CN109488652B - Case closed-loop control structure and hydraulic control valve - Google Patents
Case closed-loop control structure and hydraulic control valve Download PDFInfo
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- CN109488652B CN109488652B CN201811570742.2A CN201811570742A CN109488652B CN 109488652 B CN109488652 B CN 109488652B CN 201811570742 A CN201811570742 A CN 201811570742A CN 109488652 B CN109488652 B CN 109488652B
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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
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- 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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
Abstract
The invention relates to the field of control valves, and particularly discloses a valve core closed-loop control structure and a hydraulic control valve, wherein the valve core closed-loop control structure comprises a pilot end cover, a main elastic piece, a pilot mechanism and an adjusting mechanism, wherein the pilot end cover is provided with a working cavity and a pilot oil source oil port, and the pilot oil source oil port is used for being communicated with an external pilot oil source; the pilot mechanism is provided with a closing position and a working position, and when the pilot mechanism is positioned at the closing position, the main valve core is positioned at an initial position; when the pilot mechanism is located at the working position, pilot oil can enter the working cavity and drive the main valve core to move to the target position, the main valve core simultaneously forces the main elastic part to elastically deform, and after the main valve core moves to the target position, the main valve core is prevented from deviating from the target position through the adjusting mechanism, so that the main valve core can be guaranteed to accurately stop at the target position, and the influence of friction and hydrodynamic force on the target position precision of the main valve core can be overcome.
Description
Technical Field
The invention relates to the field of control valves, in particular to a valve core closed-loop control structure and a hydraulic control valve.
Background
At present, a hydraulic control valve mostly adopts pilot pressure to directly drive a main valve core to move, and simultaneously adopts a structure that a spring is used for resetting and position control, an oil duct is arranged on the main valve core, the main valve core moves to a target position under the action of the pilot pressure, and hydraulic oil is distributed through the main valve core. The main spool is easily affected by many factors in the moving process, for example, the main spool is hindered by friction and hydraulic force, and these factors can cause that the pilot pressure has a large difference with the target position of the spool, the hydraulic oil distributed by the main spool is not accurate, and further the control precision of the hydraulic valve is reduced. The hydraulic force is that the hydraulic oil generates axial force on the main valve core due to different flow rates of the hydraulic oil flowing through the main valve core, and the axial force is unfavorable for controlling the position precision of the main valve core, so that the target position precision of the main valve core is influenced.
In order to solve the above problems, in the prior art, position control is realized by using a position sensor and an electric control valve core of a controller, but a hydraulic valve adopts electric control, needs a special controller and control logic, and has obvious defects in control reliability and cost.
Therefore, a valve core closed-loop control structure and a hydraulic control valve are needed to solve the above problems.
Disclosure of Invention
The invention aims to: the utility model provides a case closed-loop control structure and hydraulic control valve to solve among the prior art problem that the case of hydraulic control valve easily receives frictional force and hydraulic power's hindrance to lead to hydrovalve control accuracy to reduce.
The present invention provides a spool closed-loop control structure for controlling a position of a main spool of a hydraulic control valve, the main spool having an initial position and a target position, the spool closed-loop control structure including:
the pilot end cover is provided with a working cavity and a pilot oil source oil port, one end of the main valve core is slidably located in the working cavity, and the pilot oil source oil port is used for being communicated with an external pilot oil source;
a main elastic element always having a tendency to drive the main spool towards the initial position;
the pilot mechanism is provided with a closing position and a working position, when the pilot mechanism is located at the closing position, the pilot oil source oil port is not communicated with the working cavity, and the main valve core is located at the initial position; when the pilot mechanism is located at the working position, the pilot oil source oil port can be communicated with the working cavity, and pilot oil can pass through the pilot oil source oil port and enter the working cavity and can drive the main valve core to move to the target position;
an adjustment mechanism; when the pilot mechanism is located at the working position, the adjusting mechanism is used for preventing the main valve core from deviating from the target position.
Preferably, the pilot mechanism includes a pilot valve core and a pilot signal assembly, the pilot valve core is provided with an oil guide channel communicated with the working cavity, the pilot valve core has a closing position and a working position, when the pilot valve core is located at the closing position, the pilot oil source oil port is not communicated with the oil guide channel, and the main valve core is located at the initial position; when the pilot valve core is located at the working position, the pilot oil source oil port can be communicated with the oil guide channel; pilot oil can sequentially pass through the pilot oil source oil port and the pilot oil channel and enter the working cavity;
the pilot signal assembly is used for driving the pilot valve core to switch between the closing position and the working position.
Preferably, the hydraulic control system further comprises an oil return passage, and when the pilot mechanism is located at the working position:
when the main valve core does not reach the target position, the adjusting mechanism controls the pilot oil source port to be communicated with the working cavity and controls the oil return channel not to be communicated with the working cavity; when the main valve core reaches the target position, the adjusting mechanism controls the pilot oil source port and the oil return channel to be not communicated with the working cavity; when the main valve core exceeds the target position, the adjusting mechanism controls the pilot oil source oil port and the working cavity to be not communicated and controls the oil return channel and the working cavity to be communicated.
Preferably, a pilot cavity is arranged on the pilot end cover, and the adjusting mechanism comprises:
the pilot valve sleeve is slidably positioned in the pilot cavity and is sleeved on the pilot valve core in a sliding manner, a first oil hole and a second oil hole are formed in the pilot valve sleeve at intervals, the first oil hole is communicated with the pilot oil source oil hole, and the second oil hole is communicated with the oil return channel; when the pilot valve core is located at the closing position, the oil guide channel is not communicated with the first oil hole and the second oil hole; when the pilot valve core is positioned at the working position, the pilot valve sleeve is provided with a first position which only enables the first oil hole to be communicated with the oil guide channel; a second position at which both the first oil hole and the second oil hole are not communicated with the oil guide passage; and a third position where only the second oil hole is communicated with the oil guide passage; the first position, the second position and the third position are sequentially arranged along the axial direction of the pilot valve core, and when the pilot valve core moves from the closing position to the working position just now, the pilot valve sleeve is located at the first position;
when the pilot valve core is positioned at the working position, the pilot elastic piece always has the tendency of driving the pilot valve sleeve to move to the first position;
and the main valve core is in driving connection with the adjusting component, when the main valve core moves in the direction from the initial position to the target position, the main valve core drives the pilot valve sleeve to move in the direction from the first position to the third position through the adjusting component, and when the main valve core is located at the target position, the pilot valve sleeve is located at the second position.
Preferably, the pilot signal assembly comprises a pilot signal oil port and a signal cavity which are arranged on the pilot end cover, and a reset elastic piece;
the signal cavity and the pilot cavity are arranged at intervals and are communicated with the pilot signal oil port, and pilot signal oil can enter the signal cavity from the pilot signal oil port and push the pilot valve core to move from the closing position to the working position;
the reset elastic piece always has the tendency of driving the pilot valve core to move from the working position to the closing position.
Preferably, the elastic reset component is a reset pressure spring, the pilot valve core comprises a rod part penetrating through the pilot valve sleeve and a piston part connected with the rod part, the piston part is slidably located in the signal cavity and divides the signal cavity into a rod cavity and a rodless cavity, the reset pressure spring is located in the rodless cavity, two ends of the rodless cavity are respectively abutted to the piston part and the cavity wall of the rodless cavity, and the pilot signal oil port is communicated with the rod cavity.
Preferably, the oil guide passage includes a communicating portion disposed inside the pilot valve element, and a first oil passage hole and a second oil passage hole respectively located at two ends of the communicating portion, the first oil passage hole and the second oil passage hole are both disposed along a radial direction of the pilot valve element, the first oil passage hole is communicated with the working chamber, and the second oil passage hole is communicated with or not communicated with the first oil hole and the second oil hole.
Preferably, the adjusting assembly comprises a lever, the middle position of the lever is pivoted to the pilot end cover, one end of the lever is in driving connection with the pilot valve sleeve, a groove is formed in the main valve element, and the other end of the lever is located in the groove.
Preferably, the adjusting assembly further comprises a limit pin inserted into the pilot end cover, when the pilot valve core is located at the closed position, the limit pin is in tangential fit with the lever, and when the pilot valve core is located at the working position, the limit pin is separated from the lever.
Preferably, the first oil hole includes an axial damping hole and a radial damping hole which are vertically communicated, the axial damping hole extends in an axial direction of the pilot valve sleeve, the axial damping hole is continuously communicated with the pilot oil source oil port during movement of the pilot valve sleeve, and the radial damping hole passes through the pilot valve sleeve and is selectively communicated with the oil guide channel.
The invention also provides a hydraulic control valve which comprises the valve core closed-loop control structure and the main valve core in any scheme.
Preferably, the valve further comprises a main valve body, the two valve core closed-loop control structures are oppositely arranged at two ends of the main valve body, the main valve core penetrates through the main valve body, two ends of the main valve core are respectively located in the two pilot end covers, the main valve core is provided with two grooves, the main elastic part is a main pressure spring, and the two main pressure springs are respectively located in the two working cavities.
Preferably, the main valve body is provided with a valve cavity, two ends of the valve cavity are respectively communicated with two ends of the working cavity, the main valve core is arranged in the valve cavity in a sliding mode, and the main valve body is further provided with two working oil ports, two oil return oil ports and a main pump oil port at intervals.
The invention has the beneficial effects that:
1) the valve core closed-loop control structure provided by the invention has the advantages that the pilot mechanism has a closing position and a working position, and when the pilot mechanism is positioned at the closing position, the main valve core is positioned at an initial position; when the pilot mechanism is located at the working position, pilot oil can enter the working cavity and drive the main valve core to move to the target position, the main valve core simultaneously forces the main elastic part to elastically deform, and after the main valve core moves to the target position, the main valve core is prevented from deviating from the target position through the adjusting mechanism, so that the main valve core can be guaranteed to accurately stop at the target position, and the influence of friction and hydrodynamic force on the target position precision of the main valve core can be overcome.
2) The specific position of the working position of the pilot valve core is controlled through the oil pressure of pilot signal oil, so that the second position of the pilot valve sleeve and the target position of the main valve core are controlled, and the closed-loop control of the target position of the main valve core is realized through the main valve core, the adjusting assembly, the pilot valve sleeve and the pilot elastic piece. Compared with the prior art, the influence of friction and hydraulic force on the position precision of the main valve core can be minimized in the reciprocating motion process of the main valve core, and the accuracy of the target position of the main valve core is guaranteed.
