JPH09278136A - Belt conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a side deviation and a meadering of the return passage of a flat belt, as well as to make the belt run smoothly by correcting the habit to be rounded of the belt in the return passage of the flat belt. SOLUTION: To the beginning end side and the finishing end side in the return passage 1a of an endless flat belt 1 which is hung between a pair of front side and rear side rollers 3 and 4, a belt rounding device A to round the flat belt 1 in a cylindrical form gradually to the advancing direction by making a conveying surface 1c as the inner side; and a developing device B to develop the flat belt 1 rounded in a cylindrical form in a flat form gradually to the finishing end; are provided to compose this belt conveyer. In this belt conveyer, a pair of pinch rollers 23 and 23' which are separated in the advancing direction of the flat belt 1, and are made that the lower end of the part contacting to the upper side of the flat belt 1 is made lower than the upper end of the part contacting to the lower side of the flat belt 1, are provided at the upstream side of the rounding starting point, and the downstream side of the development finishing point, in the return passage 1b of the flat belt 1, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor capable of preventing a conveyed product or the like adhering to a conveying surface of a flat belt from falling on the return path of the flat belt which runs endlessly.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Patent Publication No. Sho 62-53407, a plurality of flat belts are supported by a support frame so that the front shape has an annular shape on the return path of the flat belt that runs endlessly. By passing between the shape-maintaining rollers, the flat belt is rounded into a substantially cylindrical shape with its conveying surface facing inward, and at a place near the start and end of the return path, intersect the tangent line of the cylindrical flat belt obliquely. Thus, there is a pair of belt twisting devices that are twisted by equal amounts in opposite directions.

According to such a conventional belt conveyor, the flat belt is rolled into a substantially cylindrical shape with the conveying surface facing inward, and the cylindrical flat belt is twisted by the belt twisting device to form both sides of the flat belt. The opening between the ends or the overlapped portions at both ends face upward or sideways, so that there is an advantage that a conveyed product adhered to the conveying surface of the flat belt does not drop in the middle of the return path.

[0004]

However, in the conventional belt conveyor as described above, the flat belt tends to be rounded at the rounding start point and the development end point in the return path of the flat belt, which is the belt. If the traveling resistance of the flat belt is insufficient or the belt is not sufficiently untwisted by the belt twisting device near the end of the return path of the flat belt, the flat belt after deployment may be laterally displaced and meander.

In view of the above-mentioned problems of the prior art, the present invention corrects the tendency of the flat belt on the return path to be rounded so that the flat belt can smoothly travel and An object of the present invention is to provide a belt conveyor capable of preventing lateral deviation and meandering of the belt return path.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A belt rounding device that gradually rolls the flat belt into a cylindrical shape in the traveling direction with the conveying surface as the inner side at the start end side and the end side of the return path of the endless flat belt wound between a pair of front and rear rollers. In a belt conveyor provided with a deploying device that deploys a flattened flat belt gradually flattened toward the end, on the upstream side of the rounding start point and the downstream side of the deployment end point in the return path of the flat belt, A pair of pinch rollers are provided, which are separated from each other in the traveling direction of the flat belt and are in contact with the upper surface of the flat belt so that their lower ends are lower than the upper ends of those that contact the lower surface of the flat belt.

(2) In the above item (1), a pair of pinch rollers are mounted on a single supporting frame so that the heights thereof can be adjusted independently of each other.

(3) In the above item (1) or (2), the angle of the pinch roller is adjustable so that one end of each pinch roller can be displaced in the traveling direction of the flat belt with respect to the other end. Attach to.

(4) In any one of the above items (1) to (3), the belt rounding device and the unfolding device are pivotally supported by the support frame so as to form a substantially annular shape, and the flat belt passes through the support frame. By providing a plurality of shape-retaining rollers for holding the flat belt in a cylindrical shape, the axis of the shape-retaining roller is diagonally intersected with the tangent line on the outer peripheral surface of the cylindrical flat belt. It is attached to the support frame with adjustable tilt angle.

