Sleeve special for double-end stud
By designing a special sleeve for double-head studs containing floating pins and coil springs, the problem of double-head studs being retracted from the box when they are retracted is solved, ensuring that the preloading torque between the double-head studs and the box is guaranteed, and successful installation is achieved.
Patent Information
- Application Number
- CN202421618508.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-09
AI Technical Summary
When the existing double-head stud tightening tool is retracted, the double-head stud tightening torque at the sleeve end is greater than the box end torque, causing the double-head stud to fall back from the box end, resulting in installation failure and the tightening torque cannot be guaranteed.
A special sleeve for double-head studs is designed, including the upper sleeve, the lower sleeve, the floating pin and the elastic member. Through the cooperation of the floating pin and the coil spring, the preload force between the double-head studs and the box is always greater than the preload force between the sleeve and the double-head studs when retracted, and prevent the double-head studs from retracting.
Effectively prevent the double-headed stud from retracting from the box when the sleeve is retracted, ensuring that the preloading torque between the double-headed stud and the box is guaranteed and ensuring successful installation.
Smart Images
Figure CN222779489U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tooling equipment, in particular to a special sleeve for stud bolts. Background Art
[0002] Common stud tightening tools include a sleeve with a threaded hole and a limiting steel ball above the threaded hole. When tightening, the stud is screwed into the sleeve thread and contacts the limiting steel ball. The friction between the threaded pair, the friction of the limiting steel ball, and the pressure between the threads drive the stud to rotate and screw into the threaded hole of the box. When the connection between the stud and the box reaches the set torque, the sleeve is retracted, and the connection between the sleeve and the stud is withdrawn to complete the assembly of the stud and the box. In actual operation, when the sleeve is retracted, the tightening torque at the sleeve end is greater than the torque at the box end, causing the stud to retract from the box end, resulting in failure of the stud installation and the inability to guarantee the tightening torque between the stud and the box end. Utility Model Content
[0003] In view of the above-mentioned deficiencies, the technical problem to be solved by the present invention is to provide a special sleeve for studs, which will not cause the studs to retreat from the box body when the sleeve retreats.
[0004] In order to solve the above technical problems, the technical solution of the utility model is:
[0005] A special sleeve for a double-ended stud, comprising: an upper sleeve, a lower sleeve, a floating pin and an elastic member, the upper sleeve being provided with a wrench connection hole, the upper sleeve and the lower sleeve being threadedly connected, the upper sleeve being provided with an upper limit block, the lower sleeve being provided with a lower limit block cooperating with the upper limit block, the floating pin sliding in the lower sleeve, the elastic member being provided in the lower sleeve and abutting between the upper sleeve and the floating pin, and the lower sleeve being provided with an internal threaded hole for connecting to the double-ended stud.
[0006] Preferably, the floating pin is provided with a limiting boss protruding in the radial direction, the lower sleeve is provided with a stepped hole with an upper end hole diameter larger than a lower end hole diameter, and the limiting boss is adapted to the step of the stepped hole.
[0007] Preferably, the elastic member abuts against the limiting boss.
[0008] Preferably, the floating pin includes a sleeve column and a sliding column, the sleeve column and the sliding column are respectively located on both sides of the limiting boss, the elastic member is sleeved on the sleeve column, and the sliding column is slidably connected to the lower end hole of the stepped hole.
[0009] Preferably, the internal threaded hole is provided in the lower end hole of the stepped hole.
[0010] Preferably, the upper limit block and the lower limit block are circumferentially spaced 180° apart.
[0011] Preferably, clamping holes are respectively provided on two opposite sides of the wrench connecting hole.
[0012] Preferably, the wrench connecting hole is a square hole.
[0013] Preferably, the elastic member is a coil spring.
