Bus bar supply device

Abstract

The invention relates to the field of solar cell stitch welding machines, in particular to a bus bar supply device which comprises a bus bar unwinding module, a bus bar bidirectional cutting module, a punching device, a bending device, a bus bar intersection distance type carrying module and three transfer positioning plates which are sequentially arranged in the Y-axis direction. The two bus bar unwinding modules are arranged at the two ends, in the X-axis direction, of one transfer positioning plate, the bus bar bidirectional cutting module is used for pulling and cutting bus bars released from the bus bar unwinding modules, the punching device and the bending device are arranged on the other two transfer positioning plates correspondingly, and the bus bar crossing type carrying module can move the bus bars. Therefore, the cut bus bars are sequentially placed on the two transfer positioning plates provided with the punching device and the bending device, and the bus bars are sequentially punched and bent. According to the embodiment of the invention, unwinding, sizing, punching and bending processes of the bus bar can be automatically completed, and the efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of solar cell stack welding machines, and in particular to a busbar supply device. Background Art

[0002] In the production of solar cells, stitch welding machines (string welding machines) are usually used. Stitch welding machines are used to transport glass plates, cell strings and bus bars, and to cut, punch, bend and weld the bus bars to the cell strings. Among them, the processes of cutting, punching and bending the bus bars are applied to the bus bar supply device.

[0003] Prior art CN 210754431 U discloses a busbar unwinding and straightening system, which is equivalent to a busbar supply device. Traditional busbar supply devices can only provide straightened and fixed-length cut busbars. However, the busbars need to be punched and bent before being welded to the battery string. Summary of the invention

[0004] The object of the present invention is to provide a busbar supply device to solve the problem that the conventional busbar supply device does not have the function of punching and bending the busbar.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A busbar supply device comprises a busbar unwinding module, a busbar bidirectional cutting module, a punching device, a bending device, a busbar cross-distance transport module and a transfer positioning plate; The number of the transfer positioning plates is at least three, and the three transfer positioning plates are arranged sequentially along the Y-axis direction, and the Y-axis is the horizontal direction; The number of the busbar unwinding modules is at least two, and the busbar unwinding modules are arranged in pairs at two ends of one of the transfer positioning plates along the X-axis direction, and are used to release the busbar to the transfer positioning plate, and the X-axis is a horizontal direction and perpendicular to the Y-axis; The busbar bidirectional cutting module is arranged between the two busbar unwinding modules in a pair, and is used to pull and cut the busbar released from the busbar unwinding module, and place the cut busbar on the transfer positioning plate; The punching device and the bending device are respectively arranged on the other two transfer positioning plates, and the busbar cross-distance handling module can adsorb and move the busbar along the Y-axis direction and the Z-axis direction, so that the cut busbars are placed in sequence on the two transfer positioning plates installed with the punching device and the bending device, so that the busbars are punched and bent in sequence, and the Z-axis is the vertical direction.

[0006] Furthermore, the busbar unwinding module comprises: a first base, an unwinding motor, an unwinding disc, a second tensioning wheel and at least one guide wheel, the rolled busbar is mounted on the unwinding disc, the unwinding disc is driven to rotate by the unwinding motor to unwind the rolled busbar, and the unwound busbar passes around the guide wheel and the second tensioning wheel according to a preset path and then is discharged; wherein, the unwinding motor is connected to the unwinding disc through a quick-insertion mechanism, the quick-insertion mechanism comprises an unwinding shaft and a quick-release nut assembly, the unwinding shaft is rotatably connected to the first base, and the axis of the unwinding shaft is arranged in a horizontal direction. One end of the unwinding shaft is connected to the output shaft of the unwinding motor, and the unwinding motor drives the unwinding shaft to rotate when working, and the other end of the unwinding shaft is suspended and faces the loading position; the unwinding disk is coaxially mounted on the outside of the unwinding shaft, and a step is formed in the middle of the unwinding shaft. The unwinding disk stops axial movement when it moves to contact the step, and the other end of the unwinding shaft is installed with the quick-release nut assembly, which is screwed in from one end of the unwinding shaft and prevents axial movement when it contacts the unwinding disk. At this time, the unwinding disk is clamped in the middle by the step and the quick-release nut assembly.

[0007] Furthermore, the busbar bidirectional cutting module comprises: a second base, and a material setting device, a cutting device, a transfer positioning plate, another cutting device and another material setting device installed on the second base and arranged in sequence along the length direction of the second base; the transfer positioning plate is arranged in the central area of ​​the second base, located between the two busbar unwinding modules, and the transfer positioning plate has a narrow and long rectangular top wall, and the length direction is parallel to the horizontal X-axis direction, which is used to support and position the cut busbar; a side of the transfer positioning plate is provided with a A bidirectional material pulling device for pulling materials in two directions, the end of the busbar released by the busbar unwinding module passes through a material fixing device and a cutting device in sequence and is preset in the working position of the bidirectional material pulling device, the bidirectional material pulling device is used to pull the busbar back and forth between the two material fixing devices and the two cutting devices, the material fixing device is used to clamp the busbar when the busbar is pulled to a predetermined length so that the busbar is straightened under the pulling action of the bidirectional material pulling device, the cutting device is used to cut the straightened busbar, and the cut busbar is placed on the transfer positioning plate to wait for transportation.

[0008] Further, the punching device includes a first Z-axis driver, a mold frame, a punch and a die; the first Z-axis driver and the mold frame are fixedly connected to a third base, the first Z-axis driver has an actuator that moves along the Z-axis direction, and the Z-axis is vertically arranged; the die is fixed on the mold frame, the die is located directly below the punch, the die has a die hole that passes through itself along the Z-axis direction, the punch can move along the Z-axis direction on the mold frame, the punch has a punch that matches the die hole, and the end of the busbar is arranged between the die and the punch; the punch is transmission-connected to the actuator of the first Z-axis driver, and the first Z-axis driver drives the punch to move up and down, so that the punch is inserted into the die hole of the die, thereby punching a through hole at the end of the busbar.

[0009] Furthermore, the bending device includes a bending movable plate, a second Z-axis drive, a bending static plate, a bending pressure plate and a pressure plate drive; the bending movable plate can be movably connected to the third base along the Z-axis direction and is close to the end of the bus bar. When the bending movable plate is at the lowest position, the top wall of the bending movable plate is at the same height as the top wall of the transfer positioning plate; the bending static plate is fixedly connected to the third base and is away from the end of the bus bar. The top wall of the bending static plate is at the same height as the top wall of the transfer positioning plate; the bending pressure plate is movably connected to the third base and is located above the bending static plate, and is used to cooperate with the bending static plate to clamp the upper and lower surfaces of the bus bar; the second Z-axis drive is fixedly connected on the third base, and the actuator of the second Z-axis driver is connected to the bending movable plate, the second Z-axis driver is used to drive the bending movable plate to move vertically along the Z-axis direction, when the bending movable plate is at the highest position, the end of the bus bar is bent to a suitable angle; the pressure plate driver is connected to the third base, and the actuator of the pressure plate driver is transmission-connected to the bending pressure plate, the pressure plate driver is used to drive the bending pressure plate to move, when the bending movable plate moves upward, the bending pressure plate cooperates with the bending static plate to clamp the upper and lower surfaces of the bus bar, so that the end of the bus bar is bent, when the bending movable plate moves downward, the bending pressure plate avoids the space directly above the bus bar.

[0010] Furthermore, the busbar cross-distance handling module includes a manipulator and a substrate installed on the actuator of the manipulator, the manipulator has an actuator that can move along the Y-axis and the Z-axis, the substrate is vertically arranged and installed with a slide rail extending along the X-axis, a plurality of sliders that can move along the X-axis are installed on the slide rail, each of the sliders is installed with a plurality of suction cups, the plurality of suction cups are arranged along the X-axis, the working ends of the suction cups are suspended below the substrate and are vertically arranged downward, a plurality of X-axis drivers are also installed on the substrate, the actuator of each of the X-axis drivers is connected to one of the sliders, and the X-axis driver is used to move the slider so that the suction cup moves accordingly.

[0011] Furthermore, the bus bar multi-line variable motion transport module includes: at least one welding pad extending along the X-axis in the length direction, and a Y-axis driver driving the welding pad to move along the Y-axis direction, the welding pad includes a crossbeam, at least one pad module and a plurality of suction cups, the pad module is installed on the top of the crossbeam, the suction cup and the vacuum tube group connecting each of the suction cups are installed inside the crossbeam, the air inlet of the suction cup passes through the pad module and is arranged above the pad module, the air inlet of the suction cup is elastic, and when the bus bar is placed on the pad module, the air inlet of the suction cup is pressed down to a height parallel to the bottom wall of the pad module.

[0012] Furthermore, the transfer positioning plate includes a slat and a plurality of positioning column groups installed on the slat and distributed along the X-axis direction, each of the positioning column groups includes two positioning columns arranged in pairs along the Y-axis direction, and the Y-axis direction is horizontal and perpendicular to the X-axis direction.

[0013] Furthermore, the slat is provided with a plurality of bolt hole groups corresponding to each of the positioning columns, each of the bolt hole groups includes a row of bolt holes distributed along the C-axis direction, the C-axis is horizontally arranged and between the X-axis and the Y-axis, and when the positioning columns are installed inside different bolt holes in the C-axis direction, the distance between two adjacent positioning columns in the Y-axis direction can be changed.

