CN104014985A - High-temperature-resistant hydraulic cylinder manufacturing technology - Google Patents
High-temperature-resistant hydraulic cylinder manufacturing technology Download PDFInfo
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- CN104014985A CN104014985A CN201310065269.3A CN201310065269A CN104014985A CN 104014985 A CN104014985 A CN 104014985A CN 201310065269 A CN201310065269 A CN 201310065269A CN 104014985 A CN104014985 A CN 104014985A
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
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- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
A high-temperature-resistant hydraulic cylinder manufacturing technology comprises the following steps of (1) material selection, (2) product machining and (3) technology design. A material of a hydraulic cylinder is selected according to the pressure of a working medium and the size of a working cylinder. 40 forged steel or 45 forged steel or carbon steel STKM13C can be selected as the material of the hydraulic cylinder and a piston rod can be made of S45C carbon steel. Seamless cold drawing is conducted on the surface of the hydraulic cylinder, high-accuracy inclination intersecting boring is conducted on the inner diameter portion, the tolerance of the inner diameter ranges from H7 to H9, the surface roughness ranges from 0.8 S to 2.0 S, and the tension strength is over 5.2 MPa. Grinding and hard chroming are conducted on the outer diameter portion of the piston rod, the tolerance of the appearance ranges from f7 to f8, the surface hardness is over HV700, the surface roughness ranges from 0.8 S to 1.6 S, and the chroming thickness is 20 micrometers. According to the high-temperature hydraulic cylinder manufacturing technology, the hydraulic cylinder is good in high-temperature-resistant performance, the service life of a sealing device of the hydraulic cylinder can be prolonged, the number of needed spare parts is small, the number of replacement periods can be reduced, and therefore the labor intensity of workers is relieved; the structure is simple and the hydraulic cylinder is safe and reliable.
Description
Technical field
The invention belongs to mechanical-hydraulic equipment manufacturing technology field, be specifically related to a kind of high temperature resistance hydraulic cylinder manufacturing process for metallurgy industry, relate in particular to a kind of high temperature resistance hydraulic cylinder manufacturing process.
Background technology
Extensive use along with hydraulic technique, performance requirement to Hydraulic Elements is more and more higher, and for executive component-hydraulic cylinder, the principal element that affects its service life is buffering effect and sealing effectiveness, there is many defects in traditional design, can not meet the requirement of consecutive production.Zhejiang this hydropneumatic equipment Co., Ltd difficult to understand and Tianjin Uranus Hydraulic Machinery Co., Ltd. are for the defect existing in current domestic hydraulic cylinder structure design, a kind of novel oil cylinder Cushioning Design-ladder disign has been proposed, and the hermetically-sealed construction of oil cylinder has been done to improvement, thereby extended the service life of oil cylinder, but the life-span is only doubled, still can not meet user's demand; The pull rod type hydraulic cylinder that the Li Leshi of German Bosch (Rexroth) company produces all maintains the leading position in the world, what the materials standardization ground of piston rod adopted is steel chromed hardened, that harden, that have high resiliency value, this material guarantees to have performance and the optimum useful life of high resistance mechanical shock, installing space due to sealing between cylinder barrel, cylinder head and cylinder bottom is enclosed, there is the centering diameter of relative cylinder barrel the both sides of sealing, particularly, in the hydraulic cylinder of long stroke, have best sealing.Therefore, the hydraulic cylinder of Li Leshi is more stable in product quality, but because cost is high, so product is more expensive.
Along with the development of metallurgy industry, the application of hydraulic cylinder is more and more extensive, and operating mode is also more and more higher to the requirement of hydraulic cylinder.Under some special operation condition, environment temperature is very high, therefore extremely strict to the high temperature resistant requirement of hydraulic cylinder.For example, ladle slide gate in billet cylinder etc., owing to being subject to the closely heat radiation of Metal in Tundish and the mouth of a river, environment temperature is up to 400 ℃.Therefore, special operation condition condition has proposed baptism to the performance requirement of hydraulic cylinder.The general high temperature resistant operating characteristic that adds water jacket or realize product by the method for silicone rubber seal that adopts of traditional superhigh temperature hydraulic cylinder, but add water jacket method and be generally difficult for realizing quick-replaceable requirement in production application, while complex structure, sometimes be also difficult for realizing on-the-spot dimensional requirement, so practical application has certain limitation factor, (temperature of reason molten steel is more than 1300 ℃, if water is splashed in molten steel, water can be blasted in moment gasification expansion, has very large danger); Adopt silicone rubber seal, actual resistance to elevated temperatures, only 240 ℃ of left and right, can not meet actual needs completely.At present, the traditional superhigh temperature hydraulic cylinder of a lot of metallurgy industry most employing of steel plant's tundish quick-change mechanism, part adopts one traditional of superhigh temperature hydraulic cylinder increase to stop heat radiation steel plate or be directly wound around heatproof zone in high-temperature liquid cylinder pressure appearance, but this can not meet actual needs completely, and because resistance to elevated temperatures is poor, need standby redundancy quantity many, often change impact and produce.
Summary of the invention
The object of the invention is to design a kind of high temperature resistance hydraulic cylinder manufacturing process, address the above problem.
To achieve these goals, the technical solution used in the present invention is as follows:
A high temperature resistance hydraulic cylinder manufacturing process, is characterized in that, comprises the following steps:
The 1st step, material is selected;
The 2nd step, product processing;
The 3rd step, technological design.
Material described in the 1st step is selected, and the material of hydraulic cylinder is selected according to the pressure size of working media and the size of working cylinder.
The material of described hydraulic cylinder, range of choice is 40 forged steel, 45 forged steel or carbon steel STKM13C, piston rod material is S45C carbon steel.
Described hydraulic cylinder surface is seamless cold-draw processing, and internal diameter is high accuracy gradient intersection Boring, and id tolerance is H7～H9, and surface roughness is 0.8～2.0S, and it is more than 5.2MPa drawing Zhang Qiangdu; Described piston rod external diameter is for grinding and hard chromium plating processing, and appearance tolerance is f7～f8, and case hardness is more than HV700, and surface roughness is 0.8～1.6S, and hard chrome thickness is 20 microns.
The processing of product described in the 2nd step, working fluid cylinder pressure cylinder barrel technique is cold-drawing technology, and the cylinder barrel after described cold-drawing technology processing is reserved with the fine finishining amount of 0.2～0.5mm and carries out honing processing, and meanwhile, the treatment process adopting afterwards in welding is special thermal treatment technique; The spare and accessory parts of every spare and accessory parts for completing through CNC lathe, CNC milling machine Precision Machining, described spare and accessory parts dimensional tolerance meets JIS standard.
Technological design described in the 3rd step, in hydraulic cylinder surface design, there is heat shield and be wound with heatproof zone in described collet appearance, between described hydraulic cylinder and described heat shield, be formed with air chamber layer, and adopt compressed air to take away heat discharge in air chamber intrastratal flow, discharge directions and piston rod stretch out direction in the same way, Exhaust Gas carries out cooling to piston rod, liquid cylinder entity is obtained fully cooling.
Technological design described in the 3rd step, a side of described heat shield is provided with reflecting curtain that can reflective thermal radiation.
Technological design described in the 3rd step, has I-shaped cutting somebody's hair in piston element Front-end Design, and described I-shaped cutting somebody's hair is connected with the slide block mechanism of middle steel ladle.
Technological design described in the 3rd step, has quick change hook in the Front-end Design of part of cylinder block, and described quick change hook is connected with the slot in middle steel ladle.
A high temperature resistance hydraulic cylinder manufacturing process, comprises cylinder barrel, cylinder cap, piston element, rear end cap, sealing device, fairlead, heat shield, reflecting curtain, cuts somebody's hair and quick change hook; Described piston element is positioned at described cylinder barrel, and described rear end cap is the rear end cap with fuel feed hole; Described cylinder barrel and described cylinder cap form the part of cylinder block becoming one, and described fairlead is installed between piston body front end and described part of cylinder block; Between described fairlead and the inner surface of described part of cylinder block, be provided with annular air chamber, the front end of described fairlead is provided with air discharge duct, and described air discharge duct is communicated with described annular air chamber; Described heat shield is socketed on outside described part of cylinder block, on described heat shield, be provided with compressed air inlet port, the outer surface of described heat shield and described part of cylinder block is provided with annular compression air chamber, described part of cylinder block is provided with passage, and described passage runs through described annular compression air chamber and described annular air chamber.The outer surface of described heat shield is wound with heatproof zone.One side of described heat shield is provided with reflecting curtain, described reflecting curtain be can reflective thermal radiation reflecting curtain.Described cutting somebody's hair is installed on described piston element front end, described in cut somebody's hair and be connected with the slide block machine of middle steel ladle.Described cutting somebody's hair cut somebody's hair for I-shaped.Described quick change hook is installed on described part of cylinder block front end, and described quick change hook is connected with the slot in middle steel ladle.
