CN110450101B - Use method of air-loss open type pneumatic valve - Google Patents
Use method of air-loss open type pneumatic valve Download PDFInfo
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- CN110450101B CN110450101B CN201910720586.1A CN201910720586A CN110450101B CN 110450101 B CN110450101 B CN 110450101B CN 201910720586 A CN201910720586 A CN 201910720586A CN 110450101 B CN110450101 B CN 110450101B
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- adjusting nut
- pneumatic valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1262—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being spring loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention relates to the technical field of disassembly, assembly and adjustment of pneumatic diaphragm valves, in particular to an installation, disassembly and adjustment method of a spring adjusting nut of an air-bleeding open type pneumatic valve and an application method of the air-bleeding open type pneumatic valve. In the practical application process, the device and the process of the invention are adopted, so that the replacement work of the spring adjusting nut of the actuating mechanism is well completed, the phenomenon that the thread of the push rod of the actuating mechanism and the spring adjusting nut are damaged and are forced to be replaced is avoided, the construction period is greatly shortened for the power plant to execute the maintenance task, and the high part replacement cost is saved.
Description
Technical Field
The invention relates to the technical field of disassembly, assembly and adjustment of a pneumatic diaphragm valve, in particular to an installation, disassembly and adjustment method of a spring adjusting nut of an air-bleeding open type pneumatic valve and an application method of the air-bleeding open type pneumatic valve.
Background
The pneumatic control valve has many applications in a pressurized water reactor nuclear power station, especially in key systems such as a waste heat deriving system and the like. The actuators of pneumatic control valves are of many types, and one type of pneumatic valve is a diaphragm type straight stroke actuator of the air-loss type, the closing force of the valve is derived from compressed air used by a power plant instrument, and the opening force is derived from a spring. The spring element of the actuator is arranged at the upper end of the diaphragm, and the opening force output by the actuator when the actuator is opened is very large due to the structural design of the valve body, so that the diameter of the spring element is large, and the rigidity coefficient is very high.
An authorized bulletin number CN207715813U, published on 2018, 8, 10, discloses a repacking device of a pneumatic membrane valve actuating mechanism, when the pneumatic membrane valve actuating mechanism is repacked, a thimble bolt penetrates through a screw thread on a fixing plate until the bolt tip of a thimble is propped against a circular groove of an upper cover lower pressing plate, the thimble bolt is screwed down, the upper cover lower pressing plate pushes an upper cover to move downwards until the thimble is contacted with a lower cover, and finally, the upper cover and the lower cover are fixed by a short bolt and a second nut, so that a spring is compressed between the upper cover and the lower cover to be fixed, and the problem that the spring is difficult to press due to high stiffness coefficient of the spring is solved.
However, when the output force of the spring of the actuating mechanism is adjusted through the spring adjusting nut, the general method is to install the sleeve head matched with the hexagonal surface of the spring adjusting nut on the spring adjusting nut, then use the long-rod torque wrench to manually tighten the nut and further compress the spring, the adjusting time is long, and the labor is consumed. Along with the power that spring adjusting nut received grow gradually, the spring force is finally transmitted to in the screw thread that spring adjusting nut and actuating mechanism axle were meshed, extrusion force and the frictional force that the screw thread pair bore are along with the crescent of spring force and increase gradually, the wearing and tearing of screw thread are also at further aggravation, treat wearing and tearing to certain degree, the thread thickness of stress surface one side can attenuate gradually or can break in the screw thread, the metal chip that wearing and tearing produced or cracked thread can persist in meshing screw thread pair, and continue to move along screw thread pair along with the further compression of spring, and then lead to the further damage of screw thread pair, can lead to the damage of spring adjusting nut and actuating mechanism axle even, even scrap. Also, metal chips or broken threads can cause damage or even rejection of the adjustment nut, valve stem, or the like when the spring adjustment nut is removed or adjusted.
The air-losing open type pneumatic valve with large output force is applied to key positions in a key system in a nuclear power plant due to good performance, and many of the air-losing open type pneumatic valves are applied to a nuclear island system. The time consumed by disassembling and assembling or adjusting the spring by the long-torque wrench is long, and if the disassembling and assembling or adjusting of the spring element cannot be completed due to metal scraps or broken screw teeth in the execution process, a maintainer can accept a longer irradiation dose, and even the overhaul period of the nuclear power station can be influenced when the damage degree is serious, so that the nuclear power station is influenced in the aspects of radiation dose and economy.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides a method for mounting a spring adjusting nut of an air-bleeding type pneumatic valve, comprising:
step S1, mounting a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the top end of the spring check and a fixed cap of the housing;
step S2, downward adjusting the spring check piece on the fixed top cover to make the bottom of the spring check piece contact with the top end of the spring element;
step S3, controlling the telescopic support to extend to compress the spring element;
step S4, adjusting the spring check downward so that its bottom contacts the top end of the spring element;
step S5, screwing down the spring adjusting nut to make the bottom of the spring adjusting nut contact with the top end of the spring element;
step S6, controlling the telescopic supporting piece to retract;
step S7, repeating steps S3-S6 until the spring element is compressed a specified distance L.
