Multi-range automatic testing device and application method thereof

Abstract

The invention relates to the technical field of metering calibration, and discloses a multi-range automatic testing device and an application method thereof.In the testing device, the first end of each electric proportional valve is connected with an air source, and the second end of each electric proportional valve is connected with the first end of a corresponding front-end busbar; the second end of each front-end busbar is connected with the first ends of all the gas source lines; the first end of each rear-end busbar is connected with the second ends of all the gas source lines, and the second end of each rear-end busbar is connected with a tested device. By arranging a plurality of electric proportional valves, a plurality of front-end busbars, a plurality of gas source routes and a plurality of rear-end busbars, a plurality of gas paths are provided for the measurement of the pressure instruments, the air pressure is adjusted by controlling the opening degrees of the electric proportional valves, different air pressures are provided for different gas source routes, and a plurality of pressure instruments with different measuring ranges can be measured at the same time. And the multi-point calibration of the pressure range can be synchronously realized.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement and calibration, and in particular to a multi-range automatic testing device and an application method thereof. Background Art

[0002] Pressure gauges, pressure transmitters, pressure recorders and other pressure instruments need to be pressure checked (such as verification and calibration) before leaving the factory and during later use to ensure that the pressure instruments meet the specified technical indicators.

[0003] A pressure calibration instrument is an instrument used to calibrate the pressure of a pressure instrument. Usually, the range of a pressure calibration instrument is single, which limits the calibration range of the pressure calibration instrument. For certain measurement ranges, unless another pressure controller with the corresponding range is used, the calibration accuracy is affected by the range, resulting in the need for multiple pressure calibration instruments with multiple ranges when calibrating the pressure instrument, which brings inconvenience to on-site calibration. Summary of the invention

[0004] In view of this, the present invention provides a multi-range automatic testing device and an application method thereof to solve the problem that a plurality of pressure calibration instruments with various ranges are required when calibrating a pressure instrument.

[0005] In a first aspect, the present invention provides a multi-range automatic testing device, the multi-range automatic testing device comprising: a host computer, a plurality of electrical proportional valves, a plurality of front-end buses, a plurality of gas source routes, and a plurality of rear-end buses, wherein the number of the electrical proportional valves is consistent with the number of the front-end buses and the number of the rear-end buses, wherein:

[0006] The first end of each of the electrical proportional valves is connected to the gas source, and the second end of each of the electrical proportional valves is connected to the first end of the corresponding front-end bus;

[0007] The second end of each of the front-end bus bars is connected to the first ends of all gas source routes;

[0008] The first end of each rear-end bus is connected to the second ends of all gas source routes, and the second end of each rear-end bus is connected to the device under test;

[0009] The host computer is connected to all electrical proportional valves, all gas source routes, and all devices under test;

[0010] During the calibration, the host computer selects the electrical proportional valve and the gas source route that need to be turned on according to the number of devices under test and the upper limit of the measuring range of each device under test, and sends a turn-on instruction to them; the host computer collects the pressure data in the gas source route and the pressure data of the device under test, and calculates the error of the device under test.

[0011] A multi-range automatic testing device provided by the present invention provides multiple gas paths for pressure instrument measurement by setting multiple electrical proportional valves, multiple front-end bus bars, multiple gas source routes and multiple rear-end bus bars. The air pressure is adjusted by controlling the opening of the electrical proportional valves, and different air pressures are provided for different gas source routes. Several pressure instruments of different ranges can be measured at the same time, and multi-point calibration of the pressure range can be realized synchronously.

[0012] In an optional embodiment, each of the gas source routes includes a front-end solenoid valve group, a safety valve, a calibration table and a rear-end solenoid valve group, wherein:

[0013] The front-end solenoid valve group is connected to the safety valve, the calibration table, and the rear-end solenoid valve group in sequence.

[0014] In an optional embodiment, each of the front-end solenoid valve groups includes a plurality of front-end solenoid valves, wherein:

[0015] The plurality of front-end solenoid valves are connected in parallel, and each of the front-end solenoid valves is correspondingly connected to a front-end bus.

[0016] In an optional embodiment, each of the rear end solenoid valve groups includes a plurality of rear end solenoid valves, wherein:

[0017] A plurality of rear end solenoid valves are connected in parallel, and each of the rear end solenoid valves is correspondingly connected to a rear end bus.

[0018] In an optional implementation manner, each back-end bus is connected to a plurality of devices under test.

