CN102094857B - High-temperature flexible boosting cylinder - Google Patents
High-temperature flexible boosting cylinder Download PDFInfo
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- CN102094857B CN102094857B CN 201110006852 CN201110006852A CN102094857B CN 102094857 B CN102094857 B CN 102094857B CN 201110006852 CN201110006852 CN 201110006852 CN 201110006852 A CN201110006852 A CN 201110006852A CN 102094857 B CN102094857 B CN 102094857B
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Abstract
The invention relates to a boosting device for forming a titanium alloy constant high-temperature forming material, in particular to a boosting cylinder which can tolerate the high temperature of between 750 and 850 DEG C and can use high-temperature flexible forming media. The boosting cylinder solves the technical bottleneck that the cylinder body and hydraulic oil of the common boosting cylinder cannot tolerate high temperature for forming materials such as a titanium alloy and the like at present. Low melting point alloys, heat-resistant ceramic particles and the like are taken as the high-temperature flexible forming media; components such as a cylinder body, a piston and the like at a high-pressure end of the boosting cylinder are made of high-temperature alloys and can tolerate the high temperature of between 750 and 850 DEG C; a cooling water cavity is formed to prevent high temperature at the high-pressure end from being transferred to a low-pressure end and prevent the hydraulic oil at the low-pressure end from being failed due to overhigh temperature; a cylinder body, a piston and a connecting rod at the low-pressure end are made of the common steel, and the common heat-resistant hydraulic oil is used in a low-pressure cavity to control the feeding and returning actions of the boosting cylinder; and the boosting cylinder is convenient to assemble and disassemble due to a modular design, and different boost ratios can be obtained by replacing a sleeve and the piston at the high-pressure end.
Description
Technical field
The present invention relates to a kind of supercharging device that can be used for hot forming material formings such as titanium alloy, be a kind of 750 ℃ to 850 ℃ left and right sides high temperature that can tolerate specifically, and can use the pressurized cylinder of high temperature flexible forming medium.
Background technique
Along with the impact of the serious day by day and energy crisis of the development of materials science, environmental issue, the needs of lightweight, high tenacity, resistant to elevated temperatures new structural material are more and more urgent.Brand-new materials such as titanium alloy are low because of density, specific strength is high, anti-corrosion advantage such as weld is used widely it.No longer be confined to military domain such as Aeronautics and Astronautics, weapons; And entered into civilian industry field with huge market potential; In recent years; These materials have also obtained extensive use in fields such as oil, chemical industry, automobile, biomedicine and stationery sports goodss, and become new process, new technology, the indispensable metallic material of new equipment.
Titanium alloy etc materials thin-wall part plastic deformation scope is narrow; It is poor that serious, the difficulty that is shaped of easy to crack, resilience, big resilience cause part to paste mould property, shows comparatively significantly change of shape after the unloading usually; Affect the geometric accuracy of product, severe patient can cause the overproof inefficacy of part.In addition, because the residual stress that mutual restraining function produced of resilience can also cause the part after the shaping is depositing or cracking appears in duration of work.So these materials have become the material of difficult machining at room temperature of generally acknowledging; Thereby under thermal environment, form processing usually; It is a kind of new plate flexible die forming technology that warm flexible media is shaped, and adopts certain high temperature power transmission medium, like resisting medium such as super heated rubber, polyurethane or liquid plasma water and high temperature high pressure oil or solid-state special powder etc. as soft protruding (recessed) mould; Use rigidity recessed (protruding) mould again, under the effect of power transmission medium, make sheet material forming.Be particularly suitable for sheet material formings such as the many kinds in fields such as Aero-Space, automobile, complicated shape titanium alloy, magnesium alloy, composite material.Especially sheet material such as high-temperature titanium alloy is because its forming temperature is high for titanium alloy plate, so warm flexible media shaping difficulty is big, domestic still nobody relates to.
Hydraulic pressure booster cylinder is the significant components in the flexible hydraulic formation technique system, and it will be converted into high pressure and output through the ratio of the piston area in the cylinder by the low pressure that oil hydraulic pump passes over, and its principle formula is: P
1/ P
2=S
2/ S
1, promptly low voltage terminal and the pressure of high voltage terminal are than the area inverse ratio that equals low voltage terminal and high voltage terminal.
