CN113182976A - Special processing equipment for wedge sealing surface of valve body of wedge-top ball valve - Google Patents
Special processing equipment for wedge sealing surface of valve body of wedge-top ball valve Download PDFInfo
- Publication number
- CN113182976A CN113182976A CN202110737021.1A CN202110737021A CN113182976A CN 113182976 A CN113182976 A CN 113182976A CN 202110737021 A CN202110737021 A CN 202110737021A CN 113182976 A CN113182976 A CN 113182976A
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- Prior art keywords
- rod
- wedge
- rotating rod
- locking
- polishing
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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
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
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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
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
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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
The invention discloses special processing equipment for a wedge-shaped sealing surface of a valve body of a wedge-top type ball valve, which comprises: the fixing assembly is used for being connected with a flange plate of the ball valve body so as to fix the processing equipment on the ball valve body; the polishing assembly comprises a rotating rod and a plurality of polishing rollers, the rotating rod is rotatably arranged in the middle of the fixing assembly, the plurality of polishing rollers are symmetrically arranged on the periphery of the rotating rod, an included angle is formed between the polishing rollers and the rotating rod, and when the polishing rollers are in contact with the sealing surface and rotate around the axis of the rotating rod, the sealing surface can be polished; the driving piece is arranged on the fixing component and used for providing driving force required by the rotation of the rotating rod around the axis of the rotating rod. It is rotatory to drive the rotary rod through the driving piece, and then drives the roller of polishing rotatory to polish sealed face, and the subassembly structure law of polishing that rotary rod and the roller of polishing constitute is symmetrical, and then has higher precision of polishing.
Description
Technical Field
The invention belongs to the technical field of special processing equipment for a sealing surface, and particularly relates to special processing equipment for a wedge-shaped sealing surface of a valve body of a wedge-top type ball valve.
Background
The wedge top type ball valve is a ball valve in a top mounting mode, and has the advantages of convenience in replacement of a valve core and a sealing element of a top mounting fixed ball valve, time saving and labor saving.
Wherein in order to guarantee sealed stability, the slope of valve body inner wall sets up and forms the sealed face of wedge to make the contact of sealing member and sealed face can be inseparabler, sealed face need polish the processing, forms the smooth surface. For a generally cylindrical valve body, the sealing surface in the inner wall is conical.
Among the prior art, the common mode that adopts the turning is polished, and specific operation cup joints the valve body in the outside of polishing head for polishing head and the interior sealed face one side contact of valve body, then make the valve body rotate around sealed face axis at a high speed, make polishing head polish to conical sealed face.
However, because the structure of the valve body is not completely regular, it is difficult to accurately ensure that the valve body rotates around the axis of the sealing surface, and errors are easy to occur in the machining process.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides special processing equipment for a wedge-shaped sealing surface of a valve body of a wedge-top type ball valve.
The invention provides special processing equipment for a wedge-shaped sealing surface of a valve body of a wedge-top type ball valve, which comprises:
the fixing assembly is used for being connected with a flange plate of the ball valve body so as to fix the processing equipment on the ball valve body;
the polishing assembly comprises a rotating rod and a plurality of polishing rollers, the rotating rod is rotatably arranged in the middle of the fixing assembly, the plurality of polishing rollers are symmetrically arranged on the periphery of the rotating rod, an included angle is formed between the polishing rollers and the rotating rod, and when the polishing rollers are in contact with the sealing surface and rotate around the axis of the rotating rod, the sealing surface can be polished;
the driving piece is arranged on the fixing component and used for providing driving force required by the rotation of the rotating rod around the axis of the rotating rod.
As another technical solution, the fixing assembly includes a fixing plate and a bolt, mounting holes are provided at two ends of the fixing plate for fitting the bolt, one end of the rotating rod is rotatably disposed in the middle of the fixing plate through a bearing, and the driving member is fixedly disposed in the middle of the fixing plate.
