CN114952277A - Mounting and online detection preventive maintenance method for locking disc spring cylinder - Google Patents
Mounting and online detection preventive maintenance method for locking disc spring cylinder Download PDFInfo
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- CN114952277A CN114952277A CN202210649085.0A CN202210649085A CN114952277A CN 114952277 A CN114952277 A CN 114952277A CN 202210649085 A CN202210649085 A CN 202210649085A CN 114952277 A CN114952277 A CN 114952277A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012423 maintenance Methods 0.000 title claims abstract description 11
- 230000003449 preventive effect Effects 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 title claims abstract description 7
- 238000009826 distribution Methods 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 230000007704 transition Effects 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000006835 compression Effects 0.000 claims abstract description 7
- 238000007906 compression Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012351 Integrated analysis Methods 0.000 description 1
- 241000251131 Sphyrna Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a locking disc spring cylinder installation and online detection preventive maintenance method, which is characterized in that after a locking disc spring cylinder assembly body, a locking disc spring cylinder and an oil distribution pressure plate which are prepared offline are assembled into a whole by bolts, the locking disc spring cylinder is installed along an installation hole by the oil distribution pressure plate in a parallel fastening mode; the measuring block is moved into the hook head of the locking cylinder, the vertical surface of the measuring block is ensured to be in close contact with the horizontal base plate and the vertical base plate, and the locking disc spring cylinder is moved to the hook head and the pre-locking surface of the measuring block for close fitting through the fixed connecting bolt of the locking disc spring cylinder and the oil distribution pressure plate; disassembling the oil distribution pressure plate, and measuring the height from the bottom end face of the locking cylinder to the matching installation face of the oil distribution pressure plate and the tool rest, wherein the height is marked as B; calculating to obtain the thickness delta H of the end cover gasket corresponding to the locking cylinder, wherein A is the stroke of the locking disc spring cylinder in a compression state at 170 bar; and taking out the measuring block, and loading the locking disc spring cylinder, the oil distribution pressing plate and the match grinding transition adjusting pressing plate into a sealing and fastening position.
Description
Technical Field
The invention belongs to the technical field of hot continuous rolling, and particularly relates to a locking disc spring cylinder installation and online detection preventive maintenance method.
Background
At present, a disc spring cylinder is a key execution unit for clamping and releasing important moving parts which are automatically controlled by setting oil pressure and releasing oil pressure, the cylinder head locking force of the disc spring cylinder is firm and reliable, and the disc spring cylinder is widely applied to various industries such as various machine tools, steel industry production lines (crank type flying shears, constant-width press hammer heads and the like) and the like.
The application has the advantages that: locking dish spring jar locking force is firm reliable, can thoroughly avoid similar pneumatic cylinder to reveal and lose the drawback that the locking force leads to the locking unstable, and the equipment that the product structure inspection was hardly operated by the manual operation improves work efficiency, and easy operation is reliable.
The working principle is as follows: the locking disc spring cylinder generates locking force meeting requirements after adjustment, the locking force is generated by an internal disc spring, and the conventional locking disc spring cylinder can select an oil supply mode through an oil supply pipe connected with a rodless cavity to overcome certain disc spring compression force to realize opening and closing of the cylinder head of the locking disc spring cylinder.
The prior art has the following defects:
1. the technical points of operation standardization are lost in the installation process, the installation is not standard, and the installation standard of the locking disc spring cylinder cannot be determined;
2. after the installation is finished, effective locking force cannot be applied to the locking workpiece, so that equipment failure is caused;
3. when a plurality of locking cylinders lock the same workpiece, the locking forces of the locking disc spring cylinders at different positions are inconsistent, so that the sudden locking disc spring cylinder fails, the integral locking force is insufficient, and the locking fails;
4. the online early-stage prediction of use failure cannot be tracked in the use process of the locking disc spring cylinder, so that equipment accidents occur;
5. the dish spring jar is because of the use operating mode, wherein flying shear dish spring jar mounting hole is inside to have got into impurity such as iron scale and water, leads to the locking force disappearance.
