JP7083584B2 - Steel plate for curved conveyor frame and curved conveyor frame manufactured using it - Google Patents

Description

The present invention relates to a steel plate for a curve conveyor suitable for manufacturing a curve conveyor frame and a curve conveyor frame manufactured by using the steel plate for a curve conveyor. More specifically, a steel plate for a curved conveyor frame provided with a tensile promoting means, a compression promoting means, and a stress relaxing means in bending, which can shorten the bending time for manufacturing the curved conveyor frame, and a steel plate thereof are used. Concerning the curved conveyor frame manufactured in Japan.

In a roller conveyor used as a device for transporting articles along a transport path, a pair of conveyor frames corresponding to each other via a predetermined interval can rotate a plurality of conveyor frames from both sides at a fixed interval. It is arranged so as to support the transport roller shaft, and is formed so as to extend along a predetermined transport path.

In the case of a roller conveyor having a linear transport path, the conveyor frame has a groove shape or C after forming a transport roller shaft fitting hole that rotatably supports the transport roller at a predetermined position on a substantially rectangular steel plate. It can be manufactured by bending it into a shape.

On the other hand, in the case of a curved roller conveyor in which the transport path shown in FIG. 1 has a curved shape having a constant curvature, the pair of arcuate conveyor frames corresponding to each other via a predetermined interval are also the same as the linear conveyor frame. Then, by further performing a roll bending process on an arc from the opposite direction, two types of conveyor frames, outer and inner, are manufactured. In this roll bending process, for example, when the inner conveyor frame is manufactured by the three-roll method, the conveyor frame a has a groove-shaped or C-shaped protrusion with the drive bottom rolls b and d , as shown in FIG. It is sandwiched between a stepped top roll c provided with a recess so that the portion can be accommodated, and the stepped top roll c is lowered by the top roll pressurizing device e, and at the same time, the drive bottom rolls b and d are rotated to rotate the conveyor frame. It is applied while swinging a linearly. As a result, as shown in FIG. 2, a pair of outer and inner curved conveyor frames are manufactured.

However, the bending process by the roll method has the following problems. The conveyor frame is generally a hot-rolled steel sheet, which is a steel sheet obtained by rolling an ingot at a high temperature, and is a soft type steel sheet with a small amount of carbon and no work hardening. Although it is used as a drawing and deep drawing material, it requires an extremely long processing time because it is a conveyor frame a formed in a groove shape or a C shape in which bending strength is enhanced. When trying to shorten the machining time, complicated stress such as compression and tension is applied to the conveyor frame a, which may cause damage such as cracks to the manufactured curved conveyor frames 3 and 4, resulting in thermal pressure profile and rocking. It cannot be dealt with only by roll bending conditions such as profiles. Therefore, in Patent Document 1, by providing slits on the outside of the outer curve conveyor frame and the inside of the inner roll conveyor frame, it is possible to prevent wrinkles generated on the compressed inner side of the outer curve conveyor and the inner curve conveyor. Patent Document 2 reports that a groove-shaped conveyor frame is easier to process and has higher bending accuracy than a C-shaped conveyor frame. However, there are still no reports of mentioning shortening of roll bending time without compromising the quality of the curved conveyor frame.

Further, as is clear from FIG. 2, the outer curved conveyor frame 3 is machined with bending lines 5 and 5'on both sides of the shaft bearing wall portion (web) 7 provided with the roller shaft fitting holes 11. Since the flange portions 9 and 9'are bent outward, a tensile force is strongly applied to the groove side of the flange portions 9 and 9', and a compressive force is strongly applied to the shaft bearing wall portion 7 and the proximal end side of the flange. On the contrary, the inner curved conveyor frame 4 has flange portions 10 and 10'machined with bending lines 6 and 6'on both sides of the shaft bearing wall portion (web) 8 provided with the roller shaft fitting holes 12. Since the flange portions 10 and 10'are bent inward, a compressive force is strongly applied to the groove side thereof, and a tensile force is strongly applied to the shaft bearing wall portion 8 and the proximal end side of the flange. As described above, in the outer curved conveyor frame 3 and the inner curved conveyor frame 4, opposite stresses are applied during the roll bending process, so that the roll bending time can be shortened without impairing the quality of the curved conveyor frame. Will need a suitable solution for each.

