CN105201938A - Reversing system for machining tool - Google Patents

Reversing system for machining tool Download PDF

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Publication number
CN105201938A
CN105201938A CN201510587392.0A CN201510587392A CN105201938A CN 105201938 A CN105201938 A CN 105201938A CN 201510587392 A CN201510587392 A CN 201510587392A CN 105201938 A CN105201938 A CN 105201938A
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China
Prior art keywords
fluid port
hydraulic fluid
valve
hydraulic
selector valve
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CN201510587392.0A
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Chinese (zh)
Inventor
江涛
沙文瀚
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WUHU RESEARCH INSTITUTE OF INSTITUTE TECHNOLOGY OF AUTOMOBILE Co Ltd
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WUHU RESEARCH INSTITUTE OF INSTITUTE TECHNOLOGY OF AUTOMOBILE Co Ltd
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Priority to CN201510587392.0A priority Critical patent/CN105201938A/en
Publication of CN105201938A publication Critical patent/CN105201938A/en
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Abstract

The invention discloses a reversing system for a machining tool, and belongs to the field of mechanical equipment. The reversing system comprises a hydraulic cylinder, wherein a piston is arranged in the hydraulic cylinder, and divides the hydraulic cylinder into a first hydraulic cavity and a second hydraulic cavity which are arranged side by side; a reversing valve comprises a reversing valve push valve core arranged in the inner cavity of the reversing valve; a pilot valve comprises a pilot valve push valve core arranged in the inner cavity of the pilot valve, and a push valve rod connected with the pilot valve push valve core; the pilot valve is communicated with the reversing valve; a hydraulic pump is communicated with the reversing valve; one end of a shifter lever is connected with the push valve rod; the other end of the shifter lever is arranged in a cavity in the middle of an iron stopper arranged on the machining tool; the iron stopper is connected with the piston; the piston drives the push valve rod to move through the iron stopper and the shifter lever. The reversing system for the machining tool enables the hydraulic cylinder to obtain extremely high reversing position precision, and is steady and reliable in reversing, sensitive and impact-free.

Description

For the reversing mechanism of working machine tool
Technical field
The present invention relates to technical field of mechanical equipment, particularly for the reversing mechanism of working machine tool.
Background technique
Selector valve is the position control valve with two or more liquid form and two or more hydraulic fluid port, is to realize the communication of flow of pressurized, cut-out and commutation, and the valve that discharge degree and sequentially-operating control.Pilot valve is control mechanism for handling in other valves or element and the Auxiliary valves used.Selector valve is due to flow rate fine-tuning characteristic, and operation and replacement simply, are therefore used widely in engineering.But be easily subject to the impact of load variations, and the energy consumption of meta oil return is large, Operational Figure Of Merit is too high.
Summary of the invention
In order to solve at least one aspect of the above-mentioned problems in the prior art and defect, the invention provides a kind of reversing mechanism for working machine tool.Described technological scheme is as follows:
An object of the present invention is to provide a kind of reversing mechanism for working machine tool.
According to an aspect of the present invention, provide a kind of reversing mechanism for working machine tool, described reversing mechanism comprises:
Oil hydraulic cylinder, is provided with piston in described oil hydraulic cylinder, and described oil hydraulic cylinder is separated into the first hydraulic pressure cavity and the second hydraulic pressure cavity that are arranged side by side each other by described piston;
Selector valve, described selector valve comprises selector valve in the inner chamber being arranged on described selector valve and promotes spool, and described selector valve respectively with described first hydraulic pressure cavity and described second hydraulic chamber into communication;
Pilot valve, described pilot valve comprises pilot valve in the inner chamber being arranged on described pilot valve to be promoted spool, promotes the promotion valve rod that spool is connected with described guide, and described pilot valve and described selector valve communicate with each other;
Oil hydraulic pump, described oil hydraulic pump is communicated with described selector valve;
Driving lever, one end of described driving lever is connected with described and described promotion valve rod, the other end of described driving lever is arranged in the cavity of the centre of the buting iron on described working machine tool, and described buting iron is connected with described piston, and described piston drives described promotion valve rod to move by described buting iron and described driving lever;
In use, by the movement of the promotion spool of described pilot valve and the promotion spool of described selector valve to realize the commutation of the piston in described oil hydraulic cylinder.
Particularly, described selector valve comprises the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port and the 5th hydraulic fluid port, described first hydraulic fluid port is arranged on the first end of described selector valve, described second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port and the 5th hydraulic fluid port all successively and come between the first end of described selector valve and the second end, and the first end of described selector valve and the second end positioned opposite to each other.
