Polymer soft package battery cell side sealing tool

Abstract

The utility model discloses a side sealing tool for a polymer soft package battery cell. The side sealing tool comprises a base, the end socket assembly comprises a fixed end socket assembly arranged on the base and a movable end socket assembly which is oppositely and movably arranged above the fixed end socket assembly; the feeding plate assembly comprises a feeding plate and a driving assembly, the feeding plate is arranged on one side of the base and can move in the direction close to or away from the sealing head assembly, the driving assembly drives the feeding plate to move, and a positioning assembly used for placing and fixing a to-be-packaged battery cell is arranged on the feeding plate. According to the feeding device, the product quality can be improved in the production process, the safety and reliability brought by manual operation can be improved, and the problems that in the prior art, a battery cell is manually placed and pressed on a feeding plate and then manually pushed to a packaging position, so that the battery cell is prone to inclining, the packaging effect is affected, and hands are prone to being scalded by a sealing head assembly are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packaging, in particular to a side sealing tool for a polymer soft-pack battery cell. Background Art

[0002] In recent years, with the rapid development of the new energy vehicle industry and the mobile electronic equipment industry, batteries have developed rapidly, especially soft-pack batteries, which are favored due to their good safety performance, light weight, high capacity, high energy density, low internal resistance, and flexible design. The market occupancy rate continues to increase, and it has broad market prospects.

[0003] As one of the core components of new energy vehicles, the battery module has very high requirements for its production process. As one of the important components of the battery module, it goes without saying that the packaging of the soft-pack battery cell also needs to ensure high quality and safety.

[0004] In the prior art, the side sealing device generally requires manual placement of the battery on a loading plate, and then manually pressing and pushing it to the packaging position. After the packaging is completed, the packaged battery is manually pulled back to the initial position. This side sealing device, because it adopts a hand-pushing method, can easily push the battery askew during the pushing process, which ultimately leads to poor packaging quality. In addition, there are safety hazards. The hand can easily touch the head during the pushing process, causing the hand to be burned or crushed. In addition, the existing side sealing device is provided with debugging screws on the head base for debugging uneven seals, but the debugging structure of this structure can easily deform the top of the head base and debugging is time-consuming. Therefore, in order to solve the above problems, the utility model is provided. Utility Model Content

[0005] In view of at least one of the above-mentioned technical problems, the purpose of the utility model is to provide a side sealing tool for polymer soft-pack battery cells, which can improve the product quality during the production process and the safety and reliability brought by manual operation, and it is also convenient and quick to debug uneven seals.

[0006] The technical solution of the utility model is:

[0007] The purpose of the utility model is to provide a polymer soft-pack battery side sealing tool, comprising:

[0008] Pedestal;

[0009] A head assembly, comprising a fixed head assembly arranged on the base and a movable head assembly relatively and movably arranged above the fixed head assembly;

[0010] The loading plate assembly comprises a loading plate which is arranged on one side of the base and can move towards or away from the head assembly, and a driving assembly which drives the loading plate to move. The loading plate is provided with a positioning assembly for placing and fixing the battery cells to be packaged.

[0011] Preferably, a downwardly sunken recess is opened in the middle of the base, the driving assembly is arranged in the recess, and the loading plate is suspended above the recess and connected to the driving end of the driving assembly.

[0012] Preferably, the driving assembly includes a first cylinder arranged along the moving direction of the loading plate and capable of being extended and retracted along the moving direction of the loading plate, a cylinder seat fixed in the recess for fixedly installing the first cylinder, and a connecting seat arranged on the piston rod of the first cylinder, and the other end of the connecting seat is fixedly connected to the loading plate.

[0013] Preferably, it also includes a guiding mechanism disposed between the base and the loading plate for guiding the movement of the loading plate.

[0014] Preferably, the guiding mechanism includes a guiding portion provided on the upper surface of the convex portion on both sides of the concave portion and extending along the moving direction of the loading plate, and a movable portion provided at the bottom of the loading plate and movably cooperated with the guiding portion.

[0015] Preferably, the guiding part is a slide rail, and the movable part is a slider.