3) And the first oil through hole and the second oil through hole are perpendicular to the communicating part, so that the jet angles of the first oil through hole and the second oil through hole are both 90 degrees, the hydraulic force cannot influence the target position precision of the pilot valve element, and the target position precision of the main valve element is further ensured.
Drawings
FIG. 1 is a schematic diagram of a hydraulic control valve according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a valve core closed-loop control structure in the embodiment of the invention.
In the figure:
100. a valve core closed-loop control structure;
1. a pilot end cap; 11. a pilot cavity; 12. a working chamber; 13. a pilot signal oil port; 14. a signal cavity; 15. a pilot oil source port; 16. a pilot oil path; 17. a first process plug;
2. a primary elastic member;
3. a pilot valve housing; 31. a first oil hole; 311. an axial damping bore; 312. a radial damping orifice; 32. a second oil hole;
4. a pilot valve spool; 41. an oil guide channel; 411. a communicating portion; 412. a first oil passage; 413. a second oil through hole; 42. a second process plug;
5. a pilot spring;
6. an adjustment assembly; 61. a lever; 62. a spacing pin; 63. a fulcrum pin;
7. a main valve element; 71. a groove;
8. a restoring elastic member;
9. a main valve body; 91. a working oil port; 92. an oil return port; 93. a main pump oil port; 94. an oil return passage.
Detailed Description
The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1 to 2, the present embodiment provides a valve element closed-loop control structure, which is used for controlling a position of a main valve element 7 of a hydraulic control valve, where the valve element closed-loop control structure 100 includes a pilot end cover 1, a main elastic component 2, a pilot mechanism and an adjusting mechanism, the pilot end cover 1 is provided with a working cavity 12 and a pilot oil source port 15, one end of the main valve element 7 is slidably located in the working cavity 12, and the pilot oil source port 15 is used for communicating with an external pilot oil source; the pilot mechanism has a closing position and a working position, when the pilot mechanism is located at the closing position, the pilot oil source port 15 is not communicated with the working cavity 12, and the main valve core 7 is located at the initial position; when the pilot mechanism is located at the working position, the pilot oil source oil port 15 is communicated with the working cavity 12, and pilot oil can enter the working cavity 12 through the pilot oil source oil port 15 and can drive the main valve element 7 to move to a target position; the adjustment mechanism is used to prevent main spool 7 from deviating from the target position when the pilot mechanism is in the operating position. In the prior art, the main valve element 7 is influenced by friction force and hydraulic force in the process of moving to the target position, so that the difference between the actual stop position of the main valve element 7 and the target position is easily caused, and the main valve element 7 can be ensured to be accurately stopped at the target position by the adjusting mechanism, so that the main valve element 7 is not influenced by the friction force and the hydraulic force. The main elastic element 2 always has the tendency of driving the main valve element 7 to move close to the initial position, and when the pilot oil is drained from the working chamber, the main valve element 7 is driven to return to the initial position by the main elastic element 2.
The pilot mechanism comprises a pilot valve core 4 and a pilot signal assembly, an oil guide channel 41 communicated with the working cavity 12 is arranged on the pilot valve core 4, the pilot valve core 4 is provided with a closing position and a working position, when the pilot valve core 4 is positioned at the closing position, the pilot oil source oil port 15 is not communicated with the oil guide channel 41, and the main valve core 7 is positioned at an initial position; when the pilot valve spool 4 is located at the working position, the pilot oil source port 15 can communicate with the oil guide passage 41, so that the pilot oil can sequentially pass through the pilot oil source port 15 and the oil guide passage 41 and enter the working chamber 12 for driving the main valve spool 7 to move. The pilot signal assembly is then used to drive the pilot spool 4 between the closed position and the operating position.
The pilot signal assembly comprises a pilot signal oil port 13 and a signal cavity 14 which are arranged on the pilot end cover 1, and a reset elastic piece 8. The reset elastic piece 8 always has a tendency of driving the pilot valve core 4 to move from the working position to the closing position, the signal cavity 14 and the pilot cavity 11 are arranged at intervals and communicated with the pilot signal oil port 13, and the pilot signal oil can enter the signal cavity 14 from the pilot signal oil port 13 and push the pilot valve core 4 to move from the closing position to the working position and press the reset elastic piece 8 to elastically deform. Specifically, the elastic component 8 that resets is the pressure spring that resets, and pilot valve core 4 is including wearing to locate the pole portion in the pilot valve cover 3 and the piston portion of being connected with the pole portion, and the piston portion slides and is located signal chamber 14 and separates into with signal chamber 14 has pole chamber and no pole chamber, and in this embodiment, the pressure spring that resets is located no pole chamber and its both ends respectively with the chamber wall butt in piston portion and no pole chamber, pilot signal hydraulic fluid port 13 with have the pole chamber to communicate. After the pilot signal oil enters the rod cavity, the pilot valve core 4 is driven to compress the reset pressure spring, and the pilot valve core 4 enters the working position from the closing position. It will be understood that the operating position in this embodiment refers to any position in which the pilot valve spool 4 is out of the closed position.
In this embodiment, when the pilot mechanism is located at the working position, main spool 7 has the following states: when the main valve element 7 does not reach the target position, the adjusting mechanism controls the pilot oil source oil port 15 to be communicated with the working cavity 12 and controls the oil return passage 94 to be not communicated with the working cavity 12, and at the moment, the pilot oil continuously drives the main valve element 7 to move to the target position; when the main valve core 7 is located at the target position, the adjusting mechanism controls the pilot oil source oil port 15 and the oil return passage 94 to be not communicated with the working cavity 12, and at the moment, the pilot valve core 4 is not influenced by external force; when the main valve element 7 exceeds the target position, the adjusting mechanism controls the pilot oil source port 15 not to be communicated with the working chamber 12 and controls the oil return passage 94 to be communicated with the working chamber 12, at the moment, the pilot oil pressure is reduced, and under the action of the main elastic element 2, the main valve element 7 moves towards the direction close to the initial position. When the pilot mechanism just moves from the closed position to the working position, the adjusting mechanism controls the pilot oil source port 15 to be communicated with the working chamber 12 and the oil return passage 94 to be not communicated with the working chamber 12, so that the main valve element 7 moves from the initial position to the target position after the pilot mechanism reaches the working position. After the main valve element 7 moves to the target position, the main valve element 7 cannot stop immediately under the inertia of the main valve element 7, the pilot oil is increased or reduced according to the real-time position of the main valve element 7 under the adjusting action of the adjusting mechanism, and then the main valve element 7 can reciprocate on two sides of the target position by matching with the main elastic part 2, and the moving amplitude of the main valve element 7 is smaller and smaller under the action of friction force and finally stops at the target position, so that the friction force cannot influence the target position of the main valve element 7, and the accuracy of the target position of the main valve element 7 can be ensured.
It should be noted that, in the present embodiment, the target position not yet reached means that main spool 7 is located between the initial position and the target position, and the target position beyond and the target position not yet reached are opposite with respect to the target position, specifically, means a position after main spool 7 has reached the target position from the initial position and passed the target position.
Specifically, a pilot cavity 11 is arranged on the pilot end cover 1, the adjusting mechanism comprises a pilot valve sleeve 3, a pilot elastic part 5 and an adjusting assembly 6, the pilot valve sleeve 3 is slidably arranged in the pilot cavity 11 and slidably sleeved on the pilot valve core 4, a first oil hole 31 and a second oil hole 32 are arranged on the pilot valve sleeve 3 at intervals, the first oil hole 31 is communicated with the pilot oil source oil port 15, and the second oil hole 32 is communicated with the oil return channel 94. When the pilot spool 4 is in the closed position, the oil guide passage 41 is not communicated with both the first oil hole 31 and the second oil hole 32; at this time, working chamber 12 is not communicated with the pilot oil source and return passage 94, and main spool 7 is held at the initial position. When the pilot spool 4 is in the operating position, the pilot sleeve 3 has a first position at which the first oil hole 31 is communicated with the oil guide passage 41 and the second oil hole 32 is not communicated with the oil guide passage 41, a second position at which both the first oil hole 31 and the second oil hole 32 are not communicated with the oil guide passage 41, and a third position at which the second oil hole 32 is communicated with the oil guide passage 41 and the first oil hole 31 is not communicated with the oil guide passage 41. Accordingly, when the pilot valve sleeve 3 is located at the first position, the pilot oil enters the working chamber 12 through the pilot oil source port 15 and drives the main valve element 7 to move to the target position, in the process, the main valve element 7 forces the main elastic member 2 to deform, when the pilot valve sleeve 3 is located at the second position, the working chamber 12 is not communicated with the pilot oil source port 15 and the oil return passage 94, and the main valve element 7 is not driven by external power. When the pilot valve sleeve 3 is located at the third position, the pilot oil in the working chamber 12 is discharged from the oil return passage 94 through the oil guide passage 41 and the second oil hole 32 in order, the hydraulic pressure provided by the pilot oil applied to the main spool 7 is reduced, and the main spool 7 is moved in a direction close to the initial position by the main elastic member 2. In this embodiment, the first position, the second position, and the third position are sequentially arranged along the axial direction of the pilot valve core 4, and specifically, the three positions may be sequentially adjacent to each other, so that when the pilot valve sleeve 3 moves from the first position to the third position, as long as the pilot valve sleeve 3 has a certain inertia, the pilot valve sleeve 3 may directly cross the second position and move to the third position when moving to the second position, and similarly, when the pilot valve sleeve 3 moves from the third position to the direction of the first position, the pilot valve sleeve 3 may directly cross the second position and move to the first position when moving to the second position.
When the pilot valve spool 4 is in the working position, the pilot valve sleeve 3 is moved back and forth between the first position to the third position by the pilot elastic member 5 and the adjustment assembly 6. The pilot elastic member 5 always has a tendency to drive the pilot valve sleeve 3 to move to the first position; the main valve element 7 is in driving connection with the adjusting assembly 6, when the main valve element 7 moves in the direction from the initial position to the target position, the main valve element 7 drives the pilot valve sleeve 3 via the adjusting assembly 6 and moves the pilot valve sleeve 3 in the direction from the first position to the third position, and when the main valve element 7 is in the target position, the pilot valve sleeve 3 is in the second position.
