Multi-stage treatment device for industrial wastewater

Abstract

The invention relates to an industrial wastewater treatment device, in particular to a multistage treatment device for industrial wastewater. Comprising a box body, a partition plate, a water inlet pipe, a coarse screen, a fine screen, a water diversion plate and a stirring device, the box body is sequentially composed of a primary treatment frame, an intermediate treatment frame and an advanced treatment frame from left to right, the top end of the primary treatment frame is connected with the water inlet pipe, and the coarse screen is rotationally connected to the inner left wall of the primary treatment frame; the middle of the primary treatment frame is slidably connected with a fine screen, water diversion plates are sequentially arranged on the left inner wall and the right inner wall of the interior of the intermediate treatment frame from top to bottom at intervals, stirring devices are sequentially arranged on the intermediate treatment frame from top to bottom at intervals, and partition plates are arranged between the primary treatment frame and the intermediate treatment frame and between the intermediate treatment frame and the advanced treatment frame. According to the invention, the water diversion plate which is inclined upwards is arranged in the intermediate treatment frame to form a Z-shaped channel, so that the mixing time of a flocculating agent and wastewater is prolonged, and the flocculating agent can fully react with pollutants in the wastewater.

Description

Technical Field

[0001] The present invention relates to an industrial wastewater treatment device, and particularly to a multi-stage treatment device for industrial wastewater. Background Art

[0002] Industrial wastewater refers to the wastewater containing various pollutants generated during industrial production processes. Its composition is complex and usually includes harmful substances such as organic matter, suspended solids, heavy metals, and grease. With the rapid development of industrialization, the discharge of industrial wastewater has increased year by year, posing a serious threat to the environment and human health.

[0003] At present, although the existing multi-stage treatment devices for industrial wastewater can purify the wastewater to a certain extent, there are still many deficiencies. For example, in the flocculation precipitation process, the mixing time of the flocculant and the wastewater is too short, resulting in the flocculant being unable to fully react with the pollutants in the wastewater, unstable treatment effects, and large fluctuations in the effluent water quality. Summary of the Invention

[0004] In order to overcome the drawback that in the above technical background, when the existing multi-stage treatment device for industrial wastewater treats wastewater, the mixing time of the flocculant and the wastewater is too short, resulting in unstable treatment effects, the object of the present invention is to provide a multi-stage treatment device for industrial wastewater.

[0005] The technical solution of the present invention is as follows: A multi-stage treatment device for industrial wastewater includes a box body, a partition board, a water delivery pipe, a water inlet pipe, a coarse screen, a fine screen, a fan group, a water diversion board, a stirring device, and a drain pipe. The box body is sequentially composed of a primary treatment frame, an intermediate treatment frame, and a high-level treatment frame from left to right. The top of the primary treatment frame is connected with a water inlet pipe. The left inner wall of the primary treatment frame is rotatably connected with a coarse screen. The middle part of the primary treatment frame is slidably connected with a fine screen. The water diversion boards are sequentially arranged at intervals on the upper and lower left and right inner walls of the intermediate treatment frame from top to bottom. The water diversion boards are all in an upward inclined state. One end of each water diversion board is fixedly connected to the inner wall of the intermediate treatment frame, and an opening is formed between the other end of each water diversion board and the inner wall of the intermediate treatment frame. A fan group is arranged on the inner wall of the intermediate treatment frame at the opening. Stirring devices are sequentially arranged at intervals from top to bottom in the intermediate treatment frame. Partition boards are arranged between the primary treatment frame and the intermediate treatment frame, and between the intermediate treatment frame and the high-level treatment frame. A rectangular through hole is opened at the lower end of the left partition board. Multiple water delivery pipes are arranged on the upper part of the right partition board. The lower right end of the high-level treatment frame is connected with a drain pipe.

[0006] As a preferred technical solution of the present invention, the stirring device includes a stirring motor and a stirring rotating rod. Stirring motors are sequentially arranged at intervals from top to bottom at the front end of the intermediate treatment frame. Stirring rotating rods are sequentially arranged at intervals from top to bottom and rotatably connected inside the intermediate treatment frame. The stirring rotating rods are connected to the output shafts of the stirring motors, and the stirring rotating rods are all located between the upper and lower water diversion boards.

