Screw sleeve tightening tool

Abstract

The invention relates to the technical field of thread tightening tools, and discloses a thread sleeve tightening tool which comprises a screw rod and an auxiliary retaining assembly arranged on the screw rod in a sleeving mode, the auxiliary retaining assembly comprises an upper ratchet wheel sleeve, a lower ratchet wheel sleeve and a limiting sleeve used for abutting against the end face of a thread sleeve, and the upper ratchet wheel sleeve and the lower ratchet wheel sleeve are matched through ratchet wheel teeth. The upper ratchet sleeve is arranged on the top of the screw in a sleeving mode and can rotate in the circumferential direction of the screw, the screw is further provided with a limiting piece used for limiting the rotating angle of the upper ratchet sleeve, the lower ratchet sleeve and the limiting sleeve are arranged on the screw in a vertically sliding and sleeving mode through the limiting piece, and the limiting piece is used for limiting the vertical moving distance of the lower ratchet sleeve and the limiting sleeve. The screw tightening tool can solve the technical problems that when an existing screw tightening tool retreats, a pre-tightening nut needs to be manually loosened to release pre-tightening force between a screw and a screw sleeve, operation is tedious, and working efficiency is low.

Description

Technical Field

[0001] The invention relates to the technical field of threaded tightening tools, and in particular to a threaded sleeve tightening tool. Background Art

[0002] A threaded sleeve, also known as a threaded sleeve or a threaded sleeve, is a sleeve with internal and external threads, usually used to screw into a threaded hole of a workpiece; Figure 1 As shown, in the prior art, when tightening the screw, generally a screw rod 1 and a spanner are used, and the top of the screw rod 1 cooperates with the spanner. First, the screw rod 1 is connected to the internal thread of the screw sleeve 200, and a pre-tightening nut 201 is set on the screw rod 1. The lower end surface of the pre-tightening nut 201 and the upper end surface of the screw sleeve 200 are against each other to generate friction. Then, the screw rod 1 is rotated by the spanner, and the screw sleeve 200 is tightened in the threaded hole 101 of the workpiece 100 under the joint action of the screw rod 1 and the pre-tightening nut 201; however, after the screw sleeve 200 is tightened, the screw rod 1 and the screw sleeve 200 are locked, and there is also a pre-tightening force between the two. Therefore, when the screw rod 1 is rotated in the opposite direction to make it withdraw from the screw sleeve 200, the screw sleeve 200 will also be brought out of the threaded hole 101.

[0003] In order to solve this problem, the current method is to manually loosen the pre-tightening nut 201 first, remove the friction between the pre-tightening nut 201 and the end face of the screw sleeve 200, thereby releasing the pre-tightening force of the screw 1 and the screw sleeve 200, and finally rotate the screw 1 in the opposite direction. At this time, the screw 1 moves relative to the screw sleeve 200 and gradually withdraws. However, this operation method is more cumbersome, and our company has a large amount of assembly work every day. Each time it withdraws, it is necessary to manually loosen the pre-tightening nut 201, which reduces work efficiency.

[0004] Based on this, our company has designed a tightening tool specifically for threaded sleeves, which can automatically eliminate the friction between the pre-tightening nut and the threaded sleeve when withdrawing the tool, thereby releasing the pre-tightening force of the screw and the threaded sleeve, so that the threaded sleeve will not be brought out when the screw is withdrawn by rotating in the opposite direction. The technical solution of this application has a simple structure and is easy to operate, which effectively improves the assembly efficiency and reduces the workload of the staff. Summary of the invention

[0005] The present invention aims to provide a screw sleeve tightening tool to solve the technical problem that the existing screw tightening tool needs to manually loosen the pre-tightening nut to release the pre-tightening force between the screw and the screw sleeve when retracting, resulting in cumbersome operation and low work efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The screw sleeve tightening tool includes a screw rod and an auxiliary backstop assembly mounted on the screw rod, the auxiliary backstop assembly includes an upper ratchet sleeve, a lower ratchet sleeve and a limit sleeve for abutting against the end face of the screw sleeve, the upper ratchet sleeve and the lower ratchet sleeve cooperate with each other through ratchet teeth, the upper ratchet sleeve is mounted on the top of the screw rod and can rotate along the circumference of the screw rod, the screw rod is also provided with a limit piece for limiting the rotation angle of the upper ratchet sleeve, the lower ratchet sleeve and the limit sleeve can be slidably mounted on the screw rod up and down through the limit piece, and the limit piece is used to limit the vertical movement distance of the lower ratchet sleeve and the limit sleeve.

