Quick change nut

Abstract

This utility model discloses a quick-change nut, belonging to the field of fastening tool technology, which solves the problem of easy loosening in existing quick-change structures. The utility model includes a nut assembly with a nut body and spiral grooves of varying axial depths. A drive locking part is movably connected to the spiral grooves. The movement of the drive locking part within the spiral grooves causes axial displacement of the nut body, thereby changing the nut's tightness. An elastic preload part providing axial preload is connected to the drive locking part. This utility model, by providing spiral grooves of varying axial depths on the nut assembly, allows the drive locking part to move within the spiral grooves, achieving tightening and quick loosening of the nut. The spiral grooves of varying axial depths provide a trajectory for the movement of the drive locking part. The nut assembly provides axial preload through the elastic preload part, ensuring continuous contact between the drive locking part and the bottom of the spiral groove, thus ensuring the reliability of the nut's tightness.

Description

Technical Field

[0001] This utility model belongs to the field of fastening tool technology, and more specifically, it relates to a quick-change nut. Background Technology

[0002] Currently, fastening tools such as quick-change nuts are manually screwed onto various machines (such as angle grinders) to clamp the tools. During machine use, nuts can easily self-tighten. Ordinary nuts require tools to remove, which is complicated. However, some quick-change nuts do not require any tools; workers can simply turn them by hand to quickly loosen the nuts.

[0003] However, when using quick-change nuts, the steel balls on the locking structure roll due to the rotational tightening torque during tightening. This rolls from the deep part of the locking groove to the shallow part, causing a change in the axial fit dimensions of the assembled parts. Since the axial dimension of the retaining ring is a fixed value, and is affected by factors such as machining accuracy, the quick-change nut may have excessive axial clearance. This prevents the steel balls from contacting the deep part of the locking groove, thus preventing them from rolling from the deep part of the spiral groove to the shallow part. Consequently, the quick-change nut fails to achieve its locking function, resulting in easy loosening of the nut and poor locking reliability. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing a quick-change nut.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A quick-change nut includes a nut assembly. The nut assembly has a nut body and spiral grooves with different axial depths. A drive locking part is movably connected to the spiral groove. The nut body is axially displaced by the movement of the drive locking part in the spiral groove, thereby changing the tightness of the nut. An elastic preload part that provides axial preload is connected to the drive locking part.

[0006] Preferably, the spiral groove is provided on the nut body, and the spiral groove is distributed along the circumferential direction of the nut body, so that the driving locking part can move circumferentially on the spiral groove; The elastic preload includes an elastic element, which provides elastic compensation for the axial clearance, ensuring continuous contact between the drive locking part and the bottom of the spiral groove.

[0007] Preferably, the drive locking part includes a rolling steel ball that can roll within a helical groove; The nut body is provided with a retaining ring groove, and the elastic element engages with the retaining ring groove. The elastic element enables the elastic preload to contact the rolling steel ball, so that the rolling steel ball is in continuous contact with the spiral groove.

[0008] Preferably, the retaining ring groove is a lip-shaped annular groove structure formed on the inner periphery of the nut body, and the size of the retaining ring groove is adapted to the size of the elastic element.

[0009] Preferably, the elastic preload includes a pressure cap, which is connected to the nut body and is in contact with a rolling steel ball. An elastic element is disposed between the outer periphery of the pressure cap and the retaining spring groove, and the elastic element abuts against the pressure cap and the retaining spring groove.

[0010] Preferably, the nut assembly further includes an outer sleeve, which is disposed on the outer periphery of the nut body and is adapted to and connected to the nut body. A spiral groove is disposed on either side of the nut body and the outer sleeve that come into contact with each other. The spiral groove is distributed along the circumferential direction of the nut assembly, and the drive locking part can move circumferentially on the spiral groove. The elastic preload includes an elastic element, which provides elastic compensation for the axial clearance, ensuring continuous contact between the drive locking part and the bottom of the spiral groove.

