CN103899588B - Lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane - Google Patents
Lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane Download PDFInfo
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- CN103899588B CN103899588B CN201410023523.8A CN201410023523A CN103899588B CN 103899588 B CN103899588 B CN 103899588B CN 201410023523 A CN201410023523 A CN 201410023523A CN 103899588 B CN103899588 B CN 103899588B
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Abstract
The present invention relates to a kind of lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane, lorry-mounted crane multi-way reversing device comprises: master winch selector valve, flexible selector valve, slewing directional control valve and luffing selector valve, described luffing selector valve and flexible selector valve are in parallel on oil-feed oil circuit, and external first quantitative oil pump of oil-feed oil circuit, external second quantitative oil pump of oil-feed oil circuit of described slewing directional control valve, the oil-feed oil circuit of wherein said slewing directional control valve collaborates to connect on oil-feed oil circuit with described master winch selector valve afterwards with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, position on the oil-feed oil circuit of described slewing directional control valve before junction of two streams is also provided with interflow one-way valve.The present invention collaborates control form before can realizing valve at lower cost, improves the operating efficiency of car load.
Description
Technical field
The present invention relates to engineering machinery field, particularly relate to a kind of lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane.
Background technique
Lorry-mounted crane is that one is arranged on automobile chassis, many action machineries of handling of heavy goods within the specific limits, there are quick, flexible, efficient, convenient, collection handling and transport the feature that unites two into one, be widely used in the fields such as urban construction, colliery engineering, the lifting of afforestation and equipment and transport.According to structural type, lorry-mounted crane can be divided into straight-arm lorry-mounted crane and folding arm lorry-mounted crane.
Straight-arm lorry-mounted crane can be stretched out arm by the telescopic oil cylinder of arm or retract, the wire rope of being drawn by hoisting mechanism can mention goods, main actions comprises luffing, flexible, elevator and revolution etc., there is simple to operate, applied widely, Security advantages of higher, be used widely in China, account for the market share of more than 80%.In recent years, along with the development of market, technology, large-tonnage, Energy Saving Control, modularization, the multi-functional technology trends becoming straight-arm lorry-mounted crane.
Multi-way valve is the core parts of straight-arm lorry-mounted crane hydraulic control system, and its principle directly determines the performance of complete machine, efficiency, energy consumption and cost.How to realize elevator interflow, improve lifting capacity, accelerate operating efficiency, increase several functions, realize composite move, reduce energy consumption, improve the degree of modularity and reduce costs, to improve the cost performance of car load, be those skilled in the art's technical issues that need to address.
Fig. 1 is existing a kind of straight-arm Multi-way directional valve for lorry-mounted crane, and its feature is: adopt two metering pump fuel feeding, in rolling control combined stream, achieve interlock and the action of elevator double speed of partial act, thus with lower cost hydraulic system performance.But this multiple directional control valve still also exists a lot of technological deficiency, as follows:
The principle of collaborating after 1, rolling control connection adopts valve, little oil pump feed first through elevator selector valve, and then collaborates with large oil pump feed, and through selector valve often, restriction loss is large, and energy consumption is high, causes car load operating efficiency low for fluid;
2, elevator selector valve is five eight structural types of leading to, have five working positions, eight hydraulic fluid ports, operational stroke is long, spool adjustment stroke is short, oil circuit is complicated, needs special manufacture, has that adjusting function is bad, complex structure, poor universality, cost are high and the problem such as maintenance difficult;
3, the large oil pump feed side of elevator selector valve is without one-way valve, can not prevent hydraulic shock from flowing backwards, weaken hydraulic control system reliability;
4, to control the Dimensions of connection identical for flexible, luffing and revolution, can not meet that heavy tonnage lorry-mounted crane stretches, through-current capability this contradiction different of difference commutation connection that flow needed for luffing brings much larger than the required flow of revolution;
5, multiple directional control valve lacks additional move, can not meet the demand in diversified market;
6, luffing, extension and contraction control connection lack auxiliary plug-in, and there is the problems such as robust motion difference, safety protection is not enough in operation process, control performance still has much room for improvement.
In addition, also there is the truck crane interflow multi-way valve adopting special hydraulic control converging valve at present, before the valve of employing, collaborates control mode, achieve the interflow of flexible, luffing and flexible luffing composite move, significantly improve the operating efficiency of car load.But this interflow multi-way valve is load sensing multi-way valve, and interflow needs special liquid controling element to control, and guide's oil circuit is complicated, and cost is higher, is not suitable for the market orientation of straight-arm lorry-mounted crane.
Summary of the invention
The object of the invention is to propose a kind of lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane, collaborate control form before valve can be realized at lower cost, improve the operating efficiency of car load.
For achieving the above object, the invention provides a kind of lorry-mounted crane multi-way reversing device, comprise: master winch selector valve, flexible selector valve, slewing directional control valve and luffing selector valve, described luffing selector valve and flexible selector valve are in parallel on oil-feed oil circuit, and external first quantitative oil pump of oil-feed oil circuit, external second quantitative oil pump of oil-feed oil circuit of described slewing directional control valve, it is characterized in that, the oil-feed oil circuit of described slewing directional control valve collaborates to connect on oil-feed oil circuit with described master winch selector valve afterwards with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, position on the oil-feed oil circuit of described slewing directional control valve before junction of two streams is also provided with interflow one-way valve.
Further, the discharge capacity of described first quantitative oil pump is greater than the discharge capacity of described second quantitative oil pump.
Further, also comprise: secondary elevator selector valve, described secondary elevator selector valve and described slewing directional control valve are in parallel on oil-feed oil circuit.
Further, described master winch selector valve, flexible selector valve and luffing selector valve adopt the valve body of the first specification, described secondary elevator selector valve and slewing directional control valve adopt the valve body of the second specification, the valve body of described first specification is corresponding with the discharge capacity of described first quantitative oil pump, and the valve body of described second specification is corresponding with the discharge capacity of described second quantitative oil pump.
