A sewage treatment plant for purifying industrial wastewater

Abstract

The present application relates to sewage treatment equipment technical field, disclose a kind of sewage treatment equipment for purifying industrial wastewater, including equipment main body, be set to the scraper of equipment main body top, further include the filter mechanism being set to equipment main body top near the scraper;Filter mechanism includes the apron being set to equipment main body top near the scraper, motor is set to the outside of apron, pulley group is set to the output shaft of motor, fixed roller is set to the inside of apron near pulley group main wheel, sliding hole is symmetrically opened in the side of apron near scraper, sliding block is set to the inner wall of sliding hole, moving roller is commonly arranged between two sliding blocks, sliding slot is symmetrically opened in the inner wall of equipment main body two sides, lifting roller is commonly arranged in the inside of two sliding slots, reset spring is set to the inner wall of sliding slot.By setting filter mechanism, flocculation on the liquid level of air floatation machine can be converted from liquid to solid cake dry material, realize the dewatering and reduction of scum.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a wastewater treatment device for purifying industrial wastewater. Background Technology

[0002] Common industrial wastewater treatment equipment is mainly divided into three categories: dissolved air flotation (DAF), vortex flotation (VAF), and shallow flotation (SAF). DAF is a widely used, highly efficient solid-liquid separation device in industrial wastewater treatment. Its principle is to generate a large number of tiny bubbles in the water, which adhere to suspended particles, oils, and other pollutants. Buoyancy carries these pollutants to the surface, forming scum, which is then removed by a scraping system, thus purifying the water. Based on the different bubble generation methods, it is mainly divided into DAF, VAF, and SAF: Dissolved air flotation (DAF) uses pressurized dissolved air that is then rapidly released to form uniform microbubbles, achieving a removal rate of over 95% and is the most widely used; VAF utilizes a high-speed impeller to draw in and cut air, resulting in a compact structure and low operating costs, making it particularly suitable for the pretreatment of oily wastewater; Shallow flotation is based on the shallow pool theory, with a water depth of only about half a meter, resulting in a short hydraulic retention time, small footprint, and high efficiency. With its advantages of low investment, small footprint, and high degree of automation, air flotation machines have been widely used in wastewater treatment in industries such as petroleum, chemical, papermaking, printing and dyeing, electroplating, and food processing.

[0003] Traditional wastewater treatment equipment is widely used in the chemical industry, but due to limitations in its structure and working principle, it often suffers from some unavoidable problems. Conventional equipment is only equipped with a simple skimmer to scrape flocculent matter from the liquid surface into a collection tank. Its shortcomings are mainly manifested in the following ways: the scraped scum has an extremely high water content, requiring separate sludge dewatering equipment for further treatment, resulting in high investment and operating costs; the skimming depth is fixed and cannot be flexibly adjusted according to liquid level fluctuations or scum thickness, nor can the squeezing pressure be adjusted to adapt to different flocculent characteristics; the lack of a diversion block and two-stage squeezing design makes it difficult to quickly remove internal water from the scum, resulting in low dewatering efficiency; even with the addition of filter cloth, it is impossible to quickly detach the filter cloth from the liquid surface when the machine is stopped, leading to long-term immersion and clogging of the filter cloth, making maintenance inconvenient. Summary of the Invention

[0004] Given the existing technical problems that wastewater treatment equipment relies solely on a skimmer to collect scum and lacks a filtration unit that integrates conveying, grading, extrusion, and tension adjustment, resulting in high scum moisture content and the need for secondary dewatering, a wastewater treatment device for purifying industrial wastewater is proposed.

[0005] Its purpose is to integrate a filter cloth filtration unit with adjustable water depth and squeezing pressure into the equipment, so as to achieve instant dewatering of scum and collection of dry material, avoiding secondary treatment.

