CN117780723A - Fluid pressure actuator integrating pulling and torsion - Google Patents
Fluid pressure actuator integrating pulling and torsion Download PDFInfo
- Publication number
- CN117780723A CN117780723A CN202410182302.9A CN202410182302A CN117780723A CN 117780723 A CN117780723 A CN 117780723A CN 202410182302 A CN202410182302 A CN 202410182302A CN 117780723 A CN117780723 A CN 117780723A
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- Prior art keywords
- torsion
- output shaft
- sleeve
- fluid pressure
- nipple
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- 239000012530 fluid Substances 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000006073 displacement reaction Methods 0.000 claims abstract description 40
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 73
- 238000007789 sealing Methods 0.000 claims description 48
- 239000010720 hydraulic oil Substances 0.000 claims description 15
- 210000002445 nipple Anatomy 0.000 claims 13
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000005389 magnetism Effects 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Abstract
The invention relates to the technical field of industrial actuators and discloses a fluid pressure actuator with an integrated tension and torsion function, which comprises a torsion assembly and a telescopic assembly, wherein the telescopic assembly is connected with the torsion assembly through a shaft coupling sleeve, the output end of the torsion assembly is connected with the output end of the telescopic assembly, the output end of the telescopic assembly extends out of an output shaft, the torsion assembly comprises a swinging hydraulic cylinder, a displacement detection piece and a rotation angle detection piece, the displacement detection piece is arranged on the outer wall of the bottom end of the swinging hydraulic cylinder and used for detecting the radial displacement distance of the output end of the actuator, the rotation detection piece is arranged on the outer wall of the tail end of the swinging hydraulic cylinder, and the rotation detection piece is used for detecting the rotation angle of the output shaft of the actuator. The corrugated sleeve is arranged on the outer side of the output shaft, and the corrugated sleeve is sleeved on the output shaft, so that the contact between the output shaft and the hydraulic cylinder can be reduced, and further the problems that vortex is caused and additional friction resistance is increased due to the fact that the output shaft rotates around the output shaft in a reciprocating manner in liquid are avoided.
Description
Technical Field
The invention relates to the field of industrial actuators, in particular to a pull-torsion integrated fluid pressure actuator.
Background
The pull-torsion integrated fluid pressure actuator is an industrial actuator, combines two functions of a swinging hydraulic cylinder and a telescopic hydraulic cylinder, can realize independent reciprocating swinging, independent telescopic or combined actions of the two, and is used for controlling and operating various mechanical equipment.
The integrated design is adopted, the pull rod and the torsion bar are combined in one hydraulic cylinder, and the reciprocating swing and the telescopic action can be realized on one output shaft, so that the integrated hydraulic rod is widely applied to various mechanical equipment, especially occasions needing high integration and small occupied space due to the characteristics of compact structure, light weight, strong robustness and the like.
The telescopic rod is connected with the rod body through the piston, so when one end of the torsion bar acts, the reciprocating swing is transmitted to the output shaft and/or the piston, so that the reciprocating swing can cause vortex and increase additional friction resistance around the reciprocating swing in liquid, meanwhile, the output shaft receives the resistance of the liquid when rotating, the resistance is in direct proportion to the viscosity of the liquid, the viscosity of hydraulic oil can be increased due to friction and recycling along with use, the resistance and energy loss of oil are further increased, the efficiency of a system is reduced, the actuator is unstable to execute along with the use duration, and the reliability and the service life of the system are affected.
Disclosure of Invention
The invention provides a pull-torsion integrated fluid pressure actuator, which solves the technical problems that in the related art, reciprocating swing is transmitted to an output shaft and/or a piston, so that vortex flow is caused and additional friction resistance is increased when the fluid pressure actuator reciprocates around the fluid pressure actuator, the resistance and energy loss of oil are increased, and the efficiency of a system is reduced.
The invention provides a fluid pressure actuator with a pulling and twisting integrated structure, which comprises a torsion assembly and a telescopic assembly, wherein the telescopic assembly is connected with the torsion assembly through a shaft coupling sleeve, the output end of the torsion assembly is connected with the output end of the telescopic assembly, and the output end of the telescopic assembly extends out of an output shaft;
the torsion assembly comprises a swing hydraulic cylinder, a displacement detection piece and a rotation angle detection piece, wherein the displacement detection piece is arranged on the outer wall of the bottom end of the swing hydraulic cylinder and used for detecting the radial displacement distance of the output end of the actuator;
the telescopic assembly comprises a cylinder body, a piston disc and a glib group, the glib group is arranged at four corners of the cylinder body, the piston disc is arranged on the output shaft, the piston disc is slidably connected in the cylinder body, the end part of the glib group is connected with an oil delivery end, and the input direction of the oil delivery of the glib group is tangential to the circular surface of the vertical section of the cylinder body;
sealing shaft sleeves are arranged on two sides of the cylinder body, corrugated sleeves are arranged on the sealing shaft sleeves on two sides and the end faces of two sides of the piston disc, and the corrugated sleeves are zoomed when the piston disc moves in the cylinder body.
Further, the corrugated sleeve comprises a corrugated pipe and a magnetic detection ring, and the magnetic detection ring is inserted into the pipe wall of the corrugated pipe.
Further, a magnetic detection sleeve is arranged on the inner side wall of the cylinder body, and the length direction of the magnetic detection sleeve is perpendicular to the ring surface where the magnetic detection ring is located.
Further, the displacement detection piece comprises a displacement sensor and a displacement sliding seat, wherein the displacement sliding seat is arranged on the outer wall of the bottom end of the swing hydraulic cylinder, and the detection end of the displacement sensor is in sliding connection with the displacement sliding seat.
Further, the rotation detecting piece comprises a coupler and an angle sensor, wherein the coupler is connected to the shaft end of the swing hydraulic cylinder, and the detecting end of the angle sensor is connected with the coupler.
Further, the sealing shaft sleeve comprises a first sealing shaft sleeve and a second sealing shaft sleeve, the first sealing shaft sleeve and the second sealing shaft sleeve are arranged on the outer walls of the two sides of the cylinder body, and sealing rings are arranged at the joints of the first sealing shaft sleeve, the second sealing shaft sleeve and the output shaft.
Further, the oil nozzle group comprises an oil nozzle A, an oil nozzle B, an oil nozzle C and an oil nozzle D, and the oil nozzle A and the oil nozzle C and the oil nozzle B and the oil nozzle D act in a combined way.
Further, hydraulic oil is input into the cylinder body through the oil nozzle A and the oil nozzle C to rotate anticlockwise, and hydraulic oil is input into the cylinder body through the oil nozzle B and the oil nozzle D to rotate clockwise.
Further, the two sides of the shaft coupling shaft sleeve are provided with supporting sealing rings, and the output shaft is inserted into the supporting sealing rings.
Further, the inner side walls of the first sealing shaft sleeve and the second sealing shaft sleeve are provided with a movable sliding sleeve, and the output shaft is inserted into the movable sliding sleeve.
The invention has the beneficial effects that: the outside of this fluid pressure actuator at the output shaft is equipped with the ripple cover, and the ripple cover is overlapped and is located on the output shaft, reducible output shaft and pneumatic cylinder between the contact, and then avoided can arouse the problem of vortex and increase extra frictional resistance because of the output shaft is around its self reciprocal rotation in liquid, is equipped with magnetism detection ring on the ripple cover, and magnetism detection ring is through by torsion volume regulation and control fluid input direction, offsets the turbulent flow phenomenon that hydraulic oil appears through the input direction, reduces the resistance of fluid, avoids energy loss.
Drawings
FIG. 1 is a schematic illustration of a pull-torsion integrated fluid pressure actuator according to the present invention;
FIG. 2 is a schematic view of an assembled construction of the torsion assembly of FIG. 1 of the present invention;
FIG. 3 is a schematic view in partial cross-section of the telescoping assembly of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic view of the structure of the present invention in vertical section after half-section of FIG. 1;
FIG. 5 is a side view of the telescoping assembly of FIG. 3 of the present invention;
fig. 6 is a schematic view of the vertical section of the bellows of fig. 4 according to the present invention.
