CN220414351U - Engineering ship suitable for alkaline residue mining - Google Patents

Abstract

The utility model relates to an engineering ship suitable for alkaline residue mining, which relates to the technical field of machinery, and comprises the following components: a hull; the rear end of the cutter arm is connected with the ship body; the cutter head rotating device is arranged at the front end of the cutter arm; one end of the cutter arm driving device is symmetrically fixed on the ship body, and the other end of the cutter arm driving device is connected with the cutter arm; the cutter arm lifting mechanism is fixed on the ship body; the sucking device is arranged behind the cutter head rotating device; the tool bit scouring device is symmetrically fixed on the tool arm; and the power distribution control device is connected with the tool bit rotating device, the tool arm driving device, the tool arm lifting mechanism and the material sucking device. The cutter head is wrapped in the process of large-area mining of the alkaline residue by the traditional cutter suction dredger, so that the problem that the mining efficiency is affected due to the fact that the cutter head is wrapped in the process of large-area mining of the alkaline residue is solved, and continuous construction is achieved; meanwhile, the requirement of excavating alkaline residues with different regional properties can be met under the condition that the power of the slurry pump is certain, equipment is not required to be replaced, and the device has the characteristics of low cost and convenience in installation and use.

Description

Engineering ship suitable for alkaline residue mining

Technical Field

The utility model relates to the technical field of machinery, in particular to an engineering ship suitable for alkaline residue mining.

Background

The alkaline residue is used as a derivative in the alkaline preparation process, cannot be well treated, and can form an alkaline residue pool with wide occupied area after being accumulated for many years. The existence of the method not only occupies precious land resources and affects urban image, but also has adverse effects on surrounding environment. Along with the breakthrough of the caustic sludge treatment technology, the caustic sludge treatment engineering is increasingly receiving attention from all parties.

When the cutter suction type sewage disposal ship works, substances deposited at the bottom are required to be stirred, and then the turbid solid-liquid mixture is pumped out by a slurry pump and discharged to a designated position, so that the cutter suction type sewage disposal ship plays an important role in dredging or cleaning sludge at the bottom of places such as lakes, rivers and reservoirs.

The cutter suction type dredger is used for dredging the alkaline residue, which is feasible in principle, but the application of the large-area alkaline residue treatment engineering is less at present, and related reference materials are lacked.

In view of the above circumstances, a conventional cutter suction dredger is adopted in a certain alkaline residue treatment project to carry out a dredging test on alkaline residues, and according to test results, the following results are found: because the alkali slag has the characteristic, not only contains substances such as calcium carbonate, magnesium, aluminum, silicon and the like, but also contains sol substances, and has certain viscosity, so that the reamer is often wrapped by the alkali slag during operation, the slag discharge amount is greatly influenced, the cutter suction efficiency is lower, and the requirement of large-area long-term alkali slag mining and treatment cannot be met.

(1) The patent with publication number of CN217870633U discloses a river dredging engineering ship, which comprises a ship body, a cutter suction device and the like, and can realize concentrated dredging, mud suction and slag discharge, but can not solve the problem of wrapping a cutter head by viscous alkali slag;

(2) The patent with the publication number of CN212271048 discloses a self-propelled multifunctional construction ship with supporting legs, which comprises a ship body, a functional room, an operation room and the like, and can perform backhoe dredging, cutter suction dredging and piling operation, and has multiple functions, but still can not meet the problem of improving the alkaline residue dredging efficiency;

(3) The patent with the publication number of CN209493984U discloses a cutter suction ship capable of detecting dredging depth, which comprises a ship body, a cutter suction head, a transmission mechanism and the like, and can rapidly detect whether the dredging depth reaches the standard in real time, so that dredging efficiency is improved, but a dirt suction port is still blocked by viscous alkaline residue substances, and the efficiency is low.

