Compressed and thrust-forced shrinkage pressure plate and cutting and grinding equipment

Abstract

This utility model discloses a pressure-reverse thrust shrinking plate and a cutting and grinding device, relating to the fields of grinding wheels, cutting machine pressure plates, etc. It includes an annular upper cover plate and a lower cover plate. The top of the lower cover plate has a snap-fit ​​groove adapted to the outer diameter of the upper cover plate. A sleeve coaxially arranged with the lower cover plate is fixed in the snap-fit ​​groove. The upper cover plate is fitted onto the sleeve and can rotate relative to it. Multiple sets of lower placement grooves are evenly arranged circumferentially within the snap-fit ​​groove, and corresponding upper placement grooves are arranged on the upper cover plate. The upper and lower placement grooves have the same structure and are centrally symmetrical, each including a placement part, a ramp part, and a blocking part. Rolling parts are placed between the upper and lower placement grooves and arranged in a circumferential array. A dustproof sealing ring can be provided on the outer edge between the upper and lower cover plates. When the cutting and grinding device of this application is working, the rolling parts are guided by the ramp part to generate a reverse thrust, achieving self-locking clamping. During disassembly, the rolling parts fall back to the placement part, and the cutting blade can be smoothly released, avoiding seizing. It has the advantages of reliable clamping, convenient disassembly, labor saving, dustproof durability, and strong adaptability.

Description

Technical Field

[0001] This utility model belongs to the fields of grinding machines, cutting machine pressure plates, etc., and particularly relates to a pressure plate that is subjected to pressure and reverse thrust and a cutting and grinding device. Background Technology

[0002] Grinding and polishing equipment such as grinding machines and disc mills are handheld power tools commonly used for cutting, grinding, and brushing metals and stones. Their cutting discs are typically secured by upper and lower pressure plates and a rotating shaft. In actual use, under prolonged load and clamping force, the cutting disc is prone to "seizing up"—that is, the relative rotation between the pressure plate and the cutting disc / shaft is obstructed, making disassembly difficult and affecting efficiency and safety. Therefore, how to provide a clamping device for cutting and polishing equipment that ensures reliable clamping while effectively reducing friction and the risk of seizing up between pressure plates remains a technical problem to be solved in this field. Utility Model Content

[0003] This utility model aims to address the shortcomings of existing technologies. It provides a device that can solve the problem of inconvenient disassembly and replacement of cutting discs in existing cutting and grinding equipment due to seizing during use.

[0004] On one hand, this utility model provides a pressure-reverse force contraction plate, which includes: an annular upper cover plate and an annular lower cover plate, comprising:

[0005] The top of the lower cover plate is provided with a snap-fit ​​groove that matches the outer diameter of the upper cover plate, and a sleeve coaxially arranged with the lower cover plate is fixed in the snap-fit ​​groove.

[0006] The upper cover plate is sleeved on the sleeve, and the outer edge of the upper cover plate is provided with an annular protrusion structure;

[0007] Multiple sets of lower placement slots are evenly spaced along the circumference inside the snap-fit ​​groove; the upper cover plate is provided with upper placement slots that correspond one-to-one with the lower placement slots.

[0008] The upper placement groove and the lower placement groove are symmetrically arranged and have the same structure. They both include: a placement part for supporting the rolling element, a ramp part located on one side of the placement part and with a sloping bottom surface, and a blocking part for limiting the rolling element.

[0009] The rolling elements are placed between the upper and lower placement slots and distributed in a circumferential array.

[0010] By setting symmetrical placement grooves between the upper and lower cover plates and using them in conjunction with rolling elements, the rolling elements generate a counter-pushing force under the action of the ramp and the blocking part, thereby achieving self-locking clamping of the cutting blade. This not only ensures the stability of the cutting blade during operation, but also allows for smooth release during disassembly, avoiding seizing and greatly improving ease of use and safety.

[0011] In one optional embodiment, a retaining ring is provided between the upper cover plate and the lower cover plate. The retaining ring is sleeved on the outside of the sleeve and axially limits the upper cover plate. The retaining ring can play a positioning role and provide a counter-thrust force; it can ensure that the upper cover plate and the lower cover plate maintain a certain distance, so that the ball is held in the blocking part, which facilitates the upper cover plate to fall back to the lower cover plate during disassembly, and can also provide a counter-thrust force to assist the rolling parts to fall back, thereby enhancing the structural reliability and ease of assembly and disassembly.

