Nut tightening mechanism and nut tightening apparatus

Abstract

The utility model relates to nut tightening equipment technical field, concretely is a nut tightening mechanism and nut tightening equipment, include: pre -tightening axle, pre -tightening head, pre -tightening axle bottom end center connection is provided with transmission key, pre -tightening head top end center is provided with the keyway, transmission key and keyway adaptive plug -in setting, the both sides wall of keyway is provided with the positioning slot symmetry, pre -tightening head is set up on pre -tightening axle through installation component, through the elastic linkage structure of L type and ladder type push plate, do not need to help wrench, screwdriver etc.

Description

Technical Field

[0001] This utility model relates to the technical field of nut tightening equipment, specifically a nut tightening mechanism and nut tightening equipment. Background Technology

[0002] Chinese patent document CN219404090U discloses a nut pre-tightening mechanism, including an outer mounting sleeve, an inner mounting sleeve rotatably connected to the upper inner side of the outer mounting sleeve, a pre-tightening shaft slidably connected axially to the inner side of the inner mounting sleeve, the lower end of the pre-tightening shaft passing through the outer mounting sleeve and connected to a pre-tightening head, the pre-tightening head having a nut clamping structure, a spring installed between the pre-tightening shaft and the inner mounting sleeve, and a rotary drive assembly connected to the upper end of the outer mounting sleeve, the rotary drive assembly being connected to the inner mounting sleeve. The nut pre-tightening mechanism of this invention can automatically pre-tighten the nut onto the screw, facilitating automation, effectively reducing labor intensity and improving work efficiency.

[0003] However, in the above-mentioned solutions and existing technologies, the pre-tightening head in the nut tightening equipment is connected to the pre-tightening shaft by a pin and screw. In industrial production, it is often necessary to frequently switch between different specifications of nuts for assembly, and correspondingly, different pre-tightening heads need to be assembled. When disassembling and assembling the pre-tightening head, auxiliary tools such as wrenches and screwdrivers are required. The pin and screw must be removed first to separate the pre-tightening head from the pre-tightening shaft, making the operation steps cumbersome.

[0004] Therefore, this utility model proposes a nut tightening mechanism and nut tightening equipment to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a nut tightening mechanism and nut tightening equipment to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a nut tightening mechanism and a nut tightening device, comprising: a pre-tightening shaft and a pre-tightening head, wherein a transmission key is connected to the center of the bottom end of the pre-tightening shaft, and a keyway is provided at the center of the top end of the pre-tightening head, and the transmission key is adapted to be inserted into the keyway; positioning slots are symmetrically provided on both sides of the keyway, and the pre-tightening head is mounted on the pre-tightening shaft through an installation component.

[0007] Preferably, the mounting assembly includes a movable groove, an L-shaped lever, a positioning block, a trapezoidal push plate, and a screw sleeve. The movable groove is formed inside the transmission key, and two L-shaped levers are symmetrically and movably engaged inside the movable groove, with the ends of the L-shaped levers extending out of the side wall of the transmission key.

[0008] Preferably, a positioning block is connected to the inner side wall of the L-shaped dial plate, the end of the positioning block extends out of the side wall of the transmission key and is inserted into the positioning slot, and a limit block is connected to the center of the side wall of the movable slot, the limit block abutting against the side end of the L-shaped dial plate.

[0009] Preferably, a receiving groove is provided on the top wall of the movable groove, and a trapezoidal push plate is movably engaged in the receiving groove. A spring is connected to the top of the trapezoidal push plate, and the other end of the spring is connected to the top wall of the receiving groove.

[0010] Preferably, the bottom end of the trapezoidal push plate is symmetrically provided with two inclined surfaces, the inclined surface of the bottom end of the trapezoidal push plate contacts the corner of the L-shaped push plate, the corner of the L-shaped push plate is set with an arc surface, the side wall of the L-shaped push plate is provided with an insertion hole, and the pre-tightening shaft peripheral wall is provided with an external thread.

[0011] Preferably, the external threaded connection is provided with a threaded sleeve, a rotating ring is rotatably provided on the peripheral wall of the threaded sleeve, two inserts are symmetrically connected on the bottom wall of the rotating ring, the inserts are inserted into the insertion holes, and a limiting ring is fixedly sleeved on the peripheral wall of the pre-tightened shaft, the limiting ring being located above the threaded sleeve.

[0012] A nut tightening device includes the aforementioned nut tightening mechanism.

[0013] Compared with the prior art, the beneficial effects of this utility model are: With the elastic linkage structure of the L-shaped lever and the trapezoidal push plate, the pre-tightening head can be installed and removed without the need for auxiliary tools such as wrenches and screwdrivers. Simply press the lever and rotate the screw sleeve manually to complete the locking and separation. The operation steps are simplified, the replacement time of the pre-tightening head is greatly shortened, and it can meet the needs of frequent specification switching in industrial production, thereby improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the pre-tightening head structure connection of this utility model; Figure 3 This is a schematic diagram of the pre-tightening shaft structure connection of this utility model; Figure 4 This is a half-sectional view of the pre-tightening shaft structure connection of this utility model.

[0015] In the diagram: 1. Pre-tightening shaft; 2. Pre-tightening head; 3. Transmission key; 4. Keyway; 5. Positioning slot; 6. Movable slot; 7. L-shaped lever; 8. Positioning insert; 9. Limiting block; 10. Receiving slot; 11. Trapezoidal push plate; 12. Spring; 13. Insertion hole; 14. External thread; 15. Screw sleeve; 16. Rotary ring; 17. Insertion post; 18. Limiting ring. Detailed Implementation

[0016] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] Please see Figures 1-4 This utility model provides a technical solution: a nut tightening mechanism and nut tightening equipment, including: a pre-tightening shaft 1 and a pre-tightening head 2. A transmission key 3 is connected to the center of the bottom end of the pre-tightening shaft 1, and a keyway 4 is opened at the center of the top end of the pre-tightening head 2. The transmission key 3 and the keyway 4 are adapted to be inserted into each other. Positioning slots 5 are symmetrically opened on both sides of the keyway 4. The pre-tightening head 2 is mounted on the pre-tightening shaft 1 through a mounting component.

[0018] The pre-tightening shaft 1 serves as the power transmission and installation base, with a transmission key 3 fixedly connected to the center of its bottom end for torque transmission and positioning; the pre-tightening head 2 serves as the nut tightening actuator, with a keyway 4 at the center of its top end that matches the transmission key 3, enabling positioning and insertion with the pre-tightening shaft 1.

[0019] The movable slot 6 in the installation assembly is opened in the transmission key 3. Two L-shaped levers 7 are symmetrically and movably engaged in the movable slot 6, and the ends of the L-shaped levers 7 extend out of the side wall of the transmission key 3.

[0020] A positioning block 8 is connected to the inner wall of the L-shaped dial 7. The end of the positioning block 8 extends out of the side wall of the transmission key 3 and is inserted into the positioning slot 5. A limit block 9 is connected to the center of the side wall of the movable slot 6 and abuts against the side end of the L-shaped dial 7.

[0021] Two L-shaped levers 7 are provided, symmetrically and movably engaged in the movable slot 6. The ends of the L-shaped levers 7 extend out of the side wall of the transmission key 3 for easy manual pressing operation. The inner side wall of the L-shaped levers 7 is fixedly connected to the positioning plug 8 for insertion into the positioning slot 5. The limiting block 9 plays a lateral limiting role for the L-shaped levers 7 to prevent excessive sliding.

[0022] The top wall of the movable groove 6 is provided with a receiving groove 10. A trapezoidal push plate 11 is movably engaged in the receiving groove 10. A spring 12 is connected to the top of the trapezoidal push plate 11, and the other end of the spring 12 is connected to the top wall of the receiving groove 10.

[0023] The trapezoidal push plate 11 is movably engaged in the receiving groove 10, and its top end is connected to the top wall of the receiving groove 10 through a spring 12. The spring 12 is in a compressed state, and when the spring 12 is reset, it provides a downward pushing force to the trapezoidal push plate 11.

[0024] The trapezoidal push plate 11 has two symmetrical inclined surfaces at its bottom end. The inclined surface at the bottom end of the trapezoidal push plate 11 contacts the corner of the L-shaped dial plate 7. The corner of the L-shaped dial plate 7 is set with an arc surface. An insertion hole 13 is opened on the side wall of the L-shaped dial plate 7. An external thread 14 is provided on the circumferential wall of the pre-tightening shaft 1.

[0025] The bottom end of the trapezoidal push plate 11 is symmetrically provided with inclined surfaces. The inclined surfaces of the trapezoidal push plate 11 contact the curved surface of the L-shaped lever plate 7 to realize the lateral transmission of force and push the L-shaped lever plate 7 to move.

[0026] The external thread 14 is threadedly connected to a threaded sleeve 15. A rotating ring 16 is rotatably mounted on the circumferential wall of the threaded sleeve 15. Two inserts 17 are symmetrically connected on the bottom wall of the rotating ring 16. The inserts 17 are inserted into the insertion holes 13. A limiting ring 18 is fixedly sleeved on the circumferential wall of the pre-tightening shaft 1. The limiting ring 18 is located above the threaded sleeve 15.

[0027] The pre-tightening shaft 1 has an external thread 14 on its circumferential wall for installing the screw sleeve 15. The pre-tightening shaft 1 also has a limiting ring 18 fixedly fitted on its circumferential wall. The limiting ring 18 is located above the screw sleeve 15 and restricts the displacement of the screw sleeve 15. The screw sleeve 15 has a rotating ring 16 fitted on its circumferential wall. When the screw sleeve rotates, the rotating ring only moves axially. The bottom wall of the rotating ring 16 has two symmetrically connected inserts 17 that are adapted to the insertion holes 13 and are used to limit the displacement of the L-shaped dial plate 7.

[0028] Working principle: Align the keyway 4 of the pre-tightening head 2 with the transmission key 3 of the pre-tightening shaft 1, and insert it axially until the top of the pre-tightening head 2 and the bottom of the pre-tightening shaft 1 are in contact, providing basic positioning for subsequent positioning and locking. At the same time, the cooperation between the transmission key 3 and the keyway 4 ensures the accuracy of torque transmission. During the insertion of the transmission key 3 into the keyway 4, it pushes the two L-shaped levers 7 to slide inward along the movable groove 6. The angled arc surface of the L-shaped lever 7 moves along the inclined surface of the trapezoidal push plate 11, thereby pushing the trapezoidal push plate 11 to move upward and compress the spring 12. When the top of the pre-tightening head 2 is in contact with the bottom of the pre-tightening shaft 1, the L-shaped levers 7 are released. Under the elastic force of the spring 12 returning to its original position, the trapezoidal push plate 11 extends downward into the receiving groove 10. Its bottom symmetrical inclined surface contacts the angled arc surface of the L-shaped lever 7 and applies a lateral thrust, pushing the two L-shaped levers 7 to slide to both sides along the movable groove 6. The L-shaped levers 7 drive the positioning blocks 8 on the inner wall to move synchronously. The positioning insert 8 extends out of the side wall of the transmission key 3 and is precisely inserted into the positioning slots 5 on both sides of the keyway 4, completing the initial locking of the pre-tightening head 2 and the pre-tightening shaft 1. Then, the screw sleeve 15 is rotated to move downward along the external thread 14, causing the rotating ring 16 and the insert 17 to move downward, so that the insert 17 is inserted into the insertion hole 13 of the L-shaped dial plate 7, completing the secondary locking and further locking the connection state between the positioning insert 8 and the positioning slot 5, ensuring that the locking structure is stable and reliable. When disassembling the pre-tightening head 2, the screw sleeve 15 is rotated in the opposite direction to move upward along the external thread 14. The insert 17 moves upward with the rotating ring 16 and disengages from the insertion hole 13. The ends of the L-shaped dial plate 7 extending on both sides are pressed inward by hand, and the L-shaped dial plate 7 slides inward. The positioning insert 8 is retracted into the transmission key 3 and disengaged from the positioning slot 5. At the same time, the trapezoidal push plate 11 is squeezed and compressed by the spring 12 and retracted into the placement groove 10. The pre-tightening head 2 is pulled out axially downward to complete the disassembly.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nut tightening mechanism, comprising: The pre-tightening shaft (1) and the pre-tightening head (2) are provided with a transmission key (3) at the bottom center of the pre-tightening shaft (1) and a keyway (4) at the top center of the pre-tightening head (2). The transmission key (3) and the keyway (4) are adapted to be inserted into each other. The keyway (4) is characterized by having symmetrically provided positioning slots (5) on both sides of the keyway (4), and the pre-tightening head (2) is mounted on the pre-tightening shaft (1) by means of the mounting assembly.

2. The nut tightening mechanism according to claim 1, characterized in that: The installation assembly includes a movable groove (6), an L-shaped lever (7), a positioning block (8), a trapezoidal push plate (11), and a screw sleeve (15). The movable groove (6) is opened in the transmission key (3). Two L-shaped levers (7) are symmetrically and movablely engaged in the movable groove (6). The ends of the L-shaped levers (7) extend out of the side wall of the transmission key (3).

3. The nut tightening mechanism according to claim 2, characterized in that: A positioning block (8) is connected to the inner wall of the L-shaped dial (7). The end of the positioning block (8) extends out of the side wall of the transmission key (3) and is inserted into the positioning slot (5). A limit block (9) is connected to the center of the side wall of the movable slot (6). The limit block (9) abuts against the side end of the L-shaped dial (7).

4. The nut tightening mechanism according to claim 3, characterized in that: The top wall of the movable groove (6) is provided with a receiving groove (10), and a trapezoidal push plate (11) is movably engaged in the receiving groove (10). A spring (12) is connected to the top of the trapezoidal push plate (11), and the other end of the spring (12) is connected to the top wall of the receiving groove (10).

5. A nut tightening mechanism according to claim 4, characterized in that: The trapezoidal push plate (11) has two symmetrical inclined surfaces at the bottom end. The inclined surface at the bottom end of the trapezoidal push plate (11) contacts the corner of the L-shaped push plate (7). The corner of the L-shaped push plate (7) is set with an arc surface. An insertion hole (13) is opened on the side wall of the L-shaped push plate (7). An external thread (14) is set on the peripheral wall of the pre-tightening shaft (1).

6. A nut tightening mechanism according to claim 5, characterized in that: The external thread (14) is threaded and connected with a threaded sleeve (15). A rotating ring (16) is rotatably arranged on the circumferential wall of the threaded sleeve (15). Two inserts (17) are symmetrically connected on the bottom wall of the rotating ring (16). The inserts (17) are inserted into the insertion hole (13). A limiting ring (18) is fixedly sleeved on the circumferential wall of the pre-tightening shaft (1). The limiting ring (18) is located above the threaded sleeve (15).

7. A nut tightening device, characterized in that: The nut tightening mechanism includes any one of claims 1-6.

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