Tension device is one of the main part of the belt conveyor, mainly for the normal operation of belt conveyer belt provide a certain amount of tension force, ensure the conveyer belt tension minimum tension point, the permanent elongation compensation conveyor belt. Therefore, choosing the appropriate tension device is the key to the design of belt conveyor. Tension device has three spiral, car type and vertical type, below the advantages and disadvantages of three kinds of tension device and the scope of application are introduced.
1. The tension device spiral
Screw type tension device in a tape conveyer tail wheel, through adjusting screw tail wheel displacement and tension of the conveyor belt. Generally less than 60 metres in length with smaller power belt conveyor. Pull tight schedule in the series of products are divided into two. 500, 800 mm 1% of its schedule according to the length of the belt conveyor. Role in conveyer belt in point on the tail wheel and ran away from the point of the sum of two tension, tension is the tension device.
Screw type tension device has the advantage of simple and compact structure, small occupied space. Faults cannot be automatically adjust conveyor belt tension, tension size is not easy to control, is not appropriate in setting automatic conveyor belt scale, etc. On the belt conveyor of important should not adopt spiral tension device.
2. The car type tension device
Is the car type tension device of belt conveyor tail wheel installed in the mobile car, through the reversing wheel steel rope connected mobile car and a heavy hammer, respectively, by the weight of gravity and automatic taut conveyor belt. The tension effective stroke as follows:
S = (0.01 ~ 0.017) L, S is tensioning device effective stroke (m); L is the conveyor length (m).
The practice proved: tighten the effective stroke it is advisable to take larger value. The car type tension device has a wide using range, without being limited by the length of the belt conveyor, conveyor belt tension can be automatically adjusted, structure is simple, reliable, therefore the design should be preferred.
3. Vertical tension device
Vertical tension device installed in the transmission between the roller and the tail wheel, should as far as possible near the conveyer belt tension minimum (transmission). When the belt conveyor starting, heavy hammer taut role action quick, the effect is good. Its structure is the bottom after a 90 ° redirection roller conveyor belt, then through 180 ° redirection roller installed on the frame, by hanging on the frame of heavy hammer and make the conveyer belt tension. The choice of effective stroke is the same as the car type tension device.
Vertical tension device is suitable for the car type tension device has a difficult situation. It has the advantage of using the space position, the length of the belt conveyor equipment is easy to decorate. Defect is with the redirection roller number, material is easy to fall into the conveyor belt and roller, conveyor belt and roller surface wear. Especially when transporting materials in damp or viscosity is bigger, because cleaning not net, wear phenomenon is more serious.