JP2018040187A - Dredging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that prevents swirling of mud polluted by radioactive cesium when a dredging device moves, so as to overcome a problem with the dredging device that the mud polluted by radioactive cesium swirls up as the device scoops polluted mud at a water bottom while moving.SOLUTION: A dredging device is for removing a prescribed thickness of mud and sand at a bottom of a pond and other water bodies by sequentially sucking the mud and sand at the water bottom while moving a dredging intake port structure forward, and includes a resistance detection part for detecting resistance, and a forward moving speed setting part for controlling a motor so as to change a forward moving speed according to a degree of the resistance.SELECTED DRAWING: Figure 5

Description

The present invention relates to a dredging device for taking in mud in a dredger that scoops up mud deposited on the bottom of a lake or pond.

Countermeasures against soil contamination by radioactive cesium diffused in the Fukushima Daiichi Nuclear Power Plant accident in March 2011 are urgently needed. In particular, radioactive cesium-adsorbed soil flows into the water area due to rainfall and accumulates on the bottom of closed water areas such as lakes and ponds, resulting in a high concentration of radioactive cesium. When such a closed water area is an agricultural pond, the cultivated land is recontaminated, and when it is a fishing ground, the marine product is contaminated, and an immediate countermeasure is desired.

And it is known that the mud contamination at the bottom of the water is high in the surface layer and low in the deep part. Therefore, a considerable amount of contaminated mud can be removed by scooping up muddy soil having a depth of several centimeters to several tens of centimeters of the surface of the bottom with a dredging device.

The conventional dredging device is provided with a stirring blade provided with a blade at the tip, for example, in order to efficiently suck mud even when the water bottom is hard or contains a lot of stones. The mud was sucked by rotating the water and scratching the bottom of the water. However, such a conventional dredging apparatus has a problem in that there is a risk that radioactive cesium that has settled at the bottom of the water may diffuse into water.

Therefore, there has been a demand for a technique for scooping mud with a dredging device without diffusing radioactive cesium that has settled at the bottom of the water into the water. Patent document 1 is for solving such a subject.

Utility Model Registration No. 3196857

In Patent Document 1, sandwiched between an upper surface that protrudes at least partially from the lower surface described later relative to the traveling direction, a lower surface that recedes at least partially from the upper surface relative to the traveling direction, and an upper surface and a lower surface. An intake opening structure for a bag made up of an intake opening that is opened in the direction of travel, a fence that is provided in the intake opening, and that prevents clogging of the pipe when sucked in, and an intake opening Is described. According to the technique described in Patent Document 1, it is possible to provide a dredging inlet structure suitable for scooping up while suppressing the raising of polluted mud on the bottom of the water due to radioactive cesium or the like.

However, the dredging device scoops the contaminated mud from the bottom of the water while moving, and there remains a problem that the contaminated mud of radioactive cesium may roll up during the movement. Therefore, there has been a demand for a technique capable of preventing the radioactive cesium-contaminated mud from rolling up during the movement of the dredger.

In order to solve such a problem, the present invention provides a dredge device having a control function related to the movement of the dredge device.

Specifically, the upper surface, the rear surface disposed at the rear end in the traveling direction of the upper surface, the side surface, the intake port for sucking up mud or sand to be dredged provided near the lower end of the rear surface, and a width of 60 cm An opening with a width of 100 cm and an opening height of 20 cm to 50 cm, and a fence for preventing an object with a size that the inlet is clogged from the upper front surface to the lower rear surface. The mud at the bottom of the pond or the like is moved forward by the power of a support column that supports the dredging intake structure from above the floating structure on the water surface and a motor that moves the support column forward. This is a dredging device that removes mud and sand at the bottom of a pond etc. by sucking up sand and sand sequentially, with a resistance detection unit that detects resistance applied to the supporting pillar that moves forward, and moderate resistance 9m / in some cases When the resistance is low, it is advanced at a speed of 10.8 m / 5 min or more, and when the resistance is high, it is 7.2 m / 5 min or less. A dredging device having a forward speed setting unit for controlling a motor to advance at a speed is provided.

