Wind sand test box for explosion-proof test and operation method thereof

Abstract

The invention provides a wind-sand test box for explosion-proof test and an operation method thereof, and belongs to the technical field of wind-sand test boxes, the wind-sand test box comprises a wind-sand test box, a sand conveying pipe, a variable frequency water pump, a water storage barrel, a support, a sand storage barrel, a spiral auger conveyor, a fan, a heating box, a panel, a PLC controller, a temperature controller and a frequency converter; a wind sand pipe is fixedly arranged on one side of the inner wall of the wind sand test box, an atomizing nozzle group is arranged above the wind sand test box, the atomizing nozzle group is communicated with a water outlet of a variable-frequency water pump through a water conveying pipe, a water inlet of the variable-frequency water pump is communicated with a water storage barrel through a water conveying pipe, and operation of all the components is controlled through a PLC. The device can simulate various combined environments of different temperatures, wind speeds, sand dust, salt mist and the like, and can be used for simulating a large amount of wind sand caused by transportation tools with propellers such as helicopters and hoverships during operation and water mist (salt water mist) caused by the transportation tools on the water side and the seaside so as to meet the requirements of different anti-explosion tests. Powerful guarantee is provided for quality control of anti-explosion products, and the anti-explosion device is suitable for popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of wind and sand test chambers, in particular to a wind and sand test chamber for explosion-proof testing and an operating method thereof. Background Art

[0002] Traditional wind and sand test chambers often have a single function and can only simulate wind and sand environments, but cannot simulate water mist environments, especially salt water mist environments, which greatly limits their application scope in explosion-proof testing.

[0003] At the same time, traditional wind and sand test chambers often have problems with complex operation and low precision in controlling wind and sand flow, temperature, and water mist generation, which not only affects the accuracy of the test, but also reduces the efficiency of the test. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a wind and sand test chamber for explosion-proof testing and an operating method thereof. Through the original wind and sand test chamber structural design, the functions of wind and sand simulation and water mist simulation are integrated, and the precise control of wind and sand flow, temperature and water mist generation is achieved through the PLC controller, which greatly improves the efficiency and accuracy of the test.

[0005] A wind and sand test chamber for explosion-proof testing and an operating method thereof, wherein:

[0006] In a first aspect, a wind and sand test chamber for explosion-proof testing comprises:

[0007] Wind and sand test chamber, sand conveying pipe, variable frequency water pump and water storage tank;

[0008] A bracket is provided on one side of the wind sand test box, a sand storage bucket is fixedly provided on the top of the bracket, a spiral auger conveyor is installed at the discharge port at the bottom end of the sand storage bucket, a fan is fixedly installed at the bottom end of the bracket, the air outlet of the fan faces upward and is fixedly connected to a heating box, the top of the heating box is fixedly connected to one end of the air duct, the spiral auger conveyor is connected to the top of the air duct through a sand conveying pipe, a panel is provided on the bottom side of the front of the bracket, a PLC controller is fixedly installed on the front of the panel, and a temperature controller and a frequency converter are fixedly installed on the back of the panel;

[0009] The PLC controller is used to control the variable frequency water pump, the temperature controller, the frequency converter and the stepper motor, wherein the frequency converter is electrically connected to the fan.

[0010] A sand blowing pipe is fixedly provided on one side of the inner wall of the sand blowing test box, the sand blowing pipe is connected to the other end of the air duct, the other side of the sand blowing test box is connected to an exhaust pipe, an atomizing nozzle group is provided above the sand blowing pipe, the atomizing nozzle group is fixedly connected to the water outlet of the variable frequency water pump through a water pipe, and the water inlet of the variable frequency water pump is connected to the water storage tank through the water pipe;

[0011] As an example, a front observation window is provided on one side of the front of the wind and sand test box, a flip door is provided on the other side of the front of the wind and sand test box, and two rear observation windows are provided on the back of the wind and sand test box. The status of the tested equipment in the wind and sand test box can be observed through the front observation window and the two rear observation windows, and the wind and sand test box can be opened and closed through the flip door, so that staff can enter and exit the wind and sand test box.