[0012] In one optional embodiment, the method includes: a retaining spring with at least two protrusions, one above the other; a lower cover plate with a lower locking hole corresponding to the protrusions of the retaining spring, and an upper cover plate with an upper locking hole corresponding to the protrusions of the retaining spring, so that the protrusions of the retaining spring can be respectively engaged in the upper locking hole and the lower locking hole for positioning. The retaining spring having protrusions and engaging with the upper and lower locking holes for positioning ensures that the relative position of the upper cover plate and the lower cover plate is accurate and stable after assembly, preventing the rolling elements from dislodging due to rotational offset or vibration, thereby ensuring the long-term stable operation and durability of the pressure plate.

[0013] In one optional embodiment, a dustproof sealing ring is further included. The dustproof sealing ring, together with the annular protrusion structure of the upper cover plate and the lower cover plate, forms a closed covering structure for the rolling element area. The dustproof sealing ring is fixed by press-fitting the annular protrusion structure on the outer edge of the upper cover plate with the lower cover plate. This method can effectively prevent dust from entering the rolling element area, avoid dust accumulation leading to jamming or wear, significantly extend the life of the device, and maintain long-term smooth operation.

[0014] In one optional embodiment, the top of the upper cover plate is provided with a gasket groove, and a gasket is detachably disposed in the gasket groove.

[0015] In one optional embodiment, the lower cover plate is provided with a fixing part for assembly with the rotating shaft of the cutting and grinding equipment. The fixing part has a centrally located through hole and a groove design for fixing to the rotating shaft. The fixing part can also be any of the following: internal thread, external thread, key connection, or spline connection. This greatly improves the adaptability and versatility of the pressure plate, facilitating its widespread application.

[0016] In one optional embodiment, the upper cover plate has an anti-slip structure on its outer surface, wherein the anti-slip structure is any one or a combination of anti-slip stripes, knurling, or an elastic anti-slip layer. The elastic anti-slip layer is made of rubber or a thermoplastic elastomer material with a Shore A hardness of 40-80. Providing an anti-slip structure or an elastic anti-slip layer on the outer surface of the upper cover plate effectively increases the grip friction during installation and disassembly, preventing slippage and improving ease of operation and safety. The elastic anti-slip layer also enhances comfort and wear resistance.

[0017] In one optional embodiment, the ramp portion has an angle of 2° to 45° relative to the end faces of the upper and lower cover plates. This allows the rolling element to move smoothly while generating sufficient counter-thrust, thereby achieving a balance between self-locking clamping and durability, and avoiding problems such as insufficient clamping force or excessive wear.

[0018] In one alternative embodiment, the rolling element includes, but is not limited to, balls or rollers.

[0019] In one optional embodiment, the rolling elements are evenly distributed circumferentially, and the number is six or more.

[0020] In one alternative embodiment, the height of the blocking portion is less than the diameter of the ball or the outer diameter of the roller, so as to restrict the ball or roller from passing over the upper end of the ramp and keep it working in the corresponding placement groove.

[0021] On the other hand, this utility model provides a cutting and grinding device, including a rotating shaft of the cutting and grinding device, a grinding blade, and a pressure-reverse force shrinking plate as described in any of the above. The fixed part of the pressure-reverse force shrinking plate is assembled with the rotating shaft. The pressure-reverse force shrinking plate is used to press the grinding blade and generate a reverse thrust and self-locking clamping force through the cooperation of the rolling element and the ramp under the action of external axial pressure.