[0014] Furthermore, a groove which is recessed downward and surrounds the bolt hole group is provided on the plate, and the groove is used to embed the bottom end of the positioning column so that the side wall of the busbar can contact the outer peripheral surface of the positioning column without contacting the lower edge of the positioning column.

[0015] Compared with the prior art, this application has the following beneficial effects: The embodiments of the present invention can automatically complete the unwinding, sizing, punching and bending processes of the busbar, with a high degree of automation and high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 A three-dimensional diagram of a busbar unwinding module according to an embodiment of the present invention; Figure 2 It is a left view of the busbar unwinding module according to an embodiment of the present invention; Figure 3 It is a front view of a busbar unwinding module according to an embodiment of the present invention; Figure 4 for Figure 3 Cross-sectional view in the AA direction; Figure 5 It is an assembly diagram of a quick-release nut assembly according to an embodiment of the present invention; Figure 6 It is an assembly diagram of a rotating arm and a spring latch according to an embodiment of the present invention; Figure 7 A three-dimensional diagram of a busbar bidirectional cutting module according to an embodiment of the present invention; Figure 8 A three-dimensional diagram of the partial structure (bidirectional material pulling device, material setting device, and cutting device) of a busbar bidirectional cutting module according to an embodiment of the present invention; Fig. 9 A three-dimensional diagram of the partial structure (transfer positioning plate, two-way material pulling device) of the busbar bidirectional cutting module according to an embodiment of the present invention; Fig.10 A top view of a partial structure (a bidirectional material pulling device, a material setting device, and a cutting device) of a busbar bidirectional cutting module according to an embodiment of the present invention; Fig.11 for Fig.10 Cross-sectional view in the AA direction; Fig.12 for Fig.11 A local enlarged view of point B; Fig.13 for Fig.11 A local enlarged view of point C; Fig.14 A three-dimensional diagram of a material setting device according to an embodiment of the present invention; Fig.15 A three-dimensional diagram of a material setting device from another perspective according to an embodiment of the present invention; Fig.16 A three-dimensional diagram of a cutting device according to an embodiment of the present invention; Fig.17A three-dimensional diagram of an embodiment of the present invention; Fig.18 A top view of a local position of an embodiment of the present invention; Fig.19 for Fig.18 Cross-sectional view in the AA direction; Fig. 20 for Fig.18 Cross-sectional view in the BB direction; Fig.21 for Fig.18 The cross-sectional view in CC direction; Fig. 22 A three-dimensional diagram of an embodiment of the present invention; Fig.23 This is a three-dimensional diagram of an embodiment of the present invention after the robot arm is hidden; Fig.24 is a three-dimensional diagram of a first sliding block according to an embodiment of the present invention; Fig.25 is a three-dimensional diagram of a second sliding block according to an embodiment of the present invention; Fig.26 It is a structural schematic diagram of an embodiment of the present invention; The numbers in the figure represent the following: 31-first base; 311-horizontal slide; 312-horizontal slider; 3121-handle; 3122-manual latch; 313-second latch seat; 314-vertical slide; 315-vertical slider; 316-first detection device; 317-second detection device; 32-unwinding motor; 321-belt transmission mechanism; 33-quick insertion mechanism; 331-unwinding shaft; 3311-step; 332-quick release nut assembly; 3321-sleeve; 3322-round hole; 3323-slide; 3324-slide; 3325-first long hole; 3326- Semi-threaded portion; 3327-guide column; 3328-guide hole; 333-rotating arm; 3331-swing arm; 3332-second long hole; 334-spring latch; 3341-first latch seat; 3342-first latch; 3343-annular flange; 3344-latch cap; 3345-second spring; 335-conical sleeve; 3351-cylindrical sleeve; 3352-sleeve cap; 336-third spring; 34-unwinding disk; 341-first groove; 35-tensioning wheel; 36-guide wheel; 361-first guide groove; 362-second guide groove; 41-second base; 411-first guide wheel; 412-second guide wheel; 413-first guide roller group; 414-second guide roller group; 42-transfer positioning plate; 421-slat; 422-positioning column group; 423-bolt hole group; 424-second groove; 43-bidirectional material pulling device; 431-first X-axis driver; 432-bidirectional nozzle mechanism; 4321-material pulling bottom plate; 4322-material pulling nozzle; 4325-driving rod; 4326-driven rod; 4327-nose rotating device Axis; 4323-bidirectional nozzle driver; 4324-elastic rubber strip; 44-feeding device; 441-feeding base plate; 442-feeding nozzle; 443-feeding push rod; 443-unidirectional nozzle driver; 45-cutting device; 451-second X-axis driver; 452-cutter module; 4521-cutting base plate; 4522-cutting tool; 4523-tool push rod; 4524-push rod driver; 4525-first elastic member; 453-detection switch; 454-busbar bracket; 51-third base; 53-punching device; 531-first Z-axis driver; 532-die frame; 533-punch; 5331-punch; 534-die; 5341-die hole; 535-pressing plate; 5351-avoidance hole; 536-guide mechanism; 537-spring; 538-waste trough; 54-bending device; 541-bending movable plate; 542-second Z-axis driver; 543-bending static plate; 544-bending pressing plate; 545-pressing plate driver; 5451-single-axis cylinder; 5452-third rotating shaft; 5453-fourth rotating shaft; 61-manipulator; 62-base plate; 63-slide rail; 64-X-axis driver; 641-cylinder mounting seat; 65-first slider; 651-driving arm; 6511-convex strip; 6512-countersunk hole; 652-first driven plate; 6521-first groove; 653-suction cup mounting seat; 6531-second groove; 6532-first long hole; 6533-second long hole; 6534-first suction cup; 6535-second suction cup; 66-second slider; 661-second driven plate; 662-transmission rod; 6621-third long hole; 663-first suction cup mounting rod; 6631-third suction cup; 664-second suction cup mounting rod; 6641-fourth suction cup. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] refer to Fig.26 , the X-axis is the horizontal direction, the Y-axis is the horizontal direction and perpendicular to the X-axis, and the Z-axis is the vertical direction.

[0020] In the production of solar cells, stitch welding machines (string welding machines) are usually used. Stitch welding machines are used to transport glass plates, cell strings and bus bars, and to cut, punch, bend and weld the bus bars to the cell strings. Among them, the processes of cutting, punching and bending the bus bars are applied to the bus bar supply device.

[0021] refer to Figure 1 The bus bar supply device includes: a bus bar unwinding module 3, a bus bar bidirectional cutting module 4, a bus bar punching and bending module 5, and a bus bar cross-distance handling module 6, wherein the bus bar unwinding module 3 is arranged at both ends of the bus bar bidirectional cutting module 4 along the X-axis direction, the bus bar bidirectional cutting module 4 and the bus bar punching and bending module 5 are arranged sequentially along the Y-axis direction, the bus bar cross-distance handling module 6 can absorb and move the bus bar along the Y-axis direction and the Z-axis direction, and the bus bar bidirectional cutting module 4 and the bus bar punching and bending module 5 are both equipped with a transfer positioning plate 42 for temporarily placing the bus bar.

[0022] The working method of the busbar supply device comprises the following steps: Step 1: The two busbar unwinding modules 3 release the rolled busbars at both ends of the busbar bidirectional cutting module 4 along the X-axis direction. The busbar bidirectional cutting module 4 performs the process of pulling and cutting the busbars, so that the rolled busbars are straightened and cut. The cut busbars are placed on the transfer positioning plate 42 close to the busbar bidirectional cutting module 4.

[0023] Step 2: The busbar cross-distance transport module 6 moves the busbar to the transfer positioning plate 42 close to the busbar punching and bending module 5. The busbar punching and bending module 5 performs punching and bending processes on the busbar. Then, the busbar cross-distance transport module 6 moves the busbar to the next workstation.

[0024] Structural description of busbar unwinding module: Combination Figure 1 , Figure 2 , Figure 3 The busbar unwinding module of the present invention is shown in a stereoscopic view, a side view and a front view. The busbar unwinding module includes: a first base 31, an unwinding motor 32, an unwinding disc 34, a second tensioning wheel 35 and at least one guide wheel 36. The rolled busbar (not shown in the figure) is installed on the unwinding disc 34. The unwinding disc 34 is driven to rotate by the unwinding motor 32 to unwind the rolled busbar. The unwound busbar passes around the guide wheel 36 and the second tensioning wheel 35 according to a preset path and then is discharged.

[0025] In a common stitch welding machine, a pulling device (not shown in the figure) is provided at the discharge position of the busbar, and the pulling device pulls the busbar to the slitting process.

[0026] Among them, the similarities between the present invention and the prior art are not listed here for the time being. Figure 4 The connection structure between the unwinding motor 32 and the unwinding disk 34 shown in the figure is different in that the unwinding motor 32 and the unwinding disk 34 are connected by a quick-insertion mechanism 33. This design enables the staff to quickly replace the unwinding disk 34 as a whole, thereby increasing the speed of replacing the wound busbar.

[0027] Specifically, the quick-insertion mechanism 33 includes: a reel-out shaft 331 and a quick-release nut assembly 332 .

[0028] The unwinding shaft 331 is rotatably connected to the first base 31, and the axis of the unwinding shaft 331 is arranged in the horizontal direction. One end of the unwinding shaft 331 is connected to the output shaft of the unwinding motor 32 through the belt transmission mechanism 321. When the unwinding motor 32 is working, it drives the unwinding shaft 331 to rotate. The other end of the unwinding shaft 331 is suspended and faces the loading position, which is used to install the unwinding disk 34.

