Wastewater treatment device for recycled plastics processing

Abstract

The invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device for recycled plastic treatment, comprising a frame, an air flotation barrel, an injection pipe and an air flotation generating unit, wherein the top of the air flotation barrel is provided with an arc-shaped outer flange expanding outward, a piston base is coaxially provided at the bottom of the air flotation barrel, an impurity collection box is fixedly installed on the frame, the air flotation barrel is inserted into the impurity collection box, a filter layer is provided in the impurity collection box, a water collecting chamber is provided below the filter layer, a connecting pipe at the lowest end of the water collecting chamber is connected to a liquid outlet pipe provided on the air flotation barrel, a rotating ring is provided on the outer wall of the injection pipe of the frame, a scraper which fits the surface of the arc-shaped outer flange is provided on the rotating ring, and a driving unit is provided at the bottom of the frame, and in this embodiment, the driving unit drives the piston base to move back and forth in a vertical direction to raise the liquid level in the air flotation barrel to the arc-shaped outer flange, and at the same time, the rotating ring rotates around the outer wall of the injection pipe to enable the scraper to clean the surface of the arc-shaped outer flange.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device for recycled plastics treatment. Background Art

[0002] The pollutants in the recycled plastic washing wastewater mainly include alkali, phosphorus, organic matter, grease and suspended solids, part of which comes from the cleaning agent and the other part comes from the original impurities and stains on the plastic bottles. The composition of the washing wastewater is complex. In the traditional treatment of wastewater, the wastewater first flows through the grid to remove larger impurities and then enters the regulating tank. In the regulating tank, due to the effect of gravity, the sediment and other heavy substances in the wastewater will settle to the bottom of the tank, which plays a role in clarification. The effluent of the regulating tank is pumped to the flotation tank, which is equipped with an automatic dosing system to add polyaluminum chloride and polyacrylamide into the flotation tank along with the water flow.

[0003] During flotation, a scraper is usually used to scrape off impurities suspended on the surface of the wastewater. However, scraping off the impurities will take away some water in the flotation tank, resulting in a decrease in the content of the subsequently obtained recycled water, affecting the wastewater conversion efficiency. In addition, due to the presence of highly adhesive substances such as oil stains, after the scraper scrapes off the suspended impurities, some impurities will always stick to the scraper, affecting the efficiency of subsequent impurity removal. Summary of the invention

[0004] In view of the above problems, it is necessary to provide a wastewater treatment device for recycled plastics processing to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: A wastewater treatment device for recycled plastic processing comprises a frame, and an air flotation barrel vertically mounted on the frame, a liquid injection pipe is fixedly mounted on the frame, the output end of the liquid injection pipe is coaxially arranged with the air flotation barrel and vertically inserted into the frame from top to bottom, an air flotation generating unit is fixedly mounted on the frame, the working end of the air flotation generating unit is located inside the air flotation barrel, an arc-shaped outer flange expanding outward is arranged on the top of the air flotation barrel, a piston base is coaxially arranged on the bottom of the air flotation barrel, and the piston base reciprocates in the vertical direction to raise the liquid level in the air flotation barrel to the arc-shaped outer flange; an impurity collection box is fixedly mounted on the frame, the air flotation barrel is inserted into the impurity collection box, and the arc-shaped outer flange Located inside the impurity collection box, the bottom of the impurity collection box is inclined, and a filter layer for filtering moisture in flocculent impurities discharged from the flotation barrel is arranged inside the impurity collection box, and a water collecting chamber is arranged below the filter layer in the impurity collection box; the flotation barrel is located above the piston base and is provided with a liquid outlet pipe extending radially along the flotation barrel, and a connecting pipe is arranged at the lowest end of the water collecting chamber, and the output end of the connecting pipe is connected to the liquid outlet pipe; a swivel is arranged on the outer wall of the injection pipe of the frame, and a scraper fitting the arc-shaped outer flange surface is arranged on the swivel, and a driving unit is arranged at the bottom of the frame, and the driving unit drives the piston base to move in the vertical direction and drives the swivel to rotate around the outer wall of the injection pipe at the same time.

[0006] Preferably, a vertical shaft column is provided at the bottom of the piston base, and the shaft column extends to the outside of the air flotation barrel through an insertion hole provided at the bottom of the air flotation barrel, and a lifting block is fixedly installed at the bottom of the shaft column, and a horizontally extending waist-shaped hole is provided on the lifting block; the driving unit includes a rotary driver fixedly installed on the frame, and a rotating disk transmission-connected to the working end of the rotary driver, the rotating disk is rotatably installed on the frame, the axis of the rotating disk is horizontally arranged perpendicular to the axis of the shaft column, and a shifting rod parallel to the axis of the rotating disk is provided on the rotating disk, the shifting rod is inserted in the waist-shaped hole of the lifting block, and when the rotating disk rotates, the shifting rod drives the lifting block to move along the axis direction of the shaft column.

