CN115507086A - Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback - Google Patents

Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback Download PDF

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Publication number
CN115507086A
CN115507086A CN202211336824.7A CN202211336824A CN115507086A CN 115507086 A CN115507086 A CN 115507086A CN 202211336824 A CN202211336824 A CN 202211336824A CN 115507086 A CN115507086 A CN 115507086A
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CN
China
Prior art keywords
chamber
valve
piston rod
pressure
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211336824.7A
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Chinese (zh)
Inventor
周如林
乔子石
王树胜
张阳
卢海承
赵玉贝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Meike Tianma Automation Technology Co Ltd
Beijing Tianma Intelligent Control Technology Co Ltd
Original Assignee
Beijing Meike Tianma Automation Technology Co Ltd
Beijing Tianma Intelligent Control Technology Co Ltd
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Publication date
Application filed by Beijing Meike Tianma Automation Technology Co Ltd, Beijing Tianma Intelligent Control Technology Co Ltd filed Critical Beijing Meike Tianma Automation Technology Co Ltd
Priority to CN202211336824.7A priority Critical patent/CN115507086A/en
Publication of CN115507086A publication Critical patent/CN115507086A/en
Pending legal-status Critical Current

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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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor

Abstract

The invention provides a hydraulic device with mechanical position pilot feedback and a digital hydraulic cylinder, wherein the hydraulic device comprises: the pilot valve, pneumatic cylinder and driving medium, the pilot valve includes first valve body and first case, first case cartridge is on first valve body, and first case is portable along the axis of first case, the pneumatic cylinder includes cylinder body and piston rod, the first end of piston rod is located the cylinder body and portable along the extending direction of cylinder body, the second end of piston rod is located outside the cylinder body, the pilot valve links to each other with the pneumatic cylinder, remove with the actuating piston rod, the first end of driving medium links to each other with the first end of first case, the second end of driving medium links to each other with the first end of piston rod, the pilot valve is used for the axial displacement of actuating piston rod along the piston rod, the piston rod removes and is used for driving the axial displacement of first case along first case. The hydraulic device with the mechanical position pilot feedback has the advantages of high control precision and high response speed.

Description

Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a hydraulic device with mechanical position pilot feedback and a digital hydraulic cylinder.
Background
Along with the popularization of electronic information technology in the field of hydraulic transmission, the problems that a traditional hydraulic control system is sensitive to pollution, low in efficiency, easy to be interfered and the like are gradually highlighted, the digital hydraulic technology has strong advantages in the aspects of response speed, anti-interference performance, energy conservation, fault tolerance, universality and the like, particularly, the control form of a digital signal is simpler and more convenient and meets the requirements of information interfaces of computers, internet and the like, and the precision loss, time delay and cost improvement caused by A/D and D/A conversion can be reduced, so that once the digital hydraulic technology in the modern sense is put forward, the digital hydraulic technology obtains wide attention and is called as the future hydraulic technology.
The digital valve adopts a stepping motor or a servo motor controlled by digital signals as an electro-mechanical conversion element, and converts the rotation angle of the motor into the linear opening of the valve core by a screw rod structure, so that the digital valve has the advantages of high repeatability precision, no hysteresis loop, no need of D/A conversion, no need of a linear amplifier and the like, and is more favorable for realizing the digital control and the intelligent development of a hydraulic system.
In the related art, a sensor is generally adopted to detect the position of the valve core and perform position feedback, and the electro-hydraulic feedback is utilized to control the output of the proportional electromagnet on the valve core.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a hydraulic device with mechanical position pilot feedback, and the hydraulic device has the advantages of high control precision and high response speed.
The embodiment of the invention provides a digital hydraulic cylinder which has the advantages of high control precision and high response speed.
