High efficiency spray eraser

Abstract

This invention discloses a high-efficiency spray-on erasing machine, comprising a frame with a conveyor platform on the frame. Above the conveyor platform are a cloth feeding device, a liquid storage tank, an erasing device, a cloth dragging device, and a cloth taking-up device. The cloth feeding device holds a roll of non-woven fabric, which passes sequentially through the liquid storage tank, the erasing device, and the cloth dragging device before connecting to the cloth taking-up device. A replenishment tank, located below the conveyor platform, is mounted on the frame and stores erasing liquid. A spray head is located within the liquid storage tank and connected to the replenishment tank via a water pump. A return water pipe is located at the bottom of the liquid storage tank, connecting to the replenishment tank. The erasing liquid in the replenishment tank is pumped to the replenishment tank, atomized by the spray head, and mostly sprayed onto the non-woven fabric; the remainder returns to the liquid storage tank via the return water pipe. This invention has the advantages of low production cost, good erasing effect, and minimal odor.

Description

Technical Field

[0001] This invention belongs to the field of license plate erasing machines, and particularly relates to a high-efficiency spray erasing machine. Background Technology

[0002] The ink on embossed characters on license plates is usually removed using a letter erasing machine to expose the background color. Existing letter erasing machines, such as the high-efficiency, low-cost license plate letter erasing machine in application number 202411734506.5, include a frame with several components for maintaining the movement trajectory of the non-woven fabric. A horizontal conveyor platform is mounted on the frame, and above the platform are a fabric feeding device, a liquid tank, an erasing device, a fabric dragging device, and a fabric taking-up device. The liquid tank contains an adhesive roller, the lower part of which is immersed in the erasing liquid inside the tank. The fabric feeding device holds a roll of non-woven fabric, which sequentially passes through the liquid tank, the erasing device, and the... The cloth-pulling device is connected to the cloth-receiving device. The cloth-pulling device drives the cloth-receiving roller of the cloth-receiving device to rotate and wind the non-woven fabric. The non-woven fabric moves from the cloth-laying device to the cloth-receiving device. During the movement of the non-woven fabric, it first passes through the glue-applying roller of the liquid storage tank. The glue-applying roller rotates under the friction of the non-woven fabric, transferring the erasing liquid onto the non-woven fabric. The non-woven fabric then passes through the erasing device. The license plate is carried by the conveyor platform and also passes through the erasing device. The license plate and the non-woven fabric move in opposite directions and generate relative friction. With the assistance of the erasing liquid, the ink on the license plate is wiped off, exposing the background color.

[0003] However, during use, it was found that the erasing fluid in the reservoir was continuously carried away by the non-woven fabric, causing the fluid level to gradually decrease. This reduced the immersion height of the coating roller in the fluid, resulting in less fluid remaining on the non-woven fabric. This could lead to incomplete ink removal from the license plate due to insufficient fluid, necessitating timely replenishment of the reservoir. However, the amount replenished at one time cannot be too large. Too much fluid would cause the fluid level to be too high, resulting in excessive immersion of the coating roller and excessive fluid on the non-woven fabric. Overly wet non-woven fabric could then be squeezed out during erasing, causing dripping and affecting the paint on the concave areas of the license plate that do not need to be removed. Therefore, the existing erasing machine requires frequent replenishment of the erasing fluid, reducing production efficiency. Even with frequent replenishment, it is impossible to precisely control the amount of fluid carried on the non-woven fabric. The amount can only be controlled between meeting the erasing needs and preventing squeezing, with a large fluctuation range. The minimum and maximum values ​​differ by several times, resulting in significant waste of the erasing fluid and increased production costs. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency spray-on type erasing machine. This invention has the advantages of low production cost, good type erasing effect, and minimal odor generation.

[0005] The technical solution of this invention: A high-efficiency spray erasing machine includes a frame, a conveying platform on the frame, a cloth feeding device, a liquid storage tank, an erasing device, a cloth dragging device, and a cloth taking device on the upper side of the conveying platform. The cloth feeding device has a roll of non-woven fabric, which passes through the liquid storage tank, the erasing device, and the cloth dragging device in sequence before being connected to the cloth taking device. A replenishment tank located below the conveying platform is provided on the frame, and the replenishment tank stores erasing liquid. A spray head is provided in the liquid storage tank, and the spray head is connected to the replenishment tank through a water pump. A return water pipe connected to the replenishment tank is provided at the bottom of the liquid storage tank. The erasing liquid in the replenishment tank is pumped to the replenishment tank by the water pump, and after being atomized by the spray head, most of it is sprayed onto the non-woven fabric, while the remainder returns to the liquid storage tank through the return water pipe.

[0006] In the aforementioned high-efficiency spray-on letter erasing machine, the frame is equipped with a closed housing. The cloth feeding device, liquid storage tank, letter erasing device, cloth dragging device, and cloth collecting device are all located inside the housing. Both ends of the conveyor platform are located outside the housing, and the sides of the housing have openings for vehicle license plates to enter and exit the conveyor platform. The letter erasing liquid is atomized and sprayed onto the non-woven fabric, resulting in more precise dosage and reducing the amount of letter erasing liquid used.

[0007] In the aforementioned high-efficiency spray-on erasing machine, the top of the housing is equipped with an exhaust mechanism, and the frame is equipped with at least two guide rollers for guiding the nonwoven fabric through the air intake side of the exhaust mechanism. The airflow generated by the exhaust mechanism promotes the evaporation of the erasing liquid on the nonwoven fabric, reducing the amount of liquid on the nonwoven fabric collected in the fabric collection device. After the entire roll of nonwoven fabric is removed, it has low irritation and causes minimal harm to workers.

[0008] In the aforementioned high-efficiency spray wiping machine, the liquid storage tank is provided with a cloth inlet and a cloth outlet, both of which are higher than the wiping device. The non-woven fabric coming out of the cloth feeding device enters the liquid storage tank through the cloth inlet and leaves the liquid storage tank through the cloth outlet. The liquid storage tank is provided with a steering component for limiting the movement trajectory of the non-woven fabric within the liquid storage tank.

[0009] In the aforementioned high-efficiency spray-on erasing machine, a wetting mechanism is provided at the fabric outlet. The wetting mechanism includes a lower roller, and an adjustable upper roller is provided above the lower roller. The nonwoven fabric passes between the upper and lower rollers. The wetting mechanism can promote the penetration of the erasing liquid into the nonwoven fabric, open the capillary channels of the nonwoven fabric, and improve the erasing effect.

[0010] In the aforementioned high-efficiency spray erasing machine, the lower roller includes a lower rotating tube, and the inner side of the lower rotating tube is provided with a lower rotating shaft fixed to the liquid storage tank. The lower rotating shaft and the lower rotating tube are connected by bearings, and both ends of the lower rotating shaft are located on the outside of the liquid storage tank.

[0011] The upper roller includes an upper rotating tube, and an upper rotating shaft that is slidably connected to the liquid storage tank is provided on the inner side of the upper rotating tube. The upper rotating shaft and the upper rotating tube are connected by a bearing. Both ends of the upper rotating shaft are located on the outer side of the liquid storage tank. Both ends of the upper rotating shaft are provided with adjusting bolts. The adjusting bolts pass through the upper rotating shaft and are connected to the lower rotating shaft. A spiral spring is sleeved on the adjusting bolt, and the spring is located between the upper rotating shaft and the lower rotating shaft.

[0012] In the aforementioned high-efficiency spray erasing machine, in the direction of movement of the nonwoven fabric, the steering assembly includes a first steering roller, a second steering roller, and a third steering roller. The first steering roller is located below the fabric inlet. The first, second, and third steering rollers are all perpendicular to the feeding direction of the conveying platform. The second and third steering rollers are located on opposite sides below the spray head, and the spray direction of the spray head points between the second and third steering rollers.

[0013] In the aforementioned high-efficiency spray-on erasing machine, in the direction of movement of the nonwoven fabric, the steering assembly includes a fourth steering roller, a fifth steering roller, a sixth steering roller, a seventh steering roller, an eighth steering roller, a ninth steering roller, a tenth steering roller, and an eleventh steering roller, with the fourth steering roller located below the fabric inlet.

[0014] The fourth, fifth, sixth, eighth, ninth, and tenth steering rollers are all perpendicular to the feeding direction of the conveyor platform, while the seventh steering roller is parallel to the feeding direction of the conveyor platform.

[0015] The nonwoven fabric moves in the same direction after passing over the fifth and ninth steering rollers respectively. The sixth and ninth steering rollers approach each other, and the gap width formed between the sixth and ninth steering rollers is two to five times the thickness of the nonwoven fabric. The spray direction of the spray head is pointed between the sixth and ninth steering rollers.