Disclosure of Invention

Therefore, in view of the situations of the three patents, the utility model provides an engineering ship suitable for excavating alkaline residue, and related devices are arranged on the basis of traditional cutter suction, so that the problem of low cutter suction efficiency caused by the fact that viscous alkaline residue wraps a cutter suction head is effectively solved, and continuous construction is carried out; and the suction force can be regulated aiming at alkaline residues with different viscosities, the cutter head form is not required to be regulated, the operation is simple and quick, and the slag taking requirement of a large-area alkaline residue treatment project is met.

The utility model aims to provide an engineering ship suitable for alkaline residue mining, which effectively solves the problem that a common cutter suction ship is easy to cause lower cutter head wrapping efficiency aiming at viscous alkaline residue substances, is suitable for alkaline residue treatment of different areas and different properties, and has high construction efficiency, economy and practicability; the cutter head is suitable for the excavating work of various viscous alkaline residue substances, the cutter head can be effectively prevented from being wrapped and replaced, and the excavating efficiency is greatly improved; meanwhile, the device can properly adjust the concentration of the slag slurry, and is convenient for subsequent process treatment.

In order to achieve the above object, the technical scheme of the present utility model provides an engineering ship suitable for alkaline residue mining, comprising:

a hull;

the rear end of the cutter arm is connected with the ship body;

the tool bit rotating device is arranged at the front end of the tool arm;

one end of the cutter arm driving device is symmetrically fixed on the hull, and the other end of the cutter arm driving device is connected with the cutter arm and controls the cutter arm to move forwards and backwards relative to the hull;

the cutter arm lifting mechanism is fixed on the ship body and controls the cutter arm to move along the circumference;

the suction device is arranged behind the cutter head rotating device and is used for sucking slag slurry;

the tool bit flushing device is symmetrically fixed on the tool arm;

and the power distribution control device is connected with the tool bit rotating device, the tool arm driving device, the tool arm lifting mechanism and the material sucking device.

Preferably, the tool bit rotating device comprises a tool bit, a rotating wheel and a rotating motor, wherein the rotating wheel is fixed on the tool arm and is connected with the tool bit to drive the tool bit to rotate; the rotating motor controls the rotating direction and the angle of the cutter head.

Preferably, the cutter arm driving device comprises a pair of rails symmetrically arranged on two inner walls of the ship body, two rotatable wheel assemblies are arranged in the rails and are connected with the cutter arm, the rotatable wheel assemblies are connected with a bidirectional driving motor and drive the cutter arm to move along the advancing direction of the ship body, and a limiting baffle is arranged to control the moving range.

Preferably, the cutter arm lifting mechanism comprises a lifting frame arranged on the ship body, a fixed pulley block arranged in the lifting frame, a winch arranged on the ship body, and a lifting lug arranged on the winch and the cutter arm, wherein a steel strand of the winch bypasses the fixed pulley block and is hung on the lifting lug.

Preferably, the material sucking device comprises a cylindrical feeding hole arranged behind the cutter head, and the cylindrical feeding hole is connected with the slurry pump through a feeding hose; the cylindrical feed inlet and the movable device fixed on the cutter arm move in a small range.

Preferably, the tool bit flushing device comprises high-pressure spray heads symmetrically arranged on two sides of the tool arm, the high-pressure spray heads are fixed at a certain distance behind the tool bit through clamping pieces and are connected with a variable-frequency clean water pump through a high-pressure hose, and the clean water pump absorbs water through the hose.

Preferably, the power distribution control device is arranged at the fixed position of the ship body and is used as a power supply and control center of the cutter arm driving device, the cutter arm lifting mechanism, the material sucking device and the cutter head flushing device.

Preferably, the device further comprises a measuring device which is arranged at the tail end of the material sucking device and is used for measuring the flow and the concentration of the sucked slurry.

