CN106468294B - Straight line moving control valve, straight line moving control system and excavator - Google Patents

Straight line moving control valve, straight line moving control system and excavator Download PDF

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Publication number
CN106468294B
CN106468294B CN201510512183.XA CN201510512183A CN106468294B CN 106468294 B CN106468294 B CN 106468294B CN 201510512183 A CN201510512183 A CN 201510512183A CN 106468294 B CN106468294 B CN 106468294B
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oil
control valve
straight line
hydraulic fluid
fluid port
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CN106468294A (en
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薛源
孙辉
翟海燕
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Construction Machinery Branch of XCMG
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Construction Machinery Branch of XCMG
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  • Multiple-Way Valves (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

The present invention relates to a kind of straight line moving control valve, straight line moving control system and excavator.The straight line moving control valve includes main control valve and four external hydraulic fluid ports, wherein first, first control valve pocket connection of the 3rd external hydraulic fluid port and main control valve, second, second control valve pocket connection of the 4th external hydraulic fluid port and main control valve, to control main control valve to switch between the first spool position and the second spool position, it is sized so that main control valve is in different on off operating modes by compare the pressure differential between the first external hydraulic fluid port and the second external hydraulic fluid port and the pressure differential between the 4th external hydraulic fluid port and the 3rd external hydraulic fluid port, so as to control the on off operating mode from the different oil circuits of each oil inlet and outlet of main control valve connection.The straight line moving control valve is applied in straight line moving control system, four external hydraulic fluid ports is connected with flow pressure-difference conversion equipment, and suitably connects the oil inlet and outlet of main control valve, straight line moving control valve can control straight line moving.

Description

Straight line moving control valve, straight line moving control system and excavator
Technical field
The present invention relates to engineering machinery hydraulic control technology field, more particularly to a kind of straight line moving control valve, linear rows Walk control system and excavator.
Background technology
The requirement of some engineering machinery keeps straight line moving in operation, such as is widely used in industry and civil buildings, agriculture Excavator in the engineering constructions such as water in field profit, road and bridge, mine excavation, municipal administration, its working environment is severe, composite move frequency It is numerous, especially when carrying out crossing the operation such as irrigation canals and ditches or climbing descending, it is necessary to realize straight line moving and other executing agencies of getting on the bus The composite move of (swing arm, dipper, scraper bowl, revolution etc.), generally it is this while advance or retrogressing manipulate revolution, swing arm or The composite move of dipper motion is referred to as composite move of walking.
Two main pumps are typically provided with currently used excavator hydraulic system, when excavator is only walked and execution machine of getting on the bus When structure does not work, two main pumps independently give left and right running motor fuel feeding, because the output flow of two main pumps is equal, and liquid Force feed only supplies running motor, therefore the flow for flowing through left and right running motor is equal, and the rotating speed of left and right running motor is identical, so as to Excavator can realize straight line moving；And when excavator performs walking composite move, left and right running motor and execution of getting on the bus Mechanism is in working condition, and now one of pump should give running motor fuel feeding, gives actuator fuel feeding of getting on the bus again, and another One pump then only gives running motor fuel feeding, this result in flow into left and right running motor flow it is no longer equal, excavator is then Easily to the less running motor side sideslip of fuel supply flow rate, cause excavator can not keep straight line moving again.
Straight line moving ability when walking composite move, currently used technological means are being performed in order to improve excavator It is that straight travel valve is set in excavator hydraulic system, after the straight travel valve is opened, hydraulic system is by original two Main pump is respectively both sides running motor fuel feeding, and it is only left and right running motor fuel feeding to be changed into a main pump, and another main pump is then Get on the bus actuator fuel feeding, it is independent from complex conditions that this allows for running gear, and excavator linear rows are improved so as to reach Walk the purpose of ability.
However, the technical scheme of this set straight line moving control valve, its can only left and right running motor load it is identical Shi Caineng make excavator keep straight line moving, once and the load of left and right running motor is different, sideslip still occurs in excavator The problem of even turning, this is due to that the different pressure caused on the oil-feed oil circuit of both sides running motor of load are different, and load is big A lateral pressure it is larger, it is smaller to load a small lateral pressure, and hydraulic oil always flows to low-pressure area from higher-pressure region, thus while directly An only main pump is left and right running motor fuel feeding after line travel control valve is opened, but the main pump also can not be again when loading different It is equally left and right running motor fuel feeding, but more liquid can be provided to smaller, the smaller side of pressure running motor is loaded Force feed, and then cause excavator can not keep straight line moving.And because the working environment of excavator is generally complicated and severe, dig Pick machine it is actual walking when or so running motor by identical load probability very little, or even usual two lateral load can difference it is larger, For example during the inclination of excavator vehicle, the load that the crawler belt of the relatively low side of level height is subject to is significantly larger than the higher side of level height Crawler belt, the hydraulic oil that single pump is provided flows to the motor of the higher side crawler belt of level height mostly, now using straight line moving The result of valve is excavator to low crawler belt side sideslip or even turned that this is not only unable to reach control excavator and keeps straight line moving Purpose, or even can also influence construction safety on the contrary.
For the above mentioned problem present in straight line moving control valve, a kind of current solution method is to use electrical control side Case, the flow using electrical equipment collection into left and right running motor, and control its flow equal to realize directly by controller Line is walked, such as Patent No. CN102888873A patent utilization flow sensor gathers into left and right running motor respectively Flow, flow signal is then passed into traveling controller, flow signal is analyzed by traveling controller, exported The output pressure for the electro liquid proportion pressure valve that signal control is set up, to adjust the aperture of travel motor control valve, make to enter left and right The flow of running motor is equal to realize purpose.
However, this scheme using electrical control, which needs to increase in systems, sets various electrical equipments, cost is higher, By taking CN102888873A patent as an example, system needs to set up six flow sensors, two traveling controllers, four unidirectional electricity Liquid proportional pressure-control valve and a pressure switch, cost is more than ten thousand yuan.The system of being additionally, since introduces more electric member Part, and in being connected in series so that the reliability of system in itself reduces, especially operation frequently, load switching is faster digs Mechanical field is dug, the electrical system for setting cascaded structure to connect, whole aircraft reliability can be made relatively worse.In addition, based on setting up The characteristics of electrical equipment, unidirectional Electric-hydraulic proportional pressure control valve are arranged in banked direction control valves guide's oil circuit, and traveling controller is arranged on In driver's cabin, flow sensor is arranged in the crawler travel motor covering of left and right, relatively scattered due to being distributed, so pacifying during maintenance Inconvenience is unloaded in assembly and disassembly, in addition occur because in motor covering insufficient space with need the flow sensor of above-mentioned quantity is installed into The problem of driving frame is reequiped.
The content of the invention
It is an object of the invention to provide a kind of straight line moving control valve, straight line moving control system and excavator, incite somebody to action this The straight line moving control valve of invention is applied in the hydraulic system of the engineering machinery of straight line moving, engineering machinery can be made to exist The load of both sides running motor remains in that straight line moving when different, it is ensured that construction safety.
To achieve the above object, first aspect present invention provides a kind of straight line moving control valve, and it includes valve body, on valve body Provided with main control valve, the first external hydraulic fluid port, the second external hydraulic fluid port, the 3rd external hydraulic fluid port and the 4th external hydraulic fluid port, main control valve bag Include the first main oil inlet, the first main oil-out, the second main oil inlet, the second main oil-out, the first control valve pocket and the second control Valve pocket, wherein：Main control valve has the first spool position and the second spool position, the first control valve pocket and the second control valve pocket point The both ends of main control valve are not arranged at to control the main control valve to switch between the first spool position and the second spool position, When the pressure of first control valve pocket is more than the pressure of the second control valve pocket, main control valve is in the first spool position, first lead into Hydraulic fluid port connects with the first main oil-out and the second main oil inlet and the second main oil-out disconnect；The pressure of first control valve pocket is less than During the pressure of the second control valve pocket, main control valve is in the second spool position, and the second main oil inlet connects with the second main oil-out And the first main oil inlet and the first main oil-out disconnect；Also, the first external hydraulic fluid port passes through the first oil circuit and the first control valve pocket Connection, the second external hydraulic fluid port control valve pocket to be connected by the second oil circuit with second, and the 3rd external hydraulic fluid port passes through the 3rd oil circuit and the One control valve pocket connection, the 4th external hydraulic fluid port are connected by the 4th oil circuit with the second control valve pocket.
Alternatively, straight line moving control valve also includes the auxiliary controls being arranged on valve body, and auxiliary controls are used In the break-make for controlling the first oil circuit, the second oil circuit, the 3rd oil circuit and the 4th oil circuit.
Alternatively, auxiliary controls include the first auxiliary controls and the second auxiliary controls, the first auxiliary control Mechanism processed is used to control the break-make of the first oil circuit and the break-make of the second oil circuit, and the second auxiliary controls are used to control the 3rd oil The break-make of the break-make on road and the 4th oil circuit.
Alternatively, the first auxiliary controls enter including the first auxiliary spool, the first oil inlet, the first oil-out, second Hydraulic fluid port and the second oil-out, the first oil inlet of the first auxiliary controls connect with the first external hydraulic fluid port, the first auxiliary control Second oil inlet of mechanism connects with the second external hydraulic fluid port, the first oil-out of the first auxiliary controls and the first control valve pocket Connection, the second oil-out of the first auxiliary controls connect with the second control valve pocket, and the first auxiliary spool is used to control first Locate simultaneously between the first oil inlet and the first oil-out of auxiliary controls and between the second oil inlet and the second oil-out In connection and a kind of state in cut-off two states；And/or second auxiliary controls include the second auxiliary spool, first Oil inlet, the first oil-out, the second oil inlet and the second oil-out, outside the first oil inlet of the second auxiliary controls and the 3rd Oil-collecting hole connects, and the second oil inlet of the second auxiliary controls connects with the 4th external hydraulic fluid port, the second auxiliary controls First oil-out connects with the first control valve pocket, and the second oil-out of the second auxiliary controls connects with the second control valve pocket, Second auxiliary spool is used between the first oil inlet and the first oil-out of the second auxiliary controls of control and the second oil-feed Mouth is with being in a kind of state connected with cut-off two states simultaneously between the second oil-out.
Alternatively, the first auxiliary controls include the first oil passage control valve being arranged on the first oil circuit and are arranged at The second oil passage control valve on second oil circuit, wherein：First oil passage control valve includes the first valve element, oil inlet and oil-out, the One valve element be used for control the first oil passage control valve oil inlet whether connected with oil-out, the oil inlet of the first oil passage control valve with First external hydraulic fluid port connection, the oil-out of the first oil passage control valve connect with the first control valve pocket；Second oil passage control valve includes Second valve element, oil inlet and oil-out, the second valve element are used to control whether the oil inlet of the second oil passage control valve and oil-out connect Logical, the oil inlet of the second oil passage control valve connects with the second external hydraulic fluid port, the oil-out of the second oil passage control valve and the second control Valve pocket connects；And/or second auxiliary controls include the 3rd oil passage control valve that is arranged on the 3rd oil circuit and be arranged at The 4th oil passage control valve on 4th oil circuit, wherein：3rd oil passage control valve includes the 3rd valve element, oil inlet and oil-out, the Three valve elements be used for control the 3rd oil passage control valve oil inlet whether connected with oil-out, the oil inlet of the 3rd oil passage control valve with 3rd external hydraulic fluid port connection, the oil-out of the 3rd oil passage control valve connect with the first control valve pocket；4th oil passage control valve includes 4th valve element, oil inlet and oil-out, the 4th valve element are used to control whether the oil inlet of the 4th oil passage control valve and oil-out connect Logical, the oil inlet of the 4th oil passage control valve connects with the 4th external hydraulic fluid port, the oil-out of the 4th oil passage control valve and the second control Valve pocket connects.
