Pole piece cutting surface burr detection assembly

Abstract

The utility model provides a pole piece cutting surface burr detection assembly, which comprises a feeding mechanism, a carrying mechanism, a positioning mechanism and a detection mechanism, and is characterized in that the carrying mechanism is used for carrying a battery pole piece so as to reciprocate between the positioning mechanism and the detection mechanism; the carrying mechanism comprises a first linear module and an alignment platform, the alignment platform is arranged on the first linear module and driven by the first linear module, a platform photographing plate is arranged on the alignment platform, and the battery pole piece is borne on the platform photographing plate; in the horizontal plane, the first linear module drives the alignment platform to move in the first direction, the alignment platform drives the platform photographing plate to horizontally move in the first direction and the second direction and rotate in the horizontal plane, and the first direction is perpendicular to the second direction. According to the utility model, through mutual cooperation of the feeding mechanism, the carrying mechanism, the positioning mechanism and the detection mechanism, rapid detection and judgment of the burr condition of the to-be-detected edge of the battery pole piece are realized, manual intervention is reduced, problems can be found in time, and the product quality is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a burr detection component for electrode cutting surfaces. Background Technology

[0002] After the battery electrode sheets are cut by the stacking machine, burrs will inevitably be produced on the cut edges. Therefore, manual sampling is required to determine whether the burrs on the cut edges of the battery electrode sheets are acceptable. Specifically, the manual sampling process involves observing the burrs under a microscope and manually measuring the size of the burrs to determine whether they are acceptable. This method wastes a lot of manpower and resources, has low sampling efficiency, makes it difficult to detect problems in a timely manner, and easily produces defective products. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a burr detection component for electrode cutting surface, which reduces manual intervention, helps to detect problems in a timely manner, and ensures product quality.

[0004] The embodiments of this utility model are achieved through the following technical solutions:

[0005] A burr detection assembly for electrode cutting surfaces includes a feeding mechanism, a transport mechanism, a positioning mechanism, and a detection mechanism. The feeding mechanism is used to load or move battery electrodes from the transport mechanism. The transport mechanism carries the battery electrodes and reciprocates between the positioning mechanism and the detection mechanism. The detection range of the detection mechanism is located on the running path of the edge of the battery electrode to be detected. The transport mechanism includes a first linear module and an alignment platform. The alignment platform is disposed on and driven by the first linear module. A platform imaging plate is configured on the alignment platform, and the battery electrode is carried on the platform imaging plate. In a horizontal plane, the first linear module drives the alignment platform to move along a first direction, and the alignment platform drives the platform imaging plate to translate in the first direction and a second direction, and to rotate in the horizontal plane. The first direction is perpendicular to the second direction.

[0006] According to a preferred embodiment, the platform imaging board includes a base plate and a support plate arranged longitudinally at intervals. The base plate is assembled on and driven by the alignment platform, and the base plate and the support plate are connected by a support plate. The upper surface of the support plate is provided with negative pressure holes for adsorbing the battery electrode sheets.

[0007] According to a preferred embodiment, the positioning mechanism includes a backlight and a positioning camera arranged longitudinally at intervals. When the transport mechanism is in the positioning mechanism, the side of the battery electrode to be detected is located between the backlight and the positioning camera.

[0008] According to a preferred embodiment, the burr detection assembly further includes a machine base, the upper surface of which is parallel to a horizontal plane; the positioning mechanism further includes a longitudinal support and a transverse support connected to each other, the longitudinal support being assembled on the machine base, the transverse support being disposed at the top of the longitudinal support, and four positioning cameras corresponding to the four apex corners of the battery electrode, the positioning cameras being adjustablely disposed on the transverse support.

[0009] According to a preferred embodiment, a first guide bar extending in a second direction is provided on one side of the horizontal support facing the upper surface of the machine platform. A second guide bar extending in a first direction is adjustablely mounted on the first guide bar. A third guide bar extending in a longitudinal direction is adjustablely mounted on the second guide bar. The positioning camera is adjustablely mounted on the third guide bar. The first direction, the second direction, and the longitudinal direction are perpendicular to each other.

[0010] According to a preferred embodiment, the detection mechanism includes a camera support, a base plate, and a detection camera, wherein the detection camera is mounted on the base plate; the camera support is provided with a mounting plane parallel to the horizontal plane, the mounting plane is provided with a guide groove extending along a second direction, the base plate is provided with a guide protrusion, the base plate is mounted on the mounting plane, and the guide protrusion is slidably embedded in the guide groove; the base plate can move relative to the camera support along the second direction to approach or move away from the edge to be detected of the battery electrode; the running path of the edge to be detected of the battery electrode is defined to extend along a first direction, the first direction being perpendicular to the second direction, and both being parallel to the horizontal plane.

[0011] According to a preferred embodiment, the base plate is provided with a first waist-shaped adjustment hole, the length direction of which is parallel to the second direction, and the assembly plane is provided with a first screw hole corresponding to the first waist-shaped adjustment hole, and a plurality of first screw holes are spaced apart along the second direction.

[0012] According to a preferred embodiment, the feeding mechanism includes a first driving member and a gripping member disposed on the first driving member. The gripping member includes an integrated plate, an extension frame is adjustablely mounted on the integrated plate, and a suction cup is adjustablely mounted on the extension frame via a rotating platform. The suction cup is used to adsorb the battery electrode sheet.

[0013] According to a preferred embodiment, the extension frame is slidably connected to the integrated plate, and the extension frame is capable of moving longitudinally relative to the integrated plate; the integrated plate is provided with a second driving member for driving the extension frame to move longitudinally.

[0014] According to a preferred embodiment, the second driving component includes a limiting frame plate and a transmission screw. The limiting frame plate is slidably connected to the integrated plate, and the transmission screw is rotatably mounted on the integrated plate. The transmission screw extends longitudinally, and the limiting frame plate is threadedly connected to the transmission screw. In the longitudinal direction, the limiting frame plate is higher than the extension frame. A limiting block is provided on the limiting frame plate, and a limiting stop block matching the limiting block is provided on the extension frame. The limiting block is located on the path of the limiting stop block moving downwards in the longitudinal direction. A cylinder is provided on the limiting frame plate, and the cylinder is used to drive the extension frame to move longitudinally.

[0015] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0016] This invention enables rapid detection and judgment of burrs on the cut edge of the battery electrode sheet, i.e. the edge to be inspected, through the cooperation of the feeding mechanism, the carrying mechanism, the positioning mechanism, and the detection mechanism. This facilitates real-time online sampling inspection of battery electrodes, reduces manual intervention, helps to detect problems in a timely manner, and ensures product quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural schematic diagram of the electrode cutting surface burr detection component provided in an embodiment of this utility model;

[0019] Figure 2 A three-dimensional structural diagram of the detection mechanism provided in the embodiment of this utility model;

[0020] Figure 3 A schematic diagram of the assembly structure of the positioning camera provided in an embodiment of this utility model;

[0021] Figure 4 A three-dimensional structural schematic diagram of the transport mechanism provided for an embodiment of this utility model;

[0022] Figure 5 A three-dimensional structural diagram of the gripping component provided in an embodiment of this utility model;

[0023] Figure 6 A schematic diagram of the assembly structure of the transmission lead screw and the limiting frame plate provided in an embodiment of this utility model;

[0024] Figure 7A three-dimensional structural diagram of the guide block provided in an embodiment of this utility model.

