Twelve-layer board matching device for PCB (Printed Circuit Board) pressing process

Abstract

The utility model relates to a twelve-layer board matching device for a PCB (Printed Circuit Board) press-fit process, which comprises five board matching machines and a plurality of carriers for stacking double-sided pattern inner-layer boards, each board matching machine comprises a rack, an XY linear module is arranged at the upper part of the rack, and a sucker manipulator for sucking the double-sided pattern inner-layer boards is arranged at the moving end of the XY linear module; a butt joint positioning mechanism, a roller conveying mechanism used for conveying a double-sided pattern type inner layer plate, a flat plate jacking mechanism and a plate beating positioning mechanism are installed in the middle of the machine frame, a flat plate of the flat plate jacking mechanism is located above a conveying rod of the roller conveying mechanism, and a positioning rod of the plate beating positioning mechanism is located above a flat plate of the flat plate jacking mechanism. And the roller conveying mechanisms of the five plate matching machines are sequentially connected in series. The twelve-layer board distributing device has the beneficial effects that five double-sided pattern type inner-layer boards are distributed according to a specified sequence, and the automatic production requirement of the twelve-layer board distributing device in the PCB pressing process is met.

Description

Technical Field

[0001] This utility model relates to the field of printed circuit board manufacturing technology, and in particular to a twelve-layer board assembly device for PCB lamination process. Background Technology

[0002] In current PCB manufacturing processes, multilayer PCBs are constructed by laminating alternating conductive pattern layers and insulating materials. The number of conductive pattern layers is typically three or more, and electrical interconnections between layers are achieved through metallized vias. Lamination is a crucial step in multilayer PCB manufacturing. The common practice is to sequentially stack the fabricated inner layers, bonding sheets, and copper foil, then heat-press them together. Certain designs use double-sided or multilayer boards as inner layers, undergoing multiple sequential laminations to create high-multilayer PCBs. Before lamination, the inner layers, bonding sheets, and copper foil must be stacked on a lamination tray, following the designed structure to complete the pre-stacking process. Therefore, in the manufacturing of a twelve-layer multilayer PCB, five double-sided pattern inner layers must be stacked together in a specified order, and the conductive patterns must be interconnected according to the design requirements to form a twelve-layer printed circuit board. Therefore, it is necessary to develop a 12-layer board placement device for the PCB lamination process to realize the placement of five double-sided patterned inner layer boards in a specified order, and to automate the board placement of boards in the order required for 12-layer board placement, so as to solve the automation production needs of this process. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned problems in the existing technology and to provide a 12-layer board assembly device for PCB lamination process.

[0004] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0005] A 12-layer PCB lamination process assembly device includes five assembly machines and several carriers for stacking double-sided patterned inner layer boards. Each assembly machine includes a cuboid frame with an XY linear module mounted on its upper part. The moving end of the XY linear module is equipped with a suction cup robot for picking up the double-sided patterned inner layer boards. The middle part of the frame is equipped with a docking and positioning mechanism for placing the carriers, a roller conveying mechanism for conveying the double-sided patterned inner layer boards, a flat plate lifting mechanism for lifting the double-sided patterned inner layer boards upwards, and a clapping and positioning mechanism for positioning the double-sided patterned inner layer boards. The flat plate of the flat plate lifting mechanism is located above the conveying rod of the roller conveying mechanism, and the positioning rod of the clapping and positioning mechanism is located above the flat plate of the flat plate lifting mechanism. The roller conveying mechanisms of the five assembly machines are connected in series.

[0006] The carrier includes a rectangular stainless steel base frame and a rectangular stainless steel carrier plate. The stainless steel carrier plate is welded to the top of the stainless steel base frame. The bottom of the stainless steel base frame is provided with four pin holes with a diameter of 40mm. The bottom center of the stainless steel carrier plate is provided with a crosshair with a side length of 100mm.

[0007] The XY linear module includes a first linear module in a horizontal state, a second linear module in a vertical state, and a right-angled triangular adapter frame. The first linear module is mounted on a frame, the second linear module is mounted on a moving block of the first linear module, and the vertical side of the adapter frame is mounted on the moving block of the second linear module.

