CN203081882U

CN203081882U - Single-pump and multi-motor closed type hydraulic system and engine machinery including same

Info

Publication number: CN203081882U
Application number: CN 201320053266
Authority: CN
Inventors: 贺劲; 赵岳; 许辉; 龚敬; 陈斌
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2013-01-30
Filing date: 2013-01-30
Publication date: 2013-07-24
Anticipated expiration: 2023-01-30

Abstract

The utility model provides a single-pump and multi-motor closed type hydraulic system and engine machinery including the same. The single-pump and multi-motor closed type hydraulic system comprises a plurality of motors and a closed pump (10), wherein the plurality of motors are connected in series, the closed pump (10) is connected with the plurality of motors in series, and flow cutoff control mechanisms (20) are arranged on the plurality of motors, the closed pump (10) and hydraulic pipelines connecting the closed pump (10) with the plurality of motors. The flow cutoff control mechanisms (20) enable connecting lines between the closed pump (10) and the motors to be communicated and to form a first hydraulic circuit when the hydraulic system is operated normally, the flow cutoff control mechanisms (20) enable a second hydraulic circuit to be formed between the closed pump (10) and the flow cutoff control mechanisms (20) when the hydraulic system is operated at an idle speed or is at rest, and the connecting lines between the second hydraulic circuit are not communicated. By means of the single-pump and multi-motor closed type hydraulic system, idling of the plurality of motors is prevented effectively, and zero drift phenomenon of the closed pump can be diagnosed timely.

Description

Single motor closed hydraulic system of pump Thomas and comprise the engineering machinery of this hydraulic system

Technical field

The utility model relates to the hydraulic system in the engineering machinery, in particular to a kind of motor closed hydraulic system of single pump Thomas and comprise the engineering machinery of this hydraulic system.

Background technique

Adopting the motor closed hydraulic system of single pump Thomas comparatively general at present in pavement construction machinery and construction machinery product hydraulic system, generally is to drive a plurality of oil hydraulic motors by an enclosed pump to do two-way rotation or unidirectional rotation.

Figure 1 shows that a kind of paver hydraulic circuit that vibrates, adopt an enclosed pump 10 ' to drive four same displacement motors (first motor, 11 ', the second motor 12 ', the 3rd motor 13 ', the 4th motor 15 ').These four motors are by being configured to series loop in twos in groups, and two series loops connect into the shunt circuit again.The output oil of enclosed pump high pressure output oil port flows to into the shunt circuit, and even shunting enters the filler opening of first motor 1 ' in these two series loops, enter the filler opening of second motor 2 ' through its oil outlet, flow out the low pressure input hydraulic fluid port that the interflow, back enters enclosed pump 10 ' through second motor, 2 ' oil outlet again.The Thomas who adopts and be connected in series reaches the loop and can obtain needed ability of vibrating and essentially identical working speed.

Another kind of paver vibrates hydraulic circuit as shown in Figure 2, be to adopt an enclosed pump 10 ' to drive three same displacement motors (first motor, 11 ', the second motor 12 ', the 3rd motor 13 '), these three motors are connected mutually, and form the loop with the enclosed series connection of pumps.

Wherein, the enclosed pump all has slippage pump, its slippage pump pattern with the enclosed pump be integrated built-in in the majority, also can be externally, two kinds of enclosed pump difference external and built-in slippage pump only are that slippage pump is external.The slippage pump function is: with the compensation internal leakage, keep the pressure of major loop, the fluid cooling is provided, compensation external valve and auxiliary system are leaked, and provide pressure oil for control.

Drive the motor closed hydraulic system of Thomas for single pump, the slippage pump of enclosed pump is only to the low voltage side repairing of oil hydraulic circuit during proper functioning; When the enclosed pump enters idling when treating worker's state, generally all the output flow of enclosed pump is controlled to be zero, as makes mechanical zero, hydraulic pressure zero-bit and the electrical null position of enclosed pump stroking mechanism all in the tram, the enclosed pump is pressure oil output no longer outwards.Meanwhile, no matter disposing built-in slippage pump still is the enclosed pump of external slippage pump, its slippage pump that disposes all can keep work so that essential repairing oil stream to be provided, and rely on the repairing relief valve to produce suitable repairing oil pressure relief.This repairing oil pressure relief is that each enclosed just preestablishes by the pump designing requirement when pumping factory, and actual oil compensation pressure size is relevant with enclosed pump usefulness slippage pump transmission shaft rotating speed, but is no more than the repairing oil pressure relief of having set.Under enclosed pump input shaft speed controlled condition, the slippage pump working speed is constant, and oil compensation pressure is constant naturally, need not row again and regulates.

Fig. 3 and Fig. 4 control the working oil stream of doing the both direction rotation respectively by enclosed pump stroking mechanism when working for general single pump driving Thomas reaches two-way rotation closed type hydraulic system and illustrate, a wherein actuator port A(or a B of enclosed pump 10 ') be the high pressure delivery outlet, another actuator port B(or A) be the low pressure inlet opening.The main configuration part that has comprised standard type enclosed pump in the double dot dash line frame: both sides high-pressure overflow valve 24 ' is all in parallel repairing one-way valve (one-way valve 231 ' and one-way valve 221 '), the high pressure oil of enclosed pump 10 ' output is from high pressure delivery outlet A(or B) flow to the Thomas that connects by solid big arrow and reach (first motor 11 ', second motor 12 ', the 3rd motor 13 ') is subjected to the setting pressure restriction of this side high-pressure overflow valve 24 ' time, guarantee that working pressure does not transfinite, close the repairing one-way valve 231 ' of this high-pressure overflow valve 24 ' parallel connection simultaneously with the active force that exceeds oil compensation pressure that slippage pump 14 ' is produced, make that slippage pump 14 ' can only be toward the low voltage terminal repairing of this closed type hydraulic system.The fluid that outflow series connection Thomas reaches flows to low pressure inlet opening B(or the A that flows into enclosed pump 10 ' with low-pressure state by hollow big arrow), finish closed cycle.Slippage pump repairing oil stream can directly be opened the repairing one-way valve 221 ' of enclosed pump low voltage side relief valve 24 ' parallel connection, enters enclosed pump 10 ' low voltage side and carries out repairing, also flows into enclosed pump 10 ' low pressure inlet opening.Solid small arrow has represented that slippage pump repairing oil stream flows among the figure.

The A point pressure is an enclosed pump high pressure delivery pressure among Fig. 3, that is first motor, 11 ' inlet pressure, and the B point pressure is an enclosed pump low pressure incoming pressure, that is the 3rd motor 13 ' outlet pressure, and C and D two point pressures are series connection motor operations pressure.The B point pressure is an enclosed pump high pressure delivery pressure among Fig. 4, that is the 3rd motor 13 ' inlet pressure, and the A point pressure is an enclosed pump low pressure incoming pressure, that is first motor, 11 ' outlet pressure, and C and D two point pressures are series connection motor operations pressure.Because all the time have pressure reduction between enclosed pump work hydraulic fluid port A and the B at 2 in two kinds in motor rotation loop, the motor that the series connection Thomas reaches the loop just can rotate.G point among Fig. 3 and Fig. 4 is enclosed pump feed circuit pressure port, can directly obtain enclosed pump oil compensation pressure oil stream from this.

Fig. 5 for the machine idling treat the motor closed hydraulic system of single pump Thomas in man-hour the signal of oil stream (no matter the enclosed pump drive the series connection Thomas reach do which kind of rotation direction and rotate all identical).Generally all the output flow of enclosed pump 10 ' is controlled to be zero this moment (as making mechanical zero, hydraulic pressure zero-bit and the electrical null position of enclosed pump stroking mechanism all in the tram, guarantee the zero output of enclosed pump), enclosed pump 10 ' is pressure oil output no longer outwards, in whole closed type hydraulic system, there is not high pressure, but, still provide the repairing fluid of constant oil compensation pressure to closed type hydraulic system because of slippage pump 14 ' produces with the speed running.For the enclosed pump 10 ' that adopts the external slippage pump, the external slippage pump provides the low voltage side repairing can for equally enclosed pump 10 '.No matter built-in or external slippage pump all can provide necessary repairing oil stream to enclosed pump 10 ', keeps necessary oil compensation pressure.

Machine is in idling and treats man-hour, slippage pump 14 ' sucks fluid from fuel tank, the repairing that produces oil stream in closed type hydraulic system, press arrow and flow to and flow, back down the repairing one-way valve 221 ' and 231 ' of 10 ' two high-pressure overflow valve parallel connections of enclosed pump respectively, be carried in the import of the enclosed pump high pressure delivery outlet and first motor 11 ' simultaneously to the E point, be carried in the outlet of enclosed pump 10 ' low pressure inlet opening and the 3rd motor 13 ' to the F point simultaneously.E, A, F and B four point pressures are impartial naturally at this moment, are all the oil compensation pressure of slippage pump, that is enclosed pump feed circuit pressure G mouth pressure among Fig. 5.This oil compensation pressure has height by the different different repairing amounts of output of slippage pump rotating speed, but can not surpass the oil pressure relief that repairing relief valve 25 ' sets.Slippage pump 14 ' invariablenes turning speed, oil compensation pressure also can be constant.

Because of oil hydraulic motor is let out in existing inevitably, so leak to motor casing with the hydraulic oil that second motor 12 ' is connected in series intermediate duct C mutually by the motor hydraulic fluid port at first motor 11 ', the feasible intervalve trackside hydraulic fluid port pressure that connects first motor 11 ' and second motor 12 ' is lower than first motor, 11 ' filler opening pressure (being enclosed pump oil compensation pressure) and is relatively low pressure, has certain pressure reduction between the oil inlet and outlet of first motor 11 '.Herewith, the 3rd motor 13 ' leaks to motor casing with the hydraulic oil that second motor 12 ' is connected in series intermediate duct D mutually by the motor hydraulic fluid port, make the intervalve trackside hydraulic fluid port pressure that connects the 3rd motor 13 ' and second motor 12 ' be lower than the 3rd motor 13 ' oil outlet pressure (being enclosed pump oil compensation pressure), have certain pressure reduction between the oil inlet and outlet of same the 3rd motor 13 ' also for relatively low pressure.If the load of motor drive mechanism is very little, motor can overcome resistance and produce idle running under the effect of this pressure reduction.Even this moment, stroking mechanism zero drift and the input of Variable Control signal did not take place in the enclosed pump, but still rotation of motor mechanism can not reliably stop, causing improper action, influence the machine works effect.

In sum, the motor closed hydraulic system of single pump Thomas is easy to treat that in idling the origin cause of formation that idle running takes place man-hour is that the slippage pump output fluid of enclosed pump this moment enters the series connection Thomas with oil compensation pressure and reaches the import of first motor 11 ' in the loop and the outlet (see figure 5) of the 3rd motor 13 ', and the relatively low pressure of this oil compensation pressure all appears being lower than in the import that Yin Mada inevitably leaks the outlet that makes the motor 11 ' of winning and the 3rd motor 13 ', thus pressure reduction will make motor required overcome under the less situation of resistance rotate.

