CN103899588A - 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 PDF

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Publication number
CN103899588A
CN103899588A CN201410023523.8A CN201410023523A CN103899588A CN 103899588 A CN103899588 A CN 103899588A CN 201410023523 A CN201410023523 A CN 201410023523A CN 103899588 A CN103899588 A CN 103899588A
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valve
selector valve
luffing
oil
lorry
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CN103899588B (en
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程磊
满军
陈磊
陈志伟
韩文超
林小波
商晓恒
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Xuzhou XCMG Truck Mounted Crane Co Ltd
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Xuzhou XCMG Truck Mounted Crane Co Ltd
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Abstract

The invention relates to a lorry-mounted crane multi-way reversing device and a straight arm lorry-mounted crane. The lorry-mounted crane multi-way reversing device comprises a main winch reversing valve, a telescopic reversing valve, a rotary reversing valve and an amplitude variation reversing valve, the amplitude variation reversing valve and the telescopic reversing valve are in parallel connection on an input oil way, the input oil way is connected with an external first quantitative oil pump, an input oil way of the rotary reversing valve is connected with an external second quantitative oil pump, wherein the input oil way of the rotary reserving valve and the input oil way of the amplitude variation reversing valve and the telescopic reversing valve converges to be in series connection with the main winch reversing valve on the input oil way, and a converge check valve is further arranged at the position before the converging point on the input oil way of the rotary reversing valve. According to the lorry-mounted crane multi-way reversing device and the straight arm lorry-mounted crane, the pre-valve converging control form can be achieved with low cost, and operation efficiency of the whole crane is improved.

Description

Lorry-mounted crane multi-way reversing device and straight-arm lorry-mounted crane
Technical field
The present invention relates to engineering machinery field, relate in particular 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, load and unload within the specific limits many action machineries of weight, there is feature quick, flexible, efficient, convenient, that collection handling transportation unites two into one, be widely used in the field such as lifting and transportation of urban construction, colliery engineering, afforestation and equipment.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 stretch out arm by the telescopic oil cylinder of arm or retract, the wire rope of being drawn by hoisting mechanism can be mentioned goods, main action comprises luffing, flexible, elevator and revolution etc., there is the advantages such as simple to operate, applied widely, Security is high, be used widely in China, account for more than 80% market share.In recent years, along with the development of market, technology, large-tonnage, Energy Saving Control, modularization, the multi-functional technology trends that becomes straight-arm lorry-mounted crane.
Multi-way valve is the core parts of straight-arm lorry-mounted crane hydraulic control system, and its principle has directly determined performance, efficiency, energy consumption and the cost of complete machine.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, realized interlock and the action of elevator double speed of part action, thereby promoted hydraulic system performance with lower cost.But this multiple directional control valve still exists a lot of technological deficiencies, as follows:
1, rolling control connection adopts the principle of collaborating after valve, and little oil pump feed first passes through elevator selector valve, and then collaborates with large oil pump feed, and through selector valve often, restriction loss is large for fluid, and energy consumption is high, causes car load operating efficiency low;
2, elevator selector valve is five eight logical structural types, 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, versatility is poor, cost is high and the problem such as maintenance difficult;
3, the large oil pump feed side of elevator selector valve, without one-way valve, can not prevent hydraulic shock refluence, has weakened hydraulic control system reliability;
4, to control the Dimensions of connection identical for flexible, luffing and revolution, can not meet different this contradiction of through-current capability of the difference commutation connection that heavy tonnage lorry-mounted crane is flexible, the required flow of 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, have the problems such as robust motion is poor, safety protection is not enough in operation process, and control performance still has much room for improvement.
