阅读说明：本技术 一种多工件的多点焊接装置及方法 (Multi-workpiece multi-spot welding device and method ) 是由 诸葛嘉 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种多工件的多点焊接装置及方法,装置包括机架,机架上安装有焊接工作台,焊接工作台可整体相对于机架作回转运动,且其回转运动由回转电机驱动；机架上还安装有设于焊接工作台上方的焊接装置以及设于焊接工作台下方的运输装置；焊接工作台的四角位置各安装有一组自动夹具,每个自动夹具包含套筒定位装置与铁网定位装置。本发明的多工件的多点焊接装置及方法通过设置自动夹具与焊接装置,通过PLC控制系统按时序控制各执行元件的运行顺序可实现对双层铁网与四个套筒的自动装夹、对双层铁网与套筒的每个连接点进行焊接以及对成品进行下料的过程,人工只需辅助上料自动化程度较高,生产效率高。(The invention discloses a multi-spot welding device and a multi-spot welding method for multiple workpieces, wherein the device comprises a rack, a welding workbench is arranged on the rack, the welding workbench can integrally rotate relative to the rack, and the rotating motion of the welding workbench is driven by a rotating motor; the frame is also provided with a welding device arranged above the welding workbench and a conveying device arranged below the welding workbench; a set of automatic fixtures is respectively installed at the four corners of the welding workbench, and each automatic fixture comprises a sleeve positioning device and an iron net positioning device. According to the multi-spot welding device and method for multiple workpieces, the automatic clamp and the welding device are arranged, the PLC control system controls the operation sequence of each execution element according to the time sequence, so that the processes of automatically clamping the double-layer iron net and the four sleeves, welding each connection point of the double-layer iron net and the sleeves and blanking finished products can be realized, and only auxiliary feeding automation degree is needed by manpower, and the production efficiency is high.)

1. The multi-workpiece multi-spot welding device is characterized by comprising a rack, wherein a welding workbench is arranged on the rack, the welding workbench can integrally rotate relative to the rack, and the rotating motion of the welding workbench is driven by a rotating motor;

the rack is also provided with a welding device arranged above the welding workbench and a conveying device arranged below the welding workbench;

a group of automatic clamps are respectively arranged at four corners of the welding workbench, and each automatic clamp comprises a sleeve positioning device and an iron net positioning device;

the welding device comprises four groups of welding assemblies which are arranged corresponding to the four groups of automatic clamps;

the welding assembly comprises a horizontal linear module, a rotary driving unit and a welding unit, the whole horizontal linear module can be driven by the rotary driving unit to rotate relative to the rack, and the rotating shaft of the horizontal linear module is coaxial with the central shaft of the sleeve arranged on the automatic clamp; and the welding gun of the welding unit can be driven by the first lifting driving unit to move up and down relative to the translation unit of the horizontal linear module.

2. A multi-workpiece multi-spot welding apparatus according to claim 1 wherein said welding apparatus is integrally mounted on a lift platform which is movable up and down relative to said frame by a second lift drive unit.

3. Multi-workpiece multi-spot welding device according to claim 1, characterized in that said transport means comprise a conveyor belt for receiving the finished weld.

4. A multi-workpiece multi-spot welding apparatus according to claim 1, wherein said automatic clamping means comprises a driving block and a linear motion actuator for driving said driving block to move linearly, a middle portion of said driving block being in an articulated relationship with an end portion of a telescopic rod of said linear motion actuator; one end of the driving block is in driving connection with one group of sleeve positioning devices, and the other end of the driving block is in driving connection with two groups of iron net positioning devices;

the two groups of iron net positioning devices are arranged at equal intervals relative to the sleeve positioning devices, and the included angle formed by the clamping points of the two groups of iron net positioning devices relative to the positioning center of the sleeve positioning device is 90 degrees;

the iron net positioning device is provided with two clamping points and can act on the edge positions of the upper layer and the lower layer of the double-layer iron net.

5. A multi-workpiece multi-spot welding method, applied to a control unit of a multi-workpiece multi-spot welding apparatus, the method comprising:

the method comprises the following steps: controlling the automatic clamp to clamp a double-layer iron net and four sleeves which are arranged on the welding workbench;

step two: controlling each welding assembly of the welding device to weld four connection points of the sleeve and the double-layer iron net which are positioned at the corresponding position;

step three: controlling the rotary motor to rotate to enable the welding workbench to rotate for 180 degrees;

step four: controlling the automatic clamp to release the welded workpiece, so that the released workpiece falls onto the conveying device;

step five: and controlling the transportation device to operate to transport the welded workpiece out from the lower part of the welding workbench.

