Automatic overturning and transporting platform for printed circuit board

Abstract

The utility model relates to the technical field of circuit board processing, and discloses an automatic turnover transportation platform of a printed circuit board, which comprises fixed columns, fixed blocks I are mounted on the inner sides of the fixed columns, a sliding rail I is fixedly connected to the middle of the top wall of a bottom plate, a sliding block I is slidably connected to the outer side of the sliding rail I, and a fixed block II is mounted on the top wall of the bottom plate. A first rack is fixedly connected to the top wall of the first sliding block, a second fixing block is fixedly connected to the front end of the first rack, a first telescopic rod is fixedly connected to the left side of the second fixing block, a first air cylinder is installed at the tail end of the first telescopic rod, a second gear is connected to the top of the first rack in an engaged mode, and a first rotating shaft is fixedly connected to the right end of the second gear. According to the utility model, the cylinder I pushes and pulls the telescopic rod I, the telescopic rod I drives the rack I to slide back and forth on the slide rail I, the clamping plate I and the clamping plate II clamp the circuit board, the rack I slides back and forth to drive the gear I to rotate, and the gear I drives the circuit board to realize automatic rotation.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit board processing technical field especially relates to a printed circuit board's automatic turnover transport platform. BACKGROUND

[0002] PCB board, also known as printed wiring board, is the support body of important electronic components and electronic components and the carrier of electronic components electrical connection, is important electronic component, and the PCB board semi-finished product needs to be punched or slotted in processing, installs electronic component in the hole and wires in the slot, and the PCB board semi-finished product both sides generally need to install electronic component.

[0003] Through the retrieval, China patent publication number is: CN219536412U, discloses a printed circuit board's automatic flanging device, including with the circuit board that the conveying mechanism moves forward, the upper and lower two sides of conveying mechanism are oppositely provided with two clamping turntables, one clamping turntable can move towards another clamping turntable to cooperate clamping circuit board, still includes push mechanism, and the push part of push mechanism is push wheel, and push wheel corresponds to the board edge of push circuit board, so that the circuit board that is clamped rotates around clamping turntable and flanges, and the clamping turntable of conveying mechanism downside is driven displacement by lifting mechanism, and the clamping turntable downside moves up and separates circuit board from conveying mechanism, and the lifting mechanism is provided with auxiliary jack, and auxiliary jack and the clamping turntable downside of conveying mechanism synchronous displacement, and the top end of auxiliary jack is provided with universal ball, and the utility model can be used to in the circuit board edge grinding process to the circuit board automatic flanging, but angle sensor and control mechanism exist signal transmission delay, and it is difficult to achieve complete real-time control, and it needs to be calibrated and debugged every work time, and the present adoption high-precision, low-delay sensor and control element, such as novel optical fiber sensor, high-speed response PLC, adjusts control signal in advance, compensates delay, when the double side of PCB board semi-finished product needs to install electronic component, first installs the electronic component on one side of PCB board semi-finished product, and then the worker turns over the PCB board semi-finished product to the other side and places it on another processing table to continue installing electronic component, and the turnover process is time-consuming and laborious. UTILITY MODEL CONTENTS

[0004] In order to make up for the above shortcomings, the utility model provides a printed circuit board's automatic turnover transport platform, aims at improving the prior art that the worker turns over the PCB board semi-finished product to the other side and places it on another processing table to continue installing electronic component after installing the electronic component on one side of the PCB board semi-finished product, and the turnover process is time-consuming and laborious.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of automatic overturning transport platform of printed circuit board, including fixed column, the top of the fixed column is fixedly connected with crossbeam, the top wall right side of the crossbeam is equipped with signal lamp, the inboard of the fixed column is equipped with fixed block one, the top wall of the fixed block one is fixedly connected with bottom plate, the top wall middle part of the bottom plate is fixedly connected with slide rail one, the outside of slide rail one is slidably connected with sliding block one, the top wall of the sliding block one is fixedly connected with rack one, the front end of the rack one is fixedly connected with fixed block two, the left side of the fixed block two is fixedly connected with telescopic link one, the end of telescopic link one is equipped with cylinder one, the top of the rack one is engagedly connected with gear two, the right end of the gear two is fixedly connected with rotating shaft one, the outer wall middle part of the rotating shaft one is rotatably connected with rotating shaft seat, the right end of the rotating shaft one is fixedly connected with mounting block, the inboard of the mounting block is slidably connected with multiple racks two at equal intervals, the top end of the rack two is fixedly connected with clamping plate one, the bottom end of the mounting block is fixedly connected with clamping plate two, the rear side of the fixed column is provided with processing bin, the inner wall both sides of the processing bin are equipped with safety light curtain, the top wall of the crossbeam is equipped with electric wire, the front and rear sides of the fixed column are equipped with baffle, the outside of the baffle is equipped with observation window, the inboard bottom of the processing bin is provided with fixed mechanism, and fixed mechanism is used to adjust and fix the position of circuit board.

[0006] Through the above technical scheme: cylinder one pushes and pulls telescopic link one, and telescopic link one drives rack one to slide back and forth on slide rail one, the top of the rack one is engagedly connected with gear one, the right end of the gear one is equipped with clamping plate one and clamping plate two, clamping plate one and clamping plate two clamp circuit board, and rack one drives gear one to rotate by sliding back and forth, and circuit board has been fixed by clamping plate one and clamping plate two, so that gear one drives circuit board to realize automatic rotation.

[0007] As further description of the above technical scheme:

[0008] The fixed mechanism includes base, the base is arranged at the inboard bottom of the processing bin, the top of the base is fixedly connected with square plate, the top wall middle part of the square plate is fixedly connected with rotating shaft two, the outer wall of the rotating shaft two is rotatably connected with connecting block, the top wall of the connecting block is fixedly connected with bolt on front and back sides, the outer wall of two bolts is rotatably connected with connecting plate, the outer wall of two connecting plates is rotatably connected with bolt, the top wall of the square plate is fixedly connected with slide rail two on front and back sides, the outer wall of two slide rail two is slidably connected with sliding block two, the top of the sliding block two is fixedly connected with long plate, the top wall of the long plate is fixedly connected with multiple support columns at equal intervals, the bolt is rotatably connected in the top wall middle part of long plate, the front and back of right side long plate are equipped with telescopic link two, and the end of telescopic link two is equipped with cylinder two.

[0009] Through the technical scheme, the circuit board is conveyed to the corresponding position by the conveying roller, the second telescopic rod of the second cylinder is pulled, the second sliding block under the long plate slides outward on the second sliding rail, the bolt under the second sliding block pulls the connecting plate, the connecting plate rotates on the second rotating shaft of the connecting block, the connecting plate rotates on the second rotating shaft, the connecting block rotates to pull the right connecting plate, the long plate and the supporting column move outward at the same time, and different models of circuit boards can be fixed and processed by moving the long plate at the same time.

[0010] Further description of the technical scheme is as follows:

[0011] The right upper part of the fixed column is provided with a mechanical arm, and the end of the mechanical arm is provided with a controller.

[0012] Through the technical scheme, the controller is responsible for coordinating and controlling the operation of each component, and common controllers include programmable logic controllers and single-chip microcomputers.

[0013] Further description of the technical scheme is as follows:

[0014] The outer wall of the cross beam is fixedly connected with a limiting plate on the front side, and the inner side of the limiting plate is provided with a monitor.

[0015] Through the technical scheme, the position of the printed circuit board on the transportation track and the turning angle of the turning mechanism are detected.

[0016] Further description of the technical scheme is as follows:

[0017] The top of the limiting plate is fixedly connected with a plurality of fixed rods, and the top end of the fixed rod is fixedly connected with a fixed plate.

[0018] Through the technical scheme, the strength is high, the hardness is large, the corrosion resistance and wear resistance are excellent, the performance can be maintained stable in harsh environment, and the structural stability of the monitor is ensured.

[0019] Further description of the technical scheme is as follows:

[0020] The inner side of the fixed column is provided with a conveying table, and the inner side of the conveying table is equidistantly rotatably connected with a plurality of conveying rollers.

[0021] Through the technical scheme, the conveying table is used for bearing and guiding the transportation of the printed circuit board, and is usually made of aluminum alloy and stainless steel, which has high strength and wear resistance.

