A slag removal device and method for air flotation process

Abstract

This invention belongs to the field of wastewater treatment technology and discloses a flotation process sludge removal device and method, including: a flotation tank for water treatment; a sludge removal structure including an outer tank, an inner tank, an inlet inclined plate, a magnetic suction plate, and an electric sludge removal valve. The outer tank is connected to the flotation tank, the inner tank is connected to the outer tank, the inlet inclined plate is connected above the inner tank, the magnetic suction plate is connected to the inlet inclined plate for opening and closing the device, and the electric sludge removal valve is connected below the inner tank. The inner tank is fixed inside the outer tank by the magnetic suction plate. The inner tank rises and falls inside the outer tank by buoyancy, allowing sludge to enter the inner tank and be discharged through the electric sludge removal valve. The beneficial effects of this invention are that by utilizing the depth of the flotation tank and the buoyancy of the water, the flotation sludge can be discharged outside the tank without external power, and the flotation process can be completed without interrupting production or raising the water level, ensuring continuous operation of the flotation process.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a slag discharge device and method for an air flotation process. Background Technology

[0002] Currently, common sludge removal technologies can be divided into three categories: overflow sludge, which relies on the rise of water level or the rise of sludge surface after sludge accumulation to overflow sludge. However, the concentration of overflow sludge is low, the water loss is large, and the sludge removal effect is not good for highly viscous sludge. Skimming sludge is only used for sludge removal in shallow ponds and has a high manufacturing cost. Scraping sludge is the most commonly used sludge removal method in air flotation equipment, but it also has obvious defects. Regardless of the movement of the scraper, there is a risk that the sludge may be squeezed against each other during the scraping process, causing sludge to fall and affecting water quality. Due to factors such as the excessive speed of the scraper or the depth of the scraper insertion into the sludge layer, the sludge is broken and turbulent, and some sludge is squeezed off and falls into the water. During its descent, it happens to merge with the effluent from the air flotation, and the sludge is carried out by the water, affecting the treatment effect of air flotation.

[0003] Regardless of whether the slag is overflowed or scraped, the liquid level needs to be raised above the slag discharge port before slag discharge. During normal operation, the effluent from the flotation tank needs to be closed to raise the water level and complete the slag discharge. Since the liquid level before slag discharge is higher than during normal operation, the instantaneous impact of opening the effluent from the flotation tank to enter the filter after the discharge is completed is too large, which disturbs the filter and affects the quality of the effluent from the filter. On the other hand, skimming requires highly skilled personnel and equipment. Careless operation can easily cause the slag to break and sink back into the water, affecting the quality of the effluent from the air flotation process. Summary of the Invention

[0004] This invention addresses the problem in existing technologies where, due to the higher liquid level before sludge discharge compared to normal operation, the excessive instantaneous impact when the effluent from the flotation tank enters the filter after inspection causes disturbance to the filter, affecting the effluent quality. Furthermore, sludge skimming requires highly skilled personnel and equipment; improper operation can easily damage the sludge, causing it to re-sink and impacting the effluent quality of the air flotation process. The invention proposes the following technical solution:

[0005] A slag discharge device for an air flotation process, comprising:

[0006] A sedimentation tank is used for water treatment.

[0007] The slag discharge structure includes an outer tank, an inner tank, an inlet inclined plate, a magnetic suction plate, and an electric slag discharge valve. The outer tank is connected to the flotation tank, the inner tank is connected to the outer tank, the inlet inclined plate is connected above the inner tank, the magnetic suction plate is connected to the inlet inclined plate and is used for opening and closing the equipment, and the electric slag discharge valve is connected below the inner tank. The inner tank is fixed inside the outer tank by the magnetic suction plate. The inner tank rises and falls inside the outer tank by buoyancy, so that the slag enters the inner tank and is discharged through the electric slag discharge valve.

[0008] As a preferred embodiment of the above technical solution, the slag discharge structure further includes:

[0009] A rectangular slag inlet is connected to the outer tank, a slag discharge hole is connected to the inner tank, and a telescopic pipe is connected to the electric slag discharge valve. The rectangular slag inlet, slag discharge hole, and telescopic pipe work together to guide the slag flow.

