A double-end stud sleeve

Abstract

The application discloses a double-end stud sleeve, which comprises a top rod, a connecting rod, a fixing sleeve and a threaded plate, the top rod is connected with the connecting rod, the fixing sleeve is arranged on the connecting rod, the threaded plate is connected to the end of the fixing sleeve far from the top rod, a first threaded hole for connecting with a double-end stud is arranged on the threaded plate, a first limiting hole is arranged on the end of the threaded plate close to the connecting rod, a clamping structure is slidably connected in the first limiting hole, the first limiting hole is in communication with the first threaded hole, and the connecting rod is connected with the top rod through an unclogging mechanism. The double-end stud sleeve guarantees the standard of the connecting torque of the double-end stud, greatly reduces the rework rate of the double-end stud tightening, and improves the assembly efficiency of the double-end stud.

Description

Technical Field

[0001] This invention relates to the field of disassembly and assembly tools, and in particular to a double-ended stud sleeve. Background Technology

[0002] Double-ended studs, also known as double-ended bolts, are threaded connectors at both ends and are widely used in machinery, bridges, automobiles, motorcycles, boiler steel structures, cranes, large-span steel structures, and large buildings.

[0003] Currently, double-ended studs are installed using pneumatic or electric tightening tools paired with double-ended stud sleeves. Existing pre-made double-ended stud sleeves are one-piece sleeves. During installation, one end of the sleeve is fixed to the pneumatic or electric tool, and the other end is threaded to the stud. Torque is applied to the sleeve using the pneumatic or electric tool to tighten the stud. However, when removing the sleeve from the end of the stud after tightening, the tightened stud often comes loose or unscrews, resulting in insufficient torque and requiring repeated tightening, thus affecting assembly efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a double-ended stud sleeve, which avoids unscrewing or loosening the fastened double-ended studs together, ensures that the connection torque of the double-ended studs meets the standard, greatly reduces the rework rate of tightening double-ended studs, and improves the assembly efficiency of double-ended studs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A double-ended stud sleeve includes a push rod, a connecting rod, a fixed sleeve, and a threaded plate. The push rod is connected to the connecting rod, the fixed sleeve is fixedly sleeved on the connecting rod, and the threaded plate is connected to the end of the fixed sleeve away from the push rod.

[0007] The threaded plate is provided with a first threaded hole for connection with a double-ended stud; the end of the threaded plate near the connecting rod is provided with a first limiting hole, and a clamping structure is slidably connected in the first limiting hole, and the first limiting hole is connected to the first threaded hole.

[0008] The connecting rod and the top rod are connected by an unlocking mechanism.

[0009] Optionally, the clamping structure is a limiting steel ball;

[0010] The end of the connecting rod near the threaded plate is provided with a second limiting hole, which is coaxial with the first limiting hole.

[0011] The diameter of the first limiting hole is larger than the diameter of the limiting steel ball, and the diameter of the limiting steel ball is larger than the diameter of the second limiting hole.

[0012] Optionally, the length of the first limiting hole is less than the diameter of the limiting steel ball, but greater than the radius of the limiting steel ball;

[0013] The diameter of the limiting steel ball is larger than the minor diameter of the first threaded hole.

[0014] Optionally, the top rod includes a rod head and a rod body connected together, the rod body being inserted into the connecting rod;

[0015] A thrust bearing is provided between the top rod and the connecting rod, and the thrust bearing is sleeved on the rod body of the top rod.

[0016] Optionally, the end of the rod head of the top rod is provided with a square hole for connecting with a tightening tool;

[0017] The outer side of the rod head of the push rod is provided with an annular rubber groove, and a first pin hole is provided in the rubber groove to connect with the square hole. The push rod is connected to the tightening tool through a cylindrical pin connected in the first pin hole.

[0018] Optionally, a rubber ring for limiting the position of the cylindrical pin is fitted inside the rubber ring groove.

[0019] Optionally, the connecting rod includes a first rod segment, a second rod segment, and a third rod segment integrally arranged in sequence. The end of the first rod segment is provided with a first connecting hole, which is used to be inserted into the top rod.

[0020] The second rod segment and the third rod segment are sleeved inside the fixed sleeve, and the second rod segment is fixedly connected to the fixed sleeve.

