CN111749956B - Hydraulic control system for multipurpose wheeled engineering vehicle - Google Patents
Hydraulic control system for multipurpose wheeled engineering vehicle Download PDFInfo
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- CN111749956B CN111749956B CN202010573967.4A CN202010573967A CN111749956B CN 111749956 B CN111749956 B CN 111749956B CN 202010573967 A CN202010573967 A CN 202010573967A CN 111749956 B CN111749956 B CN 111749956B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/26—Rollers therefor; Such rollers usable also for compacting soil self-propelled or fitted to road vehicles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/425—Drive systems for dipper-arms, backhoes or the like
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Architecture (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a hydraulic control system for a multipurpose wheel type engineering truck, which comprises an oil tank, a function switching valve, a movable arm oil cylinder, a loading oil cylinder and a rolling roller hydraulic motor, wherein an oil pump is installed in the oil tank, the oil pump is respectively communicated with the movable arm oil cylinder and the function switching valve through an oil supply main pipe and an oil return main pipe, the loading oil cylinder and the rolling roller hydraulic motor are connected to the function switching valve in parallel, and the oil supply main pipe is communicated with the oil return main pipe through an oil drain valve. By adopting the technical scheme of the invention, when the wheel type engineering truck is applied to different working modes, the oil drain valve can release excessive pressure in the oil path system according to requirements, so that the requirements of the wheel type engineering truck in different working modes are met, the safety overflow valve is also connected between the oil supply main pipe and the oil return main pipe, the safety overflow valve further ensures that the oil pressure of the oil path in the hydraulic control system corresponding to the wheel type engineering truck is in a rated working pressure condition, the damage to related hydraulic elements is prevented, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of engineering vehicles, in particular to a hydraulic control system for a multipurpose wheeled engineering vehicle.
Background
The wheel type engineering vehicle is a special engineering vehicle which can be quickly maneuvered and has multiple emergency operation modes, and meanwhile, the wheel type engineering vehicle has strong cross-country capacity, difficulty-escaping capacity and self-protection capacity, in order to expand the application range of the wheel type engineering vehicle, people can generally carry different working devices on the wheel type engineering vehicle, a common multipurpose wheel type engineering vehicle is generally provided with a loading bucket or a rolling roller, the loading bucket can be used as a loader when carrying the loading bucket, and the rolling roller can be used as a road roller when carrying the rolling roller, however, because the movement modes of the loading bucket and the rolling roller are completely different, the stress states of the loading bucket and the rolling roller are also completely different when in operation, the oil line oil pressures in corresponding hydraulic control systems are also required to be different, when the hydraulic control systems of the loading bucket or the rolling roller are switched, the two hydraulic systems share an oil tank, the oil pressure of oil paths in the two hydraulic control systems cannot be adjusted, and a loading bucket or a grinding roller of the wheel type engineering vehicle in different working modes does not run in a rated state, so that the normal running of the multipurpose wheel type engineering vehicle is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hydraulic control system for a multipurpose wheeled engineering vehicle.
The invention is realized by the following technical scheme.
The invention provides a hydraulic control system for a multipurpose wheel type engineering truck, which comprises a truck body, wherein a mechanical arm is arranged on the truck body, a detachable loading bucket or a milling roller is arranged at the tail end of the mechanical arm, the hydraulic control system comprises an oil tank, a function switching valve, a movable arm oil cylinder, a loading oil cylinder and a milling roller hydraulic motor, the movable arm oil cylinder is used for driving the mechanical arm to move up or down, the loading oil cylinder is used for adjusting the posture of the loading bucket relative to the mechanical arm, the milling roller hydraulic motor is used for driving the milling roller to rotate, an oil pump is arranged in the oil tank, an oil supply main pipe is connected onto the oil pump, an oil supply pipe A and an oil supply pipe B are connected onto the oil supply main pipe in parallel, the oil supply pipe A is communicated with an oil inlet of the movable arm oil cylinder, the oil supply pipe B is communicated with an oil inlet of the function switching valve, the hydraulic control system comprises a function switching valve, a loading oil cylinder, a rolling roller hydraulic motor, a movable arm oil cylinder, an oil outlet, an oil return pipe A, an oil return pipe B, an oil return main pipe, an oil drain valve, a signaling line A, a signaling line B, a function switching valve control end, a signaling line D and a multipurpose wheel type engineering vehicle electric control system, wherein the loading oil cylinder and the rolling roller hydraulic motor are connected to the function switching valve in parallel, the oil outlet of the movable arm oil cylinder is further connected with the oil return pipe A, the oil return pipe A is connected with the oil return pipe B and then communicated with an oil tank through the oil return main pipe, the oil supply main pipe is communicated with the oil return main pipe through the oil drain valve, the oil supply pipe A and the oil return pipe A are further connected together through the electromagnetic switching valve B, the control end of the electromagnetic switching valve A is connected with the signaling line A, the control end of the electromagnetic switching valve A is connected with the signaling line B, the control end of the electromagnetic switching valve A is connected with the signaling line D, the signaling line A is connected with the multipurpose wheel type engineering vehicle electric control system, and diodes A are respectively arranged between the signaling line D and the signaling line A, between the signaling line D and the signaling line B, and between the signaling line D and the signaling line C.
