JPH07277465A - Tension regulating device for belt for movable type conveyor - Google Patents

Abstract

PURPOSE:To always and easily stretch a long conveyance belt without increasing the height of a conveyor. CONSTITUTION:An approximately L-shaped bent running-round part 2b running toward either the front or the rear after it runs downward is arranged at a part of the inbound passage of a conveyance belt 2. The conveyance belt 2 is run around a stretch roller 16 at the tip of the bent running-round part 2b and the stretch roller 16 is drawn in the extension direction of the bent running- round part 2b, i.e., a longitudinal direction, by a drawing device 17. Thus, the bent running-round part 2b approaches the inbound passage of the conveyance belt 2 and extends approximately in parallel thereto. Even when the height of the whole of the conveyor 1 is decreased, the moving range of the stretch roller 16 is not limited, even the conveyance belt 2 of the long conveyor 1 is easily stretched and the whole of the conveyor 1 is lengthened and lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the tension of a conveyor belt in a movable conveyor.

[0002]

2. Description of the Related Art In a movable conveyor of this type, when it is used for a long period of time, a conveyor belt gradually expands to cause slack, and a drive roller slips. This phenomenon is more remarkable as the conveyor is longer.

An apparatus for solving this problem has already been provided, and FIG. 2 shows an example thereof. (1) is a mobile pipe conveyor (hereinafter simply referred to as "conveyor"). This conveyor (1)
Includes a pair of front and rear drive rollers (3) and a driven roller (4) pivotally mounted on a rectangular support frame (5) long in the front-rear direction.
By rotationally driving (3) by a driving means (not shown), the conveyor belt (2) wound between both rollers (3) and (4) is endlessly rotated and provided on the support frame (5). A belt rounding means (not shown) rounds the intermediate portion of the forward path of the conveyor belt (2) into a pipe shape (the intermediate portion of the return path may also be rounded into a pipe shape), and an object to be conveyed (not shown) therein. It is wrapped and conveyed in the direction of the arrow. The support frame (5)
The skid (6) provided at the lower end of the corner is slid so that the skid (6) can move along the ground.

Near the drive rollers (3) in the middle frame rod (5a) of the support frame (5), the drive rollers (3) are close to each other.
A pair of front and rear guide rollers (7) that are parallel to the guide belt (7) are pivotally installed, and the outer surface of a part of the return path of the conveyor belt (2) has both guide rollers.
A U-shaped bent portion (2a) is formed by being wound around in contact with (7).

A pulling roller (8) is fitted in the inner lower portion of the bent portion (2a), and a weight (10) is vertically installed at the lower end of a bearing (9) that pivotally supports the pulling roller (8). , The conveyor belt by its weight (2)
Is always properly tense.

[0006]

In the above-mentioned conventional apparatus, the conveyor belt (2) is tensioned by the downward movement of the weight (10) vertically provided just below the bent portion (2a) of the conveyor belt (2). Therefore, in order to tension the conveyor belt (2) of the long conveyor (1) having a long extension amount, it is necessary to raise the conveyor (1) accordingly.

However, if the height of the conveyor (1) of this type is increased, there is a risk that it will be pushed down by a strong wind or the like.
Since the height cannot be increased so much and the lifting range of the weight (10) is limited accordingly, the total length of the conveyor (1) must be shortened. Then, for example, when a plurality of conveyors (1) are sequentially connected and used in a vast landfill work, etc., if a single conveyor (1) has a short total length, a large number of conveyors (1) must be used. Notwithstanding, since a drive device for the drive roller (3) is required for each conveyor (1), the total equipment cost becomes high and the operation and management of the conveyor becomes troublesome. .

The present invention has been made in view of the above-mentioned problems of the conventional technique, without increasing the height of the conveyor.
It is an object of the present invention to provide a belt tension adjusting device for a movable pipe conveyor that can easily and easily tension a long conveyor belt.

