CN111536094A - Landing leg control mechanism and engineering vehicle - Google Patents

Landing leg control mechanism and engineering vehicle Download PDF

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Publication number
CN111536094A
CN111536094A CN202010416666.0A CN202010416666A CN111536094A CN 111536094 A CN111536094 A CN 111536094A CN 202010416666 A CN202010416666 A CN 202010416666A CN 111536094 A CN111536094 A CN 111536094A
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CN
China
Prior art keywords
oil
valve
hydraulic
leg
valves
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Pending
Application number
CN202010416666.0A
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Chinese (zh)
Inventor
张朋
王建华
盛伟
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Sany Heavy Machinery Ltd
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Sany Heavy Machinery Ltd
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Publication date
Application filed by Sany Heavy Machinery Ltd filed Critical Sany Heavy Machinery Ltd
Priority to CN202010416666.0A priority Critical patent/CN111536094A/en
Publication of CN111536094A publication Critical patent/CN111536094A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S9/00—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks
    • B60S9/02—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for only lifting or supporting
    • B60S9/10—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for only lifting or supporting by fluid pressure
    • B60S9/12—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for only lifting or supporting by fluid pressure of telescopic type
    • 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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The invention provides a supporting leg control mechanism and an engineering vehicle, and belongs to the technical field of engineering vehicles. The landing leg control mechanism includes: the oil pump, the hand valve, oil circuit switching-over valves, the electromagnetism valves, a plurality of landing leg hydro-cylinders and a plurality of hydraulic pressure lock that correspond the connection with the landing leg hydro-cylinder respectively, the export of oil pump respectively with the oil inlet of hand valve, the oil inlet of oil circuit switching-over valves and the oil inlet intercommunication of electromagnetism valves, two exit ends of hand valve are connected with two control ends of oil circuit switching-over valves respectively, a work position for controlling oil circuit switching-over valves, the electromagnetism valves include a plurality of parallelly connected solenoid valves that set up, the export of a plurality of solenoid valves communicates with the pressure control oil mouth of a plurality of hydraulic pressure locks respectively, two imports and two exports of hydraulic pressure lock communicate with two exports of oil circuit switching-over valves and oil inlet and the oil return opening of landing leg hydro-cylinder respectively, and two imports of hydraulic. The invention can realize the multi-support control, and has simple control structure and low cost.

Description

Landing leg control mechanism and engineering vehicle
Technical Field
The invention relates to the technical field of engineering vehicles, in particular to a supporting leg control mechanism and an engineering vehicle.
Background
Many engineering vehicles need to adopt the strutting arrangement to realize the support during operation, and the strutting arrangement is used for making engineering vehicle can stable support on ground when the operation, and strutting arrangement directly bears engineering vehicle's load power and weight to avoid engineering vehicle to cause the rollover of whole car because of the overload when the operation. The support means typically comprises four legs, each having two states, stowed and extended. When the engineering vehicle moves, the supporting legs need to be retracted so as to move conveniently; when the engineering vehicle is in a construction state, the supporting legs need to be extended out to realize supporting.
The retraction or extension of the supporting legs is realized through a hydraulic system, the conventional hydraulic system for controlling the supporting legs usually needs a plurality of hydraulic elements to be comprehensively applied to realize the retraction and extension control of a plurality of supporting legs, and the control structure is complex and high in cost.
Disclosure of Invention
The invention aims to provide a supporting leg control mechanism and an engineering vehicle, which can realize the control of a plurality of supporting legs, and have simple control structure and low cost.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiments of the present invention, there is provided a leg control mechanism for a work support of an engineering vehicle, the mechanism including: the oil pump, the hand valve, oil circuit switching-over valves, the electromagnetism valves, a plurality of landing leg hydro-cylinders and a plurality of hydraulic pressure lock that corresponds the connection with the landing leg hydro-cylinder respectively, the oil-out of oil pump respectively with the oil inlet of hand valve, the oil inlet of oil circuit switching-over valves and the oil inlet intercommunication of electromagnetism valves, two oil-outs of hand valve are connected with two control ends of oil circuit switching-over valves respectively, a work position for selecting oil circuit switching-over valves through the control end, the electromagnetism valves include a plurality of parallelly connected solenoid valves that set up, the oil-out of a plurality of solenoid valves communicates with the pressure control oil mouth of a plurality of hydraulic pressure locks respectively, two oil inlets of hydraulic pressure lock communicate with two oil-outs of oil circuit switching-over valves respectively, two oil-.
