CN111288045A - Control method for loading and unloading electromagnetic valve of pump station - Google Patents
Control method for loading and unloading electromagnetic valve of pump station Download PDFInfo
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- CN111288045A CN111288045A CN202010202762.5A CN202010202762A CN111288045A CN 111288045 A CN111288045 A CN 111288045A CN 202010202762 A CN202010202762 A CN 202010202762A CN 111288045 A CN111288045 A CN 111288045A
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- pump
- unloading
- electromagnetic valve
- loading
- pressure value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/002—Electrical failure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/04—Distributing means for power supply in mines
- E21F17/08—Distributing hydraulic power; Pipe networks for hydraulic liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
Abstract
The invention discloses a control method for loading and unloading electromagnetic valves of a pump station, which comprises the following steps: s1, judging whether the two pressure sensors are over-pressurized at most, if so, enabling an over-pressure fault mark, unloading the electromagnetic valve and returning to S1, otherwise, proceeding to S2; s2, judging whether an overvoltage fault reset signal is received, if so, clearing an overvoltage fault flag and carrying out S3, and if not, carrying out S3; s3, reading the overvoltage fault mark, judging whether the pump station has system overvoltage fault according to the overvoltage fault mark, if so, unloading the electromagnetic valve and returning to S1, and if not, going to S4; and S4, judging whether the valve control enabling signal is enabled, if not, unloading the solenoid valve and returning to S1, and if so, automatically controlling the solenoid valve and proceeding to S5. The invention is used for solving the problems of single control and low reliability of the pumping station loading and unloading electromagnetic valve in the prior art.
Description
Technical Field
The invention relates to the technical field of mining control, in particular to a control method for loading and unloading electromagnetic valves of a pump station.
Background
The underground pump station for the coal mine provides hydraulic pressure, provides supporting and moving power for a fully mechanized mining face through a hydraulic support and the like, and is indispensable power equipment for modern fully mechanized mining equipment (such as coal mining machines, scraper conveyors, reversed loaders and the like). The pump station outputs pump liquid (such as emulsion) to enter a main pipeline through an electromagnetic valve and provides pressurizing power for equipment on the fully mechanized mining face, when the electromagnetic valve is loaded, the pump liquid enters the main pipeline through the electromagnetic valve, and when the electromagnetic valve is unloaded, the pump liquid returns to a liquid tank and does not provide pressurizing power for the equipment on the fully mechanized mining face. Therefore, the solenoid valve is a key component for hydraulic control of the pump station.
At present, the pressure of a pump station system is monitored in the conventional loading and unloading electromagnetic valve, when the pressure of the pump station system reaches a preset value, the electromagnetic valve is unloaded, and when the pressure of the pump station system does not reach the preset value, the electromagnetic valve is loaded.
In fact, the control of the loading and unloading electromagnetic valve is limited by the working state of a pump station, a manual setting mode, the pressure of a pump system, the pressure of a pump head and the like, and the loading and unloading electromagnetic valve is single in control and low in reliability in the prior art.
Disclosure of Invention
The invention aims to provide a control method of a loading and unloading electromagnetic valve of a pump station, which is used for solving the problems of single control and low reliability of the loading and unloading electromagnetic valve of the pump station in the prior art.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a control method for loading and unloading electromagnetic valves of a pump station is characterized by comprising the following steps:
s1, judging whether the two pressure sensors for detecting the pressure on the main pipeline are over-pressurized, if so, enabling an over-pressure fault mark, unloading the electromagnetic valve and returning to S1, otherwise, going to S2;
s2, judging whether an overvoltage fault reset signal is received, if so, clearing the overvoltage fault flag and carrying out S3, and if not, carrying out S3;
s3, reading the overvoltage fault mark, judging whether the pump station has system overvoltage fault according to the overvoltage fault mark, if so, unloading the electromagnetic valve and returning to S1, and if not, going to S4;
s4, judging whether the received valve control enabling signal is enabled, if not, unloading the electromagnetic valve and returning to S1, if so, automatically controlling the electromagnetic valve and proceeding to S5;
s5, judging whether one pressure sensor fails in real time when the pressure sensor exists, if so, unloading the electromagnetic valve and returning to S1, and if not, unloading or loading the electromagnetic valve and returning to S1 according to the feedback pressure value and the preset range;
and when two pressure sensors exist, judging whether each pressure sensor has a fault in real time, unloading or loading the electromagnetic valve and returning to S1 according to the preset range and the pressure value fed back by the pressure sensor without the fault when at least one pressure sensor has no fault, and unloading the electromagnetic valve and returning to S1 when both the two pressure sensors have faults.