[0022] This utility model provides a pressure-reverse force contraction plate, including an annular upper cover plate and an annular lower cover plate. The lower cover plate is provided with a fixing part for assembly with the rotating shaft of a cutting and grinding equipment. The top of the lower cover plate has a snap-fit ​​groove that matches the outer diameter of the upper cover plate. The protrusion at the edge of the snap-fit ​​groove on the lower cover plate can play a dustproof role. A sleeve arranged coaxially with the lower cover plate is fixed in the snap-fit ​​groove. The upper cover plate is sleeved on the sleeve and can rotate within the snap-fit ​​groove. The lower cover plate has several evenly spaced lower placement slots within its snap-fit ​​groove. Each lower placement slot contains a ball or roller, which corresponds to a specific slot. These lower placement slots are arranged in an array around the center line of the lower cover plate. The upper cover plate has upper placement slots that correspond to the lower cover plate. The upper and lower placement slots have the same structure and are symmetrically arranged. Both slots include a placement portion for holding the ball or roller. The right side of this placement portion has a sloped bottom, and the upper end of the sloped portion has a blocking portion for preventing the ball or roller from moving. In use, the lower cover plate is... The plate is fitted onto the rotating shaft of the cutting and grinding equipment, and then the cutting disc is fitted onto the rotating shaft. The upper pressure plate (which acts as a fixing nut) is then threaded onto the rotating shaft. When the cutting and grinding equipment is started, the upper cover plate rotates relative to the lower cover plate. Under the action of the retaining spring, the balls are pushed to the blocking part. The upper cover plate is pressed against the cutting disc by the reverse pushing action of the balls. The cutting disc is also fixed more and more firmly under the pressing action of the upper cover plate. When it is necessary to replace the cutting disc, the cutting disc is rotated in the opposite direction. Under the action of friction, the upper cover plate rotates in the opposite direction, and the balls move into the placement part. The upper pressure plate is then removed, and the cutting disc can be taken out.

[0023] The upper and lower placement slots of this invention are designed so that, during use, the ball bearings are positioned between the upper and lower placement slots. Under the action of the retaining spring, the ball bearings or rollers are held in the blocking position, creating a certain gap between the upper and lower cover plates. When the cutting blade needs to be removed, the cutting blade is rotated in the opposite direction, causing the ball bearings to fall back into the placement slot, and the upper cover plate disengages from the cutting blade, facilitating the removal of the cutting blade. The blocking position prevents the ball bearings from moving out. The retaining spring acts as a positioning element and provides a counter-pushing force, ensuring that the upper and lower cover plates maintain a certain distance, keeping the ball bearings in the blocking position. During removal, the upper cover plate easily falls back to the lower cover plate, facilitating disassembly. Attached Figure Description

[0024] This specification sets forth the complete and illustrative disclosure of this application, including its best practices, to those skilled in the art. Reference is made to the accompanying drawings, in which:

[0025] Figure 1 This is a three-dimensional structural diagram of a pressure-reverse thrust contraction plate according to an embodiment of the present invention;

[0026] Figure 2This is a schematic diagram of a three-dimensional assembly structure of a pressure-reverse force contraction plate according to an embodiment of the present invention. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of a three-dimensional assembly structure of a pressure-reverse force contraction plate according to an embodiment of the present invention. Figure 2 ;

[0028] Figure 4 This is a top view of a compression and thrust-reducing pressure plate according to an embodiment of the present invention.

[0029] Figure 5 This is a cross-sectional structural diagram of a pressure-reverse force contraction plate according to an embodiment of the present invention;

[0030] Figure 6 This is a three-dimensional assembly diagram of a pressure-reverse force contraction plate according to an embodiment of the present invention.

[0031] Figure 7 This is a top view of the lower cover plate of a pressure-reacting and retracting pressure plate according to an embodiment of the present invention.

[0032] Figure 8 A bottom view of the upper cover plate of a pressure-reverse force contraction plate according to an embodiment of the present utility model;

[0033] Figure 9 This is a schematic diagram of the anti-slip stripes on the upper cover of a pressure-reverse force contraction plate according to an embodiment of the present invention.

[0034] Figure label:

[0035] 1. Lower cover plate; 2. Upper cover plate; 3. Ball bearing; 4. Snap ring; 5. Dustproof sealing ring; 11. Snap-fit ​​groove; 12. Sleeve; 13. Lower placement groove; 14. Lower snap hole; 15. Fixing part; 20. Upper placement groove; 21. Placement part; 22. Sloping part; 23. Blocking part; 24. Washer ring groove; 25. Washer ring; 26. Upper snap hole; 27. Anti-slip stripe; 28. Annular raised structure; 41. Protrusion. Detailed Implementation

[0036] The embodiments of this application will now be described in detail with reference to the figures, including one or more examples of the embodiments of this application. Each example is provided for the purpose of explaining this application and not for limiting it. In fact, those skilled in the art will understand that various modifications and variations can be made to this application without departing from the scope or spirit of this application. For example, a feature illustrated or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. As used in this specification, the terms “first,” “second,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of the components. As used in this specification, unless the context clearly indicates otherwise, the terms “a,” “an,” “the,” and “the” are intended to indicate the presence of one or more elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be other elements in addition to those listed.