Japanese Unexamined Patent Publication No. 2002-46831 Japanese Unexamined Patent Publication No. 2000-2474223

As is clear from the background techniques described above, the present invention provides means that can reduce the roll bending time for forming a curved conveyor frame from a bent conveyor frame without impairing the quality of the curved conveyor frame. The purpose is to provide.

As a result of examining the stress applied to the outer curved conveyor frame and the inner curved conveyor frame for manufacturing the curved conveyor frame, the present inventor has pulled the steel plate for the curved conveyor frame to be bent into the outer curved conveyor frame. By providing the promoting means and the stress relaxing means, the steel plate for the curved conveyor frame to be bent on the inner curved conveyor frame can be significantly shortened in the roll bending time by providing the compression promoting means and the stress relaxing means. Was found, and the present invention was completed.

That is, the steel plate for the outer curved conveyor frame of the present invention is substantially rectangular, and is formed on the outer periphery of the curved conveyor frame flange portion partitioned by the bending line and the outer periphery of the curved conveyor frame flange portion in the long direction to promote bending tension. It is characterized by comprising means and bending stress relaxing means formed inside the curved conveyor frame flange portion. More specifically, the outer curved conveyor frame steel plate of the present invention is sandwiched between a curved conveyor frame flange portion partitioned by bending lines at the top and bottom and the curved conveyor frame flange portion in a substantially rectangular curved conveyor frame steel plate. Inside the curved conveyor shaft bearing wall portion in which the roller shaft fitting hole is formed, the bending tension promoting means formed on the outermost circumference of the curved conveyor frame flange portion in the long direction, and the inside of the curved conveyor frame flange portion. It is characterized by being provided with a formed bending stress relieving means. It is preferable that the bending tension promoting means is a convex portion formed on the outer periphery of the flange portion, and the stress relaxation means is a hole formed inside the flange portion. Moreover, the bending tension promoting convex portion and the bending stress relaxation hole portion are formed on the same vertical line with respect to the long direction of the substantially rectangular curved conveyor frame steel plate, and are formed at regular intervals. It is even more preferable to have.

On the other hand, the steel plate for the inner curved conveyor frame of the present invention is substantially rectangular, and is bent and compressed formed on the outer periphery of the curved conveyor frame flange portion partitioned by the bending line and the outer periphery of the curved conveyor frame flange portion in the long direction. It is characterized by comprising a facilitating means and a bending stress relieving means formed inside the curved conveyor frame flange portion. More specifically, the inner curved conveyor frame steel plate of the present invention is sandwiched between a curved conveyor frame flange portion partitioned vertically by bending lines and a curved conveyor frame flange portion in a substantially rectangular curved conveyor frame steel plate. Inside the curved conveyor shaft bearing wall portion in which the roller shaft fitting hole is formed, the bending compression promoting means formed on the outermost circumference of the curved conveyor frame flange portion in the long direction, and the inside of the curved conveyor frame flange portion. It is characterized by being provided with a formed bending stress relieving means. It is preferable that the bending compression promoting means is a recess formed on the outer periphery of the flange portion, and the bending stress relaxation means is a hole formed inside the flange portion. Moreover, the bending compression promoting recess and the bending stress relaxation hole are formed on the same vertical line with respect to the long direction of the substantially rectangular curved conveyor frame steel plate, and are formed at regular intervals. Is even more preferable.

Further, in the steel plate for a curved conveyor frame of the present invention, in both the outer curved conveyor frame and the inner curved conveyor frame, the bending stress relief holes are vertically divided into the bending line and the flange portion of the curved conveyor frame. It may be formed over the curved conveyor shaft bearing wall portion in which the roller shaft fitting hole sandwiched between the curved conveyor frame flange portions partitioned by the bending line is formed, and such bending stress relief may be formed. In the case of a steel plate for an inner curved conveyor frame, the hole portion may be a slit that is connected to a bending compression recess and is opened perpendicularly to the elongated direction of the flange portion.

In particular, it is preferable that the bending tension promoting protrusions, the bending compression promoting recesses, and the bending stress relaxation holes are formed at regular intervals in both the outer curved conveyor frame and the inner curved conveyor frame. Further, it is more preferable that the roller shaft fitting hole is arranged between the bending tension promoting convex portion, the bending compression promoting concave portion, and the bending stress relaxation hole portion.

