Pressure Instrument Verification Device and Pressure Verification Method

Abstract

The present invention discloses a pressure instrument calibration device, which includes a pre-pressure box and a pressure stabilization box. A pressure conduction mechanism is provided between the pre-pressure box and the pressure stabilization box. One end of the pressure conduction mechanism is connected to the pre-pressure box, and the other end is connected to the pressure stabilization box. A pre-pressure chamber is formed inside the pre-pressure box, and a first adjusting member is provided in the pre-pressure chamber. The outer peripheral wall of the first adjusting member abuts against the inner wall of the pre-pressure chamber, and a first lifting mechanism is provided on the first adjusting member. A pressure stabilization chamber is formed inside the pressure stabilization box, and a second adjusting member is provided in the pressure stabilization chamber. The outer peripheral wall of the second adjusting member abuts against the inner wall of the pressure stabilization chamber, and a second lifting mechanism is provided on the second adjusting member. A calibration mechanism is provided at the top of the mounting frame. The calibration mechanism includes a connecting pipe. The bottom end of the connecting pipe passes through the pressure stabilization box and extends into the pressure stabilization chamber. At least two calibration pipes are provided on the connecting pipe, and an electric control valve is provided on each calibration pipe. The present invention can satisfy the simultaneous measurement of pressure instruments with different measurement ranges and improve the calibration efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure instrument detection, and in particular relates to a pressure instrument calibration device and a pressure calibration method. Background Art

[0002] A pressure gauge is an instrument used to measure pressure and is widely used in industrial process control and technical measurement.

[0003] The existing double-station semi-automatic calibration equipment used for pressure instrument calibration mainly detects pressure instruments through pressure control. During use, since the pressure is constant, only pressure instruments with the same measuring range can be tested during the detection process, and it is impossible to simultaneously test pressure instruments with different measuring ranges. Summary of the Invention

[0004] The object of the present invention is to provide a pressure instrument calibration device and a pressure calibration method, which can meet the purpose of simultaneously measuring pressure instruments with different measuring ranges and improve calibration efficiency.

[0005] The above-mentioned objectives are achieved by the following technical solutions.

[0006] The present invention provides a pressure instrument calibration device, comprising a mounting frame, wherein a mounting area is formed in the mounting frame, a pre-pressurization box and a pressure stabilization box are arranged in the mounting area, and a plurality of conduits are arranged between the pre-pressurization box and the pressure stabilization box, wherein one end of the conduit is connected to the pre-pressurization box and the other end is connected to the pressure stabilization box;

[0007] A pre-compression chamber is formed in the pre-compression box, and a first adjusting member is provided in the pre-compression chamber, wherein the outer peripheral wall of the first adjusting member presses against the inner wall of the pre-compression chamber, and a first lifting rod is provided in the pre-compression chamber, wherein the first adjusting member is liftably sleeved on the first lifting rod, and the first adjusting member is connected to a first rotating member at the bottom end of the first lifting rod;

[0008] A pressure stabilizing chamber is formed in the pressure stabilizing box, a second adjusting member is provided in the pressure stabilizing chamber, an outer peripheral wall of the second adjusting member presses against an inner wall of the pressure stabilizing chamber, and a second lifting rod is provided in the pressure stabilizing chamber, the second adjusting member is liftably sleeved on the second lifting rod, and a second rotating member is connected to the bottom end of the second lifting rod;

[0009] A calibration mechanism is provided above the mounting frame, and the calibration mechanism includes a connecting pipe, the bottom end of which passes through the mounting frame and the pressure stabilizing box and extends into the pressure stabilizing cavity. At least two calibration tubes are provided on the connecting pipe, and each calibration tube is provided with an electric control valve.

[0010] In some of these embodiments, the first lifting rod is disposed within the first pressure regulating region. The top end of the first lifting rod is connected to the top wall of the preloading chamber, and the bottom end passes through the preloading box and the mounting bracket and extends below the mounting bracket. A first rotating member is connected to the bottom end of the first lifting rod.