Further, the valve body that described luffing selector valve is corresponding is also provided with the large chamber of luffing time step valve, luffing loculus time step valve, the empty valve of the anti-suction in the large chamber of luffing and the empty valve of the anti-suction of luffing loculus, the large chamber of two external amplitude oil cylinder of actuator ports difference of the valve body that described luffing selector valve is corresponding and loculus, between the return opening of the valve body that two actuator ports that the large chamber of described luffing time step valve and the secondary step valve of luffing loculus are connected on valve body corresponding to described luffing selector valve are respectively corresponding with described master winch selector valve, the empty valve of the anti-suction in the large chamber of described luffing is in parallel with the large chamber of described luffing time step valve, the empty valve of the anti-suction of described luffing loculus is in parallel with described luffing loculus time step valve.
Further, the valve body that described flexible selector valve is corresponding is also provided with flexible large chamber time step valve and flexible loculus time step valve, the large chamber of two external telescopic oil cylinders of actuator ports difference of the valve body that described flexible selector valve is corresponding and loculus, between the return opening of the valve body that two actuator ports that described flexible large chamber time step valve and the secondary step valve of flexible loculus are connected on valve body corresponding to described flexible selector valve are respectively corresponding with described master winch selector valve.
Further, the oil-feed oil circuit before the filler opening of described flexible selector valve, luffing selector valve, master winch selector valve, secondary elevator selector valve and slewing directional control valve is also provided with one-way valve.
Further, the return opening of the valve body that described master winch selector valve is corresponding is double back hydraulic fluid port arranged side by side.
Further, described luffing selector valve, flexible selector valve, master winch selector valve, slewing directional control valve and valve body corresponding to secondary elevator selector valve superpose assembling in order, second oil-feed connection of the first oil-feed connection being also separately installed with the valve body of employing first specification in both sides and the valve body adopting the second specification, described first oil-feed connection comprises the first main relief valve, first pressure oil port and the first pressure tap, described first pressure oil port communicates with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, the external pressure measuring element of described first pressure tap, described first main relief valve is arranged on described first pressure oil port and between described luffing selector valve and the oil return circuit of flexible selector valve, described second oil-feed connection comprises the second main relief valve, second pressure oil port and the second pressure tap, described second pressure oil port communicates with the oil-feed oil circuit of described secondary elevator selector valve and slewing directional control valve, the external pressure measuring element of described second pressure tap, described second main relief valve is arranged on described second pressure oil port and between described secondary elevator selector valve and the oil return circuit of slewing directional control valve.
Based on technique scheme, the mode that master winch selector valve of the present invention collaborates before have employed valve, the oil-feed oil circuit of slewing directional control valve is made to collaborate to connect on oil-feed oil circuit with described master winch selector valve afterwards with the oil-feed oil circuit of luffing selector valve and flexible selector valve, and by interflow one-way valve unilaterally connected second quantitative oil pump and master winch selector valve, make the oil feeding line corresponding to two quantitative oil pumps before master winch selector valve, realize interflow by this structure, interflow fluid is through master winch selector valve supply main winch motor, realize the high-speed motion of main winch motor, compared to confluent structure after valve, then decrease restriction loss, reduce energy consumption, in addition, owing to collaborating to control without the need to special liquid controling element before valve of the present invention, structure is simple, with low cost, be applicable to the market orientation of straight-arm lorry-mounted crane.
In another embodiment, the discharge capacity of described first quantitative oil pump is greater than the discharge capacity of described second quantitative oil pump.Consider that the luffing in straight-arm lorry-mounted crane, hydraulic fluid flow rate demand that is flexible and master winch are larger, and the hydraulic fluid flow rate demand of revolution and secondary elevator is less, therefore the discharge capacity of respective external quantitative oil pump is also different, namely the first quantitative oil pump of relatively large discharge capacity is selected, and the second quantitative oil pump of relatively small displacement.
In another embodiment, also comprise: secondary elevator selector valve, described secondary elevator selector valve and described slewing directional control valve are in parallel on oil-feed oil circuit.Secondary elevator selector valve can control secondary hoist motor, can be used alone the object of lift up rapidly lower weight, with master winch with the use of lifting by crane special object, thus can also expand the operation function of straight-arm lorry-mounted crane.
In another embodiment, described master winch selector valve, flexible selector valve and luffing selector valve adopt the valve body of the first specification, described secondary elevator selector valve and slewing directional control valve adopt the valve body of the second specification, the valve body of described first specification is corresponding with the discharge capacity of described first quantitative oil pump, and the valve body of described second specification is corresponding with the discharge capacity of described second quantitative oil pump.Lorry-mounted crane multi-way reversing device of the present invention can adopt the valve body of two kinds of specifications, corresponding to the different displacements of two kinds of quantitative oil pumps, can either meet the demand of the through-current capability respectively performed an action, can reduce costs again.
In another embodiment, the valve body that described master winch selector valve is corresponding is also provided with rise secondary valve and master winch of master file to fall time step valve, two actuator ports of the valve body that described master winch selector valve is corresponding are the rising chamber of external main winch motor and decline chamber respectively, and described master file secondary valve and the master winch time step valve that falls that rises is connected on two of valve body corresponding to described master winch selector valve between actuator port and return opening respectively.Master file secondary valve and the master winch time step valve that falls that rises is auxiliary plug-in in valve body that master winch selector valve is corresponding, and the Maximum operating pressure that can limit main winch motor is no more than the authorized pressure of main winch motor.