Therefore, for the machine that adopts the motor closed hydraulic system of single pump Thomas, though the problem that exists is that machine enclosed pump when idling is treated worker's situation often exists under the less situation of motor load comparatively slowly and the difficult motor rotation phenomenon of eliminating (hereinafter to be referred as motor idle running) by not making the Thomas reach the requirement of loop works this moment and not having the output services flow to reach the loop to the Thomas at present.For guaranteeing the works fine performance of machine, this idle running should effectively be eliminated.

It is as follows that the single pump Thomas who has proposed in the prior art reaches hydraulic system idle running removing method:

1. hydraulic system adds and joins mechanical locking device for this reason, can not in time remove locking when this method existence changes proper functioning over to because of machine and may damage the possibility that single pump Thomas reaches hydraulic system.

2. hydraulic system adds and joins the synchronized splitter valve for this reason, and this rule is not good enough because of cost of production increases more Economy.

3. hydraulic system adds and joins [constant and one-way valve (or solenoid directional control valve) for this reason, form feed circuit, as shown in Figure 2, provide pressure oil by special [constant P, back down one-way valve (mark 221 ' and 231 ' among the figure, or unlatching solenoid directional control valve) and implement repairing to the intermediate duct of series connection motor (mark 11 ', 12 ' and 13 ' among the figure).It is 200910180031.9 Chinese invention patent " single pump Thomas reaches hydraulic system and prevents the method for motor free time from rotation " that this kind set-up mode comes from application number, the [constant P that this method needs inserts outside the motor closed hydraulic system of single pump Thomas in addition, and when using this [constant P to carry out repairing, must carry out Pressure testing and carry out the pressure adjusting it, consistent to guarantee [constant P pressure with enclosed pump 10 ' pressure.

Yet the third method needs to insert [constant separately outside the motor closed hydraulic system of single pump Thomas, and must carry out the [constant Pressure testing to it and regulate to guarantee [constant pressure consistent with the enclosed pumping pressure with pressure when using [constant to carry out repairing.In actual use, treat that because of each machine is in idling power source in man-hour (as motor) rotating speed might not be in full accord, the slippage pump output flow is not quite similar, make oil compensation pressure change to some extent, will make this Pressure testing and adjusting frequently carry out, increase workload, inconvenience is arranged more.This hydraulic system causes the enclosed pumping pressure to exceed the [constant pressure that connects for enclosed pump appearance output zero drift phenomenon does not simultaneously have diagnosis capability.

The model utility content

The utility model aims to provide a kind of motor closed hydraulic system of single pump Thomas and comprises the engineering machinery of this hydraulic system, can prevent effectively that the Thomas from reaching idle running, in time diagnoses the zero drift phenomenon of enclosed pump.

To achieve these goals, according to an aspect of the present utility model, a kind of single pump Thomas is provided motor closed hydraulic system, a plurality of motors and an enclosed pump that is connected in series with a plurality of motors of comprising serial connection, at a plurality of motors, the enclosed pump and be connected motor and the enclosed pump between hydraulic pipe line be provided with the cutout control mechanism, the cutout control mechanism is when the hydraulic system proper functioning, the enclosed pump is communicated with connecting pipeline between the motor forms first oil hydraulic circuit, treat man-hour in the hydraulic system idling, make to form second oil hydraulic circuit between enclosed pump and the cutout control mechanism that second oil hydraulic circuit is not communicated with connecting pipeline between the motor.

Further, hydraulic system comprises the motor serial connection pipeline at a plurality of motors place of serial connection, at first end of motor serial connection pipeline and first delivery line between the first enclosed pump work hydraulic fluid port with at second end of motor serial connection pipeline and second delivery line between the second enclosed pump work hydraulic fluid port, the cutout control mechanism is connected between first delivery line and second delivery line, hydraulic system is when proper functioning, cutout control mechanism control enclosed pump is connected in series pipeline and forms first oil hydraulic circuit with motor, the hydraulic system idling is treated man-hour, and cutout control mechanism and enclosed pump form second oil hydraulic circuit.

Further, the cutout control mechanism comprises a selector valve that is connected simultaneously on first delivery line and second delivery line; Selector valve is divided into first connecting pipeline and second connecting pipeline with first delivery line, and second delivery line is divided into the 3rd connecting pipeline and the 4th connecting pipeline; Selector valve has is connected first connecting pipeline and second connecting pipeline and first station that the 3rd connecting pipeline and the 4th connecting pipeline are connected, and second station that makes first connecting pipeline and the 3rd connecting pipeline be connected and second connecting pipeline and the 4th connecting pipeline are not connected.

Further, selector valve is two six energising magnetic selector valves, and two six energising magnetic selector valves comprise first actuator port, second actuator port, the 3rd actuator port, the 4th actuator port, the 5th actuator port and the 6th actuator port; The two ends of first connecting pipeline are connected between the first enclosed pump work hydraulic fluid port and first actuator port; The two ends of the 3rd connecting pipeline are connected between the second enclosed pump work hydraulic fluid port and second actuator port; Between first end that second connecting pipeline is connected motor serial connection pipeline and the 5th actuator port of two the six magnetic selector valves of switching on; Between second end that the 4th connecting pipeline is connected motor serial connection pipeline and the 6th actuator port of two the six magnetic selector valves of switching on; The 3rd actuator port and the 4th actuator port of two six energising magnetic selector valves are connected; When the spool of two six energising magnetic selector valves was positioned at first station, first actuator port and the 5th actuator port of two six energising magnetic selector valves were connected, and second actuator port and the 6th actuator port are connected; When the spool of two six energising magnetic selector valves was positioned at second station, first actuator port and the 3rd actuator port of two six energising magnetic selector valves were connected, and second actuator port and the 4th actuator port are connected.

Further, selector valve is the 3-position 4-way solenoid directional control valve, and the 3-position 4-way solenoid directional control valve comprises first actuator port, second actuator port, the 3rd actuator port and the 4th actuator port; The two ends of first connecting pipeline are connected between the first enclosed pump work hydraulic fluid port and first actuator port; The two ends of the 3rd connecting pipeline are connected between the second enclosed pump work hydraulic fluid port and second actuator port; Second connecting pipeline is connected between the 3rd actuator port of first end of motor serial connection pipeline and 3-position 4-way solenoid directional control valve; The 4th connecting pipeline is connected between the 4th actuator port of second end of motor serial connection pipeline and 3-position 4-way solenoid directional control valve; When the spool of 3-position 4-way solenoid directional control valve was positioned at first station, first actuator port and the 4th actuator port of 3-position 4-way solenoid directional control valve were connected, and second actuator port and the 3rd actuator port are connected; When the spool of 3-position 4-way solenoid directional control valve was positioned at second station, first actuator port and second actuator port of 3-position 4-way solenoid directional control valve were connected, and the 3rd actuator port and the 4th actuator port are not connected; When the spool of 3-position 4-way solenoid directional control valve was positioned at the 3rd station, first actuator port and the 3rd actuator port of 3-position 4-way solenoid directional control valve were connected, and second actuator port and the 4th actuator port are connected.

Further, selector valve is three eight energising magnetic selector valves, and three eight energising magnetic selector valves comprise first actuator port, second actuator port, the 3rd actuator port, the 4th actuator port, the 5th actuator port, the 6th actuator port, the 7th actuator port and the 8th actuator port; The two ends of first connecting pipeline are connected between the first enclosed pump work hydraulic fluid port and first actuator port; The two ends of the 3rd connecting pipeline are connected between the second enclosed pump work hydraulic fluid port and second actuator port; Between first end that second connecting pipeline is connected motor serial connection pipeline and the 3rd actuator port of three the eight magnetic selector valves of switching on; Between second end that the 4th connecting pipeline is connected motor serial connection pipeline and the 4th actuator port of three the eight magnetic selector valves of switching on; When the spool of three eight energising magnetic selector valves is positioned at first station, first actuator port and the 3rd actuator port of three eight energising magnetic selector valves are connected, second actuator port and the 4th actuator port are connected, and the 3rd actuator port and the 4th actuator port directly are communicated with; When the spool of three eight energising magnetic selector valves was positioned at second station, first actuator port and the 5th actuator port of three eight energising magnetic selector valves were connected, and second actuator port and the 6th actuator port are connected, and the 5th actuator port and the 6th actuator port are connected.

Further, selector valve is two four-way electromagnetic reversing valves, and two four-way electromagnetic reversing valves comprise first actuator port, second actuator port, the 3rd actuator port and the 4th actuator port; The two ends of first connecting pipeline are connected between the first enclosed pump work hydraulic fluid port and first actuator port; The two ends of the 3rd connecting pipeline are connected between the second enclosed pump work hydraulic fluid port and second actuator port; Second connecting pipeline is connected between the 3rd actuator port of first end of motor serial connection pipeline and two four-way electromagnetic reversing valves; The 4th connecting pipeline is connected between the 4th actuator port of second end of motor serial connection pipeline and two four-way electromagnetic reversing valves; When the spool of two four-way electromagnetic reversing valves was positioned at first station, first actuator port and the 3rd actuator port of two four-way electromagnetic reversing valves were connected, and second actuator port and the 4th actuator port are connected; When the spool of two four-way electromagnetic reversing valves was positioned at second station, first actuator port and second actuator port of two four-way electromagnetic reversing valves were connected, and the 3rd actuator port and the 4th actuator port are not connected.

Further, the cutout control mechanism comprises three eight energising magnetic selector valves, first bidirectional hydraulic lock and second bidirectional hydraulic locks; Three eight energising magnetic selector valves comprise first actuator port, second actuator port, the 3rd actuator port, the 4th actuator port, the 5th actuator port, the 6th actuator port, the 7th actuator port and the 8th actuator port; First actuator port is communicated to the first enclosed pump work hydraulic fluid port, and second actuator port is communicated to the second enclosed pump work hydraulic fluid port; First outlet of first bidirectional hydraulic lock is communicated to first end of motor serial connection pipeline, second outlet of first bidirectional hydraulic lock is communicated to second end of motor serial connection pipeline, first import of first bidirectional hydraulic lock is communicated to the 3rd actuator port, and second import of first bidirectional hydraulic lock is communicated to the 4th actuator port; First outlet of second bidirectional hydraulic lock is communicated to second end of motor serial connection pipeline, second outlet of second bidirectional hydraulic lock is communicated to first end of motor serial connection pipeline, first import of second bidirectional hydraulic lock is communicated to the 7th actuator port, and second import of second bidirectional hydraulic lock is communicated to the 8th actuator port; The 5th actuator port is connected with the 6th actuator port; When the spool of three eight energising magnetic selector valves was positioned at first station, first actuator port and the 3rd actuator port of three eight energising magnetic selector valves were connected, and second actuator port and the 4th actuator port are connected; When the spool of three eight energising magnetic selector valves was positioned at second station, first actuator port and the 5th actuator port of three eight energising magnetic selector valves were connected, and second actuator port and the 6th actuator port are connected; When the spool of three eight energising magnetic selector valves was positioned at the 3rd station, first actuator port and the 7th actuator port of three eight energising magnetic selector valves were connected, and second actuator port and the 8th actuator port are connected.