In summary, the utility model has the following beneficial technical effects:

(1) The cutter head flushing device is adopted, so that the problem of cutter head wrapping caused by the fact that the viscosity of alkaline residue is high in a traditional cutter suction device can be effectively solved, and the alkaline residue mining efficiency is improved;

(2) The utility model adopts the slag slurry suction device with adjustable suction distance, can adjust the suction force of the suction port, and solves the problem of wrapping the cutter head caused by the viscosity of alkaline slag; meanwhile, the suction concentration of the slag slurry can be effectively regulated by regulating the suction force, so that the subsequent process requirements are met;

(3) The cutter arm driving device is adopted, so that the excavating mode of the positioning pile adopted by the traditional cutter suction dredger is effectively solved, and the construction mode is more convenient;

(4) The tool bit conversion device adopted by the utility model can adjust the tool bit in operation, thereby greatly improving the excavating efficiency;

(5) The utility model adopts the tool bit scouring device, the slag slurry suction device and the tool bit conversion device in combination, can be matched with any tool bit type, and has strong adaptability;

(6) The utility model adopts the power distribution control device to detect the flow and the concentration of the slurry, monitors in real time, adjusts the strength of the suction and flushing device in real time according to the monitoring condition, and is convenient for improving the excavating efficiency;

(7) The device can be detached, is convenient to move and is convenient to implement.

Drawings

FIG. 1 is a schematic illustration of an engineering vessel suitable for caustic sludge mining in accordance with the present utility model;

FIG. 2 is a schematic view of a tool bit rotating device of an engineering ship suitable for alkaline residue mining;

FIG. 3 is a schematic view of a cutter arm driving device of an engineering ship suitable for caustic sludge mining;

FIG. 4 is a schematic view of a cutter arm lifting mechanism of an engineering vessel suitable for caustic sludge mining in accordance with the present utility model;

fig. 5 is a schematic diagram of a suction and cutter head flushing device of an engineering ship suitable for alkaline residue mining.

Reference numerals: 1. a hull; 2. a cutter arm; 3. a cutter head rotating device; 31. a cutter head; 32. a rotating wheel; 33. a rotating electric machine; 4. a cutter arm driving device; 41. a track; 42. a runner assembly; 43. a bi-directional drive motor; 44. a limit baffle; 5. a cutter arm lifting mechanism; 51. a lifting frame; 52. a fixed pulley block; 53. a hoist; 531. steel strand; 54. lifting lugs; 6. a material sucking device; 61. a cylindrical feed port; 62. a feed hose; 63. a slurry pump; 64. a movable device; 7. a bit flushing device; 71. a high pressure nozzle; 72. a clean water pump; 8. a power distribution control device; 9. a measuring device.

Detailed Description

The technical scheme of the utility model is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The embodiment of the utility model discloses an engineering ship suitable for alkaline residue mining, which comprises:

a hull 1, a cutter arm 2 and a power distribution control device 8 which are arranged on the hull 1;

the front end of the cutter arm 2 is fixed with a cutter head 31, and the rear end of the cutter arm is connected with the cutter arm driving device 4;

the tool bit rotating device 3 is fixed at the front end of the tool arm 2, and the tool bit rotating device 3 controls the tool bit 31 to rotate;

the cutter arm driving device 4, one end of the cutter arm driving device 4 is symmetrically fixed on the hull 1, and the other end is connected with the cutter arm 2 to control the cutter arm to move back and forth relative to the hull 1;

the cutter arm lifting mechanism 5 is fixedly arranged on the ship body 1 and controls the cutter arm 2 to move along the circumference;

the material sucking device 6 is arranged behind the cutter head rotating device 3 and is responsible for sucking the slurry;

the cutter head flushing device 7 is symmetrically fixed on the cutter arm 2 and is arranged behind the cutter head 31 and used for flushing alkaline residues wrapped by the cutter head 31;

the power distribution control device 8 is arranged on the ship body 1, and the power distribution control device 8 is connected with the cutter head rotating device 3, the cutter arm driving device 4, the cutter arm lifting mechanism 5 and the material sucking device 6 and is used for power supply and control of various devices.

And the measuring device 9 is arranged at the rear end of the suction device 6 and is used for monitoring flow, concentration and other data of the slurry in real time.

The tool bit rotating device 3 comprises a tool bit 31, a rotating wheel 32 and a rotating motor 33, wherein the rotating wheel 32 is fixed at the front end of the tool arm 2 and is connected with the tool bit 31 with a fixed angle to control the tool bit 31 to rotate; the rotary motor 33 controls the rotation direction and angle of the cutter head 31.