In another embodiment, the valve body that described luffing selector valve is corresponding is also provided with the large chamber of luffing time step valve, luffing loculus time step valve, the empty valve of the anti-suction in the large chamber of luffing and the empty valve of the anti-suction of luffing loculus, the large chamber of two external amplitude oil cylinder of actuator ports difference of the valve body that described luffing selector valve is corresponding and loculus, between the return opening of the valve body that two actuator ports that the large chamber of described luffing time step valve and the secondary step valve of luffing loculus are connected on valve body corresponding to described luffing selector valve are respectively corresponding with described master winch selector valve, the empty valve of the anti-suction in the large chamber of described luffing is in parallel with the large chamber of described luffing time step valve, the empty valve of the anti-suction of described luffing loculus is in parallel with described luffing loculus time step valve.The large chamber of luffing time step valve, luffing loculus time step valve, the empty valve of the anti-suction in the large chamber of luffing and the empty valve of the anti-suction of luffing loculus are the auxiliary plug-in in valve body that luffing selector valve is corresponding, and acting in conjunction improves luffing control performance.In motion and braking process, high-voltage oil liquid is allowed to be overflowed by the large chamber of luffing time step valve and luffing loculus time step valve, the fluid of oil return simultaneously directly enters the oil cylinder chamber of vacuum through the empty valve of the anti-suction in the large chamber of luffing and the empty valve of the anti-suction of luffing loculus, prevent the generation of vacuum, avoid the generation of repeatedly hydraulic shock, thus serve the effect of buffering step-down, thus make luffing action movement steadily, impact less.
In another embodiment, the valve body that described flexible selector valve is corresponding is also provided with flexible large chamber time step valve and flexible loculus time step valve, the large chamber of two external telescopic oil cylinders of actuator ports difference of the valve body that described flexible selector valve is corresponding and loculus, between the return opening of the valve body that two actuator ports that described flexible large chamber time step valve and the secondary step valve of flexible loculus are connected on valve body corresponding to described flexible selector valve are respectively corresponding with described master winch selector valve.Flexible large chamber time step valve and flexible loculus time step valve are the auxiliary plug-in in valve body that flexible selector valve is corresponding, for improving telescopic control function.Flexible large chamber time step valve is secondary pressure-limit valve; for limiting the large cavity pressure of telescopic oil cylinder; the band that will meet straight-arm lorry-mounted crane on the one hand carries Telescopic requirement; limit again on the other hand straight-arm lorry-mounted crane band and carry the allowed band of flexible ability at telescopic oil cylinder and boom structure, protective system.Flexible loculus time step valve is also secondary pressure-limit valve, for limiting the little cavity pressure of telescopic oil cylinder, increase pressure surge when hydraulic system damping reduction is retracted by overflow and utilize load deadweight to realize arm on the one hand and retract, thus improve robust motion, reduction energy consumption, need on the other hand to ensure that oil liquid pressure is enough large, to realize unloaded retraction.
In another embodiment, the valve body that described slewing directional control valve is corresponding is also provided with the just secondary step valve of revolution and the inverse time step valve of revolution, the forward chamber of two external rotary motors of actuator ports difference of the valve body that described slewing directional control valve is corresponding and reverse chamber, between the return opening of the valve body that two actuator ports that the just secondary step valve of described revolution and the inverse time step valve of revolution are connected on valve body corresponding to described slewing directional control valve are respectively corresponding with described master winch selector valve.Turning round just secondary step valve and revolution inverse step valve is auxiliary plug-in in valve body that slewing directional control valve is corresponding, and the Maximum operating pressure for limiting rotary motor is no more than the authorized pressure of motor.
In another embodiment, the valve body that described secondary elevator selector valve is corresponding is also provided with secondary elevator to rise time step valve and secondary elevator and to fall time step valve, two actuator ports of the valve body that described secondary elevator selector valve is corresponding are the rising chamber of external secondary hoist motors and decline chamber respectively, and described secondary elevator rises time step valve and the secondary elevator time step valve that falls and is connected on respectively between the return opening of two actuator ports of valve body corresponding to described secondary elevator selector valve valve body corresponding with described master winch selector valve.Having secondary elevator to rise time step valve and the secondary elevator time step valve that falls is auxiliary plug-in in valve body that secondary elevator selector valve is corresponding, and the Maximum operating pressure for limiting secondary hoist motor is no more than the authorized pressure of motor.
In another embodiment, the oil-feed oil circuit before the filler opening of described flexible selector valve, luffing selector valve, master winch selector valve, secondary elevator selector valve and slewing directional control valve is also provided with one-way valve.One-way valve for being communicated with the filler opening of external fuel feeding and corresponding selector valve to realize fuel feeding, and can prevent interfering with each other between oil circuit.
In another embodiment, described master winch selector valve, flexible selector valve, slewing directional control valve, secondary elevator selector valve and luffing selector valve are three six logical hand-operated direction valves.Each selector valve in lorry-mounted crane multi-way reversing device of the present invention all can adopt three six logical hand-operated direction valves, and rely on stick control, regulating spool stroke, realizes throttle grverning, has the features such as adjustment stroke is long, structure is simple, versatility is good, cost is low.
In another embodiment, the return opening of the valve body that described master winch selector valve is corresponding is double back hydraulic fluid port arranged side by side.Double back hydraulic fluid port replaces a large return opening, can reduce connecting pipeline specification, reduces the thickness of the valve body corresponding to master winch selector valve.
In another embodiment, described luffing selector valve, flexible selector valve, master winch selector valve, slewing directional control valve and valve body corresponding to secondary elevator selector valve superpose assembling in order, second oil-feed connection of the first oil-feed connection being also separately installed with the valve body of employing first specification in both sides and the valve body adopting the second specification, described first oil-feed connection comprises the first main relief valve, first pressure oil port and the first pressure tap, described first pressure oil port communicates with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, the external pressure measuring element of described first pressure tap, described first main relief valve is arranged on described first pressure oil port and between described luffing selector valve and the oil return circuit of flexible selector valve, described second oil-feed connection comprises the second main relief valve, second pressure oil port and the second pressure tap, described second pressure oil port communicates with the oil-feed oil circuit of described secondary elevator selector valve and slewing directional control valve, the external pressure measuring element of described second pressure tap, described second main relief valve is arranged on described second pressure oil port and between described secondary elevator selector valve and the oil return circuit of slewing directional control valve.By arranging two the oil-feed connection comprising main relief valve, pressure oil port and pressure tap, oil-feed oil circuit and safety protection function can be provided, and external pressure measuring element can be utilized to monitor oil circuit pressure.
