JP3728569B2 - Belt conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveyor that can prevent a transported object or the like attached to a transport surface of a flat belt from falling in a return path of a flat belt that runs endlessly.
[0002]
[Prior art]
For example, as disclosed in Japanese Examined Patent Publication No. 62-53407, in the return path of a flat belt that runs endlessly, a plurality of shape-retaining rollers that support the flat belt on a support frame so that the front shape forms an annular shape are arranged By passing through, the flat belt is rounded into a substantially cylindrical shape with its conveying surface facing inward, and at a location close to the beginning and end of the return path, obliquely intersecting the tangent line of the cylindrical flat belt and in opposite directions Are provided with a pair of belt twisting devices which are twisted by an equal amount.
[0003]
According to such a conventional belt conveyor, the flat belt is rounded into a substantially cylindrical shape with the conveying surface facing inward, and the cylindrical flat belt is twisted by the belt twisting device, and between the both ends of the flat belt. Since the overlapped portions at the openings or both end portions face upward or laterally, there is an advantage that a conveyed object or the like attached to the conveying surface of the flat belt does not fall in the middle of the return path.
[0004]
[Problems to be solved by the invention]
However, in the conventional belt conveyor as described above, the flat belt tends to be rounded at the rounding start point and the unfolding end point in the return path of the flat belt. If the belt twisting back by the belt twisting device near the end of the return path is insufficient, the flat belt after deployment may be displaced laterally and meander.
[0005]
The present invention has been made in view of the above-described problems of the prior art, so that the belt in the return path of the flat belt can be fixed so that the belt can run smoothly, and the return path of the flat belt An object of the present invention is to provide a belt conveyor that can prevent lateral displacement and meandering of the belt.
[0006]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) A belt rounding device for gradually rounding a flat belt into a cylindrical shape in the direction of travel, with the conveying surface as an inner side, on the return end side of an endless flat belt wound around a pair of front and rear rollers In the belt conveyor provided with a developing device for gradually flattening the flat belt rounded into a cylindrical shape toward the end, on the upstream side of the rounding start point and the downstream side of the development end point in the return path of the flat belt, A pair of left and right pair of rectangular frame-shaped support frames that are separated in the direction of travel of the flat belt and whose lower end is in contact with the upper surface of the flat belt is lower than the upper end of what is in contact with the lower surface of the flat belt. to the facing surface of the rods before and after the pinch roller apparatus pivotally supported through a height and angle adjustment device for adjusting the angle of the pinch roller with respect to the traveling direction of the height and the flat belt of the pinch roller in Each arranged.
[0007]
(2) In the above item (1), the height and angle adjusting device has the same structure upside down and includes an adjustment bolt for adjusting the height of the bearing pivotally supporting each end of the pinch roller. Shall.
[0008]
(3) In the above item (1) or (2), the belt rounding device and the developing device are pivotally supported by the support frame so as to form a substantially annular shape, and the flat belt passes through the belt. A plurality of shape-retaining rollers configured to hold a cylindrical shape, the inclination angle of the shape-retaining roller shaft can be adjusted so as to be oblique to a tangent line on the outer peripheral surface of the cylindrical flat belt. Attach to the support frame.
[0009]
(4) In any one of the above items (1) to (3), a second belt deploying 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 the end of the return path of the flat belt A second belt rounding device is provided on the upstream side of the developing device provided on the side, between the beginning of the return path of the flat belt and the second belt developing device, and between the second belt rounding device and the end of the return path In this case, by twisting the flat belt in opposite directions, the return path portion of the flat belt between the second belt unfolding device and the second belt rounding device is rotated in a flat state with the conveying surface facing upward. In such a configuration, the lower end of the second belt unfolding device and the upstream side of the second belt rounding device are separated in the traveling direction of the flat belt and are in contact with the upper surface of the flat belt, The top edge of the flat belt Ri respectively disposed the pinch rollers of a pair of set to be lower.
[0010]
(5) In any one of the above items (1) to (4), at least the outer peripheral surface of the pair of pinch rollers that comes in contact with the conveying surface of the flat belt is formed of rubber or polymer resin.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 to 5 show an embodiment of the present invention. 1 and 2 schematically show a case where the longitudinal direction of the conveying flat belt (1) is significantly shortened from the actual one.
[0012]
In these figures, an endless flat belt (1) is a pair of pivots supported at the front and rear ends of a connecting rod (2) supported substantially horizontally (or may be used in an upward or downward inclined state). 1 is driven by a motor (not shown) and is driven endlessly as shown by the arrow in FIG. At the start end (the left end in FIG. 1) of the upper forward path (1a), the transported article (6) supplied from the load hopper (5) is received and transported forward, and the end section of the forward path (1a) In (5), the conveyed product (6) is dropped onto the cargo receiving hopper (7).
