JPH0432329Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cylindrical belt conveyor that loads and transfers powdered materials, and in particular, the invention relates to a cylindrical belt conveyor that holds a cylindrical belt in a predetermined shape. Regarding structure.

[Background Art and Problems Therein] A belt conveyor is known in which the belt has a cylindrical shape and is capable of storing and transporting powdered materials inside the belt while being separated from the outside. FIG. 2 shows a cylindrical belt conveyor with a conventional holding structure. Powder material 12 is loaded on the belt 11 at the conveyor folding part where the belt 11 is flat, and the belt 1
As the belt 1 advances, the belt 11 is made into a cylindrical shape by the rollers 13, and by moving while being guided by the rollers 13 in this state, the belt 11 transports the powdery material 12, and the belt 11 becomes flat again. Transfer to the conveyor turning section on the opposite side.

A plurality of rollers 13 are disposed on the outer circumferential side of the belt 11 at equal angles in the circumferential direction, and the belt 11 is shaped into a cylindrical shape by pressing the outer circumferential surface of these rollers 13 which are rotatably supported by the support member 14. Then,
The ears 11A and 11B near both side edges of the belt 11 overlap in the inner and outer directions.

The belt 11 is made of an elastic material such as rubber, and is pressed against the roller 13 by its own expanding elastic force. However, on the other hand, the belt 11 normally has a planar shape, and is forcibly maintained in a cylindrical shape by the rollers 13.
A restoring force is generated in A and 11B to return to the original planar shape. Therefore, as shown in FIG.
A may jump up between the two rollers 13, creating an opening in a part of the belt 11 having a circular cross section, and causing the powder 12 to spill out. This problem occurs noticeably at conveyor bends where the direction of conveyor movement changes, making it impossible to maintain the hermeticity of the belt, so the conveyor transport speed must be kept at a constant speed, and it is difficult to achieve high-speed conveyors. It was difficult.

[Purpose of the invention] The purpose of the invention is to prevent the ears near both side edges of a cylindrical belt from jumping up, thereby holding the belt in a predetermined shape, and maintaining the sealing performance of the belt with a circular cross section. Therefore, it is an object of the present invention to provide a holding structure for a cylindrical belt conveyor that can increase the belt moving speed.

[Means and effects for solving the problem] Therefore, in the configuration of the present invention, a plurality of rollers are disposed in the circumferential direction on the outer circumferential side of the belt, and these rollers move the belt around the ears near both side edges. In a cylindrical belt conveyor having a cylindrical shape that overlaps in the inner and outer directions, the rollers disposed at least in the overlapped portions of the ears are drum-shaped rollers whose diameter increases from the center to both ends, thereby producing a belt with a circular cross section. The drum-shaped roller, which has a shape corresponding to the shape of the belt, prevents the ears from jumping up and effectively holds the belt in a predetermined shape.

[Example] Fig. 1 shows a cylindrical belt conveyor to which a holding structure according to this example is applied. FIG. 1 shows the upper stage, which is the conveying side of the powder material 2, of the two upper and lower stages that are folded back at the folding parts at both ends of the conveyor, and the lower stage returns as a flat surface.

As shown in the figure, six rollers 3 are arranged on the outer circumferential side of the belt 1 on the upper stage of the conveyor, and these rollers 3
are arranged at equal angular intervals in the circumferential direction. Rollers 3 rotatably supported by a support member 4 are arranged in parallel in the longitudinal direction of the belt 1 (in the direction of the front and back of the paper in FIG. The belt 1 is formed into a cylindrical shape by these rollers 3.

In this embodiment, the three rollers 5 in the lower half of the six rollers 3 are the same as the rollers 13 shown in FIGS. 2 and 3, and are flat rollers with the same diameter continuous in the axial direction. be. On the other hand, the rollers disposed at the top of the belt, that is, the ears 1A near both side edges of the belt,
The roller 6 disposed in the portion 1C where the rollers 1B overlap in the inner and outer directions is a drum-shaped roller whose diameter expands in a curve from the center portion 6A to both end portions 6B and 6C. Further, ear portions 1A,
The rollers 7 and 8 that press the belt outer peripheral surfaces 1D and 1E near the belt 1B move from the center portions 7A and 8A to one end portion 7.
It is a lapper type roller whose diameter expands in a curve to B, 8B, and from the center part 7A, 8A to the other end part 7C, 8C.
The same diameter continues. In particular, two ears 1A,
1B, the truss-shaped roller 7 that presses the belt outer circumferential surface 1D near the outer ear 1A is disposed with its diameter-enlarged end 7B facing the drum-shaped roller 6. Belt outer peripheral surface 1 near part 1B
The trumpet-shaped roller 8 that presses the drum-shaped roller 8 is disposed so that the end portion 8B having an enlarged diameter is directed toward the side opposite to the drum-shaped roller 6.

In the above description, the shapes of the diameter changing portions of the drum-shaped roller 6 and the rattle-shaped rollers 7 and 8 are formed into an arc shape corresponding to the belt 1 having a circular cross section. Furthermore, the two ears 1A and 1B have a length that reaches the vicinity of the wrapper type rollers 7 and 8.

