阅读说明：本技术 全自动绷网机 (Full-automatic net stretching machine ) 是由 何海峰 于 2021-05-19 设计创作，主要内容包括：本发明公开了一种全自动绷网机,包括：第一夹紧装置及第二夹紧装置；第三夹紧装置及第四夹紧装置；第三主动轴及第三主动轴从动杆能够共同控制第一夹紧装置远离或者靠近底部机架的一条短边；第四主动轴及第四主动轴从动杆能够共同控制第二夹紧装置远离或者靠近底部机架的另一条短边；第二主动轴第二从动杆及第二主动轴第四从动杆能够共同控制第四夹紧装置远离或者靠近底部机架的一条长边；以及第二主动轴第三从动杆及第二主动轴第五从动杆能够共同控制第三夹紧装置远离或者靠近底部机架的另一条长边。本发明公开了一种全自动绷网机,能够通过链条传动完成四边张紧装置的自动调节,链传动适于远距离传动,在保持准确的平均传动比同时成本低廉。(The invention discloses a full-automatic net stretching machine, which comprises: a first clamping device and a second clamping device; a third clamping device and a fourth clamping device; the third driving shaft and the third driving shaft driven rod can jointly control the first clamping device to be far away from or close to one short side of the bottom rack; the fourth driving shaft and the fourth driving shaft driven rod can jointly control the second clamping device to be far away from or close to the other short side of the bottom rack; the second driving shaft second driven rod and the second driving shaft fourth driven rod can jointly control the fourth clamping device to be far away from or close to one long edge of the bottom rack; and the third driven rod of the second driving shaft and the fifth driven rod of the second driving shaft can control the third clamping device to be far away from or close to the other long edge of the bottom rack together. The invention discloses a full-automatic screen stretching machine which can complete automatic adjustment of a four-side tensioning device through chain transmission, is suitable for long-distance transmission, and has low cost while maintaining accurate average transmission ratio.)

1. A full-automatic screen stretching machine is characterized by comprising:

the bottom frame is of a rectangular frame structure;

the first clamping device and the second clamping device are arranged on the outer sides of a pair of short sides of the upper plane of the bottom rack in parallel and symmetrically;

the third clamping device and the fourth clamping device are arranged on the outer sides of a pair of long edges of the upper plane of the bottom rack in parallel and symmetrically;

the third driving shaft and the third driving shaft driven rod are parallel to each other and are arranged on one short side of the upper plane of the bottom rack in a manner of being vertical to the short side, the outer ends of the third driving shaft and the third driving shaft driven rod are vertically connected with the first clamping device, and the third driving shaft driven rod can jointly control the first clamping device to be far away from or close to the short side of the bottom rack;

the fourth driving shaft and the fourth driving shaft driven rod are parallel to each other and are arranged on the other short side of the upper plane of the bottom rack in a manner of being vertical to the other short side, the outer ends of the fourth driving shaft and the fourth driving shaft driven rod are vertically connected with the second clamping device, and the fourth driving shaft driven rod can jointly control the second clamping device to be far away from or close to the other short side of the bottom rack;

the second driving shaft second driven rod and the second driving shaft fourth driven rod are parallel to each other and are arranged on one long edge perpendicular to one long edge of the upper plane of the bottom rack, the outer ends of the second driving shaft second driven rod and the second driving shaft fourth driven rod are vertically connected with the fourth clamping device, and the second driving shaft second driven rod and the second driving shaft fourth driven rod can jointly control the fourth clamping device to be far away from or close to the one long edge of the bottom rack; and

the third driving shaft third driven rod and the fifth second driving shaft driven rod are parallel to each other and perpendicular to the other long edge of the upper plane of the bottom rack, the outer end of the third driving shaft third driven rod and the outer end of the fifth second driving shaft driven rod are perpendicularly connected with the third clamping device, and the third driving shaft third driven rod and the fifth second driving shaft driven rod can jointly control the third clamping device to be far away from or close to the other long edge of the bottom rack.

2. The fully automatic screen stretching machine according to claim 1, wherein the movement of the third clamping device away from or toward the one long side of the bottom frame and the movement of the fourth clamping device away from or toward the other long side of the bottom frame are synchronous movements.

3. The fully automatic screen stretching machine according to claim 1, further comprising:

a first sub-clamping device and a second sub-clamping device which are arranged in parallel and symmetrically on the outer sides of the pair of long sides of the upper plane of the bottom frame and are positioned on one side of the other short side close to the upper plane of the bottom frame;

the first driving shaft first driven rod is arranged on one long side perpendicular to the one long side of the upper plane of the bottom rack and positioned on one side close to the other short side of the upper plane of the bottom rack, and the outer side of the first driving shaft first driven rod is vertically connected with the first auxiliary clamping device; and

the first driving shaft second driven rod is arranged on the other long side perpendicular to the other long side of the upper plane of the bottom rack and positioned on one side close to the other short side of the bottom rack, and the outer side of the first driving shaft second driven rod is vertically connected with the second auxiliary clamping device;

the first driving shaft first driven rod can control the first auxiliary clamping device to be far away from or close to the long edge of the upper plane of the bottom rack, and the first driving shaft second driven rod can control the second auxiliary clamping device to be far away from or close to the other long edge of the upper plane of the bottom rack.

4. The fully automatic screen stretching machine according to claim 3, wherein the movement of the first secondary clamping device away from or toward the one long side of the upper plane of the bottom frame is synchronous with the movement of the second secondary clamping device away from or toward the other long side of the upper plane of the bottom frame.

5. The fully automatic screen stretching machine according to claim 3, further comprising:

the first driving shaft is arranged on the bottom rack in parallel with the first driving shaft first driven rod and the first driving shaft second driven rod and is positioned below the first driving shaft first driven rod and the first driving shaft second driven rod, and the first driving shaft drives the first driving shaft first driven rod and the first driving shaft second driven rod to synchronously rotate through chains respectively;

the second driving shaft is arranged on the bottom rack in parallel with the second driving shaft second driven rod and the second driving shaft third driven rod and is positioned below the second driving shaft second driven rod and the second driving shaft third driven rod; and

the second driving shaft first driven rod is arranged on the bottom rack in parallel with the second driving shaft fourth driven rod and the second driving shaft fifth driven rod and is positioned below the second driving shaft fourth driven rod and the second driving shaft fifth driven rod;

the second driving shaft drives the second driving shaft first driven rod, the second driving shaft second driven rod and the second driving shaft third driven rod to synchronously rotate through chains respectively, and meanwhile the second driving shaft first driven rod drives the second driving shaft fourth driven rod and the second driving shaft fifth driven rod and the second driving shaft first driven rod to synchronously rotate through chains respectively.