In addition, also there is at present the interflow multi-way valve for truck crane that adopts special hydraulic control converging valve, interflow control mode before the valve of employing, the interflow of having realized flexible, luffing and flexible luffing composite move, has significantly improved the operating efficiency of car load.But this interflow multi-way valve is load sensing multi-way valve, and the liquid controling element control that interflow need to be special, guide's oil circuit complexity, 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, can realize at lower cost the front interflow of valve control form, 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 the 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 is connected with described master winch selector valve with behind the oil-feed oil circuit of described luffing selector valve and flexible selector valve interflow on oil-feed oil circuit, 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 the first quantitative oil pump is greater than the discharge capacity of described the 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 the first specification is corresponding with the discharge capacity of described the first quantitative oil pump, and the valve body of described the second specification is corresponding with the discharge capacity of described the second quantitative oil pump.
Further, on valve body corresponding to described luffing selector valve, be 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, two actuator ports of the valve body that described luffing selector valve is corresponding large chamber and loculus of external amplitude oil cylinder respectively, the large chamber of described luffing time step valve and luffing loculus time step valve is connected on respectively between two actuator ports of the valve body that described luffing selector valve is corresponding and the return opening of valve body corresponding to 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, on valve body corresponding to described flexible selector valve, be also provided with flexible large chamber time step valve and flexible loculus time step valve, two actuator ports of the valve body that described flexible selector valve is corresponding are large chamber and the loculus of external telescopic oil cylinders respectively, and described flexible large chamber time step valve and flexible loculus time step valve are connected on respectively between two actuator ports of the valve body that described flexible selector valve is corresponding and the return opening of valve body corresponding to described master winch selector valve.
Further, on 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, be also provided with one-way valve.
The return opening of the valve body that further, 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, the assembling that superposes in order of slewing directional control valve and valve body corresponding to secondary elevator selector valve, also be separately installed with the first oil-feed connection of the valve body that adopts the first specification in both sides and adopt the second oil-feed of the valve body of the second specification to join, described the first oil-feed connection comprises the first main relief valve, the first pressure hydraulic fluid port and the first pressure tap, described the first pressure hydraulic fluid port communicates with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, the external pressure measuring element of described the first pressure tap, described the first main relief valve is arranged between described the first pressure hydraulic fluid port and described luffing selector valve and the oil return circuit of flexible selector valve, described the second oil-feed connection comprises the second main relief valve, the second pressure hydraulic fluid port and the second pressure tap, described the second pressure hydraulic fluid 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 the second pressure tap, described the second main relief valve is arranged between described the second pressure hydraulic fluid port and described secondary elevator selector valve and the oil return circuit of slewing directional control valve.
Based on technique scheme, master winch selector valve of the present invention has adopted the mode of collaborating before valve, make to connect on oil-feed oil circuit with described master winch selector valve behind the oil-feed oil circuit of slewing directional control valve and the oil-feed oil circuit of luffing selector valve and flexible selector valve interflow, and by interflow one-way valve unilaterally connected the second quantitative oil pump and master winch selector valve, make two corresponding oil feeding lines of quantitative oil pump before master winch selector valve, realize interflow by this structure, interflow fluid is supplied with master winch motor through master winch selector valve, realize the high-speed motion of master winch motor, than confluent structure after valve, reduce restriction loss, reduce energy consumption, in addition, because interflow before valve of the present invention is controlled without special liquid controling element, simple in structure, with low cost, be applicable to the market orientation of straight-arm lorry-mounted crane.
In another embodiment, the discharge capacity of described the first quantitative oil pump is greater than the discharge capacity of described the second quantitative oil pump.Consider that luffing in straight-arm lorry-mounted crane, hydraulic fluid flow rate demand 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 external quantitative oil pump is also different separately, select the first quantitative oil pump of relatively large discharge capacity, and the second quantitative oil pump of small displacement relatively.
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 be controlled secondary hoist motor, can use separately the object of lift up rapidly lower weight, can also be used in conjunction with the special object of lifting with master winch, thereby has expanded 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 the first specification is corresponding with the discharge capacity of described the first quantitative oil pump, and the valve body of described the second specification is corresponding with the discharge capacity of described the 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 performing an action, and can reduce costs again.
