Snowplow and its hydraulic control system

Abstract

This application discloses a snowplow and its hydraulic control system. The hydraulic control system includes an oil pump assembly, a first oil supply circuit, a second oil supply circuit, and a control unit. The oil pump assembly includes a first hydraulic pump and a second hydraulic pump connected coaxially in series. The first hydraulic pump supplies oil to the roller brush motor through the first oil supply circuit, which is equipped with a distribution valve. The second hydraulic pump is located on the second oil supply circuit. A merging circuit is provided on the connecting circuit between the first and second oil supply circuits, and a confluence valve is provided on the merging circuit. The control unit is electrically connected to both the distribution valve and the confluence valve and is configured to: acquire the load condition of the roller brush motor; and control the operation of the distribution valve or the confluence valve according to the load condition of the roller brush motor, so that the first oil supply circuit or the merging circuit supplies oil to the roller brush motor. This application, through the switching action of the distribution valve and the confluence valve, can meet the different load conditions of the roller brush motor and achieve full utilization of energy.

Description

Technical Field

[0001] This application belongs to the field of snow removal equipment technology, specifically relating to a snow removal vehicle and its hydraulic control system. Background Technology

[0002] Winter snow removal is a crucial public welfare project. With continuous societal progress, the demand for various forms of snow removal is increasing, and environmental protection requirements are also rising. Snowplows are equipped with snow-removing rollers at the front, whose high-speed rotation sweeps snow to one side of the road before it is transported away. A de-icing agent spreader is installed at the rear to apply de-icing agent to the road surface, preventing icing. This system can operate under various conditions, offering high efficiency and good results. In existing technology, the rotation of the snow-removing rollers and the operation of the spreader are powered by a hydraulic pump driven by an auxiliary engine, and the snow-removing rollers typically operate at only a single speed. However, when the snow and ice are thick, the snow removal roller brush can no longer clear the snow and ice off the ground at normal speed. If a high-speed roller brush is used for snow removal, a new power source is required to power the snow removal roller brush. In addition, in the existing technology, the hydraulic cylinder of the snow removal roller brush is driven by a power unit that is separately installed on the roller brush. This means that the movement of one part of the snow removal roller brush needs to be provided by two power sources: the hydraulic pump of the auxiliary engine and the power unit. The power system structure is complicated, and the auxiliary engine only drives one hydraulic pump, resulting in serious power waste. Summary of the Invention

[0003] The purpose of this application is to provide a snowplow and its hydraulic control system, which uses an oil pump assembly to achieve hydraulic oil flow distribution in the system, thereby saving power energy.

[0004] To achieve the above objectives, this application provides a hydraulic control system for a snowplow, the snowplow including a snowplow brush and a brush motor for driving the snowplow brush, the hydraulic control system including:

[0005] The oil pump assembly includes a first hydraulic pump and a second hydraulic pump connected in series on the same axis.

[0006] The first oil supply circuit is used to supply oil to the roller brush motor by the first hydraulic pump. A distribution valve is provided on the first oil supply circuit.

[0007] A second oil supply circuit is provided, and a second hydraulic pump is installed on the second oil supply circuit. A merging circuit is provided on the connecting oil circuit between the first and second oil supply circuits, and a merging valve is provided on the merging oil circuit; and

[0008] The control unit, electrically connected to both the distribution valve and the confluence valve, is configured to:

[0009] Obtain the load conditions of the roller brush motor;

[0010] The control valve or merging valve operates according to the load conditions of the roller brush motor, so that the first oil supply circuit or the merging oil circuit supplies oil to the roller brush motor.

[0011] In some embodiments, the displacement of the first hydraulic pump is greater than that of the second hydraulic pump, the first oil supply circuit includes a first sub-oil supply circuit, the distribution valve includes a first distribution valve disposed on the first sub-oil supply circuit, and the control unit is further configured to:

[0012] When the roller brush motor is operating at its normal speed, the first distribution valve is activated to supply all the hydraulic oil from the first hydraulic pump to the roller brush motor.