[0021] Optionally, a torsion spring is provided between the first rod segment and the fixed sleeve, and the torsion spring is sleeved on the second rod segment;

[0022] One end of the torsion spring is fixedly connected to the end of the first rod segment, and the other end of the torsion spring is fixedly connected to the end of the fixing sleeve.

[0023] Optionally, the unlocking mechanism includes a first connecting pin and a first pin connecting through hole, and the push rod and the connecting rod are connected by the first connecting pin; the connecting rod is provided with a first pin connecting through hole at the position for connecting with the push rod, and the length of the first pin connecting through hole along the circumference of the connecting rod is greater than the diameter of the first connecting pin;

[0024] The first connecting pin is threaded onto the top rod, and the end of the first connecting pin is connected to the first pin connecting through hole.

[0025] Optionally, the connecting rod and the fixing sleeve are connected by a second connecting pin;

[0026] The fixing sleeve is provided with a second pin connection through hole at the position for connecting with the connecting rod, and the length of the second pin connection through hole along the circumference of the fixing sleeve is greater than the diameter of the second connecting pin.

[0027] The second connecting pin is threaded onto the connecting rod.

[0028] As can be seen from the above technical solution, the double-ended stud sleeve provided by the present invention, when tightening the double-ended stud, the clamping structure presses against one end of the connecting rod, thereby fixing the force-applying end of the double-ended stud. The push rod, driven by the tightening tool, drives the connecting rod to rotate, which in turn drives the threaded plate to rotate. The threaded plate then drives the double-ended stud, which is fixed in the first threaded hole, to rotate, thus tightening the double-ended stud. When disassembling the sleeve, the tightening tool rotates in the opposite direction, causing the push rod to rotate. The push rod then drives the unclamping mechanism to rotate. The unclamping mechanism strikes the connecting rod, causing it to vibrate and quickly disengage from the clamping structure. The connecting rod then drives the fixed sleeve to rotate, causing the threaded plate to disengage from the double-ended stud.

[0029] The double-ended stud sleeve of the present invention uses a clamping structure to tighten the force-applying end of the double-ended stud for easy fastening. By releasing the clamping force of the clamping structure, the fastening of the force-applying end of the double-ended stud is released. Thus, only the friction force to overcome the threaded connection is needed to remove the threaded plate from the threaded end of the double-ended stud. This force is very small compared to the force applied to the double-ended stud, so there will be no situation where the fastened double-ended stud is unscrewed or loosened. This ensures that the connection torque of the double-ended stud meets the standard, greatly reduces the rework rate of tightening the double-ended stud, and improves the assembly efficiency of the double-ended stud. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the double-ended stud sleeve provided in an embodiment of the present invention;

[0032] Figure 2 A cross-sectional view of the double-ended stud sleeve at point AA provided in an embodiment of the present invention;

[0033] Figure 3This is a structural schematic diagram of a top rod at one angle provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the axial cross-sectional structure of the push rod provided in an embodiment of the present invention;

[0035] Figure 5 A schematic diagram showing another angle of the top rod provided in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the connecting rod provided in an embodiment of the present invention;

[0037] Figure 7 A cross-sectional view of the BB section of the connecting rod provided in an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of the threaded plate provided in an embodiment of the present invention;

[0039] Figure 9 A cross-sectional view of the threaded plate at the CC position provided in an embodiment of the present invention;

[0040] Figure 10 This is a schematic diagram of the structure of the fixing sleeve provided in an embodiment of the present invention;

[0041] Figure 11 This is a cross-sectional view of the DD portion of the fixing sleeve provided in an embodiment of the present invention;

[0042] Figure 12 This is a schematic diagram of the axial cross-sectional structure of the fixing sleeve provided in an embodiment of the present invention.

[0043] in:

[0044] 1. Top rod,

[0045] 101. Rod head; 102. Rod body; 103. Rubber ring groove; 104. First pin hole; 105. Second threaded hole; 106. Square hole.

[0046] 2. Thrust bearing,

[0047] 3. Connecting rod,

[0048] 301. First rod segment; 302. Second rod segment; 303. Third rod segment; 304. First pin connection through hole; 305. Third threaded hole; 306. Second limiting hole; 307. First connecting hole.