Optionally, the number of the leg cylinders is four, and the leg cylinders are respectively arranged at the tire positions of the engineering vehicle, and the hydraulic locks and the electromagnetic valves are respectively arranged in the same number as the leg cylinders and are correspondingly connected with the leg cylinders.
Optionally, the oil way reversing valve group comprises a hydraulic control reversing valve and two overflow valves, and the two overflow valves are respectively communicated with two oil outlets of the hydraulic control reversing valve.
Optionally, the hand valve includes a left hand valve and a right hand valve, an oil outlet of the left hand valve is connected to the lower control end of the hydraulic control directional valve, and an oil outlet of the right hand valve is connected to the upper control end of the hydraulic control directional valve.
Optionally, the oil path reversing group comprises a pressure compensation valve, an electro-hydraulic reversing valve, two first check valves and two pressure control valves, oil inlets of the two first check valves are respectively communicated with oil outlets of the oil pump through the pressure compensation valve, oil outlets of the two first check valves are respectively communicated with two oil inlets of the electro-hydraulic reversing valve, and two oil outlets of the electro-hydraulic reversing valve are respectively communicated with the two pressure control valves.
Optionally, the hand valve comprises a left hand valve and a right hand valve, an outlet of the left hand valve is connected with a lower control end of the electro-hydraulic directional valve, and an outlet of the right hand valve is connected with an upper control end of the electro-hydraulic directional valve.
Optionally, the hydraulic lock is a double pilot operated check valve.
In another aspect of the embodiments of the present invention, there is provided an engineering vehicle, including: the engineering vehicle body comprises an upper vehicle body and a lower vehicle body, the handle is arranged in the lower vehicle body, the lower vehicle body is connected with the supporting leg control mechanism, and a hand valve in the supporting leg control mechanism is connected with the handle through a valve core.
Optionally, the handle comprises a left handle and a right handle, the hand valve comprises a left hand valve and a right hand valve, the left handle is connected with the valve core of the left hand valve, and the right handle is connected with the valve core of the right hand valve.
The embodiment of the invention has the beneficial effects that:
according to the support leg control mechanism and the engineering vehicle provided by the embodiment of the invention, the system structure of the multi-leg oil cylinder control mechanism is simple and the cost is low through the combined action of the hydraulic lock, the hand valve, the oil way reversing valve group, the multi-leg oil cylinder and the electromagnetic valve assembly. The landing leg control mechanism is used for the operation of engineering vehicle to support, and wherein, this mechanism includes: the hydraulic lock is used for controlling the locking of the supporting leg oil cylinder, and the safety of the supporting device is improved. The oil outlet of the oil pump is respectively communicated with the oil inlet of the hand valve, the oil inlet of the oil way reversing valve group and the oil inlet of the electromagnetic valve group, and the two oil outlets of the hand valve are respectively connected with the two control ends of the oil way reversing valve group and used for selecting the working position of the oil way reversing valve group through the control ends. The solenoid valve group comprises a plurality of solenoid valves arranged in parallel, oil outlets of the solenoid valves are communicated with pressure control oil ports of a plurality of corresponding hydraulic locks respectively, the solenoid valves are used for providing valve cores for opening hydraulic control one-way valves, so that the one-way hydraulic valves can be reversely circulated, two oil inlets of the hydraulic locks are communicated with two oil outlets of the oil way reversing valve group respectively, two oil outlets of the hydraulic locks are communicated with an oil inlet and an oil return port of a supporting leg oil cylinder respectively, and two oil inlets of the hydraulic locks are communicated with two oil outlets of the hydraulic locks. Therefore, the supporting leg control mechanism can realize the control of the supporting leg oil cylinders only by arranging the hand valve and the oil way reversing valve group, so that the actions of the supporting legs are controlled, the control structure is simple, and the cost is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a leg control mechanism according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a connection relationship between a hydraulic lock and a leg cylinder in the leg control mechanism according to the embodiment of the present invention.