Alternatively, the first auxiliary controls include the first oil passage control valve and the second oil passage control valve, and second is auxiliary Controlling organization is helped to include the 3rd oil passage control valve and the 4th oil passage control valve, wherein, the first external hydraulic fluid port and the 3rd external hydraulic fluid port First control valve pocket one end is arranged at, and the first external hydraulic fluid port and the 3rd external hydraulic fluid port are located at the both sides of main control valve；Outside second Oil-collecting hole and the 4th external hydraulic fluid port are arranged at second control valve pocket one end, and the second external hydraulic fluid port and the 4th external hydraulic fluid port are arranged at master The both sides of control valve, and the second external hydraulic fluid port and the first external hydraulic fluid port be located at main control valve the same side and the 4th external hydraulic fluid port with 3rd external hydraulic fluid port is located at the same side of main control valve.
Alternatively, auxiliary controls include the 3rd auxiliary controls and the 4th auxiliary controls, the 3rd auxiliary control Mechanism processed is used to control the break-make of the first oil circuit and the break-make of the 3rd oil circuit, and the 4th auxiliary controls are used to control the second oil The break-make of the break-make on road and the 4th oil circuit.
Alternatively, the 3rd auxiliary controls enter including the 3rd auxiliary spool, the first oil inlet, the first oil-out, second Hydraulic fluid port and the second oil-out, the first oil inlet of the 3rd auxiliary controls connect with the first external hydraulic fluid port, the 3rd auxiliary control Second oil inlet of mechanism connects with the 3rd external hydraulic fluid port, and the first oil-out and the second oil-out of the 3rd auxiliary controls are equal Connected with the first control valve pocket, the 3rd auxiliary spool is fuel-displaced for the first oil inlet and first for controlling the 3rd auxiliary controls A kind of state connected with cut-off two states is between mouthful and simultaneously between second oil inlet and the second oil-out； And/or the 4th auxiliary controls include the 4th auxiliary spool, the first oil inlet, the first oil-out, the second oil inlet and second Oil-out, the first oil inlet of the 4th auxiliary controls connect with the second external hydraulic fluid port, and the second of the 4th auxiliary controls Oil inlet connects with the 4th external hydraulic fluid port, and the first oil-out and the second oil-out of the 4th auxiliary controls control with second Valve pocket connect, the 4th auxiliary spool be used for control the 4th auxiliary controls the first oil inlet and the first oil-out between and A kind of state connected with cut-off two states is between second oil inlet and the second oil-out simultaneously.
Alternatively, auxiliary controls control the first oil circuit, the second oil circuit, the 3rd oil circuit and the 4th oil circuit synchronization break-make.
Alternatively, auxiliary controls have operating position and rest position, when auxiliary controls are in operating position For controlling the first oil circuit, the second oil circuit, the 3rd oil circuit and the 4th oil circuit to be in connected state, auxiliary controls are in cut-off It is used to control the first oil circuit, the second oil circuit, the 3rd oil circuit and the 4th oil circuit to be off during position, straight line moving control valve Also include the control port being arranged on valve body, control port is used to control auxiliary controls in operating position and rest position Between switch.
Second aspect of the present invention provides a kind of straight line moving control system, for controlling engineering machinery to keep straight line moving, Straight line moving control system includes left running motor, left travel motor control valve, right running motor and right travel motor control valve, Wherein：
First flow-pressure difference conversion device is provided with the advance oil-feed oil circuit of left running motor, in right running motor Advance oil-feed oil circuit is provided with second flow-pressure difference conversion device, the pressure of the inlet and outlet of first flow-pressure difference reforming unit Power is poor with the flow positive correlation of the advance oil-feed oil circuit of left running motor, the inlet and outlet of second flow-pressure difference conversion device Pressure differential and right running motor advance oil-feed oil circuit flow positive correlation, straight line moving control system also includes first straight line Travel control valve, first straight line travel control valve are any of the above straight line moving control valve, the of first straight line travel control valve The inlet communication of one external hydraulic fluid port and first flow-pressure difference reforming unit, the second external hydraulic fluid port of first straight line travel control valve With the outlet of first flow-pressure difference reforming unit, the 3rd external hydraulic fluid port of first straight line travel control valve and second flow- The outlet of pressure difference reforming unit, the 4th external hydraulic fluid port and the second flow-pressure difference conversion of first straight line travel control valve fill The inlet communication put, the first main oil inlet of the main control valve of first straight line travel control valve with before left travel motor control valve Enter the connection of guide's hydraulic fluid port, the second main oil inlet and the right travel motor control valve of the main control valve of first straight line travel control valve Advance guide hydraulic fluid port connects, the first main oil-out and the second main oil-out of the main control valve of first straight line travel control valve with Fuel tank connects；And/or
The 3rd flow-pressure differential conversion equipment is provided with the retrogressing oil-feed oil circuit of left running motor, in right running motor Retreat oil-feed oil circuit and be provided with the 4th flow-pressure differential conversion equipment, the pressure of the inlet and outlet of the 3rd flow-pressure differential reforming unit The flow positive correlation of the poor retrogressing oil-feed oil circuit with left running motor of power, the inlet and outlet of the 4th flow-pressure differential conversion equipment Pressure differential and right running motor retrogressing oil-feed oil circuit flow positive correlation, straight line moving control system also includes second straight line Travel control valve, second straight line travel control valve are any of the above straight line moving control valve, the of second straight line travel control valve The inlet communication of one external hydraulic fluid port and the 3rd flow-pressure differential reforming unit, the second external hydraulic fluid port of second straight line travel control valve With the outlet of the 3rd flow-pressure differential reforming unit, the 3rd external hydraulic fluid port of second straight line travel control valve and the 4th flow- The outlet of pressure difference reforming unit, the 4th external hydraulic fluid port of second straight line travel control valve and the conversion of the 4th flow-pressure differential fill The inlet communication put, the first main oil inlet of the main control valve of second straight line travel control valve with after left travel motor control valve Move back the connection of guide's hydraulic fluid port, the second main oil inlet and the right travel motor control valve of the main control valve of second straight line travel control valve Retreat the connection of guide hydraulic fluid port, the first main oil-out and the second main oil-out of the main control valve of second straight line travel control valve with Fuel tank connects.
Alternatively, first flow-pressure difference reforming unit includes throttling arrangement, and/or second flow-pressure difference reforming unit bag Throttling arrangement is included, and/or the 3rd flow-pressure differential reforming unit includes throttling arrangement, and/or the 4th flow-pressure differential reforming unit Including throttling arrangement.
Alternatively, throttling arrangement includes choke valve.
Alternatively, straight line moving control valve includes auxiliary controls, and auxiliary controls have operating position and cut-off Position, auxiliary controls are used to control at the first oil circuit, the second oil circuit, the 3rd oil circuit and the 4th oil circuit when being in operating position In connected state, auxiliary controls are used to control the first oil circuit, the second oil circuit, the 3rd oil circuit and the 4th when being in rest position Oil circuit is off, and straight line moving control valve also includes the control port being arranged on valve body, and control port is used to control Auxiliary controls switch between operating position and rest position, and straight line moving control system includes pioneer pump, pioneer pump Outlet is connected with control port.
Alternatively, straight line moving system includes straight travel valve, guide's hydraulic fluid port of straight travel valve and the outlet of pioneer pump Connect and guide's hydraulic fluid port of straight travel valve connects with control port.
Alternatively, straight line moving system includes switch valve, and switch valve is used for outlet and the straight travel valve for controlling pioneer pump Guide's hydraulic fluid port and control port synchronous break-make.
Third aspect present invention also provides a kind of excavator, and it includes such as any of the above straight line moving control system.
Based on straight line moving control valve provided by the present invention and straight line moving control system, in engineering machinery such as excavators In the case of performing walking composite move, left and right running motor load difference, straight line moving control valve of the invention being capable of foundation The actual conditions of left and right running motor load adjust distribution of the main pump flow between the running motor of left and right in real time, make to enter left and right The flow of running motor tends to be equal, it is ensured that engineering machinery has good straight line moving performance, and sideslip of walking will not occur Phenomenon, so as to effectively overcome existing straight travel valve could to meet straight line moving requirement when both sides walking load is identical Limitation, and multiple electrical equipments with being connected in the prior art by being set in hydraulic circuit realize straight line moving Scheme is compared, and cost of the invention is relatively low, simple in construction, easy to manufacture, easy installation and removal, and reliability is higher.
By referring to the drawings to the present invention exemplary embodiment detailed description, further feature of the invention and its Advantage will be made apparent from.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 shows the hydraulic schematic diagram of the straight line moving control system of one embodiment of the invention.
Fig. 2 shows the hydraulic schematic diagram of the straight line moving control valve of one embodiment of the invention.
Fig. 3 shows the front view of straight line moving control valve shown in Fig. 2.
Fig. 4 shows the top view of straight line moving control valve shown in Fig. 2.
Fig. 5 shows the right view of straight line moving control valve shown in Fig. 2.
Fig. 6 shows the rearview of straight line moving control valve shown in Fig. 2.
Fig. 7 shows the upward view of straight line moving control valve shown in Fig. 2.
Fig. 8 shows the left view of straight line moving control valve shown in Fig. 2.
Fig. 9 shows Fig. 3 A-A profiles.
Figure 10 shows Fig. 4 B-B profiles.
Figure 11 shows Fig. 5 C-C profiles.
In figure：
1st, straight line moving control valve；10th, valve body；100th, the first connection oil duct；101st, the second connection oil duct；102nd, the 3rd connects Oil canal；103rd, the 4th connection oil duct；104th, the 5th connection oil duct；105th, the 6th connection oil duct；106th, the 7th connection oil duct； 107th, eight connectivity oil duct；11st, control bound；110th, primary control spool；111st, first end spring；112nd, first end plug； 113rd, the second end spring；114th, the second end plug；12nd, the first oil passage control valve；120th, the first valve element；121st, the first spring； 122nd, the first plug；13rd, the second oil passage control valve；130th, the second valve element；131st, second spring；132nd, the second plug；14th, the 3rd Oil passage control valve；140th, the 3rd valve element；141st, the 3rd spring；142nd, the 3rd plug；15th, the 4th oil passage control valve；150th, the 4th Valve element；151st, the 4th spring；152nd, the 4th plug；
2nd, left running motor；20th, left travel motor control valve；21st, first throttle valve；22nd, the 3rd choke valve；
3rd, right running motor；30th, right travel motor control valve；31st, second throttle；32nd, the 4th choke valve；
4th, rotary motor；40th, rotary motor control valve；
5th, straight travel valve；6th, switch valve；
P1, the first main pump；P2, the second main pump；P3, pioneer pump；
A, the first external import；B, the second external hydraulic fluid port；C, the 3rd external hydraulic fluid port；D, the 4th external hydraulic fluid port；G, the first master Oil inlet；E, the first main oil-out；H, the second main oil inlet；F, the second main oil-out.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In the description of the invention, it is to be understood that limit parts using the word such as " first ", " second ", only It is for only for ease of and corresponding parts is distinguished, does not such as have Stated otherwise, above-mentioned word does not have particular meaning, therefore not It is understood that as limiting the scope of the invention.