In addition to the features, the resistance detection unit outputs a case where a load of 3 kilogram weight plus or minus 20% is applied to the support column as a medium resistance, and 2.4 to the support column. A resistance output means that outputs a low resistance when a weight less than kilogram weight is applied and outputs a high resistance when a weight of 3.6 kilogram weight or more is applied to the support column A scissor device having

Further, as a dredging method, an upper surface, a back surface disposed at the rear end of the upper surface in the traveling direction, a side surface, an intake port for sucking up mud or sand to be dredged provided near the lower end of the back surface, and an opening A fence for preventing the entry of an object whose size is clogged up from the front front end toward the lower end of the rear surface, and a support pillar from above the floating structure on the water surface. A dredging method that removes mud and sand at the bottom of a pond, etc. by a predetermined thickness by sucking up mud and sand at the bottom of a pond, etc. In this case, there is provided a scissors method including a resistance detection step of detecting a resistance applied to the supporting column that moves forward, and a forward speed setting step of controlling the motor in order to control the forward speed according to the detection result.

In addition, the upper surface, the rear surface disposed at the rear end in the traveling direction of the upper surface, the side surface, the intake port for sucking up mud or sand to be dredged provided near the lower end of the rear surface, and the width from 60 cm to the width It has an opening of 100 centimeters and an opening height of 20 centimeters to 50 centimeters, and a fence for preventing an object having a size that the intake opening is clogged from the substantially upper end of the upper surface toward the lower end of the back surface. Supporting the dredging intake structure from above the floating structure on the surface of the water using a support column, and moving the support column forward by the power of the motor sequentially sucks up mud and sand at the bottom of the pond, etc. This is a dredging method for removing mud and sand at the bottom of a pond or the like by a predetermined thickness, and a resistance detection step for detecting a resistance applied to a supporting column that moves forward, and 9m / 5 minutes When the resistance is low, advance at a speed of 10.8 m / 5 minutes or more, and when the resistance is high, a speed of 7.2 m / 5 minutes or less. And a forward speed setting step for controlling the motor to move forward.

In addition to its features, medium resistance is 3 kilogram weight plus or minus 20% for the support column, and low resistance is 2.4 kilogram weight or less for the support column. A degree of resistance provides a dredge method that is at least 3.6 kilograms heavy against the support column.

  According to the present invention, it is possible to provide a dredge apparatus having a function capable of preventing the contaminated mud of radiation cesium from rolling up when the dredge apparatus is moved.

Diagram showing the structure of the bag intake structure The figure which shows the basic composition of the intake structure for firewood The figure which shows the basic composition also including the support pillar for advancing the intake structure for firewood as a part of the firewood device Diagram showing the shape of the inlet 示 す Diagram showing the overall structure of the device The figure which shows an example of a floating structure in case a support trolley advances on the rail laid on the floating structure FIG. 6A is a view of the floating structure of FIG. 6 as viewed from above (a), (b) front, and (c) side. The figure which shows an example of the dredge apparatus provided with the weight sensor The figure which shows an example of the method of the resistance detection by a weight sensor The figure which shows an example of the response | compatibility of the change added to the resistance applied to the bag intake structure, and a forward speed The figure which shows an example of the processing method of this invention The figure which shows the flowchart from the start to the completion of the dredging process

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The first embodiment relates to claims 1, 2, 3, and 4. In addition, this invention should not be limited to these Examples at all, and can be implemented in various modes without departing from the gist thereof.

<Overview>
The dredge apparatus in the present embodiment removes mud and sand at the bottom of the pond by a predetermined thickness by sucking up mud and sand at the bottom of the pond and the like by advancing the dredging inlet structure. It is a dredge apparatus which has a resistance detection part which detects resistance, and a forward speed setting part which controls a motor so that a forward speed may be changed according to the grade of resistance.

Regarding the dredge apparatus in the present embodiment, (1) the structure of the dredge intake structure in the dredge apparatus, (2) the structure for moving the dredge apparatus, and (3) the function for setting the forward speed and The processing method will be described separately.

<Structure of bag intake structure>
FIG. 1 is a diagram showing a structure of a bag intake structure. The bag intake structure (0100) includes an upper surface (0101), side surfaces (0102a, 0102b), a back surface (0103a, 0103b), a fence (0104) and an intake port (0108) present at the opening. Yes. This dredging intake structure scoops sand (0105) and mud (0106) from the opening fence while moving in the traveling direction (0107), and sucks it up to the intake (0108). By having the upper surface and directing the opening toward the bottom of the water, it is possible to improve uptake efficiency and prevent winding. Moreover, by comprising only the opening provided with the fence without providing the lower surface, the opening surface is widened, which can lead to an improvement in uptake efficiency. Further, since there is no bottom surface, it is possible to prevent sand or mud from being dug on the bottom surface to cause winding.

