Trolley furnace gas supply device and using method thereof
By designing the cleaning and fixing mechanism of the slide chute and slider structure, the reduction of heat dissipation efficiency and aging of seals caused by dust accumulation and oil stain on the outer wall of the supply pump is solved, and efficient heat dissipation of the supply pump and stable operation of the equipment is achieved.
Patent Information
- Application Number
- CN202510383869.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-07-29
AI Technical Summary
The existing trolley furnace gas supply device cannot effectively clean the ash and oil stains that supply the outer wall of the pump, resulting in the formation of a heat insulation layer, reducing heat dissipation efficiency, increasing the pump body temperature, shortening the seal life and possibly causing leakage.
A gas supply device including a mounting frame, a moving mechanism and a cleaning fixing mechanism is designed to realize sliding scratches of the cleaning pad through the slide chute and slider structure to remove dust and oil stains from the outer wall of the supply pump.
It improves the heat dissipation efficiency of the supply pump, prevents excessive temperature, extends the life of the seal, reduces equipment failures and maintenance costs, and improves equipment operation stability.
Smart Images
Figure CN120384179A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of heat treatment, and specifically to a trolley furnace gas supply device and a method for using the same. Background Art
[0002] The trolley furnace gas supply device is a device used in industrial processes such as metallurgy and heat treatment, and is mainly used to supply the required fuel gas or combustion-supporting gas to a trolley furnace (i.e., a furnace body for heating, annealing, etc.). The main function of this device is to ensure that the gas can be continuously and stably supplied into the furnace to maintain the temperature and process requirements inside the furnace.
[0003] The existing trolley furnace gas supply device cannot clean the outer wall of the supply pump. The accumulation of ash or oil on the outer wall will form a heat-insulating layer, which will cause a series of negative impacts. During the operation of the supply pump, certain heat will be generated. In particular, the motor and the pump body itself will heat up due to factors such as gas compression and flow. Generally, the outer wall of the supply pump dissipates heat through heat exchange with the surrounding air or cooling medium. When there is ash or oil on the outer wall, these substances form a heat-insulating layer on the outer wall. The heat-insulating layer will prevent the conduction and dissipation of heat, resulting in the heat inside the pump body being unable to be effectively dissipated to the outside, thereby reducing the heat dissipation efficiency. The heat-insulating layer formed by the accumulation of ash or oil will cause the temperature of the outer wall to continue to rise. The sealing parts are exposed to a high-temperature environment for a long time, and the aging speed is accelerated, and the sealing effect gradually decreases, and there may even be problems such as leakage and failure.
[0004] Therefore, we propose a trolley furnace gas supply device and a method for using the same. Summary of the Invention
[0005] The purpose of the present invention is to provide a trolley furnace gas supply device and a method for using the same, so as to solve the above deficiencies in the prior art that the accumulation of ash and oil on the outer wall of the supply pump forms a heat-insulating layer, which will reduce the heat dissipation efficiency and cause the temperature inside the supply pump to rise.
[0006] To achieve the above purpose, the present invention provides the following technical solution: A trolley furnace gas supply device includes an installation frame. A gas supply pump is installed inside the installation frame. An air outlet is provided at the bottom end of the gas supply pump. A pressure regulator is provided on the outer wall of the gas supply pump. A gas flowmeter is also connected to the gas supply pump. A moving mechanism is installed on the installation frame. A cleaning and fixing mechanism is connected to the moving mechanism. The cleaning and fixing mechanism is sleeved on the outer wall of the gas supply pump. The moving mechanism is slidably connected to the installation frame. The moving mechanism drives the cleaning and fixing mechanism to scrape and clean the outer wall of the gas supply pump, and the moving mechanism drives the cleaning and fixing mechanism to fix the gas supply pump.
[0007] Preferably, the moving mechanism includes a first chute opened in the installation frame. A first slider is slidably connected inside the first chute. One side of the first slider passing through the first chute is connected with a moving rod, and a handle is arranged on the outer wall side of the moving rod. A connecting rod is arranged on the inner wall side of the moving rod, and one side of the connecting rod away from the moving rod is connected with the cleaning and fixing mechanism.
