A coal flotation automatic control dosing device and automatic control dosing method thereof

Abstract

The present invention discloses an automatic control dosing device for coal flotation and an automatic control dosing method thereof, comprising a collector medicine tank and a foaming agent medicine tank, wherein the collector medicine tank and the foaming agent medicine tank are both connected to a first dosing pipe section and a second dosing pipe section through a plurality of metering valves, wherein the first dosing pipe section is serially connected to a coarse coal slime conveying pipeline, and the second dosing pipe section is serially connected to a fine coal slime conveying pipeline; the foaming agent medicine tank is also connected to a dosing nozzle through a metering valve, and a plurality of the dosing nozzles are arranged at the bottom of the flotation machine; and each metering valve is controlled by a dosing control system. The present invention improves the overall flotation efficiency by performing multiple dosing and mixing in the process of conveying coal slime, and then improves the flotation effect by spraying air with the foaming agent at the bottom of the flotation machine after mixing, and the whole process is controlled by the dosing control system to control each flow valve to ensure the proportion, and finally realizes a reliable flotation dosing process.

Description

Technical Field

[0001] The invention relates to the field of flotation dosing, in particular to an automatic control dosing device for coal flotation and an automatic control dosing method thereof. Background Art

[0002] At present, flotation coal preparation is a common method for coal preparation plants to prepare clean coal. Usually, the raw coal particles are added with water and stirred to dilute into coal slime, and then the corresponding proportion of collector and frother are added and stirred for a period of time, and finally sent to the flotation machine for aeration flotation. Usually, the dilution and stirring process and the dosing and stirring process need to be carried out separately, and in order to ensure the ratio of the reagent, a fixed amount of coal slime is added to the stirring device and then a corresponding amount of reagent is added to the stirring device. After the stirring is completed, the coal slime mixed with the reagent needs to be transported and the above dosing process needs to be repeated to reduce the ratio error, so continuous dosing cannot be achieved. In the drug-adding process, each link of mixing and conveying needs to be carried out separately, which affects the flotation efficiency. The raw coal ore particles are of different coarseness and fineness, which leads to the distribution of the reagents after mixing. The different coarseness and fineness have different requirements for the reagent ratio. The flotation effect achieved by designing the reagent ratio is not optimal. Therefore, the coarse and fine coal slimes are graded according to the particle size and then diluted into coal slimes, and the drugs are added and mixed separately, and finally sent to the flotation machine for flotation together, which can improve the flotation effect. In addition, the design of the dosing device can achieve mixing while adding drugs during the coal slime transportation process, thereby realizing a continuous dosing process to improve the dosing efficiency. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an automatic control dosing device for coal flotation and an automatic control dosing method thereof, which improves the overall flotation efficiency by performing multiple dosing and mixing in the process of conveying coal slime, and then sprays air with a frother at the bottom of the flotation machine after mixing to improve the flotation effect. The whole process is controlled by the dosing control system to control each flow valve to ensure the ratio, and finally realizes a reliable flotation dosing process.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides an automatic control dosing device for coal flotation and an automatic control dosing method thereof, comprising a collector tank, the collector tank is connected to a first dosing pipe section through a plurality of first metering valves, the first dosing pipe section is serially connected to a coarse coal slime conveying pipeline, the coarse coal slime conveying pipeline is used to connect a coarse coal slime dilution device to a flotation machine; the collector tank is connected to a second dosing pipe section through a plurality of second metering valves, the second dosing pipe section is serially connected to a fine coal slime conveying pipeline, the fine coal slime conveying pipeline is used to connect a fine coal slime dilution device to the flotation machine ; It also includes a foaming agent tank, which is connected to the first dosing pipe section through a number of third metering valves, the foaming agent tank is connected to the second dosing pipe section through a number of fourth metering valves, the foaming agent tank is connected to the dosing nozzle through a fifth metering valve, and the dosing nozzles are arranged at the bottom of the flotation machine; It also includes a dosing control system, the dosing control system feedback signal is received by the first flow valve and the second flow valve, and the dosing control system control signal is output to the first metering valve, the second metering valve, the third metering valve, the fourth metering valve and the fifth metering valve.

