JPH03232608A - Take-up of belt conveyer - Google Patents

Abstract

PURPOSE:To regulate the tension pulley position at the time of start of belt driving in a fixed range to certain belt tension work by connecting a damper to the shaft of a tension pulley in a take-up comprising a tension pulley, weight, and slap pulley. CONSTITUTION:Shock absorbers 7 of spring types or other types are connected to the bearings at both ends of the shaft 5 of a tension pulley 4. In the case of a spring type shock absorber 7, a weight (w) and a spring are adjusted so that the length of spring becomes free when the tension pulley 4 is at the specified position. This constitution allows the spring to the absorb the height of the tension pulley 4 even when lowered once or leaped up due to the reaction at the time of start of belt driving, and as a result the tension pulley 4 is always kept at a fixed position. Therefore, the tension work of the belt is certainly functioned by this constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a take-up that applies tension to a belt on the slack side of a belt conveyor.

[Conventional technology] FIG. 3 is a schematic side view of the belt conveyor.

In the belt conveyor 31, the belt l is the head pulley 32)
The arrow 3 is guided by the tail pulley 33, bend pulley 34, etc.
Proceed in the direction of 5.

A tensioning device is used to apply tension to the belt on the slack side. Using the two snap pulleys 2 and 3 as guides, the belt is moved downward and hooked onto the tension pulley 4. Although details are not shown, two bearings on both sides of the shaft 5 of the tension pulley are supported for vertical movement, and a weight device 6 is connected to the bearings. The rectangular W in the figure is a weight. The weight device applies gravity to the tension pulley via the bearing to tension the belt on the slack side. This known take-up weight tensioning device has the following drawbacks.

When the belt conveyor is started, the belt on the slack side loosens, so the tension pulley goes down, but then rebounds upwards, sometimes ending up in a position above the position before starting.

Since the belt is loose on both the tension side and the slack side, the head boot and belt may slip and cause the engine to fail to start. The tension device no longer performs its function.

The same applies when starting with a load on top.

[Problems to be Solved by the Invention] An object of the present invention is to keep the position of the tension pulley always within a certain range when the belt conveyor is started, so that the belt tensioning device can fully function.

[Means for Solving the Problems] The belt conveyor take-up of the present invention includes a tension pulley, a weight device connected to its shaft, and a weight device attached to the tension pulley for applying tension to the belt on the slack side of the belt conveyor. In a take-up consisting of two snap pulleys that guide the belt, a shock absorber was connected to the shaft of the tension pulley. The shock absorber is composed of a cylinder, a piston, a piston rod, and oil in the cylinder, and the piston has at least two holes, one of which is equipped with a one-way valve, and the other hole is equipped with the one-way valve. This is a one-way valve and a one-way valve installed in the opposite direction.

[Function] Since the shock absorber is connected to the shaft of the tension pulley, it prevents the tension pulley from falling once when the belt conveyor is started and then springing up due to the reaction, and keeps the tension pulley in a constant position at all times. Keep it in place and allow the belt tensioning device to fully function. The belt conveyor can always be started smoothly without causing belt slip.

[Example] 1 and 2 show an embodiment of the present invention.

FIG. 1 is a schematic side view of a take-up according to the present invention. The belt 1 reaches downward with two snap pulleys 2 and 3 as guides and is applied to a tension pulley 4. Two bearings on both sides of the shaft 5 of the tension pulley are supported for vertical movement, and a weight device 6 is connected to the bearings. The rectangular W in the figure is a weight. The above is a known weight type tensioning device.

In addition to this, the present invention connects the shock absorber 7 to bearings on both sides of the shaft 5 of the tension pulley, which is supported so as to be movable up and down. Usually, the bearings 8, 9 on both sides of the snap pulley 2.3 are mounted on a frame. The illustrated frame 10 is installed using a frame, and the shock absorber is fixed thereto.

Shock absorbers can be spring type, hydraulic type, etc. A spring-type shock absorber includes, for example, a cylinder 7a and a rod 7b, as shown by the arrow 7 in the figure. A spring is built inside the cylinder, and the rod is connected to the spring. The weight and spring are adjusted so that the spring has a free length when the tension pulley is in a predetermined position. The spring prevents the tension pulley from dropping once when the belt conveyor is started, and then from jumping up due to the reaction.

FIG. 2 is a diagram of a take-up hydraulic shock absorber for the belt conveyor of the present invention.

(a) is a vertical cross-sectional view of the shock absorber in the axial direction, (b)
) is an AA arrow view of (a).

Shock absorber 11 includes cylinder 12) piston 1
3. Consisting of a piston rod 14 and oil 15 in the cylinder, two holes 16 and 17 are provided in the piston, a one-way valve 18 is installed in the hole 16, and a one-way valve 19 in the opposite direction to 18 is installed in the other hole 17. Install. Arrow 20 in the figure
indicates the direction in which oil moves through the one-way valve 18, and at this time the piston moves in the opposite direction to the arrow. The weight of the weight device, the viscosity of the oil 15, the size of the hole 16, and the size of the hole 17 are set appropriately. This shock absorber may be manufactured by modifying a commercially available air cylinder.

Shock absorber 11 in Figure 1 Shock absorber 7
Set it up like this. The piston is installed so that when the tension pulley is at a predetermined position, the piston is located at approximately the middle position of the cylinder. Since there is resistance due to oil to the vertical movement of the piston, it prevents the tension pulley from lowering once when the belt conveyor is started, and then from jumping upward due to the reaction.

[Effects] The present invention uses a simple device to maintain the position of the tension pulley of the belt conveyor within a certain range at all times, thereby achieving the full effect of the belt tensioning device. To always enable smooth startup of a belt conveyor without causing belt slip.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a schematic side view of a take-up according to the present invention. Second
The figures are diagrams of a hydraulic shock absorber, in which (a) is a vertical cross-sectional view in the axial direction, and (b) is a view taken along the line A-A in (a). FIG. 3 is a schematic side view of the belt conveyor. 1 is a belt, 2.3 is a snap pulley, 8.9 is its bearing, 4 is a tension pulley, 5 is its shaft, 6 is a weight device, W is its weight, 7 is a shock absorber, 10 is a frame, 11 12 is a cylinder, 13 is a piston 14 is a piston rod, 15 is oil,
16.17 is the piston hole, 18.19 is a one-way valve. Figure 3

Claims (2)

[Claims] (1) A take-up consisting of a tension pulley for applying tension to the belt on the slack side of the belt conveyor, a weight device connected to its shaft, and two snap pulleys that guide the belt to the tension pulley, A belt conveyor take-up characterized by a shock absorber connected to the tension pulley shaft. (2) A take-up shock absorber for a belt conveyor according to claim (1) is composed of a cylinder, a piston, a piston rod, and oil in the cylinder, and further includes at least two holes in the piston and one hole. A take-up belt conveyor characterized in that a one-way valve is attached to one hole, and a one-way valve in the opposite direction to the one-way valve is attached to one other hole.