JP2978681B2 - Detection mechanism of mud surface level to be targeted for mud sampling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for detecting the level of the mud surface of the mud to be collected in front of the mud sampling section of the mud collector with the movement of the dredger. About.

[0002]

2. Description of the Related Art At present, in collecting mud such as sludge deposited on the bottom of water in rivers, lakes and marshes, sea areas, for example, a mud extractor having a basic structure shown in FIG. 5 is often used. This mud sampler has an opening 101 on one side and the opening 1
It is mainly constituted by a mud collecting box 100 provided with a mud suction pipe 102 on the side opposite to the side 01. The mud suction pipe 102 is connected to a pump (not shown) on the ship, and is configured to be able to apply a negative pressure to the mud collection box 100 by operating the pump. . Therefore, when this mud sampler is moved on the bottom where mud is deposited with the opening 101 side facing forward, the opening 1
01, the mud is stored in the mud collecting box 100, and the mud can be sucked up on the ship through the mud suction pipe 102 by operating the pump.

[0003] However, if the moving speed of the mud sampling device is too high, the mud surface of the mud to be collected is not covered with the opening 10 of the mud collecting device.
1) It is formed too high in front (the level indicated by N-1 in FIG. 5), and the mud that exceeds the upper edge of the opening of the mud collector overflows from the opening side of the mud collector toward the rear side of the moving of the mud collector. There is a situation in which the mud to be discharged and collected is left behind in the area where the mud sampling device is moved and the mud sampling operation ends. On the other hand, if the moving speed of the mud sampler is too slow, the mud surface of the mud to be collected is not formed properly in front of the opening 101 of the mud collector so as to cover the opening (N-2 in FIG. 5). , A large amount of water enters into the mud collecting box 100 of the mud collector, and the mud collecting efficiency is reduced. In addition, when the ratio of water to the collected mud is large, a large-scale treatment facility is provided to separate the mud from the water, and it becomes necessary to further purify the polluted water and discharge it.

[0004] Under these circumstances, a sensor for detecting the mud surface level of the mud which is formed in front of the opening of the mud collector is provided in the mud collector, and the constantly changing mud surface level is grasped on the water. However, a technique for operating a mud extractor corresponding to the mud surface level is used. For example, Japanese Patent Application Laid-Open
In the "water bottom traveling dredging device" according to No. -33651, a mud surface level detection sensor is provided immediately above the opening of the suction body and on the upper frame of the suction body.
When the sensor provided immediately above the opening is not operating, it can be said that the mud surface is formed below the upper edge of the opening, and water is sucked from the opening and the suction efficiency of the pump is reduced. Control is performed to reduce the rotation speed of the suction pump. On the other hand, when the sensor provided in the upper frame is operating, it can be said that the mud surface is formed above the upper edge of the opening, and the mud overflows without being sucked from the opening. Since a situation occurs in which the suction body is left behind behind the movement of the suction body, control is performed to increase the rotation speed of the suction pump. In this apparatus, a magnet piece is provided at a free end of a resistance plate attached in a suspended state with a hinge, and this resistance plate is made rotatable, and the resistance plate is turned in the pushing direction by mud pressure. A sensor that detects a mud surface level by contacting a magnet piece with a separately provided magnet switch is used.

[0005]

However, when the mud enters between the resistance plate and the magnet switch, or when the mud adheres to the resistance plate itself, the sensor of the above-mentioned device interferes with the mud. Even if pressure is applied, the resistance plate may not rotate in the pushing direction, or the magnet switch may not open even if the resistance plate is pressed, and mud pressure, and thus mud surface level, can always be reliably detected. Did not. It can be said that such a non-operation of the sensor is not so much of a problem as long as the state of the vicinity of the sensor can be appropriately confirmed, the recovery can be performed by taking measures such as removing mud quickly. However, in reality, there is no means to check the condition of the sensor at the bottom of the water during the mud sampling work from the ship, so if the sensor does not work properly, the mud surface will not be properly formed at the opening of the suction body In the state, while leaving the mud to be collected, etc.
There was a possibility that the mud sampling work would be continued.

On the other hand, instead of such a dynamic means for detecting mud pressure, means for identifying a mud surface by, for example, an underwater camera, and a device for irradiating infrared rays and gamma rays and a detecting device are provided near the opening of the mud sampler. Provided, means for identifying whether or not a mud surface is formed between the irradiation device and the detection device from the ratio of the transmission amount to the irradiation amount of infrared rays and the detection amount,
Means for identifying a mud surface by using an ultrasonic irradiation device and a device for detecting a reflected wave thereof are also used. However, sensors using such means are expensive and require specialized knowledge in their operation and management.

Therefore, the present invention has a simple structure, can always accurately detect the mud surface level, can be easily operated, managed, and adjusted without special technical knowledge, and is relatively inexpensive. It is an object of the present invention to provide a mud surface level detection mechanism.