The invention provides a kind of hydraulic cylinder manufacturing technology, structural design, production method and the technological process of traditional metallurgical hydraulic cylinder have been changed, thereby manufacture out a kind of high temperature resistance hydraulic cylinder, with overcome the above-mentioned resistance to elevated temperatures that prior art exists poor, need standby redundancy quantity many, often change the weak points that impact is produced, improved liquid cylinder pressure service life, made product hydraulic cylinder under the high temperature of 400 ℃, use and can reach 6 to 7 months.
Beneficial effect of the present invention can be summarized as follows:
1, metal material utilization rate is high:
Traditional approach working fluid cylinder pressure cylinder barrel generally adopts " boring-roller " Cutting Process, affected by raw material self linearity and tube wall inhomogeneities, need, according to the reserved different allowance of actual conditions, cause metal material waste large, the utilization rate of its material only has 70%～80%, even lower.And employing cold-drawing technology working fluid cylinder pressure cylinder barrel, metal pipe material is that the method for reduced outside diameter, expansion internal diameter under cold extrusion state reaches desired dimensional accuracy, without metal cutting phenomenon, occur, for further reducing roughness, the raising dimensional accuracy of inner wall of cylinder, cylinder barrel after cold-drawn only need be reserved the fine finishining amount of 0.2～0.5mm and carry out honing, the stock utilization of therefore, cold-drawn technology working fluid cylinder pressure cylinder barrel is more than 95%.
2, resistance to elevated temperatures is good:
Because the present invention is integrated by cylinder barrel and cylinder cap, between fairlead and part of cylinder block inner surface, be provided with an annular air chamber, the front end of fairlead is provided with the air discharge duct being communicated with annular air chamber; On heat shield, be provided with compressed air inlet port, and be provided with annular compression air chamber between heat shield and part of cylinder block outer surface, on part of cylinder block, also have the passage that connects annular compression air chamber and annular air chamber.This structural design can make the compressed air inlet port of compressed air from heat shield enter the annular compression air chamber between heat shield and part of cylinder block, this air stream annular air chamber between fairlead and part of cylinder block of flowing through, gas in two air chambers can be taken away most of heat on hydraulic cylinder surface, thereby formation thermal air current, discharges the air discharge duct of the last front end from fairlead.Therefore, the present invention can realize and adopt mobile compressed air as the air cooling way of cooling source, the temperature of hydraulic cylinder outer surface to be taken away, thereby can make hydraulic cylinder internal temperature drop in the normal temperature range of using of seal of sealing device, its resistance to elevated temperatures is very good.
3, long service life:
The hydraulic cylinder of traditional structure is in Metal in Tundish and closely heat radiation of the mouth of a river, environment temperature is up under the operating mode of 400 ℃, be one month service life, longer one and a half months left and right, its service life is shorter, and the present invention is because its resistance to elevated temperatures is better, can reach six, seven months service life, greatly extended its service life.
4, reduce the replacement cycle, alleviate workman's labour intensity:
Because resistance to elevated temperatures of the present invention is better, can extend the service life of its sealing device, therefore need standby redundancy quantity few, also can reduce the replacement cycle, thereby alleviate workman's labour intensity.
5, simple in structure, can meet on-the-spot actual demand:
Of the present invention relatively simple for structure, and safe and reliable, in addition, the present invention is also provided with and cuts somebody's hair, quick change is linked up with and reflecting curtain, the effect of wherein cutting somebody's hair is to be connected with the slide block mechanism of middle steel ladle, and its hydraulic thrust is the more than 2 times of existing metallurgical hydraulic cylinder, can reach 22 tons; The effect of quick change hook is by comprising being connected of groove with middle molten steel, so that when hydraulic cylinder breaks down, can carry out quick-replaceable hydraulic cylinder; Reflecting curtain is for reflective thermal radiation, and therefore, the present invention can meet on-the-spot actual demand completely.
Accompanying drawing explanation
Fig. 1 is traditional metallurgical hydraulic cylinder structure figure;
Fig. 2 is structure chart of the present invention.
In figure: 1-cuts somebody's hair; 2-quick change hook; 3-warm air exhaust port; 4-part of cylinder block; 5-guide housing; 6-heat shield; 7-piston rod; 8-air chamber layer; 9-compressed air inlet; 10-piston; 11-reflecting curtain.
The specific embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
A kind of high temperature resistance hydraulic cylinder manufacturing process as shown in Figure 2, comprises the following steps:
The 1st step, material is selected;
The 2nd step, product processing;
The 3rd step, technological design.
Material described in the 1st step is selected, and the material of hydraulic cylinder is selected according to the pressure size of working media and the size of working cylinder.The material of described hydraulic cylinder, range of choice is 40 forged steel, 45 forged steel or carbon steel STKM13C, piston rod 7 materials are S45C carbon steel.Described hydraulic cylinder surface is seamless cold-draw processing, and internal diameter is high accuracy gradient intersection Boring, and id tolerance is H7～H9, and surface roughness is 0.8～2.0S, and it is more than 5.2MPa drawing Zhang Qiangdu; Described piston rod 7 external diameters are for grinding and hard chromium plating processing, and appearance tolerance is f7～f8, and case hardness is more than HV700, and surface roughness is 0.8～1.6S, and hard chrome thickness is 20 microns.
The processing of product described in the 2nd step, working fluid cylinder pressure cylinder barrel technique is cold-drawing technology, cylinder barrel after described cold-drawing technology V processing is reserved with the fine finishining amount of 0.2～0.5mm and carries out honing processing, and meanwhile, the treatment process adopting afterwards in welding is special thermal treatment technique; The spare and accessory parts of every spare and accessory parts for completing through CNC lathe, CNC milling machine Precision Machining, described spare and accessory parts dimensional tolerance meets JIS standard.
Technological design described in the 3rd step, in hydraulic cylinder surface design, there is heat shield 6 and be wound with heatproof zone in described heat shield 6 appearances, between described hydraulic cylinder and described heat shield 6, be formed with air chamber layer 8, and adopt compressed air to walk heat discharge at the interior fluxion strap of air chamber layer 8, discharge directions and piston rod 7 stretch out direction in the same way, Exhaust Gas carries out cooling to piston rod 7, liquid cylinder entity is obtained fully cooling.One side of described heat shield is provided with reflecting curtain 11 that can reflective thermal radiation.In piston element Front-end Design, have and I-shapedly cut somebody's hair 1, described I-shaped cutting somebody's hair 1 is connected with the slide block mechanism of middle steel ladle.Front-end Design at part of cylinder block 4 has quick change hook 2, and described quick change hook 2 is connected with the slot in middle steel ladle.
The present invention's " a kind of high temperature resistance hydraulic cylinder manufacturing process ", the related a kind of hydraulic cylinder of this technology, comprise cylinder barrel, cylinder cap, be positioned at piston element, the rear end cap with fuel feed hole, the sealing device of cylinder barrel, this hydraulic cylinder also includes fairlead 5, heat shield 6, reflecting curtain 11, cut somebody's hair 1, quick change hook 2; Described cylinder barrel and cylinder cap are integrated is part of cylinder block 4, fairlead 5 is arranged between piston 10 body front ends and part of cylinder block 4, and between fairlead 5 and part of cylinder block 4 inner surfaces, establish a strange annular air chamber, the front end of fairlead 5 is provided with the air discharge duct being communicated with annular air chamber; Described heat shield 6 is socketed in outside part of cylinder block 4, and on heat shield 6, be provided with compressed air inlet port 9, between heat shield 6 and part of cylinder block 4 outer surfaces, be provided with annular compression air chamber, on part of cylinder block 4, also have the passage that connects annular compression air chamber and annular air chamber.Its technical characterictic is:
(1) material is selected:
The material of hydraulic cylinder can be selected according to the pressure size of working media and the size of working cylinder, range of choice should adopt conventional 40,45 forged steel, or mechanical realization carbon steel STKM13C, through seamless surface cold-draw, internal diameter intersects after Boring through high accuracy gradient again, id tolerance is at H7～H9, and surface roughness is at 0.8～2.0S, draws more than Zhang Qiangdu reaches 5.2MPa; Piston rod 7 materials are S45C carbon steels that mechanical realization is used, external diameter through grinding and hard chromium plating after, appearance tolerance is at f7～f8, more than case hardness HV700, surface roughness is at 0.8～1.6S, 20 microns of hard chrome thickness; Oil sealing is used the senior highly finished product of import, oil resistant, anti-corrosion, abrasion performance and compression resistance.
(2) product processing: adopt cold-drawing technology working fluid cylinder pressure cylinder barrel, reduce extension plastic deformation dimensional accuracy high, without metal cutting phenomenon, occur, cylinder barrel after cold-drawn only need be reserved the fine finishining amount of 0.2～0.5mm and carry out honing, improved stock utilization, meanwhile, after welding, adopt special thermal treatment technique, guaranteed every combination property of product; Every spare and accessory parts, all complete through CNC lathe, CNC milling machine Precision Machining, and dimensional tolerance meets JIS standard, and interchangeability is good, and the life-span is long, maintenance is easy.
(3) technological design:
1. to utilize air be not the characteristic of hot good conductor to project, on hydraulic cylinder surface, increase heat shield 6 and be wound around heatproof zone in collet appearance, make to form air chamber layer 8 between hydraulic cylinder and heat shield 6, and adopt compressed air to walk heat discharge at the interior fluxion strap of air chamber layer 8, discharge directions and piston rod 7 stretch out direction in the same way, Exhaust Gas carries out cooling to piston rod 7, liquid cylinder entity is obtained fully cooling, protection seal not thermal radiation directly affects, improve hydraulic cylinder service life, under the high temperature of 400 ℃, use and can reach 6 to 7 months;
2. a side of hydraulic cylinder heat shield 6 install can reflective thermal radiation reflecting curtain 11, for reflective thermal radiation, except playing effective heat-blocking action, global advantage is all better than existing metallurgical hydraulic cylinder, and be the more than 6 times of existing metallurgical hydraulic cylinder its service life;
3. at piston element front end, be provided with and I-shapedly cut somebody's hair 1, this is cut somebody's hair and 1 is connected with the slide block mechanism of middle steel ladle, and except playing and outside being connected effect, hydraulic thrust is the more than 2 times of existing metallurgical hydraulic cylinder, can reach 22 tons;
4. the front end at part of cylinder block 4 is provided with quick change hook 2, and this quick change hook 2 is connected with the slot in middle steel ladle, so that when hydraulic cylinder breaks down, can carry out quick-replaceable hydraulic cylinder.
More than by the detailed description of concrete and preferred embodiment the present invention; but those skilled in the art should be understood that; the present invention is not limited to the above embodiment; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement etc., within protection scope of the present invention all should be included in.
Claims (9)
1. a high temperature resistance hydraulic cylinder manufacturing process, is characterized in that, comprises the following steps:
The 1st step, material is selected;
The 2nd step, product processing;
The 3rd step, technological design.
2. high temperature resistance hydraulic cylinder manufacturing process according to claim 1, is characterized in that, material described in the 1st step is selected, and the material of hydraulic cylinder is selected according to the pressure size of working media and the size of working cylinder.
3. high temperature resistance hydraulic cylinder manufacturing process according to claim 2, is characterized in that, the material of described hydraulic cylinder, and range of choice is 40 forged steel, 45 forged steel or carbon steel STKM13C, piston rod material is S45C carbon steel.
4. high temperature resistance hydraulic cylinder manufacturing process according to claim 3, is characterized in that, described hydraulic cylinder surface is seamless cold-draw processing, internal diameter is high accuracy gradient intersection Boring, id tolerance is H7～H9, and surface roughness is 0.8～2.0S, and it is more than 5.2MPa drawing Zhang Qiangdu; Described piston rod external diameter is for grinding and hard chromium plating processing, and appearance tolerance is f7～f8, and case hardness is more than HV700, and surface roughness is 0.8～1.6S, and hard chrome thickness is 20 microns.
