JP2002038516A - Submerged sand pump controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect sand in high concentration without being affected by water depth and an ocean current. SOLUTION: In a controller for a submerged sand pump A, by which soil and sand on the bottom of water G sent into water through wires W from a water surface such as a ship S are sucked up to a sand selector M on water through a collecting hose P. The wires W are delivered and taken up and the quantity of soil and sand sucked into the submerged sand pump A is controlled so that the volume and concentration of sucked-up soil and sand are kept within fixed ranges. When concentration is too high, the pump A is positioned in a posture in high load, in which the pump A is buried in soil, and there is the possibility of the damage of the pump. When concentration is too low, inversely, the pump is not faced excellent into soil, and positioned in a posture, in which proper sand collection is not conducted. Accordingly, when the pump reaches fixed concentration width, the optimum posture states of the pump A can be predicted, and smooth sand collection can be conducted. Volume and concentration are computed by multiplying measured values for a unit time of a flowmeter 1 and a densitometer 2 in response to the quantity of sand collected properly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a submersible sand pump for collecting sand from sediment deposited on the sea, rivers, lakes, marshes, dams and the like.

[0002]

2. Description of the Related Art As shown in FIG. 1, a sand sampling facility, for example, a sand sampling ship for sampling earth and sand, sends a sampling hose (suction pipe) P from a ship S through the wire W into the sea (underwater). In general, the tip of the hose P is guided to the water bottom G in accordance with the water depth, and the earth and sand is sucked up on the ship by suction.
The suction operation is performed by a pump in the ship S or by a submersible sand pump A as shown in the figure. The sucked earth and sand is sent to the earth and sand sorting device M by a hose P and is sorted to store sand in the hold. Store in room (hold) B.

[0003] In the sand extraction equipment by the suction action of the submersible sand pump A, the power cable a is guided together with the collection hose P from the ship S to the submersible sand pump A, and the submersible sand pump A is raised and lowered by feeding and winding the wire W. , The hose P and the cable a are wound and unwound on the drum by the reel devices R ₁ and R ₂ on the ship S. Conventionally, generally, the hose P and the reel device for the cable a are separately provided, and the rotation of the drum is usually performed by connecting a driving machine and a drum shaft with a chain. In the hydraulically driven underwater sand pump A, a hydraulic hose is used instead of the power cable a.

[0004] In this sand extraction facility, if the amount of sediment sucked up from the underwater sand pump A (the amount of sediment in the water sucked up) is within a certain width, the underwater sand pump A
Is also smooth and preferable from the viewpoint of durability, and the sand selection device M can perform stable sand selection.

For this reason, a device for controlling the underwater sand pump A to perform stable sand extraction has been developed. For example, Japanese Patent Application Laid-Open No. 58-127842 discloses that the load of the pump A exceeds a set value. In this case, a technique for reducing the load by raising the pump A has been disclosed.
67034, JP-A-10-292421, etc. disclose the position mode (posture) of the pump A according to the feeding amount and load of the wire W for suspending the pump A and the sampling hose P or the inclination angle of the pump A and the sampling hose P. And a technique for controlling the posture so as to optimize the posture is disclosed.

[0006]

In the control of the conventional underwater sand pump A, the load control does not accurately correspond to the amount of sediment collected. On the other hand, in the tilt angle control, when the pump A hits an obstacle such as a rock on the sea floor, the load on the wire W changes, or the tilt angle of the wire W changes.
In addition, the load and the inclination angle change due to the influence of the water depth and the current. Due to these changes, it is difficult to accurately grasp the load and the inclination angle, it is difficult to predict the optimal posture of the pump A, and it is impossible to perform control within a high efficiency range with a large amount of sediment.

SUMMARY OF THE INVENTION It is an object of the present invention to control a submersible sand pump which is hardly affected by water depth, ocean current and the like.

[0008]

Means for Solving the Problems In order to achieve the above object, the present invention relates to a method disclosed in Japanese Patent Application Laid-Open Publication No. Sho 63-45500, wherein a sand content in a sand pipe is measured by a sand pump in a sand basin. Based on the measured value, a technique for controlling the sand pump by controlling the sand pump is disclosed, and it is noted that the sand content is the most appropriate parameter indicating the attitude of the submersible sand pump. The sand rate was taken as the concentration, and the attitude of the pump was optimally controlled based on the concentration.

[0009] If the concentration is too high, the pump will be in a high load posture buried in the soil, which may cause damage to the pump. Conversely, if the concentration is too low, the pump will not be able to successfully come into the soil. He is not in a proper sand pit. For this reason, by setting the concentration range to be constant, the optimum posture state of the pump can be predicted, and the sand can be smoothly collected.

