CN112943722A - Multidirectional forklift hydraulic system based on hydraulic motor - Google Patents

Multidirectional forklift hydraulic system based on hydraulic motor Download PDF

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Publication number
CN112943722A
CN112943722A CN202110394929.7A CN202110394929A CN112943722A CN 112943722 A CN112943722 A CN 112943722A CN 202110394929 A CN202110394929 A CN 202110394929A CN 112943722 A CN112943722 A CN 112943722A
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CN
China
Prior art keywords
wheel
steering
bearing wheel
hydraulic
way electromagnetic
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CN202110394929.7A
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Chinese (zh)
Inventor
田松杰
宗晓兵
薛进
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Banyitong Science & Technology Developing Co ltd
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Banyitong Science & Technology Developing Co ltd
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Priority to CN202110394929.7A priority Critical patent/CN112943722A/en
Publication of CN112943722A publication Critical patent/CN112943722A/en
Pending legal-status Critical Current

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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
    • B62D5/14—Rotary motor
    • 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
    • B66F9/07568—Steering arrangements

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)

Abstract

The invention discloses a hydraulic motor-based multidirectional forklift hydraulic system, which comprises a driving wheel, a left bearing wheel, a right bearing wheel and a right bearing wheel, wherein the driving wheel is arranged in the middle of the rear part of a forklift body and is connected with a driving wheel steering motor through a first transmission device, the left bearing wheel is arranged on a left supporting leg of the forklift body and is connected with the left bearing wheel steering motor through a second transmission device, the right bearing wheel is arranged on a right supporting leg of the forklift body, and the right bearing wheel is connected with the right bearing wheel steering motor through a third transmission device. According to the invention, each running wheel is connected with the hydraulic motor, so that the direct use of oil cylinder driving is avoided, and the installation space is greatly reduced; meanwhile, the electromagnetic valve and the electromagnetic proportional valve in the hydraulic system of the whole vehicle are combined for use, so that the hydraulic system of the whole vehicle has the advantages of quick steering response, quick action and low comprehensive cost; in addition, the hydraulic motor has strong overload resistance, reduces the failure rate of the whole vehicle and is convenient to maintain.

