Foam layer thickness monitoring device and flotation equipment

Abstract

The utility model discloses a foam layer thickness monitoring device and flotation equipment, which are applied to the technical field of detection equipment, are used for solving the problem of poor measurement accuracy of a flotation foam layer thickness monitoring device in the prior art, and specifically comprise a height monitoring module, a cleaning mechanism and a control module, the height monitoring module is arranged above the flotation machine, and the height monitoring module is used for detecting the ore pulp height and the foam height in the flotation machine; the height monitoring module comprises a measuring mechanism, the spraying end of the cleaning mechanism faces the measuring mechanism, and the cleaning mechanism is used for cleaning the measuring mechanism of the height monitoring module; the control module is electrically connected with the height monitoring module and the cleaning mechanism. Thus, the spraying end of the cleaning mechanism is arranged towards the measuring mechanism, so that the cleaning mechanism cleans the measuring mechanism of the height monitoring module, the situation that the measuring mechanism adheres to substances such as minerals, silt and foam, and consequently the detection result is inaccurate is avoided, and the measuring precision of the flotation foam layer thickness monitoring device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a foam layer thickness monitoring device and a flotation device. Background Art

[0002] The thickness of the flotation foam layer is one of the important parameters that affect the quality and recovery rate of coal slime flotation products. If the foam layer is too thick, the concentrate product will be separated from the adsorption of the foam layer and fall back into the tailings slurry, resulting in a low concentrate yield, increased ash content of the tailings product, and increased energy consumption; while if the foam layer is too thin, the non-combustible gangue will not fall back into the tailings slurry in time and will be collected by the scraping mechanism into the flotation concentrate collection tank, resulting in a decrease in the ash content of the concentrate product. Therefore, the thickness data of the flotation machine foam layer is monitored, and the flotation machine slurry level, aeration volume, and frother dosage are adjusted according to this data to control the thickness of the foam layer and ensure the quality of the flotation product.

[0003] At present, the measurement methods of existing flotation foam layer thickness monitoring devices are mainly divided into impedance type, liquid level type and optical type. The impedance type flotation foam layer thickness monitoring device compares the position of the impedance mutation with the electrode rod of known length to obtain the thickness of each layer, but the electrode rod is easily adsorbed by minerals, resulting in a large impedance measurement error. The liquid level type flotation foam layer thickness monitoring device sets a float liquid level to measure the slurry level height, and uses a laser rangefinder or ultrasonic level meter to measure the height from the foam origin to the surface. The heights measured by the two are subtracted to obtain the foam layer, but the lifting rod as a moving element in the float liquid level meter will cause the sliding to be unsmooth or even stuck due to the adhesion of the foam, resulting in poor slurry level measurement accuracy; and when the foam carries less minerals, the laser or ultrasonic wave will pass through the foam, so that the height of the foam surface cannot be measured. The optical flotation foam layer thickness monitoring device is based on the uniform light obtained by processing white light through a soft light barrel. The light intensity at the boundary between the air, foam layer and slurry layer has a large fault. The height of each layer can be calculated based on the spacing and number of point light intensity sensors. However, the soft light barrel is easily adsorbed by minerals or impurities, resulting in inaccurate measurement results. In summary, the existing flotation foam layer thickness monitoring devices all have the problem of being unable to accurately measure the thickness of the foam layer. Utility Model Content

[0004] The embodiment of the utility model provides a foam layer thickness monitoring device and a flotation device, which are used to solve the problem of poor measurement accuracy of the flotation foam layer thickness monitoring device in the prior art.

[0005] The technical solution provided by the embodiment of the utility model is as follows:

[0006] On the one hand, an embodiment of the utility model provides a foam layer thickness monitoring device, including: a height monitoring module, a cleaning mechanism and a control module;

[0007] The height monitoring module is arranged above the flotation machine, and is used to detect the pulp height and foam height in the flotation machine;

[0008] The height monitoring module includes a measuring mechanism, a spray end of the cleaning mechanism is arranged toward the measuring mechanism, and the cleaning mechanism is used to clean the measuring mechanism of the height monitoring module;

[0009] The control module is electrically connected to the height monitoring module and the cleaning mechanism respectively.

[0010] In a possible implementation, the cleaning mechanism includes: a first solenoid valve, a water pump, a first nozzle, and a liquid filter;

[0011] The first end of the first solenoid valve is connected to an external water source through a pipeline, the second end of the first solenoid valve is connected to the water inlet end of the water pump through the water inlet pipeline, and the water outlet end of the water pump is connected to the first nozzle through the water outlet pipeline; the liquid filter is arranged on the water inlet pipeline; the control end of the first solenoid valve is connected to the control module.