Further, described first hydraulic pressure cavity is connected to each other by the 3rd hydraulic fluid port of the first oil circuit and described selector valve, described second hydraulic pressure cavity is connected to each other by the 5th hydraulic fluid port of the second oil circuit and described selector valve, and the 4th hydraulic fluid port of described selector valve is connected with described oil hydraulic pump by the 3rd oil circuit
The promotion spool of described selector valve is provided with selector valve annular undercut groove, and each hydraulic fluid port that described selector valve is arranged is communicated with by the oil circuit that described selector valve annular undercut groove is corresponding to described reversing mechanism.
Further, described pilot valve comprises the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port, first hydraulic fluid port of described pilot valve, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port are disposed side by side between the first end of described pilot valve and the second end successively along the longitudinal direction of described promotion valve rod, and the first end of described pilot valve and the second end positioned opposite to each other.
Particularly, first hydraulic fluid port of described pilot valve is connected with the first hydraulic fluid port of described selector valve by the 4th oil circuit, second hydraulic fluid port of described pilot valve is connected with the second hydraulic fluid port of described selector valve by the 5th oil circuit, and the 4th hydraulic fluid port of described pilot valve is connected with the 6th hydraulic fluid port of described selector valve by the 6th oil circuit.
Particularly, the promotion spool of described pilot valve is provided with pilot valve annular undercut groove, each hydraulic fluid port that described pilot valve is arranged is communicated with by the oil circuit that described pilot valve annular undercut groove is corresponding to described reversing mechanism,
3rd hydraulic fluid port of described pilot valve is the oil outlet of described reversing mechanism.
Further, when described oil hydraulic pump injects hydraulic pressure by the 3rd oil circuit to described selector valve, described hydraulic pressure by the 3rd hydraulic fluid port opened of described selector valve and the 4th hydraulic fluid port by described hydraulic pressure transfer to described second oil circuit, pass through the second oil circuit afterwards by described hydraulic pressure transfer to described second hydraulic pressure cavity, realize piston to move along the longitudinal direction of described oil hydraulic cylinder towards the first end of described oil hydraulic cylinder, and drive described promotion valve rod to move towards the second end of described pilot valve by described buting iron and described driving lever;
Afterwards, described hydraulic pressure in described first hydraulic pressure cavity is passed to the 3rd hydraulic fluid port opened of described selector valve by the first oil circuit, and successively by the 3rd hydraulic fluid port of described selector valve and the second hydraulic fluid port by described hydraulic pressure transfer to described 5th oil circuit, the hydraulic pressure afterwards in the 5th oil circuit flows out described reversing mechanism by the second hydraulic fluid port of pilot valve and the 3rd hydraulic fluid port successively.
Further, described piston drives described promotion valve rod to after the second end of described pilot valve moves by described buting iron and described driving lever, described promotion valve rod drives described promotion spool move to open the first hydraulic fluid port of described pilot valve towards the second end of described pilot valve and close the 3rd hydraulic fluid port, from the described flow of pressurized of the 3rd hydraulic fluid port of described pilot valve to the first hydraulic fluid port of described pilot valve, and flow to by the 4th oil circuit in the first hydraulic fluid port of described selector valve and move with second end of the promotion spool promoting described selector valve towards described selector valve.
Further, when described selector valve promotion spool towards the second end of described selector valve move and the second end in contact with described selector valve time, the promotion spool of described selector valve closes passage between the 4th hydraulic fluid port of described selector valve and the 5th hydraulic fluid port, the hydraulic pressure coming from described oil hydraulic pump flow in the 4th hydraulic fluid port of described selector valve by described 3rd oil circuit, and flow in described first oil circuit by the 4th hydraulic fluid port of selector valve and the 3rd hydraulic fluid port successively, and flow in described first hydraulic pressure cavity by the first oil circuit, the second end arranged along the longitudinal direction of described oil hydraulic cylinder towards the first end relative to described oil hydraulic cylinder to realize described piston moves, described piston drives the promotion valve rod of described pilot valve to move towards the first end of described pilot valve by described buting iron and driving lever simultaneously, and drive the promotion spool of described pilot valve to open the 4th hydraulic fluid port of described pilot valve,
And the hydraulic pressure in described second oil hydraulic cylinder flow in the 5th hydraulic fluid port of described selector valve by described second oil circuit, flow in described 6th oil circuit by the 6th hydraulic fluid port of selector valve afterwards, the 3rd hydraulic fluid port finally by pilot valve flows out described reversing mechanism.
Further, described 4th oil circuit is provided with one-way valve, and the feed liquor port of described one-way valve is communicated with the first hydraulic fluid port of described pilot valve, and the fluid port of described one-way valve is communicated with the first hydraulic fluid port of described selector valve;
3rd oil port of described pilot valve is provided with throttle valve;
The shoulders of the promotion spool of described pilot valve and the promotion spool of selector valve is all set to conic section.