The rear surface is disposed at the rear end in the traveling direction of the upper surface. The shape of the back surface may be a convex shape having the inlet portion as a vertex as shown in FIG. 1 or a flat plate. However, a convex shape having the intake port portion as the apex is more preferable because unevenness is eliminated in the portion where the suction force of the intake port is transmitted.

2 and 3 are views of the bag intake structure as viewed from (a) above, (b) front, and (c) side. Among these, FIG. 2 is a figure which shows the basic composition of the intake structure for straw. On the other hand, FIG. 3 is a diagram showing a basic configuration including a support column for advancing the bag intake structure as a part of the bag device.

In FIG. 2, (a) from above, the top surface (0201), the side surfaces (0202a, 0202b), and the back surface (0203a, 0203b) can be observed, and it can be seen that the intake port (0208) is provided on the back surface. Next, (b) From the front, the fence (0204) provided on the upper surface (0201), the side surfaces (0202a, 0202b), and the opening (0209) can be observed, and the intake port (0208) is provided. I understand. Next, from (c) side, the top surface (0201), the side surface (0202b), and the back surface (0203b) can be observed, and it can be seen that the intake port (0208) is provided on the back surface. And the shape of the fence (0210) at the time of observing from the side is comprised so that a gentle curve may be drawn toward the back lower end from the approximate front end of the upper surface. By drawing a gentle curve, it is possible to prevent sand and mud from being dug up. In FIG. 2, unlike FIG. 3, the support column for advancing the heel intake structure as part of the heel device cannot be observed, but the advance direction using the intake (0208). It is conceivable to move it with force.

In FIG. 3, (a) From above, the top surface (0301), side surfaces (0302a, 0302b), and back surface (0303a, 0303b) can be observed, and an intake port (0308) is provided on the back surface. In addition to this, it can be seen that a support column (0309) is provided on the upper surface. Next, (b) from the front, the fence (0304) provided on the upper surface (0301), the side surfaces (0302a, 0302b), and the opening (0310) can be observed, and the intake port (0308) is provided. In addition to this, it can be seen that a support column (0309) is provided on the upper surface. Next, from (c) side, the top surface (0301), the side surface (0302b), and the back surface (0303b) can be observed, and it can be seen that the intake port (0308) is provided on the back surface.

The intake port is provided in the vicinity of the lower end of the back surface and exhibits a function for sucking up mud and sand to be dredged.

As a result of pursuing uptake efficiency, the opening can absorb mud and sand most efficiently with a width of 60 cm to 100 cm and an opening height of 20 cm to 50 cm. It is.

FIG. 4 is a diagram showing the shape and size of the opening. The description of each part in FIG. 3 is assumed. The width (L1) of the intake port is preferably in the range of 60 centimeters to 100 centimeters. If it is less than 60 centimeters, the capture range becomes too narrow. On the other hand, when it exceeds 100 centimeters, unevenness occurs in the way the suction force is transmitted. If it is in the range of 60 centimeters to 100 centimeters, the suction force is evenly transmitted in an appropriate capture range, and suction can be performed without unevenness. Next, the opening height is preferably in the range of 20 centimeters to 50 centimeters. If it is less than 20 centimeters, the range in which the suction force is transmitted becomes narrow. On the other hand, if it exceeds 50 centimeters, there is a risk that the mud rolls up. If it is in the range of 20 centimeters to 50 centimeters, the suction force can be transmitted to an appropriate range, and the height can be maintained so that the mud does not roll up.

Next, the fence provided in the opening plays a role of preventing an object having a size in which the intake is clogged from the substantially front end of the upper surface toward the lower end of the back surface. It is desirable that the opening width divided by the fence is a width that does not allow the tree branches accumulated on the bottom of the water to enter the size of the intake port and does not impair the intake efficiency. Specifically, the width is desirably narrower than the diameter of the intake port. Furthermore, it is desirable that the width is not more than half the diameter of the intake port in order to prevent entry more reliably. For example, when the diameter of the intake port is 20 cm, the opening width divided by the fence is 10 cm or less.

<Structure for moving the dredge device>
Next, the structure for moving the dredging device is such that the support carriage that supports the support column of the dredging inlet structure moves on the floating structure while scooping the mud deposited on the bottom of the water. It is. This floating structure is preferably fixedly arranged on the surface of the pond. As a method for realizing the floating structure, a method of fixing the floating structure by tension by connecting to the shore of the pond with a rope or the like can be considered. The muddy soil removed is discharged through a pump.

