Sewage treatment device for chemical production

Abstract

The invention relates to the technical field of chemical wastewater treatment, in particular to a sewage treatment device for chemical production, which comprises a sewage tank, a blow-off pipe is arranged at the front part of the sewage tank, a liquid inlet pipe is arranged at the rear part of the sewage tank, and notches are formed in the left side and the right side of the sewage tank; the device further comprises a first door, a first electric roller, an oil absorption belt, a guide plate, a second electric roller, a scraper and the like. A plurality of doors I are formed in the sewage tank; a plurality of electric rollers I are connected into the sewage tank; a plurality of electric rollers II are connected into the sewage tank; all the electric rollers I and all the electric rollers II are jointly wound with an oil absorption belt; a plurality of guide plates are fixedly connected into the sewage tank; and the right part of the upper side of each concave part is fixedly connected with a scraping plate. The first electric roller and the second electric roller are controlled to continuously drive the oil absorption belt to rotate, so that the moving oil absorption belt continuously adsorbs grease through different parts, and the problem that the grease cannot be adsorbed due to the fact that the oil absorption amount of the same part reaches the limit is solved.

Description

Technical Field

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

[0002] Chemical products are diverse and complex in composition. The wastewater discharged from chemical plants is called chemical wastewater. Most of them are highly toxic and difficult to purify. After being absorbed by organisms, they have a certain accumulation effect in their bodies. They have obvious oxygen-consuming properties in water bodies and can easily deteriorate water quality. If these wastewaters are discharged without treatment, they will cause pollution of different properties and degrees in water bodies, thereby endangering human health and affecting industrial and agricultural production.

[0003] Since chemical wastewater contains water-insoluble impurities such as grease, when the chemical wastewater purification device in the prior art purifies chemical wastewater, it is difficult to separate the grease from water due to the high concentration and viscosity of the grease, making it inconvenient to clean and remove the water-insoluble impurities such as grease contained in the wastewater, which invisibly affects the purification efficiency of the chemical wastewater purification device. Summary of the invention

[0004] In order to overcome the disadvantage that grease has a high concentration and viscosity, making it difficult to separate grease from water, thereby making it inconvenient to clean and remove water-insoluble impurities such as grease contained in wastewater, the present invention provides a wastewater treatment device for chemical product production.

[0005] The technical scheme is as follows: A sewage treatment device for chemical product production includes a sewage tank; a sewage discharge pipe is arranged at the front of the sewage tank, a liquid inlet pipe is arranged at the rear of the sewage tank, and a notch is opened on the left and right sides of the sewage tank; it also includes a door 1, an electric roller 1, an oil suction belt, a guide plate, an electric roller 2, a scraper, an oil outlet pipe, an oil collecting tank, a filter screen and an aerator; a plurality of doors 1 are opened on the sewage tank; a plurality of electric rollers 1 are connected to the inside of the sewage tank; a plurality of electric rollers 2 are connected to the inside of the sewage tank; all the electric rollers 1 and all the electric rollers 2 are wound around An oil suction belt is provided; a plurality of guide plates are fixedly connected in the sewage tank, and a recess is provided in the middle of each guide plate; a scraper is fixedly connected to the upper right part of each recess, and each scraper is fitted with the oil suction belt; a plurality of oil outlet pipes are fixedly connected and connected to the front side of the sewage tank, and the bottom of each oil outlet pipe is flush with the bottom of the corresponding recess; an oil collecting tank is fixedly connected to the front side of the sewage tank, and the oil collecting tank is located below the oil outlet pipe; a filter is connected to the inside of the sewage tank, and a connecting rope is provided on the upper part of the filter; an aerator is fixedly connected to the bottom of the sewage tank, and the aerator is connected to the inside of the sewage tank.

[0006] Preferably, a gap is formed between two adjacent guide plates, and each gap is located above the corresponding electric roller 2.

[0007] Preferably, the gap cooperates with the second electric roller to limit the oil absorption belt to a V-shaped oil absorption portion.

[0008] Preferably, each recessed portion is arranged to be gradually inclined downward from the back to the front, and the lowest point of the inclination is aligned with the oil outlet pipe.

