A wringing mechanism for a wringer roller

CN224920831UActive Publication Date: 2026-10-30JIANGSU BAOSU MINING & METALLURGY EQUIP CO LTD
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Patent Information

Application Number
CN202522471181.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-21
Publication Date
2026-10-30
Estimated Expiration
2035-11-21

AI Technical Summary

Technical Problem

这种积液不仅造成设备部件的腐蚀、影响传感器的精度,还会给后续的清洁维护带来巨大困难,甚至存在污染生产环境的风险

Benefits of technology

1、本实用新型,通过设置调节机构,利用气缸驱动滑动板移动,一方面直接推动其中一个转辊移动,另一方面通过转动杆、联动杆及驱动杆组成的联动结构带动另一个转辊同步移动,解决了现有技术中挤干设备难以灵活适应不同厚度物料以及双侧压紧通常需要多个动力源导致控制复杂的问题,达到了仅需单一动力源即可实现双转辊同步对向调节、保证物料受力平衡、结构紧凑且适应性强的技术效果。

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Abstract

The utility model discloses a kind of wringing roller wringing mechanisms, belong to mechanical equipment technical field.Mechanism includes support base, support frame, fixed roller and two rotating rollers driven by driving motor.The mechanism further includes adjusting mechanism and cleaning mechanism.Adjusting mechanism includes cylinder and sliding plate, cylinder drives sliding plate to slide, sliding plate is directly pushed one rotating roller on one side, and the other side is through rotating rod, sliding shaft, linkage rod, connecting plate, driving rod and the linkage structure of support shaft, drive another rotating roller synchronous movement, to realize double roller synchronous compression.Cleaning mechanism includes cleaning pad fixed in the bottom of sliding plate, cleaning pad wipes support base when moving with sliding plate, support base is provided with water-absorbing cotton pad in inside.The utility model has realized the synchronous accurate adjustment of double rotating rollers by single power source, compact structure, simultaneously utilize adjusting action to drive cleaning mechanism to work, realized operation and cleaning synchronization, effectively prevent waste liquid accumulation.
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Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a squeezing roller squeezing mechanism. Background Technology

[0002] In industrial production, especially in the processing of slurries, films, or porous materials, extrusion dehydration or extrusion drainage operations are often required. In the production of battery electrode sheets, textiles, or filter media, materials are often impregnated with excess solvent or water, and these excess liquids need to be removed by extrusion to achieve the desired moisture or liquid content standards.

[0003] Most common extrusion mechanisms currently employ a roller structure, where pressure is applied to the material through relatively rotating rollers. However, existing roller extrusion mechanisms, especially those used to process materials of various sizes or thicknesses, have significant shortcomings in pressure regulation and roller spacing adjustment. Many mechanisms use a design where one roller is fixed, and the other roller is adjusted unidirectionally via a screw or hydraulic cylinder. This design is not only structurally complex, but also makes it difficult to achieve precise and synchronous counter-pressure for materials of different thicknesses during adjustment, as the roller's movement trajectory and pressure transmission direction are fixed. When the material thickness changes, manual or semi-automatic adjustments often require a considerable amount of time, resulting in low efficiency.

[0004] More importantly, in some high-precision or environmentally demanding applications, such as electrolyte processing or chemical desolvation, the squeezed liquid or solvent can drip and accumulate on the equipment's base and frame. This accumulation not only corrodes equipment components and affects sensor accuracy but also poses significant challenges to subsequent cleaning and maintenance, and even risks polluting the production environment. While some existing technologies have considered cleaning, they often employ independently installed collection trays or spray rinsing. These methods are either cumbersome or incompletely clean, and lack efficient, automated cleaning mechanisms synchronized with the main squeezing action.

[0005] Therefore, this utility model proposes a squeezing roller squeezing mechanism to solve the shortcomings of the prior art, such as the complexity of the squeezing roller adjustment mechanism, the difficulty in achieving synchronous and precise adjustment of the two rollers, and the lack of an automated cleaning mechanism that is synchronized with the operation. Utility Model Content

[0006] In view of the shortcomings of existing squeeze roller squeezing mechanisms, such as complex double-roller adjustment mechanisms, difficulty in achieving synchronous and precise opposing pressing of the two rollers, and lack of automated cleaning mechanisms synchronized with the operation, this utility model aims to provide a squeeze roller squeezing mechanism with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a squeezing roller squeezing mechanism, including a support base, a support frame, a support block, a drive motor, a fixed roller, a fixed block, an adjustment mechanism, and a cleaning mechanism.

