CN113019027B - 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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- CN113019027B CN113019027B CN202011489238.7A CN202011489238A CN113019027B CN 113019027 B CN113019027 B CN 113019027B CN 202011489238 A CN202011489238 A CN 202011489238A CN 113019027 B CN113019027 B CN 113019027B
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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 of driving a water pump by a hydraulic system, cooling of the hydraulic system, temperature detection of hydraulic oil, a specific hydraulic oil cooling control scheme and the like are mostly not considered, and the above arrangement may bring about the following defects and problems:
1. the working efficiency of the hydraulic system is low, and hydraulic elements are easy to age and damage.
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, aiming at solving 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-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 value kept unchanged 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, and then the rotating speed of the motor and the water pump is kept stable;
and 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 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, 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 in positive feedback or negative feedback adjustment, the central controller correspondingly increases or decreases the value of the control signal YV1, and then maintains the rotation speed of the motor and the water pump 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 the 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 numerical value of the 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 control signal YV2 is in a positive feedback or negative feedback adjustment state, the central controller correspondingly increases or decreases the value of the control signal YV2, and then increases or decreases the opening of the electric proportional water valve, so as to ensure that the temperature of the hydraulic oil flowing out of the water cooler is within a safety set range, specifically comprising the following steps:
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 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 be within 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 within the safety set range value.
Further, if the control signal YV2 is not in the positive feedback state, 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, specifically including the steps of:
setting the feedback adjustment quantity of the control signal YV2 as delta YV2, wherein the feedback adjustment rate of the 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 the 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 pressure output by the water pump for a plurality of times are all smaller than the lower limit value of the safety set 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 rotating speed of the water pump is continuously detected for a plurality of times and the detected value is larger than the upper limit, the central controller judges that the water pump is overspeed and sends out corresponding warning information, if the overspeed working condition of the water pump is warned to exceed the set time and the driver still does not carry out effective control operation, the central controller stops outputting the control signal YV1, so that the motor and the water pump stop 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, the 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;
and when the control signal YV2 is loaded to the minimum lower limit value set by the system and the detection 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 water channel control system of the embodiment performs closed-loop control on the rotating 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 rotating speed sensor, the oil temperature sensor and the like, so that the rotating speed of the water pump and the water quantity entering the water cooler are subjected to feedback regulation respectively based on the change of the pressure of a water outlet of the water pump and the temperature of cooled hydraulic oil, and therefore, the embodiment can utilize the spraying water channel 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 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 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 rotation speed sensor is installed for recording the rotation speed N1 (rpm) of the water pump.
The water pump is driven by the motor and outputs water flow to each air gun nozzle and the water cooler respectively. And a water pressure sensor is arranged at the outlet of the water pump and 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 starting spraying operation, the central controller sends control signals YV1 and DT to the proportional control valve and the corresponding pneumatic cut-off valve respectively, opens the proportional control valve and the corresponding pneumatic cut-off 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 value, the central controller outputs a control signal YV1 with a constant value, so that the rotating speeds of the motor and the water pump are kept stable, otherwise, the central controller performs corresponding positive feedback or negative feedback regulation on the control signal YV1, so that the value of the control signal YV1 is correspondingly increased or reduced, and further the rotating speeds of the motor and the water pump are kept 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 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.
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 in positive feedback or negative feedback adjustment, the central controller correspondingly increases or decreases the value of the control signal YV1, and then keeps the rotation speeds 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, a 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. After DT1 is powered, the water pressure sensor detects water pressure P1 and transmits the water pressure P1 back to the central controller, and the central controller determines the water pressure P1 and controls the water pressure P1 according to the determination result (see fig. 4):
when 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 therefore P1 is increased; when P1>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 therefore P1 is reduced.
When the pressure 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 numerical 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 P1 is far smaller than or far larger than 1.5MPa, the adjustment value of the delta YV1 is larger, so that the rapid change of the rotating speed of the water pump can be realized, and the value P1 is rapidly close to 1.5MPa; when the P1 value is close to 1.5MPa, the adjusting value of the delta YV1 is small, so that the rotating speed of the water pump can be changed stably, and the P1 value is finally stabilized at about 1.5 MPa.
The central controller adjusts the YV1 signal based on the 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 is operated, the control process of the second air cannon is the same as that of the nozzle ring of the first air cannon, and the 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 of the value of the control signal YV1 is large, and thus the variation of the value of the control signal YV1 is performed in two steps:
firstly, the value of the control signal YV1 is rapidly increased by 100mA;
in the second step, the detected P1 value is adjusted according to the delta YV1 adjustment method.
Similarly, when the operation mode is changed from the double-ring spray to the single-ring spray, the change in the value of the control signal YV1 is also performed in two steps:
firstly, the YV1 signal value is rapidly reduced by 100mA;
secondly, detecting the P1 value and adjusting according to the delta YV1 adjusting method
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 in a positive feedback or negative feedback adjustment state, the central controller correspondingly increases or decreases the value of the control signal YV2, and then increases or decreases the opening of the electric proportional water valve, so as to ensure that the temperature of the hydraulic oil flowing out of the water cooler is within a safety setting range, specifically including the steps of:
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 performs positive feedback adjustment on the control signal YV1 immediately, 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;
and 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 be within 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 within the safety set range value.