[0005] Furthermore, the first dosing pipe segment and the second dosing pipe segment have the same structure and both include a pipe segment body, a dosing ring cavity is coaxially arranged in the pipe wall of the pipe segment body, a plurality of the dosing ring cavities are equidistantly arranged along the axial direction of the pipe wall, a plurality of pipe segment tank interfaces for connecting the collector tank and the foaming agent tank are arranged on the outer circular surface of the dosing ring cavity, and a dosing port is opened on the inner wall surface of the pipe segment body.

[0006] Furthermore, the drug adding port is sealed by the conical tube wall at the small-diameter end of the inner movable sleeve, the inner movable sleeve is fitted to the inner wall surface of the pipe segment body and slides axially, a clamping ring is provided at the large-diameter end of the inner movable sleeve, the clamping ring is axially slid in the annular groove, and the clamping ring is elastically connected to the end face of the annular groove away from the drug adding port through an elastic ring sheet.

[0007] Furthermore, a plurality of flow limiting rings are arranged axially at the discharge end of the pipe segment body, and the central flow limiting hole of the flow limiting ring includes flow conical surfaces and direct current grooves alternately arranged along the circumferential direction, and the flow conical surfaces and direct current grooves on adjacent flow limiting rings are arranged correspondingly.

[0008] Furthermore, the dosing nozzle includes an outer tube and an inner tube coaxially sleeved therewith, a spraying channel is formed between the outer tube and the inner tube, a plurality of nozzle medicine tank interfaces are arranged at one end of the spraying channel, a valve stem is axially arranged in the inner tube, a jet channel is formed between the inner tube and the valve stem, an air path interface is arranged at one end of the jet channel, an air inlet valve block is arranged at one end of the valve stem close to the air path interface, the air inlet valve block is tightly arranged relative to the air path interface through an elastic member, the air inlet valve block is elastically connected relative to an inner end surface of a guide sleeve through an elastic member, the guide sleeve is coaxially fixed relative to an inner wall of the inner tube, the valve stem is slidably arranged relative to a guide hole of an inner end surface of the guide sleeve, a nozzle valve block is arranged at one end of the valve stem close to the spraying channel and the jet outlet of the jet channel, a conical nozzle is formed between the conical guide surface of the nozzle valve block and the jet outlet of the spraying channel and the jet outlet.

[0009] Furthermore, first, the dosing control system sends corresponding control signals to multiple metering valves connected to the first dosing pipe section according to the crude coal sludge flow detection feedback signals obtained from the first flow valve, so as to adjust the corresponding reagent flow in the dosing pipeline corresponding to each metering valve, and then the corresponding reagents added by multiple dosing pipelines are delivered in sections to the crude coal sludge flow flowing through the first dosing pipe section through the first dosing pipe section.

[0010] Furthermore, firstly, the dosing control system sends corresponding control signals to multiple metering valves connected to the second dosing pipe section according to the fine coal sludge flow detection feedback signals obtained from the second flow valve respectively, so as to adjust the corresponding reagent flow in the dosing pipeline corresponding to each metering valve, and then the corresponding reagents added by multiple dosing pipelines are delivered in sections into the fine coal sludge flow flowing through the second dosing pipe section through the second dosing pipe section.

[0011] Furthermore, first, the coal sludge flow flows through the inner cavity of the pipe segment body from the feed end to the discharge end, and the reagent flow is connected to the dosing ring cavity through the pipe segment medicine tank interface, and then through continuous dosing for a period of time, the reagent flow at the dosing port exerts pressure on the conical pipe wall, thereby pushing the inner movable sleeve to move so that the dosing port is opened to realize the dosing process, and then the dosing is stopped by controlling the closing of the corresponding metering valve so that the inner movable sleeve moves to reset and close the dosing port. After stopping the dosing for a period of time, the above dosing process is repeated, so as to realize continuous interval dosing in this way, and multiple inner movable sleeves act synchronously, and the interval time remains consistent.