In order to which the structure of the straight line moving control valve of the present embodiment is explicitly described, in describing below, upper and lower, left and right, Forward and backward orientation is defined by the up, down, left, right, before and after orientation shown in Fig. 3.
First aspect present invention provides a kind of straight line moving control valve.Fig. 2 is the straight line moving of one embodiment of the invention The hydraulic schematic diagram of control valve, Fig. 3-Figure 11 are then the structural representation of straight line moving control valve shown in Fig. 2.Can by Fig. 2-Figure 11 Know, straight line moving control valve 1 provided by the present invention, it includes valve body 10, and main control valve 11, first is provided with the valve body 10 External hydraulic fluid port a, the second external hydraulic fluid port b, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th, main control valve 11 include the first main oil-feed Mouth g, the first main oil-out e, the second main oil inlet h, the second main oil-out f, the first control valve pocket and the second control valve pocket, its In：Main control valve 11 has the first spool position and the second spool position, and the first control valve pocket and the second control valve pocket are set respectively The both ends of main control valve 11 are placed in control main control valve 11 to switch between the first spool position and the second spool position, first When controlling the pressure of valve pocket to be more than the pressure of the second control valve pocket, main control valve 11 is in the first spool position, the first main oil-feed Mouth g connects with the first main oil-out e and the second main main oil-out f of oil inlet h and second disconnect；The pressure of first control valve pocket is small When the pressure of the second control valve pocket, main control valve 11 is in the second spool position, the second main main oil-outs of oil inlet h and second F is connected and the first main main oil-out e of oil inlet g and first disconnect；Also, the first external hydraulic fluid port a passes through the first oil circuit and first Valve pocket connection is controlled, the second external hydraulic fluid port b controls valve pocket to be connected by the second oil circuit with second, and the 3rd external hydraulic fluid port c passes through the Three oil circuits are connected with the first control valve pocket, and the 4th external hydraulic fluid port d is connected by the 4th oil circuit with the second control valve pocket.
Straight line moving control valve 1 provided by the present invention, it includes main control valve 11 and four external hydraulic fluid ports, wherein first The external external hydraulic fluid port c of hydraulic fluid port a and the 3rd are connected to the first control valve pocket of main control valve 11, outside the second external hydraulic fluid port b and the 4th Oil-collecting hole d is connected to the second control valve pocket of main control valve 11, the so pressure as the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd When power sum and the second external external hydraulic fluid port d of hydraulic fluid port b and the 4th pressure sum are unequal, main control valve 11 will its first Switch between spool position and the second spool position, realize the first main main oil-out e's of oil inlet g and first of main control valve 11 Connection or the second main main oil-out f of oil inlet h and second connection, it is seen then that straight line moving control valve provided by the present invention 1, it can be by comparing the pressure differential between the first external external hydraulic fluid port b of hydraulic fluid port a and second and the 4th external hydraulic fluid port d and the 3rd The size of pressure differential between external hydraulic fluid port c makes the main control valve 11 be in different on off operating modes.
Therefore, the straight line moving control valve 1 is applied in the hydraulic system of the engineering machinery such as excavator, then the linear rows Control valve 1 is walked by the existing comparison to the magnitude of pressure differential on the running motor oil-feed oil circuit of left and right of four external oil collecting causes for gossip to enter And the running motor for flowing through the larger side of pressure difference can be reduced to control main control valve 11 to be in by the pressure difference comparative result The spool position of hydraulic fluid flow rate, so as to adjust flow through both sides running motor hydraulic fluid flow rate it is equal so that the work such as excavator Journey machinery even in both sides running motor load it is different, even load difference it is larger when be maintained to straight line moving, have Effect overcomes existing straight travel valve could to meet the limitation of straight line moving requirement when both sides walking load is identical, improves Working security.
Further, straight line moving control valve 1 can also include the auxiliary controls being arranged on valve body 10, the auxiliary Controlling organization has an operating position and rest position, and auxiliary controls are used to controlling the first oil circuit, the when being in operating position Two oil circuits, the 3rd oil circuit and the 4th oil circuit are in connected state, are then used to controlling the when auxiliary controls are in rest position One oil circuit, the second oil circuit, the 3rd oil circuit and the 4th oil circuit are off.Therefore, can be controlled by auxiliary controls Outside the break-make relation and second for making the first control valve pocket of the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd and main control valve 11 The external hydraulic fluid port d of oil-collecting hole b and the 4th and the second control valve pocket of main control valve 11 break-make relation, and then cause main control valve 11 Only just it is used to compare magnitude of pressure differential when needed.
As a kind of embodiment of auxiliary controls, auxiliary controls can include the first auxiliary controls and Second auxiliary controls, wherein, the first auxiliary controls are used for the break-make of the first oil circuit of control and leading to for the second oil circuit It is disconnected, and the second auxiliary controls are then used to control the break-make of the 3rd oil circuit and the break-make of the 4th oil circuit.
As the another embodiment of auxiliary controls, auxiliary controls can also include the 3rd auxiliary control machine Structure and the 4th auxiliary controls, wherein, the 3rd auxiliary controls are used for the break-make and the 3rd oil circuit for controlling the first oil circuit Break-make, and the 4th auxiliary controls then be used for control the second oil circuit break-make and the 4th oil circuit break-make.
Specifically, the first auxiliary controls can include the first auxiliary spool, the first oil inlet, the first oil-out, the Two oil inlets and the second oil-out, wherein, the first oil inlet of the first auxiliary controls connects with the first external hydraulic fluid port a, the Second oil inlet of one auxiliary controls connects with the second external hydraulic fluid port b, the first oil-out of the first auxiliary controls with First control valve pocket connection, the second oil-out of the first auxiliary controls connect with the second control valve pocket, the first auxiliary spool Between the first oil inlet and the first oil-out for controlling the first auxiliary controls and the second oil inlet and second fuel-displaced Simultaneously in connection and a kind of state in cut-off two states between mouthful.Now, the first auxiliary controls can only include One valve, the break-make of the first oil circuit and the second oil circuit is controlled using this valve, such as this valve can be two-position four-way valve.
Or first auxiliary controls can also include being arranged at the first oil passage control valve 12 on the first oil circuit and The second oil passage control valve 13 being arranged on the second oil circuit.Wherein, the first oil passage control valve 12 includes the first valve element 120, oil-feed Mouth and oil-out, the first valve element 120 are used to control whether the oil inlet of the first oil passage control valve 12 connects with oil-out, the first oil The oil inlet of road control valve 12 connects with the first external hydraulic fluid port a, the oil-out of the first oil passage control valve 12 then with the first control valve Chamber connects；Second oil passage control valve 13 includes the second valve element 130, oil inlet and oil-out, and the second valve element 130 is used to control second Whether the oil inlet of oil passage control valve 13 connects with oil-out, the oil inlet of the second oil passage control valve 13 and the second external hydraulic fluid port b Connection, the oil-out of the second oil passage control valve 13 then connect with the second control valve pocket.Now, the first auxiliary body includes two Valve, the two valves control the break-make of the first oil circuit and the second oil circuit, such as the first oil passage control valve 12 and/or the second oil circuit respectively Control valve 13 can be two position two-way valve.
Specifically, the second auxiliary controls can include the second auxiliary spool, the first oil inlet, the first oil-out, the Two oil inlets and the second oil-out, the first oil inlet of the second auxiliary controls connect with the 3rd external hydraulic fluid port c, the second auxiliary Second oil inlet of controlling organization connects with the 4th external hydraulic fluid port d, the first oil-out of the second auxiliary controls and the first control Valve pocket connection processed, the second oil-out of the second auxiliary controls then connect with the second control valve pocket, and the second auxiliary spool is used for Control between the first oil inlet of the second auxiliary controls and the first oil-out and the second oil inlet and the second oil-out it Between simultaneously in connection with cut-off two states in a kind of state.Now, the first auxiliary controls can only include one Valve, the break-make of the 3rd oil circuit and the 4th oil circuit is controlled using this valve, such as this valve can be two-position four-way valve.
Or second auxiliary controls can also include being arranged at the 3rd oil passage control valve 14 on the 3rd oil circuit and The 4th oil passage control valve 15 being arranged on the 4th oil circuit.Wherein, the 3rd oil passage control valve 14 includes the 3rd valve element 140, oil-feed Mouth and oil-out, the 3rd valve element 140 are used to control whether the oil inlet of the 3rd oil passage control valve 14 connects with oil-out, the 3rd oil The oil inlet of road control valve 14 connects with the 3rd external hydraulic fluid port c, the oil-out of the 3rd oil passage control valve 14 and the first control valve pocket Connection；4th oil passage control valve 15 includes the 4th valve element 150, oil inlet and oil-out, and the 4th valve element 150 is used to control the 4th oil Whether the oil inlet of road control valve 15 connects with oil-out, and the oil inlet of the 4th oil passage control valve 15 and the 4th external hydraulic fluid port d connect Logical, the oil-out of the 4th oil passage control valve 15 connects with the second control valve pocket.Now, the first auxiliary body includes two valves, this Two valves control the break-make of the 3rd oil circuit and the 4th oil circuit, such as the 3rd oil passage control valve 14 and/or the control of the 4th oil circuit respectively Valve 15 can be two position two-way valve.
Specifically, the 3rd auxiliary controls can include the 3rd auxiliary spool, the first oil inlet, the first oil-out, the Two oil inlets and the second oil-out, wherein, the first oil inlet of the 3rd auxiliary controls connects with the first external hydraulic fluid port a, the Second oil inlet of three auxiliary controls connects with the 3rd external hydraulic fluid port c, the first oil-out of the 3rd auxiliary controls and Second oil-out connects with the first control valve pocket, and the 3rd auxiliary spool is used for the first oil-feed for controlling the 3rd auxiliary controls Mouth is connected with ending in two states with being between the second oil inlet and the second oil-out between the first oil-out and simultaneously A kind of state.Now, the 3rd auxiliary controls can only include a valve, using this valve come control the first oil circuit and The break-make of 3rd oil circuit, such as this valve can be two-position four-way valve.
Specifically, the 4th auxiliary controls can include the 4th auxiliary spool, the first oil inlet, the first oil-out, the Two oil inlets and the second oil-out, the first oil inlet of the 4th auxiliary controls connect with the second external hydraulic fluid port b, the 4th auxiliary Second oil inlet of controlling organization connects with the 4th external hydraulic fluid port d, and the first oil-out of the 4th auxiliary controls and second goes out Hydraulic fluid port connect with the second control valve pocket, and the 4th auxiliary spool is used for the first oil inlet and the of the 4th auxiliary controls of control The one kind connected with cut-off two states is between one oil-out and simultaneously between second oil inlet and the second oil-out State.Now, the 4th auxiliary controls can only include a valve, and the second oil circuit and the 4th oil are controlled using this valve The break-make on road, such as this valve can be two-position four-way valve.
Next the present invention is described further with reference to the embodiment shown in Fig. 2-Figure 11.