Further, the method further comprises:
step S2 further includes lowering the travel measurement member on the fixed top cover so that the bottom of the travel measurement member contacts the top of the telescoping support member; marking a position a2 on a stroke measuring piece on the fixed cap according to the designated distance L after the step S2 and before the step S3; said step S5 further includes, after the spring adjusting nut is turned down to bring its bottom into contact with the top end of the spring element, turning down the stroke measuring piece to bring its bottom into contact with the top of the telescopic support; in the step S7, the compression of the spring element by the designated distance L means that the mark of the position a2 is at the same height as the fixed top cover.
Preferably, the marking position said position a2 includes: position a1 is marked on the travel measurement piece at the same height position as the fixed cap, and position a2 is marked on the travel measurement piece at a specified distance L below the position a 1.
The invention also provides a method for disassembling the spring adjusting nut of the air-loss open type pneumatic valve, which is characterized by comprising the following steps:
step M1, installing a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the top end of the spring check and the fixed cap of the housing;
step M2, lowering the spring backstop on the fixed top cover to make the bottom of the spring backstop contact with the top end of the spring element;
step M3, controlling the telescopic support to extend to compress the spring element;
step M4, adjusting the spring check piece upwards, wherein the upward adjustment height of the spring check piece is smaller than the telescopic stroke of the telescopic support piece;
m5, a spring adjusting nut is screwed upwards, and the screwed height of the spring adjusting nut is more than or equal to the upward adjusting height of the spring check piece;
step M6, controlling the telescopic support to retract so that the top end of the spring element is in contact with the bottom of the spring adjusting nut;
step M7, repeating steps M3-M6 until the spring element is in a free threshold state.
Further, the step M2 includes lowering the stroke measuring member of the fixed top cover to make the bottom of the stroke measuring member contact with the top of the telescopic supporting member; marking a position B1 on the travel measurement piece at the same height position as the fixed cap after the step M2 and before the step M3; said step M6 further comprises, after controlling the telescopic support to retract such that the top end of said spring element contacts the bottom of said spring adjustment nut, adjusting said travel measurement member up such that its bottom contacts the top of said telescopic support; in the step M7, after the spring element is in the free threshold state, a position B2 is marked on the stroke measuring piece at the same height position as the fixed top cover.
The invention also provides an adjusting method of the spring adjusting nut of the air-loss open type pneumatic valve, which is characterized by comprising the following steps:
step N1, mounting a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the top end of the spring check and a fixed cap of the housing;
step N2, downward adjusting the spring backstop on the fixed top cover to make the bottom of the spring backstop contact with the top end of the spring element;
step N3, controlling the telescopic support to extend to compress the spring element;
step N4, if the output force of the spring element needs to be increased, adjusting the spring check downwards to make the bottom of the spring check contact with the top end of the spring element; adjusting the spring check upward if the output force of the spring element needs to be reduced and the upward adjustment height of the spring check is less than the telescoping travel of the telescoping support;
step N5, if the output force of the spring element needs to be increased, the spring adjusting nut is screwed down to enable the bottom of the spring adjusting nut to be in contact with the top end of the spring element; the spring adjusting nut is screwed upwards if the output force of the spring element needs to be reduced, and the screwed height of the spring adjusting nut is greater than or equal to the adjusted-up height of the spring check piece;
step N6, controlling the telescopic support to retract so that the top end of the spring element is contacted with the bottom of the spring adjusting nut;
and step N7, repeating the steps N3-N6 until the output force of the spring element meets the regulation requirement.
Preferably, in the step N7, the pneumatic valve is diagnosed to verify that the output force of the spring meets the regulation requirement.
The invention also provides a use method of the air-loss open type pneumatic valve, which is characterized by comprising the following steps:
a step L1 of mounting a spring adjusting nut using any of the above mounting methods such that a spring element of the pneumatic valve is compressed a specified distance L;
a step L2 of adjusting a spring adjusting nut by any one of the above adjusting methods so that the output force of the spring element of the pneumatic valve meets the adjustment requirement; wherein the specified distance L is determined by the output force of the spring element specified by the adjustment requirement.