[0008] The principles and advantages of this solution are:

[0009] Since the upper ratchet sleeve is rotatably sleeved on the screw rod, and the lower ratchet sleeve and the limit sleeve are vertically slidably sleeved on the screw rod, when the screw sleeve needs to be tightened, the lower end of the screw rod is first screwed into the internal thread of the screw sleeve, and the screw sleeve is screwed into the threaded hole of the workpiece to be assembled, and then the upper ratchet sleeve is driven to move by a tightening tool such as a tightening gun, because the upper ratchet sleeve and the lower ratchet sleeve are matched through the ratchet teeth;

[0010] When the upper ratchet sleeve rotates to abut against the limiting member, the ratchet inclined surface of the upper ratchet sleeve gradually cooperates with the ratchet inclined surface of the lower ratchet sleeve and pushes the lower ratchet sleeve to move downward. When the lower ratchet sleeve moves downward and pushes the limiting sleeve to move downward to abut against the end face of the screw sleeve, the ratchet teeth of the upper ratchet sleeve and the lower ratchet sleeve are fully engaged to generate a pre-tightening force. At this time, the upper ratchet sleeve, the lower ratchet sleeve and the limiting sleeve are fully matched to form a retreat-stopping component that can prevent the screw sleeve from retreating.

[0011] Then continue to rotate the upper ratchet sleeve. At this time, due to the action of the limiter, the upper ratchet sleeve does not move relative to the screw rod when rotating the upper ratchet sleeve. Instead, the rotation torque is transmitted to the screw rod under the action of the limiter, so that the screw rod rotates and under the action of the stop assembly, the screw sleeve is gradually screwed into the threaded hole of the workpiece to be assembled;

[0012] When the screw sleeve is completely screwed into the threaded hole, the upper ratchet sleeve is rotated in the opposite direction. At this time, the ratchet teeth of the upper ratchet sleeve are gradually disengaged from the ratchet teeth of the lower ratchet sleeve, so that the pre-tightening force between the upper and lower ratchet sleeves disappears, and the upper ratchet sleeve, the lower ratchet sleeve and the limiting sleeve are disengaged from each other, thereby leaving a gap between the limiting sleeve and the end surface of the screw sleeve, releasing the friction between the limiting sleeve and the screw sleeve, so that no pre-tightening force is generated between the screw and the screw sleeve; then continue to rotate the upper ratchet sleeve in the opposite direction until the upper ratchet sleeve is restricted by the limiting member, and drive the screw to rotate in the opposite direction under the action of the limiting member, so that the screw gradually withdraws from the screw sleeve, and the assembly of the screw sleeve is completed.

[0013] To sum up, the screw sleeve tightening tool provided by the present application does not require an additional pre-tightening nut for preventing withdrawal when tightening. When the upper ratchet sleeve and the lower ratchet sleeve generate a pre-tightening force, the limit sleeve and the end face of the screw sleeve abut against each other to form a stop assembly, which is used to assist in screwing the screw sleeve into the threaded hole of the workpiece; when the tightening tool needs to be withdrawn, it only needs to be rotated in the opposite direction to release the pre-tightening force between the upper ratchet sleeve and the lower ratchet sleeve, thereby releasing the pre-tightening force between the screw and the screw sleeve, thereby solving the problem of bringing out the tightened screw sleeve again when withdrawing the screw; and the tightening tool has a simple structure and is easy to operate, and does not require manual removal of the pre-tightening force of the screw and the screw sleeve, thereby improving assembly efficiency.

