CN117300803B - Safety valve grinding device and grinding method - Google Patents
Safety valve grinding device and grinding methodInfo
- Publication number
- CN117300803B CN117300803B CN202311259026.3A CN202311259026A CN117300803B CN 117300803 B CN117300803 B CN 117300803B CN 202311259026 A CN202311259026 A CN 202311259026A CN 117300803 B CN117300803 B CN 117300803B
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- China
- Prior art keywords
- grinding
- valve seat
- sealing surface
- guide sleeve
- valve
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
- B24B15/04—Machines or devices designed for grinding seat surfaces; Accessories therefor on valve members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
- B24B15/08—Machines or devices designed for grinding seat surfaces; Accessories therefor for grinding co-operating seat surfaces by moving one over the other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
本公开实施例提供一种安全阀研磨装置及研磨方法，安全阀包括相互配合的阀座和阀芯，阀座包括第一阀座和伸缩设置在第一阀座内的第二阀座，该装置包括导向套、支撑套、紧固件和研磨板；支撑套设置于研磨板，支撑套内套设有导向套，第一阀座的第一端固定于导向套的第一端，第一阀座的第二端穿过支撑套与研磨板接触；紧固件插置于导向套的第二端并与第二阀座抵接，以调节第二阀座的伸缩量，使第一阀座的密封面与第二阀座的密封面齐平；研磨板用于在转动导向套时，阀座的密封面进行同步研磨。该装置解决了研磨时第一阀座和第二阀座无法有效固定的问题，能够达到较好的研磨效果，研磨的稳定性高和研磨效率高。
The disclosed embodiments provide a safety valve grinding device and grinding method, wherein the safety valve includes a valve seat and a valve core that cooperate with each other, the valve seat including a first valve seat and a second valve seat telescopically arranged inside the first valve seat, and the device includes a guide sleeve, a support sleeve, a fastener, and a grinding plate; the support sleeve is arranged on the grinding plate, and a guide sleeve is arranged inside the support sleeve, the first end of the first valve seat is fixed to the first end of the guide sleeve, and the second end of the first valve seat passes through the support sleeve and contacts the grinding plate; the fastener is inserted into the second end of the guide sleeve and abuts against the second valve seat to adjust the expansion and contraction of the second valve seat so that the sealing surface of the first valve seat is flush with the sealing surface of the second valve seat; the grinding plate is used to synchronously grind the sealing surface of the valve seat when the guide sleeve is rotated. This device solves the problem that the first valve seat and the second valve seat cannot be effectively fixed during grinding, and can achieve a better grinding effect, high grinding stability, and high grinding efficiency.
Description
Technical Field
The embodiment of the disclosure belongs to the technical field of safety valve grinding tools, and particularly relates to a safety valve grinding device and a grinding method.
Background
The helium medium safety valve of the high-temperature gas cooled reactor is arranged on a loop pressure relief system, the loop pressure relief system bears the protection function of loop pressure boundary equipment, and the helium medium safety valve is important key equipment of the loop pressure relief system and performs the pressure relief function. The helium medium safety valve belongs to important pressure-bearing boundary equipment of a primary loop of a reactor, the internal sealing and the external sealing requirements are very strict, and the internal leakage and the external leakage of the safety valve can cause the leakage of radioactive medium of the primary loop.
In order to ensure the sealing performance index of the safety valve, the helium safety valve of the primary circuit pressure relief system uses a pilot-operated safety valve with more reliable sealing performance, and compared with a spring-type safety valve, the pilot-operated safety valve has higher sealing reliability, but has a complex structure, a large number of sealing pairs and larger maintenance workload.
The helium medium safety valve adopts a pilot-operated safety valve, a pilot valve part of the pilot-operated safety valve is designed into a double-valve seat structure, a runner and a structure of the pilot-operated safety valve are called as an upper tee, and as shown in fig. 1, the upper tee structure comprises a sleeve-shaped first valve seat 210 and a needle-shaped second valve seat 220, a valve core 230 is also divided into a valve core inner ring and a valve core outer ring, the valve core inner ring is matched with the needle-shaped second valve seat 220, the valve core outer ring is matched with the sleeve-shaped first valve seat 210, the needle-shaped second valve seat 220 is provided with a metal bellows structure, and the metal bellows structure can freely stretch and retract, so that the fitting and the separation of the valve core are realized.
The structural dimensions of the upper tee are small, wherein the diameter of the spool 230 is only 9.5mm, the diameter of the ring of the second valve seat 220 in the upper tee which is matched with the spool is only 6mm, and the effective grinding amount of the sealing surface is only 0.5mm. The sealing requirement of the upper tee part is higher, and the upper tee part needs to be ground and repaired during unit overhaul so as to ensure the effective sealing of the upper tee part. The second valve seat 220 in the upper tee is of an irregular structure, which needs to be effectively fixed, and the first valve seat 210 and the second valve seat 220 of the upper tee need to be synchronously ground. The upper tee valve seat is of an elongated structure, and direct manual grinding can cause component dumping in the grinding process, so that grinding efficiency is affected.
The effective grinding allowance of the safety valve is limited, a special grinding process method needs to be configured, and the number of times of repair is controlled through the effective grinding process method and the acceptance judging method.
In the prior art, the grinding of the safety valve mainly has the following problems:
1) The parts cannot be effectively fixed during grinding, and the grinding stability is poor;
2) The grinding operation has higher requirements on the grinding skill level of operators;
3) A grinding process and a grinding quality judging method;
4) The effective grinding amount is small, and the control on the grinding repair times is strict.
