CN116557370A - Work platform control system and aerial work platform equipment - Google Patents

Work platform control system and aerial work platform equipment Download PDF

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Publication number
CN116557370A
CN116557370A CN202310824253.XA CN202310824253A CN116557370A CN 116557370 A CN116557370 A CN 116557370A CN 202310824253 A CN202310824253 A CN 202310824253A CN 116557370 A CN116557370 A CN 116557370A
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China
Prior art keywords
valve
oil
port
pressure
control valve
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CN202310824253.XA
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Chinese (zh)
Inventor
陈思瑶
张红飞
靳翠军
马乔乔
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XCMG Fire Fighting Safety Equipment Co Ltd
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XCMG Fire Fighting Safety Equipment Co Ltd
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Priority to CN202310824253.XA priority Critical patent/CN116557370A/en
Publication of CN116557370A publication Critical patent/CN116557370A/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • 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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The invention relates to an operation platform control system and high-altitude operation platform equipment, wherein the operation platform control system comprises a constant current source, a first executing device, a second executing device and a flow control valve, and the constant current source is configured to provide hydraulic oil with preset flow; the first executing device comprises a first executing mechanism and a first main control valve; the second executing device comprises a second executing mechanism and a second main control valve; the flow control valve is connected with the constant current source, and when the first main control valve is in a working position, the flow control valve is configured to enable the constant current source to supply oil to the first actuating mechanism under the condition that the pressure of an oil inlet path of the first actuating mechanism is smaller than the sum of the load pressure of the first actuating mechanism and the preset pressure; when the second main control valve is in the working position, the flow control valve is configured to enable the constant current source to supply oil to the second executing mechanism under the condition that the pressure of an oil inlet oil path of the first executing mechanism is larger than or equal to the sum of the load pressure of the first executing mechanism and the preset pressure or the first main control valve is in the non-working position.

Description

Work platform control system and aerial work platform equipment
Technical Field
The invention relates to the technical field of engineering machinery, in particular to an operation platform control system and high-altitude operation platform equipment.
Background
The self-walking type aerial work platform is mainly applied to the fields of building construction, steel structures, venues, shipyards, leases and the like, along with the rapid development of infrastructure construction in China, the demand and the holding quantity of the aerial work platform are rapidly increased, meanwhile, the mutual competition of the same industry and the requirement of customers on performance are higher and higher, so that the aerial work platform has the requirements of high safety, high reliability, high intelligence and high operability, wherein the high operability means the stability and the rapid response of actions.
The current platform control system of the self-walking aerial working platform generally adopts a constant pressure system or a quantitative load sensitive system. The constant pressure system has the advantages of stable action and quick response, but has larger pressure loss, and is easy to cause energy waste. The pressure of the quantitative load sensitive system can change along with the load, so that the pressure loss can be greatly reduced, but the stability of the system is reduced due to the fact that the three-way pressure compensation valve is introduced, so that the system is easy to vibrate, the pressure fluctuation of the system is caused, in order to solve the problem of action shake caused by the pressure fluctuation, an energy accumulator is usually added to a load feedback oil way to filter the pressure of the system, however, the energy accumulator needs time to charge, the system is slow to build pressure, the responsiveness of the system is reduced, and particularly the phenomenon that the starting delay is easy to appear in small-flow actions such as platform swing is extremely obvious. In view of the foregoing, there is a need for a system solution that combines smoothness and responsiveness.
It should be noted that the information disclosed in the background section of the present invention is only for increasing the understanding of the general background of the present invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides an operation platform control system and aerial operation platform equipment.
According to an aspect of the present invention, there is provided an operation platform control system including a constant current source configured to provide a preset flow of hydraulic oil, a first actuator including a first actuator and a first main control valve, a second actuator including a second actuator and a second main control valve, and a flow control valve connected to the constant current source, the flow control valve being configured to control oil supply from the constant current source to the first actuator and the second actuator; when the first main control valve is in a working position, the flow control valve is configured to enable the constant current source to supply oil to the first executing mechanism under the condition that the pressure of an oil inlet path of the first executing mechanism is smaller than the sum of the load pressure of the first executing mechanism and the preset pressure; when the second main control valve is in the working position, the flow control valve is configured to enable the constant current source to supply oil to the second executing mechanism under the condition that the pressure of an oil inlet oil path of the first executing mechanism is larger than or equal to the sum of the load pressure of the first executing mechanism and the preset pressure or the first main control valve is in the non-working position.
In some embodiments, the first master valve is configured to communicate an oil path between the flow control valve and the first actuator when in the active position and to shut off the oil path between the flow control valve and the first actuator when in the inactive position.
In some embodiments, the flow control valve includes a first pilot port at one end of the valve, and a second pilot port and a spring at the other end of the valve, the first pilot port configured to obtain a pressure of an oil inlet path of the first actuator, the second pilot port configured to obtain a load pressure of the first actuator when the first main control valve is in a working position, and the preset pressure is a pressure corresponding to a spring force of the spring of the flow control valve.
