CN113845062A - Hydraulic control system for lifting platform - Google Patents

Hydraulic control system for lifting platform Download PDF

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Publication number
CN113845062A
CN113845062A CN202110992074.8A CN202110992074A CN113845062A CN 113845062 A CN113845062 A CN 113845062A CN 202110992074 A CN202110992074 A CN 202110992074A CN 113845062 A CN113845062 A CN 113845062A
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China
Prior art keywords
valve
oil
communicated
port
hydraulic control
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CN202110992074.8A
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Chinese (zh)
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CN113845062B (en
Inventor
张三喜
鄢勇
方敏
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Wuhan Marine Machinery Plant Co Ltd
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Wuhan Marine Machinery Plant Co Ltd
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Priority to CN202110992074.8A priority Critical patent/CN113845062B/en
Publication of CN113845062A publication Critical patent/CN113845062A/en
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    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
    • B66F7/20—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by several jacks with means for maintaining the platforms horizontal during movement
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
    • 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
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • 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
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram

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

Abstract

The utility model provides a hydraulic control system for lift platform belongs to hydraulic control technical field. The hydraulic control system comprises a power output unit, a lifting unit and n execution oil cylinders, wherein the lifting unit comprises a first reversing valve, m first shunt and current collecting valves, m second shunt and current collecting valves and a backpressure valve, and m is n/2. The first oil ports of the m first flow dividing and collecting valves are communicated with the third oil port and the fourth oil port of the first reversing valve, and the first oil ports of the m second flow dividing and collecting valves are communicated with the fifth oil port of the first reversing valve and the oil inlet of the back pressure valve. The rodless cavities of the n execution oil cylinders are respectively in one-to-one correspondence with and communicated with the n second oil ports of the m first flow dividing and collecting valves, and the rod cavities of the n execution oil cylinders are respectively in one-to-one correspondence with and communicated with the n second oil ports of the m second flow dividing and collecting valves. This openly is through this hydraulic control system, directly goes up and down the platform for a plurality of hydro-cylinders keep synchronous lift, improve the stability of platform.

Description

Hydraulic control system for lifting platform
Technical Field
The disclosure belongs to the technical field of hydraulic control, and particularly relates to a hydraulic control system for a lifting platform.
Background
The lifting platform is a common engineering device and is widely applied to different fields, such as a heavy vehicle tail box erecting device, an ocean engineering lifting platform and the like. In some special working condition fields, the platform is required to be lifted along the vertical direction, and the platform is always kept in a horizontal state.
In the related art, when such a lifting platform is lifted, high-strength limiting structures are generally arranged in four corners of the bottom of the lifting platform in advance. Every limit structure includes that three is parallel to each other and collinear pillar not, and the movably and perpendicular cover of lift platform is on the pillar, and laminates each other between the outer wall of pillar and lift platform's the inner wall. Then the lifting platform is driven by the oil cylinder to lift. If one of the oil cylinders moves faster, at the moment, the lifting platform is clamped by the support column and does not move until other oil cylinders synchronously follow up, so that synchronous extension and retraction of the oil cylinders can be realized.
However, the above method requires a position-limiting structure to be arranged on the lifting platform in advance, which is too high in cost and inconvenient to operate, and may affect the normal use of the lifting platform.
Disclosure of Invention
The embodiment of the disclosure provides a hydraulic control system for lifting a platform, which can directly lift the platform, so that a plurality of oil cylinders keep synchronous lifting, and the stability of the platform is improved. The technical scheme is as follows:
the embodiment of the disclosure provides a hydraulic control system for a lifting platform, which comprises a power output unit, a lifting unit and n execution oil cylinders, wherein n is more than or equal to 4 and is an even number;
the lifting unit comprises a first reversing valve, m first shunt and current collecting valves, m second shunt and current collecting valves and a backpressure valve, wherein m is n/2;
a first oil port of the first reversing valve is communicated with an oil outlet of the power output unit, and a second oil port of the first reversing valve is communicated with an oil inlet of the power output unit;
the first oil ports of the m first flow dividing and collecting valves are communicated with the third oil port and the fourth oil port of the first reversing valve, and the first oil ports of the m second flow dividing and collecting valves are communicated with the fifth oil port of the first reversing valve and the oil inlet of the back pressure valve;
an oil outlet of the back pressure valve is communicated with an oil inlet of the power output unit, and a spring cavity of the back pressure valve is communicated with a sixth oil port of the first reversing valve;
n the rodless chamber of execution hydro-cylinder respectively with m n second hydraulic fluid port one-to-one and intercommunication of first reposition of redundant personnel current-collecting valve, n the pole chamber of execution hydro-cylinder respectively with m n second hydraulic fluid port one-to-one and intercommunication of second reposition of redundant personnel current-collecting valve to make n the rodless chamber of execution hydro-cylinder and the pole chamber are head and tail intercommunication in proper order, and on the head and tail intercommunication direction in proper order, adjacent two have between the execution hydro-cylinder first reposition of redundant personnel current-collecting valve or any among the second reposition of redundant personnel current-collecting valve, first reposition of redundant personnel current-collecting valve with the second reposition of redundant personnel current-collecting valve arranges in turn in proper order.
