CN110864017A - Hydraulic control system and snow melting vehicle - Google Patents
Hydraulic control system and snow melting vehicle Download PDFInfo
- Publication number
- CN110864017A CN110864017A CN201810981956.2A CN201810981956A CN110864017A CN 110864017 A CN110864017 A CN 110864017A CN 201810981956 A CN201810981956 A CN 201810981956A CN 110864017 A CN110864017 A CN 110864017A
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- Prior art keywords
- control system
- oil
- valve
- hydraulic control
- proportional flow
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- 238000002844 melting Methods 0.000 title claims abstract description 60
- 230000008018 melting Effects 0.000 title claims abstract description 55
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 103
- 239000010865 sewage Substances 0.000 description 20
- 238000005096 rolling process Methods 0.000 description 17
- 239000010720 hydraulic oil Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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
- F15B11/16—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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a hydraulic control system and a snow melting vehicle. The hydraulic control system comprises more than two load units, a hydraulic pump and electromagnetic valves, wherein the hydraulic pump is used for driving the load units to act, the electromagnetic valves are respectively used for controlling the action of each load unit, the load units are arranged in parallel, the hydraulic control system further comprises an electric proportional flow valve, an oil inlet of the electric proportional flow valve is connected with an outlet of the hydraulic pump, an oil outlet of the electric proportional flow valve is connected with an oil inlet of the electromagnetic valve for controlling the load units, an oil return port of the electric proportional flow valve is connected with an oil tank, and the hydraulic control system further comprises a control unit connected with the electromagnetic valves and electromagnets of the electric proportional flow valve; the snow melting vehicle comprises a vehicle body and the hydraulic control system. The hydraulic control system has simple pipeline, and when the hydraulic control system is applied to the snow melting vehicle, the production cost is reduced, and the heating and power loss of the hydraulic control system of the snow melting vehicle are effectively reduced.
Description
Technical Field
The invention relates to the field of snow melting vehicles and control systems thereof, in particular to a hydraulic control system and a snow melting vehicle.
Background
The snow and rain weather in winter in the north is more and the duration is long, and after snowing, the road can be covered with snow, and in order to clean the snow on the road surface, the road is ensured to be smooth, and the snow melting vehicle can be more and more widely applied. The main functional actions of the existing snow melting vehicle include lifting of a snow melting cover, lifting of a suction device, rotation of a snow melting rolling brush, rotation of a suction rolling brush, opening and closing of a sewage outlet and the like, and the actions are completed through a hydraulic control system. The snow melting cover and the suction device can be lifted to realize the contact or separation of the operation part and the snow, the rotation of the snow melting and suction rolling brushes can improve the snow melting effect, the requirements of the snow melting vehicle on the rotation speed of the two rolling brushes under different operation conditions are inconsistent, and the requirements of each load on the flow rate are inconsistent when different functions act.
At present, the method for processing the above situations is to adopt multiple pumps to perform individual control, that is, pressure oil is provided for the hydraulic actuator by the individual hydraulic pump, the pressure oil is filtered by a filter and flows through an oil inlet pipeline to the hydraulic actuator, so that the hydraulic actuator completes corresponding functional actions, and simultaneously redundant hydraulic oil is required to enter a hydraulic oil tank through an oil return pipeline. However, the treatment method of adopting multiple pumps for individual control leads the whole system to have more oil passages, complex pipelines and higher cost; when multiple pumps are adopted for independent control, some loads need to act simultaneously, and pumps of different loads need to be controlled to operate simultaneously, so that the heat of the system is increased, and the power loss of the system is caused.
Disclosure of Invention
The invention aims to provide a hydraulic control system, which solves the problems of complex pipeline of the hydraulic control system of a snow melting vehicle, high heat generation and power loss when the system performs different functional actions; the invention also aims to provide the snow melting vehicle applying the hydraulic control system.
In order to achieve the purpose, the technical scheme of the hydraulic control system provided by the invention is as follows: the utility model provides a hydraulic control system, includes more than two load cell, is used for the drive the hydraulic pump of load cell action still includes the solenoid valve that is used for controlling each load cell action respectively, parallelly connected setting between the load cell, hydraulic control system still includes electric proportional flow valve, and electric proportional flow valve's oil inlet links to each other with the export of hydraulic pump, and electric proportional flow valve's oil-out and control the oil inlet of load cell's solenoid valve links to each other, and electric proportional flow valve's oil return opening links to each other with the oil tank, hydraulic control system still includes the control unit that links to each other with solenoid valve and electric proportional flow valve's electro-magnet.
