CN113019027A - Waterway control system and method for dust suppression vehicle - Google Patents
Waterway control system and method for dust suppression vehicle Download PDFInfo
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- CN113019027A CN113019027A CN202011489238.7A CN202011489238A CN113019027A CN 113019027 A CN113019027 A CN 113019027A CN 202011489238 A CN202011489238 A CN 202011489238A CN 113019027 A CN113019027 A CN 113019027A
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Abstract
The invention discloses a waterway control system and a waterway control method for a dust suppression vehicle, wherein the system comprises an oil tank, an oil pump, a proportional control valve, a motor, a water cooler, a water pump, a water tank, a wind gun nozzle ring, a sensor and a central controller, an oil outlet of the oil tank is sequentially connected with a hydraulic oil inlet of the oil pump, the proportional control valve, the motor and a water cooler through pipelines, and a hydraulic oil outlet of the water cooler is connected with an oil return port of the oil tank through a pipeline; the power input end of the water pump is in driving connection with the power output end of the motor; the water outlet of the water tank is connected with the water inlet of the water pump through a pipeline, the water outlet of the water pump is respectively connected with the nozzle rings of the air cannons through corresponding pneumatic stop valves, the water outlet of the water pump is also connected with the cooling water inlet of the water cooler through an electric proportional valve, and the cooling water outlet of the water cooler is connected with the water return port of the water tank through a pipeline. The invention saves energy, reduces consumption, prolongs the service life of the hydraulic system and ensures the optimal spraying effect.
Description
Technical Field
The invention relates to the technical field of dust suppression vehicles, in particular to a dust suppression vehicle waterway control system and method.
Background
The main action of the dust suppression vehicle is to spray and suppress dust, so the waterway control system is one of the most critical systems of the dust suppression vehicle. The spraying operation is supplied with water by a water pump, and the water pump is driven in various ways at present, namely directly driven by an auxiliary engine and a motor, driven by a chassis power takeoff and driven by a hydraulic system. Since now, dust suppression vehicle products are still short for ten years, and the waterway control mode is also relatively extensive.
The existing water path control mode of the dust suppression vehicle aims at realizing functions, and a fine water path control scheme is not provided, for example, the rotating speed of a spray water pump is usually kept constant, the required driving power is almost unchanged, and a water path system is not provided with a sensing element for detecting water pressure. In the scheme that a hydraulic system drives a water pump, cooling of the hydraulic system, temperature detection of hydraulic oil, a specific hydraulic oil cooling control scheme and the like are not considered in most cases, and the following defects and problems are brought about by the arrangement:
1. the hydraulic system is low in working efficiency, and hydraulic elements are easy to age, damage and the like.
2. The rotating speed of the spray water pump is constant or the spray water pump is manually adjusted by a driver, the spray water pump cannot automatically change along with the change of working conditions, the water pressure at the nozzle of the air cannon is easy to change frequently, and the spray effect is poor.
3. The water output of the water pump cannot be automatically matched with the working condition, and the condition of overlarge water output is easy to occur, so that energy loss is caused.
Disclosure of Invention
The invention provides a waterway control system of a dust suppression vehicle, which aims to solve the technical problems that hydraulic elements of the waterway control system of the existing dust suppression vehicle are easy to age and damage, the water pressure at a nozzle is unstable and the energy loss is large.
The technical scheme adopted by the invention is as follows:
a dust suppression vehicle waterway control system, comprising:
the oil outlet of the oil tank is sequentially connected with the oil pump, the proportional control valve, the motor and a hydraulic oil inlet of the water cooler through pipelines, and a hydraulic oil outlet of the water cooler is connected with an oil return port of the oil tank through a pipeline;
the power input end of the water pump is in driving connection with the power output end of the motor;
the water outlet of the water tank is connected with the water inlet of the water pump through a pipeline, the water outlet of the water pump is respectively connected with the air cannon nozzle ring through a corresponding pneumatic cut-off valve, the water outlet of the water pump is also connected with the cooling water inlet of the water cooler through an electric proportional valve, and the cooling water outlet of the water cooler is connected with the water return port of the water tank through a pipeline;
the rotating speed sensor is arranged on the power output end of the motor and used for detecting the rotating speed of the water pump;
the water pressure sensor is arranged at a water outlet of the water pump and used for detecting the output water pressure of the water pump;
the oil temperature sensors are respectively arranged at a hydraulic oil inlet and a hydraulic oil outlet of the water cooler and are used for respectively detecting the temperature of hydraulic oil flowing into and out of the water cooler;
and the central controller is in signal connection with the proportional control valve, the rotating speed sensor, the water pressure sensor, the oil temperature sensor, the electric proportional valve and each pneumatic cut-off valve respectively, and is used for sending corresponding control signals to the proportional control valve and the electric proportional valve in real time according to the operation working condition of the nozzle ring of the air cannon, the measured hydraulic oil temperature, the measured water pressure and the water pump rotating speed, so that the temperature of the hydraulic oil and the water pump output water pressure are positioned in corresponding safety setting range values.
And the sound and light alarm system is in signal connection with the central controller and is used for sending corresponding warning information when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold value.