In yet another implementation of the present disclosure, the lifting unit further comprises a hydraulically controlled check valve;
the first oil port of the hydraulic control one-way valve is communicated with the fourth oil port of the first reversing valve, the second oil port of the hydraulic control one-way valve is respectively communicated with the first oil port of each first shunting and collecting valve, and the control oil port of the hydraulic control one-way valve is respectively communicated with the spring cavity of the back pressure valve and the sixth oil port of the first reversing valve.
In yet another implementation of the present disclosure, the lifting unit further comprises a first one-way valve,
an oil inlet of the first one-way valve is communicated with a third oil port of the first reversing valve, and oil outlets of the first one-way valve are respectively communicated with first oil ports of the first shunting and collecting valves.
In yet another implementation of the present disclosure, the lifting unit further comprises a second one-way valve,
an oil inlet of the second one-way valve is communicated with an oil outlet of the power output unit, and an oil outlet of the second one-way valve is communicated with a first oil port of the first reversing valve.
In yet another implementation of the present disclosure, the hydraulic control system further includes a pressure control unit;
the pressure control unit comprises an overflow valve, an oil inlet of the overflow valve is communicated with a remote control pressure port of the power output unit, an oil outlet of the overflow valve is communicated with an oil inlet of the power output unit, and a control oil port of the overflow valve is communicated with the oil inlet of the overflow valve.
In yet another implementation of the present disclosure, the pressure control unit further includes a second directional valve;
and a first oil port of the second reversing valve is communicated with a remote control pressure port of the power output unit, a second oil port of the second reversing valve is communicated with an oil inlet of the power output unit, and a third oil port of the second reversing valve is communicated with an oil outlet of the overflow valve.
In yet another implementation of the present disclosure, the relief valve is an electromagnetic proportional relief valve.
In yet another implementation of the present disclosure, the hydraulic control system further includes a controller electrically connected to the first directional control valve, the second directional control valve, and the relief valve.
In yet another implementation of the present disclosure, the power take-off unit includes an electric motor and a main pump, an oil tank;
the motor is used for driving the main pump, an oil inlet of the main pump is communicated with the oil tank, and an oil outlet of the main pump is communicated with a first oil port of the first reversing valve.
In yet another implementation of the present disclosure, the power take-off unit further includes a filter;
the oil inlet of the filter is communicated with the oil tank, and the oil outlet of the filter is communicated with the oil inlet of the main pump.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the hydraulic control system provided by the embodiment of the disclosure is used for lifting the platform, a plurality of execution oil cylinders are uniformly arranged at the bottom of the platform to be lifted at intervals to avoid the platform to be lifted from toppling. Then, the power output unit is started, so that the hydraulic oil output by the power output unit enters the first reversing valve.
When the platform needs to ascend, at the moment, the first reversing valve is controlled, the left electromagnet is powered on, after the valve core of the first reversing valve moves rightwards, the valve core is located at the left position, the first oil port inside the first reversing valve is communicated with the fourth oil port and the sixth oil port, the third oil port of the first reversing valve is communicated with the fifth oil port, and therefore hydraulic oil flows to the fourth oil port from the first oil port of the first reversing valve and then enters the first oil port of the first shunting and collecting valve and enters the rodless cavities of the corresponding execution oil cylinders through the second oil ports of the first shunting and collecting valves. Correspondingly, hydraulic oil in a rod cavity in the execution oil cylinder enters a second oil port in the corresponding second flow dividing and collecting valve. At the moment, the spring cavity of the back pressure valve is communicated with the sixth oil port of the first reversing valve under pressure, so that the back pressure valve is closed, hydraulic oil in the rod cavity of the execution oil cylinder can only flow back to the fifth oil port of the first reversing valve through the first oil port in the second flow dividing and collecting valve, and then enters the rodless cavity of the execution oil cylinder through the third oil port of the first reversing valve, so that the power output unit can output higher pressure and a small amount of hydraulic oil to lift the platform to a preset height, and the platform can be ensured to stably lift.
