CN110332172B - Hydraulic actuator with power unit internally arranged in hydraulic rod - Google Patents
Hydraulic actuator with power unit internally arranged in hydraulic rod Download PDFInfo
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- CN110332172B CN110332172B CN201910612936.2A CN201910612936A CN110332172B CN 110332172 B CN110332172 B CN 110332172B CN 201910612936 A CN201910612936 A CN 201910612936A CN 110332172 B CN110332172 B CN 110332172B
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- hydraulic
- oil
- piston rod
- half part
- valve
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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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- 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
- F15B15/18—Combined units comprising both motor and pump
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic actuator with a power unit arranged in a hydraulic rod, wherein a piston rod of a hydraulic cylinder is divided into a front half part and a rear half part, the front half part of the piston rod is separately provided with a cavity, a servo motor and a small axial plunger pump are arranged in the cavity, the inner end surface of a valve block is in threaded connection with the small axial plunger pump, the front half part of the piston rod of the hydraulic cylinder is in threaded connection with the rear half part, the servo motor, the small axial plunger pump and the valve block are integrated in the cavity inside the piston rod, and the rear half part of the piston rod is provided with a first. The invention adopts the technical scheme that the servo motor, the pump, the valve block, the energy accumulator and the oil circuit are arranged in the hydraulic cylinder, the closed hydraulic system integration and lightweight design is adopted to reduce the number of hydraulic elements, the space utilization rate and the convenience of the whole set of device are greatly improved, meanwhile, the pressure of the hydraulic system is adjusted by the energy accumulator acting independently, and the pressure sensor, the displacement sensor and the temperature sensor are adopted for control, so that the hydraulic cylinder has the characteristics of high control precision, safety and reliability.
Description
Technical Field
The invention relates to the field of hydraulic drive, in particular to a hydraulic actuator with a power unit arranged in a hydraulic rod.
Background
With the development of hydraulic technology, hydraulic actuators have come to be used, and a hydraulic actuator is a hydraulic power unit which puts an oil pump, a valve, an oil tank and a hydraulic cylinder together, for example, a FAST hydraulic actuator adopts a highly integrated electro-hydraulic control system: the oil tank, the valve block, the valve, the motor, the control system and other components are integrated together to form an integrated hydraulic power unit which is installed together with the oil cylinder.
Traditional hydraulic actuator has the structure complicacy more, and is mostly external pump station, and such hydraulic actuator receives the influence of place factor more, uses inconvenient to research integrates and lightweight hydraulic actuator is especially necessary.
Disclosure of Invention
In view of the above-described problems, an object of the present invention is to provide a hydraulic actuator in which a power unit is built in a hydraulic rod. The invention mainly places a servo motor, a hydraulic pump, a hydraulic valve block, an energy accumulator and a hydraulic pipeline inside a piston rod of a hydraulic cylinder, fills hydraulic oil into the pipeline and a rod cavity and a rodless cavity of the hydraulic cylinder, adopts a hydraulic closed system to control the extension and retraction of the hydraulic cylinder, releases or absorbs excessive pressure by the energy accumulator, measures the pressure of the system by a pressure sensor, controls the extension and retraction positions of a piston cylinder by a displacement sensor, and measures the oil temperature by a temperature sensor, thereby achieving the accurate control of the pressure.
In order to realize the purpose, the invention is realized according to the following technical scheme:
a hydraulic actuator having a power unit built into a hydraulic ram, comprising: the hydraulic cylinder piston rod is split and comprises a piston rod front half part and a piston rod rear half part, the piston rod front half part is connected with the piston rod rear half part through a bolt, the hydraulic cylinder piston rod front half part is provided with a cavity, a servo motor and an axial plunger pump coaxially connected with the servo motor are arranged in the cavity, the output flow of the axial plunger pump is adjusted by controlling the rotating speed of the servo motor, one side of the axial plunger pump provided with an oil inlet and an oil outlet is fixed on the inner end face of the valve block through a screw, and the one-way valve, the overflow valve, the pressure sensor, the temperature sensor, the normally open two-way reversing valve and the normally closed two-way reversing valve are all inserted on the outer end face of the valve block in an inserting mode, the energy accumulator is arranged at the bottom of the cylinder barrel of the hydraulic cylinder and is separated from the hydraulic oil in the steel cylinder through a partition plate;
the outer end face of the valve block is provided with two pipe joints, each pipe joint is connected with a hose respectively, the other end of each hose is connected with a first oil way and a second oil way of the rear half part of a piston rod of the hydraulic cylinder respectively, the first oil way and the second oil way are arranged inside the rear half part of the piston rod of the hydraulic cylinder and are led to the rodless cavity and the rod cavity respectively, the valve block is arranged in the cavity of the piston rod of the hydraulic cylinder, hydraulic oil is pumped out by an axial plunger, passes through the valve block and reaches the rodless cavity and the rod cavity through the hoses, the first oil way and the second oil way, and then the extension and retraction of the hydraulic cylinder are controlled.