[0008] Preferably, a threaded rod is arranged on the side of the first slider away from the first chute, and a nut is arranged on the outer peripheral side of the threaded rod.
[0009] Preferably, two groups of first chutes are symmetrically opened, and the length of each group of first chutes is set to be equal to the length of the smooth area on the outer wall of the gas supply pump.
[0010] Preferably, the outer diameter of the nut is set to be larger than the width of the first chute, and a rubber soft pad is arranged on the end surface of the nut in contact with the outer wall of the installation frame.
[0011] Preferably, the cleaning and fixing mechanism includes two groups of mounting plates. One group of mounting plates is arranged on the outer wall of the connecting rod. Side ears are arranged on both sides of the mounting plate. The two groups of mounting plates are connected through fastening bolts passing through the side ears. A second chute is opened inside the mounting plate. A second slider is slidably connected inside the second chute. A cleaning pad is arranged on the side of the slider away from the second chute.
[0012] Preferably, an inner cavity is opened on the inner wall of the second chute. A return spring is arranged in the inner cavity. One side of the return spring away from the inner cavity is connected with a limiting plate.
[0013] Preferably, the cleaning pad is inserted into the second chute through the second slider, and the shape of the cleaning pad matches the outer wall of the gas supply pump.
[0014] Preferably, two groups of return springs are symmetrically arranged. One end of each group of return springs is connected with the inner wall of the inner cavity, and the other end of each group of return springs is connected with the outer wall of the limiting plate.
[0015] A using method of a gas supply device for a trolley furnace includes the following steps: S1. Fix the installation frame to a preset base on the side of the trolley furnace through bolts, ensure that the axis of the first chute is parallel to the outer wall of the gas supply pump. Wrap the outer wall of the gas supply pump by fitting the two groups of mounting plates through the side ears, and temporarily do not tighten the fastening bolts. Observe the gap between the arc surface of the mounting plate and the outer wall of the pump body to ensure that the fitting degree ≤ 0.5 mm. Rotate the nut counterclockwise to the end of the threaded rod to release the limit of the first slider in the first chute.
[0016] S2. Pull the moving rod along the direction of the first sliding groove by holding the handle, drive the mounting plate to slide axially along the gas supply pump through the connecting rod. During the sliding process, the second slider adaptively compensates for the radial offset in the second sliding groove. After reaching the target position, tighten the nut clockwise until the rubber soft pad presses tightly against the outer wall of the mounting frame. S3. Insert the cleaning pad into the inner cavity at the bottom of the second sliding groove through the second slider, and tighten the fastening bolt to generate a clamping force on the inner arc surface of the mounting plate. The second slider presses the limiting plate to compress the return spring, causing the limiting plate to retract into the inner cavity. S4. Keep the nut in an untightened state, release the limit of the moving rod, pull the handle back and forth along the first sliding groove, control the moving speed at 0.2 - 0.5 m / s, form a 30° scraping angle between the cleaning pad and the pump body surface, and the dirt is pushed towards the bottom dust collection groove along the spiral track. The return spring provides dynamic pressure compensation to ensure a constant contact pressure between the cleaning pad and the pump body surface, and achieve scraping and cleaning through axial sliding.
[0017] In the above technical solution, a trolley furnace gas supply device and its usage method provided by the present invention have the following beneficial effects: 1. Through the design of the cleaning and fixing mechanism, the outer wall of the gas supply pump can be cleaned, avoiding the accumulation of dust or oil stains on the outer wall. These dust and oil stains form a heat insulation layer on the outer wall, which will reduce the heat dissipation efficiency and cause the temperature inside the supply pump to rise. However, through the cleaning function of this device, these substances can be removed in time, which helps to maintain the good heat dissipation performance of the outer wall of the gas supply pump and ensure that the pump body can effectively dissipate heat.
[0018] 2. The gas supply pump generates heat during operation, especially the motor and the pump body itself will heat up due to factors such as gas compression and flow. The cleaning function of this device can effectively avoid the heat insulation layer formed by dust or oil stains on the outer wall, thereby preventing the heat from being effectively conducted and dissipated, improving the heat dissipation efficiency of the pump body, and ensuring that the equipment maintains an appropriate temperature during operation.
[0019] 3. By cleaning the outer wall and avoiding the formation of a heat insulation layer by dust and oil stains, it is possible to prevent the temperature of the outer wall of the pump from being too high, thereby reducing the aging speed of the internal seals of the equipment. The aging of the seals will lead to a decline in the sealing effect, which may cause problems such as leakage or failure. Therefore, regularly cleaning the outer wall helps to extend the service life of the supply pump and reduce the maintenance and replacement costs.
[0020] 4. Due to the design of the cleaning pad, the outer wall of the supply pump can be scraped and cleaned to keep the outer wall clean, thereby reducing the occurrence of failures caused by dust or oil stains on the outer wall. This cleaning mechanism can effectively prevent the equipment from malfunctioning due to overheating or seal aging, reducing the maintenance cost and the downtime of the equipment. Description of the Drawings
[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.
[0022] Figure 1 Schematic diagram of the three-dimensional structure state provided by the embodiment of the present invention; Figure 2 Schematic diagram of the three-dimensional structure state of the moving mechanism provided by the embodiment of the present invention; Figure 3 Schematic diagram of the internal three-dimensional structure of the moving mechanism provided by the embodiment of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the moving mechanism and the cleaning and fixing mechanism provided by the embodiment of the present invention; Figure 5 Provided by the embodiment of the present invention Figure 4 Schematic diagram of the exploded state of the structure in; Figure 6 Schematic diagram of the three-dimensional structure of the cleaning and fixing mechanism provided by the embodiment of the present invention.
[0023] Explanation of reference numerals: 1. Installation frame; 2. Gas supply pump; 3. Air outlet; 4. Pressure regulator; 5. Gas flowmeter; 6. Moving mechanism; 61. First chute; 62. First slider; 63. Moving rod; 64. Handle; 65. Connecting rod; 66. Threaded rod; 67. Nut; 7. Cleaning and fixing mechanism; 71. Installation plate; 72. Side ear; 73. Tightening bolt; 74. Second chute; 75. Second slider; 76. Cleaning pad; 77. Inner cavity; 78. Return spring; 79. Limiting plate. Detailed implementation manners
[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail in conjunction with the drawings.
[0025] Please refer to Figures 1-6, an embodiment of the present invention provides a technical solution: a trolley furnace gas supply device and its usage method, including an installation frame 1. Inside the installation frame 1, a gas supply pump 2 is installed. At the bottom end of the gas supply pump 2, there is an air outlet 3. On the outer wall of the gas supply pump 2, there is a pressure regulator 4. A gas flow meter 5 is also connected to the gas supply pump 2. On the installation frame 1, a moving mechanism 6 is installed. The moving mechanism 6 is connected to a cleaning and fixing mechanism 7. The cleaning and fixing mechanism 7 is sleeved on the outer wall of the gas supply pump 2. The moving mechanism 6 is slidably connected to the installation frame 1. The moving mechanism 6 drives the cleaning and fixing mechanism 7 to scrape and clean the outer wall of the gas supply pump 2, and the moving mechanism 6 drives the cleaning and fixing mechanism 7 to fix the gas supply pump 2.
[0026] The moving mechanism 6 includes a first chute 61 opened inside the installation frame 1. Inside the first chute 61, a first slider 62 is slidably connected. The first slider 62 is connected to a moving rod 63 through one side of the first chute 61. On the outer wall side of the moving rod 63, there is a handle 64; on the inner wall side of the moving rod 63, there is a connecting rod 65. The side of the connecting rod 65 away from the moving rod 63 is connected to the cleaning and fixing mechanism 7. On the side of the first slider 62 away from the first chute 61, there is a threaded rod 66. On the outer peripheral side of the threaded rod 66, there is a nut 67. Two groups of the first chutes 61 are symmetrically opened. The length of each group of the first chutes 61 is set to be equal to the length of the smooth area on the outer wall of the gas supply pump 2.
[0027] The cleaning and fixing mechanism 7 includes two groups of mounting plates 71. One group of the mounting plates 71 is arranged on the outer wall of the connecting rod 65. On both sides of the mounting plate 71, there are side ears 72. The two groups of the mounting plates 71 are connected through fastening bolts 73 passing through the side ears 72. Inside the mounting plate 71, a second chute 74 is opened. Inside the second chute 74, a second slider 75 is slidably connected. The side of the slider away from the second chute 74 is provided with a cleaning pad 76. Inside the inner wall of the second chute 74, there is a cavity 77. Inside the cavity 77, there is a return spring 78. The side of the return spring 78 away from the cavity 77 is connected to a limiting plate 79. The cleaning pad 76 is inserted into the second chute 74 through the second slider 75. The shape of the cleaning pad 76 matches the outer wall of the gas supply pump 2.
[0028] When it is necessary to normally clamp and fix the outer wall of the gas supply pump 2, the side ears 72 on the two groups of mounting plates 71 can be fitted together, and then fixed by tightening the fastening bolts 73, so that the inner walls of the two groups of mounting plates 71 clamp and fix the outer wall of the gas supply pump 2. When it is necessary to repair different positions of the gas supply pump 2 or need to make a spatial layout, the fastening bolts 73 can be left untightened first, so that the two groups of mounting plates 71 are sleeved outside the gas supply pump 2 to form a preliminary fixation. Then, the nut 67 can be rotated outward, so that the nut 67 rotates outward in cooperation with the threaded rod 66. The inner end of the nut 67 is separated from the outer wall of the mounting frame 1. At this time, the contact between the first slider 62 and the limit in the first chute 61 is released. Then, the handle 64 is pulled, so that the handle 64 drives the moving rod 63 to move. The two sides of the moving rod 63 slide in the first chute 61 through the first slider 62, so as to drive the two groups of mounting plates 71 to move on the gas supply pump 2 through the connecting rod 65. After adjusting to the appropriate position, the fastening bolts 73 can be tightened, so that the two groups of mounting plates 71 fix the outer wall of the gas supply pump 2, and then the nut 67 is tightened, so that the nut 67 limits and fixes the position of the moving rod 63; When it is necessary to clean the outer wall of the gas supply pump 2, the cleaning pad 76 is inserted into the bottom inner cavity position of the second chute 74 through the second slider 75, and the fastening bolts 73 are tightened, so that the inner arc surfaces of the two groups of mounting plates 71 generate a clamping force. The second slider 75 presses the limiting plate 79 to compress the return spring 78, so that the limiting plate 79 retracts into the inner cavity 77; The cleaning pads 76 are installed on the two groups of mounting plates 71 by this method. At this time, the two groups of mounting plates 71 with the cleaning pads 76 are fixed on the outer wall of the gas supply pump 2. At this time, the fastening bolts 73 are tightened to the preliminary fixation state, and the mounting plates 71 can slide on the outer wall of the gas supply pump 2. At this time, the limit on the moving rod 63 is released, and then the handle 64 is pulled to drive the mounting plates 71 to slide on the outer wall of the gas supply pump 2, so that the cleaning pad 76 scrapes and cleans the outer wall of the gas supply pump 2.
[0029] It should be noted that two groups of first chutes 61 are symmetrically arranged, and the length of each group of first chutes 61 is set to be equal to the length of the smooth area on the outer wall of the gas supply pump 2. This design is to ensure that the cleaning and fixing mechanism 7 can move evenly on the outer wall of the gas supply pump 2. The outer wall of the gas supply pump generally has a smooth area, so that the contact between the cleaning pad 76 and the gas supply pump can be more stable, ensuring the cleaning effect. Through the two groups of symmetrically arranged chutes, the mounting plate can move more smoothly during the movement, avoiding the unsatisfactory cleaning effect caused by uneven force; The outer diameter of the nut 67 is set to be larger than the width of the first chute 61, and a rubber soft pad is arranged on the end surface of the nut 67 in contact with the outer wall of the mounting frame 1. The purpose of this design is to increase the friction between the nut 67 and the outer wall of the mounting frame 1 and avoid damage caused by hard contact; It should be noted that the cleaning pad 76 is inserted into the second sliding groove 74 through the second sliding groove 74. The shape of the cleaning pad 76 matches the outer wall of the gas supply pump 2. The mounting plate 71 is designed to fit the arc surface of the outer wall of the gas supply pump 2 in order to adapt to the actual shape of the outer wall of the gas supply pump 2 and ensure that the fixing mechanism can closely adhere to its surface. The cleaning pad 76 has good adsorption and softness, and can effectively clean the stains on the outer wall of the gas supply pump 2, avoiding scratches on the surface caused by hard materials; Two groups of the return springs 78 are symmetrically arranged. One end of each group of the return springs 78 is connected to the inner wall of the inner cavity 77, and the other end of each group of the return springs 78 is connected to the outer wall of the limiting plate 79. Two groups of the return springs 78 are symmetrically arranged, which can ensure that the cleaning pad 76 can maintain uniform pressure and position during the working process. The function of the return spring 78 is to ensure that the cleaning pad can automatically return to its original position after completing the cleaning task, thereby improving the service life and reliability.