Further, after the step L2, the method further includes: and L3, disassembling the spring adjusting nut by adopting the disassembling method of any one of the above methods.
Preferably, before the step L1, the method further includes: and a step L0 of taking one or more of corresponding industrial safety measures, personnel radiation protection measures, equipment damage protection measures and system foreign matter protection measures according to the installation environment of the pneumatic valve.
The invention has the following beneficial effects:
in the practical application process, the device and the process of the invention are adopted, so that the replacement work of the spring adjusting nut of the actuating mechanism is well completed, the phenomenon that the thread of the push rod of the actuating mechanism and the spring adjusting nut are damaged and are forced to be replaced is avoided, the construction period is greatly shortened for the power plant to execute the maintenance task, and the high part replacement cost is saved.
Drawings
FIG. 1 is a schematic view of an embodiment of an adjustment tool of the present invention.
Detailed Description
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that the conventional terms should be interpreted as having a meaning that is consistent with their meaning in the relevant art and this disclosure. The present disclosure is to be considered as an example of the invention and is not intended to limit the invention to the particular embodiments.
Example one
The use method of the air-bleeding type pneumatic valve is suitable for a mounting and dismounting adjusting tool of a spring adjusting nut of the air-bleeding type pneumatic valve shown in figure 1. The disassembly and assembly adjustment tool comprises a fixed top cover 11 and a telescopic support 21. Wherein the fixed cap 11 is mounted on an actuator 31 of the air-operated valve and is provided with a spring check 12 projecting towards a spring element 32 of the air-operated valve. The telescopic support 21 is supported between the end of the spring element 32 and the fixed cap 11 and the telescopic direction of the telescopic support 21 coincides with the telescopic direction of the spring element 32.
The fixed top cover 11 is an end cover of the housing 1, the inside of the housing 1 is provided with a spring movable cavity 13, and the other end of the spring movable cavity 13 opposite to the fixed top cover 11 is provided with an opening, so that the housing 1 can be buckled outside a spring element 32 of the pneumatic valve. A structure for fixedly connecting with the actuator 31 of the air-operated valve is provided at the other end of the housing 1 opposite to the fixed cap 11, for example, a connection screw hole may be provided around the opening of the spring movable chamber 13 at the other end of the housing 1 opposite to the fixed cap 11. In the maintenance, the spring cover cylinder originally protected outside the spring element 32 in the air-operated valve is removed, the housing 1 is mounted on the actuator 31 of the air-operated valve in a direction in which the opening of the spring movable chamber 13 faces downward, and the end of the housing 11 is fastened to the actuator 31 by the attachment bolt of the original spring cover cylinder.
Two elongated openings 14 for installing the telescopic supports 21 are symmetrically arranged at the middle position of the outer wall of the spring moving cavity 13 on the housing 1, and the elongated openings 14 provide a telescopic moving space for the telescopic supports 21 supported between the top ends of the spring elements 32 and the fixed top cover 11. When the telescopic support 21 is extended, the distance between the top end of the spring element 32 and the fixed cap 11 becomes large, so that the spring element 32 is compressed; when the telescopic support 21 is retracted, the distance between the top end of the spring element 32 and the fixed cap 11 becomes smaller, and the degree of compression of the compressed spring element 32 by its own restoring force is reduced.
The telescopic support 21 may be two jacks arranged symmetrically. The telescopic support of the present embodiment may be implemented using, for example, two hydraulic jacks. The hydraulic jack comprises hydraulic oil cylinders, hydraulic oil pumps 22 and two hydraulic oil pipes 23 which are respectively connected with the two hydraulic oil cylinders 21 and the two hydraulic oil pumps 22. Two hydraulic oil cylinders are respectively arranged in two elongated openings 14 of the shell 1 as telescopic supporting pieces 21 and are connected with a hydraulic oil pump 23 outside the shell 1 through a hydraulic oil pipe 23. The hydraulic jack adopts a thin type jack with small size and high strength, so that the hydraulic jack can be conveniently placed into the spring movable cavity 13 through the elongated openings 14 formed in the two sides of the shell 1, and the hydraulic oil pump and the high-pressure oil pipe can select suitable products on the market according to the output force of the spring element.
