CN114062247A - Off-line measuring device for friction force of piston of pilot type safety valve control cabinet - Google Patents
Off-line measuring device for friction force of piston of pilot type safety valve control cabinet Download PDFInfo
- Publication number
- CN114062247A CN114062247A CN202111191823.3A CN202111191823A CN114062247A CN 114062247 A CN114062247 A CN 114062247A CN 202111191823 A CN202111191823 A CN 202111191823A CN 114062247 A CN114062247 A CN 114062247A
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- piston
- fixing plate
- friction force
- safety valve
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 description 3
- 230000004807 localization Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Automation & Control Theory (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention belongs to the field of nuclear power, and particularly relates to an off-line measuring device for friction force of a piston of a pilot-operated safety valve control cabinet. Comprises a test platform and a fixing plate; the first fixing plate is fixed on the test platform, the piston sleeve is arranged in the middle of the first fixing plate, and the piston sleeve is connected with a piston and a seal; the second fixing plate is matched with the guide rail and can slide along the guide rail, the pull/pressure sensor is connected with the micro motor, and the pull/pressure sensor is connected with the piston and the seal; the pull/pressure sensor, the first limit switch, the second limit switch, the micro motor and the laser displacement sensor are respectively connected with the control system. The beneficial effects are that: the friction force of the piston of the pilot operated safety valve in an off-line state can be measured, the friction force can be visually obtained, the friction force is compared with a pressure fixed value, the standard of the friction force is formulated, and a basis is provided for piston sealing and whether the piston needs to be replaced.
Description
Technical Field
The invention belongs to the field of nuclear power, and particularly relates to an off-line measuring device for friction force of a piston of a pilot-operated safety valve control cabinet.
Background
The safety valve of the pressure stabilizer is used as a loop pressure boundary of a pressurized water reactor nuclear power plant, has important functions of sealing main coolant and preventing overpressure of a system, and therefore the valve is normally opened and closed according to a pressure fixed value, and plays a vital role in keeping the pressure of the loop.
The system pressure overcomes the spring force and depends on a piston and a transmission rod of the control cabinet to respectively open or close the two paths of flow dividers, and the pressure of the valve head is released and established, so that the valve is opened or closed. The opening and closing fixed value setting is set by a spring, so theoretically, the system pressure for opening and closing the valve is consistent with the spring force setting, but the sealing friction force of the piston offsets a part of the system pressure, and the pressure fixed value is greatly influenced.
Because the structure influence, the valve pressure is opened and is closed the definite value difference certain, increase and decrease simultaneously promptly, if frictional force is too big, lead to the valve actually to open and close the difference too big, surpass standard range, need change the piston seal, restore the piston cover simultaneously, it is very big to change the risk that leads to leaking on line. The friction force of the piston seal is measured by the control cabinet piston friction force off-line measuring device, so that the performance of the piston seal is judged, whether the piston seal is replaced or not is determined, and the piston sleeve is repaired. Meanwhile, a test device is provided for localization of piston sealing, and the difference from the original sealing is judged.
At present, the measures are taken, when disassembly and maintenance are carried out on site, the piston and the sealing part are assembled, the piston is manually pushed in a reciprocating manner, the friction force is judged according to the experience of a maintenance responsible person, proper grinding treatment is carried out, the friction force is moderate, the reliability completely depends on the experience of the maintenance responsible person, no specific quantitative value exists, and misjudgment is easily caused.
And after the control cabinet is assembled, performing primary pressure setting, testing opening and closing pressure fixed values, and if the opening and closing pressure fixed values are within a qualified range, determining that the sealing friction force of the piston is qualified. If the difference value of the opening pressure and the closing pressure exceeds the range, the piston seal needs to be replaced and the piston seal sleeve needs to be repaired on line, the position of the seal gasket cannot be observed in the process of reloading, and the risk of leakage exists.
Disclosure of Invention
The invention aims to provide an off-line measuring device for the friction force of a piston of a pilot operated safety valve control cabinet, aiming at solving the problem that the friction force of the piston of the pilot operated safety valve control cabinet cannot be quantitatively measured.