[0011] In some of these embodiments, a second partition is provided within the pressure stabilizing chamber. A second pressure regulating region is formed between one side of the second partition and the chamber wall of the pressure stabilizing chamber, and a pressure transfer region is formed between the other side of the second partition and the chamber wall of the pressure stabilizing chamber. A second gap is formed between the top or bottom end of the second partition and the pressure stabilizing chamber, and the other end of the pressure conduction mechanism communicates with the pressure transfer region.

[0012] In some of these embodiments, the second lifting rod is disposed within the second pressure regulating region. The top end of the second lifting rod is connected to the top wall of the pressure stabilizing chamber, and the bottom end passes through the pressure stabilizing box and the mounting bracket and extends below the mounting bracket. A second rotating member is connected to the bottom end of the second lifting rod.

[0013] In some of these embodiments, an air source connector is provided on the outer wall of the preloading box. The air source connector is in a three-way shape with three interfaces, and at least one of the interfaces communicates with the preloading chamber.

[0014] In some of these embodiments, a control valve and a shut-off valve are provided on each of the conduits.

[0015] In some of these embodiments, the calibration mechanism includes a shunt pipe. A connecting pipe is provided at the bottom of the shunt pipe, and at least two calibration pipes are provided on the shunt pipe. Self-sealing connectors are provided on the calibration pipes.

[0016] In some of these embodiments, a support rod is provided at the bottom of the mounting bracket, and at least one side of the mounting area is open. The preloading box is disposed at a position close to the opening.

[0017] The present invention also provides a pressure calibration method.

[0018] Inject gas into the preloading chamber of the preloading box through the air source connector until the air pressure reaches a preset pressure value, and then cut off the input of the air source connector.

[0019] Transfer the gas in the preloading chamber to the pressure stabilizing chamber of the pressure stabilizing box through the conduit until the air pressure in the pressure stabilizing chamber reaches the preset pressure value, and then cut off the conduit.

[0020] Transfer the gas in the pressure stabilizing chamber to a plurality of calibration pipes through the connecting pipe. When the air pressure on each calibration pipe reaches the preset pressure value of the electro-control valve, the electro-control valve opens to detect the pressure measuring instrument to be tested mounted on the calibration pipe.

[0021] The pressure gauge calibration device provided by the present invention, on the one hand, is provided with a pressure conduction mechanism between the pre-pressure box and the pressure stabilization box. A connecting pipe communicating with its pressure stabilization cavity is connected to the pressure stabilization box. At least two calibration pipes are provided on the connecting pipe, and an electric control valve is provided on the calibration pipe. During use, after filling the pre-pressure cavity with gas to reach a preset pressure value, the gas in the pre-pressure cavity of the pre-pressure box is sent into the pressure stabilization cavity of the pressure stabilization box through a conduit, so that the pressure in the pressure stabilization cavity reaches the preset pressure value, and then it is sent to the calibration pipe of the calibration mechanism through the connecting pipe. When the pressure reaches the preset pressure value of the electric control valve on the calibration pipe, the electric control valve automatically opens to detect the instrument to be detected installed on the calibration pipe. As long as the opening pressure value of the electric control valve is set according to the detection range of the instrument to be detected installed on the calibration pipe, it is possible to simultaneously detect multiple instruments to be detected on different sides, improving the calibration efficiency;

[0022] On the other hand, a first adjusting member is provided in the pre-pressure cavity. The outer peripheral wall of the first adjusting member abuts against the inner wall of the pre-pressure cavity. A first lifting rod is provided on the first adjusting member. A second adjusting member is provided in the pressure stabilization cavity. The outer peripheral wall of the second adjusting member abuts against the inner wall of the pressure stabilization cavity. A second lifting rod is provided on the second adjusting member. During use, the position of the first adjusting member in the pre-pressure cavity is adjusted through the first lifting rod, thereby adjusting the volume of the pre-pressure cavity. The position of the second adjusting member in the pressure stabilization cavity is adjusted through the second lifting rod to adjust the volume of the pressure stabilization cavity, so as to be adapted to the situation where the pressure requirements in the pre-pressure cavity and the pressure stabilization cavity are small, or the volume to be calibrated is small. Description of the Drawings

[0023] Figure 1 is the structural schematic diagram of the present invention;

[0024] Figure 2 is the schematic diagram of the mechanism of the present invention with the mounting bracket removed;

[0025] Figure 3 is the section Figure 1 ;

[0026] Figure 4 is the section Figure 2 ;

[0027] Figure 5 is the Figure 4 partial enlarged view of part A of the present invention.