[0013] When the roller brush motor is working at high speed, the control confluence valve is activated to simultaneously supply hydraulic oil from the first hydraulic pump and the second hydraulic pump to the roller brush motor.

[0014] In some embodiments, the first oil supply circuit further includes a second sub-oil supply circuit, and the distribution valve further includes a second distribution valve disposed on the second sub-oil supply circuit; the snowplow also includes a spreader and a spreader motor for driving the spreader, and the control unit is further configured to:

[0015] When the spreader is working, the second distribution valve is activated to supply all the hydraulic oil from the first hydraulic pump to the spreader motor.

[0016] In some embodiments, the spreader motor includes a scraper motor and a swivel motor, a spreading control valve assembly is provided on the second sub-oil supply line, and the control unit is further configured to:

[0017] When the scraper motor is working, the first distribution valve, the second distribution valve, and the spreading control valve group are activated simultaneously to ensure that all the hydraulic oil from the first hydraulic pump is supplied to the scraper motor.

[0018] When the sling motor is working, the first distribution valve, the second distribution valve, and the spreading control valve group are activated simultaneously to ensure that all the hydraulic oil from the first hydraulic pump is supplied to the sling motor.

[0019] In some embodiments, the spreading control valve assembly includes two proportional solenoid valves connected in parallel, each of which is located in the oil circuit of the scraper motor and the swivel motor.

[0020] In some embodiments, the hydraulic control system further includes a cylinder control valve assembly located on the second oil supply line, the cylinder control valve assembly being used to control the on / off state of the second oil supply line.

[0021] In some embodiments, the snowplow also includes a hydraulic cylinder assembly for controlling the working posture of the snowplow brush, the hydraulic cylinder assembly comprising:

[0022] The lifting cylinder is used to drive the snow removal roller brush to rise and fall;

[0023] A roller brush oscillation cylinder is used to drive the snow removal roller brush to oscillate; and

[0024] The bristle adjustment cylinder is used to drive the bristles of the snow removal roller to extend or depress.

[0025] In some embodiments, the cylinder control valve assembly includes three solenoid valves arranged in parallel, each solenoid valve being located in the hydraulic circuit of the lifting cylinder, the roller brush swing cylinder, and the brush bristle adjusting cylinder, respectively. The control unit is further configured to:

[0026] To obtain the working posture required by the snow removal roller brush;

[0027] Control the action of each solenoid valve according to the required working posture.

[0028] In some embodiments, the hydraulic control system also includes an oil tank, an oil pump assembly, and a ball valve on the oil line connecting the oil tank;

[0029] And / or, a return oil filter is installed in the return oil line of the hydraulic control system.

[0030] In some embodiments, the oil tank contains a sensor assembly for monitoring the hydraulic oil level and temperature. The snowplow also includes an alarm module. The control unit is electrically connected to both the sensor assembly and the alarm module and is further configured to:

[0031] Acquire liquid level and oil temperature information sent by the sensor components;

[0032] When the hydraulic oil level is lower than the preset height or the oil temperature is higher than the preset temperature, the control alarm module will issue an alarm.

[0033] A second aspect of this application provides a snowplow, including a chassis and a hydraulic control system as described above, wherein a cargo box is mounted on the chassis and the hydraulic control system is located inside the cargo box.