The spring check 12 is length-adjustably mounted on the fixed cap 11 and projects toward the spring element 32 of the pneumatic valve for abutting against the top end of the underlying spring element 32 to maintain the compressed state of the spring element 32 when the supporting force of the telescopic support 21 is withdrawn. The fixed top cover 11 is also provided with a through hole through which a spring adjusting nut 33 of the pneumatic valve passes.
The housing 1 may be a cylindrical structure processed from a metal material, and the spring movable cavity 13 is a cylindrical cavity coaxially disposed in the housing 1. The inner diameter of the spring movable cavity 13 is enlarged by 10 mm-20 mm on the basis of the outer diameter of the spring element 32, and the outer diameter of the spring movable cavity 13 is designed by calculating an appropriate wall thickness according to the compression force converted from the compression stroke of the spring element 32. 4 first screw holes which are uniformly distributed on the circumference are designed on the fixed top cover 11 and used for installing the spring check piece 12, the spring check piece 12 is realized by a first long rod single-head bolt and is made of a metal material with good pressure resistance, and heat treatment is carried out after machining is finished. The diameter of the first long rod single-head bolt can be calculated according to the output force of the spring component so as to ensure the strength requirement. The 4 first long rod single-headed bolts are respectively installed in the 4 first screw holes and protrude toward the inner spring movable chamber 13.
The size of the through hole in the center of the fixed top cover 11 is increased by 0.2 mm-0.3 mm on the basis of the outer diameter of the spring adjusting nut 33, so that the spring adjusting nut 33 can conveniently provide accurate guide when rotating on the shaft of the executing mechanism 31. The outer wall of the shell 1 is designed with a handle which is convenient to install.
The use method of the air-bleeding open type pneumatic valve comprises the following steps:
step S1, a housing is mounted outside the spring element of the pneumatic valve, supporting the telescoping support between the top end of the spring check and the end cap of the housing. The specific operation is as follows: after removing the spring cap of the air-loss opening type air-operated valve, the housing 1 is mounted on the actuator 31 of the air-operated valve in a direction in which the opening of the spring movable chamber 13 faces downward, and the end of the housing 11 is fastened to the actuator 31 by the attachment bolt of the original spring cap. The spring check 12 is mounted to the fixed cap through a first screw hole in the fixed cap 11. Two hydraulic oil cylinders of the telescopic support 21 are respectively installed in the two elongated openings 14 on the two sides of the housing 1, so that the hydraulic oil cylinders are positioned in the spring movable cavity 13 and can be supported between the fixed top cover 11 and the top ends of the spring elements 32, and the hydraulic oil pump 22 and the hydraulic oil cylinders are connected through the hydraulic oil pipes 23.
At step S2, the spring check on the fixed cap is lowered so that its bottom contacts the top end of the spring element. The specific operation is as follows: the first long rod single-ended screw is adjusted downwards so that it protrudes towards the spring element inside the spring activity chamber 13 and eventually its bottom comes into contact with the top end of the spring element.
Step S3, controlling the telescopic support to extend to compress the spring element. The specific operation is as follows: the hydraulic oil pump is started to press the hydraulic jack, so that the hydraulic oil cylinder extends out, the distance between the top end of the spring element 32 and the fixed top cover 11 is increased, the spring element 32 is compressed, and the compression distance is within the telescopic stroke range of the hydraulic oil cylinder.
Step S4, adjust the spring check downward with its bottom in contact with the top end of the spring element. The specific operation is as follows: the first long rod single-ended screw is adjusted downwards so that it protrudes towards the spring element inside the spring activity chamber 13 and eventually its bottom comes into contact with the top end of the spring element. The extension lengths of the four first long-rod single-head screws are kept as consistent as possible, so that the top ends of the spring elements can be approximately horizontal.
In step S5, the spring adjusting nut is turned down so that its bottom contacts the top end of the spring element. The specific operation is as follows: the spring adjustment nut 33 is screwed down along the threads of the push rod of the actuator 31 into contact with the upper portion of the spring top cover 4.
And step S6, controlling the telescopic support member to retract. The specific operation is as follows: hydraulic oil pump 22 is deactivated and the hydraulic circuit is depressurized allowing the hydraulic rams to retract.
Step S7, repeating steps S3-S6 until the spring element is compressed a specified distance L. The specified distance L can be confirmed by referring to a document or a drawing. Preferably, the specified distance L can be determined by a user based on a desired pneumatic valve spring element output force.
After the spring adjustment nut is installed by method L1, the following method may be performed to adjust the spring adjustment nut as needed:
l2. the adjusting method of the spring adjusting nut comprises the following steps of N1-N7:
step N1, installing a housing outside the spring element of the pneumatic valve, supporting the telescoping support between the top end of the spring check and a fixed cap of the housing. The detailed operation is similar to step S1, and is not repeated here for brevity.