[0029] The unwinding disc 34 is coaxially mounted on the outside of the unwinding shaft 331. A step 3311 is formed in the middle of the unwinding shaft 331. The unwinding disc 34 stops axial movement when it moves to contact the step 3311. A quick-release nut assembly 332 is installed at the other end of the unwinding shaft 331. The quick-release nut assembly 332 is screwed in from one end of the unwinding shaft 331 and stops axial movement when it contacts the unwinding disc 34. At this time, the unwinding disc 34 is clamped in the middle by the step 3311 and the quick-release nut assembly 332.

[0030] Furthermore, in order to quickly install and remove the quick-release nut assembly 332, and then quickly replace the unwinding disk 34, so as to finally achieve the purpose of quickly replacing the wound busbar, the quick-release nut assembly 332 is provided. Figure 4 and Figure 5 The quick-release nut assembly 332 includes a sleeve 3321 and two sliders 3324 .

[0031] The positional relationship between the sleeve 3321, the slider 3324 and the unwinding shaft 331 is as follows: the sleeve 3321 is provided with a through circular hole 3322, and the slider 3324 is provided with a through first elongated hole 3325. The through directions of the first elongated hole 3325 and the circular hole 3322 are parallel to the axis of the unwinding shaft 331, and the length direction of the first elongated hole 3325 is arranged along the radial direction of the unwinding shaft 331. When the circular hole 3322 and the first elongated hole 3325 are mounted on the outside of the unwinding shaft 331, the circular hole 3322 allows the sleeve 3321 to move along the axial direction of the unwinding shaft 331, and the first elongated hole 3325 allows the slider 3324 to move along the axial and radial directions of the unwinding shaft 331.

[0032] The connection relationship between the sleeve 3321, the slider 3324 and the unwinding shaft 331: a slide groove 3323 is formed on the sleeve 3321, and the slide groove 3323 extends along the radial direction of the unwinding shaft 331. The two sliders 3324 are symmetrical around the axis of the unwinding shaft 331. The two sliders 3324 are both slidably connected to the slide groove 3323. A semi-threaded portion 3326 is provided at one end of each first long hole 3325. When the two sliders 3324 move away from each other so that the ends of the two first long holes 3325 are both in contact with the surface of the unwinding shaft 331, the two semi-threaded portions 3326 are combined into a complete threaded hole, and the threaded hole is threadedly connected to the end of the unwinding shaft 331.

[0033] Connection between the quick-release nut assembly 332 and the unwinding shaft 331: Preferably, each of the two sliders 3324 is connected with a guide column 3327, and the guide column 3327 is plugged into the guide hole 3328 on the other slider 3324, so that the two sliders 3324 can be plugged into each other, and a first spring (not shown in the figure) is installed on the guide column 3327 between the two sliders 3324 to drive the two sliders away from each other. The first spring makes the semi-threaded portions 3326 of the two sliders 3324 always form a synthetic threaded hole when there is no external force, so as to prevent the unwinding disk 34 from moving axially through the threaded connection between itself and the unwinding shaft 331.

[0034] Separation of the quick-release nut assembly 332 from the unwinding shaft 331: When the operator squeezes the two sliders 3324 to bring the two sliders 3324 closer to each other, the two semi-threaded portions 3326 are separated from the unwinding shaft 331. At this time, the circular hole 3322 and the first long hole 3325 allow the quick-release nut assembly 332 to move along the axial direction of the unwinding shaft 331, thereby allowing the operator to quickly install or remove the quick-release nut assembly 332 and the unwinding disk 34.

[0035] Furthermore, in order to achieve the purpose of stably outputting torque to the unwinding disk 34 by the unwinding shaft 331, Figure 4 and Figure 6 The quick-insertion mechanism 33 also includes: a second rotating arm 333 and at least one spring latch 334 .

[0036] The second rotating arm 333 is connected to the unwinding shaft 331 by bolts, and rotates synchronously with the unwinding shaft 331. The second rotating arm 333 extends along the radial direction of the unwinding shaft 331. The spring latch 334 is connected to the second rotating arm 333 by bolts. A plurality of first grooves 341 are formed on the side of the unwinding disk 34 facing the spring latch 334. When the spring latch 334 is inserted into one of the first grooves 341, the second rotating arm 333 can transmit the torque of the unwinding shaft 331 to the unwinding disk 34 through the spring latch 334, so that the unwinding disk 34 and the unwinding shaft 331 rotate synchronously.

[0037] Specifically, the second rotating arm 333 is installed at the step 3311 position of the unwinding shaft 331, and the second rotating arm 333 includes two swing arms 3331, each swing arm 3331 is connected to a spring pin 334, and a second long hole 3332 is formed on the swing arm 3331, and the length direction of the second long hole 3332 is set along the radial direction of the unwinding shaft 331.

[0038] The spring latch 334 includes a first latch seat 3341, a first latch pin 3342 and a second spring 3345. The first latch seat 3341 is connected to the swing arm 3331 by bolts. The first latch seat 3341 is provided with a pin hole, and the axis of the pin hole is parallel to the axis of the unwinding shaft 331. The first latch pin 3342 is inserted inside the pin hole, so that the first latch pin 3342 can move along the axis direction parallel to the unwinding shaft 331. When the unwinding disk 34 is mounted on the unwinding shaft 331 and the unwinding disk 34 is fixed by the quick-release nut assembly 332, the first latch pin 3342 is inserted into the first groove 341 on the end face of the unwinding disk 34.

[0039] An annular flange 3343 extending radially outward is formed at one end of the first latch pin 3342 facing the unwinding disk 34, and a latch cap 3344 is connected to the other end of the first latch pin 3342. The annular flange 3343 and the latch cap 3344 are distributed on both sides of the first latch seat 3341, so that the first latch pin 3342 cannot be separated from the first latch seat 3341.

[0040] The second spring 3345 is sleeved on the outside of the first latch 3342, and the two ends of the second spring 3345 abut against the first latch seat 3341 and the annular flange 3343, so that after the unwinding disk 34 contacts the first latch 3342, the second spring 3345 always applies elastic force to the first latch 3342, thereby preventing the first latch 3342 from being separated from the first groove 341.

[0041] Furthermore, in order to achieve the purpose of automatically centering the unwinding disc 34 after it is mounted on the outside of the unwinding shaft 331, so that the unwinding disc 34 can be accurately aligned with the axis of the unwinding shaft 331 without additional operation, the unwinding disc 34 is combined with the unwinding shaft 331 to realize the purpose of automatically centering the unwinding disc 34 after it is mounted on the outside of the unwinding shaft 331. Figure 4 The quick-insertion mechanism 33 also includes: at least two tapered sleeves 335 and a third spring 336 .

[0042] The unwinding disc 34, two tapered sleeves 335 and a third spring 336 are all mounted on the outside of the unwinding shaft 331, wherein the unwinding disc 34 has no direct contact with the unwinding shaft 331, and the two tapered sleeves 335 are both connected to the unwinding shaft 331 and rotate synchronously with the unwinding shaft 331, wherein one tapered sleeve 335 directly contacts the step 3311 of the unwinding shaft 331, and the other tapered sleeve 335 abuts against the quick-release nut assembly 332 through the third spring 336, and under the elastic force of the third spring 336, the two tapered sleeves 335 are respectively clamped at both ends of the unwinding disc 34, and the tapered surfaces of the tapered sleeves 335 contact the axial hole of the unwinding disc 34, and the two ends of the unwinding disc 34 are aligned with the axis of the unwinding shaft 331 through the guiding action of the two tapered surfaces.

[0043] In summary, combined with Figure 4 , Figure 5 , Figure 6 The quick-insertion mechanism 33 includes: a reeling shaft 331, a quick-release nut assembly 332, a sleeve 3321, two sliders 3324, a second rotating arm 333, at least one spring latch 334, at least two tapered sleeves 335 and a third spring 336.

[0044] Among them, in order to remove the unwinding reel 34 more quickly, an outer conical sleeve 335 is coaxially connected to the quick-release nut assembly 332, and the conical sleeve 335 has a cylindrical sleeve 3351 that matches the circular hole 3322 of the sleeve 3321. The end of the cylindrical sleeve 3351 is connected to a sleeve cap 3352, and the sleeve cap 3352 allows the cylindrical sleeve 3351 to move axially inside the circular hole 3322 without being able to separate from the circular hole 3322.

[0045] This design allows the operator to remove the quick-release nut assembly 332, a conical sleeve 335 and the third spring 336 at the same time, thereby quickly replacing the unwinding disc 34, so that the unwinding shaft 331 can stably output torque to the unwinding disc 34, and after the unwinding disc 34 is mounted on the outside of the unwinding shaft 331, it can be automatically centered, so as to ultimately achieve the purpose of quickly replacing the wound bus bar.

[0046] Combination Figure 1 , Figure 2 and Figure 3 When the busbar is used up, the staff needs to replace the rolled busbar. To facilitate the staff's operation, a horizontal slide 311 is provided on the first base 31 on which the unwinding motor 32, the guide wheel 36 and the second tensioning wheel 35 are installed. The horizontal slide 311 is provided with a horizontal slider 312 that can slide along the axial direction of the unwinding motor 32. The unwinding motor 32 is installed on the horizontal slider 312, so that the unwinding motor 32 and the unwinding disk 34 can move along their own axial direction to move from the working position to the material changing position.

[0047] Furthermore, a handle 3121 and a manual latch 3122 are provided on the side of the horizontal slider 312 facing the material changing position. The manual latch 3122 has a second latch that can slide vertically, and the second latch corresponds to the second latch seat 313 on the first base 31. The handle 3121 is convenient for the staff to pull out the horizontal slider 312 to move the unwinding motor 32 and the unwinding disk 34 to the material changing position. After replacing the rolled bus bar, the staff can push the horizontal slider 312 back to its original position, and then insert the second latch into the second latch seat 313. At this time, the unwinding motor 32 and the unwinding disk 34 are fixed in the working position.

[0048] Combination Figure 1 , Figure 2 and Figure 3 The second tensioning wheel 35 can move up and down to adjust and balance the unwinding tension and the discharging tension of the busbar, avoiding the tilting, bending and deformation caused by unwinding the rolled busbar to the straight busbar, ensuring the straightness and transmission stability of the busbar, improving the yield rate, ensuring the welding quality of solar cells, and improving production efficiency.

[0049] The second tensioning wheel 35 is configured as a gravity second tensioning wheel 35, and the unwound busbar passes around its lower side. As the unwinding tension and the discharging tension of the busbar change, the second tensioning wheel 35 moves upward or downward, wherein the unwinding tension refers to the tension of the busbar transmitted upstream of the second tensioning wheel 35 along the conveying direction of the busbar, that is, the tension of the busbar on the unwinding side; the discharging tension refers to the tension of the busbar transmitted downstream of the second tensioning wheel 35 along the conveying direction of the busbar, that is, the tension of the busbar on the discharging side.

[0050] When the discharge tension increases / unwinding tension decreases, the upward support force of the busbar on the gravity second tensioning wheel 35 increases, and the gravity second tensioning wheel 35 moves upward to reduce the tension of the busbar on the discharge side and balance the tension of the busbar on the unwinding side with the tension of the busbar on the discharge side.

[0051] On the contrary, when the discharge tension decreases / the unwinding tension increases, the upward support force of the busbar on the gravity second tensioning wheel 35 decreases, and the gravity second tensioning wheel 35 moves downward to increase the tension of the busbar on the discharge side and balance the tension of the busbar on the unwinding side with the tension of the busbar on the discharge side.

[0052] The gravity second tensioning wheel 35 moves up and down to adjust and balance the tension of the busbar on the unwinding side and the tension of the busbar on the discharging side, avoiding the occurrence of tilting, bending deformation, etc. caused by unwinding the rolled busbar to the straight busbar, ensuring the transmission stability and straightness of the busbar, improving the yield rate, ensuring the welding quality of solar cells, and improving production efficiency.

[0053] Furthermore, a vertical slide 314 is arranged on the first base 31 along the vertical direction, and the second tensioning wheel 35 is connected to the vertical slide 314 through the vertical slider 315. The vertical slider 315 can slide up and down along the vertical slide 314, so that the vertical slider 315 can drive the second tensioning wheel 35 to move up and down along the vertical slide 314. Under the support of the bus bar tension on the unwinding side and the bus bar tension on the discharging side, the gravity second tensioning wheel 35 can move up and down along the vertical slide 314 to adjust and balance the bus bar tension on the unwinding side and the bus bar tension on the discharging side.

[0054] In this embodiment, two guide wheels 36 are provided, and the axes of the two guide wheels 36 are located in the same horizontal plane. The second tensioning wheel 35 is located below the two guide wheels 36 . The bus bar passes through the two guide wheels 36 and then the second tensioning wheel 35 from the unwinding disk 34 .

[0055] Furthermore, combined with Figure 1 The two guide wheels 36 are respectively provided with a first guide groove 361 and a second guide groove 362. The unwound bus bar passes through the first guide groove 361, the second guide groove 362 and the second tensioning wheel 35 in sequence and then enters the slitting process. The width of the first guide groove 361 is greater than the width of the second guide groove 362, and the width of the second guide groove 362 is not less than the width of the bus bar.

[0056] Therefore, during the process from unwinding to tensioning the busbar, the busbar can be gradually straightened under the guidance of the first guide groove 361 and the second guide groove 362 to further prevent the busbar from tilting and bending.

[0057] Furthermore, while the gravity second tensioning wheel 35 moves up and down to balance the bus tension on the unwinding side and the bus tension on the discharging side, the control of the bus unwinding speed and the discharging speed is also a problem to be solved urgently, wherein the bus unwinding speed refers to the transmission speed of the bus on the unwinding side, and the bus discharging speed refers to the transmission speed of the bus on the discharging side.

[0058] In actual production, in order to further prevent the busbar from bending and ensure the straightness of the busbar, the unwinding speed of the busbar is usually lower than the discharging speed. However, if the speed ratio of the discharging and unwinding is too large, the excessive length difference between the busbar on the discharging side and the busbar on the unwinding side may easily cause the busbar on the discharging side to be stretched, and the length after slitting may be shorter than the predetermined length. If the speed ratio of the discharging and unwinding is too small, the busbar on the discharging side may easily bend, and the straightness of the busbar on the discharging side may not be guaranteed.

[0059] Therefore, only when the ratio between the discharge speed and the unwinding speed is maintained within an optimal range, can the busbar be further effectively prevented from bending and the straightness of the busbar be ensured.

[0060] To this end, combined Figure 2 The busbar unwinding module also includes a first detection device 316, which is used to detect the position information of the second tensioning wheel 35 to determine the relationship between the busbar unwinding speed and the discharging speed. There is no need to determine the unwinding and discharging speed ratio based on manual detection, which is convenient to use. The staff or controller can adjust the busbar unwinding / discharging speed according to the position information of the second tensioning wheel 35 detected by the first detection device 316, thereby improving the unwinding and straightening efficiency of the busbar.

[0061] Specifically, when the second tensioning wheel 35 is positioned upward, it indicates that the busbar discharge and unwinding speed ratio is relatively large; when the second tensioning wheel 35 is positioned downward, it indicates that the busbar discharge and unwinding speed ratio is relatively small.

[0062] The first detection device 316 detects the position information of the second tensioning wheel 35 to obtain a first result and a second result, wherein the first result is that the first detection device 316 detects the second tensioning wheel 35, and the position of the second tensioning wheel 35 is biased upward / inclined downward; the second result is that the first detection device 316 does not detect the second tensioning wheel 35, and the position of the second tensioning wheel 35 is biased downward / inclined upward.

[0063] Furthermore, at least two first detection devices 316 are arranged along the length direction of the vertical slide 314, and at least two first detection devices 316 are arranged at intervals in the vertical direction. When the first detection device 316 located on the upper side detects the position information of the second tensioning wheel 35 and obtains the first result, it means that the position of the second tensioning wheel 35 is too high, and the speed ratio of discharging and unwinding is too large; when the first detection device 316 located on the lower side detects the position information of the second tensioning wheel 35 and obtains the first result, it means that the position of the second tensioning wheel 35 is too low, and the speed ratio of discharging and unwinding is too small.

[0064] Preferably, the first detection device 316 is a micro-motion sensor, and two first detection devices 316 are arranged along the length direction of the vertical slide 314. The two first detection devices 316 correspond to the two ends of the vertical slide 314 respectively. Specifically, when the first detection device 316 corresponding to the upper end of the vertical slide 314 detects the position information of the second tensioning wheel 35 and obtains the first result, it means that the position of the second tensioning wheel 35 is too high, and the speed ratio of discharging and unwinding is too large; when the first detection device 316 corresponding to the lower end of the vertical slide 314 detects the position information of the second tensioning wheel 35 and obtains the first result, it means that the position of the second tensioning wheel 35 is too low, and the speed ratio of discharging and unwinding is too small; when the first detection device 316 corresponding to the middle part of the vertical slide 314 detects the position information of the second tensioning wheel 35 and obtains the first result, the speed ratio of discharging and unwinding is within the optimal range.

[0065] Furthermore, the busbar unwinding module also includes a controller, a first detection device 316 and an unwinding motor 32 are electrically connected to the controller, the first detection device 316 is electrically connected to the input end of the controller, and the unwinding motor 32 is electrically connected to the output end of the controller. The first detection device 316 sends the detected position information of the second tensioning wheel 35 to the controller, and the controller sends a control instruction for adjusting the rotation speed to the unwinding motor 32 according to the received position information, so as to adjust the unwinding speed of the busbar, and then adjust the speed ratio of the busbar discharge and unwinding, so that the speed ratio of the busbar discharge and unwinding is maintained within the optimal range, effectively preventing the busbar from bending and ensuring the straightness of the busbar.

[0066] Specifically, when the controller receives the first result sent by the first detection device 316 corresponding to the upper end of the vertical slide 314, it sends a control instruction to increase the rotation speed to the unwinding motor 32, so as to increase the unwinding speed of the bus bar and reduce the speed ratio of the bus bar discharge and unwinding; when the controller receives the first result sent by the first detection device 316 corresponding to the lower end of the vertical slide 314, it sends a control instruction to reduce the rotation speed to the unwinding motor 32, so as to reduce the unwinding speed of the bus bar and increase the speed ratio of the bus bar discharge and unwinding; when the controller receives the first result sent by the first detection device 316 corresponding to the middle part of the vertical slide 314, the controller does not send a control instruction to adjust the rotation speed to the unwinding motor 32, so as to maintain the existing speed ratio of the bus bar discharge and unwinding.

