CN111927843A - Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof - Google Patents

Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof Download PDF

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Publication number
CN111927843A
CN111927843A CN202010686708.2A CN202010686708A CN111927843A CN 111927843 A CN111927843 A CN 111927843A CN 202010686708 A CN202010686708 A CN 202010686708A CN 111927843 A CN111927843 A CN 111927843A
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China
Prior art keywords
port
valve
load
switch valve
oil
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CN202010686708.2A
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Chinese (zh)
Inventor
钟麒
帅琨
王军
何贤剑
谢耿
李研彪
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Priority to CN202010686708.2A priority Critical patent/CN111927843A/en
Publication of CN111927843A publication Critical patent/CN111927843A/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • 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
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0603—Multiple-way valves

Abstract

The invention discloses a hydraulic valve unit for composite control of digital fluid and continuous fluid and a control method thereof. The hydraulic valve unit comprises a three-position four-way proportional valve and four two-position two-way high-speed switch valves; wherein four of the switch valves are all arranged in the proportional valve; the oil circuit in the proportional valve can flow back in the modes of an oil inlet, a port P, a port A (A), (B), a load, a port B (A), a port T and an oil tank; the oil circuit can also be reflowed through a high-speed switch valve. According to the invention, through the design of the two oil ways, the control process can be controlled in stages, the proportional valve and the high-speed switch valve can be matched for use in the idle stroke, the output flow is maximized, the load is controlled to move quickly, and a large amount of time can be saved. When the load is close to the target position, the proportional valve can be closed independently, only the high-speed switch valve is opened, the output flow is reduced, and the accurate control of the load is realized. The scheme can work under various conditions, and makes up the defect of large limitation under the control of a single hydraulic valve.

Description

Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof
Technical Field
The invention belongs to the field of hydraulic valve control, and particularly relates to a hydraulic valve unit for composite control of digital fluid and continuous fluid and a control method thereof.
Background
The hydraulic valve is a key control element of a hydraulic system, and the hydraulic valve represented by a proportional valve is widely applied to various hydraulic systems at present, because the volume of oil output by the proportional valve is large, the response of a controlled load is fast, and the movement speed is fast, however, the flow pulsation output by the proportional valve is also larger, the oil cavity connected with the proportional valve is also easier to generate pressure pulse, and the controlled load is easy to shake, so that the control precision is reduced; the high-speed switch valve outputs small oil volume, the controlled load has slow response and slow movement speed, but the flow pulsation output by the high-speed switch valve is smaller, the oil cavity connected with the high-speed switch valve is less prone to generating pressure pulse, and the controlled load is not prone to shaking, so that although the control precision of the high-speed switch valve is improved, the movement speed of the controlled load is reduced, and the dynamic characteristic of the high-speed switch valve is also affected. Therefore, the combination of the large-flow proportional valve and the small-flow high-speed switch valve can be suitable for quick motion control, high dynamic response of a controlled object and high-precision control.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a hydraulic valve unit for composite control of digital fluid and continuous fluid and a control method thereof.
The invention discloses a hydraulic valve unit for composite control of digital fluid and continuous fluid, which comprises a three-position four-way proportional valve and four two-position two-way high-speed switch valves; wherein four said switch valves all install inside said proportional valve: a, B, P, T four ports are arranged on the proportional valve block, wherein the port P and the port T are arranged on the side surface of the valve block, and the port A and the port B are arranged on the bottom surface of the valve block; an A, B port of the proportional valve is connected with two ends of a load, a P port is an oil inlet, a T port is connected with an oil tank, and the P port can be directly communicated with the A port or the B port through an internal oil path; meanwhile, the T port can be directly communicated with the port B or the port A through an internal oil circuit;
the port A of the proportional valve is communicated with an oil inlet of the first switch valve and an oil outlet of the second switch valve through an oil path branch arranged in the valve block, and the port B of the proportional valve is communicated with an oil inlet of the fourth switch valve and an oil outlet of the third switch valve through an oil path branch arranged in the valve block; the port P of the proportional valve is communicated with an oil inlet of the second switch valve and an oil inlet of the third switch valve respectively through an oil path branch arranged in the valve block, and the port T of the proportional valve is communicated with an oil outlet of the first switch valve and an oil outlet of the fourth switch valve respectively through an oil path branch arranged in the valve block.
As one scheme of the invention, the valve port size of the proportional valve is larger than that of the switch valve. The user can set the size relationship of the two valves according to the requirements of the conditions, for example, the size of the valve port of the proportional valve is two times or more than that of the switch valve.
As another scheme of the invention, the valve port size of the proportional valve is smaller than that of the switch valve. The user can set the two size relations according to the requirement of the situation, for example, the size of the valve port of the switch valve is two times or more than that of the proportional valve.
As another scheme of the invention, the top surface of the proportional valve block is provided with four switch valve mounting holes, four two-position two-way high-speed switch valves are all mounted in the switch valve mounting holes, and an oil inlet and an oil outlet of each switch valve are communicated with corresponding oil ports of the proportional valve through an oil way branch arranged in the valve block.
The control unit aims at the valve port size of the proportional valve to be larger than that of the switch valve. The invention also discloses a control method, which comprises the following steps: the load is connected with the port A and the port B of the proportional valve, and the movement of oil inlet from the port A and oil outlet from the port B is needed to be realized by setting the load; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve; the oil way is communicated through a port P, a port A, a load, a port B and a port T; at the moment, the load moves rapidly, but the control precision is lower;
when the load reaches the target position quickly, the proportional valve is closed through the movement of the proportional valve spool, namely the port P and the port A of the proportional valve are blocked, and the port B and the port T of the proportional valve are blocked; at the moment, a second switch valve and a fourth switch valve are opened, the first switch valve and the third switch valve are kept closed, oil inlets and oil outlets of the second switch valve and the fourth switch valve are communicated, and an oil way is communicated through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T; at the moment, the load moves at a lower speed, but the accurate control is high, so that the load is accurately stopped at the target position. In the same way, the load needs to realize a control method for the movement of oil inlet from the port B and oil outlet from the port A.
Furthermore, at the initial moment when the load starts to move, the high-speed switch valve also participates in the work while the proportional valve works;
if the load needs to realize the movement of oil inlet from the port A and oil outlet from the port B, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve at the initial moment when the load starts to move; simultaneously opening a second switch valve and a fourth switch valve, closing the first switch valve and the third switch valve, and conducting an oil path through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T;
if the load needs to realize the movement of oil inlet from the port B and oil outlet from the port A, at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port B and the port A through the movement of the valve core of the proportional valve, the first switch valve and the third switch valve are opened simultaneously, the second switch valve and the fourth switch valve are closed, and the oil way is also communicated through the port P, the third switch valve, the port B, the load, the port A, the first switch valve and the port T.