[0007] As a preferred technical solution of the present invention, it further includes a flocculation device, which includes a flocculant barrel, a connecting pipe, a feeding screw, and a feeding motor. A connecting pipe is installed at the lower part of the front end of the intermediate treatment frame. The top end of the connecting pipe is connected to the flocculant barrel. A feeding screw is rotatably connected inside the connecting pipe. The front end of the connecting pipe is connected to the feeding motor, and the output shaft of the feeding motor is connected to the feeding screw.

[0008] As a preferred technical solution of the present invention, it further includes a floating foam removing device, which includes a rotating motor, a pulley transmission member, a reciprocating screw, a guide rod, a connecting frame, a floating foam scraper, a second elastic member, and an inclined block. Rotating motors are provided at both the front and rear ends of the box body. A reciprocating screw is rotatably connected to the upper part inside the intermediate treatment frame. The reciprocating screw is driven by the pulley transmission member with the rotating motor. A connecting frame is threadedly connected to the reciprocating screw. A floating foam scraper is slidably connected inside the connecting frame. Multiple second elastic members are connected between the floating foam scraper and the connecting frame. Inclined blocks are symmetrically arranged on the left and right on the inner front wall and the inner rear wall of the intermediate treatment frame. Guide rods are symmetrically arranged on the left and right at the upper part inside the intermediate treatment frame, and both guide rods are slidably connected to the connecting frame.

[0009] As a preferred technical solution of the present invention, it further includes a floating foam collection frame. Floating foam collection frames are installed at both the front and rear ends of the intermediate treatment frame. The top end of the floating foam collection frame is flush with the top end of the intermediate treatment frame. The lower part of the floating foam scraper is a trapezoidal long plate, and the floating foam scraper can slide on the inclined block.

[0010] As a preferred technical solution of the present invention, it further includes a first elastic member, a wedge-shaped block, and a cam. First elastic members are installed at the connection parts between the coarse screen and the box body. Wedge-shaped blocks are provided on both the front and rear sides of the bottom end of the coarse screen. Cams are rotatably connected to the inner front wall and the inner rear wall of the primary treatment frame respectively. The cams are in contact with the wedge-shaped blocks, and the cams on the front and rear sides are respectively connected to the output shafts of the rotating motors on the front and rear sides.

[0011] As a preferred technical solution of the present invention, it further includes an impurity collection frame, a collection mesh bag, and a handle. An impurity discharge port is opened at the upper part of the front end of the primary treatment frame. An impurity collection frame is installed at the impurity discharge port at the front end of the primary treatment frame. A collection mesh bag is slidably connected inside the impurity collection frame, and handles are symmetrically arranged at the front and rear of the top end of the collection mesh bag.

[0012] As a preferred technical solution of the present invention, it further includes a biological membrane filter screen and a foot support. Multiple biological membrane filter screens are spaced inside the advanced treatment frame. The biological membrane filter screen is of a pull-out type. Foot supports are connected to the four corners of the bottom end of the box body.

[0013] As a preferred technical solution of the present invention, pull handles are installed on the fine screen, the floating foam collection frame, and the biological membrane filter screen. A fan group consists of multiple fans spaced from front to back.

[0014] The present invention has the following advantages: 1. By arranging an upwardly inclined water diversion plate in the intermediate treatment box to form a Z-shaped channel, the mixing time of the flocculant and the wastewater is prolonged, enabling the flocculant to fully react with the pollutants in the wastewater, and improving the flocculation effect and the stability of the effluent water quality.

[0015] 2. Through the coordinated action of the rotary motor, reciprocating screw, and foam scraping plate, the foam removal device automatically scrapes the foam on the surface of the wastewater and collects it into the foam collection box, reducing manual intervention and improving the treatment efficiency.

[0016] 3. The pull-out biological membrane filter screen in the advanced treatment box further removes the organic matter and suspended solids in the wastewater, and the microorganisms attached to its surface can efficiently degrade the pollutants, ensuring that the effluent water quality meets the standards stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the partition and other components of the present invention.

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the water diversion plate and other components of the present invention.

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the flocculant barrel and other components of the present invention.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the biological membrane filter screen and other components of the present invention.

[0022] Figure 6 It is a three-dimensional structural schematic diagram of the coarse screen and other components of the present invention.

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the foam scraping plate and other components of the present invention.

[0024] Figure 8 It is a three-dimensional structural schematic diagram of the collection mesh bag and other components of the present invention.

[0025] In the attached drawing reference numerals: 1: box body; 101: primary treatment frame; 102: intermediate treatment frame; 103: advanced treatment frame; 104: partition board; 105: water delivery pipeline; 106: impurity discharge port; 2: foot support; 3: water inlet pipe; 4: coarse screen; 401: first elastic member; 402: wedge-shaped block; 403: cam; 5: impurity collection box; 501: collection mesh bag; 502: handle; 6: fine screen; 7: flocculation device; 701: flocculant barrel; 702: connecting pipe; 703: feeding screw; 704: feeding motor; 8: fan group; 9: water diversion plate; 10: stirring device; 1001: stirring motor; 1002: stirring rotating rod; 11: foam removal device; 1101: rotating motor; 1102: belt pulley transmission member; 1103: reciprocating screw; 1104: guide rod; 1105: connecting frame; 1106: foam scraping plate; 1107: second elastic member; 1108: inclined block; 1109: foam collection box; 12: drain pipe; 13: biofilm filter screen. Detailed implementation manners

[0026] The present invention will be further described in detail below in conjunction with the attached drawings and specific implementation manners, but the protection scope and application scope of the present invention are not limited.

[0027] A multi-stage treatment device for industrial wastewater, as Figures 1-8As shown in the figure, it includes a box body 1, a partition 104, a water delivery pipe 105, a water inlet pipe 3, a coarse screen 4, a fine screen 6, a fan group 8, a water diversion plate 9, a stirring device 10, and a drain pipe 12. The box body 1 is composed of a primary treatment frame 101, a secondary treatment frame 102, and a tertiary treatment frame 103 from left to right in sequence. The top of the primary treatment frame 101 is connected to the water inlet pipe 3, and industrial wastewater enters the device through the water inlet pipe 3. The left inner wall of the primary treatment frame 101 is rotatably connected with a coarse screen 4, and the coarse screen 4 is used to intercept large particle impurities in the wastewater. The middle part of the primary treatment frame 101 is slidably connected with a fine screen 6, and the fine screen 6 is used to further filter smaller impurities in the wastewater. Inside the secondary treatment frame 102, water diversion plates 9 are sequentially arranged at intervals on the left and right inner walls from top to bottom. The water diversion plates 9 are all in an upward inclined state. This upward inclined state of the water diversion plates 9 is conducive to the flow of wastewater. One end of each water diversion plate 9 is fixedly connected to the inner wall of the secondary treatment frame 102, and an opening is formed between the other end of each water diversion plate 9 and the inner wall of the secondary treatment frame 102. The water diversion plates 9 make a Z-shaped channel formed inside the secondary treatment frame 102, and the wastewater needs to pass through the Z-shaped channel to reach the upper part of the secondary treatment frame 102, which prolongs the mixing time of the wastewater and the flocculant and improves the flocculation effect. Fan groups 8 are arranged on the inner walls of the secondary treatment frame 102 at the openings, and the fan groups 8 are used to guide the wastewater to flow upward along the Z-shaped channel. Stirring devices 10 are sequentially arranged at intervals from top to bottom in the secondary treatment frame 102. Partition plates 104 are provided between the primary treatment frame 101 and the secondary treatment frame 102, and between the secondary treatment frame 102 and the tertiary treatment frame 103. A rectangular through hole is opened at the lower end of the left partition plate 104, and the wastewater enters the secondary treatment frame 102 through this rectangular through hole. Multiple water delivery pipes 105 are provided on the upper part of the right partition plate 104, and the wastewater in the secondary treatment frame 102 enters the tertiary treatment frame 103 through the water delivery pipes 105. The lower right end of the tertiary treatment frame 103 is connected to a drain pipe 12, and the drain pipe 12 is used to discharge the wastewater after multi-stage treatment.

[0028] As Figure 2 and Figure 5 shown in the figure, the stirring device 10 includes a stirring motor 1001 and a stirring rod 1002. Stirring motors 1001 are sequentially arranged at intervals from top to bottom at the front end of the secondary treatment frame 102. Stirring rods 1002 are sequentially arranged at intervals and rotatably connected inside the secondary treatment frame 102 from top to bottom. The stirring rods 1002 are connected to the output shafts of the stirring motors 1001. The stirring rods 1002 are all located between the upper and lower water diversion plates 9. The stirring motors 1001 drive the stirring rods 1002 to rotate, agitating the wastewater to fully mix the flocculant and the wastewater and promoting the formation of flocs.

[0029] As Figure 1 , Figure 2 and Figure 4As shown, it further includes a flocculation device 7. The flocculation device 7 is used to add a flocculant to the wastewater to promote the aggregation of pollutants in the wastewater. The flocculation device 7 includes a flocculant barrel 701, a connecting pipe 702, a feeding screw 703, and a feeding motor 704. The lower part of the front end of the intermediate treatment frame 102 is provided with a connecting pipe 702. The top end of the connecting pipe 702 is connected to a flocculant barrel 701. The inside of the connecting pipe 702 is rotatably connected with a feeding screw 703. The front end of the connecting pipe 702 is connected to a feeding motor 704. The output shaft of the feeding motor 704 is connected to the feeding screw 703. The feeding motor 704 drives the feeding screw 703 to rotate. Under the action of gravity, the flocculant flows out of the flocculant barrel 701 and falls into the gap between the feeding screw 703 and the connecting pipe 702. The rotating feeding screw 703 adds the flocculant to the wastewater.

[0030] As Figure 1 , Figure 2 and Figure 6 shown, it further includes a floating foam removal device 11. The floating foam removal device 11 is used to automatically scrape the floating foam on the surface of the wastewater. The floating foam removal device 11 includes a rotating motor 1101, a pulley transmission member 1102, a reciprocating screw 1103, a guide rod 1104, a connecting frame 1105, a floating foam scraper 1106, a second elastic member 1107, and an inclined block 1108. Rotating motors 1101 are provided at both the front and rear ends of the box body 1. The upper part inside the intermediate treatment frame 102 is rotatably connected with a reciprocating screw 1103. The reciprocating screw 1103 is driven by the pulley transmission member 1102 between the reciprocating screw 1103 and the rotating motor 1101. A connecting frame 1105 is threadedly connected to the reciprocating screw 1103. A floating foam scraper 1106 is slidably connected inside the connecting frame 1105. A plurality of second elastic members 1107 are connected between the floating foam scraper 1106 and the connecting frame 1105. Inclined blocks 1108 are symmetrically arranged on the left and right on the inner front wall and the inner rear wall of the intermediate treatment frame 102. Guide rods 1104 are symmetrically arranged on the left and right at the upper part inside the intermediate treatment frame 102. Both guide rods 1104 are slidably connected to the connecting frame 1105. The rotating motor 1101 drives the reciprocating screw 1103 to rotate through the pulley transmission member 1102. The reciprocating screw 1103 drives the connecting frame 1105 to move back and forth on the guide rods 1104. The floating foam scraper 1106 inside the connecting frame 1105 scrapes the floating foam to both sides.

[0031] As Figure 1 and Figure 6 shown, it further includes a floating foam collection frame 1109. The floating foam collection frames 1109 are installed at both the front and rear ends of the intermediate treatment frame 102. The top end of the floating foam collection frame 1109 is flush with the top end of the intermediate treatment frame 102. The lower part of the floating foam scraper 1106 is a trapezoidal long plate. The floating foam collection frame 1109 is used to collect the floating foam scraped by the floating foam scraper 1106, facilitating the regular cleaning of the floating foam. The floating foam scraper 1106 can slide on the inclined block 1108.

[0032] As Figure 6 and Figure 8 shown, it further includes a first elastic member 401, a wedge block 402, and a cam 403. First elastic members 401 are installed at the connections between the coarse screen 4 and the box body 1. Wedge blocks 402 are provided on the front and rear sides of the bottom end of the coarse screen 4. Cams 403 are rotatably connected to the inner front wall and the inner rear wall of the primary treatment frame 101. The cams 403 are in contact with the wedge blocks 402. The cams 403 on the front and rear sides are respectively connected to the output shafts of the rotary motors 1101 on the front and rear sides. When the rotary motors 1101 are started, the rotary motors 1101 drive the cams 403 to rotate. When the contact point between the cam 403 and the wedge block 402 gradually becomes the eccentric end of the cam 403, the cam 403 will push the coarse screen 4 to rotate upward with the left end as the center through the wedge block 402. During the upward rotation of the coarse screen 4, the first elastic member 401 will gradually change from the initial state to the compressed state. When the contact point between the cam 403 and the wedge block 402 gradually changes from the eccentric end of the cam 403 to the centric end of the cam 403, the first elastic member 401 gradually returns to its original position. The first elastic member 401 causes the coarse screen 4 to rotate downward back to the initial position. During this process, the large impurities on the coarse screen 4 are shaken off and approach the impurity discharge port 106 on the left side.

[0033] As Figure 1 and Figure 8 shown, it further includes an impurity collection frame 5, a collection mesh bag 501, and a handle 502. An impurity discharge port 106 is opened at the upper part of the front end of the primary treatment frame 101. An impurity collection frame 5 is installed at the impurity discharge port 106 at the front end of the primary treatment frame 101. A collection mesh bag 501 is slidably connected in the impurity collection frame 5. The collection mesh bag 501 is made of cotton cloth to prevent impurities from passing through the collection mesh bag 501 and falling back into the primary treatment frame 101. Handles 502 are symmetrically arranged at the front and rear of the top end of the collection mesh bag 501. When the impurities on the coarse screen 4 fall into the collection mesh bag 501 in the collection frame, when a certain amount of impurities are collected in the collection mesh bag 501, the handle 502 on the collection mesh bag 501 can be held to lift the collection mesh bag 501, and the impurities in the collection mesh bag 501 can be cleaned up.

[0034] As Figure 1 and Figure 5 shown, it further includes a biofilm filter screen 13 and foot supports 2. Multiple biofilm filter screens 13 are arranged at intervals in the advanced treatment frame 103. The biofilm filter screens 13 are of a pull-out type. When the biofilm filter screens 13 need to be replaced, the biofilm filter screens 13 can be pulled out and new biofilm filter screens 13 can be replaced to quickly replace the biofilm filter screens 13. Foot supports 2 are connected to the four corners of the bottom end of the box body 1, and the foot supports 2 are used to support the box body 1.

[0035] As Figures 1-5As shown, pull handles are installed on the fine screen 6, the foam collection frame 1109, and the biofilm filter screen 13. When the fine screen 6 needs to be cleaned, pull the pull handle at the left end of the fine screen 6 to pull out the fine screen 6, and then clean the fine screen 6. A fan group 8 consists of multiple fans arranged at intervals from front to back.

[0036] After the wastewater enters the primary treatment frame 101 through the water inlet pipe 3, the large particulate suspended matters are intercepted by the coarse screen 4. The wastewater passing through the coarse screen 4 then falls to the fine screen 6. The fine screen 6 further filters the wastewater to filter out smaller impurities. The wastewater passes through the fine screen 6 and reaches the lower inner part of the primary treatment frame 101. Then the wastewater flows into the intermediate treatment frame 102 through the rectangular through-hole at the lower part of the left partition 104. Start the feeding motor 704. The feeding motor 704 drives the feeding screw 703 to rotate, and the flocculant flowing out from the flocculant barrel 701 is added to the wastewater by the feeding screw 703. At the same time, start the stirring motor 1001. The stirring motor 1001 drives the stirring rod 1002 to stir the wastewater, so that the flocculant is fully mixed with the wastewater to form flocs. The solution of the flocculant and the wastewater will move upward along the Z-shaped channel formed by the water diversion plate 9. During the upward movement of this mixed solution, start the fan group 8. The fans in the fan group 8 will guide this mixed solution to move upward along the Z-shaped channel. The stirring rod 1002 stirs the solution to make a large number of tiny bubbles appear in the solution. These bubbles attach to the surface of the flocs and grease and make them float to form foam. The foam will gather on the surface of the mixed solution in the intermediate treatment frame 102. Start the rotating motor 1101. The rotating motor 1101 drives the reciprocating screw 1103 to rotate through the pulley transmission part 1102. The reciprocating screw 1103 drives the connecting frame 1105 to move back and forth on the guide rod 1104. The foam scraping plate 1106 in the connecting frame 1105 scrapes the foam to the foam collection frames 1109 on both sides. When the foam scraping plate 1106 abuts against the inclined block 1108, the foam scraping plate 1106 will move upward along the inclined block 1108. During this process, the second elastic member 1107 changes from the initial state to the compressed state, and the foam scraping plate 1106 scrapes the foam into the foam collection frame 1109. The treated wastewater flows into the advanced treatment frame 103 through the water delivery pipe ........

[0037] It should be noted that there seems to be an incomplete part in the translation of the content in . Please check and supplement it if necessary.Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-stage treatment device for industrial wastewater, comprising a box body (1), characterized in that: It also includes a partition board (104), a water conveyance pipeline (105), a water inlet pipe (3), a coarse screen (4), a fine screen (6), a fan group (8), a water diversion board (9), a stirring device (10), and a drain pipe (12). The box body (1) is sequentially composed of a primary treatment frame (101), an intermediate treatment frame (102), and a high-level treatment frame (103) from left to right. A water inlet pipe (3) is connected to the top end of the primary treatment frame (101). A coarse screen (4) is rotatably connected to the inner left wall of the primary treatment frame (101). A fine screen (6) is slidably connected to the middle part of the primary treatment frame (101). Water diversion boards (9) are sequentially arranged at intervals on the upper and lower left and right inner walls of the intermediate treatment frame (102) from top to bottom. The water diversion boards (9) are all in an upwardly inclined state. One end of each water diversion board (9) is fixedly connected to the inner wall of the intermediate treatment frame (102), and an opening is formed between the other end of each water diversion board (9) and the inner wall of the intermediate treatment frame (102). Fan groups (8) are arranged on the inner walls of the intermediate treatment frame (102) at the openings. Stirring devices (10) are sequentially arranged at intervals in the intermediate treatment frame (102) from top to bottom. Partition boards (104) are arranged between the primary treatment frame (101) and the intermediate treatment frame (102), and between the intermediate treatment frame (102) and the high-level treatment frame (103). A rectangular through hole is opened at the lower end of the left partition board (104). Multiple water conveyance pipelines (105) are arranged on the upper part of the right partition board (104). A drain pipe (12) is connected to the lower right end of the high-level treatment frame (103).

2. The multi-stage treatment device for industrial wastewater according to claim 1, characterized in that: The stirring device (10) includes a stirring motor (1001) and a stirring rotating rod (1002). Stirring motors (1001) are sequentially arranged at intervals on the front end of the intermediate treatment frame (102) from top to bottom. Stirring rotating rods (1002) are sequentially rotatably connected in the intermediate treatment frame (102) from top to bottom. The stirring rotating rods (1002) are connected to the output shafts of the stirring motors (1001). The stirring rotating rods (1002) are all located between the upper and lower water diversion boards (9).

3. The multi-stage treatment device for industrial wastewater according to claim 2, characterized in that: It also includes a flocculation device (7). The flocculation device (7) includes a flocculant barrel (701), a connecting pipe (702), a feeding screw (703), and a feeding motor (704). A connecting pipe (702) is installed at the lower part of the front end of the intermediate treatment frame (102). The top end of the connecting pipe (702) is connected to a flocculant barrel (701). A feeding screw (703) is rotatably connected inside the connecting pipe (702). A feeding motor (704) is connected to the front end of the connecting pipe (702). The output shaft of the feeding motor (704) is connected to the feeding screw (703).

4. A multi-stage treatment device for industrial wastewater according to claim 3, characterized in that: It further includes a floating foam removing device (11). The floating foam removing device (11) includes a rotary motor (1101), a pulley transmission member (1102), a reciprocating screw (1103), a guide rod (1104), a connecting frame (1105), a floating foam scraper (1106), a second elastic member (1107) and an inclined block (1108). Rotary motors (1101) are provided at both the front and rear ends of the box body (1). A reciprocating screw (1103) is rotatably connected to the upper inner part of the intermediate treatment frame (102). The reciprocating screw (1103) is driven by the pulley transmission member (1102) between the rotary motor (1101). A connecting frame (1105) is threadedly connected to the reciprocating screw (1103). A floating foam scraper (1106) is slidably connected within the connecting frame (1105). A plurality of second elastic members (1107) are connected between the floating foam scraper (1106) and the connecting frame (1105). Inclined blocks (1108) are symmetrically arranged left and right on both the inner front wall and the inner rear wall of the intermediate treatment frame (102). Guide rods (1104) are symmetrically arranged left and right at the upper part of the intermediate treatment frame (102). Both guide rods (1104) are slidably connected to the connecting frame (1105).

5. A multi-stage treatment device for industrial wastewater according to claim 4, characterized in that: It further includes a floating foam collection frame (1109). Floating foam collection frames (1109) are installed at both the front and rear ends of the intermediate treatment frame (102). The top ends of the floating foam collection frames (1109) are flush with the top end of the intermediate treatment frame (102). The lower part of the floating foam scraper (1106) is a trapezoidal long plate, and the floating foam scraper (1106) can slide on the inclined block (1108).

6. A multi-stage treatment device for industrial wastewater according to claim 5, characterized in that: It further includes a first elastic member (401), a wedge-shaped block (402) and a cam (403). First elastic members (401) are installed at the connection parts between the coarse screen (4) and the box body (1). Wedge-shaped blocks (402) are provided at both the front and rear sides of the bottom end of the coarse screen (4). Cams (403) are rotatably connected to both the inner front wall and the inner rear wall of the primary treatment frame (101). The cams (403) are in contact with the wedge-shaped blocks (402). The cams (403) on the front and rear sides are respectively connected to the output shafts of the rotary motors (1101) on the front and rear sides.

7. A multi-stage treatment device for industrial wastewater according to claim 6, characterized in that: It further includes an impurity collection frame (5), a collection mesh bag (501) and a handle (502). An impurity discharge port (106) is opened at the upper part of the front end of the primary treatment frame (101). An impurity collection frame (5) is installed at the impurity discharge port (106) at the front end of the primary treatment frame (101). A collection mesh bag (501) is slidably connected within the impurity collection frame (5). Handles (502) are symmetrically arranged at the front and rear of the top end of the collection mesh bag (501).

8. A multi-stage treatment device for industrial wastewater according to claim 7, characterized in that: It further includes a biological membrane filter screen (13) and foot supports (2). A plurality of biological membrane filter screens (13) are arranged at intervals within the advanced treatment frame (103). The biological membrane filter screens (13) are of a pull-out type. Foot supports (2) are connected to the four corners of the bottom end of the box body (1).

9. A multi-stage treatment device for industrial wastewater according to claim 8, characterized in that: Pull handles are installed on the fine screen (6), the floating foam collection frame (1109) and the biological membrane filter screen (13). A fan group (8) consists of a plurality of fans arranged at intervals from front to back.

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