JPS6022910A - Sludge scraping machine with detecting device of chain tension - Google Patents

Abstract

PURPOSE:To carry out easily the zero point regulation of a load detecting body by regulating simply the load of a load detecting body to zero independently of the magnitude, etc. of the initial tension of a chain only by operating a load-releasing device. CONSTITUTION:The idler sprockets 4, equipped on the rear side of sprockets 3 in the moving direction of a chain and positioned adjacently, are attached freely rotatable to one end of a vertical lever 11 which is supported freely rotatable around the horizontal axial center 10. A load cell 13 as a load detecting body for detecting the tension of the chain 7 by the press of a lever 11 is kept into contact with the side surface 12 of the lever 11 whereon the tenison of the chain is exerted. When a cylinder device 14 for releasing the load is operated, the lever 11 is exerted by the force in the direction to be removed from the load cell 13, and the tension of the chain 7 is received by the cylinder device 14. Accordingly, the load of the load cell 13 can be reduced to zero. In this way, the zero regulation of the load cell 13 can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sludge scraper having a chain tension detection device.

Some chain-type sludge scrapers are designed to detect chain tension by using a load sensor such as a load cell. FIG. 8 shows the relationship between the chain tension and the output of the load sensing body, where A shows a characteristic straight line in a normal state and B shows a characteristic straight line when an error occurs. Errors at this time include span fluctuations due to the change of the slope θ1 to θ2 and zero point fluctuations due to the zero point changing by po. When a load cell is used as a load sensing object, zero point fluctuations are particularly likely to occur due to changes in the characteristics of the load cell itself or changes in the insulation resistance of the conductor.
As shown in FIG. 8, the error due to this zero point variation tends to be considerably larger than the error due to span variation.

Therefore, it is necessary to adjust the zero point of the load sensing body from time to time to remove the negative recording error. By the way, when adjusting the zero point, the load acting on the load sensing body must be reduced to zero, but with chain-type sludge scrapers, even when the machine is not in operation, there is considerable initial tension in the chain. is added, and what's more, it's sludge.

Since the raking machine is used underwater, there is a problem in that it is difficult to reduce the load acting on the load sensing body as described above. The purpose of this invention is to easily reduce the load to zero and to easily adjust the zero point.

In order to achieve the above object, the present invention provides for a driven sprocket shaft to be attached to one end of a lever rotatably supported around a horizontal axis so as to be movable at the same time, and to be in contact with the side surface of the lever in the direction in which chain tension is applied. A load detecting body is provided in contact with the load detecting body, and a load release device is provided for applying a force in a direction away from the load detecting body to the lever to zero the load on the load detecting body.

Therefore, by simply operating the load release device, the load on the load sensing body can be easily set to zero regardless of the initial tension of the chain, and the zero point can be easily adjusted. Since the load release device only applies force to the lever, it can be operated on the water and can improve workability.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 2. In Fig. 1, (1) is a settling tank, and a sludge scraper (2) is installed along the bottom wall. This sludge scraper (2) consists of a scraper conveyor, a driving sprocket (3) and a driven sprocket (4) (5).
(6) A pair of parallel endless chains (
7) A large number of sludge scraping plates (not shown) are installed between (7). The chain (7) rotates toward a trough (8) provided at the bottom of the settling tank (1), and the sludge scraping plate collects the sludge on the bottom wall.

(9) is a sprocket of an electric motor provided on the sedimentation tank (1), and drives the drive sprocket (3).

As shown in Fig. 2, the driven sprocket (4) located adjacent to the rear side of the driving sprocket (3) in the chain traveling direction is attached to one end of a vertical lever 0υ that is rotatably supported around the horizontal axis On. It is rotatably attached to the section. Lever (side surface Q on the side where 1υ chain tension is applied)
A load cell α) as a load sensor for detecting the tension of the chain (7) when pressed by the lever (11) is in contact with the heel. , ("0 is a cylinder device as a load release device, and is configured so that it can apply a force to the lever (11) in the direction of pushing the side surface 0 and moving away from the load cell (6).

In the above, when the cylinder device [104 is activated, the lever (B) receives a force in the direction away from the load cell 0 pier, and the tension of the chain (7) is received by the cylinder device θ◆, It becomes possible to make the load on the load cell 0 hemorrhoids zero. By this, load cell 0;9
The zero point can be adjusted. Further, since the cylinder device 04 is operated by hydraulic pressure or pneumatic pressure, the operation can be performed on the water, and the workability can be improved.

FIG. 4 shows a second embodiment of the invention. Here, 00 is a wire rope as a load release device; U, which is connected to the tip of the lever θυ and can be pulled up to the water via the idle sheave O→. This makes the lever 0υ
It is possible to apply a force in the direction away from the load cell θ field.

FIG. 6 shows an eighth embodiment of the invention. Here, a cylinder f! ! (It is configured to apply force at 14.

FIG. 6 shows a fourth embodiment of the invention. In this embodiment, the cylinder assembly RQ4, the load cell 0, and the force≦are both in contact with the lever 09 portion t on the opposite side of the driven subrocket (4) across the horizontal axis θQ.

As described above, according to the present invention, simply by operating the load release device, the load on the charge detector can be easily reduced to zero regardless of the initial tension of the chain, and the zero point 5) can be easily reduced to zero. Not only can it be used for straightening, but since the load release 'Q77 only requires a force to be applied, it can be operated on the water, improving workability. can.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the entire sludge scraper, Fig. 2 is an enlarged view of the main parts in Fig. 1 showing the first embodiment of the present invention, and Fig. 8 is the relationship between chain tension and output of the load sensing body. Figure 4 showing
The figures show a second embodiment of the invention, FIG. 5 shows an eighth embodiment of the invention, and FIG. 6 shows a fourth embodiment of the invention. (4)...Driven sprocket, (7)...Chain, OI...Horizontal axis, 01)...Lever, (2)...
... Side, (1) Load cell (load sensing body), (1
4... Cylinder device (load release bag placed), 0 Dark... Wire rope (load release device) agent Yoshihiro Morimoto Figures 1 and 2 Figure 3 Figure 5 Figure 3

Claims (1)

[Claims] 1. A driven sprocket shaft is rotatably attached to one end of a lever that is rotatably supported around a horizontal axis, and a load sensing body is provided that comes into contact with the side surface of the lever in the direction in which chain tension is applied; A sludge scraping machine having a chain tension detection device, characterized in that a load release device is provided for applying a force in a direction away from the load detection body to zero the load on the load detection body.