CN101344169A - Long-stroke pneumatic hydraulic cylinder body and its processing method - Google Patents
Long-stroke pneumatic hydraulic cylinder body and its processing method Download PDFInfo
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- CN101344169A CN101344169A CNA2008101205376A CN200810120537A CN101344169A CN 101344169 A CN101344169 A CN 101344169A CN A2008101205376 A CNA2008101205376 A CN A2008101205376A CN 200810120537 A CN200810120537 A CN 200810120537A CN 101344169 A CN101344169 A CN 101344169A
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- 238000003672 processing method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims abstract description 4
- 230000000171 quenching effect Effects 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 239000004575 stone Substances 0.000 claims description 34
- 229910003460 diamond Inorganic materials 0.000 claims description 14
- 239000010432 diamond Substances 0.000 claims description 14
- 229910001651 emery Inorganic materials 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 241000272161 Charadriiformes Species 0.000 claims description 7
- BQYJATMQXGBDHF-UHFFFAOYSA-N difenoconazole Chemical compound O1C(C)COC1(C=1C(=CC(OC=2C=CC(Cl)=CC=2)=CC=1)Cl)CN1N=CN=C1 BQYJATMQXGBDHF-UHFFFAOYSA-N 0.000 claims description 7
- 238000003763 carbonization Methods 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 238000005553 drilling Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The invention discloses a long-stroke pneumatic hydraulic cylinder body which includes an outer cylinder body and an inner cylinder body which are made of circular steel pipes; the middle part of the outer cylinder body has an oil through which is communicated with the hydraulic cavity of the pneumatic cylinder body; the pneumatic hydraulic cylinder body is characterized in that the inner wall surfaces of the outer cylinder body and the inner cylinder body are respectively provided with grids which can store oil and lead the outer cylinder body and the inner cylinder body to keep long-time lubrication, reduce wear and prolong service life although the grids are tiny. The processing method of the outer cylinder body is as follows: a. fetching a seamless precision steel pipe with the specification of inner hole diameter of 15<-0.07><-0.10>mm, and length of 400 mm; b. using a lathe for turning both ends flat, and heat treatment quenching and tempering stereotype; c. using honing roughing, grinding the inner hole diameter up to be 15<-0.02><-0.03>mm; d. using a mandrel for sheathing the inner hole, using an excircle grinder for grinding the excircle, requesting concentricity; e. using a CNC lathe for cutting the oil through; f. carbonation treatment: enabling the depth up to be more than 0.05 mm; and g. adopting honing finishing so as to lead the finish to be about 0.05 mm and the straightness to be 400/0.01 mm, and the roundness to be controlled as 0.002 mm, and lead the inner wall surface of the steel pipe to form small grids.
Description
Technical field
The present invention relates to pneumatic hydraulic cylinder, be specifically related to the cylinder body of pneumatic hydraulic cylinder, with and the processing method of cylinder body and the equipment that is used to process, belong to mechanical manufacturing field.
Background technique
Adopting drilling machine automatic drilling or lathe, milling machine etc. to add man-hour needs slowly stablizes feed speed and advances, in order to achieve the above object, usually on relevant processing mechanism or equipment, dispose speed regulator (or claiming damper), guarantee feed speed as control unit with speed regulator.Speed regulator generally adopts cylinder and oil hydraulic cylinder linkage structure, utilize air pressure to come the pressure and then the regulator solution cylinder pressure piston movement speed of regulator solution cylinder pressure, concrete structure as the disclosed speed regulator of Chinese patent ZL 200620107542.X is: as shown in Figure 3, comprise the oil hydraulic cylinder 1 of interlock ' and cylinder 2 ', the outer cylinder body 11 of oil hydraulic cylinder ' in be equipped with inner cylinder body 12 ', outer cylinder body 11 ' one in be equipped with valve body 13 ' with inner cylinder body 12 ' contact, valve body 13 ' in have spool 14 ', spool valve body rotation relatively, valve body 13 ' and spool 14 ' between form meniscate groove, valve body 13 ' on be provided with the oilhole 15 that is connected with groove when rotated ', oilhole be communicated with inner cylinder body 12 ' and the hydraulic pressure cavity 21 of cylinder ', hydraulic pressure cavity through cylinder piston 22 ' with air-inlet cavity 23 ' be separated by, spool 14 ' through spring 16 ' connection piston 17 ', piston be installed in inner cylinder body 12 ' outlet, be equipped with in one of piston one-way valve 18 ', other end connection piston rod 19 ', piston rod be shaped on through hole 191 ', through hole be communicated with the hydraulic pressure cavity 21 of cylinder ' and one-way valve 18 '.But the oil hydraulic cylinder outer cylinder body endoporus of speed regulator (or claiming damper) is smaller, is generally 15 millimeters of diameters, adopts the effective travel N that conventional method processed to have only 100 millimeter, is difficult to reach more than 150 millimeters, and using scope is restricted; And speed regulator is in the frequent operation state, because the inner wall surface of inner cylinder body and outer cylinder body is smooth, holds oily ability, and it is big to cause rubbing in the cylinder, makes piston, seal ring etc. be easy to wearing and tearing, and working life is short.