[0012] Furthermore, the frothing agent at the bottom of the flotation machine automatically controls the dosing process: first, the dosing control system sends a corresponding control signal to the fifth metering valve according to the coarse coal slime flow detection feedback signal obtained from the first flow valve and the fine coal slime flow detection feedback signal obtained from the second flow valve to adjust the flow of the frothing agent in the bottom dosing pipeline; then, the frothing agent added from the bottom dosing pipeline is evenly distributed together with air from the bottom of the flotation machine to the mixed coal slime in the flotation machine through multiple dosing nozzles.

[0013] Beneficial effects: The automatic control dosing device and automatic control dosing method for coal flotation of the present invention have at least the following advantages:

[0014] (1) By adding reagents to coarse coal slime and fine coal slime respectively, and calculating and controlling the corresponding amount of reagents added according to real-time monitoring of the coal slime flow, the ratio of reagents to coal slime is ensured, and a flotation effect closer to the optimal expectation is achieved.

[0015] (2) By designing the dosing pipe section, the dosing of coal slime can be completed during the transportation process of coal slime, solving the problem of land occupation of large dosing and mixing equipment, and effectively improving the efficiency of flotation; through the specific structure of the dosing pipe section, it is possible to achieve multiple batch dosing with a mixing effect, realizing an efficient dosing and mixing process within a short distance, further improving efficiency.

[0016] (3) By designing a dosing nozzle, a small amount of frother is sprayed on the bottom of the flotation machine to connect the air, so that the air is easier to disperse into bubbles and diffuse evenly, so as to work together with the collector and frother mixed in the coal slime to improve the flotation effect; the specific structure of the dosing nozzle can prevent the coal slime from flowing back and causing blockage, and it has an emergency shut-off function, which automatically shuts down in the event of air or liquid failure, ensuring that the relative proportion of each component is within the error range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is the structural diagram of the automatic control dosing device for coal flotation and the corresponding dosing control method diagram;

[0018] Attached Figure 2 It is a structural cross-section diagram of the dosing joint and a schematic diagram of the flow and mixing of coal slime and reagents;

[0019] Attached Figure 3 It is a perspective schematic diagram of a structure in which multiple current limiting rings are superimposed;

[0020] Attached Figure 4 This is a structural cross-sectional view of the dosing nozzle. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] As attached Figure 1-4The automatic control dosing device for coal flotation and the automatic control dosing method thereof include a collector medicine tank 1, the collector medicine tank 1 is connected to a first dosing pipe section 3 through a plurality of first metering valves 2, the first dosing pipe section 3 is connected in series to a coarse coal slime conveying pipeline 4, the coarse coal slime conveying pipeline 4 is used to connect a coarse coal slime dilution device 5 to a flotation machine 6; the collector medicine tank 1 is connected to a second dosing pipe section 8 through a plurality of second metering valves 7, the second dosing pipe section 8 is connected in series to a fine coal slime conveying pipeline 9, the fine coal slime conveying pipeline 9 is used to connect a fine coal slime dilution device 10 to the flotation machine 6; and also includes a foaming agent tank 11, the foaming agent The tank 11 is connected to the first dosing pipe section 3 through a plurality of third metering valves 12, the foaming agent tank 11 is connected to the second dosing pipe section 8 through a plurality of fourth metering valves 13, the foaming agent tank 11 is connected to the dosing nozzle 15 through a fifth metering valve 14, and the plurality of dosing nozzles 15 are arranged at the bottom of the flotation machine 6; it also includes a dosing control system 16, the feedback signal of the dosing control system 16 is received from the first flow valve 17 and the second flow valve 18, and the control signal of the dosing control system 16 is output to the first metering valve 2, the second metering valve 7, the third metering valve 12, the fourth metering valve 13 and the fifth metering valve 14.