The control unit aims at the valve port size of the proportional valve to be smaller than that of the switch valve. The invention also discloses a control method, which comprises the following steps: the load is connected with the port A and the port B of the proportional valve, and the movement of oil inlet from the port A and oil outlet from the port B is needed to be realized by setting the load; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve; the oil way is communicated through a port P, a port A, a load, a port B and a port T; simultaneously opening a second switch valve and a fourth switch valve, closing the first switch valve and the third switch valve, and conducting an oil path through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T; when the load is fast enough to reach the target position; all the switch valves are closed, and the oil path is conducted only through the port P, the port A, the load, the port B and the port T of the proportional valve, namely, the proportional valve is only adopted for precise control. In the same way, the load needs to realize a control method for the movement of oil inlet from the port B and oil outlet from the port A.
Compared with the prior art, the invention has the advantages that:
(1) the invention can realize staged control, can use the proportional valve and the high-speed switch valve in a matching way during idle stroke, achieves the maximization of output flow, controls the quick movement of the load and can save a large amount of time.
(2) When the load is close to the target position, the proportional valve can be closed independently, only the high-speed switch valve is opened, the output flow is reduced, and the accurate control of the load is realized. The scheme can work under various conditions, and makes up the defect of large limitation under the control of a single hydraulic valve.
(3) This scheme is structurally, and high-speed ooff valve adopts embedded installation, compares with traditional structure and has saved a large amount of material cost and the appearance is compacter exquisite.
Drawings
FIG. 1 is a hydraulic schematic of the hydraulic valve unit of the present invention;
FIG. 2 is an external schematic view of the hydraulic valve unit of the present invention;
FIG. 3 is a schematic view of an oil inlet of the hydraulic valve unit of the present invention;
FIG. 4 is a schematic diagram of the working oil port of the hydraulic valve unit of the present invention
FIG. 5 is a schematic cross-sectional view of a hydraulic valve unit of the present invention;
FIG. 6 is a schematic top view of the oil circuit of the hydraulic valve unit of the present invention;
fig. 7 is a schematic sectional view of the high-speed switching valve of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1-7, the invention discloses a hydraulic valve unit for digital fluid and continuous fluid compound control, which comprises a three-position four-way proportional valve and four two-position two-way high-speed switch valves; the four switch valves are all arranged in the proportional valve, A, B, P, T four ports are arranged on the proportional valve block, wherein the P port and the T port are arranged on the side surface of the valve block, and the A port and the B port are arranged on the bottom surface of the valve block; the oil circuit can directly flow back in the proportional valve without passing through a high-speed switch valve, namely the oil circuit can flow back in a mode of an oil inlet, a port P, a port A (B), a load, a port B (A), a port T and an oil tank.
An opening A of the proportional valve is communicated with an oil inlet of a first switch valve 3-1 and an oil outlet of a second switch valve 3-2 through an oil path branch arranged in a valve block, and an opening B of the proportional valve is communicated with an oil inlet of a fourth switch valve 3-4 and an oil outlet of a third switch valve 3-3 through an oil path branch arranged in the valve block; the port P of the proportional valve is communicated with an oil inlet of a second switch valve 3-2 and an oil inlet of a third switch valve 3-3 through oil path branches arranged in the valve block, and the port T of the proportional valve is communicated with an oil outlet of a first switch valve 3-1 and an oil outlet of a fourth switch valve 3-4 through oil path branches arranged in the valve block. The oil path of this embodiment may also flow back through the high-speed switch valve, that is, the oil path may flow back in the manner of an oil inlet, a port P, a second switch valve (third switch valve), a port a (b), a load, a port b (a), a fourth switch valve (first switch valve), a port T, and an oil tank.
As shown in fig. 5, which is a schematic structural diagram of a three-position four-way proportional valve in an embodiment of the present invention, except for a proportional valve block 1 and a PTAB port and an oil passage formed in the valve block, main components of the proportional valve include a valve core 4 and two left and right electromagnet assemblies, each electromagnet assembly 2 mainly includes a gasket 5, a return spring 6, an electromagnet 7, a coil 8, and a magnetism isolating ring 9, the gasket 5 plays a role in buffering the impact force of the electromagnet, the return spring 6 is used for resetting the electromagnet, the coil is used for driving the electromagnet 6, and the magnetism isolating ring 9 plays a role in isolating magnetism. The three-position four-way proportional valve of the embodiment is the same as the three-position four-way proportional valve in the prior art in terms of a valve core, an oil way and an electromagnet assembly except for four high-speed switch valves and an oil way branch which is provided with a matched high-speed switch valve; the left and right electromagnet assemblies can push the valve core 4 to move, so that the proportional valve is closed or in different working modes, and when the valve core moves to a specific position, the port P can be directly communicated with the port A or the port B through an internal oil way; meanwhile, the T port can be directly communicated with the port B or the port A through an internal oil path, namely the oil path can return without passing through a high-speed switch valve in the modes of an oil inlet, the port P, the port A (B), a load, the port B (A), the port T and an oil tank.
As shown in fig. 7, which is a schematic structural diagram of the two-position two-way high-speed switch valve of the present invention, the high-speed switch valve of the present embodiment may be a high-speed switch valve in the prior art, which is disposed on a valve block of a proportional valve and sealed by an end cap 14, and the main components of the high-speed switch valve include a push rod 11 and a small coil 10 for driving the push rod; the beads 12 are arranged in the guard ring 13 to determine the closing of the switch valve, and the push rod 11 can push the beads 12 to close the switch valve. The oil outlet and the oil inlet of the two-position two-way high-speed switch valve are connected with the corresponding oil ports of the proportional valve through oil way branches.
