阅读说明：本技术 一种用于隔膜下拉的夹取机构 (Clamping mechanism for pulling diaphragm down ) 是由 曹海霞 杨琪 杨春超 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种用于隔膜下拉的夹取机构,夹爪,用于夹取隔膜；第一滑块,夹爪设置于第一滑块上；推进气缸,推进气缸包括气缸本体以及可相对气缸本体伸缩的推进杆,推进杆的末端与第一滑块连接,推进气缸连接有比例阀；第二滑块,气缸本体固定设置在第二滑块上；驱动机构,驱动机构与第二滑块连接且驱动第二滑块往复移动。夹爪在驱动机构和推进气缸的驱动叠加作用下共同实现隔膜的前移输送。由于推进气缸连接有比例阀,通过比例阀的控制可以实现对隔膜自身张力的变化补偿,使得隔膜能够维持稳定的张力来完成整个卷绕过程,隔膜卷绕松紧程度基本一致,进而确保了电芯的质量。(The invention discloses a clamping mechanism for pulling a diaphragm downwards, which comprises clamping jaws, a clamping mechanism and a clamping mechanism, wherein the clamping jaws are used for clamping the diaphragm; the clamping jaw is arranged on the first sliding block; the propelling cylinder comprises a cylinder body and a propelling rod which can stretch relative to the cylinder body, the tail end of the propelling rod is connected with the first sliding block, and the propelling cylinder is connected with a proportional valve; the cylinder body is fixedly arranged on the second sliding block; and the driving mechanism is connected with the second sliding block and drives the second sliding block to reciprocate. The clamping jaw jointly realizes the forward conveying of the diaphragm under the driving superposition action of the driving mechanism and the propulsion cylinder. Because the propulsion cylinder is connected with the proportional valve, the change compensation of the self tension of the diaphragm can be realized through the control of the proportional valve, so that the diaphragm can maintain stable tension to complete the whole winding process, the winding tightness of the diaphragm is basically consistent, and the quality of the battery cell is further ensured.)

1. A clamping mechanism for membrane pulldown, comprising:

a jaw for gripping the diaphragm;

the clamping jaw is arranged on the first sliding block;

the propelling cylinder comprises a cylinder body and a propelling rod which can stretch relative to the cylinder body, the tail end of the propelling rod is connected with the first sliding block, and the propelling cylinder is connected with a proportional valve;

the cylinder body is fixedly arranged on the second sliding block;

and the driving mechanism is connected with the second sliding block and drives the second sliding block to reciprocate.

2. The pick mechanism for membrane pulldown as claimed in claim 1, wherein: the clamping jaws comprise two clamping jaws, a supporting rod, a driving connecting rod, a transverse driving shaft and a driving cylinder, wherein the clamping jaws comprise a clamping end for clamping the diaphragm and a driving end opposite to the clamping end; one end of the support rod is rotatably connected with the middle part of one of the clamping pieces, and the other end of the support rod is rotatably connected with the middle part of the other clamping piece; the number of the driving connecting rods is two, the driving connecting rods respectively comprise first ends and second ends, the first ends of the two driving connecting rods are respectively and rotatably connected to the driving ends of the corresponding clamping pieces, the transverse driving shaft is perpendicular to the two driving connecting rods, and the second ends of the two driving connecting rods are jointly and rotatably arranged on the transverse driving shaft; the driving cylinder comprises a cylinder rod capable of reciprocating, and the tail end of the cylinder rod is connected with the transverse driving shaft; when the air cylinder rod drives the transverse driving shaft to move, the distance between the clamping ends of the two clamping pieces changes.

3. The pick mechanism for membrane pulldown as claimed in claim 2, wherein: the thickness of the clamping piece is gradually reduced from the middle part to the clamping end.

4. The pick mechanism for membrane pulldown as claimed in claim 3, wherein: the two clamping ends are protruded upwards on the opposite clamping surfaces to form pressing parts.

5. The pick mechanism for membrane pulldown as claimed in claim 4, wherein: one of the pressing parts and the clamping piece are manufactured into a whole, and the other pressing part is soft glue embedded on the clamping surface.

