CN203078292U - Driving hydraulic system for walking of universal forklift - Google Patents
Driving hydraulic system for walking of universal forklift Download PDFInfo
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- CN203078292U CN203078292U CN 201220693345 CN201220693345U CN203078292U CN 203078292 U CN203078292 U CN 203078292U CN 201220693345 CN201220693345 CN 201220693345 CN 201220693345 U CN201220693345 U CN 201220693345U CN 203078292 U CN203078292 U CN 203078292U
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- walking
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- forklift
- hydraulic
- universal forklift
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Abstract
The utility model provides a driving hydraulic system for walking of a universal forklift. The driving hydraulic system for walking of the universal forklift comprises a variable pump, an electrohydraulic control unit and hydraulic motors. The electrohydraulic control unit is respectively connected with the variable pump and the hydraulic motors. The driving hydraulic system for walking of the universal forklift has the advantages of removing the contradiction between reduction of the size of a vehicle body and improvement of power performance, omitting a complex motor control system and hub reduction gears, and giving full play to the advantages of a hydraulic driving system, wherein the hydraulic driving system has the advantages of being easy and convenient to control, high in power density and compact in structure. The design of the driving hydraulic system for walking of the universal forklift passes through deep demonstration, calculation and extensive research, the driving hydraulic system for walking of the universal forklift fully satisfies the requirements of safety and energy saving, and components of an assembly are mature and advanced, model selection is reasonable and confirmation of technical indexes is proper.
Description
Technical field
The present invention relates to a kind of engineering machinery field equipment, especially a kind of universal forklift-walking drives hydraulic efficiency pressure system.
Background technology
Fork truck is a kind of loading-unload machine that level transportation and vertical lift are effectively combined, comprehensive functions such as loading and unloading, lifting and transportation are arranged, have advantages such as high efficiency, easy for operation and maneuverability, be widely used in places such as factories and miness, warehouse, station, harbour, circulation or DISTRIBUTION CENTRE.Because the fork truck volume is less, can enter small space operations such as cabin and warehouse.So can be fully used in the space.Common fork truck generally all adopts rear-axle steering, and when fork was got goods, turning rate was more frequent.And corner is bigger.Therefore, relatively more difficult at narrow job space, influence operating efficiency.
Universal fork truck then possesses the function in the walking of plane any direction, is applicable to goods fork dress and short-distance transport in the narrow place.The running gear of universal fork truck adopts Mecanum spiral roller (Mecanum Wheel) actuation techniques usually, 4 roller mirror-image arrangement, individual drive is controlled the hand of rotation and the speed of 4 rollers respectively by bar handle, can powered vehicle travel on any direction of plane.Mecanum spiral roller structure appears at 1973 the earliest, and American in 1997 universal handling machinery that begins one's study was developed later the carrying vehicle based on Mecanum spiral shell wheel, but mostly is little tonnage, motor drive mode greatly in 2002 in the world gradually.College of Military Traffic, PLA at first succeeds in developing 1 ton of universal fork truck at home, promptly adopt the wheel motor 1 that revolves roller 3 that the type of drive of wheel reduction gear 2 is set, electric machine control system and drive mechanism are all comparatively complicated, and scantling of structure is bigger, and its wheel set structure as shown in Figure 1.
The general vehicle that adopts hydraulic moving to drive adopts controllable capacity pump to cooperate the closed circuit volumetric speed control mode of variable-dis-placement motor more.This circuit efficiency height, fuel tank capacity is little.But 4 CD-ROM drive motor of universal fork truck need independent control, and its rotating speed size and Orientation may be all inequality, therefore can't realize respectively 4 motors being carried out regulating control by 1 controllable capacity pump.And depend merely on the quantitative control of motor, the characteristics that output torque reduces during its discharge capacity commutation do not meet the vehicle ' rule.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, provide a kind of universal forklift-walking of the pressure-flow control mode of open circuit that adopts to drive hydraulic efficiency pressure system, thereby make the body construction of universal fork truck compact more, the power performance of vehicle and road surface better adaptability.
For addressing the above problem, a kind of universal forklift-walking of the present invention drives hydraulic efficiency pressure system, comprises controllable capacity pump, electrohydraulic control unit and HM Hydraulic Motor, and wherein electrohydraulic control unit links to each other with HM Hydraulic Motor with controllable capacity pump respectively.
Described controllable capacity pump is inclined disc type shaft orientation plunger variable pump.
Described HM Hydraulic Motor is the low-speed big radial plunger piston motor.
Described electrohydraulic control unit comprises electric control handle, electronic amplifier and the high voltage load sensing multiway valve that links to each other successively, and described high voltage load sensing multiway valve is connected between HM Hydraulic Motor and the controllable capacity pump.