Step N2, the spring check on the fixed cap is lowered so that its bottom contacts the top end of the spring element. The detailed operation is similar to step S2, and is not repeated here for brevity.
Step N3, the telescoping support extension is activated to compress the spring element. The detailed operation is similar to step S3, and is not repeated here for brevity.
Step N4, adjust the spring check downward so that its bottom contacts the top of the spring element if the output force of the spring element needs to be increased. The specific operation is as follows: the first long rod single-headed screw is adjusted downward so that it protrudes toward the spring element in the spring movement chamber 13 and eventually its bottom portion comes into contact with the top end of the spring element, so that the spring element is held against the spring check even if the supporting force of the telescopic support is removed. The extension lengths of the four first long-rod single-head screws are kept as consistent as possible, so that the top ends of the spring elements can be approximately horizontal. The spring return is adjusted upward if the output force of the spring element is to be reduced and the upward adjustment of the spring return is less than the telescoping travel of the telescoping support. The specific operation is as follows: the first long rod single-end screw is adjusted upwards to enable the first long rod single-end screw to withdraw towards the outside of the spring movable cavity 13, and the height of the first long rod single-end screw is adjusted upwards to be smaller than the compression stroke of the hydraulic oil cylinder. This will cause the first long rod single headed screw to no longer bear against the top end of the spring member, supported between the top end of the spring member and the fixed top cover only by the extending hydraulic ram. The extension lengths of the four first long rod single-head screw rods are kept consistent as much as possible.
At step N5, if the output force of the spring element needs to be increased, the spring adjustment nut is rotated down so that its bottom contacts the top of the spring element. The spring adjustment nut 33 is screwed down along the threads of the push rod of the actuator 31 into contact with the upper portion of the spring top cover 4. Therefore, when the compression oil cylinder is decompressed and retracted and the supporting force is removed, the spring element 32 positioned at the bottom of the compression oil cylinder can still keep the compression state before the supporting force is removed due to the existence of the spring adjusting nut, and therefore the adjustment of the compression distance of the spring is realized. When the spring adjusting nut is screwed down, the compression oil cylinder still keeps extending out, and the first long rod single-head screw rod is also propped against the top of the spring element, so that the spring adjusting nut and the thread pair of the actuating mechanism are prevented from being damaged due to the resistance of the spring element in the opposite direction during screwing down. And if the output force of the spring element needs to be reduced, the spring adjusting nut is screwed upwards, and the screwed height of the spring adjusting nut is less than or equal to the screwed-up height of the spring check piece. The specific operation is as follows: and (3) screwing the spring adjusting nut upwards along the thread of the actuating mechanism, wherein the screwing-out distance is controlled within the compression stroke range of the hydraulic oil cylinder, and the screwing-up height of the spring adjusting nut is controlled to be more than or equal to the upward adjusting height of the spring check piece in the step N4. So, when compression cylinder pressure release when retracting, the restoring force direct action of spring element is on the spring non return spare that is located spring adjusting nut below, and can not cause the impact to spring adjusting nut, avoids the vice damage of spring adjusting nut and actuating mechanism screw thread.
Step N6, control the telescoping support to retract such that the top end of the spring element contacts the bottom of the spring adjustment nut. The specific operation is as follows: hydraulic oil pump 22 is deactivated and the hydraulic circuit is depressurized allowing the hydraulic rams to retract. The compression oil cylinder retracts, so that the supporting force between the fixed top cover and the spring element is cancelled by the compression oil cylinder, and the output force of the spring element is adjusted up or down once.
And step N7, repeating the steps N3-N6 until the output force of the spring element meets the regulation requirement. For example, prior art pneumatic valve diagnostics may be employed to verify that the output force of the spring element is satisfactory.
Preferably, the de-aeration open type pneumatic valve of the embodiment further comprises, after adjusting the spring adjusting nut by the method L2, performing the following method to disassemble the spring adjusting nut as required:
l3. disassembling method of spring adjusting nut of air-out type pneumatic valve, comprising the following steps M1-M7:
step M1, installing a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the top end of the spring check and the fixed cap of the housing. The detailed operation is similar to step S1, and is not repeated here for brevity.
Step M2, the spring check on the fixed cap is lowered so that its bottom contacts the top end of the spring element. The detailed operation is similar to step S2, and is not repeated here for brevity.