[0019] In an optional implementation, the multi-range automatic test device further includes: a test device lower computer, an electrical proportional valve drive device, a calibration table acquisition device and a solenoid valve drive device, wherein:

[0020] The first end of the lower computer of the test device is connected to the upper computer, and the second end of the lower computer of the test device is respectively connected to the electric proportional valve driving device, the calibration table acquisition device and the solenoid valve driving device;

[0021] The lower computer of the testing device receives the instruction of the upper computer, and sends the instruction to the electric proportional valve driving device, the calibration table acquisition device, and the solenoid valve driving device;

[0022] The electrical proportional valve driving device drives the corresponding electrical proportional valve to operate according to the instruction;

[0023] The solenoid valve driving device drives the corresponding front-end solenoid valve and rear-end solenoid valve to operate according to the instruction;

[0024] The calibration table acquisition device acquires pressure data of the corresponding calibration table according to the instruction, and uploads the pressure data to the host computer.

[0025] In an optional implementation, the multi-range automatic test device further includes: a lower computer of the device under test and a collection device of the device under test, wherein:

[0026] The first end of the lower computer of the device under test is connected to the upper computer, and the second end of the lower computer of the device under test is connected to the acquisition device of the device under test;

[0027] The lower computer of the device under test receives the instruction of the upper computer and sends the instruction to the acquisition device of the device under test;

[0028] The measured device acquisition device acquires pressure data of the corresponding measured device according to the instruction, and uploads the pressure data to the host computer.

[0029] In an optional embodiment, the multi-range automatic testing device further includes: an air compressor and a gas filter, wherein:

[0030] The first end of the gas filter is connected to the air compressor, and the second end of the gas filter is connected to the first ends of all the electrical proportional valves.

[0031] In a second aspect, the present invention provides an application method of a multi-range automatic testing device, the application method comprising:

[0032] The electrical proportional valve and gas source route that need to be turned on are selected according to the number of devices under test and the upper limit of the measuring range of each device under test;

[0033] Sending a conduction instruction to the electrical proportional valve and the gas source route that need to be conducted;

[0034] Collect the pressure data in the gas source route and the pressure data of the device under test, and calculate the error of the device under test.

[0035] The present invention provides an application method of a multi-range automatic testing device, which adjusts the air pressure by controlling the opening of an electric proportional valve, provides different air pressures for different air source routes, can measure several pressure instruments with different ranges at the same time, and can synchronously realize multi-point calibration of the pressure range.

[0036] In an optional embodiment, the application method further includes:

[0037] According to the pressure data in the gas source route and the pressure data of the device under test, pressure compensation is performed on the device under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a principle block diagram of a specific example of a multi-range automatic test device in an embodiment of the present invention;

[0040] Figure 2 It is a principle block diagram of another specific example of the multi-range automatic test device in the embodiment of the present invention;

[0041] Figure 3 It is a principle block diagram of another specific example of the multi-range automatic test device in the embodiment of the present invention;

[0042] Figure 4 The figure is a flow chart of an application method of a multi-range automatic testing device in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] The present invention provides a multi-range automatic testing device, such as Figure 1 As shown, it includes: a host computer, multiple electrical proportional valves, multiple front-end buses, multiple gas source routes, and multiple rear-end buses. The number of electrical proportional valves is consistent with the number of front-end buses and the number of rear-end buses. Among them, the first end of each electrical proportional valve is connected to the gas source, and the second end of each electrical proportional valve is connected to the first end of its corresponding front-end bus. The second end of each front-end bus is connected to the first end of all gas source routes. The first end of each rear-end bus is connected to the second end of all gas source routes, and the second end of each rear-end bus is connected to the device under test. The host computer is connected to all electrical proportional valves, all gas source routes, and all devices under test. When performing calibration, the host computer selects the electrical proportional valves and gas source routes that need to be turned on according to the number of devices under test and the upper limit of the range of each device under test, and sends a turn-on instruction to them; the host computer collects the pressure data in the gas source route and the pressure data of the device under test, and calculates the error of the device under test.

[0048] Specifically, during the calibration, the calibration personnel input the number of devices under test and the upper limit of the range of each device under test on the host computer. The host computer selects the electrical proportional valves and gas source routes that need to be turned on according to the number of devices under test and the upper limit of the range of each device under test, and sends a turn-on instruction to them, and sends a closing instruction to the electrical proportional valves and gas source routes that do not need to be turned on, thereby opening the test line. Then the multi-range automatic test device starts to perform the calibration work, controls the pressure equipment to start pressure, and adjusts the air pressure in different gas source routes by controlling the opening ratio of different electrical proportional valves, so as to achieve the purpose of calibrating pressure instruments of different ranges at the same time. At the same time, for the same electrical proportional valve, the air pressure is adjusted by controlling the opening ratio of the electrical proportional valve, so as to realize the calibration of multiple points of the pressure range of the same pressure instrument. The host computer collects the pressure data in the gas source route and the pressure data of the device under test, and calculates whether the device under test is qualified and the corresponding error.

