Tightening device
By designing the tightening device of the rotating shaft and limit sleeve, the problems of high labor intensity, low operating efficiency, inconsistent tightening status and non-standardization of bolts are solved, and the parts are efficient and standardized tightening are achieved.
Patent Information
- Application Number
- CN202420190520.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-01-25
AI Technical Summary
In the prior art, manual tightening bolts and other methods have problems such as high labor intensity, low operating efficiency, inconsistent tightening status and non-standardization.
Design a tightening device including a rotating shaft and a limit sleeve. Through the design of the limit sleeve, the distance of the part to be tightened in the axial direction of the rotating shaft is a set distance, thereby achieving the expected tightening state and standardization of the part. consistency.
The simple, convenient and efficient tightening process of the parts to be tightened is realized, ensuring the standardization and consistency of multiple tightenings, and reducing operational difficulty and time consumption.
Smart Images
Figure CN222429907U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tightening parts, in particular to a tightening device. Background Art
[0002] In the field of vehicle assembly and manufacturing, many parts need to be tightened to achieve fastening and fixation, including bolts, buffer pads, etc. In addition, there are parts that need to be pre-assembled or not completely tightened to expose parts. The above process is generally completed by manual work in the prior art. The problems of this method are high labor intensity, low work efficiency, and it is difficult to achieve consistency and standardization of the tightening state of the parts. Utility Model Content
[0003] The utility model aims to provide a tightening device to solve the technical problems of manual bolt tightening in the prior art, such as high labor intensity, low working efficiency, inconsistent and non-standard tightening state, etc.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0005] A tightening device, comprising a rotating shaft and a limiting sleeve; the rotating shaft has a first end and a second end, the first end is used to connect to a rotating drive device, and the second end is provided with a mounting portion, the mounting portion is used to mount and fix a part to be tightened, and the contact surface of the mounting portion with the top of the part to be tightened is a first surface; the limiting sleeve is connected and arranged at the second end of the rotating shaft; along the axial direction of the rotating shaft, the surface of the limiting sleeve that is away from the first end of the rotating shaft is a second surface, the second surface is located on the side of the first surface that is away from the first end of the rotating shaft, and there is a set distance between the second surface and the first surface.
[0006] According to the above technical solution, the tightening device includes a rotating shaft and a limiting sleeve. Through the provided limiting sleeve, it can be ensured that the distance between the second surface on the limiting sleeve and the first surface on the mounting portion in the axial direction of the rotating shaft is the set distance. In this case, in the process of using the tightening device to tighten the part to be tightened, it is only necessary to confirm that the part to be tightened is screwed in to the required depth when the lower end surface of the limiting sleeve, i.e., the second surface, contacts the target object, and the part to be tightened reaches the expected tightening state, and the part to be tightened relative to the target object is also the required exposed length. After that, it is only necessary to control the rotating shaft to stop rotating. The above process of tightening the part to be tightened to the expected tightening state is simple, convenient, and efficient, and the process of multiple tightening will have good standardization and consistency.
[0007] Furthermore, the limiting sleeve and the rotating shaft are movably connected to each other so that the limiting sleeve and the rotating shaft can rotate relative to each other in the circumferential direction of the rotating shaft.
[0008] According to the above technical solution, in the process of tightening the parts to be tightened, although the rotating shaft continues to rotate, the limiting sleeve may not rotate with it, and may be in a fixed state, or although it rotates, the rotation speed is significantly slower than that of the rotating shaft (in a natural state without external interference). In this way, the limiting sleeve can be operated by hand by the operator. Before tightening the parts to be tightened, the operator can better align the parts to be tightened with a specific position on the target object by holding the limiting sleeve by hand; during the tightening process, the operator can also better ensure the stability of the state between the parts to be tightened and the target object by holding the limiting sleeve by hand, thereby ensuring the stability of the tightening process, thereby achieving a good tightening effect and good reliability.
[0009] Furthermore, the tightening device also includes a retaining frame, which is sleeved on the outer periphery of the rotating shaft; the retaining frame is fixed relative to the rotating shaft in the axial direction of the rotating shaft, fixed to the second end, and is located on two opposite sides of the limiting sleeve with the mounting part; the limiting sleeve is respectively provided with a first ball half-groove on both sides facing the retaining frame and the mounting part, and the mounting part and the retaining frame are respectively provided with a second ball half-groove, at least one of the first ball half-groove and the second ball half-groove is annular, and the first ball half-groove and the second ball half-groove are arranged corresponding to each other; the tightening device also includes two groups of balls; the two groups of balls are respectively arranged in the space defined by the first ball half-groove of the limiting sleeve and the second ball half-groove of the mounting part, and in the space defined by the first ball half-groove of the limiting sleeve and the second ball half-groove of the retaining frame.