[0008] The suction cup robot includes a third linear module. A first aluminum profile is installed at the tail of the outer shell of the third linear module, and a second aluminum profile is installed on the moving block of the third linear module. Multiple vacuum suction cups are respectively installed on the first aluminum profile and the second aluminum profile.

[0009] The docking and positioning mechanism includes a rectangular upright and a U-shaped fork. The upright is mounted on a frame and contains a first lead screw. A first servo motor is mounted at the bottom of the upright and is connected to the lead screw via a gear transmission pair. A set of linear guides is mounted on both sides of the front of the upright. The rear end of the fork is connected to the lead screw nut of the first lead screw and the slider of the linear guide via screws. The top of the fork is equipped with four floating centering units arranged in a rectangular array, two pairs of symmetrically arranged double-sided positioning cylinders, and two symmetrically arranged rotary clamping cylinders. The rotary clamping cylinders are located near the front end of the fork, and movable clamping blocks are mounted on the cylinder rods of the rotary clamping cylinders. Two symmetrically arranged fixed clamping blocks are mounted on the rear end of the fork.

[0010] The roller conveying mechanism includes two parallel longitudinal beams and a second servo motor. The two longitudinal beams are mounted on a frame, and multiple conveying rods perpendicular to the longitudinal beams are installed between the two longitudinal beams. Each conveying rod is equipped with multiple equally spaced conveying rollers. The second servo motor is installed at the bottom of one of the longitudinal beams, and the motor shaft of the second servo motor is connected to all the conveying rods via a synchronous belt drive pair.

[0011] The flat plate top mechanism includes two rectangular first mounting plates, a set of lifting frames, and a rectangular polyvinyl chloride (PVC) plastic plate. The two first mounting plates are mounted on the frame, and a telescopic cylinder is installed at the bottom center of each first mounting plate. The piston rod of the telescopic cylinder is connected to the lifting frame through a floating joint. The PVC plastic plate is installed at the top of the lifting frame, and the PVC plastic plate has several clearance holes that correspond one-to-one with the positions of the conveying rollers.

[0012] Furthermore, a first guide rod is installed at the bottom end of the lifting frame, and a first guide sleeve is installed on the first mounting plate, with the first guide rod fitted into the first guide sleeve.

[0013] The positioning mechanism includes two symmetrical second mounting plates and two symmetrical sliding plates. The two second mounting plates are mounted on a frame, and two second guide rods perpendicular to the second mounting plates are installed between the two second mounting plates. Each sliding plate has two second guide sleeves perpendicular to the sliding plate, and the second guide sleeves are fitted onto the second guide rods. A third servo motor is mounted on the bottom of one of the second mounting plates, and a drive pulley is mounted on the motor shaft of the third servo motor. A driven pulley is mounted on the bottom of the other second mounting plate, and a transmission belt is mounted on the drive pulley and the driven pulley. An L-shaped clamp is mounted on one side of each sliding plate, and a belt clamp is mounted on the bottom side of the L-shaped clamp. A section of the transmission belt is clamped between the belt clamp and the L-shaped clamp. Two sets of support rods are mounted on each sliding plate, and a horizontal positioning rod is mounted on the top of the support rods located on the same sliding plate. Circumvention grooves for the support rods to pass through are respectively opened on both sides of the polyvinyl chloride plastic plate.

[0014] The beneficial effects of this utility model are as follows: The logistics trolley transports the carrier with stacked double-sided graphic inner layer boards to the docking and positioning mechanism. The XY linear module drives the suction cup robot to pick up the double-sided graphic inner layer boards from the carrier and move them to the flat plate top mechanism or the double-sided graphic inner layer boards on the flat plate top mechanism. The PVC plastic plate of the flat plate top mechanism descends, causing the double-sided graphic inner layer boards to fall onto the roller conveying mechanism. The patting and positioning mechanism pats the double-sided graphic inner layer boards for positioning. Then, the roller conveying mechanism transports the double-sided graphic inner layer boards on it to the next board assembly machine or subsequent processing equipment. This twelve-layer board assembly device realizes the placement of five double-sided graphic inner layer boards in a specified order, meeting the automated production requirements of twelve-layer board assembly in the PCB lamination process. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a top view of the planar structure of the twelve-layer panel assembly device in this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the panel assembly machine in this utility model;

[0018] Figure 3 This is a side view of the panel assembly machine in this utility model.