When the platform needs to descend, at the moment, the first reversing valve is controlled, the electromagnet on the right side is electrified, the valve core of the first reversing valve is located at the right position after moving leftwards, the first oil port and the sixth oil port in the first reversing valve are communicated, and the fourth oil port and the fifth oil port of the first reversing valve are communicated. The platform makes the piston rod of the execution oil cylinder retract by means of self gravity, hydraulic oil flowing out of a rodless cavity of the execution oil cylinder flows to the fourth oil port and the fifth oil port of the first reversing valve through the first flow dividing and collecting valves and enters an oil inlet of the back pressure valve, so that the back pressure valve is opened, a part of hydraulic oil flows back to the power output unit through the oil outlet of the back pressure valve, the other part of hydraulic oil flows back to the second flow dividing and collecting valve through the second oil port of the second flow dividing and collecting valve and returns to a rod cavity of the execution oil cylinder again, and therefore the platform stably descends.
And the rodless cavities of the n execution oil cylinders are respectively in one-to-one correspondence and communication with the n second oil ports of the m first flow dividing and collecting valves, and the rod cavities of the n execution oil cylinders are respectively in one-to-one correspondence and communication with the n second oil ports of the m second flow dividing and collecting valves, so that two execution oil cylinders corresponding to the first flow dividing and collecting valves are not identical to two execution oil cylinders corresponding to the second flow dividing and collecting valves. Because the first collecting valve can enable the pressure entering the rodless cavities of the corresponding execution oil cylinders to be the same, and the second collecting valve can enable the pressure in the rod cavities of the corresponding execution oil cylinders to be the same, the hydraulic pressure difference entering and exiting each execution oil cylinder can be the same, and therefore each execution oil cylinder can move synchronously, the working efficiency is improved, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a hydraulic control system for lifting a platform provided by an embodiment of the present disclosure;
fig. 2 is a schematic connection diagram of an execution oil cylinder, a first flow dividing and collecting valve and a second flow dividing and collecting valve provided by the embodiment of the disclosure.
The symbols in the drawings represent the following meanings:
1. a power output unit; 11. an electric motor; 12. a main pump; 13. an oil tank; 14. a filter;
2. a lifting unit; 21. a first direction changing valve; 22. a first flow splitting and collecting valve; 23. a second flow dividing and collecting valve; 24. a back pressure valve; 25. a hydraulic control check valve; 26. a first check valve; 27. a second one-way valve;
3. an execution oil cylinder;
4. a pressure control unit; 41. an overflow valve; 42. and a second direction changing valve.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The embodiment of the disclosure provides a hydraulic control system for a lifting platform, and as shown in fig. 1, the hydraulic control system comprises a power output unit 1, a lifting unit 2 and n execution oil cylinders 3, wherein n is greater than or equal to 4, and n is an even number. The lifting unit 2 comprises a first reversing valve 21, m first shunt and current collecting valves 22, m second shunt and current collecting valves 23 and a backpressure valve 24, m being n/2. The first oil port a of the first reversing valve 21 is communicated with an oil outlet of the power output unit 1, and the second oil port b of the first reversing valve 21 is communicated with an oil inlet of the power output unit 1.
The first ports a of the m first flow-dividing and collecting valves 22 are all communicated with the third port c and the fourth port d of the first direction valve 21, and the first ports a of the m second flow-dividing and collecting valves 23 are all communicated with the fifth port e of the first direction valve 21 and the oil inlet a of the back pressure valve 24. An oil outlet b of the back pressure valve 24 is communicated with an oil inlet of the power output unit 1, and a spring cavity c of the back pressure valve 24 is communicated with a sixth oil port f of the first reversing valve 21.
Fig. 2 is a schematic connection diagram of the execution oil cylinders, the first flow splitting and collecting valve and the second flow splitting and collecting valve provided in the embodiment of the present disclosure, and with reference to fig. 2, the rodless cavities of n execution oil cylinders 3 are respectively in one-to-one correspondence and communication with the n second oil ports b of the m first flow splitting and collecting valves 22, and the rod cavities of n execution oil cylinders 3 are respectively in one-to-one correspondence and communication with the n second oil ports b of the m second flow splitting and collecting valves 23, so that the rodless cavities and the rod cavities of n execution oil cylinders 3 are sequentially communicated end to end, and in the sequential end to end communication direction, any one of the first flow splitting and collecting valve 22 or the second flow splitting and collecting valve 23 is provided between two adjacent execution oil cylinders 3, and the first flow splitting and collecting valve 22 and the second flow collecting valve 23 are sequentially and alternately arranged.
In this embodiment, the first flow-dividing and collecting valve 22 and the second flow-dividing and collecting valve 23 have the same structure, the first flow-dividing and collecting valve 22 has two second oil ports b, and the second flow-dividing and collecting valve 23 has two second oil ports b.
When the hydraulic control system provided by the embodiment of the disclosure is used for lifting the platform, the plurality of execution oil cylinders 3 are uniformly arranged at the bottom of the platform to be lifted at intervals to avoid the platform to be lifted from toppling. Then, the power output unit 1 is started so that the hydraulic oil output from the power output unit 1 enters the first direction switching valve 21.
When the platform needs to ascend, at this time, the first reversing valve 21 is controlled to enable the electromagnet on the left side to be powered on, after the spool of the first reversing valve 21 moves to the right, the spool is located at the left position, the first oil port a inside the first reversing valve 21 is communicated with the fourth oil port d and the sixth oil port f, the third oil port c of the first reversing valve 21 is communicated with the fifth oil port e, and thus hydraulic oil flows to the fourth oil port d from the first oil port a of the first reversing valve 21 and then enters the first oil port a of the first flow-splitting and collecting valve 22, and enters the rodless cavities of the corresponding execution cylinders 3 through the second oil ports b of the first flow-splitting and collecting valves 22. Correspondingly, the hydraulic oil in the rod cavity of the actuating cylinder 3 enters the second oil port b of the corresponding second flow dividing and collecting valve 23. At this time, since the spring cavity c of the back pressure valve 24 is communicated with the sixth oil port f (under pressure) of the first directional control valve 21, the back pressure valve 24 is closed, and the hydraulic oil in the rod cavity of the actuating cylinder 3 can only flow back to the fifth oil port e of the first directional control valve 21 through the first oil port a of the second flow distribution and collection valve 23, and then enters the rodless cavity of the actuating cylinder 3 through the third oil port c of the first directional control valve 21, so that the power output unit 1 can raise the platform to a predetermined height by outputting higher pressure and a small amount of hydraulic oil, and the platform is ensured to be raised stably.
When the platform needs to descend, at this moment, the first reversing valve 21 is controlled, so that the electromagnet on the right side is electrified, after the valve core of the first reversing valve 21 moves leftwards, the valve core is located at the right position, the first oil port a in the first reversing valve 21 is communicated with the sixth oil port f, and the fourth oil port d of the first reversing valve 21 is communicated with the fifth oil port e. The platform makes the piston rod of the execution cylinder 3 retract by means of the self gravity, the hydraulic oil flowing out of the rodless cavity of the execution cylinder 3 flows to the fourth oil port d and the fifth oil port e of the first reversing valve 21 through the first flow dividing and collecting valve 22, enters the oil inlet a of the back pressure valve 24, so that the back pressure valve 24 is opened, a part of the hydraulic oil flows back to the power output unit 1 through the oil outlet b of the back pressure valve 24, and the other part of the hydraulic oil flows back to the second flow dividing and collecting valve 23 through the second oil port b of the second flow dividing and collecting valve 23 and returns to the rod cavity of the execution cylinder 3 again, thereby realizing the stable descending of the platform.
Moreover, the rodless cavities of the n execution cylinders 3 are respectively in one-to-one correspondence and communication with the n second oil ports b of the m first flow-splitting and collecting valves 22, and the rod cavities of the n execution cylinders 3 are respectively in one-to-one correspondence and communication with the n second oil ports b of the m second flow-splitting and collecting valves 23, so that the two execution cylinders 3 corresponding to the first flow-splitting and collecting valves 22 are not identical to the two execution cylinders 3 corresponding to the second flow-splitting and collecting valves 23. Because the first combining valve 22 can make the pressure entering the rodless cavities of the corresponding execution cylinders 3 the same, and the second combining valve 23 can make the pressure in the rod cavities of the corresponding execution cylinders 3 the same, the hydraulic pressure difference entering and exiting each execution cylinder 3 can be the same, and further, the synchronous movement of each execution cylinder 3 can be ensured, the working efficiency is improved, and the cost is reduced.
Referring again to fig. 1, in the present embodiment, the first direction valve 21 is a three-position six-way electromagnetic direction valve.
In this embodiment, the diameter of the actuating cylinder 3 is generally large, so that a large load can be supported for lifting movement.
When a heavy platform is supported, 4 execution oil cylinders 3 are generally selected, and the 4 execution oil cylinders 3 are respectively and symmetrically arranged at four corner positions of the platform.