6. The method for multiple spot welding of workpieces according to claim 1, wherein step two specifically comprises:

step a): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the upper layer on one side of the double-layer iron net and the sleeve;

step b): controlling the welding unit to perform a welding operation;

step c): controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve;

step d): controlling the first lifting driving unit to operate so that the welding gun descends;

step e): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the lower layer on one side of the double-layer iron net and the sleeve;

step f): controlling the welding unit to perform a welding operation;

step g): controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve;

step h): controlling the rotation driving unit to operate so that the horizontal linear module and the welding gun are integrally rotated by a fixed angle;

step i): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the lower layer on the other side of the double-layer iron net and the sleeve;

step j): controlling the welding unit to perform a welding operation;

step k): controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve;

step l): controlling the first lifting driving unit to operate so that the welding gun ascends;

step m): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the upper layer on the other side of the double-layer iron net and the sleeve;

step n): controlling the welding unit to perform a welding operation;

step o): and controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve.

7. Method for the multiple spot welding of workpieces according to claim 6, characterized in that said step a) is preceded by a step p): controlling the second lifting driving unit to operate so that the lifting platform drives all the welding units to descend; said step o) is followed by a step q): and controlling the second lifting driving unit to operate so that the lifting platform drives all the welding units to ascend.

Technical Field

The invention relates to the technical field of welding, in particular to a multi-workpiece multi-spot welding device and a multi-workpiece multi-spot welding method.

Background

The target workpiece shown in fig. 1 is composed of 5 workpieces in total, namely, a double-layer iron net 01 and four sleeves 02 arranged at four corners of the double-layer iron net 01, wherein an upper layer of the double-layer iron net 01 is a double-layer iron net part formed by steel wires, a lower layer of the double-layer iron net 01 is provided with four steel wires, the upper layer and the lower layer are connected together by welding a plurality of wavy steel wires, the four sleeves 02 are required to be welded at the four corners of the double-layer iron net 01 respectively, each corner of the double-layer iron net 01 is provided with 4 steel wire heads, namely, the 4 steel wire heads at each corner are welded and fixed with the sleeves 02, and 16 points are required to be welded between the double-layer iron net 01 and the four sleeves. The prior art means mainly relies on manual work to carry out the clamping with double-deck iron net 01 and four sleeves 02, and manual welding to every tie point in proper order, because the work piece that relates is more (1 double-deck iron net 01 and 4 sleeves 02, and the area of double-deck iron net 01 is great) and need the welded position more between double-deck iron net 01 and four sleeves 02, therefore manual clamping and welding are comparatively troublesome, and production efficiency is low.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides the multi-spot welding device and the method for multiple workpieces, which can automatically clamp and weld and have high production efficiency.

The technical scheme is as follows: in order to achieve the purpose, the multi-workpiece multi-spot welding device comprises a rack, wherein a welding workbench is arranged on the rack, the welding workbench can integrally rotate relative to the rack, and the rotating motion of the welding workbench is driven by a rotating motor;

the rack is also provided with a welding device arranged above the welding workbench and a conveying device arranged below the welding workbench;

a group of automatic clamps are respectively arranged at four corners of the welding workbench, and each automatic clamp comprises a sleeve positioning device and an iron net positioning device;

the welding device comprises four groups of welding assemblies which are arranged corresponding to the four groups of automatic clamps;

the welding assembly comprises a horizontal linear module, a rotary driving unit and a welding unit, the whole horizontal linear module can be driven by the rotary driving unit to rotate relative to the rack, and the rotating shaft of the horizontal linear module is coaxial with the central shaft of the sleeve arranged on the automatic clamp; and the welding gun of the welding unit can be driven by the first lifting driving unit to move up and down relative to the translation unit of the horizontal linear module.

Further, the welding device is integrally installed on a lifting platform, and the lifting platform can be driven by a second lifting driving unit to lift relative to the rack.

Further, the conveying device comprises a conveying belt for receiving the welding finished products.