The cutter arm driving device 4 comprises a pair of rails 41 symmetrically arranged on two inner walls of the ship body 1, a sliding runner assembly 42 is arranged in the two rails 41, the runner assembly 42 is connected with the cutter arm 2, the runner assembly 42 is connected with a bidirectional driving motor 43, the cutter arm 2 is driven to move along the advancing direction of the ship body 1, and a limit baffle 44 is arranged to control the moving range.

The arm lifting mechanism 5 comprises a lifting frame 51 arranged on the ship body 1, a fixed pulley block 52 arranged in the lifting frame 51, a winch 53 arranged on the ship body 1, and lifting lugs 54 arranged on the winch 53 and the arm 2, wherein steel strands 531 of the winch 53 bypass the fixed pulley block 52 and are hung on the lifting lugs 54.

The suction device 6 is fixed on the cutter wall and comprises a cylindrical feeding hole 61 arranged behind the cutter head 31, and the cylindrical feeding hole 61 is connected with a slurry pump 63 through a feeding hose 62 (or galvanized steel pipe); the cylindrical feed port 61 is moved to a small extent by a movable means 64 fixed to the cutter arm 2.

The tool bit flushing device 7 comprises high-pressure spray heads 71 symmetrically arranged on two sides of the tool arm 2, wherein the high-pressure spray heads 71 are fixed on the tool arm 2 (a certain distance behind the tool bit 31) through clamping pieces (clamping rings), and are connected with a variable-frequency clean water pump 72 through a high-pressure hose, and the clean water pump 72 absorbs water through the hose.

The power distribution control device 8 is arranged at a fixed position of the ship body 1 and is used as a power supply and control center of the cutter arm driving device 4, the cutter arm lifting mechanism 5, the material sucking device 6 and the cutter head flushing device 7. The power distribution control device 8 comprises a power distribution cabinet, a control cabinet and related cables, and the equipment is arranged in a fixed space in the ship body 1 and is connected with all the power utilization devices through the cables;

the device also comprises a measuring device 9 which is arranged at the tail end of the suction device 6 and is used for measuring the flow and the concentration of the sucked slurry. The measuring device 9 comprises measuring instruments such as a flowmeter, a concentration meter and the like, and various instruments are arranged at the rear end of the material sucking device 6 and used for feeding back various data as input of a control system.

When large-area alkaline residue excavating operation is carried out, a cutter suction dredger is usually adopted for construction. In order to ensure the alkaline residue mining efficiency, avoid the problem of wrapping of the cutter head 31 caused by the influence of viscous alkaline residue, ensure continuous construction, and provide an engineering ship suitable for alkaline residue mining as shown in fig. 1-5. The engineering ship for excavating alkaline residue comprises a ship body 1, a cutter arm 2, a cutter head rotating device 3, a cutter arm driving device 4, a cutter arm lifting mechanism 5, a material sucking device 6, a cutter head flushing device 7, a power distribution control device 8 and a measuring device 9.

The cutter arm driving device 4 is fixed on the ship body 1 and can drive the cutter arm 2 to move forwards and backwards, and the front end of the cutter arm 2 is connected with the cutter head rotating device 3; the cutter arm lifting mechanism 5 can drive the cutter arm 2 to run along the circumference; the suction device 6 is responsible for sucking the slag slurry generated after the cutter head rotating device 3 is twisted and sucked; the cutter head flushing device 7 is arranged behind the cutter head rotating device 3 and is responsible for removing alkali residues wrapped on the cutter head rotating device 3; the power distribution control device 8 is arranged on the ship body 1 and is responsible for power supply and control of all devices; the measuring device 9 is arranged at the rear end of the suction device 6 and provides measurement data.