As shown in figs. 2 and 10, in this embodiment, straight line moving control valve 1 includes the master control being arranged on valve body 10 Valve 11 processed, auxiliary controls, the first external hydraulic fluid port a, the second external hydraulic fluid port b, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th.
As shown in Figure 10, in this embodiment, main control valve 11 is three position four-way directional control valve, and the main control valve 11 includes master Control valve element 110, the first main oil inlet g, the first main oil-out e, the second main oil inlet h, the second main oil-out f, the first control Valve pocket and the second control valve pocket.
In this embodiment, primary control spool 110 is arranged in the main valve mounting hole of valve body 10, the first main oil inlet g, One main oil-out e, the second main main oil-out f of oil inlet h and second are arranged on the hole wall of main valve mounting hole both sides, the main valve Mounting hole through the left and right end face of valve body 10 and its be located at the postmedian of valve body 10 (postmedian herein refer to before valve body 10 It is closer to rear end face and then centrally located on the direction of upper and lower end face on rear end face direction).The of primary control spool 110 One end and the second end are blocked by the end plug 114 of first end plug 112 and second respectively, in first end plug 112 and master control First end spring 111 is provided between valve element 110 processed, the second end bullet is provided between the second end plug 114 and primary control spool 110 Spring 113, the end plug 114 of first end plug 112 and second compress main control by the end spring 113 of first end spring 111 and second Valve element 110 forms the first control valve pocket to realize centering, between first end plug 112 and the first end of primary control spool 110, the The second control valve pocket is formed between two end plugs 114 and the second end of main valve plug, when the first control valve pocket and the second control valve pocket During obstructed hydraulic oil, primary control spool 110 is then in middle position in the presence of the end spring 113 of first end spring 111 and second.
In this embodiment, main control valve 11 has the first spool position, the second spool position and middle rest position, when When primary control spool 110 moves in main valve mounting hole, main control valve 11 the first spool position, the second spool position and in Between switch between rest position, when main control valve 11 is in the first spool position, the first main main oil-outs of oil inlet g and first E is connected and the second main main oil-out f of oil inlet h and second disconnect；When main control valve 11 is in the second spool position, the second master Oil inlet h connects with the second main oil-out f and the first main main oil-out e of oil inlet g and first disconnect；And at main control valve 11 When middle rest position, the first main oil inlet g disconnects with the first main oil-out e and the second main oil inlet h and the second master are fuel-displaced Mouth f also disconnects.
As shown in Figure 10, in this embodiment, the first main oil inlet g, the first main oil-out e, the second main oil inlet h and Two main oil-out f are arranged on the middle part of main control valve 11 (during middle part herein refers on the left and right end face direction of valve body 10 Portion), and the first main main oil-out e of oil inlet g and first are closer to first control valve pocket one end and the second main oil inlet h and the Two main oil-out f are then closer to second control valve pocket one end, so when the pressure of the first logical hydraulic oil of control valve pocket institute is equal to the During two control valve pockets institute's pressure of logical hydraulic oil, primary control spool 110 is in an intermediate position, and main control valve 11 is in middle cut-off Position；When first control valve pocket institute logical hydraulic oil pressure be more than second control valve pocket logical hydraulic oil pressure when, main control Valve element 110 moves to right-hand member, and main control valve 11 is in the first spool position；And when first control valve pocket logical hydraulic oil pressure Less than the second logical hydraulic oil of control valve pocket institute pressure when, primary control spool 110 moves to left end, and main control valve 11 is in second Spool position.
In this embodiment, the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd are arranged at first control valve pocket one end, and The one external external hydraulic fluid port c of hydraulic fluid port a and the 3rd are located at the both sides of main control valve 11；Second external hydraulic fluid port b and the 4th external hydraulic fluid port d is set Second control valve pocket one end is placed in, the second external external hydraulic fluid port d of hydraulic fluid port b and the 4th are arranged at the both sides of main control valve 11, and The two external external hydraulic fluid port a of hydraulic fluid port b and first are located at the same side of main control valve 11 and the 4th external hydraulic fluid port d and the 3rd external hydraulic fluid port C is located at the same side of main control valve 11.It is such that the arrangement for being easy to oil circuit on valve body 10 is set, and also allow for follow-up this four The connection of external hydraulic fluid port and left and right running motor.Specifically, as shown in Fig. 4, Fig. 7 and Figure 10, outside the first external hydraulic fluid port a and second Oil-collecting hole b is arranged at the upper surface of valve body 10, and the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th are arranged at the lower surface of valve body 10, And be adapted with the set location of the first control valve pocket and the second control valve pocket, the first external external hydraulic fluid port b of hydraulic fluid port a and second exist Be distributed from left to right on the upper surface of valve body 10, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th on the lower surface of valve body 10 from From left to right is distributed.
In this embodiment, auxiliary controls include the first oil passage control valve 12, the oil of the second oil passage control valve the 13, the 3rd The oil passage control valve 15 of road control valve 14 and the 4th, wherein, the first oil passage control valve 12 is arranged on the controls of the first external hydraulic fluid port a and first On the first oil circuit between valve pocket processed, for controlling the break-make of the first oil circuit；It is external that second oil passage control valve 13 is arranged on second On the second oil circuit between the control valve pockets of hydraulic fluid port b and second, for controlling the break-make of the second oil circuit；3rd oil passage control valve 14 is set Put on the 3rd oil circuit between the control valve pockets of the 3rd external hydraulic fluid port c and first, for controlling the break-make of the 3rd oil circuit；4th oil Road control valve 15 is arranged on the 4th oil circuit between the control valve pockets of the 4th external hydraulic fluid port d and second, for controlling the 4th oil circuit Break-make.
In order to simplify oil circuit, in this embodiment, the first oil circuit is coaxially disposed with the second oil circuit, the 3rd oil circuit and the 4th oil Road is coaxially disposed.First oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and the 4th oil passage control valve 15 be two position two-way valve, and is separately positioned in the auxiliary valve installation hole of the corner of valve body 10, and respectively with the first external oil collecting Mouth a, the second external hydraulic fluid port b, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th set location are adapted.
As shown in Figure 10, the first oil passage control valve 12 includes the first valve element 120, oil inlet and oil-out, the first valve element 120 It is arranged in first auxiliary valve installation hole in the upper left corner of valve body 10, the oil inlet and oil-out of the first oil passage control valve 12 are then set Put on the hole wall of the first auxiliary valve installation hole both sides, wherein, the oil inlet of the first oil passage control valve 12 and the first external hydraulic fluid port a Connection, the oil-out of the first oil passage control valve 12 connect with the first control valve pocket, and the first valve element 120 is used to control the first oil circuit control Whether the oil inlet of valve 12 processed connects with oil-out.
In Fig. 10, the left end of the first valve element 120 is blocked by the first plug 122, the first plug 122 and the first valve element The first spring 121 is provided between 120, the first plug 122 compresses the first valve element 120 by the first spring 121, therefore, first In the presence of spring 121, the first valve element 120 controls the oil inlet of the first oil passage control valve 12 and oil-out to disconnect during normal position, i.e., The first oil passage control valve 12 controls the control valve pockets of the first external hydraulic fluid port a and first to disconnect during normal position；And working as has active force to make first When valve element 120 commutates, the first valve element 120 controls the oil inlet of the first oil passage control valve 12 connect with oil-out, i.e., commutation when the One oil passage control valve 12 controls the first external hydraulic fluid port a to control valve pocket to connect with first, and the first external hydraulic fluid port a pressure then can be with Act on the first control valve pocket of main control valve 11.
As shown in Figure 10, the second oil passage control valve 13 includes the second valve element 130, oil inlet and oil-out, the second valve element 130 It is arranged in second auxiliary valve installation hole in the upper right corner of valve body 10, the oil inlet and oil-out of the second oil passage control valve 13 are then set Put on the hole wall of the second auxiliary valve installation hole both sides, wherein, the oil inlet of the second oil passage control valve 13 and the second external hydraulic fluid port b Connection, the oil-out of the second oil passage control valve 13 connect with the second control valve pocket, and the second valve element 130 is used to control the second oil circuit control Whether the oil inlet of valve 13 processed connects with oil-out.
In Fig. 10, the right-hand member of the second valve element 130 is blocked by the second plug 132, the second plug 132 and the second valve element Second spring 131 is provided between 130, the second plug 132 compresses the second valve element 130 by second spring 131, therefore, second In the presence of spring 131, the second valve element 130 controls the oil inlet of the second oil passage control valve 13 and oil-out to disconnect during normal position, i.e., The second oil passage control valve 13 controls the control valve pockets of the second external hydraulic fluid port b and second to disconnect during normal position；And working as has active force to make second When valve element 130 commutates, the second valve element 130 controls the oil inlet of the second oil passage control valve 13 connect with oil-out, i.e., commutation when the Two oil passage control valves 13 control the second external hydraulic fluid port b to control valve pocket to connect with second, and the second external hydraulic fluid port b pressure then can be with Act on the second control valve pocket of main control valve 11.
As shown in Figure 10, the 3rd oil passage control valve 14 includes the 3rd valve element 140, oil inlet and oil-out, the 3rd valve element 140 It is arranged in the 3rd auxiliary valve installation hole in the lower left corner of valve body 10, the oil inlet and oil-out of the 3rd oil passage control valve 14 are then set Put on the hole wall of the 3rd auxiliary valve installation hole both sides, wherein, the oil inlet of the 3rd oil passage control valve 14 and the 3rd external hydraulic fluid port c Connection, the oil-out of the 3rd oil passage control valve 14 connect with the first control valve pocket, and the 3rd valve element 140 is used to control the 3rd oil circuit control Whether the oil inlet of valve 14 processed connects with oil-out.
In Fig. 10, the left end of the 3rd valve element 140 is blocked by the 3rd plug 142, the 3rd plug 142 and the 3rd valve element The 3rd spring 141 is provided between 140, the 3rd plug 142 compresses the 3rd valve element 140 by the 3rd spring 141, therefore, the 3rd In the presence of spring 141, the 3rd valve element 140 controls the oil inlet of the 3rd oil passage control valve 14 and oil-out to disconnect during normal position, i.e., The 3rd oil passage control valve 14 controls the control valve pockets of the 3rd external hydraulic fluid port c and first to disconnect during normal position；And working as has active force to make the 3rd When valve element 140 commutates, the 3rd valve element 140 controls the oil inlet of the 3rd oil passage control valve 14 connect with oil-out, i.e., transposition when the Three oil passage control valves 14 control the 3rd external hydraulic fluid port c to control valve pocket to connect with first, and the 3rd external hydraulic fluid port c pressure then can be with Act on the first control valve pocket of main control valve 11.
As shown in Figure 10, the 4th oil passage control valve 15 includes the 4th valve element 150, oil inlet and oil-out, the 4th valve element 150 It is arranged in the 4th auxiliary valve installation hole in the lower right corner of valve body 10, the oil inlet and oil-out of the 4th oil passage control valve 15 are then set Put on the hole wall of the 4th auxiliary valve installation hole both sides, wherein, the oil inlet of the 4th oil passage control valve 15 and the 4th external hydraulic fluid port d Connection, the oil-out of the 4th oil passage control valve 15 connect with the second control valve pocket, and the 4th valve element 150 is used to control the 4th oil circuit control Whether the oil inlet of valve 15 processed connects with oil-out.