[0010] As a preferred embodiment of the above technical solution, a flow diversion structure is installed inside the inlet inclined plate, the flow diversion structure including:

[0011] The diversion frame is connected inside the inlet inclined plate;

[0012] A sieve plate is connected to the top of the diversion frame and is fixed by the diversion frame. An adjustment structure is also provided inside the diversion structure.

[0013] As a preferred embodiment of the above technical solution, the adjustment structure includes:

[0014] A rotating plate is connected inside the diversion frame, and a rubber strip is connected to the outside of the rotating plate. The rotating plate causes the rubber strip to fit against the inner wall of the diversion frame.

[0015] As a preferred embodiment of the above technical solution, a driving structure is installed inside the inlet inclined plate, the driving structure comprising:

[0016] A vertical pole is connected to the diversion frame, a rubber wheel is connected to the vertical pole, a belt connection structure is connected to the rubber wheel, and a positioning shaft is connected to the belt connection structure. Through the belt connection structure, the positioning shaft and the vertical pole rotate synchronously.

[0017] As a preferred embodiment of the above technical solution, the driving structure further includes: a driving plate connected to the positioning shaft, which enables the driving plate and the upright to rotate synchronously.

[0018] As a preferred embodiment of the above technical solution, an exhaust structure is installed inside the diversion frame. The exhaust structure includes an exhaust pipe connected to the diversion frame for guiding the flow of gas or liquid.

[0019] As a preferred embodiment of the above technical solution, the electric slag discharge valve and the telescopic pipe adopt a quick-release connection structure.

[0020] The present invention also provides a method for using a slag discharge device in an air flotation process, comprising the following steps:

[0021] Step 1: When slag discharge is required, the automatic control system will give a slag discharge signal, the magnetic electromagnetic switch will be de-energized, and the inner tank will descend to the predetermined position where the lower end of the rectangular slag inlet is submerged 50mm below the water surface under the suction force of the magnetic attraction.

[0022] Step 2: When the lower end of the rectangular slag inlet is submerged at the predetermined position 50mm below the water surface, the slag on the water surface enters the inner tank from the rectangular slag inlet of the outer tank and slides into the side wall of the inlet inclined plate.

[0023] Step 3: When the scum on the water surface slides into the inner tank, it sinks due to gravity as the scum and water increase inside the inner tank.

[0024] Step 4: When the inner tank sinks 100mm, the electric slag discharge valve opens, and the opening degree of the electric slag discharge valve increases from 0% to 30%. When the inner tank continues to sink 200mm, the opening degree of the electric slag discharge valve increases from 30% to 50%. When the inner tank sinks 300mm, the opening degree of the electric slag discharge valve increases from 50% to 100%.

[0025] Step 5: When the amount of scum and water in the inner tank is less than the buoyancy of the flotation tank 1 on the inner tank, the inner tank begins to float.

[0026] Step Six: After the inner tank stops for 30 seconds at a distance of 50mm from the water surface at the lower end of the rectangular slag inlet, the electric slag discharge valve is closed by a signal command, and the opening of the electric slag discharge valve in the inner tank is closed from 100% to 0%.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) By utilizing the depth of the flotation tank and the buoyancy of the water, the scum of the air flotation can be discharged out of the tank without external power. It can also achieve continuous operation of the air flotation process without stopping production or raising the water level to discharge scum.

[0029] (2) It can guide the scum accumulated on one side of the inner wall of the outer tank, prevent the scum from remaining at the connection and closure of the outer and inner tanks, thereby reducing the impact of the scum on the rise and fall of the inner tank. At the same time, it can clean the top edge of the inner tank, ensuring that the scum moves along the top of the inner tank. Attached Figure Description

[0030] Figure 1 A cross-sectional view showing the location of the slag removal device in the flotation tank is shown;

[0031] Figure 2 A schematic diagram of the slag discharge device is shown;

[0032] Figure 3 It shows Figure 1 Schematic diagram of the structure of region A in the middle;

[0033] Figure 4 A schematic diagram of the slag discharge device during slag discharge is shown;

[0034] Figure 5 A schematic diagram is shown when the slag discharge device is operating at its lowest position;

[0035] Figure 6 A schematic diagram of the flow splitting structure is shown;

[0036] Figure 7 A cross-sectional view of the flow splitting structure is shown;

[0037] Figure 8 It shows Figure 7 Schematic diagram of the structure of region A in the middle;

[0038] Figure 9 It shows Figure 7 A schematic diagram of the structure of region B in the middle.

