Disassembling and assembling tool for round nut on shaft

Abstract

The utility model provides a dismounting and mounting tool for a round nut on a shaft. The dismounting and mounting tool comprises an inner sleeve, an outer sleeve, an elastic piece and a clamping jaw. The outer sleeve is arranged on the periphery of the inner sleeve in a sleeving mode and can move along the central axis of the inner sleeve, and a dismounting and mounting driving structure is arranged at the upper end of the inner sleeve. The multiple clamping jaws are distributed around the central axis of the inner sleeve, the upper portions of the clamping jaws are provided with driving pieces located between the inner sleeve and the outer sleeve, and the elastic pieces are arranged between the driving pieces and the inner sleeve and are provided with pre-tightening force enabling the driving pieces to be away from the inner sleeve outwards. A first driving inclined plane is arranged on the inner side of the outer sleeve, a second driving inclined plane is arranged on the periphery of the clamping jaw, the first driving inclined plane is attached to the second driving inclined plane, and when the outer sleeve moves downwards, the clamping jaw is pushed to move towards the central axis of the inner sleeve. According to the dismounting and mounting tool for the round nut on the shaft, the round nut can be screwed, dismounted and mounted in a small working area, the overall universality of the dismounting and mounting tool for the round nut on the shaft is high, the use cost is increased, and the use convenience is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of nut disassembling and assembling tools, and particularly relates to a tool for disassembling and assembling round nuts on shafts. Background Art

[0002] Round nuts are used as axial fixing elements for bearings and are typically threaded onto shafts using round nut locking fixtures. Existing round nut locking fixtures are manufactured in different styles to meet the locking requirements of round nuts for different shaft diameters and different locking positions. For example, locking positions with large operating space can be tightened using special wrenches, while locking positions with limited operating space require special fixtures made from steel pipes.

[0003] It can be seen that the existing round nut locking tooling has great limitations in use. One tooling can only be used in one scenario. In addition, special tooling made of components such as steel pipes has the problems of being large in size, inconvenient to manage and store, and difficult to use. It may also be deformed during use, affecting its service life. Utility Model Content

[0004] The embodiment of the utility model provides a tool for disassembling and assembling round nuts on shafts, aiming to solve the problems in the prior art of large usage limitations and inconvenience in use of round nut locking tools.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Provided is a tool for disassembling and assembling round nuts on a shaft, comprising:

[0007] An inner sleeve, an outer sleeve, a plurality of elastic members and a plurality of claws;

[0008] The outer sleeve is sleeved on the outer circumference of the inner sleeve and can move along the central axis of the inner sleeve. The upper end of the inner sleeve is provided with a disassembly and assembly driving structure;

[0009] The plurality of claws are distributed around the central axis of the inner sleeve, and a driving member located between the inner sleeve and the outer sleeve is provided on the upper portion of the claws. The elastic member is provided between the driving member and the inner sleeve and is configured with a pre-tightening force to force the driving member outward away from the inner sleeve.

[0010] A first driving bevel is provided on the inner side of the outer sleeve, and a second driving bevel is provided on the outer periphery of the clamping claw. The first driving bevel fits with the second driving bevel and can push the clamping claw to move toward the central axis of the inner sleeve when the outer sleeve moves downward.

[0011] In a possible implementation, the inner side of the driving member is provided with a first accommodating groove, the outer side of the inner sleeve is provided with a second accommodating groove corresponding to the first accommodating groove, and the two ends of the elastic member are accommodated in the first accommodating groove and the second accommodating groove respectively.

[0012] In some embodiments, the shaft round nut dismounting tool further comprises a guide pin, the closed end of the first accommodating groove is provided with a first guide groove, the closed end of the second accommodating groove is provided with a second guide groove corresponding to the first guide groove, the two ends of the guide pin are respectively inserted into the first guide groove and the second guide groove, and the elastic member is sleeved on the outer periphery of the guide pin.

