Automatic detection device for flow of compressed oxygen switch pressure reducer

Abstract

The application discloses a compressed oxygen switch pressure reducer flow automatic detection device, and relates to the technical field of compressed oxygen equipment detection.The device takes the latest national standard of the isolated compressed oxygen self-rescuer as the design basis, and aims to solve the problems of low detection efficiency, large result determination error and dependence on manual operation in the process of detecting the flow of the existing compressed oxygen switch pressure reducer.The device can realize the flow detection of the switch pressure reducer under 20MPa high pressure working condition and 5MPa low pressure working condition through the construction of a multi-channel test gas path, and can automatically complete the classification of the detection results through four channels based on the preset standard, wherein only the products with the flow of 1.5L / min under 20MPa high pressure and the flow of 1.2-1.5L / min under 5MPa low pressure are determined as qualified, and the rest are classified into the unqualified channel.The application realizes the automation of flow detection and sorting, improves the detection accuracy and efficiency, and meets the quality control requirements in the production process of the isolated compressed oxygen self-rescuer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection devices, in particular to a compressed oxygen switch pressure reducer flow automatic detection device. BACKGROUND

[0002] The isolated compressed oxygen self-rescuer is a key equipment for emergency escape of personnel in high-risk environments such as mines and chemical industries, and the flow stability of the core component, the compressed oxygen switch pressure reducer, directly determines the oxygen supply reliability of the self-rescuer. According to the latest national standard requirements for the isolated compressed oxygen self-rescuer, the switch pressure reducer needs to maintain stable flow output under the initial pressure of 20 MPa high pressure and the working condition of 5 MPa low pressure, and the qualified flow range needs to be controlled within 1.2-1.5 L / min. Products with flow fluctuations outside this range or under high and low pressure working conditions are judged as unqualified.

[0003] The traditional switch pressure reducer flow detection mainly adopts manual operation mode: the operator manually connects the gas circuit, adjusts the pressure, reads the flow count value, and manually sorts the products into qualified or unqualified areas according to the readings. This mode has the following problems: first, manual pressure adjustment is prone to errors, which affects the accuracy of flow detection results; second, manual reading of flow data is low in efficiency, and it takes a long time to detect each product, which is difficult to meet the detection needs of batch production; third, manual sorting is prone to misclassification and omission, and there is a risk of unqualified products flowing into the market. Therefore, it is urgent to design an integrated device that can automatically complete pressure adjustment, flow detection and product sorting to improve detection efficiency and accuracy. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a compressed oxygen switch pressure reducer flow automatic detection device. The technical problem to be solved by the present application is how to provide a device that can automatically, accurately and safely detect the flow of the compressed oxygen switch pressure reducer.

[0005] The purpose of the present application can be realized by the following technical scheme: a compressed oxygen switch pressure reducer flow automatic detection device, characterized in that it comprises a gas inlet unit, a high-pressure test gas circuit, a low-pressure test gas circuit, a flow detection unit, a sorting execution unit, a control unit and a rotary workbench.

[0006] The rotary workbench comprises a turntable and a driving mechanism for intermittently rotating the turntable, and at least three test stations for installing the measured compressed oxygen switch pressure reducer are uniformly arranged on the circumference of the turntable.

[0007] The gas inlet unit comprises a gas inlet, a gas cylinder and a gas release switch, the gas inlet is communicated with the gas cylinder through a pipeline, and the gas release switch is arranged on the outlet end pipeline of the gas cylinder for controlling the on-off of the gas output of the gas cylinder.

[0008] The high-pressure test gas path comprises a first electromagnetic valve, a first pressure gauge, a first exhaust valve and a high-pressure test head, the gas cylinder is connected with the first electromagnetic valve, the first pressure gauge in sequence through a pipeline and finally connected to the high-pressure test head;

[0009] The low-pressure test gas path comprises a pressure reducing valve, a second electromagnetic valve, a second pressure gauge, a second exhaust valve and a low-pressure test head, the gas cylinder is connected with the pressure reducing valve, the second electromagnetic valve, the second pressure gauge in sequence through a pipeline and finally connected to the low-pressure test head, the pressure reducing valve is used to reduce the gas pressure output by the gas cylinder to 5 MPa;

