Tightening device for double-end stud

Abstract

The utility model provides a tightening device for a double-end stud. The tightening device comprises an outer sleeve and a plurality of holding claws. The holding claws are obliquely arranged in an inner cavity of the outer sleeve in a sliding mode along the axis of the outer sleeve and slide in the direction of entering or exiting from the inner cavity along with the holding claws, and the distances between the holding claws are correspondingly decreased or increased. A snap-in part used for snap-in of the double-end stud is constructed on the inner side of the holding claw, and an extension abutting part used for abutting against the end of the double-end stud is constructed on the right top of the snap-in part; when the double-end stud needs to be separated from the double-end stud, the double-end stud can be separated from the device by directly lifting the device, so that the assembly efficiency of the double-end stud is improved, and the problem that part of the double-end stud is brought out is solved; when a double-end stud needs to be screwed, the double-end stud is pressed downwards in a penetrating and sleeving mode, the double-end stud can be tightly meshed with the device, other clamping actions are not needed, and the double-end stud can be screwed directly by screwing the device through a drilling machine.

Description

Technical Field

[0001] This utility model relates to the field of double-ended stud assembly technology, and specifically to a tightening device for double-ended studs. Background Technology

[0002] Double-ended studs are cylindrical fasteners with threads at both ends, widely used in moving machinery components. A double-ended stud connection involves screwing one end of the stud into the threaded hole of one of the connected parts, while the other end passes through the through-hole of the other connected part. A matching nut is then fitted and tightened again. When two complex assemblies are secured using double-ended studs, the effect is equivalent to using one less bolt. This not only reduces the number of sub-components but, more importantly, for moving machinery components, reduces the design space required for numerous bolt-fixed connections, resulting in a compact design that aligns with modern lightweight design principles.

[0003] However, after tightening the double-ended stud, the existing tightening device needs to be rotated in the opposite direction to separate the tightening device from the double-ended stud, such as the automatic double-ended stud tightener proposed in publication (announcement) number CN103522255A.

[0004] This design results in low assembly efficiency and makes it easy to pull out some double-ended studs, leading to insufficient tightening depth. Utility Model Content

[0005] In view of this, the problem to be solved by this utility model is to provide a tightening device for double-ended studs.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A tightening device for double-ended studs includes an outer sleeve and several clamping claws;

[0008] Several grippers are evenly distributed at equal intervals around the axis of the outer sleeve within the inner cavity of the outer sleeve.

[0009] The gripper is slidably disposed in the inner cavity of the outer sleeve along the axis of the outer sleeve. As the gripper slides in or out of the inner cavity, the distance between each gripper decreases or increases accordingly. The double-ended stud enters from the opening of the outer sleeve, so that the double-ended stud is located at the center between each gripper. Therefore, as the distance between the grippers decreases or increases, the double-ended stud is clamped or released.

[0010] The inner side of the gripper has a gripping part for engaging the double-ended stud. The top of the gripping part has an extended abutment for abutting the end of the double-ended stud. When the end of the double-ended stud abuts with the extended abutment, as the tightening device moves downward, the double-ended stud pushes the gripper to slide along the direction of entering the inner cavity of the outer sleeve through the extended abutment. The distance between the two sets of grippers continuously decreases until the gripper slides to a stop position, thus achieving the gripper engaging with the double-ended stud. When the device is lifted relative to the double-ended stud, the axial end of the double-ended stud separates from the extended abutment and slides along the direction of exiting the inner cavity of the outer sleeve under its own weight. The distance between the two sets of grippers continuously increases, thus achieving separation from the double-ended stud.

[0011] An inclined anti-detachment slider part is constructed on the outer side of the gripper, and a support base is installed inside the outer sleeve. An inclined anti-detachment groove corresponding to the inclined anti-detachment slider part is opened on the support base.

[0012] The design of the inclined anti-detachment groove and the inclined anti-detachment slider ensures that the gripper will not detach during the sliding process.

