CN111365319B - Novel hydraulic cylinder for hydraulic bulging - Google Patents
Novel hydraulic cylinder for hydraulic bulging Download PDFInfo
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- CN111365319B CN111365319B CN202010221843.XA CN202010221843A CN111365319B CN 111365319 B CN111365319 B CN 111365319B CN 202010221843 A CN202010221843 A CN 202010221843A CN 111365319 B CN111365319 B CN 111365319B
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- cylinder
- oil
- piston rod
- cylinder barrel
- hydraulic
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
-
- 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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention discloses a novel hydraulic cylinder for hydraulic bulging, which comprises a piston rod, a piston, a ball bearing, a rotary cylinder head, a cylinder barrel, a gland, a cylinder cover, a guide sleeve and a flange, wherein the piston rod is fixedly connected with the piston; according to the invention, the oil inlet and the oil outlet are additionally arranged on the cylinder head and the piston rod, and the ball bearing is arranged, so that the processes of reciprocating linear motion, rotary motion and filling oil in the cylinder into a hydraulic bulging workpiece can be simultaneously realized, the simultaneous internal pressurizing, external fixing and moving of the hydraulic bulging workpiece can be realized, the production flow of the hydraulic bulging process can be greatly simplified, and the production efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of metal plastic forming equipment manufacturing, in particular to a novel hydraulic cylinder for hydraulic bulging.
Background
At present, a hydraulic cylinder is an energy conversion device for converting hydraulic energy into mechanical energy as an actuating element in a hydraulic transmission system. The hydraulic motor performs a continuous rotary motion, while the hydraulic cylinder performs a reciprocating motion. The hydraulic cylinder has three types, namely a piston cylinder, a plunger cylinder and a swing cylinder, wherein the piston cylinder and the plunger cylinder realize reciprocating linear motion and output speed and thrust, and the swing cylinder realizes reciprocating swing and outputs angular speed (rotating speed) and torque. The cylinders may be used in combination of two or more or with other mechanisms, other than individually, to accomplish a particular function. The hydraulic cylinder has simple structure and reliable work and is widely applied to a hydraulic system of a machine tool.
The process that present single pneumatic cylinder can be accomplished is more single, also can only realize simple mechanical motion when a plurality of pneumatic cylinders are used in combination, only can output mechanical energy, can't export the hydraulic pressure ability of input with the form of hydraulic pressure ability once more, and traditional pneumatic cylinder can't accomplish the process of output mechanical energy and internal energy simultaneously, has certain limitation when being applied to metal plastic forming and equips the manufacturing field, causes inconvenience in production.
Disclosure of Invention
The invention aims to provide a novel hydraulic cylinder for hydraulic bulging, which solves the problems in the prior art, can simultaneously realize the procedures of reciprocating linear motion and rotary motion and filling oil in the cylinder into a metal workpiece, further improves the hydraulic bulging process, can greatly improve the quality of a hydraulic bulging product, and greatly improves the production efficiency compared with other oil pump supercharging devices.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a novel hydraulic cylinder for hydraulic bulging, which comprises a piston rod, a piston, a ball bearing, a rotary cylinder head, a cylinder barrel, a gland, a cylinder cover, a guide sleeve and a flange, wherein the guide sleeve is connected with the cylinder barrel, the main body part is arranged in the cylinder barrel, the gland is blocked at one end of the cylinder barrel, the outer end of the gland is connected with the flange, the cylinder cover is blocked at the other end of the cylinder barrel, the ball bearing is embedded in the cylinder cover, the rotary cylinder head is inserted into the ball bearing, the rotary cylinder head is axially fixed and can rotate through the ball bearing, the piston is arranged in the cylinder barrel, and is positioned between the guide sleeve and the gland, one end of the piston rod is inserted into the cylinder cover, the other end of the piston rod sequentially penetrates through the guide sleeve, the piston, the gland and the flange and extends out of the cylinder barrel; an oil inlet is formed in the side portion of the flange, an oil pool is arranged in the flange, an oil inlet is formed in the piston rod, an oil path communicated with the oil inlet is axially arranged in the piston rod, external hydraulic oil enters the oil pool through the oil inlet in the flange and then enters the oil path of the piston rod through the oil inlet in the piston rod, communicated oil paths are axially formed in the cylinder cover and the rotary cylinder head, the oil path is communicated with the oil path in the piston rod, and the hydraulic oil enters the oil path of the piston rod so as to fill oil into the bulging pipe fitting through the oil path in the cylinder cover and the rotary cylinder head; the lateral part of the cylinder barrel is provided with an oil inlet to provide mechanical energy for the reciprocating linear motion of the piston rod.