[0013] In a possible implementation, the inner side of the outer sleeve is provided with a reset guide groove above the first driving slope, the driving member is arranged in the reset guide groove, the upper side wall of the reset guide groove is a first guide slope, the first guide slope is parallel to the first driving slope, and the first guide slope is in contact with the outer peripheral surface of the driving member when the claw moves inwards and outwards.

[0014] In some embodiments, the lower surface of the driving member forms a second limiting slope, the lower side wall of the reset guide groove forms a first limiting slope parallel to the second limiting slope, the first limiting slope is attached to the second limiting slope when the driving member moves outward to the position farthest from the inner sleeve, and the second limiting slope and the second driving slope form an avoidance groove.

[0015] In some embodiments, the upper and lower widths of the outer peripheral wall surface of the reset guide groove are equal to the upper and lower widths of the outer peripheral surface of the driving member, and the outer peripheral surface of the driving member is attached to the outer peripheral wall surface of the reset guide groove when the driving member moves outward to the position farthest from the inner sleeve.

[0016] In some embodiments, the outer periphery of the upper end of the driving member forms a second guide slope, the second guide slope is parallel to the first guide slope, and the second guide slope is in contact with the first guide slope.

[0017] In a possible implementation, the lower end of the inner sleeve is provided with a stepped groove, and the driving member is arranged in the stepped groove.

[0018] In a possible implementation, the lower part of the inner sleeve is provided with a first auxiliary guide groove, the intersection of the claw and the driving member is provided with an auxiliary guide block, and the auxiliary guide block is slidably inserted into the first auxiliary guide groove in the inward and outward directions.

[0019] In a possible implementation, the upper part of the outer periphery of the inner sleeve is provided with an external thread, and the inner side of the outer sleeve is provided with an internal thread matched with the external thread.

[0020] The solution shown in the embodiment of the present application is different from the prior art. When the distance between the claw and the inner sleeve is relatively far, the inner sleeve is mounted on the outer periphery of the shaft, and the position of the tooling is adjusted so that the claw corresponds to the screwing groove on the outer periphery of the round nut on the shaft; the position of the outer sleeve is moved downward so that the first driving inclined surface squeezes the second driving surface, thereby pushing the claw to move inward, and at the same time, the driving member and the claw move inward synchronously, and the elastic member is compressed; when the clamping end of the claw is engaged with the screwing groove of the round nut, the tooling is adapted to the round nut; finally, by manipulating the disassembly and assembly drive structure, the inner sleeve drives the claw to rotate, thereby achieving the purpose of screwing the round nut; after the operation is completed, the outer sleeve is moved upward, and under the pushing action of the elastic member, the driving member drives the claw to move outward as a whole until the claw is disengaged from the screwing groove of the round nut, and the tooling can be removed from the shaft. The shaft round nut disassembly and assembly tool of the present application has a simple and compact overall structure. The round nut can be screwed and disassembled in a smaller working area, avoiding violent disassembly and assembly. It can protect the round nut from damage and ensure that the thinner shaft will not be deformed. In addition, a universal inner sleeve is made for shafts with different shaft diameters so that the inner sleeve can be fitted onto different shafts. For different types of round nuts, the radially adjustable design of the claw position is used to improve the universal performance. There is no need to make different round nut locking tooling for different scenarios. The overall universality of the shaft round nut disassembly and assembly tool is strong, the cost of use is improved, and the convenience of use is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the use of the shaft round nut disassembly and assembly tool provided by the embodiment of the utility model Figure 1 ;

[0022] Figure 2 Schematic diagram of the use of the shaft round nut disassembly and assembly tool provided by the embodiment of the utility model Figure 2 ;

[0023] Figure 3 Schematic diagram of the use of the shaft round nut disassembly and assembly tool provided by the embodiment of the utility model Figure 3 , where the axes are not shown;

[0024] Figure 4 A cross-sectional view of the use state of the shaft round nut disassembly and assembly tool provided by the embodiment of the utility model Figure 1 ;

[0025] Figure 5 The three-dimensional tool for disassembling and assembling the round nut on the shaft provided by the embodiment of the utility model Figure 1 ;

