Small torque self-fixing tightening mechanism

Abstract

The utility model relates to tightening mechanism technical field, concretely is a small torque self -fixing tightening mechanism, including drive mechanism shell, the drive mechanism shell bottom is fixed with the locating sleeve, the opposite end face of rotating sleeve and drive mechanism shell is fixed with the outer hexagonal joint, the hexagonal rod bottom end is through rotating sleeve and through -hole extension setting in the outside dynamic sleeve in -side, the hexagonal rod bottom end is provided with the inner stop sleeve, in the utility model, the hexagonal end of screw fastening process will produce the friction with work piece in the fastening process of nut, and cooperate in the auxiliary fixing of inner stop sleeve to screw and carry out the positioning under the bolt, and then make the nut to tighten, can be completed without the aid of other tools, improve work efficiency, improve product quality, adopt low noise motor drive, reduce the generation of noise, improve the working environment of operating personnel.

Description

Technical Field

[0001] This utility model relates to the field of tightening mechanism technology, specifically a small torque self-fixing tightening mechanism. Background Technology

[0002] In the field of mechanical engineering, the tightening of bolts and nuts is a core process to ensure the stability of component assembly. Since both bolts and nuts are in a movable state during the initial assembly stage, one component must be forcibly fixed by external tools before applying rotational torque to the other component to achieve tightening.

[0003] Currently, the most mainstream solution in the industry is to use a combination of a fork wrench and an air gun. The operator needs to hold the fork wrench in one hand, locking it against the edge of the bolt head, applying force to ensure the bolt is completely fixed. The other hand holds the pneumatic tightening gun, placing the gun's sleeve onto the corresponding nut. Activating the air gun uses high-pressure airflow to drive the sleeve to rotate, tightening the nut along the bolt threads. However, because the air gun relies on high-pressure airflow, its operation is extremely noisy, and long-term exposure can damage the operator's hearing. Furthermore, the noisy environment can easily interfere with communication during operation. The bolt fixing effect also depends entirely on the operator's hand strength. If the strength is insufficient, the bolt may rotate synchronously with the nut during tightening, resulting in insufficient tightening torque and affecting the assembly quality of automotive parts. If the strength is excessive, it may cause wear on the bolt head edges, making subsequent disassembly difficult. In addition, the operation requires coordinated use of both hands, demanding a high level of operator skill. Moreover, when working in confined spaces such as under a car chassis, using both hands is difficult, significantly reducing assembly efficiency. Therefore, to address these issues, a low-torque self-locking tightening mechanism is proposed. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, and addressing the problems of loud noise during operation of the air gun, uncontrollable tightening quality, and inconvenience of two-handed operation, this utility model proposes a low-torque self-fixing tightening mechanism.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The small torque self-fixing tightening mechanism of this utility model includes a drive mechanism housing, a positioning sleeve is fixedly fixed through the bottom of the drive mechanism housing, a rotating sleeve is rotatably arranged inside the positioning sleeve, an external hexagonal connector is fixedly connected to the end face of the rotating sleeve opposite to the drive mechanism housing, a through hole with the same diameter as the middle hole of the rotating sleeve is opened through the external hexagonal connector, and an external movable sleeve is provided on the outside of the external hexagonal connector to fit and engage with it;

[0006] The top of the drive mechanism housing is fixed with an internal hexagonal sleeve, and a hexagonal rod is slidably disposed inside the internal hexagonal sleeve. The bottom end of the hexagonal rod extends through both the rotating sleeve and the through hole and is disposed inside the outer moving sleeve. An inner stop sleeve is provided at the bottom end of the hexagonal rod.

[0007] Preferably, the inner wall of the inner stop sleeve is provided with anti-slip mesh, and the inner opening of the inner stop sleeve is interference-fitted with the end of the screw.

[0008] Preferably, a first baffle is fixed to the top of the hexagonal rod, and the first baffle is located above the inner hexagonal sleeve. A second baffle is fixed to the middle section of the hexagonal rod, and the second baffle is located inside the drive mechanism housing and above the rotating sleeve.