In this embodiment, 4 actuating cylinders 3 are selected to lift the platform, and correspondingly, the number of the first flow dividing and collecting valves 22 is 2, and the number of the second flow dividing and collecting valves 23 is 2.
Wherein, the actuating cylinders 3 corresponding to the first shunt and current collecting valve 22 are the first and the second, and the actuating cylinders 3 corresponding to the second first shunt and current collecting valve 22 are the third and the fourth. The actuating cylinders 3 corresponding to the first second shunt and current collecting valve 23 are the second and the third, and the actuating cylinders 3 corresponding to the second first shunt and current collecting valve 22 are the first and the fourth. Thus, the flow in the rodless cavities of the first execution cylinder 3 and the second execution cylinder 3 can be controlled to be consistent through the first diversion and collection valve 22, and the flow in the rodless cavities of the third execution cylinder 3 and the fourth execution cylinder 3 can be controlled to be consistent through the second first diversion and collection valve 22. Meanwhile, the flow of the oil output by the rod cavities of the second execution oil cylinder 3 and the third execution oil cylinder 3 is controlled to be consistent through the first and second flow dividing and collecting valves 23, and the flow of the oil output by the rod cavities of the first execution oil cylinder 3 and the fourth execution oil cylinder 3 is controlled to be consistent through the second and second flow dividing and collecting valves 23. By the method, the flow rates of the inlet and the outlet of the 4 execution oil cylinders 3 are controlled to be the same, so that the movement synchronism of the four execution oil cylinders 3 is ensured.
With continued reference to fig. 1, the power take-off unit 1 optionally comprises an electric motor 11 and a main pump 12, an oil tank 13. The electric motor 11 is used for driving a main pump 12, and an oil inlet of the main pump 12 is communicated with an oil tank 13. An oil outlet of the main pump 12 communicates with a first port a of the first direction valve 21.
In the above implementation, the electric motor 11 is used to drive the main pump 12 for rotation. The oil tank 13 is used for supplying power hydraulic oil for the whole hydraulic control system. The main pump 12 is used for pumping power hydraulic oil for the hydraulic control system, so that the execution oil cylinder 3 can be filled with hydraulic oil, and finally the platform can be stably lifted under the driving of the hydraulic control system.
Illustratively, the main pump 12 is a variable displacement pump.
Set up main pump 12 into the variable pump, can make main pump 12 under the invariable condition of rotational speed, the flow of output regulates and control, and the rotational speed of main pump 12 is selected the back promptly, and the output flow that corresponds also can change for the output flow of main pump 12 can change according to hydraulic control system's actual demand, and then ensures that the platform can remain stable when going up and down.
Optionally, the power output unit further includes a filter 14, the filter 14 is disposed between the oil tank 13 and the main pump 12, an oil inlet of the filter 14 is communicated with the oil tank 13, and an oil outlet of the filter 14 is communicated with an oil inlet of the main pump 12.
In the above implementation manner, the addition of the filter 14 can improve the use safety of the hydraulic control system, and prevent impurities from entering the main pump 12, and then enter the whole oil path under the driving of the main pump 12, thereby affecting the use of each valve member, and simultaneously avoiding affecting the normal use of the actuating cylinder 3.
In this embodiment, in order to enable the hydraulic oil in the oil tank 13 to meet the temperature requirement of actual use, a thermometer is usually disposed on the sidewall of the oil tank 13, so that whether the temperature in the oil tank 13 meets the actual requirement can be observed in real time through the thermometer.
For the same reason, in order to ensure that the oil in the oil tank 13 can meet the actual use requirement, a liquid level meter is usually arranged on the side wall of the oil tank 13, so that the depth of the hydraulic oil in the oil tank 13 can be observed in real time through the liquid level meter, and the volume of the hydraulic oil in the oil tank 13 is determined.
Optionally, the lifting unit 2 further comprises a pilot operated check valve 25. The first port a of the pilot operated check valve 25 is communicated with the fourth port d of the first direction valve 21, the second port b of the pilot operated check valve 25 is respectively communicated with the first ports a of the first flow-dividing/collecting valves 22, and the control port c of the pilot operated check valve 25 is respectively communicated with the spring chamber c of the back pressure valve 24 and the sixth port f of the first direction valve 21.
