JPH0733166B2 - Torsion detector for pipe conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention wraps an endless belt between a pair of rollers and rolls the belt in a pipe shape between the rollers. The present invention relates to a twist detecting device for a pipe-shaped outward transport belt in a pipe conveyor.

This detection device can be used together with a twist correction device for the conveyor belt.

(Prior Art) FIGS. 5 and 6 show a general pipe conveyor.
The portion that is wound around the upper drive roller (2) and the lower driven roller (3) is spread in a belt shape of the conveyor belt (1) and rotates.

The conveyor belt (1) runs along the driven roller (3) from below, and immediately before being rolled into a pipe shape by a rounding roller (not shown), the transported object (dropped from the hopper (4) ( 5) Rolled outward belt (1A) that wraps around 5)
Is guided by a plurality of shape-retaining rollers (8) surrounding a circular hole (7) in the upper portion of the shape-retaining frame (6) and advances, and the shape-retaining is released and spreads into a belt shape, and then the drive roller (2). ) Is loaded into the load receiving hopper (9) surrounding the object (5).

The return belt (1B), which has been swung around the drive roller (2) and expanded into a strip shape, is rounded again into a pipe shape and becomes a shape-retaining roller that surrounds the circular hole (7) at the bottom of each shape-retaining frame (6). After being guided, it returns to the driven roller (3) and circulates.

However, when the conveying path is long, the outward belt (1A) may be twisted in the middle due to deviation of the conveyed object. Means for correcting this are described, for example, in Japanese Patent Laid-Open Nos. 57-137206 and 57-141304.

Further, in order to detect the twist of the outward belt, Japanese Patent Laid-Open No.
There is provided a device as disclosed in the '34080 publication, ie as shown in FIGS. 7 and 8.

As shown in the drawing, such a device is configured such that both side edges (1C) (1C) of a rounded outward path (1A) where twisting easily occurs are forcedly opened, and front and rear portions 2 of these both end portions (1C) (1C). Each of the points is sandwiched by two pairs of front and rear pinch rollers (10) that are paired inward and outward and are pivotally supported by a shape retaining frame (not shown).

Then, between the two pairs of front and rear pinch rollers (10) forming a pair inside and outside, the side edge portion (1C) is orthogonal to the pair of pinch rollers (10) and is slightly separated from the same side edge portion (1C). A detection roller (11) movable in the extension direction is pivotally installed.

In the above-mentioned device, when the outward belt (1A) is twisted, the detection roller (11) on the side where the side edge portion (1C) protrudes is pushed outward and moves, and the detection roller (11) is attached to the shape retention frame. A switch (not shown) detects this, and a known twist straightening device is operated to straighten the twist.

(Problem to be Solved by the Invention) In the above-described twist detection device, it is necessary to forcibly open the rounded outward transport belt at the twist detection location, so that foreign matter is easily mixed into the transported object. Also, the conveyor belt may be damaged.

Further, the detection device is made up of many members, has a complicated structure, is large in size, is expensive, and is troublesome for maintenance and inspection.

Further, since the detection device is installed at a position where twist is expected in advance, there is also a drawback that the detection function is deteriorated for the twist at other positions.

(Means for Solving the Problems) The present invention proposes a twist detection device for such a pipe conveyor, and has the following configuration. That is, the first aspect of the present invention is a pipe conveyor in which an endless belt is wound around a pair of rollers, and the belt is rolled into a pipe shape between the rollers so as to run. While inserting the sensing element into the opening formed by forcibly expanding the side ends of the element at appropriate places, the element is brought into contact with the side edge of the conveyor belt,
A sensor for detecting rotation of the detection element about the axis of the pipe conveyor is provided, and the detection element is attached to a detection ring rotatably supported on an immovable body about the axis of the pipe conveyor. And a twist detection device in a pipe conveyor, preferably, the detection element is a pair of left and right detection rollers facing the centripetal direction, and the outer peripheral surface of each roller is in contact with the side edge of each conveyor belt. It is characterized by

In a second aspect of the present invention, in the above-described pipe conveyor, the detection element is brought into contact with an outer edge of the pipe-shaped conveyor belt, and the contact detection element is urged in a direction of being pressed against the outer edge of the conveyor belt. A sensor for detecting the rotation around the axis is provided, and the detection element surrounds a portion of the rounded forward transport belt and is pivotally supported by a detection ring supported by an immovable body so as to be rotatable around the axis. Preferably, the sensing element is a roller facing the centripetal direction.