And the oil return main pipe is also connected with an oil return filter.
The oil supply main pipe is also communicated with the oil return main pipe through a safety overflow valve.
The oil supply pipe A is further connected with a safety valve, the safety valve is arranged between the oil inlet of the movable arm oil cylinder and the electromagnetic reversing valve A, and the signaling line A is further electrically connected with the control end of the safety valve through a diode C.
And a one-way valve is also connected between the oil inlet of the rolling roller hydraulic motor and the function switching valve.
And the signaling line A and the signaling line B are also connected with self-return switches, and the signaling line C is also electrically connected with the control ends of the self-return switches respectively.
The signaling line C is also electrically connected with the signaling line B and the signaling line A through a diode B respectively.
The oil supply pipe A and the oil return pipe A are also connected together through a floating valve, the floating valve and the electromagnetic directional valve A are arranged in parallel, and the control end of the floating valve is electrically connected with the signaling line C.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the oil drain valve is connected between the oil supply main pipe and the oil return main pipe, when the wheel type engineering truck is applied to different working modes, the oil pressure of an oil way system required by a bucket-carrying hydraulic control system or a rolling roller hydraulic control system is different, the oil drain valve can release the overlarge pressure in the oil way system according to the requirement, thereby meeting the requirements of the wheel type engineering truck in different working modes, improving the safety and in addition, the safety overflow valve is connected between the oil supply main pipe and the oil return main pipe, and further ensures that the oil pressure of an oil way in a hydraulic control system corresponding to the wheel type engineering truck is in a rated working pressure condition, so that related hydraulic elements are prevented from being damaged.
Drawings
Fig. 1 is a schematic structural view of a utility wheeled mobile working vehicle according to the present invention;
fig. 2 is a schematic view of the structure of a loading bucket of the multipurpose wheel type engineering vehicle;
fig. 3 is a schematic connection diagram of the hydraulic control system for a utility wheeled work vehicle of the present invention.
In the figure: 1-vehicle body, 2-mechanical arm, 3-rolling roller, 4-loading bucket, 5-oil tank, 6-function switching valve, 7-boom cylinder, 8-loading cylinder, 9-rolling roller hydraulic motor, 10-oil pump, 11-oil supply main pipe, 12-oil supply pipe A, 13-oil supply pipe B, 14-oil return pipe A, 15-oil return pipe B, 16-oil return main pipe, 17-oil drain valve, 18-electromagnetic directional valve A, 19-electromagnetic directional valve B, 20-signaling line A, 21-signaling line B, 22-signaling line C, 23-signaling line D, 24-diode A, 25-oil return filter, 26-safety overflow valve, 27-safety valve, 28-self-return switch, 29-diode B, 30-floating valve, 31-diode C.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, 2 and 3, the present invention provides a hydraulic control system for a multipurpose wheel type engineering vehicle, the multipurpose wheel type engineering vehicle includes a vehicle body 1, a mechanical arm 2 is mounted on the vehicle body 1, a detachable loading bucket 4 or a milling roller 3 is mounted at the end of the mechanical arm 2, the hydraulic control system includes an oil tank 5, a function switching valve 6, a boom cylinder 7, a loading cylinder 8 and a milling roller hydraulic motor 9, the boom cylinder 7 is used for driving the mechanical arm 2 to move up or down, the loading cylinder 8 is used for adjusting the posture of the loading bucket 4 relative to the mechanical arm 2, the milling roller hydraulic motor 9 is used for driving the milling roller 3 to rotate, an oil pump 10 is mounted in the oil tank 5, an oil supply main pipe 11 is connected to the oil supply main pipe 11, an oil supply pipe a12 and an oil supply pipe B13 are connected in parallel to the oil supply main pipe 11, the oil supply pipe a12 is communicated with an oil inlet of the boom cylinder 7, the oil supply pipe B13 is communicated with the oil inlet of the function switching valve 6, the function switching valve 6 is connected with a loading oil cylinder 8 and a rolling roller hydraulic motor 9 in parallel, an oil outlet of a movable arm oil cylinder 7 is further connected with an oil return pipe A14, an oil outlet of the function switching valve 6 is further connected with an oil return pipe B15, the oil return pipe A14 is connected with an oil return pipe B15 and then communicated with an oil tank 5 through an oil return main pipe 16, the oil supply main pipe 11 is communicated with the oil return main pipe 16 through an oil drain valve 17, the oil supply pipe A12 and the oil return pipe A14 are further connected together through an electromagnetic reversing valve A18, the oil supply pipe B13 and the oil return pipe B15 are further connected together through an electromagnetic reversing valve B19, a control end of the electromagnetic reversing valve A18 is connected with a signaling line A20, a control end of the electromagnetic reversing valve B19 is connected with a signaling line B21, a control end of the function switching valve 6 is connected with a signaling line C22, a control end of the oil drain valve 17 is connected with a signaling line D23, the signaling line D23 is respectively connected with a signaling line A20, a signaling line B21 and a signaling line C22 and then connected with a wheel type electric control system of the multipurpose engineering vehicle, diodes A24 are respectively arranged between the signaling line D23 and the signaling line A20, the signaling line B21 and the signaling line C22.