Description

Multidirectional forklift hydraulic system based on hydraulic motor
Technical Field
The invention relates to the technical field of forklift hydraulic systems, in particular to a hydraulic motor-based multidirectional forklift hydraulic system.
Background
Fork truck is the important equipment of modern goods transportation and loading and unloading, extensively is used for storage commodity circulation field. The arrangement and design of the existing warehouse are based on the principle of saving materials and land, the goods can be stacked to the maximum extent, the utilization rate of the land in unit area is improved, and the forklift is required to complete operations such as loading, unloading, stacking and transferring in a narrower space. The multi-directional forklift generally has the functions of straight running, lateral running and in-situ rotation, so that the multi-directional forklift has better flexibility and is widely used.
However, the existing multi-directional forklift generally adopts an oil cylinder to push and steer the bearing wheel, so that on one hand, the oil cylinder occupies a larger installation space, and on the other hand, when the bearing wheel is stressed unevenly, the fault that the piston of the oil cylinder is blocked easily occurs; in addition, the oil cylinder has slower running speed and longer steering waiting time, and the steering synchronism is not easy to control due to the manufacturing difference of the oil cylinders at the two sides.
Disclosure of Invention
The invention aims to provide a hydraulic system of a multi-directional forklift based on a hydraulic motor, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a hydraulic system of a multi-directional forklift based on a hydraulic motor comprises
The driving wheel is arranged at the rear part of the vehicle body in the middle, the driving wheel is connected with a driving wheel steering motor through a first transmission device, and the driving wheel steering motor is communicated with a second two-position six-way electromagnetic valve;
the left bearing wheel is arranged on a left supporting leg of the vehicle body, the left bearing wheel is connected with a left bearing wheel steering motor through a second transmission device, and the left bearing wheel steering motor is communicated with the first two-position six-way electromagnetic valve;
the right bearing wheel is arranged on the right supporting leg of the vehicle body, the right bearing wheel is connected with a right bearing wheel steering motor through a third transmission device, and the right bearing wheel steering motor is communicated with the three-position four-way electromagnetic proportional valve;
the steering wheel is connected with a steering connecting device through a transmission shaft, the steering connecting device is connected with a hydraulic steering gear, and the hydraulic steering gear is respectively communicated with a first two-position six-way electromagnetic valve and a second two-position six-way electromagnetic valve;
the pump station motor is used for driving a gear pump to operate, the gear pump is respectively communicated with the hydraulic steering gear, the three-position four-way electromagnetic valve group and the three-position four-way electromagnetic proportional valve, and the three-position four-way electromagnetic valve group is respectively communicated with the first two-position six-way electromagnetic valve and the second two-position six-way electromagnetic valve;
the controller is arranged on the vehicle body and is electrically connected with the electrical appliance element; and
and the driving mode switching switch is arranged on the vehicle body, is electrically connected with the controller and is used for switching the driving mode.
Preferably, the driving modes include a straight mode, a side-driving mode and a pivot mode.
Preferably, when the forklift is in the straight-ahead mode, the wheels automatically return to the front and back directions, the steering oil way of the left bearing wheel and the right bearing wheel is cut off and locked, and the steering of the driving wheels is linked through a steering motor of the driving wheels of the hydraulic steering gear.
Preferably, when fork truck is in when the side-walking mode, each wheel is automatic to the level, is about orientation, and the drive wheel turns to the oil circuit and cuts off and lock, bears the weight of the rotation of wheel steering motor through hydraulic steering ware control left side, the controller is collected and is compared left side and is born the weight of the wheel angle value with right side to bear the weight of the oil supply of wheel steering motor to control right side, make right side bear the weight of the steering direction of wheel and the steering direction of left side and bear the weight of the wheel opposite, turn to the angle the same.
Preferably, when the forklift is in the pivot rotation mode, the wheels automatically rotate to a set angle, the oil way is cut off, and the steering wheel is locked.
Preferably, the driving wheel, the left bearing wheel and the right bearing wheel are respectively provided with a first angle sensor, a second angle sensor and a third angle sensor which are used for monitoring the rotation angle of each wheel in real time.
Preferably, the left carrier wheel steering motor, the driving wheel steering motor and the right carrier wheel steering motor are integrated with brakes.
