Device and method for detecting thickness of upper-layer foam of flotation tank

Abstract

The invention relates to the technical field of flotation, and discloses a flotation cell upper layer foam thickness detection device and method, which comprises a lifting seat, an outer pipe arranged at the bottom of the lifting seat, an adjustable auxiliary detection piece arranged on the peripheral side surface of the outer pipe, an inner pipe arranged in the outer pipe, and the bottom of the inner pipe connected with the inner side surface of the outer pipe through an annular plate. Uniformly distributed purging holes are formed in the annular plate, a main pipeline connected with an external high-pressure air pump is arranged on the outer pipe, and a detection rod capable of moving up and down is arranged in the inner pipe in a sliding manner. The ore pulp liquid level is exposed outside through high-pressure purging, fuzzy interference of the interface of the foam layer is eliminated, the thickness of the foam layer is detected by detecting the distance between the top of the foam layer and the ore pulp liquid level, the detection effect is more visual and reliable, the detection precision is high, the working condition adaptability is high, and the method is not easily influenced by the external environment; and the contact part of the ore pulp and the foam can be directly purged and cleaned after the detection is finished, so that the operation is convenient.

Description

Technical Field

[0001] The present invention relates to the field of flotation technology, in particular to a device and method for detecting the thickness of upper foam in a flotation tank. Background Art

[0002] Flotation is a mineral processing method that separates minerals based on differences in their surface physical and chemical properties (primarily hydrophilicity / hydrophobicity). It is widely used in the separation of metals and non-metallic minerals (such as copper, lead, zinc, gold, phosphorus, and coal), as well as in wastewater and residue recovery. The froth layer is the separation interface during the flotation process, and its thickness directly determines concentrate grade and metal recovery. If the froth layer is too thin, the scrapers easily dig into the slurry, resulting in a large amount of gangue inclusions in the concentrate, lowering the grade, and discharging poorly floatable minerals before they are fully mineralized. If the froth layer is too thick, the bubbles in the upper layer merge and rupture, causing the adsorbed coarse minerals to fall off and sink heavily, resulting in excessive secondary enrichment, a sudden increase in the concentrate moisture content, and increased dehydration costs.

[0003] Currently, mainstream foam thickness measurement technologies face three major bottlenecks: low accuracy, poor anti-interference capabilities, and frequent maintenance. Ultrasonic testing (e.g., CN205027383U) suffers from acoustic scattering distortion: the porous structure of the foam layer results in an acoustic attenuation rate exceeding 60%, resulting in errors of ±15mm for thicknesses greater than 200mm. It also suffers from poor adaptability to operating conditions: fluctuations in slurry concentration can further amplify errors. Mechanical float detection also suffers from the tendency of the float to become coated with minerals, which can increase its weight and reduce measurement accuracy. Regular maintenance is also required. Furthermore, manual observation is subject to significant subjective influences, which can increase errors. Machine vision is susceptible to interference from water mist and light.

[0004] The above-mentioned defects of low detection accuracy and large errors in detection results due to environmental influences can lead to a chain reaction of process out of control: thickness inaccuracy → excessive addition of foaming agent → excessive foam stability → tank leakage accident; therefore, the present invention provides a flotation tank upper foam thickness detection device and detection method to solve the above-mentioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a flotation tank upper foam thickness detection device and detection method. High-pressure blowing is used to expose the slurry surface to the outside, eliminating the fuzzy interference of the foam layer interface, and the foam layer thickness is detected by detecting the distance between the top of the foam layer and the slurry surface. The detection effect is more intuitive and reliable, the detection accuracy is high, the adaptability to working conditions is strong, and it is not easily affected by the external environment. After the detection, the contact parts with the slurry and foam can be directly blown and cleaned. The operation is convenient and can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a device and method for detecting the thickness of the upper layer of foam in a flotation tank, comprising a lifting seat, an outer tube provided at the bottom of the lifting seat, an adjustable auxiliary detection member provided on the outer peripheral side of the outer tube for detecting the position of the top of the foam layer, the auxiliary detection member comprising a secondary mounting seat and a secondary indicator light, a secondary float provided at the bottom of the secondary mounting seat, and an auxiliary microswitch for controlling the operation of the secondary indicator light provided between the secondary mounting seat and the secondary float; An inner tube is provided inside the outer tube, and the bottom of the inner tube is connected to the inner side surface of the outer tube through an annular plate, and evenly distributed purge holes are provided on the annular plate. A main pipeline connected to an external high-pressure air pump is provided on the outer tube, and a detection rod that can move up and down is slidingly provided inside the inner tube. A main detection part for detecting the top position of the slurry is provided at the bottom of the detection rod, and the main detection part includes a main mounting seat installed at the bottom of the detection rod and a main indicator light installed inside the detection rod. A main float is provided at the bottom of the main mounting seat, and a main micro switch for controlling the operation of the main indicator light is provided between the main mounting seat and the main float.

