JPS5835290Y2 - Sludge scraper chain slack detection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a chain slack detection device for a sludge scraper, and its purpose is to quickly detect abnormal situations such as excessive slack or breakage of the endless chain that transports the sludge scraper. do.

An embodiment of the present invention will be described below based on the drawings.

1 is a settling tank, and a sludge scraper 2 is installed along the bottom wall.

This sludge scraping machine 2 consists of a scraper conveyor, and a large number of sludge scraping plates 8 are attached between a pair of parallel endless chains 7 hung from a driving sprocket 3 and driven sprockets (4, 5, 6). The endless chain 7 rotates toward the trough 9 provided on the bottom wall of the settling tank 1 in the direction (arrow A) in which the sludge scraping plate 8 scrapes the sludge on the bottom wall.

Reference numeral 10 denotes an electric motor installed on the side wall of the sedimentation tank 1, which drives the drive sprocket 3.

11 is a chain slack detection device for detecting excessive downward descent of the endless chain 7;
It is located near the front side in the chain traveling direction and inside the moving path of the endless chain 7.

Note that 12 is a take-up for adjusting the tension of the endless chain 7, and 13 is a notification device installed in a monitoring room or the like to indicate and warn the degree of slack in the endless chain 7 based on a signal from the chain slack detection device 11. .

FIG. 2 shows the chain slack detection device 11,
Reference numeral 14 denotes a horizontal shaft rotatably supported by a bracket 16 fixed to the lower surface of the rail 15 that supports the sludge scraping board 8, and the horizontal shaft 14 has a first arm 1 at one end.
7 and one end of a second arm 18 are fixed to the other end, respectively, and these first and second arms 17 and 18 extend along the radial direction of the horizontal axis 14. .

A shaft-shaped protrusion 19 parallel to the horizontal shaft 14 is protruded from the other end of the first arm 17, and a flanged roller that comes into contact with the lower surface of the endless chain 7 is attached to the shaft-shaped protrusion 19. 2
0 is rotatably fitted on the outside.

The second arm 18 is provided with the other end of the first arm 17 upwardly biased to the flanged roller 2.
A weight body 21 as a biasing means for pressing the endless chain 7 against the lower surface of the endless chain 7 is attached by a bolt 22, and a magnetic plate 23 is fixed to the intermediate portion thereof.

A plurality of bolt holes 24 for attaching the weight body 21 are bored at appropriate intervals in the longitudinal direction at the other end of the second arm]8, so that the attachment position of the weight body 21 can be changed. It is configured as follows.

25 is a proximity switch mounting bracket fixed to the lower surface of the rail 15, and the proximity switch mounting bracket 25 has the second arm 18 connected to the horizontal shaft 14.
A plurality of proximity switches 26a to 26d are installed at appropriate intervals along the movement path of the magnetic plate 23 when it rotates around the axis.

Stoppers 27 and 28 are fixed to the bracket 16 and are in contact with the second arm 18 to restrict its rotation range.

As shown in the figure, when the second arm 18 is in contact with the stopper 27, that is, when the flanged roller 20 has rotated to the uppermost position, the magnetic plate 23 is connected to the proximity switch 27 located at the lowermost position. facing a, and also the second
When the arm 18 is in contact with the stopper 28, that is, when the flanged roller 20 has rotated to the lowest position, the magnetic plate 23 faces the uppermost proximity switch 26d.

The first arm 17, the second arm 18, the shaft-like projection 19, the flanged roller 20, and the magnetic plate 23 constitute a lever 29, and the proximity switch 2
A plurality of detection means for detecting the lever 29 are constituted by 6a to 26d.

Next, the operation will be explained.

As shown in FIG. 3, the endless chain 7 causes a large deflection immediately after separating from the drive sprocket 3, and the rail 15
The sludge scraping plate 8 supported by the sludge scraping plate 8 is held as a support point, and the amount of deflection thereof decreases as it approaches the driven sprocket 4.

When the sludge scraper 2 is operated, the pins and bushes of the endless chain 7 gradually wear out and elongate.

For this reason, the endless chain 7 gradually loosens, and the amount of deflection increases.