The technical scheme of the invention is as follows: a kind of pilot-operated type safe valve control cabinet piston friction force off-line measuring device, including test platform, first dead plate, second dead plate and pulling/pressure sensor; the first fixing plate is fixed on the test platform, the piston sleeve is arranged in the middle of the first fixing plate, and the piston sleeve is connected with a piston and a seal; a guide rail is fixed on the test platform positioned on one side of the first fixing plate, the second fixing plate is matched with the guide rail and can slide along the guide rail, the pull/pressure sensor is connected with the micro motor, and the pull/pressure sensor is connected with the piston and in a sealing way; the pull/pressure sensor is connected with the control system, the first limit switch and the second limit switch are respectively connected with the control system, the micro motor is connected with the control system, and the laser displacement sensor is connected with the control system.
The first fixing plate is fixed on the test platform through a bolt, the piston sleeve is installed in the middle of the first fixing plate, a protection gasket is installed between the piston sleeve and the first fixing plate, and the piston sleeve is connected with a piston and a seal.
The first fixing plate and the second fixing plate are L-shaped.
The middle of the second fixing plate is provided with a round hole.
The pull/pressure sensor is connected with the micro motor in a threaded mode through a second connecting rod, and the inner thread of the second connecting rod is connected with the outer thread of the pull/pressure sensor.
The pull/pressure sensor is connected with the piston and the sealing part through a first connecting rod, the external thread of the first connecting rod is connected with the internal bolt at the top of the piston, and the pressure or the pulling force of the motor is transmitted to the piston.
The pull/pressure sensor is connected with the control system through a first lead.
The first limit switch and the second limit switch are respectively connected with the control system through a second lead and a third lead.
And the test platform is provided with a corresponding bracket for fixing the first limit switch and the second limit switch.
The micro motor is connected with the control system through a fourth lead.
The invention has the beneficial effects that: the friction force of the piston of the pilot operated safety valve in an off-line state can be measured, the friction force can be visually obtained, the friction force is compared with a pressure fixed value, the standard of the friction force is formulated, and a basis is provided for piston sealing and whether the piston needs to be replaced. Meanwhile, in the implementation process of the localization project, the formed product is tested and measured, and compared with original factory spare parts, the effect of the localization spare parts is evaluated.
Drawings
Fig. 1 is a schematic structural view of an off-line measurement device for friction force of a piston of a pilot-operated safety valve control cabinet according to the present invention.
In the figure: the device comprises a piston sleeve 1, a first fixing plate 2, a piston and a seal 3, a first connecting rod 4, a second fixing plate 5, a pull/pressure sensor 6, a first lead 7, a second lead 8, a third lead 9, a first limit switch 10, a second limit switch 11, a second connecting rod 12, a second limit rod 13, a micromotor 14, a fourth lead 15, a guide rail 16, a control system 17, a fifth lead 18, a test platform 19 and a laser displacement sensor 20.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The utility model provides a guide's formula safety valve switch cubicle piston frictional force off-line measuring device, includes piston bush 1, first fixed plate 2, piston and sealed 3, head rod 4, second fixed plate 5, draw/pressure sensor 6, first wire 7, second wire 8, third wire 9, first limit switch 10, second limit switch 11, second connecting rod 12, second gag lever post 13, micro-motor 14, fourth wire 15, guide rail 16, control system 17, fifth wire 18, test platform 19 and laser displacement sensor 20.
As shown in fig. 1, an L-shaped first fixing plate 2 is fixed on a test platform 19 through bolts, a piston sleeve 1 is mounted in the middle of the first fixing plate 2, a protective gasket is mounted between the piston sleeve 1 and the first fixing plate, and the piston sleeve 1 is connected with a piston and a seal 3 to fasten the piston sleeve; a guide rail 16 is fixed on the test platform 19 positioned at one side of the first fixing plate 2, the L-shaped second fixing plate 5 is matched with the guide rail 16 and can slide along the guide rail 16, and a round hole is formed in the middle of the second fixing plate 5; the pull/pressure sensor 6 is connected with the micro motor 14 in a threaded mode through a second connecting rod 12, the internal thread of the second connecting rod 12 is connected with the external thread of the pull/pressure sensor 6, the pull/pressure sensor 6 is connected with the piston and the seal 3 through a first connecting rod 4, the external thread of the first connecting rod 4 is connected with an internal bolt at the top of the piston, and the pressure or the pulling force of the motor is transmitted to the piston; the pull/pressure sensor 6 is connected with the control system 17 through a first lead 7, the first limit switch 10 and the second limit switch 11 are respectively connected with the control system 17 through a second lead 8 and a third lead 9, corresponding supports are installed on the test platform 19 and used for fixing the first limit switch 10 and the second limit switch 11, generated signals are transmitted to the control system 17 through leads, and the motor is started and stopped by triggering the instrument control limit device. The micromotor 14 is connected with the control system 17 through a fourth lead 15, and the laser displacement sensor 20 is connected with the control system 17 through a fifth lead 18. And a laser displacement sensor 20 is arranged on the other side of the piston fixing device, the laser displacement sensor 20 is fixed on the test platform 19 through a support and a fixing bolt and used for measuring the displacement of the piston, converting the signal into an electric signal and transmitting the electric signal to the control system 17 through a lead to obtain a displacement and time curve and judge the motion state and the corresponding acceleration of the piston. And stopping the motor after the displacement reaches a specified value. The control system 17 sends a starting signal of the micro motor 14 to start the micro motor 14, collects signals of the laser displacement sensor 20, records displacement and time, calculates the moving speed of the piston, calculates the magnitude of a motor control signal according to the moving speed, and controls the running speed of the micro motor 14 to ensure that the piston and the seal 3 keep moving at a constant speed. According to the set displacement, after the motor is stopped, the micro motor 14 is controlled to rotate reversely, the piston and the seal 3 return, and when a signal of the second limit rod 13 is collected, the micro motor 14 is controlled to stop.
