JPH0748010A - Pipe conveyer - Google Patents

Abstract

PURPOSE:To facilitate the normal winding of a carrying belt round a pully even in the case where the deviation of a load and the damage of a roller occur by uniformly stretching the carrying belt on both sides in a trough conversion section without deviation toward one side. CONSTITUTION:When a pipe-shapedly rolled up carrying belt 1 arrives at a trough conversion section B, after both the side edges of a carrying belt 1 are first uniformly stretched toward both the sides of the belt 1 by a stretching roller 21, and next once bent upward by a dummy pulley 24 and flattened, the carrying belt 1 winds round the pulley 2. Thus the carrying belt 1 can be prevented from deviating toward one side and turning up at both its side edges in its winding round the pulley 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe conveyor in which a part of an endless belt-shaped conveyor belt is rolled into a pipe shape, and an object to be conveyed is wrapped in the conveyor belt.

[0002]

2. Description of the Related Art FIGS. 4 to 7 show an example of a conventional pipe conveyor.

In this conventional pipe conveyor, an endless belt-shaped conveyor belt (1) is separated from each other by a pair of front and rear pulleys.
(2) Unfold it between the (3) and flat belt and hang it around both pulleys.
(2) Any one of (3) is rotated by driving means (not shown) such as a motor so as to be circulated.

Both pulleys (2) and (3) in the conveyor belt (1)
Each intermediate portion between the forward path portion (1a) and the return path portion (1b) is fixed to the support frame (4) provided along the transport direction at a suitable interval with a large number of storages as shown in FIG. Upper chamber in form (5)
(5a) and the lower chamber (5b) are passed through a window hole (5c) formed in the center of each, and at the time of passing, a plurality of shape-retaining members arranged in a substantially annular shape at the periphery of the window hole (5c). It is rolled into a pipe by the roller (6).

As shown in FIG. 4, a portion of the conveyor belt (1) wound around one pulley (2) or (3) and developed into a flat belt until it is rolled into a pipe or into a pipe. From the rolled part to the other pulley (3) or (2)
In the trough conversion parts (A) (A ′) (B) (B ′) that are laid around and are spread into a flat belt, the conveyor belt (1) is
By a guide roller (9) such as a trough pivotally supported by a plurality of guide frames (8) fixed to a frame (7) extending in the front-rear direction from a middle portion of front and rear ends of the support frame (4) , Is gradually rolled into a pipe shape or gradually expanded into a flat belt shape.

As schematically shown in FIG. 6, the conveyor belt (1) is developed into a flat plate shape and the rear pulley (3) is rotated from below.
Envelops the transported material (11) dropped from the supply hopper (10) while passing through each guide frame (8) of the trough conversion section (A) and being gradually rolled into a pipe shape.

Then, while passing through the upper window hole (5c) of each shape-retaining frame (5) and passing through each guide frame (8) at the trough conversion part (B), it is gradually expanded into a flat belt shape. , Front pulley
When traveling around (2) from above, transport the goods (11) to the receiving hopper (1
2), then, at the trough conversion section (A ′), it is rolled again into a pipe shape, passes through the window hole (5c) at the bottom of each shape-retaining frame (5), and is further transferred to the trough conversion section (B). '), It is unfolded into a flat belt again, and then returns to the rear pulley (3) and circulates.

The above is the outline of the structure and operation of the pipe conveyor. The trough conversion section (B) of the conventional conveyor belt (1) is, as shown in FIG. 7, an expanded conveyor belt.
The central axis (CL) of the portion of the conveyor belt (1) that is rolled into a pipe shape is so that the central portion and both side edges of (1) extend evenly by the pulling force of the pulley (2) in the front portion. Pulley (2) at the front that starts contact with the extended line with the unfolded conveyor belt (1)
It is aligned with the apex (2a) of the outer circumference of the above or is located below the apex (2a) (see, for example, JP-A-63-262320).

