CN110130251B - Road sweeper travel system capable of switching high-speed mode and low-speed mode - Google Patents
Road sweeper travel system capable of switching high-speed mode and low-speed mode Download PDFInfo
- Publication number
- CN110130251B CN110130251B CN201910535252.7A CN201910535252A CN110130251B CN 110130251 B CN110130251 B CN 110130251B CN 201910535252 A CN201910535252 A CN 201910535252A CN 110130251 B CN110130251 B CN 110130251B
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- oil
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- supplementing
- oil supplementing
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- 241001417527 Pempheridae Species 0.000 title abstract description 12
- 230000001502 supplementing effect Effects 0.000 claims abstract description 67
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 239000003921 oil Substances 0.000 claims description 129
- 238000010408 sweeping Methods 0.000 claims description 16
- 239000010720 hydraulic oil Substances 0.000 claims description 12
- 238000013016 damping Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009194 climbing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
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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
- 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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
The invention relates to a road sweeper walking system capable of switching high-low speed modes, which comprises an engine and four driving wheels, wherein a hydraulic driving system is arranged between the engine and the driving wheels, and the engine drives the four driving wheels to rotate through the hydraulic driving system; the hydraulic driving system comprises an oil tank, a variable pump and four double-speed hydraulic motors, a closed system is formed between the variable pump and the four double-speed hydraulic motors, and the closed system is also connected with an oil supplementing system and a speed regulating system; the closed system comprises an oil suction pipeline, a first oil conveying pipeline and an oil discharging pipeline, the oil supplementing system comprises an oil supplementing pump, an oil supplementing one-way valve and an oil supplementing pipeline, and the speed regulating system comprises a pressure relay, a high-low speed switching electromagnetic valve, a speed regulating pipeline and a second output pipeline. The device has the advantages of simple structure, convenient control and capability of considering driving force and driving speed.
Description
Technical Field
The invention relates to the technical field of sweeping vehicles, in particular to a hydraulic driving system of a sweeping vehicle.
Background
The sweeping vehicle is an integrated garbage sweeping vehicle combining sweeping and dust collection, has the advantages of high working efficiency, low cleaning cost, good cleaning effect, high safety performance, high economic return rate and the like, and has been widely applied to sweeping work of roads in various large, medium and small cities.
At present, a domestic diesel-powered sweeping vehicle does not have a hydraulic four-wheel drive system which is suitable for bearing, a large-displacement hydraulic motor is required to be selected for driving in order to ensure the driving force of the sweeping vehicle, and the hydraulic driving system has driving force, but the driving speed of the whole sweeping vehicle is generally low, and generally only 15km/h is required. In order to ensure that the speed of the sweeping vehicle can only be driven by a motor with small displacement, the speed of the whole machine can be close to the speed of the sweeping vehicle made by the foreign advanced country, namely, the transition speed is about 30km/h, but the sweeping vehicle has poor climbing capacity generally, and is not good for the city in the domestic mountainous area, even the road tooth of the plain city can not go. In summary, there is no way to combine the driving force and the driving speed of the hydraulic driving system of the small diesel sweeper in the market at present.
Therefore, how to improve the existing hydraulic driving system of the sweeper to overcome the above problems is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide the road sweeper travel system capable of switching high-low speed modes, which has a simple structure and is convenient to control and capable of considering driving force and driving speed.