At present, pressurized cylinder commonly used uses plain carbon steel as manufactured materials, and structure comprises several parts of low voltage terminal, high voltage terminal, piston and cylinder body.During use, oil hydraulic pump charges into hydraulic oil to low voltage terminal, through the area specific output high pressure of low voltage terminal and high voltage terminal piston, makes hydraulic oil acquisition high pressure in the hyperbaric chamber, and then realizes function of increasing pressure.But so common pressurized cylinder only is applicable to normal temperature or is no more than the working condition of hydraulic oil heat-resistant limit (most applications＜400 ℃).But when utilizing high temperature flexible media formation technique to make product such as titanium alloy; Because forming temperature is many about 750 ℃; The cylinder block material and the hydraulic oil of general pressurized cylinder can't tolerate high temperature like this and then inefficacy, so become the technical bottleneck that realizes high temperature flexible media formation technique.
Therefore design a kind of flexible supercharging device that can satisfy high temperature flexible media formation technique; Can tolerate 750 ℃ to 850 ℃ left and right sides elevated operating temperatures; And has a special construction design; Make it can adopt the flexible media that can tolerate high temperature, become the technical barrier that those skilled in the art press for solution as working medium.
Summary of the invention
The objective of the invention is in order to overcome the defective that existing pressurized cylinder is not suitable for high temperature flexible media formation technique; A kind of pressurized cylinder is provided; This pressurized cylinder cylinder body and piston can not only bear 750 ℃ to 850 ℃ left and right sides high temperature, through the design of special cooling component, under the condition of using common high temperature hydraulic oil, get final product proper functioning; And through cylinder body being carried out the special construction design, the flexible forming medium that use can tolerate ultra-high temperature becomes possibility.
A kind of high temperature of the present invention is used flexible pressurized cylinder, comprises connecting rod, low voltage terminal cylinder body, low voltage terminal piston, mazy type cooling water chamber, high voltage terminal cylinder body, high voltage terminal piston and high voltage terminal sleeve; Low voltage terminal cylinder body, mazy type cooling water chamber, high voltage terminal cylinder body, high voltage terminal sleeve fixed order successively connect, and the low voltage terminal cylinder base is provided with first hydraulic fluid port, and peripheral sidewall is provided with second hydraulic fluid port; The mazy type cooling water chamber is respectively equipped with water intake and water outlet; Connecting rod one end passes low voltage terminal cylinder base center and connects position limit switch; The other end connects the low voltage terminal piston; Low voltage terminal piston another side connects the high voltage terminal piston, and the low voltage terminal piston is positioned at the cavity of low voltage terminal cylinder interior, and the high voltage terminal piston is arranged in the cavity of mazy type cooling water chamber, high voltage terminal cylinder body and high voltage terminal sleeve inner; The low voltage terminal piston outer wall cooperates with low voltage terminal inboard wall of cylinder block size, and the sidewall of high voltage terminal piston cooperates with high voltage terminal cylinder body, high voltage terminal sleeve lining size; The low voltage terminal cylinder body is divided into two cavitys by the low voltage terminal piston, forms low pressure chamber, and high voltage terminal cylinder body, high voltage terminal sleeve and high voltage terminal piston surround the cavity that forms, and forms hyperbaric chamber.
The invention has the advantages that:
(1) pressurized cylinder can work long hours at 750 ℃ to 850 ℃ left and right sides high temperature;
(2) can use common high temperature hydraulic oil control pressurized cylinder to move in the low pressure chamber and in the hydraulic control circuit of composition such as the oil hydraulic pump that links to each other with low pressure chamber, oil pipe, fuel tank, and needn't worry the too high and then inefficacy of hydraulic fluid temperature;
(3) owing to use low-melting alloy or heat-stable ceramic particle as high temperature flexible forming medium; The present invention uses a high voltage terminal sleeve; Directly the pressurized machine high voltage terminal is connected with the forming die counterdie; Be convenient to take out after interpolation and the low-melting alloy cooled and solidified of flexible media, and guarantee the sealing of barrel and high voltage terminal piston;
(4) modular design makes things convenient for each assembly disassembling, assembling and replacing and obtains different pressure ratios.
Description of drawings
Fig. 1 is the structural representation of a kind of high temperature of the present invention with flexible pressurized cylinder.