For achieving the above object, present invention also offers a kind of straight-arm lorry-mounted crane, comprise aforesaid lorry-mounted crane multi-way reversing device.The straight-arm lorry-mounted crane that have employed aforesaid lorry-mounted crane multi-way reversing device can realize valve front interflow control form at lower cost, improves the operating efficiency of car load.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of existing a kind of straight-arm Multi-way directional valve for lorry-mounted crane.
Fig. 2 is the hydraulic principle schematic diagram of an embodiment of lorry-mounted crane multi-way reversing device of the present invention.
Fig. 3,4 is respectively the structural representation of valve body structure under different visual angles of lorry-mounted crane multi-way reversing device embodiment of the present invention.
Embodiment
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
As shown in Figure 2, be the hydraulic principle schematic diagram of an embodiment of lorry-mounted crane multi-way reversing device of the present invention.In the present embodiment, lorry-mounted crane multi-way reversing device comprises: master winch selector valve 42, flexible selector valve 32, slewing directional control valve 52 and luffing selector valve 22, luffing selector valve 22 and flexible selector valve 32 are in parallel on oil-feed oil circuit, and external first quantitative oil pump of oil-feed oil circuit, external second quantitative oil pump of oil-feed oil circuit of slewing directional control valve 52.
The oil-feed oil circuit of slewing directional control valve 52 collaborates to connect on oil-feed oil circuit with master winch selector valve 42 afterwards with the oil-feed oil circuit of luffing selector valve 22 and flexible selector valve 32, position on the oil-feed oil circuit of slewing directional control valve 52 before junction of two streams is also provided with interflow one-way valve 45, all external fuel tank of oil return circuit of master winch selector valve 42, flexible selector valve 32, slewing directional control valve 52 and luffing selector valve 22.As we can see from the figure, before junction of two streams is positioned at the filler opening of master winch selector valve 42, thus interflow before achieving valve, collaborate compared to after valve, decrease restriction loss, reduce energy consumption, and based on two metering pump fuel feeding, the principle at interflow before master winch valve, and then achieve luffing and master winch, luffing and revolution, stretch and revolution, the multiple composite move such as master winch and revolution, composite move is realized without the need to proportional multi-way valve, also without the need to adopting special liquid controling element to control, effectively reduce the cost, improve the cost performance of straight-arm lorry-mounted crane, be applicable to the market orientation of straight-arm lorry-mounted crane.
Here the first quantitative oil pump can select huge discharge metering pump, the huge discharge needs of luffing, flexible and master winch action can be met, and the small displacement metering pump that the second quantitative oil pump can select discharge capacity less, the huge discharge needs of revolution and secondary elevator action can be met.
In fig. 2, lorry-mounted crane multi-way reversing device can also comprise secondary elevator selector valve 62, and secondary elevator selector valve 62 and slewing directional control valve 52 are in parallel on oil-feed oil circuit.Secondary elevator selector valve can be used alone the little weight object of lift up rapidly, also with master winch with the use of lifting by crane special object, thus can expand the operation function of straight-arm lorry-mounted crane.In another embodiment, if straight-arm lorry-mounted crane does not configure secondary elevator, then lorry-mounted crane multi-way reversing device also can not comprise the valve body, auxiliary plug-in etc. of secondary elevator selector valve and correspondence.
Master winch selector valve 42, flexible selector valve 32 and luffing selector valve 22 can adopt the valve body of the first specification, secondary elevator selector valve 62 and slewing directional control valve 52 then can adopt the valve body of the second specification, these two kinds of specifications are different, corresponding with the discharge capacity of the first quantitative oil pump and the second quantitative oil pump respectively.As can be seen from Fig. 3,4, master winch selector valve 42, flexible selector valve 32 are different from the specification of the valve body corresponding to secondary elevator selector valve 62 and slewing directional control valve 52 with the valve body corresponding to luffing selector valve 22.
Auxiliary plug-in can also be set in the valve body corresponding to each selector valve to play easy motion, to reduce the effect such as energy consumption, safety protection, promote the control performance of selector valve.Composition graphs 2-4 is described respectively below.
The valve body 4 of master winch selector valve 42 and correspondence is mainly used in the rising of master winch and the control that declines, and valve body 4 is applicable to the valve body adopting the first larger specification, meets the large discharge demand of large-tonnage straight-arm lorry-mounted crane, reduces restriction loss, reduces system and generates heat.Return opening can be arranged to double back hydraulic fluid port T1 and T2 arranged side by side, and connects oil return circuit to fuel tank.By double back hydraulic fluid port being replaced a large return opening, effectively can utilize the vertical area of valve body 4, reducing the thickness of valve body 4, reducing connecting pipeline specification simultaneously, can support to connect compared with the pipeline of small dimension, be conducive to line arrangement.Master winch selector valve 42 can adopt three six logical hand-operated direction valves, there is three, upper, middle and lower working position, correspond respectively to the rising of main winch motor, stopping and decline three kinds of actions, and operator can rely on handle to carry out manual control, regulating spool stroke, realize throttle grverning, control the rotational velocity of main winch motor.
The valve body 4 of master winch selector valve 42 correspondence is also provided with rise secondary valve 43 and master winch of master file to fall time step valve 44, the actuator port A3 of valve body 4 and actuator port B3 be the rising chamber of external main winch motor and decline chamber respectively, and two of master winch selector valve 42 actuator ports communicate with the actuator port A3 of valve body 4 and actuator port B3 respectively.The master file secondary valve 43 that rises is connected between actuator port A3 and return opening, and the master winch time step valve 44 that falls then is connected between actuator port B3 and return opening.Master file secondary valve 43 and the master winch time step valve 44 that falls that rises is auxiliary plug-in in valve body 4, and the Maximum operating pressure that can limit main winch motor is no more than the authorized pressure of main winch motor.
In valve body 4 master winch selector valve 42 filler opening before oil-feed oil circuit on can also be provided with master winch one-way valve 41, this master winch one-way valve 41 unilaterally connected stretches the meta return opening of selector valve 32 and the filler opening of master winch selector valve 42, realize the fuel feeding of huge discharge metering pump to valve body 4, and can prevent oil circuit from mutually disturbing.And collaborate one-way valve 45 and also can be arranged in valve body 4, the meta return opening of unilaterally connected slewing directional control valve 52 and the filler opening of master winch selector valve 42, realize the fuel feeding of small displacement metering pump to valve body 4, and prevent oil circuit from interfering with each other.
The valve body 2 of luffing selector valve 22 correspondence is mainly used in the rising of amplitude oil cylinder, falls to controlling, the valve body of the first specification that applicable employing is larger, to meet the large discharge demand of large-tonnage straight-arm lorry-mounted crane, reduces restriction loss, reduces system heating.Luffing selector valve 22 can adopt three six logical hand-operated direction valves, there is three, upper, middle and lower working position, correspond respectively to the three kinds of actions that hoist, stop and falling back of amplitude oil cylinder, and operator can rely on handle to carry out manual control, regulating spool stroke, a part of fluid of the supply of huge discharge metering pump can enter into amplitude oil cylinder by luffing selector valve 22, and other fluid can overflow back fuel tank, and then controls the movement velocity of amplitude oil cylinder.
In valve body 2 luffing selector valve 22 filler opening before oil-feed oil circuit on can also be provided with luffing one-way valve 21, the filler opening of this luffing one-way valve 21 unilaterally connected huge discharge metering pump and luffing selector valve 22, realize the fuel feeding of huge discharge metering pump to valve body 2, and can prevent oil circuit from mutually disturbing.
Compared with truck crane, straight-arm lorry-mounted crane operating speed is fast, easily produces vibration and impacts, can rock jib, reduce overall operation performance, destroy hydraulic pipe line when operation process and startup, stopping, and damage structural member.In order to avoid these problems, the valve body 2 of luffing selector valve 22 correspondence can also be arranged the large chamber of luffing time step valve 24, luffing loculus time step valve 25, the empty valve of the anti-suction in the large chamber of luffing 23 and the empty valve 26 of the anti-suction of luffing loculus.The actuator port A1 of valve body 2 and actuator port B1 be the large chamber (i.e. rodless cavity) of external amplitude oil cylinder and loculus (i.e. rod chamber) respectively, and two of luffing selector valve 22 actuator ports communicate with the actuator port A1 of valve body 2 and actuator port B1 respectively.The large chamber of luffing time step valve 24 is connected between the actuator port A1 of valve body 2 and the return opening of valve body 4, luffing loculus time step valve 25 is connected between the actuator port B1 of valve body 2 and the return opening of valve body 4, the empty valve of the anti-suction in the large chamber of luffing 23 is in parallel with the large chamber of luffing time step valve 24, and the empty valve of the anti-suction of luffing loculus 26 is in parallel with luffing loculus time step valve 25.
The large chamber of luffing time step valve 24, luffing loculus time step valve 25, the empty valve of the anti-suction in the large chamber of luffing 23 and the empty valve 26 of the anti-suction of luffing loculus are the auxiliary plug-in in valve body 2, and acting in conjunction improves luffing control performance.In motion and braking process, high-voltage oil liquid is allowed to be overflowed by the large chamber of luffing time step valve 24 and luffing loculus time step valve 25, the fluid of oil return simultaneously directly enters the oil cylinder chamber of vacuum through the empty valve of the anti-suction in the large chamber of luffing 23 and the empty valve 26 of the anti-suction of luffing loculus, prevent the generation of vacuum, avoid the generation of repeatedly hydraulic shock, thus serve the effect of buffering step-down, thus make luffing action movement steadily, impact less.
The large chamber of luffing time step valve 24 is antivibration time step valve, for controlling the large cavity pressure of amplitude oil cylinder, on the one hand when amplitude oil cylinder is vibrated; generated heat by overflow, reach the object of vibration damping, on the other hand by its setting pressure; the maximum lifting capacity of restriction luffing, realizes system protection function.Luffing loculus time step valve 25 is antivibration time step valve, for controlling the little cavity pressure of amplitude oil cylinder, increases pressure surge when hydraulic system damping reduction is retracted on the one hand by overflow, ensures that oil liquid pressure is enough large to realize unloaded retraction on the other hand.As can be seen from Figure 3, because valve body 2 is large gauge valve body, auxiliary plug-in mounting hole is larger, the empty valve of the anti-suction in the large chamber of luffing 23, the large chamber of luffing time step valve 24 are as a whole, be arranged on the downside of valve body 2, luffing loculus time step valve 25 and the anti-suction of luffing loculus empty valve 26 as a whole, be arranged on the upside of valve body 2.
The valve body 3 of flexible selector valve 32 correspondence is mainly used in the stretching out of telescopic oil cylinder, controls of retracting, and the valve body of the first specification that applicable employing is larger, to meet the large discharge demand of large-tonnage straight-arm lorry-mounted crane, reduces restriction loss, and minimizing system is generated heat.Flexible selector valve 32 can adopt three six logical hand-operated direction valves, there is three, upper, middle and lower working position, correspond respectively to three kinds of actions of stretching out, stop and retracting of telescopic oil cylinder, and operator can rely on handle to carry out manual control, regulating spool stroke, realize throttle grverning, and then control the movement velocity of telescopic oil cylinder.