[0011] Preferably, the drive locking part includes a rolling steel ball that can roll within a helical groove; The spiral groove is located on the upper end face of the outer sleeve. The end of the rolling steel ball contacts the spiral groove and the nut body. The elastic element is located in the axial space on the lower side of the outer sleeve. The elastic element provides axial preload to keep the rolling steel ball in continuous contact with the spiral groove.

[0012] Preferably, the elastic preload includes a pressure cap and a positioning element. Both the pressure cap and the positioning element are disposed on the outer periphery of the nut body, and the positioning element is disposed between the pressure cap and the outer sleeve. The elastic element is sleeved on the outer periphery of the nut body, and in the axial direction, the elastic element is disposed between the pressure cap and the positioning element or between the positioning element and the lower end face of the outer sleeve.

[0013] Preferably, the nut body is provided with an elastic element mounting groove and a pressure cap mounting groove, and the elastic element mounting groove and / or pressure cap mounting groove are provided with an axial clearance value.

[0014] Preferably, the elastic element is a snap ring, spring, or elastic retaining ring structure that can provide axial force.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves tightening and quick opening of the nut by setting helical grooves with different axial depths on the nut assembly and driving the locking part to move within the helical grooves. The helical grooves with different axial depths provide the running trajectory for the movement of the driving locking part. The nut assembly provides axial preload through the elastic preload part, so that the driving locking part is in continuous contact with the bottom of the helical groove, ensuring the reliability of the nut's tightness and solving the problem of easy loosening of quick-change structures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an axial sectional view of the quick-change nut of this utility model; Figure 2 This is an exploded view of the structure of Embodiment 1 of this utility model; Figure 3 This is an axonometric sectional view of Embodiment 1 of the present invention; Figure 4 This is a three-dimensional structural diagram of the nut body in Embodiment 1 of this utility model; Figure 5 This is an axial sectional view of the nut body in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the structure of the pressure cap in Embodiment 1 of this utility model; Figure 7 This is an exploded view of the structure of Embodiment 2 of this utility model; Figure 8 This is an axonometric sectional view of Embodiment 2 of the present invention; Figure 9 This utility model Figure 8 A magnified view of a portion of point A in the middle.

[0018] Explanation of symbols in the diagram: 1. Nut body; 101. Snap ring groove; 2. Spiral groove; 3. Drive locking part; 31. Rolling steel ball; 4. Elastic preload part; 5. Elastic element; 51. Snap ring; 52. Spring; 6. Pressure cap; 7. Outer sleeve; 8. Elastic pad; 9. Limiting flat washer; 10. Small ball. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] Please see Figure 1This utility model provides a quick-change nut, including a nut assembly. The nut assembly has a nut body 1 and spiral grooves 2 with different axial depths. A drive locking part 3 is movably connected to the spiral grooves 2. The nut body 1 is axially displaced by the movement of the drive locking part 3 in the spiral grooves 2, thereby realizing the change of the tightness of the nut. An elastic preload part 4 that provides axial preload force is connected to the drive locking part 3.

[0021] This invention achieves tightening and quick opening of the nut by setting spiral grooves 2 with different axial depths on the nut assembly and driving the locking part 3 to move within the spiral grooves 2. The spiral grooves 2 with different axial depths provide the running trajectory for the movement of the locking part 3. The nut assembly provides axial preload through the elastic preload part 4, so that the locking part 3 is in continuous contact with the bottom of the spiral groove 2, ensuring the reliability of the nut's tightness and solving the problem of easy loosening of quick-change structures.

[0022] The quick-change nut elastic preload part provided by this utility model has multiple implementation methods, and the specific embodiments are as follows: Example 1 like Figures 1-3 As shown, in this embodiment, the spiral groove 2 is provided on the nut body 1. The spiral groove 2 is distributed along the circumferential direction of the nut body 1, and the driving locking part 3 can move circumferentially in the spiral groove 2.

