CN114718925A - Three-stage hydraulic speed regulating system and hydraulic support - Google Patents

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

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Publication number
CN114718925A
CN114718925A CN202210451719.1A CN202210451719A CN114718925A CN 114718925 A CN114718925 A CN 114718925A CN 202210451719 A CN202210451719 A CN 202210451719A CN 114718925 A CN114718925 A CN 114718925A
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China
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valve
liquid
port
inlet
state
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CN202210451719.1A
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CN114718925B (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 CN202210451719.1A priority Critical patent/CN114718925B/en
Priority to AU2022456592A priority patent/AU2022456592A1/en
Priority to PCT/CN2022/099256 priority patent/WO2023206747A1/en
Publication of CN114718925A publication Critical patent/CN114718925A/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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • 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
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

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

Description

Three-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 three-level hydraulic speed regulating system and a hydraulic support.
Background
The electro-hydraulic control reversing valve is a control core component of an electro-hydraulic control system, is a hydraulic reversing valve which is formed by combining an electromagnetic pilot valve and a main valve into a whole, utilizes high-pressure liquid in a liquid path of the electromagnetic pilot valve to push a valve core of the main valve to control the action of an executing element, is used as a key element of electro-hydraulic control of a hydraulic support, and plays an important role in realizing comprehensive mechanical mining and unmanned mining of coal mines. In the related technology, the accurate control of the hydraulic support is difficult to realize so as to meet the requirements of mechanized and unmanned mining of coal mines.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a three-level hydraulic speed regulating system to improve the control precision of the three-level hydraulic speed regulating system.
The embodiment of the invention also provides a hydraulic support to improve the control precision of the hydraulic support.
The three-level hydraulic speed regulation 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;
the first reversing valve is connected with the first cavity and switchable among a first state, a second state and a third state, a first liquid return port of the first reversing valve in the first state is communicated with the first cavity, a part of a first liquid inlet of the first reversing valve in the second state is communicated with the first cavity, and the whole first liquid inlet of the first reversing valve in the third state is communicated with the first cavity;
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;
a control system for controlling the first direction valve to be in a third state while the second direction valve is in a fifth state, the first direction valve to be in the third state while the second direction valve is in the fourth state, the first direction valve to be in the second state while the second direction valve is in the fifth state, the first direction valve to be in the first state while the second direction valve is in the fourth state.
The three-level 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 three-stage hydraulic speed regulation system includes a liquid inlet line and a liquid return line, the first direction valve includes a housing, the housing has a first valve chamber, and the first liquid inlet, the first liquid return port, a first control port, and a first working port that are communicated with the first valve chamber, the first working port is communicated with the first chamber, the first liquid inlet is communicated with the liquid inlet line, the first liquid return port is communicated with the liquid return line, when the first direction valve is in the first state, the first working port is disconnected from the first liquid return port, when the first direction valve is in the second state, the first working port is communicated with a part of the first liquid inlet, and when the first direction 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 chamber is provided with a first sealing surface and a second sealing surface which are arranged at intervals along the axial direction of the housing, and the first direction valve further comprises:
the liquid inlet valve core and the liquid return valve core are 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, a second pushing part and a 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 from 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, and 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 in the axial direction of the shell, and the distance between the third pushing part and the third sealing surface along the axial direction of the shell is less than or equal to the distance between the second pushing part and the first sealing surface along the axial direction of the shell when the first working port is disconnected from the first liquid inlet;
the shell is provided with a contact part, and two ends of the return spring are respectively abutted 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, a sum of projected areas of the second pushing part and the fourth pushing part in the axial direction of the housing is S1, a projected area of the second pushing part in the axial direction of the housing is S2, and a ratio of the S1 to the S2 is 1.1-5.
In some embodiments, the second direction 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 communicated with the second chamber, the second liquid inlet is communicated with the liquid inlet pipeline, the second liquid return port is communicated with the liquid return pipeline, when the second direction valve is in the fourth state, the second working port is communicated with the second liquid inlet, and when the second direction valve is in the fifth state, the second working port is communicated with the second liquid return port.
In some embodiments, the control system comprises:
the first pilot valve is provided with a third working liquid inlet, a third working liquid outlet and a third inlet and outlet, the third working liquid inlet is used for the first pilot liquid to enter, the third working liquid inlet is communicated with a liquid inlet pipeline, the third working liquid outlet is communicated with a liquid return pipeline, and the third inlet and outlet is communicated with the first control port;
the second pilot valve is provided with a fourth working liquid inlet, a fourth working liquid outlet and a fourth inlet and outlet, the fourth working liquid inlet is used for second pilot liquid to enter, the fourth working liquid inlet is communicated with the liquid inlet pipeline, the fourth working liquid outlet is communicated with the liquid return pipeline, and the fourth inlet and outlet is communicated with the second control port.
In some embodiments, the control system further comprises:
the third pilot valve is provided with a fifth working liquid inlet, a fifth working liquid outlet and a fifth inlet and outlet, the fifth working liquid inlet is used for third pilot liquid to enter, the fifth working liquid inlet is communicated with the liquid inlet pipeline, and the fifth working liquid outlet is communicated with the liquid return pipeline;
the first inlet and the second inlet are communicated with the first inlet, and the first control port is communicated with the fifth inlet and the fifth outlet; and/or
The first one-way valve is arranged on the liquid inlet pipeline; and/or
And the second one-way valve is arranged on the liquid return pipeline.
In some embodiments, the liquid filter further comprises a filter, and the filter is arranged on the liquid inlet pipeline.
The hydraulic support comprises the three-stage hydraulic speed regulation system.
Therefore, the hydraulic support has the advantages of being high in control accuracy and the like.
Drawings
Fig. 1 is a schematic structural diagram of a three-stage hydraulic governor system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first reversing valve in the three-stage hydraulic governor system according to the embodiment of the invention in the first state.
Fig. 3 is a schematic structural diagram of the three-stage hydraulic governor system according to the embodiment of the present invention, in which the first direction valve is in the second state.
Fig. 4 is a schematic structural diagram of the three-stage hydraulic governor system according to the embodiment of the present invention, in which the first direction valve is in the third state.