The hydraulic device with mechanical position pilot feedback of the embodiment of the invention comprises:
the pilot valve comprises a first valve body and a first valve core, wherein the first valve core is inserted on the first valve body and can move along the axis of the first valve core;
the hydraulic cylinder comprises a cylinder body and a piston rod, a first end of the piston rod is positioned in the cylinder body and can move along the extending direction of the cylinder body, a second end of the piston rod is positioned outside the cylinder body, and the pilot valve is connected with the hydraulic cylinder so as to drive the piston rod to move;
the first end of the transmission piece is connected with the first end of the first valve core, the second end of the transmission piece is connected with the first end of the piston rod, the pilot valve is used for driving the piston rod to move along the axial direction of the piston rod, and the piston rod moves to drive the first valve core to move along the axial direction of the first valve core.
According to the hydraulic device with the mechanical position pilot feedback, the first valve core can be mechanically connected with the piston rod through the transmission piece, so that after the piston rod acts, the displacement information of the piston rod can be transmitted to the first valve core in a mechanical feedback mode, and the control precision of the hydraulic device is improved.
In addition, the transmission piece can also be used for feeding back the mechanical feedback to the first valve core after the piston rod acts, so that the first valve core can respond in time, and the response speed of the hydraulic device with the mechanical position pilot feedback provided by the embodiment of the invention is improved.
Therefore, the hydraulic device with the mechanical position pilot feedback provided by the embodiment of the invention has the advantages of high control precision and high response speed.
In some embodiments, the first valve spool is movable between a first direction and a second direction to drive the piston rod to move between a third direction and a fourth direction, the first direction being opposite the second direction, the third direction being opposite the fourth direction.
In some embodiments, a first end of the transmission member is threadedly connected to the first valve core, and a second end of the transmission member is connected to the first end of the piston rod via a nut and screw assembly.
In some embodiments, the hydraulic apparatus further includes a control assembly and a driving assembly, the driving assembly includes a driving member, the driving member includes a driving portion, the driving portion is connected to the first valve element to drive the first valve element to move, the control assembly includes a controller, a first detecting member and a second detecting member, the controller is connected to the driving member, the first detecting member is connected between the driving member and the controller, the first detecting member is configured to detect a rotation angle of the driving member, the second detecting member is connected between the piston rod and the controller, and the second detecting member is configured to detect a movement distance of the piston rod.
In some embodiments, the drive assembly further comprises a coupling, a first end of the coupling is connected to the drive portion, and a second end of the coupling is connected to the first spool via a spline.
The digital hydraulic cylinder comprises a hydraulic device and a main valve, wherein the hydraulic device is the hydraulic device with mechanical position pilot feedback according to any one of the above embodiments, the main valve comprises a second valve body and a second valve core, the second valve core is inserted into the second valve body and is movable along the axial direction of the second valve core, a valve cavity of the pilot valve is connected with a cavity of the main valve, the pilot valve is used for driving the second valve core to move, the main valve is connected with the hydraulic cylinder, and the second valve core moves to drive the piston rod to move.
In some embodiments, the valve cavity of the pilot valve includes a first low-pressure cavity, a first high-pressure cavity, a second cavity and a second low-pressure cavity, which are sequentially communicated, the valve cavity of the main valve includes a third cavity, a third low-pressure cavity, a second high-pressure cavity, a fourth low-pressure cavity and a fourth cavity, which are sequentially communicated, the first cavity is communicated with the third cavity, the second cavity is communicated with the fourth cavity, the main valve has a high-pressure oil port and a low-pressure oil port, a first oil inlet and a second oil outlet, the first high-pressure cavity and the second high-pressure cavity are both communicated with the high-pressure oil port, the first low-pressure cavity to the fourth low-pressure cavity are both communicated with the low-pressure oil port, the high-pressure oil port is used for introducing high-pressure oil, the low-pressure oil port is used for introducing low-pressure oil, and the first oil inlet and outlet and the second oil inlet and outlet are both connected with the hydraulic cylinder.