In the figure: 100. a torsion assembly; 110. a protective shell; 120. a swing hydraulic cylinder; 130. a displacement detecting member; 131. a displacement sensor; 132. a displacement sliding seat; 140. sealing cover; 150. a rotation angle detection member; 151. a coupling; 152. an angle sensor; 160. sealing the shaft sleeve; 200. a telescoping assembly; 210. a cylinder; 220. a first sealing sleeve; 230. a second sealing sleeve; 240. a piston disc; 250. a corrugated sleeve; 251. a bellows; 252. a magnetic detection ring; 260. a magnetic detection sleeve; 300. an output shaft; 400. a nozzle group; 410. a nozzle tip A; 420. a nozzle B; 430. a nozzle C; 440. a nozzle D; 500. and a shaft coupling sleeve.
Detailed Description
The subject matter described herein will now be discussed with reference to example embodiments. It is to be understood that these embodiments are merely discussed so that those skilled in the art may better understand and implement the subject matter described herein and that changes may be made in the function and arrangement of the elements discussed without departing from the scope of the disclosure herein. Various examples may omit, replace, or add various procedures or components as desired. In addition, features described with respect to some examples may be combined in other examples as well.
Referring to fig. 1-6, a fluid pressure actuator with integrated tension and torsion includes a torsion assembly 100 and a telescopic assembly 200, wherein the telescopic assembly 200 is connected with the torsion assembly 100 through a coupling sleeve 500, an output end of the torsion assembly 100 is connected with an output end of the telescopic assembly 200, and an output end of the telescopic assembly 200 extends out of an output shaft 300;
the two sides of the shaft coupling sleeve 500 are provided with supporting sealing rings, and the output shaft 300 is inserted into the supporting sealing rings;
the torsion assembly 100 comprises a swing hydraulic cylinder 120, a displacement detection member 130 and a rotation angle detection member 150, wherein the displacement detection member 130 is arranged on the outer wall of the bottom end of the swing hydraulic cylinder 120, the displacement detection member 130 is used for detecting the radial displacement distance of the output end of an actuator, the rotation detection member is arranged on the outer wall of the tail end of the swing hydraulic cylinder 120, and the rotation detection member is used for detecting the rotation angle of the output shaft 300 of the actuator;
the torsion assembly 100 further comprises a protective shell 110, wherein a sealing cover 140 is arranged on one side of the protective shell 110 far away from the shaft coupling sleeve 500, and the displacement detection piece 130 and the angle detection piece are both arranged on the outer wall of the sealing cover 140;
the swing hydraulic cylinder 120 comprises a hydraulic cylinder body 210, a swing blade and an oil inlet nozzle, wherein the oil inlet nozzle is arranged on the outer wall of the hydraulic cylinder body 210, a swing shaft is arranged in the swing blade, and the swing shaft is connected with the output shaft 300 through a sealing shaft sleeve 160;
the oil inlet nozzle is connected with a pump oil source, the pump oil source is used for inputting high-pressure oil into the hydraulic cylinder body 210 and pushing the swing blades to rotate, and the swing angle of the swing blades is smaller than or equal to 350 degrees;
the telescopic assembly 200 comprises a cylinder 210, a piston disc 240 and a glib group 400, wherein the glib group 400 is arranged at four corners of the cylinder 210, the piston disc 240 is arranged on the output shaft 300, the piston disc 240 is slidably connected in the cylinder 210, the end part of the glib group 400 is connected with an oil delivery end, and the oil delivery input direction of the glib group 400 is tangential to a circular surface where the vertical section of the cylinder 210 is positioned;
the middle part of the piston disc 240 is provided with a bearing seat which is sleeved on the output shaft 300;
sealing shaft sleeves 160 are arranged on two sides of the cylinder 210, corrugated sleeves 250 are arranged on two side end surfaces of the sealing shaft sleeves 160 and the piston disc 240 on two sides, and the corrugated sleeves 250 are scaled along with the movement of the piston disc 240 in the cylinder 210;
the bellows 250 includes bellows 251 and magnetism detection ring 252, and magnetism detection ring 252 alternates in the pipe wall of bellows 251, is equipped with magnetism detection cover 260 at the inside wall of cylinder body 210, and magnetism detection cover 260's length direction is perpendicular with magnetism detection ring 252's anchor ring.