[0010] According to the above technical solution, the retaining frame and the mounting part are respectively arranged on both sides of the limiting sleeve, which can provide fixing and limiting functions for the limiting sleeve, so that the limiting sleeve is relatively fixed with the rotating shaft in the axial direction of the rotating shaft, and the limiting sleeve will not move along the axial direction of the rotating shaft. Between the retaining frame and the limiting sleeve, and between the limiting sleeve and the mounting part, there are respectively arranged balls and a first ball half groove and a second ball half groove for accommodating the balls, so that the limiting sleeve as a whole can rotate asynchronously relative to the rotating shaft in the circumferential direction of the rotating shaft. When the rotating shaft rotates to tighten the parts to be tightened, the limiting sleeve can not rotate or rotate at a speed lower than that of the rotating shaft, thereby providing conditions and basis for the operator to hold the limiting sleeve by hand.
[0011] Furthermore, the tightening device also includes a limiting nut; the limiting nut is sleeved on the outer circumference of the rotating shaft and is located on the side of the retaining frame facing away from the limiting sleeve; the limiting nut is threadedly engaged with the outer circumference of the rotating shaft to threadably fix the retaining frame on the rotating shaft.
[0012] According to the above technical solution, by providing a limit nut and threading it with the rotating shaft, the retainer can be fastened to the rotating shaft. In the axial direction of the rotating shaft, the retainer is fixed and will not move along the axial direction of the rotating shaft. In this case, the retainer can provide a limit function for the limit sleeve above the limit sleeve, so that the position of the limit sleeve relative to the rotating shaft in the axial direction of the rotating shaft is fixed.
[0013] Further, the second ball half groove is an annular groove; the first ball half groove is a single-point hemispherical groove, the number of the first ball half grooves is multiple, and they are distributed at intervals along the annular ring corresponding to the second ball half groove; or, the first ball half groove is an annular groove; the second ball half groove is a single-point hemispherical groove, the number of the second ball half grooves is multiple, and they are distributed at intervals along the annular ring corresponding to the first ball half groove; or, the first ball half groove and the second ball half groove are both annular grooves.
[0014] According to the above technical solution, each ball is driven by the second ball half groove to rotate on itself or revolve around the rotating axis, and does not transmit the force to the limiting sleeve or only partially transmits the force to the limiting sleeve, thereby achieving the limit sleeve not rotating synchronously with the retaining frame and the mounting part.
[0015] Furthermore, a lubricating oil injection hole is provided on the limiting sleeve, and the lubricating oil injection hole is connected to the second ball half groove provided on the mounting portion, or is connected to the first ball half groove provided on the limiting sleeve corresponding to the second ball half groove.
[0016] According to the above technical solution, by setting a lubricating oil injection hole, lubricating oil can be injected into the first ball half groove and the second ball half groove between the limiting sleeve and the mounting portion, thereby making it easier to reduce the friction between the ball and the first ball half groove and the second ball half groove. This can better reduce the force exerted on the ball from the second ball half groove, and better reduce the force transmitted from the ball to the first ball half groove, which is more helpful to enhance the non-followability of the limiting sleeve with respect to the rotation of the rotating shaft.
[0017] Furthermore, the tightening device also includes a magnet, and the magnet is arranged in the mounting portion of the second end of the rotating shaft.
[0018] According to the above technical solution, a magnet is arranged in the mounting portion, and the bolt can be adsorbed and fixed in the mounting portion in a magnetic way.
[0019] Furthermore, a mark for visual identification is provided on the outer circumference of the limiting sleeve in an area connected to the second surface.
[0020] According to the above technical solution, by setting a mark, it is possible to promptly know by visual identification when the second surface on the limiting sleeve approaches the target object and the two are in contact, and after knowing it, the rotation drive device can be promptly controlled to stop driving the rotating shaft to rotate.
[0021] Furthermore, the mark is a color ring or a metal strip or a light strip.
[0022] According to the above technical solution, the color ring, metal strip, and light strip can be distinguished from other areas of the limit sleeve and the target object in one or more aspects such as color, reflective shape, contrast, and brightness, and can be visually identified in a more eye-catching manner.
[0023] Furthermore, the limiting sleeve includes a movable portion, the movable portion can be extended and retracted along the axial direction of the rotating shaft, and the second surface is located on the movable portion, so that the set distance between the second surface and the first surface is adjustable.
[0024] According to the above technical solution, the movable part can be extended and retracted along the axial direction of the rotating shaft, and the second surface is arranged on the movable part. In this way, when tightening parts of different types and specifications to be tightened, there is no need to replace the limiting sleeve, and only the extension and retraction range of the movable part needs to be adjusted, thereby saving manpower and time, and completing the tightening operations of different parts to be tightened with higher efficiency.
[0025] Furthermore, the movable portion includes the limiting sleeve as a whole, and the limiting sleeve is movably connected to the rotating shaft along the circumference of the rotating shaft.
[0026] According to the above technical solution, the entire limiting sleeve is a movable part, that is, in the axial direction of the rotating shaft, the limiting sleeve and the rotating shaft are movably connected. The limiting sleeve can change its position in the axial direction of the rotating shaft, and achieves extension and retraction by changing the position, thereby achieving the increase or decrease of the distance between the first surface and the second surface.
[0027] Furthermore, the limiting sleeve includes a fixed portion and a movable portion; the fixed portion is connected to the rotating shaft, and the movable portion is connected to the fixed portion and can move axially along the rotating shaft relative to the fixed portion.
[0028] According to the above technical solution, the fixed portion of the limiting sleeve is fixed between the rotating shaft in the axial direction of the rotating shaft, and the movable portion is connected to the fixed portion and can move relative to the fixed portion along the axial direction of the rotating shaft, so that the distance between the first surface and the second surface can be changed by moving the position of the movable portion to match the parts to be tightened of different types and specifications and their expected tightening states.
[0029] Furthermore, the movable part and the fixed part are connected by threads, and screwing in and out is achieved by rotating the threads.
[0030] According to the above technical solution, the movable part and the fixed part can be screwed in and out through the threaded connection, thereby changing the distance between the first surface and the second surface to match the parts to be tightened of different types and specifications and their expected tightening states.
[0031] Beneficial effects of the utility model:
[0032] The tightening device provided by the embodiment of the utility model includes a rotating shaft and a limiting sleeve. The limiting sleeve can ensure that the distance between the second surface on the limiting sleeve and the first surface on the mounting portion in the axial direction of the rotating shaft is a set distance. In this case, in the process of using the tightening device to tighten the parts to be tightened, it is only necessary to confirm that the parts to be tightened are screwed in to the required depth when the lower end surface of the limiting sleeve, i.e., the second surface, contacts the target object, and the parts to be tightened reach the expected tightening state, and the exposed part of the parts to be tightened relative to the target object is also the required exposed length. After that, it is only necessary to control the rotating shaft to stop rotating. The above process of tightening the parts to be tightened to the expected tightening state is simple, convenient, and efficient, and the process of multiple tightening will have good standardization and consistency. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a structural schematic diagram of the tightening device in the utility model;
[0034] Figure 2 for Figure 1 The disassembled state of the tightening device shown Figure 1 ;
[0035] Figure 3 for Figure 1 The disassembled state of the tightening device shown Figure 2 ;
[0036] Figure 4 for Figure 1 A schematic diagram of the tightening device shown in the front view direction;
[0037] Figure 5 for Figure 1 A schematic diagram of the tightening device shown in the upward direction;
[0038] Figure 6 for Figure 1 A schematic diagram of the tightening device shown in the top view direction;
[0039] Figure 7 for Figure 4 Schematic cross-sectional view along the AA direction;
[0040] Figure 8 for Figure 4 A schematic cross-sectional view along the BB direction;
[0041] Fig. 9 for Figure 4 A schematic cross-sectional view along the CC direction;
[0042] Fig.10 for Figure 1 A schematic diagram of the rotating shaft in the tightening device shown in the front view direction;
[0043] Fig.11 for Fig.10 Schematic cross-sectional view along the DD direction;
[0044] Fig.12 for Figure 1 A schematic diagram of a limiting sleeve in the tightening device shown in the front view direction;
[0045] Fig.13 for Fig.12 A schematic cross-sectional view along the EE direction;
[0046] Fig.14 It is a schematic diagram when the tightened part is a bolt;
[0047] Fig.15 This is a schematic diagram when the tightened part is a buffer pad;
[0048] Fig.16 is a schematic diagram of a target object when the tightened part is a bolt;
[0049] Fig.17 Schematic diagram of the target object when the tightened part is a buffer pad.
[0050] in:
[0051] 1-rotating shaft; 11-first end; 12-second end; 13-mounting portion; 14-magnet;
[0052] 2-limit sleeve; 21-lubricating oil injection hole; 22-mark;
[0053] 3-cage;
[0054] 4-limiting nut;
[0055] 51-first ball half groove; 52-second ball half groove;
[0056] 6-Ball;
[0057] S1-first side; S2-second side;
[0058] O1-bolt; O2-buffer pad;
[0059] M-target object. DETAILED DESCRIPTION
[0060] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.
[0061] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.
[0062] The embodiments of the tightening device provided by the utility model are described below in conjunction with the accompanying drawings.
[0063] In one embodiment of the tightening device of the present invention, see Figures 1 to 13 The tightening device includes a rotating shaft 1 and a limiting sleeve 2. The rotating shaft 1 has a first end 11 and a second end 12, wherein the first end 11 is used to connect to a rotating drive device, and the second end 12 is provided with a mounting portion 13, wherein the mounting portion 13 is used to mount and fix the part to be tightened, and the surface of the mounting portion 13 that contacts the top of the part to be tightened is a first surface S1. The limiting sleeve 2 is connected and arranged at the second end 12 of the rotating shaft 1; along the axial direction of the rotating shaft 1, the surface of the limiting sleeve 2 that is away from the first end 11 of the rotating shaft 1 is a second surface S2, and the second surface S2 is located on the side of the first surface S1 that is away from the first end 11 of the rotating shaft 1, and there is a set distance between the second surface S2 and the first surface S1.