[0014] After adopting the above technical solution, the beneficial effects of the utility model are:
[0015] When the stud is installed on the box body, the pre-tightening force between the stud and the box body is equal to the pre-tightening force between the stud and the lower sleeve. Part of the pre-tightening force between the stud and the lower sleeve comes from the friction force of the threaded pair between the lower sleeve and the stud, and the other part comes from the pressure of the coil spring and the upper sleeve on the floating pin, which causes the friction force between the floating pin and the stud. When the upper sleeve is rotated in the opposite direction, the pressure of the upper sleeve on the floating pin disappears, and the elastic force of the coil spring on the floating pin gradually decreases, so that the pre-tightening force between the stud and the lower sleeve is less than the pre-tightening force between the stud and the box body, thereby ensuring that the stud will not withdraw from the box body when the sleeve rotates in the opposite direction, and the pre-tightening force between the stud and the box body is also guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a structural diagram of an embodiment of a special sleeve for stud bolts of the utility model;
[0017] Figure 2 This is a schematic cross-sectional view of an embodiment of a special sleeve for stud bolts of the utility model;
[0018] Figure 3 It is a structural diagram of the upper limit block and the lower limit block;
[0019] In the figure: 1. Upper sleeve; 11. Wrench connecting hole; 12. Upper limit block; 13. Clamping hole; 2. Lower sleeve; 21. Lower limit block; 22. Internal threaded hole; 3. Floating pin; 31. Limiting boss; 32. Socket column; 33. Sliding column; 4. Coil spring. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solutions and advantages of 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.
[0021] like Figure 1 and Figure 2As shown together, a special socket for stud bolts includes: an upper sleeve 1, a lower sleeve 2, a floating pin 3, and an elastic member. The upper sleeve 1 is provided with a wrench connection hole 11. The upper sleeve 1 and the lower sleeve 2 are threadedly connected. The upper sleeve 1 is provided with an upper limit block 12, and the lower sleeve 2 is provided with a lower limit block 21 that cooperates with the upper limit block 12. The floating pin 3 slides within the lower sleeve 2. The elastic member is provided within the lower sleeve 2 and abuts between the upper sleeve 1 and the floating pin 3. The lower sleeve 2 is provided with an internal threaded hole 22 for connecting to the stud bolt. The elastic member is preferably a coil spring 4, a rubber spring, etc.
[0022] The working principle and working process of this utility model are as follows:
[0023] S1. Screw the studs into the threaded holes of the box in advance;
[0024] S2. Rotate the lower sleeve 2 by hand to make the lower sleeve 2 threadedly connected to the stud;
[0025] S3, insert an automatic wrench such as a pneumatic wrench or an electric wrench into the wrench connection hole 11, and connect the automatic wrench to the upper sleeve 1;
[0026] S4, start the automatic wrench, the automatic wrench drives the upper sleeve 1 to rotate, so that the upper limit block 12 contacts the lower limit block 21, the upper sleeve 1 drives the lower sleeve 2 to rotate synchronously through the two limit blocks, the studs are continuously screwed into the lower sleeve 2, when the studs contact the floating pin 3, the coil spring 4 is compressed, the lower sleeve 2 continues to rotate, the coil spring 4 is further compressed, so that the floating pin 3 contacts the upper sleeve 1, at this time, the elastic force of the coil spring 4 and the pressure of the upper sleeve 1 act together on the floating pin 3, so that the lower sleeve 2 and the studs contact A pre-tightening force is generated between the studs (part of the pre-tightening force comes from the friction force of the threaded pair between the lower sleeve 2 and the stud, and the other part of the pre-tightening force comes from the friction force between the floating pin 3 and the stud due to the pressure of the coil spring 4 and the upper sleeve 1 on the floating pin). Under the action of the pre-tightening force, the lower sleeve 2 drives the stud to rotate synchronously, so that the stud is screwed into the threaded hole on the box until the stud stops rotating (the pre-tightening force between the lower end of the stud and the box is equal to the pre-tightening force on the upper end of the stud), and the stud is installed in place;
[0027] S5. Make the automatic wrench rotate in the opposite direction, the upper sleeve 1 rotates in the opposite direction, the upper limit block 12 and the lower limit block 21 separate, the upper sleeve 1 and the floating pin 3 separate first, the pressure of the upper sleeve 1 on the floating pin 3 disappears, the upper sleeve 1 continues to rotate, the upper limit block 12 and the lower limit block 21 contact, the upper sleeve 1 drives the lower sleeve 2 to rotate in the opposite direction through the cooperation of the two limit blocks, the elastic force of the coil spring 4 is gradually released, so that the pre-tightening force between the lower sleeve 2 and the stud is less than the pre-tightening force between the stud and the box body, which will not cause the stud to withdraw from the box body, and continue to rotate the lower sleeve 2 in the opposite direction until the lower sleeve 2 is separated from the stud.