The present invention is characterized in that, using the above-mentioned steel plates for outer and inner curved conveyor frames, a groove-shaped or C-shaped conveyor frame formed by bending such as a press is manufactured by roll bending. And the inner curved conveyor frame.

When a groove-shaped or C-shaped conveyor frame formed by bending such as a press is roll-bent using the steel plate for a curved conveyor frame of the present invention, the curved conveyor frame is not damaged such as cracks and wrinkles. The processing time can be significantly shortened while maintaining the quality of the conveyor belt, and productivity can be improved and costs can be reduced. In addition, the roll bending accuracy is improved, and the positional accuracy between the outer and inner curved conveyor frame roller shaft fitting holes and the transport roller can be improved.

It is a plan view of a general curve conveyor. It is a schematic diagram of the conventional general curve conveyor frame. It is a schematic diagram of the curve conveyor frame which concerns on one Embodiment of this invention. It is a top view of the steel plate for the outer curve conveyor frame which concerns on one Embodiment of this invention. It is a top view of the steel plate for an inner curve conveyor frame which concerns on one Embodiment of this invention. It is a top view of the steel plate for the outer curve conveyor frame which concerns on one Embodiment of this invention. It is a top view of the steel plate for an inner curve conveyor frame which concerns on one Embodiment of this invention. It is an enlarged plan view of the outer curve frame manufactured by using the steel plate for the outer curve conveyor frame of FIG. 6 which concerns on one Embodiment of this invention. It is an enlarged plan view of the outer curve frame manufactured by using the steel plate for the inner curve conveyor frame of FIG. 7 which concerns on one Embodiment of this invention. It is a schematic diagram of a bending machine for manufacturing a curve frame.

Hereinafter, the present invention will be described in more detail using the embodiments shown in the drawings, but the present invention is not limited to these embodiments, but is limited only by the technical idea described in the claims. Is to be done.

FIG. 3 shows a groove-shaped outer and inner conveyor frames obtained by bending a steel plate for an outer curved conveyor frame of FIG. 4 and a steel plate for an inner curved conveyor frame of FIG. 5, which is an embodiment of the present invention, by pressing or the like. The outer curved conveyor frame 3 and the inner conveyor frame 4 manufactured by the three-roll type bending process are shown.

As shown in FIG. 4, the pre-bending tension promoting convex portion 18 is inside the flange portions 9, 9'where the pre-bending stress relief holes 17, 17'are partitioned by the bending lines 5, 5'. 18'is formed at regular intervals on the outside of the flange portions 9, 9'partitioned by the bending lines 5, 5', and the roller shaft fitting holes 11 are formed on the outside sandwiched by the flange portions 9, 9'. Curved conveyor frame shaft The bearing wall 7 is processed as a substantially rectangular outer curved conveyor frame steel plate formed at regular intervals. Here, the positional relationship between the pre-bending stress relaxation holes 17 and 17'and the pre-bending tension-promoting convex portions 18 and 18'is on the same vertical lines I and II of the substantially rectangular outer curved conveyor frame steel plate. It is preferable, and it is more preferable that these intervals III are substantially constant. If this interval is too small, there will be a problem with the mechanical strength of the curved conveyor, and if it is too large, it will be difficult to promote tension in roll bending and shorten the processing time. Further, it is more preferable that the roller shaft fitting hole 11 is located between these intervals. This is because when the roller shaft fitting holes 11 are located between these intervals, the mechanical strength of the curved conveyor frame is excellent, and the machining time in the roll bending process can be shortened. Further, the vertical lines I and II correspond to I and II in the radial direction of curvature of the curved conveyor shown in FIG. 1, which improves the roll bending accuracy and the outer curved conveyor frame roller shaft fitting hole 11 And the position accuracy of the transfer roller 3 are improved. On the other hand, the shearing method for manufacturing the steel plate for a curved conveyor frame in this way is carried out by a general method, for example, punching, electric discharge machining, laser machining, or the like, and the above-mentioned various shapes may be formed at the same time. , May be formed sequentially. Deburring and sagging at the cut end are removed with a general deburring machine.

