CN201347345Y - Fork truck quantitative hydraulic load sensing device - Google Patents
Fork truck quantitative hydraulic load sensing device Download PDFInfo
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- CN201347345Y CN201347345Y CN 200820300922 CN200820300922U CN201347345Y CN 201347345 Y CN201347345 Y CN 201347345Y CN 200820300922 CN200820300922 CN 200820300922 CN 200820300922 U CN200820300922 U CN 200820300922U CN 201347345 Y CN201347345 Y CN 201347345Y
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- pressure
- over valve
- load
- fork truck
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Abstract
A fork truck quantitative hydraulic load sensing device for fork truck hydraulic system has a three-way pressure compensator and a two-way pressure compensator, the two-way pressure compensator is arranged between a changing-over valve and an actuator element, an Ls1 end of the two-way pressure compensator is connected with an Ls end of the three-way pressure compensator, an oil inlet end of the two-way pressure compensator is communicated with an E end of the changing-over valve, an oil outlet end D is communicated with an F end of the changing-over valve, the device has advantages that adopting the load sensing, the system only provides the flow required by the actuator element, the redundant flow can be overflowed to the oil tank by opening the oil tank through the three-way pressure compensator according to the pressure of the system overcoming the actual load, the actuator elements entering into the small load are relative less, the actuator elements entering into the large load are relative more, when performing the compound motion, the action coordinating performance can be implemented; the system overflow pressure can change caused by the change of the maximum load with the actuator element, the energy-saving effect of the fork truck hydraulic system can be reinforced obviously.
Description
Technical field
The utility model relates to a kind of quantitative hydraulic pressure load sensing of fork truck device that is used for the fork truck hydraulic efficiency pressure system.
Background technology
At present, the hydraulic efficiency pressure system that fork truck usually adopts is out that all the meta multiple directional control valve controls each action, sees Fig. 2.Be characterized in: realized fork truck lifting, inclination, action such as auxiliary, because each loop parallel connection when carrying out composite move, the action earlier of the less power element of load must occur being subjected to, be subjected to the phenomenon of moving behind the big power element of load, composite move can not be coordinated; And determine according to overcoming the required pressure of maximum load because of system pressure this moment, hour can cause main safety valve to open in multiway valve valve rod aperture efficiency and overflow back fuel tank by rated pressure, it is bigger that system produces loss of pressure, causes system's heating and cause degradation of energy.
Summary of the invention
The purpose of this utility model just provides a kind of quantitative hydraulic pressure load sensing of fork truck device that adopts the fix-displacement pump fuel feeding, system only offers the required flow of power element, unnecessary flow overcomes the required pressure of actual loading by the three-way pressure compensating device by system to be opened and overflows back fuel tank, and system produces that loss of pressure is smaller, system's heating is just smaller.When a plurality of valve rods of operation carry out composite move, system compares the pressure Ls1 of each valve rod by the shuttle valve network, by overcoming required that pressure Ls1 of maximum load is that Ls sets, if certain power element load is little, two logical pressure compensators 3 on that loop will turn down opening at this moment, make that the flow that enters into the little power element of load is few; And the big power element of load is big because of the opening of two logical pressure compensators 3, make that the flow that enters is more relatively, can realize the harmony of moving when carrying out composite move like this, the maximum load that system's oil pressure relief is subjected to along with power element changes and changes, and has strengthened the energy-saving effect of fork truck hydraulic efficiency pressure system very significantly.
Solution of the present utility model is such: this device has three-way pressure compensating device and two logical pressure compensators, described two logical pressure compensators are to receive between change-over valve and the power element, the Ls1 of two logical pressure compensators terminates to the Ls end of three-way pressure compensating device, and the oil inlet end of two logical pressure compensators is communicated with the E of change-over valve end, oil outlet end D is communicated with the F end of change-over valve.
Above-mentioned a plurality of control units are connected into system, just can be to controlling the work of lifting, inclination, auxiliary three power elements respectively.
The utility model has the advantages that and adopt the load feedback, system only offers the required flow of power element, unnecessary flow overcomes the required pressure of actual loading by the three-way pressure compensating device by system and opens and overflow back fuel tank, the flow that enters into the little power element of load is little relatively less because of the opening of two logical pressure compensators, and the flow that enters into the big power element of load is more greatly relatively because of the opening of two logical pressure compensators, can realize the harmony of moving when carrying out composite move; The maximum load that system's oil pressure relief is subjected to along with power element changes and changes, and has strengthened the energy-saving effect of fork truck hydraulic efficiency pressure system very significantly.
Description of drawings
Accompanying drawing is embodiment of the present utility model.
Accompanying drawing 1 is control unit structural representation of the utility model.
Accompanying drawing 2 be fork truck usually adopt open meta valve scheme drawing.
Accompanying drawing 3 is the utility model complete structure scheme drawings when being used for fork truck.
The specific embodiment
A control unit of the present utility model as shown in Figure 1, in accompanying drawing 1, have three-way pressure compensating device 1 and two logical pressure compensators 3, described two logical pressure compensators 3 are to receive between change-over valve 2 and the power element, the Ls1 of two logical pressure compensators 3 terminates to the Ls end of three-way pressure compensating device 1, and the oil inlet end C1 of two logical pressure compensators 3 is communicated with the E1 of change-over valve 2 end, oil outlet end D1 is communicated with the F1 end of change-over valve 2.Described change-over valve 2 at two control positioies at that time, pressure oil circuit P end is all held with E1 and is communicated with.
Described change-over valve 2 is when two control positioies, and pressure oil circuit P end at first enters change-over valve 2, enters two logical pressure compensators 3 after the valve rod throttling, enters actuator port A1 or B1 through change-over valve 2 once more at last; This pressure oil also acts on the Ls1 mouth simultaneously, is communicated with the Ls end by shuttle valve network 4.