[0028] In order to prevent the floating pin 3 from falling out of the lower sleeve 2, the floating pin 3 is provided with a radially protruding limiting boss 31. The lower sleeve 2 is provided with a stepped hole with an upper end hole diameter larger than the lower end hole diameter. The limiting boss 31 is adapted to the step of the stepped hole. The limiting boss 31 is blocked by the step and the floating pin 3 cannot fall out.
[0029] The limiting boss 31 also serves as a spring seat, and the coil spring 4 rests against the limiting boss 31 .
[0030] The floating pin 3 includes a sleeve column 32 and a sliding column 33, which are respectively located on both sides of the limiting boss 31. The coil spring 4 is sleeved on the sleeve column 32 to prevent the coil spring 4 from bending and ensure the service life of the coil spring 4. The sliding column 33 is slidably connected to the lower end hole of the stepped hole to guide the floating pin 3.
[0031] The internal threaded hole 22 is provided in the lower end hole of the stepped hole.
[0032] like Figure 3 As shown, preferably, along the circumferential direction, the upper limit block 12 and the lower limit block 21 are spaced 180° apart.
[0033] To prevent the automatic wrench from falling out of the wrench connecting hole 11, clamping holes 13 are respectively provided on opposite sides of the wrench connecting hole 11. When the automatic wrench is inserted into the wrench connecting hole 11, the steel balls on the automatic wrench are clamped into the clamping holes 13 to prevent the automatic wrench from falling out.
[0034] The shape of the wrench connection hole 11 depends on the shape of the automatic wrench. Preferably, in the illustrated embodiment, the wrench connection hole 11 is a square hole.
[0035] The above are examples of the best embodiments of the present invention. Any parts not described in detail are common knowledge of those skilled in the art. The scope of protection of the present invention is based on the content of the claims. Any equivalent transformation based on the technical teachings of the present invention is also within the scope of protection of the present invention.
Claims
1. A special sleeve for studs, characterized in that: include: An upper sleeve, a lower sleeve, a floating pin and an elastic member, the upper sleeve is provided with a wrench connecting hole, the upper sleeve and the lower sleeve are threadedly connected, the upper sleeve is provided with an upper limit block, the lower sleeve is provided with a lower limit block cooperating with the upper limit block, the floating pin slides in the lower sleeve, the elastic member is arranged in the lower sleeve and abuts between the upper sleeve and the floating pin, and the lower sleeve is provided with an internal threaded hole for connecting with a stud.
2. The special sleeve for stud bolts as claimed in claim 1, characterized in that: The floating pin is provided with a limiting boss protruding in the radial direction, and the lower sleeve is provided with a stepped hole with an upper end hole diameter larger than a lower end hole diameter, and the limiting boss is adapted to the step of the stepped hole.
3. The special sleeve for stud bolts as claimed in claim 2, characterized in that: The elastic member abuts against the limiting boss.
4. The special sleeve for stud bolts as claimed in claim 2, characterized in that: The floating pin includes a sleeve column and a sliding column, the sleeve column and the sliding column are respectively located on both sides of the limiting boss, the elastic member is sleeved on the sleeve column, and the sliding column is slidably connected to the lower end hole of the stepped hole.
5. The special sleeve for stud bolts as claimed in claim 2, characterized in that: The internal threaded hole is arranged in the lower end hole of the stepped hole.
6. The special sleeve for stud bolts according to claim 1, characterized in that: The upper limit block and the lower limit block are circumferentially spaced 180° apart.
7. The special sleeve for stud bolts as claimed in claim 1, characterized in that: Clamping holes are respectively arranged on two opposite sides of the wrench connecting hole.
8. The special sleeve for stud bolts as claimed in claim 1, characterized in that: The wrench connecting hole is a square hole.
9. The special sleeve for stud bolts according to claim 1, characterized in that: The elastic member is a coil spring.