Safety pin shearing force testing device

Abstract

The utility model discloses a safety pin shearing force testing device which comprises a mechanical testing machine main machine, a tray is installed on the lower portion of the mechanical testing machine main machine, a testing pressure telescopic column is installed on the upper portion of the mechanical testing machine main machine, and a safety pin installation support is placed on the top face of the tray. Middle grooves extending downwards are formed in the middles of the top faces of a left side plate and a right side plate of the safety pin mounting support, the left end and the right end of each middle groove extend out of the left side wall and the right side wall of the corresponding side plate, and rotating shaft supporting parts of the left portion and the right portion of the safety pin are inserted into the corresponding middle grooves in a sleeved mode. The bottom surface of the rotating shaft supporting part is pressed against the bottom surface of the corresponding middle groove; the safety pin can be mounted and positioned, so that the safety pin can be tested through a conventional mechanical testing machine host, the structure is simple, the manufacturing is convenient, the test is accurate, and the high-precision production detection requirement of the safety pin is met.

Description

Technical Field:

[0001] The utility model relates to the technical field of safety pin detection equipment, and more specifically to a safety pin shearing force test device. Background Art:

[0002] Shearing force safety pins are widely used in dry goods sending devices (such as dry goods belt conveyors, etc.). When in use, the shearing force safety pins bear and transmit the tensile force in the system. When the tensile force exceeds the design allowable value, the safety pins are automatically sheared short by shear force. On the one hand, the shearing force safety pins bear the normal acting force of the system, and on the other hand, they play a protective role in the system, avoiding excessive force on the system and causing damage to other key components. The shearing force safety pin is equivalent to the fuse in the circuit system. The accuracy of the shearing resistance ability data of the safety pin is crucial for the safety of the system and is the last safety measure for protecting key components when the system is overloaded.

[0003] The existing shearing resistance data of safety pins can be determined by theoretical calculation, finite element simulation, and tests. Among them, the data deviation between theoretical calculation and finite element simulation is relatively large because there are certain deviations between the calculation input data and the actual situation in both theoretical calculation and finite element simulation, such as the mechanical properties and hardness indexes of materials.

[0004] In the production of shearing force safety pins with high precision requirements, it is often necessary to obtain the actual shearing resistance value of the safety pins, but there is no corresponding detection tooling at present. Content of the Utility Model:

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a safety pin shearing force test device, which can install and position the safety pin so as to be tested by a conventional mechanical testing machine mainframe. It has a simple structure, is easy to manufacture, has accurate testing, and meets the production and detection needs of high-precision safety pins.

[0006] The solution of the utility model to solve the above technical problems is:

[0007] A safety pin shearing force test device includes a mechanical testing machine mainframe. A tray is installed at the lower part of the mechanical testing machine mainframe, and a test pressure telescopic column is installed at the upper part of the mechanical testing machine mainframe. A safety pin installation support is placed on the top surface of the tray.

[0008] Middle grooves extending downward are formed in the middle parts of the top surfaces of the left and right side plates of the safety pin installation support. The left and right ends of the middle grooves extend out of the left and right side walls of the corresponding side plates. The left and right shaft support parts of the safety pin are inserted into the corresponding middle grooves, and the bottom surfaces of the shaft support parts are pressed against the bottom surfaces of the corresponding middle grooves.

[0009] Above the safety pin mounting support, there is a safety pin pressure plate. In the middle of the bottom surface of the safety pin pressure plate, there is a pressing and mounting block extending downward. In the middle of the bottom surface of the pressing and mounting block, there is a pressing groove penetrating from left to right. The central cylindrical part in the middle of the safety pin is inserted into the pressing groove, and the top surface of the central cylindrical part is closely attached to the top surface of the pressing groove. The bottom end of the test pressure telescopic column presses against the top surface of the safety pin pressure plate. Its pressing groove and middle groove can position and press the safety pin.

[0010] In the middle of the top surface of the safety pin pressure plate, there is a circular groove. The bottom end of the test pressure telescopic column is inserted into the circular groove. The outer side wall of the bottom end of the test pressure telescopic column is closely attached to the inner side wall of the circular groove, and the bottom surface of the test pressure telescopic column presses against the bottom surface of the circular groove. The circular groove positions and limits the bottom of the test pressure telescopic column, ensuring that the safety pin pressure plate does not turn over when pressing down.

[0011] Furthermore, the safety pin includes two rotating shaft support parts and a central cylindrical part. At both the left and right ends of the central cylindrical part, there are extending connection parts, and the outer ends of the two extending connection parts are formed on the inner end surfaces of the corresponding rotating shaft support parts;

[0012] The left and right end surfaces of the rotating shaft support part are in the same vertical plane as the left and right end surfaces of the corresponding middle groove. The bottom surface of the middle groove is an arc-shaped wall surface. The rotating shaft support part is a cylinder, and its bottom surface is matched and closely attached to the bottom surface of the middle groove.

