License plate erasing machine with high efficiency and low use cost and use method

Abstract

The invention discloses an efficient and low-use-cost license plate erasing machine and a use method. The efficient and low-use-cost license plate erasing machine 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 cloth dragging device and a liquid storage tank are arranged on the front side and the rear side of the erasing device correspondingly; 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 a roller shaft of the cloth collecting roller, 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 invention has the advantages of low failure rate and low use cost.

Description

Technical Field

[0001] The invention belongs to the field of license plate erasing machines, and in particular relates to a high-efficiency and low-cost license plate erasing machine and a use method thereof. Background Art

[0002] The license plate eraser (eraser for short) is a machine that wipes off the ink on the embossed characters on the license plate. It is used to replace manual wiping products, improve work efficiency, and improve working conditions. It is currently an ideal machine for license plate production.

[0003] An existing license plate eraser, such as the license plate eraser with application number 201921779880.1, comprises a frame, a conveying platform is provided in the middle of the frame, an erasing device is provided above the conveying platform, a mopping device and a liquid storage tank are provided on the front and rear sides of the erasing device, erasing liquid is provided in the liquid storage tank, and a cloth collecting device and a cloth placing device are provided at both ends of the upper part of the frame.

[0004] The working process of the existing license plate erasing machine is as follows: the license plate is transmitted to the bottom of the erasing device through the conveying platform. Under the action of the cloth mopping device, the erasing cloth wound on the cloth placing device passes through the liquid storage tank, passes through the erasing device after being sticky with the erasing liquid, and is finally wound to the cloth collecting device. The moving directions of the erasing cloth and the license plate are opposite, and they perform relative motion and friction, thereby achieving the purpose of removing ink on the embossed characters.

[0005] Since the winding diameter of the word-erasing cloth on the cloth collecting device and the cloth placing device may vary, this may cause the tensioning force of the non-woven fabric to vary, resulting in an unsatisfactory tensioning effect. Therefore, a constant tension device is provided above the cloth collecting device and the cloth placing device.

[0006] Existing word erasing machine has the following defects:

[0007] 1) The constant tension device can only alleviate the slight tension fluctuation of the erasing cloth. When the license plate is deformed or debris accidentally enters between the license plate and the erasing part, the erasing cloth will be stuck and the tension on the erasing cloth will increase greatly. The constant tension device can only alleviate the increased tension in a short time. However, as the cloth-collecting device continues to rewind the erasing cloth, the constant tension device will not work after the stroke of the constant tension device is in place. The erasing cloth will be broken, the equipment will fail and need to be repaired, which reduces production efficiency. At the same time, the erasing cloth becomes shorter and may need to be replaced, which increases the cost of use.

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

[0009] 3) The erasing cloth passes through the liquid storage tank, soaked with a large amount of erasing liquid, and squeezed out in time by the squeezing device, but the amount carried is still far beyond the actual need, the consumption of erasing liquid is large, and the cost of using the eraser is also increased. Summary of the invention

[0010] The object of the present invention is to provide a high-efficiency and low-cost license plate eraser and a method for using the same. The present invention has the advantages of low failure rate and low cost.

[0011] The technical solution of the present invention is a high-efficiency and low-cost license plate erasing machine, comprising a frame, a conveying platform is provided in the middle of the frame, an erasing device is provided above the conveying platform, a mopping device and a liquid storage tank are respectively provided on the front and rear sides of the erasing device; a cloth collecting device and a cloth releasing device are respectively provided on the front and rear sides of the upper part of the frame, and the cloth collecting device comprises a cloth collecting roller, a first rotating shaft with one end passing through the frame is provided on the cloth collecting roller shaft, an adjusting nut is provided on the end of the first rotating shaft, a first friction disk passed by the first rotating shaft is provided on one side of the adjusting nut, a spring is provided between the adjusting nut and the first friction disk, the first friction disk is key-connected with the first rotating shaft, the first friction disk is slidably connected with the first rotating shaft in the axial direction, a first sprocket passed by the first rotating shaft is provided on one side of the first friction disk, a second friction disk fitted with the first friction disk is provided on the first sprocket, and a cloth collecting motor fixed to the frame is connected to the first sprocket.