[0049] In the embodiment of the present invention, the number of electrical proportional valves, the number of front-end buses, and the number of rear-end buses determine that the multi-range automatic test device can simultaneously measure several pressure instruments with different ranges. The number of gas source routes is set according to the calibration requirements. The calibration range of each gas source route can be different from each other, or there can be several gas source routes with the same calibration range. For example, Figure 2 As shown, when the number of electrical proportional valves, the number of front-end bus bars, and the number of rear-end bus bars are all 2, the multi-range automatic test device can simultaneously measure 2 pressure instruments with different ranges. In addition, a gas source route with a range upper limit of 5Kpa, a gas source route with a range upper limit of 70Kpa, a gas source route with a range upper limit of 500Kpa, and multiple gas source routes with a range upper limit of 200Kpa can be set.

[0050] The present invention provides a multi-range automatic testing device, comprising: a host computer, a plurality of electrical proportional valves, a plurality of front-end busbars, a plurality of gas source routes, and a plurality of rear-end busbars, wherein the number of electrical proportional valves is consistent with the number of front-end busbars and the number of rear-end busbars, wherein the first end of each electrical proportional valve is connected to the gas source, and the second end of each electrical proportional valve is connected to the first end of the corresponding front-end busbar; the second end of each front-end busbar is connected to the first end of all gas source routes; the first end of each rear-end busbar is connected to the second end of all gas source routes, and the second end of each rear-end busbar is connected to the device under test; the host computer is connected to all electrical proportional valves, all gas source routes, and all devices under test. By setting a plurality of electrical proportional valves, a plurality of front-end busbars, a plurality of gas source routes, and a plurality of rear-end busbars, a plurality of gas paths are provided for pressure instrument measurement, the air pressure is adjusted by controlling the opening of the electrical proportional valve, and different air pressures are provided for different gas source routes, and several pressure instruments of different ranges can be measured simultaneously, and the calibration of multiple points of the pressure range can be realized synchronously.

[0051] In an optional embodiment, if Figure 1 As shown, each gas source route includes a front-end solenoid valve group, a safety valve, a calibration table, and a rear-end solenoid valve group. The front-end solenoid valve group is connected to the safety valve, the calibration table, and the rear-end solenoid valve group in sequence.

[0052] Specifically, the front solenoid valve group and the rear solenoid valve group are used to control the route in which the gas flows. When the front solenoid valve group and the rear solenoid valve group are connected, the gas flows in this route. The safety valve is used to avoid the risk of overpressure of the gas. The calibration table is used as a standard table and as standard pressure data for comparison with the pressure data of the device under test later.

[0053] In an embodiment of the present invention, the calibration table in each gas source route is set according to the calibration range of the gas source route. The upper computer selects a matching calibration table according to the upper limit of the range of the device under test, and connects the gas source route where it is located. By setting the calibration range that matches the device under test, the calibration accuracy is improved. In addition, the safety level of the safety valve can be determined according to the range of the calibration table, avoiding the problem of increased costs or substandard safety caused by mismatched safety levels.

[0054] In an optional embodiment, if Figure 1 As shown, each front-end solenoid valve group includes a plurality of front-end solenoid valves. The plurality of front-end solenoid valves are connected in parallel, and each front-end solenoid valve is connected to a corresponding front-end bus. Each rear-end solenoid valve group includes a plurality of rear-end solenoid valves. The plurality of rear-end solenoid valves are connected in parallel, and each rear-end solenoid valve is connected to a corresponding rear-end bus.

[0055] Specifically, the number of the electric proportional valve, the front solenoid valve, the front bus, the rear solenoid valve, and the rear bus is the same. Figure 2 As shown, when the number of electrical proportional valves is 2, the number of front-end solenoid valves, front-end bus bars, rear-end solenoid valves, and rear-end bus bars are all 2. At this time, the multi-range automatic test device can calibrate 2 pressure instruments with different ranges at the same time.