Reference numerals:
a three-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 direction valve 2; a first liquid inlet 201; a first fluid return port 202; a first control port 203; a first working port 204; a housing 205; the contact portion 2051; a first valve chamber 2052; a first sealing surface 2053; a second sealing surface 2054; a housing body 2055; a pressure ring 2056; an end cap 2057; a liquid inlet valve core 206; a first ejector 2061; a second pushing portion 2062; a fourth sealing surface 2063; a mating segment 2064; a third end surface 2065; a return valve core 207; a third ejector 2071; a fourth pushing part 2072; a third sealing surface 2073; a macro-porous section 2074; a small pore section 2075; a first end surface 2076; a second end surface 2077; a return spring 208;
a second direction valve 3; a second inlet 301; a second return port 302; a second control port 303; a second working port 304;
a first pilot valve 4; a third working fluid inlet 401; a third working fluid outlet 402; a third inlet and outlet 403;
a second pilot valve 5; a fourth working fluid inlet 501; a fourth working fluid outlet 502; a fourth port 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 arranged in such a way that,
a liquid inlet line 1001; a liquid return line 1002;
a third pilot valve 11; a fifth working fluid inlet 1101; a fifth working fluid outlet 1102; a fifth port 1103.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The technical solution of the present application is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, a three-stage hydraulic governor system 100 according to an embodiment of the present invention includes a hydraulic cylinder 1, a first direction valve 2, a second direction valve 3, and a control system 7.
The hydraulic cylinder 1 is a differential hydraulic cylinder, and the hydraulic cylinder 1 has a first chamber 104 and a second chamber 105.
The first reversing valve 2 is connected with the first cavity 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 with the first cavity 104, the first liquid inlet 201 of the first reversing valve 2 in the second state is partially communicated with the first cavity 104, and the first liquid inlet 201 of the first reversing valve 2 in the third state is fully communicated with the first cavity 104.
The second direction valve 3 is connected with the second chamber 105, the second direction valve 3 is switchable between a fourth state and a fifth state, the second liquid inlet 301 of the second direction valve 3 in the fourth state is communicated with the second chamber 105, and the second liquid return port 302 of the second direction valve 3 in the fifth state is communicated with the second chamber 105.
The control system 7 is used for controlling the first direction valve 2 to be in the third state while the second direction valve 3 is in the fifth state, the first direction valve 2 to be in the third state while the second direction valve 3 is in the fourth state, the first direction valve 2 to be in the second state while the second direction valve 3 is in the fifth state, and the first direction valve 2 to be in the first state while the second direction valve 3 is in the fourth state.
As shown in fig. 1, the hydraulic cylinder 1 includes a cylinder 101, a piston 102, and a piston rod 103, and the piston 102 partitions the cylinder 101 into a first chamber 104 and a second chamber 105. The piston rod 103 is arranged in a second chamber 105 and connected to the piston 102, the first chamber 104 being a rodless chamber and the second chamber 105 being a rod chamber.
Disconnecting the first fluid return port 202 from the first chamber 104 may be understood as the first fluid return port 202 being open, and the first working fluid may flow out of the first chamber 104 through the first fluid return port 202. The first inlet port 201 is in partial communication with the first chamber 104, which is to be understood that the first inlet port 201 is open to a smaller area than the first inlet port 201, and the first working fluid may enter the first chamber 104 through the first inlet port 201 at a small flow rate. The first liquid inlet 201 is communicated with the first chamber 104, which means 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 fluid can enter the first chamber 104 through the first liquid inlet 201 at a large flow rate. The first working fluid is a working fluid entering and exiting the first chamber 104.
The second inlet 301 is in communication with the second chamber 105, which means that the second inlet 301 is open, and the second working fluid can enter the second chamber 105 through the second inlet 301. The second liquid return port 302 is communicated with the second chamber 105, and it can be understood that the second liquid return port 303 is opened, and the second working fluid can flow out of the second chamber 105 through the second liquid return port 303. The second working fluid is a working fluid entering and exiting the second chamber 105.
When the three-stage hydraulic speed regulating 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 working fluids with the same pressure, that is, the pressures of the first working fluid and the second working fluid are the same, for example, the first working fluid and the second working fluid are the same working fluid. The control system 7 controls the first reversing valve 2 and the second reversing valve 3 to be in different states, so that the three-stage hydraulic speed regulation system 100 can have the following four 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 fifth state. At this time, the first working fluid enters the first chamber 104 through the first fluid inlet 201 at a large 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 large thrust to the piston 102 toward the second chamber 105, the piston 102 rapidly moves toward the second chamber 105 under the thrust, and the piston rod 103 rapidly extends outward.
In the second 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 liquid inlet 201 at a large flow rate, the second working fluid can enter the second chamber 105 through the second liquid inlet 301, so that the working fluid with the same pressure enters the first chamber 104 and the second chamber 105, and the force-bearing area of the piston 102 in the first chamber 104 is larger than that of the piston 102 in the second chamber 105 due to the piston rod 103 in the second chamber 105, so that the hydraulic cylinder 1 is a differential hydraulic cylinder. Since the working fluid in the first chamber 104 applies a thrust to the piston 102 that is greater than a thrust applied to the piston 102 by the working fluid in the second chamber 105, the piston 102 moves toward the second chamber 105 under a differential action, and the piston rod 103 extends differentially.
In the third 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, 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 toward the second chamber 105, the piston 102 slowly moves toward the second chamber 105 under the thrust force, and the piston rod 103 slowly extends outward.
And in a fourth 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 port 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 retracts.
Therefore, the three-stage hydraulic speed regulating system 100 of the embodiment of the invention controls the first reversing valve 2 and the second reversing valve 3 to be in different states, so that the piston rod 103 of the hydraulic cylinder 1 can realize four working states of quick extension, differential extension, slow extension and retraction, and the control precision of the three-stage hydraulic speed regulating system 100 of the embodiment of the invention is favorably improved. During specific implementation, the flow of the first reversing valve 1 in the second state is reasonably designed, so that the moving speed of differential extension of the hydraulic cylinder 1 is greater than the moving speed of slow extension, the moving speed of rapid extension is greater than the moving speed of differential extension, the moving speed of differential extension is greater than the moving speed of slow extension, and the control precision of the hydraulic support with the three-stage hydraulic speed regulation system 100 can be improved.
Therefore, the three-stage hydraulic speed regulating system 100 provided by the embodiment of the invention has the advantages of high control precision and the like.
In some embodiments, the three-stage hydraulic governor system 100 includes an inlet line 1001 and an outlet line 1002, and the first directional valve 2 includes a housing 205, an inlet spool 206, an outlet spool 207, and a return spring 208.
The housing 205 has a first valve chamber 2052, and a first inlet port 201, a first return port 202, a first control port 203, and a first working port 204 that communicate with the first valve chamber 2052. The first working port 204 is communicated with the first chamber 104, the first liquid inlet 201 is communicated with a liquid inlet pipeline 1001, and the first liquid return port 202 is communicated with a liquid return pipeline 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 direction valve 2 is in the third state, the first working port 204 is fully communicated with the first liquid inlet 201.