On the other hand, the sand sampling state (pump attitude) is directly controlled by the concentration of the sand being sampled as it is, and the concentration is not affected by the water depth or the ocean current. Therefore, stable high-concentration sand can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a submersible sand pump which is sent into the water from the water of a ship or the like via a wire and sucks up the sediment at the bottom of the water to a sand sorting device on the water through a sampling hose is controlled. In the apparatus, the wire is fed and wound so as to control the amount of sediment suction of the submersible sand pump so that the concentration of the sucked earth is within a certain width. That is, the posture of the pump is adjusted based on the wire feeding amount based on the soil concentration.

In this configuration, the concentration can be a volume concentration, and when the concentration is this volume concentration, it is appropriate to grasp the sand content. That is, simply measuring the concentration of flowing sediment water with, for example, an ultrasonic densitometer is the instantaneous concentration at the measurement point, and the concentration fluctuates, making it difficult to perform appropriate control.

[0013] The volume concentration can be determined, for example, by a concentration meter and a flow meter provided by ultrasonic waves or the like in the earth and sand transporting path from the underwater sand pump to the sand sorting device. It is calculated by multiplying the average concentration over time by the flow rate.

[0014]

This embodiment relates to a control device for a submersible sand pump A in a sand sampling boat S shown in FIG. 1, and the submersible sand pump A changes its posture by feeding and winding three wires W. Controlled. The three wires W are fed and wound by the electric winches C ₁ , C ₂ and C ₃ .

As shown in FIG. 2, a flow meter 1 and an ultrasonic densitometer 2 are interposed in the sampling hose P, and the measured values are sent to a control panel D on the ship. The control panel D, based on the value, to control the winch C ₁ -C _3.

For example, the allowable range of the apparent volume concentration c (%) of the sand to be collected on the sand bottom is defined as a to b (%), and the values a and b are set to the control panel D. To enter. Then, during operation, the apparent volume concentration c is calculated by multiplying the measured values per unit time from the flow meter 1 and the concentration meter 2.
In the case of a> c, the wire W is paid out and the underwater sand pump P is buried in the seabed G until a ≦ c ≦ b,
When b <c, the wire W is wound up and the submersible sand pump P is raised from the seabed G until a ≦ c ≦ b, so that the apparent volume concentration always becomes a ≦ c ≦ b. Controls the feed amount.

At this time, if the concentration becomes abnormal, the sampling hose P is clogged and sampling cannot be performed. Therefore, assuming that the abnormal concentration is d (%), when c> d, the wire W is forcibly wound up until c = 0 and the load on the underwater sand pump A is reduced. Thereafter, the operation shifts again to the operation of sand removal under the above control.

The above control can be performed manually by visual observation of the density c, but it is preferable to perform the control automatically. In addition, the situation of various water bottoms G is grasped in each actual operation, etc., and the optimum concentrations a and b are calculated, and each water bottom G is calculated.
Create the density pattern of
Each pattern can be called and controlled.

Although this embodiment is a case of the sand sampling boat S, the present invention can be applied to all sand extraction facilities such as a structure in which a structure is guided on the water and a sand extraction facility is provided thereon. Needless to say.

[0020]

According to the present invention, the attitude of the underwater sand pump is controlled based on the concentration as described above, so that the control can be performed remotely, and each parameter of the concentration can be input. It is very simple because it can be done just by doing. In addition, even an operator other than a skilled operator can easily operate.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a sand sampling boat employing one embodiment.

FIG. 2 is a control diagram of the embodiment.

[Explanation of symbols]

1 flowmeter 2 densitometer A water sand pump C _1, C _2, C ₃ wire winch D control panel M sand sorter P collected hose W wire G seabed

Claims (3)

[Claims] 1. A control device for an underwater sand pump A which is sent into the water from the water such as a ship S via a wire W and sucks up the earth and sand at the bottom G into a sand sorting device M on the water via a sampling hose P. A control device for a submersible sand pump, wherein the wire W is unwound and wound to control the amount of sediment sucked into the submersible sand pump A so that the concentration of the sucked sediment is within a certain width. 2. The control device for an underwater sand pump according to claim 1, wherein the concentration is a volume concentration. 3. A density meter 2 and a flow meter 1 are interposed in a sediment transport route from the underwater sand pump A to the sand sorting device M, and the volume concentration is calculated from the measured values of the density meter 2 and the flow meter 1. The control device for a submersible sand pump according to claim 2, wherein the control is performed.