In valve body 3 flexible selector valve 32 filler opening before oil-feed oil circuit on can also be provided with flexible one-way valve 31, the filler opening of this flexible one-way valve 31 unilaterally connected huge discharge metering pump and flexible selector valve 32, realize the fuel feeding of huge discharge metering pump to valve body 3, and can prevent oil circuit from mutually disturbing.
Valve body 3 can be arranged flexible large chamber time step valve 33 and flexible loculus time step valve 34, the actuator port A2 of valve body 3 and actuator port B2 be the large chamber (i.e. rodless cavity) of external telescopic oil cylinder and loculus (i.e. rod chamber) respectively, and two actuator ports of the selector valve 32 that stretches communicate with the actuator port A2 of valve body 3 and actuator port B2 respectively.Flexible large chamber time step valve 33 is connected between the return opening of actuator port A2 and valve body 4, and flexible loculus time step valve 34 is connected between the return opening of actuator port B2 and valve body 4.
Flexible large chamber time step valve 33 and flexible loculus time step valve 34 are the auxiliary plug-in in valve body 3, for improving telescopic control function.Flexible large chamber time step valve 33 is secondary pressure-limit valve; for limiting the large cavity pressure of telescopic oil cylinder; the band that will meet straight-arm lorry-mounted crane on the one hand carries Telescopic requirement; limit again on the other hand straight-arm lorry-mounted crane band and carry the allowed band of flexible ability at telescopic oil cylinder and boom structure, protective system.The rated pressure can selecting flexible large chamber time step valve 33 when reality uses is 16 ~ 23MPa.Flexible loculus time step valve 34 is also secondary pressure-limit valve, for limiting the little cavity pressure of telescopic oil cylinder, increase pressure surge when hydraulic system damping reduction is retracted by overflow and utilize load deadweight to realize arm on the one hand and retract, thus improve robust motion, reduction energy consumption, need on the other hand to ensure that oil liquid pressure is enough large, to realize unloaded retraction.
The valve body 5 of slewing directional control valve 52 correspondence is mainly used in pivotal forward, multi channel, the valve body of the second specification that applicable employing is less.Slewing directional control valve 52 can adopt three six logical hand-operated direction valves, there is three, upper, middle and lower working position, correspond respectively to the forward of rotary motor, stopping and reverse three kinds of actions, and operator can rely on handle to carry out manual control, regulating spool stroke, realize throttle grverning, and then control the movement velocity of rotary motor.
In valve body 5 slewing directional control valve 52 filler opening before oil-feed oil circuit on can also be provided with revolution one-way valve 51, the filler opening of this revolution one-way valve 51 unilaterally connected small displacement metering pump and slewing directional control valve 52, realize the fuel feeding of small displacement metering pump to valve body 5, and can prevent oil circuit from mutually disturbing.
Valve body 5 can be arranged the just secondary step valve 53 of revolution and the inverse time step valve 54 of revolution, the actuator port A4 of valve body 5 and actuator port B4 be the forward chamber of external rotary motor and reverse chamber respectively, and two of slewing directional control valve 52 actuator ports communicate with the actuator port A4 of valve body 5 and actuator port B4 respectively.Turn round just secondary step valve 53 to be connected between the return opening of actuator port A4 and valve body 4, and the inverse time step valve 54 of revolution is connected between the return opening of actuator port B4 and valve body 4.Turning round just secondary step valve 53 and the inverse time step valve 54 of revolution is auxiliary plug-in in valve body 5, for improving revolution controlling functions.
The valve body 6 of secondary elevator selector valve 62 correspondence is mainly used in rising, the decline control of secondary elevator, the valve body of the second specification that applicable employing is less.Secondary elevator selector valve 62 can adopt three six logical hand-operated direction valves, there is three, upper, middle and lower working position, correspond respectively to the rising of secondary hoist motor, stopping and decline three kinds of actions, and operator can rely on handle to carry out manual control, regulating spool stroke, realize throttle grverning, and then control the movement velocity of secondary hoist motor.
In valve body 6 secondary elevator selector valve 62 filler opening before oil-feed oil circuit on can also be provided with secondary elevator one-way valve 61, the filler opening of this secondary elevator one-way valve 61 unilaterally connected small displacement metering pump and secondary elevator selector valve 62, realize the fuel feeding of small displacement metering pump to valve body 6, and can prevent oil circuit from mutually disturbing.
Valve body 6 can be arranged secondary elevator to rise time step valve 63 and secondary elevator and to fall time step valve 64, the actuator port A5 of valve body 6 and actuator port B5 be the rising chamber of external secondary hoist motor and decline chamber respectively, and two actuator ports of secondary elevator selector valve 62 communicate with the actuator port A5 of valve body 6 and actuator port B5 respectively.Secondary elevator rises time step valve 63 and is connected between the return opening of actuator port A5 and valve body 4, and the secondary elevator time step valve 64 that falls is connected between the return opening of actuator port B5 and valve body 4.It is auxiliary plug-in in valve body 6 that secondary elevator rises time step valve 63 and the secondary elevator time step valve 64 that falls, and the Maximum operating pressure for limiting secondary hoist motor is no more than the authorized pressure of motor.
The valve body 2-6 of luffing selector valve 22 mentioned above, flexible selector valve 32, master winch selector valve 42, slewing directional control valve 52 and secondary elevator selector valve 62 correspondence can superpose assembling in order; and the first oil-feed connection 1 of the valve body of employing first specification can be separately installed with in both sides and adopt the second oil-feed of the valve body of the second specification to join 2, to provide oil-feed oil circuit and safety protection function.
First oil-feed connection 1 comprises the first main relief valve 11, first pressure oil port P1 and the first pressure tap MP1, first pressure oil port P1 communicates with the oil-feed oil circuit of luffing selector valve 22 and flexible selector valve 32, and can external huge discharge metering pump, first pressure tap MP1 can external pressure measuring element, monitors oil circuit pressure.First main relief valve 11 is arranged between the oil return circuit of the first pressure oil port P1 and luffing selector valve 22 and flexible selector valve 32.First oil-feed connection 1 adopts large gauge valve body, and its first pressure oil port P1 adopts huge discharge metering pump fuel feeding, meets the traffic demand of luffing, flexible and master winch.Second main relief valve 11 can realize overload protection, the maximum pressure of restriction luffing, flexible and master winch.