[0013] The top of the support base is also connected to a stop. When the claw bites the double-ended stud and slides along the inclined anti-detachment groove until it abuts against the stop, it stops moving forward. The elastic force members of the stop are elastically pressed against the claw on the left and right. When the double-ended stud is screwed, it distributes the torque borne by the inclined anti-detachment slider and the inclined anti-detachment groove.

[0014] The biting part includes a concave arc-shaped surface corresponding to the contour of the double-ended stud and a biting groove corresponding to the threaded teeth of the double-ended stud.

[0015] Depending on the model of the double-ended stud, tightening devices with different specifications of interlocking parts can be installed.

[0016] The outer sleeve has a notch that communicates with the opening of the sleeve in the radial direction, and the support base is installed in the notch and is detachably connected to the outer sleeve.

[0017] The outer sleeve can also be detachably connected to an annular limiting sleeve. The gripper passes through the annular limiting sleeve. A limiting protrusion is also constructed on the connection end between the annular limiting sleeve and the outer sleeve. An extended limiting part for abutting the limiting protrusion is constructed on the side top of the biting part.

[0018] The number of limiting protrusions corresponds to the number of grippers. In the radial direction of the annular limiting sleeve, the distance between the farthest points on the limiting protrusions is less than the inner diameter of the outer sleeve, so that the limiting protrusions can enter the inner cavity of the outer sleeve. The side top of the biting part is constructed with an extended limiting part. When the gripper slides along the direction of exiting the inner cavity of the outer sleeve, the extended limiting part moves synchronously with the gripper until it abuts against the limiting protrusions, thereby preventing the gripper from detaching from the outer sleeve.

[0019] The top of the outer sleeve is detachably connected to a rotating rod, which is used to insert a drilling rig.

[0020] A method for tightening double-ended studs, including the use of a tightening device, further includes the following steps:

[0021] S1: The tightening device passes vertically through the opening of the outer sleeve and onto the double-ended stud until the claw pushed by the double-ended stud stops, so that the claw bites into the double-ended stud in the radial direction.

[0022] S2: Start the drilling rig that is axially connected to the rotary rod, and drive the double-ended stud that is engaged with the claw to rotate synchronously in the axial direction until the double-ended stud moves down to the threshold depth;

[0023] S3: After shutting down the drilling rig, while lifting the tightening device, the gripper moves along the direction of the cylinder opening, and the double-headed stud of the tightening device separates.

[0024] Select a tightening device with a clamping claw that matches the type of the double-ended stud.

[0025] The advantages and positive effects of this utility model are:

[0026] (1) When it is necessary to separate from the double-ended stud, simply lift the device, which will cause the end of the double-ended stud to separate from the outer end. The claws will no longer be restricted by external force and will slide along the inner cavity of the outer sleeve under their own weight. The distance between the two sets of claws will continue to increase, thereby achieving separation from the double-ended stud. There is no need to rotate in the opposite direction. That is, the user can separate the double-ended stud from the device with just one lifting action, which improves the assembly efficiency of the double-ended stud and avoids the problem of bringing out part of the double-ended stud.

[0027] (2) When it is necessary to tighten the double-ended stud, insert the double-ended stud through the opening of the outer sleeve and press down on the device. The double-ended stud pushes the claws along the direction of entering the inner cavity of the outer sleeve through the outer extension. The distance between the two sets of claws continuously decreases, so as to achieve a tight engagement between the claws and the threads of the double-ended stud. That is, the user can achieve a tight engagement between the double-ended stud and the device with just one pressing action. No other clamping action is required. The double-ended stud can be tightened by directly tightening the device with the drilling machine after inserting the double-ended stud. Attached Figure Description

[0028] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0029] In the attached diagram:

[0030] Figure 1 This is an exploded view of a tightening device for double-ended studs according to this utility model;

[0031] Figure 2 This is a diagram showing the connection relationship between the gripper and the support base in this utility model;

[0032] Figure 3 This is a structural diagram of the gripper in this utility model;

[0033] Figure 4 This is a structural diagram of the support base in this utility model;

[0034] Figure 5 This is a diagram showing the connection relationship between the gripper, the support base, and the abutment in this utility model;

[0035] Figure 6 This is a structural diagram of a tightening device for double-ended studs according to the present invention, with the support base concealed.