[0016] Preferably, the positioning assembly includes a baffle bar which is arranged on the end surface of the loading plate facing the head assembly and protrudes from the upper surface of the loading plate, a baffle plate which is spaced apart from the baffle bar is provided at a position relative to the baffle bar, and two limiting blocks which are opposite to and spaced apart from each other are provided between the baffle bar and the baffle plate, and the baffle bar, the baffle plate and the two limiting blocks define a positioning space for placing and fixing the battery cells to be packaged.

[0017] Preferably, the base includes a plate-shaped seat body and two fixing plates which are opposite to and spaced apart from each other on the seat body, and a movable space for the movable head assembly to be installed and moved is defined between the two fixing plates.

[0018] Preferably, the fixed head assembly includes a first head connection block fixed on the base, a first head fixing block provided on the first head connection block, a first heat dissipation block provided between the first head connection block and the first head fixing block, and a first head installed on the first head fixing block;

[0019] The movable head assembly includes a cylinder connecting plate, a second head connecting block arranged at the lower end of the cylinder connecting plate, a second head fixing block arranged below the second head connecting block, a second heat dissipation block arranged between the second head connecting block and the second head fixing block, a bearing seat with two ends respectively fixed to the upper ends of the two fixing plates, a linear bearing fixedly arranged on the bearing seat, an optical axis slidingly matched with the linear bearing, a second cylinder with a bottom end fixedly arranged on the bearing seat, a limit plate connected to the piston rod of the second cylinder and the upper end of the optical axis, and a second head connected to the second head fixing block, and the cylinder connecting plate is connected to the lower end of the optical axis;

[0020] Heating pipes are disposed in both the first end-sealing fixing block and the second end-sealing fixing block.

[0021] Preferably, it further comprises a first debugging component provided on the first head connection block and located on both sides of the first head, any of the first debugging components comprising a first debugging limit nut fixed to the first head connection block and a first debugging limit rod threadedly matched with the first debugging limit nut; and

[0022] A second debugging component is arranged on the second head connecting block and located on both sides of the second head and corresponds one to one with the first debugging component. Any of the second debugging components includes a second debugging limit nut fixed to the second head connecting block and a second debugging limit rod threadedly matched with the second debugging limit nut.

[0023] Compared with the prior art, the advantages of the utility model are:

[0024] The utility model discloses a side sealing tool for polymer soft-pack battery cells, in which a loading plate is arranged to be movable close to or away from a head assembly. When in use, the battery cells to be packaged are manually placed and fixed on the loading plate, and then a driving assembly is used to drive the loading plate to move close to the head assembly, and when the loading plate reaches the packaging position, the head assembly performs the packaging operation. After the packaging is completed, the driving assembly drives the loading plate to move away from the head assembly to reset, and then the packaged battery cells are manually removed from the loading plate. This can improve the product quality during the production process and the safety and reliability brought by manual operation, and solves the problem in the prior art that the battery cells are manually placed and pressed on the loading plate and then manually pushed to the packaging position, which causes the battery cells to be easily skewed and affects the packaging effect, and the hands are easily burned by the head assembly. It is also convenient and quick to debug uneven seals. The structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1A schematic diagram of the three-dimensional structure of a polymer soft-pack battery cell side sealing tool at one angle according to an embodiment of the utility model;

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the polymer soft-pack battery cell side sealing tooling from another angle according to an embodiment of the utility model;

[0028] Figure 3 It is a schematic diagram of the rear structural view of the polymer soft-pack battery cell side sealing tooling according to an embodiment of the utility model.