It is understood that the first working port 204 is in communication with the first fluid return port 202, as shown in fig. 2, the first fluid return port 202 is opened, the first chamber 104 is in communication with the first fluid return port 202 through the first working port 204, and the first working fluid in the first chamber 104 flows out through the first fluid return port 202. The first working port 204 is partially communicated with the first liquid inlet 201, which can be understood as that, as shown in fig. 3, the open area of the first liquid inlet 201 is smaller than that of the first liquid inlet 201, and at this time, the first working liquid can enter the first working port 204 at a small flow rate. It can be understood that the first working port 204 is in communication with the first liquid inlet 201, 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 at a large flow rate.
The first reversing valve 2 is convenient to be connected 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 an interval in the axial direction of the casing 205, the first direction changing valve 2 further includes a liquid inlet valve core 206 and a liquid return valve core 207 disposed in the first valve cavity 2052 movably in the axial direction of the casing 205, the liquid inlet valve core 206 has a first pushing portion 2061, a second pushing portion 2062 and a third sealing surface 2073 disposed in the axial direction of the casing 205, and the liquid return valve core 207 has a third pushing portion 2071, a fourth pushing portion 2072 and a fourth sealing surface 2063 disposed in the axial direction of the casing 205. The third pushing part 2071 is used for pushing the second pushing part 2062 in the axial direction of the casing 205, and the second pushing part 2062 and the fourth pushing part 2072 are used for being pushed by the control liquid entering 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 of the casing 205, and the distance between the third pushing part 2071 and the third sealing surface 2073 in the axial direction of the casing 205 is less than or equal to the distance between the second pushing part 2062 and the first sealing surface 2053 in the axial direction of the casing 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 is further described below by taking as an example that 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 inlet port 201, the first fluid return port 202 and the first control port 203 are sequentially arranged in a left-to-right direction, the fourth sealing surface 2063, the second sealing surface 2054, the first sealing surface 2053 and the third sealing surface 2073 are sequentially arranged in a left-to-right direction, and the first sealing surface 2053 and the second sealing surface 2054 are located between the first inlet port 201 and the first fluid return port 202. The liquid inlet valve core 206 is located on the left side of the housing 205, the liquid return valve core 207 is located on the right side of the housing 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 rightwards. The third ejector 2071 is located to the left of the fourth ejector 2072, the third ejector 2071 is located to the right of the third sealing surface 2073, and the second ejector 2062 is located between the third ejector 2071 and the third sealing surface 2073. The control fluid entering the first control port 203 pushes the second pushing part 2062 and the fourth pushing part 2072 leftward.
It will be appreciated that the first port 201 is disconnected from the first port 204 when the second sealing surface 2054 abuts the fourth sealing surface 2063, and the first fluid return port 202 is disconnected from the first port 204 when the third sealing surface 2073 abuts the first sealing surface 2053.
When the control liquid pressure of the first control port 203 is the first preset pressure, the control liquid cannot push the fourth pushing part 2072 and the second pushing part 2062 to move leftward simultaneously, so that the second sealing surface 2054 and the fourth sealing surface 2063 are separated, at this time, the first working port 204 is disconnected from the first liquid inlet 201, the first liquid inlet 201 is closed, and the first directional control valve 2 is in the first state, that is, 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 fluid 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 core 206 cannot move leftward, that is, the opening of the first liquid inlet 201 cannot be realized, only by pushing the second pushing part 2062 with the control hydraulic fluid, because the distance between the third pushing part 2071 and the third sealing surface 2073 along the axial direction of the casing 205 is less than or equal to the distance between the second pushing part 2062 and the first sealing surface 2053 along the axial direction of the casing 205 when the first working port 204 is disconnected from the first liquid inlet 201, and 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, because the distance between the third pushing part 2071 and the third sealing surface 2073 along the axial direction of the casing 205 is less than or equal to the distance between the second pushing part 2062 and the first sealing surface 2053 along the axial direction of the casing 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 may be partially opened, so that a small amount of liquid inlet is realized, that is, the first direction 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 first liquid inlet 201 can be opened only by controlling the hydraulic pushing of the second pushing portion 2062. It can be understood that when the third sealing surface 2073 abuts against the first sealing surface 2053, the third pushing part 2071 cannot move leftward together with the second pushing part 2062, but because the third preset pressure is greater than the second preset pressure, the second pushing part 2062 can move leftward under the action of the single pushing action of the control liquid, at this time, the second pushing part 2062 is separated from the third pushing part 2071, and the control liquid pushes the second pushing part 2062 to move leftward until it is completely opened, so that full-flow liquid feeding is realized, that is, the first direction valve 2 is in the third state (as shown in fig. 4).
In some embodiments, the sum of the projected areas of the second and fourth pushing portions 2062 and 2072 in the axial direction of the casing 205 is S1, the projected area of the second pushing portion 2062 in the axial direction of the casing 205 is S2, and the ratio of S1 to S2 is 1.1-5.
It can 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 by the single pushing action of the control hydraulic; when the control hydraulic pressure of the first control port 203 is the second preset pressure, because the second preset pressure is smaller than the third preset pressure, the liquid inlet valve plug 206 cannot move leftward only by pushing the second pushing portion 2062 with the control liquid. 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 part 2062 and the third pushing part 2071 have a larger force-receiving area together, so that the second pushing part 2062 is subjected to a larger pushing force under the combined action of the control liquid pushing and the pushing of the third pushing part 2071, so that the second pushing part 2062 moves leftward, so that the first liquid inlet 201 can be partially opened, and a small flow of the liquid can be realized (as shown in fig. 2).
Through reasonably setting the ratio of the S1 to the S2, it can be effectively ensured that the second pushing portion 2062 can drive the liquid inlet valve element 206 to move leftward under the dual pushing action of the third pushing portion 2071 and the control liquid leftward, so as to realize small-flow liquid inlet of the first liquid inlet 201, and further ensure that the whole structure of the liquid return valve element 207 is reasonably designed.