[0012] In the aforementioned high-efficiency and low-cost license plate eraser, the mopping device includes a mopping roller located above the conveying platform, both ends of the mopping roller are provided with support blocks fixed to the frame, one end of the mopping roller is provided with a second sprocket and a third sprocket, a first chain is provided between the second sprocket and the first sprocket, a fourth sprocket is provided at the output end of the cloth collecting motor, and a second chain is provided between the fourth sprocket and the third sprocket.

[0013] In the aforementioned high-efficiency and low-cost license plate eraser, a cloth pressing roller is provided on one side of the mopping roller, a second rotating shaft is provided axially of the cloth pressing roller, and a groove passed through by the second rotating shaft is provided on the top surface of the support block.

[0014] In the aforementioned high-efficiency, low-cost license plate eraser, two guide rollers are provided on the upper part of the liquid storage tank, a glue roller is provided between the two guide rollers, the glue roller is rotatably connected to the liquid storage tank, and the liquid storage tank is bent outward toward the side wall of the erasing device to form a guide plate.

[0015] In the aforementioned high-efficiency and low-cost license plate eraser, a plurality of grooves are arranged on the outer peripheral surface of the glue roller.

[0016] In the aforementioned high-efficiency and low-cost license plate eraser, the guide roller is slidably connected to the liquid storage tank, the moving direction of the guide roller is vertical, and compression springs are provided at both ends of the guide roller.

[0017] In the aforementioned high-efficiency and low-cost license plate eraser, the cloth placing device comprises a cloth placing rod rotatably connected to the frame, and a brake mechanism is provided on the cloth outlet side of the cloth placing rod.

[0018] In the aforementioned high-efficiency, low-cost license plate eraser, the brake mechanism includes a gear fixed on the cloth release roller and a detection roller located on the cloth outlet side of the cloth release roller, a connecting rod is provided between the detection roller and the gear, the connecting rod is rotatably connected to the frame, one end of the connecting rod is connected to the detection roller, and the other end of the connecting rod is provided with a top that cooperates with the tooth groove on the gear.

[0019] In the aforementioned high-efficiency and low-cost license plate eraser, the top tip is connected to the connecting rod via a leaf spring.

[0020] The method for using the aforementioned high-efficiency and low-cost license plate eraser is to change the maximum traction force of the cloth collecting device on the eraser cloth by changing the axial position of the adjusting nut on the first rotating shaft.

[0021] Compared with the prior art, the present invention is improved on the basis of the license plate eraser of application number 201921779880.1, and the main improvements include the following:

[0022] 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. There is a maximum transmission torque between the two friction discs, which is determined by the pressure of the spring. By setting a suitable maximum transmission torque, it is prevented that the traction force given to the word-wiping cloth by the cloth collecting motor exceeds the pulling force required for the word-wiping cloth to break. When the word-wiping cloth is stuck, the two friction discs slip against each other, and the word-wiping cloth will not be torn off. The equipment failure rate is reduced, and the production efficiency is improved. At the same time, the word-wiping cloth will not become shorter and does not need to be replaced, which reduces the cost of use.

[0023] 2) Cloth mopping device. In the improved cloth mopping device, the cloth pressing roller acts on the erasing cloth by its own gravity. When the tension on the erasing cloth increases, the cloth pressing roller can rise to adapt to the tension change of the erasing cloth. It is equivalent to the constant tension device on the existing erasing machine, but the structure is simpler, thereby reducing the cost of the erasing machine.