The invention also provides a dust suppression vehicle waterway control method, and the dust suppression vehicle waterway control system comprises the following steps:
after the spraying operation is started, the central controller respectively sends control signals YV1 and DT to the proportional control valve and the corresponding pneumatic stop valve, opens the proportional control valve and the corresponding pneumatic stop valve, and then obtains the output water pressure of the water pump and the temperature of hydraulic oil flowing into and out of the water cooler;
if the output water pressure is within the safe set range value, the central controller outputs the control signal YV1 with the constant value to keep the rotating speed of the motor and the water pump stable, otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV1 to correspondingly increase or decrease the value of the control signal YV1 and then keep the rotating speed of the motor and the water pump stable;
if the temperature of the hydraulic oil flowing into the water cooler reaches a set threshold value, the central controller outputs a control signal YV2 to the electric proportional water valve to open the electric proportional water valve, and then a part of the water discharged by the water pump flows into the water cooler to cool the hydraulic oil.
Further, when the hydraulic oil is cooled, if the temperature of the hydraulic oil flowing out of the water cooler is within the safety set range value, the value of the control signal YV2 output by the central controller is kept unchanged, otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV2, so that the value of the control signal YV2 is correspondingly increased or decreased, the opening degree of the electric proportional water valve is increased or decreased, and the temperature of the hydraulic oil flowing out of the water cooler is ensured to be within the safety set range value.
Further, if the control signal YV1 is subjected to positive feedback or negative feedback regulation by the central controller, the value of the control signal YV1 is correspondingly increased or decreased, and the rotation speeds of the motor and the water pump are kept stable, specifically including the steps of:
when the operation mode is single-ring spraying, the feedback adjustment quantity of the control signal YV1 is set to be delta YV1, wherein the adjustment frequency of delta YV1 is that the water pump output water pressure is detected once per second, the value of the control signal YV1 is subjected to feedback adjustment once according to the detection result, and the specific value of delta YV1 is calculated according to the following formula:
wherein N is an ideal value of the water pressure output by the water pump.
Further, when the operation mode is changed from the single-ring spray to the double-ring spray or from the double-ring spray to the single-ring spray, the control signal YV1 is increased or decreased by a set value, and then feedback adjustment is performed according to the single-ring spray operation mode.
Further, if the difference is not, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV2, so that the value of the control signal YV2 is correspondingly increased or decreased, and then the opening of the electric proportional water valve is increased or decreased, so as to ensure that the temperature of the hydraulic oil flowing out of the water cooler is within the safety set range value, specifically comprising the steps of:
if the temperature of the hydraulic oil flowing out of the water cooler is larger than the upper limit of the safety set range value, the central controller performs positive feedback adjustment on a control signal YV2, the value of the control signal YV2 is increased, the opening of the electric proportional water valve is increased, the amount of water entering the water cooler is increased, so that the temperature of the hydraulic oil flowing out of the water cooler is reduced to be within the safety set range value, meanwhile, the central controller immediately performs positive feedback adjustment on the control signal YV1, the rotating speed of the water pump is increased, and the output water pressure is increased until the output water pressure of the water pump is stabilized to be within the safety set range value;
if the temperature of the hydraulic oil flowing out of the water cooler is smaller than the lower limit of the safety set range value, the central controller performs negative feedback adjustment on the control signal YV2, the value of the control signal YV2 is reduced, the opening of the electric proportional water valve is reduced, and the water quantity entering the water cooler is reduced, so that the temperature of the hydraulic oil flowing out of the water cooler is increased to the safety set range value, meanwhile, the central controller performs negative feedback adjustment on the control signal YV1 immediately, the rotating speed of the water pump is reduced, and the output water pressure is reduced until the output water pressure of the water pump is stabilized in the safety set range value.
Further, if the control signal YV2 is in positive feedback or negative feedback adjustment, the central controller correspondingly increases or decreases the value of the control signal YV2, and the method specifically includes the following steps:
setting the feedback adjustment quantity of the control signal YV2 as delta YV2, wherein the feedback adjustment rate of delta YV2 is set to detect the temperature of the hydraulic oil flowing out of the water cooler once every 5 seconds, and performing feedback adjustment on the control signal YV2 according to the detection result, and the specific value of delta YV2 is calculated according to the following formula:
and M is an ideal temperature value of the hydraulic oil flowing out of the water cooler.
Further, the method also comprises the following steps:
and when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold value, corresponding warning information is sent out.
Further, when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold value, corresponding warning information is sent, and the method specifically comprises the following steps:
when the control signal YV1 is loaded to the maximum upper limit value set by the system and the detection values of the water pump output water pressure for a plurality of times are all smaller than the lower limit value of the safety setting range value, corresponding warning information is sent out;
when the control signal YV1 is loaded to the minimum lower limit value set by the system and the detection values of the water pressure output by the water pump for a plurality of times are all larger than the upper limit value of the safety setting range value, corresponding warning information is sent out;
when the detection values of the water pump rotating speed for a plurality of times are all larger than the upper limit, the central controller judges that the water pump is overspeed and sends out corresponding warning information, if the working condition that the water pump is overspeed is warned to exceed the set time and the driver still does not carry out effective control operation, the central controller stops outputting a control signal YV1 to stop the motor and the water pump from running;
when the control signal YV2 is loaded to the maximum upper limit value set by the system and the detected values of the temperature of the hydraulic oil flowing out of the water cooler for a plurality of times are all larger than the upper limit value of the safety set range, corresponding warning information is sent out, if a driver does not carry out effective control operation, the temperature of the hydraulic oil flowing out of the water cooler is continuously increased to the set value, corresponding warning information is sent out, meanwhile, the central controller stops outputting DT signals to each pneumatic cut-off valve, and spraying operation is stopped;
when the control signal YV2 is loaded to the minimum lower limit value set by the system, and the detected values of the temperature of the hydraulic oil flowing out of the water cooler for a plurality of times are all smaller than the lower limit value of the safety set range, corresponding warning information is sent out.
