CN114876893B - Two-stage hydraulic speed regulating system and hydraulic support - Google Patents

Two-stage hydraulic speed regulating system and hydraulic support Download PDF

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Publication number
CN114876893B
CN114876893B CN202210451720.4A CN202210451720A CN114876893B CN 114876893 B CN114876893 B CN 114876893B CN 202210451720 A CN202210451720 A CN 202210451720A CN 114876893 B CN114876893 B CN 114876893B
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port
inlet
liquid
valve
state
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CN114876893A (en
Inventor
韦文术
王伟
卢德来
李向波
姚卓
赵玉贝
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Beijing Meike Tianma Automation Technology Co Ltd
Beijing Tianma Intelligent Control Technology Co Ltd
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Beijing Meike Tianma Automation Technology Co Ltd
Beijing Tianma Intelligent Control Technology Co Ltd
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Priority to CN202210451720.4A priority Critical patent/CN114876893B/en
Priority to AU2022456592A priority patent/AU2022456592A1/en
Priority to PCT/CN2022/099256 priority patent/WO2023206747A1/en
Publication of CN114876893A publication Critical patent/CN114876893A/en
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)

Abstract

The invention discloses a two-stage hydraulic speed regulating system and a hydraulic support, wherein the two-stage hydraulic speed regulating system comprises a hydraulic cylinder, a second reversing valve and a control system, the first reversing valve is connected with a first chamber, the first reversing valve can be switched among a first state, a second state and a third state, the second reversing valve can be switched among a fourth state and a fifth state, the control system is used for enabling the first reversing valve to be in the third state while the second reversing valve is in the fourth state, enabling the first reversing valve to be in the second state while the second reversing valve is in the fifth state, and enabling the first reversing valve to be in the first state while the second reversing valve is in the fourth state. The two-stage hydraulic speed regulating system provided by the embodiment of the invention has the advantages of high control precision and the like.

Description

Two-stage hydraulic speed regulating system and hydraulic support
Technical Field
The invention relates to the field of control systems of hydraulic supports, in particular to a two-stage hydraulic speed regulating system and a hydraulic support.
Background
The electrohydraulic control reversing valve is a control core component of an electrohydraulic control system, is a hydraulic reversing valve formed by combining an electromagnetic pilot valve and a main valve, utilizes high-pressure liquid in a liquid path of the electromagnetic pilot valve to push a main valve core to control the action of an executive component, and plays an important role in realizing comprehensive mechanized mining and unmanned mining of a coal mine as a key component of electrohydraulic control of a hydraulic support. In the related art, accurate control of the hydraulic support is difficult to realize so as to meet the requirements of mechanized and unmanned mining of the coal mine.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the invention provides a two-stage hydraulic speed regulating system so as to improve the control precision.
The embodiment of the invention also provides a hydraulic support so as to improve the control precision of the hydraulic support.
The two-stage hydraulic speed regulating system of the embodiment of the invention comprises:
the hydraulic cylinder is a differential hydraulic cylinder and is provided with a first chamber and a second chamber;
a first reversing valve connected with the first chamber, the first reversing valve being switchable between a first state, a second state and a third state, a first liquid return port of the first reversing valve in the first state being in communication with the first chamber, a portion of a first liquid inlet port of the first reversing valve in the second state being in communication with the first chamber, all of the first liquid inlet ports of the first reversing valve in the third state being in communication with the first chamber;
the second reversing valve is connected with the second chamber, the second reversing valve can be switched between a fourth state and a fifth state, a second liquid inlet of the second reversing valve in the fourth state is communicated with the second chamber, and a second liquid return port of the second reversing valve in the fifth state is communicated with the second chamber;
The control system is used for controlling the first reversing valve to be in the third state, the second reversing valve to be in the fourth state, the first reversing valve to be in the second state, the second reversing valve to be in the fifth state, and the first reversing valve to be in the first state, and the second reversing valve to be in the fourth state.
The two-stage hydraulic speed regulating system provided by the embodiment of the invention has the advantages of high control precision and the like.
In some embodiments, the two-stage hydraulic speed regulation system comprises a liquid inlet pipeline and a liquid return pipeline, the first reversing valve comprises a shell, the shell is provided with a first valve cavity, the first liquid inlet port, the first liquid return port, a first control port and a first working port which are communicated with the first valve cavity, the first working port is communicated with the first cavity, the first liquid inlet port is communicated with the liquid inlet pipeline, the first liquid return port is communicated with the liquid return pipeline, when the first reversing valve is in the first state, the first working port is disconnected from the first liquid return port, when the first reversing valve is in the second state, the first working port is communicated with a part of the first liquid inlet port, and when the first reversing valve is in the third state, the first working port is communicated with all of the first liquid inlet port.
In some embodiments, the first valve cavity is provided with a first sealing surface and a second sealing surface which are arranged at intervals along the axial direction of the shell, and the first reversing valve further comprises:
the liquid inlet valve core and the liquid return valve core are both movably arranged in the first valve cavity along the axial direction of the shell, the liquid inlet valve core is provided with a first pushing part and a second pushing part third sealing surface which are arranged along the axial direction of the shell, the liquid return valve core is provided with a third pushing part, a fourth pushing part and a fourth sealing surface which are arranged along the axial direction of the shell, the third pushing part is used for pushing the second pushing part along the axial direction of the shell, the second pushing part and the fourth pushing part are used for being pushed by control liquid entering by the first control port, the third sealing surface is used for being matched with the first sealing surface to control the on-off of the first working port and the first liquid return port, the fourth sealing surface is used for being matched with the second sealing surface to control the on-off of the first working port and the first liquid inlet, the second pushing part is positioned between the third pushing part and the third sealing surface along the axial direction of the shell, and the distance between the third pushing part and the third sealing surface is smaller than the first working port and the second sealing surface along the axial direction of the shell;
The shell is provided with a contact part, and two ends of the return spring respectively lean against the contact part and the first pushing part.
In some embodiments, the first liquid return port is located between the first liquid inlet port and the first control port in the axial direction of the housing, and the first liquid inlet port is located between the first working port and the first liquid return port in the axial direction of the housing.
In some embodiments, the sum of the projected areas of the second pushing portion and the fourth pushing portion along the axial direction of the housing is S1, the projected area of the second pushing portion along the axial direction of the housing is S2, and the ratio of S1 to S2 is 1.1-5.
In some embodiments, the second reversing valve has a second liquid inlet, a second liquid return port, a second control port, and a second working port, the second working port is in communication with the second chamber, the second liquid inlet is in communication with the liquid inlet line, the second liquid return port is in communication with the liquid return line, the second working port is in communication with the second liquid inlet when the second reversing valve is in the fourth state, and the second working port is in communication with the second liquid return port when the second reversing valve is in the fifth state.