Step M3, the telescopic support is controlled to extend to compress the spring element. The detailed operation is similar to step S3, and is not repeated here for brevity.
And M4, adjusting the spring check piece upwards, wherein the upward adjustment height of the spring check piece is smaller than the telescopic stroke of the telescopic support piece. The specific operation is as follows: the first long rod single-end screw is adjusted upwards to enable the first long rod single-end screw to withdraw towards the outside of the spring movable cavity 13, and the height of the first long rod single-end screw is adjusted upwards to be smaller than the compression stroke of the hydraulic oil cylinder. This will cause the first long rod single headed screw to no longer bear against the top end of the spring member, supported between the top end of the spring member and the fixed top cover only by the extending hydraulic ram. The extension lengths of the four first long rod single-head screw rods are kept consistent as much as possible.
And M5, screwing a spring adjusting nut, wherein the screwed height of the spring adjusting nut is more than or equal to the upward adjusting height of the spring check piece. The specific operation is as follows: and (3) screwing the spring adjusting nut upwards along the thread of the actuating mechanism, wherein the screwing-out distance is controlled within the compression stroke range of the hydraulic oil cylinder, and the screwing-up height of the spring adjusting nut is controlled to be greater than or equal to the upward adjusting height of the spring check piece in the step M4. So, when compression cylinder pressure release when retracting, the restoring force direct action of spring element is on the spring non return spare that is located spring adjusting nut below, and can not cause the impact to spring adjusting nut, avoids the vice damage of spring adjusting nut and actuating mechanism screw thread.
Step M6, controlling the telescopic support to retract so that the top end of the spring element contacts the bottom of the spring adjusting nut. The specific operation is as follows: hydraulic oil pump 22 is deactivated and the hydraulic circuit is depressurized allowing the hydraulic rams to retract. The compression oil cylinder retracts, so that the supporting force between the fixed top cover and the spring element is cancelled by the compression oil cylinder.
Step M7, repeating steps M3-M6 until the spring element is in a free threshold state. After the spring element is in a free state, the spring element has no rebound force to the spring adjusting nut positioned at the top end of the spring element, and the spring adjusting nut can be manually screwed continuously so as to be completely detached.
Preferably, before the step L1 in another embodiment, the method further includes:
and a step L0 of taking one or more of corresponding industrial safety measures, personnel radiation protection measures, equipment damage protection measures and system foreign matter protection measures according to the installation environment of the pneumatic valve.
By selectively performing the above-described method for performing disassembly, assembly or adjustment of the spring element of the actuator. After the replacement of the diaphragm, actuator push rod or other components is completed and the final complete actuator reassembly, the seating force of the valve, the coefficient of stiffness of the spring, the packing friction, etc. may be measured by valve performance diagnostic equipment. If the compression force of the spring is not met or the stiffness coefficient of the spring is not in accordance with the requirements of the manufacturer, the spring of the actuating mechanism can be adjusted or replaced again by selectively executing the method until the technical specification of the valve and the requirements of the factory documents are met.
Example two
The application method of the air-bleeding type pneumatic valve is characterized in that the dismounting and adjusting tool of the spring adjusting nut of the air-bleeding type pneumatic valve, which is suitable for the air-bleeding type pneumatic valve, further comprises a stroke measuring piece 15 arranged on a fixed top cover 11 on the basis of the dismounting and adjusting tool in the first embodiment. The stroke measuring member 15 is mounted on the fixed head 11 with its length adjustable and the telescopic support 21 is extended. Position markings may be provided on the travel measurement member 15 to assist in measuring the compression distance of the spring element 13.
For example, in the present embodiment, the fixed top cover 11 of the spring moving cavity 13 is designed with 6 threaded holes, wherein 4 threaded holes uniformly distributed on the circumference are first threaded holes for installing the spring check member 12, and the other 2 threaded holes are arranged at positions corresponding to the elongated opening 14 of the housing 1 and are second threaded holes for installing the stroke measuring member 15. The stroke measuring member 15 can also be realized by a second long rod single-headed bolt.
Based on the use method of the air-loss open type pneumatic valve in the embodiment, the following contents are added on the basis of the use method of the pneumatic valve in the embodiment one:
l1 of the present embodiment, a method of mounting a spring adjusting nut, includes:
step S2 further includes lowering the travel measurement member on the fixed top cover so that its bottom contacts the top of the telescoping support member. The specific operation is as follows: the second long rod single head screw is adjusted downward so that it extends toward the hydraulic ram within the spring activity chamber 13 and eventually its bottom comes into contact with the top end of the hydraulic ram. The extension lengths of the two single-end screw rods of the second long rod are consistent as much as possible.