[0028] Description of the Reference Numerals:

[0029] 10. Mounting bracket; 101. Mounting area; 102. Support rod;

[0030] 20. Pre-pressure box; 201. Pre-pressure chamber; 2011. First adjustment area; 2012. Pressure transmission area; 2013. First gap; 202. First adjustment member; 203. First partition; 204. Gas source connector;

[0031] 30. Voltage stabilization box; 301. Voltage stabilization chamber; 3011. Second adjustment area; 3012. Pressure transfer area; 3013. Second gap; 302. Second adjustment member; 303. Second partition;

[0032] 401. Connecting pipe; 402. Shunt pipe; 403. Verification pipe; 501. Conduit; 502. Control valve; 503. Switch valve; 601. First lifting rod; 602. First rotating member; 701. Second lifting rod; 702. Second rotating member;

[0033] 80. Self-sealing connector; 800. Quick connector; 8001. Clamping piece; 8002. Limiting ring; 801. Pressure transmission pipe; 8011. Medium channel; 8012. Air inlet hole; 803. Return spring; 804. Upper end plate; 805. Lower end plate; 806. Sealing ring; 807. Clamping area; 90. Standard pressure gauge. Detailed implementation manners

[0034] For the convenience of understanding the present invention, the specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings of the specification.

[0035] Unless otherwise specified or defined, the "first, second..." used herein is only for distinguishing names and does not represent a specific quantity or order.

[0036] Unless otherwise specified or defined, the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] It should be noted that the "fixed to" and "connected to" herein can be directly fixed or connected to an element, or indirectly fixed or connected to an element.

[0038] As Figures 1 to 5 shown, a pressure gauge verification device includes a mounting frame 10. At the bottom of the mounting frame 10, there are a plurality of support rods 102 for supporting the mounting frame 10. Inside the mounting frame 10, there is a mounting area 101. Inside the mounting area 101, there are a pre-pressure box 20 and a voltage stabilization box 30. Between the pre-pressure box 20 and the voltage stabilization box 30, there is a pressure conduction mechanism. One end of the pressure conduction mechanism is connected to the pre-pressure box 20, and the other end is connected to the voltage stabilization box 30, for introducing the gas in the pre-pressure chamber 201 into the voltage stabilization box 30.

[0039] At least one side of the installation area 101 is open, and the pre-pressure box 20, the pressure stabilizing box 30 and the pressure conduction mechanism are loaded into the installation area 101 from the opening, and the pre-pressure box 20 is arranged at a position close to the opening for facilitating connection with an external air supply source.

[0040] A pre-pressure cavity 201 is arranged in the pre-pressure box 20, and an air source connector 204 is arranged on the outer wall of the pre-pressure box 20. The air source connector 204 is provided with at least two interfaces, one of the interfaces communicates with the pre-pressure cavity 201, and the other interface is used for connecting with an external air supply source.

[0041] The air source connector 204 described in this embodiment is in a three-way shape and forms three interfaces. The interface close to the pre-pressure box 20 passes through the pre-pressure box 20 and communicates with the pre-pressure cavity 201. One of the interfaces far from the pre-pressure box 20 is used for connecting with an external air supply source, and the other interface is used for connecting a standard pressure gauge 90 to achieve the purpose of detecting the air pressure in the pre-pressure cavity 201.

[0042] A first partition plate 203 is arranged in the pre-pressure cavity 201. The first partition plate 203 divides the pre-pressure cavity 201 into a first adjustment area 2011 and a pressure transmission area 2012. Any one end of the top or bottom end of the first partition plate 203 is connected to the cavity wall of the pre-pressure cavity 201, and a first gap 2013 is formed between the other end and the cavity wall of the pre-pressure cavity 201. The first adjustment area 2011 and the pressure transmission area 2012 are communicated through the first gap 2013.