Second oil-feed connection 7 comprises the second main relief valve 71, second pressure oil port P2 and the second pressure tap MP2, the second pressure oil port P2 and communicates with the oil-feed oil circuit of secondary elevator selector valve 62 and slewing directional control valve 52, and can external small displacement metering pump.Second pressure tap MP2 can external pressure measuring element, monitors oil circuit pressure.Second main relief valve 71 is arranged on the second pressure oil port P2 and between secondary elevator selector valve 62 and the oil return circuit of slewing directional control valve 52.Second oil-feed connection 7 adopts small dimension valve body, and its second pressure oil port P2 adopts small displacement metering pump fuel feeding, meets the traffic demand of revolution, secondary elevator, reaches again the requirement reducing costs, reduce multi-way valve weight.Second main relief valve 71 can realize overload protection, the maximum pressure of restriction revolution, secondary elevator.
Lorry-mounted crane multi-way reversing device of the present invention can realize luffing and master winch, luffing and revolution, luffing and secondary elevator, flexible with master winch, flexible with turn round, stretch and secondary elevator, master winch and revolution and multiple composite move such as master winch and secondary elevator.And when master winch single movement, the interflow fuel feeding of huge discharge metering pump and small displacement metering pump can be realized, to realize rapid movement.Its working principle is specific as follows:
1, Dual-pump flow-converging: when luffing, flexible, revolution and secondary elevator are static, namely when the selector valve of its correspondence is all in meta, huge discharge metering pump is through the meta oil circuit of the first pressure oil port P1, luffing selector valve 22, the meta oil circuit of flexible selector valve 32 and master winch one-way valve 41 to master winch selector valve 42 fuel feeding, and small displacement metering pump is through the second pressure oil port P2, the meta oil circuit of secondary elevator selector valve 62, the meta oil circuit of slewing directional control valve 52 and collaborate one-way valve 45 to master winch selector valve 42 fuel feeding.The pressure oil liquid of two metering pumps realizes interflow through master winch one-way valve 41, interflow one-way valve 45 respectively before the filler opening of master winch selector valve 42.When master winch is failure to actuate, collaborate the meta oil circuit of fluid through master winch selector valve 42 through double back hydraulic fluid port T1, T2 mouth oil sump tank; When master winch action, interflow fluid supplies main winch motor through master winch selector valve 42, and realize high-speed motion, its maximum allowble pressure is limited by the rated pressure of the main relief valve 71 of the first main relief valve 11, second respectively.
2, composite move: when luffing or flexible have an action time, huge discharge metering pump supplies corresponding selector valve through the first pressure oil port P1, first pressure oil port P1 disconnects to the oil circuit of master winch one-way valve 41, now, small displacement metering pump supplies valve body 6, valve body 5 and valve body 4 through the second pressure oil port P2, thus can realize luffing and master winch, luffing and revolution, luffing and secondary elevator, flexible with master winch, flexible with turn round and stretch and secondary elevator totally six composite moves, now master winch is small displacement metering pump fuel feeding; When revolution or secondary elevator action, small displacement pump supplies corresponding selector valve through the second pressure oil port P2, first pressure oil port P1 disconnects to the oil circuit of interflow one-way valve 45, now, huge discharge metering pump supplies valve body 2, valve body 3 and valve body 4 through the first pressure oil port P1, thus secondary elevator and master winch, secondary elevator and flexible, secondary elevator and master winch can be realized, turn round and master winch, turn round and stretch and turn round and luffing totally six composite moves, now master winch is large discharge pump fuel feeding.
Above-mentioned lorry-mounted crane multi-way reversing device embodiment of the present invention is applicable to being applied in straight-arm lorry-mounted crane, especially there is large tonnage straight-arm lorry-mounted crane, and the straight-arm lorry-mounted crane that have employed aforesaid lorry-mounted crane multi-way reversing device embodiment collaborates control form before can realizing valve at lower cost, improve the operating efficiency of car load.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope of request of the present invention protection.
Claims (10)
1. a lorry-mounted crane multi-way reversing device, comprise: master winch selector valve, flexible selector valve, slewing directional control valve and luffing selector valve, described luffing selector valve and flexible selector valve are in parallel on oil-feed oil circuit, and external first quantitative oil pump of oil-feed oil circuit, external second quantitative oil pump of oil-feed oil circuit of described slewing directional control valve, it is characterized in that, the oil-feed oil circuit of described slewing directional control valve collaborates to connect on oil-feed oil circuit with described master winch selector valve afterwards with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, position on the oil-feed oil circuit of described slewing directional control valve before junction of two streams is also provided with interflow one-way valve,
Oil-feed oil circuit before the filler opening of described master winch selector valve is also provided with master winch one-way valve;
Described master winch selector valve adopts three six logical hand-operated direction valves;
After the interflow of described interflow one-way valve, the oil return circuit of described master winch selector valve is through the meta oil return of described master winch selector valve.
2. lorry-mounted crane multi-way reversing device according to claim 1, is characterized in that, the discharge capacity of described first quantitative oil pump is greater than the discharge capacity of described second quantitative oil pump.
3. lorry-mounted crane multi-way reversing device according to claim 2, is characterized in that, also comprise: secondary elevator selector valve, and described secondary elevator selector valve and described slewing directional control valve are in parallel on oil-feed oil circuit.
4. lorry-mounted crane multi-way reversing device according to claim 3, it is characterized in that, described master winch selector valve, flexible selector valve and luffing selector valve adopt the valve body of the first specification, described secondary elevator selector valve and slewing directional control valve adopt the valve body of the second specification, the valve body of described first specification is corresponding with the discharge capacity of described first quantitative oil pump, and the valve body of described second specification is corresponding with the discharge capacity of described second quantitative oil pump.