After step S2 and before step S3, position a2 is marked on the stroke measuring piece on the fixed top cover according to the specified distance L. The specific operation is as follows: position a1 is marked on the stroke gauge at the same height as the fixed cap and position a2 is marked on the stroke gauge at a specified distance L below position a 1.
Step S5 also includes lowering the travel measurement member down to bring its bottom into contact with the top of the telescoping support member after the spring adjustment nut is lowered to bring its bottom into contact with the top of the spring element. The specific operation comprises the following steps: the second long rod single head screw is adjusted downward so that it extends toward the hydraulic ram within the spring activity chamber 13 and eventually its bottom comes into contact with the top end of the hydraulic ram.
In step S7, compressing the spring element by the designated distance L means that the marker at position a2 is at the same height as the fixed top cover.
L3 of the present embodiment in the method of removing a spring adjustment nut for a de-aired open pneumatic valve:
step M2 further includes lowering the travel measurement member on the fixed top cover so that its bottom contacts the top of the telescoping support member. The specific operation is as follows: the second long rod single head screw is adjusted downward so that it extends toward the hydraulic ram within the spring activity chamber 13 and eventually its bottom comes into contact with the top end of the hydraulic ram.
After step M2, before step M3, position B1 is marked on the stroke gauge at the same height position as the fixed cap.
Step M6 further includes, after controlling the telescoping support to retract such that the top end of the spring element contacts the bottom of the spring adjustment nut, adjusting the travel measurement member up such that its bottom contacts the top of the telescoping support. After the telescopic supporting piece retracts, the supporting force supported between the top end of the spring element and the fixed top cover is removed, the spring element rebounds upwards to the position of the spring check piece under the restoring force of the spring element, and the hydraulic oil cylinder at the top end of the spring element synchronously moves upwards along with the end part of the spring element. The second long rod single head screw is adjusted upwards so that it exits towards the outside of the spring activity chamber 13 and finally its bottom comes into contact with the top end of the hydraulic cylinder.
In step M7, after the spring element is in the free threshold state, position B2 is marked on the stroke measurement piece at the same height position as the fixed cap. The distance between position B1 and position B2 the spring element is compressed a distance before the spring adjustment nut is removed. The distance between position B1 and position B2 is measured and recorded in this embodiment and may be used for subsequent spring element installation or adjustment.
By selectively performing the above-described method for performing disassembly, assembly or adjustment of the spring element of the actuator. After the replacement of the diaphragm, actuator push rod or other components is completed and the final complete actuator reassembly, the seating force of the valve, the coefficient of stiffness of the spring, the packing friction, etc. may be measured by valve performance diagnostic equipment. If the compression force of the spring is not met or the stiffness coefficient of the spring is not in accordance with the requirements of the manufacturer, the spring of the actuating mechanism can be adjusted or replaced again by selectively executing the method until the technical specification of the valve and the requirements of the factory documents are met.
Although embodiments of the present invention have been described, various changes or modifications may be made by one of ordinary skill in the art within the scope of the appended claims.
Claims (7)
1. A method of using a de-aired open pneumatic valve, comprising:
l1, mounting a spring adjusting nut by adopting a mounting method of the spring adjusting nut of the air-loss open type pneumatic valve, so that a spring element of the pneumatic valve is compressed by a specified distance L;
l2, adjusting a spring adjusting nut by adopting an adjusting method of the spring adjusting nut of the air-loss open type pneumatic valve, so that the output force of a spring element of the pneumatic valve meets the adjusting requirement;
wherein the specified distance L is determined by the output force of the spring element specified by the adjustment requirement;
the installation method in the step L1 includes:
step S1, mounting a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the tip of the spring element and a fixed cap of the housing;
step S2, downward adjusting the spring check piece on the fixed top cover to make the bottom of the spring check piece contact with the top end of the spring element;
step S3, controlling the telescopic support to extend to compress the spring element;
step S4, adjusting the spring check downward so that its bottom contacts the top end of the spring element;
step S5, screwing down the spring adjusting nut to make the bottom of the spring adjusting nut contact with the top end of the spring element;
step S6, controlling the telescopic supporting piece to retract;
step S7, repeating steps S3-S6 until the spring element is compressed a specified distance L;
the adjusting method in the step L2 includes:
step N1, mounting a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the top end of the spring element and the fixed end cap of the housing;
step N2, downward adjusting the spring backstop on the fixed top cover to make the bottom of the spring backstop contact with the top end of the spring element;
step N3, controlling the telescopic support to extend to compress the spring element;
step N4, if the output force of the spring element needs to be increased, adjusting the spring check downwards to make the bottom of the spring check contact with the top end of the spring element; adjusting the spring check upward if the output force of the spring element needs to be reduced and the upward adjustment height of the spring check is less than the telescoping travel of the telescoping support;
step N5, if the output force of the spring element needs to be increased, the spring adjusting nut is screwed down to enable the bottom of the spring adjusting nut to be in contact with the top end of the spring element; the spring adjusting nut is screwed upwards if the output force of the spring element needs to be reduced, and the screwed height of the spring adjusting nut is greater than or equal to the adjusted-up height of the spring check piece;
step N6, controlling the telescopic support to retract so that the top end of the spring element is contacted with the bottom of the spring adjusting nut;
and step N7, repeating the steps N3-N6 until the output force of the spring element meets the regulation requirement.