In some embodiments, the flow control valve includes a first port in communication with the constant current source, a second port in communication with the oil inlet passage of the first actuator, and a third port in communication with the oil inlet passage of the second actuator; the oil duct between the first oil port and the second oil port is a normal-open oil duct, and the flow control valve is configured to enable the oil duct between the first oil port and the third oil port to be communicated when the pressure of the first hydraulic control port is greater than the sum of the pressure of the second hydraulic control port and the pressure corresponding to the spring force of the spring.
In some embodiments, the first actuator further comprises an adjustable throttle valve disposed between the flow control valve and the first master valve, the adjustable throttle valve being configured to control the flow of hydraulic oil to the oil circuit in which it is disposed, thereby controlling the speed of the first actuator.
In some embodiments, the first actuator further includes an adjustable throttle valve disposed between the flow control valve and the first main control valve, the adjustable throttle valve configured to control a flow rate of hydraulic oil in an oil passage in which the adjustable throttle valve is disposed, thereby controlling a speed of the first actuator, and the first pilot port is configured to obtain a pressure of an oil-in oil passage of the adjustable throttle valve.
In some embodiments, the second actuator further comprises a pressure compensating valve disposed between the flow control valve and the second master valve.
In some embodiments, the work platform control system further comprises a tank, the second pilot port being configured to communicate with the tank with the first master valve in the inactive position.
In some embodiments, the work platform control system further comprises a relief valve disposed between the oil line between the second pilot port and the first pilot valve and the oil tank.
In some embodiments, the work platform control system further includes an oil tank, a regulating valve disposed between the third port of the flow control valve and the oil tank, the second pilot port being configured to communicate with the oil tank when the first main control valve is in the inactive position, the regulating valve including a third pilot port at one end of the valve and a fourth pilot port and a spring at the other end of the valve, the third pilot port being configured to obtain an outlet pressure of the third port of the flow control valve, the fourth pilot port being configured to obtain a load pressure of the second actuator, and a valve port opening of the regulating valve being configured to change as a pressure difference between both ends thereof changes.
In some embodiments, the second actuator includes a plurality of ports connected to the second master valve, and the second actuator further includes a shuttle valve connected to the plurality of ports, the shuttle valve configured to obtain a load pressure of the second actuator and feed back to the fourth pilot port.
In some embodiments, the work platform control system further comprises an accumulator, an oil port of the accumulator being in communication with the fourth hydraulic port.
In some embodiments, the work platform control system includes more than one second execution device.
According to another aspect of the present invention, there is provided aerial work platform apparatus comprising the work platform control system described above.
Based on the technical scheme, the invention provides a working platform control system which comprises a constant current source, a flow control valve, a first executing mechanism, a first main control valve corresponding to the first executing mechanism, a second executing mechanism and a second main control valve corresponding to the second executing mechanism. By arranging the flow control valve, the first main control valve and the second main control valve, the first main control valve can supply oil to the first executing mechanism preferentially when being in a working position, and the second executing mechanism is supplied with oil after the hydraulic oil requirement of the first executing mechanism is met (namely, the pressure of an oil inlet oil way of the first executing mechanism is larger than or equal to the sum of the load pressure of the first executing mechanism and the preset pressure), so that the quick response of the action of the first executing mechanism can be ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.
Fig. 1 shows a hydraulic schematic of an embodiment of the work platform control system of the present invention.
Figure 2 shows a schematic structural view of one embodiment of the aerial work platform device of the present invention.
Fig. 3 shows a hydraulic schematic of an embodiment of a related art aerial work platform control system.
In the figure: 1. a constant current source; 2. a first actuator; 3. a first main control valve; 4. a second actuator; 4-1, leveling the oil cylinder; 4-2, an amplitude-variable oil cylinder; 5. the second main control valve; 5-1, a first proportional reversing valve; 5-2, a second proportional reversing valve; 6. a flow control valve; 61. a first oil port; 62. a second oil port; 63. a third oil port;
7. an adjustable throttle valve; 8. a pressure compensating valve; 8-1, a first pressure compensating valve; 8-2, a second pressure compensating valve; 9. an oil tank; 10. an overflow valve; 11. a regulating valve; 12. a shuttle valve; 12-1, a first shuttle valve; 12-2, a second shuttle valve; 13. an accumulator; 14. a one-way valve; 14-1, a first one-way valve; 14-2, a second one-way valve; 15. a flow valve;
16. an operation platform; 17. a main arm; 18. a turntable; 19. a mounting frame; 20. a hydraulic oil source; 21. a platform swing cylinder; 22. a platform leveling cylinder; 23. crank arm amplitude-variable oil cylinder; 24. a shuttle valve; 25. a reversing valve; 26. a compensation valve; 27. a one-way valve; 28. an accumulator; 29. a three-way pressure compensating valve; 30. a flow valve; 31. and an oil tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
Referring to fig. 1, in some embodiments of the work platform control system provided by the present invention, the work platform control system includes a constant current source 1, a first actuator, a second actuator, and a flow control valve 6. The first executing device comprises a first executing mechanism 2 and a first main control valve 3, and the second executing device comprises a second executing mechanism 4 and a second main control valve 5.