[0007] Preferably, a limit ring is provided on the inner wall of the air flotation barrel, the piston base moves below the limit ring, and the liquid outlet pipe is located above the limit ring; twice the straight-line distance between the axis of the lever and the axis of the rotating disk is not greater than the straight-line distance between the limit ring and the bottom of the air flotation barrel.

[0008] Preferably, a bevel gear ring is coaxially arranged on the rotating ring, and the bevel gear ring is meshed and connected with a bevel gear rotatably installed on the outer wall of the injection tube, the axis of the bevel gear is parallel to the axis of the rotating disk, the bevel gear is fixedly mounted on one end of a first connecting rod rotatably installed on the frame, and a first synchronous gear is coaxially arranged on the end of the first connecting rod away from the bevel gear; a second connecting rod is arranged at the axis of the rotating disk, and a second synchronous wheel is coaxially arranged on the end of the second connecting rod away from the rotating disk, and the second synchronous wheel is connected to the first synchronous gear through a synchronous belt transmission.

[0009] Preferably, the bevel gear ring is located above the rotating ring, the scraper extends radially along the rotating ring, and the bevel gear and the first connecting rod are located above the scraper.

[0010] Preferably, the bottom of the scraper has the same curvature as the curved outer flange surface, and a soft rubber strip that fits the curved outer flange surface is provided at the bottom of the scraper.

[0011] Preferably, a sealing ring is provided on the periphery of the piston base, and the sealing ring fits against the inner wall of the air flotation tank.

[0012] Preferably, a liquid level detector is fixedly installed on the outside of the injection tube; a conical mouth is provided at one end of the injection tube located inside the flotation barrel, and the conical mouth has a taper that gradually expands downward; a plug-in shaft extending vertically upward is provided on the upper side of the piston base, a sleeve is provided on the top end of the plug-in shaft, a spring is installed in the sleeve, the spring elastically connects the plug-in shaft and the sleeve, a sealing cone head is provided on the top end of the sleeve, the sealing cone head has a taper that gradually decreases upward, and when the lifting block moves upward, the sealing cone head blocks the conical mouth of the injection tube.

[0013] Preferably, the filter layer is provided with at least three layers, and hard permeable plates are provided at the top and the bottom of the filter layer, and a plurality of flexible filter cloths are provided inside the hard permeable plates.

[0014] Preferably, a blocking flap is rotatably installed at the lowest end of the impurity collection box, and the blocking flap blocks the lowest end of the impurity collection box; slide rails are arranged on both sides of the blocking flap, and sliders are slidably installed in the slide rails, and a horizontal connecting rod is arranged on the outward side of the slider, and a linear drive is fixedly installed on the outside of the impurity collection box, and the working end of the linear drive is rotatably connected to the connecting rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Firstly, a piston base which can be raised and lowered is arranged at the bottom of the air flotation barrel in the present invention, so that the floccules floating on the water surface flow outward from the arc-shaped outer flange at the top of the air flotation barrel and enter the impurity collection box for collection. The filter layer in the impurity collection box can filter the water discharged with the floccules, so that the floccules remain in the impurity collection box, and the water discharged with the floccules enters the water collection chamber through the filter layer. Since the impurity collection box is arranged inclined, the water entering the water collection chamber can flow along the inclined bottom of the water collection chamber to the connecting pipe at the lowest end of the water collection chamber, and flow through the connecting pipe to the liquid outlet pipe to be discharged together with the clean wastewater at the bottom of the air flotation barrel, thereby ensuring the wastewater utilization rate in the overall processing process.

[0016] Secondly, a scraper that fits the surface of the injection tube is provided on the swivel installed rotatably outside the injection tube in the present invention. The driving unit can drive the swivel to rotate around the outer wall of the injection tube while driving the piston base to move, so that the scraper moves in line with the surface of the arc-shaped outer flange, scrapes off the flocs remaining on the arc-shaped outer flange, ensures that the surface of the arc-shaped outer flange is smooth, and facilitates the subsequent discharge of the flocs.

