CN201962040U - Forklift hydraulic system with functions of priority and unloading - Google Patents

Forklift hydraulic system with functions of priority and unloading Download PDF

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Publication number
CN201962040U
CN201962040U CN2011200421905U CN201120042190U CN201962040U CN 201962040 U CN201962040 U CN 201962040U CN 2011200421905 U CN2011200421905 U CN 2011200421905U CN 201120042190 U CN201120042190 U CN 201120042190U CN 201962040 U CN201962040 U CN 201962040U
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CN
China
Prior art keywords
valve
oil
pressure
multiway
outlet
Prior art date
Application number
CN2011200421905U
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Chinese (zh)
Inventor
温跃清
马庆丰
余建福
田原
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安徽合力股份有限公司
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Priority to CN2011200421905U priority Critical patent/CN201962040U/en
Application granted granted Critical
Publication of CN201962040U publication Critical patent/CN201962040U/en

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Abstract

The utility model relates to a forklift hydraulic system with functions of priority and unloading, which comprises two oil pumps, a multiway valve, a load sensing diverter, a diversion oil cylinder, a lifting oil cylinder, an inclined oil cylinder, and the like, wherein the multiway valve is a sheet type multiway valve and comprises a priority valve, a lifting diversion valve and an inclined diversion valve; pressure oil is output by the first oil pump; part of the pressure oil is distributed into a diverter of a forklift through a CF port of the priority valve in the multiway valve, thereby controlling the deflection of a folklift body; and the other part of the pressure oil is converged with pressure oil output by the second oil pump from an EF port of the priority valve and then flows to the lifting oil cylinder and the inclined oil cylinder of the forklift by passing through the lifting diversion valve and the inclined diversion valve, thereby controlling the actions of lifting and descending as well as forward and backward inclination of the forklift; as the multiway valve is internally provided with an unloading valve and an electromagnetic valve to control the first oil pump to unload, the problem that the idling torque of an engine is not enough can be solved; the multiway valve is internally provided with a system main safety valve to conduct overload protection on a system; and the priority valve is connected with a diversion overflow valve, thereby preventing diversion pressure from being overhigh, and protecting a diversion system.

Description

Be with the fork truck hydraulic efficiency pressure system of preferential and unloading function
Technical field
The utility model belongs to the fork truck hydraulic efficiency pressure system, is specifically related to the fork truck hydraulic efficiency pressure system with preferential and unloading function.
Background technology
At present, the domestic multiway valve of continuing to use the monostable bypass type of fork truck hydraulic efficiency pressure system for many years, generally comprise the monostable flow divider valve that is installed on the oil-feed valve body and one group of multiple directional control valve that is the working oil path fuel feeding is formed, to satisfy that hoisting of fork of forklift truck descends and the requirement that function such as turns to of the anteversion and retroversion of door frame and car body.But along with fork truck improving constantly to the energy-conserving and environment-protective requirement, there is following point in existing hydraulic efficiency pressure system: 1, owing to adopt monostable shunting, so concerning system, even turning to oil circuit does not work, system still turns to oil circuit by the value sustainable supply of setting, and in this case, the flow of this oil circuit will lose with all being disabled, and be converted into system's heating and temperature rise, cause the reduction in system effectiveness and life-span.2, because fork truck adopts the vacuum blow-fed engine, and the idling moment of torsion is little, the fully loaded working engine that hoists of door frame is easily flame-out.3, this structure multiway valve has two hydraulic fluid ports, satisfies the needs of double pump fuel feeding, owing to do not have fender guard between two oil ducts, exists two pumps wherein to have one to break down, and will influence the use of another pump, and system works efficient is reduced greatly.
Summary of the invention
The system effectiveness that exists for the multiway valve of the monostable bypass type that solves the fork truck hydraulic efficiency pressure system is low and service life short, do not have problem such as fender guard between two oil ducts, and the utility model provides a kind of fork truck hydraulic efficiency pressure system of optimizing the preferential and unloading function of improved band.
Concrete Technological improvement plan is as follows:
Band fork truck hydraulic efficiency pressure system preferential and unloading function comprises first oil pump 1, multiway valve 2, load sensing deflector 3, turns to oil cylinder 4, lift oil tank 5, dump ram 6, second oil pump 7, oil suction oil filter 8, oil return oil filter 9 and fuel tank 10, connects by pipeline between described each parts; Described multiway valve 2 is the chip multiway valve, mainly comprises pressure-gradient control valve 21, lifting change-over valve 24 and inclination change-over valve 23.
The P1 mouth of the oil outlet of described first oil pump 1 on multiway valve 2 links to each other with pressure-gradient control valve 21, the LS mouth of pressure-gradient control valve 21 is communicated with the LS mouth of load sensing deflector 3 by signal oil circuit 11, one end of pressure-gradient control valve 21 is connected with and turns to by pass valve 22, turn to the outlet of by pass valve 22 to be communicated with oil return inlet T, an oil outlet CF of pressure-gradient control valve 21 is communicated to the P mouth of load sensing deflector 3 by oil circuit 12, another oil outlet EF of pressure-gradient control valve 21 is connected to the oil inlet of hoist change-over valve 24 and inclination change-over valve 23 respectively by oil circuit 25, the oil outlet A1 of change-over valve 24 of hoisting is connected to lift oil tank 5, and the first oil outlet A2 of inclination change-over valve 23 is connected with rodless cavity with the rod chamber of dump ram 6 respectively with the second oil outlet B2; Second oil pump, 7 delivery ports are being communicated with the P2 mouth of multiway valve 2, the P2 mouth of multiway valve 2 is divided into two-way by three-way pipe, the check valve 29 of leading up to is communicated with oil circuit 25, the inlet of cutoff port 30 built-in in unloader valve 27 inlets and the unloader valve 27 is linked on another road, the outlet of cutoff port 30 communicates with the inlet of electromagnetic valve 28, and the outlet of unloader valve 27 and electromagnetic valve 28 is communicated with oil return inlet T; Main safety valve 26 1 ends communicate with oil circuit 25, and the other end is communicated with oil return inlet T, and oil return inlet T communicates with fuel tank 10 by oil return oil filter 9.
The utility model is compared the advantage with following aspect with prior art products:
1, substitutes the monostable flow divider valve of legacy system configuration with pressure-gradient control valve, make flow become controlled variable, make that system can normally keep the necessary flow of control signal except that providing to preferential bleed off circuit bleed off circuit when turning to oil circuit not work, the flow of remainder will all be supplied with working connection.Can eliminate constant current like this to the loss in efficiency that turns to the oil circuit fuel feeding to cause, reduce degradation of energy and system's temperature rise, improve the purpose of system effectiveness thereby reach.Compare with original system, hoist equally under the situation of performance satisfying system, adopt the system of pressure-gradient control valve can reduce the discharge capacity of oil pump, further reduce the system power loss, cut down the consumption of energy;
2, utilize the solenoid control unloader valve of plug-in mounting, realize single pump off-load.Solved effectively because of the fully loaded out-of-action problem of the not enough fork truck of engine idle moment of torsion;
3, in an oil inlet of multiway valve, add check valve, prevent two in-line phase mutual interference, improve the reliability and stability of system.
Description of drawings
Fig. 1 is the utility model systematic schematic diagram (electromagnetic valve 28 is for often opening).
Sequence number is as follows among Fig. 1: 1, first oil pump 2, multiway valve 3, load sensing deflector 4, turn to oil cylinder 5, lift oil tank 6, dump ram 7, second oil pump 8, oil suction oil filter 9, oil return oil filter 10, fuel tank 11, signal oil circuit 12, oil circuit 21, pressure-gradient control valve 22, turn to by pass valve 23, inclination change-over valve 24, the change-over valve 25 that hoists, oil circuit 26, main safety valve 27, unloader valve 28, electromagnetic valve 29, check valve 30, cutoff port.
Fig. 2 is the normally closed systematic schematic diagram of the utility model electromagnetic valve 28.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described by embodiment.
Embodiment:
Referring to Fig. 1, band fork truck hydraulic efficiency pressure system preferential and unloading function comprises first oil pump 1, multiway valve 2, load sensing deflector 3, turns to oil cylinder 4, lift oil tank 5, dump ram 6, second oil pump 7, oil suction oil filter 8, oil return oil filter 9 and fuel tank 10, connects by pipeline between each parts.Multiway valve 2 is the chip multiway valve, mainly comprises pressure-gradient control valve 21, lifting change-over valve 24 and inclination change-over valve 23;
The P1 mouth of the oil outlet of first oil pump 1 on multiway valve 2 links to each other with pressure-gradient control valve 21, the LS mouth of pressure-gradient control valve 21 is communicated with the LS mouth of deflector 3 by signal oil circuit 11, one end of pressure-gradient control valve 21 is connected with steering safety valve 22, the outlet of steering safety valve 22 is communicated with oil return inlet T, an oil outlet CF of pressure-gradient control valve 21 is communicated to the P mouth of deflector 3 by oil circuit 12, another oil outlet EF of pressure-gradient control valve 21 is connected to the oil inlet of hoist change-over valve 24 and inclination change-over valve 23 respectively by oil circuit 25, the oil outlet A1 of change-over valve 24 of hoisting is connected to lift oil tank 5, and the first oil outlet A2 of inclination change-over valve 23 is connected with rodless cavity with the rod chamber of dump ram 6 respectively with the second oil outlet B2; Second oil pump, 7 delivery ports are being communicated with the P2 mouth of multiway valve 2, the P2 mouth of multiway valve 2 is divided into two-way by three-way pipe, the check valve 29 of leading up to is communicated with oil circuit 25, the inlet of cutoff port 30 built-in in unloader valve 27 inlets and the unloader valve 27 is linked on another road, the outlet of cutoff port 30 communicates with the inlet of electromagnetic valve 28, and the outlet of unloader valve 27 and electromagnetic valve 28 is communicated with oil return inlet T; Main safety valve 26 1 ends communicate with oil circuit 25, and the other end is communicated with oil return inlet T.
The pressure oil of the output of first oil pump 1, a part preferentially are diverted to the load sensing deflector 3 of fork truck by the CF mouth of pressure-gradient control valve built-in in the multiway valve 2 21.When steering hardware is not worked, the feedback pressure of the LS mouth of load sensing deflector 3 is almost nil, and pass to pressure-gradient control valve 21 by signal oil circuit 11, at this moment the pressure oil of the output of first oil pump 1 is removed the pressure oil of the 3~5L/min that keeps signal oil circuit 11 normal operation needs, all the other all are transported to the change-over valve 24 that hoists, inclination change-over valve 23 by the EF mouth by oil circuit 25, deliver to the lift oil tank 5 and the dump ram 6 of fork truck again, realize that hoisting of pallet fork descends and the anteversion and retroversion action.Thereby eliminated in the legacy system owing to the loss in efficiency that turns to the oil circuit over feeding to cause.When steering hardware is worked, the size of feedback steering effort during the Ls cause for gossip of load sensing deflector, pass to pressure-gradient control valve 21 by signal oil circuit 11, pressure-gradient control valve 21 transmits the size of pressure according to signal, the preferential supply turns to required flow, and surplus oil liquid is supplied with the lift oil tank 5 and the dump ram 6 of fork truck by oil circuit 25 by the EF mouth of pressure-gradient control valve 21.
The work of second oil pump 7 is divided into following two kinds of situations:
When engine operation during at idling mode (engine speed is set≤1100 rev/mins), electromagnetic valve 28 must not, the pressure oil of second oil pump, 7 outputs, the inlet of built-in cutoff port 30 in unloader valve 27 inlet and the unloader valve 27, because of electromagnetic valve 28 must not, the pressure oil of unloader valve 27 control oil channel by electromagnetic valve 28 directly and the oil return inlet T off-load that communicates, and unloader valve 27 is because the effect of its built-in cutoff port 30, on unloader valve 27, produce certain pressure reduction, this pressure reduction promotes unloader valve 27 and moves to position, a left side, make the left side position of pressure oil by unloader valve 27 of second oil pump 7 output communicate 7 off-loads of second oil pump with oil return inlet T.At this moment have only first oil pump 1 band to carry work, avoided the double pump band to carry work and the engine idle moment of torsion is not enough can cause flame-out problem.
When engine speed 〉=1100 rev/min, fork truck electric appliance control box output high potential, electromagnetic valve 28 gets electric work, electromagnetic valve 28 is obstructed with oil return, make unloader valve 27 and drainback passage also close, the pressure oil of second oil pump, 7 outputs is communicated with oil circuit 25 by check valve 29, the lift oil tank 5 and the dump ram 6 that also collaborate to give altogether fork truck by the fluid of oil circuit 25 with the EF mouth of pressure-gradient control valve 21 is exported descend and the anteversion and retroversion action with hoisting of control pallet fork.
Described electromagnetic valve 28, shown in Figure 1 is normally open solenoid valve, electromagnetic valve 28 also can be set to normally closed solenoid valve, sees Fig. 2, service condition and above-mentioned just in time opposite.Promptly when engine operation during at idling mode (engine speed is set≤1100 rev/mins), electromagnetic valve 28 electric off-load, unloader valve 27 moves to position, a left side, the off-load that communicates with oil return inlet T of the left side position of the pressure oil of second oil pump, 7 outputs by unloader valve 27.When engine speed 〉=1100 rev/min, electromagnetic valve 28 must not, electromagnetic valve 28 is obstructed with oil return, unloader valve 27 is also closed with drainback passage, the pressure oil of second oil pump, 7 outputs, be communicated with oil circuit 25 by check valve 29, the lift oil tank 5 and the dump ram 6 that also collaborate to give altogether fork truck by the fluid of oil circuit 25 with the EF mouth of pressure-gradient control valve 21 is exported descend and the anteversion and retroversion action with hoisting of control pallet fork.

