A loosening-preventing positioning and locking device for an electric screwdriver head

Abstract

The utility model provides a kind of electric screwdriver head anti-loosening positioning locking device, including electric screwdriver body, the output end of electric screwdriver body is fixedly connected with connecting boss, the downside of connecting boss is equipped with installation groove, the inner wall of installation groove is slidably connected with electric screwdriver head, the upside of installation groove inner wall is fixedly connected with mounting post, the lower end of mounting post is equipped with hexagonal slot, the upper end of electric screwdriver head is fixedly connected with hexagonal connector, the upper end of mounting post is rotatably connected with outer tooth disc. By setting the positioning structure of hexagonal connector and hexagonal slot, the rigid locking structure of plugboard and slot, and the elastic locking structure of trapezoidal plugboard and trapezoidal ring groove, form double anti-loosening system, effectively improve the core problem that traditional spring collet type connection is easy to loosen under high-speed rotation and axial impact, simultaneously through the self-locking characteristics of worm gear, avoid locking failure caused by vibration, improve the stability and security of operation.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, specifically to an anti-loosening positioning and locking device for electric screwdriver bits. Background Technology

[0002] Electric screwdriver bits, as the core actuators of power tools, are widely used in industrial manufacturing, home appliance assembly, construction and other fields. The reliability of their connection with the electric screwdriver chuck directly affects work efficiency and assembly quality. The existing connection method between electric screwdriver bits and chucks is mainly spring-loaded, which fixes the bit through the radial elastic clamping force of the chuck. It has the advantages of simple structure and convenient assembly and disassembly, and is suitable for high-frequency bit changing operation scenarios.

[0003] However, under complex working conditions such as high-speed rotation and axial impact, traditional connection methods have shortcomings: the radial clamping force of the spring collet is easily offset by the impact load, causing the bit and the inner wall of the collet to slide relative to each other, which in turn leads to loosening. At the same time, the wear of components caused by long-term friction will further reduce the clamping force, increase the risk of loosening, and affect production efficiency and product quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an anti-loosening positioning and locking device for electric screwdriver bits to solve the problems mentioned in the background section. This invention features a novel structure, employing a hexagonal connector and hexagonal groove positioning structure, a rigid locking structure of the insert plate and slot, and an elastic locking structure of the trapezoidal insert plate and trapezoidal annular groove to form a dual anti-loosening system. This effectively improves the core problem of traditional spring-jacketed connections being prone to loosening under high-speed rotation and axial impact. Simultaneously, the self-locking characteristics of the worm gear prevent locking failure caused by vibration, thus improving operational stability and safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electric screwdriver bit anti-loosening positioning and locking device, comprising an electric screwdriver body, a connecting boss fixedly connected to the output end of the electric screwdriver body, a mounting groove formed on the lower side of the connecting boss, an electric screwdriver bit slidably fitted on the inner wall of the mounting groove, a mounting post fixedly connected to the upper side of the inner wall of the mounting groove, a hexagonal groove formed at the lower end of the mounting post, a hexagonal connector fixedly connected to the upper end of the electric screwdriver bit, an external gear plate rotatably fitted to the upper end of the mounting post, a hexagonal frame fixedly connected to the inner wall of the mounting groove, multiple guide rails evenly mounted on the upper circumference of the hexagonal frame, slide blocks slidably fitted on each of the multiple guide rails, guide rods fixedly connected to the upper sides of each of the multiple slide blocks, insert plates fixedly connected to opposite ends of each of the multiple slide blocks, multiple slots evenly formed on the outer circumference of the hexagonal connector, multiple arc-shaped extrusion grooves evenly formed on the upper side of the external gear plate that cooperate with the guide rods, and a driving mechanism provided on the inner wall of the mounting groove.

[0006] Furthermore, one end of each of the plurality of insert plates is slidably fitted onto the inner wall of the mounting post, and one end of each of the plurality of insert plates is respectively inserted into a corresponding slot.

[0007] Furthermore, the hexagonal connector is inserted into the hexagonal slot.