Further, the cutout control mechanism comprises the first two-bit triplet solenoid directional control valve and the second two-bit triplet solenoid directional control valve, the first two-bit triplet solenoid directional control valve is connected on first end and the hydraulic pipe line between the first enclosed pump work hydraulic fluid port of motor serial connection pipeline, and the second two-bit triplet solenoid directional control valve is connected on second end and the hydraulic pipe line between the second enclosed pump work hydraulic fluid port of motor serial connection pipeline; The first two-bit triplet solenoid directional control valve and the second two-bit triplet solenoid directional control valve include first actuator port, the 3rd actuator port and the 4th actuator port; First actuator port of the first two-bit triplet solenoid directional control valve is communicated to the first enclosed pump work hydraulic fluid port, first actuator port of the second two-bit triplet solenoid directional control valve is communicated to the second enclosed pump work hydraulic fluid port, the 3rd actuator port of the first two-bit triplet solenoid directional control valve is connected to the 3rd actuator port of the second two-bit triplet solenoid directional control valve, the 4th actuator port of the first two-bit triplet solenoid directional control valve is communicated to first end of motor serial connection pipeline, and the 4th actuator port of the second two-bit triplet solenoid directional control valve is communicated to second end of motor serial connection pipeline.

Further, the cutout control mechanism comprises that first often drives solenoid directional control valve, second and often drive solenoid directional control valve and two-way normally closed solenoid directional control valve; First often drives solenoid directional control valve is arranged on first delivery line, and first delivery line is divided into first connecting pipeline and second connecting pipeline; Second often drives solenoid directional control valve is arranged on second delivery line, and second delivery line is divided into the 3rd connecting pipeline and the 4th connecting pipeline; Two-way normally closed solenoid directional control valve is connected on the connecting pipeline between first connecting pipeline and the 4th connecting pipeline.

Further, the cutout control mechanism comprises that first often drives solenoid directional control valve, second and often drive solenoid directional control valve and the 3rd two-bit triplet solenoid directional control valve, and the 3rd two-bit triplet selector valve comprises first actuator port, second actuator port and the 3rd actuator port; First often drives solenoid directional control valve is arranged on first delivery line, and first delivery line is divided into first connecting pipeline and second connecting pipeline; Second often drives solenoid directional control valve is arranged on second delivery line, and second delivery line is divided into the 3rd connecting pipeline and the 4th connecting pipeline; The 3rd two-bit triplet solenoid directional control valve is connected on the connecting pipeline between first connecting pipeline and the 4th connecting pipeline, and connecting pipeline is separated into first section of linking to each other with first connecting pipeline with second section that links to each other with the 3rd connecting pipeline, second actuator port is communicated to first connecting pipeline by first section connecting pipeline, and the 3rd actuator port is communicated to the 3rd connecting pipeline by second section connecting pipeline; When the 3rd two-bit triplet solenoid directional control valve was positioned at first station, first actuator port, second actuator port and the 3rd actuator port were not communicated with mutually; When the 3rd two-bit triplet solenoid directional control valve was positioned at second station, second actuator port was communicated with the 3rd actuator port.

Further, the cutout control mechanism comprises a pilot operated directional control valve that is connected simultaneously on first delivery line and second delivery line, pilot operated directional control valve is divided into first connecting pipeline and second connecting pipeline with first delivery line, second delivery line is divided into the 3rd connecting pipeline and the 4th connecting pipeline, and the control port of pilot operated directional control valve is connected with the control oil channel of the valve element position of control pilot operated directional control valve; Pilot operated directional control valve comprises first actuator port, second actuator port, the 3rd actuator port and the 4th actuator port; The two ends of first connecting pipeline are connected between the first enclosed pump work hydraulic fluid port and first actuator port; The two ends of the 3rd connecting pipeline are connected between the second enclosed pump work hydraulic fluid port and second actuator port; Second connecting pipeline is connected between the 3rd actuator port of first end of motor serial connection pipeline and pilot operated directional control valve; The 4th connecting pipeline is connected between the 4th actuator port of second end of motor serial connection pipeline and pilot operated directional control valve; When the spool of pilot operated directional control valve was positioned at first station, first actuator port and the 4th actuator port of pilot operated directional control valve were connected, and second actuator port and the 3rd actuator port are connected; When the spool of pilot operated directional control valve was positioned at second station, first actuator port and second actuator port of pilot operated directional control valve were connected, and the 3rd actuator port and the 4th actuator port are not connected; When the spool of pilot operated directional control valve was positioned at the 3rd station, first actuator port and the 3rd actuator port of pilot operated directional control valve were connected, and second actuator port and the 4th actuator port are connected.

Further, control oil channel comprises: the guide controls oil sources; Oil sump tank; Pilot-actuated valve, pilot-actuated valve is connected the guide and controls between oil sources and the oil sump tank, first actuator port of pilot-actuated valve is connected to the guide and controls oil sources, second actuator port of pilot-actuated valve is connected to oil sump tank, and two actuator ports of pilot-actuated valve are connected to two control ports of pilot operated directional control valve respectively.

Further, the cutout control mechanism comprises that the first normally closed solenoid directional control valve, the second normally closed solenoid directional control valve, first often open pilot operated directional control valve and second and often open pilot operated directional control valve; First often opens pilot operated directional control valve is arranged on first delivery line, and first delivery line is divided into first connecting pipeline and second connecting pipeline; Second often opens pilot operated directional control valve is arranged on second delivery line, and second delivery line is divided into the 3rd connecting pipeline and the 4th connecting pipeline; First control port of often opening pilot operated directional control valve is communicated on first connecting pipeline by first control oil channel, the first normally closed solenoid directional control valve is arranged on first control oil channel, prevents that hydraulic oil flows to first control port of often opening pilot operated directional control valve from first control oil channel under the normally off; Second control port of often opening pilot operated directional control valve is communicated on the 3rd connecting pipeline by second control oil channel, the second normally closed solenoid directional control valve is arranged on second control oil channel, prevent that hydraulic oil flows to second control port of often opening pilot operated directional control valve from second control oil channel under the normally off, first control oil channel and second control oil channel are intersected in first node.

According on the other hand of the present utility model, a kind of engineering machinery is provided, comprise the motor closed hydraulic system of single pump Thomas, the motor closed hydraulic system of this list pump Thomas is the above-mentioned motor closed hydraulic system of single pump Thomas.

Use the technical solution of the utility model, the motor closed hydraulic system of single pump Thomas comprises a plurality of motors and enclosed pump that is connected in series with a plurality of motors of serial connection, a plurality of motors, enclosed pump and be connected motor and the enclosed pump between formed first oil hydraulic circuit of hydraulic pipe line be provided with the cutout control mechanism, the cutout control mechanism is when the hydraulic system proper functioning, make enclosed pump and motor form first oil hydraulic circuit, treat man-hour in the hydraulic system idling, make the enclosed pump by second oil hydraulic circuit of cutout control mechanism formation without motor.When the utility model is in proper functioning in hydraulic system, make hydraulic oil flow, thereby the drive motor normal rotation make the hydraulic system proper functioning through first oil hydraulic circuit.Be in idling in hydraulic system and treat man-hour, make hydraulic-pressure pump second oil hydraulic circuit of flowing through, and without motor, motor is not connected with hydraulic pipe line between the enclosed pump, no longer include oil and flow to out each motor hydraulic fluid port, each motor no longer has the power of rotation, therefore can not dally.Prevent motor idle running by the mode to the motor cutout, structure is simpler, the anti-rotation better effects if.

Description of drawings

The accompanying drawing that constitutes a part of the present utility model is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, does not constitute improper qualification of the present utility model.In the accompanying drawings:

Fig. 1 shows the vibrate schematic diagram of hydraulic circuit of paver in the prior art;

Fig. 2 shows single pump Thomas of the prior art and reaches the schematic diagram that hydraulic system prevents motor idle running;

Fig. 3 shows the schematic diagram when the motor closed hydraulic system forward rotation of single pump driving Thomas is worked in the prior art;

Fig. 4 shows the schematic diagram when the motor closed hydraulic system backward rotation of single pump driving Thomas is worked in the prior art;

Fig. 5 shows in the prior art single pump and drives the motor closed hydraulic system idling of Thomas and treat the schematic diagram in man-hour;

Fig. 6 shows according to the first embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Fig. 7 shows according to first embodiment of the present utility model is in the structural representation that idling is treated man-hour;

The motor closed hydraulic system of single pump Thomas that Fig. 8 shows according to second embodiment of the present utility model is in the structural representation of just changing a job when making state;

The motor closed hydraulic system of single pump Thomas that Fig. 9 shows according to second embodiment of the present utility model is in the structural representation that idling is treated man-hour;

Structural representation when Figure 10 shows the motor closed hydraulic system of single pump Thomas according to second embodiment of the present utility model and is in the counter-rotating working state;

Figure 11 shows according to the 3rd embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Figure 12 shows according to the 3rd embodiment of the present utility model is in the structural representation that idling is treated man-hour;

Figure 13 shows according to the 4th embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Figure 14 shows according to the 4th embodiment of the present utility model is in the structural representation that idling is treated man-hour;

The motor closed hydraulic system of single pump Thomas that Figure 15 shows according to the 5th embodiment of the present utility model is in the structural representation of just changing a job when making state;

Structural representation when Figure 16 shows the motor closed hydraulic system of single pump Thomas according to the 5th embodiment of the present utility model and is in idling and treats man-hour;

Structural representation when Figure 17 shows the motor closed hydraulic system of single pump Thomas according to the 5th embodiment of the present utility model and is in the counter-rotating working state;

Figure 18 shows according to the 6th embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Figure 19 shows according to the 6th embodiment of the present utility model is in the structural representation that idling is treated man-hour;

Figure 20 shows according to the 7th embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Figure 21 shows according to the 7th embodiment of the present utility model is in the structural representation that idling is treated man-hour;

Figure 22 shows according to the 8th embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Figure 23 shows according to the 8th embodiment of the present utility model is in the structural representation that idling is treated man-hour;

Figure 24 shows according to the 9th embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order;

The motor closed hydraulic system of single pump Thomas that Figure 25 shows according to the 9th embodiment of the present utility model is in the structural representation that idling is treated man-hour;

Figure 26 shows according to the tenth embodiment's of the present utility model motor closed hydraulic system of single pump Thomas the structural representation when in running order; And

The motor closed hydraulic system of single pump Thomas that Figure 27 shows according to the tenth embodiment of the present utility model is in the structural representation that idling is treated man-hour.

Embodiment

Hereinafter will describe the utility model with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.

In each accompanying drawing of present embodiment, filled arrows represent the hydraulic oil flow of the high-voltage output end of enclosed pump represent to, hollow arrow the enclosed pump the low pressure input end hydraulic oil flow to.Present embodiment is that example comes each embodiment is described with three motors, first motor 11, second motor 12 and the 3rd motor 13.

Extremely shown in Figure 27 referring to Fig. 6, according to embodiment of the present utility model, the motor closed hydraulic system of single pump Thomas comprises a plurality of motors and enclosed pump 10 that is connected in series with a plurality of motors of serial connection, at a plurality of motor first motors 11, second motor 12 and the 3rd motor 13, enclosed pump 10 and be connected motor and enclosed pump 10 between formed first oil hydraulic circuit of hydraulic pipe line be provided with the cutout control mechanism 20, cutout control mechanism 20 is when the hydraulic system proper functioning, enclosed pump 10 is connected with motor forms first oil hydraulic circuit, treat man-hour in the hydraulic system idling, make enclosed pump 10 by second oil hydraulic circuit of cutout control mechanism 20 formation without motor.The first above-mentioned oil hydraulic circuit does not specifically refer to a certain oil hydraulic circuit, but to general designation through the oil hydraulic circuit of a plurality of motors and enclosed pump 10, when because the switching of the control valve of selector valve when making that hydraulic system forms a plurality of different oil hydraulic circuit through motor and enclosed pump 10, the formed oil hydraulic circuit through motor and enclosed pump 10 of control valve that then is positioned under the current state is the first above-mentioned oil hydraulic circuit.

Be in idling in hydraulic system and treat that can have multiple to the mode of motor cutout man-hour, for example between first delivery line 14 of enclosed pump 10 and second delivery line 15, be connected to form the new hydraulic pipe line in parallel with motor series pipe 16, and by cutout control mechanism 20 pairs of hydraulic oil flows to controlling, wherein first delivery line 14 is at the first end c and wherein between the actuator port a of the first enclosed pump of motor serial connection pipeline 16, second delivery line 15 is between another actuator port b of the second end d of motor serial connection pipeline 16 and the second enclosed pump, make hydraulic oil when hydraulic system is in proper functioning, do not flow through this new hydraulic pipe line and the motor of flowing through, be in that idling treats not flow through man-hour motor and the low pressure input end that directly directly flows back to enclosed pump 10 in hydraulic system through this new hydraulic pipe line, thus formation circuit cycle structure.Be in idling in hydraulic system and treat that man-hour can also be for directly being provided with selector valve to the mode of motor cutout between the high-pressure output tube road of the serial connection hydraulic pipe line at motor place and enclosed pump and low pressure intake line, by regulate selector valve realize to first oil hydraulic circuit (oil hydraulic circuit that forms between motor series pipe 16 and the slippage pump 10) and second oil hydraulic circuit (between selector valve and the slippage pump 10 formation and with motor series pipe 16 disconnected oil hydraulic circuits) selection, thereby realization is to the anti-idle running of motor.

The utility model embodiment's the motor closed hydraulic system of single pump Thomas makes hydraulic oil flow through first oil hydraulic circuit when hydraulic system is in proper functioning, thereby the drive motor normal rotation makes the hydraulic system proper functioning.Be in idling in hydraulic system and treat man-hour, make hydraulic-pressure pump second oil hydraulic circuit of flowing through, and without motor, motor is not connected with hydraulic pipe line between the enclosed pump, no longer include oil and flow to out each motor hydraulic fluid port, the two ends of each motor no longer have pressure difference, can not dally.Prevent motor idle running by the mode to the motor cutout, structure is simpler, the anti-rotation better effects if.

Hydraulic system comprises the motor serial connection pipeline 16 at a plurality of motors place of serial connection, at the first end c of motor serial connection pipeline 16 and first delivery line 14 between the first enclosed pump work hydraulic fluid port a with at second end d of motor serial connection pipeline 16 and second delivery line 15 between the second enclosed pump work hydraulic fluid port b, cutout control mechanism 20 is connected between first delivery line 14 and second delivery line 15, hydraulic system is when proper functioning, cutout control mechanism 20 control enclosed pumps 10 are connected in series pipeline 16 and form first oil hydraulic circuit with motor, the hydraulic system idling is treated man-hour, and cutout control mechanism 20 forms second oil hydraulic circuit with enclosed pump 10.

Cutout control mechanism 20 can comprise the single control valve that is connected on the whole oil hydraulic circuit, also can comprise a plurality of control valves that cooperatively interact, and can also comprise the formed cutout pipeline of a plurality of control valves and connecting pipeline.

When cutout control mechanism 20 comprises a selector valve that is connected simultaneously on first delivery line 14 and second delivery line 15, a plurality of actuator ports of this selector valve are connected with second delivery line 15 respectively at first delivery line 14, thereby control the break-make of first delivery line 14 and second delivery line 15.This selector valve can also directly be communicated with first delivery line 14 and second delivery line 15, thereby makes hydraulic oil directly flow back into enclosed pump 10 behind first delivery line 14, selector valve, second delivery line 15.Selector valve is divided into first connecting pipeline 141 and second connecting pipeline 142 with first delivery line 14, and second delivery line 15 is divided into the 3rd connecting pipeline 151 and the 4th connecting pipeline 152.Selector valve has at least is connected first connecting pipeline 141 and second connecting pipeline 142 and first station that the 3rd connecting pipeline 151 and the 4th connecting pipeline 152 are connected, and second station that makes first connecting pipeline 141 and the 3rd connecting pipeline 151 be connected and second connecting pipeline 142 and the 4th connecting pipeline 152 are not connected, when this selector valve is in second station, no matter enclosed pump 10 is just changeing or is reversing, all the time be not connected between second connecting pipeline 142 and the 4th connecting pipeline 152, also be the state that is not connected between first connecting pipeline 141 and second connecting pipeline 142, also be the state that is not connected between the 3rd connecting pipeline 151 and the 4th connecting pipeline 152.

In conjunction with referring to Fig. 6 and shown in Figure 7, according to first embodiment of the present utility model, selector valve is two six energising magnetic selector valve 21a, and two six energising magnetic selector valve 21a comprise the first actuator port A, the second actuator port B, the 3rd actuator port C, the 4th actuator port D, the 5th actuator port E and the 6th actuator port F.The two ends of first connecting pipeline 141 are connected between the first enclosed pump work hydraulic fluid port a and the first actuator port A, and the two ends of the 3rd connecting pipeline 151 are connected between the second enclosed pump work hydraulic fluid port b and the second actuator port B.Between the first end c that second connecting pipeline 142 is connected motor serial connection pipeline 16 and the 5th actuator port E of two the six magnetic selector valve 21a that switch on; Between the second end d that the 4th connecting pipeline 152 is connected motor serial connection pipeline 16 and the 6th actuator port F of two the six magnetic selector valve 21a that switch on.The 3rd actuator port C and the 4th actuator port D of two six energising magnetic selector valve 21a are connected.

When the spool of two six energising magnetic selector valve 21a was positioned at first station, the first actuator port A and the 5th actuator port E of two six energising magnetic selector valve 21a were connected, and the second actuator port B and the 6th actuator port F are connected; When the spool of two six energising magnetic selector valve 21a is positioned at second station, the first actuator port A and the 3rd actuator port C of two six energising magnetic selector valve 21a are connected, the second actuator port B and the 4th actuator port D are connected, hydraulic oil directly flows back to the second actuator port B from the 4th actuator port D from the first actuator port A behind the 3rd actuator port C, finally flow back to enclosed pump 10.

In conjunction with referring to shown in Figure 6, during machine start proper functioning, these two six energising magnetic selector valve 21a must not, keep the logical oil condition in position, a left side, two six energising magnetic selector valve 21a are in first station, from the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) high pressure oil exported stream all can enter the Thomas by these two six energising magnetic selector valve 21a and reach the loop, gets back to the second enclosed pump work hydraulic fluid port b(of the low pressure input end that is positioned at the enclosed pump or the first enclosed pump work hydraulic fluid port a).Along with enclosed pump output control changes, motor can be done two-way rotation.

In conjunction with referring to shown in Figure 7, when machine enters idling when treating worker's situation, can make two six energising magnetic selector valve 21a get, transfer it to right position logical oily working state, two six energising magnetic selector valve 21a are in first station, from the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) the slippage pump repairing oil stream that flows out directly goes up direct-connected the 3rd actuator port C and the 4th actuator port D by two six energising magnetic selector valve 21a and directly flows back to the second enclosed pump work hydraulic fluid port b(of low pressure input end of enclosed pump 10 or the first enclosed pump work hydraulic fluid port a), no longer enter motor serial connection pipeline 16, motor does not have rotation may.

In conjunction with referring to shown in Fig. 8,9 and 10, according to second embodiment of the present utility model, selector valve is 3-position 4-way solenoid directional control valve 21b, and 3-position 4-way solenoid directional control valve 21b comprises the first actuator port A, the second actuator port B, the 3rd actuator port C and the 4th actuator port D; The two ends of first connecting pipeline 141 are connected between the first enclosed pump work hydraulic fluid port a and the first actuator port A; The two ends of the 3rd connecting pipeline 151 are connected between the second enclosed pump work hydraulic fluid port b and the second actuator port B; Second connecting pipeline 142 is connected between the 3rd actuator port C of the first end c of motor serial connection pipeline 16 and 3-position 4-way solenoid directional control valve 21b; The 4th connecting pipeline 152 is connected between the 4th actuator port D of the second end d of motor serial connection pipeline 16 and 3-position 4-way solenoid directional control valve 21b.

When the spool of 3-position 4-way solenoid directional control valve 21b was positioned at first station, the first actuator port A and the 4th actuator port D of 3-position 4-way solenoid directional control valve 21b were connected, and the second actuator port B and the 3rd actuator port C are connected.When the spool of 3-position 4-way solenoid directional control valve 21b was positioned at second station, the first actuator port A and the second actuator port B of 3-position 4-way solenoid directional control valve 21b were connected, and the 3rd actuator port C and the 4th actuator port D are not connected.When the spool of 3-position 4-way solenoid directional control valve 21b was positioned at the 3rd station, the first actuator port A and the 3rd actuator port C of 3-position 4-way solenoid directional control valve 21b were connected, and the second actuator port B and the 4th actuator port D are connected.

In conjunction with referring to shown in Figure 8, when machine start proper functioning, first end of 3-position 4-way solenoid directional control valve is got, thereby make this valve be in the logical oil condition in position, a left side, this moment, the spool of 3-position 4-way solenoid directional control valve 21b was positioned at first station, the first actuator port A that the high pressure oil that flows out from the first enclosed pump work hydraulic fluid port a flows by this 3-position 4-way solenoid directional control valve 21b flows into, enter motor serial connection pipeline 16 through the 4th actuator port D of 3-position 4-way solenoid directional control valve 21b outflow, flow back to this valve the 3rd actuator port C again and flow out through this valve second actuator port B, get back to the second enclosed pump work hydraulic fluid port b, motor was done and was rotated in the forward this moment.

In conjunction with referring to shown in Figure 10, when the counterrotating of needs motor, can change the electromagnet of this valve second end is got, thereby make the spool of 3-position 4-way solenoid directional control valve 21b be in the 3rd station, the high pressure oil stream that flows out from the first enclosed pump work hydraulic fluid port a is flowed into by this valve first actuator port A, enter motor serial connection pipeline 16 through the 3rd actuator port C outflow, flow back to this valve the 4th actuator port D again and flow out through this valve second actuator port B, get back to the second enclosed pump work hydraulic fluid port b, this moment, motor was done counterrotating.

In conjunction with referring to shown in Figure 9, when machine enters idling when treating worker's situation, the electromagnet that can make these valve two ends all must not electricity, and this valve is in the logical oil condition of meta, thereby makes the spool of 3-position 4-way solenoid directional control valve 21b be in second station.This moment, the first actuator port A of 3-position 4-way solenoid directional control valve 21b directly was communicated with the second actuator port B, the first actuator port A that the slippage pump repairing oil that flows out from the first enclosed pump work hydraulic fluid port a flows by this valve flows into, and by flowing out with the second actuator port B that this first actuator port A directly is communicated with, get back to the second enclosed pump work hydraulic fluid port b of enclosed pump 10, can not enter motor serial connection pipeline 16, motor does not have rotation may.

In conjunction with referring to Figure 11 and shown in Figure 12, according to the 3rd embodiment of the present utility model, selector valve is three eight energising magnetic selector valve 21c, and three eight energising magnetic selector valve 21c comprise the first actuator port A, the second actuator port B, the 3rd actuator port C, the 4th actuator port D, the 5th actuator port E, the 6th actuator port F, the 7th actuator port G and the 8th actuator port H.The two ends of first connecting pipeline 141 are connected between the first enclosed pump work hydraulic fluid port a and the first actuator port A; The two ends of the 3rd connecting pipeline 151 are connected between the second enclosed pump work hydraulic fluid port b and the second actuator port B; Between the first end c that second connecting pipeline 142 is connected motor serial connection pipeline 16 and the 3rd actuator port C of three the eight magnetic selector valve 21c that switch on; Between the second end d that the 4th connecting pipeline 152 is connected motor serial connection pipeline 16 and the 4th actuator port D of three the eight magnetic selector valve 21c that switch on.In this embodiment, the 7th actuator port G and the 8th actuator port H are in sealed condition, do not participate in working procedure.

When the spool of three eight energising magnetic selector valve 21c is positioned at first station, the first actuator port A and the 3rd actuator port C of three eight energising magnetic selector valve 21c are connected, the second actuator port B and the 4th actuator port D are connected, and the 3rd actuator port C and the 4th actuator port D directly are communicated with.When the spool of three eight energising magnetic selector valve 21c is positioned at second station, the first actuator port A and the 5th actuator port E of three eight energising magnetic selector valve 21c are connected, the second actuator port B and the 6th actuator port F are connected, and the 5th actuator port E and the 6th actuator port F are connected.

In conjunction with referring to shown in Figure 11, when machine start proper functioning, the two ends electromagnet of three eight energising magnetic selector valve 21c all must not, this valve be in meta work promptly the spool of three eight energising magnetic selector valve 21c be positioned at second station, the high pressure oil stream that flows out from the first enclosed pump work hydraulic fluid port a is flowed into by this valve first actuator port A, flow to into motor serial connection pipeline 16 through the 5th actuator port E, flow back to this valve the 6th actuator port F again and flow out through the second actuator port B, get back to the second enclosed pump work hydraulic fluid port b of enclosed pump 10, motor is done and is rotated in the forward.When the counterrotating of needs motor, can change the enclosed pump and be output as reverse output, the high pressure oil stream that flows out from the second enclosed pump work hydraulic fluid port b is flowed into by this valve second actuator port B, enter motor serial connection pipeline 16 through the 6th actuator port F outflow, flow back to this valve the 5th actuator port E again and flow out through the first actuator port A, get back to enclosed pump low pressure inlet opening A, thereby make motor do counterrotating.

In conjunction with referring to shown in Figure 12, when machine enters idling when treating worker's situation, it is electric that this valve left end electromagnet is got, and this valve is in the logical oil condition in position, a left side, and the spool of three eight energising magnetic selector valve 21c is positioned at first station.The slippage pump repairing oil stream that flows out from the first enclosed pump work hydraulic fluid port a flows into the 3rd actuator port C outflow by this valve first actuator port A, and by flowing into this valve with the 4th actuator port D that the 3rd actuator port C directly is communicated with, get back to the second enclosed pump work hydraulic fluid port b of enclosed pump 10 then from the second actuator port B, can not enter motor serial connection pipeline 16, motor does not have rotation may.

In conjunction with referring to Figure 13 and shown in Figure 14, according to the 4th embodiment of the present utility model, selector valve is two four-way electromagnetic reversing valve 21d, and two four-way electromagnetic reversing valve 21d comprise the first actuator port A, the second actuator port B, the 3rd actuator port C and the 4th actuator port D.The two ends of first connecting pipeline 141 are connected between the first enclosed pump work hydraulic fluid port a and the first actuator port A; The two ends of the 3rd connecting pipeline 151 are connected between the second enclosed pump work hydraulic fluid port b and the second actuator port B; Second connecting pipeline 142 is connected between the 3rd actuator port C of the first end c of motor serial connection pipeline 16 and two four-way electromagnetic reversing valve 21d; The 4th connecting pipeline 152 is connected between the 4th actuator port D of the second end d of motor serial connection pipeline 16 and two four-way electromagnetic reversing valve 21d.

When the spool of two four-way electromagnetic reversing valve 21d was positioned at first station, the first actuator port A and the 3rd actuator port C of two four-way electromagnetic reversing valve 21d were connected, and the second actuator port B and the 4th actuator port D are connected; When the spool of two four-way electromagnetic reversing valve 21d was positioned at second station, the first actuator port A and the second actuator port B of two four-way electromagnetic reversing valve 21d were connected, and the 3rd actuator port C and the 4th actuator port D are not connected.

In conjunction with referring to shown in Figure 13, when the machine proper functioning, no matter forward work or reverse operation, this valve electromagnet must not, the spool of two four-way electromagnetic reversing valve 21d is positioned at first station, by the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) the high pressure oil stream of output by this valve the first actuator port A and the 3rd actuator port C after enter motor serial connection pipeline 16, flow out through the 4th actuator port D and the second actuator port B then, return the second enclosed pump work hydraulic fluid port b(or the first enclosed pump work hydraulic fluid port a).

In conjunction with referring to shown in Figure 14, when the machine idling is treated man-hour, this valve electromagnet gets, the spool of two four-way electromagnetic reversing valve 21d is positioned at second station, the first actuator port A and the second actuator port B directly are communicated with, making from the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) high pressure oil of output flows through and directly turns back to the second enclosed pump work hydraulic fluid port b(or the first enclosed pump work hydraulic fluid port a) by this valve inside, can not enter motor serial connection pipeline 16 via this valve, motor does not have rotation may.

In conjunction with referring to Figure 15, Figure 16 and shown in Figure 17, according to the 5th embodiment of the present utility model, cutout control mechanism 20 comprises three eight energising magnetic selector valve 21c, the first bidirectional hydraulic lock 22e and the second bidirectional hydraulic lock 23e.Three eight energising magnetic selector valve 21c comprise the first actuator port A, the second actuator port B, the 3rd actuator port C, the 4th actuator port D, the 5th actuator port E, the 6th actuator port F, the 7th actuator port G and the 8th actuator port H.

The first actuator port A is communicated to the first enclosed pump work hydraulic fluid port a, and the second actuator port B is communicated to the second enclosed pump work hydraulic fluid port b; First outlet of the first bidirectional hydraulic lock 22e is communicated to the first end c of motor serial connection pipeline 16, second outlet of the first bidirectional hydraulic lock 22e is communicated to the second end d of motor serial connection pipeline 16, first import of the first bidirectional hydraulic lock 22e is communicated to the 3rd actuator port C, and second import of the first bidirectional hydraulic lock 22e is communicated to the 4th actuator port D.First outlet of the second bidirectional hydraulic lock 23e is communicated to the second end d of motor serial connection pipeline 16, second outlet of the second bidirectional hydraulic lock 23e is communicated to the first end c of motor serial connection pipeline 16, first import of the second bidirectional hydraulic lock 23e is communicated to the 7th actuator port G, and second import of the second bidirectional hydraulic lock 23e is communicated to the 8th actuator port H.The 5th actuator port E is connected with the 6th actuator port F.

When the spool of three eight energising magnetic selector valve 21c was positioned at first station, the first actuator port A and the 3rd actuator port C of three eight energising magnetic selector valve 21c were connected, and the second actuator port B and the 4th actuator port D are connected.When the spool of three eight energising magnetic selector valve 21c was positioned at second station, the first actuator port A and the 5th actuator port E of three eight energising magnetic selector valve 21c were connected, and the second actuator port B and the 6th actuator port F are connected.When the spool of three eight energising magnetic selector valve 21c was positioned at the 3rd station, the first actuator port A and the 7th actuator port G of three eight energising magnetic selector valve 21c were connected, and the second actuator port B and the 8th actuator port H are connected.

In conjunction with referring to shown in Figure 15, when the machine forward is worked, this valve left end electromagnet gets, this valve is in the logical oil in position, a left side, the spool of three eight energising magnetic selector valve 21c is positioned at first station, the high pressure oil stream of first enclosed pump work hydraulic fluid port a output enters this valve flows into bidirectional hydraulic lock through the 3rd actuator port C import from the first actuator port A, open the first bidirectional hydraulic lock 22e this moment, high pressure oil is flowed through and is entered motor serial connection pipeline 16 behind the first bidirectional hydraulic lock 22e, flow into the 4th actuator port D of this valve again via the first bidirectional hydraulic lock 22e, and flow out by the second actuator port B, get back to the second enclosed pump work hydraulic fluid port b; The second bidirectional hydraulic lock 23e can not be opened by working oil stream dieback because of its one-way valve.

In conjunction with referring to shown in Figure 17, when reversal of machine is worked, this valve right-hand member electromagnet gets, this valve is in the logical oil in right position, the spool of three eight energising magnetic selector valve 21c is positioned at the 3rd station, after flowing to this valve first actuator port A, the high pressure oil of first enclosed pump work hydraulic fluid port a output flows out by the 7th actuator port G, and after opening the second bidirectional hydraulic lock 23e, enter motor serial connection pipeline 16, flow into this valve the 8th actuator port H via the second bidirectional hydraulic lock 23e again, and flow out by the second actuator port B, get back to the second enclosed pump work hydraulic fluid port b.The first bidirectional hydraulic lock 22e can not be opened by working oil stream dieback because of its one-way valve.

In conjunction with referring to shown in Figure 16, when the machine idling is treated man-hour, this valve two ends electromagnet all must not, this valve is in the logical oil of meta, this valve core is positioned at second station, first enclosed pump work hydraulic fluid port a output high pressure oil flows to into this valve first actuator port A after get back to this valve by the 5th actuator port E and the 6th actuator port F of direct connection, and returns the second enclosed pump work hydraulic fluid port b by the second actuator port B of this valve.