[0009] Preferably, a spring is sleeved on the outer side of the hexagonal rod, and the spring is located between the upper part of the second baffle and the top of the drive mechanism housing.

[0010] Preferably, a first helical gear is fixedly connected to the upper part of the rotating sleeve and outside the second baffle. A drive motor is fixed inside the housing of the drive mechanism. The output end of the drive motor is fixed with a second helical gear, and the second helical gear is meshed and connected to the first helical gear for transmission.

[0011] Preferably, the end of the hexagonal rod located inside the outer movable sleeve is provided with a insertion groove, and a positioning rib groove is provided on one side wall of the insertion groove, and a No. 1 magnet is fixed on the inner wall of the insertion groove.

[0012] Preferably, an insertion block is fixedly connected to the inner stop sleeve, and a positioning rib that slides into the positioning rib groove is fixedly connected to the side wall of the insertion block. The insertion block is inserted into the insertion groove, and a second magnet that is magnetically attracted to the first magnet is fixedly connected to the end of the insertion block.

[0013] The advantages of this utility model are:

[0014] 1. This utility model utilizes the fact that during the bolt tightening process, the hexagonal end of the bolt will rub against the workpiece during the tightening of the nut, and with the assistance of the inner stop sleeve to fix the bolt, the nut can be tightened. This can be done without the need for other tools, improving work efficiency and product quality.

[0015] 2. This utility model uses a low-noise motor drive, and the inner stop rod and bolt, and the outer moving head and nut are in surface contact rather than point-line friction. There is no additional impact or airflow noise during rotation, which significantly improves the working environment of the operator. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first three-dimensional structure in this embodiment;

[0018] Figure 2 This is a cross-sectional enlarged schematic diagram of the main structure of the drive mechanism housing in this embodiment;

[0019] Figure 3 This is a cross-sectional enlarged schematic diagram of the main structure of the rotating sleeve in this embodiment;

[0020] Figure 4 This is an enlarged schematic diagram of the main structure of the insertion slot in this embodiment;

[0021] Figure 5 This is a cross-sectional enlarged schematic diagram of the main structure of the inner stop sleeve in this embodiment;

[0022] Figure 6 This is an enlarged schematic diagram of area A in the cross-sectional view of the rotating sleeve main structure in this embodiment.

[0023] In the diagram: 1. Drive mechanism housing; 2. Positioning sleeve; 3. Rotating sleeve; 4. External hexagonal connector; 5. Through hole; 6. Helical gear No. 1; 7. Helical gear No. 2; 8. Internal hexagonal sleeve; 9. Hexagonal rod; 10. Internal stop sleeve; 11. Baffle No. 1; 12. Baffle No. 2; 13. Spring; 14. External moving sleeve; 15. Insertion groove; 16. Magnet No. 1; 17. Positioning rib groove; 18. Insertion block; 19. Magnet No. 2; 20. Positioning rib; 21. Drive motor. Detailed Implementation

[0024] 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 scope of protection of the present utility model.

[0025] Please see Figure 1-6As shown, a small torque self-fixing tightening mechanism includes a drive mechanism housing 1. A positioning sleeve 2 is fixedly fixed through the bottom of the drive mechanism housing 1. A rotating sleeve 3 is rotatably disposed inside the positioning sleeve 2. An external hexagonal connector 4 is fixedly connected to the end face of the rotating sleeve 3 opposite to the drive mechanism housing 1. A through hole 5 with the same diameter as the middle hole of the rotating sleeve 3 is opened through the external hexagonal connector 4. An external movable sleeve 14 is disposed on the outside of the external hexagonal connector 4 and engages with it.

[0026] The top of the drive mechanism housing 1 is fixed with an internal hexagonal sleeve 8. A hexagonal rod 9 is slidably disposed inside the internal hexagonal sleeve 8. The bottom end of the hexagonal rod 9 extends through the rotating sleeve 3 and the through hole 5 and is disposed inside the outer moving sleeve 14. An inner stop sleeve 10 is disposed at the bottom end of the hexagonal rod 9.