The hydraulic control system has the beneficial effects that: when the snow melting vehicle does not act, the output flow of the hydraulic pump passes through the priority oil port of the electric proportional flow valve, so that a very small load is overcome to unload the system; when a certain load unit acts, the control unit gives a set current to the electric proportional flow valve, the flow passing through the load port of the electric proportional flow valve enters the load unit (the redundant flow is unloaded through the priority oil port of the electric proportional flow valve), and different opening degrees of the throttling ports can be controlled according to the flow requirements of different load units. When different load units act, the current output by the control unit to the electric proportional flow valve is different in magnitude, and therefore heating and unnecessary power loss of the system are reduced.
Further, the number of hydraulic pumps is limited to one. The hydraulic pump is a single pump, and compared with a plurality of pumps for controlling the flow of the load independently, the hydraulic control system has the advantages that the pipeline is simplified, and the cost is saved.
The technical scheme of the snow melting vehicle is as follows: the utility model provides a snow melting vehicle, includes more than two load cell, is used for the drive the hydraulic pump of load cell action still includes the solenoid valve that is used for controlling each load cell action respectively, parallelly connected setting between the load cell, hydraulic control system still includes electric proportional flow valve, and electric proportional flow valve's oil inlet links to each other with the export of hydraulic pump, and electric proportional flow valve's oil-out and control the oil inlet of the solenoid valve of load cell links to each other, and electric proportional flow valve's oil return opening links to each other with the oil tank, hydraulic control system still includes the control unit that links to each other with solenoid valve and electric proportional flow valve's electro-magnet.
The snow melting vehicle has the beneficial effects that: the snow melting vehicle can meet different requirements on flow or rotating speed when each working load unit works in the snow melting vehicle, and can reduce heating and power loss of the snow melting vehicle.
Further, the number of hydraulic pumps is limited to one. The hydraulic pump is a single pump, and compared with the flow rate of a load which is independently controlled by a plurality of pumps, the hydraulic control system has simplified pipelines, the weight of the snow melting vehicle is reduced, and the manufacturing cost of the snow melting vehicle is saved.
Further, the load unit is limited to comprise a snow melting device lifting oil cylinder and a suction device lifting oil cylinder, and rodless cavities of the snow melting device lifting oil cylinder and the suction device lifting oil cylinder are communicated with the oil tank. The rodless cavities of the snow melting device lifting oil cylinder and the suction device lifting oil cylinder are communicated with the hydraulic oil tank, so that the snow melting device and the suction device can descend through respective gravity, and meanwhile, the rodless cavities of the two oil cylinders are communicated with the oil tank, so that the oil tank can supplement oil into the rodless cavities through the pipeline, and the descending of the two devices is promoted.
Drawings
FIG. 1 is a control schematic diagram of a hydraulic control system of a snow melting vehicle provided by the present invention;
FIG. 2 is a hydraulic schematic diagram of an electro-proportional flow valve according to the present invention;
in the figure: 1-hydraulic oil tank, 2-single gear pump, 3-filter, 4-pressure gauge, 5-main valve group, 6-electric proportional flow valve, 7-auxiliary valve group, 8-right fan motor, 9-left fan motor, 10-suction rolling brush motor, 11-snow melting rolling brush motor, 12-suction device lifting oil cylinder, 13-snow melting device lifting oil cylinder, 14-sewage discharge device oil cylinder, 15-sewage tank switch oil cylinder, 16-proportional throttle valve and 17-pressure compensation valve.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings, but the present invention is not limited thereto.