The beneficial effect of technological scheme provided by the invention is: the reversing mechanism for working machine tool provided by the invention can make oil hydraulic cylinder obtain very high commutation position precision, and commutation is steadily reliable, sensitive in impacting.
Accompanying drawing explanation
Fig. 1 is the structural representation of the reversing mechanism for working machine tool according to an embodiment of the invention;
Fig. 2 is the structural representation of the selector valve shown in Fig. 1;
Fig. 3 is the structural representation of the pilot valve shown in Fig. 1.
Wherein, 100 for the reversing mechanism of working machine tool, 10 oil hydraulic cylinders, 11 first hydraulic pressure cavity, 12 second hydraulic pressure cavity, 13 pistons, the first end of 14 oil hydraulic cylinders, second end of 15 oil hydraulic cylinders, 20 selector valves, 21 selector valves promote spool, first hydraulic fluid port of 22 selector valves, second hydraulic fluid port of 23 selector valves, 3rd hydraulic fluid port of 24 selector valves, 4th hydraulic fluid port of 25 selector valves, 5th hydraulic fluid port of 26 selector valves, 6th hydraulic fluid port of 27 selector valves, 281 first selector valve annular undercut grooves, 282 second selector valve annular undercut grooves, the first end of 28 selector valves, second end of 29 selector valves, 30 pilot valves, 31 pilot valves promote spool, 32 promote valve rod, first hydraulic fluid port of 33 pilot valves, second hydraulic fluid port of 34 pilot valves, 3rd hydraulic fluid port of 35 pilot valves, 351 throttle valve, 4th hydraulic fluid port of 36 pilot valves, the first end of 37 pilot valves, second end of 38 pilot valves, 391 first pilot valve annular undercut grooves, 392 second pilot valve annular undercut grooves, 393 the 3rd pilot valve annular undercut grooves, 40 oil hydraulic pumps, 50 driving levers, 60 buting iron, the cavity of 61 buting iron, 71 first oil circuits, 72 second oil circuits, 73 the 3rd oil circuits, 74 the 4th oil circuits, 741 one-way valves, 75 the 5th oil circuits, 76 the 6th oil circuits.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
See Fig. 1, it illustrates the reversing mechanism 100 for working machine tool according to an embodiment of the invention.Reversing mechanism 100 comprises: oil hydraulic cylinder 10, selector valve 20, pilot valve 30, oil hydraulic pump 40 and driving lever 50.Particularly, in oil hydraulic cylinder 10, be provided with piston 13, by piston 13, oil hydraulic cylinder 10 be separated into the first hydraulic pressure cavity 11 and the second hydraulic pressure cavity 12 be arranged side by side each other.The selector valve that selector valve 20 comprises in the inner chamber being arranged on selector valve 20 promotes spool 21, and selector valve 20 is communicated with the second hydraulic pressure cavity 12 with the first hydraulic pressure cavity 11 respectively.Pilot valve 30 comprises pilot valve in the inner chamber being arranged on pilot valve 30 to be promoted spool 31, promotes the promotion valve rod 32 that spool 31 is connected with pilot valve, and pilot valve 30 and selector valve 20 communicate with each other, and oil hydraulic pump 40 and selector valve 20 communicate with each other.One end of driving lever 50 is connected with promotion valve rod 32, and the other end of driving lever 50 is arranged in the cavity 61 of the centre of the buting iron 60 on working machine tool, and buting iron 60 is connected with piston 13, and piston 13 drives promotion valve rod 32 to move by buting iron 60 and driving lever 50.In use, promote spool 31 by pilot valve and promote the movement of spool 21 to realize the commutation of the piston 13 in oil hydraulic cylinder 10 with selector valve.
Specifically see Fig. 2, selector valve 20 comprises the first hydraulic fluid port 22, second hydraulic fluid port 23, the 3rd hydraulic fluid port 24, the 4th hydraulic fluid port 25, the 5th hydraulic fluid port 26 and the 6th hydraulic fluid port 27.Particularly, first hydraulic fluid port 22 of selector valve 20 is arranged on the first end 28 of selector valve 20, second hydraulic fluid port 23 of selector valve 20, the 3rd hydraulic fluid port 24, the 4th hydraulic fluid port 25, the 5th hydraulic fluid port 26 and the 6th hydraulic fluid port 27 all successively and come between the first end 28 of selector valve 20 and the second end 29, and the first end 28 of selector valve 20 and the second end 29 positioned opposite to each other.