In this embodiment, after the water pump starts, first oil temperature sensor detects the temperature T1 of water cooler fluid entry, transmits T1 back to central controller, and central controller makes the judgement: when 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. After the YV2 signal is powered, 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 determination on T2 and controls T2 and P1 according to the determination result (see fig. 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 to increase the rotating speed of the water pump and increase the water pressure 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 of the electric proportional water valve is reduced, and the amount of water entering the water cooler is reduced, so that 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 can adjust the control signal YV1 immediately to reduce the rotating speed of the water pump and reduce the water pressure 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 in positive feedback or negative feedback adjustment, the central controller correspondingly increases or decreases the value of the control signal YV2, specifically including the steps of:
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 the delta YV2 is set to be that the temperature of the hydraulic oil flowing out of the water cooler is detected every 5 seconds, the feedback regulation is carried out on the control signal YV2 according to the detection result, and the specific numerical value of the 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 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 when adjusting the control signal, so that the rotating speed of the water pump is always matched with the operation 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 a set safety range threshold value, sending corresponding warning information.
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 continuous times are all smaller than 1.4MPa, a fault lamp of 'abnormal working condition' is lightened on the control panel at the moment, a voice prompt 'low spray water pressure, a stop check is requested', the P1 can be continuously identified for 5 times, so that accidental factors such as pressure impact and the like can be eliminated, 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 continuous times are all larger than 1.6MPa, a fault lamp of 'working condition abnormity' is lightened on the control panel at the moment, and a voice prompt 'the spray water pressure is high, please stop 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 a voice prompt 'the water pump rotating speed is high, please stop for inspection'; 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 the 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 of 'abnormal working condition' is turned on the control panel, and a voice prompt '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 '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 stop valve, spraying operation is stopped, only the branch of the water cooler is kept open, and the hydraulic system is cooled rapidly;
and 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 ℃, and at the moment, a fault lamp of 'abnormal working condition' is turned on the control panel, and a voice prompt 'the temperature of the hydraulic oil is low, so that a user is required to stop the machine for inspection'.
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;
the central controller is respectively connected 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 through signals, and is used for flowing in and flowing out according to the operation working condition of the nozzle ring of the air cannon, the hydraulic oil temperature, the water pressure and the water pump rotating speed of the water cooler are transmitted to the proportional control valve and the electric proportional valve according to a set period in real time to send corresponding control signals and control the proportional control valve and the electric proportional valve in a cooperative manner to enable the hydraulic oil temperature and the water pump output water pressure of the water cooler to be located in corresponding safe set range values, wherein in each period, the regulating quantity of the value of the control signals is respectively in direct proportion to the current temperature deviation value and the current pressure deviation value, the current temperature deviation value is the current flowing out, the difference value of the hydraulic oil temperature and the ideal hydraulic oil temperature of the water cooler is obtained, and the current pressure deviation value is the difference value of the current water pressure and the ideal water pressure.
2. A dust suppression vehicle waterway control system of claim 1,
the water cooler is characterized by also comprising 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 flowing out of the water cooler, 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 according to a set period;
if the output water pressure is within the safe set range value, the central controller outputs a control signal YV1 with a constant value to keep the rotating speeds 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 further keep the rotating speeds of the motor and the water pump stable, wherein in each period, the adjustment quantity of the value of the control signal YV1 is in direct proportion to the magnitude of the current pressure deviation value, and the current pressure deviation value is the difference value between the current water pressure and the ideal water pressure;
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, then a part of the water discharged by the water pump flows into the water cooler to cool the hydraulic oil, wherein in each period, the adjustment quantity of the control signal YV2 is in direct proportion to the magnitude of the current temperature deviation value, and the current temperature deviation value is the difference value between the temperature of the hydraulic oil currently flowing out of the water cooler and the temperature of ideal 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 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 otherwise, the central controller performs corresponding positive feedback or negative feedback adjustment on the control signal YV1 to increase or decrease the value of the control signal YV1 correspondingly, so as to maintain the rotation speeds of the motor and the water pump stable, specifically comprising 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 the 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 numerical value of the delta YV1 is calculated according to the following formula:
wherein, N is the ideal value of water pump output water pressure, and P1 is the water pressure that water pressure sensor detected.
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. The dust suppression vehicle waterway control method of claim 6, wherein 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 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 a safety setting 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, 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 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 be within 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 within the safety set range value.
8. A method for controlling a waterway of a dust suppression vehicle as recited in claim 7, wherein if the waterway is reversed, 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 the 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 the delta YV2 is calculated according to the following formula:
and M is an ideal value of the temperature of the hydraulic oil flowing out of the water cooler, and T2 is the temperature 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 flowing out of the water cooler, 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. A method for controlling a waterway of a dust suppression vehicle as recited in claim 9, wherein when the measured temperature of the hydraulic oil flowing out of the water cooler, the rotating speed of the water pump or the output water pressure of the water pump exceeds a set safety range threshold, 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 pressure output by the water pump for a plurality of times are all smaller than the lower limit value of the safety set 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 rotating speed of the water pump is continuously detected for a plurality of times and the detected value is larger than the upper limit, the central controller judges that the water pump is overspeed and sends out corresponding warning information, if the overspeed working condition of the water pump is warned to exceed the set time and the driver still does not carry out effective control operation, the central controller stops outputting the control signal YV1, so that the motor and the water pump stop 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, the 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;
and when the control signal YV2 is loaded to the minimum lower limit value set by the system and the detection 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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| CN207314245U (en) * | 2017-08-11 | 2018-05-04 | 潍柴动力股份有限公司 | Auxiliary heat dissipating system, hydraulic system and dedusting car |
| CN207634445U (en) * | 2017-11-21 | 2018-07-20 | 徐州徐工环境技术有限公司 | Valve control load-sensitive dust suppression fog gun fluid power system |
| CN108980125A (en) * | 2018-08-15 | 2018-12-11 | 河南鼎诚环保装备股份有限公司 | A kind of hydraulic control system of the homologous fluid pressure type dust suppression vehicle of power |
| CN112012985A (en) * | 2020-09-25 | 2020-12-01 | 上海中联重科桩工机械有限公司 | Engineering machinery water system and engineering machinery equipment |
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