[0009] Preferably, it also includes a collecting box, a motor, a rotating roller 1, a pull rope, a rotating roller 2 and a rotating roller 3; a collecting box is fixedly connected to the left and right sides of the sewage tank, and each collecting box is provided with a door 2; a motor is fixedly connected to the front side of each collecting box; each collecting box has a rotating roller 1, a rotating roller 2 and a rotating roller 3 rotatably connected inside, the rotating roller 3 is located at the lower right of the rotating roller 2, and the rotating roller 1 is located below the rotating roller 3, and the rotating part of each motor is fixedly connected to the corresponding rotating roller 1; each rotating roller 1 is fixedly connected to a number of pull ropes, and each pull rope passes around the upper surface of the corresponding rotating roller 1, rotating roller 2 and rotating roller 3 and is fixedly connected to the connecting rope of the filter net.

[0010] Preferably, each of the rotating rollers 1, 2 and 3 is arranged in a spindle shape with a diameter gradually decreasing from the middle to the front and rear ends.

[0011] Preferably, a baffle is also included; a baffle is fixedly connected to the front side and the rear side of the sewage tank, and each baffle is located above the connecting rope and contacts the connecting rope.

[0012] Preferably, each baffle is arranged to be inclined toward the bottom of the sewage tank.

[0013] Preferably, an isolation net is also included; a plurality of isolation nets are fixedly connected to the inner side of the filter net, each isolation net is arranged in an arc shape, an interception part is arranged on the upper part of each isolation net, and each interception part is inclined obliquely to the upper right and higher than the baffle.

[0014] As a preference, it also includes convex blocks; a plurality of convex blocks are fixedly connected to the rotating roller three.

[0015] The present invention has the following advantages: the present invention controls the electric roller 1 and the electric roller 2 to continuously drive the oil absorption belt to rotate, so that the moving oil absorption belt can continuously absorb grease through different parts, thereby alleviating the problem that the oil absorption amount of the same part reaches the limit and cannot absorb grease.

[0016] The present invention controls the motors on the left and right sides to drive the corresponding rotating rollers 1 to rotate synchronously, so that the pull rope pulls the filter screen to drive the sediment to be pulled out from the gap on the right side. When the filter screen contacts the rotating rollers 1, 2 and 3, the middle parts of the rotating rollers 1, 2 and 3 will support the middle part of the filter screen, so that the filter screen is in an outward-turned shape with a convex middle part, so that the sediment inside the filter screen is spread out. As the rotating roller 1 on the right side continues to reel in the pull rope, when the filter screen tilts downward under the pull of the pull rope, the sediment in the filter screen will fall downward into the collection box and be collected.

[0017] The present invention separates the sediment by arranging a plurality of isolation nets in the filter net, so that when the filter net drives the sediment to move upward, the sediment will not all gather into a ball, resulting in the weight of the sediment being concentrated on the leftmost side of the filter net, thereby reducing the risk of damage to the pull rope. At the same time, each isolation net is provided with an interception part, and the interception part is arranged in an inclined shape. When the isolation net is perpendicular to the right side wall surface in the sewage tank, the sediment will fall on the interception part, and because the isolation net is arranged in an arc shape, the sediment will not slide out from the front edge and the rear edge of the isolation net. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first structure of the sewage treatment device for chemical product production disclosed by the present invention; Figure 2 This is a schematic diagram of the second structure of the sewage treatment device for chemical product production disclosed by the present invention; Figure 3 A structural cross-sectional view of a sewage tank disclosed in the sewage treatment device for chemical product production of the present invention; Figure 4 It is a schematic diagram of the structure of the scraper disclosed in the sewage treatment device for chemical product production of the present invention; Figure 5 The exploded view of the electric roller 1, the oil absorption belt, the guide plate, the electric roller 2 and the scraper disclosed in the sewage treatment device for chemical product production of the present invention; Figure 6 It is a schematic structural diagram of a rotating roller 1, a pull rope, a baffle, an isolation net, a convex block, a rotating roller 2 and a rotating roller 3 disclosed in the sewage treatment device for chemical product production of the present invention; Figure 7 The present invention is a schematic diagram of the winding operation of the filter screen, the first rotating roller, the isolation screen, the second rotating roller and the third rotating roller disclosed in the sewage treatment device for chemical product production.