[0064] In this embodiment, the parts to be tightened may specifically be bolts O1, buffer pads O2, etc. The bolts O1 may be Fig.14 As shown, the cushion O2 is Fig.15As shown. When tightening, the ends of parts such as bolts O1 and buffer pads O2 are fixed on the mounting portion 13 of the second end 12 of the rotating shaft 1. Afterwards, the rotating shaft 1 is rotated under the drive of the external rotary drive device connected to its first end 11. During the rotation process, the bolts O1 and buffer pads O2 and other parts will be screwed into the target object, thereby achieving the tightening and assembly of the bolts O1 and buffer pads O2 and other parts on the target object. When the part to be tightened is the bolt O1, the target object M is as shown in FIG. Fig.16 As shown, when the part to be tightened is a buffer pad O2, the target object M is as follows Fig.17 shown.
[0065] In this embodiment, when the tightening device tightens and assembles the bolts O1 and buffer pads O2 waiting to be tightened, the "tightening" does not mean that the bolts O1 and buffer pads O2 are completely tightened or tightened to the limit. According to actual needs, at a certain stage or at the end of the general assembly process, the bolts O1 and buffer pads O2 waiting to be tightened can be screwed into any intermediate state under the drive of the rotating shaft 1, and the head ends of the bolts O1 and buffer pads O2 waiting to be tightened can be partially exposed, that is, the bolts O1 and buffer pads O2 can be in a pre-tightened or semi-tightened state. In short, the meaning of tightening in this embodiment is only a conventional expression in the field for screwing the bolts O1, buffer pads O2 and other parts into the target object by rotation.
[0066] For ease of description, unless otherwise specified, the direction of the first end 11 of the rotating shaft 1 relative to the second end 12 is considered as upward, and the direction of the second end 12 relative to the first end 11 is considered as downward.
[0067] In this embodiment, the rotary drive device connected to the first end 11 of the rotating shaft 1 located on the upper side can be, for example, a rotary motor, a rotary cylinder, etc. The rotary motor and the rotary cylinder can be fixed or a small handheld device, such as an electric screwdriver, an electric wrench, etc. The mounting portion 13 located at the second end 12 on the lower side can specifically have a groove shape, and the shape of the groove is used to accommodate the top of the part to be tightened, such as the end of the bolt O1 and the buffer pad O2. At this time, for the mounting portion 13, generally, the bottom surface of the groove is in contact with the top of the part to be tightened, so the bottom surface of the groove is the first surface S1.
[0068] In this embodiment, the surface of the limiting sleeve 2 that is away from the first end 11 of the rotating shaft 1 is the second surface S2, that is, the second surface S2 is the lower end surface of the limiting sleeve 2. Figure 7As shown, the lower end surface of the second surface S2 is located below the first surface S1 on the mounting portion 13. The distance L between the second surface S2 and the first surface S1 in the axial direction of the rotating shaft 1 is a set distance. In this embodiment, the limiting sleeve 2 can be set to be separable from the rotating shaft 1, and a plurality of limiting sleeves 2 of different specifications are configured, and the length of the cylinder of each limiting sleeve 2 is different. After the limiting sleeves 2 of different sizes are installed with the rotating shaft 1, the distance between the first surface S1 and the second surface S2 formed can cover an interval range.
[0069] When the tightening device in this embodiment tightens and assembles the parts to be tightened, the process includes:
[0070] First, a limit sleeve 2 of appropriate specifications is selected and installed on the rotating shaft 1 so that the distance between the first surface S1 and the second surface S2 on the tightening device obtained after assembly is a set distance, which matches the part to be tightened and the length of the tightened part required to be exposed relative to the target object in the expected tightening state.
[0071] Thereafter, the part to be tightened is mounted on the mounting portion 13 of the second end 12 of the rotating shaft 1, and the first end 11 of the rotating shaft 1 is connected to the rotation driving device. The above process is known to those skilled in the art and will not be described in detail.
[0072] After that, the part to be tightened is aligned with a specific position on the target object, and the rotary drive device is started; driven by the rotary drive device, the rotating shaft 1 rotates, and drives the part to be tightened to be screwed into the target object; for the tightening device including the limiting sleeve 2 and the rotating shaft 1, it moves downward in this process. In the above process, under normal circumstances (for example, the area on the target object corresponding to the part to be tightened and the tightening device is a plane), the lower end of the part to be tightened is located below the second surface S2, that is, the limiting sleeve 2 does not contact the target object.
[0073] Afterwards, as the part to be tightened is continuously screwed in, the distance between the limit sleeve 2 and the target object is continuously reduced, and the two finally come into contact. When the limit sleeve 2 comes into contact with the target object, the limit sleeve 2 and the rotating shaft 1 cannot continue to move downward and their positions are fixed. Since the distance between the first surface S1 and the second surface S2 is configured as a set distance, at this time, the part to be tightened reaches the expected tightening state, and the length of the exposed part of the part to be tightened relative to the target object meets the required length. In this case, the rotary drive device stops driving the rotating shaft 1 to continue rotating, and the tightening process ends.