[0023] The process of automatic control of coarse coal slime reagent dosing is as follows: first, the dosing control system 16 sends corresponding control signals to multiple metering valves connected to the first dosing pipe section 3 according to the coarse coal slime flow detection feedback signals obtained from the first flow valve 17, so as to adjust the corresponding reagent flow in the corresponding dosing pipeline of each metering valve, and then the corresponding reagent added by the multiple dosing pipelines is sent into the coarse coal slime flow flowing through the first dosing pipe section 3 in sections through the first dosing pipe section 3;

[0024] The specific steps of the automatic control dosing process of coarse coal slime collector are as follows:

[0025] Step A1, the dosing control system 16 sends corresponding control signals to the plurality of first metering valves 2 according to the coarse coal slime flow detection feedback signal obtained from the first flow valve 17, so as to adjust the collector flow in the corresponding dosing pipeline;

[0026] Step A2, the collector added by multiple dosing pipelines is fed into the coarse coal slime flow flowing through the first dosing pipe section 3 in sections through the first dosing pipe section 3.

[0027] The specific steps of the automatic control dosing process of coarse coal slime foaming agent are as follows:

[0028] Step B1, the dosing control system 16 sends corresponding control signals to the plurality of third metering valves 12 according to the coarse coal slime flow detection feedback signal obtained from the first flow valve 17, so as to adjust the foaming agent flow in the corresponding dosing pipeline;

[0029] Step B2, feeding the foaming agent added by the multiple dosing pipelines into the coarse coal slime flow flowing through the first dosing pipe section 3 in sections through the first dosing pipe section 3.

[0030] Fine coal slime reagent automatic control dosing process: first, the dosing control system 16 sends corresponding control signals to multiple metering valves connected to the second dosing pipe section 8 according to the fine coal slime flow detection feedback signals obtained from the second flow valve 18, respectively, to adjust the corresponding reagent flow in the corresponding dosing pipeline of each metering valve, and then the corresponding reagent added by the multiple dosing pipelines is sent to the fine coal slime flow flowing through the second dosing pipe section 8 in sections through the second dosing pipe section 8;

[0031] The specific steps of the automatic control dosing process of fine coal slime collector are as follows:

[0032] Step C1, the dosing control system 16 sends corresponding control signals to the plurality of second metering valves 7 according to the fine coal slime flow detection feedback signal obtained from the second flow valve 18, so as to adjust the collector flow in the corresponding dosing pipeline;

[0033] Step C2, the collector added by the multiple dosing pipelines is fed into the fine coal slime flow flowing through the second dosing pipe segment 8 in sections.

[0034] The specific steps of the automatic control dosing process of fine coal slime foaming agent are as follows:

[0035] Step D1, the dosing control system 16 sends corresponding control signals to the plurality of fourth metering valves 13 according to the fine coal slime flow detection feedback signal obtained from the second flow valve 18, so as to adjust the foaming agent flow in the corresponding dosing pipeline;

[0036] Step D2, the foaming agent added by the multiple dosing pipelines is fed into the fine coal sludge flow flowing through the second dosing pipe section 8 in sections.

[0037] The first dosing pipe segment 3 and the second dosing pipe segment 8 have the same structure, both of which include a pipe segment body 19, a dosing ring cavity 20 is coaxially arranged in the pipe wall of the pipe segment body 19, and a plurality of the dosing ring cavities 20 are arranged equidistantly along the axial direction of the pipe wall, and a plurality of pipe segment medicine tank interfaces 21 for connecting the collector medicine tank 1 and the foaming agent medicine tank 11 are arranged on the outer circumferential surface of the dosing ring cavity 20, and a dosing port is opened on the inner wall surface of the pipe segment body 19;

