CN203519252U - Calibration apparatus for calibrating soil pressure sensor by using fluid - Google Patents

Abstract

The utility model discloses a calibration apparatus for calibrating a soil pressure sensor by using fluid. The calibration apparatus is structured through the following manners that: a pressurizing hole and a water injection hole are formed in the top of a pressure cover; the pressurizing hole is connected with a first port of a three-way pipe at the exterior of the pressure cover; a second port of the three-way pipe is connected with a precision pressure gauge; a third port of the three-way pipe is connected with an air compressor through a pressure adjusting valve; a flange at the bottom of the pressure cover is connected with a base ring through a bolt; a rubber film and an O-shaped sealing ring are arranged between the flange and the base ring; the inner peripheral surface of the base ring is in threaded connection with the outer peripheral surface of a base disc; the center of the upper surface of the base disc is provided with a groove used for accommodating the soil pressure sensor; the groove is communicated with a vertically linear groove at the outer peripheral surface of the base disc through a horizontally linear groove of the upper surface of the base disc at a radial direction; and the lower surface of the base disc is provided with an inner hexagonal hole used in disassembly. The calibration apparatus is advantageous in accurate and reliable calibration results. When the calibration apparatus is adopted to perform calibration, a fluid medium will not enter the soil pressure sensor, and therefore, the success rate of a calibration test is high, and the soil pressure sensor will not be damaged.

Description

Calibration equipment for calibrating earth pressure sensor with fluid

technical field

The utility model relates to a calibration device for calibrating an earth pressure sensor with a fluid.

Background technique

Earth pressure sensors are widely used in earth pressure testing of geotechnical structures such as roadbeds, retaining walls, dams, and tunnels. The earth pressure sensor needs to be calibrated before use to grasp the relationship between the input pressure and the output signal, so as to improve the accuracy and reliability of the test.

The calibration of the earth pressure sensor is carried out by applying a solid load, that is, a solid load of a standard weight is applied to the earth pressure sensor, and its output value is calibrated. The problem with this method is that it is difficult to ensure that the force on the earth pressure sensor is uniform everywhere, resulting in large deviations in calibration results; this problem is particularly prominent for single-membrane earth pressure sensors. Another way is to use non-solid pressurization, that is, put the earth pressure sensor into the fluid medium, and calibrate its output value through the predicted or calculated pressure on the earth pressure sensor in the fluid medium. This method can ensure that the force of the earth pressure sensor is uniform everywhere, but because the sealing performance of the earth pressure sensor is insufficient, the fluid medium will enter the interior of the earth pressure sensor, resulting in calibration failure and even damage to the earth pressure sensor.

Utility model content

The technical problem to be solved by the utility model is to provide a calibration device that uses fluid to calibrate the earth pressure sensor. The calibration result of the calibration device is accurate and reliable; the fluid medium will not enter the interior of the earth pressure sensor during calibration, and the success rate of the calibration test is high. , will not damage the earth pressure sensor.

The utility model solves the technical problem. The adopted technical solution is a calibration device for calibrating an earth pressure sensor with a fluid, which is characterized in that:

The top of the pressure cover is provided with a water injection hole and a pressurization hole, the water injection hole is sealed with a sealing plug, the pressurization hole is connected to the first port of the tee pipe outside the pressure cover, the second port of the tee pipe is connected to a precision pressure gauge, three The third port of the through pipe is connected to the output end of the pressure regulating valve, and the input end of the pressure regulating valve is connected to the air compressor;

The flange at the bottom of the pressure cover is connected to the base ring through bolts, and a rubber film and an O-ring are placed between the flange and the base ring;

The inner peripheral surface of the base ring is threadedly connected with the outer peripheral surface of the base plate, and the center of the upper surface of the base plate has a groove for placing an earth pressure sensor. The vertical grooves on the outer peripheral surface are connected, and the center of the lower surface of the base plate has an inner hexagonal hole for disassembly.