In view of the above, it is necessary to provide a relief valve polishing apparatus and a polishing method that are reasonably designed and that effectively solve the above problems.
Disclosure of Invention
The embodiment of the disclosure aims to at least solve one of the technical problems in the prior art and provides a safety valve grinding device and a grinding method.
An aspect of an embodiment of the present disclosure provides a safety valve grinding device, where the safety valve includes a valve seat and a valve core that are matched with each other, the valve seat includes a first valve seat and a second valve seat that is telescopically disposed in the first valve seat, and the grinding device includes a guide sleeve, a support sleeve, a fastener, and a grinding plate;
The support sleeve is arranged on the grinding plate, the guide sleeve is sleeved in the support sleeve, the first end of the first valve seat is fixed at the first end of the guide sleeve, and the second end of the first valve seat passes through the support sleeve to be in contact with the grinding plate;
The fastener is inserted into the second end of the guide sleeve and is abutted against the second valve seat so as to adjust the expansion and contraction amount of the second valve seat, and the sealing surface of the first valve seat is flush with the sealing surface of the second valve seat;
And the grinding plate is used for synchronously grinding the sealing surface of the first valve seat and the sealing surface of the second valve seat when the guide sleeve is rotated.
Optionally, the locking device further comprises a locking piece, wherein the locking piece is sleeved on the outer side of the fastening piece and is arranged on the top wall of the second end of the guide sleeve, so that the fastening piece is locked.
Optionally, the lateral wall of fastener is provided with the external screw thread, the inside wall of uide bushing second end be provided with external screw thread assorted internal screw thread, the fastener spiro union in the second end of uide bushing.
Optionally, the first end of uide bushing is provided with first step structure, first step structure card is equipped with the first end of first disk seat.
Optionally, the inner side wall of the supporting sleeve is sequentially provided with a second step structure and a third step structure from one end facing the grinding plate to one end deviating from the grinding plate;
the second step structure card is equipped with the second end of first disk seat, the third step structure card is equipped with the first end of uide bushing.
Optionally, a plurality of exhaust holes are formed in one end of the supporting sleeve, which faces the grinding plate.
Another aspect of the embodiments of the present disclosure provides a method for grinding a safety valve, using the safety valve grinding device described above, the method including:
fixing the first valve seat and the second valve seat through the grinding device, and adjusting the sealing surface of the first valve seat to be flush with the sealing surface of the second valve seat;
pre-inspecting the sealing surface of the first valve seat and the sealing surface of the second valve seat;
And if the grinding conditions are met, rotating the guide sleeve to sequentially perform rough grinding, fine grinding and polishing on the sealing surface of the first valve seat and the sealing surface of the second valve seat, and judging the surface roughness and the surface gloss of the sealing surface after each grinding.
Optionally, the pre-checking the sealing surface of the first valve seat and the sealing surface of the second valve seat includes:
Observing the appearance conditions of the sealing surface of the first valve seat and the sealing surface of the second valve seat under a high-power microscope, checking the distribution condition of defects of the sealing surfaces,
If the defect depth of the sealing surface is more than 0.2mm, judging that the grinding condition is not met;
and if the defect depth defect of the sealing surface is less than or equal to 0.2mm, judging that the grinding condition is met.
Optionally, the rotating the guide sleeve sequentially performs rough grinding, fine grinding and polishing on the sealing surface of the first valve seat and the sealing surface of the second valve seat, and evaluates the surface roughness and the surface gloss of the sealing surface after each grinding, including:
Fixing sand paper with granularity ranging from 25 mu to 35 mu on the grinding plate, rotating the guide sleeve in the same direction, applying 15N-20N pressure to the second valve seat, and carrying out rough grinding on the sealing surface;
Stopping grinding when grinding for 10 to 20 circles, judging the surface roughness and the surface gloss of the sealing surface, and stopping rough grinding if the micro scratches and pits of the sealing surface are eliminated, the sealing surface is grey black and the surface gloss is consistent;
After rough grinding is finished, sand paper with the granularity range of 15 mu to 20 mu is fixed on the grinding plate, the guide sleeve is rotated in the same direction, 10N to 15N pressure is applied to the second valve seat, and fine grinding is carried out on the sealing surface;
And stopping grinding when grinding for 30 to 40 circles, judging the surface roughness and the surface gloss of the sealing surface, and stopping fine grinding if micro lines generated by grinding are uniformly distributed and have uniform depth, the sealing surface is basically bright, the surface gloss is basically uniform, and no darkening phenomenon exists locally.
Optionally, the rotating the guide sleeve sequentially performs rough grinding, fine grinding and polishing on the sealing surface of the first valve seat and the sealing surface of the second valve seat, and evaluates the surface roughness and the surface gloss of the sealing surface after each grinding, and further includes:
After finishing fine grinding, fixing sand paper with granularity ranging from 8 mu to 10 mu on the grinding plate, rotating the guide sleeve, and accurately grinding the sealing surface along the same direction without applying additional pressing force;
The grinding speed is 50-100 rpm, grinding is stopped after 2-3 min, the surface roughness and the surface gloss of the sealing surface are judged, if the sealing surface has no obvious grinding lines, the sealing surface is a bright surface, and the surface gloss is completely consistent, fine grinding is stopped;
After finishing fine grinding, fixing sand paper with granularity ranging from 1 mu to 5 mu on the grinding plate, rotating the guide sleeve, and grinding and polishing the sealing surface along the same direction without applying additional pressing force;
The grinding speed is 100-150 rpm, the grinding is stopped after the grinding is performed for 5-6 min, the surface roughness and the surface gloss of the sealing surface are judged, and if the surface roughness is consistent, no grinding trace exists, the whole sealing surface is shiny, and the surface gloss is consistent, the grinding of the sealing surface is completed.