[0039] In the diagram: 1. Floating and settling tank; 101. Outer tank; 102. Rectangular slag inlet; 201. Inner tank; 202. Slag discharge hole; 203. Inlet inclined plate; 204. Magnetic suction plate; 205. Electric slag discharge valve; 206. Telescopic pipe; 3. Water level; 41. Diversion frame; 42. Screen plate; 43. Rotating shaft; 44. Upright pole; 45. Rotating plate; 46. Rubber strip; 47. Rubber wheel; 49. Belt connection structure; 410. Exhaust pipe; 411. Main pipe; 412. Branch pipe; 413. Positioning shaft; 414. Drive plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0041] Example 1: This invention provides a slag discharge device for an air flotation process, such as... Figures 1 to 9 As shown, it includes: a sedimentation tank 1, used for water treatment;

[0042] The slag discharge structure includes an outer tank 101, an inner tank 201, an inlet inclined plate 203, a magnetic suction plate 204, and an electric slag discharge valve 205. The outer tank 101 is connected to the flotation tank 1, the inner tank 201 is connected to the outer tank 101, the inlet inclined plate 203 is connected above the inner tank 201, the magnetic suction plate 204 is connected to the inlet inclined plate 203 and is used to drive the inner tank 201 to rise and fall, and the electric slag discharge valve 205 is connected below the inner tank 201. The inner tank 201 is fixed inside the outer tank 101 by the magnetic suction plate 204. The inner tank 201 rises and falls inside the outer tank 101 by buoyancy, so that the slag enters the inner tank 201 and is discharged through the electric slag discharge valve 205.

[0043] By utilizing the depth of the flotation tank 1 and the buoyancy of the water, the scum from the air flotation can be discharged outside the tank without external power. It also enables the air flotation process to continue without interrupting production or raising the water level, ensuring the continuous operation of the air flotation process.

[0044] During operation, the automatic control system sends a slag discharge signal, de-energizing the magnetic electromagnetic switch. At this time, the magnetic suction plate 204 is de-energized, preventing it from adhering to the inner tank 201. Without magnetic attraction, the inner tank 201 descends to a predetermined position where the lower end of the rectangular slag inlet 102 is submerged 10mm below the water surface. When the lower end of the rectangular slag inlet 102 is submerged 50mm below the water surface, surface scum enters the inner tank 201 from the rectangular slag inlet 102 of the outer tank 101 and slides into the inner tank 201 through the side wall of the inlet inclined plate 203. As the surface scum slides into the inner tank 201, it sinks due to gravity as the scum and water increase. When the inner tank 201 sinks 100mm, the level gauge sends a feedback signal to the automatic control system. The automatic control system receives this signal. After receiving the signal, a signal command is issued to open the electric slag discharge valve 205 of the inner tank 201. The opening degree of the electric slag discharge valve 205 at the bottom of the inner tank 201 increases from 0% to 30%. When the inner tank 201 continues to sink 200mm, the level gauge feeds back a signal to the automatic control system. After receiving the signal, the automatic control system issues a signal command to continue opening the electric slag discharge valve 205 of the inner tank 201. The opening degree of the electric slag discharge valve 205 at the bottom of the inner tank 201 increases from 30% to 50%. When the inner tank 201 sinks 300mm, the level gauge feeds back a signal to the automatic control system. After receiving the signal, the automatic control system issues a signal command to continue opening the electric slag discharge valve 205 of the inner tank 201. The opening degree of the electric slag discharge valve 205 at the bottom of the inner tank 201 increases from 50% to 100%. At this time, automatic slag discharge is formed.

