CN113803306B - Paddy field operation vehicle - Google Patents

Paddy field operation vehicle Download PDF

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Publication number
CN113803306B
CN113803306B CN202111015834.6A CN202111015834A CN113803306B CN 113803306 B CN113803306 B CN 113803306B CN 202111015834 A CN202111015834 A CN 202111015834A CN 113803306 B CN113803306 B CN 113803306B
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CN
China
Prior art keywords
valve
paddy field
pipeline
branch
way valve
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Active
Application number
CN202111015834.6A
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Chinese (zh)
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CN113803306A (en
Inventor
王磊
薛彦强
黄洁
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Changzhou Changfa Heavy Industry Technology Co ltd
Original Assignee
Changzhou Changfa Heavy Industry Technology Co ltd
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Priority to CN202111015834.6A priority Critical patent/CN113803306B/en
Publication of CN113803306A publication Critical patent/CN113803306A/en
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Classifications

    • 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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C11/00—Transplanting machines
    • A01C11/006—Other parts or details or planting machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4008—Control of circuit pressure
    • F16H61/4017—Control of high pressure, e.g. avoiding excess pressure by a relief valve

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)

Abstract

The present application provides a paddy field working vehicle, comprising: a gear box for storing hydraulic oil; the oil pump is communicated with the gear box; the steering booster is communicated with the oil pump through a first pipeline; the lifting controller comprises a lifting control valve which is communicated with the steering booster; the speed changing device is communicated with the lifting control valve through a second pipeline and is communicated with the gear box; the first safety valve comprises a valve core and a shell, and the valve core is connected between the first pipeline and the second pipeline in parallel; the speed change device is arranged on one side of the gear box, and the oil pump and the first safety valve are arranged on the other side of the gear box. According to the application, the first safety valve of the hydraulic system is arranged, so that the operation of the operation vehicle in severe environments such as deep mud feet and the like is protected, and the overpressure of the system caused by misoperation of a series hydraulic circuit protected by a mechanical structure is avoided.