[0016] In the aforementioned high-efficiency spray-on erasing machine, the steering assembly includes a twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, twenty-first, twenty-second, twenty-third, twenty-fourth, and twenty-fifth steering roller in the direction of nonwoven fabric movement. The twelfth steering roller is located below the fabric inlet.

[0017] The twelfth, thirteenth, fourteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, twenty-first, twenty-third, twenty-fourth, and twenty-fifth steering rollers are all perpendicular to the feeding direction of the conveyor platform, while the fifteenth and twenty-second steering rollers are parallel to the feeding direction of the conveyor platform.

[0018] After the nonwoven fabric passes over the thirteenth and eighteenth steering rollers, its movement direction remains vertically downward.

[0019] The fourteenth and eighteenth steering rollers are close to each other, and the gap between them is two to five times the thickness of the nonwoven fabric. The spray head is directed between the fourteenth and eighteenth steering rollers.

[0020] The twelfth and twentieth steering rollers are both located close to the inner wall of the liquid storage tank and are symmetrically distributed about the spray head.

[0021] The seventeenth and twenty-fourth steering rollers approach each other and form a gap of 1.8-2 times the thickness of the nonwoven fabric.

[0022] In the aforementioned high-efficiency spray erasing machine, the replenishment tank is equipped with a liquid level alarm, the detection end of which is located inside the replenishment tank, and the top of the replenishment tank is equipped with a liquid filling port.

[0023] Compared with the prior art, the present invention has made the following improvements based on the existing license plate erasing machine:

[0024] First, the gluing roller in the liquid storage tank has been eliminated, and a spray head has been installed in the liquid storage tank. The spray head is connected to the replenishment tank through a water pump. The erasing liquid in the replenishment tank is atomized by the spray head under the action of the water pump and sprayed onto the non-woven fabric. The spraying speed is stable and can be precisely controlled to just meet the need for erasing, with the amount exceeding the limit. This ensures efficient utilization and reduces waste of erasing liquid. Erasing liquid that is not sprayed onto the non-woven fabric will also flow back to the replenishment tank for reuse, thereby reducing production costs.

[0025] Secondly, a wetting mechanism was added to the outlet of the liquid storage tank. When the nonwoven fabric passes through the wetting mechanism, it is squeezed by the lower and upper rollers, causing the wiping liquid remaining on the surface of the nonwoven fabric to penetrate into the nonwoven fabric, establishing capillary channels in the nonwoven fabric and improving the wiping effect.

[0026] Third, an outer casing was added, and an exhaust mechanism was installed on the casing to make the lettering process take place in a relatively closed environment. The exhaust mechanism is used to discharge the volatile lettering liquid components in the casing to the outside of the workshop, so as to avoid the lettering liquid evaporating into the workshop and causing odors.

[0027] In summary, this invention has the advantages of low production cost, good erasing effect, and minimal odor. Attached Figure Description

[0028] Figure 1 This is a front view schematic diagram of Example 1.

[0029] Figure 2 This is a front view schematic diagram of the liquid storage tank in Example 1.

[0030] Figure 3 This is a left-side view of one end of the wetting mechanism.

[0031] Figure 4 This is a front view schematic diagram of the liquid storage tank in Example 2.

[0032] Figure 5 This is a front view schematic diagram of the liquid storage tank in Example 3.

[0033] The labels in the attached diagram are as follows: 1-Frame, 2-Conveying platform, 3-Fabric feeding device, 4-Liquid storage tank, 5-Erasing device, 6-Fabric mopping device, 7-Fabric taking device, 8-Non-woven fabric, 9-Liquid replenishment tank, 10-Spray head, 11-Water pump, 12-Return water pipe, 13-Housing, 14-Exhaust mechanism, 15-Fabric inlet, 16-Fabric outlet, 17-Steering assembly, 18-Wetting mechanism, 19-Lower roller, 20-Upper roller, 21-Lower rotating pipe, 22-Lower rotating shaft, 23-Upper rotating pipe, 24-Upper rotating shaft, 25-Adjusting bolt, 26-Spring, 27-First steering roller, 28-Second steering roller, 29-Third steering roller, 30-Fourth steering roller, 31-Fifth steering roller 32-Sixth steering roller, 33-Seventh steering roller, 34-Eighth steering roller, 35-Ninth steering roller, 36-Tenth steering roller, 37-Eleventh steering roller, 38-Twelfth steering roller, 39-Thirteenth steering roller, 40-Fourteenth steering roller, 41-Fifteenth steering roller, 42-Sixteenth steering roller, 43-Seventeenth steering roller, 44-Eighteenth steering roller, 45-Nineteenth steering roller, 46-Twentieth steering roller, 47-Twenty-first steering roller, 48-Twenty-second steering roller, 49-Twenty-third steering roller, 50-Twenty-fourth steering roller, 51-Twenty-fifth steering roller, 52-Level alarm, 53-Liquid filling port, 54-Guide roller. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0035] Example 1: A high-efficiency spray-on erasing machine, such as Figure 1 As shown, the device includes a frame 1, on which a conveyor platform 2 is mounted. On the upper side of the conveyor platform 2 are a fabric feeding device 3, a liquid storage tank 4, a lettering wiping device 5, a fabric dragging device 6, and a fabric take-up device 7. A roll of non-woven fabric 8 is mounted on the fabric feeding device 3. The non-woven fabric 8 passes sequentially through the liquid storage tank 4, the lettering wiping device 5, and the fabric dragging device 6 before connecting to the fabric take-up device 7. Its features are as follows:

[0036] The frame 1 is equipped with a replenishment tank 9 located below the conveyor platform 2. The replenishment tank 9 stores erasing fluid. The storage tank 4 is equipped with a spray head 10, which is fixed to the storage tank 4. The spray head 10 is connected to the replenishment tank 9 through a water pump 11. The bottom of the storage tank 4 is equipped with a return water pipe 12 connected to the replenishment tank 9. The erasing fluid in the replenishment tank 9 is transported to the replenishment tank 9 by the water pump 11. After being atomized by the spray head 10, most of it is sprayed onto the non-woven fabric 8, and the rest returns to the storage tank 4 through the return water pipe 12.

[0037] The frame 1 is equipped with a closed housing 13. The cloth feeding device 3, liquid storage tank 4, wiping device 5, cloth pulling device 6 and cloth taking device 7 are all located inside the housing 13. Both ends of the conveying platform 2 are located outside the housing 13. The housing 13 has openings on both sides for the license plates of vehicles to enter and exit the conveying platform 2.

[0038] The top of the housing 13 is equipped with an exhaust mechanism 14, which includes an exhaust pipe and a fan located inside the exhaust pipe. The outlet of the exhaust pipe leads outside the workshop and can be connected to an external filter. The frame 1 is equipped with three guide rollers 54 for guiding the nonwoven fabric through the air inlet side of the exhaust mechanism 14. The airflow generated by the exhaust mechanism 14 promotes the evaporation of the wiping liquid on the nonwoven fabric, reducing the amount of liquid on the nonwoven fabric collected in the take-up device 7. After the entire roll of nonwoven fabric is removed, it has less irritation and causes less harm to workers.

[0039] like Figure 2 As shown, the liquid storage tank 4 is provided with a fabric inlet 15 and a fabric outlet 16. Both the fabric inlet 15 and the fabric outlet 16 are higher than the wiping device 5. The non-woven fabric 8 coming out of the fabric feeding device 3 enters the liquid storage tank 4 through the fabric inlet 15 and leaves the liquid storage tank 4 through the fabric outlet 16. The liquid storage tank 4 is provided with a steering component 17 for limiting the movement trajectory of the non-woven fabric 8 within the liquid storage tank 4.

[0040] In the direction of movement of the nonwoven fabric 8, the steering assembly 17 includes a first steering roller 27, a second steering roller 28, and a third steering roller 29. The first steering roller 27, the second steering roller 28, and the third steering roller 29 are all fixedly or rotatably connected to the liquid storage tank. The first steering roller 27 is located below the inlet 15. The first steering roller 27, the second steering roller 28, and the third steering roller 29 are all perpendicular to the feeding direction of the conveying platform 2. The second steering roller 28 and the third steering roller 29 are located on both sides below the spray head 10, and the spraying direction of the spray head 10 points between the second steering roller 28 and the third steering roller 29.

[0041] A wetting mechanism 18 is provided at the fabric outlet 16. The wetting mechanism 18 includes a lower roller 19. An upper roller 20 with adjustable height is provided on the upper side of the lower roller 19. The nonwoven fabric 8 passes through the upper roller 20 and the lower roller 19.

[0042] The lower roller 19 includes a lower rotating tube 21. The inner side of the lower rotating tube 21 is provided with a lower rotating shaft 22 fixed to the liquid storage tank 4. The lower rotating shaft 22 and the lower rotating tube 21 are connected by bearings. Both ends of the lower rotating shaft 22 are located on the outer side of the liquid storage tank 4.