[0026] Figure 6 The three-dimensional tool for disassembling and assembling the round nut on the shaft provided by the embodiment of the utility model Figure 2 ;

[0027] Figure 7 An exploded view of the assembly and disassembly tool for the round nut on the shaft provided by an embodiment of the present utility model;

[0028] Figure 8 A three-dimensional diagram of the inner sleeve used in an embodiment of the present utility model;

[0029] Figure 9 A cross-sectional view of the use state of the shaft round nut disassembly and assembly tool provided by the embodiment of the utility model Figure 2 ;

[0030] Description of reference numerals:

[0031] 1. Inner sleeve; 2. Outer sleeve; 3. Elastic member; 4. Clamping claw; 401. Step groove; 410. Clamping protrusion; 5. Disassembly and assembly drive structure; 510. Disassembly and assembly drive hole; 6. Drive member; 7. First drive inclined surface; 8. Second drive inclined surface; 9. First accommodating groove; 10. Second accommodating groove; 11. Guide pin; 12. First guide groove; 13. Second guide groove; 14. Reset guide groove; 15. First guide inclined surface; 16. Second guide inclined surface; 17. First limiting inclined surface; 18. Second limiting inclined surface; 19. Avoidance groove; 20. First auxiliary guide groove; 21. Auxiliary guide block; 22. Second auxiliary guide groove; 23. Shaft; 24. Round nut; 2401. Screw groove; 26. Step groove. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the claims, description and the above-mentioned drawings of the present utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is to distinguish different objects rather than to describe a specific order.

[0034] In the claims, specification and the above-mentioned drawings of the present invention, the term "inner" refers to the direction toward the central axis of the inner sleeve, and the opposite direction is "outer". Unless otherwise expressly defined, other directional words, such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0035] In the claims, specification and the above drawings of the present utility model, unless otherwise clearly defined, if the terms "fixed connection" or "fixed connection" are used, they should be understood in a broad sense, that is, any connection method without any displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0036] In the claims, description and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0037] Please also refer to Figures 1 to 9 The utility model provides a tool for disassembling and assembling a round nut on a shaft. The tool comprises an inner sleeve 1, an outer sleeve 2, a plurality of elastic members 3 and a plurality of claws 4. The outer sleeve 2 is sleeved on the outer circumference of the inner sleeve 1 and can move along the central axis of the inner sleeve 1. The upper end of the inner sleeve 1 is provided with a disassembly drive structure 5. The plurality of claws 4 are distributed around the central axis of the inner sleeve 1. The upper part of the claws 4 is provided with a driving member 6 located between the inner sleeve 1 and the outer sleeve 2. The elastic member 3 is provided between the driving member 6 and the inner sleeve 1 and is configured with a pre-tightening force that causes the driving member 6 to move outward away from the inner sleeve 1. The inner side of the outer sleeve 2 is provided with a first driving inclined surface 7. The outer circumference of the claws 4 is provided with a second driving inclined surface 8. The first driving inclined surface 7 is in contact with the second driving inclined surface 8 and can push the claws 4 to move toward the central axis of the inner sleeve 1 when the outer sleeve 2 moves downward.

[0038] In this embodiment, the driving member 6 and the clamping claw 4 are integrally formed by a casting process, or the driving member 6 and the clamping claw 4 are fixedly connected by a threaded fastener.

[0039] In this embodiment, in order to correspond to the screwing groove 2401 of the round nut 24 and maintain uniform force, the multiple claws 4 are evenly distributed around the central axis of the inner sleeve 1.

[0040] In this embodiment, a stepped groove 401 is provided at the lower end of the inner side of the claw 4, and a clamping protrusion 410 is provided in the middle of the stepped groove 401. The clamping protrusion 410 can be clamped with the screw groove 2401 on the round nut 24, and the clamping protrusion 410 and the stepped groove 401 are not connected. This design not only achieves clamping with the round nut 24, but also maximizes the structural strength of the claw 4, prevents deformation after repeated use, and extends the service life of the claw 4.