6. The pick mechanism for membrane pulldown as claimed in claim 5, wherein: the middle part of the clamping end is provided with an opening, and the pressing part is positioned on two sides of the opening.

7. The pick mechanism for membrane pulldown as claimed in claim 2, wherein: the air cylinder rod is provided with a guide block, the guide block is provided with a fixed limiting groove, the limiting groove limits the guide block to slide in one direction, and the sliding direction of the limiting groove limiting guide block is consistent with the moving direction of the air cylinder rod.

8. The pick mechanism for membrane pulldown as claimed in claim 2, wherein: the quantity of vaulting pole is two and sets up respectively in the both sides of clamping piece.

9. The pick mechanism for membrane pulldown as claimed in claim 8, wherein: the two clamping pieces are arranged up and down symmetrically, and the central axis of the air cylinder rod is positioned on the symmetrical planes of the two clamping pieces.

10. The pick mechanism for membrane pulldown as claimed in claim 2, wherein: the distance from the clamping end to the middle rotation point of the clamping piece is greater than the distance from the driving end to the middle rotation point of the clamping piece.

Technical Field

The invention relates to the technical field of lithium battery sheet-making and winding, in particular to a clamping mechanism for pulling down a diaphragm.

Background

When the single-winding needle of the winding head winds the diaphragm at a single station, the clamping jaw for clamping the diaphragm needs to be matched with the winding action to continuously convey the diaphragm so as to complete the winding of the diaphragm. In order to ensure that the diaphragm can be tightly wound inside the battery cell, the diaphragm needs to be kept in a tight state under a general condition so that the winding needle can smoothly complete the winding of the diaphragm.

In order to keep the membrane taut, it is necessary to provide a tension at all times during the delivery of the membrane. One end of the diaphragm is clamped on the clamping jaw, and the other end of the diaphragm is wound inside the battery cell. The winding linear speed of the membrane is slightly larger than the conveying speed of the clamping jaws, so that the tension is ensured to exist all the time.

However, the tension provided by the method is not adjustable, the diaphragm is easy to deform and wrinkle in the winding process, and the winding tightness of the diaphragm is easy to be inconsistent, so that the quality of the battery cell is influenced.

Disclosure of Invention

The invention aims to provide a clamping mechanism for pulling down a diaphragm, so as to solve the problems in the background technology.

The technical scheme adopted for solving the technical problems is as follows: a clamping mechanism for membrane pulldown, comprising:

a jaw for gripping the diaphragm;

the clamping jaw is arranged on the first sliding block;

the propelling cylinder comprises a cylinder body and a propelling rod which can stretch relative to the cylinder body, the tail end of the propelling rod is connected with the first sliding block, and the propelling cylinder is connected with a proportional valve;

the cylinder body is fixedly arranged on the second sliding block;

and the driving mechanism is connected with the second sliding block and drives the second sliding block to reciprocate.

As an improvement of the above scheme, the clamping jaw comprises two clamping pieces, a supporting rod, a driving connecting rod, a transverse driving shaft and a driving cylinder, wherein the clamping pieces comprise a clamping end for clamping the diaphragm and a driving end opposite to the clamping end; one end of the support rod is rotatably connected with the middle part of one of the clamping pieces, and the other end of the support rod is rotatably connected with the middle part of the other clamping piece; the number of the driving connecting rods is two, the driving connecting rods respectively comprise first ends and second ends, the first ends of the two driving connecting rods are respectively and rotatably connected to the driving ends of the corresponding clamping pieces, the transverse driving shaft is perpendicular to the two driving connecting rods, and the second ends of the two driving connecting rods are jointly and rotatably arranged on the transverse driving shaft; the driving cylinder comprises a cylinder rod capable of reciprocating, and the tail end of the cylinder rod is connected with the transverse driving shaft; when the air cylinder rod drives the transverse driving shaft to move, the distance between the clamping ends of the two clamping pieces changes.

As an improvement of the scheme, the thickness of the clamping piece is gradually reduced from the middle part to the clamping end.

As an improvement of the scheme, the two clamping ends are upwards protruded on the opposite clamping surfaces to form pressing parts.

