Automatic detection system for pressure instrument temperature influence test

Abstract

The invention relates to an automatic detection system for a pressure instrument temperature influence test. The device comprises a high-low temperature test cabinet body, a heat preservation chamber is arranged in the high-low temperature test cabinet body, a heat preservation layer is arranged on the outer wall of the heat preservation chamber, and a detected pressure gauge is placed in the heat preservation chamber; the refrigerating unit is used for cooling the heat preservation chamber; the hot air generator is used for heating the heat preservation chamber; the pressure generator is communicated with the detected pressure gauge through a medium pipeline; the standard digital pressure gauge is connected with the detected pressure gauge, and the medium pressure generated by the pressure generator can be transmitted to the detected pressure gauge and the standard digital pressure gauge at the same time; the visual device comprises cameras configured corresponding to the detected pressure gauges, and the cameras are used for shooting pictures of the detected pressure gauges at the detection points; the control system is electrically connected with the refrigerating unit, the hot air generator, the pressure generator, the camera and the standard digital pressure gauge. Full automation of operation and full digitalization of testing are achieved, working efficiency is greatly improved, and testing data traceability is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure instrument type evaluation, in particular to an automatic detection system for a pressure instrument temperature influence test. Background Art

[0002] The type evaluation of pressure instruments (hereinafter referred to as type evaluation) is a type test for new products produced by trial production. It requires multiple samples of one or more types of pressure instruments to be tested for performance and stability. The purpose is to verify whether the product can meet all the requirements of the technical specifications. Only new products that pass the type test can be put into formal production and put on the market. The type evaluation needs to be entrusted to a qualified metrology and verification agency to complete and issue a certificate.

[0003] The object of type evaluation is called sample (pressure gauge under test), and temperature effect test is an indispensable test item in type evaluation. Temperature effect test includes two performance tests: low temperature performance test and high temperature performance test. The former requires that the sample be kept warm for a specified time (generally 3 hours) under the conditions of -40°C ambient temperature and medium temperature, and then the sample's indication accuracy is tested (or called: indication test) according to the "regulations", that is, the sample pressure is first raised to the pressure of each calibration point, tapped, read, and the tapping displacement is obtained, and then the pressure is maintained for 3 minutes, and then the pressure is reduced to the pressure of each calibration point, tapped, read, and the tapping displacement is obtained, and the return error is calculated. The calibration point pressure is generally the pressure of each large scale line on the pressure gauge under test; the latter is to complete the same testing process under the conditions of 70°C ambient temperature and medium temperature.

[0004] According to the requirements of the "Regulations" and "Type Evaluation Outline", when the temperature reaches -40°C or 70°C, the sample pressure must be pre-pressurized to 75% of its range, and then kept warm for a specified time (usually 3 hours). After the insulation time is over, the indication test is performed. When performing indication test, the temperature of the instrument under test and the medium must be maintained at -40°C and 70°C.

[0005] Most of the existing devices put the pressure gauge under test into the high and low temperature test cabinet, cool it down to -40°C, keep it warm for a specified time (usually 3 hours), then take out the gauge under test and do the indication test at room temperature. Then, put the gauge under test back into the high and low temperature test cabinet, heat it up to 70°C, keep it warm for a specified time, and then do the indication test at room temperature. There are also a few devices that are connected to the high and low temperature cabinets. However, since the pressure is pressed, the pressure is maintained during 3 hours, and the indication test needs to be done manually and read manually, not only does it require continuous adjustment of the pressure device to control the pressure within the error range, but also the inspector needs to read the indication of multiple (usually 3) gauges under test through the observation window during the indication test. There are many disadvantages, such as high labor intensity, low efficiency, data accuracy cannot be guaranteed, and the test data cannot be traced. In addition, the indication test under room temperature conditions is inconsistent with the requirements of the "Regulations" and needs to be improved and perfected urgently.

[0006] Therefore, it is very necessary to provide a fully automatic detection system that fully complies with the requirements of the "Regulations" for the temperature influence test of the pressure instrument type evaluation. Summary of the invention

[0007] To this end, the present invention provides an automatic detection system for temperature influence test of pressure instrument, which not only makes the temperature influence test of pressure instrument type evaluation fully consistent with the requirements of "regulations", but also realizes full automation of operation and full digitization of test, greatly improves work efficiency and realizes test data traceability.