FIG. 5 is a diagram showing a structure of the entire dredge apparatus. A support carriage (0504) having a motor (0503) that supports the support pillar (0502) of the dredging inlet structure (0501) moves on the floating structure (0505), so that the mud on the bottom (0506) It is configured to move while scolding. The scooped mud is discharged through a pump (0507).

As a method of moving the support carriage, a form of traveling on a rail laid on the floating structure can be considered. According to this aspect, since the support carriage can move straight, the movement of the bag intake structure connected by the support pillar can also be kept straight.

FIG. 6 is a diagram illustrating an example of a floating structure when the support carriage travels on a rail laid on the floating structure. A floating structure (0602) floats on the water surface (0601), and a rail (0603) is laid on the floating structure.

7 is a view of the floating structure of FIG. 6 as viewed from (a) above, (b) front, and (c) side. It is U-shaped when viewed from above, and is rectangular when viewed from the front and side. The floating structure is configured by connecting the partial blocks constituting the floating structure. However, as shown in the figure, each partial block preferably has the same shape and an aspect ratio of 2: A rectangular parallelepiped of about 3 is desirable. This is because, if the shape is the same, various variations of floating structures can be configured by devising the number and direction of connecting the partial blocks. Note that the overall shape of the floating structure is merely an example, and the shape seen from above is not limited to a U-shape.

A motor may be used to advance the support column. The power from the motor is transmitted to the support column, and the entire dredging device connected by the support column moves, so that the entire dredging device including the dredging inlet structure moves forward, and mud and sand at the bottom of a pond etc. For example, the mud and sand at the bottom of a pond or the like are removed by a predetermined thickness by sucking up the water and the like sequentially.

Thus, when the support carriage travels on the rail of the floating structure, the bag intake structure connected by the support column moves in the traveling direction.

<Function and processing method for setting forward speed>
Next, the saddle device in the present embodiment includes a resistance detection unit that detects resistance applied to the supporting column that moves forward, and a forward speed setting unit that controls the motor so as to change the forward speed according to the degree of resistance. Have.

The cause of the resistance applied to the support pillar is considered to be the influence of the amount and density of the dredged object such as mud, as far as the resistance in the direction opposite to the traveling direction applied to the dredged intake structure is concerned. For example, the greater the amount of wrinkle targets, the greater the resistance. Also, the higher the density of the wrinkle object, the greater the resistance. If the dredging inlet structure is moved at a high speed when the amount of the dredging target is large or dense, there is a risk that the dredging target will roll up. Therefore, in order not to roll up the heel object, it is desirable to detect the resistance applied to the supporting column that moves forward and to devise a method for changing the forward speed according to the detected degree of resistance.

The method for detecting the resistance applied to the supporting column moving forward is, for example, calculating the resistance by measuring the distance that the supporting column receives the resistance and moves around the fulcrum with a weight sensor attached to the supporting carriage. You may do it. The weight sensor in this case is a method of calculating the resistance based on the distance that the support column moves or the distance from the weight sensor.

FIG. 8 is a diagram illustrating an example of a dredge device provided with a weight sensor. When resistance in the direction opposite to the traveling direction is applied to the bag intake structure (0802) of the bag device including the weight sensor (0801), the support column (0804) is centered on the fulcrum (0803). It will be pushed and moved in the opposite direction. The resistance applied to the support column is measured by measuring the distance between the movement or the weight sensor and the support column. The installation position of the weight sensor here is the distance from the fulcrum (0803) to the support column (0804) that has a vertically downward distance (α) in the range of 30 cm to 70 cm and descends vertically from the fulcrum. It is desirable that (β) is in the range of 0.5 cm to 2.0 cm.

FIG. 9 is a diagram illustrating an example of a resistance detection method using a weight sensor. Due to the resistance of the support column, it was rotated from the original support column location (0901) around the fulcrum to the location (0902) moved in the direction opposite to the traveling direction, thereby the weight sensor (0903). And the distance will approach. By measuring this approach distance with a meter (0904), the magnitude of the resistance applied to the support column can be calculated.

As other embodiments, for example, when the moving shaft is moved by an electric motor, the load current of the electric motor is detected, the moving speed of the moving shaft is detected, the moving shaft or the rod For example, the measurement value by the pressure sensor attached to the inlet structure may be a detection target.

“Changing the forward speed according to the degree of resistance” means a forward speed change in which the forward speed is decreased when the resistance is large and the forward speed is increased when the resistance is large. Specifically, when the resistance is medium, it is advanced at a speed of 9 m / 5 minutes plus or minus 20%, and when the resistance is low, it is advanced at a speed of 10.8 m / 5 minutes or more. If the resistance is high, it is advanced at a speed of 7.2 m / 5 minutes or less.

Also, the low resistance is less than 2.4kg weight for the support column, the medium resistance is 3kg weight plus or minus 20% for the support column, and the high resistance is for the support column. It is desirable that the weight is not less than 3.6 kilograms. Therefore, the resistance detection unit outputs a case where a load of 3 kg weight plus or minus 20% is applied to the support column as a medium resistance, and a weight of 2.4 kg weight or less is applied to the support column. Even if it has resistance output means that outputs the case where it is added as a low resistance, and outputs the case where a weight of 3.6 kilograms or more is applied to the support column as a high resistance good.

FIG. 10 is a diagram illustrating an example of a correspondence relationship between the resistance applied to the bag intake structure and the change in the forward speed. For example, when the density is dense, such as a hard clay layer, a resistance of 3.6 kg or more is added, and the forward speed is 7.2 m / 5 minutes or less. For example, when the density is normal, such as a soft clay layer, a resistance of 3.0 kg weight plus or minus 20% is added, and the forward speed is in the range of 9.0 m / 5 minutes plus or minus 20%. For example, when the density is sparse and dense such as a floating mud layer, a resistance of 2.3 kg weight or less is added, and the forward speed is 10.8 m / 5 minutes or more. When these forward speeds are exceeded, mud hoisting occurs to the extent that it can be visually confirmed. On the other hand, work efficiency falls that it is less than these advance speeds.

Then, the dredging process is completed by repeating such control of the forward speed. It is desirable to intermittently measure the resistance and control the forward speed as a result. This is because if the forward speed changes, the resistance changes even if the density of the layers is the same, so it is desirable to adjust to an appropriate speed each time.

Further, although not an essential element in the present embodiment, a “load notification unit” that performs a function of notifying a moving load applied to the moving shaft by sound may be provided. For example, when an excessive load is detected, a warning sound may be used for notification, or when not only the warning sound but also the moving load is within a normal range, a notification may be given using some sound. Alternatively, notification by sound may be performed when the moving load is outside the normal range. Moreover, you may notify by the sound volume according to the grade of movement load. Such notification by sound can be performed based on the detection result by the detection unit described above.

In addition, when the moving shaft is moved using a rotational motion of an engine or an engine, a rotation sound generated with the rotation of the engine or the engine may be used as a notification sound. When an excessive movement load occurs, the rotation of the engine and the engine increases, and the rotation sound changes accordingly, so that the excessive load is notified. Note that these rotational sounds may be amplified and output.

Furthermore, a “moving shaft height adjusting portion” that functions to move the moving shaft up and down in accordance with the moving load may be provided in the bag. For example, when the dredging inlet structure is submerged in the bottom of the water and prevented from moving, the movement load increases. In this case, the moving shaft height adjusting unit raises the saddle intake structure that has been submerged by moving the moving shaft upward. In addition, when the dredging inlet structure moves away from the water bottom, the moving load is reduced compared to when dredging. In this case, the moving shaft height adjusting portion moves the moving shaft downward, and thus the dredged intake structure can be appropriately brought into contact with the water bottom.

In addition, the present invention supports, as the above-described processing method, the above-described salmon intake structure using a support column from above the floating structure on the water surface, and advances the support column by the power of the motor. This is a dredging method that removes mud and sand at the bottom of the pond etc. by a predetermined thickness by sucking up mud and sand at the bottom of the pond etc. sequentially, and a resistance detection step for detecting the resistance applied to the supporting column moving forward When the resistance is medium, it is advanced at a speed of 9 m / 5 minutes plus or minus 20%, and when the resistance is low, it is advanced at a speed of 10.8 m / 5 minutes or more, and the resistance is high. And a forward speed setting step for controlling the motor to advance at a speed of 7.2 m / 5 minutes or less. The medium resistance here is 3 kilogram weight plus or minus 20% for the support column, the low resistance is 2.4 kilogram weight or less for the support column, and the high resistance is It is desirable that the weight is not less than 3.6 kilograms with respect to the support column.

FIG. 11 is a diagram showing the processing method of the present invention. This is a dredge method comprising a resistance detection step (S1101) and a forward speed setting step (S1102).