[0045] Specifically, the outer trough 101 is fixedly installed inside the flotation tank 1. The inner trough 201 is vertically slidably connected inside the outer trough 101. The top two sides of the inner trough 201 are symmetrically welded with inlet inclined plates 203. One end face of the inlet inclined plate 203 is in contact with the inner wall of the outer trough 101. The magnetic suction plate 204 is screwed to the top of the inner wall of the flotation tank 1. The discharge port of the inner trough 201 is equipped with an electric slag discharge valve 205 by screws. The number of electric slag discharge valves 205 is set to five.

[0046] like Figure 2 and Figure 7 As shown, the inlet inclined plate 203 has a flow-dividing structure installed inside. The flow-dividing structure includes a flow-dividing frame 41 and a sieve plate 42. The flow-dividing frame 41 is connected inside the inlet inclined plate 203, and the sieve plate 42 is connected to the top of the flow-dividing frame 41. The flow-dividing frame 41 is used to fix the sieve plate 42. The flow-dividing frame 41 has an exhaust structure installed inside. The exhaust structure includes an exhaust pipe 410. The exhaust pipe 410 is connected to the flow-dividing frame 41 and is used to guide the flowing gas or liquid.

[0047] During the above process, since the top of the inlet inclined plate 203 is at an incline, some of the scum in the water accumulates on the surface of the inlet inclined plate 203, which affects the subsequent cleaning of the scum. At this time, an exhaust structure is set on the surface of the inlet inclined plate 203. Through the flow of gas, the liquid or gas flows along the surface of the inlet inclined plate 203. Under the action of increased thrust, the scum on the surface of the inlet inclined plate 203 falls off the surface of the inlet inclined plate 203, preventing the problem of scum remaining on the surface of the inlet inclined plate 203.

[0048] In use, since the diversion frame 41 is installed inside the inlet inclined plate 203, the scum and water away from the bottom of the rectangular scum inlet 102 enter the top of the inlet inclined plate 203 along the diversion frame 41. This causes the scum and water away from the bottom of the rectangular scum inlet 102 to flow. During the flow, the water and scum enter the top of the inlet inclined plate 203. At this time, the gas inside the exhaust pipe 410 enters the top of the inlet inclined plate 203, thereby using the thrust of the gas to push the scum along the top of the inlet inclined plate 203 to move.

[0049] Specifically, the diversion frame 41 is snapped into the inside of the inlet inclined plate 203. The diversion frame 41 is shaped like a herringbone and has multiple drainage pipes. The screen plate 42 is snapped into the top of the diversion frame 41 and is used to screen between liquid and scum. The screen plate 42 is rectangular in shape. The exhaust pipe 410 is embedded in the inside of the diversion frame 41. The exhaust pipe 410 is divided into a main pipe 411 and a branch pipe 412. The main pipe 411 passes through the diversion frame 41 and its end is located inside the screen plate 42. The branch pipe 412 passes through the screen plate 42 and its end is located inside the main pipe 411. The angle of inclination of the branch pipe 412 with the ground is thirty degrees to prevent scum from entering the branch pipe 412.

[0050] like Figure 1 and Figure 2 As shown, the slag discharge structure also includes: a rectangular slag inlet 102, a slag discharge hole 202, and a telescopic pipe 206. The rectangular slag inlet 102 is connected to the outer tank 101, the slag discharge hole 202 is connected to the inner tank 201, and the telescopic pipe 206 is connected to the electric slag discharge valve 205. The rectangular slag inlet 102, the slag discharge hole 202, and the telescopic pipe 206 work together to guide the slag flow. The electric slag discharge valve 205 and the telescopic pipe 206 adopt a quick-release connection structure, which facilitates the quick disassembly, maintenance, and replacement of the electric slag discharge valve 205 or the telescopic pipe 206.

[0051] It facilitates the entry and discharge of scum, improves the efficiency of scum entry and discharge, and reduces the interference between scum discharge and sediment water, thereby reducing the time required for water sedimentation due to water mixing.

[0052] During use, the inner tank 201 is raised and lowered. When the inner tank 201 is raised and lowered, it drives the telescopic pipe 206 to compress. At this time, the inner tank 201 drives the inlet inclined plate 203 to enter the bottom of the rectangular slag inlet 102, so that the inner tank 201 cannot block the outer tank 101. At the same time, when the inlet inclined plate 203 enters the bottom of the rectangular slag inlet 102, the water and scum inside the flotation tank 1 enter the inner tank 201. The scum enters the electric scum discharge valve 205 through the scum discharge hole 202 of the inner tank 201. Then the electric scum discharge valve 205 is activated. When the electric scum discharge valve 205 is running, it drives the scum and water to be discharged along the telescopic pipe 206, thereby allowing the scum and water to be discharged from the equipment.

