JP2000289829A - Tension application device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change tension continuously finely and in the wide range by constituting a tension application device of a sprocket for being laid with an endless chain, a driven shaft projecting both sides from the center of the sprocket, and a pair of spring coils applying tension to the driven shaft. SOLUTION: An endless chain 6 is laid over an upper sprocket and a lower sprocket 4a, and accompanying rotation of the upper sprocket by a motor with reduction gear, it is rotated up and down. Namely, the lower sprocket 4a is hung from the upper sprocket and rotated by the endless chain 6. The lower sprocket 4a is provided with a driven shaft 3 projecting both sides. Spring supporting bars are fitted with spring coils 11 from the outside, and the extreme end sides are inserted into hollow tension regulating screws 12. In the spring coil 11, the lower end is brought in contact with one spring receiver 10 integrated with the spring supporting bar, and the upper end is brought in contact with the other spring receiver 17 integrated with the tension regulating screw 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a tension applying device. More specifically, the present invention relates to a tension applying device suitable for a device that needs to apply tension such as a bucket elevator and a bucket elevator having the tension applying device.

[0002]

2. Description of the Related Art A bucket elevator is an apparatus for continuously transporting a solid such as a powder from a low place to a high place. In the structure, as shown in FIG. 3, a number of buckets 7 are attached to an endless chain 6 suspended on a pair of upper and lower sprockets 4b and 4a, and the upper sprocket is driven and rotated by a motor with a reduction gear. As a result, the endless chain rotates. The shaft of the lower sprocket is not fixed but free in the vertical direction, and tension is applied downward to prevent the chain from loosening. The bucket into which the transported object is inserted from the lower input port is turned over when reaching the uppermost portion, and discharges the transported object from the discharge port.

The reason that the lower sprocket shaft is free is that
When fixed, for example, in the case of transportation of ash generated in incinerators,
This is because the chain is stretched and loosened by the heat of the incinerator, and the chain is easily detached from the sprocket.
By making the lower sprocket shaft free in the vertical direction, the expansion and contraction and vibration of the chain are absorbed. However, if the chain is completely free, the sprocket will touch up and down and the chain will easily come off, so tension is applied downward to prevent slack. Conventionally, as means for applying tension to the lower sprocket, a tension is adjusted by applying a lever to both ends of the lower sprocket shaft and placing a weight on one end of the lever.

However, in such a method, it is difficult to adjust the tension, it is difficult to continuously change the magnitude of the tension, it is difficult to balance the left and right tensions, and even if the left and right weights are equal, the shaft is not easily adjusted. There are drawbacks such as difficulty in horizontal adjustment, and the provision of levers at both ends of the lower sprocket shaft, resulting in an increase in installation area, resulting in a decrease in passages and work area, which causes safety problems.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact tension applying device which can easily adjust the tension and can continuously change its size. It is another object of the present invention to provide a bucket elevator equipped with such a tensioning device.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a sprocket for suspending an endless chain, a driven shaft protruding from the center of the sprocket on both sides, and a pair of spring means for applying tension to the driven shaft. And a pair of upper and lower sprockets, an endless chain to which a number of buckets suspended on the sprocket are attached, and driving means for an upper sprocket, and tension is applied to the endless chain by the tension applying device. And a bucket elevator.

In a preferred embodiment of the tensioning device,
The spring means includes a hollow screw having one spring receiver, a spring support rod having the other spring receiver, and a spring coil sandwiched between the two spring receivers, and the spring support rod externally fits the spring coil. In addition, the tip side is inserted into the hollow screw and connected to the driven shaft via the bearing, and the stress of the spring coil caused by the change in the interval between the two spring bearings due to the rotation of the hollow screw causes the spring support rod, the bearing, and the driven shaft to rotate. And a sprocket to transmit the tension to the endless chain to add tension.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 3 is a diagram illustrating a bucket elevator. The endless chain 6 is suspended by upper and lower sprockets 4b and 4a, and the upper sprocket 4b is rotated by a motor with a reduction gear. Endless chain has many buckets 7
Is attached, and the transported object is put into the bucket from the lower input port. The bucket moves upward according to the rotation of the endless chain, and turns over at the top to discharge the transported object from the discharge port.

