License plate erasing machine with high efficiency and low use cost

Abstract

The utility model discloses a license plate erasing machine with high efficiency and low use cost, which comprises a rack, a conveying platform is arranged in the middle of the rack, an erasing device is arranged above the conveying platform, and a mop device and a liquid storage tank are respectively arranged on the front side and the rear side of the erasing device; a cloth collecting device and a cloth releasing device are arranged on the front side and the rear side of the upper portion of the rack respectively, the cloth collecting device comprises a cloth collecting roller, a first rotating shaft with one end penetrating through the rack is arranged on the cloth collecting roller in the upward direction, an adjusting nut is arranged at the end of the first rotating shaft, a first friction disc is arranged on one side of the adjusting nut, and a spring is arranged between the adjusting nut and the first friction disc. The first friction disc is in key connection with the first rotating shaft, the first friction disc is in sliding connection with the first rotating shaft, a first chain wheel is arranged on one side of the first friction disc, a second friction disc attached to the first friction disc is arranged on the first chain wheel, and a cloth collecting motor is connected to the first chain wheel. The utility model has the advantages of low failure rate and low use cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to license plate eraser field, especially relates to a license plate eraser with high efficiency and low use cost. BACKGROUND

[0002] License plate eraser (abbreviation eraser) is the mechanical that license plate convex character's ink is wiped off, is used for replacing artificial wiping product, improves work efficiency, improves labor condition, is the ideal machine of current license plate production.

[0003] The existing license plate eraser, such as the license plate eraser of application No. 201921779880.1, including the rack, the middle part of the rack is equipped with the conveying platform, the conveying platform top is equipped with the eraser, the front and rear sides of the eraser are equipped with the mop device and the liquid storage tank respectively, the liquid storage tank is provided with the eraser liquid, and the both ends of the rack upper portion are respectively equipped with the cloth collecting device and the cloth placing device.

[0004] The working process of the existing license plate eraser is as follows: the license plate is transmitted to the lower portion of the eraser through the conveying platform, under the action of the mop device, the eraser cloth wound on the cloth placing device passes through the liquid storage tank, sticks the eraser liquid, then passes through the eraser, and finally is wound on the cloth collecting device, the moving direction of the eraser cloth and the license plate is opposite, and relative motion friction is carried out, so that the purpose of removing the ink on the convex character is achieved.

[0005] Since the winding diameter of the eraser cloth on the cloth collecting device and the cloth placing device changes, the tension of the non-woven fabric changes, and the tension effect is not ideal, so the constant tension device is arranged above the cloth collecting device and the cloth placing device.

[0006] The existing eraser has the following defects:

[0007] 1), the constant tension device can only alleviate the small amplitude tension fluctuation of the eraser cloth, when the license plate is deformed or the license plate and the eraser part are accidentally filled with sundries, the eraser cloth will be stuck, the tension on the eraser cloth will greatly increase, the constant tension device can only alleviate the increased tension in a short time, but as the cloth collecting device continues to wind the eraser cloth, the constant tension device does not work after the stroke is in place, the eraser cloth will be pulled off, the equipment will malfunction, and the production efficiency will be reduced, at the same time, the eraser cloth will be shortened, and it may need to be replaced, which increases the use cost.

[0008] 2), the structure of the constant tension device is complex, which increases the cost of the eraser.

[0009] 3), the eraser cloth passes through the liquid storage tank, and is soaked with a large amount of eraser liquid, and is squeezed dry through the water squeezing device in time, but the carrying amount still far exceeds the actual requirement, the consumption of the eraser liquid is large, and the use cost of the eraser is also increased. UTILITY MODEL CONTENTS

[0010] The utility model discloses a high -efficient low use cost's license plate erasing machine.

[0011] The utility model discloses a high -efficient low use cost's license plate erasing machine, including the frame, the middle part of frame is equipped with the conveying platform, the top of conveying platform is equipped with the erasing device, and the front and back sides of erasing device are equipped with mop device and liquid storage tank respectively, the front and back sides of frame upper portion are equipped with cloth collecting device and cloth releasing device respectively, cloth collecting device includes cloth collecting roller, and the one end of cloth collecting roller is equipped with the first rotating shaft that passes through the frame axially, and the end of first rotating shaft is equipped with the adjusting nut, and one side of adjusting nut is equipped with the first friction disc that passes through the first rotating shaft, and the spring is equipped between adjusting nut and first friction disc, and first friction disc is connected with the first rotating shaft key, and first friction disc and first rotating shaft are connected axially sliding, and one side of first friction disc is equipped with the first sprocket that passes through the first rotating shaft, and first sprocket is equipped with the second friction disc that is attached to first friction disc, and first sprocket is connected with the cloth collecting motor that is fixed with frame.