[0030] A method for using a gas supply device of a trolley furnace is as follows: S1. Fix the installation frame to the preset base on the side of the trolley furnace by bolts, ensure that the axis of the first sliding groove is parallel to the outer wall of the gas supply pump. Wrap the outer wall of the gas supply pump with two groups of mounting plates through the side ears, and temporarily do not tighten the fixing bolts. Observe the gap between the arc surface of the mounting plate and the outer wall of the pump body to ensure that the fitting degree ≤ 0.5 mm. Rotate the nut counterclockwise to the end of the threaded rod to release the limit of the first slider in the first sliding groove; S2. Hold the handle and pull the moving rod along the direction of the first sliding groove. Drive the mounting plate to slide axially along the gas supply pump through the connecting rod. During the sliding process, the second slider adaptively compensates for the radial offset in the second sliding groove. After reaching the target position, tighten the nut clockwise until the rubber soft pad is pressed against the outer wall of the installation frame; S3. Insert the cleaning pad into the bottom inner cavity position of the second sliding groove through the second slider, and tighten the fixing bolts to generate a clamping force on the inner arc surface of the mounting plate. The second slider presses the limiting plate to compress the return spring, so that the limiting plate retracts into the inner cavity; S4. Keep the nut in an untightened state, release the limit of the moving rod, pull the handle back and forth along the first sliding groove, control the moving speed at 0.2 - 0.5 m / s, form a 30° scraping angle between the cleaning pad and the pump body surface, and the dirt is pushed towards the bottom dust collecting groove along the spiral track. The return spring provides dynamic pressure compensation to ensure that the contact pressure between the cleaning pad and the pump body surface is constant, and achieve scraping and cleaning through axial sliding.
[0031] This method breaks through the limitation of the traditional step-by-step operation of fixing and cleaning, and realizes the integrated process of positioning - fixing - cleaning - maintenance through structural linkage. The actual measurement shows that the comprehensive time-consuming of equipment maintenance can be shortened from 2.5 hours of the traditional method to 0.8 hours, which is especially suitable for the intelligent heat treatment production line that needs to frequently adjust process parameters.
[0032] Only some exemplary embodiments of the present invention have been described above by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A trolley furnace gas supply device, characterized in that, It includes an installation frame (1), inside which a gas supply pump (2) is installed. At the bottom of the gas supply pump (2), there is an air outlet (3). On the outer wall of the gas supply pump (2), there is a pressure regulator (4). A gas flow meter (5) is also connected to the gas supply pump (2). A moving mechanism (6) is installed on the installation frame (1). A cleaning and fixing mechanism (7) is connected to the moving mechanism (6). The cleaning and fixing mechanism (7) is sleeved on the outer wall of the gas supply pump (2). The moving mechanism (6) is slidably connected to the installation frame (1). The moving mechanism (6) drives the cleaning and fixing mechanism (7) to scrape and clean the outer wall of the gas supply pump (2), and the moving mechanism (6) drives the cleaning and fixing mechanism (7) to fix the gas supply pump (2).
2. The gas supply device of a trolley furnace according to claim 1, characterized in that, The moving mechanism (6) includes a first chute (61) opened inside the installation frame (1). A first slider (62) is slidably connected inside the first chute (61). The first slider (62) is connected to a moving rod (63) through one side of the first chute (61). A handle (64) is arranged on the outer wall side of the moving rod (63); On the inner wall side of the moving rod (63), there is a connecting rod (65). The side of the connecting rod (65) away from the moving rod (63) is connected to the cleaning and fixing mechanism (7).
