Shell rust removal device for fan production

Abstract

The invention provides a shell rust removal device for fan production, and belongs to the technical field of rust removal devices. Comprising a rack, a lower positioning roller is arranged on the rack, a first lifting table and a second lifting table are assembled on the outer side of the rack, and an upper positioning roller is assembled on the first lifting table through a first lifting frame. The bottom end of the second lifting frame is connected with a movable plate through a sleeve and a movable rod, the bottom end of the movable plate is fixedly connected with a servo motor, and a driving shaft of the servo motor is fixedly connected with a polishing wheel through a driving rod. According to the shell rust removal device for fan production, the monitoring assembly is arranged, so that the shell rust removal device for fan production can accurately monitor abrasion data generated in the polishing and rust removal process of the polishing wheel in real time, frequent shutdown judgment is not needed, and the polishing and rust removal efficiency of the whole device on a fan shell material is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of rust removal devices, and in particular to a casing rust removal device for fan production. Background Art

[0002] In the manufacturing process of fans, the fan casing is a key component, and its surface quality directly affects the corrosion resistance, service life and appearance performance of the fan. Since the fan casing is mostly made of metal materials, such as steel plates, aluminum alloys, etc., it is easily affected by environmental factors such as humidity and salt spray during processing, storage or transportation, causing rust. Therefore, in the process of fan production and processing, the rust removal and polishing process of the fan casing is essential.

[0003] At present, the rust removal and polishing technologies commonly used in the industry mainly include mechanical grinding, sandblasting, chemical pickling and laser rust removal. Among them, mechanical grinding is widely used due to its low equipment cost and simple operation. A typical mechanical rust removal device is usually composed of a rotating polishing wheel, a drive motor and a positioning mechanism. The rust layer is removed by the friction between the polishing wheel and the outer shell surface. However, this technology still has certain shortcomings in practical applications. The polishing wheel will cause its diameter to decrease or the surface roughness to change due to wear during continuous operation, and the existing equipment lacks online detection means for the wear status of the polishing wheel. Operators usually rely on experience or regular shutdown measurements to judge the degree of wear, which is not only inefficient, but also prone to incomplete rust removal or excessive polishing due to delayed judgment, affecting the product quality of the fan casing. Therefore, the present application provides a casing rust removal device for fan production to meet the needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rust removal device for fan casing production to solve the problem that the existing rust removal and polishing devices are inefficient and prone to incomplete rust removal or excessive polishing due to delayed judgment, thereby affecting the product quality of the fan casing.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A rust removal device for fan casing production includes a frame, a lower positioning roller is provided on the frame, and a first lifting platform and a second lifting platform are installed on the outside of the frame, an upper positioning roller is installed on the first lifting platform through the first lifting platform, and a second lifting platform is provided on the outside of the second lifting platform, the bottom end of the second lifting platform is connected to a movable plate through a sleeve and a movable rod, the bottom end of the movable plate is fixedly connected to a servo motor, and the driving shaft of the servo motor is fixedly connected to a polishing wheel through a driving rod; a monitoring component is used to monitor the wear degree of the polishing wheel, and the monitoring component is fixedly connected to the second lifting frame; a compensation component is used to adjust the displacement of the polishing wheel after wear, and the compensation component is fixedly connected to the second lifting frame.

[0006] Optionally, a drive motor associated with the lower positioning roller is fixedly connected to the outside of the frame, the upper positioning roller is located directly above the lower positioning roller, a slide rail is provided on the outside of the frame, and the second lifting platform is installed on the slide rail.

[0007] Optionally, the movable plate and the servo motor are fixedly connected via evenly distributed shock-filtering blocks, and a shock-filtering frame is fixedly connected to the outer side of the movable plate, and the shock-filtering frame and the driving rod are movably connected via a bearing.

[0008] Optionally, the end of the first lifting frame away from the upper positioning roller is movably mounted in the first lifting platform, the end of the second lifting frame away from the movable plate is movably mounted in the second lifting platform, and a limiting spring is fixedly connected between the second lifting frame and the movable plate.

[0009] Optionally, the top end of the sleeve is fixedly connected to the second lifting frame, the bottom end of the movable rod is fixedly connected to the top end of the movable plate, and the movable rod is movably sleeved in the sleeve.

[0010] Optionally, the monitoring includes an air pressure detector fixedly connected to the bottom end of the second lifting frame, the position of the air pressure detector corresponds to the sleeve one by one, and the detection end of the air pressure detector is located inside the sleeve.