[0012] As an example, a base is provided at the bottom of one side of the interior of the wind sand test box close to the exhaust pipe, a fixing frame is provided on the base, and a baffle is provided on the fixing frame; the baffle blocks the wind sand pipe from spraying directly toward the exhaust pipe, thereby preventing dust or sand from being directly discharged from the exhaust pipe, reducing raw material consumption, and protecting the environment.

[0013] The front of the baffle faces the sand blowing pipe, and the back of the baffle corresponds to the air inlet of the exhaust pipe.

[0014] As an example, the spiral auger conveyor includes: a machine body, a stepper motor is fixedly installed at one end of the machine body, the output end of the stepper motor is transmission-connected to the spiral auger located inside the machine body, the top of the machine body is provided with a sand inlet connected to the discharge port of the sand storage bucket, the bottom of the machine body is provided with a sand outlet, the sand outlet is connected to one end of the sand conveying pipe, the PLC controller is connected with the electrical signal of the stepper motor, the stepper motor drives the spiral auger to rotate, and the rotation of the spiral auger causes the dust, sand and gravel in the sand storage bucket to be quantitatively and uniformly transported into the air duct, and blown out into the wind sand test box through the air duct.

[0015] As an example, a heating wire is installed inside the heating box, and a thermostat is electrically connected to the heating wire. The heating wire is controlled by the thermostat to simulate different temperatures in the actual environment.

[0016] As an example, a filter is fixedly installed at one end of the exhaust pipe extending into the wind and sand test box, and filtering is performed through the filter to effectively prevent dust or sand and gravel from leaking from the exhaust pipe, thereby protecting the environment and reducing raw material consumption.

[0017] As an example, the filter is a dust bag, which can recycle and reuse raw materials while filtering.

[0018] As an example, the atomizing nozzle group includes: a plurality of atomizing nozzles with a switch structure. By adjusting the switches, different combinations of atomizing nozzles can spray water mist to simulate actual needs.

[0019] In a second aspect, a method for operating a wind and sand test chamber for explosion-proof testing includes:

[0020] Step 1: Operate the PLC controller to control the frequency converter to make the fan reach the required speed;

[0021] Step 2: Synchronously, operate the PLC controller to control the thermostat, so that the heating wire heats up and simulates the required temperature;

[0022] Step 3: Synchronously, operate the PLC controller to control the speed of the stepper motor, drive the spiral auger to rotate, so that the dust and sand in the sand storage bucket are quantitatively and uniformly transported into the air duct, and blown into the wind sand test box through the air duct;

[0023] Step 4: When a salt spray environment is required, the PLC controller is synchronously operated to control the variable frequency water pump to spray seawater into the test chamber through the atomizing nozzle group.

[0024] The above devices can simulate environments with different temperatures, wind speeds, sand, dust and salt spray.

[0025] In a third aspect, the present application shows a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by a PLC controller, the PLC controller is enabled to execute the method described in any one of the above aspects.

[0026] In a fourth aspect, the present application provides a computer program product. When instructions in the computer program product are executed by a PLC controller, the PLC controller is enabled to execute the method as described in any one of the above aspects.

[0027] Beneficial effects of the present invention:

[0028] The operation of each component is controlled by the PLC controller to simulate various environments with different temperatures, wind speeds, sand, dust and salt spray, etc. It also simulates the large amount of wind and sand caused by helicopters, hovercraft and other propeller-carrying vehicles during operation, as well as the impact of water mist (including salt water mist) caused by vehicles near the water (sea) on themselves and other surrounding mechanical equipment parts. This meets the needs of different explosion-proof tests, greatly improves the efficiency and accuracy of explosion-proof tests, provides a strong guarantee for the quality control of explosion-proof products, and is suitable for testing various explosion-proof products.

[0029] It is easy to operate, assemble and maintain, environmentally friendly and pollution-free, and suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a rear view of the overall structure of a wind and sand test box for explosion-proof testing according to the present invention.

[0031] Figure 2 This is a front view of the overall structure of a wind and sand test box for explosion-proof testing according to the present invention.

[0032] Figure 3 The figure is a partial structural diagram of a wind and sand test box for explosion-proof testing according to the present invention.

[0033] Figure 4 The figure is a schematic structural diagram of a heating box of a wind and sand test box used for explosion-proof testing according to the present invention.

[0034] Figure 5 The figure is a schematic structural diagram of a spiral auger conveyor of a sand blowing test chamber for explosion-proof testing according to the present invention.

[0035] Figure 6 The figure is a schematic diagram of the PLC controller circuit connection of a sandstorm test box for explosion-proof testing according to the present invention.

[0036] In the figure: 1. Wind sand test chamber; 2. Bracket; 3. Sand storage bucket; 4. Auger conveyor; 5. Air duct; 6. Heating box; 7. Fan; 8. Thermostat; 9. Frequency converter; 10. Exhaust duct; 11. Rear observation window; 12. Front observation window; 13. Flip door; 14. PLC controller; 15. Wind sand pipe; 16. Filter; 17. Base; 18. Fixing bracket; 19. Baffle; 20. Heating wire; 21. Machine body; 22. Stepper motor; 23. Auger; 24. Sand inlet; 25. Sand outlet; 26. Panel; 27. Sand delivery pipe; 28. Atomizing nozzle group; 29. ​​Water pipe 1; 30. Frequency conversion water pump; 31. Water pipe 2; 32. Water storage bucket. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work shall fall within the scope of protection of the present application. Figures 1 to 6 As shown:

[0038] A wind and sand test chamber for explosion-proof testing and an operating method thereof, wherein:

[0039] In a first aspect, a wind and sand test chamber for explosion-proof testing comprises:

[0040] A wind and sand test box 1, a sand conveying pipe 27, a variable frequency water pump 30 and a water storage bucket 32; a bracket 2 is provided on one side of the wind and sand test box 1, a sand storage bucket 3 is fixedly provided on the top of the bracket 2, a spiral auger conveyor 4 is installed at the discharge port at the bottom end of the sand storage bucket 3, a fan 7 is fixedly installed at the bottom end of the bracket 2, the air outlet of the fan 7 faces upward and is fixedly connected to a heating box 6, the top of the heating box 6 is fixedly connected to one end of the air duct 5, the spiral auger conveyor 4 is connected to the top of the air duct 5 through the sand conveying pipe 27, a panel 26 is provided on the bottom side of the front of the bracket 2, a PLC controller 14 is fixedly installed on the front of the panel 26, and a temperature controller 8 and a frequency converter 9 are fixedly installed on the back of the panel 26;

[0041] The PLC controller is used to control the variable frequency water pump 30 , the temperature controller 8 , the frequency converter 9 and the stepper motor 22 , wherein the frequency converter 9 is electrically connected to the fan 7 .

[0042] A sand blowing pipe 15 is fixedly provided on one side of the inner wall of the sand blowing test box 1. The sand blowing pipe 15 is connected to the other end of the air duct 5. The other side of the sand blowing test box 1 is connected to the exhaust pipe 10. An atomizing nozzle group 28 is provided above the sand blowing pipe 15. The atomizing nozzle group 28 is fixedly connected to the water outlet of the variable frequency water pump 30 through a water pipe (i.e., a first water pipe 29). The water inlet of the variable frequency water pump 30 is connected to the water storage tank 32 through a water pipe (i.e., a second water pipe 31);

[0043] As an example, a front observation window 12 is provided on one side of the front of the wind and sand test box 1, a flip door 13 is provided on the other side of the front of the wind and sand test box 1, and two rear observation windows 11 are provided on the back of the wind and sand test box 1. The status of the tested equipment in the wind and sand test box 1 can be observed through the front observation window 12 and the two rear observation windows 11, and the wind and sand test box 1 can be opened and closed through the flip door 13, so that the staff can enter and exit the wind and sand test box 1.