Icon: 10-an oil pump; 20-hand valve; 21-left hand valve; 22-right hand valve; 30-an electromagnetic valve group; 31-left front solenoid valve; 32-right front solenoid valve; 33-left rear solenoid valve; 34-right rear electromagnetic valve; 40-oil way reversing valve group; 41-a pressure compensation valve; 42-electro-hydraulic directional valves; 43-a one-way valve; 44-a pressure control valve; 50-hydraulic lock; 51-left front hydraulic lock; 52-right front hydraulic lock; 53-left rear hydraulic lock; 54-right rear hydraulic lock; 60-supporting leg oil cylinders; 61-left front leg cylinder; 62-a right front leg cylinder; 63-left rear leg oil cylinder; and 64-right rear support leg oil cylinder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and in a manner that would be apparent to those of ordinary skill in the art and in a specific context to which such terms are intended.
At present, a plurality of engineering vehicles need to be supported by a supporting device during working, and the supporting device is used for enabling the engineering vehicles to be stably supported on the ground during working so as to avoid the overturning of the whole engineering vehicle caused by overlarge load during working. The support means typically comprises four legs, each having two states, stowed and extended. When the engineering vehicle moves, the supporting legs need to be retracted so as to move conveniently; when the engineering vehicle is in a construction state, the supporting legs need to be extended out to realize supporting. The retraction or extension of the legs is achieved by means of a hydraulic system, which is currently controlled by means of a plurality of operating hand valves and which is complex in structure, involves the use of a plurality of hydraulic elements and is costly. In order to solve the above problems, the present embodiment provides a leg control mechanism and a work vehicle, and the present embodiment is described in detail below.
Fig. 1 is a schematic structural diagram of a leg control mechanism provided in the present invention, and referring to fig. 1, an embodiment of the present invention provides a leg control mechanism for an operation support of an engineering vehicle, the leg control mechanism including: the hydraulic control system comprises an oil pump 10, a hand valve 20, an oil way reversing valve group 40, an electromagnetic valve group 30, a plurality of supporting leg oil cylinders 60 and a plurality of hydraulic locks 50 which are respectively and correspondingly connected with the supporting leg oil cylinders 60, wherein an oil outlet of the oil pump 10 is respectively communicated with an oil inlet of the hand valve 20, an oil inlet of the oil way reversing valve group 40 and an oil inlet of the electromagnetic valve group 30, two oil outlets of the hand valve 20 are respectively connected with two control ends of the oil way reversing valve group 40, the hydraulic control system is used for selecting a working position of the oil way reversing valve group 40 through a control end, the electromagnetic valve group 30 comprises a plurality of electromagnetic valves which are arranged in parallel, oil outlets of the electromagnetic valves are respectively communicated with pressure control oil ports of a plurality of hydraulic locks 50, two oil inlets of the hydraulic locks 50 are respectively communicated with two oil outlets of the oil way reversing valve group 40, two oil outlets of the hydraulic locks 50 are respectively communicated with an oil inlet and an oil return port of a supporting leg oil cylinder 60, and two oil inlets of the hydraulic locks 50 are mutually communicated with two oil outlets of the hydraulic locks 50.
It should be noted that, first, the oil pump 10 is a lightweight and compact pump, and has three major categories, i.e., an inline type, a distribution type, and a single type. The oil pump 10 is operated by a power source, and a lower camshaft is driven by a crankshaft gear of the engine. For example, a gear pump is a rotary pump that delivers or pressurizes a liquid by virtue of a change in displacement volume and movement between a pump cylinder and a meshing gear. Two gears, pump body and front and back covers form two closed spaces, when the gears rotate, the space on the gear disengagement side becomes larger from smaller to larger to form vacuum to suck liquid, and the space on the gear engagement side becomes smaller from larger to smaller to squeeze liquid into the pipeline. The suction chamber and the discharge chamber are separated by a meshing line of two gears. The pressure at the discharge of the gear pump is entirely dependent on the amount of resistance at the pump outlet.
Second, the hand valve 20 controls the extension or retraction of the movable end of the leg cylinder 60 through the oil direction switching valve group 40. The solenoid valve set 30 is used to control whether the plurality of hydraulic locks 50 are locked, thereby controlling whether the leg cylinder 60 is locked.