A supporting frame is provided between the bellows 250 and the output shaft 300 for maintaining a peripheral distance between an inner wall of the bellows 250 and an outer shaft wall of the output shaft 300;
when the magnetic detection ring 252 in the corrugated pipe 251 is twisted due to the turbulent flow of the oil, the magnetic detection sleeve 260 detects the sleeve, namely, the twisting action is detected through magnetism, hydraulic oil is input through the oil nozzle A410 and the oil nozzle C430 of the oil nozzle group 400 when clockwise twisting occurs, the twisting is counteracted through a anticlockwise hydraulic cylinder, and the hydraulic oil is input through the oil nozzle B420 and the oil nozzle D440 of the oil nozzle group 400 when anticlockwise twisting occurs;
meanwhile, the magnetic detection ring 252 compresses along with the corrugated pipe 251, and the magnetic detection sleeve 260 can also detect the compression amount, namely the displacement amount of the piston end, for assisting the displacement detection of the displacement detection member 130;
the displacement detecting member 130 includes a displacement sensor 131 and a displacement sliding seat 132, the displacement sliding seat 132 is mounted on the outer wall of the bottom end of the swing hydraulic cylinder 120, and the detecting end of the displacement sensor 131 is slidably connected in the displacement sliding seat 132.
The rotation detecting member includes a coupling 151 and an angle sensor 152, the coupling 151 is connected to the shaft end of the swing hydraulic cylinder 120, that is, the shaft end of the swing shaft is connected to the coupling 151, and the detecting end of the angle sensor 152 is connected to the coupling 151.
The displacement sensor 131 and the angle sensor 152 are both in the prior art, and the flow of the working principle is not described herein;
the sealing shaft sleeve 160 comprises a first sealing shaft sleeve 220 and a second sealing shaft sleeve 230, the first sealing shaft sleeve 220 and the second sealing shaft sleeve 230 are installed on the outer walls of the two sides of the cylinder body 210, sealing rings are arranged at the joints of the first sealing shaft sleeve 220, the second sealing shaft sleeve 230 and the output shaft 300, a movable sliding sleeve is arranged on the inner side walls of the first sealing shaft sleeve 220 and the second sealing shaft sleeve 230, and the output shaft 300 is inserted into the movable sliding sleeve.
The oil nozzle group 400 comprises an oil nozzle A410, an oil nozzle B420, an oil nozzle C430 and an oil nozzle D440, wherein the oil nozzle A410, the oil nozzle C430, the oil nozzle B420 and the oil nozzle D440 are combined to act, hydraulic oil is input into the cylinder 210 through the oil nozzle A410 and the oil nozzle C430 to rotate anticlockwise, and hydraulic oil is input into the cylinder 210 through the oil nozzle B420 and the oil nozzle D440 to rotate clockwise.
