Full-automatic verification device and method for low-temperature gas cylinder safety valve

Abstract

The invention discloses a full-automatic checking device and method for a low-temperature gas cylinder safety valve, and belongs to the technical field of safety valve checking. The full-automatic checking device comprises a checking table, a to-be-checked feeding area, a checking area and a checked discharging area are arranged on the table top of the checking table, a gas path system and a control system are arranged in the checking table, and the to-be-checked feeding area is provided with a feeding assembly; the verification area is provided with a mechanical arm and a plurality of clamping testing mechanisms, and the detected discharging area is provided with an unqualified product box and a qualified product box. Automatic feeding and discharging in the safety valve checking process are achieved through the mechanical arm and the control system, before checking, the mechanical arm grabs the safety valve from the material disc and places the safety valve on the clamping testing mechanism, after checking is finished, the mechanical arm takes down the safety valve and automatically sorts the safety valve into a qualified product box or an unqualified product box, manual participation is not needed, manual labor is reduced, and the working efficiency is improved. The utilization rate of verification personnel is improved, the safety risk of the verification personnel is effectively avoided, the six clamping test mechanisms can work at the same time, the average verification time of a single valve is greatly shortened, and the verification efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of safety valve calibration, and in particular relates to a fully automatic calibration device and method for a safety valve of a cryogenic gas cylinder. Background Art

[0002] Cryogenic gas cylinder safety valves are installed on cryogenic gas cylinders to protect them from overpressure, ensuring the cylinder pressure remains within a safe range. When the pressure in the cylinder exceeds the safe range, the valve automatically opens to release the pressure, preventing accidents such as cylinder explosions. Cryogenic gas cylinder safety valves generally require annual calibration before and during use. Calibration is primarily performed using a safety valve calibration bench to provide a pressure source and control the pressure, simulating actual operating conditions to cause the valve to trip and verify the accuracy of its trip pressure.

[0003] At present, the safety valves of cryogenic gas cylinders are calibrated manually, that is, all calibration work is completed through manual loading, manual calibration, manual clamping, and manual unloading: Manual loading, since the safety valves of cryogenic gas cylinders are all threaded connections, the calibrator needs to manually remove each safety valve from the material tray to be inspected and install it on the clamping device of the calibration table before calibration; Manual clamping, when the safety valve is calibrated, it needs to be pressurized by the air source to meet the pressure requirements of the calibration. Before calibration, it is necessary to wrap the raw tape around the thread of the safety valve to be tested and tighten it on the clamping table with a wrench; Manual calibration, during calibration, the air inlet valve and pressure relief valve are manually controlled, and the pressure gauge reading is observed in real time to complete the calibration work; Manual unloading, after the safety valve is calibrated, it needs to be removed from the clamping table and placed in the inspected material tray. At the same time, manual sorting of qualified and unqualified safety valves is required.

[0004] All existing cryogenic gas cylinder safety valve calibration operations rely on manual labor, which greatly affects calibration efficiency. In addition, the clamping table is close to the calibration personnel, which poses certain safety risks during calibration. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing cryogenic gas cylinder safety valve calibration relies entirely on manual labor, which greatly affects the calibration efficiency, and the clamping table is close to the calibration personnel, which poses certain safety risks during calibration. A fully automatic calibration device and method for cryogenic gas cylinder safety valves are proposed.

[0006] To solve the above technical problems, the present invention provides a fully automatic calibration device for a cryogenic gas cylinder safety valve, comprising a calibration table, the table top of which is provided with a material feeding area to be inspected, a calibration area, and a material discharge area after inspection, wherein the calibration area is located between the material feeding area to be inspected and the material discharge area after inspection, and the calibration table is provided with an air circuit system and a control system;

[0007] The material feeding area to be inspected is provided with a loading assembly, and the loading assembly includes a material tray stacking rack and an empty tray stacking rack arranged in the material feeding area to be inspected, wherein a placement area to be inspected is provided between the material tray stacking rack and the empty tray stacking rack, the material tray stacking rack is used to stack material trays equipped with safety valves to be inspected, the placement area to be inspected is used to place material trays to be inspected, and the empty tray stacking rack is used to stack empty material trays, the loading assembly also includes a material tray lifting mechanism, an empty tray lifting mechanism and a linear tray moving mechanism, the material tray lifting mechanism is used to lift the material tray above the bottom layer of the material tray stacking rack, the empty tray lifting mechanism is used to lift the empty material tray above the bottom layer of the empty tray stacking rack, and the linear tray moving mechanism is used to move the material tray at the bottom layer of the material tray stacking rack to the placement area to be inspected, or move the empty material tray in the placement area to be inspected to the empty tray stacking rack;

