CN110937541A - Winch hydraulic system using O-shaped neutral position function reversing valve - Google Patents
Winch hydraulic system using O-shaped neutral position function reversing valve Download PDFInfo
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- CN110937541A CN110937541A CN201911387344.1A CN201911387344A CN110937541A CN 110937541 A CN110937541 A CN 110937541A CN 201911387344 A CN201911387344 A CN 201911387344A CN 110937541 A CN110937541 A CN 110937541A
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 42
- 239000003921 oil Substances 0.000 claims description 289
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
- B66D5/26—Operating devices pneumatic or hydraulic
- B66D5/28—Operating devices pneumatic or hydraulic specially adapted for winding gear, e.g. in mining hoists
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—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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- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a winch hydraulic system using an O-shaped neutral position function reversing valve, which is formed by connecting an O-shaped neutral position function reversing valve (21), a shuttle valve II (22), a load relief valve (23), a shuttle valve I (13), a balance valve group (14), a winch motor (17), a brake (18) and a hydraulic valve (19) with a pressure reducing valve (10). The invention uses the O-shaped neutral position function reversing valve to replace the prior Y-shaped neutral position function reversing valve to be used for a hydraulic control system of the winch, and adds the second shuttle valve and the unloading valve which are connected to the original valve group through simple pipelines, thereby solving the defect that a brake which is generated when the O-shaped neutral position function reversing valve is used on the hydraulic control system of the winch can not lock a hydraulic motor in time, and replacing the Y-shaped neutral position function reversing valve to complete the hydraulic transmission and control functions of the winch under the condition that the Y-shaped neutral position function reversing valve can not be used or the use is limited, and having strong adaptability and low cost.
Description
Technical Field
The invention relates to a hydraulic control system of piling machinery, in particular to a winch hydraulic system using an O-shaped neutral position function reversing valve.
Background
With the continuous development and perfection of piling machinery, a plurality of pile pressing machines are also provided with windlasses which are generally used for lifting or descending drill rods, the windlasses are driven by hydraulic motors, the existing windlasses hydraulic systems all use Y-shaped neutral position function reversing valves as main control valves, the existing windlasses hydraulic systems using the Y-shaped neutral position function reversing valves as the main control valves are shown in a schematic diagram of a figure 1, the existing windlasses hydraulic systems using the Y-shaped neutral position function reversing valves as the main control valves comprise Y-shaped neutral position function reversing valves 12, shuttle valves 13, balance valve groups 14, windlasses motors 17, brakes 18, hydraulic valves 19 and pressure reducing valves 10, when left and right pilot oil ports of the Y-shaped neutral position function reversing valves 12 have no pilot hydraulic signals, the Y-shaped neutral position function reversing valves 12 are located at a neutral position, and at the moment, two working oil ports A and B of the Y-shaped neutral position function reversing valves 12 are both communicated with oil tanks, two control ports of the balance valve group 14 have no pressure, the balance valve group can close two working oil ports C and D of the winch motor, an oil inlet and an oil outlet of the reducing valve 10 have no oil pressure, the hydraulic valve 19 is located at the left position, the brake 18 is closed and brakes the winch motor, and hydraulic oil in an oil chamber of the brake 18 flows back to the oil tank through the left position of the hydraulic valve 19.
However, sometimes, due to practical limitations (for example, the stock of the Y-type neutral position function switching valve is small, and the stock of the O-type neutral position function switching valve is large), the O-type neutral position function switching valve needs to be used as the main control valve of the hoist hydraulic system instead of the Y-type neutral position function switching valve during maintenance and replacement or production of a new machine, but there is a problem that the O-type neutral position function switching valve directly replaces the Y-type neutral position function switching valve to be used in the hoist hydraulic system: when the winch motor stops rotating and needs braking, the O-shaped middle position function reversing valve is located in the middle position, the working oil ports A and B are not communicated with an oil tank, the balance valve group 14 is in an open state, the oil pressure at the outlet of the reducing valve 10 is large, the hydraulic valve 9 cannot return to the left position, the brake 18 cannot release pressure through the hydraulic valve, and therefore the brake cannot lock the winch motor in time.