6. The fully automatic screen stretching machine according to claim 5, further comprising:

the first motor is arranged on the bottom rack and drives a first driving shaft through a chain;

the second motor is arranged on the bottom rack and drives the second driving shaft to rotate through a chain;

the third motor is arranged on the bottom rack and drives the third driving shaft to rotate through a chain, and meanwhile, the third driving shaft drives the third driving shaft driven rod to synchronously rotate with the third driving shaft through the chain; and

and the fourth motor is arranged on the bottom rack and drives the fourth driving shaft to rotate through a chain, and meanwhile, the fourth driving shaft drives the fourth driving shaft driven rod and the fourth driving shaft to synchronously rotate through the chain.

7. The fully automatic screen stretching machine according to claim 3, further comprising a platform assembly disposed above the upper plane of said bottom frame, said platform assembly comprising:

the platform frame is arranged above the upper plane of the bottom rack, the platform frame is of a rectangular frame structure, a pair of short edges of the platform frame are arranged in parallel with the first clamping device and the second clamping device, and a pair of long edges of the platform frame are arranged in parallel with the third clamping device and the fourth clamping device and correspond to the third clamping device and the fourth clamping device in position;

a first transverse guide shaft, a second transverse guide shaft, a third transverse guide shaft and a fourth transverse guide shaft which are parallel to each other and are arranged on the lower plane of the platform frame perpendicularly to a pair of long edges of the platform frame;

a first longitudinal guide shaft and a second longitudinal guide shaft which are arranged on the lower plane of the platform frame in parallel with each other and perpendicular to a pair of short sides of the platform frame and are positioned at the short sides of the platform frame close to the second clamping device;

the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft, the fourth transverse guide shaft, the first longitudinal guide shaft and the second longitudinal guide shaft are respectively arranged on the lower plane of the platform frame through at least two shaft supporting sleeves, and the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft, the fourth transverse guide shaft, the first longitudinal guide shaft and the second longitudinal guide shaft can respectively slide in the at least two shaft supporting sleeves;

the first outer pull rod is simultaneously connected with one ends of the first transverse guide shaft and the second transverse guide shaft, and can approach or be far away from one long edge of the platform frame in parallel through the guide of the first transverse guide shaft and the second transverse guide shaft;

the second outer pull rod is simultaneously connected with one ends of the third transverse guide shaft and the fourth transverse guide shaft, and can approach or be far away from the other long edge of the platform frame in parallel through the guide of the third transverse guide shaft and the fourth transverse guide shaft;

the third outer pull rod is simultaneously connected with one ends of the first longitudinal guide shaft and the second longitudinal guide shaft, and can be guided by the first longitudinal guide shaft and the second longitudinal guide shaft to parallelly approach or be far away from the short side of the platform frame close to the second clamping device;

a platform cover plate tiled on an upper plane of the platform frame;

the electromagnet is arranged on one surface, facing the second clamping device, of the third outer pull rod; and

a plurality of connections distributed on a lower plane of the platform frame;

the upper planes of the first outer pull rod, the second outer pull rod and the third outer pull rod are flush with the platform cover plate.

8. The fully automatic screen stretching machine according to claim 7, further comprising a lifting device comprising:

a fifth motor disposed on the bottom chassis;

a driveshaft assembly, comprising:

the fifth driving shaft is arranged below the upper plane of the bottom rack, and the fifth motor drives the fifth driving shaft to rotate through a chain; and

the fifth driven shaft and the fifth driven shaft are arranged below the upper plane of the bottom rack in parallel, and the fifth driving shaft drives the fifth driven shaft and the fifth driving shaft to synchronously rotate through a chain;

eccentric wheels provided at both ends of the fifth driving shaft and the fifth driven shaft;

one end of the linkage rod is pivoted with the edge of the eccentric wheel;

one end of the platform support rod passes through the lifting guide sleeve arranged on the bottom rack and then is fixedly connected with the connecting part of the platform frame, and the other end of the platform support rod is pivoted with the other end of the linkage rod;

and when the fifth motor drives the fifth driving shaft and the fifth driven shaft to synchronously rotate, the eccentric wheel drives the platform supporting rod to vertically move in the lifting guide sleeve through the linkage rod, and then the platform assembly is driven to vertically lift.

9. The fully automatic screen stretching machine according to claim 1, further comprising:

the transverse guide support shafts are parallel to each other and are vertically arranged on the upper plane of the bottom rack along a pair of long edges of the upper plane of the bottom rack, one end of each transverse guide support shaft penetrates through a transverse guide sleeve arranged on the upper plane of the bottom rack, the other end of each transverse guide support shaft is vertically connected with one of the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device, and each transverse guide support shaft can slide in the transverse guide sleeve along with the transverse guide support shaft when the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are translated; and

and the longitudinal guide support shafts are parallel to each other, are vertically arranged on the upper plane of the bottom rack along with a pair of short edges of the upper plane of the bottom rack and are positioned at one end close to the second clamping device, one end of each longitudinal guide support shaft penetrates through a longitudinal guide sleeve arranged on the upper plane of the bottom rack, the other end of each longitudinal guide support shaft is vertically connected with the second clamping device, and when the second clamping device translates, each longitudinal guide support shaft can slide in the longitudinal guide sleeve along with the second clamping device.

10. The fully automatic screen stretching machine according to claim 3, wherein said first clamping device, said second clamping device, said third clamping device, said fourth clamping device, said first secondary clamping device and said second secondary clamping device each comprise a plurality of clamping heads, each of said clamping heads comprising a pneumatic locking device, said first clamping device, said second clamping device, said third clamping device, said fourth clamping device, said first secondary clamping device and said second secondary clamping device further comprising:

a fixed collet disposed below the plurality of pneumatic locking devices; and

the pressing chuck is arranged between the plurality of pneumatic locking devices and the fixed chuck, and pressing teeth which are matched with each other are arranged on the opposite planes of the pressing chuck and the fixed chuck;

the pneumatic locking devices at two ends of the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are connected with the upper planes at two ends of the pressing chuck through bolts.

Technical Field

The invention relates to the field of screen printing plate making auxiliary equipment, in particular to a full-automatic screen stretching machine suitable for screen printing plate making of different sizes.

Background

The screen stretching machine is an auxiliary device for screen printing plate making, and is used for stretching a screen on a screen frame with certain tension, the screen stretching is a primary process for realizing the screen printing plate making, and the quality of the screen stretching is related to the plate making and printing quality.