[0027] The inner wall of the inner stop sleeve 10 is provided with anti-slip mesh, and the inner opening of the inner stop sleeve 10 is interference-fitted with the end of the screw.

[0028] A first baffle 11 is fixed to the top of the hexagonal rod 9, and the first baffle 11 is located above the inner hexagonal sleeve 8. A second baffle 12 is fixed to the middle section of the hexagonal rod 9, and the second baffle 12 is located inside the drive mechanism housing 1 and above the rotating sleeve 3.

[0029] A spring 13 is sleeved on the outside of the hexagonal rod 9, and the spring 13 is located between the upper part of the second baffle 12 and the top of the inner part of the drive mechanism housing 1.

[0030] A first helical gear 6 is fixedly connected to the upper part of the rotating sleeve 3 and outside the second baffle 12. A drive motor 21 is fixed inside the drive mechanism housing 1. A second helical gear 7 is fixed to the output end of the drive motor 21, and the second helical gear 7 is meshed and connected to the first helical gear 6.

[0031] The end of the hexagonal rod 9 located inside the outer movable sleeve 14 is provided with a insertion groove 15. A positioning rib groove 17 is provided on one side wall of the insertion groove 15. A magnet 16 is fixed on the inner wall of the insertion groove 15.

[0032] An insertion block 18 is fixedly connected to the inner stop sleeve 10. A positioning rib 20 that slides into the positioning rib groove 17 is fixedly connected to the side wall of the insertion block 18. The insertion block 18 is inserted into the insertion groove 15. A second magnet 19 that is magnetically attracted to the first magnet 16 is fixedly connected to the end of the insertion block 18.

[0033] During operation, due to the problems of loud noise from the air gun, uncontrollable tightening quality, and inconvenience of two-handed operation in the existing technology, in this solution, in the initial state, the spring 13 will always push the second baffle 12 downward so that the hexagonal rod 9 extends downward into the outer moving sleeve 14 and the first baffle 11 fits against the upper part of the inner hexagonal sleeve 8.

[0034] In use, the plug block 18 is inserted into the plug slot 15, and the positioning rib 20 and positioning rib slot 17 engage to prevent mis-slip. The inner stop sleeve 10 is installed using the magnetic attraction of magnet 16 and magnet 19. The outer moving sleeve 14 is then fitted onto the outside of the outer hexagonal connector 4, completing the preparation. Select the outer moving sleeve 14 that matches the bolt type and nut, and the inner stop sleeve 10 that matches the bolt end diameter. First, pass the bolt through the workpiece and tighten the nut onto the bolt. Then, place the inner stop sleeve 10 onto the end of the screw, utilizing the anti-slip texture of the inner wall of the inner stop sleeve 10. The screw is initially fixed by an interference fit, and the outer movable sleeve 14 is fitted onto the outside of the nut. Then, the drive motor 21 is controlled to drive the second helical gear 7. Under the meshing transmission of the second helical gear 7 and the first helical gear 6, the rotating sleeve 3 is driven to rotate inside the positioning sleeve 2. Under the drive of the outer hexagonal joint 4 on the outer movable sleeve 14, the nut rotates on the bolt, so that the nut and the bolt cooperate to fasten the workpiece. During the tightening process, the hexagonal end of the bolt will rub against the workpiece during the tightening process of the nut. With the help of the inner stop sleeve 10 to fix the bolt, the nut is positioned, thereby tightening the nut.

[0035] In addition, the nut will move during the tightening of the bolt. In order to keep the outer sleeve 14 connected to the nut, the bolt being tightened will push the hexagonal rod 9 upward during tightening. When the hexagonal rod 9 moves, it will drive the second baffle 12 to press the spring 13 upward, so that the spring 13 will contract and the hexagonal rod 9 will extend upward to the inner hexagonal sleeve 8, thus completing the tightening of the bolt.