[0007] As a preferred technical solution of the present invention, the lifting seat includes an electric push rod, a clamping plate is provided on the side of the fixed end of the electric push rod, and a connecting plate connected to the outer tube is provided at the telescopic end of the electric push rod.

[0008] As a preferred technical solution of the present invention, the outer peripheral side movable sleeve of the outer tube is provided with a sliding sleeve, and the peripheral side surface of the sliding sleeve is rotatably connected to a plurality of adjusting rods through a rotating shaft composed of bolts and nuts, and the auxiliary mounting seat is installed at the bottom of the adjusting rod, and the auxiliary indicator light is installed on the side of the adjusting rod.

[0009] As a preferred technical solution of the present invention, a fastening bolt is threadedly connected inside the screw hole on the side of the sliding sleeve.

[0010] As a preferred technical solution of the present invention, the detection rod is a transparent rod, and the top of the detection rod is provided with an elastic telescopic tube connected to the top of the inner tube cavity, and the top of the outer tube is provided with a secondary pipeline connected to the elastic telescopic tube, and the secondary pipeline is connected to an external high-pressure air pump.

[0011] As a preferred technical solution of the present invention, a branch pipe is provided on the side of the secondary pipeline, and a connecting pipe is provided on the branch pipe. An extrusion sleeve is installed in the annular groove at the lower end of the inner side surface of the inner tube, and the extrusion sleeve is connected to the connecting pipe, and a three-way valve is provided at the corresponding position of the secondary pipeline and the branch pipe.

[0012] As a preferred technical solution of the present invention, a pressure relief pipe is provided on the side of the connecting pipe, and a pressure relief valve is provided on the pressure relief pipe.

[0013] A method for detecting the thickness of the upper foam layer of a flotation tank comprises the following steps: S1. Turn the adjustment rod according to the detection range at the top of the foam layer to adjust the inclination angle of the adjustment rod and tighten the nut; then adjust the sliding sleeve up and down along the outer tube and turn the fastening bolt to lock the sliding sleeve; S2. Attach the device to a certain height above the flotation tank through a clamping plate, keep the electric push rod in a vertical state, and then control the extension of the electric push rod through an external PLC controller. The electric push rod pushes the outer tube downward through the connecting plate, and the outer tube drives the adjustment rod downward through the sliding sleeve. When the auxiliary float contacts the foam, the auxiliary float is subjected to resistance, causing the auxiliary micro switch to close, thereby controlling the auxiliary indicator light to light up, and at the same time, the auxiliary micro switch transmits a signal to the PLC controller; when the PLC controller receives signals from at least two auxiliary micro switches, the PLC controller controls the electric push rod to stop extending, and at this time the outer tube and the adjustment rod no longer move downward; S3. After the electric push rod stops extending, the PLC controller controls the electric push rod to control the external high-pressure air pump to work. The external high-pressure air pump inflates the outer pipe and the inner pipe through the main pipe. The high-pressure air is ejected through the purge hole, thereby blowing away the foam under the outer pipe and exposing the slurry level. S4. At the same time, external high-pressure air inflates the elastic expansion tube through the auxiliary pipe. After inflation, the elastic expansion tube extends and pushes the detection rod downward until the main float contacts the slurry surface. At this time, the main float is subjected to resistance and pushes the main micro switch to close. The main micro switch controls the main indicator light and transmits a signal to the PLC controller. The PLC controller controls the three-way valve to connect the auxiliary pipe with the connecting pipe. The air in the connecting pipe enters the extrusion sleeve, which expands to lock the detection rod in place. S5. The electric push rod is controlled to shorten by the PLC controller, and the electric push rod drives the outer tube, the detection rod and the adjustment rod to move upward. The height difference between the auxiliary float and the main float is measured to obtain the thickness of the foam layer on the flotation tank.