Prior art screen stretching machines generally suffer from the following technical drawbacks:

1. the clamp of the traditional large-size mechanical screen stretching machine is limited by the four-side cross arm, so that the problems of large tension of the four sides and small tension of the middle part exist, and the phenomenon that ink can not return to the initial position when ink returns can occur during printing of the stretched screen printing plate, so that the condition that printing cannot be performed is caused; in the large-size pneumatic screen stretching machine, the middle parts of the four sides of the screen frame are pressed by the clamp, and the inward contraction amplitude of the screen frame is larger than that of the four ends of the screen frame, so that the four sides of the screen frame form an inner arched arc shape;

2. the inclined tightening is a necessary means for manufacturing a precise screen printing plate, the existing inclined tightening method is to place a screen frame at a certain angle on an equipment platform, a silk screen is placed vertically, and the inclined tightening method wastes more than 20% of the silk screen

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a full-automatic screen stretching machine which can complete automatic adjustment of a four-side tensioning device through chain transmission, is suitable for long-distance transmission in a chain transmission mode, and has low cost and low requirement on a working environment while maintaining an accurate average transmission ratio.

In order to achieve the above object, the present invention provides a full-automatic screen stretching machine, comprising: a bottom frame in a rectangular frame structure; the first clamping device and the second clamping device are arranged on the outer sides of a pair of short sides of the upper plane of the bottom rack in parallel and symmetrically; the third clamping device and the fourth clamping device are arranged on the outer sides of the pair of long edges of the upper plane of the bottom rack in parallel and symmetrically; a third driving shaft and a third driving shaft driven rod which are parallel to each other and are perpendicular to one short side of the upper plane of the bottom rack are arranged on one short side, the outer ends of the third driving shaft and the third driving shaft driven rod are perpendicularly connected with the first clamping device, and the third driving shaft driven rod can jointly control the first clamping device to be far away from or close to one short side of the bottom rack; the other short side of the other short side, which is parallel to each other and vertical to the upper plane of the bottom rack, is provided with a fourth driving shaft and a fourth driving shaft driven rod on the other short side, the outer ends of the fourth driving shaft and the fourth driving shaft driven rod are vertically connected with a second clamping device, and the fourth driving shaft driven rod can jointly control the second clamping device to be far away from or close to the other short side of the bottom rack; the second driving shaft second driven rod and the second driving shaft fourth driven rod are arranged on one long edge in parallel and perpendicular to one long edge of the upper plane of the bottom rack, the outer ends of the second driving shaft second driven rod and the second driving shaft fourth driven rod are vertically connected with the fourth clamping device, and the second driving shaft second driven rod and the second driving shaft fourth driven rod can jointly control the third clamping device to be far away from or close to one long edge of the bottom rack; and a third driven rod of the second driving shaft and a fifth driven rod of the second driving shaft which are parallel to each other and are perpendicular to the other long edge of the upper plane of the bottom rack are arranged on the other long edge, the outer ends of the third driven rod of the second driving shaft and the fifth driven rod of the second driving shaft are perpendicularly connected with a third clamping device, and the third driven rod of the second driving shaft and the fifth driven rod of the second driving shaft can jointly control the fourth clamping device to be far away from or close to the other long edge of the bottom rack.

In a preferred embodiment, the movement of the third clamping means away from or towards one long side of the bottom chassis is synchronized with the movement of the fourth clamping means away from or towards the other long side of the bottom chassis.

In a preferred embodiment, the fully automatic screen stretching machine further comprises: the first auxiliary clamping device and the second auxiliary clamping device are arranged on the outer sides of a pair of long edges of the upper plane of the bottom rack in parallel and symmetrically and are positioned on one side of the other short edge of the upper plane of the bottom rack; the first driving shaft first driven rod is arranged on one long side perpendicular to one long side of the upper plane of the bottom rack and positioned on one side of the other short side close to the upper plane of the bottom rack, and the outer side of the first driving shaft first driven rod is vertically connected with the first auxiliary clamping device; the other long side perpendicular to the upper plane of the bottom rack is arranged on the other long side and is positioned on one side close to the other short side of the bottom rack, and the outer side of the second driven rod of the first driving shaft is vertically connected with the second auxiliary clamping device; the first driving shaft and the first driven rod can control the first auxiliary clamping device to be far away from or close to one long edge of the upper plane of the bottom rack, and the second driving shaft and the second driven rod can control the second auxiliary clamping device to be far away from or close to the other long edge of the upper plane of the bottom rack.

In a preferred embodiment, the movement of the first sub-clamping means away from or towards one long side of the upper plane of the bottom chassis is synchronized with the movement of the second sub-clamping means away from or towards the other long side of the upper plane of the bottom chassis.

In a preferred embodiment, the fully automatic screen stretching machine further comprises: the first driving shaft, a first driving shaft first driven rod and a first driving shaft second driven rod are arranged on the bottom rack in parallel and are positioned below the first driving shaft first driven rod and the first driving shaft second driven rod, and the first driving shaft drives the first driving shaft first driven rod and the first driving shaft second driven rod to synchronously rotate through chains respectively; the second driving shaft, a second driving shaft second driven rod and a second driving shaft third driven rod are arranged on the bottom rack in parallel and are positioned below the second driving shaft second driven rod and the second driving shaft third driven rod; the second driving shaft first driven rod, the second driving shaft fourth driven rod and the second driving shaft fifth driven rod are arranged on the bottom rack in parallel and are positioned below the second driving shaft fourth driven rod and the second driving shaft fifth driven rod; the second driving shaft drives a second driving shaft first driven rod, a second driving shaft second driven rod and a second driving shaft third driven rod to synchronously rotate through chains respectively, and meanwhile, the second driving shaft first driven rod drives a second driving shaft fourth driven rod and a second driving shaft fifth driven rod to synchronously rotate with the second driving shaft first driven rod through chains respectively.

In a preferred embodiment, the fully automatic screen stretching machine further comprises: the first motor is arranged on the bottom rack and drives the first driving shaft through a chain; the second motor is arranged on the bottom rack and drives the second driving shaft to rotate through a chain; the third motor is arranged on the bottom rack and drives a third driving shaft to rotate through a chain, and meanwhile, the third driving shaft drives a third driving shaft driven rod to synchronously rotate with the third driving shaft through the chain; and the fourth motor is arranged on the bottom rack, the fourth motor drives the fourth driving shaft to rotate through a chain, and meanwhile, the fourth driving shaft drives the fourth driving shaft driven rod to synchronously rotate with the fourth driving shaft through the chain.

In a preferred embodiment, the fully automatic screen stretching machine further comprises a platform assembly, which is arranged above the upper plane of the bottom frame, and the platform assembly comprises: the platform frame is arranged above the upper plane of the bottom rack, the platform frame is of a rectangular frame structure, a pair of short edges of the platform frame are arranged in parallel with the first clamping device and the second clamping device, and a pair of long edges of the platform frame are arranged in parallel with the third clamping device and the fourth clamping device and correspond to the third clamping device and the fourth clamping device in position; the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft and the fourth transverse guide shaft are parallel to each other and are arranged on the lower plane of the platform frame in a manner of being vertical to a pair of long edges of the platform frame; the first longitudinal guide shaft and the second longitudinal guide shaft are parallel to each other and are arranged on the lower plane of the platform frame in a manner of being vertical to a pair of short edges of the platform frame, and are positioned at the short edges of the platform frame close to the second clamping device; the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft, the fourth transverse guide shaft, the first longitudinal guide shaft and the second longitudinal guide shaft are respectively arranged on the lower plane of the platform frame through at least two shaft supporting sleeves, and the first transverse guide shaft, the second transverse guide shaft, the third transverse guide shaft, the fourth transverse guide shaft, the first longitudinal guide shaft and the second longitudinal guide shaft can respectively slide in the at least two shaft supporting sleeves; the first outer pull rod is connected with one end of the first transverse guide shaft and one end of the second transverse guide shaft at the same time, and the first outer pull rod can approach or be far away from one long edge of the platform frame in parallel through the guide of the first transverse guide shaft and the second transverse guide shaft; the second outer pull rod is connected with one ends of the third transverse guide shaft and the fourth transverse guide shaft at the same time, and the second outer pull rod can approach or be far away from the other long edge of the platform frame in parallel through the guide of the third transverse guide shaft and the fourth transverse guide shaft; the third outer pull rod is connected with one end of the first longitudinal guide shaft and one end of the second longitudinal guide shaft at the same time, and the third outer pull rod can approach or be far away from the short side of the platform frame close to the second clamping device in parallel through the guide of the first longitudinal guide shaft and the second longitudinal guide shaft; the platform cover plate is flatly laid on the upper plane of the platform frame; the electromagnet is arranged on one surface of the third outer pull rod facing the second clamping device; and a plurality of connecting portions distributed on a lower plane of the platform frame; the upper planes of the first outer pull rod, the second outer pull rod and the third outer pull rod are flush with the platform cover plate.

In a preferred embodiment, the fully automatic screen stretching machine further comprises a lifting device, which comprises: the fifth motor is arranged on the bottom rack; the lifting device comprises a transmission shaft assembly consisting of a fifth driving shaft and a fifth driven shaft. The fifth driving shaft is arranged below the upper plane of the bottom rack, and the fifth motor drives the fifth driving shaft to rotate through a chain. The fifth driven shaft and the fifth driven shaft are arranged below the upper plane of the bottom rack in parallel, and the fifth driving shaft drives the fifth driven shaft and the fifth driving shaft to synchronously rotate through a chain. The eccentric wheels are arranged at two ends of the fifth driving shaft and the fifth driven shaft. One end of the linkage rod is pivoted with the edge of the eccentric wheel 502. One end of the platform support rod passes through the lifting guide sleeve arranged on the bottom rack and then is fixedly connected with the connecting part of the platform frame, and the other end of the platform support rod is pivoted with the other end of the linkage rod; when the fifth motor drives the fifth driving shaft and the fifth driven shaft to synchronously rotate, the eccentric wheel drives the platform supporting rod to vertically move in the lifting guide sleeve through the linkage rod, and then the platform assembly is driven to vertically lift.

In a preferred embodiment, the full-automatic screen stretching machine further comprises a plurality of transverse guide support shafts and a plurality of longitudinal guide support shafts; the plurality of transverse guiding support shafts are parallel to each other and are vertically arranged on the upper plane of the bottom rack with a pair of long edges of the upper plane of the bottom rack, one end of each transverse guiding support shaft penetrates through a transverse guiding sleeve arranged on the upper plane of the bottom rack, the other end of each transverse guiding support shaft is vertically connected with one of a third clamping device, a fourth clamping device, a first auxiliary clamping device and a second auxiliary clamping device, and when the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are translated, each transverse guiding support shaft can slide in the transverse guiding sleeve along with the transverse guiding support shaft; the plurality of longitudinal guide support shafts are parallel to each other and are vertically arranged on the upper plane of the bottom rack with a pair of short edges of the upper plane of the bottom rack and are positioned at one end close to the second clamping device, one end of each longitudinal guide support shaft penetrates through the longitudinal guide sleeve arranged on the upper plane of the bottom rack, the other end of each longitudinal guide support shaft is vertically connected with the second clamping device, and when the second clamping device translates, each longitudinal guide support shaft can slide in the longitudinal guide sleeve along with the second clamping device.

In a preferred embodiment, the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first sub-clamping device and the second sub-clamping device each comprise a plurality of clamping heads, each clamping head comprises a pneumatic locking device, and the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first sub-clamping device and the second sub-clamping device further comprise a fixed chuck and a pressing chuck; the fixed chucks are arranged below the plurality of pneumatic locking devices; the pressing chuck is arranged between the plurality of pneumatic locking devices and the fixed chuck, and mutually matched pressing teeth are arranged on the opposite planes of the pressing chuck and the fixed chuck; the pneumatic locking devices at two ends of the first clamping device, the second clamping device, the third clamping device, the fourth clamping device, the first auxiliary clamping device and the second auxiliary clamping device are connected with the upper planes at two ends of the pressing chuck through bolts.

Compared with the prior art, the full-automatic net stretching machine has the following beneficial effects:

1. the full-automatic net stretching machine adopts a mode of combining chain transmission and screw rod transmission to realize the adjustment of the four-side tensioning device; the chain transmission mode is suitable for long-distance transmission, the cost is low while the accurate average transmission ratio is kept, and the requirement on the working environment is low;

2. the transverse long edge tensioning device is divided into two parts, can be independently tensioned and adjusted, and is respectively suitable for manufacturing large-scale screen printing plates and small-scale screen printing plates; the three modes can be adjusted simultaneously, and are suitable for manufacturing the screen printing plates with different sizes;

3. the longitudinal short edge tensioning devices are respectively controlled by two motors, and tensioning parameters can be adjusted according to the net stretching requirements;

4. the tensioning devices on the two transverse sides of the full-automatic screen stretching machine are provided with four groups of guide supporting shafts, and the tensioning device on the short side is provided with two groups of guide supporting shafts (2-8 groups of supporting shafts can be arranged on the full-automatic screen stretching machine according to the size of a produced screen plate), so that the tensioning device is further prevented from being bent and deformed;

5. the platform and the tensioning device of the full-automatic screen stretching machine are respectively provided with an electromagnet, and the auxiliary platform moves to the tensioning device at the side, so that the screen stretching area is enlarged, and manual dragging is replaced;

6. the tensioning device of the full-automatic screen stretching machine is provided with the distance sensor, can transmit the displacement back to the controller in real time, is driven by the servo motor or the asynchronous motor, is matched with the encoder to realize the displacement control of the tensioning device, only needs to manually input tensioning parameters, automatically controls the screen stretching process, and can realize full-automatic screen stretching;

7. the bottom of the working platform of the full-automatic screen stretching machine is provided with 6 groups of platform supporting shafts but not limited to 6 groups, so that the platform is prevented from deforming and the levelness of a screen frame is prevented from being influenced.