[0038] The drug adding port is tightly closed by the conical tube wall 22-1 at the small-diameter end of the inner movable sleeve 22, and the inner movable sleeve 22 is axially slidably arranged on the inner wall surface of the pipe segment body 19. A clamping ring 22-2 is axially slidably arranged in the annular groove 23 at the large-diameter end of the inner movable sleeve 22, and the clamping ring 22-2 is elastically connected to the end surface of the annular groove 23 away from the drug adding port through an elastic ring sheet 22-3;

[0039] A plurality of flow limiting rings 24 are arranged axially at the discharge end of the pipe segment body 19. The central flow limiting hole of the flow limiting ring 24 includes flow conical surfaces 24-1 and direct current grooves 24-2 alternately arranged along the circumferential direction. The flow conical surfaces 24-1 and direct current grooves 24-2 on adjacent flow limiting rings 24 are arranged correspondingly.

[0040] Dosing pipe segment dosing method:

[0041] First, the coal sludge flows from the feed end to the discharge end through the inner cavity of the pipe segment body 19, and the reagent flow is connected to the dosing ring cavity 20 through the pipe segment medicine tank interface 21. Then, through continuous dosing for a period of time, the reagent flow at the dosing port exerts pressure on the conical pipe wall 22-1, thereby pushing the inner movable sleeve 22 to move so that the dosing port is opened to realize the dosing process. Then, by controlling the closing of the corresponding metering valve, the inner movable sleeve 22 moves and resets to close the dosing port to stop dosing. After stopping dosing for a period of time, the above dosing process is repeated, so as to realize continuous interval dosing in this way. The interval time is set according to the time length of the coal sludge flowing through a single inner movable sleeve in a unit volume. Multiple inner movable sleeves 22 act synchronously and the interval time length is kept consistent.

[0042] When multiple inner movable sleeves act synchronously, due to the movement of the inner movable sleeves, while opening the corresponding dosing port, the inner wall of the conical tube wall drives the coal sludge close to the inner wall of the inner movable sleeve to flow into the corresponding inner cavity of the elastic ring piece during the movement. At the same time, the coal sludge flow sprayed from the small-diameter end port of the previous inner movable sleeve and the medicine sprayed from the previous dosing ring cavity also flow into the corresponding inner cavity of the elastic ring piece of the inner movable sleeve. The three convection currents collide and mix in this area to achieve a section of dosing mixing. After the corresponding metering valve is closed by the dosing control system, the pressure applied by the medicine flow on the conical tube wall is weakened. Under the push of the elastic ring piece resetting and the coal sludge flow, the inner movable sleeve moves and resets, and the dosing port is re-blocked, thereby temporarily terminating the dosing. In this process, the elastic ring piece resets the coal sludge mixed with the medicine on the periphery to flow to the center The coal slime flow is squeezed and mixed into the central coal slime flow, and is pushed forward with the central coal slime flow. When the next drug addition is performed, this part of the mixed coal slime will be sprayed into the next inner movable sleeve from the small-diameter end port under the movement of the inner movable sleeve to repeat the above-mentioned drug addition and mixing process, thereby realizing that the reagent to be added to the coal slime flow in a unit volume is divided into multiple portions, which are added in batches during the transportation process of the coal slime flow, and are mixed each time they are added. At the end of the pipe section, the coal slime that has been drugged multiple times passes through multiple flow-limiting rings. The converging cone surface can make the peripheral coal flow of the corresponding area converge to the middle, completely pass through and diffuse to the periphery with the mixed coal flow in the middle, and the direct current groove makes the peripheral coal flow of the corresponding area pass directly. The multiple limiting rings are staggered and superimposed, which can make the peripheral coal flow alternately converge, mix and diffuse inward, thereby ensuring the full mixing of the reagent and the coal slime.

