CN118458885A - A sewage treatment device and treatment method for grinding work - Google Patents

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to wastewater treatment equipment for polishing, which comprises a wastewater tank and a clean water tank which are matched with a polishing table, wherein a U-shaped purification tank is fixed on the upper side of the clean water tank, and an oil removing mechanism is arranged on the purification tank; a sewage treatment method for polishing work, comprising the steps of: the waste water is led into a purifying box for filtering, the oil absorbing cotton absorbs grease, and the grease is extruded into a grease collecting tank for collecting. According to the invention, the waste water is led into the purifying box, so that grease naturally floats to the two ends of the purifying box, the grease is adsorbed and led out through the downward movement of the oil absorbing cotton, and when the guide groove moves upwards, the oil absorbing cotton moves upwards and synchronously moves outwards to contact with the extrusion groove for extrusion and collection, the scraping plate swings left and right synchronously in the vertical movement process of the toothed plate, the impurities on the surface of the filter cloth are scraped for movement, the filter cloth is prevented from being blocked by natural distribution of the impurities, and the water body can smoothly pass through the filter cloth for filtering.

Description

A sewage treatment device and treatment method for grinding work

Technical Field

The invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device used for grinding work and a treatment method thereof.

Background Art

Polishing is a processing technology that uses friction to make the surface of an object smooth, shiny or reach a specific roughness. During the polishing process, water can play many important roles, such as lubrication, cooling, cleaning, and dust reduction. During the polishing process, water will gradually form wastewater containing metal particles, grease, polishing agents and other chemicals.

In order to meet environmental protection standards and reuse requirements, it is necessary to treat the wastewater generated during the grinding process. After searching, Chinese patent CN110294555A discloses a stainless steel grinding and polishing wastewater treatment device, and CN110282764A discloses a wastewater treatment device after permanent magnet grinding, which involves the treatment of grinding wastewater, but neither effectively treats the grease in the wastewater, and it cannot be directly discharged or reused later.

In order to solve the above problems, we proposed a sewage treatment equipment and a treatment method for grinding work.

Summary of the invention

The purpose of the present invention is to solve the problems in the background technology and to propose a sewage treatment device and a treatment method for grinding work.

In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a sewage treatment equipment for grinding work, comprising a wastewater tank and a clean water tank used in conjunction with a grinding table, a U-shaped purification box is fixed on the upper side of the clean water tank, a wastewater pump connected to the purification box is arranged in the wastewater tank, liquid level sensors are arranged inside both ends of the purification box, a wastewater pipe and a clean water pipe respectively connected to the wastewater tank and the clean water tank are arranged on the grinding table, a liquid pump is arranged in the middle of the wastewater pipe and the clean water pipe, an arc-shaped slide groove is opened in the purification box, an arc plate is slidably arranged in the slide groove, and the upper side wall of the purification box An opening connected to the slide slot is provided, an arc-shaped through-port is provided inside the purification box, an impurity collection box is fixedly provided in the middle of the through-port, a filter cloth is fixedly provided between the outer wall of the impurity collection box and the inner wall of the through-port, a through-slot connected to the interior of the clean water tank is provided on the outer wall, a movable plate is slidably inserted in the through-slot, an adsorption resin filter screen is fixedly embedded at one end of the movable plate located in the clean water tank, the interior of the adsorption resin filter screen is filled with adsorption resin particles, and both ends of the purification box are provided with an oil removal mechanism for adsorbing grease, the oil removal mechanism includes a guide slot, and the ends of the two guide slots are fixedly connected;

A transverse plate is fixedly connected to the outer wall of the purification box, a convex block is fixed at the end of the transverse plate, a tooth plate is slidably sleeved on the convex block, a convex groove matching the convex block is provided on the tooth plate, the upper end of the tooth plate is fixedly connected to the lower side wall of one of the guide grooves, a support plate 1 and a support plate 2 are fixed to the outer wall of the purification box, a motor is fixed to the end of the support plate 1, a gear 1 is fixed to the driving end of the motor, a gear 2 is installed at the end of the support plate 2, the gear 1, the gear 2 and the tooth plate are meshed with each other, the gear 1 is an incomplete gear, and two sawtooth segments are symmetrically provided on its outer wall, and the sawtooth segments are intermittently meshed with the gear 2 and the tooth plate;

A rectangular plate is slidably inserted inside the guide groove, a return spring is fixedly connected between the rectangular plate and the inner wall of the guide groove, a rectangular opening is opened on the rectangular plate, an extrusion piece whose end is located in the rectangular opening is fixed on the outer wall of the purification box, the extrusion piece comprises a rectangular rod at the lower end and a right-angled trapezoidal plate fixed at the upper end of the rectangular rod, the inclined surface of the right-angled trapezoidal plate contacts the inner wall of the rectangular opening, the two extrusion pieces are symmetrically arranged, a connecting plate is fixedly connected to the end of the rectangular plate away from the guide groove, oil-absorbing cotton is fixed to the end of the connecting plate, an extrusion piece located on the outside of the oil-absorbing cotton is fixedly connected to the outer wall of the purification box, the extrusion piece comprises an extrusion groove with a groove opened on the outer wall, and a grease collecting groove is slidably inserted on the outer wall of the extrusion groove.

In the above-mentioned sewage treatment equipment for grinding work, a connecting plate is fixedly embedded on the arc plate, the upper end of the connecting plate is fixed on the outer wall of gear 2, and the lower end of the connecting plate is fixedly connected with a scraper in contact with the filter cloth.

In the above-mentioned sewage treatment equipment used for grinding work, the center of the through port, the chute, and the arc-shaped plate is arranged to coincide with the center of the second gear.

In the above-mentioned sewage treatment equipment used for grinding work, the inner wall of the impurity collection box is provided with a guide slope.

In the above-mentioned sewage treatment equipment used for grinding work, a discharge port connected to the impurity collection box is opened on the outer wall of the clean water tank, a sealing rubber block is slidably inserted in the discharge port, a sealing plate is fixedly connected to the end of the sealing rubber block, a bolt is threadedly connected to the sealing plate, and a threaded hole matching the bolt is opened on the outer wall of the clean water tank.

A method for treating wastewater used in grinding work comprises the following steps:

S1, the waste water generated by the grinding table during the grinding process is collected and discharged to the waste water tank through the waste water pipe for collection, and the clean water at the bottom of the clean water tank is discharged to the grinding table through the clean water pipe for use, and is used for lubrication, cooling and cleaning during the grinding process;

S2, the wastewater in the wastewater tank is led to the purification box, the grease in the wastewater floats on both ends of the purification box, and the solid impurities in the wastewater remain on the filter cloth;

S3, the starting motor drives gear one to rotate. When gear one meshes with gear two, it drives gear two, the connecting plate and the scraper to move to one side. The scraper scrapes the solid particles on the surface of the filter cloth to move. At this time, gear two drives the tooth plate to move downward. The oil-absorbing cotton is inserted into the end of the purification box and contacts the upper surface of the wastewater to absorb the grease on the surface of the wastewater. When gear one rotates to mesh with the tooth plate, it drives the tooth plate to move upward, drives the guide groove to move upward, and the inner wall of the rectangular opening moves along the inclined surface of the right-angled trapezoidal plate, so that the two oil-absorbing cottons move away from each other and are inserted into the extrusion groove. They are squeezed with the inner wall of the extrusion groove, so that the grease adsorbed by the oil-absorbing cotton is squeezed out and falls into the grease collecting groove for collection. At this time, the tooth plate drives gear two to rotate forward, drives the connecting plate and the scraper to move to the other side;

S4, the water filtered by the filter cloth is led out to contact with the adsorption resin filter screen, and the remaining grease, organic matter and metal particles are adsorbed by the adsorption resin particles.

Compared with the existing technology, the advantages of this sewage treatment equipment for grinding work are:

A U-shaped purification box is set up, and the grease in the wastewater floats directly on both ends of the purification box, which is convenient for the oil-absorbing cotton to directly absorb and remove the grease;

Gear 1, gear 2 and a tooth plate are arranged, and the scraper is scraped back and forth along the filter cloth through intermittent meshing of gear 1, tooth plate 2 and the tooth plate, so as to prevent the filter cloth from being blocked by solid impurities;

The tooth plate drives the guide groove to move up and down during the up and down movement. When the guide groove moves up, the right-angle trapezoidal plate squeezes the oil-absorbing cotton to move outward and squeezes against the inner wall of the squeezing groove, so that the grease absorbed by the oil-absorbing cotton is squeezed out and flows into the grease collecting groove for collection;

A collection box is provided. When the scraper moves back and forth, the solid impurities are scraped and fall into the collection box for collection. Subsequently, the sealing rubber block can be pulled out to make the solid impurities in the collection box slide along the guide slope and be guided out to the outside for treatment of the solid impurities.

An adsorption resin filter is set up, and the adsorption resin particles inside it adsorb the remaining grease, organic matter and metal particles in the water after filtering by the filter cloth, further improving the thoroughness of water purification;

In summary, the present invention introduces waste water into the purification box so that the grease naturally floats to the two ends of the purification box, and the grease is adsorbed and discharged by the downward movement of the oil-absorbing cotton. When the guide groove moves upward, the oil-absorbing cotton moves upward and simultaneously moves outward to contact and extrude with the extrusion groove, so that the grease is squeezed and collected. During the up and down movement of the tooth plate, the scraper swings left and right synchronously, scraping impurities on the surface of the filter cloth to move, thereby avoiding the natural distribution of impurities and clogging the filter cloth, so that the water body can pass through the filter cloth smoothly for filtering.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of a sewage treatment device for grinding work proposed by the present invention;

FIG2 is a schematic structural diagram of a sewage treatment device for grinding work proposed by the present invention from another angle;

FIG3 is a schematic structural diagram of a purification tank and a clean water tank in a sewage treatment device for grinding work proposed by the present invention when cut apart;

FIG4 is an enlarged view of the structure of part A in FIG3 ;

FIG5 is a schematic structural diagram of a sewage treatment device for grinding work proposed by the present invention and used in conjunction with a grinding table.

In the figure: 1 waste water tank, 2 purification tank, 3 clean water tank, 4 support plate 1, 5 gear 1, 6 gear 2, 7 support plate 2, 8 horizontal plate, 9 tooth plate, 10 slide groove, 11 arc plate, 12 connecting plate, 13 collecting box, 14 through port, 15 scraper, 16 moving plate, 17 adsorption resin filter, 18 sealing rubber block, 19 sealing plate, 20 bolt, 21 guide slope, 22 guide groove, 23 rectangular plate, 24 rectangular port, 25 extrusion part, 26 connecting plate, 27 oil absorption cotton, 28 extrusion groove, 29 grease collection groove, 30 grinding table, 31 waste water pipe, 32 clean water pipe, 33 motor.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

1 to 5, a sewage treatment equipment for grinding work comprises a wastewater tank 1 and a clean water tank 3 used in conjunction with a grinding table 30, a purification box 2 arranged in a U shape is fixed on the upper side of the clean water tank 3, a wastewater pump connected to the purification box 2 is arranged in the wastewater tank 1, and liquid level sensors are arranged inside both ends of the purification box 2, a wastewater pipe 31 and a clean water pipe 32 connected to the wastewater tank 1 and the clean water tank 3 respectively are arranged on the grinding table 30, and liquid pumps are arranged in the middle of the wastewater pipe 31 and the clean water pipe 32, and wastewater generated by the grinding table 30 is introduced into the wastewater tank 1 through the liquid pump for collection, and the wastewater pump guides the wastewater into the purification box 2 for treatment, and after the wastewater in the purification box 2 reaches the height of the liquid level sensor, the liquid level sensor sends a signal to the controller to control the wastewater pump to be turned off, wherein the liquid level height of the wastewater in the purification box 2 should correspond to the lowest height of the oil-absorbing cotton 27, so as to ensure that the subsequent oil-absorbing cotton 27 can absorb and remove grease on the surface of the wastewater.

An arc-shaped chute 10 is provided in the purification box 2, and an arc-shaped plate 11 is slidably provided in the chute 10. To ensure the sealing between the arc-shaped plate 11 and the chute 10, a sliding sealing ring can be fixedly sleeved on the outer wall of the arc-shaped plate 11 to prevent wastewater from seeping out from the connection between the chute 10 and the arc-shaped plate 11.

The upper side wall of the purification box 2 is provided with an opening connected to the chute 10, the interior of the purification box 2 is provided with an arc-shaped through-port 14, the middle of the through-port 14 is fixedly provided with an impurity collection box 13, the inner wall of the impurity collection box 13 is provided with a guide slope 21, a filter cloth is fixedly provided between the outer wall of the impurity collection box 13 and the inner wall of the through-port 14, the outer wall of the clean water tank 3 is provided with a through-slot connected to the interior thereof, a movable plate 16 is slidably inserted in the through-slot, the end of the movable plate 16 can be fixed to the outer wall of the clean water tank 3 by screws, and the movable plate 16 can be fixed to the outer wall of the clean water tank 3 by screws. One end of the plate 16 located in the clean water tank 3 is fixedly embedded with an adsorption resin filter screen 17, and the interior of the adsorption resin filter screen 17 is filled with adsorption resin particles. Both ends of the purification box 2 are provided with an oil removal mechanism for adsorbing grease, and the oil removal mechanism includes a guide groove 22. The ends of the two guide grooves 22 are fixedly connected. The surface of the filter cloth should be highly consistent with the surface of the impurity collection box 13. The wastewater is sequentially removed from fixed impurities and grease in the purification box 2, and the untreated grease and impurities in the water are adsorbed and removed again by the adsorption resin particles after passing through the filter cloth.

A transverse plate 8 is fixedly connected to the outer wall of the purification box 2, and a convex block is fixed at the end of the transverse plate 8. A tooth plate 9 is slidably sleeved on the convex block. A convex groove matching the convex block is provided on the tooth plate 9. The upper end of the tooth plate 9 is fixedly connected to the lower side wall of one of the guide grooves 22. A support plate 1 4 and a support plate 2 7 are fixed to the outer wall of the purification box 2. A motor 33 is fixed to the end of the support plate 1 4. A gear 1 5 is fixed to the driving end of the motor 33. A gear 2 6 is installed at the end of the support plate 2 7. The gear 1 5, the gear 2 6, and the tooth plate 9 are meshed with each other. The gear 1 5 is an incomplete gear, and two sawtooth segments are symmetrically arranged on its outer wall. The sawtooth segments are intermittently meshed with the gear 2 6 and the tooth plate 9. A rectangular plate 23 is slidably inserted inside the guide groove 22. A return spring is fixedly connected between the rectangular plate 23 and the inner wall of the guide groove 22. A rectangular opening 24 is opened on the rectangular plate 23. An extrusion piece 25 whose end is located in the rectangular opening 24 is fixed on the outer wall of the purification box 2. The extrusion piece 25 includes a rectangular rod at the lower end and a right-angled trapezoidal plate fixed at the upper end of the rectangular rod. The inclined surface of the right-angled trapezoidal plate contacts the inner wall of the rectangular opening 24. The two extrusion pieces 25 are symmetrically arranged. A connecting plate 26 is fixedly connected to the end of the rectangular plate 23 away from the guide groove 22. An oil-absorbing cotton 27 is fixed to the end of the connecting plate 26. An extrusion piece located outside the oil-absorbing cotton 27 is fixedly connected to the outer wall of the purification box 2. The extrusion piece includes an extrusion groove 28 with a groove opened on the outer wall. A grease collecting groove 29 is slidably inserted into the outer wall of the extrusion groove 28.

The starting motor 33 drives the gear 1 5 to rotate. When the gear 1 5 is meshed with the gear 2 6, the gear 2 6, the connecting plate 12 and the scraper 15 are driven to move to one side. The scraper 15 scrapes the solid particles on the surface of the filter cloth to move, so as to prevent the accumulation of solid particles from affecting the water passing through the filter cloth. In the process of the movement of the solid particles, due to the sedimentation of the solid particles themselves, when the scraper 15 is pushed to the movement process, it will settle to the bottom of the collection box 13 for collection. At this time, the gear 2 6 drives the tooth plate 9 to move downward, and the oil-absorbing cotton 27 is inserted into the end of the purification box 2, and contacts with the upper surface of the wastewater to absorb the grease on the surface of the wastewater. When the gear 1 5 rotates to mesh with the tooth plate 9, it drives the tooth plate 9 to move upward. The guide groove 22 moves upward, and the inner wall of the rectangular opening 24 moves along the inclined surface of the right-angled trapezoidal plate, so that the two oil-absorbing cottons 27 move away from each other. The oil-absorbing cotton 27 is inserted into the extrusion groove 28 and squeezed with the inner wall of the extrusion groove 28, so that the adsorbed grease of the oil-absorbing cotton 27 is squeezed out and falls into the grease collecting groove 29 for collection. At this time, the tooth plate 9 drives the gear 2 6 to rotate forward, driving the connecting plate 12 and the scraper 15 to move to the other side. The back and forth movement of the scraper 15 can scrape the solid impurities on the surface of the filter cloth, so that the solid impurities on both sides of the scraper 15 can fall into the collection box 13. When the tooth plate 9 moves downward, under the reverse elastic force of the reset spring, the rectangular plate 23 moves into the guide groove 22.

A connecting plate 12 is fixedly embedded on the arc plate 11, the upper end of the connecting plate 12 is fixed on the outer wall of the gear 2 6, and the lower end of the connecting plate 12 is fixedly connected with a scraper 15 in contact with the filter cloth. The center of the through opening 14, the chute 10, and the arc plate 11 is arranged to coincide with the center of the gear 2 6, ensuring that when the gear 2 6 drives the connecting plate 12 to rotate, the arc plate 11 can move along the chute 10 and the scraper 15 can move along the surface of the filter cloth.

A discharge port connected to the impurity collection box 13 is provided on the outer wall of the clean water tank 3, and a sealing rubber block 18 is slidably inserted in the discharge port. A sealing plate 19 is fixedly connected to the end of the sealing rubber block 18, and a bolt 20 is threadedly connected to the sealing plate 19. A threaded hole matching the bolt 20 is provided on the outer wall of the clean water tank 3.

A method for treating wastewater used in grinding work comprises the following steps:

S1, the waste water generated by the grinding table 30 during the grinding process is collected and discharged to the waste water tank 1 through the waste water pipe 31 for collection, and the clean water at the bottom of the clean water tank 3 is discharged to the grinding table 30 through the clean water pipe 32 for use, and is used for lubrication, cooling and cleaning during the grinding process;

S2, the wastewater in the wastewater tank 1 is led to the purification tank 2, the grease in the wastewater floats on both ends of the purification tank 2, and the solid impurities in the wastewater remain on the filter cloth;

S3, start the motor 33 to drive the gear 1 5 to rotate. When the gear 1 5 is meshed with the gear 2 6, it drives the gear 2 6, the connecting plate 12 and the scraper 15 to move to one side. The scraper 15 scrapes the solid particles on the surface of the filter cloth to move. At this time, the gear 2 6 drives the tooth plate 9 to move downward, and the oil-absorbing cotton 27 is inserted into the end of the purification box 2, contacts the upper surface of the wastewater, and absorbs the grease on the surface of the wastewater. When the gear 1 5 is rotated to mesh with the tooth plate 9, it drives the tooth plate 9 to move upward, drives the guide groove 22 to move upward, and the inner wall of the rectangular opening 24 moves along the inclined surface of the right-angled trapezoidal plate, so that the two oil-absorbing cottons 27 move away from each other and are inserted into the extrusion groove 28. They are squeezed with the inner wall of the extrusion groove 28, so that the adsorbed grease of the oil-absorbing cotton 27 is squeezed out and falls into the grease collecting groove 29 for collection. At this time, the tooth plate 9 drives the gear 2 6 to rotate forward, drives the connecting plate 12 and the scraper 15 to move to the other side;

S4, the water filtered by the filter cloth is led out to contact the adsorption resin filter 17, and the remaining grease, organic matter and metal particles are adsorbed by the adsorption resin particles.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A sewage treatment device for grinding work, comprising a wastewater tank (1) and a clean water tank (3) used in conjunction with a grinding table (30), characterized in that a purification box (2) arranged in a U shape is fixed on the upper side of the clean water tank (3), a wastewater pump connected to the purification box (2) is arranged in the wastewater tank (1), and liquid level sensors are arranged inside both ends of the purification box (2), a wastewater pipe (31) and a clean water pipe (32) respectively connected to the wastewater tank (1) and the clean water tank (3) are arranged on the grinding table (30), and a liquid pump is arranged in the middle of the wastewater pipe (31) and the clean water pipe (32), and an arc-shaped slide groove (10) is opened in the purification box (2), and an arc-shaped plate (10) is slidably arranged in the slide groove (10) 1), an opening communicating with the slide groove (10) is provided on the upper side wall of the purification box (2), an arc-shaped through-port (14) is provided inside the purification box (2), an impurity collection box (13) is fixedly provided in the middle of the through-port (14), a filter cloth is fixedly provided between the outer wall of the impurity collection box (13) and the inner wall of the through-port (14), a through-groove communicating with the interior of the clean water box (3) is provided on the outer wall of the clean water box (3), a movable plate (16) is slidably inserted in the through-groove, an end of the movable plate (16) located inside the clean water box (3) is fixedly embedded with an adsorption resin filter screen (17), the interior of the adsorption resin filter screen (17) is filled with adsorption resin particles, and both ends of the purification box (2) are provided with an oil removal mechanism for adsorbing grease. 2. A sewage treatment equipment for grinding work according to claim 1, characterized in that a transverse plate (8) is fixedly connected to the outer wall of the purification box (2), a convex block is fixed at the end of the transverse plate (8), a tooth plate (9) is slidably sleeved on the convex block, a convex groove matching the convex block is provided on the tooth plate (9), the upper end of the tooth plate (9) is fixedly connected to the lower side wall of one of the guide grooves (22), a support plate 1 (4) and a support plate 2 (7) are fixed to the outer wall of the purification box (2), a motor (33) is fixed at the end of the support plate 1 (4), a gear 1 (5) is fixed at the driving end of the motor (33), and a gear 2 (6) is installed at the end of the support plate 2 (7), the gear 1 (5), the gear 2 (6) and the tooth plate (9) are meshed with each other, the gear 1 (5) is an incomplete gear, and its outer wall is symmetrically provided with two sawtooth segments, and the sawtooth segments are intermittently meshed with the gear 2 (6) and the tooth plate (9). 3. A sewage treatment device for grinding work according to claim 2, characterized in that the oil removal mechanism comprises a guide groove (22), the ends of the two guide grooves (22) are fixedly connected, a rectangular plate (23) is slidably inserted inside the guide groove (22), a return spring is fixedly connected between the rectangular plate (23) and the inner wall of the guide groove (22), a rectangular opening (24) is opened on the rectangular plate (23), an extrusion piece (25) whose end is located in the rectangular opening (24) is fixed to the outer wall of the purification box (2), and the extrusion piece (25) includes a rectangular lower end. The rod and a right-angled trapezoidal plate fixed on the upper end of the rectangular rod, the inclined surface of the right-angled trapezoidal plate contacts the inner wall of the rectangular opening (24), the two extrusion pieces (25) are symmetrically arranged, the end of the rectangular plate (23) away from the guide groove (22) is fixedly connected to a connecting plate (26), the end of the connecting plate (26) is fixed with oil-absorbing cotton (27), the outer wall of the purification box (2) is fixedly connected with an extrusion piece located outside the oil-absorbing cotton (27), the extrusion piece includes an extrusion groove (28) with a groove on the outer wall, and the outer wall of the extrusion groove (28) is slidably inserted with a grease collecting groove (29). 4. A sewage treatment device for grinding work according to claim 3, characterized in that a connecting plate (12) is fixedly embedded on the arc plate (11), the upper end of the connecting plate (12) is fixed on the outer wall of the gear 2 (6), and the lower end of the connecting plate (12) is fixedly connected with a scraper (15) in contact with the filter cloth. 5. The sewage treatment equipment for grinding work according to claim 1, characterized in that the center of the through opening (14), the chute (10), and the arc plate (11) is arranged to coincide with the center of the gear 2 (6). 6. The sewage treatment equipment for grinding work according to claim 1, characterized in that the inner wall of the impurity collection box (13) is provided with a guide slope (21). 7. A sewage treatment device for grinding work according to claim 1, characterized in that a discharge port connected to the impurity collection box (13) is opened on the outer wall of the clean water tank (3), a sealing rubber block (18) is slidably inserted in the discharge port, a sealing plate (19) is fixedly connected to the end of the sealing rubber block (18), a bolt (20) is threadedly connected to the sealing plate (19), and a threaded hole matching the bolt (20) is opened on the outer wall of the clean water tank (3). 8. A method for treating wastewater using the wastewater treatment equipment for grinding work as claimed in claim 4, comprising the following steps: S1, waste water generated by the grinding table (30) during the grinding process is collected and discharged into the waste water tank (1) through the waste water pipe (31) for collection, and clean water at the bottom of the clean water tank (3) is discharged to the grinding table (30) through the clean water pipe (32) for use, and is used for lubrication, cooling and cleaning during the grinding process; S2, the wastewater in the wastewater tank (1) is discharged into the purification tank (2), the grease in the wastewater floats on both ends of the purification tank (2), and the solid impurities in the wastewater remain on the filter cloth; S3, the motor (33) is started to drive the gear 1 (5) to rotate. When the gear 1 (5) meshes with the gear 2 (6), the gear 2 (6), the connecting plate (12) and the scraper (15) are driven to move to one side. The scraper (15) scrapes the solid particles on the surface of the filter cloth to move. At this time, the gear 2 (6) drives the tooth plate (9) to move downward. The oil-absorbing cotton (27) is inserted into the end of the purification box (2) and contacts the upper surface of the wastewater to absorb the grease on the surface of the wastewater. The gear 1 (5) rotates to the tooth plate (9). When meshing, the tooth plate (9) is driven to move upward, driving the guide groove (22) to move upward, and the inner wall of the rectangular opening (24) moves along the inclined surface of the right-angled trapezoidal plate, so that the two oil-absorbing cottons (27) move away from each other and are inserted into the extrusion groove (28), and are squeezed with the inner wall of the extrusion groove (28), so that the grease absorbed by the oil-absorbing cotton (27) is squeezed out and falls into the grease collecting groove (29) for collection. At this time, the tooth plate (9) drives the gear 2 (6) to rotate forward, driving the connecting plate (12) and the scraper (15) to move to the other side; S4, the water filtered by the filter cloth is led out to contact with the adsorption resin filter (17), and the remaining grease, organic matter and metal particles are adsorbed by the adsorption resin particles.