In conjunction with referring to Figure 18 and shown in Figure 19, according to the 6th embodiment of the present utility model, cutout control mechanism 20 comprises the first two-bit triplet solenoid directional control valve 21f and the second two-bit triplet solenoid directional control valve 22f, the first two-bit triplet solenoid directional control valve 21f is connected on the first end c and the hydraulic pipe line between the first enclosed pump work hydraulic fluid port a of motor serial connection pipeline 16, and the second two-bit triplet solenoid directional control valve 22f is connected on the second end d and the hydraulic pipe line between the second enclosed pump work hydraulic fluid port b of motor serial connection pipeline 16.The first two-bit triplet solenoid directional control valve 21f and the second two-bit triplet solenoid directional control valve 22f include the first actuator port A, the 3rd actuator port C and the 4th actuator port D.

The first actuator port A of the first two-bit triplet solenoid directional control valve 21f is communicated to the first enclosed pump work hydraulic fluid port a, the first actuator port A of the second two-bit triplet solenoid directional control valve 22f is communicated to the second enclosed pump work hydraulic fluid port b, the 3rd actuator port C of the first two-bit triplet solenoid directional control valve 21f is connected to the 3rd actuator port C of the second two-bit triplet solenoid directional control valve 22f, the 4th actuator port D of the first two-bit triplet solenoid directional control valve 21f is communicated to the first end c of motor serial connection pipeline 16, and the 4th actuator port D of the second two-bit triplet solenoid directional control valve 22f is communicated to the second end d of motor serial connection pipeline 16.

In conjunction with referring to shown in Figure 180, when the machine proper functioning, no matter forward work or reverse operation, the electromagnet of the first two-bit triplet solenoid directional control valve 21f and the second two-bit triplet solenoid valve 22f all must not, by the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) output high pressure oil stream enters motor serial connection pipeline 16 by the first two-bit triplet solenoid directional control valve 21f, returns the second enclosed pump work hydraulic fluid port b(or the first enclosed pump work hydraulic fluid port a) via the second two-bit triplet solenoid valve 22f then.

In conjunction with referring to shown in Figure 19, when the machine idling is treated man-hour, the electromagnet of the first two-bit triplet solenoid directional control valve 21f and the second two-bit triplet solenoid valve 22f gets, the first two-bit triplet solenoid directional control valve 21f and second two-bit triplet solenoid valve 22f transposition work, make the output oil stream of enclosed pump 10 not enter motor serial connection pipeline 16 via the first two-bit triplet solenoid directional control valve 21f or the second two-bit triplet solenoid valve 22f, after flow through the first actuator port A and the second actuator port B of the first two-bit triplet solenoid directional control valve 21f from the oil of first enclosed pump work hydraulic fluid port a output, directly from the second actuator port B of the first two-bit triplet solenoid directional control valve 21f the second actuator port B to the second two-bit triplet solenoid valve 22f, then via the first actuator port A of the second two-bit triplet solenoid valve 22f after the second enclosed pump work hydraulic fluid port b flows back to enclosed pump 10, motor does not have rotation may.

In conjunction with referring to Figure 20 and shown in Figure 21, according to the 7th embodiment of the present utility model, cutout control mechanism 20 comprises that first often opens solenoid directional control valve 21g, second and often open solenoid directional control valve 22g and two-way normally closed solenoid directional control valve 23g.First often opens solenoid directional control valve 21g is arranged on first delivery line 14, and first delivery line 14 is divided into first connecting pipeline 141 and second connecting pipeline 142.Second often opens solenoid directional control valve 22g is arranged on second delivery line 15, and second delivery line 15 is divided into the 3rd connecting pipeline 151 and the 4th connecting pipeline 152.Two-way normally closed solenoid directional control valve 23g is connected on the connecting pipeline between first connecting pipeline 141 and the 4th connecting pipeline 152.

In conjunction with referring to shown in Figure 20, when the machine proper functioning, no matter forward work or reverse operation, the electromagnet of three solenoid directional control valves all must not, by the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) output high pressure oil stream often opens solenoid directional control valve 21g(or second by first and often opens solenoid directional control valve 22g) enter motor serial connection pipeline 16, and often open solenoid directional control valve 22g(or first by second and often open solenoid directional control valve 21g) flow out, return the second enclosed pump work hydraulic fluid port b(or the first enclosed pump work hydraulic fluid port a); Two-way around here normally closed solenoid directional control valve 23g has sealed connection first connecting pipeline 141 at its place and the passage of the 3rd connecting pipeline 151, guarantees correct stream output of enclosed pump oil and input.

In conjunction with referring to shown in Figure 21, when the machine idling is treated man-hour, the electromagnet of three solenoid directional control valves all, each valve transposition work, first often opens solenoid directional control valve 21g and second often opens one-way valve on the solenoid directional control valve 22g and has sealed the passage that leads to motor serial connection pipeline, make the oily stream that flows out from the first enclosed pump work hydraulic fluid port a can not enter motor serial connection pipeline 16, can only be through directly returning enclosed pump 10 by two-way normally closed solenoid directional control valve 23g through the second enclosed pump work hydraulic fluid port b, motor does not have rotation may.

In conjunction with referring to Figure 22 and shown in Figure 23, according to the 8th embodiment of the present utility model, cutout control mechanism 20 comprises that first often opens solenoid directional control valve 21g, second and often open solenoid directional control valve 22g and the 3rd two-bit triplet solenoid directional control valve 23h, and the 3rd two-bit triplet selector valve 23h comprises the first actuator port A, the second actuator port B and the 3rd actuator port C.

First often opens solenoid directional control valve 21g is arranged on first delivery line 14, and first delivery line 14 is divided into first connecting pipeline 141 and second connecting pipeline 142; Second often opens solenoid directional control valve 22g is arranged on second delivery line 15, and second delivery line 15 is divided into the 3rd connecting pipeline 151 and the 4th connecting pipeline 152.The 3rd two-bit triplet solenoid directional control valve 23h is connected on the connecting pipeline between first connecting pipeline 141 and the 4th connecting pipeline 152, and connecting pipeline is separated into first section of linking to each other with first connecting pipeline 141 with second section that links to each other with the 3rd connecting pipeline 151, the second actuator port B is communicated to first connecting pipeline, 141, the three actuator port C by first section connecting pipeline and is communicated to the 3rd connecting pipeline 151 by second section connecting pipeline.

When the 3rd two-bit triplet solenoid directional control valve 23h was positioned at first station, the first actuator port A, the second actuator port B and the 3rd actuator port C were not communicated with mutually; When the 3rd two-bit triplet solenoid directional control valve 23h was positioned at second station, the second actuator port B was communicated with the 3rd actuator port C.

In conjunction with referring to shown in Figure 22, when the machine proper functioning, no matter forward work or reverse operation, the electromagnet of three solenoid directional control valves all must not, by the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) output high pressure oil stream often opens solenoid directional control valve 21g(or second by first and often opens solenoid directional control valve 22g) enter motor serial connection pipeline 16, and often open solenoid directional control valve 22g(or first by second and often open solenoid directional control valve 21g) flow out, the flow through second enclosed pump work hydraulic fluid port b(or the first enclosed pump work hydraulic fluid port return enclosed pump 10 after a).The 3rd two-bit triplet solenoid directional control valve 23h has sealed the passage of its place connecting pipeline around here, guarantees correct stream output of enclosed pump oil and input.

In conjunction with referring to shown in Figure 23, when the machine idling is treated man-hour, the electromagnet of three solenoid directional control valves all, each valve transposition work, first often opens solenoid directional control valve 21g and second often opens one-way valve on the solenoid directional control valve 22g and has sealed the passage that leads to motor serial connection pipeline 16, make the oily stream that flows out from the first enclosed pump work hydraulic fluid port a can not enter motor serial connection pipeline 16, the 3rd two-bit triplet solenoid directional control valve 23h that can only be the first actuator port A and the second actuator port B intercommunication via replacing directly turns back to enclosed pump 10 through the second enclosed pump work hydraulic fluid port b, and motor does not have rotation may.

In conjunction with referring to Figure 24 and shown in Figure 25, according to the 9th embodiment of the present utility model, cutout control mechanism 20 comprises a pilot operated directional control valve 21i who is connected simultaneously on first delivery line 14 and second delivery line 15, pilot operated directional control valve 21i is divided into first connecting pipeline 141 and second connecting pipeline 142 with first delivery line 14, second delivery line 15 is divided into the 3rd connecting pipeline 151 and the 4th connecting pipeline 152, and the control port of pilot operated directional control valve 21i is connected with the control oil channel 22i of the valve element position of control pilot operated directional control valve 21i.Pilot operated directional control valve 21i comprises the first actuator port A, the second actuator port B, the 3rd actuator port C and the 4th actuator port D.

The two ends of first connecting pipeline 141 are connected between the first enclosed pump work hydraulic fluid port a and the first actuator port A; The two ends of the 3rd connecting pipeline 151 are connected between the second enclosed pump work hydraulic fluid port b and the second actuator port B; Second connecting pipeline 142 is connected between the 3rd actuator port C of the first end c of motor serial connection pipeline 16 and pilot operated directional control valve 21i; The 4th connecting pipeline 152 is connected between the 4th actuator port D of the second end d of motor serial connection pipeline 16 and pilot operated directional control valve 21i.

When the spool of pilot operated directional control valve 21i was positioned at first station, the first actuator port A and the 4th actuator port D of pilot operated directional control valve 21i were connected, and the second actuator port B and the 3rd actuator port C are connected.When the spool of pilot operated directional control valve 21i was positioned at second station, the first actuator port A and the second actuator port B of pilot operated directional control valve 21i were connected, and the 3rd actuator port C and the 4th actuator port D are not connected.When the spool of pilot operated directional control valve 21i was positioned at the 3rd station, the first actuator port A and the 3rd actuator port C of pilot operated directional control valve were connected, and the second actuator port B and the 4th actuator port D are connected.

Control oil channel 22i comprises that the guide controls oil sources P1, oil sump tank and pilot-actuated valve 221.Pilot-actuated valve 221 is connected the guide and controls between oil sources and the oil sump tank, the first actuator port A of pilot-actuated valve 221 is connected to the guide and controls oil sources, the second actuator port B of pilot-actuated valve 221 is connected to oil sump tank, two actuator ports of pilot-actuated valve 221 are connected to two control ports of pilot operated directional control valve respectively, and this pilot-actuated valve 221 for example is a solenoid directional control valve.Preferably, the delivery outlet of controlling oil sources P1 the guide is provided with throttle valve 222.

In conjunction with referring to shown in Figure 24, when need are made motor to work forward or backwards on request, the electromagnet of pilot-actuated valve 221 is got, the corresponding transposition of pilot operated directional control valve 21i is the work of right position, the spool that is pilot operated directional control valve 21i is in the 3rd station, pump oil and flow to into motor serial connection pipeline 16 and carry out work, and can carry out forward and reverse output according to enclosed pump 10 and change requirement, make the Thomas reach the loop and do rotation forward or backwards.