The output shaft 300 of the present fluid pressure actuator is connected to the input of the device, and its specific working principle is as follows:
the oil input of the swing hydraulic cylinder 120 drives the swing blade to rotate, and the sealing shaft sleeve 160 drives the output shaft 300 to rotate, so that the reciprocating rotation of the output shaft 300 is realized;
the coupler 151 and the angle sensor 152 connected with the coupler are driven to act during rotation, so that the rotation detection of the output shaft 300 is realized;
when the output shaft 300 rotates, the output shaft 300 is protected by the corrugated sleeve 250, so that vortex and additional friction resistance are prevented from being caused when the output shaft 300 rotates around the output shaft 300 in a reciprocating manner in hydraulic oil;
meanwhile, when hydraulic oil is unevenly input or discharged, an oil turbulence phenomenon occurs, at the moment, when the magnetic detection ring 252 in the corrugated pipe 251 is twisted due to the turbulence of the oil, the magnetic detection ring 252 is provided with a detection magnetic block, the magnetic detection ring 260 detects the deflection of the magnetic block on the vertical section where the magnetic detection ring 252 is positioned, namely, the twisting action is detected through magnetism, when clockwise twisting occurs, hydraulic oil is input through the oil nozzle A410 and the oil nozzle C430 of the oil nozzle group 400, the twisting is counteracted through a counterclockwise hydraulic cylinder, and similarly, when anticlockwise twisting occurs, hydraulic oil is input through the oil nozzle B420 and the oil nozzle D440 of the oil nozzle group 400, and the twisting is counteracted through a clockwise hydraulic cylinder;
when the piston disc 240 moves, the oil nozzle A410, the oil nozzle B420, the oil nozzle C430 and the oil nozzle D440 in the oil nozzle group 400 are used for intensively inputting hydraulic oil under the condition of turbulence, so that the piston disc 240 can be quickly pushed to move;
when the piston disc 240 moves, the oil input speed and the oil input quantity can be controlled by controlling the oil transportation sources connected with the oil nozzle A410, the oil nozzle B420, the oil nozzle C430 and the oil nozzle D440;
the device can quickly twist and stretch according to the control command, the action of the actuator is stable, the resistance of oil liquid is reduced, the energy loss is reduced, and the efficiency of the system is further improved.
The embodiment has been described above with reference to the embodiment, but the embodiment is not limited to the above-described specific implementation, which is only illustrative and not restrictive, and many forms can be made by those of ordinary skill in the art, given the benefit of this disclosure, are within the scope of this embodiment.
Claims (10)
1. The fluid pressure actuator integrating tension and torsion is characterized by comprising a torsion assembly (100) and a telescopic assembly (200), wherein the telescopic assembly (200) is connected with the torsion assembly (100) through a shaft coupling sleeve (500), the output end of the torsion assembly (100) is connected with the output end of the telescopic assembly (200), and the output end of the telescopic assembly (200) extends out of an output shaft (300);
the torsion assembly (100) comprises a swing hydraulic cylinder (120), a displacement detection piece (130) and a rotation angle detection piece (150), wherein the displacement detection piece (130) is arranged on the outer wall of the bottom end of the swing hydraulic cylinder (120), the displacement detection piece (130) is used for detecting the radial displacement distance of the output end of the actuator, the rotation detection piece is arranged on the outer wall of the tail end of the swing hydraulic cylinder (120), and the rotation detection piece is used for detecting the rotation angle of the output shaft (300) of the actuator;
the telescopic assembly (200) comprises a cylinder body (210), a piston disc (240) and a glib group (400), the glib group (400) is arranged at four corners of the cylinder body (210), the piston disc (240) is arranged on the output shaft (300), the piston disc (240) is slidably connected in the cylinder body (210), the end part of the glib group (400) is connected with an oil delivery end, and the oil delivery input direction of the glib group (400) is tangential to a circular surface where the vertical section of the cylinder body (210) is located;
sealing shaft sleeves (160) are arranged on two sides of the cylinder body (210), corrugated sleeves (250) are arranged on two side end faces of the sealing shaft sleeves (160) on two sides and the piston disc (240), and the corrugated sleeves (250) are scaled when the piston disc (240) moves in the cylinder body (210).
2. The tension-torsion integrated fluid pressure actuator of claim 1, wherein the bellows (250) comprises a bellows (251) and a magnetic sensing ring (252), the magnetic sensing ring (252) being inserted into a wall of the bellows (251).
3. The fluid pressure actuator integrated with tension and torsion according to claim 2, wherein a magnetic detection sleeve (260) is arranged on the inner side wall of the cylinder body (210), and the length direction of the magnetic detection sleeve (260) is perpendicular to the ring surface where the magnetic detection ring (252) is located.
4. A pull-torsion integrated fluid pressure actuator according to claim 3, wherein the displacement detecting member (130) comprises a displacement sensor (131) and a displacement sliding seat (132), the displacement sliding seat (132) is mounted on the outer wall of the bottom end of the swing hydraulic cylinder (120), and the detecting end of the displacement sensor (131) is slidably connected in the displacement sliding seat (132).