FIG. 12 is a diagram illustrating an example of a flowchart from the start to the completion of the dredging process. Start with a forward speed in the range of 9.0m / 5 minutes plus or minus 20%. And measure the degree of resistance, if the resistance is low, set the forward speed to 10.8 m / 5 min or more, ask whether to complete the dredging process, if not, measure the degree of resistance again, It will repeat afterwards. If the resistance is medium, the forward speed is maintained, and it is asked whether the dredging process is completed. If the resistance is not completed, the resistance is measured again, and then repeated. If the resistance is high, the forward speed is set to 7.2 m / 5 minutes or less, and it is asked whether or not the dredging process is completed. If the resistance is not completed, the resistance is measured again and repeated thereafter.

Bag intake structure: 0100, 0501, 0802
Upper surface: 0101, 0201, 0301
Side: 0102, 0202, 0302
Back: 0103, 0203, 0303
Fence: 0104, 0204, 0304
Sand: 0105
Mud: 0106
Intake port: 0108, 0208, 0308
Support pillar: 0309, 0503, 0804
Motor: 0503
Supporting cart: 0504
Floating structure: 0505, 0602
Mud: 0506
Pump: 0507
Water surface: 0601
Rail: 0603
Weight sensor: 0801, 0903
Support point: 0803
Meter: 0904:

Claims (5)

The top surface;
A rear surface disposed at the rear end of the upper surface in the traveling direction;
Side,
An intake port for sucking up mud or sand to be dredged, which is provided near the bottom of the back;
An opening having a width of 60 cm to a width of 100 cm and an opening height of 20 cm to 50 cm;
A fence to prevent the entry of the size that the intake port is clogged from the front front end to the lower end of the back surface,
And using a support pillar from above the floating structure on the water surface,
It is a dredging method that removes mud and sand at the bottom of the pond etc. by a predetermined thickness by sucking up mud and sand at the bottom of the pond etc. by advancing the support column with the power of the motor,
A resistance detection step for detecting the resistance applied to the supporting column moving forward;
If the resistance is moderate, move forward at 9m / 5min plus or minus 20% speed,
If the resistance is low, move forward at a speed of 10.8 m / 5 min.
A forward speed setting step for controlling the motor to advance at a speed of 7.2 m / 5 min or less when the resistance is high;
Acupuncture method. The moderate resistance is 3 kg weight plus or minus 20% against the support column,
Low resistance is less than 2.4 kilograms weight for the support column,
The dredge method according to claim 1, wherein the high degree of resistance is not less than 3.6 kilograms of weight with respect to the support column. The top surface;
A rear surface disposed at the rear end of the upper surface in the traveling direction;
Side,
An intake port for sucking up mud or sand to be dredged, which is provided near the bottom of the back;
An opening having a width of 60 cm to a width of 100 cm and an opening height of 20 cm to 50 cm;
A fence to prevent the entry of the size that the intake port is clogged from the front front end to the lower end of the back surface,
A support pillar for supporting the dredging intake structure having a floating structure on the water surface;
A motor for advancing the support column;
It is a dredging device that removes mud and sand at the bottom of the pond etc. by a predetermined thickness by sucking up mud and sand at the bottom of the pond etc. by moving forward with the power of
A resistance detector for detecting the resistance applied to the supporting column that advances,
If the resistance is moderate, move forward at 9m / 5min plus or minus 20% speed,
If the resistance is low, move forward at a speed of 10.8 m / 5 min.
When the resistance is high, a forward speed setting unit that controls the motor to advance at a speed of 7.2 m / 5 minutes or less;
A dredge apparatus having The resistance detector
When the load of 3kg weight plus or minus 20% is applied to the support pillar, it outputs as a medium resistance,
When a load of 2.4 kg weight or less is applied to the support column, it is output as a low resistance,
The dredge apparatus according to claim 3, further comprising resistance output means for outputting a case where a weight of 3.6 kilograms or more is applied to the support column as a high resistance. The top surface;
A rear surface disposed at the rear end of the upper surface in the traveling direction;
Side,
An intake port for sucking up mud or sand to be dredged, which is provided near the bottom of the back;
Opening,
A fence to prevent the entry of the size that the intake port is clogged from the front front end to the lower end of the back surface,
And using a support pillar from above the floating structure on the water surface,
It is a dredging method that removes mud and sand at the bottom of the pond etc. by a predetermined thickness by sucking up mud and sand at the bottom of the pond etc. by advancing the support column with the power of the motor,
A resistance detection step for detecting the resistance applied to the supporting column moving forward;
A forward speed setting step for controlling the motor to control the forward speed according to the detection result;
Acupuncture method.

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