A cold rolling wastewater treatment equipment

Abstract

The invention belongs to the technical field of wastewater treatment, and specifically relates to a cold rolling wastewater treatment device, comprising an air flotation tank, a collecting tank being arranged on the left side of the air flotation tank, and a cleaning mechanism being arranged on the upper side of the air flotation tank; the cleaning mechanism comprises a mounting bar arranged on the upper side of the air flotation tank, both left and right ends of the mounting bar are rotatably equipped with transmission wheels, a transmission belt is arranged between the two transmission wheels, a first servo motor is installed on the mounting bar, an output shaft of the first servo motor is transmission-connected with the transmission wheel, the transmission belt is connected with two symmetrically arranged connecting pieces, and both connecting pieces are equipped with scrapers; the invention can not only realize the cleaning of impurities on the surface of sewage, but also push the impurities to the collecting tank through the scraper, so as to effectively remove suspended matter and colloid in the sewage; it can also clean the impurities attached to the inner wall of the air flotation tank, and change the state of the mounting bar so that it abuts against the side wall of the air flotation tank, so as to scrape and clean the impurities on the inner wall.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to cold rolling wastewater treatment equipment. Background Art

[0002] The cold rolling mills in the steel industry are equipped with pickling and continuous rolling units, continuous annealing units, skin-pass units, color coating units, galvanizing units, etc. These units will produce oily wastewater during the production process.

[0003] The treatment process of oily wastewater is usually to remove floating oil through flotation, and then discharge it into the discharge pool after pH adjustment and biochemical treatment. When the existing flotation water treatment equipment purifies wastewater, impurities in the wastewater will adhere to the side wall of the equipment. The long-term accumulation of impurities will affect the purification efficiency of the flotation water treatment equipment. For this reason, we provide a cold rolling wastewater treatment equipment to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a cold rolling wastewater treatment device to solve the problems raised in the background technology.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A cold rolling wastewater treatment device comprises an air flotation tank, a collecting tank is provided on the left side of the air flotation tank, and a cleaning mechanism is provided on the upper side of the air flotation tank;

[0007] The cleaning mechanism comprises a mounting bar arranged on the upper side of the flotation tank, the left and right ends of the mounting bar are both rotatably equipped with transmission wheels, a transmission belt is arranged between the two transmission wheels, the mounting bar is equipped with a first servo motor, the output shaft of the first servo motor is connected to the transmission wheel, the transmission belt is connected with two symmetrically arranged connecting pieces, and the two connecting pieces are both equipped with scrapers;

[0008] Electric slide rails are provided on both the front and rear sides of the bottom of the flotation pool, and the electric slide rails are slidably provided with a cylinder, and the output shaft of the cylinder is connected to the slide rail, and a slide rod is slidably provided in the slide rail, and the mounting bar is provided with a first connecting groove, and a first connecting block matching the first connecting groove is fixed to the end of the slide rod, and the slide rod is provided with a rotating assembly, and the rotating assembly can drive the mounting bar to rotate ninety degrees, and a U-shaped frame is fixed to the upper end of the slide rail, and a second servo motor is installed on the upper side of the U-shaped frame, and the output shaft of the second servo motor is connected to a connecting shaft, and a U-shaped seat is fixed to the lower side of the connecting shaft, and a connecting assembly is provided between the U-shaped seat and the left end of the mounting bar.

[0009] The rotating assembly includes a gear ring rotatably assembled at the end of the slide rail, the gear ring is sleeved on the outside of the slide rod, a plurality of limit grooves are opened on the outside of the slide rod, a limit block matching the limit grooves is fixed to the inside of the gear ring, the slide rail is slidably assembled with a rack meshing with the gear ring, push rods are fixed on the left and right sides of the rack, a bottom plate is fixed on the upper end of the cylinder, and vertical rods located on the left and right sides of the rack are fixed on the bottom plate, both of the vertical rods are provided with vertical grooves, and the ends of the two push rods are respectively abutted against the two vertical grooves, a convex strip is fixed to the lower side of one of the vertical grooves, and a groove matching the convex strip is opened in the other vertical groove.

[0010] A guide rail is fixed on the upper side of the bottom plate, a through groove is provided on the side wall of the rail, a guide block is fixed on the slide rod, the guide block passes through the through groove and is slidably connected to the guide rail, the guide rail is composed of a vertical rail and an inclined rail, the vertical rail is fixed at the upper end of the inclined rail, and the upper end height of the inclined rail is lower than the upper end height of the convex strip.

[0011] The connecting assembly includes an installation cavity opened at the lower end of the U-shaped frame, hydraulic oil is arranged in the installation cavity, a sealing block is provided in the installation cavity for sealing and sliding, a trapezoidal block is connected to the lower end of the sealing block, the lower end of the trapezoidal block extends into the slide rail and abuts against the end of the slide rod, a first spring is provided on the upper side of the sealing block, a cavity is opened on one side of the U-shaped seat, a piston rod is provided in the cavity for sealing and sliding, a second connecting block is connected to the end of the piston rod, a second connecting groove matching the second connecting block is opened at the end of the installation strip, an annular cavity located outside the connecting shaft is opened in the middle part of the U-shaped frame, the installation cavity is connected to the annular cavity through a pipeline, the connecting shaft is opened with a channel, and the channel connects the annular cavity with the cavity.

[0012] The connecting member includes a rectangular shell connected to the transmission belt, a slider is slidably provided in the rectangular shell, a second spring is provided on the side of the slider away from the mounting strip, a sleeve is rotatably assembled on the rectangular shell, the end of the sleeve is connected to the scraper, a circular rod extending into the sleeve is fixed to the slider, a spiral groove is provided on the side wall of the sleeve, a fixing block matching the spiral groove is fixed to the circular rod, and a pushing block abutting against the mounting strip is fixed to the slider, and inclined surfaces are processed on the front and rear sides of the pushing block.

[0013] The scraper is composed of a fixed seat and a scraper blade. The fixed seat is connected to the sleeve. The scraper blade is slidably arranged in the fixed seat. An elastic component is arranged between the scraper blade and the fixed seat.

[0014] The present invention can not only clean impurities on the surface of sewage, but also push the impurities to the collection tank through the scraper to effectively remove suspended matter and colloids in the sewage; it can also clean impurities attached to the inner wall of the flotation tank by changing the state of the mounting strip so that it abuts against the side wall of the flotation tank, thereby scraping and cleaning the impurities on the inner wall.

[0015] The design of the cleaning mechanism allows it to change its state according to the use requirements. It can be used as a cleaning tool, and can also be used as a stirring device after adding flocculants and coagulants to promote the full mixing of sewage and chemicals and improve the efficiency of the flocculation reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a cold rolling wastewater treatment equipment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the cleaning mechanism of the present invention;

[0019] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0020] Figure 4 The cross-sectional structure of the cleaning mechanism of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 5 for Figure 4 A schematic diagram of the structure enlarged at B in the middle;

[0022] Figure 6 The cross-sectional structure of the cleaning mechanism of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 7 for Figure 6 A schematic diagram of the structure enlarged at C in the middle;

[0024] Figure 8 for Figure 6 A schematic diagram of the structure at D in the middle is enlarged;

[0025] Fig. 9 It is a partial structural schematic diagram of the cleaning mechanism of the present invention;

[0026] Fig.10 This is a schematic diagram of the structure of another state of an embodiment of a cold rolling wastewater treatment equipment of the present invention.

[0027] The main component symbols are described as follows:

[0028] flotation tank 1, collecting tank 11, mounting bar 2, first connecting groove 201, transmission wheel 21, transmission belt 22, first servo motor 23, connecting piece 24, scraper 25, fixing seat 251, scraper 252, electric slide rail 3, cylinder 31, slide rail 32, through groove 321, slide rod 33, guide block 331, first connecting block 34, U-shaped frame 35, second servo motor 36, connecting shaft 37, U-shaped seat 38, gear ring 4, rack 41, push rod 42, bottom plate 43, vertical rod 44, vertical groove 45, convex strip 46, groove 47, guide rail 48, vertical rail 481, inclined rail 482, installation cavity 5, sealing block 51, trapezoidal block 52, first spring 53, cavity 54, piston rod 55, second connecting block 56, second connecting groove 57, annular cavity 58, rectangular shell 6, slider 61, second spring 62, sleeve 63, circular rod 64, spiral groove 65, fixing block 66, pushing block 67. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] like Figure 1-10 As shown, a cold rolling wastewater treatment device of the present invention comprises an air flotation tank 1, a collecting tank 11 is provided on the left side of the air flotation tank 1, and is characterized in that: a cleaning mechanism is provided on the upper side of the air flotation tank 1;

[0031] The cleaning mechanism includes a mounting bar 2 disposed on the upper side of the air flotation tank 1, and both left and right ends of the mounting bar 2 are rotatably equipped with transmission wheels 21, and a transmission belt 22 is provided between the two transmission wheels 21. The mounting bar 2 is equipped with a first servo motor 23, and the output shaft of the first servo motor 23 is transmission-connected to the transmission wheel 21. The transmission belt 22 is connected to two symmetrically arranged connecting members 24, and the two connecting members 24 are both equipped with scrapers 25;

[0032] Electric slide rails 3 are provided on both the front and rear sides of the bottom of the flotation tank 1. The electric slide rails 3 are slidably provided with a cylinder 31. The output shaft of the cylinder 31 is connected to the slide rail 32. A slide rod 33 is slidably provided in the slide rail 32. The mounting bar 2 is provided with a first connecting groove 201. A first connecting block 34 matching the first connecting groove 201 is fixed to the end of the slide rod 33. The slide rod 33 is provided with a rotating assembly, and the rotating assembly can drive the mounting bar 2 to rotate ninety degrees. A U-shaped frame 35 is fixed to the upper end of the slide rail 32. A second servo motor 36 is installed on the upper side of the U-shaped frame 35. The output shaft of the second servo motor 36 is connected to a connecting shaft 37. A U-shaped seat 38 is fixed to the lower side of the connecting shaft 37. A connecting assembly is provided between the U-shaped seat 38 and the left end of the mounting bar 2.

[0033] In the initial state, the mounting bar 2 is in a horizontal state, and the scraper 25 is perpendicular to the mounting bar 2. When in use, the sewage is injected into the flotation tank 1, and flocculants and coagulants are added. After stirring, an effective flocculation reaction occurs, and then clean water is added to the air dissolving tank. The pressure in the air dissolving tank reaches 0.3-0.55MPa through a pressure pump. At the same time, compressed air is injected into the air dissolving tank to make it supersaturated, and then the pressure is instantly reduced. The air originally dissolved in the water is suddenly released, and a large number of fine bubbles are generated. The fine bubbles are passed into the flotation tank 1, so that the fine particles such as suspended matter and colloids in the sewage in the flotation tank 1 adhere to the bubbles and rise to the water surface with the bubbles. This technology is a conventional technical means in the field of this technology, so it will not be repeated here.

[0034] The first servo motor 23 in the mounting bar 2 is started, and the first servo motor 23 drives the transmission wheel 21 to rotate, and then drives the transmission belt 22 to move, and then drives the two scrapers 25 to move through the connecting piece 24. When the scrapers 25 are located at the lower side of the mounting bar 2, the impurities on the upper side of the sewage are pushed to the collection tank 11, so as to achieve the purpose of removing the impurities;

[0035] When the air flotation water treatment equipment is purifying sewage, impurities in the sewage will adhere to the inner wall of the air flotation tank 1. The long-term accumulation of impurities will affect the purification efficiency of the air flotation water treatment equipment. Therefore, when impurities adhere to the inner wall of the air flotation tank 1, they need to be cleaned.

[0036] The cylinder 31 drives the slide rail 32 to move downward, and the mounting bar 2 can be driven to rotate ninety degrees through the rotating assembly, so that the mounting bar 2 will be in a vertical state, and its upper end is located in the U-shaped seat 38 and connected to the U-shaped seat 38 through the connecting assembly. At the same time, the slide rod 33 slides into the slide rail 32, driving the first connecting block 34 to disengage from the connecting groove 201 and not be connected to the mounting bar 2. The connecting member 24 drives the scraper 25 to rotate, so that the scraper 25 and the mounting bar 2 are parallel to each other and are in the same horizontal plane. Fig.10 As shown, at this time, the second servo motor 36 is started, and the U-shaped seat 38 is driven to rotate through the connecting shaft 37, so that the mounting bar 2 can be driven to rotate in a vertical state inside the flotation tank 1. The scraper 25 can abut against the side wall of the flotation tank 1 to clean up the impurities attached to the inner wall of the flotation tank 1, and the flotation tank 1 is rinsed with clean water from the outside, and the impurities and sewage are discharged from the flotation tank 1 together;

[0037] Furthermore, after adding flocculants and coagulants to the sewage, the state of the cleaning mechanism of the present application can also be changed, so that the mounting bar 2 is located in the flotation tank 1 in a vertical state as a whole, and the mounting bar 2 is driven by the electric slide rail 3 to slide left and right as a whole, so as to stir the sewage, so that the sewage is fully mixed with the flocculants and coagulants, and an effective flocculation reaction is carried out;

[0038] Therefore, the present application can change the state of the mounting strip 2 according to the use requirements, which can not only clean the impurities on the upper side of the sewage, but also clean the impurities attached to the side wall of the flotation tank 1, and has more comprehensive functions and strong practicality.

[0039] The rotating assembly includes a slide rail 32 end rotatably equipped with a gear ring 4, the gear ring 4 is sleeved on the outside of the slide rod 33, the outside of the slide rod 33 is provided with a plurality of limit grooves, the inner side of the gear ring 4 is fixed with a limit block matching the limit grooves, the slide rail 32 is slidably equipped with a rack 41 meshing with the gear ring 4, push rods 42 are fixed on the left and right sides of the rack 41, a bottom plate 43 is fixed to the upper end of the cylinder 31, and vertical rods 44 located on the left and right sides of the rack 41 are fixed to the bottom plate 43, and the two vertical rods 44 are both provided with vertical grooves 45, and the ends of the two push rods 42 are respectively abutted against the two vertical grooves 45, one of the vertical grooves 45 is fixed with a convex strip 46 on the lower side, and the other vertical groove 45 is provided with a groove 47 matching the convex strip 46.

[0040] A guide rail 48 is fixed on the upper side of the bottom plate 43, a through slot 321 is provided on the side wall of the rail 32, a guide block 331 is fixed to the slide rod 33, the guide block 331 passes through the through slot 321 and is slidably connected to the guide rail 48, the guide rail 48 is composed of a vertical rail 481 and an inclined rail 482, the vertical rail 481 is fixed at the upper end of the inclined rail 482, and the upper end height of the inclined rail 482 is lower than the upper end height of the protruding strip 46.

[0041] The connecting component includes an installation cavity 5 opened at the lower end of the U-shaped frame 35, and hydraulic oil is arranged in the installation cavity 5. A sealing block 51 is provided in the installation cavity 5 for sealing and sliding. A trapezoidal block 52 is connected to the lower end of the sealing block 51. The lower end of the trapezoidal block 52 extends into the slide rail 32 and abuts against the end of the slide rod 33. A first spring 53 is provided on the upper side of the sealing block 51. A cavity 54 is opened on one side of the U-shaped seat 38. A piston rod 55 is sealed and slidably arranged in the cavity 54. A second connecting block 56 is connected to the end of the piston rod 55. A second connecting groove 57 matching the second connecting block 56 is opened at the end of the installation strip 2. An annular cavity 58 located on the outside of the connecting shaft 37 is opened in the middle of the U-shaped frame 35. The installation cavity 5 is connected to the annular cavity 58 through a pipeline. The connecting shaft 37 is opened with a channel, and the channel connects the annular cavity 58 with the cavity 54.

[0042] The connecting member 24 includes a rectangular shell 6 connected to the transmission belt 22, a slider 61 is slidably provided in the rectangular shell 6, a second spring 62 is provided on the side of the slider 61 away from the mounting strip 2, a sleeve 63 is rotatably mounted on the rectangular shell 6, an end of the sleeve 63 is connected to the scraper 25, a circular rod 64 extending into the sleeve 63 is fixed to the slider 61, a spiral groove 65 is provided on the side wall of the sleeve 63, a fixing block 66 matching the spiral groove 65 is fixed to the circular rod 64, a pushing block 67 abutting against the mounting strip 2 is fixed to the slider 61, and the front and rear sides of the pushing block 67 are processed with inclined surfaces.

[0043] In the initial state, the mounting bar 2 is in a horizontal state. At this time, the two first connecting blocks 34 are located in the first connecting groove 201 to fix the position of the mounting bar 2. At the same time, the first connecting block 34 blocks the first connecting groove 201. When the scraper 25 moves under the drive of the transmission belt 22, the push block 67 abuts against the mounting bar 2. When the push block 67 moves to the first connecting groove 201, it abuts against the first connecting block 34, so that the position of the push block 67 relative to the rectangular shell 6 does not change, and the scraper 25 always maintains a horizontal state.

[0044] When the state of the mounting strip 2 is changed, the position of the scraper 25 is controlled by the first servo motor 23 to be in the middle of the upper and lower sides of the mounting strip 2, that is, at this time, the push block 67 abuts against the first connecting block 34, and then the cylinder 31 is started to drive the slide rail 32 to move downward. When the slide rail 32 moves downward, the push rods 42 at both ends of the rack 41 move downward along the vertical groove 45 of the vertical rod 44, and the push rod 42 abuts against the convex strip 46, pushing the position of the rack 41 to change, and then through the engagement with the gear ring 4, the slide rod 33 is driven to rotate, and the slide rod 33 drives the mounting strip 2 to rotate ninety degrees, so that the mounting strip 2 is in a vertical state at this time, and at the same time, the upper end of the mounting strip 2 is located inside the U-shaped seat 38, and the second connecting groove 57 provided therein is aligned with the second connecting block 56;

[0045] The slide rail 32 continues to move downward, and the guide block 331 will enter the inclined rail 482 from the vertical rail 481, and the slide rod 33 will be driven to slide in the slide rail 32 through the guide block 331. When the slide rod 33 slides, it will first contact the trapezoidal block 52 and push the trapezoidal block 52 to move upward. The trapezoidal block 52 then drives the sealing block 51 to move upward, pushing the hydraulic oil in the installation cavity 5 into the annular cavity 58 through the pipeline, and then enters the cavity 54 from the through groove, pushing the piston rod 55 in the cavity 54 to move, and the piston rod 55 drives the second connecting block 56 to enter the second connecting groove 57, so that the U-shaped seat 38 is aligned with the installation bar 2. The first connecting block 34 will be out of the first connecting groove 201 of the mounting bar 2, and the sliding bar 33 will be disconnected from the mounting bar 2. At the same time, the pushing block 67 will lose the contact with the first connecting block 34, and the sliding block 61 will be pushed downward under the elastic force of the second spring 62, thereby driving the circular rod 64 to move downward, and the fixing block 66 fixed to the circular rod 64 will slide downward in the spiral groove 65, so that the sleeve 53 will rotate, and the scraper 25 will rotate to a state parallel to the mounting bar 2; finally, the sliding bar 33 is completely retracted into the sliding rail 32, and will not hinder the rotation of the mounting bar 2;

[0046] Therefore, the second servo motor 36 can drive the scraper 25 of the mounting bar 2 to rotate until it contacts the front and rear side walls of the flotation pool 1, and then drive the mounting bar 2 to slide left and right through the electric slide rail 3, so that the scraper 25 can clean the front and rear side walls of the flotation pool 1. When the mounting bar 2 is at the left and right end positions of the flotation pool 1, the second servo motor 36 is started to drive the mounting bar 2 to rotate continuously as a whole, so that the scraper 25 can clean the left and right side walls of the flotation pool 1.

[0047] The annular cavity 58 is filled with hydraulic oil. When the connecting shaft 37 rotates, the passage opened therein is always connected with the annular cavity 58, thereby ensuring the stable delivery of the hydraulic oil.

[0048] When the mounting bar 2 is restored to its initial state, the second servo motor 36 is used to drive the first connection groove 201 of the mounting bar 2 to be at the front and rear sides, and then the cylinder 31 drives the slide rail 32 to move upward, so that the mounting bar 2 can be restored to its initial state.

[0049] The servo motor can be used to accurately control the position of the scraper 25 and the mounting bar 2 to achieve the state change of the mounting bar 2;

[0050] Furthermore, the transmission method of the transmission wheel 21 and the transmission belt 22 can be a transmission method of a chain and a sprocket.

[0051] The scraper 25 is composed of a fixed seat 251 and a scraper blade 252. The fixed seat 251 is connected to the sleeve 63. The scraper blade 252 is slidably arranged in the fixed seat 251. An elastic component is arranged between the scraper blade 252 and the fixed seat 251. Such a design allows the scraper blade 252 to slide relative to the fixed seat 251. When the mounting bar 2 is at the left and right end positions of the flotation tank 1, the second servo motor 36 is started to drive the mounting bar 2 to rotate continuously as a whole. When the scraper 25 is able to clean the left and right side walls of the flotation tank 1, the telescopic scraper 25 can fully contact the side walls of the flotation tank 1, thereby achieving a better cleaning effect on the flotation tank 1.

[0052] The elastic component can be realized by a spring sheet.

[0053] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A cold rolling wastewater treatment equipment, comprising an air flotation tank, wherein a collecting tank is provided on the left side of the air flotation tank, characterized in that: A cleaning mechanism is provided on the upper side of the air flotation tank; The cleaning mechanism comprises a mounting bar arranged on the upper side of the flotation tank, the left and right ends of the mounting bar are both rotatably equipped with transmission wheels, a transmission belt is arranged between the two transmission wheels, the mounting bar is equipped with a first servo motor, the output shaft of the first servo motor is connected to the transmission wheel, the transmission belt is connected with two symmetrically arranged connecting pieces, and the two connecting pieces are both equipped with scrapers; The front and rear sides of the bottom of the flotation pool are both provided with electric slide rails, the electric slide rails are slidably provided with a cylinder, the output shaft of the cylinder is connected to the slide rail, a slide rod is slidably provided in the slide rail, the mounting bar is provided with a first connecting groove, a first connecting block matching the first connecting groove is fixed to the end of the slide rod, the slide rod is provided with a rotating assembly, and the rotating assembly can drive the mounting bar to rotate ninety degrees, a U-shaped frame is fixed to the upper end of the slide rail, a second servo motor is installed on the upper side of the U-shaped frame, the output shaft of the second servo motor is connected to the connecting shaft, a U-shaped seat is fixed to the lower side of the connecting shaft, and a connecting assembly is provided between the U-shaped seat and the left end of the mounting bar; The connecting member comprises a rectangular shell connected to the transmission belt, a slider is slidably arranged in the rectangular shell, a second spring is arranged on the side of the slider away from the mounting bar, a sleeve is rotatably mounted on the rectangular shell, the end of the sleeve is connected to the scraper, a round rod extending into the sleeve is fixed to the slider, a spiral groove is provided on the side wall of the sleeve, a fixing block matching the spiral groove is fixed to the circular rod, a pushing block abutting against the mounting bar is fixed to the slider, and inclined surfaces are processed on the front and rear sides of the pushing block; When the two connecting members are respectively located at the middle of the upper and lower sides of the mounting bar, the pushing block abuts against the first connecting block.

2. A cold rolling wastewater treatment equipment according to claim 1, characterized in that: The rotating assembly includes a gear ring rotatably assembled at the end of the slide rail, the gear ring is sleeved on the outside of the slide rod, a plurality of limit grooves are opened on the outside of the slide rod, a limit block matching the limit grooves is fixed to the inside of the gear ring, the slide rail is slidably assembled with a rack meshing with the gear ring, push rods are fixed on the left and right sides of the rack, a bottom plate is fixed on the upper end of the cylinder, and vertical rods located on the left and right sides of the rack are fixed on the bottom plate, both of the vertical rods are provided with vertical grooves, and the ends of the two push rods are respectively abutted against the two vertical grooves, a convex strip is fixed to the lower side of one of the vertical grooves, and a groove matching the convex strip is opened in the other vertical groove.

3. A cold rolling wastewater treatment equipment according to claim 2, characterized in that: A guide rail is fixed on the upper side of the bottom plate, a through groove is provided on the side wall of the rail, a guide block is fixed on the slide rod, the guide block passes through the through groove and is slidably connected to the guide rail, the guide rail is composed of a vertical rail and an inclined rail, the vertical rail is fixed at the upper end of the inclined rail, and the upper end height of the inclined rail is lower than the upper end height of the convex strip.

4. A cold rolling wastewater treatment equipment according to claim 3, characterized in that: The connecting assembly includes an installation cavity opened at the lower end of the U-shaped frame, hydraulic oil is arranged in the installation cavity, a sealing block is provided in the installation cavity for sealing and sliding, a trapezoidal block is connected to the lower end of the sealing block, the lower end of the trapezoidal block extends into the slide rail and abuts against the end of the slide rod, a first spring is provided on the upper side of the sealing block, a cavity is opened on one side of the U-shaped seat, a piston rod is provided in the cavity for sealing and sliding, a second connecting block is connected to the end of the piston rod, a second connecting groove matching the second connecting block is opened at the end of the installation strip, an annular cavity located outside the connecting shaft is opened in the middle part of the U-shaped frame, the installation cavity is connected to the annular cavity through a pipeline, the connecting shaft is opened with a channel, and the channel connects the annular cavity with the cavity.

5. A cold rolling wastewater treatment equipment according to claim 4, characterized in that: The scraper is composed of a fixed seat and a scraper blade. The fixed seat is connected to the sleeve. The scraper blade is slidably arranged in the fixed seat. An elastic component is arranged between the scraper blade and the fixed seat.

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