The constant current source 1 is configured to provide a preset flow of hydraulic oil; the flow control valve 6 is connected with the constant current source 1, and the flow control valve 6 is used for controlling the constant current source 1 to supply oil to the first executing mechanism 2 and the second executing mechanism 4; when the first main control valve 3 is in the working position, the flow control valve 6 is configured to enable the constant current source 1 to supply oil to the first actuator 2 when the pressure of the oil inlet path of the first actuator 2 is less than the sum of the load pressure of the first actuator 2 and the preset pressure; when the second main control valve 5 is in the working position, the flow control valve 6 is configured to enable the constant current source 1 to supply oil to the second actuator 4 when the pressure of the oil inlet path of the first actuator 2 is greater than or equal to the sum of the load pressure of the first actuator 2 and the preset pressure or the first main control valve 3 is in the non-working position.
The structural form of the first main control valve 3 may have various choices, and in some embodiments, the first main control valve 3 is a three-position five-way electromagnetic valve.
As shown in fig. 1, the flow direction of the hydraulic oil flowing through the three-position five-way solenoid valve is adjustable, so that the control of the operation direction of the first actuator 2 can be realized.
The second main control valve 5 may also have various configurations, and in some embodiments, the second main control valve 5 is a proportional reversing valve.
As shown in fig. 1, the flow direction and the flow rate of the hydraulic oil through the proportional directional valve can be adjusted, so that the direction and the speed of the operation of the second actuator 4 can be controlled.
Referring to fig. 1, the first master valve 3 is configured to communicate an oil passage between the flow control valve 6 and the first actuator 2 when in the operating position, and to shut off the oil passage between the flow control valve 6 and the first actuator 2 when in the non-operating position.
Specifically, the first main control valve 3 includes a working position on the left and right sides and a non-working position in the middle as shown in fig. 1, and the first main control valve 3 can control the on-off and the direction of the oil path for supplying the oil to the first executing mechanism 2 by switching between the three positions.
When the first main control valve 3 is switched to the left or right working position, the flow control valve 6 can make the constant current source 1 supply oil to the first executing mechanism preferentially, and after the hydraulic oil requirement of the first executing mechanism 2 is met (that is, the pressure of the oil inlet oil path of the first executing mechanism 2 is greater than or equal to the sum of the load pressure and the preset pressure of the first executing mechanism 2), the second executing mechanism 4 is supplied with oil, so that the quick response of the action of the first executing mechanism 2 can be ensured.
Referring to fig. 1, in some embodiments, the flow control valve 6 includes a first pilot port a at one end of the valve, where the first pilot port a is configured to obtain the pressure of the oil inlet path of the first actuator 2, and a second pilot port b and a spring at the other end of the valve, where the second pilot port b is configured to obtain the load pressure of the first actuator 2 when the first master valve 3 is in the working position, where the preset pressure is a pressure corresponding to the spring force of the spring of the flow control valve 6.
With the above arrangement, the movement of the spool of the flow control valve 6 can be controlled by the pressure difference across the flow control valve 6.
Specifically, referring to fig. 1, in some embodiments, the flow control valve 6 includes a first oil port 61 that communicates with the constant current source 1, a second oil port 62 that communicates with the oil intake passage of the first actuator 2, and a third oil port 63 that communicates with the oil intake passage of the second actuator 4; the oil passage between the first oil port 61 and the second oil port 62 is a normal-open oil passage, and the flow control valve is configured to communicate the oil passage between the first oil port 61 and the third oil port 63 when the pressure of the first pilot port a is greater than the sum of the pressure of the second pilot port b and the pressure corresponding to the spring force of the spring.
When the first main control valve 3 is in the working position, hydraulic oil from the constant current source 1 flows to the oil inlet passage of the first actuator 2 through the oil passage between the first oil port 61 and the second oil port 62, thereby realizing oil supply to the first actuator 2. In the above-mentioned oil supplying process, the pressure of the oil inlet oil path of the first actuator 2 is gradually increased, the pressure of the first hydraulic control port a is also gradually increased, after the oil supplying requirement of the first actuator 2 is met, the pressure of the first hydraulic control port a is increased to be greater than the sum of the pressure of the second hydraulic control port b and the pressure corresponding to the spring force of the spring, so that the pressure difference at two ends of the flow control valve 6 pushes the valve core of the flow control valve 6 to move, the oil duct between the first oil port 61 and the third oil port 63 is communicated, redundant hydraulic oil is supplied to the downstream, and the constant current source 1 can supply oil to the second actuator 4.
In the above embodiment, after the oil supply requirement of the first actuator 2 is satisfied, the oil passage between the first oil port 61 and the second oil port 62, and the oil passage between the first oil port 61 and the third oil port 63 may be simultaneously in a communication state.
In some embodiments, the first actuator further comprises an adjustable throttle valve 7, wherein the adjustable throttle valve 7 is disposed between the flow control valve 6 and the first main control valve 3, and the adjustable throttle valve 7 is configured to control the flow rate of hydraulic oil in the oil path thereof, thereby controlling the speed of the first actuator 2.