The invention has the following beneficial effects:
according to the dust suppression vehicle waterway control system and method provided by the invention, the rotation speed of the water pump and the water amount entering the water cooler are subjected to closed-loop control by arranging the central controller, the proportional control valve, the water pressure sensor, the rotation speed sensor, the oil temperature sensor and the like, so that the rotation speed of the water pump and the water amount entering the water cooler are subjected to feedback regulation respectively based on the change of the pressure at the water outlet of the water pump and the temperature of cooled hydraulic oil, and therefore, the spraying waterway can be utilized to cool the hydraulic system, the working efficiency of the hydraulic system is improved, and the service life of the hydraulic system is prolonged; the pressure of the spraying water path can be controlled in a feedback manner, so that the pressure of the spraying water path is always maintained in a reasonable range, and the optimal spraying effect is ensured; the water quantity entering the water cooler can be subjected to feedback control, and the temperature of the cooled hydraulic oil is always kept in an optimal working temperature range; the rotating speed of the water pump can be automatically adjusted according to the number of the spraying rings and the temperature of hydraulic oil, the driving power is automatically matched, and energy loss is avoided.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a waterway control system of a dust suppression vehicle in accordance with a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of the operation principle of the central controller according to the preferred embodiment of the present invention.
Fig. 3 is a flow chart of a waterway control method of the dust suppression vehicle according to the preferred embodiment of the invention.
Fig. 4 is a schematic view of a hydraulic control flow according to a preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of an oil temperature control flow path in accordance with a preferred embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, a preferred embodiment of the invention provides a waterway control system of a dust suppression vehicle, which comprises an oil tank, an oil pump, a proportional control valve, a motor, a water cooler, a water pump, a water tank, two air cannon nozzle rings, a rotating speed sensor, a water pressure sensor, an oil temperature sensor and a central controller.
The oil outlet of the oil tank is sequentially connected with an oil pump, a proportional control valve, a motor and a hydraulic oil inlet of a water cooler through pipelines, and a hydraulic oil outlet of the water cooler is connected with an oil return port of the oil tank through a pipeline;
the power input end of the water pump is in driving connection with the power output end of the motor;
the water outlet of the water tank is connected with the water inlet of the water pump through a pipeline, the water outlet of the water pump is respectively connected with the first air cannon nozzle ring and the second air cannon nozzle ring through a first pneumatic stop valve and a second pneumatic stop valve, the water outlet of the water pump is also connected with the cooling water inlet of the water cooler through an electric proportional valve, and the cooling water outlet of the water cooler is connected with the water return port of the water tank through a pipeline;
the rotating speed sensor is arranged on the power output end of the motor and used for detecting the rotating speed N1(rpm) of the water pump; the water pressure sensor is arranged at a water outlet of the water pump and used for detecting the output water pressure P1(MPa) of the water pump;
the oil temperature sensors comprise a first oil temperature sensor and a second oil temperature sensor which are respectively arranged at a hydraulic oil inlet and a hydraulic oil outlet of the water cooler and are used for respectively detecting the temperature T1 (DEG C) of hydraulic oil flowing into the water cooler and the temperature T2 (DEG C) of hydraulic oil flowing out of the water cooler;
the central controller adopts singlechip or PLC, respectively with proportional control valve, revolution speed sensor, water pressure sensor, oil temperature sensor, electric proportional valve, each pneumatic trip valve signal connection for according to the operation operating mode of wind big gun nozzle cascade, the hydraulic oil temperature that surveys, water pressure and water pump rotational speed to proportional control valve, electric proportional valve send corresponding control signal in real time, make the temperature of hydraulic oil, water pump output water pressure be located corresponding safe settlement scope value.
The dust suppression vehicle waterway control system of the embodiment performs closed-loop control on the rotation speed of the water pump and the water quantity entering the water cooler by arranging the central controller, the proportional control valve, the water pressure sensor, the rotation speed sensor, the oil temperature sensor and the like, so that the rotation speed of the water pump and the water quantity entering the water cooler are respectively subjected to feedback regulation on the basis of the change of the pressure at the water outlet of the water pump and the temperature of cooled hydraulic oil, therefore, the embodiment can utilize the spraying waterway to cool the hydraulic system, the working efficiency of the hydraulic system is improved, and the service life of the hydraulic system is prolonged; the pressure of the spraying water path can be controlled in a feedback manner, so that the pressure of the spraying water path is always maintained in a reasonable range, and the optimal spraying effect is ensured; the water quantity entering the water cooler can be subjected to feedback control, and the temperature of the cooled hydraulic oil is always kept in an optimal working temperature range; the rotating speed of the water pump can be automatically adjusted according to the number of the spraying rings and the temperature of hydraulic oil, the driving power is automatically matched, and energy loss is avoided.