[0012] In a possible implementation, the cleaning mechanism further includes: an air filter, an air storage tank, a second nozzle, an air pump, and a second solenoid valve;

[0013] The first end of the air filter is connected to an external air source, the second end of the air filter is connected to the air inlet end of the air storage tank via an air inlet pipeline, and the air outlet end of the air storage tank is connected to the second nozzle via an air outlet pipeline; the air pump is arranged on the air inlet pipeline, and the second solenoid valve is arranged on the air outlet pipeline; the control end of the second solenoid valve is connected to the control module.

[0014] In a possible implementation manner, the first nozzle and the second nozzle are nozzles with adjustable directions.

[0015] In a possible implementation, the height monitoring module includes: a slurry height measuring mechanism and a foam height measuring mechanism;

[0016] The slurry height measuring mechanism includes: a magnetostrictive displacement sensor, a magnetic ring, a moving element and a floating element;

[0017] The moving element comprises a hollow connecting rod and a probe rod of a magnetostrictive displacement sensor, the probe rod of the magnetostrictive displacement sensor is arranged in the hollow connecting rod, the magnetic ring is fixed to one end of the hollow connecting rod close to the magnetostrictive displacement sensor, and the floating element is fixed to one end of the hollow connecting rod away from the magnetostrictive displacement sensor.

[0018] In a possible implementation manner, a vent hole is provided on the tube body at one end of the hollow connecting rod away from the magnetostrictive displacement sensor.

[0019] In a possible implementation, the floating element is made of polytetrafluoroethylene material, and / or the hollow connecting rod is made of polytetrafluoroethylene material.

[0020] In a possible implementation, the foam height measuring mechanism includes: a radar rangefinder and a height adjustment slide;

[0021] The height adjustment slide is arranged above the flotation machine; the radar rangefinder is fixed on the slider of the height adjustment slide through a connecting plate.

[0022] In a possible implementation, the control module includes: a switching power supply, a serial port server, a controller, and an output module;

[0023] The input end of the switching power supply is connected to the external power supply, the first output end of the switching power supply is connected to the power supply end of the height monitoring module, the second output end of the switching power supply is connected to the power supply end of the controller, and the third output end of the switching power supply is connected to the power supply end of the serial port server;

[0024] The input end of the serial port server is connected to the data output end of the height monitoring module, and the output end of the serial port server is connected to the controller;

[0025] The output end of the controller is connected with the cleaning mechanism through the output module.

[0026] On the other hand, an embodiment of the present utility model provides a flotation device, including: the above-mentioned foam layer thickness monitoring device and flotation machine provided in the embodiment of the present utility model;

[0027] The foam layer thickness monitoring device is arranged above the flotation machine.

[0028] The beneficial effects of the embodiments of the utility model are as follows:

[0029] In the embodiment of the utility model, the spray end of the cleaning mechanism is arranged toward the measuring mechanism so that the cleaning mechanism cleans the measuring mechanism of the height monitoring module, thereby preventing the measuring mechanism from adhering to minerals, silt, foam and other substances, which may cause inaccurate detection results, and improving the measurement accuracy of the flotation foam layer thickness monitoring device.

[0030] Other features and advantages of the utility model will be described in the subsequent description, and partly will become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of the first structure of the foam layer thickness monitoring device in the embodiment of the utility model;

[0033] Figure 2 This is a schematic diagram of the second structure of the foam layer thickness monitoring device in the embodiment of the utility model;

[0034] Figure 3 This is a schematic diagram of a third structure of the foam layer thickness monitoring device in an embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of a fourth structure of the foam layer thickness monitoring device in an embodiment of the utility model;

[0036] Figure 5 This is a fifth structural schematic diagram of the foam layer thickness monitoring device in the embodiment of the utility model;

[0037] Figure 6 This is a sixth structural schematic diagram of the foam layer thickness monitoring device in the embodiment of the utility model;

[0038] Figure 7 It is a schematic diagram of the structure of the flotation equipment in the embodiment of the utility model. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] The present invention provides a foam layer thickness monitoring device 100. Figure 1 As shown, the foam layer thickness monitoring device 100 at least includes: a height monitoring module 110, a cleaning mechanism 120 and a control module 130;

[0041] The height monitoring module 110 is disposed above the flotation machine, and the height monitoring module 110 is used to detect the pulp height and foam height in the flotation machine;

[0042] The height monitoring module 110 includes a measuring mechanism, and the spray end of the cleaning mechanism 120 is arranged toward the measuring mechanism, and the cleaning mechanism 120 is used to clean the measuring mechanism of the height monitoring module 110;

[0043] The control module 130 is electrically connected to the height monitoring module 110 and the cleaning mechanism 120 respectively.