[0049] 4. First connecting pin

[0050] 5. Torsion spring,

[0051] 6. Second connecting pin

[0052] 7. Fixing sleeve,

[0053] 701. Second pin connection through hole; 702. First sleeve section; 703. Second sleeve section; 704. Limiting groove; 705. Fourth threaded hole.

[0054] 8. Threaded plate,

[0055] 801. First threaded hole; 802. First limiting hole; 803. Bolt connection through hole; 804. Limiting boss.

[0056] 9. Connecting bolts,

[0057] 10. Limiting steel ball. Detailed Implementation

[0058] This invention discloses a double-ended stud sleeve, which avoids unscrewing or loosening the fastened double-ended studs together, ensures that the connection torque of the double-ended studs meets the standard, greatly reduces the rework rate of tightening double-ended studs, and improves the assembly efficiency of double-ended studs.

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] See Figures 1 to 12 The double-ended stud sleeve of the present invention includes a push rod 1, a connecting rod 3, a fixing sleeve 7, and a threaded plate 8. The push rod 1 is connected to the connecting rod 3, and the fixing sleeve 7 is fixedly sleeved on the end of the connecting rod 3 away from the push rod 1. The threaded plate 8 is connected to the end of the fixing sleeve 7 away from the push rod 1.

[0061] The threaded plate 8 is provided with a first threaded hole 801 for connection with a double-ended stud, such as Figure 8 and Figure 9 As shown, a first limiting hole 802 is provided at the end of the threaded plate 801 near the connecting rod 3. A clamping structure is slidably connected in the first limiting hole 802, and the first limiting hole 802 communicates with the first threaded hole 801. The connecting rod 3 and the top rod 1 are connected by an unlocking mechanism, which is used to release the clamping structure that is pressed against the end of the connecting rod 3, thereby releasing the end limit of the double-ended stud.

[0062] One end of the push rod 1 is connected to a tightening tool, and the other end is connected to the connecting rod 3. The end of the connecting rod 3 that passes through the fixing sleeve 7 is positioned near the first limiting hole 802, thereby facilitating the clamping structure to clamp against the connecting rod 3. When the end of the double-ended stud connected in the first threaded hole 801 is pressed against the end of the connecting rod 3, the clamping structure presses and positions the end of the double-ended stud connected in the threaded plate 8, fixing this end of the double-ended stud and facilitating the tightening of the other end of the double-ended stud onto the structure to be connected.

[0063] In this invention, when tightening the double-ended stud sleeve, the clamping structure presses against one end of the connecting rod 3, fixing the force-applying end of the double-ended stud. The push rod 1, driven by the tightening tool, rotates the connecting rod 3, which in turn rotates the threaded plate 8. The threaded plate 8 then rotates the double-ended stud, which is fixed within the first threaded hole 801, thus tightening the double-ended stud. When disassembling the sleeve, the tightening tool rotates in the opposite direction, causing the push rod 1 to rotate. The push rod 1 then rotates the unclamping mechanism, which strikes the connecting rod 3, causing it to vibrate and quickly disengage from the clamping structure. The connecting rod 3 then rotates the fixing sleeve 7, disengaging the threaded plate 8 from the double-ended stud.

[0064] The double-ended stud sleeve of the present invention uses a clamping structure to tighten the force-applying end of the double-ended stud for easy fastening. By releasing the clamping force of the clamping structure, the fastening of the force-applying end of the double-ended stud is released. Thus, only the friction force to overcome the threaded connection is needed to remove the threaded plate 8 from the threaded end of the double-ended stud. This force is very small compared to the force applied to the double-ended stud, so there will be no situation where the fastened double-ended stud is unscrewed or loosened. This ensures that the connection torque of the double-ended stud meets the standard, greatly reduces the rework rate of tightening the double-ended stud, and improves the assembly efficiency of the double-ended stud.

[0065] To improve the efficiency of clamping and declamping, the clamping structure is preferably a limiting steel ball 10, as the spherical structure facilitates clamping and declamping under vibration. Furthermore, a second limiting hole 306 is provided at the end of the connecting rod 3 near the threaded plate 8, and the second limiting hole 306 is coaxially arranged with the first limiting hole 802. To facilitate the installation of the limiting steel ball 10, the diameter of the first limiting hole 802 is slightly larger than the diameter of the limiting steel ball 10. To facilitate the limiting of both ends of the limiting steel ball 10, the diameter of the limiting steel ball 10 is larger than the diameter of the second limiting hole 306, and the diameter of the limiting steel ball 10 is also larger than the minor diameter of the first threaded hole 801, preventing the limiting steel ball 10 from rolling out of the first threaded hole 801.