By adopting the technical scheme, the electric control system of the multipurpose wheel type engineering truck sends different command signals through a signaling line A20, a signaling line B21, a signaling line C22 or a signaling line D23, so that the running states of different hydraulic elements in corresponding oil circuit systems are changed, and the corresponding switching of the working modes of the wheel type engineering truck is realized, specifically, when the wheel type engineering truck is used as a loader, a movable arm oil cylinder and a loading oil cylinder are used as corresponding executing elements, the movable arm oil cylinder 7 is used for driving the mechanical arm 2 to ascend or descend, the loading oil cylinder 8 is used for adjusting the posture of a loading bucket 4 relative to the mechanical arm 2, at the moment, a floating valve is closed, and a safety valve is opened; when the wheel type engineering truck is used as a road roller, a movable arm oil cylinder and a rolling roller hydraulic motor are used as corresponding executing elements, the movable arm oil cylinder 7 is used for driving the mechanical arm 2 to move up or down, the rolling roller hydraulic motor 9 is used for driving the rolling roller 3 to rotate, at the moment, the switching of the function mode is completed through the function switching valve, the oil pressure in an oil way system is adjusted through the oil drain valve 17 and the safety overflow valve 26, so that the loading bucket or the rolling roller works in a rated state, and the safety of a hydraulic control system is improved.
Further, an oil return filter 25 is connected to the oil return main pipe 16. The main oil supply pipe 11 is also communicated with the main oil return pipe 16 through a safety overflow valve 26. The oil supply pipe A12 is also connected with a safety valve 27, the safety valve 27 is arranged between the oil inlet of the boom cylinder 7 and the electromagnetic directional valve A18, and the signaling line A20 is also electrically connected with the control end of the safety valve 27 through a diode C31. A one-way valve 32 is also connected between the oil inlet of the rolling roller hydraulic motor 9 and the function switching valve 6.
The self-return switch 28 is connected to the signaling line a20 and the signaling line B21, and the signaling line C22 is electrically connected to the control terminal of the self-return switch 28. The signaling line C22 is further electrically connected to the signaling line B21 and the signaling line a20 through a diode B29, respectively.
Further, the oil supply pipe a12 and the oil return pipe a14 are also connected together through the float valve 30, and the float valve 30 is arranged in parallel with the electromagnetic directional valve a18, and the control end of the float valve 30 is electrically connected with the signaling line C22.
By adopting the technical scheme of the invention, the oil drain valve is connected between the oil supply main pipe and the oil return main pipe, when the wheel type engineering truck is applied to different working modes, the oil pressure of an oil way system required by a bucket-carrying hydraulic control system or a rolling roller hydraulic control system is different, the oil drain valve can release the overlarge pressure in the oil way system according to the requirement, thereby meeting the requirements of the wheel type engineering truck in different working modes, improving the safety and in addition, the safety overflow valve is connected between the oil supply main pipe and the oil return main pipe, and further ensures that the oil pressure of an oil way in a hydraulic control system corresponding to the wheel type engineering truck is in a rated working pressure condition, so that related hydraulic elements are prevented from being damaged.
Claims (8)
1. A hydraulic control system for a multipurpose wheeled work vehicle, characterized by: the multipurpose wheel type engineering truck comprises a truck body (1), a mechanical arm (2) is installed on the truck body (1), a detachable loading bucket (4) or a rolling roller (3) is installed at the tail end of the mechanical arm (2), the hydraulic control system comprises an oil tank (5), a function switching valve (6), a movable arm oil cylinder (7), a loading oil cylinder (8) and a rolling roller hydraulic motor (9), the movable arm oil cylinder (7) is used for driving the mechanical arm (2) to ascend or descend, the loading oil cylinder (8) is used for adjusting the posture of the loading bucket (4) relative to the mechanical arm (2), the rolling roller hydraulic motor (9) is used for driving the rolling roller (3) to rotate, an oil pump (10) is installed in the oil tank (5), an oil supply main pipe (11) is connected to the oil pump (10), and an oil supply pipe A (12) and an oil supply pipe B (13) are connected to the oil supply main pipe (11) in parallel, the oil supply device is characterized in that the oil supply pipe A (12) is communicated with an oil inlet of a movable arm oil cylinder (7), the oil supply pipe B (13) is communicated with an oil inlet of a function switching valve (6), the function switching valve (6) is connected with a loading oil cylinder (8) and a rolling roller hydraulic motor (9) in parallel, an oil outlet of the movable arm oil cylinder (7) is further connected with an oil return pipe A (14), an oil outlet of the function switching valve (6) is further connected with an oil return pipe B (15), the oil return pipe A (14) is connected with the oil return pipe B (15) and then communicated with the oil tank (5) through an oil return main pipe (16), the oil supply main pipe (11) is communicated with an oil return main pipe (16) through an oil drain valve (17), the oil supply pipe A (12) is further connected with the oil return pipe A (14) through an electromagnetic reversing valve A (18), and the oil supply pipe B (13) is further connected with the oil return pipe B (15) through an electromagnetic reversing valve B (19), the control end of the electromagnetic directional valve A (18) is connected with a signaling line A (20), the control end of the electromagnetic directional valve B (19) is connected with a signaling line B (21), the control end of the function switching valve (6) is connected with a signaling line C (22), the control end of the oil drain valve (17) is connected with a signaling line D (23), the signaling line D (23) is connected with the signaling line A (20), the signaling line B (21) and the signaling line C (22) respectively and then is connected with the multipurpose wheeled engineering truck electrical control system, and diodes A (24) are arranged between the signaling line D (23) and the signaling line A (20), between the signaling line B (21) and between the signaling line C (22).
2. The hydraulic control system for a utility wheeled work vehicle of claim 1, wherein: and the oil return main pipe (16) is also connected with an oil return filter (25).
3. The hydraulic control system for a utility wheeled work vehicle of claim 1, wherein: the main oil supply pipe (11) is also communicated with the main oil return pipe (16) through a safety overflow valve (26).
4. The hydraulic control system for a utility wheeled work vehicle of claim 1, wherein: the oil supply pipe A (12) is further connected with a safety valve (27), the safety valve (27) is arranged between the oil inlet of the movable arm oil cylinder (7) and the electromagnetic directional valve A (18), and the signaling line A (20) is further electrically connected with the control end of the safety valve (27) through a diode C (31).
5. The hydraulic control system for a utility wheeled work vehicle of claim 1, wherein: and a one-way valve (32) is also connected between the oil inlet of the rolling roller hydraulic motor (9) and the function switching valve (6).
6. The hydraulic control system for a utility wheeled work vehicle of claim 1, wherein: and the signaling line A (20) and the signaling line B (21) are also connected with a self-return switch (28), and the signaling line C (22) is also electrically connected with a control end of the self-return switch (28) respectively.
7. The hydraulic control system for a utility wheeled work vehicle of claim 4, wherein: the signaling line C (22) is also electrically connected with the signaling line B (21) and the signaling line A (20) through a diode B (29), respectively.
8. The hydraulic control system for a utility wheeled work vehicle of claim 1, wherein: the oil supply pipe A (12) and the oil return pipe A (14) are further connected together through a floating valve (30), the floating valve (30) and the electromagnetic directional valve A (18) are arranged in parallel, and the control end of the floating valve (30) is electrically connected with the signaling line C (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010573967.4A CN111749956B (en) | 2020-06-22 | 2020-06-22 | Hydraulic control system for multipurpose wheeled engineering vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010573967.4A CN111749956B (en) | 2020-06-22 | 2020-06-22 | Hydraulic control system for multipurpose wheeled engineering vehicle |
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| Publication Number | Publication Date |
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| CN111749956A CN111749956A (en) | 2020-10-09 |
| CN111749956B true CN111749956B (en) | 2022-03-22 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2721383B2 (en) * | 1989-02-13 | 1998-03-04 | 日立建機株式会社 | Hydraulic circuit of work machine |
| CN201300829Y (en) * | 2008-11-13 | 2009-09-02 | 贵州詹阳动力重工有限公司 | Hydraulic braking system for wheel type hydraulic excavator |
| CN202441256U (en) * | 2012-02-15 | 2012-09-19 | 湖南五新重型装备有限公司 | Motion interlock system for horizontal orientation drilling rig |
| CN203543914U (en) * | 2013-11-18 | 2014-04-16 | 长沙中联消防机械有限公司 | Supporting leg control hydraulic system and engineering vehicle |
| CN106836337B (en) * | 2017-03-30 | 2022-09-20 | 徐州徐工筑路机械有限公司 | Land leveler variable hydraulic system |
| CN110566522A (en) * | 2019-09-06 | 2019-12-13 | 湖南星邦重工有限公司 | Active floating control system for underframe and aerial work platform thereof |
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