CN102877404B - Method and device for controlling milling drum to stop when milling machine backs up and milling machine - Google Patents
Method and device for controlling milling drum to stop when milling machine backs up and milling machine Download PDFInfo
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- CN102877404B CN102877404B CN201210382203.2A CN201210382203A CN102877404B CN 102877404 B CN102877404 B CN 102877404B CN 201210382203 A CN201210382203 A CN 201210382203A CN 102877404 B CN102877404 B CN 102877404B
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- 238000003801 milling Methods 0.000 title claims abstract description 276
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- 239000002828 fuel tank Substances 0.000 claims description 17
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Abstract
A method for controlling the stop of a milling drum when a milling machine backs a car comprises the steps of sensing the oil pressure on a working oil way connected with a working oil port for backing and oil feeding of a walking hydraulic motor (5) of the milling machine; and when the oil pressure is equal to or larger than a preset oil pressure value, controlling a reversing valve corresponding to at least one of a hydraulic clutch (2) of the milling machine and a milling drum transmission belt tensioning oil cylinder (1) to reverse, so that at least one of the hydraulic clutch and the milling drum transmission belt tensioning oil cylinder releases pressure. In addition, the invention also provides a device for realizing the method and a milling machine comprising the device. The method and the device do not need to obtain a reversing signal in a mechanical input mode, the reliability and the safety are greatly improved in an oil pressure sensing mode, the operation is more reliable, the performance is more stable, the device for controlling the milling drum to stop is not easy to damage, and the service life is longer.
Description
Technical field
The present invention relates to a kind of milling machine control method, particularly, when relating to the reversing of a kind of milling machine, control the method for milling and planing drum stall.Further, the invention still further relates to a kind of device for controlling milling and planing drum stall when milling machine is moveed backward.In addition, the invention still further relates to a kind of milling machine, this milling machine comprises the above-mentioned device for controlling milling and planing drum stall when milling machine is moveed backward.
Background technology
Milling machine belongs to the engineering construction machinery extensively adopted in highway engineering construction, wherein one of the milling and planing drum vitals belonging to milling machine of milling machine, milling and planing drum is provided with cutter, by the rotary motion of milling and planing drum and moving forward of milling machine, milling machine can milling road surface thus make evenness of road surface, is convenient to subsequent construction.
Require in the security technology standard of milling machine that milling machine should arrange milling and planing drum safety control, this installation control device is used for automatically stopping the running of milling and planing drum when milling machine is moveed backward and No starting milling and planing drum.
The running gear that current state, inside and outside milling machine extensively adopt is hydraulic drive type running gear, this fluid pressure type running gear operates traveling control crank by operating personnel, travels control crank and controls by flexible axle the change that walking hydraulic pump (typically being manual servo variable pump) realizes travel speed size and travel direction.The running of milling and planing drum adopts machine driving (belt transmission), is engaged realize milling and planing drum stopping and running by solenoid operated directional valve control belt tension and hydraulic clutch.Although be known for those skilled in the art, in order to help skilled in the art to understand, installation control device and the control method thereof of prior art is described referring to Fig. 1 to Fig. 4.
Particularly, Fig. 1 to Fig. 4 shows primary structure and the control principle of the above-mentioned safety control of prior art.See shown in Fig. 1 to Fig. 4, this safety control relates generally to and travels control crank 1, cam 2, contact switch 3, solenoid operated directional valve 4, motor 5, hydraulic clutch 6, walking hydraulic pump 7, flexible axle 8, turgor cylinder 9, driving belt 10, milling and planing drum 11, milling and planing drum startup gauge tap S1, relay K etc.Wherein, as shown in figures 1 and 3, motor 5 generally drives walking hydraulic pump 7 to rotate via transfer gear (not shown) etc., one end of another output shaft of described transfer gear is provided with hydraulic clutch 6 simultaneously, this hydraulic clutch 6 is connected to drive pulley, this drive pulley is connected on the driven pulley on milling and planing drum 11 by driving belt 10, when the clutch disc of hydraulic control clutch 6 engages, the power of motor 5 is via hydraulic clutch 6, drive pulley, driving belt 10 is delivered on driven pulley, thus can rotate by driving milling drum.In addition, shown in Figure 3, effectively power is transmitted in order to make driving belt 10, driving belt 10 also correspondence is provided with hydraulic tensioning mechanism, and this hydraulic tensioning mechanism comprises tensioning hydro-cylinder 9, and one end of the piston rod of this tensioning hydro-cylinder is articulated with the tensioner arm that can rotate, when the piston rod of tensioning hydro-cylinder 9 stretches out, tensioning hydro-cylinder 9 drives tensioner arm to rotate, thus makes the regulating wheel tensioning driving belt 10 of tensioner arm one end, makes driving belt 10 effectively transmit power.Generally speaking, the driving hydraulic oil of tensioning hydro-cylinder 9 and hydraulic clutch 6 by independent auxiliary hydraulic pump supply, can certainly can be supplied by walking hydraulic pump 7.
Therefore, when milling machine is moveed backward, if milling and planing drum 11 will be made automatically to shut down, the clutch disc of hydraulic control clutch 6 is needed to be separated to disconnect power supply, tensioning hydro-cylinder 9 can be made to remove tensioning state, to make, driving belt 10 is lax cannot transmit power simultaneously.
In the prior art, as shown in Figure 2 and Figure 4, when travelling control crank 1 and handling as advanced potential, travelling control crank 1 makes contact switch 3 (switch S 2 in this contact switch and Fig. 4) be in progressive position with moving cam 2, namely switch S 2 contact in Fig. 4 is in the position of disconnection, now because relay is normal closing type relay, therefore can control milling and planing drum as required and start gauge tap S1, with make the solenoid operated directional valve 4 of the oil circuit commutation for hydraulic control clutch 6 and tensioning hydro-cylinder 9 electric, as shown in Figure 2, when solenoid operated directional valve 4(two-position four-way solenoid operated directional valve) electric time, solenoid operated directional valve 4 commutates, what make solenoid operated directional valve in Fig. 2 is in upper state, the hydraulic oil of oil inlet P is fed to hydraulic clutch 6 and tensioning hydro-cylinder 9 via solenoid operated directional valve 4, thus hydraulic clutch 6 engages, tensioning hydro-cylinder 9 tensioning, milling and planing drum 11 is driven in rotation.When giving up the throne after travelling control crank 1 and being operating as, shown in Figure 4, travelling control crank 1 is with moving cam 2 to make contact switch 3 be in going-back position, namely the switch S 2 in Fig. 4 is switched to the position retreating the closing of contact, now the coil of normal closing type relay K obtains electric, thus the contact of this normal closing type relay K is converted to off-state from normally off, now solenoid operated directional valve 4 dead electricity, shown in Figure 2, solenoid operated directional valve 4 returns to the next state shown in Fig. 2 under the effect of back-moving spring, the actuator chamber of hydraulic clutch 6 is communicated with fuel tank via solenoid operated directional valve 4 respectively with the rodless cavity of tensioning hydro-cylinder 9, apparently, now the clutch disc of hydraulic clutch 6 is separated, tensioning hydro-cylinder 9 removes tensioning, thus milling and planing drum 11 cannot obtain power, correspondingly can shut down.It is also to be noted that at this, when contact switch 3 is in going-back position, coil due to normal closing type relay K obtains electric, and the contact series of this normal closing type relay K is on the startup control circuit of milling and planing drum 11, because the contact of now normal closing type relay K is in off-state, therefore no matter how operating personnel operate milling and planing drum starts gauge tap S1, solenoid operated directional valve 4 all cannot be made to obtain electric, thus milling and planing drum 11 also just cannot start when moveing backward, this prevent in milling machine reversing process, the situation making milling and planing drum operate due to maloperation occurs.
As can be seen from upper description, the above-mentioned safety control of prior art forms astern signal mainly through traveling control crank 1 and contact switch 3, relay K responds this signal and solenoid operated directional valve dead electricity is commutated, thus make hydraulic clutch 6 separation and tensioning hydro-cylinder 9 remove tensioning, its essence is that one forms astern signal mechanically, and responds this astern signal by relay and make the control mode that solenoid operated directional valve 4 commutates.
But when the milling machine of above-mentioned prior art is moveed backward, the method that control milling and planing drum shuts down automatically and safety control remain in following defect:
During due to this existing milling machine reversing, astern signal is inputted via contact switch by the mode of mechanical handling, then by control circuit, solenoid operated directional valve 4 is commutated, to control belt tension with lax, hydraulic clutch Engage and disengage, thus realize shutting down of milling and planing drum.But there is the defects such as reliability is low, the life-span is short in the method and apparatus based on contact switch mechanical handling, and reduces reliability and the safety of milling machine.
In view of this, need to design a kind of novel method and device for controlling milling and planing drum stall when milling machine is moveed backward, to overcome or to alleviate the above-mentioned defect of prior art.
Summary of the invention
Technical problem to be solved by this invention controls the method for milling and planing drum stall when being to provide the reversing of a kind of milling machine, the method can make milling and planing drum shut down when milling machine is moveed backward effectively, and operation is reliable, stable.
Further, technical problem to be solved by this invention is to provide a kind of device for controlling milling and planing drum stall when milling machine is moveed backward, and this device can make milling and planing drum shut down when milling machine is moveed backward effectively, and reliable operation, stable performance.
In addition, technical problem to be solved by this invention is to provide a kind of milling machine, and this milling machine can make milling and planing drum shut down when moveing backward, and the control that shuts down is reliable and stable.
In order to solve the problems of the technologies described above, the invention provides a kind of method controlling milling and planing drum stall when milling machine is moveed backward, wherein, the method comprises: the first, the oil pressure in the working oil path that the reversing oil-feed sensing the hydraulic motor travel motor of described milling machine connects with actuator port; Second, when described oil pressure is equal to or greater than default oil pressure value, control the commutation of the reversal valve corresponding at least one in the hydraulic clutch of described milling machine and milling and planing drum driving-belt tensioning hydro-cylinder, to make at least one release in described hydraulic clutch and milling and planing drum driving-belt tensioning hydro-cylinder.
Preferably, in described second step, control described hydraulic clutch and the commutation of the reversal valve corresponding to milling and planing drum driving-belt tensioning hydro-cylinder, to make described hydraulic clutch and the release of milling and planing drum driving-belt tensioning hydro-cylinder simultaneously.
More preferably, the working oil path that the reversing oil-feed of described hydraulic motor travel motor connects with actuator port is provided with pressure switch, in described first step, senses described oil pressure by described pressure switch; In described second step, when described oil pressure is equal to or greater than default oil pressure value, the closing of contact of described pressure switch thus make the power on circuitry residing for this pressure switch, to form the signal of telecommunication that described milling machine is in state of rolling backward, and respond this signal of telecommunication and control corresponding described reversal valve commutation.
Preferably, described hydraulic clutch and milling and planing drum driving-belt tensioning hydro-cylinder share same described reversal valve, this reversal valve at least has two operating positions, make hydraulic oil be fed to the driving oil pocket of described hydraulic clutch and the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder at this reversal valve of the first operating position, at this reversal valve of the second operating position, the driving oil pocket of described hydraulic clutch is communicated with release with fuel tank respectively with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder.
Further, described reversal valve is solenoid operated directional valve, is in described first operating position when this solenoid operated directional valve obtains electric, is in described second operating position during dead electricity.
Further preferably, circuit residing for described pressure switch is also in series with the coil of normal closing type relay, and the contact series of this normal closing type relay is on the control circuit of described solenoid operated directional valve, in described second step, when described pressure switch the closing of contact and when making the power on circuitry residing for this pressure switch, the coil of described normal closing type relay obtains electric, to make the contact of this normal closing type relay disconnect, thus the control circuit of described solenoid operated directional valve disconnects and makes described solenoid operated directional valve dead electricity.
On the basis of the technical scheme of said method of the present invention, the present invention also provides a kind of device for controlling milling and planing drum stall when milling machine is moveed backward, wherein, described device comprises oil pressure sensing element and control element, to sense oil pressure in the working oil path that the reversing oil-feed that this oil pressure sensing element is arranged on the hydraulic motor travel motor of described milling machine connects with actuator port, described control element is when the oil pressure that described oil pressure sensing element senses is equal to or greater than default oil pressure value, respond the astern signal that this oil pressure sensing element is formed and the commutation of the reversal valve corresponding at least one controlled in the hydraulic clutch of described milling machine and milling and planing drum driving-belt tensioning hydro-cylinder, to make at least one release in described hydraulic clutch and milling and planing drum driving-belt tensioning hydro-cylinder.
Preferably, described reversal valve is the solenoid operated directional valve that described hydraulic clutch and milling and planing drum driving-belt tensioning hydro-cylinder share, this solenoid operated directional valve makes hydraulic oil be fed to hydraulic clutch and the milling and planing drum driving-belt tensioning hydro-cylinder of described milling machine when obtaining electric, make this hydraulic clutch and the release of milling and planing drum driving-belt tensioning hydro-cylinder during dead electricity.
Specifically selectively, described solenoid operated directional valve is two-position four-way solenoid operated directional valve, the oil-in of this two-position four-way solenoid operated directional valve and described milling machine for being communicated with to the output oil port of described hydraulic clutch with the auxiliary hydraulic pump of milling and planing drum driving-belt tensioning hydro-cylinder fuel feeding, oil return opening is communicated with fuel tank, first actuator port is communicated with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder with the driving oil pocket of described hydraulic clutch respectively, and the second actuator port is closed; This two-position four-way solenoid operated directional valve makes described oil-in be communicated with described first actuator port when obtaining electric, makes described oil return opening be communicated with described first actuator port during dead electricity.
Preferably, described oil pressure sensing element is pressure switch, described control element is normal closing type relay, and the coils connected in series of this normal closing type relay is on the circuit residing for described pressure switch, and the contact series of this normal closing type relay is on the control circuit of described solenoid operated directional valve.
Particularly, the control circuit of described solenoid operated directional valve is also in series with milling and planing drum and starts gauge tap.
Particularly, the walking hydraulic pump of described hydraulic motor travel motor and described milling machine forms closed type hydraulic system of walking, first actuator port of wherein said walking hydraulic pump is communicated with the advance oil-feed actuator port of described hydraulic motor travel motor via flow divider, second actuator port is communicated with the reversing oil-feed actuator port of described hydraulic motor travel motor, and the inlet port of this walking hydraulic pump is communicated with fuel tank; Described pressure switch is arranged on being communicated with on oil circuit between the second actuator port of described walking hydraulic pump and the reversing oil-feed actuator port of described hydraulic motor travel motor.
Specifically selectively, described walking hydraulic pump is manual servo variable pump.
Particularly, the inlet port of described walking hydraulic pump is communicated with described fuel tank through filter.
In addition, the present invention also provides a kind of milling machine, and wherein, this milling machine comprises the device for controlling milling and planing drum stall when milling machine is moveed backward described in above-mentioned arbitrary technical scheme.
Pass through technique scheme, of the present invention control milling and planing drum stall when moveing backward for planer method and device obtain the astern signal of milling machine by the oil pressure of the reversing oil-feed actuator port sensing hydraulic motor travel motor, and according to this astern signal hydraulic control clutch and/or the release of milling and planing drum driving-belt tensioning hydro-cylinder to make milling and planing drum stall, especially under preferred embodiment, an installation pressure switch in working oil path is connected by the reversing oil-feed at hydraulic motor travel motor with actuator port, astern signal is fed back by pressure switch, and the control circuit of solenoid operated directional valve is disconnected by normal closing type relay, thus solenoid operated directional valve dead electricity, hydraulic clutch and the release of milling and planing drum driving-belt tensioning hydro-cylinder are to make milling and planing drum stall.Compared with being the mechanical input mode by contact switch connecting and disconnecting with the astern signal of prior art, method and apparatus of the present invention is without the need to obtaining astern signal by the mode of machinery input, its mode sensed by oil pressure, reliability and safety improve greatly, its operation is more reliable, performance is more stable, and the device of control milling and planing drum of the present invention stall is not fragile, longer service life.Milling machine of the present invention comprises said apparatus, and therefore it has above-mentioned advantage equally.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Following accompanying drawing is used to provide a further understanding of the present invention, and forms a part for manual, and itself and following detailed description of the invention one are used from explanation the present invention, but protection scope of the present invention is not limited to following the drawings and the specific embodiments.In the accompanying drawings:
Fig. 1 is the simplification structural representation of the device for controlling milling and planing drum stall when milling machine is moveed backward of prior art.
Fig. 2 shows the hydraulic schematic diagram of driving relationship and the electromagnetic switch valve portion travelling control crank and contact switch in the device of the prior art shown in Fig. 1.
Fig. 3 is shown the driving pulley that in the device of the prior art shown in Fig. 1, hydraulic clutch connects and is roused the driving relationship rotated by driving belt driving milling.
Fig. 4 is the circuit theory diagrams of the device of the prior art shown in Fig. 1.
Fig. 5 is the hydraulic schematic diagram for controlling the relevant Hydraulic Elements in the device of milling and planing drum stall when milling machine is moveed backward of the specific embodiment of the invention.
Fig. 6 shows the driving relationship that driving pulley that hydraulic clutch in the specific embodiment of the invention connects is rotated by driving belt driving milling drum.
Fig. 7 is the control circuit schematic diagram of the device for controlling milling and planing drum stall when milling machine is moveed backward of the specific embodiment of the invention.
Fig. 8 is the step block diagram controlling the method for milling and planing drum stall when milling machine is moveed backward of the specific embodiment of the invention.
Description of reference numerals of the present invention:
1 milling and planing drum driving-belt tensioning hydro-cylinder; 2 hydraulic clutches;
3 travel control crank; 4 flow dividers;
5 hydraulic motor travel motors; 6 two-position four-way solenoid operated directional valves;
7 auxiliary hydraulic pumps; 8 fuel tanks;
9 oil filters; 10 walking hydraulic pumps;
11 pressure switches; 12 tension pulleys;
13 driving belts; 14 milling and planing drums.
S1 milling and planing drum starts gauge tap; K1 normal closing type relay.
Detailed description of the invention
Be described in detail to the specific embodiment of the present invention below in conjunction with accompanying drawing, should be understood that, detailed description of the invention described herein is only for instruction and explanation of the present invention, and protection scope of the present invention is not limited to following detailed description of the invention.
First it should be noted that, method for controlling milling and planing drum stall when milling machine is moveed backward of the present invention and device thereof control based on the hydraulic system of existing milling machine and mechanical driving structure, in order to help skilled in the art to understand the present invention following for controlling the method for milling and planing drum stall and the detailed description of the invention of device thereof when milling machine is moveed backward, below relevant hydraulic structure and mechanical driving structure is conceived first with reference to Fig. 5 to Fig. 7 schematic illustration milling machine to of the present invention control, of the present invention for controlling the method for milling and planing drum stall and the detailed description of the invention of device thereof when milling machine is moveed backward by describing in detail on this basis.
Generally speaking, the hydraulic travel system of milling machine drives vehicle wheel rotation by walk motor with hydraulic pressure 5, walk motor with hydraulic pressure 5 typically forms enclosed vibration hydraulic system with walking hydraulic pump 10, particularly, first actuator port B of walking hydraulic pump 10 is via the advance oil-feed actuator port C(of flow divider 4 with the hydraulic motor travel motor 5 and milling machine advance oil-feed actuator port C of hydraulic motor travel motor 5) be communicated with, second actuator port A and the reversing oil-feed actuator port D(of hydraulic motor travel motor 5 and the milling machine of hydraulic motor travel motor 5 are moveed backward oil-feed actuator port D) be communicated with, and the inlet port of this walking hydraulic pump 10 is communicated with fuel tank 8.It should be noted that at this, hydraulic motor travel motor 5 is two or four (i.e. Two-wheeled or four-wheel drive), such as with regard to two-wheel drive, the respective advance oil-feed actuator port C of two hydraulic motor travel motors 5 communicates in the course of the work, and respective reversing oil-feed actuator port D also communicates in the course of the work, be namely parallel way connection between hydraulic motor travel motor 5.Therefore in the description of following detailed description of the invention of the present invention, advance oil-feed actuator port C and reversing oil-feed actuator port D can refer to two hydraulic fluid ports of any one hydraulic motor travel motor, well known, hydraulic motor travel motor 5 has two actuator ports, when milling machine advances, an actuator port (being called " advance oil-feed actuator port the C ") oil-feed of hydraulic motor travel motor 5, and its another actuator port (being called " reversing oil-feed actuator port D ") oil return, now the working oil path of the advance oil-feed actuator port C side of hydraulic motor travel motor 5 belongs to high-pressure side, hydraulic motor travel motor such as rotates forward, when milling machine is moveed backward, hydraulic motor travel motor 5 needs reversion, and oil-feed actuator port D oil-feed of now moveing backward, and oil-feed actuator port C oil return of advancing, the reversing oil-feed working oil path that actuator port D side connects belongs to high-pressure side.The hydraulic structure of the hydraulic motor travel motor 5 of milling machine is known, does not repeat them here.In addition, the rotating of hydraulic motor travel motor 5 switches the oil inlet and oil return direction controlled and realizes mainly through the walking hydraulic pump 10 controlling milling machine, walking hydraulic pump 10 belongs to the known Hydraulic Elements of milling machine, it typically is manual servo variable pump, by the rotating speed and the rotating that regulate the discharge capacity of walking hydraulic pump 10 and pump oil direction can regulate hydraulic motor travel motor 5, walking hydraulic pump 10 generally comprises the first actuator port B, second actuator port A and inlet port, by controlling to travel the servo variable mechanism that control crank 3 regulates walking hydraulic pump 10, walking hydraulic pump 10 can be made from the outside pump oil of the first actuator port B or the second actuator port A, the oil return of hydraulic motor travel motor 5 is then delivered directly to walking hydraulic pump 10 and circulates, because walking hydraulic pump 10 needs to change discharge capacity, the inlet port of walking hydraulic pump 10 is communicated with fuel tank through filter 9, with as required to repairing in closed circuit or make unnecessary hydraulic oil overflow in fuel tank 8.Walking hydraulic pump 10 is generally driven via transfer gear, deceleration device by the engine in situ of milling machine.Certainly, the hydraulic travel system of milling machine is not limited to the above-mentioned canonical form shown in Fig. 5, and hydraulic pump 10 of such as walking also can adopt conventional variable pump, and realizes the oil circuit switching of hydraulic motor travel motor 5 rotating by walking solenoid operated directional valve.In a word, the no matter hydraulic travel system of milling machine how modification, it all can apply the present invention following method and device thereof for controlling milling and planing drum stall when milling machine is moveed backward, correspondingly also just belongs to protection scope of the present invention.
In addition, as described above, the milling and planing drum 14 of milling machine is generally driven by driving belt 13 by the driving pulley that hydraulic clutch 2 connects, wherein hydraulic clutch 2 is arranged on one end of another root output shaft of above-mentioned transfer gear, transmits the power of engine in situ or interrupt power transmission with the joint of the clutch disc by hydraulic clutch 2 or separation.Driving belt 13 correspondence is provided with hydraulic tensioning mechanism, this hydraulic tensioning mechanism comprises milling and planing drum driving-belt tensioning hydro-cylinder 1, one end of the piston rod of this milling and planing drum driving-belt tensioning hydro-cylinder is articulated with the tensioner arm (i.e. tensioner arm can pivotable install) that can rotate, when the piston rod of milling and planing drum driving-belt tensioning hydro-cylinder 1 stretches out, driving tensioner arm rotates, thus make the tension pulley 12 tensioning driving belt 13 of tensioner arm one end, make driving belt 13 effectively transmit power.Typically, shown in Figure 5, the driving hydraulic oil of milling and planing drum driving-belt tensioning hydro-cylinder 1 and hydraulic clutch 2 generally also can be driven via transfer gear by engine in situ by independent auxiliary hydraulic pump 7(, independently drive unit can certainly be adopted) supply, oil circuit supply can certainly be supplied by walking hydraulic pump 7 by corresponding branch.In milling machine, milling and planing drum driving-belt tensioning hydro-cylinder 1 and hydraulic clutch 2 generally share reversal valve, such as adopt a two-position four-way solenoid operated directional valve 6 in conversion valve block in Figure 5, the oil-in of this two-position four-way solenoid operated directional valve 6 is communicated with the output oil port of auxiliary hydraulic pump 7, oil return opening is communicated with fuel tank 8, first actuator port is communicated with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder 1 with the driving oil pocket of hydraulic clutch 2 respectively by the form of branch's oil circuit, and the second actuator port is closed (the two-position four-way solenoid operated directional valve 6 in this conversion valve block is in fact only equivalent to a two position, three-way electromagnetic change valve), this two-position four-way solenoid operated directional valve 6 makes described oil-in be communicated with described first actuator port when obtaining electric, thus hydraulic oil is input to the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder 1 and the driving oil pocket of hydraulic clutch 2 via two-position four-way solenoid operated directional valve 6, the piston rod of milling and planing drum driving-belt tensioning hydro-cylinder 1 is made to stretch out with by belt tension, and the clutch disc of hydraulic clutch 2 engages transmission power, described oil return opening is made to be communicated with described first actuator port during dead electricity, thus make milling and planing drum driving-belt tensioning hydro-cylinder 1 and the release of hydraulic clutch 2 draining, hydraulic clutch 2 disconnects power transmission, the lax effect can not playing transmission of driving belt 13, correspondingly milling and planing drum 14 also will stop the rotation naturally, can find out from here, in fact, as long as any one release in hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1, milling and planing drum 14 all can be made to shut down, certainly in order to strengthen the reliability of control, preferably can make hydraulic clutch 2 and the release simultaneously of milling and planing drum driving-belt tensioning hydro-cylinder 1 simultaneously.It should be noted that at this, although general hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1 share solenoid operated directional valve (such as above-mentioned two-position four-way solenoid operated directional valve) on existing milling machine, and the control circuit of this solenoid operated directional valve is provided with milling and planing drum and starts gauge tap S1, but for those skilled in the art apparently, hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1 are not limited to the situation of shared solenoid operated directional valve, but independently solenoid operated directional valve can be had separately, milling and planing drum starts gauge tap S1 in this case can be linked switch.In addition, the reversal valve that hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1 adopt also is not limited to the form of solenoid operated directional valve.The no matter above-mentioned hydraulic structure of milling machine how modification, as long as it applies technical conceive of the present invention, it all belongs to protection scope of the present invention.
Some typical structures relevant to technical conceive of the present invention and the simple variant structure of milling machine is described above with reference to Fig. 5 to Fig. 7.The detailed description of the invention of the method for controlling milling and planing drum stall when milling machine is moveed backward of the present invention is described based on the above-mentioned hydraulic structure of milling machine and mechanical driving structure below.
Briefly, shown in Figure 8, the method controlling milling and planing drum stall when milling machine is moveed backward of the present invention comprises: the oil pressure in the working oil path that the reversing oil-feed of the hydraulic motor travel motor 5 of sensing milling machine connects with actuator port D.For those skilled in the art significantly, because the reversing oil-feed of hydraulic motor travel motor 5 is used for oil return with actuator port D when milling machine advances, therefore oil pressure is relatively low, and oil-feed is used for when milling machine is moveed backward, now oil pressure is higher, therefore the oil pressure in the working oil path connected with actuator port D by the reversing oil-feed of the hydraulic motor travel motor 5 of sensing milling machine, reliably can obtain the astern signal of milling machine.Thus, when the oil pressure sensed is equal to or greater than default oil pressure value, the commutation of the reversal valve corresponding at least one in the hydraulic clutch 2 of described milling machine and milling and planing drum driving-belt tensioning hydro-cylinder 1 can be controlled, to make at least one release in hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1, thus reach the object of the power supply interrupting milling and planing drum 14, make the natural stall of milling and planing drum 14.In order to strengthen the reliability controlling milling and planing drum 14 stall, preferably, can hydraulic control clutch 2 and the commutation of the reversal valve corresponding to milling and planing drum driving-belt tensioning hydro-cylinder 1, to make hydraulic clutch 2 and the release of milling and planing drum driving-belt tensioning hydro-cylinder 1 simultaneously.
Within the scope of the above-mentioned technical conceive of method of the present invention, can realize controlling by various concrete control form, such as, as the preferred concrete form of implementation of one, shown in Fig. 5 and Fig. 7, hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1 share same solenoid operated directional valve (the two-position four-way solenoid operated directional valve 6 namely shown in Fig. 5), this solenoid operated directional valve at least has two operating positions, hydraulic oil is made to be fed to the driving oil pocket of hydraulic clutch 2 and the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder 1 at this reversal valve of the first operating position, the driving oil pocket of hydraulic clutch 2 is made to be communicated with release with fuel tank respectively with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder 1 at this reversal valve of the second operating position, wherein, described first operating position is in when solenoid operated directional valve obtains electric, described second operating position is in during dead electricity.
The working oil path that the reversing oil-feed of hydraulic motor travel motor 5 connects with actuator port D is provided with pressure switch 11, thus described oil pressure can be sensed by described pressure switch 11, notoriously, pressure switch 11 is when the pressure sensed reaches or surpasses predetermined set value, and the contact of this pressure switch 11 can close.Circuit residing for pressure switch 11 is also in series with the coil of normal closing type relay K1, and the contact series of this normal closing type relay K1 is on the control circuit of described solenoid operated directional valve, when pressure switch 11 the closing of contact and when making the power on circuitry residing for this pressure switch 11, now the coil of normal closing type relay K1 obtains electric, to make the contact of this normal closing type relay K1 disconnect, thus the control circuit of described solenoid operated directional valve disconnects and makes described reversal valve dead electricity.That is, when the oil pressure that pressure switch 11 senses is equal to or greater than default oil pressure value, the closing of contact of pressure switch 11 thus make this power on circuitry residing for pressure switch 11, form the signal of telecommunication that described milling machine is in state of rolling backward, in the above-mentioned preferred embodiment shown in Fig. 5 and Fig. 7, respond this signal of telecommunication by normal closing type relay K1 and control corresponding solenoid operated directional valve commutation.
Above-mentioned detailed description of the invention is only the better embodiment in the technology of the present invention concept, in fact, technical conceive of the present invention is to obtain astern signal by sensing oil pressure, and and then this astern signal corresponding and commutation control is carried out to the reversal valve of hydraulic clutch 2 and/or milling and planing drum driving-belt tensioning hydro-cylinder 1 correspondence, to realize hydraulic clutch 2 and tensioning hydro-cylinder 1 release of milling and planing drum driving-belt and to make milling and planing drum 14 stall.Under stating the enlightenment of technical conceive on the invention; concrete control form of the present invention is not limited in Fig. 7 by situation that normal closing type relay controls solenoid operated directional valve; controller such as can be adopted to receive the fuel injection pressure signal of the sensing of pressure switch 11 or oil pressure sensor; thus obtain the astern signal of milling machine; and controlling pilot operated directional control valve or solenoid operated directional valve commutation etc. according to this astern signal, these simple variant all belong to the protection domain of method of the present invention.
The concrete mode of the device for controlling milling and planing drum stall when milling machine is moveed backward of the present invention is below described.
The device for the control milling and planing drum stall when milling machine is moveed backward of fundamental technics design of the present invention comprises oil pressure sensing element and control element, to sense oil pressure in the working oil path that the reversing oil-feed that this oil pressure sensing element is arranged on the hydraulic motor travel motor 5 of milling machine connects with actuator port D, described control element is when the oil pressure that described oil pressure sensing element senses is equal to or greater than default oil pressure value, respond the astern signal that this oil pressure sensing element is formed and the commutation of the reversal valve corresponding at least one controlled in the hydraulic clutch 2 of milling machine and milling and planing drum driving-belt tensioning hydro-cylinder 1, to make at least one release in hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1.
As mentioned above, within the scope of the above-mentioned technical conceive of device of the present invention, as a kind of concrete preferred implementing form, see shown in Fig. 5 to Fig. 7, above-mentioned reversal valve is the solenoid operated directional valve that hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1 share, this solenoid operated directional valve makes hydraulic oil be fed to hydraulic clutch 2 and milling and planing drum driving-belt tensioning hydro-cylinder 1 when obtaining electric, make this hydraulic clutch 2 and the release of milling and planing drum driving-belt tensioning hydro-cylinder 1 during dead electricity.Such as, more specifically, this solenoid operated directional valve adopts a two-position four-way solenoid operated directional valve 6 integrated in the conversion valve block shown in Fig. 5, the oil-in of this two-position four-way solenoid operated directional valve 6 and milling machine for being communicated with (apparently to described hydraulic clutch 2 with the output oil port of the auxiliary hydraulic pump 7 of milling and planing drum driving-belt tensioning hydro-cylinder 1 fuel feeding, the input hydraulic fluid port (i.e. oil-in) of this auxiliary hydraulic pump 7 needs to be communicated with fuel tank 8 by oil filter 9), the oil return opening of this two-position four-way solenoid operated directional valve 6 is communicated with fuel tank 8, first actuator port is communicated with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder 1 with the driving oil pocket of hydraulic clutch 2 respectively, and the second actuator port is closed, this two-position four-way solenoid operated directional valve 6 makes oil-in be communicated with the first actuator port when obtaining electric by the movement of spool, oil return opening is made to be communicated with the first actuator port during dead electricity, principle about reversal valve is known, do not repeat them here.When adopting solenoid operated directional valve, see Fig. 5 and Fig. 7, oil pressure sensing element in above-mentioned fundamental technics concept can be pressure switch 11, to sense oil pressure in the working oil path that the reversing oil-feed that this pressure switch 11 is arranged on hydraulic motor travel motor 5 connects with actuator port D, above-mentioned control element can be normal closing type relay K1, the coils connected in series of this normal closing type relay K1 is on the circuit residing for described pressure switch 11, and the contact series of this normal closing type relay K1 is on the control circuit of described solenoid operated directional valve.Like this, when milling machine is moveed backward, because the reversing oil-feed of hydraulic motor travel motor 5 drives hydraulic motor travel motor 5 to reverse by the working oil path that actuator port D connects, oil pressure is higher belongs to high-pressure side, default oil pressure value is increased to once oil pressure, the closing of contact of pressure switch 11, when making this power on circuitry residing for pressure switch 11, now the coil of normal closing type relay K1 obtains electric, disconnect to make the contact of this normal closing type relay K1, thus the control circuit of described solenoid operated directional valve disconnects and makes described solenoid operated directional valve dead electricity, correspondingly, hydraulic clutch 2 and the release of milling and planing drum driving-belt tensioning hydro-cylinder 1, interrupt the transmission that milling and planing drum drives power, make the stall of milling and planing drum nature.In addition, the control circuit of described solenoid operated directional valve is generally also in series with milling and planing drum and starts gauge tap S1, when milling machine advances, because the contact of normal closing type relay K1 is in normally off when not triggering, therefore can control solenoid operated directional valve commutation easily by controlling this milling and planing drum startup gauge tap S1, thus the running of milling and planing drum 14 can be started or stoped.Move backward once milling machine, contact due to normal closing type relay K1 is triggered and is in open mode, therefore no matter how operator operates milling and planing drum starts gauge tap S1, the control circuit of solenoid operated directional valve all can not be energized, correspondingly milling and planing drum also just cannot start, and this effectively prevents the situation starting milling and planing drum when milling machine is moveed backward because of maloperation.
In addition, as mentioned above, shown in Figure 5, typically, hydraulic motor travel motor 5 can typically be manual servo variable pump with the walking hydraulic pump 10(of milling machine) form closed type hydraulic system of walking, the pressure switch 11 of above-mentioned preferred embodiment is arranged on being communicated with on oil circuit between the second actuator port A of walking the hydraulic pump 10 and reversing oil-feed actuator port D of hydraulic motor travel motor 5.
In preferred embodiment shown in Fig. 5 to Fig. 8, its main operational principle is: when milling machine advances, the side of the hydraulic motor travel motor 5 residing for pressure switch 11 is low-pressure side, thus pressure switch 11 is in off-state, the contact of normal closing type relay K1 keeps on-state, be energized when milling and planing drum starts solenoid operated directional valve (the two-position four-way solenoid operated directional valve 6 in such as Fig. 5) when gauge tap S1 closes and commutate, hydraulic clutch 2 is engaged, driving belt 13 tensioner, thus realize milling and planing drum 14 and operate.When milling machine reversing retreats, the side of the hydraulic motor travel motor 5 residing for pressure switch 11 changes high-pressure side into, thus pressure switch 11 is connected, the correspondingly coil electricity of normal closing type relay K1, its contact disconnects, and when two-position four-way solenoid operated directional valve 6 power-off, thus makes the driving oil pocket pressure release of driving-belt turgor cylinder 1 rodless cavity and hydraulic clutch 2, hydraulic clutch is separated, driving belt relaxes, thus realizes milling and planing drum and automatically shut down, and ensures safety during milling machine reversing.
Certainly; oil pressure sensing element of the present invention and control element are not limited to the form of above-mentioned pressure switch 11 and normal closing type relay K1; such as oil pressure sensing element can be oil pressure sensor; control element can be controller; controller receives the fuel injection pressure signal of the sensing of oil pressure sensor; thus determine the astern signal of milling machine; and control solenoid operated directional valve commutation according to this astern signal; this is that therefore these simple variant all belong to protection scope of the present invention at application technical conceive of the present invention equally.
On the basis of the technical scheme of the above-mentioned device for controlling milling and planing drum stall when milling machine is moveed backward of the present invention, the present invention also provides a kind of milling machine, and wherein, this milling machine comprises the above-mentioned device for controlling milling and planing drum stall when milling machine is moveed backward.
As can be seen from upper description, the invention has the advantages that: of the present invention control milling and planing drum stall when moveing backward for planer method and device obtain the astern signal of milling machine by the oil pressure of the reversing oil-feed actuator port D sensing hydraulic motor travel motor, and according to this astern signal hydraulic control clutch and/or the release of milling and planing drum driving-belt tensioning hydro-cylinder to make milling and planing drum stall, such as under preferred embodiment, connect an installation pressure switch 11 in working oil path by the reversing oil-feed at hydraulic motor travel motor with actuator port D, astern signal is fed back by pressure switch 11, and the control circuit of solenoid operated directional valve is disconnected by normal closing type relay 11, thus solenoid operated directional valve dead electricity, hydraulic clutch and the release of milling and planing drum driving-belt tensioning hydro-cylinder are to make milling and planing drum stall.This and the astern signal of prior art are compared with the mechanical input mode by contact switch, method and apparatus of the present invention is without the need to obtaining astern signal by the mode of machinery input, therefore reliability and safety improve greatly, its operation is more reliable, performance is more stable, and the device of control milling and planing drum of the present invention stall is not fragile, longer service life.Milling machine of the present invention comprises said apparatus, and therefore it has above-mentioned advantage equally.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (15)
1. control the method for milling and planing drum stall when milling machine is moveed backward, wherein, the method comprises:
First step, the oil pressure in the working oil path that the reversing oil-feed sensing the hydraulic motor travel motor (5) of described milling machine connects with actuator port (D);
Second step, when described oil pressure is equal to or greater than default oil pressure value, control the commutation of the reversal valve corresponding at least one in the hydraulic clutch (2) of described milling machine and milling and planing drum driving-belt tensioning hydro-cylinder (1), to make at least one release in described hydraulic clutch (2) and milling and planing drum driving-belt tensioning hydro-cylinder (1).
2. method according to claim 1, wherein, in described second step, control described hydraulic clutch (2) and the commutation of the reversal valve corresponding to milling and planing drum driving-belt tensioning hydro-cylinder (1), to make described hydraulic clutch (2) and milling and planing drum driving-belt tensioning hydro-cylinder (1) release simultaneously.
3. method according to claim 1 and 2, wherein, the working oil path that the reversing oil-feed of described hydraulic motor travel motor (5) connects with actuator port (D) is provided with pressure switch (11), in described first step, sense described oil pressure by described pressure switch (11); In described second step, when described oil pressure is equal to or greater than default oil pressure value, the closing of contact of described pressure switch (11) thus make the power on circuitry residing for this pressure switch (11), to form the signal of telecommunication that described milling machine is in state of rolling backward, and respond this signal of telecommunication and control corresponding described reversal valve commutation.
4. method according to claim 3, wherein, described hydraulic clutch (2) and milling and planing drum driving-belt tensioning hydro-cylinder (1) share same described reversal valve, this reversal valve at least has two operating positions, hydraulic oil is made to be fed to the driving oil pocket of described hydraulic clutch (2) and the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder (1) at this reversal valve of the first operating position, at this reversal valve of the second operating position, the driving oil pocket of described hydraulic clutch (2) is communicated with release respectively with fuel tank with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder (1).
5. method according to claim 4, wherein, described reversal valve is solenoid operated directional valve, is in described first operating position when this solenoid operated directional valve obtains electric, is in described second operating position during dead electricity.
6. method according to claim 5, wherein, circuit residing for described pressure switch (11) is also in series with the coil of normal closing type relay (K1), and the contact series of this normal closing type relay (K1) is on the control circuit of described solenoid operated directional valve, in described second step, when described pressure switch (11) the closing of contact and when making the power on circuitry residing for this pressure switch (11), the coil of described normal closing type relay (K1) obtains electric, disconnect to make the contact of this normal closing type relay (K1), thus the control circuit of described solenoid operated directional valve disconnects and makes described solenoid operated directional valve dead electricity.
7. for controlling the device of milling and planing drum stall when milling machine is moveed backward, wherein, described device comprises oil pressure sensing element and control element, to sense oil pressure in the working oil path that the reversing oil-feed that this oil pressure sensing element is arranged on the hydraulic motor travel motor (5) of described milling machine connects with actuator port (D), described control element is when the oil pressure that described oil pressure sensing element senses is equal to or greater than default oil pressure value, respond astern signal that this oil pressure sensing element formed and the reversal valve corresponding at least one controlled in the hydraulic clutch (2) of described milling machine and milling and planing drum driving-belt tensioning hydro-cylinder (1) commutates, to make at least one release in described hydraulic clutch (2) and milling and planing drum driving-belt tensioning hydro-cylinder (1).
8. device according to claim 7, wherein, described reversal valve is the solenoid operated directional valve that described hydraulic clutch (2) and milling and planing drum driving-belt tensioning hydro-cylinder (1) share, this solenoid operated directional valve makes hydraulic oil be fed to hydraulic clutch (2) and the milling and planing drum driving-belt tensioning hydro-cylinder (1) of described milling machine when obtaining electric, make this hydraulic clutch (2) and milling and planing drum driving-belt tensioning hydro-cylinder (1) release during dead electricity.
9. device according to claim 8, wherein, described solenoid operated directional valve is two-position four-way solenoid operated directional valve (6), the oil-in of this two-position four-way solenoid operated directional valve (6) and described milling machine for being communicated with to the output oil port of described hydraulic clutch (2) with the auxiliary hydraulic pump (7) of milling and planing drum driving-belt tensioning hydro-cylinder (1) fuel feeding, oil return opening is communicated with fuel tank (8), first actuator port is communicated with the rodless cavity of milling and planing drum driving-belt tensioning hydro-cylinder (1) with the driving oil pocket of described hydraulic clutch (2) respectively, and the second actuator port is closed, this two-position four-way solenoid operated directional valve (6) makes described oil-in be communicated with described first actuator port when obtaining electric, makes described oil return opening be communicated with described first actuator port during dead electricity.
10. device according to claim 8 or claim 9, wherein, described oil pressure sensing element is pressure switch (11), described control element is normal closing type relay (K1), the coils connected in series of this normal closing type relay (K1) is on the circuit residing for described pressure switch (11), and the contact series of this normal closing type relay (K1) is on the control circuit of described solenoid operated directional valve.
11. devices according to claim 10, wherein, the control circuit of described solenoid operated directional valve are also in series with milling and planing drum and start gauge tap (S1).
12. devices according to claim 10, wherein, described hydraulic motor travel motor (5) forms with the walking hydraulic pump (10) of described milling machine closed type hydraulic system of walking, first actuator port (B) of wherein said walking hydraulic pump (10) is communicated with the advance oil-feed actuator port (C) of described hydraulic motor travel motor (5) via flow divider (4), second actuator port (A) is communicated with the reversing oil-feed actuator port (D) of described hydraulic motor travel motor (5), and the inlet port of this walking hydraulic pump (10) is communicated with fuel tank (8), described pressure switch (11) is arranged on being communicated with on oil circuit between second actuator port (A) of described walking hydraulic pump (10) and the reversing oil-feed actuator port (D) of described hydraulic motor travel motor (5).
13. devices according to claim 12, wherein, described walking hydraulic pump is manual servo variable pump.
14. devices according to claim 12, wherein, the inlet port of described walking hydraulic pump (10) is communicated with fuel tank (8) through filter (9).
15. milling machines, wherein, this milling machine comprises the device for controlling milling and planing drum stall when milling machine is moveed backward according to any one of claim 7 to 14.
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| CN107916611B (en) * | 2016-10-25 | 2023-05-30 | 宝鸡文理学院 | Indexable multifunctional road maintenance machine |
| CN109901545A (en) * | 2017-12-08 | 2019-06-18 | 柳工常州机械有限公司 | A kind of bull-dozer safety control system and method |
| CN109099020A (en) * | 2018-08-31 | 2018-12-28 | 三汽车制造有限公司 | Milling machine auxiliary control hydraulic system and milling machine |
| CN111673516A (en) * | 2020-06-30 | 2020-09-18 | 龙岩市武平县谨行科技有限公司 | Driving device of steel production cutting equipment |
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| CN2906253Y (en) * | 2006-02-27 | 2007-05-30 | 李万宝 | Indoor water-leakage protection device |
| CN101881006A (en) * | 2010-07-15 | 2010-11-10 | 莱州市精磊机械有限公司 | High speed railway box girder milling machine |
| CN102168401A (en) * | 2011-05-27 | 2011-08-31 | 长安大学 | Constant-pressure ground-connection control method for rear door of pavement planer |
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|---|---|---|---|---|
| CN2906253Y (en) * | 2006-02-27 | 2007-05-30 | 李万宝 | Indoor water-leakage protection device |
| CN101881006A (en) * | 2010-07-15 | 2010-11-10 | 莱州市精磊机械有限公司 | High speed railway box girder milling machine |
| CN102168401A (en) * | 2011-05-27 | 2011-08-31 | 长安大学 | Constant-pressure ground-connection control method for rear door of pavement planer |
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