Disclosure of Invention
The invention aims to provide a winch hydraulic system using an O-shaped neutral position function reversing valve, which aims to solve the problems in the background art.
A winch hydraulic system using an O-shaped neutral position function reversing valve comprises the O-shaped neutral position function reversing valve, a shuttle valve II, a load relief valve, a shuttle valve I, a balance valve group, a winch motor, a brake, a hydraulic valve and a pressure reducing valve, wherein the O-shaped neutral position function reversing valve is provided with a working oil port A, a working oil port B and an oil return port T communicated with an oil tank1And a power oil port P connected with the oil pump1The winch motor is provided with a working oil port C and a working oil port D, the working oil port A is connected with the working oil port C through an oil way L, and the working oil port B is connected with the working oil port D through an oil way M;
the balance valve group is connected between the oil way L and the oil way M, two oil inlets of the first shuttle valve are respectively connected with the oil way L and the oil way M, and the first shuttle valve is positioned at the upstream of the balance valve group when the oil way L and the oil way M are respectively used as oil inlet pipelines of the hoisting motor;
an oil cavity of the brake is connected with an oil outlet of the pressure reducing valve through an oil way N, an oil inlet of the pressure reducing valve is connected with an oil outlet of the shuttle valve I, and the hydraulic valve is arranged on the oil way N between the brake and the pressure reducing valve;
the hydraulic valve is used for switching the oil cavity of the brake between oil inlet and oil return, and the pressure reducing valve is used for controlling oil pressure entering the oil cavity of the brake when the oil cavity of the brake is filled with oil, so that the brake is prevented from being damaged due to overhigh pressure;
the hydraulic valve is provided with an oil port G, an oil port H and an oil port I, the oil port G is connected with an oil cavity of the brake, the oil port H is connected with an oil tank, the oil port I is connected with an oil outlet of the pressure reducing valve, a right-position pilot oil port of the hydraulic valve is connected to a pipeline between the oil port I and the oil outlet of the pressure reducing valve, the oil port I is cut off when the hydraulic valve is positioned at a left position, the oil port G is communicated with the oil port H, the oil port H is cut off when the hydraulic valve is positioned at a right position, and the;
the load relief valve is provided with an oil port E and an oil port F communicated with an oil tank, the oil port E is connected to a pipeline between an oil inlet of the pressure reducing valve and an oil outlet of the shuttle valve, the oil port E is disconnected with the oil port F when the load relief valve is positioned at a left position, and the oil port E is communicated with the oil port F when the load relief valve is positioned at a right position;
two oil inlets of the second shuttle valve are respectively connected with a left pilot oil path and a right pilot oil path of the O-shaped middle position function reversing valve, an oil outlet of the second shuttle valve is connected with a left pilot oil port of the unloading valve, when the winch motor needs to stop and the O-shaped middle position function reversing valve is switched to a middle position from a left position or a right position, pilot hydraulic signals of the left pilot oil path and the right pilot oil path of the O-shaped middle position function reversing valve are cut off, the unloading valve does not act and is positioned at the right position at the moment, an oil inlet of the reducing valve is communicated with the oil tank, the hydraulic valve returns to the left position at the moment, hydraulic oil in an oil cavity of the brake returns to the oil tank through the left position of the hydraulic valve, and pressure oil on the side with higher oil pressure in the.
Further, the winch hydraulic system using the O-shaped neutral position function reversing valve comprises a safety valve and an oil supplementing valve, wherein the safety valve and the oil supplementing valve are both connected between the oil path L and the oil path M, and when the oil path L and the oil path M are respectively used as oil inlet pipelines of the winch motor, the balance valve group is both positioned at the upstream of the safety valve and the oil supplementing valve.