[0023] Specifically, the spiral groove 2 is located on the lower side of the nut body 1 at the end that connects with the elastic preload part 4. The groove depth of the spiral groove 2 along the circumference of the nut body 1 is different, presenting a sloped helix structure, which can be adapted to drive the locking part 3. When the nut rotates, the locking state changes by changing the groove depth.

[0024] In this embodiment, the drive locking part 3 connected inside the spiral groove 2 includes a rolling steel ball 31. The rolling steel ball 31 can roll inside the spiral groove 2. Since the spiral groove 2 has a helix angle, the rolling steel ball 31 will generate a compound motion of "rotation along the groove + translation along the axis" when it rolls inside the spiral groove 2. This not only realizes the circumferential position change, but also the axial movement of the nut body 1. Then, the tightening and loosening of the nut body 1 is realized through the inclined plane transmission. The tightness and loosening state is determined by the direction of movement. In the unlocked state, the rolling steel ball 31 is in the deep position of the spiral groove 2. In the locked state, the rolling steel ball 31 is in the shallow position of the spiral groove 2. Under the action of the elastic preload part 4, the rolling steel ball 31 can continuously contact the spiral groove 2. The elastic preload part 4 can continuously apply axial preload force to the rolling steel ball 31 to ensure the locking stability and prevent the nut from loosening.

[0025] like Figure 2 , Figure 3As shown, the elastic preload part 4 includes an elastic element 5 and a pressure cap 6. The pressure cap 6 is connected to the nut body 1. The nut body 1 has an elastic element mounting groove and a pressure cap mounting groove. The elastic element 5 is disposed in the elastic element mounting groove of the nut body 1. The upper end of the pressure cap 6 is connected to the pressure cap mounting groove. The rolling steel ball 31 is disposed between the spiral groove 2 and the pressure cap 6, and the pressure cap 6 is in contact with the rolling steel ball 31. In this embodiment, the elastic element 5 provides elastic compensation for the axial clearance, so that the rolling steel ball 31 is in continuous contact with the bottom of the spiral groove 2.

[0026] Specifically, in this embodiment, the elastic element 5 includes a retaining spring 51. The elastic element mounting groove on the nut body 1 is a retaining spring groove 101. The retaining spring groove 101 is an annular groove structure arranged circumferentially along the nut body 1, and the retaining spring groove 101 is located on the outer circumferential side of the spiral groove 2. The retaining spring 51 is engaged between the outer circumferential side of the pressure cap 6 and the inner circumferential side of the retaining spring groove 101, and the retaining spring 51 abuts against the pressure cap 6 and the retaining spring groove 101. The retaining spring 51 engages in the retaining spring groove 101 through its own elastic deformation, while simultaneously pressing the pressure cap 6, so that the upper end surface of the pressure cap 6 is always pressed against the rolling steel ball 31, so that the rolling steel ball 31 is in continuous contact with the spiral groove 2, ensuring that the rolling steel ball 31 is always in the deep position of the spiral groove 2 in the natural state of the nut, and achieving reliable contact.

[0027] In this embodiment, a spiral groove 2 with a helix angle is provided on the nut body 1, allowing the rolling steel ball 31 to roll within the groove. When tightening the nut, due to the rotational tightening torque, the rolling steel ball 31 rolls from the deep position to the shallow position of the spiral groove 2. This causes a change in the axial fit dimensions of the assembled parts. By providing an adjustable axial clearance value snap ring 51 on the outside of the pressure cap 6 that contacts the rolling steel ball 31, when the axial position of the rolling steel ball 31 changes, it can produce a slight movement under the axial preload of the snap ring 51, eliminating the axial clearance value of the quick-change nut. Since the snap ring 51 is elastic, it can adapt to slight dimensional changes. The snap ring 51 generates an upward thrust, which ensures that the pressure cap 6 always presses on the rolling steel ball 31, thus ensuring that the steel ball is always in the deep position of the spiral groove 2 in the natural state, achieving reliable contact. When locking, it ensures that the rolling steel ball 31 rolls stably from the deep position to the shallow position of the spiral groove 2, achieving reliable locking of the quick-change nut.