[0013] On the top surfaces of the left and right side plates of the safety pin mounting support, upper cover plates are fixedly connected by bolts. The upper cover plates cover the top surface of the corresponding middle groove and press against the top surface of the rotating shaft support part. The upper cover plate can press and lock the rotating shaft support part of the safety pin.

[0014] The outstanding effect of the present utility model is:

[0015] Compared with the prior art, it can install and position the safety pin so that it can be tested by a conventional mechanical testing machine mainframe. Its structure is simple, manufacturing is convenient, the test is accurate, and it meets the production and detection needs of high-precision safety pins. Description of the drawings:

[0016] Figure 1 is a partial structural schematic diagram of the present utility model;

[0017] Figure 2 is a partial cross-sectional view of the safety pin mounting support and the safety pin;

[0018] Figure 3 is a partial cross-sectional view between the safety pin mounting support and the safety pin pressure plate. Specific implementation manners:

[0019] Example, seeFigures 1 to 3 As shown in Figures 1 to 3 , a safety pin shearing force test device includes a main body of a mechanical testing machine. A tray 10 is installed at the lower part of the main body of the mechanical testing machine, and a test pressure telescopic column 20 is installed at the upper part of the main body of the mechanical testing machine. The main body of the mechanical testing machine used in this embodiment is an existing conventional device and can be directly purchased on the market. Therefore, it will not be described in detail.

[0020] A safety pin mounting support 4 is placed on the top surface of the tray 10, and the bottom surface of the safety pin mounting support 4 is pressed against the top surface of the tray 10.

[0021] In the middle of the top surfaces of the left and right side plates of the safety pin mounting support 4, downwardly extending middle grooves 41 are formed. The left and right ends of the middle grooves 41 extend out of the left and right side walls of the corresponding side plates. The safety pin 3 includes two shaft support portions 31 and a central cylindrical portion 32. At both ends of the central cylindrical portion 32, extending connection portions 33 are formed, and the outer ends of the two extending connection portions 33 are formed on the inner end surfaces of the corresponding shaft support portions 31.

[0022] The shaft support portions 31 are inserted into the corresponding middle grooves 41. The left and right end surfaces of the shaft support portions 31 and the left and right end surfaces of the corresponding middle grooves 41 are in the same vertical plane. The bottom surface of the middle groove 41 is an arc-shaped wall surface, and the shaft support portion 31 is a cylinder, and its bottom surface is matched with and closely adheres to the bottom surface of the middle groove 41.

[0023] Above the safety pin mounting support 4, there is a safety pin pressing disc 1. In the middle of the bottom surface of the safety pin pressing disc 1, a downwardly extending pressing and mounting block 11 is formed. The pressing and mounting block 11 is located between the two side plates of the safety pin mounting support 4. In the middle of the bottom surface of the pressing and mounting block 11, a left-right penetrating pressing groove 12 is formed. The central cylindrical portion 32 in the middle of the safety pin 3 is inserted into the pressing groove 12, and the top surface of the central cylindrical portion 32 closely adheres to the top surface of the pressing groove 12. The bottom end of the test pressure telescopic column 20 is pressed against the top surface of the safety pin pressing disc 1.

[0024] Furthermore, in the middle of the top surface of the safety pin pressing disc 1, a circular groove 13 is formed. The bottom end of the test pressure telescopic column 20 is inserted into the circular groove 13. The outer side wall of the bottom end of the test pressure telescopic column 20 closely adheres to the inner side wall of the circular groove 13, and the bottom surface of the test pressure telescopic column 20 is pressed against the bottom surface of the circular groove 13.

[0025] Furthermore, on the outer side wall of the middle of the extending connection portion 33, an annular groove is formed. The left and right inner side walls of the annular groove are tapered wall surfaces. The outer side wall of the annular groove at the end where the two inner side walls are away from each other is larger than the inner side wall at the end where they are close to each other. The cross-section of the middle inner side wall of the annular groove is arc-shaped.

[0026] Furthermore, upper cover plates 2 are fixedly connected to the top surfaces of the left and right side plates of the safety pin mounting support 4 by bolts. The upper cover plates 2 cover the top surfaces of the corresponding middle grooves 41 and press against the top surfaces of the rotating shaft support portions 31.

[0027] Furthermore, the top surface of the pressing groove 12 is an arc-shaped wall surface, which cooperates with and closely abuts against the top surface of the central cylindrical portion 32.

[0028] The left and right end surfaces of the central cylindrical portion 32 and the left and right end surfaces of the pressing groove 12 are in the same vertical plane, and the left and right end surfaces of the pressing groove 12 are vertically aligned with the left and right side walls of the pressing mounting block 11.

[0029] When this embodiment is in use, the bottom surface of the safety pin mounting support 4 can be pressed against the top surface of the tray 10. Then, the two rotating shaft support portions 31 of the safety pin 3 are inserted into the corresponding middle grooves 41. Its bottom surface cooperates with and closely adheres to the bottom surface of the middle groove 41. The left and right end surfaces of the rotating shaft support portion 31 and the left and right end surfaces of the corresponding middle groove 41 are in the same vertical plane.