[0008] In order to solve the above technical problems, the present invention provides a pressure instrument temperature influence test automatic detection system, comprising: A high and low temperature test cabinet, wherein an insulation chamber is provided inside the cabinet, an insulation layer is provided on the outer wall of the insulation chamber, and the interior of the insulation chamber is used to place the pressure gauge to be tested; A refrigeration unit, including an evaporator copper tube arranged in the insulation layer, for achieving cooling of the insulation chamber; A hot air generator is connected to the insulation chamber through a pipeline and delivers hot air to the interior of the insulation chamber to increase the temperature of the insulation chamber; A pressure generator, connected to the pressure gauge to be tested through a medium pipeline, so as to transmit the generated pressure to the pressure gauge to be tested; A standard digital pressure gauge connected to the pressure gauge to be tested, wherein the medium pressure generated by the pressure generator can be transmitted to the pressure gauge to be tested and the standard digital pressure gauge at the same time; A visual device, comprising a camera configured corresponding to each of the pressure gauges to be inspected, the camera being used to take photos of the pressure gauges to be inspected at various inspection points; A control system is electrically connected to the refrigeration unit, the hot air generator, the pressure generator, the camera and the standard digital pressure gauge respectively.

[0009] In one embodiment of the present invention, a sample mounting seat is further provided at the bottom of the insulation chamber, a mounting base is installed on the sample mounting seat, a threaded joint for mounting the pressure gauge to be tested is arranged on the mounting base, and the threaded joint is connected to the medium pipeline.

[0010] In one embodiment of the present invention, the insulation chamber comprises an insulation chamber door, and the insulation chamber door is provided with an observation window.

[0011] In one embodiment of the present invention, the observation window includes at least one layer of transparent heat-insulating glass with heating function.

[0012] In one embodiment of the present invention, a camera cabinet is installed outside the observation window, each camera is installed on a camera installation base plate of the camera cabinet, and each pressure gauge to be inspected is matched with one camera.

[0013] In one embodiment of the present invention, a lighting lamp for illuminating the pressure gauge under inspection is also provided on the top of the insulation chamber.

[0014] In one embodiment of the present invention, a pressure generator cabinet for accommodating the pressure generator is installed outside the insulation chamber, a plurality of pressure gauges to be tested are provided, and the medium pipeline includes a main pipeline connected to the pressure generator and branch pipelines connected to the main pipeline and connected to each of the pressure gauges to be tested.

[0015] In one embodiment of the present invention, the control system includes an electrically connected host computer and a controller, the pressure generator is connected to the controller via a cable, and the camera is connected to the host computer via a data cable of the camera.

[0016] In one embodiment of the present invention, the controller is a PLC or a single chip microcomputer.

[0017] The above technical solution of the present invention has the following advantages compared with the prior art: The automatic detection system for temperature influence test of pressure instrument described in the present invention controls the whole test process, including temperature regulation, pressure generation and maintenance, data acquisition and processing, by automatic control. No human intervention is required in the whole detection process, which greatly reduces labor intensity and significantly improves work efficiency.

[0018] The present invention not only enables the temperature influence test of the pressure instrument type evaluation to be completely consistent with the requirements of the "regulations", but also realizes full automation of operation and full digitization of testing, greatly improves work efficiency, and realizes test data traceability.

[0019] The present invention can realize the simultaneous testing of multiple samples. Each sample is equipped with an independent camera and a mounting seat, which can simultaneously meet the testing requirements of pressure instruments of different models and improve the utilization efficiency of the testing equipment.

[0020] The present invention can quickly adjust and accurately maintain the temperature of the insulation chamber by the cooperation of the refrigeration unit and the hot air generator; the pressure generator is calibrated by a standard digital pressure gauge to ensure that the pressure provided to the sample meets the accuracy requirements.