[0024] 3) Liquid storage tank. In the improved liquid storage tank, a glue roller is added. The friction force given to the glue roller by the moving word-wiping cloth is used to drive the glue roller to rotate, and the word-wiping liquid in the liquid storage tank is brought to the word-wiping cloth. The word-wiping cloth is glued on one side, which reduces the amount of glue on the word-wiping cloth, reduces the consumption of the word-wiping liquid, and reduces the cost of using the word-wiping machine. The glue roller has guide rollers twice. The guide rollers can increase the wrap angle of the word-wiping cloth on the glue roller, increase the friction between the word-wiping cloth and the glue roller, ensure that the word-wiping cloth can drive the glue roller to rotate when it moves, and ensure smooth gluing. At the same time, the guide roller is slidably connected to the liquid storage tank. When the tension on the word-wiping cloth increases, the guide roller can be raised to adapt to the tension change of the word-wiping cloth. It is also equivalent to the constant tension device on the existing word-wiping machine, but the structure is simpler, thereby reducing the cost of the word-wiping machine.

[0025] 4) Cloth placing device. In the improved cloth placing device, the cloth placing motor is eliminated, the cost of the eraser is reduced, and a brake mechanism is added. The brake mechanism has a simple structure and low cost. The brake mechanism can quickly stop the rotation of the cloth placing rod after the cloth collecting motor stops working and the eraser loses traction, so that the cloth placing rod continues to rotate due to inertia and the eraser is removed in a short length, thereby preventing the eraser from continuing to be removed and being entangled with other parts, causing equipment failure, and improving production efficiency.

[0026] 5) The cloth collecting device and the cloth mopping device share one motor, which reduces the number of motors and the cost of the word erasing machine. In addition, a single motor is used so that the word erasing cloth is only subjected to one traction force, and the word erasing cloth maintains synchronous movement as a whole, 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 word erasing machine, the word erasing cloth is driven by three motors. When any motor fails, it is difficult for the word erasing cloth to maintain synchronous movement as a whole. Part of the word erasing cloth may lose power and stop moving, while another part of the word erasing cloth may continue to move. There may also be other equipment failures such as the word erasing cloth being too tight and broken or being too loose and wound around other parts and knotted.

[0027] In summary, the present invention has the advantages of low failure rate and low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view schematic diagram of the present invention.

[0029] Figure 2 It is a right side sectional view of the cloth collecting device.

[0030] Figure 3 It is a stereoscopic view of the mopping device in the rearward direction.

[0031] Figure 4 Schematic diagram of the front view of the liquid storage tank.

[0032] Figure 5 It is a schematic diagram of the connection between the guide roller and the liquid storage tank.

[0033] Figure 6 It is a right side sectional view of the cloth placing device.

[0034] Figure 7 It is a rear view schematic diagram of the cloth placing device.

[0035] Figure 8 It is a three-dimensional schematic diagram of the present invention looking upward from the front.

[0036] The markings in the attached drawings are: 1-frame, 2-transport platform, 3-erasing device, 4-cloth mopping device, 5-liquid storage tank, 6-cloth collecting device, 7-cloth placing device; 401-cloth 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-gluing Roller, 503-guide plate, 504-groove, 505-compression spring, 506-slider, 507-slide; 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

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0038] 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, the conveying platform 2 is a belt conveyor, an wiping device 3 is provided above the conveying platform 2, and a mopping device 4 and a liquid storage tank 5 are provided on the front and rear sides of the wiping device 3 respectively; a cloth collecting device 6 and a cloth placing device 7 are provided on the front and rear sides of the upper part of the frame 1 respectively. In the initial state, the wiping cloth is on the cloth placing device 7, passes through the liquid storage tank 5, the wiping device 3, the mopping device 4 in sequence, and finally enters the cloth collecting device 6. The wiping cloth between the cloth placing device 7 and the liquid storage tank is in an inclined state. The characteristics are as follows,

