CN216788846U - Walking driving hydraulic control system with high-speed transition function and milling machine - Google Patents
Walking driving hydraulic control system with high-speed transition function and milling machine Download PDFInfo
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- CN216788846U CN216788846U CN202220345169.0U CN202220345169U CN216788846U CN 216788846 U CN216788846 U CN 216788846U CN 202220345169 U CN202220345169 U CN 202220345169U CN 216788846 U CN216788846 U CN 216788846U
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Abstract
The utility model discloses a walking drive hydraulic control system with a high-speed transition function and a milling machine, comprising an oil tank, a walking motor, a walking pump, a flow divider, a variable speed control valve and a brake control valve; a free wheel valve is integrated on the flow divider, and the flow divider is connected with a flow dividing control valve; the walking pump is integrated with a main pump, an oil supplementing pump, a high-pressure overflow valve, an oil supplementing check valve, an oil supplementing pump overflow valve, a cut-off overflow valve and a proportional valve, the proportional valve is controlled to realize the whole-course stepless regulation of the advancing and retreating speed and the speed of the walking drive of the whole machine, the high-pressure overflow valve and the oil supplementing check valve realize the high-pressure safe unloading and the low-pressure side oil supplementing of the system, the oil supplementing pump overflow valve realizes the pressure limitation of the oil supplementing pump, and the cut-off overflow valve realizes the overload protection of the system. The utility model improves the use efficiency of the whole machine, saves the consignment cost of the whole machine for transition, effectively adapts to the working condition range of frequent short-distance transition, effectively improves the satisfaction degree of users and enhances the market competitiveness of the series milling machinery products.
Description
Technical Field
The utility model relates to a walking driving hydraulic control system with a high-speed transition function and a milling machine, and belongs to the technical field of milling machine control.
Background
The milling machine is a special mechanical device for maintenance operation of highways and urban roads, and is widely applied to excavation and renovation of asphalt concrete surface layers of highways, airports, docks, parking lots and the like, removal of pavement diseases, road repair under the condition of damaged roadbeds and the like.
The walking driving function of the milling machine is generally divided into two working conditions of working and transition, the common short-distance transition can be directly executed by a transition gear, and the long-distance transition needs special vehicle consignment. However, in some regional cities, because the urban area is not large, based on the transition time and cost consideration, the milling machine is expected to improve the transition speed, the transition is performed quickly in a slightly long distance, the overall operation efficiency of the whole machine is improved, and the transition cost is saved.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a walking driving hydraulic control system with a high-speed transition function, which can realize the switching of two gears of walking speed, and under the transition working condition, the walking driving is switched to the high-speed gear, so that the use efficiency of the whole machine is improved, the transition consignment cost of the whole machine is saved, the working condition range of frequent short-distance transition is effectively adapted, the satisfaction degree of users is effectively improved, and the market competitiveness of series milling machinery products is enhanced.
Another object of the utility model is to provide a milling machine equipped with the walking drive hydraulic control system with high-speed transition function.
In order to achieve the purpose, the walking driving hydraulic control system with the high-speed transition function comprises an oil tank, a front left walking motor, a front right walking motor, a rear left walking motor, a walking pump, a flow dividing valve, a variable speed control valve and a brake control valve;
a free wheel valve is integrated on the flow divider, the flow divider is connected with a flow dividing control valve, and the flow dividing and free wheel function switching of the flow divider is realized through the flow dividing control valve;
the walking pump is integrated with a main pump, an oil supplementing pump, a high-pressure overflow valve, an oil supplementing check valve, an oil supplementing pump overflow valve, a cut-off overflow valve and a proportional valve, the proportional valve is controlled to realize the whole-course stepless regulation of the advancing and retreating speed and the speed of the walking drive of the whole machine, the high-pressure overflow valve and the oil supplementing check valve realize the high-pressure safe unloading and the low-pressure side oil supplementing of the system, the oil supplementing pump overflow valve realizes the pressure limitation of the oil supplementing pump, and the cut-off overflow valve realizes the overload protection of the system.
As an improvement, the front left walking motor and the front right walking motor are high-speed plunger motors.