For example, please refer to fig. 1 and fig. 2, an electromagnetic valve operating instruction is sent to the electromagnetic valve group 30, so that the corresponding electromagnetic valve in the electromagnetic valve group 30 is powered on, the powered electromagnetic valve controls the pressure control oil port of the corresponding hydraulic lock 50, so that the hydraulic lock 50 is unlocked, once the hydraulic lock 50 is unlocked, the leg cylinder 60 corresponding to the hydraulic lock 50 is activated, that is, the leg cylinder 60 is unlocked, the hand valve 20 controls the operating state of the oil way switching valve group 40, that is, controls the operating position of the oil way switching valve group 40, and different operating positions of the oil way switching valve group 40 mean different actions of the leg cylinder 60, for example, if the hand valve 20 controls the upper operation of the oil way switching valve group 40, the movable end of the leg cylinder 60 extends, and the hand valve 20 controls the lower operation of the oil way switching valve group 40, and the movable end of the leg cylinder 60 retracts. Through the combined action of hand valve 20 and solenoid valve group 30, realize the control process to a plurality of landing leg hydro-cylinders 60, control simple structure, the hydraulic component that uses is less relatively to the cost has been reduced.
According to the support leg control mechanism and the engineering vehicle provided by the embodiment of the invention, the hydraulic lock 50, the hand valve 20, the oil way reversing valve group 40, the multi-support leg oil cylinder 60 and the electromagnetic valve group 30 act together, so that the support leg oil cylinder 60 control mechanism is simple in system structure and low in cost. The landing leg control mechanism is used for the operation of engineering vehicle to support, and wherein, this mechanism includes: the oil pump 10, the hand valve 20, the oil way reversing valve group 40, the electromagnetic valve group 30, the plurality of supporting leg oil cylinders 60 and the plurality of hydraulic locks 50 which are respectively connected with the supporting leg oil cylinders 60 correspondingly, wherein the hydraulic locks 50 are used for controlling the locking of the supporting leg oil cylinders 60, and the safety of the supporting device is improved. An oil outlet of the oil pump 10 is respectively communicated with an oil inlet of the hand valve 20, an oil inlet of the oil path reversing valve group 40 and an oil inlet of the electromagnetic valve group 30, and two oil outlets of the hand valve 20 are respectively connected with two control ends of the oil path reversing valve group 40 and used for selecting a working position of the oil path reversing valve group 40 through the control ends. The electromagnetic valve group 30 comprises a plurality of electromagnetic valves arranged in parallel, oil outlets of the electromagnetic valves are communicated with pressure control oil ports of a plurality of corresponding hydraulic locks 50 respectively, the electromagnetic valves are used for providing valve cores for opening hydraulic control one-way valves, so that the one-way hydraulic valves can be reversely circulated, two oil inlets of the hydraulic locks 50 are communicated with two oil outlets of the oil way reversing valve group 40 respectively, two oil outlets of the hydraulic locks 50 are communicated with an oil inlet and an oil return port of the supporting leg oil cylinder 60 respectively, and two oil inlets of the hydraulic locks 50 are communicated with two oil outlets of the hydraulic locks 50. As can be seen from the above, the supporting leg control mechanism can realize the control of a plurality of supporting leg oil cylinders 60 only by arranging one hand valve 20 and one oil way reversing valve group 40, so as to control the actions of a plurality of supporting legs, and has simple control structure and low cost.
Referring to fig. 1, further, the number of the leg cylinders 60 is four, and the four leg cylinders are respectively disposed at tire positions of the engineering vehicle, and the hydraulic locks 50 and the electromagnetic valves are respectively disposed in the same number as the leg cylinders 60 and are correspondingly connected to the leg cylinders.
The four leg cylinders 60 include a front left leg cylinder 61, a front right leg cylinder 62, a rear left leg cylinder 63, and a rear right leg cylinder 64. The four hydraulic locks 50 include a left front hydraulic lock 51, a right front hydraulic lock 52, a left rear hydraulic lock 53, and a right rear hydraulic lock 54. The solenoid valve group 30 includes a left front solenoid valve 31, a right front solenoid valve 32, a left rear solenoid valve 33, and a right rear solenoid valve 34.