As another technical scheme, the driving member is a driving motor, and an output shaft of the driving motor is connected with the rotating shaft through a coupler.
As another technical solution, the polishing assembly further includes a connecting member and a mounting rod, one end of the connecting member is fixedly connected to the rotating rod, the other end of the connecting member is fixedly connected to the mounting rod, the mounting rod is parallel to the polishing roller, and the polishing roller is fixedly disposed outside the mounting rod away from the rotating rod.
As another technical scheme, the connecting piece comprises telescopic link and the first piece that resets, the telescopic link with the rotary rod sets up perpendicularly, both ends respectively with rotary rod and installation pole fixed connection, the first piece that resets set up in the rotary rod with between the installation pole, be used for to the installation pole is applyed the effort that resets towards the rotary rod.
As another technical scheme, the first reset piece is a spring rod, the spring rod is parallel to the telescopic rod, and two ends of the spring rod are respectively and fixedly connected with the rotary rod and the mounting rod.
As another technical scheme, the telescopic rod is composed of a connecting pipe and a connecting rod, the inner end of the connecting pipe is fixedly connected with the rotary rod, the outer end of the connecting rod is fixedly connected with the mounting rod, the inner end of the connecting rod is inserted into the outer end of the connecting pipe, the outer end of the connecting pipe is provided with a first locking position, the inner end of the connecting rod is provided with a second locking position, when the first locking position and the second locking position are overlapped, the connecting pipe is locked with the connecting rod, and the locking effect is only effective when the rotary rod rotates.
As another technical proposal, the telescopic rod also comprises a mounting block, a mounting pipe and a locking block, the mounting block is integrally arranged on the side wall of the end part of the connecting pipe, a locking cavity communicated with the inside of the connecting pipe is arranged inside the mounting block, a cavity opening of the locking cavity is positioned on the inner wall of the connecting pipe to form the first locking position, the locking cavity is internally provided with a locking block in a sealing way, the locking block can at least partially extend into the connecting pipe to form a locking part, the connecting rod is provided with a locking groove matched with the locking part, the locking groove forms the second locking position, one end of the mounting pipe is fixedly connected with the mounting block, and with the sealed intercommunication of locking chamber, it has first piston to slide configuration in the installation pipe, first piston through the second reset with the rotary rod is connected, the second reset the piece and be used for providing the effort of restoring to the throne of orientation rotary rod to first piston.
The invention has the following characteristics:
1. the processing equipment polishes a sealing surface by driving a polishing roller to rotate through a rotating rod, and a polishing assembly formed by the rotating rod and the polishing roller is symmetrical in structural rule, so that higher polishing precision is achieved;
2. by adopting the telescopic connecting piece, the device can be used for a ball valve body with the port caliber smaller than the internal caliber; in a non-use state, the connecting piece is short, so that a user can conveniently extend the polishing assembly into the ball valve body; in a use state, the connecting piece automatically extends, so that the grinding roller is contacted with the sealing surface to realize grinding;
3. in the use, the length extension of connecting piece just has the effect of automatic locking length for grinding roller and sealed face stable contact, after the use, the length locking effect of connecting piece is automatic to be relieved, thereby the length of connecting piece can shorten automatically, does not need the length locking effect of manual control switching connecting piece.
Drawings
FIG. 1 is a schematic view showing a first three-dimensional structure of a special processing device for a wedge-shaped sealing surface of a valve body of a wedge-top ball valve, according to the present invention;
FIG. 2 is a schematic diagram of a second three-dimensional structure of the special processing equipment for the wedge-shaped sealing surface of the valve body of the wedge-top ball valve provided by the invention;
FIG. 3 is an enlarged view of the structure at A in FIG. 2;
FIG. 4 is a schematic plane structure diagram of a special processing device for a wedge-shaped sealing surface of a valve body of a wedge-top ball valve, which is provided by the invention;
FIG. 5 is a partial schematic structural view of a special processing device for a wedge-shaped sealing surface of a valve body of a wedge-top ball valve, which is provided by the invention;
fig. 6 is an enlarged view of the structure at B in fig. 5.