In some embodiments, the first valve spool includes a first protrusion, a second protrusion, and a third protrusion, which are sequentially arranged, the first protrusion is configured to communicate and block the first low-pressure chamber and the first chamber, the second protrusion is configured to communicate and block the first high-pressure chamber and the first chamber and the second chamber, the third protrusion is configured to communicate and block the second chamber and the second low-pressure chamber, the second valve spool includes a fourth protrusion, a fifth protrusion, a sixth protrusion, and a seventh protrusion, which are sequentially arranged, the fourth protrusion is configured to communicate and block the third chamber and the third low-pressure chamber, the fifth protrusion is configured to communicate and block the first oil inlet/outlet and the third low-pressure chamber and the second high-pressure chamber, the sixth protrusion is configured to communicate and block the second oil inlet/outlet and the second high-pressure chamber and the fourth low-pressure chamber, and the seventh protrusion is configured to communicate and block the fourth low-pressure chamber and the fourth chamber.
In some embodiments, the digital hydraulic cylinder has a first state in which the first high pressure chamber is in communication with the first chamber and the high pressure oil flows into the third chamber and drives the second spool to move so that the third low pressure chamber is in communication with the first oil inlet and outlet and the first high pressure chamber is in communication with the second oil inlet and outlet;
in the second state, the first high-pressure cavity is communicated with the second cavity, the high-pressure oil flows into the second cavity and drives the second valve core to move, so that the fourth low-pressure cavity is communicated with the second oil inlet and outlet, and the second high-pressure cavity is communicated with the first oil inlet and outlet.
In some embodiments, the digital hydraulic cylinder according to the embodiments of the present invention further includes a first elastic member and a second elastic member, the main valve includes a first mounting portion and a second mounting portion, the first mounting portion and the second mounting portion are arranged opposite to each other in an axial direction of the second spool, the first mounting portion is adjacent to the fourth projecting portion and located on a side of the fourth projecting portion away from the second mounting portion, the second mounting portion is adjacent to the seventh projecting portion and located on a side of the seventh projecting portion away from the first mounting portion, the first elastic member is disposed between the first mounting portion and the fourth projecting portion, and the second elastic member is disposed between the second mounting portion and the seventh projecting portion.
Drawings
FIG. 1 is a digital hydraulic cylinder of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pilot valve and a main valve of a digital hydraulic cylinder according to an embodiment of the present invention.
Reference numerals:
a pilot valve 1; a first valve body 11; a first low pressure chamber 111; a first cavity 112; a first high pressure chamber 113; a second chamber 114; a second low pressure chamber 115; a first spool 12; the first projection 121; the second projecting portion 122; the third projecting portion 123;
a hydraulic cylinder 2; a cylinder 21; a piston rod 22;
a transmission member 3;
a drive assembly 4; a driving member 41; a drive section 42; a coupling 43;
a control component 5; a controller 51; the first detecting member 52; the second detecting member 53;
a main valve 6; a second valve body 61; a third chamber 611; a third low pressure chamber 612; a second high pressure chamber 613; a fourth low pressure chamber 614; a fourth cavity 615; a high pressure oil port 616; a low pressure oil port 617; a first oil inlet/outlet port 618; a second oil inlet/outlet port 619; a second spool 62; a fourth protrusion 621; a fifth projecting portion 622; the sixth protrusion 623; the seventh projecting portion 624; a first mounting portion 63; a second mounting portion 64;
the first elastic member 71; and a second elastic member 72.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A hydraulic device with mechanical position pilot feedback according to an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1 and 2, a hydraulic apparatus with a mechanical position pilot feedback according to an embodiment of the present invention includes: a pilot valve 1, a hydraulic cylinder 2 and a transmission 3.
The pilot valve 1 comprises a first valve body 11 and a first valve core 12, wherein the first valve core 12 is inserted into the first valve body 11, and the first valve core 12 is movable along the axis of the first valve core 12. The hydraulic cylinder 2 comprises a cylinder body 21 and a piston rod 22, a first end of the piston rod 22 is positioned in the cylinder body 21 and can move along the extending direction of the cylinder body 21, a second end of the piston rod 22 is positioned outside the cylinder body 21, and the pilot valve 1 is connected with the hydraulic cylinder 2 to drive the piston rod 22 to move. The first end of the transmission member 3 is connected with the first end of the first valve core 12, the second end of the transmission member 3 is connected with the first end of the piston rod 22, the pilot valve 1 is used for driving the piston rod 22 to move along the axial direction of the piston rod 22, and the piston rod 22 moves to drive the first valve core 12 to move along the axial direction of the first valve core 12.
Specifically, as shown in fig. 1 and 2, the first valve chamber and the first valve body 12 extend in the same direction (i.e., in the same left-right direction in fig. 1), the first valve body 12 is movable in the left-right direction, and the cylinder body 21 of the hydraulic cylinder 2 extends in the same direction as the piston rod 22 (i.e., in the same direction as the left-right direction in fig. 1). The right end of the first valve core 12 is the first end of the first valve core 12, the left end of the transmission member 3 is the first end of the transmission member 3, the right end of the transmission member 3 is the second end of the transmission member 3, and the left end of the piston rod 22 is the first end of the piston rod 22.
It will be appreciated that as shown in fig. 1 and 2, both the left end and the right end of the first valve spool 12 are disposed outside the pilot valve 1, i.e. the left end of the first valve spool 12 may be connected to a driving device, such as a motor, etc., to drive the first valve spool 12 to move, and the right end of the first valve spool 12 is connected to the left end of the transmission member 3.
In some embodiments, a first end of the transmission member 3 is threadedly connected to the first valve spool 12, and a second end of the transmission member 3 is connected to a first end of the piston rod 22 via a nut and screw assembly.
It can be understood that the first valve core 12 can be driven by the driving device to rotate the first valve core 12, and since the right end of the first valve core 12 is connected to the first transmission member 3 by a screw thread, the first valve core 12 moves while rotating, so as to open and close the pilot valve 1, so as to drive the piston rod 22 to move by hydraulic transmission.
The piston rod 22 moves, and the piston rod 22 is connected with the transmission piece 3 through the nut-screw pair, so that the movement of the piston rod 22 can drive the transmission piece 3 to rotate, the left end of the transmission piece 3 is connected with the first valve core 12 through threads, the first valve core 12 can move by utilizing the rotation of the transmission piece 3, and then the displacement information of the piston rod 22 is transmitted to the first valve core 12 by utilizing a mechanical feedback mode, so that the control precision of the hydraulic device is improved.
That is, in the hydraulic apparatus having the mechanical position pilot feedback according to the embodiment of the present invention, the first spool 12 and the piston rod 22 can be mechanically connected by the actuator 3, so that after the piston rod 22 is operated, the displacement information of the piston rod 22 can be transmitted to the first spool 12 by the mechanical feedback, thereby improving the control accuracy of the hydraulic apparatus.
In addition, the transmission member 3 can also be used for mechanically feeding back the first valve core 12 after the piston rod 22 is operated, so that the first valve core 12 can respond in time, and the response speed of the hydraulic device with mechanical position pilot feedback provided by the embodiment of the invention is improved.
In some embodiments, the first spool 12 is movable between a first direction and a second direction to drive the piston rod 22 to move between a third direction and a fourth direction, the first direction being opposite the second direction, the third direction being opposite the fourth direction.
It will be appreciated that, as shown in fig. 1 and 2, pointing from left to right is a first direction and a third direction, and pointing from right to left is a second direction and a fourth direction. It should be noted that, for example, the first valve core 12 moves in the first direction, so that the pilot valve 1 is opened, and the piston rod 22 is driven by the hydraulic pressure difference to move in the third direction, and the piston rod 22 moves to drive the first valve core 12 to move in the second direction through the transmission member 3, thereby implementing mechanical feedback on the first valve core 12.
In some embodiments, the hydraulic apparatus further includes a control assembly 5 and a driving assembly 4, the driving assembly 4 includes a driving member 41, the driving member 41 includes a driving portion 42, the driving portion 42 is connected to the first valve spool 12 to drive the first valve spool 12 to move, the control assembly 5 includes a controller 51, a first detecting member 52 and a second detecting member 53, the controller 51 is connected to the driving member 41, the first detecting member 52 is connected between the transmission member 3 and the controller 51, the first detecting member 52 is used for detecting a rotation angle of the transmission member 3, the second detecting member 53 is connected between the piston rod 22 and the controller 51, and the second detecting member 53 is used for detecting a moving distance of the piston rod 22.
Specifically, as shown in fig. 1 and 2, the driving member 41 may be a motor, and the driving portion 42 is an output shaft of the motor, so that the driving portion 42 may be connected to the first valve core 12 through a coupling 43. Therefore, after the driving member 41 is started, the function of driving the first valve core 12 to rotate can be realized, and the first valve core 12 moves in the left-right direction while rotating through the connection between the first valve core 12 and the transmission member 3.
It will be appreciated that the first sensing member 52 may be an encoder to sense the angle of rotation of the driving member 3, and to supply the sensed data to the controller 51 to control the output of the driving member 41. The second detection member 53 may be a displacement sensor for detecting the displacement amount of the piston rod 22.
It should be noted that, the driving member 41 is started, and the piston rod 22 is driven to move by the pilot valve 1 and the like, so that the displacement of the piston rod 22 can be detected in real time by the second detecting member 53, and meanwhile, the piston rod 22 moves to drive the transmission member 3 to rotate, so that the movement of the piston rod 22 can be mechanically fed back to the first valve core 12. In addition, the first detecting member 52 may detect the rotation amount of the driving member 3 in real time to transmit the detected information to the controller 51.
That is, the actuation of the actuator 41 may move the first valve spool 12 from the initial position in the first direction or the second direction, and the movement of the piston rod 22 may move the first valve spool 12 from the moved position to the initial position via the transmission member 3, so that the response speed of the pilot valve 1 in subsequent use is faster. In addition, the moving amount of the piston rod 22 and the rotating amount of the transmission member 3 are respectively transmitted to the controller 51 through the second detection member 53 and the first detection member 52, so that the piston rod 22 is corrected by using feedback information before being moved to the preset position, so that the moving accuracy of the piston rod 22 is more accurate.
In some embodiments, the drive assembly 4 further comprises a coupler 43, a first end of the coupler 43 is connected to the drive portion 42, and a second end of the coupler 43 is splined to the first spool 12.
It will be appreciated that the second end of the coupling 43 is splined to the first valve spool 12 such that the first valve spool 12 can rotate along the axis of the first valve spool 12 and also move in a side-to-side direction.
The digital hydraulic cylinder 2 of the embodiment of the invention comprises a hydraulic device and a main valve 6, the hydraulic device is a hydraulic device with mechanical position pilot feedback according to any one of the above embodiments, the main valve 6 comprises a second valve body 61 and a second valve core 62, the second valve core 62 is inserted into the second valve body 61, the second valve core 62 is movable along the axial direction of the second valve core 62, a valve cavity of the pilot valve 1 is connected with a cavity of the main valve 6, the pilot valve 1 is used for driving the second valve core 62 to move, the main valve 6 is connected with the hydraulic cylinder 2, and the second valve core 62 moves to drive the piston rod 22 to move.
Specifically, as shown in fig. 1 and 2, the second valve spool 62 is movable in the left-right direction, and the valve chamber of the pilot valve 1 is connected to the valve chamber of the main valve 6, so that the external oil flows into the valve chamber of the main valve 6 through the valve chamber of the pilot valve 1.
It can be understood that, the valve chamber of the pilot valve 1 can be filled with high-pressure liquid and low-pressure liquid, after the first valve core 12 moves, the high-pressure liquid and the low-pressure liquid respectively flow into the valve chamber of the main valve 6, and different pressures are formed at the left and right sides of the second valve core 62, so that the second valve core 62 is driven to move by using the pressure difference, so as to realize the movement of the driving piston rod 22.
It should be noted that the pressure of the high-pressure liquid is greater than 16Mpa, and the pressure of the low-pressure liquid is less than 8Mpa.
In some embodiments, as shown in fig. 1 and 2, the valve chamber of the pilot valve 1 includes a first low pressure chamber 111, a first chamber 112, a first high pressure chamber 113, a second chamber 114, and a second low pressure chamber 115, which are sequentially communicated from left to right, the valve chamber of the main valve 6 includes a third chamber 611, a third low pressure chamber 612, a second high pressure chamber 613, a fourth low pressure chamber 614, and a fourth chamber 615, which are sequentially communicated from left to right, the first chamber 112 is communicated with the third chamber 611, and the second chamber 114 is communicated with the fourth chamber 615.
As shown in fig. 1 and 2, the main valve 6 has a high-pressure oil port 616, a low-pressure oil port 617, a first oil inlet/outlet port 618 and a second oil inlet/outlet port 619, the first high-pressure chamber 113 and the second high-pressure chamber 613 are both communicated with the high-pressure oil port 616, the first low-pressure chamber 111 to the fourth low-pressure chamber 614 are both communicated with the low-pressure oil port 617, the high-pressure oil port 616 is used for introducing high-pressure oil, the low-pressure oil port 617 is used for introducing low-pressure oil, and the first oil inlet/outlet port 618 and the second oil inlet/outlet port 619 are both connected to the hydraulic cylinder 2, so that the piston rod 22 can be driven to move in the left-right direction when the first oil inlet/outlet port 618 and the second oil inlet/outlet port 619 discharge liquid with different pressures.
In some embodiments, as shown in fig. 1 and 2, the first spool 12 includes a first protrusion 121, a second protrusion 122, and a third protrusion 123 arranged in sequence, the first protrusion 121 is used to communicate and block the first low pressure chamber 111 and the first chamber 112, the second protrusion 122 is used to communicate and block the first high pressure chamber 113 with the first chamber 112 and the second chamber 114, the third protrusion 123 is used to communicate and block the second chamber 114 and the second low pressure chamber 115, the second spool 62 includes a fourth protrusion 621, a fifth protrusion 622, a sixth protrusion 623, and a seventh protrusion 624 arranged in sequence, the fourth protrusion 621 is used to communicate and block the third chamber 611 and the third low pressure chamber 612, the fifth protrusion 622 is used to communicate and block the first inlet/outlet port 618 with the third low pressure chamber 612 and the second high pressure chamber 613, the sixth protrusion 623 is used to communicate and block the second inlet/outlet port 619 with the second high pressure chamber 619 and the fourth low pressure chamber 613, and the seventh protrusion 623 is used to block the fourth low pressure chamber 615 and the fourth low pressure chamber 624.
It can be understood that, for example, when the first spool 12 moves from left to right, the first chamber 112 communicates with the first high-pressure chamber 113, the second chamber 114 communicates with the second low-pressure chamber 115, the high-pressure liquid in the first high-pressure chamber 113 flows into the third chamber 611 through the first chamber 112, the low-pressure liquid in the second low-pressure chamber 115 flows into the fourth chamber 615 through the second chamber 114, and the hydraulic pressure acting on the discothey boss is subjected to the pressure acting on the seventh boss due to the difference in the hydraulic pressure, so that the second spool 62 moves from left to right, the third low pressure communicates with the first inlet/outlet port 618, the second high-pressure chamber 613 communicates with the second inlet/outlet port 619, the low-pressure liquid in the third low-pressure chamber 612 can be discharged through the first inlet/outlet port 618, and the high-pressure liquid in the second high-pressure chamber 613 can be discharged through the second inlet/outlet port 619, so that the piston rod 22 moves from right to left.
In some embodiments, the digital hydraulic cylinder 2 has a first state in which the first high pressure chamber 113 is in communication with the first chamber 112 and high pressure oil flows into the third chamber 611 and drives the second spool 62 to move so that the third low pressure chamber 612 is in communication with the first port 618 and the first high pressure chamber 113 is in communication with the second port 619. In the second state, the first high-pressure chamber 113 communicates with the second chamber 114, and the high-pressure oil flows into the second chamber 114 and drives the second spool 62 to move, so that the fourth low-pressure chamber 614 communicates with the second oil inlet/outlet 619, and the second high-pressure chamber 613 communicates with the first oil inlet/outlet 618.
It is understood that movement of the first spool 12 from left to right is the first state and movement of the first spool 12 from right to left is the second state.
In some embodiments, the digital hydraulic cylinder 2 of the embodiment of the present invention further includes a first elastic member 71 and a second elastic member 72, the main valve 6 includes a first mounting portion 63 and a second mounting portion 64, the first mounting portion 63 and the second mounting portion 64 are arranged opposite to each other in the axial direction of the second spool 62, the first mounting portion 63 is adjacent to the fourth projecting portion 621 and is located on a side of the fourth projecting portion 621 away from the second mounting portion 64, the second mounting portion 64 is adjacent to the seventh projecting portion 624 and is located on a side of the seventh projecting portion 624 away from the first mounting portion 63, the first elastic member 71 is provided between the first mounting portion 63 and the fourth projecting portion 621, and the second elastic member 72 is provided between the second mounting portion 64 and the seventh projecting portion 624.
Specifically, as shown in fig. 1 and 2, the first mounting portion 63 is located on the left side of the second valve chamber, and the second mounting portion 64 is displaced on the right side of the second valve chamber. Alternatively, the first elastic member 71 and the second elastic member 72 are both springs, but the first elastic member 71 and the second elastic member 72 may be a member having an elastic function such as rubber.
It is understood that, in the digital hydraulic cylinder 2 of the embodiment of the present invention, the first elastic member 71 and the second elastic member 72 are not subjected to a force in the initial state. When the second spool 62 moves due to the hydraulic pressure difference, so that one of the first elastic member 71 and the second elastic member 72 is under tension and the other one is under compression, the second spool 62 is easily restored to the initial state (i.e., the equilibrium state) by the elastic force of the first elastic member 71 and the second elastic member 72 after the hydraulic pressure difference applied to the second spool 62 is cancelled.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A hydraulic device having mechanical position pilot feedback, comprising:
the pilot valve comprises a first valve body and a first valve core, wherein the first valve core is inserted on the first valve body and can move along the axis of the first valve core;
the hydraulic cylinder comprises a cylinder body and a piston rod, a first end of the piston rod is positioned in the cylinder body and can move along the extending direction of the cylinder body, a second end of the piston rod is positioned outside the cylinder body, and the pilot valve is connected with the hydraulic cylinder so as to drive the piston rod to move;
the first end of the transmission piece is connected with the first end of the first valve core, the second end of the transmission piece is connected with the first end of the piston rod, the pilot valve is used for driving the piston rod to move along the axial direction of the piston rod, and the piston rod moves to drive the first valve core to move along the axial direction of the first valve core.
2. The hydraulic apparatus of claim 1, wherein the first spool is movable between a first direction and a second direction to drive the piston rod to move between a third direction and a fourth direction, the first direction being opposite the second direction, the third direction being opposite the fourth direction.
3. The hydraulic apparatus with mechanical position pilot feedback according to claim 2, wherein a first end of the transmission member is threadedly connected to the first spool, and a second end of the transmission member is connected to the first end of the piston rod via a nut-and-screw assembly.
4. The hydraulic device with mechanical position pilot feedback according to claim 3, further comprising a control assembly and a drive assembly, the drive assembly including a drive portion connected to the first spool to drive the first spool to move,
the control assembly comprises a controller, a first detection piece and a second detection piece, the controller is connected with the driving piece, the first detection piece is connected between the driving piece and the controller, the first detection piece is used for detecting the rotation angle of the driving piece, the second detection piece is connected between the piston rod and the controller, and the second detection piece is used for detecting the movement distance of the piston rod.
5. The hydraulic device of claim 4, wherein the drive assembly further comprises a coupler, a first end of the coupler is connected to the drive portion, and a second end of the coupler is splined to the first spool.