In some embodiments, the control system comprises:
the first pilot valve is provided with a third working fluid inlet, a third working fluid outlet and a third inlet and outlet, the third working fluid inlet is used for allowing the first pilot fluid to enter, the third working fluid inlet is communicated with a liquid inlet pipeline, the third working fluid outlet is communicated with the liquid return pipeline, and the third inlet and outlet are communicated with the first control port;
the second pilot valve is provided with a fourth working fluid inlet, a fourth working fluid outlet and a fourth inlet and outlet, the fourth working fluid inlet is used for allowing the second pilot fluid to enter, the fourth working fluid inlet is communicated with the liquid inlet pipeline, the fourth working fluid outlet is communicated with the liquid return pipeline, and the fourth inlet and outlet are communicated with the second control port.
In some embodiments, the control system further comprises:
the one-way overflow valve is provided with a first inlet and a first outlet, the third inlet and the first control port are communicated with the first inlet, and the fourth inlet and the second control port are communicated with the first outlet; and/or
The first one-way valve is arranged on the liquid inlet pipeline; and/or
The second one-way valve is arranged on the liquid return pipeline.
In some embodiments, a filter is also included, the filter being disposed on the liquid inlet line.
The hydraulic mount of an embodiment of the present invention is a two-stage hydraulic speed regulation system of any of the above embodiments.
Therefore, the hydraulic support has the advantages of high control precision and the like.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage hydraulic speed regulation system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a two-stage hydraulic speed regulation system according to an embodiment of the present invention when a first reversing valve is in a first state.
Fig. 3 is a schematic structural diagram of the two-stage hydraulic speed regulation system according to the embodiment of the present invention when the first reversing valve is in the second state.
Fig. 4 is a schematic structural diagram of the two-stage hydraulic speed regulation system according to the embodiment of the present invention when the first reversing valve is in the third state.
Reference numerals:
a two-stage hydraulic speed regulation system 100;
a hydraulic cylinder 1; a cylinder 101; a piston 102; a piston rod 103; a first chamber 104; a second chamber 105;
a first reversing valve 2; a first liquid inlet 201; a first liquid return port 202; a first control port 203; a first work port 204; a housing 205; a contact portion 2051; a first valve chamber 2052; a first sealing surface 2053; a second sealing surface 2054; a housing body 2055; a press ring 2056; end cap 2057; a fluid inlet valve core 206; a first pushing portion 2061; a second urging portion 2062; fourth sealing surface 2063; a mating segment 2064; a third end face 2065; a return spool 207; a third pushing portion 2071; a fourth urging portion 2072; a third sealing surface 2073; a macroporous segment 2074; a small hole segment 2075; a first end 2076; a second end face 2077; a return spring 208;
A second reversing valve 3; a second liquid inlet 301; a second liquid return port 302; a second control port 303; a second work port 304;
a first pilot valve 4; a third working fluid inlet 401; a third working fluid outlet 402; a third port 403;
a second pilot valve 5; a fourth working fluid inlet 501; a fourth working fluid outlet 502; a fourth inlet/outlet 503;
a one-way overflow valve 6; a first inlet 601; a first outlet 602;
a control system 7;
a first check valve 801; a second one-way valve 802;
the filter 9 is provided with a filter element,
a liquid feed line 1001; a return line 1002.
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 by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The technical scheme of the present application is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, a two-stage hydraulic speed regulation system 100 of an embodiment of the present invention includes a hydraulic cylinder 1, a first directional valve 2, a second directional valve 3, and a control system 7.
The hydraulic cylinder 1 is a differential hydraulic cylinder, the hydraulic cylinder 1 having a first chamber 104 and a second chamber 105.
The first reversing valve 2 is connected with the first chamber 104, the first reversing valve 2 is switchable among a first state, a second state and a third state, the first liquid inlet 201 of the first reversing valve 2 in the first state is disconnected from the first chamber 104, the first liquid inlet 201 of the first reversing valve 2 in the second state is partially communicated with the first chamber 104, and the first liquid inlet 201 of the first reversing valve 2 in the third state is fully communicated with the first chamber 104.
The second reversing valve 3 is connected to the second chamber 105, the second reversing valve 3 is switchable between a fourth state and a fifth state, the second liquid inlet 301 of the second reversing valve 3 in the fourth state is in communication with the second chamber 105, and the second liquid return 302 of the second reversing valve 3 in the fifth state is in communication with the second chamber 105.
The control system 7 is used for controlling the first reversing valve 2 to be in the third state, the second reversing valve 3 to be in the fourth state, the first reversing valve 2 to be in the second state, the second reversing valve 3 to be in the fifth state, and the first reversing valve 2 to be in the first state, and the second reversing valve 3 to be in the fourth state.
As shown in fig. 1, the hydraulic cylinder 1 includes a cylinder tube 101, a piston 102, and a piston rod 103, the piston 102 dividing the cylinder tube 101 into a first chamber 104 and a second chamber 105. The piston rod 103 is disposed in a second chamber 105 and is connected to the piston 102, the first chamber 104 being a rodless chamber and the second chamber 105 being a rod chamber.
The first fluid return port 202 being disconnected from the first chamber 104 may be understood as the first fluid return port 202 being opened, and at this time, the first working fluid may flow out of the first chamber 104 through the first fluid return port 202. The first liquid inlet 201 is partially communicated with the first chamber 104, which is understood that the opening area of the first liquid inlet 201 is smaller than the area of the first liquid inlet 201, and at this time, the first working liquid may enter the first chamber 104 through the first liquid inlet 201 at a small flow rate. All the first liquid inlet 201 is communicated with the first chamber 104, which is understood that the opening area of the first liquid inlet 201 is the area of the first liquid inlet 201, and at this time, the first working liquid can enter the first chamber 104 through the first liquid inlet 201 at a large flow rate. Wherein the first working fluid is working fluid flowing into and out of the first chamber 104.
The second liquid inlet 301 is communicated with the second chamber 105, which is understood to mean that the second liquid inlet 301 is opened, and at this time, the second working liquid may enter the second chamber 105 through the second liquid inlet 301. The second fluid return port 302 is in communication with the second chamber 105, which is understood to mean that the second fluid return port 303 is opened, and the second working fluid may flow out of the second chamber 105 through the second fluid return port 303. Wherein the second working fluid is working fluid that enters and exits the second chamber 105.
When the two-stage hydraulic speed regulation system 100 according to the embodiment of the present invention is used, the first liquid inlet 201 and the second liquid inlet 301 may use the same pressure working liquid, i.e. the first working liquid and the second working liquid have the same pressure, for example, the first working liquid and the second working liquid are the same working liquid. The control system 7 controls the first reversing valve 2 and the second reversing valve 3 to be in different states, so that the two-stage hydraulic speed regulating system 100 can have the following three different working states:
in the first working state, the control system 7 controls the first reversing valve 2 to be in the third state and controls the second reversing valve 3 to be in the fourth state. At this time, the first working fluid enters the first chamber 104 through the first fluid inlet 201 at a large flow rate, the second working fluid can enter the second chamber 105 through the second fluid inlet 301, so that the working fluid with the same pressure enters the first chamber 104 and the second chamber 105, and the piston rod 103 is arranged in the second chamber 105, so that the stress area of the piston 102 in the first chamber 104 is larger than the stress area of the piston 102 in the second chamber 105, and the hydraulic cylinder 1 is a differential hydraulic cylinder. Since p=f/S (pressure=pressure/force receiving area) such that the thrust force of the working fluid in the first chamber 104 to the piston 102 is larger than the thrust force of the working fluid in the second chamber 105 to the piston 102, the piston 102 is moved toward the second chamber 105 by differential action, and the piston rod 103 is differentially extended.