[0036] The magnetic attraction of magnet 16 and magnet 19 makes it easy to disassemble the inner stop sleeve 10, so as to replace the inner stop sleeve 10 with different specifications and models, thereby improving the ease of use and applicability.

[0037] This mechanism can automatically secure bolts or nuts, tightening them automatically without the need for other tools, thus improving work efficiency and product quality. Furthermore, the mechanism is driven by a low-noise motor, and the inner stop rod and bolt, as well as the outer moving head and nut, make surface contact rather than point-line friction, resulting in no additional impact or airflow noise during rotation, significantly improving the working environment for operators.

[0038] The design achieves the purpose of tightening bolts, solving the problem of inconvenience in two-handed operation. After modification, it can be completed with one hand, improving the tightening quality of the product, reducing noise, and improving the working environment for operators.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A low-torque self-locking tightening mechanism, characterized in that: The device includes a drive mechanism housing (1), a positioning sleeve (2) is fixedly inserted through the bottom of the drive mechanism housing (1), a rotating sleeve (3) is rotatably disposed inside the positioning sleeve (2), an external hexagonal connector (4) is fixedly connected to the end face of the rotating sleeve (3) opposite to the drive mechanism housing (1), a through hole (5) with the same diameter as the middle hole of the rotating sleeve (3) is opened through the external hexagonal connector (4), and an external movable sleeve (14) is provided on the outside of the external hexagonal connector (4) to fit and engage with it; The top of the drive mechanism housing (1) is fixed with an internal hexagonal sleeve (8), and a hexagonal rod (9) is slidably disposed inside the internal hexagonal sleeve (8). The bottom end of the hexagonal rod (9) extends through the rotating sleeve (3) and the through hole (5) and is disposed inside the outer moving sleeve (14). An inner stop sleeve (10) is provided at the bottom end of the hexagonal rod (9).

2. The low-torque self-locking tightening mechanism according to claim 1, characterized in that: The inner wall of the inner stop sleeve (10) is provided with anti-slip mesh, and the inner opening of the inner stop sleeve (10) is interference-fitted with the end of the screw.

3. The low-torque self-locking tightening mechanism according to claim 1, characterized in that: A first baffle (11) is fixed to the top of the hexagonal rod (9), and the first baffle (11) is located above the inner hexagonal sleeve (8). A second baffle (12) is fixed to the middle section of the hexagonal rod (9), and the second baffle (12) is located inside the drive mechanism housing (1) and above the rotating sleeve (3).

4. The low-torque self-locking tightening mechanism according to claim 1, characterized in that: A spring (13) is sleeved on the outside of the hexagonal rod (9), and the spring (13) is located between the upper part of the second baffle (12) and the top of the inner part of the drive mechanism housing (1).

5. The low-torque self-locking tightening mechanism according to claim 1, characterized in that: A first helical gear (6) is fixedly connected to the upper part of the rotating sleeve (3) and outside the second baffle (12). A drive motor (21) is fixed inside the housing (1) of the drive mechanism. A second helical gear (7) is fixed at the output end of the drive motor (21), and the second helical gear (7) is meshed and connected to the first helical gear (6).

6. The low-torque self-locking tightening mechanism according to claim 1, characterized in that: The end of the hexagonal rod (9) located inside the outer movable sleeve (14) is provided with a insertion groove (15), and a positioning rib groove (17) is provided on one side wall of the insertion groove (15). A magnet (16) is fixed on the inner wall of the insertion groove (15).

7. The low-torque self-locking tightening mechanism according to claim 1, characterized in that: An insertion block (18) is fixedly connected to the inner stop sleeve (10). A positioning rib (20) that slides into the positioning rib groove (17) is fixedly connected to the side wall of the insertion block (18). The insertion block (18) is inserted into the insertion groove (15). A second magnet (19) that is magnetically attracted to the first magnet (16) is fixedly connected to the end of the insertion block (18).

Images