In order to achieve the above purpose, the invention adopts the following technical scheme: the sweeping vehicle running system capable of switching high-low speed modes comprises an engine and four driving wheels, wherein a hydraulic driving system is arranged between the engine and the driving wheels, and the engine drives the four driving wheels to rotate through the hydraulic driving system; the method is characterized in that:
the hydraulic driving system comprises an oil tank, a variable pump and four double-speed hydraulic motors, a closed system is formed between the variable pump and the four double-speed hydraulic motors, and the closed system is also connected with an oil supplementing system and a speed regulating system;
The closed system comprises an oil suction pipeline, a first oil conveying pipeline and an oil discharge pipeline, the oil supplementing system comprises an oil supplementing pump, an oil supplementing one-way valve and an oil supplementing pipeline, and the speed regulating system comprises a pressure relay, a high-low speed switching electromagnetic valve, a speed regulating pipeline and a second output pipeline;
The oil supplementing pump is connected with the variable pump in series, the oil absorbing pipeline is connected with the oil tank and the oil supplementing pump, the variable pump is connected with the first oil conveying pipeline, the oil supplementing pipeline is connected with the first oil conveying pipeline in parallel, two oil supplementing one-way valves are respectively arranged at two ends of the oil supplementing pipeline, and the oil supplementing one-way valves only allow hydraulic oil to enter the closed system from the oil supplementing pipeline; the first oil conveying pipeline is connected with one end of the double-speed hydraulic motor, the other end of the double-speed hydraulic motor is connected with the oil drain pipeline, and the oil drain pipeline is connected with the oil tank;
The pressure relay is connected to the first oil pipeline, the speed regulating pipeline is connected with the oil supplementing pipeline, the speed regulating pipeline is connected with one side of the high-low speed switching electromagnetic valve, the other side of the high-low speed switching electromagnetic valve is connected with the second oil pipeline, and the second oil pipeline is connected with one end of the double-speed hydraulic motor; and the high-low speed switching electromagnetic valve acts according to the pressure relay signal.
As an improvement, three safety valves are further arranged on the oil supplementing pipeline, and the three safety valves are respectively arranged at two ends of the oil supplementing one-way valve and between the two oil supplementing one-way valves.
Further, damping holes are further formed in two ends of one of the oil supplementing one-way valves.
As an improvement, the oil suction pipeline is provided with an oil suction filter, and the oil supplementing pipeline is provided with an oil supplementing filter. The filter makes the hydraulic oil entering the hydraulic system purer.
As an improvement, a compensation pipeline is further arranged between the two-speed hydraulic motor and the oil tank, a check valve is arranged on the compensation pipeline, and hydraulic oil is only allowed to enter the two-speed hydraulic motor from the oil tank. When the sweeper descends at a high speed, hydraulic oil in the closed system flows at a high speed, so that negative pressure can be formed in the system, and potential safety hazards exist; when negative pressure is formed in the closed system, the compensating pipeline is directly connected with the mailbox, hydraulic oil can be conveyed to the closed system by means of atmospheric pressure, so that pressure balance in the closed system is kept, and faults caused by negative pressure in the system are avoided.
Compared with the prior art, the invention has the advantages that:
1. The closed system can convey the mechanical energy of the engine to the driving wheels, hydraulic oil leaks in the closed system due to efficiency, and the oil supplementing system is used for supplementing oil to the closed system. In general, the oil supplementing flow is 1/3 of the working flow, the oil supplementing pressure is generally 15-25bar, the oil supplementing flow and the oil supplementing pressure are determined according to the driving characteristics of the whole machine and the efficiency of hydraulic parts, the driving of the sweeper is relatively stable, and the oil supplementing pressure is 15 bar. The two oil supplementing one-way valves are used for supplementing oil to the closed system, and the two oil supplementing one-way valves automatically work according to the pressure when the pressure on the side is low. The safety valve limits the whole pressure of the hydraulic system and plays a role in safety protection. The damping holes of 0.8 are used for well finding the position of the road sweeper in the parking process and for soft start of the backward travel.
2. It should be noted that, the control handle may change the inclination angle of the variable disc of the variable pump, that is, change the displacement and direction of the variable pump, thereby changing the output rotation speed and direction of the quantitative motor. Because the angle of the variable disc of the variable pump can be continuously adjusted, the output rotating speed of the driving motor is continuously changed, and the stepless speed change of the hydraulic driving system is further realized, so that the requirements of the sweeper on a running system under the complex working condition are met (the driving speed is required to be changed, but the rotating speed of the working fan cannot be changed).
3. The pressure relay and the high-low speed switching electromagnetic valve work cooperatively. When the oil pressure of the first oil conveying pipeline detected by the pressure relay is smaller than a preset value, the high-low speed switching electromagnetic valve controls the flow of hydraulic oil in the speed regulating pipeline, and the sweeper is in a high-speed low-power working mode; when the oil pressure of the first oil conveying pipeline detected by the pressure relay is larger than a preset value, the high-low speed switching electromagnetic valve adjusts the flow of hydraulic oil in the speed regulating pipeline, and the sweeper is in a low-speed high-power working mode. In summary, the hydraulic driving system can realize stepless adjustable driving speed by adding the speed regulating system, so that the driving motor can be switched at high and low speeds at any time, the oil consumption can be reduced, the cleaning efficiency can be improved, the labor intensity of workers can be reduced, and the hydraulic driving system is safe and reliable.