[0008]

According to the present invention, in order to achieve the above object, a mud surface level detecting mechanism for mud sampling or the like is provided. Pipes 10 and 100 provided in a mud sampling section of a mud sampler so that the other end of the pipe protrudes above the water surface. The pipes 10 and 100 are provided with pressure-sensitive means 20 for closing the pipes 10 and 100 in a watertight manner. , 200
And the inside of the tubes 10 and 100 above the pressure-sensitive means 20 and 200 is filled with the liquid W. Further, in the invention of claim 2, the pressure-sensitive means 20, 200 have a structure capable of being deformed by mud pressure toward the side where the liquid W is filled.

[0009]

According to the mechanism for detecting a mud surface level to be subjected to mud sampling or the like according to the present invention, one pipe end is projected to a mud sampling section of a dredging sampler and the other pipe end is projected to the water surface. Pipe 1 provided
0, 100, wherein the tubes 10, 100 have the tubes 10,
The pressure-sensitive means 20 and 200 for closing the pressure-sensitive member 100 in a watertight manner are provided, and the pipe 1 above the pressure-sensitive means 20 and 200 is provided.
Since the inside of 0, 100 has a structure filled with the liquid W, when pressure is applied to the pressure-sensitive means 20, 200,
The liquid level w of the liquid W filled in the tubes 10 and 100
Is raised.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a typical embodiment of a mud surface level detecting mechanism according to the present invention will be described with reference to FIGS.

First, a detection mechanism according to this embodiment will be described with reference to FIGS.

This detection mechanism comprises a pipe 10 and pressure-sensitive means 20 for closing one end of the pipe 10 in a watertight manner. The pipe 10 is provided so that the pipe end side closed by the pressure sensing means 20 is placed in water, and the other pipe end side is placed on a floating body F on the water surface S. On the other hand, the pressure sensing means 20 is, for example, a bowl-shaped case 22 that closes the opening 22 a with a pressure sensing slope 21, and has a communication hole 23 that communicates with the pipe 10. The pressure-sensitive plate 21 and the case 22 are connected to the peripheral edge of the pressure-sensitive plate 21 and the opening 2 of the case 22.
It is assembled by covering the space between the peripheral edge 2a and the peripheral edge of the space 2a with a membrane plate 24 in a watertight manner.

As shown in FIG. 2, the inside of the tube 10 and the pressure sensing means 20 is filled with a liquid W. In this embodiment, the liquid level of the liquid W is higher than the water level S. The filling amount of the liquid W is adjusted so as to perform the above operation. In this case, the pressure caused by the height h of the liquid surface w of the liquid W with respect to the water surface S is applied from the inner surface side to the outer surface side of the pressure-sensitive plate 21. Therefore, in this embodiment, particularly, one end of the spring 25 having a tensile force substantially equal to this pressure is attached to the inner surface of the pressure-sensitive plate 21, and the other end is attached to the bottom surface 22 b of the case 22.
The pressure from the inside to the outside of the pressure-sensitive plate 21 and the spring 25 from the outside to the inside of the pressure-sensitive plate 21
And tensile force. Therefore, as shown in FIG. 3, when a slight force P is applied to the pressure-sensitive plate 21 from the outer surface side of the pressure-sensitive plate 21 toward the inside of the case 22, The balance between the pressure and the tensile force is broken, and the pressure-sensitive plate 21 is pushed in. As shown in FIG. 3, the liquid level w of the liquid W rises by h ′ shown in FIG.

Therefore, according to the present embodiment, the presence or absence and the magnitude of the pressure applied to the outer surface of the pressure sensitive plate 21 in water are determined by the displacement of the liquid level w of the liquid W filled in the pipe 10. Can be detected.

In the present embodiment, the liquid W is sealed so that the liquid level w of the liquid W filled in the pipe 10 is higher than the water level S. Liquid W in the pipe 10 so that the water and the water surface S are at the same level.
In this case, since the pressure for pushing the pressure sensitive plate 21 from the inner surface side to the outer surface side of the pressure sensitive plate 21 is not separately applied, the spring 25 is not particularly provided. Also, a slight pressure applied from the outer surface of the pressure sensitive plate 21 can be detected as a change in the liquid level w of the liquid W.

FIG. 1 schematically shows the structure of a detection mechanism to which the above-described embodiment of the present invention is more specifically applied. This detection mechanism includes a connecting pipe 100, a pressure sensing means 200, and a display pipe 300.

As long as the connecting pipe 100 is an elongated hollow object capable of being filled with a liquid, the connecting pipe 100 may be made of a soft cylinder or pipe, regardless of its shape and material. The connecting pipe 1 is made of a flexible tube or the like.
00 may be configured.