[0012] In the aforementioned high -efficient low use cost's license plate erasing machine, the mop device includes a mop roller located above the conveying platform, both ends of the mop roller are provided with support blocks fixed with the frame, one end of the mop roller is provided with a second sprocket and a third sprocket, a first chain is arranged between the second sprocket and the first sprocket, an output end of the cloth collecting motor is provided with a fourth sprocket, and a second chain is arranged between the fourth sprocket and the third sprocket.

[0013] In the aforementioned high -efficient low use cost's license plate erasing machine, one side of the mop roller is provided with a pressing roller, and the pressing roller is axially provided with a second rotating shaft.

[0014] In the aforementioned high -efficient low use cost's license plate erasing machine, the upper part of the liquid storage tank is provided with two guide rollers, an upper rubber roller is arranged between the two guide rollers, the upper rubber roller is rotatably connected with the liquid storage tank, and the side wall of the liquid storage tank facing the erasing device is outwardly curved to form a guide plate.

[0015] In the aforementioned high -efficient low use cost's license plate erasing machine, a plurality of grooves are arranged on the outer periphery of the upper rubber roller.

[0016] In the aforementioned high -efficient low use cost's license plate erasing machine, the guide rollers are slidably connected with the liquid storage tank, the moving direction of the guide rollers is vertical, and the two ends of the guide rollers are each provided with a compression spring.

[0017] In the aforementioned high -efficient low use cost's license plate erasing machine, the cloth releasing device includes a cloth releasing rod rotatably connected with the frame, and a brake mechanism is arranged on the cloth releasing side of the cloth releasing rod.

[0018] In the aforementioned high-efficiency low-cost license plate eraser, the brake mechanism comprises a gear fixed on the cloth releasing rod and a detection roller located at the cloth releasing side of the cloth releasing rod, a connecting rod is arranged between the detection roller and the gear, the connecting rod is rotationally connected with the frame, one end of the connecting rod is connected with the detection roller, and the other end of the connecting rod is provided with a top pin matched with a tooth groove on the gear.

[0019] In the aforementioned high-efficiency low-cost license plate eraser, the top pin is connected with the connecting rod through a leaf spring.

[0020] Compared with the prior art, the license plate eraser is improved on the basis of the license plate eraser with the application number 201921779880.1, and the main improvement points include the following:

[0021] 1) Cloth collecting device. In the improved cloth collecting device, the power transmission between the cloth collecting motor and the cloth collecting roller passes through two friction discs, and the maximum transmission torque exists between the two friction discs. The maximum transmission torque is determined by the pressure of the spring. By setting the appropriate maximum transmission torque, the traction force of the cloth eraser given by the cloth collecting motor is prevented from exceeding the required pulling force for breaking the cloth eraser. When the cloth eraser is stuck, the two friction discs will slip relative to each other, and the cloth eraser will not be torn. The equipment failure rate is reduced, the production efficiency is improved, and the cloth eraser will not be shortened, so that the cloth eraser does not need to be replaced, and the use cost is reduced.

[0022] 2) Cloth dragging device. In the improved cloth dragging device, the cloth pressing roller acts on the cloth eraser by relying on its own gravity. When the tension on the cloth eraser increases, the cloth pressing roller can be raised to adapt to the change of the tension on the cloth eraser. It is equivalent to the constant tension device on the existing license plate eraser, but the structure is simpler, thereby reducing the cost of the license plate eraser.

[0023] 3) Liquid storage tank. In the improved liquid storage tank, an upper glue roller is added. The friction force given to the upper glue roller by the cloth eraser during movement drives the upper glue roller to rotate, bringing the cloth eraser liquid in the liquid storage tank to the cloth eraser. The cloth eraser is single-sidedly glued, the amount of glue carried by the cloth eraser is reduced, the consumption of the cloth eraser liquid is reduced, and the use cost of the license plate eraser is reduced. The upper glue roller has a guide roller twice. The guide roller can increase the wrap angle of the cloth eraser on the upper glue roller, increase the friction force between the cloth eraser and the upper glue roller, ensure that the cloth eraser can drive the upper glue roller to rotate during movement, and ensure smooth gluing. At the same time, the guide roller is slidingly connected with the liquid storage tank, but when the tension on the cloth eraser increases, the guide roller can be raised to adapt to the change of the tension on the cloth eraser. It is equivalent to the constant tension device on the existing license plate eraser, but the structure is simpler, thereby reducing the cost of the license plate eraser.

[0024] 4), the cloth releasing device. In the improved cloth releasing device, the cloth releasing motor is cancelled, the cost of the wiping machine is reduced, and the brake mechanism is increased. The brake mechanism has simple structure and low cost. The brake mechanism can quickly stop the rotation of the cloth releasing stick after the cloth collecting motor stops working and the wiping cloth loses the traction force, so that the length of the wiping cloth released due to the inertia of the cloth releasing stick is short, the wiping cloth continuously released is avoided from being wound on other parts to cause equipment failure, and the production efficiency is improved.

[0025] 5), the cloth collecting device and the cloth dragging device share one motor, the number of motors is reduced, which also reduces the cost of the wiping machine. And using a single motor makes the wiping cloth only receive one traction force, the wiping cloth as a whole keeps synchronous movement, which can further reduce the failure rate of the equipment. Even if the motor fails, only the motor needs to be repaired. Compared with the existing wiping machine, the wiping cloth is driven by three motors, when any motor fails, it is difficult for the wiping cloth as a whole to keep synchronous movement, part of the wiping cloth may stop moving due to loss of power, and the other part of the wiping cloth may continue to move, and other equipment failures such as the wiping cloth being too tight to be pulled off or being too loose to be wound on other parts and knotted may occur.

[0026] In summary, the wiping machine has the advantages of low failure rate and low use cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a front view schematic diagram of the wiping machine.

[0028] Figure 2 is a right view sectional view of the cloth collecting device.

[0029] Figure 3 is a perspective view of the cloth dragging device in the rear view direction.

[0030] Figure 4 is a front view schematic diagram of the liquid storage tank.

[0031] Figure 5 is a schematic diagram of the connection between the guide roller and the liquid storage tank.

[0032] Figure 6 is a right view sectional view of the cloth releasing device.

[0033] Figure 7 is a rear view schematic diagram of the cloth releasing device.

[0034] Figure 8 is a perspective view of the wiping machine in the front view direction.

[0035] The markings in the accompanying drawings are: 1-frame, 2-conveyor platform, 3-erasing device, 4-mopping device, 5-liquid storage tank, 6-cloth collecting device, 7-cloth placing device; 401-mopping roller, 402-support block, 403-second sprocket, 404-third sprocket, 405-first chain, 406-fourth sprocket, 407-second chain, 408-second rotating shaft, 409-groove, 410-cloth pressing roller; 501-guide roller, 502-glue Roller, 503-guide plate, 504-groove, 505-compression spring, 506-slider, 507-chute; 601-cloth collecting roller, 602-first rotating shaft, 603-adjusting nut, 604-first friction disk, 605-first sprocket, 606-second friction disk, 607-cloth collecting motor, 608-spring; 701-cloth placing rod, 702-detection roller, 703-connecting rod, 704-top, 705-leaf spring, 706-gear. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0037] Embodiment. A high-efficiency and low-cost license plate eraser is improved on the basis of the license plate eraser of application number 201921779880.1, such as Figure 1 As shown, it includes a frame 1, a conveying platform 2 is provided in the middle of the frame 1, and the conveying platform 2 is a belt conveyor. A word-wiping device 3 connected to the frame 1 is provided above the conveying platform 2. A cloth-mopping device 4 and a liquid storage tank 5 are provided on the front and rear sides of the word-wiping device 3 respectively; a cloth-collecting device 6 and a cloth-releasing device 7 are provided on the front and rear sides of the upper part of the frame 1 respectively. In the initial state, the word-wiping cloth is on the cloth-releasing device 7, passes through the liquid storage tank 5, the word-wiping device 3, the cloth-mopping device 4 in sequence, and finally enters the cloth-collecting device 6. The word-wiping cloth between the cloth-releasing device 7 and the liquid storage tank is in an inclined state. The characteristics are as follows:

[0038] like Figure 2 As shown, the cloth collecting device 6 includes a cloth collecting roller 601, and the cloth collecting roller 601 is axially provided with a first rotating shaft 602 at one end passing through the frame 1, the first rotating shaft 602 is rotatably connected to the frame 1, and an adjusting nut 603 is provided at the end of the first rotating shaft 602, and a first friction disc 604 passed by the first rotating shaft 602 is provided on one side of the adjusting nut 603, and a spring 608 is provided between the adjusting nut 603 and the first friction disc 604, the first friction disc 604 is key-connected with the first rotating shaft 602, and the first friction disc 604 is axially slidably connected to the first rotating shaft 602, and a first sprocket 605 passed by the first rotating shaft 602 is provided on one side of the first friction disc 604, the first sprocket 605 is connected to the first rotating shaft 602 with a bearing, and a second friction disc 606 that fits with the first friction disc 604 is provided on the first sprocket 605, and a cloth collecting motor 607 fixed to the frame 1 is connected to the first sprocket 605.

[0039] The working principle of the cloth collecting device 6 is that the spring 608 presses the first friction disc 604 on the second friction disc 606, a friction connection is established between the two friction discs, the first sprocket 605 is driven to rotate by the cloth collecting motor 607, the first sprocket 605 drives the first friction disc 604 to rotate through the second friction disc 606, the first friction disc 604 drives the cloth collecting roller 601 to rotate through the first rotating shaft 602, and the cloth collecting roller 601 performs a cloth collecting action to wind the eraser cloth on the cloth collecting roller 601. When the eraser cloth is stuck, the resistance of the eraser cloth to the cloth collecting roller 601 jumps, the friction between the second friction disc 606 and the first friction disc 604 is insufficient to overcome the resistance of the cloth collecting roller 601, the cloth collecting roller 601 no longer rotates, and the tension of the eraser cloth no longer increases, avoiding the eraser cloth from being pulled off. By changing the axial position of the adjusting nut 603 on the first rotating shaft 602, the pre-tightening force of the spring 608 is changed, the maximum torque that can be transmitted between the two friction discs is changed, and thus the maximum traction of the cloth collecting device 6 to the eraser cloth is changed.

[0040] As shown in Figure 3 The cloth collecting device 4 includes a cloth collecting roller 401 located above the conveying platform 2, both ends of the cloth collecting roller 401 are provided with support blocks 402 fixed to the rack 1, the cloth collecting roller 401 is rotationally connected with the support blocks 402, one end of the cloth collecting roller 401 is provided with a second sprocket 403 and a third sprocket 404, a first chain 405 is arranged between the second sprocket 403 and the first sprocket 605, an output end of the cloth collecting motor 607 is provided with a fourth sprocket 406, and a second chain 407 is arranged between the fourth sprocket 406 and the third sprocket 404.

[0041] One side of the cloth collecting roller 401 is provided with a pressing roller 410, the pressing roller 410 is axially provided with a second rotating shaft 408, the pressing roller 410 is bearing-connected with the second rotating shaft 408, and the top surface of the support block 402 is provided with a groove 409 through which the second rotating shaft 408 passes. The eraser cloth passes around the bottom of the cloth collecting roller 401, and when the tension of the eraser cloth increases to a certain degree, the cloth collecting roller 401 can be raised to play a role of tension buffering.

[0042] The working principle of the cloth collecting device 4 is that the cloth collecting motor 607 drives the fourth sprocket 406 to rotate, the fourth sprocket 406 drives the cloth collecting roller 401 to rotate through the second chain 407, the cloth collecting roller 401 drives the second sprocket 403 to rotate, and the second sprocket 403 drives the first sprocket 605 to rotate through the first chain 405.

[0043] As shown in Figure 4 and Figure 5As shown, the liquid storage tank 5 is fixed to the frame 1, and the liquid storage tank 5 contains erasing liquid. Two guide rollers 501 are provided on the upper inner portion of the liquid storage tank 5. The guide rollers 501 are located above the liquid level of the erasing liquid. Sliders 506 fixed to the liquid storage tank 5 are provided at both ends of the guide rollers 501. Vertical chutes 507 are provided on the inner sides of the sliders 506. The ends of the guide rollers 501 extend into the chutes 507. A compression spring 505 is provided in the chutes 507. The compression spring 505 is located above the guide rollers 501. The ends of the guide rollers 501 are preferably configured as quadrangular prism-shaped square heads, the width of which matches the width of the chutes 507. A glue roller 502 is disposed between the two guide rollers 501. The bottom of the glue roller 502 is immersed in the erasing liquid. The glue roller 502 is preferably made of lightweight material and has a hollow structure to reduce weight and facilitate smooth rotation under low torque. Both ends of the glue roller 502 are connected to bearings in the liquid reservoir 5. The liquid reservoir 5 is curved outward toward the side wall of the erasing device 3 to form a guide plate 503. Multiple grooves 504 are provided on the outer circumference of the glue roller 502.

[0044] The liquid reservoir 5 operates as follows: the writing cloth passes under one guide roller 501, then over the top of the glue roller 502, then under the other guide roller 501, and finally over the guide plate 503. The tension of the moving writing cloth drives the glue roller 502 to rotate, which then applies a film of eraser liquid to the cloth. The groove 504 reduces the amount of glue applied by the glue roller 502 while increasing the friction between the glue roller 502 and the writing cloth, ensuring that the glue roller 502 rotates and applies glue, driven by the cloth.

[0045] like Figure 6 As shown, the cloth placing device 7 includes a cloth placing rod 701 rotatably connected to the frame 1 at one end, and a brake mechanism is provided on the cloth outlet side of the cloth placing rod 701. The brake mechanism includes a gear 706 fixed to the cloth placing rod 701 and a detection roller 702 located on the cloth outlet side of the cloth placing rod 701. The detection roller 702 is required to have a certain weight. An inclined connecting rod 703 is provided between the detection roller 702 and the gear 706. The connecting rod 703 is rotatably connected to the frame 1. One end of the connecting rod 703 is connected to one end of the detection roller 702, and the other end of the connecting rod 703 is provided with a tip 704 that cooperates with the tooth groove on the gear 706. The tip 704 is connected to the connecting rod 703 via a leaf spring 705. The tip 704 is located on the lower side of the gear.

[0046] The working principle of the cloth releasing device 7: under the action of its own gravity, the connecting rod 703 rotates, causing the detection roller 702 to rotate downward and fall on the inclined cleaning cloth between the cloth releasing device 7 and the liquid storage tank 5. In the working state of the cleaning machine, the cleaning cloth is taut, and the detection roller 702 is given an upward force by the cleaning cloth. The center pin 704 is separated from the gear 706, and the cloth releasing stick 701 can rotate freely, ensuring that the cleaning cloth on the cloth releasing stick 701 can be smoothly released. When the cleaning machine is stopped, the cleaning cloth loses traction, and the cloth releasing stick 701 continues to rotate under the action of inertia. The cleaning cloth on the cloth releasing stick 701 continues to be released, and the tension on the cleaning cloth disappears. The detection roller 702 descends, driving the connecting rod 703 to rotate, causing the center pin 704 to contact the gear 706, slowing down the gear, and thus causing the cloth releasing stick 701 to stop rotating at a faster speed, avoiding the cleaning cloth from being excessively released and winding around other parts, causing equipment failure. The purpose of setting the leaf spring 705 is to avoid the gear 706 from being suddenly stuck, causing excessive impact.

[0047] Method of use: as shown in Figure 1 the initial state of the roll-shaped cleaning cloth is wound on the cloth releasing stick 701. One end of the cleaning cloth is led out and passed from below the detection roller 702, from the bottom of one of the guide rollers 501, from the top of the gluing roller 502, from the bottom of the other guide roller 501, from the guide plate 503, bent through the cleaning device 3, from the mop roller 401, from the press roller 410, and then connected to the cloth collecting roller 601. When the cloth collecting motor 607 is started, the cleaning cloth moves from the cloth releasing stick 701 to the cloth collecting roller 601. Place the license plate on the feed end (front side of the rack 1) on the left side of the conveying platform 2. The license plate moves to the right, and the moving direction of the cleaning cloth and the license plate is opposite, making relative motion friction, and the cleaning cloth wipes off the ink on the raised characters of the license plate.

