CN110230618B - Hydraulic control two-way reversing valve, load holding module and load holding system - Google Patents
Hydraulic control two-way reversing valve, load holding module and load holding system Download PDFInfo
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- CN110230618B CN110230618B CN201910554729.6A CN201910554729A CN110230618B CN 110230618 B CN110230618 B CN 110230618B CN 201910554729 A CN201910554729 A CN 201910554729A CN 110230618 B CN110230618 B CN 110230618B
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- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
- F16K11/044—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with movable valve members positioned between valve seats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0263—Construction of housing; Use of materials therefor of lift valves multiple way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic control two-way reversing valve, a load holding module and a load holding system, and belongs to the technical field of engineering machinery hydraulic systems. The oil port A1 of the multi-way valve is connected with the oil duct A of the load holding module; the oil duct B of the load holding module is connected with a large cavity of the movable arm oil cylinder, the oil duct DR of the load holding module is connected with the oil tank, and the oil duct Pi of the load holding module is connected with a descending pilot pressure oil duct of the multi-way valve; the small cavity of the movable arm oil cylinder is connected with the B1 oil port of the multi-way valve. The area ratio of the cover pad in the hydraulic control two-way reversing valve to the pilot valve core can reach 1:64, so that the control is simple and convenient; by using the holding function of the holding valve, the internal leakage amount can be controlled to be zero, so that the load can be kept at a constant position without falling along with the change of time; the pilot-controlled two-way reversing valve plays a role in guiding the holding valve, so that the small cone valve core frequently acts under pilot pressure, and phenomena such as fracture and the like are avoided.
Description
Technical Field
The invention relates to the technical field of engineering machinery hydraulic systems, in particular to a hydraulic control two-way reversing valve, a load holding module and a load holding system, which are used for holding the load of an actuating mechanism.
Background
The engineering machinery has very wide application, and the complexity of the hydraulic system is determined by different applications and complex working conditions. For many hydraulic systems, where the actuator is required to remain constant at a certain position, the following is common:
1. For hydraulic systems requiring high-end and accurate, this is achieved by means of balancing valves;
2. the fit clearance between the valve rod and the valve core of the multi-way valve is controlled, and the multi-way valve is realized by utilizing the median function of the multi-way valve;
3. The actuating mechanism is added with a hydraulic lock.
In practical working conditions, the scheme has the following problems:
The scheme 1 is realized through a balance valve in the system, the requirement of the scheme is high in precision and accurate in position, the scheme is suitable for engineering machinery of the type of overhead working truck and telescopic boom fork loading machine, and the scheme is not practical and has high cost for small and medium tonnage diggers and loaders;
Scheme 2 is a very common scheme for small and medium tonnage diggers and loaders, and is realized by indirectly controlling the leakage amount by controlling the fit clearance between a valve rod and a valve body center hole. Theoretically, there is a leakage amount when there is a gap, and there is a decrease in the actuator over time when there is a leakage, which may bring a bad experience to the user; if the clearance between the valve rod and the valve body is made small enough, a valve can be blocked during the action of the actuating mechanism, particularly in a high-pressure state, faults can be easily brought to the hydraulic system, and other elements of the hydraulic system can be damaged to different degrees. For the hydraulic valve, difficulties are brought to processing the valve body and the valve rod, difficulties are increased to assembly, fault points are increased to a test, and accordingly the qualification rate is reduced.
Scheme 3 is unsuitable for a frequently operated hydraulic system, and under the condition of sufficiently large load, the hydraulic lock can not be opened and can not be accurately positioned, and the explosion of the pipe is easy to occur-! For pilot-controlled unidirectional hydraulic locks, frequent opening and closing of the small cone valve cores under high pressure can easily lead to cone valve core breakage.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hydraulic control two-way reversing valve, a load holding module and a load holding system.
The invention is realized by the following technical scheme: a hydraulic control two-way reversing valve comprises an end cover, wherein a step mounting hole is formed in the end cover, and an oil passage a, an oil passage b and an oil passage DR which are communicated with the step mounting hole are formed in the side surface of the end cover;
a valve sleeve is arranged in the end cover step mounting hole, and a valve body I is fixedly arranged at the outer end of the end cover step mounting hole;
the valve body I is provided with a step hole at the axle center, and a valve seat and a cover pad are sequentially arranged in the step hole of the valve body I from outside to inside; the valve seat is fixedly connected with the valve body I, and an oil duct Pi penetrating through the valve seat is formed in the axis of the valve seat; the cover pad is in sliding fit with the step hole of the valve body I; a spring I is arranged between the inner end of the cover pad and the bottom of the step hole of the valve body I;
the reversing valve core is slidably arranged in the valve sleeve, and the upper end of the reversing valve core is matched with the inner wall of the valve sleeve in a conical surface manner; a spring II is arranged between the lower end of the reversing valve core and the bottom of the step mounting hole of the end cover;
The upper end of the valve sleeve is provided with a through hole communicated with the upper end of the reversing valve core, and a pilot valve core is slidably arranged in the through hole of the valve sleeve; the upper end of the pilot valve core extends out of the through hole at the upper end of the valve sleeve, and the upper end of the pilot valve core is opposite to the cover pad;
when the upper end of the reversing valve core is tightly matched with the inner wall of the valve sleeve, the oil duct a and the oil duct b are communicated; when the cover pad presses down the pilot valve core to push the upper end of the reversing valve core to leave the conical surface of the inner wall of the valve sleeve, the oil duct a is communicated with the oil duct DR.
Preferably: the lower end of the valve body I is provided with external threads, and the outer end of the end cover step mounting hole is provided with external threads; the lower end of the valve body I is installed in the step installation hole of the end cover through threaded connection; an O-shaped ring III is arranged between the outer end of the end cover step mounting hole and the valve body I.
Preferably: the upper end of the valve sleeve is provided with a circumferential baffle, and the valve sleeve baffle is propped against a step in the end cover step mounting hole; the lower end of the valve body I is tightly pressed on the valve sleeve baffle.
Preferably: two mounting grooves are formed in the outer circumferential surface of the valve sleeve and are respectively arranged on two sides of the oil duct b; an O-shaped ring I and a check ring I are arranged in the valve sleeve mounting groove on the upper side of the oil duct b, and an O-shaped ring II and a check ring II are arranged in the valve sleeve mounting groove on the lower side of the oil duct b.
Preferably: the lower end of the valve seat is provided with external threads, and the outer end of the stepped hole of the valve body I is provided with external threads; the lower end of the valve seat is arranged in the step hole of the valve body I through threaded connection; an O-shaped ring IV is arranged between the outer end of the stepped hole of the valve body I and the valve seat.
A load holding module further comprising a holding valve;
The holding valve comprises a valve body II, wherein an oil duct c, an oil duct d, an oil duct A and an oil duct B are formed in the valve body II; the inner end of the oil duct d is connected with the middle part of the oil duct B, and the inner ends of the oil duct c, the oil duct A and the oil duct B are intersected;
the oil duct c is a stepped hole, and a cover plate, a spring III and a retaining valve core are sequentially arranged in the oil duct c from outside to inside; the periphery of the cover plate is connected with the inner wall of the oil duct c in a matched manner, a through hole is formed in the axis of the cover plate, and the inner end of the cover plate abuts against a step in the oil duct c; the outer end of the holding valve core is provided with a blind hole, the inner end of the spring III is positioned in the blind hole of the holding valve core, and the outer end of the spring III is sleeved on a boss at the inner end of the cover plate; the inner end of the holding valve core is a conical surface, and the conical surface of the inner end of the holding valve core is matched and abutted against the inner end of the oil duct A; a circle of sinking grooves are formed in the circumferential surface of the inner end of the holding valve core, and the sinking grooves of the inner end of the holding valve core are opposite to the inner end of the oil duct B;
the oil duct c is communicated with an oil duct a of the hydraulic control two-way reversing valve;
And the oil duct d is communicated with the oil duct b of the hydraulic control two-way reversing valve.
Preferably: the cover plate is characterized in that an installation groove is formed in the circumferential surface of the cover plate, and an O-shaped ring V and a check ring V are installed in the installation groove of the cover plate.