[0074] In summary, in the present embodiment, the tightening device includes a rotating shaft 1 and a limiting sleeve 2. The limiting sleeve 2 can ensure that the distance between the second surface S2 on the limiting sleeve 2 and the first surface S1 on the mounting portion 13 in the axial direction of the rotating shaft 1 is a set distance. In this case, in the process of using the tightening device to tighten the part to be tightened, it is only necessary to confirm that the part to be tightened is screwed in to the required depth when the lower end surface of the limiting sleeve 2, i.e., the second surface S2, contacts the target object, and the part to be tightened reaches the expected tightening state, and the part to be tightened relative to the target object is also the required exposed length. After that, it is only necessary to control the rotating shaft 1 to stop rotating. The above process of tightening the part to be tightened to the expected tightening state is simple, convenient, and efficient, and the process of multiple tightening will have good standardization and consistency.
[0075] In one embodiment of the tightening device, the limiting sleeve 2 and the rotating shaft 1 are movably connected to each other so that the limiting sleeve 2 and the rotating shaft 1 can rotate relative to each other in the circumferential direction of the rotating shaft 1 .
[0076] In this embodiment, the limiting sleeve 2 and the rotating shaft 1 are movably connected, and the two can rotate relative to each other in the axial direction of the rotating shaft 1. In the process of tightening the part to be tightened, although the rotating shaft 1 continues to rotate, the limiting sleeve 2 may not rotate with it, and it may be in a fixed state, or although it rotates, the rotation speed is significantly slower than that of the rotating shaft 1 (in a natural state without external interference). In this way, the limiting sleeve 2 can be operated by the operator by hand. Before tightening the part to be tightened, the operator can better align the part to be tightened with a specific position on the target object by holding the limiting sleeve 2 by hand; during the tightening process, the operator can also better ensure the stability of the state between the part to be tightened and the target object by holding the limiting sleeve 2 by hand, thereby ensuring the stability of the tightening process, thereby achieving a good tightening effect and good reliability.
[0077] In one embodiment of the tightening device, the tightening device also includes a retaining frame 3, which is sleeved on the outer periphery of the rotating shaft 1; the retaining frame 3 is fixed relative to the rotating shaft 1 in the axial direction of the rotating shaft 1, fixed to the second end 12, and is respectively located on two opposite sides of the limiting sleeve 2 with the mounting portion 13; the limiting sleeve 2 is respectively provided with a first ball half groove 51 on both sides facing the retaining frame 3 and the mounting portion 13, and the mounting portion 13 and the retaining frame 3 are respectively provided with a second ball half groove 52, at least one of the first ball half groove 51 and the second ball half groove 52 is annular, and the first ball half groove 51 and the second ball half groove 52 are arranged corresponding to each other; the tightening device also includes two groups of balls 6; the two groups of balls 6 are respectively arranged in the space defined by the first ball half groove 51 of the limiting sleeve 2 and the second ball half groove 52 of the mounting portion 13, and in the space defined by the first ball half groove 51 of the limiting sleeve 2 and the second ball half groove 52 of the retaining frame 3.
[0078] In this embodiment, the retaining frame 3 and the mounting portion 13 are respectively arranged on both sides of the limiting sleeve 2, specifically on the upper side and the lower side. The retaining frame 3 and the mounting portion 13 can provide fixing and limiting functions for the limiting sleeve 2 from the upper side and the lower side respectively, so that the limiting sleeve 2 remains relatively fixed with the rotating shaft 1 in the axial direction of the rotating shaft 1, and the limiting sleeve 2 will not move along the axial direction of the rotating shaft 1. In addition, balls 6 and a first ball half groove 51 and a second ball half groove 52 for accommodating the balls 6 are respectively arranged between the retaining frame 3 and the limiting sleeve 2, and between the limiting sleeve 2 and the mounting portion 13. In this way, relative rotation can be achieved between the retaining frame 3 and the limiting sleeve 2, and between the limiting sleeve 2 and the mounting portion 13. The limiting sleeve 2 as a whole can rotate asynchronously relative to the rotating shaft 1 in the circumferential direction of the rotating shaft 1. When the rotating shaft 1 rotates to tighten the parts to be tightened, the limiting sleeve 2 may not rotate or rotate at a speed lower than that of the rotating shaft 1, thereby providing conditions and basis for the operator to hold the limiting sleeve 2 by hand.
[0079] In this embodiment, in order to facilitate the relative rotation between the limit sleeve 2 and the mounting portion 13, the relative rotation between the limit sleeve 2 and the retaining frame 3, and the relative rotation between the limit sleeve 2 and the shaft body of the rotating shaft 1 (specifically the part surrounded by the limit sleeve 2), the surfaces relative to each other in the above-mentioned structures are arranged to have gaps of corresponding sizes to avoid contact and friction, which is not conducive to relative rotation.