Detailed Description
Referring to fig. 1-6, a special processing equipment for wedge sealing surface of valve body of wedge-top ball valve, the processing equipment includes:
the fixing assembly is used for being connected with a flange plate of the ball valve body so as to fix the processing equipment on the ball valve body;
the polishing assembly comprises a rotating rod 4 and a plurality of polishing rollers 8, the rotating rod 4 is rotatably arranged in the middle of the fixing assembly, the plurality of polishing rollers 8 are symmetrically arranged on the peripheral side of the rotating rod 4 and form included angles with the rotating rod 4, and when the polishing rollers 8 are in contact with the sealing surface and rotate around the axis of the rotating rod 4, the sealing surface can be polished;
and the driving part 2, the driving part 2 is arranged on the fixed component and is used for providing the driving force required by the rotation of the rotating rod 4 around the axis thereof.
In the embodiment applying the technical scheme, the preset included angle between the grinding roller 8 and the rotating rod 4 corresponds to the included angle between the sealing surface in the ball valve body and the axis of the valve body, and different processing equipment is selected for different ball valve bodies; when the ball valve is used, a polishing assembly in machining equipment extends into a ball valve body, so that the rotating rod 4 is positioned on the axis of the valve body, the polishing roller 8 is in contact with a sealing surface, the fixing assembly is fixedly connected with a flange, and the position of the machining equipment is further fixed; then, the driving piece 2 drives the rotating rod 4 to rotate at a high speed, so that the plurality of grinding rollers 8 rotate around the axis of the rotating rod 4 at a high speed, and further the conical sealing surface is ground;
this processing equipment drives the rotary rod 4 rotatory through driving piece 2, and then drives and beats the rotation of grinding roller 8 and polish sealed face, and the subassembly structure law symmetry of polishing that rotary rod 4 and grinding roller 8 constitute, and then has higher precision of polishing.
According to the preferable technical scheme in the embodiment, the fixing assembly comprises a fixing plate 1 and bolts 3, mounting holes matched with the bolts 3 are formed in two ends of the fixing plate 1, one end of a rotating rod 4 is rotatably arranged in the middle of the fixing plate 1 through a bearing, and a driving piece 2 is fixedly arranged in the middle of the fixing plate 1; in the specific embodiment, the mounting holes at the two ends of the fixing plate 1 correspond to the flange holes, and the fixing plate 1 is fixedly mounted on the flange through the bolts 3.
In the preferred technical scheme in the embodiment, the driving part 2 is a driving motor, and an output shaft of the driving motor is connected with the rotating shaft through a coupler; concretely, through driving motor, drive rotary rod 4 high-speed rotatory, realize the function of polishing.