In Fig. 10, the right-hand member of the 4th valve element 150 is blocked by the 4th plug 152, the 4th plug 152 and the 4th valve element The 4th spring 151 is provided between 150, the 4th plug 152 compresses the 4th valve element 150 by the 4th spring 151, therefore, the 4th In the presence of spring 151, the 4th valve element 150 controls the oil inlet of the 4th oil passage control valve 15 and oil-out to disconnect during normal position, i.e., The 4th oil passage control valve 15 controls the control valve pockets of the 4th external hydraulic fluid port d and second to disconnect during normal position；And working as has active force to make the 4th When valve element 150 commutates, the 4th valve element 150 controls the oil inlet of the 4th oil passage control valve 15 connect with oil-out, i.e., commutation when the Four oil passage control valves 15 control the 4th external hydraulic fluid port d to control valve pocket to connect with second, and the 4th external hydraulic fluid port d pressure then can be with Act on the second control valve pocket of main control valve 11.
It can be seen that when no active force makes the first valve element 120, the second valve element 130, the 3rd valve element 140 and the 4th valve element 150 During commutation, the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and the 4th oil passage control valve 15 are equal In rest position, the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd pressure does not act on the first control valve of main control valve Chamber, the second external external hydraulic fluid port d of hydraulic fluid port b and the 4th pressure do not act on the second control valve pocket of main control valve, main control yet Valve element 110 is then in middle rest position, main control valve 11 in the presence of the end spring 113 of first end spring 111 and second Two pairs of oil inlet and outlets do not connect；When there is active force to make the first valve element 120, the second valve element 130, the 3rd valve element 140 and When four valve elements 150 commutate, the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and the 4th oil circuit Control valve 15 is in operating position, and the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd pressure then acts on main control valve 11 The first control valve pocket, the second external external hydraulic fluid port d of hydraulic fluid port b and the 4th pressure acts on the second control of main control valve 11 simultaneously Valve pocket processed, when the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd pressure sum is more than the second external hydraulic fluid port b and the 4th external oil collecting During mouthful d pressure sum, main control valve 11 be in the first spool position, the first main main oil-out e of oil inlet g and first connect and The second main main oil-out f of oil inlet h and second disconnect, and when the first external external hydraulic fluid port c of hydraulic fluid port a and the 3rd pressure sum is small When the second external external hydraulic fluid port d of hydraulic fluid port b and the 4th pressure sum, main control valve 11 is in the second spool position, the second master The main oil-out f connections of oil inlet h and second and the first main main oil-out e disconnections of oil inlet g and first.
Further, as shown in figure 3, in this embodiment, control port K is additionally provided with valve body 10, control port K can Commutation for the first valve element 120, the second valve element 130, the 3rd valve element 140 and the 4th valve element 150 provides active force, so as to control System includes the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and the 4th oil passage control valve 15 Auxiliary controls switch between operating position and rest position.
As shown in Figure 2, control port K and the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 are connected with the non-spring one end of the 4th oil passage control valve 15, and this is allowed for when control port K leads to oily, and hydraulic oil can reach First oil passage control valve 12, the second oil passage control valve 13, the non-spring of the 3rd oil passage control valve 14 and the 4th oil passage control valve 15 One end, when the pressure of the hydraulic oil is more than the bullet of the first spring 121, second spring 131, the 3rd spring 141 and the 4th spring 151 During power, the first valve element 120, the second valve element 130, the 3rd valve element 140 and the 4th valve element 150 are then able to overcome the bullet of respective spring Power commutates to operating position.It can be seen that by setting control port K so that auxiliary controls can control the first oil circuit, The synchronous break-make of two oil circuits, the 3rd oil circuit and the 4th oil circuit.
Specifically, control port K can be connected to aforementioned four by the oil duct interconnected being arranged on valve body 10 The non-spring one end of oil passage control valve, as shown in Fig. 3-Figure 11, these oil ducts interconnected can include the first connection oil duct 100th, the second connection oil duct 101, third connecting oil duct the 102, the 4th connect oil duct the 103, the 5th and connect the connection of oil duct the 104, the 6th Oil duct the 105, the 7th connects oil duct 106 and eight connectivity oil duct 107, wherein：
As shown in Figure 3 and Figure 9, control port K is arranged at the left portion of the front end face of valve body 10, the first connection oil duct 100 Extend to the non-spring one end of the first oil passage control valve 12 by the upper left quarter of the front end face of valve body 10, the second connection oil duct 101 by The upper right quarter of the front end face of valve body 10 extends to the non-spring one end of the second oil passage control valve 13, and third connecting oil duct 102 is by valve The lower left quarter of the front end face of body 10 extends to the non-spring one end of the 3rd oil passage control valve 14, and the 4th connection oil duct 103 is by valve body The right lower quadrant of 10 front end face extends to the non-spring one end of the 4th oil passage control valve 15, and the first connection oil duct 100 and second connects Oil canal 101 is arranged at sustained height, and third connecting oil duct 102 connects oil duct 103 with the 4th and is arranged at sustained height；
As shown in figs. 4 and 7, the 7th connection oil duct 106 extends to valve body 10 by the left front portion of the upper surface of valve body 10 Lower surface, eight connectivity oil duct 107 are extended to the lower surface of valve body 10, the 7th connection oil by the right front portion of the upper surface of valve body 10 Road 106 and eight connectivity oil duct 107 are located at the first external external hydraulic fluid port b's of hydraulic fluid port a and second in the port of the upper surface of valve body 10 Front, and as shown in figure 9, the 7th connection oil duct 106 from top to bottom connects with first oil duct 100, control port K and the successively Tee joint oil duct 102 is intersecting, then control port K i.e. can by the 7th connection oil duct 106 with first connect oil duct 100 and Third connecting oil duct 102 connects, and so when control port K leads to oily, hydraulic oil can just pass through the 7th connection oil duct 106 and the One connection oil duct 100 reaches the non-spring one end of the first oil passage control valve 12, and the first oil passage control valve 12 of driving commutates, while liquid Force feed can reach the non-spring one end of the 3rd oil passage control valve 14 by the 7th connection oil duct 106 and third connecting oil duct 102, The 3rd oil passage control valve 14 is driven to commutate；
As shown in Figure 5 and Figure 8, the 5th connection oil duct 104 extends to valve body 10 by the upper front part of the right side of valve body 10 Left side, the 6th connection oil duct 105 extends to the left side of valve body 10 by the lower front portion of the right side of valve body 10, and as schemed Shown in 9 and Figure 11, the 5th connection oil duct 104 connects oil duct 106 and first with the 7th and connects oil duct 100 and eight connectivity simultaneously Oil duct 107 connects oil duct 101 with second and intersected, and the 6th connection oil duct 105 connects oil duct 106 and third connecting oil with the 7th simultaneously Road 102 and eight connectivity oil duct 107 connect oil duct 103 with the 4th and intersected, therefore, when control port K leads to oily, hydraulic oil energy Enough pass sequentially through the 7th connection oil duct 106, first and connect oil duct the 100, the 5th and connect oil duct 104 and connect oil duct 101 with second and arrive Up to the non-spring one end of the second oil passage control valve 13, the second oil passage control valve 13 of control commutates, while hydraulic oil can be by the Seven connection oil ducts 106, third connecting oil duct the 102, the 6th connect oil duct 105 and connect the 4th oil circuit control of arrival of oil duct 103 with the 4th The non-spring one end of valve 15 processed, the 4th oil passage control valve 15 of control commutate.
The present invention according to as above position relationship set control port K, the first connection oil duct 100, second connect oil duct 101, Third connecting oil duct the 102, the 4th connects oil duct the 103, the 5th and connects the connection connection oil duct of oil duct the 105, the 7th of oil duct the 104, the 6th 106 and eight connectivity oil duct 107, it is advantageous in that, can arrange the oil circuit on valve body 10 simpler, and can reduce plus Work difficulty.Moreover, in fact, the present invention can also be not provided with eight connectivity oil duct 107, remain able to realize control port K with The connection of the non-spring one end of four oil passage control valves, makes oil circuit simpler.
In order to ensure the sealing of straight line moving control valve, as shown in figures 9 and 11, above-mentioned first connect oil duct 100, Second connection oil duct 101, third connecting oil duct the 102, the 4th connect oil duct the 103, the 5th and connect the connection oil duct of oil duct the 104, the 6th 105th, the end face opening of the 7th connection oil duct 106 and eight connectivity oil duct 107 is respectively provided with auxetic plug and blocked, in order to avoid liquid The end face opening pressed oil in these connection oil ducts is revealed.
In the above-described embodiments, control auxiliary controls using hydraulic control mode based on control port K four of the invention Oil passage control valve is commutated, in fact, the present invention can also use automatically controlled other control modes of grade, the embodiment is based on control Hydraulic fluid port K is advantageous in that using hydraulic control mode can reduce cost, improve the functional reliability of straight line moving control valve 1.
Second aspect of the present invention provides a kind of straight line moving control system.Fig. 1 shows the straight of one embodiment of the invention The hydraulic schematic diagram of line traveling control system.Reference picture 1, straight line moving control system of the invention are used to control engineering machinery to protect Straight line moving is held, it includes left running motor 2, left travel motor control valve 20, right running motor 3 and right travel motor control valve 30, wherein：
First flow-pressure difference conversion device is provided with the advance oil-feed oil circuit of left running motor 2, in right running motor 3 Advance oil-feed oil circuit be provided with second flow-pressure difference conversion device, the inlet and outlet of first flow-pressure difference reforming unit The flow positive correlation of the advance oil-feed oil circuit of pressure differential and left running motor 2, the import of second flow-pressure difference conversion device and goes out The pressure differential of mouth and the flow positive correlation of the advance oil-feed oil circuit of right running motor 3, and straight line moving control system also includes First straight line travel control valve, the first straight line travel control valve be any of the above embodiment straight line moving control valve 1, first First external hydraulic fluid port a of straight line moving control valve and the inlet communication of first flow-pressure difference reforming unit, first straight line walking control Second external hydraulic fluid port b of valve processed and the outlet of first flow-pressure difference reforming unit, the 3rd of first straight line travel control valve the External hydraulic fluid port c and second flow-pressure difference reforming unit outlet, the 4th external hydraulic fluid port d of first straight line travel control valve With the inlet communication of second flow-pressure difference reforming unit, the first main oil-feed of the main control valve 11 of first straight line travel control valve Mouthful g connects with advance guide's hydraulic fluid port of left travel motor control valve 20, and the of the main control valve 11 of first straight line travel control valve Two main oil inlet h connect with advance guide's hydraulic fluid port of right travel motor control valve 30, the main control of first straight line travel control valve The first main main oil-out f of oil-out e and second of valve 11 connect with fuel tank；And/or
The 3rd flow-pressure differential conversion equipment is provided with the retrogressing oil-feed oil circuit of left running motor 2, in right running motor 3 Retrogressing oil-feed oil circuit be provided with the 4th flow-pressure differential conversion equipment, the inlet and outlet of the 3rd flow-pressure differential reforming unit The flow positive correlation of the retrogressing oil-feed oil circuit of pressure differential and left running motor 2, the import of the 4th flow-pressure differential conversion equipment and goes out The pressure differential of mouth and the flow positive correlation of the retrogressing oil-feed oil circuit of right running motor 3, and straight line moving control system also includes Second straight line travel control valve, the second straight line travel control valve be any of the above embodiment straight line moving control valve 1, second First external hydraulic fluid port a and the 3rd flow-pressure differential reforming unit of straight line moving control valve inlet communication, second straight line walking control Second external hydraulic fluid port b and the 3rd flow-pressure differential reforming unit of valve processed outlet, the 3rd of second straight line travel control valve the External hydraulic fluid port c and the 4th flow-pressure differential reforming unit outlet, the 4th external hydraulic fluid port d of second straight line travel control valve With the inlet communication of the 4th flow-pressure differential reforming unit, the first main oil-feed of the main control valve 11 of second straight line travel control valve Mouthful g connects with retrogressing guide's hydraulic fluid port of left travel motor control valve 20, and the of the main control valve 11 of second straight line travel control valve Two main oil inlet h connect with retrogressing guide's hydraulic fluid port of right travel motor control valve 30, the main control of second straight line travel control valve The first main main oil-out f of oil-out e and second of valve 11 connect with fuel tank.