Summary of the invention
The objective of the invention is provides a kind of effective travel of speed regulator that makes to reach more than 150 millimeters in order to overcome the shortcoming that prior art exists, and enlarges using scope; And change the outer cylinder body of oil hydraulic cylinder and the inner wall structure of inner cylinder body, keep lubricated in the cylinder, reduce the wearing and tearing of piston, seal ring etc., improve the long-stroke pneumatic hydraulic cylinder body in working life.
It is 15 millimeters that two of purpose of the present invention provides a kind of production diameter, long 400 millimeters outer cylinder body, and with the supporting inner cylinder body of outer cylinder body, and make effective travel reach the processing method of 160～250 millimeters long-stroke pneumatic hydrodynamic governor cylinder body.
Three of purpose of the present invention provides more than one outer cylinder bodies and the required process equipment of inner cylinder body.
The technological scheme of long-stroke pneumatic hydraulic cylinder body of the present invention is: comprise outer cylinder body and the inner cylinder body made by round steel pipe, the middle part of outer cylinder body is shaped on oil through, oil through communicates with the hydraulic pressure cavity of cylinder block, it is characterized in that the inner wall surface of described outer cylinder body and inner cylinder body is shaped on grid separately.
Long-stroke pneumatic hydraulic cylinder body of the present invention, because the inner wall surface of outer cylinder body and inner cylinder body is shaped on grid separately, though grid is small, can hold oil in the grid, make outer cylinder body and inner cylinder body keep lubricated for a long time, reduce the wearing and tearing of piston, seal ring etc. greatly, increase the service life, and reduce the heat that produces because of wearing and tearing.
Long-stroke pneumatic hydraulic cylinder body of the present invention, the length of its described outer cylinder body is 400 millimeters, the endoporus aperture is 15 millimeters, outer cylinder body is 160～250 millimeters with effective travel N after inner cylinder body cooperates, the effective travel that is piston rod is 160～250 millimeters, that is to say and to realize that drilling depth reaches 160～250 millimeters, enlarge using scope, solved prior art and can not process technical barrier greater than deep hole more than 100 millimeters.
The processing method of long-stroke pneumatic hydraulic cylinder body is characterized in that the processing method of outer cylinder body is:
A, to get specification be endoporus aperture 15
-0.07 -0.10Millimeter, long 400 millimeters seamless precision steel pipe;
B, employing lathe cutting end flat, the heat treatment quenching and tempering typing;
C, employing honing roughing, mill endoporus aperture reaches 15
-0.02 -0.03Millimeter;
D, overlap endoporus, use the external cylindrical grinding machine cylindrical grinding, require concentricity with plug;
E, cut oil through with numerically controlled lathe;
F, carbonization treatment: make the degree of depth more than 0.05 millimeter;
G, employing honing fine finishing reach about 0.05 micron degree of finish, and straightness accuracy reaches 400/0.01 millimeter, and circularity is controlled at 0.002 millimeter, and the steel pipe inner wall surface forms tiny grid.