Preferably: the outer ends of the oil duct a and the oil duct b on the same side face of the end cover are provided with mounting grooves, and O-shaped rings VI are arranged in the mounting grooves at the outer ends of the oil duct a and the oil duct b; the side surface of the end cover is attached to the side surface of the valve body II, and the end cover is connected with the valve body II through a screw; and the oil channels c and d on the same side surface of the valve body II are butted with the outer ends of the oil channels a and b.
The load maintaining system also comprises a multi-way valve and a movable arm oil cylinder;
An oil port A1 of the multi-way valve is connected with an oil duct A of the load holding module; the oil duct B of the load holding module is connected with a large cavity of the movable arm oil cylinder, the oil duct DR of the load holding module is connected with an oil tank, and the oil duct Pi of the load holding module is connected with a descending pilot pressure oil duct of the multi-way valve; and a small cavity of the movable arm oil cylinder is connected with a B1 oil port of the multi-way valve.
Compared with the prior art, the invention has the beneficial effects that:
1, the area ratio of a cover pad in the hydraulic control two-way reversing valve to a pilot valve core can reach 1:64, which means that the pilot pressure is 3MPA, a load with the pressure of 192MPA can be opened, and the control is simple and convenient;
2, utilizing the holding function of the holding valve to apply slide valve type pilot stage control to the holding valve, and simultaneously, as the sealing function of the one-way valve is arranged in the hydraulic control two-way reversing valve, the internal leakage quantity can be controlled to be zero, so that the load can be kept at a constant position and does not drop along with the change of time;
And 3, the pilot-operated two-way reversing valve plays a role in pilot-operated level of the holding valve, so that the small cone valve core frequently acts under pilot pressure, and phenomena such as fracture and the like are avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic diagram of a pilot operated two-way reversing valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a load holding module according to a second embodiment of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is an enlarged view of the retention valve of FIG. 2;
FIG. 5 is a schematic diagram of a three load holding system according to an embodiment of the present invention;
In the figure: 1-valve seat; 2-O-shaped ring IV; 3-a cover pad; 4-spring I; 5-a valve body I; 6, guiding a valve core; 7-O-shaped ring III; 8-valve sleeve; 9-O-shaped ring VI; 10-O-shaped ring I; 11-a retainer ring I; 12-O-shaped ring II; 13-a retainer ring II; 14-a gasket; 15-reversing valve core; 16-spring II; 17-end caps; 18-valve body II; 19-holding the valve core; 20 spring III; 21-cover plate; a 22-O-ring V; 23-retainer ring V.
Detailed Description
The following are specific embodiments of the present invention, which will be further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an end cover 17 is square, a vertically downward step mounting hole is formed in the upper end surface of the end cover 17, oil channels a and b communicating with the step mounting hole are formed in the left side surface of the end cover 17, and an oil channel DR communicating with the step mounting hole is formed in the right side surface of the end cover 17.
The lower end of the valve body I5 is provided with external threads, the outer end of the step mounting hole of the end cover 17 is provided with external threads, the lower end of the valve body I5 is installed in the step mounting hole of the end cover 17 through threaded connection, and an O-shaped ring III 7 is installed between the outer end of the step mounting hole of the end cover 17 and the valve body I5. The axle center of the valve body I5 is provided with a step hole, and the valve seat 1 and the cover pad 3 are sequentially arranged in the step hole of the valve body I5 from outside to inside. The axial center of the valve seat 1 is provided with an oil duct Pi penetrating through the valve seat 1. The lower end of the valve seat 1 is provided with external threads, the outer end of the stepped hole of the valve body I5 is provided with external threads, the lower end of the valve seat 1 is installed in the stepped hole of the valve body I5 through threaded connection, and an O-shaped ring IV 2 is installed between the outer end of the stepped hole of the valve body I5 and the valve seat 1. The cover pad 3 is in sliding fit with the step hole of the valve body I5, and a spring I4 is arranged between the inner end of the cover pad 3 and the bottom of the step hole of the valve body I5. The spring I4 applies an upward force to the cover pad 3, and keeps the upper end of the cover pad 3 against the lower end of the valve seat 1.