Preferably, the cylinder barrel comprises a cylinder barrel A and a cylinder barrel B, one end of the main body part of the guide sleeve extends into the cylinder barrel A and is fixedly connected with the cylinder barrel A, the cylinder barrel B is located between the other end of the guide sleeve and the gland, the guide sleeve and the gland are provided with connecting flanges, the connecting flanges of the guide sleeve and the gland are fixedly connected through equal-length studs, and the cylinder barrel A and the cylinder barrel B between the guide sleeve and the gland are tightly pressed.
Preferably, the cylinder cover and the cylinder barrel are connected through bolts.
Preferably, the roller bearing and the rotary cylinder head are circumferentially fixed by bolts.
Preferably, sealing rings are arranged between the piston rod and the guide sleeve, the piston and the flange which penetrate through the piston rod.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the novel hydraulic cylinder for hydraulic bulging, the cylinder head and the piston rod are additionally provided with the oil inlet and the oil outlet, and the ball bearing is arranged, so that the processes of reciprocating linear motion and rotary motion and filling oil in the cylinder into a metal workpiece can be simultaneously realized, the simultaneous internal pressurization, external fixation and motion of the workpiece processed by the hydraulic bulging process can be realized, the production flow of the hydraulic bulging process can be greatly simplified, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic sectional view of a hydraulic cylinder for hydraulic bulging according to the present invention;
FIG. 2 is a schematic view of an assembly structure of the novel hydraulic cylinder for hydraulic bulging according to the present invention;
FIG. 3 is a schematic view of a hydraulic bulging process of the novel hydraulic bulging hydraulic cylinder of the present invention;
in the figure: the method comprises the following steps of 1-rotating cylinder head, 2-ball bearing, 3-cylinder A, 4-cylinder cover, 5-cylinder B, 6-equal-length stud, 7-piston, 8-piston rod, 9-flange, 10-gland, 11-O-shaped rubber sealing ring, 12-guide sleeve, 13-oil way, 14-oil inlet valve, 15-hydraulic bulging pipe joint and 16-hydraulic bulging machining piece.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a novel hydraulic cylinder for hydraulic bulging, which aims to solve the problems in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The novel hydraulic cylinder for hydraulic bulging in this embodiment, as shown in fig. 1 and fig. 2, includes a piston rod 8, a piston 7, a ball bearing 2, a rotary cylinder head 1, a cylinder barrel, a gland 10, a cylinder head 4, a guide sleeve 12, and a flange 9; wherein the guide sleeve 12 is connected with the cylinder barrel, the main body part is arranged in the cylinder barrel, and the guide sleeve 12 is used for guiding the piston rod 8; the gland 10 is plugged at one end of the cylinder barrel, and the outer end of the gland 10 is connected with a flange 9 through a bolt; the cylinder cover 4 is plugged at the other end of the cylinder barrel and is connected with the cylinder barrel through a bolt; the ball bearing 2 is embedded in the cylinder cover 4, the rotary cylinder head 1 is inserted into the ball bearing 2, the rotary cylinder head 1 is connected with the ball bearing 2 through a bolt to realize axial fixation and can rotate through the ball bearing 2, and when a to-be-expanded member rotates, the rotary lever head 1 can rotate together; the piston 7 is arranged in the cylinder barrel and is positioned between the guide sleeve 12 and the gland 10, one end of the piston rod 8 is inserted into the cylinder cover 4, and the other end of the piston rod 8 sequentially penetrates through the guide sleeve 12, the piston 7, the gland 10 and the flange 9 and extends out of the cylinder barrel; an oil inlet is formed in the side portion of the flange 9, an oil tank is arranged in the flange 9, an oil inlet is formed in the piston rod 8, an oil path 13 communicated with the oil inlet is axially arranged in the piston rod 8, external hydraulic oil enters the oil tank through the oil inlet in the flange 9 and then enters the oil path 13 of the piston rod 8 through the oil inlet in the piston rod 8, communicated oil paths are axially formed in the cylinder cover 4 and the rotary cylinder head 1 and are communicated with the oil path 13 in the piston rod 8, and the hydraulic oil enters the oil path of the piston rod 8, so that oil is filled into the bulging pipe fitting through the oil paths in the cylinder cover 4 and the rotary cylinder head 1.
