CN108362259A - A kind of strain detection testing device applied to shafting - Google Patents

Abstract

The problem of a kind of strain detection testing device applied to shafting, belongs to shafting stress measurement technical field, and the present invention places inaccurate to solve existing product foil gauge position, is susceptible to error, and when test is loosely easy to fall off due to clamping.Upper half torus and opposite be mounted on of lower half torus are tested on axis, and one end of upper half torus is connected by the first adjusting bolt with one end of lower half torus；The other end of upper half torus is connected with limiting device, limiting device is connected by the second adjusting bolt with the other end of lower half torus, it is arranged in parallel with sliding rail on the inner wall of upper half torus and lower half torus, multiple sliding blocks are installed on sliding rail, foil gauge is mounted on each sliding block.A kind of strain detection testing device applied to shafting of the present invention quickly can accurately determine that foil gauge pastes position, and clamping is firm.

Description

A strain test device applied to shafting

technical field

The invention relates to a strain test device applied to a shaft system, belonging to the technical field of shaft system stress measurement.

Background technique

The main function of the shaft is to support rotating parts and transmit torque. It should have good processing and assembly technology, and try to avoid stress concentration. In actual engineering, due to complex working conditions (high-speed heavy loads under the action of torque, bending moment and axial force, etc.), structure and design, rotating mechanical equipment often has fracture accidents where the strength of the shaft system is destroyed, causing huge damage. Economic losses. Therefore, the accurate measurement of the strain and stress of the shaft system, the strength check during the design and production process, and the guarantee of the reliability and stability of the actual operation have great engineering practical significance and guiding functions, while the existing products are measured during the measurement The position is prone to error, and the strain gauge is easy to fall off.

Contents of the invention

The object of the present invention is to provide a strain testing device applied to shafting to solve the above problems.

A strain testing device applied to a shaft system includes an upper semi-annular body, a lower semi-annular body, a first adjusting bolt, a limit device, a second adjusting bolt, a slide rail, a slider and a strain gauge;

The upper semi-annular body and the lower semi-annular body are relatively installed on the test shaft, and one end of the upper semi-annular body is connected with one end of the lower semi-annular body by the first adjusting bolt; the other end of the upper semi-annular body is connected with The limit device is connected, and the limit device is connected with the other end of the lower semi-annular body through the second adjusting bolt. The inner walls of the upper semi-annular body and the lower semi-annular body are provided with slide rails in parallel. There are multiple sliders, and strain gauges are installed on each slider;

The limiting device includes a main body, a rotating shaft, a limiting block and a compression spring;

There is a circular groove on the main body, the circular groove is provided with an opening, the upper end of the opening is provided with a raised part, and the side walls on both sides below the raised part are provided with grooves, and a rotating shaft is arranged in the groove to limit One end of the positioning block is hinged on the rotating shaft, the other end is located in the opening, one end of the compression spring is connected with the inner wall of the groove, and the other end is connected with one side wall of the limiting block.

Preferably: an adjusting spring is sheathed on the first adjusting bolt, and the two ends of the adjusting spring abut against the upper semi-annular body and the lower semi-annular body respectively.

Preferably: the strain gauge is connected with the strain gauge.

Compared with the existing products, the present invention has the following effects: the sticking position of the strain gauge can be quickly and accurately determined, the operation is simple and fast, the error caused by manual operation is avoided, and the precise positioning of the test position is ensured. Moreover, because of the adjustment spring, it can be guaranteed that there is a certain error range between the positioning work and the shaft diameter, and the applicability is stronger. In addition, the designed device has simple structure, low cost and convenient processing. The limit device can effectively prevent the device from falling off.

Description of drawings

Fig. 1 is a schematic structural view of a strain testing device applied to shafting according to the present invention;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is a structural schematic diagram of a limiting device;

Figure 4 is an enlarged view of A in Figure 1;

Figure 5 is a schematic diagram of the structure during testing.

In the figure: 1-upper semi-circular body, 2-lower semi-circular body, 3-first adjusting bolt, 4-limiting device, 5-second adjusting bolt, 6-slide rail, 7-slider, 8 -strain gauge, 9-circular groove, 10-protrusion, 11-groove, 12-rotating shaft, 13-limit block, 14-compression spring, 15-test shaft, 16-adjusting spring.

Detailed ways

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Fig. 1 to Fig. 5, a strain test device applied to the shaft system according to the present invention includes an upper semi-annular body 1, a lower semi-annular body 2, a first adjusting bolt 3, a limit device 4, The second adjusting bolt 5, slide rail 6, slider 7 and strain gauge 8;

The upper semi-circular body 1 and the lower semi-circular body 2 are relatively installed on the test shaft 15, and one end of the upper semi-circular body 1 is connected with an end of the lower semi-circular body 2 by the first adjusting bolt 3; The other end of the ring body 1 is connected with the limit device 4, and the limit device 4 is connected with the other end of the lower semi-circular body 2 through the second adjusting bolt 5, and the upper semi-circular body 1 and the lower semi-circular body 2 A slide rail 6 is arranged in parallel on the inner wall of the slide rail 6, and a plurality of slide blocks 7 are installed on the slide rail 6, and a strain gauge 8 is installed on each slide block 7;

The limiting device 4 includes a main body, a rotating shaft 12, a limiting block 13 and a compression spring 14;

There is a circular groove 9 on the main body, and the circular groove 9 is provided with an opening, and the upper end of the opening is provided with a raised portion 10, and grooves 11 are formed on both side walls below the raised portion 10, and the groove 11 There is a rotating shaft 12 inside, one end of the limiting block 13 is hinged on the rotating shaft 12, the other end is located in the opening, one end of the compression spring 14 is connected with the inner wall of the groove 11, and the other end is connected with the side wall of the limiting block 13 connected.

Further: the first adjusting bolt 3 is covered with an adjusting spring 16 , and the two ends of the adjusting spring 16 abut against the upper semi-annular body 1 and the lower semi-annular body 2 respectively.

Further: the strain gauge 8 is connected with the strain gauge, which is the MYJ series strain gauge produced by Shanghai Automation Instrumentation Co., Ltd.

The designed strain experiment test device is mainly composed of shaft, positioning tool, wireless signal transmitter; receiver, strain gauge, acquisition instrument, computer and so on. Wherein the transmitter is pasted on the surface of the shaft or at the end of the shaft. Due to the high-speed operation of the shaft system under normal working conditions, the strain test device adopts a wireless test method. The strain gauge on the positioning tool is transmitted from the transmitter to the receiver in the form of a wireless signal, and the receiver transmits the signal to the strain gauge. The strain gauge amplifies the signal and inputs it to the acquisition instrument. The acquisition instrument should have at least 8 channels. Finally, the dynamic strain signal is sent to the computer for analysis and processing.

During use, it should be ensured that the end of the connection between the upper semi-annular body and the lower semi-annular body is horizontal, so as to ensure the accuracy of the position of the strain gauge patch. Slide rails are arranged on the upper semi-annular body and the lower semi-annular body, and the sliders on the sliding rails are used to determine the pasting positions of the strain gauges.

The designed strain test device adopts the wireless test method, which can quickly and accurately determine the sticking position of the strain gauge and ensure the precise positioning of the test position. Moreover, because of the adjustment spring, it can be guaranteed that there is a certain error range between the positioning work and the shaft diameter, and the applicability is stronger. In addition, the designed device has simple structure, low cost and convenient processing

This embodiment is only an exemplary description of this patent, and does not limit its protection scope. Those skilled in the art can also make partial changes to it, as long as it does not exceed the spirit and essence of this patent, all within the protection scope of this patent.

Claims (3)

1. A strain test device applied to shafting, characterized in that it comprises an upper semi-annular body (1), a lower semi-annular body (2), a first adjusting bolt (3), and a limit device (4) , the second adjusting bolt (5), slide rail (6), slider (7) and strain gauge (8); The upper semi-annular body (1) and the lower semi-annular body (2) are relatively installed on the test shaft (15), and one end of the upper semi-annular body (1) is connected with the lower semi-annular body through the first adjusting bolt (3). One end of the ring body (2) is connected; the other end of the upper half ring body (1) is connected with the limit device (4), and the limit device (4) is connected with the lower half circle by the second adjusting bolt (5). The other end of the ring body (2) is connected, and the inner wall of the upper semi-circular body (1) and the lower semi-circular body (2) is provided with slide rails (6) in parallel, and multiple The slide block (7), each slide block (7) is equipped with a strain gauge (8); The limiting device (4) includes a main body, a rotating shaft (12), a limiting block (13) and a compression spring (14); There is a circular groove (9) on the main body, the circular groove (9) is provided with an opening, the upper end of the opening is provided with a raised portion (10), and on the side walls on both sides below the raised portion (10) Both are provided with grooves (11), the grooves (11) are provided with a rotating shaft (12), one end of the limit block (13) is hinged on the rotating shaft (12), the other end is located in the opening, the compression spring (14) One end is connected with the inner wall of the groove (11), and the other end is connected with one side wall of the limiting block (13). 2. A strain testing device applied to shafting according to claim 1, characterized in that: the first adjusting bolt (3) is covered with an adjusting spring (16), and the two ends of the adjusting spring (16) They abut against the upper semi-annular body (1) and the lower semi-annular body (2) respectively. 3. A strain testing device applied to a shaft system according to claim 1, characterized in that: the strain gauge (8) is connected with a strain gauge.