[0008] The adjustment mechanism includes a cylinder and a sliding plate. The cylinder is fixedly installed on the fixed block, and the output end of the cylinder is connected to the sliding plate. The bottom surface of the sliding plate is slidably engaged with the upper surface of the support base. The sliding plate is used to perform linear reciprocating motion along the support base under the drive of the cylinder.

[0009] The adjusting mechanism includes a rotating rod, a sliding shaft, a linkage rod, a connecting plate, a drive rod, a support shaft, and two rotating rollers. One of the rotating rollers is driven along the moving path of the sliding plate and is slidably fitted within the support frame. Simultaneously, the sliding plate is hinged to one end of the rotating rod, and the middle of the rotating rod is rotatably connected to the support base or the support frame as a fixed fulcrum. The other end of the rotating rod is rotatably connected to one end of the linkage rod via the sliding shaft. The other end of the linkage rod is fixedly or rotatably connected to the drive rod via the connecting plate. The end of the drive rod away from the connecting plate is fixedly connected to the support shaft, which is slidably fitted within the support frame and connected to the other rotating roller. Through this linkage structure, when the cylinder extends or retracts, it drives the sliding plate to move, and then, through the linkage of the rotating rod, the linkage rod, and the drive rod, drives the two rotating rollers to move synchronously towards the fixed roller and press them together.

[0010] In addition, the cleaning mechanism includes a cleaning pad, which is fixedly connected to the bottom of the sliding plate, and the bottom surface of the cleaning pad abuts against the surface of the support base. The cleaning pad uses the reciprocating motion of the sliding plate to wipe and clean the surface of the support base.

[0011] Preferably, the support block is fixedly connected to the support base, the drive motor is fixedly installed on the support block, and the output end of the drive motor is drivenly connected to the fixed roller. The drive motor is used to drive the fixed roller to rotate, thereby pulling the material in and conveying it.

[0012] Preferably, the rotating rod in the adjusting mechanism is designed as a lever structure, and the connection between the sliding plate and the rotating rod is provided with an oblong hole or groove. The pin on the sliding plate slides in the oblong hole or groove, effectively accommodating the difference between the arc-shaped trajectory generated at the connection point when the rotating rod rotates and the straight trajectory of the sliding plate, ensuring the smoothness of the movement. When the rotating rod is subjected to force and rotates, a stable traction force is applied to the linkage rod through the sliding shaft, activating the linkage mechanism.

[0013] Preferably, the drive rod has an L-shaped or bent structure, and the connecting plate is located between the linkage rod and the drive rod, serving to convert the angle or extend the connection, so as to smoothly convert the movement of the linkage rod into the thrust of the drive rod to push the support shaft to slide.

[0014] Preferably, the support frame includes two vertically arranged side plates, and the side plates are provided with guide grooves for the movement of the rotating roller and the support shaft; one of the rotating rollers is rotatably mounted at both ends on the bracket extending from the sliding plate, and the other rotating roller is rotatably mounted at both ends on the support shaft, and all movable rollers slide precisely along the guide grooves.

[0015] Preferably, the cleaning mechanism further includes absorbent cotton, a limiting shaft, and a return spring; the support base has an internal cavity, the absorbent cotton is movably installed in the cavity, the absorbent cotton is located below the cleaning pad and its upper surface is in close contact with the lower surface of the cleaning pad, for absorbing moisture.

[0016] Preferably, the limiting shaft is vertically fixed inside the support base and passes through the body of the absorbent cotton; the return spring is sleeved on the outer periphery of the limiting shaft, and the two ends of the return spring abut against the inner wall of the support base and the bottom surface of the absorbent cotton, respectively. The return spring provides a continuous elastic pressing force to push the absorbent cotton against the cleaning pad, so as to ensure that the absorbent cotton is always tightly attached to the cleaning pad and improve the moisture absorption efficiency.

[0017] Preferably, the absorbent cotton is made of highly absorbent sponge or porous fiber material, and the limiting shaft is used to limit the displacement range of the absorbent cotton in the vertical direction to prevent it from leaving the preset position during operation.