Among Fig. 1: 1. connecting rod, 2. seal ring, 3. first hydraulic fluid port, 4. seal ring, 5. low voltage terminal cylinder body, 6. seal ring, 7. water intake; 8. mazy type cooling water chamber, 9. bolt, 10. nut, 11. high voltage terminal cylinder bodies, 12. high-temperature seal rings, 13. high voltage terminal sleeves; 14. screw, 15. hyperbaric chambers, 16. high voltage terminal pistons, 17. high-temperature seal rings, 18. high-temperature seal rings, 19. high-temperature seal rings; 20. water outlet, 21. nuts, 22. bolts, 23. second hydraulic fluid ports, 24. low voltage terminal pistons, 25. low pressure chamber.
Embodiment
To combine accompanying drawing that the present invention is done further detailed description below.
The present invention is that a kind of high temperature is used flexible pressurized cylinder, and is as shown in Figure 1, comprises connecting rod 1, low voltage terminal cylinder body 5, low voltage terminal piston 24, mazy type cooling water chamber 8, high voltage terminal cylinder body 11, high voltage terminal piston 16 and high voltage terminal sleeve 13.
Low voltage terminal cylinder body 5 is connected through bolt 22, nut 21 with mazy type cooling water chamber 8, and the junction uses seal ring 6 to seal; Mazy type cooling water chamber 8 is connected through bolt 9, nut 10 with high voltage terminal cylinder body 11, and the junction uses high-temperature seal ring 19 to seal; High voltage terminal cylinder body 11 is connected through screw 14 with high voltage terminal sleeve 13, and the junction uses high-temperature seal ring 12 to seal; Low voltage terminal cylinder body 5, mazy type cooling water chamber 8, high voltage terminal cylinder body 11, high voltage terminal sleeve 13 inner chambers are all cylindric.
Low voltage terminal cylinder body 5 bottoms are provided with first hydraulic fluid port 3, and peripheral sidewall is provided with second hydraulic fluid port 23; Mazy type cooling water chamber 8 is respectively equipped with water intake 7 and water outlet 20.
Connecting rod 1 is a cylindrical body, and there is screw thread an end end, is used to connect low voltage terminal piston 24, and the other end passes low voltage terminal cylinder body 5 bottom centre, is used to install position limit switch; Low voltage terminal piston 24 is discoid, and one side has boss and helical thread portion, is used to connect high voltage terminal piston 16, and another side auger shell pit is used to connect connecting rod 1; High voltage terminal piston 16 is the ladder cylindrical body, and the small end end face is beaten groove and is drilled with tapped hole, is used to connect low voltage terminal piston 24; Wherein use between low voltage terminal piston 24 and the high voltage terminal piston 16 to be threaded, and cooperate with high voltage terminal piston 16 terminal grooves, guaranteed the two-piston dead in line by low voltage terminal piston 24 convex platforms.Low voltage terminal piston 24 outer walls cooperate with low voltage terminal cylinder body 5 inwall sizes, and the sidewall of high voltage terminal piston 16 cooperates with high voltage terminal cylinder body 11, high voltage terminal sleeve 13 inwall sizes.
Connecting rod 1 adopts seal ring 2 to seal with low voltage terminal cylinder body 5 contacting part offices.Low voltage terminal piston 24 is positioned at the cavity of low voltage terminal cylinder body 5 inside, and low voltage terminal piston 24 adopts seal ring 4 to seal with low voltage terminal cylinder body 5 contact segments.High voltage terminal piston 16 is arranged in the cavity of mazy type cooling water chamber 8, high voltage terminal cylinder body 11 and high voltage terminal sleeve 13 inside; The part that high voltage terminal piston 16 contacts with high voltage terminal cylinder body 11 adopts high-temperature seal ring 18 to seal, and the part that contacts with high voltage terminal sleeve 13 adopts high-temperature seal ring 17 to seal.
Low voltage terminal cylinder body 5 is divided into two cavitys by low voltage terminal piston 24, forms low pressure chamber 25, and high voltage terminal cylinder body 11, high voltage terminal sleeve 13 and high voltage terminal piston 16 surround the cavity that forms, and form hyperbaric chamber 15.
High voltage terminal cylinder body 11, high voltage terminal sleeve 13 and high voltage terminal piston 16 adopt high-temperature alloy material to process; Can tolerate 750 ℃ to 850 ℃ left and right sides high temperature; High voltage terminal sleeve 13 inwalls and high voltage terminal piston 16 termination sprayed coating insulating moulding coatings; High voltage terminal piston 16 terminations can install the heat-stable ceramic liner additional, reduce high voltage terminal piston 16 and transmit heat to low voltage terminal.
Low voltage terminal cylinder body 5, low voltage terminal piston 24 and connecting rod 1 adopt the plain carbon steel material to process, and use common heat-resisting hydraulic oil in the low pressure chamber 25, control the feeding supercharging of pressurized cylinder and return the pressure release action.
The connecting rod 1 that low voltage terminal piston 24 tail ends connect is used to install position limit switch, as protection mechanism, limits the minimum and maximum stroke of pressurized cylinder.
Pressurized cylinder adopts modular design, and easy disassembly only need be changed the high voltage terminal sleeve 13 and the high voltage terminal piston 16 of different-diameter, can satisfy the demand that obtains different pressure ratios.
Said seal ring 2, seal ring 4, seal ring 6 are the conventional hydraulic oil seal ring of using; High-temperature seal ring 12, high-temperature seal ring 18, high-temperature seal ring 19 are for to be used to seal heat resistant oils and can to tolerate 750 ℃ of high-temperature seal rings to 850 ℃ of left and right sides temperature; High-temperature seal ring 17 seals the high temperature of high temperature flexible media and can tolerate the high-temperature seal ring about 750 ℃ to 850 ℃ for being used to.
During work, pressurized cylinder needs vertically to install, and the pressurized cylinder upper end directly is connected with bolt with the forming die counterdie through high voltage terminal sleeve 13.Whole pressurized cylinder is divided into four zones by each assembly; Comprise: 1) two chambeies being divided into by low voltage terminal piston 24 of low voltage terminal cylinder body 5; Two chambeies with and the hydraulic control circuit formed through first hydraulic fluid port 3 and second hydraulic fluid port 23 and hydraulic control valve piece, oil hydraulic pump, oil pipe, fuel tank etc. in all use common high temperature hydraulic oil, control pressurized cylinder low voltage terminal piston 24 feedings and return action; 2) the mazy type cooling water chamber 8, are designed to the labyrinth form to strengthen cooling effectiveness, and interior logical cooling water or cooling liquid pass to low voltage terminal in order to intercept high voltage terminal high temperature, and prevent the too high and then inefficacy of hydraulic fluid temperature in the low voltage terminal; 3) high voltage terminal cylinder body 11, high voltage terminal sleeve 13 and high voltage terminal piston 16 surround the hyperbaric chamber 15 that forms, and itself and forming die lower mode cavity lead directly to.The flexible working medium that uses in the hyperbaric chamber 15 is materials such as low-melting alloy, heat-stable ceramic particle.The fusing point of low-melting alloy is very low; Carrying out to be molten into liquid state when the high temperature flexible media is shaped; But after its cooling, can be frozen into solid-stately again, take out, need pressurized cylinder high voltage terminal sleeve 13 and forming die lower mode cavity be designed to straight-through type for ease of the low-melting alloy after will solidifying; Can not have the turning to turn, and open upper end is greater than the bottom caliber size.To head in the forming die as the flexible media of pressure transmission media by high voltage terminal piston 16 during shaping, and directly act on titanium alloy etc materials sheet material or tubing, make its shaping.
In Fig. 1, first hydraulic fluid port 3 and second hydraulic fluid port 23 are connected with oil hydraulic pump, fuel tank through control conversion valve block, oil pipe, control pressurized cylinder feeding, return action.The hydraulic control circuit that control conversion valve block, oil pipe, oil hydraulic pump, fuel tank are formed can use the action of common high temperature hydraulic oil control pressurized cylinder; And needn't worry that temperature is too high and lost efficacy; Be shaping real work flexible media in the hyperbaric chamber 15---low-melting alloy, heat-stable ceramic particle, heat-resisting fine sand, heat resistant oils, macromolecular material; This flexible media gets in the forming die counterdie and directly acts on titanium alloy etc materials plate or pipe fitting, realizes formation technique.
In pressurized cylinder feeding pressurization; It is oil-filled that first hydraulic fluid port 3 is connected oil pump; Second hydraulic fluid port 23 is connected tank drainback, and this moment is because low voltage terminal piston 24 below hydraulic fluid pressures, promote the 16 upwards feedings of high voltage terminal piston greater than top pressure; And then promote also that flexible medias upwards get in the forming die lower mode cavity in the hyperbaric chamber 15, material is formed.Simultaneously, logical all the time cooling water of cooling water chamber 8 or cooling liquid intercept high voltage terminal cylinder body 11 and high voltage terminal piston 16 high temperature and pass to low voltage terminal, and keep the low voltage terminal hydraulic fluid temperature in tolerance zone and do not lose efficacy.
