CN219532801U

CN219532801U - Bias calibration device of pressure testing machine

Info

Publication number: CN219532801U
Application number: CN202320173393.0U
Authority: CN
Inventors: 谷继磊; 王耀辉
Original assignee: Fujian Jiuding Engineering Quality Inspection Co ltd
Current assignee: Fujian Jiuding Engineering Quality Inspection Co ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-08-15
Anticipated expiration: 2033-02-06

Abstract

The utility model provides a bias calibration device of a pressure testing machine, which is arranged between an upper bearing plate and a lower bearing plate of the pressure testing machine, and comprises a test block, four strain gages and a strain collecting box, wherein the test block is of a steel cube structure, the strain gages are respectively stuck to the side surface center positions of the test block along the stress direction, and the strain gages are connected with the strain collecting box. The bias calibration device of the pressure testing machine, which is simple in structure and easy to manufacture, can ensure the parallelism of the upper contact surface and the lower contact surface of the bias calibration device and reduce the deviation of the self-contained equipment; and the bias calibration device has strong pressure resistance and does not have the possibility of lateral instability.

Description

Bias calibration device of pressure testing machine

Technical Field

The utility model relates to the field of pressure testing machines, in particular to a bias voltage calibrating device of a pressure testing machine.

Background

The pressure testing machine for testing the compressive strength of materials such as building materials has the condition that the eccentric load exists more or less, the load value detected by the influence of the eccentric load can cause unreliable test data, and the prior art detects whether the loading process of the pressure testing machine has the bias voltage or not through the bias voltage calibration device so as to carry out bias voltage correction on the pressure testing machine. As shown in fig. 1, a prior art bias calibration device 100 ' is shown, which is a sensor group formed by four load sensors 1 ', the four sensors 1 ' are symmetrically distributed on an X axis and a Y axis around a geometric center, upper and lower end surfaces are respectively fixed between an upper cover plate 3 ' and a lower cover plate 4 ' through bolts 2 ', a convex contact platform is arranged on the top of the upper cover plate 3 ' and the bottom surface of the lower cover plate 4 ' for simulating test blocks, and the bias calibration device 100 ' is placed between bearing plates of a pressure testing machine during measurement. However, the bias calibration device 100' is difficult to ensure the parallelism of the contact surfaces of the upper cover plate and the lower cover plate, if the contact surfaces are not parallel, the contact surfaces have deviation, and under the condition of large calibration load, the device has the possibility of lateral instability.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the bias calibration device of the pressure testing machine, which has a simple structure and is easy to manufacture, and can ensure the parallelism of the upper contact surface and the lower contact surface of the bias calibration device and reduce the deviation of the self-contained equipment; and the bias calibration device has strong pressure resistance and does not have the possibility of lateral instability.

The utility model is realized in the following way: the utility model provides a bias calibration device of pressure testing machine, bias calibration device sets up between the upper bearing plate and the lower bearing plate of pressure testing machine, bias calibration device includes a test block, four foil gage and a strain collection box, the test block is the cube structure of steel, the foil gage pastes respectively in the side central point of test block along the atress direction, the foil gage all connect in the strain collection box.

Further, the strain gauge is adhered to the side face of the test block through glue.

The utility model has the advantages that: according to the utility model, the steel cube test block is arranged, and 6 faces of the cube structure can be easily processed into mutually perpendicular faces, so that the parallelism of the upper contact face and the lower contact face of the test block is ensured, and the deviation of equipment is reduced; the steel material has strong pressure resistance, and the possibility of instability is avoided under the condition of increasing the calibration load; the four sides of the test block are respectively provided with strain gauges, and when the pressure testing machine loads the test block, the four strain gauges generate strain; the strain value of the strain gauge can be acquired by arranging the strain acquisition box. The bias calibration device of the pressure testing machine, which is simple in structure and easy to manufacture, can ensure the parallelism of the upper contact surface and the lower contact surface of the bias calibration device and reduce the deviation of the self-contained equipment; and the bias calibration device has strong pressure resistance and does not have the possibility of lateral instability.

Drawings

The utility model will be further described with reference to examples of embodiments with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a prior art bias calibration device.

FIG. 2 is a schematic diagram of a bias calibration device for a pressure testing machine according to the present utility model.

FIG. 3 is a schematic view of the operation state structure of the pressure calibration device of the present utility model.

Reference numerals figures: bias calibration device 100 ', sensor 1 ', bolt 2 ', upper cover plate 3 ', lower cover plate 4 ', bias calibration device 100, test block 1, strain gauge 2, strain collection box 3, pressure tester 200, upper bearing plate 201, lower bearing plate 202.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 2 and 3, in the bias calibration device 100 of the present utility model, the bias calibration device 100 is disposed between an upper bearing plate 201 and a lower bearing plate 202 of the pressure testing machine 200, the bias calibration device 100 includes a test block 1, four strain gages 2 and a strain collecting box 3, the test block 1 is a steel cube structure, the strain gages 2 are respectively adhered to the center of the side of the test block 1 along the stress direction, preferably, the strain gages 2 are adhered to the side of the test block 1 by glue, and the length direction of the resistance wire of the strain gages 2 is the same as the stress direction during calibration. The strain gauges 2 are all connected to the strain collection box 3, and the strain collection box 3 can collect strain values of the strain gauges 2.

By placing the bias calibration device 100 at the right center of the lower bearing plate 201 of the pressure testing machine 200, the lower bearing plate 202 is driven to move downwards by a cylinder, the bias calibration device 100 is loaded, the strain value of the strain gauge 2 is collected by the strain collection box 3, the strain value is analyzed by comparison, and when the four strain values differ greatly, the pressure testing machine 200 has bias.

The utility model has the advantages that: according to the utility model, the steel cube test block 1 is arranged, and 6 faces of the cube structure can be easily processed into mutually perpendicular faces, so that the parallelism of the upper contact face and the lower contact face of the test block 1 is ensured, and the deviation of equipment is reduced; the steel material has strong pressure resistance, and the possibility of instability is avoided under the condition of increasing the calibration load; by arranging the strain gauges 2 on the four sides of the test block 1 respectively, when the pressure testing machine 200 loads the test block 1, the four strain gauges 2 generate strain; the strain value of the strain gauge 2 can be acquired by providing the strain acquisition tank 3. The bias calibration device of the pressure testing machine, which is simple in structure and easy to manufacture, can ensure the parallelism of the upper contact surface and the lower contact surface of the bias calibration device and reduce the deviation of the self-contained equipment; and the bias calibration device has strong pressure resistance and does not have the possibility of lateral instability.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the utility model, and that equivalent modifications and variations of the utility model in light of the spirit of the utility model will be covered by the claims of the present utility model.

Claims

1. The utility model provides a bias calibration device of pressure testing machine, bias calibration device sets up between the upper bearing plate and the lower bearing plate of pressure testing machine, its characterized in that: the bias calibration device comprises a test block, four strain gages and a strain collection box, wherein the test block is of a steel cube structure, the strain gages are respectively stuck to the side face center positions of the test block along the stress direction, and the strain gages are connected with the strain collection box.

2. A bias calibration device for a pressure testing machine as claimed in claim 1, wherein: the strain gauge is adhered to the side face of the test block through glue.