[0019] Figure 4 This is a schematic diagram of the planar structure of the bottom surface of the vehicle in this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the docking and positioning mechanism in this utility model;

[0021] Figure 6 This is a three-dimensional structural diagram of the combination of the roller conveying mechanism, the flat plate top mechanism, and the clapper positioning mechanism in this utility model;

[0022] Figure 7 This is a front view plan view of the roller conveying mechanism in this utility model;

[0023] Figure 8 This is a three-dimensional structural diagram of the flat plate top mechanism in this utility model;

[0024] Figure 9 This is a three-dimensional structural diagram of the clapper positioning mechanism in this utility model;

[0025] Figure 10 This is a top view of the planar structure of the clapper positioning mechanism in this utility model;

[0026] Explanation of the labels in the diagram: Plate fitting machine 100, Frame 1, XY linear module 2, First linear module 21, Second linear module 22, Adapter frame 23, Suction cup robot 3, Third linear module 31, First aluminum profile 32, Second aluminum profile 33, Vacuum suction cup 34, Docking and positioning mechanism 4, Stand 41, Fork 42, First lead screw 43, First servo motor 44, Linear guide rail 45, Floating centering unit 46, Double-sided positioning cylinder 47, Rotary clamping cylinder 48, Movable clamping block 49, Fixed clamping block 410, Roller conveying mechanism 5, Longitudinal beam 51, Second servo motor 52, Conveying rod 53, Conveying roller 54, Synchronous belt drive 55. Sub-mounted plate top mechanism 6. First mounting plate 61. Lifting frame 62. Polyvinyl chloride plastic plate 63. Telescopic cylinder 64. Clearance hole 65. First guide rod 66. First guide sleeve 67. Clearance groove 68. Paddle positioning mechanism 7. Second mounting plate 71. Slide plate 72. Second guide rod 73. Second guide sleeve 74. Third servo motor 75. Drive pulley 76. Driven pulley 77. Transmission belt 78. L-shaped clamp 79. Belt clamp block 710. Support rod 711. Positioning rod 712. Carrier 200. Stainless steel base frame 2001. Stainless steel carrier plate 2002. Pin hole 2003. Crosshair cursor 2004. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 10 As shown, a 12-layer board fitting device for PCB lamination process includes five board fitting machines 100 and several carriers 200 for stacking double-sided patterned inner layer boards. The carriers 200 include a rectangular stainless steel base frame 2001 and a rectangular stainless steel carrier plate 2002. The stainless steel carrier plate 202 is welded to the top of the stainless steel base frame 201. The bottom of the stainless steel base frame 201 is provided with four pin holes 2003 with a diameter of 40mm. A crosshair cursor 2004 with a side length of 100mm is opened at the center of the bottom end of the stainless steel carrier plate 202. The crosshair cursor 2004 is used to facilitate the positioning of the logistics cart.

[0029] The panel assembly machine 100 includes a rectangular frame 1, with an XY linear module 2 mounted on the upper part of the frame 1. The moving end of the XY linear module 2 is equipped with a suction cup robot 3 for picking up double-sided patterned inner layer panels.

[0030] The XY linear module 2 includes a first linear module 21 in a horizontal state, a second linear module 22 in a vertical state, and a right-angled triangular adapter 23. The first linear module 21 is mounted on the frame 1, the second linear module 22 is mounted on the moving block of the first linear module 21, and the vertical side of the adapter 23 is mounted on the moving block of the second linear module 22. The first linear module 21 drives the second linear module 22, the adapter 23, and the suction cup robot 3 to move horizontally together; the second linear module 22 drives the adapter 23 and the suction cup robot 3 to move vertically together.

[0031] The suction cup robot 3 includes a third linear module 31. A first aluminum profile 32 is mounted on the tail of the outer shell of the third linear module, and a second aluminum profile 33 is mounted on the moving block of the third linear module. Multiple vacuum suction cups 34 are respectively mounted on the first aluminum profile 32 and the second aluminum profile 33. The third linear module drives the second aluminum profile 33 to move to adjust the distance between the second aluminum profile and the first aluminum profile; the vacuum suction cups draw a vacuum to pick up the double-sided patterned inner layer plate.

[0032] The middle of the frame 1 is equipped with a docking and positioning mechanism 4 for placing the carrier, a roller conveying mechanism 5 for conveying the double-sided graphic inner layer board, a flat plate lifting mechanism 6 for lifting the double-sided graphic inner layer board upwards, and a clapping plate positioning mechanism 7 for aligning the position of the double-sided graphic inner layer board. The flat plate of the flat plate lifting mechanism 6 is located above the conveying rod of the roller conveying mechanism 5, and the positioning rod of the clapping plate positioning mechanism 7 is located above the flat plate of the flat plate lifting mechanism 6. The roller conveying mechanisms 5 of the five panel fitting machines 100 are connected in series.

[0033] The docking and positioning mechanism 4 includes a rectangular upright 41 and a U-shaped fork 42. The upright 41 is mounted on the frame 1, and a first lead screw 43 is installed in the upright 41. A first servo motor 44 is installed at the bottom of the upright 41. The first servo motor 44 is connected to the lead screw 43 via a gear transmission pair. Specifically, a drive gear is installed on the motor shaft of the first servo motor 44, and a driven gear that meshes with the drive gear is installed on the lead screw 43. A set of linear guide rails 4 are installed on both sides of the front of the upright 41. 5. The rear end of the fork 42 is connected to the lead screw nut of the first lead screw 43 and the slider of the linear guide rail 45 by screws respectively; the top of the fork 42 is equipped with four floating centering units 46 arranged in a rectangular array, two pairs of bilateral positioning cylinders 47 arranged symmetrically on the left and right, and two rotary clamping cylinders 48 arranged symmetrically on the left and right. The rotary clamping cylinders 48 are close to the front end of the fork 42. The cylinder rod of the rotary clamping cylinder 48 is equipped with a movable clamping block 49. The rear end of the fork 42 is equipped with two symmetrically arranged fixed clamping blocks 410.

[0034] The first servo motor 44 drives the lead screw of the first lead screw to rotate, thereby adjusting the height of the forks 42 to facilitate the acceptance of the carrier transported by the logistics trolley, and gradually rises according to the decrease in the number of double-sided pattern inner plates on the carrier; the floating centering unit 46 centers the received carrier, and the double-sided positioning cylinder 47, the movable clamping block 49, and the fixed clamping block 410 cooperate to clamp the carrier placed on the forks to prevent the carrier from moving during the lifting and lowering of the forks.

[0035] The roller conveyor mechanism 5 includes two parallel longitudinal beams 51 and a second servo motor 52. The two longitudinal beams 51 are mounted on the frame 1, and multiple conveyor rods 53 perpendicular to the longitudinal beams 51 are installed between the two longitudinal beams 51. Each conveyor rod 53 is equipped with multiple equally spaced conveyor rollers 54. The second servo motor 52 is mounted at the bottom of one of the longitudinal beams 51. The motor shaft of the second servo motor 52 is connected to all the conveyor rods 53 in the roller conveyor mechanism 5 via a synchronous belt drive pair 55. The synchronous belt drive pair 55 includes a drive synchronous pulley mounted on the motor shaft of the second servo motor 52, a driven synchronous pulley mounted on each conveyor rod 53, and a synchronous belt. The synchronous belt meshes with both the drive synchronous pulley and all the driven synchronous pulleys in the roller conveyor mechanism 5. Multiple tensioning pulleys are also installed on the longitudinal beams 51 to tension the synchronous belt. The second servo motor drives the conveyor rods 53 to rotate, thereby rotating the conveyor rollers 54 and realizing the function of conveying the double-sided patterned inner layer plate.