Preferably, the middle position of the three-position four-way electromagnetic valve group can be in an O shape and has an overpressure protection function, and the middle position of the three-position four-way electromagnetic proportional valve can be in a Y shape.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, each running wheel is connected with the hydraulic motor, so that the direct use of oil cylinder driving is avoided, and the installation space is greatly reduced; meanwhile, the electromagnetic valve and the electromagnetic proportional valve in the hydraulic system of the whole vehicle are combined for use, so that the hydraulic system of the whole vehicle has the advantages of quick steering response, quick action and low comprehensive cost; in addition, the hydraulic motor has strong overload resistance, the failure rate of the whole vehicle is reduced, and the maintenance is more convenient; more importantly, each driving wheel is driven by a hydraulic motor, so that each driving wheel has an independent steering function, the whole vehicle has various driving modes such as straight driving, side driving, in-situ rotation and the like, and the portability and the flexibility of the whole vehicle are greatly improved when the complex working conditions are faced.
Drawings
FIG. 1 is a schematic illustration of a hydraulic system of the present invention;
FIG. 2 is a schematic view of the rotation state of each driving wheel of the forklift in the straight-ahead mode;
FIG. 3 is a schematic view of the rotation of the road wheels of the forklift of the present invention in the side-track mode;
fig. 4 is a schematic view of the rotation state of each driving wheel of the forklift in the pivot steering mode.
In the figure: 1 vehicle body, 21 driving wheels, 22 first transmission device, 31 left bearing wheel, 32 second transmission device, 33 right bearing wheel, 34 third transmission device, 41 first angle sensor, 42 second angle sensor, 43 third angle sensor, 51 steering wheel, 52 transmission shaft, 53 steering connection device, 6 controller, 7 driving mode change-over switch, 81 first angle sensor signal line, 82 second angle sensor signal line, 83 third angle sensor signal line, 84 change-over switch signal line, 85 electromagnetic valve signal line, 91 hydraulic oil tank, 92 oil suction filter, 93 high precision oil return filter, 94 pump station motor, 95 gear pump, 96 two-way electromagnetic valve, 97 hydraulic steering gear, 98 first two-way six-way electromagnetic valve, 99 second two-way six-way electromagnetic valve, 910 three-position four-way electromagnetic proportional valve, 911 three-position four-way electromagnetic valve group, 912, 95 gear pump station motor, 95 gear pump, 96 two-way electromagnetic valve, 97 hydraulic steering gear, 98 first two-position six-way electromagnetic valve, 99 second two, 913 driving wheel steering motors, 914 left carrier wheel steering motors.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution:
a hydraulic system of a multi-directional forklift based on a hydraulic motor comprises
A driving wheel 21 arranged at the middle position of the rear part of the vehicle body 1, a left bearing wheel 31 arranged at the front end of a left supporting leg, and a right bearing wheel 33 arranged at the front end of a right supporting leg, wherein the left bearing wheel 31 is connected with a left bearing wheel steering motor 912 through a second transmission device 32, the driving wheel 21 is connected with a driving wheel steering motor 913 through a first transmission device 22, the right bearing wheel 33 is connected with a right bearing wheel steering motor 914 through a third transmission device 34, and a first angle sensor 41, a second angle sensor 42 and a third angle sensor 43 are respectively arranged on the driving wheel 21, the left bearing wheel 31 and the right bearing wheel 33, so that the rotation angle of each wheel is monitored in real time to ensure the accurate control of the running of the whole vehicle;
the vehicle body 1 is provided with a running mode switch 7 which can be used for switching the running modes of a multi-directional forklift, all electronic components are connected to a controller 6 through a first angle sensor signal line 81, a second angle sensor signal line 82, a third angle sensor signal line 83, a switch signal line 84 and an electromagnetic valve signal line 85, the forklift is monitored by the controller, a steering wheel 51 is connected with a hydraulic steering gear 97 through a transmission shaft 52 and a steering connecting device 53, and the steering wheel 51 can control the hydraulic steering gear 97 to steer the forklift;
this hydraulic system is absorbed oil from hydraulic tank 91 through oil absorption filter 92 by pump station motor 94 drive gear pump 95, and gear pump 95 output pressure fluid divides three routes:
one way often opens two way solenoid valve 96 and leads to the P mouth of hydraulic pressure steering gear 97, and this hydraulic pressure steering gear 97 embeds the priority valve, and oil is preferred to be supplied oil to the steering system through A, B mouths, and surplus oil supplies the portal system through EF mouth. The port A of the hydraulic steering gear 97 is respectively connected with the ports C of the first two-position six-way electromagnetic valve 98 and the second two-position six-way electromagnetic valve 99, and the port B of the hydraulic steering gear 97 is respectively connected with the ports D of the first two-position six-way electromagnetic valve 98 and the second two-position six-way electromagnetic valve 99;
