CN212275115U

CN212275115U - Spoke type pressure sensor

Info

Publication number: CN212275115U
Application number: CN202021421379.0U
Authority: CN
Inventors: 张茵琪; 陈辉; 邓刚; 冯珺; 张延亿; 张幸幸; 陈含; 温彦锋; 田继雪; 殷旗; 边京红
Original assignee: China Institute of Water Resources and Hydropower Research
Current assignee: China Institute of Water Resources and Hydropower Research
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2021-01-01
Anticipated expiration: 2030-07-17

Abstract

The utility model discloses a spoke formula pressure sensor, it includes the shell body, be provided with two first spokes and the second spoke of mutual superpose in the shell body, first spoke and second spoke are the trapezium structure, and connect through the connecting plate between first spoke and the second spoke, the second spoke is fixed on the shell body, foil gage has all been pasted outward to first spoke and second spoke, be provided with the stress column on the atress board of first spoke, the stress column extends outside the shell body, be provided with spacing post in the first spoke, and spacing post is fixed on the stress column, be provided with the clearance between spacing post and the connecting plate, the foil gage is connected with the connector lug electricity on the shell body. The utility model discloses a high accuracy, a wide range pressure sensor have overcome the shortcoming that can't guarantee precision and range simultaneously through hierarchical collaborative work.

Description

Spoke type pressure sensor

Technical Field

The utility model relates to a pressure sensor technical field, concretely relates to spoke formula pressure sensor.

Background

With the rapid development of the national economic and technological levels, more and more large-scale civil engineering, water conservancy, traffic and other engineering projects appear. The design and construction of the engineering projects need to obtain accurate design parameters of materials through tests. Small-sized test instruments cannot well meet the actual requirements of large-sized projects, and more large-sized test instruments are successfully researched and developed and put into use. In a large test, a pressure sensor with a large range needs to be used because the pressure is large, and the accuracy of the pressure sensor with the large range is generally low in practice. Triaxial test is the most commonly used test instrument in geotechnical test, and when carrying out triaxial compression test, initial stage stress ratio is less, and the stress when destroying is great relatively, often selects the pressure sensor that the range can satisfy peak stress in the experiment. Therefore, the problem of accurately measuring the pressure value in the whole test process is solved, and a pressure value in an initial stage and a high-pressure stage can be accurately measured.

SUMMERY OF THE UTILITY MODEL

The aforesaid to prior art is not enough, the utility model provides a spoke formula pressure sensor that measurement accuracy is high.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows:

the utility model provides a spoke formula pressure sensor, it includes the shell body, be provided with two first spokes and the second spoke of mutual superpose in the shell body, first spoke and second spoke are the trapezium structure, and connect through the connecting plate between first spoke and the second spoke, the second spoke is fixed on the shell body, all post strain gage outside first spoke and the second spoke, be provided with the stress column on the stress plate of first spoke, the stress column extends outside the shell body, be provided with spacing post in the first spoke, and spacing post is fixed on the stress plate, be provided with the clearance between spacing post and the connecting plate, the strain gage is connected with the connector lug electricity on the shell body.

The utility model has the advantages that: the pressure sensor can work in a grading and cooperative mode, pressure is borne by the first spoke in a stage of small pressure, the measuring range of the first spoke is small, and the measuring precision is high; when the pressure is high, the limiting column contacts the connecting plate, the first spoke stops deforming, the second spoke bears the pressure, and the pressure in the high pressure stage is measured.

The utility model is a high-precision and wide-range pressure sensor, which overcomes the defect that the precision and the range can not be ensured simultaneously through the grading cooperative work; when the pressure is low, the pressure is measured by the first spoke, along with the increase of the pressure, after the first spoke reaches the limit, the measured value of the first spoke is not changed any more, and the pressure measured by the second spoke is read at the moment.

Drawings

Fig. 1 is a schematic structural diagram of a spoke type pressure sensor.

The device comprises a shell body 1, an outer shell body 2, a fixing plate 3, a second spoke 4, a connecting plate 5, a guide hole 6, a strain gauge 7, a connector lug 8, a first spoke 9, a return spring 10, a limiting column 11, a stress plate 12, a bearing plate 13, a stress column 14 and a screw hole.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art within the spirit and scope of the present invention as defined and defined by the appended claims.

As shown in fig. 1, the spoke type pressure sensor of this scheme includes shell body 1, be provided with two first spokes 8 and the second spoke 3 of mutual superpose in the shell body 1, first spoke 8 and second spoke 3 are the trapezium structure, and connect through connecting plate 4 between first spoke 8 and the second spoke 3, second spoke 3 is fixed on shell body 1, first spoke 8 and second spoke 3 are all pasted with foil gage 6 outward, be provided with stress column 13 on the stress plate 11 of first spoke 8, stress column 13 runs through shell body 1 and extends outside shell body 1, be provided with spacing post 10 in the first spoke 8, and spacing post 10 is fixed on stress plate 11, be provided with the clearance between spacing post 10 and the connecting plate 4, foil gage 6 is connected with the connector lug 7 electricity on the shell body 1.

The pressure sensor can work in a grading and cooperative mode, the first spoke 8 bears pressure at the stage of low pressure, the measuring range of the first spoke 8 is small, and the measuring precision is high; during the high pressure stage, the limiting column 10 contacts the connecting plate 4, the first spoke 8 stops deforming, the second spoke 3 bears pressure at the moment, the pressure after the high pressure stage is measured, and the strain gauge 6 detects a deformation signal and outputs the deformation signal through the connector lug 7.

The utility model is a high-precision and wide-range pressure sensor, which overcomes the defect that the precision and the range can not be ensured simultaneously through the grading cooperative work; when the pressure is low, the pressure is measured by the first spoke 8, along with the increase of the pressure, after the first spoke 8 reaches the limit, the measurement value of the first spoke 8 does not change any more, and the pressure measured by the second spoke 3 is read at the moment.

In the scheme, a return spring 9 is arranged between the stress plate 11 and the connecting plate 4, and the return spring 9 helps the first spoke 8 to return; be provided with bullport 5 on the shell body 1, the atress post 13 passes bullport 5, and during the pressure measurement, the device pushes down atress post 13, and bullport 5 can effectively prevent 13 squints of atress post, avoids shell body 1 to damage.

Be provided with fixed plate 2 on the shell body 1, be provided with a plurality of screw holes 14 on the fixed plate 2, fixed plate 2 and second spoke 3 are through a plurality of screw fixed connection, and the screw is absorbed in screw hole 14 in, and shell body 1 passes through fixed plate 2 to be fixed on the device, carries out pressure measurement. The bearing plate 12 is arranged at the end part of the stress column 13, and a plurality of bolt holes are formed in the bearing plate 12. This scheme is passed through fixed plate 2 and loading board 12 and is fixed on the device, and pressure is measured, through loading board 12 and the 2 atress of fixed plate, whole sensor stable in structure.

Claims

1. The spoke type pressure sensor is characterized by comprising an outer shell (1), wherein two first spokes (8) and two second spokes (3) which are mutually overlapped are arranged in the outer shell (1), the first spokes (8) and the second spokes (3) are both of a trapezoidal structure, the first spokes (8) and the second spokes (3) are connected through a connecting plate (4), the second spokes (3) are fixed on the outer shell (1), strain gauges (6) are attached to the outer portions of the first spokes (8) and the second spokes (3), stress columns (13) are arranged on stress plates (11) of the first spokes (8), the stress columns (13) extend out of the outer shell (1), limiting columns (10) are arranged in the first spokes (8), the limiting columns (10) are fixed on the stress plates (11), gaps are formed between the limiting columns (10) and the connecting plate (4), the strain gauge (6) is electrically connected with a connector lug (7) on the outer shell (1).

2. A spoke pressure sensor according to claim 1, wherein a return spring (9) is arranged between the force-bearing plate (11) and the connecting plate (4).

3. A spoke type pressure sensor according to claim 1, wherein the outer casing (1) is provided with a fixing plate (2), the fixing plate (2) is provided with a plurality of screw holes (14), the fixing plate (2) is fixedly connected with the second spoke (3) through a plurality of screws, and the screws are sunk into the screw holes (14).

4. A spoke pressure sensor according to claim 1, wherein the outer casing (1) is provided with a guide hole (5), and the force-bearing column (13) passes through the guide hole (5).

5. A spoke type pressure sensor according to claim 1, wherein the bearing plate (12) is arranged at the end of the stress column (13), and a plurality of bolt holes are arranged on the bearing plate (12).