In the above embodiment, the pressure of the oil inlet of the adjustable throttle valve 7 is practically equal to the pressure of the first pilot port a of the flow control valve 6, and the pressure of the oil outlet of the adjustable throttle valve 7 is practically equal to the pressure of the second pilot port b of the flow control valve 6 (i.e., the load pressure of the first actuator 2). Then, in a case where the pressure of the first pilot port a is greater than the sum of the pressure of the second pilot port b and the pressure corresponding to the spring force of the spring, referring to the direction shown in fig. 1, the spool of the flow control valve 6 moves upward so that the opening of the oil passage between the first and second oil ports 61, 62 becomes smaller, thereby increasing the pressure lost at the oil passage between the first and second oil ports 61, 62, and further decreasing the pressure at the oil inlet of the adjustable throttle valve 7, and in a case where the pressure of the first pilot port a is less than the sum of the pressure of the second pilot port b and the pressure corresponding to the spring force of the spring, referring to the direction shown in fig. 1, the spool of the flow control valve 6 moves downward so that the opening of the oil passage between the first and second oil ports 61, 62 increases, thereby decreasing the pressure lost at the oil passage between the first and second oil ports 61, 62, and further increasing the pressure at the oil inlet of the adjustable throttle valve 7.
Through the process, the pressure of the first hydraulic control port a is finally enabled to be equal to the sum of the pressure of the second hydraulic control port b and the pressure corresponding to the spring force of the spring, namely the pressure of the oil inlet of the adjustable throttle valve 7 is enabled to be equal to the sum of the pressure of the oil outlet of the adjustable throttle valve 7 and the pressure corresponding to the spring force of the spring, namely the pressure difference at two ends of the oil inlet and the oil outlet of the adjustable throttle valve 7 is enabled to be equal to the pressure corresponding to the spring force of the spring of the flow control valve 6, namely the pressure difference of the oil inlet and the oil outlet of the adjustable throttle valve 7 is enabled to be constant. That is, the pressure of the oil inlet of the adjustable throttle valve 7 is not affected by the pressure of the oil outlet of the adjustable throttle valve 7 (i.e., the load pressure of the first actuator 2), on the one hand, the stability of the oil passage between the constant current source 1 and the flow control valve 6 can be ensured not to be affected by the load variation of the first actuator 2, thereby ensuring the reliability and safety of the oil supply process, and on the other hand, the flow rate of the hydraulic oil passing through the adjustable throttle valve 7 is ensured not to be affected by the load variation of the first actuator 2, thereby ensuring the stability of the action of the first actuator 2.
In the above embodiment, by adjusting the flow resistance of the adjustable throttle valve 7, the flow rate of the hydraulic oil flowing through the adjustable throttle valve 7 can be controlled so as to satisfy the demands for speed adjustment of the first actuator 2 under different conditions.
In some embodiments, the first actuator further comprises an adjustable throttle valve 7, the adjustable throttle valve 7 being arranged between the flow control valve 6 and the first main control valve 3, the flow control valve 6 comprising a first pilot port a at one end of the valve and a second pilot port b and a spring at the other end of the valve, the first pilot port a being configured to take the pressure of the oil intake circuit of the adjustable throttle valve 7.
In the above embodiment, the adjustable throttle valve 7 is provided between the flow control valve 6 and the first main control valve 3, and the pressure of the oil intake passage of the throttle valve 7, that is, the pressure of the oil intake passage of the first actuator 2, can be adjusted.
Referring to fig. 1, in some embodiments, the second actuator further includes a pressure compensating valve 8 disposed between the flow control valve 6 and the second master valve 5.
In the above embodiment, the pressure compensating valve 8 is provided with a spring at one end and a pilot port for acquiring the load pressure of the second actuator 4, and a pilot port for acquiring the pressure of the oil feed passage of the second actuator 4 at the other end.
With the above arrangement, when the pressure of the oil feed passage of the second actuator 4 is greater than the sum of the load pressure of the second actuator 4 and the pressure corresponding to the spring force of the spring, the valve port opening of the pressure compensating valve 8 is reduced, and at this time, the pressure lost at the pressure compensating valve 8 is increased, so that the pressure of the oil feed passage of the second actuator 4 is reduced; when the pressure of the oil feed passage of the second actuator 4 is smaller than the sum of the load pressure of the second actuator 4 and the pressure corresponding to the spring force of the spring, the valve port opening of the pressure compensating valve 8 is increased, and at this time, the pressure lost at the pressure compensating valve 8 is reduced, so that the pressure of the oil feed passage of the second actuator 4 is increased. Through the above process, the pressure of the oil inlet oil path of the second actuator 4 is finally equal to the sum of the load pressure of the second actuator 4 and the pressure corresponding to the spring force of the spring, namely, the difference value between the pressure of the oil inlet oil path of the second actuator 4 and the load pressure of the second actuator 4 is equal to the pressure corresponding to the spring force of the spring, namely, the constant pressure difference of the oil inlet and the oil outlet of the second main control valve 5 is realized. Therefore, under the condition of different loads, when the opening of the valve port of the second main control valve 5 is constant, the action execution of the second executing mechanism 4 can have the same response speed, and the stability of the system is further ensured.
Referring to fig. 1, in some embodiments, the work platform control system further includes a tank 9, and the second pilot port b is configured to communicate with the tank 9 when the first master valve 3 is in the inactive position.