As an improvement, the rear left traveling motor and the rear right traveling motor are low-speed and high-torque motors.
As an improvement, a flushing valve is further integrated in the walking pump.
As an improvement, an air filter is arranged on the oil tank.
The improved structure of the hydraulic control system comprises a damping joint and a one-way valve, wherein the damping joint and the one-way valve are used for realizing the complete retraction of the plunger when the rear left walking motor and the rear right walking motor are switched to the working condition of a free wheel.
As an improvement, the oil supplementing pump absorbs oil from the oil tank through an oil absorption filter.
As an improvement, shell return oil of the walking pump, shell return oil of the walking motor and return oil of the flow dividing control valve all return to the oil tank through an oil return filter.
In addition, the utility model also provides a milling machine, and the walking driving hydraulic control system with the high-speed transition function is installed on the milling machine.
Compared with the prior art, the utility model improves the use efficiency of the whole machine, saves the consignment cost of the whole machine for transition, effectively adapts to the working condition range of frequent short-distance transition, effectively improves the satisfaction degree of users and enhances the market competitiveness of the series milling and planing mechanical products.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
in the figure: 1. the hydraulic control system comprises an oil tank, 2, a front left traveling motor, 3, oil supplementing check valves I and I, 4, oil supplementing check valves II and II, 5, high-pressure overflow valves I and II, 6, high-pressure overflow valves II and 7, an oil supplementing pump overflow valve, 8, a flushing valve, 9, a shuttle valve, 10, a traveling pump, 11, a cut-off overflow valve, 12, a proportional valve, 13, a main pump, 14, an oil supplementing pump, 15, a flow dividing control valve, 16, a front right traveling motor, 17, a flow dividing valve, 18, a free wheel valve, 19, a damping joint, 20, a rear right traveling motor, 21, a speed change control valve, 22, a braking control valve, 23, a rear left traveling motor, 24, an air filter, 25, a check valve, 26, an oil return filter, 27 and an oil absorption filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the utility model and not to limit the scope of the utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
As shown in fig. 1, a traveling drive hydraulic control system with a high-speed transition function includes an oil tank 1, a front left traveling motor 2, a front right traveling motor 16, a rear right traveling motor 20, a rear left traveling motor 23, a traveling pump 10, a flow dividing valve 17, a variable speed control valve 21, and a brake control valve 22;
a free wheel valve 18 is integrated on the diverter valve 17, the diverter valve 17 is connected with a diverter control valve 15, the diverter valve 15 is used for realizing the diversion and free wheel function switching, and the free wheel valve 18 is combined to realize the diversion of the working gear of the whole machine and the free wheel follow-up of two rear wheels at the transition gear;
the walking pump 10 is integrated with a main pump 13, an oil supplementing pump 14, a high-pressure overflow valve, an oil supplementing check valve, an oil supplementing pump overflow valve 7, a cut-off overflow valve 11 and a proportional valve 12, the proportional valve 12 controls and realizes the whole-course stepless adjustment of the advancing and retreating speed of the walking drive of the whole machine, the high-pressure overflow valve and the oil supplementing check valve realize the high-pressure safe unloading and the low-pressure side oil supplementing of the system, the oil supplementing pump overflow valve 7 realizes the pressure limitation of the oil supplementing pump 14, and the cut-off overflow valve 11 realizes the overload protection of the system. Specifically, the relief valve 11 is cut off to realize overload and overpressure protection of circulation oil paths between the main pump 13 and the front left traveling motor 2, the front right traveling motor 16, the rear left traveling motor 23 and the rear right traveling motor 20, when the system encounters load impact, the relief valve 11 is cut off to realize pressure cut-off, the discharge capacity of the main pump 13 returns to zero, and the whole machine stops traveling. The high-pressure overflow valve I5, the high-pressure overflow valve II 6, the oil supplementing check valve I3 and the oil supplementing check valve II 4 can realize high-pressure overflow of a circulating oil path between the main pump 13 and the front left traveling motor 2, the front right traveling motor 16, the rear left traveling motor 23 and the rear right traveling motor 20, are used for overload protection, and can supplement oil to a low-pressure side through the oil supplementing pump 14 to make up for leakage of hydraulic oil. The overflow valve 7 of the oil supplementing pump is used for limiting the highest pressure of the oil supplementing pump 14, and the oil supplementing pump 14 can realize the following three functions: the main pump 13 controls the supply of oil source, the speed change control valve 21 and the brake control valve 22 control the oil source of oil circuit, the flow divider valve 17 supplements oil and supplements system leakage.