Furthermore, the automatic clamp comprises a driving block and a linear motion execution unit which drives the driving block to do linear motion, and the middle part of the driving block is hinged with the end part of a telescopic rod of the linear motion execution unit; one end of the driving block is in driving connection with one group of sleeve positioning devices, and the other end of the driving block is in driving connection with two groups of iron net positioning devices;

the two groups of iron net positioning devices are arranged at equal intervals relative to the sleeve positioning devices, and the included angle formed by the clamping points of the two groups of iron net positioning devices relative to the positioning center of the sleeve positioning device is 90 degrees;

the iron net positioning device is provided with two clamping points and can act on the edge positions of the upper layer and the lower layer of the double-layer iron net.

A multi-workpiece multi-spot welding method applied to a control unit of a multi-workpiece multi-spot welding apparatus, the method comprising:

the method comprises the following steps: controlling the automatic clamp to clamp a double-layer iron net and four sleeves which are arranged on the welding workbench;

step two: controlling each welding assembly of the welding device to weld four connection points of the sleeve and the double-layer iron net which are positioned at the corresponding position;

step three: controlling the rotary motor to rotate to enable the welding workbench to rotate for 180 degrees;

step four: controlling the automatic clamp to release the welded workpiece, so that the released workpiece falls onto the conveying device;

step five: and controlling the transportation device to operate to transport the welded workpiece out from the lower part of the welding workbench.

Further, the second step specifically includes:

step a): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the upper layer on one side of the double-layer iron net and the sleeve;

step b): controlling the welding unit to perform a welding operation;

step c): controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve;

step d): controlling the first lifting driving unit to operate so that the welding gun descends;

step e): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the lower layer on one side of the double-layer iron net and the sleeve;

step f): controlling the welding unit to perform a welding operation;

step g): controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve;

step h): controlling the rotation driving unit to operate so that the horizontal linear module and the welding gun are integrally rotated by a fixed angle;

step i): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the lower layer on the other side of the double-layer iron net and the sleeve;

step j): controlling the welding unit to perform a welding operation;

step k): controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve;

step l): controlling the first lifting driving unit to operate so that the welding gun ascends;

step m): controlling the horizontal linear module to operate to enable the welding gun to be close to the sleeve, and enabling the end part of the welding gun to be located at the contact position between the upper layer on the other side of the double-layer iron net and the sleeve;

step n): controlling the welding unit to perform a welding operation;

step o): and controlling the horizontal linear module to operate so that the welding gun is far away from the sleeve.

Further, step a) is preceded by step p): controlling the second lifting driving unit to operate so that the lifting platform drives all the welding units to descend; said step o) is followed by a step q): and controlling the second lifting driving unit to operate so that the lifting platform drives all the welding units to ascend.

Has the advantages that: according to the multi-spot welding device and method for multiple workpieces, the automatic clamp and the welding device are arranged, the PLC control system controls the operation sequence of each execution element according to the time sequence, so that the processes of automatically clamping the double-layer iron net and the four sleeves, welding each connection point of the double-layer iron net and the sleeves and blanking finished products can be realized, and only auxiliary feeding automation degree is needed by manpower, and the production efficiency is high.

Drawings

FIG. 1 is a block diagram of a target workpiece;

FIG. 2 is a block diagram of a multi-spot welding apparatus for multiple workpieces;

FIG. 3 is a block diagram of a welded assembly;

FIG. 4 is a combined structure view of a welding table and an automatic jig;

FIG. 5 is a view showing the structure of the upper part of the automatic clamp in an opened state on a welding table;

FIG. 6 is a view of the lower portion of the automatic clamp in the welding station;

FIG. 7 is a structural view of a welding table part provided with a double-layer iron net and a sleeve;

FIG. 8 is a view showing the structure of the portion of the automatic clamp in a clamped state above the welding table;

FIG. 9 is a structural view of the iron net positioning device;

fig. 10 is a cross-sectional view of the automatic clamp.