In another embodiment, on valve body corresponding to described master winch selector valve, be also provided with master file secondary valve and the master winch time step valve that falls that rises, two actuator ports of the valve body that described master winch selector valve is corresponding are rising chamber and the decline chamber of external master winch motors respectively, and described master file secondary valve and the master winch time step valve that falls that rises is connected on respectively between two actuator ports and return opening of valve body that described master winch selector valve is corresponding.Master file secondary valve and the master winch time step valve that falls that rises is the auxiliary plug-in in the valve body that master winch selector valve is corresponding, and the Maximum operating pressure that can limit master winch motor is no more than the authorized pressure of master winch motor.
In another embodiment, on valve body corresponding to described luffing selector valve, be 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, two actuator ports of the valve body that described luffing selector valve is corresponding large chamber and loculus of external amplitude oil cylinder respectively, the large chamber of described luffing time step valve and luffing loculus time step valve is connected on respectively between two actuator ports of the valve body that described luffing selector valve is corresponding and the return opening of valve body corresponding to 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 the valve body that luffing selector valve is corresponding, and acting in conjunction improves luffing control performance.In motion and braking process, allow high-voltage oil liquid overflow 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, thereby played the effect of buffering step-down, thus make luffing action movement steadily, impact less.
In another embodiment, on valve body corresponding to described flexible selector valve, be also provided with flexible large chamber time step valve and flexible loculus time step valve, two actuator ports of the valve body that described flexible selector valve is corresponding are large chamber and the loculus of external telescopic oil cylinders respectively, and described flexible large chamber time step valve and flexible loculus time step valve are connected on respectively between two actuator ports of the valve body that described flexible selector valve is corresponding and the return opening of valve body corresponding to described master winch selector valve.Flexible large chamber time step valve and flexible loculus time step valve are the auxiliary plug-in in the 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 on the one hand straight-arm lorry-mounted crane 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, on the one hand increasing hydraulic system damping by overflow reduces the pressure surge while retracting and utilizes load deadweight to realize arm retraction, thereby improve robust motion, reduce energy consumption, need on the other hand to guarantee that oil liquid pressure is enough large, to realize unloaded retraction.
In another embodiment, on valve body corresponding to described slewing directional control valve, be also provided with just time step valve and the contrary time step valve of revolution of revolution, two actuator ports of the valve body that described slewing directional control valve is corresponding are forward chamber and the reverse chamber of external rotary motors respectively, and described revolution just time step valve and the contrary time step valve of revolution is connected on respectively between two actuator ports of the valve body that described slewing directional control valve is corresponding and the return opening of valve body corresponding to described master winch selector valve.Revolution just time step valve is the auxiliary plug-in in the valve body that slewing directional control valve is corresponding with the contrary time step valve of revolution, is no more than the authorized pressure of motor for limiting the Maximum operating pressure of rotary motor.
In another embodiment, on valve body corresponding to described secondary elevator selector valve, be also provided with secondary elevator and rise time step valve and the secondary elevator time step valve that falls, two actuator ports of the valve body that described secondary elevator selector valve is corresponding are rising chamber and the decline chamber of external secondary hoist motors respectively, and described secondary elevator rises time step valve and the secondary elevator time step valve that falls and is connected on respectively between two actuator ports of the valve body that described secondary elevator selector valve is corresponding and the return opening of valve body corresponding to described master winch selector valve.Having secondary elevator to rise time step valve and the secondary elevator time step valve that falls is the auxiliary plug-in in the valve body that secondary elevator selector valve is corresponding, is no more than the authorized pressure of motor for limiting the Maximum operating pressure of secondary hoist motor.
In another embodiment, on 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, be also provided with one-way valve.One-way valve is realized fuel feeding for the filler opening that is communicated with external fuel feeding and corresponding selector valve, 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, relies on stick control, and regulating spool stroke, realizes throttle grverning, has the features such as adjustment stroke is long, simple in structure, versatility is good, cost is low.
The return opening of the valve body that in another embodiment, 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 corresponding valve body of master winch selector valve.