In a preferred embodiment of the invention, the water way control system of the dust suppression vehicle further comprises an audible and visual alarm system which is in signal connection with the central controller and is used for sending corresponding warning information when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold value.
The dust suppression car water route control system of this embodiment possesses the unusual multiple alarming function of spraying water pressure, water pump overspeed and hydraulic oil temperature abnormity, and when the continuous warning of abnormal working condition, central controller can automatic execution protection operation, promotes the security and the robustness of system operation by a wide margin.
The waterway control system of the dust suppression vehicle of the embodiment is mainly divided into two parts: hydraulic control part and water route control part. The oil pump outputs pressure oil after sucking oil from the hydraulic oil tank, and the pressure oil enters the motor to drive the water pump to rotate after passing through the proportional control valve. And returning the motor oil to enter a water cooler for cooling, wherein a first oil temperature sensor is arranged at the inlet of the water cooler, a second oil temperature sensor is arranged at the outlet of the water cooler, the first oil temperature sensor records the temperature T1 (DEG C) of the hydraulic oil before cooling, and the second oil temperature sensor records the temperature T2 (DEG C) of the hydraulic oil after cooling. And the hydraulic oil flows back to the hydraulic oil tank after being cooled. The hydraulic control system is a load sensitive system, the output displacement of the oil pump can be adjusted by adjusting the control current of the proportional control valve, so that the rotating speeds of the motor and the water pump are adjusted, and finally the water yield of the water pump is adjusted. At the drive shaft of the motor driven water pump, a speed sensor is mounted for recording the water pump speed N1 (rpm).
The water pump is driven by the motor and outputs water flow to each air gun nozzle and the water cooler respectively. The outlet of the water pump is provided with a water pressure sensor which can detect the output water pressure P1 (MPa). In the nozzle ring branch of the wind cannon, the number of rings of the nozzle can be designed according to actual requirements, and the embodiment is described by taking two rings as an example. The first pneumatic cut-off valve is arranged in front of the first air cannon nozzle ring, and the opening and closing of the spraying action of the first air cannon nozzle ring can be realized by controlling the power on and power off of the first pneumatic cut-off valve. Similarly, the opening and closing of the spraying action of the nozzle ring of the second air cannon can be realized by controlling the power on and power off of the second pneumatic cut-off valve. In the branch of the water cooler, an electric proportional water valve is installed, and the amount of water entering the water cooler can be adjusted by changing the control current of the electric proportional water valve.
The central controller in the above embodiments is used to collect input signals of the water pressure sensor, the oil temperature sensors, and the rotation speed sensor, and output corresponding control signals to the proportional control valve, the pneumatic cut-off valve, and the electric proportional water valve after data analysis. In addition, the central controller can analyze the data of the collected signals, judge abnormal working conditions and start the sound and light alarm system if the judgment result is that the working conditions are abnormal.
As shown in fig. 3, another aspect of the present invention further provides a method for controlling a waterway of a dust suppression vehicle, based on the system for controlling a waterway of a dust suppression vehicle, including the steps of:
s1, after the spraying operation is started, the central controller respectively sends control signals YV1 and DT to the proportional control valve and the corresponding pneumatic stop valve, opens the proportional control valve and the corresponding pneumatic stop valve, and then obtains the output water pressure of the water pump and the temperature of hydraulic oil flowing into and out of the water cooler;
s2, if the output water pressure is within the safe set range, the central controller outputs a control signal YV1 with a constant value to keep the rotating speed of the motor and the water pump stable, otherwise, the central controller performs corresponding positive feedback or negative feedback regulation on the control signal YV1 to correspondingly increase or decrease the value of the control signal YV1 to keep the rotating speed of the motor and the water pump stable;
and S3, if the temperature of the hydraulic oil flowing into the water cooler reaches a set threshold value, the central controller outputs a control signal YV2 to the electric proportional water valve to open the electric proportional water valve, and then a part of the water discharged by the water pump flows into the water cooler to cool the hydraulic oil.
According to the dust suppression vehicle waterway control method, the rotating speed of the water pump and the water amount entering the water cooler are subjected to closed-loop control, so that the rotating speed of the water pump and the water amount entering the water cooler are subjected to feedback regulation respectively based on the change of the pressure of the water outlet of the water pump and the temperature of the cooled hydraulic oil, and therefore, on one hand, on the basis of not increasing the equipment cost much, the spraying waterway is utilized to cool the hydraulic system, the working efficiency of the hydraulic system is improved, and the service life of the hydraulic system is prolonged; on the other hand, the embodiment can realize the feedback control of the pressure of the spraying waterway, so that the pressure of the spraying waterway is always maintained in a reasonable range, and the optimal spraying effect is ensured; meanwhile, the embodiment can perform feedback control on the water quantity entering the water cooler, and ensure that the temperature of the cooled hydraulic oil is always maintained in the optimal working temperature range; finally, the rotating speed of the water pump can be automatically adjusted according to the number of the spraying rings and the temperature of the hydraulic oil, the driving power is automatically matched, the energy loss is avoided, the energy is saved, the environment is protected, and the operation time of the dust suppression vehicle is effectively prolonged.