Disclosure of Invention
The invention aims to provide an online sealing device and method for a ladle cover oxygen-burning sand-filling observation hole.
The technical scheme adopted by the invention for solving the technical problems is as follows: a mounting method of a locking disc spring cylinder comprises a mounting preparation process and a mounting process;
the mounting process comprises the following steps: 1) after a locking disc spring cylinder assembly body, a locking disc spring cylinder and an oil distribution pressure plate which are prepared under the wire are assembled into a whole by bolts, the locking disc spring cylinder is installed along an installation hole by the oil distribution pressure plate in a parallel fastening mode;
2) the measuring block is moved into the hook head of the locking cylinder, the vertical surface of the measuring block is ensured to be in close contact with the horizontal base plate and the vertical base plate, and the locking disc spring cylinder is moved to the hook head and the pre-locking surface of the measuring block for close fitting through the fixed connecting bolt of the locking disc spring cylinder and the oil distribution pressure plate;
3) disassembling the oil distribution pressure plate, and measuring the height from the bottom end face of the locking cylinder to the matching installation face of the oil distribution pressure plate and the tool rest, wherein the height is marked as B;
4) calculating to obtain the thickness delta H of the end cover gasket corresponding to the locking cylinder, wherein A is the stroke of the locking disc spring cylinder in a compression state at 170 bar;
5) and (3) taking out the measuring block, repeating the step 1), and loading the locking disc spring cylinder, the oil distribution pressing plate and the match grinding transition adjusting pressing plate into a sealing and fastening position.
Specifically, the mounting preparation step:
1) the horizontal base plate and the vertical base plate which are contacted with the shear blade base are mutually vertical, and the shear blade mounting base surface is cleaned, polished and retested after each lining plate is mounted
2) Before operation, the flying shear is at a shear blade replacing position, a coupling between the motor and the speed reducer is locked by using a self-locking tool, and the oil distribution pressing plate, the match grinding transition adjusting pressing plate and the locking disc spring cylinder are taken out together with the locking hook head;
3) the outer oil distribution pressure plate and the matching surface of the tool rest, the locking hook head guide sleeve in the tool rest and the sealing matching surface of the locking disc spring cylinder are respectively installed on the positioning machine for processing, repairing and grinding;
4) checking the performance test of the locking disc spring cylinder under the line through a measuring block, and marking the stroke of the locking disc spring cylinder in a compression state at 170bar as A;
5) processing and manufacturing a measuring block of a locking cylinder, and preparing a match grinding pressure plate every 0.1-0.2mm of thickness of a match grinding transition adjusting pressure plate;
6) the locking disc spring cylinder and the locking hook head are installed and fastened in place under the line, the direction of a bolt hole at the rear end of the disc spring cylinder is consistent with that of a threaded hole installed behind the tool rest, and meanwhile, the locking hook head is consistent with a guiding and positioning key block in the horizontal base plate.
An online detection preventive maintenance method for a locking disc spring cylinder comprises the following steps:
1) after the cutting edge of the flying shear is pulled out, the opening pressure is kept at 240bar, and the distance between the locking hook head and the measuring block is measured in the opening state;
2) when the analysis is in a pressure maintaining state, the measurement gap is larger than 2.5mm, the disc spring inside the locking disc spring cylinder is reflected to be in a failure early stage or a failure state at present, a regular measurement and tracking data table is established, and the data statistics and analysis shows the failure distance of the disc spring group of the type, so that the purpose of preventive maintenance is achieved.
The invention has the following beneficial effects:
1) and confirming the operation rules of technical requirements in the installation process, and solidifying the installation standard of the locking disc spring cylinder.
2) Pre-applying a locking force and manufacturing oil pressure, stroke and locking force of a locking disc spring cylinder, and applying an effective locking force to a locking workpiece according to design requirements;
3) the problem that locking forces of locking disc spring cylinders at different positions are inconsistent when a plurality of locking cylinders lock the same workpiece is solved, the locking resultant force is improved, the locking effect is improved, and the service lives of the locking disc spring cylinders and relevant parts are prolonged;
4) through the preparation again of the specific position of locking by locking piece device, under the condition that is not dismantled by the retaining member, according to measuring result and the contrast of locking dish spring jar correction curve, can select preventive maintenance, avoid the equipment accident to enlarge.
