Design rules and instructions for belt conveyor transfer chute

The transfer chute is the throat of the belt conveyor system. The unreasonable design of the chute often causes material blockage, dust pollution, serious chute wear, serious wear of the receiving conveyor belt, material particle wear, and impact damage to the receiving conveyor belt. , deviation, etc. The continuous model method is used to study the design method of the transfer chute. Under the assumption of constant material flow, to determine the material flow velocity after the material hits the impact plate requires complex iterative calculation and poor accuracy. The continuous model method and D are compared with the experimental method to verify the correctness of the model calculation method, but the scale of the experiment is complicated. Why does the belt conveyor deviate? How to deal with

The issues that need to be considered in the transfer design mainly include: the collection and distribution of materials; the control of the path of the material flow to produce the least impact, wear, material scattering and dust phenomena; Avoid the deterioration of conveyed materials

(referring to the crushing of materials or mixing of other types of materials, resulting in the decline of product quality and the reduction of block size); ensure that the materials are unloaded to the center of the belt conveyor, and the running direction of the belt conveyor is the same and has a similar speed; Ensure that the material flow is continuous and not blocked in the chute; control the transfer speed to slow down the generation of dust; the volume of the transfer chute can meet normal work, including full-load start-up and shutdown.

The design of the transfer chute, involving chute design, material flow trajectory, material escape, design examples, control of material degradation, lining plate selection and chute problems, etc. . One of the research series on the design and calculation method of the transfer chute of the belt conveyor, which mainly involves the concept of the transfer chute and its application.

The transfer chute involves the transfer between conveyors, the stacking, taking and process requirements of bulk materials, etc. The six design principles of the transfer chute:

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1. Avoid blocking at the impact point

It is required that there should be enough distance between the discharge drum and the impact point of the chute, so as to prevent the material from rebounding after hitting the chute and causing the material to move upward. for

65°～70°, the design specification is more than 55°.

2. Ensure sufficient cross-section. Generally, the cross-section of the blanking pipe is required to be 3 to 4 of the cross-section occupied by the transferred material.

times. There is a pair of contradictions here: the larger the cross-section, the smoother the flow of material, and the less likely to cause material blockage; and the excessively large cross-section will cause the material flow to diverge and cause greater dust problems, which needs to be compromised. Scope of application of belt conveyor, and equipment introduction

3. Control particle flow

Controlling the material flow is relatively concentrated. Generally, the material is required to fall vertically after passing through the upper deflector, and ensure that the material is fed to the receiving loading conveyor to deal with the middle feeding, so as to avoid the deviation of the conveyor belt and the problem of material scattering caused by the eccentric load of the material .

4. Minimize the friction on the surface of the chute

In order to ensure smooth material flow, the surface of the chute is generally required to be smooth. Because the material will wear the liner when it passes through the chute, and the surface of the liner will become smooth after friction, so some designs require the liner to be polished before installation to ensure that the friction between the newly installed liner and the material remains unchanged. .

5. Control dust generation

Dust control is mainly to keep the material in contact with the surface of the chute, so that the material flow is concentrated and a small impact angle is ensured. When the material passes through the chute, try to maintain a stable speed, and when the material is fed to the receiving loading conveyor, it is consistent with the running direction of the conveyor belt. , the speed is close to the belt speed.

6. Control material degradation For materials that are easy to be broken, it is necessary to control the speed of material flow to minimize the collision between materials.

Types of transfer chute

There are many kinds of transfer materials, including conveying very fine alumina powder, large or poor lumps Large raw ores, grains with good fluidity, sticky and wet materials with poor fluidity, iron, copper ores and pellets with strong abrasiveness, etc. Different types of materials and different process conditions require different structural forms of transfer chutes, such as complex chutes during batching, silos, hopper stacking chutes, sampling chutes installed with samplers, chutes on unloading trucks, and under the bar sieve. The stacker and reclaimer, the bifurcated chute, the chute that feeds the vibrating feeder, the apron feeder, etc.

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