Description

Paddy field operation vehicle
Technical Field
The application relates to a paddy field operation vehicle, in particular to a paddy field operation vehicle with a safety valve.
Background
In the prior art, when the transplanter operates under severe environments such as deep mud feet or mechanical structural faults to enable the pressure relief valve inside the steering booster and the lifting control valve to be in an open state, the pressure lost by a pipeline is added, the system pressure can be excessively high after long-time operation, the rated pressure of an oil pump is exceeded, and the oil pump can be damaged. In the industry, the overpressure of the hydraulic system is not protected by a protection device of the hydraulic system, but only by a mechanical structure, so that the overpressure of the machine tool can occur under the limit working condition of mechanical structure failure or misoperation of a user. Accordingly, there is a need for a paddy field work vehicle with a safety valve that overcomes the above-described drawbacks.
Disclosure of Invention
The application aims to provide a paddy field operation vehicle with a safety valve.
According to one aspect of the present application, there is provided a paddy field work vehicle comprising:
a gear box for storing hydraulic oil;
the oil pump is communicated with the gear box;
the steering booster is communicated with the oil pump through a first pipeline;
the lifting controller comprises a lifting control valve which is communicated with the steering booster;
the speed changing device is communicated with the lifting control valve through a second pipeline and is communicated with the gear box;
the first safety valve comprises a valve core and a shell, and the valve core is connected between the first pipeline and the second pipeline in parallel;
the speed change device is arranged on one side of the gear box, and the oil pump and the first safety valve are arranged on the other side of the gear box.
Preferably, the housing is provided as part of a first line, the first line further comprising a first hard tube connecting the oil pump and the housing and a second hard tube connecting the housing and the steering booster, the first hard tube and the second hard tube fixing the first relief valve.
Preferably, with the direction of implement travel as the place ahead, the oil pump is fixed on the right side of gear box, first relief valve establishes on the right side of oil pump, first hard tube is from oil pump bending and connection after extending to the right the casing, the second hard tube is from the casing towards bending and connection steering booster behind extending the direction of steering booster, paddy field operation car still includes the front axle, first relief valve is located between steering booster and the front axle.
Preferably, the lifting controller further comprises a lifting oil cylinder, the lifting oil cylinder comprises a rod cavity and a rodless cavity, and the lifting control valve comprises a first oil port for feeding oil from the steering booster, a second oil port communicated with the rod cavity and a third oil port communicated with the second pipeline.
Preferably, the second pipeline comprises a four-way valve, a first branch connected with a third oil port and the four-way valve, and a second branch connected with the four-way valve and the speed changing device, the first safety valve is connected with the four-way valve through the third branch, and the rodless cavity of the lifting oil cylinder is connected with the four-way valve through the fourth branch.
Preferably, the four-way valve further comprises a frame, the frame comprises a first longitudinal beam arranged along the front-back direction of the machine body, the first longitudinal beam is provided with a first fixing part for fixing the four-way valve, the frame further comprises a second longitudinal beam which is parallel to the first longitudinal beam and is arranged above the first longitudinal beam, the second longitudinal beam is provided with a second fixing part for fixing the lifting control valve, and the lifting control valve is positioned above the four-way valve.
Preferably, the steering booster and the lifting control valve are connected through a third pipeline, the paddy field working vehicle further comprises a pedal bracket, the pedal bracket is fixed on the first longitudinal beam, the third pipeline passes through the lower side of the pedal bracket, and the third pipeline is arranged on the outer side of the first longitudinal beam in the width direction of the frame.
Preferably, the third pipeline is a hard pipe, the third branch is a hose, the third branch is fixed to the third pipeline, the third branch passes below the pedal bracket, and the third branch is arranged on the outer side of the first longitudinal beam in the width direction of the frame.
Preferably, the second pipeline comprises a three-way valve, a fifth branch connecting the third oil port and the three-way valve and a sixth branch connecting the three-way valve and the speed changing device, and the first safety valve and the three-way valve are communicated through a seventh branch.
Preferably, the lifting control valve further comprises a fourth oil port connected with the rodless cavity of the lifting oil cylinder, and the fourth oil port is communicated with the third oil port.
Compared with the prior art, the paddy field working vehicle provided by the application has the following beneficial effects:
and a safety valve of the system is arranged, so that the pressure is unloaded through the safety valve under the condition of overhigh system pressure, and the oil pump is protected. The operation vehicle is protected to operate in severe environments such as deep mud feet. Under the condition that the pressure relief valve in the steering booster and the lifting control valve is in an open state, the system overpressure caused by pressure superposition of the pressure relief valve and pipeline loss caused by misoperation in a series hydraulic circuit protected by a mechanical structure is avoided. The pipeline arrangement is convenient and simple, and the cost is saved.
Drawings
The application is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a partial perspective view of a paddy field work vehicle of the present application;
FIG. 2 is a partial plan view of the paddy field work vehicle of the present application;
FIG. 3 is a top view of a portion of the assembly of the paddy field work vehicle of the present application;
FIG. 4 is a partial side view of the paddy field work vehicle of the present application;
FIG. 5 is a side view of a portion of the assembly of the paddy field work vehicle of the present application;
FIG. 6 is a perspective view of a portion of the assembly of the paddy field work vehicle of the present application;
FIG. 7 is a partial perspective view of the paddy field work vehicle of the present application from another perspective;
FIG. 8 is a schematic diagram of a hydraulic system of the paddy field work vehicle of the present application;
fig. 9 is a schematic diagram of another embodiment of the hydraulic system of the paddy field working vehicle of the present application.
Detailed Description
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
For the sake of simplicity of the drawing, the parts relevant to the present application are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will explain the specific embodiments of the present application with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the application, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Referring to fig. 1, the paddy field working vehicle 100 provided by the application comprises a gear box 1, an oil pump 2, a steering booster 3, a lifting controller 4, a speed changing device 5, a first safety valve 6, a four-way valve 7, a frame 8 and a front axle 9. The gear box 1 also serves as a hydraulic oil tank for storing hydraulic oil, the oil pump 2 is arranged on one side of the gear box 1 for pumping the hydraulic oil out of the gear box 1, and the oil filter 11 is fixed on the gear box 1 for filtering the hydraulic oil.
Referring to fig. 2 and 4, the direction of travel of the implement is referred to as the front. The transmission 5 is mounted on the left side of the gear case 1, and the oil pump 2 is mounted on the right side of the gear case 1. The first relief valve 6 is provided on the right side of the oil pump 2. The oil filter 11 is fixed to the right side of the gear case 1 and is located below the oil pump 2. The steering booster 3 is provided at the upper end of the gear box 1, and the first relief valve 6 is located between the steering booster 3 and the front axle 9 in the vertical direction. The embodiment has the beneficial effects that the first safety valve 6 is arranged on the right side of the oil pump 2, the pipeline is convenient and concise to arrange, the cost is saved, and in other embodiments, the first safety valve 6 can be optionally arranged at other positions.