[0018] Preferably, the fixed roller and the two rotating rollers are arranged in a triangular or triangular shape; when the cylinder drives the sliding plate to reset, the two rotating rollers move outward synchronously through the reverse transmission of the linkage structure to release the material and accommodate the entry of the next batch of materials of different thicknesses.

[0019] This utility model has the following beneficial effects: 1. This utility model, by setting an adjustment mechanism, uses a cylinder to drive the sliding plate to move. On the one hand, it directly pushes one of the rotating rollers to move, and on the other hand, it drives the other rotating roller to move synchronously through a linkage structure composed of a rotating rod, a linkage rod and a driving rod. This solves the problems in the prior art where the extrusion equipment is difficult to flexibly adapt to materials of different thicknesses and where double-sided pressing usually requires multiple power sources, resulting in complex control. It achieves the technical effect of realizing synchronous counter-adjustment of two rotating rollers with only a single power source, ensuring material force balance, and having a compact structure and strong adaptability.

[0020] 2. This utility model solves the problem in the prior art where waste liquid drips and accumulates on the equipment base during the squeezing operation, which is difficult to clean in time and easily causes equipment corrosion or environmental pollution. It achieves the technical effect of realizing simultaneous operation and cleaning without additional drive device and keeping the equipment operating environment clean.

[0021] 3. This utility model solves the problem in the prior art that the cleaning components are prone to saturation and failure or reduced water absorption efficiency due to poor contact by setting water-absorbing cotton inside the support base and cooperating with the continuous elastic pressing force provided by the reset spring to keep the water-absorbing cotton always tightly attached to the bottom of the cleaning pad. It achieves the technical effect of continuously transferring the moisture on the surface of the cleaning pad to the water-absorbing cotton for storage by utilizing capillary action, ensuring that the cleaning pad maintains high-efficiency adsorption capacity and extending the maintenance cycle. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of a squeezing roller squeezing mechanism proposed in this utility model; Figure 2 This is a schematic diagram of the rotating rod of a squeezing roller squeezing mechanism proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0023] Legend: 1. Support base; 2. Support frame; 3. Fixing block; 4. Adjustment mechanism; 41. Drive assembly; 411. Cylinder; 412. Sliding plate; 42. Rotating rod; 43. Sliding shaft; 44. Linkage rod; 45. Connecting plate; 46. Drive rod; 47. Support shaft; 48. Rotating roller; 49. Fixed roller; 5. Support block; 6. Drive motor; 7. Cleaning mechanism; 71. Cleaning pad; 72. Absorbent cotton; 73. Limiting shaft; 74. Return spring. Detailed Implementation

[0024] Example: Reference Figures 1 to 3 This utility model provides a squeezing roller squeezing mechanism, which aims to solve the problems of insufficient adjustment flexibility of existing squeezing equipment when processing materials of different thicknesses, and the inability to simultaneously clean up the accumulated liquid in the equipment during operation, resulting in environmental pollution.

[0025] like Figure 1 and Figure 2As shown, the device includes a support base 1, which serves as the main load-bearing component, and a support frame 2, which is vertically fixed on the upper surface of the support base 1. The support base 1 provides a stable installation platform for the entire device, while the support frame 2 mainly serves to support and guide the subsequent moving parts. In order to realize the material conveying function, a support block 5 is also provided on the support base 1. The support block 5 is fixedly connected to the support base 1 by bolts or welding. A drive motor 6 is fixedly installed on the support block 5. The drive motor 6 serves as a power source, and its output shaft end is connected to the fixed roller 49, so that the fixed roller 49 can rotate around its own axis, thereby driving the material to be squeezed forward during operation.

