CN211692993U - Walking hydraulic pilot control system - Google Patents
Walking hydraulic pilot control system Download PDFInfo
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- CN211692993U CN211692993U CN201922476212.8U CN201922476212U CN211692993U CN 211692993 U CN211692993 U CN 211692993U CN 201922476212 U CN201922476212 U CN 201922476212U CN 211692993 U CN211692993 U CN 211692993U
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Abstract
The utility model relates to the technical field of hydraulic control, in particular to a walking hydraulic pilot control system, which comprises a pilot oil path, a main oil path, a walking pilot valve and an actuating mechanism, wherein the pilot oil path is used for outputting pressure oil by the actuating mechanism; the main oil way is respectively connected with the corresponding actuating mechanisms; the walking pilot valve is connected with the control oil way and controls a plurality of conduction states through a pilot valve handle; the actuating mechanism comprises a shift valve, a speed change valve and a steering brake valve, and the pilot valve handle is electrically connected with the shift valve through an electromagnetic valve; the walking pilot valve is connected with the variable speed valve through a plurality of control oil ways; and the walking pilot valve is connected with the steering brake valve through a plurality of control oil ways. The utility model discloses can realize the simple control of singlehanded, reduce driver work fatigue strength, it is nimble convenient to control, and the reliability is high, the walking is steady and the cost is lower.
Description
Technical Field
The utility model relates to a hydraulic control technical field, in particular to walking hydraulic pressure pilot control system.
Background
The walking control of the bulldozer in the industry mainly realizes the reversing and shifting functions of a transmission system gearbox through a mechanical connecting rod or an electric element control hydraulic valve, realizes the steering and braking functions of central transmission, has high requirements on the processing precision and the durability of parts through the operation of the mechanical connecting rod, has large operation force and poor comfort, influences the operation effect after the parts are abraded, causes larger impact force due to unstable walking, and greatly reduces the service life of each clutch; the electrical control is convenient to operate and install, but the production and maintenance costs are high.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problems that the mechanical connecting rod control in the related technology has high requirements on the processing precision and the durability of parts, large operating force and poor comfort, the operating effect is influenced after the parts are worn, and the walking is not stable to cause larger impact force, so that the service life of each clutch is greatly reduced; the electric control operation and installation is convenient, but the production and maintenance cost is high, the walking hydraulic pilot control system is provided, the single-hand simple control can be realized, the working fatigue strength of a driver is reduced, the operation is flexible and convenient, the reliability is high, the walking is stable, and the cost is low.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme: a walking hydraulic pilot control system comprising:
the pilot oil way is provided with a plurality of oil ports and is used for outputting pressure oil by the actuating mechanism;
the main oil way is provided with a plurality of oil ports and is respectively connected with corresponding actuating mechanisms;
the walking pilot valve is connected with the control oil way and controls a plurality of conduction states through a pilot valve handle;
an actuator, comprising:
the shifting valve is communicated with a speed changing valve oil port on the gearbox through an a port and a b port respectively, the shifting valve is connected with the priority valve through a P port, the shifting valve is connected with the rear axle box through a T port, and the walking pilot valve is electrically connected with the shifting valve through an electromagnetic valve;
the speed change valve comprises a reversing valve core, a speed change valve core and a plurality of oil ports, the oil ports on the pilot oil path push the reversing valve core through output pressure oil, the speed change valve core moves to control the on-off of each oil port in the speed change valve to realize reversing and gear shifting, and the walking pilot valve is connected with the speed change valve through a plurality of control oil paths;
the steering brake valve is respectively connected with the left steering clutch and the right steering clutch through the oil inlet cavity P and respectively supplies oil to the left steering clutch and the right steering clutch so as to realize left-side or right-side steering; and the walking pilot valve is connected with the steering brake valve through a plurality of control oil ways.
Preferably, the gear shifting valve comprises a gear shifting valve I and a gear shifting valve II, and the gear shifting valve I and the gear shifting valve II are respectively and electrically connected with an upshift button and a downshift button on a pilot valve handle through electromagnetic valves; the first working port A1 of the shift valve I is connected with a speed changing valve oil port on the gearbox through a port, the second working port A2 of the shift valve I1 is connected with a T port through an oil way, the third working port A3 of the shift valve I is connected with the second working port B2 of the shift valve II through an oil way, the first working port B1 of the shift valve II is connected with a speed changing valve oil port on the gearbox through a B port, the third working port B3 of the shift valve II is connected with a P port, and the fourth working port B4 of the shift valve II is connected with the T port.
Preferably, the speed change valve further comprises a valve core I, the valve core I and the reversing valve core are abutted against each other, and a spring I is arranged between the valve core I and the inner wall of the valve body; the speed change valve core comprises a speed change valve core I and a speed change valve core II, and a spring II is arranged between the speed change valve core I and the speed change valve core II.
As a preferred scheme, an oil port F and an oil port R are respectively arranged on a pilot oil path of the reversing valve core, and an oil inlet FR, an execution oil port Fc and an execution oil port Rc are arranged on a main oil path of the reversing valve core; an oil port A and an oil port B are respectively arranged on a pilot oil path of the variable speed valve core, and an oil inlet PC, an execution oil port 1C, an execution oil port 2C and an execution oil port 3C are arranged on a main oil path of the variable speed valve core.
As a preferred scheme, an oil inlet F on the pilot oil way controls the reversing valve core to move right, and the oil inlet FR is communicated with an execution oil port Fc to realize the advancing function; and an oil inlet R on the pilot oil way controls the reversing valve core to move leftwards, and the oil inlet FR is communicated with an execution oil port Rc to realize the retreating function.
As a preferred scheme, oil enters an oil port A on the pilot oil way to control the shift valve core to move rightwards, and an oil inlet PC is communicated with an execution oil port 1C to realize a 1-gear function; an oil inlet B on the pilot oil way controls the left shift of the speed change valve core, and the oil inlet PC is communicated with an execution oil port 2C to realize the 2-gear function; and when the oil port A and the oil port B on the pilot oil way are both free of control oil, the oil inlet PC is communicated with the execution oil port 3C, so that a 3-gear function is realized.
According to a preferable scheme, the steering brake valve comprises a valve body, a left steering brake cavity, a right steering brake cavity, an oil inlet cavity P and an oil return cavity T are formed in the valve body, a valve core II and a valve core III are respectively arranged in the left steering brake cavity and the right steering brake cavity, and a spring III and a spring IV are respectively arranged at one end of the valve core II and one end of the valve core III; a left steering clutch oil inlet CL is arranged on one side of the left steering brake cavity, and a pilot oil supply port PCL is arranged on the other side of the left steering brake cavity; a right steering clutch oil inlet CR is arranged at one side of the right steering brake cavity, and a pilot oil supply port PCR is arranged at the other side of the right steering brake cavity; the left steering brake cavity and the right steering brake cavity are communicated with the oil inlet cavity P, and the left steering brake cavity and the right steering brake cavity are communicated with the oil return cavity T; the left steering clutch and the right steering clutch are respectively connected with the left steering brake and the right steering brake.
Preferably, when the oil inlet cavity P, the pilot oil supply port PCL and the pilot oil supply port PCR are filled with oil, the valve core II or the valve core III moves to the side far away from the spring III or the spring IV, the oil inlet cavity P is communicated with the oil inlet CL of the left steering clutch or the oil inlet CR of the right steering clutch, and oil is supplied to the left steering clutch or the right steering clutch.
Preferably, when the oil inlet cavity P and the pilot oil supply port PCR are filled with oil and the pilot oil of the pilot oil supply port PCL is cut off, the valve core II moves to the side close to the spring III, the oil inlet CL of the left steering clutch is communicated with the oil return cavity T to release pressure, the left steering clutch cuts off the oil supply, and the right steering clutch normally supplies the oil to realize left steering.
As a preferable scheme, when the oil inlet cavity P and the pilot oil supply port PCL are filled with oil and the pilot oil of the pilot oil supply port PCR is cut off, the valve core iii moves to a side close to the directional spring iv, the oil inlet CR of the right steering clutch is communicated with the oil return cavity T to release pressure, the right steering clutch cuts off the oil supply, and the left steering clutch normally supplies the oil to realize the right steering.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) according to the invention, hydraulic oil is used as a medium to transmit a control signal through a walking pilot valve, an upshift button and a downshift button on a pilot valve handle of the walking pilot valve are connected with a gear shifting valve through an electromagnetic valve, the walking pilot valve outputs pilot oil to change an oil path of the gear shifting valve, the meshing sequence of a speed gear in a gearbox is controlled, the pilot valve is operated front and back to change the oil path of the gear shifting valve, the meshing sequence of front and back direction gear gears in the gearbox is controlled, the pilot valve is operated left and right to change an oil path of a steering brake valve, the combination of a clutch and a steering brake is controlled, a power transmission circuit is changed, smooth steering and unilateral braking steering are realized, the walking control of a bulldozer is completely integrated in the walking pilot valve on the left side, the simple control by one hand;
(2) the walking pilot valve is matched with the speed change valve and the steering brake valve, so that the walking stability and the small impact of the bulldozer are ensured, and the service life of each clutch is prolonged;
(3) compared with an electrically controlled walking system, the hydraulic pilot system of the utility model has lower cost and is suitable for the production cost requirement of the bulldozer in the current market;
(4) all hydraulic elements can be flexibly arranged, the installation of internal parts of the bulldozer is improved, the adjustment time of the control mechanism is reduced, and the assembly efficiency and the qualification rate are improved.
Drawings
FIG. 1 is a control logic diagram of the present invention;
fig. 2 is a schematic structural diagram of a pilot valve handle of the present invention;
fig. 3 is a schematic diagram of a shift valve of the present invention;
FIG. 4 is a schematic view of the internal structure of the transmission valve of the present invention;
fig. 5 is a schematic view of the internal structure of the steering brake valve of the present invention.
In the figure:
1. the automatic control device comprises shift valves I and 2, shift valves II and 3, reversing valve cores 4, speed change valve cores 401, speed change valve cores I and 402, speed change valve cores II and 5, valve cores I and 6, springs I and 7, springs II and 8, valve cores II and 9, valve cores III and 10, springs III and 11, springs IV and 12, a valve body and 13 and a pilot valve handle.
Detailed Description
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.
As shown in fig. 1 to 5, a traveling hydraulic pilot control system includes:
the pilot oil way is provided with a plurality of oil ports and is used for outputting pressure oil by the actuating mechanism;
the main oil way is provided with a plurality of oil ports and is respectively connected with the corresponding actuating mechanisms;
the walking pilot valve is connected with the control oil way and controls a plurality of conduction states through a pilot valve handle 13;
an actuator, comprising:
the shifting valve is communicated with a shifting valve oil port on the gearbox through an a port and a b port respectively, the shifting valve is connected with the priority valve through a P port, the shifting valve is connected with the rear axle box through a T port, and the walking pilot valve is electrically connected with the shifting valve through an electromagnetic valve;
the speed change valve comprises a reversing valve core 3, a speed change valve core 4 and a plurality of oil ports, the oil ports on the pilot oil path push the reversing valve core 3 and the speed change valve core 4 to move to control the on-off of each oil port in the speed change valve through output pressure oil so as to realize reversing and gear shifting, and the walking pilot valve is connected with the speed change valve through a plurality of control oil paths;
the steering brake valve is respectively connected with the left steering clutch and the right steering clutch through the oil inlet cavity P and respectively supplies oil to the left steering clutch and the right steering clutch so as to realize left-side or right-side steering; the walking pilot valve is connected with the steering brake valve through a plurality of control oil ways.
As shown in fig. 2, when the pilot valve handle 13 is in the neutral position, each oil path in the walking pilot valve is disconnected, and no pressure oil is output; when the pilot valve handle 13 is in the front or rear position, the speed change valve is respectively controlled to realize the functions of backward movement and forward movement; the gear-shifting button and the gear-shifting button on the pilot valve handle 13 control the gear-shifting valve to output pilot pressure oil to control the speed-changing valve to realize the gear-shifting and speed-changing functions; when the pilot valve handle 13 is in the left or right position, the steering brake valve is respectively controlled to realize the left and right steering functions.
In one embodiment, the shift valve comprises a shift valve I1 and a shift valve II 2, and the shift valve I1 and the shift valve II 2 are respectively and electrically connected with an upshift button and a downshift button on the pilot valve handle 13 through electromagnetic valves; the first working port A1 of the shift valve I1 is connected with a speed change valve oil port on the gearbox through an a port, the second working port A2 of the shift valve I1 is connected with a T port through an oil way, the third working port A3 of the shift valve I1 is connected with the second working port B2 of the shift valve II 2 through an oil way, the first working port B1 of the shift valve II 2 is connected with a speed change valve oil port on the gearbox through a B port, the third working port B3 of the shift valve II 2 is connected with a P port, and the fourth working port B4 of the shift valve II 2 is connected with the T port.
When the hydraulic transmission device works specifically, a shift-up button or a shift-down button on the pilot handle 13 is pressed, electromagnets on one side of a shift valve I1 or one side of a shift valve II 2 are respectively controlled, so that the direction of hydraulic oil with the port P is switched, when a second working port B2 is communicated with a third working port B3 and a first working port A1 is communicated with a third working port A3, the hydraulic oil with the port P enters a speed change valve oil port on the transmission through a port a, and when a first working port B1 is communicated with a third working port B3, the hydraulic oil with the port P enters a speed change valve oil port on the transmission through a port B; thereby controlling the gearbox to realize gear increasing and gear decreasing.
In one embodiment, the speed change valve further comprises a valve core I5, the valve core I5 and the reversing valve core 3 are abutted against each other, and a spring I6 is arranged between the valve core I5 and the inner wall of the valve body; the speed change valve core 4 comprises a speed change valve core I401 and a speed change valve core II 402, and a spring II 7 is arranged between the speed change valve core I401 and the speed change valve core II 402.
In one embodiment, an oil port F and an oil port R are respectively arranged on the pilot oil path of the reversing valve core 3, and an oil inlet FR, an execution oil port Fc and an execution oil port Rc are arranged on the main oil path of the reversing valve core 3; an oil port A and an oil port B are respectively arranged on a pilot oil path of the speed change valve core 4, and an oil inlet PC, an execution oil port 1C, an execution oil port 2C and an execution oil port 3C are arranged on a main oil path of the speed change valve core 4.
In one embodiment, an oil port F on the pilot oil path takes oil to control the reversing valve core 3 to move right, and an oil inlet FR is communicated with an execution oil port Fc to realize a forward function; an oil port R on the pilot oil way controls the reversing valve core 3 to move leftwards, and an oil inlet FR is communicated with an execution oil port Rc to realize the retreating function.
In one embodiment, an oil inlet A on the pilot oil way is used for feeding oil to control the transmission valve core 4 to move right, and an oil inlet PC is communicated with the execution oil port 1C, so that a 1-gear function is realized; an oil inlet B on the pilot oil way is used for feeding oil to control the left movement of the speed change valve core 4, and the oil inlet PC is communicated with the execution oil port 2C to realize the 2-gear function; when the oil port A and the oil port B on the pilot oil way are both free of control oil, the oil inlet PC is communicated with the execution oil port 3C, and the 3-gear function is realized.
In one embodiment, the steering brake valve comprises a valve body 12, a left steering brake cavity, a right steering brake cavity, an oil inlet cavity P and an oil return cavity T are formed in the valve body 12, a valve core II 8 and a valve core III 9 are respectively arranged in the left steering brake cavity and the right steering brake cavity, and one end of each of the valve core II 8 and the valve core III 9 is respectively provided with a spring III 10 and a spring IV 11; a left steering clutch oil inlet CL is arranged on one side of the left steering brake cavity, and a pilot oil supply port PCL is arranged on the other side of the left steering brake cavity; one side of the right steering brake cavity is provided with a right steering clutch oil inlet CR, and the other side is provided with a pilot oil supply port PCR; the left steering brake cavity and the right steering brake cavity are communicated with the oil inlet cavity P, and the left steering brake cavity and the right steering brake cavity are communicated with the oil return cavity T; the left steering clutch and the right steering clutch are connected with the left steering brake and the right steering brake respectively.
In one embodiment, when the oil inlet chamber P, the pilot oil supply port PCL and the pilot oil supply port PCR are filled with oil, the valve core ii 8 or the valve core iii 9 moves to the side away from the spring iii 10 or the spring iv 11, and the oil inlet chamber P is communicated with the left steering clutch oil inlet CL or the right steering clutch oil inlet CR to supply oil to the left steering clutch or the right steering clutch.
In one embodiment, when the oil inlet cavity P and the pilot oil supply port PCR are filled and the pilot oil of the pilot oil supply port PCL is cut off, the valve core II 8 moves to the side close to the spring III 10, the oil inlet CL of the left steering clutch is communicated with the oil return cavity T for pressure relief, the oil supply of the left steering clutch is cut off, the oil supply of the right steering clutch is normally supplied, the brake is used for braking, and the power is driven by the right chain wheel to realize left steering.
In one embodiment, when the oil inlet cavity P and the pilot oil supply port PCL are filled with oil and the pilot oil of the pilot oil supply port PCR is cut off, the valve core III 9 moves to the side close to the directional spring IV 11, the oil inlet CR of the right steering clutch is communicated with the oil return cavity T for pressure relief, the oil supply of the right steering clutch is cut off, the oil supply of the left steering clutch is normally supplied, the brake brakes, and the power drives by the left side chain wheel to realize right steering.
The above is the preferred embodiment of the present invention, and the technical personnel in the field of the present invention can also change and modify the above embodiment, therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by the technical personnel in the field on the basis of the present invention all belong to the protection scope of the present invention.
Claims (10)
1. A walking hydraulic pilot control system, comprising:
the pilot oil way is provided with a plurality of oil ports and is used for outputting pressure oil by the actuating mechanism;
the main oil way is provided with a plurality of oil ports and is respectively connected with corresponding actuating mechanisms;
the walking pilot valve is connected with the control oil way and controls a plurality of conduction states through a pilot valve handle (13);
an actuator, comprising:
the shifting valve is communicated with a speed changing valve oil port on the gearbox through an a port and a b port respectively, the shifting valve is connected with the priority valve through a P port, the shifting valve is connected with the rear axle box through a T port, and the walking pilot valve is electrically connected with the shifting valve through an electromagnetic valve;
the speed change valve comprises a reversing valve core (3), a speed change valve core (4) and a plurality of oil ports, the oil ports on the pilot oil way push the reversing valve core (3) and the speed change valve core (4) to move to control the on-off of each oil port in the speed change valve through output pressure oil so as to realize reversing and gear change, and the walking pilot valve is connected with the speed change valve through a plurality of control oil ways;
the steering brake valve is respectively connected with the left steering clutch and the right steering clutch through the oil inlet cavity P and respectively supplies oil to the left steering clutch and the right steering clutch so as to realize left-side or right-side steering; and the walking pilot valve is connected with the steering brake valve through a plurality of control oil ways.
2. The walking hydraulic pilot control system according to claim 1, characterized in that: the gear shifting valve comprises a gear shifting valve I (1) and a gear shifting valve II (2), and the gear shifting valve I (1) and the gear shifting valve II (2) are respectively and electrically connected with a gear-up button and a gear-down button on a pilot valve handle (13) through electromagnetic valves; the first working port (A1) of the shift valve I (1) is connected with a speed changing valve oil port on the gearbox through a port, the second working port (A2) of the shift valve I (1) is connected with a T port through an oil path, and the shift valve
The third working port (A3) of I (1) is connected with the second working port (B2) of the gear shifting valve II (2) through an oil path, the first working port (B1) of the gear shifting valve II (2) is connected with a speed changing valve oil port on the gearbox through a port B, the third working port (B3) of the gear shifting valve II (2) is connected with a port P, and the fourth working port (B4) of the gear shifting valve II (2) is connected with a port T.
3. The walking hydraulic pilot control system according to claim 1, characterized in that: the speed change valve also comprises a valve core I (5), the valve core I (5) and the reversing valve core (3) are mutually abutted, and a spring I (6) is arranged between the valve core I (5) and the inner wall of the valve body; the speed change valve core (4) comprises a speed change valve core I (401) and a speed change valve core II (402), and a spring II (7) is arranged between the speed change valve core I (401) and the speed change valve core II (402).
4. The walking hydraulic pilot control system according to claim 3, characterized in that: an oil port F and an oil port R are respectively arranged on a pilot oil path of the reversing valve core (3), and an oil inlet FR, an execution oil port Fc and an execution oil port Rc are arranged on a main oil path of the reversing valve core (3); an oil port A and an oil port B are respectively arranged on a pilot oil path of the speed change valve core (4), and an oil inlet PC, an execution oil port 1C, an execution oil port 2C and an execution oil port 3C are arranged on a main oil path of the speed change valve core (4).
5. The walking hydraulic pilot control system according to claim 4, characterized in that: an oil port F on the pilot oil way is used for feeding oil to control the reversing valve core (3) to move rightwards, and the oil inlet FR is communicated with an execution oil port Fc to realize the advancing function; an oil port R on the pilot oil way controls the reversing valve core (3) to move leftwards, and the oil inlet FR is communicated with the execution oil port Rc to realize the retreating function.
6. The walking hydraulic pilot control system according to claim 4, characterized in that: an oil inlet A on the pilot oil way controls the right movement of the speed change valve core (4), and the oil inlet PC is communicated with the execution oil port 1C to realize the 1-gear function; an oil inlet B on the pilot oil way is used for feeding oil to control the left movement of the speed change valve core (4), and the oil inlet PC is communicated with the execution oil port 2C to realize the 2-gear function; and when the oil port A and the oil port B on the pilot oil way are both free of control oil, the oil inlet PC is communicated with the execution oil port 3C, so that a 3-gear function is realized.
7. The walking hydraulic pilot control system according to claim 1, characterized in that: the steering brake valve comprises a valve body (12), a left steering brake cavity, a right steering brake cavity, an oil inlet cavity P and an oil return cavity T are formed in the valve body (12), a valve core II (8) and a valve core III (9) are respectively arranged in the left steering brake cavity and the right steering brake cavity, and a spring III (10) and a spring IV (11) are respectively arranged at one end of the valve core II (8) and one end of the valve core III (9); a left steering clutch oil inlet CL is arranged on one side of the left steering brake cavity, and a pilot oil supply port PCL is arranged on the other side of the left steering brake cavity; a right steering clutch oil inlet CR is arranged at one side of the right steering brake cavity, and a pilot oil supply port PCR is arranged at the other side of the right steering brake cavity; the left steering brake cavity and the right steering brake cavity are communicated with the oil inlet cavity P, and the left steering brake cavity and the right steering brake cavity are communicated with the oil return cavity T; the left steering clutch and the right steering clutch are respectively connected with the left steering brake and the right steering brake.
8. The walking hydraulic pilot control system according to claim 7, characterized in that: when the oil inlet cavity P, the pilot oil supply port PCL and the pilot oil supply port PCR are used for oil inlet, the valve core II (8) or the valve core III (9) moves to one side far away from the spring III (10) or the spring IV (11), and the oil inlet cavity P is communicated with the oil inlet CL of the left steering clutch or the oil inlet CR of the right steering clutch to supply oil to the left steering clutch or the right steering clutch.
9. The walking hydraulic pilot control system according to claim 7, characterized in that: when the oil inlet cavity P and the guide oil supply port PCR are filled with oil and the guide oil of the guide oil supply port PCL is cut off, the valve core II (8) moves to one side close to the spring III (10), the oil inlet CL of the left steering clutch is communicated with the oil return cavity T to release pressure, the left steering clutch cuts off the oil supply, and the right steering clutch normally supplies the oil to realize left steering.
10. The walking hydraulic pilot control system according to claim 7, characterized in that: when the oil inlet cavity P and the pilot oil supply port PCL are filled with oil and the pilot oil of the pilot oil supply port PCR is cut off, the valve core III (9) moves to one side close to the spring IV (11), the oil inlet CR of the right steering clutch is communicated with the oil return cavity T to release the pressure, the right steering clutch cuts off the oil supply, and the left steering clutch normally supplies the oil to realize right steering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922476212.8U CN211692993U (en) | 2019-12-31 | 2019-12-31 | Walking hydraulic pilot control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922476212.8U CN211692993U (en) | 2019-12-31 | 2019-12-31 | Walking hydraulic pilot control system |
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| CN211692993U true CN211692993U (en) | 2020-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043088A (en) * | 2019-12-31 | 2020-04-21 | 柳工常州机械有限公司 | Walking hydraulic pilot control system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043088A (en) * | 2019-12-31 | 2020-04-21 | 柳工常州机械有限公司 | Walking hydraulic pilot control system |
| CN111043088B (en) * | 2019-12-31 | 2024-05-17 | 柳工常州机械有限公司 | Walking hydraulic pilot control system |
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