[0067] Furthermore, combined with Figure 3 At least one second detection device 317 is provided on one side of the vertical guide wheel 36 , and the second detection device 317 is used to detect the bus bar bypassing the guide wheel 36 to obtain the third result and the fourth result.

[0068] Among them, the third result is that the second detection device 317 detects the bus bar, indicating that the bus bar is normally transmitted from unwinding to discharging; the fourth result is that the second detection device 317 does not detect the bus bar, indicating that the bus bar is not discharged normally.

[0069] Preferably, the first detection device 316 is a metal proximity sensor.

[0070] Structural description of busbar bidirectional cutting module: refer to Figure 7 The busbar bidirectional cutting module includes a second base 41 , and a transfer positioning plate 42 , two material setting devices 44 , two cutting devices 45 and a bidirectional pulling device 43 installed on the second base 41 .

[0071] Along the length direction of the second base 41, a busbar unwinding module, a material setting device 44, a cutting device 45, a two-way pulling device 43, another cutting device 45, another material setting device 44 and another busbar unwinding module are sequentially arranged, wherein the transfer positioning plate 42 is arranged directly below the two-way pulling device 43, and the busbar unwinding module is not shown in the figure.

[0072] The bidirectional pulling device 43 pulls the busbar back and forth between the two material fixing devices 44 and the two cutting devices 45. The busbar is straightened under the clamping and pulling action of the bidirectional pulling device 43 and the material fixing device 44. The cutting device 45 cuts off the straightened busbar. The cut busbar is placed on the transfer positioning plate 42, waiting for the busbar handling module to move it away. One reciprocating action of the bidirectional pulling device 43 can cut two busbars, thereby doubling the pulling and cutting efficiency of the busbar.

[0073] Specifically, refer to Figure 7 , Figure 8 and Fig. 9 .

[0074] The transfer positioning plate 42 is disposed in the central area of ​​the second base 41, between the two busbar unwinding modules, and has a narrow rectangular top wall, and the length direction is parallel to the horizontal X-axis direction, and is used to support and position the cut busbars.

[0075] The bidirectional material pulling device 43 includes a first X-axis driver 431 and a bidirectional clamping mechanism 432 installed on the actuator of the first X-axis driver 431. The bidirectional clamping mechanism 432 is driven by the first X-axis driver 431 to move linearly back and forth above the transfer positioning plate 42. The bidirectional clamping mechanism 432 can clamp and release the busbar from two directions. When the bidirectional clamping mechanism 432 is located at one end of the transfer positioning plate 42, the bidirectional clamping mechanism 432 clamps a busbar from a busbar unwinding module and passes through the first X-axis The driver 431 pulls the busbar to the transfer positioning plate 42. At this time, the bidirectional clamping mechanism 432 is located at the other end of the transfer positioning plate 42. Then the bidirectional clamping mechanism 432 directly clamps a busbar from another busbar unwinding module, and pulls the busbar to the transfer positioning plate 42 in the opposite direction through the action of the first X-axis driver 431. Compared with the traditional busbar cutting module, the bidirectional clamping mechanism 432 can pull a busbar of twice the length in one reciprocating action, thereby greatly improving the pulling efficiency of the busbar.

[0076] Two material fixing devices 44 are symmetrically arranged at the two ends of the transfer positioning plate 42 along the X-axis direction. The rolled busbar is released toward the material fixing device 44 through the busbar unwinding module. The material fixing device 44 is used to clamp the busbar when the bidirectional pulling device 43 pulls the busbar of a predetermined length, so that the busbar stops unwinding. At this time, the two ends of the busbar are clamped by the bidirectional pulling device 43 and the material fixing device 44 respectively, and the bidirectional pulling device 43 applies a force to the busbar away from the material fixing device 44, so that the busbar between the two is straightened, so that it is easy to be cut at a fixed length.

[0077] The two cutting devices 45 are respectively arranged between each material fixing device 44 and the transfer positioning plate 42, including a second X-axis driver 451 and a cutting module 452 installed on the execution part of the second X-axis driver 451. The cutting module 452 is used to cut the busbar in a straightened state. The second X-axis driver 451 is used to drive the cutting module 452 to approach the material fixing device 44 on the side after the busbar is cut off, so that the broken end of the busbar is exposed in front of the cutting module 452, so as to facilitate clamping when the two-way pulling device 43 is reset. When the broken end of the busbar is pulled to a preset position by the two-way pulling device 43 and the free end of the busbar is fixed by the material fixing device 44, the second X-axis driver 451 drives the cutting module 452 away from the material fixing device 44 on the side, and then cuts the busbar.

[0078] In addition, reference Fig.14 and Fig.15 A first guide wheel 411, a second guide wheel 412, a first guide roller group 413 and a second guide roller group 414 are sequentially arranged between the busbar unwinding module and the fixing device 44. The axes of the first guide wheel 411 and the second guide wheel 412 are arranged along the Y-axis direction, the Y-axis direction is horizontal and perpendicular to the X-axis direction, the first guide roller group 413 includes two guide rollers whose axes are arranged along the Y-axis direction and arranged side by side along the Z-axis direction, the second guide roller group 414 includes two guide rollers whose axes are arranged along the Z-axis direction and arranged side by side along the Y-axis direction, and the Z-axis direction is vertical.

[0079] The rolled busbar starts from the busbar unwinding module, is guided by the first guide wheel 411 , the second guide wheel 412 , the first guide roller group 413 and the second guide roller group 414 in sequence, and enters the material setting device 44 .

[0080] For the specific structure of the transfer positioning plate 42, please refer to Fig. 9 As shown in the enlarged partial view, the transfer positioning plate 42 includes a slat 421 and a plurality of positioning column groups 422 installed on the slat 421 and distributed along the X-axis direction. Each positioning column group 422 includes two positioning columns arranged in pairs along the Y-axis direction. The cut bus bar is placed on the slat 421, and the two sides of the bus bar respectively abut against the outer circumferential surfaces of the two positioning columns to achieve the positioning of the bus bar.

[0081] In addition, the distance between the two positioning columns can be adjusted. In this embodiment, the positioning columns are bolts, and a plurality of bolt hole groups 423 corresponding to each positioning column are provided on the slat 421. Each bolt hole group 423 includes a row of bolt holes distributed along the C-axis direction. The C-axis is horizontally arranged and between the X-axis and the Y-axis. By installing the positioning columns inside different bolt holes in the C-axis direction, the distance between two adjacent positioning columns in the Y-axis direction can be changed, thereby adapting to bus bars of different widths.

[0082] In addition, a second groove 424 is provided on the strip 421, which is recessed downward and surrounds the bolt hole group 423. The second groove 424 is used to embed the bottom end of the positioning column so that the side wall of the busbar can contact the outer peripheral surface of the positioning column without contacting the lower edge of the positioning column, thereby avoiding burrs on the lower edge of the positioning column affecting the positioning of the busbar, or avoiding the verticality of the positioning column affecting the positioning of the busbar.

[0083] For the specific structure of the bidirectional nozzle mechanism 432, refer to Fig. 9 , Fig.10 and Fig.11 The bidirectional nozzle mechanism 432 includes a material pulling base plate 4321, two material pulling nozzles 4322 and a bidirectional nozzle driver 4323. The material pulling base plate 4321 is fixedly connected to the execution part of the first X-axis driver 431. The two material pulling nozzles 4322 are respectively arranged on both sides of the material pulling base plate 4321 along the X-axis direction. The bidirectional nozzle driver 4323 is fixedly connected to the material pulling base plate 4321. The execution part of the bidirectional nozzle driver 4323 is transmission-connected to the two material pulling nozzles 4322, so that the two material pulling nozzles 4322 move synchronously and in opposite directions.

[0084] Specifically, refer to Fig.11The material drawing clamp 4322 includes a relatively long driving rod 4325, a relatively short driven rod 4326 and a clamp rotating shaft 4327, wherein one end of the driving rod 4325 is connected to one end of the driven rod 4326 and the two are relatively perpendicular, the clamp rotating shaft 4327 is arranged at the connection between the driving rod 4325 and the driven rod 4326, the clamp rotating shaft 4327 is connected to the material drawing bottom plate 4321 so that the material drawing clamp 4322 is rotatably connected to the material drawing bottom plate 4321, and the bidirectional clamp driver 4323 adopts an actuator arranged along the X-axis direction. The bidirectional clamp driver 43 The actuator of 23 is connected to the driving rod 4325 through a slide groove arranged along the Z-axis direction, so that the linear motion of the actuator of the bidirectional clamping nozzle driver 4323 along the X-axis direction can be converted into the rotational motion of the driving rod 4325 around the X-axis, and the driven rod 4326 rotates following the driving rod 4325. When the driving rod 4325 on one side of the pulling base plate 4321 approaches the pulling base plate 4321 to clamp the bus bar, the driving rod 4325 on the other side of the pulling base plate 4321 moves away from the pulling base plate 4321 to release the bus bar, so that the two pulling nozzles 4322 can alternately clamp and release the bus bar.