The control method for loading and unloading the electromagnetic valve of the pump station further comprises the step of sending a manual control enabling signal to the electromagnetic valve.
In the control method of the pump station loading and unloading solenoid valve, the overpressure failure flag is latched while the overpressure failure flag is enabled in S1.
According to the control method of the loading and unloading solenoid valve of the pump station, the overvoltage fault reset signal is an overvoltage fault manual reset signal and is used for clearing the overvoltage fault flag.
According to the control method for the loading and unloading electromagnetic valve of the pump station, the pump station is controlled by the main station of the pump station, and when the system has an overvoltage fault, the pump station receives the overvoltage fault manual reset signal sent by the main station of the pump station.
According to the control method for the loading and unloading solenoid valve of the pump station, the two pressure sensors comprise a pump head pressure sensor for detecting a pump head pressure value and a pump system pressure sensor for detecting a pump system pressure value, and when the pump head pressure value and/or the pump system pressure value is larger than a preset overpressure fault pressure value, the overpressure fault mark enables and unloads the solenoid valve, and the operation returns to S1.
According to the control method for loading and unloading the solenoid valve of the pump station, when the pressure value of the pump head is larger than the preset range Z1 when the pressure sensor of the pump system fails, the solenoid valve is unloaded and returns to S1, and when the pressure value of the pump head is smaller than the preset range Z1, the solenoid valve is loaded and returns to S1; when the pump head pressure sensor is in fault and the pressure value of the pump system is larger than a preset range Z2, unloading the electromagnetic valve and returning to S1, and when the pressure value of the pump system is smaller than a preset range Z2, loading the electromagnetic valve and returning to S1; unloading the solenoid valve and returning to S1 when both the pump system pressure sensor and the pump head pressure sensor fail; when the pump system pressure sensor and the pump head pressure sensor are both faultless, the electromagnetic valve is unloaded and returns to S1 when the pump head pressure value is greater than a preset range Z1 or the pump system pressure value is greater than a preset range Z2, and the electromagnetic valve is loaded and returns to S1 when the pump head pressure value is less than a preset range Z1 and the pump system pressure value is less than a preset range Z2.
According to the control method for the loading and unloading electromagnetic valve of the pump station, the pump station is controlled by the main station of the pump station, and the pump station receives the valve control enabling signal sent by the main station of the pump station.
Compared with the prior art, the invention has the advantages and positive effects that: the loading or unloading of the electromagnetic valve is realized by judging whether the system overvoltage fault and the valve control enable signal are enabled, and the loading and unloading of the electromagnetic valve are reliable; and can compatible a pressure sensor or two kinds of pressure sensor, when arbitrary trouble of two kinds of pressure sensor, the pump station still can continuous operation, improves pump station operational reliability.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of a control method for loading and unloading a solenoid valve of a pump station according to the present invention;
fig. 2 is a flow chart of loading and unloading control of the solenoid valve when the pump head pressure sensor fails and the pump system pressure sensor does not fail in the control method embodiment of the pump station loading and unloading solenoid valve provided by the invention.
Fig. 3 is a flow chart of the loading and unloading control of the solenoid valve when the pump system pressure sensor fails and the pump head pressure sensor does not fail in the control method embodiment of the pump station loading and unloading solenoid valve provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
In order to realize the reliable loading and unloading solenoid valves and ensure the working reliability of the pump station, the embodiment relates to a control method of the loading and unloading solenoid valves of the pump station, and the following description is specifically made with reference to fig. 1.
And S1, judging whether the two pressure sensors for detecting the pressure on the main pipeline are excessive pressure or not, if so, enabling an excessive pressure fault mark, unloading the electromagnetic valve and returning to S1, otherwise, executing S2.
The pump liquid of pump station output can get into the trunk line through the solenoid valve, can be provided with pump head pressure sensor in the position that is close to the solenoid valve for detect pump head internal pressure, use as the protection, avoid the pump head internal pressure too big and damage the pump station pressure-bearing pipeline, and pump head pressure sensor generally is close to the solenoid valve setting, therefore the pressure value that general pump head pressure sensor fed back is undulant great greatly.
Be provided with the pump system pressure sensor who is used for detecting the main pipe pressure on keeping away from the solenoid valve on the main pipe, the pressure value of pump system pressure sensor feedback is more steady for the pressure value of pump head pressure sensor feedback.
Of course, when only one pressure sensor is present, a pump system pressure sensor is typically provided.