[0043] The flow rate of the coal slime before it enters the dosing pipe section is detected by the flow valve, the dosing control system automatically calculates the dosage of each dosing, and the corresponding metering valve flow is controlled to achieve the control of the dosage of each dosing, so that after the coal slime passes through the dosing pipe section, the expected proportion of coal slime and reagent can be mixed, wherein this stage of mixing includes the expected mixing of all collectors with coal slime, and the expected mixing of part of the frother with coal slime, and the remaining part of the frother is added together with air at the bottom of the flotation machine for dosing.

[0044] The specific steps of the automatic control dosing process of the foaming agent at the bottom of the flotation machine are as follows:

[0045] Step E1, the dosing control system 16 sends a corresponding control signal to the fifth metering valve 14 according to the coarse coal slime flow detection feedback signal obtained from the first flow valve 17 and the fine coal slime flow detection feedback signal obtained from the second flow valve 18, so as to adjust the flow rate of the foaming agent in the bottom dosing pipeline;

[0046] Step E2, the frother added from the bottom dosing pipeline is uniformly delivered to the mixed coal slime in the flotation machine 6 from the bottom of the flotation machine 6 together with the air through a plurality of dosing nozzles 15.

[0047] The dosing nozzle 15 includes an outer tube 15-1 and an inner tube 15-2 coaxially sleeved therewith, a spraying passage 25 is formed between the outer tube 15-1 and the inner tube 15-2, one end of the spraying passage 25 is provided with a plurality of nozzle medicine tank interfaces 25-1, a valve stem 15-3 is axially arranged in the inner tube 15-2, an injection passage 26 is formed between the inner tube 15-2 and the valve stem 15-3, one end of the injection passage 26 is provided with an air path interface 26-1, an air port valve block 27 is provided at one end of the valve stem 15-3 near the air path interface 26-1, and the air port valve block 27 is elastically The elastic member 28 is tightly arranged relative to the gas path interface 26-1, the gas port valve block 27 is elastically connected to the inner end surface of the guide sleeve 15-4 through the elastic member 28, the guide sleeve 15-4 is coaxially fixed relative to the inner wall of the inner tube 15-2, the valve stem 15-3 is slidably arranged relative to the guide hole of the inner end surface of the guide sleeve 15-4, and a nozzle valve block 29 is arranged at one end of the valve stem 15-3 close to the spray outlet of the spray channel 25 and the jet channel 26, and a conical nozzle 30 is formed between the conical guide surface of the nozzle valve block 29 and the spray outlet of the spray channel 25 and the jet channel 26.

[0048] Dosing nozzle spraying method:

[0049] The foaming agent is connected to the spraying channel through the nozzle medicine tank interface. After flowing through the entire spraying channel, it applies pressure to the conical guide surface of the nozzle valve block at the spray outlet position. At the same time, air is connected through the air path interface to apply pressure to the air outlet valve block. The combined effect of the two pressures on the valve stem pushes the valve stem to move, so that the conical nozzle opens, and the air is immediately connected to the jet channel. Finally, the foaming agent is sprayed out together with the conical nozzle, forming a conical agent surface at the bottom of the flotation machine. At the same time, it is conducive to the rapid effect of the foaming agent and accelerates the generation of bubbles. The bubbles carry the agent up and contact with the agent mixed in the coal slime, generating more bubbles, thereby carrying the clean coal to float, achieving a better flotation effect, and the pressing force provided by the elastic member needs to be offset by the combined pressure provided by the foaming agent and the air to push the valve stem. The conical nozzle is opened. When either the agent or the air is insufficiently supplied, the valve stem will be reset under the action of the elastic member to ensure the ratio of the agent to the air. In addition, the position where the agent applies pressure is at the nozzle valve block, and the position where the air applies pressure is at the air port valve block, and the medicine spraying channel surrounds the outside of the jet channel, that is, the valve port position of the jet channel is lower than the valve port of the medicine spraying channel. When the medicine is cut off, during the process of resetting the valve stem, air is continuously supplied until the conical nozzle is closed, and a conical air barrier is maintained around the nozzle to prevent the backflow of coal slime from causing blockage of the nozzle. When the gas is cut off, a medicine barrier will be formed in the same way to prevent the backflow of coal slime. At the same time, the air port valve block cuts off the connection between the gas path interface and the ventilation channel. Air remains in the ventilation channel to prevent the agent from flowing back into the gas path and polluting the air pipe.