the second path leads to a port P of the three-position four-way electromagnetic valve group 911, a port a of the three-position four-way electromagnetic valve group 911 is also connected to ports C of the first two-position six-way electromagnetic valve 98 and the second two-position six-way electromagnetic valve 99, respectively, and a port B of the three-position four-way electromagnetic valve group 911 is also connected to ports D of the first two-position six-way electromagnetic valve 98 and the second two-position six-way electromagnetic valve 99, respectively. The middle position of the three-position four-way electromagnetic valve group 911 can be in an O shape and has an overvoltage protection function.
The port A and the port B of the first two-position six-way electromagnetic valve 98 are both connected with the hydraulic oil tank 91, and the port P1 and the port P2 are respectively connected with the oil inlet and the oil outlet of the left carrier wheel steering motor 912; the port a and the port B of the second two-position six-way solenoid valve 99 are also connected to the hydraulic oil tank 91, and the port P1 and the port P2 are connected to the oil inlet and outlet of the driving wheel steering motor 913, respectively; in a normal position, the port A of the first two-position six-way electromagnetic valve 98 is communicated with the port P1, the port B is communicated with the port P2, similarly, the port A of the second two-position six-way electromagnetic valve 99 is communicated with the port P1, and the port B is communicated with the port P2;
the third path leads to a P port of the three-position four-way electromagnetic proportional valve 910, an A, B port of the three-position four-way electromagnetic proportional valve 910 is respectively connected with an oil inlet and an oil outlet of a right bearing wheel steering motor 914, and the middle position can be Y-shaped;
the three-position four-way electromagnetic proportional valve 910, the three-position four-way electromagnetic valve group 911 and the T port of the hydraulic steering gear 97 are converged with the return oil of the portal frame system, filtered by the high-precision oil return filter 93 and then flow into the hydraulic oil tank 91; the leaked oil of the driving wheel steering motor 913, the left carrier wheel steering motor 912, and the right carrier wheel steering motor 914 flows back to the hydraulic oil tank 91;
the driving wheel steering motor 913, the left carrier wheel steering motor 912 and the right carrier wheel steering motor 914 are integrated with brakes, so that the motors can be ensured to be locked at the current position after oil is cut off, and the driving wheels, the left carrier wheel and the right carrier wheel are ensured to be fixed at the required positions, thereby ensuring the driving stability;
pressing down a straight-going mode switch, controlling the electromagnets SA1 and SA2 to be electrified by the controller 6, switching the valve core position of the three-position four-way electromagnetic valve group 911 by controlling the on-off of SA6 or SA7, and supplying oil to the left bearing wheel steering motor 912 to enable the left bearing wheel 31 to return to the zero position; meanwhile, the valve core position of the three-position four-way electromagnetic proportional valve 910 is switched by controlling the on-off of SA4 or SA5, oil is supplied to the right bearing wheel steering motor 914, and the right bearing wheel 33 is returned to the zero position;
at this time, SA2, SA4, and SA5 are powered off, SA3 is powered on, the valve core position of the three-position four-way electromagnetic valve group 911 is switched by controlling the on/off of SA6 or SA7, and oil is supplied to the driving wheel steering motor 913 to return the driving wheels 21 to the zero position. At this point the straight run preparation is complete.
SA1, SA2, SA4, SA5, SA6 and SA7 are powered off, SA3 is kept powered on, the hydraulic steering gear 97 is driven by operating the steering wheel 51, and oil flows into the driving wheel steering motor 913 through the second two-position six-way electromagnetic valve 99 to control the driving direction of the vehicle body;
when the lateral mode switch is pressed down, the controller 6 controls the electromagnets SA1 and SA3 to be powered on, and the valve core position of the three-position four-way electromagnetic valve group 911 is switched by controlling the on-off of SA6 or SA7 to supply oil to the driving wheel steering motor 913 so that the driving wheel 21 turns to a 90-degree position;
at this time, SA3 is powered off, SA2 is powered on, the valve core position of the three-position four-way electromagnetic valve group 911 is switched by controlling the on-off of SA6 or SA7, and oil is supplied to the left bearing wheel steering motor 912 to enable the left bearing wheel 31 to rotate to a 90-degree position. Meanwhile, the valve core position of the three-position four-way electromagnetic proportional valve 910 is switched by controlling the on-off of SA4 or SA5, oil is supplied to the right bearing wheel steering motor 914, so that the right bearing wheel 33 is turned to a 90-degree position, and the preparation work of lateral movement is completed at the moment;
SA1, SA2, SA6 and SA7 are powered off, SA3 is kept powered on, a hydraulic steering gear 97 is driven by operating a steering wheel 51, oil flows into a left bearing wheel steering motor 912 through a first two-position six-way electromagnetic valve 98 to control the driving direction of a vehicle body, the angles of a left bearing wheel 31 and a right bearing wheel 33 are monitored, a main control 6 controls the on-off and size switching of SA4 or SA5 to switch the position of a valve core of the three-position four-way electromagnetic proportional valve 910 to supply oil to a right bearing wheel steering motor 914, the right bearing wheel 33 rotates along with the left bearing wheel 31, the two are always kept in an axisymmetric relationship, and the greater the asymmetry of the two is, the greater the opening degree of the three-position four-way electromagnetic proportional valve 910 is, the smaller the asymmetry of the two is, and the smaller the opening degree of the three-;
the in-situ rotation mode switch is pressed down, the controller 6 controls the electromagnets SA1 and SA2 to be powered on, the valve core position of the three-position four-way electromagnetic valve group 911 is switched by controlling the on-off of SA6 or SA7, oil is supplied to the left bearing wheel steering motor 912 to enable the left bearing wheel 31 to rotate to a preset angle position, and meanwhile, the valve core position of the three-position four-way electromagnetic proportional valve 910 is switched by controlling the on-off of SA4 or SA5, and oil is supplied to the right bearing wheel steering motor 914 to enable the right bearing wheel 33 to reach the preset angle position.
At this time, SA2, SA4, and SA5 are de-energized, SA3 is energized, and the valve body position of the three-position four-way solenoid valve group 911 is switched by controlling the on/off of SA6 or SA7, so that oil is supplied to the drive wheel steering motor 913, and the drive wheels 21 are turned to 90 degrees. And completing the pivot rotation preparation work.
At the moment, SA1, SA2, SA3, SA4, SA5, SA6 and SA7 are powered off, the forklift is started, and the original-position rotation is started.
The normally open two-way solenoid valve 96 can control the on-off of oil supplied to the hydraulic steering gear 97, and the oil supply to the port P of the three-position four-way solenoid valve group 911 and the port P of the three-position four-way solenoid proportional valve 910 is not affected. With the SA1 energized in the ready to switch modes of straight, side and pivot, the valve spool closes and opens the oil path to the hydraulic steering gear 97, thereby avoiding the effect of a mis-operation of the steering wheel on the system in the ready to switch modes.
When the first two-position six-way electromagnetic valve 98 and the second two-position six-way electromagnetic valve 99 are in normal positions, the port P1 is connected with the oil tank 91 through the port A, and the port P2 is connected with the oil tank 91 through the port B. The driving wheel steering motor 913 and the left carrier wheel steering motor 912 are guaranteed to be in an unloaded state when stopped, thereby ensuring that the motor-integrated brake can brake effectively. The spool position is switched, port C leads to P1 and port D leads to P2, at which time pressurized oil is directed to the motor. In the straight-ahead mode, the power of SA2 is cut off, the power of SA3 is supplied, the hydraulic steering gear 97 is connected with the driving wheel steering motor 913, and the steering wheel 51 is operated to control the driving wheels 21 to steer; in the side mode, the power of SA2 is on, the power of SA3 is off, the hydraulic steering gear 97 is connected with the left bearing wheel steering motor 912, the steering wheel 51 is operated to control the left bearing wheel 31 to steer, and the two actions are independent and do not interfere with each other.
The port A of the three-position four-way electromagnetic valve group 911 is simultaneously connected to the ports C of the two-position six-way electromagnetic valve I98 and the two-position six-way electromagnetic valve II 99; the port B of the three-position four-way electromagnetic valve group 911 is connected to the ports D of the first two-position six-way electromagnetic valve 98 and the second two-position six-way electromagnetic valve 99. The preparation work of mode switching is automatically completed under the control of the controller, and the manual interference is avoided. The middle position of the three-position four-way electromagnetic valve group 911 can be in an O shape and has an overvoltage protection function. No oil is output from an A, B port of the three-position four-way electromagnetic valve group 911 in the process of straight running or side running, the control of the hydraulic steering gear 97 on a steering system is not interfered, and meanwhile, the whole system is ensured to work under the safety pressure by the overpressure protection function.
The right carrier wheel steering motor 914 is controlled by the three-position four-way electromagnetic proportional valve 910, and the oil path is not affected by other oil paths, and the middle position of the three-position four-way electromagnetic proportional valve 910 can be Y-shaped. The proportional valve ensures that the follow-up response of the right bearing wheel 33 is rapid and flexible, and the right bearing wheel steering motor 914 is in an unloading state when being stopped no matter the response time of the angle difference is consistent, thereby ensuring that the integrated brake can brake effectively.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides a multidirectional fork truck hydraulic system based on hydraulic motor which characterized in that: comprises that
The driving wheel (21) is arranged at the rear part of the vehicle body (1) in the middle, the driving wheel (21) is connected with a driving wheel steering motor (913) through a first transmission device (22), and the driving wheel steering motor (913) is communicated with a second two-position six-way electromagnetic valve (99);
