CN108561352A - Prefill valve and quarry tipper hydraulic system - Google Patents
Prefill valve and quarry tipper hydraulic system Download PDFInfo
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- CN108561352A CN108561352A CN201810311113.1A CN201810311113A CN108561352A CN 108561352 A CN108561352 A CN 108561352A CN 201810311113 A CN201810311113 A CN 201810311113A CN 108561352 A CN108561352 A CN 108561352A
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- Prior art keywords
- valve
- hydraulic
- hydraulic fluid
- fluid ports
- oil
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging 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
-
- 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
- F15B13/027—Check 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
-
- 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
- F15B2211/20576—Systems with pumps with multiple 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to quarry tipper hydraulic systems, to solve the problems, such as that constant-pressure variable system hoisting system impacts big, high failure rate on existing quarry tipper；A kind of quarry tipper hydraulic system, prefill valve, LS pressure-control valves, the second hydraulic-controlled switch valve and solenoid directional control valve are provided；Constant displacement pump is by prefill valve to accumulator filling liquid and to lifting valve fuel feeding, load-sensitive pump to steering fuel feeding and in lifting by the second hydraulic-controlled switch valve to lifting valve fuel feeding, when elevating ram extend out to lifting stroke end position, solenoid directional control valve the second hydraulic-controlled switch valve of control blocks load-sensitive and pumps to lifting valve fuel feeding.The hydraulic system structure is simple, handling good, the hoisting system stroke end impact of steering is effectively controlled.
Description
Technical field
The present invention relates to a kind of hydraulic techniques, more specifically to a kind of prefill valve and quarry tipper hydraulic system.
Background technology
Existing quarry tipper variable delivery hydraulic system generally has load sensitive system and constant-pressure variable system, variable part
It is generally used for steering, and hoisting system is mostly quantitative system.Lifting hydraulic system often by lifting pump, lifting valve, balanced valve,
The elements such as pilot valve (or electromagnetism handle), Multi-stage cylinder form, and steering hydraulic system is often by steering pump, turning control cell, accumulation of energy
The elements such as device, steering cylinder form.Braking system is made of elements such as brake valve, brake clamp, accumulators.Current majority producers
Mine car is all to use constant-pressure variable system.
Typical constant-pressure variable system, there are some technical deficiencies：
(1) hoisting system control is complicated, and lifting part is in such a way that electrichydraulic control is combined, control valve and main valve all phases
To complexity, and element is more, high failure rate.
(2) constant pressure pump is that accumulator supplements fluid in real time, and the swash plate of pump acts frequently, and the service life of pump can be by certain shadow
It rings.
(3) since steering is accumulator in fuel feeding, and the EF mouths of flux amplification valve block, and steering manipulation is not
It is good.
(4) hoisting system is without hydraulic stop, and only with mechanical position limitation, the impact of oil cylinder stroke terminal is big.
(5) since lifting pilot system is to use solenoid directional control valve control mode, hoisting system is caused to start impact big.
Invention content
The technical problem to be solved by the present invention is to be directed to constant-pressure variable system hoisting system on existing quarry tipper to impact
Greatly, the problem of high failure rate, and a kind of prefill valve and quarry tipper hydraulic system are provided, the hydraulic system structure is simple, turns
It is effectively controlled to handling good, the hoisting system stroke end impact of system.
The present invention is to realize that the technical solution of its purpose is such：There is provided a kind of prefill valve, it is characterised in that have and use
In with the XP hydraulic fluid ports of external oil circuit connection, C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports, oil return opening, X2 hydraulic fluid ports, and include first single
To valve, the second check valve, filling liquid switch valve, unloading valve, hydraulic-controlled switch valve；
The oil inlet end of second check valve is connect with D hydraulic fluid ports, and the oil outlet end of the first check valve is connect with F hydraulic fluid ports；Described first
The oil inlet end and XP hydraulic fluid ports of check valve are connect with the oil outlet end of the second check valve；
The hydraulic-controlled switch valve is connected between C hydraulic fluid ports and the oil outlet end of the second check valve, the hydraulic control end of hydraulic-controlled switch valve
It is connect with X2 hydraulic fluid ports；
The oil inlet end and control terminal of the filling liquid switch valve are connect with D hydraulic fluid ports, and the spring cavity of filling liquid switch valve is through damping
Hole is connect with oil inlet end, and the oil outlet end of filling liquid switch valve is connect with E hydraulic fluid ports；
The oil inlet end of unloading valve is connect with the spring cavity of filling liquid switch valve, and the control terminal of unloading valve goes out with the second check valve
Oily end connection, the oil outlet end of unloading valve are connect with oil return opening.
Further, in above-mentioned prefill valve, be additionally provided between XP hydraulic fluid ports and oil return opening fuel outlet valve and or overflow valve.
When fuel outlet valve and overflow valve are all arranged, fuel outlet valve and overflow valve are connected in parallel between XP hydraulic fluid ports and oil return opening.
Further, in above-mentioned prefill valve, the fuel outlet valve includes being connected to electromagnetic switch between XP hydraulic fluid ports and oil return opening
Valve and or manual switch valve.