[0029] Among them: 10, base; 11, seat body; 111, concave part; 112, convex part; 12, fixed plate; 20, loading plate assembly; 21, loading plate; 211, positioning assembly; 2111, baffle; 2112, baffle; 2113, limit block; 22, driving assembly; 221, first cylinder; 222, cylinder seat; 223, connecting seat; 23, guide mechanism; 231, slide rail; 232, slider; 30, head assembly; 31, fixed head assembly; 311, first head connecting block; 312, first head fixing block; 313, first heat dissipation block; 314. First end cap; 32. Movable end cap assembly; 321. Cylinder connecting plate; 322. Second end cap connecting block; 323. Second end cap fixing block; 324. Second heat sink; 325. Second end cap; 326. Bearing seat; 327. Second cylinder; 328. Linear bearing; 329. Optical axis; 3210. Limit plate; 33. Heating tube; 40. Debug assembly; 41. First debug component; 411. First debug nut; 412. First debug limit rod; 42. Second debug component; 421. Second debug nut; 422. Second debug limit rod. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0031] A polymer soft-pack battery cell side sealing tool according to an embodiment of the utility model, see Figures 1 to 3, including a base 10, a head assembly 30 and a loading plate assembly 20. The head assembly 30 and the loading plate assembly 20 are both arranged on the base 10. The loading plate assembly 20 is used to place and fix the soft-pack battery cells to be packaged and move them to the packaging position to perform side sealing and move out of the packaging position after the side sealing is completed. The head assembly 30 is arranged at the packaging position and is used to perform side sealing operations on the soft-pack battery cells to be packaged that are placed and fixed on the loading plate assembly 20. The head assembly 30 includes two head assemblies 30 arranged opposite to each other up and down, one of which is a fixed head assembly 31 and the other is a movable head assembly 32. The loading plate assembly 20 includes a loading plate 21 that is driven to move close to or away from the head assembly 30 and for the battery cells to be packaged, and a driving assembly 22 for driving the loading plate 21 to move. The polymer soft-pack battery cell side sealing tool of the embodiment of the utility model is configured to have a loading plate 21 that can be moved close to or away from the head assembly 30. When in use, the battery cell to be packaged is manually placed and fixed on the loading plate 21, and then the driving assembly 22 is used to drive the loading plate 21 to move close to the head assembly 30, and when the loading plate 21 reaches the packaging position, the head assembly 30 performs the packaging operation. After the packaging is completed, the driving assembly 22 drives the loading plate 21 away from the head assembly 30 to reset, and then the packaged battery cell is manually removed from the loading plate 21. This can improve the product quality during the production process and the safety and reliability brought by manual operation, and solves the problem in the prior art that the battery cell is manually placed and pressed on the loading plate 21 and then manually pushed to the packaging position, which causes the battery cell to be easily skewed and affects the packaging effect, and the hand is easily burned by the head assembly 30.

[0032] According to some preferred embodiments of the present utility model, Figure 1As shown, the base 10 includes a plate-shaped seat body 11 and two vertically extending fixing plates 12 that are opposite and spaced apart at one end of the seat body 11. The driving assembly 22 is fixedly mounted on the seat body 11. In order to reduce the overall height of the tooling, the cross-section of the seat body 11 is a concave shape, that is, a long strip-shaped concave portion 111 that is concave downward is provided in the middle of the seat body 11, and the two side walls of the concave portion 111 protrude above the concave portion 111 (for the convenience of description, it is represented by a convex portion 112) and the upper surfaces of the two side walls, that is, the two convex portions 112, are plane. In addition, the height of one end of the mounting fixing plate 12 is lower than the height of the convex portion 112 and is almost the same as the height of the concave portion 111. This is to facilitate the installation of the fixed head assembly 31. The loading plate 21 is suspended above the two convex portions 112 and is fixedly connected to the driving end of the driving assembly 22. The driving end moves telescopically to drive the loading plate 21 to move closer to or away from the head assembly 30. The drive assembly 22 in the embodiment of the utility model is preferably an existing conventional cylinder. Exemplarily, the drive assembly 22 includes a first cylinder 221, a cylinder seat 222 and a connecting seat 223. The piston rod of the first cylinder 221 can extend close to the head assembly 30 or retract away from the head assembly 30 along the extension direction of the recess 111. There are two cylinder seats 222, both of which are L-shaped and fixed on the recess 111 relatively and at intervals, one fixed to the end of the cylinder body of the first cylinder 221 away from the head assembly 30, and the other fixed to the end of the cylinder body of the first cylinder 221 close to the head assembly 30. The connecting seat 223 is an inverted L-shaped structure and one end is fixed on the piston rod of the first cylinder 221, and the other end is fixed to the bottom end of the loading plate 21. As an alternative embodiment, the drive assembly 22 can also be an existing conventional driver that is well known and easy to implement by those skilled in the art, such as a hydraulic drive component or an electric cylinder drive component.