The relationship between the rear pulley (3) and the conveyor belt (1) in the trough converting section (A) is as follows.
(B) and the front and rear have a similar relationship (not shown).
Further, the trough conversion unit (A ′) and the trough conversion unit (B ′) and the trough conversion unit (A) are vertically symmetrical (not shown).

[0010]

In the conventional pipe conveyor as described above, the conveyor belt (1) immediately after entering the trough conversion section (B) is still rolled into a pipe shape, and at that portion. Since both side edges of the conveyor belt (1) are not continuous with each other and are simply superposed,
The stresses on both edges occur independently of each other, and the stress distribution becomes non-uniform.

Therefore, even a slight twist of the conveyor belt (1) causes a difference in stress on both side edges, the expansion amount of each part is different, the gutter-shaped expansion part is inclined, and the flat-plate-shaped expansion part is expanded. There is a risk that the portion will be offset to the side at the point of contact with the pulley (2).

In order to eliminate such a fear, there is a self-aligning roller provided in the trough converting portion to prevent lateral displacement of the belt. However, the load is biased or the roller is damaged. In such a case, the belt running adjustment by the self-aligning roller does not work properly, the side edge of the conveyor belt (1) contacts the guide frame (8), etc. and is damaged or the side edge is folded back. There is a problem.

In view of the above-mentioned problems of the prior art, the present invention prevents the conveyor belt from shifting to one side in the trough conversion section even when the load shifts or the rollers are damaged. It is an object of the present invention to provide an improved pipe conveyor which is uniformly spread on both sides and is normally wound around a pulley.

[0014]

In order to achieve the above object, the present invention provides a pipe-shaped intermediate portion between both pulleys of an endless belt-shaped conveyor belt which is looped around a pair of pulleys separated from each other. In a pipe conveyor that is configured to be rolled up and wrapped to convey the conveyed goods, the trough conversion part from the portion of the conveyor belt that is rolled into a pipe shape to the one belt that is wound around to develop into a flat belt shape. A dummy pulley parallel to the one pulley is disposed near the pulley inside the conveyor belt, and both side edge portions of the conveyor belt are disposed near the pipe-shaped rounded portion of the trough conversion section. Is provided with at least one pair of expansion rollers for pushing and expanding the both sides.

In practice, the dummy pulley is mounted on a support so as to be rotatable about an axis orthogonal to the axis of the conveyor belt, and based on the operation of detection means for detecting lateral deviation of the conveyor belt. It is preferable to provide an automatic adjusting device for automatically adjusting the angle of the dummy pulley about the axis so as to correct the deviation.

[0016]

When the conveyor belt rolled into a pipe shape reaches the trough conversion section, first, both side edges of the conveyor belt are spread evenly to both sides by the expansion rollers, and then the dummy pulley temporarily moves outward (upper trough). At the converter, the conveyor belt does not shift to one side because the conveyor belt is flattened by being warped upward and downward at the trough converter below) and then wound around the pulley. Both edges will not be folded back when wrapped around the pulley.

[0017]

1 to 3 show an embodiment of the present invention. It should be noted that the same members as those of the above-described conventional device are denoted by the same reference numerals and detailed description thereof is omitted, and in the following description, only the characteristic configuration of the present invention different from the conventional configuration will be described.

In the present embodiment, the guide frame (the rightmost portion in FIG. 1 is the front) of the trailing portion closest to the pipe-shaped rounded portion of the conveyor belt (1) in the trough conversion portion (B). 8)
A roller support (20) facing in the front-rear direction is fixed to the center of the upper part of the roller, and both side edges of the developing conveyor belt (1) are gradually pushed outward on both sides of the roller support (20). Three
A pair of extension rollers (21) are provided side by side in the front-rear direction.

A shaft that rotatably supports each expansion roller (21)
(22) is fixed to the roller support (20) such that the front side has a larger left-right opening angle. In addition, each axis
Although one (22) may be fixed to the roller support (20) one by one, for example, a support shaft having the upper ends of all the shafts (22) arranged in the center of the roller support (20) and oriented in the front-rear direction. (23) is pivotally fitted, and in a state where each shaft (22) is oriented in the desired direction as described above, a nut (not shown) screwed to the support shaft (23) is tightened, and all the shafts ( It is preferable that each expansion roller (21) can be adjusted in mounting angle by fixing 22).