[0044] In such Figure 1 In the foam layer thickness monitoring device 100 shown, the height monitoring module 110 is mainly used to detect the slurry height and foam height through the measuring mechanism in the module, wherein the type of the measuring mechanism can be impedance type, liquid level type or optical type. The cleaning module mainly uses its spray end to clean the measuring mechanism of the height monitoring module 110 to avoid the problem of inaccurate detection results caused by the adhesion of minerals, silt and foam and other substances to the measuring mechanism. When the type of the measuring mechanism is impedance type, the spray end of the cleaning module is set toward the electrode rod in the measuring mechanism to avoid the electrode rod being adsorbed by minerals, resulting in a large impedance measurement error. When the type of the measuring mechanism is liquid level type, the spray end of the cleaning module is set toward the lifting rod as a moving element in the measuring mechanism to avoid the moving element from sliding unsmoothly or even stuck due to adhesion of foam, resulting in poor slurry level measurement accuracy. When the type of the measuring mechanism is optical, the spray end of the cleaning module is set toward the soft light barrel in the measuring mechanism to avoid the soft light barrel being adsorbed by minerals or impurities, resulting in inaccurate measurement results. The control module 130 is mainly used to control the cleaning mechanism 120 to start or stop cleaning the measuring mechanism of the height monitoring module 110. The control module 130 is also used to receive the pulp height and foam height in the flotation machine detected by the height monitoring module 110, and determine the foam layer thickness based on the pulp height and foam height.

[0045] In this way, by setting the spray end of the cleaning mechanism toward the measuring mechanism, the cleaning mechanism cleans the measuring mechanism of the height monitoring module, thereby avoiding the adhesion of minerals, silt, foam and other substances to the measuring mechanism, which may cause inaccurate detection results, and improving the measurement accuracy of the flotation foam layer thickness monitoring device, so that the flotation foam layer thickness monitoring device can measure the thickness of the flotation machine foam layer stably and with high precision for a long time, providing data reference for flotation dosing control and product quality control.

[0046] In specific implementation, in the foam layer thickness monitoring device 100 provided in the embodiment of the present application, the cleaning mechanism 120 has a variety of structures to realize its functions, for example Figure 2 As shown, the cleaning mechanism 120 may specifically include: a first solenoid valve 121, a water pump 122, a first nozzle 123 and a liquid filter 124;

[0047] The first end of the first solenoid valve 121 is connected to an external water source through a pipeline, the second end of the first solenoid valve 121 is connected to the water inlet end of the water pump 122 through an inlet pipeline, and the water outlet end of the water pump 122 is connected to the first nozzle 123 through an outlet pipeline; the liquid filter 124 is arranged on the inlet pipeline; the control end of the first solenoid valve 121 is connected to the control module 130.

[0048] In such Figure 2 In the foam layer thickness monitoring device 100 shown, the first electromagnetic valve 121 is used to connect or disconnect the water pump 122 from the external water source. The water pump 122 is used to transport the liquid provided by the external water source to the water outlet pipeline. The water pump 122 can also increase the liquid pressure in the water outlet pipeline. The water pump 122 can be a liquid micro plunger pump. The first nozzle 123 is used to spray the liquid to the measuring mechanism of the height monitoring module 110 evenly according to the liquid pressure. The liquid filter 124 is mainly used to purify the liquid input from the external water source and filter out impurities in the liquid. The liquid filter 124 can be a Y-type filter. When the first electromagnetic valve 121 is opened, the liquid provided by the external water source passes through the first electromagnetic valve 121, the liquid filter 124, and the water pump 122 in sequence and then sprays out from the first nozzle 123. The high-pressure liquid sprayed by the first nozzle 123 is used to wash away the minerals, silt, foam and other substances adhering to the measuring mechanism of the height monitoring module 110, so as to avoid the problem of inaccurate measurement of the measuring mechanism due to minerals, silt, foam and other substances.