In this embodiment, the specific position of the working position of the pilot valve element 4 is controlled by the oil pressure of the pilot signal oil, so as to control the second position of the pilot valve sleeve 3 and the target position of the main valve element 7, and the closed-loop control of the target position of the main valve element 7 is realized by the main valve element 7, the adjusting assembly 6, the pilot valve sleeve 3 and the pilot elastic element 5. Compared with the prior art, the influence of friction and hydraulic force on the position precision of the main valve core 7 can be minimized in the reciprocating motion process of the main valve core 7, and the position accuracy of the main valve core 7 is ensured.
Be equipped with the intercommunicating pore between signal chamber 14 and the guide chamber 11, signal chamber 14, intercommunicating pore and guide chamber 11 communicate in proper order and all coaxial line sets up, the pole portion of pilot valve core 4 slides and wears to locate the intercommunicating pore and with the sealed cooperation of intercommunicating pore, the one end of pole portion slides and wears to locate guide valve cover 3 and be located guide chamber 11, the other end is connected with piston portion and is located signal chamber 14, the aperture of signal chamber 14 and guide chamber 11 all is greater than the aperture of intercommunicating pore.
The pilot valve sleeve 3 includes a first end and a second end, and the working chamber 12 and the first end of the pilot valve sleeve 3 are located on the same side of the adjustment assembly 6, facilitating a simplification of the spatial volume of the valve spool closed-loop control structure 100.
The pilot elastic member 5 and the main elastic member 2 are both compression springs. Two ends of the pilot pressure spring are respectively abutted against the cavity wall of the pilot cavity 11 and the first end of the pilot valve sleeve 3. The main pressure spring is abutted against the main valve core 7 and the pilot valve sleeve 3 and applies a force to the main valve core 7 close to the working chamber 12, and the adjusting component 6 drives the pilot valve sleeve 3 to move through the second end of the pilot valve sleeve 3. In other embodiments, a boss may be disposed at one end of main valve element 7 located in working chamber 12, the boss is slidably located in working chamber 12 and divides working chamber 12 into a first chamber and a second chamber, a main pressure spring may be sleeved on main valve element 7 and located in the second chamber, two ends of the main pressure spring respectively abut against a chamber wall of the second chamber and one end of the boss, and the first chamber is communicated with pilot oil path 16. The pilot elastic member 5 and the main elastic member 2 may be a tension spring, an elastic cushion, or the like. In other embodiments, the pilot tension spring is respectively connected with the second end of the pilot valve sleeve 3 and the cavity wall of the pilot cavity 11; the pilot elastic element 5 and the main elastic element 2 may also be tension springs, when the main elastic element 2 is a tension spring, the main tension spring may be located in the working chamber 12, and two ends of the main tension spring are respectively connected with the chamber walls of the main valve core 7 and the working chamber 12.
The oil guide passage 41 includes a communicating portion 411 disposed inside the pilot valve spool 4, and a first oil passing hole 412 and a second oil passing hole 413 respectively located at two ends of the communicating portion 411, the first oil passing hole 412 and the second oil passing hole 413 are both disposed along a radial direction of the pilot valve spool 4, the first oil passing hole 412 is communicated with the working chamber 12, and the second oil passing hole 413 is alternatively communicated with or not communicated with the first oil hole 31 and the second oil hole 32. Preferably, the communicating portion 411 extends in the axial direction of the pilot valve core 4, a pilot oil path 16 is further provided on the pilot end cover 1, two ends of the pilot oil path 16 are respectively communicated with the working chamber 12 and the pilot chamber 11, it can be understood that the first oil passage hole 412 is located outside the pilot valve sleeve 3 and inside the pilot chamber 11, and during the movement of the pilot valve sleeve 3, the first oil passage hole 412 can be communicated with the working chamber 12 through the pilot oil path 16. Since the first oil passage hole 412 and the second oil passage hole 413 are both perpendicular to the communicating portion 411, the flow angles of the first oil passage hole 412 and the second oil passage hole 413 are both 90 °, and the influence of the hydraulic force on the accuracy of the target position of the main spool 7 is small. In this embodiment, the plurality of first oil holes 412 and the plurality of second oil holes 413 are provided at equal intervals in the circumferential direction of the pilot valve core 4.
The extending direction of the working cavity 12 and the extending direction of the pilot cavity 11 are arranged in parallel, in order to facilitate the processing of the pilot oil path 16, a blind hole can be processed on the pilot end cover 1, the blind hole penetrates through the pilot cavity 11 and is communicated with the working cavity 12, and a first process plug 17 is installed at an opening of the blind hole. The communicating portion 411 may be drilled at an end of the pilot spool 4 remote from the signal chamber 14 by a drilling machine, the first oil passing hole 412 is communicated with a bottom end of the communicating portion 411, the second oil passing hole 413 is communicated with an intermediate position of the communicating portion 411, and a second process stopper 42 is provided at an opening end of the communicating portion 411 for preventing leakage of pilot oil from the oil guide passage 41.