[0014] As a preferred technical solution of the present invention, in S5, after the thickness of the foam layer on the flotation tank is measured, the auxiliary pipeline is connected to the branch of the air inlet of the external high-pressure air pump, and a valve is set on the branch, and then the three-way valve is adjusted to connect the auxiliary pipeline with the elastic telescopic tube; then the external high-pressure air pump is controlled to work, and the external high-pressure air pump extracts the air inside the elastic telescopic tube to shorten it, thereby driving the detection rod to move upward, and during the upward movement, the high-pressure air sprayed from the purge hole purges and cleans the main float; when the detection rod moves to the inner tube, the branch valve is closed, and the adjusting rod is rotated to rotate the auxiliary float to the lower side of the outer tube, and the high-pressure air sprayed from the purge hole purges and cleans the auxiliary float.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the flotation tank upper foam thickness detection device and detection method of the present invention, high-pressure air can extend the elastic telescopic tube, thereby causing the elastic telescopic tube to push the detection rod to move, thereby facilitating the detection of the slurry level.

[0016] 2. In the device and method for detecting the thickness of the upper layer of foam in the flotation tank according to the present invention, high-pressure air is ejected through the purge hole, thereby blowing away the foam under the outer tube, exposing the slurry level and facilitating the detection of the slurry level.

[0017] 3. In the device and method for detecting the thickness of the upper layer of foam in the flotation tank according to the example of the present invention, the auxiliary pipeline is connected to the connecting pipe, and the air in the connecting pipe enters the extrusion sleeve. The extrusion sleeve expands to lock and position the detection rod, preventing the detection rod from sliding down under the action of gravity during the upward movement of the device, thereby improving the accuracy of the detection.

[0018] 4. The device and method for detecting the thickness of the upper layer of foam in the flotation tank of the present invention use high-pressure blowing to expose the slurry surface to the outside, eliminate the fuzzy interference of the foam layer interface, and detect the thickness of the foam layer by detecting the distance between the top of the foam layer and the slurry surface. The detection effect is more intuitive and reliable, with high detection accuracy, strong adaptability to working conditions, and is not easily affected by the external environment. After the detection, the contact parts with the slurry and foam can be directly blown and cleaned, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic cross-sectional view of the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the lower end of the detection rod in the present invention; Figure 4 It is a schematic cross-sectional structural diagram of the lower end of the adjusting rod in the present invention.

[0020] In the figure: 1 connecting plate, 2 electric push rod, 21 clamping plate, 3 outer pipe, 31 purge hole, 32 main pipe, 4 inner pipe, 41 extrusion sleeve, 5 detection rod, 51 elastic telescopic tube, 6 auxiliary pipe, 61 three-way valve, 62 connecting pipe, 63 pressure relief valve, 7 sliding sleeve, 71 adjusting rod, 8 main mounting seat, 81 main micro switch, 82 main float, 83 main indicator light, 9 auxiliary mounting seat, 91 auxiliary micro switch, 92 auxiliary float, 93 auxiliary indicator light. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-4 The present invention provides a technical solution: a device and method for detecting the thickness of the upper layer of foam in a flotation tank, comprising a lifting seat, characterized in that an outer tube 3 is provided at the bottom of the lifting seat, and an adjustable auxiliary detection member is provided on the outer peripheral side of the outer tube 3 for detecting the position of the top of the foam layer. The auxiliary detection member includes a secondary mounting seat 9 and a secondary indicator light 93. A secondary float 92 is provided at the bottom of the secondary mounting seat 9, and a secondary micro switch 91 for controlling the operation of the secondary indicator light 93 is provided between the secondary mounting seat 9 and the secondary float 92. When the secondary float 92 contacts the foam, the secondary float 92 is subjected to resistance, causing the secondary micro switch 91 to close, thereby controlling the secondary indicator light 93 to light up. An inner tube 4 is provided inside the outer tube 3, and the bottom of the inner tube 4 is connected to the inner side of the outer tube 3 through an annular plate. The annular plate is provided with evenly distributed purge holes 31. The outer tube 3 is provided with a main pipeline 32 connected to the external high-pressure air pump. A detection rod 5 that can move up and down is slidingly provided inside the inner tube 4. The bottom of the detection rod 5 is provided with a main detection part for detecting the top position of the slurry. The main detection part includes a main mounting seat 8 installed at the bottom of the detection rod 5 and a main indicator light 83 installed inside the detection rod 5. A main float 82 is provided at the bottom of the main mounting seat 8, and a main micro switch 81 for controlling the operation of the main indicator light 83 is provided between the main mounting seat 8 and the main float 82. After the main float 82 contacts the liquid surface of the slurry, the main float 82 is subjected to resistance to push the main micro switch 81 to close, and the main micro switch 81 controls the main indicator light 83 to light up.