[0056] For example, when a 500Kpa pressure meter 1 is connected to the rear-end bus 1, and a 5Kpa pressure meter 2 is connected to the rear-end bus 2, the calibration personnel input the number of devices under test and the upper limit of the measuring range of each device under test on the host computer. The host computer selects the electrical proportional valve 1 and the first gas source route for the pressure meter 1 according to the upper limit of the measuring range of 500Kpa of the pressure meter 1, and according to the connection relationship between the electrical proportional valve, the front-end bus, the front-end solenoid valve, the rear-end solenoid valve, and the rear-end bus, the front-end solenoid valve 1 and the rear-end solenoid valve 1 in the first gas source route are connected, that is, the calibration gas route corresponding to the pressure meter 1 is the electrical proportional valve 1→front-end bus 1→front-end solenoid valve 1→safety valve→calibration table→rear-end solenoid valve 1→rear-end bus 1. Similarly, the host computer selects to connect the electrical proportional valve 2 and the fourth gas source route for the pressure instrument 2 according to the upper range limit of 5Kpa of the pressure instrument 2, and connects the front-end solenoid valve 2 and the rear-end solenoid valve 2 in the fourth gas source route according to the connection relationship among the electrical proportional valve, the front-end bus, the front-end solenoid valve, the rear-end solenoid valve, and the rear-end bus, that is, the calibration gas route corresponding to the pressure instrument 2 is the electrical proportional valve 2→front-end bus 2→front-end solenoid valve 2→safety valve→calibration table→rear-end solenoid valve 2→rear-end bus 2.

[0057] When the 5Kpa pressure gauge 1 is connected to the rear bus 1, and the 500Kpa pressure gauge 2 is connected to the rear bus 2. The upper computer selects the electrical proportional valve 2 and the fourth gas source route for the pressure gauge 1 according to the upper limit of the range of 5Kpa, and according to the connection relationship of the electrical proportional valve, the front bus, the front solenoid valve, the rear solenoid valve, and the rear bus, the front solenoid valve 2 and the rear solenoid valve 1 in the fourth gas source route are connected, that is, the calibration gas route corresponding to the pressure gauge 1 is the electrical proportional valve 2 → front bus 2 → front solenoid valve 2 → safety valve → calibration table → rear solenoid valve 1 → rear bus 1. Similarly, the host computer selects to connect the electrical proportional valve 1 and the first gas source route for pressure instrument 2 according to the upper range limit of 500Kpa of pressure instrument 2, and connects the front-end solenoid valve 1 and the rear-end solenoid valve 2 in the fourth gas source route according to the connection relationship among the electrical proportional valve, the front-end bus, the front-end solenoid valve, the rear-end solenoid valve, and the rear-end bus. That is, the calibration gas route corresponding to pressure instrument 2 is electrical proportional valve 1→front-end bus 1→front-end solenoid valve 1→safety valve→calibration table→rear-end solenoid valve 2→rear-end bus 2.

[0058] For example, when the 500Kpa pressure gauge 1 and the 500Kpa pressure gauge 2 are connected to the rear-end bus 1 and the rear-end bus 2 respectively, the upper computer selects the electrical proportional valve 1 and the first gas source route for the pressure gauge 1 according to the upper limit of the range of the pressure gauge 1, 500Kpa, and according to the connection relationship among the electrical proportional valve, the front-end bus, the front-end solenoid valve, the rear-end solenoid valve, and the rear-end bus, the front-end solenoid valve 1 and the rear-end solenoid valve 1 in the first gas source route are connected, that is, the calibration gas route corresponding to the pressure gauge 1 is the electrical proportional valve 1→front-end bus 1→front-end solenoid valve 1→safety valve→calibration table→rear-end solenoid valve 1→rear-end bus 1. Similarly, the host computer selects the electrical proportional valve 1 and the first gas source route for pressure instrument 2 according to the upper range limit of 500Kpa of pressure instrument 2, and connects the front-end solenoid valve 2 and the rear-end solenoid valve 2 in the first gas source route according to the connection relationship among the electrical proportional valve, the front-end bus, the front-end solenoid valve, the rear-end solenoid valve, and the rear-end bus, that is, the calibration gas route corresponding to pressure instrument 2 is electrical proportional valve 1→front-end bus 1→front-end solenoid valve 2→safety valve→calibration table→rear-end solenoid valve 2→rear-end bus 2.

[0059] In an optional implementation manner, each back-end bus is connected to a plurality of devices under test.

[0060] Specifically, each back-end bus is provided with multiple ports, each port can be connected to a device under test. The devices under test connected to the same back-end bus have the same measuring range. The device under test can be a temperature and pressure recorder.