The present invention is to realize that the technical solution of its purpose is such：A kind of quarry tipper hydraulic system is provided, including
It brake fluid system, fluid-link steering control mechanism and steering cylinder connected to it, hydraulic lifting control mechanism and is connected thereto
Elevating ram, load-sensitive pump, constant displacement pump, accumulator, hydraulic oil container；The fluid-link steering control mechanism includes and steering oil
The flux amplification valve of cylinder connection and the steering gear being connect with flux amplification valve；The hydraulic lifting control mechanism includes and lifting is oily
The lifting valve of cylinder connection and the pilot valve being connect with lifting valve；The oil inlet of the constant displacement pump and load-sensitive pump is and hydraulic oil
Case connects；Characterized by further comprising prefill valve above-mentioned and LS pressure-control valves, the second hydraulic-controlled switch valve and electromagnetic switch
Valve；
The oil return opening of the prefill valve is connected with hydraulic tank, the brake pressure oil oil inlet of F hydraulic fluid ports and brake fluid system
End connection, XP hydraulic fluid ports are connect with accumulator, the pressure oil inlet connection of E hydraulic fluid ports and lifting valve, the oil outlet of D hydraulic fluid ports and constant displacement pump
The oil outlet of connection, C hydraulic fluid ports and load-sensitive pump is connect with the pressure oil inlet of flux amplification valve；
The oil inlet of second hydraulic-controlled switch valve is connect with the oil outlet that load-sensitive pumps, and the second hydraulic-controlled switch valve goes out
The pressure oil inlet of hydraulic fluid port and lifting valve connects, the hydraulic control of the hydraulic control end hydraulic fluid port and LS pressure-control valves of the second hydraulic-controlled switch valve
It holds, connected through lifting guide's output end of solenoid directional control valve and pilot valve after the interconnection of the lifting pilot control end of lifting valve,
When the hydraulic control end hydraulic fluid port of the second hydraulic-controlled switch valve have pilot pressure signal when described in the second hydraulic-controlled switch valve oil inlet with go out
Hydraulic fluid port is connected；
The pump intake pressure that a hydraulic fluid ports of the LS pressure-control valves are pumped with the X2 hydraulic fluid ports and load-sensitive of the prefill valve simultaneously
Signaling interface (X12) connects, and the b hydraulic fluid ports of the LS pressure-control valves and the LS2 hydraulic fluid ports of steering gear connect, the LS pressure control
The c hydraulic fluid ports of valve are connect with the LS1 hydraulic fluid ports that load-sensitive pumps, and the d hydraulic fluid ports of the LS pressure-control valves are connected with hydraulic tank, and work as institute
When the hydraulic control end for stating LS pressure-control valves has pilot pressure signal, a hydraulic fluid ports are connected with c hydraulic fluid ports, when the LS pressure-control valves
Hydraulic control end when not having pilot pressure signal, b hydraulic fluid ports are connected with c hydraulic fluid ports, the cut-off of a hydraulic fluid ports；
When elevating ram is close to lifting stroke end position, the solenoid directional control valve is in rest position；Load-sensitive
There is the pump intake pressure signaling interface of pump hydraulic-controlled switch valve when pressure output to be in cut-off position.
Further, in above-mentioned quarry tipper hydraulic system, second hydraulic-controlled switch valve include pilot operated directional control valve and
Switch valve is inserted, the hydraulic control end of the pilot operated directional control valve is connect with hydraulic control end hydraulic fluid port, a hydraulic fluid ports of pilot operated directional control valve and the inserting
The oil inlet end of switch valve is connect with oil inlet, time of the b hydraulic fluid ports of pilot operated directional control valve and the hydraulic-controlled switch valve for connecting hydraulic oil container
Hydraulic fluid port connects, and the c hydraulic fluid ports of pilot operated directional control valve are connect with the hydraulic control end of inserting switch valve, insert the oil outlet end and oil outlet of switch valve
Connection；When hydraulic control end hydraulic fluid port has pilot pressure signal, the b hydraulic fluid ports of pilot operated directional control valve are connected with c hydraulic fluid ports, and the cut-off of a hydraulic fluid ports is inserted
The oil inlet end of dress switch valve is connected with oil outlet end, when hydraulic control end, hydraulic fluid port does not have pilot pressure signal, a hydraulic fluid ports of pilot operated directional control valve
It is connected with c hydraulic fluid ports, the oil inlet end and oil outlet end for inserting switch valve end.
Further, in above-mentioned quarry tipper hydraulic system, the solenoid directional control valve has oil inlet, oil outlet, returns
Lifting guide's output end of hydraulic fluid port, oil inlet and pilot valve connects, and oil outlet is oily with the hydraulic control end of the second hydraulic-controlled switch valve simultaneously
Mouth, the hydraulic control end of LS pressure-control valves, lifting valve lifting pilot control end connect simultaneously, oil return opening is connected with hydraulic tank,
When the solenoid directional control valve is in cut-off position, oil outlet is connected with oil return opening.
Further, further include guide oil source valve in above-mentioned quarry tipper hydraulic system, the guide oil source valve into
The XP hydraulic fluid ports of hydraulic fluid port and prefill valve connect, and the oil outlet of guide oil source valve and the oil inlet of pilot valve connect.
Further, in above-mentioned quarry tipper hydraulic system, the flow oil outlet more than needed of the flux amplification valve and institute
State the oil inlet connection of lifting valve.