Preferably, the left pilot oil path and the right pilot oil path of the O-shaped neutral position function reversing valve provide pilot hydraulic signals through a hydraulic handle, and the hydraulic handle is provided with a power oil port P connected with pressure oil2And an oil return port T connected with an oil tank2。
The invention has at least the following beneficial effects:
the invention uses the O-shaped middle position function reversing valve to replace the prior Y-shaped middle position function reversing valve to be used for a hydraulic control system of the winch, and adds the shuttle valve II and the load release valve which are connected to the original valve group through simple pipelines, thereby solving the defects that the brake can not release pressure and can not lock the hydraulic motor in time when the O-shaped middle position function reversing valve is used in the middle position of the valve group generated on the hydraulic control system of the winch, and effectively replacing the Y-shaped middle position function reversing valve to complete the hydraulic transmission and control functions of the winch under the condition that the Y-shaped middle position function reversing valve can not be used or the use is limited, and having strong adaptability and low cost.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a conventional hoist hydraulic system using a Y-type neutral position function switching valve;
fig. 2 is a schematic diagram of a hoist hydraulic system using an O-type neutral position function switching valve according to a preferred embodiment of the present invention.
In the figure: 10-a pressure reducing valve, 12-Y type middle position function reversing valve, 13-a shuttle valve I, 14-a balance valve group, 17-a hoisting motor, 18-a brake, 19-a hydraulic valve, 20-a hydraulic handle, 21-O type middle position function reversing valve, 22-a shuttle valve II, 23-a load relief valve, 24-an oil tank, 25-a safety valve and 26-an oil replenishing valve.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 2, the hydraulic system of the winch using the O-type neutral position function switching valve includes an O-type neutral position function switching valve 21, a second shuttle valve 22, a load release valve 23, a first shuttle valve 13, a balance valve group 14, a safety valve 25, an oil replenishment valve 26, a winch motor 17, a brake 18, a hydraulic valve 19 and a pressure reducing valve 10, and the O-type neutral position function switching valve21 is provided with a working oil port A, a working oil port B and an oil return port T communicated with the oil tank 241And a power oil port P connected with the oil pump1The winch motor is provided with a working oil port C and a working oil port D, the working oil port A is connected with the working oil port C through an oil way L, and the working oil port B is connected with the working oil port D through an oil way M.
Two oil inlets of the first shuttle valve 13 are respectively connected with an oil path L and an oil path M, the balance valve group 14, the safety valve 25 and the oil replenishing valve 26 are respectively connected between the oil path L and the oil path M, when the oil path L and the oil path M are respectively used as oil inlet pipelines of the hoisting motor, the balance valve group 14 is positioned at the upstream of the safety valve 15 and the oil replenishing valve 26, and the first shuttle valve 13 is positioned at the upstream of the balance valve group 14.
Specifically, when the oil path L is fed with oil and the oil path M is fed with oil, the working oil port C of the hoist motor is fed with oil and the working oil port D of the hoist motor is fed with oil, the balance valve on the right side of the balance valve group 14 is opened, the hydraulic oil flowing out from the working oil port D flows back to the oil tank through the balance valve on the right side, and in addition, a part of hydraulic oil in the oil path L flows into the oil chamber of the brake through the shuttle valve i, the pressure reducing valve 10 and the hydraulic valve 19, so that the brake releases. Conversely, when the hoisting motor needs to rotate in the opposite direction, the oil way M needs to be fed with oil and the oil way L needs to be fed with oil, and the principle is the same as that of the oil way L when the oil way L is fed with oil and the oil way M returns oil.
The safety valve 25 mainly plays a role in preventing the system pressure from being too high, and the oil supplementing valve 26 is used for supplementing oil lost due to leakage of the hoisting motor and preventing the hoisting motor from being sucked empty to cause the stalling and falling of a mechanism or an object hung by the steel wire rope.
An oil cavity of the brake 18 is connected with an oil outlet of the pressure reducing valve 10 through an oil path N, an oil inlet of the pressure reducing valve 10 is connected with an oil outlet of the shuttle valve I13, and the hydraulic valve 19 is arranged on the oil path N between the brake and the pressure reducing valve 10.