[0008] Furthermore, the drive mechanism includes a rotating shaft that is rotatably fitted on the inner wall of the mounting groove, a worm gear fixedly connected to the rotating shaft, a worm rotatably fitted on the outer side of the connecting boss, a gear mounted on the upper end of the rotating shaft, and a knob fixedly connected to the outer side of the worm extending to the connecting boss.

[0009] Furthermore, the gear meshes with the outer side of the external gear disk, and the worm meshes with the worm wheel.

[0010] Furthermore, the inner wall of the mounting groove is evenly provided with multiple storage slots, and the inner wall of each of the multiple storage slots is slidably fitted with a trapezoidal insert plate. A spring is fixedly connected to one side of the inner wall of each of the multiple storage slots, and one end of the spring is fixedly connected to one side of the trapezoidal insert plate.

[0011] Furthermore, a trapezoidal annular groove is provided on the outer side of the electric screwdriver bit, and multiple trapezoidal inserts are interference-fitted with the inner wall of the trapezoidal annular groove.

[0012] Furthermore, the outer side of the electric screwdriver body is fitted with an anti-slip rubber pad.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model forms a dual anti-loosening system by setting a positioning structure of hexagonal connector and hexagonal groove, a rigid locking structure of insert plate and slot, and an elastic locking structure of trapezoidal insert plate and trapezoidal ring groove. This effectively improves the core problem of easy loosening of traditional spring clip type connection under high speed rotation and axial impact. At the same time, the self-locking characteristics of worm gear and worm prevent locking failure caused by vibration, thus improving the stability and safety of operation.

[0015] 2. This utility model uses a knob-driven worm gear transmission structure, which is simple to operate and has controllable locking force. It can complete the installation and removal of electric screwdriver bits without additional tools, and is also suitable for high-frequency bit replacement operations, thereby improving overall production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an electric screwdriver bit anti-loosening positioning and locking device according to the present invention;

[0017] Figure 2 This is a schematic diagram of the electric screwdriver bit structure of the electric screwdriver bit anti-loosening positioning and locking device of this utility model;

[0018] Figure 3 This is a schematic diagram of the transverse cross-sectional structure of the connecting boss of the electric screwdriver bit anti-loosening positioning and locking device of this utility model;

[0019] Figure 4 This is a schematic diagram of the longitudinal section of the connecting boss of the electric screwdriver bit anti-loosening positioning and locking device of this utility model;

[0020] Figure 5 This is a schematic diagram of the drive mechanism of an anti-loosening positioning and locking device for electric screwdriver bits according to the present invention.

[0021] In the diagram: 1. Electric screwdriver body; 2. Connecting boss; 3. Mounting slot; 4. Electric screwdriver bit; 5. Mounting post; 6. Hexagonal slot; 7. Hexagonal connector; 8. External gear plate; 9. Hexagonal frame; 10. Guide rail; 11. Slide; 12. Guide rod; 13. Insert plate; 14. Slot; 15. Arc-shaped extrusion groove; 16. Drive mechanism; 161. Shaft; 162. Worm gear; 163. Worm; 164. Gear; 165. Knob; 17. Storage slot; 18. Trapezoidal insert plate; 19. Spring; 20. Trapezoidal ring groove; 21. Anti-slip pad. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please refer to Figures 1 to 5This utility model provides a technical solution: an electric screwdriver bit anti-loosening positioning and locking device, including an electric screwdriver body 1, a connecting boss 2 fixedly connected to the output end of the electric screwdriver body 1, a mounting groove 3 opened on the lower side of the connecting boss 2, an electric screwdriver bit 4 slidably fitted on the inner wall of the mounting groove 3, a mounting post 5 fixedly connected to the upper side of the inner wall of the mounting groove 3, a hexagonal groove 6 opened at the lower end of the mounting post 5, a hexagonal connector 7 fixedly connected to the upper end of the electric screwdriver bit 4, and an external gear plate 8 rotatably fitted on the upper end of the mounting post 5. A hexagonal frame 9 is fixedly connected to the inner wall of the screwdriver body 1. Multiple guide rails 10 are evenly installed on the upper circumference of the hexagonal frame 9. Each guide rail 10 has a sliding mount 11, and each sliding mount 11 has a guide rod 12 fixedly connected to its upper side. Each opposite end of each sliding mount 11 has a plate 13 fixedly connected to it. Multiple slots 14 are evenly formed on the outer circumference of the hexagonal connector 7. Multiple arc-shaped extrusion grooves 15 that mate with the guide rods 12 are evenly formed on the upper side of the outer gear plate 8. A drive mechanism 16 is provided on the inner wall of the mounting groove 3. The adjacent ends of the multiple plates 13 are slidably fitted onto the inner wall of the mounting post 5, and one end of each plate 13 is inserted into a corresponding slot 14. The hexagonal connector 7 is inserted into the hexagonal groove 6. An anti-slip pad 21 is fitted on the outer side of the screwdriver body 1. When the electric screwdriver bit 4 is inserted into the mounting slot 3 of the connecting boss 2, the hexagonal connector 7 at its upper end is inserted into the hexagonal slot 6 of the mounting post 5 to achieve initial positioning; the guide rail 10 on the hexagonal frame 9 supports the slide 11, and the slide 11 drives the insert plate 13 to slide along the guide rail 10. This structure restricts the circumferential rotation of the electric screwdriver bit 4 through hexagonal cooperation. The slide 11 and the insert plate 13 are set to prepare for subsequent locking. The anti-slip rubber pad 21 enhances the grip stability, and the whole structure forms an anti-loosening basic frame.