In the implementation manner, the hydraulic control one-way valve 25 is arranged to enable the oil path between the first reversing valve 21 and the first shunting and collecting valve 22 to flow only in one direction when the platform is lifted and the spool of the first reversing valve 21 is located at the left position, so that the normal flow of the hydraulic oil is ensured. When the platform descends, the hydraulic control one-way valve 25 can be controlled to ensure that hydraulic oil can only flow from the first diversion and collection valve 22 to the first reversing valve 21, and finally the normal use of the whole hydraulic control system is ensured.
Optionally, the lifting unit 2 further includes a first check valve 26, an oil inlet of the first check valve 26 is communicated with the third oil port c of the first directional valve 21, and oil outlets of the first check valve 26 are respectively communicated with the first oil ports a of the plurality of first flow-splitting/collecting valves 22.
In the above implementation, the first check valve 26 is used to limit the flow direction of the oil path between the first direction valve 21 and the first flow-splitting/collecting valve 22, that is, through setting the first check valve 26, the hydraulic oil flowing out from the third port c of the first direction valve 21 can only be input to the first port a of the first flow-splitting/collecting valve 22 in one direction, but cannot flow in the reverse direction, so as to improve the safety of the hydraulic control system.
Optionally, the lifting unit 2 further includes a second check valve 27, an oil inlet of the second check valve 27 is communicated with an oil outlet of the power output unit 1, and an oil outlet of the second check valve 27 is communicated with the first oil port a of the first direction valve 21.
In the above implementation, the second check valve 27 is used to limit the flow direction of the oil path between the oil outlet of the power output unit 1 and the first oil port a of the first directional valve 21, that is, through setting of the second check valve 27, the hydraulic oil flowing out of the oil outlet of the power output unit 1 can only be input to the first oil port a of the first directional valve 21 in a single direction, but cannot flow in the reverse direction, so as to improve the safety of the hydraulic control system.
Optionally, the pressure control unit 4 includes an overflow valve 41, an oil inlet a of the overflow valve 41 is communicated with the remote control pressure port of the power output unit 1, an oil outlet b of the overflow valve 41 is communicated with the oil inlet of the power output unit 1, and a control oil port c of the overflow valve 41 is communicated with the oil inlet a of the overflow valve 41.
In the above implementation, the pressure control unit 4 is used to control the pressure of the entire hydraulic control system. Since the oil inlet a of the relief valve 41 is communicated with the remote control pressure port of the power output unit 1 and the control oil port c of the relief valve 41 is communicated with the oil inlet a of the relief valve 41, when the pressure at the oil inlet in the relief valve 41 is lower than the pressure in the spring chamber of the relief valve 41, the relief valve 41 is not opened. When the pressure at the oil inlet in the relief valve 41 is higher than the pressure in the spring chamber of the relief valve 41, the relief valve 41 is opened, so that the pressure at the remote control pressure port of the power output unit 1 can be controlled by changing the relief valve 41, and the output pressure of the power output unit 1 can be adjusted.
Alternatively, the relief valve 41 is an electromagnetic proportional relief valve.
In the above implementation, the relief valve 41 is an electromagnetic electric proportional relief valve, and the pressure of the relief valve 41 can be automatically adjusted by adjusting the size of the inlet of the relief valve 41, so as to adjust the output pressure of the power output unit 1.
Optionally, the pressure control unit 4 further comprises a second directional valve 42. A first oil port a of the second reversing valve 42 is communicated with a remote control pressure port of the power output unit 1, a second oil port b of the second reversing valve 42 is communicated with an oil inlet of the power output unit 1, and a third oil port c of the second reversing valve 42 is communicated with an oil outlet b of the overflow valve 41.
In the above implementation, the second direction switching valve 42 is used in cooperation with the relief valve 41 so as to be able to adjust the output pressure of the power output unit 1.
When the power output unit 1 is used, when the power output unit 1 inputs hydraulic oil to the first reversing valve 21, the power output unit 1 can be unloaded when the electromagnet on the left side of the second reversing valve 42 is controlled to be powered off.
When the electromagnet on the left side of the second reversing valve 42 is electrified, the power output unit 1 is loaded in a no-load mode, the working pressure of the hydraulic control system is controlled through the overflow valve 41, and the working pressure acts on the remote control pressure port of the power output unit 1.
In this embodiment, the second direction valve 42 is a two-position four-way electromagnetic direction valve.
Optionally, the hydraulic control system further comprises a controller, and the controller is electrically connected with the first direction valve 21, the second direction valve 42, the overflow valve 41, and the like.
In the above embodiment, the controller can automatically control the operating states of the first direction valve 21, the second direction valve 42, the relief valve 41, and the like, thereby improving the operating efficiency.