The hydraulic valve is used for switching the oil cavity of the brake between oil inlet and oil return, and the pressure reducing valve is used for controlling oil pressure entering the oil cavity of the brake when the oil cavity of the brake is filled with oil, so that the brake is prevented from being damaged due to overhigh pressure.
In this embodiment, the hydraulic valve 19 is a two-position three-way hydraulic control reversing valve, the hydraulic valve is provided with an oil port G, an oil port H and an oil port I, the oil port G is connected with an oil cavity of the brake 18, the oil port H is connected with an oil tank, the oil port I is connected with an oil outlet of the pressure reducing valve, a right-position pilot oil port of the hydraulic valve is connected to a pipeline between the oil port I and the oil outlet of the pressure reducing valve, the oil port I is closed when the hydraulic valve is in a left position, the oil port G is communicated with the oil port H, the oil port H is closed when the hydraulic valve is in a right.
In this embodiment, the unloading valve 23 is a two-position two-way reversing valve with a two-position left position having a pilot control port, the unloading valve 23 is provided with an oil port E and an oil port F communicating with an oil tank, the oil port E is connected to a pipeline between an oil inlet of the pressure reducing valve 10 and an oil outlet of the shuttle valve one 13, when the unloading valve 23 is located at the left position, the oil port E is disconnected from the oil port F, and when the unloading valve 23 is located at the right position, the oil port E is connected to the oil port F.
Two oil inlets of the second shuttle valve 22 are respectively connected with a left pilot oil path and a right pilot oil path of the O-shaped middle position function reversing valve, an oil outlet of the second shuttle valve 22 is connected with a left pilot oil port of the unloading valve 23, when the winch motor needs to stop and the O-shaped middle position function reversing valve is switched to a middle position from a left position or a right position, pilot hydraulic signals of the left pilot oil path and the right pilot oil path of the O-shaped middle position function reversing valve are cut off, the unloading valve 23 does not act and is positioned at the right position at the moment, an oil inlet of the reducing valve 10 is communicated with an oil tank, the oil outlet of the reducing valve 10 does not have oil pressure to drive the hydraulic valve, the hydraulic valve 19 returns to the left position at the moment, an oil cavity of the brake 18 returns. At the moment, the pressure oil on the side with higher oil pressure in the working oil port A and the working oil port B returns to the oil tank through the shuttle valve I13 and the unloading valve 23, and the function of the pressure oil is the same as that of the Y-middle position function reversing valve.
When the motor needs to rotate, a pilot hydraulic signal is provided for the left pilot oil path or the right pilot oil path of the O-shaped middle position function reversing valve, the left pilot pressure oil or the right pilot pressure oil of the O-shaped middle position function reversing valve is divided into two paths, one path is used for driving the O-shaped middle position function reversing valve, the other path is used for driving the unloading valve 23 through the shuttle valve II 22, the unloading valve 23 is switched to the left position, namely the connection between the oil inlet of the reducing valve 10 and the oil tank is cut off, the hydraulic valve 19 is switched to the right position, the oil inlet of the oil cavity of the brake is realized, and the brake is released.
In this embodiment, the left and right pilot oil paths of the O-type neutral position function switching valve provide pilot hydraulic signals through the hydraulic handle 20, and the hydraulic handle 20 is provided with a power port P for connecting pressure oil2And an oil return port T connected with an oil tank2。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The winch hydraulic system using the O-shaped neutral position function reversing valve is characterized by comprising the O-shaped neutral position function reversing valve (21), a second shuttle valve (22), a load release valve (23), a first shuttle valve (13), a balance valve group (14), a winch motor (17), a brake (18), a hydraulic valve (19) and a pressure reducing valve (10), wherein the O-shaped neutral position function reversing valve is provided with a working oil port A and a working oil port B;
the balance valve group is connected between the oil way L and the oil way M, two oil inlets of the first shuttle valve are respectively connected with the oil way L and the oil way M, and the first shuttle valve is positioned at the upstream of the balance valve group when the oil way L and the oil way M are respectively used as oil inlet pipelines of the hoisting motor;
an oil cavity of the brake is connected with an oil outlet of the pressure reducing valve through an oil way N, an oil inlet of the pressure reducing valve is connected with an oil outlet of the shuttle valve I, and the hydraulic valve is arranged on the oil way N between the brake and the pressure reducing valve;
the hydraulic valve is used for switching the oil cavity of the brake between oil inlet and oil return, and the pressure reducing valve is used for controlling oil pressure entering the oil cavity of the brake when the oil cavity of the brake is filled with oil, so that the brake is prevented from being damaged due to overhigh pressure;
the hydraulic valve is provided with an oil port G, an oil port H and an oil port I, the oil port G is connected with an oil cavity of the brake, the oil port H is connected with an oil tank, the oil port I is connected with an oil outlet of the pressure reducing valve, a right-position pilot oil port of the hydraulic valve is connected to a pipeline between the oil port I and the oil outlet of the pressure reducing valve, the oil port I is cut off when the hydraulic valve is positioned at a left position, the oil port G is communicated with the oil port H, the oil port H is cut off when the hydraulic valve is positioned at a right position, and the;
the load relief valve is provided with an oil port E and an oil port F communicated with an oil tank, the oil port E is connected to a pipeline between an oil inlet of the pressure reducing valve and an oil outlet of the shuttle valve, the oil port E is disconnected with the oil port F when the load relief valve is positioned at a left position, and the oil port E is communicated with the oil port F when the load relief valve is positioned at a right position;
two oil inlets of the second shuttle valve are respectively connected with a left pilot oil path and a right pilot oil path of the O-shaped middle position function reversing valve, an oil outlet of the second shuttle valve is connected with a left pilot oil port of the unloading valve, when the winch motor needs to stop and the O-shaped middle position function reversing valve is switched to a middle position from a left position or a right position, pilot hydraulic signals of the left pilot oil path and the right pilot oil path of the O-shaped middle position function reversing valve are cut off, the unloading valve does not act and is positioned at the right position at the moment, an oil inlet of the reducing valve is communicated with the oil tank, the hydraulic valve returns to the left position at the moment, hydraulic oil in an oil cavity of the brake returns to the oil tank through the left position of the hydraulic valve, and pressure oil on the side with higher oil pressure in the.
2. The hoist hydraulic system using the O-type neutral position functioning reversing valve according to claim 1, further comprising a safety valve (25) and an oil replenishment valve (26), both of which are connected between the oil passage L and the oil passage M, wherein the balancing valve group is located upstream of the safety valve and the oil replenishment valve when the oil passage L and the oil passage M are used as oil supply lines of the hoist motor, respectively.
3. The hoist hydraulic system using the O-type neutral position function switching valve according to claim 1, wherein the left and right pilot oil passages of the O-type neutral position function switching valve provide pilot hydraulic signals through a hydraulic handle (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387344.1A CN110937541B (en) | 2019-12-27 | 2019-12-27 | Winch hydraulic system using O-shaped median function reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387344.1A CN110937541B (en) | 2019-12-27 | 2019-12-27 | Winch hydraulic system using O-shaped median function reversing valve |
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| Publication Number | Publication Date |
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| CN110937541A true CN110937541A (en) | 2020-03-31 |
| CN110937541B CN110937541B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911387344.1A Active CN110937541B (en) | 2019-12-27 | 2019-12-27 | Winch hydraulic system using O-shaped median function reversing valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112744690A (en) * | 2021-01-08 | 2021-05-04 | 上海电气风电集团股份有限公司 | Single-blade lifting appliance transmission device and single-blade lifting appliance |
| CN112777503A (en) * | 2021-02-23 | 2021-05-11 | 三一汽车起重机械有限公司 | Winch device, hydraulic system thereof, use method and operation machine |
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| CN201686408U (en) * | 2010-05-13 | 2010-12-29 | 卢宇 | Mechanically operated three-pump hydraulic system |
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| CN112777503A (en) * | 2021-02-23 | 2021-05-11 | 三一汽车起重机械有限公司 | Winch device, hydraulic system thereof, use method and operation machine |
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