the left bearing wheel (31) is arranged on a left leg of the vehicle body (1), the left bearing wheel (31) is connected with a left bearing wheel steering motor (912) through a second transmission device (32), and the left bearing wheel steering motor (912) is communicated with a first two-position six-way electromagnetic valve (98);
the right bearing wheel (33) is arranged on the right supporting leg of the vehicle body (1), the right bearing wheel (33) is connected with a right bearing wheel steering motor (914) through a third transmission device (34), and the right bearing wheel steering motor (914) is communicated with the three-position four-way electromagnetic proportional valve (910);
the steering wheel (51) is connected with a steering connecting device (53) through a transmission shaft (52), the steering connecting device (53) is connected with a hydraulic steering gear (97), and the hydraulic steering gear (97) is communicated with a first two-position six-way electromagnetic valve (98) and a second two-position six-way electromagnetic valve (99) respectively;
the pump station motor (94) is used for driving a gear pump (95) to operate, the gear pump (95) is respectively communicated with the hydraulic steering gear (97), the three-position four-way electromagnetic valve group (911) and the three-position four-way electromagnetic proportional valve (910), and the three-position four-way electromagnetic valve group (911) is respectively communicated with the first two-position six-way electromagnetic valve (98) and the second two-position six-way electromagnetic valve (99);
a controller (6) which is arranged on the vehicle body (1) and is electrically connected with the electrical appliance element; and
and the running mode switching switch (7) is arranged on the vehicle body (1), is electrically connected with the controller (6) and is used for switching the running mode.
2. The hydraulic motor based multi-directional forklift hydraulic system of claim 1, wherein: the driving modes include a straight mode, a sideways mode, and a pivot mode.
3. A hydraulic motor based multi-directional forklift hydraulic system as claimed in claim 2, wherein: when the forklift is in the straight-ahead mode, the wheels automatically return to the front and back directions, the steering oil ways of the left bearing wheel (31) and the right bearing wheel (33) are cut off and locked, and the steering motor (913) is driven by the hydraulic steering gear (97) to be linked with the driving wheel (21) to steer.
4. A hydraulic motor based multi-directional forklift hydraulic system as claimed in claim 2, wherein: when the forklift is in the lateral movement mode, the wheels automatically turn to the horizontal direction and face left and right, the steering oil circuit of the driving wheel (21) is cut off and locked, the left bearing wheel steering motor (912) is controlled to rotate through the hydraulic steering gear (97), the controller (6) collects and compares angle values of the left bearing wheel (31) and the right bearing wheel (33) on two sides, oil supply of the right bearing wheel steering motor (914) is controlled, the steering direction of the right bearing wheel (33) is opposite to the steering direction of the left bearing wheel (31), and the steering angles are the same.
5. A hydraulic motor based multi-directional forklift hydraulic system as claimed in claim 2, wherein: when the forklift is in the pivot rotation mode, each wheel automatically rotates to a set angle, an oil way is cut off, and a steering wheel (51) is locked.
6. The hydraulic motor based multi-directional forklift hydraulic system according to any one of claims 2 to 5, characterized in that: and the driving wheel (21), the left bearing wheel (31) and the right bearing wheel (33) are respectively provided with a first angle sensor (41), a second angle sensor (42) and a third angle sensor (43) which are used for monitoring the rotation angle of each wheel in real time.
7. The hydraulic motor based multi-directional forklift hydraulic system of claim 6, wherein: brakes are integrated on the left carrier wheel steering motor (912), the driving wheel steering motor (913) and the right carrier wheel steering motor (914).
8. The hydraulic motor based multi-directional forklift hydraulic system of claim 7, wherein: the middle position of the three-position four-way electromagnetic valve group (911) can be in an O shape and has an overvoltage protection function, and the middle position of the three-position four-way electromagnetic proportional valve (910) can be in a Y shape.
CN202110394929.7A 2021-04-13 2021-04-13 Multidirectional forklift hydraulic system based on hydraulic motor Pending CN112943722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110394929.7A CN112943722A (en) 2021-04-13 2021-04-13 Multidirectional forklift hydraulic system based on hydraulic motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110394929.7A CN112943722A (en) 2021-04-13 2021-04-13 Multidirectional forklift hydraulic system based on hydraulic motor

Publications (1)

Publication Number Publication Date
CN112943722A true CN112943722A (en) 2021-06-11

Family

ID=76232472

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110394929.7A Pending CN112943722A (en) 2021-04-13 2021-04-13 Multidirectional forklift hydraulic system based on hydraulic motor

Country Status (1)

Country Link
CN (1) CN112943722A (en)

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