As a modification of the embodiment, the front left travel motor 2 and the front right travel motor 16 are high-speed plunger motors, and the large and small displacement switching is realized through a variable speed control valve 21; the rear left traveling motor 23 and the rear right traveling motor 20 are low-speed and high-torque motors.
As an improvement of the embodiment, a flushing valve 8 is further integrated in the traveling pump 10, and the flushing valve 8 realizes that the low-pressure side of hydraulic oil circulating between the main pump 13 and the front left traveling motor 2, the front right traveling motor 16, the rear left traveling motor 23, and the rear right traveling motor 20 is flushed to the hydraulic oil tank, so that the temperature of the hydraulic oil of the system is effectively reduced, and the purpose of dissipating heat of the system is achieved.
As a modification of the embodiment, an air filter 24 is installed on the oil tank 1 to improve the cleanliness of oil.
As an improvement of the embodiment, the hydraulic control system for the walking drive further comprises a damping joint 19 and a one-way valve 25, wherein the damping joint 19 and the one-way valve 25 are used for ensuring that the shell pressures of the rear left walking motor 23 and the rear right walking motor 20 are always maintained between 1.5bar and 2.5bar, so that the shell pressures of the rear left walking motor and the rear right walking motor are not too high, the service life of the motors is effectively ensured, and sufficient pressure of the shell of the rear left walking motor and the shell of the rear right walking motor can seal the plungers of the two motors when the high-speed transition is carried out, and the pistons are smoothly switched to the free wheel working condition.
As a modification of the embodiment, the oil supplement pump 14 sucks oil from the oil tank 1 through the oil suction filter 27, so that the service life of the oil supplement pump 14 is effectively protected; and shell return oil of the walking pump 10, shell return oil of the walking motor and return oil of the flow dividing control valve 15 all return to the oil tank 1 through the return oil filter 26, so that the cleanliness of the system is effectively guaranteed, and the failure rate is reduced.
Finally, the utility model also provides a milling machine, and the walking driving hydraulic control system with the high-speed transition function is installed on the milling machine.
The walking driving hydraulic control system can realize three working states: the construction method comprises the following steps of shallow milling operation, deep milling operation and high-speed transition, wherein different walking driving speeds are selected according to the requirements of actual working conditions, and relevant construction operation is carried out.
Shallow milling operation condition:
the oil supplementing pump 14 absorbs oil from the oil tank 1 through the oil absorption filter 27, the electromagnet Y1 of the proportional valve 12 is electrified, the electromagnet Y2 is deenergized, the given current is 1000mA maximum current, the electromagnet Y6 of the shunt control valve 15 is electrified, the electromagnet Y3 of the free wheel valve 18 is electrified, the electromagnet Y5 of the variable speed control valve 21 is deenergized, and the electromagnet Y4 of the brake control valve 22 is electrified; a part of the hydraulic oil of the oil supply pump 14 supplies hydraulic oil to the flow dividing valve 17 through a port G of the oil supply pump 14, and the other part supplies oil to the brake control valve 22 through a port G of the oil supply pump 14 so as to supply the K ports of the front left traveling motor 2 and the front right traveling motor 16 to release the parking brake; the flow dividing control valve 15 supplies high-pressure oil from the main pump 13 and the shuttle valve 9 to an X port of the flow dividing valve to control the flow dividing valve 17 to be switched to a fine flow dividing position a, so that the walking anti-slip function is realized; the third part of the oil from the oil feed pump 14 is supplied to the port P of the flow dividing valve 17 through the port P of the main pump 13, and is supplied to the front left traveling motor 2 and the front right traveling motor 16 from the port D, A of the flow dividing valve 17 to drive the two front wheel motors to rotate at high speed, and is supplied to the rear right traveling motor 20 and the rear left traveling motor 23 through the ports B1 and C1 at the position a of the freewheel valve 18 to drive the two rear wheel motors to travel at low speed.