In another embodiment, described luffing selector valve, flexible selector valve, master winch selector valve, the assembling that superposes in order of slewing directional control valve and valve body corresponding to secondary elevator selector valve, also be separately installed with the first oil-feed connection of the valve body that adopts the first specification in both sides and adopt the second oil-feed of the valve body of the second specification to join, described the first oil-feed connection comprises the first main relief valve, the first pressure hydraulic fluid port and the first pressure tap, described the first pressure hydraulic fluid port communicates with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, the external pressure measuring element of described the first pressure tap, described the first main relief valve is arranged between described the first pressure hydraulic fluid port and described luffing selector valve and the oil return circuit of flexible selector valve, described the second oil-feed connection comprises the second main relief valve, the second pressure hydraulic fluid port and the second pressure tap, described the second pressure hydraulic fluid 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 the second pressure tap, described the second main relief valve is arranged between described the second pressure hydraulic fluid port and described secondary elevator selector valve and the oil return circuit of slewing directional control valve.Two oil-feed connection that comprise main relief valve, pressure hydraulic fluid port and pressure tap by setting, can provide oil-feed oil circuit and safety protection function, and can utilize external pressure measuring element to monitor oil circuit pressure.
For achieving the above object, the present invention also provides a kind of straight-arm lorry-mounted crane, comprises aforesaid lorry-mounted crane multi-way reversing device.Adopt the straight-arm lorry-mounted crane of aforesaid lorry-mounted crane multi-way reversing device can realize at lower cost the front interflow of valve control form, improved the operating efficiency of car load.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used 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 an embodiment's of lorry-mounted crane multi-way reversing device of the present invention hydraulic principle schematic diagram.
The structural representation of the valve body structure that Fig. 3,4 is respectively lorry-mounted crane multi-way reversing device embodiment of the present invention under different visual angles.
Embodiment
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
As shown in Figure 2, be an embodiment's of lorry-mounted crane multi-way reversing device of the present invention hydraulic principle schematic diagram.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 the 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 is connected on oil-feed oil circuit with master winch selector valve 42 after collaborating 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 tanks 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, thereby collaborate before having realized valve, after valve, collaborate to have reduced restriction loss, reduce energy consumption, and based on two metering pump fuel feeding, the principle at interflow before master winch valve, and then luffing and master winch are realized, luffing and revolution, stretch and revolution, the multiple composite move such as master winch and revolution, realize composite move without proportional multi-way valve, also without 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.
First quantitative oil pump here can be selected large discharge capacity metering pump, can meet the large discharge capacity needs of luffing, flexible and master winch action, and the second quantitative oil pump can be selected the small displacement metering pump that discharge capacity is less, can meet the large discharge capacity needs of revolution and the action of secondary elevator.
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 use separately the little weight object of lift up rapidly, also can be used in conjunction with to lift by crane special object with master winch, thereby expands the operation function of straight-arm lorry-mounted crane.In another embodiment, if straight-arm lorry-mounted crane does not configure secondary elevator, lorry-mounted crane multi-way reversing device also can not comprise secondary elevator selector valve and corresponding valve body, auxiliary plug-in etc.
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 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.Can find out from Fig. 3,4, master winch selector valve 42, flexible selector valve 32 are different from the specification of secondary elevator selector valve 62 and slewing directional control valve 52 corresponding valve bodies with the corresponding valve body of luffing selector valve 22.
Auxiliary plug-in can also be set in the corresponding valve body of each selector valve and play easy motion, reduce the effects such as energy consumption, safety protection, promote the control performance of selector valve.Describe in conjunction with Fig. 2-4 respectively below.
Master winch selector valve 42 and corresponding valve body 4 are mainly used in the rising of master winch and decline controlling, and valve body 4 is applicable to adopting the valve body of the first larger specification, meets the large traffic demand of large-tonnage straight-arm lorry-mounted crane, reduces restriction loss, the heating of minimizing system.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 is replaced to a large return opening, can effectively utilize the vertical area of valve body 4, reduce the thickness of valve body 4, reduced 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 of upper, middle and lower working position, correspond respectively to master winch motor rising, three kinds of actions stop and declining, and operator can rely on handle to carry out manual control, regulating spool stroke, realize throttle grverning, control the rotational velocity of master winch motor.