[0034] Through the above technical solution, the hydraulic control system of the snowplow provided in this application embodiment has the following beneficial effects:

[0035] This application simplifies the hydraulic system structure and saves energy by using two coaxially connected hydraulic pumps to distribute hydraulic oil and drive the snow removal roller brush. During operation, a distribution valve is installed on the first oil supply line. Switching the distribution valve allows the first hydraulic pump to supply oil to the roller brush motor through the first oil supply line. A second hydraulic pump is located on the second oil supply line. A merging line is installed on the connecting line between the first and second oil supply lines, and a merging valve is installed on the merging line. When the roller brush motor is working, the control unit obtains the load condition of the roller brush motor; based on the load condition, it controls the distribution valve or merging valve to operate, so that the hydraulic oil from the first oil supply line or the first and second hydraulic pumps merges to supply oil to the roller brush motor. Furthermore, by switching the distribution valve and the merging valve, the different load conditions of the roller brush motor can be met, achieving full utilization of energy.

[0036] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0038] Figure 1 This is a schematic diagram of the snowplow in the embodiments of this application;

[0039] Figure 2 This is a schematic diagram of the hydraulic control system in the snowplow according to an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the hydraulic principle of the hydraulic control system in the snowplow of this application embodiment.

[0041] Explanation of reference numerals in the attached figures

[0042] 101 Snow removal roller brush 2052 Second distribution valve

[0043] 102 chassis, 206 fuel tank

[0044] 103 Hydraulic control system 207 Radiator

[0045] 104 Spreader, 208 Hydraulic Cylinder Control Valve Assembly

[0046] 105 Cargo Box 209 Spreading Control Valve Assembly

[0047] 106 Lifting cylinder; 210 Exhaust gas recovery and purification device

[0048] 107 Roller brush swing cylinder 211 Overflow valve

[0049] 108 Brush Adjustment Cylinder 212 Ball Valve

[0050] 109 Roller brush motor 213 Return oil filter

[0051] 110 Scraper Motor 214 Sensor Assembly

[0052] 111 Spinning disc motor; 215 High-pressure filter

[0053] 201 Diesel Engine 216 Floating Valve

[0054] 202 First hydraulic pump L1 First oil supply circuit

[0055] 203 Second hydraulic pump L11 First sub-oil supply circuit

[0056] 204 Combination Valve L12 Second Sub-Fuel Supply Circuit

[0057] 205 Distribution Valve L2 Second Oil Supply Circuit

[0058] 2051 First distribution valve 217 Check valve Detailed Implementation

[0059] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0060] The snowplow and its hydraulic control system according to this application are described below with reference to the accompanying drawings.

[0061] like Figure 3As shown, this application proposes a hydraulic control system 103 for a snowplow. The snowplow includes a snowplow brush 101 and a brush motor 109 that drives the snowplow brush 101. The hydraulic control system 103 includes an oil pump assembly, a first oil supply line L1, a second oil supply line L2, and a control unit. The oil pump assembly includes a first hydraulic pump 202 and a second hydraulic pump 203 connected coaxially in series. The first hydraulic pump 202 supplies oil to the brush motor 109 through the first oil supply line L1. A distribution valve 2 is provided on the first oil supply line L1. 05; The second hydraulic pump 203 is installed on the second oil supply circuit L2; A merging circuit is provided on the connecting oil line between the first oil supply circuit L1 and the second oil supply circuit L2, and a merging valve 204 is provided on the merging oil line; The control unit is electrically connected to both the distribution valve 205 and the merging valve 204 and is configured to: obtain the load condition of the roller brush motor 109; control the distribution valve 205 or the merging valve 204 to operate according to the load condition of the roller brush motor 109, so that the first oil supply circuit L1 or the merging oil line supplies oil to the roller brush motor 109.

