Hydraulic control system and method and dust suppression vehicle

Abstract

According to the hydraulic control system and method and the dust suppression vehicle, due to the fact that an inlet of a first hydraulic valve set can be communicated with at least one of a first outlet and a second outlet, hydraulic oil conveyed when a first oil pump works can drive a water pump motor, a swing motor and a pitching oil cylinder to work at the same time; the number of oil pumps is reduced, the cost is reduced, the flow proportion between the first outlet and the second outlet can be adjusted, so that the flow of the first outlet and the flow of the second outlet can be flexibly distributed, and the flow of the second outlet is correspondingly reduced when the flow of the first outlet is increased. Therefore, the rotating speed of the water pump motor can be flexibly adjusted to adapt to more working conditions.

Description

Technical Field

[0001] This application relates to the technical field of environmental sanitation equipment, and in particular, to a hydraulic control system, method, and dust suppression vehicle. Background Art

[0002] A dust suppression vehicle is an important environmental sanitation equipment for preventing and controlling air pollution. It uses the high-speed airflow generated by a fan to drive water mist to the polluted area, where the water mist can combine with dust particles in the air and fall to the ground. The hydraulic system of a dust suppression vehicle generally controls the rotation of the fan, the rotation of the spray water pump motor, and the movement of the gun barrel. The movement of the gun barrel includes left and right swinging and up and down pitching movements.

[0003] However, the current hydraulic system has the following problems:

[0004] 1. Multiple oil pumps are respectively used to drive the rotation of the fan, the rotation of the spray water pump motor, and the movement of the gun barrel, which requires a large space, has complex pipeline connections, and high costs.

[0005] 2. Usually, a multi-way directional control valve is used to achieve each single movement of the gun barrel. If a compound movement of the gun barrel is to be achieved, then the multi-way directional control valve needs to have a load pressure compensation function, resulting in high costs.

[0006] 3. The spray water pump motor is only for driving purposes and cannot adapt to various working conditions. Summary of the Invention

[0007] The purpose of this application is to provide a hydraulic control system, method, and dust suppression vehicle that can simultaneously achieve multiple movements of the gun barrel, have lower costs, and can adapt to more working conditions.

[0008] The embodiments of this application can be implemented as follows:

[0009] In a first aspect, the present invention provides a hydraulic control system for a dust suppression vehicle, including a first oil pump, a first hydraulic valve group, a water pump motor, a swing motor, and a pitching oil cylinder;

[0010] The first hydraulic valve group has an inlet, a first outlet, and a second outlet. The inlet is connected to the first oil pump, and the inlet can be selectively communicated with at least one of the first outlet and the second outlet. Among them, the flow ratio between the first outlet and the second outlet can be adjusted;

[0011] The water pump motor is connected to the first outlet;

[0012] The second outlet is connected to both the swing motor and the pitching oil cylinder.

[0013] In an alternative embodiment, the first hydraulic valve group includes a three-way proportional flow valve and an overflow valve;

[0014] The three-way proportional flow valve has the inlet, the first outlet and the second outlet, and the inlet and the inlet of the overflow valve are both connected to the first oil pump;

[0015] Wherein, the three-way proportional flow valve is electromagnetically driven, and the flow ratio between the first outlet and the second outlet can be changed by changing the magnitude of the applied current.

[0016] In an alternative embodiment, the three-way proportional flow valve has a first oil passage, a second oil passage and a third oil passage;

[0017] The inlet of the first oil passage and the inlet of the third oil passage are both connected to the inlet;

[0018] The outlet of the first oil passage is connected to the inlet of the second oil passage;

[0019] Wherein, the first oil passage can change its own flow rate according to the magnitude of the applied current; the flow ratio between the second oil passage and the third oil passage can be adjusted according to the flow rate of the first oil passage;

[0020] During the process of gradually decreasing the flow rate of the first oil passage, the flow rate of the second oil passage gradually decreases, and the flow rate of the third oil passage gradually increases;

[0021] During the process of gradually increasing the flow rate of the first oil passage, the flow rate of the second oil passage gradually increases, and the flow rate of the third oil passage gradually decreases.