Based on straight line moving control system provided by the present invention, because it includes the straight line moving control valve 1 of the present invention With the flow-pressure differential conversion equipment being arranged on the motor oil-feed oil circuit of both sides, the pressure of flow-pressure differential conversion equipment inlet and outlet The size for being sized to reflect the flow of running motor oil-feed oil circuit of power difference, four external hydraulic fluid ports of straight line moving control valve will The inlet and outlet pressure value of the flow-pressure differential conversion equipment of both sides feeds back to the main control valve 11 of straight line moving control valve 1 Two control ports are compared, and the walking of the larger side of flow is made by the displacement of the primary control spool 110 of main control valve 11 Guide's hydraulic fluid port pressure release of motor control valve, so as to turn down the valve port opening of the side travel motor control valve, balance both sides walking horse The flow reached, it is allowed to tend to be equal, to realize the purpose for controlling straight line moving.
Specifically, straight line moving control system provided by the present invention, by set first flow-pressure difference conversion device, Second flow-pressure difference conversion device and first straight line travel control valve, it can adjust two skiddings when engineering machinery is advanced The oil mass distribution of motor is walked, it is not influenceed by external world's load and always tends to be equal, so as to keep straight line moving；By setting The 3rd flow-pressure differential conversion equipment, the 4th traffic transformation device and second straight line travel control valve are put, it can be in engineering machine When tool retreats, the oil mass distribution of regulation both sides running motor, it is not influenceed by external world's load and always tend to be equal, so as to Keep straight line moving；And by setting first flow-pressure difference conversion device, second flow-pressure difference conversion device and first simultaneously Straight line moving control valve and the 3rd flow-pressure differential conversion equipment, the 4th traffic transformation device and second straight line travel control valve, Then it can be realized all makes engineering machinery keep straight line moving when engineering machinery is advanced or is retreated.
Set flow-pressure differential conversion equipment can include throttling arrangement, example in straight line moving control system of the present invention Other devices of such as choke valve or calibrating nozzle, as long as its inlet and outlet pressure difference size is proportionate i.e. with flowing through its uninterrupted Can.
The straight line moving control system of the present invention is further described with reference to embodiment illustrated in fig. 1.
As shown in figure 1, in this embodiment, straight line moving control system includes the first main pump P1, the second main pump P2, guide Pump P3, left running motor 2, left travel motor control valve 20, right running motor 3, right travel motor control valve 30, rotary motor 4, Rotary motor control valve 40, straight travel valve 5, switch valve 6, first straight line travel control valve, second straight line travel control valve, One choke valve 21, second throttle 31, the 3rd choke valve 22 and the 4th choke valve 32, wherein left travel motor control valve 20, the right side Travel motor control valve 30, rotary motor control valve 40, first straight line travel control valve and second straight line travel control valve adopt With Center-Open structure, 6 normal position of switch valve is in cut-off state.
As shown in Figure 1, in this embodiment, the first main pump P1, the second main pump P2 and pioneer pump P3 are driven by same motor M Dynamic, left travel motor control valve 20 is arranged on the first main pump P1 and on the connection oil circuit of left running motor 2, right running motor controls Valve 30 is arranged on straight travel valve 5 and on the connection oil circuit of right running motor 3, rotary motor control valve 40 is arranged on straight line moving On the connection oil circuit of valve 5 and rotary motor 4, the first main pump P1 outlet connects with an oil inlet of straight travel valve 5, and second Main pump P2 outlet connects with another oil inlet of straight travel valve 5, and guide's hydraulic fluid port of straight travel valve 5 passes through switch valve 6 It is connected to pioneer pump P3 outlet.
In this embodiment, first throttle valve 21 is arranged on the advance oil-feed oil circuit of left running motor 2, second throttle 31 are arranged on the advance oil-feed oil circuit of right running motor 3, and the 3rd choke valve 22 is arranged on the retrogressing oil-feed oil of left running motor Lu Shang, the 4th choke valve 32 are arranged on the retrogressing oil-feed oil circuit of right running motor 3, wherein, first throttle valve 21 and second saves Stream valve 31 can use mutually isostructural choke valve, and the 3rd choke valve 22 can also use mutually isostructural with the 4th choke valve 32 Choke valve, so it is more convenient for realizing the comparison to left and right running motor flow.
In this embodiment, first straight line travel control valve is arranged on the advance oil-feed oil circuit and right lateral of left running motor 2 Between the advance oil-feed oil circuit for walking motor 3, specifically, the first external hydraulic fluid port a and first throttle of first straight line travel control valve The inlet communication of valve 21, the second external hydraulic fluid port b of first straight line travel control valve and the outlet of first throttle valve 21, first 3rd external hydraulic fluid port c of straight line moving control valve and the outlet of second throttle 31, the of first straight line travel control valve The inlet communication of four external hydraulic fluid port d and second throttle 31, the first of the main control valve 11 of first straight line travel control valve lead into Hydraulic fluid port g connects with advance guide's hydraulic fluid port of left travel motor control valve 20, the main control valve 11 of first straight line travel control valve Second main oil inlet h connects with advance guide's hydraulic fluid port of right travel motor control valve 30, the master control of first straight line travel control valve The first main main oil-out f of oil-out e and second of valve 11 processed connect with fuel tank.
In this embodiment, second straight line travel control valve is arranged on the retrogressing oil-feed oil circuit and right lateral of left running motor 2 Between the retrogressing oil-feed oil circuit for walking motor 3, specifically, the throttlings of the first external hydraulic fluid port a of second straight line travel control valve and the 3rd The inlet communication of valve 22, the second external hydraulic fluid port b and the 3rd choke valve 22 of second straight line travel control valve outlet, second 3rd external hydraulic fluid port c and the 4th choke valve 32 of straight line moving control valve outlet, the of second straight line travel control valve Four external hydraulic fluid port d and the 4th choke valve 32 inlet communication, the first of the main control valve 11 of second straight line travel control valve lead into Hydraulic fluid port g connects with retrogressing guide's hydraulic fluid port of left travel motor control valve 20, the main control valve 11 of second straight line travel control valve Second main oil inlet h connects with retrogressing guide's hydraulic fluid port of right travel motor control valve 30, the master control of second straight line travel control valve The first main main oil-out f of oil-out e and second of valve 11 processed connect with fuel tank.
In this embodiment, first straight line travel control valve and second straight line travel control valve include auxiliary control machine Structure, and auxiliary controls include the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and the 4th Oil passage control valve 15, as shown in Figure 1, the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and Connection oil duct and straight line moving control valve 1 of the non-spring one end of four oil passage control valves 15 by being mutually communicated on valve body 10 Control port K is connected, and control port K is then connected to pioneer pump P3 outlet by switch valve 6, and such pioneer pump P3 just can be It is control port K fuel feeding when needing, with the break-make of the oil circuit of Synchronization Control first, the second oil circuit, the 3rd oil circuit and the 4th oil circuit.
In this embodiment, control port K connects with guide's hydraulic fluid port of straight travel valve 5 simultaneously, and straight travel valve 5 Guide's hydraulic fluid port also by switch valve 6 and pioneer pump P3 outlet, so setting is advantageous in that, switch valve 6 can be controlled The outlet of oil circuit and pioneer pump P3 between pioneer pump P3 processed outlet and control port K and the guide oil of straight travel valve 5 The synchronous break-make of oil circuit between mouthful, and then the first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil circuit can be controlled Control valve 14, the 4th oil passage control valve 15 realize synchronous communicating with straight travel valve 5.
Next the operation principle of the straight line moving control system of the embodiment is illustrated, it is specific as follows：
When engineering machinery does not have straight line moving demand, as shown in figure 1, switch valve 6 is in right position (ending position), this When, pioneer pump P3 can not be the guide oil confession oil of straight travel valve 5, and straight travel valve 5 is then in right position, therefore, first Main pump P1 is that the left fuel feeding of running motor 2 is simultaneously revolution horse by rotary motor control valve 40 by left travel motor control valve 20 Up to 4 fuel feeding, the second main pump P2 is then the right fuel feeding of running motor 3 by right travel motor control valve 30.
When engineering machinery needs straight line moving, as shown in figure 1, switch valve 6 is in left position (connecting position), now, first Pump P3 to be led to connect with guide's hydraulic fluid port of straight travel valve 5, driving straight travel valve 5, which commutates to left position, to work, then, the first main pump P1 is respectively that left running motor 2 and right running motor 3 supply by left travel motor control valve 20 and right travel motor control valve 30 Oil, the second main pump P2 is then rotary motor fuel feeding by rotary motor control valve 40, also, now pioneer pump P3 is also straight with first Line travel control valve connects with the control port K of second straight line travel control valve, then first straight line travel control valve and second The first oil passage control valve 12, the second oil passage control valve 13, the 3rd oil passage control valve 14 and the 4th oil circuit of straight line moving control valve Control valve 15 is fully open, and therefore, the inlet pressure and outlet pressure of first throttle valve 21 are then respectively acting on first straight line First control valve pocket of the main control valve 11 of travel control valve and the second control valve pocket, the inlet pressure of second throttle 31 and go out Mouth pressure is then respectively acting on the second control valve pocket and the first control valve of the main control valve 11 of first straight line travel control valve Chamber, the inlet pressure and outlet pressure of the 3rd choke valve 22 are then respectively acting on the main control valve of second straight line travel control valve 11 the first control valve pocket and the second control valve pocket, the inlet pressure and outlet pressure of the 4th choke valve 32 are then respectively acting on Second control valve pocket of the main control valve 11 of second straight line travel control valve and the first control valve pocket, so, first straight line walking Control valve and second straight line travel control valve can adjust the first main pump P1 by comparing the uninterrupted of left and right running motor Distribution of the hydraulic fluid flow rate provided between the running motor of left and right, and then realize the control to straight line moving.