The valve sleeve 8 is arranged at the middle lower part of the step mounting hole of the end cover 17, the upper end of the valve sleeve 8 is provided with a circumferential baffle, the baffle of the valve sleeve 8 is propped against the step in the step mounting hole of the end cover 17, and the lower end of the valve body I5 is tightly pressed on the baffle of the valve sleeve 8, so that the positioning of the valve sleeve 8 is completed. Two mounting grooves are formed in the outer circumferential surface of the valve sleeve 8 and are respectively arranged on two sides of the oil duct b; an O-shaped ring I10 and a check ring I11 are arranged in the valve sleeve 8 mounting groove on the upper side of the oil duct b, and an O-shaped ring II 12 and a check ring II 13 are arranged in the valve sleeve 8 mounting groove on the lower side of the oil duct b.
The reversing valve core 15 is slidably arranged in the valve sleeve 8, and the upper end of the reversing valve core 15 is matched with the inner wall of the upper end of the valve sleeve 8 in a conical surface. The lower end of the reversing valve core 15 is sleeved with a gasket 14, and the gasket 14 is propped against a step at the lower end of the reversing valve core 15; the spring II 16 is sleeved at the lower end of the reversing valve core 15, the upper end of the spring II 16 abuts against the gasket 14, and the lower end of the spring II 16 abuts against the bottom surface of the step mounting hole of the end cover 17. The spring II 16 provides an upward movement force for the reversing valve core 15, so that the conical surface at the upper end of the reversing valve core 15 is kept to be matched with the conical surface at the upper end of the valve sleeve 8, the conduction with the oil duct DR is prevented, and the function of the one-way valve is equivalent.
The upper end of the valve sleeve 8 is provided with a through hole communicated with the upper end of the reversing valve core 15, and a pilot valve core 6 is slidably arranged in the through hole of the valve sleeve 8. The upper end of the pilot valve core 6 extends out of the through hole at the upper end of the valve sleeve 8, and the upper end of the pilot valve core 6 is opposite to the cover pad 3. When the upper end of the reversing valve core 15 is tightly matched with the inner wall of the valve sleeve 8, the oil channels a and b are communicated; when the oil duct Pi is communicated with oil, the cover pad 3 is pushed to slide downwards, and the cover pad 3 pushes the pilot valve core 6 downwards to push the upper end of the reversing valve core 15 to leave the conical surface of the inner wall of the valve sleeve 8, the oil duct a is communicated with the oil duct DR.
Example two
On the basis of the first embodiment, as shown in fig. 2 to 4, the load holding module mainly comprises a pilot operated two-way reversing valve and a holding valve.
The holding valve comprises a square valve body ii 18. The left side of the valve body II 18 is provided with an oil duct c and an oil duct d, the upper side of the valve body II 18 is provided with an oil duct B, and the right side of the valve body II 18 is provided with an oil duct A. The inner end of the oil duct d is connected with the middle part of the oil duct B, and the inner ends of the oil duct c, the oil duct A and the oil duct B are intersected.
The oil duct c is a stepped hole, and a cover plate 21, a spring III 20 and a holding valve core 19 are sequentially arranged in the oil duct c from outside to inside. The peripheral surface of the cover plate 21 is connected with the inner wall of the oil duct c in a matched mode, a mounting groove is formed in the peripheral surface of the cover plate 21, and an O-shaped ring V22 and a check ring V23 are mounted in the mounting groove of the cover plate 21. The inner end of the cover plate 21 abuts against the step in the oil duct c to realize the inner end positioning, and the outer end of the cover plate depends on the end face of the night sky two-way hydraulic control valve to limit. The outer end of the holding valve core 19 is provided with a blind hole, the inner end of the spring III 20 is positioned in the blind hole of the holding valve core 19, and the outer end of the spring III 20 is sleeved on a boss at the inner end of the cover plate 21. The inner end of the holding valve core 19 is a conical surface, and the conical surface of the inner end of the holding valve core 19 is matched and abutted against the inner end of the oil duct A under the action of the spring III 20 on the left side, so that the cut-off of the oil duct A is realized. A circle of sinking grooves are formed in the circumferential surface of the inner end of the holding valve core 19, and the sinking grooves of the inner end of the holding valve core 19 are opposite to and communicated with the inner end of the oil duct B.