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Figure 1 This is a three-dimensional structural diagram of a pressure-reverse thrust contraction plate according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a three-dimensional assembly structure of a pressure-reverse force contraction plate according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of a three-dimensional assembly structure of a pressure-reverse force contraction plate according to an embodiment of the present invention. Figure 2 ; Figure 4 This is a top view of a compression and thrust-reducing pressure plate according to an embodiment of the present invention. Figure 5 This is a cross-sectional structural diagram of a pressure-reverse force contraction plate according to an embodiment of the present invention; Figure 6 This is a three-dimensional assembly diagram of a pressure-reverse force contraction plate according to an embodiment of the present invention. Figure 7 This is a top view of the lower cover plate of a pressure-reacting and retracting pressure plate according to an embodiment of the present invention. Figure 9 A bottom view of the upper cover plate of a pressure-reverse force contraction plate according to an embodiment of the present utility model; Figure 8 This is a schematic diagram of the anti-slip stripes on the upper cover of a pressure-reverse force contraction plate according to an embodiment of this utility model. Figures 1-9As shown, this utility model provides a pressure-reverse force contraction plate, including a ring-shaped lower cover plate 1 and a ring-shaped upper cover plate 2.

[0039] The top of the lower cover plate 1 is provided with a snap-fit ​​groove 11 that matches the outer diameter of the upper cover plate 2. The edge of the snap-fit ​​groove 11 is provided with an annular protrusion 28, which works in conjunction with the dustproof ring 6 to prevent dust. A sleeve 12 coaxially arranged with the lower cover plate 1 is fixed in the snap-fit ​​groove 11. The upper cover plate 2 is fitted on the sleeve 12 and can rotate within the snap-fit ​​groove 11.

[0040] The sleeve 12 is an integrally formed cylindrical structure, with its axis coaxial with the central axis of the lower cover plate 1. The sleeve 12 is fixedly installed in the snap-fit ​​groove 11 of the lower cover plate 1, serving as a guide and support component for the upper cover plate 2. Structurally, the outer wall of the sleeve 12 cooperates with a retaining spring 4, which is sleeved on the outside of the sleeve 12 to axially limit the upper cover plate 2 and provide a counter-thrust. The inner hole of the sleeve 12 is a through-hole structure, allowing the rotating shaft of the cutting and grinding equipment to pass through, ensuring coaxiality and stability during assembly with the shaft. Preferably, the outer diameter of the sleeve 12 is slightly smaller than the inner diameter of the upper cover plate 2, allowing the upper cover plate 2 to be smoothly fitted and rotated on it. The height of the sleeve 12 is matched to the thickness of the upper cover plate 2 to ensure that the upper cover plate 2 can rotate relative to the upper cover plate within the snap-fit ​​groove 11 while maintaining axial limitation. The upper outer wall of the sleeve 12 forms a stepped transition from bottom to top, with the inner part larger than the outer part, and a shoulder at the top. The shoulder can abut against the inner diameter edge of the washer 25, so that the washer 25 is stably positioned in the washer groove 24 of the upper cover plate 2.

[0041] A plurality of lower placement grooves 13 are evenly spaced circumferentially within the snap-fit ​​groove 11 of the lower cover plate 1. Each lower placement groove 13 contains a corresponding rolling element 3 (such as a ball bearing or roller). The upper cover plate 2 has upper placement grooves 20 that correspond one-to-one with the lower placement grooves 13. The upper placement grooves 20 and lower placement grooves 13 have the same structure and are centrally symmetrically arranged. Each set of upper placement grooves 20 and lower placement grooves 13 includes a placement portion 21 for supporting the rolling element, a ramp portion 22 located on one side of the placement portion 21 with a sloping bottom surface, and a blocking portion 23 located at the high end of the ramp portion 22. The rolling elements 3 are placed between the upper and lower placement grooves and distributed in a circumferential array.

[0042] To achieve stable positioning between the upper cover plate 2 and the lower cover plate 1, a retaining spring 4 is provided between them. The retaining spring 4 is sleeved on the outside of the sleeve 12 and can provide axial limiting and counter-thrust for the upper cover plate 2. The retaining spring 4 has at least two retaining spring protrusions 41, one above the other. The lower cover plate 1 has a lower retaining hole 14 corresponding to the retaining spring protrusions 41, and the upper cover plate 2 has an upper retaining hole 26 corresponding to the retaining spring protrusions 41. The positioning of the upper cover plate 2 and the lower cover plate 1 is achieved through the cooperation of the retaining spring protrusions 41 and the upper and lower retaining holes.