On the valve body 4 of master winch selector valve 42 correspondences, be also provided with master file secondary valve 43 and the master winch time step valve 44 that falls that rises, the actuator port A3 of valve body 4 and actuator port B3 be rising chamber and the decline chamber of external master winch motor respectively, and two actuator ports of master winch selector valve 42 communicate with actuator port A3 and the actuator port B3 of valve body 4 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 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 the auxiliary plug-in in valve body 4, and the Maximum operating pressure that can limit master winch motor is no more than the authorized pressure of master winch motor.
On oil-feed oil circuit before the filler opening of the interior master winch selector valve 42 of valve body 4, can also be provided with master winch one-way valve 41, the flexible meta return opening of selector valve 32 of these master winch one-way valve 41 unilaterally connecteds and the filler opening of master winch selector valve 42, realize the fuel feeding of large discharge capacity metering pump to valve body 4, and can prevent the mutual interference of oil circuit phase.And interflow one-way valve 45 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 that oil circuit from interfering with each other.
The valve body 2 of luffing selector valve 22 correspondences is mainly used in rising, falling to controlling of amplitude oil cylinder, and the valve body of the first specification that applicable employing is larger, to meet the large traffic demand of large-tonnage straight-arm lorry-mounted crane, reduces restriction loss, the heating of minimizing system.Luffing selector valve 22 can adopt three six logical hand-operated direction valves, there is three of upper, middle and lower working position, correspond respectively to hoisting, stop and the three kinds of actions that fall 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 large discharge capacity 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.
On oil-feed oil circuit before the filler opening of the interior luffing selector valve 22 of valve body 2, can also be provided with luffing one-way valve 21, the filler opening of this luffing one-way valve large discharge capacity metering pump of 21 unilaterally connected and luffing selector valve 22, realize the fuel feeding of large discharge capacity metering pump to valve body 2, and can prevent the mutual interference of oil circuit phase.
Compared with truck crane, straight-arm lorry-mounted crane operating speed is fast, easily produces vibration and impact in operation process and startup, while stopping, and can rock jib, reduce complete machine working performance, destroy hydraulic pipe line, and damage structural member.For fear of these problems, the large chamber of luffing time step valve 24, luffing loculus time step valve 25, the empty valve 23 of the anti-suction in the large chamber of luffing and the empty valve 26 of the anti-suction of luffing loculus can also be set on the valve body 2 of luffing selector valve 22 correspondences.The actuator port A1 of valve body 2 and actuator port B1 be large chamber (being rodless cavity) and the loculus (being rod chamber) of external amplitude oil cylinder respectively, and two actuator ports of luffing selector valve 22 communicate with actuator port A1 and the actuator port B1 of valve body 2 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 25 of step valves are connected between the actuator port B1 of valve body 2 and the return opening of valve body 4, the empty valve 23 of the anti-suction in the large chamber of luffing is in parallel with the large chamber of luffing time step valve 24, and the empty valve 26 of the anti-suction of luffing loculus 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 23 of the anti-suction in the large chamber of luffing 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, allow high-voltage oil liquid overflow 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 23 of the anti-suction in the large chamber of luffing and the empty valve 26 of the anti-suction of luffing loculus, prevent the generation of vacuum, avoid the generation of repeatedly hydraulic shock, thereby played 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 in the time that amplitude oil cylinder is vibrated; generate 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, and for controlling the little cavity pressure of amplitude oil cylinder, the pressure surge while increasing hydraulic system damping reduction retraction by overflow on the one hand, guarantees that oil liquid pressure is enough greatly to realize unloaded retraction on the other hand.As can be seen from Figure 3, because valve body 2 is large specification valve body, auxiliary plug-in mounting hole is larger, the empty valve 23 of the anti-suction in the large chamber of luffing, the large chamber of luffing time step valve 24 is as a whole, be arranged on the downside of valve body 2, luffing loculus time step valve 25 and the empty valve 26 of the anti-suction of luffing loculus are as a whole, are arranged on the upside of valve body 2.