[0022] Further description of the technical scheme is as follows:

[0023] The right side of the rack two is engaged with a gear one, and the front and rear ends of the gear one are provided with clamping blocks.

[0024] Through the technical scheme, the motor rotates the gear one to rotate, and the gear one rotates the rack two to slide up and down.

[0025] Further description of the technical scheme is as follows:

[0026] The front end of the gear one is provided with the motor, and the left side of the motor is fixedly connected with the limiting block.

[0027] Through the technical scheme, the motor rotates the gear one to rotate, and the gear one rotates the rack two to slide up and down.

[0028] The utility model has the advantages of the following:

[0029] 1、 the utility model discloses, cylinder one push-pull telescopic link one, telescopic link one drives rack one to slide back and forth on slide rail one, and the top of rack one is connected with gear one in meshing, and the right end of gear one is installed with clamping plate one and clamping plate two, and clamping plate one and clamping plate two clamp circuit board, and rack one slides back and forth to drive gear one to rotate, and circuit board has been fixed by clamping plate one and clamping plate two, and gear one drives circuit board to realize automatic rotation.

[0030] 2、 the utility model discloses, circuit board is conveyed to the corresponding position through the conveyance roll, and cylinder two push-pull telescopic link two, and make the slide block two under the long plate slide outwards on slide rail two, and the bolt under slide block two stretches the connecting plate, and the connecting plate rotates on the pivot two of connecting block, and makes the connecting plate rotate on pivot two, and the connecting block rotates and drives the connecting plate of right side to stretch simultaneously, and makes the long plate and support column move outwards simultaneously, and the long plate can be fixed and processed simultaneously through the simultaneous movement of long plate and adapt to different models of circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A perspective view of the automatic overturning and transporting platform for printed circuit boards is provided for the utility model;

[0032] Figure 2 A front view of the automatic overturning and transporting platform for printed circuit boards is provided for the utility model;

[0033] Figure 3 A side view of the automatic overturning and transporting platform for printed circuit boards is provided for the utility model;

[0034] Figure 4 A partial structure schematic view of the automatic overturning and transporting platform for printed circuit boards is provided for the utility model;

[0035] Figure 5 A partial structure exploded view of the automatic overturning and transporting platform for printed circuit boards is provided for the utility model;

[0036] Figure 6The utility model provides a kind of automatic overturning transport platform's fixed mechanism schematic view of printed circuit board.

[0037] Legend:

[0038] 1, fixed column;2, fixed mechanism;201, base;202, square plate;203, cylinder two;204, telescopic rod two;205, long plate;206, slider two;207, support column;208, bolt;209, slide rail two;210, connecting block;211, connecting plate;212, pivot two;3, crossbeam;4, conveying table;5, conveying roller;6, baffle;7, observation window;8, mechanical arm;9, controller;10, signal lamp;11, electric wire;12, fixed plate;13, fixed rod;14, limit plate;15, monitor;16, processing bin;17, safety light curtain;18, fixed block one;19, cylinder one;20, telescopic rod one;21, fixed block two;22, rack one;23, pivot seat;24, pivot one;25, mounting block;26, clamping plate one;27, gear one;28, clamping plate two;29, motor;30, limit block;31, bottom plate;32, slider one;33, slide rail one;34, gear two;35, clamping block;36, rack two. Specific embodiments