[0044] As an example, a base 17 is provided at the bottom of one side of the interior of the wind sand test box 1 close to the exhaust pipe 10, a fixing frame 18 is provided on the base 17, and a baffle 19 is provided on the fixing frame 18; the baffle 19 blocks the wind sand pipe 15 from directly spraying toward the exhaust pipe 10, thereby preventing dust or sand from being directly discharged from the exhaust pipe 10, reducing raw material consumption, and protecting the environment.

[0045] The front side of the baffle 19 faces the sand blowing pipe 15 , and the back side of the baffle 19 corresponds to the air inlet of the exhaust pipe 10 .

[0046] As an example, the spiral auger conveyor 4 includes: a body 21, a stepper motor 22 is fixedly installed at one end of the body 21, and the output end of the stepper motor 22 is transmission-connected to a spiral auger 23 located inside the body 21, and the top of the body 21 is provided with a sand inlet 24 connected to the discharge port of the sand storage bucket 3, and the bottom of the body 21 is provided with a sand outlet 25, and the sand outlet 25 is connected to one end of the sand conveying pipe 27. The PLC controller 14 is electrically connected to the stepper motor 22, and the stepper motor 22 drives the spiral auger 23 to rotate. The rotation of the spiral auger 23 causes the dust, sand and gravel in the sand storage bucket 3 to be quantitatively and uniformly transported to the air duct 5, and blown out into the wind sand test box 1 through the air duct 5.

[0047] As an example, a heating wire 20 is installed inside the heating box 6, and the thermostat 8 is electrically connected to the heating wire 20. The heating wire 20 is controlled by the thermostat 8 to simulate different temperatures in the actual environment.

[0048] As an example, a filter screen 16 is fixedly provided at one end of the exhaust pipe 10 extending into the wind sand test box 1. Filtering is performed through the filter screen 16, effectively preventing dust or sand from leaking from the exhaust pipe 10, thereby protecting the environment and reducing raw material consumption.

[0049] As an example, the filter is a dust bag, which can recycle and reuse raw materials while filtering.

[0050] As an example, the atomizing nozzle group 28 includes: a plurality of atomizing nozzles with a switch structure. By adjusting the switches, different combinations of atomizing nozzles can spray water mist to simulate actual needs.

[0051] In a second aspect, a method for operating a wind and sand test chamber for explosion-proof testing includes:

[0052] Step 1: Operate the PLC controller to control the frequency converter to make the fan reach the required speed;

[0053] Step 2: Synchronously, operate the PLC controller to control the thermostat, so that the heating wire heats up and simulates the required temperature;

[0054] Step 3: Synchronously, operate the PLC controller to control the speed of the stepper motor, drive the spiral auger to rotate, so that the dust and sand in the sand storage bucket are quantitatively and uniformly transported into the air duct, and blown into the wind sand test box through the air duct;

[0055] Step 4: When a salt spray environment is required, the PLC controller is synchronously operated to control the variable frequency water pump to spray seawater into the test chamber through the atomizing nozzle group 28.

[0056] The above devices can simulate environments with different temperatures, wind speeds, sand, dust and salt spray.

[0057] As an example, when in use, the variable frequency water pump 30 draws out the fresh water or sea water stored in the water storage tank 32 through the water pipe 2 31, and sends it to the atomizing nozzle group 28 through the water pipe 1 29, thereby spraying water mist or salt water mist into the wind and sand test box 1, simulating the impact of water mist (salt water mist) caused by being at the water's edge (seaside) on itself and other surrounding mechanical equipment parts.