[0039] like Figure 2 As shown, the cloth collecting device 6 includes a cloth collecting roller 601, a first rotating shaft 602 with one end passing through the frame 1 is arranged on the shaft of the cloth collecting roller 601, the first rotating shaft 602 is rotatably connected to the frame 1, an adjusting nut 603 is arranged at the end of the first rotating shaft 602, a first friction disc 604 passed by the first rotating shaft 602 is arranged on one side of the adjusting nut 603, a spring 608 is arranged 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, the first friction disc 604 is slidably connected to the first rotating shaft 602 in the axial direction, a first sprocket 605 passed by the first rotating shaft 602 is arranged on one side of the first friction disc 604, the first sprocket 605 is bearing-connected to the first rotating shaft 602, a second friction disc 606 fitted with the first friction disc 604 is arranged on the first sprocket 605, and a cloth collecting motor 607 fixed to the frame 1 is connected to the first sprocket 605.

[0040] The working principle of the cloth collecting device 6 is as follows: the spring 608 presses the first friction disc 604 onto the second friction disc 606, a friction connection is established between the two friction discs, the first sprocket 605 obtains the driving force from the cloth collecting motor 607 and rotates, 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, the cloth collecting roller 601 performs the cloth collecting action, and rolls the word-wiping cloth onto the cloth collecting roller 601. When the word-wiping cloth is stuck, the resistance of the word-wiping cloth to the cloth collecting roller 601 increases, the friction between the second friction disc 606 and the first friction disc 604 is not enough to overcome the resistance of the cloth collecting roller 601, the cloth collecting roller 601 stops rotating, the tension on the word-wiping cloth stops increasing, and the word-wiping cloth is prevented from being pulled apart. By changing the axial position of the adjusting nut 603 on the first rotating shaft 602 and the preload force of the spring 608, the maximum torque that can be transmitted between the two friction discs is changed, thereby changing the maximum traction force of the cloth collecting device 6 on the word erasing cloth.

[0041] like Figure 3 As shown, the mopping device 4 includes 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, the mopping roller 401 is rotatably connected to the support blocks 402, 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.

[0042] A cloth pressing roller 410 is provided on one side of the mop roller 401, and a second rotating shaft 408 is provided in the axial direction of the cloth pressing roller 410. The cloth pressing roller 410 is bearing-connected with the second rotating shaft 408, and a groove 409 is provided on the top surface of the support block 402 through which the second rotating shaft 408 passes. The wipe cloth passes around the bottom of the mop roller 401, and when the tension of the wipe cloth increases to a certain extent, the mop roller 401 can be raised to play a role of tension buffering.

[0043] The working principle of the mopping device 4 is as follows: the cloth collecting motor 607 drives the fourth sprocket 406 to rotate, the fourth sprocket 406 drives the mopping roller 401 to rotate through the second chain 407, the mopping roller 401 rotates the second sprocket 403, and the second sprocket 403 rotates the first sprocket 605 through 405.

[0044] like Figure 4 and Figure 5As shown, the liquid storage tank 5 is fixed to the frame 1, and the liquid storage tank 5 is provided with erasing liquid. Two guide rollers 501 are provided at the upper part of the inner side of the liquid storage tank 5, and the guide rollers 501 are located above the liquid level of the erasing liquid. Both ends of the guide rollers 501 are provided with sliders 506 fixed to the liquid storage tank 5, and the inner side of the sliders 506 is provided with a vertical slide 507, and the end of the guide roller 501 extends into the slide 507. The slide 507 is provided with a compression spring 505, and the compression spring 505 is located on the upper side of the guide roller 501. The two ends of the guide roller 501 are preferably set as quadrangular prism-shaped square heads, and the width of the square head matches the width of the slide 507. A glue roller 502 is provided between the two guide rollers 501, the bottom of the glue roller 502 is immersed in the erasing liquid, and the glue roller 502 is preferably made of light material and hollow structure, so as to reduce the weight and facilitate smooth rotation under a small torque, and both ends of the glue roller 502 are connected to the bearings of the liquid storage tank 5, and the liquid storage tank 5 is bent outward toward the side wall of the erasing device 3 to form a guide plate 503. A plurality of grooves 504 are provided on the outer peripheral surface of the glue roller 502.