Deep milling operation condition:
the oil supplementing pump 14 absorbs oil from the oil tank 1 through the oil absorption filter 27, the electromagnet Y1 of the proportional valve 12 is electrified, the electromagnet Y2 is deenergized, the given current is 30% of the maximum current, the electromagnet Y6 of the shunt control valve 15 is electrified, the electromagnet Y3 of the free wheel valve 18 is electrified, the electromagnet Y5 of the variable speed control valve 21 is deenergized, and the electromagnet Y4 of the brake control valve 22 is electrified; a part of the hydraulic oil of the oil replenishment pump 14 replenishes the flow dividing valve 17 with hydraulic oil through a port G of the oil replenishment pump 14, and the other part of the hydraulic oil supplies the brake control valve 22 through a port G of the oil replenishment pump 14 to supply the K ports of the front left travel motor 2 and the front right travel motor 16 to release the parking brake. The flow dividing control valve 15 supplies high-pressure oil from the main pump 13 and the shuttle valve 9 to the X port of the flow dividing valve to control the flow dividing valve 17 to be switched to a fine flow dividing position a, so that the walking anti-slip function is realized. The main pump 13 is controlled by a third part of the oil from the oil replenishment pump 14 via the proportional valve 12, the oil is supplied to the port P of the diverter valve 17 via the port P of the main pump 13, and is supplied from the port D, A of the diverter valve to the front left traveling motor 2 and the front right traveling motor 16, respectively, to drive the two front wheel motors to rotate at high speed, and is supplied to the rear right traveling motor 20 and the rear left traveling motor 23 via the ports B1 and C1 at the position a of the free wheel valve 18, respectively, to drive the two rear wheel motors to travel at low speed.
High-speed transition working condition:
the oil supplementing pump 14 absorbs oil from the oil tank 1 through the oil absorption filter 27, the electromagnet Y1 of the proportional valve 12 is powered on, the electromagnet Y2 is powered off, the given current is 100% of the maximum current, the electromagnet Y6 of the shunt control valve 15 is powered off, the electromagnet Y3 of the free wheel valve 18 is powered off, the electromagnet Y5 of the variable speed control valve 21 is powered on, and the electromagnet Y4 of the brake control valve 22 is powered on. A part of the hydraulic oil of the oil supply pump 14 supplies the hydraulic oil to the flow dividing valve 17 through a port G of the oil supply pump 14, and the other part supplies the hydraulic oil to the shift control valve 21 and the brake control valve 22 through a port G of the oil supply pump 14 to supply the hydraulic oil to ports X, K of the front left traveling motor 2 and the front right traveling motor 16, so that the functions of switching the front left and front right motors to the small displacement positions and releasing the parking brake are respectively realized. The pressure of the oil at the X port is relieved through the shunt control valve 15, and the X port and the shunt valve 17 are switched to the position b of the free wheel valve 18, so that the free differential function is realized. The third part of the oil supplementing pump 14 controls the main pump 13 through the proportional valve 12, the oil is supplied to the port P of the diverter valve 17 through the port P of the main pump 13, is supplied to the front left traveling motor 2 and the front right traveling motor 16 from the port D, A of the diverter valve respectively to drive the two front wheel motors to rotate at high speed, and is supplied to the rear right traveling motor 20 and the rear left traveling motor 23 through the ports B1 and C1 at the position B of the freewheel valve 18 to realize the free wheel working conditions of the two rear wheel motors respectively, thereby realizing the high-speed transition of the whole machine.
The utility model is based on the original milling machinery walking driving system, adds a free wheel valve and integrates on the shunt valve, configures the front left and front right walking motors as high-speed motors, configures the rear left and rear right walking motors as low-speed large-torque motors, and realizes the three-gear switching of the whole machine working gear and the transition gear through the switching of the variable speed control valve and the free wheel valve, especially the whole machine walking speed can reach 12Km/h at the transition gear, and the whole machine walking speed can be adjusted in a stepless way through the electric proportional walking pump, thereby realizing the rapid and high-efficiency transition and saving the whole machine consignment cost. The system is provided with an oil suction filter and an oil return filter, so that the oil cleanliness of the whole system is effectively ensured.