In a preferred embodiment of the present invention, when the hydraulic oil is cooled, if the temperature of the hydraulic oil flowing out of the water cooler is within the safety set range, the value of the control signal YV2 output by the central controller is maintained unchanged, otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV2, so that the value of the control signal YV2 is correspondingly increased or decreased, and then the opening degree of the electric proportional water valve is increased or decreased, thereby ensuring that the temperature of the hydraulic oil flowing out of the water cooler is within the safety set range.
The embodiment can feed back the temperature of the hydraulic oil flowing out of the water cooler to the central controller for closed-loop control, and ensures that the temperature of the cooled hydraulic oil meets corresponding requirements.
In a preferred embodiment of the present invention, if the control signal YV1 is adjusted in a positive feedback or negative feedback manner, the central controller correspondingly increases or decreases the value of the control signal YV1, and then keeps the rotation speed of the motor and the water pump stable, specifically including the steps of:
the control panel is provided with a '1-ring spraying' switch and a '2-ring spraying' switch, so that three operation modes of 1-ring single-ring operation, 2-ring single-ring operation and double-ring simultaneous operation can be realized, if the operation mode is single-ring spraying, the first air cannon nozzle ring operation is selected, the central controller outputs an initial value of a control signal YV1 to the proportional control valve, the proportional control valve is opened, the oil pump discharge capacity is increased, and the motor drives the water pump to rotate. Meanwhile, the central controller outputs a switching value signal DT1 to the first pneumatic stop valve, and the first pneumatic stop valve is opened to start spraying operation. When DT1 is powered, the water pressure sensor detects water pressure P1 and transmits water pressure P1 back to the central controller, and the central controller determines water pressure P1 and controls water pressure P1 according to the determination result (see FIG. 4):
when the P1 is more than or equal to 1.4 and less than or equal to 1.6, the control signal YV1 is kept unchanged, and the rotating speed of the water pump is kept stable; when P1 is less than 1.4, the central controller performs positive feedback adjustment on the control signal YV1, the value of the control signal YV1 is increased, the rotating speed of the motor and the water pump is increased, the water yield of the water pump is increased, and accordingly P1 is increased; when P1 is greater than 1.6, the central controller performs negative feedback regulation on the control signal YV1, the value of the control signal YV1 is reduced, the rotating speed of the motor and the water pump is reduced, the water yield of the water pump is reduced, and accordingly P1 is reduced.
When the P1 is regulated, the feedback regulation quantity of the control signal YV1 is set to be delta YV1, wherein the regulation frequency of the delta YV1 is that the water pump output water pressure P1 is detected once per second, the value of the control signal YV1 is subjected to feedback regulation once according to the detection result, and the specific value of the delta YV1 is calculated according to the following formula:
in the embodiment, N is 1.5Mpa, and according to the calculation method, when the value of P1 is far less than or far greater than 1.5MPa, the adjustment value of delta YV1 is large, so that the rapid change of the rotating speed of the water pump can be realized, and the value of P1 is rapidly close to 1.5 MPa; when the P1 value is close to 1.5MPa, the regulating value of the delta YV1 is small, the rotating speed of the water pump can be changed smoothly, and the P1 value is finally stabilized to be about 1.5 MPa.
The central controller adjusts the YV1 signal based on the above judgment principle, so that the P1 is always maintained at about 1.5 +/-0.1 MPa, and the optimal spraying effect is achieved.
When the 2-ring spraying switch is turned on and the nozzle ring of the second air cannon works, the control process is the same as that of the nozzle ring of the first air cannon, and the detailed description is omitted.
In a preferred embodiment of the present invention, when the operation mode is changed from the single-ring spray to the double-ring spray, or from the double-ring spray to the single-ring spray, the control signal YV1 is increased or decreased by a set value, and then feedback adjustment is performed according to the single-ring spray operation mode, specifically:
when the operation mode is changed from the one-ring spray to the two-ring spray, the variation amount of the value of the control signal YV1 is large, and thus the variation amount of the value of the control signal YV1 is changed in two steps:
in the first step, the value of the control signal YV1 is rapidly increased by 100 mA;
second, the measured P1 values were adjusted according to the Δ YV1 adjustment method described above.
Similarly, when the operation mode is changed from the double-ring spray to the single-ring spray, the change of the value of the control signal YV1 is also performed in two steps:
firstly, the YV1 signal value is rapidly reduced by 100 mA;
second, the P1 value was measured and adjusted according to the Δ YV1 adjustment method described above
By the two-step adjusting method, when the spraying mode is changed, the spraying water pressure can quickly tend to be stable, and large fluctuation cannot be generated.
In a preferred embodiment of the present invention, if the control signal YV2 is subjected to positive feedback or negative feedback adjustment by the central controller, the value of the control signal YV2 is correspondingly increased or decreased, and then the opening of the electric proportional water valve is increased or decreased, so as to ensure that the temperature of the hydraulic oil flowing out of the water cooler is within the safety setting range, specifically, the method includes the following steps:
s31, if the temperature of the hydraulic oil flowing out of the water cooler is larger than the upper limit of the safety set range value, the central controller performs positive feedback adjustment on a control signal YV2, the value of the control signal YV2 is increased, the opening of the electric proportional water valve is increased, and the amount of water entering the water cooler is increased, so that the temperature of the hydraulic oil flowing out of the water cooler is reduced to be within the safety set range value, meanwhile, the central controller immediately performs positive feedback adjustment on the control signal YV1, the rotating speed of the water pump is increased, and the output water pressure is increased until the output water pressure of the water pump is stabilized within the safety set range value;
s32, if the temperature of the hydraulic oil flowing out of the water cooler is smaller than the lower limit of the safety set range value, the central controller performs negative feedback adjustment on the control signal YV2, the value of the control signal YV2 is reduced, the opening of the electric proportional water valve is reduced, and the water quantity entering the water cooler is reduced, so that the temperature of the hydraulic oil flowing out of the water cooler is increased to the safety set range value, meanwhile, the central controller immediately performs negative feedback adjustment on the control signal YV1, the rotating speed of the water pump is reduced, and the output water pressure is reduced until the output water pressure of the water pump is stabilized within the safety set range value.
In this embodiment, after the water pump is started, the first oil temperature sensor detects the temperature T1 of the oil inlet of the water cooler, and after the temperature T1 is transmitted back to the central controller, the central controller makes a determination: when the temperature T1 is higher than 50 ℃, the central controller outputs an analog quantity control signal YV2 to the electric proportional water valve, the electric proportional water valve is opened, and part of the water discharged by the water pump flows into the water cooler to cool the hydraulic oil. When the signal YV2 is electrified, the second oil temperature sensor starts to detect the temperature T2 of the oil outlet of the water cooler and transmits T2 back to the central controller, and the central controller makes a judgment on the T2 and controls T2 and P1 according to the judgment result (see figure 5):
when T2 is more than or equal to 38 and less than or equal to 42, the control signal YV2 is kept unchanged, the opening of the electric proportional water valve is unchanged, and the water quantity of the branch of the water cooler is kept stable. When T2 is greater than 42, the central controller performs positive feedback adjustment on the control signal YV2, the value of the control signal YV2 is increased, the opening of the electric proportional water valve is increased, and the amount of water entering the water cooler is increased, so that the temperature of hydraulic oil is reduced, and T2 is reduced; when the water quantity of the branch of the electric proportional water valve is increased, the P1 is correspondingly reduced, and at the moment, the central controller can adjust the control signal YV1 immediately, so that the rotating speed of the water pump is increased, and the water pressure is increased until the water pressure is stabilized at about 1.5 +/-0.1 MPa. When T2 is less than 38, the central controller performs negative feedback adjustment on the control signal YV2, the value of the control signal YV2 is reduced, the opening degree of the electric proportional water valve is reduced, the water quantity entering the water cooler is reduced, the temperature of hydraulic oil is increased, and T2 is increased; when the water quantity of the branch of the electric proportional water valve is reduced, the P1 is correspondingly increased, and at the moment, the central controller immediately adjusts the control signal YV1, so that the rotating speed of the water pump is reduced, and the water pressure is reduced until the water pressure is stabilized at about 1.5 +/-0.1 MPa.
In a preferred embodiment of the present invention, if the control signal YV2 is adjusted in a positive feedback or negative feedback manner, the central controller correspondingly increases or decreases the value of the control signal YV2, which specifically includes the following steps:
when the temperature of the hydraulic oil is regulated, the feedback regulation quantity of a control signal YV2 is set to be delta YV2, wherein the feedback regulation rate of delta YV2 is set to detect the temperature of the hydraulic oil flowing out of the water cooler once every 5 seconds, the feedback regulation is carried out on the control signal YV2 according to the detection result, and the specific value of delta YV2 is calculated according to the following formula:
wherein, M is the ideal value of the temperature of the hydraulic oil flowing out of the water cooler, and M is set to be 40 ℃ in the embodiment. The central controller adjusts the control signal YV2 based on the formula, so that the temperature T2 is always maintained at about 40 +/-2 ℃, the hydraulic system is ensured to reach the designed heat balance temperature value, and the control signal YV1 can automatically follow and adjust the P1 while adjusting the control signal, so that the rotating speed of the water pump is always matched with the working condition.
In a preferred embodiment of the present invention, further comprising the steps of:
and S4, when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds the threshold value of the set safety range, corresponding warning information is sent out.
The control method for the water way of the dust suppression vehicle further has an abnormal working condition alarming function, when part of abnormal working conditions related to safety performance continuously alarm, the system can automatically execute protection operation, and safety and robustness of system operation are greatly improved.
