Construction waste light substance water flotation separation device

Abstract

The invention relates to the field of construction waste regeneration, in particular to a construction waste light substance water flotation separation device. The technical problems that a separation mechanism of an existing circulation type flotation machine is of a structure immersed in water, parts are prone to abrasion with water and impurities, the service life is shortened, then the service life of equipment is shortened, the water content of separated light substances is high, and the convenience of follow-up treatment of the light substances is poor are solved. A building waste light substance water flotation separation device comprises a supporting frame, a separation box fixedly connected to the supporting frame, a water collecting pool fixedly connected to the lower portion of the supporting frame and a water suction pump fixedly connected to the lower portion of the supporting frame. A large amount of water and impurities are prevented from making contact with the driving shaft and the driven shaft through the first water stop plate and the second water stop plate, water and heavy objects discharged from the bottom of the separation box are directly filtered and discharged through the draining plate, the probability that the water and the impurities make contact with parts can be reduced, the service life of the parts in the separation structure is prolonged, and then the working life of equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of construction waste recycling, and more particularly to a water flotation separation device for lightweight materials in construction waste. Background Technology

[0002] Water flotation of lightweight materials in construction waste is one of the core processes for the resource utilization of construction waste. Through the buoyancy or flow of water, lightweight materials with lower density (such as plastics, wood, paper, and cloth strips) and heavy aggregates (such as concrete blocks, bricks, and sand) in construction waste are separated. The separated lightweight materials can be used as fuel rods in thermal power plants, while the separated heavy aggregates can be reused as building materials.

[0003] Existing water flotation separation devices for light materials in construction waste are generally circulating flotation machines. During operation, crushed construction waste enters a tank filled with circulating water. Light materials float to the surface due to buoyancy, while heavy aggregates sink to the bottom. Two sets of belt conveyors then separate the two materials of different masses from the water. However, the belt conveyors and other separation components of existing circulating flotation machines are submerged in water. These parts are easily worn due to prolonged immersion in wastewater and contact with water and impurities, leading to a shortened service life and consequently reducing the equipment's operational life. Furthermore, the separated light materials have a high water content, making subsequent transfer and processing inconvenient and hindering the ease of subsequent treatment of light materials. Summary of the Invention

[0004] To overcome the shortcomings of existing circulating flotation machines, which employ a water-immersed separation mechanism that is prone to wear and tear on parts due to water and impurities, leading to a shortened service life and reduced equipment lifespan, and also result in high water content in the separated light materials, making subsequent transfer and processing inconvenient and hindering convenient post-processing of light materials, this invention provides a water flotation separation device for construction waste light materials that employs a non-water-immersed separation structure. This reduces the probability of water and impurities contacting the components, increases the service life of each component in the separation structure, thereby extending the equipment's service life, and also reduces the water content of the separated light materials, improving the convenience of subsequent processing of light materials.

[0005] The technical solution of the present invention is: a water flotation separation device for lightweight materials in construction waste, comprising a support frame;

[0006] The separation box is fixed to the upper part of the support frame, and water outlets are opened on the bottom and one side of the upper part of the separation box;

[0007] A water collection tank fixed to the lower part of the support frame;

[0008] Two water pumps are fixed to the lower part of the support frame;

[0009] Two axial flow water pumps are fixed to one side of the separation tank;

[0010] Two return water pipes are fixed to the support frame. The upper end of the return water pipe is fixed to the inlet of the axial flow water pump, and the lower end of the return water pipe is fixed to the outlet of the pump.

[0011] Two hydraulic push rods are installed on the upper part of the support frame;

[0012] A limiting plate is fixed between two hydraulic push rods and a telescopic rod, and the limiting plate is slidably connected to the separation box.

[0013] Lightweight separation mechanism installed on the support frame and separation box;

[0014] Heavy separation mechanism installed on the support frame.

[0015] In one embodiment, a water level line is engraved at the outlet on the upper side of the separation tank.

[0016] In one embodiment, the lightweight separation mechanism includes a drive shaft rotatably connected to the upper part of the support frame, a driven shaft rotatably connected to the upper part of the support frame, a conveyor belt disposed between the drive shaft and the driven shaft, a first water baffle fixed to the upper part of the inner wall of the support frame, the first water baffle fixed to the separation box, a second water baffle fixed to the upper part of the inner wall of the support frame, two blocking frames fixed between the support frame and the first water baffle, and a drive assembly disposed between the support frame and the drive shaft.

[0017] In one embodiment, the drive assembly includes a servo motor fixed to a support frame, a first sprocket fixed to the output shaft of the servo motor, a second sprocket fixed to the drive shaft, a chain disposed between the first sprocket and the second sprocket, and a protective shell fixed to the support frame, the protective shell covering the first sprocket, the second sprocket and the chain.

[0018] In one embodiment, the heavy-duty separation mechanism includes two sets of hydraulic push rods fixed to a support frame, two receiving frames slidably connected to the support frame, a connecting frame fixed to the receiving frames, the connecting frame being fixed to the telescopic rod of the hydraulic push rods, and an opening and closing assembly disposed on the support frame and the receiving frames.

[0019] In one embodiment, the opening and closing assembly includes a sliding frame slidably connected to the receiving frame, a sleeve fixedly connected to the receiving frame, a return spring disposed between the sliding frame and the sleeve, a drain plate slidably connected to the receiving frame and fixedly connected to the sliding frame, and a contact frame disposed on one side of the support frame, wherein the sliding frame and the contact frame will contact each other.

[0020] In one embodiment, it further includes a pressing mechanism disposed between the support frame and the driven shaft. The pressing mechanism includes two rotating frames rotatably connected to the upper part of the support frame, two sets of transmission components disposed between the driven shaft and the two rotating frames, a lower pressing frame slidably connected to the upper part of the support frame, two connecting rods hinged to the lower pressing frame, the two connecting rods being respectively hinged to the two rotating frames, a plurality of rollers rotatably connected to the lower part of the lower pressing frame, and a pressure plate fixed to the upper part of the inner wall of the support frame.

[0021] In one embodiment, the transmission assembly includes a drive wheel fixed to the driven shaft, a driven wheel fixed to the rotating frame, and a transmission belt wound between the drive wheel and the driven wheel.

[0022] In one embodiment, it also includes a jet frame fixed to one side of the support frame.

[0023] In one embodiment, it further includes a scraper fixed to the upper part of the inner wall of the support frame, the scraper contacting one side of the conveyor belt.

[0024] The beneficial effects are: 1. After construction waste enters the water, under the action of gravity, the heavy materials will sink downward and be discharged through the outlet at the bottom of the separation box, while the light materials will float on the surface of the water under the action of buoyancy. The axial flow pump generates an impact water flow that pushes the light materials floating on the surface of the water towards the outlet at the top of the separation box for discharge, which can quickly separate the light and heavy materials in the construction waste.

[0025] 2. This device adopts a separation structure that is not immersed in water. Water baffle one and water baffle two limit and guide the water discharged from the upper outlet of the separation box, avoiding a large amount of water and impurities from contacting the drive shaft and driven shaft. The water and heavy objects discharged from the bottom outlet of the separation box are directly filtered by the dewatering plate and discharged. Through the above operation, the probability of water and impurities contacting the parts can be reduced, the service life of the parts in the separation structure can be increased, and thus the service life of the equipment can be extended.

[0026] 3. The driven shaft rotates, driving the rotating frame to rotate through the transmission assembly. The rotating frame rotates, pulling the lower pressure frame downward through the connecting rod. The downward movement of the lower pressure frame drives the roller to move downward. The roller moves downward and contacts the light material on the conveyor belt, squeezing the light material in contact with it. This can reduce the moisture content of the separated light material and improve the convenience of subsequent processing of the light material. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0028] Figure 2 This is a three-dimensional structural diagram of the servo motor, sprocket one, sprocket two, and chain of the present invention.