The adjusting assembly 6 comprises a lever 61, the middle position of the lever 61 is pivoted to the pilot end cover 1 through a fulcrum pin 63, one end of the lever 61 is in driving fit with the pilot valve sleeve 3, a groove 71 is arranged on the main valve element 7, the groove 71 is located at one end of the working chamber 12 away from the main valve element 7, and the other end of the lever 61 is located in the groove 71. When the main valve element 7 moves to a side far away from the working chamber 12, the side wall of the groove 71 contacts with the lever 61 and pushes the lever 61 to rotate, and then the lever 61 pushes the second end of the pilot valve sleeve 3 to make the pilot valve sleeve 3 press the pilot pressure spring to deform. In other embodiments, the lever 61 may also be a pull rope, one end of the pull rope is connected to one end of the main valve spool 7 located in the working chamber 12, and the other end of the pull rope is connected to the first end of the pilot valve sleeve 3.
The adjusting assembly 6 further comprises a limit pin 62, the limit pin 62 is inserted into the pilot end cover 1, when the pilot valve core 4 is located at the closed position, the limit pin 62 is in tangential fit with the lever 61, and when the pilot valve core 4 leaves the closed position, the limit pin 62 is separated from the lever 61. Preferably, when the lever 61 and the limit pin 62 are tangent, the extending direction of the lever 61 is perpendicular to the extending direction of the working chamber 12, that is, the extending direction of the lever 61 is perpendicular to the axial direction of the main valve spool 7 and the axial direction of the pilot valve sleeve 3, and the lever 61 is vertically located in the groove 71. The limit pin 62 prevents the end of the lever 61 located in the groove 71 from disengaging from the groove 71 when the pilot valve spool 4 is in the closed position, resulting in failure of the closed-loop control structure 100. It will be appreciated that when main spool 7 moves away from working chamber 12, the end of lever 61 located within recess 71 will not disengage from recess 71, subject to the range of movement of main spool 7.
The pilot end cover 1 is provided with a pilot oil source port 15, the pilot oil source port 15 is used for being communicated with a pilot oil source, the first oil hole 31 comprises an axial damping hole 311 and a radial damping hole 312 which are vertically communicated, the axial damping hole 311 extends along the axial direction of the pilot valve sleeve 3, when the pilot valve sleeve 3 moves, the axial damping hole 311 is continuously communicated with the pilot oil source port 15, and the radial damping hole 312 penetrates through the pilot valve sleeve 3 and is selectively communicated with the pilot oil channel 41. In this embodiment, the second oil hole 32 is also provided as a damping hole.
The control principle of the valve core closed-loop control structure 100 in the embodiment is as follows:
when pilot valve core 4 is just located at the working position, when pilot valve sleeve 3 is located at the first position, pilot oil is injected into working chamber 12 through pilot oil source 15 and drives main valve core 7 to move towards the target position against the action force of main elastic element 2, main valve core 7 drives pilot valve sleeve 3 to move towards the second position through regulating assembly 6 along with the movement of main valve core 7, when main valve core 7 just moves to the target position, pilot valve sleeve 3 is just located at the second position, when the hydraulic pressure applied to main valve core 7 is kept unchanged, main valve core 7 will move towards the direction exceeding the target position under the inertia effect, when pilot valve sleeve 3 crosses the second position and moves to the third position under the inertia effect, pilot oil in working chamber 12 will start to be discharged outwards through return passage 94, so that the hydraulic pressure of pilot oil on main valve core 7 is reduced, main elastic element 2 will drive main valve core 7 to change the moving direction and move towards the direction returning to the target position, meanwhile, the acting force of the main valve core 7 on the pilot valve sleeve 3 through the adjusting assembly 6 is weakened, under the driving of the pilot elastic element 5, the pilot valve sleeve 3 synchronously changes the moving direction and moves from the third position to the second position, as the main valve core 7 reaches the target position, the pilot valve sleeve 3 reaches the second position, under the inertia effect of the pilot valve sleeve 3 and the main valve core 7, the pilot valve sleeve 3 will cross the second position and directly move to the first position, the main valve core 7 also moves in the direction close to the initial position after crossing the target position, the pilot oil source port 15 re-injects pilot oil into the working chamber 12, the hydraulic pressure of the pilot oil on the main valve core 7 is increased, when the hydraulic pressure provided by the pilot oil on the main valve core 7 is greater than the restoring force applied by the main elastic element 2 on the main valve core 7, the moving normal direction of the main valve core 7 will change, the main valve core 7 moves close to the target position again and forces the main elastic element 2 to generate elastic, meanwhile, the main valve core 7 drives the adjusting assembly 6 to drive the pilot valve sleeve 3 to change the moving direction and move from the first position to the second position, the main valve core 7 repeats the above cycle, and during the cycle, because the main valve core 7 is hindered by friction, the amplitude of the reciprocating motion of the main valve core 7 gradually decreases, which means that when the pilot valve sleeve 3 is located at the first position or the third position, the maximum opening degree of the first oil hole 31 and the second oil hole 32 gradually decreases, the hydraulic pressure of the pilot oil on the main valve core 7 and the acting force of the main return spring on the main valve core 7 tend to be balanced, and the acting force of the pilot elastic member 5 and the adjusting assembly 6 on the pilot valve sleeve 3 also tend to be balanced, and finally the pilot valve sleeve 3 stably stops at the second position, and the corresponding main valve core 7 stops at the target position.