[0028] Furthermore, in this embodiment, as Figures 4-6 As shown, the snap ring groove 101 is a lip-shaped annular groove structure formed on the inner circumference of the nut body 1. The size of the snap ring groove 101 is adapted to the size of the snap ring 51, and the slope angle of the snap ring groove 101 is consistent with the slope angle of the pressure cap 6 in contact with the snap ring 51. When the pressure cap 6 is assembled, its slope in contact with the snap ring 51 can exert pressure on the snap ring 51. The consistent angle ensures the effective transmission of the snap ring 51's elastic force, guarantees the stability after assembly, and prevents deformation or displacement.

[0029] Furthermore, in this embodiment, the nut body 1 is provided with an elastic element mounting groove and a pressure cap mounting groove, and the elastic element mounting groove and / or the pressure cap mounting groove are provided with an axial clearance value, so that the retaining spring 51, which is the elastic element 5, has axial deformation space.

[0030] Furthermore, as a preferred embodiment, the helix angle of the spiral groove 2 can be adjusted according to the axial clearance value of the nut to ensure smooth transmission and rapid response of the rolling steel balls 31. The number of rolling steel balls 31 is matched with the number of spiral grooves 2 on the nut body 1, and several spiral grooves 2 are evenly distributed along the circumference of the nut body 1.

[0031] Furthermore, in this embodiment, the elastic element 5 can be a snap ring 51 that provides axial elastic force, or it can be a spring sheet, elastic retaining ring or other elastic components. It can be flexibly replaced according to the actual working conditions and needs, making it more applicable.

[0032] This embodiment has a simple structure and is easy to operate. By setting spiral grooves 2 with different axial depths on the nut body 1, the rolling steel ball 31 moves in the spiral grooves 2 to achieve the tightening and quick opening of the nut. The spiral grooves 2 with different axial depths provide the running trajectory for the movement of the rolling steel ball. The pressure cover 6 provides axial preload through the snap ring 51, so that the rolling steel ball 31 is in continuous contact with the bottom of the spiral groove 2, ensuring the reliability of the nut's tightness and solving the problem of easy loosening of the quick-change structure.

[0033] Example 2 In this embodiment, as Figure 7 As shown, the nut assembly also includes an outer sleeve 7, which is disposed on the outer periphery of the nut body 1. The outer sleeve 7 is adapted to and connected to the nut body 1. The spiral groove 2 is disposed on either side of the nut body 1 and the outer sleeve 7 that are in contact. The spiral groove 2 is distributed along the circumferential direction of the outer sleeve 7. The drive locking part 3 can move circumferentially on the spiral groove 2.

[0034] Specifically, the spiral groove 2 is provided on the upper end face where the outer sleeve 7 connects with the nut body 1. The spiral groove 2 is distributed along the circumferential direction of the outer sleeve 7, and the driving locking part 3 can move circumferentially on the spiral groove 2. The groove depth of the spiral groove 2 along the circumferential direction of the outer sleeve 7 is different, presenting a sloped helix structure, which can be adapted to the driving locking part 3. When the nut rotates, the locking state changes by the change of groove depth.

[0035] In this embodiment, the drive locking part 3 connected to the spiral groove 2 includes a rolling steel ball 31. The lower end of the rolling steel ball 31 is connected to the spiral groove 2, and the upper end of the rolling steel ball 31 is in contact with the nut body 1. The rolling steel ball 31 is disposed between the spiral groove 2 and the nut body 1. The rolling steel ball 31 can roll in the spiral groove 2. Since the spiral groove 2 has a helix angle, the rolling steel ball 31 will generate a compound motion of "rotation along the groove + translation along the axis" when it rolls in the spiral groove 2. This not only realizes the circumferential position change, but also the axial movement of the nut body 1. In turn, the tightening and loosening of the nut body 1 is realized through the inclined plane transmission. The direction of movement determines its tightening and loosening state. In the unlocked state, the rolling steel ball 31 is in the deep position of the spiral groove 2. In the locked state, the rolling steel ball 31 is in the shallow position of the spiral groove 2. Furthermore, the elastic element 5 is located in the axial space below the outer sleeve 7. The elastic element 5 provides axial preload to achieve contact connection between the elastic preload part 4 and the lower end face of the outer sleeve 7. Under the action of the elastic preload part 4, the elastic element 5 will continuously apply axial preload to the rolling steel ball 31, so that the rolling steel ball 31 is in continuous contact with the spiral groove 2, ensuring the stability of the nut locking state and preventing the nut from loosening.