[0025] Icons: 1. Feeding mechanism; 11. First driving component; 12. Gripping component; 121. Integrated plate; 122. Extension frame; 1221. Limiting block; 123. Rotating platform; 124. Suction cup; 125. Limiting frame plate; 1251. Limiting block; 1252. Cylinder; 126. Transmission screw; 2. Carrying mechanism; 21. First linear module; 22. Alignment platform; 23. Platform camera plate; 231. Base plate; 232. Support plate; 233. Bearing plate; 3. Detection mechanism; 31. Detection camera; 32. Camera support; 321. Guide groove 322, First screw hole; 33, Base plate; 331, Guide protrusion; 332, First waist-shaped adjustment hole; 4, Positioning mechanism; 41, Backlight; 42, Horizontal support; 421, First guide bar; 4211, Guide block; 42111, First guide hole; 42112, Second guide hole; 42113, First adjustment groove; 42114, Second adjustment groove; 422, Second guide bar; 423, Third guide bar; 43, Vertical support; 44, Positioning camera; 5, Battery electrode; 6, Machine base; X, First direction; Y, Second direction; Z, Longitudinal direction. Detailed Implementation

[0026] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] Please refer to Figures 1 to 7A burr detection assembly for electrode cutting surfaces includes a feeding mechanism 1, a transport mechanism 2, a positioning mechanism 4, and a detection mechanism 3. The feeding mechanism 1 is used to feed or move battery electrode sheets 5 away from the transport mechanism 2. The transport mechanism 2 is used to carry the battery electrode sheets 5 and reciprocate between the positioning mechanism 4 and the detection mechanism 3. The detection range of the detection mechanism 3 is located on the running path of the side of the battery electrode sheet 5 to be detected. The transport mechanism 2 includes a first linear module 21 and an alignment platform 22. The alignment platform 22 is disposed on the first linear module 21 and driven by it. A platform imaging plate 23 is disposed on the alignment platform 22. The battery electrode sheet 5 is carried on the platform imaging plate 23. In the horizontal plane, the first linear module 21 drives the alignment platform 22 to move along a first direction X. The alignment platform 22 drives the platform imaging plate 23 to translate in the first direction X and the second direction Y, and to rotate in the horizontal plane. The first direction X is perpendicular to the second direction Y. In this embodiment, the battery electrode 5 is generally rectangular. In use, the battery electrode 5 to be tested is first transferred to the carrier mechanism 2 by the feeding mechanism 1. The carrier mechanism 2 then transports the battery electrode 5 to be tested to the positioning mechanism 4. The positioning mechanism 4 includes a backlight 41 and a positioning camera 44 arranged at Z intervals along the longitudinal direction. When the carrier mechanism 2 is in the positioning mechanism 4, the side of the battery electrode 5 to be tested is located between the backlight 41 and the positioning camera 44. Specifically, in the longitudinal direction Z, the battery electrode 5 is positioned between the backlight 41 and the positioning camera 44. The positioning camera 44 takes a picture of the battery electrode 5. Then, the feeding mechanism 1 grabs the battery electrode 5 and removes it from the carrying mechanism 2, i.e., the platform imaging plate 23. The alignment platform 22 adjusts the platform imaging plate 23 so that its edge is parallel to the edge to be detected corresponding to the battery electrode 5. At this time, the battery electrode 5 is placed on the platform imaging plate 23 again. The alignment platform 22 adjusts the position of the platform imaging plate 23 again so that the edge to be detected of the battery electrode 5 placed on it is parallel to the field of view of the detection camera 31 of the detection mechanism 3. The first linear module 21 drives the alignment platform 22 to move along the first direction X to realize the imaging detection of the edge to be detected of the battery electrode 5.

[0030] like Figure 1 As shown, there are two detection mechanisms 3, corresponding to the two edges of the battery electrode 5 to be inspected. After inspecting one edge, the above steps are repeated to complete the inspection of the other edge. In this embodiment, the feeding mechanism 1, the carrying mechanism 2, the positioning mechanism 4, and the detection mechanism 3 work together to quickly detect and judge the burrs on the cut edge of the battery electrode 5, i.e., the edge to be inspected. This facilitates real-time online sampling inspection of the battery electrode 5, reduces manual intervention, helps to detect problems in a timely manner, and ensures product quality.

[0031] like Figure 4As shown, the platform imaging board 23 includes a base plate 231 and a support plate 233 arranged at Z intervals along the longitudinal direction. The base plate 231 is assembled on the alignment platform 22 and driven by it. The base plate 231 and the support plate 233 are connected by a support plate 232. The upper surface of the support plate 233 is provided with negative pressure holes for adsorbing the battery electrode 5.