[0008] The verification area is provided with a robotic arm and multiple clamping test mechanisms. The robotic arm is located in the middle of the multiple clamping test mechanisms. The robotic arm is used to grab the safety valve to be tested from the material tray in the to-be-tested placement area and place it on the clamping test mechanism, or remove the verified safety valve from the clamping test mechanism; the clamping test mechanism includes a test fixture, two clamping cylinders, a side-moving cylinder and a downward pressure cylinder. The test fixture is used to install the safety valve to be tested. The two clamping cylinders are distributed on both sides of the test fixture and are used to clamp the safety valve to be tested. The side-moving cylinder is used to move the test fixture with the safety valve to be tested to the bottom of the downward pressure cylinder. The downward pressure cylinder is used to press the safety valve to be tested.

[0009] The inspected material area is provided with a box for unqualified products and a box for qualified products. The box for unqualified products is located on one side of the countertop of the inspected material area, and the box for qualified products is located on the other side of the countertop of the inspected material area.

[0010] The air circuit system includes several intake pipes and exhaust pipes connected to the clamping test mechanism, the other end of the intake pipe is connected to the air source, a pressure sensor is provided on the intake pipe, and a flow sensor is provided on the exhaust pipe; it also includes several cylinder branches connected to the cylinders and a cylinder main air circuit connected to the cylinder branches.

[0011] The control system includes an electromagnetic control valve, a flow control valve and a pressure relief valve arranged on the air intake pipe, a master control valve arranged on the cylinder main gas line, a pressure reducing valve and an electromagnetic valve arranged on the cylinder branch line.

[0012] As a further description of the above technical solution, the upper surface of the material tray is provided with a plurality of safety valve accommodating grooves distributed in an array, and the safety valve accommodating grooves are used to place the safety valves to be calibrated.

[0013] As a further description of the above technical solution, the tray lifting mechanism includes a tray lifting cylinder, and a tray support plate is fixed to the top of the cylinder shaft of the tray lifting cylinder. The tray support plate is inserted between the tray on the bottom layer and the second-to-last tray on the tray stacking rack. Before verification, the cylinder shaft of the tray lifting cylinder is extended, and the tray support plate at the top of the cylinder shaft lifts the trays on the second-to-last layer and above that are filled with safety valves to be tested, making it convenient for the linear tray moving mechanism to move the tray on the bottom layer to the placement area to be inspected.

[0014] As a further illustration of the above technical solution, the empty tray lifting mechanism includes an empty tray lifting cylinder with an empty tray support plate fixed to the top of its cylinder shaft. The empty tray support plate is inserted between the empty trays on the bottom and second-to-last empty trays on the empty tray stacking rack. When the trays in the verification storage area are emptied, the cylinder shaft of the empty tray lifting cylinder extends, and the empty tray support plate on the top of the cylinder shaft lifts the empty trays on the second-to-last layer and above, facilitating the linear tray transfer mechanism to move the empty trays in the verification storage area to the empty tray stacking rack.

[0015] As a further description of the above technical solution, the linear tray moving mechanism includes a linear cylinder, which is fixed at a place away from the tray stacking rack. One end of the cylinder shaft of the linear cylinder extends under the tray stacking rack. A vertical lifting cylinder is fixed on the cylinder shaft. The vertical lifting cylinder can move linearly due to the extension and contraction of the cylinder shaft. A support plate is fixed on the cylinder shaft of the vertical lifting cylinder.

[0016] As a further description of the above technical solution, the material tray stacking rack is composed of four first angle steel frames fixed on the table top, wherein the two first angle steel frames close to the inspection placement area are provided with material tray outlets for moving out of the material tray, and the height of the material tray outlets is consistent with the height of the bottom material tray; the empty tray stacking rack is composed of four second angle steel frames fixed on the table top, wherein the two second angle steel frames close to the inspection placement area are provided with empty material tray entrances for moving in of the material tray, and the height of the empty material tray entrances is consistent with the height of the bottom empty material tray.

