Sleeve tightening tool

Abstract

The present application relates to the technical field of thread tightening tools, and discloses a screw sleeve tightening tool, which comprises a screw rod and an auxiliary retreat-stopping assembly sleeved on the screw rod, the auxiliary retreat-stopping assembly comprises an upper ratchet sleeve, a lower ratchet sleeve and a limiting sleeve used for abutting against the end face of the screw sleeve, the upper ratchet sleeve and the lower ratchet sleeve are matched 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, the screw rod is further provided with a limiting piece used for limiting the rotation angle of the upper ratchet sleeve, and the lower ratchet sleeve and the limiting sleeve are slidably sleeved on the screw rod through the limiting piece, and the limiting piece is used for limiting the vertical movement distance of the lower ratchet sleeve and the limiting sleeve. The present application can solve the technical problem that the existing screw rod tightening tool needs to manually loosen the pre-tightening nut to release the pre-tightening force between the screw rod and the screw sleeve when retreating, thereby leading to complicated operation and low work efficiency.

Description

Technical Field

[0001] This invention relates to the field of thread tightening tools, and more specifically to a threaded sleeve tightening tool. Background Technology

[0002] A threaded insert, also known as a threaded sleeve or threaded bushing, is a sleeve with internal and external threads, typically used to screw into threaded holes in workpieces; for example... Figure 1 As shown, in the prior art, during specific assembly and tightening, a screw 1 and a wrench are generally used, with the top of the screw 1 engaging with the wrench. First, the screw 1 is connected to the internal thread of the sleeve 200, and a preload nut 201 is placed on the screw 1. The lower end face of the preload nut 201 abuts against the upper end face of the sleeve 200 to generate friction. Then, the screw 1 is rotated by the wrench, and under the combined action of the screw 1 and the preload nut 201, the sleeve 200 is tightened into the threaded hole 101 of the workpiece 100. However, after the sleeve 200 is tightened, the screw 1 and the sleeve 200 are locked, and there is also a preload force between them. Therefore, when the screw 1 is rotated in the opposite direction to remove it from the sleeve 200, the sleeve 200 will also be pulled out of the threaded hole 101.

[0003] To solve this problem, the current method is to first manually loosen the preload nut 201 to remove the friction between the preload nut 201 and the end face of the threaded sleeve 200, thereby releasing the preload force between the screw 1 and the threaded sleeve 200. Finally, the screw 1 is rotated in the opposite direction, at which point the screw 1 moves relative to the threaded sleeve 200 and gradually exits. However, this operation method is relatively troublesome, and our company has a large daily assembly workload. Every time we exit, we need to manually loosen the preload nut 201 first, which reduces work efficiency.

[0004] Based on this, our company has designed a tightening tool specifically for threaded sleeves. When the tool is withdrawn, it can automatically eliminate the friction between the pre-tightened nut and the threaded sleeve, thereby releasing the pre-tightening force between the screw and the threaded sleeve. This prevents the threaded sleeve from being pulled out when the screw is rotated in the opposite direction to withdraw. Furthermore, the technical solution of this application has a simple structure and is easy to operate, effectively improving assembly efficiency and reducing the workload of workers. Summary of the Invention

[0005] The present invention aims to provide a screw sleeve tightening tool to solve the technical problem that existing screw tightening tools require manually loosening the preload nut to release the preload between the screw and the screw sleeve when retracting, which leads to cumbersome operation and low work efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A screw thread tightening tool includes a screw and an auxiliary anti-reverse assembly fitted on the screw. The auxiliary anti-reverse assembly includes an upper ratchet sleeve, a lower ratchet sleeve, and a limiting sleeve for abutting against the end face of the screw thread. The upper ratchet sleeve and the lower ratchet sleeve are engaged by ratchet teeth. The upper ratchet sleeve is fitted on the top of the screw and can rotate around the circumference of the screw. The screw is also provided with a limiting member for limiting the rotation angle of the upper ratchet sleeve. The lower ratchet sleeve and the limiting sleeve are slidably fitted on the screw through the limiting member, which is used to limit the vertical movement distance of the lower ratchet sleeve and the limiting sleeve.