When the slack in the endless chain 7 is normal, the endless chain 7
is not in contact with the flanged roller 20, and the lever 29 is prevented from rotating by the stopper 27.

In this state, the magnetic plate 23 faces the lowest proximity switch 26a, and
a operates and sends a signal to the notification device 13.

With this signal, the notification device 13 indicates that the slack in the endless chain 7 is normal.

When the endless chain 7 becomes slack and its deflection increases,
The endless chain 7 comes into contact with the flanged roller 20, and the lever 2
9 is unable to rotate against the biasing force of the weight body 21.

The rotation angle of this lever 29 corresponds to the amount of deflection of the endless chain 7, and when the endless chain 7 has slackened beyond the allowable range as shown by the two-dot chain line in the figure, the lever 29
is prevented from further rotation by the stopper 28.

At this time, the magnetic plate 23 faces the proximity switch 26 d located at the uppermost position, and the proximity switch 26 d operates to send a signal to the notification device 13 .

In response to this signal, the notification device 13 uses an indicator light or a buzzer to notify that the slackness of the endless chain 7 has exceeded the allowable range.

Even before the slack of the endless chain 7 exceeds the allowable range, the lever 29 rotates according to the amount of slack of the endless chain 7, and the proximity switch 26b or 26C facing the magnetic plate 23 operates to activate the notification device. Send a signal to 13.

Based on this signal, the notification device 13 displays the degree of slack in the endless chain 7.

In addition, the proximity switches 26 a to 26 d are arranged so that when the magnetic plate 23 is located exactly in the center of the adjacent proximity switches 26 a to 26 d, both proximity switches 263 to 26
d is arranged to operate.

In this way, excessive slack in the endless chain 7 can be automatically detected, thereby preventing inconveniences such as the endless chain 7 falling off from the drive sprocket 3, or uneven contact or wear of the endless chain 7 against the teeth of the drive sprocket 3. This phenomenon can be avoided.

Furthermore, breakage of the endless chain 7 can also be detected in the same manner.

Further, since a plurality of proximity switches 26a to 26d are provided along the moving path of the magnetic plate 23, the degree of slack in the endless chain 7 can be known before it exceeds the allowable range.

Furthermore, as in this embodiment, if the slack in the endless chain 7 is detected near the front side of the driving sprocket 3 in the chain traveling direction, the amount of slack in the endless chain 7 is the largest, and moreover, Since there is no vibration of the endless chain 7 as shown in the figure, the slack of the endless chain 7 can be detected accurately.

Further, as in this embodiment, if a plurality of bolt holes 24 for attaching the weight body 21 to the second arm 18 are provided along the longitudinal direction, the endless chain 7 can be moved by changing the attachment position of the weight body 21. The biasing force can be changed depending on the weight of the

In the above embodiment, an example was described in which the weight body 21 was used as a biasing means for biasing one end of the lever 29 toward the endless chain 7, but a spring or the like may be used instead of the weight body 21. good.

As explained above, according to the chain slack detection device for a sludge scraper according to the present invention, abnormal situations such as excessive slack or breakage of the endless chain for transporting the sludge scraper plate can be automatically and quickly detected. It is possible.

Furthermore, since a plurality of detection means for detecting the lever are provided along the rotation path of the lever, it is possible to know the degree of slack in the endless chain before it exceeds an allowable range.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a sectional view of a settling tank equipped with a sludge scraper, Fig. 2 is a side view of a chain slack detection device, and Fig. 3 is an operation of the chain slack detection device. It is an explanatory diagram. 2... Sludge scraping machine, 7... Endless chain, 8... Sludge scraping machine, 11... Chain slack detection device, 14... ...Horizontal axis, 17...
...First arm, 18...Second arm, 21...Female body, 23...Magnetic plate, 2
6 a~26 d...Proximity switch, 29...
····lever

Claims (1)

[Scope of utility model registration request] A lever is provided on an endless chain that is rotatable around a horizontal axis and has one end that can be contacted from inside the movement path, and one end of the lever is attached toward the endless chain. 1. A chain slack detection device for a sludge scraper, characterized in that a biasing means for biasing the lever is provided, and a plurality of detection means for detecting the lever are provided along a rotation path of the lever.