[0030] Then, manually hold the safety pin pressing disc 1 and place it above the safety pin mounting support 4. Insert the central cylindrical portion 32 into the pressing groove 12. The top surface of the central cylindrical portion 32 closely adheres to the top surface of the pressing groove 12. Then, by controlling the main body of the mechanical testing machine, the test pressure telescopic column 20 is lowered so that its bottom end is inserted into the circular groove 13. The outer side wall of the bottom end of the test pressure telescopic column 20 closely adheres to the inner side wall of the circular groove 13. Then, the hands holding the safety pin pressing disc 1 can be released. Then, as the test pressure telescopic column 20 continues to descend, its bottom surface presses against the bottom surface of the circular groove 13 and continues to press. Finally, the extended connecting portion 33 of the safety pin 3 is broken, so that the two rotating shaft support portions 31 and the central cylindrical portion 32 are disconnected. At this time, the detected value is the actual shear resistance data of the safety pin 3. Its structure is simple and easy to manufacture, making its detection accurate and having a good use effect.

Claims

1. A safety pin shearing force test device, comprising a main body of a mechanical testing machine. A tray (10) is installed at the lower part of the main body of the mechanical testing machine, and a test pressure telescopic column (20) is installed at the upper part of the main body of the mechanical testing machine. It is characterized in that: A safety pin mounting support (4) is placed on the top surface of the tray (10); In the middle of the top surfaces of the left and right side plates of the safety pin mounting support (4), a middle groove (41) extending downward is formed. The left and right ends of the middle groove (41) extend out of the left and right side walls of the corresponding side plates. The rotating shaft support parts (31) on the left and right parts of the safety pin (3) are inserted into the corresponding middle grooves (41), and the bottom surface of the rotating shaft support part (31) is pressed against the bottom surface of the corresponding middle groove (41); Above the safety pin mounting support (4), there is a safety pin pressing disc (1). In the middle of the bottom surface of the safety pin pressing disc (1), a pressing and mounting block (11) extending downward is formed. In the middle of the bottom surface of the pressing and mounting block (11), a pressing groove (12) penetrating left and right is formed. The central cylindrical part (32) in the middle of the safety pin (3) is inserted into the pressing groove (12), and the top surface of the central cylindrical part (32) is closely attached to the top surface of the pressing groove (12). The bottom end of the test pressure telescopic column (20) is pressed against the top surface of the safety pin pressing disc (1).

2. The safety pin shearing force test device according to claim 1, wherein: In the middle of the top surface of the safety pin pressing disc (1), a circular groove (13) is formed. The bottom end of the test pressure telescopic column (20) is inserted into the circular groove (13). The outer side wall of the bottom end of the test pressure telescopic column (20) is closely attached to the inner side wall of the circular groove (13), and the bottom surface of the test pressure telescopic column (20) is pressed against the bottom surface of the circular groove (13).

3. The shear force test device for a safety pin according to claim 1, characterized in that: The safety pin (3) includes two rotating shaft support parts (31) and a central cylindrical part (32). At both left and right ends of the central cylindrical part (32), extending connection parts (33) are formed. The outer ends of the two extending connection parts (33) are formed on the inner end surfaces of the corresponding rotating shaft support parts (31); The left and right end surfaces of the rotating shaft support part (31) and the left and right end surfaces of the corresponding middle groove (41) are in the same vertical plane. The bottom surface of the middle groove (41) is an arc-shaped wall surface. The rotating shaft support part (31) is a cylinder, and its bottom surface is matched with and closely attached to the bottom surface of the middle groove (41).

4. The safety pin shearing force test device according to claim 3, characterized in that: On the middle outer side wall of the extending connection part (33), an annular groove is formed. The left and right inner side walls of the annular groove are conical wall surfaces. The outer side wall of the annular groove at the end where the two inner side walls are far away from each other is larger than the inner side wall at the end where they are close to each other. The cross-section of the middle inner side wall of the annular groove is arc-shaped.

5. The shear force test device for a safety pin according to claim 1, characterized in that: On the top surfaces of the left and right side plates of the safety pin mounting support (4), upper cover plates (2) are fixedly connected by bolts. The upper cover plates (2) cover the top surface of the corresponding middle groove (41) and are pressed against the top surface of the rotating shaft support part (31).

6. The shear force test device for a safety pin according to claim 1, wherein: The top surface of the pressing groove (12) is an arc-shaped wall surface, which is matched with and closely abuts against the top surface of the central cylindrical part (32); The left and right end surfaces of the central cylindrical part (32) and the left and right end surfaces of the pressing groove (12) are in the same vertical plane. The left and right end surfaces of the pressing groove (12) are vertically aligned with the left and right side walls of the pressing and mounting block (11).

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