5. lorry-mounted crane multi-way reversing device according to claim 4, it is characterized in that, the valve body that described luffing selector valve is corresponding is also provided with the large chamber of luffing time step valve, luffing loculus time step valve, the empty valve of the anti-suction in the large chamber of luffing and the empty valve of the anti-suction of luffing loculus, the large chamber of two external amplitude oil cylinder of actuator ports difference of the valve body that described luffing selector valve is corresponding and loculus, between the return opening of the valve body that two actuator ports that the large chamber of described luffing time step valve and the secondary step valve of luffing loculus are connected on valve body corresponding to described luffing selector valve are respectively corresponding with described master winch selector valve, the empty valve of the anti-suction in the large chamber of described luffing is in parallel with the large chamber of described luffing time step valve, the empty valve of the anti-suction of described luffing loculus is in parallel with described luffing loculus time step valve.
6. lorry-mounted crane multi-way reversing device according to claim 4, it is characterized in that, the valve body that described flexible selector valve is corresponding is also provided with flexible large chamber time step valve and flexible loculus time step valve, the large chamber of two external telescopic oil cylinders of actuator ports difference of the valve body that described flexible selector valve is corresponding and loculus, between the return opening of the valve body that two actuator ports that described flexible large chamber time step valve and the secondary step valve of flexible loculus are connected on valve body corresponding to described flexible selector valve are respectively corresponding with described master winch selector valve.
7. according to the arbitrary described lorry-mounted crane multi-way reversing device of claim 3 ~ 6, it is characterized in that, the oil-feed oil circuit before the filler opening of described flexible selector valve, luffing selector valve, master winch selector valve, secondary elevator selector valve and slewing directional control valve is also provided with one-way valve.
8. the lorry-mounted crane multi-way reversing device according to claim 5 or 6, is characterized in that, the return opening of the valve body that described master winch selector valve is corresponding is double back hydraulic fluid port arranged side by side.
9. according to the arbitrary described lorry-mounted crane multi-way reversing device of claim 4 ~ 6, it is characterized in that, described luffing selector valve, flexible selector valve, master winch selector valve, slewing directional control valve and valve body corresponding to secondary elevator selector valve superpose assembling in order, second oil-feed connection of the first oil-feed connection being also separately installed with the valve body of employing first specification in both sides and the valve body adopting the second specification, described first oil-feed connection comprises the first main relief valve, first pressure oil port and the first pressure tap, described first pressure oil port communicates with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, the external pressure measuring element of described first pressure tap, described first main relief valve is arranged on described first pressure oil port and between described luffing selector valve and the oil return circuit of flexible selector valve, described second oil-feed connection comprises the second main relief valve, second pressure oil port and the second pressure tap, described second pressure oil port communicates with the oil-feed oil circuit of described secondary elevator selector valve and slewing directional control valve, the external pressure measuring element of described second pressure tap, described second main relief valve is arranged on described second pressure oil port and between described secondary elevator selector valve and the oil return circuit of slewing directional control valve.
10. a straight-arm lorry-mounted crane, is characterized in that, comprises the arbitrary described lorry-mounted crane multi-way reversing device of claim 1 ~ 9.
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| CN105987037B (en) * | 2015-02-15 | 2018-07-17 | 徐工集团工程机械股份有限公司 | Control valve, control connection, proportional multi-way valve and the crane of proportional multi-way valve |
| WO2017006417A1 (en) * | 2015-07-06 | 2017-01-12 | 株式会社 島津製作所 | Fluid control device |
| CN107504000B (en) * | 2017-10-12 | 2024-01-02 | 徐州徐工随车起重机有限公司 | Multi-way reversing device of lorry-mounted crane |
| CN108050118A (en) * | 2017-12-06 | 2018-05-18 | 徐州重型机械有限公司 | A kind of main valve and its hydraulic control system |
| CN108516465A (en) * | 2018-06-01 | 2018-09-11 | 浙江三装备有限公司 | hydraulic system and crane |
| CN111677713B (en) * | 2020-05-19 | 2022-05-10 | 徐州徐工随车起重机有限公司 | Confluence proportion multi-way reversing valve for straight-arm lorry-mounted crane and working method |
| CN115095564A (en) * | 2022-06-20 | 2022-09-23 | 潍柴动力股份有限公司 | Hydraulic speed regulation system and method |
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| CN2172364Y (en) * | 1993-09-22 | 1994-07-20 | 肇州液压件厂 | Pressure adaptation multi-way orientable valve |
| CN2512653Y (en) * | 2001-08-14 | 2002-09-25 | 同济大学 | Full hydraulic electric forklift multiple-way valve |
| JP4163886B2 (en) * | 2002-03-20 | 2008-10-08 | 株式会社タダノ | Crane hook horizontal movement control device |
| CN2890448Y (en) * | 2005-12-08 | 2007-04-18 | 常德信诚液压有限公司 | Hydraulic combined control valve |
| CN201228685Y (en) * | 2008-05-26 | 2009-04-29 | 长治清华机械厂 | Hydraulic system of lorry-mounted crane |
| CN101373027B (en) * | 2008-08-08 | 2010-08-25 | 锦州市力特缸泵阀液压制造有限公司 | Multi-way change valve |
| CN202108803U (en) * | 2011-06-22 | 2012-01-11 | 徐州徐工随车起重机有限公司 | Multi-way reversing valve for lorry-mounted crane |
| CN102278331A (en) * | 2011-06-22 | 2011-12-14 | 徐州徐工随车起重机有限公司 | Multi-way directional valve for lorry-mounted crane and control method thereof |
| CN203717509U (en) * | 2014-01-17 | 2014-07-16 | 徐州徐工随车起重机有限公司 | Lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane |
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