In the second working state, the control system 7 controls the first reversing valve 2 to be in the second state and controls the second reversing valve 3 to be in the fifth state. At this time, the first working fluid enters the first chamber 104 through the first fluid inlet 201 at a small flow rate, and the second working fluid can flow out of the second chamber 105 through the second fluid return port 302, so that the working fluid in the first chamber 104 applies a thrust force to the piston 102 towards the second chamber 105, the piston 102 slowly moves towards the second chamber 105 under the action of the thrust force, and the piston rod 103 slowly extends out.
In the third working state, the control system 7 controls the first reversing valve 2 to be in the first state and controls the second reversing valve 3 to be in the fourth state. At this time, the first working fluid may flow out of the first chamber 104 through the first fluid return port 202, and the second working fluid may enter the second chamber 105 through the second fluid inlet 301, so that the working fluid in the second chamber 105 applies a thrust force to the piston 102 toward the first chamber 104, the piston 102 moves toward the first chamber 104 under the thrust force, and the piston rod 103 is retracted.
Therefore, the two-stage hydraulic speed regulating system 100 of the embodiment of the invention can realize three working states of differential extension, slow extension and retraction by controlling the first reversing valve 2 and the second reversing valve 3 to be in different states, thereby being beneficial to improving the control precision of the two-stage hydraulic speed regulating system 100 of the embodiment of the invention. In specific implementation, by reasonably designing the flow of the first reversing valve 1 in the second state, the differential extending moving speed of the hydraulic cylinder 1 can be larger than the slow extending moving speed, so that the control precision of the hydraulic bracket with the two-stage hydraulic speed regulating system 100 can be improved.
Therefore, the two-stage hydraulic speed regulation system 100 of the embodiment of the invention has the advantages of high control precision and the like.
In some embodiments, the two-stage hydraulic speed regulation system 100 includes a feed line 1001 and a return line 1002, and the first reversing valve 2 includes a housing 205, a feed spool 206, a return spool 207, and a return spring 208.
The housing 205 has a first valve chamber 2052, a first fluid inlet 201, a first fluid return 202, a first control port 203, and a first working port 204 in communication with the first valve chamber 2052. The first working port 204 communicates with the first chamber 104, the first inlet port 201 communicates with the inlet line 1001, and the first return port 202 communicates with the return line 1002. When the first reversing valve 2 is in the first state, the first working port 204 is disconnected from the first liquid inlet 201; when the first reversing valve 2 is in the second state, the first working port 204 is partially communicated with the first liquid inlet 201; when the first reversing valve 2 is in the third state, the first working port 204 is all communicated with the first liquid inlet 201.
As shown in fig. 2, the first working port 204 is communicated with the first liquid return port 202, it is understood that the first liquid return port 202 is opened, the first chamber 104 is communicated with the first liquid return port 202 through the first working port 204, and the first working liquid in the first chamber 104 flows out through the first liquid return port 202. As shown in fig. 3, the first working port 204 is partially communicated with the first liquid inlet 201, and it is understood that the opening area of the first liquid inlet 201 is smaller than the area of the first liquid inlet 201, and at this time, the first working liquid can enter the first working port 204 with a small flow. It is understood that the first working port 204 is fully communicated with the first liquid inlet 201, and as shown in fig. 4, the opening area of the first liquid inlet 201 is the area of the first liquid inlet 201, and at this time, the first working liquid can enter the first working port 204 in a large flow.
The above design of the first reversing valve 2 facilitates the on-off of the first reversing valve 2 with the liquid inlet pipeline 1001 and the liquid return pipeline 1002.
In some embodiments, a first sealing surface 2053 and a second sealing surface 2054 are disposed in the first valve cavity 2052 at intervals along the axial direction of the housing 205, the first reversing valve 2 further includes a feed spool 206 and a return spool 207 both movably disposed in the first valve cavity 2052 along the axial direction of the housing 205, the feed spool 206 having a first pushing portion 2061, a second pushing portion 2062, and a third sealing surface 2073 disposed along the axial direction of the housing 205, and the return spool 207 having a third pushing portion 2071, a fourth pushing portion 2072, and a fourth sealing surface 2063 disposed along the axial direction of the housing 205. The third pushing portion 2071 is for pushing the second pushing portion 2062 in the axial direction of the housing 205, and the second pushing portion 2062 and the fourth pushing portion 2072 are for being pushed by the control liquid introduced from the first control port 203. The third sealing surface 2073 is used for being matched with the first sealing surface 2053 to control the on-off of the first working port 204 and the first liquid return port 202, the fourth sealing surface 2063 is used for being matched with the second sealing surface 2054 to control the on-off of the first working port 204 and the first liquid inlet port 201, the second pushing part 2062 is axially positioned between the third pushing part 2071 and the third sealing surface 2073 in the shell 205, and the distance between the third pushing part 2071 and the third sealing surface 2073 along the axial direction of the shell 205 is smaller than or equal to the distance between the second pushing part 2062 and the first sealing surface 2053 along the axial direction of the shell 205 when the first working port 204 is disconnected from the first liquid inlet port 201.
In order to make the technical solution of the present application easier to understand, the technical solution of the present application will be further described below by taking an example in which the axial direction of the housing 205 coincides with the left-right direction, where the left-right direction is shown in fig. 2 to 4.
For example, as shown in fig. 2 to 4, the first working port 204, the first liquid inlet port 201, the first liquid return port 202, and the first control port 203 are arranged in this order from left to right, the fourth sealing surface 2063, the second sealing surface 2054, the first sealing surface 2053, and the third sealing surface 2073 are arranged in this order from left to right, and the first sealing surface 2053 and the second sealing surface 2054 are both located between the first liquid inlet port 201 and the first liquid return port 202. The liquid inlet valve core 206 is located on the left side of the shell 205, the liquid return valve core 207 is located on the right side of the shell 205, the contact portion 2051 is located on the left side of the first pushing portion 2061, the first pushing portion 2061 is located on the left side of the second pushing portion 2062, the return spring 208 is sleeved on the liquid inlet valve core 206, the left end of the return spring 208 abuts against the contact portion 2051, the right end of the return spring 208 abuts against the first pushing portion 2061, and the return spring 208 drives the liquid inlet valve core 206 to move rightward. The third pushing portion 2071 is located at the left side of the fourth pushing portion 2072, the third pushing portion 2071 is located at the right side of the third sealing surface 2073, and the second pushing portion 2062 is located between the third pushing portion 2071 and the third sealing surface 2073. The control liquid entering the first control port 203 pushes the second pushing portion 2062 and the fourth pushing portion 2072 leftward.