[0022] In an alternative embodiment, the hydraulic control system further includes a second hydraulic valve group, and the second hydraulic valve group includes a first reversing valve and a second reversing valve;

[0023] The inlet of the first reversing valve and the inlet of the second reversing valve are both connected to the second outlet, the outlet of the first reversing valve is connected to the swing motor, and the outlet of the second reversing valve is connected to the pitching oil cylinder.

[0024] In an alternative embodiment, the first reversing valve and / or the second reversing valve is a three-position four-way solenoid valve. When the three-position four-way solenoid valve is in the neutral position, the three-position four-way solenoid valve can lead the hydraulic oil flowing out of the second outlet to the downstream side of the water pump motor.

[0025] In an alternative embodiment, the second hydraulic valve group further includes a first one-way throttle valve and / or a second one-way throttle valve with adjustable flow rate. The first one-way throttle valve is connected between the outlet of the first reversing valve and the swing motor, and the second one-way throttle valve is connected between the outlet of the second reversing valve and the pitching oil cylinder.

[0026] In an alternative embodiment, the hydraulic control system further includes a second oil pump and a fan motor connected to form a closed hydraulic circuit.

[0027] In an alternative embodiment, the first oil pump is a gear pump, the second oil pump is a piston pump, the piston pump is used to connect to the engine of the dust suppression vehicle, and the gear pump is connected in series to the output shaft of the piston pump.

[0028] In a second aspect, the present invention provides a hydraulic control method applied to the hydraulic control system according to any one of the foregoing embodiments. The method includes:

[0029] Obtain a user instruction;

[0030] Determine the working condition type according to the user instruction, where the working condition type includes a spray start / stop working condition and / or a spray water volume gear working condition;

[0031] If it is a spray start / stop working condition, control the flow rate at the first outlet to increase uniformly to the initial gear flow rate or decrease uniformly to zero;

[0032] If it is a spray water volume gear working condition, control the flow rate at the first outlet to switch to the first gear flow rate or the second gear flow rate, where the first gear flow rate is less than the second gear flow rate.

[0033] In a third aspect, the present invention provides a dust suppression vehicle including the hydraulic control system according to any one of the foregoing embodiments.

[0034] Compared with the prior art, the beneficial effects of the embodiments of the present application include, for example:

[0035] Since the inlet of the first hydraulic valve group can be communicated with at least one of the first outlet and the second outlet, the hydraulic oil delivered when the first oil pump works can drive the water pump motor, the swing motor and the pitching oil cylinder to work simultaneously, so as to realize the simultaneous spraying and the action of the cannon barrel, and moreover, the number of oil pumps is reduced and the cost is lowered. Among them, since the flow rate ratio between the first outlet and the second outlet can be adjusted, the flow rate of the first outlet and the flow rate of the second outlet can be flexibly distributed. When the flow rate of the first outlet increases, the flow rate of the second outlet decreases accordingly, so as to realize the flexible adjustment of the rotational speed of the water pump motor and adapt to more working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 This is the hydraulic circuit schematic diagram of the hydraulic control system according to the embodiment of the present application;

[0038] Figure 2 This is the schematic diagram of the functional modules of the hydraulic control system according to the embodiment of the present application.

[0039] Icons: 100 - First oil pump; 110 - First hydraulic valve group; 111 - Three-way proportional flow valve; 112 - Relief valve; 113 - Inlet; 114 - First outlet; 115 - Second outlet; 116 - First oil circuit; 117 - Second oil circuit; 118 - Third oil circuit; 119 - First valve section; 120 - Second valve section; 130 - Water pump motor; 140 - Swing motor; 150 - Pitch cylinder; 160 - Second hydraulic valve group; 161 - First reversing valve; 162 - Second reversing valve; 163 - First one-way throttle valve; 164 - Second one-way throttle valve; 200 - Second oil pump; 201 - Output shaft; 210 - Fan motor; 300 - Engine. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0044] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0045] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, terms such as "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0046] The following will describe in detail some embodiments of the present application with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0047] Reference Figure 1 and Figure 2 , an embodiment of the present application discloses a hydraulic control system, which is mainly applied to a dust suppression vehicle. The hydraulic control system includes a first oil pump 100, a first hydraulic valve group 110, a water pump motor 130, a swing motor 140, and a pitching oil cylinder 150;

[0048] The first hydraulic valve group 110 has an inlet 113, a first outlet 114, and a second outlet 115. The inlet 113 is connected to the first oil pump 100, and the inlet 113 can be selectively communicated with at least one of the first outlet 114 and the second outlet 115. Among them, the flow ratio between the first outlet 114 and the second outlet 115 can be adjusted, that is, the flow rate q of the inlet 113 = a + b, where a is the flow rate of the first outlet 114 and b is the flow rate of the second outlet 115. Therefore, when q is kept constant, when a increases, b must decrease, and the change amount of a and the change amount of b are exactly the same.