The embodiment also provides a hydraulic control valve, which comprises the valve core closed-loop control structure 100 and the main valve core 7 in the scheme.
The hydraulic control valve further comprises a main valve body 9, the two valve core closed-loop control structures 100 are oppositely arranged at two ends of the main valve body 9, the main valve core 7 penetrates through the main valve body 9, two ends of the main valve core 7 are respectively located in working cavities 12 of the two pilot end covers 1, and correspondingly, the two main pressure springs are respectively located in the two working cavities 12. The main valve element 7 is provided with two grooves 71, specifically, the main valve body 9 is provided with a valve cavity, two ends of the valve cavity are respectively communicated with one ends of two working chambers 12, the main valve element 7 is slidably arranged in the valve cavity, the main valve body 9 is further provided with two working oil ports 91, two oil return ports 92 and a main pump oil port 93 at intervals, the two working oil ports 91 are used for being connected with a movement execution component (such as a hydraulic oil cylinder and the like) through pipelines, the main pump oil port 93 is used for being connected with a hydraulic oil tank through a pipeline, and the two oil return ports 92 are also connected with the hydraulic oil. The oil return passage 94 is disposed on the main valve seat, and the two oil return passages 94 are respectively communicated with the two oil return ports 92. The valve core closed-loop control structures 100 are respectively arranged corresponding to the working oil ports 91 and the oil return ports 92 one by one, and when the pilot valve core 7 of one of the valve core closed-loop control structures 100 is located at a working position, the main pump oil port 93 can be communicated with the corresponding working oil port 91; the pilot valve core 7 of the other core closed-loop control structure 100 is located at the closed position and is communicated with the working oil port 91 and the oil return port 92 corresponding to the pilot valve core.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A spool closed-loop control structure for controlling a position of a main spool (7) of a hydraulic control valve, the main spool (7) having an initial position and a target position, characterized by comprising:
the pilot end cover (1) is provided with a working cavity (12) and a pilot oil source oil port (15), one end of the main valve core (7) is slidably located in the working cavity (12), and the pilot oil source oil port (15) is communicated with an external pilot oil source;
a main elastic element (2) always having a tendency to drive said main spool (7) towards said initial position;
the pilot mechanism is provided with a closing position and a working position, when the pilot mechanism is located at the closing position, the pilot oil source oil port (15) is not communicated with the working cavity (12), and the main valve core (7) is located at the initial position; when the pilot mechanism is located at the working position, the pilot oil source oil port (15) can be communicated with the working cavity (12), and pilot oil can pass through the pilot oil source oil port (15) and enter the working cavity (12) and can drive the main valve core (7) to move to the target position;
an adjustment mechanism; when the pilot mechanism is located at the working position, the adjusting mechanism is used for preventing the main valve core (7) from deviating from the target position;
the pilot mechanism comprises a pilot valve core (4) and a pilot signal assembly, an oil guide channel (41) communicated with the working cavity (12) is arranged on the pilot valve core (4), the pilot valve core (4) is provided with a closing position and a working position, when the pilot valve core (4) is located at the closing position, the pilot oil source oil port (15) is not communicated with the oil guide channel (41), and the main valve core (7) is located at the initial position; when the pilot valve core (4) is located at the working position, the pilot oil source oil port (15) can be communicated with the oil guide channel (41); the pilot oil can sequentially pass through the pilot oil source oil port (15) and the oil guide channel (41) and enter the working cavity (12);
the pilot signal assembly is used for driving the pilot valve core (4) to switch between the closing position and the working position;
the valve core closed-loop control structure further comprises an oil return channel (94), and when the pilot mechanism is located at the working position:
when the main valve core (7) does not reach the target position, the adjusting mechanism controls the pilot oil source port (15) to be communicated with the working cavity (12) and controls the oil return passage (94) not to be communicated with the working cavity (12); when the main valve core (7) reaches the target position, the adjusting mechanism controls the pilot oil source port (15) and the oil return passage (94) to be not communicated with the working cavity (12); when the main valve core (7) exceeds the target position, the adjusting mechanism controls the pilot oil source port (15) and the working cavity (12) not to be communicated and controls the oil return passage (94) and the working cavity (12) to be communicated;
be equipped with pilot chamber (11) on pilot end cover (1), adjustment mechanism includes:
the pilot valve sleeve (3) is slidably positioned in the pilot cavity (11) and is slidably sleeved on the pilot valve core (4), a first oil hole (31) and a second oil hole (32) are formed in the pilot valve sleeve (3) at intervals, the first oil hole (31) is communicated with the pilot oil source oil port (15), and the second oil hole (32) is communicated with the oil return channel (94); when the pilot valve spool (4) is in the closed position, the oil guide passage (41) is not communicated with the first oil hole (31) and the second oil hole (32); when the pilot spool (4) is in the working position, the pilot valve sleeve (3) has a first position in which only the first oil hole (31) communicates with the oil guide passage (41); a second position at which both the first oil hole (31) and the second oil hole (32) are not communicated with the oil guide passage (41); and a third position where only the second oil hole (32) is communicated with the oil guide passage (41); the first position, the second position and the third position are sequentially arranged along the axial direction of the pilot valve core (4), and when the pilot valve core (4) moves from the closing position to the working position just now, the pilot valve sleeve (3) is located at the first position;
the pilot elastic piece (5) always has the tendency of driving the pilot valve sleeve (3) to move to the first position when the pilot valve core (4) is located at the working position;
an adjusting assembly (6), wherein the main valve spool (7) is in driving connection with the adjusting assembly (6), when the main valve spool (7) moves in the direction from the initial position to the target position, the main valve spool (7) drives the pilot valve sleeve (3) to move in the direction from the first position to the third position through the adjusting assembly (6), and when the main valve spool (7) is located in the target position, the pilot valve sleeve (3) is located in the second position.