In a preferred embodiment of the present invention, when the measured temperature of the hydraulic oil, the rotation speed of the water pump, or the output water pressure of the water pump exceeds a threshold of a set safety range, the method sends out a corresponding warning message, and specifically includes the following steps:
s41, when the control signal YV1 is loaded to the maximum upper limit value set by the system and the detection values of the water pump output water pressure P1 for 5 times are all smaller than 1.4MPa, a fault lamp of 'abnormal working condition' is turned on the control panel at the moment, the 'low spray water pressure is prompted by voice, the machine is stopped for inspection', the accidental factors such as pressure impact can be eliminated by continuously identifying the P1 for 5 times, and false alarm is prevented;
s42, when the control signal YV1 is loaded to the minimum lower limit value set by the system and the detection values of the water pump output water pressure P1 for 5 times are all larger than 1.6MPa, a fault lamp of 'abnormal working condition' is turned on the control panel at the moment, and the voice prompt 'the spray water pressure is high, please stop the machine for inspection';
s43, when the detection values of the water pump rotating speed N1 for 5 times are all larger than 2500rpm, the central controller judges that the water pump is overspeed, a fault lamp of 'abnormal working condition' is lightened on a control panel, and the central controller reminds 'high rotating speed of the water pump, please stop the machine for inspection' by voice; if the overspeed working condition of the water pump is warned to exceed 30s and the driver does not perform effective control operation yet, the central controller stops outputting a control signal YV1 to stop the motor and the water pump from running, so that the water pump and the waterway system are protected;
s44, when the control signal YV2 is loaded to the maximum upper limit value set by the system and the detection values of the temperature T2 of the hydraulic oil flowing out of the water cooler are all larger than 42 ℃ for 5 times continuously, at the moment, a fault lamp with abnormal working conditions is turned on the control panel, and a voice prompt is given to the fact that the temperature of the hydraulic oil is high, a machine is required to be stopped for inspection, if a driver does not perform effective control operation, the temperature of the hydraulic oil flowing out of the water cooler is continuously increased to 50 ℃, a system gives a voice alarm that the temperature of the hydraulic oil is high, spraying operation is stopped, meanwhile, the central controller stops outputting control signals DT1 and DT2 to each pneumatic cut-off valve, stops spraying operation, only keeps the branch of the water cooler open, and quickly cools the hydraulic system;
s45, when the control signal YV2 is loaded to the minimum lower limit value set by the system, the detection values of the temperature T2 of the hydraulic oil flowing out of the water cooler for 5 times are all less than 38 ℃, at the moment, a fault lamp of ' abnormal working condition ' is turned on the control panel, and the ' low temperature of the hydraulic oil is prompted to be checked in a stopping way by voice.
The dust suppression vehicle waterway control method has multiple alarm functions of abnormal spraying water pressure, excessive speed of a water pump and abnormal hydraulic oil temperature, and when the abnormal working condition continuously alarms, the central controller can automatically execute corresponding protection operation, so that the abnormal loss of each part is limited in time, and the safety and the robustness of the system operation are greatly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dust suppression vehicle waterway control system, comprising:
the oil outlet of the oil tank is sequentially connected with the oil pump, the proportional control valve, the motor and a hydraulic oil inlet of the water cooler through pipelines, and a hydraulic oil outlet of the water cooler is connected with an oil return port of the oil tank through a pipeline;
the power input end of the water pump is in driving connection with the power output end of the motor;
the water outlet of the water tank is connected with the water inlet of the water pump through a pipeline, the water outlet of the water pump is respectively connected with the air cannon nozzle ring through a corresponding pneumatic cut-off valve, the water outlet of the water pump is also connected with the cooling water inlet of the water cooler through an electric proportional valve, and the cooling water outlet of the water cooler is connected with the water return port of the water tank through a pipeline;
the rotating speed sensor is arranged on the power output end of the motor and used for detecting the rotating speed of the water pump;
the water pressure sensor is arranged at a water outlet of the water pump and used for detecting the output water pressure of the water pump;
the oil temperature sensors are respectively arranged at a hydraulic oil inlet and a hydraulic oil outlet of the water cooler and are used for respectively detecting the temperature of hydraulic oil flowing into and out of the water cooler;
and the central controller is in signal connection with the proportional control valve, the rotating speed sensor, the water pressure sensor, the oil temperature sensor, the electric proportional valve and each pneumatic cut-off valve respectively, and is used for sending corresponding control signals to the proportional control valve and the electric proportional valve in real time according to the operation working condition of the nozzle ring of the air cannon, the measured hydraulic oil temperature, the measured water pressure and the water pump rotating speed, so that the temperature of the hydraulic oil and the water pump output water pressure are positioned in corresponding safety setting range values.
2. A dust suppression vehicle waterway control system of claim 1,
and the sound-light alarm system is in signal connection with the central controller and is used for sending corresponding warning information when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold value.
3. A dust suppression vehicle waterway control method based on the dust suppression vehicle waterway control system of claim 1 or 2, characterized by comprising the steps of:
after the spraying operation is started, the central controller respectively sends control signals YV1 and DT to the proportional control valve and the corresponding pneumatic stop valve, opens the proportional control valve and the corresponding pneumatic stop valve, and then obtains the output water pressure of the water pump and the temperature of hydraulic oil flowing into and out of the water cooler;
if the output water pressure is within the safe set range value, the central controller outputs the control signal YV1 with the constant value to keep the rotating speed of the motor and the water pump stable, otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV1 to correspondingly increase or decrease the value of the control signal YV1 and then keep the rotating speed of the motor and the water pump stable;
if the temperature of the hydraulic oil flowing into the water cooler reaches a set threshold value, the central controller outputs a control signal YV2 to the electric proportional water valve to open the electric proportional water valve, and then a part of the water discharged by the water pump flows into the water cooler to cool the hydraulic oil.