[0011] Optionally, a movable cavity is opened in the sleeve, the top end of the movable rod is fixedly connected to a piston disk that matches the shape of the movable cavity, and the outer edge of the piston disk is fixedly connected to a sealing strip.

[0012] Optionally, the compensation component includes an air pump fixedly connected to the middle part of the bottom end of the second lifting frame, the air pump is connected to the sleeve through an air pipe, and the connection position between the air pipe and the piston disc is located below the piston disc.

[0013] Optionally, evenly distributed positioning columns are fixedly connected to the bottom end of the inner side wall of the sleeve, and the bottom of the piston disc is provided with positioning grooves that are adapted to the shape of the positioning columns.

[0014] Optionally, a guide bar is fixedly connected to the top end of the inner side wall of the sleeve, and a guide groove that matches the shape of the guide bar is formed in the piston disc and the movable rod.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a monitoring component, the fan production casing rust removal device can accurately monitor the wear data generated by the polishing wheel during the polishing and rust removal process in real time, without the need for frequent shutdowns for judgment, thereby ensuring the overall polishing and rust removal efficiency of the device for the fan casing material.

[0016] By setting up a second lifting platform, a second lifting frame limit spring and a compensation component, when the monitoring component detects that the wear degree of the polishing wheel can no longer meet the processing requirements of rust removal and polishing, the second lifting platform and the compensation component will cooperate to promptly drive the polishing wheel to move, so as to maintain the contact effect between the polishing wheel and the fan housing component, thereby ensuring the rust removal and polishing effect of the fan housing material.

[0017] By setting up an air pump and an air tube in the compensation component, the extrusion force between the polishing wheel and the fan casing material is adjusted in real time during the process of the second lifting platform driving the second lifting frame and the polishing wheel to produce displacement, thereby avoiding the polishing wheel from excessively squeezing the fan casing material during the adjustment process and causing excessive polishing, thereby further ensuring the processing quality of the device.

[0018] By setting up compensation components, shock-absorbing blocks and shock-absorbing frames, and relying on the materials of the shock-absorbing blocks and shock-absorbing frames, as well as the inflation adjustment method of the compensation components, the vibrations generated by the servo motor and polishing wheel during the processing process are filtered, making the data monitored by the monitoring components more stable and reliable, effectively reducing the interference of the working environment, and improving the technical solution of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0020] Figure 1 This is a first-person perspective schematic diagram of the three-dimensional structure of a casing rust removal device for fan production; Figure 2 This is a schematic diagram of the second-angle perspective of the three-dimensional structure of the casing rust removal device for fan production; Figure 3 This is a schematic diagram of the coordinated structure of the movable plate, servo motor and polishing wheel; Figure 4 This is a schematic diagram of the matching structure of the sleeve, air pump and air pressure detector; Figure 5 This is a schematic diagram of the matching structure of the sleeve, movable rod and piston disc; Figure 6 It is a schematic diagram of the three-dimensional structure of the movable rod and the piston disc; Figure 7 It is a partial cross-sectional structural diagram of the movable rod and the piston disc; Figure 8 It is a schematic diagram of the partial cross-sectional structure of the sleeve.

[0021] Reference numerals: 1. Frame; 2. Lower positioning roller; 3. Upper positioning roller; 4. First lifting platform; 5. Second lifting platform; 6. First lifting frame; 7. Second lifting frame; 8. Movable plate; 9. Servo motor; 10. Drive rod; 11. Polishing wheel; 12. Vibration filter block; 13. Vibration filter frame; 14. Sleeve; 15. Movable rod; 16. Limit spring; 17. Air pump; 18. Air pressure detector; 19. Air tube; 20. Piston disc; 21. Sealing strip; 22. Guide strip; 23. Positioning column; 24. Positioning groove; 25. Guide groove; 26. Movable cavity.

