A safety valve pressure regulation test method

Abstract

The present invention provides a safety valve pressure regulation test method, comprising the following steps: inputting a target opening pressure value; inserting a liquid inlet end of the safety valve to be tested into the valve mounting hole, and automatically locking the radial position and axial position of the safety valve; controlling the hydraulic system to supply low-pressure test fluid to the safety valve, and checking whether the product clamping is in place; controlling the hydraulic system to gradually increase the liquid supply pressure, and obtaining an actual opening pressure value; comparing the actual opening pressure value with the target opening pressure value, and tightening or loosening the pressure regulating screw on the safety valve according to the comparison result; if the actual opening pressure value still fails to meet the standard and exceeds the set adjustment number threshold, it is judged as a defective product; if the actual opening pressure value meets the standard, supplying low-pressure test fluid to the safety valve again to test the low-pressure sealing performance; supplying high-pressure test fluid to test the high-pressure sealing performance, removing water, and a marking machine to fill information on the safety valve after the test.

Description

Technical Field

[0001] The present invention relates to the field of safety valve testing, and in particular to a safety valve pressure regulation testing method. Background Art

[0002] A safety valve is a special valve whose opening and closing parts are normally closed under the action of external force. When the medium pressure in the equipment or pipeline rises above the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. It is mainly used in pressure vessels such as boilers and hydraulic systems to control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation.

[0003] In the existing technology, some safety valves are tested using automated equipment. For example, Patent 201810785464.6 provides an automatic testing system for safety valves. The safety valves are loaded and unloaded through a linear conveying device, and the safety valves are grasped by a robot and transferred between various workstations, thereby realizing the automatic testing function of the safety valves. However, the device can only detect the air tightness of the safety valves, has a single function, and cannot meet complex needs.

[0004] Unlike ordinary safety valves, the safety valves used in hydraulic supports need to adjust their opening pressure according to customer requirements, which is usually set between 35MPa and 50MPa. The pressure is adjusted by turning the pressure regulating screw on the top of the safety valve. At the same time, according to national standards, high-pressure sealing and low-pressure sealing also need to be tested. Since both pressure adjustment and testing are required, the operation and control requirements are relatively high. At present, the testing of this type of safety valve can only be done manually. Due to the small size and large number of safety valves, manual testing is very labor-intensive and the testing efficiency is very low.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0006] The purpose of the present invention is to address the deficiencies in the prior art and thereby provide a safety valve pressure regulating and testing method which is scientifically designed, can both regulate pressure and perform testing, has high testing efficiency and is highly practical.

[0007] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a safety valve pressure regulation test method, the test platform used includes a machine platform, a lifting mechanism arranged on the machine platform, a clamping mechanism, an air drying mechanism, a hydraulic system, and a tightening mechanism driven to rise and fall by the lifting mechanism;

[0008] The clamping mechanism includes a valve seat, a clamping mechanism mounted on the valve seat, and a limit mechanism. The valve seat is provided with a valve mounting hole. A liquid inlet interface is connected below the valve mounting hole. The hydraulic system provides test fluid to the liquid inlet interface through a pipeline. A pressure sensor is provided on the pipeline. The clamping mechanism includes an opening and closing drive mechanism and two clamping jaws. The two clamping jaws are symmetrically arranged on both sides of the central axis of the valve mounting hole. The opening and closing drive mechanism drives the two clamping jaws to move closer or farther away synchronously.

[0009] The limiting mechanism includes a push-pull drive mechanism and a limiting block. A telescopic groove is provided on the valve seat corresponding to the limiting block. The push-pull drive mechanism drives the limiting block to extend and retract along the telescopic groove, so that the limiting end of the limiting block defines or unlocks the axial position of the safety valve.

[0010] The valve mounting hole is located directly below the tightening mechanism, which includes a servo motor and a screwdriver driven to rotate by the servo motor, and the tightness of the screw of the safety valve is adjusted by rotating the screwdriver;

[0011] The safety valve pressure regulating test method comprises the following steps:

[0012] S1. Input the target opening pressure value into the control system according to the required opening pressure;

[0013] S2. Insert the liquid inlet end of the safety valve to be tested into the valve mounting hole. The opening and closing drive mechanism drives the two clamping jaws to clamp the safety valve, automatically locking the radial position of the safety valve. The push-pull drive mechanism drives the limiting end of the limit block to insert into the annular groove of the liquid inlet end of the safety valve, automatically locking the axial position of the safety valve.