[0043] Specifically, both the lower locking hole 14 and the upper locking hole 26 are concave holes that are adapted to the protrusion 41. In practice, the lower locking hole 14 does not penetrate the lower cover plate 1, and the upper locking hole 26 does not penetrate the cover plate 2, so as to prevent dust from entering.

[0044] like Figure 2 , Figure 3 As shown, a washer groove 24 is provided at the top of the upper cover plate 2, and a washer 25 is detachably disposed in the groove to further enhance the stability and wear resistance of the upper cover plate 2. Preferably, as shown... Figure 8 As shown, the top outer surface of the upper cover plate 2 is provided with anti-slip stripes 27. The anti-slip stripes can effectively improve the friction during manual operation and prevent slipping.

[0045] The lower cover plate 1 is provided with a fixing part 15 that cooperates with the rotating shaft of the cutting and grinding equipment. The fixing part can be any one of internal thread, external thread, key connection or spline connection to achieve reliable assembly with the rotating shaft of the cutting and grinding equipment.

[0046] In one embodiment, this application also provides a cutting and grinding device, including a rotating shaft, grinding discs, and a pressure-reverse force shrinking plate as described above. The fixing part of the pressure-reverse force shrinking plate is assembled with the rotating shaft. The pressure-reverse force shrinking plate is used to press the grinding discs and, under external axial pressure, generates a reverse thrust and self-locking clamping force through the cooperation of the rolling element and the inclined part. Those skilled in the art will understand that the cutting and grinding device can be a grinding wheel machine, a cutting machine, an angle grinder, a polishing machine, etc., and the grinding discs can be cutting discs, grinding discs, polishing discs, etc.

[0047] In practical use, first, the lower cover plate 1 is fitted onto the rotating shaft of the cutting and grinding equipment, then the cutting disc is installed on the shaft, and the upper pressure plate is screwed onto the shaft using threads. After the cutting and grinding equipment is started, the upper cover plate 2 rotates relative to the lower cover plate 1. Under the action of the retaining spring 4, the rolling element 3 is forced to push against the ramp 22 and abut against the blocking part 23, thereby causing the upper cover plate 2 to move axially along the rotating shaft of the cutting and grinding equipment and press the cutting disc. Under the combined action of the ramp 22 of the upper cover plate 2 and the lower cover plate 1, the rolling element 3 is clamped, and the cutting disc is firmly pressed. When it is necessary to replace the cutting disc, simply rotate the cutting disc in the opposite direction. Under the action of friction between the cutting disc and the upper cover plate 2, the upper cover plate 2 rotates in the opposite direction, and the rolling element 3 falls back into the placement part 21 under the action of the counter-thrust. Then, the upper pressure plate 2 can be removed, and the cutting disc can be taken out. The operation is simple.

[0048] This embodiment achieves self-locking clamping of the cutting disc during operation of the cutting and grinding equipment by setting a rolling element and a ramp structure between the upper and lower cover plates and utilizing the counter-thrust force generated by the snap ring. At the same time, it avoids the operational difficulties caused by the traditional pressure plate locking during disassembly, and has good practicality and promotion value.

[0049] This utility model relates to a pressure-reverse thrust shrinking pressure plate and a cutting and grinding device. By setting symmetrical placement grooves between the upper and lower cover plates and using them in conjunction with rolling elements, the rolling elements can generate a reverse thrust under the action of the ramp and blocking parts. This achieves self-locking clamping of the cutting blade during operation, avoiding the seizing phenomenon caused by excessive friction in traditional pressure plates, thus significantly improving the convenience of disassembly and replacement. The retaining spring on the outside of the sleeve and its limiting cooperation with the upper and lower retaining holes maintain a stable gap and precise positioning between the upper and lower cover plates, ensuring the normal operation of the rolling elements under stress and enhancing the reliability of the overall structure. The addition of a dustproof sealing ring effectively prevents dust from entering the rolling element area, reducing dust accumulation. Reduced wear and jamming, extending service life; the upper cover plate is equipped with a gasket groove and a gasket, which can distribute the load and improve durability; its outer surface anti-slip structure improves the grip friction during manual operation, preventing slippage and enhancing operational safety; the lower cover plate fixing part can adopt various methods such as internal and external threads, key connection or spline connection, which has strong compatibility with the shafts of different cutting and grinding equipment and good versatility; the slope angle is optimized between 2° and 45°, which allows the rolling parts to move smoothly and generate sufficient counter-thrust force to ensure stable clamping without excessive wear; the rolling parts use ball bearings or rollers, with more than 6, preferably 17, to ensure uniform force distribution and reliable clamping effect. In summary, this utility model not only effectively solves the problems of cutting discs easily getting stuck and difficult disassembly in the prior art, but also comprehensively improves clamping stability, dustproof durability, operational safety and structural adaptability, and has significant practical value and promotion significance.