[0008] The principle and advantages of this scheme are:

[0009] Since the upper ratchet sleeve is rotatably mounted on the screw, and the lower ratchet sleeve and the limiting sleeve are vertically slidably mounted on the screw, when it is necessary to tighten the screw sleeve, first screw the lower end of the screw into the internal thread of the screw sleeve, screw the screw sleeve into the threaded hole of the workpiece to be assembled, and then drive the upper ratchet sleeve to move by tightening tools such as tightening guns. Since the upper ratchet sleeve and the lower ratchet sleeve are engaged by 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 engages with the ratchet inclined surface of the lower ratchet sleeve, pushing the lower ratchet sleeve to move downward. When the lower ratchet sleeve moves downward and pushes the limiting sleeve downward to abut against the end face of the threaded sleeve, the ratchet teeth of the upper and lower ratchet sleeves are fully engaged, generating a preload force. At this time, the upper ratchet sleeve, lower ratchet sleeve, and limiting sleeve are fully engaged to form an anti-reverse component that can prevent the threaded sleeve from retracting.

[0011] Then continue to rotate the upper ratchet sleeve. At this time, due to the action of the limiting component, the upper ratchet sleeve does not move relative to the screw when rotating. Instead, under the action of the limiting component, the rotational torque is transmitted to the screw, causing the screw to rotate. Under the action of the anti-reverse component, the screw sleeve is gradually screwed into the threaded hole of the workpiece to be assembled.

[0012] When the screw sleeve is fully screwed into the threaded hole, rotate the upper ratchet sleeve in the opposite direction. At this time, the ratchet teeth of the upper ratchet sleeve gradually disengage from the ratchet teeth of the lower ratchet sleeve, causing the preload between the upper and lower ratchet sleeves to disappear. The upper ratchet sleeve, lower ratchet sleeve, and limit sleeve disengage from each other, thus leaving a gap between the end face of the limit sleeve and the screw sleeve, releasing the friction between the limit sleeve and the screw sleeve, so that no preload 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 limit member, and under the action of the limit member, it drives the screw to rotate in the opposite direction, so that the screw gradually exits the screw sleeve, completing the assembly of the screw sleeve.

[0013] In summary, the threaded sleeve tightening tool provided in this application does not require an additional preload nut for preventing backlash during tightening. When the upper and lower ratchet sleeves generate preload, the limiting sleeve abuts against the end face of the threaded sleeve to act as a backlash prevention component, assisting in screwing the threaded sleeve into the threaded hole of the workpiece. When it is necessary to remove the tightening tool, simply rotate in the opposite direction to release the preload between the upper and lower ratchet sleeves, thereby releasing the preload between the screw and the threaded sleeve. This solves the problem of pulling out the already tightened threaded sleeve again when removing the screw. Furthermore, the tightening tool has a simple structure and is easy to operate, eliminating the need for manual removal of the preload from the screw and threaded sleeve, thus improving assembly efficiency.

[0014] Preferably, as an improvement, the limiting component is a limiting pin, which passes through the screw. The upper ratchet sleeve, the lower ratchet sleeve, and the limiting sleeve are all provided with elongated limiting holes. The free ends of the three sets 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, while the limiting holes on the lower ratchet sleeve and the limiting sleeve are arranged vertically.

[0015] Beneficial effects: By setting a horizontal limiting hole on the upper ratchet sleeve, which cooperates with a limiting pin, the angle of clockwise or counterclockwise rotation of the upper ratchet sleeve is limited, ensuring that when it rotates to the limit position, the rotational torque is transmitted to the screw, driving the screw to rotate; by setting a vertical limiting hole on the lower ratchet sleeve and the limiting sleeve, which cooperates with a limiting pin, the vertical movement distance of the lower ratchet sleeve and the limiting sleeve is limited; the cooperation relationship between the limiting hole and the limiting pin makes the structure of the device simpler, which helps to reduce manufacturing 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 hole on the lower ratchet sleeve and the limiting sleeve.

[0017] Beneficial effects: It helps to ensure that when the upper ratchet sleeve is rotated to or about to be rotated to the position, the ratchet teeth of the upper ratchet sleeve will be fully engaged with the ratchet teeth of the lower ratchet sleeve to generate a preload force, and apply a force to the limiting sleeve, so that it abuts against the end face of the threaded sleeve and generates friction between them.

[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: Ensures that the limiting sleeve can move smoothly in the vertical direction and avoids jamming between the limiting hole and the limiting pin.

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

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

[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 effects: The elongated limiting hole on the upper ratchet sleeve reduces its strength and makes it prone to damage during actual use. Increasing the diameter of the upper ratchet sleeve helps to improve its strength and thus extend its service life.

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

[0025] Beneficial effects: The protective sleeve is used to protect the end face of the threaded sleeve to avoid problems such as friction, wear, scratches and abrasions between the limiting sleeve and the threaded sleeve when the sleeve rotates.