FIG. 1 shows a tension applying device according to the present invention applied to a bucket elevator. Reference numeral 1 denotes a bucket elevator main body, and a bucket 7 is attached to an endless chain 6. The endless chain 6 is suspended by upper and lower sprockets 4b and 4a, and rotates up and down with rotation of the upper sprocket 4b by a motor with a reduction gear. . That is, the lower sprocket 4a is suspended from the upper sprocket 4b by the endless chain and rotates. The lower sprocket 4a has a driven shaft 3 protruding on both sides thereof, and the driven shaft 3 is supported by a bearing 8 fitted in the guide rail 2 so as to be slidable up and down. Bearing 8
On the upper side, a support fitting 9 is attached, on which a spring support rod 18 is fixed.

As shown in FIG. 2, the spring support rod 18 has the outer periphery of the spring coil 11, and the distal end thereof is inserted into the hollow tension adjusting screw 12. The spring coil 11 has a lower end on one spring receiver 10 integrated with a spring support rod 18 and an upper end on a tension adjusting screw 1.
2 is in contact with the other spring receiver 17 integrated therewith. The tension adjusting screw 12 is supported by a screw receiving seat 15 fixed to a bracket 16 and a lock nut 13. If the screw portion is protected by a bellows or the like, entry of foreign matter can be prevented.

Reference numeral 5 denotes a slide plate with a packing case for preventing a transported object such as powder from scattering outside the bucket elevator. Reference numeral 14 denotes a scale plate for reading the interval between the upper and lower spring receivers and checking the tension.

When the tension adjusting screw 12 is rotated, the spring receiver 17 moves up and down in response thereto, and the stress generated by the distortion of the spring coil 11 sandwiched between both spring receivers 17 and 10 causes the spring support rod 18, bearing 8, The power is transmitted to the sprocket 4 a via the driven shaft 3, and tension is applied to the endless chain 6. Reference numeral 14 denotes a tension indicating scale plate, which can be used as an index of the tension applied to the endless chain by measuring the interval between both spring receivers.

[0013]

Since the tension applying device of the present invention has such a structure, it has the following effects. Since the tension is adjusted by changing the distortion of the spring with the screw,
The tension can be changed finely and continuously over a wide range, and it is easy to adjust the balance between the left and right tensions. Therefore, horizontal adjustment of the shaft is possible, and as a result, the running of the chain is stabilized, and when used in a bucket elevator, the endless conveyor chain can be prevented from hitting the exterior of the elevator, and the vibration and noise of the bucket elevator itself can be prevented. Decrease. Further, the floating of the driven shaft can be buffered by the spring effect. Further, the structure is simple, the installation space is small, the passage and the working space can be sufficiently secured by the spring mechanism, and it is preferable in terms of safety.

The tension applying device of the present invention is suitable for use in bucket elevators, but is not limited to this, and can be applied to other devices requiring additional tension. The tension can be applied not only in the vertical direction but also in the horizontal direction and other arbitrary directions.

[Brief description of the drawings]

FIG. 1 is a bucket elevator tension applying device according to the present invention.

FIG. 2 is a sectional view around a spring support rod.

FIG. 3 is a diagram showing a bucket elevator.

[Explanation of symbols]

 Reference Signs List 1 bucket elevator main body 3 driven shaft 4a lower sprocket 4b upper sprocket 6 endless chain 7 bucket 10 lower spring receiver 11 spring coil 12 tension adjustment screw 14 tension display scale plate 17 lower spring receiver 18 spring support rod

Claims (4)

[Claims] 1. A tensioning device comprising a sprocket for suspending an endless chain, a driven shaft protruding on both sides from the center of the sprocket, and a pair of spring means for applying tension to the driven shaft. 2. The spring means comprises a hollow screw having one spring receiver, a spring support rod having the other spring receiver, and a spring coil sandwiched between the two spring receivers. The coil is externally fitted and the distal end side is inserted into the hollow screw and is connected to the driven shaft via a bearing. The rotation of the hollow screw causes the stress of the spring coil caused by a change in the interval between the two spring receivers, and the spring support rod The tension applying device according to claim 1, wherein the tension is transmitted by transmitting the tension to the endless chain via a bearing, a driven shaft, and a sprocket. 3. The tension applying device according to claim 1, which is used for a bucket elevator. 4. An endless chain having a pair of upper and lower sprockets, a plurality of buckets mounted on the sprockets, and driving means for an upper sprocket.
A bucket elevator, wherein a tension is applied to the endless chain by the tension applying device according to claim 3.