3. The gas supply device of a trolley furnace according to claim 2, characterized in that, On the side of the first slider (62) away from the first chute (61), there is a threaded rod (66). A nut (67) is arranged on the outer peripheral side of the threaded rod (66).
4. The gas supply device for a trolley furnace according to claim 2, characterized in that, Two groups of the first chutes (61) are symmetrically opened. The length of each group of the first chutes (61) is set to be equal to the length of the smooth area on the outer wall of the gas supply pump (2).
5. A trolley furnace gas supply device and its usage method according to claim 2, characterized in that, The outer diameter of the nut (67) is set to be larger than the width of the first chute (61). The end face of the nut (67) in contact with the outer wall of the installation frame (1) is provided with a rubber soft pad.
6. The gas supply device of a trolley furnace according to claim 4, characterized in that, The cleaning and fixing mechanism (7) includes two groups of mounting plates (71). One group of the mounting plates (71) is arranged on the outer wall of the connecting rod (65). On both sides of the mounting plate (71), there are side ears (72). The two groups of the mounting plates (71) are connected through fastening bolts (73) passing through the side ears (72), Inside the mounting plate (71), a second chute (74) is opened. A second slider (75) is slidably connected inside the second chute (74). On the side of the slider away from the second chute (74), there is a cleaning pad (76).
7. The gas supply device of a trolley furnace according to claim 6, characterized in that, Inside the inner wall of the second chute (74), there is a cavity (77). A return spring (78) is arranged in the cavity (77). The side of the return spring (78) away from the cavity (77) is connected to a limiting plate (79).
8. A trolley furnace gas supply device according to claim 6, characterized in that, The cleaning pad (76) is inserted into the second chute (74) through the second slider (75). The shape of the cleaning pad (76) matches the outer wall of the gas supply pump (2).
9. The gas supply device for a trolley furnace according to claim 6, characterized in that, The reset springs (78) are symmetrically arranged in two groups. One end of each group of reset springs (78) is connected to the inner wall of the inner cavity (77), and the other end of each group of reset springs (78) is connected to the outer wall of the limiting plate (79).
10. A method for using a gas supply device of a trolley furnace according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Fix the installation frame (1) to the preset base on the side of the trolley furnace through bolts, ensure that the axis of the first chute (61) is parallel to the outer wall of the gas supply pump (2). Wrap the outer wall of the gas supply pump (2) with two groups of mounting plates (71) through the side ears (72), and do not tighten the fastening bolts (73) temporarily. Observe the gap between the arc surface of the mounting plate (71) and the outer wall of the pump body to ensure that the fitting degree ≤ 0.5 mm. Rotate the nut (67) counterclockwise to the end of the threaded rod (66) to release the limit of the first slider (62) in the first chute (61); S2. Hold the handle (64) and pull the moving rod (63) along the direction of the first chute (61), drive the mounting plate (71) to slide axially along the gas supply pump (2) through the connecting rod (65). During the sliding process, the second slider (75) adaptively compensates for the radial offset in the second chute (74). After reaching the target position, tighten the nut (67) clockwise until the rubber soft pad is pressed against the outer wall of the installation frame (1); S3. Insert the cleaning pad (76) into the bottom inner cavity position of the second chute (74) through the second slider (75), and tighten the fastening bolts (73) to generate a clamping force on the inner arc surface of the mounting plate (71). The second slider (75) presses the limiting plate (79) to compress the reset spring (78), so that the limiting plate (79) retracts into the inner cavity (77); S4. Keep the nut (67) in an untightened state, release the limit of the moving rod (63), reciprocally pull the handle (64) along the first chute (61), control the moving speed at 0.2 - 0.5 m / s, form a 30° scraping angle between the cleaning pad (76) and the pump body surface, and the dirt is pushed towards the bottom dust collection groove along the spiral track. The reset spring (78) provides dynamic pressure compensation to ensure that the contact pressure between the cleaning pad (76) and the pump body surface is constant, and scraping cleaning is achieved through axial sliding.