CN208980278U - A kind of Multifunctional AC electri forklift hydraulic control system - Google Patents
A kind of Multifunctional AC electri forklift hydraulic control system Download PDFInfo
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- CN208980278U CN208980278U CN201821681384.8U CN201821681384U CN208980278U CN 208980278 U CN208980278 U CN 208980278U CN 201821681384 U CN201821681384 U CN 201821681384U CN 208980278 U CN208980278 U CN 208980278U
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Abstract
A kind of Multifunctional AC electri forklift hydraulic control system, including fuel tank, rear pump, multiple directional control valve, embrace folder motor, armful folder cylinder, raising cylinder, inclined cylinder, steering cylinder, rear pump is gear pump, gear pump connection motor is simultaneously driven by motor, motor is threephase asynchronous machine, motor is electrically connected frequency converter, and the oil circuit output end that frequency converter is electrically connected controller gear pump connects proportional flow control valve；Flow sensor is equipped on the oil circuit that the proportional flow control valve connects multiple directional control valve and preferential flow divider valve；The oil circuit output end of gear pump is also connected with proportional pressure control valve, and pressure sensor is equipped with before the oil circuit of the multiple directional control valve.It can be loaded according to fork truck while with high-speed response and automatically control hydraulic system output flow and pressure and load matched, and then achieved the purpose that reduce system heat generation and reduce system power dissipation.
Description
Technical field
The utility model relates to electri forklifts, and in particular to a kind of Multifunctional AC electri forklift hydraulic control system.
Background technique
Logistic industry and market and economy have it is close contact, in the epoch that economy is become increasingly prosperous, the hair of logistic industry
Exhibition seems particularly significant.Fork truck is widely used in all trades and professions as a kind of logistics handbarrow.Fork truck working environment is various each
Sample haunts about confined region, has higher requirements in narrow space region for the flexibility of fork truck and mobility.
Existing electri forklift is generally DC driven, by multiple motors respectively drive running gear, portal frame system and
Steering system, to improve energy utilization efficiency, frequently with motor-driven volumetric speed control, but since speed control system with adjustable displacement responds
Relatively slow, flow control is inaccurate, and accordingly, there exist the problems of the flexible property deficiency of fork truck, while being controlled respectively by multiple motors
It is high to manufacture into vehicle general power, cruise duration is short, and failure rate is higher, and control system is complicated.
Utility model content
In view of the above-mentioned defects in the prior art, the utility model provides a kind of Multifunctional AC electri forklift hydraulic control system
System, automatic control hydraulic system output flow and pressure and load can be loaded according to fork truck while high-speed response by having
Match, and then achievees the purpose that reduce system heat generation and reduce system power dissipation.
In order to realize the purpose of this utility model, the following technology of proposed adoption:
A kind of Multifunctional AC electri forklift hydraulic control system, the rear pump including connecting fuel tank, connect with rear pump
Multiple directional control valve and preferential flow divider valve, what is connect with multiple directional control valve embraces folder motor, embraces folder cylinder, raising cylinder, inclined cylinder, and excellent
The hydraulic steering gear of first flow divider connection, and the steering cylinder being connect with hydraulic steering gear, the multiple directional control valve, raising
The fuel tank that cylinder, hydraulic steering gear connect, it is characterised in that:
The rear pump is gear pump, and the gear pump connects motor and is driven by motor, and the motor is phase asynchronous
Motor, the motor are electrically connected frequency converter, and the frequency converter is electrically connected controller, and the motor is electrically connected controller；
The oil circuit output end of the gear pump connects proportional flow control valve, and the proportional flow control valve is electrically connected controller；
Flow sensor is equipped on the oil circuit that the proportional flow control valve connects multiple directional control valve and preferential flow divider valve, it is described
Flow sensor is electrically connected controller；
The oil circuit output end of the gear pump is also connected with proportional pressure control valve, and the other end of the proportional pressure control valve is connected to more
On oil circuit between way reversing valve and fuel tank, the proportional pressure control valve is electrically connected controller；
Pressure sensor is equipped with before the oil circuit of the multiple directional control valve, the pressure sensor is electrically connected controller.
According to above-mentioned design, the raising cylinder connects multiple directional control valve by safety valve.