[0023] There are at least two groups of purge holes 31 , one group is vertically downwardly arranged to blow away foam; the other side is inclined so that the blown high-pressure air is blown toward the middle of the lower side of the outer tube 3 .

[0024] Furthermore, the lifting seat includes an electric push rod 2, a clamping plate 21 is provided on the side of the fixed end of the electric push rod 2, and a connecting plate 1 connected to the outer tube 3 is provided at the telescopic end of the electric push rod 2 for controlling the initial movement of the outer tube 3.

[0025] Furthermore, a sliding sleeve 7 is provided on the outer peripheral side movable sleeve of the outer tube 3, and a plurality of adjusting rods 71 ​​are rotatably connected to the peripheral side of the sliding sleeve 7 through a rotating shaft composed of bolts and nuts, and the auxiliary mounting seat 9 is installed at the bottom of the adjusting rod 71, and the auxiliary indicator light 93 is installed on the side of the adjusting rod 71. The adjusting rod 71 can be locked by the rotating shaft composed of bolts and nuts. When the adjusting rod 71 rotates in the direction away from the outer tube 3, the detection range is large; when the adjusting rod 71 approaches the outer tube 3, the detection range is small, and the adjusting rod 71 can be locked by tightening the nut.

[0026] Furthermore, a fastening bolt is threadedly connected inside the screw hole on the side of the sliding sleeve 7, and the sliding sleeve 7 is fixed by the fastening bolt.

[0027] Furthermore, the detection rod 5 is a transparent rod, and the top of the detection rod 5 is provided with an elastic telescopic tube 51 connected to the top of the inner cavity of the inner tube 4, and the top of the outer tube 3 is provided with a secondary pipe 6 connected to the elastic telescopic tube 51. The secondary pipe 6 is connected to an external high-pressure air pump. The elastic telescopic tube 51 adopts a structure similar to a negative pressure drainage bottle and an elastic bellows; it shortens under negative pressure and expands by inflation. The length of the elastic telescopic tube 51 is controlled by inflation and exhaust, thereby controlling the extension and retraction of the detection rod 5.

[0028] Furthermore, a branch pipe is provided on the side of the auxiliary pipeline 6, and a connecting pipe 62 is provided on the branch pipe. An extrusion sleeve 41 is installed in the annular groove at the lower end of the inner side surface of the inner tube 4, and the extrusion sleeve 41 is connected to the connecting pipe 62, and a three-way valve 61 is provided at the corresponding position of the auxiliary pipeline 6 and the branch pipe. The extrusion sleeve 41 expands after inflation, which can lock and position the detection rod 5 to prevent the detection rod 5 from sliding down under the action of gravity during the upward movement of the device, thereby improving the accuracy of the detection.

[0029] Furthermore, a pressure relief pipe is provided on the side of the connecting pipe 62 , and a pressure relief valve 63 is provided on the pressure relief pipe. During the continuous inflation stage of the extrusion sleeve 41 , pressure is relieved through the pressure relief valve 63 to discharge excess gas.