[0049] The water pump motor 130 is connected to the first outlet 114;

[0050] The second outlet 115 is connected to both the swing motor 140 and the pitch cylinder 150.

[0051] In this embodiment, since the inlet 113 of the first hydraulic valve group 110 can be communicated with at least one of the first outlet 114 and the second outlet 115, the hydraulic oil delivered when the first oil pump 100 works can drive the water pump motor 130, the swing motor 140 and the pitch cylinder 150 to work simultaneously, so as to realize the simultaneous spraying and barrel movement, and reduce the number of oil pumps and the cost. Among them, since the flow ratio between the first outlet 114 and the second outlet 115 can be adjusted, the flow of the first outlet 114 and the flow of the second outlet 115 can be flexibly allocated. When the flow of the first outlet 114 increases, the flow of the second outlet 115 decreases correspondingly, so as to realize the flexible adjustment of the rotational speed of the water pump motor 130 and adapt to more working conditions.

[0052] It can be understood that the inlet 113 can be selectively communicated with at least one of the first outlet 114 and the second outlet 115, which means that the inlet 113 can be only communicated with the first outlet 114. At this time, the first outlet 114 is fully open and the flow is the largest, the rotational speed of the water pump motor 130 is the largest, the flow of the second outlet 115 is zero, and the swing motor 140 and the pitch cylinder 150 stop; it can also be that the inlet 113 is only communicated with the second outlet 115. At this time, the flow of the first outlet 114 is zero, the water pump motor 130 stops, the second outlet 115 is fully open and the flow is the largest, and the swing motor 140 and the pitch cylinder 150 can operate; it can also be that the inlet 113 is communicated with both the first outlet 114 and the second outlet 115. At this time, hydraulic oil passes through both the first outlet 114 and the second outlet 115 to achieve the purpose of driving the water pump motor 130, the swing motor 140 and the pitch cylinder 150 to work.

[0053] In this embodiment, the first hydraulic valve group 110 includes a three-way proportional flow valve 111 and a relief valve 112;

[0054] The three-way proportional flow valve 111 has an inlet 113, a first outlet 114 and a second outlet 115. The inlet 113 and the inlet of the relief valve 112 are both connected to the first oil pump 100;

[0055] Among them, the three-way proportional flow valve 111 is driven electromagnetically to be able to change the flow ratio between the first outlet 114 and the second outlet 115 by changing the magnitude of the loaded current.

[0056] In this way, the pressure of the pipeline can be ensured to be stable by the overflow valve 112, so as to ensure the stability of the flow rate and pressure of the hydraulic oil delivered to the three-way proportional flow valve 111. When operating the three-way proportional flow valve 111 driven by electromagnetic force, only the magnitude of the current needs to be changed to adjust the ratio of the flow rate of the first outlet 114 to the flow rate of the second outlet 115. Since the magnitude of the current signal directly affects the magnetic force generated by the electromagnet and the spool displacement has a linear relationship with the signal value, continuous and precise adjustment of the flow rate can be achieved.

[0057] Specifically, the three-way proportional flow valve 111 has a first oil passage 116, a second oil passage 117 and a third oil passage 118;

[0058] The inlet of the first oil passage 116 and the inlet of the third oil passage 118 are both connected to the inlet 113;

[0059] The outlet of the first oil passage 116 is connected to the inlet of the second oil passage 117;

[0060] Among them, the first oil passage 116 can change its own flow rate according to the magnitude of the applied current; the flow rate ratio between the second oil passage 117 and the third oil passage 118 can be adjusted according to the flow rate of the first oil passage 116;

[0061] When the first oil passage 116 is blocked, the second oil passage 117 is blocked and the third oil passage 118 is fully open;

[0062] When the first oil passage 116 is fully open, the second oil passage 117 is fully open and the third oil passage 118 is blocked;

[0063] During the process of the first oil passage 116 switching from fully open to blocked, the second oil passage 117 gradually switches from fully open to blocked, and the third oil passage 118 gradually switches from blocked to fully open; therefore, during the process of the flow rate of the first oil passage 116 gradually decreasing, the flow rate of the second oil passage 117 gradually decreases and the flow rate of the third oil passage 118 gradually increases.