Under the condition that the first main control valve 3 is in a non-working position, the second hydraulic control port b is communicated with the oil tank 9, at the moment, the pressure is very small, the constant current source 1 inputs hydraulic oil to the first oil port 61 of the flow control valve 6, the hydraulic oil flows out through the second oil port 62 and flows to the first hydraulic control port a, the pressure difference at two ends of the flow control valve 6 pushes the valve core of the flow control valve to move, the valve core of the flow control valve 6 moves upwards with reference to the direction shown in fig. 1, and then the oil duct between the first oil port 61 and the third oil port 63 is communicated, so that the hydraulic oil input by the constant current source 1 can flow to the second actuating mechanism 4 through the third oil port 63 or flow to a downstream return oil way through the third oil port 63 and then flows back to the oil tank 9.
In some embodiments, the work platform control system further includes a relief valve 10 disposed between the oil path between the second pilot port b and the first master valve 3 (i.e., the load feedback oil path of the first actuator 2) and the oil tank 9.
By providing the relief valve 10, when the first control valve 3 is in the operating position, the pressure can be limited by the relief valve 10 when the load pressure of the first actuator 2 is too high.
Referring to fig. 1, in some embodiments, the work platform control system further includes an oil tank 9, a regulating valve 11 disposed between the third oil port 63 of the flow control valve 6 and the oil tank 9, the second pilot port b is configured to communicate with the oil tank 9 when the first main control valve 3 is in the inactive position, the regulating valve 11 includes a third pilot port c at one end of the valve and a fourth pilot port d and a spring at the other end of the valve, the third pilot port c is used to obtain the outlet pressure of the third oil port 63 of the flow control valve 6, the fourth pilot port d is used to obtain the load pressure of the second actuator 4, and the opening of the valve 11 changes with the change of the pressure difference between both ends thereof.
When the first main control valve 3 and the second main control valve 5 are both in the non-working position, the fourth hydraulic control port d obtains that the load pressure of the second actuating mechanism 4 is zero, the hydraulic oil input by the constant current source 1 overcomes the spring pressure of the regulating valve 11, so that the valve port of the regulating valve 11 is opened, the hydraulic oil directly flows back to the oil tank 9, and the system is in a low-pressure unloading state. When the second main control valve 5 is in the working position, the load pressure of the second actuating mechanism 4 is fed back to the fourth hydraulic control port d, the hydraulic oil input by the constant current source 1 needs to overcome the spring force of the spring of the regulating valve 11 and the thrust of the load pressure of the second actuating mechanism 4 on the valve core of the regulating valve 11, and the valve core of the regulating valve 11 moves, so that the opening of the valve port of the regulating valve 11 is reduced. Through the above-described process, the opening degree of the valve port of the regulator valve 11 can be dynamically adjusted according to the change of the load pressure of the second actuator 4, so as to maintain the inlet pressure of the regulator valve 11 higher than the load pressure of the second actuator 4 by a pressure value corresponding to the spring force of the spring.
Referring to fig. 1, in some embodiments, the second actuator 4 includes a plurality of oil ports connected to the second master valve 5, and the second actuator further includes a shuttle valve 12 connected to the plurality of oil ports, and the shuttle valve 12 is configured to obtain the load pressure of the second actuator 4 and feed back to the fourth hydraulic control port d.
In some embodiments, the second actuator further comprises a check valve 14 disposed between the shuttle valve 12 and the fourth pilot port d.
Referring to fig. 1, in some embodiments, the work platform control system further includes an accumulator 13, and an oil port of the accumulator 13 communicates with the fourth hydraulic port d.
The accumulator 13 can realize the function of filtering the load feedback pressure of the second actuator 4, can reduce the influence of the change of the load pressure on the displacement of the valve core of the regulating valve 11, prevents the system oscillation from being caused, and ensures the stability of the action execution of the second actuator 4.
In some embodiments, the work platform control system further comprises a flow valve 15 arranged on the oil line between the accumulator 13 and the oil tank 9.
Through setting up flow valve 15, then after second master control valve 5 switches to the non-working position from the working position, can release the load feedback pressure on the oil circuit between energy storage 13 and oil tank 9 through flow valve 15, make governing valve 11 open, realize the quick release of the oil feed oil circuit of second actuating mechanism 4.
In some embodiments, the flow demand for the second actuator 4 to perform an action is greater than the flow demand for the first actuator 2 to perform an action.
For example, the first actuator 2 may be a swing cylinder for performing a swing motion of the platform, and the second actuator 4 may be a leveling cylinder for leveling the platform, and the flow requirement (about 1L/min) of the swing motion is about 20% of the leveling motion.
Referring to fig. 3, in the related art, the aerial work platform control system includes a hydraulic oil source 20, an oil tank 31, an accumulator 28, a platform swing oil cylinder 21, a platform leveling oil cylinder 22, and a crank arm luffing oil cylinder 23, a compensation valve 26 and a reversing valve 25 are provided on an oil supply path of the hydraulic oil source 20 to the three oil cylinders, and a shuttle valve 24, a check valve 27, a three-way pressure compensation valve 29, and a flow valve 30 are provided on an oil return path of the three oil cylinders to the oil tank 31.