Return in the pressure leak process at pressurized cylinder; Through the adjusting control valve piece; It is oil-filled to make second hydraulic fluid port 23 connect oil pumps, and first hydraulic fluid port 3 is connected tank drainbacks, this moment since low voltage terminal piston 24 top hydraulic fluid pressures greater than below pressure; Drive high voltage terminal piston 16 and return downwards, flexible media is got back to downwards in the pressurized cylinder hyperbaric chamber 15 owing to action of gravity in the forming die lower mode cavity.After component shaping is accomplished, can treat after the low-melting alloy flexible media cooled and solidified directly to take out from the top from hyperbaric chamber 15.Simultaneously, logical all the time cooling water of cooling water chamber 8 or cooling liquid intercept high voltage terminal cylinder body 11 and high voltage terminal piston 16 high temperature and pass to low voltage terminal, and keep the low voltage terminal hydraulic fluid temperature in tolerance zone and do not lose efficacy.
Claims (7)
1. a high temperature is used flexible pressurized cylinder, it is characterized in that, comprises connecting rod, low voltage terminal cylinder body, low voltage terminal piston, mazy type cooling water chamber, high voltage terminal cylinder body, high voltage terminal piston and high voltage terminal sleeve; Low voltage terminal cylinder body, mazy type cooling water chamber, high voltage terminal cylinder body, high voltage terminal sleeve fixed order successively connect, and the low voltage terminal cylinder base is provided with first hydraulic fluid port, and peripheral sidewall is provided with second hydraulic fluid port; The mazy type cooling water chamber is respectively equipped with water intake and water outlet; Connecting rod one end passes low voltage terminal cylinder base center and connects position limit switch; The other end connects the low voltage terminal piston; Low voltage terminal piston another side connects the high voltage terminal piston, and the low voltage terminal piston is positioned at the cavity of low voltage terminal cylinder interior, and the high voltage terminal piston is arranged in the cavity of mazy type cooling water chamber, high voltage terminal cylinder body and high voltage terminal sleeve inner; The low voltage terminal piston outer wall cooperates with low voltage terminal inboard wall of cylinder block size, and the sidewall of high voltage terminal piston cooperates with high voltage terminal cylinder body, high voltage terminal sleeve lining size; The low voltage terminal cylinder body is divided into two cavitys by the low voltage terminal piston, forms low pressure chamber, and high voltage terminal cylinder body, high voltage terminal sleeve and high voltage terminal piston surround the cavity that forms, and forms hyperbaric chamber;
The high temperature flexible media is arranged in the said hyperbaric chamber, and the high temperature flexible media is low-melting alloy, heat-stable ceramic particle, heat-resisting fine sand, heat resistant oils or macromolecular material;
Described connecting rod and low voltage terminal cylinder body contacting part office adopt seal ring to seal; Low voltage terminal piston and low voltage terminal cylinder body contact segment adopt seal ring to seal; Low voltage terminal cylinder body and mazy type cooling water chamber junction use seal ring to seal; High voltage terminal cylinder body and high voltage terminal sleeve junction use high-temperature seal ring to seal; The part that the high voltage terminal piston contacts with the high voltage terminal cylinder body adopts high-temperature seal ring to seal, and the part that contacts with the high voltage terminal sleeve adopts high-temperature seal ring to seal; Mazy type cooling water chamber and high voltage terminal cylinder body junction use high-temperature seal ring to seal;
The seal ring of described connecting rod and low voltage terminal cylinder body contact segment, low voltage terminal piston and low voltage terminal cylinder body contact segment, low voltage terminal cylinder body and mazy type cooling water chamber junction is the seal ring that is used for sealed hydraulic oil; Described high voltage terminal cylinder body is the high-temperature seal ring that is used for sealed hydraulic oil with the seal ring of part, mazy type cooling water chamber and high voltage terminal cylinder body junction that high voltage terminal sleeve junction, high voltage terminal piston contact with the high voltage terminal cylinder body; The seal ring of the part that described high voltage terminal piston contacts with the high voltage terminal sleeve is the high-temperature seal ring that is used to seal the high temperature flexible media.