[0014] S3, the control system controls the hydraulic system to supply low-pressure test fluid to the safety valve and maintain the pressure for a period of time. If the pressure maintaining state is good, the process proceeds to step S4. If the pressure maintaining state is not good, the product is judged to be unqualified and the process proceeds to step S13.

[0015] S4. The control system controls the hydraulic system to gradually increase the fluid supply pressure until the safety valve opens, and obtains an actual opening pressure value according to a pressure relief characteristic curve collected by a pressure sensor;

[0016] S5. The control system compares the actual opening pressure value with the target opening pressure value. If the actual opening pressure value meets the threshold range set by the target opening pressure value, the process proceeds to step S8. If the actual opening pressure value exceeds the threshold range set by the target opening pressure value, the process proceeds to step S6.

[0017] S6. If the actual opening pressure value is lower than the threshold range set by the target opening pressure value, the servo motor controls the screwdriver to tighten the pressure regulating screw on the safety valve; if the actual opening pressure value is higher than the threshold range set by the target opening pressure value, the servo motor controls the screwdriver to loosen the pressure regulating screw on the safety valve;

[0018] S7, repeat steps S4-S6. During the adjustment period, if the set adjustment number threshold is exceeded and the actual opening pressure value still cannot meet the threshold range set for the target opening pressure value, it is judged as a defective product and the process goes to step S13;

[0019] S8. The control system controls the hydraulic system again to supply low-pressure test fluid to the safety valve, maintains the pressure for a period of time, and tests the low-pressure sealing performance. If the low-pressure sealing performance is good, the process proceeds to step S9. If the low-pressure sealing performance is poor, the product is judged as unqualified and the process proceeds to step S13.

[0020] S9, the control system controls the hydraulic system to gradually increase the liquid supply pressure to 90% of the target opening pressure value, maintains the pressure for a period of time, and tests the high-pressure sealing performance. If the high-pressure sealing performance is good, the process proceeds to step S10; if the high-pressure sealing performance is poor, the product is judged to be unqualified and the process proceeds to step S13;

[0021] S10, using the air-drying mechanism to remove water from the safety valve;

[0022] S11. The control system controls the marking machine to fill information on the safety valve after the test;

[0023] S12. Place the test product in the qualified product area;

[0024] S13. Place the test product in the unqualified product area;

[0025] S14. Execute steps S2-S13 in a loop.

[0026] Based on the above, in step S3 and step S8, the liquid supply pressure is 2-3 MPa; in step S3, step S8 and step S9, the pressure holding time is 2 minutes.

[0027] Based on the above, in step S5, when the target opening pressure value is ≤40 MPa, the threshold range is ±0.5 MPa; when the target opening pressure value is >40 MPa, the threshold range is ±1.5% of the target opening pressure value.

[0028] Based on the above, in step S7, the adjustment times threshold is 3-5 times.

[0029] Based on the above, the safety valve testing equipment it uses includes at least one material cart, a material cart docking station, a transfer robot, the test platform, the marking machine, the logistics line and the control system. The material cart docking station is used to locate the loading position of the material cart, the transfer robot controls the transfer of the safety valve in each step, and the control system controls the transfer robot to transfer the safety valve, the test platform to test the safety valve and the transmission of the logistics line.

[0030] Based on the above, the transfer robot is a six-axis articulated robot.

[0031] Based on the above, the logistics line is a belt conveyor, which is divided into a qualified product area and an unqualified product area. Safety valves that pass the test are placed in the qualified product area for output, and safety valves that fail the test are placed in the unqualified product area for output.

[0032] Based on the above, the limiting end of the limiting block is provided with two clamping shafts, and the two clamping shafts are used to be inserted into the two sides of the annular groove on the liquid inlet end of the safety valve.

[0033] Compared with the prior art, the present invention has outstanding substantive features and significant progress. Specifically, the present invention inserts the safety valve to be tested into the valve mounting hole, which can realize automatic communication with the liquid inlet pipeline. The clamping mechanism clamps both sides of the safety valve to automatically lock the radial position of the safety valve. The limiting mechanism is inserted into the annular groove of the liquid inlet end of the safety valve to automatically lock the axial position of the safety valve, so that the screwdriver can be accurately aligned with the pressure regulating screw on the safety valve. During the pressure regulation test, the target opening pressure value is input into the control system, and the actual pressure is measured according to the pressure relief characteristic curve of the pressure sensor. The actual opening pressure value is compared with the target opening pressure value, and the tightening mechanism is controlled to tighten or loosen the pressure regulating screw on the safety valve until the actual opening pressure value meets the threshold range set by the target opening pressure value, which means that the pressure regulation is completed. If it does not meet the standard, repeat S4-S6 and re-regulate the pressure test until it meets the standard or it still does not meet the standard after a certain number of times, and it is judged as an unqualified product. Then the low-pressure sealing and high-pressure sealing of the safety valve are tested, and finally water removal, information filling and product output are carried out to realize automatic pressure regulation and testing of the safety valve. The system has the advantages of scientific design, pressure regulation and testing, high testing efficiency and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a top view of the safety valve testing device of the present invention.

[0035] Figure 2 It is a three-dimensional diagram of the safety valve testing device of the present invention.

[0036] Figure 3 It is a structural diagram of the material vehicle in the present invention.

[0037] Figure 4 It is a structural schematic diagram of the material storage rack in the present invention.

[0038] Figure 5 It is a structural diagram of the test platform in the present invention.

[0039] Figure 6 It is a structural schematic diagram of the clamping mechanism in the present invention.

[0040] Figure 7 It is a structural schematic diagram of the clamping mechanism in the present invention.

[0041] Figure 8 It is a structural diagram of the limiting mechanism in the present invention.

[0042] Figure 9 It is a structural diagram of the main operating part of the test platform in the present invention.

[0043] Figure 10 It is a structural diagram of the limiting mechanism in the present invention.

[0044] In the figure: 1. Material cart; 2. Protective enclosure; 3. Material cart docking station; 4. Transfer robot; 5. Test platform; 6. Logistics line; 7. Marking machine; 8. Display system; 9. Control system; 10. Loading door; 11. Storage rack; 12. Material placement hole; 13. Machine platform; 14. Lifting mechanism; 15. Tightening mechanism; 16. Clamping mechanism; 17. Air drying mechanism; 18. Hydraulic system; 19. Valve seat; 20. Valve mounting hole; 21. Double-head cylinder; 22. Gripper; 23. Limit block; 24. Telescopic slot; 25. Clamping shaft; 26. End plate; 27. Push-pull cylinder; 28. Servo motor; 29. Screwdriver; 30. Safety valve; 31. Liquid inlet interface; 32. Ring groove. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0046] Example 1

[0047] like Figure 1-10 A safety valve testing device includes a protective fence 2, two material carts 1, a material cart docking station 3, a transfer robot 4, a test platform 5, a marking machine 7, a logistics line 6 and a control system 9. The material cart docking station 3 is used to locate the loading position of the material cart 1, the transfer robot 4 controls the transfer of the safety valve 30 between various devices, and the control system 9 controls the transfer of the safety valve 30 by the transfer robot 4, the testing platform 5 to test the safety valve 30 and the transmission of the logistics line 6.

[0048] Among them, the transfer manipulator 4 is specifically a six-axis articulated robot, the material cart 1 can be either a manual material cart or an AGV material cart. When it is an AGV material cart, it can realize automatic loading and unloading, further improving the degree of automation. The logistics line 6 is specifically a belt conveyor, and the logistics line 6 is divided into qualified product areas and unqualified product areas (for example, divided by the central axis) so that the products can be placed in the corresponding areas according to the test results.

[0049] The protective enclosure 2 is provided with a loading door opening 10 corresponding to the material cart 1. The material cart docking station 3, the transfer robot 4 and the test platform 5 are arranged in the protective enclosure 2. The material cart 1 passes through the loading door opening 10 and docks with the material cart docking station 3. The input end of the logistics line 6 is provided in the protective enclosure 2 and the output end is provided outside the protective enclosure 2. A storage rack 11 is provided on the material cart 1. A plurality of material placement holes 12 are provided on the storage rack 11. The material placement holes 12 are used to place safety valves 30.

[0050] The testing platform 5 includes a machine platform 13 , a lifting mechanism 14 disposed on the machine platform 13 , a clamping mechanism 16 , an air-drying mechanism 17 , a hydraulic system 18 , and a tightening mechanism 15 driven to rise and fall by the lifting mechanism 14 .

[0051] The clamping mechanism 16 includes a valve seat 19, a clamping mechanism and a limiting mechanism installed on the valve seat 19, a valve mounting hole 20 is opened on the valve seat 19, and a liquid inlet interface 31 is connected below the valve mounting hole 20. The hydraulic system 18 provides test fluid to the liquid inlet interface 31 through a pipeline, and a pressure sensor is provided on the pipeline. The clamping mechanism includes an opening and closing drive mechanism and two clamping jaws 22, and the two clamping jaws 22 are symmetrically arranged on both sides of the central axis of the valve mounting hole 20. The opening and closing drive mechanism specifically adopts a double-headed cylinder 21, and the opening and closing drive mechanism drives the two clamping jaws 22 to move closer or farther away synchronously; The limiting mechanism includes a push-pull drive mechanism and a limit block 23. A telescopic groove 24 is provided on the valve seat 19 corresponding to the limit block 23. Two clamping shafts 25 are provided at the limiting end of the limit block 23. The push-pull drive mechanism drives the limit block 23 to extend and retract along the telescopic groove 24. The two clamping shafts 25 are used to insert into the two sides of the annular groove 32 on the liquid inlet end of the safety valve 30 to limit or unlock the axial position of the safety valve 30. The push-pull drive mechanism specifically includes an end plate 26 and two push-pull cylinders 27. The center of the end plate 26 is connected to the driving end of the limit block 23. The two push-pull cylinders 27 are provided at both ends of the end plate 26 to keep the drive smooth.

[0052] The valve mounting hole 20 is located directly below the tightening mechanism 15 . The tightening mechanism 15 includes a servo motor 28 and a screwdriver 29 driven to rotate by the servo motor 28 . The tightness of the screw of the safety valve 30 is adjusted by rotating the screwdriver 29 .

[0053] Example 2

[0054] A safety valve pressure regulation test method, using the safety valve test equipment in Example 1 to perform a pressure regulation test, includes the following steps:

[0055] S1. Input the target opening pressure value to the control system 9 according to the required opening pressure;

[0056] S2. Insert the liquid inlet end of the safety valve 30 to be tested into the valve mounting hole 20. The opening and closing drive mechanism drives the two clamping jaws 22 to clamp the safety valve 30, automatically locking the radial position of the safety valve 30. The push-pull drive mechanism drives the limiting end of the limiting block 23 to insert into the annular groove 32 of the liquid inlet end of the safety valve 30, automatically locking the axial position of the safety valve 30.

[0057] S3, the control system 9 controls the hydraulic system 18 to supply low-pressure test fluid to the safety valve 30, maintaining the pressure for a period of time. If the pressure maintaining state is good, the process proceeds to step S4. If the pressure maintaining state is not good, the product is judged as unqualified and the process proceeds to step S13. This step can also identify whether the safety valve 30 is clamped in place.

[0058] S4, the control system 9 controls the hydraulic system 18 to gradually increase the hydraulic pressure until the safety valve 30 opens, and obtains the actual opening pressure value according to the pressure relief characteristic curve collected by the pressure sensor;

[0059] S5, the control system 9 compares the actual opening pressure value with the target opening pressure value. If the actual opening pressure value meets the threshold range set by the target opening pressure value, the process proceeds to step S8; if the actual opening pressure value exceeds the threshold range set by the target opening pressure value, the process proceeds to step S6;

[0060] S6. If the actual opening pressure value is lower than the threshold range set by the target opening pressure value, the servo motor 28 controls the screwdriver 29 to tighten the pressure-regulating screw on the safety valve 30. If the actual opening pressure value is higher than the threshold range set by the target opening pressure value, the servo motor 28 controls the screwdriver 29 to loosen the pressure-regulating screw on the safety valve 30.

