Screw tightening assembly and tightening machine

Abstract

The utility model discloses a screw tightening assembly and a tightening machine. The screw tightening assembly comprises a sleeve body and a wrench. The sleeve body extends downwards, a mounting hole is formed in the top face of the sleeve body downwards, the bottom face of the sleeve body is concavely arranged upwards corresponding to the mounting hole to form a guide groove, the guide groove is used for being matched with the head of a screw and communicated with the mounting hole, a guide hole is formed in the bottom end of the guide groove, and the guide hole extends outwards and downwards to the bottom face of the sleeve body. The diameter of the guide hole is gradually increased from top to bottom; the upper end of the wrench is arranged in the mounting hole in a matched mode, and the lower end of the wrench extends downwards into the guide groove to be matched with the operation groove in the head of the screw. When the screw is tightened, the screw is firstly inserted into the guide groove through the guide hole, and then the screw is accurately aligned with the wrench under the guide of the guide groove, so that the positioning precision is improved, the wrench can be accurately inserted into the operation groove in the head of the screw, and the screw is quickly tightened.

Description

Technical Field

[0001] The utility model relates to the technical field of tightening devices, in particular to a screw tightening assembly and a tightening machine. Background Art

[0002] In the disc brake wheel end of a trailer axle, multiple hexagon socket head cap screws evenly distributed in a circle are commonly used to connect the brake disc and the wheel hub. When mass-producing, if the screws are tightened one by one, it takes a long time and will slow down the production rhythm of the assembly line. To solve the problem of low production efficiency, a multi-axis tightening machine is generally used to tighten the screws. A tightening head for tightening the screws is installed on the output shaft of the tightening machine. A convex part protrudes from the end face of the end of the tightening head far from the output shaft. The convex part is used to cooperate with the hexagon socket in the screw head. When the tightening machine tightens the screw, the convex part first inserts into the hexagon socket, and then the output shaft drives the tightening head to move to tighten the screw. However, when the above tightening machine tightens the screw, the convex part is not easy to align with the hexagon socket, resulting in the tightening head being prone to slipping during the process of tightening the screw, causing the screw not to be tightened in place, that is, the tightening process fails, affecting the product quality. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a screw tightening assembly and a tightening machine that improve the positioning accuracy by setting a guiding hole at the bottom of the sleeve body.

[0004] To achieve the above purpose, the embodiments of the utility model adopt the following technical solutions:

[0005] A screw tightening assembly, including a sleeve body and a wrench;

[0006] The sleeve body extends downward, and an installation hole is opened downward on its top surface. A guiding groove is concavely formed upward on the bottom surface of the sleeve body corresponding to the installation hole. The guiding groove is used to cooperate with the head of the screw and communicate with the installation hole. The bottom end of the guiding groove forms a guiding hole. The guiding hole extends outward and downward to the bottom surface of the sleeve body, and the diameter of the guiding hole gradually increases from top to bottom;

[0007] The upper end of the wrench is fitted in the installation hole, and the lower end of the wrench extends downward into the guiding groove to cooperate with the operation groove of the screw head.

[0008] Further, the lower end of the wrench is higher than the guiding hole.

[0009] Further, the side of the longitudinal section of the guiding hole is an inclined straight line or an arc.

[0010] Further, a guiding part is formed at the lower end of the wrench. The guiding part extends to the end face of the lower end of the wrench and its diameter gradually decreases from top to bottom.

[0011] Further, there is a spacing between the top surface of the wrench and the top surface of the sleeve body, such that an upper end of the mounting hole forms a shaft hole located above the wrench, and the shaft hole is used for mating with an output shaft of a tightening machine.

[0012] Further, an outer peripheral wall of the sleeve body is concavely formed with an annular channel corresponding to the shaft hole, and a through hole is formed on one side of an inner side wall of the channel along a radial direction of the sleeve body and inwardly, and the through hole passes through the shaft hole and extends to the other side outside the inner side wall of the channel.

[0013] Further, a pressing block is fitted in the mounting hole, and the pressing block is located above the wrench and abuts against the top surface of the wrench.

[0014] Further, a plug is also threadedly connected in the mounting hole, and the plug abuts against the top surface of the pressing block and there is a spacing between the plug and the top surface of the sleeve body, such that an upper end of the mounting hole forms a shaft hole located above the plug, and the shaft hole is used for mating with an output shaft of a tightening machine.

[0015] Further, the guiding hole is conical.