[0049] In one embodiment, see Figure 3 As shown, the cleaning mechanism 120 of the foam layer thickness monitoring device 100 may further include: an air filter 125, an air storage tank 126, a second nozzle 127, an air pump 128 and a second solenoid valve 129;

[0050] The first end of the air filter 125 is connected to an external air source, the second end of the air filter 125 is connected to the air inlet end of the air tank 126 via an air inlet pipeline, and the air outlet end of the air tank 126 is connected to the second nozzle 127 via an air outlet pipeline; the air pump 128 is arranged on the air inlet pipeline, and the second solenoid valve 129 is arranged on the air outlet pipeline; the control end of the second solenoid valve 129 is connected to the control module 130.

[0051] In such Figure 3In the foam layer thickness monitoring device 100 shown, the air filter 125 is used to purify the gas input from the external gas source and filter out impurities in the gas. The air pump 128 is used to compress the gas provided by the external gas source and transport the compressed gas to the gas storage tank 126. The air pump 128 can be a gas micro piston pump or a diaphragm pump. The gas storage tank 126 is used to store compressed gas. A pressure gauge can also be installed on the gas storage tank 126 to detect the pressure value inside the gas storage tank 126. The second solenoid valve 129 is used to connect or disconnect the gas outlet pipeline, that is, to disconnect or connect the connection between the output end of the gas storage tank 126 and the second nozzle 127. The second nozzle 127 is used to spray the gas evenly according to the gas pressure to the measuring mechanism of the height monitoring module 110. The air pump 128 compresses the gas provided by the external gas source and delivers the compressed gas to the gas tank 126. When the second solenoid valve 129 is opened, the gas in the gas tank 126 is sprayed out from the second nozzle 127. The high-pressure gas sprayed from the second nozzle 127 is used to dry the residual liquid on the measuring mechanism after cleaning.

[0052] It is worth mentioning that the first nozzle 123 and the second nozzle 127 are nozzles with adjustable directions. By adjusting the direction of the first nozzle 123, the nozzle can be aimed at the position in the measuring mechanism that needs to be cleaned, thereby ensuring the effectiveness and accuracy of the cleaning. By adjusting the direction of the second nozzle 127, the nozzle can be aimed at the position of the liquid remaining on the measuring mechanism after cleaning, thereby drying the remaining part of the liquid in a more targeted manner, shortening the drying time and reducing the waste of resources.

[0053] In the foam layer thickness monitoring device 100 provided in the embodiment of the present application, the height monitoring module 110 includes a slurry height measuring mechanism 111 and a foam height measuring mechanism 112, wherein the slurry height measuring mechanism 111 is used to measure the slurry height; and the foam height measuring mechanism 112 is used to measure the foam height. In specific implementation, the slurry height measuring mechanism 111 has a variety of structures to realize its function, such as Figure 4 As shown, the slurry height measuring mechanism 111 may specifically include: a magnetostrictive displacement sensor 1101, a magnetic ring 1102, a moving element and a floating element 1103;

[0054] The moving element includes a hollow connecting rod 1104 and a probe rod 1105 of the magnetostrictive displacement sensor 1101. The probe rod 1105 of the magnetostrictive displacement sensor 1101 is arranged in the hollow connecting rod 1104. The magnetic ring 1102 is fixed to one end of the hollow connecting rod 1104 close to the magnetostrictive displacement sensor 1101. The floating element 1103 is fixed to one end of the hollow connecting rod 1104 away from the magnetostrictive displacement sensor 1101.

[0055] In such Figure 4In the foam layer thickness monitoring device 100 shown, the magnetic ring 1102 is fixed to one end of the hollow connecting rod 1104 through a non-magnetic nut, and the floating element 1103 is connected to the hollow screw through a screw, so that the floating element 1103 is fixed to the other end of the hollow connecting rod 1104, and the probe 1105 of the magnetostrictive displacement sensor 1101 is inserted into the assembled hollow connecting rod 1104 from the end of the hollow connecting rod 1104 fixed with the magnetic ring 1102. The floating element 1103 can be a conical float or a hollow float. During use, the floating element 1103 is placed in the flotation machine. Because the various components in the slurry height measuring mechanism 111 are heavy, the floating element 1103 will not be floated by the foam, but the floating element 1103 will be suspended on the surface of the slurry. When the slurry level changes, the conical float floats up and down following the slurry level, and drives the magnetic ring 1102 to move vertically along the probe rod 1105 of the magnetostrictive displacement sensor 1101 through the hollow connecting rod 1104, so that the magnetostrictive displacement sensor 1101 measures the slurry level height.