[0021] The present invention is equipped with a transparent heat-insulating glass observation window with heating function, which can not only maintain the airtightness of the insulation chamber, but also facilitate the observation of the internal instrument status; the addition of the lighting lamp further optimizes the shooting effect of the visual device and ensures the clarity of data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0023] Figure 1 It is a front view of the automatic detection system for temperature influence test of pressure instrument of the present invention.

[0024] Figure 2 It is a top view of the automatic detection system for temperature influence test of pressure instrument of the present invention.

[0025] Figure 3 It is a side view of the automatic detection system for temperature influence test of pressure instrument of the present invention.

[0026] Description of the Figures in the Specification: 1. Camera; 2. Camera mounting base; 3. Insulation chamber; 4. Mounting base; 5. Evaporator copper tube; 6. Insulation layer; 7. High and low temperature test cabinet; 8. Standard digital pressure gauge; 9. Host computer; 10. Electrical auxiliary cabinet; 11. Pressure generator; 12. Pressure generator cabinet; 13. Medium pipeline; 14. Lighting; 15. Insulation chamber door; 16. Observation window; 17. Insulating glass; 18. Camera cabinet; 20. Threaded joint; 21. Sample mounting seat; 22. Hot air generator; 23. Refrigeration unit; 24. Controller; 25. Camera data cable; 26. Pressure gauge under test; 27. Controller cable. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0029] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0031] Reference Figures 1 to 3 As shown, a pressure instrument temperature influence test automatic detection system of the present invention comprises: A high and low temperature test cabinet 7, in which an insulation chamber 3 is arranged, and an insulation layer 6 is arranged on the outer wall of the insulation chamber 3, and the interior of the insulation chamber 3 is used to place a pressure gauge 26 to be tested; A refrigeration unit 23, comprising an evaporator copper tube 5 arranged in the insulation layer 6, for achieving cooling of the insulation chamber 3; The hot air generator 22 is connected to the insulation chamber 3 through a pipeline, and delivers hot air to the insulation chamber 3 to form a hot air circulation to achieve the temperature increase of the insulation chamber 3; The pressure generator 11 is connected to the pressure gauge 26 to be tested through the medium pipeline 13 to transmit the generated pressure to the pressure gauge 26 to be tested; A standard digital pressure gauge 8 (standard device) is connected to the pressure gauge 26 to be tested, and the medium pressure generated by the pressure generator 11 can be transmitted to the pressure gauge 26 to be tested and the standard digital pressure gauge 8 at the same time; A visual device, including a camera 1 (industrial camera) configured corresponding to each of the pressure gauges 26 to be inspected, wherein the camera 1 is used to take photos of the pressure gauges 26 to be inspected at various inspection points; The control system is electrically connected to the refrigeration unit 23, the hot air generator 22, the pressure generator 11, the camera 1 and the standard digital pressure gauge 8 respectively.

[0032] In one embodiment, a sample mounting seat 21 is further provided at the bottom of the insulation chamber 3, a mounting base plate 4 is mounted on the sample mounting seat 21, a threaded joint 20 for mounting the pressure gauge 26 to be inspected is arranged on the mounting base plate 4, and the threaded joint 20 is connected to the medium pipeline 13. The sample mounting seat 21 provides a stable support structure, and the threaded joint 20 can be combined with the pressure gauge 26 to be inspected to be installed and removed conveniently and quickly, which reduces the operation time and improves the equipment utilization rate. The connectivity between the mounting seat and the medium pipeline 13 ensures the high efficiency of pressure transmission.