[0006] The technical solution of the present invention is a sewage treatment device for purifying industrial wastewater, including a main body of the device, a skimmer disposed on the top of the main body of the device, and a filter mechanism disposed on the top of the main body of the device near the skimmer. The filtration mechanism includes a surrounding plate located at the top of the main body of the equipment near the atomizer, a motor located on the outside of the surrounding plate, a pulley assembly on the output shaft of the motor, a fixed roller located on the inside of the surrounding plate near the main pulley of the pulley assembly, symmetrical sliding holes on the side of the surrounding plate near the atomizer, sliders located on the inner wall of the sliding holes, a movable roller located between the two sliders, symmetrical grooves on the inner walls of both sides of the main body of the equipment, lifting rollers located inside the two grooves, a return spring located on the inner wall of the groove, with its two ends fixedly connected to the groove and the lifting roller respectively, a primary filter cloth sleeved on the outside of the fixed roller, the movable roller, and the lifting roller, an inclined pressure plate located on the surrounding plate near the top of the primary filter cloth, a lead screw located on the side of the slider away from the movable roller, a worm gear pair located on the end of the lead screw near the slider, a connecting rod located between the worms in the two worm gear pairs, and an adjustment unit located on the side of the surrounding plate away from the atomizer.

[0007] Furthermore, bearing sleeves are provided at both ends of the lifting roller, the outer wall of the bearing sleeve is slidably connected to the inner wall of the groove, and the bottom end of the return spring is fixedly connected to the bearing sleeve.

[0008] Furthermore, support blocks are provided on both sides of the enclosure near the worm gear pair, the inner wall of the support blocks is slidably connected to the worm gear pair, and a handle is provided at the end of the connecting rod away from the motor.

[0009] Furthermore, the bottom of the inclined pressure plate is provided with several diversion blocks arranged in a linear array, and the diversion blocks are wedge-shaped.

[0010] Furthermore, the adjustment unit includes a handwheel located on the side of the enclosure away from the skimmer, a cross arm located on the side of the handwheel away from the skimmer, traction holes symmetrically opened on the enclosure near both ends of the cross arm, traction rollers jointly disposed on the inner walls of the two traction holes, the two ends of the traction rollers being rotatably connected to the two ends of the cross arm respectively, an upper pressure roller located on the inner side of the enclosure near the auxiliary wheel of the pulley group, a lower pressure roller located on the enclosure near the bottom of the fixed roller, and a secondary filter cloth jointly sleeved on the outer wall of the upper pressure roller, the lower pressure roller, and the traction roller.

[0011] Furthermore, a screw is provided at one end of the handwheel near the side plate, and the inner wall of the side plate near the handwheel is adapted to be threadedly connected to the screw.

[0012] Furthermore, the two ends of the cross arm are provided with collars, the inner wall of the collars is rotatably connected to the outer wall of the traction roller, and both ends of the traction roller are provided with bearing sleeves identical to those at both ends of the lifting roller, the outer wall of the bearing sleeves is slidably connected to the inner wall of the traction hole.

[0013] Furthermore, the secondary filter cloth has the same width as the primary filter cloth, and the mesh count of the secondary filter cloth is equal to that of the primary filter cloth.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a filtration mechanism, the flocculent material on the surface of the dissolved air flotation machine can be transformed from a liquid state into a solid cake-like dry material, achieving dewatering and volume reduction of scum. This process eliminates the need for a separate sludge dewatering device, reducing the overall investment and operating costs of the wastewater treatment system. The dewatered dry material has a low moisture content, making it easy to collect, transport, or utilize directly. At the same time, the filtration mechanism continuously cleans the filter cloth mesh during operation, maintaining stable filtration efficiency and avoiding the problems of decay and secondary pollution caused by long-term soaking of scum, thus improving the automation level and treatment effect of the dissolved air flotation machine.

[0015] 2. By setting up an adjustment unit, operators can flexibly change the dewatering intensity of the filtration mechanism according to the concentration, viscosity, and thickness of the flocculent material. This allows the equipment to achieve a stable dry material discharge effect under various operating conditions. The adjustment process is simple and reliable, requiring no machine shutdown or component replacement, thus extending the cleaning cycle and service life of the filter components. In addition, the adjustment unit can control the contact depth between the filter components and the liquid surface, allowing the filter components to quickly detach from the liquid surface when the machine stops working, reducing unnecessary wetting and clogging, and lowering the frequency of equipment maintenance and labor intensity.