The pressure-sensitive means 200 is mainly composed of a bowl-shaped case 201 having one side open, and a pressure-sensitive plate 202 for closing the opening of the case 201. The diameter of the pressure-sensitive plate 202 is slightly smaller than the diameter of the opening of the case 201, and a film plate 203 having no movement resistance is provided between the edge of the pressure-sensitive plate 202 and the opening edge of the case 201. Is stuck and is closed watertight.

At substantially the center of the inner surface of the pressure-sensitive plate 202,
One end of the tension coil spring 204 is assembled. The other end of the spring 204 is attached to one end of a connecting rod 205 housed in a hole provided at a substantially central portion on the bottom side of the case 201. This connecting rod 205
Is provided with a female screw hole at the other end thereof, and a screw portion of the adjusting screw 206 is screwed into the female screw hole. On the other hand, the adjusting screw 206 is inserted into the hole 207 such that the head surface on the standing side of the screw portion contacts the edge surface of the hole 207 communicating with the inside and outside of the case 201. Therefore, by appropriately rotating the adjusting screw 206 in the hole 207,
The dimension of screwing the screw portion of the adjusting screw 206 into the connecting rod 205 can be changed. If the screw-in dimension increases, the connecting rod 205 is drawn toward the hole 207 into which the adjusting screw 206 is inserted, so that the pressure-sensitive plate 202 is also directed into the case 201 via the spring 204. Will be pulled.

A protruding portion 202 a is provided on the periphery of the pressure-sensitive plate 202 toward the inside of the case 201. Even if a force is applied to the pressure sensitive plate 202 toward the inside of the case 201 beyond the limit of the amount of elastic deformation of the membrane plate 203, the projecting portion 202
By contacting a with the bottom surface of the case 201, the film plate 203 is not broken or the like.

Reference numeral 208 in the figure denotes a cap for improving the watertightness of the mounting hole 207 of the adjusting screw 206. Reference numeral 209 in the figure denotes a support plate for mounting the pressure-sensitive means 200 to an appropriate mounting object, and reference numeral 210 denotes a support plate for connecting the other end of the connection pipe 100 to the other end. A hole for assembling and connecting the connecting pipe 100 and the pressure-sensitive means 200.

The display tube 300 has one end connected to the connecting tube 100.
It is mainly composed of a pipe that communicates with. The display tube 3
In 00, a watertight cylindrical float 301 having a diameter slightly smaller than the inner diameter of the display tube 300 is stored. A ring 301 is provided at both ends of the float 301.
a is fitted. A cap 302 having an air hole 302a is shown by reference numeral 302 in the figure, and a liquid W in the display tube 300 is shown by reference numeral 303 in the figure.
This is a valve for fine adjustment of the water level.

Therefore, in the detection mechanism shown in FIG. 1, the float 301 can be moved up and down in the display tube 300 in accordance with a change in the liquid level w of the liquid W in the display tube 300. If the display tube 300 is made of a translucent glass, plastic material, or the like, the float 301 can be used.
The change in the liquid level w can be easily grasped by visually recognizing the vertical movement. Further, if a suitable switch such as a proximity switch is opened and closed by the vertical movement of the float 301, the presence or absence of the energized state is displayed by appropriate means, so that the display tube 300 can be located at a distance from the installation position. Also, the vertical movement of the float 301, that is, the change in the liquid level w can be easily grasped.

The pressure sensing means 20, 2 of the detection mechanism described above
For example, the detection mechanism according to the present embodiment is used by assembling 00 with a mud sampler as shown in FIG.

The mud sampler has an opening 101 on one side and a suction pipe 10 on the side opposite to the opening 101.
2 is mainly composed of a mud collecting box 100 provided with the two.
The mud suction pipe 102 is connected to a pump (not shown) on the ship, and is configured to be able to apply a negative pressure to the mud collection box 100 by operating the pump. . Therefore, this mud sampler is connected to the opening 1
When the water bottom on which mud is deposited is moved with the 01 side forward, the mud is stored in the mud collecting box 100 through the opening 101, and the mud is collected by the operation of the pump.
02 on the ship. A mounting plate 103 is provided upright on the opening 101 of the mud sampler,
The pressure-sensitive means 20 and 200 are attached to the upper end and the lower end of the mounting plate 103, respectively, such that the pressure-sensitive plates 21 and 202 are directed toward the moving front side of the mud sampler.