[0017] Thirdly, the piston base and the piston base in the present invention move synchronously. When the piston base rises to the point where the sealing cone head seals the conical mouth of the injection tube, the injection tube can be prevented from continuously injecting water into the flotation barrel, so that the water level in the flotation barrel can be kept stable for flotation processing. The sealing cone head is connected by a telescopic cylinder composed of an insert shaft, a sleeve and a spring. Therefore, the piston base can continue to move upward when the sealing cone head seals the injection tube, so that the water level in the flotation barrel is raised to be flush with the top of the arc-shaped outer flange, and the flocs are discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional wastewater treatment device for recycled plastics processing. Figure 1 ; Figure 2 It is a front view of a wastewater treatment device for recycled plastics processing; Figure 3 yes Figure 2 A cross-sectional view at AA of FIG. Figure 4 yes Figure 3 A partial enlarged view of point B; Figure 5 It is a three-dimensional cross-sectional view of a wastewater treatment device for recycled plastics processing; Figure 6 yes Figure 5 A partial enlarged view of point C; Figure 7 yes Figure 5 A partial enlarged view of point D; Figure 8 yes Figure 5 A local enlarged view of point E; Fig. 9 It is a three-dimensional wastewater treatment device for recycled plastics processing. Figure 2 ; Fig.10 yes Fig. 9 A partial enlarged view of point F; Fig.11 yes Fig. 9 A partial enlarged view of point G.

[0019] The numbers in the figure are: 1, frame; 11, injection pipe; 111, liquid level detector; 112, conical mouth; 12, air flotation generating unit; 13, rotating ring; 131, scraper; 132, bevel gear ring; 133, bevel gear; 134, first connecting rod; 135, first synchronous gear; 136, soft rubber strip; 14, driving unit; 141, rotating driver; 142, rotating disk; 143, lever; 144, second connecting rod; 145, second synchronous wheel; 146, synchronous belt; 2, air flotation barrel; 21, arc-shaped outer flange; 22. Piston base; 221. Shaft column; 222. Lifting block; 223. Waist-shaped hole; 224. Sealing ring; 225. Insert shaft; 226. Sleeve; 227. Spring; 228. Sealing cone head; 23. Liquid outlet pipe; 24. Insert hole; 25. Limiting ring; 3. Impurity collection box; 31. Filter layer; 311. Hard permeable plate; 312. Flexible filter cloth; 32. Water collecting chamber; 321. Connecting pipe; 33. Sealing flap; 331. Slide rail; 332. Sliding block; 333. Connecting rod; 334. Linear drive. DETAILED DESCRIPTION

[0020] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Reference Figures 1 to 11 : A wastewater treatment device for recycled plastic treatment comprises a frame 1 and an air flotation barrel 2 vertically mounted on the frame 1, a liquid injection pipe 11 is fixedly mounted on the frame 1, the output end of the liquid injection pipe 11 is coaxially arranged with the air flotation barrel 2 and vertically inserted into the frame 1 from top to bottom, an air flotation generating unit 12 is fixedly mounted on the frame 1, the working end of the air flotation generating unit 12 is located inside the air flotation barrel 2, an arc-shaped outer flange 21 expanding outward is arranged on the top of the air flotation barrel 2, a piston base 22 is coaxially arranged on the bottom of the air flotation barrel 2, and the piston base 22 reciprocates in the vertical direction to raise the liquid level in the air flotation barrel 2 to the arc-shaped outer flange 21; the frame 1 is fixed An impurity collection box 3 is installed, the air flotation barrel 2 is inserted in the impurity collection box 3, the arc-shaped outer flange 21 is located inside the impurity collection box 3, the bottom of the impurity collection box 3 is inclined, and a filter layer 31 for filtering the moisture in the flocculent impurities discharged from the air flotation barrel 2 is provided in the impurity collection box 3, and a water collection chamber 32 is provided below the filter layer 31 in the impurity collection box 3; the air flotation barrel 2 is provided with a liquid outlet pipe 23 extending radially along the air flotation barrel 2 above the piston base 22, and a connecting pipe 321 is provided at the lowest end of the water collection chamber 32, and the output end of the connecting pipe 321 is connected to the liquid outlet pipe 23; a rotating ring 13 (combined with a rotating ring 13) is provided on the outer wall of the injection pipe 11 of the frame 1 Figure 1 and Fig.10), a scraper 131 is arranged on the rotating ring 13 to fit the surface of the arc-shaped outer flange 21, and a driving unit 14 is arranged at the bottom of the frame 1. The driving unit 14 drives the piston base 22 to move in the vertical direction and drives the rotating ring 13 to rotate around the outer wall of the injection tube 11.