When the first reversing valve 2 of the three-stage hydraulic speed regulation system 100 of the embodiment of the invention is used:
the pressure P of the first working fluid introduced from the first fluid inlet 2010Pressure P of the third working fluid supplied from the first fluid return port 202RThe pressure of the control liquid introduced into the first control port 203 is PK. Assume that the control hydraulic pressure of the first control port 203 is PK1(second preset pressure), the liquid return valve core 207 is just under the pushing action of the control liquidIt will move to the left, assuming the pilot hydraulic pressure of the first pilot port 203 is PK2(third preset pressure), the liquid inlet valve core 206 just moves leftwards to open the first liquid inlet 201 at the full flow rate only under the pushing action of the control liquid, that is, 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 0R＜PK1＜PK2≤P0。
When P is presentK＜PRWhen the working fluid is supplied to the first liquid inlet 201, the first working port 204 is connected to the second liquid inlet 201, and the second liquid inlet 201 is connected to the second liquid inlet 204, as shown in fig. 2, under the combined action of the return spring 208 and the working fluid pressure of the first working port, the fourth sealing surface 2063 abuts against the second sealing surface 2054, so that the first working port 204 is disconnected from the first working port 201, and the opening area of the first liquid inlet 201 is zero, that is, the first working fluid of the first liquid inlet 201 enters the first working port 204 at a zero flow rate.
When P is presentK1＜PK＜PK2When, as shown in FIG. 3, because PK＜PK2Therefore, the second pushing portion 2062 cannot drive the liquid inlet valve core 206 to move leftward to open the first liquid inlet 201 at the full flow rate under the pushing action of the control liquid alone. Although P isK＜PK2However, 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 leftward, the liquid return valve plug 207 has a larger leftward pushing force, so that the second pushing portion 2062 can push the liquid inlet valve plug 206 leftward under the dual pushing action of the third pushing portion 2071 and the control liquid, the third sealing surface 2073 abuts against the first sealing surface 2053, and the fourth sealing surface 2053 is separated from the second sealing surface 2054, so that the opening area of the first liquid inlet 206201 is smaller than the area of the first liquid inlet 201, that is, the small flow rate of the first working liquid of the first liquid inlet 201 flows through the first working port 204.
When P is presentK2＜PKWhen the liquid inlet valve core 206 moves to the left, the opening area of the first liquid inlet 201 is the total area of the first liquid inlet 201, that is, the first liquid inlet 201, as shown in fig. 4, the third sealing surface 2073 abuts against the first sealing surface 2053, the second pushing part 2062 is separated from the third pushing part 2071, and the second pushing part 2062 only pushes the control liquid alone to separate the fourth sealing surface 2063 from the second sealing surface 2054The first working fluid from the fluid inlet 201 flows through the first working port 204 at a full flow rate.
In some embodiments, the first fluid return port 202 is axially of the housing 205 between the first inlet port 201 and the first control port 203, and the first inlet port 201 is axially of the housing 205 between the first working port 204 and the first fluid return port 202.
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 direction valve 2 is in the first state and the second state, and 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 direction valve 2 is in the third state.
As shown in fig. 2 to 4, when the first direction valve 2 is in the first state (shown in fig. 2), the fourth sealing surface 2063 and the second sealing surface 2054 are tightly attached, the first inlet 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 is communicated with the first fluid return port 202.
When the first direction 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 tightly attached, the first working port 204 is disconnected from the first fluid return port 202, the fourth sealing surface 2063 is separated from the second sealing surface 2054, and the first fluid inlet 201 is communicated with the first working port 204.
Therefore, the first sealing surface 2053 and the third sealing surface 2073 are arranged, so that the liquid return valve core 207 can conveniently control the on-off of the first liquid return port 202 and the first working port 204; by arranging the second sealing surface 2054 and the fourth sealing surface 2063, the liquid inlet valve plug 2062 is convenient to control 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 flow of the three-stage hydraulic speed adjusting system 100 in the embodiment of the invention is convenient to adjust.
Alternatively, the liquid return valve core 207 includes a large hole section 2074 and a small hole section 2075 arranged in the axial direction of the casing 205, the large hole section 2074 having an inner diameter larger than an inner diameter of the small hole section 2075, the large hole section 2074 being arranged closer to the first intake port 201 than the small hole section 2075 in the axial direction of the casing 205, the small hole section 2075 having a first end surface 2076 and a second end surface 2077 opposite to each other in the axial direction of the casing 205, the first end surface 2076 being arranged closer to the first intake port 201 than the second end surface 2077 in the axial direction of the casing 205, the first end surface 2076 forming a third push 2071, and the second end surface 20772 forming a fourth push 2072.
For example, as shown in fig. 1 to 3, the small hole 2075 is located at the right side of the large hole 2074, the first end surface 2076 is located at the left side of the second end surface 2077, the holes of the small hole 2075 and the large hole 2074 are both arranged in the left-right direction, the hole of the small hole 2075 and the hole of the large hole 2074 are coaxially arranged, the control liquid entering through the first control port 203 enters the hole of the large hole 2074 through the hole of the small hole 2075, and contacts the second pushing part 2062 to push the second pushing part 2062.
In particular, when the first change-over valve 2 is in the second state (as shown in fig. 3), i.e. PK1＜PK＜PK2When the liquid returning valve core 207 moves to the third pushing part 2071 and the second pushing part 2062 to contact, the third pushing part 2071 and the control liquid simultaneously push the second pushing part 2062 to drive the liquid inlet valve core 206 to move leftwards, and when the liquid inlet valve core 206 moves to the third sealing surface 2073 of the liquid returning valve core 207 to contact with the first sealing surface 2053, the liquid returning valve core 207 cannot move leftwards any more, and because of P, the liquid returning valve core 207 moves leftwardsK＜PK2，The liquid inlet valve core 206 cannot move leftward only under the action of the control liquid pushing the second pushing portion 2062, at this time, the opening area of the first liquid inlet 201 is smaller than that of the first liquid inlet 201, that is, the first working liquid of the first liquid inlet 201 enters the first working port 204 through the opened part of the first liquid inlet 201 with a small area and a small flow rate.
When the first change-over valve 2 is in the third state, i.e. PK2＜PKAt the same time (as shown in fig. 4), the control liquid enters the large pore section 2074 from the small pore section 2075 to push the second pushing part 2062 due to PK2＜PKThe control liquid pressure is relatively large, the liquid inlet valve core 206 can move leftwards only under the action of single pushing of the control liquid, at the moment, the opening area of the first liquid inlet 201 is the area of the first liquid inlet 201, that is, the first working liquid of the first liquid inlet 201 enters the first working port 204 at the full flow rateAnd (4) the following steps.
Therefore, by arranging the liquid return valve core 207 into the large hole section 2074 and the small hole section 2075, and forming the third pushing part 2071 on the first end surface 2076 and the fourth pushing part 2072 on the second end surface 2077, not only is the third pushing part 2071 convenient to push the second pushing part 2062, but also the liquid pushing part 2062 and the fourth pushing part 2072 are convenient to control, so that the first reversing valve 2 has a simple structure, and the three-stage hydraulic speed regulating system 100 of the embodiment of the invention has a simple structure.
Optionally, a first installation groove is formed in the outer peripheral wall of the liquid return valve element 207, a first sealing ring is installed in the first installation groove, and the first sealing ring is used for sealing a gap between the outer wall surface of the liquid return valve element 207 and the inner wall surface of the housing 205, so as to improve the sealing performance of the first reversing valve 2.
Optionally, the intake valve core 206 includes a fitting section 2064, the large hole section 2074 is sleeved on the fitting section 2064, an inner circumferential surface of the large hole section 2074 is in sealing fit with an outer circumferential surface of the fitting section 2064, the fitting section 2064 has a third end surface 2065 facing the third pushing part 2071, the third end surface 2065 forms a second pushing part 2062, and a distance between the first end surface 2076 and the third sealing surface 2073 in the axial direction of the casing 205 is smaller than or equal to a distance between the third end surface 2065 and the first sealing surface 2053 in the axial direction of the casing 205.
Thus, the third end surface 2065 of the fitting segment 2064 forms the third pushing part 2071, thereby further simplifying and compacting the structure of the first direction valve 2.
Optionally, a second mounting groove is formed in the outer peripheral wall of the fitting section 2064, a second sealing ring is mounted in the second mounting groove, and the second sealing ring is used for sealing a gap between the outer wall surface of the fitting section 2064 and the inner wall surface of the large hole section 2074, so as to improve the sealing performance of the first reversing valve 2.
In some embodiments, a difference between a projected area of the second ejector 2062 in the axial direction of the casing 205 and a projected area of the third ejector 2071 in the axial direction of the casing 205 is S1, a projected area of the fourth ejector 2072 in the axial direction of the casing 205 is S2, and a ratio of S2 to S1 is 1.1 to 3.
For example, the ratio of S2 to S1 is 2.
By properly setting the ratio of S2 to S1, when the first direction valve 2 is in the second state (shown in FIG. 3), PK1＜PK＜PK2In the process, the second pushing part 2062 can be effectively ensured to drive the liquid inlet valve core 206 to move leftwards under the double pushing action of the third pushing part 2071 and the control liquid leftwards, and the fourth pushing part 2072 can have a smaller stress area to reduce the structural size of the liquid return valve core 207, so that the first reversing valve 2 is compact in overall structure.
Optionally, the first end surface 2076, the second end surface 2077 and the third end surface 2065 of the embodiment of the invention are all planes perpendicular to the axial direction of the casing 205, and the difference between the area of the third end surface 2065 and the area of the first end surface 2076 is smaller than the area of the second end surface 2077.
The first end surface 2076, the second end surface 2077 and the third end surface 2065 are all planes perpendicular to the axial direction of the casing 205, so that the liquid inlet valve core 206 and the liquid return valve core 207 are simple in structure, the liquid inlet valve core 206 and the liquid return valve core 207 are convenient to machine and manufacture, and the first reversing valve 2 is convenient to machine and manufacture.
In some embodiments, the projection area of the first pushing portion 2061 in the axial direction of the housing is smaller than the projection 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 pushes the first pushing portion 2061 rightward, and the projection area of the first pushing portion 2061 along the axial direction of the housing 205 is smaller than the projection area of the second pushing portion 2062 along the axial direction of the housing 205, so that when the first direction valve 2 is in the third state, the second pushing portion 2062 has a larger leftward pushing force to overcome the elastic force of the rightward return spring 208 and the rightward pushing force of the first working fluid on the first pushing portion 2061, and the fluid inlet valve plug 206 has a simple structure.
Optionally, the housing 205 includes a housing body 2055, a pressure ring 2056, and an end cap 2057. The casing body 2055 is a cylinder with openings at two axial ends, and the first liquid inlet 201, the first liquid return port 202 and the first control port 203 are all arranged on the casing body 2055. The pressing ring 2056 is provided at one end of the housing body 2055, the inner hole of the pressing ring 2056 forms the first working port 204, and the pressing ring 2056 forms the contact portion 2051. An end cap 2057 closes off the other end of the housing body 2055.
As shown in fig. 2 to 4, the pressing ring 2056 is disposed at the left end of the casing body 2055, an outer wall surface of the pressing ring 2056 is connected to an inner wall surface of the casing body 2055, the pressing 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 pressing ring 2056, a contact portion 2051 is formed at a right end surface of the pressing ring 2056, and the end cap 2057 seals the right end of the casing 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 installed in the first valve cavity 2052 of the housing 205, then the left port of the housing body 2055 is sealed by the pressing ring 2056, and the right port of the housing body 2055 is sealed by the end cover 2057, so that the assembly of the first reversing valve 2 is facilitated while the sealing performance of the first reversing valve 2 is improved.
Optionally, the collar 2056 is removably coupled to the housing body 2055.
For example, the pressure ring 2056 is in threaded connection with the housing body 2055, an external thread is arranged on the outer wall surface of the pressure ring 2056, an internal thread matched with the external thread on the pressure ring 2056 is arranged on the inner wall surface of the housing body 2055, and the installation of the pressure ring 2056 is facilitated by screwing the pressure ring 2056.
Optionally, a third mounting groove is formed in the inner wall surface of the pressing ring 2056, a third sealing ring is mounted in the third mounting groove, and the third sealing ring is used for sealing a gap between the inner wall surface of the pressing ring 2056 and the outer wall surface of the liquid inlet valve plug 2062.
Optionally, an end cap 2057 is removably coupled to the housing body 2055.
For example, the end cap 2057 is in threaded connection with the housing body 2055, an external thread is arranged on an outer wall surface of the end cap 2057, an internal thread matched with the external thread on the end cap 2057 is arranged on an inner wall surface of the housing body 2055, and the end cap 2057 is mounted by screwing the end cap 2057, so that the end cap 2057 is conveniently mounted.
Optionally, the housing body 2055 is a unitary structure.
Optionally, each of the first liquid inlet 201, the first liquid return ports 202 and the first control ports 203 is plural, the plural first liquid inlet 201 are arranged along the circumferential direction of the casing body 2055 at uniform intervals, the plural first liquid return ports 202 are arranged along the circumferential direction of the casing body 2055 at uniform intervals, and the plural first control ports 203 are arranged along the circumferential direction of the casing body 2055 at uniform intervals. Each of the plurality of first liquid inlets 201 is communicated with a liquid inlet pipe 1001, and each of the plurality of first liquid return ports 202 is communicated with a liquid return pipe 1002.
In some embodiments, the second direction valve 3 has a second inlet port 301, a second return port 302, a second control port 303 and a second working port 304, the second working port 304 is communicated with the second chamber 105, the second inlet port 301 is communicated with the inlet pipe 1001, the second return port 302 is communicated with the return pipe 1002, the second working port 304 is communicated with the second inlet port 301 when the second direction valve 3 is in the fourth state, and the second working port 304 is communicated with the second return port 302 when the second direction 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 fluid can flow into the second chamber 105 through the second liquid inlet 301 and the second working port 304; when the second direction valve 3 is in the fifth state, the second working port 304 is communicated with the second liquid return port 302, and at this time, the second working liquid in the second chamber 105 can flow out through the second working port 304 and the second liquid return port 302.
Through setting up second inlet 301, second liquid return port 302, second control mouth 303 and second work mouth 304, conveniently realize the intercommunication of second switching-over valve 3 with feed liquor pipeline 1001 and liquid return pipeline 1002.
In some embodiments, as shown in fig. 1, the control system 7 comprises 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 and outlet 403, the third working fluid inlet 401 is used for the first pilot fluid to enter, the third working fluid inlet 401 is communicated with a fluid inlet pipeline 1001, the third working fluid outlet 402 is communicated with a fluid return pipeline 1002, and the third inlet and 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 communicated with the fluid inlet pipeline 1001, the fourth working fluid outlet 502 is communicated with the fluid return pipeline 1002, and the fourth inlet/outlet 503 is communicated 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 directional control valve 2 through the third inlet and outlet 403, so as to control the first directional control 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/outlet 403, at this time, the third working fluid inlet 401 is disconnected from the third inlet/outlet 403, the third inlet/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 directional control valve 2 is in the first state. Wherein, the first pilot fluid is the pilot fluid entering and exiting 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/outlet 503, and at this time, the second pilot fluid may enter the second pilot valve 5 through the fourth working fluid inlet 501 and flow into the second control port 303 of the second direction valve 3 through the fourth inlet/outlet 503 to control the second direction 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/outlet 503, the fourth inlet/outlet 503 is communicated with the fourth working fluid outlet 502, and the control fluid in the second control port 303 of the second directional 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, so as to control the second directional valve 3 to be in the fifth state. Wherein the second pilot fluid is a pilot fluid entering and exiting the second pilot valve 5.
Therefore, the first pilot valve 4 is arranged, so that the first reversing valve 2 can be conveniently controlled in a first state, a second state and a third state; 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 three-stage hydraulic speed regulating system 100 provided by the embodiment of the invention has a simple structure and is more convenient to adjust and control.
Optionally, each of the first and second pilot valves 4, 5 is an electromagnetic pilot valve, and the control system 7 is electrically connected to each of the first and second pilot valves 4, 5.
In some embodiments, the control system 7 further comprises a one-way relief valve 6 and a third pilot valve 11, the third pilot valve 11 having a fifth working fluid inlet 1101, a fifth working fluid outlet 1102 and a fifth port 1103. The fifth working fluid inlet 1101 is used for the third pilot fluid to enter, the fifth working fluid inlet 1101 is communicated with the fluid inlet pipeline 1001, and the fifth working fluid outlet 1102 is communicated with the fluid return pipeline 1002.
The relief and check valve 6 has a first inlet 601 and a first outlet 602, the third inlet 403 and the first pilot port 203 both communicate with the first inlet 601, and the fourth inlet 503 and the second pilot port 303 both communicate with the first outlet 602.
Specifically, when the third pilot valve 11 is opened, the fifth working fluid inlet 1101 is communicated with the fifth inlet/outlet 1103, and at this time, the third pilot fluid may enter the third pilot valve 11 through the fifth working fluid inlet 1101 and flow out through the fifth inlet/outlet 1103; when the third pilot valve 11 is closed, the fifth inlet/outlet port 1103 communicates with the fifth working fluid outlet port 1102, and at this time, the fifth working fluid inlet port 1101 is disconnected from the fifth inlet/outlet port 1103. The third pilot fluid is a pilot fluid that enters and exits the third pilot valve 11.
For example, as shown in fig. 1, when the three-stage hydraulic governor system 100 according to the embodiment of the present invention is in use, the pressure of the working fluid in the fluid inlet pipe 1001 is P0The pressure of the working fluid in the return pipe 1002 is PR，
When the three-stage hydraulic speed regulating system 100 of the embodiment of the invention needs to be in the first working state (the hydraulic cylinder 1 is rapidly extended), the first pilot valve 4 and the third pilot valve 11 are opened, and the second pilot valve 5 is closed at the same time. After the first pilot fluid enters the first pilot valve 4 and flows out through the third inlet and outlet 403, a part of the first pilot fluid flows into the one-way overflow valve 6 through the first inlet 601, and the other part of the first pilot fluid enters the first reversing valve 2 through the first control port 203 to form a control fluid. The third pilot fluid enters the third pilot valve 11 and then flows to the first outlet 602 through the fifth inlet/outlet 1003.The first pilot fluid at the first inlet 601 of the one-way overflow valve 6 and the third pilot fluid at the first outlet 602 of the one-way overflow valve 6 are the same and are both P0The pressure of the first pilot fluid flowing into the first control port 203 is set to P0The first direction valve 2 is fully open, so that the first direction valve 2 is in the third state. Since the second pilot valve 5 is in the closed state, that is, the second pilot valve 5 is in the fifth state, the piston rod 103 is rapidly extended.
When the three-stage hydraulic governor system 100 of the embodiment of the present invention needs to be in the second operating state (the hydraulic cylinder 1 is extended differentially), the first pilot valve 4, the second pilot valve 5, and the third pilot valve 11 are simultaneously opened. The first pilot fluid enters the first pilot valve 4 and then flows out through the third inlet/outlet port 403. The third pilot fluid enters the third pilot valve 11 and then flows out through the fifth port 1003. The first pilot fluid at the first inlet 601 of the one-way overflow valve 6 and the third pilot fluid at the first outlet 602 of the one-way overflow valve 6 are the same and are both P0So that the pressure of the first pilot fluid flowing into the first control port 203 is at P0The first direction valve 2 is fully open, so that the first direction valve 2 is in the third state. Since the second pilot valve 5 is in the open state, i.e. the second pilot valve 5 is in the fourth state, the piston rod 103 is differentially extended.