[0041] Compared with the prior art, the tooling for disassembling and assembling the round nut on the shaft provided in this embodiment is as follows: when the distance between the claw 4 and the inner sleeve 1 is relatively far, the inner sleeve 1 is sleeved on the outer periphery of the shaft 23, and the position of the tooling is adjusted so that the claw 4 corresponds to the screwing groove 2401 on the outer periphery of the round nut 24 on the shaft 23; the position of the outer sleeve 2 is moved downward so that the first driving inclined surface 7 squeezes the second driving surface, thereby pushing the claw 4 to move inward, and at the same time, the driving member 6 and the claw 4 move inward synchronously, and the elastic member 3 is compressed; when After the clamping end of the claw 4 is engaged with the screwing groove 2401 of the round nut 24, the tooling and the round nut 24 are adapted to each other; finally, by manipulating the disassembly and assembly drive structure 5, the inner sleeve 1 drives the claw 4 to rotate, thereby achieving the purpose of screwing the round nut 24; after the operation is completed, the outer sleeve 2 is moved upward, and under the pushing action of the elastic part 3, the driving part 6 drives the claw 4 to move outward as a whole until the claw 4 is disengaged from the screwing groove 2401 of the round nut 24. At this time, the tooling can be removed from the shaft 23. The on-shaft round nut disassembly and assembly tool of this embodiment has a simple and compact overall structure. The round nut 24 can be screwed and disassembled in a smaller working area to avoid violent disassembly and assembly. It can protect the round nut 24 from damage and ensure that the thinner shaft 23 will not be deformed. In addition, a universal inner sleeve 1 is made for shafts 23 with different shaft 23 diameters, so that the inner sleeve 1 can be fitted onto different shafts 23. For different types of round nuts 24, the radially adjustable design of the position of the claw 4 is used to improve the universal performance. There is no need to make different round nut 24 locking tooling for different scenarios. The on-shaft round nut disassembly and assembly tool has strong overall versatility, improved use costs, and guaranteed ease of use.

[0042] In some embodiments, the implementation methods of disassembling the drive structure 5 include but are not limited to the following:

[0043] 1) See Figures 1 to 9 The assembly and disassembly drive structure 5 includes a plurality of assembly and disassembly drive holes 510 (e.g., four) formed on the upper end surface of the inner sleeve 1. To ensure uniform force distribution, the plurality of assembly and disassembly drive holes 510 are evenly distributed around the central axis of the inner sleeve 1. The assembly and disassembly drive holes 510 are threaded holes that can be connected to a drive member such as an extension rod or a hollow ratchet wrench via threaded fasteners (or directly connected to an extension rod or a hollow ratchet wrench via plug-in connection). This drive member then drives the inner sleeve 1 in a screwed manner.

[0044] 2) As shown in the figure, the dismounting and mounting driving structure 5 includes a plurality of dismounting and mounting driving protrusions (for example, four) arranged on the upper end surface of the inner sleeve 1, which can be inserted and fixed with the insertion hole on the driving member such as the extension rod.

[0045] In some embodiments, referring to Figure 2 , the inner side of the driving member 6 is provided with a first accommodating groove 9, the outer side of the inner sleeve 1 is provided with a second accommodating groove 10 corresponding to the first accommodating groove 9, and the two ends of the elastic member 3 are respectively accommodated in the first accommodating groove 9 and the second accommodating groove 10. Among them, the two ends of the elastic member 3 respectively abut against the groove bottom surface of the first accommodating groove 9 and the groove bottom surface of the second accommodating groove 10. Through the cooperation of the first accommodating groove 9 and the second accommodating groove 10, the two ends of the elastic member 3 are positioned, so as to avoid the elastic member 3 from being skewed or falling off from the gap between the driving member 6 and the inner sleeve 1.