[0056] In one embodiment, in order to prevent the slurry from entering the hollow portion of the hollow connecting rod 1104 and causing the hollow connecting rod 1104 to be blocked, refer to Figure 4 As shown, a vent hole 1106 is provided on the tube body of the hollow connecting rod 1104 at one end away from the magnetostrictive displacement sensor 1101. In practical applications, uneven feeding and fluctuation of the aeration amount of the flotation machine may cause the slurry to enter the hollow part of the hollow connecting rod 1104 and cause blockage. By reserving a drainage hole at the bottom of the hollow connecting rod 1104, the slurry entering the hollow part of the hollow connecting rod 1104 can be discharged, thereby avoiding the problem of blockage of the hollow connecting rod 1104.

[0057] In one embodiment, the floating element is made of polytetrafluoroethylene material, and / or the hollow connecting rod is made of polytetrafluoroethylene material. The hollow connecting rod is made of polytetrafluoroethylene material, which can prevent the magnetically conductive material from affecting the measurement accuracy of the magnetostrictive displacement sensor and reduce friction. The floating element is made of polytetrafluoroethylene material, which can prevent the slurry from adhering to the float and facilitate cleaning.

[0058] In specific implementation, in the foam layer thickness monitoring device 100 provided in the embodiment of the present application, the foam height measuring mechanism 112 has a variety of structures to realize its function, for example Figure 5 As shown, the foam height measuring mechanism 112 may specifically include: a radar rangefinder 1107 and a height adjustment slide 1108;

[0059] The height adjustment slide 1108 is arranged above the flotation machine; the radar rangefinder 1107 is fixed on the slider of the height adjustment slide 1108 through a connecting plate.

[0060] In such Figure 5In the foam layer thickness monitoring device 100 shown, the radar rangefinder 1107 is used to measure the foam height. The height adjustment slide 1108 is used to place the radar rangefinder 1107 and adjust the distance between the radar rangefinder 1107 and the foam layer in the flotation machine to avoid the influence of the radar rangefinder 1107 being blocked or the low signal quality on the measurement, and to ensure the accuracy of the measurement of the radar rangefinder 1107. The radar rangefinder 1107 can be a millimeter wave radar rangefinder 1107. Specifically, the millimeter wave radar rangefinder 1107 can operate at a specific frequency to improve the measurement accuracy of the foam surface height of the flotation machine. Preferably, the millimeter wave radar operating frequency is 80GHz. The radar rangefinder 1107 is fixed to the slider of the height adjustment slide 1108 through a connecting plate. The slider of the height adjustment slide 1108 can move up and down along the slide rail of the height adjustment slide 1108. After the height position of the radar rangefinder 1107 is adjusted, the position of the slider can be fixed by tightening the nut.

[0061] In specific implementation, in the foam layer thickness monitoring device 100 provided in the embodiment of the present application, the control module 130 has a variety of structures to realize its functions, for example Figure 6 As shown, the control module 130 may specifically include: a switching power supply 131, a serial port server 132, a controller 133 and an output module 134;

[0062] The input end of the switching power supply 131 is connected to an external power supply, the first output end of the switching power supply 131 is connected to the power supply end of the height monitoring module, the second output end of the switching power supply 131 is connected to the power supply end of the controller 133, and the third output end of the switching power supply 131 is connected to the power supply end of the serial port server 132;

[0063] The input end of the serial port server 132 is connected to the data output end of the height monitoring module, and the output end of the serial port server 132 is connected to the controller 133;

[0064] The output end of the controller 133 is connected to the cleaning mechanism 120 through the output module 134 .

[0065] In such Figure 6In the foam layer thickness monitoring device 100 shown, the switch power supply 131 is used to power the height monitoring module, the controller 133, and the serial port server 132. Specifically, 220V AC can be converted into 24V DC. The serial port server 132 is used to convert the data collected by the slurry height measuring mechanism 111, the foam height measuring mechanism 112, the radar rangefinder 1107, and the pressure gauge on the gas storage tank 126 into the controller 133. The controller 133 is used to calculate the foam layer height according to the data collected by the slurry height measuring mechanism 111 and the foam height measuring mechanism 112. The controller 133 is also used to control the cleaning mechanism 120 to spray water and blow air according to the preset time, that is, to control the start and stop of the water pump 122, the start and stop of the air pump 128, the opening and closing of the first solenoid valve 121, and the opening and closing of the second solenoid valve 129 through the output module 134. The controller 133 can be an embedded industrial computer or a PLC (Programmable Logic Controller).