2. a kind of high temperature according to claim 1 is used flexible pressurized cylinder, it is characterized in that, described connecting rod is a cylindrical body, and there is screw thread an end end, is used to connect the low voltage terminal piston, and the other end passes low voltage terminal cylinder base center, is used to install position limit switch; The low voltage terminal piston is discoid, and one side has boss and helical thread portion, is used to connect the high voltage terminal piston, and another side auger shell pit is used to connect connecting rod; The high voltage terminal piston is the ladder cylindrical body, and the small end end face is beaten groove and is drilled with tapped hole, is used to connect the low voltage terminal piston, and wherein low voltage terminal piston convex platform cooperates with high voltage terminal piston end groove; Low voltage terminal cylinder body, mazy type cooling water chamber, high voltage terminal cylinder body, high voltage terminal barrel bore are all cylindric.
3. a kind of high temperature according to claim 1 is used flexible pressurized cylinder, it is characterized in that, described high voltage terminal cylinder body, high voltage terminal sleeve and high voltage terminal piston adopt high-temperature alloy material to process, and can tolerate 750 ℃ to 850 ℃ high temperature.
4. a kind of high temperature according to claim 1 is used flexible pressurized cylinder, it is characterized in that, described high voltage terminal sleeve lining and high voltage terminal piston termination sprayed coating insulating moulding coating.
5. a kind of high temperature according to claim 1 is used flexible pressurized cylinder, it is characterized in that, described high voltage terminal piston termination installs the heat-stable ceramic liner additional.
6. a kind of high temperature according to claim 1 is used flexible pressurized cylinder, it is characterized in that, described low voltage terminal cylinder body, low voltage terminal piston and connecting rod adopt the plain carbon steel material to process.
7. a kind of high temperature according to claim 1 is used flexible pressurized cylinder, it is characterized in that, uses common heat-resisting hydraulic oil in the described low pressure chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110006852 CN102094857B (en) | 2011-01-13 | 2011-01-13 | High-temperature flexible boosting cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110006852 CN102094857B (en) | 2011-01-13 | 2011-01-13 | High-temperature flexible boosting cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102094857A CN102094857A (en) | 2011-06-15 |
| CN102094857B true CN102094857B (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110006852 Expired - Fee Related CN102094857B (en) | 2011-01-13 | 2011-01-13 | High-temperature flexible boosting cylinder |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106914622B (en) * | 2017-03-13 | 2019-02-01 | 中国科学技术大学 | The method welded with the static pressure static temperature environment such as superelevation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3839863A (en) * | 1973-01-23 | 1974-10-08 | L Frazier | Fluid pressure power plant |
| CN2169722Y (en) * | 1993-04-18 | 1994-06-22 | 周龙生 | High effect energy saving pressure increasing device |
| US5746293A (en) * | 1996-08-02 | 1998-05-05 | Westinghouse Air Brake Company | Pneumatic pressure to hydraulic pressure intensifier mechanism |
| CN2667221Y (en) * | 2003-10-28 | 2004-12-29 | 江阴市华宏液压机械研究所 | Compound hydralic oil cylinder |
| CN101457775A (en) * | 2008-12-23 | 2009-06-17 | 大连海事大学 | Gas-saving gas supercharger for secondary utilizing driving gas |
| CN201588838U (en) * | 2009-12-14 | 2010-09-22 | 中国第一重型机械股份公司 | Cascade hydraulic cylinder |
-
2011
- 2011-01-13 CN CN 201110006852 patent/CN102094857B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3839863A (en) * | 1973-01-23 | 1974-10-08 | L Frazier | Fluid pressure power plant |
| CN2169722Y (en) * | 1993-04-18 | 1994-06-22 | 周龙生 | High effect energy saving pressure increasing device |
| US5746293A (en) * | 1996-08-02 | 1998-05-05 | Westinghouse Air Brake Company | Pneumatic pressure to hydraulic pressure intensifier mechanism |
| CN2667221Y (en) * | 2003-10-28 | 2004-12-29 | 江阴市华宏液压机械研究所 | Compound hydralic oil cylinder |
| CN101457775A (en) * | 2008-12-23 | 2009-06-17 | 大连海事大学 | Gas-saving gas supercharger for secondary utilizing driving gas |
| CN201588838U (en) * | 2009-12-14 | 2010-09-22 | 中国第一重型机械股份公司 | Cascade hydraulic cylinder |
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| CN102094857A (en) | 2011-06-15 |
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