Illustratively, the left front leg motion is controlled: the left front solenoid valve 31 in the control solenoid valve group 30 is powered, the left front solenoid valve 31 is powered to control the left front hydraulic lock 51 to unlock, when the left front hydraulic lock 51 unlocks, the left front leg cylinder 61 is activated, and the hand valve 20 controls the working position of the oil circuit switching valve group 40, so that the extension or retraction of the left front leg cylinder 61 is controlled. Similarly, the control process of controlling the action of the right front leg, the action of the left rear leg, or the action of the right rear leg is the same as that of the left front leg.
Illustratively, the left front leg and the right rear leg are controlled simultaneously: the left front electromagnetic valve 31 and the right rear electromagnetic valve 34 in the control electromagnetic valve group 30 are respectively electrified, the left front electromagnetic valve 31 is electrified to control the left front hydraulic lock 51 to unlock, the right rear electromagnetic valve 34 is electrified to control the right rear hydraulic lock 54 to unlock, when the left front hydraulic lock 51 unlocks, the left front leg oil cylinder 61 is activated, when the right rear hydraulic lock 54 unlocks, the right rear leg oil cylinder 64 is activated, the hand valve 20 controls the working position of the oil circuit switching valve group 40, so that the left front leg oil cylinder 61 and the right rear leg oil cylinder 64 are controlled to extend or retract, and the right front leg oil cylinder 62 and the left rear leg oil cylinder 63 are kept in a locked state. Similarly, simultaneous control of the right front leg and left rear leg actions means that the right front leg cylinder 62 and left rear leg cylinder 63 are activated. By analogy, if the actions of the front left leg, the front right leg and the rear left leg are to be realized, the front left leg cylinder 61, the front right leg cylinder 62 and the rear left leg cylinder 63 are activated, and similarly, if the actions of the front left leg, the front right leg, the rear left leg and the rear right leg are to be realized, the front left leg cylinder 61, the front right leg cylinder 62, the rear left leg cylinder 63 and the rear right leg cylinder 64 are required to be simultaneously activated. The combination of leg motions in the present embodiment may also be in other forms, and is not limited to the combination of leg motions given above.
The oil-way reversing valve group 40 in this embodiment may be implemented by different reversing valve groups, and optionally, the oil-way reversing valve group 40 includes a hydraulic control reversing valve (not shown in the figure) and two overflow valves, and the two overflow valves are respectively communicated with two oil outlets of the hydraulic control reversing valve.
It should be noted that, the function of the overflow valve is to ensure the safety of the oil path, that is, the overflow valve plays a role in safety protection in the system. When the system pressure exceeds the specified value, the overflow valve is pushed open to discharge the hydraulic oil in the system out of the mailbox, so that the system pressure does not exceed the allowable value, and the system is ensured not to have accidents due to overhigh pressure. The main parameter of the overflow valve is the discharge capacity, which is determined by the caliber of the valve seat and the opening height of the valve clack, and the discharge capacity is divided into a micro-opening type and a full-opening type according to the difference of the opening heights. The micro-opening type means that the opening height of the valve clack is 1/40-1/20 of the throat diameter of the valve seat. The full-open type means that the opening height of the valve clack is 1/4 of the throat diameter of the valve seat.
Illustratively, two oil inlet ends of the high-pressure electromagnetic directional valve are respectively communicated with an oil outlet of the oil pump 10, and two oil outlets of the high-pressure electromagnetic directional valve are respectively communicated with two oil inlets of the hydraulic lock 50 through two overflow valves. Two oil outlets of the hand valve 20 are respectively connected with two control ends of the high-pressure electromagnetic directional valve, and the two oil outlets of the hand valve 20 respectively control the upper position, the middle position or the lower position of the high-pressure electromagnetic directional valve to work.
Referring to fig. 1, further, the hand valve 20 includes a left hand valve 21 and a right hand valve 22, an oil outlet of the left hand valve 21 is connected to a lower control end of the hydraulic control directional valve, and an oil outlet of the right hand valve 22 is connected to an upper control end of the hydraulic control directional valve.
Illustratively, when the left-hand valve 21 is operated, i.e., the left-hand valve 21 controls the lower position of the pilot-operated directional control valve to be powered, i.e., the lower position of the pilot-operated directional control valve is operated, i.e., the leg cylinder 60 is controlled to perform the retracting action. When the right-hand valve 22 works, namely the right-hand valve 22 controls the upper position of the hydraulic control reversing valve to be electrified, namely the hydraulic control reversing valve works in the upper position, namely the support leg oil cylinder 60 is controlled to do extending action. When the left-hand valve 21 and the right-hand valve 22 do not act, the working position of the hydraulic control reversing valve is in the middle position, and the oil in the oil pump 10 cannot flow through the valve body of the hydraulic control reversing valve.
The above description provides an embodiment of the oil circuit reversing valve group 40, and here, another embodiment of the oil circuit reversing valve group 40 in this embodiment is given, optionally, the oil circuit reversing valve group 40 includes a pressure compensation valve 41, an electro-hydraulic reversing valve 42, two first check valves 43, and two pressure control valves 44, oil inlets of the two first check valves 43 are respectively communicated with oil outlets of the oil pump 10 through the pressure compensation valve 41, oil outlets of the two first check valves 43 are respectively communicated with two oil inlets of the electro-hydraulic reversing valve 42, and two oil outlets of the electro-hydraulic reversing valve 42 are respectively communicated with the two pressure control valves 44.
It should be noted that, first, the load-sensitive pressure compensation control system, the pressure compensation valve including the pre-valve pressure compensation load-sensitive system and the post-valve pressure compensation load-sensitive system, is based on the position of the pressure compensation valve 41 disposed in the entire hydraulic circuit. Pre-valve compensation means that a pressure compensation valve is arranged between the oil pump and the pilot valve, and post-valve compensation means that a pressure compensation valve 41 is arranged between the pilot valve and the actuator. The pressure compensation valve 41 in this embodiment belongs to post-valve compensation. By reducing the flow rate supply to each load in the same ratio (valve opening amount), the effect of coordinating the operation is achieved, that is: when the flow provided by the oil pump 10 cannot meet the flow required by the system, the flow distribution compensated before the valve is related to the load, and the flow distribution compensated after the valve is not related to the load, but only the opening amount of the main valve.
Secondly, the electro-hydraulic directional valve 42 is a hydraulic directional valve integrated with an electromagnetically operated pilot valve, and the spool of the electro-hydraulic directional valve 42 is pushed by pressure oil in a control oil path to realize the switching of the oil path. When the two electromagnetic valve coils of the electro-hydraulic directional valve 42 are electrified, the balance hole loop is closed, the drain hole loop is opened, the upper piston cavity is drained, the piston moves upwards, and the valve is opened. Otherwise, the piston moves downwards, and the valve is closed. In the process of opening and closing the valve, a flow (flow velocity) signal and a valve plug position signal can be transmitted to a computer, and a corresponding instruction is sent out after the signals are processed by the computer to control the on-off states of the two electromagnetic pilot valves, so that the hydraulic pressure difference of the upper cavity and the lower cavity of the piston is changed, the piston is controlled at a required opening height, and the control on the medium flow of the pipeline is realized.
Further, the hand valve 20 comprises a left hand valve 21 and a right hand valve 22, the outlet of the left hand valve 21 is connected with the lower control end of the electro-hydraulic directional valve 42, and the outlet of the right hand valve 22 is connected with the upper control end of the electro-hydraulic directional valve 42.
For example, when the left-hand valve 21 is operated, i.e., the left-hand valve 21 controls the lower position of the electro-hydraulic directional valve 42 to be energized, i.e., the electro-hydraulic directional valve 42 is operated to be in the lower position, the hydraulic oil of the oil pump 10 enters the electro-hydraulic directional valve 42 through the pressure compensation valve 41, i.e., the support leg oil cylinder 60 is controlled to perform the extending action. Similarly, when the right-hand valve 22 is operated, namely the right-hand valve 22 controls the upper position of the electro-hydraulic directional valve 42 to be electrified, namely the electro-hydraulic directional valve 42 is operated to be upper position, namely the support leg oil cylinder 60 is controlled to do retracting action. When the left-hand valve 21 and the right-hand valve 22 are not actuated, the working position of the electro-hydraulic directional valve 42 is in the neutral position, and the oil in the oil pump 10 does not flow through the valve body of the electro-hydraulic directional valve 42.