[0032] like Figure 1 and Figure 3 As shown, the burr detection assembly also includes a machine base 6, the upper surface of which is parallel to the horizontal plane; the positioning mechanism 4 also includes a longitudinal support 43 and a transverse support 42 connected to each other. The longitudinal support 43 is mounted on the machine base 6, and the transverse support 42 is located at the top of the longitudinal support 43. There are four positioning cameras 44, each corresponding to one of the four apex corners of the battery electrode 5. The positioning cameras 44 are adjustablely mounted on the transverse support 42. Further, a first guide strip 421 extending along the second direction Y is provided on the side of the transverse support 42 facing the upper surface of the machine base 6. A second guide strip 422 extending along the first direction X is adjustablely mounted on the first guide strip 421. A third guide strip 423 extending along the longitudinal direction Z is adjustablely mounted on the second guide strip 422. The positioning cameras 44 are adjustablely mounted on the third guide strip 423; the first direction X, the second direction Y, and the longitudinal direction Z are all perpendicular to each other. Figure 3 and Figure 7 As shown, the first guide bar 421, the second guide bar 422 and the third guide bar 423 are all square bars.

[0033] The burr detection assembly also includes a guide block 4211, on which a first guide hole 42111 and a second guide hole 42112 are provided. The first guide hole 42111 extends along the second direction Y, and the second guide hole 42112 extends along the first direction X. A first adjustment groove 42113 is provided at the top of the longitudinal Z of the guide block 4211, and the first adjustment groove 42113 extends downward along the longitudinal Z into the first guide hole 42111. A second adjustment groove 42114 is provided at the bottom of the longitudinal Z of the guide block 4211, and the second adjustment groove 42114 extends upward along the longitudinal Z into the second guide hole 42112. In this embodiment, the first guide strip 421 is fitted into the first guide hole 42111, and the second guide strip 422 is fitted into the second guide hole 42112. Bolts are arranged at both ends of the longitudinal Z-axis of the guide block 4211 for adjusting the width of the first adjusting groove 42113 and the second adjusting groove 42114, thereby achieving a tighter connection between the guide block 4211, the first guide strip 421, and the second guide strip 422. Adjusting the width of the first adjusting groove 42113 and the second adjusting groove 42114 using bolt threads is a prior art technique.

[0034] Accordingly, such as Figure 3As shown, the upper end of the third guide bar 423 is configured with the same structure as the upper part of the guide block 4211, so as to be adjustablely assembled to the second guide bar 422. An adjustable support is adjustablely mounted on the third guide bar 423, and the positioning camera 44 is mounted on the adjustable support. Specifically, the adjustable support is sleeved on the third guide bar 423, and the tightness of the assembly structure between the adjustable support and the third guide bar 423 is adjusted by means of an adjustment groove and mounting bolts. Referring to the aforementioned assembly structure of the guide block 4211 with the first guide bar 421 and the second guide bar 422, it will not be repeated here. In this way, the relative positions of the four positioning cameras 44 can be adjusted to accommodate positioning and photography of battery electrode sheets 5 of different specifications.

[0035] like Figure 2 As shown, the detection mechanism 3 includes a camera support 32, a base plate 33, and a detection camera 31. The detection camera 31 is mounted on the base plate 33. The camera support 32 has a mounting plane parallel to the horizontal plane, and a guide groove 321 extending along the second direction Y is provided on the mounting plane. The base plate 33 has a guide protrusion 331. The base plate 33 is mounted on the mounting plane, and the guide protrusion 331 is slidably embedded in the guide. The base plate 33 can move relative to the camera support 32 along the second direction Y to approach or move away from the edge to be detected of the battery electrode 5. The running path of the edge to be detected of the battery electrode 5 is defined to extend along the first direction X, which is perpendicular to the second direction Y, and both are parallel to the horizontal plane. In this embodiment, the guide protrusion 331 and the guide groove 321 ensure the stability of the position adjustment of the detection camera 31 on the camera support 32.

[0036] Furthermore, the base plate 33 has a first oblong adjustment hole 332, the length of which is parallel to the second direction Y. A first screw hole 322 corresponding to the first oblong adjustment hole 332 is provided on the mounting plane, and several first screw holes 322 are spaced apart along the second direction Y. In this embodiment, a bolt or screw is fitted into the first oblong adjustment hole 332 and threaded into the first screw hole 322 to fix the base plate 33 to the camera support 32. The first oblong adjustment hole 332 and the first screw hole 322, when used together, enable stepless adjustment of the base plate 33 in the second direction Y.

[0037] like Figure 1 , Figure 5 and Figure 6As shown, the feeding mechanism 1 includes a first driving member 11 and a gripping member 12 disposed on the first driving member 11. The gripping member 12 includes an integrated plate 121, on which an extension frame 122 is adjustablely mounted. A suction cup 124 is adjustablely mounted on the extension frame 122 via a rotating platform 123. The suction cup 124 is used to adsorb battery electrode sheets 5. In this embodiment, the first driving member 11 is a linear module, disposed diagonally above the machine base 6. The integrated plate 121 is mounted on the first driving member 11, i.e., the linear module, and is driven by it to move along the second direction Y, so as to approach or move away from the positioning mechanism 4 in the second direction Y, thereby realizing the loading and unloading of battery electrode sheets 5 on the transport mechanism 2. It can be understood that when the feeding mechanism 1 loads and unloads battery electrode sheets 5, the transport mechanism 2 is located close to the positioning mechanism 4. The rotating platform 123 can adjust the angle of the suction cup 124, thereby adjusting the angle of the battery electrode sheet 5 on the suction cup 124.

[0038] Furthermore, the extension frame 122 is slidably connected to the integrated plate 121 via a slide rail slider assembly, and the extension frame 122 is able to move longitudinally Z relative to the integrated plate 121; the integrated plate 121 is provided with a second driving member for driving the extension frame 122 to move longitudinally Z.

[0039] In this embodiment, the second driving component includes a limiting frame plate 125 and a transmission screw 126. The limiting frame plate 125 is slidably connected to the integrated plate 121 through a slide rail slider assembly. The transmission screw 126 is rotatably mounted on the integrated plate 121 and extends along the longitudinal direction Z. The limiting frame plate 125 and the transmission screw 126 are threadedly connected. In the longitudinal direction Z, the limiting frame plate 125 is higher than the extension frame 122. A limiting block 1251 is provided on the limiting frame plate 125. A limiting stop block 1221 matching the limiting block 1251 is provided on the extension frame 122. The limiting block 1251 is located on the path of the limiting stop block 1221 moving downward along the longitudinal direction Z. A cylinder 1252 is provided on the limiting frame plate 125. The cylinder 1252 is used to drive the extension frame 122 to move along the longitudinal direction Z. The limiting plate 125 here can be driven by the transmission screw 126 to adjust its longitudinal Z-height, thereby adjusting the extension frame 122 to the extreme position of longitudinal Z-movement to adapt to different processing environments. In this embodiment, the transmission screw 126 is driven by a motor mounted on the integrated plate 121 in conjunction with a synchronous belt.

[0040] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A pole piece cut face burr detection assembly, characterized in that, The feeding mechanism is used for feeding or moving away the battery pole piece from the carrying mechanism, the carrying mechanism is used for carrying the battery pole piece to reciprocate between the positioning mechanism and the detection mechanism, and the detection range of the detection mechanism is on the running path of the edge to be detected of the battery pole piece. The carrying mechanism comprises a first linear module and a positioning platform, the positioning platform is arranged on the first linear module and is driven thereby, and a platform photographing plate is arranged on the positioning platform, and the battery pole piece is carried on the platform photographing plate. In a horizontal plane, the first linear module drives the positioning platform to move in a first direction, the positioning platform drives the platform photographing plate to move in the first direction and a second direction and rotate in the horizontal plane, and the first direction is perpendicular to the second direction.