In the technical scheme, the hydraulic actuator further comprises a displacement sensor, the displacement sensor is arranged at the bottom of the cylinder barrel of the hydraulic cylinder and is separated from hydraulic oil in the steel cylinder through a partition plate, and the front end of the displacement sensor is connected with the rear half part of the piston rod.
In the technical scheme, an axial plunger pump oil inlet and an axial plunger pump oil outlet are formed in the inner end face of the valve block, the axial plunger pump oil inlet is communicated with an oil port, formed in the outer end face of the valve block, of the hydraulic control one-way valve through an oil duct inside the valve block, the hydraulic control one-way valve is arranged on the oil port, and the axial plunger pump oil outlet is connected with an oil port, formed in the outer end face of the valve block, of the normally-open two-position two-way reversing valve through an oil duct inside the valve.
Compared with the prior art, the invention has the following advantages:
(1) the servo motor, the pump, the valve block, the energy accumulator and the oil way are arranged inside the hydraulic cylinder, and a hydraulic closed system is adopted, so that the hydraulic closed type hydraulic cylinder has the characteristic of saving equipment space, and the space utilization rate is improved.
(2) The design of the hydraulic system and the integrated and light design of the hydraulic device reduce the flexibility of hydraulic elements and greatly improve the convenience of the whole set of device.
(3) The pressure of the hydraulic system is adjusted by utilizing the energy accumulator acting independently, and the pressure sensor, the displacement sensor and the temperature sensor are adopted for control, so that the hydraulic system has the characteristics of high control precision, safety and reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a schematic perspective partial cross-sectional view of the present invention;
FIG. 3 is a perspective view of the pump station of the present invention;
FIG. 4 is a perspective view of the front half of the piston rod of the hydraulic cylinder of the present invention;
FIG. 5 is a perspective view of the rear half of the piston rod of the hydraulic cylinder of the present invention;
FIG. 6 is a cross-sectional view of FIG. 5;
FIG. 7 is a cross-sectional view of the interior of the valve block;
FIG. 8 is a schematic diagram of the operation of the present invention;
FIG. 9 is a schematic diagram of the valve block oil circuit of the present invention;
in the figure: 1. the hydraulic control system comprises a servo motor, 2, an axial plunger pump, 3-1, a first overflow valve, 3-2, a second overflow valve, 4-1, a normally closed two-position two-way reversing valve, 4-2, a normally open two-position two-way reversing valve, 5, a hydraulic control one-way valve, 6, a one-way valve, 7, a pressure sensor, 8, a valve block, 9, a hydraulic cylinder, 10, an energy accumulator, 11-1, a first pipe joint, 11-2, a second pipe joint, 13, a front half part of a piston rod, 14, a rear half part of the piston rod, 15, a hydraulic cylinder barrel, 16, a hose, 17, a power line, 18, a displacement sensor, 19 and a temperature sensor; a 1: relief valve port, a2, a 9: first pipe joint port, a 3: check valve port, a4, a 7: fabrication hole, a 5: normally open two-position two-way reversing valve oil port, a 6: normally closed two-position two-way reversing valve oil port, a 8: pilot check valve port, a 10: pressure sensor oil port opening, a 11: relief valve port opening, b 1: an axial plunger pump oil inlet, and a b2 axial plunger pump oil outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "radial," "axial," "upper," "lower," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the schematic diagram of a hydraulic actuator with a power unit built in a hydraulic rod shown in fig. 1 and 2, a hydraulic cylinder piston rod is split and comprises a piston rod front half part 13 and a piston rod rear half part 14, the piston rod front half part 13 is connected with the piston rod rear half part 14 through a bolt, the piston rod front half part 13 is a hydraulic cylinder piston rod with a cavity at the bottom, as shown in fig. 4, a servo motor 1 and an axial plunger pump 2 which is connected with and coaxial with the servo motor 1 are arranged in the cavity, the output flow of the axial plunger pump 2 is adjusted by controlling the rotating speed of the servo motor 1, one side of the axial plunger pump 2 provided with an oil inlet and an oil outlet is fixed on the inner end face of a valve block 8 through a screw, a one-way valve 6, an overflow valve, a pressure sensor 7, a temperature sensor 19, a normally open two-position two-way reversing valve 4-2 and a normally closed, the rear half part 14 of the piston rod is provided with a first oil path and a second oil path which are respectively communicated with a rodless cavity and a rod cavity of the hydraulic cylinder 9.