[0058] As an example, after starting the work, the fan 7 blows air, the air flow enters the heating box 6 and is heated in the heating box 6, and the heated air flow enters the wind sand test box 1 through the air duct 5. The sand storage bucket 3 stores dust or sand and gravel, and the spiral auger conveyor 4 transports the dust or sand and gravel to the air duct 5 in a quantitative and uniform manner. The dust or sand and gravel are blown into the wind sand test box 1 through the air duct 5, simulating a large amount of wind and sand caused by vehicles with propellers such as helicopters and hovercraft during operation.

[0059] In a third aspect, the present application shows a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by a PLC controller, the PLC controller is enabled to execute the method described in any one of the above aspects.

[0060] In a fourth aspect, the present application provides a computer program product. When instructions in the computer program product are executed by a PLC controller, the PLC controller is enabled to execute the method as described in any one of the above aspects.

[0061] In order to better illustrate the design principle of the present invention, the following examples are given through specific embodiments:

[0062] Example 1:

[0063] The test parameters, such as temperature, wind speed, sand and dust amount, and salt spray concentration, are set through the PLC controller 14. After starting the equipment, the PLC controller 14 first controls the inverter 9 to adjust the speed of the fan 7, thereby changing the air flow speed in the air duct 5 to simulate environmental conditions with different wind speeds. At the same time, the thermostat 8 controls the heating wire 20 in the heating box 6 to heat according to the preset temperature value, so that the air flow entering the wind sand test box 1 reaches the required temperature;

[0064] In terms of wind sand transportation, the PLC controller 14 controls the stepper motor 22 to rotate at a set speed. The stepper motor 22 drives the spiral auger 23 to rotate in the body 21, sucking the dust or sand in the sand storage bucket 3 through the sand inlet 24 at a constant speed and a certain quantity. Then, the dust or sand is sent into the air duct 5 through the sand outlet 25 and the sand conveying pipe 27, and finally sprayed into the wind sand test box 1 through the wind sand pipe 15 to simulate the wind sand environment.

[0065] Under the control of the PLC controller 14, the variable frequency water pump 30 draws fresh water or sea water from the water storage tank 32 and delivers it to the atomizing nozzle group 28 through the water delivery pipe 2 31 and the water delivery pipe 1 29. The atomizing nozzle group 28 is composed of multiple atomizing nozzles, which uniformly spray water mist or salt water mist into the wind sand test chamber 1, contacting the equipment under test, simulating the impact of water mist (salt water mist) on the equipment;

[0066] During the test, the staff can observe the status of the tested equipment in the wind and sand test chamber 1 and the progress of the test in real time through the front observation window 12 and the two rear observation windows 11. When it is necessary to enter the wind and sand test chamber 1 for equipment debugging or maintenance, the wind and sand test chamber 1 can be conveniently opened and closed through the flip door 13;

[0067] In addition, in order to prevent dust or sand from leaking from the exhaust pipe 10, a filter 16 is fixedly installed at one end of the exhaust pipe 10 extending into the wind sand test box 1. The filter 16 can effectively prevent dust or sand from entering the exhaust pipe 10, reducing environmental pollution.