[0036] Figure 7 This is a structural diagram of the annular limiting sleeve in this utility model.

[0037] In the figure: outer sleeve 1, notch 12, concave arc surface 211, bite groove 212, gripper 2, bite part 21, outer extension abutment part 22, inclined anti-detachment slider part 23, outer extension limiting part 24, support seat 3, inclined anti-detachment sliding groove 31, abutment frame 4, annular limiting sleeve 5, limiting protrusion part 51, and rotating rod 6. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] like Figures 1 to 4 As shown, this utility model provides a tightening device for double-ended studs, including an outer sleeve 1 and several clamping claws 2. The clamping claws 2 are evenly distributed at equal intervals in the inner cavity of the outer sleeve 1 with the axis of the outer sleeve 1 as the center. In this embodiment, two sets of clamping claws 2 are provided. The clamping claws 2 are inclined and slidably disposed in the inner cavity of the outer sleeve 1 along the axis of the outer sleeve 1. As the clamping claws 2 are driven to slide in the direction of entering the inner cavity of the outer sleeve 1 or in the direction of exiting the inner cavity of the outer sleeve 1, the distance between each clamping claw 2 decreases or increases accordingly. The double-ended stud is inserted between the two sets of clamping claws 2, thereby realizing the clamping or release of the double-ended stud.

[0042] The inner side of the gripper 2 is provided with a gripping part 21 for engaging the double-ended stud, thereby achieving a tight engagement of the stud during clamping and preventing it from disengaging during tightening. The top of the gripping part 21 has an extended abutment 22. When the device inserts the double-ended stud and presses it down, the double-ended stud inserts into the inner cavity of the outer sleeve 1. After passing through the gripping part 21 of the gripper 2, the end of the double-ended stud abuts against the extended abutment 22, causing the double-ended stud to push the gripper 2 along the inner cavity of the outer sleeve 1 through the extended abutment 22. As the directional sliding occurs, the distance between the two sets of grippers 2 continuously decreases until the grippers 2 slide to a position where the distance between the two support seats 3 is insufficient for the two sets of grippers 2 to pass through. At this point, the grippers 2 stop, thereby achieving the engagement connection between the grippers 2 and the double-ended stud. When the device is lifted relative to the double-ended stud, the axial end of the double-ended stud separates from the outer extension 22. The grippers 2 are no longer restricted by external forces and slide along the direction of exiting the inner cavity of the outer sleeve 1 under their own weight. The distance between the two sets of grippers 2 continuously increases, thereby achieving separation from the double-ended stud.

[0043] When tightening the double-ended stud, the user only needs to press down once to achieve a tight engagement between the double-ended stud and the device, without the need for any other clamping action.

[0044] When separating this device from the stud, the user can separate the stud from the device with just one upward lifting action, which improves the assembly efficiency of the stud and avoids the problem of pulling out part of the stud.

[0045] like Figure 3 , Figure 4 , Figure 6As shown, specifically, the outer side of the gripper 2 is constructed with an inclined anti-detachment slider part 23, which is an I-shaped design. A support seat 3 is installed inside the outer sleeve 1. The support seat 3 has an inclined anti-detachment groove 31 corresponding to the inclined anti-detachment slider part 23, so that the inclined anti-detachment slider part 23 can only enter and exit through the groove of the inclined anti-detachment slider part 23, avoiding detachment. The support seat 3 is fixedly connected to the outer sleeve 1. In the inner cavity of the outer sleeve 1, the vertical cross-sectional area of ​​the support seat 3 gradually increases with the direction of entering the inner cavity, that is, the distance between the two sets of support seats 3 gradually decreases along the direction of entering the inner cavity, thereby limiting the sliding stroke of the two sets of grippers 2, so that the gripper 2 remains fixed relative to the outer sleeve 1 after gripping the double-ended stud.

[0046] like Figures 3 to 5 As shown, further considering that during the tightening process, most of the torque generated by tightening is borne by the inclined anti-detachment slider 23 and the inclined anti-detachment groove 31, which can easily cause deformation of both over time, thus affecting the gripping of the double-ended stud; therefore, in this device, a stop 4 is also connected to the top of the support base 3. The stop 4 is used to abut against the claw 2 in the axial direction of the outer sleeve 1, that is, when the claw 2 grips the double-ended stud and slides to the stop position on the inclined anti-detachment groove 31, it abuts against the stop 4, thereby dispersing the torque borne by the inclined anti-detachment slider 23 and the inclined anti-detachment groove 31 when tightening the double-ended stud, and when the claw 2 moves along the direction of entering the inner cavity to be flush with the support base 3, it can also limit the movement of the claw 2.

[0047] Specifically, the top of the abutment 4 is connected to the axial end of the inner cavity of the outer sleeve 1 by a spring. The legs of the abutment 4 can be inserted into the gap between the support seat 3 and the outer sleeve 1 so that the abutment 4 and the top of the support seat 3 elastically abut against each other in the lateral direction of the legs. When the claw 2 moves along the direction of entering the inner cavity to the end of the inclined anti-slip groove 31, the claw 2 is flush with the support seat 3, thereby realizing the elastic abutment of the abutment 4 against the claw 2.

[0048] like Figures 5 to 7 As shown, furthermore, in order to facilitate the assembly of this device, a notch 12 communicating with the cylinder opening is provided in the radial direction of the outer sleeve 1. The support seat 3 is installed in the notch 12 and is detachably connected to the outer sleeve 1. Thus, the connection between the support frame 4, the support seat 3, and the outer sleeve 1 is realized by fixing the relative position of the support seat 3 and the outer sleeve 1.

[0049] The outer sleeve 1 can also be detachably connected to an annular limiting sleeve 5. The gripper 2 is set through the annular limiting sleeve 5. The connection end of the annular limiting sleeve 5 and the outer sleeve 1 is also constructed with a limiting protrusion 51. The number of limiting protrusions 51 corresponds to the number of grippers 2. The distance between the farthest points on the two sets of limiting protrusions 51 is less than the inner diameter of the outer sleeve 1, so that the limiting protrusions 51 can enter the inner cavity of the outer sleeve 1. The side top of the biting part 21 is constructed with an extended limiting part 24. After the gripper 2 is inserted into the inclined anti-detachment sliding groove 31 through the inclined anti-detachment sliding block part 23, the limiting protrusion 51 enters the inner cavity of the outer sleeve 1 by fixing the relative position of the annular limiting sleeve 5 and the outer sleeve 1. When the gripper 2 slides in the direction of exiting the inner cavity of the outer sleeve 1, the extended limiting part 24 moves synchronously with the gripper 2 until it abuts against the limiting protrusion 51, thereby preventing the gripper 2 from detaching from the outer sleeve 1.

[0050] like Figure 2 As shown, specifically, the biting part 21 includes a concave arc-shaped surface 211 corresponding to the contour of the double-ended stud, and a biting groove 212 formed on the concave arc-shaped surface 211 corresponding to the threaded teeth of the double-ended stud.

[0051] like Figure 7 As shown, specifically, the top of the outer sleeve 1 is detachably connected to a rotating rod 6, which is used to insert the drilling rig; depending on the model of the double-ended stud, a tightening device with a different specification of engagement part 21 can be set accordingly. In use, it can be quickly disassembled and replaced by rotating rod 6. Rotating rod 6 is existing technology, so it will not be described in detail.