Accompanying drawing 3 is the structural representation of the complete quantitative hydraulic pressure load sensing of fork truck device, is parallel with three control units at pressure oil circuit P end, controls lifting (A1, B1) respectively, tilts (A2, B2), the work of auxiliary (A3, B3) three power elements.
Be elaborated with regard to 3 pairs of working processs of the present utility model of accompanying drawing now:
Working process has following several: 1. when multiway valve change-over valve 2 is failure to actuate, and the zero load feedback signal of Ls oil circuit, the by pass valve in the three-way pressure compensating device 1 is opened with minimum pressure, plays the off-load effect; This moment, the oil of gear type pump flowed back to fuel tank from by pass valve; Because of the response pressure of by pass valve is very little, so the loss of pressure that causes is also very little, this moment and traditional fork truck adopt opens the meta system similarity, and promptly the fix-displacement pump fluid of discharging directly flows back to fuel tank.2. when single group oil cylinder moves (is example with the elevating ram), the pressure oil of gear type pump is because the action of change-over valve 2 spools, be communicated with the oil inlet end C1 oil duct of two logical pressure compensators 3, two logical pressure compensators 3 are under the effect of C1 oil duct pressure oil, spool moves to left and is in the rightmost state, C1 is communicated with D1, pressure oil leads to elevating ram provides power, load feedback oil circuit Ls1 is communicated with D1 simultaneously, Ls1 offers 1 one load pressure signals of three-way pressure compensating device, by pass valve response pressure in the three-way pressure compensating device 1 will be with the change in pressure of load at this moment, the system pressure that has overcome common employing is determined according to overcoming the required pressure of maximum load, hour can cause main safety valve 5 to open the problem that overflows back fuel tank by rated pressure in multiway valve valve rod aperture efficiency, system pressure loss and heating obviously reduce.3. when many group oil cylinders move, Ls1, Ls1-1, the load pressure signal D1 of control oil channel is separately all arranged on figure for Ls1-2 number, D1-1, D1-2, but because of this three road load signal is in parallel, so when the pressure of hypothesis elevating ram this moment is maximum, be D1, D1-1, the D1-2 D1 maximum of comparing, the load signal pressure maximum of Ls1, the by pass valve response pressure of three-way pressure compensating device is just determined by the elevating ram of load maximum, the left side of two logical pressure compensators 31 and two logical pressure compensators 32 is subjected to the signal pressure effect of Ls1, spool moves right, this just makes that two relatively large logical pressure compensator openings of load are big relatively, and the less relatively two logical pressure compensator openings of load are relatively littler, like this when fork truck carries out composite move, each action can be moved simultaneously, show good coordination and flow distribution according to need property.
Claims (2)
1. the quantitative hydraulic pressure load sensing of fork truck device, it is characterized in that having three-way pressure compensating device (1) and two logical pressure compensators (3), described two logical pressure compensators (3) are to receive between change-over valve (2) and the power element, the Ls1 of two logical pressure compensators (3) terminates to the Ls end of three-way pressure compensating device (1), and the oil inlet end (C1) of two logical pressure compensators (3) is communicated with the E1 of change-over valve (2) end, oil outlet end (D1) is communicated with the F1 end of change-over valve (2).
2. the quantitative hydraulic pressure load sensing of fork truck according to claim 1 device, it is characterized in that described change-over valve (2) is when two control positioies, pressure oil circuit (P) end at first enters change-over valve (2), after the valve rod throttling, enter two logical pressure compensators (3), pass through change-over valve (2) at last once more and enter actuator port (A1) or (B1); This pressure oil also acts on the Ls1 mouth simultaneously, is communicated with the Ls end by shuttle valve network (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820300922 CN201347345Y (en) | 2008-05-29 | 2008-05-29 | Fork truck quantitative hydraulic load sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820300922 CN201347345Y (en) | 2008-05-29 | 2008-05-29 | Fork truck quantitative hydraulic load sensing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201347345Y true CN201347345Y (en) | 2009-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820300922 Expired - Lifetime CN201347345Y (en) | 2008-05-29 | 2008-05-29 | Fork truck quantitative hydraulic load sensing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201347345Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251996A (en) * | 2011-07-05 | 2011-11-23 | 天津柳工机械有限公司 | Engineering mechanical load sensing hydraulic system |
| CN101737369B (en) * | 2010-01-14 | 2012-01-18 | 戴豫 | Dynamic load sensing priority and shunt type multiple-way directional valve |
| CN103291673A (en) * | 2012-02-01 | 2013-09-11 | 罗伯特·博世有限公司 | A hydraulic control arrangement |
| CN108612696A (en) * | 2018-05-30 | 2018-10-02 | 圣邦集团有限公司 | Environmental sanitation cleaning vehicle hydraulic control system |
-
2008
- 2008-05-29 CN CN 200820300922 patent/CN201347345Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737369B (en) * | 2010-01-14 | 2012-01-18 | 戴豫 | Dynamic load sensing priority and shunt type multiple-way directional valve |
| CN102251996A (en) * | 2011-07-05 | 2011-11-23 | 天津柳工机械有限公司 | Engineering mechanical load sensing hydraulic system |
| 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 |
| CN108612696A (en) * | 2018-05-30 | 2018-10-02 | 圣邦集团有限公司 | Environmental sanitation cleaning vehicle hydraulic control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Liuzhou LiuGong Fork Truck Co., Ltd. Assignor: Guangxi Liugong Machinery Co., Ltd. Contract record no.: 2010450000068 Denomination of utility model: Fork truck quantitative hydraulic load sensing device Granted publication date: 20091118 License type: Exclusive License Record date: 20100830 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091118 |