In the figure: 01-double layer iron net; 02-a sleeve; 1-a welding bench; 2-clamping; 21-a drive block; 22-a linear motion execution unit; 221-a telescopic rod; 23-a sleeve positioning device; 231-a positioning seat; 232-centering block; 232-1-extrusion of inclined planes; 233-pull rod; 234-taper sleeve; 235-a first spring; 236-a second spring; 237-radial briquetting; 237-1-inclined plane; 238-push link; 24-a wire mesh positioning device; 241-a first lower layer positioning block; 242-a second lower layer locating block; 243-upper laminate block; 244-a fixed link; 245-a first movable link; 246-fixed link; 247-a drive link; 248-a transition link; 25-a resilient element; 26-a translation seat body; 27-a guide rod; 28-guide sleeve; 3-auxiliary positioning blocks; 31-a guide ramp; 4-a rotary electric machine; 5-welding the assembly; 51-a horizontal linear module; 511-a translation unit; 52-a rotation drive unit; 53-a welding unit; 531-welding gun; 532-welding the unit body; 54-a first lift drive unit; 6-a transportation device; 61-a conveyor belt; 7-a frame; 81-lifting platform; 82-second elevation drive unit.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The multi-workpiece multi-spot welding device shown in the attached figure 1 comprises a frame 7, wherein a welding workbench 1 is arranged on the frame 7, the welding workbench 1 can integrally rotate relative to the frame 7, and the rotating motion of the welding workbench is driven by a rotating motor 4; the frame 7 is also provided with a welding device arranged above the welding workbench 1 and a conveying device 6 arranged below the welding workbench 1; a group of automatic fixtures 2 are respectively arranged at four corners of the welding workbench 1, and each automatic fixture 2 comprises a sleeve positioning device 23 and an iron net positioning device 24; the welding apparatus includes four sets of welding members 5 provided corresponding to the four sets of the automatic jigs 2.

Through above-mentioned structural layout, four automatic fixture 2 of group can be fixed the sleeve 02 of the four corners position of double-deck iron net 01 and four corners position respectively, and four welding assembly 5 of group can the simultaneous working, weld the four corners position of double-deck iron net 01 respectively with the tie point of corresponding sleeve 02 for welding set wholly has higher clamping efficiency and welding efficiency. In addition, because weldment work platform 1 can be for frame 7 gyration, and weldment work platform 1 below has conveyer 6, consequently, after the welding is accomplished, the accessible makes weldment work platform 1 and makes automatic anchor clamps 2 loosen and make the work piece of welding completion oneself rely on gravity to break away from weldment work platform 1 and drop to conveyer 6, transports it away through conveyer 6, realizes automatic unloading.

The welding assembly 5 comprises a horizontal linear module 51, a rotary driving unit 52 and a welding unit 53, wherein the whole horizontal linear module 51 can be driven by the rotary driving unit 52 to rotate relative to the frame 7, and the rotating shaft of the horizontal linear module is coaxial with the central shaft of a sleeve 02 mounted on the automatic clamp 2; the welding unit 53 includes a welding unit body 532 and a welding gun 531, and the welding gun 531 is driven by the first elevation driving unit 54 to move up and down with respect to the translation unit 511 of the horizontal linear module 51. Since the rotation driving unit 52 drives the rotation center to be coaxial with the central axis of the sleeve 02, the horizontal linear module 51 drives the welding gun 531 to rotate integrally by driving the rotation driving unit 52, so that the welding gun 531 rotates around the sleeve 02 to change positions, and the welding gun 531 can reach welding points at different phases on the circumference of the sleeve 02 respectively. The welding gun 531 can move close to and away from the sleeve 02 through the horizontal linear module 51, so that when the welding gun 531 moves among different welding points, the welding gun 531 can be away from the sleeve 02 to change positions, and the interference between the welding gun 531 and the sleeve 02 or the double-layer iron net 01 is prevented. The welding gun 531 is movable between upper and lower welding points by the first elevation driving unit 54. In summary, by welding the assembly 5, the welding gun 531 can reach each welding point of its corresponding welding position.

In order to prevent the welding table 1 from interfering with the welding assembly 5 when being turned over and to prevent the welding assembly 5 from interfering with a user to place the double-layer iron net 01 and the sleeve 02 on the welding table 1, the welding device is integrally installed on a lifting platform 81, and the lifting platform 81 can be driven by a second lifting driving unit 82 to lift relative to the frame 7. When the welding workbench 1 needs to be turned over or the feeding is needed manually, the second lifting driving unit 82 can be controlled to act to lift the whole welding assembly 5. The welding unit body 532 is mounted on the elevating platform 81.