The present invention is to realize that the technical solution of its purpose is such：A kind of quarry tipper hydraulic system, including hydraulic pressure
Braking system, fluid-link steering control mechanism and steering cylinder connected to it, hydraulic lifting control mechanism and act connected to it
Oil-lifting jar, load-sensitive pump, constant displacement pump, accumulator, hydraulic oil container；The fluid-link steering control mechanism includes connecting with steering cylinder
The flux amplification valve connect and the steering gear being connect with flux amplification valve；The hydraulic lifting control mechanism includes connecting with elevating ram
The lifting valve connect and the pilot valve being connect with lifting valve；The oil inlet of the constant displacement pump and load-sensitive pump connects with hydraulic oil container
It connects；Characterized by further comprising prefill valve above-mentioned and LS pressure-control valves and solenoid directional control valve；The oil return of the prefill valve
Mouth is connected with hydraulic tank, and the brake pressure oil oil inlet end connection of F hydraulic fluid ports and brake fluid system, XP hydraulic fluid ports connect with accumulator
It connects, the pressure oil inlet connection of E hydraulic fluid ports and lifting valve, the oil outlet of D hydraulic fluid ports and constant displacement pump connects, C hydraulic fluid ports and load-sensitive pump
Oil outlet with the pressure oil inlet of flux amplification valve P3 mouthfuls connect；The act at the hydraulic control end, lifting valve of the LS pressure-control valves
It rises after pilot control end is connected with each other and is connected through lifting guide's output end of solenoid directional control valve and pilot valve；The LS pressure control
The pump intake pressure signaling interface X12 that a hydraulic fluid ports of valve are pumped with the X2 hydraulic fluid ports and load-sensitive of the prefill valve simultaneously is connect, the LS
The b hydraulic fluid ports of pressure-control valve and the LS2 hydraulic fluid ports of steering gear connect, c hydraulic fluid ports and the load-sensitive pump of the LS pressure-control valves
LS1 hydraulic fluid ports connect, and the d hydraulic fluid ports of the LS pressure-control valves are connected with hydraulic tank, when the hydraulic control end of the LS pressure-control valves
When with pilot pressure signal, a hydraulic fluid ports are connected with c hydraulic fluid ports, when the hydraulic control end of the LS pressure-control valves does not have pilot pressure letter
Number when, b hydraulic fluid ports are connected with c hydraulic fluid ports, a hydraulic fluid ports cut-off；When elevating ram is close to lifting stroke end position, the electromagnetic switch
Valve is in rest position；The hydraulic-controlled switch valve, which is in, when the pump intake pressure signaling interface of load-sensitive pump is with pressure output cuts
Stop bit；The flow oil outlet more than needed of the flux amplification valve is connect with the oil inlet of the lifting valve.The solenoid directional control valve tool
Have oil inlet, oil outlet, an oil return opening, lifting guide's output end of oil inlet and pilot valve connects, oil outlet simultaneously with the second liquid
Control the hydraulic control end hydraulic fluid port of switch valve, the hydraulic control end of LS pressure-control valves, lifting valve lifting pilot control end connect simultaneously, oil return
Mouth is connected with hydraulic tank, and when the solenoid directional control valve is in cut-off position, oil outlet is connected with oil return opening.Further, it also wraps
Include guide oil source valve, the oil inlet of the guide oil source valve and the XP hydraulic fluid ports of prefill valve connect, the oil outlet of guide oil source valve with
The oil inlet of pilot valve connects.
Compared with prior art, the present invention the present invention has the following advantages：
(1) prefill valve is integrated valve group, it controls steering accumulator filling liquid state, when the pressure of accumulator is less than setting
When lower limiting value, constant displacement pump gives accumulator filling liquid automatically, after energy storage pressure reaches setting upper limit value, automatically cuts off to accumulator
Filling liquid.
(2) steering is load sensitive system, and on the one hand the function of accumulator is to give braking system fuel feeding, on the other hand
It is to supply steering as urgent oil sources, if load-sensitive pumps out failure without normal direction steering fuel feeding, the fluid of accumulator
Steering will be automatically fed.Fuel feeding can remove brake accumulator, reduce cost and reduction accumulator to braking system simultaneously
System complexity.
(3) load sensitive pump be expert at turner condition when steering pump flow matched with the demand of steering；In lifting work
When condition, load sensitive pump supplies hoisting system with maximum pump discharge.
(4) impact that elevating ram stroke end is reduced by the way of combination of electric and hydraulic, when elevating ram reaches regulation
After stroke, at once then cut-out fuel feeding lifts valve rod Hui Zhongwei to load sensitive pump to the fluid of hoisting system, last lifting pump
Fluid fuel cut-off to elevating ram, elevating ram terminal there are one the time buffered, reduce impact.
Description of the drawings
Fig. 1 is the schematic diagram of quarry tipper hydraulic system of the present invention.
Fig. 2 is the schematic diagram of prefill valve.
Fig. 3 is the schematic diagram of the second hydraulic-controlled switch valve.
Parts title and serial number in figure：
Constant displacement pump 1, load-sensitive pump the 2, second hydraulic-controlled switch valve 3, LS pressure-control valves 4, prefill valve 5, hydraulic oil container 6,
Accumulator 7, flux amplification valve 9, steering cylinder 10, guide oil source valve 11, solenoid directional control valve 12, pilot valve 13, is lifted at steering gear 8
Oil-lifting jar 14, balanced valve 15, lifting valve 16, braking system 17.
Filling liquid switch valve 51, unloading valve 52, manual switch valve 53, overflow valve 54, electromagnetic switch valve 55, the first check valve
56, hydraulic-controlled switch valve 57, the second check valve 58.
Pilot operated directional control valve 31, inserting switch valve 32.
Specific implementation mode
Illustrate specific embodiment below in conjunction with the accompanying drawings.
The schematic diagram of mining self-unloading vehicle hydraulic system is as shown in Figure 1, including brake fluid system 17, hydraulic pressure in the present embodiment
Course changing control mechanism and steering cylinder connected to it 10, is born hydraulic lifting control mechanism and elevating ram connected to it 14
Lotus sensitive pump 2, constant displacement pump 1, accumulator 7, hydraulic oil container 6, prefill valve 5, LS pressure-control valves 4, the second hydraulic-controlled switch valve 3 and electricity
Magnetic reversal valve 12, guide oil source valve 11.Constant displacement pump 1 is gear pump.The oil inlet of 1 oil inlet S2 of constant displacement pump and load-sensitive pump 2
S1 is connected with hydraulic tank.
Fluid-link steering control mechanism includes the flux amplification valve 9 being connect with steering cylinder 10 and is connect with flux amplification valve 9
Steering gear 8.
Hydraulic lifting control mechanism includes the lifting valve 16 being connect with elevating ram 14 and the guide being connect with lifting valve 16
Valve 13 is provided with balanced valve 15 between lifting valve 16 and elevating ram 14.
Prefill valve 5 is a kind of pile-up valve, and its principle is as shown in Figure 2, have for external oil circuit connection XP hydraulic fluid ports,
C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports, oil return inlet T 1, X2 hydraulic fluid ports, and include the first check valve 56, the second check valve 58, fill
Liquid switch valve 51, unloading valve 52, overflow valve 54, hydraulic-controlled switch valve 57, electromagnetic switch valve 55 and manual switch valve 53.
The oil inlet end of second check valve 58 is connect with D hydraulic fluid ports, and the oil outlet end of the first check valve 56 is connect with F hydraulic fluid ports；First
The oil inlet end and XP hydraulic fluid ports of check valve 56 are connect with the oil outlet end of the second check valve 58.