[0062] This application provides power to the working device of the snowplow vehicle via a dual gear pump, enabling the snowplow roller brush 101 to operate. The snowplow roller brush 101 operates in two modes: a normal speed mode and a high speed mode. During operation, a diesel engine 201 drives two hydraulic pumps connected in series. Since the first hydraulic pump 202 and the second hydraulic pump 203 are coaxially connected, the rotation of the diesel engine 201 drives both hydraulic pumps to rotate together. The two hydraulic pumps draw hydraulic oil from the oil tank 206. The hydraulic oil drawn by the first hydraulic pump 202 is distributed through a distribution valve 205. When the snowplow roller brush 101 rotates at normal speed, the distribution valve 205 distributes the hydraulic oil drawn by the first hydraulic pump 202 to the roller brush motor 109. At this time, the snowplow roller brush 101 can be used to clear snow from the road surface at a lower vehicle speed. When the snowplow roller brush 101 rotates at high speed, a larger driving power is required. At this time, the confluence valve opens, and the hydraulic oil from the merged oil circuit is used to supply oil to the roller brush motor 109, thereby achieving snow clearing at a higher speed. Compared with the existing technology that uses two power mechanisms, an auxiliary engine to drive the hydraulic pump and a power unit, this application uses an auxiliary engine to drive the dual pump and realizes the flow distribution of the system through the action of the distribution valve 205 and the confluence valve 204, which saves power energy and simplifies the structure of the entire hydraulic system.

[0063] In some embodiments, the displacement of the first hydraulic pump 202 is greater than the displacement of the second hydraulic pump 203, the first oil supply circuit L1 includes a first sub-oil supply circuit L11, the distribution valve 205 includes a first distribution valve 2051 disposed on the first sub-oil supply circuit L11, and the control unit is further configured to:

[0064] When the roller brush motor 109 is operating at its normal speed, the first distribution valve 2051 is activated to supply all the hydraulic oil from the first hydraulic pump 202 to the roller brush motor 109.

[0065] When the roller brush motor 109 is working at high speed, the control confluence valve 204 is activated to simultaneously supply hydraulic oil from the first hydraulic pump 202 and the second hydraulic pump 203 to the roller brush motor 109.

[0066] Since the displacement of the second hydraulic pump 203 is smaller than that of the first hydraulic pump 202, the hydraulic oil drawn by the second hydraulic pump 203 can be combined with the hydraulic oil drawn by the first hydraulic pump 202 through the confluence valve 204 and supplied to the roller brush motor 109. At this time, more hydraulic oil flows through the hydraulic motor, causing the snow removal roller brush 101 to rotate at high speed for quickly clearing snow from the road surface. During the control process, when the distribution valve 205 distributes the hydraulic oil drawn by the first hydraulic pump 202 to the roller brush motor 109, the system will control the maximum speed of the auxiliary engine to not exceed the maximum speed (about 2200 rpm). The two speeds can be matched to the load conditions of the snow removal roller brush 101 respectively, achieving economic adaptation.

[0067] Furthermore, when the roller brush motor 109 rotates at a constant speed, the Y1 solenoid of the first distribution valve 2051 and the Y2 solenoid of the check valve 217 are energized, and hydraulic oil flows from the first hydraulic pump 202 to the roller brush motor 109, driving the roller brush motor 109 to move. When the roller brush rotates at high speed, the Y18 solenoid of the confluence valve 204 is energized and opens, combining the hydraulic oil from the second hydraulic pump 203 with the hydraulic oil from the first hydraulic pump 202 to drive the roller brush motor 109 to rotate at high speed. When the roller brush motor 109 stops, the Y1 solenoid of the first distribution valve 2051 is de-energized first, and the Y2 solenoid of the check valve 217 is de-energized after a delay of several seconds, slowing down the rapid change in hydraulic oil flow that could cause the hydraulic motor to cavitate.

[0068] In some embodiments, the first oil supply circuit L1 further includes a second sub-oil supply circuit L12, and the distribution valve 205 further includes a second distribution valve 2052 disposed on the second sub-oil supply circuit L12; the snowplow also includes a spreader 104 and a spreader motor for driving the spreader 104, and the control unit is further configured to:

[0069] When the spreader 104 is working, the second distribution valve 2052 is activated to supply all the hydraulic oil from the first hydraulic pump 202 to the spreader motor.