[0014] Preferably, as an improvement, the limiting member is a limiting pin, which is passed through the screw rod, and the upper ratchet sleeve, the lower ratchet sleeve and the limiting sleeve are all provided with long limiting holes, the free ends of the three groups of limiting pins respectively extend into their respective limiting holes, and the limiting holes and the limiting pins are slidably connected; the limiting holes on the upper ratchet sleeve are arranged along the circumference of the upper ratchet sleeve, and the limiting holes on the lower ratchet sleeve and the limiting sleeve are vertically arranged.

[0015] Beneficial effects: By setting a horizontal limit hole on the upper ratchet sleeve, the limit hole cooperates with the limit pin to limit the clockwise or counterclockwise rotation angle of the upper ratchet sleeve, ensuring that when it rotates to the extreme position, the rotational torque is transmitted to the screw to drive the screw to rotate; vertical limit holes are set on the lower ratchet sleeve and the limit sleeve, and cooperate with the limit pin to limit the vertical movement distance of the lower ratchet sleeve and the limit sleeve; the cooperation relationship between the limit hole and the limit pin makes the structure of the device simpler, which is conducive to reducing manufacturing costs and maintenance costs.

[0016] Preferably, as an improvement, the length of the limiting hole on the upper ratchet sleeve is greater than or equal to the length of the limiting holes on the lower ratchet sleeve and the limiting sleeve.

[0017] Beneficial effect: It is helpful to ensure that when the upper ratchet sleeve is rotated into place or is about to be rotated into place, the ratchet teeth of the upper ratchet sleeve must fully cooperate with the ratchet teeth of the lower ratchet sleeve to generate a preload force, and exert a force on the limit sleeve to make it press against the end face of the screw sleeve, thereby generating friction between the screw sleeve and the limit sleeve.

[0018] Preferably, as an improvement, the width of the limiting hole on the limiting sleeve is greater than the diameter of the limiting pin.

[0019] Beneficial effect: ensure that the limit sleeve can move smoothly in the vertical direction, and avoid the limit hole and the limit pin from getting stuck.

[0020] Preferably, as an improvement, the axes of the three groups of limit pins are on the same vertical plane.

[0021] Beneficial effects: easy to process and quick to install.

[0022] Preferably, as an improvement, the diameter of the upper ratchet sleeve is larger than the diameter of the lower ratchet sleeve, and the ratchet teeth of the upper ratchet sleeve are larger than the ratchet teeth of the lower ratchet sleeve.

[0023] Beneficial effect: Since the upper ratchet sleeve is provided with a long strip of limiting holes, the strength of the upper ratchet sleeve is reduced and it is easy to be damaged in actual use. By increasing the diameter of the upper ratchet sleeve, it is beneficial to improve the strength of the upper ratchet sleeve and thus increase the service life.

[0024] Preferably, as an improvement, a protective cover is further provided at the bottom of the limiting cover.

[0025] Beneficial effect: The protective sleeve is provided to protect the end face of the screw sleeve to avoid friction, wear, abrasion, scratching and other problems between the limit sleeve and the screw sleeve when the limit sleeve rotates.

[0026] Preferably, as an improvement, a connecting column for cooperating with a tightening wrench is also provided on the top of the upper ratchet sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of tightening the screw sleeve in the prior art;

[0028] Figure 2 It is a front view of the threaded sleeve tightening tool of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the upper ratchet sleeve of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the present invention after the upper ratchet sleeve is omitted;

[0031] Figure 5 It is a schematic diagram of the structure of the limiting sleeve of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the protective cover of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure in Embodiment 3. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: workpiece 100, threaded hole 101, screw sleeve 200, pre-tightening nut 201, screw rod 1, upper ratchet sleeve 2, ratchet teeth 20, first limiting hole 21, connecting column 22, lower ratchet sleeve 3, second limiting hole 31, limiting sleeve 4, boss 40, third limiting hole 41, annular groove 42, limiting pin 5, first limiting pin 51, second limiting pin 52, third limiting pin 53, protective cover 6, stepped hole 60, frame 7, lifting assembly 71, rotating assembly 72, mounting sleeve 73.