(Operation) When the pipe-shaped outward transport belt is twisted, its side edge moves laterally. Therefore, in the case where the detection element is inserted into the opening of the transport belt, this is pushed by the side edge and To rotate in the direction.

Further, in the case where the free end of one sensing element is brought into contact with the outer edge of the overlapping portion, when the side edge presses the sensing element, the side edge tries to separate from the sensing element in the same direction. Then, it moves in the same direction as the side edge due to the bias.

Therefore, in either case, the detection element rotates in response to the twist of the conveyor belt, and the sensor detects this, so that the twist of the conveyor belt can be corrected by the correction device.

And, in particular, since the detection element is attached to the detection ring supported by the immovable body so as to be rotatable around the axis of the pipe conveyor, not only the detection function is more reliably exhibited, but also its structure is simplified. It is also excellent in terms of workability, assemblability and maintenance.

(Embodiment) FIGS. 1 to 3 show a preferred example of the first invention.

At a place where the outward belt (1A) is easily twisted, a detection element (12) surrounding the outward belt (1A) has a plurality of supporting rollers (13) pivotally supported by a shape retention frame (6) (not shown) and the outward belt (1A). ) Is rotatably supported around the axis.

At the center of the upper surface of the detection ring (12), outer ends of a pair of left and right detection rollers (14, 14) facing the centripetal direction and being parallel to each other are pivotally connected as detection elements.

At the portion surrounded by the detection ring (12) in the outward belt (1a), the side edge portion (1C) of the outward belt (1A) is slightly open, and inside the detection rollers (14) and (14). The end portion is inserted, and each detection roller (14) is in contact with the side edge portion (1C).

A downwardly T-shaped drive plate (15) is vertically provided at the center of the lower surface of the detection ring (12). Both ends of the horizontal piece (15A) of the drive plate (15) which is parallel to the detection ring (12) are curved slightly upward.

Directly below the horizontal piece (15A), a pair of left and right microswitches (16) (16) are attached to the shape retention frame (6).

When the drive plate (15) is directly below, the left and right micro switches (16) (16) are both open.

In the above device, the outward belt (1A) is, for example, the first belt.
When twisted clockwise in the figure, the left side edge (1C) presses the left detection roller (14) to the right, so that the detection ring (1C)
2) rotates clockwise, and the drive plate (15) rotates to the left.

Therefore, the horizontal piece (15A) is connected to the left micro switch (1
6) is closed and a known twist straightening device (not shown) is operated to correct the twist of the outward belt (1A).

FIG. 4 shows a preferred example of the second aspect of the invention, in which a detection ring (12) similar to that of the previous embodiment has a projecting piece (12A) projecting at its right end, a shape-retaining frame (6). It is urged clockwise by a tension spring (17) stretched between the two.

On the upper surface of the detection ring (12), the outer end of one detection roller (14) facing the centripetal direction is pivotally installed as a detection element, and on the lower surface of the detection ring (12) and immediately below it, the same as in the previous example. Drive plate (15) and a pair of left and right micro switches (16) (16) are provided.

The outer side edge (1C) facing the left side of the overlapping portion at the portion surrounded by the detection ring (12) in the outward belt (1A) is formed by a wedge plate (not shown) inserted before and after the overlapping portion. , Is slightly separated from the inner side edge portion (1C), and the detection roller (14) biased by the tension spring (17) is constantly provided at the end edge thereof under pressure.

In the above device, when the outward belt (1A) is twisted counterclockwise, the outer side edge (1C) pushes the detection roller (14) to the left, so that the detection ring (12) is counterclockwise. Rotate around. When the outward belt (1A) is twisted clockwise, the outer side edge portion (1C) is separated from the detection roller (14), so that the detection ring (12) has the detection roller (14) at the side edge portion (1C). ) Is rotated clockwise by the tension spring (17) until it comes into contact with
The twist of the outward belt (1A) is corrected as in the previous example.

In both of the above-mentioned embodiments, the drive plate (15) moving together with the detection ring (12) is detected by the microswitches (16) and (16), but a photoelectric sensor or a proximity sensor is used instead of the microswitch (16). You can also

Also, in the second example, the outer side edge portion (1C) of the outward belt (1A) is separated from the inner side edge portion (1C) by a wedge plate, and the outer side edge portion (1C) is separated from the inner side edge portion (1C). Detection roller at the edge of (14)
, But the detection roller (14) may only be pressed to the outer edges of both side end portions (1C) (1C) of the outward belt (1A) that overlap each other without using a wedge plate. .

(Effects of the Invention) In the apparatus of the present invention, in which the detection element is inserted into the opening of the conveyor belt, the opening provided in the conveyor belt for detecting the twist of the conveyor belt can be made narrower than the conventional apparatus. .

Also, in the case where the detection element is brought into contact with the overlapped outer edge of the conveyor belt, the outer edge can be detected in a state where it is overlapped with the inner edge, so that foreign matter is mixed into the conveyed portion. There is no risk of damage to the conveyor belt.

In addition, since the detection device can be securely fixed in both devices, the detection function is accurate, and the number and types of members constituting the detection device are small, so the detection device is simple and compact, and maintenance and inspection are easy and inexpensive. Can be provided.

[Brief description of drawings]

1 is a longitudinal sectional front view of a main part of a forward belt to which the present invention is applied, FIG. 2 is a vertical sectional view taken along line II-II of FIG. 1, and FIG. 3 is an enlarged view of part A of FIG. FIG. 4 is a longitudinal sectional front view of a main part of an outward belt to which the second invention is applied, FIG. 5 is a side view schematically showing a pipe conveyor, and FIG. 6 is an enlarged vertical sectional view taken along line IV-IV of FIG. FIG. 7 is a perspective view of a main part of a forward path belt equipped with a conventional twist straightening device, and FIG. 8 is a vertical sectional front view of the main part in FIG. (1) Conveyor belt, (1A) Forward belt, (1B) Return belt (1C) Side edge, (2) Drive roller, (3) Driven roller (4) Hopper, (5) Conveyed object, (6) Shape retention frame (7) circular hole, (8) shape retention roller, (9) load receiving hopper (10) pinch roller, (11) detection roller, (12) detection ring (12A) projecting piece, (13) support roller, (14) Detection roller (15) Drive plate (detection element), (16) Micro switch (sensor) (15A) Horizontal piece, (17) Tension spring

Claims (4)

[Claims] 1. A pipe conveyor in which an endless belt is wound around a pair of rollers, and the belt is rolled into a pipe shape between the rollers so as to be run, at a proper position of a rolled forward transport belt. The sensing element is inserted into the opening formed by forcibly expanding its side edges, the element is brought into contact with the side edge of the conveyor belt, and the rotation of the sensing element about the axis of the pipe conveyor is detected. A twist detecting device in a pipe conveyor, wherein a sensor is provided, and the detecting element is attached to a detecting ring rotatably supported by an immovable body around an axis of the pipe conveyor. 2. The detection element is a pair of left and right detection rollers facing the centripetal direction, and an outer peripheral surface of each roller is in contact with a side edge of each conveyor belt. A twist detecting device for a pipe conveyor according to the above. 3. A pipe conveyor in which an endless belt is wound around a pair of rollers, and the belt is rolled between the rollers to run around the pipe. A sensor for abutting the detection element on the edge, biasing the detection element in a direction in which the detection element is pressed against the outer edge of the conveyor belt, and a sensor for detecting the rotation of the detection element around the axis are provided, and the detection element is rounded. A twist detection device in a pipe conveyor, which is pivotally supported by a detection ring that surrounds a proper position of the outward transport belt and that is rotatable about an axis and is supported by an immovable body. 4. The twist detection device for a pipe conveyor according to claim 3, wherein the detection element is a roller oriented in a centripetal direction.