[0070] Specifically, when the hydraulic oil drawn by the first hydraulic pump 202 is distributed to the spreader 104, it can be used to drive the spreader 104 to spread de-icing agent and prevent the road surface from freezing. Furthermore, when the second distribution valve 2052 distributes hydraulic oil to the spreader 104, the system will control the maximum speed of the auxiliary engine to not exceed the maximum speed (approximately 1300 rpm).

[0071] Furthermore, the spreader motor includes a scraper motor 110 and a swivel disc motor 111, and a spreading control valve assembly 209 is provided on the second sub-oil supply line L12. The control unit is further configured as follows:

[0072] When the scraper motor 110 is working, the first distribution valve 2051, the second distribution valve 2052 and the spreading control valve group 209 are controlled to operate simultaneously so that all the hydraulic oil of the first hydraulic pump 202 is supplied to the scraper motor 110.

[0073] When the sling motor 111 is working, the first distribution valve 2051, the second distribution valve 2052 and the spreading control valve group 209 are operated simultaneously so that all the hydraulic oil of the first hydraulic pump 202 is supplied to the sling motor 111.

[0074] The spreading control valve assembly 209 is equipped with two solenoid valves that control the scraper motor 110 and the swivel motor 111 of the spreading machine 104 respectively. When the scraper motor 110 is working, the Y3 solenoid of the second distribution valve 2052 and the Y20 solenoid on the spreading control valve assembly 209 are energized, and the first hydraulic pump 202 drives the scraper motor 110 to rotate through the second sub-oil supply circuit L12. When the swivel motor 111 is working, the Y3 solenoid of the second distribution valve 2052 and the Y21 solenoid on the spreading control valve assembly 209 are energized, and the first hydraulic pump 202 drives the swivel motor 111 to rotate through the second sub-oil supply circuit L12. It should be noted that, in order to prevent the hydraulic oil circuit of the first hydraulic pump 202 from becoming blocked, when the scraper motor 110 or the sling motor 111 is working, the Y1 solenoid of the first distribution valve 2051 needs to be energized and the Y2 solenoid of the check valve 217 needs to be de-energized. This ensures that the hydraulic oil of the first hydraulic pump 202 flows to the second sub-supply oil circuit L12, and also prevents the first sub-supply oil circuit L11 from becoming blocked.

[0075] In some embodiments, the spreading control valve assembly 209 includes two proportional solenoid valves arranged in parallel, each of which is located in the oil circuit where the scraper motor 110 and the sling motor 111 are located. The proportional solenoid valves can proportionally control the current; in actual operation, the opening degree of the proportional solenoid valve is controlled by adjusting the magnitude of the proportional current, thereby controlling the rotational speeds of the scraper motor 110 and the sling motor 111.

[0076] Among them, a high-pressure filter 215 is also installed on the second sub-oil supply line L12 to pre-filter the hydraulic oil entering the spreader motor control, protect the proportional solenoid valve in the spreader control valve group 209, prevent jamming, and accurately control the hydraulic flow, thereby controlling the speed of the spreader motor.

[0077] In some embodiments, the hydraulic control system 103 further includes a cylinder control valve assembly 208 disposed on the second oil supply circuit L2, which is used to control the on / off state of the second oil supply circuit L2. By providing the cylinder control valve assembly 208, all the hydraulic oil from the second hydraulic pump 203 can be supplied to the cylinder assembly, and the driving of the cylinder assembly and the roller brush motor 109 and the spreader motor can be performed independently, making the driving action more reliable.

[0078] In some embodiments, the snowplow also includes a hydraulic cylinder assembly for controlling the working posture of the snowplow roller brush 101. The hydraulic cylinder assembly includes a lifting cylinder 106, a roller brush swinging cylinder 107, and a bristle adjusting cylinder 108. The lifting cylinder 106 is used to drive the snowplow roller brush 101 to rise and fall; the roller brush swinging cylinder 107 is used to drive the snowplow roller brush 101 to swing; and the bristle adjusting cylinder 108 is used to drive the bristles of the snowplow roller brush 101 to stretch or press down.