[0064] During the process of the first oil passage 116 switching from blocked to fully open, the second oil passage 117 gradually switches from blocked to fully open, and the third oil passage 118 gradually switches from fully open to blocked. Therefore, during the process of the flow rate of the first oil passage 116 gradually increasing, the flow rate of the second oil passage 117 gradually increases and the flow rate of the third oil passage 118 gradually decreases.

[0065] In this way, the flow rate of the first outlet 114 can be preferentially controlled by the magnitude of the applied current. As the current YV01 applied to the three-way proportional flow valve 111 increases, the output flow rate of the first outlet 114 will also increase, and the remaining hydraulic oil output by the first oil pump 100 is output through the second outlet 115. The output flow rate of the first outlet 114 is used to drive the water pump motor 130 to rotate, and the output flow rate of the second outlet 115 drives the swing motor 140 and the pitching oil cylinder 150 to act.

[0066] Combined Figure 1 The symbol of the three-way proportional flow valve 111 will be described. That is, the three-way proportional flow valve 111 includes a first valve part 119 and a second valve part 120. The first valve part 119 has a first oil passage 116, and the second valve part 120 has a second oil passage 117 and a third oil passage 118. The first valve part 119 determines whether it is in the left position, the right position, or between the left and right positions by the magnitude of the applied current, so as to change the flow rate of the first oil passage 116. The second valve part 120 determines whether it is in the left position, the right position, or between the left and right positions by the flow rate of the first oil passage 116, so as to change the flow rate ratio between the first outlet 114 and the second outlet 115.

[0067] When the applied current gradually decreases from the maximum value to zero, the first valve part 119 gradually switches from the left position to the right position, and the flow rate of the first oil passage 116 gradually decreases from the maximum to zero, corresponding to gradually switching from fully open to blocked. During this process, the hydraulic oil output by the first oil pump 100 reaches the right side of the second valve part 120 more than the left side of the second valve part 120. Therefore, the pressure on the right side of the second valve part 120 is greater than the pressure on the left side, and the second valve part 120 will gradually switch from the left position to the right position. The flow rate of the second oil passage 117 gradually decreases from the maximum to zero, and the flow rate of the third oil passage 118 gradually increases from zero to the maximum. In this way, the water pump motor 130 gradually decelerates until it stops, and the flow rate of the second outlet 115 gradually increases from zero to the maximum.

[0068] When the applied current gradually increases from zero to the maximum value, the first valve part 119 gradually switches from the right position to the left position, and the flow rate of the first oil passage 116 gradually increases from zero to the maximum value, corresponding to gradually switching from blocked to fully open. During this process, the hydraulic oil output by the first oil pump 100 reaches the left side of the second valve part 120 more than the right side of the second valve part 120. Therefore, the pressure on the left side of the second valve part 120 is greater than the pressure on the right side, and the second valve part 120 will gradually switch from the right position to the left position. The flow rate of the second oil passage 117 gradually increases from zero to the maximum value, and the flow rate of the third oil passage 118 gradually decreases from the maximum value to zero. In this way, the water pump motor 130 starts from a stop and gradually accelerates to the maximum speed, and the flow rate of the second outlet 115 gradually decreases from the maximum value to zero.

[0069] Exemplarily, the working conditions during the actual use of the water pump motor 130 include the following two types:

[0070] 1) Start and stop

[0071] During the startup phase of the water pump motor 130, the current YV01 on the three-way proportional flow valve 111 is controlled to increase uniformly at a set slope, so that the flow rate output from the first outlet 114 can increase uniformly, and then the water pump motor 130 can be slowly started to a higher speed. During the stop phase of the water pump, the current YV01 on the three-way proportional flow valve 111 is controlled to decrease uniformly at a set slope, so that the flow rate output from the first outlet 114 can decrease uniformly, and then the water pump motor 130 can be slowly stopped. By controlling the start and stop of the water pump motor 130 in the above manner, the load impact can be reduced, and the reliability and service life of the hydraulic system can be improved.