[0033] According to some preferred embodiments of the present utility model, Figure 1As shown, in order to improve the stability of the linear movement of the loading plate 21 and the supporting strength of the loading plate 21, so as to prevent the loading plate 21 from contacting the upper surface of the loading plate 21 under the gravity pressure of the polymer soft-pack battery cell to be packaged and affecting the movement of the loading plate 21, a guide mechanism 23 for guiding the movement of the loading plate 21 is also provided between the two side walls of the concave portion 111, that is, the upper surface of the two convex portions 112 and the loading plate 21. Specifically, the guide mechanism 23 includes a guide portion provided on the upper surface of the two convex portions 112 and extending along the moving direction of the loading plate 21, and a movable portion provided at the bottom of the loading plate 21 and movably matched with the guide portion. In a preferred embodiment, the guide portion is a square long strip slide rail 231, and the movable portion is an inverted U-shaped slider 232 that slides with the square long strip slide rail 231. As an alternative embodiment, the guide portion and the movable portion can also be other structures that are well known and easily implemented by other technicians in this field, such as a circular guide rod and a cylindrical guide sleeve.

[0034] According to some preferred embodiments of the present utility model, Figure 1 As shown, in order to place the battery cells to be packaged on the loading plate 21 and fix them to avoid them from tilting during movement, a positioning assembly 211 is provided on the loading plate 21. Specifically, as Figure 1 As shown, the positioning assembly 211 includes two groups of structural members that are arranged oppositely and at intervals, and the two groups of structural members form a roughly quadrilateral structure, wherein one of the structural members in one group is arranged close to the head assembly 30, and the other is arranged away from the head assembly 30, and the other group of structural members is arranged adjacent to the group of structural members arranged close to and away from the head assembly 30. More specifically, the structural member close to the head assembly 30 is a long strip-shaped baffle 2111 that is arranged at one end of the loading plate 21 close to the head assembly 30 and protrudes upward and extends from the upper surface of the loading plate 21, and the structural member arranged opposite to the baffle 2111 is a long plate-shaped baffle 2112 fixed on the upper surface of the loading plate 21, and the other group of structural members is two block-shaped limit blocks 2113 that protrude upward and are fixed on the upper surface of the loading plate 21, and the two limit blocks 2113, the baffle 2111 and the baffle 2112 jointly define a positioning space for placing and fixing the battery cells to be packaged. By setting the blocking bar 2111, the blocking block and the limiting block 2113, the battery cell to be packaged is fixed in the positioning space, which can prevent the battery cell from being skewed during the movement of the loading plate 21, thereby ensuring the packaging effect of the battery cell.

[0035] According to some preferred embodiments of the present utility model, Figures 1 to 3 As shown, an installation space for installing the head assembly 30 is defined between the two fixed plates 12. Specifically, the lower part of the installation space is for installing the fixed head assembly 31, and the upper space is for installing and moving the movable head assembly 32. More specifically, as Figure 3As shown, the fixed head assembly 31 includes, from bottom to top, a first head connection block 311, a first heat dissipation block 313, a first head fixing block 312 and a first head 314. The first head connection block 311 is fixed on the base 10, and the first head 314 is detachably fixed to the first head fixing block 312 by screws. The first head fixing block 312 is provided with a heating tube 33 for heating the first head 314. The length of the first head connection block 311 is longer than the first heat dissipation block 313 and the first head fixing block 312, that is, the first heat dissipation block 313 and the first head fixing block 312 are arranged in the middle position of the first head connection block 311, so that positions are reserved on both sides of the first head connection block 311 for the subsequent setting and installation of the first debugging component 41. For the movable head assembly 32, as shown in FIG. Figure 3 As shown, the movable head assembly 32 includes a second cylinder 327, a bearing seat 326, a linear bearing 328, an optical axis 329, a limit plate 3210, a cylinder connecting plate 321, a second head connecting block 322, a second heat dissipation block 324, a second head fixing block 323 and a second head 325. The two ends of the bearing seat 326 are fixed together with the upper ends of the two fixing plates 12 to form an inverted U-shaped structure. The two second cylinders 327 are respectively fixed on the bearing seat 326 opposite to each other and at intervals. A linear bearing 328 is respectively provided on both sides of the bearing seat 326 and located on both sides of the two second cylinders 327, and in the middle of the bearing seat 326 and located between the two second cylinders 327. An optical axis 329 is slidably fitted in each linear bearing 328. The lower end of each optical axis 329 passes through the bearing seat 326 and is fixedly connected to the cylinder connecting plate 321. The upper end of each optical axis 329 is respectively fixed to the limit plate 3210. Fixed connection, the top end of the piston rod of each second cylinder 327 is fixedly connected to the limit plate 3210, the second head connection block 322, the second heat sink block 324, the second head fixing block 323 and the second head 325 are sequentially connected from top to bottom under the cylinder connection plate 321, the second head 325 is detachably mounted on the second head fixing block 323 by screws and is arranged opposite to the first head 314 up and down, and the second head fixing block 323 is provided with a heating pipe 33 for heating the second head 325. Similarly, the length of the second head connection block 322 is greater than the length of the second heat sink block 324 and the second head fixing block 323 so that the two sides of the second head connection block 322 reserve a position for the installation of the second debugging component 42. The second head 325 is driven to move upward or downward by the second cylinder 327 extending upward or retracting downward, thereby realizing the side sealing operation.