The processing method of long-stroke pneumatic hydraulic cylinder body, its honing roughing is 4～6 times; Its honing fine finishing is 2～4 times.The grid processing method of inner cylinder body inner wall surface is identical with outer cylinder body.
The process equipment of long-stroke pneumatic hydraulic cylinder body, comprise numerically controlled lathe, plover mill machine and external cylindrical grinding machine, described plover mill machine comprises the unit head that is driven through driving mechanism by power mechanism, unit head connects honing lever, one side of honing lever is affixed decides hone stone, the opposite side middle part of honing lever is shaped on mounting groove, moving hone stone is installed in the mounting groove, one side of moving hone stone is shaped on sway brace, sway brace matches with the oblique groove of push rod, push rod connects unit head, it is characterized in that the described tilt fixing of deciding hone stone and honing lever is 30 °, and the gradient of the sway brace of moving hone stone is 15 °～17 °.The tilt fixing of deciding hone stone and honing lever is 30 °, and this angle helps guaranteeing processing circularity and concentricity etc.; The gradient of the sway brace of moving hone stone is 15 °～17 °, this gradient helps roof bar stay starting hone stone, after moving hone stone is put in place by support, make two to decide hone stone and moving hone stone all contacts with the inwall of outer cylinder body or inner cylinder body, at this moment just can honing.Its described sway brace is 2～5, and stressed even when making roof bar stay starting hone stone, jack-up is stable.Its described affixed separately diamond emery stick of outer wall of deciding hone stone and moving hone stone, the diamond emery stick contacts with the inwall of outer cylinder body or inner cylinder body, the diamond emery stick that honing roughing is adopted is 150#, the diamond emery stick that honing fine finishing is adopted is 300#, and the diamond emery stick is easier to honing than other material.
Description of drawings
Fig. 1 is the structural representation of long-stroke pneumatic oil hydraulic cylinder outer cylinder body of the present invention;
Fig. 2 is the structural representation of long-stroke pneumatic oil hydraulic cylinder inner cylinder body of the present invention;
Fig. 3 is the structural representation of existing long-stroke pneumatic hydrodynamic governor;
Fig. 4 is the structural representation that is used to process the honing unit head of long-stroke pneumatic hydraulic cylinder body of the present invention;
Fig. 5 is the A-A cross-sectional schematic of Fig. 4;
Fig. 6 is the honing lever structural representation that is used to process long-stroke pneumatic hydraulic cylinder body of the present invention;
Fig. 7 is that the B of Fig. 6 is to structural representation;
Fig. 8 is the moving hone stone structural representation that is used to process long-stroke pneumatic hydraulic cylinder body of the present invention.
Embodiment
The invention discloses a kind of long-stroke pneumatic hydrodynamic governor, as Fig. 1, shown in Figure 2, comprise outer cylinder body 1 and the inner cylinder body 2 made by round steel pipe, the middle part of outer cylinder body is shaped on oil through 17, oil through communicates with the hydraulic pressure cavity of cylinder block, the inner wall surface that it is characterized in that described outer cylinder body 1 and inner cylinder body 2 is shaped on grid 11 separately, 21, grid 11,21 is very small, naked eyes do not see, hand feel be still very smooth, grid 11, can hold lubricant oil in 21, make outer cylinder body 1 and inner cylinder body 2 keep lubricated for a long time, reduce piston greatly, the wearing and tearing of parts such as seal ring increase the service life, and reduce the heat that produces because of wearing and tearing.The length L of its described outer cylinder body 1 is 400 millimeters, endoporus aperture Φ is 15 millimeters, outer cylinder body 1 is 160～250 millimeters with effective travel after inner cylinder body 2 cooperates, the effective travel that is piston rod is 160～250 millimeters, that is to say and to realize that drilling depth reaches 160～250 millimeters, enlarge using scope, solved prior art and can not process technical barrier greater than deep hole more than 100 millimeters.
The processing method of long-stroke pneumatic hydraulic cylinder body is characterized in that the processing method of outer cylinder body 1 is:
A, to get specification be that endoporus aperture Φ is 15
-0.07 -0.10Millimeter, long 400 millimeters seamless precision steel pipe;
B, employing lathe cutting end flat, the heat treatment quenching and tempering typing, for the convenience of installing, also can be in two ends turning chamfering 15,16;
C, employing honing roughing, mill endoporus aperture Φ reaches 15
-0.02 -0.03Millimeter;
D, overlap endoporus, use the external cylindrical grinding machine cylindrical grinding, require concentricity with plug;
E, with numerically controlled lathe cutting oil through 17, the internal thread 12,13 (internal thread is used to install end cap, and the other end internal thread is used to install valve body) at cutting sealing groove 18, outer cylinder body two ends etc. simultaneously also;
F, carbonization treatment: make the degree of depth more than 0.05 millimeter;
G, employing honing fine finishing make degree of finish reach 0.05 micron, and perhaps about 0.05 micron, straightness accuracy reaches 400/0.01 millimeter, and circularity is controlled at 0.002 millimeter, and the steel pipe inner wall surface forms tiny grid.
Its honing roughing is 4～6 times, and its honing fine finishing is 2～4 times.
The process equipment of long-stroke pneumatic hydraulic cylinder body, comprise numerically controlled lathe, plover mill machine and external cylindrical grinding machine, described plover mill machine comprises the unit head that is driven through driving mechanism by power mechanism, as Fig. 4, shown in Figure 5, unit head connects honing lever 3, one side of honing lever is affixed decides hone stone 4,5, the opposite side middle part of honing lever is shaped on mounting groove 31, moving hone stone 6 is installed in the mounting groove 31, one side of moving hone stone 6 is shaped on sway brace 61, sway brace 61 matches with the oblique groove 71 of push rod 7, push rod 7 connects the unit head of plover mill machine, the structure of push rod is characterized in that the described hone stone 4 of deciding as shown in Figure 8,5 with the tilt fixing α of honing lever 3 be 30 °, this angle helps guaranteeing processing circularity and concentricity etc.; As shown in Figure 6, the gradient β of the sway brace 61 of moving hone stone is 15 °～17 °, this gradient helps roof bar stay starting hone stone 6, after moving hone stone 6 is put in place by support, make two to decide hone stone 4,5 and moving hone stone 6 all contacts with the inwall of outer cylinder body or inner cylinder body, at this moment just can honing.Its described sway brace 61 is 2～5, and sway brace shown in Figure 7 is 4, and sway brace is many more, and it is stressed even to make push rod 7 prop up when moving hone stone 6, and jack-up is stable.Its described outer wall of deciding hone stone 4,5 and moving hone stone 6 welds diamond emery stick 41,51,62 separately, diamond emery stick 41,51,62 contacts with the inwall of outer cylinder body 1 or inner cylinder body 2, the diamond emery stick 41,51,62 that honing roughing is adopted is 150#, the diamond emery stick 41,51,62 that honing fine finishing is adopted is 300#, and the diamond emery stick is easier to honing than other material.
Claims (8)
1, long-stroke pneumatic hydraulic cylinder body, comprise outer cylinder body (1) and the inner cylinder body (2) made by round steel pipe, the middle part of outer cylinder body is shaped on oil through (17), oil through communicates with the hydraulic pressure cavity of cylinder block, it is characterized in that the inner wall surface of described outer cylinder body (1) and inner cylinder body (2) is shaped on grid (11,21) separately.
2, long-stroke pneumatic hydraulic cylinder body as claimed in claim 1, the length (L) that it is characterized in that described outer cylinder body (1) is 400 millimeters, endoporus aperture (Ф) is 15 millimeters, and outer cylinder body (1) is 160～250 millimeters with effective travel (N) after inner cylinder body (2) cooperates.
3, long-stroke pneumatic hydraulic cylinder body as claimed in claim 1 is characterized in that the processing method of outer cylinder body (1) is:
A, to get specification be endoporus aperture (Ф) 15
-0.07 -0.10Millimeter, long 400 millimeters seamless precision steel pipe;
B, employing lathe cutting end flat, the heat treatment quenching and tempering typing;
C, employing honing roughing, mill endoporus aperture (Ф) reaches 15
-0.02 -0.03Millimeter;
D, overlap endoporus, use the external cylindrical grinding machine cylindrical grinding, require concentricity with plug;
E, cut oil through (17) with numerically controlled lathe;
F, carbonization treatment: make the degree of depth more than 0.05 millimeter;
G, employing honing fine finishing reach about 0.05 micron degree of finish, and straightness accuracy reaches 400/0.01 millimeter, and circularity is controlled at 0.002 millimeter, and the steel pipe inner wall surface forms tiny grid.
4, the processing method of pneumatic hydraulic cylinder body as claimed in claim 3 is characterized in that honing roughing is 4～6 times.
5, the processing method of pneumatic hydraulic cylinder body as claimed in claim 3 is characterized in that honing fine finishing is 2～4 times.
6, the process equipment of long-stroke pneumatic hydraulic cylinder body, comprise numerically controlled lathe, plover mill machine and external cylindrical grinding machine, described plover mill machine comprises the unit head that is driven through driving mechanism by power mechanism, unit head connects honing lever (3), one side of honing lever is affixed decides hone stone (4,5), the opposite side middle part of honing lever is shaped on mounting groove (31), moving hone stone (6) is installed in the mounting groove (31), one side of moving hone stone (6) is shaped on sway brace (61), sway brace (61) matches with the oblique groove (71) of push rod (7), push rod (7) connects unit head, it is characterized in that the described hone stone (4 of deciding, 5) tilt fixing (α) with honing lever (3) is 30 °, and the gradient (β) of the sway brace (61) of moving hone stone is 15 °～17 °.
7, the process equipment of long-stroke pneumatic hydraulic cylinder body as claimed in claim 6 is characterized in that described sway brace (61) is 2～5.
8, the process equipment of long-stroke pneumatic hydraulic cylinder body as claimed in claim 6, it is characterized in that the described affixed separately diamond emery stick of outer wall (41,51,62) of deciding hone stone (4,5) and moving hone stone (6), diamond emery stick (41,51,62) contacts with the inwall of outer cylinder body (1) or inner cylinder body (2), the diamond emery stick that honing roughing is adopted (41,51,62) is 150#, and the diamond emery stick that honing fine finishing is adopted (41,51,62) is 300#.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2008101205376A CN101344169B (en) | 2008-08-15 | 2008-08-15 | Long-stroke pneumatic hydraulic cylinder body processing method |
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| CN2008101205376A CN101344169B (en) | 2008-08-15 | 2008-08-15 | Long-stroke pneumatic hydraulic cylinder body processing method |
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| CN101344169A true CN101344169A (en) | 2009-01-14 |
| CN101344169B CN101344169B (en) | 2010-06-23 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133092A1 (en) * | 2009-05-21 | 2010-11-25 | 南阳开天工程机械有限公司 | Internal machining method for oil passage holes of hydraulic breaking hammer |
| CN102357728A (en) * | 2011-09-20 | 2012-02-22 | 温州日基电子机械有限公司 | Pneumatic point welding pliers |
| WO2012027942A1 (en) * | 2010-08-30 | 2012-03-08 | 兰州瑞德实业集团有限公司 | Compact and sensitive cylinder |
| CN103028893A (en) * | 2012-11-30 | 2013-04-10 | 苏州市意可机电有限公司 | Circular light tube processing technology |
| CN104690511A (en) * | 2015-02-13 | 2015-06-10 | 长治清华机械厂 | Slender and thin-walled step hole type inner-circle and outside-square structure finish machining method |
| CN106002093A (en) * | 2016-06-08 | 2016-10-12 | 郑州煤矿机械集团股份有限公司 | Manufacturing method for cylinder barrels with control valve bases |
| CN108098266A (en) * | 2017-12-15 | 2018-06-01 | 江苏三能动力总成有限公司 | A kind of cylinder body processing technology |
| CN108942094A (en) * | 2018-07-12 | 2018-12-07 | 西安飞豹科技有限公司 | A kind of oil cylinder elongated hole oil duct processing method reducing scrappage |
