JPS6029525B2 - Chain tension device in sludge scraper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chain tensioning device in a sludge scraper.

A flight conveyor for sludge scraping is provided in the sedimentation tank, and the flight conveyor is constructed of a pair of endless chains placed on both sides of the sedimentation tank, and a plurality of flights installed between the pair of chains. At the time of visiting the machine, it is necessary to prevent the chain part running parallel to the bottom of the sedimentation tank, that is, the chain part used in the sludge scraping process, from becoming sagging.

For this reason, it is common practice to provide a take-up shaft equipped with a sprocket wheel at the end of the stand in the sludge scraping process so that it can move freely in the horizontal direction, and to apply tension to the chain by adjusting the movement of the take-up shaft. The conventional tensioning device for moving the take-up shaft is a manually operated scree type and has a structure in which adjustment is performed inside the sedimentation tank. Therefore, when applying tension to the chain, it is necessary to remove wastewater from the sedimentation tank. The disadvantage is that it is not possible.

In view of the above points, the present invention provides a hydraulic cylinder for moving the take-up shaft inside the sedimentation tank, and a hydraulic pump for operating the hydraulic cylinder is installed above the waste water to adjust the tension of the chain from outside the sedimentation tank. The details will be explained below based on the drawings showing one embodiment.

In the figure, 1 is a settling tank, and 2 is a flight conveyor provided inside the settling tank 1 for collecting sludge. This flight conveyor 2 has endless chains 3 provided on both sides of the sedimentation tank 1, and a plurality of flights 4 arranged at equal intervals between the chains 3. A drive shaft 5 is disposed at the bottom of the settling tank 1, and a take-up shaft 7 equipped with a sprocket wheel 6 is disposed at the other side of the bottom of the settling tank 1, that is, at the starting end of the sludge scraping process. The drive shaft 5 is the sedimentation tank 1
When the drive shaft 5 rotates, the flight 4 rotates in the direction of blindness shown in FIG. It is designed to be raised to 9.

A rectangular support frame 10 is fixed on both sides of the take-up shaft 7, and a bearing 11 is provided on the support frame 10 so as to be movable in the horizontal direction, and both ends of the take-up shaft 7 can be rotated by the bearing 11. is supported by.

A hydraulic cylinder 12 is provided at one end of the support frame 10 as shown in FIG.
is connected to the bearing 11, and a hydraulic pump 14 for operating the hydraulic cylinder 12 is installed above the waste water in the sedimentation tank 1, and this hydraulic pump 14 and the hydraulic sill 12 are connected by an oil supply pipe 15 and an oil drain pipe 16.

The bearing 11, which is moved by the hydraulic cylinder 12, is fixed at the adjusted position by a locking mechanism A provided between the support frame 10 and the bearing 11, so that it will not return even if the back pressure of the hydraulic cylinder 12 decreases. There is.

As shown in FIG. 2, the latching mechanism A is provided with a plurality of engaging protrusions 17 arranged in parallel in the moving direction of the bearing 11 on the support frame 10, and a supporting protruding piece 18 on the front surface of the bearing 11 in the moving direction. form,
The middle part of a pawl 19 is pivoted to the protrusion 18 so as to be able to swing freely, and the upper end of the pawl 19 is positioned between the engaging protrusions 17, and the lower end is brought into contact with the stopper surface 2M of the rock support 11. Something,
Since the lower end of the pawl 19 can freely swing in the direction away from the stopper surface 20, the bearing 11 can freely move to the left in FIG. 2, and the bearing 11 can move to the right in the same figure. When attempting to do so, the upper end of the pawl 19 engages with the mating protrusion 17, and the lower end of the pawl 19 abuts against the stopper surface 20'. It is held in the engaged position and prevented from moving back. The device shown in the embodiment has the above-mentioned structure, and by driving the flight conveyor 2 with the drive device 8, the sludge accumulated at the bottom of the sedimentation tank 1 is scraped up by the flights 4 moving through the scraping process A, and the sludge is collected in a sludge pool. It is discharged at 9.

When scraping sludge, tension is applied to the pair of endless chains 3, so as the work continues, the chains 3 elongate, creating a fold in the chain portion 3a of the sludge scraping process A, which removes the sludge. It becomes impossible to scrape effectively.

In such cases, it is necessary to make Chen nervous. When tensioning the chain 3, the hydraulic pump 14 is driven to move the piston rod 13 of the hydraulic cylinder 2 to the left in FIG. 2, and by moving the piston rod 13, the bearing 11 that supports the take-up shaft 7 is moves along the support frame 1 to the left in Fig. 2, so the chain 3 becomes tense.

The tension of the chain 3 can be known by looking at a hydraulic meter (not shown) connected midway through the oil supply pipe 15. By setting the oil supply pressure to the hydraulic cylinder 12 at a set pressure, the tension of the chain 3 can be adjusted to a predetermined value. The tension can be adjusted. The bearing 11 is activated by operating the hydraulic cylinder 12.
When is moved to the left side in FIG. 2, the swingable pawl 19 attached to the bearing 11 swings in the direction in which the bottom end moves away from the stopper surface 20 every time the top end collides with the engaging protrusion 17. In order to pass through the projection 17, the bearing 11 moves smoothly, and at a position where a predetermined tension is applied to the chain 3, the bearing 11 moves smoothly.
1, the lower end of the pawl 19 comes into contact with the stopper surface 20 of the bearing 11, so even if the back pressure of the hydraulic cylinder 12 decreases, the upper end of the pawl 19 engages with the protrusion 17, so the bearing 11 is held at the adjusted position, and the chain 3 can be prevented from sagging immediately after the tension is adjusted.

As described above, in the present invention, a hydraulic cylinder for moving the bearing that supports the take-up shaft is provided, and a hydraulic meter is connected to the oil supply pipe connecting the hydraulic cylinder and the hydraulic pump for operating the hydraulic cylinder disposed above the sedimentation tank. With this installed, the tension in the chain due to the movement of the bearing can be controlled remotely from above the sedimentation tank, and the tension state of the chain can be known from the outside by looking at the oil pressure meter.
The tension of the chain can be controlled to a predetermined tension.

In addition, the support frame that supports the bearing is provided with a plurality of engaging protrusions in the direction of movement of the bearing, while the bearing is free to move in the direction in which the chain is tensioned, and the bearing is not moved in the opposite direction by the engaging protrusions. Since a swingable pawl is provided, the back pressure of the hydraulic sill for bearing movement is naturally reduced, or even when the back pressure is removed, the bearing is prevented by the engagement of the mating protrusion and the pawl. Since the chain is held at an adjusted position, the tension of the chain can always be kept constant, making hydraulic control extremely easy to manage.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a sludge scraper incorporating a device according to the present invention, and FIG. 2 is an enlarged longitudinal sectional side view of the main parts of the same. 1...Sedimentation pond, 2...Flight conveyor,
7... Take-up shaft, 10... Support frame, 11... Bearing, 12... Hydraulic cylinder, 1
4... Hydraulic pump, A... Latching mechanism. Figure 1 Figure 2

Claims (1)

[Claims] 1 A flight conveyor for sludge scraping was installed in the sedimentation basin, support frames were placed on both sides of the take-up shaft of this conveyor, and the ends of the take-up shaft were supported by bearings slidably supported by the support frames. In the sludge scraper, a hydraulic cylinder for moving the bearing is provided on the support frame, a hydraulic pump for operating the hydraulic cylinder is placed above the sewage in the sedimentation tank, and a hydraulic meter is connected to the oil supply pipe extending from the hydraulic pump to the hydraulic cylinder. and the support frame is provided with a plurality of engaging protrusions in the direction of movement of the bearing, while the bearing is free to move in the direction of tensioning the chain of the flight conveyor, and the movement in the opposite direction is as described above. A tension device for a chain in a sludge scraper, characterized in that a swingable pawl is installed for blocking by engagement with an engaging protrusion.