[0013]
In the forward path (1a), the flat belt (1) is pivotally supported at the upper end of the support frame (8) fixed at an appropriate interval in the longitudinal direction of the connecting rod (2). Thus, it is supported in a bowl shape by a large number of support rollers (9), each of which has an inverted trapezoidal arrangement.
[0014]
In the return path (1b) of the flat belt (1) from the front roller (3) to the rear roller (4), the conveying surface (1c) faces downward and the conveying surface (1c There is a risk that the transported object (6) adhering to) will drop at an arbitrary location on the return path (1b) and contaminate the lower part of the return path (1b).
[0015]
Therefore, in this embodiment, the flat belt (1) is gradually cylindrical toward the traveling direction with the conveying surface (1c) on the inner side of the return path (1b) near the starting end (front roller (3) portion). A belt rounding device (A) that rounds into a circular shape is provided, and a flat belt (1) that is rounded into a cylindrical shape is placed toward the end of the return path (1b) near the end (the rear roller (4)). An unfolding device (B) for unfolding gradually is provided.
In this embodiment, the belt rounding device (A) has a function of twisting the flat belt (1) rounded into a cylindrical shape around the central axis (L) of the cylinder, and the developing device. (B) has a function of twisting back the flat belt (1) rounded into a cylindrical shape by an equal amount in the opposite direction to the twist.
[0016]
Specifically, the belt rounding device (A) and the unfolding device (B) are arranged so that the front shape is substantially annular on the appropriate support frame (8) near the start and end of the return path (1b). A plurality of shape-retaining rollers (10), each having a plurality of (six in the embodiment) pivotally supported by the shaft, are provided, and a flat belt (1) is placed between each shape-retaining roller (10). By passing, the flat belt (1) is rounded into a substantially cylindrical shape.
[0017]
As shown in FIGS. 3 and 4, both ends of the shaft (10a) of each shape-retaining roller (10) are pivotally supported by a bracket (11) having a substantially U-shape, such a pair of front and rear brackets. (11) (11) are set back-to-back in the back-and-forth direction, and a wedge-shaped spacer (12) (12) is sandwiched between them and the supporting frame (8) between them as necessary. Bolts (15) and nuts (16) through which a single member is inserted through a shaft hole (13) drilled in the support frame (8) and an arc-shaped long hole (14) centered on the shaft hole (13) The two shape-retaining rollers (10) at the front and rear of the shaft (10a) have a shaft hole (L1) with respect to the tangent (L1) on the outer peripheral surface of the flat belt (1) having a cylindrical shape. Supports tilt angle adjustment so that the X direction along the long hole (14) centered at 13) and the Y direction in which one end of the shaft (10a) deviates in the front-rear direction with respect to the other end It is attached to the frame (8).
[0018]
Such a tilt angle adjusting means for the X direction and the Y direction is preferably provided in all the shape retaining rollers (10), but any one or a plurality of shape retaining rollers ( The other shape-retaining roller (10) may be provided only at 10) and only fixed at a fixed position.
[0019]
As shown in FIGS. 1 and 2, the support frame (8) provided with the shape-retaining roller (10) in the belt rounding device (A) is closest to the start end of the return path (1b) and the start end. Three rounding rollers (17) arranged so as to expand downward in a trapezoidal shape are pivotally supported on the support frame (8) between them, and these rounding rollers (17) are formed by shape retaining rollers ( In cooperation with 10), the flat belt (1) is gradually and smoothly rounded.
[0020]
Of the support frame (8) provided with the shape retaining roller (10) in the developing device (B), the support frame (8) between the end closest to the return path (1b) and the end is rounded. In the same manner as the roller (17), three developing rollers (18) that expand in a trapezoidal shape downward are pivotally supported. The developing rollers (18) are pinch rollers (23) (described later). 23 '), the flat belt (1) is gradually flattened. The rounding roller (17) and the developing roller (18) described above can be omitted.
[0021]
In this embodiment, a second belt deploying device (C) having three deploying rollers (19) similar to the above-described deploying roller (18) is provided on the downstream side of the belt rounding device (A), and A second belt rounding device (D) having three rounding rollers (20) similar to the rounding roller (17) described above is provided on the upstream side of the developing device (B). The intermediate part of the return path (1b) of the flat belt (1) between C) and the second belt rounding device (D) is rotated in a flat state with the conveying surface (1c) facing upward. .
[0022]
In such a return path (1b) of the flat belt (1), the upstream side of the belt rounding start point (P1) of the belt rounding device (A) and the end point of deployment of the second belt developing device (C) ( The downstream side of P2), the upstream side of the rounding start point (P3) of the second belt rounding device (D), and the downstream side of the deployment end point (P4) of the deployment device (B) are shown in FIGS. A pinch roller device (E) as shown in FIG. 7 is provided.