[0066] In one embodiment, a switch may also be provided in the control module, and the switch is used for communication between the foam layer thickness monitoring device and external equipment to realize data interaction.

[0067] Based on the same concept, the present utility model embodiment also provides a flotation device, see Figure 7 As shown, the flotation equipment 200 at least comprises: the above-mentioned foam layer thickness monitoring device 100 and a flotation machine 210 provided in the embodiment of the utility model;

[0068] The foam layer thickness monitoring device 100 is disposed above the flotation machine 210 .

[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0070] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A foam layer thickness monitoring device, characterized in that: include: Height monitoring module, cleaning mechanism and control module; The height monitoring module is arranged above the flotation machine, and is used to detect the pulp height and foam height in the flotation machine; The height monitoring module comprises a measuring mechanism, the spray end of the cleaning mechanism is arranged toward the measuring mechanism, and the cleaning mechanism is used to clean the measuring mechanism of the height monitoring module; The control module is electrically connected to the height monitoring module and the cleaning mechanism respectively.

2. The foam layer thickness monitoring device according to claim 1, characterized in that: The cleaning mechanism comprises: a first solenoid valve, a water pump, a first nozzle and a liquid filter; The first end of the first solenoid valve is connected to an external water source through a pipeline, the second end of the first solenoid valve is connected to the water inlet end of the water pump through a water inlet pipeline, and the water outlet end of the water pump is connected to the first nozzle through a water outlet pipeline; the liquid filter is arranged on the water inlet pipeline; the control end of the first solenoid valve is connected to the control module.

3. The foam layer thickness monitoring device according to claim 2, characterized in that: The cleaning mechanism also includes: an air filter, an air storage tank, a second nozzle, an air pump and a second solenoid valve; The first end of the air filter is connected to an external air source, the second end of the air filter is connected to the air inlet end of the air tank via an air inlet pipeline, and the air outlet end of the air tank is connected to the second nozzle via an air outlet pipeline; the air pump is arranged on the air inlet pipeline, and the second solenoid valve is arranged on the air outlet pipeline; the control end of the second solenoid valve is connected to the control module.

4. The foam layer thickness monitoring device according to claim 3, characterized in that: The first nozzle and the second nozzle are nozzles with adjustable directions.

5. The foam layer thickness monitoring device according to any one of claims 1 to 4, characterized in that: The height monitoring module includes: a slurry height measuring mechanism and a foam height measuring mechanism; The slurry height measuring mechanism comprises: a magnetostrictive displacement sensor, a magnetic ring, a moving element and a floating element; The moving element includes a hollow connecting rod and a probe rod of the magnetostrictive displacement sensor, the probe rod of the magnetostrictive displacement sensor is arranged in the hollow connecting rod, the magnetic ring is fixed to one end of the hollow connecting rod close to the magnetostrictive displacement sensor, and the floating element is fixed to one end of the hollow connecting rod away from the magnetostrictive displacement sensor.

6. The foam layer thickness monitoring device according to claim 5, characterized in that: A vent hole is arranged on the tube body of the hollow connecting rod at one end away from the magnetostrictive displacement sensor.

7. The foam layer thickness monitoring device according to claim 5, characterized in that: The floating element is made of polytetrafluoroethylene material, and / or the hollow connecting rod is made of polytetrafluoroethylene material.

8. The foam layer thickness monitoring device according to claim 5, characterized in that: The foam height measuring mechanism comprises: a radar rangefinder and a height adjustment slide; The height adjustment slide is arranged above the flotation machine; the radar rangefinder is fixed on the slider of the height adjustment slide through a connecting plate.

9. The foam layer thickness monitoring device according to claim 8, characterized in that: The control module includes: a switching power supply, a serial port server, a controller and an output module; The input end of the switching power supply is connected to an external power supply, the first output end of the switching power supply is connected to the power supply end of the height monitoring module, the second output end of the switching power supply is connected to the power supply end of the controller, and the third output end of the switching power supply is connected to the power supply end of the serial port server; The input end of the serial port server is connected to the data output end of the height monitoring module, and the output end of the serial port server is connected to the controller; The output end of the controller is connected to the cleaning mechanism through the output module.

10. A flotation device, characterized in that: include: The foam layer thickness monitoring device and flotation machine according to any one of claims 1 to 9; The foam layer thickness monitoring device is arranged above the flotation machine.

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