Further, referring to fig. 2, the hydraulic lock 50 is a double hydraulic control check valve.
Referring to fig. 2, a port a represents an oil inlet of a rodless cavity of the oil cylinder, a port B represents an oil inlet of a rod cavity of the oil cylinder, a port P represents a hydraulic lock control oil port, and a port T represents an oil drainage oil port.
When the supporting leg oil cylinder 60 extends out, the oil inlet of the P port in the hydraulic lock 50 enables the two hydraulic control check valves to be opened, hydraulic oil flows in from the port A and flows out from the port B, similarly, when the supporting leg oil cylinder 60 retracts, the oil inlet of the P port in the hydraulic lock 50 enables the two hydraulic control check valves to be opened, and the hydraulic oil flows in from the port B and flows out from the port A.
In another aspect of the embodiments of the present invention, there is provided an engineering vehicle, including: the engineering vehicle body comprises an upper vehicle body and a lower vehicle body, the handle is arranged in the lower vehicle body, the lower vehicle body is connected with the supporting leg control mechanism, and a hand valve 20 in the supporting leg control mechanism is connected with the handle through a valve core.
The handle is connected to the valve element of the hand valve 20, and the valve element can be controlled by the handle, so that the hand valve 20 can be controlled. The landing leg control mechanism is applied to the engineering vehicle, and can enable the engineering vehicle body to be stably supported on the ground when the engineering vehicle works, so that the engineering vehicle body is prevented from tipping over due to overlarge load force when the engineering vehicle works.
Further, the handle in the engineering vehicle comprises a left handle and a right handle, the hand valve comprises a left-hand valve 21 and a right-hand valve 22, the left handle is connected with a valve core of the left-hand valve 21, and the right handle is connected with a valve core of the right-hand valve 22.
It should be noted that the handle includes a left handle and a right handle, and illustratively, the left handle is used to control the extension of the leg, and the right handle controls the retraction of the leg. The hand valve 20 comprises a left hand valve 21 and a right hand valve 22, the left hand valve 21 controls the electro-hydraulic directional valve 42 to work at the lower position, and the right hand valve 22 controls the electro-hydraulic directional valve 42 to work at the upper position. For example, when the corresponding support leg needs to be controlled to extend, the left handle acts to push the valve core of the left-hand valve 21 to move, so that hydraulic oil flows through the left-hand valve 21, and the electro-hydraulic directional valve 42 is controlled to work at the lower position, so that the support leg is controlled to extend, and vice versa.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A leg control mechanism for a work support of a work vehicle, comprising: an oil pump, a hand valve, an oil way reversing valve group, an electromagnetic valve group, a plurality of supporting leg oil cylinders and a plurality of hydraulic locks which are respectively and correspondingly connected with the supporting leg oil cylinders, the oil outlet of the oil pump is respectively communicated with the oil inlet of the hand valve, the oil inlet of the oil way reversing valve group and the oil inlet of the electromagnetic valve group, two oil outlets of the hand valve are respectively connected with two control ends of the oil way reversing valve set, the electromagnetic valve group comprises a plurality of electromagnetic valves which are arranged in parallel, oil outlets of the electromagnetic valves are respectively communicated with pressure control oil ports of the hydraulic locks, two oil inlets of the hydraulic lock are respectively communicated with two oil outlets of the oil way reversing valve group, and two oil outlets of the hydraulic lock are respectively communicated with an oil inlet and an oil return port of the supporting leg oil cylinder.
2. The leg control mechanism according to claim 1, wherein the leg cylinders include four leg cylinders for being respectively disposed at tire positions of the working vehicle, and the hydraulic locks and the solenoid valves are respectively disposed in the same number as and correspondingly connected to the leg cylinders.
3. The leg control mechanism according to claim 1, wherein the oil path directional valve set includes a pilot operated directional valve and two overflow valves, and the two overflow valves are respectively communicated with two oil outlets of the pilot operated directional valve.