It will be appreciated that the first inlet port 201 is disconnected from the first working port 204 when the second sealing surface 2054 abuts the fourth sealing surface 2063, and the first return port 202 is disconnected from the first working port 204 when the third sealing surface 2073 abuts the first sealing surface 2053.
When the control hydraulic pressure of the first control port 203 is the first preset pressure, the control liquid cannot push the fourth pushing portion 2072 and the second pushing portion 2062 to move leftwards simultaneously, so that the second sealing surface 2054 and the fourth sealing surface 2063 are separated, at this time, the first working port 204 and the first liquid inlet 201 are disconnected, the first liquid inlet 201 is closed, and the first reversing valve 2 is in the first state, i.e., the first liquid inlet 201 is a zero-flow liquid inlet (as shown in fig. 2). At this time, the first sealing surface 2053 and the third sealing surface 2073 are separated, and the first working port 204 communicates with the first return port 202.
When the control hydraulic pressure of the first control port 203 is the second preset pressure and the second preset pressure is greater than the first preset pressure, the liquid inlet valve 206 of the second pushing portion 2062 cannot move leftwards only by pushing the control liquid, i.e. the opening of the first liquid inlet 201 cannot be realized. Because the distance between the third pushing portion 2071 and the third sealing surface 2073 along the axial direction of the housing 205 is less than or equal to the distance between the second pushing portion 2062 and the first sealing surface 2053 along the axial direction of the housing 205 when the first working port 204 is disconnected from the first liquid inlet 201, when the third sealing surface 2073 abuts against the first sealing surface 2053, the second sealing surface 2054 is separated from the fourth sealing surface 2063, and at this time, the first liquid inlet 201 can be partially opened to realize a small flow of liquid, that is, the first reversing valve 2 is in the second state (as shown in fig. 3);
When the control hydraulic pressure of the first control port 203 is the third preset pressure and the third preset pressure is greater than the second preset pressure, the opening of the first liquid inlet 201 may be achieved only by pushing the second pushing portion 2062 with the control liquid. It will be appreciated that when the third sealing surface 2073 abuts against the first sealing surface 2053, the third pushing portion 2071 cannot move leftwards together with the second pushing portion 2062, but because the third preset pressure is greater than the second preset pressure, the second pushing portion 2062 can move leftwards under the separate pushing action of the control liquid, at this time, the second pushing portion 2062 is separated from the third pushing portion 2071, and the control liquid pushes the second pushing portion 2062 leftwards until the first liquid inlet 201 is fully opened, so as to realize full-flow liquid feeding, i.e., the first reversing valve 2 is in the third state (as shown in fig. 4).
Therefore, in the first reversing valve 2 of the two-stage hydraulic speed regulation system 100 according to the embodiment of the present invention, the distance between the third pushing portion 2071 and the third sealing surface 2073 along the axial direction of the housing 205 is smaller than or equal to the distance between the second pushing portion 2062 and the first sealing surface 2053 along the axial direction of the housing 205 when the first working port 204 is disconnected from the first liquid inlet 201. The third pushing part 2071 on the liquid return valve core 207 can push the second pushing part 2062 on the propelling liquid valve core 206, and control the first control port 203 to enter the control liquid with different pressures to control the opening area of the first liquid inlet 201, so that the zero flow, the small flow and the full flow of the liquid inlet 201 of the first liquid inlet 201 are realized, and the flow adjustment of the first reversing valve 2 is more convenient.
In some embodiments, the sum of the projected areas of the second pushing portion 2062 and the fourth pushing portion 2072 along the axial direction of the housing 205 is S1, the projected area of the second pushing portion 2062 along the axial direction of the housing 205 is S2, and the ratio of S1 to S2 is 1.1-5.
It is to be understood that, when the control hydraulic pressure of the first control port 203 is the third preset pressure, the second pushing portion 2062 may move leftward under the sole pushing action of the control liquid; when the control hydraulic pressure of the first control port 203 is the second preset pressure, the second pushing portion 2062 is pushed only by the control liquid to move the liquid inlet valve 206 leftward because the second preset pressure is smaller than the third preset pressure. p=f/S (pressure=pressure/force area), although the second preset pressure is smaller than the third preset pressure, the ratio of S1 to S2 is 1.1-5 (for example, the ratio of S1 to S2 is 2), that is, the second pushing portion 2062 and the third pushing portion 2071 have a larger force-bearing area together, so that the second pushing portion 2062 receives a larger pushing force under the combined action of the pushing of the control liquid and the pushing of the third pushing portion 2071, so that the second pushing portion 2062 moves leftwards, so that the first liquid inlet 201 can be partially opened, and a small flow of liquid is achieved (as shown in fig. 2).
By reasonably setting the ratio of S1 to S2, the second pushing part 2062 can effectively ensure that the liquid inlet valve core 206 can be driven to move leftwards under the leftward dual pushing action of the third pushing part 2071 and the control liquid, so that the small-flow liquid inlet of the first liquid inlet 201 is realized, and the overall structural design of the liquid return valve core 207 is reasonable.
The first reversing valve 2 of the two-stage hydraulic speed regulation system 100 of the embodiment of the present invention, when in use:
the pressure P of the first working fluid connected to the first fluid inlet 201 0 Pressure P of third working fluid connected to first fluid return port 202 R The pressure of the control liquid connected to the first control port 203 is P K . Let the control hydraulic pressure of the first control port 203 be P K1 When (the second preset pressure), the liquid return valve core 207 just moves leftwards under the pushing action of the control liquid, and the control liquid pressure of the first control port 203 is assumed to be P K2 When the pressure is the third preset pressure, the liquid inlet valve core 206 just moves leftwards under the pushing action of the control liquid until the first liquid inlet 201 is fully opened, i.e. the opening area of the first liquid inlet 201 is the total area of the first liquid inlet 201, wherein P is more than or equal to 0 R ＜P K1 ＜P K2 ≤P 0 。
When P K ＜P R When the fourth sealing surface 2063 abuts against the second sealing surface 2054 under the combined action of the return spring 208 and the working fluid pressure of the first working port as shown in fig. 2, the first working port 204 and the first inlet port 201 are disconnected, and the opening area of the first inlet port 201 is zero, i.e., the first working fluid of the first inlet port 201 enters the first working port 204 at zero flow rate.
When P K1 ＜P K ＜P K2 As shown in FIG. 3, because of P K ＜P K2 The second pushing portion 2062 cannot independently drive the inlet valve core 206 to move leftwards under the pushing action of the control liquid until the first inlet 201 is opened at full flow. Although P K ＜P K2 However, the total force-bearing area of the second pushing portion 2062 and the fourth pushing portion 2072 is larger, when the fourth pushing portion 2072 pushes the control liquid leftwards, the liquid return valve core 207 has larger leftward pushing force, so that the second pushing portion 2062 can push the liquid inlet valve core 206 leftwards under the double pushing action of the third pushing portion 2071 and the control liquid, the third sealing surface 2073 abuts against the first sealing surface 2053, the fourth sealing surface 2063 is separated from the second sealing surface 2054, and the opening area of the first liquid inlet 201 is smaller than the area of the first liquid inlet 201, that is, the first working liquid of the first liquid inlet 201 flows through the first working opening 204 at a small flow rate.