[0043] A first adjustment member 202 is arranged in the first adjustment area 2011. The outer peripheral wall of the first adjustment member 202 abuts against the inner wall of the pre-pressure cavity 201 and the first partition plate 203. A first lifting mechanism is arranged on the first adjustment member 202. The first lifting mechanism includes a first lifting rod 601. The top end of the first lifting rod 601 is connected to the cavity wall of the pre-pressure cavity 201, and the bottom end passes through the pre-pressure box 20 and the mounting frame 10 and extends below the mounting frame 10. A first rotating member 602 is arranged at the bottom end of the first lifting rod 601 for holding and rotating the first rotating member 602 to drive the first lifting rod 601 to rotate in the first adjustment area 2011.

[0044] An external thread is provided on the outer peripheral wall of the first lifting rod 601. A first mounting hole (not shown in the figure, the same below) is provided in the first adjusting member 202, and an internal thread is provided on the inner wall of the first mounting hole. The first adjusting member 202 is sleeved on the first lifting rod 601 through the first mounting hole, and the internal thread cooperates with the external thread. During use, when the first lifting rod 601 rotates, the first adjusting member 202 moves up and down on the first lifting rod 601 through the cooperation of the internal thread and the external thread to adjust the volume of the first adjusting area 2011, which is adapted to the situation where the pressure requirement in the pre-pressure chamber 201 is small or the volume to be inspected is small.

[0045] A pressure stabilizing chamber 301 is provided in the pressure stabilizing box 30. A second partition plate 303 is provided in the pressure stabilizing chamber 301. The second partition plate 303 divides the pressure stabilizing chamber 301 into a second adjusting area 3011 and a pressure transfer area 3012. Any one end of the top or bottom of the second partition plate 303 is connected to the inner wall of the pressure stabilizing chamber 301, and a second gap 3013 is formed between the other end and the inner wall of the pressure stabilizing chamber 301. The second adjusting area 3011 and the pressure transfer area 3012 communicate through the second gap 3013.

[0046] A second adjusting member 302 is provided in the second adjusting area 3011. The outer peripheral wall of the second adjusting member 302 abuts against the inner wall of the pressure stabilizing chamber 301 and the second partition plate 303, and a second lifting rod 701 is provided on the second adjusting member 302. The top end of the second lifting rod 701 is connected to the chamber wall of the pressure stabilizing chamber 301, and the bottom end passes through the pressure stabilizing box 30 and the mounting rack 10 and extends below the mounting rack 10. A second rotating member 702 is provided at the bottom end of the second lifting rod 701 for holding and rotating the second rotating member 702 to drive the first lifting rod 601 to rotate in the second adjusting area 3011.

[0047] An external thread is provided on the outer peripheral wall of the second lifting rod 701. A second mounting hole (not shown in the figure, the same below) is provided in the second adjusting member 302. The second adjusting member 302 is sleeved on the second lifting rod 701 through the second mounting hole, and an internal thread is provided on the inner wall of the second mounting hole. The internal thread cooperates with the external thread. During use, when the second lifting rod 701 rotates, the second adjusting member 302 moves up and down on the second lifting rod 701 through the cooperation of the internal thread and the external thread to adjust the volume of the second adjusting area 3011, which is adapted to the situation where the pressure requirement in the pressure stabilizing chamber 301 is small or the volume to be inspected is small.

[0048] A standard pressure gauge 90 for detecting the air pressure in the pressure stabilizing chamber 301 is provided on the pressure stabilizing box 30.

[0049] The pressure conduction mechanism includes a plurality of conduits 501. One end of each conduit 501 communicates with the pressure delivery area 2012, and the other end communicates with the pressure transfer area 3012. A control valve 502 is provided on each conduit 501 to control the flow rate of the gas in the pressure delivery area 2012 entering the pressure transfer area 3012.

[0050] A switching valve 503 is provided on each conduit 501, and the switching valve 503 is used to control the on-off of the conduit 501.