[0066] Specifically, such as Figure 2As shown, the length of the first limiting hole 802 is less than the diameter of the limiting steel ball 10 but greater than the radius of the limiting steel ball 10, so that the limiting steel ball 10 has a certain range of movement between the second limiting hole 306 and the first limiting hole 802, while avoiding a large range of movement.

[0067] like Figures 3 to 5 As shown, the push rod 1 includes a rod head 101 and a rod body 102 connected together. The rod body 102 is inserted into the connecting rod 3, and the rod head 101 is connected to the tightening tool. To reduce the friction between the contact surfaces of the push rod 1 and the connecting rod 3, so that excessive friction at this point may affect the release of the locking ball 10, a thrust bearing 2 is provided between the push rod 1 and the connecting rod 3. The thrust bearing 2 is sleeved on the rod body 102 of the push rod 1. The thrust bearing 2 is a thrust ball bearing.

[0068] To facilitate the connection of the tightening tool, the end of the rod head 101 of the push rod 1 is provided with a square hole 106 for connection with the tightening tool. The square hole 106 is used to insert the square head of the tightening tool. The outer surface of the rod head 101 of the push rod 1 is provided with an annular rubber groove 103. The rubber groove 103 is provided with a first pin hole 104 that connects to the square hole 106. The push rod 1 is connected to the tightening tool through a cylindrical pin connected in the first pin hole 104, thereby positioning the tightening tool. To prevent the cylindrical pin from falling out of the first pin hole 104, a rubber ring (not shown in the figure) is fitted inside the rubber groove 103 to limit the cylindrical pin, thereby restricting the cylindrical pin within the first pin hole 104. After the cylindrical pin is inserted into the first pin hole 104, it is connected to the tightening tool.

[0069] To facilitate connection with the connecting rod 3, a second threaded hole 105 is provided on the rod body 102. The second threaded hole 105 is a threaded through hole. The connecting rod 3 is connected to the top rod 1 through a connector connected in the second threaded hole 105.

[0070] like Figure 6 and Figure 7 As shown, the connecting rod 3 includes a first rod segment 301, a second rod segment 302, and a third rod segment 303 integrally arranged in sequence. The end of the first rod segment 301 is provided with a first connecting hole 307, which is a blind hole used for insertion into the end of the rod body 102 of the top rod 1. To achieve a reliable connection between the top rod 1 and the connecting rod 3, the first rod segment 301 is connected to the insertion section of the rod body 102 via a first connecting pin 4.

[0071] Furthermore, the unlocking mechanism includes a first connecting pin 4 and a first pin connecting through hole 304. The push rod 1 and the connecting rod 3 are connected by the first connecting pin 4. The connecting rod 3 is provided with the first pin connecting through hole 304 at the position where it connects with the push rod 1. The length of the first pin connecting through hole 304 along the circumference of the connecting rod 3 is greater than the diameter of the first connecting pin 4, so that when the tightening tool rotates in the reverse direction (when the sleeve is removed) and drives the push rod 1 to rotate, the push rod 1 drives the first connecting pin 4 to rotate and strike the inner wall of the other side of the first pin connecting through hole 304, causing the connecting rod 3 to vibrate and quickly disengage from the limiting steel ball 10. The connecting rod 3 drives the fixing sleeve 7 to rotate, causing the threaded plate 8 to disengage from the double-ended stud. It can be understood that when the tightening tool tightens the double-ended stud, the first connecting pin 4 presses against the first side wall of the first pin connecting through hole 304, and when the tightening tool removes the sleeve, the first connecting pin 4 presses against the second side wall of the first pin connecting through hole 304. The first side wall and the second side wall are arranged opposite to each other.

[0072] Specifically, such as Figure 7 As shown, there are two first pin connection through holes 304, which are symmetrically arranged about the axis of the connecting rod 3. The rod body 102 of the push rod 1 is provided with a second threaded hole 105. The middle part of the first connecting pin 4 is threaded into the second threaded hole 105, and the end of the first connecting pin 4 is connected into the first pin connection through hole 304.

