JPH0413247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a belt drive device for conveying powder, powder, etc. in a bucket.

[Conventional technology]

When a belt formed by integrally providing mountain-shaped protrusions on a flat belt is installed by wrapping it around a pulley, the protrusion fits into the groove of the pulley. It is necessary to tightly fit this protrusion into the pulley, so that the flat part inevitably rises from the outer circumferential surface of the pulley (for example, Japanese Utility Model Application No. 58-87710, etc.).

[Problem that the invention seeks to solve]

However, in the above-mentioned configuration, since the drive section is driven only by the frictional force caused by the contact between the protrusions and the grooves of the belt, slips are likely to occur and the transmission efficiency is low. In addition, since the flat part of the belt with the bucket attached rises as described above, it tends to swing left and right around the center V-belt part (this flat part comes into contact with the pulley and moves away from it), and comes into contact with the inner surface of the case. There is a risk of generating abnormal noise.

Alternatively, objects to be transported may easily enter the space between the belt and the outer peripheral surface of the pulley, and may accumulate in the space, causing unexpected tension on the belt and overload.

[Means for solving problems]

This invention aims to solve these technical problems, and has taken the following technical measures.

A pulley 1 formed in a cylindrical shape is rotatably mounted on a shaft 2, a groove 3 is formed in the center of the outer peripheral surface of the pulley 1 in the axial direction of the shaft 2, and a flexible flat belt 4 is formed in the inner peripheral surface of the pulley 1. , a mountain-shaped protrusion 7 which can fit into the groove 3 of the pulley 1 and whose inclined surface 5 can come into contact with the inclined surface 6 of the groove 3 is integrally formed, and the outer peripheral surface of the flat belt has this protrusion. Holding the body 7, attach the bucket 14 via the fittings 12 provided on both sides,
When the flat belt 4 is stretched so that the protrusion 7 fits into the groove 3, the joint A between the protrusion 7 and the inner peripheral surface of the flat belt is located at a non-contact position with the groove upper end B, and the flat belt 4 The end portion of the inner peripheral surface is configured to come into contact with the outer peripheral surface of the pulley 1.

[Action and effect]

After the protrusion 7 is arranged so that it can fit into the groove 3, the flat belt 4 is wound around the pulley 1 and stretched.
Then, the protrusion 7 is received by the inclined surface 6, and the joint A between the protrusion 7 and the flat belt 4 is located outside the upper end of the groove 3. Further, both ends of the flat belt 4 contact the ends of the outer peripheral surface of the pulley 1.

Therefore, the contact surface pressure between the inclined surface 5 of the protrusion 7 and the inclined surface 6 of the groove 3 can be maintained, and both ends of the flat bell and 4 contact both ends of the outer periphery of the pulley 1, so that the protrusion 7 without compromising transmission efficiency,
By making the flat belt 4 also contribute to power transmission, the transmission efficiency can be greatly improved.

Since both ends of the flat belt 4 are in contact with the outer peripheral surface of the pulley 1, the flat belt 4 is supported at three locations: the groove 3 in the center and the left and right ends.
In particular, the bucket 14, which rotates and transfers the pulley part, is prevented from swinging due to repeated lifting and contact from the outer peripheral surface of the pulley 1 on both the left and right end sides, and is easily held stable without shaking, allowing it to be used for scooping up and throwing powder and granules. can be done accurately.

Furthermore, since the flat belt 4 is easily supported stably with respect to the pulley 1, the head of the bucket belt 14 attachment tool 12 hits the outer circumferential surface of the pulley 1 due to the above-mentioned vibration of both ends of the flat belt 4, causing abnormal noise. Not often.

However, since both ends of the flat belt 4 are in contact with the outer peripheral surface of the pulley 1, this prevents the object to be scooped up and lifted by the bucket 14 from entering from the side of the pulley when it is being supplied to the vicinity of the pulley. You can do less.

〔Example〕

Hereinafter, one embodiment of the present invention will be described. The pulleys 1, 1 are formed into a cylindrical shape, and have a box-like shape having a supply port (not shown) at the bottom and a discharge port (not shown) at the top. A shaft 2 (the lower part is not shown) is rotatably mounted on the upper and lower ends of the case 8. The pulley 1 has a continuous flat-bottomed V-shaped (V-shaped) groove 3 formed on the outer peripheral surface of the shaft 2 at its center in the axial direction, and is detachably attached to the shaft 2 with a screw 9. Fixed. Further, among the shafts 2, the lower shaft can move up and down in a vertically long elongated hole (not shown) drilled into the case 8 to adjust the length between the pulleys 1, 1. It is composed of