When P K2 ＜P K When the third sealing surface 2073 abuts against the first sealing surface 2053, the second pushing portion 2062 is separated from the third pushing portion 2071, and the second pushing portion 2062 causes the fourth sealing surface 2063 to be separated from the second sealing surface 2053 only by the single pushing action of the control liquid as shown in fig. 4The sealing surface 2054 separates, so that the inlet valve core 206 moves leftwards until the opening area of the first inlet 201 is the total area of the first inlet 201, that is, the first working fluid of the first inlet 201 flows through the first working port 204 at full flow rate.
In some embodiments, the first return port 202 is located between the first inlet port 201 and the first control port 203 in the axial direction of the housing 205, and the first inlet port 201 is located between the first working port 204 and the first return port 202 in the axial direction of the housing 205.
Alternatively, the third sealing surface 2073 is away from the first sealing surface 2053 and the fourth sealing surface 2063 abuts against the second sealing surface 2054 when the first directional valve 2 is in the first state and the second state, the third sealing surface 2073 abuts against the first sealing surface 2053 and the fourth sealing surface 2063 is away from the second sealing surface 2054 when the first directional valve 2 is in the third state.
As shown in fig. 2 to 4, when the first reversing valve 2 is in the first state (shown in fig. 2), the fourth sealing surface 2063 and the second sealing surface 2054 are in close contact, the first intake port 201 is disconnected from the first working port 204, the first sealing surface 2053 and the third sealing surface 2073 are separated, and the first working port 204 communicates with the first return port 202.
When the first reversing valve 2 is in the second state (shown in fig. 3) and the third state (shown in fig. 4), the first sealing surface 2053 and the third sealing surface 2073 are in close contact, the first working port 204 is disconnected from the first return port 202, the fourth sealing surface 2063 and the second sealing surface 2054 are separated, and the first liquid inlet 201 communicates with the first working port 204.
Thus, by providing the first sealing surface 2053 and the third sealing surface 2073, the liquid return spool 207 is facilitated to control the on/off of the first liquid return port 202 and the first working port 204; by providing the second sealing surface 2054 and the fourth sealing surface 2063, the convenient liquid inlet valve core 2062 controls the on-off of the first liquid inlet 201 and the first working port 204, so that the flow of the first reversing valve 2 is convenient to adjust, and the two-stage hydraulic speed regulating system 100 in the embodiment of the invention is convenient to adjust.
Alternatively, the liquid return spool 207 includes a large hole section 2074 and a small hole section 2075 provided in the axial direction of the housing 205, the large hole section 2074 having an inner diameter larger than that of the small hole section 2075, the large hole section 2074 being provided in the axial direction of the housing 205 closer to the first liquid inlet 201 than the small hole section 2075, the small hole section 2075 having a first end face 2076 and a second end face 2077 opposed in the axial direction of the housing 205, the first end face 2076 being provided in the axial direction of the housing 205 closer to the first liquid inlet 201 than the second end face 2077, the first end face 2076 forming a third urging portion 2071, the second end face 20772 forming a fourth urging portion 2072.
For example, as shown in fig. 1 to 3, the small hole section 2075 is located on the right side of the large hole section 2074, the first end face 2076 is located on the left side of the second end face 2077, the holes of the small hole section 2075 and the large hole section 2074 are both disposed in the left-right direction, and the holes of the small hole section 2075 are disposed coaxially with the holes of the large hole section 2074, and the control liquid entering through the first control port 203 enters the holes of the large hole section 2074 through the holes of the small hole section 2075 and contacts the second pushing portion 2062 to push the second pushing portion 2062.
Specifically, when the first reversing valve 2 is in the second state (as shown in fig. 3), i.e., P K1 ＜P K ＜P K2 When the control liquid pushes the fourth pushing part 2072 leftwards, the liquid return valve core 207 moves leftwards, when the liquid return valve core 207 moves to the contact of the third pushing part 2071 and the second pushing part 2062, the third pushing part 2071 and the control liquid push the second pushing part 2062 leftwards at the same time, the liquid inlet valve core 206 is driven to move leftwards, when the liquid inlet valve core 206 moves to the contact of the third sealing surface 2073 of the liquid return valve core 207 and the first sealing surface 2053, the liquid return valve core 207 can not move leftwards any more, and because of P K ＜P K2， The liquid inlet valve core 206 can not move leftwards only under the action of the control liquid pushing second pushing portion 2062, at this time, the opening area of the first liquid inlet 201 is smaller than the area of the first liquid inlet 201, that is, the first working liquid of the first liquid inlet 201 enters the first working opening 204 through the small flow of the part of the opening area of the first liquid inlet 201.
When the first reversing valve 2 is in the third state, i.e. P K2 ＜P K When (as shown in FIG. 4), the control liquid enters the large hole part 2074 from the small hole part 2075 to the second pushing part 2062, due to P K2 ＜P K The control fluid pressure is larger, the fluid inlet valve core 206 can move leftwards only under the single pushing action of the control fluid, and at the moment, the first valve core The opening area of the liquid inlet 201 is the area of the first liquid inlet 201, that is, the first working liquid full flow of the first liquid inlet 201 enters the first working opening 204.
Therefore, by arranging the liquid return valve core 207 into the large hole section 2074 and the small hole section 2075, and forming the first end surface 2076 into the third pushing part 2071 and the second end surface 2077 into the fourth pushing part 2072, not only is the third pushing part 2071 convenient to push the second pushing part 2062, but also the control liquid is convenient to push the second pushing part 2062 and the fourth pushing part 2072, so that the first reversing valve 2 is simple in structure, and the two-stage hydraulic speed regulating system 100 of the embodiment of the invention is simple in structure.
Optionally, a first mounting groove is provided on the outer peripheral wall of the liquid return spool 207, and a first sealing ring is installed in the first mounting groove, and the first sealing ring is used for sealing a gap between the outer wall surface of the liquid return spool 207 and the inner wall surface of the housing 205, so as to improve the tightness of the first reversing valve 2.
Optionally, the fluid inlet valve core 206 includes a mating segment 2064, the macroporous segment 2074 is sleeved on the mating segment 2064, and an inner peripheral surface of the macroporous segment 2074 is in sealing fit with an outer peripheral surface of the mating segment 2064, the mating segment 2064 has a third end surface 2065 facing the third pushing portion 2071, the third end surface 2065 forms a second pushing portion 2062, and a distance between the first end surface 2076 and the third sealing surface 2073 along an axial direction of the housing 205 is less than or equal to a distance between the third end surface 2065 and the first sealing surface 2053 along the axial direction of the housing 205.
Thus, the third pushing portion 2071 is formed by the third end surface 2065 of the fitting section 2064, thereby further simplifying and compacting the structure of the first reversing valve 2.