[0022] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0023] The following describes in detail a fan casing rust removal device for production, provided by the present invention, with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0024] It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0025] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0026] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0027] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0028] like Figures 1 to 8 As shown, the embodiment of the present invention provides a rust removal device for fan production, including a frame 1, a lower positioning roller 2 is provided on the frame 1, and a first lifting platform 4 and a second lifting platform 5 are installed on the outside of the frame 1, and an upper positioning roller 3 is installed on the first lifting platform 4 through a first lifting frame 6. The frame 1 is the foundation of the entire device and provides a fixed installation position for other structures in the device, thereby ensuring the stability of the structural working environment. The lower positioning roller 2 and the upper positioning roller 3 are used to clamp and limit the circular tubular fan casing material to be rust-removed and polished, and while clamping, keep the fan The rotatable ability of the shell material facilitates subsequent comprehensive polishing and rust removal. A second lifting frame 7 is provided on the outside of the second lifting platform 5. The bottom end of the second lifting frame 7 is connected to a movable plate 8 through a sleeve 14 and a movable rod 15. The bottom end of the movable plate 8 is fixedly connected to a servo motor 9. The driving shaft of the servo motor 9 is fixedly connected to a polishing wheel 11 through a driving rod 10. When the servo motor 9 is working, it can drive the polishing wheel 11 through its driving shaft. Then, through the rapid rotation of the polishing wheel 11 and the contact between the polishing wheel 11 and the fan shell material, the fan shell is polished and rust-removed. The monitoring component is used to monitor the degree of wear of the polishing wheel 11. The monitoring component is fixedly connected to the second lifting frame 7. During the rust removal process, the polishing wheel 11 is in close contact with the shell material. Once the polishing wheel 11 is worn, the movable plate 8 and the servo motor 9 can move accordingly through the relative displacement between the sleeve 14 and the movable rod 15, and the relative position between the second lifting frame 7 changes. The monitoring component can judge the degree of wear by monitoring the change of air pressure in the sleeve 14, and then adjust the device according to the degree of wear. This monitoring method has smaller errors and is less affected by the vibration of the servo motor 9 and the polishing wheel 11 during operation; the compensation component is used to adjust the displacement of the polishing wheel 11 after wear. The compensation component is fixedly connected to the second lifting frame 7. The compensation component and the monitoring component cooperate with each other and use air pressure control to adjust the relative positions of the servo motor 9, the drive rod 10 and the polishing wheel 11 in real time according to the monitoring data of the monitoring component. The adjustment control is more precise, which can effectively ensure the rust removal effect of the device without causing excessive polishing, thereby ensuring the product quality of the fan housing.

[0029] In this embodiment, if Figures 1 to 3The second lifting platform 5 is installed on the outer side of the frame 1 to drive the rotation of the lower positioning roller 2. When the fan casing material is rusted, the fan casing material is placed on the lower positioning roller 2. A gap is reserved between the lower positioning rollers 2 to keep the two lower positioning rollers 2 at the bottom sides of the fan casing material, respectively, to support the fan casing material. The lower positioning roller 2 is used to prevent the fan casing material from sliding off it. After that, the first lifting platform 4 works and is lifted and lowered by the first lifting frame 6 until the first lifting frame 6 drives the upper positioning roller 3 to cooperate with the lower positioning roller 2 to clamp the fan casing material. In the actual rust removal process, the second lifting platform 5 moves along the slide rail on the outside of the frame 1, and then drives the polishing wheel 11 to be moved toward the lower positioning roller 2 The fan casing material after being clamped by the upper positioning roller 3 is pushed forward to promote the polishing wheel 11 to contact with the fan casing material, and polish and remove rust at the contact position. Synchronously, the driving motor drives the lower positioning roller 2 to rotate, and then the fan casing material itself is also in a rotating state. The rotation direction is opposite to the rotation direction of the polishing wheel 11 when it is working, so that the polishing wheel 11 can fully contact various parts of the fan casing material to achieve comprehensive polishing and rust removal operations. The movable plate 8 and the servo motor 9 are fixedly connected by evenly distributed shock-filtering blocks 12, and a shock-filtering frame 13 is fixedly connected to the outside of the movable plate 8. The shock-filtering frame 13 and the driving rod 10 are movably connected by bearings. The shock-filtering blocks 12 and the shock-filtering frame 13 are both made of hard rubber, which can not only play a connecting and fixing effect, but also have good shock-filtering capabilities, which can further avoid the vibration generated during the operation of the servo motor 9 and the polishing wheel 11 from affecting the monitoring effect of the monitoring component.