The lifting process of the hydraulic control system provided by the embodiment of the disclosure to the platform is briefly introduced as follows:
firstly, a plurality of execution oil cylinders 3 are evenly arranged at the bottom of a platform to be lifted at intervals.
Then, the electric motor 11 is started so that the electric motor 11 drives the main pump 12 to output the hydraulic oil in the oil tank 13 into the first direction switching valve 21.
When the platform needs to ascend, at this time, the first reversing valve 21 is controlled to enable the electromagnet on the left side to be electrified, the valve core of the first reversing valve 21 is located at the left position, the first oil port a inside the first reversing valve 21 is communicated with the fourth oil port d and the sixth oil port f, the third oil port c of the first reversing valve 21 is communicated with the fifth oil port e, and therefore hydraulic oil flows from the first oil port a of the first reversing valve 21 to the fourth oil port d and then enters the first oil port a of the first flow dividing and collecting valve 22 and then enters the rodless cavities of the corresponding execution oil cylinders 3 through the second oil ports b of the first flow dividing and collecting valves 22. Correspondingly, the hydraulic oil in the rod cavity of the actuating cylinder 3 enters the second oil port b of the corresponding second flow dividing and collecting valve 23. At this time, since the spring cavity c of the back pressure valve 24 is communicated with the sixth oil port f of the first directional control valve 21, the back pressure valve 24 is closed at this time, the hydraulic oil in the rod cavity of the actuating cylinder 3 can only flow back to the fifth oil port e of the first directional control valve 21 through the first oil port a of the second flow distribution and collection valve 23, and then enters the rodless cavity of the actuating cylinder 3 through the third oil port c of the first directional control valve 21, so that the power output unit 1 can raise the platform to a predetermined height by outputting a high pressure and a small amount of hydraulic oil, and the platform is ensured to be raised stably.
When the platform needs to descend, at this time, the first reversing valve 21 is controlled to enable the right electromagnet to be powered on, the valve core of the first reversing valve 21 is located at the right position, the platform enables the piston rod of the execution oil cylinder 3 to retract by means of the gravity of the platform, hydraulic oil flowing out of the rodless cavity of the execution oil cylinder 3 flows to the fourth oil port d and the fifth oil port e of the first reversing valve 21 through the first flow dividing and collecting valve 22 and enters the oil inlet a of the back pressure valve 24, the back pressure valve 24 is opened, a part of hydraulic oil flows back to the power output unit 1 through the oil outlet of the back pressure valve 24, the other part of hydraulic oil flows back to the second flow dividing and collecting valve 23 through the second oil port b of the first reversing valve 21 and returns to the rod cavity of the execution oil cylinder 3 again, and accordingly stable descending of the platform is achieved.
The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims (10)

1. A hydraulic control system for a lifting platform is characterized by comprising a power output unit (1), a lifting unit (2) and n execution oil cylinders (3), wherein n is more than or equal to 4 and is an even number;
the lifting unit (2) comprises a first reversing valve (21), m first shunt and current collecting valves (22), m second shunt and current collecting valves (23) and a backpressure valve (24), and m is n/2;
a first oil port (a) of the first reversing valve (21) is communicated with an oil outlet of the power output unit (1), and a second oil port (b) of the first reversing valve (21) is communicated with an oil inlet of the power output unit (1);
first oil ports (a) of the m first flow dividing and collecting valves (22) are communicated with a third oil port (c) and a fourth oil port (d) of the first reversing valve (21), and first oil ports (a) of the m second flow dividing and collecting valves (23) are communicated with a fifth oil port (e) of the first reversing valve (21) and an oil inlet (a) of the back pressure valve (24);
an oil outlet (b) of the back pressure valve (24) is communicated with an oil inlet of the power output unit (1), and a spring cavity (c) of the back pressure valve (24) is communicated with a sixth oil port (f) of the first reversing valve (21);
n the rodless chamber of execution hydro-cylinder (3) respectively with m n second hydraulic fluid port (b) one-to-one and intercommunication of first reposition of redundant personnel collection valve (22), n the pole chamber of execution hydro-cylinder (3) respectively with m n second hydraulic fluid port (b) one-to-one and intercommunication of second reposition of redundant personnel collection valve (23), so that n the rodless chamber of execution hydro-cylinder (3) and the pole chamber communicate end to end in proper order, and on the direction of end to end communication in proper order, adjacent two have between execution hydro-cylinder (3) first reposition of redundant personnel collection valve (22) or any in second reposition of redundant personnel collection valve (23), first reposition of redundant personnel collection valve (22) with second reposition of redundant personnel collection valve (23) are arranged in turn in proper order.
