A high-efficiency dewatering device for sludge

Abstract

The present application relates to sewage treatment technical field, specifically to a kind of sludge efficient dewatering equipment.A kind of sludge efficient dewatering equipment includes shell, drum, shaft and adjusting mechanism.Adjusting mechanism includes mud scraping ring, and mud scraping ring is provided with mud scraping plate.Drum and shaft relatively rotate, when mud scraping ring is rotated by drum, solid material formed after sludge is dewatered is cut by mud scraping plate.Through cutting, solid material is divided into several small pieces, more conducive to solid material to discharge outward, avoid jam.When the moisture content of solid material discharged at discharge port is higher, the rotational speed of drum and shaft is increased, to increase the centrifugal force of sludge, improve the dewatering efficiency of sludge.And the rotational speed difference of drum and shaft is reduced, so that the residence time of sludge in drum is extended, further improve the dewatering efficiency of sludge.The present application provides a kind of sludge efficient dewatering equipment to solve the problem that existing dewatering machine, sludge drying is not uniform, and easily produces jam.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically to a high-efficiency dewatering equipment for sludge. BACKGROUND

[0002] Sludge is the product after sewage treatment, which is a very complex heterogeneous body composed of organic residues, bacterial cells, inorganic particles, and colloidal sludge. If sludge is discharged at will, it will cause water pollution and further pollute the environment, so sludge needs to be treated.

[0003] Horizontal screw dewaterer is a kind of centrifuge commonly used in sludge dewatering process. Its main components are a drum and a spiral conveyor with a hollow shaft. The sludge enters the drum through the hollow shaft and is thrown into the drum under the action of centrifugal force. Due to the large density of sludge particles and strong centrifugal force, the sludge is thrown to the inner wall of the drum to form a solid layer. The density of water is smaller, and the centrifugal force is weaker, so it can only form a liquid layer inside the solid layer. The sludge in the solid layer is slowly pushed to the conical end of the drum by the spiral pushing device. The liquid in the liquid layer is continuously discharged through the outlets around the drum and then continuously discharged outside the drum through the weir. A certain gap is provided between the screw and the drum to facilitate the discharge of liquid. However, during the extrusion stage, most of the liquid needs to flow radially outward to reach the gap position before being discharged, which makes it difficult to drain the sludge near the center of the circle, resulting in uneven water content inside and outside.

[0004] The utility model patent with the publication number CN208357050U provides a horizontal screw type sedimentation centrifugal dewaterer, which can perform defoaming treatment on the liquid through the arranged defoaming plate. However, when the material reaches the conical section, the water is squeezed out due to continuous extrusion of the material, and the material will generate a reverse thrust on the spiral plate, forming an axial extrusion force. This force is transmitted to the center shaft, and long-term bearing of high axial force will cause damage to the center shaft. In addition, due to the different water content of the sludge, the water content of the sludge will change when the parameters such as the speed of the spiral conveyor and the drum remain unchanged: when the water content is small, the sludge is more likely to block the discharge port. When the water content is large, it does not reach the treatment standard. The prior art usually adjusts the speed difference to change the water content of the sludge, but when the speed difference increases, the sludge discharge speed increases, which is easy to cause blockage. SUMMARY

[0005] The present application provides a high-efficiency dewatering equipment for sludge to solve the problems of uneven drying of sludge, easy damage to the center shaft, and easy blockage of the existing dewaterer.

[0006] The efficient sludge dewatering device of the present application adopts the following technical scheme: an efficient sludge dewatering device, comprising a shell, a rotating drum, a rotating shaft, a guide mechanism and an adjusting mechanism. The rotating drum is horizontally arranged and rotatably arranged in the shell. The internal space of the rotating drum comprises a conveying cavity and a drying cavity which are in communication with each other. The rotating shaft is coaxial with the rotating drum and is rotatably arranged in the rotating drum. The rotating shaft is provided with a first conical surface and a second conical surface which are coaxial with the rotating shaft. The first conical surface and the second conical surface are located in the drying cavity, and the first conical surface is located on the side close to the conveying cavity relative to the second conical surface.