[0050] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the above principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An automatic control dosing device for coal flotation, characterized in that: The invention comprises a collector medicine tank (1), wherein the collector medicine tank (1) is connected to a first medicine dosing pipe section (3) through a plurality of first metering valves (2), wherein the first medicine dosing pipe section (3) is connected in series to a coarse coal slime conveying pipeline (4), wherein the coarse coal slime conveying pipeline (4) is used to connect a coarse coal slime dilution device (5) to a flotation machine (6); the collector medicine tank (1) is connected to a second medicine dosing pipe section (8) through a plurality of second metering valves (7), wherein the second medicine dosing pipe section (8) is connected in series to a fine coal slime conveying pipeline (9), wherein the fine coal slime conveying pipeline (9) is used to connect a fine coal slime dilution device (10) to the flotation machine (6); and further comprises a foaming agent medicine tank (11), wherein the foaming agent medicine tank (11) is connected to a first medicine dosing pipe section (3) through a plurality of third metering valves (12). ) is connected to the first dosing pipe section (3), the foaming agent tank (11) is connected to the second dosing pipe section (8) through a plurality of fourth metering valves (13), the foaming agent tank (11) is connected to the dosing nozzle (15) through a fifth metering valve (14), and the plurality of dosing nozzles (15) are arranged at the bottom of the flotation machine (6); it also includes a dosing control system (16), the feedback signal of the dosing control system (16) is received from the first flow valve (17) and the second flow valve (18), and the control signal of the dosing control system (16) is output to the first metering valve (2), the second metering valve (7), the third metering valve (12), the fourth metering valve (13) and the fifth metering valve (14).

2. The automatic control dosing device for coal flotation according to claim 1 is characterized by: The first dosing pipe segment (3) and the second dosing pipe segment (8) have the same structure and both include a pipe segment body (19). A dosing ring cavity (20) is coaxially arranged in the pipe wall of the pipe segment body (19). A plurality of the dosing ring cavities (20) are arranged equidistantly along the axial direction of the pipe wall. A plurality of pipe segment tank interfaces (21) for connecting the collector tank (1) and the foaming agent tank (11) are arranged on the outer circumferential surface of the dosing ring cavity (20). The dosing ring cavity (20) is provided with a dosing port on the inner wall surface of the pipe segment body (19).

3. The automatic control dosing device for coal flotation according to claim 2 is characterized by: The drug adding port is sealed by the conical tube wall (22-1) at the small-diameter end of the inner movable sleeve (22); the inner movable sleeve (22) is fitted to the inner wall surface of the pipe segment body (19) and is axially slidable; a clamping ring (22-2) is provided at the large-diameter end of the inner movable sleeve (22); the clamping ring (22-2) is axially slidable in the annular groove (23); the clamping ring (22-2) is elastically connected to the end face of the annular groove (23) away from the drug adding port through an elastic ring sheet (22-3).

4. The automatic control dosing device for coal flotation according to claim 3 is characterized by: A plurality of flow limiting rings (24) are arranged axially at the discharge end of the pipe segment body (19); the central flow limiting hole of the flow limiting ring (24) comprises flow conical surfaces (24-1) and direct current grooves (24-2) alternately arranged along the annular direction; the flow conical surfaces (24-1) and direct current grooves (24-2) on adjacent flow limiting rings (24) are arranged correspondingly.

