CN105822618A - Lifting valve plate of electric-hydraulic proportional multi-way valve of forklift - Google Patents
Lifting valve plate of electric-hydraulic proportional multi-way valve of forklift Download PDFInfo
- Publication number
- CN105822618A CN105822618A CN201610339749.8A CN201610339749A CN105822618A CN 105822618 A CN105822618 A CN 105822618A CN 201610339749 A CN201610339749 A CN 201610339749A CN 105822618 A CN105822618 A CN 105822618A
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- Prior art keywords
- valve
- oil
- cavity
- end cap
- valve body
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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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
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
-
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to the technical field of engineering machine hydraulic elements, in particular to a lifting valve plate of an electric-hydraulic proportional multi-way valve of a forklift. The lifting valve plate can achieve full-speed descending of a single-acting cylinder and secondary pressure of the multi-way valve. The lifting valve plate comprises a valve body, an overflow valve, a backpressure valve, proportional electromagnetic valves, a compensation valve, a reversing valve rod and end covers. A pressure difference formed between a pilot oil inlet and a pilot oil return opening in a valve element of each proportional electromagnetic valve is introduced into cover cavities to push the reversing valve rod to move left and right. A first oil way, a work oil opening and an oil inlet trough are arranged in the valve body, and one end of the oil inlet trough communicates with the first oil way. A valve element of the compensation valve is located in the oil inlet trough. The first oil way is provided with a main oil return opening, and the backpressure valve is arranged on the valve body. A second oil way is arranged on the valve body and connected with the overflow valve and the backpressure valve. A first cavity and a second cavity are formed in the reversing valve rod, and a first small throttle hole and a third small throttle hole are formed in the peripheral wall of the reversing valve rod.
Description
Technical field
Patent of the present invention relates to hydraulic components of construction machinery technical field, is specifically related to the descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve.
Background technology
Along with developing rapidly of modern science and technology, constantly popularizing of fork truck, fork truck is the most not only satisfied with by people can realize its function, the comfortableness of work efficiency, work accuracy and operator is all proposed the highest requirement, therefore the hydraulic multichannel valve performance of fork truck kernel component is also required that more and more higher, electro-hydraulic proportional multi-way valve because its control accuracy is high, install and use flexibly and the trend of many-sided advantage the becomes future development such as contamination resistance is strong.Domestic application is external import in the electro-hydraulic proportional multi-way valve overwhelming majority of fork truck at present, problem of both in use existing, electro-hydraulic proportional multi-way valve is because of its integrated load sensitive system, all use in two-way cylinder hydraulic system, and Domestic Forklift jacking system the most all uses one-way cylinder, the decline of door frame is by load deadweight, use and must revise hydraulic system, using in one-way cylinder oil piping system of electro-hydraulic proportional multi-way valve, specially by deadweight decline, the pressure of load sensitive system is always load pressure to the forklift door frame of one-way cylinder, pump output pressure is only capable of promoting commutation valve rod segment stroke, can not realize declining at full speed；Additionally fork truck only needs high pressure during hoisting, and all take less than high pressure in anteversion and retroversion and accessory, existing banked direction control valves all uses and joins plug-in mounting overflow valve to realize secondary pressure in the work having demand, in this case the too much overflow valve of plug-in mounting can cause cost and fault rate to uprise, and plug-in mounting overload valve does not causes again energy dissipation heating serious.
Summary of the invention
In order to overcome defect of the prior art, the present invention can realize the full speed of single-acting cylinder and decline, and can realize the descending valve plate of the fork truck electro-hydraulic proportional multi-way valve of the secondary pressure of banked direction control valves.
The descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve, including valve body, overflow valve, counterbalance valve, proportional solenoid, recuperation valve and the commutation valve rod being arranged in valve body, described valve body both sides are provided with end cap, and the two ends of commutation valve rod extend to the lid intracavity of end cap；The pressure reduction that guide oil oil-in on the spool of proportional solenoid and guide oil oil return opening are formed is guided to lid intracavity and is promoted commutation valve rod to realize moving left and right；Being provided with oil duct one and actuator port in described valve body, be provided with oil-feed tank in described valve body, one end of described oil-feed tank connects with oil duct one；The spool of described recuperation valve is positioned at oil-feed tank；Described oil duct one is provided with main oil return opening, and described valve body is provided with the described counterbalance valve connected with main oil return opening；Being provided with the oil duct two connected with oil duct one on described valve body, described oil duct two is all connected with overflow valve and counterbalance valve；Cavity one and cavity two it is provided with in described commutation valve rod, it is provided with throttling pore one and throttling pore three on described commutation valve rod perisporium, when the valve rod that commutates moves right, described throttling pore one connects with actuator port, throttling pore three connects with main oil return opening, when the valve rod that commutates is moved to the left, described throttling pore one connects with main oil return opening, and throttling pore three connects with oil duct one.