Described universal forklift-walking drives hydraulic efficiency pressure system and also comprises service brake valve piece, and this service brake valve piece is arranged between HM Hydraulic Motor and the high voltage load sensing multiway valve.
Adopt universal forklift-walking of the present invention to drive hydraulic efficiency pressure system, compared with prior art, have following beneficial effect:
1) adopt hydraulic-driven to drive than electricity, its dynamic index obviously improves, and the result oppositely checks the car load dynamic index according to the hydraulic unit type selecting, and maximum speed can improve 25%, and the wheel max. output torque improves 38%, and its climbing performance from dead stop also will have corresponding raising;
2) because the low-speed big radial plunger piston motor compact conformation of selecting for use, oad is little, and saved wheel reduction gear of the prior art, the more original motor of its axial dimension cooperates reducer structure to reduce more than the 200mm, provides the space for further reducing body width;
3) adopt hydraulically powered universal fork truck can give full play to the advantage that the hydrostatic drive output torque is big, low-speed stability is good, further improve the riding stability and the crossing ability of vehicle.
Description of drawings
Fig. 1 is a universal fork truck drive system scheme drawing in the prior art.
Fig. 2 drives the hydraulic system structure block diagram for the universal forklift-walking of the present invention.
Fig. 3 drives hydraulic system principle figure for the universal forklift-walking of the present invention.
Among the figure: wheel motor 1; Wheel reduction gear 2; Revolve roller 3; Service brake valve piece 4; Low-speed big radial plunger piston motor 5; The oil return connection 6 of high voltage load sensing multiway valve; Inclined disc type shaft orientation plunger variable pump 7; The oil-feed connection 8 of high voltage load sensing multiway valve; The change-over valve connection 9 of high voltage load sensing multiway valve
The specific embodiment
In order to make those skilled in the art person understand technical solution of the present invention better, the present invention is described in further detail below in conjunction with drawings and embodiments.
Shown in Fig. 2,3, universal forklift-walking of the present invention drives hydraulic efficiency pressure system, comprises inclined disc type shaft orientation plunger variable pump, low-speed big radial plunger piston motor, service brake valve piece, electric control handle, electronic amplifier and high voltage load sensing multiway valve.
Wherein electric control handle, electronic amplifier link to each other successively with high voltage load sensing multiway valve, high voltage load sensing multiway valve links to each other with service brake valve piece with inclined disc type shaft orientation plunger variable pump respectively, service brake piece correspondence links to each other with the low-speed big radial plunger piston motor, the low-speed big radial plunger piston motor is used to drive universal fork truck wheel, and each is taken turns correspondence a low-speed big radial plunger piston motor is set.
Described inclined disc type shaft orientation plunger variable pump, model are A10VO 45 DFR/31R-P R C 12 K01, nominal pressure 28MPa, peak pressure 35MPa, discharge capacity 45mL, pressure flow control.
Described high voltage load sensing multiway valve, model M4-12-1X/, latus rectum 12mm closes the core formula, nominal pressure 27MPa(pump side), 42MPa(actr side), be with inner guide to supply with; Oil-feed connection 4M4-12-1X/J270Y V01, main safety valve 27MPa; Change-over valve connection S M-M J 020-020 W2 1 K Q V01, band pressure compensation and load keep function, no LS by pass valve, band is measured interface, spool function J, flow 20L/min, electric-hydraulic proportion control, power line voltage 24V; Oil return connection LA V01, connecting panel, no hydraulic fluid port, viton sealing.
Described low-speed big radial plunger piston motor, model MCR03F 160 F180 Z-3X/B2 M/01/S, wheel motor, discharge capacity 160mL, maximum working pressure 45MPa, hydraulic pressure discharges parking brake, the nitrile rubber sealing, band is installed wheel bolt.
Described service brake valve piece, model VBSO-DE-VF-30-FM, control presssure 21MPa, maximum flow 60L/min.
Described electronic amplifier, model: MHVA 8B1X/24D, the amplifier of 4 axles of control, operating voltage 24VDC, direct control proportion electro-magnet.
Described electric control handle, model 8THE 5-1X, power line voltage 24V, maximum current 5A, export ratio electric current 0～2.5A.