[0036] like Figure 8 , Figure 9 As shown, the elastic preload part 4 includes an elastic element 5 and a pressure cap 6. The pressure cap 6 is connected to the nut body 1. The outer periphery of the nut body 1 is provided with an elastic element mounting groove and a pressure cap mounting groove. The elastic element 5 is sleeved on the outer periphery of the nut body 1 and is connected to the elastic element mounting groove. The inner periphery of the pressure cap 6 is connected to the pressure cap mounting groove, and the pressure cap 6 is sleeved on the outer periphery of the end of the nut body 1. In this embodiment, the elastic element 5 provides elastic compensation for the axial clearance, so that the rolling steel ball 31 is in continuous contact with the bottom of the spiral groove 2.

[0037] Furthermore, the elastic preload part 4 includes a positioning element, which is disposed between the pressure cap 6 and the outer sleeve 7. The positioning element is provided with an elastic pad 8 and a limiting flat washer 9. Both the elastic pad 8 and the limiting flat washer 9 are sleeved on the outer periphery of the nut body 1, and the limiting flat washer 9 is disposed at the lower axial end of the elastic pad 8. The nut assembly is provided with small balls 10, which are disposed between the pressure cap 6 and the elastic pad 8. The limiting flat washer 9 is disposed between the small balls 10 and the elastic pad 8, and the limiting flat washer 9 ensures that the raceway of the small balls 10 is complete and continuous.

[0038] In this embodiment, the elastic element 5 includes a spring sheet 52, which is a conical thin ring structure. The elastic element mounting groove on the nut body 1 is a spring sheet groove, which is arranged along the circumference of the nut body 1. The spring sheet 52 is snapped between the upper end of the pressure cap 6 and the lower end of the limiting flat washer 9, and the spring sheet 52 abuts against the pressure cap 6 and the limiting flat washer 9. The spring sheet 52 is snapped into the spring sheet groove by its own elastic deformation, while pressing the pressure cap 6 and the limiting flat washer 9 at its upper end. Then, through the transmission of axial force of the components, the rolling steel ball 31 is kept in continuous contact with the spiral groove 2, so that the nut body 1 is always pressed on the rolling steel ball 31, ensuring that the steel ball is always in the deep position of the spiral groove 2 in the natural state of the nut, and achieving reliable contact.

[0039] Furthermore, in this embodiment, the specific position of the spring piece 52 can be adjusted as needed, and is not limited to being positioned only between the pressure cap 6 and the limiting flat washer 9. In the axial direction of the nut body 1, the spring piece 52 can also be positioned in the upper space of the limiting flat washer 9, such as between the upper end face of the limiting flat washer 9 and the lower end face of the elastic pad 8. In this case, the spring piece 52 is engaged between the limiting flat washer 9 and the elastic pad 8. Alternatively, the spring piece 52 can be positioned in the upper space of the elastic pad 8, such as between the upper end face of the elastic pad 8 and the lower end face of the outer sleeve 7. In this case, the spring piece 52 is engaged between the elastic pad 8 and the outer sleeve 7. The spring piece 52 generates an upward thrust through its own elastic deformation. This force can ensure that the rolling steel ball 31 is always positioned in the spiral groove 2 and that the rolling steel ball 31 is in continuous contact with the bottom of the spiral groove 2, thereby achieving a stable locking state for the nut.