The present invention is further arranged to: be provided with shuttle valve on described valve body.
The present invention is further arranged to: described cavity one and cavity two are coaxially disposed, and described cavity one and cavity two extend to the middle part of commutation valve rod.
The present invention is further arranged to: described cavity one is symmetrical arranged with cavity two；Described oil duct one is arranged relative to the axisymmetrical of recuperation valve spool.
The present invention is further arranged to: described end cap includes end cap one and end cap two, described proportional solenoid includes controlling proportional solenoid one and the proportional solenoid two that reversing valve core moves, described proportional solenoid one is connected with end cap one by passage one, and described proportional solenoid two is connected with end cap two by passage two.
The present invention is further arranged to: the spool of described recuperation valve extends in oil-feed tank in the lump through oil duct, and the spool lower end of described recuperation valve is provided with spring one.
The present invention is prominent and useful compared to existing technology to be had the technical effect that the present invention uses and sets throttling pore one on commutation valve rod, two, three, four, the stroke promoted by pressure unloading opens throttling pore three, set up Pressure difference feedback to off-load spool spring cavity, the output pressure making pump improves, thus the full speed promoting commutation valve rod to realize single-acting cylinder declines: be provided with overflow valve on valve body, control the feedback oil circuit pressure of shuttle valve rear end, make and accessory pressure is always overflow valve pressure, when lifting work, rear end feedback oil circuit shut by shuttle valve, only feed back lifting pressure, achieve the secondary pressure of banked direction control valves.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the C portion enlarged drawing in Fig. 1；
Fig. 3 is the D portion enlarged drawing in Fig. 1；
Fig. 4 is the sectional view of the E-E in Fig. 1；
Fig. 5 is the schematic diagram of the present invention.
Label implication in figure:
1-valve body；11-oil duct one；A-actuator port；P-oil-feed tank；The main oil return opening of T-；13-oil duct two；
2-overflow valve；3-counterbalance valve；41-proportional solenoid one；42-proportional solenoid two；5-recuperation valve；
51-spring one；6-end cap one；7-end cap two；8-commutates valve rod；81-cavity one；82-cavity two；83-throttling pore one；84-throttling pore three；9-shuttle valve.
Detailed description of the invention
With specific embodiment, the invention will be further described below in conjunction with the accompanying drawings:
See shown in Fig. 1 to Fig. 5, a kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve, including valve body 1, overflow valve 2, counterbalance valve 3, proportional solenoid, recuperation valve 5 and the commutation valve rod 8 being arranged in valve body 1, described valve body 1 both sides are provided with end cap, and the two ends of commutation valve rod 8 extend to the lid intracavity of end cap；The pressure reduction that guide oil oil-in on the spool of proportional solenoid and guide oil oil return opening are formed is guided to lid intracavity and is promoted commutation valve rod 8 to realize moving left and right；Being provided with oil duct 1 and actuator port A in described valve body 1, be provided with oil-feed tank P in described valve body 1, one end of described oil-feed tank P connects with oil duct 1；The spool of described recuperation valve 5 is positioned at oil-feed tank P；Described oil duct 1 is provided with main oil return inlet T, and described valve body 1 is provided with the described counterbalance valve 3 connected with main oil return inlet T；Being provided with the oil duct 2 13 connected with oil duct 1 on described valve body 1, described oil duct 2 13 is all connected with overflow valve 2 and counterbalance valve 3；Cavity 1 and cavity 2 82 it is provided with in described commutation valve rod 8, it is provided with throttling pore 1 and throttling pore 3 84 on described commutation valve rod 8 perisporium, when the valve rod 8 that commutates moves right, described throttling pore 1 connects with actuator port A, throttling pore 3 84 connects with main oil return inlet T, when the valve rod 8 that commutates is moved to the left, described throttling pore 1 connects with main oil return inlet T, and throttling pore 3 84 connects with oil duct 1.
It is further arranged to: on described valve body 1, be provided with shuttle valve 9.
Being further arranged to: described cavity 1 and cavity 2 82 are coaxially disposed, described cavity 1 and cavity 2 82 extend to the middle part of commutation valve rod 8.
