Vandezande - Automatic Trash Rack

An automatic trash rack facility consists of the following components:

• Depending on the width of the canal, 1 or more removable grid frames of stainless steel, equipped with vertical grid bars, are required. The distance between the grid bars can be selected. There is a choice between 40 mm or 100 mm. The grid frames are supported by guide rails, mounted at an angle of 75° in relation to the horizontal surface. The mechanical resistance of the grid frames with grid bars is calculated on a maximum height of the water upstream, without back pressure downstream.
• The stainless steel bucket consists of a fixed part and a hinged part. When cleaning, the fixed part of the bucket slides down the grid bars into the build-up of debris. The hinged part of the bucket is then closed, using 2 stainless steel hydraulic cylinders. The fixed part of the bucket is compatible with the distance between the grid bars for a smooth operation and intrusion. In standard versions, the width of the bucket varies between 1,200mm to 1,800mm.
• A moving trolley with support structure.

There are 3 different types :
Overhead transfer type: a moveable trolley is suspended from a monorail which is supported by a portal structure. The bucket is suspended from steel cables, wound round 2 cable drums.

Crane type: a trolley with hinged crane arms, moving on a track fitted with crane rails. The bucket is suspended from the end of the crane arms.

Hybrid type: a combination of the overhead transfer type and crane arm type: a trolley with fixed gallows, moving on a track fitted with crane rails. The bucket is suspended from steel cables, wound around 2 cable drums.

Overhead transfer:

•  A reduction motor fitted with a brake operates the 2 cable drums of the bucket, which is suspended from steel cables.
• Idlers prevent the unwanted unwinding of the steel cables.
• A hydraulic power unit feeds the hydraulic cylinders of the bucket.
• An electronically driven hose reel controls the hydraulic TWIN hose, which powers the hydraulic cylinders of the bucket.
• The moveable trolley is suspended on runners, each of them are equipped with 2 vulcanized running wheels.
• The transfer movement on the monorail of the trolley unit is operated via a reduction motor fitted with a brake.
• All necessary sensors and limit switches are provided for monitoring the operation of the equipment.
• The frame of the trolley and the machine housing are made of stainless steel. The access hatches are equipped with gas springs.
• The steel portal structure with monorail is anchored onto the adjacent concrete structure.

Crane:

• The steel crane arm consists of a main arm and a swivel arm; the bucket is hinged at the end of the swivel arm.
• Hydraulic cylinders perform the movements of the crane arm.
• A hydraulic power unit feeds the hydraulic system.
• In this setup the crane arm is moved rotationally on a turntable fitted with a ring gear.
• The rotational movement of the crane arm and the transfer movement of the trolley is driven by a reduction motor or via a hydraulic motor.
• During the transfer of the trolley all steel wheels of the trolley are powered.
• The steel track fitted with 2 crane rails is anchored onto the adjacent concrete structure.