[0072] 2) Generally, the dust suppression vehicle is provided with two spray rings, an inner one and an outer one. When one spray ring or two spray rings are opened, if the atomization effects are the same, the required spray water volumes are different, that is, the rotational speeds of the water pump motor 130 are different. In this solution, when the driver performs a single-ring spraying operation, the current YV01 on the three-way proportional flow valve 111 is loaded to a certain lower value, and the water pump motor 130 operates at a certain lower constant speed; when the driver performs a double-ring spraying operation, the current YV01 on the three-way proportional flow valve 111 is loaded to a certain higher value, and the water pump motor 130 operates at a certain higher constant speed. By controlling the rotational speed of the water pump motor 130 in the above manner, it can be ensured that the water mist effects during single-ring spraying and double-ring spraying are the same, and the working condition adaptability is good; at the same time, during single-ring spraying, the water pump operates at a lower speed, the system is more energy-saving, and the fuel consumption is lower.

[0073] In order to facilitate the regulation and control of the rotation direction of the swing motor 140 and the displacement direction of the piston rod of the pitching cylinder 150, in this embodiment, the hydraulic control system further includes a second hydraulic valve group 160, and the second hydraulic valve group 160 includes a first reversing valve 161 and a second reversing valve 162;

[0074] The inlet 113 of the first reversing valve 161 and the inlet 113 of the second reversing valve 162 are both connected to the second outlet 115, the outlet of the first reversing valve 161 is connected to the swing motor 140, and the outlet of the second reversing valve 162 is connected to the pitching cylinder 150.

[0075] Specifically, the first reversing valve 161 and / or the second reversing valve 162 is a three-position four-way solenoid valve. When the first reversing valve 161 is in the left position, the swing motor 140 rotates forward; when the first reversing valve 161 is in the right position, the swing motor 140 rotates in reverse. When the second reversing valve 162 is in the left position, the pitching cylinder 150 drives the barrel to raise (or lower); when the second reversing valve 162 is in the right position, the pitching cylinder 150 drives the barrel to lower (or raise).

[0076] Among them, when the three-position four-way solenoid valve is in the neutral position, that is, when both the first reversing valve 161 and the second reversing valve 162 are in the neutral position, the three-position four-way solenoid valve can lead the hydraulic oil flowing out of the second outlet 115 to the downstream side of the water pump motor 130, and after converging with the hydraulic oil on the downstream side of the water pump motor 130, it is recycled to the fuel tank. At this time, the hydraulic oil will not be delivered to the swing motor 140 and the pitching cylinder 150, so both the swing motor 140 and the pitching cylinder 150 stop running.

[0077] The second hydraulic valve group 160 further includes a first one-way throttle valve 163 / or a second one-way throttle valve 164 with adjustable flow rate. The first one-way throttle valve 163 is connected between the outlet of the first reversing valve 161 and the swing motor 140, so as to adjust the running speed of the swing motor 140. The second one-way throttle valve 164 is connected between the outlet of the second reversing valve 162 and the pitching cylinder 150, so as to adjust the running speed of the pitching cylinder 150.

[0078] In addition, in this embodiment, the hydraulic control system further includes a second oil pump 200 and a fan motor 210 connected in a closed hydraulic circuit, and the second oil pump 200 can drive the fan to rotate.

[0079] Among them, the first oil pump 100 is a piston pump, and the second oil pump 200 is a gear pump. The piston pump is used to connect with the engine 300 of the dust suppression vehicle, and the gear pump is connected in series on the output shaft 201 of the piston pump. In this way, the first oil pump 100 and the second oil pump 200 are connected in series, and the first oil pump 100 and the second oil pump 200 can be driven to run simultaneously by one driving source, reducing auxiliary equipment and cost. Moreover, the piston pump can adjust the output displacement, and further adjust the output speed of the fan.

[0080] Of course, it can be understood that the control of the above-mentioned solenoid valves, oil pumps, water pumps, cylinders and fans is realized through a controller, and the controller can be the vehicle controller of the dust suppression vehicle or a chip electrically connected to the vehicle controller.