Under the condition that the flow requirements of the action execution of the platform leveling cylinder 22 and the crank amplitude cylinder 23 are larger than the flow requirements of the action execution of the platform swing cylinder 21, the priority of the flow distribution of the hydraulic oil of the three cylinders is not distinguished, when the platform leveling cylinder 22 or the crank amplitude cylinder 23 is supplied with oil, the flow of the hydraulic oil flowing to the platform leveling cylinder 22 or the crank amplitude cylinder 23 through the reversing valve 25 is larger, the hydraulic oil can quickly reach the load sensing port of the three-way pressure compensation valve 29 through the shuttle valve 24 and the one-way valve 27, meanwhile, the quick charging of the accumulator 28 is realized, the system pressure building is quick, the flow of the hydraulic oil flowing to the platform swing cylinder 21 through the reversing valve 25 is smaller when the platform swing cylinder 21 is supplied with oil, and in this case, the charging of the accumulator 28 needs longer time, which causes slow system pressure building and the starting delay of the platform swing cylinder 21.
Therefore, the invention ensures that the constant current source 1 supplies oil to the first executing mechanism 2 preferentially by arranging the flow control valve 6, and supplies oil to the second executing mechanism 4 after meeting the hydraulic oil requirement of the first executing mechanism 2, thereby ensuring the quick response of the action of the first executing mechanism 2.
In some embodiments, the work platform control system includes more than one second execution device.
The second actuating device may be one or more second actuating devices, the second actuating mechanism 4 of the second actuating device may be a swinging oil cylinder, a leveling oil cylinder, a luffing oil cylinder, a motor and the like, and the second actuating devices may be arranged according to actual requirements, and the plurality of second actuating devices may be connected in parallel, for example, in the embodiment shown in fig. 1, the work platform control system includes two second actuating devices, one second actuating device includes the leveling oil cylinder 4-1, the first shuttle valve 12-1, the first proportional reversing valve 5-1, the first pressure compensating valve 8-1 and the first check valve 14-1, and the other second actuating device includes the luffing oil cylinder 4-2, the second shuttle valve 12-2, the second proportional reversing valve 5-2, the second pressure compensating valve 8-2 and the second check valve 14-2.
The following describes a specific structure and a working procedure of an embodiment of the operation platform control system of the present invention:
referring to fig. 1, the control system for a working platform according to the present invention includes a constant current source 1, a first actuator, a second actuator, a flow control valve 6, an oil tank 9, an overflow valve 10, a regulating valve 11, an accumulator 13, and a flow valve 15, wherein the first actuator includes a first actuator 2, a first master valve 3, and an adjustable throttle valve 7, the second actuator includes a second actuator 4, a shuttle valve 12, a second master valve 5, a pressure compensating valve 8, and a check valve 14, the pressure compensating valve 8 is disposed between the flow control valve 6 and the second master valve 5, the check valve 14 is disposed between the shuttle valve 12 and the regulating valve 11, the overflow valve 10 is disposed on an oil path between a load feedback oil path of the first actuator 2 and the oil tank 9, the regulating valve 11 is disposed on an oil path between a third oil port 63 of the flow control valve 6 and the oil tank 9, and the flow valve 15 is disposed on an oil path between the accumulator 13 and the oil tank 9.
In this embodiment, the flow control valve 6 is a two-position three-way hydraulic control valve, and the flow control valve 6 is provided with a first oil port 61, a second oil port 62 and a third oil port 63, where the first oil port 61 is communicated with the constant current source 1, the second oil port 62 is communicated with the oil inlet of the adjustable throttle valve 7, and the third oil port 63 is used for connecting with the oil inlet path of the second actuator 4.
In this embodiment, the first actuating mechanism 2 is a swinging oil cylinder, the adjustable throttle valve 7 is a throttle valve with adjustable hydraulic resistance, the first main control valve 3 is a three-position five-way electromagnetic valve, the operation platform control system comprises two second actuating devices, the second actuating mechanisms 4 of the two second actuating devices are respectively a leveling oil cylinder 4-1 and a luffing oil cylinder 4-2, the second main control valve 5 is a proportional reversing valve, and the shuttle valve 12 is a shuttle valve.
In the working process of the working platform control system, the constant current source 1 inputs hydraulic oil with constant flow to the flow control valve 6, when the first main control valve 3 is not electrified and is in the middle position (namely, the non-working position), the spring cavity of the flow control valve 6 is communicated with the oil tank 9, the valve core of the flow control valve 6 can move upwards under the action of pressure difference, and the hydraulic oil flows to the downstream through the lower position of the flow control valve 6.
When the first main control valve 3 is switched to the working position when being electrified, the flow control valve 6 firstly transmits the hydraulic oil input by the constant current source 1 to the first actuating mechanism 2 through the second oil port 62 for driving the operation platform to swing, and after the flow requirement of the swing of the operation platform is met, the flow control valve 6 supplies redundant hydraulic oil to the downstream through the third oil port 63.
Taking one of the two second execution devices in this embodiment as an example, when the first proportional reversing valve 5-1 is not electrically in the neutral position (i.e. the non-working position), the "no-load pressure" information is fed back to the fourth hydraulic control port d (i.e. the load sensing port) of the regulating valve 11 through the first shuttle valve 12-1 and the first one-way valve 14-1, the hydraulic oil overcomes the spring force of the spring of the regulating valve 11, the valve core is pushed to move to the right to open the valve port of the regulating valve 11, and all the hydraulic oil supplied by the flow control valve 6 flows back to the oil tank 9 through the regulating valve 11, at this time, the system pressure is a pressure value corresponding to the spring force of the spring of the flow control valve 6 plus a pressure value corresponding to the regulating valve 11 (generally about 3 MPa), and the system is in a low-pressure unloading state.