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0040] Reference Figure 1 , Figure 4 and Figure 5The utility model provides an embodiment: a kind of automatic overturning transport platform of printed circuit board, fixed column 1 is provided, the top of fixed column 1 is fixedly connected with crossbeam 3, the top wall right side of crossbeam 3 is equipped with signal lamp 10, the inboard of fixed column 1 is equipped with fixed block one 18, the top wall of fixed block one 18 is fixedly connected with bottom plate 31, the top wall middle part of bottom plate 31 is fixedly connected with slide rail one 33, the outside of slide rail one 33 is slidably connected with sliding block one 32, the top wall of sliding block one 32 is fixedly connected with rack one 22, the front end of rack one 22 is fixedly connected with fixed block two 21, the left side of fixed block two 21 is fixedly connected with telescopic link one 20, the end of telescopic link one 20 is equipped with cylinder one 19, the top of rack one 22 is engagedly connected with gear two 34, the right end of gear two 34 is fixedly connected with shaft one 24, the outer wall middle part of shaft one 24 is rotatably connected with shaft seat 23, the right end of shaft one 24 is fixedly connected with mounting block 25, the inboard of mounting block 25 equidistantly slidably connected with multiple rack two 36, the top end of rack two 36 is fixedly connected with clamping plate one 26, the bottom end of mounting block 25 is fixedly connected with clamping plate two 28, cylinder one 19 pushes and pulls telescopic link one 20, and telescopic link one 20 drives rack one 22 to slide back and forth on slide rail one 33, and the top of rack one 22 is engagedly connected with gear one 27;Gear one 27 is equipped with clamping plate one 26 and clamping plate two 28 on the right end, and clamping plate one 26 and clamping plate two 28 clamp circuit board;Rack one 22 drives gear one 27 to rotate by sliding back and forth, and circuit board has been fixed by clamping plate one 26 and clamping plate two 28, so that gear one 27 drives circuit board to realize automatic rotation, the rear side of fixed column 1 is provided with processing bin 16, the inner wall both sides of processing bin 16 are equipped with safety light curtain 17, the top wall of crossbeam 3 is equipped with electric wire 11, the front and rear sides of fixed column 1 are equipped with baffle 6, and the outside of baffle 6 is equipped with observation window 7, and the inboard bottom of processing bin 16 is provided with fixed mechanism 2, and fixed mechanism 2 is used to adjust and fix the position of circuit board, the right side middle part of fixed column 1 is equipped with mechanical arm 8, the end of mechanical arm 8 is equipped with controller 9, and controller 9 is responsible for coordinating and controlling the operation of each component, and the outer wall front side of crossbeam 3 is fixedly connected with limit plate 14, and the inboard of limit plate 14 is equipped with monitor 15, and monitor 15 is used to detect the position of printed circuit board on transport track and the overturning angle of overturning mechanism.

[0041] Specifically, cylinder one 19 pushes and pulls telescopic link one 20, and telescopic link one 20 drives rack one 22 to slide back and forth on slide rail one 33, and the top of rack one 22 is engagedly connected with gear one 27;Gear one 27 is equipped with clamping plate one 26 and clamping plate two 28 on the right end, and clamping plate one 26 and clamping plate two 28 clamp circuit board;Rack one 22 drives gear one 27 to rotate by sliding back and forth, and circuit board has been fixed by clamping plate one 26 and clamping plate two 28, so that gear one 27 drives circuit board to realize automatic rotation.

[0042] Refer to Figure 1 , Figure 3And Figure 6 The fixing mechanism 2 comprises a base 201 arranged at the inner bottom of the processing bin 16, the top of the base 201 is fixedly connected with a square plate 202, the middle of the top wall of the square plate 202 is fixedly connected with a rotating shaft two 212, the outer wall of the rotating shaft two 212 is rotatably connected with a connecting block 210, the top wall of the connecting block 210 is fixedly connected with a bolt 208 on the front and back sides, the outer wall of the two bolts 208 is rotatably connected with a connecting plate 211, the outer wall of the two connecting plates 211 is rotatably connected with a bolt 208, the top wall of the square plate 202 is fixedly connected with a slide rail two 209 on the front and back sides, the outer wall of the two slide rail two 209 is slidably connected with a slide block two 206, the top of the slide block two 206 is fixedly connected with a long plate 205, the top wall of the long plate 205 is equidistantly fixedly connected with a plurality of support columns 207, the bolt 208 is rotatably connected in the middle of the top wall of the long plate 205, the front and back of the right long plate 205 is mounted with a telescopic rod two 204, the telescopic rod two 204 is mounted with a cylinder two 203, the circuit board is conveyed to the corresponding position of the processing bin 16 through the conveying roller 5, the cylinder two 203 pushes and pulls the telescopic rod two 204, so that the slide block two 206 under the long plate 205 slides outward on the slide rail two 209; the bolt 208 under the slide block two 206 stretches the connecting plate 211, the connecting plate 211 rotates on the rotating shaft two 212 of the connecting block 210; the connecting plate 211 rotates on the rotating shaft two 212, the connecting block 210 rotates to drive the right connecting plate 211 to stretch at the same time, so that the long plate 205 and the support column 207 move outward at the same time, the simultaneous movement of the long plate 205 can adapt to different models of circuit boards for fixing and processing, a plurality of fixing rods 13 are fixedly connected to the top of the limiting plate 14, the top end of the fixing rod 13 is fixedly connected with a fixed plate 12, the fixed plate 12 has high strength, large hardness, excellent corrosion resistance and wear resistance, can maintain stable performance in harsh environment, and ensures the structural stability of the monitor 15, the inner side of the fixing column 1 is mounted with a conveying table 4, a plurality of conveying rollers 5 are equidistantly rotatably connected to the inner side of the conveying table 4, the conveying roller 5 is used for bearing and guiding the transportation of the printed circuit board, and is usually made of aluminum alloy and stainless steel material, and has high strength and wear resistance.