The valve body 3 of flexible selector valve 32 correspondences is mainly used in the control of stretching out, retract of telescopic oil cylinder, and the valve body of the first specification that applicable employing is larger, to meet the large traffic demand of large-tonnage straight-arm lorry-mounted crane, reduces restriction loss, the heating of minimizing system.Flexible selector valve 32 can adopt three six logical hand-operated direction valves, there is three of upper, middle and lower working position, correspond respectively to stretching out, stop and the three kinds of actions of 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.
On oil-feed oil circuit before the filler opening of the interior flexible selector valve 32 of valve body 3, can also be provided with flexible one-way valve 31, the filler opening of this flexible one-way valve large discharge capacity metering pump of 31 unilaterally connected and flexible selector valve 32, realize the fuel feeding of large discharge capacity metering pump to valve body 3, and can prevent the mutual interference of oil circuit phase.
Flexible large chamber time step valve 33 and flexible loculus time step valve 34 can be set on valve body 3, the actuator port A2 of valve body 3 and actuator port B2 be large chamber (being rodless cavity) and the loculus (being rod chamber) of external telescopic oil cylinder respectively, and two actuator ports of flexible selector valve 32 communicate with actuator port A2 and the actuator port B2 of valve body 3 respectively.Flexible large chamber time step valve 33 is connected between actuator port A2 and the return opening of valve body 4, and flexible loculus time step valve 34 is connected between actuator port B2 and the return opening of 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 on the one hand straight-arm lorry-mounted crane 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.In the time that reality is used, can select the rated pressure of flexible large chamber time step valve 33 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, on the one hand increasing hydraulic system damping by overflow reduces the pressure surge while retracting and utilizes load deadweight to realize arm retraction, thereby improve robust motion, reduce energy consumption, need on the other hand to guarantee that oil liquid pressure is enough large, to realize unloaded retraction.
The valve body 5 of slewing directional control valve 52 correspondences is mainly used in rotating forward, multi channel, the valve body of less the second specification of applicable employing.Slewing directional control valve 52 can adopt three six logical hand-operated direction valves, there is three of upper, middle and lower working position, correspond respectively to rotary motor forward, stop 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.
On oil-feed oil circuit before the filler opening of the interior slewing directional control valve 52 of valve body 5, can also be provided with revolution one-way valve 51, the filler opening of these revolution one-way valve 51 unilaterally connected small displacement metering pumps and slewing directional control valve 52, realize the fuel feeding of small displacement metering pump to valve body 5, and can prevent the mutual interference of oil circuit phase.
Just time step valve 53 and the contrary time step valve 54 of revolution of revolution can be set on valve body 5, the actuator port A4 of valve body 5 and actuator port B4 be forward chamber and the reverse chamber of external rotary motor respectively, and two actuator ports of slewing directional control valve 52 communicate with actuator port A4 and the actuator port B4 of valve body 5 respectively.Revolution just time step valve 53 is connected between actuator port A4 and the return opening of valve body 4, and the contrary time step valve 54 of revolution is connected between actuator port B4 and the return opening of valve body 4.Revolution just time step valve 53 is the auxiliary plug-in in valve body 5 with the contrary time step valve 54 of revolution, for improving revolution control function.
The valve body 6 of secondary elevator selector valve 62 correspondences be mainly used in secondary elevator rising, decline and control, the valve body of less the second specification of applicable employing.Secondary elevator selector valve 62 can adopt three six logical hand-operated direction valves, there is three of upper, middle and lower working position, correspond respectively to secondary hoist motor rising, three kinds of actions stop and declining, 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.
On oil-feed oil circuit before the filler opening of the interior secondary elevator selector valve 62 of valve body 6, can also be provided with secondary elevator one-way valve 61, the filler opening of these pair elevator one-way valve 61 unilaterally connected small displacement metering pumps and secondary elevator selector valve 62, realize the fuel feeding of small displacement metering pump to valve body 6, and can prevent the mutual interference of oil circuit phase.