[0022] In the wastewater treatment device of the present application, the staff injects the wastewater injected with flocculant into the flotation barrel 2 through the injection pipe 11, and the flotation generating unit 12 performs pressurized flotation processing on the wastewater in the flotation barrel 2, so that the floccules are attached to the tiny bubbles and float upward. The top of the flotation barrel 2 is provided with an arc-shaped outer flange 21. When a certain amount of floccules float on the water surface in the flotation barrel 2, the driving unit 14 can drive the piston base 22 at the bottom of the flotation barrel 2 to move upward, pushing the water in the flotation barrel 2 to move upward, so that the floccules flow outward from the arc-shaped outer flange 21 at the top of the flotation barrel 2 and enter the impurity collection box 3 for collection. The clean wastewater at the bottom of the flotation barrel 2 can be discharged outward through the liquid outlet pipe 23 for subsequent processing. The flotation barrel 2 After the flocs floating on the top of the wastewater in the tank are discharged, the piston base 22 moves downward to lower the water level in the flotation barrel 2, which is convenient for the subsequent entry of wastewater and the subsequent generation of flocs. In this embodiment, the filter layer 31 in the impurity collection box 3 can filter the water discharged with the flocs, so that the flocs remain in the impurity collection box 3, and the water discharged with the flocs enters the water collecting chamber 32 through the filter layer 31. Since the impurity collection box 3 is inclined, the water entering the water collecting chamber 32 can flow along the inclined bottom of the water collecting chamber 32 to the connecting pipe 321 at the lowest end of the water collecting chamber 32, and flow through the connecting pipe 321 to the liquid outlet pipe 23 and be discharged together with the clean wastewater at the bottom of the flotation barrel 2, thereby ensuring the wastewater utilization rate in the overall processing process. The curvature of the surface of the arc-shaped outer flange 21 in this embodiment can ensure that when the water level in the air flotation barrel 2 reaches the highest position of the top of the arc-shaped outer flange 21, the water in the air flotation barrel 2 can overflow to the outside and drive the flocs floating on the water surface to leave the air flotation barrel 2. The injection pipe 11 and the air flotation barrel 2 are on the same axis. The swivel 13 rotatably installed outside the injection pipe 11 is provided with a scraper 131 that fits the surface of the arc-shaped outer flange 21. The driving unit 14 can drive the swivel 13 to rotate around the outer wall of the injection pipe 11 while driving the piston base 22 to move, so that the scraper 131 fits the surface of the arc-shaped outer flange 21 and moves, and the flocs remaining on the arc-shaped outer flange 21 are scraped off, ensuring that the surface of the arc-shaped outer flange 21 is smooth, which is convenient for the subsequent discharge of flocs.

[0023] In order to solve the problem of how the driving unit 14 drives the piston base 22 to move vertically in the air flotation tank 2, the following features are specifically set: A vertical shaft column 221 is provided at the bottom of the piston base 22, and the shaft column 221 extends to the outside of the air flotation barrel 2 through the insertion hole 24 provided at the bottom of the air flotation barrel 2, and a lifting block 222 is fixedly installed at the bottom of the shaft column 221, and a horizontally extending waist-shaped hole 223 is provided on the lifting block 222; the driving unit 14 includes a rotating driver 141 fixedly installed on the frame 1, and a rotating disk 142 connected to the working end of the rotating driver 141, the rotating disk 142 is rotatably installed on the frame 1, and the axis of the rotating disk 142 is horizontally arranged perpendicular to the axis of the shaft column 221, and a shifting rod 143 parallel to the axis of the rotating disk 142 is provided on the rotating disk 142, and the shifting rod 143 is inserted in the waist-shaped hole 223 of the lifting block 222, and when the rotating disk 142 rotates, the shifting rod 143 drives the lifting block 222 to move along the axis direction of the shaft column 221.

[0024] The driving unit 14 in this embodiment uses a rotary driver 141 as a single power source. The rotary driver 141 can be a servo motor. The working end of the rotary driver 141 is connected to the rotating disk 142. When the rotating disk 142 rotates, the lever 143 on the rotating disk 142 is located in the waist-shaped hole 223 on the lifting block 222 connected to the bottom of the piston base 22 and rotates, thereby pushing the lifting block 222 to reciprocate in the vertical direction to adjust the water level in the air flotation tank 2. The lever 143 is located on one side of the axis of the rotating disk 142, so that the height position can be changed when the rotating disk 142 rotates. The lifting block 222 is connected to the piston base 22 through the shaft column 221, and the shaft column 221 is inserted into the insertion hole 24 set at the bottom of the air flotation tank 2, so that it can be ensured that the lifting block 222 can only move in the vertical direction when pushed by the lever 143.

[0025] In order to solve the problem of how to limit the moving distance of the piston base 22 in the air flotation barrel 2 to prevent the position of the lifting block 222 from exceeding the input end of the liquid outlet pipe 23, the following features are specifically set: A limit ring 25 is provided on the inner wall of the air flotation barrel 2, the piston base 22 is located below the limit ring 25 and moves, and the liquid outlet pipe 23 is located above the limit ring 25; twice the straight-line distance between the axis of the lever 143 and the axis of the rotating disk 142 is not greater than the straight-line distance between the limit ring 25 and the bottom of the air flotation barrel 2.

[0026] The piston base 22 in this embodiment is located below the limiting ring 25 for movement, and the liquid outlet pipe 23 is arranged above the limiting ring 25, so as to ensure that even if the piston base 22 is raised to the highest position, it is still impossible to exceed the input end of the liquid outlet pipe 23. The moving range of the piston base 22 in the vertical direction is equal to the diameter of the rotation path of the lever 143. Therefore, when twice the straight-line distance between the axis of the lever 143 and the axis of the rotating disk 142 is not greater than the straight-line distance between the limiting ring 25 and the bottom of the air flotation barrel 2, it can be ensured that the movement of the lever 143 can only drive the piston base 22 to move in the area between the limiting ring 25 and the bottom of the air flotation barrel 2, and will not collide with the limiting ring 25 or the bottom of the air flotation barrel 2.

[0027] In order to solve the problem of how to realize that the driving unit 14 drives the piston base 22 to rise and fall while driving the swivel 13 to rotate, the following features are specifically set: A bevel gear ring 132 is coaxially arranged on the rotating ring 13, and the bevel gear ring 132 is meshed with a bevel gear 133 rotatably installed on the outer wall of the injection tube 11. The axis of the bevel gear 133 is parallel to the axis of the rotating disk 142. The bevel gear 133 is fixedly mounted on one end of a first connecting rod 134 rotatably installed on the frame 1, and a first synchronous gear 135 is coaxially arranged on the end of the first connecting rod 134 away from the bevel gear 133; a second connecting rod 144 is arranged at the axis of the rotating disk 142, and a second synchronous wheel 145 is coaxially arranged on the end of the second connecting rod 144 away from the rotating disk 142, and the second synchronous wheel 145 is connected to the first synchronous gear 135 through a synchronous belt 146.

[0028] The rotating disk 142 in this embodiment is coaxially connected with the second synchronous wheel 145 through the second connecting rod 144. When the rotating disk 142 rotates, the first synchronous gear 135 is driven to rotate through the transmission cooperation of the second synchronous wheel 145 and the synchronous belt 146. The first synchronous gear 135 drives the bevel gear 133 to rotate through the first connecting rod 134. The bevel gear 133 is meshed with the bevel gear ring 132 coaxially installed on the upper side of the rotating ring 13. Therefore, the rotation of the bevel gear 133 can drive the bevel gear ring 132 and the rotating ring 13 to rotate synchronously around their own axes, thereby realizing the movement of the scraper 131 around the surface of the arc-shaped outer flange 21, and cleaning the flocs attached to the surface of the arc-shaped outer flange 21. The driving unit 14 only uses a power source of the rotary driver 141 to drive the lifting and lowering of the piston base 22 and the movement of the scraper 131 synchronously.

[0029] In order to avoid obstruction to the movement of the scraper 131, the following features are specifically provided: The bevel gear ring 132 is located above the rotating ring 13 , the scraper 131 extends radially along the rotating ring 13 , and the bevel gear 133 and the first connecting rod 134 are located above the scraper 131 .

[0030] The bevel gear ring 132, bevel gear 133, and first connecting rod 134 in this embodiment are all located on the upper side of the swivel 13. Therefore, when the scraper 131 is located on the side of the swivel 13 and moves, it will not contact the bevel gear ring 132, bevel gear 133, first connecting rod 134, and the mounting seat for rotating the bevel gear 133 and the first connecting rod 134, thereby maintaining smooth rotation of the swivel 13.

[0031] In order to ensure the degree of fit between the scraper 131 and the surface of the arc-shaped outer flange 21, the following features are specifically set: The bottom of the scraper 131 has the same curvature as the surface of the arc-shaped outer flange 21 , and a soft rubber strip 136 is provided at the bottom of the scraper 131 to fit the surface of the arc-shaped outer flange 21 .

[0032] The bottom of the scraper 131 in this embodiment has the same curvature as the surface of the arc-shaped outer flange 21, so the soft rubber strip 136 installed at the bottom of the scraper 131 can fit the surface of the arc-shaped outer flange 21, and the soft rubber strip 136 is made of a flexible rubber material. During the rotation of the swivel 13, the scraper 131 and the soft rubber strip 136 can fully clean the surface of the arc-shaped outer flange 21, and the flocs scraped off by the scraper 131 can fit the surface of the arc-shaped outer flange 21 and slide into the impurity collection box 3.

[0033] In order to ensure that the waste water in the air flotation barrel 2 will not leak through the contact position between the piston base 22 and the inner wall of the air flotation barrel 2, the following features are specifically set: A sealing ring 224 is disposed on the periphery of the piston base 22 , and the sealing ring 224 fits against the inner wall of the air flotation tank 2 .

[0034] When the piston base 22 in this embodiment moves, the sealing ring 224 installed in the groove around the piston base 22 keeps in contact with the inner wall of the air flotation barrel 2, thereby sealing the contact position between the piston base 22 and the inner wall of the air flotation barrel 2 to prevent waste water in the air flotation barrel 2 from leaking.

[0035] In order to solve the problem of how to prevent the injection pipe 11 from continuously injecting water into the air flotation barrel 2 when the piston base 22 raises the water level in the air flotation barrel 2, the following features are specifically provided: A liquid level detector 111 is fixedly installed on the outside of the injection pipe 11; a conical opening 112 is provided at one end of the injection pipe 11 located inside the air flotation tank 2, and the conical opening 112 has a taper that gradually expands downward (such as Figure 8 As shown); a plug-in shaft 225 extending vertically upward is provided on the upper side of the piston base 22, a sleeve 226 is sleeved on the top of the plug-in shaft 225, a spring 227 is installed in the sleeve 226, the spring 227 elastically connects the plug-in shaft 225 and the sleeve 226, a blocking cone head 228 is provided on the top of the sleeve 226, and the blocking cone head 228 has a taper that gradually decreases upwards. When the lifting block 222 moves upward, the blocking cone head 228 blocks the tapered mouth 112 of the injection tube 11.

[0036] The liquid level detector 111 outside the injection tube 11 in this embodiment can detect the water level in the air flotation barrel 2. The liquid level detector 111 can be connected to the rotary driver 141 through the controller signal. When the water level in the air flotation barrel 2 reaches a certain height, the rotary driver 141 can be started to drive the piston base 22 to rise. The piston base 22 rises to the blocking cone head 228 to block the conical opening 112 of the injection tube 11, thereby preventing the injection tube 11 from continuously injecting water into the air flotation barrel 2. The water level in the air flotation barrel 2 is kept stable for air flotation processing, and then the rotary driver 141 is rotated. The driver 141 drives the piston base 22 to continue to rise, and the blocking cone head 228 is connected through a telescopic cylinder composed of an insert shaft 225, a sleeve 226 and a spring 227. Therefore, the piston base 22 can continue to move upward when the blocking cone head 228 blocks the injection pipe 11, so that the water level in the air flotation barrel 2 is raised to be flush with the top of the arc-shaped outer flange 21, and the floccules are discharged. Subsequently, the piston base 22 moves down to the lowest position, and the blocking cone head 228 is separated from the tapered mouth 112 to release the blockage of the injection pipe 11, so that the injection pipe 11 can re-inject waste liquid into the air flotation barrel 2.

[0037] In order to solve the problem of how to separate the flocs and water entering the impurity collection box 3, the following features are specifically set: The filter layer 31 is provided with at least three layers. The top and bottom of the filter layer 31 are provided with hard permeable plates 311 , and a plurality of flexible filter cloths 312 are provided inside the hard permeable plates 311 .

[0038] The filter layer 31 in this embodiment is composed of a hard permeable plate 311 and a flexible filter cloth 312. The flexible filter cloth 312 is sandwiched between two layers of hard permeable plates 311 to keep it unfolded and fixed in position, thereby ensuring the filtering effect on the flocs. The hard permeable plate 311 is made of hard material, which also facilitates the subsequent cleaning of the flocs in the impurity collection box 3.

[0039] In order to ensure that the water entering the impurity collection box 3 can have sufficient time to separate from the floccules, the following features are specifically set: The lowest end of the impurity collecting box 3 is rotatably mounted with a blocking flap 33, which blocks the lowest end of the impurity collecting box 3; slide rails 331 (such as Fig.11 As shown), a slider 332 is slidably installed in the slide rail 331, a horizontal connecting rod 333 is set on the outward side of the slider 332, and a linear drive 334 is fixedly installed on the outer side of the impurity collection box 3, and the working end of the linear drive 334 is rotatably connected to the connecting rod 333.

[0040] The impurity collection box 3 in this embodiment is tilted, and the lowest end of the impurity collection box 3 is blocked by the blocking flap 33, so the floccules and water entering the impurity collection box 3 can be fully separated in the impurity collection box 3, and the working end of the linear drive 334 arranged outside the impurity collection box 3 is rotatably connected with the connecting rods 333 sliding on both sides of the blocking flap 33, so the linear drive 334 can control the blocking flap 33 to flip, open the bottom opening of the impurity collection box 3, and facilitate the discharge of floccules accumulated at the lowest point of the impurity collection box 3, and also facilitate the staff to clean the inside of the impurity collection box 3. The linear drive 334 in this embodiment can be an electric push rod or a cylinder.

[0041] Working principle: The staff injects the wastewater injected with flocculant into the flotation barrel 2 through the injection pipe 11, and the flotation generating unit 12 performs pressurized flotation processing on the wastewater in the flotation barrel 2, so that the floccules are attached to the tiny bubbles and float upward. The top of the flotation barrel 2 is provided with an arc-shaped outer flange 21. When a certain amount of floccules float on the water surface in the flotation barrel 2, the driving unit 14 can drive the piston base 22 at the bottom of the flotation barrel 2 to move upward, pushing the water in the flotation barrel 2 to move upward, so that the floccules flow out from the arc-shaped outer flange 21 at the top of the flotation barrel 2 and enter the impurity collection box 3 for collection. The filter layer 31 in the impurity collection box 3 can follow The water discharged by the flocs is filtered so that the flocs remain in the impurity collection box 3, and the water discharged with the flocs enters the water collection chamber 32 through the filter layer 31. Since the impurity collection box 3 is arranged tilted, the water entering the water collection chamber 32 can flow along the tilted bottom of the water collection chamber 32 to the connecting pipe 321 at the lowest end of the water collection chamber 32, and flows through the connecting pipe 321 to the liquid outlet pipe 23 to be discharged together with the clean wastewater at the bottom of the air flotation barrel 2 for subsequent processing. After the flocs floating on the top of the wastewater in the air flotation barrel 2 are discharged, the piston base 22 moves downward to lower the water level in the air flotation barrel 2, which is convenient for the subsequent entry of wastewater and the subsequent generation of flocs.

[0042] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A wastewater treatment device for recycled plastics, comprising a frame (1), and an air flotation barrel (2) vertically mounted on the frame (1), a liquid injection pipe (11) fixedly mounted on the frame (1), an output end of the liquid injection pipe (11) being coaxially arranged with the air flotation barrel (2) and vertically inserted into the frame (1) from top to bottom, a flotation generating unit (12) fixedly mounted on the frame (1), a working end of the air flotation generating unit (12) being located inside the air flotation barrel (2), characterized in that: The top of the air flotation barrel (2) is provided with an outwardly expanding arc-shaped outer flange (21), and the bottom of the air flotation barrel (2) is coaxially provided with a piston base (22), and the piston base (22) reciprocates in the vertical direction to raise the liquid level in the air flotation barrel (2) to the arc-shaped outer flange (21); An impurity collection box (3) is fixedly mounted on the frame (1), the air flotation barrel (2) is inserted into the impurity collection box (3), the arc-shaped outer flange (21) is located inside the impurity collection box (3), the bottom of the impurity collection box (3) is arranged at an angle, a filter layer (31) is arranged inside the impurity collection box (3) for filtering water in flocculent impurities discharged from the air flotation barrel (2), and a water collection chamber (32) is arranged below the filter layer (31) in the impurity collection box (3); The air flotation barrel (2) is provided with a liquid outlet pipe (23) extending radially along the air flotation barrel (2) above the piston base (22); a connecting pipe (321) is provided at the lowest end of the water collecting chamber (32); and the output end of the connecting pipe (321) is connected to the liquid outlet pipe (23); A rotating ring (13) is arranged on the outer wall of the injection pipe (11) of the frame (1), and a scraper (131) is arranged on the rotating ring (13) and fits the surface of the arc-shaped outer flange (21). A driving unit (14) is arranged at the bottom of the frame (1), and the driving unit (14) drives the piston base (22) to move in the vertical direction and drives the rotating ring (13) to rotate around the outer wall of the injection pipe (11).