[0079] When the snow removal roller brush 101 is lifted, the Y11 and Y12 electromagnets on the cylinder control valve assembly 208 are energized to drive the lifting cylinder 106 to extend and lift the roller brush. When the snow removal roller brush 101 is lowered, the Y11 and Y13 electromagnets on the cylinder control valve assembly 208 are energized to drive the piston rod of the lifting cylinder 106 to shorten and lower the roller brush. A floating valve 216 is also provided on the second oil supply circuit L2. When the lifting cylinder 106 floats, the Y9 and Y10 electromagnets of the floating valve 216 are energized, and both the rod chamber and the rodless chamber of the lifting cylinder 106 are connected to the oil tank 206. The roller brush falls to the ground under the action of gravity. When the roller brush is working, when the roller brush is subjected to bumpy force, the piston rod of the lifting cylinder 106 can freely extend and retract to allow the roller brush to adapt to the unevenness of the road surface.

[0080] The roller brush swing cylinder 107 includes a left swing cylinder and a right swing cylinder. When the roller brush needs to swing to the left, the Y11 and Y14 electromagnets on the cylinder control valve group 208 are energized, the piston rod of the left swing cylinder extends, and the piston rod of the right swing cylinder shortens, driving the roller brush to swing to the left. When the roller brush needs to swing to the right, the Y11 and Y15 electromagnets on the cylinder control valve group 208 are energized, the piston rod of the left swing cylinder shortens, and the piston rod of the right swing cylinder extends, driving the roller brush to swing to the right.

[0081] When the brush bristles are adjusted downwards, the Y11 and Y16 electromagnets on the hydraulic cylinder control valve group 208 are energized to drive the piston rod of the brush bristle adjustment cylinder 108 to extend, causing the brush head of the brush to press downwards; when the brush bristles are adjusted upwards, the Y11 and Y17 electromagnets on the hydraulic cylinder control valve group 208 are energized to drive the piston rod of the brush bristle adjustment cylinder 108 to shorten, causing the brush head of the brush to pull upwards.

[0082] In some embodiments, the cylinder control valve group 208 includes three solenoid valves arranged in parallel. Each solenoid valve is respectively located in the oil circuit of the lifting cylinder 106, the roller brush swing cylinder 107, and the brush bristle adjustment cylinder 108. The control unit is further configured to: obtain the working posture required by the snow removal roller brush 101; and control the action of each solenoid valve according to the required working posture.

[0083] Since the snow removal roller brush 101 is adjusted to the most suitable working posture by the coordinated action of the three cylinders, namely the lifting cylinder 106, the roller brush swing cylinder 107, and the bristle adjustment cylinder 108, this application uses the three solenoid valves of the cylinder control valve group 208 to adjust the extension and retraction of the piston rod of each corresponding cylinder. The adjustment actions do not affect each other, which can improve the efficiency of action adjustment.

[0084] In some embodiments, the solenoid valve is a three-position six-way solenoid valve. The inlet and outlet of each solenoid valve are connected to the rod-side and rodless-side chambers of the corresponding hydraulic cylinder, respectively. The oil inlet and outlet of the rod-side and rodless-side chambers are controlled by switching the solenoid valve. Since the three-position six-way solenoid valve is a common control valve structure in the prior art, its working principle will not be described in detail here.

[0085] In addition, the cylinder control valve assembly 208 also includes a relief valve 211, which is set with a suitable relief pressure during operation. When the system exceeds this pressure, the relief valve protects the hydraulic system.

[0086] In some embodiments, the hydraulic control system 103 also includes an oil tank 206, and a ball valve 212 is provided on the oil line connecting the oil pump assembly and the oil tank 206. The ball valve 212 is used to control the oil inlet of the hydraulic pump. When hydraulic system maintenance is required, both ball valves 212 can be closed to prevent hydraulic oil loss. In addition, a return oil filter 213 is provided on the return oil line. The return oil filter 213 filters the hydraulic oil that has passed through the working parts of the hydraulic system before returning it to the oil tank 206.