As shown in fig. 5 and 6, the energy accumulator 10 and the displacement sensor 18 are arranged at the bottom of the cylinder barrel of the hydraulic cylinder and separated from the hydraulic oil in the steel cylinder by a partition plate, wherein the front end of the displacement sensor 18 is connected with the rear half part 14 of the piston rod. As shown in fig. 2, a pipe joint 11-1 and a hose 16 connected with the pipe joint are arranged on the outer end face of the valve block 8, and the other end of the hose 16 is provided with a pipe joint 11-2 which is respectively connected and coaxial with a first oil path and a second oil path of the rear half part 14 of the piston rod, as shown in fig. 6, the first oil path and the second oil path are both arranged inside the rear half part 14 of the piston rod of the hydraulic cylinder and respectively led into the rodless cavity and the rod cavity, the valve block 8 is arranged in the cavity of the piston rod of the hydraulic cylinder, hydraulic oil is pressed out by the axial plunger pump 2, passes through the valve block 8, reaches the rodless cavity and the rod cavity through the hose 16 and the first oil path and the second oil path, and. The first overflow valve 3-1, the second overflow valve 3-2, the normally closed two-position two-way reversing valve 4-1, the normally open two-position two-way reversing valve 4-2, the hydraulic control one-way valve 5, the one-way valve 6 and the pressure sensor 7 are connected with the outer end face of the valve block 8 in a threaded insertion mode.
The internal structure of the valve block 8 is shown in fig. 7, 8 and 9, wherein 2 oil port openings are arranged on the inner end surface of the valve block 8, and 11 oil port openings are arranged on the outer end surface. Two oil port openings of the inner end surface of the valve block 8 are oil inlet and outlet openings of the axial plunger pump 2, an oil inlet b1 of the axial plunger pump is communicated with an oil port opening a8 of the hydraulic control one-way valve 5 arranged on the outer end surface of the valve block through an oil passage inside the valve block, and the hydraulic control one-way valve 5 is arranged on the oil port opening. The oil duct connected with the hydraulic control one-way valve 5 is also connected with an oil duct port a1 of an overflow valve 3-1 arranged on the outer end face of the valve block, and the overflow valve 3-1 is arranged on the oil duct port; an oil outlet b2 of the axial plunger pump is connected with an oil port a5 of a normally open two-position two-way reversing valve 4-2 arranged on the outer end face of the valve block through an oil passage inside the valve block, the oil port is provided with the normally open two-position two-way reversing valve 4-2, and the oil passage connected with the normally open two-position two-way reversing valve 4-2 is also connected with an oil port a3 of a check valve arranged on the outer end face of the valve block; the outer end face of the valve block is also provided with 3 overflow valve oil port openings a11, a pressure sensor oil port opening a10 and a normally closed two-position two-way reversing valve oil port opening a6 which are respectively connected with an oil passage a8 of the hydraulic control one-way valve 5 through an oil passage in the valve block, and the 3 oil port openings are respectively provided with an overflow valve 3-2, a pressure sensor 7 and a normally closed two-position two-way reversing valve 4-1. Except the technical hole a7, the other oil passages for processing on the valve block are all arranged on the circumferential surface of the valve block, and the oil passages are blocked by hexagon socket head screws. In fig. 9: a 1-a 11 oil channel is arranged on one surface; b 1-b 2 oil ports are arranged on the other side; the "X" port is on the circumferential surface.
The working principle of the invention is shown in figure 8, when the normally closed two-position two-way reversing valve 4-1 is in a normal state and the normally open two-position two-way reversing valve 4-2 is in a normal state, the oil in the rodless cavity of the hydraulic cylinder enters a loop through an oil passage A and passes through the small axial plunger pump 2, the hydraulic control one-way valve 5 and the oil passage B to be communicated with the rod cavity of the hydraulic cylinder, and the hydraulic cylinder retracts; when the normally open two-position two-way reversing valve 4-2 is in the power-on state, oil in a rod cavity of the hydraulic cylinder enters a rodless cavity of the hydraulic cylinder through the oil duct B, the normally open two-position two-way reversing valve 4-1 and the oil duct A, and the hydraulic cylinder extends out.