[0030] A method for detecting the thickness of the upper foam layer of a flotation tank comprises the following steps: S1. Rotate the adjusting rod 71 according to the detection range of the top of the foam layer to adjust the inclination angle of the adjusting rod 71 and tighten the nut; then adjust the sliding sleeve 7 up and down along the outer tube 3 and tighten the sliding sleeve 7 by rotating the fastening bolt; S2. The device is clamped to a certain height above the upper side of the flotation tank by the clamping plate 21. After the electric push rod 2 is kept in a vertical state, the electric push rod 2 is controlled to extend by the external PLC controller. The electric push rod 2 pushes the outer tube 3 downward through the connecting plate 1. The outer tube 3 drives the adjusting rod 71 downward through the sliding sleeve 7. When the auxiliary float 92 contacts the foam, the auxiliary float 92 is subjected to resistance, causing the auxiliary micro switch 91 to close, thereby controlling the auxiliary indicator light 93 to light up. At the same time, the auxiliary micro switch 91 transmits a signal to the PLC controller; when the PLC controller receives signals from at least two auxiliary micro switches 91, the PLC controller controls the electric push rod 2 to stop extending. At this time, the outer tube 3 and the adjusting rod 71 no longer move downward. S3. After the electric push rod 2 stops extending, the PLC controller controls the electric push rod 2 to control the external high-pressure air pump to work. The external high-pressure air pump inflates the outer tube 3 and the inner tube 4 through the main pipe 32. The high-pressure air is ejected through the purge hole 31, thereby blowing away the foam under the outer tube 3 and exposing the slurry level. S4. Simultaneously, external high-pressure air inflates the elastic telescopic tube 51 through the auxiliary pipe 6. The elastic telescopic tube 51 extends after inflation and pushes the detection rod 5 downward until the main float 82 contacts the slurry surface. At this time, the main float 82 encounters resistance and pushes the main microswitch 81 to close. The main microswitch 81 controls the main indicator light 83 to light up, and the main microswitch 81 contacts and transmits a signal to the PLC controller. The PLC controller controls the three-way valve 61 to operate, connecting the auxiliary pipe 6 with the connecting pipe 62. The air in the connecting pipe 62 enters the extrusion sleeve 41, which expands to lock the detection rod 5 in place. S5. The PLC controller controls the electric push rod 2 to shorten, and the electric push rod 2 drives the outer tube 3, the detection rod 5 and the adjustment rod 71 to move upward. The height difference between the auxiliary float 92 and the main float 82 is measured to obtain the thickness of the foam layer on the flotation tank.

[0031] Furthermore, in S5, after the thickness of the foam layer on the flotation tank is measured, the auxiliary pipeline 6 is connected to the branch of the air inlet of the external high-pressure air pump, and a valve is set on the branch, and then the three-way valve 61 is adjusted to connect the auxiliary pipeline 6 with the elastic telescopic tube 51; then the external high-pressure air pump is controlled to work, and the external high-pressure air pump extracts the air inside the elastic telescopic tube 51 to shorten it, thereby driving the detection rod 5 to move upward. During the upward movement, the high-pressure air ejected from the purge hole 31 purges and cleans the main float 82; when the detection rod 5 moves to the inner tube 4, the branch valve is closed, and the adjusting rod 71 is rotated to rotate the auxiliary float 92 to the lower side of the outer tube 3, and the high-pressure air ejected from the purge hole 31 purges and cleans the auxiliary float 92.

[0032] When the adjusting rod 71 is in the same position and two measurements are taken before and after, if the slurry level is exposed when the air blown out of the purge hole 31 in the previous detection blows away the foam, and the air blown out of the purge hole 31 in the second detection does not blow away the foam, after excluding the influence of the high-pressure air pump, it means that the foam concentration has increased; at this time, the sliding sleeve 7 can be moved up along the outer tube 3 to reduce the height difference between the adjusting rod 71 and the outer tube 3, so that when the auxiliary float 92 contacts the foam, the height difference between the purge hole 31 and the foam is smaller, thereby improving the purge effect on the foam.

[0033] The entire process is as follows: preliminary commissioning and installation, detection of the top of the foam layer, blowing to expose the slurry surface, slurry surface detection, detection rod positioning, calculation of the foam layer thickness, and blowing and cleaning of the main float 82 and the auxiliary float 92. The entire detection process does not exceed five minutes, and the foam concentration can also be judged by the length of time the slurry surface is blown to expose.

[0034] The electric push rod 2, three-way valve 61, micro switch and indicator light used in the present invention are all commonly used electronic components in the prior art. Their working methods and circuit structures are well-known technologies and will not be described in detail here. The electric push rod 2, three-way valve 61, micro switch and indicator light are all electrically connected to the external PLC controller. When the micro switch is closed, it transmits a signal to the external PLC controller for processing.

[0035] The foam has a low density and will not quickly gather on the lower side of the outer tube 3 when blown away. The slurry has a high density. When high-pressure air is blown at a distance from the slurry interface, the slurry will flow to that position in real time. The foam thickness can be detected by detecting the height difference between the slurry liquid surface and the foam liquid surface.

[0036] The present invention adopts high-pressure blowing to expose the slurry surface to the outside, eliminates the fuzzy interference of the foam layer interface, and detects the thickness of the foam layer by detecting the distance between the top of the foam layer and the slurry surface. The detection effect is more intuitive and reliable, the detection accuracy is high, the adaptability to working conditions is strong, and it is not easily affected by the external environment. After the detection, the contact parts with the slurry and foam can be directly blown and cleaned, and the operation is convenient.

[0037] Any undisclosed portions of the present invention are prior art, and their specific structures, materials, and operating principles will not be described in detail. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device and method for detecting the thickness of the upper foam layer of a flotation tank, comprising a lifting seat, characterized in that: An outer tube (3) is provided at the bottom of the lifting seat, and an adjustable auxiliary detection member is provided on the outer peripheral side of the outer tube (3) for detecting the top position of the foam layer. The auxiliary detection member includes an auxiliary mounting seat (9) and an auxiliary indicator light (93). An auxiliary float (92) is provided at the bottom of the auxiliary mounting seat (9), and an auxiliary micro switch (91) for controlling the operation of the auxiliary indicator light (93) is provided between the auxiliary mounting seat (9) and the auxiliary float (92). An inner tube (4) is provided inside the outer tube (3), and the bottom of the inner tube (4) is connected to the inner side of the outer tube (3) through an annular plate, and the annular plate is provided with evenly distributed purge holes (31). The outer tube (3) is provided with a main pipeline (32) connected to an external high-pressure air pump, and a detection rod (5) that can move up and down is slidably provided inside the inner tube (4). The bottom of the detection rod (5) is provided with a main detection component for detecting the top position of the slurry, and the main detection component includes a main mounting seat (8) installed at the bottom of the detection rod (5) and a main indicator light (83) installed inside the detection rod (5). A main float (82) is provided at the bottom of the main mounting seat (8), and a main micro switch (81) for controlling the operation of the main indicator light (83) is provided between the main mounting seat (8) and the main float (82).

2. The device for detecting thickness of upper foam layer of flotation tank according to claim 1, characterized in that: The lifting seat comprises an electric push rod (2), a clamping plate (21) is provided on the side of the fixed end of the electric push rod (2), and a connecting plate (1) connected to the outer tube (3) is provided on the telescopic end of the electric push rod (2).

3. The device for detecting the thickness of the upper layer of foam in a flotation tank according to claim 2, characterized in that: The outer peripheral side movable sleeve of the outer tube (3) is provided with a sliding sleeve (7), and the peripheral side surface of the sliding sleeve (7) is rotatably connected to a plurality of adjusting rods (71) via a rotating shaft composed of bolts and nuts, and the auxiliary mounting seat (9) is installed at the bottom of the adjusting rod (71), and the auxiliary indicator light (93) is installed on the side of the adjusting rod (71).

4. The device for detecting thickness of upper foam layer of flotation cell according to claim 3, characterized in that: The screw hole on the side of the sliding sleeve (7) is internally threadedly connected with a fastening bolt.

5. The device for detecting thickness of upper foam layer of flotation cell according to claim 4, characterized in that: The detection rod (5) is a transparent rod, and the top of the detection rod (5) is provided with an elastic telescopic tube (51) that is in communication with the top of the inner cavity of the inner tube (4). The top of the outer tube (3) is provided with a secondary pipeline (6) that is in communication with the elastic telescopic tube (51), and the secondary pipeline (6) is connected to an external high-pressure air pump.