The utility model effectively meets the requirements of the construction operation of the whole machine, particularly has the function of high-speed transition, can realize high-speed and high-efficiency transition, improves the use efficiency of the whole machine, saves the consignment cost of the transition of the whole machine, effectively adapts to the working condition range of slightly long-distance transition, effectively improves the satisfaction degree of users and enhances the market competitiveness of series milling machinery products.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The walking drive hydraulic control system with the high-speed transition function is characterized by comprising an oil tank (1), a front left walking motor (2), a front right walking motor (16), a rear right walking motor (20), a rear left walking motor (23), a walking pump (10), a flow dividing valve (17), a variable speed control valve (21) and a brake control valve (22);
a free wheel valve (18) is integrated on the flow divider (17), the flow divider (17) is connected with a flow dividing control valve (15), and the flow dividing and free wheel function switching of the flow divider is realized through the flow dividing control valve (15);
the walking pump (10) is integrated with a main pump (13), an oil supplementing pump (14), a high-pressure overflow valve, an oil supplementing check valve, an oil supplementing pump overflow valve (7), a cut-off overflow valve (11) and a proportional valve (12), the proportional valve (12) controls and realizes the whole-course stepless regulation of the advancing and retreating speed of the walking drive of the whole machine, the high-pressure overflow valve and the oil supplementing check valve realize the high-pressure safe unloading and the low-pressure side oil supplementing of the system, the oil supplementing pump overflow valve (7) realizes the pressure limitation of the oil supplementing pump (14), and the cut-off overflow valve (11) realizes the overload protection of the system.
2. The hydraulic control system with high-speed transition function for walking drive according to claim 1, wherein the front left walking motor (2) and the front right walking motor (16) are high-speed plunger motors.
3. The traveling drive hydraulic control system with a high-speed transition function according to claim 1 or 2, wherein the rear left traveling motor (23) and the rear right traveling motor (20) are low-speed large-torque motors.
4. The walking drive hydraulic control system with high-speed transition function according to claim 1, characterized in that a flushing valve (8) is further integrated in the walking pump (10).
5. The walking drive hydraulic control system with high-speed transition function according to claim 1, wherein an air cleaner (24) is mounted on the oil tank (1).
6. The walking drive hydraulic control system with high-speed transition function according to claim 1, further comprising a damping joint (19) and a one-way valve (25), wherein the damping joint (19) and the one-way valve (25) are used for realizing the complete retraction of the plunger when the rear left walking motor and the rear right walking motor are switched to a free wheel working condition.
7. The walking drive hydraulic control system with high-speed transition function according to claim 1, wherein the oil supply pump (14) sucks oil from the oil tank (1) through an oil suction filter (27).
8. The traveling drive hydraulic control system with a high-speed transition function according to claim 7, wherein the return oil of the casing of the traveling pump (10), the return oil of the casing of the traveling motor, and the return oil of the flow dividing control valve (15) are returned to the oil tank (1) through an oil return filter (26).
9. Milling machine, characterized in that, the milling machine is provided with a walking drive hydraulic control system with high-speed transition function according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220345169.0U CN216788846U (en) | 2022-02-21 | 2022-02-21 | Walking driving hydraulic control system with high-speed transition function and milling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220345169.0U CN216788846U (en) | 2022-02-21 | 2022-02-21 | Walking driving hydraulic control system with high-speed transition function and milling machine |
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| Publication Number | Publication Date |
|---|---|
| CN216788846U true CN216788846U (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220345169.0U Active CN216788846U (en) | 2022-02-21 | 2022-02-21 | Walking driving hydraulic control system with high-speed transition function and milling machine |
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| Country | Link |
|---|---|
| CN (1) | CN216788846U (en) |
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2022
- 2022-02-21 CN CN202220345169.0U patent/CN216788846U/en active Active
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