[0026] Preferably, as an improvement, the top of the upper ratchet sleeve is also provided with a connecting post for cooperating with a tightening wrench. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the tightening of existing threaded sleeves;

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

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

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

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

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

[0033] Figure 7 This is a schematic diagram of the structure in Example 3. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: workpiece 100, threaded hole 101, threaded sleeve 200, preload nut 201, screw 1, upper ratchet sleeve 2, ratchet tooth 20, first limiting hole 21, connecting post 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 sleeve 6, stepped hole 60, frame 7, lifting assembly 71, rotating assembly 72, and mounting sleeve 73.

[0036] Example 1

[0037] like Figure 2-4 As shown, the screw sleeve tightening tool includes a screw 1 and an auxiliary anti-reverse assembly sleeved on the screw 1. The auxiliary anti-reverse assembly includes an upper ratchet sleeve 2 and a lower ratchet sleeve 3 that cooperate with each other, and a limiting sleeve 4 for abutting against the end face of the screw sleeve 200. The upper ratchet sleeve 2 and the lower ratchet sleeve 3 are engaged by ratchet teeth 20. In this embodiment, more preferably, the diameter of the upper ratchet sleeve 2 is larger than the diameter of the lower ratchet sleeve 3, and the ratchet teeth 20 of the upper ratchet sleeve 2 are larger than the ratchet teeth 20 of the lower ratchet sleeve 3, which is beneficial to improving the strength of the upper ratchet sleeve 2. The upper ratchet sleeve 2 is sleeved on the top of the screw 1 and can rotate around the circumference of the screw 1. The screw 1 is also provided with a limiting member for limiting the rotation angle of the upper ratchet sleeve 2. The lower ratchet sleeve 3 and the limiting sleeve 4 are slidably sleeved on the screw 1 through the limiting member. The limiting member is used to limit the vertical movement distance of the lower ratchet sleeve 3 and the limiting sleeve 4.

[0038] Specifically, in this embodiment, the limiting component is a limiting pin 5, which passes through the screw 1. The upper ratchet sleeve 2, lower ratchet sleeve 3, and limiting sleeve 4 are all provided with elongated limiting holes. The free ends of the three sets of limiting pins 5 extend into their respective limiting holes, and the limiting holes and limiting pins 5 are slidably connected. The limiting holes on the upper ratchet sleeve 2 are arranged along the circumference of the upper ratchet sleeve 2, while the limiting holes on the lower ratchet sleeve 3 and limiting sleeve 4 are arranged vertically. During installation, each component is first fitted, and then the limiting pins 5 are driven in sequentially. The limiting pins 5 are tightened and connected to the pin holes provided on the screw 1, and after installation, the axes of the three sets of limiting pins 5 are on the same vertical plane.

[0039] For ease of distinction, in this embodiment, the three sets of limiting pins 5 and limiting holes are referred to from top to bottom as the first limiting pin 51, the first limiting hole 21, the second limiting pin 52, the second limiting hole 31, and the third limiting pin 53, the third limiting hole 41. In this embodiment, the length of the first limiting hole 21 on the upper ratchet sleeve 2 is greater than or equal to the length of the second limiting hole 31 on the lower ratchet sleeve 3 and the third limiting hole 41 on the limiting sleeve 4. The width of the third limiting hole 41 on the limiting sleeve 4 is greater than the diameter of the third limiting pin 53, ensuring that the limiting sleeve 4 can move smoothly in the vertical direction and preventing the third limiting hole 41 from jamming with the third limiting pin 53, which would prevent the preload from being released.

[0040] The bottom of the limiting sleeve 4 is also provided with a protective sleeve 6, specifically, the protective sleeve 6 is made of nylon; such as Figure 5-6 As shown, the lower end of the limiting sleeve 4 is provided with a boss 40, and the lower end of the limiting sleeve 4 is also provided with an annular groove 42, which separates the boss 40. The protective sleeve 6 is provided with a stepped hole 60 for cooperating with the boss 40. 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 threaded sleeve 200 to avoid friction, wear, scratches or other problems caused by direct contact between the limiting sleeve 4 and the threaded sleeve 200 when the limiting sleeve 4 rotates.

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

[0042] Specifically, the usage method of the threaded insert tightening tool is as follows:

[0043] When tightening the screw sleeve 200 is required, first screw the lower end of the screw 1 into the internal thread of the screw sleeve 200, and screw the screw sleeve 200 into the threaded hole 101 of the workpiece 100 to be assembled. Then, install tightening tools 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 are engaged through 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 engages 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 limit sleeve 4 to move downward and 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 preload force. At this time, the upper ratchet sleeve 2, the lower ratchet sleeve 3, and the limit sleeve 4 are fully engaged, forming a backstop component that can prevent the screw sleeve 200 from moving backward.

