CN111718098A

CN111718098A - Sludge dewatering system

Info

Publication number: CN111718098A
Application number: CN202010597928.8A
Authority: CN
Inventors: 周顺桂; 胡艺怀; 方耀宗; 林启耀; 方耀将; 陶辉全
Original assignee: Xiamen Kexiangyuan Environmental Technology Co ltd
Current assignee: Xiamen Kexiangyuan Environmental Technology Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-09-29

Abstract

The invention relates to a sludge dewatering system, which belongs to the technical field of sludge treatment and comprises a filter, ultrasonic impact wall breaking equipment, microorganism conditioning wall breaking equipment and primary dewatering equipment which are sequentially connected, wherein the filter comprises a support and a machine body, the machine body is fixed on the support, a filter cavity is arranged in the machine body, the cross section of the filter cavity is circular, a connecting roller is rotatably connected to the center of the filter cavity, a filter assembly is arranged on the connecting roller and comprises a first filter screen, a second filter screen, a third filter screen and a fourth filter screen, the first filter screen, the second filter screen, the third filter screen and the fourth filter screen are uniformly arranged on the peripheral surface of the connecting roller, a liquid inlet and a liquid outlet are arranged in the filter cavity, the liquid inlet and the liquid outlet are respectively positioned at two sides of the first filter screen, and a limiting assembly for. The invention has the effects of reducing the times of stopping and cleaning the filter and improving the dehydration efficiency.

Description

Sludge dewatering system

Technical Field

The invention relates to the technical field of sludge treatment, in particular to a sludge dewatering system.

Background

With the rapid development of economy in China, the discharge amount of industrial wastewater and domestic sewage is increasing day by day, the sludge yield is rapidly increased, a large amount of sludge needs to be further treated, and secondary pollution can be caused if the sludge cannot be reasonably treated. The dehydration of the sludge is very critical, and the dehydration directly affects the treatment and resource utilization of the sludge.

Chinese patent No. CN204661527U discloses "a sludge ultrasonic wave impact conditioning plate-and-frame dewatering system", which comprises a filter, an ultrasonic wave impact wall breaking tank, a sludge conditioning tank and a diaphragm-type plate-and-frame filter press connected in sequence, wherein an ultrasonic wave emission probe is arranged at the top of the ultrasonic wave impact wall breaking tank, the ultrasonic wave emission probe is connected with an ultrasonic wave generator, an impact plate is arranged on the side wall of the ultrasonic wave impact wall breaking tank, a high pressure nozzle is arranged right in front of the impact plate, and the high pressure nozzle is perpendicular to the impact plate; the top dosing port of the sludge conditioning tank is connected with a flocculating agent dosing device and a curing agent dosing device through pipelines.

The above prior art solutions have the following drawbacks: the sludge contains a lot of domestic garbage, such as cloth strips and the like, the domestic garbage easily blocks a filter screen of the filter, the filter needs to be frequently stopped to be cleaned, and the dehydration efficiency is reduced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a sludge dewatering system which can reduce the condition of stopping to clean a filter and improve the dewatering efficiency.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a sludge dewatering system, includes filter, ultrasonic wave impact broken wall equipment, microorganism conditioning broken wall equipment and the elementary dewatering equipment that connects gradually, the filter includes support and fuselage, the fuselage is fixed on the support, is equipped with the filter chamber in the fuselage, the cross-section of filter chamber is circularly, and the center of filter chamber rotates and is connected with the connecting roll, be equipped with filter assembly on the connecting roll, filter assembly includes first filter screen, second filter screen, third filter screen and fourth filter screen, first filter screen, second filter screen, third filter screen, fourth filter screen evenly set up on connecting roll global, are equipped with inlet and liquid outlet in the filter chamber, inlet, liquid outlet are located the both sides of first filter screen respectively, are equipped with on the fuselage and carry out spacing subassembly to filter assembly.

Through adopting above-mentioned technical scheme, second filter screen, fourth filter screen place plane divide into upper plenum and lower plenum with the filter chamber, and first filter screen is vertical to be set up, and mud gets into the filter chamber from the inlet, through first filter screen, then comes out from the liquid outlet, and first filter screen filters mud, and domestic waste stays in upper plenum. When first filter screen took place to block up, unclamped spacing subassembly, anticlockwise rotation connects the roller, and turned angle is 90 degrees, and first filter screen comes horizontal position, and domestic waste is kept in being taken down the cavity by first filter screen, and the fourth filter screen comes vertical position, and the fourth filter screen filters mud. When the fourth filter screen is blocked, the connecting roller rotates anticlockwise again, the third filter screen arrives at the vertical position, and the third filter screen filters the sludge. The filter is not stopped and cleaned until the third filter screen is blocked, so that the times of stopping and cleaning the filter are reduced, and the dehydration efficiency is improved.

The present invention in a preferred example may be further configured to: the limiting assembly comprises a first limiting part and a second limiting part, the first limiting part is located at the top of the filter cavity, the first limiting part is located on one side, close to the liquid outlet, of the first filter screen, the first limiting part is abutted to the first filter screen, the second limiting part is located on one side, close to the liquid inlet, of the filter cavity, and the second limiting part is abutted to the bottom surface of the second filter screen.

By adopting the technical scheme, the connecting roller is rotated clockwise, the first filter screen can touch the first limiting piece, and the first limiting piece limits the deflection of the first filter screen; the counterclockwise rotation connects the roller, and the second locating part can be touch to the second filter screen, and the deflection of second filter screen is restricted to the second locating part for connect the unable rotation of roller, can filter.

The present invention in a preferred example may be further configured to: the top of filter chamber is equipped with the holding tank, first locating part includes stopper and first spring, the stopper is close to the one end of liquid outlet and the lateral wall of holding tank articulated, the other end and first filter screen butt, first spring is located the holding tank, the one end of first spring and the bottom surface fixed connection of holding tank, the fixed surface of the other end and stopper is connected.

Through adopting above-mentioned technical scheme, the elasticity of first spring makes the one end of stopper stretch to the filter chamber for the stopper can carry on spacingly to first filter screen. When the filter screen is changed in the rotation, the fourth filter screen comes to the upper cavity, the end part of the fourth filter screen extrudes the limiting block, the first spring is compressed, the limiting block deflects clockwise, and the fourth filter screen can pass through the limiting block. After the fourth filter screen passes through the stopper, the fourth filter screen comes vertical position, and the elasticity of first spring makes the stopper anticlockwise deflect, and the stopper carries on spacingly to the fourth filter screen, and the fourth filter screen can filter mud, is convenient for rotate and changes the filter screen.

The present invention in a preferred example may be further configured to: be equipped with the stay cord in the first spring, the one end of stay cord and the bottom surface fixed connection of holding tank, the fixed surface connection of the other end and stopper.

Through adopting above-mentioned technical scheme, the length of stay cord is fixed, can restrict the angle that the stopper deflected anticlockwise, and the stay cord can provide the pulling force for the stopper, avoids first filter screen too big to the pressure of stopper, leads to first spring to appear damaging.

The present invention in a preferred example may be further configured to: the filter screen is characterized in that a through hole is formed in the machine body, the through hole is communicated with the filter cavity, the second limiting part comprises a limiting pin and a second spring, the limiting pin is connected with the through hole in a sliding mode, the side face of the limiting pin is abutted to the bottom face of the second filter screen, the limiting pin is sleeved with the second spring, one end of the second spring is fixedly connected with the side wall of the machine body, and the other end of the second spring is fixedly connected with the end portion of the limiting pin.

Through adopting above-mentioned technical scheme, the elasticity of second spring makes the one end of spacer pin stretch into the filter chamber, and the tip of spacer pin is spacing to the second filter screen. When the filter screen is changed in a rotating mode, the limiting pin is pulled out, the end portion of the limiting pin leaves the filter cavity, the connecting roller can be rotated, and the filter screen is convenient to change in a rotating mode.

The present invention in a preferred example may be further configured to: and a hand wheel is arranged at one end of the connecting roller.

Through adopting above-mentioned technical scheme, through setting up the hand wheel, increase moment is convenient for rotate the connection roller.

The present invention in a preferred example may be further configured to: the lateral wall that the fuselage is close to the third filter screen is equipped with the opening, the opening upper cover has closed the apron, the apron passes through fastener and fuselage fixed connection.

Through adopting above-mentioned technical scheme, through opening the apron, can clear up the filter screen in the fuselage.

The present invention in a preferred example may be further configured to: the opening is provided with a connecting groove, a gasket is arranged in the connecting groove, the cover plate is clamped with the connecting groove, and the side face of the cover plate is abutted to the gasket.

Through adopting above-mentioned technical scheme, through setting up the gasket, increase the connection leakproofness between apron and the spread groove.

The present invention in a preferred example may be further configured to: first filter screen, second filter screen, third filter screen, fourth filter screen all include framework and dictyosome, framework and connection roller fixed connection, be equipped with the mounting groove in the framework, dictyosome and mounting groove are pegged graft.

Through adopting above-mentioned technical scheme, the dictyosome is pegged graft with the mounting groove, and the dictyosome is installed in the framework, when the damage appears in the dictyosome, can extract the dictyosome and change convenient and fast.

The present invention in a preferred example may be further configured to: the frame body is provided with a reinforcing rod, and the reinforcing rod is abutted to the side face of the net body.

Through adopting above-mentioned technical scheme, through setting up the stiffener, the stiffener provides the support for the dictyosome, the structural strength of multiplicable dictyosome.

In summary, the invention includes at least one of the following beneficial technical effects:

1. when first filter screen took place to block up, unclamped spacing subassembly, anticlockwise rotation connects the roller, and turned angle is 90 degrees, and first filter screen comes horizontal position, and domestic waste is kept in being taken down the cavity by first filter screen, and the fourth filter screen comes vertical position, and the fourth filter screen filters mud. When the fourth filter screen is blocked, the connecting roller rotates anticlockwise again, the third filter screen arrives at the vertical position, and the third filter screen filters the sludge. The filter is not stopped and cleaned until the third filter screen is blocked, so that the times of stopping and cleaning the filter are reduced, and the dehydration efficiency is improved.

2. The stopper carries on spacingly to first filter screen, and the spacer pin carries on spacingly to the second filter screen for the connecting roller can't rotate, can filter. When the filter screen is rotated and replaced, the limiting pin is pulled out, the connecting roller can be rotated, and the filter screen is convenient to rotate and replace.

3. The net body is inserted into the mounting groove and mounted on the frame body, and when the net body is damaged, the net body can be pulled out for replacement, so that the device is convenient and fast.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the filter construction;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is an enlarged schematic view of portion B of FIG. 2;

fig. 5 is a cross-sectional view of the filter at the location of the connecting roller.

In the figure, 1, filter; 11. a support; 12. a body; 13. a filter chamber; 14. accommodating grooves; 15. an upper chamber; 16. a lower chamber; 17. a liquid inlet; 18. a liquid outlet; 19. a through hole; 2. ultrasonic impact wall breaking equipment; 21. breaking the wall in a tank; 22. a transmitting probe; 23. an ultrasonic generator; 3. microbial conditioning and wall breaking equipment; 31. a conditioning tank; 32. a feeding port; 33. a stirring motor; 34. a stirring paddle; 4. a primary dewatering apparatus; 41. a diaphragm plate and frame filter press; 42. a belt filter press; 43. a centrifugal dehydrator; 44. a belt type strong squeezing dehydrator; 5. a connecting roller; 51. a first filter screen; 52. a second filter screen; 53. a third filter screen; 54. a fourth filter screen; 55. a frame body; 56. a net body; 57. mounting grooves; 58. a reinforcing bar; 6. a first limit piece; 61. a limiting block; 62. a first spring; 63. pulling a rope; 7. a second limiting member; 71. a spacing pin; 72. a second spring; 73. a sealing film; 8. an opening; 81. connecting grooves; 82. a gasket; 83. a cover plate; 84. a fastener; 9. a handwheel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the sludge dewatering system disclosed by the present invention comprises a filter 1, an ultrasonic impact wall breaking device 2, a microorganism conditioning wall breaking device 3 and a primary dewatering device 4, which are connected in sequence. Wherein, filter 1 includes support 11 and fuselage 12, and fuselage 12 is fixed on support 11, has seted up filter chamber 13 in the fuselage 12, and filter chamber 13 erects the cross-section and is circular, and filter chamber 13's center is rotated and is connected with connecting roller 5, and connecting roller 5 is the cylinder type.

Referring to fig. 2, a first filter 51, a second filter 52, a third filter 53, and a fourth filter 54 are disposed on the circumferential surface of the connecting roller 5, and the first filter 51, the second filter 52, the third filter 53, and the fourth filter 54 are uniformly disposed on the connecting roller 5. The first filter 51 and the third filter 53 are vertically arranged, and the second filter 52 and the fourth filter 54 are horizontally arranged. The filter chamber 13 is divided into an upper chamber 15 and a lower chamber 16 by the planes of the second filter 52 and the fourth filter 54, the first filter 51 is located in the upper chamber 15, and the third filter 53 is located in the lower chamber 16. The upper cavity 15 is provided with a liquid inlet 17 and a liquid outlet 18, the liquid inlet 17 and the liquid outlet 18 are respectively positioned at two sides of the first filter screen 51, the bottom surface of the liquid inlet 17 is flush with the top surface of the second filter screen 52, and the bottom surface of the liquid outlet 18 is flush with the top surface of the fourth filter screen 54.

When first filter screen 51, second filter screen 52 all take place the jam, can rotate connecting roller 5 anticlockwise, and turned angle is 90 degrees, and first filter screen 51 comes the horizontal position, and domestic waste is brought down chamber 16 by first filter screen 51 and is kept in, and fourth filter screen 54 comes vertical position, and fourth filter screen 54 filters mud.

Referring to fig. 2 and 3, an accommodating groove 14 is formed at the top of the upper chamber 15, a first limiting member 6 is disposed in the accommodating groove 14, and the first limiting member 6 is located on one side of the first filter 51 close to the liquid outlet 18. The first limiting member 6 comprises a limiting block 61 and a first spring 62, the limiting block 61 is arranged obliquely downwards, one end of the limiting block 61 close to the liquid outlet 18 is hinged to the side wall of the accommodating groove 14, and the other end of the limiting block 61 abuts against the first filter screen 51. First spring 62 is located in receiving groove 14, and one end of first spring 62 is fixedly connected with the bottom surface of receiving groove 14, and the other end is fixedly connected with the surface of stopper 61. A pull rope 63 is arranged in the first spring 62, one end of the pull rope 63 is fixedly connected with the bottom surface of the accommodating groove 14, and the other end of the pull rope 63 is fixedly connected with the surface of the limiting block 61.

Referring to fig. 2 and 4, a through hole 19 is formed in the body 12, the through hole 19 is communicated with the lower cavity 16, the through hole 19 is located on one side of the lower cavity 16 close to the liquid inlet 17, and a second limiting member 7 is arranged in the through hole 19. The second limiting member 7 comprises a limiting pin 71 and a second spring 72, the limiting pin 71 is slidably connected with the through hole 19, the end face of the limiting pin 71 extends into the filter cavity 13, and the side face of the limiting pin 71 is abutted against the bottom face of the second filter screen 52. The second spring 72 is sleeved on the limit pin 71, one end of the second spring 72 is fixedly connected with the outer side wall of the body 12, and the other end of the second spring is fixedly connected with the end part of the limit pin 71 located outside the filter cavity 13. A sealing film 73 is bonded to the inner side of the through hole 19, and the sealing film 73 wraps the end of the limit pin 71.

When the connecting roller 5 is rotated clockwise, the first filter screen 51 can touch the limiting block 61, and the limiting block 61 can limit the deflection of the first filter screen 51; when the connecting roller 5 is rotated counterclockwise, the second filter screen 52 will touch the limit pin 71, and the limit pin 71 can limit the deflection of the second filter screen 52, so that the connecting roller 5 cannot rotate and can perform filtering. When the first filter screen 51 and the second filter screen 52 are blocked, the limit pin 71 is pulled out, the end part of the limit pin 71 leaves the filter cavity 13, and the connecting roller 5 can be rotated. After the second filter screen 52 rotates past the position of the limit pin 71, the limit pin 71 is loosened, and one end of the limit pin 71 extends into the filter cavity 13 due to the elastic force of the second spring 72. Continuing to rotate the connecting roller 5, the fourth filter 54 comes to the upper chamber 15, the end of the fourth filter 54 presses the limiting block 61, the first spring 62 is compressed, the limiting block 61 deflects clockwise, and the fourth filter 54 can pass through the limiting block 61. After the fourth filter screen 54 passes through the limiting block 61, the fourth filter screen 54 arrives at a vertical position, the elastic force of the first spring 62 enables the limiting block 61 to deflect anticlockwise, the pull rope 63 is tightened, the limiting block 61 contacts with the fourth filter screen 54, the limiting block 61 limits the fourth filter screen 54, the first filter screen 51 contacts with the limiting pin 71, the limiting pin 71 limits the first filter screen 51, the fourth filter screen 54 can filter sludge, and the filter screens can be conveniently rotated and replaced.

Referring to fig. 2 and 3, each of the first filter screen 51, the second filter screen 52, the third filter screen 53 and the fourth filter screen 54 includes a frame body 55 and a screen body 56, the frame body 55 is a rectangular frame, the frame body 55 is fixedly connected with the connecting roller 5, the frame body 55 is slidably connected with the filter cavity 13, an installation groove 57 is fixed on a side surface of the frame body 55, the installation grooves 57 are twice, the two installation grooves 57 are respectively located on two sides of the frame body 55, and the cross section of the installation groove 57 is U-shaped. The net body 56 is rectangular, and the net body 56 is inserted in the mounting groove 57 in a matching manner. A reinforcing bar 58 is fixed to the frame 55, and the reinforcing bar 58 abuts against the side surface of the net body 56.

The net body 56 is inserted into the mounting groove 57, the net body 56 is mounted on the frame body 55, and when the net body 56 is damaged, the net body 56 can be drawn out for replacement, so that the operation is convenient and fast. By providing reinforcing rods 58, the reinforcing rods 58 provide support to the mesh body 56, which may increase the structural strength of the mesh body 56.

Referring to fig. 2 and 5, an opening 8 is formed in a side wall of the body 12 close to the third filter 53, a connecting groove 81 is formed in the opening 8, and a gasket 82 is fixedly bonded in the connecting groove 81. The opening 8 is covered with a cover plate 83, the cover plate 83 is clamped with the connecting groove 81, the side surface of the cover plate 83 is abutted to the gasket 82, the cover plate 83 is fixedly connected with the machine body 12 through a fastener 84, the fastener 84 is a screw, and the screw penetrates through the cover plate 83, the gasket 82 and the machine body 12 to be in threaded connection. A hand wheel 9 is fixed at one end of the connecting roller 5 close to the opening 8, and the hand wheel 9 is positioned outside the filter cavity 13.

The filter screen in the machine body 12 can be cleaned by unscrewing the screw and opening the cover plate 83. By providing the gasket 82, the connection sealability between the cover plate 83 and the connection groove 81 is increased. Through setting up hand wheel 9, increase moment is convenient for rotate connecting roller 5.

Referring to fig. 1, the ultrasonic impact wall breaking apparatus 2 comprises a wall breaking tank 21, an ultrasonic emission probe 22 is arranged at the top of the wall breaking tank 21, and the ultrasonic emission probe 22 is connected with an ultrasonic generator 23. The sludge contains a large amount of microorganisms, the cell structures of the microorganisms can lock a large amount of water, the ultrasonic waves have high sound energy, the cell structures of the microorganisms can be damaged, the water in the microorganisms is released, and the subsequent sludge dehydration is facilitated.

Microbial conditioning wall-breaking equipment 3 is including adjusting tank 31, and the top of adjusting tank 31 is provided with dog-house 32 and agitator motor 33, and the internal rotation of adjusting tank 31 is connected with stirring rake 34, and agitator motor 33 drive stirring rake 34 stirs in adjusting tank 31. The wall breaking agent is put into the adjusting tank 31 from the feeding port 32 to further break the wall of the microorganisms, so that the water in the microorganisms is conveniently released. The wall breaking agent can be alkali liquor, the alkali liquor is liquid obtained by dissolving NaOH tablets and tap water according to the weight ratio of 8: 100, the alkali liquor is added into the sludge in the adjusting tank 31, the pH value of the sludge is adjusted to 10, and then the sludge is stirred for 35 minutes.

Primary dewatering equipment 4 is including the diaphragm type plate and frame filter press 41, belt filter press 42 and the centrifugal dehydrator 43 that set gradually, and the mud that comes out from microbial conditioning broken wall equipment 3 carries diaphragm type plate and frame filter press 41 department through advancing the dredge pump and advances once to dewater, and the mud after once dewatering carries out the secondary through belt filter press 42 and dewaters, and the mud after the secondary dewaters carries out the cubic through centrifugal dehydrator 43 again, and the water content of the mud after the cubic dewaters can reduce below 75%. A belt-type strong squeezing dehydrator 44 is provided behind the centrifugal dehydrator 43, and by providing the belt-type strong squeezing dehydrator 44, the sludge discharged from the centrifugal dehydrator 43 can be further dehydrated, and the water content of the sludge can be further reduced.

The implementation principle of the embodiment is as follows: at the beginning, sludge mainly passes through the upper cavity 15, the sludge enters the upper cavity 15 from the liquid inlet 17, the sludge passes through the first filter screen 51 and then comes out from the liquid outlet 18, the first filter screen 51 filters the sludge, and domestic garbage is left in the upper cavity 15. When the first filter 51 is clogged, the sludge may pass through the second filter 52, then pass through the lower chamber 16, and then exit from the liquid outlet 18, and the second filter 52 filters the sludge. When first filter screen 51, second filter screen 52 all block up, extract spacer pin 71, anticlockwise rotation connects roller 5, and turned angle is 90 degrees, and first filter screen 51 comes horizontal position, and domestic waste is brought down cavity 16 by first filter screen 51 and is kept in, and fourth filter screen 54 comes vertical position, and mud gets into cavity 15 from inlet 17, and mud passes through fourth filter screen 54, then comes out from liquid outlet 18, and fourth filter screen 54 filters mud. When the fourth filter 54 is clogged, the connection roller 5 is rotated counterclockwise again, the third filter 53 comes to a vertical position, and the third filter 53 filters the sludge. The filter 1 is not stopped to be cleaned until the third filter screen 53 is also blocked, so that the times of stopping and cleaning the filter 1 are reduced, and the dehydration efficiency is improved.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a sludge dewatering system, includes filter (1), ultrasonic wave impact broken wall equipment (2), broken wall equipment (3) and elementary dewatering equipment (4) are taked care of to the microorganism that connect gradually, its characterized in that: the filter (1) comprises a support (11) and a body (12), the body (12) is fixed on the support (11), a filter cavity (13) is arranged in the body (12), the cross section of the filter cavity (13) is circular, the center of the filter cavity (13) is rotatably connected with a connecting roller (5), a filter assembly is arranged on the connecting roller (5) and comprises a first filter screen (51), a second filter screen (52), a third filter screen (53) and a fourth filter screen (54), the first filter screen (51), the second filter screen (52), the third filter screen (53) and the fourth filter screen (54) are uniformly arranged on the peripheral surface of the connecting roller (5), a liquid inlet (17) and a liquid outlet (18) are arranged in the filter cavity (13), and the liquid inlet (17) and the liquid outlet (18) are respectively positioned at two sides of the first filter screen (51), the machine body (12) is provided with a limiting component for limiting the filtering component.

2. The sludge dewatering system of claim 1, wherein: the limiting assembly comprises a first limiting part (6) and a second limiting part (7), the first limiting part (6) is located at the top of the filter cavity (13), the first limiting part (6) is located on one side, close to the liquid outlet (18), of the first filter screen (51), the first limiting part (6) is abutted to the first filter screen (51), the second limiting part (7) is located on one side, close to the liquid inlet (17), of the filter cavity (13), and the second limiting part (7) is abutted to the bottom surface of the second filter screen (52).

3. The sludge dewatering system of claim 2, wherein: the top of filter chamber (13) is equipped with holding tank (14), first locating part (6) include stopper (61) and first spring (62), stopper (61) are close to the one end of liquid outlet (18) and the lateral wall of holding tank (14) articulated, and the other end and first filter screen (51) butt, first spring (62) are located holding tank (14), the one end of first spring (62) and the bottom surface fixed connection of holding tank (14), and the fixed surface of the other end and stopper (61) is connected.

4. A sludge dewatering system according to claim 3, wherein: a pull rope (63) is arranged in the first spring (62), one end of the pull rope (63) is fixedly connected with the bottom surface of the accommodating groove (14), and the other end of the pull rope (63) is fixedly connected with the surface of the limiting block (61).

5. The sludge dewatering system of claim 2, wherein: be equipped with through-hole (19) on fuselage (12), through-hole (19) and filter chamber (13) intercommunication, second locating part (7) include spacer pin (71) and second spring (72), spacer pin (71) and through-hole (19) sliding connection, the side of spacer pin (71) and the bottom surface butt of second filter screen (52), spacer pin (71) are located to second spring (72) cover, the one end of second spring (72) and the lateral wall fixed connection of fuselage (12), the tip fixed connection of the other end and spacer pin (71).

6. The sludge dewatering system of claim 1, wherein: and a hand wheel (9) is arranged at one end of the connecting roller (5).

7. The sludge dewatering system of claim 1, wherein: the lateral wall that fuselage (12) is close to third filter screen (53) is equipped with opening (8), opening (8) upper cover has closed apron (83), apron (83) are through fastener (84) and fuselage (12) fixed connection.

8. The sludge dewatering system of claim 7, wherein: be equipped with spread groove (81) on opening (8), be equipped with gasket (82) in spread groove (81), apron (83) and spread groove (81) joint, the side and gasket (82) butt of apron (83).

9. The sludge dewatering system of claim 1, wherein: first filter screen (51), second filter screen (52), third filter screen (53), fourth filter screen (54) all include framework (55) and dictyosome (56), framework (55) and connection roller (5) fixed connection, be equipped with mounting groove (57) on framework (55), dictyosome (56) and mounting groove (57) are pegged graft.

10. The sludge dewatering system of claim 9, wherein: and a reinforcing rod (58) is arranged on the frame body (55), and the reinforcing rod (58) is abutted against the side surface of the net body (56).