The using method of the present utility model is:

Loosen the connection between the flange plate and the base ring, place the earth pressure sensor to be calibrated in the groove of the base plate, and lead the wire of the earth pressure sensor through the horizontal and vertical line grooves, and then rotate the base plate so that Its upper surface is flush with the base ring upper surface. Then the sealing ring and the rubber film are covered on the base plate and the base ring, and then the base ring is tightly connected with the flange plate of the pressure cover by bolts. Inject distilled water into the pressure cover through the water injection hole of the pressure cover to completely submerge the rubber membrane, and then seal the water injection hole with a sealing plug.

Start the air compressor, and make the air pressure in the pressure cover reach the set pressure of the calibration test through the pressure regulating valve and the precision pressure gauge, and then the calibration test can be carried out.

Compared with the prior art, the beneficial effects of the utility model are:

In the sealed pressure cover, the air pressure generated by the air compressor acts on the injected liquid, and the converted liquid pressure is evenly applied to the earth pressure sensor, avoiding the uneven pressure of the earth pressure sensor caused by the solid load calibration equipment problem, the error of the calibration result is small. Since there is a rubber membrane between the base plate where the earth pressure sensor is installed and the pressure cover, the rubber membrane has good flexibility and can transmit the liquid pressure to the earth pressure sensor well without disturbing the calibration results; at the same time, the rubber membrane transfers the fluid The medium is separated from the earth pressure sensor, the fluid medium will not enter the earth pressure sensor during calibration, the success rate of the calibration test is high, and the earth pressure sensor will not be damaged.

The above-mentioned rubber membrane has a diameter greater than that of the O-ring.

In this way, good sealing performance between the pressure cover, the base plate and the outer plate can be ensured.

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Detailed ways

Fig. 1 shows, a kind of specific embodiment of the present utility model is, a kind of calibration equipment with fluid calibration earth pressure sensor, its composition is:

The top of the pressure cover 1 is provided with a water injection hole 1a and a pressurization hole 1b, the water injection hole 1a is sealed with a sealing plug 2, the pressurization hole 1b is connected to the first port of the tee pipe 3 outside the pressure cover 1, and the first port of the tee pipe 3 The second port is connected to the precision pressure gauge 4, the third port of the tee pipe 3 is connected to the output end of the pressure regulating valve 5, and the input end of the pressure regulating valve 5 is connected to the air compressor 6;

The flange 1c at the bottom of the pressure cover 1 is connected to the base ring 7 through bolts 7a, and a rubber film 8 and an O-ring 9 are placed between the flange 1c and the base ring 7;

The inner peripheral surface of the base ring 7 is threadedly connected to the outer peripheral surface of the base plate 10, and the center of the upper surface of the base plate 10 has a groove 10a for placing an earth pressure sensor. The horizontal line groove 10c communicates with the vertical line groove 10b on the outer peripheral surface of the base plate 10, and the center of the lower surface of the base plate 10 has an inner hexagonal hole 10d for disassembly.

The diameter of the rubber membrane 8 in this example is larger than the diameter of the O-ring 9 .

Claims (2)

1. with fluid, demarcate a calibration facility for soil pressure sensor, it is characterized in that:

Pressure shield (1) top is provided with water injection hole (1a) and pressurization hole (1b), sealing-plug (2) sealing for water injection hole (1a), the first port of the three-way pipe (3) that pressurization hole (1b) is outer with pressure shield (1) is connected, the second port of three-way pipe (3) is connected with precision pressure gauge (4), the 3rd port of three-way pipe (3) is connected with the output terminal of pressure regulator valve (5), and the input end of pressure regulator valve (5) is connected with air compressor (6);

The ring flange (1c) of described pressure shield (1) bottom is connected with base ring (7) by bolt (7a), and is lined with rubber membrane (8) and O RunddichtringO (9) between ring flange (1c) and base ring (7);

The inner peripheral surface of described base ring (7) is threaded with the outer peripheral face of base disk (10), base disk (10) upper surface center is useful on the groove (10a) of placing soil pressure sensor, this groove (10a) is communicated with the vertical line groove (10b) of base disk (10) outer peripheral face by base disk (10) upper surface horizontal cable trough (10c) radially, and base disk (10) lower surface center is useful on the inner hexagonal hole (10d) of dismounting.

2. a kind of calibration facility of demarcating soil pressure sensor with fluid according to claim 1, is characterized in that: the diameter of described rubber membrane (8) is greater than the diameter of O RunddichtringO (9).

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