FIG. 6 is a schematic diagram of the top-view oil circuit of the hydraulic valve unit of the present invention; the oil outlet and the oil inlet of the high-speed switch valve are connected with the corresponding oil ports of the proportional valve through oil way branches.
As one scheme of the invention, the valve port size of the proportional valve is larger than that of the switch valve. Referring to fig. 1, when a load is required to move from a direction A to a direction B, a large-flow proportional valve is opened firstly, a large electromagnet close to the end B is electrified, so that a valve core moves towards the end A, a port P of the proportional valve is communicated with a port A, a port B is communicated with a port T, and an oil way passes through the port P, the port A, the load, the port B and the port T. At the moment, the load moves at a high speed (moves from A to B), but the control precision is low, when the load reaches a target position quickly, the large-flow proportional valve is closed, the valve core blocks the port P and the port A of the proportional valve, the port B and the port T are blocked, only the small-flow high-speed switch valve is opened, the small electromagnets of the second switch valve and the fourth switch valve are electrified, the ejector rod pushes away the beads, the through hole cannot be blocked, the oil inlet and the oil outlet of the switch valve are communicated, and the oil path passes through the port P, the second switch valve, the port A, the load, the port B, the fourth switch valve and the port T. At the moment, the load has low motion speed, but can be accurately controlled, so that the load is accurately stopped at the target position. The same applies when the load is required to move from direction B to direction a.
In the above scheme, it may be considered that the valve flow is further increased at the initial time when the load starts to move, and in the specific scheme, the high-speed switching valve is also made to participate in the operation while the proportional valve operates at the initial time when the load starts to move;
if the load needs to realize the movement of oil inlet from the port A and oil outlet from the port B, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve at the initial moment when the load starts to move; simultaneously opening a second switch valve and a fourth switch valve, closing the first switch valve and the third switch valve, and conducting an oil path through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T;
if the load needs to realize the movement of oil inlet from the port B and oil outlet from the port A, at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port B and the port A through the movement of the valve core of the proportional valve, the first switch valve and the third switch valve are opened simultaneously, the second switch valve and the fourth switch valve are closed, and the oil way is also communicated through the port P, the third switch valve, the port B, the load, the port A, the first switch valve and the port T.
As another scheme of the invention, the valve port size of the proportional valve is smaller than that of the switch valve. Referring to fig. 1, a high-speed on-off valve with a large flow rate is engaged with a proportional valve with a small flow rate. Because the high-speed switch valve has good dynamic response, and the pilot proportional valve has a dead zone and slow response, a high-speed switch valve bridge circuit is adopted in the initial stage of load motion to enable the load to respond to an instruction quickly, and meanwhile, the proportional valve also moves to cross the dead zone to participate in the control of the load motion. The two control effects are superposed to further accelerate the load movement, when the load is close to the target position immediately, the high-speed switch valve bridge circuit is closed, and only the proportional valve is reserved for control. Because the opening and closing of the high-speed switch valve easily generates flow fluctuation and influences the accurate positioning of the load, only the proportional valve is adopted for accurate control in the later period.
The specific scheme is as follows: the load is connected with the port A and the port B of the proportional valve, and the movement of oil inlet from the port A and oil outlet from the port B is needed to be realized by setting the load; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve; the oil way is communicated through a port P, a port A, a load, a port B and a port T; simultaneously opening a second switch valve and a fourth switch valve, closing the first switch valve and the third switch valve, and conducting an oil path through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T; when the load is fast enough to reach the target position; all the switch valves are closed, and the oil path is conducted only through the port P, the port A, the load, the port B and the port T of the proportional valve, namely, the proportional valve is only adopted for precise control. In the same way, the load needs to realize a control method for the movement of oil inlet from the port B and oil outlet from the port A.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A hydraulic valve unit for composite control of digital fluid and continuous fluid is characterized by comprising a three-position four-way proportional valve and four two-position two-way high-speed switch valves; wherein four of the switch valves are all installed in the proportional valve: a, B, P, T four ports are arranged on the proportional valve block, wherein the port P and the port T are arranged on the side surface of the valve block, and the port A and the port B are arranged on the bottom surface of the valve block; wherein the port P can be directly communicated with the port A or the port B through an internal oil circuit; meanwhile, the T port can be directly communicated with the port B or the port A through an internal oil circuit;
the port A of the proportional valve is communicated with an oil inlet of the first switch valve and an oil outlet of the second switch valve through an oil path branch arranged in the valve block, and the port B of the proportional valve is communicated with an oil inlet of the fourth switch valve and an oil outlet of the third switch valve through an oil path branch arranged in the valve block; the port P of the proportional valve is communicated with an oil inlet of the second switch valve and an oil inlet of the third switch valve respectively through an oil path branch arranged in the valve block, and the port T of the proportional valve is communicated with an oil outlet of the first switch valve and an oil outlet of the fourth switch valve respectively through an oil path branch arranged in the valve block.
2. The hydraulic valve unit for complex control of digital fluid and continuous fluid according to claim 1, wherein the valve port size of the proportional valve is larger than that of the on-off valve.
