CN107905281B - Wharf bottom dredging machine and dredging method thereof - Google Patents

Wharf bottom dredging machine and dredging method thereof Download PDF

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Publication number
CN107905281B
CN107905281B CN201711138038.5A CN201711138038A CN107905281B CN 107905281 B CN107905281 B CN 107905281B CN 201711138038 A CN201711138038 A CN 201711138038A CN 107905281 B CN107905281 B CN 107905281B
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sludge
dredging
wharf
telescopic rod
hydraulic cylinder
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CN107905281A (en
Inventor
王荣
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China Harbour Engineering Co Ltd
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China Harbour Engineering Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/8808—Stationary installations, e.g. installations using spuds or other stationary supports
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
    • E02F3/9218—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel with jets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
    • E02F3/9225—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel with rotating cutting elements
    • E02F3/9231—Suction wheels with axis of rotation parallel to longitudinal axis of the suction pipe
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • E02F5/282—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with rotating cutting or digging tools
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • E02F5/287—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with jet nozzles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Treatment Of Sludge (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention provides a dredging machine under wharf, comprising: the sliding chute is arranged at the edge of the wharf ground; the lower surface of the support table is provided with a slide rail matched with the slide groove, the support table is provided with a connecting part protruding out of the edge of the wharf ground, and the connecting part is provided with a through hole for the telescopic rod to pass through; the output end of the hydraulic cylinder is connected to the telescopic rod; the motor is arranged at the tail end of the telescopic rod; the dredging component is connected to the output end of the motor and comprises a rod part and at least two stirring fins arranged at the head end of the rod part; and the high-pressure water pump is arranged on the connecting part and is connected to the dredging component through a water pipe. The dredging machine under the wharf is high in dredging efficiency. The invention also provides a dredging method of the dredging machine under the wharf, which completely adopts machinery, only plays the roles of assistance and observation by manpower, and has high dredging efficiency, small potential safety hazard and high quality.

Description

Wharf bottom dredging machine and dredging method thereof
Technical Field
The invention belongs to the field of wharfs, and particularly relates to a dredging machine under a wharf and a dredging method thereof.
Background
With the rapid development of port construction volume in China, a large number of newly built wharfs and berths are rapidly put into operation, and meanwhile, the safety performance of the wharf structure is reduced due to long-time sedimentation of soil bodies near the wharf, so that the special dredging work of dredging below the wharf is particularly important. There is intensive pile crowd structure port high pile pier below, under the time factor, receives tide, stormy waves to hold mud or pier alongside the influence such as upgrading, needs to clear up the construction to siltation and original state soil below the pier, because the space is narrow, leads to some big-and-middle-sized ripe dredging equipment can't carry out the operation. And the specialized dredging equipment introduced from abroad has high price and low return on investment. At present, the dredging engineering is mainly implemented by directly sucking a slurry pump and flushing the slurry pump by a manual high-pressure water gun, so that the working efficiency is low, the potential safety hazard is large, and the quality control degree is poor.
Disclosure of Invention
In view of the above-mentioned problems, the present invention provides an under-dock silt remover, comprising:
a chute provided at and extending along the dock floor edge such that the under dock silt cleaner can move along the dock edge;
the lower surface of the support table is provided with a slide rail matched with the slide groove, the support table is provided with a connecting part protruding out of the edge of the wharf ground, and the connecting part is provided with a through hole for the telescopic rod to pass through;
the hydraulic cylinder is arranged on the connecting part, the output end of the hydraulic cylinder is connected to the telescopic rod, the hydraulic cylinder drives the telescopic rod to move downwards, dredging operation at different depths can be performed, and the telescopic length of the telescopic rod can be accurately controlled by controlling the opening and closing of the hydraulic cylinder, so that the dredging operation can be accurately performed;
the motor is arranged at the tail end of the telescopic rod and is provided with a waterproof shell, so that the motor can still normally work in the sludge under the wharf;
the dredging component is connected with the output end of the motor and comprises a rod part and at least two stirring fins arranged at the head end of the rod part, each stirring fin comprises a right-angled trapezoid part positioned above and a rectangular part positioned below, wherein the length of the top side of the right trapezoid part is greater than that of the bottom side, the length of the bottom side is equal to that of the rectangular part, a plurality of stirring convex strips which are mutually spaced and arranged in parallel are arranged on two side walls of each stirring fin, and the stirring convex strips on the two side walls are arranged in a mirror image manner, the rectangular part below the stirring fin can firstly scatter the sludge, the trapezoidal part above the stirring fin can stir the sludge, furthermore, the silt is convenient to remove, and the stirring convex strips on the two side walls are arranged in a mirror image manner, so that a vortex can be formed in the silt, and the silt is loose and is convenient to remove;
high pressure water pump, it sets up on the connecting portion, just high pressure water pump leads to pipe connection to the desilting part, and high pressure water pump can be with high-pressure rivers towards silt, further breaks up, improves desilting efficiency.