The steel plate for the outer curved conveyor frame of FIG. 4 thus obtained is formed into a groove-shaped conveyor frame by bending such as a press at the bending lines 5 and 5', and then shown in FIG. 10, for example, 3 Roll bending is performed by this roll method to form the outer curved conveyor frame 3 shown in FIG. Here, FIG. 10 shows roll bending of the inner curve conveyor frame, but in the case of roll bending of the outer curve conveyor frame, the stepped top roll is replaced with one drive bottom roll, and the drive bottom roll is stepped. It is replaced with two top rolls and processed.

In the outer curved conveyor frame 3 of FIG. 3, the post-bending stress relaxation holes 13, 13'and the post-bending tension-promoting convex portions 15, 15'are recognized in the flange portions 9, 9', but the pre-bending stress. The shapes are different from those of the relaxation holes 17, 17'and the tension-promoting protrusions 18, 18'before bending. An enlarged view of the shape of the outer curved conveyor frame after bending is shown in FIG. As is clear from the figure, the stress relaxation holes 13 and 13'after the roll bending process have smaller insides to relax the stress, and the tension promoting protrusions 15 and 15'after the bending process have a flat shape and tension is applied. It can be seen that it is being promoted. From this, it is considered that the roll bending time could be significantly shortened without impairing the quality of the outer curved conveyor frame. However, the shapes of the post-bending stress relaxation holes 13 and 13'and the post-bending tension-promoting convex portions 15 and 15'are for explaining the above effects in an easy-to-understand manner, and are different from the actual shapes.

The same applies to the inner curved conveyor frame. As shown in FIG. 5, the pre-bending stress relaxation hole portion 19, 19'is inside the flange portion 10, 10'that is partitioned by the bending line 6, 6', and the pre-bending pull compression promoting recess 20 20'is formed at regular intervals on the outside of the flange portions 10 and 10'partitioned by the bending lines 6 and 6', and the roller shaft fitting holes 12 are formed on the outside sandwiched by the flange portions 10 and 10'. Curved Conveyor Frame Shaft A substantially rectangular outer curved conveyor frame steel plate formed on the bearing wall 8 at regular intervals is processed. Here, the positional relationship between the pre-bending stress relaxation holes 19 and 19'and the pre-bending compression promoting recesses 20 and 20'is on the same vertical lines I and II of the substantially rectangular outer curved conveyor frame steel plate. Is preferable, and it is more preferable that these intervals III are substantially constant. If this interval is too small, there will be a problem with the mechanical strength of the curved conveyor, and if it is too large, it will be difficult to promote compression in roll bending and shorten the processing time. Further, it is more preferable that the roller shaft fitting hole 12 is located between these intervals. This is because when the roller shaft fitting holes 12 are located between these intervals, the mechanical strength of the curved conveyor frame is excellent, and the machining time in the roll bending process can be shortened. Further, the vertical lines I and II correspond to I and II in the radial direction of the curve conveyor shown in FIG. 1, which improves the roll bending accuracy and the outer curved conveyor frame roller shaft fitting hole 12 And the position accuracy of the transfer roller 3 are improved. On the other hand, the shearing method for manufacturing the steel plate for a curved conveyor frame in this way is carried out by a general method, for example, punching, electric discharge machining, laser machining, or the like, and the above-mentioned various shapes may be formed at the same time. , May be formed sequentially. Deburring and sagging at the cut end are removed with a general deburring machine.

The steel plate for the outer curved conveyor frame of FIG. 5 thus obtained is formed into a groove-shaped conveyor frame by bending such as a press at the bending lines 6 and 6', and then shown in FIG. 10, for example, 3 Roll bending is performed by this roll method to form the inner curved conveyor frame 4 shown in FIG.

In the inner curved conveyor frame 4 of FIG. 3, post-bending stress relaxation holes 14, 14'and post-bending compression promotion recesses 16 and 16'are found in the flange portions 10 and 10', but pre-bending stress relaxation. The shapes are different from the holes 19 and 19'and the compression promotion recesses 20 and 20'before bending. An enlarged view of the shape of the inner curved conveyor frame after bending is shown in FIG. As is clear from the figure, the stress relaxation holes 14 and 14'after the roll bending are large on the outside to relax the stress, and the compression promoting recesses 16 and 16'after the bending are small and the compression is promoted. You can see that. From this, it is considered that the roll bending time could be significantly shortened without impairing the quality of the inner curved conveyor frame. However, the shapes of the post-bending stress relaxation holes 14, 14'and the post-bending compression promoting recesses 16, 16'are for explaining the above effects in an easy-to-understand manner, and are different from the actual shapes.