[0007] A first water outlet channel is formed in the rotating shaft between the first conical surface and the second conical surface. A plurality of water outlet holes are formed in the rotating shaft to communicate the first water outlet channel and the drying cavity. Along the axial direction of the rotating shaft and in the direction gradually close to the first water outlet channel, the radii of the first conical surface and the second conical surface gradually decrease. The guide mechanism is used to convey the sludge in the conveying cavity to the ends of the first conical surface and the second conical surface away from the first water outlet channel.

[0008] The adjusting mechanism comprises a mud scraping ring fixedly arranged on the inner side of the rotating drum. The mud scraping ring is coaxially arranged with the rotating shaft and is located on the outer side of the rotating shaft. A plurality of mud outlets are formed in the mud scraping ring along the circumferential direction of the mud scraping ring. A plurality of mud scraping plates are fixedly arranged on the mud scraping ring, and each mud scraping plate is located at a mud outlet. The mud scraping plates are arranged obliquely. When the rotating drum rotates relative to the rotating shaft, the mud scraping plates are used to cut and guide the solid materials formed by the dewatered sludge on the inner side of the mud scraping plates into the corresponding mud outlets.

[0009] Further, the two ends of the rotating drum are a first end and a second end. The conveying cavity and the drying cavity are arranged in sequence along the direction from the first end to the second end of the rotating drum. The first conical surface and the second conical surface are arranged in sequence along the direction from the first end to the second end of the rotating drum.

[0010] A conical channel is formed in the rotating shaft, and the radius of the conical channel gradually increases along the direction from the first end to the second end of the rotating drum. A plurality of first through holes are formed in the rotating shaft, and the plurality of first through holes are arranged in sequence along the circumferential direction of the rotating shaft. The first through holes communicate the conical channel and the conveying cavity. The efficient sludge dewatering device further comprises a feed pipe arranged in the rotating shaft and communicating with the conical channel.

[0011] Further, a first guide channel is formed between the first conical surface and the inner wall of the rotating drum, and a second guide channel is formed between the second conical surface and the inner wall of the rotating drum. A plurality of connecting channels are formed in the inner side of the rotating drum and arranged along the circumferential direction of the rotating drum. Each connecting channel is arranged along the axial direction of the rotating drum, and the two ends of each connecting channel communicate with the first guide channel and the second guide channel, respectively. The guide mechanism comprises a first spiral blade located in the conveying cavity. The first spiral blade is fixedly arranged on the rotating shaft and coaxially arranged with the rotating shaft. The first spiral blade is used to transport the sludge into the drying cavity.

[0012] Further, the adjusting mechanism further comprises a second spiral blade and a third spiral blade, the second spiral blade is fixedly arranged on the first conical surface, and the third spiral blade is fixedly arranged on the second conical surface. The second spiral blade and the third spiral blade are opposite in rotation direction, have the same size, and are used for transporting sludge to the first water outlet channel.

[0013] Further, the first spiral blade, the second spiral blade and the third spiral blade are away from the rotating shaft and have a gap with the rotating drum. The first end of the rotating drum is provided with a plurality of first water outlets, and the plurality of first water outlets are distributed along the circumference of the rotating drum. The first water outlet is in communication with the conveying cavity. The second end of the rotating drum is provided with a plurality of second water outlets, and the plurality of second water outlets are distributed along the circumference of the rotating drum. The second water outlet is in communication with the second guide channel.

[0014] Further, along the rotating direction of the rotating drum, the side of the sludge scraping plate away from the side of the sludge scraping ring at which the sludge scraping plate and the sludge scraping ring are connected is in front of the side. The sludge scraping plate is a wave-shaped structure extending along the axis of the sludge scraping ring.

[0015] Further, the rotating drum is provided with a plurality of discharge channels, the plurality of discharge channels are sequentially distributed along the circumference of the rotating drum, each discharge channel is in communication with a sludge outlet, and the discharge channel is in communication with the drying cavity. The lower side of the shell is provided with a discharge outlet, the discharge outlet is in communication with the drying cavity, and the discharge outlet corresponds to the discharge channel.

[0016] Further, the rotating shaft is further provided with a second water outlet channel, and the second water outlet channel is arranged along the axis of the rotating shaft. One end of the second water outlet channel is in communication with the outside, and the other end of the second water outlet channel is in communication with the first water outlet channel. The efficient sludge dewatering device further comprises a liquid pump, and the liquid pump is fixedly arranged on the shell. The liquid pump is in rotating connection with the rotating shaft and is in communication with the second water outlet channel.

[0017] Further, the efficient sludge dewatering device further comprises a driving mechanism, and the driving mechanism comprises a first driving assembly and a second driving assembly. The first driving assembly comprises a first motor and a first belt. The first motor is fixedly arranged on the shell, and the first belt connects the output shaft of the first motor and the rotating drum. The second driving assembly comprises a second motor and a second belt, and the second motor is fixedly arranged on the shell. The second belt connects the output shaft of the second motor and the rotating shaft.

[0018] Further, the efficient sludge dewatering device further comprises a sensor and two controllers, the sensor is arranged at the discharge outlet, and the sensor is used for sensing the water content of the solid material. The two controllers control the rotating speeds of the first motor and the second motor according to the water content of the solid material sensed by the sensor. The higher the water content of the solid material at the discharge outlet, the higher the rotating speeds of the first motor and the second motor, and the smaller the difference between the rotating speeds of the first motor and the second motor.

[0019] The beneficial effects of the present application are: the sludge efficient dewatering equipment of the present application, by setting the guide mechanism and adjusting mechanism. The sludge is put into the conveying cavity, the guide mechanism transports the sludge in the conveying cavity to the first conical surface and the second conical surface away from one end of the first water outlet channel. The sludge in the first conical surface and the second conical surface gradually moves to the first water outlet channel, and the liquid in the sludge comes to the first water outlet channel through the water outlet hole.

[0020] Due to the relative rotation of the rotating drum and the rotating shaft, the rotating drum drives the mud scraping ring to rotate synchronously, and the mud scraping ring cuts the solid materials formed by dewatering the sludge through the mud scraping plate when rotating and guides them into the mud outlet. By cutting, the solid materials are divided into small pieces, which is more conducive to the outward discharge of the solid materials and avoids blockage.

[0021] When the water content of the solid materials discharged at the discharge port is high, the rotating speed of the rotating drum and the rotating shaft is increased, thereby increasing the centrifugal force on the sludge and improving the dewatering efficiency of the sludge. And the rotating speed difference of the rotating drum and the rotating shaft is reduced, thereby prolonging the time of the sludge staying in the rotating drum, and further improving the dewatering efficiency of the sludge. When the water content of the solid materials discharged at the discharge port is low, the rotating speed difference of the rotating drum and the rotating shaft is increased, thereby reducing the time of the sludge staying in the rotating drum, and accelerating the discharge of the solid materials. Ensure the dewatering efficiency while avoiding blockage. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A structural schematic view of a sludge efficient dewatering equipment provided for the embodiments of the present application;

[0024] Figure 2 A sectional view of a sludge efficient dewatering equipment provided for the embodiments of the present application;

[0025] Figure 3 Another perspective sectional view of a sludge efficient dewatering equipment provided for the embodiments of the present application;

[0026] Figure 4 A Figure 3 An enlarged view of A in FIG. 6;

[0027] Figure 5 A Figure 4 An enlarged view of B in FIG. 6;

[0028] Figure 6A structure diagram of a mud scraping ring of a high-efficiency sludge dewatering device is provided in the embodiments of the present application.

[0029] In the figure: 100, shell; 110, feeding pipe; 120, liquid pumping pump; 130, first motor; 131, first belt; 140, second motor; 141, second belt; 200, rotary drum; 201, first water outlet; 202, second water outlet; 203, discharging channel; 210, conveying cavity; 220, drying cavity; 230, connecting channel; 240, discharging port; 300, rotating shaft; 310, first water outlet channel; 311, water outlet hole; 320, conical channel; 321, first through hole; 330, second water outlet channel; 400, mud scraping ring; 410, mud scraping plate; 420, mud outlet; 500, first spiral blade; 510, second spiral blade; 520, third spiral blade. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0031] Reference Figures 1 to 6 As shown in the figure, the high-efficiency sludge dewatering device provided by the embodiments of the present application comprises a shell 100, a rotary drum 200, a rotating shaft 300, a guiding mechanism and an adjusting mechanism. The rotary drum 200 is horizontally arranged and rotatably arranged in the shell 100. The internal space of the rotary drum 200 comprises a conveying cavity 210 and a drying cavity 220 which are in communication with each other.

[0032] The rotating shaft 300 and the rotary drum 200 are coaxial and rotatably arranged in the rotary drum 200. The rotating speed of the rotating shaft 300 and the rotary drum 200 has a rotating speed difference. The rotating shaft 300 is provided with a first conical surface and a second conical surface which are coaxial with the rotating shaft 300. The first conical surface and the second conical surface are located in the drying cavity 220, and the first conical surface is located on the side close to the conveying cavity 210 relative to the second conical surface.

[0033] The first water outlet channel 310 is arranged between the first conical surface and the second conical surface in the rotating shaft 300. The rotating shaft 300 is provided with a plurality of water outlet holes 311 which are in communication with the first water outlet channel 310 and the drying cavity 220. The radii of the first conical surface and the second conical surface gradually decrease along the axial direction of the rotating shaft 300 and along the direction gradually close to the first water outlet channel 310. The guiding mechanism is used for conveying the sludge in the conveying cavity 210 to the ends of the first conical surface and the second conical surface which are far away from the first water outlet channel 310.

[0034] The adjusting mechanism comprises a mud scraping ring 400 fixedly arranged inside the rotary drum 200, the mud scraping ring 400 and the rotary shaft 300 are coaxially arranged and located outside the rotary shaft 300.

[0035] The mud scraping ring 400 is provided with a plurality of mud outlets 420 distributed along the circumferential direction of the mud scraping ring 400. A plurality of mud scraping plates 410 are fixedly arranged on the mud scraping ring 400, and each mud scraping plate 410 is located at a corresponding mud outlet 420. The mud scraping plate 410 is arranged obliquely, and when the rotary drum 200 rotates relative to the rotary shaft 300, the mud scraping plate 410 is used to cut and guide the solid material formed after dehydration of the sludge inside the mud scraping plate 410 into the corresponding mud outlet 420.

[0036] The rotary drum 200 and the rotary shaft 300 are rotated, and the rotation speeds of the rotary drum 200 and the rotary shaft 300 are inconsistent. The sludge is poured into the conveying cavity 210, and the guiding mechanism conveys the sludge in the conveying cavity 210 to the first and second conical surfaces away from one end of the first water outlet channel 310.

[0037] The sludge entering the first and second conical surfaces gradually moves to the first water outlet channel 310, and the liquid in the sludge comes to the first water outlet channel 310 through the water outlet hole 311.

[0038] Due to the relative rotation of the rotary drum 200 and the rotary shaft 300, the rotary drum 200 drives the mud scraping ring 400 to rotate synchronously. When the mud scraping ring 400 rotates, the solid material is cut by the mud scraping plate 410 and guided into the mud outlet 420. The solid material is cut into small pieces, which is more conducive to the outward discharge of the solid material and avoids blockage.

[0039] When the water content of the solid material discharged at the discharge port 240 is high, the rotation speeds of the rotary drum 200 and the rotary shaft 300 are increased, thereby increasing the centrifugal force on the sludge and improving the dewatering efficiency of the sludge. And the speed difference between the rotary drum 200 and the rotary shaft 300 is reduced, thereby prolonging the time for the sludge to stay in the rotary drum 200, and further improving the dewatering efficiency of the sludge. When the water content of the solid sludge discharged at the discharge port 240 is low, the speed difference between the rotary drum 200 and the rotary shaft 300 is increased, thereby reducing the time for the sludge to stay in the rotary drum 200, and speeding up the discharge of the solid material. Ensure the dewatering efficiency while avoiding blockage.

[0040] In the embodiment, the two ends of the rotary drum 200 are respectively a first end and a second end. The conveying cavity 210 and the drying cavity 220 are sequentially distributed along the direction from the first end to the second end of the rotary drum 200. The first and second conical surfaces are sequentially distributed along the direction from the first end to the second end of the rotary drum 200.

[0041] The shaft 300 is provided with a tapered channel 320, which has a gradually increasing radius along a direction from the first end to the second end of the rotary drum 200. The shaft 300 is also provided with a plurality of first through holes 321, which are sequentially distributed along a circumferential direction of the shaft 300. The first through holes 321 communicate the tapered channel 320 and the conveying cavity 210. The first through holes 321 are located in a middle portion of the conveying cavity 210. The high-efficiency dewatering equipment for sludge further comprises a feeding pipe 110, which is coaxially arranged with the shaft 300, is arranged in the shaft 300, and communicates with the tapered channel 320.

[0042] The sludge is fed into the rotary drum 200 from the feeding pipe 110, and is first fed into the tapered channel 320. Under the rotation of the shaft 300, the sludge in the tapered channel 320 is thrown out from the first through holes 321 to the conveying cavity 210. Under the action of centrifugal force, the solid-liquid components in the sludge are first separated.

[0043] In the embodiment, the first tapered surface and the inner wall of the rotary drum 200 form a first guide channel, and the second tapered surface and the inner wall of the rotary drum 200 form a second guide channel. The inner side of the rotary drum 200 is provided with a plurality of connecting channels 230, which are distributed along a circumferential direction of the rotary drum 200. Each connecting channel 230 is arranged along an axial direction of the rotary drum 200, and two ends of each connecting channel 230 respectively communicate with the first guide channel and the second guide channel. The connecting channels 230 are located between the shaft 300 and the rotary drum 200 of the conveying cavity 210. The guide mechanism comprises a first spiral blade 500, which is located in the conveying cavity 210. The first spiral blade 500 is fixedly arranged on the shaft 300 and coaxially arranged with the shaft 300. The first spiral blade 500 is used for transporting the sludge into the drying cavity 220.

[0044] The sludge entering the drying cavity 220 is partially fed into the first guide channel. Part of the sludge is fed into the connecting channels 230 and then into the second guide channel from the connecting channels 230.

[0045] In the embodiment, the adjusting mechanism further comprises a second spiral blade 510 and a third spiral blade 520, the second spiral blade 510 is fixedly arranged on the first tapered surface, and the third spiral blade 520 is fixedly arranged on the second tapered surface. The second spiral blade 510 and the third spiral blade 520 have opposite rotation directions, the same size, and are both used for transporting the sludge to the first water outlet channel 310.

[0046] In the embodiment, the first spiral blade 500, the second spiral blade 510 and the third spiral blade 520 are away from the side of the rotating shaft 300 and leave a gap with the drum 200. The first end of the drum 200 is provided with a plurality of first water outlets 201, and the plurality of first water outlets 201 are distributed along the circumference of the drum 200. The first water outlet 201 and the conveying cavity 210 are in communication. The second end of the drum 200 is provided with a plurality of second water outlets 202, and the plurality of second water outlets 202 are distributed along the circumference of the drum 200. The second water outlet 202 and the second guide channel are in communication.

[0047] Part of the liquid in the conveying cavity 210 is discharged outward from the first water outlet 201. Part of the liquid in the second guide channel is discharged from the second water outlet 202.

[0048] In the embodiment, along the rotation direction of the drum 200, the side of the mud scraping plate 410 away from the side of the mud scraping ring 400 is in front of the side where the mud scraping plate 410 and the mud scraping ring 400 are connected. The mud scraping plate 410 is a wave-shaped structure extending along the axial direction of the mud scraping ring 400.

[0049] During the rotation of the mud scraping plate 410, the solid material has a tendency to move along the radial direction of the mud scraping ring 400, but the solid material itself is subjected to axial extrusion force of the mud scraping ring 400. By setting the mud scraping plate 410 to be corrugated, the cut solid material will not form a dense block structure, further avoiding blockage.

[0050] In the embodiment, the drum 200 is provided with a plurality of discharge channels 203, and the plurality of discharge channels 203 are sequentially distributed along the circumference of the drum 200. Each discharge channel 203 is in communication with a mud outlet 420, and the discharge channel 203 is in communication with the drying cavity 220. The lower side of the shell 100 is provided with a discharge port 240, and the discharge port 240 is in communication with the drying cavity 220 and corresponds to the discharge channel 203.

[0051] In the embodiment, the rotating shaft 300 is further provided with a second water outlet channel 330, and the second water outlet channel 330 is arranged along the axial direction of the rotating shaft 300. One end of the second water outlet channel 330 is in communication with the outside, and the other end of the second water outlet channel 330 is in communication with the first water outlet channel 310. The efficient sludge dewatering equipment further comprises a liquid pumping pump 120 fixedly arranged on the shell 100. The liquid pumping pump 120 is in rotational connection with the rotating shaft 300 and in communication with the second water outlet channel 330.

[0052] The liquid pumping pump 120 is started to pump out the water in the sludge. The water in the sludge enters the first water outlet channel 310 from the water outlet hole 311 and is discharged outward after entering the second water outlet channel 330.

[0053] In the embodiment, the efficient sludge dewatering device further comprises a driving mechanism, the driving mechanism comprising a first driving assembly and a second driving assembly. The first driving assembly comprises a first motor 130 and a first belt 131. The first motor 130 is fixedly arranged on the shell 100, and the first belt 131 connects the output shaft of the first motor 130 and the rotary drum 200. The second driving assembly comprises a second motor 140 and a second belt 141. The second motor 140 is fixedly arranged on the shell 100, and the second belt 141 connects the output shaft of the second motor 140 and the rotating shaft 300.

[0054] In the embodiment, the efficient sludge dewatering device further comprises a sensor and two controllers. The sensor is arranged at the discharge port 240 and is used to sense the water content of the solid material. The two controllers control the rotating speeds of the first motor 130 and the second motor 140 respectively according to the water content of the solid material sensed by the sensor. The higher the water content of the solid material at the discharge port 240, the higher the rotating speeds of the first motor 130 and the second motor 140, and the smaller the difference between the rotating speeds of the first motor 130 and the second motor 140.

[0055] Working process: Start the first motor 130 and the second motor 140. The first motor 130 drives the rotary drum 200 to rotate through the first belt 131. The second motor 140 drives the rotating shaft 300 to rotate through the second belt 141, and the rotating speeds of the rotary drum 200 and the rotating shaft 300 are inconsistent.

[0056] The sludge is poured into the rotary drum 200 from the feeding pipe 110. The sludge first enters the conical passage 320. Under the rotation of the rotating shaft 300, the sludge in the conical passage 320 is thrown out from the first through hole 321 to the conveying cavity 210. Under the action of centrifugal force, the solid-liquid components in the sludge are separated for the first time. The solid material in the sludge is thrown onto the inner wall of the rotary drum 200, and part of the separated liquid is discharged from the first water outlet 201. The rotating shaft 300 drives the first spiral blade 500 to rotate, and the first spiral blade 500 pushes the remaining sludge from the conveying cavity 210 to the drying cavity 220.

[0057] The sludge entering the drying cavity 220, part of the sludge enters the first guide passage. Part of the sludge enters the connecting passage 230 and then enters the second guide passage from the connecting passage 230, and part of the liquid in the sludge is discharged from the second water outlet 202.

[0058] The rotating shaft 300 drives the second spiral blade 510 and the third spiral blade 520 to rotate when rotating. The second spiral blade 510 and the third spiral blade 520 both push the sludge to the first water outlet passage 310. Since the second spiral blade 510 is on the first conical surface and the third spiral blade 520 is on the second conical surface, the sludge is extruded when being pushed, so that the solid-liquid components in the sludge are separated for the second time.

[0059] The second spiral blade 510 and the third spiral blade 520 push the sludge to move, and improve the dewatering efficiency. At the same time, since the main stress area of the rotating shaft 300 is the drying cavity 220, the force of the sludge on the second spiral blade 510 and the third spiral blade 520 is the same in size and opposite in direction, so that the rotating shaft 300 is subjected to axial forces of the same size but opposite directions, and the stress is mutually offset, avoiding damage to the bearing.

[0060] When the sludge is pushed by the first spiral blade 500 and the second spiral blade 510 to the first water outlet channel 310, the liquid pump 120 is started at the same time to extract the water in the sludge, realizing the third separation. The water in the sludge enters the first water outlet channel 310 from the water outlet hole 311, and is discharged outward after entering the second water outlet channel 330.

[0061] After the sludge is subjected to three solid-liquid separations, the drying is more thorough. And the water content of the sludge in the conveying cavity 210 is higher the closer it is to the center of the rotary drum 200. When the sludge in the conveying cavity 210 enters the drying cavity 220, part of the sludge enters the first guide channel, and part of the sludge enters the connecting channel 230, which divides the sludge into two streams for drying, which can better dry the sludge close to the center of the rotary drum 200.

[0062] After the water in the sludge at the first water outlet channel 310 is extracted, the solid material formed after the sludge is dewatered is inside the mud scraping ring 400. Since the rotary drum 200 and the rotating shaft 300 have different rotating speeds, the rotary drum 200 and the rotating shaft 300 rotate relatively. The rotary drum 200 drives the mud scraping ring 400 to rotate relative to the rotating shaft 300.

[0063] The mud scraping ring 400 rotates to cut the solid material by the mud scraping plate 410 and guide it to the mud outlet 420. Then, the solid material enters the discharge channel 203 and is finally discharged outward from the discharge port 240. By cutting the solid material into small pieces, it is more conducive to the discharge of the solid material, avoiding blockage.

[0064] During the rotation of the mud scraping plate 410, the solid material has a tendency to move radially along the mud scraping ring 400, but the solid material itself will be subjected to axial extrusion force by the mud scraping ring 400. By setting the mud scraping plate 410 in a corrugated shape, the cut solid material will not form a dense block structure, further avoiding blockage.

[0065] When the inductor detects that the water content of the solid material discharged from the discharge port 240 is high, the controller controls the rotating speeds of the first motor 130 and the second motor 140, so that the rotating speeds of the rotary drum 200 and the rotating shaft 300 are both increased, thereby increasing the centrifugal force on the sludge and improving the dewatering efficiency of the sludge. And the controller makes the rotating speed difference between the rotary drum 200 and the rotating shaft 300 smaller, thereby prolonging the time for the sludge to stay in the rotary drum 200, further improving the dewatering efficiency of the sludge.

[0066] When the inductor senses that the water content of the solid material discharged at the discharge port 240 is low, the controller controls the rotation speeds of the first motor 130 and the second motor 140, so that the rotation speed difference between the rotary drum 200 and the rotary shaft 300 is increased, thereby reducing the residence time of the sludge in the rotary drum 200 and accelerating the discharge of the solid material.

[0067] The above description is merely preferred embodiments of the present application, but not to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-efficiency dewatering device for sludge, characterized in that: comprising a shell, a rotating drum, a rotating shaft, a guide mechanism and an adjusting mechanism; the rotating drum is horizontally arranged and rotatably arranged in the shell; the internal space of the rotating drum comprises a conveying cavity and a drying cavity which are in communication with each other; the rotating shaft is coaxial with the rotating drum and rotatably arranged in the rotating drum; the rotating shaft is provided with a first conical surface and a second conical surface which are coaxial with the rotating shaft; the first conical surface and the second conical surface are located in the drying cavity, and the first conical surface is located on the side close to the conveying cavity relative to the second conical surface; a first water outlet channel is formed in the rotating shaft between the first conical surface and the second conical surface; a plurality of water outlet holes are formed in the rotating shaft and communicate the first water outlet channel and the drying cavity; the radii of the first conical surface and the second conical surface gradually decrease along the axial direction of the rotating shaft and in the direction gradually close to the first water outlet channel; the guide mechanism is used for conveying the sludge in the conveying cavity to the ends of the first conical surface and the second conical surface away from the first water outlet channel; the adjusting mechanism comprises a mud scraping ring fixedly arranged on the inner side of the rotating drum, the mud scraping ring is coaxially arranged with the rotating shaft and located on the outer side of the rotating shaft; a plurality of mud outlet openings are formed on the mud scraping ring and distributed along the circumferential direction of the mud scraping ring; a plurality of mud scraping plates are fixedly arranged on the mud scraping ring, and each mud scraping plate is located at a corresponding mud outlet opening; the mud scraping plates are arranged obliquely, and when the rotating drum rotates relative to the rotating shaft, the mud scraping plates are used for cutting and guiding the solid materials formed by dewatering the sludge on the inner side of the mud scraping plates into the corresponding mud outlet openings; a first guide channel is formed between the first conical surface and the inner wall of the rotating drum, and a second guide channel is formed between the second conical surface and the inner wall of the rotating drum; a plurality of connecting channels are formed in the inner side of the rotating drum and distributed along the circumferential direction of the rotating drum; each connecting channel is arranged along the axial direction of the rotating drum, and the two ends of each connecting channel are in communication with the first guide channel and the second guide channel respectively; the guide mechanism comprises a first spiral blade, and the first spiral blade is located in the conveying cavity; the first spiral blade is fixedly arranged on the rotating shaft and coaxially arranged with the rotating shaft; the first spiral blade is used for transporting the sludge into the drying cavity; the adjusting mechanism further comprises a second spiral blade and a third spiral blade, the second spiral blade is fixedly arranged on the first conical surface, and the third spiral blade is fixedly arranged on the second conical surface; the second spiral blade and the third spiral blade are opposite in rotation direction, same in size, and are both used for transporting the sludge to the first water outlet channel; along the rotating direction of the rotating drum, the side of the mud scraping plate away from the mud scraping ring is located in front of the side where the mud scraping plate and the mud scraping ring are connected; the mud scraping plate is a wave-shaped structure extending along the axial direction of the mud scraping ring.

2. The high-efficiency dewatering device for sludge according to claim 1, characterized in that: the two ends of the rotating drum are a first end and a second end respectively; the conveying cavity and the drying cavity are sequentially distributed along the direction from the first end to the second end of the rotating drum; the first conical surface and the second conical surface are sequentially distributed along the direction from the first end to the second end of the rotating drum; a conical channel is formed in the rotating shaft, and the radius of the conical channel gradually increases along the direction from the first end to the second end of the rotating drum; a plurality of first through holes are formed in the rotating shaft and sequentially distributed along the circumferential direction of the rotating shaft; the first through holes communicate the conical channel and the conveying cavity; the high-efficiency dewatering device for sludge further comprises a feeding pipe, and the feeding pipe is arranged in the rotating shaft and in communication with the conical channel. ​ ​ 3. The efficient dewatering device for sludge according to claim 2, characterized in that: The first spiral piece, the second spiral piece and the third spiral piece are away from the side of the rotating shaft and leave a gap between the rotating drum; the first end of the rotating drum is provided with a plurality of first water outlets, and the plurality of first water outlets are distributed along the circumference of the rotating drum; the first water outlet is communicated with the conveying cavity; the second end of the rotating drum is provided with a plurality of second water outlets, and the plurality of second water outlets are distributed along the circumference of the rotating drum; the second water outlet is communicated with the second guide channel.

4. The efficient dewatering device for sludge according to claim 1, characterized in that: The rotating drum is provided with a plurality of discharge channels, and the plurality of discharge channels are sequentially distributed along the circumference of the rotating drum; each discharge channel is communicated with a sludge outlet, and the discharge channel is communicated with the drying cavity; the lower side of the shell is provided with a discharge outlet, the discharge outlet is communicated with the drying cavity, and the discharge outlet corresponds to the discharge channel.

5. The efficient dewatering device for sludge according to claim 1, characterized in that: The rotating shaft is further provided with a second water outlet channel, and the second water outlet channel is arranged along the axial direction of the rotating shaft; one end of the second water outlet channel is communicated with the outside, and the other end of the second water outlet channel is communicated with the first water outlet channel; the efficient dewatering device for sludge further comprises a liquid pumping pump, and the liquid pumping pump is fixedly arranged on the shell; the liquid pumping pump is rotatably connected with the rotating shaft and communicated with the second water outlet channel.

6. The efficient dewatering device for sludge according to claim 4, characterized in that: The efficient dewatering device for sludge further comprises a driving mechanism, and the driving mechanism comprises a first driving assembly and a second driving assembly; the first driving assembly comprises a first motor and a first belt; the first motor is fixedly arranged on the shell, and the first belt is connected with the output shaft of the first motor and the rotating drum; the second driving assembly comprises a second motor and a second belt, and the second motor is fixedly arranged on the shell; the second belt is connected with the output shaft of the second motor and the rotating shaft.

7. The efficient dewatering device for sludge according to claim 6, characterized in that: The efficient dewatering device for sludge further comprises a sensor and two controllers; the sensor is arranged at the discharge outlet, and the sensor is used for sensing the water content of the solid material; the two controllers control the rotating speeds of the first motor and the second motor according to the water content of the solid material sensed by the sensor; when the water content of the solid material at the discharge outlet is high, the controllers control the rotating speeds of the first motor and the second motor to increase, and the rotating speed difference between the first motor and the second motor becomes smaller.

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