As an improvement of the above scheme, one of the pressing parts and the clamping piece are made into a whole, and the other pressing part is soft glue embedded on the clamping surface.

As an improvement of the scheme, the middle part of the clamping end is provided with an opening, and the pressing parts are positioned on two sides of the opening.

As an improvement of the above scheme, the cylinder rod is provided with a guide block, the guide block is provided with a fixed limiting groove, the limiting groove limits the guide block to slide in one direction, and the sliding direction of the limiting groove limits the guide block to be consistent with the moving direction of the cylinder rod.

As an improvement of the scheme, the number of the support rods is two and the support rods are respectively arranged on two sides of the clamping piece.

As an improvement of the scheme, the two clamping pieces are arranged in an up-down symmetrical mode, and the central axis of the air cylinder rod is located on the symmetrical plane of the two clamping pieces.

As an improvement of the scheme, the distance from the clamping end to the middle rotating point of the clamping piece is larger than the distance from the driving end to the middle rotating point of the clamping piece.

Has the advantages that: the driving mechanism drives the second sliding block to move forward, the propulsion cylinder pushes the first sliding block to move forward, and the clamping jaws jointly realize forward conveying of the diaphragm under the driving superposition effect of the driving mechanism and the propulsion cylinder. The diaphragm is held in a tension state by the winding mechanism. Because the propulsion cylinder is connected with a proportional valve, the proportional valve generally has pressure compensation performance, and the output pressure can not be influenced by load change. The change compensation of the self tension of the diaphragm can be realized through the control of the proportional valve, so that the diaphragm can maintain stable tension to complete the whole winding process, the winding tightness of the diaphragm is basically consistent, and the quality of the battery cell is further ensured.

Drawings

The invention is further described with reference to the following figures and examples:

FIG. 1 is a schematic structural view of a gripping mechanism according to an embodiment of the present invention;

FIG. 2 is a schematic view of the gripping mechanism in an initial state;

FIG. 3 is a schematic view of the clamping mechanism advancing to achieve membrane clamping;

FIG. 4 is a schematic view of the clamping mechanism moving backward to achieve a membrane pull-down state;

FIG. 5 is a schematic view of the gripping mechanism advancing to effect winding of the separator;

FIG. 6 is a schematic view of the jaw in an open position;

figure 7 is a schematic view of the structure of the clamping jaw in a membrane clamping state.

Detailed Description

Referring to fig. 1 to 7, an embodiment of the present invention provides a clamping mechanism for pulling down a membrane, which mainly comprises a clamping jaw 10, a first slider 120, a second slider 130, a propulsion cylinder 110, a driving mechanism 140, and a frame 100.

Wherein the clamping jaw 10 can be opened and clamped for gripping the membrane 70, and the clamping jaw 10 is integrally mounted on the first slider 120 to be advanced and retracted synchronously with the first slider 120.

The propulsion cylinder 110 is composed of a cylinder body 111 and a propulsion rod 112 that is extendable and retractable with respect to the cylinder body 111. The cylinder body 111 is fixedly mounted on the second slider 130, and moves forward and backward synchronously with the second slider 130. A linear slide rail is installed between the first slider 120 and the second slider 130, so that the first slider 120 can move back and forth relative to the second slider 130. The end of the push rod 112 is fixedly connected with the first slider 120, and the first slider 120 follows the reciprocating movement when the push rod 112 reciprocates.

The driving mechanism 140 is fixedly installed on the frame 100, and meanwhile, a driving portion of the driving mechanism 140 is integrally connected with the second slider 130, so that the second slider 130 can reciprocate under the driving of the driving mechanism 140.

Meanwhile, the propulsion cylinder 110 is connected with a proportional valve, and the proportional valve can remotely control the propulsion pressure of the propulsion cylinder 110.

The driving mechanism 140 drives the second slider 130 to move forward, so as to integrally drive the propulsion cylinder 110 and the clamping jaw 10 to move forward; meanwhile, the propulsion cylinder 110 can also propel the first slide block 120 to move forwards and independently control the clamping jaws 10 to move forwards. The clamping jaws 10 jointly realize the forward conveying of the diaphragm 70 under the driving superposition of the driving mechanism 140 and the propulsion cylinder 110. The diaphragm 70 is kept in a tensile state by the winding of the winding mechanism. Since the propulsion cylinder 110 is connected with a proportional valve, which generally has a pressure compensation capability, the output pressure may not be affected by a load change. The change compensation of the tension of the diaphragm 70 can be realized through the control of the proportional valve, so that the diaphragm 70 can maintain stable tension to complete the whole winding process, the winding tightness of the diaphragm 70 is basically consistent, and the quality of the battery cell 160 is further ensured.

In this embodiment, the driving mechanism 140 is specifically a screw mechanism, the moving block 143 sleeved on the screw 142 is integrally installed with the second slider 130, and the servo motor 141 drives the screw 142 to rotate forward and backward, so as to drive the second slider 130 to move forward and backward.

The clamping jaw 10 is mainly composed of a clamping piece 60, a support rod 50, a driving connecting rod 40, a transverse driving shaft 30, a driving air cylinder 20 and the like. Wherein, the number of the clamping pieces 60 is two and is arranged up and down symmetrically, and the clamping pieces 60 comprise a clamping end for clamping the diaphragm 70 and a driving end opposite to the clamping end. One end of the stay bar 50 is rotatably connected with the middle part of one of the clamping pieces 60, the other end of the stay bar 50 is rotatably connected with the middle part of the other clamping piece 60, and both the clamping pieces 60 can rotate clockwise or anticlockwise around the end part of the stay bar 50. The number of the stay bars 50 can be one or more, and when the number of the stay bars 50 is one, the stay bars 50 are respectively inserted in the middle of the two clamping pieces 60 and hinged with the clamping pieces 60; when the number of the stay 50 is two, the stays 50 are respectively located at both sides of the clip 60 and the ends are hinged with the clip 60.

Meanwhile, the number of the driving links 40 is two. Specifically, the driving links 40 include a first end and a second end, and the first ends of the two driving links 40 are respectively rotatably connected to the driving ends of the corresponding clamping pieces 60; the second ends of the two drive links 40 are connected by a transverse drive shaft 30, the transverse drive shaft 30 being perpendicular to the two drive links 40, the second ends of the two drive links 40 being rotatable about the transverse drive shaft 30.

A cylinder rod 21 extends from the driving cylinder 20, the driving cylinder 20 can drive the cylinder rod 20 to reciprocate, and the tail end of the cylinder rod 21 is connected with a transverse driving shaft 30 into a whole. Wherein a nesting hole may be formed at the end of the cylinder rod 21, and the transverse driving shaft 30 is inserted into the nesting hole. The transverse drive shaft 30 is preferably in clearance fit with the nesting hole such that the transverse drive shaft 30 is rotatable relative to the cylinder rod 21, facilitating the simultaneous mounting of the transverse drive shaft 30 at the second end of the drive link 40 and within the cylinder rod 21.

When the driving cylinder 20 starts to work, the cylinder rod 21 moves forwards, the transverse driving shaft 30 is horizontally pushed, the two driving connecting rods 40 rotate around the transverse driving shaft 30 in the opposite direction, the first ends of the two driving connecting rods 40 are gradually far away from each other, and the clamping ends of the two clamping pieces 60 rotate around the support rods 50 respectively until the clamping ends are abutted to provide clamping force. At this time, cylinder rod 21 advances to the maximum stroke.

The cylinder rod 21 moves backwards, and all parts move reversely until the clamping jaws 10 are opened until the cylinder rod 21 returns to the original position. The clamping jaw 10 can drive the transverse driving shaft 30 to move back and forth through the air cylinder rod 21, so that the distance between the clamping ends of the two clamping pieces 60 is changed, and the clamping and opening actions are completed. The clamping jaw 10 adopting the structure has low requirement on the stroke of the driving cylinder 20, and the link mechanism realizes the amplification of the stroke. The clamping action of the clamping jaw 10 can thus be performed more quickly, with less time and with greater efficiency.