Further, the bending stress relaxation holes formed in the outer and inner curved conveyor frame steel plates are formed in the flange portions 9, 9', 10 and 10', respectively, as shown in FIGS. 4 and 5. It is not limited to cases. As shown in FIGS. 6 and 7, in the case of the steel plate for the outer curved conveyor frame, the bending stress relief holes 21, 21'formed over the flange portions 9, 9'and the shaft bearing wall portion 7, In the case of the steel plate for the inner curved conveyor frame, it is more preferable that the bending stress relief holes 22 and 22'formed over the flange portions 10 and 10'and the shaft bearing wall portion 8.

Further, although not shown in the figure, it is more preferable that the bending stress relaxation hole portion forms a slit in the flange portion along the vertical lines I and II in both the outer and inner curved conveyor frames.

Although the present invention has been described in detail with reference to the drawings, it is an embodiment, and the present invention is not limited to this embodiment.

The steel plate for a curved conveyor frame of the present invention can be applied not only to a roller conveyor frame but also to various conveyor frames, and can be used for various types of steel plates having high bending strength such as H type, I type, T type, L type and Z type. It can be widely applied when bending into a shape having a curvature. As for the material to be bent, most of the conveyor frames are hot-rolled steel plates, aluminum, stainless steel, etc., but it can be applied to all ductile metals.

1 Curved Conveyor 2 Conveyor Roller 3 Outer Conveyor Frame 4 Inner Conveyor Frame 5 Outer Conveyor Frame Upper Bending Line 5'Outer Conveyor Frame Lower Bending Line 6 Inner Conveyor Frame Upper Bending Line 6'Inner Conveyor Frame Lower Bending Line 7 Outer Roller shaft bearing wall 8 Inner roller shaft bearing wall 9 Outer conveyor frame upper flange 9'Outer conveyor frame lower flange 10 Inner conveyor frame upper flange 10' Inner conveyor frame lower flange 11 Outer conveyor frame Roller shaft fitting Hole 12 Inner Conveyor Frame Roller Shaft Fitting Hole 13 Outer Conveyor Frame Upper Bending Post-Bending Stress Relaxing Hole 13'Outer Conveyor Frame Lower Bending Post-Bending Stress Relaxing Hole 14 Inner Conveyor Frame Upper Bending Post-Bending Stress Relaxing Hole 14'Inside After bending the lower part of the conveyor frame Stress relief hole 15 Outer conveyor frame Upper part After bending Tension-promoting convex part 15'Outer conveyor frame Lower part after bending Tension-promoting convex part 16 Inner conveyor frame Upper part After bending After bending Acceleration concave part 16'Inner conveyor Compression promotion recess after bending the lower part of the frame 17 Stress relief hole before bending the upper part of the outer conveyor frame (1)
17'Outer conveyor frame lower part Stress relaxation hole before bending (1)
18 Outer conveyor frame upper part pre-bending tension promotion convex part 18'Outer conveyor frame lower part pre-bending tension promotion convex part 19 Inner conveyor frame upper part pre-bending stress relaxation hole (1)
19'Inner conveyor frame lower part stress relaxation hole before bending (1)
20 Inner conveyor frame upper part pre-bending compression promotion recess 20'Inner conveyor frame lower part pre-bending compression promotion recess 21 Outer conveyor frame upper part pre-bending stress relaxation hole (2)
21'Outer conveyor frame lower part Stress relaxation hole before bending (2)
22 Stress relaxation hole before bending on the upper part of the inner conveyor frame (2)
22'Inner conveyor frame lower part stress relaxation hole before bending (2)
I, II Center line showing the positional relationship between the bending stress relaxation hole and the bending tension promoting convex part and compression promoting concave part.
III Bending promotion section spacing a Conveyor frame b, c Driven bottom roll d Stepped top roll e Top roll pressurizer R Curved radius of curvature

Claims (12)