Further, rails 41 are symmetrically arranged on two sides of the ship body 1, the rails 41 are connected with a rotating wheel assembly 42, and the cutter arm 2 is connected to the rotating wheel assembly 42 and driven by a bidirectional driving motor 43 to move the cutter arm 2 back and forth along the advancing direction of the ship body 1; the track 41 is provided with a limit baffle 44 for controlling the travel of the runner assembly 42; the length of the track 41 and the installation position of the limit baffle 44 can be adjusted according to the actual digging requirement, so as to meet the construction requirement, and the length of the track 41 is preferably not less than 3/4 of the length of the carrier;

further, a lifting frame 51 is installed on the hull 1, a fixed pulley block 52 is installed on the lifting frame 51, a winch 53 arranged on the hull 1 controls the cutter arm 2 to run along the circumferential direction, and a steel strand 531 is connected with the device; for easy disassembly, the fixing mode of the equipment arranged on the ship body 1 can be bolt connection or welding, so that the equipment is not limited too much, and the construction requirement can be met; the digging depth which can be achieved by the cutter arm lifting mechanism 5 is influenced by the length of the cutter arm 2, and the digging depth can be adjusted according to the actual condition of the site;

further, the front end of the cutter arm 2 is provided with a rotary wheel 32, the rotary wheel 32 is fixed with the cutter heads 31, preferably 3 cutter heads 31 are arranged, the distance between each cutter head 31 is 120 degrees, the rotary wheel 32 and the cutter heads 31 can be connected in a mode of being convenient to detach, such as bolting, clamping and the like, and the number of the cutter heads 31 can be confirmed by the actual situation on site; meanwhile, the rotating motor 33 controls the rotating direction and the angle of the cutter head 31 mechanism, and the motor adopts a variable frequency motor, so that the cutter head 31 is convenient to be twisted and sucked stably in the switching process;

further, the cylindrical feeding hole 61 is arranged behind the cutter head 31, the distance between the cylindrical feeding hole and the cutter head 31 can be adjusted by a movable device 64 arranged on the cutter arm 2, and the suction strength at the cutter head 31 can be changed by adjusting the distance, so that the feeding amount can be changed; meanwhile, the change of the suction strength can help solve the problem that the cutter head 31 is wrapped by the viscous caustic sludge, so that the excavating efficiency is improved; the sucked slurry is conveyed to a slurry pump 63 through a feed hose 62, the feed hose 62 can be made of PVC material, and the slurry pump 63 can select different pump sets according to the corrosion degree of the slurry;

further, the high-pressure spray head 71 is arranged behind the cutter head 31 and is fixed on the cutter arm 2 through a buckle, the arrangement is symmetrical, the number can be adjusted according to the construction condition, and 4 is preferably arranged; after the clean water pump 72 absorbs water, water is supplied to the high-pressure spray head 71 through a high-pressure hose, and the water supply pressure can be adjusted according to the viscosity of alkaline residues;

further, the power distribution control device 8 is arranged in a fixed space in the ship body 1, supplies power to all electric equipment, receives various electric signals from the measuring device 9, processes the electric signals in real time, sends out control signals, and controls the running states of various devices; the power distribution cabinet, the control cabinet and the related cables which are provided by the power supply control device are all standard equipment, so that the power supply control device is not excessively limited and meets basic requirements;

further, the measuring device 9 should include a flowmeter, a concentration meter, and other measuring instruments capable of reflecting the property of the extracted slurry, and the collected signals should be fed back to the power distribution control device 8 through a signal line to monitor the extraction condition in real time.

The implementation process of the caustic sludge excavating cutter suction device comprises the following steps:

(1) The ship body 1 runs to a proper mining position;

(2) The cutter arm driving device 4 adjusts the position of the cutter arm 2;

(3) The cutter arm lifting mechanism 5 adjusts the cutter arm 2 to a proper underwater excavation position;

(4) The cutter head rotating device 3 starts cutter suction;

(5) The sucking device 6 and the cutter head flushing device 7 operate;

(6) The power distribution control device 8 receives signals from the measuring device 9 and controls various mechanisms;

(7) The digging of the area is completed, the digging area is redetermined, and the processes (2) - (6) are executed;

(8) After the construction is completed, the corresponding equipment is removed.