Preferably, in the dredging machine tool under the wharf, the tail end of the telescopic rod is provided with a universal joint and is connected with the motor through the universal joint, so that dredging work with different depths and different directions can be performed.
Preferably, in the silt remover under the wharf, the tail end of the water pipe is provided with a nozzle, and high-pressure water flows through the nozzle to be sprayed out, so that the efficiency is improved.
Preferably, the bottom dredging machine of wharf still include the setting and be in the slush pump on the brace table, be connected with a mud conveying pipeline and a storage mud case on the slush pump, the entry position of mud conveying pipeline is in one side of desilting part, the slush pump passes through mud conveying pipeline pump into to storing up the mud case with silt, and mud conveying pipeline's entry position is in desilting part one side, can in time inhale the silt of breaing up, the through-flow hole has been seted up on the lateral wall upper portion of storage mud case, can flow out with the surplus water in the storage mud case like this, and then deposit more silt.
Preferably, in the wharf bottom dredging machine, two stirring fins are arranged at 180 degrees to form a stirring vortex.
The invention also provides a method for dredging under the wharf, which comprises the following steps:
the method comprises the steps of obtaining the height of sludge at a position to be desilted, calculating the volume of the sludge to be removed according to the height of the sludge, moving a support table to the position to be desilted through the matching of a slide rail and a slide groove, fixing the support table, wherein the slide groove is arranged at the edge of the ground of a wharf and extends along the edge of the ground of the wharf, the lower surface of the support table is provided with the slide rail matched with the slide groove, the support table is provided with a connecting part protruding out of the edge of the ground of the wharf, and the connecting part;
opening a hydraulic cylinder which is arranged on the connecting part and has an output end connected to the telescopic rod, wherein the tail end of the telescopic rod is provided with a motor, and the output end of the motor is provided with a dredging component which is driven by the telescopic rod to descend to the height of the sludge, the hydraulic cylinder is closed, the dredging component stops descending, the dredging component comprises a rod part and at least two stirring fins arranged at the head end of the rod part, each stirring fin comprises a right-angled trapezoid part positioned at the upper part and a rectangular part positioned at the lower part, the length of the top edge of the right trapezoid part is greater than that of the bottom edge, the length of the bottom edge is equal to that of the rectangular part, a plurality of stirring convex strips which are mutually spaced and arranged in parallel are arranged on two side walls of each stirring fin, and the stirring convex strips on the two side walls are arranged in a mirror image manner;
turning on a motor, starting a stirring fin on the dredging component to rotate, simultaneously starting a high-pressure water pump which is arranged on the connecting part and is connected to the dredging component through a water pipe, spraying water flow through the water pipe and a nozzle arranged at the tail end of the water pipe, starting a slurry pump arranged on the supporting table after a preset lag time, and allowing sludge to enter a sludge storage tank through a sludge conveying pipeline;
when the sludge in the sludge storage tank reaches the volume of the sludge to be removed, the motor, the high-pressure water pump and the sludge pump are turned off;
opening the hydraulic cylinder, driving the dredging component to the original height, and closing the hydraulic cylinder;
moving the support table to the next position to be desilted and fixing;
and repeating the steps until the end.