[0044] Then continue rotating the upper ratchet sleeve 2. Due to the action of the limiting pin 5, the upper ratchet sleeve 2 does not move relative to the screw 1 during rotation. Instead, under the action of the limiting pin 5, it transmits the rotational torque to the screw 1, causing the screw 1 to rotate. Under the action of the anti-reverse 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 fully screwed into the threaded hole 101, rotate the upper ratchet sleeve 2 in the opposite direction. At this time, the ratchet teeth 20 of the upper ratchet sleeve 2 gradually disengage from the ratchet teeth 20 of the lower ratchet sleeve 3, thus... The preload 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 disengage from each other, thereby creating a gap between the limiting sleeve 4 and the end face of the threaded sleeve 200, releasing the friction between the limiting sleeve 4 and the threaded sleeve 200, so that no preload is generated between the screw 1 and the threaded sleeve 200; then the upper ratchet sleeve 2 continues to rotate in the opposite direction until the upper ratchet sleeve 2 is restricted by the limiting pin 5, and under the action of the limiting pin 5, the screw 1 is driven to rotate in the opposite direction, thereby causing the screw 1 to gradually withdraw from the threaded sleeve 200, completing the assembly of the threaded sleeve 200.

[0045] The threaded sleeve tightening tool provided in this application does not require an additional preload nut 201 for preventing backlash during tightening. When the upper ratchet sleeve 2 and lower ratchet sleeve 3 generate preload, the limiting sleeve 4 abuts against the end face of the threaded sleeve 200 to form a backlash prevention component, which assists in screwing the threaded sleeve 200 into the threaded hole 101 of the workpiece. When it is necessary to remove the tightening tool, it is only necessary to rotate in the opposite direction to release the preload between the upper ratchet sleeve 2 and lower ratchet sleeve 3, thereby releasing the preload between the screw 1 and the threaded sleeve 200. This solves the problem of pulling out the already tightened threaded sleeve 200 again when removing the screw 1. Moreover, the tightening tool has a simple structure and is easy to operate. It does not require manual removal of the preload between the screw 1 and the threaded sleeve 200, thus improving assembly efficiency.

[0046] Example 2

[0047] This embodiment also provides a screw sleeve tightening device for a gearbox housing, including a screw sleeve tightening tool for installing the screw sleeve into the internal threaded hole of the gearbox housing; it also includes a body, on which an installation station and a frame are provided, the frame being located above the installation station, the screw sleeve tightening tool being disposed on the frame, and the installation station being used to fix the gearbox housing.

[0048] Example 3

[0049] This embodiment also provides a frame for mounting a threaded 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 mounted 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 mounted on the mounting sleeve 73, and the screw thread tightening tool is rotatably connected to the mounting sleeve 73. The power output end of the rotating assembly 72 is used to drive the upper ratchet sleeve 2 of the screw thread tightening tool to rotate.

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

[0051] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A screw thread tightening tool, characterized in that: The device includes a screw and an auxiliary anti-reverse assembly fitted on the screw. The auxiliary anti-reverse assembly includes an upper ratchet sleeve, a lower ratchet sleeve, and a limiting sleeve for abutting against the end face of the screw sleeve. The upper ratchet sleeve and the lower ratchet sleeve are engaged by ratchet teeth. The upper ratchet sleeve is fitted on the top of the screw and can rotate around the circumference of the screw. The screw is also provided with a limiting member for limiting the rotation angle of the upper ratchet sleeve. The lower ratchet sleeve and the limiting sleeve are slidably fitted on the screw through the limiting member. The limiting member is used to limit the vertical movement distance of the lower ratchet sleeve and the limiting sleeve.

2. The threaded sleeve tightening tool according to claim 1, characterized in that: The limiting component is a limiting pin, which passes through the screw. The upper ratchet sleeve, lower ratchet sleeve, and limiting sleeve are all provided with elongated limiting holes. The free ends of the three sets of limiting pins extend into their respective limiting holes, and the limiting holes and limiting pins are slidably connected. The limiting holes on the upper ratchet sleeve are arranged along the circumference of the upper ratchet sleeve, while the limiting holes on the lower ratchet sleeve and 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 hole 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 sets of limit pins are on the same vertical plane.

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

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

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 post for cooperating with a tightening wrench.

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