[0017] As a further description of the above technical solution, the test fixture is installed on a movable seat, and two clamping cylinders are symmetrically arranged on both sides of the test fixture. A clamping block is fixed on the cylinder shaft of the clamping cylinder, and a clamping groove for clamping the safety valve to be tested is provided on the side of the clamping block close to the test fixture; the side-moving cylinder is fixed on the side of the mounting seat, and the cylinder shaft of the side-moving cylinder passes through the mounting seat and is connected to the movable block, and the movable block is fixed on the side of the cylinder shaft of the movable cylinder, and the other side of the movable block is fixedly connected to the movable seat; a vertical plate is fixed on the top of the mounting seat, and a support plate is fixed on one side of the upper side of the vertical plate, and the downward-pressing cylinder is fixed on the support plate, and a through hole is opened on the support rod for the cylinder shaft of the downward-pressing cylinder to pass through, and the downward-pressing cylinder and the test fixture are located on the same side of the vertical plate.

[0018] As a further description of the above technical solution, the material unloading mechanism has been detected and the material unloading area is also provided with a material unloading mechanism, and the material unloading mechanism includes two first fixed seats fixed on the table, and a first roller is installed between the two first fixed seats. An extension plate is hinged between the two fixed seats, and one end of the extension plate extends out of the table and is connected to the qualified product box. A second roller is fixed on the qualified product box, and a conveyor belt is provided between the first roller and the second roller.

[0019] The fully automatic calibration device for the safety valve of a cryogenic gas cylinder of the present invention realizes automatic loading and unloading of materials during the safety valve calibration process through a robotic arm and a control system. Before calibration, the robotic arm grabs the safety valve from the material tray and places it on the clamping test mechanism. After the calibration is completed, the robotic arm removes the safety valve from the clamping test mechanism and automatically sorts it into a qualified product box or a unqualified product box according to the calibration results.

[0020] In order to solve the above technical problems, the present invention also provides a fully automatic calibration method for the safety valve of a cryogenic gas cylinder, which adopts the above-mentioned calibration device and includes the following steps:

[0021] S1. Install the safety valve to be calibrated into the safety valve receiving slot of the tray and stack the tray on the tray stacking rack;

[0022] S2. With the assistance of the tray lifting mechanism, the linear tray moving mechanism moves the tray at the bottom of the tray stacking rack to the inspection placement area;

[0023] S3. The safety valve to be tested on the tray in the waiting-for-test placement area of ​​the robot arm is placed on the test fixture. The side-moving cylinder drives the test fixture to move to the bottom of the downward pressure cylinder and presses it tightly.

[0024] S4, the control system automatically completes the calibration work;

[0025] S5. Press down the cylinder to release the safety valve to be tested, and move the cylinder sideways to drive the test fixture back to its initial position.

[0026] S6. The robotic arm sorts the inspected safety valves into qualified product boxes or unqualified product boxes according to the inspection results;

[0027] S7. Repeat the above steps S3 to S6 until all the safety valves on the trays in the inspection area are cleared.

[0028] S8. With the assistance of the empty tray lifting mechanism, the linear tray moving mechanism moves the empty tray to the empty tray stacking rack.

[0029] As a further description of the above technical solution, step S4 is specifically as follows:

[0030] S41, close the pressure relief valve and open the electromagnetic control valve to allow air in;

[0031] S42, controlling the air intake of the flow control valve to slowly increase the pressure;

[0032] S43, when the flow sensor on the exhaust pipe detects that there is gas flow, collecting the pressure value of the pressure sensor;

[0033] S44. Repeat the check at least 3 times;

[0034] S45. Close the solenoid control valve and open the pressure relief valve to exhaust.

[0035] The fully automatic calibration method for the safety valve of a cryogenic gas cylinder of the present invention comprises the following steps: loading: before calibration, a material tray equipped with a safety valve is stacked on a material tray stack; during calibration, a material tray lifting mechanism controls the material trays to drop down in sequence, and a linear tray moving mechanism moves the material tray at the bottom layer to a placement area to be inspected for a robotic arm to grab the safety valve on the material tray; after the material is taken out, with the assistance of an empty tray lifting cylinder, the linear tray moving mechanism moves the empty material tray to the bottom layer of an empty tray stacking rack, and the empty material tray is manually moved away after the empty tray stacking rack is full; pressing: during calibration, after the robotic arm grabs the safety valve in the placement area to be inspected, it rotates 90 degrees and vertically and alternately places the safety valve on a test fixture of a plurality of clamping test mechanisms, and automatically pressurizes it by a downward pressure cylinder; calibration: an electromagnetic control valve controls the air intake of each clamping test mechanism, and when the safety valve is tightened, the electromagnetic control valve automatically intakes air and pressurizes, and a pressure sensor detects the pressure during the calibration process. When the calibration is completed, the pressure relief valve automatically opens and relieves the pressure; unloading: after the calibration is completed, the robotic arm places the safety valve into a defective product box or a qualified product box according to the calibration result.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) All verification processes (including loading, clamping, verification, and unloading) are completed automatically without manual participation, which reduces manual labor and improves the utilization rate of verification personnel.