When the second main control valve 5 of any one of the second execution devices is electrically switched to the working position, taking the leveling process of the working platform as an example, the first proportional reversing valve 5-1 is switched to the working position, leveling load pressure is fed back to the load sensing port of the regulating valve 11 through the first shuttle valve 12-1 and the first one-way valve 14-1, hydraulic oil overcomes the spring force of the spring of the regulating valve 11 and the thrust of the load pressure acting on the valve core of the regulating valve 11, the valve core is pushed to move rightwards to open the valve port of the regulating valve 11, the valve port opening of the regulating valve 11 is dynamically adjusted according to the change of the load pressure, and the inlet pressure of the regulating valve 11 is always maintained to be higher than the pressure value corresponding to the spring force of the spring by one spring.
In the embodiment, the hydraulic valve part adopts the adjustable throttle valve with the thin blade structure, and the pressure loss of the thin blade type hydraulic resistor is mainly the local pressure loss, so that the influence of the oil temperature change on the control precision is reduced, and the control performance is improved.
By way of illustration of various embodiments of the work platform control system of the present invention, it can be seen that the work platform control system of the present invention has at least the following advantages: 1. the hydraulic oil supply device has the advantages that the first executing mechanism can be supplied with oil preferentially, and the second executing mechanism is supplied with oil after the hydraulic oil requirement of the first executing mechanism is met, so that the quick response of the action of the first executing mechanism can be ensured; 2. the flow of the hydraulic oil flowing through the first main control valve is not influenced by the load change of the first executing mechanism, so that the stability of the action of the first executing mechanism is ensured, and the impact of the load change on the system is reduced; 3. the load feedback pressure of the second actuating mechanism can be filtered, the influence of the change of the load pressure on the regulating valve is reduced, and the system oscillation is prevented from being caused.
Based on the above-mentioned operation platform control system, the present invention further provides an aerial operation platform device, as shown in fig. 2, which includes the above-mentioned operation platform control system, an operation platform 16, a main arm 17, a turntable 18, a mounting frame 19, and the like, wherein the main arm 17 is connected between the turntable 18 and the operation platform 16, a leveling cylinder 4-1, a luffing cylinder 4-2, and a first actuator 2 (swing cylinder) are disposed between the main arm 17 and the operation platform 16, the mounting frame 19 is mounted on the operation platform 16, and a valve structure in the operation platform control system is mounted on the mounting frame 19.
The positive technical effects of the operation platform control system in the above embodiments are also applicable to the aerial operation platform device, and are not described herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications and equivalents of the features disclosed herein may be made to the specific embodiments of the invention or to parts of the features may be substituted without departing from the principles of the invention, and such modifications and equivalents are intended to be encompassed within the scope of the invention as claimed.

Claims (14)

1. A work platform control system, comprising:
a constant current source (1) configured to supply a preset flow of hydraulic oil;
the first executing device comprises a first executing mechanism (2) and a first main control valve (3);
the second executing device comprises a second executing mechanism (4) and a second main control valve (5); and
a flow control valve (6) connected with the constant current source (1), wherein the flow control valve (6) is used for controlling the oil supply of the constant current source (1) to the first executing mechanism (2) and the second executing mechanism (4);
when the first main control valve (3) is in a working position, the flow control valve (6) is configured to enable the constant current source (1) to supply oil to the first executing mechanism (2) under the condition that the pressure of an oil inlet oil path of the first executing mechanism (2) is smaller than the sum of the load pressure of the first executing mechanism (2) and the preset pressure;
when the second main control valve (5) is in a working position, the flow control valve (6) is configured to enable the constant current source (1) to supply oil to the second execution mechanism (4) under the condition that the pressure of an oil inlet oil path of the first execution mechanism (2) is larger than or equal to the sum of the load pressure of the first execution mechanism (2) and the preset pressure or the first main control valve (3) is in a non-working position.
2. Work platform control system according to claim 1, characterized in that the first main control valve (3) is configured to communicate an oil circuit between the flow control valve (6) and the first actuator (2) when in the working position and to shut off an oil circuit between the flow control valve (6) and the first actuator (2) when in the non-working position.
3. The work platform control system according to claim 1, wherein the flow control valve (6) comprises a first hydraulic control port (a) at one end of the valve, a second hydraulic control port (b) at the other end of the valve, and a spring, the first hydraulic control port (a) is configured to acquire the pressure of an oil inlet circuit of the first actuator (2), the second hydraulic control port (b) is configured to acquire the load pressure of the first actuator (2) when the first main control valve (3) is at the working position, and the preset pressure is the pressure corresponding to the spring force of the spring of the flow control valve (6).
4. A work platform control system according to claim 3, characterized in that the flow control valve (6) comprises a first oil port (61) communicating with the constant current source (1), a second oil port (62) communicating with an oil inlet circuit of the first actuator (2), and a third oil port (63) communicating with an oil inlet circuit of the second actuator (4);
the oil passage between the first oil port (61) and the second oil port (62) is a normal-open oil passage, and the flow control valve (6) is configured to communicate the oil passage between the first oil port (61) and the third oil port (63) when the pressure of the first hydraulic control port (a) is greater than the sum of the pressure of the second hydraulic control port (b) and the pressure corresponding to the spring force of the spring.