In the preferred technical scheme of the embodiment, the polishing assembly further comprises a connecting piece and a mounting rod 7, one end of the connecting piece is fixedly connected with the rotating rod 4, the other end of the connecting piece is fixedly connected with the mounting rod 7, the mounting rod 7 is parallel to the polishing roller 8, and the polishing roller 8 is fixedly arranged on the outer side, far away from the rotating rod 4, of the mounting rod 7; in the specific implementation, the grinding roller 8 is arranged on the outer side of the rotating rod 4 by arranging the connecting piece and the mounting rod 7, wherein the grinding roller 8 and the mounting rod 7 can be detachably connected, so that the grinding roller 8 is convenient to replace;
in the preferred technical scheme of the embodiment, the connecting member is composed of a telescopic rod and a first resetting member 9, the telescopic rod is perpendicular to the rotary rod 4, two ends of the telescopic rod are respectively fixedly connected with the rotary rod 4 and the mounting rod 7, and the first resetting member 9 is arranged between the rotary rod 4 and the mounting rod 7 and is used for applying a resetting acting force towards the rotary rod 4 to the mounting rod 7; in the specific embodiment, in the unopened state of the device, the telescopic rod is in the contracted state due to the restoring acting force of the first restoring piece 9, and the grinding roller 8 is in a position closer to the rotating rod 4; when the rotating rod 4 drives the grinding roller 8 to rotate at a high speed, the grinding roller 8 has an outward centrifugal force, so that the first resetting piece 9 is stretched, the telescopic rod is in an extending state, and the grinding roller 8 is located at a position far away from the rotating rod 4; by adopting the connecting piece with the structure, the equipment can be used for a ball valve body with a port caliber smaller than the internal caliber, the grinding roller 8 is closer to the rotating rod 4 before use, so that a user can conveniently stretch the grinding assembly into the ball valve body, but the grinding roller 8 is not contacted with a sealing surface at the moment, but after the rotating rod 4 rotates at a high speed, the grinding roller 8 moves outwards until being contacted with the sealing surface;
wherein, first piece 9 that resets is the spring beam, and the spring beam is parallel with the telescopic link, and both ends respectively with rotary rod 4 and installation pole 7 fixed connection.
In the preferred technical scheme in the embodiment, the telescopic rod is composed of a connecting pipe 5 and a connecting rod 6, the inner end of the connecting pipe 5 is fixedly connected with the rotary rod 4, the outer end of the connecting rod 6 is fixedly connected with the mounting rod 7, the inner end of the connecting rod is inserted into the outer end of the connecting pipe 5, the outer end of the connecting pipe 5 is provided with a first locking position, the inner end of the connecting rod 6 is provided with a second locking position, when the first locking position is superposed with the second locking position, the connecting pipe 5 is locked with the connecting rod 6, and the locking effect is only effective when the rotary rod 4 rotates; in this embodiment, when the rotary rod 4 is highly rotatory, because centrifugal force connecting rod 6 moves to the outside for connecting pipe 5, until first locking position and second locking position coincidence, when both coincided, connecting rod 6 and connecting pipe 5's position locking, and then the length of telescopic link is fixed, make the rigidity of grinding roller 8, thereby make at the in-process of polishing, grinding roller 8 is stable with sealed direct contact pressure of face, treat that the work of polishing is accomplished the back, rotary rod 4 stall, locking effect cancellation between first locking position and the second locking position, under the effect of first piece 9 that resets, connecting rod 6 receives in connecting pipe 5.
In the preferred technical scheme of the embodiment, the telescopic rod further comprises an installation block 10, an installation tube 11 and a locking block 15, the installation block 10 is integrally arranged on the side wall of the end portion of the connecting tube 5, a locking cavity 14 communicated with the inside of the connecting tube 5 is arranged inside the installation block 10, the opening of the locking cavity 14 is located on the inner wall of the connecting tube 5 to form a first locking position, the locking block 15 is hermetically arranged in the locking cavity 14, the locking block 15 can at least partially extend into the connecting tube 5 to form a locking portion 18, a locking groove 17 matched with the locking portion 18 is arranged on the connecting rod 6, the locking groove 17 forms a second locking position, one end of the installation tube 11 is fixedly connected with the installation block 10, and is communicated with the locking cavity 14 in a sealing way, a first piston 12 is arranged in the mounting tube 11 in a sliding way, the first piston 12 is connected with the rotating rod 4 through a second resetting piece 13, and the second resetting piece 13 is used for providing a resetting acting force towards the rotating rod 4 for the first piston 12;
in this embodiment, specifically, the locking block 15 is completely located in the locking cavity 14 in the initial state, when the rotating rod 4 rotates at a high speed, the first piston 12 has a movement tendency of moving outward, and further, the locking block 15 has a movement tendency of protruding into the connecting pipe 5 through air pressure transmission, along with the sliding of the connecting rod 6, when the locking groove 17 is opposite to the locking block 15, the locking block 15 will snap into the locking groove 17, and then the locking part 18 is engaged with the locking groove 17 to lock the relative position between the connecting rod 6 and the connecting pipe 5; when the rotation lever 4 stops rotating, the first piston 12 is reset by the second reset element 13, and the locking block 15 is received in the locking groove 17, so that the locking effect between the connecting tube 5 and the connecting rod 6 is cancelled.