[0024] In this embodiment, the drive mechanism 16 includes a rotating shaft 161 rotatably fitted on the inner wall of the mounting groove 3. A worm gear 162 is fixedly connected to the rotating shaft 161. A worm 163 is rotatably fitted to the outer side of the connecting boss 2. A gear 164 is mounted on the upper end of the rotating shaft 161. A knob 165 is fixedly connected to the outer side of the connecting boss 2 at the outer end of the worm 163. The gear 164 meshes with the outer side of the external gear disk 8, and the worm 163 meshes with the worm gear 162. Rotating knob 165 drives worm gear 163 to rotate, which in turn drives worm wheel 162 and shaft 161 to rotate, causing gear 164 to mesh with external gear disc 8 and drive it to rotate. The arc-shaped extrusion groove 15 of external gear disc 8 extrudes guide rod 12, pushing slide 11 to move along guide rail 10 towards the center. Insert plate 13 is then inserted into slot 14 of hexagonal connector 7. Through the self-locking characteristics of worm wheel 162 and worm gear 163 and the transmission of gear 164, the insert plate 13 is rigidly locked to the electric screwdriver bit 4, preventing circumferential loosening during high-speed rotation and improving torque transmission stability.

[0025] In this embodiment, the inner wall of the mounting groove 3 is uniformly provided with multiple storage grooves 17. Trapezoidal insert plates 18 are slidably fitted onto the inner walls of each storage groove 17. A spring 19 is fixedly connected to one side of each inner wall of the storage groove 17, with one end of the spring 19 fixedly connected to one side of the trapezoidal insert plate 18. A trapezoidal annular groove 20 is provided on the outer side of the electric screwdriver bit 4, and the trapezoidal insert plates 18 are interference-fitted with the inner wall of the trapezoidal annular groove 20. During the insertion of the electric screwdriver bit 4 into the mounting groove 3, its outer side presses against the trapezoidal insert plates 18, retracting them into the storage grooves 17, and the spring 19 is compressed. When the electric screwdriver bit 4 is in place, the trapezoidal insert plates 18 are reset under the elastic force of the spring 19, interfering with the trapezoidal annular groove 20 of the electric screwdriver bit 4. This structure utilizes the continuous preload of the spring 19 and the wedge effect of the trapezoidal surface to limit the axial displacement of the electric screwdriver bit 4, counteract the axial impact force during operation, and form a double anti-loosening mechanism with the insert plate 13, preventing loosening caused by high-frequency vibration.