[0085] Furthermore, in order to improve the friction between the material pulling nozzle 4322, the material pulling bottom plate 4321 and the bus bar, Fig.12 An elastic rubber strip 4324 is embedded in the side of the material pulling base plate 4321 facing the material pulling nozzle 4322. When the material pulling nozzle 4322 approaches the material pulling base plate 4321, the bus bar presses the elastic rubber strip 4324 under the extrusion of the material pulling nozzle 4322. The elastic rubber strip 4324 is clamped in the middle by the bus bar and the material pulling base plate 4321. At this time, there is a large friction between the elastic rubber strip 4324 and the bus bar, thereby increasing the friction between the material pulling base plate 4321 and the bus bar.

[0086] For the specific structure of the metering device 44, refer to Fig.11 , Fig.14 , Fig.15 The material fixing device 44 includes a material fixing base plate 441, a material fixing nozzle 442 and a one-way nozzle driver 43. The material fixing base plate 441 is fixedly connected to the second base 41, and the one-way nozzle driver 43 is fixedly connected to the material fixing base plate 441. The execution part of the one-way nozzle driver 43 is connected to a material fixing nozzle 442 so that the material fixing nozzle 442 rotates to approach or move away from the material fixing base plate 441, thereby performing the action of clamping and releasing the bus bar.

[0087] Specifically, the structure of the material fixing device 44 is roughly the same as that of the bidirectional clamping nozzle mechanism 432. The material fixing nozzle 442 also includes a driving rod 4325, a driven rod 4326 and a clamping nozzle shaft 4327, and the positions and connection relationships of the three are consistent. Under the action of the unidirectional clamping nozzle driver 43, the material fixing nozzle 442 approaches or moves away from the material fixing base plate 441, thereby clamping or releasing the bus bar.

[0088] For the specific structure of the cutter module 452, refer to Fig.11 , Fig.13 , Fig.16 The cutting tool module 452 includes a cutting base plate 4521 , a cutting tool 4522 , and a push rod driver 4524 connected to the cutting tool 4522 via a tool push rod 4523 .

[0089] Among them, the tool push rod 4523 can be rotatably connected to the cutting base plate 4521, the push rod driver 4524 adopts a cylinder, and the tool push rod 4523 is connected to the actuator of the push rod driver 4524 through a vertical slide groove, so that the linear motion of the actuator of the push rod driver 4524 can be converted into the rotational motion of the tool push rod 4523, and then the tool push rod 4523 drives the cutting tool 4522 to approach the cutting base plate 4521, so that the cutting tool 4522 cuts off the bus bar located on the cutting base plate 4521.

[0090] Among them, the cutting tool 4522 can be connected to the tool push rod 4523 by rotational motion or linear motion. One end of the cutting tool 4522 has a blade, and the other end of the cutting tool 4522 is connected to the tool push rod 4523 through a first elastic member 45245. The first elastic member 45245 is preferably a spring. The tool push rod 4523 and the cutting tool 4522 are provided with grooves for constraining the position of the spring. The first elastic member 45245 located between the tool push rod 4523 and the cutting tool 4522 always has an internal force to extend itself, so that the blade of the cutting tool 4522 always has an internal force to move in a direction away from the tool push rod 4523 (in a direction close to the cutting base plate 4521).

[0091] When the blade of the cutting tool 4522 contacts the cutting base plate 4521, the tool push rod 4523 can continue to move to apply a greater thrust to the cutting tool 4522 through the first elastic member 45245, ultimately making the force between the cutting tool 4522 and the cutting base plate 4521 between the blade being destroyed and the bus bar being cut off, thereby effectively cutting off the bus bar while protecting the blade from damage.

[0092] Furthermore, the cutting device 45 also includes a detection switch 453 and a bus bar bracket 454 arranged in front of the cutting module 452 along the X-axis direction. The detection switch 453 and the bus bar bracket 454 are both installed on the actuator of the second X-axis driver 451. The height of the bus bar bracket 454 is lower than the height of the cutting base plate 4521, the height of the detection switch 453 is higher than the height of the cutting base plate 4521, and the detection switch 453 is arranged toward the bus bar bracket 454.

[0093] After the busbar is cut by the cutting tool 4522, as the second X-axis driver 451 drives the cutting tool module 452 to retreat, the broken end of the busbar moves to the busbar bracket 454. At this time, the busbar bracket 454 supports the bottom wall of the busbar to prevent the broken end of the busbar from drooping, and assists the pulling clamp 4322 to clamp the broken end of the busbar.

[0094] The detection switch 453 is preferably a metal proximity switch, which is used to detect whether there is a bus bar on the bus bar bracket 454. When the detection switch 453 detects the bus bar, the second X-axis driver 451 stops moving. At this time, the broken end of the bus bar is exactly located at the working position of the pulling clamp 4322.

[0095] In summary, combined with Figures 7 to 16 The busbar bidirectional cutting module moves the bidirectional clamping mechanism 432 through the first X-axis driver 431, and clamps the broken end of a busbar from the busbar bracket 454 in front of a cutting module 452 at one end of the slat 421, and then pulls the busbar to a predetermined length. After the busbar is clamped and tightened by the fixing device 44, the cutting device 45 cuts the busbar, and the bidirectional clamping mechanism 432 releases the busbar so that the busbar stays at the specified position on the slat 421. At this time, the bidirectional clamping mechanism 432 is at the other end of the slat 421. While the first X-axis driver 431 drives the bidirectional clamping mechanism 432 to return, the bidirectional clamping mechanism 432 can cooperate with another fixing device 44 and another cutting device 45 to complete the fixed-length cutting of another busbar, thereby exponentially improving the cutting efficiency of the busbar.

[0096] Structural description of busbar punching and bending module: refer to Fig.17 The busbar punching and bending module includes a third base 51 , and a transfer positioning plate 42 , a punching device 53 and a bending device 54 installed on the third base 51 .

[0097] The transfer positioning plate 42 is used to temporarily place the busbar and constrain the side walls of the busbar so that the busbar maintains its initial position when being punched and bent. The punching device 53 and the bending device 54 are installed on the transfer positioning plate 42 and are used to punch and bend the busbar without hindering the upward movement of the busbar.

[0098] Among them, the transfer positioning plate 42 is arranged between the busbar bidirectional cutting module and the busbar cross-distance handling module. The busbars cut to a fixed length are placed here. After the busbars are punched and bent, they are moved to the welding pad by the busbar cross-distance handling module.

[0099] refer to Fig.18 The punching and bending of the busbar are performed separately. The busbar is bent on the first transfer positioning plate 42, punched on the second transfer positioning plate 42, and waits to be transported to the busbar welding module on the third transfer positioning plate 42. It can be seen that the busbar punching and bending module includes at least two transfer positioning plates 42.

[0100] For the specific structure of the punching device 53, refer to Fig.19 and Fig. 20 The punching device 53 includes: a first Z-axis driver 531, a mold frame 532, a punch 533, and a die 534.

[0101] The first Z-axis driver 531 and the mold frame 532 are fixedly connected to the third base 51 . The first Z-axis driver 531 has an actuator that moves along the Z-axis direction, and the Z-axis is vertically arranged.

[0102] The die 534 is fixed on the die frame 532 and has a die hole 5341 that passes through the die 534 along the Z-axis direction. The punch 533 can move along the Z-axis direction on the die frame 532 and has a punch 5331 that matches the die hole 5341. The end of the bus bar is arranged between the die 534 and the punch 533.

[0103] The female die 534 is located directly below the male die 533. The first Z-axis driver 531 adopts a cylinder slide, and the male die 533 is transmission-connected to the actuator of the first Z-axis driver 531. The first Z-axis driver 531 drives the male die 533 to move up and down, so that the punch 5331 is inserted into the die hole 5341 of the female die 534, thereby punching a through hole at the end of the busbar.

[0104] In addition, in order to improve the accuracy of punching on the busbar, a pressure plate 535 is suspended under the punch 533. The pressure plate 535 is connected to the actuator of the first Z-axis driver 531 through a guide mechanism 536, so that the pressure plate 535 can slide along the Z-axis direction relative to the punch 533. The pressure plate 535 is provided with an avoidance hole 5351 for the punch 5331 to pass through, and the punch 5331 is embedded in the through hole.

[0105] A spring 537 is provided between the pressing plate 535 and the actuator of the first Z-axis driver 531. The spring 537 applies a downward force to the pressing plate 535 so that when there is no other external force, the maximum distance allowed by the guide mechanism 536 is always maintained between the pressing plate 535 and the actuator of the first Z-axis driver 531.

[0106] In addition, a waste chute 538 is provided below the die 534 to facilitate discharge of punched waste from the bottom of the die 534 .

[0107] The working method of the punching device 53 includes: Step 1: The first Z-axis driver 531 drives the punch 533 to move downward, the pressure plate 535 first contacts the bus bar, and clamps the bus bar between the pressure plate 535 and the die 534 to prevent the workpiece from moving. Then the punch 533 continues to move downward, and the punch 5331 passes through the avoidance hole 5351 on the pressure plate 535 and is inserted into the die hole 5341 in the die 534 to complete the blanking of the bus bar.

[0108] Step 2: The first Z-axis driver 531 drives the punch 533 to move upward, the punch 5331 first leaves the die hole 5341 and separates from the bus bar, then the punch 533 continues to move upward, the punch 5331 retracts into the avoidance hole 5351, then the pressure plate 535 separates from the bus bar, and the punch 5331 and the pressure plate 535 return to their initial positions.

[0109] Furthermore, in order to improve the punching efficiency of the punching device 53 , the punch 533 of the punching device 53 has two punches 5331 , and the die 534 has two die holes 5341 , so that one punching device 53 can perform punching operations on the ends of two bus bars at the same time.