The frontmost guide frame in the trough conversion section (B)
A horizontal dummy pulley (24) which is substantially parallel to the pulley (2) is arranged between the pulley (2) and the pulley (2).

This dummy pulley (24) is mounted on a pulley support frame (26) having an upward U-shape with a central lower surface fixed to the upper end of a vertical rotary shaft (25) pivotally supported on the front part of the frame (7). Horizontal axis
It is pivotally supported by (27) and can be rotated integrally with the pulley support frame (26) and the rotary shaft (24) by an automatic adjusting device (27) provided on the frame (7).

The automatic adjusting device (27) is provided with a motor, a speed reducer including a worm and a worm wheel, and a control device (both not shown) inside, and the side of the conveyor belt (1) described next. The dummy pulley (24) is automatically and slightly rotated in a manner to be described later based on the operation of the detection means (32) for detecting the one-sided deviation.

Between the pulley (2) and the dummy pulley (24), there is a pair of upper and lower support plates (29) (30) sandwiching both sides of the conveyor belt (1) from above and below with an appropriate gap. The conveyor belts are arranged on the left and right sides, and on the facing surfaces of the support plates (29) and (30).
(1) A plurality of pairs of known photoelectric belt detection sensors (31) composed of a light emitting element (31a) and a light receiving element (31b) which are activated by blocking the optical path by (1) are arranged side by side in the left-right direction. ing.

The plurality of pairs of sensors (31) constitute a detection means (32) for detecting the lateral deviation of the conveyor belt (1).

That is, the left and right operating sensors (31)
It is possible to detect which side and how much the conveyor belt (1) is offset by comparing the numbers of the two.

For example, when the conveyor belt (1) is biased to the right (upper side in the drawing of FIG. 2) as shown by the phantom line in FIG. 2, among the four sensors (31) on the right side, Since three of them operate and only one of the four sensors (31) on the left operates, the conveyor belt (1) moves to the right by one sensor (31). The deviation is detected.

Based on this, the automatic adjusting device (27) positions the dummy pulley (24) in a position parallel to the pulley (2) shown by the solid line in FIG. 2 so as to correct this deviation of the conveyor belt (1). To a position indicated by the imaginary line, and rotate it slightly clockwise.

Then, the conveyor belt (1) moves the dummy pulley (2
When passing through 4), a correction force acts on the conveyor belt (1) so as to direct the traveling direction to the direction orthogonal to the central axis of the dummy pulley (24), and the conveyor belt (1) is indicated by a solid line in FIG. It is returned to the original normal state shown.

When the conveyor belt (1) is returned to its original normal state, two of the left and right four sensors (31) are detected.
The detection means (32) detects that the conveyor belt (1) has been returned to its normal state by operating individually.

Then, based on that, the automatic adjusting device (2
7) is a dummy pulley (24), and the pulley (2) shown by the solid line in FIG.
It is returned to the position parallel to and rotated, and then the conveyor belt (1)
You can drive in normal condition.

(33) is pressed from below onto the return path portion (1b) of the conveyor belt (1) between the foremost guide frame (8) and the pulley (2) in the trough conversion section (A '). It is a push-up roller mounted on the frame (7).

According to the present embodiment, when the pipe-shaped rolled conveyor belt (1) reaches the trough conversion section (B), first, both side edges of the conveyor belt (1) are moved to both sides by the expansion roller (21). Evenly, and then by the dummy pulley (24),
The conveyor belt (1) does not deviate to one side because it winds up around the pulley (2) after it has been warped upwards and flattened, and both side edges when winding around the pulley (2). Is never folded back.

If the dummy pulley (24) is provided with the automatic adjusting device (27) for automatically rotating the dummy pulley (24) in the direction to correct it according to the deviation of the conveyor belt (1), as described above,
More perfect.