5. The work platform control system according to claim 1, wherein the first actuator device further comprises an adjustable throttle valve (7), the adjustable throttle valve (7) being arranged between the flow control valve (6) and the first main control valve (3), the adjustable throttle valve (7) being configured to control the hydraulic oil flow of the oil circuit in which it is located, thereby controlling the speed of the first actuator (2).
6. The work platform control system according to claim 4, wherein the first actuator further comprises an adjustable throttle valve (7), the adjustable throttle valve (7) is disposed between the flow control valve (6) and the first main control valve (3), the adjustable throttle valve (7) is configured to control the flow rate of hydraulic oil in an oil path where the adjustable throttle valve is located, and further to control the speed of the first actuator (2), and the first hydraulic control port (a) is configured to acquire the pressure of the oil inlet path of the adjustable throttle valve (7).
7. The work platform control system according to claim 1, wherein the second execution means further comprises a pressure compensation valve (8) arranged between the flow control valve (6) and the second main control valve (5).
8. A work platform control system according to claim 3, further comprising a tank (9), the second pilot operated port (b) being configured to communicate with the tank (9) with the first pilot valve (3) in the inactive position.
9. The work platform control system according to claim 8, further comprising an overflow valve (10) provided between an oil passage between the second pilot port (b) and the first pilot valve (3) and the oil tank (9).
10. The work platform control system according to claim 4, further comprising a tank (9), a regulating valve (11) arranged between a third port (63) of the flow control valve (6) and the tank (9), the second pilot port (b) being configured to communicate with the tank (9) with the first master valve (3) in the inactive position, the regulating valve (11) comprising a third pilot port (c) at one end of the valve and a fourth pilot port (d) and a spring at the other end of the valve, the third pilot port (c) being for obtaining the outlet pressure of the third port (63) of the flow control valve (6), the fourth pilot port (d) being for obtaining the load pressure of the second actuator (4), the valve port opening of the regulating valve (11) varying with the variation of the pressure difference across the valve.
11. The work platform control system according to claim 10, wherein the second actuator (4) comprises a plurality of oil ports connected to the second main control valve (5), the second actuator further comprising a shuttle valve (12) connected to the plurality of oil ports, the shuttle valve (12) being configured to obtain the load pressure of the second actuator (4) and feed back to the fourth hydraulic control port (d).
12. The work platform control system according to claim 10, further comprising an accumulator (13), an oil port of the accumulator (13) being in communication with the fourth hydraulic control port (d).
13. The work platform control system according to any one of claims 1 to 12, wherein the work platform control system comprises more than one of the second actuators.
14. An aerial work platform apparatus comprising a work platform control system as claimed in any one of claims 1 to 13.
CN202310824253.XA 2023-07-06 2023-07-06 Work platform control system and aerial work platform equipment Pending CN116557370A (en)

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Application Number Priority Date Filing Date Title
CN202310824253.XA CN116557370A (en) 2023-07-06 2023-07-06 Work platform control system and aerial work platform equipment

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102030293A (en) * 2010-12-10 2011-04-27 徐州重型机械有限公司 Elevated operation vehicle and platform leveling hydraulic system thereof
CN107061388A (en) * 2017-04-07 2017-08-18 临工集团济南重机有限公司 It is a kind of to prevent descending from shaking and turning to the lifting working platform Ye Qu mechanisms being emptied
CN109578352A (en) * 2019-01-28 2019-04-05 徐工消防安全装备有限公司 Load sensitive system and aerial work platform
KR20190094553A (en) * 2018-02-05 2019-08-14 현대건설기계 주식회사 Steering Oil Pressure System for Forklift of improving Pressure Reduction
CN113757207A (en) * 2020-06-03 2021-12-07 上海楷液流体技术有限公司 Load-sensitive scissor-fork type aerial work vehicle and hydraulic control system thereof
CN215805454U (en) * 2021-08-30 2022-02-11 徐工集团工程机械股份有限公司科技分公司 Constant-speed driving hydraulic system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102030293A (en) * 2010-12-10 2011-04-27 徐州重型机械有限公司 Elevated operation vehicle and platform leveling hydraulic system thereof
CN107061388A (en) * 2017-04-07 2017-08-18 临工集团济南重机有限公司 It is a kind of to prevent descending from shaking and turning to the lifting working platform Ye Qu mechanisms being emptied
KR20190094553A (en) * 2018-02-05 2019-08-14 현대건설기계 주식회사 Steering Oil Pressure System for Forklift of improving Pressure Reduction
CN109578352A (en) * 2019-01-28 2019-04-05 徐工消防安全装备有限公司 Load sensitive system and aerial work platform
CN113757207A (en) * 2020-06-03 2021-12-07 上海楷液流体技术有限公司 Load-sensitive scissor-fork type aerial work vehicle and hydraulic control system thereof
CN215805454U (en) * 2021-08-30 2022-02-11 徐工集团工程机械股份有限公司科技分公司 Constant-speed driving hydraulic system

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Application publication date: 20230808