[0036] Embodiment 1

[0037] like Figure 2-4 As shown, the screw sleeve tightening tool includes a screw rod 1 and an auxiliary back-stop assembly sleeved on the screw rod 1, the auxiliary back-stop assembly includes an upper ratchet sleeve 2, a lower ratchet sleeve 3 and a limit sleeve 4 for abutting against the end face of the screw sleeve 200 that cooperate with each other, the upper ratchet sleeve 2 and the lower ratchet sleeve 3 cooperate with each other through ratchet teeth 20, and in this embodiment, the diameter of the upper ratchet sleeve 2 is greater than the diameter of the lower ratchet sleeve 3, and the ratchet teeth 20 of the upper ratchet sleeve 2 are greater than the ratchet teeth 20 of the lower ratchet sleeve 3, which is beneficial to improve the strength of the upper ratchet sleeve 2; the upper ratchet sleeve 2 is sleeved on the top of the screw rod 1 and can rotate along the circumference of the screw rod 1, and a limit piece for limiting the rotation angle of the upper ratchet sleeve 2 is also provided on the screw rod 1, and the lower ratchet sleeve 3 and the limit sleeve 4 can be slidably sleeved on the screw rod 1 up and down through the limit piece, and the limit piece is used to limit the vertical movement distance of the lower ratchet sleeve 3 and the limit sleeve 4.

[0038] Specifically, the limiting member in this embodiment is a limiting pin 5, which is inserted into the screw rod 1. The upper ratchet sleeve 2, the lower ratchet sleeve 3, and the limiting sleeve 4 are all provided with long limiting holes. The free ends of the three groups of limiting pins 5 extend into their respective limiting holes, and the limiting holes are slidably connected to the limiting pins 5. The limiting holes on the upper ratchet sleeve 2 are arranged along the circumference of the upper ratchet sleeve 2, and the limiting holes on the lower ratchet sleeve 3 and the limiting sleeve 4 are arranged vertically. During installation, each component is first sleeved, and then the limiting pin 5 is knocked in sequentially. The limiting pin 5 is tension-connected with the pin hole provided on the screw rod 1, and the axes of the three groups of limiting pins 5 are in the same vertical plane after installation.

[0039] For the sake of ease of distinction, in this embodiment, the three groups of limit pins 5 and limit holes are referred to as the first limit pin 51 and the first limit hole 21, the second limit pin 52 and the second limit hole 31, the third limit pin 53 and the third limit hole 41 from top to bottom; and in this embodiment, the length of the first limit hole 21 on the upper ratchet sleeve 2 is greater than or equal to the length of the second limit hole 31 on the lower ratchet sleeve 3 and the third limit hole 41 on the limit sleeve 4; the width of the third limit hole 41 on the limit sleeve 4 is greater than the diameter of the third limit pin 53, ensuring that the limit sleeve 4 can move smoothly in the vertical direction to avoid the third limit hole 41 and the third limit pin 53 from getting stuck, resulting in the inability to release the preload.

[0040] The bottom of the limiting sleeve 4 is also provided with a protective sleeve 6, and specifically, the protective sleeve 6 is made of nylon protective sleeve; Figure 5-6 As shown, a boss 40 is provided at the lower end of the limiting sleeve 4, wherein an annular groove 42 is also provided at the lower end of the limiting sleeve 4, and the annular groove 42 isolates the boss 40. A stepped hole 60 for cooperating with the boss 40 is provided in the protective sleeve 6. During installation, the stepped hole 60 is tightened on the boss 40 of the limiting sleeve 4. The protective sleeve 6 is provided to protect the end face of the screw sleeve 200 to avoid friction, wear, abrasion or scratching caused by direct contact between the limiting sleeve 4 and the screw sleeve 200 when the limiting sleeve 4 rotates.

[0041] In this embodiment, a connecting column 22 for cooperating with a tightening wrench is further provided on the top of the upper ratchet sleeve 2 to facilitate the connection between the tightening wrench and the upper ratchet sleeve 2 and to drive the upper ratchet sleeve 2 to rotate.