[0038] (2) Multiple clamping test mechanisms operate simultaneously, greatly shortening the average calibration time of a single safety valve and improving calibration efficiency;

[0039] (3) The verification process is completed automatically without human intervention, effectively avoiding the safety risks of the verification personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural diagram of the fully automatic calibration device for the safety valve of a cryogenic gas cylinder of the present invention.

[0041] Figure 2 It is a structural diagram of the feeding area to be inspected.

[0042] Figure 3 It is a schematic diagram of the linear plate moving mechanism.

[0043] Figure 4 It is a structural diagram of the clamping test mechanism.

[0044] Figure 5 yes Figure 1 Enlarged view of part A in the middle.

[0045] Figure 6 yes Figure 1 Enlarged view of part B in the middle.

[0046] Figure 7 It is the connection structure diagram between the gas system and the control system.

[0047] Legend:

[0048] 100-calibration table; 200-loading assembly; 210-material tray; 211-safety valve accommodating groove; 220-material tray stacking rack; 221-first angle steel frame; 222-material tray outlet; 230-empty tray stacking rack; 231-second angle steel frame; 240-material tray lifting mechanism; 241-material tray lifting cylinder; 242-material tray support plate; 250-empty tray lifting mechanism; 251-empty tray lifting cylinder; 252-empty tray support plate; 260-linear tray moving mechanism; 261-linear cylinder; 262-vertical lifting cylinder; 263-supporting plate; 300-robotic arm; 400-clamping test mechanism; 401-moving seat; 402-mounting seat; 403-moving block; 404-vertical plate; 405-support Plate; 410-test fixture; 420-clamping cylinder; 421-clamping block; 422-clamping groove; 430-side shift cylinder; 440-downward pressure cylinder; 500-rejected product box; 600-unloading mechanism; 601-fixed seat; 602-first roller; 603-extension plate; 604-second roller; 605-conveyor belt; 700-qualified product box; 800-air path system; 801-intake pipe; 802-pressure sensor; 803-exhaust pipe; 804-flow sensor; 805-cylinder main air path; 900-control system; 911-electromagnetic control valve; 912-flow control valve; 913-pressure relief valve; 921-master control valve; 922-pressure reducing valve; 923-electromagnetic valve. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] This embodiment provides a fully automatic calibration device for the safety valve of a cryogenic gas cylinder. Figure 1 — Figure 7 As shown, the calibration table 100 includes support legs at the bottom of the calibration table 100. The table top of the calibration table 100 is provided with a material feeding area to be inspected, a calibration area, and a material discharge area after inspection. The calibration area is located between the material feeding area to be inspected and the material discharge area after inspection. The calibration table 100 is provided with an air circuit system 800 and a control system 900.

[0051] The feeding area to be inspected is provided with a loading assembly 200, and the loading assembly 200 includes a tray stacking rack 220 and an empty tray stacking rack 230 arranged in the feeding area to be inspected, wherein a tray placement area to be inspected is provided between the tray stacking rack 220 and the empty tray stacking rack 230, and the tray stacking rack 220 is used to stack trays 210 equipped with safety valves to be inspected, and the surface of the tray 210 is provided with a plurality of safety valve receiving grooves 211 distributed in an array, and the safety valve receiving grooves 211 are used to place the safety valves to be inspected, and the tray stacking rack 220 is composed of four first angle steel frames 221 fixed on the table, wherein the first angle steel frame 221 near the safety valve to be inspected is provided. The two first angle steel frames 221 of the placement area are provided with tray outlets 222 for the material tray to be moved out, and the height of the tray outlet 222 is consistent with the height of the bottom tray 210; the inspection placement area is used to place the material tray 210 to be inspected, and the empty tray stacking rack 230 is used to stack the empty material trays 210. The empty tray stacking rack 230 is composed of four second angle steel frames 231 fixed on the table, wherein the two second angle steel frames 231 near the inspection placement area are provided with empty tray entrances for the material tray to be moved in, and the height of the empty tray entrances is consistent with the height of the bottom empty tray 210; the loading assembly 200 also includes a tray lifting machine The tray lifting mechanism 240, the empty tray lifting mechanism 250 and the linear tray moving mechanism 260, the tray lifting mechanism 240 includes a tray lifting cylinder 241, the top of the cylinder shaft of the tray lifting cylinder 241 is fixed with a tray supporting plate 242, the tray supporting plate 242 is inserted between the tray 210 at the bottom layer and the second to last tray 210 of the tray stacking rack, before the calibration, the cylinder shaft of the tray lifting cylinder 241 is extended, and the tray supporting plate 242 at the top of the cylinder shaft lifts the tray 210 filled with the safety valve to be tested above the bottom layer, so that the linear tray moving mechanism 260 can move the tray 210 at the bottom layer of the tray stacking rack 220 to the bottom layer. Placement area to be inspected; the empty tray lifting mechanism 250 includes an empty tray lifting cylinder 251, an empty tray supporting plate 252 is fixed to the top of the cylinder shaft of the empty tray lifting cylinder 251, and the empty tray supporting plate 252 is inserted between the empty tray 210 at the bottom layer and the empty tray 210 at the second-to-last layer of the empty tray stacking rack. During the inspection, when the trays 210 in the inspection placement area are emptied, the cylinder shaft of the empty tray lifting cylinder 251 extends, and the empty tray supporting plate 252 at the top of the cylinder shaft lifts the empty trays 210 at the second-to-last layer and above, making it convenient for the linear tray moving mechanism 260 to move the empty trays 210 in the inspection placement area to the empty tray stacking rack 230;The linear tray moving mechanism 260 includes a linear cylinder 261, which is fixed away from the tray stacking rack 220. One end of the cylinder shaft of the linear cylinder 261 extends below the tray stacking rack 220. A vertical lifting cylinder 262 is fixed on the cylinder shaft. The vertical lifting cylinder 262 can move linearly with the extension and contraction of the cylinder shaft. A supporting plate 263 is fixed on the cylinder shaft of the vertical lifting cylinder 262. The linear tray moving mechanism 260 is used to support and move the tray 210 at the bottom layer of the tray stacking rack 220 to the area to be inspected, or to support and move the empty tray 210 in the area to be inspected to the empty tray stacking rack 230.

[0052] The verification area is provided with a robotic arm 300 and six clamping test mechanisms 400. The six clamping test mechanisms 400 are arranged in two rows. The robotic arm 300 is located in the middle of the two rows of clamping test mechanisms 400. The robotic arm 300 is used to grab the safety valve to be tested from the material tray 210 in the inspection placement area and place it on the clamping test mechanism 400, or remove the verified safety valve from the clamping test mechanism 400; the clamping test mechanism 400 includes a test fixture 410, two clamping cylinders 420, a side shift cylinder 430 and a downward pressure cylinder 440. The test fixture 410 is used to install the safety valve to be tested. The two clamping cylinders 420 are distributed on both sides of the test fixture 410 for clamping the safety valve to be tested. The side shift cylinder 430 is used to move the test fixture 410 with the safety valve to be tested installed to the bottom of the downward pressure cylinder 440. The downward pressure cylinder 440 is used to press the safety valve to be tested.

[0053] As a specific embodiment of the present invention, the test fixture 410 is installed on the mobile seat 401, and the two clamping cylinders 420 are symmetrically arranged on both sides of the test fixture 410. A clamping block 421 is fixed on the cylinder shaft of the clamping cylinder 420, and a clamping groove 422 for clamping the safety valve to be tested is provided on the side of the clamping block 421 close to the test fixture 410; the side shift cylinder 430 is fixed on the side of the mounting seat 402, and the cylinder shaft of the side shift cylinder 430 passes through the mounting seat 402 and is connected to the moving block 4 03 connection, the moving block 403 is fixed on the side of the cylinder shaft of the moving cylinder 430, and the other side of the moving block 403 is fixedly connected to the moving seat 401; a vertical plate 404 is fixed on the top of the mounting seat 402, and a support plate 405 is fixed on one side of the upper part of the vertical plate 404, the downward-pressing cylinder 440 is fixed on the support plate 405, and a through hole is opened on the support rod 405 for the cylinder shaft of the downward-pressing cylinder 440 to pass through, and the downward-pressing cylinder 440 and the test fixture 410 are located on the same side of the vertical plate 404.

[0054] The detected material discharge area is provided with a defective product box 500, a discharge mechanism 600 and a qualified product box 700. The defective product box 500 is located on one side of the detected material discharge area table, and the discharge mechanism 600 and the qualified product box 700 are located on the other side of the detected material discharge area table. The discharge mechanism 600 includes two first fixed seats 601 fixed on the table, a first roller 602 is installed between the two first fixed seats 601, an extension plate 603 is hinged between the two fixed seats 601, the extension plate 603 can rotate around the fixed seat 601, one end of the extension plate 603 extends out of the table and is connected to the qualified product box 700, a second roller 604 is fixed on the qualified product box 700, and a conveyor belt 605 is provided between the first roller 602 and the second roller 604;

[0055] The air circuit system 800 includes several air intake pipes 801 and exhaust pipes 803 connected to the clamping test mechanism. The other end of the air intake pipe 801 is connected to the air source. The air intake pipe 801 is provided with a pressure sensor 802, and the exhaust pipe 803 is provided with a flow sensor 804. It also includes several cylinder branches connected to the cylinders and a cylinder main air circuit 805 connected to the cylinder branches.

[0056] The control system 900 includes an electromagnetic control valve 911, a flow control valve 912 and a pressure relief valve 913 arranged on the intake pipe 801, a main control valve 921 arranged on the cylinder main gas line, and a pressure reducing valve 922 and an electromagnetic valve 923 arranged on the cylinder branch line.

[0057] This embodiment also provides a fully automatic calibration method for a cryogenic gas cylinder safety valve, comprising the following steps:

[0058] S1. Install the safety valve to be calibrated into the safety valve receiving groove 211 of the material tray 210 and stack the material tray 210 on the material tray stacking rack 220;

[0059] S2. With the assistance of the tray lifting mechanism 240, the linear tray moving mechanism 260 moves the tray 210 at the bottom of the tray stacking rack 220 to the inspection placement area;

[0060] S3. The robotic arm 300 places the safety valve to be tested on the tray 210 in the test placement area into the test fixture 410 and clamps it with the clamping cylinder 420. The side-moving cylinder 430 drives the test fixture 410 to move to the bottom of the pressing cylinder 440 and presses it.

[0061] S4, the control system 900 controls the opening and closing of each valve to automatically complete the calibration work;

[0062] S5. The downward pressure cylinder 440 releases the safety valve to be tested, the side movement cylinder 430 drives the test fixture 410 back to the initial position, and the clamping cylinder 420 resets and releases the safety valve to be tested;

[0063] S6. The robot arm 300 sorts the inspected safety valves into a qualified product box 500 or a failed product box 700 according to the inspection results.

[0064] S7, repeat the above steps S3 to S6 until all the safety valves on the tray 210 in the inspection placement area are cleared;

[0065] S8. With the assistance of the empty tray lifting mechanism 250, the linear tray moving mechanism 260 moves the empty tray 210 to the empty tray stacking rack 230.

[0066] Step S4 is specifically as follows:

[0067] S41, close the pressure relief valve 913 and open the electromagnetic control valve 911 to allow air to flow into the safety valve to be tested;

[0068] S42, controlling the air intake of the flow control valve 912 to slowly increase the pressure;

[0069] S43, when the flow sensor 804 on the exhaust pipe 803 detects gas flow, the pressure value of the pressure sensor 802 is collected;

[0070] S44. Repeat the check at least 3 times;

[0071] S45, close the electromagnetic control valve 911 and open the pressure relief valve 913 to exhaust.

[0072] In the multi-station simultaneous automatic calibration method of the present invention, the data collected during the calibration process of each calibration station are recorded and saved in real time by the industrial control computer. Moreover, since multiple calibration stations can perform calibration work at the same time and there are sufficient calibration stations, each calibration station can repeat the calibration at least three times, and the values ​​recorded three times are compared. Firstly, errors can be eliminated, and secondly, the average value of the pressure can be taken as the set pressure of the safety valve to be calibrated, thereby ensuring the accuracy of the calibration.

[0073] The fully automatic calibration method for the safety valve of a cryogenic gas cylinder of the present invention realizes automatic loading and unloading of the safety valve calibration process through the robotic arm 300 and the control system 900. Before the calibration, the robotic arm 300 grabs the safety valve from the material tray 210 and places it in the test tool 410. After the calibration, the robotic arm 300 automatically sorts the safety valve into the qualified product box 500 or the unqualified product box 700. All processes including loading, clamping, calibration, and unloading are completed automatically without human participation, reducing manual labor, improving the utilization rate of calibration personnel, and effectively avoiding safety risks of calibration personnel. Moreover, the six clamping test mechanisms can operate simultaneously, greatly shortening the average calibration time of a single valve and improving calibration efficiency.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the scope of protection of the present invention.

Claims

1. A fully automatic calibration device for the safety valve of a cryogenic gas cylinder, characterized in that: The invention comprises a test bench (100), wherein a material feeding area to be tested, a test area and a material discharge area to be tested are arranged on the table of the test bench (100), wherein the test area is located between the material feeding area to be tested and the material discharge area to be tested, and an air circuit system (800) and a control system (900) are arranged inside the test bench (100); The feeding area to be inspected is provided with a loading assembly (200), and the loading assembly (200) comprises a tray stacking rack (220) and an empty tray stacking rack (230) arranged in the feeding area to be inspected, wherein a placement area to be inspected is provided between the tray stacking rack (220) and the empty tray stacking rack (230), the tray stacking rack (220) is used to stack trays (210) equipped with safety valves to be inspected, the placement area to be inspected is used to place trays (210) to be inspected, and the empty tray stacking rack (230) is used to stack empty trays (210), and the loading assembly (200) further comprises a tray lifting mechanism ( 240), an empty tray lifting mechanism (250) and a linear tray moving mechanism (260), wherein the tray lifting mechanism (240) is used to lift the tray (210) above the bottom layer of the tray stacking rack (220), the empty tray lifting mechanism (250) is used to lift the empty tray (210) above the bottom layer of the empty tray stacking rack (230), and the linear tray moving mechanism (260) is used to move the tray (210) at the bottom layer of the tray stacking rack (220) to the waiting inspection placement area, or to move the empty tray (210) in the waiting inspection placement area to the empty tray stacking rack (230); The verification area is provided with a mechanical arm (300) and a plurality of clamping test mechanisms (400), wherein the mechanical arm (300) is located in the middle of the plurality of clamping test mechanisms (400), and the mechanical arm (300) is used to grab the safety valve to be tested from the material tray (210) in the to-be-tested placement area and place it on the clamping test mechanism (400), or to remove the verified safety valve from the clamping test mechanism (400); the clamping test mechanism (400) includes a test fixture ( 410), two clamping cylinders (420), a side-moving cylinder (430) and a pressing cylinder (440), the test fixture (410) is used to install the safety valve to be tested, the two clamping cylinders (420) are distributed on both sides of the test fixture (410) and are used to clamp the safety valve to be tested, the side-moving cylinder (430) is used to move the test fixture (410) with the safety valve to be tested installed to the bottom of the pressing cylinder (440), and the pressing cylinder (440) is used to press the safety valve to be tested; The inspected material area is provided with a defective product box (500) and a qualified product box (700), wherein the defective product box (500) is located on one side of the surface of the inspected material area, and the qualified product box (700) is located on the other side of the surface of the inspected material area; The air circuit system (800) comprises a plurality of air intake pipes (801) and air exhaust pipes (803) connected to the clamping test mechanism, the other end of the air intake pipe (801) is connected to the air source, a pressure sensor (802) is provided on the air intake pipe (801), and a flow sensor (804) is provided on the air exhaust pipe (803); and also comprises a plurality of cylinder branches connected to the cylinders and a cylinder main air circuit (805) connected to the cylinder branches. The control system (900) comprises an electromagnetic control valve (911), a flow control valve (912) and a pressure relief valve (913) arranged on an intake pipe (801), a main control valve (921) arranged on a cylinder main gas path, a pressure reducing valve (922) and an electromagnetic valve (923) arranged on a cylinder branch path.

2. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 1, characterized in that: The surface of the material tray (210) is provided with a plurality of safety valve accommodating grooves (211) distributed in an array, and the safety valve accommodating grooves (211) are used to place the safety valves to be calibrated.

3. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 1 or 2, characterized in that: The tray lifting mechanism (240) comprises a tray lifting cylinder (241), a tray support plate (242) is fixed to the top end of the cylinder shaft of the tray lifting cylinder (241), and the tray support plate (242) is inserted between the tray (210) at the bottom layer and the second-to-last layer of the tray stacking frame.

4. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 3, characterized in that: The empty tray lifting mechanism (250) comprises an empty tray lifting cylinder (251), an empty tray supporting plate (252) is fixed to the top of the cylinder shaft of the empty tray lifting cylinder (251), and the empty tray supporting plate (252) is inserted between the empty tray (210) at the bottom layer and the empty tray (210) at the second to last layer of the empty tray stacking rack.

5. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 4, characterized in that: The linear tray moving mechanism (260) includes a linear cylinder (261), which is fixed away from the tray stacking rack (220). One end of the cylinder shaft of the linear cylinder (261) extends below the tray stacking rack (220). A vertical lifting cylinder (262) is fixed on the cylinder shaft. The vertical lifting cylinder (262) can move linearly with the extension and retraction of the cylinder shaft. A supporting plate (263) is fixed on the cylinder shaft of the vertical lifting cylinder (262).

6. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 1 or 2, characterized in that: The tray stacking rack (220) is composed of four first angle steel frames (221) fixed on the table, wherein two first angle steel frames (221) close to the inspection placement area are provided with tray outlets (222) for the material tray to be moved out, and the height of the tray outlets (222) is consistent with the height of the bottommost tray (210); the empty tray stacking rack (230) is composed of four second angle steel frames (231) fixed on the table, wherein two second angle steel frames (231) close to the inspection placement area are provided with empty tray inlets for the material tray to be moved in, and the height of the empty tray inlets is consistent with the height of the bottommost empty tray (210).

7. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 1, characterized in that: The test fixture (410) is installed on the movable seat (401), and the two clamping cylinders (420) are symmetrically arranged on both sides of the test fixture (410). A clamping block (421) is fixed on the cylinder shaft of the clamping cylinder (420), and a clamping groove (422) for clamping the safety valve to be tested is provided on the side of the clamping block (421) close to the test fixture (410); the side-shifting cylinder (430) is fixed on the side of the mounting seat (402), and the cylinder shaft of the side-shifting cylinder (430) passes through the mounting seat (402) and is connected to the movable block (403). The moving block (403) is fixed on the side of the cylinder shaft of the moving cylinder (430), and the other side of the moving block (403) is fixedly connected to the moving seat (401); a vertical plate (404) is fixed on the top of the mounting seat (402), a support plate (405) is fixed on one side of the upper part of the vertical plate (404), the downward pressing cylinder (440) is fixed on the support plate (405), and a through hole is opened on the support rod (405) for the cylinder shaft of the downward pressing cylinder (440) to pass through, and the downward pressing cylinder (440) and the test fixture (410) are located on the same side of the vertical plate (404).

8. The fully automatic calibration device for the safety valve of a cryogenic gas cylinder according to claim 1, characterized in that: The detected material area is also provided with a material unloading mechanism (600), which comprises two first fixed seats (601) fixed on the table, a first roller (602) is installed between the two first fixed seats (601), an extension plate (603) is hinged between the two fixed seats (601), one end of the extension plate (603) extends out of the table and is connected to the qualified product box (700), a second roller (604) is fixed on the qualified product box (700), and a conveyor belt (605) is provided between the first roller (602) and the second roller (604).

9. A fully automatic calibration method for a cryogenic gas cylinder safety valve, characterized in that: The verification device according to any one of claims 1 to 8 comprises the following steps: S1. Install the safety valve to be calibrated into the safety valve receiving groove of the material tray and stack the material tray on the material tray stacking rack; S2. With the assistance of the tray lifting mechanism, the linear tray moving mechanism moves the tray at the bottom of the tray stacking rack to the inspection placement area; S3, the robot arm places the safety valve to be tested on the tray in the test placement area into the test fixture and is clamped by the clamping cylinder. The side-moving cylinder drives the test fixture to move to the bottom of the pressing cylinder and presses it; S4, control system automatically completes the calibration work; S5, the downward pressure cylinder releases the safety valve to be tested, the side-moving cylinder drives the test fixture back to the initial position, and the clamping cylinder resets to release the safety valve to be tested; S6. The robot arm sorts the inspected safety valves into qualified product boxes or unqualified product boxes according to the inspection results; S7, repeat the above S3 to S6 operations until all the safety valves on the trays in the inspection placement area are emptied; S8. With the assistance of the empty tray lifting mechanism, the linear tray moving mechanism moves the empty tray to the empty tray stacking rack.

10. The fully automatic calibration method for the safety valve of a cryogenic gas cylinder according to claim 9, characterized in that: Step S4 is specifically as follows: S41, close the pressure relief valve and open the electromagnetic control valve to allow air to flow into the safety valve to be tested; S42, controlling the air intake of the flow control valve to slowly increase the pressure; S43, when the flow sensor on the exhaust pipe measures that there is gas flow, collecting the pressure value of the pressure sensor; S44, repeat the check at least 3 times; S45. Close the solenoid control valve and open the pressure relief valve to exhaust air.

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