Referring to fig. 3 and 5, a first pipe 21 connects the oil pump 2 and the steering booster 3. The first pipe 21 includes a first hard pipe 211, the housing 62 of the first relief valve 6, and a second hard pipe 212. The first hard tube 211 extends rightward from the oil pump 2 and then bends the connection housing 62 forward. The first relief valve 6 is located in front of the oil pump 2. The second rigid pipe 212 is bent from the housing 62 toward the gear chamber 1, extends obliquely upward, and is then bent and connected to the steering booster 3.
The first hard tube 211 and the second hard tube 212 simultaneously play a role in fixing the first safety valve 6, reduce vibration during operation and avoid damage. The shell 62 of the first safety valve 6 has the effect of protecting the valve core 61, and also serves as a part of an oil passage of the first pipeline 21, so that the pipeline is simplified, and the assembly is convenient. In the case where the system pressure does not exceed the set pressure value, the oil passes through the inside of the housing 62 and does not pass through the valve element 61.
Referring to fig. 6 and 7, the frame 8 includes a first side member 81 disposed in the front-rear direction of the implement, a step bracket 82 fixed to the first side member 81 and extending to the right of the implement perpendicularly to the first side member 81, and a second side member 83 parallel to the first side member 81 and disposed above the first side member 81.
The elevation controller 4 includes an elevation control valve 41. The third pipe 31 connects the steering booster 3 and the lift control valve 41. The third pipe 31 includes a first section 311 extending obliquely downward from the steering booster 3 to above the first relief valve 6, a second section 312 bent from the first section 311 and extending toward the rear of the implement, a third section 313 extending obliquely upward from the second section 312, and a fourth section 314 extending vertically upward from the third section 313 and connected to the lift control valve 41. The second section 312 passes below the pedal bracket 83, and the second section 312 and the third section 313 are located outside the first side member 81 in the implement width direction.
The first longitudinal beam 81 is provided with a first fixing portion 811 for fixing the four-way valve 7, and in this embodiment, the first fixing portion 811 is a mounting plate welded to an upper end face of the first longitudinal beam 81, and the four-way valve 7 is fixed to the mounting plate by bolting. The second side member 83 is provided with a second fixing portion 831 for fixing the elevation control valve 41, the second fixing portion 831 extends vertically with a "U" as a cross section and an upper end portion is fixed to the second side member 83 by welding. The elevation control valve 41 is provided above the four-way valve 7. The four-way valve 7 and the lifting control valve 41 are respectively positioned at the left and right sides of the vertical plane where the second longitudinal beam 83 is positioned.
Referring to fig. 2, the four-way valve 7 is connected to the lift control valve 41 through a first branch 71, the four-way valve 7 is connected to the transmission 5 through a second branch 72, the four-way valve 7 is connected to the first relief valve 6 through a third branch 73, and the four-way valve 7 is connected to the lift cylinder 42 through a fourth branch 74.
Referring to fig. 4, a third branch 73 extends rearward from the first relief valve 6 and connects to the four-way valve 7. In this embodiment, the third branch 73 is a hose. The third branch 73 is fixed to the third pipe 31 by means of a pipe clamp, the third branch 73 and the third pipe 31 being arranged partially side by side. The third branch 73 passes under the pedal bracket 82 and is located outside the first side member 81 in the implement width direction. The second branch 72 is located inside the frame 8.
Referring to fig. 8, the elevation control valve 41 includes a first oil port 411, a second oil port 412, and a third oil port 413. The lift cylinder 42 includes a rod chamber 421 and a rodless chamber 422. The steering booster 3 is connected to the first oil port 411 through the third pipe 31, and the second oil port 412 is connected to the rod chamber 421.
The lift control valve 41 is connected to the transmission 5 via a second pipe 51, and the transmission 5 communicates with the gear box 1. The second pipe 51 includes a four-way valve 7, a first branch 71 connecting the third port 413 and the four-way valve 7, and a second branch 72 connecting the four-way valve 7 and the transmission 5. The rodless chamber 422 of the lift cylinder 42 is connected to the four-way valve 7 by a fourth branch 74. The transmission 5 is a hydrostatic continuously variable transmission (HST).
The first relief valve 6 includes a valve element 61 and a housing 62, and the valve element 61 is connected in parallel between the first pipe 21 and the second pipe 51. When the pressure of the hydraulic system exceeds a set value, the hydraulic oil is released from the third branch 73 through the valve core 61 of the first relief valve 6, and the set value is smaller than the limit pressure of the oil pump, so that the technical effect of protecting the oil pump is achieved. When the pressure value of the hydraulic system is smaller than the set value, and the first safety valve 6 does not work, hydraulic oil enters the steering booster 3 after passing through the housing 62.
The steering booster 3 is provided with a first relief valve 32, and the lifting control valve 41 is provided with a second relief valve 43. During normal field operation, the steering booster 3 and the lifting controller 4 work normally, and the pressures of the first relief valve 32 and the second relief valve 43 do not reach the opening pressure, so that the system pressure of the hydraulic system is kept below the set pressure of the first relief valve 6, and the first relief valve 6 is not opened.
When the deep mud foot load in the field is large and steering is performed, the first pressure release valve 32 of the steering booster 3 is in an open state, the lifting control valve 41 is still in a lifting state due to mechanical structure failure or manual misoperation of the handle after the rear suspension is lifted to the highest point, the second pressure release valve 43 of the lifting control valve 41 is in an open state, the lost pressure of the hydraulic system at the moment can be caused by the lost pressure of the hydraulic system, and the damage of the oil pump 2 can be caused by the fact that the hydraulic system pressure exceeds the rated pressure of the oil pump 2 at the moment.
A first relief valve 6 is designed in the circuit and is arranged behind the oil outlet of the oil pump 2, and an oil return circuit is arranged in front of the hydrostatic stepless speed change device. After the hydraulic system reaches the set pressure of the first safety valve 6 due to the above reasons, hydraulic oil leaks all the way from the first safety valve 6, so that the system pressure does not exceed the rated pressure of the oil pump 2, and the oil pump 2 is effectively protected. After hydraulic oil is discharged and reaches the hydrostatic stepless speed change device, the whole vehicle can be guaranteed to advance in the limit state.
The lifting control valve 41 further comprises a reversing valve 44, wherein the reversing valve 44 is a five-position four-way valve, and the reversing valve is sequentially arranged from left to right in the figure: a first falling bit, a second falling bit, a hover bit, a first rising bit, and a second rising bit. The first descending position is full-speed descending, and the second descending position is provided with a throttle valve for controlling the descending speed to be retarded descending. The first rising position is provided with a throttle valve to control the rising speed to be slowly rising, and the second rising position is full-speed rising.
Referring to fig. 9, another embodiment of a hydraulic system of a paddy field working vehicle is provided. The lift control valve 41' further includes a fourth oil port 414. The fourth port 414 is connected to the rodless chamber 422 of the lift cylinder 42. The second conduit 51 'of the present embodiment includes a three-way valve 7b, a fifth branch 75 connecting the third port 413' and the three-way valve 7b, and a sixth branch 76 connecting the three-way valve 7b and the transmission 5. The first relief valve 6 and the three-way valve 7b are connected by a seventh branch 77.
It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present application without departing from the spirit and scope of the application. Therefore, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims (9)