According to above-mentioned design, the fuel tank passes through oil filter tooth connection wheel pump.
According to above-mentioned design, the controller is PID controller.
The utility model has the beneficial effect that
1, by controller Collaborative Control proportional pressure control valve and proportional flow valve opening, and then control system is exported to work
The pressure and flow of the hydraulic oil of cylinder reduce power consumption while realizing forklift hydraulic system high-speed response；
With use the scheme of variable-frequency control pump control there are essential distinction in the prior art, the utility model be specifically using than
Example valve controls speed, replaces pump control to realize accurate speed regulation and high-speed response using valve control；
Controlling the schemes of multiple actuators respectively using multiple solenoid valves in the prior art, there are essential distinctions, this is practical
Novel is specifically to use the multiple actuators of proportional valve control, realizes the peak efficiency of minimum cost, while overflowing using ratio
Flowing valve reduces pump discharge flow, more reduction system power；
Compared with the scheme controlled in the prior art using simple frequency control, the utility model realizes pump, valve
Joint speed regulation, has better precision and response speed.
2, using proportional flow control valve control output to the flow of each working cylinder, valve control is compared to simple pump control (frequency control)
It can be avoided the slow defect of the response speed of motor or variable pump, the high-speed response of flow control realized, to improve Forklift Worker
Response speed when making；
3, using proportional overflow valve control system highest oil pressure relief, required pressure is same before guaranteeing proportional flow control valve valve
When, pump output pressure is minimized, to reduce system overflow power consumption and Hydraulic System Fever, realizes electri forklift electric energy
It maximally utilizes；
4, multiple actuators are controlled using a proportional flow control valve, realizes that accurately adjusting the speed for each actuator working cylinder is same
When minimize system cost；
5, by PID controller, while motor speed, proportional flow valve opening, proportional overflow valve opening are controlled, and according to
The feedback of flow sensor, pressure sensor is carried out automatically controlling and is adjusted, and makes hydraulic system work in optimal work shape
State, and then achieve the purpose that reduce system heat generation and reduce system power dissipation.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model.
Fig. 2 is the utility model control mode flow chart.
Wherein, 1- fuel tank, 2- filter, 3- gear pump, 4- motor, 5- proportional pressure control valve, 6- proportional flow control valve, 7- flow
Sensor, 8- multiple directional control valve, 9- pressure sensor, 10- embrace folder motor, and 11-, which is embraced, presss from both sides cylinder, 12- raising cylinder, 13- inclined cylinder,
14- safety valve, 15- steering cylinder, 16- hydraulic steering gear, 17- frequency converter, 18- controller.
Specific embodiment
Present embodiment is illustrated with reference to the accompanying drawings of the specification:
As shown in Figure 1, a kind of Multifunctional AC electri forklift hydraulic control system, the rear pump including connecting fuel tank 1, with
The multiple directional control valve 8 and preferential flow divider valve of rear pump connection, what is connect with multiple directional control valve 8 embraces folder motor 10, embraces folder cylinder 11, rises
Rise cylinder 12, inclined cylinder 13, the hydraulic steering gear 16 connecting with preferential flow divider valve, and the steering cylinder connecting with hydraulic steering gear 16
15, the fuel tank 1 that the multiple directional control valve 8, raising cylinder 12, hydraulic steering gear 16 connect.
The rear pump is gear pump 3, and the gear pump 3 connects motor 4 and driven by motor 4, and the motor 4 is three-phase
Asynchronous machine, the motor 4 are electrically connected frequency converter 17, and the frequency converter 17 is electrically connected controller 18, and the motor 4 is electrical
Connect controller 18.
The oil circuit output end of the gear pump 3 connects proportional flow control valve 6, and the proportional flow control valve 6 is electrically connected controller
18。
Flow sensor 7 is equipped on the oil circuit that the proportional flow control valve 6 connects multiple directional control valve 8 and preferential flow divider valve,
The flow sensor 7 is electrically connected controller 18.
The oil circuit output end of the gear pump 3 is also connected with proportional pressure control valve 5, the other end connection of the proportional pressure control valve 5
On oil circuit between multiple directional control valve 8 and fuel tank 1, the proportional pressure control valve 5 is electrically connected controller 18.