5. The pull-torsion integrated fluid pressure actuator according to claim 4, wherein the rotation detecting member includes a coupler (151) and an angle sensor (152), the coupler (151) is connected to the shaft end of the swing cylinder (120), and the detecting end of the angle sensor (152) is connected to the coupler (151).
6. The tension-torsion integrated fluid pressure actuator of claim 5, wherein the sealing sleeve (160) comprises a first sealing sleeve (220) and a second sealing sleeve (230), the first sealing sleeve (220) and the second sealing sleeve (230) are mounted on two outer walls of the cylinder (210), and sealing rings are arranged at the joints of the first sealing sleeve (220), the second sealing sleeve (230) and the output shaft (300).
7. The pull-torsion integrated fluid pressure actuator of claim 6, wherein the nipple set (400) comprises nipple a (410), nipple B (420), nipple C (430), and nipple D (440), and wherein nipple a (410) and nipple C (430), nipple B (420), and nipple D (440) act in combination.
8. The pull-torsion integrated fluid pressure actuator of claim 7, wherein hydraulic oil fed into the cylinder (210) from the oil nipple a (410) and the oil nipple C (430) rotates counterclockwise, and hydraulic oil fed into the cylinder (210) from the oil nipple B (420) and the oil nipple D (440) rotates clockwise.
9. The fluid pressure actuator integrated with tension and torsion according to claim 8, wherein the two sides of the coupling sleeve (500) are provided with supporting seal rings, and the output shaft (300) is inserted into the supporting seal rings.
10. The fluid pressure actuator of claim 9, wherein the inner side walls of the first sealing sleeve (220) and the second sealing sleeve (230) are provided with a moving sliding sleeve, and the output shaft (300) is inserted into the moving sliding sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410182302.9A CN117780723B (en) | 2024-02-19 | 2024-02-19 | Fluid pressure actuator integrating pulling and torsion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410182302.9A CN117780723B (en) | 2024-02-19 | 2024-02-19 | Fluid pressure actuator integrating pulling and torsion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117780723A true CN117780723A (en) | 2024-03-29 |
| CN117780723B CN117780723B (en) | 2024-06-07 |
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ID=90389175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410182302.9A Active CN117780723B (en) | 2024-02-19 | 2024-02-19 | Fluid pressure actuator integrating pulling and torsion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117780723B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5782161A (en) * | 1995-12-28 | 1998-07-21 | Unisia Jecs Corporation | Axial plunger pump with a partition between the lubricating chamber and the working fluid chamber |
| US6361286B1 (en) * | 1996-09-09 | 2002-03-26 | Hitachi, Ltd | Fuel pump |
| JP2013113397A (en) * | 2011-11-30 | 2013-06-10 | Psc Kk | Fluid pressure actuator |
| CN204344550U (en) * | 2014-12-11 | 2015-05-20 | 中国直升机设计研究所 | A kind of pull and torsion test actuator |
| CN110284891A (en) * | 2019-07-09 | 2019-09-27 | 浙江大学 | A kind of active shield machine telescopic oscillating system |
| KR102159962B1 (en) * | 2020-03-04 | 2020-09-25 | 에프엠씨파워텍 주식회사 | Hydraulic and pneumatic cylinder |
-
2024
- 2024-02-19 CN CN202410182302.9A patent/CN117780723B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5782161A (en) * | 1995-12-28 | 1998-07-21 | Unisia Jecs Corporation | Axial plunger pump with a partition between the lubricating chamber and the working fluid chamber |
| US6361286B1 (en) * | 1996-09-09 | 2002-03-26 | Hitachi, Ltd | Fuel pump |
| JP2013113397A (en) * | 2011-11-30 | 2013-06-10 | Psc Kk | Fluid pressure actuator |
| CN204344550U (en) * | 2014-12-11 | 2015-05-20 | 中国直升机设计研究所 | A kind of pull and torsion test actuator |
| CN110284891A (en) * | 2019-07-09 | 2019-09-27 | 浙江大学 | A kind of active shield machine telescopic oscillating system |
| KR102159962B1 (en) * | 2020-03-04 | 2020-09-25 | 에프엠씨파워텍 주식회사 | Hydraulic and pneumatic cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117780723B (en) | 2024-06-07 |
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