[0053] Specifically, a rectangular slag inlet 102 is provided on one side of the outer tank 101. The water level 3 is located at the bottom edge of the rectangular slag inlet 102 inside the flotation tank 1. Slag discharge holes 202 are provided at equal intervals at the bottom of the inner wall of the inner tank 201. An electric slag discharge valve 205 is installed at the bottom of the slag discharge hole 202 by screws. The outlet of the slag discharge hole 202 is connected to the inlet of the electric slag discharge valve 205. The outlet of the electric slag discharge valve 205 is equipped with a telescopic pipe 206 through a quick-release connection structure. The quick-release connection structure is a compression fitting installation structure in the prior art.

[0054] like Figures 6 to 9 As shown, the diversion structure also includes an adjustment structure, which includes a rotating plate 45 and a rubber strip 46. The rotating plate 45 is connected to the inside of the diversion frame 41, and the rubber strip 46 is connected to the outside of the rotating plate 45. Under the action of the rotating plate 45, the rubber strip 46 and the inner wall of the diversion frame 41 are made to fit together. The inlet inclined plate 203 is equipped with a drive structure, which includes a vertical rod 44, a rubber wheel 47, a belt connection structure 49, a positioning shaft 413, and a drive plate 414. The vertical rod 44 is connected to the diversion frame 41, the rubber wheel 47 is connected to the vertical rod 44, the belt connection structure 49 is connected to the rubber wheel 47, and the positioning shaft 413 is connected to the belt connection structure 49. Under the action of the belt connection structure 49, the positioning shaft 413 and the vertical rod 44 rotate synchronously. The drive plate 414 is connected to the positioning shaft 413, and the positioning shaft 413 makes the drive plate 414 and the vertical rod 44 rotate synchronously.

[0055] It enables the liquid inside the diversion frame 41 to flow in multiple directions and blocks the flow during the process, thereby changing the flow direction. At the same time, it facilitates the flow of gas or liquid, changes the difficulty of gas or liquid flow, and makes it easier to clean the surface of the diversion frame 41, ensuring the cleanliness of the surface of the diversion frame 41.

[0056] In use, the diversion frame 41 and the inlet inclined plate 203 descend due to the descent of the inner tank 201. As the inlet inclined plate 203 descends, it squeezes the water away from the bottom of the rectangular slag inlet 102. The squeezed water and slag flow through the inlet at the bottom of the diversion frame 41. Simultaneously, the squeezing force of the water causes the rotating plate 45 to rotate. The rotation of the rotating plate 45 drives the rubber strip 46 to rotate. After the rubber strip 46 and the rotating plate 45 rotate, they block the inflow direction at the top of the diversion frame 41. At this time, the water and slag flow out along one of the outlets of the diversion frame 41, which is near the slag discharge hole. At position 202, when the diversion frame 41 descends, the rubber wheel 47 is in contact with the inner wall of the outer groove 101, causing the rubber wheel 47 to rotate due to friction. As the rubber wheel 47 rotates, it drives the upright 44 to rotate. When the upright 44 rotates, it drives the belt connection structure 49 to run. During the operation of the belt connection structure 49, it drives the positioning shaft 413 to rotate. When the positioning shaft 413 rotates, it drives the drive plate 414 to rotate. When the drive plate 414 rotates, it drives the gas or liquid into the exhaust pipe 410, changing the difficulty of the gas or liquid entering the exhaust pipe 410.