According to the safety valve grinding device and the grinding method, the first valve seat is fixed through the guide sleeve, the sealing surface of the first valve seat and the sealing surface of the second valve seat are adjusted to be flush through the fastener, the second valve seat is fixed, the sealing surface of the first valve seat and the sealing surface of the second valve seat are synchronously ground through rotating the guide sleeve, the grinding device can be well matched with the ground part of the safety valve, the overall dimension is small, the operation is flexible and convenient, the problem that the first valve seat and the second valve seat cannot be effectively fixed during grinding is solved through the grinding device, the good grinding effect can be achieved, and the grinding stability and the grinding efficiency are high. The grinding method provides a grinding quality judging method, which can effectively control the times of grinding repair and prolong the service life of equipment.
Drawings
FIG. 1 is a schematic diagram of an assembled structure of a valve seat and a valve core of a safety valve in the prior art;
FIG. 2 is a schematic structural view of a grinding device for a safety valve according to an embodiment of the disclosure;
FIG. 3 is an exploded view of a relief valve grinding apparatus according to another embodiment of the present disclosure;
FIG. 4 is a schematic illustration of an assembly of a guide sleeve with a valve seat according to another embodiment of the present disclosure;
FIG. 5 is a schematic view of a support sleeve and an exhaust hole according to another embodiment of the disclosure;
FIG. 6 is a schematic view of the second step structure and the third step structure in the support sleeve according to another embodiment of the present disclosure;
FIG. 7 is a schematic view of a support sleeve according to another embodiment of the present disclosure;
fig. 8 is a schematic flow chart of a method for grinding a safety valve according to another embodiment of the disclosure.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings and detailed description.
An aspect of the disclosed embodiments provides a relief valve lapping device 100 for lapping a relief valve, as shown in fig. 1, the relief valve including a valve seat and a valve spool 230 that cooperate with each other, the valve seat including a first valve seat 210 and a second valve seat 220 telescopically disposed within the first valve seat 210.
Specifically, in this embodiment, as shown in fig. 1, the safety valve is a helium medium safety valve applied to a high-temperature gas cooled reactor, the helium medium safety valve adopts a pilot type safety valve, a pilot valve part of the pilot type safety valve is designed to be of a double-valve seat structure, an upper three-way valve seat of the pilot valve is divided into a sleeve-shaped first valve seat 210 and a needle-shaped second valve seat 220, and the sleeve-shaped first valve seat and the needle-shaped second valve seat are in contact with each other to realize sealing. The first valve seat 210, the second valve seat 220 and the butterfly valve core 230 are matched in a manner shown in fig. 1, the needle-shaped second valve seat 220, the sleeve-shaped first valve seat 210, the butterfly valve core 230 and the valve core supporting ring 240 are sequentially arranged from top to bottom, the needle-shaped second valve seat 220 is telescopically inserted into the sleeve-shaped first valve seat 210, and thus the sleeve-shaped first valve seat 210 can serve as a guide and a support for the needle-shaped second valve seat 220.
During normal operation of the safety valve, the needle-shaped second valve seat 220 and the butterfly valve core 230 are in contact with each other, and are in a planar sealing structure, and when the safety valve is tripped, the needle-shaped second valve seat 220 and the butterfly valve core 230 are separated, and the butterfly valve core 230 and the sleeve-shaped first valve seat 210 are in contact with each other, and are in a planar sealing structure.
The needle-shaped second valve seat 220 is designed as a bellows structure, and the valve core can be protruded outwardly by an external force. The difficulty of helium gas sealing by the plane sealing structure is very high, the flatness and the surface roughness of the valve seat and the valve core are required to be ensured, and the helium gas medium can be effectively sealed. The needle-shaped second valve seat 220 has a small size, and the needle-shaped second valve seat 220 and the sleeve-shaped first valve seat 210 must be ground simultaneously in consideration of the sealing principle of the pilot operated safety valve, and the needle-shaped second valve seat 220 and the sleeve-shaped first valve seat 210 must be fixed. In view of this, as shown in fig. 2, the embodiment of the present disclosure provides a safety valve grinding apparatus 100 including a guide sleeve 110, a support sleeve 120, a fastener 130, and a grinding plate 140.
The supporting sleeve 120 is disposed on the polishing plate 140, the guiding sleeve 110 is sleeved in the supporting sleeve 120, and the supporting sleeve 120 supports and guides the guiding sleeve 110. Wherein, the first end of the first valve seat 210 is fixed to the first end of the guide sleeve 110, and the second end of the first valve seat 210 passes through the support sleeve 120 to contact with the polishing plate 140.
The fastener 130 is inserted into the second end of the guide sleeve 110 and abuts against the second valve seat 220 to adjust the expansion and contraction amount of the second valve seat 220, so that the sealing surface of the first valve seat 210 is flush with the sealing surface of the second valve seat 220.
Specifically, in this embodiment, the structure of the second valve seat 220 is bellows type, the bellows is in a contracted state when no external force acts, the second valve seat 220 is telescopically arranged above the first valve seat 210, a certain load is required to be applied to the top of the second valve seat 220 to enable the second valve seat 220 to extend, and the second valve seat automatically rebounds after the external force is removed. The fastener 130 abuts against the second valve seat 220, applies a pressure to the second valve seat 220, and expands toward the side of the polishing plate 140 under the pressure so that the sealing surface of the first valve seat 210 is flush with the sealing surface of the second valve seat 220.