[0010] The high-pressure test head and the low-pressure test head are fixedly arranged on one side of the outer periphery of the rotating disc adjacent to each other and respectively face two adjacent test stations when the rotating disc is stopped, so that one test station is connected with the high-pressure test head and the other test station adjacent to it is connected with the low-pressure test head;

[0011] The flow detection unit is connected with the high-pressure test head and the low-pressure test head respectively and is used to collect the gas flow data in the high-pressure test and the low-pressure test in real time;

[0012] The sorting execution unit is arranged downstream of the rotating disc and comprises a four-channel sorting slide corresponding to different detection results, wherein: channel one corresponds to qualified products with high-pressure test flow rate ≥ 1.5 L / min and low-pressure test flow rate between 1.2-1.5 L / min; channel two corresponds to unqualified products with high-pressure test flow rate < 1.5 L / min but low-pressure test flow rate between 1.2-1.5 L / min; channel three corresponds to unqualified products with high-pressure test flow rate ≥ 1.5 L / min but low-pressure test flow rate not between 1.2-1.5 L / min; and channel four corresponds to unqualified products with high-pressure test flow rate < 1.5 L / min and low-pressure test flow rate not between 1.2-1.5 L / min; the control unit is electrically connected with the driving mechanism, the first electromagnetic valve, the second electromagnetic valve, the flow detection unit and the sorting execution unit. The control unit is configured to control the rotating disc to rotate intermittently at a fixed angle to make the test stations step by step, and when the rotating disc stops, the control unit synchronously controls the first electromagnetic valve and the second electromagnetic valve to open, and simultaneously performs high-pressure test on the pressure reducer under the high-pressure test head and low-pressure test on the other pressure reducer under the adjacent low-pressure test head. After the test is completed, the electromagnetic valves are closed and the corresponding exhaust valves are triggered to release pressure, and then the rotating disc rotates by one station. In this way, for a single pressure reducer to be tested, high-pressure test is performed when it stops under the high-pressure test head for the first time, and low-pressure test is performed when it stops under the low-pressure test head next time, so as to ensure the test sequence of “high pressure first and low pressure later”. For two adjacent stations, high-pressure test and low-pressure test are performed synchronously. When the pressure reducer to be tested completes all tests and rotates to the sorting station, the control unit controls the sorting execution unit to guide it into the corresponding channel according to the comparison result of its high-pressure flow rate and low-pressure flow rate.

[0013] Further, the rated pressure of the gas storage cylinder is not less than 20 MPa, and a pressure safety valve is arranged on the pipeline at the inlet end of the gas storage cylinder to automatically release pressure when the pressure in the pipeline exceeds 20 MPa.

[0014] Further, the flow detection unit comprises two independent high-precision gas mass flow meters connected to the high-pressure test gas circuit and the low-pressure test gas circuit, respectively, and the measurement accuracy is not less than ±1% FS and the range covers 0-5 L / min.

[0015] Further, the control unit comprises a PLC controller and a human-computer interaction interface, and the human-computer interaction interface is used to display real-time detection pressure, flow rate data and sorting results of each station and support modification and storage of detection standard parameters.

[0016] Further, the first exhaust valve and the second exhaust valve are both electromagnetic control exhaust valves, which are automatically controlled to open or close by the control unit according to the detection process.

[0017] Further, the data storage unit is electrically connected with the control unit, and is used for recording the high-pressure flow value, the low-pressure flow value, the detection time and the sorting channel information of each product to be detected.

[0018] Further, the rotating workbench, the high-pressure test gas circuit and the low-pressure test gas circuit are provided as two sets, forming two independent test units.

[0019] Further, the two test units are simultaneously and in parallel detected.

[0020] Further, the sorting execution unit further comprises two grippers horizontally moved up and down by driving cylinders, which are arranged above the rotating disc and oppositely arranged above and below the work station where the test is completed, and are used for grabbing and transferring the pressure reducer which has completed the test from the test work station to the entrance of the sorting slide;

[0021] The four-channel sorting slide comprises a main slide directly receiving the product transferred by the gripper, and a first swing member swingable left and right is hinged to the outlet end of the main slide; the four-channel sorting slide is sequentially divided into channel one, channel two, channel three and channel four by a first partition plate, a second partition plate and a third partition plate;

[0022] The first partition plate and the second partition plate are provided with a second swing member swingable left and right, and the second partition plate and the third partition plate are provided with a third swing member swingable left and right.

[0023] Further, the first swing member, the second swing member and the third swing member are electrically connected with the control unit; the control unit cooperatively controls the swing directions of the swing members according to the detection results as follows:

[0024] When the product is determined to enter the channel one or the channel two, the first swing member is controlled to swing in the clockwise direction to guide the product to the entrance area of the channel one and the channel two, and the second swing member is synchronously controlled to swing to selectively guide the product into the channel one or the channel two;

[0025] When the product is determined to enter the channel three or the channel four, the first swing member is controlled to swing in the counterclockwise direction to guide the product to the entrance area of the channel three and the channel four, and the third swing member is synchronously controlled to swing to selectively guide the product into the channel three or the channel four.

[0026] Compared with the prior art, the technical effect of the present application is: 1. High detection accuracy: by setting high-precision flow sensors and pressure sensors, cooperating with automatic data acquisition and analysis of the central control unit, avoiding manual operation errors, ensuring the accuracy of flow detection results under 20MPa high pressure and 5MPa low pressure working conditions, meeting the latest national standard requirements of the self-rescuer with isolated compressed oxygen.

[0027] II. High detection efficiency: The device can automatically complete the working condition switching and gas path control of high pressure testing and low pressure testing without manual step-by-step operation, greatly shortening the detection time of a single switch pressure reducer, and adapting to the efficient detection needs of batch production scenes.

[0028] III. Strong classification reliability: Based on the preset detection logic, the sorting execution module can automatically accurately classify qualified products (1 channel) and different types of unqualified products (2, 3, and 4 channels), avoiding judgment errors of manual sorting, and ensuring the reliability of product quality control.

[0029] IV. Good operation convenience: The man-machine interaction is realized through the touch display screen, the operator can intuitively view the detection process and result, and the device has an abnormal alarm function, which can timely find problems such as insufficient gas source pressure and gas path leakage, reducing the operation difficulty and fault troubleshooting cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a perspective view of the present application.

[0031] Fig. 2 is an enlarged view of A of the present application.

[0032] Fig. 3 is a test gas path principle diagram of the present application.

[0033] Figure number mark: 10, measured compressed oxygen switch pressure reducer; 100, gas inlet unit; 200, high pressure test gas path; 201, high pressure test head; 300, low pressure test gas path; 301, low pressure test head; 400, flow detection unit; 500, sorting execution unit; 501, gripper; 502, driving cylinder; 503, main slide; 504, first swing piece; 505, first partition plate; 506, second partition plate; 507, third partition plate; 508, channel one; 509, channel two; 510, channel three; 511, channel four; 512, second swing piece; 513, third swing piece; 600, control unit; 700, rotary workbench; 701, turntable; 702, driving mechanism; 703, test station. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. The terms "mounting", "connected", "connecting" should be interpreted broadly, for example, can be mechanical connection or electrical connection, can be internal communication of two elements, can be direct connection or indirect connection through intermediate medium, and the specific meaning of the above terms can be understood according to the specific circumstances by those skilled in the art.

[0036] According to the accompanying drawings Figs. 1 to 3 The present application provides a compressed oxygen switch pressure reducer flow automatic detection device, which comprises an air inlet unit 100, a high-pressure test gas circuit 200, a low-pressure test gas circuit 300, a flow detection unit 400, a sorting execution unit 500, a control unit 600 and a rotary workbench 700.

[0037] The rotary workbench 700 comprises a circular turntable 701 and a driving mechanism 702 for intermittently rotating the turntable 701, and the driving mechanism 702 is preferably a servo motor or a stepper motor matched with a cam divider. Six test stations 703 for mounting the measured compressed oxygen switch pressure reducer 10 are evenly arranged on the circumference of the turntable 701. Each test station 703 is provided with a quick connector for quick connection and sealing with the outlet end of the measured pressure reducer.

