A bushing looseness inspection tool

Abstract

The present invention relates to a tool for checking whether a tight-fitting bushing is loose after installation, and belongs to the field of mechanical design. A bushing looseness inspection tool comprises a sleeve, a shaft, a spring and a set screw; a stepped hole for inserting the shaft is provided in the sleeve; the shaft is inserted from the rear end of the sleeve, and its insertion end passes through the front end of the sleeve, and the other end is located in the sleeve; the spring is provided in the sleeve, and is limited between the end of the shaft and the set screw; the set screw is threadedly connected to the rear end of the sleeve. The present invention has the following advantages: 1. This bushing looseness inspection tool uses a compression deformation force mode with the help of a spring and thread adjustment to achieve a low-intensity, high-efficiency, standardized bushing looseness inspection effect; 2. It has strong expansibility, high movement stability and simple operation during the bushing inspection process; it can be replaced and adjusted in combination with the product appearance structure, and is suitable for the installation effect inspection of bushings of different models, and can meet the use requirements of multiple types of products.

Description

Technical Field

[0001] The invention relates to a tool for checking whether a tight-fitting bushing is loose after installation, and belongs to the field of mechanical design. Background Art

[0002] Bushings are a type of component that protects the mechanical connection parts of equipment or related heavy parts. The use of bushings can reduce wear between parts and avoid the increase of clearance between shafts and holes.

[0003] With the continuous expansion of the demand for existing mechanical systems, the requirements for the position accuracy control of moving parts are constantly increasing, and the application of bushings is becoming more and more extensive. The locking mechanism of the locking pin type structure is used in various folding mechanism systems to improve the stability of the folding mechanism system during the working stage. The key to its stability lies in the small clearance fit between the shaft and the hole. Only when the bushing is installed in the hole of the part with an interference fit and is firmly fixed without movement or loosening, can the stability of the locking mechanism shaft and hole be ensured. However, the bushing of a certain type of locking pin has been loosened many times during installation, and it is imperative to study and apply the loosening inspection technology of the bushing. Summary of the invention

[0004] The purpose of the present invention is to provide a bushing looseness inspection tool, which can ensure safe production and improve the one-time qualified rate of bushing installation at key parts of products according to actual production needs.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a bushing looseness inspection tool, which includes a sleeve, a shaft, a spring and a locking screw; a stepped hole for inserting the shaft is provided in the sleeve; the shaft is inserted from the rear end of the sleeve, and its insertion end passes through the front end of the sleeve, and the other end is located in the sleeve; the spring is arranged in the sleeve and is confined between the end of the shaft and the locking screw; the locking screw is threadedly connected to the rear end of the sleeve.

[0006] Preferably, a boss is provided along the outer circumference of the sleeve, the boss is close to the front end of the sleeve, and is on the same horizontal plane as the boss of the stepped hole in the sleeve.

[0007] Preferably, both ends of the shaft are boss structures, the lower end boss abuts against the stepped hole boss in the sleeve, and one end of the spring is sleeved on the upper end boss.

[0008] Preferably, after the set screw and the shaft sleeve are threaded together, a rubber pad is pasted on the top of the two for buffering and shock absorption.

[0009] Preferably, a nylon washer is inserted into the front end of the shaft sleeve.

[0010] Preferably, the length of the internal thread section of the sleeve is greater than the length of the external thread section of the set screw.

[0011] Preferably, waist-shaped slots are provided along the length direction of the sleeve, and there are two waist-shaped slots, which are arranged opposite to the mounting ends of the spring and the shaft, and the length direction of the waist-shaped slots is consistent with the length direction of the sleeve.

[0012] The bushing looseness inspection tool is an inspection tool designed for tightening bushings of certain types of products. It is a conversion method used to check the bushing interference effect after the bushing is installed. By replacing springs of different strengths for fixed force setting, it aims to reduce labor intensity, improve the bushing installation qualification rate, and ensure product quality.

[0013] Compared with the prior art, the present invention has the following advantages: 1. This bushing looseness inspection tool uses spring and thread adjustment and adopts compression deformation force to achieve low-intensity, high-efficiency and standardized bushing looseness inspection effect; 2. It has strong expansibility, high movement stability and easy operation during bushing inspection. It can be replaced and adjusted according to the product appearance and structure, suitable for installation effect inspection of bushings of different models, and can meet the use requirements of various products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 is a cross-sectional view of an embodiment of the present invention; Figure 1-2 In the figure, 1-rubber pad; 2-set screw; 3-spring; 4-sleeve; 5-shaft; 6-nylon washer. DETAILED DESCRIPTION

[0015] It should be noted that, in this embodiment, the terms "upper" and "lower" are described as shown in the accompanying drawings, and "front" and "back" correspond one-to-one with the "lower" and "upper" shown in the accompanying drawings, and do not constitute a limitation of the present invention. Ordinary technicians in this field should understand it in accordance with the technical solution of the present invention.