| CN110500416A (en) * | 2019-08-20 | 2019-11-26 | 科福龙阀门集团有限公司 | A kind of butterfly valve elastic metal sealing ring and its processing technology |
| CN111331320A (en) * | 2020-03-19 | 2020-06-26 | 无锡鹰贝精密轴承有限公司 | High-precision valve element and preparation method and application thereof |
| CN112475785A (en) * | 2020-10-21 | 2021-03-12 | 湖北冶鑫汽车零部件有限公司 | Valve sleeve machining process |
| CN113118706A (en) * | 2020-01-14 | 2021-07-16 | 宁波市祥运气动工具有限公司 | Machining method of air shovel cylinder body |
| CN113909807A (en) * | 2021-09-22 | 2022-01-11 | 王志君 | Production process of annular hydraulic cylinder for jacking bridge and building |
| CN114669966A (en) * | 2022-03-30 | 2022-06-28 | 武汉船用机械有限责任公司 | Machining method of oil cylinder body |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4254591A (en) * | 1979-06-28 | 1981-03-10 | Sedgwick Julius P | Internal lapping tool |
| CN200978849Y (en) * | 2006-09-11 | 2007-11-21 | 任海均 | Pneumatic and hydraulic speed stabilizer |
| CN201258886Y (en) * | 2008-08-15 | 2009-06-17 | 应云富 | Long stroke pneumatic hydraulic cylinder body and processing equipment thereof |
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2008
- 2008-08-15 CN CN2008101205376A patent/CN101344169B/en not_active Expired - Fee Related
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| WO2010133092A1 (en) * | 2009-05-21 | 2010-11-25 | 南阳开天工程机械有限公司 | Internal machining method for oil passage holes of hydraulic breaking hammer |
| WO2012027942A1 (en) * | 2010-08-30 | 2012-03-08 | 兰州瑞德实业集团有限公司 | Compact and sensitive cylinder |
| CN102357728A (en) * | 2011-09-20 | 2012-02-22 | 温州日基电子机械有限公司 | Pneumatic point welding pliers |
| CN103028893A (en) * | 2012-11-30 | 2013-04-10 | 苏州市意可机电有限公司 | Circular light tube processing technology |
| CN104690511A (en) * | 2015-02-13 | 2015-06-10 | 长治清华机械厂 | Slender and thin-walled step hole type inner-circle and outside-square structure finish machining method |
| CN106002093A (en) * | 2016-06-08 | 2016-10-12 | 郑州煤矿机械集团股份有限公司 | Manufacturing method for cylinder barrels with control valve bases |
| CN108098266A (en) * | 2017-12-15 | 2018-06-01 | 江苏三能动力总成有限公司 | A kind of cylinder body processing technology |
| CN108942094A (en) * | 2018-07-12 | 2018-12-07 | 西安飞豹科技有限公司 | A kind of oil cylinder elongated hole oil duct processing method reducing scrappage |
| CN110500416A (en) * | 2019-08-20 | 2019-11-26 | 科福龙阀门集团有限公司 | A kind of butterfly valve elastic metal sealing ring and its processing technology |
| CN113118706A (en) * | 2020-01-14 | 2021-07-16 | 宁波市祥运气动工具有限公司 | Machining method of air shovel cylinder body |
| CN111331320A (en) * | 2020-03-19 | 2020-06-26 | 无锡鹰贝精密轴承有限公司 | High-precision valve element and preparation method and application thereof |
| CN111331320B (en) * | 2020-03-19 | 2022-02-15 | 无锡鹰贝精密液压有限公司 | High-precision valve element and preparation method and application thereof |
| CN112475785A (en) * | 2020-10-21 | 2021-03-12 | 湖北冶鑫汽车零部件有限公司 | Valve sleeve machining process |
| CN113909807A (en) * | 2021-09-22 | 2022-01-11 | 王志君 | Production process of annular hydraulic cylinder for jacking bridge and building |
| CN114669966A (en) * | 2022-03-30 | 2022-06-28 | 武汉船用机械有限责任公司 | Machining method of oil cylinder body |
| CN114669966B (en) * | 2022-03-30 | 2023-08-18 | 武汉船用机械有限责任公司 | Processing method of oil cylinder body |
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