[0030] In this embodiment, if Figures 3 to 5As shown, one end of the first lifting frame 6 away from the upper positioning roller 3 is movably sleeved in the first lifting platform 4, and one end of the second lifting frame 7 away from the movable plate 8 is movably sleeved in the second lifting platform 5. A limit spring 16 is fixedly connected between the second lifting frame 7 and the movable plate 8. During the polishing process of the polishing wheel 11, the limit spring 16 is in a compressed state, squeezing and limiting the position of the movable plate 8, the servo motor 9, the driving rod 10 and the polishing wheel 11. After the polishing wheel 11 is worn, the position of the polishing wheel 11 can be adjusted in time by its own elastic force. The top end of the sleeve 14 is fixedly connected to the second lifting frame 7, the bottom end of the movable rod 15 is fixedly connected to the top of the movable plate 8, and the movable rod 15 is movably sleeved in the sleeve. In the cylinder 14, the polishing wheel 11 rotates under the drive of the servo motor 9 and contacts the fan casing material. During the rust removal process, the polishing wheel 11 is in close contact with the casing material. Once the polishing wheel 11 is worn, the limit spring 16 can drive the movable plate 8 and the servo motor 9 toward the polishing position under the action of its own elastic force, and then maintain the close contact between the polishing wheel 11 and the fan casing material. The synchronized movable plate 8 and servo motor 9 can move accordingly through the relative displacement between the sleeve 14 and the movable rod 15, and the relative position between the second lifting frame 7 changes. At this time, the monitoring component can judge the degree of wear by monitoring the change of air pressure in the sleeve 14, and then make the compensation component in the device work.

[0031] In this embodiment, if Figures 3 to 6As shown, the monitoring includes an air pressure detector 18 fixedly connected to the bottom end of the second lifting frame 7, the position of the air pressure detector 18 corresponds one to one with the sleeve 14, and the detection end of the air pressure detector 18 is located inside the sleeve 14, and an active cavity 26 is opened in the sleeve 14, and the top of the movable rod 15 is fixedly connected to a piston disk 20 that is adapted to the shape of the active cavity 26, and the outer edge of the piston disk 20 is fixedly connected to a sealing strip 21. The arrangement of the piston disk 20 and the sealing strip 21 separates the active cavity 26 in the sleeve 14 into two areas and ensures the sealing performance between the two separated areas. The area above the piston disk 20 is the monitoring area, which is the area where the detection end of the air pressure detector 18 is located, and the area below the piston disk 20 is the inflation area, which is the inflation position when the compensation component performs inflation fine-tuning according to the data monitored by the monitoring component. The sealing strip 21 is made of elastic rubber, and the arrangement of the sealing strip 21 is used to fill the piston disk 20 and the sleeve 14 The gap between the inner walls ensures the separation of the movable cavity 26 and the sealing effect after separation. When the polishing wheel 11 just starts to carry out rust removal work, its position is limited by the elastic force of the limit spring 16. At this time, the air pressure in the sleeve 14 is monitored by the monitoring component as the initial data. When the monitoring component is working, it monitors the air pressure inside the sleeve 14 through the detection end of the air pressure detector 18. After the polishing wheel 11 is worn, the limit spring 16 relies on its own elastic force to compensate the polishing wheel 11 for the first time. In this process, a relative displacement will occur between the sleeve 14 and the movable rod 15, and the air pressure in the area of the sleeve 14 corresponding to the detection probe of the air pressure detector 18 will also change synchronously, thereby enabling the monitoring component to timely and accurately judge the relative displacement distance between the sleeve 14 and the movable rod 15, and indirectly judge the degree of wear of the polishing wheel 11, and then adjust the compensation component according to the degree of wear, thereby accurately controlling the compensation component to work.

[0032] In this embodiment, if Figures 3 to 8As shown, the compensation component includes an air pump 17 fixedly connected to the middle of the bottom end of the second lifting frame 7. The air pump 17 is connected to the sleeve 14 through an air pipe 19. The connection position between the air pipe 19 and the piston disc 20 is located below the piston disc 20. When the air pressure detector 18 detects the change of air pressure in the sleeve 14, the second lifting platform 5 works synchronously and drives the second lifting frame 7 and the movable plate 8 to produce relative displacement, and also causes the sleeve 14 and the movable rod 15 to produce relative displacement, so as to adjust the extrusion force between the polishing wheel 11 and the fan casing material. In this process, the air pump 17 inflates and deflates the area below the piston disc 20 in the sleeve 14 through the air pipe 19, so as to maintain the air pressure in the monitoring area of the sleeve 14 during the process of the second lifting platform 5 driving the second lifting frame 7 to rise and fall, that is, to continuously control the extrusion force between the polishing wheel 11 and the fan casing material, thereby avoiding the influence of excessive polishing and rust removal on the quality of the fan casing material, and ensuring the production and processing quality of the fan. The bottom end of the inner wall of the sleeve 14 is fixedly connected with a uniform The distributed positioning columns 23 are provided, and the bottom of the piston disc 20 is provided with a positioning groove 24 that matches the shape of the positioning columns 23. The top of the inner wall of the sleeve 14 is fixedly connected with a guide strip 22. The piston disc 20 and the movable rod 15 are provided with a guide groove 25 that matches the shape of the guide strip 22. The positioning column 23 is used to limit the movement of the piston disc 20 in the sleeve 14, facilitating the communication between the inflation tube 19 and the sleeve 14, and preventing the piston disc 20 from closing the communication between the inflation tube 19 and the sleeve 14, resulting in the compensation group The components cannot perform fine-tuning operations for inflation and deflation. When the piston disc 20 moves to the lowest point in the sleeve 14, the top of the positioning column 23 is embedded in the positioning groove 24 on the piston disc 20, positioning and blocking the piston disc 20. The cross-section of the guide bar 22 is cross-shaped, and its bottom end is flush with the end with an opening of the sleeve 14. It is sleeved inside the guide groove 25 in the movable rod 15 and the guide bar 22. When relative displacement occurs between the sleeve 14 and the movable rod 15, it provides guidance and limitation to ensure the stability of the sleeve 14 and the movable rod 15 during displacement.