[0043] The upper roller 20 includes an upper rotating tube 23. An upper rotating shaft 24, slidably connected to the liquid storage tank 4, is located inside the upper rotating tube 23. The upper rotating shaft 24 and the upper rotating tube 23 are connected by bearings. Both ends of the upper rotating shaft 24 are located outside the liquid storage tank 4. Adjusting bolts 25 are provided at both ends of the upper rotating shaft 24. The adjusting bolts 25 pass through the upper rotating shaft 24 and are screwed onto the lower rotating shaft 22. The adjusting bolts 25 and the upper rotating shaft 24 are clearance-fitted. A spiral spring 26 is fitted onto the adjusting bolts 25, located between the upper rotating shaft 24 and the lower rotating shaft 22. The distance between the upper roller 20 and the lower roller 19 is changed by adjusting the bolts 25. The distance between them should be less than the thickness of the nonwoven fabric, preferably 0.6-0.7 times the thickness of the nonwoven fabric.

[0044] The replenishment tank 9 is equipped with a level alarm 52, the detection end of which is located inside the replenishment tank 9. The top of the replenishment tank 9 is equipped with a filling port 53. When the level of erasing fluid in the replenishment tank 9 is low, the level alarm 52 will emit an audible and visual alarm, indicating that erasing fluid needs to be added to the replenishment tank 9 through the filling port 53.

[0045] In Example 1, the liquid storage tank 4 no longer serves the function of storing liquid, but instead serves to recycle the erasing fluid and prevent the spread of liquid mist.

[0046] Example 1 is an improvement on the license plate erasing machine in application number 202411734506.5, including: First, setting up a housing 13, and setting up an exhaust mechanism on the housing 13 to make the erasing process take place in a relatively closed environment, so as to avoid the erasing liquid from evaporating into the workshop and causing odor in the workshop. The exhaust mechanism is used to discharge the evaporating erasing liquid components in the housing 13 to the outside of the workshop. Secondly, the gluing roller in the liquid storage tank 4 has been eliminated, and a spray head 10 has been installed in the liquid storage tank 4. The spray head 10 is connected to the replenishment tank 9 through a water pump 11. The erasing liquid in the replenishment tank 9 is atomized and sprayed from the spray head 10 onto the moving non-woven fabric 8 under the action of the water pump 11. The spray shape is conical, and the spray speed is stable and can be precisely controlled, effectively reducing the waste of erasing liquid. Most of the erasing liquid is sprayed onto the non-woven fabric, and a small amount of erasing liquid will exceed the non-woven fabric, condense into beads on the inner wall of the liquid storage tank, slide down, and flow back into the replenishment tank 9 through the return water pipe 12, avoiding waste. Third, a wetting mechanism 18 has been added. Since the nonwoven fabric exiting the feeding device 3 is still relatively dry and its internal capillary channels are not yet open, the atomized erasing liquid only remains on the back of the nonwoven fabric and cannot reach the front. This results in poor wetting of the nonwoven fabric, and the paint on the license plate, after being dissolved by the erasing liquid, cannot be quickly absorbed into the nonwoven fabric through the capillary channels, leading to a poor erasing effect. However, when the nonwoven fabric passes through the wetting mechanism 18, it is squeezed by the lower roller 19 and the upper roller 20. Under pressure, the erasing liquid penetrates into the nonwoven fabric, establishing capillary channels within it, thus improving the erasing effect. The rest of the usage method remains unchanged.

[0047] Example 2: Based on Example 1, the steering assembly 17 is modified. In the direction of movement of the nonwoven fabric 8, the steering assembly 17 includes a fourth steering roller 30, a fifth steering roller 31, a sixth steering roller 32, a seventh steering roller 33, an eighth steering roller 34, a ninth steering roller 35, a tenth steering roller 36, and an eleventh steering roller 37. The fourth steering roller 30 is located below the inlet 15. All steering rollers in Example 2 are preferably rotatably connected to the liquid storage tank to reduce the traction resistance of the nonwoven fabric.

[0048] The fourth steering roller 30, the fifth steering roller 31, the sixth steering roller 32, the eighth steering roller 34, the ninth steering roller 35 and the tenth steering roller 36 are all perpendicular to the feeding direction of the conveying platform 2, and the seventh steering roller 33 is parallel to the feeding direction of the conveying platform 2.