The grinding plate 140 is used for synchronously grinding the sealing surface of the first valve seat 210 and the sealing surface of the second valve seat 220 when the guide sleeve 110 is rotated.
As shown in fig. 2 and 3, the safety valve grinding apparatus is assembled by inserting the needle-shaped second valve seat 220 inside the sleeve-shaped first valve seat 210. A sleeve-shaped first valve seat 210 is fitted into the guide sleeve 110. The fastener 130 is inserted into the guide sleeve 110, the bottom of the fastener 130 contacts the top of the second valve seat 220, and pressure is applied to the top of the second valve seat 220 by the fastener 130, so that the second valve seat 220 is elongated toward the polishing plate 140. The relative positions of the first valve seat 210 and the second valve seat 220 are adjusted by the fastener 130 such that the sealing surface of the first valve seat 210 is flush with the sealing surface of the second valve seat 220. The guide housing 110 and valve seat assembly are integrally disposed within the support housing 120. The support sleeve 120 is placed over the lapping plate 140, the outer edge of the fastener 130 is grasped by hand, the support sleeve 120 is used as a guide, the guide sleeve 110 is rotated integrally, and the sealing surface of the first valve seat 210 and the sealing surface of the second valve seat 220 are lapped synchronously.
According to the safety valve grinding device, the first valve seat is fixed through the set guide sleeve, the sealing surface of the first valve seat and the sealing surface of the second valve seat are adjusted to be flush through the fastener, the second valve seat is fixed, the sealing surface of the first valve seat and the sealing surface of the second valve seat are synchronously ground through rotating the guide sleeve, the grinding device can be well matched with the ground part of the safety valve, the external dimension is small, the operation is flexible and convenient, the problem that the first valve seat and the second valve seat cannot be effectively fixed during grinding is solved through the grinding device, the good grinding effect can be achieved, and the grinding stability and the grinding efficiency are high.
As shown in fig. 2 and 3, the polishing apparatus 100 further includes a locking member 150, where the locking member 150 is sleeved on the outer side of the fastening member 130 and is disposed on the top wall of the second end of the guide sleeve 110, so as to lock the fastening member 130, and fix the relative position between the fastening member 130 and the guide sleeve 110.
Specifically, the fastener 130 is inserted between the guide sleeves 110, the locking member 150 is sleeved outside the fastener 130, the position of the locking member 150 is adjusted after the sealing surface of the first valve seat 210 and the sealing surface of the second valve seat 220 are adjusted to be flush by the fastener 130, the fastener 130 is locked, and the relative position between the fastener 130 and the guide sleeve 110 is fixed.
As illustrated in fig. 2 and 3, in this embodiment, the fastening member 130 is a bolt, that is, the outer sidewall of the fastening member 130 is provided with an external thread 131, the inner sidewall of the second end of the guide sleeve 110 is provided with an internal thread (not shown) matching the external thread 131, and the fastening member 130 is screwed to the second end of the guide sleeve 110.
Specifically, the fastener 130 is screwed to the guide sleeve 110, the bellows structure of the second valve seat 220 is stretched by screwing the fastener 130, the bellows is stressed to be elongated, and when the bellows of the second valve seat 220 is elongated to a certain length, the sealing surfaces of the first valve seat 210 and the second valve seat 220 are in a flush state, so that grinding can be performed.
Since it is required to reduce the difference between the relative positions of the first valve seat 210 and the second valve seat 220 as much as possible, in order to achieve precise adjustment, the internal thread of the second end of the guide sleeve 110 and the external thread 131 of the fastener 130 are fine threads, which can increase the adjustment accuracy.
Accordingly, in the present embodiment, the locking member 150 is a locking nut, and the locking nut is screwed on the outer side of the bolt, so as to lock the bolt.
It should be noted that, as shown in fig. 3, the tightening and loosening of the fastener 130 is performed manually, a hob pattern is formed on the top of the fastener 130 to increase the friction force of the hand, and a lock nut is disposed on the external thread 131 of the fastener 130, so that when the position of the fastener 130 is determined, the fastener 130 is locked by the lock nut, so as to prevent the position of the fastener 130 from being changed during the grinding process. The lock nut may be locked using a special wrench 250.
Illustratively, as shown in FIG. 4, the first end of the guide sleeve 110 is provided with a first stepped structure 111, the first stepped structure 111 being snapped with a first end of the first valve seat 210. This allows guiding and supporting of the first valve seat 210 by the guide sleeve 110. Specifically, as shown in fig. 4, in the present embodiment, the first end of the guide sleeve 110 is provided as a concave hole, and the first end of the first valve seat 210 may be directly prevented from being fixed in the concave hole.
As illustrated in fig. 6 and 7, the inner sidewall of the support sleeve 120 is provided with a second step structure 121 and a third step structure 122 in order from an end facing the polishing plate 140 to an end facing away from the polishing plate 140. The second step structure 121 is provided with a second end of the first valve seat 210, and the third step structure 122 is provided with a first end of the guide sleeve 110, so as to fix the second end of the first valve seat 210 and the first end of the guide sleeve 110. That is, the shape of the inner sidewall of the support sleeve 120 is matched with the shape of the second end of the first valve seat 210 and the shape of the first end of the guide sleeve 110, and supports and guides the guide sleeve 110 and the first valve seat 210.