Secondary elevator can be set on valve body 6 and rise time step valve 63 and the secondary elevator time step valve 64 that falls, the actuator port A5 of valve body 6 and actuator port B5 be rising chamber and the decline chamber of external secondary hoist motor respectively, and two actuator ports of secondary elevator selector valve 62 communicate with actuator port A5 and the actuator port B5 of valve body 6 respectively.Secondary elevator rises time step valve 63 and is connected between actuator port A5 and the return opening of valve body 4, and the secondary elevator inferior step valve 64 that falls is connected between actuator port B5 and the return opening of valve body 4.Secondary elevator rises time step valve 63 and secondary elevator falls time step valve 64 for the auxiliary plug-in in valve body 6, is no more than the authorized pressure of motor for limiting the Maximum operating pressure of secondary hoist motor.
The valve body 2-6 of mentioned luffing selector valve 22, flexible selector valve 32, master winch selector valve 42, slewing directional control valve 52 and the secondary elevator selector valve 62 correspondences assembling that can superpose in order above; and can be separately installed with in both sides the first oil-feed connection 1 of the valve body that adopts the first specification and adopt the second oil-feed of the valve body of the second specification to join 2, so that oil-feed oil circuit and safety protection function to be provided.
The first oil-feed connection 1 comprises the first main relief valve 11, the first pressure hydraulic fluid port P1 and the first pressure tap MP1, the first pressure hydraulic fluid port P1 communicates with the oil-feed oil circuit of luffing selector valve 22 and flexible selector valve 32, and can external large discharge capacity metering pump, the first pressure tap MP1 can external pressure measuring element, and oil circuit pressure is monitored.The first main relief valve 11 is arranged between the first pressure hydraulic fluid port P1 and luffing selector valve 22 and the oil return circuit of flexible selector valve 32.The first oil-feed connection 1 adopts large specification valve body, its first pressure hydraulic fluid port P1 adopts large discharge capacity metering pump fuel feeding, has met the traffic demand of luffing, flexible and master winch.The second main relief valve 11 can be realized overload protection, the maximum pressure of restriction luffing, flexible and master winch.
The second oil-feed connection 7 comprises the second main relief valve 71, the second pressure hydraulic fluid port P2 and the second pressure tap MP2, and the second pressure hydraulic fluid port P2 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.The second pressure tap MP2 can external pressure measuring element, and oil circuit pressure is monitored.The second main relief valve 71 is arranged between the second pressure hydraulic fluid port P2 and secondary elevator selector valve 62 and the oil return circuit of slewing directional control valve 52.The second oil-feed connection 7 adopts small dimension valve bodies, its second pressure hydraulic fluid port P2 adopts small displacement metering pump fuel feeding, has met the traffic demand of revolution, secondary elevator, has reached again the requirement that reduces costs, reduces multi-way valve weight.The second main relief valve 71 can be realized 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 and master winch, flexible with turn round, stretch and multiple composite moves such as secondary elevator, master winch and revolution and master winch and secondary elevator.And in the time of master winch single movement, can realize the interflow fuel feeding of large discharge capacity metering pump and small displacement metering pump, to realize rapid movement.Its working principle is specific as follows:
1, Dual-pump flow-converging: when luffing, flexible, revolution and secondary elevator static, be that its corresponding selector valve is all in the time of meta, large discharge capacity metering pump through the meta oil circuit of the meta oil circuit of the first pressure hydraulic fluid port P1, luffing selector valve 22, flexible selector valve 32 and master winch one-way valve 41 to master winch selector valve 42 fuel feeding, small displacement metering pump through the meta oil circuit of the meta oil circuit of the second pressure hydraulic fluid port P2, secondary elevator selector valve 62, slewing directional control valve 52 and interflow one-way valve 45 to master winch selector valve 42 fuel feeding.The pressure oil liquid of two metering pumps is realized interflow through master winch one-way valve 41, interflow one-way valve 45 respectively before the filler opening of master winch selector valve 42.In the time that master winch is failure to actuate, interflow fluid through the meta oil circuit of master winch selector valve 42 through double back hydraulic fluid port T1, T2 mouth oil sump tank; In the time that master winch moves, interflow fluid is supplied with master winch motor through master winch selector valve 42, realizes high-speed motion, and its maximum allowble pressure is limited by the rated pressure of the first main relief valve 11, the second main relief valve 71 respectively.