[0048] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting.

Claims

1. A high-efficiency, low-cost license plate eraser, comprising a frame (1), a conveying platform (2) provided in the middle of the frame (1), an eraser (3) provided above the conveying platform (2), a cloth-dragging device (4) and a liquid storage tank (5) provided on the front and rear sides of the eraser (3), respectively; a cloth-collecting device (6) and a cloth-releasing device (7) provided on the front and rear sides of the upper portion of the frame (1), respectively, and characterized in that: The cloth collecting device (6) comprises a cloth collecting roller (601), wherein the cloth collecting roller (601) is provided with a first rotating shaft (602) having one end passing through the frame (1) in the axial direction, an adjusting nut (603) is provided at the end of the first rotating shaft (602), a first friction disc (604) passed through by the first rotating shaft (602) is provided on one side of the adjusting nut (603), a spring (608) is provided between the adjusting nut (603) and the first friction disc (604), and the first friction disc ( 604) is key-connected to the first rotating shaft (602), the first friction disc (604) is axially slidably connected to the first rotating shaft (602), one side of the first friction disc (604) is provided with a first sprocket (605) passed by the first rotating shaft (602), the first sprocket (605) is provided with a second friction disc (606) in contact with the first friction disc (604), and the first sprocket (605) is connected to a cloth collecting motor (607) fixed to the frame (1).

2. The high-efficiency and low-cost license plate eraser according to claim 1 is characterized in that: The mopping device (4) comprises a mopping roller (401) located above the conveying platform (2), both ends of the mopping roller (401) are provided with support blocks (402) fixed to the frame (1), one end of the mopping roller (401) is provided with a second sprocket (403) and a third sprocket (404), a first chain (405) is provided between the second sprocket (403) and the first sprocket (605), a fourth sprocket (406) is provided at the output end of the cloth collecting motor (607), and a second chain (407) is provided between the fourth sprocket (406) and the third sprocket (404).

3. The high-efficiency and low-cost license plate eraser according to claim 2 is characterized in that: A cloth pressing roller (410) is provided on one side of the mopping roller (401), a second rotating shaft (408) is provided axially on the cloth pressing roller (410), and a groove (409) passed through by the second rotating shaft (408) is provided on the top surface of the support block (402).

4. The high-efficiency and low-cost license plate eraser according to claim 1 is characterized in that: Two guide rollers (501) are provided on the upper part of the liquid storage box (5), a glue roller (502) is provided between the two guide rollers (501), the glue roller (502) is rotatably connected to the liquid storage box (5), and the side wall of the liquid storage box (5) is bent outward toward the erasing device (3) to form a guide plate (503).

5. The high-efficiency and low-cost license plate eraser according to claim 4 is characterized in that: A plurality of grooves (504) are provided on the outer peripheral surface of the glue roller (502).

6. The high-efficiency and low-cost license plate eraser according to claim 4, characterized in that: The guide roller (501) is slidably connected to the liquid storage tank (5), the moving direction of the guide roller (501) is vertical, and compression springs (505) are provided at both ends of the guide roller (501).

7. The high-efficiency and low-cost license plate eraser according to claim 1, characterized in that: The cloth placing device (7) comprises a cloth placing rod (701) rotatably connected to the frame (1), and a brake mechanism is provided on the cloth outlet side of the cloth placing rod (701).

8. The high-efficiency and low-cost license plate eraser according to claim 7, characterized in that: The brake mechanism comprises a gear (706) fixed on the cloth placing roller (701) and a detection roller (702) located on the cloth outlet side of the cloth placing roller (701); a connecting rod (703) is provided between the detection roller (702) and the gear (706); the connecting rod (703) is rotatably connected to the frame (1); one end of the connecting rod (703) is connected to the detection roller (702); and the other end of the connecting rod (703) is provided with a top (704) that cooperates with a tooth groove on the gear (706).

9. The high-efficiency and low-cost license plate eraser according to claim 8, characterized in that: The top (704) is connected to the connecting rod (703) via a leaf spring (705).

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