It is further arranged to: described cavity 1 is symmetrical arranged with cavity 2 82；Described oil duct 1 is arranged relative to the axisymmetrical of recuperation valve 5 spool.
It is further arranged to: described end cap includes end cap 1 and end cap 27, described proportional solenoid includes controlling proportional solenoid 1 and the proportional solenoid 2 42 that reversing valve core moves, described proportional solenoid 1 is connected with end cap 1 by passage one, and described proportional solenoid 2 42 is connected with end cap 27 by passage two.
It is further arranged to: the spool of described recuperation valve 5 is through oil duct 1 and extends in oil-feed tank P, and the spool lower end of described recuperation valve 5 is provided with spring 1.
When proportional solenoid receives the signal of telecommunication, the spool in proportional solenoid produces scaling-based shift, and guide oil oil-in and guide oil oil return opening have certain opening and produce pressure reduction, and pressure is guided to lid chamber and promotes commutation valve rod 8 to realize commutation function.When the valve rod 8 that commutates is in commutation position, fluid enters working hole from oil-feed tank PP via oil duct 1, and working hole pressure is fed back to feedback port by commutation valve rod 8 internal oil channel and communicated with system feedback oil circuit；Action of hydraulic force is in the lower end of recuperation valve 5 spool simultaneously, overcoming the precompression of spring 1, make recuperation valve 5 spool move up, oil-feed tank PP forms certain opening with oil duct 1, the pressure reduction at two ends is a definite value, and this allows for the flow relation proportional to flow area passed through.So, the flow passed through is the most relevant to aperture area, unrelated with load pressure so that the speed of actuator and stroke obtain relation one to one, reach good fretting performance.
This descending valve plate hoist action time, proportional solenoid 1 receives the signal of telecommunication, ratio is unfolded into pressure reduction, pressure conduction promotes commutation valve rod 8 to end cap 1, main oil-in fluid in oil-feed tank P enters actuator port A through the opening of recuperation valve 5 spool and then promotes cylinder movement, meanwhile, the pressure of work oil-in A feeds back to off-load spool spring cavity by internal feedback, and door frame hoisting system pressure changes with load change；During this descending valve plate down maneuver, proportional solenoid 1 promotes commutation valve rod 8, now system pressure is only off-load spool pressure (this valve is set as 1.2MPa), after promoting valve rod segment stroke, throttling pore 3 85 is connected with oil duct 1, oil duct 1 fluid sets up Pressure difference feedback to off-load spool spring cavity by throttling pore 3 85, system pressure is raised, the set pressure of counterbalance valve 3 is higher than the pressure (counterbalance valve 3 pressure is set to 3MPa) promoted required for commutation valve rod 8, system pressure continues to press on commutation valve rod 8 after being increased to the 3MPa set, complete door frame down maneuver.
The feedback oil circuit at shuttle valve 9 rear portion connected by overflow valve 2 on descending valve plate, electro-hydraulic proportional multi-way valve hoist action time, pressure oil promotes shuttle valve 9 to seal rear portion feedback oil circuit, pressure oil sets up pressure by feedback oil duct to off-load spool spring cavity, when pressure reaches main safety valve setting pressure, main safety valve opens overflow, when banked direction control valves does not hoist action and tilts with accessory connection work, pressure oil sets up pressure by the oil duct 1 of descending valve plate to off-load spool spring cavity, owing to overflow valve 2 pressure set points is less than main safety valve, when pressure reaches overflow valve 2 pressure, overflow opened by overflow valve 2, achieve the secondary pressure hoisting and tilting accessory.
Above-described embodiment is only presently preferred embodiments of the present invention, limits the scope of the invention the most according to this, therefore: the equivalence change that all structures under this invention, shape, principle are done, within protection scope of the present invention all should being covered by.
Claims (6)
1. the descending valve plate of a fork truck electro-hydraulic proportional multi-way valve, it is characterized in that: include valve body, overflow valve, counterbalance valve, proportional solenoid, recuperation valve and the commutation valve rod being arranged in valve body, described valve body both sides are provided with end cap, and the two ends of commutation valve rod extend to the lid intracavity of end cap；The pressure reduction that guide oil oil-in on the spool of proportional solenoid and guide oil oil return opening are formed is guided to lid intracavity and is promoted commutation valve rod to realize moving left and right；Being provided with oil duct one and actuator port in described valve body, be provided with oil-feed tank in described valve body, one end of described oil-feed tank connects with oil duct one；The spool of described recuperation valve is positioned at oil-feed tank；Described oil duct one is provided with main oil return opening, and described valve body is provided with the described counterbalance valve connected with main oil return opening；Being provided with the oil duct two connected with oil duct one on described valve body, described oil duct two is all connected with overflow valve and counterbalance valve；Cavity one and cavity two it is provided with in described commutation valve rod, it is provided with throttling pore one and throttling pore three on described commutation valve rod perisporium, when the valve rod that commutates moves right, described throttling pore one connects with actuator port, throttling pore three connects with main oil return opening, when the valve rod that commutates is moved to the left, described throttling pore one connects with main oil return opening, and throttling pore three connects with oil duct one.
The descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve the most according to claim 1, it is characterised in that: it is provided with shuttle valve on described valve body.
The descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve the most according to claim 1 and 2, it is characterised in that: described cavity one and cavity two are coaxially disposed, and described cavity one and cavity two extend to the middle part of commutation valve rod.
The descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve the most according to claim 1 and 2, it is characterised in that: described cavity one is symmetrical arranged with cavity two；Described oil duct one is arranged relative to the axisymmetrical of recuperation valve spool.
The descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve the most according to claim 1 and 2, it is characterized in that: described end cap includes end cap one and end cap two, described proportional solenoid includes controlling proportional solenoid one and the proportional solenoid two that reversing valve core moves, described proportional solenoid one is connected with end cap one by passage one, and described proportional solenoid two is connected with end cap two by passage two.
The descending valve plate of a kind of fork truck electro-hydraulic proportional multi-way valve the most according to claim 1 and 2, it is characterised in that: the spool of described recuperation valve extends in oil-feed tank in the lump through oil duct, and the spool lower end of described recuperation valve is provided with spring one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610339749.8A CN105822618B (en) | 2016-05-22 | 2016-05-22 | A kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610339749.8A CN105822618B (en) | 2016-05-22 | 2016-05-22 | A kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105822618A true CN105822618A (en) | 2016-08-03 |
| CN105822618B CN105822618B (en) | 2019-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610339749.8A Active CN105822618B (en) | 2016-05-22 | 2016-05-22 | A kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108253158A (en) * | 2016-12-28 | 2018-07-06 | 比亚迪股份有限公司 | Flow control valve and with its fork truck |
| CN110307200A (en) * | 2018-05-29 | 2019-10-08 | 林德（中国）叉车有限公司 | A kind of fork truck roll control system and method |
| CN110683484A (en) * | 2019-10-12 | 2020-01-14 | 武芳 | Vibration damper for telescopic arm forklift |
| CN112780628A (en) * | 2021-03-03 | 2021-05-11 | 徐州威世泽机电设备有限公司 | Reversing valve structure and multi-way valve |
| CN114294284A (en) * | 2021-12-26 | 2022-04-08 | 浙江海宏液压科技股份有限公司 | Working valve plate and electro-hydraulic proportional multi-way valve |
| CN114294281A (en) * | 2021-12-26 | 2022-04-08 | 浙江海宏液压科技股份有限公司 | Working valve plate and electro-hydraulic proportional multi-way valve |
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| CN205779975U (en) * | 2016-05-22 | 2016-12-07 | 浙江海宏液压科技股份有限公司 | A kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108253158A (en) * | 2016-12-28 | 2018-07-06 | 比亚迪股份有限公司 | Flow control valve and with its fork truck |
| CN110307200A (en) * | 2018-05-29 | 2019-10-08 | 林德（中国）叉车有限公司 | A kind of fork truck roll control system and method |
| CN110307200B (en) * | 2018-05-29 | 2021-04-20 | 林德（中国）叉车有限公司 | Forklift tilt control system and method |
| CN110683484A (en) * | 2019-10-12 | 2020-01-14 | 武芳 | Vibration damper for telescopic arm forklift |
| CN112780628A (en) * | 2021-03-03 | 2021-05-11 | 徐州威世泽机电设备有限公司 | Reversing valve structure and multi-way valve |
| CN114294284A (en) * | 2021-12-26 | 2022-04-08 | 浙江海宏液压科技股份有限公司 | Working valve plate and electro-hydraulic proportional multi-way valve |
| CN114294281A (en) * | 2021-12-26 | 2022-04-08 | 浙江海宏液压科技股份有限公司 | Working valve plate and electro-hydraulic proportional multi-way valve |
| CN114294284B (en) * | 2021-12-26 | 2024-04-09 | 浙江海宏液压科技股份有限公司 | Working valve plate and electrohydraulic proportional multi-way valve |
Also Published As
| Publication number | Publication date |
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| CN105822618B (en) | 2019-01-11 |
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