[0033] It should be noted that the threaded joint 20 on the mounting base plate 4 is connected to the pressure generator 11 and the standard digital pressure gauge 8 through the medium pipeline 13, so that the medium pressure generated by the pressure generator 11 can be transmitted to the sample and the standard digital pressure gauge 8 at the same time. The outer wall of the insulation chamber 3 is paved with an evaporator copper tube 5, which is cooled by the refrigeration unit 23; at the same time, the hot air generator 22 can form a hot air circulation through the pipeline connected to the insulation chamber 3, thereby heating it; the insulation chamber 3 and the cabinet door are both provided with an insulation layer 6, so that the insulation chamber 3 and the sample can be cooled to -40°C and heated to 70°C. The insulation chamber 3 inside the high and low temperature test cabinet 7 adopts the insulation layer 6 design, which can effectively reduce temperature loss and provide a uniform and stable temperature environment, thereby ensuring that the pressure gauge 26 under test is tested within the set temperature range (-40°C to 70°C). The design of the insulation layer 6 also improves energy utilization efficiency and reduces equipment operating costs. The refrigeration unit 23 realizes rapid cooling of the insulation chamber 3 through the evaporator copper tube 5, and can accurately control the low temperature environment. Compared with the traditional refrigeration method, the evaporator copper tube 5 is arranged in the insulation layer 6, which has the characteristics of high heat exchange efficiency and uniform refrigeration, ensuring the stability and accuracy of temperature control. The hot air generator 22 transports the hot air to the inside of the insulation chamber 3 through the pipeline, and forms a hot air circulation, which can quickly heat up and keep the temperature stable. Compared with the traditional heating method, this design avoids the problem of local overheating, improves the temperature uniformity of the pressure gauge 26 to be tested, and meets the requirements of high temperature testing. The pressure generator 11 transmits the detection pressure to the pressure gauge 26 to be tested and the standard digital pressure gauge 8 (standard instrument) through the medium pipeline 13 at the same time, realizing the synchronous transmission of pressure. This design ensures the accuracy and consistency of the pressure test and effectively avoids the loss in the pressure transmission process. The standard instrument provides a high-precision pressure reference value for calibrating the medium pressure generated by the pressure generator 11 to ensure that the detection pressure meets the requirements of the regulations, which provides a guarantee for the reliability and accuracy of the test data. Each pressure gauge 26 to be inspected is equipped with an independent camera 1 for taking photos of each inspection point. The introduction of the visual device makes the reading of the indication automatic, reduces manual operation errors, and improves the efficiency and accuracy of data collection. The photos taken by the camera 1 can also be associated with the inspection data to achieve data traceability and reviewability.

[0034] After the test starts, the inner cavity of the insulation chamber 3 is cooled or heated by controlling the refrigeration unit 23 and the hot air generator 22. When the temperature reaches a certain level, insulation begins, and the pressure generator 11 is started at the same time to make the medium pressure reach the required pressure (pre-pressurization pressure) and maintain the pressure. When the insulation time is up, the indication of the pressure gauge 26 under test is tested. During the indication test, the control system controls the pressure generator 11 to output the required pressure to the gauge under test, and controls the camera 1 to take photos of the pressure gauge 26 under test at each test point, and uses machine vision methods to parse the indication of the gauge under test, and associates the data with the photos and automatically saves them.

[0035] In one embodiment, the insulation chamber 3 includes an insulation chamber door 15, and an observation window 16 is provided on the insulation chamber door 15. The observation window 16 includes at least one layer of transparent heat-insulating glass 17 with a heating function. The transparent heat-insulating glass 17 with a heating function can not only prevent the glass from frosting or fogging to affect observation, but also play a heat-insulating role. The design of the observation window 16 facilitates real-time viewing of the equipment operation status and improves the convenience of operation. The camera 1 configured in front of the observation window 16 can take pictures of the sample through the glass.

[0036] In one embodiment, a camera cabinet 18 is installed outside the observation window 16, and each camera 1 is installed on the camera mounting base plate 2 of the camera cabinet 18, and each pressure gauge 26 to be inspected matches one camera 1. A lighting lamp 14 for illuminating the pressure gauge 26 to be inspected is also provided on the top of the insulation chamber 3. The lighting lamp 14 provides the brightness environment required for taking pictures. The camera cabinet 18 provides a stable installation platform for the camera 1, while preventing external interference from affecting the shooting effect. The lighting lamp 14 optimizes the shooting environment, ensures the clarity of the image taken under different conditions, and provides support for data collection of the visual device.

[0037] In one embodiment, a pressure generator cabinet 12 for accommodating the pressure generator 11 is installed outside the insulation chamber 3, a plurality of pressure gauges 26 to be tested are provided, and the medium pipeline 13 includes a main pipeline connected to the pressure generator 11 and branch pipelines connected to the main pipeline and connected to each of the pressure gauges 26 to be tested.

[0038] In one embodiment, the control system is arranged on an electrical auxiliary cabinet 10, and includes an electrically connected host computer 9 and a controller 24, the controller 24 is connected to the host computer 9 via a controller cable 27, the pressure generator 11 is connected to the controller 24 via a cable, and the camera 1 is connected to the host computer 9 via a data cable of the camera 1.

[0039] The camera 1 is controlled by the host computer 9 to take photos, and the photos are saved in the designated location of the host computer 9. The host computer 9 sends a control instruction to the controller 24, and the controller 24 receives the instruction and controls the pressure generator 11 to increase, maintain or reduce the pressure. The controller 24 is a PLC or a single chip microcomputer.

[0040] It should be noted that the host computer 9 controls the camera 1 to take photos of samples at each instant of the calibration point during the indication detection process, and then uses machine vision technology to analyze the photos and obtain the pointer indication (test data) of the samples in the photos; the photos are simultaneously saved by the host computer 9 and associated with the test data, so that each data has a corresponding photo of the acquired data for review and comparison, thereby realizing the traceability of the test data.

[0041] For example, the host computer 9 controls the camera 1 according to a preset program to take photos of each inspection point of each pressure gauge 26 during the indication detection process. The timing of taking photos is precisely controlled by the host computer 9 to ensure that the photos are taken after the pressure reaches a stable state, so as to capture the real indication state.

[0042] The photographed photo is transmitted to the host computer 9 via a data line; the host computer 9 uses machine vision technology to analyze the photo, which mainly includes the following steps: Image preprocessing: filter noise, adjust brightness and enhance edges of photos to improve image clarity.

[0043] Feature recognition: Locate the dial area of ​​the pressure gauge and detect the scale lines, number markings and pointer.

[0044] Pointer position analysis: Calculate the pointer position through the angle, correspond it with the dial scale, and get the actual indication.

[0045] Data verification: Compare the analysis results with the preset calibration point values ​​to ensure the accuracy of the indication analysis.

[0046] Association and storage of indication data and photos: the upper computer 9 associates and stores the parsed indication data with the corresponding photos.

[0047] The indicated data and photos are stored one by one to form a complete test record, which is convenient for subsequent traceability and review.

[0048] Traceability of test data: When it is necessary to verify the test data, the user can retrieve the corresponding photos and analysis records through the host computer 9 software.

[0049] Photos serve as an intuitive basis for data and can be manually reviewed to ensure the reliability and authenticity of the data.

[0050] It should be noted that the pressure gauge 26 to be tested is installed on the sample mounting seat 21 to ensure reliable fixation and appropriate angle. The focal length, shooting angle and lighting conditions of the camera 1 are adjusted to make the dial clearly visible. The pressure value of the calibration point, the shooting time, the camera 1 parameters (such as shutter speed, resolution) and the saving path are set in the host computer 9. The calibration point is usually a plurality of key pressure points within the range of the pressure gauge 26 to be tested, such as 0%, 25%, 50%, and 75% of the range. After starting the test program, the system automatically increases, maintains and reduces the pressure in a preset order. When the pressure reaches each calibration point and stabilizes, the host computer 9 sends an instruction to trigger the camera 1 to take a photo. The photographed photos are transmitted to the host computer 9 in real time. The host computer 9 runs a machine vision algorithm to analyze the pressure representation value on the photo and save the analysis results as data records. The analysis data and corresponding photos of each calibration point are automatically saved in the database. The association between data and photos is achieved through a unified number or timestamp mark. The user can retrieve the test record of any calibration point through the host computer 9 software. The photo directly displays the actual indication status of the pressure gauge 26 under inspection, which is convenient for comparison with the analytical data.

[0051] For example, after the pressure value at each calibration point stabilizes, the system controls the camera to take photos of the pressure gauge being tested. Each photo contains the pressure gauge dial and its pointer position. The photo file naming rules include information such as the test time, pressure calibration point, tapping status (front or back), etc. All photo files are saved in directories according to the sample number. The file name of each photo is mapped to the corresponding test point indication data and saved in the system database. In the query interface, the test data can be quickly located by sample number, test time or pressure point. Click the indication data to synchronously call out the corresponding photo, showing the pointer position and scale lines on the photo.