[0051] An inspection mechanism is provided above the mounting bracket 10. The inspection mechanism includes a shunt pipe 402. A connecting pipe 401 is provided at the bottom end of the shunt pipe 402. The bottom end of the connecting pipe 401 passes through the mounting bracket 10 and the pressure stabilizing tank 30 and extends into the pressure stabilizing cavity 301, and is located in the pressure transfer area 3012 to convey the air pressure in the pressure stabilizing cavity 301 into the shunt pipe 402.

[0052] At least two inspection pipes 403 are provided on the shunt pipe 402. An electric control valve (not shown in the figure, the same below) is provided on each inspection pipe 403. A pressure gauge to be measured is connected to the inspection pipe 403. During use, when the pressure conveyed to the inspection pipe 403 in the shunt pipe 402 reaches the pressure value set on the electric control valve, the electric control valve opens to send the gas into the pressure gauge to be measured for detection. A standard pressure gauge 90 is provided on the shunt pipe 402, and the accuracy of the pressure gauge to be measured is judged by comparing the data of the standard pressure gauge 90 with that of the pressure gauge to be measured.

[0053] A self-sealing connector 80 is provided on the inspection pipe 403. The top end of the self-sealing connector 80 is a quick connector 800 for connecting the instrument to be detected. The quick connector 800 is an existing elastic quick connector 800, including a limiting ring 8002 and a plurality of clamping pieces 8001 arranged in the limiting ring 8002. The plurality of clamping pieces 8001 surround to form a clamping area 807. The limiting ring 8002 is elastically sleeved on the self-sealing connector 80 in a liftable manner. During use, press the limiting ring 800 to descend so that the top ends of the plurality of clamping pieces 8001 extend outside the limiting ring 8002, and the clamping pieces 8001 incline outwards to expand the volume of the clamping area 807. Install the instrument to be detected into the clamping area 807, and release the limiting ring 8002. The limiting ring 8002 elastically resets to limit the position of the clamping pieces 8001, and the instrument to be detected is clamped and fixed in the clamping area 807.

[0054] A through hole (not shown in the figure, the same below) is provided in the self-sealing connector 80. A liftable pressure delivery pipe 801 is provided in the through hole. A medium channel 8011 is formed in the pressure delivery pipe 801. The top end of the medium channel 8011 communicates with the clamping area 807. An upper end plate 804 is provided at the top end of the pressure delivery pipe 801. A receiving groove (not shown in the figure, the same below) is provided at the top end of the self-sealing connector 80. Two oppositely arranged compression grooves (not shown in the figure, the same below) are provided in the receiving groove. Two oppositely arranged return springs 803 that are embedded in the compression grooves are provided at the bottom of the upper end plate 804. A lower end plate 805 is provided at the bottom end of the pressure delivery pipe 801. A plurality of air inlet holes 8012 that communicate with the medium channel 8011 are provided at a position on the outer peripheral wall of the pressure delivery pipe 801 close to the lower end plate 805. In the initial state, the upper end plate 804 is located above the receiving groove, the lower end plate 805 abuts against the bottom end of the self-sealing connector 80, the air inlet holes 8012 are located in the through hole, and the self-sealing connector 80 is disconnected from the verification tube 403. When a meter to be detected is installed in the clamping area 807, the bottom end of the meter to be detected presses against the upper end plate 804, causing the return spring 803 to be in a compressed state. The upper end plate 804 is embedded in the receiving groove, and the lower end plate 805 extends downward so that the air inlet holes 8012 extend out of the through hole and are in communication with the verification tube 403, achieving the purpose of automatic conduction after installing the meter to be detected and automatic sealing after removing the meter to be detected.

[0055] Sealing rings 806 are provided between the bottom end of the upper end plate 804 and the receiving groove, and between the top end of the lower end plate 805 and the bottom end of the self-sealing connector 80.