Drawings
Fig. 1 is a schematic diagram of the operation of a preferred embodiment according to the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
In the description of the present invention, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present invention that the device or element referred to must have a specific azimuth configuration and operation.
As shown in fig. 1, a preferred embodiment of the present invention includes an engine 100 and four driving wheels 200, a hydraulic drive system 300 is provided between the engine 100 and the driving wheels 200, and the engine 100 drives the four driving wheels 200 to rotate by the hydraulic drive system 300. The key point is that:
The hydraulic driving system 300 comprises an oil tank 1, a variable pump 2 and four double-speed hydraulic motors 3, a closed system 4 is formed between the variable pump 1 and the four double-speed hydraulic motors 3, and the closed system 4 is also connected with an oil supplementing system 5 and a speed regulating system 6. Specific:
The closed system 4 comprises an oil suction pipeline 41, a first oil conveying pipeline 42 and an oil drain pipeline 43, the oil supplementing system 5 comprises an oil supplementing pump 51, an oil supplementing one-way valve 52 and an oil supplementing pipeline 53, and the speed regulating system 6 comprises a pressure relay 61, a high-low speed switching electromagnetic valve 62, a speed regulating pipeline 63 and a second oil conveying pipeline 64.
The oil supplementing pump 51 is connected in series with the variable pump 2, the oil absorbing pipeline 41 is connected with the oil tank 1 and the oil supplementing pump 51, the variable pump 2 is connected with the first oil conveying pipeline 42, the oil supplementing pipeline 53 is connected in parallel with the first oil conveying pipeline 42, two oil supplementing one-way valves 52 are respectively arranged at two ends of the oil supplementing pipeline 53, and the oil supplementing one-way valves 52 only allow hydraulic oil to enter the closed system 4 from the oil supplementing pipeline 53; the first oil pipeline 42 is connected with one end of the double-speed hydraulic motor 3, the other end of the double-speed hydraulic motor 3 is connected with the oil drain pipeline 43, and the oil drain pipeline 43 is connected with the oil tank 1.
The pressure relay 61 is connected to the first oil pipeline, the speed regulating pipeline 63 is connected to the oil supplementing pipeline 53, the speed regulating pipeline 63 is connected to one side of the high-low speed switching electromagnetic valve 62, the other side of the high-low speed switching electromagnetic valve 62 is connected to the second oil pipeline 64, and the second oil pipeline 64 is connected to one end of the double-speed hydraulic motor 3; and the high-low speed switching solenoid valve 62 operates according to the pressure relay 61 information.
In addition, three safety valves 54 are further disposed on the oil compensating pipe 53, and the three safety valves 54 are disposed at two ends of the oil compensating check valve 52 and between the two oil compensating check valves 52, respectively. Two ends of one of the oil supplementing one-way valves 52 are also provided with damping holes 55. The oil suction line 41 is provided with an oil suction filter 44, and the oil replenishment line 53 is provided with an oil replenishment filter 56. A compensating line 7 is also provided between the two-speed hydraulic motor 3 and the tank 1, and a non-return valve 71 is provided on the compensating line 7, which non-return valve only allows hydraulic oil from the tank 1 to enter the two-speed hydraulic motor 3.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The sweeping vehicle running system capable of switching high-low speed modes comprises an engine and four driving wheels, wherein a hydraulic driving system is arranged between the engine and the driving wheels, and the engine drives the four driving wheels to rotate through the hydraulic driving system; the method is characterized in that:
the hydraulic driving system comprises an oil tank, a variable pump and four double-speed hydraulic motors, a closed system is formed between the variable pump and the four double-speed hydraulic motors, and the closed system is also connected with an oil supplementing system and a speed regulating system;
The closed system comprises an oil suction pipeline, a first oil conveying pipeline and an oil discharge pipeline, the oil supplementing system comprises an oil supplementing pump, an oil supplementing one-way valve and an oil supplementing pipeline, and the speed regulating system comprises a pressure relay, a high-low speed switching electromagnetic valve, a speed regulating pipeline and a second oil conveying pipeline;