Illustratively, as shown in fig. 3 and 5, the end of the support sleeve 120 facing the grinding plate 140 is provided with a plurality of exhaust holes 123. The number of the air vents 123 is not particularly limited in this embodiment, and the plurality of air vents 123 may be equally spaced apart or non-equally spaced apart, and may be selected according to actual needs. The shape of the vent hole 123 is not particularly limited, and may be selected according to actual needs.
During grinding operation, the supporting sleeve 120 is placed above the grinding plate 140, because the gap between the outer side wall of the guiding sleeve 110 and the inner side wall of the supporting sleeve 120 is very small, when the guiding sleeve 110 is placed towards the supporting sleeve 120, because air exists inside the guiding sleeve 110 and the supporting sleeve 120, the air cannot be normally discharged, and therefore, the exhaust hole 123 is formed in the bottom of the supporting sleeve 120, so that the guiding sleeve 110 can be conveniently installed, and the internal compressed air can be discharged.
As shown in fig. 8, the embodiment of the disclosure provides a method S100 for polishing a safety valve, which uses the safety valve polishing device 100 described above, and the specific structure of the safety valve polishing device 100 is described in detail above, and will not be described here again.
The relief valve grinding method S100 specifically includes:
S110, fixing the first valve seat and the second valve seat through the grinding device, and adjusting the sealing surface of the first valve seat to be flush with the sealing surface of the second valve seat.
Specifically, as shown in fig. 2 and 3, a first end of the first valve seat 210 is fixed to a first end of the guide housing 110, and a second end of the first valve seat 210 is brought into contact with the polishing plate 140 through the support housing 120. The fastener 130 is inserted into the second end of the guide sleeve 110 and abuts the second valve seat 220 to adjust the amount of expansion and contraction of the second valve seat 220 such that the sealing surface of the first valve seat 210 is flush with the sealing surface of the second valve seat 220.
S120, checking the sealing surface of the first valve seat and the sealing surface of the second valve seat in advance.
Specifically, first, the appearance conditions of the sealing surfaces of the first valve seat 210 and the second valve seat 220 are observed under a high power microscope, and the distribution of defects of the sealing surfaces, such as scratches, pits, and the like of the sealing surfaces, is inspected.
And then, carrying out preliminary judgment on the grinding condition of the sealing surface, and judging that the grinding condition is not met if the defect depth of the sealing surface is more than 0.2 mm. That is, the polishing agent does not have a polishing repair value and needs to be replaced as a whole. If the defect depth defect of the sealing surface is less than or equal to 0.2mm, judging that the polishing conditions are met, and polishing.
And S130, if the grinding conditions are met, rotating the guide sleeve to sequentially perform rough grinding, fine grinding and polishing on the sealing surface of the first valve seat and the sealing surface of the second valve seat, and judging the surface roughness and the surface gloss of the sealing surface after each grinding.
Specifically, the specific process of rough grinding, fine grinding and polishing the sealing surface of the first valve seat 210 and the sealing surface of the second valve seat 220 sequentially by the rotary guide sleeve 110 is as follows:
First, sandpaper with a particle size range of 25 mu to 35 mu is fixed on the grinding plate 140, the guide sleeve 110 is rotated in the same direction, 15N to 20N pressure is applied to the second valve seat 220, and the sealing surface is coarsely ground.
And stopping grinding when grinding for 10 to 20 circles, judging the surface roughness and the surface gloss of the sealing surface, and stopping rough grinding if the micro scratches and pits of the sealing surface are eliminated, the sealing surface is grey-black and the surface gloss is consistent.
In this embodiment, the specific process of rough grinding is as follows:
The abrasive sheet 140 is attached with sandpaper having a particle size of 30 mu, and air bubbles at the bottom of the sandpaper should be completely discharged when the sandpaper is attached. The guide sleeve 110 is rotated and the guide sleeve 110 is pressed by the fastener 130 for about 15N to grind in the same direction.
The support sleeve 120 is held by one hand during grinding, the guide sleeve 110 is rotated by one hand, the grinding force is uniform during grinding, grinding is stopped every 10 to 20 circles, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, visual checking is performed firstly during checking, whether defects are visible or not are checked, the sealing surface of the first valve seat 210 and the sealing surface of the second valve seat 220 are placed under a high-power microscope for checking after visual checking, the appearance of the whole sealing surface is checked, the whole surface roughness of the sealing surface is consistent, and the next procedure can be carried out if the surface roughness is inconsistent, and grinding is continued until the surface roughness is consistent.
After rough grinding is carried out for a period of time, the sealing surface of the valve seat is placed under a high-power microscope for observation, and the defects such as micro scratches, pits and the like are eliminated after inspection, the external glossiness of the sealing surface of the valve seat is consistent, and the sealing surface is gray black, so that the rough grinding process can be stopped.
Secondly, after rough grinding is completed, sand paper with the granularity range of 15 mu to 20 mu is fixed on a grinding plate 140, the guide sleeve 110 is rotated in the same direction, 10N to 15N pressure is applied to the guide sleeve 110, and the sealing surface is finely ground.
And stopping grinding when grinding for 30 to 40 circles, judging the surface roughness and the surface gloss of the sealing surface, and stopping fine grinding if micro lines generated by grinding are uniformly distributed and have uniform depth, the sealing surface is basically bright, the surface gloss is basically uniform, and no darkening phenomenon exists locally.