[0040] In this embodiment, a spiral groove 2 with a helix angle is provided on the upper end face of the outer sleeve 7. The rolling steel ball 31 can roll within the spiral groove 2. When tightening the nut, rotating the outer sleeve 7 causes the nut body 1 to rotate through the matching connection structure between the outer sleeve 7 and the nut body 1. Due to the rotational tightening torque, when the nut is loose, the rolling steel ball 31 is in the deep position of the spiral groove 2. When the nut is tightened, the rolling steel ball 31 is in the shallow position of the spiral groove 2. The rolling steel ball 31 rolls from the deep position to the shallow position of the spiral groove 2, which causes a change in the axial fit dimension of the assembled parts. This is achieved by the outer sleeve 7 in contact with the rolling steel ball 31. An adjustable axial clearance spring 52 is provided in the axial region of the lower end face. When the axial position of the rolling steel ball 31 changes, it can move slightly under the action of the axial preload of the spring 52, eliminating the axial clearance of the quick-change nut. Since the spring 52 is elastic, it can adapt to small size changes. The spring 52 generates an upward thrust, which can ensure that the rolling steel ball 31 set in the spiral groove 2 is engaged between the lower end face of the nut body 1 and the spiral groove 2 of the outer sleeve 7, achieving reliable contact. When locking, it can ensure that the rolling steel ball 31 rolls stably from the deep position to the shallow position of the spiral groove 2, achieving reliable locking of the quick-change nut.

[0041] Furthermore, as a preferred embodiment, the specific structure of the spring piece 52 can be adjusted according to usage requirements, and can be set as a hollow annular, tapered inclined structure, the inclination angle of which can be adapted and adjusted; and the specific setting position of the spring piece 52 can be adapted and adjusted according to the specific working conditions of the quick-change nut. The spring piece 52 can be set in the axial space between the outer sleeve 7 and the pressure cover 6 according to the anti-loosening requirements, installation space, force, etc. By reasonably setting the spring piece, the contact stability of each component is enhanced, and the combination of nut + spring piece can be adapted to more scenarios, improving the practicality and reliability of the overall structure.

[0042] Furthermore, in this embodiment, the nut body 1 is provided with an elastic element mounting groove and a pressure cap mounting groove, and the elastic element mounting groove and / or pressure cap mounting groove are provided with an axial clearance value, so that the elastic piece 52, which is an elastic element, has axial deformation space.

[0043] Furthermore, as a preferred embodiment, the number of rolling steel balls 31 is matched with the number of spiral grooves 2 on the nut body, and several spiral grooves 2 are evenly distributed along the circumference of the nut body 1.

[0044] In this embodiment, the elastic element 5 can be a spring sheet 52 that can provide axial elastic force, or it can be a snap ring, elastic retaining ring or other elastic components. It can be flexibly replaced according to the actual working conditions and needs, making it more applicable.

[0045] This invention provides a quick-change nut, including a nut assembly. The nut assembly has a nut body 1 and spiral grooves 2 with different axial depths. A rolling steel ball 31 is movably connected to the spiral grooves 2. The movement of the rolling steel ball 31 within the spiral grooves 2 causes axial displacement of the nut body 1, thereby changing the tightness of the nut. An elastic preload part 4 providing axial preload is connected to the lower end face of the rolling steel ball 31. This invention achieves tightening and quick unlocking of the nut by setting spiral grooves 2 with different axial depths on the nut assembly and allowing the rolling steel ball 31 to move within the spiral grooves 2. The spiral grooves 2 with different axial depths provide a running trajectory for the movement of the rolling steel ball 31, completing the locking or unlocking of the quick-change nut. When the axial position of the rolling steel ball 31 changes, an elastic element such as a snap ring 51 or a spring 52 with an adjustable axial clearance value is provided in the axial area in contact with the rolling steel ball 31. The elastic element 5 can apply a continuous axial preload. Under the action of the axial preload of the elastic element 5, a small movement can be generated, eliminating the axial clearance value of the quick-change nut. Since the elastic element 5 is elastic, it can adapt to small dimensional changes. The elastic element 5 generates an upward thrust, which can ensure that the rolling steel ball 31 set in the spiral groove 2 is in continuous contact with the bottom of the spiral groove 2, ensuring the reliability of the nut's tightness. This not only realizes the quick release of the nut and facilitates operation, but also solves the problem of easy loosening of the quick-change structure.