2. The method of using a lost-air, open-type pneumatic valve of claim 1, further comprising:
step S2 further includes lowering the travel measurement member on the fixed top cover so that the bottom of the travel measurement member contacts the top of the telescoping support member;
marking a position a2 on a stroke measuring piece on the fixed cap according to the designated distance L after the step S2 and before the step S3;
said step S5 further includes, after the spring adjusting nut is turned down to bring its bottom into contact with the top end of the spring element, turning down the stroke measuring piece to bring its bottom into contact with the top of the telescopic support;
in the step S7, the compression of the spring element by the designated distance L means that the mark of the position a2 is at the same height as the fixed top cover.
3. A method of using a lost-air, open-type pneumatic valve as set forth in claim 2, wherein:
marking the position a2 includes:
position a1 is marked on the travel measurement piece at the same height position as the fixed cap, and position a2 is marked on the travel measurement piece at a specified distance L below the position a 1.
4. A method of using a de-aired, open pneumatic valve as claimed in any one of claims 1-3, wherein said step L2 is followed by the further step of:
and L3, disassembling the spring adjusting nut by adopting a disassembling method of the air-loss open type pneumatic valve spring adjusting nut.
5. The method of using a blow-off pneumatic valve as in claim 4 wherein the method of removing the blow-off pneumatic valve spring adjustment nut comprises:
step M1, installing a housing outside the spring element of the pneumatic valve, supporting the telescopic support between the top end of the spring check and the fixed cap of the housing;
step M2, lowering the spring backstop on the fixed top cover to make the bottom of the spring backstop contact with the top end of the spring element;
step M3, controlling the telescopic support to extend to compress the spring element;
step M4, adjusting the spring check piece upwards, wherein the upward adjustment height of the spring check piece is smaller than the telescopic stroke of the telescopic support piece;
m5, a spring adjusting nut is screwed upwards, and the screwed height of the spring adjusting nut is more than or equal to the upward adjusting height of the spring check piece;
step M6, controlling the telescopic support to retract so that the top end of the spring element is in contact with the bottom of the spring adjusting nut;
step M7, repeating steps M3-M6 until the spring element is in a free threshold state.
6. Use of a lost-air open pneumatic valve as set forth in claim 5 wherein:
said step M2 further comprises lowering the travel measurement member on the fixed top cover so that its bottom contacts the top of the telescoping support member;
marking a position B1 on the travel measurement piece at the same height position as the fixed cap after the step M2 and before the step M3;
said step M6 further comprises, after controlling the telescopic support to retract such that the top end of said spring element contacts the bottom of said spring adjustment nut, adjusting said travel measurement member up such that its bottom contacts the top of said telescopic support;
in the step M7, after the spring element is in the free threshold state, a position B2 is marked on the stroke measuring piece at the same height position as the fixed top cover.
7. A method of using a de-gassed, open pneumatic valve as described in claim 1 and further comprising, prior to said step L1:
and a step L0 of taking one or more of corresponding industrial safety measures, personnel radiation protection measures, equipment damage protection measures and system foreign matter protection measures according to the installation environment of the pneumatic valve.
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| CN201910720586.1A CN110450101B (en) | 2019-08-06 | 2019-08-06 | Use method of air-loss open type pneumatic valve |
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|---|---|---|---|
| CN201910720586.1A CN110450101B (en) | 2019-08-06 | 2019-08-06 | Use method of air-loss open type pneumatic valve |
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| CN110450101A CN110450101A (en) | 2019-11-15 |
| CN110450101B true CN110450101B (en) | 2021-04-02 |
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| CN110450101A (en) | 2019-11-15 |
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