In this embodiment, the detailed process of fine grinding is as follows:
The abrasive paper with the granularity of 15 mu is used in fine grinding, the grinding plate 140 is cleaned before new abrasive paper is replaced, the guide sleeve 110 is rotated, the second valve seat 220 is applied with about 10N pressure, grinding is carried out along the same direction, the support sleeve 120 is held by one hand in grinding, the guide sleeve 110 is rotated by one hand, the grinding force is uniform in grinding, grinding is stopped every 30-40 circles, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, the sealing surface of the first valve seat 210 and the sealing surface of the second valve seat 220 are placed under a high power microscope for checking, the appearance of the whole sealing surface is checked, the observation is carried out under a microscope, the surface roughness of the whole sealing surface is consistent, the distribution of grinded micro grains is uniform, the depth of the grains is uniform, and the next procedure can be carried out until the grinding is consistent.
After the valve seat sealing surface is finely ground for a period of time, the valve seat sealing surface is placed under a high-power microscope for observation, the valve seat sealing surface is comprehensively inspected, the sealing surface is basically bright, the surface glossiness is basically consistent, the phenomenon of darkening does not exist locally, the micro lines generated by grinding are uniformly distributed and have consistent depth, and then the fine grinding process can be stopped.
Secondly, after finishing the fine grinding, sand paper with a granularity ranging from 8 mu to 10 mu is fixed on the grinding plate 140, and the guide sleeve 110 is rotated, so that the sealing surface is accurately ground along the same direction without applying additional pressing force.
The grinding speed is 50-100 rpm, grinding is stopped after 2-3 min, the surface roughness and the surface gloss of the sealing surface are judged, if the sealing surface has no obvious grinding lines, the sealing surface is a bright surface, and the surface gloss is completely consistent, the fine grinding is stopped.
In this example, the specific process of refining is as follows:
During fine grinding, the abrasive paper with the granularity of 9 mu is used, the grinding plate 140 is cleaned up before new abrasive paper is replaced, the guide sleeve 110 is rotated, no additional pressing force is needed to be loaded, grinding is carried out along the same direction, the support sleeve 120 is held by one hand during grinding, the guide sleeve 110 is rotated by the other hand, the grinding is only carried out in the circumferential direction, the rotating speed can be properly increased, the rotating speed is controlled to be about 80 revolutions per minute, grinding is stopped after 2-3 minutes, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, the sealing surface of the valve seat is placed under a high-power microscope for checking the appearance of the whole sealing surface, the whole surface roughness of the sealing surface is consistent, no obvious grinding lines are generated, the surface glossiness is consistent, and the grinding can be carried out in the next working procedure if inconsistent until the surface is consistent.
After finishing grinding for a period of time, the valve seat sealing surface is placed under a high power microscope for observation, the valve seat sealing surface is comprehensively inspected, the sealing surface is a bright surface, the surface glossiness is completely consistent, no obvious grinding lines exist, and the finishing grinding process can be stopped.
Finally, after finishing the finish grinding, the abrasive paper with the granularity ranging from 1 mu to 5 mu is fixed on the grinding plate 140, and the guide sleeve 110 is rotated, so that the sealing surface is ground and polished along the same direction without applying additional pressing force.
The grinding speed is 100-150 rpm, the grinding is stopped after the grinding is performed for 5-6 min, the surface roughness and the surface gloss of the sealing surface are judged, and if the surface roughness is consistent, no grinding trace exists, the whole sealing surface is shiny, and the surface gloss is consistent, the grinding of the sealing surface is completed.
In this embodiment, the specific process of grinding and polishing is as follows:
The abrasive paper with granularity of 5 mu is used during polishing, the grinding plate 140 is cleaned up before new abrasive paper is replaced, the guide sleeve 110 is rotated, no additional pressing force is needed to be loaded, the grinding is carried out along the same direction, the support sleeve 120 is held by one hand during grinding, the guide sleeve 110 is rotated by the other hand, the force is only exerted in the circumferential direction during grinding, the rotating speed can be properly increased, the rotating speed is controlled to be about 100 revolutions per minute, after 5-6 minutes, grinding is stopped, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, the sealing surface of the valve seat is checked under a high power microscope, the appearance of the whole sealing surface is checked, the surface roughness of the whole sealing surface is consistent, the surface glossiness is consistent, the appearance of the sealing surface is wholly luminous, and no grinding trace is generated, and the grinding of the sealing surface is completed.
In the embodiment, the safety valve grinding device is adopted to grind the valve seat of the safety valve, so that the grinding process method and the grinding quality judging method of the upper three-way valve seat are provided, the grinding repair times can be effectively controlled, and the service life of equipment is prolonged.
It should be noted that, the valve core of the upper tee has smaller size and no clamping position, and is carried out by adopting a manual grinding mode, and the valve core grinding and repairing process method comprises the following steps:
1) Inspection before grinding
And 1, observing the appearance condition of the valve core sealing surface under a high-power microscope, and checking the distribution condition of defects such as scratches, pits and the like of the valve core sealing surface.
And 2, carrying out preliminary judgment on the grinding process, wherein when the depth of the defect above the valve core is more than 0.2mm, the valve core has no grinding and repairing value, the valve core needs to be replaced integrally, and when the defect is less than or equal to 0.2mm, the valve core can be subjected to grinding and repairing.