Wherein, the second reset piece 13 is a linear spring; the inner end of the locking block 15 is fixedly connected with a second piston 16, and the second piston 16 is arranged in the locking cavity 14 in a sliding sealing mode so as to realize sliding sealing contact between the locking block 15 and the locking cavity 14.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a special processing equipment of wedge sealed face of wedge top formula ball valve body which characterized in that, processing equipment includes:
the fixing assembly is used for being connected with a flange plate of the ball valve body so as to fix the processing equipment on the ball valve body;
the polishing assembly comprises a rotating rod (4) and a plurality of polishing rollers (8), the rotating rod (4) is rotatably arranged in the middle of the fixed assembly, the plurality of polishing rollers (8) are symmetrically arranged on the peripheral side of the rotating rod (4) and form a preset included angle with the rotating rod (4), and when the polishing rollers (8) are in contact with a sealing surface and rotate around the axis of the rotating rod (4), the sealing surface can be polished;
the driving piece (2) is arranged on the fixing component and used for providing driving force required by the rotation of the rotating rod (4) around the axis of the rotating rod;
the polishing assembly further comprises a connecting piece and a mounting rod (7), one end of the connecting piece is fixedly connected with the rotating rod (4), the other end of the connecting piece is fixedly connected with the mounting rod (7), the mounting rod (7) is parallel to the polishing roller (8), and the polishing roller (8) is fixedly arranged on the outer side, far away from the rotating rod (4), of the mounting rod (7);
the connecting piece comprises telescopic link and the first piece (9) that resets, the telescopic link with rotary rod (4) set up perpendicularly, both ends respectively with rotary rod (4) and installation pole (7) fixed connection, first piece (9) that resets set up in rotary rod (4) with between installation pole (7), be used for to installation pole (7) are applyed the effort that resets towards rotary rod (4).
2. The special processing equipment for the wedge-shaped sealing surface of the valve body of the wedge-top type ball valve according to claim 1, wherein the fixing assembly comprises a fixing plate (1) and bolts (3), mounting holes for matching the bolts (3) are formed in two ends of the fixing plate (1), one end of the rotating rod (4) is rotatably arranged in the middle of the fixing plate (1) through a bearing, and the driving piece (2) is fixedly arranged in the middle of the fixing plate (1).
3. The special processing equipment for the wedge-shaped sealing surface of the valve body of the wedge-top type ball valve according to claim 1, wherein the driving piece (2) is a driving motor, and an output shaft of the driving motor is connected with the rotating rod (4) through a coupler.
4. The special processing equipment for the wedge-shaped sealing surface of the valve body of the wedge-top type ball valve according to claim 1, wherein the first resetting piece (9) is a spring rod, the spring rod is parallel to the telescopic rod, and two ends of the spring rod are respectively fixedly connected with the rotating rod (4) and the mounting rod (7).
5. The special processing equipment for the wedge-shaped sealing surface of the valve body of the wedge-top type ball valve according to claim 1, wherein the telescopic rod is composed of a connecting pipe (5) and a connecting rod (6), the inner end of the connecting pipe (5) is fixedly connected with the rotating rod (4), the outer end of the connecting rod (6) is fixedly connected with the mounting rod (7), the inner end of the connecting rod is inserted into the outer end of the connecting pipe (5), the outer end of the connecting pipe (5) is provided with a first locking position, the inner end of the connecting rod (6) is provided with a second locking position, when the first locking position is overlapped with the second locking position, the connecting pipe (5) is locked with the connecting rod (6), and the locking effect is only effective when the rotating rod (4) rotates.
