JPH0618247Y2 - Height detection device for sedimentation layer in sedimentation tank of sludge - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for appropriately detecting the height of a sedimentation layer which changes in a sedimentation tank of sludge.

[0002]

2. Description of the Related Art Detecting the height of a sedimentation layer is necessary to control the discharge of sedimented thickened mud. Conventionally, when the sedimentation layer is visually observed in the tank, the on-off valve is opened and the concentration is increased. It was discharging mud. Further, a part of the thick mud is taken out and the concentration thereof is measured to detect the precipitation state, or the height of the precipitation layer is detected using an ultrasonic detector to control the opening / closing valve.

[0003]

[Problems to be Solved by the Invention] However, it is necessary to monitor it with the naked eye, and when taking out a part of the thick mud and measuring its concentration, there is variation in the measurement, which is different from the actual precipitation state. It will be inaccurate. Further, although the ultrasonic detector can perform accurate measurement, it has a problem that the equipment is extremely expensive. Therefore, the present invention provides an apparatus that can accurately and quickly measure the height of the sedimentation layer with an extremely simple structure.

[0004]

Therefore, in the present invention, an arm is attached to a stirring rotator provided in a settling tank, the arm is arranged on the tank, and a pulling member is vertically rotatably connected to the arm. A resistance plate is fixed to the lower end of the traction member, the resistance plate is arranged at the bottom of the settling tank, and a detector for detecting the displacement of the traction member that rotates according to the height of the resistance plate is provided.

[0005]

[Function] When the rotating body for stirring is rotated, the arm is rotated on the tank, and the pulling member is rotated accordingly and the resistance plate is dragged. At this time, the resistance plate is caused by the resistance of heavy thick mud. It is always located above the settling layer and never settles inside the settling layer. For this reason, when the precipitation advances and the precipitation layer becomes higher, the resistance plate is also positioned above it, so that the traction member pivots about the connection part with the arm as a fulcrum and tilts deeply as the height of the precipitation layer increases. In this way, when the sedimentation of the sludge progresses and the sedimentation layer becomes higher, the traction material rotates, and the inclination of this traction material is measured by the angle or the distance of rotation to detect the height of the sedimentation layer. Is.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiments of the present invention will be described below. The detection device of this example shown in FIGS. 1 and 2 is attached to a cross-shaped arm 3 connected to a stirring rotator 2 that rotates around the axis of the settling tank 1. In the detection device of this example, the bracket 4 is fixed to a part of the arm 3 in a state of protruding rearward in the rotation direction and connected to the traction member 5 by a pin 6, and the resistance plate is attached to the lower end of the traction member 5. 7 is obliquely fixed, the resistance plate 7 faces the bottom of the settling tank 1, and the arm 3 is provided with a detector 8 for detecting the inclination of the traction member 5. As shown in FIG. 3, the detector 8 has a large number of limit switches 81 arranged concentrically with the pin 6 as an axis, and one of them is brought into contact with the tip of the traction member 5.

The rotating body 2 moves along the chain 9 around the upper outer circumferential groove of the settling tank 1 by driving a motor M fixed to one arm end. A roller 10 that rolls on the upper end surface of is provided.
Further, the chain 11 connected to one end of the stirring blade member 12 is hung on the arm 3 and the stirring blade member 12 is used.
The other end is connected to a ring 13 loosely fitted to the rotary shaft 21.

Next, the operation of this example will be described. First, by driving the motor M, the rotating body 2 rotates and the arm 3 rotates integrally. As a result, the stirring blade 12 is pulled by the chain 11 and rotates while stirring the precipitation layer.
On the other hand, the traction member 5 rotates while pulling the resistance plate 7 by the rotation of the arm 3, but the resistance plate 7 is always positioned above the precipitation layer without being submerged in the precipitation layer due to the resistance of the concentrated thick mud layer. Will be done.

Therefore, the resistance plate 7 is displaced according to the sedimentation state of the sludge, that is, the height of the sedimentation layer, and when the sedimentation layer becomes higher, the resistance plate 7 also moves upward. Therefore, the traction member 5 to which the resistance plate 7 is fixed rotates about the pin 6 as a fulcrum and tilts toward the rotation direction.

At the same time, the tip of the pulling member 5 repels the limit switch 81 depending on the angle of the pulling member 5, and the open / close valve (not shown) is opened by repelling the limit switch at a predetermined position. The sedimented mud should be discharged.

As described above, according to this embodiment, the resistance plate 7 is always positioned above the sedimentation layer to rotate the traction member 5. Therefore, the inclination state of the traction material 5 is detected to detect the height of the sedimentation layer. It is possible to detect this. In addition, the traction member 5 having the resistance plate 7 is connected to the arm 3 and the arm 8 is provided with the detector 8 so that the cost can be reduced.

Although the present embodiment is configured as described above, the present invention is not limited to this. For example, regardless of the type and configuration of the detector, in addition to the angle detector, by measuring and detecting the linear distance F from the starting point E of the traction member to the tip of rotation as shown by the chain line in FIG. It may be one that detects the height of the precipitation layer.

Further, the shapes and materials of the traction member and the resistance plate are not limited, and the connecting structure of the traction member and the arm is appropriate.
As shown in FIG. 4, the traction member 15 having the levitation stopper 16 may be inserted into the mounting ring 14 fixed to the arm.

Further, the rotating structure of the rotating body to which the arm is attached may be arbitrary, and as shown in FIG. 5, a conventional rotating body 17 having a motor M at the center may be used. It is sufficient to connect the traction material.

[0015]

[Effect of the Invention] According to the present invention, the resistance plate is displaced according to the sedimentation state, so that the height of the sedimentation layer can be quickly and accurately detected by the inclined traction material, and the equipment cost is low because of the simple configuration. It has a great effect.

[Brief description of drawings]

FIG. 1 is a plan view of a settling tank using an embodiment of the present invention.

FIG. 2 is an enlarged vertical side view of the main part.

FIG. 3 is an enlarged operational view of a main part of the embodiment.

FIG. 4 is a vertical cross-sectional view of a main part of another example of the traction member.

FIG. 5 is a schematic side view inside a settling tank showing another example of the rotating body.

[Explanation of symbols]

 1 Settling tank 2,17 Rotating body 3 Arm 5,15 Traction material 7 Resistance plate 8 Detector

Claims (1)

[Scope of utility model registration request] 1. An arm 3 is attached to a stirring rotator provided in a settling tank.
Attached to the tank and attached to the arm 3 by the traction members 5, 1
5 is connected so as to be rotatable up and down, the resistance plate 7 is fixed to the lower end of the traction member, the resistance plate 7 is arranged at the bottom of the settling tank, and the traction members 5 and 15 rotate according to the height of the resistance plate 7. 2. A height detecting device for a sedimentation layer in a sedimentation tank of sludge, comprising a detector 8 for detecting the displacement of the sediment.