2) Grinding process
Step 1, rough grinding, namely adhering sand paper with granularity of 30 mu to a grinding plate, and completely discharging bubbles at the bottom of the sand paper when adhering the sand paper. The top of the valve core is pressed by an index finger, the pressure of about 20N is applied to the ground piece, the finger is rocked, and the valve core moves along with the finger. The motion track can be in an 8 shape or an envelope curve, the force is required to be evenly applied during grinding, grinding is required to be stopped every 10 to 20 circles, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, visual checking is performed firstly, whether macroscopic defects exist or not is checked, a valve core is placed under a high-power micro mirror for checking after visual checking, the appearance of the whole sealing surface is checked, the whole surface roughness of the sealing surface is mainly checked, the whole surface roughness of the sealing surface is consistent, and the next procedure can be carried out if the whole surface roughness of the sealing surface is inconsistent, and grinding is continued until the whole surface roughness is consistent.
And 2, grinding for a period of time according to the operation method of the step 1, and then placing the valve core sealing surface under a high-power microscope for observation, wherein defects such as micro scratches and pits are eliminated after inspection, the external glossiness of the valve core sealing surface is consistent, and the sealing surface is gray black, so that the rough grinding process can be stopped.
And 3, fine grinding, namely, using sand paper with the granularity of 15 mu during fine grinding, cleaning a grinding plate before replacing new sand paper, rotating a valve core, applying pressure of about 15N to the valve core, shaking a finger, and enabling the valve core to move along with the finger. The motion track can be in an 8 shape or an envelope curve, the force should be evenly applied during grinding, grinding should be stopped every 30 to 40 circles, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, the grinding part is placed under a high power microscope for checking, the appearance of the whole sealing surface is checked, the whole surface roughness of the sealing surface is observed under a microscope, the distribution of the grinded micro lines is even, the depth of the lines is even and consistent, and the next working procedure can be carried out if the depths are inconsistent, and the grinding is continued until the depths are consistent.
And 4, grinding for a period of time according to the operation method of the step 3, and then placing the valve core sealing surface under a high-power microscope for observation, and comprehensively checking the valve core sealing surface, wherein the sealing surface is basically bright, the surface glossiness is basically consistent, the phenomenon of local darkness does not occur, and the fine lines generated by grinding are uniformly distributed and have consistent depth, so that the fine grinding process can be stopped.
And 5, during fine grinding, sand paper with the granularity of 9 mu is used, the grinding plate is cleaned up before new sand paper is replaced, the valve core is rotated, the valve core is subjected to pressure of about 5N, fingers are rocked, and the valve core moves along with the fingers. The motion track can be in an 8 shape or an envelope curve, the force application during grinding is uniform, the rotating speed can be properly increased, the rotating speed is controlled to be about 60 revolutions per minute, the grinding is stopped after 2-3 minutes, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, the grinding part is placed under a high-power microscope for checking, the appearance of the whole sealing surface is checked, the whole surface roughness of the sealing surface is observed under a microscope, no obvious grinding lines exist, the surface glossiness is consistent, and the next procedure can be carried out if the surface roughness is inconsistent, and the grinding is continued until the surface roughness is consistent.
And 6, grinding for a period of time according to the operation method of the step 5, and then placing the valve core sealing surface under a high-power microscope for observation, fully checking the valve core sealing surface, wherein the sealing surface is a bright surface, the surface glossiness is completely consistent, and no obvious grinding lines exist, so that the fine grinding process can be stopped.
And 7, polishing by using sand paper with granularity of 5 mu, cleaning the polishing plate before replacing new sand paper, rotating the valve core and applying pressure of about 5N to the valve core, shaking the finger, and enabling the valve core to move along with the finger. The motion track can be in an 8 shape or an envelope curve, the force application during grinding is uniform, the rotating speed can be properly increased, the rotating speed is controlled to be about 100 revolutions per minute, the grinding is stopped after the rotating for 5 to 6 minutes, grinding scraps above the sealing surface are cleaned, the appearance condition of the sealing surface is checked, the valve core is placed under a high-power micro mirror for checking, the appearance of the whole sealing surface is checked, the surface roughness of the whole sealing surface is consistent, the surface glossiness is consistent, the appearance of the sealing surface is integrally shiny, and no processing trace exists.
It is to be understood that the above implementations are merely exemplary implementations employed to illustrate the principles of the disclosed embodiments, which are not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the embodiments of the disclosure, and these modifications and improvements are also considered to be within the scope of the embodiments of the disclosure.
Claims (8)
1. The grinding device of the safety valve comprises a valve seat and a valve core which are matched with each other, wherein the valve seat comprises a first valve seat and a second valve seat which is arranged in the first valve seat in a telescopic way;
The support sleeve is arranged on the grinding plate, the guide sleeve is sleeved in the support sleeve, the first end of the first valve seat is fixed at the first end of the guide sleeve, and the second end of the first valve seat passes through the support sleeve to be in contact with the grinding plate;
The fastener is inserted into the second end of the guide sleeve and is abutted against the second valve seat so as to adjust the expansion and contraction amount of the second valve seat, and the sealing surface of the first valve seat is flush with the sealing surface of the second valve seat;
The grinding plate is used for synchronously grinding the sealing surface of the first valve seat and the sealing surface of the second valve seat when the guide sleeve is rotated;
The locking device comprises a guide sleeve, and is characterized by further comprising a locking piece, wherein the locking piece is sleeved on the outer side of the fastener and arranged on the top wall of the second end of the guide sleeve, so as to lock the fastener, an external thread is arranged on the outer side wall of the fastener, an internal thread matched with the external thread is arranged on the inner side wall of the second end of the guide sleeve, and the fastener is in threaded connection with the second end of the guide sleeve.