Pressure sensor 9, the electrical connection of pressure sensor 9 control are equipped with before the oil circuit of the multiple directional control valve 8
Device 18.
Specifically, the raising cylinder 12 connects multiple directional control valve 8 by safety valve 14.
Specifically, the fuel tank 1 passes through 2 tooth connection wheel pump 3 of oil filter.
Specifically, the controller 18 is PID controller.
It embraces folder cylinder 11, raising cylinder 12, inclined cylinder 13 and constitutes working cylinder, each working cylinder and steering cylinder 15 are concentrated by gear pump 3
Fuel feeding, and pass through the flow of preferential flow divider valve guarantee steering cylinder 15.
Hydraulic system provides pressure oil by gear pump 3 and inputs to proportional flow control valve 6, and proportional flow control valve 6 is according to controller
The 18 valve control signals given determine aperture, so that the flow into multiple directional control valve 8 is controlled, it is each by adjusting multiple directional control valve 8
The switch of a valve, control pressure oil enter different hydraulic cylinders, realize the different movement of fork truck.
Wherein, the gear pump 3 that the threephase asynchronous machine 4 that frequency converter 17 controls drives provides pressure oil.
Wherein, proportional flow control valve 6 is used to control the flow into each working cylinder.
Wherein, proportional pressure control valve 5 is used as system safety valve, limits system maximum pressure.
Wherein, PID controller 18 is by controlling frequency converter 17, to control to 4 frequency of threephase asynchronous machine
System, and then control 4 revolving speed of motor.
Wherein, pressure sensor 9 can detecte load pressure, and feed back to control before the oil circuit of multiple directional control valve 8
Device 18 is for realizing automatic control.
It is illustrated in figure 2 the control mode flow chart of the utility model.
In specific implementation, threephase asynchronous machine 4 is frequency control, controls 4 revolving speed of motor by frequency converter 17, passes through controller
18 change 17 output frequency of frequency converter to change 4 revolving speed of motor, to control hydraulic system input flow rate；18 basis of controller
Revolving speed needed for 6 aperture of proportional flow control valve calculates motor 4 automatically makes to export pump output flow slightly larger than 6 output stream of proportional flow control valve
Amount, it is ensured that have sufficient flow supply before proportional flow control valve 6.
In specific implementation, controller 18 can according to fork truck load feedback pressure automatically control hydraulic system output pressure with
Load pressure matches, and the sum of pressure and linear loss pressure needed for loading pump discharge pressure slightly above make proportional flow control valve 6
Front and back has enough pressure differences to ensure that proportional flow control valve 6 can be adjusted the speed accurately, while minimizes system spill losses.
In specific control, controller 18 is the control voltage by changing proportional flow control valve 6, realizes proportional flow control valve 6
To change hydraulic system output flow, since flow is finally controlled by valve, the response of system can be improved in the change of aperture
Speed.Specifically, operating rate can be needed according to what user inputted, proportional flow control valve 6 is controlled using PID controller 18 and is opened
Degree, realizes the accurate control of output flow.
In specific control, flow sensor 7 is located at the outlet of proportional flow control valve 6, for supervising the stream of direction-finding system output
Amount, and signal is fed back into controller 18, it realizes closed-loop control, improves system control precision.
In specific control, controller 18 is considered simultaneously by the discharge capacity of calculating proportional flow control valve 6 aperture and gear pump 3
After leakage and diverter flow, frequency converter 17 is adjusted to control the revolving speed of motor 4, and adjust 6 aperture of proportional flow control valve, realized most
Good matching reduces excess flow and then reduces the power consumption of hydraulic system.
In specific control, pressure sensor 9 can detecte the ongoing maximum working pressure of hydraulic system, then
Controller 18 is fed back to, controller 18 controls 5 aperture of proportional pressure control valve according to operating pressure size, and then controls hydraulic system
Maximum pressure.