Drawings

FIG. 1 is a schematic perspective view of a fully automatic screen stretching machine according to one embodiment of the present invention;

FIG. 2 is a schematic front view of a fully automatic screen stretcher according to an embodiment of the invention;

FIG. 3 is a schematic top view of a fully automatic screen stretcher according to an embodiment of the invention;

FIG. 4 is a schematic top view of a fully automatic screen stretcher according to an embodiment of the invention;

FIG. 5 is a schematic rear view of a fully automatic screen stretcher according to an embodiment of the invention;

FIG. 6 is a schematic right view of a fully automatic screen stretcher according to an embodiment of the invention;

FIG. 7 is a schematic left side view of a fully automatic screen stretcher according to an embodiment of the invention;

FIG. 8 is a schematic cross-sectional view of a third drive shaft according to an embodiment of the present invention;

FIG. 9 is a schematic bottom view of a platform frame according to an embodiment of the invention;

FIG. 10 is a schematic structural view of a lifting device according to an embodiment of the present invention;

FIG. 11 is an enlarged partial schematic view of a clamping device according to an embodiment of the present invention;

FIG. 12 is an enlarged partial schematic view at A of FIG. 4;

FIG. 13 is a schematic structural view of a first drive shaft according to an embodiment of the present invention;

FIG. 14 is a schematic structural view of a secondary drive shaft according to an embodiment of the present invention;

fig. 15 is a schematic structural view of a second driving shaft first driven lever according to an embodiment of the present invention.

Description of the main reference numerals:

1-a first electric machine; 101-a first drive shaft; 102-a first driving shaft and a first driven rod; 103-a first driving shaft and a second driven rod; 2-a second motor; 201-a second driving shaft; 202-a second driving shaft and a first driven rod; 203-a second driving shaft and a second driven rod; 204-a second driving shaft and a third driven rod; 205-second driving shaft fourth driven rod; 206-a fifth driven rod of the second driving shaft; 3-a third motor; 301-a third drive shaft; 3011-a sprocket; 3012-lead screw; 3013-a bearing; 3014-a sleeve; 3015-thread sleeve; 302-third drive shaft driven lever; 4-a fourth motor; 401-fourth drive shaft; 402 a fourth drive shaft driven lever; 5-a fifth motor; 501-a drive shaft assembly; 502-eccentric wheel; 503-platform support rods; 504-trace; 601-transverse guide support shaft; 602-longitudinal guiding support shaft; 701-a first clamping device; 702-a second clamping device; 703-a third clamping means; 704-a fourth clamping device; 705-a first secondary clamping means; 706-a second set of clamping means; 707-an electromagnet; 708-a fixed collet; 709-compressing the collet; 710-a pneumatic locking device; 8-platform assembly, 801-platform frame; an 802-trunnion sleeve; 8021-a first transverse guide shaft, 8022-a second transverse guide shaft; 8023-a third transverse guide shaft; 8024-a fourth transverse guide shaft; 8025-a first longitudinal guide shaft; 8026-a second longitudinal guide shaft; 803-platform cover plate; 804-an electromagnet; 805-a first outer tie rod; 806-a second outer tie rod; 807-a third outer tie rod; 808-a connecting part; 9-a bottom frame; 10-an electrical box; 11-a baffle plate; 12-ground feet; 13-a caster; 14-lifting guide sleeve.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1 to 7, a fully automatic net stretching machine according to a preferred embodiment of the present invention includes: a bottom frame 9 in a rectangular frame structure. Baffles 11 are arranged around the bottom frame 9, and the four corners and the middle part of the lower plane are provided with feet 12 and casters 13 which can adjust the height. A first clamping device 701 and a second clamping device 702 which are arranged in parallel and symmetrically on the outer side of a pair of short sides of the upper plane of the bottom frame 9. And a third clamping device 703 and a fourth clamping device 704 which are arranged in parallel and symmetrically on the outer sides of the pair of long sides of the upper plane of the bottom frame 9. The third driving shaft 301 and the third driving shaft driven rod 302 are arranged on one short side and parallel to each other and perpendicular to one short side of the upper plane of the bottom rack 9, the outer ends of the third driving shaft 301 and the third driving shaft driven rod 302 are perpendicularly connected with the first clamping device 701, and the third driving shaft 301 and the third driving shaft driven rod 302 can jointly control the first clamping device 701 to be far away from or close to one short side of the bottom rack 9. A fourth driving shaft 401 and a fourth driving shaft driven rod 402 which are parallel to each other and are perpendicular to the other short side of the upper plane of the bottom frame 9 are arranged on the other short side, the outer ends of the fourth driving shaft 401 and the fourth driving shaft driven rod 402 are perpendicularly connected with a second clamping device 702, and the fourth driving shaft 401 and the fourth driving shaft driven rod 402 can jointly control the second clamping device 702 to be far away from or close to the other short side of the bottom frame 9. The second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205 are arranged on one long edge in parallel and perpendicular to one long edge of the upper plane of the bottom rack 9, the outer ends of the second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205 are perpendicularly connected with the third clamping device 703, and the second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205 can control the third clamping device 703 to be far away from or close to one long edge of the bottom rack 9 together. And a second driving shaft third driven rod 204 and a second driving shaft fifth driven rod 206 which are parallel to each other and are arranged on the other long side of the upper plane of the bottom frame 9 in a manner of being perpendicular to the other long side, the outer ends of the second driving shaft third driven rod 204 and the second driving shaft fifth driven rod 206 are perpendicularly connected with a fourth clamping device 704, and the second driving shaft third driven rod 204 and the second driving shaft fifth driven rod 206 can jointly control the fourth clamping device 704 to be far away from or close to the other long side of the bottom frame 9.

In some embodiments, the movement of the third clamping device 703 away from or toward one long side of the bottom chassis 9 is synchronized with the movement of the fourth clamping device 704 away from or toward the other long side of the bottom chassis 9. That is, the third clamping device 703 and the fourth clamping device 704 are either simultaneously remote or simultaneously close.