[0042] Specifically, the method of using the screw sleeve tightening tool is as follows:

[0043] When it is necessary to tighten the screw sleeve 200, first screw the lower end of the screw rod 1 into the internal thread of the screw sleeve 200, screw the screw sleeve 200 into the threaded hole 101 of the workpiece 100 to be assembled, and then install a tightening tool such as a tightening gun on the upper ratchet sleeve 2, and use the tightening gun to drive the upper ratchet sleeve 2 to rotate. Since the upper ratchet sleeve 2 and the lower ratchet sleeve 3 cooperate with each other through the ratchet teeth 20; when the upper ratchet sleeve 2 rotates to abut against the limit pin 5, the ratchet inclined surface of the upper ratchet sleeve 2 gradually cooperates with the ratchet inclined surface of the lower ratchet sleeve 3, and pushes the lower ratchet sleeve 3 to move downward. When the lower ratchet sleeve 3 moves downward and pushes the limiting sleeve 4 to move downward to abut against the end face of the screw sleeve 200, the ratchet teeth 20 of the upper ratchet sleeve 2 and the lower ratchet sleeve 3 are fully engaged to generate a pre-tightening force. At this time, the upper ratchet sleeve 2, the lower ratchet sleeve 3, and the limiting sleeve 4 are fully matched to form a retreat-stopping component that can prevent the screw sleeve 200 from retreating.

[0044] Then continue to rotate the upper ratchet sleeve 2. At this time, due to the action of the limit pin 5, the upper ratchet sleeve 2 does not move relative to the screw rod 1 when the upper ratchet sleeve 2 is rotated. Instead, the rotation torque is transmitted to the screw rod 1 under the action of the limit pin 5, so that the screw rod 1 rotates, and under the action of the stop assembly, the screw sleeve 200 is gradually screwed into the threaded hole 101 of the workpiece 100 to be assembled; when the screw sleeve 200 is completely screwed into the threaded hole 101, the upper ratchet sleeve 2 is rotated in the opposite direction. At this time, the ratchet teeth 20 of the upper ratchet sleeve 2 are gradually disengaged from the ratchet teeth 20 of the lower ratchet sleeve 3, so that The pre-tightening force between the upper ratchet sleeve 2 and the lower ratchet sleeve 3 disappears, and the upper ratchet sleeve 2, the lower ratchet sleeve 3, and the limiting sleeve 4 are disengaged from each other, thereby leaving a gap between the limiting sleeve 4 and the end surface of the screw sleeve 200, releasing the friction between the limiting sleeve 4 and the screw sleeve 200, so that no pre-tightening force is generated between the screw rod 1 and the screw sleeve 200; then continue to rotate the upper ratchet sleeve 2 in the opposite direction until the upper ratchet sleeve 2 is restricted by the limiting pin 5, and drive the screw rod 1 to rotate in the opposite direction under the action of the limiting pin 5, so that the screw rod 1 gradually withdraws from the screw sleeve 200, and the assembly of the screw sleeve 200 is completed.

[0045] The screw sleeve tightening tool provided by the present application does not require an additional pre-tightening nut 201 for preventing withdrawal when tightening. When the upper ratchet sleeve 2 and the lower ratchet sleeve 3 generate a pre-tightening force, the limit sleeve 4 and the end face of the screw sleeve 200 abut against each other to form a stop-retraction component, which is used to assist in screwing the screw sleeve 200 into the threaded hole 101 of the workpiece; when the tightening tool needs to be withdrawn, it only needs to be rotated in the opposite direction to release the pre-tightening force between the upper ratchet sleeve 2 and the lower ratchet sleeve 3, thereby releasing the pre-tightening force between the screw rod 1 and the screw sleeve 200, thereby solving the problem of bringing out the tightened screw sleeve 200 again when withdrawing the screw rod 1; and the tightening tool has a simple structure and is easy to operate, and does not require manual removal of the pre-tightening force of the screw rod 1 and the screw sleeve 200, thereby improving the assembly efficiency.