[0036] According to some preferred embodiments of the present utility model, Figure 2 and Figure 3As shown, since the polymer soft pack battery may have one side higher than the other side during the packaging process, in order to keep the polymer soft pack battery flat after packaging, it is necessary to add a debugging component 40. Specifically, as Figure 3 As shown, the debugging assembly 40 includes a first debugging component 41 disposed on the fixed head assembly 31 and a second debugging component 42 disposed on the movable head assembly 32. More specifically, as Figure 3 As shown, the first debugging component 41 includes two first debugging nuts 411 fixed at the reserved positions on both sides of the first head connection block 311 and two first debugging limit rods 412 that are respectively threaded with the two first debugging nuts 411 and protrude upward in the vertical direction. Similarly, the second debugging component 42 includes two second debugging nuts 421 fixed at the reserved positions on both sides of the second head connection block 322 and two second debugging limit rods 422 that are respectively threaded with the two second debugging nuts 421 and protrude downward in the vertical direction. The two second debugging limit rods 422 are arranged in a one-to-one correspondence with the two first debugging limit rods 412. When in use, if the polymer soft pack battery on one side is higher than the other side, that is, the seal is uneven. At this time, it is only necessary to screw the first debugging limit rod 412 and the second debugging limit rod 422 until the two sides are level. Specifically, the second debugging limit rod 422 on the high side is downward, and the second debugging limit rod 422 on the low side can be adjusted without debugging or can be adjusted upward as needed until the two sides are level. The debugging structure is simple and the debugging is convenient.

[0037] It should be noted that an in-place sensor (not shown) is also provided at the packaging position, and the in-place sensor is electrically connected to the drive assembly 22. When the in-place sensor detects that the battery cell to be packaged is loaded at the packaging position, the drive assembly 22 receives feedback and stops driving the loading plate 21 to move. In addition, the entire tooling is also provided with a control switch such as a foot switch (not shown) to control the drive assembly 22 to perform a driving action. After the packaging is completed, the foot switch is disconnected, and the drive assembly 22 drives the loading plate 21 to automatically reset. Similarly, the drive of the second cylinder 327 of the head assembly 30 can also be controlled by a control switch such as a foot switch to perform side sealing operations. Of course, a controller such as a PLC controller can also be set to automatically control the actions of the loading plate assembly 20 and the head assembly 30. The specific control circuit and principle are not limited and described, and those skilled in the art can easily know and implement them.

[0038] When using the polymer soft-pack battery cell side sealing tool of the embodiment of the utility model, the battery cell to be packaged is manually placed and fixed in the positioning space defined by the positioning component 211 of the loading plate 21, and the driving component 22 drives the loading plate 21 to move toward the head assembly 30 until it reaches the packaging position and stops, and the second cylinder 327 drives the second head 325 to press down to execute the side sealing device. After the packaging is completed, the second cylinder 327 drives the second head 325 to rise and reset, and the driving component 22 drives the loading plate 21 to move away from the head assembly 30 and reset, and the packaged battery cell can be manually removed.