In some embodiments, the fully automatic screen stretching machine further comprises: and a first sub-clamping means 705 and a second sub-clamping means 706 which are disposed in parallel and symmetrically with each other outside a pair of long sides of the upper plane of the bottom chassis 9 and are located on a side close to the other short side of the upper plane of the bottom chassis 9. And a first driving shaft first driven rod 102 which is arranged on one long side perpendicular to one long side of the upper plane of the bottom frame 9 and is positioned on one side close to the other short side of the upper plane of the bottom frame 9, wherein the outer side of the first driving shaft first driven rod 102 is vertically connected with a first auxiliary clamping device 705. And a first driving shaft second driven rod 103 which is arranged on the other long side and is vertical to the other long side of the upper plane of the bottom frame 9 and is positioned at one side close to the other short side of the bottom frame 9, wherein the outer side of the first driving shaft second driven rod 103 is vertically connected with the second auxiliary clamping device 706. Wherein the first driving shaft first driven lever 102 can control the first sub-clamping means 705 to move away from or close to one long side of the upper plane of the bottom chassis 9, and the first driving shaft second driven lever 103 can control the second sub-clamping means 706 to move away from or close to the other long side of the upper plane of the bottom chassis 9.

In some embodiments, the movement of the first secondary clamping means 705 away from or towards one long side of the upper plane of the bottom housing 9 is synchronized with the movement of the second secondary clamping means 706 away from or towards the other long side of the upper plane of the bottom housing 9. That is to say the first 705 and second 706 secondary clamping means act as the third 703 and fourth 704 clamping means either simultaneously away or simultaneously towards each other. The action of the first 705 and second 706 secondary clamping means may be synchronized with the action of the third 703 and fourth 704 clamping means, either by the first 705 and second 706 secondary clamping means acting alone or by the third 703 and fourth 704 clamping means acting alone.

In some embodiments, the fully automatic screen stretching machine further comprises: the first driving shaft 101, a first driving shaft first driven rod 102 and a first driving shaft second driven rod 103 are arranged on the bottom rack 9 in parallel and located below the first driving shaft first driven rod 102 and the first driving shaft second driven rod 103, and the first driving shaft 101 drives the first driving shaft first driven rod 102 and the first driving shaft second driven rod 103 to rotate synchronously through chains respectively. The second driving shaft 201 is disposed on the bottom frame 9 in parallel with the second driving shaft second driven lever 203 and the second driving shaft third driven lever 204, and is located below the second driving shaft second driven lever 203 and the second driving shaft third driven lever 204. And the second master shaft first driven lever 202 is provided on the bottom frame 9 in parallel with the second master shaft fourth driven lever 205 and the second master shaft fifth driven lever 206, and is located below the second master shaft fourth driven lever 205 and the second master shaft fifth driven lever 206. The second driving shaft 201 drives the second driving shaft first driven rod 202, the second driving shaft second driven rod 203 and the second driving shaft third driven rod 204 to synchronously rotate through chains respectively, and meanwhile, the second driving shaft first driven rod 202 drives the second driving shaft fourth driven rod 205 and the second driving shaft fifth driven rod 206 and the second driving shaft first driven rod 202 to synchronously rotate through chains respectively.

In some embodiments, the fully automatic screen stretching machine further comprises: the first motor 1 is arranged on the bottom rack 9, and the first motor 1 drives the second driving shaft and the first driven rod 202 to rotate through a chain. The second motor 2 is arranged on the bottom frame 9, and the second motor 2 drives the second driving shaft 201 to rotate through a chain. The third motor 3 is arranged on the bottom rack 9, the third motor 3 drives the third driving shaft 301 to rotate through a chain, and meanwhile, the third driving shaft 301 drives the third driving shaft driven rod 302 and the third driving shaft 301 to synchronously rotate through the chain. And the fourth motor 4 is arranged on the bottom frame 9, the fourth motor 4 drives the fourth driving shaft 401 to rotate through a chain, and simultaneously the fourth driving shaft 401 drives the fourth driving shaft driven rod 402 to synchronously rotate with the fourth driving shaft 401 through the chain.

As shown in fig. 8, fig. 8 is a sectional view of a third driving shaft according to an embodiment of the present invention. In the present embodiment, the first master shaft first driven lever 102 and the first master shaft second driven lever 103, the second master shaft 201 first driven lever, the second master shaft second driven lever 203, the second master shaft third driven lever 204, the second master shaft fourth driven lever 205, and the second master shaft fifth driven lever 206. The transmission structure and the transmission principle of the third driving shaft 301 and the third driving shaft driven rod 302, and the fourth driving shaft 401 and the fourth driving shaft driven rod 402 are all basically similar, taking the third driving shaft 301 of this embodiment as an example, generally, the lead screw 3012 is driven by the chain and the chain wheel 3011 to rotate in the sleeve 3014, the sleeve 3014 is fixed on the bottom frame 9, and the lead screw 3012 limits the axial movement of the lead screw 3012 through the bearing 3013 and the shoulder of the lead screw 3012. One section of the lead screw 3012 is matched with the screw sleeve 3015, when the lead screw 3012 rotates, since the lead screw 3012 is locked by axial movement, the screw sleeve 3015 moves on the lead screw 3012, the outer diameter of the screw sleeve 3015 matches the inner diameter of the sleeve 3014, so that the lead screw 3012 rotates to drive the screw sleeve 3015 to move in the sleeve 3014, and the other end of the screw sleeve 3015 is vertically connected with the clamping device, so that the clamping device can translate along with the rotation of the lead screw 3012. However, the present invention is not limited thereto, and other mechanisms that can realize rotation and linear movement can be used.

Referring to fig. 1 to 8, in some embodiments, the fully automatic screen stretching machine further includes a plurality of transverse guide support shafts 601 and a plurality of longitudinal guide support shafts 602. A plurality of transverse guiding support shafts 601 are parallel to each other and are vertically arranged on the upper plane of the bottom frame 9 with a pair of long edges of the upper plane of the bottom frame 9, one end of each transverse guiding support shaft 601 is arranged in a transverse guiding sleeve arranged on the upper plane of the bottom frame 9 in a penetrating way, the other end of each transverse guiding support shaft 601 is vertically connected with one of the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706, and when the third clamping device 703, the fourth clamping device 704, the first auxiliary clamping device 705 and the second auxiliary clamping device 706 are translated, each transverse guiding support shaft 601 can slide in the transverse guiding sleeve along with the transverse guiding support shaft. A plurality of longitudinal guide support shafts 602 are parallel to each other and are arranged on the upper plane of the bottom rack 9 perpendicularly to a pair of short sides of the upper plane of the bottom rack 9 and located at one end close to the second clamping device 702, one end of each longitudinal guide support shaft 602 penetrates through a longitudinal guide sleeve arranged on the upper plane of the bottom rack 9, the other end of each longitudinal guide support shaft 602 is perpendicularly connected with the second clamping device 702, and when the second clamping device 702 translates, each longitudinal guide support shaft 602 can slide in the longitudinal guide sleeve along with the second clamping device 702. The plurality of transverse guide support shafts 601 and the plurality of longitudinal guide support shafts 602 can mainly play a role in supporting the clamping device, so that the situation that the middle part of the clamping device is bent and deformed due to overlong length is avoided.