[0029] Figure 3 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0030] Figure 4 This is a three-dimensional structural diagram showing the disassembled components of the present invention, including the separation box, water collection tank, water pump, axial flow water pump, return water pipe, hydraulic push rod, and limiting plate.

[0031] Figure 5 This is a schematic diagram of the split three-dimensional structure of the lightweight separation mechanism of the present invention.

[0032] Figure 6 This is a schematic diagram of the split three-dimensional structure of the heavy mass separation mechanism of the present invention.

[0033] Figure 7 This is a three-dimensional structural diagram of the extrusion mechanism of the present invention.

[0034] Figure 8 This is a three-dimensional structural diagram of the jet frame of the present invention.

[0035] In the attached diagram, the following are the reference numerals: 1-support frame, 2-separation box, 3-collection pool, 4-water pump, 5-axial flow pump, 6-return pipe, 7-hydraulic push rod one, 71-limiting plate, 81-drive shaft, 82-driven shaft, 83-conveyor belt, 84-water baffle one, 85-water baffle two, 86-blocking frame, 87-servo motor, 88-sprocket one, 89-sprocket two, 810-chain, 811-protective shell, 91-hydraulic push rod two, 92-receiving frame, 93-connecting frame, 94-sliding frame, 95-sleeve, 96-reset spring, 97-draining plate, 98-contact frame, 101-rotating frame, 102-transmission assembly, 103-lowering frame, 104-connecting rod, 105-roller, 106-pressure plate, 11-air jet frame, 12-scraping frame. Detailed Implementation

[0036] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] Example 1: A water flotation separation device for lightweight materials in construction waste, such as... Figures 1-6 As shown, it includes a support frame 1;

[0038] The separation box 2 is fixed to the upper part of the support frame 1, and the bottom and upper side of the separation box 2 are both opened with water outlets;

[0039] A water collection tank 3 is fixed to the lower part of the support frame 1, and the water collection tank 3 is provided with an inclined surface;

[0040] Two water pumps 4 are fixed to the lower part of the support frame 1. The two water pumps 4 are symmetrically arranged and connected to the water collection tank 3.

[0041] Two axial flow water pumps 5 are fixed to one side of the separation tank 2. The two axial flow water pumps 5 are symmetrically arranged and connected to the separation tank 2. The axial flow water pumps 5 are used to generate impact water flow.

[0042] Two return water pipes 6 are fixed to the support frame 1. The upper end of the return water pipe 6 is fixed to the inlet of the axial flow pump 5, and the lower end of the return water pipe 6 is fixed to the outlet of the pump 4. The pump 4 pumps the water in the collection tank 3 back into the separation box 2 through the return water pipe 6 and the pump 4.

[0043] Two hydraulic push rods 7 are installed on the upper part of the support frame 1;

[0044] A limiting plate 71 is fixed between two hydraulic push rods 7 telescopic rods. The limiting plate 71 is slidably connected to the separation box 2 and covers the water outlet on the upper side of the separation box 2. The hydraulic push rod 7 controls the opening and closing of the water outlet on the upper side of the separation box 2 by controlling the lifting and lowering of the limiting plate 71.

[0045] The lightweight separation mechanism is installed on the support frame 1 and the separation box 2, and the lightweight separation mechanism is used to separate the lightweight waste that has been floated out.

[0046] The heavy waste separation mechanism is installed on the support frame 1 and is used to separate heavy waste.

[0047] A water level line is engraved at the water outlet on one side of the upper part of the separation tank 2.