Hydraulic-controlled switch valve 57 is connected between C hydraulic fluid ports and the oil outlet end of the second check valve 58, the hydraulic control of hydraulic-controlled switch valve 57
End is connect with X2 hydraulic fluid ports.When the pressure of X2 hydraulic fluid ports is more than the pressure of the spring cavity of hydraulic-controlled switch valve 57, hydraulic-controlled switch valve 57 is in
Cut-off state, when the pressure of X2 hydraulic fluid ports is less than the pressure of the spring cavity of hydraulic-controlled switch valve, hydraulic-controlled switch valve 57 is on shape
State.
The oil inlet end and control terminal of filling liquid switch valve 51 are connect with D hydraulic fluid ports, and the spring cavity of filling liquid switch valve 51 is through damping
Hole is connect with the oil inlet end of filling liquid switch valve 51, and the oil outlet end of filling liquid switch valve 51 is connect with E hydraulic fluid ports.
The oil inlet end of unloading valve 52 is connect with the spring cavity of filling liquid switch valve 51, and the control terminal of unloading valve 52 is unidirectional with second
The oil outlet end of valve 58 connects, and the oil outlet end of unloading valve 52 is connect with oil return inlet T 1.
Overflow valve 54, electromagnetic switch valve 55, manual switch valve 53 3 valve it is in parallel and be connected to XP hydraulic fluid ports and oil return inlet T 1 it
Between.The effect of electromagnetic switch valve 55 and manual switch valve 53 is to carry out pressure release of draining the oil, electromagnetic switch valve to accumulator 7 if necessary
55 and manual switch valve 53 can select one setting or both and all be arranged, corresponding realize automatically controlled drain the oil or drains the oil manually.Overflow valve
54 effect is to play safety valve, and it is more than setting value to prevent the pressure in accumulator 7.
Second hydraulic-controlled switch valve 3 is also a kind of pile-up valve, as shown in figure 3, it has for the liquid with external oil circuit connection
Control end hydraulic fluid port X5, oil inlet P 8, oil outlet P9 and oil return inlet T 5.Second hydraulic-controlled switch valve 3 includes pilot operated directional control valve 31 and inserts
Switch valve 32 is filled, the hydraulic control end of pilot operated directional control valve 31 is connect with hydraulic control end hydraulic fluid port X5, and a hydraulic fluid ports of pilot operated directional control valve and inserting switch
The oil inlet end a of valve 32 is connect with oil inlet P 8, and the b hydraulic fluid ports of pilot operated directional control valve are connect with oil return inlet T 5, the c oil of pilot operated directional control valve
Mouth is connect with the hydraulic control end c of inserting switch valve 32, and the oil outlet end b of inserting switch valve 32 is connect with oil outlet P9；When hydraulic control end oil
When mouth X5 has pilot pressure signal, pilot operated directional control valve is in left position, and b hydraulic fluid ports are connected with the c hydraulic fluid ports of pilot operated directional control valve, hydraulic control
The a hydraulic fluid ports of reversal valve end, and the oil inlet end a of inserting switch valve 32 is connected with oil outlet end b, the second hydraulic-controlled switch valve 3 of realization into
It is connected between hydraulic fluid port P8 and oil outlet P9.When hydraulic control end, hydraulic fluid port X5 does not have pilot pressure signal, pilot operated directional control valve is in right position,
Its a hydraulic fluid port is connected with c hydraulic fluid ports, insert switch valve 32 oil inlet end a and oil outlet end b cut-off namely the second hydraulic-controlled switch valve 3 into
End between hydraulic fluid port P8 and oil outlet P9.
As shown in Figure 1, solenoid directional control valve 12 has oil inlet P 14, oil outlet P15, oil return inlet T 11, oil inlet P 15 and elder generation
Lifting guide's output end X6 connections of pilot valve 13, oil outlet P14 while hydraulic control end hydraulic fluid port X5, LS with the second hydraulic-controlled switch valve 3
The hydraulic control end X3 of pressure-control valve 4, the lifting pilot control end Xa1 of lifting valve 16 are connected simultaneously, oil return inlet T 11 and hydraulic oil container
6 connections, when solenoid directional control valve 12 is in cut-off position, oil outlet P14 is connected with oil return inlet T 11.The conducting of solenoid directional control valve 12 with
Cut-off is associated with the stroke of elevating ram 14, when elevating ram 14 extend out to the final position of lifting stroke, mining self-unloading
The control system of vehicle makes solenoid directional control valve 12 be in cut-off position after detecting the signal, is otherwise on position.
LS pressure-control valves 4 are two position four-way valves, and four hydraulic fluid ports are a hydraulic fluid ports, b hydraulic fluid ports, c hydraulic fluid ports and d hydraulic fluid ports respectively.Its
The a hydraulic fluid ports of middle LS pressure-control valves 4 pump 2 pump intake pressure signaling interface X12 with the X2 hydraulic fluid ports and load-sensitive of prefill valve 5 simultaneously
Connection, the b hydraulic fluid ports of LS pressure-control valves 4 are connect with the LS2 hydraulic fluid ports of steering gear 8, and the c hydraulic fluid ports and load of LS pressure-control valves 4 are quick
The LS1 hydraulic fluid ports connection of sense pump 2, the d hydraulic fluid ports of LS pressure-control valves 4 are connect with hydraulic oil container 6, when the hydraulic control of LS pressure-control valves 4
When X3 being held to have pilot pressure signal, a hydraulic fluid ports of LS pressure-control valves 4 are connected with c hydraulic fluid ports, and b hydraulic fluid ports are connected with d hydraulic fluid ports, load
The pump intake pressure signal of load-sensitive pump 2 is transferred to the LS1 of load-sensitive pump 2 by the pump intake pressure signaling interface X12 of sensitive pump 2
Hydraulic fluid port makes load-sensitive pump become a constant displacement pump, with the outside fuel feeding of maximum pump discharge (to hydraulic lifting system fuel feeding).Work as LS
When the hydraulic control end X3 of pressure-control valve 4 does not have pilot pressure signal, b hydraulic fluid ports are connected with c hydraulic fluid ports, the cut-off of a hydraulic fluid ports, steering gear 8
LS2 hydraulic fluid ports load pressure signal by LS pressure-control valves 4 be transferred to load-sensitive pump 2 LS1 hydraulic fluid ports, load-sensitive pump
2 export corresponding flow to hydraulic steering system fuel feeding according to the size of load pressure.