As shown in fig. 9, in some embodiments, the fully automatic screen stretching machine further comprises a platform assembly 8 disposed above the upper plane of the bottom frame 9, the platform assembly 8 comprising: the platform frame 801 is arranged above the upper plane of the bottom frame 9, the platform frame 801 is in a rectangular frame structure, a pair of short sides of the platform frame 801 are arranged in parallel with the first clamping device 701 and the second clamping device 702, a pair of long sides of the platform frame 801 are arranged in parallel with the third clamping device 703 and the fourth clamping device 704, and the positions of the long sides correspond to those of the third clamping device 703 and the fourth clamping device 704. The first lateral guide shaft 8021, the second lateral guide shaft 8022, the third lateral guide shaft 8023, and the fourth lateral guide shaft 8024 are disposed on the lower plane of the platform frame 801 in parallel to each other and perpendicular to a pair of long sides of the platform frame 801. The first and second longitudinal guide shafts 8025 and 8026 are arranged on the lower plane of the platform frame 801 parallel to each other and perpendicular to a pair of short sides of the platform frame 801 and at short sides of the platform frame 801 near the second clamping means 702. The first transverse guide shaft 8021, the second transverse guide shaft 8022, the third transverse guide shaft 8023, the fourth transverse guide shaft 8024, and the first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026 are respectively disposed on the lower plane of the platform frame 801 by at least two boss sleeves 802, and the first transverse guide shaft 8021, the second transverse guide shaft 8022, the third transverse guide shaft 8023, the fourth transverse guide shaft 8024, and the first longitudinal guide shaft 8025 and the second longitudinal guide shaft 8026 are respectively slidable on the at least two boss sleeves 802. The first outer tension bar 805 is connected to one end of the first transverse guide shaft 8021 and one end of the second transverse guide shaft 8022, and the first outer tension bar 805 can approach or separate from one long side of the platform frame 801 in parallel by being guided by the first transverse guide shaft 8021 and the second transverse guide shaft 8022. The second outer link 806 is connected to one end of the third transversal guide shaft 8023 and the fourth transversal guide shaft 8024, and the second outer link 806 can be guided by the third transversal guide shaft 8023 and the fourth transversal guide shaft 8024 to approach or separate from the other long side of the platform frame 801 in parallel. The third outer tie rod 807 is connected to one end of both the first and second longitudinal guide shafts 8025 and 8026, and the third outer tie rod 807 can be guided by the first and second longitudinal guide shafts 8025 and 8026 to be parallel close to or away from the short side of the platform frame 801 close to the second clamping device 702. The platform cover plate 803 is laid flat on the upper plane of the platform frame 801. The electromagnet 804 is arranged on the side of the third outer tension rod 807 facing the second clamping device 702. And a plurality of connecting portions 808 distributed on a lower plane of the platform frame 801. The upper planes of the first outer tie bar 805, the second outer tie bar 806 and the third outer tie bar 807 are flush with the platform cover plate 803.

In some embodiments, the platform assembly 8 is configured to carry and lift the screen frame, and when the screen is stretched to a predetermined level, the platform assembly 8 lifts the screen frame upward after the screen is stretched, and the upper surface of the screen frame is attached to the screen frame, and then the screen frame is glued to the screen frame along the plane of the screen frame. The first outer pull rod 805, the second outer pull rod 806 and the third outer pull rod 807 can be pulled out appropriately according to different specifications of the screen frame, so as to assist the lifting of the screen frame to be more stable.

In some embodiments, the fully automatic screen stretching machine further comprises a lifting device, which comprises: a fifth motor 5 arranged on the bottom frame 9. The lifting device includes a transmission shaft assembly 501 composed of a fifth driving shaft and a fifth driven shaft. The fifth driving shaft is arranged below the upper plane of the bottom rack 9, and the fifth motor 5 drives the fifth driving shaft to rotate through a chain. The fifth driven shaft and the fifth driven shaft are arranged below the upper plane of the bottom rack 9 in parallel, and the fifth driving shaft drives the fifth driven shaft and the fifth driving shaft to synchronously rotate through a chain. Eccentric wheels 502 are provided at both ends of the fifth driving shaft and the fifth driven shaft. One end of linkage 504 is pivoted with the edge of eccentric 502. One end of the platform support rod 503 passes through the lifting guide sleeve arranged on the bottom rack 9 and then is fixedly connected with the connecting part 808 of the platform frame 801, and the other end is pivoted with the other end of the linkage rod 504. While the fifth motor 5 drives the fifth driving shaft and the fifth driven shaft to rotate synchronously, the eccentric wheel 502 drives the platform supporting rod 503 to move vertically in the lifting guide sleeve through the linkage 504, and further drives the platform assembly 8 to lift vertically.

As shown in fig. 11, and referring to fig. 1-8, in some embodiments, the first clamping device 701, the second clamping device 702, the third clamping device 703, the fourth clamping device 704, the first sub-clamping device 705, and the second sub-clamping device 706 each include a plurality of clamping heads, each of which includes a pneumatic locking device 710 (such as, but not limited to, an air cylinder), and the first clamping device 701, the second clamping device 702, the third clamping device 703, the fourth clamping device 704, the first sub-clamping device 705, and the second sub-clamping device 706 further include a fixed collet 708 and a compression collet 709. The fixed collet 708 is disposed below a plurality of pneumatic locking devices 710. The compressing collet 709 is disposed between the pneumatic locking devices 710 and the fixed collet 708, and compressing teeth matched with each other are disposed on opposite planes of the compressing collet 709 and the fixed collet 708. In which pneumatic locking means 710 located at both ends of a first clamping means 701, a second clamping means 702, a third clamping means 703, a fourth clamping means 704, a first sub-clamping means 705, and a second sub-clamping means 706 are coupled to upper planes at both ends of a pressing jaw 709 by bolts.

Referring to fig. 12 to 15 and fig. 1 to 8, in some embodiments, the transmission of the fully automatic screen stretching machine of the present invention mainly depends on the transmission of a sprocket and a chain, and is driven by a motor, and the chain transmission mode is suitable for long-distance transmission, and has low cost and low requirement on the working environment while maintaining an accurate average transmission ratio. Other forms of transmission may be employed as well, such as, but not limited to, toothed belts and the like.