[0087] In some embodiments, the oil tank 206 is equipped with a sensor assembly 214 for monitoring the hydraulic oil level and temperature. In addition, the snowplow also includes an alarm module. The control unit is electrically connected to both the sensor assembly 214 and the alarm module and is further configured to: acquire the hydraulic oil level and temperature information sent by the sensor assembly 214; and control the alarm module to issue an alarm when the hydraulic oil level is lower than a preset height or the oil temperature is higher than a preset temperature.

[0088] The alarm module can use alarm modes commonly found in existing technologies, such as audible alarms and photoelectric alarms. The sensor component 214 includes a liquid level sensor and a liquid temperature sensor, which are used to monitor the liquid level and temperature of the hydraulic oil in the oil tank 206 in real time, respectively, to achieve real-time monitoring of the hydraulic oil in the oil tank 206 and to provide timely early warning of faults.

[0089] like Figure 1 and Figure 2 As shown, a second aspect of this application provides a snowplow, including a chassis 102 and a hydraulic control system 103 as described above. A cargo box 105 is mounted on the chassis 102, and the hydraulic control system 103 is located inside the cargo box 105. The snowplow roller brush 101 and the spreader 104 are detachably mounted on the front and rear ends of the chassis 102, respectively. All parts of the chassis 102 are modular, compact, relatively independent, and offer greater reliability and adaptability. They can be flexibly combined; for example, the snowplow can be equipped with the snowplow roller brush 101 alone, or the spreader 104 alone, or both simultaneously, to meet various customer needs.

[0090] In addition, the snowplow's drive system is equipped with an exhaust gas recovery and purification device 210 and a radiator 207. The radiator dissipates heat from the entire drive system to protect it. The exhaust gas recovery and purification device 210 uses a catalyst and high temperature to burn off the carbon and harmful components in the exhaust gas emitted by the diesel engine 201 under different loads, thus protecting the environment.

[0091] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hydraulic control system for a snowplow, characterized in that, The snowplow includes a snowplow brush (101) and a brush motor (109) for driving the snowplow brush (101). The hydraulic control system (103) includes: The oil pump assembly includes a first hydraulic pump (202) and a second hydraulic pump (203) connected in series on the same axis. The first oil supply line (L1) is used to supply oil to the roller brush motor (109) through the first oil supply line (L1). A distribution valve (205) is provided on the first oil supply line (L1). The second oil supply circuit (L2) is provided with the second hydraulic pump (203) mounted on it. A merging circuit is provided on the connecting oil line between the first oil supply circuit (L1) and the second oil supply circuit (L2), and a merging valve (204) is provided on the merging circuit. The control unit, electrically connected to both the distribution valve (205) and the confluence valve (204), is configured to: Obtain the load conditions of the roller brush motor (109); The distribution valve (205) or the merging valve (204) is controlled to operate according to the load condition of the roller brush motor (109) so that the first oil supply circuit (L1) or the merging circuit supplies oil to the roller brush motor (109). The first oil supply circuit (L1) further includes a second sub-oil supply circuit (L12), and the distribution valve (205) further includes a second distribution valve (2052) disposed on the second sub-oil supply circuit (L12); the snowplow also includes a spreader (104) and a spreader motor for driving the spreader (104), and the control unit is further configured to: When the spreader (104) is working, the second distribution valve (2052) is controlled to operate so that all the hydraulic oil from the first hydraulic pump (202) is supplied to the spreader motor.