As shown in Figure 1, the oil return inlet T 1 of prefill valve 5 is connect with hydraulic oil container 6, the system of F hydraulic fluid ports and brake fluid system 17
Dynamic pressure oil oil inlet end connect, to 17 fuel feeding of braking system, E hydraulic fluid ports are connect with the pressure oil inlet P 4 of lifting valve 16, D hydraulic fluid ports and
The oil outlet P2 connections of constant displacement pump 1, C hydraulic fluid ports and load-sensitive pump 2 oil outlet P1 with the pressure oil inlet of flux amplification valve 9
P3 connections.XP hydraulic fluid ports draw five stub interfaces such as XP1 hydraulic fluid ports, XP2 hydraulic fluid ports, XP3 hydraulic fluid ports, XP4 hydraulic fluid ports and X1 hydraulic fluid ports, wherein
XP1 hydraulic fluid ports and XP2 hydraulic fluid ports are correspondingly connected with two accumulators 7, and XP3 hydraulic fluid ports connect pressure switch, and XP4 hydraulic fluid ports connect pressure gauge.
The flow oil outlet P13 more than needed of flux amplification valve 9 is connect with the oil inlet P 4 of lifting valve 16.Guide oil source valve 11
Oil inlet P 5 is connect with the stub interface X1 hydraulic fluid ports of the XP hydraulic fluid ports of prefill valve 5, the oil outlet P6 and pilot valve of guide oil source valve 11
13 connection of oil inlet P 7 namely pilot valve 13 provide pressure oil-source by accumulator 7 and constant displacement pump.
The oil inlet P 8 of second hydraulic-controlled switch valve 3 is connect with the oil outlet P1 of load-sensitive pump 2, the second hydraulic-controlled switch valve 3
Oil outlet P9 connect with the pressure oil inlet P 4 of lifting valve 16, the hydraulic control end hydraulic fluid port X5 of the second hydraulic-controlled switch valve 3 is changed with electromagnetism
To 12 oil outlet P14 connections of valve, oil return inlet T 5 is connect with hydraulic oil container 6.
In this embodiment, when each component works normally, the oil outlet P2 of constant displacement pump is born to the D hydraulic fluid port fuel feeding of oil charge valve 5
The pressure signal of the pump intake pressure signaling interface X12 outputs of lotus sensitive pump 2 makes hydraulic-controlled switch valve 57 be in cut-off position.If accumulation of energy
When pressure in device 7 is less than predetermined value (Opening pressure for being less than unloading valve 52), the spring cavity and control terminal of filling liquid switch valve 51
Pressure it is equal, filling liquid switch valve 51 is closed, constant displacement pump 1 export high pressure oil pass through the second check valve 58 and XP1
Hydraulic fluid port and XP2 hydraulic fluid ports are to 7 filling liquid of accumulator, so as to storage energy, realize to braking system and pilot valve fuel feeding and emergent steering
When to hydraulic steering system fuel feeding.When the pressure of accumulator 7 is higher than predetermined value (Opening pressure for being higher than unloading valve 52), unloading valve
52 open, and the hydraulic oil in the spring cavity of filling liquid switch valve 51 flows to hydraulic oil container 6 through unloading valve 52 so that filling liquid switch valve 51
Spring cavity pressure be less than control end pressure, filling liquid switch valve 51 open, constant displacement pump 1 export D of the hydraulic oil through prefill valve 5
Hydraulic fluid port, filling liquid switch valve 51, E hydraulic fluid ports flow to lifting valve 16, by the middle position off-load of lifting valve 16 or for elevating ram 14
Lifting acts.
When quarry tipper carries out go to action, hydraulic lifting system does not work at this time, the lifting guide of pilot valve 13
Output end X6 does not have pilot pressure output, LS pressure-control valves 4 to be in left position, and b hydraulic fluid ports are connected with c hydraulic fluid ports, steering gear 8
The load pressure signal of LS2 hydraulic fluid ports is transferred to the LS1 hydraulic fluid ports of load-sensitive pump 2 through LS pressure-control valves 4, and load-sensitive pump 2 is then
Load pressure signal according to steering gear 8 exports corresponding flow from the pressure oil inlet P 3 of flux amplification valve 9 to fluid-link steering
System fuel feeding turns to flow more than needed and then flows to lifting valve 16 from the flow oil outlet P13 more than needed of flux amplification valve 9, from lifting
The middle bit stream of valve 16 is to hydraulic oil container 6.
When quarry tipper carries out lifting action, at this time without go to action, lifting guide's output end of pilot valve 13
X6 exports pilot pressure.The pilot pressure of lifting guide's output end X6 outputs of pilot valve acts on the second hydraulic-controlled switch valve 3
Make oil inlet P 8 and the oil outlet P9 conductings of the second hydraulic-controlled switch valve 3 on the hydraulic fluid port X5 of hydraulic control end；The lifting guide of pilot valve 13 is defeated
The pilot pressure of outlet X6 outputs acts on the control terminal of LS pressure-control valves 4, and LS pressure-control valves 4 is made to be in right position, a oil
Mouth is connected with c hydraulic fluid ports, and the pressure of the pump intake pressure signaling interface X12 outputs of load-sensitive pump 2 passes through LS pressure-control valves 4 and transmits
To the LS1 hydraulic fluid ports of load-sensitive pump 2 so that load-sensitive pump 2 works in constant displacement pump and according to its discharge capacity maximum value output hydraulic pressure
Oil；The pilot pressure of lifting guide's output end X6 outputs of pilot valve 13 acts on the lifting pilot control end Xa1 of lifting valve 16
Elevating ram 14 is set to carry out lifting action.Load-sensitive pump 2 is most of through the second hydraulic control with the hydraulic oil of maximum discharge capacity output
Switch valve 3, small part through in flux amplification valve 9 pressure-gradient control valve and flow oil outlet P13 more than needed, two-way oil circuit interflow after flow to lift
Lift valve 16, D hydraulic fluid port, E hydraulic fluid port and the hydraulic oil of load-sensitive pump 2 output of the hydraulic oil that constant displacement pump 1 exports through prefill valve 5 collaborate
Afterwards also to 16 fuel feeding of lifting valve so that elevating ram 14 quickly lifts.The terminal of stroke is lifted when elevating ram 14 extend out to it
When position, the displacement signal that the electromagnet of solenoid directional control valve 12 receives the setting of elevating ram 14 obtains electric, and solenoid directional control valve 12 changes
It is connected to and is connect with hydraulic oil container 6 to right position, oil outlet P14 and oil return inlet T 11, the second hydraulic-controlled switch valve 3 blocks load
Sensitive pump 2 supplies the fluid of lifting valve 16, then the valve rod Hui Zhongwei of lifting valve 16, the fluid fuel cut-off of last constant displacement pump 1
To elevating ram 14, elevating ram 14 terminal there are one the time buffered, reduce impact.
