CN212055322U - Hydraulic pilot control system and engineering machinery - Google Patents
Hydraulic pilot control system and engineering machinery Download PDFInfo
- Publication number
- CN212055322U CN212055322U CN202020433656.3U CN202020433656U CN212055322U CN 212055322 U CN212055322 U CN 212055322U CN 202020433656 U CN202020433656 U CN 202020433656U CN 212055322 U CN212055322 U CN 212055322U
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- port
- control valve
- pilot control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model relates to a hydraulic control technical field discloses a hydraulic pressure guide control system and engineering machine tool. The hydraulic pilot control system comprises a pilot control valve for controlling the action of a valve core of a main control valve, the main control valve is configured to control the action of an actuating mechanism of the engineering machinery, and the pilot control system also comprises a pilot control valveThe valve is replaced, and the switching valve is provided with an oil port A3Oil port P3Oil port T3Or oil port B3Oil port T3Can be selectively connected with the oil port A3Or oil port B3Middle communication, oil port P3Can be selectively connected with the oil port B3Or oil port A3Is communicated with the middle; oil port T of switching valve3An oil port A communicated with the pilot control valve2Oil port P of switching valve3An oil port B communicated with the pilot control valve2(ii) a Oil port A of switching valve3A first pilot control port S communicated with the main control valve1Oil port B of switching valve3A second pilot control port S communicated with the main control valve2. In the hydraulic pilot control system, the pilot control oil output from the same oil port of the pilot control valve can control the valve core of the main control valve to realize the switching in different directions by additionally arranging the switching valve.
Description
Technical Field
The utility model relates to a hydraulic control technical field especially relates to a hydraulic pressure guide control system and engineering machine tool.
Background
Engineering machines, e.g. bulldozers, excavators, with hydraulic pilot controlled by a handleThe pilot control valve 1' in the control system is actuated. Fig. 1 is a partial structural schematic diagram of a hydraulic pilot control system in a conventional construction machine, in which pilot control oil in the hydraulic pilot control system is delivered to a port P of a pilot control valve 1 ', and when a handle is operated by a manipulator, an oil port P of the pilot control valve 1' is communicated with an oil port a (or the oil port P is communicated with an oil port B). The pilot control oil reaches the first pilot control port S of the main control valve through the pilot control valve 11(or the second pilot control port S2) Finally, the valve core of the main control valve is pushed to act, and the reversing operation of the main control valve is completed.
In the above-described hydraulic pilot control system, the pilot control oil at the oil port a of the pilot control valve 1' can control only the first pilot control port of the main control valve, but cannot control the second pilot control port. The pilot control oil from the port B of the pilot control valve 1' can only control the second pilot control port of the main control valve, but cannot control the first pilot control port. Because of different operation habits of different manipulators, when the manipulator operates the handle and requires the handle to perform the same action, the valve core of the main control valve can be reversed differently, so that the actions of an executing mechanism (such as oil cylinder lifting of engineering machinery) controlled by the main control valve are different. That is, the pilot control oil of the port a (or the port B) of the pilot control valve 1' can control the first pilot control port S of the main control valve1(or second pilot control port S)2) It is also possible to change the control mode to the second pilot control port S for controlling the main control valve when necessary2(or the first pilot control port S1) The existing technical scheme can not meet the requirement, namely, the existing hydraulic pilot control system can not realize the operation switching of the forward and reverse hands.
In the above-described hydraulic pilot control system, the pilot control oil in the port a (or the port B) of the pilot control valve 1' directly acts on the first pilot control port S of the main control valve1(or second pilot control port S)2) The valve core of the main control valve is immediately reversed, so that the reversing of the main control valve is impacted and the reversing is not stable.
Furthermore, in cold working environments, the pilot control valve 1' is connected to the first pilot control port S of the main control valve1And pilot control valve 1' to the mainSecond pilot control port S of control valve2The viscosity of the hydraulic oil in the oil passage is increased, and operation delay and even failure may occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic pressure pilot control system, through addding the diverter valve among this hydraulic pressure pilot control system, the case that makes the pilot control oil of the same hydraulic fluid port output of pilot control valve can control the main control valve realizes the not switching of equidirectional.
Another object of the present invention is to provide an engineering machine, which utilizes the above hydraulic pilot control system, and can satisfy the requirement of the operation habit of the manipulator, and can perform the operation switching of the right hand and the reverse hand.
To achieve the purpose, the utility model adopts the following technical proposal:
the hydraulic pilot control system comprises a pilot control valve and a main control valve, wherein the pilot control valve is used for controlling the action of a valve core of the main control valve, the main control valve is configured to control the action of an executing mechanism of a construction machine, and the hydraulic pilot control system further comprises:
a switching valve provided with an oil port A3Oil port P3Oil port T3Or oil port B3Said oil port T3Can be selectively connected with the oil port A3Or the oil port B3In the middle, the oil port P3Can be selectively connected with the oil port B3Or the oil port A3Is communicated with the middle;
oil port T of the switching valve3An oil port A communicated with the pilot control valve2An oil port P of the switching valve3An oil port B communicated with the pilot control valve2；
Oil port A of the switching valve3A first pilot control port S communicated with the main control valve1And an oil port B of the switching valve3A second pilot control port S communicated with the main control valve2。
After a switching valve is arranged between the pilot control valve and the main control valve, the same oil port (oil port A) of the pilot control valve is enabled by switching a valve core of the switching valve2Or oil port B2) The outputted pilot control oil can enter the first pilot control port S of the main control valve1(second pilot control port S)2) Is converted into entering a second pilot control port S2(first pilot control port S)1) Thereby reversing the action of the actuator controlled by the master valve.
By arranging the switching valve, when the operation actions of the hand on the handle are the same, and the reversing of the valve core of the main control valve is opposite, namely the action of the executing mechanism is opposite, so that the hydraulic pilot control system can adapt to different operation habits of the hand, and the hand can carry out the operation switching of the forward hand and the reverse hand.
Preferably, the switching valve is a two-position four-way solenoid valve. The two-position four-way valve is adopted as a conventional structural member, so that the cost is low, and the required functions are easy to realize.
Preferably, the hydraulic pilot control system further includes:
a buffer control valve, an oil port A of the switching valve3A first control port A simultaneously communicated with the buffer control valve4And an oil port E of the buffer control valve, and a first pilot control port S of the main control valve1An oil port E communicated with the buffer control valve;
oil port B of the switching valve3A second control oil port B simultaneously communicated with the buffer control valve4And an oil port F of the cushion control valve, and a second pilot control port S of the main control valve2An oil port F communicated with the buffer control valve;
oil return port T of buffer control valve4An oil return port T connected to the oil tank and used for buffering the control valve4And can be selectively communicated with the oil port E or the oil port F of the buffer control valve.
The buffer control valve is arranged to act on the first pilot control port S of the main control valve1Or a second pilot control port S2The pilot control oil can not immediately push the valve core of the main control valve to change direction, so that the main control valve is protected from being impacted, and the change direction is stable.
Preferably, the hydraulic pilot control system further includes:
an oil inlet of the first check valve is communicated with a first control port A of the buffer control valve4The oil outlet of the first one-way valve is communicated with the oil port E of the buffer control valve;
an oil inlet of the second one-way valve is communicated with a second control oil port B of the buffer control valve4And the oil outlet of the second one-way valve is communicated with the oil port F of the buffer control valve.
The first check valve is provided to prevent the first pilot control port S of the main control valve from entering1The pilot control oil is returned to the first control port a of the cushion control valve4Resulting in insufficient power to reverse the spool of the main control valve. Similarly, the second check valve is provided to prevent the second pilot control port S of the main control valve from entering2The pilot control oil flows back to the second control oil port B of the buffer control valve4Resulting in insufficient power for the reversing action of the valve core of the main control valve.
Preferably, the hydraulic pilot control system further includes:
the first throttle valve is arranged between an oil inlet and an oil outlet of the first one-way valve in parallel;
and the second throttle valve is arranged between the oil inlet and the oil outlet of the second one-way valve in parallel.
The first throttle valve and the second throttle valve are arranged to prevent the valve core of the main control valve from being reset slowly when the hydraulic pilot control system stops working suddenly, so that the main control valve is not impacted greatly.
Preferably, the hydraulic pilot control system further includes:
and an oil inlet of the hot hydraulic oil component is communicated with an oil return oil way of the execution mechanism, and the hot hydraulic oil component is configured to supply hot hydraulic oil to an oil way between the pilot control valve and the main control valve.
The oil temperature in the oil return oil path of the executing mechanism connected with the main control valve is higher, the oil pipe is connected to the oil return oil path and is communicated with the hot hydraulic oil component, the hot hydraulic oil component supplies hot hydraulic oil to the oil path between the pilot control valve and the switching valve, the oil path between the switching valve and the buffer control valve and the oil path between the buffer control valve and the main control valve, the hot hydraulic oil flows back to the switching valve and the pilot control valve through the oil path, the oil temperature of the oil path between the pilot control valve and the main control valve is increased, in a cold working environment, the pilot control oil in the oil path cannot increase the viscosity due to the reduction of the external temperature, the normal work of the hydraulic pilot control system is ensured, and the phenomena of operation delay and even failure are avoided.
Preferably, the hot hydraulic oil assembly comprises:
the third one-way valve is arranged on an oil path between the first throttling valve and the oil inlet of the hot hydraulic oil component, and an oil outlet of the third one-way valve is communicated with the first throttling valve;
and the fourth one-way valve is arranged on an oil path between the second throttling valve and the oil inlet of the hot hydraulic oil component, and an oil outlet of the fourth one-way valve is communicated with the second throttling valve.
The third check valve and the fourth check valve are arranged to prevent pilot control oil and hot hydraulic oil in the hydraulic pilot control system from flowing back and flowing back to the oil tank through an oil return oil way of the actuating mechanism.
Preferably, the hot hydraulic oil assembly further includes:
and the preheating oil filter is arranged on an oil path between the oil inlet of the hot hydraulic oil component and the oil inlet of the third one-way valve.
Filtering main control valve oil return port P by preheating oil filter4And impurities of the hydraulic oil supplied to the oil passage of the cushion control valve.
Preferably, the hot hydraulic oil assembly further comprises a third throttle valve, and the third throttle valve is located between an oil outlet of the preheated oil filter and an oil inlet of the third one-way valve.
The flow of the hydraulic oil of the oil return oil path of the control execution mechanism is relatively large, and only a part of the hot hydraulic oil is needed in the hydraulic pilot control system, so that the third throttle valve is arranged to prevent the excessive hot hydraulic oil from entering the hydraulic pilot control system.
The utility model discloses in still provide an engineering machine tool, include hydraulic pressure pilot control system. By using the hydraulic pilot control system, the engineering machinery can meet the requirement of the operation habit of a manipulator and can switch the operation between the forward operation and the reverse operation.
The utility model has the advantages that: the utility model discloses in set up the diverter valve between pilot control valve and the master control valve after, through the case that switches the diverter valve, make same hydraulic fluid port (hydraulic fluid port A) of pilot control valve2Or oil port B2) The output pilot control oil can be introduced into the first pilot control port S of the main control valve1(second pilot control port S)2) Is converted into entering a second pilot control port S2(first pilot control port S)1) Thereby reversing the action of the actuator controlled by the master valve.
By arranging the switching valve, when the operation actions of the hand on the handle are the same, and the reversing of the valve core of the main control valve is opposite, namely the action of the executing mechanism is opposite, so that the hydraulic pilot control system can adapt to different operation habits of the hand, and the hand can carry out the operation switching of the forward hand and the reverse hand.
Drawings
FIG. 1 is a schematic diagram of a partial configuration of a prior art hydraulic pilot control system;
fig. 2 is a schematic structural diagram of the hydraulic pilot control system of the present invention;
FIG. 3 is a schematic diagram of the structure of the fuel supply assembly and the pilot control valve of the present invention;
fig. 4 is a schematic structural diagram of the pilot control valve and the switching valve of the present invention;
fig. 5 is a schematic diagram of a partial structure of the hydraulic pilot control system of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
The embodiment provides a hydraulic pilot control system which is applied to engineering machinery, wherein the engineering machinery can be a bulldozer, an excavator and the like.
In the engineering machinery, pilot control oil of a main control valve is controlled through a hydraulic pilot control system, so that the reversing action of a valve core of the main control valve is controlled. And the main control valve is connected with an actuating mechanism of the engineering machinery so as to supply oil to the actuating mechanism, thereby controlling the action of the actuating mechanism. For example, the main control valve is a three-position four-way valve, the actuator is an oil cylinder, a hydraulic pilot control system is used for controlling two pilot ends of the three-position four-way valve so as to control the reversing action of a valve core of the three-position four-way valve, and oil is supplied to the oil cylinder through a main oil circuit in the three-position four-way valve so as to control the lifting action of the oil cylinder.
Specifically, the hydraulic pilot control system includes an oil supply unit that supplies pilot control oil to the pilot control valve 1, and the pilot control valve 1.
Specifically, as shown in fig. 2 and 3, the oil supply unit includes a pilot pump 13 and a solenoid directional valve 14, and an output end of the pilot pump 13 is connected to an oil port P of the solenoid directional valve 141Oil port T of electromagnetic directional valve 141Is communicated with an oil tank and an oil port A1An oil port P communicated with the pilot control valve 12Oil port T of pilot control valve 12Is communicated with the oil tank. When the electromagnetic directional valve 14 does not work, the oil port A of the electromagnetic directional valve 141Oil mixing port T1And communicating to ensure that the pressure in the entire system is 0.
Preferably, the solenoid directional valve 14 is a two-position, three-way valve. The on/off of an oil path for feeding pilot control oil from the pilot pump 13 to the pilot control valve 1 is controlled by a two-position three-way valve.
When the electromagnetic directional valve works, the electromagnetic directional valve 14 is electrified, the valve core acts, and at the moment, the oil port P of the electromagnetic directional valve 141Oil mixing port A1The pilot control oil pumped by the pilot pump 13 passes through the oil port P of the electromagnetic directional valve 141Oil port A1Then enters the oil port P of the pilot control valve 12. After the handle is operated by the hand, the pilot control valve 1 is controlled to act, so that the oil port P of the pilot control valve 12Oil mixing port A2Communication or oil port P2Oil mixing port B2And (4) communicating.
Preferably, a first filter 15 is further connected in series between the pilot pump 13 and the electromagnetic directional valve 14 to filter the pilot control oil pumped from the oil tank by the pilot pump 13.
Preferably, a fifth check valve 16 is further connected in series between the first filter 15 and the electromagnetic directional valve 14, an oil inlet of the fifth check valve 16 is communicated with an oil outlet of the first filter 15, and an oil outlet of the fifth check valve 16 is communicated with an oil port P of the electromagnetic directional valve 141. The fifth check valve 16 is provided to prevent the pilot control oil in the oil passage from flowing back, causing a back flow shock to the first filter 15 and the pilot pump 13, and damaging the first filter 15 and the pilot pump 13.
Preferably, the oil port A of the electromagnetic directional valve 141And port P of pilot control valve 12With a second filter 17 being arranged therebetween. The second filter 17 is used for filtering the oil port P entering the pilot control valve 12The pilot control oil of (1).
Further, the first filter 15 and the second filter 17 perform two-stage filtration of the pilot control oil introduced into the pilot control valve 1, thereby improving the filtration accuracy of the pilot control oil and preventing the oil passage from being clogged.
Preferably, a pressure measuring port M is provided on an oil path between the fifth check valve 16 and the first filter 15. The pressure measuring port M is used for installing pressure measuring equipment so as to monitor the oil pressure of pilot control oil in an oil way in real time.
Preferably, the oil supply assembly further comprises a third filter 18 and a pressure regulating overflow valve 19, an oil inlet of the third filter 18 is communicated with an oil outlet of the pilot pump 13, an oil outlet of the third filter 18 is communicated with an oil inlet of the pressure regulating overflow valve 19 and a control port of the pressure regulating overflow valve 19, and an oil outlet of the pressure regulating overflow valve 19 is communicated with an oil tank.
The pressure regulating relief valve 19 controls the oil pressure in the oil passage between the pilot pump 13 and the electromagnetic directional valve 14, thereby preventing the oil pressure in the oil passage from becoming excessive. When the pressure in the oil path exceeds the set pressure value of the pressure-regulating overflow valve 19, the pilot control oil is filtered by the third filter 18 and overflows to the oil tank through the pressure-regulating overflow valve 19 so as to reduce the pressure in the oil path.
Preferably, as shown in fig. 4, the hydraulic pilot control system further includes a switching valve 2, and the switching valve 2 is provided with an oil port a3Oil port P3Oil port T3Or oil port B3Oil port T3Can be selectively connected with the oil port A3Or oil port B3Middle communication, oil port P3Can be selectively connected with the oil port B3Or oil port A3The middle communication, the oil port T of the switching valve 23An oil port A communicated with the pilot control valve 12Oil port P of switching valve 23An oil port B communicated with the pilot control valve 12. Oil port A of switching valve 23A first pilot control port S communicated with the main control valve1Oil port B of switching valve 23A second pilot control port S communicated with the main control valve2。
When the switching valve 2 is operated without reversingIn time, the oil port T of the switching valve 23Oil mixing port A3Communication, oil port P3Oil mixing port B3And (4) communicating. At this time, the hand operates the handle to control the operation of the pilot control valve 1, so that the port P of the pilot control valve 1 is opened2Oil mixing port A2And (4) communicating. The pilot control oil passes through an oil port P of the pilot control valve 12Oil port A2And port T of switching valve 23Oil port A3Then reaches the first pilot control port S of the main control valve1And further the valve core of the main control valve is pushed to act, and the main control valve completes the reversing.
Similarly, when the switching valve 2 is operated without reversing, the oil port T of the switching valve 23Still with the oil port A3Communication, oil port P3Still with the oil port B3And (4) communicating. At this time, the hand operates the handle to control the operation of the pilot control valve 1, so that the port P of the pilot control valve 1 is opened2Oil mixing port B2And (4) communicating. The pilot control oil passes through an oil port P of the pilot control valve 12Oil port B2And port P of switching valve 23Oil port B3Second pilot control S of the rear-reach main control valve2And further the valve core of the main control valve is pushed to act, and the main control valve completes the reversing.
When the selector valve 2 is operated to change the direction, the valve body of the selector valve 2 is actuated, and at this time, the port T of the selector valve 23Oil mixing port B3Are communicated with each other, the oil port P3Oil mixing port A3And (4) communicating. Then, the hand operates the handle to control the operation of the pilot control valve 1, so that the oil port P of the pilot control valve 12Oil mixing port A2And (4) communicating. The pilot control oil passes through an oil port P of the pilot control valve 12Oil port A2And port T of switching valve 23Oil port B3Then reaches a second pilot control port S of the main control valve2And further the valve core of the main control valve is pushed to act, and the main control valve completes the reversing.
Similarly, when the change-over operation of the change-over valve 2 is performed, the valve body of the change-over valve 2 is actuated, and at this time, the port T of the change-over valve 23Still with the oil port B3Are communicated with each other, the oil port P3Still with the oil port A3And (4) communicating. Then, the hand operates the handle to control the operation of the pilot control valve 1, so that the pilot control is performedOil port P of valve 12Oil mixing port B2Is communicated, and the pilot control oil passes through an oil port P of the pilot control valve 12Oil port B2And port P of switching valve 23Oil port A3Then reaches the first pilot control port S of the main control valve1And further the valve core of the main control valve is pushed to act, and the main control valve completes the reversing.
After the switching valve 2 is provided between the pilot control valve 1 and the main control valve, the same port (port a) of the pilot control valve 1 is made by switching the spool of the switching valve 22Or oil port B2) The output pilot control oil can be introduced into the first pilot control port S of the main control valve1(second pilot control port S)2) Is converted into entering a second pilot control port S2(first pilot control port S)1) Thereby reversing the action of the actuator controlled by the master valve.
By arranging the switching valve 2, when the operation actions of the hand on the handle are the same, but the reversing of the valve core of the main control valve is opposite, namely the action of the executing mechanism is opposite, so that the hydraulic pilot control system can adapt to different operation habits of the hand, and the hand can carry out the operation switching of the front hand and the back hand.
Preferably, the switching valve 2 is a two-position four-way solenoid valve. In the embodiment, the two-position four-way valve is adopted as a conventional structural member, so that the cost is low, and the required functions are easy to realize.
Further preferably, as shown in fig. 5, the hydraulic pilot control system further includes a cushion control valve 3, and the port a of the switching valve 23And is simultaneously communicated with a first control port A of the buffer control valve 34And an oil port E of the cushion control valve 3, a first pilot control port S of the main control valve1And an oil port E communicating with the cushion control valve 3. Oil port B of switching valve 23And is simultaneously communicated with a second control oil port B of the buffer control valve 34And a port F of the cushion control valve 3, a second pilot control port S of the main control valve2And an oil port F communicating with the cushion control valve 3. Oil return port T of buffer control valve 34Is connected to the oil tank. Oil return port T of buffer control valve 34An oil return port T connected with the oil tank and used for buffering the control valve 34Can be selectively communicated with the oil port E or the oil port F of the cushion control valve 3At the initial state, the oil return port T of the cushion control valve 34Is not communicated with the oil port E and the oil port F.
In this embodiment, the oil port a passes through the switching valve 23Through the first control port a of the cushion control valve 34The oil port E reaches a first pilot control port S of the main control valve1. Only when the main control valve and the second pilot control port S2The hydraulic oil in the second pilot oil cavity is communicated with the hydraulic oil cavity through the oil port F and the oil return port T of the buffer control valve 34After oil return, the valve core of the main control valve can be pushed to complete reversing action.
Since the cushion control valve 3 is in the initial state, the oil return port T of the cushion control valve 34And the oil port E and the oil port F are not communicated, so that the valve core of the main control valve cannot be immediately pushed to realize reversing. When the first control port A of the cushion control valve 34When the pilot control oil (3) overcomes the self spring force of the cushion control valve (3), the spool of the cushion control valve (3) operates, and the spool of the cushion control valve (3) gradually changes from the neutral position in fig. 5 to the 1 position. At this time, the port F and the return port T of the cushion control valve 34The hydraulic oil in the second pilot oil cavity of the main control valve passes through the oil port F and the oil return port T of the buffer control valve 34And returning oil, wherein the valve core of the main control valve is pushed to complete reversing. Due to the first control port A4The pilot control oil needs a certain time to overcome the self-set spring force of the cushion control valve 3, that is, the oil port F and the oil return port T of the cushion control valve 34Requires a certain time for the connection. In the process of overcoming the self spring force of the buffer control valve 3, the oil port F and the oil return port T of the valve core of the buffer control valve 34Gradually communicated to be completely communicated, so that the valve core of the main control valve gradually realizes reversing. Therefore, when the pilot control oil acts on the first pilot control port S1In addition, the valve core of the main control valve cannot be immediately reversed, so that the reversing action of the main control valve is buffered.
Similarly, when passing through the oil port B of the switching valve 23Through the second control port B of the cushion control valve 34The oil port F reaches a second pilot control port S of the main control valve2. Only when the main control valve is in first pilot controlPort S1The hydraulic oil in the first pilot oil cavity is communicated with the oil port E and the oil return port T of the buffer control valve 34After oil return, the valve core of the main control valve can be pushed to complete reversing action.
Since the cushion control valve 3 is in the initial state, the oil return port T of the cushion control valve 34And the oil port E and the oil port F are not communicated, and at the moment, the valve core of the main control valve cannot be pushed immediately. When the second control oil port B of the buffer control valve 34When the pilot control oil overcomes the self spring force of the cushion control valve 3, the spool of the cushion control valve 3 operates, and the spool of the cushion control valve 3 gradually changes from the neutral position to the 2-position. At this time, the oil port E and the oil return port T of the cushion control valve 34The hydraulic oil in the first pilot oil cavity of the main control valve passes through the oil port E and the oil return port T of the buffer control valve 34And returning oil, wherein the valve core of the main control valve is pushed to complete reversing. Due to the second control oil port B4The pilot control oil needs a certain time to overcome the self-set spring force of the cushion control valve 3, that is, the oil port E and the oil return port T of the cushion control valve 34Requires a certain time for the connection. In the process of overcoming the self spring force of the buffer control valve 3, the oil port E and the oil return port T of the valve core of the buffer control valve 34Gradually communicated to be completely communicated, so that the valve core of the main control valve gradually realizes reversing. Therefore, the pilot control oil acts on the second pilot control port S2In addition, the valve core of the main control valve cannot be immediately reversed, so that the reversing action of the main control valve is buffered.
The cushion control valve 3 is provided so as to act on the first pilot control port S of the main control valve1Or a second pilot control port S2The pilot control oil can not immediately push the valve core of the main control valve to change direction, so that the main control valve is protected from being impacted, and the change direction is stable.
Further preferably, the hydraulic pilot control system further comprises a first check valve 4 and a second check valve 5, wherein an oil inlet of the first check valve 4 is communicated with the first control port a of the cushion control valve 34And an oil outlet of the first one-way valve 4 is communicated with an oil port E of the buffer control valve 3. An oil inlet of the second one-way valve 5 is communicated with a second control oil port B of the buffer control valve 34Second, secondThe oil outlet of the one-way valve 5 is communicated with the oil port F of the buffer control valve 3.
The first check valve 4 is provided to prevent the first pilot control port S of the main control valve from entering1The pilot control oil of (a) flows back to the first control port a of the damping control valve 34Resulting in insufficient power to reverse the spool of the main control valve. Similarly, the second check valve 5 is provided to prevent the second pilot control port S of the main control valve from entering2The pilot control oil flows back to the second control port B of the cushion control valve 34Resulting in insufficient power for the reversing action of the valve core of the main control valve.
Further preferably, the hydraulic pilot control system further comprises a first throttle valve 6 and a second throttle valve 7, wherein the first throttle valve 6 is arranged in parallel between the oil inlet and the oil outlet of the first check valve 4. The second throttle valve 7 is arranged between the oil inlet and the oil outlet of the second one-way valve 5 in parallel.
When the engineering machinery is suddenly stopped, the buffering reversing valve is not operated, the handle is positioned at the middle position at the moment, and the oil port A of the pilot control valve 1 is positioned at the middle position at the moment2Oil port B2All are connected with the oil port T1An oil return port T of the communicated buffer control valve 34Is not communicated with the oil port E and the oil port F, and buffers the first control port A of the control valve 34And a second control port B4To the pressure of the tank.
If the spool of the switching valve 2 is in the state shown in fig. 4 and hydraulic oil still exists in the first pilot oil chamber of the main control valve, the main control valve pushes the spool of the main control valve to reset under the action of its own spring, and the hydraulic oil in the first pilot oil chamber passes through the first throttle valve 6 and the first control port a of the buffer control valve 34And oil port A of reversing valve3Oil port T3And port a of pilot control valve 12Oil port T1And slowly flows back to the oil tank.
Similarly, if hydraulic oil exists in the second pilot oil cavity of the main control valve, the main control valve pushes the valve core of the main control valve to reset under the action of the spring of the main control valve, and the hydraulic pressure in the second pilot oil cavity passes through the second throttling valve 7 and the second control oil port B of the buffer control valve 34And a reversing valve oil port B3Oil portP3And a port B of the pilot control valve 12Oil port T1And slowly flows back to the oil tank.
The first throttle 6 and the second throttle 7 are provided to allow the spool of the main control valve to be slowly reset when the hydraulic pilot control system suddenly stops operating, so that the main control valve is not subjected to a large impact.
The hydraulic pilot control system further comprises a hot hydraulic oil component, an oil inlet of the hot hydraulic oil component is communicated with an oil return oil path of the execution mechanism, and the hot hydraulic oil component is configured to supply hot hydraulic oil to an oil path between the pilot control valve 1 and the main control valve, specifically, an oil path between the pilot control valve 1 and the switching valve 2, an oil path between the switching valve 2 and the buffer control valve 3, and an oil path between the buffer control valve 3 and the main control valve.
In this embodiment, the oil temperature in the oil return path of the actuator connected to the main control valve is higher, an oil pipe is connected to the oil return path, the oil pipe is connected to the hot hydraulic oil assembly, the hot hydraulic oil assembly supplies hot hydraulic oil to the oil path between the pilot control valve 1 and the switching valve 2, the oil path between the switching valve 2 and the buffer control valve 3, and the oil path between the buffer control valve 3 and the main control valve, and the hot hydraulic oil flows back to the switching valve 2 and the pilot control valve 1 through the oil path, so that the oil temperature of the oil path between the pilot control valve 1 and the main control valve is increased, and in a cold working environment, the pilot control oil in the oil path does not increase viscosity due to a decrease in external temperature, thereby ensuring that the hydraulic pilot control system can work normally, and avoiding operation delay or even failure.
Specifically, in this embodiment, the oil inlet of the hot hydraulic oil assembly is the oil return port P of the main control valve4。
Specifically, the hot hydraulic oil assembly comprises a third check valve 9 and a fourth check valve 10, wherein the third check valve 9 is arranged on an oil path between the first throttle valve 6 and an oil inlet of the hot hydraulic oil assembly, and an oil outlet of the third check valve 9 is communicated with the first throttle valve 6. The fourth check valve 10 is arranged on an oil path between the second throttle valve 7 and an oil inlet of the hot hydraulic oil component, and an oil outlet of the fourth check valve 10 is communicated with the second throttle valve 7.
The third check valve 9 and the fourth check valve 10 are arranged to prevent pilot control oil and hot hydraulic oil in the hydraulic pilot control system from flowing back and flowing back to an oil tank through an oil return oil way of the actuating mechanism.
