JPS5837442Y2 - Sludge scraper chain tension measuring device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a chain tension measuring device for a sludge scraper.

As shown in FIG. 1, the conventional chain tension measuring device for a sludge scraper has a drive sprocket attached to one end of a lever 2 that is rotatable around the axis of a horizontal shaft 1 and located along the horizontal direction. A driven sprocket shaft 3 located adjacent to the rear side of the shaft in the chain traveling direction is rotatably mounted, and the lever 2
A load cell 4 abuts against the side surface of the lever 2 in the chain tension action direction, and a push bolt 5 that presses the rear side surface of the lever 2 in the chain tension action direction.

Note that 6 is a chain, 7 is a driven sprocket, and 8.9 is a bracket.

Now, assuming that the tip of the push bolt 5 is not in contact with the side surface of the lever 2, the chain 6 has a driven sprocket shaft 3.
, the driven sprocket 7, and the lever 2, the output of the load cell 4 becomes 0 until the tension of the chain 6 exceeds the above weight, as shown by the broken line A in Fig. 5, and the chain tension cannot be measured in this range. Can not do it.

Therefore, in the conventional device described above, a force is applied to cancel the weight by pressing the lever 2 toward the load cell 4 with the push bolt 5, but in this method, when the chain tension exceeds a certain level, the push bolt Since the tip of the lever 5 separates from the side of the lever 2, the weight is applied to the chain 6 from this point on, and the output of the load cell 4 changes as shown by the dashed line in FIG. 5, and the chain tension and load cell output change. There was a problem that the chain tension was not proportional and therefore the chain tension could not be measured accurately.

Further, there was also the problem that adjustment of the push bolt 5 was delicate and difficult, and the position of the push bolt 5 was likely to change during operation of the sludge scraper.

Furthermore, instead of using the push bolt 5, it has been proposed to attach a balance weight to the lever 2, but this has the drawback that the balance weight usually requires a weight of 500 kg or more, and the manufacturing cost is high. Ta.

In view of the above points, the present invention provides a chain tension measuring device for a sludge scraper that can accurately detect chain tension, omit adjustment work, and has a simple configuration and can be manufactured at low cost. An embodiment will be described based on the drawings.

In FIG. 2, 10 is a settling tank, and a sludge scraper 11 is installed along the bottom wall.

This sludge scraper 11 consists of a scraper conveyor, and has a driving sprocket 12 and a driven sprocket l-13,1.
A pair of parallel endless chains 1 hanging from 4 and 15
A large number of sludge scraping plates 17 are attached between the sludge scraping plates 17, and the chain 16 moves toward a trough 18 provided on the bottom wall of the sedimentation tank 10, so that the sludge scraping plates 17 scrape the sludge on the bottom wall. Rotate in the direction (arrow A).

19 is an electric motor installed on the side wall of the sedimentation tank 10;
The drive sprocket 12 is driven.

20 is a take-up for adjusting the tension of the chain 16.

As shown in detail in FIGS. 3 and 4, the driven sprocket 15 located adjacent to the drive sprocket 12 on the rear side in the chain traveling direction has a small diameter portion 21 a at one end formed by a through hole at one end of the lever 22. 22a is externally fitted and fixed to the driven sprocket shaft 21 which is rotatably fitted into the shaft 22a.

The other end of the lever 22 is rotatably fitted via a sleeve 25 onto a horizontal shaft 24, on which a threaded portion 24a at one end is screwed into a bracket 23 attached to the side wall of the sedimentation tank 10. It is prevented from being removed from the horizontal shaft 24 by a stop plate 26 and a bolt 27.

This lever 22 is located along the vertical direction, and a load cell 28 fixed to the flange 23a of the bracket 23 is in contact with the front side surface in the direction in which the chain tension is applied.

Further, on the rear side surface of the lever 22 in the direction in which the chain tension is applied, there is a flange 23 b that is different from the flange 23 a.
The tip of a bolt 30 that is threaded through the nut 29 is in contact with the nut 29.

The chain 16 is measured using the chain tension measuring device configured as described above.
When measuring the tension of driven sprocket 15, driven sprocket shaft 21 ., since lever 22 is located along the vertical direction. and the weight of the lever 22 is
It doesn't happen.

Therefore, as shown by the solid line 11 in FIG. 4, the load cell output is proportional to the chain tension, and the chain tension can be measured accurately.

Further, since there is no need to provide push bolts or balance weights, there is no need for troublesome adjustment work of push bolts, and the structure is simple and can be manufactured at low cost.

Furthermore, as in this embodiment, if a pole 30 is provided that contacts the rear side surface of the lever 22 in the direction in which the chain tension is applied, it is possible to prevent the lever 22 from swinging due to vibrations of the chain 16. Chain tension can be measured more accurately even when the chain tension is small.

In addition, by providing the horizontal axis 24 slightly closer to the load cell 28 (on the right side in FIG. 4) than in the above embodiment, the fifth
As shown by the two-dot chain line 2 in the figure, it is also possible to obtain a positive output from the load cell 28 when the chain tension is O.

In the above embodiment, an example was explained in which the driven sprocket shaft 21 was located vertically below the horizontal shaft 24, but the driven sprocket shaft 21 was located below the horizontal shaft 24.
It may also be configured to be located above 4 in the vertical direction.

Further, in the above embodiment, an example was explained in which the chain tension is measured by supporting the driven sprocket shaft 21 with the lever 22, but when the chain tension is measured by supporting the driven sprocket shaft 21 with the lever 22,
It goes without saying that chain tension can be similarly measured when the driven sprocket shaft is supported by the lever 22.

As explained above, according to the chain tension measuring device for a sludge scraper according to the present invention, chain tension can be accurately measured.

Further, since there is no need to provide a device for canceling out the weight of the chain tension measuring device applied to the chain, troublesome adjustment work can be omitted, and the structure can be simple and manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional device, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a sectional view of a sedimentation tank equipped with a sludge scraper, and Fig. 3 shows the chain tension. FIG. 4 is a side view of the measuring device, FIG. 4 is a front view thereof, and FIG. 5 is an explanatory diagram of the relationship between chain tension and load cell output of the conventional device and the chain tension measuring device according to the present invention. 11...Sludge scraping machine, 13-15...
Driven sprocket, 16...Chain, 21.
...Driven sprocket shaft, 22...Lever, 24...Horizontal axis, 28...Load cell.

Claims (1)

[Scope of utility model registration request] A driven sprocket shaft is rotatably attached to one end of a lever that is rotatably supported around a horizontal axis and located along a vertical direction, and a load cell is provided in contact with the side surface of the lever in the direction in which chain tension is applied. A chain tension measuring device for a sludge scraper, characterized by the following: