Secondary positioning table

Abstract

The utility model relates to the technical field of battery cell stacking, in particular to a secondary positioning table which comprises a rack, a base plate, corner columns, a conveying mechanism, a positioning mechanism, a clamping mechanism, a reference block, a lifting air cylinder and an in-place mechanism, the base plate is arranged at the top end of the rack, and the corner columns are installed at the four corners of the top end of the base plate respectively. The conveying mechanism is arranged over the base plate, the left end and the right end of the conveying mechanism are slidably connected with the corner columns correspondingly, the positioning mechanism is installed at the top end of the base plate and located below the conveying mechanism, the clamping mechanism is installed at the top end of the positioning mechanism, the top end of the clamping mechanism penetrates through the conveying mechanism, and the reference block is installed at the top end of the clamping mechanism. The top end of the base plate penetrates through the conveying mechanism, the lifting air cylinders are arranged at the left end and the right end of the base plate respectively, the driving ends of the lifting air cylinders are connected with the end of the conveying mechanism, and the in-place mechanism is installed at the tail end of the base plate. The device is simple in structural design, is compatible with battery cells of different models or specifications, and eliminates processing errors of packaging foam.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core stacking, in particular to a secondary positioning platform. Background Art

[0002] During the process of stacking batteries, neatly arranged batteries need to be placed in packaging foam. Since batteries have different blueprints or specifications, and the packaging foam itself has processing errors, the arranged batteries may not be placed in the foam smoothly. Therefore, a variable pitch device is urgently needed to adjust the distance of the arranged batteries again to be compatible with batteries of different blueprints or specifications and overcome the processing errors of the packaging foam itself. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a secondary positioning table which has a simple structural design, is compatible with batteries of different blueprints or specifications, and eliminates processing errors of packaging foam.

[0004] The utility model adopts the following technical scheme to solve the technical problem: a secondary positioning platform, comprising a frame, a base plate and corner columns, wherein the base plate is arranged at the top end of the frame, and the corner columns are respectively installed at the four corners of the top end of the base plate, and further comprising a conveying mechanism, a positioning mechanism, a clamping mechanism, a reference block, a lifting cylinder and an in-position mechanism, wherein the conveying mechanism is arranged directly above the base plate, and its left and right ends are respectively slidably connected with the corner columns, the positioning mechanism is installed at the top end of the base plate and is located below the conveying mechanism, the clamping mechanism is installed at the top end of the positioning mechanism, and its top end passes through the conveying mechanism, the reference block is installed at the top end of the clamping mechanism, and its top end passes through the conveying mechanism, the lifting cylinders are respectively arranged at the left and right ends of the base plate, and its driving end is connected to the end of the conveying mechanism, and the in-position mechanism is installed at the end of the base plate.

[0005] Furthermore, the positioning mechanism includes a pitch variable module, a pitch variable frame and a micro pitch variable assembly. The pitch variable module is horizontally installed in the middle of the top surface of the substrate, the top of the pitch variable frame is slidably connected to the bottom end of the clamping mechanism, and its bottom end is connected to the upper slider of the pitch variable module, and the micro pitch variable assembly is installed in the middle of the pitch variable frame, and its top end is connected to the middle of the bottom end of the clamping mechanism.

[0006] Furthermore, the micro-pitch variable assembly includes a slide cylinder, a cam plate, a cam and a cam frame. The slide cylinder is installed in the middle of the pitch variable frame, and the cam plate is installed at the driving end of the slide cylinder. An inclined cam hole is opened in the middle of the cam plate. The cam is embedded in the cam hole and rollingly cooperates with the cam hole. The bottom end of the cam frame is rotatably connected to the cam, and its top end is connected to the middle of the bottom end of the clamping mechanism.

[0007] Furthermore, the clamping mechanism includes a base plate, a clamping cylinder and a clamping plate, the base plate is slidably installed on the top of the variable pitch frame, the middle of the bottom end of the base plate is connected to the top of the cam frame, the reference block is installed on the top of the base plate, the clamping cylinder is installed in the middle of the top end of the base plate, the clamping plate is arranged above the conveying mechanism, and its bottom end passes through the conveying mechanism and is connected to the driving end of the clamping cylinder.

[0008] Furthermore, the conveying mechanism includes side panels, rollers, a transmission assembly and a conveying motor. The side panels are respectively arranged at the left and right ends of the base plate and are slidably connected to the corner columns. The middle part of the side panels is connected to the driving end of the lifting cylinder. The rollers are arranged between the two side panels and are evenly spaced along the length direction of the side panels. The left and right ends of the rollers are respectively rotatably connected to the top ends of the side panels. The transmission assembly and the conveying motor are installed on one of the side panels, and the conveying motor is transmission-connected to the rollers through the transmission assembly.

[0009] Furthermore, the positioning mechanism includes a bracket, a positioning plate and a positioning cylinder, the bracket is installed at the end of the base plate, the positioning plate is slidably installed at the top of the bracket, the positioning cylinder is installed at the top of the bracket, and its driving end is connected to the middle of the end of the positioning plate.

[0010] Furthermore, the positioning mechanism also includes a variable pitch stabilization component, which includes a sliding shaft, a linear bearing and a connecting strip. The sliding shaft is installed at the end of the base plate, the linear bearing is slidably sleeved on the sliding shaft, and the linear bearing is connected to the variable pitch frame through the connecting strip.

[0011] Furthermore, the conveying mechanism also includes a lifting and stabilizing component, which includes a rotating shaft, a gear and a rack. The rotating shaft is arranged at the end of the side plate and is rotatably connected to the side plate. The gear is respectively installed at the left and right ends of the rotating shaft, and the rack is installed at the end of the corner column. The gear and the rack are meshed.

[0012] Furthermore, it also includes a guiding mechanism, which includes a mounting frame and a guide plate. The mounting frame is installed at the front end of the substrate, and the guide plate is arranged above the conveying mechanism, and its bottom end passes through the conveying mechanism and is connected to the top of the mounting frame. The guide plates are evenly spaced along the length direction of the mounting frame.

[0013] Furthermore, sensors are installed at the top ends of the corner columns, and the sensors correspond to the clamping mechanism and the guiding mechanism respectively.

[0014] The beneficial effects of the utility model are:

[0015] (1) The utility model lifts the conveying mechanism by means of a lifting cylinder, so that the highest point of the roller in the conveying mechanism is higher than the top surface of the reference block, and then the conveying mechanism conveys the arranged battery cells to the positioning mechanism for aligning the battery cells, and then the clamping mechanism clamps the battery cells, and the arranged battery cells are adjusted by the positioning mechanism. After the variable pitch adjustment is completed, the lifting cylinder drives the conveying mechanism to reset, and the battery cells fall onto the reference block for subsequent grabbing by the gripper. The structural design is simple, and battery cells of different blueprints or specifications can be accurately loaded into the packaging foam, and the processing error of the packaging foam is overcome;

[0016] (2) The utility model uses a pitch-changing module to synchronously adjust the pitch of the arranged cells, and then uses a micro-pitch-changing component to individually fine-tune each cell in the arranged cells, thereby improving the accuracy of the pitch change;

[0017] (3) The utility model accurately guides the arranged battery cells into the corresponding clamping mechanism through the setting of the guiding mechanism, thereby avoiding misalignment and improving the variable pitch efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the lifting cylinder in the utility model;

[0021] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0022] Figure 4 It is a schematic diagram of the conveying mechanism in the utility model;

[0023] Figure 5 yes Figure 4 Enlarged view of middle part B;

[0024] Figure 6 It is a schematic diagram of the lifting and stabilizing assembly in the utility model;

[0025] Figure 7 yes Figure 6 Enlarged view of the middle C part;

[0026] Figure 8 It is a schematic diagram of the micro pitch changing assembly in the utility model;

[0027] Fig. 9 It is a schematic diagram of the in-place mechanism in the utility model;

[0028] Fig.10 It is a schematic diagram of the variable pitch stabilizing assembly in the utility model;

[0029] Fig.11 It is a schematic diagram of the guide mechanism in the utility model.

[0030] In the figure: 100, frame; 200, base plate; 300, corner column; 400, conveying mechanism; 410, side plate; 420, roller; 430, transmission assembly; 440, conveying motor; 450, lifting and stabilizing assembly; 451, rotating shaft; 452, gear; 453, rack; 500, positioning mechanism; 510, pitch-changing module; 520, pitch-changing frame; 530, micro pitch-changing assembly; 531, slide cylinder; 532, cam plate; 533, cam; 534, cam frame; 535, cam hole; 540, pitch-changing stabilizing assembly; 5 41. Sliding shaft; 542. Linear bearing; 543. Connecting strip; 600. Clamping mechanism; 610. Bottom plate; 620. Gripping cylinder; 630. Clamping plate; 700. Reference block; 800. Lifting cylinder; 900. Positioning mechanism; 910. Bracket; 920. Positioning plate; 930. Positioning cylinder; 1000. Guide mechanism; 1010. Mounting frame; 1020. Guide plate; 1100. Sensor; 1200. First buffer; 1300. First buffer block; 1400. Second buffer; 1500. Second buffer block. DETAILED DESCRIPTION

[0031] The present invention is now further described in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] like Figure 1-Figure 5As shown, a secondary positioning platform includes a frame 100, a base plate 200, a corner column 300, a conveying mechanism 400, a positioning mechanism 500, a clamping mechanism 600, a reference block 700, a lifting cylinder 800 and an in-position mechanism 900. The base plate 200 is arranged at the top of the frame 100, the corner columns 300 are respectively installed at the four corners of the top of the base plate 200, the conveying mechanism 400 is arranged directly above the base plate 200, and its left and right ends are respectively slidably connected with the corner columns 300, the positioning mechanism 500 is installed at the top of the base plate 200 and is located below the conveying mechanism 400, the clamping mechanism 600 is installed at the top of the positioning mechanism 500, and its top passes through the conveying mechanism 400, the reference block 700 is installed at the top of the clamping mechanism 600, and its top passes through the conveying mechanism 400, the lifting cylinder 800 is respectively arranged at the left and right ends of the base plate 200, and its driving end is connected to the end of the conveying mechanism 400, and the in-position mechanism 900 is installed at the end of the base plate 200. The conveying mechanism 400 is lifted up by the lifting cylinder 800, so that the highest point of the roller 420 in the conveying mechanism 400 is higher than the top surface of the reference block 700, and then the conveying mechanism 400 conveys the arranged battery cells to the positioning mechanism 900 to align the battery cells, and then the clamping mechanism 600 clamps the battery cells, and the arranged battery cells are adjusted by the positioning mechanism 500. After the variable pitch adjustment is completed, the lifting cylinder 800 drives the conveying mechanism 400 to reset, and the battery cells fall onto the reference block 700 for subsequent grippers (not shown in the figure) to grab. The structural design is simple, and different blueprints or specifications of battery cells can be accurately loaded into the packaging foam, and the processing error of the packaging foam is overcome. Specifically, the bottom end of the frame 100 is equipped with a foot support and casters to facilitate the movement and fixation of the frame 100; there are multiple clamping mechanisms 600, which are evenly arranged at horizontal intervals.

[0033] like Figure 2 , Figure 6 and Figure 7 As shown, the positioning mechanism 500 includes a pitch-changing module 510, a pitch-changing frame 520 and a micro pitch-changing assembly 530. The pitch-changing module 510 is horizontally installed in the middle of the top surface of the substrate 200. The top of the pitch-changing frame 520 is slidably connected to the bottom of the clamping mechanism 600, and its bottom is connected to the slider on the pitch-changing module 510. The micro pitch-changing assembly 530 is installed in the middle of the pitch-changing frame 520, and its top is connected to the middle of the bottom end of the clamping mechanism 600. The pitch-changing module 510 is used to adjust the arranged cells synchronously, and then the micro pitch-changing assembly 530 is used to fine-tune each cell in the arranged cells individually, thereby improving the accuracy of the pitch-changing. Specifically, the pitch-changing module 510 is a prior art and will not be described in detail here; the pitch-changing frame 520 and the micro pitch-changing assembly 530 are both multiple and arranged at intervals in the horizontal direction.