The transport device 6 comprises a conveyor belt 61 for receiving the finished weld.

As shown in fig. 5 and 6, the automatic clamp 2 includes a driving block 21 and a linear motion actuator 22 for driving the driving block 21 to move linearly, and the middle of the driving block 21 is hinged to the end of the extension rod 221 of the linear motion actuator 22; one end of the driving block 21 is in driving connection with a group of sleeve positioning devices 23, and the other end of the driving block is in driving connection with two groups of iron net positioning devices 24; the two groups of iron net positioning devices 24 are arranged at equal intervals relative to the sleeve positioning device 23, and an included angle formed by clamping points of the two groups of iron net positioning devices 24 relative to a positioning center of the sleeve positioning device 23 is 90 degrees; the iron net positioning device 24 has two clamping points, and can act on the edge positions of the upper layer and the lower layer of the double-layer iron net 01, as shown in fig. 8, a state diagram of the double-layer iron net 01 and the sleeve 02 mounted on the welding tool is shown. The linear motion actuator 22 is a cylinder here.

Through the structure, through the telescopic motion of the same linear motion execution unit 22 of the same automatic clamp 2, the two groups of iron net positioning devices 24 and the one group of sleeve positioning devices 23 which have the linkage effect can be driven to operate simultaneously, the clamping positioning of the sleeve 02 and the clamping effect on the double-layer iron net 01 can be completed simultaneously in one push-down stroke, and the efficiency is high. Because the iron net positioning devices 24 and the sleeve positioning devices 23 are respectively connected to two sides of the driving block 21, and the middle portion of the driving block 21 and the end portion of the telescopic rod 221 of the linear motion execution unit 22 are in a hinged relationship, when the driving block 21 is pushed by the telescopic rod 221 to descend, if any one of the iron net positioning devices 24 and the sleeve positioning devices 23 moves in place to clamp a corresponding element, the connecting end of the iron net positioning device 24 and the connecting end of the sleeve positioning device 23 are fixed, at the moment, the middle portion of the driving block 21 continues to descend under the action of the telescopic rod 221, a lever can be formed to act on one end of the iron net positioning device 24 and one end of the sleeve positioning device 23, which are not both, so that the iron net positioning devices can continue to operate until being tensioned, and the structure can effectively ensure that both the two sets of iron net positioning devices.

As shown in fig. 10, the telescopic rod 221 of the linear motion executing unit 22 is further connected to a translation base 26 moving along with the telescopic rod; two elastic elements 25 are disposed between the driving block 21 and the translation base 26, and the two elastic elements 25 are located at two sides of the telescopic rod 221. Further, the elastic element 25 is a high-strength rubber. Two guide rods 27 are fixedly installed on the translation seat body 26, and a guide sleeve 28 in sliding fit with each guide rod 27 is arranged on the welding workbench 1 corresponding to each guide rod 27.

Through the structure, as the two elastic elements 25 are symmetrically arranged between the driving block 21 and the translation seat body 26, the driving block 21 can be ensured to be kept in a relatively straight state when the telescopic rod 221 is driven to descend, and only after the positioning device at one end is tensioned and cannot be pulled down continuously, in order to tension the positioning device at the other end, the driving block 21 can generate a skew effect on the elastic element 25 at one side to tension the positioning device at the other end, so that a better clamping purpose is achieved, and the elastic elements 25 can prevent the driving block 21 from generating the skew too early to influence the clamping effect of the positioning devices at two sides.

Specifically, as shown in fig. 9, the iron net positioning device 24 includes a first lower positioning block 241, a second lower positioning block 242, an upper laminating block 243, and a driving link structure; the first lower positioning block 241 is fixed on the welding table 1; the drive link structure includes a fixed link 244, a first movable link 245, a second movable link 246, a drive link 247, and a transition link 248; the fixed link 244 is fixed to the welding table 1; the first movable connecting rod 245 and the second movable connecting rod 246 are always parallel to each other, and one end of each of the first movable connecting rod and the second movable connecting rod is hinged to the fixed connecting rod 244, and the other end of each of the first movable connecting rod and the second movable connecting rod is provided with the second lower-layer positioning block 242 and the upper-layer positioning block 243; the driving link 247 is always parallel to the fixed link 244, the lower end of the driving link is connected to the driving block 21 through the transition link 248, and both ends of the transition link 248 are respectively connected to the driving block 21 and the driving link 247 in a rotating manner.