[0009]

In order to achieve the above object, the present invention provides a support frame movable along the ground.
A pair of front and rear rollers are pivotally provided, and one of the rollers is rotatably driven by a driving means to endlessly rotate the conveyor belt wound between the rollers, and at least an intermediate portion of the outward path of the conveyor belt. In a mobile pipe conveyor that is rolled into a pipe and wraps and conveys an object to be conveyed, a part of the return path of the conveyor belt is directed downward by a plurality of guide rollers pivotally supported on the support frame. The tension is applied to the support frame so that the conveyor belt is movable in the front-rear direction at the tip of the flexing rounding part, and is guided to run along the approximately L-shaped flexing rounding part that goes either forward or backward. The tension is applied to the conveyor belt by wrapping it around a roller and pulling the axis of the tension roller in the extending direction of the bending traveling portion by a traction device provided on the support frame. It is.

This belt tension adjusting device of the movable pipe conveyor is provided in a connecting means for connecting the pulling device and the shaft of the tension roller, and a tension sensor for detecting the tension applied to the connecting means, the tension sensor and the pulling device. The traction device is electrically connected to the traction device so as to loosen the traction of the traction device when the tension detected by the tension sensor is large, and to operate the traction device when the tension detected by the tension sensor is small. And a control device for controlling the.

The conveyor may be a pipe conveyor in which at least an intermediate portion of the forward path of the conveyor belt is rolled into a pipe shape and the object to be conveyed is wrapped in the pipe and conveyed.

[0012]

In a part of the return path of the conveyor belt, a substantially L-shaped curved running portion is provided which is directed downwards and is directed forward or backward.
At the tip of the bending round section, the conveyor belt is wound around the tension roller, and the tension roller is pulled by the pulling device in the extending direction of the bending round section, that is, the front-back direction. Even if the height of the conveyor as a whole is made close and parallel to the return path of the belt, the moving range of the tension roller is not limited, and the conveyor belt of a long conveyor can be easily tensioned. The entire conveyor can be made long and low.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, in which the same members as those described above are designated by the same reference numerals and the description thereof is omitted.

The middle frame rod (5) of the support frame (5) of the conveyor (1)
Near the drive roller (3) in a), the conveyor belt (2)
A pair of front and rear first guide rollers (11), which are close to each other and parallel to the drive roller (3) on the return path, are pivotally provided, and are located immediately below the front first guide roller (11) and close to it. One parallel second guide roller (12) is pivotally mounted on the frame rod (5a).

A downward trapezoidal rail (14) facing the front-rear direction is laid on the upper surface of the base plate (13) installed on the lower frame rod (5b) and placed on the base plate (13). The bearing base (15) is fitted so as to be slidable back and forth and not to be pulled out upward, and the tension base (15) is parallel to the rear of the second guide roller (12) and has a uniform height. 16) is pivotally installed.

The return conveyor belt (2) has an outer surface on the front of the first guide roller (11), an inner surface on the second guide roller (12) and a tension roller (16), and an outer surface on the rear first guide. A roller L (11) is sequentially wound around the roller (11) to form a horizontal L-shaped bent running portion (2b) immediately below the frame rod (5a).

An electric traction device (1
7) is provided, and the bearing base is provided by the wire (18) that is the connecting means.
Connected to (15) and at the front of the wire (18) is a tension sensor (1
9) is provided.

Reference numeral (20) is a control device electrically connected to the tension sensor (19) and the traction device (17), and the tension detected by the tension sensor (19) is larger than a preset range. In this case, for example, the braking mechanism of the traction device (17) is loosened, or the traction device (17) is reversely operated so that the wire (18) extends to loosen the traction of the traction device (17), and Tension sensor (19)
When the tension detected by is smaller than the set range, the traction device (17) is automatically operated.

In place of the skid (6), a flat skid (21) having a spherical lower surface is provided at the lower end of the leg rod (5C) of the support frame (5) to support the support frame (5). It can be easily moved to the front, back, left and right by a bulldozer (not shown).