6. The special processing equipment for the wedge-shaped sealing surface of the valve body of the wedge-top type ball valve according to claim 5, wherein the telescopic rod further comprises a mounting block (10), a mounting pipe (11) and a locking block (15), the mounting block (10) is integrally arranged on the side wall of the end part of the connecting pipe (5), a locking cavity (14) communicated with the inside of the connecting pipe (5) is arranged inside the mounting block (10), the opening of the locking cavity (14) is positioned on the inner wall of the connecting pipe (5) to form the first locking position, the locking block (15) is arranged in the locking cavity (14) in a sealing mode, the locking block (15) can at least partially extend into the connecting pipe (5) to form a locking part (18), a locking groove (17) matched with the locking part (18) is arranged on the connecting rod (6), and the locking groove (17) forms the second locking position, installation pipe (11) one end with installation piece (10) fixed connection, and with locking chamber (14) sealed intercommunication, it disposes first piston (12) to slide in installation pipe (11), first piston (12) through the second reset piece (13) with rotary rod (4) are connected, the second resets piece (13) and is used for providing the effort that resets towards rotary rod (4) to first piston (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110737021.1A CN113182976B (en) | 2021-06-30 | 2021-06-30 | Special processing equipment for wedge sealing surface of valve body of wedge-top ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110737021.1A CN113182976B (en) | 2021-06-30 | 2021-06-30 | Special processing equipment for wedge sealing surface of valve body of wedge-top ball valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113182976A true CN113182976A (en) | 2021-07-30 |
| CN113182976B CN113182976B (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110737021.1A Active CN113182976B (en) | 2021-06-30 | 2021-06-30 | Special processing equipment for wedge sealing surface of valve body of wedge-top ball valve |
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| Country | Link |
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| CN (1) | CN113182976B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1793308A (en) * | 1930-01-16 | 1931-02-17 | Parl O Eckels | Valve grinder |
| JPH09192998A (en) * | 1996-01-17 | 1997-07-29 | Nishi Nippon Plant Kogyo Kk | Valve seat lapping device |
| KR20010061065A (en) * | 1999-12-28 | 2001-07-07 | 김형국 | Working and grinding tool of valve seat |
| CN111306315A (en) * | 2020-02-27 | 2020-06-19 | 阀毕威阀门有限公司 | Ball valve and processing equipment thereof |
| CN211565541U (en) * | 2020-02-21 | 2020-09-25 | 浙江三方控制阀股份有限公司 | Floating ball core grinding tool clamp |
| CN213054109U (en) * | 2020-09-14 | 2021-04-27 | 华能武汉发电有限责任公司 | Portable high-low side valve grinding machine |
-
2021
- 2021-06-30 CN CN202110737021.1A patent/CN113182976B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1793308A (en) * | 1930-01-16 | 1931-02-17 | Parl O Eckels | Valve grinder |
| JPH09192998A (en) * | 1996-01-17 | 1997-07-29 | Nishi Nippon Plant Kogyo Kk | Valve seat lapping device |
| KR20010061065A (en) * | 1999-12-28 | 2001-07-07 | 김형국 | Working and grinding tool of valve seat |
| CN211565541U (en) * | 2020-02-21 | 2020-09-25 | 浙江三方控制阀股份有限公司 | Floating ball core grinding tool clamp |
| CN111306315A (en) * | 2020-02-27 | 2020-06-19 | 阀毕威阀门有限公司 | Ball valve and processing equipment thereof |
| CN213054109U (en) * | 2020-09-14 | 2021-04-27 | 华能武汉发电有限责任公司 | Portable high-low side valve grinding machine |
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| Publication number | Publication date |
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| CN113182976B (en) | 2021-08-31 |
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