[0080] In one embodiment of the tightening device, the tightening device also includes a limit nut 4; the limit nut 4 is sleeved on the outer periphery of the rotating shaft 1 and is located on the side of the retaining frame 3 that is away from the limit sleeve 2; the limit nut 4 is threadedly engaged with the outer periphery of the rotating shaft 1 to threadably fix the retaining frame 3 on the rotating shaft 1.
[0081] In this embodiment, by providing a limiting nut 4 and threading it with the rotating shaft 1, the retainer 3 can be fastened to the rotating shaft 1. In the axial direction of the rotating shaft 1, the retainer 3 is fixed and will not move along the axial direction of the rotating shaft 1. In this case, the retainer 3 can provide a limiting effect on the limiting sleeve 2 above the limiting sleeve 2, so that the position of the limiting sleeve 2 relative to the rotating shaft 1 in the axial direction of the rotating shaft 1 is fixed.
[0082] In one embodiment of the tightening device, the second ball half groove 52 is an annular groove; the first ball half groove 51 is a single-point hemispherical groove, and the number of the first ball half grooves 51 is multiple and is distributed at intervals along the annular shape corresponding to the second ball half groove 52.
[0083] In this embodiment, each ball 6 is confined in the first ball half groove 51, and the force exerted on the ball 6 by the second ball half groove 52 when it contacts each ball 6 is converted into the rotation of the ball 6 itself, and is not transmitted or partially transmitted to the limiting sleeve 2, thereby achieving the limit sleeve 2 not rotating synchronously with the retaining frame 3 and the mounting part 13.
[0084] In an alternative embodiment of the tightening device, the first ball half groove 51 is an annular groove; the second ball half groove 52 is a single-point hemispherical groove, and the number of the second ball half grooves 52 is multiple and is distributed at intervals along the annular shape corresponding to the first ball half groove 51.
[0085] In this alternative embodiment, each ball 6 is confined in the second ball half groove 52, and each second ball half groove 52 drives the corresponding ball 6 to rotate synchronously with the rotation of the rotating shaft 1. The synchronous rotation is the revolution around the rotating shaft 1. During the revolution of the ball 6, the force generated by the contact between the ball and the first ball half groove 51 is fully or partially converted into the rotation of the ball 6. As for the limiting sleeve 2, it is not affected by the force or is only partially affected by the force, which is manifested as the limiting sleeve 2 does not rotate synchronously with the retaining frame 3 and the mounting portion 13.
[0086] In another alternative embodiment of the tightening device, the first ball half groove 51 and the second ball half groove 52 are both annular grooves.
[0087] In this alternative embodiment, multiple balls 6 are arranged in an annular space defined by a first ball half-groove 51 and a second ball half-groove 52. When the second ball half-groove 52 contacts each ball 6, the force exerted on the ball 6 is converted into the rotation of the ball 6 and its revolution around the rotating axis 1, while the first ball half-groove 51 in contact with the ball 6 is not affected by the force or is only partially affected by the force, which manifests as the limit sleeve 2 not rotating synchronously with the retaining frame 3 and the mounting portion 13.
[0088] In the aforementioned embodiment, when the first ball half groove 51 and the second ball half groove 52 are hemispherical grooves or annular grooves, their cross-sectional shapes can be standard semicircles, or they can be small semicircles (the angle of the arc is less than 180 degrees) or large semicircles (the angle of the arc is greater than 180 degrees), or they can be small semicircles at the same time.
[0089] In one embodiment of the tightening device, a lubricating oil injection hole 21 is provided on the limiting sleeve 2, and the lubricating oil injection hole 21 is connected to the second ball half groove 52 provided on the mounting portion 13, or is connected to the first ball half groove 51 provided on the limiting sleeve 2 and corresponding to the second ball half groove 52.
[0090] In this embodiment, by providing a lubricating oil injection hole 21, lubricating oil can be injected into the first ball half groove 51 and the second ball half groove 52 between the limiting sleeve 2 and the mounting portion 13, thereby making it easier to reduce the friction between the ball 6 and the first ball half groove 51 and the second ball half groove 52. This can better reduce the force exerted on the ball 6 from the second ball half groove 52, and better reduce the force transmitted from the ball 6 to the first ball half groove 51, which is more helpful to enhance the non-followability of the limiting sleeve 2 with respect to the rotation of the rotating shaft 1.
[0091] As for the ball 6 between the limiting sleeve 2 and the retaining frame 3, since there is a gap between the limiting sleeve 2 and the retaining frame 3, lubricating oil can be injected into the first roller half groove and the second roller half groove through the gap without providing a separate lubricating oil injection hole 21.
[0092] In an embodiment of the tightening device, the tightening device further comprises a magnet 14 , and the magnet 14 is disposed in the mounting portion 13 of the second end 12 of the rotating shaft 1 .