[0081] It should be noted that the above-mentioned controller is usually a Central Processing Unit (CPU), and corresponding operating systems, control interfaces, etc. can be configured. Specifically, it can be a digital logic control unit such as a single-chip microcomputer, DSP (Digital Signal Processing), ARM (Advanced RISC Machines, ARM processor), etc. that can be used for automatic control. The control instructions can be loaded into the memory for storage and execution at any time. At the same time, CPU instructions, data memory, input / output units, power modules, digital-to-analog units, etc. can be built in, and specific settings can be made according to actual usage situations. The embodiments of the present application do not limit this.

[0082] The embodiment of the present application also discloses a hydraulic control method, which is applied to the hydraulic control system of the above embodiment. This method can be stored in the controller in the form of program segments and can be read, written, and executed by the controller. It should be noted that the steps of this method can be executed in a computer system such as a set of computer-executable instructions. And although S1-S4 show a logical order in terms of the appearance sequence, in some cases, the steps shown or described can be executed in a different order from here. The specific process of this method will be elaborated in detail below.

[0083] The method includes the following steps S1-S4:

[0084] Step S1, obtain a user instruction;

[0085] Step S2, determine the working condition type according to the user instruction, where the working condition type includes spray start / stop working condition and / or spray water volume gear working condition;

[0086] Step S3, if it is the spray start / stop working condition, then control the flow rate of the first outlet 114 to increase uniformly to the initial gear flow rate or decrease uniformly to zero;

[0087] That is to say, during the starting stage of the water pump motor 130, control the current YV01 on the three-way proportional flow valve 111 to increase uniformly according to the set slope, which can realize the uniform increase of the flow rate output by the first outlet 114, and then the water pump motor 130 starts slowly to a higher speed. During the stopping stage of the water pump, control the current YV01 on the three-way proportional flow valve 111 to decrease uniformly according to the set slope, which can realize the uniform decrease of the flow rate output by the first outlet 114, and then the water pump motor 130 stops slowly. By controlling the start and stop of the water pump motor 130 in the above manner, the load impact can be reduced, and the reliability and service life of the hydraulic system can be improved.

[0088] Step S4, if it is the spray water volume gear working condition, then control the flow rate of the first outlet 114 to switch to the first gear flow rate or the second gear flow rate, where the first gear flow rate is less than the second gear flow rate.

[0089] That is to say, a dust suppression vehicle is generally provided with two spray rings, namely an inner spray ring and an outer spray ring. When one spray ring or two spray rings are opened, if the atomization effects are to be the same, the required spray water volumes are different, that is, the rotational speeds of the water pump motor 130 are different. In this solution, when the driver performs a single-ring spraying operation, the current YV01 on the three-way proportional flow valve 111 is loaded with a certain lower value, and the water pump motor 130 operates at a certain lower constant rotational speed; when the driver performs a double-ring spraying operation, the current YV01 on the three-way proportional flow valve 111 is loaded with a certain higher value, and the water pump motor 130 operates at a certain higher constant rotational speed. By controlling the rotational speed of the water pump motor 130 in the above manner, it can be ensured that the water mist effects during single-ring spraying and double-ring spraying are the same, and the working condition adaptability is good; at the same time, during single-ring spraying, the water pump operates at a lower rotational speed, the system is more energy-efficient, and the fuel consumption is lower.

[0090] In addition, the embodiment of the present application also discloses a dust suppression vehicle, which includes the hydraulic control system of the above embodiment, and thus also has corresponding structures and beneficial effects, which will not be elaborated here.

[0091] In summary, the embodiments of the present application have at least the following advantages compared with the prior art:

[0092] 1. The hydraulic pump set of this solution is composed of a plunger pump and a gear pump connected in series. The components are simple, the required installation space is small, and it is convenient for installation and maintenance.

[0093] 2. The hydraulic pump set of this solution is simple, the hydraulic pipeline is simple, and the hydraulic valve set costs less than the load-sensitive multi-way valve. The overall solution has good economy.

[0094] 3. This solution performs ramp control on the start and stop of the spray water pump, effectively improving the reliability and service life of the hydraulic system and the water pipeline system.

[0095] 4. This solution performs different water pump rotational speed controls on single-ring spraying and double-ring spraying, has good working condition adaptability, and the system is more energy-efficient.

[0096] 5. This solution can manually adjust the speeds of the gun barrel swing and the gun barrel pitch according to requirements.