Preferably, the dredging method further comprises:
presetting the height of the silt after dredging;
when the difference between the height of the sludge at the position to be desilted and the height of the sludge after desilting is 30cm-50cm, the hydraulic cylinder is started once at an interval of 1.5min, and the telescopic rod is driven to move downwards by 10 cm;
when the difference between the height of the sludge at the position to be desilted and the height of the sludge after desilting is 50cm-90cm, the hydraulic cylinder is started once at an interval of 1min, and the telescopic rod is driven to move downwards for 4-7 cm;
when the difference between the height of the sludge at the position to be desilted and the height of the sludge after desilting exceeds 90cm, the hydraulic cylinder is opened once at an interval of 0.5min, and the telescopic rod is driven to move downwards by 2-5 cm.
Different working parameters are set according to different sludge heights, and working efficiency can be guaranteed when more sludge is removed.
The invention provides a wharf bottom dredging machine and a dredging method thereof, wherein dredging is realized by utilizing a sliding chute, a supporting table, a hydraulic cylinder, a motor, a dredging part and a high-pressure water pump, machinery is completely adopted, manpower only plays the roles of assistance and observation, the dredging efficiency is high, the potential safety hazard is small, and the quality is high.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an under-dock silt remover according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1, the present invention provides a wharf bottom dredging machine, which comprises:
a chute 1 provided at the edge of the dock floor 2 and extending along the edge of the dock floor 2;
the lower surface of the support table 3 is provided with a slide rail matched with the chute 1, the support table 3 is provided with a connecting part 4 protruding out of the edge of the wharf ground 2, and the connecting part 4 is provided with a through hole for a telescopic rod 5 to pass through;
the hydraulic cylinder 6 is arranged on the connecting part 4, and the output end of the hydraulic cylinder 4 is connected to the telescopic rod 5;
the motor 10 is arranged at the tail end of the telescopic rod 5, and the motor 10 is provided with a waterproof shell;
the dredging component 11 is connected to the output end of the motor 10, the dredging component 11 comprises a rod part and at least two stirring fins arranged at the head end of the rod part, each stirring fin comprises a right-angled trapezoidal part positioned above and a rectangular part positioned below, the length of the top edge of the right-angled trapezoidal part is greater than that of the bottom edge, the length of the bottom edge is equal to that of the rectangular part, a plurality of stirring convex strips which are mutually spaced and arranged in parallel are arranged on two side walls of each stirring fin, and the stirring convex strips on the two side walls are arranged in a mirror image manner;
and the high-pressure water pump 7 is arranged on the connecting part 4, and the high-pressure water pump 7 is connected to the dredging component 11 through a water pipe 8.
In the dredging machine under the wharf, the tail end of the telescopic rod 5 is provided with a universal joint 9 and is connected with the motor 10 through the universal joint 9.
In the silt remover under the wharf, the tail end of the water pipe 8 is provided with a nozzle.
The dredging machine tool under the wharf further comprises a mud pump 12 arranged on the support table 3, the mud pump 12 is connected with a mud conveying pipeline and a mud storage box, the inlet section of the mud conveying pipeline is located on one side of the dredging component, and a water flow through hole is formed in the upper portion of the side wall of the mud storage box.
In the silt remover under the wharf, the two stirring fins are arranged at an angle of 180 degrees.
Selecting a wharf, wherein the distance a between the surface of the sludge below the wharf and the bottom surface of the wharf is 80-160 cm, the preset distance b is 50cm, and three positions with a being 88cm, 115cm and 153cm are respectively selected as positions to be desilted for carrying out desilting work.
Example 1 a sludge height c of 88cm at the position to be desilted, a, which is the difference between a and b, i.e. 38cm, was obtained, and from this sludge height the volume v of sludge to be removed was calculated, v being equal to the product of the working area s of the dredging member and c, s being 1m2When v is 0.38m3The supporting platform is moved to the position to be desilted through the matching of the sliding rail and the sliding groove and is fixed;
starting the hydraulic cylinder, driving the dredging component to descend by 88cm by the telescopic rod, closing the hydraulic cylinder, and stopping descending the dredging component;
turning on a motor, starting a stirring fin to rotate, simultaneously starting a high-pressure water pump, spraying water flow out through a water pipe and a nozzle, starting a slurry pump after a preset lag time, and allowing sludge to enter a sludge storage tank through a sludge conveying pipeline;
the hydraulic cylinder is started once at an interval of 1.5min, and the telescopic rod is driven to move downwards by 10 cm;
when the sludge in the sludge storage tank reaches the volume of the sludge to be removed, the motor, the high-pressure water pump and the sludge pump are turned off;
the hydraulic cylinder is opened, the dredging part is driven to the original height, and the hydraulic cylinder is closed.
Example two
Acquiring the height c of the sludge at the position to be desilted, namely a 115cm, which is the difference between a and b, namely 65cm, and calculating the volume v of the sludge to be removed according to the height of the sludge, wherein the v is equal to the product of the working area s and c of a desilting component, and the s is 1m2Then v is 0.65m3The supporting platform is moved to the position to be desilted through the matching of the sliding rail and the sliding groove and is fixed;
starting the hydraulic cylinder, driving the dredging component to descend by 115cm by the telescopic rod, closing the hydraulic cylinder, and stopping the dredging component from descending;
turning on a motor, starting a stirring fin to rotate, simultaneously starting a high-pressure water pump, spraying water flow out through a water pipe and a nozzle, starting a slurry pump after a preset lag time, and allowing sludge to enter a sludge storage tank through a sludge conveying pipeline;
the hydraulic cylinder is started once at an interval of 1min, and the telescopic rod is driven to move downwards by 5 cm;
when the sludge in the sludge storage tank reaches the volume of the sludge to be removed, the motor, the high-pressure water pump and the sludge pump are turned off;
the hydraulic cylinder is opened, the dredging part is driven to the original height, and the hydraulic cylinder is closed.
EXAMPLE III
Obtaining the position to be desilted, namely aA sludge height c of 153cm, which is the difference between a and b, i.e. 103cm, and from which the volume v of the sludge to be removed is calculated, v being equal to the product of the working area s of the dredging parts and c, s being 1m2Then v is 1.03m3The supporting platform is moved to the position to be desilted through the matching of the sliding rail and the sliding groove and is fixed;
starting the hydraulic cylinder, driving the dredging component to descend by 153cm by the telescopic rod, closing the hydraulic cylinder, and stopping the dredging component from descending;
turning on a motor, starting a stirring fin to rotate, simultaneously starting a high-pressure water pump, spraying water flow out through a water pipe and a nozzle, starting a slurry pump after a preset lag time, and allowing sludge to enter a sludge storage tank through a sludge conveying pipeline;
the hydraulic cylinder is started once at an interval of 0.5min, and the telescopic rod is driven to move downwards by 3 cm;
when the sludge in the sludge storage tank reaches the volume of the sludge to be removed, the motor, the high-pressure water pump and the sludge pump are turned off;
the hydraulic cylinder is opened, the dredging part is driven to the original height, and the hydraulic cylinder is closed.
Comparative example
The conventional wharf bottom dredging machine is adopted to dredge the position with the same sludge height of the same wharf, and the dredging result compared with the embodiment of the invention is shown in the table 1:
TABLE 1
Figure BDA0001470891330000061
As can be clearly seen from the table 1, the dredging machine under the wharf provided by the invention is used for dredging, the dredging time is short, the efficiency is high, the quality is good, and the surface of the sludge is flat.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (7)

1. Basement silt remover, its characterized in that includes:
a chute disposed at and extending along a dock floor edge;
the lower surface of the support table is provided with a slide rail matched with the slide groove, the support table is provided with a connecting part protruding out of the edge of the wharf ground, and the connecting part is provided with a through hole for the telescopic rod to pass through;
the hydraulic cylinder is arranged on the connecting part, and the output end of the hydraulic cylinder is connected to the telescopic rod;
the motor is arranged at the tail end of the telescopic rod and is provided with a waterproof shell;
the dredging component is connected to the output end of the motor and comprises a rod part and at least two stirring fins arranged at the head end of the rod part, each stirring fin comprises a right-angle trapezoidal part positioned above and a rectangular part positioned below, wherein the length of the top edge of the right-angle trapezoidal part is greater than that of the bottom edge, the length of the bottom edge is equal to that of the rectangular part, a plurality of stirring convex strips which are mutually spaced and arranged in parallel are arranged on two side walls of each stirring fin, and the stirring convex strips on the two side walls are arranged in a mirror image manner;
and the high-pressure water pump is arranged on the connecting part and is connected to the dredging component through a water pipe.
2. The dockside silt remover of claim 1, wherein said telescoping rod is provided with a universal joint at its distal end and is connected to said motor via said universal joint.
3. The dockside silt remover of claim 1, wherein the end of said water pipe is provided with a nozzle.
4. The dockside dredging machine as claimed in claim 1, further comprising a mud pump disposed on the support platform, wherein a mud pipe and a mud storage tank are connected to the mud pump, an inlet section of the mud pipe is located at one side of the dredging component, and a water flow hole is formed in an upper portion of a side wall of the mud storage tank.
5. The dockside silt remover of claim 1, wherein two of said agitating fins are disposed at 180 °.
6. The method of dredging using the wharf bottom dredging machine as claimed in any one of claims 1 to 5, comprising the steps of:
the method comprises the steps of obtaining the height of sludge at a position to be desilted, calculating the volume of the sludge to be removed according to the height of the sludge, moving a support table to the position to be desilted through the matching of a slide rail and a slide groove, fixing the support table, wherein the slide groove is arranged at the edge of the ground of a wharf and extends along the edge of the ground of the wharf, the lower surface of the support table is provided with the slide rail matched with the slide groove, the support table is provided with a connecting part protruding out of the edge of the ground of the wharf, and the connecting part;
opening a hydraulic cylinder which is arranged on the connecting part and has an output end connected to the telescopic rod, wherein the tail end of the telescopic rod is provided with a motor, and the output end of the motor is provided with a dredging component which is driven by the telescopic rod to descend to the height of the sludge, the hydraulic cylinder is closed, the dredging component stops descending, the dredging component comprises a rod part and at least two stirring fins arranged at the head end of the rod part, each stirring fin comprises a right-angled trapezoid part positioned at the upper part and a rectangular part positioned at the lower part, the length of the top edge of the right trapezoid part is greater than that of the bottom edge, the length of the bottom edge is equal to that of the rectangular part, a plurality of stirring convex strips which are mutually spaced and arranged in parallel are arranged on two side walls of each stirring fin, and the stirring convex strips on the two side walls are arranged in a mirror image manner;
turning on a motor, starting a stirring fin on the dredging component to rotate, simultaneously starting a high-pressure water pump which is arranged on the connecting part and is connected to the dredging component through a water pipe, spraying water through the water pipe and a nozzle arranged at the tail end of the water pipe, starting a slurry pump arranged on the supporting table after a preset lag time, and enabling sludge to enter a sludge storage tank through a sludge conveying pipeline;
when the sludge in the sludge storage tank reaches the volume of the sludge to be removed, the motor, the high-pressure water pump and the sludge pump are turned off;
opening the hydraulic cylinder, driving the dredging component to the original height, and closing the hydraulic cylinder;
moving the support table to the next position to be desilted and fixing;
and repeating the steps until the end.
7. The method of dredging as claimed in claim 6, further comprising:
presetting the height of the silt after dredging;
when the difference between the height of the sludge at the position to be desilted and the height of the sludge after desilting is 30cm-50cm, the hydraulic cylinder is started once at an interval of 1.5min, and the telescopic rod is driven to move downwards by 10 cm;
when the difference between the height of the sludge at the position to be desilted and the height of the sludge after desilting is 50cm-90cm, the hydraulic cylinder is started once at an interval of 1min, and the telescopic rod is driven to move downwards for 4-7 cm;
when the difference between the height of the sludge at the position to be desilted and the height of the sludge after desilting exceeds 90cm, the hydraulic cylinder is opened once at an interval of 0.5min, and the telescopic rod is driven to move downwards by 2-5 cm.
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