Although the above description is for the trough conversion unit (B) only, the trough conversion unit as shown in FIG.
Even if (B ′) has a structure which is symmetrical with respect to the trough conversion section (B) in the front-rear direction and the up-down direction, substantially the same effect as described above can be obtained.

The above-mentioned embodiment is a pipe conveyor in which the outer surface of the one side edge portion and the inner surface of the other side edge portion are overlapped with each other and rolled into a pipe shape.
A pipe conveyor in which the inner surfaces of both side edges of the conveyor belt (1) are overlapped with each other and rolled into a pipe shape, or
The present invention can be effectively applied to a pipe conveyor in which both side edges are simply brought into contact with or brought close to each other.

Further, the expansion rollers (21) may be provided in one pair, two pairs, or four or more pairs.

[0037]

According to the present invention, the following effects can be obtained. (a) When the conveyor belt rolled into a pipe shape reaches the trough conversion section, first, both side edges of the conveyor belt are spread evenly to both sides by the expansion rollers, and then are outwardly warped by the dummy pulley. Since the belt is wound around the pulley after being flattened, the conveyor belt is not biased to one side, and both side edges are not folded back when wound around the pulley. Therefore, there is no possibility that the side edge portion of the conveyor belt may come into contact with the guide frame or be damaged.

(B) Further, the dummy pulley is mounted on the support so as to be rotatable about an axis orthogonal to the axis of the conveyor belt, and based on the operation of the detecting means for detecting the lateral deviation of the conveyor belt. Then, if an automatic adjusting device for automatically adjusting the angle around the axis of the dummy pulley to correct the deviation is provided (the invention according to claim 2), deviation of the conveyor belt should occur. Even so, there is an advantage that it can be positively corrected.

[Brief description of drawings]

FIG. 1 is a side view of an essential part of an embodiment of the present invention.

FIG. 2 is a plan view of the main part of the same.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is a schematic side view showing an example of a conventional pipe conveyor.

5 is an enlarged cross-sectional view taken along the line VV of FIG.

FIG. 6 is a schematic plan view of a rear portion of a conventional pipe conveyor.

FIG. 7 is a schematic side view of a front portion of a conventional pipe conveyor.

[Explanation of symbols]

 (1) Conveyor belt (1a) Forward part (1b) Return part (2) (3) Pulley (4) Support frame (5) Shape retention frame (5a) Upper chamber (5b) Lower chamber (5c) Window hole (6) ) Shape-maintaining roller (7) Frame (8) Guide frame (9) Guide roller (10) Supply hopper (11) Transported goods (12) Load receiving hopper (20) Roller support (21) Expansion roller (22) Shaft (23) ) Support shaft (24) Dummy pulley (25) Rotating shaft (26) Pulley support frame (27) Shaft (28) Automatic adjustment device (29) (30) Support plate (31) Sensor (31a) Light emitting element (31b) Light receiving element (32) Detecting means (33) Push-up roller (A) (A ') (B) (B') trough conversion section

Claims (2)

[Claims] 1. An endless belt-shaped conveyor belt, which is circulated around a pair of pulleys separated from each other, has an intermediate portion between both pulleys, which is rolled into a pipe shape so that an object to be conveyed is wrapped and conveyed. In the pipe conveyor, the inner side of the conveyor belt in the trough conversion part from the portion of the conveyor belt that is rolled into a pipe shape to the one pulley is laid parallel to the one pulley. The dummy pulley is arranged near the pulley, and at least one pair of expansion rollers for pushing both side edges of the conveyor belt outwardly are provided near the pipe-shaped rounded portion of the conveyor belt in the trough conversion section. A pipe conveyor characterized by that. 2. A dummy pulley is mounted on a support so as to be rotatable about an axis orthogonal to the axis of the conveyor belt, and the dummy pulley is detected based on the operation of a detector that detects lateral deviation of the conveyor belt. The pipe conveyor according to claim 1, further comprising an automatic adjustment device that automatically adjusts an angle of the dummy pulley about the axis so as to correct the deviation.