The outer ends of the oil duct a and the oil duct b on the side surface of the end cover 17 are provided with mounting grooves, and O-shaped rings VI 9 are arranged in the mounting grooves at the outer ends of the oil duct a and the oil duct b; the side of the end cover 17 is attached to the side of the valve body II 18, and the end cover 17 is connected with the valve body II 18 through screws, so that the oil channels c and d on the valve body II 18 are butted with the outer ends of the oil channels a and b.
Example III
On the basis of the second embodiment, as shown in fig. 5, the load holding system includes a load holding module, a multiplex valve, and a boom cylinder. The oil port A1 of the multi-way valve is connected with the oil duct A of the load holding module; the oil duct B of the load holding module is connected with a large cavity of the movable arm oil cylinder, the oil duct DR of the load holding module is connected with the oil tank, and the oil duct Pi of the load holding module is connected with a descending pilot pressure oil duct of the multi-way valve; the small cavity of the movable arm oil cylinder is connected with the B1 oil port of the multi-way valve.
Lifting working condition of movable arm oil cylinder:
The lifting position of the movable arm oil cylinder is given with pilot pressure, the principle of the multi-way valve moves rightwards, pressure oil passes through a port A1 of the multi-way valve to a port A of a holding valve in the load holding module from a port P of the multi-way valve, pushes a holding valve core 19 in the holding valve open to a port B of the holding valve in the load holding module, then enters a large cavity of the movable arm oil cylinder, and pushes the movable arm oil cylinder to move upwards;
meanwhile, small cavity oil of the movable arm oil cylinder returns to an oil tank T port through a multi-way valve B1 port to form oil circuit circulation.
The holding valve core 19 in the holding valve can only be opened, because the spring III 20 of the holding valve has small rigidity, as long as the pressure is larger than the force of the spring III 20, meanwhile, the oil in the spring cavity in the holding valve flows to the hole a of the hydraulic control two-way reversing valve through the oil duct c of the cover plate 21 in the holding valve, flows to the hole B of the hydraulic control two-way reversing valve through the inner hole of the reversing valve core 15 in the hydraulic control two-way reversing valve, and is communicated with the port B of the holding valve through the hole d of the holding valve to form oil circuit circulation.
Boom cylinder lowering operation:
The movable arm oil cylinder descends, namely the multi-way valve descends to give pilot pressure, the multi-way valve principle moves leftwards, and pressure oil passes through a multi-way valve P port and a multi-way valve B1 port to a small cavity of the movable arm oil cylinder to push the movable arm oil cylinder to move downwards; meanwhile, the large cavity of the movable arm oil cylinder is connected to the port B of the holding valve in the load holding module, the holding valve core 19 in the holding valve is opened due to the area difference, then connected to the port A of the holding valve in the load holding module, and then returned to the port T of the oil tank through the port A1 of the multi-way valve, so that oil circuit circulation is formed.
The holding valve core 19 in the holding valve is opened due to the area difference, and the Pi port in the pilot-operated two-way reversing valve is connected with the pilot pressure of the descending position of the multi-way valve, the DR port in the pilot-operated two-way reversing valve is connected with the oil drain port of the oil tank, and when the pilot pressure of the pilot-operated two-way reversing valve descends, the pilot pressure pushes the cover gasket 3 in the pilot-operated two-way reversing valve, the pilot valve core 6 is pushed by the spring 4, and the reversing valve core 15 is further moved downwards, so that the unidirectional conical surfaces of the reversing valve core 15 and the valve sleeve 8 are sealed and opened;
the oil in the spring cavity in the holding valve flows to the hole a of the hydraulic control two-way reversing valve through the hole c of the cover plate 21 in the holding valve, and flows to the DR port oil return tank through the sealing part of the one-way conical surface of the inner hole of the reversing valve core 15;
the area difference of the holding valve spool 19 in the holding valve is opened;
Simultaneously, the reversing valve core 15 in the hydraulic control two-way reversing valve moves downwards, so that the gear of the reversing valve core 15 and the valve sleeve 8 is closed.