[0046] On the basis of the above-mentioned embodiments, referring to Figure 4 , Figure 7 and Figure 9 , in order to avoid the elastic member 3 from being skewed during stretching and contraction, the shaft round nut dismounting and mounting tool further includes a guide pin 11. In order to realize the installation of the guide pin 11, the closed end of the first accommodating groove 9 is provided with a first guide groove 12, the closed end of the second accommodating groove 10 is provided with a second guide groove 13 corresponding to the first guide groove 12, the two ends of the guide pin 11 are respectively inserted into the first guide groove 12 and the second guide groove 13, and the elastic member 3 is sleeved on the outer periphery of the guide pin 11. The guide pin 11 can support the elastic member 3 when the driving member 6 moves, so as to avoid the elastic member 3 from being skewed. In order to avoid the setting of the guide pin 11 affecting the movement of the driving member 6, one end of the guide pin 11 is fixed to the first accommodating groove 9, and the other end is slidably inserted into the second accommodating groove 10; or, one end of the guide pin 11 is fixed to the second accommodating groove 10, and the other end is slidably inserted into the first accommodating groove 9; or, the two ends of the guide pin 11 are respectively slidably inserted into the first accommodating groove 9 and the second accommodating groove 10.

[0047] Based on the scheme of providing the guide pin 11, the implementation mode of the elastic member 3 includes but is not limited to a spring (for example, a rectangular spring), a rubber sleeve, etc., which is not uniquely limited here.

[0048] In some embodiments, referring to Figure 4 and Figure 9, in order to make the overall radial size of the tool more compact, the inner side of the outer sleeve 2 is provided with a reset guide groove 14 above the first driving slope 7, and the driving member 6 is correspondingly arranged in the reset guide groove 14, so that the outer sleeve 2 can accommodate the driving member 6 through the groove to avoid excessive gap between the inner sleeve 1 and the outer sleeve 2, which causes the problem of large radial size. Based on this, the upper side wall of the reset guide groove 14 is a first guide slope 15, which is parallel to the first driving slope 7. When the pawl 4 moves in and out, the first guide slope 15 contacts the outer periphery of the driving member 6, which can provide more support contact area when the pawl 4 moves in and out, ensuring the stability of the overall movement of the driving member 6 and the pawl 4.

[0049] On the basis of the above embodiment, referring to Figure 4 and Figure 9 , the lower surface of the driving member 6 forms a second limiting slope 18, and the lower side wall of the reset guide groove 14 forms a first limiting slope 17 parallel to the second limiting slope 18. When the driving member 6 moves outward to the position farthest from the inner sleeve 1, the first limiting slope 17 is attached to the second limiting slope 18. Through the attachment of the two limiting slopes, the maximum upward movement of the outer sleeve 2 relative to the inner sleeve 1 is limited in the upward and downward directions, avoiding the outer sleeve 2 from falling off. Among them, the second limiting slope 18 and the second driving slope 8 form an avoidance groove 19 to avoid the protrusion between the first driving slope 7 and the reset guide, further improving the compactness of the structure.

[0050] In some embodiments, the upper and lower widths of the outer peripheral wall surface of the reset guide groove 14 are equal to the upper and lower widths of the outer peripheral surface of the driving member 6, and when the driving member 6 moves outward to the position farthest from the inner sleeve 1, the outer peripheral surface of the driving member 6 is attached to the outer peripheral wall surface of the reset guide groove 14, as shown in Figure 9 In this embodiment, the depth of the reset guide groove 14 is affected by the radial width of the driving member 6, and the design of the outer peripheral surface of the driving member 6 attached to the outer peripheral wall surface of the reset guide groove 14 realizes the minimization design of the depth of the reset guide groove 14. Not only can the positioning of the driving member 6 in this state be more reliable, but also it is beneficial to reduce the radial size of the outer sleeve 2, further approaching the design direction of compactness.

[0051] In some embodiments, referring to Figure 4 and Figure 9 , the outer periphery of the upper end of the driving member 6 forms a second guide slope 16, which is parallel to the first guide slope 15 and in contact with the first guide slope 15. By setting the first guide slope 15, the driving member 6 and the reset guide groove 14 are guided by surface contact, the contact area is large, which can effectively ensure the stability of the contact.