[0073] In one embodiment, such as Figure 8 and Figure 9 As shown, the threaded plate 8 is provided with a first threaded hole 801 and a first limiting hole 802, which are coaxially arranged. The threaded plate 8 is also provided with a bolt connection through hole 803, through which the threaded plate 8 is connected to the fixing sleeve 7 by a connecting bolt 9 connected to the bolt connection through hole 803. A limiting boss 804 is provided at the end of the threaded plate 8 near the fixing sleeve 7, and the limiting boss 804 is arranged around the first limiting hole 802. A limiting groove 704 is provided at the end of the fixing sleeve 7 near the threaded plate 8, corresponding to the limiting boss 804. The limiting boss 804 is inserted into the limiting groove 704, thereby achieving coaxiality between the threaded plate 8 and the fixing sleeve 7 after installation, preventing misalignment of the threaded plate 8 during assembly, and avoiding affecting the limiting effect of the limiting steel ball 10. The end of the fixed sleeve 7 near the threaded plate 8 is provided with a fourth threaded hole 705. The fourth threaded hole 705 is provided in correspondence with the bolt connection through hole 803. The connecting bolt 9 passes through the bolt connection through hole 803 and is connected in the fourth threaded hole 705.

[0074] In this design, the second segment 302 and the third segment 303 of the connecting rod 3 are fitted into the fixing sleeve 7. For ease of fitting onto the connecting rod 3, as shown... Figures 10 to 12As shown, the fixing sleeve 7 includes a first sleeve segment 702 and a second sleeve segment 703 connected together. The first sleeve segment 702 is fitted outside the second rod segment 302, and the second sleeve segment 703 is fitted outside the third rod segment 303. A third threaded hole 305 is provided on the second rod segment 302, and a second pin connecting through hole 701 is provided on the fixing sleeve 7 at a position corresponding to the third threaded hole 305. The second pin connecting through hole 701 is correspondingly positioned to the third threaded hole 305. The circumferential length of the second pin connecting through hole 701 of the fixing sleeve 7 is greater than the diameter of the first connecting pin 4. The connecting rod 3 is connected to the fixing sleeve 7 via a second connecting pin 6. Specifically, the middle part of the second connecting pin 6 is threaded into the third threaded hole 305, and both ends are located within the second pin connecting through holes 701.

[0075] To ensure the connecting rod 3 automatically resets after tightening the double-ended stud, a torsion spring 5 is installed between the first rod segment 301 and the fixing sleeve 7, with the torsion spring 5 fitted onto the second rod segment 302. One end of the torsion spring 5 is fixedly connected to the end of the first rod segment 301, and the other end is fixedly connected to the end of the fixing sleeve 7. The fixing sleeve 7 has a torsion spring hole at the end where the torsion spring 5 is connected. The torsion spring 5 has no more than two turns to avoid excessive restoring force affecting the locking of the limiting steel ball 10.

[0076] The fixing sleeve 7 connects to a threaded plate with first threaded holes 801 of different sizes, enabling the assembly of double-ended studs with different thread diameters. Understandably, different sizes of the first threaded holes 801 correspond to different sizes of limiting steel balls 10.

[0077] The double-ended stud sleeve of the present invention will not loosen or pull out the double-ended stud during the process of reversing and withdrawing the double-ended stud from the sleeve after tightening. Furthermore, the double-ended stud sleeve of the present invention can be used to tighten double-ended studs of different specifications by replacing the threaded plate 8 and the limiting steel ball 10.

[0078] In the use of the double-ended stud sleeve of the present invention, a pneumatic or electric tightening tool is inserted into the square hole 106 of the push rod 1, and the threaded plate 8 is aligned with the top of the pre-installed double-ended stud. In the initial stage of tightening the double-ended stud, the threaded plate 8 is first screwed into the top thread of the double-ended stud, and then the double-ended stud is tightened until the connecting rod 3, the limiting steel ball 10 and the top of the double-ended stud are locked. Then the other end (bottom end) of the double-ended stud is screwed into the workpiece. At this time, the screwing of the double-ended stud is completed. In the later stage of tightening, the tightening tool is rotated in the opposite direction to drive the push rod 1 to rotate. The push rod 1 drives the first connecting pin 4 to rotate. Due to the setting of the thrust bearing 2, the friction between the connecting rod 3 and the push rod 1 is very small. The first connecting pin 4 strikes the connecting rod 3 instantly, causing the connecting rod 3 to vibrate and quickly disengage from the limiting steel ball 10. The second connecting pin 6 drives the fixing sleeve 7 to rotate, causing the threaded plate 8 to disengage from the double-ended stud.