[0033] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A fan production housing rust removal device, comprising a frame, a lower positioning roller is provided on the frame, and a first lifting platform and a second lifting platform are installed on the outer side of the frame, and the first lifting platform is equipped with an upper positioning roller through the first lifting frame, characterized in that: A second lifting frame is provided on the outside of the second lifting platform, the bottom end of the second lifting frame is connected to a movable plate through a sleeve and a movable rod, the bottom end of the movable plate is fixedly connected to a servo motor, and the drive shaft of the servo motor is fixedly connected to a polishing wheel through a drive rod; A monitoring component, used for monitoring the wear degree of the polishing wheel, wherein the monitoring component is fixedly connected to the second lifting frame; The compensation component is used for adjusting the displacement of the polishing wheel after wear, and the compensation component is fixedly connected to the second lifting frame.

2. The fan production casing rust removal device according to claim 1, characterized in that: The outside of the frame is fixedly connected to a driving motor associated with the lower positioning roller. The upper positioning roller is located directly above the lower positioning roller. The outside of the frame is provided with a slide rail, and the second lifting platform is installed on the slide rail.

3. The rust removal device for fan casing according to claim 1, characterized in that: The movable plate and the servo motor are fixedly connected via evenly distributed vibration filtering blocks, and a vibration filtering frame is fixedly connected to the outer side of the movable plate. The vibration filtering frame and the driving rod are movably connected via a bearing.

4. The rust removal device for fan casing according to claim 1, characterized in that: One end of the first lifting frame away from the upper positioning roller is movably mounted in the first lifting platform, and one end of the second lifting frame away from the movable plate is movably mounted in the second lifting platform. A limiting spring is fixedly connected between the second lifting frame and the movable plate.

5. The rust removal device for fan casing according to claim 4, characterized in that: The top end of the sleeve is fixedly connected to the second lifting frame, the bottom end of the movable rod is fixedly connected to the top end of the movable plate, and the movable rod is movably sleeved in the sleeve.

6. The rust removal device for fan casing according to claim 5, characterized in that: The monitoring includes an air pressure detector fixedly connected to the bottom end of the second lifting frame. The position of the air pressure detector corresponds to the sleeve one by one, and the detection end of the air pressure detector is located inside the sleeve.

7. The rust removal device for fan casing according to claim 6, characterized in that: A movable cavity is provided in the sleeve, the top end of the movable rod is fixedly connected to a piston disc that matches the shape of the movable cavity, and the outer edge of the piston disc is fixedly connected to a sealing strip.

8. The rust removal device for fan casing according to claim 7, characterized in that: The compensation component includes an air pump fixedly connected to the middle part of the bottom end of the second lifting frame. The air pump is connected to the sleeve through an air pipe. The connection position between the air pipe and the piston disc is located below the piston disc.

9. The rust removal device for fan casing according to claim 8, characterized in that: The bottom end of the inner side wall of the sleeve is fixedly connected with evenly distributed positioning columns, and the bottom of the piston disc is provided with positioning grooves that are adapted to the shape of the positioning columns.

10. The rust removal device for fan casing according to claim 9, characterized in that: A guide strip is fixedly connected to the top end of the inner side wall of the sleeve, and a guide groove which is adapted to the shape of the guide strip is formed in the piston disc and the movable rod.

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