[0034] like Figure 7 and Figure 8As shown, the micro pitch changing assembly 530 includes a slide cylinder 531, a cam plate 532, a cam 533 and a cam frame 534. The slide cylinder 531 is installed in the middle of the pitch changing frame 520, and the cam plate 532 is installed at the driving end of the slide cylinder 531. An inclined cam hole 535 is opened in the middle of the cam plate 532. The cam 533 is embedded in the cam hole 535 and rolls with the cam hole 535. The bottom end of the cam frame 534 is rotatably connected to the cam 533, and its top end is connected to the middle of the bottom end of the clamping mechanism 600. When the micro pitch is changed, the slide cylinder 531 drives the cam plate 532 to move longitudinally, and the cam 533 rolls in the cam hole 535, and drives the clamping mechanism 600 to move slightly laterally through the cam frame 534.

[0035] like Figure 1 , Figure 5 and Figure 8 As shown, the clamping mechanism 600 includes a base plate 610, a clamping claw cylinder 620 and a clamping plate 630. The base plate 610 is slidably mounted on the top of the pitch-changing frame 520. The middle of the bottom end of the base plate 610 is connected to the top of the cam frame 534. The reference block 700 is mounted on the top of the base plate 610. The clamping claw cylinder 620 is mounted on the middle of the top end of the base plate 610. The clamping plate 630 is arranged above the conveying mechanism 400, and its bottom end passes through the conveying mechanism 400 and is connected to the driving end of the clamping claw cylinder 620. In order to ensure the stable clamping of the clamping plate 630, the front end bottom of the clamping plate 630 is slidably connected to the base plate 610 through a guide rail guide block.

[0036] like Figure 1 and Figure 4 As shown, the conveying mechanism 400 includes a side plate 410, a roller 420, a transmission assembly 430 and a conveying motor 440. The side plates 410 are respectively arranged at the left and right ends of the base plate 200 and are slidably connected to the corner column 300. The middle part of the side plate 410 is connected to the driving end of the lifting cylinder 800. The roller 420 is arranged between the two side plates 410 and is evenly spaced along the length direction of the side plates 410. The left and right ends of the roller 420 are respectively rotatably connected to the top of the side plate 410. The transmission assembly 430 and the conveying motor 440 are installed on one of the side plates 410. The conveying motor 440 is connected to the roller 420 through the transmission assembly 430. Before the conveying mechanism 400 conveys the battery cell, the lifting cylinder 800 drives the side plate 410 to rise until the highest point of the roller 420 is higher than the top surface of the reference block 700. Specifically, the transmission assembly 430 is a belt and pulley combination structure, which is a prior art, and its function is to drive all rollers 420 to rotate synchronously.

[0037] like Figure 2 and Figure 3As shown, in order to prevent rigid collision of the conveying mechanism 400 during lifting and lowering, a first buffer 1200 is installed on the top of the corner column 300, and a first buffer block 1300 is installed on the side plate 410, and the first buffer 1200 corresponds to the first buffer block 1300.

[0038] like Figure 1 and Fig. 9 As shown, the positioning mechanism 900 includes a bracket 910, a positioning plate 920 and a positioning cylinder 930. The bracket 910 is installed at the end of the substrate 200, the positioning plate 920 is slidably installed at the top of the bracket 910, and the positioning cylinder 930 is installed at the top of the bracket 910, and its driving end is connected to the middle of the end of the positioning plate 920. The positioning cylinder 930 drives the positioning plate 920 to move longitudinally to align the battery cells on the conveying mechanism 400. In order to ensure that the positioning plate 920 is in flexible contact with the battery cells, a second buffer 1400 is installed at the bottom end of the positioning plate 920, and a second buffer block 1500 is installed at the top end of the bracket 910, and the second buffer 1400 corresponds to the second buffer block 1500.

[0039] like Figure 2 , Fig. 9 and Fig.10 As shown, the positioning mechanism 500 further includes a variable pitch stabilizing assembly 540, which includes a sliding shaft 541, a linear bearing 542 and a connecting strip 543. The sliding shaft 541 is transversely mounted at the end of the base plate 200, and the linear bearing 542 is slidably sleeved on the sliding shaft 541. The linear bearing 542 is connected to the variable pitch frame 520 through the connecting strip 543. The arrangement of the variable pitch stabilizing assembly 540 ensures the stable movement of the battery cell during the variable pitch process.