[0052] In addition, the system automatically marks the detection points that exceed the error range and prompts the user to check. During the photo review process, the user can calibrate the displayed value. After the correction, the system automatically records the modification operation and time, and retains the original data and photos.

[0053] Specifically, each photo file is parsed through the visual processing process of the host computer 9 to obtain the indicated value of the sample pointer, and the indicated value data is displayed at a specific position on the test page through the program of the host computer 9. For example, the specific process is as follows: The visual device takes a picture of the inspected pressure gauge 26 in a zero-pressure state and saves the picture.

[0054] The software processes the photo: locates the dial, cuts out the part outside the dial, performs grayscale processing (divides the grayscale value of the photo into 0-255 levels according to the logarithmic relationship), removes noise by filtering, and binarizes the image to make the photo appear clear in black and white. Find the pointer in the processed photo and mark the first center line of the pointer.

[0055] First calibration point detection: Add pressure to the pressure gauge 26 to be tested. When the pressure reaches the corresponding pressure value of the first calibration point, stop adding pressure and keep the pressure stable for a while so as to take a photo. Take a photo of the gauge to be tested at this time and save it. Process the photo and mark the second center line of the pointer.

[0056] A coordinate system is established with the intersection of the first center line and the second center line as the origin; the scale area in the photo is identified and the scale lines are calibrated; and the pressure value pointed to by the pointer is calculated based on the angle between the scale lines and the center line.

[0057] Continue to pressurize the meter under test until it reaches each preset pressure value, and repeat the following steps: Take a photo of the meter under test at each pressure point; process the photo, mark the center line of the pointer, and calculate the pressure value of the pointer through the coordinate system; compare the calculated pressure value (P1) with the applied system pressure value (P2) and the pressure value manually read on the photo (P3); if the error of the pressure point is within the allowable range, continue to test the next pressure point; if the error exceeds the allowable range, it is judged that the meter under test does not meet the accuracy standard; Recording and display of test results: After the test is completed at the last preset pressure point, if the errors of all points are within the allowable range, the accuracy of the meter under test is judged to be up to standard; otherwise, the accuracy is judged to be not up to standard.

[0058] During the test, all indications (P1) are displayed in real time on the computer screen; click on any indication to view the corresponding real-time photo. If there is a deviation between P1 and P3, it can be manually modified and the modification record is kept. During the test, multiple tables under test can be tested at the same time to improve the test efficiency. Each table under test is photographed by an independent camera 1, and the data is recorded and processed separately.

[0059] The specific operation process of the system is as follows: install the sample (pressure instrument to be tested) in a heat preservation chamber 3 that can reach both low temperature (-40°C) and high temperature (70°C), and close the cabinet door. Start the equipment, and start cooling (or heating) at this time; when the temperature reaches the requirement (low temperature test is -40°, high temperature is 70°C), the pressure generator 11 automatically starts to pre-boost, and during the boosting process, the required medium pressure is provided to the pressure instrument to be tested, and then the system automatically reads and saves the indication of the pressure instrument to be tested using machine vision technology. The detection processes such as temperature increase (decrease), detection medium pressure increase (decrease) and pressure maintenance, machine vision meter reading, and test data storage are all controlled by the host computer 9, thereby realizing a fully automatic detection method for temperature influence test on pressure instruments. The glass observation window 16 on the front side (door) of the insulation chamber 3 is installed with multi-layer glass with heating and anti-fogging, which can not only keep heat and insulate, but also enable the industrial camera 1 to take pictures of the pressure gauge 26 under test; the medium pipeline 13 of the pressure generator 11 is connected to the joint of the gauge under test and generates the pressure required for the test. The upper computer 9 controls the refrigeration unit 23 and the hot air generator 22 to cool down or heat up the insulation cavity by sending instructions to the controller 24. When the temperature is reached, insulation begins, and the pressure generator 11 is started at the same time to make the medium pressure reach the required pressure (pre-pressurization pressure) and maintain the pressure; when the insulation time is up, it automatically enters the indication detection program to complete the indication detection of the pressure gauge 26 under test; during the indication detection, the upper computer 9 not only controls the pressure generator 11 to output the required pressure to the gauge under test through the controller 24 (PLC or single-chip microcomputer), but also controls the camera 1 to take photos of the gauge under test 26 at each calibration point, and uses machine vision methods to parse the indication of the gauge under test, associates the data with the photos and automatically saves them, thereby realizing the traceability of the test data.

