JPS5935649B2 - Chain tension detection device for sediment scrapers used in sedimentation tanks for sewage treatment plants, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chain tension detection device for a sediment scraper used in a sedimentation tank for a sewage treatment plant or the like.

Chain-based sediment scrapers are generally used in sand basins, sedimentation basins, etc. at sewage treatment plants, but in these types of machines, if the chain stretches due to wear or permanent deformation due to tension during operation, Conversely, overload may occur, and if left unchecked, various problems will occur, so it is customary to use a movable bearing for tension adjustment.

In addition, in order to solve these problems, conventionally the water in the sedimentation tank was drained and the shaft was operated, but for example, in the case of a two-story sedimentation tank, the amount of water change has more than doubled, and the lower tank It is almost impossible to check the elongation of the chain with the naked eye.

Therefore, in order to detect chain tension from outside the tank, attempts have been made to install a motor overload detection section in the chain drive motor and use this to detect chain overload. This only occurs when overload occurs; for example, if the chain corrodes, ruptures due to fatigue, and the wheels fall off, the left and right chains may shift after a certain period of time after a temporary light load, resulting in flight or other problems. Damage may result in overloading, by which time it will be too late.

The present invention solves this problem by providing means for remotely detecting chain overloads and light loads in a means that allows the movable bearing of the sprocket wheel to be adjusted from outside the tank. The aim is to provide the equipment.

Next, the details of the present invention will be explained in detail based on the drawings illustrating the embodiments.

In FIG. 1, reference numeral 1 denotes a casing, and a movable bearing 2 is provided inside the casing so as to be slidable in the left and right directions of tightening and loosening a chain 12, which will be described later.

Reference numeral 3 denotes a spindle fixed to the movable bearing and having an axial direction in the left-right direction, and a male threaded portion 3a is carved throughout.

On the other hand, as shown in FIGS. 2 and 3, a rotating shaft 4 for operation is suspended from outside the tanks A and B, faces into the casing 1, and has a bevel gear 5 fixed to its tip. Another bevel gear 6 engaged with this bevel gear 5 has a female threaded portion 6a formed at its center, which is meshed with the male threaded portion 3a of the spindle 3. Therefore, as the operating rotation shaft 4 rotates, 2
The rotation causes the spindle 3 to move back and forth via two bevel gears 5 and 6. That is, the movable bearing 2 moves back and forth on the guides 7, 7 provided within the casing 1.

Further, a pressure equalizing plate 9 is provided at the side end of the bevel gear 6 via a thrust metal 8, and a pressure detecting element 10 is provided in contact with the pressure equalizing plate 9. This pressure detection element 10 is a piezoelectric element using a magnetic circuit distortion method or a method that converts distortion of a resistance wire into electrical resistance, and receives the tension force of a chain 12 applied to a wheel 11 via a movable bearing 2, a spindle 3, and a bevel gear 6. This pressure is output using an electrical analog device. Sho 13
A water supply port is opened in the sealed casing 1, and the inside is filled with pressurized water. FIG. 4 shows a modification of FIG. 1, in which both ends of the lower part of the casing 1 are supported by rollers 1a from above and below, and the pressure detection element 10 is brought into contact with the ends of the casing. This is the case.

As shown in Figures 2 and 3, the device having the above structure is installed at the bottom of the sedimentation tanks A and B, and has a control panel 14 provided outside the tank.
The rotating shaft 4 is connected to the rotating shaft 4.

An operation console 16 is connected to the operation console 14 via a reducer 15.
is attached, and by manually rotating the operating handle 16, the rotating shaft 4 is rotated, and the movable bearing 2 is adjusted via the spindle 3. In FIG. 3, 17 is a torque meter, 18 is a stroke meter, 19 is an output signal cable from a pressure detection element, 20 is a control circuit, 21 is a reference voltage generation circuit, 22 is a comparison circuit, and 23 is a display device. Torque attack 17 is operated and
・It displays the rotational force when operating the chain 16, and the tension force of the chain 12 can be calculated by calculating the mechanical efficiency of the reducer 15, rotating shaft 4, spindle 3, and movable bearing 2. .

Furthermore, stroke control 18 is operated...endor 16, reducer 1
5. The number of revolutions of the bevel gears 5 and 6 and the amount of movement of the movable bearing 2 are displayed on the dial gauge in units of mm.

The electrical analog quantity, which is the output of the pressure detection element 10 that detects the thrust generated between the bevel gears 5 and 6, directly indicates the tension force in the chain 12, and if it is large compared to the reference voltage, there is an overload. If it is small, the load will be light.

For example, in the case of a light load, the display device 23 takes into consideration phenomena such as breakage due to chain corrosion and wheel derailment, so power is cut off,
Perform warning display, etc. The same applies to the reverse overload case. Furthermore, there is no chance of foreign matter getting caught in or attached to the movable bearing, spindle, bevel gear, etc. inside the casing because the inside is filled with pressurized water.

As described above, the present invention eliminates various conventional problems such as sedimentation tanks, and allows the tension of the chain to be immediately adjusted using movable bearings not only in the case of overload but also in the case of light load. , which has great effects on sewage treatment.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the device of the present invention, and FIG. 1 is a sectional view of the main part thereof, FIG. 2 is an explanatory diagram of the state of implementation, FIG. 3 is a program diagram showing the present invention, and FIG. 4 is a sectional view of a main part of another example. 1...Casing, 2...Movable bearing,
3... Spindle, 4... Rotating shaft, 5
, 6...Bevel gear, 7...Guide,
9... Pressure equalization plate, 10... Pressure detection element, 11... Sprocket wheel, 12...
...Chain.

Claims (1)

[Claims] 1 A sprocket wheel around which the chain of the scraper is wound, a bearing that supports this wheel and is movable in the direction of tightening and loosening the chain, a spindle whose movement direction is axial to move this bearing, and this spindle. a drive means actuated from outside the tank; a pressure detection element that receives the chain tension force applied to the bearing via the spindle; and a pressure detection element that compares the output signal of the pressure detection element with a reference voltage to detect tension overload or A control circuit for detecting a light load, and a chain tension detection device for a sediment scraper used in a sedimentation basin for a sewage treatment plant, etc.