[0048] The lightweight separation mechanism includes a drive shaft 81 connected to the upper part of the support frame 1 via bearings, a driven shaft 82 connected to the upper part of the support frame 1 via bearings, a conveyor belt 83 disposed between the drive shaft 81 and the driven shaft 82, the conveyor belt 83 being used to drain and transport the separated lightweight materials, a first water-separating plate 84 fixed to the upper part of the inner wall of the support frame 1, the first water-separating plate 84 being fixed to the separation box 2, a second water-separating plate 85 fixed to the upper part of the inner wall of the support frame 1, the conveyor belt 83 passing through the first water-separating plate 84 and the second water-separating plate 85, the first water-separating plate 84 and the second water-separating plate 85 being used to limit and guide the water drained from the conveyor belt 83, two blocking frames 86 fixed between the support frame 1 and the first water-separating plate 84, the bottom of the blocking frame 86 contacting the top of the conveyor belt 83, the blocking frame 86 being used to prevent impurities from falling into the water collection tank 3 from the gap between the conveyor belt 83 and the support frame 1, and a drive assembly disposed between the support frame 1 and the drive shaft 81.

[0049] The drive assembly includes a servo motor 87 fixed to the support frame 1, a first sprocket 88 fixed to the output shaft of the servo motor 87, a second sprocket 89 fixed to the drive shaft 81, and a protective shell 811 fixed to the support frame 1 and disposed between the first sprocket 88 and the second sprocket 89. The protective shell 811 covers the first sprocket 88, the second sprocket 89 and the chain 810. The servo motor 87 drives the second sprocket 89 to rotate through the first sprocket 88 and the chain 810, thereby driving the drive shaft 81 to rotate.

[0050] The heavy-duty separation mechanism includes two sets of hydraulic push rods 91 fixed to the support frame 1, with two hydraulic push rods 91 in each set and the two hydraulic push rods 91 in the same set being symmetrically arranged; two receiving frames 92 slidably connected to the support frame 1; a connecting frame 93 fixed to the receiving frame 92; the connecting frame 93 being fixed to the telescopic rod of the hydraulic push rod 91; the hydraulic push rod 91 drives the connecting frame 93 to move, thereby driving the receiving frame 92 to move; and an opening and closing assembly provided on the support frame 1 and the receiving frame 92.

[0051] The opening and closing assembly includes a sliding frame 94 slidably connected to the receiving frame 92, a sleeve 95 fixedly connected to the receiving frame 92, a return spring 96 disposed between the sliding frame 94 and the sleeve 95, the sleeve 95 being used to place impurities to jam the return spring 96, a drain plate 97 slidably connected to the receiving frame 92, the drain plate 97 being used to separate heavy materials and water, the drain plate 97 being fixedly connected to the sliding frame 94, and a contact frame 98 disposed on one side of the support frame 1, the sliding frame 94 and the contact frame 98 being in contact.

[0052] Initially, the limiting plate 71 covers the water outlet on one side of the upper part of the separation tank 2. The operator injects water into the separation tank 2, controlling the water flow rate to be greater than the outflow rate from the bottom outlet of the separation tank 2. The water flowing out from the bottom of the separation tank 2 falls into the collection tank 3. Once the water level in the collection tank 3 is higher than the pumping pipe of the pumping pump 4, the operator turns on the pumping pump 4 to draw water from the collection tank 3 and send it upwards through the return pipe 6 to the axial flow pump 5. The axial flow pump 5 then returns the water to the separation tank 2, forming a water circulation. When the water level in the separation tank 2 approaches the water level line at its upper outlet, the operator controls the extension rod of the hydraulic push rod 7 to extend, moving the limiting plate 71 upwards. The limiting plate 71 no longer covers the water outlet on one side of the upper part of the separation tank 2. Water will flow from the outlet. At this time, the staff increases the water flow rate to keep the water level in the separation tank 2 close to the water level line at the top outlet. When the water level in the separation tank 2 stabilizes, the staff stops adding water and adds construction waste into the separation tank 2. After the construction waste enters the water, under the action of gravity, the heavy materials will sink and be discharged through the water outlet at the bottom of the separation tank 2. Under the action of buoyancy, the light materials will float on the surface of the water. The axial flow pump 5 generates an impact water flow to push the light materials floating on the surface of the water towards the water outlet at the top of the separation tank 2 for discharge. Through the above operation, the light and heavy materials in the construction waste can be quickly separated. After the separation begins, the staff starts the servo motor 87 to rotate and controls the two sets of hydraulic push rods 91 to alternate. As the separation chamber expands and contracts, the output shaft of the servo motor 87 rotates, driving the drive shaft 81 to rotate. The drive shaft 81 then drives the conveyor belt 83 and the driven shaft 82 to rotate. Light materials and water discharged from the upper outlet of the separation chamber 2 will splash onto the conveyor belt 83. The water will leak through the mesh on the conveyor belt 83 and fall into the collection pool 3 below. Light materials will move with the conveyor belt 83 to one side of the driven shaft 82 and eventually fall down due to gravity. Heavy materials and water discharged from the bottom outlet of the separation chamber 2 will fall into the receiving frame 92. The drain plate 97 will filter out the water. After the upper receiving frame 92 has been receiving the materials for a period of time, the telescopic rod of the uppermost set of hydraulic push rods 91 will extend and drive the uppermost receiving frame 92, sliding frame 94, sleeve 95, return spring 96 and drain plate 97 to move through the connecting frame 93. After a period of movement, the upper receiving frame 92 is no longer located below the bottom outlet of the separator 2 and above the collection tank 3. At this time, the sliding frame 94 contacts the contact frame 98, and the telescopic rod of the upper set of hydraulic push rods 91 continues to extend, driving the upper connecting frame 93, receiving frame 92, and sleeve 95 to continue moving. The contact frame 98 limits the sliding frame 94, causing the sliding frame 94 and the drain plate 97 to have relative displacement with the receiving frame 92. The return spring 96 is compressed, exposing the discharge port at the bottom of the receiving frame 92. Under the action of gravity, the heavy material in the upper receiving frame 92 will fall out to discharge the object in the receiving frame 92. When the upper receiving frame 92 is emptied, the lower receiving frame 92 takes over the function of receiving the heavy material.After the upper receiving frame 92 is emptied, the telescopic rod of the upper set of hydraulic push rods 91 retracts and drives the upper receiving frame 92 and sleeve 95 to move in the opposite direction through the connecting frame 93. The return spring 96 rebounds and drives the sliding frame 94 and the drain plate 97 to reset. The drain plate 97 covers the discharge port at the bottom of the receiving frame 92 again. After the upper receiving frame 92 is emptied and reset, the operator repeats the above operation to empty the lower receiving frame 92 as well. The two work alternately to achieve continuous separation of heavy materials. Compared with the traditional water immersion flotation device, this device adopts a separation structure that is not immersed in water. The water separator 84 and The baffle plate 85 limits and guides the water discharged from the upper outlet of the separation tank 2, preventing a large amount of water and impurities from contacting the drive shaft 81 and driven shaft 82. Water and heavy objects discharged from the bottom outlet of the separation tank 2 are directly filtered and discharged through the drain plate 97. This operation reduces the probability of water and impurities contacting other components, increases the service life of each component in the separation structure, and thus extends the working life of the equipment. After separation, the operator turns off the water pump 4 and the axial flow pump 5. After the water in the separation tank 2 is drained, the hydraulic push rod 7 is retracted to reset the limit plate 71, facilitating the next operation.

[0053] Example 2: Based on Example 1, such as Figures 1-3 and Figure 7 As shown, it also includes a compression mechanism disposed between the support frame 1 and the driven shaft 82. The compression mechanism is used to compress the separated lightweight waste. The compression mechanism includes two rotating frames 101 rotatably connected to the upper part of the support frame 1, the two rotating frames 101 being symmetrically arranged; two sets of transmission components 102 disposed between the driven shaft 82 and the two rotating frames 101; a lower pressure frame 103 slidably connected to the upper part of the support frame 1; and two connecting rods 1 hinged to the lower pressure frame 103. 04. Two connecting rods 104 are respectively hinged to two rotating frames 101. Several rollers 105 are rotatably connected to the bottom of the lower pressure frame 103. The rollers 105 are evenly spaced. The driven shaft 82 drives the rotating frame 101 to rotate through the transmission assembly 102, and then drives the lower pressure frame 103 and rollers 105 to move up and down through the connecting rods 104 to compress the light material. The pressure plate 106 is fixed to the upper part of the inner wall of the support frame 1. The pressure plate 106 is located below the rollers 105.

[0054] The transmission assembly 102 includes a drive wheel fixed to the driven shaft 82, a driven wheel fixed to the rotating frame 101, and a transmission belt wound between the drive wheel and the driven wheel.

[0055] Initially, the lower pressure frame 103 and roller 105 are located above the conveyor belt 83. After the operation begins, the driven shaft 82 rotates, driving the rotating frame 101 to rotate via the transmission assembly 102. The rotating frame 101 rotates, pulling the lower pressure frame 103 downward via the connecting rod 104. The downward movement of the lower pressure frame 103 drives the roller 105 to move downward. The roller 105 moves downward and contacts the light material on the conveyor belt 83, squeezing the contacted light material. Through the above operation, the moisture content of the separated light material can be reduced, improving the convenience of subsequent processing of the light material. The rotating frame 101 continues to rotate, driving the lower pressure frame 103 and roller 105 to move up and down reciprocally via the connecting rod 104 to facilitate continuous squeezing. The pressure plate 106 is located below the contact area between the conveyor belt 83 and the roller 105. When the roller 105 contacts the conveyor belt 83, the pressure plate 106 supports the conveyor belt 83, preventing the conveyor belt 83 from being subjected to excessive pressure and affecting its normal operation.

[0056] Example 3: Based on Example 2, such as Figure 3 and Figure 8 As shown, it also includes an air jet frame 11 bolted to one side of the support frame 1, which is used to clean the holes in the drain plate 97.

[0057] It also includes a scraper 12 fixed to the upper part of the inner wall of the support frame 1. The scraper 12 is in contact with one side of the conveyor belt 83 and is used to scrape off light substances adhering to the conveyor belt 83.

[0058] Before work begins, the staff connects the air inlet of the jet frame 11 to the air supply equipment through the air supply pipe. After work begins, the staff continuously supplies air to the jet frame 11. When the drain plate 97 moves to the bottom of the jet frame 11, the air nozzle of the jet frame 11 sprays gas to clean the holes of the drain plate 97 to ensure the water filtration efficiency of the drain plate 97.

[0059] When the conveyor belt 83 rotates, the scraper 12 scrapes off the light substances that are stuck to the conveyor belt 83 and cannot fall off by gravity, preventing too much residue on the conveyor belt 83 from affecting normal operation.

[0060] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A water flotation separation device for lightweight materials in construction waste, characterized in that: Including, support frame (1); The separation box (2) is fixed to the upper part of the support frame (1), and the bottom and upper side of the separation box (2) are both opened with water outlets; Water collection tank (3) fixed to the lower part of the support frame (1); Two water pumps (4) are fixed to the lower part of the support frame (1); Two axial flow water pumps (5) are fixed to one side of the separation box (2); Two return water pipes (6) are fixed to the support frame (1). The upper end of the return water pipe (6) is fixed to the inlet of the axial flow pump (5), and the lower end of the return water pipe (6) is fixed to the outlet of the pump (4). Two hydraulic push rods (7) are installed on the upper part of the support frame (1); A limiting plate (71) is fixed between two hydraulic push rods (7) and a telescopic rod, and the limiting plate (71) is slidably connected to the separation box (2); A lightweight separation mechanism is installed on the support frame (1) and the separation box (2); The heavy separation mechanism is installed on the support frame (1).

2. The water flotation separation device for lightweight materials in construction waste as described in claim 1, characterized in that: The water level line is engraved at the outlet on one side of the upper part of the separation box (2).

3. The water flotation separation device for lightweight materials in construction waste as described in claim 1, characterized in that: The lightweight separation mechanism includes a drive shaft (81) rotatably connected to the upper part of the support frame (1), a driven shaft (82) rotatably connected to the upper part of the support frame (1), a conveyor belt (83) disposed between the drive shaft (81) and the driven shaft (82), a first water baffle plate (84) fixed to the upper part of the inner wall of the support frame (1), the first water baffle plate (84) being fixed to the separation box (2), a second water baffle plate (85) fixed to the upper part of the inner wall of the support frame (1), two baffle frames (86) fixed between the support frame (1) and the first water baffle plate (84), and a drive assembly disposed between the support frame (1) and the drive shaft (81).

4. The water flotation separation device for lightweight materials in construction waste as described in claim 3, characterized in that: The drive assembly includes a servo motor (87) fixed to the support frame (1), a first sprocket (88) fixed to the output shaft of the servo motor (87), a second sprocket (89) fixed to the drive shaft (81), a chain (810) disposed between the first sprocket (88) and the second sprocket (89), and a protective shell (811) fixed to the support frame (1), the protective shell (811) covering the first sprocket (88), the second sprocket (89) and the chain (810).

5. The water flotation separation device for lightweight materials in construction waste as described in claim 4, characterized in that: The heavy-weight separation mechanism includes two sets of hydraulic push rods (91) fixed to the support frame (1), two receiving frames (92) slidably connected to the support frame (1), a connecting frame (93) fixed to the receiving frame (92), the connecting frame (93) being fixed to the telescopic rod of the hydraulic push rod (91), and an opening and closing assembly set on the support frame (1) and the receiving frame (92).

6. The water flotation separation device for lightweight materials in construction waste as described in claim 5, characterized in that: The opening and closing assembly includes a sliding frame (94) slidably connected to the receiving frame (92), a sleeve (95) fixedly connected to the receiving frame (92), a return spring (96) disposed between the sliding frame (94) and the sleeve (95), a drain plate (97) slidably connected to the receiving frame (92), the drain plate (97) being fixedly connected to the sliding frame (94), and a contact frame (98) disposed on one side of the support frame (1), the sliding frame (94) and the contact frame (98) being in contact.

7. The water flotation separation device for lightweight materials in construction waste as described in claim 6, characterized in that: It also includes a pressing mechanism disposed between the support frame (1) and the driven shaft (82). The pressing mechanism includes two rotating frames (101) rotatably connected to the upper part of the support frame (1), two sets of transmission components (102) disposed between the driven shaft (82) and the two rotating frames (101), a lower pressing frame (103) slidably connected to the upper part of the support frame (1), two connecting rods (104) hinged to the lower pressing frame (103), the two connecting rods (104) being respectively hinged to the two rotating frames (101), a number of rollers (105) rotatably connected to the lower part of the lower pressing frame (103), and a pressure plate (106) fixed to the upper part of the inner wall of the support frame (1).

8. The water flotation separation device for lightweight materials in construction waste as described in claim 7, characterized in that: The transmission assembly (102) includes a drive wheel fixed to the driven shaft (82), a driven wheel fixed to the rotating frame (101), and a transmission belt wound between the drive wheel and the driven wheel.

9. The water flotation separation device for lightweight materials in construction waste as described in claim 8, characterized in that: It also includes a jet frame (11) fixed to one side of the support frame (1).

10. The water flotation separation device for lightweight materials in construction waste as described in claim 9, characterized in that: It also includes a scraper (12) fixed to the upper part of the inner wall of the support frame (1), and the scraper (12) is in contact with one side of the conveyor belt (83).

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