5) Through improving the cylinder end structure that locking cylinder cooperation was used, stop outside water and impurity entering, improve equipment precision, guarantee locking dish spring jar locking force on line improves life.
Drawings
FIG. 1 is a flying shear assembly view.
Fig. 2 is a schematic view of an assembly structure of a locking disc spring cylinder and a shear blade of the flying shear.
Fig. 3 is a schematic structural view of a locking disc spring cylinder.
Fig. 4 is a schematic structural diagram of the calibration standard.
Fig. 5 is a schematic structural view of the lock cylinder.
FIG. 6 is a schematic diagram of the structure of the measurement block.
Fig. 7 is a schematic diagram of a structure of an actual measurement position.
FIG. 8 is a schematic view of a wear-distribution transition adjusting platen.
Fig. 9 is a schematic structural view of the locking hook.
In the figure: 1-flying shear memorial archways; 2-upper crankshaft; 3, mounting a tool rest; 4-lower crankshaft; 5-locking a disc spring cylinder; 6-oil separation pressing plate; 7-grinding and transiting to adjust the pressure plate; 8-locking the hook head; 9-horizontal backing plate; 10-vertical backing plate; 11-locking cylinder open state; 12-locking cylinder closed state; 13-a measuring block; 14-seal groove.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 9, a method for mounting a disc spring locking cylinder includes the following preparation steps:
(1) the shear blade base is ensured to be contacted with the horizontal base plate 9 and the vertical base plate 10 of the base plate to be vertical, the shear blade mounting base surface is cleaned, polished and retested after each lining plate is mounted, and the precision requirement below the shear blade line of the drawing process requirement is met;
(2) before operation, the flying shear is at a shear blade replacing position, a coupling between a motor and a speed reducer is locked by using a special self-locking tool to ensure safety and reliability, the special tool is manufactured according to a tool rest and a locking cylinder structure, and an oil distribution pressing plate 6, a match grinding transition adjusting pressing plate 7 and a locking disc spring cylinder 5 are taken out together with a locking hook 8;
(3) the outer oil distribution pressure plate 6 and the matching surface of the tool rest, the guide sleeve of the locking hook 8 in the tool rest, the sealing matching surface of the locking disc spring cylinder 5 and other installation positioning machines are machined, repaired and polished, and the design size precision requirement of a drawing is recovered;
(4) checking the performance test of the locking disc spring cylinder under the line according to the figure 6, wherein the stroke of the locking disc spring cylinder in a compression state at 170bar is marked as A;
(5) manufacturing a locking cylinder measuring block 13 according to a drawing, preparing a matched grinding pressure plate every 0.1-0.2mm of thickness by a matched grinding transition adjusting pressure plate 7(15-20mm), and saving matched grinding processing time;
(6) the locking disc spring cylinder 5 and the locking hook head 8 are installed and fastened in place under the wire, the bolt hole at the rear end of the disc spring cylinder is guaranteed to be consistent with the direction of the threaded hole installed behind the tool rest, and meanwhile, the locking hook head 8 is consistent with the guiding and positioning key block in the horizontal base plate 9.