The movable arm cylinder keeps working condition:
when the boom cylinder is kept at a certain constant position
The multi-way valve has no pilot pressure, the pressure of the large cavity of the movable arm oil cylinder is transmitted to the port B of the holding valve in the load holding module due to the dead weight of the movable arm oil cylinder and the downward inertia of the heavy object, and the holding valve core 19 is pushed by the spring 20 in the holding valve to form conical surface seal, so that an oil way cannot be communicated with the port A; simultaneously, the port d, the port b, the port a and the port c are communicated, but no oil flows due to the fact that the conical surface seal of the valve core 19 is kept, meanwhile, no oil flows due to the fact that the unidirectional conical surface seal of the reversing valve core 15 and the valve sleeve 8 in the hydraulic control two-way reversing valve is also kept, and the sealing at the position is tighter as the load is larger; because the area ratio of the cover pad to the pilot spool in the pilot-controlled two-way reversing valve is 1:64, meaning the pilot pressure is 3MPA, a load with a pressure of 192MPA can be opened.
Claims (9)
1. A hydraulic control two-way reversing valve comprises an end cover (17), wherein a step mounting hole is formed in the end cover (17), and an oil duct a, an oil duct b and an oil duct DR which are communicated with the step mounting hole are formed in the side face of the end cover (17);
the method is characterized in that:
a valve sleeve (8) is arranged in the step mounting hole of the end cover (17), and a valve body I (5) is fixedly arranged at the outer end of the step mounting hole of the end cover (17);
The valve body I (5) is provided with a step hole at the axle center, and a valve seat (1) and a cover pad (3) are sequentially arranged in the step hole of the valve body I (5) from outside to inside; the valve seat (1) is fixedly connected with the valve body I (5), and an oil duct Pi penetrating through the valve seat (1) is formed in the axis of the valve seat (1); the cover pad (3) is in sliding fit with the step hole of the valve body I (5); a spring I (4) is arranged between the inner end of the cover pad (3) and the bottom of the step hole of the valve body I (5);
A reversing valve core (15) is slidably arranged in the valve sleeve (8), and the upper end of the reversing valve core (15) is matched with the inner wall of the valve sleeve (8) in a conical surface; a spring II (16) is arranged between the lower end of the reversing valve core (15) and the bottom of the step mounting hole of the end cover (17);
The upper end of the valve sleeve (8) is provided with a through hole communicated with the upper end of the reversing valve core (15), and a pilot valve core (6) is slidably arranged in the through hole of the valve sleeve (8); the upper end of the pilot valve core (6) extends out of a through hole at the upper end of the valve sleeve (8), and the upper end of the pilot valve core (6) is opposite to the cover pad (3);
when the upper end of the reversing valve core (15) is tightly matched with the inner wall of the valve sleeve (8), the oil duct a and the oil duct b are communicated; when the cover pad (3) presses down the pilot valve core (6) to push the upper end of the reversing valve core (15) to leave the conical surface of the inner wall of the valve sleeve (8), the oil duct a is communicated with the oil duct DR.
2. The hydraulically controlled two-way reversing valve of claim 1, wherein: the lower end of the valve body I (5) is provided with external threads, and the outer end of the step mounting hole of the end cover (17) is provided with external threads; the lower end of the valve body I (5) is arranged in a step mounting hole of the end cover (17) through threaded connection; an O-shaped ring III (7) is arranged between the outer end of the step mounting hole of the end cover (17) and the valve body I (5).
3. The hydraulically controlled two-way reversing valve of claim 2, wherein: the upper end of the valve sleeve (8) is provided with a circumferential baffle, and the baffle of the valve sleeve (8) is propped against a step in a step mounting hole of the end cover (17); the lower end of the valve body I (5) is tightly pressed on the valve sleeve (8) gear.