The specific embodiment of the hydraulic control system is shown in fig. 1, and the hydraulic control system includes a hydraulic oil tank 1, a single gear pump 2, a filter 3, a hydraulic actuator, a main oil inlet pipeline, a main oil return pipeline and a controller, where the controller can control the opening or closing of an electromagnetic valve in the hydraulic control system, one end of the single gear pump 2 is communicated with the hydraulic oil tank 1 through the filter 3, the other end of the single gear pump 2 is connected with the main oil inlet pipeline, and an electric proportional flow valve 6 (one type of proportional flow control valve) is connected in parallel between the main oil inlet pipeline and the main oil return pipeline. Electric proportional flow valve 6 is prior art, like the proportional flow control valve disclosed in the chinese utility model patent with the publication number CN206592353U, the oil inlet of this proportional flow control valve links to each other with hydraulic motor's oil inlet, and the oil-out of this proportional flow control valve links to each other with hydraulic motor's oil-out and connects back to the oil tank. As the electric proportional flow valve disclosed in the chinese utility model patent with the publication number CN207526817U, both ends of the electric proportional flow valve are respectively connected to the oil inlet and the oil tank of the hydraulic motor. In the present embodiment, the electro proportional flow valve 6 comprises two parts, namely a proportional throttle valve 16 and a pressure compensation valve 17, and as shown in fig. 2, the electromagnet of the electro proportional flow valve 6 is connected with a controller.
The electric proportional flow valve 6 comprises a proportional throttle valve 16 and a pressure compensating valve 17, and the pressure compensating valve 17 can compare the system pressure before the valve port of the proportional throttle valve 16 with the system pressure after the valve port, so that a fixed difference is always kept between the system pressure before the valve port of the proportional throttle valve 16 and the system pressure after the valve port, namely the pressure between the port T1 and the port T2 in FIG. 2 is a fixed value, and the fixed value is a spring force acting on a valve core of the pressure compensating valve 17. The electric proportional flow valve 6 is provided with a proportional throttle orifice, and the flow formula of the proportional throttle orifice is as follows:
wherein q isvFlow rate, A area of orifice, ρ density of fluid, CdIs the flow coefficient and Δ P is the pressure difference across the orifice. From the above formula, the flow through the electric proportional flow valve 6 is only proportional toThe opening size of the throttle orifice is related, that is, the electric proportional flow valve 6 can adjust the flow rate passing through the electric proportional flow valve 6 by adjusting the opening size of the proportional throttle orifice. An oil inlet T1 of the proportional throttle valve 16 is connected with an outlet of the single gear pump 2, and an oil outlet T2 of the proportional throttle valve 16 is connected with an oil inlet of the pressure compensation valve 17. An oil inlet bypass is further arranged at the oil inlet T1 of the proportional throttle valve 16, the pressure compensation valve 17 is provided with a priority oil port P1 corresponding to the pressure compensation valve, and the priority oil port P1 is communicated with the hydraulic oil tank 1. The working oil port P2 of the pressure compensation valve 17 is connected with the oil inlet of the electromagnetic valve for controlling the hydraulic actuator, and a pressure gauge 4 for detecting pressure is arranged between the working oil port P2 and the oil inlet of the electromagnetic valve. When the hydraulic actuating element in the system does not work, the output flow of the single gear pump 2 passes through the priority oil port P1 to overcome a small load, so that the system is unloaded.
The hydraulic actuating elements in the hydraulic control system comprise a sewage tank switch oil cylinder 15, a sewage discharge device oil cylinder 14, a snow melting device lifting oil cylinder 13, a suction device lifting oil cylinder 12, a right fan motor 8, a left fan motor 9, a suction rolling brush motor 10 and a snow melting rolling brush motor 11. Wherein the right fan motor 8, the left fan motor 9, the suction brush roller motor 10 and the snow-melting brush roller motor 11 together form a load unit. A main oil inlet pipeline is connected in parallel with a main valve group 5 for controlling the oil inlet and the oil outlet of a hydraulic cylinder behind an electric proportional flow valve 6, and the main valve group comprises a three-position four-way electromagnetic directional valve for controlling the oil inlet and the oil outlet of a sewage tank switch oil cylinder 15, a three-position four-way electromagnetic directional valve for controlling the oil inlet and the oil outlet of a sewage disposal device oil cylinder 14, a two-position three-way electromagnetic directional valve for controlling the oil inlet and the oil outlet of a suction device lifting oil cylinder 12, a two-position three-way electromagnetic directional valve for controlling the oil inlet and the oil outlet of a snow melting device lifting oil cylinder 13 and a two-position three. A balance valve is arranged between the sewage tank switch oil cylinder 15 and the three-position four-way electromagnetic directional valve for controlling the action of the sewage tank switch oil cylinder, a bidirectional hydraulic lock is used for locking between the sewage draining device oil cylinder 14 and the three-position four-way electromagnetic directional valve for controlling the action of the sewage draining device oil cylinder, and a one-way valve is used for locking between the suction device lifting oil cylinder 12 and the snow melting device lifting oil cylinder 13 and the two-position three-way electromagnetic directional valve for controlling the action of the snow melting device lifting oil cylinder. The motor load unit composed of the right fan motor 8, the left fan motor 9, the suction rolling brush motor 10 and the snow melting rolling brush motor 11 is in control connection through an auxiliary valve group 7, and the auxiliary valve group 7 comprises three-position four-way electromagnetic reversing valves which respectively control the right fan motor 8, the left fan motor 9, the suction rolling brush motor 10 and the snow melting rolling brush motor 11 to rotate. One two-position three-way electromagnetic reversing valve arranged on the main valve group 5 is communicated with the auxiliary valve group 7 through a one-way valve. The three-position four-way electromagnetic directional valves have M-shaped neutral functions, working oil ports of the three-position four-way electromagnetic directional valves in the auxiliary valve group 7 are respectively communicated with oil inlet and outlet ports of the right fan motor 8, the left fan motor 9, the suction rolling brush motor 10 and the snow melting rolling brush motor 11, when the three-position four-way electromagnetic directional valves are in neutral, oil inlet and outlet ports of two adjacent three-position four-way electromagnetic directional valves are communicated, and the working oil ports are closed.
