CN117003461A - A river bottom sludge dewatering device - Google Patents

Abstract

The application discloses a river bottom sludge dewatering device, which comprises: a mounting frame body; the centrifugal limiting shell is arranged on the mounting frame body, and a drain pipe for draining water flow after sludge dehydration is arranged at the bottom of the centrifugal limiting shell; the centrifugal driving assembly is obliquely arranged on the centrifugal limiting shell and is used for centrifugal dehydration treatment of river bottom sludge; the feeding assembly is arranged on the mounting frame body and used for feeding sludge of the centrifugal driving assembly; the filter pressing pushing-out assembly is arranged on the centrifugal driving assembly and connected with the feeding assembly and is used for carrying out filter pressing treatment on the mud cakes subjected to centrifugal dehydration and pushing the mud cakes subjected to filter pressing into the mud collecting groove when the centrifugal driving assembly is operated. According to the application, the centrifugal driving assembly and the filter pressing pushing assembly which are connected with each other can be synchronously driven to operate, so that the integral device can carry out filter pressing treatment on the sludge while carrying out centrifugal dehydration on the sludge, and the water content of the sludge after the centrifugal dehydration operation is reduced.

Description

A river bottom sludge dewatering device

Technical field

The invention relates to the technical field of silt treatment, and in particular to a river bottom silt dewatering device.

Background technique

Silt is generally deposited in urban rivers. It is an unconsolidated soft fine-grained or extremely fine-grained soil formed through physical, chemical and biochemical effects. It is rich in organic matter and nutrients such as N and P, and can provide water organisms with Provide certain growth and living conditions, but due to the advancement of urbanization, domestic wastewater, industrial wastewater, etc. are discharged into the river, which often causes damage and pollution to the river, resulting in poor water flow and intensified river mud sedimentation. Therefore, in order to ensure the water body The animals and plants in the river reduce water pollution in the river. Quantitative cleaning of the river dredging has become a necessary task to keep the river clean and protect the biological growth environment of the river water.

In order to recycle and reduce pollution during the dredging process of existing river bottom sludge, it is generally necessary to dewater the cleaned river bottom sludge. Common sludge dewatering generally uses a belt filter press or a plate and frame filter press. , the dehydration moisture content of the belt filter press can only reach about 50%, and the belt filter press equipment loss is large, while the plate and frame filter press has a long dehydration cycle and low efficiency.

Therefore, in order to improve the dewatering quality of sludge, decanter centrifuges are generally used in the market to dewater sludge. However, the existing decanter centrifuge requires high-speed rotation of the drum and multiple bearings and differentials for use, and the structure is complex. At the same time, the operating cost is also higher.

To this end, this application proposes a river bottom sludge dehydration device that uses a simple structure to achieve centrifugal dehydration of sludge and simultaneously achieves a filter press effect to solve the above technical problems.

Contents of the invention

The main purpose of the present invention is to provide a river bottom sludge dewatering device with a simple structure that can perform centrifugal dewatering of the sludge and simultaneously perform a filter press on the sludge to reduce the dewatering moisture content of the sludge.

The present invention adopts the following technical solutions to solve the above technical problems:

A river bottom sludge dewatering device, including:

An installation frame body, which is provided with a water collection tank for collecting water flow after sludge dehydration and a mud collection tank for collecting mud cake after sludge dehydration;

A centrifugal limit housing is provided on the mounting frame body, and the bottom of the centrifugal limit housing is provided with a drainage pipe for discharging water after sludge dewatering;

The centrifugal drive assembly is installed obliquely on the centrifugal limit housing and is used for centrifugal dehydration of river bottom silt;

A feeding component is provided on the mounting frame body for sludge feeding of the centrifugal drive component;

The filter press push-out assembly is arranged on the centrifugal drive assembly and is connected to the feed assembly. It is used to press-filter the centrifuged and dehydrated mud cake while the centrifugal drive assembly is running and push the filter-pressed mud cake into the mud collection. groove.

Preferably, the centrifugal drive assembly includes a centrifugal mounting base 1 and a centrifugal mounting base 2 rotating at both ends of the centrifugal limiting housing, and multiple sets of centrifugal sleeves fixedly penetrated on the centrifugal mounting base 1 and the centrifugal mounting base 2 and arranged in parallel. tube, a plurality of water filter holes provided on the centrifugal sleeve, a centrifugal shaft fixedly penetrated in the middle of the centrifugal mounting base one and the second centrifugal mounting base, and a driving member provided at one end of the centrifugal shaft for driving the centrifugal shaft to rotate.

Preferably, the centrifugal drive assembly further includes a limiting ring block provided on the centrifugal mounting base 1 and the centrifugal mounting base 2 for limiting the rotation of the centrifugal mounting base 1 and the centrifugal mounting base 2 on the centrifugal limiting housing.

Preferably, the feed assembly includes a material distribution pipe provided on the centrifugal mounting base 1 and located outside the centrifugal shaft, a plurality of material distribution housings provided on the material distribution pipe and communicated with the inside of the centrifugal casing in one-to-one correspondence, An installation pipe is provided on the installation frame body and sleeved on the outside of the centrifugal shaft for communicating with the material distribution pipe, and a feeding funnel is provided on the installation pipe for sludge feeding. There is a passage between the installation pipe and the material distribution pipe. The limiting components are connected, and the driving part is installed on the installation pipe.

Preferably, the limiting assembly includes a rotating ring block arranged outside one end of the installation pipe, a plurality of clamping blocks arranged at one end of the material distribution pipeline, and a clamping block arranged on the clamping block for engaging the rotating ring block to limit rotation. groove, a ball groove arranged in the card groove and a connecting ball located in the ball groove for rolling on the rotating ring block.

Preferably, the filter press push-out assembly includes a blade rotating shaft that rotates through the material distribution housing and is located in the centrifugal casing, a spiral blade that is arranged on the blade rotating shaft and rotates in the centrifugal casing, and a blade that is arranged on the centrifugal casing to limit the blades. The limiting frame body of the rotating shaft rotates, the connecting gear arranged at one end of the blade rotating shaft, and the connecting gear ring arranged on the installation pipe for meshing connection with the connecting gear.

Preferably, the spiral pitch of the spiral blades gradually becomes narrower along the direction from the centrifugal mounting seat to the centrifugal mounting seat.

Preferably, the feed assembly further includes a rotation limiter provided on the material distribution housing for the blade shaft to rotate on the material distribution housing.

Preferably, the filter press push-out assembly further includes a partition provided on the centrifugal mounting base 1 for separating the overall positions of the plurality of connecting gears when they rotate.

The invention provides a river bottom sludge dewatering device. Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The invention has a simple structure and is easy to manufacture. It can continuously feed sludge for dehydration operations, and can rotate the centrifugal shaft while driving the blade shaft through the matching connection of the feeding assembly and the meshing of the connecting ring and the connecting gear. Rotate, so that the interconnected centrifugal drive assembly and the filter press push-out assembly are driven synchronously, so that the overall device can perform centrifugal dehydration of the sludge while also performing a filter press treatment on the sludge to reduce the moisture content of the sludge after the centrifugal dehydration operation. Ensure the dewatering efficiency of sludge.

2. The present invention sends the sludge into the centrifugal casing, drives the centrifugal shaft to rotate, and cooperates with the two sets of centrifugal mounting seats to effectively perform centrifugal dehydration of the sludge in the centrifugal casing. The dehydrated water can be quickly discharged through the drainage pipe to avoid dehydration. During the process, the water flow continues to contact the sludge, resulting in poor dewatering effect, which improves the centrifugal dehydration efficiency of the sludge.

3. The present invention sets rotating spiral blades in the centrifugal casing. Since the spiral pitch of the spiral blades gradually narrows along the direction of the centrifugal mounting base, the spiral blades can cooperate with gravity during the centrifugal dehydration of sludge. It provides the sludge with the thrust for sludge discharge, and at the same time can use the gradually narrowing spacing to squeeze the centrifugally dewatered sludge to a certain extent, thereby achieving the filtering effect during sludge transportation and improving the overall dehydration effect of the sludge.

4. In the present invention, a plurality of material distribution shells are arranged outside the material distribution pipe and connected to the centrifugal casing, and the centrifugal shaft is used to control the rotation of the two sets of centrifugal mounting seats, which will also drive the material distribution pipe and the material distribution shell to rotate synchronously. The powder pipeline is limited and rotated on the installation pipe through the limit component. Therefore, when the sludge enters the distribution pipe through the feed funnel and the installation pipe in sequence, the centrifugal force and gravity can be used to evenly send the sludge into the distribution housing and then into the centrifugal sleeve. The centrifugal dehydration operation is carried out in the tube to ensure the normal centrifugal dehydration feeding of sludge.

Description of the drawings

The description and drawings that constitute a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is an overall perspective view 1 of the present invention;

Figure 2 is an overall perspective view 2 of the present invention;

Figure 3 is an overall three-dimensional schematic diagram of the connection structure of the centrifugal drive assembly of the present invention;

Figure 4 is an exploded perspective view of the connection structure of the centrifugal drive assembly of the present invention;

Figure 5 is an overall three-dimensional schematic diagram of the connection structure of the filter press push-out assembly of the present invention;

Figure 6 is a first three-dimensional schematic view of the connection structure of the centrifugal drive assembly of the present invention;

Figure 7 is a second perspective view of the overall connection structure of the centrifugal drive assembly of the present invention;

Figure 8 is a schematic second perspective view of part of the structure of the feeding assembly of the present invention;

Figure 9 is a schematic three-dimensional cross-sectional view of the limiting component of the present invention.

In the picture:

1. Installation frame; 11. Collection tank; 12. Mud collection tank; 2. Centrifugal limit housing; 21. Drainage pipe; 3. Feeding component; 31. Feeding funnel; 32. Installation pipe; 33. Points Material pipeline; 34. Limiting component; 341. Rotating ring block; 342. Clamping block; 343. Clamping groove; 344. Ball groove; 345. Connecting balls; 35. Distribution housing; 36. Rotating limiter; 4 , Centrifugal drive assembly; 41. Driving piece; 42. Centrifugal shaft; 43. Centrifugal mounting seat one; 44. Centrifugal mounting seat two; 45. Centrifugal sleeve; 46. Water filter hole; 47. Limiting ring block; 5. Press filter push-out assembly; 51. Spiral blade; 52. Blade rotating shaft; 53. Limiting frame body; 54. Connecting gear; 55. Connecting gear ring; 56. Separator.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. The embodiments and features in the embodiments in this application may be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

In the embodiment, see Figure 1 to Figure 9 for details.

As shown in Figures 1 to 4, the present invention provides a river bottom sludge dehydration device, including:

The installation frame body 1 is provided with a water collection tank 11 for collecting water flow after sludge dehydration and a mud collection tank 12 for collecting mud cake after sludge dehydration;

The centrifugal limit housing 2 is installed obliquely on the mounting frame body 1. The bottom of the centrifugal limit housing 2 is provided with a drainage pipe 21 for discharging water after sludge dewatering;

The centrifugal drive assembly 4 is provided on the centrifugal limit housing 2 and is used for centrifugal dehydration of river bottom silt;

The feeding assembly 3 is provided on the mounting frame body 1 for sludge feeding of the centrifugal drive assembly 4;

The filter press push-out assembly 5 is arranged on the centrifugal drive assembly 4 and connected to the feed assembly 3. It is used to perform filter press processing on the centrifuged and dehydrated mud cake while the centrifugal drive assembly 4 is running and press the filtered mud cake. Push into the mud collection tank 12.

In the specific implementation, after the sludge enters the device through the feeding assembly 3, the dehydration operation can be performed through the synchronous driving of the centrifugal driving assembly 4 and the filter press pushing assembly 5. The water flow after the sludge is dehydrated enters the centrifugal limit housing 2 through the drainage pipe 21 The dewatered mud cake is collected in the collecting tank 11 and is discharged from the centrifugal limit housing 2 through the filter press pushing assembly 5 in conjunction with gravity, and falls into the mud collecting tank 12 for collection.

As shown in Figures 4, 6 and 7, the centrifugal drive assembly 4 includes a centrifugal mounting base 43 and a centrifugal mounting base 2 44 that rotate at both ends of the centrifugal limiting housing 2. Multiple sets of centrifugal sleeves 45 arranged in parallel on the second centrifugal mounting base 44, a plurality of water filter holes 46 provided on the centrifugal sleeves 45, and centrifugal holes fixedly penetrated through the middle parts of the first centrifugal mounting base 43 and the second centrifugal mounting base 44. The rotating shaft 42 and the driving member 41 provided at one end of the centrifugal rotating shaft 42 for driving the centrifugal rotating shaft 42 to rotate.

Specifically, the driving member 41 controls the rotation of the centrifugal shaft 42 to drive the centrifugal mounting base 1 43 and the centrifugal mounting base 2 44 to rotate. Since the centrifugal sleeve 45 is fixedly clamped on the centrifugal mounting base 43 and the centrifugal mounting base 2 44, when When the centrifugal shaft 42 rotates, the centrifugal sleeve 45 can also perform centrifugal rotation with the centrifugal shaft 42 as the rotation axis to complete the dehydration operation. Compared with the traditional screw dehydration centrifuge, it can have a better centrifugal dehydration effect and reduce the consumption of the same dehydration effect. It can use less equipment, save resources, and greatly reduce operating costs.

During implementation, by sending the sludge into the centrifugal casing 45 and driving the centrifugal shaft 42 to rotate, in conjunction with two sets of centrifugal mounting seats, the sludge in the centrifugal casing 45 can be effectively centrifuged and dehydrated, and the dehydrated water can quickly pass through the drainage system. Pipe 21 is discharged to prevent the water from continuously contacting the sludge during the dehydration process, resulting in poor dewatering effect, and improves the centrifugal dehydration efficiency of the sludge.

It should be noted that the position of the driving member 41 is fixed, and the centrifugal shaft 42 is only installed on the rotational drive shaft of the driving member 41. The driving member 41 here can directly use a servo motor as shown in the figure, or other rotating components. A motor structure or other mechanical structure that drives the effect.

In addition, the centrifugal drive assembly 4 also includes a limiting ring provided on the centrifugal mounting base 43 and the centrifugal mounting base 2 44 to limit the rotation of the centrifugal mounting base 43 and the centrifugal mounting base 2 44 on the centrifugal limiting housing 2 Block 47, when the first centrifugal mounting base 43 and the second centrifugal mounting base 44 rotate, the limiting ring block 47 can also support the first centrifugal mounting base 43 and the second centrifugal mounting base 44, thereby improving the overall strength of the device.

It should be noted that the limit ring block 47 can either be set to rotate outside the centrifugal limit housing 2 as shown in the figure, or it can be limited to rotate on the inner wall of the centrifugal limit housing 2. In this case, the centrifugal limit must be ensured. The connection between the housing 2 and the two sets of centrifugal mounting seats is waterproof.

As shown in Figures 3, 5, 7 and 8, the feed assembly 3 includes a distribution pipe 33 provided on the centrifugal mounting base 43 and located outside the centrifugal shaft 42. A plurality of material distribution housings 35 connected in a one-to-one correspondence inside the casing 45, an installation pipe 32 provided on the mounting frame body 1 and sleeved on the outside of the centrifugal shaft 42 for communicating with the material distribution pipe 33, and an installation pipe 32 provided on the installation pipe 32 There is a feeding funnel 31 for sludge feeding, the installation pipe 32 and the distribution pipe 33 are connected through a limiting assembly 34, and the driving member 41 is installed on the installation pipe 32.

In the specific implementation, a plurality of material distribution housings 35 connected to the centrifugal sleeve 45 are located outside the material distribution pipe 33 and are evenly distributed in an annular shape. The center of the ring is the position of the material distribution pipe 33. At this time, the centrifugal shaft 42 is used to control the two materials. When the centrifugal mounting base rotates, it will drive the material distribution pipe 33 and the material distribution housing 35 to rotate synchronously. Since the powder pipe is limited to rotate on the installation pipe 32 through the limit assembly 34, when the sludge passes through the feed funnel 31 and After the installation pipe 32 enters the material distribution pipe 33, the centrifugal force and gravity can be used to evenly send the sludge into the material distribution housing 35 and then into the centrifugal sleeve 45 for centrifugal dehydration operation, ensuring normal centrifugal dehydration feeding of the sludge.

As shown in Figure 9, the limiting assembly 34 includes a rotating ring block 341 provided outside one end of the installation pipe 32, a plurality of clamping blocks 342 provided at one end of the distribution pipe 33, and a plurality of clamping blocks 342 arranged on the clamping block 342 for engaging and rotating. The ring block 341 has a clamping groove 343 for limiting rotation, a ball groove 344 provided in the clamping groove 343, and a connecting ball 345 located in the ball groove 344 for rolling on the rotating ring block 341.

When the centrifugal mounting seat drives the material distribution pipe 33 and the material distribution housing 35 to rotate synchronously, since the installation pipe 32 is fixed in position through the mounting frame body 1, when the material distribution pipe 33 rotates at one end of the installation pipe 32, the clamping groove 343 and the rotation The engagement of the ring block 341 can limit the rotation position of the material distribution pipe 33. At this time, the connecting ball 345 can ensure that the friction between the material distribution pipe 33 and the rotating ring block 341 is greatly reduced when the material distribution pipe 33 rotates, thereby improving the efficiency of the material distribution pipe. 33, it should be noted that although the rotating ring block 341 is engaged in the slot 343, there is still a gap between the rotating ring block 341 and the inner wall of the slot 343, and the rotating ring block 341 is only in contact with the connecting ball 345. To ensure the normal rotation of the rotating ring block 341.

As shown in Figures 4 and 5, the filter press push-out assembly 5 includes a blade rotating shaft 52 that rotates through the material distribution housing 35 and is located in the centrifugal sleeve 45, and a spiral blade that is disposed on the blade rotating shaft 52 and rotates in the centrifugal sleeve 45. 51. The limiting frame 53 provided on the centrifugal sleeve 45 for limiting the rotation of the blade shaft 52, the connecting gear 54 provided on one end of the blade shaft 52, and the connecting gear 54 provided on the installation pipe 32 for meshing connection with the connecting gear 54. Connect the ring gear 55.

Since the connecting ring gear 55 is fitted and installed on the installation pipe 32, and since the connecting ring gear 55 is fixed in position and posture through the connection limiter of the installation pipe 32, the connecting ring gear 55 is used while the driving member 41 controls the rotation of the centrifugal shaft 42. The centrifugal shaft 42 meshed with the connecting gear 54 rotates while driving the blade shaft 52 to rotate, so that the interconnected centrifugal drive assembly 4 and the filter press push-out assembly 5 are driven synchronously, that is, both sets of centrifugal mounting seats are controlled to drive the centrifugal sleeves. It rotates to dehydrate, and drives the spiral blade 51 to rotate inside the centrifugal sleeve, and cooperates with gravity to complete the push-out of the sludge cake after sludge dehydration.

At this time, the spiral pitch of the spiral blades 51 gradually becomes narrower along the direction of the centrifugal mounting base 43 toward the second centrifugal mounting base 44. Therefore, during the centrifugal dehydration of sludge, the spiral blades 51 can cooperate with gravity to provide thrust for sludge discharge, and at the same time The gradually narrowing spacing can also be used to squeeze the centrifugally dehydrated sludge to a certain extent and cooperate with the filter holes 46 of the centrifugal sleeve to complete the filtration process of the sludge, thereby achieving the filter press effect during sludge transportation to reduce the centrifugal dehydration of the sludge. The moisture content after operation ensures the dehydration efficiency of the sludge and improves the overall dehydration effect of the sludge.

In addition, in one embodiment, as shown in FIG. 8 , the feeding assembly 3 also includes a rotation limiter 36 provided on the material distribution housing 35 for the blade shaft 52 to rotate on the material distribution housing 35 .

Specifically, the rotation limiter 36 can limit the rotation of the blade shaft 52 through the material distribution housing 35 and into the centrifugal sleeve to drive the threaded blades to rotate, ensuring the normal operation of the entire device. Therefore, the rotation limiter 36 here can be set It is a ball bearing to improve the rotation effect of the blade shaft 52, and a limit sleeve with a waterproof strip on the outside can also be used to improve the sealed waterproof performance of the centrifugal limit housing 2 of the device and avoid water from flowing out of the limit sleeve during the centrifugal process. Leaking from the barrel.

In addition, in one embodiment, as shown in FIG. 3 , the filter press push-out assembly 5 further includes a partition 56 provided on the centrifugal mounting base 43 for separating the overall positions of the plurality of connecting gears 54 when they rotate.

Specifically, the partition 56 mainly separates and ensures the normal rotation of the different connecting gears 54. Therefore, the partition 56 can only use a partition plate as shown in the figure, or can be set as a shell structure to limit the rotation position of the connecting gear 54. Improve the rotation stability of the connecting gear 54 and ensure the overall strength of the device during operation.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

In addition, it should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the functions of each component in a specific posture. The relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving “first”, “second”, etc. in the embodiments of the present invention, the descriptions of “first”, “second”, etc. are only for descriptive purposes and shall not be understood as indications or implications. Its relative importance or implicit indication of the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the entire text includes three parallel solutions. Taking "A and/or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time. In addition, in the embodiment of the present invention, "plurality" refers to two or more. In addition, the technical solutions in various embodiments can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist. , nor within the protection scope required by the present invention.

Claims (9)

1. A river bottom sludge dewatering device, comprising:

the device comprises a mounting frame body (1), wherein a water receiving tank (11) for collecting water flow after sludge dehydration and a sludge receiving tank (12) for collecting sludge cakes after sludge dehydration are arranged on the mounting frame body (1);

the centrifugal limiting shell (2) is obliquely arranged on the mounting frame body (1), and a drain pipe (21) for draining water flow after sludge dehydration is arranged at the bottom of the centrifugal limiting shell (2);

the centrifugal driving assembly (4) is arranged on the centrifugal limiting shell (2) and is used for centrifugal dehydration treatment of river bottom sludge;

the feeding assembly (3) is arranged on the mounting frame body (1) and used for feeding sludge of the centrifugal driving assembly (4);

the filter pressing pushing-out assembly (5) is arranged on the centrifugal driving assembly (4) and connected with the feeding assembly (3) and is used for carrying out filter pressing treatment on the mud cake after centrifugal dehydration and pushing the mud cake after filter pressing into the mud collecting groove (12) while the centrifugal driving assembly (4) is operated.

2. The river bottom sludge dewatering device as claimed in claim 1, wherein the centrifugal driving assembly (4) comprises a first centrifugal mounting seat (43) and a second centrifugal mounting seat (44) which are rotatably arranged at two ends of the centrifugal limiting shell (2), a plurality of groups of centrifugal sleeves (45) fixedly penetrating through the first centrifugal mounting seat (43) and the second centrifugal mounting seat (44) and arranged in parallel, a plurality of water filtering holes (46) arranged on the centrifugal sleeves (45), a centrifugal rotating shaft (42) fixedly penetrating through the middle parts of the first centrifugal mounting seat (43) and the second centrifugal mounting seat (44), and a driving piece (41) arranged at one end of the centrifugal rotating shaft (42) and used for driving the centrifugal rotating shaft (42) to rotate.

3. The river bottom sludge dewatering device as claimed in claim 2, wherein the centrifugal driving assembly (4) further comprises a limiting ring block (47) arranged on the first centrifugal mounting seat (43) and the second centrifugal mounting seat (44) for limiting rotation of the first centrifugal mounting seat (43) and the second centrifugal mounting seat (44) on the centrifugal limiting shell (2).

4. River bottom sludge dewatering device as claimed in claim 2, characterized in that the feeding assembly (3) comprises a distributing pipeline (33) arranged on a first centrifugal mounting seat (43) and positioned outside the centrifugal rotating shaft (42), a plurality of distributing shells (35) arranged on the distributing pipeline (33) and communicated with the inside of the centrifugal sleeve (45) in a one-to-one correspondence manner, a mounting pipeline (32) arranged on the mounting frame body (1) and sleeved outside the centrifugal rotating shaft (42) and used for communicating the distributing pipeline (33), and a feeding funnel (31) arranged on the mounting pipeline (32) and used for feeding sludge, wherein the mounting pipeline (32) and the distributing pipeline (33) are connected through a limiting assembly (34), and the driving piece (41) is arranged on the mounting pipeline (32).

5. The river bottom sludge dewatering device as claimed in claim 4, wherein the limiting assembly (34) comprises a rotating ring block (341) arranged at the outer side of one end of the installation pipeline (32), a plurality of clamping blocks (342) arranged at one end of the material distribution pipeline (33), clamping grooves (343) arranged on the clamping blocks (342) for clamping the rotating ring block (341) for limiting rotation, ball grooves (344) arranged in the clamping grooves (343) and connecting balls (345) arranged in the ball grooves (344) for rolling on the rotating ring block (341).

6. The river bottom sludge dewatering device as claimed in claim 4, wherein the filter pressing pushing assembly (5) comprises a blade rotating shaft (52) which rotates through the material distributing casing (35) and is positioned in the centrifugal sleeve (45), a spiral blade (51) which is arranged on the blade rotating shaft (52) and rotates in the centrifugal sleeve (45), a limiting frame body (53) which is arranged on the centrifugal sleeve (45) and used for limiting the rotation of the blade rotating shaft (52), a connecting gear (54) which is arranged at one end of the blade rotating shaft (52) and a connecting toothed ring (55) which is arranged on the mounting pipeline (32) and used for being in meshed connection with the connecting gear (54).

7. The river bottom sludge dewatering device as claimed in claim 6, wherein the screw pitch of the screw blades (51) is gradually narrowed along the direction from the first centrifugal mounting seat (43) to the second centrifugal mounting seat (44).

8. The river bottom sludge dewatering device as claimed in claim 6, wherein the feed assembly (3) further comprises a rotation limiter (36) provided on the distribution housing (35) for rotating the blade rotation shaft (52) on the distribution housing (35).

9. The river bottom sludge dewatering apparatus as claimed in claim 6, wherein the filter-press pushing assembly (5) further comprises a partitioning member (56) provided on the centrifugal mounting base (43) for partitioning the overall position of the plurality of connecting gears (54) when rotated.