2. The pole piece trim face burr detection assembly of claim 1, wherein, The platform photographing plate comprises a bottom plate and a carrying plate which are arranged at intervals in a longitudinal direction, the bottom plate is assembled on the positioning platform and is driven thereby, and the bottom plate and the carrying plate are connected through a support plate. An upper surface of the carrying plate is provided with a negative pressure hole for adsorbing the battery pole piece.

3. The pole piece trim face burr detection assembly of claim 1, wherein, The positioning mechanism comprises a backlight source and a positioning camera which are arranged at intervals in a longitudinal direction, and when the carrying mechanism is in the positioning mechanism, the edge to be detected of the battery pole piece is between the backlight source and the positioning camera.

4. The pole piece trim face burr detection assembly of claim 3, wherein, The burr detection assembly further comprises a machine table, and an upper surface of the machine table is parallel to a horizontal plane. The positioning mechanism further comprises a longitudinal support and a transverse support which are connected to each other, the longitudinal support is assembled on the machine table, the transverse support is arranged at a top end of the longitudinal support, the positioning camera is four in number and corresponds to four corners of the battery pole piece one by one, and the positioning camera is adjustably arranged on the transverse support.

5. The pole piece trim face burr detection assembly of claim 4, wherein, One side of the transverse support facing the upper surface of the machine table is provided with a first guide strip extending in a second direction, the first guide strip is adjustably assembled with a second guide strip extending in a first direction, the second guide strip is adjustably assembled with a third guide strip extending in a longitudinal direction, and the positioning camera is adjustably assembled on the third guide strip. The first direction, the second direction and the longitudinal direction are perpendicular to each other in pairs.

6. The pole piece trim face burr detection assembly of claim 1, wherein, The detection mechanism comprises a camera support, a seat plate and a detection camera, and the detection camera is assembled on the seat plate. The camera support is provided with an assembly plane parallel to a horizontal plane, the assembly plane is provided with a guide groove extending in a second direction, the seat plate is provided with a guide protrusion, the seat plate is assembled on the assembly plane, and the guide protrusion is slidingly embedded in the guide groove, and the seat plate can move relative to the camera support in the second direction to approach or move away from the edge to be detected of the battery pole piece. A running path of the edge to be detected of the battery pole piece extends in a first direction, the first direction is perpendicular to the second direction, and both are parallel to the horizontal plane.

7. The pole piece trim face burr detection assembly of claim 6, wherein, A first waist-shaped adjusting hole is formed in the seat plate, a length direction of the first waist-shaped adjusting hole is parallel to the second direction, the assembly plane is provided with a first screw hole corresponding to the first waist-shaped adjusting hole, and a plurality of first screw holes are arranged at intervals in the second direction.

8. The pole piece trim face burr detection assembly of claim 1, wherein, The feeding mechanism comprises a first driving member and a grabbing member arranged on the first driving member, the grabbing member comprises an integrated plate, an extension frame is adjustably arranged on the integrated plate, a suction disc is adjustably arranged on the extension frame through a rotating platform, and the suction disc is used for adsorbing the battery pole piece.

9. The pole piece trim face burr detection assembly of claim 8, wherein, The extension frame is in sliding connection with the integrated plate, and the extension frame can move longitudinally relative to the integrated plate. A second driving member is arranged on the integrated plate and used for driving the extension frame to move longitudinally.

10. The pole piece trim face burr detection assembly of claim 9, wherein, The second driving member comprises a limiting frame plate and a transmission screw rod, the limiting frame plate is in sliding connection with the integrated plate, the transmission screw rod is rotatably arranged on the integrated plate, the transmission screw rod extends longitudinally, the limiting frame plate is in threaded transmission connection with the transmission screw rod, in the longitudinal direction, the limiting frame plate is higher than the extension frame, a limiting block is arranged on the limiting frame plate, a limiting stopper matched with the limiting block is arranged on the extension frame, the limiting block is on a path of the limiting stopper moving downward in the longitudinal direction, a cylinder is arranged on the limiting frame plate, and the cylinder is used for driving the extension frame to move longitudinally.

Images