The right fan motor 8, the left fan motor 9, the suction rolling brush motor 10, and the snow-melting rolling brush motor 11 are all provided with oil drain ports for independent oil return. Rodless cavities of the suction device lifting oil cylinder 12 and the snow melting device lifting oil cylinder 13 are communicated with oil outlets of a three-position four-way electromagnetic directional valve for controlling oil inlet and outlet of the suction rolling brush motor 10, and are finally communicated with an oil supplementing pipeline of the system. The electromagnets of the three-position four-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve are connected with the controller.
The working process of the hydraulic control system is as follows: the output flow of the single gear pump 2 enters the main valve through the filter 3, and when the system does not act, the output flow of the single gear pump 2 passes through the priority oil port P1, so that a small load is overcome, and the system is unloaded. When a certain load unit in the system acts, if the sewage tank needs to be opened, the electromagnets S1 and Y2 are electrified, the controller gives a set current to the electric proportional flow valve 6, the set current enters the rod cavity of the sewage tank switch oil cylinder 15 through the proportional throttle orifice of the proportional throttle valve 16, the piston rod moves leftwards, the sewage tank is opened, and redundant flow can be unloaded through the priority oil port P1; when the sewage tank needs to be closed, the electromagnet Y1 is electrified, the flow enters the rodless cavity of the sewage tank switch oil cylinder 15, the piston rod moves to the right, and the sewage tank is closed. Similarly, the opening and closing of the sewage draining port can be controlled by the electrification of the electromagnets Y3 and Y4, the ascending and descending of the snow melting device are controlled by the electrification of the electromagnets Y6 and Y8, and the ascending and descending of the suction device are controlled by the electrification of the electromagnets Y7 and Y9. The right fan motor 8, the left fan motor 9, the snow-melting drum brush motor 11 and the suction drum brush motor 10 can be controlled to turn right at the same time by energizing the electromagnets Y5, Y10, Y12 and Y15 at the same time, and the right fan motor 8, the left fan motor 9, the snow-melting drum brush motor 11 and the suction drum brush motor 10 can be controlled to turn left at the same time by energizing the electromagnets Y5, Y11, Y13 and Y14 at the same time. When the different loads act, the controller outputs different currents to the electric proportional flow valve 6, so that the opening degrees of the proportional throttle orifices of the proportional throttle valve 16 are different, and different requirements on flow during the work of the different loads are met. When the system works, the sewage tank switch oil cylinder 15 is locked by a balance valve, the sewage device oil cylinder 14 is locked by a bidirectional hydraulic lock, and the snow melting device lifting oil cylinder 13 and the suction device lifting oil cylinder 12 are locked by a one-way valve. When the snow melting device and the suction device descend, the electromagnets Y8 and Y9 are powered on, the locking one-way valve is opened, the snow melting device and the suction device fall by means of self gravity, and in the falling process, the oil supplementing pipeline supplements oil to rodless cavities of the snow melting device lifting oil cylinder 13 and the suction device lifting oil cylinder 12. The right fan motor 8, the left fan motor 9, the suction brush roller motor 10, and the snow-melting brush roller motor 11 individually return oil from oil drain ports provided thereon.
In other embodiments, the number of the hydraulic pumps may be multiple, and in this case, the multiple hydraulic pumps are connected in parallel to drive the loads simultaneously.
Example of snow melting vehicle: the snow melting vehicle comprises a vehicle body and a hydraulic control system applied to the vehicle body, wherein the structure of the hydraulic control system is the same as that of the hydraulic control system in the embodiment, and the details are not repeated.
Claims (5)
1. A hydraulic control system comprises more than two load units, a hydraulic pump for driving the load units to act, and electromagnetic valves for controlling the action of each load unit respectively, and is characterized in that: the hydraulic control system further comprises an electric proportional flow valve, an oil inlet of the electric proportional flow valve is connected with an outlet of the hydraulic pump, an oil outlet of the electric proportional flow valve is controlled to be connected with an oil inlet of an electromagnetic valve of the load unit, an oil return port of the electric proportional flow valve is connected with an oil tank, and the hydraulic control system further comprises a control unit connected with the electromagnetic valve and an electromagnet of the electric proportional flow valve.
2. The hydraulic control system of claim 1, wherein: the number of the hydraulic pumps is one.
3. The utility model provides a snow melting vehicle, includes the automobile body and applies the hydraulic control system on the automobile body, hydraulic control system includes more than two load units, is used for driving the hydraulic pump of load unit action still includes the solenoid valve that is used for controlling each load unit action respectively, its characterized in that: the hydraulic control system further comprises an electric proportional flow valve, an oil inlet of the electric proportional flow valve is connected with an outlet of the hydraulic pump, an oil outlet of the electric proportional flow valve is controlled to be connected with an oil inlet of an electromagnetic valve of the load unit, an oil return port of the electric proportional flow valve is connected with an oil tank, and the hydraulic control system further comprises a control unit connected with the electromagnetic valve and an electromagnet of the electric proportional flow valve.
4. The snow melting vehicle of claim 3, wherein: the number of the hydraulic pumps is one.
5. The snow melting vehicle of claim 3, wherein: the load unit comprises a snow melting device lifting oil cylinder and a suction device lifting oil cylinder, and rodless cavities of the snow melting device lifting oil cylinder and the suction device lifting oil cylinder are communicated with the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810981956.2A CN110864017A (en) | 2018-08-27 | 2018-08-27 | Hydraulic control system and snow melting vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810981956.2A CN110864017A (en) | 2018-08-27 | 2018-08-27 | Hydraulic control system and snow melting vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN110864017A true CN110864017A (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810981956.2A Pending CN110864017A (en) | 2018-08-27 | 2018-08-27 | Hydraulic control system and snow melting vehicle |
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| CN (1) | CN110864017A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033433A (en) * | 2014-05-06 | 2014-09-10 | 长安大学 | Hydraulic control system based on single-engine road sweeper |
| CN205190402U (en) * | 2015-12-07 | 2016-04-27 | 福建龙马环卫装备股份有限公司 | Small -size full hydraulic drive road sweeper hydraulic motor drive system |
| CN205349896U (en) * | 2016-01-21 | 2016-06-29 | 南京英达公路养护车制造有限公司 | A hydraulic motor control valve for on hydraulic system return circuit |
| CN207762060U (en) * | 2017-12-26 | 2018-08-24 | 长沙天盾重工有限责任公司 | A kind of overhead working truck system |
| CN209146012U (en) * | 2018-08-27 | 2019-07-23 | 河南森源重工有限公司 | Hydraulic control system and snow melting vehicle |
-
2018
- 2018-08-27 CN CN201810981956.2A patent/CN110864017A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033433A (en) * | 2014-05-06 | 2014-09-10 | 长安大学 | Hydraulic control system based on single-engine road sweeper |
| CN205190402U (en) * | 2015-12-07 | 2016-04-27 | 福建龙马环卫装备股份有限公司 | Small -size full hydraulic drive road sweeper hydraulic motor drive system |
| CN205349896U (en) * | 2016-01-21 | 2016-06-29 | 南京英达公路养护车制造有限公司 | A hydraulic motor control valve for on hydraulic system return circuit |
| CN207762060U (en) * | 2017-12-26 | 2018-08-24 | 长沙天盾重工有限责任公司 | A kind of overhead working truck system |
| CN209146012U (en) * | 2018-08-27 | 2019-07-23 | 河南森源重工有限公司 | Hydraulic control system and snow melting vehicle |
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Application publication date: 20200306 |
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