[0110] Regarding the specific structure of the bending device 54, Fig.18 , Fig.21 The bending device 54 includes: a bending movable plate 541, a second Z-axis driver 542, a bending static plate 543, a bending pressure plate 544 and a pressure plate driver 545.

[0111] The bending movable plate 541 is movably connected to the third base 51 along the Z-axis direction and is close to the end of the bus bar. When the bending movable plate 541 is at the lowest position, the top wall of the bending movable plate 541 is at the same height as the top wall of the transfer positioning plate 42.

[0112] The bent static plate 543 is fixedly connected to the third base 51 and is away from the end of the bus bar. The top wall of the bent static plate 543 is at the same height as the top wall of the transfer positioning plate 42 .

[0113] The bending pressure plate 544 is movably connected to the third base 51 and is located above the bending static plate 543 , and is used to cooperate with the bending static plate 543 to clamp the upper and lower surfaces of the bus bar.

[0114] The second Z-axis driver 542 is fixedly connected to the third base 51, and the actuator of the second Z-axis driver 542 is connected to the bending movable plate 541. The second Z-axis driver 542 adopts a cylinder slide. The second Z-axis driver 542 is used to drive the bending movable plate 541 to move vertically along the Z-axis direction. When the bending movable plate 541 is at the highest position, the end of the bus bar is bent to a suitable angle.

[0115] The pressure plate driver 545 is connected to the third base 51, and the actuator of the pressure plate driver 545 is transmission-connected to the bending pressure plate 544. The pressure plate driver 545 is used to drive the bending pressure plate 544 to move. When the bending movable plate 541 moves upward, the bending pressure plate 544 cooperates with the bending static plate 543 to clamp the upper and lower surfaces of the bus bar so that the ends of the bus bar are bent. When the bending movable plate 541 moves downward, the bending pressure plate 544 avoids the space directly above the bus bar, so that the bus bar can be transported along the Z-axis direction by the bus bar cross-distance transport module.

[0116] Specifically, the bending movable plate 541 can be rotatably connected to the third base 51. Along with the rotation of the bending movable plate 541, one end of the bending pressure plate 544 can move downward to press the bus bar, or move upward to avoid the transportation path of the bus bar. The other end of the bending pressure plate 544 is connected to the pressure plate driver 545 through the third rotating shaft 5452. The pressure plate driver 545 includes a single-axis air cylinder 451, which can be rotatably connected to the third base 51 through the fourth rotating shaft 5453. The single-axis air cylinder 451 is used to drive the fourth rotating shaft 5453 to approach or move away from the third rotating shaft 5452, thereby making the bending movable plate 541 rotate forward or reverse.

[0117] The working method of the bending device 54 includes: Step 1: The pressure plate driver 545 drives the bending pressure plate 544 to rotate forward so that the busbar is pressed against the bending static plate 543, and then the second Z-axis driver 542 drives the bending movable plate 541 to move upward so that the end of the busbar is bent.

[0118] Step 2: The second Z-axis driver 542 drives the bending movable plate 541 to move downward to complete the reset action, and then the pressure plate driver 545 drives the bending pressure plate 544 to rotate in the opposite direction so that there is no obstruction directly above the busbar.

[0119] Structural description of busbar cross-distance handling module: Combination Fig. 22The busbar cross-distance handling module includes a robot 61 and a busbar adsorption module installed on the robot 61. The robot 61 has an actuator that moves along the Y-axis and the Z-axis, which is used to drive the busbar adsorption module to pass through each transfer positioning plate for placing the busbar in sequence, thereby moving the busbar from the busbar bidirectional cutting module and the busbar punching and bending module to the busbar welding pad in sequence.

[0120] Combination Fig.23 The busbar adsorption module includes: a vertically arranged substrate 62, and a slide rail 63 fixedly connected to the substrate 62 and extending along the X-axis, a plurality of sliders that can move along the X-axis are installed on the slide rail 63, and a plurality of suction cups are installed on each slider. The working end of the suction cup is suspended below the substrate 62 and arranged vertically downward. A plurality of X-axis drivers 64 are also installed on the substrate 62, and the actuator of each X-axis driver 64 is connected to a slider, and the X-axis driver 64 is used to move the slider so that the suction cup moves accordingly.

[0121] The busbar adsorption module includes at least one group of suction cups distributed along the X-axis direction. In order to improve the efficiency of carrying the busbar, preferably, the busbar adsorption module includes two groups of suction cups distributed along the X-axis direction. The two groups of suction cups are arranged side by side along the Y-axis direction. At the same time, the number of sliders remains unchanged, and each slider can move the positions of the two groups of suction cups at the same time when it moves.

[0122] The X-axis driver 64 is preferably a pneumatic cylinder, which has sensitive movements and low costs.

[0123] However, the busbars of different solar cells have different lengths, and the extension distance of the cylinder cannot be changed in real time. In order to facilitate the adjustment of the position of the cylinder, a plurality of cylinder mounting seats 641 are provided on the substrate 62. The cylinder mounting seats 641 are evenly spaced along the X-axis, thereby facilitating the staff to adjust the position of the cylinder.

[0124] At the same time, in order to facilitate the adjustment of the position of the suction cup on the slider, the slider of the present invention has also been improved accordingly. Two different sliders are installed on the substrate 62, namely Fig.24 The first slider 65 and Fig.25 A second slider 66 is shown.

[0125] Combination Fig.24 The first slider 65 includes a driving arm 651, a first driven plate 652 and a suction cup mounting seat 653 which are sequentially connected from top to bottom.

[0126] The driving arm 651 is fixedly connected to the execution part of the X-axis driver 64 , the first driven plate 652 is slidably connected to the slide rail 63 , and the suction cup mounting seat 653 is suspended below the first driven plate 652 .

[0127] A convex strip 6511 extending along the X-axis is provided at the bottom of the driving arm 651, and a third groove 6521 extending along the X-axis is provided at the top of the first driven plate 652. The convex strip 6511 is embedded in the third groove 6521 and the two are slidably matched, so that the driving arm 651 and the first driven plate 652 can slide relative to each other.

[0128] The driving arm 651 is provided with a countersunk hole 6512 which passes through the driving arm 651 and the convex strip 6511. The top of the first driven plate 652 is provided with a threaded hole located inside the third groove 6521. The bolt passes through the countersunk hole 6512 and connects to the threaded hole on the top of the first driven plate 652, so that the driving arm 651 and the first driven plate 652 are firmly connected to prevent the two from sliding relative to each other.

[0129] The relative adjustment between the driving arm 651 and the first driven plate 652 is used to meet the requirement of changing the position of the X-axis driver 64 .

[0130] A fourth groove 6531 extending along the X-axis is provided at the top of the suction cup mounting seat 653, the bottom of the first driven plate 652 is embedded in the fourth groove 6531, and the two side walls of the first driven plate 652 are against the side walls of the fourth groove 6531, so that the suction cup mounting seat 653 and the first driven plate 652 can slide relative to each other.

[0131] The suction cup mounting seat 653 is also provided with a third elongated hole 6532 extending along the X-axis. The third elongated hole 6532 passes through the suction cup mounting seat 653 and the fourth groove 6531. A threaded hole is provided at the bottom of the first driven plate 652. The bolt passes through the third elongated hole 6532 and is connected to the threaded hole at the bottom of the first driven plate 652, so that the suction cup mounting seat 653 and the first driven plate 652 are connected. Loosening the bolt can adjust the relative position of the suction cup mounting seat 653 and the first driven plate 652, and tightening the bolt can prevent the suction cup mounting seat 653 and the first driven plate 652 from sliding relative to each other.

[0132] The relative adjustment between the suction cup mounting seat 653 and the first driven plate 652 is used to meet the demand of changing the position of the suction cup.

[0133] The suction cup mounting seat 653 is also provided with a circular hole and a fourth elongated hole 6533 extending along the X-axis. The circular hole and the fourth elongated hole 6533 are respectively used to install different suction cups, such as a first suction cup 6534 installed in the circular hole and a second suction cup 6535 installed in the fourth elongated hole 6533.

[0134] The position of the first suction cup 6534 is adjusted by changing the relative position of the suction cup mounting seat 653 and the first driven plate 652 , and the position of the second suction cup 6535 is adjusted by changing its position in the fourth long hole 6533 .

[0135] Combination Fig.25The second slider 66 includes a driving arm 651 and a first driven plate 652 connected sequentially from top to bottom, and a second driven plate 661 and a transmission rod 662 connected sequentially to the first driven plate 652 along the X-axis direction, and a first suction cup mounting rod 663 and a second suction cup mounting rod 664 respectively connecting the first driven plate 652 and the second driven plate 661.

[0136] The connection relationship among the X-axis driver 64 , the driving arm 651 , and the first driven plate 652 of the second slider 66 is the same as that of the first slider 65 .

[0137] The first suction cup mounting rod 663 and the second suction cup mounting rod 664 are both provided with round holes for mounting suction cups, and the first suction cup mounting rod 663 and the second suction cup mounting rod 664 are used to mount different suction cups, such as the third suction cup 6631 mounted on the first suction cup mounting rod 663 and the fourth suction cup 6641 mounted on the second suction cup mounting rod 664.