The oil supplementing pump is connected with the variable pump in series, the oil absorbing pipeline is connected with the oil tank and the oil supplementing pump, the variable pump is connected with the first oil conveying pipeline, the oil supplementing pipeline is connected with the first oil conveying pipeline in parallel, two oil supplementing one-way valves are respectively arranged at two ends of the oil supplementing pipeline, and the oil supplementing one-way valves only allow hydraulic oil to enter the closed system from the oil supplementing pipeline; the first oil conveying pipeline is connected with one end of the double-speed hydraulic motor, the other end of the double-speed hydraulic motor is connected with the oil drain pipeline, and the oil drain pipeline is connected with the oil tank;
The pressure relay is connected to the first oil pipeline, the speed regulating pipeline is connected with the oil supplementing pipeline, the speed regulating pipeline is connected with one side of the high-low speed switching electromagnetic valve, the other side of the high-low speed switching electromagnetic valve is connected with the second oil pipeline, and the second oil pipeline is connected with one end of the double-speed hydraulic motor; the high-low speed switching electromagnetic valve acts according to the pressure relay signal;
Three safety valves are further arranged on the oil supplementing pipeline, and the three safety valves are respectively arranged at two ends of the oil supplementing one-way valve and between the two oil supplementing one-way valves;
The oil suction pipeline is provided with an oil suction filter, and the oil supplementing pipeline is provided with an oil supplementing filter.
2. The floor sweeping vehicle travel system capable of switching between high and low speed modes according to claim 1, wherein: and damping holes are also formed at two ends of one of the oil supplementing one-way valves.
3. The floor sweeping vehicle travel system capable of switching between high and low speed modes according to claim 1, wherein: and a compensation pipeline is further arranged between the double-speed hydraulic motor and the oil tank, a check valve is arranged on the compensation pipeline, and the check valve only allows hydraulic oil to enter the double-speed hydraulic motor from the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535252.7A CN110130251B (en) | 2019-06-20 | 2019-06-20 | Road sweeper travel system capable of switching high-speed mode and low-speed mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535252.7A CN110130251B (en) | 2019-06-20 | 2019-06-20 | Road sweeper travel system capable of switching high-speed mode and low-speed mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110130251A CN110130251A (en) | 2019-08-16 |
| CN110130251B true CN110130251B (en) | 2024-07-26 |
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| CN201910535252.7A Active CN110130251B (en) | 2019-06-20 | 2019-06-20 | Road sweeper travel system capable of switching high-speed mode and low-speed mode |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709730B (en) * | 2021-01-06 | 2023-06-23 | 武汉船用机械有限责任公司 | Closed hydraulic control system of slewing mechanism and application method thereof |
| CN115788991A (en) * | 2022-11-28 | 2023-03-14 | 徐州徐工环境技术有限公司 | A deep cleaning vehicle control system with high and low speed switching function |
| CN117167353B (en) * | 2023-09-27 | 2024-04-09 | 徐工集团工程机械股份有限公司科技分公司 | Double-speed closed hydraulic traveling system and method for skid steer loader |
| CN118640197A (en) * | 2024-08-19 | 2024-09-13 | 四川蓝海智能装备制造有限公司 | A closed hydraulic travel system control device and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210561903U (en) * | 2019-06-20 | 2020-05-19 | 宁波易捷环卫设备有限公司 | Sweeper traveling system capable of switching high-speed mode and low-speed mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19602196A1 (en) * | 1996-01-23 | 1997-07-24 | Danfoss As | Hydraulic drive system for cross-country farm vehicle |
| DE10238614A1 (en) * | 2002-08-17 | 2004-02-26 | Claas Selbstfahrende Erntemaschinen Gmbh | Oil volume compensation in the oil circuit of the hydraulic drive of a self-propelled machine |
| CN201416161Y (en) * | 2009-05-12 | 2010-03-03 | 湖南恒润高科有限公司 | Hydraulic control device of road sweeper |
| CN204878092U (en) * | 2015-06-09 | 2015-12-16 | 聂勤 | Closed hydraulic power control system |
| CN108425899A (en) * | 2018-05-15 | 2018-08-21 | 山推工程机械股份有限公司 | A kind of hydraulic system of bulldozer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210561903U (en) * | 2019-06-20 | 2020-05-19 | 宁波易捷环卫设备有限公司 | Sweeper traveling system capable of switching high-speed mode and low-speed mode |
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