[0026] It also includes an adjustment mechanism 4, which mainly consists of a fixed block 3, a drive assembly 41, a rotating rod 42, a sliding shaft 43, a linkage rod 44, a connecting plate 45, a drive rod 46, a support shaft 47, and two rotating rollers 48. The fixed block 3 is fixedly connected to the support base 1 and provides a mounting point for the drive assembly 41. The drive assembly 41 includes a cylinder 411 and a sliding plate 412. The cylinder body of the cylinder 411 is fixedly installed on the side of the fixed block 3, and the end of the telescopic rod of the cylinder 411 is fixedly connected to the sliding plate 412. The bottom surface of the sliding plate 412 slides and engages with the upper surface of the support base 1, allowing the sliding plate 412 to reciprocate linearly along the support base 1 under the drive of the cylinder 411, thereby serving as the power input to drive the entire linkage structure. At the same time, a cleaning mechanism 7 is also provided, in which the cleaning pad 71 is directly fixedly connected to the bottom of the sliding plate 412, and the bottom surface of the cleaning pad 71 always remains in contact with the surface of the support base 1. The movement of the sliding plate 412 drives the cleaning pad 71 to synchronously wipe and clean the surface of the support base 1.

[0027] Reference Figure 1 and Figure 2 The adjustment mechanism 4 includes multiple key linkage components. Its motion chain starts from the sliding plate 412. On the moving path of the sliding plate 412, one of the rotating rollers 48 is directly driven and connected. The two ends of the rotating roller 48 are rotatably mounted on the bracket extending from the sliding plate 412 and slide in the guide groove inside the support frame 2, so that the rotating roller 48 on one side moves closer to or further away from the fixed roller 49 in sync with the movement of the sliding plate 412.

[0028] Meanwhile, to achieve linkage with the other side roller 48, a sliding plate 412 is hinged to one end of a rotating rod 42. The rotating rod 42 is rotatably connected to the support base 1 or support frame 2 around its middle or a fixed point as a fixed fulcrum. When the sliding plate 412 performs linear reciprocating motion, it can drive the rotating rod 42 to rotate around the fixed fulcrum, converting linear motion into rotational motion. The other end of the rotating rod 42 is rotatably connected to one end of a linkage rod 44 through a sliding shaft 43. The presence of the sliding shaft 43 ensures that when the rotating rod 42 rotates, it can still maintain a stable traction effect on the linkage rod 44, thereby ensuring the smoothness of transmission.

[0029] The other end of the linkage rod 44 is fixedly or rotatably connected to the drive rod 46 via the connecting plate 45. The connecting plate 45 serves to change the angle or extend the connection, ensuring that the tension or thrust from the linkage rod 44 is accurately transmitted to the drive rod 46. The drive rod 46 has an L-shaped or bent structure, with its end away from the connecting plate 45 fixedly connected to the support shaft 47. The two ends of the support shaft 47 are slidably fitted in the guide grooves of the support frame 2. Another roller 48 is further rotatably mounted on the support shaft 47.

[0030] Through this multi-stage linkage structure consisting of a sliding plate 412, a rotating rod 42, a linkage rod 44, a drive rod 46, and a support shaft 47, when the cylinder 411 extends, the sliding plate 412 pushes one of the rotating rollers 48 to move, and at the same time, through the lever action, it pulls the other rotating roller 48 to move towards the fixed roller 49. This achieves synchronous and balanced pressing of the material by the two rotating rollers 48, effectively solving the problem of uneven material force caused by unilateral pressing. Furthermore, since the movement of the rotating rollers 48 on both sides originates from the cylinder 411, the mechanism can easily and accurately adapt to the squeezing requirements of materials of different thicknesses.

[0031] Reference Figure 1 The cleaning mechanism 7 further includes an absorbent cotton 72, a limiting shaft 73, and a return spring 74. The support base 1 has an internal cavity, in which the absorbent cotton 72 is movably installed and positioned directly below the cleaning pad 71, with its upper surface in close contact with the lower surface of the cleaning pad 71. To ensure this contact is continuous, the limiting shaft 73 is vertically fixed inside the support base 1 and passes through the body of the absorbent cotton 72. The return spring 74 is sleeved on the outer periphery of the limiting shaft 73, with its two ends abutting against the inner wall of the support base 1 and the bottom surface of the absorbent cotton 72, respectively. The return spring 74 is always in a compressed state, thereby providing a lasting elastic pressing force to push the absorbent cotton 72 upward toward the cleaning pad 71, ensuring that the two are in close contact.

[0032] The absorbent cotton 72 is preferably made of highly absorbent sponge or porous fiber material, which is used to efficiently absorb moisture and impurities transferred by the cleaning pad 71; the limiting shaft 73 is also used to limit the displacement range of the absorbent cotton 72 in the vertical direction, preventing the absorbent cotton 72 from leaving the preset position when it absorbs water and expands or when the equipment vibrates.