When power failure occurs in quarry tipper, such as engine failure is shut down, at this time constant displacement pump 1 and load-sensitive pump
2 are all unable to output hydraulic pressure oil, and the pressure of the pump intake pressure signaling interface X12 of load-sensitive pump 2 is zero, and hydraulic-controlled switch valve 57 is in
Left position, the hydraulic oil in accumulator 7, to hydraulic steering system fuel feeding, pass through the first check valve by hydraulic-controlled switch valve 57, C hydraulic fluid ports
56, F hydraulic fluid ports are to 17 fuel feeding of braking system, to realize fluid-link steering and braking system fuel feeding in emergency circumstances.
In the above-described embodiment, when carrying out lifting operation, the hydraulic oil of 2 output of load-sensitive pump passes through the second hydraulic control
The flow oil outlet P13 two-way oil circuit more than needed of switch valve 3 and flux amplification valve 9 is to 16 fuel feeding of lifting valve.In the specific implementation, may be used
According to design requirement in quarry tipper hydraulic system, can only design oil circuit all the way, that is, cast out the second hydraulic-controlled switch valve 3,
More than needed flow oil outlet P13 of the hydraulic oil through flux amplification valve 9 of 2 output of load-sensitive pump flows to lifting valve when lifting.Also may be used
It is designed with the oil circuit for casting out the flow oil outlet P13 more than needed of flux amplification valve to lifting valve 16,2 output of load-sensitive pump when lifting
Hydraulic oil only through the second hydraulic-controlled switch valve 3 flow to lifting valve 16.
Claims (10)
1. a kind of prefill valve, it is characterised in that have for XP hydraulic fluid ports, C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, the F with external oil circuit connection
Hydraulic fluid port, oil return opening (T1), X2 hydraulic fluid ports, and include that the first check valve, the second check valve, filling liquid switch valve, unloading valve, hydraulic control are opened
Close valve；
The oil inlet end of second check valve is connect with D hydraulic fluid ports, and the oil outlet end of the first check valve is connect with F hydraulic fluid ports；Described first is unidirectional
The oil inlet end and XP hydraulic fluid ports of valve are connect with the oil outlet end of the second check valve；
The hydraulic-controlled switch valve is connected between C hydraulic fluid ports and the oil outlet end of the second check valve, the hydraulic control end of hydraulic-controlled switch valve and X2
Hydraulic fluid port connects；
The oil inlet end and control terminal of the filling liquid switch valve are connect with D hydraulic fluid ports, the spring cavity of filling liquid switch valve through damping hole with
The oil inlet end of filling liquid switch valve connects, and the oil outlet end of filling liquid switch valve is connect with E hydraulic fluid ports；
The oil inlet end of unloading valve is connect with the spring cavity of filling liquid switch valve, the oil outlet end of the control terminal of unloading valve and the second check valve
Connection, the oil outlet end of unloading valve are connect with oil return opening (T1).
2. prefill valve according to claim 1, it is characterised in that be additionally provided with and put between XP hydraulic fluid ports and oil return opening (T1)
Fuel tap and or overflow valve.
3. prefill valve according to claim 2, it is characterised in that the fuel outlet valve includes being connected to XP hydraulic fluid ports and oil return opening
(T1) between electromagnetic switch valve and or manual switch valve.
4. a kind of quarry tipper hydraulic system, including brake fluid system, fluid-link steering control mechanism and connected to it turn
To oil cylinder, hydraulic lifting control mechanism and elevating ram connected to it, load-sensitive pump, constant displacement pump, accumulator, hydraulic oil
Case；The fluid-link steering control mechanism includes the flux amplification valve being connect with steering cylinder and the steering that is connect with flux amplification valve
Device；The hydraulic lifting control mechanism includes the lifting valve being connect with elevating ram and the pilot valve that is connect with lifting valve；It is described
The oil inlet of constant displacement pump and load-sensitive pump is connected with hydraulic tank；Characterized by further comprising any in claims 1 to 3
Prefill valve and LS pressure-control valves (4), the second hydraulic-controlled switch valve (3) and solenoid directional control valve (12) described in；
The oil return opening (T1) of the prefill valve is connected with hydraulic tank, the brake pressure oil oil inlet of F hydraulic fluid ports and brake fluid system
End connection, XP hydraulic fluid ports connect with accumulator, and the pressure oil inlet (P4) of E hydraulic fluid ports and lifting valve connects, and D hydraulic fluid ports and constant displacement pump go out
Hydraulic fluid port connects, and the oil outlet of C hydraulic fluid ports and load-sensitive pump is connect with the pressure oil inlet of flux amplification valve (P3)；
The oil inlet (P8) of second hydraulic-controlled switch valve (3) is connect with the oil outlet (P1) that load-sensitive pumps, and the second hydraulic control is opened
The oil outlet (P9) for closing valve (3) is connect with the pressure oil inlet (P4) of lifting valve, the hydraulic control end hydraulic fluid port of the second hydraulic-controlled switch valve (3)
(X5) and the hydraulic control end of LS pressure-control valves (X3), lifting valve lifting pilot control end (Xa1) be connected with each other after changed through electromagnetism
It is connect to valve (12) with the lifting guide output end (X6) of pilot valve, when the hydraulic control end hydraulic fluid port (X5) of the second hydraulic-controlled switch valve (3)
The oil inlet (P8) of second hydraulic-controlled switch valve (3) described in when with pilot pressure signal is connected with oil outlet (P89)；
The pump intake pressure signal that a hydraulic fluid ports of the LS pressure-control valves are pumped with the X2 hydraulic fluid ports and load-sensitive of the prefill valve simultaneously
Interface (X12) connects, and the b hydraulic fluid ports of the LS pressure-control valves and the LS2 hydraulic fluid ports of steering gear connect, the LS pressure-control valves
C hydraulic fluid ports are connect with the LS1 hydraulic fluid ports that load-sensitive pumps, and the d hydraulic fluid ports of the LS pressure-control valves are connected with hydraulic tank, as the LS
When the hydraulic control end (X3) of pressure-control valve has pilot pressure signal, a hydraulic fluid ports are connected with c hydraulic fluid ports, when the LS pressure-control valves
Hydraulic control end when not having pilot pressure signal, b hydraulic fluid ports are connected with c hydraulic fluid ports, the cut-off of a hydraulic fluid ports；
When elevating ram is close to lifting stroke end position, the solenoid directional control valve (12) is in rest position；Load-sensitive
There is the pump intake pressure signaling interface (X12) of pump the hydraulic-controlled switch valve (57) when pressure output to be in cut-off position.