The cutter suction tool bit 31 is wrapped in the process of excavating large-area alkaline residues, and the problem of low excavating efficiency caused by the fact that the viscous alkaline residues are wrapped in the cutter suction tool bit is solved; meanwhile, all the equipment of the utility model can be disassembled, is simple and convenient to install and is convenient to implement.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (8)

1. An engineering vessel suitable for caustic sludge mining, comprising:

a hull (1);

the rear end of the cutter arm (2) is connected with the ship body (1);

the tool bit rotating device (3), the tool bit rotating device (3) is arranged at the front end of the tool arm (2);

the cutter arm driving device (4), one end of the cutter arm driving device (4) is symmetrically fixed on the ship body (1), and the other end of the cutter arm driving device is connected with the cutter arm (2) to control the cutter arm to move forwards and backwards relative to the ship body (1);

the cutter arm lifting mechanism (5), the cutter arm lifting mechanism (5) is fixed on the ship body (1) and controls the cutter arm (2) to move along the circumference;

the suction device (6) is arranged behind the cutter head rotating device (3) and is used for sucking slag slurry;

the tool bit flushing device (7), the tool bit flushing device (7) is symmetrically fixed on the tool arm (2);

the power distribution control device (8), the power distribution control device (8) is connected with the tool bit rotating device (3), the tool arm driving device (4), the tool arm lifting mechanism (5) and the material sucking device (6).

2. Engineering vessel suitable for alkaline residue mining according to claim 1, characterized in that the tool bit rotating device (3) comprises a tool bit (31), a rotating wheel (32) and a rotating motor (33), wherein the rotating wheel (32) is fixed on the tool arm (2), and the rotating wheel (32) is connected with the tool bit (31) to drive the tool bit (31) to rotate; the rotating motor (33) controls the rotation direction and angle of the cutter head (31).

3. An engineering ship suitable for alkaline residue mining according to claim 1, wherein the cutter arm driving device (4) comprises a pair of rails (41) symmetrically arranged on two inner walls of the ship body (1), two sliding runner assemblies (42) are arranged in the rails (41), the runner assemblies (42) are connected with the cutter arms (2), the runner assemblies (42) are connected with a bidirectional driving motor (43) to drive the cutter arms (2) to move along the advancing direction of the ship body (1), and limit baffles (44) are arranged to control the moving range.

4. An engineering vessel suitable for alkaline residue mining according to claim 1, characterized in that the cutter arm lifting mechanism (5) comprises a lifting frame (51) arranged in the hull (1), a fixed pulley block (52) arranged in the lifting frame (51), a winch (53) arranged on the hull (1), and lifting lugs (54) arranged on the winch (53) and the cutter arm (2), wherein steel strands (531) of the winch (53) are hung on the lifting lugs (54) by bypassing the fixed pulley block (52).

5. Engineering vessel suitable for alkaline residue mining according to claim 1, characterized in that the suction device (6) comprises a cylindrical feed opening (61) arranged behind the cutter head (31), the cylindrical feed opening (61) being connected to a slurry pump (63) by means of a feed hose (62); the cylindrical feed opening (61) and the movable device (64) fixed on the cutter arm (2) move in a small range.

6. Engineering vessel suitable for alkaline residue mining according to claim 1, characterized in that the tool bit flushing device (7) comprises high-pressure spray heads (71) symmetrically arranged on two sides of the tool arm (2), wherein the high-pressure spray heads (71) are fixed at a certain distance behind the tool bit (31) through clamping pieces, are connected with a variable-frequency clean water pump (72) through a high-pressure hose, and the clean water pump (72) absorbs water through the hose.

7. Engineering vessel suitable for alkaline residue mining according to claim 1, characterized in that the power distribution control device (8) is arranged at a fixed position of the hull (1) as a power supply and control hub for the cutter arm driving device (4), the cutter arm lifting mechanism (5), the suction device (6) and the cutter head flushing device (7).

8. Engineering vessel suitable for alkaline residue mining according to claim 1, characterized in that it further comprises measuring means (9) arranged at the end of the suction means (6) for measuring the flow and concentration of the sucked up slurry.