1. A paddy field work vehicle, comprising:
a gear box for storing hydraulic oil;
the oil pump is communicated with the gear box;
the steering booster is communicated with the oil pump through a first pipeline;
the lifting controller comprises a lifting control valve which is communicated with the steering booster;
the speed changing device is communicated with the lifting control valve through a second pipeline and is communicated with the gear box;
the first safety valve comprises a valve core and a shell, and the valve core is connected between the first pipeline and the second pipeline in parallel;
the speed change device is arranged on one side of the gear box, and the oil pump and the first safety valve are arranged on the other side of the gear box;
the first pipeline further comprises a first hard pipe connected with the oil pump and the shell and a second hard pipe connected with the shell and the steering booster;
the direction that takes the machines to advance is the place ahead as the reference, the oil pump is fixed on the right side of gear box, first relief valve is established on the right side of oil pump, first hard tube is from oil pump bending and connect after extending to the right the casing, the second hard tube is from the casing towards bending and connect steering booster after extending the direction of steering booster, paddy field operation car still includes the front axle, first relief valve is located between steering booster and the front axle.
2. A paddy field work vehicle according to claim 1, wherein the housing is provided as part of a first pipeline, and the first and second rigid pipes secure the first relief valve.
3. The paddy field work vehicle of claim 1, wherein the lift controller further comprises a lift cylinder including a rod chamber and a rodless chamber, and the lift control valve includes a first port for feeding oil from the steering booster, a second port in communication with the rod chamber, and a third port in communication with the second conduit.
4. A paddy field work vehicle as defined in claim 3, wherein the second pipeline comprises a four-way valve, a first branch connecting the third oil port and the four-way valve, and a second branch connecting the four-way valve and the speed change device, the first relief valve and the four-way valve are connected by the third branch, and the rodless cavity of the lift cylinder and the four-way valve are connected by the fourth branch.
5. The paddy field work vehicle of claim 4, further comprising a frame including a first longitudinal beam provided in a front-rear direction of the machine body, the first longitudinal beam being provided with a first fixing portion for fixing the four-way valve, the frame further including a second longitudinal beam parallel to the first longitudinal beam and provided above the first longitudinal beam, the second longitudinal beam being provided with a second fixing portion for fixing the lift control valve, the lift control valve being located above the four-way valve.
6. The paddy field work vehicle according to claim 5, wherein the steering booster and the lift control valve are connected by a third pipe, the paddy field work vehicle further comprises a pedal bracket fixed to the first side member, the third pipe passes below the pedal bracket, and the third pipe is provided outside the first side member in the frame width direction.
7. The paddy field work vehicle of claim 6, wherein the third pipe is a hard pipe, the third branch is a hose, the third branch is fixed to the third pipe, the third branch passes under the pedal bracket, and the third branch is provided outside the first longitudinal beam in the frame width direction.
8. A paddy field work vehicle according to claim 3, wherein the second pipeline comprises a three-way valve, a fifth branch connecting the third port and the three-way valve, and a sixth branch connecting the three-way valve and the speed change device, and the first relief valve and the three-way valve are communicated through a seventh branch.
9. The paddy field work vehicle of claim 8, wherein the lift control valve further comprises a fourth port connected to the rodless cavity of the lift cylinder, the fourth port communicating with the third port.
CN202111015834.6A 2021-08-31 2021-08-31 Paddy field operation vehicle Active CN113803306B (en)