(5) In any one of the above items (1) to (4), a second belt unfolding device is provided on the downstream side of the belt rounding device provided on the starting end side of the return path of the flat belt, and A second belt rounding device is provided on the upstream side of the unfolding device provided on the end side of the return path, and between the start end of the returning path of the flat belt and the second belt unfolding device, and between the second belt rounding device and the end of the returning path. By twisting the flat belts in opposite directions, the return path portion of the flat belt between the second belt unfolding device and the second belt rounding device is flattened with the conveying surface facing upward. In the case where the flat belt is rotated, the downstream side of the second belt unfolding device and the upstream side of the second belt rounding device are separated from each other in the traveling direction of the flat belt and are in contact with the upper surface of the flat belt. The lower end is
A pair of pinch rollers, which are in contact with the lower surface of the flat belt and are located below the upper end of the flat belt, are provided.

(6) In any one of the above items (1) to (5), at least the outer peripheral surface of one of the pair of pinch rollers that comes into contact with the conveying surface of the flat belt is made of rubber or polymer resin. Form.

[0012]

1 to 5 show an embodiment of the present invention. It should be noted that FIGS. 1 and 2 are schematic views even if the longitudinal direction of the transporting flat belt (1) is significantly shortened from the actual one.

In these figures, an endless flat belt (1)
Is wound around a pair of rollers (3) (4) pivotally supported at the front and rear ends of a connecting rod (2) supported almost horizontally (or sometimes in an upward or downward inclined state). By driving one of the rollers (3) and (4) by a motor (not shown), the rollers are driven endlessly as shown by an arrow in FIG. 1, and the upper end of the forward path (1a) (FIG. 1). At the left end) of the load receiving hopper (5), the conveyed product (6) is received and conveyed forward, and at the end of the forward path (1a), the conveyed product (6) is conveyed to the load receiving hopper (7). It is supposed to be dropped on.

In the outward path (1a) of the flat belt (1), the central portion pivotally supported on the upper end of the support frame (8) fixed at appropriate intervals in the longitudinal direction of the connecting rod (2). Are supported in a gutter shape by a large number of supporting rollers (9) each having a reverse trapezoidal arrangement in which the concave portions are recessed.

In the return path (1b) of the flat belt (1) from the rotation of the front roller (3) to the rear roller (4), the transport surface (1c) faces downward as it is and transports. Surface (1c)
There is a possibility that the conveyed material (6) attached to the sheet may fall at an arbitrary place on the return path (1b) and stain the lower part of the return path (1b).

Therefore, in the present embodiment, the flat belt (1) is directed in the traveling direction with the conveying surface (1c) as the inner side at the portion near the starting end (the portion of the front roller (3)) in the return path (1b). A belt rounding device (A) for gradually rounding into a cylindrical shape is provided, and a flat belt (1) rounded into a cylindrical shape is terminated at the end of the return path (1b) (the portion of the rear roller (4)). There is provided a deploying device (B) for progressively flattening toward.
In this embodiment, the belt rounding device (A) is
Place the flat belt (1) rolled into a cylinder into the center axis of the cylinder.
(L) Expanding device with a twisting function
(B) is provided with a function of twisting back the flat belt (1) rolled into a cylindrical shape by an equal amount in the direction opposite to the above-mentioned twisting.

Specifically, the belt rounding device (A) and the unfolding device (B) are arranged in a substantially annular front shape on appropriate supporting frames (8) near the start end and end of the return path (1b). The shape-maintaining roller (10) is provided with a plurality of pairs (six in the embodiment) pivotally supported so as to form the shape-maintaining roller (10).
By passing the flat belt (1) between the flat belt
(1) is designed to be rolled into a substantially cylindrical shape.