For convenience, come below so that complete machine performs the composite move for advancing and turning round as an example to straight line moving control valve The process for how adjusting assignment of traffic illustrates, and now first straight line travel control valve, first throttle valve 21 and second throttle Valve 31 works：
Now, if the load of left and right running motor is identical, it is equal to flow through the flow of left and right running motor, first throttle valve 21 is equal with the inlet and outlet pressure difference of second throttle 31, i.e. the first external hydraulic fluid port a of first straight line travel control valve, outside second Oil-collecting hole b, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th pressure meet following relation Pa-Pb=Pd-Pc, namely Pa+Pc= Pb+Pd, so, the pressure phase of the first control valve pocket of the main control valve 11 of first straight line travel control valve and the second control valve pocket Together, therefore on the premise of identical active area, the active force phase at the both ends of the main control valve 11 of first straight line travel control valve Deng primary control spool 110 is in middle position, the first main oil inlet g in the presence of the end spring 113 of first end spring 111 and second Disconnected with the first main main oil inlet h of oil-out e and second and the second main oil-out f, main control valve 11, which is not reduced, flows through two Any one flow in individual running motor, the two holding is equal, and complete machine keeps straight line moving；
And when the load of left and right running motor differs, if the load of left running motor 2 is negative more than right running motor 3 Carry, then complete machine has sideslip to the left or even the trend turned, and is less than by the flow of first throttle valve 21 and passes through second throttle 31 flow, the inlet outlet pressure differential of first throttle valve 21 are less than the inlet outlet pressure differential of second throttle 31, i.e. first straight line is walked First external hydraulic fluid port a of control valve, the second external hydraulic fluid port b, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th pressure meet such as Lower relation：Pa-Pb<Pd-Pc, namely Pa+Pc<Pb+Pd, it is seen then that the first control of the main control valve 11 of first straight line travel control valve The pressure of valve pocket is less than the pressure of the second control valve pocket, according to direction shown in Fig. 1, the primary control spool 110 of main control valve 11 to Upper movement, main control valve 11 gradually commutate to the second spool position, the first main oil inlet g and are still turned off with the first main oil-out e, And the second main oil inlet h and the second main oil-out f is gradually opened, then advance guide's hydraulic fluid port of right travel motor control valve 30 Hydraulic oil can flow back to fuel tank by the second main main oil-out f of oil inlet h and second, and the advance of right travel motor control valve 30 is first Oil diverting port pressure declines, so that right travel motor control valve 30 moves to middle position, valve port opening diminishes, and reduction flows through right lateral and walked The flow of motor 3, and the flow of reduction enters left running motor 2, until the flow of left and right running motor is equal, complete machine is realized straight Line is walked, and now main control valve 11 is returned to middle position；
And if the load of left running motor 2 is less than the load of right running motor 3, then complete machine has sideslip to the right or even turned Trend, the flow by second throttle 31, the inlet and outlet of first throttle valve 21 are more than by the flow of first throttle valve 21 Pressure difference is more than the inlet outlet pressure differential of second throttle 31, i.e. the external hydraulic fluid port a of the first of first straight line travel control valve, second external Hydraulic fluid port b, the 3rd external external hydraulic fluid port d of hydraulic fluid port c and the 4th pressure meet following relation：Pa-Pb>Pd-Pc, namely Pa+Pc>Pb+ Pd, it is seen then that the pressure of the first control valve pocket of the main control valve 11 of first straight line travel control valve is more than the second control valve pocket Pressure, according to direction shown in Fig. 1, the primary control spool 110 of main control valve 11 moves down, main control valve 11 gradually commutation to the One spool position, the second main oil inlet h are still turned off with the second main oil-out f, the first main main oil-out e of oil inlet g and first Then it is gradually opened, then the hydraulic oil of advance guide's hydraulic fluid port of left travel motor control valve 20 can pass through the first main oil inlet g Fuel tank is flowed back to the first main oil-out e, advance guide's hydraulic fluid port pressure of left travel motor control valve 20 declines, so that left lateral is walked Motor control valve 20 moves to middle position, and valve port opening diminishes, and reduces the flow for flowing through left running motor 2, and the flow of reduction enters Enter right running motor 3, until the flow of left and right running motor is equal, complete machine realizes straight line moving, and now main control valve 11 returns again To middle position.
It will be apparent to those skilled in the art that when engineering machinery performs and retreats and turn round composite move, straight line moving control The process of valve regulating flow distribution processed is similar with process during above-mentioned advance, and difference is only that now by second straight line travelling control Valve, the 3rd choke valve 22 and the 4th choke valve 32 work, and here is omitted for detailed process.
It is furthermore pointed out that only it is a kind of allusion quotation using rotary motor 4 as executing agency of getting on the bus in this embodiment Type structure illustrates, in fact, the rotary motor 4 can also be swing arm II, dipper I, destroyer, swing arm I, scraper bowl and dipper Other executing agencies of getting on the bus of II grade, the schematic diagram of these executing agencies why is not presented in Fig. 1, is to be based in explanation directly Simplify the consideration of hydraulic schematic diagram on the premise of line traveling control system operation principle as far as possible, and actually change revolution work connection Into swing arm connection or dipper connection, increase other work such as destroyer connection even on current principles figure, for illustrating linear rows For the operation principle for walking control system, what effect was just as, simply operating mode is more complicated, is brief and concise explanation Problem, the embodiment only list revolution connection as explanation object.
Due to generally in real work, the load moment of running motor is changing during engineering machinery straight line moving or so, Therefore, the primary control spool 110 of main control valve 11 is also at a kind of variable condition of floating.Left and right running motor flow and master control There is following relation between the floating position of the primary control spool 110 of valve 11 processed：
Wherein, qIt is leftTo flow through the flow of left running motor 2, qIt is rightTo flow through the flow of right running motor 3, K is running motor Control the orifice shapes coefficient of valve core, K1For the ratio system of travel motor control valve spool displacement and orifice area variable quantity Number, Δ p are travel motor control valve spool design chock pressure difference, KGuide's springFor travel motor control valve valve core reseting spring elasticity Modulus, α are the upstream pressure of main control valve 11 and its open area fraction coefficient, and θ is the primary control spool 110 of main control valve 11 Aperture area and the proportionality coefficient of its displacement, Δ L are the displacement variable of the primary control spool 110 of main control valve 11.
It can be seen that the straight line moving control system of the embodiment can according to the actual conditions of the load of both sides running motor, Distribution of the flow between the running motor of left and right, when walking load is different, even difference is larger in both sides, straight line are controlled in real time Travel control valve 1 can reduce the flow of the faster running motor of travel speed rapidly, while increase the slower row of travel speed The flow of motor is walked, the flow of left and right running motor is always tended to be equal in the working conditions change of complexity, therefore can be effective Realize the straight line moving of engineering machinery in ground, it is ensured that engineering machinery will not be to high side sideslip or turning be loaded, and improving operation can By property, and ensure construction safety.
In addition, the straight line moving control system of the present invention, is not changing original main pump, left and right running motor, executing agency Oil circuit on the premise of, can effectively solve the problem that existing skill by setting up straight line moving control valve 1 and flow-pressure differential conversion equipment The problem of engineering machinery can not keep straight line moving in walking load difference in art, oil circuit is simple, and reliability is high, and installs Convenient, cost is relatively low.Such as in the above-described embodiments, four conventional throttle valves are only additionally arranged on the basis of original hydraulic system With two straight line moving control valves 1 of the invention, cost compares what CN102888873A patents were introduced below 1500 yuan More than increased ten thousand yuan costs of system, present invention significantly reduces cost, has greater advantage.
Straight line moving control system provided by the present invention is additionally, since mainly by being formed for hydraulic valve class mechanical part, The control system of electric device of comparing has higher reliability, especially operation frequently, load switching is faster excavates Mechanical field, the advantage in terms of this reliability can be more obvious.
Meanwhile straight line moving control valve 1 of the invention and flow-pressure differential conversion equipment can be with integrated installations in left and right crawler belt On running motor covering in, or be directly installed on the outlet of travel motor control valve, easy installation and removal, avoid examining The trouble necessarily wanted is caused when repairing.
The straight line moving control system of the present invention can be used for it is any have the engineering machinery of straight line moving demand, such as excavate Machine.
Therefore, third aspect present invention also provides a kind of excavator, and it includes the straight line moving control of any of the above embodiment System processed.
The exemplary embodiment of the present invention is the foregoing is only, is not intended to limit the invention, all spirit in the present invention Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.

Claims (17)

1. a kind of straight line moving control valve (1), including valve body (10), it is characterised in that the valve body (10) is provided with main control Valve (11), the first external hydraulic fluid port (a), the second external hydraulic fluid port (b), the 3rd external hydraulic fluid port (c) and the 4th external hydraulic fluid port (d) are described Main control valve (11) includes the first main oil inlet (g), the first main oil-out (e), the second main oil inlet (h), the second main oil-out (f), the first control valve pocket and the second control valve pocket, wherein：
The main control valve (11) has the first spool position and the second spool position, the first control valve pocket and described second Control valve pocket is respectively arranged at the both ends of the main control valve (11) to control the main control valve (11) in first valve element Switch between position and second spool position, the pressure of the first control valve pocket is more than the pressure of the described second control valve pocket During power, the main control valve (11) is in first spool position, and the first main oil inlet (g) and the described first master are fuel-displaced Mouth (e) connects and the second main oil inlet (h) disconnects with the described second main oil-out (f)；The pressure of the first control valve pocket When power is less than the pressure of the described second control valve pocket, the main control valve (11) is in second spool position, and described second Main oil inlet (h) connects and the first main oil inlet (g) and the described first main oil-out with the described second main oil-out (f) (e) disconnect；Also,
The first external hydraulic fluid port (a) is connected by the first oil circuit with the described first control valve pocket, the second external hydraulic fluid port (b) It is connected by the second oil circuit with the described second control valve pocket, the 3rd external hydraulic fluid port (c) passes through the 3rd oil circuit and described first Valve pocket connection is controlled, the 4th external hydraulic fluid port (d) is connected by the 4th oil circuit with the described second control valve pocket.
2. straight line moving control valve (1) according to claim 1, it is characterised in that the straight line moving control valve (1) is also Including the auxiliary controls being arranged on the valve body (10), the auxiliary controls be used for control first oil circuit, The break-make of second oil circuit, the 3rd oil circuit and the 4th oil circuit.
3. straight line moving control valve (1) according to claim 2, it is characterised in that the auxiliary controls include the One auxiliary controls and the second auxiliary controls, first auxiliary controls are used to control the logical of first oil circuit The break-make of disconnected and described second oil circuit, second auxiliary controls are used for break-make and the institute for controlling the 3rd oil circuit State the break-make of the 4th oil circuit.
4. straight line moving control valve (1) according to claim 3, it is characterised in that the first auxiliary controls bag Include the first auxiliary spool, the first oil inlet, the first oil-out, the second oil inlet and the second oil-out, the first auxiliary control First oil inlet of mechanism connects with the described first external hydraulic fluid port (a), the second oil inlet of first auxiliary controls with Second external hydraulic fluid port (b) connection, the first oil-out of first auxiliary controls connect with the described first control valve pocket Logical, the second oil-out of first auxiliary controls is connected with the described second control valve pocket, and first auxiliary spool is used Between the first oil inlet and the first oil-out of first auxiliary controls is controlled and the second oil inlet goes out with second Simultaneously in connection and a kind of state in cut-off two states between hydraulic fluid port；And/or
Second auxiliary controls include the second auxiliary spool, the first oil inlet, the first oil-out, the second oil inlet and the Two oil-outs, the first oil inlet of second auxiliary controls connect with the 3rd external hydraulic fluid port (c), and described second is auxiliary The second oil inlet of controlling organization is helped to be connected with the 4th external hydraulic fluid port (d), the first of second auxiliary controls go out Hydraulic fluid port connects with the described first control valve pocket, the second oil-out of second auxiliary controls and the described second control valve pocket Connect, between the first oil inlet and the first oil-out of second auxiliary spool for controlling second auxiliary controls And second between oil inlet and the second oil-out simultaneously in connect with ending a kind of state in two states.