[0016] 3. By setting up inclined pressure plates, the conveyed flocculent material can be naturally separated into multiple strip-shaped accumulations. This morphological change increases the dewatering speed of the flocculent material, while removing the continuous covering layer on the surface of the filter cloth, keeping the filter cloth mesh unobstructed. Water can quickly seep down from the blank areas between the strips, avoiding the problem of slow drainage caused by waterlogging due to thick layer accumulation. The strip-shaped flocculent material is subjected to more uniform force during subsequent compression, and the dewatering efficiency is significantly improved. Moreover, shaping and diversion can be completed without additional power. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a schematic diagram of the enclosure structure of the present invention; Figure 3 This is a schematic diagram of the connection between the chute and the lifting roller of the present invention; Figure 4 This is a schematic diagram showing the connection between the inclined pressure plate and the surrounding plate of the present invention; Figure 5 This is a schematic diagram showing the relative positions of the enclosure plate, the fixed roller, and the traction roller according to the present invention; Figure 6 This is a schematic diagram of the connection between the movable roller and the slider of the present invention; Figure 7This is a schematic diagram of the connection between the worm gear pair and the lead screw according to the present invention; Figure 8 This is a schematic diagram of the connection between the cross arm and the handwheel of the present invention; Figure 9 This is a schematic diagram of the connection between the cross arm and the traction roller of the present invention; Figure 10 This is a schematic diagram of the sliding hole and traction hole structure of the present invention; Figure 11 This is a schematic diagram showing the connection between the primary filter cloth and the fixed roller of the present invention; Figure 12 This is a schematic diagram of the inclined pressure plate structure of the present invention.

[0018] In the picture: 1. Main body of the equipment; 2. Foam scraper; 3. Filtration mechanism; 31. Enclosure plate; 32. Motor; 33. Pulley assembly; 34. Fixed roller; 35. Sliding hole; 36. Sliding block; 37. Moving roller; 38. Slide groove; 39. Lifting roller; 310. Return spring; 311. Primary filter cloth; 312. Inclined pressure plate; 313. Lead screw; 314. Worm gear pair; 315. Connecting rod; 316. Handwheel; 317. Cross arm; 318. Traction hole; 319. Traction roller; 320. Upper pressure roller; 321. Lower pressure roller; 322. Secondary filter cloth. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1, referring to Figures 1-12 The first embodiment of the present invention provides a wastewater treatment device for purifying industrial wastewater, including a device body 1, a skimmer 2 fixedly connected to the top of the device body 1, and a filter mechanism 3 installed on the top of the device body 1 near the skimmer 2. The filtration mechanism 3 includes a surrounding plate 31 fixedly connected to the top of the main body 1 near the atomizer 2, a motor 32 fixedly connected to the outside of the surrounding plate 31, a pulley assembly 33 fixedly connected to the output shaft of the motor 32, a fixed roller 34 rotatably connected to the inner side of the surrounding plate 31 near the main pulley of the pulley assembly 33, sliding holes 35 symmetrically opened on the side of the surrounding plate 31 near the atomizer 2, sliders 36 slidably connected to the inner wall of the sliding holes 35, a moving roller 37 rotatably connected between the two sliders 36, and sliding grooves 38 symmetrically opened on the inner walls of both sides of the main body 1, lifting rollers 39 slidably connected to the inside of the two sliding grooves 38, and a fixed roller 39 fixedly connected to the sliding hole 31. The return spring 310 on the inner wall of the groove 38 has two ends fixedly connected to the groove 38 and the lifting roller 39 respectively. The primary filter cloth 311 is sleeved on the outside of the fixed roller 34, the moving roller 37 and the lifting roller 39. The inclined pressure plate 312 is fixedly connected to the top of the primary filter cloth 311 near the wall plate 31. The lead screw 313 is fixedly connected to the side of the slider 36 away from the moving roller 37. The worm gear pair 314 is threaded to the end of the lead screw 313 near the slider 36. The connecting rod 315 is fixedly connected between the worms in the two worm gear pairs 314. The adjustment unit is assembled on the side of the wall plate 31 away from the skimmer 2.

[0021] Specifically, the main body of the equipment 1 is divided into two spaces by a partition. The space near the lower pressure roller 321 is a collection tank, and the space away from the lower pressure roller 321 is a flotation tank. When it is necessary to dewater the flocculent matter in the flotation tank, the curved handle on the connecting rod 315 is rotated. The connecting rod 315 drives the two worm gear pairs 314 to rotate. While the worm gear pairs 314 are rotating, they drive the lead screw 313 to move away from the skimmer 2. The lead screw 313 drives the slider 36 to move along the sliding hole 35. The slider 36 drives the moving roller 37 to move. Because the lifting roller 39 is subjected to the return spring 310, it always maintains its direction. The primary filter cloth 311 moves downwards, but its movement is constrained by the primary filter cloth 311. Simultaneously, the primary filter cloth 311 remains taut due to the movement of the moving roller 37 away from the skimmer 2. As the moving roller 37 moves away from the fixed roller 34, the distance between the moving roller 37 and the fixed roller 34 decreases, causing the primary filter cloth 311 to relax. At this point, the lifting roller 39 moves downwards along the chute 38 under the action of the return spring 310, keeping the primary filter cloth 311 taut. After the lifting roller 39 reaches its maximum stroke, it will be below the surface of the flotation tank, pulling a portion of the bottom of the primary filter cloth 311 below the surface at a certain angle. At this point, the motor 32 is started, and the motor 32, through the pulley assembly... 33 causes the fixed roller 34 to rotate. Simultaneously, the rotation of the fixed roller 34 drives the moving roller 37 and the lifting roller 39 to rotate via the primary filter cloth 311. The filter cloth itself also circulates around the moving roller 37 and the lifting roller 39 under the action of the fixed roller 34. During this circulation, the primary filter cloth 311 conveys the flocculent material from the surface of the flotation tank upwards through its inclined surface. When the flocculent material is conveyed to a height above the liquid surface, some of the water it carries is filtered through the mesh of the primary filter cloth 311. As the flocculent material continues to move, it passes through the inclined pressure plate 312. The flocculent material spread flat on the primary filter cloth 311 is divided into several strip-shaped pieces by the diverting blocks on the inclined pressure plate 312. The accumulated material, carrying moisture, can be drained more quickly from the blank areas of the primary filter cloth 311. Then, the accumulated material is further dehydrated by the pressure of the curved part of the inclined pressure plate 312. Then, the accumulated material reaches the joint between the primary filter cloth 311 and the secondary filter cloth 322, and is filtered by the double pressure of the primary filter cloth 311 and the secondary filter cloth 322 to form a cake-shaped dry material. It falls into the collection tank of the main body of the equipment 1 at the separation point of the primary filter cloth 311 and the secondary filter cloth 322. When it is not necessary to dehydrate the flocculent material in the flotation tank, the moving roller 37 is reset by rotating the worm gear pair 314 in the opposite direction, which drives the lifting roller 39 to move up and away from the liquid surface, so that the primary filter cloth 311 cannot contact the liquid surface.

[0022] Reference Figure 3 Both ends of the lifting roller 39 are provided with bearing sleeves, the outer wall of the bearing sleeve is slidably connected to the inner wall of the slide groove 38, and the bottom end of the return spring 310 is fixedly connected to the bearing sleeve.

[0023] Specifically, the lifting roller 39 is connected to the inner wall of the slide 38 through a bearing sleeve, so that it can move up and down while also having the freedom of rotation.

[0024] Reference Figures 2-7 Support blocks are provided on both sides of the enclosure 31 near the worm gear pair 314. The inner wall of the support block is slidably connected to the worm gear pair 314. A handle is provided at the end of the connecting rod 315 away from the motor 32.

[0025] Specifically, the force can be transmitted to the connecting rod 315 through the handle, which facilitates the rotation of the connecting rod 315, and the support block fixes and provides support for the worm gear pair 314.

[0026] Reference Figures 1-12 The bottom of the inclined pressure plate 312 is arranged in a linear array with several diversion blocks, and the diversion blocks are wedge-shaped.

[0027] Specifically, the inclined pressure plate 312 uses a diversion block to shape the flocculent material spread on the surface of the primary filter cloth 311 into strips, so that it can increase its own water discharge speed by relying on its own gravity and stacking height, and clear some of the mesh of the primary filter cloth 311 to facilitate water flow.

[0028] Example 2, refer to Figures 1-12 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the adjustment unit includes a handwheel 316 threadedly connected to the side of the enclosure plate 31 away from the skimmer 2, a cross arm 317 rotatably connected to the end of the handwheel 316 away from the skimmer 2, traction holes 318 symmetrically opened on the enclosure plate 31 near both ends of the cross arm 317, traction rollers 319 slidably connected to the inner walls of the two traction holes 318, the two ends of the traction rollers 319 being rotatably connected to the two ends of the cross arm 317 respectively, an upper pressure roller 320 rotatably connected to the inner side of the enclosure plate 31 near the auxiliary wheel of the pulley group 33, a lower pressure roller 321 rotatably connected to the enclosure plate 31 near the bottom of the fixed roller 34, and a secondary filter cloth 322 sleeved on the outer walls of the upper pressure roller 320, the lower pressure roller 321, and the traction roller 319.

[0029] Specifically, to meet different dewatering requirements for flocculent materials, when it is necessary to increase the pressure between the primary filter cloth 311 and the secondary filter cloth 322, the handwheel 316 is turned to move it away from the skimmer 2. Simultaneously, the horizontal arm 317 moves, and the horizontal arm 317 drives the traction roller 319 to move synchronously along the traction hole 318. When the traction roller 319 moves, it pulls the secondary filter cloth 322, increasing its tension. At this time, the compressive pressure between the secondary filter cloth 322 and the primary filter cloth 311 increases. Then, the motor 32 is started, causing the auxiliary wheel of the pulley group 33 to drive the upper pressure roller 320 to rotate. The upper pressure roller 320 causes the secondary filter cloth 322 to begin moving. When the material being pushed passes through, it will experience greater pressure. When it is necessary to reduce the pressure, the handwheel 316 is turned in the opposite direction to reduce the compressive pressure between the secondary filter cloth 322 and the primary filter cloth 311.

[0030] Reference Figure 5 and Figure 8 A screw is provided at one end of the handwheel 316 near the enclosure 31, and the inner wall of the enclosure 31 near the handwheel 316 is threadedly connected to the screw.

[0031] Specifically, during the rotation of the handwheel 316, it moves along the axis of the screw through the action of the thread between the screw and the surrounding plate 31.

[0032] Reference Figure 8 and Figure 9 Both ends of the cross arm 317 are provided with collars, the inner wall of the collars is rotatably connected to the outer wall of the traction roller 319, and both ends of the traction roller 319 are provided with bearing sleeves that are the same as those at both ends of the lifting roller 39, and the outer wall of the bearing sleeves is slidably connected to the inner wall of the traction hole 318.

[0033] Specifically, the horizontal arm 317 is connected to the traction roller 319 through the collars at both ends, so that the traction roller 319 can maintain its rotational freedom while moving horizontally along with the traction roller 319.

[0034] Reference Figure 11 The secondary filter cloth 322 has the same width as the primary filter cloth 311, and the mesh count of the secondary filter cloth 322 is equal to that of the primary filter cloth 311.

[0035] Specifically, the secondary filter cloth 322 has the same width and mesh count as the primary filter cloth 311, which facilitates mutual cooperation and ensures that the dewatering efficiency on both sides is similar when the accumulated material is squeezed. The rest of the structure is the same as that in Example 1.

[0036] Based on embodiments 1-2, the working principle of this invention is as follows: When dewatering flocculent matter in the flotation tank is required, first turn the handle to drive the connecting rod 315 and the worm gear pair 314 to rotate. The worm gear pair 314 drives the lead screw 313 to move the moving roller 37 away from the fixed roller 34, and the primary filter cloth 311 relaxes. At this time, the lifting roller 39 moves down along the slide groove 38 under the tension of the reset spring 310, tightening the primary filter cloth 311 and immersing its bottom below the liquid surface. Start the motor 32, and the fixed roller 34 drives the moving roller 37 and the lifting roller 39 to move synchronously through the primary filter cloth 311. The filter cloth tilts into the liquid surface at the lifting roller 39, adsorbs the flocculent matter and conveys it upward. When the flocculent matter is above the liquid surface, some water is naturally lost through the filter cloth mesh. Then the flocculent matter passes through the inclined pressure plate 312, and the diversion block at the bottom of the plate separates the flocculent matter into strip-shaped accumulations, accelerating the discharge of water. Then, it is subjected to initial compression through the curved part of the inclined pressure plate 312, further dewatering it.

[0037] Next, the flocculent material enters the bonding area between the primary filter cloth 311 and the secondary filter cloth 322. The motor 32 drives the upper pressure roller 320 through the auxiliary wheel of the pulley group 33, which drives the secondary filter cloth 322 to circulate. The two filter cloths perform double compression on the flocculent material to form a cake-shaped dry material, which automatically falls into the collection tank at the filter cloth separation point. When it is necessary to adjust the dewatering pressure, turn the handwheel 316 to move the screw drive cross arm 317 and traction roller 319 to change the tension of the secondary filter cloth 322, thereby adjusting the compression intensity. When stopping the work, turn the handle in the opposite direction to reset the moving roller 37. The lifting roller 39 moves upward with the change of filter cloth tension, and the bottom of the primary filter cloth 311 is separated from the liquid surface, and the dewatering process ends.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A wastewater treatment device for purifying industrial wastewater, comprising a main body (1) and a skimmer (2) disposed on the top of the main body (1), characterized in that: It also includes a filter mechanism (3) located on the top of the main body (1) near the skimmer (2); The filtration mechanism (3) includes a surrounding plate (31) located on the top of the main body (1) near the atomizer (2), a motor (32) located on the outside of the surrounding plate (31), a pulley assembly (33) located on the output shaft of the motor (32), a fixed roller (34) located on the inside of the surrounding plate (31) near the main wheel of the pulley assembly (33), symmetrically opened sliding holes (35) on the side of the surrounding plate (31) near the atomizer (2), sliding blocks (36) located on the inner wall of the sliding holes (35), moving rollers (37) located between the two sliding blocks (36), symmetrically opened grooves (38) on the inner walls of both sides of the main body (1), lifting rollers (39) located inside the two grooves (38), and a fixed roller (34) located on the inside of the grooves (35). 8) The return spring (310) on the inner wall, the two ends of the return spring (310) are fixedly connected to the slide groove (38) and the lifting roller (39) respectively, and are together sleeved on the primary filter cloth (311) outside the fixed roller (34), the moving roller (37) and the lifting roller (39), the inclined pressure plate (312) set on the top of the primary filter cloth (311) near the wall plate (31), the screw (313) set on the side of the slider (36) away from the moving roller (37), the worm gear pair (314) set on the end of the screw (313) near the slider (36), the connecting rod (315) set together between the worms in the two worm gear pairs (314), and the adjustment unit set on the side of the wall plate (31) away from the scraper (2).

2. The wastewater treatment equipment for purifying industrial wastewater according to claim 1, characterized in that: Both ends of the lifting roller (39) are provided with bearing sleeves, the outer wall of the bearing sleeve is slidably connected to the inner wall of the slide groove (38), and the bottom end of the reset spring (310) is fixedly connected to the bearing sleeve.

3. The wastewater treatment equipment for purifying industrial wastewater according to claim 1, characterized in that: Support blocks are provided on both sides of the enclosure (31) near the worm gear pair (314). The inner wall of the support block is slidably connected to the worm gear pair (314). A handle is provided at the end of the connecting rod (315) away from the motor (32).

4. The wastewater treatment equipment for purifying industrial wastewater according to claim 1, characterized in that: The bottom of the inclined pressure plate (312) is provided with several diversion blocks in a linear array, and the diversion blocks are wedge-shaped.

5. The wastewater treatment equipment for purifying industrial wastewater according to claim 1, characterized in that: The adjustment unit includes a handwheel (316) located on the side of the enclosure (31) away from the skimmer (2), a cross arm (317) located on the side of the handwheel (316) away from the skimmer (2), traction holes (318) symmetrically opened on both ends of the enclosure (31) near the cross arm (317), traction rollers (319) jointly set on the inner wall of the two traction holes (318), the two ends of the traction rollers (319) being rotatably connected to the two ends of the cross arm (317), an upper pressure roller (320) located on the inner side of the enclosure (31) near the auxiliary wheel of the pulley group (33), a lower pressure roller (321) located on the enclosure (31) near the bottom of the fixed roller (34), and a secondary filter cloth (322) jointly sleeved on the outer wall of the upper pressure roller (320), the lower pressure roller (321), and the traction roller (319).

6. The wastewater treatment equipment for purifying industrial wastewater according to claim 5, characterized in that: The handwheel (316) is provided with a screw at one end near the enclosure (31), and the inner wall of the enclosure (31) near the handwheel (316) is adapted to the screw thread connection.

7. The wastewater treatment equipment for purifying industrial wastewater according to claim 5, characterized in that: Both ends of the cross arm (317) are provided with collars, the inner wall of the collars is rotatably connected to the outer wall of the traction roller (319), and both ends of the traction roller (319) are provided with bearing sleeves that are the same as those at both ends of the lifting roller (39), and the outer wall of the bearing sleeves is slidably connected to the inner wall of the traction hole (318).

8. The wastewater treatment equipment for purifying industrial wastewater according to claim 5, characterized in that: The secondary filter cloth (322) has the same width as the primary filter cloth (311), and the mesh count of the secondary filter cloth (322) is the same as that of the primary filter cloth (311).

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