[0052] In some embodiments, referring to Figure 4、 Figures 7 to 9 The lower end of the inner sleeve 1 is provided with a stepped groove 26, and the driving member 6 is arranged in the stepped groove 26. The stepped groove 26 is used to accommodate and avoid the driving member 6, and the radial size of the driving member 6 after being assembled with the inner sleeve 1 can be further compressed under the premise of ensuring the moving stroke of the driving member 6, so that the compactness effect is further optimized.

[0053] In some embodiments, referring to Figure 7 and Figure 8 , the lower part of the inner sleeve 1 is provided with a first auxiliary guide groove 20, and the intersection of the clamping jaw 4 and the driving member 6 is provided with an auxiliary guide block 21 which is slidably arranged in the first auxiliary guide groove 20 in the inner-outer direction. The auxiliary guide block 21 is protrudingly arranged, which increases the sliding contact area with the inner sleeve 1 and further improves the stability of the sliding of the clamping jaw 4. In specific implementation, the auxiliary guide block 21 is arranged on both sides of the clamping jaw 4.

[0054] On the basis of the above embodiments, referring to Figures 7 to 9 , the first auxiliary guide groove 20 is provided below with a second auxiliary guide groove 22 which is in communication with the first auxiliary guide groove 20, and the clamping jaw 4 is slidably arranged in the second auxiliary guide groove 22 in the inner-outer direction. The second auxiliary guide groove is directly matched with the clamping jaw 4 to limit the position of the clamping jaw 4, so that the limiting contact area between the clamping jaw 4, the driving member 6 and the inner sleeve 1 is maximized. Specifically, the clamping end (the aforementioned clamping protrusion 410) of the clamping jaw 4 is below the inner sleeve 1, so as not to affect the clamping adaptation with the circular nut 24.

[0055] In order to realize the up-down movement of the outer sleeve 2 relative to the inner sleeve 1, in some embodiments, the upper part of the outer periphery of the inner sleeve 1 is provided with an external thread, and the inner side of the outer sleeve 2 is provided with an internal thread which is matched with the external thread. The threaded matching mode makes the movement of the inner sleeve 1 more continuous, and the position of the movement of the outer sleeve 2 more flexible, so that more types of circular nuts 24 can be adapted. Moreover, the threaded structure has a self-locking function, so that after being adjusted to the position, no other locking structure is needed, the position of the outer sleeve 2 is relatively stable, the structure of the whole tooling is simpler, and the number of parts is less.

[0056] Based on the above threaded matching mode, in order not to affect the screwing action of the outer sleeve 2, the first driving slope 7, the second driving slope 8, the first guide slope 15, the second guide slope 16, the first limiting slope 17 and the second limiting slope 18 are all conical surfaces, and the outer sleeve 2 and the inner sleeve 1 are both cylindrical.

[0057] In other embodiments, the outer periphery of the inner sleeve 1 is provided with a guide rail extending upward and downward, and the inner side of the outer sleeve 2 is provided with a guide groove corresponding thereto. A plurality of positioning holes are arranged on the guide rail and the guide groove in the up-down direction, respectively. After the outer sleeve 2 is adjusted to the position, the outer sleeve 2 is positioned by inserting a pin into two corresponding positioning holes.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tool for disassembling and assembling round nuts on shafts, characterized in that: It comprises an inner sleeve (1), an outer sleeve (2), a plurality of elastic members (3) and a plurality of claws (4); The outer sleeve (2) is sleeved on the outer periphery of the inner sleeve (1) and can move along the central axis (23) of the inner sleeve (1). The upper end of the inner sleeve (1) is provided with a disassembly and assembly driving structure (5); A plurality of the claws (4) are distributed around the central axis (23) of the inner sleeve (1), and a driving member (6) located between the inner sleeve (1) and the outer sleeve (2) is provided on the upper portion of the claws (4). The elastic member (3) is provided between the driving member (6) and the inner sleeve (1) and is configured with a pre-tightening force that causes the driving member (6) to move outward away from the inner sleeve (1); A first driving bevel (7) is provided on the inner side of the outer sleeve (2), and a second driving bevel (8) is provided on the outer periphery of the clamping claw (4). The first driving bevel (7) is in contact with the second driving bevel (8) and can push the clamping claw (4) to move toward the center axis (23) of the inner sleeve (1) when the outer sleeve (2) moves downward.