3. The hydraulic valve unit for complex control of digital fluid and continuous fluid according to claim 1, wherein the valve port size of the proportional valve is smaller than that of the on-off valve.
4. The hydraulic valve unit for compound control of digital fluid and continuous fluid according to claim 1, wherein the top surface of the proportional valve block is provided with four switch valve mounting holes, four two-position two-way high-speed switch valves are mounted in the switch valve mounting holes, and the oil inlets and the oil outlets of the switch valves are communicated with the corresponding oil ports of the proportional valve through oil path branches arranged inside the valve block.
5. A method of controlling a hydraulic valve unit for complex control of digital fluid and continuous fluid according to claim 2, comprising the steps of:
the load is connected with the port A and the port B of the proportional valve, and the movement of oil inlet from the port A and oil outlet from the port B is needed to be realized by setting the load; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve; the oil way is communicated through a port P, a port A, a load, a port B and a port T; at the moment, the load moves rapidly, but the control precision is lower;
when the load reaches the target position quickly, the proportional valve is closed through the movement of the proportional valve spool, namely the port P and the port A of the proportional valve are blocked, and the port B and the port T of the proportional valve are blocked; at the moment, a second switch valve and a fourth switch valve are opened, the first switch valve and the third switch valve are kept closed, oil inlets and oil outlets of the second switch valve and the fourth switch valve are communicated, and an oil way is communicated through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T; at the moment, the load movement speed is slow, but the accurate control is high, so that the load is accurately stopped at the target position;
if the load needs to realize the movement of oil inlet from the port B and oil outlet from the port A; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port B and the port A through the movement of the valve core of the proportional valve; the oil way is communicated through the port P, the port B, the load, the port A and the port T; when the load is fast enough to reach the target position; the proportional valve with large flow is closed through the movement of a valve core of the proportional valve, a port P and a port B of the proportional valve are blocked, and a port A and a port T of the proportional valve are blocked; at the moment, the first switch valve and the third switch valve are opened, the second switch valve and the fourth switch valve are closed, and the oil way is conducted through the port P, the third switch valve, the port B, the load, the port A, the first switch valve and the port T; at the moment, the load moves at a lower speed, but the accurate control is high, so that the load is accurately stopped at the target position.
6. A method of controlling a hydraulic valve unit for complex control of digital fluid and continuous fluid according to claim 5, characterized by:
at the initial moment when the load starts to move, the high-speed switch valve also participates in the work while the proportional valve works;
if the load needs to realize the movement of oil inlet from the port A and oil outlet from the port B, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve at the initial moment when the load starts to move; simultaneously opening a second switch valve and a fourth switch valve, closing the first switch valve and the third switch valve, and conducting an oil path through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T;
if the load needs to realize the movement of oil inlet from the port B and oil outlet from the port A, at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port B and the port A through the movement of the valve core of the proportional valve, the first switch valve and the third switch valve are opened simultaneously, the second switch valve and the fourth switch valve are closed, and the oil way is also communicated through the port P, the third switch valve, the port B, the load, the port A, the first switch valve and the port T.
7. A method of controlling a hydraulic valve unit for complex control of digital fluid and continuous fluid according to claim 3, comprising the steps of:
the load is connected with the port A and the port B of the proportional valve, and the movement of oil inlet from the port A and oil outlet from the port B is needed to be realized by setting the load; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port A and the port B through the movement of the valve core of the proportional valve; the oil way is communicated through a port P, a port A, a load, a port B and a port T; simultaneously opening a second switch valve and a fourth switch valve, closing the first switch valve and the third switch valve, and conducting an oil path through a port P, the second switch valve, a port A, a load, a port B, the fourth switch valve and a port T; when the load is fast enough to reach the target position; all the switch valves are closed, and the oil path is only communicated through a port P, a port A, a load, a port B and a port T of the proportional valve, namely the proportional valve is only adopted for precise control;
if the load needs to realize the movement of oil inlet from the port B and oil outlet from the port A; at the initial moment when the load starts to move, the port P and the port T are respectively communicated with the port B and the port A through the movement of the valve core of the proportional valve; the oil way is communicated through the port P, the port B, the load, the port A and the port T; simultaneously opening the first switch valve and the third switch valve, closing the second switch valve and the fourth switch valve, conducting the oil path through the P port, the third switch valve, the B port, the load, the A port, the first switch valve and the T port, and enabling the load to move rapidly; when the load reaches the target position, all the switch valves are closed, the oil path is conducted only through the port P, the port B, the load, the port A and the port T, and the proportional valve is only adopted for accurate control.
CN202010686708.2A 2020-07-16 2020-07-16 Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof Pending CN111927843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010686708.2A CN111927843A (en) 2020-07-16 2020-07-16 Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010686708.2A CN111927843A (en) 2020-07-16 2020-07-16 Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof

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Publication Number Publication Date
CN111927843A true CN111927843A (en) 2020-11-13

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Application Number Title Priority Date Filing Date
CN202010686708.2A Pending CN111927843A (en) 2020-07-16 2020-07-16 Hydraulic valve unit for composite control of digital fluid and continuous fluid and control method thereof

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