[0043] Specifically, the circuit board is conveyed to the corresponding position of the processing bin 16 through the conveying roller 5, the cylinder two 203 pushes and pulls the telescopic rod two 204, so that the slide block two 206 under the long plate 205 slides outward on the slide rail two 209; the bolt 208 under the slide block two 206 stretches the connecting plate 211, the connecting plate 211 rotates on the rotating shaft two 212 of the connecting block 210; the connecting plate 211 rotates on the rotating shaft two 212, the connecting block 210 rotates to drive the right connecting plate 211 to stretch at the same time, so that the long plate 205 and the support column 207 move outward at the same time, the simultaneous movement of the long plate 205 can adapt to different models of circuit boards for fixing and processing.

[0044] Refer to Figure 2、 Figure 4 and Figure 5 The right side of the rack two 36 is engaged with the gear one 27, the front and rear ends of the gear one 27 are installed with the clamping block 35, the front end of the gear one 27 is installed with the motor 29, the motor 29 rotates to drive the rack two 36 to slide up and down, and cooperates with the clamping plate two 28 to fix the circuit board.

[0045] Specifically, the right side of the rack two 36 is engaged with the gear one 27, the front and rear ends of the gear one 27 are installed with the clamping block 35, the front end of the gear one 27 is installed with the motor 29, the motor 29 rotates to drive the rack two 36 to slide up and down, and cooperates with the clamping plate two 28 to fix the circuit board.

[0046] Working principle: the cylinder one 19 pushes and pulls the telescopic rod one 20, the telescopic rod one 20 drives the rack one 22 to slide back and forth on the slide rail one 33, the top of the rack one 22 is engaged with the gear one 27; the right end of the gear one 27 is installed with the clamping plate one 26 and the clamping plate two 28, the clamping plate one 26 and the clamping plate two 28 clamp the circuit board; the rack one 22 slides back and forth to drive the gear one 27 to rotate, the circuit board is fixed by the clamping plate one 26 and the clamping plate two 28, and the gear one 27 drives the circuit board to rotate automatically.

[0047] The circuit board is conveyed to the corresponding position of the processing bin 16 through the conveying roller 5, the cylinder two 203 pushes and pulls the telescopic rod two 204, the sliding block two 206 under the long plate 205 slides outward on the slide rail two 209; the bolt 208 under the sliding block two 206 stretches the connecting plate 211, the connecting plate 211 rotates on the rotating shaft two 212 of the connecting block 210; the connecting plate 211 rotates on the rotating shaft two 212, and the rotation of the connecting block 210 drives the right connecting plate 211 to stretch at the same time, so that the long plate 205 and the supporting column 207 move outward at the same time, and the simultaneous movement of the long plate 205 can adapt to different models of circuit boards for fixing and processing.