In conjunction with referring to shown in Figure 25, treat man-hour in machine start just or idling, the electromagnet of the pilot-actuated valve 221 of the control oil channel 22i of this pilot operated directional control valve 21i must not, the control guide controls oil sources P1 and can not enter pilot operated directional control valve 21i, make pilot operated directional control valve 21i keep meta oil return state, the spool that is pilot operated directional control valve 21i is positioned at second station, enclosed pump oil that high-pressure mouth is exported flows to into pilot operated directional control valve 21i and directly returns enclosed pump low pressure port, can not enter motor loop, motor does not have rotation may.This guide controls oil sources P1 can be external oil sources, also can be the pressure oil-source that slippage pump provided by the enclosed pump.

When guide's control valve 221 changes when joining for three-position four-way valve, can make pilot operated directional control valve 21i can about two positions can both work, thereby only depend on pilot-actuated valve 221 control pilot operated directional control valve 21i also can make motor serial connection pipeline 16 do two-way rotation.

In conjunction with referring to Figure 26 and shown in Figure 27, according to the tenth embodiment of the present utility model, cutout control mechanism 20 comprises that the first normally closed solenoid directional control valve 23j, the second normally closed solenoid directional control valve 24j, first often open pilot operated directional control valve 21j and second and often open pilot operated directional control valve 22j; First often opens pilot operated directional control valve 21j is arranged on first delivery line 14, and first delivery line 14 is divided into first connecting pipeline 141 and second connecting pipeline 142; Second often opens pilot operated directional control valve 22j is arranged on second delivery line 15, and second delivery line 15 is divided into the 3rd connecting pipeline 151 and the 4th connecting pipeline 152.

First control port of often opening pilot operated directional control valve 21j is communicated on first connecting pipeline 141 by the first control oil channel 25j, the first normally closed solenoid directional control valve 23j is arranged on the first control oil channel 25j, prevents that hydraulic oil flows to first control port of often opening pilot operated directional control valve 21j from the first control oil channel 25j under the normally off.Second control port of often opening pilot operated directional control valve 22j is communicated on the 3rd connecting pipeline 151 by the second control oil channel 26j, the second normally closed solenoid directional control valve 24j is arranged on the second control oil channel 26j, prevent that hydraulic oil flows to second control port of often opening pilot operated directional control valve 22j from the second control oil channel 26j under the normally off, the first control oil channel 25j and the second control oil channel 26j are intersected in first node K.

During machine clockwise and anticlockwise work, the electromagnet of two normally closed solenoid directional control valves all must not, often open pilot operated directional control valve for two and do not keep logical oil condition because of there being the effect of control oil sources, enclosed pump high-pressure mouth is exported oily stream and can often be opened pilot operated directional control valve 21j through first and enter motor serial connection pipeline 16, flow through then and second return enclosed pump 10 after often opening pilot operated directional control valve 22j, motor can be done positive and negative rotation.

When the machine idling is treated man-hour, the electromagnet that can make two normally closed solenoid directional control valves all, two normally closed solenoid directional control valves all are converted to logical oily working state, act on two control ports of often opening pilot operated directional control valve in parallel behind the oil stream interflow of the first enclosed pump work hydraulic fluid port a and the second enclosed pump work hydraulic fluid port b, make that often opening pilot operated directional control valve for two replaces, seal the first enclosed pump work hydraulic fluid port a(or the second enclosed pump work hydraulic fluid port b) oil flow to passage into motor serial connection pipeline 16, making that each motor does not have rotation may.

According to embodiment of the present utility model, a kind of engineering machinery comprises the motor closed hydraulic system of single pump Thomas, and the motor closed hydraulic system of this list pump Thomas is the above-mentioned motor closed hydraulic system of single pump Thomas.

By adopting the motor closed hydraulic system of single pump Thomas of model utility, can make the motor closed hydraulic system of single pump Thomas be in idling and treat to cut off enclosed pump and the hydraulic circuit of connecting between the hydraulic pipe line man-hour fully, make each motor all not have any rotation possibility in hydraulic system.Thereby bring the extra work load in the time of can avoiding adopting other machinery type to eliminate motor idle running, also can eradicate and adopt when adding mechanical lock and may not remove the hidden danger that mechanical caging causes hydraulic system fault and infringement because of negligence with the idle running of elimination motor.

From above description, as can be seen, the utility model the above embodiments have realized following technique effect: the motor closed hydraulic system of single pump Thomas comprises a plurality of motors and enclosed pump that is connected in series with a plurality of motors of serial connection, at a plurality of motors, the enclosed pump and be connected motor and the enclosed pump between the formed oil hydraulic circuit of hydraulic pipe line be provided with the cutout control mechanism, the cutout control mechanism is when the hydraulic system proper functioning, make enclosed pump and motor form first oil hydraulic circuit, treat man-hour in the hydraulic system idling, make the enclosed pump by second oil hydraulic circuit of cutout control mechanism formation without motor.When the utility model is in proper functioning in hydraulic system, make hydraulic oil flow, thereby the drive motor normal rotation make the hydraulic system proper functioning through first oil hydraulic circuit.Be in idling in hydraulic system and treat man-hour, make hydraulic-pressure pump second oil hydraulic circuit of flowing through, and without motor, motor is not connected with hydraulic pipe line between the enclosed pump, no longer include oil and flow to out each motor hydraulic fluid port, each motor no longer has the power of rotation, therefore can not dally.Prevent motor idle running by the mode to the motor cutout, structure is simpler, the anti-rotation better effects if.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. motor closed hydraulic system of single pump Thomas, it is characterized in that, a plurality of motors and an enclosed pump (10) that is connected in series with a plurality of described motors of comprising serial connection, at a plurality of described motors, described enclosed pump (10) and be connected described motor and described enclosed pump (10) between hydraulic pipe line be provided with the cutout control mechanism (20), described cutout control mechanism (20) is when described hydraulic system proper functioning, described enclosed pump (10) is communicated with connecting pipeline between the described motor forms first oil hydraulic circuit, treat man-hour in described hydraulic system idling, make between described enclosed pump (10) and the described cutout control mechanism (20) to form second oil hydraulic circuit that described second oil hydraulic circuit is not communicated with connecting pipeline between the described motor.

2. the motor closed hydraulic system of single pump Thomas according to claim 1, it is characterized in that, described hydraulic system comprises the motor serial connection pipeline (16) at a plurality of described motor place of serial connection, be positioned at first end and first delivery line (14) between the first enclosed pump work hydraulic fluid port of described motor serial connection pipeline (16) and be positioned at second end of described motor serial connection pipeline (16) and second delivery line (15) between the second enclosed pump work hydraulic fluid port, described cutout control mechanism (20) is connected between described first delivery line (14) and described second delivery line (15), described hydraulic system is when proper functioning, described cutout control mechanism (20) the described enclosed pump of control (10) is connected in series pipeline (16) and forms described first oil hydraulic circuit with described motor, described hydraulic system idling is treated man-hour, and described cutout control mechanism (20) forms described second oil hydraulic circuit with described enclosed pump (10).

3. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises a selector valve that is connected simultaneously on described first delivery line (14) and described second delivery line (15);

Described selector valve is divided into first connecting pipeline (141) and second connecting pipeline (142) with described first delivery line (14), and described second delivery line (15) is divided into the 3rd connecting pipeline (151) and the 4th connecting pipeline (152);

Described selector valve has is connected described first connecting pipeline (141) and described second connecting pipeline (142) and first station that described the 3rd connecting pipeline (151) and described the 4th connecting pipeline (152) are connected, and second station that makes described first connecting pipeline (141) and described the 3rd connecting pipeline (151) be connected and described second connecting pipeline (142) and described the 4th connecting pipeline (152) are not connected.

4. the motor closed hydraulic system of single pump Thomas according to claim 3 is characterized in that,

Described selector valve is two six energising magnetic selector valves (21a), and described two six energising magnetic selector valves (21a) comprise first actuator port, second actuator port, the 3rd actuator port, the 4th actuator port, the 5th actuator port and the 6th actuator port;

The two ends of described first connecting pipeline (141) are connected between described first enclosed pump work hydraulic fluid port and described first actuator port;

The two ends of described the 3rd connecting pipeline (151) are connected between described second enclosed pump work hydraulic fluid port and described second actuator port;

Between first end that described second connecting pipeline (142) is connected described motor serial connection pipeline (16) and described the 5th actuator port of described two the six magnetic selector valves (21a) of switching on;

Between second end that described the 4th connecting pipeline (152) is connected described motor serial connection pipeline (16) and described the 6th actuator port of described two the six magnetic selector valves (21a) of switching on;

The 3rd actuator port and the 4th actuator port of described two six energising magnetic selector valves (21a) are connected;

When the spool of described two six energising magnetic selector valves (21a) is positioned at first station, described first actuator port and described the 5th actuator port of described two six energising magnetic selector valves (21a) are connected, and described second actuator port and described the 6th actuator port are connected;

When the spool of described two six energising magnetic selector valves (21a) is positioned at second station, described first actuator port and described the 3rd actuator port of described two six energising magnetic selector valves (21a) are connected, and described second actuator port and described the 4th actuator port are connected.

5. the motor closed hydraulic system of single pump Thomas according to claim 3 is characterized in that,

Described selector valve is 3-position 4-way solenoid directional control valve (21b), and described 3-position 4-way solenoid directional control valve (21b) comprises first actuator port, second actuator port, the 3rd actuator port and the 4th actuator port;

Described second connecting pipeline (142) is connected between described the 3rd actuator port of first end of described motor serial connection pipeline (16) and described 3-position 4-way solenoid directional control valve (21b);

Described the 4th connecting pipeline (152) is connected between described the 4th actuator port of second end of described motor serial connection pipeline (16) and described 3-position 4-way solenoid directional control valve (21b);

When the spool of described 3-position 4-way solenoid directional control valve (21b) is positioned at first station, described first actuator port and described the 4th actuator port of described 3-position 4-way solenoid directional control valve (21b) are connected, and described second actuator port and described the 3rd actuator port are connected;

When the spool of described 3-position 4-way solenoid directional control valve (21b) is positioned at second station, described first actuator port and described second actuator port of described 3-position 4-way solenoid directional control valve (21b) are connected, and described the 3rd actuator port and described the 4th actuator port are not connected;

When the spool of described 3-position 4-way solenoid directional control valve (21b) is positioned at the 3rd station, described first actuator port and described the 3rd actuator port of described 3-position 4-way solenoid directional control valve (21b) are connected, and described second actuator port and described the 4th actuator port are connected.