Particularly, shown in composition graphs 1 and Fig. 2, first hydraulic pressure cavity 11 is connected to each other by the 3rd hydraulic fluid port 24 of the first oil circuit 71 with selector valve 20, and the oil circuit that the second hydraulic pressure cavity 12 passes through the annular undercut groove 28 of selector valve corresponding with reversing mechanism 100 by each hydraulic fluid port that the 5th hydraulic fluid port 26 of the second oil circuit 72 and selector valve 20 each other selector valve 20 are arranged is communicated with.4th hydraulic fluid port 25 of selector valve 20 is connected with oil hydraulic pump 40 by the 3rd oil circuit 73.In an example of the present invention, promote spool 21 to be provided with the first selector valve annular undercut groove 281 and the second selector valve annular undercut groove 282 at selector valve.The first hydraulic fluid port 22, second hydraulic fluid port 23, the 3rd hydraulic fluid port 24, the 4th hydraulic fluid port 25 and the 5th hydraulic fluid port 26 on selector valve 20 is communicated with each other with each oil circuit in reversing mechanism 100 with realization by the movement of selector valve 20 by the first selector valve annular undercut groove 281 and the second selector valve annular undercut groove 282 respectively, thus realize the commutation of oil circuit in reversing mechanism 100, and then realize the commutation of piston movement.Certain those skilled in the art can understand, the annular undercut groove on selector valve 20 can be set to 1,3 or more as required.
See Fig. 3, pilot valve 30 comprises the first hydraulic fluid port 33, second hydraulic fluid port 34, the 3rd hydraulic fluid port 35 and the 4th hydraulic fluid port 36.The longitudinal direction that first hydraulic fluid port 33, second hydraulic fluid port 34, the 3rd hydraulic fluid port 35 and the 4th hydraulic fluid port 36 promote valve rod 32 along pilot valve is disposed side by side between the first end 37 of pilot valve 30 and the second end 38 successively, and the first end 37 of pilot valve 30 and the second end 38 positioned opposite to each other, wherein the 3rd hydraulic fluid port 35 of pilot valve 30 is the oil outlet of reversing mechanism 100, and the 3rd hydraulic fluid port 35 place of pilot valve 30 is provided with throttle valve 351.Shown in concrete composition graphs 1 and Fig. 3, first hydraulic fluid port 33 of pilot valve 30 is connected with the first hydraulic fluid port 22 of selector valve 20 by the 4th oil circuit 74, second hydraulic fluid port 34 of pilot valve 30 is connected with the second hydraulic fluid port 23 of selector valve 20 by the 5th oil circuit 75, and the 4th hydraulic fluid port 36 of pilot valve 30 is connected with the 6th hydraulic fluid port 27 of selector valve 20 by the 6th oil circuit 76.
In an example of the present invention, promote spool 31 to be provided with the first pilot valve annular undercut groove 391, second pilot valve annular undercut groove 392 and the 3rd pilot valve annular undercut groove 393 at pilot valve, each hydraulic fluid port that pilot valve 30 is arranged is communicated with by the oil circuit that the first pilot valve annular undercut groove 391, second pilot valve annular undercut groove 392 is corresponding to reversing mechanism 100 with the 3rd pilot valve annular undercut groove 393.Certain those skilled in the art can understand, the annular undercut groove on pilot valve 30 can be set to 1,3 or more as required.
In another example of the present invention, the 4th oil circuit 74 is provided with one-way valve 741, the feed liquor port of one-way valve 741 is communicated with the first hydraulic fluid port 33 of pilot valve, and the fluid port of one-way valve 741 is communicated with the first hydraulic fluid port 22 of selector valve 20.
In an also example of the present invention, reduce to make the control sensitivity of selector valve 20 and pilot valve 30, obtain better adjusting function, the shoulders 211 of the shoulders 311 and selector valve promotion spool 21 that therefore respectively pilot valve are promoted spool 31 is all set to conic section, can also avoid the hydraulic shock caused owing to closing reversing mechanism suddenly like this.
Below by describing the concrete structure further illustrating the reversing mechanism 100 for working machine tool for the working principle of the reversing mechanism 100 of working machine tool in detail.
Reversing mechanism 100 can be divided into three phases at commutation process: executive component retarding braking, short stay and reverse starting.It by valve core corresponding thereto change in location realize, different selector valves, its commutation ability is not quite similar.So-called stroke braking commutation refers to and starts to have commutated to commutation process, and the movement travel of executive component is constant.