The belt 1 has an expanding elastic force, and the ears 1A and 1B have a restoring force that tends to return to their planar shape, so the ears 1A and 1B tend to spring up outward. However, the roller 6 disposed at the overlapping portion 1C of the ears 1A and 1B is a drum-shaped roller, and both ends 6
B and 6C protrude toward the center of the belt 1 with a circular cross section from a tangent passing through the central portion 6A. Therefore, the ears 1A, 1B are curved along the shape of the drum-shaped roller 6, and are prevented from jumping outward. Therefore, the problem is the same as the conventional one shown in FIG.
This solves the problem of the internal powder 2 spilling outside due to an opening formed in a part of the belt 1, and also prevents the outer ear 1A from jumping up. 1A does not come into contact with the roller 8 or the support member 4, and therefore the belt 1
Friction damage and shortening of the life of the belt 1 are prevented, and smooth running of the belt 1 is ensured.
In addition to the above, in this embodiment, the rollers 7 and 8 on both sides of the drum-shaped roller 6 are lapper-shaped rollers, and the diameter changes in a curved line in half from the center portions 7A and 8A, similar to the drum-shaped roller 6. Therefore, this diameter changing portion 7D,
It makes line contact with the outer circumferential surface of the belt 1 at 8D, and maintains the shape of the belt 1 in a circular cross section. In particular, of the two lapper-shaped rollers 7 and 8, the roller 7 is a single-tapered roller whose diameter changes in half in the axial direction from a central portion 7A near the drum-shaped roller 6, and at this diameter changing portion 7D. Prevents outward expansion,
As a result of this, the belt part here is pressed,
The inner ear part 1B prevents the formation of a gap between the belt 1 which is double-layered inside and outside, and ensures the airtightness of the belt 1 with a circular cross section. Further, the roller 8 is also a single tapered roller, and since the same diameter continues from the central portion 8A of the roller 8 near the drum-shaped roller 6 to the axial half thereof, the belt 1 is not pressed by this portion. Therefore, since this belt portion swells outward, airtightness is ensured between the belt portion and the ear portion 1A pressed by the drum-shaped roller 6.

Therefore, from the above, one drum-shaped roller 6
With the two lapper-type rollers 7 and 8, a long circumferentially sealed part can be provided on the belt 1, which has an inner and outer double overlapping part 1C. It is possible to reliably prevent the shaped material 2 from leaking to the outside of the belt 1.

In addition, since the half of the roller 8 in the axial direction from the center portion 8A far from the drum-shaped roller 6 is a diameter changing portion 8D, the pressing effect of the drum-shaped roller 6 is weakened on the belt portion that comes into contact with this diameter changing portion 8D. Even if the belt portion tends to bulge in the opposite direction, the outward bulge of this belt portion is prevented, and the belt 1 can be formed into a predetermined shape with a circular cross section.

Furthermore, according to the present embodiment, only one drum-shaped roller 6 and two trumpet-shaped rollers 7 and 8 are used, and the other rollers are flat rollers 5, making the processing work troublesome. The diameter changing portion, that is, the portion on the outer circumferential surface of the roller that must be finished into a curved shape corresponding to the circumferential surface shape of the belt 1 using a lathe, a grinder, etc. , 8, only half of each outer circumferential surface of
Therefore, the roller is easy to manufacture, and manufacturing costs can be kept low.

As described above, in this embodiment, the belt on the powder conveying side of the upper stage of the conveyor has a circular cross section, and the belt on the return side of the lower stage of the conveyor has a flat surface. It can also be applied to a circular case, and when the holding structure according to the present invention is applied to the lower stage of the conveyor, the part where the two ears overlap in the inner and outer directions is formed at the bottom of the belt, so the drum-shaped roller is placed on the bottom side of the belt. It will be placed in If necessary, in the present invention, the drum-shaped roller may be disposed at the overlapping portion of the ears.

[Effects of the invention] According to the invention, the ears of the belt can be prevented from jumping outward, the belt can be maintained in a predetermined shape with a circular cross section, and the sealing performance of the belt can be maintained.
There is no risk of internal powder spilling to the outside, and the belt can maintain its airtightness even at conveyor bends where the direction of conveyor movement changes.
It has the advantage of increasing the moving speed of the conveyor compared to conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a conveyor showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of a conveyor showing a conventional example,
FIG. 3 is a diagram showing problems in the conventional example. 1...belt, 1A, 1B...ears, 1C...
Overlapping portion, 1D... Belt outer circumferential surface close to outer ear 1A, 1E... Belt outer circumferential surface close to inner ear 1B, 6... Drum 1 type roller, 6A... Central portion, 6
B, 6C... End portion with enlarged diameter, 7, 8... Ratsupa type roller, 7A, 8A... Center portion, 7B, 8B
...The end with an enlarged diameter.

Claims (1)

[Scope of utility model registration request] In a cylindrical belt conveyor in which a plurality of rollers are disposed circumferentially on the outer circumferential side of the belt, and these rollers make the belt into a cylindrical shape in which ears near both side edges overlap in the inner and outer directions, the overlap of the ears is prevented. The rollers arranged in the sections are drum-shaped rollers whose diameter increases from the center to both ends, and the rollers arranged adjacent to the drum-shaped rollers and which press the outer circumferential surface of the belt near the outer ears are arranged in the center. A lapper-shaped roller whose diameter expands from the end to the end on the side of the drum-shaped roller and continues with the same diameter from the center to the other end, and is arranged adjacent to the drum-shaped roller and close to the inner ear. The roller that presses the outer peripheral surface of the belt is a lapper-type roller whose diameter increases from the center to the end opposite to the drum-shaped roller, and the same diameter continues from the center to the end on the side of the drum-shaped roller, A holding structure for a cylindrical belt conveyor, characterized in that the other rollers are flat rollers with the same continuous diameter in the axial direction.