6. A digital hydraulic cylinder, comprising a hydraulic device and a main valve, wherein the hydraulic device is the hydraulic device with mechanical position pilot feedback according to any one of claims 1 to 5, the main valve comprises a second valve body and a second valve core, the second valve core is inserted on the second valve body, the second valve core is movable along the axial direction of the second valve core, a valve cavity of the pilot valve is connected with a cavity of the main valve, the pilot valve is used for driving the second valve core to move, the main valve is connected with the hydraulic cylinder, and the second valve core moves to drive the piston rod to move.
7. The digital hydraulic cylinder as claimed in claim 6, wherein the valve chamber of the pilot valve comprises a first low pressure chamber, a first high pressure chamber, a second chamber and a second low pressure chamber which are sequentially communicated, the valve chamber of the main valve comprises a third chamber, a third low pressure chamber, a second high pressure chamber, a fourth low pressure chamber and a fourth chamber which are sequentially communicated, the first chamber is communicated with the third chamber, the second chamber is communicated with the fourth chamber,
the main valve has high-pressure oil port, low pressure oil port, and the oil outlet is advanced to first business turn over hydraulic fluid port and second, first high-pressure chamber with the second high-pressure chamber all with high-pressure oil port intercommunication, first low-pressure chamber extremely fourth low-pressure chamber all with low pressure hydraulic fluid port intercommunication, high pressure hydraulic fluid port is used for letting in high-pressure fluid, the low pressure hydraulic fluid port is used for letting in low-pressure fluid, first business turn over hydraulic fluid port with the second business turn over hydraulic fluid port all with the pneumatic cylinder links to each other.
8. The digital hydraulic cylinder according to claim 7, wherein the first spool includes a first projection for communicating and blocking the first low-pressure chamber and the first chamber, a second projection for communicating and blocking the first high-pressure chamber and the first chamber and the second chamber, and a third projection for communicating and blocking the second chamber and the second low-pressure chamber, which are arranged in this order,
the second valve core comprises a fourth protruding part, a fifth protruding part, a sixth protruding part and a seventh protruding part which are sequentially arranged, the fourth protruding part is used for conducting and blocking the third cavity and the third low-pressure cavity, the fifth protruding part is used for conducting and blocking the first oil inlet and outlet, the third low-pressure cavity and the second high-pressure cavity, the sixth protruding part is used for conducting and blocking the second oil inlet and outlet, the second high-pressure cavity and the fourth low-pressure cavity, and the seventh protruding part is used for conducting and blocking the fourth low-pressure cavity and the fourth cavity.
9. The digital hydraulic cylinder of claim 8, wherein the digital hydraulic cylinder has a first state in which the first high pressure chamber is in communication with the first chamber and the high pressure oil flows into the third chamber and drives the second spool to move such that the third low pressure chamber is in communication with the first port and the first high pressure chamber is in communication with the second port;
in the second state, the first high-pressure cavity is communicated with the second cavity, the high-pressure oil flows into the second cavity and drives the second valve core to move, so that the fourth low-pressure cavity is communicated with the second oil inlet and outlet, and the second high-pressure cavity is communicated with the first oil inlet and outlet.
10. The digital hydraulic cylinder according to claim 8, further comprising a first elastic member and a second elastic member, wherein the main valve includes a first mounting portion and a second mounting portion, the first mounting portion and the second mounting portion are arranged in a manner of being opposed to each other in an axial direction of the second spool, the first mounting portion is adjacent to the fourth projecting portion and is located on a side where the fourth projecting portion is away from the second mounting portion, the second mounting portion is adjacent to the seventh projecting portion and is located on a side where the seventh projecting portion is away from the first mounting portion, the first elastic member is disposed between the first mounting portion and the fourth projecting portion, and the second elastic member is disposed between the second mounting portion and the seventh projecting portion.
CN202211336824.7A 2022-10-28 2022-10-28 Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback Pending CN115507086A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211336824.7A CN115507086A (en) 2022-10-28 2022-10-28 Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211336824.7A CN115507086A (en) 2022-10-28 2022-10-28 Hydraulic device and digital hydraulic cylinder with mechanical position pilot feedback

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CN115507086A true CN115507086A (en) 2022-12-23

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