CN110670657A

CN110670657A - Dredging equipment for narrow river channel

Info

Publication number: CN110670657A
Application number: CN201910951616.XA
Authority: CN
Inventors: 龚柏森
Original assignee: Nantong Wandu Construction Engineering Co Ltd
Current assignee: Nantong Wandu Construction Engineering Co Ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-01-10
Anticipated expiration: 2039-10-09
Also published as: CN110670657B

Abstract

The invention relates to a dredging device for a narrow river channel, which comprises a transport ship, wherein a cross frame is arranged on the transport ship, one end of the cross frame extends out of the transport ship, and the extending end is connected with two symmetrically distributed shaft sleeves, vertical guide posts are respectively arranged in the two shaft sleeves in a penetrating way, the lower ends of the two guide posts are connected with a mud suction box, a central shaft is connected in the mud suction box in a rotating way, a plurality of cutters are circumferentially arranged on the central shaft, one end of the mud suction box is connected with a driving box, one end of the driving box close to the mud suction box is provided with a mounting hole, a waterproof bearing is fixed in the mounting hole, a waterproof motor and a speed reducer are arranged in the driving box, the motor shaft of the waterproof motor is connected with the input shaft of the speed reducer, the output shaft of the speed reducer is fixedly connected with the inner ring, and one end of the extension is connected with the central shaft, and the driving box is connected with an end cover for closing the box opening through a fastening screw. The invention has the effect of improving the dredging efficiency.

Description

Dredging equipment for narrow river channel

Technical Field

The invention relates to the technical field of river channel dredging equipment, in particular to dredging equipment for a narrow river channel.

Background

River channel desilting generally refers to the treatment of river channels, and belongs to hydraulic engineering. The silt deposited at the river bottom is blown and stirred into turbid water through mechanical equipment and flows away along with river water, so that the dredging function is achieved. River channel siltation increasingly affects the normal performance of various functions such as flood control, waterlogging drainage, irrigation, water supply, navigation and the like, and people need to actively carry out river channel dredging engineering to restore the normal functions of the river channel, so that the river channel becomes deeper and wider through treatment, and river water becomes clear.

Chinese patent with publication number CN206428747U discloses a river dredging equipment, which belongs to the technical field of hydraulic engineering, including two dredging vehicles and dredging devices arranged on the banks on both sides of the river, the dredging device comprises a floating plate floating on the river surface, a walking frame is fixedly arranged below the floating plate through two roller frames, a walking mechanism is arranged in the walking frame, the dredging vehicles are placed on the guide rails on the banks, a support rod is arranged on the dredging vehicle, a roller frame II is arranged on the support rod, the roller frame II is passed, the roller frame I and a pair of rollers are provided with a mud suction pipe, the bottom end of the mud suction pipe is connected with a mud suction disc, and the other end of the mud suction pipe is connected with a mud suction pump arranged on the dredging vehicle.

However, the mud sucking disc of the dredging equipment adopts a direct suction mode, when the hardness of the mud is higher, the adhesion force of the mud is increased, and the mud is not easy to suck, so that the dredging efficiency is easily reduced.

Disclosure of Invention

The invention aims to provide dredging equipment for a narrow river channel, which has the advantages that: the dredging efficiency is improved.

The technical purpose of the invention is realized by the following technical scheme: a dredging device for a narrow river channel comprises a transport ship, wherein a cross frame is arranged on the transport ship, one end of the cross frame extends out of the transport ship, the extending end of the cross frame is connected with two shaft sleeves which are symmetrically distributed, vertical guide pillars are arranged in the two shaft sleeves in a penetrating way, the lower ends of the two guide pillars are connected with a mud suction box, a central shaft is connected in the mud suction box in a rotating way, a plurality of cutters are circumferentially arranged on the central shaft, one end of the mud suction box is connected with a driving box, one end of the driving box, which is close to the mud suction box, is provided with a mounting hole, a waterproof bearing is fixed in the mounting hole, a waterproof motor and a speed reducer are arranged in the driving box, a motor shaft of the waterproof motor is connected with an input shaft of the speed reducer, an output shaft of the speed reducer is fixedly connected with an inner ring of the waterproof bearing, the driving box is connected with an end cover for closing the box opening through a fastening screw; the transport ship is provided with a lifting piece for driving the sludge suction box to move;

the transport ship is provided with a delivery pump, the inlet and the outlet of the delivery pump are respectively connected with a mud suction pipe and a mud discharge pipe, and the mud suction pipe is connected with a mud suction box.

Through adopting above-mentioned technical scheme, during the desilting, the operator starts waterproof motor earlier, drive the center pin rotation after the speed reducer transmission, then will inhale the mud case through the lift piece and immerse in the aquatic, until cutter and river course bottom contact, the cutter cuts the silt of river course bottom, the breakage, mix, make silt upwards turn over and gush, the delivery pump starts this moment, make the suction tube aspirate the silt of turning over and gushing, the resistance of silt suction has been reduced, the efficiency of desilting has both been improved, the accommodation of equipment to different hardness silt has been increased again.

The invention is further configured to: the lifting piece comprises a base arranged on the transport ship, a winding roller connected to the base in a rotating mode and a driving motor arranged on the base, a traction rope is wound on the winding roller, one end of the traction rope is connected with the mud suction box, and a motor shaft of the driving motor is connected with the winding roller.

Through adopting above-mentioned technical scheme, driving motor starts, drives the wind-up roll and rotates, and the wind-up roll winding or release haulage rope, alright make the corresponding rising of mud sucking box or descend simple and convenient.

The invention is further configured to: the mud suction box is vertically provided with a plurality of studs, a plurality of balancing weights are arranged on the studs in a penetrating mode, and the studs are connected with fixing nuts through threads.

By adopting the technical scheme, an operator can adjust the whole weight of the sludge suction box by increasing or decreasing the number of the balancing weights so as to reduce the possibility that the cutter floats up and down in the sludge suction box during working.

The invention is further configured to: the top end of the guide pillar is connected with a stroke limiting block through a first fixing screw, a telescopic pipe is sleeved outside the guide pillar, sealing gaskets are arranged at two ends of the telescopic pipe, two ends of the telescopic pipe are connected with the shaft sleeve and the mud suction box through hexagonal screws, and gaskets are arranged on the hexagonal screws in a penetrating mode.

By adopting the technical scheme, the stroke limiting block prevents the guide pillar from being separated from the shaft sleeve when the guide pillar descends; the telescopic pipe separates the guide post from water, and plays a role in protecting the guide post.

The invention is further configured to: the shaft sleeve is rotatably connected with the cross frame, a hydraulic cylinder is hinged to the cross frame, a piston rod of the hydraulic cylinder is hinged to the shaft sleeve, and a plurality of limiting screws are connected to the shaft sleeve in a threaded mode.

Through adopting above-mentioned technical scheme, the operator starts the pneumatic cylinder, and the piston rod shrink of pneumatic cylinder drives the axle sleeve and rotates for the guide pillar drives inhales the mud case and rotates, and the angle of adjustable center pin makes the cutter laminate mutually with the slope of river course bottom, and on the other hand also can make the guide pillar rotate to the horizontal direction, and the desilting of being convenient for is over and is put in order, saves its occupation space.

The invention is further configured to: the mud suction box is characterized in that the conveying pump is provided with a plurality of mud suction pipes, one ends of the mud suction pipes, far away from the conveying pump, are connected through a collecting pipe, and a plurality of shunt pipes are connected between the collecting pipe and the mud suction box.

By adopting the technical scheme, the plurality of delivery pumps simultaneously perform pumping operation, so that the dredging efficiency is improved; when one shunt pipe is blocked, the other shunt pipes can still suck normally, so that the dredging operation is carried out continuously.

The invention is further configured to: the both ends of collecting pipe all are equipped with the bracing piece perpendicularly, the bracing piece is kept away from the one end of collecting pipe and is connected with inhaling the mud case.

Through adopting above-mentioned technical scheme, through the support of bracing piece to the back flow, fixed, increased the steadiness that shunt tubes both ends are connected.

The invention is further configured to: be equipped with in the transport ship and store up the mud case, it is used for sealing the sealed lid of case mouth to be connected with through second set screw on the mud case to store up, each the play mud pipe all is connected with the mud case through the flange, it is equipped with a plurality of partition frames of arranging in proper order along length direction in the mud case to store up, each all be connected with the filter screen in the partition frame, the mesh number of filter screen increases in proper order along keeping away from out the mud pipe direction, the one end that the play mud pipe was kept away from to the mud case of storage is connected with the raceway that extends to the transport ship outside.

By adopting the technical scheme, the sludge pumped out by the sludge suction pipe is discharged into the sludge storage tank through the sludge outlet pipe, the sludge is filtered layer by the filter screen, and the filtered water is discharged into the river channel through the water delivery pipe to form a cycle, so that the loading capacity of the transport ship is reduced, and the time required by subsequent treatment is saved; the mesh number of the filter screens is gradually reduced, so that the sludge can quickly pass through at the beginning, and the pressure in the sludge outlet pipe is reduced; in addition, go out the mud pipe and pass through the flange and can dismantle the connection with storing up the mud case, fill the back when storing up the mud case, the operator lifts off the flange, will store up the whole mud case of hanging to the bank, the storage mud case of more renewing, and is convenient nimble.

The invention is further configured to: one end of the sludge storage box close to the sludge outlet pipe is connected with a pressure relief pipe, and a valve is arranged on the pressure relief pipe.

Through adopting above-mentioned technical scheme, when mud pipe internal pressure was too big, the operator opened the valve, will go out the intraductal partial silt of mud and discharge, the safety of guarantee pipeline.

The invention is further configured to: and water guide arc surfaces are arranged on two sides of the mud suction box, which are opposite to each other.

Through adopting above-mentioned technical scheme, the water guide cambered surface does benefit to and reduces the resistance that receives when the suction box removes in the aquatic.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the rotary cutter is used for cutting, crushing and stirring the sludge at the bottom of the river channel, so that the suction of the sludge suction pipe is facilitated, the possibility of blockage of the pipeline is reduced, and the suction operation is simultaneously carried out by matching with a plurality of delivery pumps, so that the dredging efficiency is improved;

2. the situation that the dredging work is influenced by the blockage of any shunt pipe is reduced through the matching of the shunt pipe and the return pipe; the pumped sludge is filtered and separated on the transport ship, so that the loading capacity of the transport ship is reduced, and the time required by subsequent sludge treatment is saved.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

Fig. 2 is a schematic structural diagram of the lifting member according to the embodiment.

Fig. 3 is a schematic structural diagram of the mud suction box and the central shaft according to the embodiment.

Fig. 4 is an enlarged view of a in fig. 3.

Fig. 5 is an enlarged view of fig. 3 at B.

Fig. 6 is a schematic structural diagram of a mud storage tank according to the embodiment.

Fig. 7 is an enlarged view at C in fig. 6.

In the figure, 1, a transport ship; 11. a cross frame; 12. a shaft sleeve; 13. a guide post; 14. a sludge suction box; 15. a central shaft; 151. a cutter; 16. a drive cartridge; 161. mounting holes; 1611. a waterproof bearing; 162. a waterproof motor; 163. a speed reducer; 17. an end cap; 171. fastening screws; 18. a delivery pump; 181. a mud suction pipe; 182. a mud outlet pipe; 2. a lifting member; 21. a base; 22. a wind-up roll; 23. a drive motor; 24. a hauling rope; 25. a hydraulic cylinder; 26. a limit screw; 3. a stud; 31. a balancing weight; 32. fixing a nut; 33. a stroke limiting block; 331. a first set screw; 34. a telescopic pipe; 35. a gasket; 36. a hex screw; 361. a gasket; 4. a collector pipe; 41. a shunt tube; 42. a support bar; 43. a sludge storage tank; 44. a sealing cover; 441. a second set screw; 45. a flange; 46. a separation frame; 461. a filter screen; 47. a water delivery pipe; 48. a pressure relief pipe; 481. a valve; 49. a water guide arc surface.

Detailed Description

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

Example (b): a dredging device for a narrow river channel is shown in figure 1 and comprises a transport ship 1, a delivery pump 18 and a cross frame 11, wherein the delivery pump 18 is arranged on the transport ship 1, and the inlet and the outlet of the delivery pump 18 are respectively connected with a mud suction pipe 181 and a mud outlet pipe 182.

As shown in fig. 2, one end of the transverse frame 11 extends out of the transport ship 1, and extends out one end and is connected with the shaft sleeves 12 on two opposite sides, two shaft sleeves 12 are symmetrically distributed, vertical guide pillars 13 are all penetrated in the two shaft sleeves 12, the upper ends of the two guide pillars 13 are connected with the stroke limiting block 33 through the first fixing screw 331, the length of the stroke limiting block 33 is greater than the diameter of the guide pillar 13, the lower ends of the two guide pillars 13 are connected with the sludge suction box 14, the sludge suction box 14 is rotatably connected with the central shaft 15, a plurality of cutters 151 circumferentially distributed along the axis are arranged on the circumferential side wall of the central shaft 15, the cutters 151 extend out of the opening of the sludge suction box 14, and the sludge suction pipe 181 is connected with the sludge suction box 14 and.

As shown in fig. 3 and 4, one end of the sludge suction box 14 is connected with a driving box 16, one end of the driving box 16 close to the sludge suction box 14 is provided with a mounting hole 161, a waterproof bearing 1611 is fixed in the mounting hole 161, a speed reducer 163 and a waterproof motor 162 are arranged in the driving box 16 along the axial direction of the central shaft 15, a motor shaft of the waterproof motor 162 is connected with an input shaft of the speed reducer 163, an output shaft of the speed reducer 163 penetrates through an inner ring of the waterproof bearing 1611 and then is connected with the central shaft 15, the output shaft of the speed reducer 163 is fixed with the inner ring of the waterproof bearing 1611, and the driving box 16 is connected with an end cover 17 for closing a box opening through a fastening.

As shown in fig. 2, a plurality of studs 3 are disposed on the sludge suction box 14, a plurality of balancing weights 31 are arranged on each stud 3 in a penetrating manner, an operator can adjust the overall gravity of the sludge suction box 14 by increasing the number of the balancing weights 31, a fixing nut 32 is connected to the stud 3 in a threaded manner, and the fixing nut 32 is tightly abutted against the balancing weight 31 to prevent the balancing weight 31 from falling off from the stud 3; in addition, the two sides of the sludge suction box 14 in the length direction are provided with water guide cambered surfaces 49, so that the resistance of the sludge suction box 14 when moving along with the transport ship 1 is reduced.

As shown in fig. 2, a lifting member 2 for driving the sludge suction box 14 to move is arranged on the transport ship 1, the lifting member 2 includes a base 21 arranged on the transport ship 1, a winding roller 22 rotatably connected to the base 21 and a driving motor 23 installed on the base 21, a motor shaft of the driving motor 23 is coaxially connected to the winding roller 22, a traction rope 24 is wound on the winding roller 22, an end of the traction rope 24 is connected to the sludge suction box 14, when the sludge suction box 14 sinks into water, the traction rope 24 is straightened under the gravity action of the sludge suction box 14, the driving motor 23 drives the winding roller 22 to wind or release the traction rope 24, and accordingly the sludge suction box 14 can be driven to correspondingly ascend or descend.

As shown in fig. 2, during dredging, an operator starts the waterproof motor 162, a motor shaft of the waterproof motor 162 drives an input shaft of the speed reducer 163 to rotate, and drives an output shaft to drive the central shaft 15 to rotate, so that each cutter 151 rotates; the driving motor 23 is started, the winding roller 22 releases the traction rope 24, the guide post 13 slides downwards along the shaft sleeve 12, the sludge suction box 14 is sunk into a river, after the rotary cutter 151 is abutted to the bottom of the river channel, the driving motor 23 is suspended, the conveying pump 18 is started, sludge at the bottom of the river is cut by the cutter 151, crushed and stirred and then upwards overturned, and then is sucked by the sludge suction pipe 181, the sludge outlet pipe 182 is discharged, and due to the fact that the upwards overturned sludge is separated from the bottom of the river, the adhesive force of the sludge is reduced, the suction resistance of the sludge is reduced, the sludge cleaning efficiency is further improved, and meanwhile, the possibility that the sludge suction pipe 181 is blocked by large sludge is also reduced.

As shown in fig. 2 and 5, an extension tube 34 is sleeved outside the guide post 13, two ends of the extension tube 34 are respectively connected with the shaft sleeve 12 and the sludge suction box 14 through hexagon screws 36, a part of the guide post 13 located between the shaft sleeve 12 and the sludge suction box 14 is covered, two end surfaces of the extension tube 34 are respectively provided with a sealing gasket 35, and a hole corresponding to the hexagon screw 36 is reserved on the sealing gasket 35 to allow the hexagon screw 36 to pass through; the sealing gasket 35 increases the sealing performance between the end surface of the extension pipe 34 and the shaft sleeve 12 and the mud suction box 14, and reduces the possibility that the surface of the guide post 13 is rusted easily when river water enters the extension pipe 34.

As shown in fig. 2, the conveying pump 18 is provided with a plurality of pipes, one end of each mud suction pipe 181 far away from the conveying pump 18 is connected through a return pipe, the collecting pipe 4 and the mud suction box 14 are parallel to each other, a plurality of shunt pipes 41 distributed along the length direction of the collecting pipe 4 are connected between the collecting pipe 4 and the mud suction box 14, support rods 42 are vertically arranged at two ends of the collecting pipe 4, one end of each support rod 42 far away from the collecting pipe 4 is connected with the mud suction box 14, and the collecting pipe 4 is supported and fixed.

As shown in fig. 6 and 7, a mud storage tank 43 is arranged in the transport ship 1, a sealing cover 44 for sealing a tank opening is connected to the mud storage tank 43 through a second fixing screw 441, one end of the mud storage tank 43 is connected to each mud outlet pipe 182 through a flange 45, the other end of the mud storage tank is connected to a water pipe 47 extending out of the transport ship 1, a plurality of separation frames 46 are arranged in the mud storage tank 43 in sequence along the length direction of the mud storage tank, a filter screen 461 is connected to each separation frame 46, and the mesh number of the filter screen 461 increases in sequence along the direction away from the mud outlet pipe 182, that is, the aperture of the filter screen 461 is gradually reduced; in addition, a pressure relief pipe 48 is connected to one end of the sludge storage tank 43 close to the sludge outlet pipe 182, and a valve 481 is arranged on the pressure relief pipe 48.

As shown in fig. 2, the respective delivery pumps 18 start to operate simultaneously, sludge is sucked into the collecting pipe 4 through the respective shunt pipes 41, then is delivered to the sludge outlet pipe 182 through the respective sludge suction pipes 181, and then flows into the sludge storage tank 43, so that the single suction amount and the delivery speed of the sludge are increased, and when one shunt pipe 41 is blocked, the whole dredging operation can still be normally performed; the sludge flowing into the sludge storage tank 43 is sequentially intercepted and filtered by the filter screens 461 (as shown in fig. 7), and the filtered water is discharged into the river through the water delivery pipe 47, so that the water content in the sludge is reduced, the post-treatment of the sludge is facilitated, and the load of the transport ship 1 is increased.

As shown in fig. 2, if the pressure in the sludge storage tank 43 is too high during the filtering process, the operator can open the pressure relief pipe 48 to discharge part of the sludge directly to the transport ship 1, so as to reduce the overload of the delivery pump 18; when the sludge storage tank 43 is filled with sludge, an operator contacts the connection between the sludge discharge pipe 182 and the sludge storage tank 43, lifts the sludge storage tank 43 out by using a traveling crane on the river bank and replaces the sludge storage tank 43 with a new one, so that the dredging work is continuously performed.

As shown in fig. 2, the shaft sleeve 12 is rotatably connected with the cross frame 11, the cross frame 11 is hinged with two hydraulic cylinders 25, the two hydraulic cylinders 25 respectively correspond to the two shaft sleeves 12, piston rods of the hydraulic cylinders 25 are hinged with the corresponding shaft sleeves 12, and the shaft sleeves 12 are in threaded connection with a plurality of limit screws 26 distributed along the length direction thereof; after silt cleaning is finished, an operator firstly utilizes the lifting piece 2 to lift the mud suction box 14, then screws the limit screw 26 to tightly abut against the guide post 13 to fix the guide post 13, then starts the hydraulic cylinder 25, the piston rod of the hydraulic cylinder 25 contracts to drive the shaft sleeve 12 to rotate, so that the guide post 13 rotates towards the horizontal direction, and at the moment, the two guide posts 13 are distributed on two sides of the transport ship 1, thereby being beneficial to reducing the occupied space and the resistance when the transport ship 1 advances.

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 desilting equipment in narrow river course which characterized in that: the device comprises a transport ship (1), wherein a cross frame (11) is arranged on the transport ship (1), one end of the cross frame (11) extends out of the transport ship (1), the extending end of the cross frame is connected with two symmetrically distributed shaft sleeves (12), vertical guide pillars (13) penetrate through the two shaft sleeves (12), the lower ends of the two guide pillars (13) are connected with a mud suction box (14), a central shaft (15) is rotatably connected in the mud suction box (14), a plurality of cutters (151) are circumferentially arranged on the central shaft (15), one end of the mud suction box (14) is connected with a drive box (16), one end, close to the mud suction box (14), of the drive box (16) is provided with a mounting hole (161), a waterproof bearing (1611) is fixed in the mounting hole (161), a waterproof motor (162) and a speed reducer (163) are arranged in the drive box (16), and a motor shaft of the waterproof motor (162) is connected with an input shaft of the speed reducer (163), an output shaft of the speed reducer (163) is fixedly connected with an inner ring of the waterproof bearing (1611), the output shaft of the speed reducer (163) extends out of the driving box (16), and one extended end of the output shaft is connected with the central shaft (15), and the driving box (16) is connected with an end cover (17) used for closing a box opening through a fastening screw (171); the transport ship (1) is provided with a lifting piece (2) for driving the sludge suction box (14) to move;

the transport ship is characterized in that a conveying pump (18) is arranged on the transport ship (1), an inlet and an outlet of the conveying pump (18) are respectively connected with a mud suction pipe (181) and a mud outlet pipe (182), and the mud suction pipe (181) is connected with a mud suction box (14).

2. The apparatus for dredging a narrow river according to claim 1, wherein: lifting member (2) including setting up base (21) on transport ship (1), rotate wind-up roll (22) of connection on base (21) and install driving motor (23) on base (21), the winding has haulage rope (24) on wind-up roll (22), the one end and the suction dredge case (14) of haulage rope (24) are connected, the motor shaft and the wind-up roll (22) of driving motor (23) are connected.

3. The apparatus for dredging a narrow river according to claim 2, wherein: the mud suction box (14) is vertically provided with a plurality of studs (3), each stud (3) is provided with a plurality of balancing weights (31) in a penetrating mode, and the studs (3) are connected with fixing nuts (32) in a threaded mode.

4. The apparatus for dredging a narrow river according to claim 3, wherein: the top end of the guide post (13) is connected with a stroke limiting block (33) through a first fixing screw (331), an extension tube (34) is sleeved outside the guide post (13), sealing gaskets (35) are arranged at two ends of the extension tube (34), two ends of the extension tube (34) are connected with the shaft sleeve (12) and the mud suction box (14) through hexagon screws (36), and gaskets (361) penetrate through the hexagon screws (36).

5. The apparatus for dredging a narrow river according to claim 1, wherein: the shaft sleeve (12) is rotatably connected with the transverse frame (11), a hydraulic cylinder (25) is hinged to the transverse frame (11), a piston rod of the hydraulic cylinder (25) is hinged to the shaft sleeve (12), and a plurality of limit screws (26) are connected to the shaft sleeve (12) in a threaded mode.

6. The apparatus for dredging a narrow river according to claim 1 or 5, wherein: the conveying pump (18) is provided with a plurality of sludge suction pipes (181), one ends of the sludge suction pipes, which are far away from the conveying pump (18), are connected through a collecting pipe (4), and a plurality of shunt pipes (41) are connected between the collecting pipe (4) and the sludge suction box (14).

7. The apparatus for dredging a narrow river according to claim 6, wherein: the two ends of the collecting pipe (4) are vertically provided with supporting rods (42), and one end, far away from the collecting pipe (4), of each supporting rod (42) is connected with the sludge suction box (14).

8. The apparatus for dredging a narrow river according to claim 1, wherein: be equipped with in transport ship (1) and store up mud case (43), it is connected with sealed lid (44) that are used for sealing the case mouth through second set screw (441) on mud case (43), each mud pipe (182) all are connected with mud case (43) through flange (45), it separates frame (46) that a plurality of edges length direction arranged in proper order to be equipped with in mud case (43), each to separate all to be connected with in frame (46) filter screen (461), the mesh number of filter screen (461) increases in proper order along keeping away from mud pipe (182) direction, the one end that mud pipe (182) were kept away from in mud case (43) is connected with and extends to outer raceway (47) of transport ship (1).

9. The apparatus for dredging a narrow river according to claim 8, wherein: one end of the sludge storage box (43) close to the sludge outlet pipe (182) is connected with a pressure relief pipe (48), and a valve (481) is arranged on the pressure relief pipe (48).

10. The apparatus for dredging a narrow river according to claim 1, wherein: and water guide arc surfaces (49) are arranged on two opposite sides of the sludge suction box (14).