Installation flow and technical points
(1) The locking disc spring cylinder assembly body, the locking disc spring cylinder 5 and the oil distribution pressure plate 6 which are prepared offline are assembled into a whole by using bolts (the thickness can be reduced and the size can be optimized by offline manufacturing so as to be convenient for quick installation), and then the locking disc spring cylinder 5 is assembled into a whole (the directions of oil ports at three positions of an oil inlet of the locking disc spring cylinder 5, an oil passage of the matched grinding transition adjusting pressure plate 7 and the oil distribution pressure plate 6 and effective standard installation of sealing can be better ensured), and the locking disc spring cylinder 5 is installed along the installation hole by using the oil distribution pressure plate 6 in a parallel fastening mode;
(2) the measuring block 13 is moved into the hook head 8 of the locking cylinder to ensure that the vertical surface of the measuring block 13 is tightly contacted with the horizontal base plate 9 and the vertical base plate 10, and the locking disc spring cylinder 5 is moved to the hook head 8 and the pre-locking surface of the measuring block 13 to be tightly attached together by using the fixed connecting bolts of the locking disc spring cylinder 5 and the oil distribution pressure plate 6;
(3) disassembling the oil distribution pressure plate 6, and measuring the height from the bottom end face of the locking cylinder to the matching installation surface of the oil distribution pressure plate 6 and the tool rest according to the graph shown in FIG. 7, wherein the height is marked as B;
(4) calculating the thickness delta H of the end cover gasket corresponding to the locking cylinder;
(5) and (3) taking out the measuring block 13 moved in the step (2), repeating the step (1), and loading the locking disc spring cylinder 5, the oil distribution pressure plate 6 and the match grinding transition adjusting pressure plate 7 into a sealing and fastening position.
On-line detection preventive maintenance method for locking disc spring cylinder
After flying shear cutting edge takes out, keep opening pressure 240bar state, use according to 8 locking shear cutting edge base size preparation measuring block 13 of locking eave tile, measure locking eave tile 8 and measuring block 13 distance when the open mode, integrated analysis measures the clearance when the pressurize state and is greater than 2.5mm, reflect 5 inside dish springs of locking dish spring jar and be in inefficacy earlier stage or inefficacy state at present, establish the periodic measurement tracking data table, data statistics analysis goes out this model dish spring group inefficacy distance, in order to reach preventive maintenance purpose. The key points of measurement are that the abrasion of the horizontal base plate 9 and the vertical base plate 10 meets the requirements, and meanwhile, the abrasion value of the locking cylinder hook 8 used for a long time is removed, so that the reality and later data analysis of data are achieved.
Improved structure of locking hook 8
Through to locking eave tile 8 configuration optimization, increase high temperature resistant sealed between eave tile and guide sleeve, as shown in fig. 9, stop to get into cylinder head cover guide gap because of water or iron scale, arouse that locking eave tile 8 receives the resistance and can't reach the locking force requirement, change the unable locking of opening of 240bar hydraulic pressure in the cutting edge process.
The present invention is not limited to the above embodiments, and any structural changes made by the teaching of the present invention can be made within the scope of the present invention, and all technical solutions similar or identical to the present invention are within the scope of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (3)
1. The mounting method of the locking disc spring cylinder is characterized by comprising a mounting preparation process and a mounting process;
the mounting process comprises the following steps: 1) after a locking disc spring cylinder assembly body, a locking disc spring cylinder and an oil distribution pressure plate which are prepared under the wire are assembled into a whole by bolts, the locking disc spring cylinder is installed along an installation hole by the oil distribution pressure plate in a parallel fastening mode;
2) the measuring block is moved into the hook head of the locking cylinder, the vertical surface of the measuring block is ensured to be in close contact with the horizontal base plate and the vertical base plate, and the locking disc spring cylinder is moved to the hook head and the pre-locking surface of the measuring block for close fitting through the fixed connecting bolt of the locking disc spring cylinder and the oil distribution pressure plate;
3) disassembling the oil distribution pressure plate, and measuring the height from the bottom end face of the locking cylinder to the matching installation face of the oil distribution pressure plate and the tool rest, wherein the height is marked as B;
4) calculating the thickness delta H of the end cover gasket corresponding to the locking cylinder as B-A, wherein A is the stroke of the locking disc spring cylinder in the compression state at 170 bar;
5) and (3) taking out the measuring block, repeating the step 1), and loading the locking disc spring cylinder, the oil distribution pressing plate and the match grinding transition adjusting pressing plate into a sealing and fastening position.