In the above-mentioned device of the present invention, the tension of the conveyor belt (2) is constantly detected by the tension sensor (19), and when the tension falls below the set range, the traction device (17) automatically operates and the bearing stand is moved. (1
5) is pulled toward the pulling device (17), and the conveyor belt (2) is tensioned to a predetermined value via the tension roller (16). Also, if the tension of the conveyor belt (2) exceeds the set range,
The pulling of the wire (18) by the pulling device (17) is automatically relaxed, and the conveyor belt (2) is always stably rotated with a substantially constant tension.

Although the above is a case where the conveyor is a pipe conveyor, it can be effectively applied to a flat belt conveyor.

[0022]

As described above, the apparatus of the present invention is provided with a substantially L-shaped bending running portion that faces downward and then either forward or backward in a part of the return path of the conveyor belt. Since the conveyor belt is wound around the tension roller at the tip of the belt, and the tension roller is pulled by the pulling device in the extending direction of the flexing traveling section, that is, the front-back direction, the bending traveling section approaches the return path of the conveying belt. Even if the height of the entire conveyor is reduced, the moving range of the tension roller is not limited, and the conveyor belt of a long conveyor can be easily tensioned. Can be long and low.

Therefore, various optimum conveyors can be easily manufactured according to the requirements of various places of use and purposes.

Particularly when a large number of mobile conveyors are sequentially connected and used in landfill work in a vast lowland, the height of each mobile conveyor can be reduced and the length of each mobile conveyor can be reduced. It is possible to reduce the number of units, and therefore, the number of driving devices for the conveyor belts required for each movable conveyor is reduced and the cost is low, and the operation and management of the movable conveyors are easy.

[Brief description of drawings]

FIG. 1 is a side view of a mobile pipe conveyor equipped with an embodiment of the device of the present invention.

FIG. 2 is a side view of a movable pipe conveyor provided with a conventional device.

[Explanation of symbols]

 (1) Conveyor (2) Conveyor belt (2a) Bending part (2b) Bending and running part (3) Drive roller (4) Driven roller (5) Support frame (5a) (5b) Frame rod (5c) Leg rod ( 6) Skid (7) Guide roller (8) Tension roller (9) Bearing (10) Weight (11) First guide roller (12) Second guide roller (13) Bed plate (14) Rail (15) Bearing stand (16) Tension roller (17) Traction device (18) Wire (19) Tension sensor (20) Control device (21) Skid

Claims (3)

[Claims] 1. A support frame movable along the ground,
A movable conveyor in which a pair of front and rear rollers are pivotally provided, and one of the rollers is rotationally driven by a driving means so that a conveyor belt wound between the rollers is endlessly rotated. By a plurality of guide rollers pivotally supported, a part of the return path of the conveyor belt is guided so as to run along a substantially L-shaped bent running portion that faces downward and then either forward or backward. At the tip of the running part, the conveyor belt is movably moved in the front-rear direction and wound around a tension roller mounted on a support frame, and the axis of the tension roller is pulled in the extension direction of the bending running part by a pulling device provided on the support frame. By so doing, tension is applied to the conveyor belt, which is a tension adjusting device for a belt of a movable conveyor. 2. A tension sensor that is provided in a connecting means that connects the traction device and the shaft of the tension roller and that detects the tension applied to the connecting means, and that is electrically connected to the tension sensor and the traction device. A control device for controlling the traction device so as to loosen the traction of the traction device when the detected tension is large and to operate the traction device when the tension detected by the tension sensor is small. The tension adjusting device for a belt of a movable conveyor according to claim 1. 3. The movable conveyor according to claim 1, wherein the conveyor is a pipe conveyor in which at least an intermediate portion of a forward path of the conveyor belt is rolled into a pipe shape, and an object to be conveyed is wrapped in the pipe conveyor and conveyed. Belt tension adjusting device.