[0052] In this embodiment, the detachable connection method includes, but is not limited to, threaded connection via bolts and an internal threaded groove.

[0053] The working principle and process of this utility model are as follows:

[0054] When it is necessary to tighten the double-ended stud, the double-ended stud is inserted through the opening of the outer sleeve 1 and the device is pressed down. The end of the double-ended stud passes through the biting part 21 of the claw 2 in the inner cavity of the outer sleeve 1 and abuts against the outer extension part 22 of the claw 2. As the device is pressed down, the double-ended stud pushes the claw 2 to slide along the direction of entering the inner cavity of the outer sleeve 1 through the outer extension part 22. The distance between the two sets of claws 2 continuously decreases until the claw 2 slides to the stop position, that is, the abutment 4 abuts against the claw 2. At this time, the claw 2 and the thread of the double-ended stud are tightly engaged and connected. Then the drilling machine drives the rotation of the entire device through the rotating rod 6 to tighten the double-ended stud.

[0055] When separation from the double-ended stud is required, the device is lifted directly, thereby separating the end of the double-ended stud from the outer extension 22. The gripper 2 is no longer restricted by external force and slides along the direction of exiting the inner cavity of the outer sleeve 1 under its own weight. The distance between the two sets of grippers 2 continuously increases, thereby achieving separation from the double-ended stud.

[0056] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A tightening device for double-ended studs, characterized in that, Includes an outer sleeve (1) and several grippers (2); The top end of the outer sleeve (1) is detachably connected to a swivel rod (6) for inserting a drilling rig; The gripper (2) is slidably disposed in the inner cavity of the outer sleeve (1) along the axis of the outer sleeve (1), and as the gripper (2) slides in or out of the inner cavity, the distance between each gripper (2) decreases or increases accordingly. The inner side of the gripper (2) is provided with a gripping part (21) for gripping the double-ended stud, and the top of the gripping part (21) is provided with an extended abutment part (22) for abutting the end of the double-ended stud.

2. A tightening device for double-ended studs according to claim 1, characterized in that, An inclined anti-detachment slider part (23) is constructed on the outer side of the gripper (2), and a support base (3) is installed inside the outer sleeve (1). An inclined anti-detachment groove (31) corresponding to the inclined anti-detachment slider part (23) is opened on the support base (3).

3. A tightening device for double-ended studs according to claim 2, characterized in that, The top of the support base (3) is also connected to a stop (4), which is used to abut against the claw (2) in the axial direction of the outer sleeve (1), thereby dispersing the torque carried by the inclined anti-detachment slider (23) and the inclined anti-detachment groove (31) when the double-headed stud is screwed.

4. A tightening device for double-ended studs according to claim 3, characterized in that, One end of the abutment (4) is connected to the axial end of the inner cavity of the outer sleeve (1) by a spring, and the other end of the abutment (4) abuts against the support seat (3) so that the claw (2) slides to be flush with the abutment (4) and abuts against the claw (2).

5. A tightening device for double-ended studs according to claim 1, characterized in that, The bite portion (21) includes a concave arc-shaped surface (211) corresponding to the outline of the double-ended stud and a bite groove (212) corresponding to the threaded teeth of the double-ended stud.

6. A tightening device for double-ended studs according to claim 3, characterized in that, The outer sleeve (1) has a notch (12) in the radial direction that communicates with the opening of the sleeve. The support base (3) is installed in the notch (12) and is detachably connected to the outer sleeve (1).

7. A tightening device for double-ended studs according to claim 6, characterized in that, The outer sleeve (1) can also be detachably connected to an annular limiting sleeve (5). The gripper (2) is set through the annular limiting sleeve (5). The connection end of the annular limiting sleeve (5) and the outer sleeve (1) is also constructed with a limiting protrusion (51). The side top of the biting part (21) is constructed with an extended limiting part (24) for abutting the limiting protrusion (51).

Images