Referring to fig. 1, in some embodiments, the fully automatic screen stretching machine of the present invention further includes an electrical box 10 disposed at any position around the bottom frame 9 for convenient operation and observation. The electrical box 10 controls the action of each motor and receives information fed back by the sensors.

In some embodiments, each clamping device of the fully automatic screen stretching machine of the present invention is equipped with a distance sensor, which can transmit the displacement back to the controller (disposed in the electrical box 10) in real time, and is driven by a servo motor or an asynchronous motor, and cooperates with an encoder to control the displacement of the clamping device, and only needs to manually input the tensioning parameters, and the screen stretching process is automatically controlled, so that the fully automatic screen stretching can be realized.

In some embodiments, the periphery of the full-automatic screen stretching machine is provided with the operation pedal, and the operation pedal assists in gluing operation, so that an inaccessible place is avoided during long-distance operation.

In some embodiments, the pneumatic locking devices 710 on both sides of the long transverse side of the fully automatic screen stretching machine also have an automatic angle releasing function, and compared with the pneumatic locking devices 710 at other positions, the pneumatic locking devices 710 at the other positions have a delay function in the action process, so that the screen is prevented from being damaged due to excessive corner tension.

In some embodiments, the operation method of the fully automatic screen stretching machine of the invention is as follows:

firstly, a screen frame is placed on a working platform (a platform component 8), and the screen frame is not in contact with a silk screen;

the four sides of the screen are extended into the gripping means (comprising a first 701, a second 702, a third 703, a fourth 704, a first 705 and a second 706 sub-gripping means) and the pressing down of the jaws of the gripping means is controlled by means of a pneumatic cylinder to grip the screen.

According to the stretching parameters input into the controller of the electric box 10 in advance, the four-side cross beams automatically move outwards to stretch the silk screen, after the tension of the silk screen fed back by the distance sensor or the tension sensor reaches the required tension, the lifting device lifts the platform assembly 8 to enable the screen frame to be attached to the silk screen tightly and glue is coated, the silk screen is adhered to the screen frame, the redundant silk screens on the four sides are cut off after the glue is dried, the silk screen on the adhered frame with the tension on the screen frame is left, and the screen stretching process is completed. The whole net stretching process is automatically controlled by a controller.

The operation method of the full-automatic screen stretching machine further comprises a large-area platform working mode and a small-area platform working mode.

The working mode of the large-area platform is as follows:

1. after the silk screen extends into the clamping device, all the jaws on the four sides are pressed down to fix the silk screen;

2. the first clamping device 701 moves outwards through the screw transmission of the third driving shaft 301 and the third driving shaft driven rod 302, and the second clamping device 702 moves outwards through the screw transmission of the fourth driving shaft 401 and the fourth driving shaft driven rod 402, so that the Y-direction (longitudinal) net stretching is completed;

3. the third clamping device 703 moves outwards through the screw transmission of the third driven rod 204 of the second driving shaft and the fifth driven rod 206 of the second driving shaft, and the first auxiliary clamping device 705 moves outwards through the screw transmission of the first driven rod 102 of the first driving shaft, so that the third clamping device and the first auxiliary clamping device move synchronously. The fourth clamping device 704 moves outwards through the screw transmission of the second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205, the second auxiliary clamping device 706 moves outwards through the screw transmission of the first driving shaft second driven rod 103, and the first auxiliary clamping device and the second auxiliary clamping device also move synchronously; the X-direction (transverse) net stretching is completed through the actions;

4. when the large-scale screen frame is stretched, because the area of the platform is limited, the square pipes at the outer edges of the three sides of the platform frame 801 can be stretched outwards through the supporting shafts at the bottom of the platform, and the effect of supporting the screen frame is achieved;

5. the magnets on the outer edge of the third outer pull rod 807 assist in attracting the second clamping device 702, and because the length of the extended side outer frame is relatively long, the attraction can ensure stability.

The small-area platform working mode is as follows:

1. after the silk screen extends into the clamping device, all the jaws on the four sides are pressed down to fix the silk screen;

2. the first secondary gripping means 705 and the second secondary gripping means 706 are simultaneously withdrawn, the second gripping means 702 are moved inwards close to the third outer tie rod 807, the working surface is adjusted smaller;

3. the first clamping device 701 moves outwards through the screw transmission of the third driving shaft 301 and the third driving shaft driven rod 302, and the second clamping device 702 moves outwards through the screw transmission of the fourth driving shaft 401 and the fourth driving shaft driven rod 402, so that the Y-direction (longitudinal) net stretching is completed;

3. the third clamping device 703 moves outwards through the screw transmission of the third driven rod 204 of the second driving shaft and the fifth driven rod 206 of the second driving shaft; the fourth clamping device 704 moves outwards through the screw transmission of the second driving shaft second driven rod 203 and the second driving shaft fourth driven rod 205; the X-direction (transverse) net stretching is completed through the actions;

after the net is tightened, the platform assembly 8 ascends through the lifting device to enable the net frame on the platform assembly 8 to be attached to the silk net tightly.

In conclusion, the full-automatic net stretching machine has the following advantages:

1. the transverse long edge tensioning device on each side is divided into two parts, has two screen stretching modes, and can be suitable for stretching various types of screen printing plates;

2. the method is suitable for obliquely-woven silk screens, and can save more than 20% of the use amount of the gauze;

3. the mode of combining chain transmission and screw rod transmission is adopted, so that the transmission ratio is ensured, the equipment cost is reduced, the requirement on the working environment is low, and the transmission mechanism is suitable for long-distance transmission; meanwhile, the device has the advantages of accurate transmission positioning and stable transmission of the screw rod;

4. the platform lifting mode adopts an eccentric wheel transmission mode, so that the equipment cost is reduced, and the transmission is stable;

5. the short edge platform frame and the tensioning device on one longitudinal side are respectively provided with an electromagnet, the auxiliary platform moves towards the tensioning device on the side, the net stretching area is expanded, and a manual dragging mode is replaced;

6. the tensioning device is provided with a guide support shaft to prevent the tensioning device from bending and deforming;

7. a linear clamping mode is adopted, so that the same movement amount is ensured, and the quadrilateral deformation of the screen plate during screen stretching is reduced;

8. the bottom of the platform is provided with a support shaft to prevent the platform from deforming;

9. the pneumatic locking of the two sides of the transverse long edge has an automatic angle releasing function, and compared with the pneumatic locking of other positions, the pneumatic locking of the transverse long edge has delay in the action process, so that the silk screen is prevented from being damaged due to overlarge corner tension.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.