[0061] In an optional embodiment, if Figure 3 As shown, the multi-range automatic test device also includes: a test device lower computer, an electrical proportional valve driving device, a calibration table acquisition device and an electromagnetic valve driving device. Among them, the first end of the test device lower computer is connected to the upper computer, and the second end of the test device lower computer is respectively connected to the electrical proportional valve driving device, the calibration table acquisition device and the electromagnetic valve driving device.

[0062] Specifically, the lower computer of the test device receives the instruction of the upper computer, and sends the instruction to the electric proportional valve driving device, the calibration table acquisition device, and the solenoid valve driving device. The electric proportional valve driving device drives the corresponding electric proportional valve to act according to the instruction. The solenoid valve driving device drives the corresponding front-end solenoid valve and the rear-end solenoid valve to act according to the instruction. The calibration table acquisition device collects the pressure data of the corresponding calibration table according to the instruction, and uploads the pressure data to the upper computer. In an embodiment of the present invention, the air pressure is adjusted by controlling the opening of the electric proportional valve, thereby realizing the full-scale pressure detection of the temperature and pressure recorder. After the calibration is completed, the pressure instrument is calibrated by the upper computer, and the pressure gauge difference at which point in the process from 0 to the upper limit of the range can be accurately analyzed for accurate compensation.

[0063] In an optional embodiment, if Figure 3 As shown, the multi-range automatic test device also includes: a lower computer of the device under test and a collection device of the device under test. The first end of the lower computer of the device under test is connected to the upper computer, and the second end of the lower computer of the device under test is connected to the collection device of the device under test.

[0064] Specifically, the lower computer of the device under test receives the instruction of the upper computer and sends the instruction to the acquisition device of the device under test. The acquisition device of the device under test collects the pressure data of the corresponding device under test according to the instruction and uploads the pressure data to the upper computer.

[0065] In an optional embodiment, the multi-range automatic test device further comprises: an air compressor and a gas filter, wherein a first end of the gas filter is connected to the air compressor, and a second end of the gas filter is connected to the first ends of all the electrical proportional valves.

[0066] Specifically, the air source is output through an air compressor, then passes through a gas filter to purify air impurities and humidity, and is input into the electric proportional valve after filtration.

[0067] The present invention provides an application method of a multi-range automatic testing device, such as Figure 4 As shown, the following steps are included:

[0068] S11, selecting the electrical proportional valve and the air source route that need to be turned on according to the number of devices under test and the upper limit of the measuring range of each device under test.

[0069] S12, sending a conduction instruction to the electrical proportional valve and the gas source route that need to be conducted.

[0070] S13, collecting pressure data in the gas source route and pressure data of the device under test, and calculating the error of the device under test.

[0071] Specifically, during the calibration, the calibration personnel input the number of devices under test and the upper limit of the range of each device under test on the host computer. The host computer selects the electrical proportional valves and gas source routes that need to be turned on according to the number of devices under test and the upper limit of the range of each device under test, and sends a turn-on instruction to them, and sends a closing instruction to the electrical proportional valves and gas source routes that do not need to be turned on, thereby opening the test line. Then the multi-range automatic test device starts to perform the calibration work, controls the pressure equipment to start pressure, and adjusts the air pressure in different gas source routes by controlling the opening ratio of different electrical proportional valves, so as to achieve the purpose of calibrating pressure instruments of different ranges at the same time. At the same time, for the same electrical proportional valve, the air pressure is adjusted by controlling the opening ratio of the electrical proportional valve, so as to realize the calibration of multiple points of the pressure range of the same pressure instrument. The host computer collects the pressure data in the gas source route and the pressure data of the device under test, and calculates whether the device under test is qualified and the corresponding error.

[0072] The present invention provides an application method of a multi-range automatic test device, including: selecting the electrical proportional valves and gas source routes that need to be turned on according to the number of devices under test and the upper limit of the range of each device under test; sending a turn-on instruction to the electrical proportional valves and gas source routes that need to be turned on; collecting pressure data in the gas source routes and pressure data of the devices under test, and calculating the error of the devices under test. The air pressure is adjusted by controlling the opening of the electrical proportional valve, providing different air pressures for different gas source routes, and measuring several pressure instruments with different ranges at the same time, and the calibration of multiple points of the pressure range can be realized synchronously.

[0073] In an optional embodiment, the application method further comprises the following steps:

[0074] S14, performing pressure compensation on the device under test according to the pressure data in the gas source route and the pressure data of the device under test.