It has a cross section formed in a groove shape by the upper flange portion, the shaft bearing wall portion, and the lower flange portion which are partitioned by a bending line and are continuous with each other, and the groove side of the groove shape is the longitudinal direction so as to be the tension side. Conveyor frame with curvature,
A plurality of bending stress relaxation means provided in a substantially row over a substantially total length in the longitudinal direction inside the upper flange portion and inside the lower flange portion at regular intervals in the longitudinal direction having the curvature.
Equipped with
The bending stress relaxation means is a means for shortening the processing time in roll bending.
An outer curve characterized by further comprising a plurality of bending tension promoting means provided on the same vertical line as the bending stress relaxation means at regular intervals on the outer side of the upper flange portion and the lower flange portion. Steel plate for conveyor frame. It has a cross section formed in a groove shape by the upper flange portion, the shaft bearing wall portion, and the lower flange portion which are partitioned by a bending line and are continuous with each other, and the groove side of the groove shape is the compression side in the longitudinal direction. Conveyor frame with curvature,
A plurality of bending stress relaxation means provided in a substantially row over a substantially total length in the longitudinal direction inside the upper flange portion and inside the lower flange portion at regular intervals in the longitudinal direction having the curvature.
Equipped with
The bending stress relaxation means is a means for shortening the processing time in roll bending.
An inner curve characterized by further comprising a plurality of bending compression promoting means provided on the same vertical line as the bending stress relaxation means at regular intervals on the outer side of the upper flange portion and the lower flange portion. Steel plate for conveyor frame. The steel plate for an outer curved conveyor frame according to claim 1, wherein a roller shaft fitting hole is formed in the shaft bearing wall portion. The steel plate for an inner curved conveyor frame according to claim 2, wherein roller shaft fitting holes are formed in the shaft bearing wall portion and the upper flange portion. The steel plate for an outer curved conveyor frame according to claim 1 , wherein the bending tension promoting means is a convex portion formed on the outer periphery of the conveyor frame. The steel plate for an inner curved conveyor frame according to claim 2 , wherein the bending compression promoting means is a concave portion formed on the outer periphery of the conveyor frame. By rolling the conveyor frame manufactured by bending the steel plate for the outer curved conveyor frame according to any one of claims 1, 3 and 5, the bending stress relieving means is before the roll bending. An outer curved conveyor frame characterized by having a shape different from the shape. By rolling the conveyor frame manufactured by bending the steel plate for the inner curved conveyor frame according to any one of claims 2, 4 and 6 , the bending stress relieving means is before the roll bending. An inner curved conveyor frame characterized by having a shape different from the shape. A frame provided at a curved portion of a conveyor, which is a flange portion protruding in the radial direction of the curve and includes a flange portion having an upper flange portion and a lower flange portion.
The flange portion includes a plurality of holes provided in the upper flange portion and the lower flange portion at equal intervals in a substantially row over substantially the entire length of the flange portion in the longitudinal direction, and the upper flange portion and the lower portion . A plurality of bending promotion portions provided on the same vertical line as the hole portion are provided on the outside of the side flange portion .
The conveyor frame is characterized in that the plurality of holes are for shortening the processing time in the roll bending process. The conveyor frame according to claim 9 , wherein the plurality of holes are provided at positions not in contact with the end of the flange portion at least at equal intervals within a certain range of bending radii of the curve. .. The conveyor frame according to claim 9 or 10 , wherein the conveyor frame is a conveyor frame provided on the outer peripheral side of the curve. By attaching two bending lines to the steel sheet, the steel sheet is divided into a continuous upper flange portion, a shaft bearing wall portion, and a lower flange portion.
A plurality of pre-bending stress relief holes are provided in the upper flange portion and the lower flange portion, and on the same vertical line as the bending stress relief hole portion outside the upper flange portion and the lower flange portion. A plurality of bending tension promoting portions are provided in substantially one row at substantially equal intervals over the substantially total length of the upper flange portion and the lower flange portion in the longitudinal direction.
Bending is performed with the above two bending lines.
The bent steel sheet is roll-bent and then rolled.
By the roll bending process, the stress relaxation holes before the roll bending process become the stress relaxation holes after the roll bending process, and the stress is relaxed by becoming the stress relaxation holes after the roll bending process. The flat shape of the part promotes tension ,
The outer curved conveyor frame manufacturing method, wherein the pre-bending stress relaxation hole portion shortens the machining time in roll bending.

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