4. A dust suppression vehicle waterway control method according to claim 3,
when the hydraulic oil is cooled, if the temperature of the hydraulic oil flowing out of the water cooler is within a safety set range value, the value of the control signal YV2 output by the central controller is kept unchanged, otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV2 to correspondingly increase or decrease the value of the control signal YV2, and then the opening degree of the electric proportional water valve is increased or decreased to ensure that the temperature of the hydraulic oil flowing out of the water cooler is within the safety set range value.
5. A method for controlling a waterway of a dust suppression vehicle as recited in claim 3, wherein if the waterway is reversed, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV1 to make the value of the control signal YV1 correspondingly increase or decrease, so as to maintain the rotation speeds of the motor and the water pump stable, and the method specifically comprises the following steps:
when the operation mode is single-ring spraying, the feedback adjustment quantity of the control signal YV1 is set to be delta YV1, wherein the adjustment frequency of delta YV1 is that the water pump output water pressure is detected once per second, the value of the control signal YV1 is subjected to feedback adjustment once according to the detection result, and the specific value of delta YV1 is calculated according to the following formula:
wherein N is an ideal value of the water pressure output by the water pump.
6. A dust suppression vehicle waterway control method according to claim 5,
when the operation mode is changed from the single-ring spray to the double-ring spray or from the double-ring spray to the single-ring spray, the control signal YV1 is increased or decreased by a set value, and then feedback adjustment is performed according to the single-ring spray operation mode.
7. A dust suppression vehicle waterway control method as in claim 6, wherein otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV2 to correspondingly increase or decrease the value of the control signal YV2, and then increase or decrease the opening of the electric proportional water valve to ensure that the temperature of the hydraulic oil flowing out of the water cooler is within a safety set range, specifically comprising the steps of:
if the temperature of the hydraulic oil flowing out of the water cooler is larger than the upper limit of the safety set range value, the central controller performs positive feedback adjustment on a control signal YV2, the value of the control signal YV2 is increased, the opening of the electric proportional water valve is increased, the amount of water entering the water cooler is increased, so that the temperature of the hydraulic oil flowing out of the water cooler is reduced to be within the safety set range value, meanwhile, the central controller immediately performs positive feedback adjustment on the control signal YV1, the rotating speed of the water pump is increased, and the output water pressure is increased until the output water pressure of the water pump is stabilized to be within the safety set range value;
if the temperature of the hydraulic oil flowing out of the water cooler is smaller than the lower limit of the safety set range value, the central controller performs negative feedback adjustment on the control signal YV2, the value of the control signal YV2 is reduced, the opening of the electric proportional water valve is reduced, and the water quantity entering the water cooler is reduced, so that the temperature of the hydraulic oil flowing out of the water cooler is increased to the safety set range value, meanwhile, the central controller performs negative feedback adjustment on the control signal YV1 immediately, the rotating speed of the water pump is reduced, and the output water pressure is reduced until the output water pressure of the water pump is stabilized in the safety set range value.
8. A dust suppression vehicle waterway control method according to claim 7, wherein otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV2 to correspondingly increase or decrease the value of the control signal YV2, specifically comprising the steps of:
setting the feedback adjustment quantity of the control signal YV2 as delta YV2, wherein the feedback adjustment rate of delta YV2 is set to detect the temperature of the hydraulic oil flowing out of the water cooler once every 5 seconds, and performing feedback adjustment on the control signal YV2 according to the detection result, and the specific value of delta YV2 is calculated according to the following formula:
and M is an ideal temperature value of the hydraulic oil flowing out of the water cooler.
9. A method for controlling a waterway of a dust suppression vehicle as recited in claim 3, further comprising the steps of:
and when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold value, corresponding warning information is sent out.
10. The waterway control method for the dust suppression vehicle as recited in claim 9, wherein when the measured temperature of the hydraulic oil, the rotating speed of the water pump or the output water pressure of the water pump exceeds a threshold value of a set safety range, a corresponding warning message is sent out, and the method specifically comprises the following steps:
when the control signal YV1 is loaded to the maximum upper limit value set by the system and the detection values of the water pump output water pressure for a plurality of times are all smaller than the lower limit value of the safety setting range value, corresponding warning information is sent out;
when the control signal YV1 is loaded to the minimum lower limit value set by the system and the detection values of the water pressure output by the water pump for a plurality of times are all larger than the upper limit value of the safety setting range value, corresponding warning information is sent out;
when the detection values of the water pump rotating speed for a plurality of times are all larger than the upper limit, the central controller judges that the water pump is overspeed and sends out corresponding warning information, if the working condition that the water pump is overspeed is warned to exceed the set time and the driver still does not carry out effective control operation, the central controller stops outputting a control signal YV1 to stop the motor and the water pump from running;
when the control signal YV2 is loaded to the maximum upper limit value set by the system and the detected values of the temperature of the hydraulic oil flowing out of the water cooler for a plurality of times are all larger than the upper limit value of the safety set range, corresponding warning information is sent out, if a driver does not carry out effective control operation, the temperature of the hydraulic oil flowing out of the water cooler is continuously increased to the set value, corresponding warning information is sent out, meanwhile, the central controller stops outputting DT signals to each pneumatic cut-off valve, and spraying operation is stopped;
when the control signal YV2 is loaded to the minimum lower limit value set by the system, and the detected values of the temperature of the hydraulic oil flowing out of the water cooler for a plurality of times are all smaller than the lower limit value of the safety set range, corresponding warning information is sent out.
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