When the spool of the switching valve 2 is in the position shown in fig. 4, the oil return port P of the main control valve4The temperature of the hot hydraulic oil, namely the return oil of the hydraulic oil of the actuating mechanism is higher before entering the radiator, and the pilot control oil in the hydraulic pilot control system is heated by the part of the hydraulic oil. The hot hydraulic oil partially passes through the third check valve 9 and the first throttle valve 6 and then reaches the first control port A of the cushion control valve 34And transferred to the oil port A of the switching valve 23Oil port T3And a port A of the pilot control valve 12Oil port T1Meanwhile, part of the hot hydraulic oil is transferred to a first pilot control port S of the main control valve through an oil port E of the buffer control valve 31。
In addition, after passing through the fourth check valve 10 and the second throttle valve 7, part of the hot hydraulic oil reaches the second control oil port B of the cushion control valve 34And transferred to the oil port B of the switching valve 23Oil port P3And a port B of the pilot control valve 12Oil port T1Meanwhile, a second pilot control port S of the main control valve is transmitted through an oil port F of a part of the hot hydraulic oil buffer control valve 32。
Further preferably, the hydraulic pilot control system further comprises a preheated oil filter 11, and the preheated oil filter 11 is arranged at an oil return port P of the main control valve4And the oil inlet of the third one-way valve 9. Filtering the oil return port P of the main control valve by the preheating oil filter 114Impurities of the hydraulic oil supplied to the oil passage of the damping control valve 3.
Further preferably, the hot hydraulic oil assembly further comprises a third throttle valve 12, the third throttle valve 12 being located between the oil outlet of the preheated oil filter 11 and the third one-way valve 9. The flow rate of the hydraulic oil of the oil return oil path of the control execution mechanism is relatively large, and only a part of the hot hydraulic oil is needed in the hydraulic pilot control system, so that the third throttle valve 12 is arranged to prevent the excessive hot hydraulic oil from entering the hydraulic pilot control system.
In other embodiments, the hot hydraulic oil assembly may further include two parallel first branches disposed on an oil path between the pilot control valve 1 and the switching valve 2, and one end of each of the two first branches is communicated with the oil return port P of the main control valve4The other end of one of the first branches is communicated with an oil port T of the switching valve3The other end of the other first branch is communicated with an oil port P of the switching valve3(ii) a And/or an oil path between the switching valve 2 and the buffer control valve 3 is provided with two parallel second branches, and one ends of the two second branches are communicated with an oil return port P of the main control valve4The other end of one of the second branches is communicated with the oil port A of the switching valve3The other end of the other second branch is communicated with an oil port B of the switching valve3(ii) a Two third branches are arranged on the oil path between the switching valve 2 and the main control valve in parallel, and one end of each third branch is communicated with an oil return port P of the main control valve4The other end of one third branch is communicated with a first control port A of the buffer control valve4The other end of the other first branch is communicated with a first control port B of the buffer control valve4。
Preferably, check valves are disposed on the first branch, the second branch and the third branch to prevent pilot control oil in the hydraulic pilot control system and hot hydraulic oil entering the hydraulic pilot control system from flowing back to an oil return line of the implement system.
Preferably, when the first branch, the second branch and the third branch are provided at the same time, the three branches are communicated with the oil return port P of the main control valve through a main branch4The main branch is provided with a filter and a throttle valve to filter the hot hydraulic oil entering the three branches, and simultaneously, the filtered hot hydraulic oil is limited in flow to prevent the excessive hot hydraulic oil from entering the three branches.
The embodiment also provides engineering machinery comprising the hydraulic pilot control system. The engineering machinery adopts the hydraulic pilot control system, can meet the operating habit requirements of different manipulators, and can carry out forward and backward operation switching.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A hydraulic pilot control system comprises a pilot control valve (1) for controlling the action of a valve core of a main control valve, wherein the main control valve is configured to control the action of an executing mechanism of a construction machine, and is characterized by further comprising:
a switching valve (2), the switching valve (2) is provided with an oil port A3Oil port P3Oil port T3Or oil port B3Said oil port T3Can be selectively connected with the oil port A3Or the oil port B3In the middle, the oil port P3Can be selectively connected with the oil port B3Or the oil port A3Is communicated with the middle;
an oil port T of the switching valve (2)3An oil port A communicated with the pilot control valve (1)2An oil port P of the switching valve (2)3An oil port B communicated with the pilot control valve (1)2；
An oil port A of the switching valve (2)3A first pilot control port S communicated with the main control valve1An oil port B of the switching valve (2)3A second pilot control port S communicated with the main control valve2。
2. The hydraulic pilot control system according to claim 1, characterized in that the switching valve (2) is a two-position four-way solenoid valve.
3. The hydraulic pilot control system according to claim 1 or 2, characterized in that the hydraulic pilot control system further comprises:
a buffer control valve (3), an oil port A of the switching valve (2)3A first control port A simultaneously communicated with the buffer control valve (3)4And an oil port E of the buffer control valve (3), and a first pilot control port S of the main control valve1An oil port E communicated with the buffer control valve (3);
an oil port B of the switching valve (2)3A second control oil port B simultaneously communicated with the buffer control valve (3)4And an oil port F of the buffer control valve (3), and a second pilot control port S of the main control valve2An oil port F communicated with the buffer control valve (3);
an oil return port T of the buffer control valve (3)4Is connected to an oil tank, and an oil return port T of the buffer control valve (3)4Can be selectively communicated with the oil port E or the oil port F of the buffer control valve (3).