2. The mounting method of a locking disc spring cylinder according to claim 1, wherein the mounting preparation process comprises:
1) the horizontal base plate and the vertical base plate which are contacted with the shear blade base are mutually vertical, and the shear blade mounting base surface is cleaned, polished and retested after each lining plate is mounted
2) Before operation, the flying shear is at a shear blade replacing position, a coupling between the motor and the speed reducer is locked by using a self-locking tool, and the oil distribution pressing plate, the match grinding transition adjusting pressing plate and the locking disc spring cylinder are taken out together with the locking hook head;
3) the outer oil distribution pressure plate and the matching surface of the tool rest, the locking hook head guide sleeve in the tool rest and the sealing matching surface of the locking disc spring cylinder are respectively installed on the positioning machine for processing, repairing and grinding;
4) checking the performance test of the locking disc spring cylinder under the line through a measuring block, and marking the stroke of the locking disc spring cylinder in a compression state at 170bar as A;
5) processing and manufacturing a measuring block of a locking cylinder, and preparing a grinding pressure plate every 0.1-0.2mm of thickness of a grinding transition adjusting pressure plate;
6) the locking disc spring cylinder and the locking hook head are installed and fastened in place under the line, the direction of a bolt hole at the rear end of the disc spring cylinder is consistent with that of a threaded hole installed behind the tool rest, and meanwhile, the locking hook head is consistent with a guiding and positioning key block in the horizontal base plate.
3. An online detection preventive maintenance method for a locking disc spring cylinder is characterized by comprising the following steps:
1) after the cutting edge of the flying shear is pulled out, the opening pressure is kept at 240bar, and the distance between the locking hook head and the measuring block is measured in the opening state;
2) when the analysis is in a pressure maintaining state, the measurement gap is larger than 2.5mm, the disc spring inside the locking disc spring cylinder is reflected to be in a failure early stage or a failure state at present, a regular measurement and tracking data table is established, and the data statistics and analysis shows the failure distance of the disc spring group of the type, so that the purpose of preventive maintenance is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649085.0A CN114952277B (en) | 2022-06-09 | 2022-06-09 | Installation and online detection preventive maintenance method for locking disc spring cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649085.0A CN114952277B (en) | 2022-06-09 | 2022-06-09 | Installation and online detection preventive maintenance method for locking disc spring cylinder |
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| CN114952277A true CN114952277A (en) | 2022-08-30 |
| CN114952277B CN114952277B (en) | 2023-11-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016505A (en) * | 1989-12-14 | 1991-05-21 | Chapman Ward W | Spring return mechanism for flying shears |
| CN106270741A (en) * | 2016-08-29 | 2017-01-04 | 首钢京唐钢铁联合有限责任公司 | A kind of flying shear locking device and installation detection method thereof |
| CN111266650A (en) * | 2020-04-01 | 2020-06-12 | 中钢集团西安重机有限公司 | Method for replacing cutting edge of shearing machine |
| CN111347096A (en) * | 2020-04-01 | 2020-06-30 | 中钢集团西安重机有限公司 | Locking method and disc spring locking cylinder based on locking method |
-
2022
- 2022-06-09 CN CN202210649085.0A patent/CN114952277B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016505A (en) * | 1989-12-14 | 1991-05-21 | Chapman Ward W | Spring return mechanism for flying shears |
| CN106270741A (en) * | 2016-08-29 | 2017-01-04 | 首钢京唐钢铁联合有限责任公司 | A kind of flying shear locking device and installation detection method thereof |
| CN111266650A (en) * | 2020-04-01 | 2020-06-12 | 中钢集团西安重机有限公司 | Method for replacing cutting edge of shearing machine |
| CN111347096A (en) * | 2020-04-01 | 2020-06-30 | 中钢集团西安重机有限公司 | Locking method and disc spring locking cylinder based on locking method |
Non-Patent Citations (1)
| Title |
|---|
| 王卫军;刘文正;黄文锋;: "飞剪剪刃锁紧机构存在的问题及解决方案", 现代商贸工业, no. 22, pages 197 - 198 * |
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