5. quarry tipper hydraulic system according to claim 4, it is characterised in that the second hydraulic-controlled switch valve (3) packet
Pilot operated directional control valve (31) and inserting switch valve (32) are included, hydraulic control end and the hydraulic control end hydraulic fluid port (X5) of the pilot operated directional control valve (31) connect
It connects, the oil inlet end of a hydraulic fluid ports of pilot operated directional control valve and the inserting switch valve (32) is connect with oil inlet (P8), pilot operated directional control valve
B hydraulic fluid ports and the oil return opening (T5) of the hydraulic-controlled switch valve that connect hydraulic oil container connect, c hydraulic fluid ports and the inserting of pilot operated directional control valve switch
The hydraulic control end of valve connects, and the oil outlet end for inserting switch valve is connect with oil outlet (P9)；When hydraulic control end hydraulic fluid port (X5) has first pilot
When force signal, the b hydraulic fluid ports of pilot operated directional control valve are connected with c hydraulic fluid ports, and a hydraulic fluid ports cut-off, the oil inlet end and oil outlet end for inserting switch valve is led
Logical, when hydraulic control end hydraulic fluid port (X5) does not have pilot pressure signal, a hydraulic fluid ports of pilot operated directional control valve are connected with c hydraulic fluid ports, insert switch valve
Oil inlet end and oil outlet end end.
6. quarry tipper hydraulic system according to claim 4 or 5, it is characterised in that solenoid directional control valve (12) tool
There are oil inlet (P14), oil outlet (P15), oil return opening (T11), the lifting guide output end (X6) of oil inlet (P15) and pilot valve
Connection, oil outlet (P14) and meanwhile with the hydraulic control end of the hydraulic control end hydraulic fluid port (X5) of the second hydraulic-controlled switch valve (3), LS pressure-control valves
(X3), the lifting pilot control end (Xa1) of lifting valve connects simultaneously, and oil return opening (T11) is connected with hydraulic tank, and the electromagnetism changes
When being in cut-off position to valve (12), oil outlet (P14) is connected with oil return opening (T11).
7. quarry tipper hydraulic system according to claim 6, it is characterised in that further include guide oil source valve, the elder generation
The oil inlet (P5) of Oil Guide source valve is connect with the XP hydraulic fluid ports of prefill valve, the oil inlet of oil outlet (P6) and pilot valve of guide oil source valve
Mouth (P7) connection.
8. quarry tipper hydraulic system according to claim 4 or 5, it is characterised in that the flux amplification valve is had more than needed
Flow oil outlet (P13) is connect with the oil inlet (P4) of the lifting valve.
9. a kind of quarry tipper hydraulic system, including brake fluid system, fluid-link steering control mechanism and connected to it turn
To oil cylinder, hydraulic lifting control mechanism and elevating ram connected to it, load-sensitive pump, constant displacement pump, accumulator, hydraulic oil
Case；The fluid-link steering control mechanism includes the flux amplification valve being connect with steering cylinder and the steering that is connect with flux amplification valve
Device；The hydraulic lifting control mechanism includes the lifting valve being connect with elevating ram and the pilot valve that is connect with lifting valve；It is described
The oil inlet of constant displacement pump and load-sensitive pump is connected with hydraulic tank；Characterized by further comprising any in claims 1 to 3
Prefill valve and LS pressure-control valves (4) described in and solenoid directional control valve (12)；
The oil return opening (T1) of the prefill valve is connected with hydraulic tank, the brake pressure oil oil inlet of F hydraulic fluid ports and brake fluid system
End connection, XP hydraulic fluid ports connect with accumulator, and the pressure oil inlet (P4) of E hydraulic fluid ports and lifting valve connects, and D hydraulic fluid ports and constant displacement pump go out
Hydraulic fluid port connect, C hydraulic fluid ports and load-sensitive pump oil outlet with the pressure oil inlet of flux amplification valve P3 mouthfuls connect；
Through electromagnetism after the hydraulic control end (X3) of the LS pressure-control valves, lifting pilot control end (Xa1) interconnection of lifting valve
Reversal valve (12) is connect with the lifting guide output end (X6) of pilot valve；
The pump intake pressure signal that a hydraulic fluid ports of the LS pressure-control valves are pumped with the X2 hydraulic fluid ports and load-sensitive of the prefill valve simultaneously
Interface (X12) connects, and the b hydraulic fluid ports of the LS pressure-control valves and the LS2 hydraulic fluid ports of steering gear connect, the LS pressure-control valves
C hydraulic fluid ports are connect with the LS1 hydraulic fluid ports that load-sensitive pumps, and the d hydraulic fluid ports of the LS pressure-control valves are connected with hydraulic tank, as the LS
When the hydraulic control end (X3) of pressure-control valve has pilot pressure signal, a hydraulic fluid ports are connected with c hydraulic fluid ports, when the LS pressure-control valves
Hydraulic control end when not having pilot pressure signal, b hydraulic fluid ports are connected with c hydraulic fluid ports, the cut-off of a hydraulic fluid ports；
When elevating ram is close to lifting stroke end position, the solenoid directional control valve (12) is in rest position；Load-sensitive
There is the pump intake pressure signaling interface (X12) of pump the hydraulic-controlled switch valve (57) when pressure output to be in cut-off position；The flow
The flow oil outlet (P13) more than needed of amplifying valve connect with the oil inlet (P4) of the lifting valve.