[0061] S7, repeat steps S4-S6. During the adjustment period, if the set adjustment number threshold is exceeded and the actual opening pressure value still cannot meet the threshold range set for the target opening pressure value, it is judged as a defective product and the process goes to step S13;

[0062] S8, the control system 9 controls the hydraulic system 18 to supply low-pressure test fluid to the safety valve 30 again, maintains the pressure for a period of time, and tests the low-pressure sealing performance. If the low-pressure sealing performance is good, the process proceeds to step S9; if the low-pressure sealing performance is poor, the product is judged as unqualified and the process proceeds to step S13;

[0063] S9, the control system 9 controls the hydraulic system 18 to gradually increase the liquid supply pressure to 90% of the target opening pressure value, maintains the pressure for a period of time, and tests the high-pressure sealing performance. If the high-pressure sealing performance is good, the process proceeds to step S10; if the high-pressure sealing performance is poor, the product is judged as unqualified and the process proceeds to step S13;

[0064] S10, using the air-drying mechanism 17 to remove water from the safety valve 30;

[0065] S11, the control system 9 controls the marking machine 7 to fill the safety valve 30 with information after the test;

[0066] S12. Place the test product in the qualified product area;

[0067] S13. Place the test product in the unqualified product area;

[0068] S14, looping through steps S2-S13 to achieve automatic pressure regulation and testing of the safety valve 30.

[0069] Among them, in step S3 and step S8, the liquid supply pressure is 2-3 MPa; in step S3, step S8 and step S9, the pressure holding time can be adjusted in the control system 9, and the pressure holding time in this embodiment is 2 minutes; in step S5, when the target opening pressure value is ≤40 MPa, the threshold range is ±0.5 MPa, and when the target opening pressure value is >40 MPa, the threshold range is ±1.5% of the target opening pressure; in step S7, the adjustment number threshold is 3-5 times.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention. They should all be included in the scope of the technical solution for protection of the present invention.

Claims

1. A safety valve pressure regulation test method, characterized in that: The test platform used includes a machine platform, a lifting mechanism arranged on the machine platform, a clamping mechanism, an air drying mechanism, a hydraulic system, and a tightening mechanism driven to rise and fall by the lifting mechanism; The clamping mechanism includes a valve seat, a clamping mechanism mounted on the valve seat, and a limit mechanism. The valve seat is provided with a valve mounting hole. A liquid inlet interface is connected below the valve mounting hole. The hydraulic system provides test fluid to the liquid inlet interface through a pipeline. A pressure sensor is provided on the pipeline. The clamping mechanism includes an opening and closing drive mechanism and two clamping jaws. The two clamping jaws are symmetrically arranged on both sides of the central axis of the valve mounting hole. The opening and closing drive mechanism drives the two clamping jaws to move closer or farther away synchronously. The limiting mechanism includes a push-pull drive mechanism and a limiting block. A telescopic groove is provided on the valve seat corresponding to the limiting block. The push-pull drive mechanism drives the limiting block to extend and retract along the telescopic groove, so that the limiting end of the limiting block defines or unlocks the axial position of the safety valve. The valve mounting hole is located directly below the tightening mechanism, which includes a servo motor and a screwdriver driven to rotate by the servo motor, and the tightness of the screw of the safety valve is adjusted by rotating the screwdriver; The safety valve pressure regulating test method comprises the following steps: S1. Input the target opening pressure value into the control system according to the required opening pressure; S2. Insert the liquid inlet end of the safety valve to be tested into the valve mounting hole. The opening and closing drive mechanism drives the two clamping jaws to clamp the safety valve, automatically locking the radial position of the safety valve. The push-pull drive mechanism drives the limiting end of the limit block to insert into the annular groove of the liquid inlet end of the safety valve, automatically locking the axial position of the safety valve. S3, the control system controls the hydraulic system to supply low-pressure test fluid to the safety valve and maintain the pressure for a period of time. If the pressure maintaining state is good, the process proceeds to step S4. If the pressure maintaining state is not good, the product is judged to be unqualified and the process proceeds to step S13. S4. The control system controls the hydraulic system to gradually increase the fluid supply pressure until the safety valve opens, and obtains an actual opening pressure value according to a pressure relief characteristic curve collected by a pressure sensor; S5. The control system compares the actual opening pressure value with the target opening pressure value. If the actual opening pressure value meets the threshold range set by the target opening pressure value, the process proceeds to step S8. If the actual opening pressure value exceeds the threshold range set by the target opening pressure value, the process proceeds to step S6. S6. If the actual opening pressure value is lower than the threshold range set by the target opening pressure value, the servo motor controls the screwdriver to tighten the pressure regulating screw on the safety valve; if the actual opening pressure value is higher than the threshold range set by the target opening pressure value, the servo motor controls the screwdriver to loosen the pressure regulating screw on the safety valve; S7, repeat steps S4-S6. During the adjustment period, if the set adjustment number threshold is exceeded and the actual opening pressure value still cannot meet the threshold range set for the target opening pressure value, it is judged as a defective product and the process goes to step S13; S8. The control system controls the hydraulic system again to supply low-pressure test fluid to the safety valve, maintains the pressure for a period of time, and tests the low-pressure sealing performance. If the low-pressure sealing performance is good, the process proceeds to step S9. If the low-pressure sealing performance is poor, the product is judged as unqualified and the process proceeds to step S13. S9, the control system controls the hydraulic system to gradually increase the liquid supply pressure to 90% of the target opening pressure value, maintains the pressure for a period of time, and tests the high-pressure sealing performance. If the high-pressure sealing performance is good, the process proceeds to step S10; if the high-pressure sealing performance is poor, the product is judged to be unqualified and the process proceeds to step S13; S10, using the air-drying mechanism to remove water from the safety valve; S11. The control system controls the marking machine to fill information on the safety valve after the test; S12. Place the test product in the qualified product area; S13. Place the test product in the unqualified product area; S14. Execute steps S2-S13 in a loop.

2. The safety valve pressure regulation test method according to claim 1, characterized in that: In step S3 and step S8, the liquid supply pressure is 2-3 MPa; in step S3, step S8 and step S9, the pressure holding time is 2 minutes.

3. The safety valve pressure regulation test method according to claim 2, characterized in that: In step S5 , when the target opening pressure value is ≤40 MPa, the threshold range is ±0.5 MPa; when the target opening pressure value is greater than 40 MPa, the threshold range is ±1.5% of the target opening pressure value.

4. The safety valve pressure regulation test method according to claim 3, characterized in that: In step S7, the adjustment times threshold is 3-5 times.

5. The safety valve pressure regulation test method according to any one of claims 1 to 4, characterized in that: The safety valve testing equipment used includes at least one material cart, a material cart docking station, a transfer robot, the test platform, the marking machine, a logistics line and the control system. The material cart docking station is used to locate the loading position of the material cart, the transfer robot controls the transfer of the safety valve in each step, and the control system controls the transfer robot to transfer the safety valve, the test platform to test the safety valve and the transmission of the logistics line.

6. The safety valve pressure regulation test method according to claim 5, characterized in that: The transfer manipulator is a six-axis joint robot.

7. The safety valve pressure regulation test method according to claim 6, characterized in that: The logistics line is a belt conveyor, which is divided into a qualified product area and an unqualified product area. Safety valves that pass the test are placed in the qualified product area for output, and safety valves that fail the test are placed in the unqualified product area for output.

8. The safety valve pressure regulation test method according to any one of claims 1, 2, 3, 4, 6 and 7, characterized in that: The limiting end of the limiting block is provided with two clamping shafts, and the two clamping shafts are used to be inserted into two sides of the annular groove on the liquid inlet end of the safety valve.

Images