[0060] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An automatic detection system for temperature influence test of pressure instrument, characterized in that: include: A high and low temperature test cabinet (7) is provided with an insulation chamber (3) therein, the outer wall of the insulation chamber (3) is provided with an insulation layer (6), and the interior of the insulation chamber (3) is used to place a pressure gauge (26) to be tested; A refrigeration unit (23), comprising an evaporator copper tube (5) arranged in the insulation layer (6), and used to achieve cooling of the insulation chamber (3); A hot air generator (22) is connected to the heat preservation chamber (3) through a pipeline, and delivers hot air to the interior of the heat preservation chamber (3) to increase the temperature of the heat preservation chamber (3); A pressure generator (11) is connected to the pressure gauge (26) to be tested via a medium pipeline (13) so as to transmit the generated pressure to the pressure gauge (26) to be tested; A standard digital pressure gauge (8) connected to the pressure gauge (26) to be tested, wherein the medium pressure generated by the pressure generator (11) can be transmitted to the pressure gauge (26) to be tested and the standard digital pressure gauge (8) at the same time; A visual device, comprising a camera (1) configured corresponding to each of the pressure gauges (26) to be inspected, wherein the camera (1) is used to take photos of the pressure gauge (26) to be inspected at each inspection point; A control system is electrically connected to the refrigeration unit (23), the hot air generator (22), the pressure generator (11), the camera (1) and the standard digital pressure gauge (8), respectively.

2. According to claim 1, a pressure instrument temperature influence test automatic detection system is characterized in that: A sample mounting seat (21) is also provided at the bottom of the insulation chamber (3), a mounting base plate (4) is mounted on the sample mounting seat (21), a threaded joint (20) for mounting the pressure gauge (26) to be tested is arranged on the mounting base plate (4), and the threaded joint (20) is connected to the medium pipeline (13).

3. The automatic detection system for temperature influence test of pressure instrument according to claim 1 is characterized in that: The insulation chamber (3) comprises an insulation chamber door (15), and an observation window (16) is provided on the insulation chamber door (15).

4. The automatic detection system for temperature influence test of pressure instrument according to claim 3 is characterized in that: The observation window (16) comprises at least one layer of transparent heat-insulating glass (17) with a heating function.

5. The automatic detection system for temperature influence test of pressure instrument according to claim 3 is characterized in that: A camera cabinet (18) is installed outside the observation window (16), each of the cameras (1) is installed on a camera installation base plate (2) of the camera cabinet (18), and each of the pressure gauges (26) to be inspected is matched with one of the cameras (1).

6. The automatic detection system for temperature influence test of pressure instrument according to claim 1 is characterized in that: The top of the insulation chamber (3) is also provided with a lighting lamp (14) for illuminating the pressure gauge (26) to be tested.

7. The automatic detection system for temperature influence test of pressure instrument according to claim 1 is characterized in that: A pressure generator cabinet (12) for accommodating the pressure generator (11) is installed outside the insulation chamber (3), a plurality of pressure gauges (26) to be tested are provided, and the medium pipeline (13) comprises a main pipeline connected to the pressure generator (11) and branch pipelines connected to the main pipeline and connected to each of the pressure gauges (26) to be tested.

8. The automatic detection system for temperature influence test of pressure instrument according to claim 1 is characterized in that: The control system comprises an electrically connected host computer (9) and a controller (24), the pressure generator (11) is connected to the controller (24) via a cable, and the camera (1) is connected to the host computer (9) via a data cable of the camera (1).

9. The automatic detection system for temperature influence test of pressure instrument according to claim 8 is characterized in that: The controller (24) is a PLC or a single chip microcomputer.

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