[0056] The pressure verification method of the pressure gauge verification device provided in this embodiment, when in use, first conveys gas into the pre-pressure chamber 201 through an external gas supply source via the gas source connector 204 until the gas pressure in the pre-pressure chamber 201 reaches a preset pressure value and then stops conveying. Then, the conduit 501 is opened through the switch valve 503, and the gas flow is controlled through the control valve 502. According to the usage requirements, different numbers of conduits 501 are opened to send the gas in the pre-pressure chamber 201 into the pressure stabilization chamber 301 until the pressure value in the pressure stabilization chamber 301 reaches the preset pressure value and then the conduit 501 is shut off. The gas in the pressure stabilization chamber 301 is sent into the shunt tube 402 through the connecting tube 401 and shunted into each verification tube 403. The electromagnetic valve on the verification tube 403 controls the opening or disconnection of the verification tube 403 and the self-sealing connector 80 according to the presence or absence of the instrument to be detected on the self-sealing connector 80 and whether the gas pressure input to the verification tube 403 reaches the preset pressure value, which can achieve the effect of opening the verification tube 403 equipped with the instrument to be detected and disconnecting the verification tube 403 without the instrument to be detected, and achieve the purpose of measuring multiple pressure gauges to be detected and simultaneously measuring pressure gauges to be detected with different measurement ranges.

[0057] For the pressure gauge verification device provided in this embodiment, on the one hand, a pressure conduction mechanism is provided between the pre-pressure box 20 and the pressure stabilization box 30. A connecting tube 401 that conducts the pressure stabilization chamber 301 is connected to the pressure stabilization box 30. At least two verification tubes 403 are provided on the connecting tube 401, and an electromagnetic valve is provided on the verification tube 403. When in use, after filling the pre-pressure chamber 201 with gas to reach the preset pressure value, the gas in the pre-pressure chamber 201 of the pre-pressure box 20 is sent into the pressure stabilization chamber 301 of the pressure stabilization box 30 through the pressure conduction mechanism, so that the pressure in the pressure stabilization chamber 301 reaches the preset pressure value, and then is sent to the verification tube 403 of the verification mechanism through the connecting tube 401. When the pressure reaches the preset pressure value of the electromagnetic valve on the verification tube 403, the electromagnetic valve automatically opens to detect the instrument to be detected installed on the verification tube 403. As long as the opening pressure value of the electromagnetic valve is set according to the detection range of the instrument to be detected installed on the verification tube 403, the detection of multiple instruments to be detected on different sides can be achieved simultaneously, improving the verification efficiency;

[0058] On the other hand, by arranging a first adjusting member 202 in the pre-pressurization chamber 201, the outer peripheral wall of the first adjusting member 202 is pressed against the inner wall of the pre-pressurization chamber 201. A first lifting mechanism is arranged on the first adjusting member 202. A second adjusting member 302 is arranged in the pressure stabilization chamber 301, and the outer peripheral wall of the second adjusting member 302 is pressed against the inner wall of the pressure stabilization chamber 301. A second lifting rod 701 is arranged on the second adjusting member 302. During use, the position of the first adjusting member 202 in the pre-pressurization chamber 201 is adjusted through the first lifting mechanism, thereby adjusting the volume of the pre-pressurization chamber 201. The position of the second adjusting member 302 in the pressure stabilization chamber 301 is adjusted through the second lifting rod 701 to adjust the volume of the pressure stabilization chamber 301, so as to be adapted to the situation where the pressure requirements in the pre-pressurization chamber 201 and the pressure stabilization chamber 301 are small, or the volume to be inspected is small.

[0059] The above embodiments are not exhaustive listings based on the present invention. In addition, there may be multiple other embodiments not listed. Any substitution and improvement made without violating the concept of the present invention fall within the protection scope of the present invention.