[0068] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

[0069] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the embodiments of this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0070] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0071] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0072] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0073] The above are only preferred embodiments of the present invention. It should be understood that the description of the above embodiments is only used to help understand the method and core ideas of the present invention, and is not used to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, etc. made within the ideas and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wind and sand test chamber for explosion-proof testing, characterized in that: include: A wind and sand test box, a sand conveying pipe, a variable frequency water pump and a water storage bucket; a bracket is provided on one side of the wind and sand test box, a sand storage bucket is fixedly provided on the top of the bracket, a spiral auger conveyor is installed at the discharge port at the bottom end of the sand storage bucket, a fan is fixedly installed at the bottom end of the bracket, the air outlet of the fan faces upward and is fixedly connected to a heating box, the top of the heating box is fixedly connected to one end of the air duct, the spiral auger conveyor is connected to the top of the air duct through the sand conveying pipe, a panel is provided on the bottom side of the front of the bracket, a PLC controller is fixedly installed on the front of the panel, and a temperature controller and a frequency converter are fixedly installed on the back of the panel; the PLC controller is used to control the variable frequency water pump, the temperature controller, the frequency converter and the stepper motor, and the frequency converter is electrically connected to the fan; A wind sand pipe is fixedly provided on one side of the inner wall of the wind sand test box, and the wind sand pipe is connected to the other end of the air duct. The other side of the wind sand test box is connected to an exhaust pipe. An atomizing nozzle group is provided above the wind sand pipe. The atomizing nozzle group is fixedly connected to the water outlet of the variable frequency water pump through a water pipe, and the water inlet of the variable frequency water pump is connected to the water storage tank through the water pipe.

2. A wind and sand test chamber for explosion-proof testing according to claim 1, characterized in that: A front observation window is provided on one side of the front of the wind and sand test box, a flip door is provided on the other side of the front of the wind and sand test box, and two rear observation windows are provided on the back of the wind and sand test box.

3. The sandstorm test chamber for explosion-proof testing according to claim 1, characterized in that: A base is provided at the bottom of one side of the interior of the wind sand test box close to the exhaust pipe, a fixing frame is provided on the base, and a baffle is provided on the fixing frame; the baffle blocks the wind sand pipe from directly spraying toward the exhaust pipe; the front of the baffle faces the wind sand pipe, and the back of the baffle corresponds to the air inlet of the exhaust pipe.

4. The sandstorm test chamber for explosion-proof testing according to claim 1, characterized in that: The spiral auger conveyor includes: a body, a stepper motor is fixedly installed at one end of the body, the output end of the stepper motor is transmission-connected to the spiral auger located inside the body, the top of the body is provided with a sand inlet connected to the discharge port of the sand storage bucket, the bottom of the body is provided with a sand outlet, the sand outlet is connected to one end of the sand conveying pipe, a PLC controller is connected with the electrical signal of the stepper motor, the stepper motor drives the spiral auger to rotate, and the rotation of the spiral auger causes the dust in the sand storage bucket to be quantitatively and uniformly transported to the air duct, and then blown out into the wind sand test box through the air duct.

5. The wind and sand test chamber for explosion-proof testing according to claim 1, characterized in that: A heating wire is installed inside the heating box, and a thermostat is electrically connected to the heating wire, and the temperature of the heating wire is controlled by the thermostat.

6. The wind and sand test chamber for explosion-proof testing according to claim 1, characterized in that: A filter is fixedly provided on one end of the exhaust pipe extending into the wind and sand test box.

7. The wind and sand test chamber for explosion-proof testing according to claim 1, characterized in that: The atomizing nozzle group includes: a plurality of atomizing nozzles with a switch structure.

8. A method for operating a wind and sand test chamber for explosion-proof testing, characterized in that: include: Step 1: Operate the PLC controller to control the frequency converter to make the fan reach the required speed; Step 2: Synchronously, operate the PLC controller to control the thermostat, so that the heating wire heats up and simulates the required temperature; Step 3: Synchronously, operate the PLC controller to control the speed of the stepper motor, drive the spiral auger to rotate, so that the dust and sand in the sand storage bucket are quantitatively and uniformly transported into the air duct, and blown into the wind sand test box through the air duct; Step 4: When a salt spray environment is required, the PLC controller is synchronously operated to control the variable frequency water pump to spray seawater into the test chamber through the atomizing nozzle group.

9. A non-transitory computer-readable storage medium, characterized in that When the instructions in the storage medium are executed by a PLC controller, the PLC controller is enabled to perform the method according to claim 8.

10. A computer program product, characterized in that When the instructions in the computer program product are executed by a PLC controller, the PLC controller is enabled to perform the method according to claim 8 .

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