[0138] A circular hole and a fifth elongated hole 6621 extending along the X-axis are provided on the transmission rod 662, a threaded hole corresponding to the fifth elongated hole 6621 is provided on the side wall of the first driven plate 652, and a threaded hole corresponding to the circular hole is provided on the side wall of the second driven plate 661. A bolt passes through the fifth elongated hole 6621 to connect the threaded hole on the side wall of the first driven plate 652, and a bolt passes through the circular hole to connect the threaded hole on the side wall of the second driven plate 661, so that the first driven plate 652, the transmission rod 662, and the second driven plate 661 are connected. Loosening the bolt can adjust the relative position of the first driven plate 652 and the second driven plate 661, and tightening the bolt can prevent the first driven plate 652 and the second driven plate 661 from sliding relative to each other.

[0139] The position of the third suction cup 6631 is adjusted by changing the relative position of the driving arm 651 and the first driven plate 652 , and the position of the second suction cup 6535 is adjusted by changing the relative position of the first driven plate 652 and the second driven plate 661 .

[0140] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A busbar supply device, characterized in that: It includes a busbar unwinding module, a busbar bidirectional cutting module, a punching device, a bending device, a busbar cross-distance handling module and a transfer positioning plate; The number of the transfer positioning plates is at least three, and the three transfer positioning plates are arranged sequentially along the Y-axis direction, and the Y-axis is the horizontal direction; The number of the busbar unwinding modules is at least two, and the busbar unwinding modules are arranged in pairs at two ends of one of the transfer positioning plates along the X-axis direction, and are used to release the busbar to the transfer positioning plate, and the X-axis is a horizontal direction and perpendicular to the Y-axis; The busbar bidirectional cutting module is arranged between the two busbar unwinding modules in a pair, and is used to pull and cut the busbar released from the busbar unwinding module, and place the cut busbar on the transfer positioning plate; The punching device and the bending device are respectively arranged on the other two transfer positioning plates, and the busbar cross-distance handling module can adsorb and move the busbar along the Y-axis direction and the Z-axis direction, so that the cut busbars are placed in sequence on the two transfer positioning plates installed with the punching device and the bending device, so that the busbars are punched and bent in sequence, and the Z-axis is the vertical direction.

2. A busbar supply device according to claim 1, characterized in that: The busbar unwinding module comprises: a first base, an unwinding motor, an unwinding disc, a second tensioning wheel and at least one guide wheel, the rolled busbar is mounted on the unwinding disc, the unwinding disc is driven to rotate by the unwinding motor to unwind the rolled busbar, and the unwound busbar passes around the guide wheel and the second tensioning wheel according to a preset path and then is discharged; wherein, the unwinding motor is connected to the unwinding disc through a quick-insertion mechanism, the quick-insertion mechanism comprises an unwinding shaft and a quick-release nut assembly, the unwinding shaft is rotatably connected to the first base, and the axis of the unwinding shaft is arranged in the horizontal direction, the One end of the unwinding shaft is connected to the output shaft of the unwinding motor, and the unwinding motor drives the unwinding shaft to rotate when working, and the other end of the unwinding shaft is suspended and faces the loading position; the unwinding disk is coaxially mounted on the outside of the unwinding shaft, and a step is formed in the middle of the unwinding shaft. The unwinding disk stops axial movement when it moves to contact the step, and the other end of the unwinding shaft is installed with the quick-release nut assembly, which is screwed in from one end of the unwinding shaft and prevents axial movement when it contacts the unwinding disk. At this time, the unwinding disk is clamped in the middle by the step and the quick-release nut assembly.

3. The busbar supply device according to claim 1, characterized in that: The busbar bidirectional cutting module comprises: a second base, and a material fixing device, a cutting device, a transfer positioning plate, another cutting device and another material fixing device which are installed on the second base and arranged in sequence along the length direction of the second base; the transfer positioning plate is arranged in the central area of ​​the second base, located between the two busbar unwinding modules, the transfer positioning plate has a narrow and long rectangular top wall, and the length direction is parallel to the horizontal X-axis direction, which is used to support and position the cut busbar; a pull-type plate along the X-axis direction is arranged on the side of the transfer positioning plate A two-way material pulling device for material, the end of the busbar released by the busbar unwinding module passes through a material fixing device and a cutting device in sequence and is preset in the working position of the two-way material pulling device, the two-way material pulling device is used to pull the busbar back and forth between the two material fixing devices and the two cutting devices, the material fixing device is used to clamp the busbar when the busbar is pulled to a predetermined length so that the busbar is straightened under the pulling action of the two-way material pulling device, the cutting device is used to cut the straightened busbar, and the cut busbar is placed on the transfer positioning plate to wait for transportation.

4. A busbar supply device according to claim 3, characterized in that: The bidirectional material pulling device includes a first X-axis drive and a bidirectional clamping mechanism installed on the actuator of the first X-axis drive. The bidirectional clamping mechanism is driven by the first X-axis drive to move linearly back and forth above the transfer positioning plate. The bidirectional clamping mechanism can clamp and release the bus bar from two directions. When the bidirectional clamping mechanism is located at one end of the transfer positioning plate, the bidirectional clamping mechanism clamps a bus bar from the outlet of one bus bar unwinding module and pulls the bus bar to the transfer positioning plate through the action of the first X-axis drive. At this time, the bidirectional clamping mechanism is located at the other end of the transfer positioning plate, and then the bidirectional clamping mechanism directly clamps a bus bar from the outlet of another bus bar unwinding module and pulls the bus bar to the transfer positioning plate in the opposite direction through the action of the first X-axis drive.

5. The busbar supply device according to claim 1, characterized in that: The punching device includes a first Z-axis driver, a mold frame, a punch and a die; the first Z-axis driver and the mold frame are fixedly connected to a third base, the first Z-axis driver has an actuator that moves along the Z-axis direction, and the Z-axis is vertically arranged; the die is fixed to the mold frame, the die is located directly below the punch, the die has a die hole that passes through itself along the Z-axis direction, the punch can move along the Z-axis direction on the mold frame, the punch has a punch that matches the die hole, and the end of the busbar is arranged between the die and the punch; the punch is transmission-connected to the actuator of the first Z-axis driver, and the first Z-axis driver drives the punch to move up and down, so that the punch is inserted into the die hole of the die, thereby punching a through hole at the end of the busbar.

6. The busbar supply device according to claim 1, characterized in that: The bending device includes a bending movable plate, a second Z-axis driver, a bending static plate, a bending pressure plate and a pressure plate driver; the bending movable plate is movably connected to the third base along the Z-axis direction and is close to the end of the bus bar. When the bending movable plate is at the lowest position, the top wall of the bending movable plate is at the same height as the top wall of the transfer positioning plate; the bending static plate is fixedly connected to the third base and is away from the end of the bus bar. The top wall of the bending static plate is at the same height as the top wall of the transfer positioning plate; the bending pressure plate is movably connected to the third base and is located above the bending static plate, and is used to cooperate with the bending static plate to clamp the upper and lower surfaces of the bus bar; the second Z-axis driver is fixedly connected to the third base, and the actuator of the second Z-axis driver is connected to the bending movable plate, and the second Z-axis driver is used to drive the bending movable plate to move vertically along the Z-axis direction. When the bending movable plate is at the highest position, the end of the bus bar is bent to a suitable angle; The pressure plate driver is connected to the third base, and the actuator of the pressure plate driver is transmission-connected to the bending pressure plate. The pressure plate driver is used to drive the bending pressure plate to move. When the bending movable plate moves upward, the bending pressure plate cooperates with the bending static plate to clamp the upper and lower surfaces of the bus bar, so that the end of the bus bar is bent. When the bending movable plate moves downward, the bending pressure plate avoids the space directly above the bus bar.

7. The busbar supply device according to claim 1, characterized in that: The busbar cross-distance handling module includes a robot and a substrate installed on the actuator of the robot, the robot has an actuator that can move along the Y-axis and the Z-axis, the substrate is vertically arranged and installed with a slide rail extending along the X-axis, a plurality of sliders that can move along the X-axis are installed on the slide rail, each of the sliders is installed with a plurality of suction cups, and the plurality of suction cups are arranged along the X-axis, the working ends of the suction cups are suspended below the substrate and are vertically arranged downward, and a plurality of X-axis drivers are also installed on the substrate, each of the actuators of the X-axis drivers is connected to a slider, and the X-axis driver is used to move the slider so that the suction cup moves accordingly.

8. The busbar supply device according to claim 1, characterized in that: The transfer positioning plate includes a slat and a plurality of positioning column groups installed on the slat and distributed along the X-axis direction. Each positioning column group includes two positioning columns arranged in pairs along the Y-axis direction, and the Y-axis direction is horizontal and perpendicular to the X-axis direction.

9. The busbar supply device according to claim 8, characterized in that: The slat is provided with a plurality of bolt hole groups corresponding to each of the positioning columns, each of the bolt hole groups includes a row of bolt holes distributed along the C-axis direction, the C-axis is horizontally arranged and between the X-axis and the Y-axis, and when the positioning columns are installed inside different bolt holes in the C-axis direction, the distance between two adjacent positioning columns in the Y-axis direction can be changed.

10. The busbar supply device according to claim 9, characterized in that: The strip is provided with a groove which is recessed downward and surrounds the bolt hole group, and the groove is used to embed the bottom end of the positioning column so that the side wall of the busbar can contact the outer peripheral surface of the positioning column without contacting the lower edge of the positioning column.

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