[0033] The support frame 2 specifically includes two vertically arranged side plates, which are arranged opposite each other on the support base 1. The side plates are provided with guide grooves for the rotating roller 48 and the support shaft 47 to slide. The two ends of one rotating roller 48 are rotatably mounted on the bracket extending from the sliding plate 412 and slide in the guide groove. The two ends of the other rotating roller 48 are rotatably mounted on the support shaft 47, and the two ends of the support shaft 47 slide in the guide groove.

[0034] The rotating rod 42 is designed as a lever structure; a waist-shaped hole or groove is provided at the connection between the sliding plate 412 and the rotating rod 42, and the pin on the sliding plate 412 slides in the waist-shaped hole or groove, thereby optimizing the conversion efficiency of the linear motion of the sliding plate 412 to the rotational motion of the rotating rod 42 and preventing interference. It effectively adapts to the difference between the arc trajectory generated by the connection point of the rotating rod 42 when it rotates and the linear trajectory of the sliding plate 412, and prevents the mechanism from jamming.

[0035] The body of the drive rod 46 has an L-shaped or bent structure; the connecting plate 45 is set between the linkage rod 44 and the drive rod 46, which plays the role of angle conversion or extension connection, ensuring that the movement of the linkage rod 44 is smoothly transmitted to the drive rod 46. The fixed roller 49 and the two rotating rollers 48 are arranged in a triangular or triangular shape, with the two rotating rollers 48 located on both sides above the fixed roller 49. This layout helps to form a stable and gradual pressing area when the material enters.

[0036] The working principle is as follows: When the squeezing operation is required, the drive motor 6 starts and drives the fixed roller 49 to rotate. The material enters the squeezing area with the fixed roller 49. At this time, the cylinder 411 in the adjustment mechanism 4 starts and extends. The cylinder 411 pushes the sliding plate 412 to slide along the surface of the support base 1. During the sliding process, the sliding plate 412 directly pushes one of the rotating rollers 48 along the guide groove in the support frame 2 to approach the fixed roller 49 through its bracket. On the other hand, the rotating rod 42 hinged to the sliding plate 412 rotates around its fixed fulcrum. The rotating rod 42 pushes the support shaft 47 through the linkage structure composed of the sliding shaft 43, the linkage rod 44, the connecting plate 45 and the drive rod 46. This causes the support shaft 47 to drive the other rotating roller 48 to approach the fixed roller 49 along the guide groove in the support frame 2. This achieves the goal of driving the two rotating rollers 48 to press against the two fixed rollers 49 simultaneously with only one action of the cylinder 411, forming a triangular squeezing layout with the fixed roller 49. This applies uniform and adjustable pressure to the material and solves the problem of poor adaptability to materials of different thicknesses. Throughout the movement of the sliding plate 412, the cleaning pad 71 fixed to the bottom of the sliding plate 412 remains in contact with the upper surface of the support base 1 and wipes the support base 1 with the reciprocating motion of the sliding plate 412. Liquid and impurities that drip onto the support base 1 during the squeezing process are immediately absorbed by the cleaning pad 71. The absorbent cotton 72 located inside the support base 1, under the elastic pressing force applied by the return spring 74 via the limiting shaft 73, always remains in close contact with the lower surface of the cleaning pad 71. The liquid absorbed by the cleaning pad 71 will permeate and be transferred to the absorbent cotton 72 for storage, solving the problem of liquid accumulation and contamination. When the squeezing operation is completed, the cylinder 411 retracts, driving the sliding plate 412 to move in the opposite direction, and the two rotating rollers 48 are reset through the linkage structure. At the same time, the cleaning pad 71 wipes the support base 1 again.