6. the motor closed hydraulic system of single pump Thomas according to claim 3 is characterized in that,

Described selector valve is three eight energising magnetic selector valves (21c), and described three eight energising magnetic selector valves (21c) comprise first actuator port, second actuator port, the 3rd actuator port, the 4th actuator port, the 5th actuator port, the 6th actuator port, the 7th actuator port and the 8th actuator port;

Between first end that described second connecting pipeline (142) is connected described motor serial connection pipeline (16) and described the 3rd actuator port of described three the eight magnetic selector valves (21c) of switching on;

Between second end that described the 4th connecting pipeline (152) is connected described motor serial connection pipeline (16) and described the 4th actuator port of described three the eight magnetic selector valves (21c) of switching on;

When the spool of described three eight energising magnetic selector valves (21c) is positioned at first station, described first actuator port and described the 3rd actuator port of described three eight energising magnetic selector valves (21c) are connected, described second actuator port and described the 4th actuator port are connected, and described the 3rd actuator port and described the 4th actuator port directly are communicated with;

When the spool of described three eight energising magnetic selector valves (21c) is positioned at second station, described first actuator port and described the 5th actuator port of described three eight energising magnetic selector valves (21c) are connected, described second actuator port and described the 6th actuator port are connected, and described the 5th actuator port and described the 6th actuator port are connected.

7. the motor closed hydraulic system of single pump Thomas according to claim 3 is characterized in that,

Described selector valve is two four-way electromagnetic reversing valves (21d), and described two four-way electromagnetic reversing valves (21d) comprise first actuator port, second actuator port, the 3rd actuator port and the 4th actuator port;

Described second connecting pipeline (142) is connected between described the 3rd actuator port of first end of described motor serial connection pipeline (16) and described two four-way electromagnetic reversing valves (21d);

Described the 4th connecting pipeline (152) is connected between described the 4th actuator port of second end of described motor serial connection pipeline (16) and described two four-way electromagnetic reversing valves (21d);

When the spool of described two four-way electromagnetic reversing valves (21d) is positioned at first station, described first actuator port and described the 3rd actuator port of described two four-way electromagnetic reversing valves (21d) are connected, and described second actuator port and described the 4th actuator port are connected;

When the spool of described two four-way electromagnetic reversing valves (21d) is positioned at second station, described first actuator port and described second actuator port of described two four-way electromagnetic reversing valves (21d) are connected, and described the 3rd actuator port and described the 4th actuator port are not connected.

8. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises three eight energisings magnetic selector valve (21c), first bidirectional hydraulic lock (22e) and second bidirectional hydraulic locks (23e);

Described three eight energising magnetic selector valves (21c) comprise first actuator port, second actuator port, the 3rd actuator port, the 4th actuator port, the 5th actuator port, the 6th actuator port, the 7th actuator port and the 8th actuator port;

Described first actuator port is communicated to the described first enclosed pump work hydraulic fluid port, and described second actuator port is communicated to the described second enclosed pump work hydraulic fluid port;

First outlet of described first bidirectional hydraulic lock (22e) is communicated to first end of described motor serial connection pipeline (16), second outlet of described first bidirectional hydraulic lock (22e) is communicated to second end of described motor serial connection pipeline (16), first import of described first bidirectional hydraulic lock (22e) is communicated to described the 3rd actuator port, and second import of described first bidirectional hydraulic lock (22e) is communicated to described the 4th actuator port;

First outlet of described second bidirectional hydraulic lock (23e) is communicated to second end of described motor serial connection pipeline (16), second outlet of described second bidirectional hydraulic lock (23e) is communicated to first end of described motor serial connection pipeline (16), first import of described second bidirectional hydraulic lock (23e) is communicated to described the 7th actuator port, and second import of described second bidirectional hydraulic lock (23e) is communicated to described the 8th actuator port;

Described the 5th actuator port is connected with described the 6th actuator port;

When the spool of described three eight energising magnetic selector valves (21c) is positioned at first station, described first actuator port and described the 3rd actuator port of described three eight energising magnetic selector valves (21c) are connected, and described second actuator port and described the 4th actuator port are connected;

When the spool of described three eight energising magnetic selector valves (21c) is positioned at second station, described first actuator port and described the 5th actuator port of described three eight energising magnetic selector valves (21c) are connected, and described second actuator port and described the 6th actuator port are connected;

When the spool of described three eight energising magnetic selector valves (21c) is positioned at the 3rd station, described first actuator port and described the 7th actuator port of described three eight energising magnetic selector valves (21c) are connected, and described second actuator port and described the 8th actuator port are connected.

9. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises the first two-bit triplet solenoid directional control valve (21f) and the second two-bit triplet solenoid directional control valve (22f), the described first two-bit triplet solenoid directional control valve (21f) is connected on first end and the hydraulic pipe line between the described first enclosed pump work hydraulic fluid port of described motor serial connection pipeline (16), and the described second two-bit triplet solenoid directional control valve (22f) is connected on second end and the hydraulic pipe line between the described second enclosed pump work hydraulic fluid port of described motor serial connection pipeline (16);

Described first two-bit triplet solenoid directional control valve (21f) and the described second two-bit triplet solenoid directional control valve (22f) include first actuator port, the 3rd actuator port and the 4th actuator port;

First actuator port of the described first two-bit triplet solenoid directional control valve (21f) is communicated to the described first enclosed pump work hydraulic fluid port, first actuator port of the described second two-bit triplet solenoid directional control valve (22f) is communicated to the described second enclosed pump work hydraulic fluid port, the 3rd actuator port of the described first two-bit triplet solenoid directional control valve (21f) is connected to the 3rd actuator port of the described second two-bit triplet solenoid directional control valve (22f), the 4th actuator port of the described first two-bit triplet solenoid directional control valve (21f) is communicated to first end of described motor serial connection pipeline (16), and the 4th actuator port of the described second two-bit triplet solenoid directional control valve (22f) is communicated to second end of described motor serial connection pipeline (16).

10. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises that first often drives solenoid directional control valve (21g), second and often drive solenoid directional control valve (22g) and two-way normally closed solenoid directional control valve (23g);

Described first often drives solenoid directional control valve (21g) is arranged on described first delivery line (14), and described first delivery line (14) is divided into first connecting pipeline (141) and second connecting pipeline (142);

Described second often drives solenoid directional control valve (22g) is arranged on described second delivery line (15), and described second delivery line (15) is divided into the 3rd connecting pipeline (151) and the 4th connecting pipeline (152);

Described two-way normally closed solenoid directional control valve (23g) is connected on the connecting pipeline between described first connecting pipeline (141) and described the 4th connecting pipeline (152).

11. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises that first often drives solenoid directional control valve (21g), second and often drive solenoid directional control valve (22g) and the 3rd two-bit triplet solenoid directional control valve (23h), and described the 3rd two-bit triplet selector valve (23h) comprises first actuator port, second actuator port and the 3rd actuator port;

Described the 3rd two-bit triplet solenoid directional control valve (23h) is connected on the connecting pipeline between described first connecting pipeline (141) and described the 4th connecting pipeline (152), and described connecting pipeline is separated into first section of linking to each other with described first connecting pipeline (141) with second section that links to each other with described the 3rd connecting pipeline (151), described second actuator port is communicated to described first connecting pipeline (141) by first section described connecting pipeline, and described the 3rd actuator port is communicated to described the 3rd connecting pipeline (151) by second section described connecting pipeline;

When described the 3rd two-bit triplet solenoid directional control valve (23h) was positioned at first station, described first actuator port, second actuator port and the 3rd actuator port were not communicated with mutually;

When described the 3rd two-bit triplet solenoid directional control valve (23h) was positioned at second station, described second actuator port was communicated with described the 3rd actuator port.

12. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises a pilot operated directional control valve (21i) that is connected simultaneously on described first delivery line (14) and described second delivery line (15), described pilot operated directional control valve (21i) is divided into first connecting pipeline (141) and second connecting pipeline (142) with described first delivery line (14), described second delivery line (15) is divided into the 3rd connecting pipeline (151) and the 4th connecting pipeline (152), and the control port of described pilot operated directional control valve (21i) is connected with the control oil channel (22i) of the valve element position of the described pilot operated directional control valve of control (21i);

Described pilot operated directional control valve (21i) comprises first actuator port, second actuator port, the 3rd actuator port and the 4th actuator port;

Described second connecting pipeline (142) is connected between described the 3rd actuator port of first end of described motor serial connection pipeline (16) and described pilot operated directional control valve (21i);

Described the 4th connecting pipeline (152) is connected between described the 4th actuator port of second end of described motor serial connection pipeline (16) and described pilot operated directional control valve (21i);

When the spool of described pilot operated directional control valve (21i) was positioned at first station, described first actuator port and described the 4th actuator port of described pilot operated directional control valve (21i) were connected, and described second actuator port and described the 3rd actuator port are connected;

When the spool of described pilot operated directional control valve (21i) was positioned at second station, described first actuator port and described second actuator port of described pilot operated directional control valve (21i) were connected, and described the 3rd actuator port and described the 4th actuator port are not connected;

When the spool of described pilot operated directional control valve (21i) was positioned at the 3rd station, described first actuator port and described the 3rd actuator port of described pilot operated directional control valve were connected, and described second actuator port and described the 4th actuator port are connected.

13. the motor closed hydraulic system of single pump Thomas according to claim 12 is characterized in that described control oil channel (22i) comprising:

The guide controls oil sources;

Oil sump tank;

Pilot-actuated valve (221), described pilot-actuated valve (221) is connected described guide and controls between oil sources and the described oil sump tank, first actuator port of described pilot-actuated valve (221) is connected to described guide and controls oil sources, second actuator port of described pilot-actuated valve (221) is connected to described oil sump tank, and two actuator ports of described pilot-actuated valve (221) are connected to two control ports of described pilot operated directional control valve respectively.

14. the motor closed hydraulic system of single pump Thomas according to claim 2 is characterized in that,

Described cutout control mechanism (20) comprises that the first normally closed solenoid directional control valve (23j), the second normally closed solenoid directional control valve (24j), first often open pilot operated directional control valve (21j) and second and often open pilot operated directional control valve (22j);

Described first often opens pilot operated directional control valve (21j) is arranged on described first delivery line (14), and described first delivery line (14) is divided into first connecting pipeline (141) and second connecting pipeline (142);

Described second often opens pilot operated directional control valve (22j) is arranged on described second delivery line (15), and described second delivery line (15) is divided into the 3rd connecting pipeline (151) and the 4th connecting pipeline (152);

Described first control port of often opening pilot operated directional control valve (21j) is communicated on described first connecting pipeline (141) by first control oil channel (25j), the described first normally closed solenoid directional control valve (23j) is arranged on described first control oil channel (25j), prevents that hydraulic oil flows to described first control port of often opening pilot operated directional control valve (21j) from described first control oil channel (25j) under the normally off;

Described second control port of often opening pilot operated directional control valve (22j) is communicated on described the 3rd connecting pipeline (151) by second control oil channel (26j), the described second normally closed solenoid directional control valve (24j) is arranged on described second control oil channel (26j), prevent that hydraulic oil flows to described second control port of often opening pilot operated directional control valve (22j) from described second control oil channel (26j) under the normally off, described first control oil channel (25j) is intersected in first node with described second control oil channel (26j).

15. an engineering machinery comprises the motor closed hydraulic system of single pump Thomas, it is characterized in that, the motor closed hydraulic system of described single pump Thomas is the motor closed hydraulic system of each described single pump Thomas in the claim 1 to 14.