[0040] like Figure 1 , Figure 6 and Fig. 9 As shown, the conveying mechanism 400 also includes a lifting and stabilizing component 450, which includes a rotating shaft 451, a gear 452 and a rack 453. The rotating shaft 451 is transversely arranged at the end of the side plate 410 and is rotatably connected to the side plate 410. The gear 452 is respectively installed at the left and right ends of the rotating shaft 451, and the rack 453 is installed at the end of the corner column 300. The gear 452 and the rack 453 are meshed.

[0041] like Figure 1 and Fig.11As shown, the secondary positioning platform also includes a guide mechanism 1000, which includes a mounting frame 1010 and a guide plate 1020. The mounting frame 1010 is installed at the front end of the substrate 200, and the guide plate 1020 is arranged above the conveying mechanism 400, and its bottom end passes through the conveying mechanism 400 and is connected to the top of the mounting frame 1010. The guide plates 1020 are evenly spaced along the length direction of the mounting frame 1010. Through the setting of the guide mechanism 1000, the arranged battery cells are accurately introduced into the corresponding clamping mechanism 600 to avoid misalignment and improve the variable pitch efficiency. Specifically, the guide plate 1020 corresponds to the clamping plate 630.

[0042] like Figure 1 As shown, a sensor 1100 is installed at the top of the corner post 300, and the sensor 1100 corresponds to the clamping mechanism 600 and the guide mechanism 1000 respectively. Through the setting of the sensor 1100, it is automatically detected whether there are batteries in the guide mechanism 1000 and the clamping mechanism 600.

[0043] During operation, the lifting cylinder 800 lifts up the conveying mechanism 400, and the arranged battery cells are conveyed from the front section to the front end of the conveying mechanism 400, that is, the guide mechanism 1000, and then guided to the clamping mechanism 600 by the guide mechanism 1000, and further conveyed to the positioning mechanism 900 by the conveying mechanism 400. The positioning mechanism 900 aligns the arranged battery cells. After the aligning, the clamping mechanism 600 clamps the battery cells, and the positioning mechanism 500 performs a distance adjustment. After the distance change is completed, the lifting cylinder 800 drives the conveying mechanism 400 to reset.

[0044] The above-mentioned implementation mode is only for illustrating the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A secondary positioning platform, comprising a frame (100), a base plate (200) and corner posts (300), wherein the base plate (200) is arranged at the top of the frame (100), and the corner posts (300) are respectively installed at the four corners of the top of the base plate (200), characterized in that: The invention also comprises a conveying mechanism (400), a positioning mechanism (500), a clamping mechanism (600), a reference block (700), a lifting cylinder (800) and a positioning mechanism (900). The conveying mechanism (400) is arranged directly above the base plate (200), and its left and right ends are respectively slidably connected to the corner column (300). The positioning mechanism (500) is installed at the top of the base plate (200) and is located below the conveying mechanism (400). The clamping mechanism (600) is installed at the top of the positioning mechanism (500), and its top passes through the conveying mechanism (400). The reference block (700) is installed at the top of the clamping mechanism (600), and its top passes through the conveying mechanism (400). The lifting cylinder (800) is respectively arranged at the left and right ends of the base plate (200), and its driving end is connected to the end of the conveying mechanism (400). The positioning mechanism (900) is installed at the end of the base plate (200).

2. The secondary positioning platform according to claim 1, characterized in that: The positioning mechanism (500) comprises a pitch-changing module (510), a pitch-changing frame (520) and a micro pitch-changing assembly (530); the pitch-changing module (510) is transversely mounted on the middle of the top surface of the base plate (200); the top end of the pitch-changing frame (520) is slidably connected to the bottom end of the clamping mechanism (600), and the bottom end thereof is connected to a slider on the pitch-changing module (510); the micro pitch-changing assembly (530) is mounted on the middle of the pitch-changing frame (520), and the top end thereof is connected to the middle of the bottom end of the clamping mechanism (600).

3. The secondary positioning platform according to claim 2, characterized in that: The micro pitch changing assembly (530) comprises a slide cylinder (531), a cam plate (532), a cam (533) and a cam frame (534); the slide cylinder (531) is mounted in the middle of the pitch changing frame (520); the cam plate (532) is mounted at the driving end of the slide cylinder (531); an inclined cam hole (535) is provided in the middle of the cam plate (532); the cam (533) is embedded in the cam hole (535) and rollingly cooperates with the cam hole (535); the bottom end of the cam frame (534) is rotatably connected to the cam (533), and the top end thereof is connected to the middle of the bottom end of the clamping mechanism (600).

4. The secondary positioning platform according to claim 3, characterized in that: The clamping mechanism (600) includes a base plate (610), a clamping cylinder (620) and a clamping plate (630). The base plate (610) is slidably mounted on the top of the variable pitch frame (520). The middle of the bottom end of the base plate (610) is connected to the top of the cam frame (534). The reference block (700) is mounted on the top of the base plate (610). The clamping cylinder (620) is mounted on the middle of the top end of the base plate (610). The clamping plate (630) is arranged above the conveying mechanism (400), and its bottom end passes through the conveying mechanism (400) and is connected to the driving end of the clamping cylinder (620).

5. The secondary positioning platform according to claim 1, characterized in that: The conveying mechanism (400) comprises a side plate (410), a roller (420), a transmission assembly (430) and a conveying motor (440); the side plates (410) are respectively arranged at the left and right ends of the base plate (200) and are slidably connected to the corner column (300); the middle part of the side plate (410) is connected to the driving end of the lifting cylinder (800); the roller (420) is arranged between the two side plates (410) and is evenly spaced along the length direction of the side plates (410); the left and right ends of the roller (420) are respectively rotatably connected to the top end of the side plate (410); the transmission assembly (430) and the conveying motor (440) are installed on one of the side plates (410); and the conveying motor (440) is transmission-connected to the roller (420) through the transmission assembly (430).

6. The secondary positioning platform according to claim 1, characterized in that: The positioning mechanism (900) comprises a bracket (910), a positioning plate (920) and a positioning cylinder (930), wherein the bracket (910) is mounted at the end of the base plate (200), the positioning plate (920) is slidably mounted on the top of the bracket (910), and the positioning cylinder (930) is mounted on the top of the bracket (910), and its driving end is connected to the middle of the end of the positioning plate (920).

7. The secondary positioning platform according to claim 2, characterized in that: The positioning mechanism (500) further comprises a variable pitch stabilizing assembly (540), wherein the variable pitch stabilizing assembly (540) comprises a sliding shaft (541), a linear bearing (542) and a connecting strip (543), wherein the sliding shaft (541) is mounted at the end of the base plate (200), the linear bearing (542) is slidably sleeved on the sliding shaft (541), and the linear bearing (542) is connected to the variable pitch frame (520) via the connecting strip (543).

8. The secondary positioning platform according to claim 5, characterized in that: The conveying mechanism (400) further comprises a lifting and stabilizing assembly (450), wherein the lifting and stabilizing assembly (450) comprises a rotating shaft (451), a gear (452) and a rack (453), wherein the rotating shaft (451) is arranged at the end of the side plate (410) and is rotatably connected to the side plate (410), wherein the gear (452) is respectively mounted at the left and right ends of the rotating shaft (451), wherein the rack (453) is mounted at the end of the corner column (300), and wherein the gear (452) and the rack (453) are meshed with each other.

9. The secondary positioning platform according to claim 1, characterized in that: The invention also comprises a guiding mechanism (1000), wherein the guiding mechanism (1000) comprises a mounting frame (1010) and a guiding plate (1020), wherein the mounting frame (1010) is mounted on the front end of the substrate (200), and the guiding plate (1020) is arranged above the conveying mechanism (400), and the bottom end thereof passes through the conveying mechanism (400) and is connected to the top end of the mounting frame (1010), and the guiding plates (1020) are evenly spaced along the length direction of the mounting frame (1010).

10. The secondary positioning platform according to claim 9, characterized in that: A sensor (1100) is installed at the top end of the corner column (300), and the sensor (1100) corresponds to the clamping mechanism (600) and the guide mechanism (1000) respectively.

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