[0057] Specifically, a circular column is connected through the inside of the rotating plate 45. The circular column is fixedly installed inside the diversion frame 41. The rotating plate 45 is rotatably connected to the outside of the circular column. Rubber strips 46 are glued to both ends of the rotating plate 45. A vertical rod 44 is rotatably connected inside the diversion frame 41. Rubber wheels 47 are symmetrically snapped onto the outside of the vertical rod 44. The outside of the rubber wheels 47 and the inside of the outer groove 101 are in contact with each other. A belt connection structure 49 is fixedly installed on the outside of the rubber wheels 47 at the position on the outer surface of the vertical rod 44. A positioning shaft 413 is rotatably connected to the inner wall of the diversion frame 41 near the exhaust pipe 410. A drive plate 414 is snapped onto the outside of the positioning shaft 413. A belt connection structure 49 is installed between the positioning shaft 413 and the outside of the vertical rod 44. The belt connection structure 49 is composed of two pulleys and a belt. The pulley outside the rotating shaft 43 is larger than the pulley outside the positioning shaft 413, thereby changing the rotation speed of the positioning shaft 413.

[0058] The present invention also provides a method for using a slag discharge device in an air flotation process, comprising the following steps:

[0059] Step 1: When slag discharge is required, the automatic control system gives a slag discharge signal, the magnetic electromagnetic switch is de-energized, and the inner tank 201 descends to the predetermined position where the lower end of the rectangular slag inlet 102 is submerged 50mm below the water surface under the absence of magnetic attraction.

[0060] Step 2: When the lower end of the rectangular slag inlet 102 is submerged at a predetermined position 50mm below the water surface, the scum on the water surface enters the inner tank 201 from the rectangular slag inlet 102 of the outer tank 101 and slides into the side wall of the inlet inclined plate 203.

[0061] Step 3: When the scum on the water surface slides into the inner tank 201, the inner tank 201 will sink due to gravity as the scum and water increase.

[0062] Step 4: The slag removal device for the air flotation process also includes a level gauge and an automatic control system. The level gauge is precisely installed inside the device and can monitor the changes in the liquid level of the inner tank 201 in real time. When the inner tank 201 sinks due to sedimentation or other reasons, and the sinking range reaches 100mm, the level gauge will quickly detect this change and immediately send a corresponding signal to the automatic control system. After receiving the signal, the automatic control system will immediately start the opening procedure of the electric slag removal valve 205, smoothly adjusting the opening degree of the electric slag removal valve 205 from the initial 0% to 30%, thereby performing the initial slag removal operation.

[0063] If the inner tank 201 continues to sink, when the cumulative sinking reaches 200mm, the level gauge will send a signal to the automatic control system again. The automatic control system will then adjust the opening of the electric slag discharge valve 205 a second time, increasing its opening from 30% to 50% to increase the slag discharge force in order to cope with the continuous changes in the liquid level of the inner tank.

[0064] When the inner tank 201 sinks by 300mm, the level gauge sends an emergency signal to the automatic control system. At this time, the automatic control system will respond quickly and rapidly increase the opening of the electric slag discharge valve 205 from 50% to 100% to achieve maximum slag discharge, ensuring that the liquid level in the inner tank can be restored to normal as soon as possible and maintaining the stable operation of the air flotation process.

[0065] Step 5: When the amount of scum and water in the inner tank 201 is less than the buoyancy of the flotation tank 1 on the inner tank 201, the inner tank 201 begins to float.

[0066] Step Six: After the inner tank 201 stops for 30 seconds at a distance of 50mm from the water surface at the lower end of the rectangular slag inlet 102, the electric slag discharge valve 205 is closed by the closing signal command, and the opening of the electric slag discharge valve 205 of the inner tank 201 is closed from 100% to 0%.