In this embodiment, the cylinder includes a cylinder A3 and a cylinder B5, one end of the main body portion of the guide sleeve 12 extends into the cylinder A3 and is fixedly connected with the cylinder A3, the cylinder B5 is located between the other end of the guide sleeve 12 and the gland 10, the guide sleeve 12 and the gland 10 are provided with a connecting flange 9, the connecting flanges 9 of the two are fixedly connected through the stud bolts 6 with equal length, and the cylinder A3 and the cylinder B5 between the two are pressed tightly.
Oil inlets are formed in the side portions of the cylinder barrel A3 and the cylinder barrel B5, hydraulic oil enters the cylinder barrel A3 and the cylinder barrel B5 through oil pipes, and mechanical energy is provided for the reciprocating linear motion of the piston rod 8
In this embodiment, the piston rod 8 and the guide sleeve 12, the piston 7, and the flange 9 that run through the piston rod are all provided with a sealing ring therebetween, and a sealing ring is also provided between the guide sleeve 12 and the inner wall of the cylinder a3, and the sealing rings at other positions are not described in detail in this embodiment in order to realize sealing.
In the embodiment, the piston 7 is freely arranged in the inner cavity of the cylinder barrel and can reciprocate along the axial direction under the action of internal energy, the piston rod 8 penetrates through the cylinder barrel and is driven by the piston 7 to do reciprocating linear motion in a stepped shaft mode, so that the integral mechanical motion of the hydraulic cylinder is realized, hydraulic oil is filled into the cylinder barrel and an oil way in the piston rod 8 through the oil inlet valve 14 to provide internal energy for the mechanical motion of the hydraulic cylinder, and meanwhile, the oil way in the cylinder head 1 can be rotated to be filled into a hydraulic bulging workpiece 16 through the hydraulic bulging pipe joint 15 to provide hydraulic bulging force for a bulging process. Ball bearing 2 is installed to 4 head ends of cylinder cap, and rotatory cylinder head 1 inserts in the bearing, and hydraulic bulging machined part 16 rotates and can drive rotatory barbell head 1 and rotate.
When the hydraulic expansion pipe joint works, the rotary cylinder head 1 is inserted into the hydraulic expansion pipe joint 15, the other end of the hydraulic expansion pipe joint 15 is provided with a notch, a hollow pipe material is inserted into the notch, the interface is sealed by an O-shaped rubber ring 11 to ensure the hydraulic expansion force in the pipe, each oil inlet is connected to an oil pump through an oil pipe, the oil pump is started to fill hydraulic oil into oil paths in the inner cavities of the cylinder barrel and the cylinder barrel 3 and the piston rod 8, the hydraulic pressure is kept within a certain range, the specific numerical value is determined according to the metal type of a workpiece, the internal energy is converted into mechanical energy by the oil pressure in the cylinder barrel 3, the piston 7 is pushed to drive the piston rod 8 to do reciprocating linear motion, the hydraulic oil in the piston rod 8 enters the rotary cylinder head 1 through an internal oil path, the hydraulic expansion workpiece 16 is filled through a high-pressure, the novel hydraulic bulging process is completed by combining internal high pressure and rotation around a central shaft with other external acting force.
The following are specific examples:
referring to the attached drawing 3, to the hollow straight pipe billet of Q345 type, the notch in the high-pressure pipe joint is all inserted at both ends, fixes the pipe billet, and the kneck uses a plurality of O type rubber ring seals 11 to seal, prevents that hydraulic oil from leaking, guarantees that interior pressure is stable, and is further fixed simultaneously, and the rotatory jar head 1 of pneumatic cylinder is inserted to the coupling other end, uses a plurality of O type rubber rings to seal the joint department fixedly equally. After hydraulic oil is filled in the cylinder, the oil in the rod is filled into the inner cavity of a machined part through the pipe joint through an internal oil way, hydraulic bulging internal pressure is provided, the internal pressure is kept in a certain range under the action control of the oil pump, the hydraulic oil can rotate for the cylinder head in an internal force mode through the cylinder head, the cylinder head rotates to drive the machined part pipe blank to rotate through the pipe joint, the machined pipe blank is combined with other external acting force to enable the machined pipe blank to be evenly stressed, and finally, a hydraulic bulging technological process is completed to obtain a novel qualified finished pipe.
The principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above examples is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (5)
1. The utility model provides a novel pneumatic cylinder for hydraulic bulging which characterized in that: the guide sleeve is connected with the cylinder barrel, the main body part of the guide sleeve is arranged in the cylinder barrel, the gland is plugged at one end of the cylinder barrel, the outer end of the gland is connected with the flange, the cylinder cover is plugged at the other end of the cylinder barrel, the ball bearing is embedded in the cylinder cover, the rotary cylinder head is inserted into the ball bearing, the rotary cylinder head is axially fixed and can rotate through the ball bearing, the piston is arranged in the cylinder barrel and is positioned between the guide sleeve and the gland, one end of the piston rod is inserted into the cylinder cover, and the other end of the piston rod sequentially penetrates through the guide sleeve, the piston, the gland and the flange and extends out of the cylinder barrel; an oil inlet is formed in the side portion of the flange, an oil pool is arranged in the flange, an oil inlet is formed in the piston rod, an oil path communicated with the oil inlet is axially arranged in the piston rod, external hydraulic oil enters the oil pool through the oil inlet in the flange and then enters the oil path of the piston rod through the oil inlet in the piston rod, communicated oil paths are axially formed in the cylinder cover and the rotary cylinder head, the oil path is communicated with the oil path in the piston rod, and the hydraulic oil enters the oil path of the piston rod so as to fill oil into the bulging pipe fitting through the oil paths in the cylinder cover and the rotary cylinder head; the lateral part of the cylinder barrel is provided with an oil inlet to provide mechanical energy for the reciprocating linear motion of the piston rod.
2. The new hydraulic cylinder for hydroforming according to claim 1, characterized in that: the cylinder barrel comprises a cylinder barrel A and a cylinder barrel B, one end of the main body part of the guide sleeve extends into the cylinder barrel A and is fixedly connected with the cylinder barrel A, the cylinder barrel B is located between the other end of the guide sleeve and the gland, the guide sleeve and the gland are provided with connecting flanges, the connecting flanges of the guide sleeve and the gland are fixedly connected through equal-length studs, and the cylinder barrel A and the cylinder barrel B are tightly pressed.
3. The new hydraulic cylinder for hydroforming according to claim 1, characterized in that: the cylinder cover is connected with the cylinder barrel through bolts.
4. The new hydraulic cylinder for hydroforming according to claim 1, characterized in that: the ball bearing and the rotary cylinder head are circumferentially fixed through bolts.
5. The new hydraulic cylinder for hydroforming according to claim 1, characterized in that: and sealing rings are arranged among the piston rod, the guide sleeve penetrating through the piston rod, the piston and the flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010221843.XA CN111365319B (en) | 2020-03-26 | 2020-03-26 | Novel hydraulic cylinder for hydraulic bulging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010221843.XA CN111365319B (en) | 2020-03-26 | 2020-03-26 | Novel hydraulic cylinder for hydraulic bulging |
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| Publication Number | Publication Date |
|---|---|
| CN111365319A CN111365319A (en) | 2020-07-03 |
| CN111365319B true CN111365319B (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010221843.XA Active CN111365319B (en) | 2020-03-26 | 2020-03-26 | Novel hydraulic cylinder for hydraulic bulging |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115042465A (en) * | 2022-06-28 | 2022-09-13 | 中国重型机械研究院股份公司 | Isostatic pressing machine |
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| CN104874663A (en) * | 2015-04-21 | 2015-09-02 | 西北工业大学 | Incremental temperature difference bulging device for metal pipes and bulging method |
| CN205362343U (en) * | 2016-02-15 | 2016-07-06 | 天津市骏业不锈钢有限公司 | Compound pipe processingequipment of stainless steel |
| CN205918684U (en) * | 2016-04-25 | 2017-02-01 | 天津优瑞纳斯液压机械有限公司 | Rotatory expansion bend of durable water -cooled with external displacement sensor |
| CN106015160A (en) * | 2016-07-18 | 2016-10-12 | 天津优瑞纳斯液压机械有限公司 | Novel hydraulic cylinder with rotatable and lockable piston rod |
| CN107676330A (en) * | 2017-10-25 | 2018-02-09 | 重庆第二机床厂有限责任公司 | Gas injection type independence double-piston rotating hydraulic cylinder |
| CN108194453A (en) * | 2018-03-22 | 2018-06-22 | 哈尔滨理工大学 | A kind of hydrostatic support sealing fluid cylinder pressure of anti-bias load |
| CN208123161U (en) * | 2018-04-20 | 2018-11-20 | 扬州中旋机械科技有限公司 | A kind of rotary oil cylinder |
| CN110594233A (en) * | 2019-09-03 | 2019-12-20 | 浙江大学 | Hydraulic cylinder structure of hydraulic system with higher frequency response requirement and limited installation space |
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