5. The automatic control dosing device for coal flotation according to claim 1 is characterized by: The dosing nozzle (15) comprises an outer tube (15-1) and an inner tube (15-2) coaxially sleeved therewith, a spraying passage (25) is formed between the outer tube (15-1) and the inner tube (15-2), one end of the spraying passage (25) is provided with a plurality of nozzle medicine tank interfaces (25-1), a valve stem (15-3) is axially arranged in the inner tube (15-2), an injection passage (26) is formed between the inner tube (15-2) and the valve stem (15-3), one end of the injection passage (26) is provided with an air path interface (26-1), an air port valve block (27) is provided at one end of the valve stem (15-3) close to the air path interface (26-1), and the air port valve block (27) is connected to the nozzle through a valve stem (15-3) and a ... The elastic member (28) is tightly arranged relative to the gas path interface (26-1), the gas port valve block (27) is elastically connected to the inner end surface of the guide sleeve (15-4) through the elastic member (28), the guide sleeve (15-4) is coaxially fixed relative to the inner wall of the inner tube (15-2), the valve stem (15-3) is slidably arranged relative to the guide hole of the inner end surface of the guide sleeve (15-4), and a nozzle valve block (29) is arranged at one end of the valve stem (15-3) close to the spraying outlet of the spraying channel (25) and the jet channel (26), and a cone nozzle (30) is formed between the conical guide surface of the nozzle valve block (29) and the spraying outlet of the spraying channel (25) and the jet channel (26).

6. The automatic control dosing method of the coal flotation automatic control dosing device according to any one of claims 1 to 5, characterized in that: First, a dosing control system (16) sends corresponding control signals to a plurality of metering valves connected to a first dosing pipe section (3) according to flow detection feedback signals of the coarse coal sludge flow obtained from the first flow valve (17) to adjust the flow rates of corresponding reagents in the dosing pipelines corresponding to the metering valves, and then the corresponding reagents added from the plurality of dosing pipelines are delivered in sections to the coarse coal sludge flow flowing through the first dosing pipe section (3) through the first dosing pipe section (3).

7. The automatic control dosing method of the automatic control dosing device for coal flotation according to claim 6 is characterized by: First, the dosing control system (16) sends corresponding control signals to a plurality of metering valves connected to the second dosing pipe section (8) according to the fine coal slime flow detection feedback signals obtained from the second flow valve (18) to adjust the corresponding reagent flow in the corresponding dosing pipeline of each metering valve, and then the corresponding reagent added by the plurality of dosing pipelines is sent in sections to the fine coal slime flow flowing through the second dosing pipe section (8) through the second dosing pipe section (8).

8. The automatic control dosing method of the automatic control dosing device for coal flotation according to claim 7 is characterized by: First, the coal sludge flow passes through the inner cavity of the pipe segment body (19) from the feed end to the discharge end, and the medicine flow is connected to the medicine dosing ring cavity (20) through the pipe segment medicine tank interface (21). Then, by continuously adding medicine for a period of time, the medicine flow at the medicine dosing port exerts pressure on the conical pipe wall (22-1), thereby pushing the inner movable sleeve (22) to move so that the medicine dosing port is opened to realize the medicine dosing process. Then, by controlling the closing of the corresponding metering valve, the inner movable sleeve (22) moves to reset and close the medicine dosing port to realize the stopping of medicine dosing. After stopping medicine dosing for a period of time, the above-mentioned medicine dosing process is repeated, thereby realizing continuous interval medicine dosing. Multiple inner movable sleeves (22) act synchronously, and the interval time is kept consistent.

9. The automatic control dosing method of the automatic control dosing device for coal flotation according to claim 8 is characterized by: The automatic control dosing process of the foaming agent at the bottom of the flotation machine is as follows: first, the dosing control system (16) sends a corresponding control signal to the fifth metering valve (14) according to the coarse coal slime flow detection feedback signal obtained from the first flow valve (17) and the fine coal slime flow detection feedback signal obtained from the second flow valve (18), so as to adjust the foaming agent flow in the bottom dosing pipeline; Then, the foaming agent added from the bottom dosing pipeline is uniformly delivered to the mixed coal slime in the flotation machine (6) from the bottom of the flotation machine (6) together with air through a plurality of dosing nozzles (15).

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