[0048] Finally, it should be pointed out that: the above only for preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. An automatic overturning transport platform of printed circuit board, comprising a fixed column (1), characterized in that: The top end of the fixed column (1) is fixedly connected with a cross beam (3), a signal lamp (10) is installed on the top wall right side of the cross beam (3), the inner side of the fixed column (1) is provided with a fixed block one (18), the top wall of the fixed block one (18) is fixedly connected with a bottom plate (31), the top wall middle part of the bottom plate (31) is fixedly connected with a slide rail one (33), the outer side of the slide rail one (33) is slidably connected with a sliding block one (32), the top wall of the sliding block one (32) is fixedly connected with a rack one (22), the front end of the rack one (22) is fixedly connected with a fixed block two (21), the left side of the fixed block two (21) is fixedly connected with a telescopic rod one (20), the end of the telescopic rod one (20) is installed with a cylinder one (19), the top of the rack one (22) is meshingly connected with a gear two (34), the right end of the gear two (34) is fixedly connected with a rotating shaft one (24), the outer wall middle part of the rotating shaft one (24) is rotatably connected with a rotating shaft seat (23), the right end of the rotating shaft one (24) is fixedly connected with a mounting block (25), the inner side of the mounting block (25) is equidistantly slidably connected with a plurality of racks two (36), the top end of the rack two (36) is fixedly connected with a clamping plate one (26), the bottom end of the mounting block (25) is fixedly connected with a clamping plate two (28), the rear side of the fixed column (1) is provided with a processing bin (16), the inner wall both sides of the processing bin (16) are installed with safety light curtains (17), the top wall of the cross beam (3) is installed with an electric wire (11), the front and rear sides of the fixed column (1) are installed with baffles (6), the outer side of the baffle (6) is provided with an observation window (7), the inner side bottom of the processing bin (16) is provided with a fixing mechanism (2), and the fixing mechanism (2) is used to adjust and fix the position of the circuit board.

2. An automatic flip transport platform for printed circuit boards as claimed in claim 1, characterized in that: The fixing mechanism (2) comprises a base (201), the base (201) is arranged on the inner side bottom of the processing bin (16), the top of the base (201) is fixedly connected with a square plate (202), the top wall middle part of the square plate (202) is fixedly connected with a rotating shaft two (212), the outer wall of the rotating shaft two (212) is rotatably connected with a connecting block (210), the top wall of the connecting block (210) is fixedly connected with a bolt (208) on the front and rear sides, the outer wall of the two bolts (208) is rotatably connected with a connecting plate (211), the outer wall of the two connecting plates (211) is rotatably connected with a bolt (208), the top wall of the square plate (202) is fixedly connected with a slide rail two (209) on the front and rear sides, the outer wall of the two slide rail two (209) is slidably connected with a sliding block two (206), the top of the sliding block two (206) is fixedly connected with a long plate (205), the top wall of the long plate (205) is equidistantly fixedly connected with a plurality of support columns (207), the bolt (208) is rotatably connected on the top wall middle part of the long plate (205), the front and rear of the right side of the long plate (205) are installed with telescopic rods two (204), the end of the telescopic rod two (204) is installed with a cylinder two (203).

3. An automatic flip transport platform for printed circuit boards as defined in claim 1, characterized in that: The right middle upper part of the fixed column (1) is installed with a mechanical arm (8), and the tail end of the mechanical arm (8) is installed with a controller (9).

4. The automatic flip turn transport platform for printed circuit boards of claim 1 wherein: The outer wall front side of the cross beam (3) is fixedly connected with a limiting plate (14), and the inner side of the limiting plate (14) is installed with a monitor (15).

5. An automatic flip turn transport platform for printed circuit boards as defined in claim 4, characterized in that: The top of the limiting plate (14) is fixedly connected with a plurality of fixed rods (13), and the top end of the fixed rod (13) is fixedly connected with a fixed plate (12).

6. An automatic flip turn transport platform for printed circuit boards as defined in claim 1, characterized in that: The inner side of the fixed column (1) is installed with a conveying table (4), and the inner side of the conveying table (4) is equidistantly rotatably connected with a plurality of conveying rollers (5).

7. An automatic flip turn transport platform for printed circuit boards as defined in claim 1, characterized in that: The right side of the rack two (36) is engagedly connected with a gear one (27), and the front and rear ends of the gear one (27) are both installed with a clamping block (35).

8. An automatic flip transport platform for printed circuit boards according to claim 7, characterized in that: The front end of the gear one (27) is installed with a motor (29), and the left side of the motor (29) is fixedly connected with a limiting block (30).

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