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Application Number Priority Date Filing Date Title
CN202111015834.6A CN113803306B (en) 2021-08-31 2021-08-31 Paddy field operation vehicle

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Application Number Priority Date Filing Date Title
CN202111015834.6A CN113803306B (en) 2021-08-31 2021-08-31 Paddy field operation vehicle

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CN113803306A CN113803306A (en) 2021-12-17
CN113803306B true CN113803306B (en) 2023-11-17

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CN203226043U (en) * 2012-12-19 2013-10-09 张林德 Hydraulic device for controlling transmission system of self-propelled cotton picker
CN205371121U (en) * 2016-02-03 2016-07-06 徐州徐工挖掘机械有限公司 Lift hydraulic circuit
CN105883691A (en) * 2016-06-28 2016-08-24 安徽合力股份有限公司 Forklift hydraulic system with hydraulic power-assisted brake
CN106640854A (en) * 2015-10-28 2017-05-10 中国国际海运集装箱(集团)股份有限公司 Two-way driving ferry bus hydraulic system
CN107489667A (en) * 2016-11-07 2017-12-19 河南农业大学 Caterpillar band type field working car fluid power system
CN108502816A (en) * 2018-05-08 2018-09-07 安徽合力股份有限公司 Bypass type energy regeneration forklift hydraulic system
CN208454429U (en) * 2018-05-08 2019-02-01 安徽合力股份有限公司 Bypass type energy regeneration forklift hydraulic system
CN110685967A (en) * 2019-09-20 2020-01-14 农业农村部南京农业机械化研究所 Full hydraulic drive high-speed transplanter chassis
KR102199865B1 (en) * 2019-10-25 2021-01-08 현대트랜시스 주식회사 Device of controlling hydraulic for idel stop and go

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1278494A (en) * 2000-08-08 2001-01-03 李世六 Fully-hydraulic automobile driving and controlling system
CN203226043U (en) * 2012-12-19 2013-10-09 张林德 Hydraulic device for controlling transmission system of self-propelled cotton picker
CN106640854A (en) * 2015-10-28 2017-05-10 中国国际海运集装箱(集团)股份有限公司 Two-way driving ferry bus hydraulic system
CN205371121U (en) * 2016-02-03 2016-07-06 徐州徐工挖掘机械有限公司 Lift hydraulic circuit
CN105883691A (en) * 2016-06-28 2016-08-24 安徽合力股份有限公司 Forklift hydraulic system with hydraulic power-assisted brake
CN107489667A (en) * 2016-11-07 2017-12-19 河南农业大学 Caterpillar band type field working car fluid power system
CN108502816A (en) * 2018-05-08 2018-09-07 安徽合力股份有限公司 Bypass type energy regeneration forklift hydraulic system
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