Universal fork truck fluid power system of the present invention, (1) pressure-flow control controllable capacity pump of employing on-load sensing, the variable control valve of pump can be according to system load size and traffic demand size (being directional control valve valve port size), by variable cylinder automatically regulating discharge capacity and delivery rate.Big and the load of flow hour increases discharge capacity; (2) direction-control of adopting proportional pressure-reducing valve to control.The control of pressure motor is realized by the electro-hydraulic reversing valve that adopts proportional pressure-reducing valve control, the delivery pressure of proportional pressure-reducing valve is regulated by the output voltage of electric control handle, this pressure is in the commutation of control change-over valve, accurately regulate change-over valve valve port opening size, thus the input flow rate and the rotating speed thereof of control motor; (3) keep the constant load pressure compensation control of delivery rate.Pressure-compensated valve can keep the constant of delivery rate automatically when the variation of motor load; (4) HM Hydraulic Motor band parking brake.When stopping, brake activation valve group delivery pressure is less than setting pressure, and the motor brake belleville spring discharges, and realizes stopping brake.In addition, travel driving system controllable capacity pump band axis interface can be connected with fork truck equipment Hydraulic Pump.
Universal fork truck fluid power system adopts the pressure-flow control mode of open circuit among the present invention.Universal fork truck by static control process to motion is: change-over valve connection → proportional pressure-flow signal → proportional radial plunger piston motor moment of torsion-rotating speed of electric control handle swing certain angle → proportional voltage signal → electronic amplifier → proportional current signal → high voltage load sensing multiway valve-turn to (valve of service brake simultaneously piece is exported certain control presssure, and the braking during standstill of motor is opened) → wheel.For improving overall work efficient, adopt the controllable capacity pump fuel feeding, according to system's total flow demand automatically regulating pump oil drain quantity.Universal fork truck by moving to static control process is: electric control handle pendulum angle vanishing → voltage signal is that zero → electronic amplifier → current signal is that the change-over valve connection → pressure-flow signal of zero → high voltage load sensing multiway valve is zero → radial plunger piston motor → realize that by service brake valve piece service brake → faster rotating wheel reduces to zero (valve of service brake simultaneously piece pressure output control reduces to zero, motor realization braking during standstill).
In sum, universal forklift-walking drives Design of Hydraulic System and has solved the contradiction that reduces body dimensions and improve tractive performance, saved complicated electric machine control system and wheel reduction gear, given full play to that fluid power system control is easy, power density big, the advantage of compact conformation.In-depth studying, calculating and extensively investigation have been passed through in system design, and hydraulic circuit has demonstrated fully safety and energy-conservation requirement, and the assembly parts are ripe advanced, and type selecting is reasonable, and technical index is determined appropriate.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a universal forklift-walking drives hydraulic efficiency pressure system, and it is characterized in that: comprise controllable capacity pump, electrohydraulic control unit and HM Hydraulic Motor, wherein electrohydraulic control unit links to each other with HM Hydraulic Motor with controllable capacity pump respectively.
2. universal according to claim 1 forklift-walking drives hydraulic efficiency pressure system, and it is characterized in that: described controllable capacity pump is inclined disc type shaft orientation plunger variable pump.
3. drive hydraulic efficiency pressure system as universal forklift-walking as described in the claim 2, it is characterized in that: described HM Hydraulic Motor is the low-speed big radial plunger piston motor.
4. drive hydraulic efficiency pressure system as universal forklift-walking as described in the claim 3, it is characterized in that: described electrohydraulic control unit comprises electric control handle, electronic amplifier and the high voltage load sensing multiway valve that links to each other successively, and described high voltage load sensing multiway valve is connected between HM Hydraulic Motor and the controllable capacity pump.
5. drive hydraulic efficiency pressure system as universal forklift-walking as described in the claim 4, it is characterized in that: described universal forklift-walking drives hydraulic efficiency pressure system and also comprises service brake valve piece, and this service brake valve piece is arranged between HM Hydraulic Motor and the high voltage load sensing multiway valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220693345 CN203078292U (en) | 2012-12-14 | 2012-12-14 | Driving hydraulic system for walking of universal forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220693345 CN203078292U (en) | 2012-12-14 | 2012-12-14 | Driving hydraulic system for walking of universal forklift |
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| CN203078292U true CN203078292U (en) | 2013-07-24 |
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| CN 201220693345 Expired - Fee Related CN203078292U (en) | 2012-12-14 | 2012-12-14 | Driving hydraulic system for walking of universal forklift |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103009996A (en) * | 2012-12-14 | 2013-04-03 | 中国人民解放军军事交通学院 | Hydraulic walking driving system of universal forklift |
-
2012
- 2012-12-14 CN CN 201220693345 patent/CN203078292U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103009996A (en) * | 2012-12-14 | 2013-04-03 | 中国人民解放军军事交通学院 | Hydraulic walking driving system of universal forklift |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20141214 |
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| EXPY | Termination of patent right or utility model |