Specifically, a V-shaped positioning groove is formed on the first lower positioning block 241, and two groove surfaces of the V-shaped positioning groove are respectively parallel to and perpendicular to the clamping end surface of the welding table 1; another V-shaped positioning groove is formed in the second lower positioning block 242, and when the second lower positioning block 242 and the first lower positioning block 241 are in a closed clamping state, the V-shaped positioning grooves of the two positioning blocks enclose a square clamping cavity; the upper lamination block 243 is formed with an inverted bucket-shaped groove.

Through the structure of the iron net positioning device 24, because the lower layer of the double-layer iron net 01 is four independent steel wires, the end part of the double-layer iron net 01 can be deformed, the iron net positioning device 24 can press the upper layer of the double-layer iron net 01 through the upper layer block 243 to ensure that the upper layer of the double-layer iron net 01 can not be separated from the welding workbench 1, and meanwhile, the steel wires at the lower layer of the double-layer iron net 01 can be corrected through the matching of the first lower layer positioning block 241 and the second lower layer positioning block 242, so that the end part of the steel wire can be attached to the. The link structure with parallelogram arrangement can simultaneously complete the buckling action of the second lower layer positioning block 242 relative to the first lower layer positioning block 241 and the pressing action of the upper layer positioning block 243, and more tasks can be completed with less actions.

As shown in fig. 10, the sleeve positioning device 23 includes a cylindrical positioning seat 231, a plurality of centering blocks 232 are circumferentially arranged on the positioning seat 231 in an array manner, a pull rod 233 capable of driving the centering blocks 232 to move along the radial direction of the positioning seat 231 is slidably arranged in the positioning seat 231, and one end of the pull rod 233 is connected to the driving block 21.

Specifically, a taper sleeve 234 capable of sliding in the axial direction of the pull rod 233 is arranged on the pull rod 233, a first spring 235 is arranged between the taper sleeve 234 and a shaft shoulder on the pull rod 233, a pressing inclined surface 232-1 is formed on the centering block 232, an outer tapered surface of the taper sleeve 234 can press the pressing inclined surface 232-1 to enable the centering block 232 to move outwards relative to the positioning seat 231, a second spring 236 is arranged between each centering block 232 and the positioning seat 231, and the second spring 236 enables the centering block 232 to have a tendency of moving inwards relative to the positioning seat 231. In addition, a plurality of radial pressing blocks 237 for radially positioning the sleeve 02 are arranged in a circumferential array at the upper end of the positioning seat 231, the radial pressing blocks 237 can make radial sliding motion relative to the positioning seat 231, a pushing connecting rod 238 is arranged between each radial pressing block 237 and the pull rod 233, and two ends of each pushing connecting rod 238 are respectively connected with the radial pressing blocks 237 and the pull rod 233 in a rotating manner. The radial pressing block 237 is provided with an inclined surface 237-1, when the radial pressing block 237 moves outwards relative to the positioning seat 231, the inclined surface 237-1 can act on the upper end of the sleeve 02 to form an axial force on the sleeve 02 so as to push the sleeve 02 into position and prevent the sleeve 02 from moving axially.

Two operations of centering and axial positioning of the sleeve 02 can be realized through one-time pull-down movement of the pull rod 233, and in the descending process of the pull rod 233, the taper sleeve 234 firstly acts on the extrusion inclined plane 232-1 on the centering block 232, so that the centering block 232 moves outwards to act on the inner wall of the sleeve 02 to center the sleeve 02; then, since the centering block 232 is already against the inner wall of the sleeve 02, the taper sleeve 234 cannot be further lowered, the pull rod 233 continues to be lowered by pressing the first spring 235 between the pull rod and the taper sleeve 234, and during the further lowering, the pull rod 233 acts on the radial pressing block 237 by pushing the connecting rod 238, so that the radial pressing block 237 moves outwards relative to the positioning seat 231, and the inclined surface 237-1 of the radial pressing block 237 acts on the upper end of the sleeve 02 to form an axial force to push the sleeve 02 into place.