[0045] The principle of the liquid storage tank 5 is that the writing cloth passes around the bottom of one of the guide rollers 501, then passes around the top of the glue roller 502, passes around the bottom of the other guide roller 501, and finally passes around the guide plate 503. The tension of the writing cloth during movement drives the glue roller 502 to rotate, and the glue roller 502 carries the writing liquid coating film onto the writing cloth. The setting of the groove 504 can reduce the glue amount of the glue roller 502, and at the same time increase the friction between the glue roller 502 and the writing cloth, ensuring that the glue roller 502 can rotate and glue under the drive of the writing cloth.

[0046] like Figure 6 As shown, the cloth placing device 7 comprises a cloth placing rod 701, one end of which is rotatably connected to the frame 1, and a brake mechanism is provided on the cloth outlet side of the cloth placing rod 701. The brake mechanism comprises a gear 706 fixed on 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. The other end of the connecting rod 703 is provided with a top 704 that matches the tooth groove on the gear 706. The top 704 is connected to the connecting rod 703 through a leaf spring 705. The top 704 is located on the lower side of the gear.

[0047] Working principle of cloth placing device 7: under the gravity of detection roller 702, connecting rod 703 rotates, so that detection roller 702 rotates downward and falls on the inclined word-wiping cloth between cloth placing device 7 and liquid storage tank 5. When the word-wiping machine is in working state, the word-wiping cloth is tightened, and the word-wiping cloth gives upward force to detection roller 702, and top 704 is separated from gear 706, and cloth placing rod 701 can rotate freely, ensuring that the word-wiping cloth on cloth placing rod 701 can be smoothly disengaged. When the word-wiping machine stops, the word-wiping cloth loses traction, and cloth placing rod 701 continues to rotate under the inertia, and the word-wiping cloth on cloth placing rod 701 continues to be disengaged, and the tension on the word-wiping cloth disappears, and the detection roller 702 drops in height, driving connecting rod 703 to rotate, so that top 704 contacts gear 706, and the gear decelerates, so that cloth placing rod 701 stops rotating at a relatively fast speed, avoiding excessive disengagement of word-wiping cloth and winding around other parts to cause equipment failure. The purpose of providing the leaf spring 705 is to prevent the gear 706 from getting stuck instantly and causing excessive impact.

[0048] How to use: Figure 1 As shown, the rolled word-wiping cloth is initially wound on the cloth-releasing roller 701, and one end of the word-wiping cloth is led out, in order: passing from the lower side of the detection roller 702, bypassing from the bottom of one of the guide rollers 501, bypassing from the top of the glue roller 502, bypassing from the bottom of the other guide roller 501, bypassing from the guide plate 503, bending through the word-wiping device 3, bypassing from the mopping roller 401, from the cloth-pressing roller 410, and then connected to the cloth-collecting roller 601. When the cloth-collecting motor 607 is started, the word-wiping cloth moves and transfers from the cloth-releasing roller 701 to the cloth-collecting roller 601. The license plate is placed on the feeding end (front side of the frame 1) on the left side of the conveying platform 2, and the license plate moves to the right. The word-wiping cloth and the license plate move in opposite directions, and make relative motion friction, so that the word-wiping cloth wipes off the ink on the convex characters of the license plate.

[0049] In the description of the embodiments, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation.

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), a first rotating shaft (602) with one end passing through the frame (1) is provided on the axis of the cloth collecting roller (601), 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, 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).

10. The method for using the high-efficiency and low-cost license plate eraser according to any one of claims 1 to 9, characterized in that: The maximum traction force of the cloth collecting device (6) on the word-erasing cloth is changed by changing the axial position of the adjusting nut (603) on the first rotating shaft (602).

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