10. quarry tipper hydraulic system according to claim 9, it is characterised in that the solenoid directional control valve has oil inlet
Lifting guide's output end of mouth, oil outlet, oil return opening, oil inlet and pilot valve connects, oil outlet simultaneously with the second pilot-controlled switch
The hydraulic control end hydraulic fluid port of valve, the hydraulic control end of LS pressure-control valves, lifting valve lifting pilot control end connect simultaneously, oil return opening and liquid
Pressure oil case connects, and when the solenoid directional control valve is in cut-off position, oil outlet is connected with oil return opening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810311113.1A CN108561352B (en) | 2018-04-09 | 2018-04-09 | Prefill valve and mining dump truck hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810311113.1A CN108561352B (en) | 2018-04-09 | 2018-04-09 | Prefill valve and mining dump truck hydraulic system |
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| CN108561352B CN108561352B (en) | 2020-02-25 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109466527A (en) * | 2018-09-28 | 2019-03-15 | 中国铁建重工集团有限公司 | A kind of intelligence control system based on electrichydraulic control |
| CN109572811A (en) * | 2019-01-23 | 2019-04-05 | 徐州徐工矿业机械有限公司 | The preferential steering system of articulated truck and forward method based on insert type change-over valve |
| CN111765135A (en) * | 2020-07-10 | 2020-10-13 | 中国铁建重工集团股份有限公司 | Hydraulic control system for arch frame operation trolley |
| CN112343872A (en) * | 2020-11-16 | 2021-02-09 | 广西柳工机械股份有限公司 | Auxiliary lifting hydraulic system and engineering machinery |
| CN112943732A (en) * | 2021-03-24 | 2021-06-11 | 北京航空航天大学 | Overflow valve with different opening and closing pressures |
| CN114033767A (en) * | 2021-09-13 | 2022-02-11 | 中国北方车辆研究所 | Control method of brake unloading liquid-filling valve bank |
| CN114215796A (en) * | 2021-09-26 | 2022-03-22 | 徐州徐工矿业机械有限公司 | Electro-hydraulic proportional pilot control lifting system of mining dump truck |
| CN114312718A (en) * | 2022-01-29 | 2022-04-12 | 浙江海宏液压科技股份有限公司 | Integrated braking oil tank assembly |
| CN115899004A (en) * | 2023-01-09 | 2023-04-04 | 临工重机股份有限公司 | Hydraulic dumping control system of dump truck and control method thereof |
| CN117642309A (en) * | 2021-07-19 | 2024-03-01 | 卡特彼勒公司 | Lift system balance valve signal cutoff |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109466527A (en) * | 2018-09-28 | 2019-03-15 | 中国铁建重工集团有限公司 | A kind of intelligence control system based on electrichydraulic control |
| CN109466527B (en) * | 2018-09-28 | 2020-12-29 | 中国铁建重工集团股份有限公司 | Intelligent control system based on electro-hydraulic control |
| CN109572811A (en) * | 2019-01-23 | 2019-04-05 | 徐州徐工矿业机械有限公司 | The preferential steering system of articulated truck and forward method based on insert type change-over valve |
| CN109572811B (en) * | 2019-01-23 | 2023-07-18 | 徐州徐工矿业机械有限公司 | Articulated dumper priority steering system and steering method based on plug-in reversing valve |
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| CN111765135A (en) * | 2020-07-10 | 2020-10-13 | 中国铁建重工集团股份有限公司 | Hydraulic control system for arch frame operation trolley |
| CN112343872A (en) * | 2020-11-16 | 2021-02-09 | 广西柳工机械股份有限公司 | Auxiliary lifting hydraulic system and engineering machinery |
| CN112943732A (en) * | 2021-03-24 | 2021-06-11 | 北京航空航天大学 | Overflow valve with different opening and closing pressures |
| CN112943732B (en) * | 2021-03-24 | 2022-05-17 | 北京航空航天大学 | Overflow valve with different opening and closing pressures |
| CN117642309A (en) * | 2021-07-19 | 2024-03-01 | 卡特彼勒公司 | Lift system balance valve signal cutoff |
| CN114033767A (en) * | 2021-09-13 | 2022-02-11 | 中国北方车辆研究所 | Control method of brake unloading liquid-filling valve bank |
| CN114033767B (en) * | 2021-09-13 | 2023-12-12 | 中国北方车辆研究所 | Control method of brake unloading liquid filling valve group |
| CN114215796A (en) * | 2021-09-26 | 2022-03-22 | 徐州徐工矿业机械有限公司 | Electro-hydraulic proportional pilot control lifting system of mining dump truck |
| CN114215796B (en) * | 2021-09-26 | 2024-08-06 | 徐州徐工矿业机械有限公司 | Electro-hydraulic proportional pilot control lifting system of mining dump truck |
| CN114312718A (en) * | 2022-01-29 | 2022-04-12 | 浙江海宏液压科技股份有限公司 | Integrated braking oil tank assembly |
| CN114312718B (en) * | 2022-01-29 | 2022-12-27 | 浙江海宏液压科技股份有限公司 | Integrated braking oil tank assembly |
| CN115899004A (en) * | 2023-01-09 | 2023-04-04 | 临工重机股份有限公司 | Hydraulic dumping control system of dump truck and control method thereof |
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