When the overpressure fault judgment is performed on the pump head pressure sensor or the pump system pressure sensor, generally, the feedback pressure value is subjected to data filtering and then is respectively compared with a preset overpressure fault pressure value, if the comparison result of the two or any comparison result is greater than zero, the overpressure fault is indicated to be excessive, the overpressure fault flag is enabled, namely, the overpressure fault flag is set to be 1, and the electromagnetic valve is unloaded.
And a manual control point can be added, under the condition that the system overvoltage fault does not exist, when the manual control enable signal is enabled, the loading and unloading electromagnetic valves can be manually controlled, and once the system overvoltage fault exists, the manual control fails, the priority of the manual control is lower than that of the overvoltage fault, so that the safety of the manual control is ensured.
This manual control may be performed before S1, and when the manual control enable signal is enabled, the manual control loads the solenoid valve and returns to detecting whether the manual control enable signal is enabled, and when the manual control enable signal is not enabled, the process proceeds directly to S1.
Of course, it may also be performed after other steps, such as after S1, as long as it is ensured that the manual control cannot load the solenoid valve when there is a system overpressure failure.
The manual control is added, the electromagnetic valve can be controlled under the condition of manual operation, and the manual control is generally used for overhauling and overvoltage fault judgment under the condition that the electromagnetic valve is automatically controlled abnormally.
The overpressure at S1 is instantaneous and the pressure may drop quickly, so that when the pressure sensor is over-pressurized, the overpressure failure flag is latched, i.e., placed in the storage area, while the overpressure failure flag is enabled, to serve as the basis for the later system overpressure failure determination, which will be described below.
In addition, the purpose of latching is to maintain the state before power failure after the system is powered on again, namely, the overvoltage fault mark is not reset after the system is powered on again, and manual reset is required.
And S2, judging whether an overvoltage fault reset signal is received, if so, clearing the overvoltage fault flag and carrying out S3, and if not, carrying out S3.
Since the over-voltage fault flag is latched, manual clearing is required. Therefore, the overvoltage fault reset signal in S2 is selected as a manual overvoltage fault reset signal, which is used to manually reset the overvoltage fault flag, i.e., after reset, the overvoltage fault flag is cleared.
When an overvoltage fault exists, the pump station reports the overvoltage fault, for example, the main control is shut down through sound and light warning, after an operator sees the overvoltage fault, for example, the operator presses an overvoltage fault reset button to send a manual overvoltage fault reset signal to clear an overvoltage fault mark, and then the operator restarts the pump station or performs fault detection on the pump station, so that the stability and the safety of system control are enhanced.
And S3, reading the overvoltage fault mark, judging whether the pump station has system overvoltage faults according to the overvoltage fault mark, unloading the electromagnetic valve and returning to S1 if the system overvoltage faults exist, and going to S4 if the system overvoltage faults do not exist.
Since the pressure sensor overpressure is instantaneous, in this embodiment, the system overpressure fault is determined by the latched overpressure fault flag. If the read overvoltage fault flag is enabled (i.e., set to 1), it indicates that a system overvoltage fault exists, and if the read overvoltage fault flag is not enabled (i.e., set to 0), it indicates that an overvoltage fault does not exist.
The solenoid valve is unloaded and returned to S1 when there is a system overpressure fault, and to S4 when there is no system overpressure fault.
And S4, judging whether the received valve control enabling signal is enabled, if not, unloading the solenoid valve and returning to S1, if so, automatically controlling the solenoid valve, and proceeding to S5.
The pump station is controlled by the pump station main station, and data communication is carried out through a CAN bus, for example, the pump station main station sends a valve control enabling signal to the pump station after a main pump motor is started to operate for a period of time, and the electromagnetic valve starts to be automatically controlled to act when the valve control enabling signal is enabled, so that current impact of the main pump motor which needs to be operated in a loading mode at the moment of starting is avoided. In addition, other hardware such as an oil temperature sensor for detecting the temperature of lubricating oil, an oil level sensor for detecting the oil level of the lubricating oil, a temperature sensor for detecting the temperature of a main pump motor, a temperature sensor for detecting the temperature of a crankcase bearing and the like is arranged on the pump station, and when the sensors detect that corresponding parameters are different, a valve control enabling signal sent by a main station of the pump station is forced to be set from 1 to 0, so that the electromagnetic valve is prevented from being automatically loaded when other hardware fails.
S5: after receiving the enabling of the valve control enabling signal, the electromagnetic valve is automatically controlled, and then the system enters normal work and carries out fault processing on the pressure sensor arranged on the main pipeline in real time.
A pressure sensor may be provided on the main conduit, being a pump system pressure sensor or a pump head pressure sensor, typically selected as a pump system pressure sensor. Also can set up two pressure sensor on the trunk line, one is pump head pressure sensor, and one is pump system pressure sensor.