When the three-stage hydraulic speed regulation system 100 according to the embodiment of the present invention needs to be in the third operating state (the hydraulic cylinder 1 is extended slowly), the second pilot valve 5 and the third pilot valve 11 are closed while the first pilot valve 4 is opened, the first pilot fluid enters the first pilot valve 4 and then flows out through the third inlet/outlet 403, and then a part of the first pilot fluid flows into the one-way relief valve 6 through the first inlet 601 and flows out through the first outlet 602, and because the third pilot valve 11 is in the closed state, the first pilot fluid flowing out from the first outlet 602 flows into the third pilot valve 11 through the fifth inlet/outlet 1103 and flows out through the fifth operating fluid outlet 1102. The other part of the first pilot fluid enters the first reversing valve 2 through the first control port 203 to form control fluid. The partial pressure of the relief/check valve 6 causes the pressure of the first pilot fluid flowing into the first control port 203 to be Pk1And PK2In such a way that the first pilot valve 2 is in the second stateState. Since the second pilot valve 5 is in the closed state, the second directional valve 3 is in the fifth state, and the piston rod 103 is extended slowly.
When the three-stage hydraulic speed regulating system 100 according to the embodiment of the present invention needs to be in the fourth operating state (the hydraulic cylinder 1 is retracted), the second pilot valve 5 is opened while the first pilot valve 4 and the third pilot valve 11 are closed, the third inlet/outlet port 403 is communicated with the third working fluid outlet port 402, the control fluid of the first control port 203 flows back into the fluid return line 1002, and the first directional control 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 then flows out through the fourth inlet/outlet 503, and the pressure of the second pilot fluid flowing out from the fourth inlet/outlet 503 is kept at P0And enters the second control port 303 to control the full flow opening of the second reversing valve 3, the second reversing valve 3 is in the 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 pilot valve 4 and the third pilot valve 11, the switching between the four working states of the three-level hydraulic speed regulating system 100 can be realized only by controlling the on-off of the first pilot valve 4, the second pilot valve 5 and the third pilot valve 11, so that the three-level hydraulic speed regulating system 100 provided by the embodiment of the invention is further simple in structure and convenient to control and adjust.
Optionally, the three-stage hydraulic speed regulating 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 line 1001, and the second check valve 802 is disposed on the liquid return line 1002.
As shown in fig. 1, the working fluid in the fluid inlet pipeline 1001 flows into the first pilot valve 4 and the second pilot valve 5 through the first one-way valve 801, so that the situation that the pilot fluid in the first pilot valve 4 and the second pilot valve 5 flows back into the fluid inlet pipeline 1001 to pollute the working fluid in the fluid inlet pipeline 1001 is effectively prevented, and the working reliability of the three-stage hydraulic speed regulating system 100 according to the embodiment of the present invention is improved.
The control liquid flowing out from 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 to the first pilot valve 4 and the second pilot valve 5, and the working reliability of the three-level hydraulic speed regulation system 100 according to the embodiment of the invention is further improved.
Optionally, the three-stage hydraulic governor system 100 according to the embodiment of the present invention further includes a filter 9, and the filter 9 is disposed on the liquid inlet pipeline 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, and the filter 9 is arranged to filter the working fluid in the fluid inlet pipeline 1001, so that the first pilot valve 4 or the second pilot valve 5 can be effectively prevented from being blocked by impurities in the working fluid in the fluid inlet pipeline 1001, and the working reliability of the three-stage hydraulic speed regulating system 100 according to the embodiment of the present 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 check valve 801, the second check valve 802, and the filter 9 is integrated into one module, so that the three-stage hydraulic speed regulating system 100 of the embodiment of the present invention is compact in structure and convenient to disassemble and replace.
The hydraulic support of the embodiment of the invention comprises a three-stage hydraulic speed regulation system 100.
For example, when the hydraulic support needs to extend 100cm for supporting, firstly, the first pilot valve 4 and the second pilot valve 5 are opened, the third pilot valve 11 is closed, and the piston rod 103 of the hydraulic support extends 80cm fast, so that the piston rod 103 of the hydraulic support can reach the position near the position needing to be supported fast; then, the first pilot valve 4, the second pilot valve 5 and the third pilot valve 11 are opened, and the piston rod 103 of the hydraulic support slowly extends out by 10cm, so that the piston rod 103 of the hydraulic support can slowly reach the position close to the position needing to be supported; finally, the first pilot valve 4 is opened, and the second pilot valve 5 and the third pilot valve 11 are closed, so that the piston rod 103 of the hydraulic support can reach the position to be supported accurately at a slow speed. Therefore, the three-level hydraulic speed regulating system 100 can be controlled to realize accurate control of the hydraulic support, and quick, accurate and reliable control of the action of the hydraulic support is realized.
Therefore, the hydraulic support has the advantages of being high in control accuracy and the like.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A three-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 is connected with the first cavity and switchable among a first state, a second state and a third state, a first liquid return port of the first reversing valve in the first state is communicated with the first cavity, a part of a first liquid inlet of the first reversing valve in the second state is communicated with the first cavity, and the whole first liquid inlet of the first reversing valve in the third state is communicated with the first cavity;
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; and
a control system for controlling the first directional valve to be in a third state while the second directional valve is in a fifth state, the first directional valve to be in the third state while the second directional valve is in the fourth state, the first directional valve to be in the second state while the second directional valve is in the fifth state, the first directional valve to be in the first state while the second directional valve to be in the fourth state.
2. The three-stage hydraulic governor system of claim 1, which includes a liquid inlet line and a liquid return line, the first reversing valve comprises a shell, the shell is provided with a first valve cavity, and the first liquid inlet, the first liquid return port, the first control port and the 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 is communicated with the liquid inlet pipeline, the first liquid return port is communicated with the liquid return pipeline, and when the first reversing valve is in the first state, the first working port is disconnected with the first liquid return port, and 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 the whole first liquid inlet.
3. The three-stage hydraulic speed regulation system of claim 2, wherein the first valve chamber is provided with a first sealing surface and a second sealing surface which are arranged at intervals along the axial direction of the housing, and the first reversing valve further comprises:
the liquid inlet valve core and the liquid return valve core are 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, a second pushing part and a 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 from 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, and 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 in the axial direction of the shell, and the distance between the third pushing part and the third sealing surface along the axial direction of the shell is less than or equal to the distance between the second pushing part and the first sealing surface along the axial direction of the shell when the first working port is disconnected from the first liquid inlet; and
the shell is provided with a contact part, and two ends of the return spring are respectively abutted against the contact part and the first pushing part.
