screw conveyor

Axial screw conveyor

Main structure and working principle

The shaftless screw conveyor is mainly composed of a driving device, a conveyor trough, a frame, shaftless screw blades, etc. The driving device drives the shaftless spiral blades to rotate, and the slag is transported to the end discharge port through the spiral blades.

Design points of shaftless screw conveyor U-shaped section: The shape is basically the same as the LS series screw conveyor. Shaftless spiral transmission: The spiral body is a thick strip spiral, shaftless spiral, and the head is connected to the drive shaft. Structurally, there are two types of blades: single blade and double blade. In terms of material, there are two types: carbon steel and stainless steel. There are two types of pitch ratios: 1:1 and 2:3. Sliding lining plate: a working support component for the middle and tail of the shaftless spiral body, which is divided into three types of materials: high-strength engineering plastic, stainless steel, and other high materials.

1. Main structure

⑴ Drive device

The driving device is suitable for outdoor use requirements. The motor reduction device adopts a shaft mounted reducer structure, and the reduction transmission device is a combination structure of helical gears or helical gears and worm gear transmission. The gear design is in accordance with ISO, DIN or equivalent standards, with a service factor of ≥ 1.2. The output shaft of the reducer adopts a compound three lip seal to avoid oil leakage. The reducer is equipped with an automatic oil level adjustment device to ensure good lubrication of the gear transmission under any temperature change conditions. The deceleration device should be selected from low-noise, high-efficiency, and well sealed products.

The drive motor is a flange mounted asynchronous induction motor, suitable for a power supply of 380V, 3-phase, 50Hz. The motor is IP55 protected and has a speed not exceeding 1500r/min.

Horizontal shaftless spiral conveyor for slag

The feeding hopper of the shaftless screw conveyor expands upwards to accommodate the discharge of the grid cleaning machine. Except for the feeding port, all other parts are covered and sealed. The shaftless screw conveyor has excellent sealing performance to ensure that slag, water, and odors will not overflow from the casing.

⑵ Spiral body

The shaftless spiral plate has sufficient strength and stiffness.

⑶ Support frame and conveyor trough

The conveyor support frame is made of stainless steel profiles and fixed to the concrete civil foundation with stainless steel expansion bolts.

The thickness of the conveyor trough is 3.0mm, and it is made into a U-shaped section. Except for the open feeding port, the rest of the part is closed along the spiral trough with a flat cover. The conveyor trough and cover plate are all made of stainless steel material.

⑷ Lining ring

The wear-resistant lining plate or strip in the conveyor trough should be easily replaceable, made of nylon, and have a service life of at least 3 years.

The material enters from the feed inlet and gradually moves through the spiral to the outlet, completing the conveying process.

Malfunctions and Solutions of WLS Spiral Conveyor

1. Once there is a slight bending of the inner shaft or both ends of the shaft head of the WLS screw conveyor, it will cause friction between the spiral blades and the pipe wall. If not dealt with in time, it will not only burn out the reducer motor, but also produce a lot of noise. So when starting the WLS screw conveyor, if the noise is too loud, it should be stopped immediately, and then the inner shaft inside the conveyor should be removed to check whether the shaft head is bent or the shaft is bent. After calibration, it can be started and operated