[0097] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic control system for a dust suppression vehicle, characterized in that, It includes a first oil pump (100), a first hydraulic valve group (110), a water pump motor (130), a swing motor (140), and a pitching oil cylinder (150); The first hydraulic valve group (110) has an inlet (113), a first outlet (114), and a second outlet (115). The inlet (113) is connected to the first oil pump (100), and the inlet (113) can be selectively communicated with at least one of the first outlet (114) and the second outlet (115). Among them, the flow ratio between the first outlet (114) and the second outlet (115) can be adjusted; The water pump motor (130) is connected to the first outlet (114); The second outlet (115) is connected to both the swing motor (140) and the pitching oil cylinder (150).

2. The hydraulic control system according to claim 1, characterized in that, The first hydraulic valve group (110) includes a three-way proportional flow valve (111) and a relief valve (112); The three-way proportional flow valve (111) has the inlet (113), the first outlet (114), and the second outlet (115). The inlet (113) and the inlet of the relief valve (112) are both connected to the first oil pump (100); Among them, the three-way proportional flow valve (111) is electromagnetically driven to be able to change the flow ratio between the first outlet (114) and the second outlet (115) by changing the magnitude of the applied current.

3. The hydraulic control system according to claim 2, characterized in that, The three-way proportional flow valve (111) has a first oil passage (116), a second oil passage (117), and a third oil passage (118); The inlets of the first oil passage (116) and the third oil passage (118) are both communicated with the inlet (113); The outlet of the first oil passage (116) is communicated with the inlet of the second oil passage (117); Among them, the first oil passage (116) can change its own flow according to the magnitude of the applied current; the flow ratio between the second oil passage (117) and the third oil passage (118) can be adjusted according to the flow of the first oil passage (116); During the process of the flow of the first oil passage (116) gradually decreasing, the flow of the second oil passage (117) gradually decreases, and the flow of the third oil passage (118) gradually increases; During the process of the flow of the first oil passage (116) gradually increasing, the flow of the second oil passage (117) gradually increases, and the flow of the third oil passage (118) gradually decreases.

4. The hydraulic control system according to claim 1, characterized in that, The hydraulic control system further includes a second hydraulic valve group (160). The second hydraulic valve group (160) includes a first reversing valve (161) and a second reversing valve (162); The inlet (113) of the first reversing valve (161) and the inlet (113) of the second reversing valve (162) are both connected to the second outlet (115). The outlet of the first reversing valve (161) is connected to the swing motor (140), and the outlet of the second reversing valve (162) is connected to the pitching oil cylinder (150).

5. The hydraulic control system according to claim 4, characterized in that, The first reversing valve (161) and / or the second reversing valve (162) is a three-position four-way solenoid valve. When the three-position four-way solenoid valve is in the neutral position, the three-position four-way solenoid valve can direct the hydraulic oil flowing out of the second outlet (115) to the downstream side of the water pump motor (130).

6. The hydraulic control system according to claim 4 or 5, characterized in that The second hydraulic valve group (160) further includes a first one-way throttle valve (163) and / or a second one-way throttle valve (164) with adjustable flow rate. The first one-way throttle valve (163) is connected between the outlet of the first reversing valve (161) and the swing motor (140), and the second one-way throttle valve (164) is connected between the outlet of the second reversing valve (162) and the pitching oil cylinder (150).

7. The hydraulic control system according to claim 1, characterized in that, The hydraulic control system further includes a second oil pump (200) and a fan motor (210) connected to form a closed hydraulic circuit.

8. The hydraulic control system according to claim 7, characterized in that, The first oil pump (100) is a gear pump, the second oil pump (200) is a piston pump, the piston pump is used to connect to the engine (300) of the dust suppression vehicle, and the gear pump is connected in series on the output shaft (201) of the piston pump.

9. A hydraulic control method, applied to the hydraulic control system according to any one of claims 1-8, characterized in that, The method includes: Obtaining a user instruction; Determining the working condition type according to the user instruction, where the working condition type includes a spray start / stop working condition and / or a spray water volume gear working condition; If it is a spray start / stop working condition, controlling the flow rate of the first outlet (114) to increase uniformly to the initial gear flow rate or decrease uniformly to zero; If it is a spray water volume gear working condition, controlling the flow rate of the first outlet (114) to switch to the first gear flow rate or the second gear flow rate, where the first gear flow rate is less than the second gear flow rate.

10. A dust suppression vehicle, characterized in that, Comprising the hydraulic control system according to any one of claims 1-8.

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