When the system is operating, it is first determined working flow needed for hydraulic system according to 18 flow rate calculation of controller and is opened
Proportional pressure control valve 5, while it is matching to adjust 4 revolving speed of motor, according to load regulation proportional pressure control valve 5, determines system overflow pressure
Power；Jointly control the aperture of proportional flow control valve 6, the aperture of 4 revolving speed of motor and proportional pressure control valve 5 by controller 18, it can
To control hydraulic system pressure and flow simultaneously, the pressure flow of hydraulic system and the best match of load are realized, reduce power consumption,
Battery is increased while improving response speed using valve control uses the time.
The utility model by before actuator be added a proportional velocity regulating valve, realize multiple actuators it is accurate speed regulation with
High-speed response, while flow is matched with Frequency Converter Control motor speed, pump discharge pressure and load are reduced with proportional pressure control valve
Match, reduce power, extends service time of battery.
Claims (4)
1. a kind of Multifunctional AC electri forklift hydraulic control system, the rear pump including connecting fuel tank (1), connect with rear pump
Multiple directional control valve (8) and preferential flow divider valve, connect with multiple directional control valve (8) embrace folder motor (10), embrace folder cylinder (11), raising
Cylinder (12), inclined cylinder (13), the hydraulic steering gear being connect with preferential flow divider valve (16), and connect with hydraulic steering gear (16)
Steering cylinder (15), the fuel tank (1) that the multiple directional control valve (8), raising cylinder (12), hydraulic steering gear (16) connect, feature
It is:
The rear pump is gear pump (3), and the gear pump (3) connects motor (4) and driven by motor (4), the motor (4)
For threephase asynchronous machine, the motor (4) is electrically connected frequency converter (17), and the frequency converter (17) is electrically connected controller
(18), motor (4) electrical connection controller (18)；
The oil circuit output end of the gear pump (3) connects proportional flow control valve (6), proportional flow control valve (6) the electrical connection control
Device (18)；
Flow sensor is equipped in the proportional flow control valve (6) connection multiple directional control valve (8) and the oil circuit of preferential flow divider valve
(7), flow sensor (7) electrical connection controller (18)；
The oil circuit output end of the gear pump (3) is also connected with proportional pressure control valve (5), and the other end of the proportional pressure control valve (5) connects
It connects on the oil circuit between multiple directional control valve (8) and fuel tank (1), the proportional pressure control valve (5) is electrically connected controller (18)；
Pressure sensor (9) are equipped with before the oil circuit of the multiple directional control valve (8), pressure sensor (9) the electrical connection control
Device (18) processed.
2. Multifunctional AC electri forklift hydraulic control system according to claim 1, which is characterized in that the raising cylinder
(12) pass through safety valve (14) connection multiple directional control valve (8).
3. Multifunctional AC electri forklift hydraulic control system according to claim 1, which is characterized in that the fuel tank
(1) pass through oil filter (2) tooth connection wheel pump (3).
4. Multifunctional AC electri forklift hydraulic control system according to claim 1, which is characterized in that the controller
It (18) is PID controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821681384.8U CN208980278U (en) | 2018-10-17 | 2018-10-17 | A kind of Multifunctional AC electri forklift hydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821681384.8U CN208980278U (en) | 2018-10-17 | 2018-10-17 | A kind of Multifunctional AC electri forklift hydraulic control system |
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| Publication Number | Publication Date |
|---|---|
| CN208980278U true CN208980278U (en) | 2019-06-14 |
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ID=66787823
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821681384.8U Active CN208980278U (en) | 2018-10-17 | 2018-10-17 | A kind of Multifunctional AC electri forklift hydraulic control system |
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| CN (1) | CN208980278U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278625A (en) * | 2021-12-12 | 2022-04-05 | 江苏悦达智能农业装备有限公司 | Hydraulic system of electric tractor |
| CN114321039A (en) * | 2021-12-12 | 2022-04-12 | 江苏悦达智能农业装备有限公司 | Novel electric tractor hydraulic system |
-
2018
- 2018-10-17 CN CN201821681384.8U patent/CN208980278U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278625A (en) * | 2021-12-12 | 2022-04-05 | 江苏悦达智能农业装备有限公司 | Hydraulic system of electric tractor |
| CN114321039A (en) * | 2021-12-12 | 2022-04-12 | 江苏悦达智能农业装备有限公司 | Novel electric tractor hydraulic system |
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