[0067] Working principle: During use, the automatic control system sends a slag discharge signal, and the magnetic electromagnetic switch is de-energized. At this time, the magnetic suction plate 204 is de-energized, preventing it from adhering to the inner tank 201. Without magnetic attraction, the inner tank 201 descends to a predetermined position where the lower end of the rectangular slag inlet 102 is submerged 50mm below the water surface. As the inner tank 201 descends, it compresses the telescopic tube 206, causing the inlet inclined plate to compress. Plate 203 enters the bottom of the rectangular slag inlet 102, preventing the inner tank 201 from being blocked from the outer tank 101. Simultaneously, when the inlet inclined plate 203 enters the bottom of the rectangular slag inlet 102, water and scum inside the flotation tank 1 enter the inner tank 201. When the lower end of the rectangular slag inlet 102 is submerged at a predetermined position 50mm below the water surface, the scum on the water surface slides from the rectangular slag inlet 102 of the outer tank 101 into the inner tank 201 through the side wall of the inlet inclined plate 203. When the scum on the water surface slides into the inner tank 201... At time 1, as the scum and water increase inside the inner tank 201, it sinks due to gravity. When the inner tank 201 sinks 100mm, the level gauge sends a feedback signal to the automatic control system. Upon receiving the signal, the automatic control system issues a command to open the electric scum discharge valve 205 of the inner tank 201. The opening degree of the electric scum discharge valve 205 at the bottom of the inner tank 201 increases from 0% to 30%. When the inner tank 201 continues to sink 200mm, the level gauge sends a feedback signal to the automatic control system, and the automatic control system receives the signal. Then, a signal command is issued to continue opening the electric slag discharge valve 205 of the inner tank 201. The opening degree of the electric slag discharge valve 205 at the bottom of the inner tank 201 is opened from 30% to 50%. When the inner tank 201 sinks 300mm, the level gauge feeds back a signal to the automatic control system. After receiving the signal, the automatic control system issues a signal command to continue opening the electric slag discharge valve 205 of the inner tank 201. The opening degree of the electric slag discharge valve 205 at the bottom of the inner tank 201 is opened from 50% to 100%, at which point automatic slag discharge is formed.

[0068] During the above process, and since the diversion frame 41 is installed inside the inlet inclined plate 203, the scum and water away from the bottom of the rectangular scum inlet 102 enter the top of the inlet inclined plate 203 along the diversion frame 41. This causes the scum and water away from the bottom of the rectangular scum inlet 102 to flow, and during the flow, the water and scum enter the top of the inlet inclined plate 203. At this time, the gas inside the exhaust pipe 410 enters the top of the inlet inclined plate 203, thereby using the thrust of the gas to push the scum along the top of the inlet inclined plate 203 to move.

[0069] During use, the diversion frame 41 and the inlet inclined plate 203 descend due to the descent of the inner tank 201. As the inlet inclined plate 203 descends, it squeezes the water away from the bottom of the rectangular slag inlet 102. The squeezed water and slag flow through the inlet at the bottom of the diversion frame 41. Simultaneously, the water's squeezing force causes the rotating plate 45 to rotate. The rotation of the rotating plate 45 drives the rubber strip 46 to rotate. After the rubber strip 46 and the rotating plate 45 rotate, they block the inlet direction at the top of the diversion frame 41, causing the water and slag to flow out along one of the outlets of the diversion frame 41, which is located near the slag discharge hole 202. Simultaneously, as the diversion frame 41 descends, the rubber wheel 47 comes into contact with the inner wall of the outer tank 101, causing the rubber wheel 47 to rotate due to friction. The rotation of the rubber wheel 47 drives the upright rod 44 to rotate. The belt connection structure 49 is driven to operate. During the operation of the belt connection structure 49, the positioning shaft 413 is driven to rotate. When the positioning shaft 413 rotates, the drive plate 414 rotates. When the drive plate 414 rotates, it drives the gas or liquid into the exhaust pipe 410, which changes the difficulty of the gas or liquid entering the exhaust pipe 410. At this time, the gas or liquid enters the main pipe 411 along the exhaust pipe 410, and then enters the top of the screen plate 42 along the branch pipe 412. At this time, the surface of the screen plate 42 is cleaned. During this process, the inner tank 201 is in the water intake state, but the water level inside the inner tank 201 has not yet covered the top of the diversion frame 41. When the screen plate 42 is completely immersed in water, the structure can only guide the liquid to flow and cannot drive the scum to move, so that the device can still operate.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A slag discharge device for an air flotation process, characterized in that, include: A sedimentation tank (1) is used for water treatment; The slag discharge structure includes an outer tank (101), an inner tank (201), an inlet inclined plate (203), a magnetic suction plate (204), and an electric slag discharge valve (205). The outer tank (101) is connected to the flotation tank (1), the inner tank (201) is connected to the outer tank (101), the inlet inclined plate (203) is connected above the inner tank (201), the magnetic suction plate (204) is connected to the inlet inclined plate (203) and is used to drive the inner tank (201) to rise and fall, and the electric slag discharge valve (205) is connected below the inner tank (201). The inner tank (201) is fixed inside the outer tank (101) by the magnetic suction plate (204). The inner tank (201) rises and falls inside the outer tank (101) by buoyancy, so that the slag enters the inner tank (201) and is discharged through the electric slag discharge valve (205). The inlet inclined plate (203) is internally equipped with a flow diversion structure, which includes: Diverter frame (41) is connected inside the inlet inclined plate (203); The sieve plate (42) is connected to the top of the diversion frame (41) and the sieve plate (42) is fixed by the diversion frame (41). An adjustment structure is also provided inside the diversion structure.