When the mud surface of the mud to be mined is formed high in front of the opening 101 of the mud collector (the level indicated by N-1 in FIG. 4), the mud is attached by the mud pressure of the mud. The pressure-sensitive plates 21 and 202 of both the pressure-sensitive devices 20 and 200 provided at the upper end of the plate 103 and the pressure-sensitive devices 20 and 200 provided at the lower end of the plate 103 are moved by the mud pressure.
00, and as a result, the liquid level w of the liquid W in the tubes 10 and 100 connected to the two pressure-sensitive means 20 and 200 rises. On the other hand, when the mud surface of the mud to be collected is not properly formed in front of the opening 101 of the sampler so as to cover the opening 101 (N-2 in FIG. 4).
Since no mud pressure is applied to the pressure sensitive plates 21 and 202 of the pressure sensing means 20 and 200, the liquid W in the pipes 10 and 100 connected to the pressure sensing means 20 and 200 is not applied. Does not change. On the other hand, the pressure-sensitive means 20, 20 provided at the lower end of the mounting plate 103
The liquid level w of the liquid W in the tubes 10 and 100 connected to 0
Is raised and connected to pressure-sensitive means 20, 200 provided at the upper end of the mounting plate 103.
When there is no change in the liquid level w of the liquid W in 0 and 100,
The mud surface of the mud to be collected is the opening 101 of the sampler.
The opening 101 is sufficiently covered in front and the mounting plate 1
It is in a state where it is formed at a level that does not exceed the upper end of 03 (the level indicated by N-3 in FIG. 4).

Therefore, the tube 1 connected to the pressure-sensitive means 20, 200 provided at the lower end of the mounting plate 103
The liquid level w of the liquid W in 0, 100 is rising, and
Pressure sensing means 2 provided at the upper end of the mounting plate 103
Liquid W in tubes 10, 100 connected to 0, 200
By operating the sludge extractor by adjusting the moving speed of the sludge collector, the number of rotations of the pump, and the like so as to maintain a state in which the liquid level w of the sludge does not change, the mud from the opening 101 of the sludge collector is controlled. Suction of water and the like generated due to the low surface level, and prevention of overflow of mud toward the rear of the movement of the sludge caused by the high mud surface level from the opening 101 of the sludge collector, and highly efficient dredging. can do.

The detecting mechanism according to the present embodiment is configured such that the pressure-sensitive means 20, 200 contacting with mud or the like at the bottom of the water are connected to the openings of the bowl-shaped cases 22, 201 by the pressure-sensitive plates 21, 202.
The structure is extremely simple by closing it, and it is robust without structurally vulnerable parts. Therefore, various obstacles such as household waste and gravel are mixed in the mud deposited on the water floor, but the pressure-sensitive means 20 and 200 are damaged due to contact with such obstacles. Is unlikely to occur,
Suitable for permanent use.

[0029]

The mud surface level detecting mechanism according to the present invention for detecting a mud surface or the like is constructed such that one end of the pipe is located on the mud sampling section of the dredging mud collector, and the other end is located on the water surface. A pipe provided to protrude, the pipe being provided with pressure-sensitive means for closing the pipe in a watertight manner, and having a structure in which the inside of the pipe above the pressure-sensitive means is filled with liquid, When pressure is applied to the pressure-sensitive means, the liquid level of the liquid filled in the pipe is raised. It can be easily and accurately detected from the water surface whether or not mud is present, that is, the level of the mud surface formed in the mud sampling section.

Further, since the presence of the mud in the mud sampling section is detected only by transmitting the pressure applied to the pressure-sensitive means to the liquid in the pipe, the structure is more structurally different from the conventional mud surface level detecting means. Therefore, it is easy to operate, manage and adjust, and can provide a mud-level detection mechanism at relatively low cost.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of a mud surface level detection mechanism.

FIG. 2 is a schematic diagram showing an overall configuration of the detection mechanism.

FIG. 3 is a schematic diagram showing an overall configuration of the detection mechanism.

FIG. 4 is a side view showing a state where the detection mechanism is attached to a mud sampler.

FIG. 5 is a side view showing the outline of the structure of the mud sampler.

[Explanation of symbols]

 Reference Signs List 10 tube 100 tube 20 pressure-sensitive means 200 pressure-sensitive means 21 pressure-sensitive plate 202 pressure-sensitive plate 22 case 201 case 24 membrane plate 25 spring 204 spring

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-33651 (JP, A) JP-A 62-47920 (JP, U) JP-A 51-34459 (JP, U) JP-A 60-4795 170937 (JP, U) Hikaru 4-18364 (JP, U)

Claims (2)

(57) [Claims] 1. A pipe provided with one end of the pipe protruding above the water surface and the other end of the pipe protruding above the water surface, the pipe being closed in a watertight manner. A mechanism for detecting a mud surface level to be subjected to mud sampling or the like, wherein a pressure sensitive means is provided, and a pipe located above the pressure sensitive means is filled with a liquid. 2. A mud surface to be subjected to mud sampling or the like according to claim 1, wherein said pressure sensing means is deformable by mud pressure toward a side filled with said liquid. Level detection mechanism.