For one pressure sensor, a preset range Z is set, which has a preset upper limit value and a preset lower limit value.
For example, if a pump system pressure sensor is present on the main pipe, the solenoid valve is unloaded and returns to S1.
When the pump system pressure sensor is not in fault, comparing the pump system pressure value fed back by the pump system pressure sensor with a preset upper limit value, and unloading the electromagnetic valve and returning to S1 if the pump system pressure value is greater than the preset upper limit value; if the pump system pressure value is less than the preset lower limit, the solenoid valve is loaded and the process returns to S1.
In the present embodiment, the control of the solenoid valve is a control of the hysteresis window, which is described in detail below.
If the pump system pressure value is less than the interval of Z (pump system pressure value is less than the preset lower limit value promptly), then load the solenoid valve, promote pressure, until the pump system pressure value is greater than the interval of Z (pump system pressure value is greater than the preset upper limit value promptly), control the uninstallation solenoid valve again, working face liquid thereafter, lead to the pump system pressure value to descend, in the interval that the pump system pressure value is less than Z, begin the load solenoid valve again, promote pressure, until the pump system pressure value is greater than the interval of Z, the uninstallation solenoid valve of the secondary control, so repeatedly, make the pump system pressure value maintain in the interval of Z.
A preset range Z1 and a preset range Z2 are set for the pump head pressure sensor and the pump system pressure sensor, respectively. For example, if both pressure sensors fail, the solenoid valve is unloaded and returns to S1 when there is a pump system pressure sensor and a pump head pressure sensor on the main conduit.
As described in fig. 2, a flow chart illustrating the control of the loading and unloading of the solenoid valve when the pump system pressure sensor is not malfunctioning and the pump head pressure sensor is malfunctioning is shown.
When the pump head pressure sensor fails and the pump system pressure sensor does not fail, comparing the pump system pressure value fed back by the pump system pressure sensor with a preset range Z2, and if the pump system pressure value is larger than the preset range Z2, unloading the electromagnetic valve and returning to S1; if the pump system pressure value is less than the preset range Z2, the solenoid valve is loaded and the process returns to S1. If the pressure value of the pump system is lower than the preset range Z2, loading the electromagnetic valve, lifting the pressure until the pressure value of the pump system is larger than the preset range Z2, controlling the unloading electromagnetic valve, using the working face liquid to cause the pressure value of the pump system to drop, wherein the pressure value of the pump system is lower than the preset range Z2, starting to load the electromagnetic valve again, lifting the pressure until the pressure value of the pump system is larger than the preset range Z2, controlling the unloading electromagnetic valve, repeating the steps, and maintaining the pressure value of the pump system in the preset range Z2.
As described in fig. 3, a flow chart illustrating the loading and unloading control of the solenoid valve when the pump system pressure sensor fails and the pump head pressure sensor does not fail is shown.
When the pump system pressure sensor fails and the pump head pressure sensor does not fail, comparing the pump head pressure value fed back by the pump head pressure sensor with a preset range Z1, and if the pump head pressure value is larger than the preset range Z1, unloading the electromagnetic valve and returning to S1; if the pump head pressure value is less than the preset range Z1, the solenoid valve is loaded and the process returns to S1.
If the pump head pressure value is lower than the preset range Z1, the electromagnetic valve is loaded, the pressure is increased until the pump head pressure value is larger than the preset range Z1, the unloading electromagnetic valve is controlled again, the working face liquid consumption is caused, the pump head pressure value is reduced, the pressure value of the pump head is lower than the preset range Z1, the electromagnetic valve is loaded again, the pressure is increased until the pump head pressure value is larger than the preset range Z1, the unloading electromagnetic valve is controlled again, and the operation is repeated so that the pump head pressure value is maintained in the preset range Z1.
When the pump head pressure sensor and the pump system pressure sensor are not in fault, comparing the pump system pressure value fed back by the pump system pressure sensor with a preset range Z2, comparing the pump head pressure value fed back by the pump head pressure sensor with a preset range Z1, and unloading the electromagnetic valve and returning to S1 if the pump system pressure value is larger than the preset range Z2 or the pump head pressure value is larger than the preset range Z1; if the pump system pressure value is less than the preset range Z2 and the pump head pressure value is less than the preset range Z1, the solenoid valve is loaded and the process returns to S1.
If the pump head pressure value is lower than the preset range Z1, and the pump system pressure value is lower than the preset range Z2, the electromagnetic valve is loaded, the pressure is lifted until the pump head pressure value is larger than the preset range Z1 or the pump system pressure value is larger than the preset range Z2, the electromagnetic valve is unloaded by controlling, then the working surface uses liquid, the pump head pressure value is reduced, the pump head pressure value is lower than the preset range Z1 and the pump system pressure value is lower than the preset range Z2, the electromagnetic valve is loaded again, the pressure is lifted until the pump head pressure value is larger than the preset range Z1 or the pump system pressure value is larger than the preset range Z2, the electromagnetic valve is unloaded by controlling, and the steps are repeated, so that the pump head pressure value is maintained in the preset range Z1 and the.
Can compatible a pressure sensor or two kinds of pressure sensor, when arbitrary trouble of two kinds of pressure sensor, the pump station still can continuous operation, improves pump station operational reliability.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. A control method for loading and unloading electromagnetic valves of a pump station is characterized by comprising the following steps:
s1, judging whether the two pressure sensors for detecting the pressure on the main pipeline are over-pressurized, if so, enabling an over-pressure fault mark, unloading the electromagnetic valve and returning to S1, otherwise, going to S2;
s2, judging whether an overvoltage fault reset signal is received, if so, clearing the overvoltage fault flag and carrying out S3, and if not, carrying out S3;
s3, reading the overvoltage fault mark, judging whether the pump station has system overvoltage fault according to the overvoltage fault mark, if so, unloading the electromagnetic valve and returning to S1, and if not, going to S4;
s4, judging whether the received valve control enabling signal is enabled, if not, unloading the electromagnetic valve and returning to S1, if so, automatically controlling the electromagnetic valve and proceeding to S5;
s5, judging whether one pressure sensor fails in real time when the pressure sensor exists, if so, unloading the electromagnetic valve and returning to S1, and if not, unloading or loading the electromagnetic valve and returning to S1 according to the feedback pressure value and the preset range;
and when two pressure sensors exist, judging whether each pressure sensor has a fault in real time, unloading or loading the electromagnetic valve and returning to S1 according to the preset range and the pressure value fed back by the pressure sensor without the fault when at least one pressure sensor has no fault, and unloading the electromagnetic valve and returning to S1 when both the two pressure sensors have faults.
2. The control method of the pump station loading and unloading solenoid valve according to claim 1, further comprising the step of sending a manual control enable signal to the solenoid valve.
3. The control method for a pump station loading and unloading solenoid valve according to claim 1, wherein the overpressure failure flag is latched while the overpressure failure flag is enabled in S1.
4. The control method for the loading and unloading solenoid valve of the pump station according to claim 1 or 3, wherein the overvoltage fault reset signal is an overvoltage fault manual reset signal used for clearing the overvoltage fault flag.
5. The control method for the loading and unloading electromagnetic valve of the pump station according to claim 4, wherein the pump station is controlled by a master station of the pump station, and when the system has an overpressure fault, the pump station receives the overpressure fault manual reset signal sent by the master station of the pump station.
6. The control method for the pump station loading and unloading solenoid valve according to claim 1, wherein the two pressure sensors include a pump head pressure sensor for detecting a pump head pressure value and a pump system pressure sensor for detecting a pump system pressure value, and when the pump head pressure value and/or the pump system pressure value is greater than a preset overpressure failure pressure value, the overpressure failure flag enables, unloads the solenoid valve, and returns to S1.
7. The control method for the pumping station loading and unloading solenoid valve according to claim 6, wherein,
when the pump system pressure sensor is in fault and the pump head pressure value is larger than a preset range Z1, unloading the electromagnetic valve and returning to S1, and when the pump head pressure value is smaller than a preset range Z1, loading the electromagnetic valve and returning to S1;
when the pump head pressure sensor is in fault and the pressure value of the pump system is larger than a preset range Z2, unloading the electromagnetic valve and returning to S1, and when the pressure value of the pump system is smaller than a preset range Z2, loading the electromagnetic valve and returning to S1;
unloading the solenoid valve and returning to S1 when both the pump system pressure sensor and the pump head pressure sensor fail;
when the pump system pressure sensor and the pump head pressure sensor are both faultless, the electromagnetic valve is unloaded and returns to S1 when the pump head pressure value is greater than a preset range Z1 or the pump system pressure value is greater than a preset range Z2, and the electromagnetic valve is loaded and returns to S1 when the pump head pressure value is less than a preset range Z1 and the pump system pressure value is less than a preset range Z2.
8. The control method for loading and unloading the electromagnetic valve of the pump station according to claim 1, wherein the pump station is controlled by a master station of the pump station, and the pump station receives the valve control enabling signal sent by the master station of the pump station.
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