JPH0513770Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a sliding arm type dust remover, in which the cylinder for opening and closing the rake is separated from the rake body frame, and the pressing force of the rake against the screen side when the rake is closed is reduced by its own weight. This invention relates to an overload prevention device that prevents the rake arm from being overloaded by obstacles.

[Conventional technology]

Power plants, river water intakes, water and sewage pump stations,
Automatic dust removers that remove screen residue (dust) captured by screens used in waterways of sewage treatment plants, etc. include double chain conveyor type with rake, rake winding type, pin rack type, dry chain type,
Various types such as slide arm type have been proposed and put into practical use.

A number of proposals have been made, including Japanese Utility Model Publication No. 56-34013, as a slide arm type dust remover that is equipped with a rake at the lower end and that is made extendable and retractable as a whole by inserting a plurality of support rods. Then, the inserted support rod can be expanded and contracted by winding and unwinding the wire rope, or by using the own weight of the support rod (rake arm) when extending.
When reducing the size, use wire rope winding.
Furthermore, there is a method using a hydraulic cylinder. The rake is moved up and down along the screen by expanding and contracting the supporting rods, and the entire rake frame is swung toward and away from the screen using cylinders, etc. to open and close the rake, and the combination of these two movements allows the rake to move up and down. The screen residue captured by the screen is raked up and removed.

[The problem that the idea aims to solve]

The rake frame with the rake at the bottom is swingably supported on a pedestal installed on the waterway, and the rod end of the rake opening/closing cylinder provided on this pedestal is connected with a pin to a part of the rake frame.
The rake opening/closing operation is performed by operating the rake opening/closing cylinder. Therefore, even if a foreign object gets caught in the tip of the rake, the rake frame will be strongly pressed toward the screen by the pressing force set by the rake opening/closing cylinder. This strong pressing force may cause damage to the rake, rake arm, screen, etc. due to foreign objects.

The purpose of the present invention is to eliminate the pin connection between the cylinder for opening and closing the rake and the rake frame, and to prevent overloads caused by obstacles by using only the pressing force due to the rake's own weight when the rake is closed.

[Means to solve the problem]

A rake frame having a rake arm with a rake at the lower end and a slide arm that is extendable and retractable is fixed to a swinging frame that is swingably provided on a pedestal, and the lower surface of this swinging frame is pressed against the rake frame's own weight. It is supported by the rake opening/closing cylinder so that it can be pushed up.

[Effect]

The cylinder that opens and closes the rake and the rake frame are not connected by pins, and the load of the rake frame is supported through a swing frame at the tip of the cylinder. Therefore, when the rake is closed, the cylinder is lowered so that the lower surface of the swinging frame does not come into contact with the cylinder. As a result, if an obstacle gets caught between the rake and the screen when raking with the rake, the rake is pressed against the screen only by its own weight, so if the rake rides on this obstacle, it will continue to rise, so the rake frame Since bending loads exceeding their own weight are not applied to the rake arm, rake, etc., overload can be prevented. Furthermore, damage to the rake etc. due to overload can also be prevented.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, 1 is a waterway, 2 is a screen arranged to block this waterway 1, and 3 is a pedestal installed on the waterway above the screen 2. A bearing 4 is installed on this pedestal 3, and the entire rake frame is assembled. The supporting shaft 5 is supported. One end of a swing frame 6 is pivotally supported on the support shaft 5, and a rake frame 7 is fixed to the frame 6. A slide arm 8 and a rake arm 9 are sequentially fitted into the rake frame 7 so that the entire length is extendable and retractable, and a rake 10 is provided at the lower end of the rake arm 9. Article 12
The rake arm and slide arm are expanded and contracted by winding and unwinding, and the rake 10 is raised or lowered along the screen. Reference numeral 13 denotes a rake opening/closing device installed on the pedestal 3, which uses an electric cylinder, a hydraulic cylinder, or the like. The rod tip 14 of the cylinder 13 is brought into contact with the lower surface of the opposite end of the swing frame 6 directly or with an attachment 15 provided on the swing frame. When the rod end 14 of the cylinder 13 comes into contact with the lower end surface of the swinging frame and is pushed up (see the chain line in FIG. 2), the frame 6 swings and the rake opens away from the screen. When the rake opens, the rake descends.

When a rake is used to lift screen residue, if a foreign object (obstruction) gets caught in the tip of the rake, the load on the rake frame is supported by the rake.
As the cylinder 13 descends further, the tip of the rod becomes separated from the lower surface of the swing frame. Therefore, since the descending force of the cylinder does not act on the swing frame, the rake is pressed against the screen only by the weight of the rake frame, so no overload occurs.

Further, when the rake is operating normally, a resilient stopper 16 made of rubber or the like provided on the lower surface of the swinging frame comes into contact with a portion of the pedestal 3 to prevent it from lowering further.

[Effect of idea]

According to the present invention, a swinging frame equipped with a rake frame is provided so as to be able to swing freely relative to the pedestal, and the lower surface of the swinging frame is supported by pressure applied by a cylinder for opening and closing the rake and the weight of the rake frame. Therefore, when the rake closes, the force pressing the tip of the rake toward the screen is only the weight of the rake frame, so even if an obstacle gets caught in the tip of the rake, the rake will move upwards and move over the obstacle. This has the advantage of protecting the rake from being overloaded by running over it and rising.

[Brief explanation of the drawing]

The drawings show an embodiment of the overload prevention device for the slide arm type dust remover of the present invention. Figure 1 is a front view of the entire dust remover, Figure 2 is an enlarged front view of the main parts, and Figure 3 is an enlarged front view of the main parts.
FIG. 3 is a frame, 5 is a support shaft, 6 is a swing frame, 7 is a rake frame, 8 is a slide arm, 9 is a rake frame, 10 is a rake, and 13 is a rake opening/closing device.

Claims (1)

[Scope of utility model registration request] A rake frame having a rake arm with a rake at the lower end and a slide arm that is extendable and retractable is fixed to a swinging frame that is swingably provided on a pedestal, and the lower surface of this swinging frame is pressed against the rake frame's own weight. An overload prevention device for a slide arm type dust remover that can be pushed up and supported by a rake opening/closing cylinder.