Commutation loop in reversing mechanism 100 formed primarily of motor-driven pilot valve 30 and the working connection main reversing valve 20 that surges.Be characterized in that motor-driven pilot valve 30 not only works to control fluid, also participate in the control of worktable commutation braking process.Specifically as shown in Figure 1, when the worktable (not shown) of working machine tool moves right, buting iron 60 stirs driving lever 50, pilot valve 30 is moved to left, the braking conical surface T of its right-hand member turns down return opening gradually, the oil return resistance of oil hydraulic cylinder 10 is increased, produces braking action to oil hydraulic cylinder 10.When drainback passage is minimum, when the dynamic speed of worktable is extremely low, the surge oil circuit control of main reversing valve 20 of working connection starts to switch, and the main wealthy heart is moved to left, causes worktable stop motion and commutate.Obviously, from its commutation process, no matter the original movement velocity of worktable, move a certain distance always promote spool 31 at motor-driven pilot valve, namely movable workbench is a certain determine stroke after, the working connection main reversing valve 20 that surges just starts to commutate.
Stroke Control brake type refers to from sending commutation signal and brakes to workpiece, stop this process, and the stroke that workpiece is passed by is certain substantially.Its main feature be the oil return of oil hydraulic cylinder 10 after working connection surges main reversing valve 20, also need to flow back to fuel tank (not shown) via speed control muffler 351 again after motor-driven pilot valve 30.When working connection surges left end that main reversing valve 20 is in Fig. 1, the pressure oil of oil hydraulic pump 40 enters the right chamber of oil hydraulic cylinder 10 through one-way valve, therefore the piston 13 of oil hydraulic cylinder 10 is to left movement.When piston reaches left end terminal, the buting iron 60 be connected with piston 13 encounters driving lever 50, stirs motor-driven pilot valve 30 and moves right.At this moment main oil circuit is reduced gradually by the hydraulic fluid port of motor-driven pilot valve 30, and piston 13 is braked.When buting iron 60 makes motor-driven pilot valve 30 move right to hydraulic fluid port close to when closing by driving lever 50, lead to the surge control port of main reversing valve 20 left end of working connection to be opened, at this moment control oil to enter working connection through motor-driven pilot valve 30, one-way valve 741 and to surge the left chamber of main reversing valve 20, spool is moved to right.The extreme position of piston stroke is exactly the complete totally enclosed position of hydraulic fluid port when motor-driven pilot valve 30.At this moment piston 13 moves and stops completely.Therefore adopt in this way, no matter the speed of the original movement velocity of piston, always after the mobile roughly certain stroke of motor-driven pilot valve 1 oil hydraulic cylinder with regard to stop motion.Stroke Control brake type commutation loop of the present invention that Here it is.
Stroke braking commutation in the present invention can be divided into braking, end points stops and reverse starting three phases.Worktable braking can be divided into again pre-braking and whole braking two steps: the first step braking conical surface of motor-driven guide's valve core turns down oil hydraulic cylinder oil circuit, and worktable is slowed down, and realizes braking in advance; The second step main reversing valve that surges moves down into neutral position in the effect of pilot pressure oil, and now oil hydraulic cylinder two chamber logical pressure oil simultaneously, worktable stop motion, realizes braking eventually.Do like this and commutation process can be avoided to produce impact, commutation steadily.Move to the other end in neutral position to the main valve heart from the main valve heart, make this one-phase of worktable reverse starting be that worktable is in end points dwell phase.The length of the waiting time can by the throttle valve at main reversing valve two ends of surging or adjustment.The working connection most crucial and the most basic parts of main reversing valve 20 that surge are spool and valve pocket, and valve pocket has multiple annular undercut groove, these annular undercut grooves are communicated with outside oil circuit respectively.Spool there is a series of convex shoulder, when spool moves in valve pocket, open when covering undercut groove during shoulder, make between undercut groove, to form different break-make relations, reach the object of control break runner break-make relation.
Shown in composition graphs 1 to Fig. 3, particularly, when oil hydraulic pump 40 injects hydraulic pressure by the 3rd oil circuit 73 to selector valve 20, now selector valve promotion one end of spool 21 contacts with the first end 28 of selector valve 20, thus the second selector valve annular undercut groove 282 is communicated with the 4th hydraulic fluid port 25 with the 3rd hydraulic fluid port 24, make the 3rd hydraulic fluid port 24 and the 4th hydraulic fluid port 25 be open mode; Hydraulic pressure is by being in the 3rd hydraulic fluid port 24 of open mode and the 4th hydraulic fluid port 25 by hydraulic pressure transfer to the second oil circuit 72 in selector valve 20 afterwards; Then the second oil circuit 72 is passed through by hydraulic pressure transfer to the second hydraulic pressure cavity 12, realize piston 13 to move along the longitudinal direction of oil hydraulic cylinder 10 towards the first end 14 of oil hydraulic cylinder, and driven by buting iron 60 and driving lever 50 and promote valve rod 32 and move towards the second end 38 of pilot valve 30.
Simultaneously, hydraulic pressure in first hydraulic pressure cavity 11 is passed in selector valve 20 by the first oil circuit 71, now the first selector valve annular undercut groove 281 of selector valve 20 is communicated with the second hydraulic fluid port 23 with the 3rd hydraulic fluid port 24, make hydraulic pressure successively by being in the 3rd hydraulic fluid port 24 of the selector valve of open mode and the second hydraulic fluid port 23 and by hydraulic pressure transfer to the 5th oil circuit 75, the hydraulic pressure afterwards in the 5th oil circuit 75 is passed in pilot valve 30.
The first pilot valve annular undercut groove 391 now in pilot valve 30 is communicated with the 3rd hydraulic fluid port 35 with the second hydraulic fluid port 34, makes hydraulic pressure flow out reversing mechanism 100 by the second hydraulic fluid port 34 of pilot valve 30 and the 3rd hydraulic fluid port 35 successively.
Being driven by buting iron 60 and driving lever 50 at piston 13 promotes after valve rod 32 moves to the second end 38 of pilot valve, promoting valve rod 32 drives promotion spool 31 to move towards the second end 38 of pilot valve 30, the spool of pilot valve 30 is made to leave the first hydraulic fluid port 33 of pilot valve, to open the first hydraulic fluid port 33 of pilot valve; Pilot valve simultaneously between the first pilot valve annular undercut groove 391 and the second pilot valve annular undercut groove 392 promotes spool part and is closed by the 3rd hydraulic fluid port 35, from the flow of pressurized of the 3rd hydraulic fluid port 35 of pilot valve to the first hydraulic fluid port 33 of pilot valve, and flow to by the 4th oil circuit 74 in first hydraulic fluid port 22 of selector valve and move with second end 29 of the promotion spool 21 promoting selector valve towards selector valve.
When the promotion spool 21 of selector valve moves towards the second end 29 of selector valve and contacts with the second end 29 of selector valve, the selector valve between the first selector valve annular undercut groove 281 and the second selector valve annular undercut groove 282 promotes the part in spool 21 by channel enclosed between the 4th hydraulic fluid port 25 of selector valve and the 5th hydraulic fluid port 26.The hydraulic pressure coming from oil hydraulic pump 40 is like this flow in the 4th hydraulic fluid port 25 by the 3rd oil circuit 73, and flows in the first oil circuit 71 by the 4th hydraulic fluid port 25 and the 3rd hydraulic fluid port 24 successively; Flow in the first hydraulic pressure cavity 11 by the first oil circuit 71 afterwards, the second end 15 arranged along the longitudinal direction of oil hydraulic cylinder 10 towards the first end 14 relative to oil hydraulic cylinder to realize described piston 13 moves, piston 13 drives the promotion valve rod 32 of pilot valve to move towards the first end 37 of pilot valve by buting iron 60 and driving lever 50 simultaneously, and drive pilot valve promotion spool 31 to be communicated with the 4th hydraulic fluid port 36 of pilot valve by the 3rd pilot valve annular undercut groove 393, thus the 4th hydraulic fluid port 36 of pilot valve is made to be in open mode.
Meanwhile, the hydraulic pressure in the second oil hydraulic cylinder 12 flow in the 5th hydraulic fluid port 26 of selector valve by the second oil circuit 72, flow in the 6th oil circuit 76 afterwards by the 6th hydraulic fluid port 27 of selector valve, and the 3rd hydraulic fluid port 35 finally by pilot valve flows out described reversing mechanism 100.
In an example of the present invention, the object arranging one-way valve in reversing mechanism 100 is that the liquid stream limited in each oil circuit only passes through along a direction of pipeline and is oppositely cut off.In reversing mechanism 100, arrange acting as of throttle valve be provided with throttle valve on drive circuit, oil extraction flows back to fuel tank through throttle valve.By regulating the aperture of throttle valve, to change the flow of efflux cylinder pressure, thus the speed of oil hydraulic cylinder can be changed.
As can be seen here, this reversing mode of the present invention, can make oil hydraulic cylinder obtain very high commutation position precision, but because the braking distance of moving element is basically identical, so initial movement speed is larger, period of braking is shorter, and the comprehensive function of the two makes to impact and increases with speed and increase rapidly.Therefore to be mainly applicable to movement velocity not high for this mode, and the occasion that the required precision that commutates is higher, and be specially adapted to the needs of external cylindrical grinding machine processing multidiameter shaft etc.
The beneficial effect of technological scheme provided by the invention is: the reversing mechanism for working machine tool provided by the invention can make oil hydraulic cylinder obtain very high commutation position precision, and commutation is steadily reliable, sensitive in impacting.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1., for a reversing mechanism for working machine tool, it is characterized in that,
Described reversing mechanism comprises:
Oil hydraulic cylinder, is provided with piston in described oil hydraulic cylinder, and described oil hydraulic cylinder is separated into the first hydraulic pressure cavity and the second hydraulic pressure cavity that are arranged side by side each other by described piston;
Selector valve, described selector valve comprises selector valve in the inner chamber being arranged on described selector valve and promotes spool, and described selector valve respectively with described first hydraulic pressure cavity and described second hydraulic chamber into communication;
Pilot valve, described pilot valve comprises pilot valve in the inner chamber being arranged on described pilot valve to be promoted spool, promotes the promotion valve rod that spool is connected with described pilot valve, and described pilot valve and described selector valve communicate with each other;
Oil hydraulic pump, described oil hydraulic pump is communicated with described selector valve;
Driving lever, one end of described driving lever is connected with described promotion valve rod, the other end of described driving lever is arranged in the cavity of the centre of the buting iron on described working machine tool, and described buting iron is connected with described piston, and described piston drives described promotion valve rod to move by described buting iron and described driving lever;
In use, the movement of spool is promoted to realize the commutation of the piston in described oil hydraulic cylinder by described pilot valve promotion spool and described selector valve.
2. the reversing mechanism for working machine tool according to claim 1, is characterized in that,
Described selector valve comprises the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port, the 5th hydraulic fluid port and the 6th hydraulic fluid port, described first hydraulic fluid port is arranged on the first end of described selector valve, second hydraulic fluid port of described selector valve, the 3rd hydraulic fluid port, the 4th hydraulic fluid port, the 5th hydraulic fluid port and the 6th hydraulic fluid port all successively and come between the first end of described selector valve and the second end, and the first end of described selector valve and the second end positioned opposite to each other.
3. the reversing mechanism for working machine tool according to claim 2, is characterized in that,
Described first hydraulic pressure cavity is connected to each other by the 3rd hydraulic fluid port of the first oil circuit and described selector valve, described second hydraulic pressure cavity is connected to each other by the 5th hydraulic fluid port of the second oil circuit and described selector valve, 4th hydraulic fluid port of described selector valve is connected with described oil hydraulic pump by the 3rd oil circuit
Promote spool to be provided with selector valve annular undercut groove at described selector valve, each hydraulic fluid port that described selector valve is arranged is communicated with by the oil circuit that described selector valve annular undercut groove is corresponding to described reversing mechanism.
4. the reversing mechanism for working machine tool according to claim 3, is characterized in that,
Described pilot valve comprises the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port, described first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port are disposed side by side between the first end of described pilot valve and the second end successively along the longitudinal direction of described promotion valve rod, and the first end of described pilot valve and the second end positioned opposite to each other.
5. the reversing mechanism for working machine tool according to claim 4, is characterized in that,
First hydraulic fluid port of described pilot valve is connected with the first hydraulic fluid port of described selector valve by the 4th oil circuit, second hydraulic fluid port of described pilot valve is connected with the second hydraulic fluid port of described selector valve by the 5th oil circuit, and the 4th hydraulic fluid port of described pilot valve is connected with the 6th hydraulic fluid port of described selector valve by the 6th oil circuit.
6. the reversing mechanism for working machine tool according to claim 5, is characterized in that,
Promote spool to be provided with pilot valve annular undercut groove at described pilot valve, each hydraulic fluid port that described pilot valve is arranged is communicated with by the oil circuit that described pilot valve annular undercut groove is corresponding to described reversing mechanism,
3rd hydraulic fluid port of described pilot valve is the oil outlet of described reversing mechanism.
7. the reversing mechanism for working machine tool according to claim 6, is characterized in that,
When described oil hydraulic pump injects hydraulic pressure by the 3rd oil circuit to described selector valve, described hydraulic pressure is by being in the 3rd hydraulic fluid port of open mode and the 4th hydraulic fluid port by described hydraulic pressure transfer to described second oil circuit in described selector valve, pass through the second oil circuit afterwards by described hydraulic pressure transfer to described second hydraulic pressure cavity, realize piston to move along the longitudinal direction of described oil hydraulic cylinder towards the first end of described oil hydraulic cylinder, and drive described promotion valve rod to move towards the second end of described pilot valve by described buting iron and described driving lever;
Simultaneously, described hydraulic pressure in described first hydraulic pressure cavity is passed to the 3rd hydraulic fluid port opened of described selector valve by the first oil circuit, and successively by the 3rd hydraulic fluid port of described selector valve and the second hydraulic fluid port by described hydraulic pressure transfer to described 5th oil circuit, the hydraulic pressure afterwards in the 5th oil circuit flows out described reversing mechanism by the second hydraulic fluid port of pilot valve and the 3rd hydraulic fluid port successively.