[0093] As described in the aforementioned embodiments, the parts to be tightened may be bolts O1, buffer pads O2, etc. Taking bolt O1 as an example, it is generally made of metal materials such as steel. In this embodiment, a magnet 14 is provided in the mounting portion 13, and the bolt O1 can be adsorbed and fixed in the mounting portion 13 by magnetic attraction. In this case, the mounting portion 13 can be specifically set to a shape that matches the end of the bolt O1 as the part to be tightened. As for buffer pads O2, etc., they are generally made of elastic materials such as rubber. Although the magnet 14 provided cannot adsorb and fix them, as described in the aforementioned embodiments, a groove is provided in the mounting portion 13, and the end of the buffer pad O2 can be fixed in the mounting portion 13 by interference fit.
[0094] In one embodiment of the tightening device, a mark 22 for visual identification is provided on the outer circumference of the limiting sleeve 2 in an area connected to the second surface S2.
[0095] In this embodiment, by setting the mark 22, it can be promptly known by visual identification when the second surface S2 on the limiting sleeve 2 is close to the target object and the two are in contact, and after knowing it, the rotation drive device can be promptly controlled to stop driving the rotating shaft 1 to rotate.
[0096] The mark 22 may be a color ring, a metal strip, a light strip, etc. The color ring, the metal strip, the light strip may be distinguished from other areas of the limit sleeve 2 and the target object in one or more aspects such as color, reflective shape, contrast, brightness, etc., and may be visually identified in a more eye-catching manner.
[0097] In one embodiment of the tightening device, the limiting sleeve 2 includes a movable portion, which can be extended and retracted along the axial direction of the rotating shaft 1, and the second surface S2 is located on the movable portion so that the set distance between the second surface S2 and the first surface S1 is adjustable.
[0098] In the aforementioned embodiment, if the types and specifications of the parts to be tightened are different, it is usually necessary to replace different limit sleeves 2 so that the distance between the first surface S1 and the second surface S2 on the tightening device matches the different parts to be tightened and their expected tightening states. The process of replacing the limit sleeve 2 is relatively complicated and tedious, and basically requires the entire tightening device to be disassembled and reinstalled.
[0099] In the present embodiment, the limiting sleeve 2 includes a movable portion, which can be extended and retracted along the axial direction of the rotating shaft 1, and the second surface S2 is arranged on the movable portion. In this way, when tightening parts of different types and specifications to be tightened, there is no need to replace the limiting sleeve 2, and only the extension and retraction range of the movable portion needs to be adjusted, thereby saving manpower and time, and completing the tightening operations of different parts to be tightened with higher efficiency.
[0100] In one embodiment of the tightening device, the movable portion includes the limiting sleeve 2 as a whole, and the limiting sleeve 2 is movably connected to the rotating shaft 1 along the circumference of the rotating shaft 1.
[0101] In this embodiment, the entire limiting sleeve 2 is a movable part, that is, in the axial direction of the rotating shaft 1, the limiting sleeve 2 and the rotating shaft 1 are movably connected. The limiting sleeve 2 can change its position in the axial direction of the rotating shaft 1, and achieve extension and contraction by changing the position, thereby achieving the increase or decrease of the distance between the first surface S1 and the second surface S2.
[0102] Specifically, the limiting sleeve 2 and the rotating shaft 1 may be connected by a thread, a sliding connection or a clamping connection (a plurality of clamping interfaces are arranged at intervals along the axial direction of the rotating shaft 1 ).
[0103] In one embodiment of the tightening device, the limiting sleeve 2 includes a fixed portion and a movable portion; the fixed portion is connected to the rotating shaft 1, and the movable portion is connected to the fixed portion and can move axially along the rotating shaft 1 relative to the fixed portion.
[0104] In this embodiment, the fixed portion of the limiting sleeve 2 is fixed to the rotating shaft 1 in the axial direction of the rotating shaft 1 (it is still movably connected in the circumferential direction of the rotating shaft 1 to achieve the non-following rotation of the rotating shaft 1 by the limiting sleeve 2, and the technical scheme described in the aforementioned embodiment is applicable), and the movable portion is connected to the fixed portion and can be moved relative to the fixed portion along the axial direction of the rotating shaft 1, so that the distance between the first surface S1 and the second surface S2 can be changed by moving the position of the movable portion to match the parts to be tightened of different types and specifications and their expected tightening states.
[0105] Specifically, the connection between the movable part and the fixed part can be a threaded connection, a sliding connection or a clamping connection (a plurality of clamping interfaces are arranged at intervals along the axial direction of the rotating shaft 1 ).
[0106] Taking the threaded connection as an example, the movable part can be, for example, a nut threaded on the lower end of the fixed part. In this case, the threaded connection between the nut as the movable part and the fixed part enables the two to be screwed in and out by rotating the thread, thereby changing the distance between the first surface S1 and the second surface S2 to match the different types and specifications of parts to be tightened and their expected tightening states.