Claims

1. Pressure instrument calibration device, characterized in that, It includes a mounting frame, within which a mounting area is formed. Inside the mounting area, a pre-pressure box and a pressure stabilizing box are provided. Between the pre-pressure box and the pressure stabilizing box, there are multiple conduits. One end of each conduit is connected to the pre-pressure box, and the other end is connected to the pressure stabilizing box; Inside the pre-pressure box, a pre-pressure chamber is formed. Inside the pre-pressure chamber, a first adjusting member is provided. The outer peripheral wall of the first adjusting member abuts against the inner wall of the pre-pressure chamber. And a first lifting rod is provided inside the pre-pressure chamber. The first adjusting member is slidably sleeved on the first lifting rod. The first adjusting member is connected to a first rotating member at the bottom end of the first lifting rod; Inside the pressure stabilizing box, a pressure stabilizing chamber is formed. Inside the pressure stabilizing chamber, a second adjusting member is provided. The outer peripheral wall of the second adjusting member abuts against the inner wall of the pressure stabilizing chamber. And a second lifting rod is provided inside the pressure stabilizing chamber. The second adjusting member is slidably sleeved on the second lifting rod. At the bottom end of the second lifting rod, a second rotating member is connected; Above the mounting frame, a calibration mechanism is provided. The calibration mechanism includes a connecting pipe. The bottom end of the connecting pipe passes through the mounting frame and the pressure stabilizing box and extends into the pressure stabilizing chamber. And at least two calibration pipes are provided on the connecting pipe. An electromagnetic control valve is provided on each calibration pipe; Inside the pre-pressure chamber, a first partition is provided. On one side of the first partition and the chamber wall of the pre-pressure chamber, a first pressure regulating area is formed. On the other side of the first partition and the chamber wall of the pre-pressure chamber, a pressure transmission area is formed. A first gap is formed between the top or bottom end of the first partition and the pre-pressure chamber. And one end of the conduit communicates with the pressure transmission area; Inside the pressure stabilizing chamber, a second partition is provided. On one side of the second partition and the chamber wall of the pressure stabilizing chamber, a second pressure regulating area is formed. On the other side of the second partition and the chamber wall of the pressure stabilizing chamber, a pressure transfer area is formed. A second gap is formed between the top or bottom end of the second partition and the pressure stabilizing chamber. And the other end of the conduit communicates with the pressure transfer area; The first lifting rod is arranged in the first pressure regulating area. The top end of the first lifting rod is connected to the top chamber wall of the pre-pressure chamber. The bottom end passes through the pre-pressure box and the mounting frame and extends below the mounting frame. And a first rotating member is connected to the bottom end of the first lifting rod.

2. The pressure gauge calibration device according to claim 1, wherein The second lifting rod is arranged in the second pressure regulating area. The top end of the second lifting rod is connected to the top chamber wall of the pressure stabilizing chamber. The bottom end passes through the pressure stabilizing box and the mounting frame and extends below the mounting frame. And a second rotating member is connected to the bottom end of the second lifting rod.

3. The pressure gauge calibration device according to claim 1, characterized in that, On the outer wall of the pre-pressure box, an air source connector is provided. The air source connector is in a three-way shape with three interfaces. And at least one of the interfaces communicates with the pre-pressure chamber.

4. The pressure gauge calibration device according to claim 1, characterized in that, A control valve and a switch valve are provided on each conduit.

5. The pressure gauge calibration device according to claim 1, wherein, The calibration mechanism includes a shunt pipe. At the bottom of the shunt pipe, the connecting pipe is provided. And at least two calibration pipes are provided on the shunt pipe. A self-sealing connector is provided on the calibration pipe.

6. The pressure gauge calibration device according to claim 1, characterized in that, At the bottom of the mounting frame, a support rod is provided. And at least one side of the mounting area is open. The pre-pressure box is arranged at a position close to the opening.

7. The pressure verification method of the pressure instrument verification device according to claim 1, characterized in that: Inject gas into the pre-pressure chamber of the pre-pressure box through the gas source connector until the air pressure reaches the preset pressure value, and then cut off the input of the gas source connector; Transport the gas in the pre-pressure chamber to the pressure stabilization chamber of the pressure stabilization box through the conduit until the air pressure in the pressure stabilization chamber reaches the preset pressure value, and then cut off the conduit; Transport the gas in the pressure stabilization chamber to multiple verification tubes through the connecting pipe. When the air pressure on each verification tube reaches the preset pressure value of the electromagnetic control valve, the electromagnetic control valve opens to detect the pressure instrument to be detected installed on the verification tube.

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