[0038] The air inlet unit 100 comprises an air inlet, a gas storage cylinder and a gas release switch. The air inlet is communicated with the inlet of the gas storage cylinder through a high-pressure pipeline for connecting an external high-pressure gas source. The rated pressure of the gas storage cylinder is not less than 20 MPa for stabilizing the gas source pressure. The gas release switch is a manual ball valve arranged on the outlet end pipeline of the gas storage cylinder for manually cutting off the gas output in the case of device maintenance or emergency. A pressure safety valve is also arranged on the inlet end pipeline of the gas storage cylinder, which will automatically open to release pressure when the pipeline pressure accidentally exceeds 20 MPa, ensuring the safety of the system.

[0039] The high-pressure test gas circuit 200 comprises a first electromagnetic valve, a first pressure gauge, a first exhaust valve and a high-pressure test head 201. The outlet of the gas storage cylinder is connected to the first electromagnetic valve, the first pressure gauge and finally to the high-pressure test head 201 through high-pressure pipelines. The first pressure gauge is used to directly display the pressure value of the high-pressure test gas circuit 200. The first exhaust valve is an electromagnetic control exhaust valve, the inlet of which is connected to the pipeline between the first electromagnetic valve and the high-pressure test head 201, and the outlet is open to the atmosphere. After each high-pressure test, the control unit 600 will control the first exhaust valve to open briefly to release the residual pressure in the pipeline.

[0040] The low-pressure test gas path 300 includes a pressure reducing valve, a second electromagnetic valve, a second pressure gauge, a second exhaust valve and a low-pressure test head 301. The outlet of the gas cylinder is first connected to the inlet of the pressure reducing valve through the high-pressure pipeline, and the outlet of the pressure reducing valve is sequentially connected to the second electromagnetic valve, the second pressure gauge and finally connected to the low-pressure test head 301. The pressure reducing valve is used to stably reduce the high-pressure gas from the gas cylinder to 5 MPa to simulate the low-pressure test working condition. The second pressure gauge is used to display the pressure value of the low-pressure test gas path 300. The second exhaust valve is also an electromagnetic control exhaust valve, and its inlet is connected to the pipeline between the second electromagnetic valve and the low-pressure test head 301, which is used for pressure relief after testing.

[0041] The high-pressure test head 201 and the low-pressure test head 301 are completely identical in structure, and are both quick butt joints with sealing rings. They are fixedly installed adjacent to the outer periphery of the rotating disc 701 and respectively face two adjacent test stations 703 of the rotating disc 701 when the rotating disc 701 is intermittently stopped. Specifically, when the rotating disc 701 is stopped, one of the test stations 703 is just located directly below the high-pressure test head 201 and can be butt-jointed with the high-pressure test head 201, and the next test station 703 adjacent to it is located directly below the low-pressure test head 301 and can be butt-jointed with the low-pressure test head 301.

[0042] The flow detection unit 400 includes two independent high-precision gas mass flowmeters. The first flowmeter is connected in series to the high-pressure test gas path 200, specifically between the first electromagnetic valve and the high-pressure test head 201. The second flowmeter is connected in series to the low-pressure test gas path 300, specifically between the second electromagnetic valve and the low-pressure test head 301. The measurement accuracy of the two gas mass flowmeters is not less than ±1% FS, and the range covers 0-5 L / min, which can real-time and accurately collect the gas flow data during the high-pressure test and the low-pressure test, and transmit the data signal to the control unit 600.

[0043] The sorting execution unit 500 is arranged downstream of the rotating table 701 and after the last test station 703. It includes two mechanical grippers 501 moving up and down and horizontally by a driving cylinder 502 and a four-channel sorting slide. The mechanical grippers 501 are arranged above the rotating table 701 and opposite the test stations for completing high and low pressure tests. When the product completes the test and rotates to the sorting station, the control unit 600 controls the driving cylinder 502 to act, so that the gripper 501 is lowered and grasps the tested pressure reducer, and then is horizontally moved to place it into the entrance of the sorting slide. The four-channel sorting slide includes a main slide 503 directly receiving the product moved by the gripper 501. The outlet end of the main slide 503 is hinged with a first swing member 504 swingable left and right. The inside of the slide is sequentially separated into four independent slides by a first separation plate 505, a second separation plate 506 and a third separation plate 507, defined as channel one 508, channel two 509, channel three 510 and channel four 511. In the area between the first separation plate 505 and the second separation plate 506, a second swing member 512 swingable left and right is arranged. In the area between the second separation plate 506 and the third separation plate 507, a third swing member 513 swingable left and right is arranged. The first swing member 504, the second swing member 512 and the third swing member 513 are all swing mechanisms driven by micro-cylinders, and the swing directions thereof are accurately controlled by the control unit 600.

[0044] The control unit 600 preferably includes a PLC and a man-machine interface connected thereto. The control unit 600 is electrically connected with the driving mechanism 702 of the rotating table 700, the first electromagnetic valve, the second electromagnetic valve, the first exhaust valve, the second exhaust valve, the first and second flow meters of the flow detection unit 400, and the driving cylinder 502 and each swing member of the sorting execution unit 500 respectively through cables. The device is also provided with a data storage unit electrically connected with the PLC of the control unit 600, for separately recording the serial number, high pressure flow value, low pressure flow value, detection time stamp and final sorting channel information of each tested product, facilitating quality tracing and analysis.

[0045] The working process of the device is as follows:

[0046] Preparation stage: The operator starts the device through the man-machine interface. The external high pressure gas source charges the gas cylinder through the gas inlet. The operator installs the compressed oxygen switch pressure reducer to be tested into each test station 703 of the rotating table 701 in turn.

[0047] Start testing: The control unit 600 controls the driving mechanism 702 to drive the rotating table 701 to rotate intermittently at a fixed angle.

[0048] Synchronous testing: when the turntable 701 stops, assume that the pressure reducer on station A is opposite the high-pressure test head 201, and the pressure reducer on station B is opposite the low-pressure test head 301. The control unit 600 synchronously issues a command to open the first electromagnetic valve and the second electromagnetic valve. The high-pressure gas passes through the first electromagnetic valve, the first flowmeter, and the high-pressure test head 201 into the pressure reducer on station A, and high-pressure flow testing is performed. The first flowmeter monitors the flow data in real time and uploads it to the PLC. At the same time, the gas reduced by the pressure reducing valve passes through the second electromagnetic valve, the second flowmeter, and the low-pressure test head 301 into the pressure reducer on station B, and low-pressure flow testing is performed. The second flowmeter monitors the flow data in real time and uploads it to the PLC.

[0049] After the preset test time arrives, the control unit 600 closes the first electromagnetic valve and the second electromagnetic valve, and then briefly opens the first exhaust valve and the second exhaust valve to release the residual pressure in the corresponding test gas circuit and the pressure reducer.

[0050] Data recording and station stepping: the PLC records the high-pressure flow value of the pressure reducer on station A and the low-pressure flow value of the pressure reducer on station B. Subsequently, the control unit 600 triggers the drive mechanism 702 again to rotate the turntable 701 by one station. At this time, the original pressure reducer on station A moves to the original position of station B, and will receive low-pressure testing in the next stop; while a new pressure reducer to be tested enters the high-pressure test station 703.

[0051] Sorting decision and execution: when a pressure reducer completes low-pressure testing in subsequent rotation and finally rotates to the sorting station, the PLC has the complete high-pressure flow value and low-pressure flow value of the pressure reducer.

[0052] The control unit 600 makes a decision according to the preset standard: if Q_high≥1.5 L / min and Q_low is between 1.2-1.5 L / min, it is determined to be a qualified product, and the target channel is channel one 508. If Q_high<1.5 L / min and Q_low is between 1.2-1.5 L / min, it is determined to be an unqualified product, and the target channel is channel two 509. If Q_high≥1.5 L / min and Q_low is not between 1.2-1.5 L / min, it is determined to be an unqualified product, and the target channel is channel three 510. If Q_high<1.5 L / min and Q_low is not between 1.2-1.5 L / min, it is determined to be an unqualified product, and the target channel is channel four 511.

[0053] The control unit 600 controls the gripper 501 to pick up the pressure reducer and move it to the main chute 503 entrance of the sorting chute. At the same time, the control unit 600 controls the swing members according to the target channel: target channel one 508 or channel two 509: control the first swing member 504 to swing clockwise to guide the product to the entrance area of channel one 508 and channel two 509. Then: if the target is channel one 508, control the second swing member 512 to swing to the position of guiding the product into channel one 508. If the target is channel two 509, control the second swing member 512 to swing to the position of guiding the product into channel two 509. Target channel three 510 or channel four 511: control the first swing member 504 to swing counterclockwise to guide the product to the entrance area of channel three 510 and channel four 511. Then: if the target is channel three 510, control the third swing member 513 to swing to the position of guiding the product into channel three 510. If the target is channel four 511, control the third swing member 513 to swing to the position of guiding the product into channel four 511.

[0054] Cycle and traceability: the above process is repeated to realize continuous automatic detection and sorting of the pressure reducer. All detection data is stored in the data storage unit for subsequent query, statistics and quality analysis.

[0055] On the basis of the above embodiment, in order to further improve the detection efficiency and meet the demand of large-scale production, the rotating workbench 700, the high-pressure test gas circuit 200 and the low-pressure test gas circuit 300 are all set to two sets, forming two independent test units, which are symmetrically arranged. The two test units share the same air inlet unit 100, control unit 600 and data storage unit, but have their own independent flow detection unit 400 and sorting execution unit 500. The control unit 600 is configured to control the operation of the two test units simultaneously and in parallel. That is, the turntable 701A and the turntable 701B rotate synchronously and intermittently, and their high-pressure test and low-pressure test are also carried out synchronously. This makes the detection throughput of the device almost double, greatly improving the production efficiency.

[0056] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A compressed oxygen switch decompressor flow automatic detection device, characterized in that, The test device comprises an air inlet unit (100), a high-pressure test gas path (200), a low-pressure test gas path (300), a flow detection unit (400), a sorting execution unit (500), a control unit (600) and a rotating workbench (700). The rotating workbench (700) comprises a rotating disc (701) and a driving mechanism (702) for driving the rotating disc (701) to rotate intermittently, and at least three test stations (703) for mounting the measured compressed oxygen switch pressure reducer (10) are uniformly arranged on the rotating disc (701) in the circumferential direction. The air inlet unit (100) comprises an air inlet, a gas storage cylinder and a gas release switch, the air inlet is communicated with the gas storage cylinder through a pipeline, and the gas release switch is arranged on the pipeline at the outlet end of the gas storage cylinder and is used for controlling the on-off of the gas output of the gas storage cylinder. The high-pressure test gas path (200) comprises a first electromagnetic valve, a first pressure gauge, a first exhaust valve and a high-pressure test head (201), and the gas storage cylinder is connected to the high-pressure test head (201) through a pipeline in sequence. The low-pressure test gas path (300) comprises a pressure reducing valve, a second electromagnetic valve, a second pressure gauge, a second exhaust valve and a low-pressure test head (301), and the gas storage cylinder is connected to the low-pressure test head (301) through a pipeline in sequence. The high-pressure test head (201) and the low-pressure test head (301) are fixedly arranged on one side of the outer periphery of the rotating disc (701) in sequence and respectively face two adjacent test stations (703) when the rotating disc (701) stops, so that one test station (703) is connected with the high-pressure test head (201) and the other adjacent test station (703) is connected with the low-pressure test head (301). The flow detection unit (400) is connected with the high-pressure test head (201) and the low-pressure test head (301) respectively, and is used for collecting the gas flow data in the high-pressure test and the low-pressure test in real time. The sorting execution unit (500) is arranged downstream of the rotating disc (701) and comprises a four-channel sorting slide, and the four-channel sorting slide corresponds to different detection results, wherein: Channel one (508) corresponds to qualified products with high-pressure test flow ≥1.5L / min and low-pressure test flow between 1.2-1.5L / min; Channel two (509) corresponds to unqualified products with high-pressure test flow <1.5L / min but low-pressure test flow between 1.2-1.5L / min; Channel three (510) corresponds to unqualified products with high-pressure test flow ≥1.5L / min but low-pressure test flow not between 1.2-1.5L / min; Channel four (511) corresponds to unqualified products with high-pressure test flow <1.5L / min and low-pressure test flow not between 1.2-1.5L / min; The control unit (600) is electrically connected with the driving mechanism (702), the first electromagnetic valve, the second electromagnetic valve, the flow detection unit (400) and the sorting execution unit (500).

2. The compressed oxygen switch decompressor flow automatic detection device according to claim 1, characterized in that, The pressure of the gas cylinder is not less than 20 MPa, and a pressure safety valve is arranged on the pipeline at the inlet end of the gas cylinder to automatically release pressure when the pressure in the pipeline exceeds 20 MPa.

3. The compressed oxygen switch decompressor flow automatic detection device according to claim 1, characterized in that, The flow detection unit (400) comprises two independent high-precision gas mass flow meters, which are connected to the high-pressure test gas path (200) and the low-pressure test gas path (300) respectively, and the measurement accuracy is not less than ±1% FS, and the range covers 0-5 L / min.

4. The compressed oxygen switch decompressor flow automatic detection device according to claim 1, characterized in that, The control unit (600) comprises a PLC controller and a man-machine interface, and the man-machine interface is used for displaying real-time detection pressure, flow data and sorting results of each station, and supporting modification and storage of detection standard parameters.

5. The compressed oxygen switch decompressor flow automatic detection device of claim 1, wherein, The first exhaust valve and the second exhaust valve are both electromagnetic control exhaust valves, which are automatically controlled to be opened or closed by the control unit (600) according to the detection process.

6. The compressed oxygen switch decompressor flow automatic detection device of claim 1, wherein, The data storage unit is electrically connected with the control unit (600) and is used for recording high-pressure flow value, low-pressure flow value, detection time and sorting channel information of each product to be detected.

7. The compressed oxygen switch decompressor flow automatic detection device of claim 1, wherein, The rotary workbench (700), the high-pressure test gas path (200) and the low-pressure test gas path (300) are both provided with two sets, forming two independent test units.

8. The compressed oxygen switch decompressor flow automatic detection device according to claim 7, characterized in that, The two test units are simultaneously and in parallel detected.

9. The automatic flow detection device for compressed oxygen on-off pressure reducer according to any one of claims 1 to 8, characterized in that, The sorting execution unit (500) further comprises two grippers (501) which are horizontally moved up and down by driving cylinders (502), and the grippers (501) are arranged above the rotary table (701) and oppositely arranged above and below the test station, and are used for grabbing and transferring the pressure reducer which has completed the test from the test station (703) to the entrance of the sorting slide; The four-channel sorting slide comprises a main slide (503) which directly receives the product transferred by the gripper (501), and the outlet end of the main slide (503) is hinged with a first swing member (504) which swings left and right; the four-channel sorting slide is sequentially divided into channel one (508), channel two (509), channel three (510) and channel four (511) by a first partition plate (505), a second partition plate (506) and a third partition plate (507); A second swing member (512) which can swing left and right is arranged between the first partition plate (505) and the second partition plate (506), and a third swing member (513) which can swing left and right is arranged between the second partition plate (506) and the third partition plate (507).

10. The automatic flow detection device for compressed oxygen on-off reducer according to claim 9, characterized in that, The first swing member (504), the second swing member (512) and the third swing member (513) are electrically connected with the control unit (600); the control unit (600) cooperatively controls the swing directions of the swing members according to the detection results as follows: When the product is determined to enter the channel one (508) or the channel two (509), the first swing member (504) is controlled to swing in the clockwise direction to guide the product to the entrance area of the channel one (508) and the channel two (509), and the second swing member (512) is synchronously controlled to swing to selectively guide the product into the channel one (508) or the channel two (509). When the product is determined to enter the third passage (510) or the fourth passage (511), the first swing member (504) is controlled to swing counterclockwise to guide the product to the entrance area of the third passage (510) and the fourth passage (511), and the third swing member (513) is controlled to swing synchronously to selectively guide the product into the third passage (510) or the fourth passage (511).

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