Due to its special structure, the large-incline belt conveyor occupies a small area and has a small amount of civil engineering, which can easily realize the transportation and lifting of materials. The 90°large inclination belt conveyor is a device that vertically lifts and conveys materials. Because of the limited space in the steel smelting workshop, it can economically and reliably transport the raw materials to the height specified by the process flow, so it is popular Favored by users.

1 Belt conveyor structure

The main components of the conventional 90° high inclination belt conveyor design include head and tail frame, concave-convex arc frame, intermediate frame, roller roller, pressure pulley, conveyor belt, transmission device, tension device and cleaning device. Due to the combined tension of the horizontal and vertical forces at the turning of the conveyor belt, the load is larger, second only to the combined force on the head and tail. In order to ensure the normal operation of the conveyor belt, a double pressing roller is set to change the running direction. The big wheel presses the empty edge of the base belt, and the small wheel presses on the corrugated sidewall to realize the stable conveying of materials by the hopper. On the basis of inquiring about relevant design materials and technical knowledge, combined with the on-site field survey, through many feasibility demonstrations and design discussions, it is decided to carry out structural and technological design improvements or innovations in the following ways.

2 Design improvements

2.1 The vertical section is changed to a support structure without rollers

The key technical point of the 90° high inclination belt conveyor lies in the design of the vertical lifting section. Most of the power consumption of the whole machine is located here. Reducing the resistance of the vertical section is beneficial to reducing the driving power of the whole machine. The vertical section of the conventional design adopts a frame-type support frame structure, and the upper and lower rollers, pressure rollers, anti-deflection rollers, etc. are installed on the middle support frame to ensure the stable and reliable transportation of the material carried by the sidewall belt, and the running resistance of the roller is unavoidable. The load power of the whole machine is increased, which leads to an increase in power consumption; therefore, a new design plan that does not set idler rollers in the middle vertical section is considered.

2. 2 design flange type intermediate sealing section

Because the intermediate vertical section is no longer equipped with idler rollers, the conveyor belt loses the support of the idler rollers. When the hopper of the sidewall belt carries materials upwards, under the influence of the external natural wind load, it is inevitable that the conveyor belt will swing and streamers. It is easy to cause the conveyor belt to run off, causing materials to spill, affecting the normal operation of the equipment, and the spilled materials will cause environmental pollution. After the design and discussion of the scheme, it is determined to borrow the structure form of the oppositely arranged shield and design the "concave"-shaped double flange intermediate sealing section. The advantages of this sealing section are:

(1) The existing product manufacturing process in the workshop can be used, and it can be manufactured without adding new equipment, with good versatility and easy manufacturing;

(2) The sealing section is sealed in four ways. The carrying conveyor belt realizes hermetic conveyance of materials, avoids the influence of external wind, has good environmental performance, and can prevent the conveyor belt from deviating due to external forces;

(3) For the convenience of installation and hoisting, the sealing section is designed to be 1.5m per section, and the connecting flange adopts uniform tooling and drilling, which has good interchangeability and ensures the straightness requirements after the overall assembly. The use of 3D design for modeling and drawing, and pre-assembly, greatly improve design efficiency.

2. 3 convex arc section adopts large diameter roller

The convex arc of the large inclination belt conveyor is increased due to the variable slope and bending of the conveyor belt. Generally, the spacing of the supporting rollers on the convex arc frame is usually arranged in dense layout during the design to enhance the overall carrying capacity of the roller set , Extend the replacement cycle of roller damage. But in actual use, the problem cannot be solved fundamentally. For this reason, a large-diameter roller is used at the convex arc, which has high strength after use and good effect.

In the belt conveyor, the idler roller is used to support the conveyor belt and the cargo, which can play an important role and value in the transportation, and ensure that the sag of the conveyor belt is within the design limit. In use, rollers are the most important equipment. In the design of belt conveyors, the selection and number of rollers are essential to the normal use, stable operation, maintenance costs, power consumption, and price of the belt conveyor. Have an important impact. Roller accessories can play an important role and value in the maintenance and repair of the idler, and can form the idler so that the idler can exhibit important functions and value in use.

The machining accuracy of roller accessories mainly refers to the concentricity of the inner hole of the shell and the two ends of the roller and the machining accuracy of the axial dimensions of each part. If the concentricity is too poor, it will cause the rolling bearing to seize, increase the resistance, and reduce the service life; if the axial dimension error of the parts is too large, a larger axial gap will be formed, resulting in axial movement and damage to lubrication and sealing; Poor installation quality will cause misalignment, jamming, and aggravation of wear, which will greatly reduce the service life of the roller.

How to arrange the rollers reasonably and design the appropriate roller spacing to reduce the number of rollers used, reduce the price of the whole machine, reduce investment, operation and maintenance costs, and improve economic efficiency. The processing technology of the rollers is an important aspect.

The manufacturing process of the roller accessories will affect the dynamic load of the roller. The basic reason for the dynamic load is the uneven mass of the roller shell and the mass imbalance caused by the radial runout of the shell. To ensure the quality of roller processing and assembly, the key is to find a roller manufacturer with technical strength, complete technical equipment, scientific management and good service awareness. The manufacturer should be able to provide users with design calculations, Complete technical services from roller selection, economic and technical analysis to complete machine design.

Roller accessories can play an important role and value in the use of the idler, can supplement the use and maintenance of the idler, and help users play an important role and value in the maintenance of the idler.