Optionally, a second mounting groove is provided on the outer peripheral wall of the mating section 2064, and a second sealing ring is installed in the second mounting groove, and the second sealing ring is used for sealing a gap between the outer wall surface of the mating section 2064 and the inner wall surface of the macroporous section 2074 so as to improve the tightness of the first reversing valve 2.
Alternatively, the first end face 2076, the second end face 2077, and the third end face 2065 of the present embodiment are all planes perpendicular to the axial direction of the housing 205, and the difference in area of the third end face 2065 from the area of the first end face 2076 is less than the area of the second end face 2077.
By making the first end surface 2076, the second end surface 2077 and the third end surface 2065 be planes perpendicular to the axial direction of the housing 205, the inlet valve core 206 and the return valve core 207 have simple structures, and the inlet valve core 206 and the return valve core 207 can be conveniently manufactured, so that the first reversing valve 2 can be conveniently manufactured.
In some embodiments, the projected area of the first pushing portion 2061 in the axial direction of the housing is smaller than the projected area of the second pushing portion 202 in the axial direction of the housing 1.
As shown in fig. 1, the first working fluid in the first fluid inlet 201 may push the first pushing portion 2061 to the right, and by making the projection area of the first pushing portion 2061 along the axial direction of the housing 205 smaller than the projection area of the second pushing portion 2062 along the axial direction of the housing 205, the second pushing portion 2062 may have a larger leftward pushing force when the first reversing valve 2 is in the third state, so as to overcome the elasticity of the rightward return spring 208 and the rightward pushing force of the first working fluid on the first pushing portion 2061, thereby making the fluid inlet valve 206 simple in structure.
Optionally, the housing 205 includes a housing body 2055, a compression ring 2056, and an end cap 2057. The housing body 2055 is a cylinder with two open ends in the axial direction, and the first liquid inlet 201, the first liquid return port 202 and the first control port 203 are all disposed on the housing body 2055. The press ring 2056 is provided at one end of the housing main body 2055, the inner hole of the press ring 2056 forms the first working port 204, and the press ring 2056 forms the contact portion 2051. An end cap 2057 seals against the other end of the housing body 2055.
As shown in fig. 2 to 4, the pressure ring 2056 is disposed at the left end of the housing body 2055, the outer wall surface of the pressure ring 2056 is connected to the inner wall surface of the housing body 2055, the pressure ring 2056 is sleeved on the liquid inlet valve core 206, the liquid inlet valve core 206 can slide in the left-right direction relative to the pressure ring 2056, the right end surface of the pressure ring 2056 forms a contact portion 2051, and the end cover 2057 seals the right end of the housing body 2055.
When the first reversing valve 2 is assembled, the liquid inlet valve core 206, the liquid return valve core 207 and the return spring 208 can be firstly arranged in the first valve cavity 2052 of the housing 205, then the left port of the housing body 2055 is sealed by the pressure ring 2056, the right port of the housing body 2055 is sealed by the end cover 2057, and the assembly of the first reversing valve 2 is facilitated while the tightness of the first reversing valve 2 is improved.
Optionally, a pressure ring 2056 is removably coupled to the housing body 2055.
For example, the press ring 2056 is in threaded connection with the housing body 2055, an external thread is arranged on the outer wall surface of the press ring 2056, an internal thread matched with the external thread on the press ring 2056 is arranged on the inner wall surface of the housing body 2055, and the press ring 2056 is screwed so as to realize convenient installation of the press ring 2056.
Optionally, a third mounting groove is formed on the inner wall surface of the pressure ring 2056, and a third sealing ring is installed in the third mounting groove, and is used for sealing a gap between the inner wall surface of the pressure ring 2056 and the outer wall surface of the liquid inlet valve core 2062.
Optionally, an end cap 2057 is removably coupled to the housing body 2055.
For example, the end cover 2057 is in threaded connection with the housing body 2055, an external thread is provided on an outer wall surface of the end cover 2057, an internal thread matched with the external thread on the end cover 2057 is provided on an inner wall surface of the housing body 2055, and the end cover 2057 is installed by screwing the end cover 2057, so that the end cover 2057 is convenient to install.
Optionally, the housing body 2055 is a unitary structure.
Optionally, each of the first liquid inlet 201, the first liquid return port 202 and the first control port 203 is plural, the plural first liquid inlet 201 are uniformly spaced along the circumference of the housing body 2055, the plural first liquid return port 202 are uniformly spaced along the circumference of the housing body 2055, and the plural first control port 203 are uniformly spaced along the circumference of the housing body 2055. Each of the plurality of first fluid inlets 201 is in communication with a fluid inlet line 1001 and each of the plurality of first fluid return inlets 202 is in communication with a fluid return line 1002.
In some embodiments, the second reversing valve 3 has a second inlet 301, a second return 302, a second control 303, and a second working port 304, the second working port 304 is in communication with the second chamber 105, the second inlet 301 is in communication with the inlet line 1001, the second return 302 is in communication with the return 1002, the second working port 304 is in communication with the second inlet 301 when the second reversing valve 3 is in the fourth state, and the second working port 304 is in communication with the second return 302 when the second reversing valve 3 is in the fifth state.
When the second reversing valve 3 is in the fourth state, the second working port 304 is communicated with the second liquid inlet 301, and at this time, the second working liquid can flow into the second chamber 105 through the second liquid inlet 301 and the second working port 304; when the second reversing valve 3 is in the fifth state, the second working port 304 is in communication with the second liquid return port 302, and at this time, the second working liquid in the second chamber 105 may flow out through the second working port 304 and the second liquid return port 302.
By providing the second liquid inlet 301, the second liquid return port 302, the second control port 303 and the second working port 304, the communication between the second reversing valve 3 and the liquid inlet pipeline 1001 and the liquid return pipeline 1002 is conveniently realized.
In some embodiments, as shown in fig. 1, the control system 7 includes a first pilot valve 4 and a second pilot valve 5. The first pilot valve 4 has a third working fluid inlet 401, a third working fluid outlet 402, and a third inlet/outlet 403, the third working fluid inlet 401 is for the first pilot fluid to enter, the third working fluid inlet 401 is communicated with the fluid inlet line 1001, the third working fluid outlet 402 is communicated with the fluid return line 1002, and the third inlet/outlet 403 is communicated with the first control port 203. The second pilot valve 5 has a fourth working fluid inlet 501, a fourth working fluid outlet 502, and a fourth inlet/outlet 503, the fourth working fluid inlet 501 is for the second pilot fluid to enter, the fourth working fluid inlet 501 is in communication with the fluid inlet line 1001, the fourth working fluid outlet 502 is in communication with the fluid return line 1002, and the fourth inlet/outlet 503 is in communication with the second control port 303.