[0079] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inner", "outer", etc., 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 the present invention 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 solution.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-ended stud sleeve, characterized in that, It includes a push rod, a connecting rod, a fixing sleeve, and a threaded plate. The push rod is connected to the connecting rod, the fixing sleeve is fixedly sleeved on the connecting rod, and the threaded plate is connected to the end of the fixing sleeve away from the push rod. The threaded plate is provided with a first threaded hole for connection with a double-ended stud; the end of the threaded plate near the connecting rod is provided with a first limiting hole, and a clamping structure is slidably connected in the first limiting hole, and the first limiting hole is connected to the first threaded hole. The connecting rod and the top rod are connected by a release mechanism, which is used to release the clamping structure that is pressed against the end of the connecting rod, thereby releasing the end limit of the double-ended stud. When disassembling the sleeve, the tightening tool rotates in the opposite direction, causing the push rod to rotate. The push rod then drives the unblocking mechanism to rotate. The unblocking mechanism strikes the connecting rod, causing the connecting rod to vibrate and quickly disengage from the clamping structure. The unlocking mechanism includes a first connecting pin and a first pin connecting through hole. The top rod and the connecting rod are connected by the first connecting pin. The connecting rod is provided with a first pin connecting through hole at the position where it is connected to the top rod. The length of the first pin connecting through hole along the circumference of the connecting rod is greater than the diameter of the first connecting pin. The first connecting pin is threaded onto the top rod, and the end of the first connecting pin is connected to the first pin connecting through hole.

2. The double-ended stud sleeve according to claim 1, characterized in that, The clamping structure is a limiting steel ball; The end of the connecting rod near the threaded plate is provided with a second limiting hole, which is coaxial with the first limiting hole. The diameter of the first limiting hole is larger than the diameter of the limiting steel ball, and the diameter of the limiting steel ball is larger than the diameter of the second limiting hole.

3. The double-ended stud sleeve according to claim 2, characterized in that, The length of the first limiting hole is less than the diameter of the limiting steel ball, but greater than the radius of the limiting steel ball; The diameter of the limiting steel ball is larger than the minor diameter of the first threaded hole.

4. The double-ended stud sleeve according to claim 1, characterized in that, The top rod includes a rod head and a rod body connected together, with the rod body inserted into the connecting rod; A thrust bearing is provided between the top rod and the connecting rod, and the thrust bearing is sleeved on the rod body of the top rod.

5. The double-ended stud sleeve according to claim 4, characterized in that, The end of the rod head of the top rod is provided with a square hole for connecting with a tightening tool; The outer side of the rod head of the push rod is provided with an annular rubber groove, and a first pin hole is provided in the rubber groove to connect with the square hole. The push rod is connected to the tightening tool through a cylindrical pin connected in the first pin hole.

6. The double-ended stud sleeve according to claim 5, characterized in that, A rubber ring for limiting the position of the cylindrical pin is fitted inside the groove of the rubber ring.

7. The double-ended stud sleeve according to claim 1, characterized in that, The connecting rod includes a first rod segment, a second rod segment, and a third rod segment integrally arranged in sequence. The end of the first rod segment is provided with a first connecting hole, which is used to be inserted into the top rod. The second rod segment and the third rod segment are sleeved inside the fixed sleeve, and the second rod segment is fixedly connected to the fixed sleeve.

8. The double-ended stud sleeve according to claim 7, characterized in that, A torsion spring is provided between the first rod segment and the fixed sleeve, and the torsion spring is sleeved on the second rod segment; One end of the torsion spring is fixedly connected to the end of the first rod segment, and the other end of the torsion spring is fixedly connected to the end of the fixing sleeve.

9. The double-ended stud sleeve according to claim 1, characterized in that, The connecting rod is connected to the fixed sleeve via a second connecting pin. The fixing sleeve is provided with a second pin connection through hole at the position for connecting with the connecting rod, and the length of the second pin connection through hole along the circumference of the fixing sleeve is greater than the diameter of the second connecting pin. The second connecting pin is threaded onto the connecting rod.

Images