5. straight line moving control valve (1) according to claim 3, it is characterised in that the first auxiliary controls bag Include the first oil passage control valve (12) being arranged on first oil circuit and the second oil circuit being arranged on second oil circuit Control valve (13), wherein：First oil passage control valve (12) includes the first valve element (120), oil inlet and oil-out, and described One valve element (120) is used to control whether the oil inlet of first oil passage control valve (12) connects with oil-out, first oil The oil inlet of road control valve (12) connects with the described first external hydraulic fluid port (a), the oil-out of first oil passage control valve (12) Connected with the described first control valve pocket；Second oil passage control valve (13) includes the second valve element (130), oil inlet and fuel-displaced Mouthful, second valve element (130) is used to control whether the oil inlet of second oil passage control valve (13) connects with oil-out, institute The oil inlet for stating the second oil passage control valve (13) connects with the described second external hydraulic fluid port (b), second oil passage control valve (13) Oil-out with described second control valve pocket connect；And/or
Second auxiliary controls include the 3rd oil passage control valve (14) being arranged on the 3rd oil circuit and set The 4th oil passage control valve (15) on the 4th oil circuit, wherein：3rd oil passage control valve (14) includes the 3rd valve element (140), oil inlet and oil-out, the 3rd valve element (140) are used for the oil inlet for controlling the 3rd oil passage control valve (14) Whether connected with oil-out, the oil inlet of the 3rd oil passage control valve (14) connects with the 3rd external hydraulic fluid port (c), described The oil-out of 3rd oil passage control valve (14) connects with the described first control valve pocket；4th oil passage control valve (15) includes the Four valve elements (150), oil inlet and oil-out, the 4th valve element (150) are used to control the 4th oil passage control valve (15) Whether oil inlet connects with oil-out, and the oil inlet of the 4th oil passage control valve (15) connects with the described 4th external hydraulic fluid port (d) Logical, the oil-out of the 4th oil passage control valve (15) connects with the described second control valve pocket.
6. straight line moving control valve (1) according to claim 5, it is characterised in that the first auxiliary controls bag First oil passage control valve (12) and second oil passage control valve (13) are included, and second auxiliary controls include 3rd oil passage control valve (14) and the 4th oil passage control valve (15), wherein, the first external hydraulic fluid port (a) and described 3rd external hydraulic fluid port (c) is arranged at described first control valve pocket one end, and the first external hydraulic fluid port (a) and the described 3rd external Hydraulic fluid port (c) is located at the both sides of the main control valve (11)；The second external hydraulic fluid port (b) sets with the 4th external hydraulic fluid port (d) Described second control valve pocket one end is placed in, the second external hydraulic fluid port (b) is arranged at the master with the 4th external hydraulic fluid port (d) The both sides of control valve (11), and the second external hydraulic fluid port (b) is located at the main control valve with the described first external hydraulic fluid port (a) (11) the same side and the 4th external hydraulic fluid port (d) is located at the main control valve (11) with the 3rd external hydraulic fluid port (c) The same side.
7. straight line moving control valve (1) according to claim 2, it is characterised in that the auxiliary controls include the Three auxiliary controls and the 4th auxiliary controls, the 3rd auxiliary controls are used to control the logical of first oil circuit The break-make of disconnected and described 3rd oil circuit, the 4th auxiliary controls are used for break-make and the institute for controlling second oil circuit State the break-make of the 4th oil circuit.
8. straight line moving control valve (1) according to claim 7, it is characterised in that the 3rd auxiliary controls bag Include the 3rd auxiliary spool, the first oil inlet, the first oil-out, the second oil inlet and the second oil-out, the 3rd auxiliary control First oil inlet of mechanism connects with the described first external hydraulic fluid port (a), the second oil inlet of the 3rd auxiliary controls with 3rd external hydraulic fluid port (c) connection, the first oil-out and the second oil-out of the 3rd auxiliary controls with it is described First control valve pocket connection, the 3rd auxiliary spool are used for the first oil inlet and for controlling the 3rd auxiliary controls The one kind connected with cut-off two states is between one oil-out and simultaneously between second oil inlet and the second oil-out State；And/or
4th auxiliary controls include the 4th auxiliary spool, the first oil inlet, the first oil-out, the second oil inlet and the Two oil-outs, the first oil inlet of the 4th auxiliary controls connect with the described second external hydraulic fluid port (b), and the described 4th is auxiliary The second oil inlet of controlling organization is helped to be connected with the 4th external hydraulic fluid port (d), the first of the 4th auxiliary controls go out Hydraulic fluid port and the second oil-out connect with the described second control valve pocket, and the 4th auxiliary spool is used to control the 4th auxiliary Between the first oil inlet and the first oil-out of controlling organization and between the second oil inlet and the second oil-out while in company A kind of state in the logical two states with cut-off.
9. according to any described straight line moving control valves of claim 2-8, it is characterised in that the auxiliary controls control First oil circuit, second oil circuit, the 3rd oil circuit and the 4th oil circuit synchronization break-make.
10. straight line moving control valve according to claim 9, it is characterised in that the auxiliary controls have work Position and rest position, it is used to control first oil circuit, described the when the auxiliary controls are in the operating position Two oil circuits, the 3rd oil circuit and the 4th oil circuit are in connected state, and the auxiliary controls are in the cut-off position It is used to control first oil circuit, second oil circuit, the 3rd oil circuit and the 4th oil circuit to be off when putting, The straight line moving control valve (1) also includes the control port (K) being arranged on the valve body (10), the control port (K) For controlling the auxiliary controls to switch between the operating position and the rest position.
A kind of 11. straight line moving control system, for controlling engineering machinery to keep straight line moving, the straight line moving control system Including left running motor (2), left travel motor control valve (20), right running motor (3) and right travel motor control valve (30), its It is characterised by,
First flow-pressure difference conversion device is provided with the advance oil-feed oil circuit of the left running motor (2), is walked in the right lateral The advance oil-feed oil circuit of motor (3) is provided with second flow-pressure difference conversion device, the first flow-pressure difference reforming unit The pressure differential of inlet and outlet and the flow positive correlation of the advance oil-feed oil circuit of the left running motor (2), the second flow- The pressure differential of the inlet and outlet of pressure difference conversion device and the flow positive of the advance oil-feed oil circuit of the right running motor (3) Close, the straight line moving control system also includes first straight line travel control valve, and the first straight line travel control valve is as weighed Profit requires any described straight line moving control valves (1) of 1-10, wherein：First external oil collecting of the first straight line travel control valve The inlet communication of mouth (a) and the first flow-pressure difference reforming unit, the second external oil collecting of the first straight line travel control valve The outlet of mouth (b) and the first flow-pressure difference reforming unit, the 3rd external oil collecting of the first straight line travel control valve The outlet of mouth (c) and the second flow-pressure difference reforming unit, the 4th external oil collecting of the first straight line travel control valve The inlet communication of mouth (d) and the second flow-pressure difference reforming unit, the main control valve of the first straight line travel control valve (11) the first main oil inlet (g) connects with advance guide's hydraulic fluid port of the left travel motor control valve (20), and described first is straight The advance of second main oil inlet (h) of the main control valve (11) of line travel control valve and the right travel motor control valve (30) is first Oil diverting port connects, and the first main oil-out (e) of the main control valve (11) of the first straight line travel control valve and the second master are fuel-displaced Mouth (f) connects with fuel tank；And/or
The 3rd flow-pressure differential conversion equipment is provided with the retrogressing oil-feed oil circuit of the left running motor (2), is walked in the right lateral The retrogressing oil-feed oil circuit of motor (3) is provided with the 4th flow-pressure differential conversion equipment, the 3rd flow-pressure differential reforming unit The pressure differential of inlet and outlet and the flow positive correlation of the retrogressing oil-feed oil circuit of the left running motor (2), the 4th flow- The pressure differential of the inlet and outlet of pressure difference conversion device and the flow positive of the retrogressing oil-feed oil circuit of the right running motor (3) Close, the straight line moving control system also includes second straight line travel control valve, and the second straight line travel control valve is as weighed Profit requires any described straight line moving control valves (1) of 1-10, wherein：First external oil collecting of the second straight line travel control valve The inlet communication of mouth (a) and the 3rd flow-pressure differential reforming unit, the second external oil collecting of the second straight line travel control valve The outlet of mouth (b) and the 3rd flow-pressure differential reforming unit, the 3rd external oil collecting of the second straight line travel control valve The outlet of mouth (c) and the 4th flow-pressure differential reforming unit, the 4th external oil collecting of the second straight line travel control valve The inlet communication of mouth (d) and the 4th flow-pressure differential reforming unit, the main control valve of the second straight line travel control valve (11) the first main oil inlet (g) connects with retrogressing guide's hydraulic fluid port of the left travel motor control valve (20), and described second is straight The retrogressing of second main oil inlet (h) of the main control valve (11) of line travel control valve and the right travel motor control valve (30) is first Oil diverting port connects, and the first main oil-out (e) of the main control valve (11) of the second straight line travel control valve and the second master are fuel-displaced Mouth (f) connects with fuel tank.
12. straight line moving control system according to claim 11, it is characterised in that the first flow-pressure difference conversion Device includes throttling arrangement, and/or the second flow-pressure difference reforming unit includes throttling arrangement, and/or the 3rd stream Amount-pressure difference reforming unit includes throttling arrangement, and/or the 4th flow-pressure differential reforming unit includes throttling arrangement.
13. straight line moving control system according to claim 12, it is characterised in that the throttling arrangement includes throttling Valve.
14. according to any described straight line moving control systems of claim 11-13, it is characterised in that the straight line moving control Valve (1) processed includes auxiliary controls, and the auxiliary controls have operating position and rest position, the auxiliary control machine It is used to control first oil circuit, second oil circuit, the 3rd oil circuit and the described 4th when structure is in the operating position Oil circuit is in connected state, is used to control first oil circuit, described when the auxiliary controls are in the rest position Second oil circuit, the 3rd oil circuit and the 4th oil circuit are off, and the straight line moving control valve (1) also includes setting The control port (K) on the valve body (10) is put, the control port (K) is used to control the auxiliary controls described Switch between operating position and the rest position, the straight line moving control system includes pioneer pump (P3), the pioneer pump (P3) outlet is connected with the control port (K).
15. straight line moving control system according to claim 14, it is characterised in that the straight line moving control system bag Switch valve (6) is included, the control port (K) is connected by the switch valve (6) with the outlet of pioneer pump (P3).
16. straight line moving control system according to claim 15, it is characterised in that the straight line moving control system bag Straight travel valve (5) is included, guide's hydraulic fluid port of the straight travel valve (5) is connected with the control port (K) and the straight line Guide's hydraulic fluid port of walking valve (5) is connected by the switch valve (6) with the outlet of the pioneer pump (P3).
17. a kind of excavator, it is characterised in that the excavator includes the straight line moving as described in claim 11-16 is any Control system.
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