2. The hydraulic control system of the snowplow according to claim 1, characterized in that, The displacement of the first hydraulic pump (202) is greater than that of the second hydraulic pump (203). The first oil supply circuit (L1) includes a first sub-oil supply circuit (L11). The distribution valve (205) includes a first distribution valve (2051) disposed on the first sub-oil supply circuit (L11). The control unit is further configured to: When the roller brush motor (109) is operating at normal speed, the first distribution valve (2051) is controlled to operate so that all the hydraulic oil of the first hydraulic pump (202) is supplied to the roller brush motor (109). When the roller brush motor (109) operates at high speed, the confluence valve (204) is controlled to operate so that the hydraulic oil from the first hydraulic pump (202) and the second hydraulic pump (203) is supplied to the roller brush motor (109) simultaneously.

3. The hydraulic control system of the snowplow according to claim 2, characterized in that, The spreader motor includes a scraper motor (110) and a swivel motor (111), and a spreading control valve assembly (209) is provided on the second sub-oil supply line (L12). The control unit is further configured to: When the scraper motor (110) is working, the first distribution valve (2051), the second distribution valve (2052) and the spreading control valve group (209) are controlled to operate simultaneously so that all the hydraulic oil of the first hydraulic pump (202) is supplied to the scraper motor (110). When the swivel motor (111) is working, the first distribution valve (2051), the second distribution valve (2052) and the spreading control valve group (209) are controlled to operate simultaneously so that all the hydraulic oil of the first hydraulic pump (202) is supplied to the swivel motor (111).

4. The hydraulic control system of the snowplow according to claim 3, characterized in that, The spreading control valve group (209) includes two proportional solenoid valves arranged in parallel, each of which is located on the oil line where the scraper motor (110) and the swivel motor (111) are located.

5. The hydraulic control system of the snowplow according to claim 1, characterized in that, The hydraulic control system (103) further includes a cylinder control valve group (208) disposed on the second oil supply circuit (L2), the cylinder control valve group (208) being used to control the opening and closing of the second oil supply circuit (L2).

6. The hydraulic control system of the snowplow according to claim 5, characterized in that, The snowplow also includes a hydraulic cylinder assembly for controlling the working posture of the snowplow roller (101), the hydraulic cylinder assembly comprising: A lifting cylinder (106) is used to drive the snow removal roller brush (101) to rise and fall; A roller brush oscillation cylinder (107) is used to drive the snow removal roller brush (101) to oscillate; and A bristle adjustment cylinder (108) is used to drive the bristles of the snow removal roller brush (101) to extend or depress.

7. The hydraulic control system of the snowplow according to claim 6, characterized in that, The hydraulic cylinder control valve group (208) includes three solenoid valves arranged in parallel. Each solenoid valve is respectively located in the hydraulic circuit of the lifting cylinder (106), the roller brush swing cylinder (107), and the bristle adjusting cylinder (108). The control unit is further configured as follows: Obtain the working posture required for the snow removal roller brush (101); Control the action of each solenoid valve according to the required working posture.

8. The hydraulic control system of the snowplow according to any one of claims 1 to 7, characterized in that, The hydraulic control system (103) also includes an oil tank (206), and a ball valve (212) is provided on the oil line connecting the oil pump assembly and the oil tank (206). And / or, a return oil filter (213) is provided on the return oil line of the hydraulic control system (103).

9. The hydraulic control system of the snowplow according to claim 8, characterized in that, The oil tank (206) is equipped with a sensor assembly (214) for monitoring the hydraulic oil level and temperature. The snowplow also includes an alarm module. The control unit is electrically connected to both the sensor assembly (214) and the alarm module and is further configured to: Acquire the liquid level height information and oil temperature information sent by the sensor assembly (214); When the hydraulic oil level is lower than the preset height or the oil temperature is higher than the preset temperature, the alarm module is controlled to issue an alarm.

10. A snowplow, characterized in that, Includes a chassis (102) and a hydraulic control system (103) according to any one of claims 1 to 9, wherein a cargo box (105) is mounted on the chassis (102) and the hydraulic control system (103) is disposed within the cargo box (105).

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