[0026] When using the device, it is first initially positioned by the hexagonal connector 7 and the hexagonal groove 6; turning the knob 165 causes the outer gear plate 8 to rotate via the worm gear 163, worm wheel 162, and gear 164, and the arc-shaped extrusion groove 15 pushes the guide rod 12 to drive the insert plate 13 into the slot 14, achieving circumferential rigid locking; at the same time, the trapezoidal insert plate 18 is engaged in the trapezoidal ring groove 20 under the action of the spring 19, completing axial elastic locking. The double locking structure works together to resist circumferential rotational force and axial impact force respectively. Combined with the grip stability of the anti-slip rubber pad 21, it effectively prevents the electric screwdriver bit 4 from loosening, ensuring the accuracy and safety of operation.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A locking and positioning device for preventing loosening of an electric screwdriver bit, comprising an electric screwdriver body (1), characterized in that: The output end of the electric screwdriver body (1) is fixedly connected to a connecting boss (2). A mounting groove (3) is provided on the lower side of the connecting boss (2). An electric screwdriver bit (4) is slidably fitted onto the inner wall of the mounting groove (3). A mounting post (5) is fixedly connected to the upper side of the inner wall of the mounting groove (3). A hexagonal groove (6) is provided at the lower end of the mounting post (5). A hexagonal connector (7) is fixedly connected to the upper end of the electric screwdriver bit (4). An external gear plate (8) is rotatably fitted to the upper end of the mounting post (5). A hexagonal frame (9) is fixedly connected to the inner wall of the mounting groove (3). Multiple guide rails (10) are evenly installed on the upper circumference of the lateral frame (9). Each of the multiple guide rails (10) is slidably fitted with a slide block (11). Each of the multiple slide blocks (11) is fixedly connected to a guide rod (12) on its upper side. Each of the multiple slide blocks (11) is fixedly connected to an insert plate (13) at one end of its opposite side. Multiple slots (14) are evenly opened on the outer circumference of the hexagonal connector (7). Multiple arc-shaped extrusion grooves (15) that cooperate with the guide rods (12) are evenly opened on the upper side of the external gear plate (8). A drive mechanism (16) is provided on the inner wall of the mounting groove (3).

2. The electric screwdriver bit anti-loosening positioning and locking device according to claim 1, characterized in that: One end of each of the plurality of insert plates (13) is slidably fitted on the inner wall of the mounting post (5), and one end of each of the plurality of insert plates (13) is respectively inserted into the corresponding slot (14).

3. The electric screwdriver bit anti-loosening positioning and locking device according to claim 1, characterized in that: The hexagonal connector (7) is inserted into the hexagonal groove (6).

4. The electric screwdriver bit anti-loosening positioning and locking device according to claim 1, characterized in that: The drive mechanism (16) includes a rotating shaft (161) rotatably fitted on the inner wall of the mounting groove (3), a worm gear (162) fixedly connected to the rotating shaft (161), a worm (163) rotatably fitted to the outer side of the connecting boss (2), a gear (164) installed at the upper end of the rotating shaft (161), and a knob (165) fixedly connected to the outer side of the worm (163) extending to the outer side of the connecting boss (2).

5. The electric screwdriver bit anti-loosening positioning and locking device according to claim 4, characterized in that: The gear (164) meshes with the outer side of the external gear disk (8), and the worm (163) meshes with the worm wheel (162).

6. The electric screwdriver bit anti-loosening positioning and locking device according to claim 1, characterized in that: The inner wall of the mounting groove (3) is evenly provided with multiple storage grooves (17), and the inner wall of each of the multiple storage grooves (17) is slidably fitted with a trapezoidal insert plate (18). A spring (19) is fixedly connected to one side of the inner wall of each of the multiple storage grooves (17), and one end of the spring (19) is fixedly connected to one side of the trapezoidal insert plate (18).

7. The electric screwdriver bit anti-loosening positioning and locking device according to claim 6, characterized in that: The electric screwdriver bit (4) has a trapezoidal annular groove (20) on its outer side, and the multiple trapezoidal inserts (18) are interference-fitted with the inner wall of the trapezoidal annular groove (20).

8. The electric screwdriver bit anti-loosening positioning and locking device according to claim 1, characterized in that: The outer side of the electric screwdriver body (1) is fitted with an anti-slip rubber pad (21).

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