[0049] The movement of the nonwoven fabric 8 after passing over the fifth steering roller 31 and the ninth steering roller 35 is downward and on the same plane. The sixth steering roller 32 and the ninth steering roller 35 are close to each other. The gap width formed between the sixth steering roller 32 and the ninth steering roller 35 is three times the thickness of the nonwoven fabric 8. The spray direction of the spray head 10 is between the sixth steering roller 32 and the ninth steering roller 35.

[0050] In Example 2, the nonwoven fabric between the fifth and sixth steering rollers 31 and 32 has its front side facing the spray head 10 and is coated with erasing liquid. The nonwoven fabric is flipped at the seventh steering roller 33 so that the back side of the nonwoven fabric between the ninth and tenth steering rollers 35 and 36 faces the spray head 10. The erasing liquid is sprayed on both sides of the nonwoven fabric. When it passes through the wetting mechanism 18, the erasing liquid only needs to pass through the thickness of the nonwoven fabric to achieve full wetting of the nonwoven fabric. The wetting is more thorough and the effect is better. While maintaining the same erasing effect as in Example 1, the amount of erasing liquid can be reduced.

[0051] Example 3: Based on Example 1, the steering assembly 17 is modified. In the direction of movement of the nonwoven fabric 8, the steering assembly 17 includes a twelfth steering roller 38, a thirteenth steering roller 39, a fourteenth steering roller 40, a fifteenth steering roller 41, a sixteenth steering roller 42, a seventeenth steering roller 43, an eighteenth steering roller 44, a nineteenth steering roller 45, a twentieth steering roller 46, a twenty-first steering roller 47, a twenty-second steering roller 48, a twenty-third steering roller 49, a twenty-fourth steering roller 50, and a twenty-fifth steering roller 51. The twelfth steering roller 38 is located below the fabric inlet 15. All steering rollers in Example 3 are preferably rotatably connected to the liquid storage tank.

[0052] The twelfth steering roller 38, the thirteenth steering roller 39, the fourteenth steering roller 40, the sixteenth steering roller 42, the seventeenth steering roller 43, the eighteenth steering roller 44, the nineteenth steering roller 45, the twentieth steering roller 46, the twenty-first steering roller 47, the twenty-third steering roller 49, the twenty-fourth steering roller 50, and the twenty-fifth steering roller 51 are all perpendicular to the feeding direction of the conveyor platform 2, while the fifteenth steering roller 41 and the twenty-second steering roller 48 are both parallel to the feeding direction of the conveyor platform 2.

[0053] The nonwoven fabric 8 moves vertically downwards after passing over the thirteenth turning roller 39 and the eighteenth turning roller 44 respectively.

[0054] The fourteenth steering roller 40 and the eighteenth steering roller 44 are close to each other, and the gap width formed between the fourteenth steering roller 40 and the eighteenth steering roller 44 is four times the thickness of the nonwoven fabric 8. The spraying direction of the spray head 10 is directed between the fourteenth steering roller 40 and the eighteenth steering roller 44.

[0055] The twelfth steering roller 38 and the twentieth steering roller 46 are both close to the inner wall of the liquid storage tank 4 and are symmetrically distributed about the spray head 10.

[0056] The seventeenth steering roller 43 and the twenty-fourth steering roller 50 approach each other and form a gap of 1.9 times the thickness of the nonwoven fabric 8.

[0057] In Example 3, similar to Example 2, the front side of the nonwoven fabric between the thirteenth steering roller 39 and the fourteenth steering roller 40 is sprayed, and the back side of the nonwoven fabric between the eighteenth steering roller 44 and the nineteenth steering roller 45 is sprayed, with liquid on both sides of the nonwoven fabric.

[0058] The nonwoven fabric on the seventeenth steering roller 43 has its front side facing down, while the nonwoven fabric on the twenty-fourth steering roller 50 has its back side facing up. There are two layers of nonwoven fabric between the seventeenth steering roller 43 and the twenty-fourth steering roller 50, and their movement directions are opposite. The wiping liquid on the front and back of the nonwoven fabric is exchanged and coated with each other at this point, making the liquid distribution on the front and back of the nonwoven fabric more even. Slight compression is also performed, which initially opens and establishes the capillary channels inside the nonwoven fabric, making the wiping liquid more fully and evenly soaked in the nonwoven fabric, resulting in better performance. While maintaining the same wiping effect as in Example 1, the amount of wiping liquid used can be reduced.

[0059] Because the spray head 10 is shielded by non-woven fabric on both the top and bottom, with the front and back sides of the non-woven fabric facing the spray head 10 respectively, a portion of the overflowing mist-like erasing liquid is recovered while ensuring uniform spraying on both sides of the non-woven fabric, thus increasing the effective utilization rate of the erasing liquid sprayed from the spray head 10. Although the erasing liquid that does not reach the non-woven fabric will flow back to the replenishment tank, this process will result in some evaporation loss, increasing the amount used.

[0060] Test Example: Comparison between existing letter erasing machines and Examples 1, 2, and 3. In the existing letter erasing machine, each liter of letter erasing liquid completes the erasing of 651 license plates. Example 1 completes 1440 plates, Example 2 completes 1604 plates, and Example 3 completes 1652 plates.

[0061] 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 based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations.

Claims

1. A high-efficiency spray-on letter erasing machine, comprising a frame (1), a conveyor platform (2) on the frame (1), a cloth feeding device (3), a liquid storage tank (4), a letter erasing device (5), a cloth mopping device (6), and a cloth taking-up device (7) on the upper side of the conveyor platform (2), wherein a roll of non-woven fabric (8) is provided on the cloth feeding device (3), and the non-woven fabric (8) passes through the liquid storage tank (4), the letter erasing device (5), and the cloth mopping device (6) in sequence before being connected to the cloth taking-up device (7), characterized in that: The frame (1) is equipped with a replenishment tank (9) located below the conveying platform (2). The replenishment tank (9) stores erasing fluid. The storage tank (4) is equipped with a spray head (10). The spray head (10) is connected to the replenishment tank (9) through a water pump (11). The bottom of the storage tank (4) is equipped with a return water pipe (12) connected to the replenishment tank (9). The erasing fluid in the replenishment tank (9) is transported to the replenishment tank (9) by the water pump (11). After being atomized by the spray head (10), most of it is sprayed onto the non-woven fabric (8), and the rest returns to the storage tank (4) through the return water pipe (12).

2. The high-efficiency spray-on erasing machine according to claim 1, characterized in that: The frame (1) is provided with a closed shell (13). The cloth feeding device (3), liquid storage tank (4), wiping device (5), cloth pulling device (6) and cloth taking device (7) are all located inside the shell (13). Both ends of the conveying platform (2) are located outside the shell (13). The shell (13) has openings on both sides for the license plates of vehicles to enter and exit the conveying platform (2).

3. The high-efficiency spray-on erasing machine according to claim 2, characterized in that: The top of the housing (13) is provided with an exhaust mechanism (14), and the frame (1) is provided with at least two guide rollers (54) for the nonwoven fabric to pass through the air intake side of the exhaust mechanism (14).

4. The high-efficiency spray-on erasing machine according to claim 1, characterized in that: The liquid storage tank (4) is provided with a fabric inlet (15) and a fabric outlet (16). Both the fabric inlet (15) and the fabric outlet (16) are higher than the wiping device (5). The non-woven fabric (8) coming out of the fabric release device (3) enters the liquid storage tank (4) through the fabric inlet (15) and leaves the liquid storage tank (4) through the fabric outlet (16). The liquid storage tank (4) is provided with a steering component (17) for limiting the movement trajectory of the non-woven fabric (8) in the liquid storage tank (4).

5. The high-efficiency spray-on erasing machine according to claim 4, characterized in that: The outlet (16) is provided with a wetting mechanism (18), which includes a lower roller (19). An upper roller (20) with adjustable height is provided on the upper side of the lower roller (19). The nonwoven fabric (8) passes between the upper roller (20) and the lower roller (19).

6. The high-efficiency spray-on erasing machine according to claim 5, characterized in that: The lower roller (19) includes a lower rotating tube (21), and a lower rotating shaft (22) fixed to the liquid storage tank (4) is provided on the inner side of the lower rotating tube (21). The lower rotating shaft (22) and the lower rotating tube (21) are connected by bearings, and both ends of the lower rotating shaft (22) are located on the outer side of the liquid storage tank (4). The upper roller (20) includes an upper rotating tube (23), and an upper rotating shaft (24) is provided on the inner side of the upper rotating tube (23) and slidably connected to the liquid storage tank (4). The upper rotating shaft (24) and the upper rotating tube (23) are connected by bearings. Both ends of the upper rotating shaft (24) are located on the outer side of the liquid storage tank (4). Both ends of the upper rotating shaft (24) are provided with adjusting bolts (25). The adjusting bolts (25) pass through the upper rotating shaft (24) and are connected to the lower rotating shaft (22). A spiral spring (26) is sleeved on the adjusting bolt (25). The spring (26) is located between the upper rotating shaft (24) and the lower rotating shaft (22).

7. The high-efficiency spray-on erasing machine according to claim 5, characterized in that: In the direction of movement of the nonwoven fabric (8), the steering assembly (17) includes a first steering roller (27), a second steering roller (28) and a third steering roller (29). The first steering roller (27) is located below the inlet (15). The first steering roller (27), the second steering roller (28) and the third steering roller (29) are all perpendicular to the feeding direction of the conveying platform (2). The second steering roller (28) and the third steering roller (29) are located on the lower sides of the spray head (10). The spray direction of the spray head (10) points between the second steering roller (28) and the third steering roller (29).

8. The high-efficiency spray-on erasing machine according to claim 5, characterized in that: In the direction of movement of the nonwoven fabric (8), the steering assembly (17) includes a fourth steering roller (30), a fifth steering roller (31), a sixth steering roller (32), a seventh steering roller (33), an eighth steering roller (34), a ninth steering roller (35), a tenth steering roller (36), and an eleventh steering roller (37), with the fourth steering roller (30) located below the inlet (15). The fourth steering roller (30), fifth steering roller (31), sixth steering roller (32), eighth steering roller (34), ninth steering roller (35), and tenth steering roller (36) are all perpendicular to the feeding direction of the conveyor platform (2), while the seventh steering roller (33) is parallel to the feeding direction of the conveyor platform (2). The nonwoven fabric (8) moves in the same direction after passing around the fifth steering roller (31) and the ninth steering roller (35). The sixth steering roller (32) and the ninth steering roller (35) approach each other. The gap width formed between the sixth steering roller (32) and the ninth steering roller (35) is two to five times the thickness of the nonwoven fabric (8). The spray direction of the spray head (10) is between the sixth steering roller (32) and the ninth steering roller (35).

9. The high-efficiency spray-on erasing machine according to claim 1, characterized in that: In the direction of movement of the nonwoven fabric (8), the steering assembly (17) includes a twelfth steering roller (38), a thirteenth steering roller (39), a fourteenth steering roller (40), a fifteenth steering roller (41), a sixteenth steering roller (42), a seventeenth steering roller (43), an eighteenth steering roller (44), a nineteenth steering roller (45), a twentieth steering roller (46), a twenty-first steering roller (47), a twenty-second steering roller (48), a twenty-third steering roller (49), a twenty-fourth steering roller (50), and a twenty-fifth steering roller (51). The twelfth steering roller (38) is located below the inlet (15). The twelfth steering roller (38), the thirteenth steering roller (39), the fourteenth steering roller (40), the sixteenth steering roller (42), the seventeenth steering roller (43), the eighteenth steering roller (44), the nineteenth steering roller (45), the twentieth steering roller (46), the twenty-first steering roller (47), the twenty-third steering roller (49), the twenty-fourth steering roller (50), and the twenty-fifth steering roller (51) are all perpendicular to the feeding direction of the conveyor platform (2), while the fifteenth steering roller (41) and the twenty-second steering roller (48) are parallel to the feeding direction of the conveyor platform (2). The nonwoven fabric (8) moves vertically downwards after passing over the thirteenth steering roller (39) and the eighteenth steering roller (44). The fourteenth steering roller (40) and the eighteenth steering roller (44) are close to each other, and the width of the gap formed between the fourteenth steering roller (40) and the eighteenth steering roller (44) is two to five times the thickness of the nonwoven fabric (8). The spraying direction of the spray head (10) is directed between the fourteenth steering roller (40) and the eighteenth steering roller (44). The twelfth steering roller (38) and the twentieth steering roller (46) are both close to the inner wall of the liquid storage tank (4) and are symmetrically distributed vertically about the spray head (10). The seventeenth steering roller (43) and the twenty-fourth steering roller (50) approach each other and form a gap of 1.8-2 times the thickness of the nonwoven fabric (8).

10. The high-efficiency spray-on erasing machine according to claim 1, characterized in that: The replenishment tank (9) is equipped with a liquid level alarm (52), the detection end of which is located inside the replenishment tank (9), and the top of the replenishment tank (9) is equipped with a liquid filling port (53).

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