In addition, in order to place the double-layer iron net 01 in place, a plurality of auxiliary positioning blocks 3 are mounted on the welding workbench 1, and the auxiliary positioning blocks 3 are provided with guide inclined planes 31; when the double-layer iron net 01 is installed on the welding workbench 1, at least one auxiliary positioning block 3 is respectively arranged on four sides of the double-layer iron net 01, an inward-arranged guide inclined plane 31 is arranged on the auxiliary positioning block 3, and the guide inclined plane 31 can effectively guide the double-layer iron net 01 to be quickly placed in place.

The invention also provides a multi-spot welding method of multiple workpieces, which is applied to a control unit of a multi-spot welding device of multiple workpieces, wherein the control unit is preferably a PLC (programmable logic controller), and the method comprises the following steps:

the method comprises the following steps: controlling the automatic clamp 2 to clamp a double-layer iron net 01 and four sleeves 02 which are arranged on the welding workbench 1;

step two: controlling each welding assembly 5 of the welding device to weld four connection points of the sleeve 02 and the double-layer iron net 01 which are located at the corresponding position;

step three: controlling the rotary motor 4 to rotate to enable the welding workbench 1 to rotate for 180 degrees;

step four: controlling the automatic clamp 2 to release the welded workpiece, so that the released workpiece falls onto the conveying device 6;

step five: and controlling the transportation device 6 to operate to transport the welded workpiece out from the lower part of the welding workbench 1.

Through the steps, the processes of automatically clamping the double-layer iron net and four sleeves, welding each connecting point of the double-layer iron net and the sleeves and blanking finished products are realized, higher automation is realized, and the production efficiency is higher.

Further, the second step specifically includes:

step a): controlling the horizontal linear module 51 to operate so that the welding gun 531 approaches the sleeve 02, and enabling the end part of the welding gun 531 to be located at a contact position between the upper layer of one side of the double-layer iron net 01 and the sleeve 02;

step b): controls the welding unit 53 to perform a welding operation;

step c): controlling the horizontal linear module 51 to operate so that the welding gun 531 is far away from the sleeve 02;

step d): controlling the first elevation driving unit 54 to operate such that the welding gun 531 descends;

step e): controlling the horizontal linear module 51 to operate so that the welding gun 531 approaches the sleeve 02, and enabling the end part of the welding gun 531 to be located at a contact position between the lower layer on one side of the double-layer iron net 01 and the sleeve 02;

step f): controls the welding unit 53 to perform a welding operation;

step g): controlling the horizontal linear module 51 to operate so that the welding gun 531 is far away from the sleeve 02;

step h): controlling the rotation driving unit 52 to operate so that the horizontal linear module 51 and the welding gun 531 integrally rotate by a fixed angle;

step i): controlling the horizontal linear module 51 to operate to enable the welding gun 531 to approach the sleeve 02, and enabling the end part of the welding gun 531 to be located at a contact position between the lower layer of the other side of the double-layer iron net 01 and the sleeve 02;

step j): controls the welding unit 53 to perform a welding operation;

step k): controlling the horizontal linear module 51 to operate so that the welding gun 531 is far away from the sleeve 02;

step l): controlling the first elevation driving unit 54 to operate such that the welding gun 531 ascends;

step m): controlling the horizontal linear module 51 to operate so that the welding gun 531 approaches the sleeve 02, and enabling the end part of the welding gun 531 to be located at a contact position between the upper layer on the other side of the double-layer iron net 01 and the sleeve 02;

step n): controls the welding unit 53 to perform a welding operation;

step o): the horizontal linear module 51 is controlled to operate so that the welding gun 531 is away from the sleeve 02.

Through the steps, the welding assembly 5 can weld four welding points of the same sleeve 02 and the double-layer iron net 01 in sequence, the process is reasonable, the action beat is fast, and the efficiency is high.

Further, step a) is preceded by step p): controlling the second lifting driving unit 82 to operate so that the lifting platform 81 drives all the welding units 53 to descend; said step o) is followed by a step q): the second lifting driving unit 82 is controlled to operate, so that the lifting platform 81 drives all the welding units 53 to ascend.

According to the multi-spot welding device and method for multiple workpieces, the automatic clamp and the welding device are arranged, the PLC control system controls the operation sequence of each execution element according to the time sequence, so that the processes of automatically clamping the double-layer iron net and the four sleeves, welding each connection point of the double-layer iron net and the sleeves and blanking finished products can be realized, and only auxiliary feeding automation degree is needed by manpower, and the production efficiency is high.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.