2. The tool for disassembling and assembling round nuts on shafts according to claim 1, characterized in that: A first accommodating groove (9) is provided on the inner side of the driving member (6), a second accommodating groove (10) corresponding to the first accommodating groove (9) is provided on the outer side of the inner sleeve (1), and both ends of the elastic member (3) are respectively accommodated in the first accommodating groove (9) and the second accommodating groove (10).

3. The tool for disassembling and assembling round nuts on shafts according to claim 2, characterized in that: The on-axis round nut disassembly and assembly tool also includes a guide pin (11), a first guide groove (12) is provided at the closed end of the first accommodating groove (9), and a second guide groove (13) corresponding to the first guide groove (12) is provided at the closed end of the second accommodating groove (10), and the two ends of the guide pin (11) are respectively inserted into the first guide groove (12) and the second guide groove (13), and the elastic member (3) is sleeved on the outer periphery of the guide pin (11).

4. The tool for disassembling and assembling round nuts on shafts according to claim 1, characterized in that: The inner side of the outer sleeve (2) is provided with a reset guide groove (14) located above the first driving inclined surface (7), and the driving member (6) is placed in the reset guide groove (14). The upper side wall of the reset guide groove (14) is a first guide inclined surface (15). The first guide inclined surface (15) is parallel to the first driving inclined surface (7). When the claw (4) moves inward and outward, the first guide inclined surface (15) contacts the outer peripheral surface of the driving member (6).

5. The tool for disassembling and assembling round nuts on shafts according to claim 4, characterized in that: The lower surface of the driving member (6) forms a second limiting inclined surface (18), and the lower side wall of the reset guide groove (14) forms a first limiting inclined surface (17) parallel to the second limiting inclined surface (18). When the driving member (6) moves outward to the position farthest from the inner sleeve (1), the first limiting inclined surface (17) is in contact with the second limiting inclined surface (18); wherein, a avoiding groove (19) is formed between the second limiting inclined surface (18) and the second driving inclined surface (8).

6. The tool for disassembling and assembling round nuts on shafts according to claim 5, characterized in that: The upper and lower widths of the outer peripheral wall of the reset guide groove (14) are equal to the upper and lower widths of the outer peripheral surface of the driving member (6). When the driving member (6) moves outward to the position farthest from the inner sleeve (1), the outer peripheral surface of the driving member (6) is in contact with the outer peripheral wall of the reset guide groove (14).

7. The tool for disassembling and assembling round nuts on shafts according to claim 4, characterized in that: A second guiding inclined surface (16) is formed on the outer periphery of the upper end of the driving member (6), and the second guiding inclined surface (16) is parallel to the first guiding inclined surface (15) and is in close contact with the first guiding inclined surface (15).

8. The tool for disassembling and assembling round nuts on shafts according to claim 1 or 4, characterized in that: A stepped groove (26) is provided at the lower end of the inner sleeve (1), and the driving member (6) is placed in the stepped groove (26).

9. The tool for disassembling and assembling round nuts on shafts according to claim 1, characterized in that: A first auxiliary guide groove (20) is provided at the lower portion of the inner sleeve (1), and an auxiliary guide block (21) is provided at the intersection of the claw (4) and the driving member (6). The auxiliary guide block (21) is slidably inserted into the first auxiliary guide groove (20) along the inward and outward directions.

10. The tool for disassembling and assembling round nuts on shafts according to claim 1, characterized in that: The upper portion of the outer circumference of the inner sleeve (1) is provided with an external thread, and the inner side of the outer sleeve (2) is provided with an internal thread adapted to the external thread.

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