[0023]
Each pinch roller device (E) has the same structure, and a pair of left and right rectangular frame support frames (21) fixed to the connecting rod (2), and vertical rods (21a) before and after the support frame (21). A pair of front and rear pinch rollers (23) (23) separated from each other in the advancing direction of a flat belt (1) pivotally supported on opposite surfaces of (21b) via height and angle adjusting devices (22) and (22 ') ') And. Of the front and rear pinch rollers (23) and (23 ′), at least the outer peripheral surface of the one in contact with the conveying surface (1c) of the flat belt (1) is preferably formed of rubber or polymer resin.
[0024]
The lower end of the front pinch roller (23) in contact with the upper surface of the flat belt (1) is always lower than the upper end of the rear pinch roller (23) in contact with the lower surface of the flat belt (1). By doing in this way, the habit that the flat belt (1) tries to round is corrected, and the flat belt (1) can smoothly run.
[0025]
The front and rear height and inclination angle adjusting devices (22) and (22 ') have the same structure upside down, and only the one in front of them will be described on the rear surface of the vertical vertical rod (21a). The slide plate (24) mounted slidably and the projecting piece (25a) projecting from the lower end of the slide plate (24) are inserted, and the lower end portion projects from the rear surface of the vertical rod (21a). Each of an adjustment bolt (26) screwed into a screw (not shown) drilled in the projected piece (25), a lock nut (27) screwed into the adjustment bolt (26), and a pinch roller (23) A bearing (28) pivotally supporting the end, a spacer (29) having a required thickness sandwiched between the bearing (28) and the slide plate (24) as necessary, a bearing (28), a spacer (29 ) And the slide plate (24) and the vertical holes (30a) drilled in the vertical rod (21a) are inserted in the vertical holes (30) to fix the bearing (28) etc. to the vertical rod (21a). A pair of bolts and nuts (31) is provided.
[0026]
The rear height and inclination angle adjusting device (22 ') has the same configuration as above except that the vertical direction is reversed, and therefore the same members as those described above are denoted by the same reference numerals. The detailed description is omitted.
[0027]
With the bolt and nut (31) loosened, turn the adjustment bolt (26) to raise and lower the slide plate (24) and bearing (28), and then tighten the bolt and nut (31) again at the desired position. The heights of the end portions of the bearings (28) and the pinch rollers (23) and (23 ') pivoted on the bearings (28) can be easily adjusted. Moreover, the inclination angle seen from the front of the pinch roller (23) can be slightly changed by making the heights of the left and right bearings (28) and (28) slightly different (see FIG. 6).
[0028]
Further, as shown in FIG. 7, a spacer (29) having a desired thickness is interposed between one of the left and right bearings (28) and (28) and the slide plate (24), thereby pinching. The angle of the pinch roller (23) can be adjusted so that one end of the roller (23) can be displaced in the traveling direction of the flat belt (1) with respect to the other end.
[0029]
By performing such an angle adjustment, as shown in FIG. 7, each pinch roller (23) is slightly inclined with respect to the direction orthogonal to the traveling direction of the flat belt (1), or the front view is inclined. By changing the angle, it is possible to correct the habit that the flat belt (1) tends to deviate laterally.
[0030]
In the above-described embodiment, the intermediate portion of the return path (1b) of the flat belt (1) is unfolded flat so that the conveying surface (1c) faces upward, and is rotated. As indicated by imaginary lines in FIGS. 1 and 2, there is a case where the middle part of the return path (1b) is made to run in a cylindrical shape. In such a case, the pinch roller device (20) provided on the downstream side of the unfolding end point (P2) and the upstream side of the rounding start point (P3) is omitted.
[0031]
【The invention's effect】
According to the present invention, the following effects can be achieved.
(a) According to the first aspect of the present invention, the flat belt is bent so as to wave up and down while passing through the pair of pinch rollers, and the twisting curl before passing or twisting. Etc. are corrected and can run smoothly.
[0032]
In addition, by independently adjusting the height of each pinch roller, it is possible to cope with a change in the thickness of the flat belt, and the strength of the correction action described above and the running resistance of the belt that is inversely proportional to it. Size, belt tension, etc. can be adjusted.
[0033]
Et al. Is, can be flat belt is fix the habit of trying to or meandering or displaced to the side, so that can be smoothly straight through the flat belt.
[0034]
(b) According to the invention described in claim 2, the height and angle adjusting device has the same structure upside down, and the adjustment bolt for vertically adjusting the height of the bearing pivotally supporting each end of the pinch roller. Therefore, by adjusting the height of each pinch roller independently, it is possible to respond to changes in the thickness of the flat belt, and the belt has an inversely proportional relationship with the strength of the straightening action described above. It is possible to adjust the magnitude of the running resistance and the tension of the belt.
[0035]
( c ) According to the invention of claim 3 , in addition to the shape retaining roller for maintaining the flat belt in a cylindrical shape, it is not necessary to provide a device for twisting the flat belt in the cylindrical shape. Can be simplified.
[0036]
( d ) According to the invention described in claim 4 , in the belt conveyor in which the middle part of the return path of the flat belt is developed and rotated in a flat state, and the flat belt is reversed reversely before and after the belt conveyor, The flat belt can be smoothly rotated by reliably removing rounding or twisting of the flat belt that occurred at the time of reversal of the belt or remained before the reversal.
[0037]
( e ) According to the invention described in claim 5 , it is difficult for a transported object such as powder adhering to the transport surface of the flat belt to move to the pinch roller side, and the flat belt can always be smoothly fed.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing an embodiment of the present invention with the longitudinal direction of a flat belt shortened significantly.
FIG. 2 is a schematic plan view of the same.
3 is an enlarged sectional view taken along line III-III in FIG.
FIG. 4 is an enlarged exploded perspective view of a main part.
FIG. 5 is an enlarged side view of a portion where a pinch roller device is provided.
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
(A) Belt rounding device
(B) Deployment device
(C) Second belt deployment device
(D) Second belt rounding device
(E) Pinch roller device
(L) Center axis
(L1) Tangent
(X) direction
(Y) direction
(1) Flat belt
(1a) Outbound
(1b) Return
(1c) Conveying surface
(2) Linkage
(3) (4) Roller
(5) Loading hopper
(6) Conveying surface
(7) Receipt hopper
(8) Support frame
(9) Support roller
(10) Shape retaining roller
(10a) shaft
(11) Bracket
(12) Spacer
(13) Shaft hole
(14) Long hole
(15) Bolt
(16) Nut
(17) (20) Rolling roller
(18) (19) Roller
(21) Support frame
(21a) (21b) Vertical rod
(22) (22 ') Height and tilt angle adjustment device
(23) (23 ') Pinch roller
(24) Slide plate
(24a) Projection
(25) Projection
(26) Adjustment bolt
(27) Lock nut
(28) Bearing
(29) Spacer
(30) Long hole
(31) Bolt / Nut

Claims (5)

A belt rounding device that gradually rounds the flat belt into a cylindrical shape in the direction of travel, with the conveying surface as the inner side, on the return side of the return path of the endless flat belt wound between a pair of front and rear rollers, and cylindrical In a belt conveyor provided with a developing device for gradually flattening the flat belt rounded to the end toward the end,
On the upstream side of the round belt starting point on the return path of the flat belt and on the downstream side of the unfolding end point, the lower end of the flat belt that is in the traveling direction and is in contact with the upper surface of the flat belt is lower than the upper end of the flat belt The height of the pinch roller and the angle of the pinch roller with respect to the traveling direction of the flat belt are adjusted to the opposed surfaces of the front and rear vertical scissors in the pair of left and right rectangular frame-shaped support frames. A belt conveyor comprising a pinch roller device pivotally supported via a height and angle adjusting device . The belt conveyor according to claim 1 , wherein the height and angle adjusting device has the same structure upside down and includes an adjustment bolt for adjusting the height of a bearing pivotally supporting each end of the pinch roller .   A plurality of shape-retaining rollers in which 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 belt, thereby holding the flat belt in a cylindrical shape. The belt conveyor according to claim 1 or 2, wherein the shaft of the shape-retaining roller is mounted on the support frame so that the inclination angle can be adjusted so as to obliquely intersect with a tangent to the outer peripheral surface of the cylindrical flat belt. .   A second belt deploying device is provided on the downstream side of the belt rounding device provided on the start end side of the return path of the flat belt, and a second belt rounding device is provided on the upstream side of the deploying device provided on the terminal end side of the return path of the flat belt. Between the start end of the return path of the flat belt and the second belt deploying device, and between the second belt rounding device and the end of the return path, by twisting the flat belt in opposite directions, In the flat belt in which the return path portion of the flat belt between the belt developing device and the second belt rounding device is rotated in a flat state with the conveying surface facing upward, the downstream side of the second belt developing device, The pair of the second belt rounding device that is separated from the upper end of the belt that is separated in the traveling direction of the flat belt and that contacts the upper surface of the flat belt is lower than the upper end of the belt that contacts the lower surface of the flat belt. Pincillo Belt conveyor according to claim 1, La respectively disposed.   The belt conveyor according to any one of claims 1 to 4, wherein an outer peripheral surface of at least one of the pair of pinch rollers that comes into contact with the conveying surface of the flat belt is formed of rubber or polymer resin.

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