[0036] The flat-plate top mechanism 6 includes two rectangular first mounting plates 61, a set of lifting frames 62, and a rectangular polyvinyl chloride (PVC) plastic plate 63. The two first mounting plates 61 are mounted on the frame 1. A telescopic cylinder 64 is installed at the bottom center of each first mounting plate 61. The piston rod of the telescopic cylinder 64 is connected to the lifting frame 62 through a floating joint. The PVC plastic plate 63 is installed at the top of the lifting frame 62. Several clearance holes 65 are opened on the PVC plastic plate 63, corresponding one-to-one with the positions of the conveying rollers 54. To ensure the stability of the lifting frame 62 during the lifting process, a first guide rod 66 is installed at the bottom of the lifting frame 62, and a first guide sleeve 67 is installed on the first mounting plate 61. The first guide rod 66 is fitted into the first guide sleeve 67. When the telescopic cylinder 64 extends, the PVC plastic plate 63 rises above the conveying rollers 54; when the telescopic cylinder 64 retracts, the PVC plastic plate 63 descends, allowing the top of the conveying rollers to pass through the clearance holes 65 and be exposed above the PVC plastic plate.

[0037] The positioning mechanism 7 includes two symmetrical second mounting plates 71 and two symmetrical sliding plates 72. The two second mounting plates 71 are mounted on the frame 1. Two second guide rods 73 perpendicular to the second mounting plates 71 are installed between the two second mounting plates 71. Each sliding plate 72 is equipped with two second guide sleeves 74 perpendicular to the sliding plate 72. The second guide sleeves 74 are fitted onto the second guide rods 73. A third servo motor 75 is mounted on the bottom of one of the second mounting plates 71. A drive pulley 76 is mounted on the motor shaft of the third servo motor 75. The other second mounting plate 71... A driven pulley 77 is installed at the bottom of the slide plate 72. A drive belt 78 is installed on both the drive pulley 76 and the driven pulley 77. An L-shaped clamping plate 79 is installed on one side of each slide plate 72. A belt clamping block 710 is installed on the bottom side of the L-shaped clamping plate 79. One end of the drive belt 78 is clamped between the belt clamping block 710 and the L-shaped clamping plate 79. Two sets of support rods 711 are installed on each slide plate 72. A horizontal positioning rod 712 is installed at the top of the support rods 711 located on the same slide plate 72. Circumvention grooves 68 are opened on both sides of the polyvinyl chloride plastic sheet 63 to allow the support rods to pass through. A third servo motor drives the drive belt 78 to rotate, thereby causing the two slide plates to move in opposite directions, thus striking the side of the double-sided pattern inner layer plate or the side away from the double-sided pattern inner layer plate, achieving the purpose of striking and positioning.

[0038] The logistics trolley transports a carrier with stacked double-sided graphic inner layer panels to the docking and positioning mechanism. The XY linear module drives the suction cup robot to pick up the double-sided graphic inner layer panels from the carrier and move them to the flat plate top mechanism or the double-sided graphic inner layer panels on the flat plate top mechanism. The PVC plastic plate of the flat plate top mechanism descends, causing the double-sided graphic inner layer panels to fall onto the roller conveyor mechanism. The patting and positioning mechanism pats the double-sided graphic inner layer panels to position them. Then, the roller conveyor mechanism transports the double-sided graphic inner layer panels on it to the next panel matching machine or subsequent processing equipment.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A PCB pressing process twelve-layer board arrangement device, characterized in that: The application relates to a double-sided pattern inner layer plate stacking device, which comprises five plate matching machines and a plurality of carriers for stacking double-sided pattern inner layer plates, wherein the plate matching machine comprises a cuboid-shaped machine frame, the upper portion of the machine frame is provided with an XY linear module, the moving end of the XY linear module is provided with a suction disc manipulator for sucking the double-sided pattern inner layer plates; the middle portion of the machine frame is provided with an interfacing positioning mechanism for placing the carrier, a roller conveying mechanism for conveying the double-sided pattern inner layer plates, a flat plate lifting mechanism for lifting the double-sided pattern inner layer plates upwards, a plate beating positioning mechanism for adjusting the position of the double-sided pattern inner layer plates, the flat plate of the flat plate lifting mechanism is located above the conveying rod of the roller conveying mechanism, the positioning rod of the plate beating positioning mechanism is located above the flat plate of the flat plate lifting mechanism, and the roller conveying mechanisms of the five plate matching machines are sequentially connected in series.

2. The twelve layer panelizing apparatus of claim 1, wherein: The carrier comprises a rectangular stainless steel bottom frame and a rectangular stainless steel carrier plate, the stainless steel carrier plate is welded at the top end of the stainless steel bottom frame, the bottom portion of the stainless steel bottom frame is provided with four pin hole with a diameter of 40 mm, and the bottom end center of the stainless steel carrier plate is provided with a cross cursor with a side length of 100 mm.