4. The hydraulically controlled two-way reversing valve of claim 1, wherein: two mounting grooves are formed in the outer circumferential surface of the valve sleeve (8), and the two mounting grooves are respectively arranged on two sides of the oil duct b; an O-shaped ring I (10) and a check ring I (11) are arranged in a valve sleeve (8) mounting groove on the upper side of the oil duct b, and an O-shaped ring II (12) and a check ring II (13) are arranged in a valve sleeve (8) mounting groove on the lower side of the oil duct b.
5. The hydraulically controlled two-way reversing valve of claim 1, wherein: the lower end of the valve seat (1) is provided with external threads, and the outer end of the stepped hole of the valve body I (5) is provided with external threads; the lower end of the valve seat (1) is arranged in a step hole of the valve body I (5) through threaded connection; an O-shaped ring IV (2) is arranged between the outer end of the step hole of the valve body I (5) and the valve seat (1).
6. A load holding module employing the pilot operated two-way reversing valve of any one of claims 1 to 5, characterized in that:
also includes a holding valve;
The holding valve comprises a valve body II (18), and an oil duct c, an oil duct d, an oil duct A and an oil duct B are formed in the valve body II (18); the inner end of the oil duct d is connected with the middle part of the oil duct B, and the inner ends of the oil duct c, the oil duct A and the oil duct B are intersected;
The oil duct c is a stepped hole, and a cover plate (21), a spring III (20) and a holding valve core (19) are sequentially arranged in the oil duct c from outside to inside; the circumferential surface of the cover plate (21) is connected with the inner wall of the oil duct c in a matching way, a through hole is formed in the axis of the cover plate (21), and the inner end of the cover plate (21) abuts against a step in the oil duct c; the outer end of the holding valve core (19) is provided with a blind hole, the inner end of the spring III (20) is positioned in the blind hole of the holding valve core (19), and the outer end of the spring III (20) is sleeved on a boss at the inner end of the cover plate (21); the inner end of the holding valve core (19) is a conical surface, and the conical surface at the inner end of the holding valve core (19) is matched and abutted against the inner end of the oil duct A; a circle of sinking grooves are formed in the circumferential surface of the inner end of the holding valve core (19), and the sinking grooves of the inner end of the holding valve core (19) are opposite to the inner end of the oil duct B;
the oil duct c is communicated with an oil duct a of the hydraulic control two-way reversing valve;
And the oil duct d is communicated with the oil duct b of the hydraulic control two-way reversing valve.
7. The load holding module of claim 6, wherein: the circumference of the cover plate (21) is provided with a mounting groove, and an O-shaped ring V (22) and a retainer ring V (23) are arranged in the mounting groove of the cover plate (21).
8. The load holding module of claim 6, wherein: the outer ends of the oil duct a and the oil duct b on the same side face of the end cover (17) are provided with mounting grooves, and O-shaped rings VI (9) are arranged in the mounting grooves at the outer ends of the oil duct a and the oil duct b; the side surface of the end cover (17) is attached to the side surface of the valve body II (18), and the end cover (17) is connected with the valve body II (18) through a screw; the oil channels c and d on the same side face of the valve body II (18) are butted with the outer ends of the oil channels a and b.
9. A load holding system employing the load holding module of any one of claims 6 to 8, characterized in that:
The hydraulic control system also comprises a multi-way valve and a movable arm oil cylinder;
An oil port A1 of the multi-way valve is connected with an oil duct A of the load holding module; the oil duct B of the load holding module is connected with a large cavity of the movable arm oil cylinder, the oil duct DR of the load holding module is connected with an oil tank, and the oil duct Pi of the load holding module is connected with a descending pilot pressure oil duct of the multi-way valve; and a small cavity of the movable arm oil cylinder is connected with a B1 oil port of the multi-way valve.
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| CN110230618B true CN110230618B (en) | 2024-05-28 |
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| CN112879365B (en) * | 2021-01-19 | 2022-10-14 | 龙工（上海）精工液压有限公司 | Load holding valve for excavator |
| CN113124012B (en) * | 2021-04-06 | 2022-05-27 | 中联重科股份有限公司 | Load holding valve and construction machine |
| CN113898626B (en) * | 2021-08-31 | 2023-11-07 | 徐工集团工程机械股份有限公司 | Load holding device and load holding system |
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| CN110230618A (en) | 2019-09-13 |
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