2. The slag discharge device for the air flotation process according to claim 1, characterized in that, The slag discharge structure also includes: A rectangular slag inlet (102) is connected to the outer tank (101). Slag discharge hole (202) is connected to the inner groove (201); The telescopic pipe (206) is connected to the electric slag discharge valve (205). The rectangular slag inlet (102), the slag discharge hole (202) and the telescopic pipe (206) work together to guide the slag.

3. The slag discharge device for the air flotation process according to claim 1, characterized in that, The adjustment structure includes: A rotating plate (45) is connected inside the diversion frame (41), and a rubber strip (46) is connected to the outside of the rotating plate (45). Under the action of the rotating plate (45), the rubber strip (46) and the inner wall of the diversion frame (41) are made to fit together.

4. The slag discharge device for the air flotation process according to claim 1, characterized in that, The imported inclined plate (203) has a drive structure installed inside, and the drive structure includes: The upright (44) is connected to the diversion frame (41). The rubber wheel (47) is connected to the upright (44). A belt connection structure (49) is connected to the rubber wheel (47). The positioning shaft (413) is connected to the belt connection structure (49), and the positioning shaft (413) and the upright (44) rotate synchronously through the belt connection structure (49).

5. The slag discharge device for the air flotation process according to claim 4, characterized in that, The driving structure further includes a driving plate (414) connected to the positioning shaft (413), which enables the driving plate (414) and the upright (44) to rotate synchronously.

6. The slag discharge device for the air flotation process according to claim 4, characterized in that, The flow divider (41) is equipped with an exhaust structure, which includes an exhaust pipe (410) connected to the flow divider (41) for guiding the flow of gas or liquid.

7. The slag discharge device for the air flotation process according to claim 2, characterized in that, The electric slag discharge valve (205) and the telescopic pipe (206) adopt a quick-release connection structure.

8. A method of using the slag discharge device for the air flotation process according to claim 7, characterized in that, Includes the following steps: Step 1: When slag discharge is required, the automatic control system gives a slag discharge signal, the magnetic electromagnetic switch is de-energized, and the inner tank (201) descends to the predetermined position where the lower end of the rectangular slag inlet (102) is submerged 50mm below the water surface under the suction force of the magnetic attraction. Step 2: When the lower end of the rectangular slag inlet (102) is submerged at a predetermined position 50mm below the water surface, the slag on the water surface enters the inner tank (201) from the rectangular slag inlet (102) of the outer tank (101) and slides into the side wall of the inlet inclined plate (203). Step 3: When the scum on the water surface slides into the inner tank (201), the inner tank (201) sinks due to gravity as the scum and water increase; Step 4: When the inner tank (201) sinks 100mm, the electric slag discharge valve (205) opens, and the opening degree of the electric slag discharge valve (205) increases from 0% to 30%. When the inner tank (201) continues to sink 200mm, the opening degree of the electric slag discharge valve (205) increases from 30% to 50%. When the inner tank (201) sinks 300mm, the opening degree of the electric slag discharge valve (205) increases from 50% to 100%. Step 5: When the amount of scum and water in the inner tank (201) is less than the buoyancy of the flotation tank (1) on the inner tank (201), the inner tank (201) begins to float. Step 6: After the inner tank (201) stops for 30 seconds at a distance of 50mm from the water surface at the lower end of the rectangular slag inlet (102), the electric slag discharge valve (205) closes with a signal command, and the opening of the electric slag discharge valve (205) of the inner tank (201) is closed from 100% to 0%.

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