Preferably, the thickness of the clip 60 is gradually reduced from the middle portion to the clamping end. On the one hand, the weight of the clamping pieces 60 is reduced, and the load of the driving cylinder 20 is reduced. On the other hand, when the clamping jaw 10 is opened, the opposite clamping surfaces of the two clamping ends are in a V shape, and the included angle of the V shape is equal to the included angle of the rotation required by the clamping jaw 10 to realize clamping. When the clamping piece 60 rotates gradually until the clamping jaw 10 is in a clamping state, the two clamping surfaces are basically attached, and the interference between the two clamping pieces 60 in the clamping process is effectively avoided.

Further, the two clamping ends are protruded upwards on the opposite clamping surfaces to form the pressing parts 62, and the diaphragm 70 is clamped by the pressing parts 62, so that the effect is better. One of the pressing parts 62 is integrally manufactured with the clamping piece 60, and the other pressing part 62 is soft glue embedded on the clamping surface. The soft glue is formed by plastic through injection molding and has certain softness. The clamping force applied to the membrane 70 by the soft pressure applying portion 62 and the hard pressure applying portion 62 preferably prevents the membrane 70 from slipping during the winding process, ensuring stability of the jaw 10.

Meanwhile, the middle of the grip end is provided with an opening 61, and the pressing portions 62 are located at both sides of the opening 61. The openings 61 separate the pressure applying portions 62 to achieve a plurality of spaced clamping of the diaphragm 70, which is superior in clamping effect compared to a one-piece clamping.

The driving cylinder 20 is fixedly mounted on the first slider 120, and the cylinder rod 21 is provided with a guide block 22, and the guide block 22 can be integrally manufactured with the cylinder rod 21 or fixedly mounted on the cylinder rod 21. The guide block 22 is provided with a fixed limiting groove 23, the limiting groove 23 is fixedly arranged on the first sliding block 120, the limiting groove 23 limits the guide block 22 to slide in one direction, and the limiting groove 23 limits the sliding direction of the guide block 22 to be consistent with the moving direction of the cylinder rod 21. Through setting up spacing groove 23, realize the direction of cylinder rod 21 on the one hand, on the other hand has strengthened whole drive arrangement's rigidity, ensures that cylinder rod 21 can realize accurate back-and-forth movement.

In this embodiment, the number of the stay rods 50 is two and the stay rods are respectively disposed at two sides of the clamping pieces 60, the two clamping pieces 60 are arranged in a vertical symmetrical manner, and the central axis of the cylinder rod 21 is located on a symmetrical plane of the two clamping pieces 60. The cylinder rod 21 reciprocates, and the upper and lower clamping pieces 60 synchronously rotate in opposite directions to realize clamping and opening actions. The distance from the clamping end to the middle rotating point of the clamping piece 60 is greater than the distance from the driving end to the middle rotating point of the clamping piece 60, and the design enables a small stroke to realize large opening and closing of the clamping jaw 10.

Reference is again made to fig. 2 to 5. In fig. 2, the gripping mechanism is in an initial state, the clamping jaw 10 is in an open state, and the clamping jaw 10 moves backward to an original position as a whole. In fig. 3, the clamping mechanism is in a membrane clamping state, the clamping jaw 10 moves forward to a membrane clamping station under the driving action of the driving mechanism 140, and the driving cylinder drives the clamping jaw 10 to clamp the membrane 70. In fig. 4, the gripping mechanism moves backwards to realize membrane pull-down, and the clamping jaws 10 move backwards under the driving action of the driving mechanism 140 to further realize the membrane 70 pull-down, wherein the forming size of the backward movement depends on the length of the membrane 70 required to be wound. In fig. 5, the gripping mechanism advances to achieve membrane winding, the winding needle 150 rotates to continuously wind the membrane 70, and the clamping jaw 10 advances under the driving action of the driving mechanism 140 to achieve membrane conveying in a matching manner; meanwhile, the propulsion cylinder 110 also propels the first slider 120 to move forward, and the magnitude of the propulsion force of the propulsion cylinder 110 is controlled by a proportional valve, so that the diaphragm 70 is ensured to keep constant tension in the winding process, and the influence on the quality of the battery cell 160 caused by large deformation of the diaphragm is avoided.

While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.