5. high temperature resistance hydraulic cylinder manufacturing process according to claim 1, it is characterized in that, the processing of product described in the 2nd step, working fluid cylinder pressure cylinder barrel technique is cold-drawing technology, cylinder barrel after described cold-drawing technology processing is reserved with the fine finishining amount of 0.2～0.5mm and carries out honing processing, meanwhile, the treatment process adopting afterwards in welding is special thermal treatment technique; The spare and accessory parts of every spare and accessory parts for completing through CNC lathe, CNC milling machine Precision Machining, described spare and accessory parts dimensional tolerance meets JIS standard.
6. high temperature resistance hydraulic cylinder manufacturing process according to claim 1, is characterized in that, technological design described in the 3rd step,
In hydraulic cylinder surface design, there is heat shield and be wound with heatproof zone in described collet appearance, between described hydraulic cylinder and described heat shield, be formed with air chamber layer, and adopt compressed air to take away heat discharge in air chamber intrastratal flow, discharge directions and piston rod stretch out direction in the same way, Exhaust Gas carries out cooling to piston rod, liquid cylinder entity is obtained fully cooling.
7. high temperature resistance hydraulic cylinder manufacturing process according to claim 6, is characterized in that, technological design described in the 3rd step, and a side of described heat shield is provided with reflecting curtain that can reflective thermal radiation.
8. high temperature resistance hydraulic cylinder manufacturing process according to claim 1, is characterized in that, technological design described in the 3rd step, has I-shaped cutting somebody's hair in piston element Front-end Design, and described I-shaped cutting somebody's hair is connected with the slide block mechanism of middle steel ladle.
9. high temperature resistance hydraulic cylinder manufacturing process according to claim 1, is characterized in that, technological design described in the 3rd step has quick change hook in the Front-end Design of part of cylinder block, and described quick change hook is connected with the slot in middle steel ladle.
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| CN201310065269.3A CN104014985A (en) | 2013-02-28 | 2013-02-28 | High-temperature-resistant hydraulic cylinder manufacturing technology |
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| CN201310065269.3A CN104014985A (en) | 2013-02-28 | 2013-02-28 | High-temperature-resistant hydraulic cylinder manufacturing technology |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454760A (en) * | 2014-11-28 | 2015-03-25 | 柳州威力士液压设备有限公司 | Hydraulic cylinder |
| CN104500489A (en) * | 2014-11-28 | 2015-04-08 | 柳州威力士液压设备有限公司 | Hydraulic cylinder |
| CN105081711A (en) * | 2015-09-02 | 2015-11-25 | 上海思客琦自动化工程有限公司 | Welding method for oil cylinder piston rod obtained after chromium plating |
| CN105691448A (en) * | 2014-11-26 | 2016-06-22 | 四平市方向机械有限公司 | Truck steering hydraulic force assisting oil cylinder and production process thereof |
| CN109372822A (en) * | 2018-11-09 | 2019-02-22 | 佛山市科立天源冶金技术有限公司 | A kind of casting oil cylinder |
| CN113714733A (en) * | 2021-05-28 | 2021-11-30 | 中铁七局集团电务工程有限公司 | Production process of high-sealing pneumatic tension compensation device |
-
2013
- 2013-02-28 CN CN201310065269.3A patent/CN104014985A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105691448A (en) * | 2014-11-26 | 2016-06-22 | 四平市方向机械有限公司 | Truck steering hydraulic force assisting oil cylinder and production process thereof |
| CN104454760A (en) * | 2014-11-28 | 2015-03-25 | 柳州威力士液压设备有限公司 | Hydraulic cylinder |
| CN104500489A (en) * | 2014-11-28 | 2015-04-08 | 柳州威力士液压设备有限公司 | Hydraulic cylinder |
| CN105081711A (en) * | 2015-09-02 | 2015-11-25 | 上海思客琦自动化工程有限公司 | Welding method for oil cylinder piston rod obtained after chromium plating |
| CN109372822A (en) * | 2018-11-09 | 2019-02-22 | 佛山市科立天源冶金技术有限公司 | A kind of casting oil cylinder |
| CN109372822B (en) * | 2018-11-09 | 2024-04-16 | 广东科立工业技术股份有限公司 | Casting oil cylinder |
| CN113714733A (en) * | 2021-05-28 | 2021-11-30 | 中铁七局集团电务工程有限公司 | Production process of high-sealing pneumatic tension compensation device |
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Application publication date: 20140903 |