[0107] In summary, the tightening device provided by the utility model includes a rotating shaft 1 and a limiting sleeve 2. Through the provided limiting sleeve 2, it can be ensured that the distance between the second surface S2 on the limiting sleeve 2 and the first surface S1 on the mounting portion 13 in the axial direction of the rotating shaft 1 is the set distance. In this case, in the process of using the tightening device to tighten the parts to be tightened, it is only necessary to confirm that the parts to be tightened are screwed in to the required depth when the lower end surface of the limiting sleeve 2, i.e., the second surface S2, contacts the target object, and the parts to be tightened reach the expected tightening state, and the exposed part of the parts to be tightened relative to the target object is also the required exposed length. After that, it is only necessary to control the rotating shaft 1 to stop rotating. The above process of tightening the parts to be tightened to the expected tightening state is simple, convenient, and efficient, and the multiple tightening processes will have good standardization and consistency.
[0108] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0109] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.
[0110] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by a person skilled in the art based on the present invention is within the protection scope of the present invention.
Claims
1. A tightening device, characterized in that: The tightening device comprises a rotating shaft and a limiting sleeve; The rotating shaft has a first end and a second end, the first end is used to connect with the rotation driving device, and the second end is provided with a mounting portion, the mounting portion is used to mount and fix the part to be tightened, and the surface of the mounting portion that contacts the top of the part to be tightened is the first surface; The limiting sleeve is connected to the second end of the rotating shaft; along the axial direction of the rotating shaft, the surface of the limiting sleeve that is away from the first end of the rotating shaft is the second surface, the second surface is located on the side of the first surface that is away from the first end of the rotating shaft, and there is a set distance between the second surface and the first surface.
2. The tightening device according to claim 1, characterized in that: The limiting sleeve and the rotating shaft are movably connected to each other so that the limiting sleeve and the rotating shaft can rotate relative to each other in the circumferential direction of the rotating shaft.
3. The tightening device according to claim 2, characterized in that: The tightening device further comprises a retaining frame, which is sleeved on the outer periphery of the rotating shaft; the retaining frame is fixed relative to the rotating shaft in the axial direction of the rotating shaft, fixed to the second end, and is located at two opposite sides of the limiting sleeve with the mounting portion respectively; The limiting sleeve is provided with first ball half grooves on both sides facing the retaining frame and the mounting portion, respectively, and the mounting portion and the retaining frame are provided with second ball half grooves, respectively, at least one of the first ball half groove and the second ball half groove is annular, and the first ball half groove and the second ball half groove are provided corresponding to each other; The tightening device also includes two groups of balls; the two groups of balls are respectively arranged in the space defined by the first ball half groove of the limiting sleeve and the second ball half groove of the mounting portion, and in the space defined by the first ball half groove of the limiting sleeve and the second ball half groove of the retaining frame.
4. The tightening device according to claim 3, characterized in that: The tightening device also includes a limiting nut; the limiting nut is sleeved on the outer circumference of the rotating shaft and is located on the side of the retaining frame facing away from the limiting sleeve; the limiting nut is threadedly engaged with the outer circumference of the rotating shaft to threadably fix the retaining frame on the rotating shaft.
5. The tightening device according to claim 3, characterized in that: The second ball rolling half groove is an annular groove; the first ball rolling half groove is a single-point hemispherical groove, and the number of the first ball rolling half grooves is multiple and is distributed at intervals along the annular ring corresponding to the second ball rolling half groove; or The first ball rolling half groove is an annular groove; the second ball rolling half groove is a single-point hemispherical groove, and the number of the second ball rolling half grooves is multiple and is distributed at intervals along the annular shape corresponding to the first ball rolling half groove; or The first ball rolling half groove and the second ball rolling half groove are both annular grooves.
6. The tightening device according to claim 3, characterized in that: The limiting sleeve is provided with a lubricating oil injection hole, and the lubricating oil injection hole is connected to the second ball half groove provided on the mounting portion, or is connected to the first ball half groove provided on the limiting sleeve corresponding to the second ball half groove.
7. The tightening device according to claim 1, characterized in that: The tightening device further includes a magnet, which is disposed in a mounting portion of the second end of the rotating shaft.
8. The tightening device according to claim 1, characterized in that: A mark for visual identification is provided in an area on the outer circumference of the limiting sleeve that is in contact with the second surface.
9. The tightening device according to claim 8, characterized in that: The mark is a color ring or a metal strip or a light strip.
10. The tightening device according to claim 1, characterized in that: The limiting sleeve comprises a movable portion, the movable portion can be extended and retracted along the axial direction of the rotating shaft, and the second surface is located on the movable portion, so that the set distance between the second surface and the first surface is adjustable.
11. The tightening device according to claim 10, characterized in that: The movable part includes the limiting sleeve as a whole, and the limiting sleeve is movably connected to the rotating shaft along the circumference of the rotating shaft.
12. The tightening device according to claim 10, characterized in that: The limiting sleeve includes a fixed portion and a movable portion; the fixed portion is connected to the rotating shaft, and the movable portion is connected to the fixed portion and can move relative to the fixed portion along the axial direction of the rotating shaft.
13. The tightening device according to claim 12, characterized in that: The movable part and the fixed part are connected by threads, and screwing in and out is achieved by rotating the threads.