[0016] The following is combined with Figure 1-2 The present invention is further described in detail: a bushing looseness inspection tool includes a sleeve 4, a shaft 5, a spring 3 and a set screw 2; a stepped hole for inserting the shaft 5 is provided in the sleeve 4; the shaft 5 is inserted from the rear end of the sleeve 4, and its insertion end passes through the front end of the sleeve 4, and the other end is located in the sleeve 4; the spring 3 is arranged in the sleeve 4, and is confined between the end of the shaft and the set screw 2; the set screw 2 is threadedly connected to the rear end of the sleeve 4.

[0017] As a preferred implementation of this embodiment, a boss is provided along the outer circumference of the sleeve 4 , the boss is close to the front end of the sleeve 4 , and is on the same horizontal plane as the boss of the stepped hole in the sleeve 4 .

[0018] As a preferred implementation of this embodiment, both ends of the shaft 5 are boss structures, the lower end boss abuts against the stepped hole boss in the sleeve 4, and one end of the spring 3 is sleeved on the upper end boss.

[0019] As a preferred implementation of this embodiment, after the set screw 2 and the shaft sleeve 4 are threaded together, a rubber pad 1 is pasted on the top of the two for buffering and shock absorption.

[0020] As a preferred implementation of this embodiment, a nylon washer 6 is inserted into the front end of the sleeve 4 to protect the sleeve.

[0021] As a preferred implementation of this embodiment, the length of the internal thread section of the sleeve 4 is greater than the length of the external thread section of the set screw 2 .

[0022] As a preferred implementation of this embodiment, waist-shaped slots are provided along the length direction of the sleeve 4. There are two waist-shaped slots, which are arranged opposite to the mounting ends of the spring 3 and the shaft 5, and their length direction is consistent with the length direction of the sleeve.

[0023] The installation process of the bushing looseness inspection tool is as follows: after the shaft 5 is inserted into the sleeve 4 from the rear to be positioned, the spring 3 is installed, and the set screw 2 is used to compress the spring 3 by utilizing its threaded structure with the sleeve 4. The corresponding output force can be set by adjusting the set screw 2. After the assembly is completed, a layer of rubber pad 1 is pasted on the outer surface of the set screw 2 and the sleeve 4 for buffering and shock absorption; finally, a nylon washer 6 is inserted into the front end boss of the sleeve 4 to protect the sleeve and prevent damage to the sleeve or other components during the inspection process.

[0024] The operation process of the bushing looseness inspection tool is as follows: the operator holds the sleeve 4, aligns the shaft 5 with the bushing surface to be inspected, and uses the compression force of the spring 3 to apply force to the inspection bushing until the nylon washer 6 contacts the bushing surface. If the bushing is not loose or shaking at this time, it can be determined that the bushing has been installed properly.

[0025] The present invention has strong expansibility, high movement stability and simple operation during the bushing inspection process; it can be replaced and adjusted in combination with the product appearance structure, is suitable for installation effect inspection of bushings of different models, and can meet the use requirements of various types of products.

Claims

1. A bushing looseness inspection tool, characterized in that: It includes a sleeve, a shaft, a spring and a set screw; a stepped hole for inserting the shaft is arranged in the sleeve; the shaft is inserted from the rear end of the sleeve, and its insertion end passes through the front end of the sleeve, and the other end is located in the sleeve; the spring is arranged in the sleeve and is confined between the end of the shaft and the set screw; the set screw is threadedly connected to the rear end of the sleeve.

2. The bushing looseness inspection tool according to claim 1, characterized in that: A boss is arranged along the outer circumference of the shaft sleeve, and the boss is close to the front end of the shaft sleeve.

3. The bushing looseness inspection tool according to claim 1 or 2, characterized in that: Both ends of the shaft are boss structures, the lower end boss abuts against the stepped hole boss in the shaft sleeve, and one end of the spring is sleeved on the upper end boss.

4. The bushing looseness inspection tool according to claim 2, characterized in that: The boss and the boss of the stepped hole in the sleeve are on the same horizontal plane.

5. The bushing looseness inspection tool according to claim 1, characterized in that: After the set screw and the sleeve are threaded together, a rubber pad is pasted on the top of the two for cushioning and shock absorption.

6. The bushing looseness inspection tool according to claim 1, characterized in that: Insert the nylon washer into the front end of the sleeve.

7. The bushing looseness inspection tool according to claim 1, characterized in that: The length of the internal thread section of the sleeve is greater than the length of the external thread section of the set screw.

8. The bushing looseness inspection tool according to claim 1, characterized in that: A waist-shaped slot hole is opened along the length direction of the shaft sleeve. There are two waist-shaped slot holes, which are arranged at the installation ends of the spring and the shaft relatively, and the length direction of the waist-shaped slot holes is consistent with the length direction of the shaft sleeve.

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