8. the reversing mechanism for working machine tool according to claim 7, is characterized in that,
Described piston drives described promotion valve rod to after the second end of described pilot valve moves by described buting iron and described driving lever, described promotion valve rod drives described pilot valve promotion spool move to open the first hydraulic fluid port of described pilot valve towards the second end of described pilot valve and close the 3rd hydraulic fluid port, from the described flow of pressurized of the 3rd hydraulic fluid port of described pilot valve to the first hydraulic fluid port of described pilot valve, and flow to by the 4th oil circuit in the first hydraulic fluid port of described selector valve and promote spool move towards the second end of described selector valve to promote described selector valve.
9. the reversing mechanism for working machine tool according to claim 8, is characterized in that,
When described selector valve promote spool towards the second end of described selector valve move and the second end in contact with described selector valve time, described selector valve promotes spool and closes passage between the 4th hydraulic fluid port of described selector valve and the 5th hydraulic fluid port, the hydraulic pressure coming from described oil hydraulic pump flow in described 4th hydraulic fluid port by described 3rd oil circuit, and flow in described first oil circuit by the 4th hydraulic fluid port and the 3rd hydraulic fluid port successively, and flow in described first hydraulic pressure cavity by the first oil circuit, the second end arranged along the longitudinal direction of described oil hydraulic cylinder towards the first end relative to described oil hydraulic cylinder to realize described piston moves, described piston drives the promotion valve rod of described pilot valve to move towards the first end of described pilot valve by described buting iron and driving lever simultaneously, and drive described pilot valve promotion spool to open the 4th hydraulic fluid port of described pilot valve,
And the hydraulic pressure in described second oil hydraulic cylinder flow in the 5th hydraulic fluid port of described selector valve by described second oil circuit, flow in described 6th oil circuit by the 6th hydraulic fluid port of selector valve afterwards, the 3rd hydraulic fluid port finally by pilot valve flows out described reversing mechanism.
10. the reversing mechanism for working machine tool according to claim 9, is characterized in that,
Described 4th oil circuit is provided with one-way valve, and the feed liquor port of described one-way valve is communicated with the first hydraulic fluid port of described pilot valve, and the fluid port of described one-way valve is communicated with the first hydraulic fluid port of described selector valve;
3rd oil port of described pilot valve is provided with throttle valve;
The shoulders that described pilot valve promotes spool and selector valve promotion spool is all set to conic section.
CN201510587392.0A 2015-09-15 2015-09-15 Reversing system for machining tool Pending CN105201938A (en)

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Citations (8)

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Publication number Priority date Publication date Assignee Title
CN2116796U (en) * 1991-10-26 1992-09-23 云南第二机床厂 Hydraulic lohg-rang control device
CN102410167A (en) * 2011-11-17 2012-04-11 李镇明 Driving lever type reversing mechanism of hydraumatic grouting pump
JP2012141014A (en) * 2010-12-28 2012-07-26 Komatsu Ltd Hydraulic drive device
CN202883506U (en) * 2012-09-19 2013-04-17 姜成华 Pumping unit stable reversing hydraulic system
CN203272290U (en) * 2013-05-10 2013-11-06 浙江工商职业技术学院 Travel controlled braking type reversing loop
CN104481956A (en) * 2014-12-23 2015-04-01 李贵伦 Automatic reversing control system for double-acting cylinder based on travel control
CN104675807A (en) * 2015-03-12 2015-06-03 徐州重型机械有限公司 Hydraulic differential control system and method as well as crane
CN204476884U (en) * 2015-01-14 2015-07-15 依合斯电梯扶手(上海)有限公司 A kind of hydraulic system of polyurethane handrail joint moulding press

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2116796U (en) * 1991-10-26 1992-09-23 云南第二机床厂 Hydraulic lohg-rang control device
JP2012141014A (en) * 2010-12-28 2012-07-26 Komatsu Ltd Hydraulic drive device
CN102410167A (en) * 2011-11-17 2012-04-11 李镇明 Driving lever type reversing mechanism of hydraumatic grouting pump
CN202883506U (en) * 2012-09-19 2013-04-17 姜成华 Pumping unit stable reversing hydraulic system
CN203272290U (en) * 2013-05-10 2013-11-06 浙江工商职业技术学院 Travel controlled braking type reversing loop
CN104481956A (en) * 2014-12-23 2015-04-01 李贵伦 Automatic reversing control system for double-acting cylinder based on travel control
CN204476884U (en) * 2015-01-14 2015-07-15 依合斯电梯扶手(上海)有限公司 A kind of hydraulic system of polyurethane handrail joint moulding press
CN104675807A (en) * 2015-03-12 2015-06-03 徐州重型机械有限公司 Hydraulic differential control system and method as well as crane

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