4. The three-stage hydraulic governor system of claim 3, wherein the first fluid return port is axially between the first fluid inlet port and the first control port of the housing, and the first fluid inlet port is axially between the first working port and the first fluid return port of the housing.
5. The three-stage hydraulic governor system according to claim 3 or 4, wherein the sum of the projected areas of the second thrust portion and the fourth thrust portion in the axial direction of the casing is S1, the projected area of the second thrust portion in the axial direction of the casing is S2, and the ratio of S1 to S2 is 1.1 to 5.
6. The three-stage hydraulic speed regulating system according to claim 3 or 4, wherein the second direction 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 communicated with the second chamber, the second liquid inlet is communicated with the liquid inlet pipeline, the second liquid return port is communicated with the liquid return pipeline, when the second direction valve is in the fourth state, the second working port is communicated with the second liquid inlet, and when the second direction valve is in the fifth state, the second working port is communicated with the second liquid return port.
7. The three stage hydraulic governor system of claim 6, wherein the control system comprises:
the first pilot valve is provided with a third working liquid inlet, a third working liquid outlet and a third inlet and outlet, the third working liquid inlet is used for the first pilot liquid to enter, the third working liquid inlet is communicated with a liquid inlet pipeline, the third working liquid outlet is communicated with a liquid return pipeline, and the third inlet and outlet is communicated with the first control port;
the second pilot valve is provided with a fourth working liquid inlet, a fourth working liquid outlet and a fourth inlet and outlet, the fourth working liquid inlet is used for second pilot liquid to enter, the fourth working liquid inlet is communicated with the liquid inlet pipeline, the fourth working liquid outlet is communicated with the liquid return pipeline, and the fourth inlet and outlet is communicated with the second control port.
8. The three stage hydraulic governor system of claim 7, wherein the control system further comprises:
the third pilot valve is provided with a fifth working liquid inlet, a fifth working liquid outlet and a fifth inlet and outlet, the fifth working liquid inlet is used for third pilot liquid to enter, the fifth working liquid inlet is communicated with the liquid inlet pipeline, and the fifth working liquid outlet is communicated with the liquid return pipeline;
the first inlet and the second inlet are communicated with the first inlet, and the first control port is communicated with the fifth inlet and the fifth outlet; and/or
The first one-way valve is arranged on the liquid inlet pipeline; and/or
And the second one-way valve is arranged on the liquid return pipeline.
9. The three-stage hydraulic governor system of claim 7, further comprising a filter disposed on the intake line.
10. A hydraulic mount comprising a three stage hydraulic governor system as defined in any one of claims 1-9.
CN202210451719.1A 2022-04-26 2022-04-26 Three-stage hydraulic speed regulating system and hydraulic support Active CN114718925B (en)

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CN202210451719.1A CN114718925B (en) 2022-04-26 2022-04-26 Three-stage hydraulic speed regulating system and hydraulic support
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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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101285391A (en) * 2008-03-28 2008-10-15 北京天地玛珂电液控制系统有限公司 Vertical column and its inner pressurization hydraulic support setting load hoisting system
CN202833392U (en) * 2012-09-17 2013-03-27 三一重型装备有限公司 Electro-hydraulic main control valve and hydraulic system
CN104728203A (en) * 2015-03-26 2015-06-24 北京煤科天玛自动化科技有限公司 Electro-hydraulic control reversing valve with internal pressure relief function
CN111236998A (en) * 2019-10-29 2020-06-05 北京天地玛珂电液控制系统有限公司 Intrinsically safe electro-hydraulic control reversing valve for aqueous medium mine
CN111336148A (en) * 2020-03-24 2020-06-26 北京天地玛珂电液控制系统有限公司 Valve sleeve, valve core assembly and reversing valve
CN111473013A (en) * 2020-04-26 2020-07-31 郑州煤矿机械集团股份有限公司 Electro-hydraulic multi-speed buffer valve for near-water medium
CN111911216A (en) * 2020-06-19 2020-11-10 太原理工大学 Directional flow valve with continuous flow adjusting function and control method thereof
US20200408226A1 (en) * 2018-03-19 2020-12-31 Caterpillar Global Mining Europe Gmbh Hydraulic shield support system and pressure intensifier
CN113309547A (en) * 2021-04-29 2021-08-27 铁法煤业（集团）有限责任公司小青煤矿 Spraying valve group
CN114151113A (en) * 2021-10-22 2022-03-08 北京天玛智控科技股份有限公司 Linkage speed-regulating oil way for speed-regulating valve and hydraulic support
CN114165265A (en) * 2022-01-05 2022-03-11 郑州煤机液压电控有限公司 Electro-hydraulic main valve with integrated speed regulation function

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101285391A (en) * 2008-03-28 2008-10-15 北京天地玛珂电液控制系统有限公司 Vertical column and its inner pressurization hydraulic support setting load hoisting system
CN202833392U (en) * 2012-09-17 2013-03-27 三一重型装备有限公司 Electro-hydraulic main control valve and hydraulic system
CN104728203A (en) * 2015-03-26 2015-06-24 北京煤科天玛自动化科技有限公司 Electro-hydraulic control reversing valve with internal pressure relief function
US20200408226A1 (en) * 2018-03-19 2020-12-31 Caterpillar Global Mining Europe Gmbh Hydraulic shield support system and pressure intensifier
CN111236998A (en) * 2019-10-29 2020-06-05 北京天地玛珂电液控制系统有限公司 Intrinsically safe electro-hydraulic control reversing valve for aqueous medium mine
CN111336148A (en) * 2020-03-24 2020-06-26 北京天地玛珂电液控制系统有限公司 Valve sleeve, valve core assembly and reversing valve
CN111473013A (en) * 2020-04-26 2020-07-31 郑州煤矿机械集团股份有限公司 Electro-hydraulic multi-speed buffer valve for near-water medium
CN111911216A (en) * 2020-06-19 2020-11-10 太原理工大学 Directional flow valve with continuous flow adjusting function and control method thereof
CN113309547A (en) * 2021-04-29 2021-08-27 铁法煤业（集团）有限责任公司小青煤矿 Spraying valve group
CN114151113A (en) * 2021-10-22 2022-03-08 北京天玛智控科技股份有限公司 Linkage speed-regulating oil way for speed-regulating valve and hydraulic support
CN114165265A (en) * 2022-01-05 2022-03-11 郑州煤机液压电控有限公司 Electro-hydraulic main valve with integrated speed regulation function

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邹炳燕: "《液压与气压传动》", 31 August 2020, 中国铁道出版社有限公司 *

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