3. The twelve layer panelizing apparatus of claim 1, wherein: The XY linear module comprises a first linear module in a horizontal state, a second linear module in a vertical state and a right-angled triangular adapter, the first linear module is installed on the machine frame, the second linear module is installed on the moving block of the first linear module, and the vertical side of the adapter is installed on the moving block of the second linear module.

4. The twelve layer panel arrangement of claim 3, wherein: The suction disc manipulator comprises a third linear module, a first aluminum profile is installed at the tail of the shell of the third linear module, a second aluminum profile is installed on the moving block of the third linear module, and a plurality of vacuum suction discs are respectively installed on the first aluminum profile and the second aluminum profile.

5. The twelve layer board matching device of claim 1, wherein: The interfacing positioning mechanism comprises a rectangular stand and a U-shaped fork, the stand is installed on the machine frame, a first lead screw is installed in the stand, a first servo motor is installed at the bottom of the stand, the first lead screw is in transmission connection with the screw rod of the first servo motor through a gear transmission pair, a group of linear guides are respectively installed on the front sides of the stand, the rear end of the fork is connected with the screw nut of the first lead screw and the sliding block of the linear guide through screws, four floating centering units arranged in a rectangular array, two pairs of left-right symmetric double-sided positioning cylinders and two left-right symmetric rotary clamping cylinders are installed at the top end of the fork, the rotary clamping cylinders are close to the front end of the fork, movable clamping blocks are installed on the cylinder rods of the rotary clamping cylinders, and two symmetrically arranged fixed clamping blocks are installed at the rear end of the fork.

6. The twelve layer board matching device of claim 1, wherein: The roller conveying mechanism comprises two mutually parallel longitudinal beams and a second servo motor, the two longitudinal beams are installed on the machine frame, a plurality of conveying rods perpendicular to the longitudinal beams are installed between the two longitudinal beams, a plurality of conveying rollers with the same interval are installed on each conveying rod, the second servo motor is installed at the bottom of one of the longitudinal beams, and the motor shaft of the second servo motor is in transmission connection with all the conveying rods through a synchronous belt transmission pair.

7. The twelve layer panel arrangement of claim 6, wherein: The flat plate upper mechanism comprises two rectangular first installation plates, a set of lifting frames and a rectangular polyvinyl chloride plastic plate, the first installation plates are installed on a rack, a retractable air cylinder is installed at the bottom center of each first installation plate, and the piston rod of the retractable air cylinder is connected with the lifting frame through a floating joint; the polyvinyl chloride plastic plate is installed at the top end of the lifting frame, and a plurality of avoiding holes corresponding to the positions of the conveying rollers are formed in the polyvinyl chloride plastic plate.

8. The twelve layer panel arrangement of claim 7, wherein: The bottom end of the lifting frame is provided with a first guide rod, and the first installation plate is provided with a first guide sleeve, and the first guide rod is sleeved in the first guide sleeve.

9. The twelve layer panel arrangement of claim 7, wherein: The clapper positioning mechanism comprises two symmetrical second installation plates and two symmetrical sliding plates, the second installation plates are installed on a rack, two second guide rods perpendicular to the second installation plates are installed between the second installation plates, two second guide sleeves perpendicular to the sliding plates are installed on each sliding plate, the second guide sleeves are sleeved on the second guide rods, a third servo motor is installed at the bottom of one of the second installation plates, a driving belt pulley is installed on the motor shaft of the third servo motor, a driven belt pulley is installed at the bottom of the other second installation plate, and a transmission belt is installed on the driving belt pulley and the driven belt pulley, an L-shaped clamping plate is installed on one side of each sliding plate, a belt clamping block is installed at the bottom side of the L-shaped clamping plate, and a section of the transmission belt is clamped between the belt clamping block and the L-shaped clamping plate; two sets of supporting rods are installed on each sliding plate, and a horizontal positioning rod is installed at the top end of the supporting rods on the same sliding plate, and avoiding grooves are formed in the two sides of the polyvinyl chloride plastic plate for the supporting rods to pass through.

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