The installation and adjustment process of the invention is as follows:
(1) the first fixing plate 2 is fixed on the test platform 19 by using bolts;
(2) the piston and the seal 3 are mounted into the piston sleeve 1;
(3) the piston sleeve 1 is arranged on the first fixing plate 2, the second fixing plate 5 moves along the guide rail 16, gaskets are additionally arranged on the piston sleeve 1 and the second fixing plate 5, and the piston sleeve 1 and the second fixing plate 5 are connected and fastened by using bolts;
(4) the first connecting rod 4 is connected with the piston 3 through threads, and the first connecting rod 4 is connected with the pull/pressure sensor 6 through threads;
(5) the second connecting rod 12 is connected with the pull/pressure sensor 6 through threads, and the second connecting rod 12 is connected with the shaft of the micro motor 14 through a valve rod nut;
(6) the second limiting rod 13 is fixed with the second connecting rod 12 in a double semi-ring fixing mode;
(7) the first limit switch 10, the second limit switch 11 and the micro motor 14 are fixed on the test platform 19 through a bracket and a bolt; the micromotor 14 is connected by an additional power cable;
(8) the pull/pressure sensor 6 is connected to a control system 17 through a first lead 7, a first limit switch 10 through a second lead 8, and a second limit switch 11 through a third lead 9;
(9) the control system 17 sends a control signal to the micromotor 14 through the fourth conductor 15;
(10) the laser displacement sensor 20 measures the displacement of the piston 3, converts the displacement into an electric signal and transmits the electric signal to the control system 17 through a fifth lead 18; the laser displacement sensor 20 is connected to the test platform 19 by a bracket and a bolt.
And (3) testing:
(1) adjusting the positions of the piston and seal 3, the first limit switch 10, the second limit switch 11 and the laser displacement sensor 20, wherein the total stroke is 4 mm;
(2) the control system 17 sends a start signal to the micromotor 14;
(3) the micromotor 14 pushes the second connecting rod 12, the pull/pressure sensor 6, the first connecting rod 4 and the shaft system of the piston and seal 3 to move through a valve rod nut;
(4) the laser displacement sensor 20 measures the displacement of the piston and the seal 3, and the pull/pressure sensor 6 measures the tension or pressure transmitted to the piston and the seal 3;
(5) the laser displacement sensor 20 and the pull/pressure sensor 6 transmit the measured data to the control system 17;
(6) the laser displacement sensor 20 measures that the displacement is 4mm or the trigger signal of the first limit switch 10, and the micro motor 14 moves reversely after stopping for 10 seconds;
(7) the displacement is 0 again or a trigger signal of the second limit switch 11 is generated, the motor 14 stops, and the test operation is completed;
(8) the control system 17 draws a curve of displacement and time according to the measured data of the whole stroke of the laser displacement sensor 20, and calculates the average speed and corresponding acceleration of the piston and the seal 3; drawing a force-time curve according to the tension or pressure measured by the tension/pressure sensor 6, and obtaining corresponding data;
(9) according to the formula of the acceleration and the force, the friction force of the piston and the seal 3 in the tensile stress stage and the compressive stress stage is calculated;
(10) and comparing the calculated friction force with the friction force standard to determine whether the piston seal or the piston sleeve needs to be replaced.