2. A wastewater treatment device for recycled plastics according to claim 1, characterized in that: A vertical shaft column (221) is provided at the bottom of the piston base (22), and the shaft column (221) passes through an insertion hole (24) provided at the bottom of the air flotation barrel (2) and extends to the outside of the air flotation barrel (2). A lifting block (222) is fixedly installed at the bottom of the shaft column (221), and a horizontally extending waist-shaped hole (223) is provided on the lifting block (222); The driving unit (14) comprises a rotary driver (141) fixedly mounted on a frame (1), and a rotating disk (142) drivingly connected to a working end of the rotary driver (141); the rotating disk (142) is rotatably mounted on the frame (1), the axis of the rotating disk (142) being arranged horizontally perpendicular to the axis of the shaft column (221); a lever (143) parallel to the axis of the rotating disk (142) is arranged on the rotating disk (142); the lever (143) is inserted into a waist-shaped hole (223) of a lifting block (222); when the rotary disk (142) rotates, the lever (143) drives the lifting block (222) to move along the axis direction of the shaft column (221).

3. A wastewater treatment device for recycled plastics according to claim 2, characterized in that: A limit ring (25) is provided on the inner wall of the air flotation barrel (2), the piston base (22) is located below the limit ring (25) for movement, and the liquid outlet pipe (23) is located above the limit ring (25); Two times the straight-line distance between the axis of the lever (143) and the axis of the rotating disk (142) is no greater than the straight-line distance between the limiting ring (25) and the bottom of the air flotation barrel (2).

4. A wastewater treatment device for recycled plastics according to claim 3, characterized in that: A bevel gear ring (132) is coaxially arranged on the rotating ring (13), the bevel gear ring (132) is meshedly connected with a bevel gear (133) rotatably mounted on the outer wall of the injection pipe (11), the axis of the bevel gear (133) is parallel to the axis of the rotating disk (142), the bevel gear (133) is fixedly mounted on one end of a first connecting rod (134) rotatably mounted on the frame (1), and a first synchronous gear (135) is coaxially arranged on one end of the first connecting rod (134) away from the bevel gear (133); A second connecting rod (144) is arranged at the axis of the rotating disk (142); a second synchronous wheel (145) is coaxially arranged at one end of the second connecting rod (144) away from the rotating disk (142); the second synchronous wheel (145) is connected to the first synchronous gear (135) via a synchronous belt (146).

5. A wastewater treatment device for recycled plastics according to claim 4, characterized in that: The bevel gear ring (132) is located above the rotating ring (13), the scraper (131) extends radially along the rotating ring (13), and the bevel gear (133) and the first connecting rod (134) are located above the scraper (131).

6. A wastewater treatment device for recycled plastics according to claim 4, characterized in that: The bottom of the scraper (131) has the same curvature as the surface of the arc-shaped outer flange (21), and a soft rubber strip (136) is provided at the bottom of the scraper (131) to fit the surface of the arc-shaped outer flange (21).

7. A wastewater treatment device for recycled plastics according to claim 4, characterized in that: A sealing ring (224) is provided on the circumference of the piston base (22), and the sealing ring (224) fits against the inner wall of the air flotation barrel (2).

8. A wastewater treatment device for recycled plastics according to claim 4, characterized in that: A liquid level detector (111) is fixedly mounted on the outside of the liquid injection pipe (11); One end of the injection pipe (11) located inside the air flotation barrel (2) is provided with a tapered opening (112), and the tapered opening (112) has a taper that gradually expands downwards; The piston base (22) is provided with an insert shaft (225) extending vertically upward on the upper side, the insert shaft (225) is sleeved with a sleeve (226) at the top end, a spring (227) is installed in the sleeve (226), the spring (227) elastically connects the insert shaft (225) and the sleeve (226), and the sleeve (226) is provided with a blocking cone head (228) at the top end, the blocking cone head (228) has a taper that gradually decreases upward, and when the lifting block (222) moves upward, the blocking cone head (228) blocks the tapered opening (112) of the injection pipe (11).

9. A wastewater treatment device for recycled plastics according to claim 4, characterized in that: The filter layer (31) is provided with at least three layers, and a hard permeable plate (311) is provided at the top and the bottom of the filter layer (31), and a plurality of flexible filter cloths (312) are provided inside the hard permeable plate (311).

10. A wastewater treatment device for recycled plastics according to claim 4, characterized in that: A blocking flap (33) is rotatably mounted on the lowest end of the impurity collection box (3), and the blocking flap (33) blocks the lowest end of the impurity collection box (3); Slide rails (331) are arranged on both sides of the blocking flap (33), a slider (332) is slidably mounted in the slide rails (331), a horizontal connecting rod (333) is arranged on the outward side of the slider (332), a linear drive (334) is fixedly mounted on the outside of the impurity collection box (3), and a working end of the linear drive (334) is rotatably connected to the connecting rod (333).

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