6. The device for detecting thickness of upper foam layer of flotation cell according to claim 5, characterized in that: A branch pipe is provided on the side of the auxiliary pipeline (6), and a connecting pipe (62) is provided on the branch pipe. An extrusion sleeve (41) is installed in the annular groove at the lower end of the inner side surface of the inner pipe (4), and the extrusion sleeve (41) is connected to the connecting pipe (62). A three-way valve (61) is provided at the corresponding position of the auxiliary pipeline (6) and the branch pipe.

7. The device for detecting thickness of upper foam layer of flotation cell according to claim 6, characterized in that: A pressure relief pipe is provided on the side of the connecting pipe (62), and a pressure relief valve (63) is provided on the pressure relief pipe.

8. A method for detecting the thickness of the upper foam layer of a flotation tank according to claim 7, characterized in that: The following steps are involved: S1. Rotate the adjusting rod (71) according to the detection range of the top of the foam layer, adjust the inclination angle of the adjusting rod (71), and tighten the nut; then adjust the sliding sleeve (7) up and down along the outer tube (3), and rotate the fastening bolt to lock and fix the sliding sleeve (7); S2. The device is connected to a certain height on the upper side of the flotation tank through the card plate (21), and the electric push rod (2) is kept in a vertical state. Then, the electric push rod (2) is controlled to extend through the external PLC controller. The electric push rod (2) pushes the outer tube (3) downward through the connecting plate (1), and the outer tube (3) drives the adjustment rod (71) downward through the sliding sleeve (7). When the auxiliary float (92) contacts the foam, the auxiliary float (92) is subjected to resistance, causing the auxiliary micro switch (91) to close, thereby controlling the auxiliary indicator light (93) to light up, and at the same time, the auxiliary micro switch (91) transmits a signal to the PLC controller; when the PLC controller receives signals from at least two auxiliary micro switches (91), the PLC controller controls the electric push rod (2) to stop extending, and at this time, the outer tube (3) and the adjustment rod (71) no longer move downward; S3, after the electric push rod (2) stops extending, the PLC controller controls the electric push rod (2) to control the external high-pressure air pump to work, and the external high-pressure air pump inflates the outer tube (3) and the inner tube (4) through the main pipe (32), and the high-pressure air is ejected through the purge hole (31), thereby blowing away the foam under the outer tube (3) and exposing the slurry level; S4. At the same time, external high-pressure air is inflated into the elastic telescopic tube (51) through the auxiliary pipe (6). After the elastic telescopic tube (51) is inflated, it stretches and pushes the detection rod (5) downward until the main float (82) contacts the slurry surface. At this time, the main float (82) is subjected to resistance and pushes the main micro switch (81) to close. The main micro switch (81) controls the main indicator light (83) to light up, and the main micro switch (81) contacts and transmits a signal to the PLC controller. The PLC controller controls the three-way valve (61) to work, so that the auxiliary pipe (6) is connected to the connecting pipe (62). The air in the connecting pipe (62) enters the extrusion sleeve (41), and the extrusion sleeve (41) expands to lock the detection rod (5). S5. The electric push rod (2) is controlled to shorten by the PLC controller, and the electric push rod (2) drives the outer tube (3), the detection rod (5) and the adjustment rod (71) to move upward. The height difference between the auxiliary float (92) and the main float (82) is measured to obtain the thickness of the foam layer on the flotation tank.

9. The detection method of the flotation tank upper foam thickness detection device according to claim 8, wherein: In S5, after the thickness of the foam layer on the flotation tank is measured, the auxiliary pipeline (6) is connected to the branch of the air inlet of the external high-pressure air pump, and a valve is set on the branch. Then, the three-way valve (61) is adjusted to connect the auxiliary pipeline (6) with the elastic telescopic tube (51); then, the external high-pressure air pump is controlled to work, and the external high-pressure air pump extracts the air inside the elastic telescopic tube (51) to shorten it, thereby driving the detection rod (5) to move upward. During the upward movement, the high-pressure air ejected from the purge hole (31) purges and cleans the main float (82); after the detection rod (5) moves into the inner tube (4), the branch valve is closed, and the regulating rod (71) is rotated to rotate the auxiliary float (92) to the lower side of the outer tube (3), and the high-pressure air ejected from the purge hole (31) purges and cleans the auxiliary float (92).

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