Claims (10)
1. The utility model provides a pilot-operated formula safety valve switch board piston friction off-line measuring device which characterized in that: the device comprises a test platform, a first fixing plate, a second fixing plate and a pull/pressure sensor; the first fixing plate is fixed on the test platform, the piston sleeve is arranged in the middle of the first fixing plate, and the piston sleeve is connected with a piston and a seal; a guide rail is fixed on the test platform positioned on one side of the first fixing plate, the second fixing plate is matched with the guide rail and can slide along the guide rail, the pull/pressure sensor is connected with the micro motor, and the pull/pressure sensor is connected with the piston and in a sealing way; the pull/pressure sensor is connected with the control system, the first limit switch and the second limit switch are respectively connected with the control system, the micro motor is connected with the control system, and the laser displacement sensor is connected with the control system.
2. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the first fixing plate is fixed on the test platform through a bolt, the piston sleeve is installed in the middle of the first fixing plate, a protection gasket is installed between the piston sleeve and the first fixing plate, and the piston sleeve is connected with a piston and a seal.
3. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the first fixing plate and the second fixing plate are L-shaped.
4. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the middle of the second fixing plate is provided with a round hole.
5. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the pull/pressure sensor is connected with the micro motor in a threaded mode through a second connecting rod, and the inner thread of the second connecting rod is connected with the outer thread of the pull/pressure sensor.
6. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the pull/pressure sensor is connected with the piston and the sealing part through a first connecting rod, the external thread of the first connecting rod is connected with the internal bolt at the top of the piston, and the pressure or the pulling force of the motor is transmitted to the piston.
7. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the pull/pressure sensor is connected with the control system through a first lead.
8. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the first limit switch and the second limit switch are respectively connected with the control system through a second lead and a third lead.
9. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: and the test platform is provided with a corresponding bracket for fixing the first limit switch and the second limit switch.
10. The off-line measurement device of the friction force of the piston of the pilot operated safety valve control cabinet according to claim 1, wherein: the micro motor is connected with the control system through a fourth lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191823.3A CN114062247A (en) | 2021-10-13 | 2021-10-13 | Off-line measuring device for friction force of piston of pilot type safety valve control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191823.3A CN114062247A (en) | 2021-10-13 | 2021-10-13 | Off-line measuring device for friction force of piston of pilot type safety valve control cabinet |
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| Publication Number | Publication Date |
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| CN114062247A true CN114062247A (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111191823.3A Pending CN114062247A (en) | 2021-10-13 | 2021-10-13 | Off-line measuring device for friction force of piston of pilot type safety valve control cabinet |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4646556A (en) * | 1984-07-13 | 1987-03-03 | Framatome & Cie. | Process and apparatus for testing a pilot-operated safety valve |
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| CN103323389A (en) * | 2013-04-10 | 2013-09-25 | 浙江工业大学 | Frictional force testing device of friction-free cylinder |
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| CN104132805A (en) * | 2014-08-01 | 2014-11-05 | 清华大学 | Multifunctional pneumatic reciprocating sealing performance test bench |
| CN104374662A (en) * | 2014-12-01 | 2015-02-25 | 燕山大学 | Experimental machine for evaluating friction and wear properties in hydraulic valve core and valve body |
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| CN113376047A (en) * | 2021-07-05 | 2021-09-10 | 西南交通大学 | Rotary reciprocating friction testing machine |
-
2021
- 2021-10-13 CN CN202111191823.3A patent/CN114062247A/en active Pending
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|---|---|---|---|---|
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| CN103323389A (en) * | 2013-04-10 | 2013-09-25 | 浙江工业大学 | Frictional force testing device of friction-free cylinder |
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| CN104132805A (en) * | 2014-08-01 | 2014-11-05 | 清华大学 | Multifunctional pneumatic reciprocating sealing performance test bench |
| CN104374662A (en) * | 2014-12-01 | 2015-02-25 | 燕山大学 | Experimental machine for evaluating friction and wear properties in hydraulic valve core and valve body |
| CN105241809A (en) * | 2015-09-25 | 2016-01-13 | 浙江工业大学 | O-shaped ring friction experiment apparatus |
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| CN113376047A (en) * | 2021-07-05 | 2021-09-10 | 西南交通大学 | Rotary reciprocating friction testing machine |
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Application publication date: 20220218 |
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