The flat belt 4 has the same width from side to side as the width from side to side of the pulley 1, and is formed in an endless shape. The flat belt 4 has a flat portion 10 and an inclined surface 5 that can be fitted into the inclined surface 6 of the groove 3, and has a protrusion 7 etc. that projects outward from the center of the flat lower surface. It is configured. Reference numeral 11 denotes a plurality of bucket attachment holes which are bored on both left and right sides of the flat portion 10 to sandwich the protrusion 7, and a plurality of bucket attachment holes are provided at predetermined intervals in the circumferential direction of the flat belt 4. Then, the bucket belt 14 is fixed to the outer surface of the flat belt 4 with a nut 13 that inserts the bucket belt 14 into a screw 12, which has a thin and flat head that is inserted from the inside of the bucket mounting hole 11. ing. In addition, the bucket 14
The horizontal width of the pulley 1 is formed to be slightly larger than the horizontal width of the pulley 1.

Further, a core body such as a cloth is inserted into the flat portion 10 of the flat belt 4 in two layers, upper and lower, in an endless manner, and is integrally formed therewith.

When the protrusion 7 is fitted into the groove 3 of the pulley 1, the joint A between the protrusion 7 and the lower surface of the flat part 10 is between the upper part B of the groove 3 and the outward C of the pulley 1 (see Fig. 1). The base width L of the protrusion 7 is made larger than the upper end width l of the groove 3 in order to have the same width.

Next, its effect will be explained. First, the flat belt 4 to which the bucket belt 14 is attached is inserted into the groove 3.
(solid line in Figure 2). Next, with the protrusion 7 disposed in the groove 3, the lower pulley 1 is pulled downward to tension the flat belt 4.

Then, the protrusion 7 fits deeper into the groove 3,
That is, the protrusion 7 can be fitted into the groove 3 in a press-contact state by the above-mentioned tensioning, and due to the relationship between the widths L and l, the joint part A is located at a distance between the groove upper ends B and C. . Moreover, the flat belt 4 is stretched by the above-mentioned tension.
Tension is applied in the longitudinal direction (circumferential direction at the pulley 1, 1-wrap part), and in the pulley 1-wrap part, the central part is raised from the pulley 1 due to the insertion of the protrusion 7, while the left and right At both ends, strain deformation occurs due to the tension, and a portion of the end portions comes into contact with the pulley 1 (phantom lines in FIGS. 1 and 2).
Note that the head of the screw 12 also contacts the outer peripheral surface of the pulley 1.

Therefore, friction is exerted on the central portion of the flat belt 4 due to the contact between the inclined surface 5 of the protrusion 7 and the inclined surface 6 of the groove 3 of the pulley 1, and in addition, friction is exerted between the both ends of the belt and the pulley 1. Therefore, both frictional forces prevent slips between the flat belt 4 and the pulley 1, thereby improving power transmission efficiency.

Incidentally, the powder etc. supplied to the lower part of the case 8 is scooped up and raised when the bucket 14 rotates along the lower pulley part, lifted upward, and discharged from the discharge port at the upper part of the case 8. Ru. When the bucket 14 scoops up powder, etc., the outer peripheral surface of the pulley and the flat belt 4 are in contact with each other at both ends, so it is possible to prevent powder, etc. from entering between the two from the sides, and no clogging occurs. When moving the pulley 1 part, the flat belt 4 part has the protrusion 7 in the center and both ends of the flat part are fitted into or in contact with the pulley 1. This prevents the center of the protrusion 7 from wobbling, allowing the belt to run in a stable manner. 14 cases, etc. will be prevented from coming into contact with them.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view and FIG. 2 is a sectional view of a flat belt. 1 is a pulley, 2 is a shaft, 3 is a groove, 4 is a flat belt,
5 and 6 are inclined surfaces, 7 is a protrusion, 12 is a fixture, 1
4 indicates the bucket, A indicates the joint, and B indicates the upper end of the groove.

Claims (1)

[Claims] 1 A shaft 2 rotatably connects a pulley 1 formed into a cylindrical shape.
A groove 3 is formed in the center of the outer circumferential surface of the pulley 1 in the axial direction of the shaft 2, and the inner circumferential surface of the flexible flat belt 4 can be fitted into the groove 3 of the pulley 1. A mountain-shaped protrusion 7 is integrally formed so that the inclined surface 5 can come into contact with the inclined surface 6 of the groove 3, and fittings are provided on both sides of the flat belt with the protrusion 7 sandwiched therebetween. The bucket belt 14 is attached through the flat belt 4 so that the protrusion 7 fits into the groove 3.
When stretched, the joint A between the protrusion 7 and the inner circumferential surface of the flat belt is located in a non-contact position with the upper end B of the groove, and the end of the inner circumferential surface of the flat belt 4 is in contact with the outer circumferential surface of the pulley 1. Belt drive device.