[0016] In the screw tightening assembly of the present utility model, a guiding groove is concavely formed on a bottom surface of the sleeve body. The guiding groove is used for mating with a head of a screw and communicating with the mounting hole. A guiding hole is formed at a bottom end of the guiding groove, and a diameter of the guiding hole gradually increases from top to bottom. An upper end of the wrench is fitted in the mounting hole, and a lower end of the wrench extends downward into the guiding groove to mate with an operation groove of the screw head. When tightening the screw, the screw first inserts into the guiding groove through the guiding hole, and then the screw is accurately aligned with the wrench under the guidance of the guiding groove, thereby improving the positioning accuracy, enabling the wrench to accurately insert into the operation groove, realizing rapid tightening of the screw, and further improving the working efficiency. The screw tightening assembly of the present utility model has the characteristics of simple structure and convenient installation.

[0017] An embodiment of the present utility model further provides a tightening machine, including an output shaft and the screw tightening assembly according to any one of the above embodiments, and the screw tightening assembly is connected to the output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional exploded view of the screw tightening assembly according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 a cross-sectional view of;

[0020] Figure 3 is Figure 2 a usage state diagram of;

[0021] Figure 4 isFigure 2 Schematic diagram of another embodiment. Specific implementation manners

[0022] Next, in combination with the accompanying drawings and specific implementation manners, the present utility model will be further described:

[0023] As Figures 1 to 4 shown, an embodiment of the present utility model provides a screw tightening assembly, which is installed on a tightening machine (not shown) and is used to tighten the screw 100 at the wheel end of a trailer axle disc brake. The screw 100 is used to connect the brake disc and the wheel hub. The screw tightening assembly includes a sleeve body 1 and a wrench 2, and the wrench 2 is installed on the sleeve body 1.

[0024] As Figure 1 , Figure 2 shown, the sleeve body 1 extends downward, and a mounting hole 11 is opened downward in the middle of its top surface. A guiding groove 12 is concavely formed upward on the bottom surface of the sleeve body 1 corresponding to the mounting hole 11. The guiding groove 12 is used to cooperate with the head 101 of the screw 100 and communicate with the mounting hole 11, and the guiding groove 12 and the mounting hole 11 are coaxial. A guiding hole 121 is formed at the bottom end of the guiding groove 12. The guiding hole 121 extends outward and downward to the bottom surface of the sleeve body 1, and the diameter of the guiding hole 121 gradually increases from top to bottom. Specifically, the side 1211 of the longitudinal section of the guiding hole 121 is an inclined straight line or an arc (as Figure 2 , Figure 4 shown). In this embodiment, the guiding hole 121 is conical.

[0025] As Figure 2 , Figure 3 shown, the upper end of the wrench 2 is fitted into the mounting hole 11, and the lower end of the wrench 2 extends downward into the guiding groove 12 to cooperate with the operation groove 102 of the screw head 101. The operation groove 102 is an internal hexagonal groove. When tightening the screw 100, the screw 100 first inserts into the guiding groove 12 through the guiding hole 121, and then the screw 100 is accurately aligned with the wrench 2 under the guidance of the guiding groove 12, thereby improving the positioning accuracy, enabling the wrench 2 to accurately insert into the operation groove 102, realizing rapid tightening of the screw 100, further improving the working efficiency, and the screw tightening assembly has a simple structure and is convenient to install.

[0026] Specifically, as Figure 2 , Figure 3As shown, the lower end of the wrench 2 is higher than the guiding hole 121, which can ensure that the screw 100 is correctly positioned first, and then the wrench 2 is inserted into the operation groove 102, further improving the positioning accuracy. A guiding portion 21 is formed at the lower end of the wrench 2. The guiding portion 21 extends to the end face of the lower end of the wrench 2 and its diameter gradually decreases from top to bottom. In this embodiment, the guiding portion 21 is a main conical shape. By providing the guiding portion 21, when the screw 100 is tightened, the wrench 2 is accurately aligned with the operation groove 102 under the guidance of the guiding portion 21, thereby further improving the positioning accuracy.

[0027] As Figure 2 , Figure 3 shown, in order to simplify the structure and processing technology, specifically, there is a spacing between the top surface of the wrench 2 and the top surface of the sleeve body 1, so that an axial hole 111 located above the wrench 2 is formed at the upper end of the mounting hole 11. The axial hole 111 is used to cooperate with the output shaft (not shown) of the tightening machine and it is square. In order to further improve the positioning stability and accuracy, in this embodiment, a pressing block 3 is fitted in the mounting hole 11. The pressing block 3 is located above the wrench 2 and abuts against the top surface of the wrench 2 to limit the upward movement of the wrench 2. Specifically, a plug 4 is also threadedly connected in the mounting hole 11. The plug 4 abuts against the top surface of the pressing block 3 to limit the upward movement of the pressing block 3 and there is a spacing between the plug 4 and the top surface of the sleeve body 1, so that the axial hole 111 located above the plug 4 is formed at the upper end of the mounting hole 11. The axial hole 111 is used to cooperate with the output shaft of the tightening machine.

[0028] As Figure 2 , Figure 3 shown, a ring-shaped groove 13 is concavely formed on the outer peripheral wall of the sleeve body 1 corresponding to the axial hole 111. The cross-section of the groove 13 is arc-shaped. A through hole 14 is opened inward along the radial direction of the sleeve body 1 on one side of the inner side wall of the groove 13. The through hole 14 passes through the axial hole 111 and extends to the other side outside the inner side wall of the groove 13. The through hole 14 is used for installing a pin. When the axial hole 111 of the sleeve body 1 cooperates with the output shaft, a pin for connecting the sleeve body 1 and the output shaft is inserted into the through hole 14, so that the sleeve body 1 can be stably installed on the output shaft.

[0029] In the screw tightening assembly of the present utility model, a guiding groove is concavely formed on the bottom surface of the sleeve body. The guiding groove is used to cooperate with the head of the screw and communicate with the mounting hole. The bottom end of the guiding groove forms a guiding hole. The diameter of the guiding hole gradually increases from top to bottom. And the upper end of the wrench is fitted in the mounting hole. The lower end of the wrench extends downward into the guiding groove to cooperate with the operation groove of the screw head. When tightening the screw, the screw first passes through the guiding hole and is inserted into the guiding groove, and then the screw is accurately aligned with the wrench under the guidance of the guiding groove, thereby improving the positioning accuracy, enabling the wrench to accurately insert into the operation groove, realizing rapid tightening of the screw, and further improving the working efficiency. The screw tightening assembly of the present utility model has the characteristics of simple structure and convenient installation.

[0030] An embodiment of the present utility model further provides a tightening machine (not shown), which includes an output shaft and the screw tightening assembly described in any of the above embodiments, and the screw tightening assembly is connected to the output shaft.

[0031] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A screw tightening assembly, characterized in that: Includes a socket body and a wrench; The sleeve body extends downward and has a mounting hole formed downward on its top surface. The bottom surface of the sleeve body is recessed upward corresponding to the mounting hole to form a guide groove. The guide groove is used to cooperate with the head of the screw and communicate with the mounting hole. A guide hole is formed at the bottom end of the guide groove. The guide hole extends outward and downward to the bottom surface of the sleeve body, and the diameter of the guide hole gradually increases from top to bottom. The upper end of the wrench is matched in the mounting hole, and the lower end of the wrench extends downward into the guide groove to match with the operating groove of the screw head.

2. The screw tightening assembly according to claim 1, characterized in that: The lower end of the wrench is higher than the guide hole.

3. The screw tightening assembly according to claim 1, characterized in that: The side edge of the longitudinal section of the guide hole is an inclined straight line or an arc.

4. The screw tightening assembly according to claim 1, characterized in that: A guide portion is formed at the lower end of the wrench. The guide portion extends to the end surface of the lower end of the wrench and its diameter gradually decreases from top to bottom.

5. The screw tightening assembly according to claim 1, characterized in that: There is a distance between the top surface of the wrench and the top surface of the sleeve body, so that the upper end of the mounting hole forms an axial hole located above the wrench, and the axial hole is used to cooperate with the output shaft of the tightening machine.

6. The screw tightening assembly according to claim 5, characterized in that: The outer wall of the sleeve body is recessed inwardly corresponding to the axial hole to form an annular groove, and a through hole is opened inwardly along the radial direction of the sleeve body on one side of the inner wall of the groove. The through hole passes through the axial hole and extends to the outside of the other side of the inner wall of the groove.

7. The screw tightening assembly according to claim 1, characterized in that: A pressing block is fitted in the mounting hole, and the pressing block is located above the wrench and abuts against the top surface of the wrench.

8. The screw tightening assembly according to claim 7, characterized in that: A screw plug is also threadedly connected in the mounting hole, and the screw plug is abutted against the top surface of the pressure block and has a distance from the top surface of the sleeve body, so that an axial hole located above the screw plug is formed at the upper end of the mounting hole, and the axial hole is used to cooperate with the output shaft of the tightening machine.

9. The screw tightening assembly according to claim 1, characterized in that: The guide hole is tapered.

10. A tightening machine, characterized in that: It comprises an output shaft and a screw tightening assembly as claimed in any one of claims 1 to 9, wherein the screw tightening assembly is connected to the output shaft.

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