The method for controlling the system pressure by adopting the hydraulic closed system and integrating the pressure sensor 7 and the method for absorbing and supplementing the pressure by the energy accumulator 10 also has important influence, and the safety coefficient of the system is improved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (3)
1. A hydraulic actuator having a power unit built into a hydraulic ram, comprising: the hydraulic cylinder piston rod is split and comprises a piston rod front half part and a piston rod rear half part, the piston rod front half part is connected with the piston rod rear half part through a bolt, the hydraulic cylinder piston rod front half part is provided with a cavity, a servo motor and an axial plunger pump coaxially connected with the servo motor are arranged in the cavity, the output flow of the axial plunger pump is adjusted by controlling the rotating speed of the servo motor, one side of the axial plunger pump provided with an oil inlet and an oil outlet is fixed on the inner end face of the valve block through a screw, and the one-way valve, the overflow valve, the pressure sensor, the temperature sensor, the normally open two-way reversing valve and the normally closed two-way reversing valve are all inserted on the outer end face of the valve block in an inserting mode, the energy accumulator is arranged at the bottom of the cylinder barrel of the hydraulic cylinder and is separated from the hydraulic oil in the steel cylinder through a partition plate;
the outer end face of the valve block is provided with two pipe joints, each pipe joint is connected with a hose respectively, the other end of each hose is connected with a first oil way and a second oil way of the rear half part of a piston rod of the hydraulic cylinder respectively, the first oil way and the second oil way are arranged inside the rear half part of the piston rod of the hydraulic cylinder and are led to the rodless cavity and the rod cavity respectively, the valve block is arranged in the cavity of the piston rod of the hydraulic cylinder, hydraulic oil is pumped out by an axial plunger, passes through the valve block and reaches the rodless cavity and the rod cavity through the hoses, the first oil way and the second oil way, and then the extension and retraction of the hydraulic cylinder are controlled.
2. The hydraulic actuator according to claim 1, further comprising a displacement sensor disposed at the bottom of the cylinder tube of the hydraulic cylinder and separated from the hydraulic oil in the cylinder tube by a partition plate, wherein the front end of the displacement sensor is connected to the rear half of the piston rod.
3. The hydraulic actuator according to claim 1, wherein the valve block has an axial plunger pump oil inlet and an axial plunger pump oil outlet on an inner end surface thereof, the axial plunger pump oil inlet being connected to an oil port of the hydraulic check valve on an outer end surface thereof through an inner oil passage of the valve block, wherein the hydraulic check valve is disposed on the oil port, and the axial plunger pump oil outlet being connected to an oil port of the normally open two-way selector valve on an outer end surface thereof through an inner oil passage of the valve block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910612936.2A CN110332172B (en) | 2019-07-09 | 2019-07-09 | Hydraulic actuator with power unit internally arranged in hydraulic rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910612936.2A CN110332172B (en) | 2019-07-09 | 2019-07-09 | Hydraulic actuator with power unit internally arranged in hydraulic rod |
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| Publication Number | Publication Date |
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| CN110332172A CN110332172A (en) | 2019-10-15 |
| CN110332172B true CN110332172B (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910612936.2A Active CN110332172B (en) | 2019-07-09 | 2019-07-09 | Hydraulic actuator with power unit internally arranged in hydraulic rod |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110887417B (en) * | 2019-12-09 | 2021-07-30 | 燕山大学 | Anti-interception missile capable of bouncing on water surface |
| CN112901599B (en) * | 2021-01-26 | 2022-11-29 | 中车青岛四方机车车辆股份有限公司 | Hydraulic power unit, carriage lifting system and rail vehicle |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH094608A (en) * | 1995-06-21 | 1997-01-07 | Shin Caterpillar Mitsubishi Ltd | Hydraulic cylinder |
| CN201405204Y (en) * | 2009-04-23 | 2010-02-17 | 汉川机床集团有限公司 | Rotary exchanging device for double-exchange workbench of horizontal machining centre |
| JP5458120B2 (en) * | 2012-01-26 | 2014-04-02 | 株式会社ロブテックス | Actuator |
| US9562547B2 (en) * | 2014-08-29 | 2017-02-07 | Abb Schweiz Ag | Electric hydraulic actuator |
| CN204458587U (en) * | 2014-12-11 | 2015-07-08 | 上海黎航液压设备有限公司 | A kind of lifting land column movement |
| CN105257616B (en) * | 2015-11-10 | 2017-10-31 | 湖北航天技术研究院总体设计所 | A kind of integrated electro-hydraulic servo activation configuration |
| CN206723168U (en) * | 2017-07-11 | 2017-12-08 | 宁波创基机械有限公司 | A kind of miniature hydraulic power unit |
| CN207762048U (en) * | 2018-01-12 | 2018-08-24 | 浙江工业职业技术学院 | A kind of double acting hydraulic cylinder of built-in accumulator |
| CN108412823A (en) * | 2018-05-09 | 2018-08-17 | 登派液压技术（上海）有限公司 | A kind of single cylinder positioning power unit |
| CN108506286A (en) * | 2018-07-02 | 2018-09-07 | 福建工程学院 | A kind of driving motor directly drives the hydraulic energy-saving system of pump control cylinder with differential effect |
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Effective date of registration: 20211102 Address after: Room 1-101a309, building 1, science and technology entrepreneurship building, No. 19, Yangshan Road, economic and Technological Development Zone, Xuzhou, Jiangsu 221000 Patentee after: Weierlide (Xuzhou) Construction Machinery Technology Research Institute Co.,Ltd. Address before: 066004 No. 438 west section of Hebei Avenue, seaport District, Hebei, Qinhuangdao Patentee before: Yanshan University |