[0019] Explanation of the reference numerals: 1-sewage tank, 2-door one, 3-electric roller one, 4-oil suction belt, 5-guide plate, 6-electric roller two, 7-scraper, 8-oil outlet pipe, 9-oil collecting tank, 10-filter screen, 11-aerator, 101-collecting box, 102-motor, 103-rotating roller one, 104-pull rope, 105-baffle, 106-isolation net, 107-bump, 108-rotating roller two, 109-rotating roller three, 1a-drain pipe, 1b-liquid inlet pipe, 1c-notch, 5a-recessed portion, 5b-gap, 10a-connecting rope, 101a-door two, 106a-intercepting portion. DETAILED DESCRIPTION

[0020] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] Example 1 A sewage treatment device for chemical production, such as Figure 1-5 As shown, it includes a sewage tank 1; a sewage discharge pipe 1a is arranged at the front of the sewage tank 1, a liquid inlet pipe 1b is arranged at the rear of the sewage tank 1, and a notch 1c is opened on the left and right sides of the sewage tank 1; It also includes a door 2, an electric roller 3, an oil absorption belt 4, a guide plate 5, an electric roller 6, a scraper 7, an oil outlet pipe 8, an oil collecting box 9, a filter screen 10 and an aerator 11; two doors 2 are provided on the sewage tank 1; a plurality of electric rollers 3 are connected to the inside of the sewage tank 1; a plurality of electric rollers 6 are connected to the inside of the sewage tank 1; an oil absorption belt 4 is wound around all the electric rollers 3 and all the electric rollers 6; three guide plates 5 are fixedly connected to the sewage tank 1, and a concave portion 5a is provided in the middle of each guide plate 5; each concave portion A scraper 7 is fixedly connected to the upper right part of the part 5a, and each scraper 7 is in contact with the oil suction belt 4; three oil outlet pipes 8 are fixedly connected and connected to the front side of the sewage tank 1, and the inner bottom of each oil outlet pipe 8 is flush with the bottom of the corresponding recessed part 5a; an oil collecting tank 9 is bolted to the front side of the sewage tank 1, and the oil collecting tank 9 is located below the oil outlet pipe 8; a filter screen 10 is connected to the inside of the sewage tank 1, and a connecting rope 10a is provided on the upper part of the filter screen 10; an aerator 11 is bolted to the bottom of the sewage tank 1, and the aerator 11 is connected to the inside of the sewage tank 1.

[0022] A gap 5b is formed between two adjacent guide plates 5, and each gap 5b is located above the corresponding electric roller 2 6, so that the grease in the wastewater can be quickly gathered together when floating up, so as to facilitate the removal of the grease.

[0023] The gap 5b cooperates with the motorized roller 2 6 to restrict the oil-absorbing belt 4 to form a V-shaped oil-absorbing portion, so that the oil-absorbing belt 4 can better absorb the grease.

[0024] Each lower recess 5a is arranged to be gradually inclined downward from the back to the front, and the lowest point of the inclination is aligned with the oil outlet pipe 8, so that the grease is guided to the oil collecting tank 9, thereby accelerating the grease collection efficiency.

[0025] Here is how the above example works: First, connect the liquid inlet pipe 1b to the external sewage device, connect the sewage discharge pipe 1a to the pre-treated water collecting device, connect the electric roller 1 3, the electric roller 2 6 and the aerator 11 to the power supply. When in use, the external sewage device passes the sewage into the sewage tank 1 through the liquid inlet pipe 1b until the liquid level of the sewage is higher than the concave portion 5a and lower than the gap 5b, then the operator adds a flocculant to purify the sewage and flocculate the sediment. After standing for a period of time, the sediment gathers and settles in the filter net 10 at the bottom of the sewage tank 1. When the sewage is purified, the operator opens the sewage discharge pipe 1a to pass the purified pre-treated water into the pre-treated water collecting device. Then the operator removes the sediment in the filter net 10 to complete a sewage treatment operation.

[0026] Considering that chemical wastewater contains grease, since the density of grease is lower than that of water, the grease will float upward to the surface of the wastewater, and it is not easy to remove the grease. Therefore, the aerator 11 is controlled to aerate the wastewater tank 1, so that the grease in the wastewater floats upward quickly, and the grease will quickly float to the gap 5b. When the oil absorption belt 4 contacts the grease floating on the surface of the wastewater, the grease is adsorbed and removed. However, the oil absorption capacity of the oil absorption belt 4 at the same position is limited. When the oil absorption capacity reaches the limit, the grease can no longer be adsorbed. Therefore, the electric roller 3 is controlled to continuously drive the oil absorption belt 4 to rotate. Since the electric roller 3 continuously drives the oil absorption belt 4 to rotate, the moving oil absorption belt 4 continuously adsorbs the grease through different parts, alleviating the problem that the oil absorption capacity of the same part reaches the limit and the grease cannot be adsorbed.

[0027] Although the oil absorption belt 4 is rotated to extend the working time of the oil absorption belt 4 for grease, it will still reach a saturated state. Therefore, the scraper 7 is fitted with the electric roller 3. Therefore, when the oil absorption belt 4 rotates, the scraper 7 will squeeze the oil absorption belt 4, and squeeze out the grease adsorbed by the oil absorption belt 4. The squeezed grease will flow downward along the scraper 7 to the lower recess 5a, and then the grease will flow from the oil outlet pipe 8 to the oil collecting tank 9 through the lower recess 5a. In this way, the grease in the wastewater can be continuously adsorbed, and the grease can be scraped and transferred in time, thereby improving the working efficiency. At the same time, by setting the lower recess 5a to be gradually inclined downward from back to front, and the lowest point of the inclination is aligned with the oil outlet pipe 8, the grease is guided to the oil collecting tank 9, thereby accelerating the collection efficiency of the grease.

[0028] When the oil absorption belt 4 reaches the limit of its service life, it is necessary to replace the oil absorption belt 4. When it is necessary to replace the oil absorption belt 4, the operator only needs to rotate the door 2 upward to open it, and then the oil absorption belt 4 can be replaced. After replacing the oil absorption belt 4, the door 2 can be closed. By arranging a plurality of "U"-shaped guide plates 5 side by side in a state close to each other, the oil stains at different positions are separated, and further on the basis of separation, the separated oil stains are gathered in the inverted "U"-shaped space between the two guide plates 5 by utilizing the characteristic of "oil floating on water", and finally the originally dispersed oil stains are gathered together to avoid the oil stains being dispersed in the entire sewage surface layer, thereby improving the adsorption efficiency.

[0029] Example 2 On the basis of Example 1, Figure 1-7 As shown, it also includes a collecting box 101, a motor 102, a rotating roller 103, a pull rope 104, a rotating roller 2 108 and a rotating roller 3 109; a collecting box 101 is fixedly connected to the left and right sides of the sewage tank 1, and each collecting box 101 is provided with a door 2 101a; a motor 102 is bolted to the front side of each collecting box 101; each collecting box 101 has a rotating roller 103, a rotating roller 2 108 and a rotating roller 3 109 rotatably connected inside, the rotating roller 3 109 is located at the lower right of the rotating roller 2 108, and the rotating roller 103 is located below the rotating roller 3 109, and the rotating part of each motor 102 is fixedly connected to the corresponding rotating roller 1 103; each rotating roller 103 is fixedly connected to two pull ropes 104, and each pull rope 104 passes around the upper surface of the corresponding rotating roller 103, rotating roller 2 108 and rotating roller 3 109 and is fixedly connected to the connecting rope 10a of the filter screen 10.

[0030] Each of rotating roller 103, rotating roller 2 108 and rotating roller 3 109 is spindle-shaped with a diameter gradually decreasing from the middle to the front and rear ends. When the filter net 10 is in contact with the surfaces of rotating roller 103, rotating roller 2 108 and rotating roller 3 109, the filter net 10 will be squeezed upward by the raised parts in the middle of rotating roller 103, rotating roller 2 108 and rotating roller 3 109, so that the sediment in the filter net 10 can be better discharged.

[0031] It also includes a baffle 105; a baffle 105 is fixedly connected to the front and rear sides of the sewage tank 1, and each baffle 105 is located above the connecting rope 10a and contacts the connecting rope 10a.

[0032] Each baffle 105 is tilted toward the bottom of the sewage tank 1 to prevent the connection rope 10a from being separated from the bottom of the baffle 105, causing the filter screen 10 to close together and affecting the collection of sediment.

[0033] It also includes an isolation net 106; a plurality of isolation nets 106 are fixedly connected to the inner side of the filter net 10, each isolation net 106 is arranged in an arc shape, and an interception portion 106a is arranged on the upper part of each isolation net 106, and each interception portion 106a is inclined upward and higher than the baffle 105.

[0034] It also includes a protrusion 107; ten protrusions 107 are fixedly connected to the rotating roller 3 109.

[0035] Here is how the above example works: When the sediment is gathered in the filter screen 10 and needs to be discharged, the operator needs to take out the filter screen 10, and after cleaning the sediment in the filter screen 10, put the filter screen 10 back into the sewage tank 1. The operation is cumbersome and inefficient. Therefore, when the sediment in the filter screen 10 needs to be discharged, the motor 102 on the right side is controlled to drive the rotating roller 103 to rotate clockwise from the front to the back, so that the rotating roller 103 reels the pull rope 104, and then the pull rope 104 pulls the right end of the filter screen 10 to move upward. At the same time, the motor 102 on the left side drives the rotating roller 103 to rotate clockwise from the front to the back, so that the reel 104 and the filter screen 10 wound on the left rotating roller 103 are released. As the rotating roller 103 on the right side continues to reel in the pull rope 104, the filter screen 10 drives the sediment to continue to move upward and is pulled out from the gap 1c on the right. When the filter screen 10 and the rotating roller 10 3. When the rotating roller 108 and the rotating roller 3 109 are in contact, the middle parts of the rotating roller 103, the rotating roller 108 and the rotating roller 3 109 will support the middle part of the filter screen 10, so that the filter screen 10 is in an outward-turned shape with a bulge in the middle, so that the sediment inside the filter screen 10 is spread out, and as the rotating roller 103 on the right side continues to reel in the pull rope 104, when the filter screen 10 is pulled downward by the pull rope 104, the sediment in the filter screen 10 will fall downward into the collection box 101 and be collected, and as the rotating roller 103 continues to reel in the pull rope 104, the cleaned filter screen 10 will be reeled onto the surface of the rotating roller 103. When the filter screen 10 is completely reeled onto the surface of the rotating roller 103 on the right side, the filter screen 10 on the left side is completely unfolded to the bottom of the sewage tank 1, replacing the original filter screen 10 on the right side, thereby achieving the cleaning of the filter screen 10 and replacing the new filter screen 10 at the same time, which is simple to operate and highly efficient.

[0036] At the same time, a plurality of isolation nets 106 are arranged in the filter net 10 to separate the sediments, so that when the filter net 10 drives the sediments to move upward, they will not all gather into a ball, resulting in the weight of the sediments being concentrated on the leftmost side of the filter net 10, thereby reducing the risk of damage to the pull rope 104. At the same time, each isolation net 106 is provided with an interception portion 106a, and the interception portion 106a is arranged in an inclined shape. When the isolation net 106 is perpendicular to the right wall surface in the sewage tank 1, as shown in FIG. Figure 7As shown in FIG. 1 , the sediment will fall on the intercepting portion 106a, and because the isolation net 106 is arranged in an arc shape, the sediment will not slide out from the front edge and the rear edge of the isolation net 106, thereby preventing the sediment from overflowing the filter net 10 and falling back into the sewage tank 1. When the intercepting portion 106a moves to the right side of the rotating roller 3 109, as shown in FIG. Figure 7 As shown, the sediment on the interception portion 106 a will fall downward into the collection box 101 .

[0037] Furthermore, when the pull rope 104 pulls the filter 10, the connecting rope 10a is restricted at the bottom by the baffle 105, so that the filter 10 always moves under the water surface during the process of being pulled from the left end of the baffle 105 to the right end of the baffle 105. Even if the sediment is still affected by the buoyancy of the water during the movement, the gravity from the sediment when the pull rope 104 is pulled is reduced, thereby extending the service life of the pull rope 104. At the same time, the baffle 105 is set to be inclined toward the bottom of the sewage tank 1, so as to avoid the problem that the connecting rope 10a of the filter 10 is separated from the bottom of the baffle 105 when the pull rope 104 is pulled, causing the filter 10 to close together and affecting the collection of sediment.

[0038] At the same time, ten protrusions 107 are arranged on the rotating roller three 109. When the rotating roller three 109 rotates, the protrusions 107 are driven to rotate synchronously, so that the protrusions 107 move the filter screen 10, thereby making the sediment on the filter screen 10 removed more cleanly. When there is a lot of sediment in the collection box 101, you only need to open the door two 101a to quickly clean the sediment inside.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewage treatment device for chemical production, comprising a sewage tank (1); a sewage discharge pipe (1a) is arranged at the front of the sewage tank (1), a liquid inlet pipe (1b) is arranged at the rear of the sewage tank (1), and a notch (1c) is provided on both the left and right sides of the sewage tank (1); the characteristics are as follows: It also comprises a door 1 (2), an electric roller 1 (3), an oil absorption belt (4), a guide plate (5), an electric roller 2 (6), a scraper (7), an oil outlet pipe (8), an oil collecting box (9), a filter screen (10) and an aerator (11); a plurality of doors 1 (2) are provided on the sewage tank (1); a plurality of electric rollers 1 (3) are connected inside the sewage tank (1); a plurality of electric rollers 2 (6) are connected inside the sewage tank (1); an oil absorption belt (4) is wound around all the electric rollers 1 (3) and all the electric rollers 2 (6); a plurality of guide plates (5) are fixed inside the sewage tank (1), and a concave portion (5a) is provided in the middle of each guide plate (5). ; A scraper (7) is fixedly connected to the upper right part of each lower concave part (5a), and each scraper (7) is in contact with the oil absorption belt (4); a plurality of oil outlet pipes (8) are fixedly connected to and communicated with the front side of the sewage tank (1), and the inner bottom of each oil outlet pipe (8) is flush with the bottom of the corresponding lower concave part (5a); an oil collecting box (9) is fixedly connected to the front side of the sewage tank (1), and the oil collecting box (9) is located below the oil outlet pipe (8); a filter screen (10) is connected to the inner side of the sewage tank (1), and a connecting rope (10a) is provided on the upper part of the filter screen (10); an aerator (11) is fixedly connected to the bottom of the sewage tank (1), and the aerator (11) is communicated with the inside of the sewage tank (1).

2. A sewage treatment device for chemical production according to claim 1, characterized in that: A gap (5b) is formed between two adjacent guide plates (5), and each gap (5b) is located above the corresponding electric roller 2 (6).

3. A sewage treatment device for chemical production according to claim 2, characterized in that: The gap (5b) cooperates with the second electric roller (6) to restrict the oil absorption belt (4) to form a V-shaped oil absorption portion.

4. A sewage treatment device for chemical production according to claim 1, characterized in that: Each lower recess (5a) is arranged to be gradually inclined downward from the back to the front, and the lowest point of the inclination is aligned with the oil outlet pipe (8).

5. A sewage treatment device for chemical production according to claim 1, characterized in that: The sewage tank (1) also includes a collection box (101), a motor (102), a rotating roller 1 (103), a pull rope (104), a rotating roller 2 (108) and a rotating roller 3 (109); a collection box (101) is fixedly connected to the left and right sides of the sewage tank (1), and each collection box (101) is provided with a door 2 (101a); a motor (102) is fixedly connected to the front side of each collection box (101); each collection box (101) has a rotating roller 1 (103), a rotating roller 2 (108) and a rotating roller 3 (109) in a rotatable manner. Rotating roller three (109), rotating roller three (109) is located to the lower right of rotating roller two (108), rotating roller one (103) is located below rotating roller three (109), and the rotating part of each motor (102) is fixedly connected to the corresponding rotating roller one (103); each rotating roller one (103) is fixedly connected to a plurality of pull ropes (104), and each pull rope (104) is passed around the upper surface of the corresponding rotating roller one (103), rotating roller two (108) and rotating roller three (109) and is fixedly connected to the connecting rope (10a) of the filter screen (10).

6. A sewage treatment device for chemical production according to claim 5, characterized in that: Each of the rotating roller 1 (103), the rotating roller 2 (108) and the rotating roller 3 (109) is arranged in a spindle shape with a diameter gradually decreasing from the middle to the front and rear ends.

7. A sewage treatment device for chemical production according to claim 5, characterized in that: It also includes a baffle (105); a baffle (105) is fixedly connected to the inner front side and the inner rear side of the sewage tank (1), and each baffle (105) is located above the connecting rope (10a) and is in contact with the connecting rope (10a).

8. A sewage treatment device for chemical production according to claim 7, characterized in that: Each baffle (105) is arranged to be inclined toward the bottom of the sewage tank (1).

9. A sewage treatment device for chemical production according to claim 8, characterized in that: It also includes an isolation net (106); a plurality of isolation nets (106) are fixedly connected to the inner side of the filter net (10); each isolation net (106) is arranged in an arc shape; an interception portion (106a) is arranged on the upper part of each isolation net (106); each interception portion (106a) is inclined upward to the right and is higher than the baffle (105).

10. A sewage treatment device for chemical production according to claim 6, characterized in that: It also includes a protrusion (107); a plurality of protrusions (107) are fixedly connected to the rotating roller three (109).

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