Claims (1)

1. be with the fork truck hydraulic efficiency pressure system of preferential and unloading function, comprise first oil pump (1), multiway valve (2), load sensing deflector (3), turn to oil cylinder (4), lift oil tank (5), dump ram (6), second oil pump (7), oil suction oil filter (8), oil return oil filter (9) and fuel tank (10), connect by pipeline between described each parts; It is characterized in that: described multiway valve (2) is the chip multiway valve, mainly comprises pressure-gradient control valve (21), lifting change-over valve (24) and inclination change-over valve (23);
The P1 mouth of the oil outlet of described first oil pump (1) on multiway valve (2) links to each other with pressure-gradient control valve (21), the LS mouth of pressure-gradient control valve (21) is communicated with the LS mouth of load sensing deflector (3) by signal oil circuit (11), one end of pressure-gradient control valve (21) is connected with and turns to by pass valve (22), turn to the outlet of by pass valve (22) to be communicated with oil return inlet T, an oil outlet CF of pressure-gradient control valve (21) is communicated to the P mouth of load sensing deflector (3) by oil circuit (12), another oil outlet EF of pressure-gradient control valve (21) is connected to the oil inlet of change-over valve that hoists (24) and inclination change-over valve (23) respectively by oil circuit (25), the oil outlet (A1) of change-over valve (24) of hoisting is connected to lift oil tank (5), and first oil outlet (A2) of inclination change-over valve (23) is connected with rodless cavity with the rod chamber of dump ram (6) respectively with second oil outlet (B2); Second oil pump (7) delivery port is being communicated with the P2 mouth of multiway valve (2), (P2) of multiway valve (2) mouthful is divided into two-way by three-way pipe, the check valve (29) of leading up to is communicated with oil circuit (25), the inlet of cutoff port (30) built-in in unloader valve (27) inlet and the unloader valve (27) is linked on another road, the outlet of cutoff port (30) communicates with the inlet of electromagnetic valve (28), and the outlet of unloader valve (27) and electromagnetic valve (28) is communicated with oil return inlet T; Main safety valve (26) one ends communicate with oil circuit (25), and the other end is communicated with oil return inlet T, and oil return inlet T communicates with fuel tank (10) by oil return oil filter (9).
CN2011200421905U 2011-02-21 2011-02-21 Forklift hydraulic system with functions of priority and unloading CN201962040U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200421905U CN201962040U (en) 2011-02-21 2011-02-21 Forklift hydraulic system with functions of priority and unloading

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200421905U CN201962040U (en) 2011-02-21 2011-02-21 Forklift hydraulic system with functions of priority and unloading

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Publication Number Publication Date
CN201962040U true CN201962040U (en) 2011-09-07

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102678650A (en) * 2012-06-12 2012-09-19 浙江海宏液压科技股份有限公司 Double-pump converging oil-filling valve
CN102734245A (en) * 2012-07-06 2012-10-17 浙江海克力液压有限公司 Preferential-type variable steering control valve
CN103264725A (en) * 2013-05-28 2013-08-28 安徽合力股份有限公司 Safe steering system of heavy forklift
CN103291673A (en) * 2012-02-01 2013-09-11 罗伯特·博世有限公司 A hydraulic control arrangement
CN103470556A (en) * 2013-08-30 2013-12-25 湖南三一路面机械有限公司 Multi-way valve converging hydraulic system and land leveler
CN103787225A (en) * 2014-02-28 2014-05-14 四川川润液压润滑设备有限公司 Jack hydraulic system
CN103910311A (en) * 2014-04-10 2014-07-09 安徽合力股份有限公司 Hydraulic system of empty container stacking locomotive
CN104150402A (en) * 2013-05-13 2014-11-19 株式会社丰田自动织机 Industrial vehicle and method for controlling industrial vehicle
CN104179739A (en) * 2014-08-13 2014-12-03 徐州重型机械有限公司 Dual-pump bidirectional confluence control system and fire truck adopting same
CN104454692A (en) * 2014-11-27 2015-03-25 贵州精立航太科技有限公司 Hydraulic system for thread roller
CN104627910A (en) * 2015-02-04 2015-05-20 阜新捷力液压科技有限公司 Intelligent load sensing hydraulic system of electric forklift
TWI486529B (en) * 2012-12-19 2015-06-01 Shimadzu Corp Hydraulic circuit and loading and unloading vehicle
CN104832485A (en) * 2015-05-19 2015-08-12 江苏柳工机械有限公司 Hydraulic control system for backhoe loader
CN107226436A (en) * 2016-03-24 2017-10-03 株式会社丰田自动织机 Current control device
CN108910789A (en) * 2018-09-28 2018-11-30 邵延荣 Control valve group and electric forklift hydraulic system for electric forklift hydraulic system
CN109311648A (en) * 2016-06-20 2019-02-05 川崎重工业株式会社 Fluid power system

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103291673A (en) * 2012-02-01 2013-09-11 罗伯特·博世有限公司 A hydraulic control arrangement
CN103291673B (en) * 2012-02-01 2016-09-28 罗伯特·博世有限公司 Hydraulic control system
CN102678650A (en) * 2012-06-12 2012-09-19 浙江海宏液压科技股份有限公司 Double-pump converging oil-filling valve
CN102678650B (en) * 2012-06-12 2014-12-17 浙江海宏液压科技股份有限公司 Double-pump converging oil-filling valve
CN102734245B (en) * 2012-07-06 2015-05-27 浙江海克力液压有限公司 Preferential-type variable steering control valve
CN102734245A (en) * 2012-07-06 2012-10-17 浙江海克力液压有限公司 Preferential-type variable steering control valve
TWI486529B (en) * 2012-12-19 2015-06-01 Shimadzu Corp Hydraulic circuit and loading and unloading vehicle
CN104150402B (en) * 2013-05-13 2016-10-12 株式会社丰田自动织机 Industrial vehicle and the method being used for controlling industrial vehicle
CN104150402A (en) * 2013-05-13 2014-11-19 株式会社丰田自动织机 Industrial vehicle and method for controlling industrial vehicle
US10018270B2 (en) 2013-05-13 2018-07-10 Kabushiki Kaisha Toyota Jidoshokki Industrial vehicle and method for controlling industrial vehicle
CN103264725A (en) * 2013-05-28 2013-08-28 安徽合力股份有限公司 Safe steering system of heavy forklift
CN103470556B (en) * 2013-08-30 2016-07-27 湖南三一路面机械有限公司 A kind of banked direction control valves combining hydraulic system and land leveller
CN103470556A (en) * 2013-08-30 2013-12-25 湖南三一路面机械有限公司 Multi-way valve converging hydraulic system and land leveler
CN103787225A (en) * 2014-02-28 2014-05-14 四川川润液压润滑设备有限公司 Jack hydraulic system
CN103787225B (en) * 2014-02-28 2016-08-24 四川川润液压润滑设备有限公司 jack hydraulic system
CN103910311A (en) * 2014-04-10 2014-07-09 安徽合力股份有限公司 Hydraulic system of empty container stacking locomotive
CN104179739A (en) * 2014-08-13 2014-12-03 徐州重型机械有限公司 Dual-pump bidirectional confluence control system and fire truck adopting same
CN104179739B (en) * 2014-08-13 2016-08-17 徐州重型机械有限公司 The two-way Confluent control system of double pump and apply the fire fighting truck of this system
CN104454692A (en) * 2014-11-27 2015-03-25 贵州精立航太科技有限公司 Hydraulic system for thread roller
CN104627910A (en) * 2015-02-04 2015-05-20 阜新捷力液压科技有限公司 Intelligent load sensing hydraulic system of electric forklift
CN104627910B (en) * 2015-02-04 2017-03-22 阜新阜太泵业制造有限公司 Intelligent load sensing hydraulic system of electric forklift
CN104832485A (en) * 2015-05-19 2015-08-12 江苏柳工机械有限公司 Hydraulic control system for backhoe loader
CN107226436A (en) * 2016-03-24 2017-10-03 株式会社丰田自动织机 Current control device
CN107226436B (en) * 2016-03-24 2019-05-14 株式会社丰田自动织机 Current control device
CN109311648A (en) * 2016-06-20 2019-02-05 川崎重工业株式会社 Fluid power system
CN109311648B (en) * 2016-06-20 2021-03-12 川崎重工业株式会社 Hydraulic drive system
CN108910789A (en) * 2018-09-28 2018-11-30 邵延荣 Control valve group and electric forklift hydraulic system for electric forklift hydraulic system
CN108910789B (en) * 2018-09-28 2019-12-27 江苏南京白马现代农业高新技术产业园有限公司 Control valve group for hydraulic system of electric forklift and hydraulic system of electric forklift

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Granted publication date: 20110907

Termination date: 20200221