2. The grinding apparatus defined in claim 1, wherein the first end of the guide sleeve is provided with a first step structure that snaps over the first end of the first valve seat.
3. The grinding device according to claim 1 or 2, wherein the inner side wall of the support sleeve is provided with a second step structure and a third step structure in sequence from one end facing the grinding plate to one end facing away from the grinding plate;
the second step structure card is equipped with the second end of first disk seat, the third step structure card is equipped with the first end of uide bushing.
4. A grinding apparatus as claimed in claim 1 or 2, wherein the support sleeve is provided with a plurality of vent holes at an end thereof facing the grinding plate.
5. A relief valve lapping method characterized by lapping with the relief valve lapping apparatus according to any one of claims 1 to 4, the method comprising:
fixing the first valve seat and the second valve seat through the grinding device, and adjusting the sealing surface of the first valve seat to be flush with the sealing surface of the second valve seat;
pre-inspecting the sealing surface of the first valve seat and the sealing surface of the second valve seat;
And if the grinding conditions are met, rotating the guide sleeve to sequentially perform rough grinding, fine grinding and polishing on the sealing surface of the first valve seat and the sealing surface of the second valve seat, and judging the surface roughness and the surface gloss of the sealing surface after each grinding.
6. The method of grinding according to claim 5, wherein said pre-inspecting the sealing surface of the first valve seat and the sealing surface of the second valve seat comprises:
Observing the appearance conditions of the sealing surface of the first valve seat and the sealing surface of the second valve seat under a high-power microscope, checking the distribution condition of defects of the sealing surfaces,
If the defect depth of the sealing surface is more than 0.2mm, judging that the grinding condition is not met;
and if the defect depth defect of the sealing surface is less than or equal to 0.2mm, judging that the grinding condition is met.
7. The lapping method of claim 5, wherein rotating the guide sleeve sequentially roughs, fine grinds, refines and polishes the sealing surface of the first valve seat and the sealing surface of the second valve seat, and evaluates the surface roughness and surface gloss of the sealing surface after each lapping, comprising:
Fixing sand paper with granularity ranging from 25 mu to 35 mu on the grinding plate, rotating the guide sleeve in the same direction, applying 15N-20N pressure to the second valve seat, and carrying out rough grinding on the sealing surface;
stopping grinding when grinding for 10 to 20 circles, judging the surface roughness and the surface gloss of the sealing surface, and stopping rough grinding if the micro scratches and pits of the sealing surface are eliminated, the sealing surface is grey black and the surface gloss is consistent;
After rough grinding is finished, sand paper with the granularity range of 15 mu to 20 mu is fixed on the grinding plate, the guide sleeve is rotated in the same direction, 10N to 15N pressure is applied to the second valve seat, and fine grinding is carried out on the sealing surface;
And stopping grinding when grinding for 30 to 40 circles, judging the surface roughness and the surface gloss of the sealing surface, and stopping fine grinding if micro lines generated by grinding are uniformly distributed and have consistent depth, the sealing surface is basically bright, the surface gloss is basically consistent, and no darkening phenomenon exists locally.
8. The lapping method of claim 7, wherein rotating the guide sleeve sequentially roughs, fine grinds, refines and polishes the sealing surface of the first valve seat and the sealing surface of the second valve seat, and evaluates the surface roughness and surface gloss of the sealing surface after each lapping, further comprising:
After finishing fine grinding, fixing sand paper with granularity ranging from 8 mu to 10 mu on the grinding plate, rotating the guide sleeve, and accurately grinding the sealing surface along the same direction without applying additional pressing force;
the grinding speed is 50-100 rpm, grinding is stopped after 2-3 min, the surface roughness and the surface gloss of the sealing surface are judged, if the sealing surface has no obvious grinding lines, the sealing surface is a bright surface, and the surface gloss is completely consistent, fine grinding is stopped;
After finishing fine grinding, fixing sand paper with granularity ranging from 1 mu to 5 mu on the grinding plate, rotating the guide sleeve, and grinding and polishing the sealing surface along the same direction without applying additional pressing force;
The grinding speed is 100-150 rpm, the grinding is stopped after the grinding is carried out for 5-6 min, the surface roughness and the surface gloss of the sealing surface are judged, and if the surface roughness is consistent, no grinding trace exists, the whole sealing surface is shiny, and the surface gloss is consistent, the grinding of the sealing surface is completed.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113967858A (en) * | 2021-11-03 | 2022-01-25 | 江苏核电有限公司 | Method and device for grinding sealing surface of valve for nuclear power station |
| CN116442013A (en) * | 2023-04-23 | 2023-07-18 | 华能山东石岛湾核电有限公司 | Safety valve grinding device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3925043A1 (en) * | 1988-08-26 | 1990-03-08 | Bosch Gmbh Robert | METHOD AND DEVICE FOR PRODUCING SEALING SURFACES ON VALVES |
| JP5183971B2 (en) * | 2007-05-31 | 2013-04-17 | 大陽日酸エンジニアリング株式会社 | Valve body polishing equipment |
| CN217317534U (en) * | 2021-12-28 | 2022-08-30 | 江苏斯尔邦石化有限公司 | Valve plane sealing surface grinding device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113967858A (en) * | 2021-11-03 | 2022-01-25 | 江苏核电有限公司 | Method and device for grinding sealing surface of valve for nuclear power station |
| CN116442013A (en) * | 2023-04-23 | 2023-07-18 | 华能山东石岛湾核电有限公司 | Safety valve grinding device and method |
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