2. The valve core closed-loop control structure according to claim 1, characterized in that a pilot signal assembly comprises a pilot signal oil port (13) and a signal cavity (14) which are arranged on the pilot end cover (1), and a reset elastic piece (8);
the signal cavity (14) and the pilot cavity (11) are arranged at intervals and are communicated with the pilot signal oil port (13), and pilot signal oil can enter the signal cavity (14) from the pilot signal oil port (13) and push the pilot valve core (4) to move from the closing position to the working position;
the reset elastic piece (8) always has the tendency of driving the pilot valve core (4) to move from the working position to the closing position.
3. The valve core closed-loop control structure according to claim 2, wherein the return elastic member (8) is a return compression spring, the pilot valve core (4) includes a rod portion inserted into the pilot valve sleeve (3) and a piston portion connected to the rod portion, the piston portion is slidably located in the signal cavity (14) and divides the signal cavity (14) into a rod cavity and a rodless cavity, the return compression spring is located in the rodless cavity and has two ends respectively abutted against the cavity walls of the piston portion and the rodless cavity, and the pilot signal oil port (13) is communicated with the rod cavity.
4. The valve element closed-loop control structure according to claim 1, wherein the oil guide passage (41) includes a communicating portion (411) provided inside the pilot valve element (4), and a first oil passing hole (412) and a second oil passing hole (413) respectively provided at both ends of the communicating portion (411), the first oil passing hole (412) and the second oil passing hole (413) are both provided in a radial direction of the pilot valve element (4), and the first oil passing hole (412) communicates with the working chamber (12), and the second oil passing hole (413) communicates with either or neither of the first oil hole (31) and the second oil hole (32).
5. The closed-loop control structure of the valve core as recited in claim 4, characterized in that the adjusting assembly (6) comprises a lever (61), the middle position of the lever (61) is pivoted to the pilot end cover (1), one end of the lever (61) is in driving connection with the pilot valve sleeve (3), a groove (71) is formed on the main valve core (7), and the other end of the lever (61) is located in the groove (71).
6. The closed-loop control structure of the valve core according to claim 5, characterized in that the adjusting component (6) further comprises a limit pin (62) inserted into the pilot end cover (1), when the pilot valve core (4) is located at the closed position, the limit pin (62) is in tangential fit with the lever (61), and when the pilot valve core (4) is located at the working position, the limit pin (62) is separated from the lever (61).
7. The poppet closed-loop control structure as claimed in claim 1, wherein the first oil hole (31) comprises an axial damping hole (311) and a radial damping hole (312) which are vertically communicated, the axial damping hole (311) extends along an axial direction of the pilot valve sleeve (3), the axial damping hole (311) is continuously communicated with the pilot oil source port (15) during the movement of the pilot valve sleeve (3), and the radial damping hole (312) passes through the pilot valve sleeve (3) and is selectively communicated with the pilot oil channel (41).
8. A hydraulic control valve comprising a spool closed-loop control structure (100) according to any one of claims 1 to 7 and a main spool (7).
9. The hydraulic control valve according to claim 8, further comprising a main valve body (9), wherein two spool closed-loop control structures (100) are oppositely disposed at two ends of the main valve body (9), the main valve spool (7) is inserted into the main valve body (9), two ends of the main valve spool (7) are respectively located in two pilot end covers (1), two grooves (71) are disposed on the main valve spool (7), the main elastic member (2) is a main compression spring, and the two main compression springs are respectively located in two working cavities (12).
10. The hydraulic control valve according to claim 9, wherein a valve cavity is disposed on the main valve body (9), two ends of the valve cavity are respectively communicated with one end of the two working chambers (12), the main valve core (7) is slidably disposed in the valve cavity, and two working oil ports (91), two oil return ports (92) and a main pump oil port (93) are further disposed on the main valve body (9) at intervals.
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| CN201811570742.2A CN109488652B (en) | 2018-12-21 | 2018-12-21 | Case closed-loop control structure and hydraulic control valve |
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| CN201811570742.2A CN109488652B (en) | 2018-12-21 | 2018-12-21 | Case closed-loop control structure and hydraulic control valve |
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| CN109488652B true CN109488652B (en) | 2020-06-02 |
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|---|---|
| CN109488652A (en) | 2019-03-19 |
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