[0050] The description of this utility model is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the utility model, and to enable those skilled in the art to understand the utility model and design various embodiments with various modifications suitable for a particular purpose.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressurized reverse thrust retraction press plate comprising an upper ring-shaped cover plate and a lower ring-shaped cover plate characterized in that, include: The top of the lower cover plate is provided with a snap-fit ​​groove that matches the outer diameter of the upper cover plate, and a sleeve coaxially arranged with the lower cover plate is fixed in the snap-fit ​​groove. The upper cover plate is sleeved on the sleeve, and the outer edge of the upper cover plate is provided with an annular protrusion structure; Multiple sets of lower placement slots are evenly spaced along the circumference inside the snap-fit ​​groove; The upper cover plate is provided with upper placement slots that correspond one-to-one with the lower placement slots; The upper placement groove and the lower placement groove are symmetrically arranged and have the same structure. They both include: a placement part for supporting the rolling element, a ramp part located on one side of the placement part and with a sloping bottom surface, and a blocking part for limiting the rolling element. The rolling elements are placed between the upper and lower placement slots and distributed in a circumferential array.

2. The pressurized reverse thrust retraction press plate of claim 1, wherein, include: A retaining ring is provided between the upper cover plate and the lower cover plate. The retaining ring is sleeved on the outside of the sleeve and axially limits the upper cover plate.

3. The pressurized reverse thrust retraction press plate of claim 2, wherein, include: The retaining ring has at least two protrusions, one on the top and one on the bottom; The lower cover plate is provided with a lower locking hole corresponding to the protrusion of the retaining spring, and the upper cover plate is provided with an upper locking hole corresponding to the protrusion of the retaining spring, so that the protrusion of the retaining spring can be locked into the upper locking hole and the lower locking hole respectively for positioning.

4. The pressurized reverse thrust retraction press plate of claim 1, wherein, It also includes a dustproof sealing ring, wherein the dustproof sealing ring, together with the annular protrusion structure of the upper cover plate and the lower cover plate, forms a covering and sealing structure for the rolling part area; and / or The dustproof sealing ring is fixed by pressing a ring-shaped protrusion structure on the outer edge of the upper cover plate with the lower cover plate.

5. The pressurized reverse thrust retraction press plate of claim 1, wherein, include: The top of the top cover plate has a gasket groove. A washer is detachably installed in the washer groove.

6. The pressurized reverse thrust retraction press plate of claim 1, wherein, include: The lower cover plate is provided with a fixing part for assembly with the rotating shaft of the cutting and grinding equipment. The fixing part has a through hole and a groove design structure in the center for fixing to the rotating shaft of the cutting and grinding equipment.

7. The pressurized reverse thrust retraction press plate of claim 1, wherein, include: The outer surface of the top cover plate is provided with an anti-slip structure, which is any one or a combination of anti-slip stripes, knurling, or elastic anti-slip layers.

8. The pressurized reverse thrust retraction press plate of claim 1, wherein, include: The angle between the slope and the end faces of the upper and lower cover plates is 2° to 45°.

9. The pressurized reverse thrust retraction press plate of claim 1, wherein, include: The rolling element includes, but is not limited to, balls or rollers; and / or The rolling elements are evenly distributed circumferentially, and there are more than 6 of them. and / or The height of the blocking part is less than the diameter of the ball or the outer diameter of the roller, so as to restrict the ball or roller from passing over the upper end of the ramp and keep it working in the corresponding placement groove.

10. A cutting and grinding apparatus characterized by, The device includes a rotating shaft of a cutting and grinding equipment, grinding blades, and a pressure-reverse thrust shrinking plate as described in any one of claims 1 to 9. The fixed part of the pressure-reverse thrust shrinking plate is assembled with the rotating shaft. The pressure-reverse thrust shrinking plate is used to press the grinding blades and generate reverse thrust and self-locking clamping through the cooperation of the rolling element and the ramp under the action of external axial pressure.

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