As shown in FIGS. 3 and 4, each shape-maintaining roller
Both ends of the shaft (10a) of (10) are pivotally supported by a bracket (11) having a substantially U shape, and such a pair of front and rear brackets (1
1) and (11) are back-to-back with each other, and the wedge-shaped spacers (12) and (12) are sandwiched between them and the supporting frame (8) between them, and five of them are inserted. The member (1) includes a bolt (15) and a nut (16) which are inserted through the shaft hole (13) formed in the support frame (8) and the arc-shaped elongated hole (14) centered on the shaft hole (13). By tightening the two shape-retaining rollers (10), the shafts (10a) of the shape-retaining rollers (10) with respect to the tangent line (L1) on the outer peripheral surface of the flat belt (1) having a cylindrical shape have shaft holes.
The tilt angle can be adjusted so that the X direction along the elongated hole (14) centered on (13) and the Y direction in which one end of the shaft (10a) is offset in the front-rear direction with respect to the other end are oblique. It is attached to the support frame (8).

It is preferable that all the shape-maintaining rollers (10) are provided with such X-direction and Y-direction inclination angle adjusting means, but any one or a plurality of holders in one set can be held. It is also possible to provide only on the shaping roller (10) and simply fix the other shape-maintaining rollers (10) at a fixed position.

As shown in FIGS. 1 and 2, the support frame (8) provided with the shape-retaining roller (10) in the belt rounding device (A).
In the support frame (8) between the one closest to the start end of the return path (1b) and the start end, there are three rounding rollers (17) arranged to expand downward in a trapezoidal shape. The rounding roller (17) is pivotally supported and cooperates with the shape-retaining roller (10) to gradually and smoothly roll the flat belt (1).

In the support frame (8) between the end and the end of the return path (1b) of the support frames (8) provided with the shape-retaining rollers (10) in the expanding device (B). Is supported by three deploying rollers (18) that spread downward in a trapezoidal shape in the same manner as the rounding roller (17). The deploying roller (18) is a pinch roller (described later). In cooperation with 23) and (23 '), the flat belt (1) is gradually and flatly developed.
The rounding roller (17) and the developing roller (18) described above can be omitted.

In this embodiment, a belt rolling device
A second belt deploying device (C) having three deploying rollers (19) similar to the deploying roller (18) described above is provided on the downstream side of (A), and on the upstream side of the deploying device (B). , A second belt rolling device (D) having three rounding rollers (20) similar to the above-mentioned rounding roller (17) is provided.
Flat belt (1) between (C) and the second belt rolling device (D)
The intermediate portion of the return path (1b) is rotated in a flat state with the transfer surface (1c) facing upward.

The return path (1) of such a flat belt (1)
In b), the belt rounding start point of the belt rounding device (A)
An upstream side of (P1), a downstream side of a deployment end point (P2) of the second belt unfolding device (C), and an upstream side of a rounding start point (P3) of the second belt rolling device (D), Deployment end point of deployment device (B)
A pinch roller device (E) as shown in FIGS. 5 to 7 is provided on the downstream side of (P4).

All the pinch roller devices (E) have the same structure, and a pair of right and left rectangular frame-shaped supporting frames (21) fixed to the connecting rod (2) and front and rear vertical rods of the supporting frame (21). A pair of front and rear pinch rollers (23) separated from each other in the traveling direction of the flat belt (1) pivotally supported by height and angle adjusting devices (22) and (22 ') on the facing surfaces of (21a) and (21b). ) (23 '). Out of the front and rear pinch rollers (23) (23 '), at least the transport surface of the flat belt (1)
The outer peripheral surface of the one contacting with (1c) is preferably formed of rubber or polymer resin.

The lower end of the front pinch roller (23) contacting the upper surface of the flat belt (1) is always lower than the upper end of the rear pinch roller (23) contacting the lower surface of the flat belt (1). . By doing so, the tendency of the flat belt (1) to be rounded is corrected, and the flat belt (1) can smoothly run.

Front and rear height and tilt angle adjusting device (22) (2
2 ') have the same structure upside down with respect to each other. Explaining only the one in front of them, the vertical rod (2
1a) slide plate (24) slidably mounted on the rear surface,
The protruding piece (25a) protruding from the lower end of the slide plate (24) is inserted, and the lower end portion is screwed into the protruding piece (25) protruding from the rear surface of the vertical rod (21a) (illustration Adjustment bolt (2)
6), a lock nut (27) that is screwed into the adjustment bolt (26),
The bearing (28) that pivotally supports each end of the pinch roller (23)
Spacer (29) of required thickness to be sandwiched between (28) and slide plate (24) as needed, bearing (28), spacer (29)
And the vertical rod (21a) while penetrating the slide plate (24).
Insert the vertical slot (30) in the vertical direction into the bearing (2
It is provided with a pair of upper and lower bolts and nuts (31) for fixing 8) and the like to the vertical rod (21a).

The height and inclination angle adjusting device (22 ') of the rear part has the same configuration as the above except that the vertical direction is reversed, and therefore the same members as those described above are designated by the same reference numerals. Is attached to the figure and is omitted in the figure, and detailed description is omitted.

With the bolts and nuts (31) loosened, the adjusting bolt (26) is turned to raise and lower the slide plate (24) and the bearing (28), and the bolts and nuts (31) are re-placed at desired positions. By tightening, the heights of the bearings (28) and the ends of the pinch rollers (23) (23 ') pivotally supported by the bearings (28) can be easily adjusted. Further, by making the heights of the left and right bearings (28), (28) slightly different, the inclination angle of the pinch roller (23) viewed from the front can be slightly changed (see FIG. 6).

Further, as shown in FIG. 7, the left and right bearings (2
By interposing a spacer (29) having a desired thickness between any one of 8) and (28) and the slide plate (24), one end of the pinch roller (23) with respect to the other end. The angle of the pinch roller (23) can be adjusted so that the flat belt (1) can be displaced in the traveling direction.

By performing such angle adjustment,
As shown in Fig. 7, attach each pinch roller (23) to the flat belt.
The flat belt (1) is slightly crossed with respect to the direction orthogonal to the traveling direction of (1) or the inclination angle in front view is changed.
Can correct the habit of lateral deviation.

In the above-described embodiment, the intermediate portion of the return path (1b) of the flat belt (1) is flattened so that the conveying surface (1c) faces upward and is rotated. But Figure 1
Also, as shown by an imaginary line in FIG. 2, there is a case where the intermediate portion of the return path (1b) is rotated while remaining in a cylindrical shape. In such a case, the downstream side of the expansion end point (P2) and the rounding start point (P2)
The pinch roller device (20) provided on the upstream side of 3) is omitted.

[0032]

According to the present invention, the following effects can be obtained. (a) According to the invention described in claim 1, the flat belt is bent in an up and down manner while passing through the pair of pinch rollers, so that the flat belt has a tendency to be rounded and a twisting tendency before passing. It will be corrected, and you can run smoothly.

(B) According to the second aspect of the invention, by independently adjusting the height of each pinch roller, it is possible to deal with the change of the thickness of the flat belt, and at the same time, to correct the above-mentioned correction action. It is possible to adjust the strength, the running resistance of the belt, which is inversely proportional to the strength, and the tension of the belt.

(C) According to the third aspect of the present invention, the flat belt can be smoothly moved straight by correcting the tendency of the flat belt to be laterally displaced or meandering. .

(D) According to the invention described in claim 4, in addition to the shape-maintaining roller for maintaining the flat belt in a cylindrical shape, it is necessary to provide a device for twisting the flat belt in the cylindrical shape. It can be eliminated and the structure can be simplified.

(E) According to the invention described in claim 5, the intermediate portion of the return path of the flat belt is developed in a flat state and rotated,
In the belt conveyor that was made to reverse the flat belt in the opposite direction before and after that, occurred when inverting the front and back,
Alternatively, the flat belt can be smoothly rotated by reliably removing the curling tendency and the twisting tendency of the flat belt remaining before the reversal.

(F) According to the sixth aspect of the invention, it becomes difficult for the conveyed material such as powder adhered to the conveying surface of the flat belt to move to the pinch roller side, and the flat belt can always be smoothly fed. it can.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention, in which the lengthwise direction of a flat belt is significantly shortened.

FIG. 2 is a schematic plan view similarly.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is an enlarged exploded perspective view of a main part.

FIG. 5 is an enlarged side view of a portion provided with a pinch roller device.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

[Explanation of symbols]

 (A) Belt rolling device (B) Unfolding device (C) Second belt unfolding device (D) Second belt rolling device (E) Pinch roller device (L) Central axis (L1) Tangent line (X) direction (Y) ) Direction (1) Flat belt (1a) Forward path (1b) Return path (1c) Transport surface (2) Connecting rod (3) (4) Roller (5) Load hopper (6) Transport surface (7) Load receiving hopper (8) Support frame (9) Support roller (10) Shape-maintaining roller (10a) Shaft (11) Bracket (12) Spacer (13) Shaft hole (14) Long hole (15) Bolt (16) Nut (17) (20) Rounding Roller (18) (19) Deploy roller (21) Support frame (21a) (21b) Vertical rod (22) (22 ') Height and tilt angle adjusting device (23) (23') Pinch roller (24) Slide plate (24a) Projection piece (25) Projection piece (26) Adjustment bolt (27) Lock nut (28) Bearing (29) Spacer (30) Long hole (31) Bolt / nut

Claims (6)

[Claims] 1. A belt rounding in which a flat belt is gradually rolled into a cylindrical shape in a traveling direction, with a conveying surface being an inner side, at a start end side and an end side of a return path of an endless flat belt wound around a pair of front and rear rollers. In a belt conveyor provided with a device and a deploying device that deploys a flattened flat belt gradually flattened toward the end, an upstream side of the rounding start point and a downstream side of the deployment end point in the return path of the flat belt. In addition, a pair of pinch rollers that are separated from each other in the traveling direction of the flat belt and are in contact with the upper surface of the flat belt so that the lower end of the flat belt is lower than the upper end of the flat belt are provided. Belt conveyor. 2. The belt conveyor according to claim 1, wherein a pair of pinch rollers are mounted on a single support frame so that their heights can be adjusted independently of each other. 3. The belt conveyor according to claim 1, wherein the pinch rollers are mounted on a support frame with an adjustable angle so that one end of each pinch roller can be displaced in the traveling direction of the flat belt with respect to the other end. . 4. A belt rounding device and a developing device are pivotally supported by a support frame so as to form a substantially annular shape, and the flat belt passes through the support frame to hold the flat belt in a cylindrical shape. A device comprising a plurality of shape-retaining rollers, wherein a shaft of the shape-retaining roller is mounted on a support frame such that a tilt angle thereof is adjustable so as to be oblique to a tangent line on an outer peripheral surface of a cylindrical flat belt. The belt conveyor according to any one of 3 above. 5. A second belt expanding device is provided on the downstream side of a belt rounding device provided on the starting end side of the return path of the flat belt, and a second belt expanding device is provided on the upstream side of the expanding device provided on the end side of the return path of the flat belt. By providing a belt rounding device for the flat belt and twisting the flat belts in opposite directions between the start end of the return path of the flat belt and the second belt unfolding device, and between the second belt rounding device and the end of the return path. A second part of the flattening belt between the second belt unfolding device and the second belt rounding device is configured to rotate in a flat state with the conveying surface facing upward. Both the downstream side of the device and the upstream side of the second belt rounding device are separated from each other in the traveling direction of the flat belt and are in contact with the upper surface of the flat belt, the lower end of which is lower than the upper end of which is in contact with the lower surface of the flat belt. Did 1 The belt conveyor according to claim 1, wherein a pair of pinch rollers are provided. 6. The belt conveyor according to claim 1, wherein at least one of the pair of pinch rollers, which comes into contact with the conveying surface of the flat belt, has an outer peripheral surface formed of rubber or polymer resin. .