2, composite move: when luffing or flexible while having action, large discharge capacity metering pump is supplied with corresponding selector valve through the first pressure hydraulic fluid port P1, the first pressure hydraulic fluid port P1 is to the oil circuit disconnection of master winch one-way valve 41, now, small displacement metering pump is supplied with valve body 6, valve body 5 and valve body 4 through the second pressure hydraulic fluid port P2, thereby can realize luffing and master winch, luffing and revolution, luffing and secondary elevator, flexible and 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; In the time of revolution or the action of secondary elevator, small displacement pump is supplied with corresponding selector valve through the second pressure hydraulic fluid port P2, the first pressure hydraulic fluid port P1 is to the oil circuit disconnection of collaborating one-way valve 45, now, large discharge capacity metering pump is supplied with valve body 2, valve body 3 and valve body 4 through the first pressure hydraulic fluid port P1, thereby can realize secondary elevator and master winch, secondary elevator with flexible, secondary elevator with master winch, revolution and master winch, turn round and stretch and revolution 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 has adopted aforesaid lorry-mounted crane multi-way reversing device embodiment collaborates control form before can realizing at lower cost valve, 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 the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement the specific embodiment of the present invention; 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 protection of the present invention.

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 the 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 is connected with described master winch selector valve with behind the oil-feed oil circuit of described luffing selector valve and flexible selector valve interflow on oil-feed oil circuit, 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.
2. lorry-mounted crane multi-way reversing device according to claim 1, is characterized in that, the discharge capacity of described the first quantitative oil pump is greater than the discharge capacity of described the second quantitative oil pump.
3. lorry-mounted crane multi-way reversing device according to claim 2, is characterized in that, also comprises: secondary elevator selector valve, 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 the first specification is corresponding with the discharge capacity of described the first quantitative oil pump, and the valve body of described the second specification is corresponding with the discharge capacity of described the second quantitative oil pump.
5. lorry-mounted crane multi-way reversing device according to claim 4, it is characterized in that, on valve body corresponding to described luffing selector valve, be 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, two actuator ports of the valve body that described luffing selector valve is corresponding large chamber and loculus of external amplitude oil cylinder respectively, the large chamber of described luffing time step valve and luffing loculus time step valve is connected on respectively between two actuator ports of the valve body that described luffing selector valve is corresponding and the return opening of valve body corresponding to 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, on valve body corresponding to described flexible selector valve, be also provided with flexible large chamber time step valve and flexible loculus time step valve, two actuator ports of the valve body that described flexible selector valve is corresponding are large chamber and the loculus of external telescopic oil cylinders respectively, and described flexible large chamber time step valve and flexible loculus time step valve are connected on respectively between two actuator ports of the valve body that described flexible selector valve is corresponding and the return opening of valve body corresponding to 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, on 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, be also provided with one-way valve.
8. according to the lorry-mounted crane multi-way reversing device described in claim 5 or 6, it 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, the assembling that superposes in order of slewing directional control valve and valve body corresponding to secondary elevator selector valve, also be separately installed with the first oil-feed connection of the valve body that adopts the first specification in both sides and adopt the second oil-feed of the valve body of the second specification to join, described the first oil-feed connection comprises the first main relief valve, the first pressure hydraulic fluid port and the first pressure tap, described the first pressure hydraulic fluid port communicates with the oil-feed oil circuit of described luffing selector valve and flexible selector valve, the external pressure measuring element of described the first pressure tap, described the first main relief valve is arranged between described the first pressure hydraulic fluid port and described luffing selector valve and the oil return circuit of flexible selector valve, described the second oil-feed connection comprises the second main relief valve, the second pressure hydraulic fluid port and the second pressure tap, described the second pressure hydraulic fluid 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 the second pressure tap, described the second main relief valve is arranged between described the second pressure hydraulic fluid port and 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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