4. The leg control mechanism according to claim 3, wherein the hand valve includes a left hand valve and a right hand valve, an oil outlet of the left hand valve is connected to the lower control end of the hydraulic control directional valve, and an oil outlet of the right hand valve is connected to the upper control end of the hydraulic control directional valve.
5. The leg control mechanism according to claim 1, wherein the oil way reversing valve group comprises a pressure compensation valve, an electro-hydraulic reversing valve, two first check valves and two pressure control valves, oil inlets of the two first check valves are respectively communicated with an oil outlet of the oil pump through the pressure compensation valve, oil outlets of the two first check valves are respectively communicated with two oil inlets of the electro-hydraulic reversing valve, and two oil outlets of the electro-hydraulic reversing valve are respectively communicated with the two pressure control valves.
6. The leg control mechanism according to claim 5, wherein the hand valve comprises a left hand valve and a right hand valve, an oil outlet of the left hand valve is connected with a lower control end of the electro-hydraulic directional valve, and an oil outlet of the right hand valve is connected with an upper control end of the electro-hydraulic directional valve.
7. The leg control mechanism of claim 1, wherein the hydraulic lock is a double pilot operated check valve.
8. An engineering vehicle, characterized by comprising a handle, an engineering vehicle body and the support leg control mechanism as claimed in any one of claims 1 to 7, wherein the engineering vehicle body comprises an upper vehicle body and a lower vehicle body, the handle is arranged in the lower vehicle body, the lower vehicle body is connected with the support leg control mechanism, and a hand valve in the support leg control mechanism is connected with the handle through a valve core.
9. The work vehicle of claim 8, wherein said handle comprises a left handle and a right handle, and said hand valve comprises a left hand valve and a right hand valve, said left handle being connected to said left hand valve spool and said right handle being connected to said right hand valve spool.
CN202010416666.0A 2020-05-15 2020-05-15 Landing leg control mechanism and engineering vehicle Pending CN111536094A (en)

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Application Number Priority Date Filing Date Title
CN202010416666.0A CN111536094A (en) 2020-05-15 2020-05-15 Landing leg control mechanism and engineering vehicle

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CN202010416666.0A CN111536094A (en) 2020-05-15 2020-05-15 Landing leg control mechanism and engineering vehicle

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201620434U (en) * 2009-12-31 2010-11-03 福田雷沃国际重工股份有限公司 Hydraulic circuit device for coordinating body rotation and movable arm swing of digging machine
CN103511367A (en) * 2013-10-14 2014-01-15 陕西盛迈石油有限公司 Lifting hydraulic system of movable arm of loader
CN104002720A (en) * 2014-06-05 2014-08-27 襄阳市华拓电工器材制造有限公司 Cable pay-off specialized vehicle
CN207246157U (en) * 2017-08-18 2018-04-17 上海中港天辰科技有限公司 A kind of food car emergency hydraulic system
CN209569212U (en) * 2019-02-22 2019-11-01 山推工程机械股份有限公司 A kind of hydrostatic bull-dozer work, guide, repairing integrated hydraulic system
CN110486341A (en) * 2018-05-14 2019-11-22 博世力士乐（北京）液压有限公司 Hydraulic control system and mobile working equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201620434U (en) * 2009-12-31 2010-11-03 福田雷沃国际重工股份有限公司 Hydraulic circuit device for coordinating body rotation and movable arm swing of digging machine
CN103511367A (en) * 2013-10-14 2014-01-15 陕西盛迈石油有限公司 Lifting hydraulic system of movable arm of loader
CN104002720A (en) * 2014-06-05 2014-08-27 襄阳市华拓电工器材制造有限公司 Cable pay-off specialized vehicle
CN207246157U (en) * 2017-08-18 2018-04-17 上海中港天辰科技有限公司 A kind of food car emergency hydraulic system
CN110486341A (en) * 2018-05-14 2019-11-22 博世力士乐（北京）液压有限公司 Hydraulic control system and mobile working equipment
CN209569212U (en) * 2019-02-22 2019-11-01 山推工程机械股份有限公司 A kind of hydrostatic bull-dozer work, guide, repairing integrated hydraulic system

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Application publication date: 20200814