Specifically, when the first pilot valve 4 is opened, the third working fluid inlet 401 is communicated with the third inlet and outlet 403, at this time, the first pilot fluid may enter the first pilot valve 4 through the third working fluid inlet 401 and flow into the first control port 203 of the first reversing valve 2 through the third inlet and outlet 403 to control the first reversing valve 2 to switch between the second state and the third state; when the first pilot valve 4 is closed, the third working fluid outlet 402 is communicated with the third inlet and outlet 403, at this time, the third working fluid inlet 401 is disconnected from the third inlet and outlet 403, the third inlet and outlet 403 is communicated with the third working fluid outlet 402, and the control fluid in the first control port 203 flows into the first pilot valve 4 through the third working fluid outlet 402 and flows out through the third working fluid outlet 402, so that the first reversing valve 2 is in the first state. The first pilot fluid is a pilot fluid flowing in and out of the first pilot valve 4.
When the second pilot valve 5 is opened, the fourth working fluid inlet 501 is communicated with the fourth inlet 503, at this time, the second pilot fluid can enter the second pilot valve 5 through the fourth working fluid inlet 501 and flow into the second control port 303 of the second reversing valve 3 through the fourth inlet 503 to control the second reversing valve 3 to be in a fourth state; when the second pilot valve 5 is closed, the fourth working fluid inlet 501 is disconnected from the fourth inlet 503, the fourth inlet 503 is communicated with the fourth working fluid outlet 502, and the control fluid in the second control port 303 of the second reversing valve 3 flows into the second pilot valve 5 through the fourth working fluid outlet 502 and flows out through the fourth working fluid outlet 502 to control the second reversing valve 3 to be in the fifth state. The second pilot liquid is the pilot liquid entering and exiting the second pilot valve 5.
Therefore, the control of the first reversing valve 2 in the first state, the second state and the third state is conveniently realized by arranging the first pilot valve 4; by arranging the second pilot valve 5, the control of the second reversing valve 3 in the fourth state and the fifth state is conveniently realized, so that the two-stage hydraulic speed regulating system 100 provided by the embodiment of the invention has a simple structure and is more convenient to regulate and control.
Alternatively, each of the first pilot valve 4 and the second pilot valve 5 is an electromagnetic pilot valve, and the control system 7 is electrically connected with each of the first pilot valve 4 and the second pilot valve 5.
In some embodiments, the control system 7 further includes a relief check valve 6, the relief check valve 6 having a first inlet 601 and a first outlet 602, the third inlet 403 and the first control port 203 each communicating with the first inlet 601, and the fourth inlet 503 and the second control port 303 each communicating with the first outlet 602.
For example, as shown in fig. 1, when the two-stage hydraulic speed regulation system 100 according to the embodiment of the present invention is in use, the pressure of the working fluid in the fluid inlet pipeline 1001 is P 0 The pressure of the working fluid in the return line 1002 is P R ，
When the two-stage hydraulic speed regulation system 100100 according to the embodiment of the invention needs to be in the first working state (the hydraulic cylinder 1 is differentially extended), the first pilot valve 4 and the second pilot valve 5 are simultaneously opened, the first pilot liquid enters the first control port 203 through the first pilot valve 4, and the second pilot liquid enters the second control port 303 through the second pilot valve 5. Since the first inlet 601 of the one-way overflow valve 6 is communicated with the third inlet 403 and the first control port 203, and the first outlet 602 is communicated with the fourth inlet 503 and the second control port 303, the pressures of the first pilot liquid and the second pilot liquid at the two ends of the first inlet 601 and the first outlet 602 of the one-way overflow valve 6 are the same, and are P 0 So that the first reversing valve 2 is in the third state and the second reversing valve 3 is in the fourth state, and the piston rod 103 is differentially extended.
When the two-stage hydraulic speed regulating system 100100 of the embodiment of the invention needs to be in the second working state (the hydraulic cylinder 1 slowly stretches out), the first pilot valve 4 is opened, the second pilot valve 5 is closed at the same time, after the first pilot liquid enters the first pilot valve 4 and flows out through the third inlet 403, a part of the first pilot liquid flows into the one-way overflow valve 6 through the first inlet 601 and flows out through the first outlet 602, and the other part of the first pilot liquid enters the first reversing valve 2 through the first control port 203 to form control liquid. The partial pressure of the first pilot fluid flowing into the first control port 203 is set to P by the partial pressure of the relief valve 6 k1 And P K2 In between, since the second pilot valve 5 is in the closed state, the first pilot liquid flowing out of the first outlet 602 flows into the second pilot valve 5 through the fourth inlet 503 and flows back into the liquid return pipeline 1002 through the fourth working liquid outlet, so that the first reversing valve 2 is in the second state and the second reversing valve 3 is in the fifth state, and the piston rod 103 slowly extends.
When the two-stage hydraulic speed regulating system 100100 of the embodiment of the invention needs to be in the third working state (the hydraulic cylinder 1 is retracted), the first pilot valve 4 is closed, the second pilot valve 5 is opened, the first pilot valve 4 is closed, the third inlet and outlet 403 is communicated with the third working fluid outlet 402, the control fluid of the first control port 203 flows back into the return fluid pipeline 1002, and the first reversing valve 2 is in the first state. After the second pilot valve 5 is opened, The second pilot fluid enters the second pilot valve 5 through the fourth working fluid inlet 501 and flows out through the fourth inlet 503, and the second pilot fluid flowing out of the fourth inlet 503 can not flow from the first outlet 602 of the one-way overflow valve 6 to the first inlet 601 of the one-way overflow valve 6, so that the second pilot fluid flowing out of the fourth inlet 503 is kept to be P 0 And enters the second control port 303 to control the second reversing valve 3 to be opened at full flow, the second reversing valve 3 is in a fourth state, and the piston rod 103 of the hydraulic cylinder 1 is retracted.
Therefore, by arranging the one-way overflow valve 6 between the first reversing valve 2 and the second reversing valve 3, the switching between the three working states of the two-stage hydraulic speed regulating system 100 can be realized by controlling the on-off of the first pilot valve 4 and the second pilot valve 5, so that the two-stage hydraulic speed regulating system provided by the embodiment of the invention is further simple in structure and convenient to control and regulate.
Optionally, the two-stage hydraulic speed regulation system 100 according to the embodiment of the present invention further includes a first check valve 801 and a second check valve 802, where the first check valve 801 is disposed on the liquid inlet pipeline 1001, and the second check valve 802 is disposed on the liquid return pipeline 1002.
As shown in fig. 1, the working fluid in the liquid inlet pipeline 1001 flows into the first pilot valve 4 and the second pilot valve 5 through the first check valve 801, so that the backflow of the pilot fluid in the first pilot valve 4 and the second pilot valve 5 into the liquid inlet pipeline 1001 can be effectively prevented, the pollution to the working fluid in the liquid inlet pipeline 1001 is caused, and the working reliability of the two-stage hydraulic speed regulating system 100 in the embodiment of the invention is improved.
The control liquid flowing out of the first pilot valve 4 and the second pilot valve 5 flows to the liquid return pipeline 1002 through the second check valve 802, so that the working liquid in the liquid return pipeline 1002 can be effectively prevented from flowing back into the first pilot valve 4 and the second pilot valve 5, and the working reliability of the two-stage hydraulic speed regulation system provided by the embodiment of the invention is further improved.