2. The hydraulic control system of claim 1, wherein the lifting unit (2) further comprises a pilot operated check valve (25);
the first oil port (a) of the hydraulic control check valve (25) is communicated with the fourth oil port (d) of the first reversing valve (21), the second oil port (b) of the hydraulic control check valve (25) is respectively communicated with the first oil ports (a) of the first flow dividing and collecting valves (22), and the control oil port (c) of the hydraulic control check valve (25) is respectively communicated with the spring cavity (c) of the back pressure valve (24) and the sixth oil port (f) of the first reversing valve (21).
3. The hydraulic control system of claim 1, wherein the lifting unit (2) further comprises a first one-way valve (26),
an oil inlet of the first check valve (26) is communicated with a third oil port (c) of the first reversing valve (21), and an oil outlet of the first check valve (26) is respectively communicated with first oil ports (a) of the first shunting and collecting valves (22).
4. Hydraulic control system according to claim 1, characterized in that the lifting unit (2) further comprises a second non return valve (27),
an oil inlet of the second one-way valve (27) is communicated with an oil outlet of the power output unit (1), and an oil outlet of the second one-way valve (27) is communicated with a first oil port (a) of the first reversing valve (21).
5. The hydraulic control system according to claim 1, characterized in that it further comprises a pressure control unit (4);
the pressure control unit (4) comprises an overflow valve (41), an oil inlet (a) of the overflow valve (41) is communicated with a remote control pressure port of the power output unit (1), an oil outlet (b) of the overflow valve (41) is communicated with an oil inlet of the power output unit (1), and a control oil port (c) of the overflow valve (41) is communicated with the oil inlet (a) of the overflow valve.
6. The hydraulic control system according to claim 5, characterized in that the pressure control unit (4) further comprises a second directional control valve (42);
the first oil port (a) of the second reversing valve (42) is communicated with a remote control pressure port of the power output unit (1), the second oil port (b) of the second reversing valve (42) is communicated with an oil inlet of the power output unit (1), and the third oil port (c) of the second reversing valve (42) is communicated with an oil outlet (b) of the overflow valve (41).
7. The hydraulic control system according to claim 5, characterized in that the relief valve (41) is an electromagnetic proportional relief valve.
8. The hydraulic control system of claim 6, further comprising a controller electrically connected to the first directional valve (21), the second directional valve (42), and the spill valve (41).
9. The hydraulic control system according to any one of claims 1-8, characterized in that the power take-off unit (1) comprises an electric motor (11) and a main pump (12), a tank (13);
the motor (11) is used for driving the main pump (12), an oil inlet of the main pump (12) is communicated with the oil tank (13), and an oil outlet of the main pump (12) is communicated with a first oil port (a) of the first reversing valve (21).
10. The hydraulic control system of claim 9, wherein the power take-off unit further includes a filter (14);
an oil inlet of the filter (14) is communicated with the oil tank (13), and an oil outlet of the filter (14) is communicated with an oil inlet of the main pump (12).
CN202110992074.8A 2021-08-27 2021-08-27 Hydraulic control system for lifting platform Active CN113845062B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116928162A (en) * 2023-09-15 2023-10-24 启东中远海运海洋工程有限公司 Hydraulic system with energy recovery function for ocean lifting platform

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Publication number Priority date Publication date Assignee Title
CN102767545A (en) * 2012-08-07 2012-11-07 安奥克斯汤姆逊(青岛)游艇有限公司 Four-cylinder synchronous hydraulic system
CN103708376A (en) * 2013-12-17 2014-04-09 天津大学 Control structure for large-displacement synchronous jacking of large-scale deck pieces
CN111908362A (en) * 2020-08-31 2020-11-10 广西桂冠电力股份有限公司大化水力发电总厂 Main transformer jacking method and device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102767545A (en) * 2012-08-07 2012-11-07 安奥克斯汤姆逊(青岛)游艇有限公司 Four-cylinder synchronous hydraulic system
CN103708376A (en) * 2013-12-17 2014-04-09 天津大学 Control structure for large-displacement synchronous jacking of large-scale deck pieces
CN111908362A (en) * 2020-08-31 2020-11-10 广西桂冠电力股份有限公司大化水力发电总厂 Main transformer jacking method and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116928162A (en) * 2023-09-15 2023-10-24 启东中远海运海洋工程有限公司 Hydraulic system with energy recovery function for ocean lifting platform
CN116928162B (en) * 2023-09-15 2023-12-19 启东中远海运海洋工程有限公司 Hydraulic system with energy recovery function for ocean lifting platform

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