[0075] Specifically, after the calibration is completed, the pressure instrument is calibrated through the host computer, which can accurately analyze the pressure gauge difference at which point in the process from 0 to the upper limit of the range and perform precise compensation.

[0076] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A multi-range automatic testing device, characterized in that: The multi-range automatic test device comprises: a host computer, a plurality of electrical proportional valves, a plurality of front-end buses, a plurality of gas source routes, and a plurality of rear-end buses. The number of the electrical proportional valves is consistent with the number of the front-end buses and the number of the rear-end buses. The first end of each of the electrical proportional valves is connected to the gas source, and the second end of each of the electrical proportional valves is connected to the first end of the corresponding front-end bus; The second end of each of the front-end bus bars is connected to the first ends of all gas source routes; The first end of each rear-end bus is connected to the second ends of all gas source routes, and the second end of each rear-end bus is connected to the device under test; The host computer is connected to all electrical proportional valves, all gas source routes, and all devices under test; During the calibration, the host computer selects the electrical proportional valve and the gas source route that need to be turned on according to the number of devices under test and the upper limit of the measuring range of each device under test, and sends a turn-on instruction to them; the host computer collects the pressure data in the gas source route and the pressure data of the device under test, and calculates the error of the device under test.

2. The multi-range automatic testing device according to claim 1, characterized in that: Each of the gas source routes includes a front-end solenoid valve group, a safety valve, a calibration table and a rear-end solenoid valve group, wherein: The front-end solenoid valve group is connected to the safety valve, the calibration table, and the rear-end solenoid valve group in sequence.

3. The multi-range automatic testing device according to claim 2, characterized in that: Each of the front-end solenoid valve groups includes a plurality of front-end solenoid valves, wherein: The plurality of front-end solenoid valves are connected in parallel, and each of the front-end solenoid valves is correspondingly connected to a front-end bus.

4. The multi-range automatic testing device according to claim 3, characterized in that: Each of the rear end solenoid valve groups includes a plurality of rear end solenoid valves, wherein: A plurality of rear end solenoid valves are connected in parallel, and each of the rear end solenoid valves is correspondingly connected to a rear end bus.

5. The multi-range automatic testing device according to claim 4, characterized in that: Each back-end bus is connected to multiple devices under test.

6. The multi-range automatic testing device according to claim 2, characterized in that: The multi-range automatic test device also includes: a test device lower computer, an electrical proportional valve drive device, a calibration table acquisition device and a solenoid valve drive device, wherein: The first end of the lower computer of the test device is connected to the upper computer, and the second end of the lower computer of the test device is respectively connected to the electric proportional valve driving device, the calibration table acquisition device and the solenoid valve driving device; The lower computer of the testing device receives the instruction of the upper computer, and sends the instruction to the electric proportional valve driving device, the calibration table acquisition device, and the solenoid valve driving device; The electrical proportional valve driving device drives the corresponding electrical proportional valve to operate according to the instruction; The solenoid valve driving device drives the corresponding front-end solenoid valve and rear-end solenoid valve to operate according to the instruction; The calibration table acquisition device acquires pressure data of the corresponding calibration table according to the instruction, and uploads the pressure data to the host computer.

7. The multi-range automatic testing device according to claim 2, characterized in that: The multi-range automatic test device also includes: a lower computer of the device under test and a collection device of the device under test, wherein: The first end of the lower computer of the device under test is connected to the upper computer, and the second end of the lower computer of the device under test is connected to the acquisition device of the device under test; The lower computer of the device under test receives the instruction of the upper computer and sends the instruction to the acquisition device of the device under test; The measured device acquisition device acquires pressure data of the corresponding measured device according to the instruction, and uploads the pressure data to the host computer.

8. The multi-range automatic testing device according to claim 4, characterized in that: The multi-range automatic testing device also includes: an air compressor and a gas filter, wherein: The first end of the gas filter is connected to the air compressor, and the second end of the gas filter is connected to the first ends of all the electrical proportional valves.

9. An application method of a multi-range automatic testing device, characterized in that: The application method comprises: The electrical proportional valve and gas source route that need to be turned on are selected according to the number of devices under test and the upper limit of the measuring range of each device under test; Sending a conduction instruction to the electrical proportional valve and the gas source route that need to be conducted; Collect the pressure data in the gas source route and the pressure data of the device under test, and calculate the error of the device under test.

10. The application method of the multi-range automatic testing device according to claim 9, characterized in that: The application method further comprises: According to the pressure data in the gas source route and the pressure data of the device under test, pressure compensation is performed on the device under test.

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