[0046] In the description of this utility model, it should be understood that terms such as “length”, “width”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, and “outer” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Furthermore, in the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A quick-change nut, comprising a nut assembly, wherein the nut assembly includes a nut body, characterized in that, The nut assembly is provided with spiral grooves of different axial depths. A drive locking part is movably connected to the spiral groove. The axial displacement of the nut body is achieved by the movement of the drive locking part in the spiral groove, thereby realizing the change of the tightness of the nut. An elastic preload part that provides axial preload is connected to the drive locking part.

2. A quick-change nut according to claim 1, characterized in that, The spiral groove is provided on the nut body and is distributed along the circumferential direction of the nut body. The drive locking part can move circumferentially on the spiral groove. The elastic preload includes an elastic element, which provides elastic compensation for axial clearance, ensuring continuous contact between the drive locking part and the bottom of the spiral groove.

3. A quick-change nut according to claim 2, characterized in that, The drive locking part includes a rolling steel ball that can roll within the spiral groove; The nut body is provided with a retaining spring groove, and the elastic element is engaged with the retaining spring groove. The elastic element enables the elastic preload to contact and connect with the rolling steel ball, so that the rolling steel ball is in continuous contact with the spiral groove.

4. A quick-change nut according to claim 3, characterized in that, The retaining ring groove is a lip-shaped annular groove structure formed on the inner periphery of the nut body, and the size of the retaining ring groove is adapted to the size of the elastic element.

5. A quick-change nut according to claim 3, characterized in that, The elastic preload includes a pressure cap, which is connected to the nut body and in contact with the rolling steel ball. The elastic element is disposed between the outer periphery of the pressure cap and the retaining spring groove, and abuts against the pressure cap and the retaining spring groove.

6. A quick-change nut according to claim 1, characterized in that, The nut assembly also includes an outer sleeve, which is disposed on the outer periphery of the nut body and is adapted to and connected to the nut body. The spiral groove is disposed on either side of the nut body and the outer sleeve that are in contact with each other. The spiral groove is distributed along the circumferential direction of the nut assembly, and the drive locking part can move circumferentially on the spiral groove. The elastic preload includes an elastic element, which provides elastic compensation for axial clearance, ensuring continuous contact between the drive locking part and the bottom of the spiral groove.

7. A quick-change nut according to claim 6, characterized in that, The drive locking part includes a rolling steel ball that can roll within the spiral groove; The spiral groove is disposed on the upper end face of the outer sleeve, the end of the rolling steel ball is in contact with the spiral groove and the nut body, and the elastic element is disposed in the axial space on the lower side of the outer sleeve. The elastic element provides axial preload to keep the rolling steel ball in continuous contact with the spiral groove.

8. A quick-change nut according to claim 7, characterized in that, The elastic preload includes a pressure cap and a positioning member. Both the pressure cap and the positioning member are disposed on the outer periphery of the nut body, and the positioning member is disposed between the pressure cap and the outer sleeve. The elastic member is sleeved on the outer periphery of the nut body, and in the axial direction, the elastic member is disposed between the pressure cap and the positioning member or between the positioning member and the lower end face of the outer sleeve.

9. A quick-change nut according to claim 5 or 8, characterized in that, The nut body is provided with an elastic element mounting groove and a pressure cap mounting groove, and the elastic element mounting groove and / or the pressure cap mounting groove are provided with an axial clearance value.

10. A quick-change nut according to claim 9, characterized in that, The elastic element can be a snap ring, spring, or elastic retaining ring structure that can provide axial force.

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