Claims

1. A squeezing roller squeezing mechanism, comprising: Support base (1), and support frame (2) fixedly connected to the support base (1); Support block (5), which is fixedly connected to the support base (1); A drive motor (6) is fixedly installed on the support block (5), and the output end of the drive motor (6) is connected to a fixed roller (49). Its features are, Also includes: Adjustment mechanism (4) includes a fixed block (3), a drive assembly (41), a rotating rod (42), a sliding shaft (43), a linkage rod (44), a connecting plate (45), a drive rod (46), a support shaft (47), and two rotating rollers (48). The fixed block (3) is fixedly connected to the support base (1). The driving assembly (41) includes a cylinder (411) and a sliding plate (412). The cylinder (411) is fixedly installed on the fixed block (3). The sliding plate (412) is slidably fitted to the support base (1), and the output end of the cylinder (411) is connected to the sliding plate (412) in a transmission connection. One of the rotating rollers (48) is driven and connected on the moving path of the sliding plate (412). The rotating roller (48) is slidably fitted inside the support frame (2). The sliding plate (412) is hinged to the rotating rod (42). One end of the rotating rod (42) is rotatably connected to the support base (1) or the support frame (2) as a fixed fulcrum. The other end of the rotating rod (42) is rotatably connected to one end of the linkage rod (44) through the sliding shaft (43). The other end of the linkage rod (44) is fixedly or rotatably connected to the drive rod (46) through the connecting plate (45). The end of the drive rod (46) away from the connecting plate (45) is fixedly connected to the support shaft (47). The support shaft (47) is slidably fitted in the support frame (2) and connected to another rotating roller (48). The extension and retraction of the cylinder (411) drives the sliding plate (412) to move, and then through the linkage of the rotating rod (42), the linkage rod (44) and the driving rod (46), the two rotating rollers (48) are driven to move and press simultaneously toward the fixed roller (49).

2. The squeezing roller squeezing mechanism according to claim 1, characterized in that, It also includes a cleaning mechanism (7), which includes a cleaning pad (71) that is fixedly connected to the bottom of the sliding plate (412) and the bottom surface of the cleaning pad (71) abuts against the surface of the support base (1). It also includes absorbent cotton (72), limiting shaft (73) and return spring (74). The support base (1) has an internal cavity. The absorbent cotton (72) is movably installed in the cavity. The absorbent cotton (72) is located below the cleaning pad (71) and is in close contact with the cleaning pad (71).

3. The squeezing roller squeezing mechanism according to claim 2, characterized in that, The limiting shaft (73) is vertically fixed inside the support base (1), and the limiting shaft (73) passes through the body of the absorbent cotton (72). The return spring (74) is sleeved on the outer periphery of the limiting shaft (73), and the two ends of the return spring (74) abut against the inner wall of the support base (1) and the bottom surface of the absorbent cotton (72), respectively. The return spring (74) is in a compressed state to provide an elastic pressing force that pushes the absorbent cotton (72) against the cleaning pad (71).

4. The squeezing roller squeezing mechanism according to claim 1, characterized in that, The rotating rod (42) is a lever structure. The connection between the sliding plate (412) and the rotating rod (42) is provided with a waist-shaped hole or a groove to effectively adapt to the arc-shaped trajectory generated by the connection point when the rotating rod (42) rotates. When the rotating rod (42) is subjected to force and rotates, it applies a traction force to the linkage rod (44) through the sliding shaft (43).

5. The squeezing roller squeezing mechanism according to claim 1, characterized in that, The support frame (2) includes two vertically arranged side plates. The side plates are provided with guide grooves for the movement of the roller (48) and the support shaft (47). One of the rollers (48) is rotatably mounted on the bracket extending from the sliding plate (412) at both ends, and the other roller (48) is rotatably mounted on the support shaft (47) at both ends.

6. The squeezing roller squeezing mechanism according to claim 1, characterized in that, The drive rod (46) has an L-shaped or bent structure. The connecting plate (45) is located between the linkage rod (44) and the drive rod (46) and plays the role of angle conversion or extension connection, so as to convert the tension of the linkage rod (44) into the thrust of the drive rod (46) to push the support shaft (47) to slide.

7. The squeezing roller squeezing mechanism according to claim 1, characterized in that, The fixed roller (49) and the two rotating rollers (48) are arranged in a triangular or triangular shape. When the cylinder (411) drives the sliding plate (412) to reset, it drives the two rotating rollers (48) to move away from the fixed roller (49) to release the material.

8. The squeezing roller squeezing mechanism according to claim 3, characterized in that, The absorbent cotton (72) is made of highly absorbent sponge or porous fiber material and is used to absorb moisture and impurities transferred by the cleaning pad (71). The limiting shaft (73) is used to limit the displacement range of the absorbent cotton (72) in the vertical direction and prevent the absorbent cotton (72) from leaving the preset position.