[0039] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A side sealing tool for a polymer soft-pack battery cell, characterized in that: include: Pedestal; A head assembly, comprising a fixed head assembly arranged on the base and a movable head assembly relatively and movably arranged above the fixed head assembly; The loading plate assembly comprises a loading plate which is arranged on one side of the base and can move towards or away from the head assembly, and a driving assembly which drives the loading plate to move. The loading plate is provided with a positioning assembly for placing and fixing the battery cells to be packaged.

2. The tooling according to claim 1, characterized in that: A downwardly sunken recess is provided at the middle of the base, the driving assembly is arranged in the recess, and the loading plate is suspended above the recess and connected to the driving end of the driving assembly.

3. The tooling according to claim 2, characterized in that: The driving assembly includes a first cylinder arranged along the moving direction of the loading plate and capable of being extended and retracted along the moving direction of the loading plate, a cylinder seat fixed in the recess for fixedly installing the first cylinder, and a connecting seat arranged on the piston rod of the first cylinder, the other end of the connecting seat being fixedly connected to the loading plate.

4. The tooling according to claim 3, characterized in that: It also includes a guide mechanism disposed between the base and the loading plate and used for guiding the movement of the loading plate.

5. The tooling according to claim 4, characterized in that: The guide mechanism includes a guide portion which is arranged on the upper surface of the convex portion on both sides of the concave portion and extends along the moving direction of the loading plate, and a movable portion which is arranged at the bottom of the loading plate and movably cooperates with the guide portion.

6. The tooling according to claim 5, characterized in that: The guide part is a slide rail, and the movable part is a slider.

7. The tooling according to claim 1, characterized in that: The positioning assembly includes a baffle bar which is arranged on the end surface of the loading plate facing the head assembly and protrudes from the upper surface of the loading plate, a baffle plate which is arranged spaced apart from the baffle bar is provided at a position opposite to the baffle bar, and two limiting blocks which are arranged oppositely and spaced apart are provided between the baffle bar and the baffle plate, and the baffle bar, the baffle plate and the two limiting blocks define a positioning space for placing and fixing the battery cells to be packaged.

8. The tooling according to claim 1, characterized in that: The base includes a plate-shaped base body and two fixing plates which are opposite to and spaced apart from each other on the base body, and a movable space for the movable head assembly to be installed and moved is defined between the two fixing plates.

9. The tooling according to claim 8, characterized in that: The fixed head assembly includes a first head connection block fixed on the base, a first head fixing block arranged on the first head connection block, a first heat dissipation block arranged between the first head connection block and the first head fixing block, and a first head installed on the first head fixing block; The movable head assembly includes a cylinder connecting plate, a second head connecting block arranged at the lower end of the cylinder connecting plate, a second head fixing block arranged below the second head connecting block, a second heat dissipation block arranged between the second head connecting block and the second head fixing block, a bearing seat with two ends respectively fixed to the upper ends of the two fixing plates, a linear bearing fixedly arranged on the bearing seat, an optical axis slidingly matched with the linear bearing, a second cylinder with a bottom end fixedly arranged on the bearing seat, a limit plate connected to the piston rod of the second cylinder and the upper end of the optical axis, and a second head connected to the second head fixing block, and the cylinder connecting plate is connected to the lower end of the optical axis; Heating pipes are disposed in both the first end-sealing fixing block and the second end-sealing fixing block.

10. The tooling according to claim 9, characterized in that: It also includes a first debugging component arranged on the first head connection block and located on both sides of the first head, any of the first debugging components includes a first debugging limit nut fixed to the first head connection block and a first debugging limit rod threadedly matched with the first debugging limit nut; and A second debugging component is arranged on the second head connecting block and located on both sides of the second head and corresponds one to one with the first debugging component. Any of the second debugging components includes a second debugging limit nut fixed to the second head connecting block and a second debugging limit rod threadedly matched with the second debugging limit nut.

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