Optionally, the two-stage hydraulic speed regulation system 100 according to the embodiment of the present invention further includes a filter 9, where the filter 9 is disposed on the liquid inlet line 1001.
As shown in fig. 1, the working fluid flowing out of the first check valve 801 is filtered by the filter 9 and then enters the first pilot valve 4 and the second pilot valve 5 respectively, and the filter 9 is arranged to filter the working fluid in the liquid inlet pipeline 1001, so that impurities in the working fluid in the liquid inlet pipeline 1001 can be effectively prevented from blocking the first pilot valve 4 or the second pilot valve 5, and the working reliability of the two-stage hydraulic speed regulating system 100 in the embodiment of the invention is further improved.
Optionally, each of the first reversing valve 2, the second reversing valve 3, the first pilot valve 4, the second pilot valve 5, the one-way overflow valve 6, the first one-way valve 801, the second one-way valve 802 and the filter 9 is integrated with one module, so that the two-stage hydraulic speed regulating system 100 of the embodiment of the invention has compact structure and is convenient to disassemble and replace.
The hydraulic mount of the present embodiment includes a two-stage hydraulic speed regulation system 100.
For example, when the hydraulic support needs to extend 100cm for supporting, first, the first pilot valve 4 is opened, the second pilot valve 5 is closed, and the piston rod 103 of the hydraulic support is differentially extended by 90cm, so that the piston rod 103 of the hydraulic support can quickly reach the vicinity of the position needing supporting; then, the first pilot valve 4 is closed and the second pilot valve 5 is opened, so that the piston rod 103 of the hydraulic support slowly extends out by 10cm, and the piston rod 103 of the hydraulic support can accurately reach the position required to be supported. Therefore, the two-stage hydraulic speed regulating system 100 can be controlled to accurately control the hydraulic support, and the hydraulic support can be controlled quickly, accurately and reliably.
Therefore, the hydraulic support has the advantages of high control precision and the like.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., 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 invention. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.

Claims (7)

1. A two-stage hydraulic speed regulation system, comprising:
The hydraulic cylinder is a differential hydraulic cylinder and is provided with a first chamber and a second chamber;
the first reversing valve comprises a shell, wherein the shell is provided with a first valve cavity, a first liquid inlet, a first liquid return port, a first control port and a first working port, the first liquid inlet is communicated with the first cavity, the first liquid inlet is communicated with the liquid inlet pipeline, the first liquid return port is communicated with the liquid return pipeline, the first reversing valve is switchable among a first state, a second state and a third state, when the first reversing valve is in the first state, the first working port is disconnected from the first liquid return port, when the first reversing valve is in the second state, the first working port is communicated with a part of the first liquid inlet, and when the first reversing valve is in the third state, the first working port is communicated with all of the first liquid inlet;
the second reversing valve is provided with a second liquid inlet, a second liquid return port, a second control port and a second working port, the second working port is communicated with the second cavity, the second liquid inlet is communicated with the liquid inlet pipeline, the second liquid return port is communicated with the liquid return pipeline, the second reversing valve is switchable between a fourth state and a fifth state, when the second reversing valve is in the fourth state, the second working port is communicated with the second liquid inlet, and when the second reversing valve is in the fifth state, the second working port is communicated with the second liquid return port; and
The control system is used for controlling the first reversing valve to be in the third state, the second reversing valve to be in the fourth state, the first reversing valve to be in the second state, the second reversing valve to be in the fifth state, and the first reversing valve to be in the first state, and the second reversing valve to be in the fourth state;
the control system includes:
the first pilot valve is provided with a third working fluid inlet, a third working fluid outlet and a third inlet and outlet, the third working fluid inlet is used for allowing the first pilot fluid to enter, the third working fluid inlet is communicated with a liquid inlet pipeline, the third working fluid outlet is communicated with the liquid return pipeline, and the third inlet and outlet are communicated with the first control port; and
the second pilot valve is provided with a fourth working fluid inlet, a fourth working fluid outlet and a fourth inlet and outlet, the fourth working fluid inlet is used for allowing a second pilot fluid to enter, the fourth working fluid inlet is communicated with a liquid inlet pipeline, the fourth working fluid outlet is communicated with the liquid return pipeline, and the fourth inlet and outlet are communicated with the second control port;
The one-way overflow valve is provided with a first inlet and a first outlet, the third inlet and the first control port are communicated with the first inlet, and the fourth inlet and the second control port are communicated with the first outlet.
2. The two-stage hydraulic speed regulation system of claim 1 wherein the first valve chamber has first and second sealing surfaces disposed in spaced relation along the axial direction of the housing, the first reversing valve further comprising:
the liquid inlet valve core and the liquid return valve core are both movably arranged in the first valve cavity along the axial direction of the shell, the liquid inlet valve core is provided with a first pushing part and a second pushing part third sealing surface which are arranged along the axial direction of the shell, the liquid return valve core is provided with a third pushing part, a fourth pushing part and a fourth sealing surface which are arranged along the axial direction of the shell, the third pushing part is used for pushing the second pushing part along the axial direction of the shell, the second pushing part and the fourth pushing part are used for being pushed by control liquid entering by the first control port, the third sealing surface is used for being matched with the first sealing surface to control the on-off of the first working port and the first liquid return port, the fourth sealing surface is used for being matched with the second sealing surface to control the on-off of the first working port and the first liquid inlet, the second pushing part is positioned between the third pushing part and the third sealing surface along the axial direction of the shell, and the distance between the third pushing part and the third sealing surface is smaller than the first working port and the second sealing surface along the axial direction of the shell; and
The shell is provided with a contact part, and two ends of the return spring respectively lean against the contact part and the first pushing part.
3. The two-stage hydraulic speed regulation system of claim 2 wherein the first return port is located between the first inlet port and the first control port in the axial direction of the housing, and the first inlet port is located between the first working port and the first return port in the axial direction of the housing.
4. The two-stage hydraulic speed regulation system according to claim 2 or 3, wherein the sum of the projected areas of the second pushing portion and the fourth pushing portion along the axial direction of the housing is S1, the projected area of the second pushing portion along the axial direction of the housing is S2, and the ratio of S1 to S2 is 1.1-5.
5. The two-stage hydraulic speed regulation system of claim 1 wherein the control system further comprises:
the first one-way valve is arranged on the liquid inlet pipeline; and/or
The second one-way valve is arranged on the liquid return pipeline.
6. The two-stage hydraulic speed regulation system of claim 1 further comprising a filter disposed on the feed line.
7. A hydraulic mount comprising the two-stage hydraulic speed regulation system of any one of claims 1-6.
CN202210451720.4A 2022-04-26 2022-04-26 Two-stage hydraulic speed regulating system and hydraulic support Active CN114876893B (en)

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AU2022456592A AU2022456592A1 (en) 2022-04-26 2022-06-16 Multi-stage hydraulic speed regulation system, and hydraulic support
PCT/CN2022/099256 WO2023206747A1 (en) 2022-04-26 2022-06-16 Multi-stage hydraulic speed regulation system, and hydraulic support

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