[0046] Embodiment 2

[0047] The present embodiment also provides a screw sleeve tightening device for a gearbox housing, comprising a screw sleeve tightening tool, which is used to install the screw sleeve in the internal threaded hole of the gearbox housing; and also comprises a main body, on which an installation station and a frame are provided, the frame is located above the installation station, the screw sleeve tightening tool is arranged on the frame, and the installation station is used to fix the gearbox housing.

[0048] Embodiment 3

[0049] This embodiment also provides a frame for mounting a screw sleeve tightening tool, such as Figure 7As shown, the frame includes a frame body 7, a lifting assembly 71, a rotating assembly 72 and a mounting sleeve 73. The lifting assembly 71 is arranged on the frame body 7, and the power output end of the lifting assembly 71 is connected to the mounting sleeve 73. The rotating assembly 72 is arranged on the mounting sleeve 73. The screw sleeve tightening tool is rotatably connected to the mounting sleeve 73, and the power output end of the rotating assembly 72 is used to drive the upper ratchet sleeve 2 of the screw sleeve tightening tool to rotate.

[0050] Specifically, in this embodiment, the lifting component 71 is a cylinder, and the rotating component 72 is a motor. A sleeve is fixed on the rotating shaft of the motor. The sleeve is used to connect with the connecting column 22 at the top of the upper ratchet sleeve 2. The upper ratchet sleeve 2 is driven to rotate by the forward and reverse rotation of the motor, and the mounting sleeve 73 is driven to move in the vertical direction by the cylinder.

[0051] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A screw sleeve tightening tool, characterized in that: It includes a screw rod and an auxiliary backstop assembly sleeved on the screw rod, the auxiliary backstop assembly includes an upper ratchet sleeve, a lower ratchet sleeve and a limit sleeve for abutting against the end face of the screw sleeve that cooperate with each other, the upper ratchet sleeve and the lower ratchet sleeve cooperate with each other through ratchet teeth, the upper ratchet sleeve is sleeved on the top of the screw rod and can rotate along the circumference of the screw rod, and the screw rod is also provided with a limit piece for limiting the rotation angle of the upper ratchet sleeve, the lower ratchet sleeve and the limit sleeve can be slidably sleeved on the screw rod up and down through the limit piece, and the limit piece is used to limit the vertical movement distance of the lower ratchet sleeve and the limit sleeve.

2. The threaded sleeve tightening tool according to claim 1, characterized in that: The limiting part is a limiting pin, which is passed through the screw rod. The upper ratchet sleeve, the lower ratchet sleeve and the limiting sleeve are all provided with long limiting holes. The free ends of the three groups of limiting pins extend into their respective limiting holes, and the limiting holes and the limiting pins are slidably connected. The limiting holes on the upper ratchet sleeve are arranged along the circumference of the upper ratchet sleeve, and the limiting holes on the lower ratchet sleeve and the limiting sleeve are arranged vertically.

3. The threaded sleeve tightening tool according to claim 2, characterized in that: The length of the limiting hole on the upper ratchet sleeve is greater than or equal to the length of the limiting holes on the lower ratchet sleeve and the limiting sleeve.

4. The threaded sleeve tightening tool according to claim 3, characterized in that: The width of the limiting hole on the limiting sleeve is greater than the diameter of the limiting pin.

5. The threaded sleeve tightening tool according to claim 4, characterized in that: The axes of the three groups of limit pins are on the same vertical plane.

6. The threaded sleeve tightening tool according to any one of claims 1 to 5, characterized in that: The diameter of the upper ratchet sleeve is larger than the diameter of the lower ratchet sleeve, and the ratchet teeth of the upper ratchet sleeve are larger than the ratchet teeth of the lower ratchet sleeve.

7. The threaded sleeve tightening tool according to claim 6, characterized in that: A protective cover is also provided at the bottom of the limiting cover.

8. The threaded sleeve tightening tool according to claim 7, characterized in that: The top of the upper ratchet sleeve is also provided with a connecting column for matching with a tightening wrench.

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