4. The hydraulic pilot control system of claim 3, further comprising:
the oil inlet of the first check valve (4) is communicated with a first control port A of the buffer control valve (3)4An oil outlet of the first one-way valve (4) is communicated with an oil port E of the buffer control valve (3);
the oil inlet of the second check valve (5) is communicated with a second control oil port B of the buffer control valve (3)4And an oil outlet of the second one-way valve (5) is communicated with an oil port F of the buffer control valve (3).
5. The hydraulic pilot control system of claim 4, further comprising:
the first throttling valve (6) is arranged between an oil inlet and an oil outlet of the first one-way valve (4) in parallel;
and the second throttle valve (7) is arranged between the oil inlet and the oil outlet of the second one-way valve (5) in parallel.
6. The hydraulic pilot control system of claim 5, further comprising:
the oil inlet of the hot hydraulic oil component is communicated with an oil return oil way of the execution mechanism, and the hot hydraulic oil component is configured to supply hot hydraulic oil to an oil way between the pilot control valve (1) and the main control valve.
7. The hydraulic pilot control system of claim 6, wherein the hot hydraulic oil assembly comprises:
the third one-way valve (9) is arranged on an oil path between the first throttling valve (6) and an oil inlet of the hot hydraulic oil component, and an oil outlet of the third one-way valve (9) is communicated with the first throttling valve (6);
and the fourth one-way valve (10) is arranged on an oil path between the second throttling valve (7) and the oil inlet of the hot hydraulic oil component, and the oil outlet of the fourth one-way valve (10) is communicated with the second throttling valve (7).
8. The hydraulic pilot control system of claim 7, wherein the hot hydraulic oil assembly further comprises:
the preheating oil filter (11), the preheating oil filter (11) is arranged on an oil path between an oil inlet of the hot hydraulic oil component and an oil inlet of the third one-way valve (9).
9. The hydraulic pilot control system according to claim 8, characterized in that the hot hydraulic oil assembly further comprises a third throttle valve (12), the third throttle valve (12) being located between an oil outlet of the preheated oil filter (11) and an oil inlet of the third check valve (9).
10. A working machine comprising a hydraulic pilot control system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020433656.3U CN212055322U (en) | 2020-03-30 | 2020-03-30 | Hydraulic pilot control system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020433656.3U CN212055322U (en) | 2020-03-30 | 2020-03-30 | Hydraulic pilot control system and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212055322U true CN212055322U (en) | 2020-12-01 |
Family
ID=73540393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020433656.3U Active CN212055322U (en) | 2020-03-30 | 2020-03-30 | Hydraulic pilot control system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212055322U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114207295A (en) * | 2021-11-15 | 2022-03-18 | 无锡市东舟船舶设备股份有限公司 | Hydraulic system |
-
2020
- 2020-03-30 CN CN202020433656.3U patent/CN212055322U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114207295A (en) * | 2021-11-15 | 2022-03-18 | 无锡市东舟船舶设备股份有限公司 | Hydraulic system |
| WO2023082234A1 (en) * | 2021-11-15 | 2023-05-19 | 无锡市东舟船舶设备股份有限公司 | Hydraulic system |
| CN114207295B (en) * | 2021-11-15 | 2024-04-05 | 无锡市东舟船舶设备股份有限公司 | Hydraulic system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107208675B (en) | The hydraulic oil energy regenerating device of Work machine | |
| CN100549431C (en) | Fluid pressure valve device | |
| CN101230869A (en) | Hydraulic control device of construction machine | |
| CN103620233B (en) | For the hydraulic control valve of construction plant | |
| JP2000046002A (en) | Float circuit | |
| CN107250563B (en) | Flow control valve for construction machine | |
| CN102889259B (en) | Multipath valve and engineering machinery | |
| CN212055322U (en) | Hydraulic pilot control system and engineering machinery | |
| US6453585B1 (en) | Hydraulic drive device of working machine | |
| CN105986595A (en) | Machine and hydraulic system for machine | |
| EP2686493B1 (en) | Cushioned swing circuit | |
| US20220275605A1 (en) | Hydraulic control system | |
| CN103148036B (en) | Hydrovalve | |
| EP2933504B1 (en) | Hydraulic circuit for construction machines | |
| CN214940594U (en) | Multiple control system for excavator walking | |
| JPH08105078A (en) | Variable priority device | |
| CN210829934U (en) | Hydraulic combination valve | |
| CN112032122B (en) | Hydraulic control system and excavator with same | |
| CN104179739A (en) | Dual-pump bidirectional confluence control system and fire truck adopting same | |
| EP3821136B1 (en) | Hydraulic machine comprising a hydraulic circuit | |
| CN110985461B (en) | Hydraulic motor control system | |
| WO2007116035A1 (en) | Pilot-operated differential-area pressure compensator and control system for piloting same | |
| CN104564873B (en) | Single load hydraulic system and machine | |
| JP6577431B2 (en) | Hydraulic drive unit for construction machinery | |
| CN108167237B (en) | Hydraulic control system for construction machine and excavator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |