JP4297256B2 - Conveyor belt manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rubber conveyor belt, preferably a rubber conveyor belt for carrying a person, and more specifically, a method for manufacturing a conveyor belt having a protruding portion that partially protrudes from a plate surface of a belt body. About.
[0002]
BACKGROUND OF THE INVENTION
2. Description of the Related Art Conventionally, a conveyer belt for transporting personnel is known in which a conveyor belt is looped between pulleys in an endless manner and is driven to rotate.
For example, Patent Document 1 below discloses this type of conveyor belt for conveying personnel.
[0003]
FIG. 8 shows a conveyor apparatus including a conveyor belt for conveying personnel disclosed in Patent Document 1, in which 200 is wound around an endless ring around a head pulley (drive pulley) 202 and a tail pulley (driven pulley) 204. 200C represents a conveyor belt made of rubber for transporting personnel, and 200C represents a transport side, and 200R represents a return side.
In the case of the conveyor belt 200 for conveying personnel, personnel are placed on the upper surface of the conveyor side 200 </ b> C, and personnel are conveyed as the conveyor belt 200 moves.
In the figure, reference numeral 206 denotes a support roller.
[0004]
By the way, in this kind of conveyer belt 200 for conveying personnel, a conveyor device for bending the conveyor belt 200 along a curve is considered, and in this case, a guide for bending the conveyor belt 200 along the set curve. A mechanism is needed.
As the guide mechanism, as shown in FIG. 9 (a), a guide rail 208 is laid along a set curve, while a guide roller 210 is protruded downward from the lower surface of the belt body 200A, and this guide rail is formed. A guide mechanism is envisaged for causing the conveyor belt 200 to move and bend by causing the conveyor belt 200 to rotate and abut against 208.
[0005]
In this case, it is necessary to provide a metal fitting (generally a flat metal fitting) 212 for attaching the guide roller 210 to the lower surface of the belt main body 200A.
As a mounting structure of the metal fitting 212, as shown in FIG. 9 (a), it is conceivable that the metal fitting 212 is embedded in the recess 214 of the belt main body 200A. If the belt is deformed when passing through the pulley or turning along a curve, the stress concentrates on the edge of the recess 214, particularly the corner portion, and the metal fitting 212 may be peeled off from the belt main body 200A from the same portion. .
[0006]
Normally, a core canvas for giving a tensile strength is embedded in the belt main body 200A, but these are omitted for convenience of explanation.
Reference numeral 213 denotes a wire that extends in the belt width direction and imparts lateral rigidity to the belt main body 200A.
[0007]
In order to avoid the above problem, as shown in FIG. 9B, a partial protrusion 216 is provided from the lower surface of the belt body 200A of the conveyor belt 200 to form a recess 214 there, and the recess 214 It is conceivable that the metal fitting 212 is provided in an embedded state.
That is, it is conceivable that the protruding portion 216 is constituted by the metal fitting 212 and the rubber portion 218 surrounding the outer periphery thereof.
[0008]
In such a case, even if the belt main body 200A is bent and deformed, the stress is relieved, and stress concentrates on the interface between the metal fitting 212 and the belt main body 200A so that the metal fitting 212 is peeled off from the belt main body 200A. Can solve the problem.
[0009]
By the way, when such a protrusion part 216 is provided in the belt main body 200 </ b> A, a manufacturing method of the conveyor belt 200, particularly a method for forming the protrusion part 216 poses a problem.
The present inventors tried the method shown in FIG. 10 as a method of manufacturing the conveyor belt 200 with such a protrusion 216.
[0010]
In FIG. 10A, reference numeral 220 denotes a molding die for the belt main body 200A, and recesses 222 having a shape corresponding to the protrusions 216 are provided at a predetermined pitch in the longitudinal direction.
In the manufacturing method of this example, the metal fitting 212 is set in each recess 222. At this time, the metal fitting 212 is held in a determined state by the pin 224 protruding into the recess 222.
When the metal fitting 212 is set in the recess 222, the filling rubber 218a formed into a thin rod shape is filled in the surrounding gap, and the gap around the fitting 212 is filled with the filling rubber 218a (in the figure, two examples are shown as the filling rubber 218a). Is shown).
[0011]
Thereafter, as shown in FIG. 10 (B), an unvulcanized belt body 200a, which has been formed in a long shape in advance, is placed on the mold 220, and the upper plate 228 and the lower plate 230 of the press device 226 are placed. Are closed together, and a portion of the belt body 200a over a predetermined range in the longitudinal direction is hot-press vulcanized.
Then, the same operation is sequentially performed in the longitudinal direction, and the entire long conveyor belt 200 is vulcanized.
[0012]
However, when this manufacturing method was tried, it was found that there were the following problems.
That is, in this manufacturing method, the stuffing operation of the stuffed rubber 218a must be performed manually by the operator. In this case, in the manufacturing process of the conveyor belt 200, the time required for the stuffing operation of the stuffed rubber 218a The required manufacturing time becomes longer, the cycle time for manufacturing the conveyor belt 200 becomes longer, the productivity is lowered, and as a result, the problem of increasing the cost arises.
[0013]
Moreover, in addition to the time-consuming work for filling the stuffed rubber 218a, it is difficult to cleanly fill the stuffed rubber 218a without any gaps. It was found that the rubber part 218 of the projecting part 216 was frequently confined and trapped 232, cracks 234, etc. as shown in FIG.
[0014]
Furthermore, there is a problem that the adhesive coating applied to the metal fitting 212 is damaged or soiled when the stuffing rubber 218a is stuffed, and the stuffing rubber 218a is stuffed by an appropriate amount. There is a problem that the amount of the stuffed rubber 218a needs to be controlled .
[0015]
Note conventional manufacturing method as far as the present inventors know for conveyor belts having such a projected portion is not provided.
[0016]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-68653
[Means for Solving the Problems]
The manufacturing method of the conveyor belt of the present invention has been devised against the background described above.
Method for producing Thus to claim 1, produced from a plate surface of the belt body partially projecting, forms a discontinuous longitudinal direction of the belt, the rubber conveyor belts having protrusions including a plate-shaped bracket a method, wherein the plate-shaped bracket and the rubber and the heat press vulcanization molding process unvulcanized the projecting portion and the composite integrated by cold pressure press molding Te preforming step odor set apart from the belt body It is characterized in that it is preformed in a state, and the preformed protrusion is integrally heat-press vulcanized together with the unvulcanized belt body in the heat-press vulcanization molding process of the belt body .
[0018]
The manufacturing method of claim 2 is characterized in that, in claim 1 , the protruding portion has a form in which a rubber portion surrounds an outer periphery of the flat metal fitting.
[0019]
A manufacturing method according to a third aspect of the present invention is the manufacturing method according to any one of the first and second aspects, wherein the conveyor belt is a curved belt that bends along a curve, and the metal fitting contacts a guide rail provided along the curve. It is for attaching a guide roller for moving and guiding in contact therewith .
[0020]
[Operation and effect of the invention]
As described above, according to the present invention, in the preforming process set separately from the heat press vulcanization molding process of the belt main body, the flat metal fitting is combined and integrated with the rubber by cold pressure press molding, and the protrusion is unvulcanized. This is a hot press vulcanization molding process as a main process, and this is hot-press vulcanized integrally with an unvulcanized belt body to produce a rubber conveyor belt. According to the invention, it is possible to satisfactorily prevent the occurrence of defects such as the above-described lacking or cracking in the rubber portion of the protruding portion.
[0021]
In the pre-forming process of the protrusion, it is easy to form an escape portion for excess rubber during press molding, and in this way, the air in the recess for molding escapes together with the rubber burr. By preventing the projecting part from generating defects such as thinning and cracking due to residual air or confinement when the projecting part is cold-pressed (preliminarily molded). Because you can.
[0022]
That is, it is difficult to provide such a surplus rubber relief in the large molding die for hot press vulcanization molding of the belt body shown in FIG. In contrast to the problem that the amount control is required and the filling work for filling the gaps uniformly into the gap takes time, the protruding portion is preliminarily prepared in a separate preforming process according to the present invention. When molding is performed, an excess amount of stuffed rubber is left over, and the excess part is released to the relief part to prevent the occurrence of thinning and cracking defects due to air contamination. The effect is that the amount of rubber is not required or simplified.
[0023]
Furthermore, according to the production method of the present invention, it is not particularly necessary to strictly pack the rubber so as not to contain air, and the rubber flows well during cold press molding. Since it fills the gaps evenly, it eliminates the problem that the packing rubber is difficult to pack, and the adhesive film applied to the metal fittings when packing the packing rubber. The problem of damaging or soiling can also be solved.
[0024]
In the conventional manufacturing method, since the upper surface of the projecting portion is the lower surface of the belt main body having elasticity, the rubber of the belt main body serves as a seal, and as a result, air is confined to cause a lack of thickness.
On the other hand, in the manufacturing method of the present invention, air easily escapes because the upper surface of the protrusion is in contact with the metal upper mold.
[0025]
Furthermore, in the present invention, since the preforming of the protrusion is performed in advance in a process separate from the heat press vulcanization molding process of the belt main body, which is the main process, in the hot press vulcanization molding process of the belt main body as the main process, The stuffing operation of the stuffed rubber in the comparative method shown in FIG. 10 can be eliminated.
This shortens the time required for the hot press vulcanization process of the belt body, shortens the conveyor belt manufacturing cycle time, and thus increases the productivity of the conveyor belt manufacturing, thereby reducing the manufacturing cost. Is possible .
[0026]
Or the present invention can be suitably applied to a case where the protruding portion forms a periphery to form surrounding the rubber portion of a flat plate (claim 2).
[0027]
The present invention also provides a method of manufacturing a conveyor belt, which is a curve belt that bends along a curve, and is provided with a fitting for mounting a guide roller that contacts and guides a guide rail provided along the curve. It is particularly suitable when applied to (Claim 3 ).
[0028]
The Ru suitably applicable der if the conveyor belt is for a personnel conveyor.
[0029]
In the present invention, the protruding portion protrudes from the lower surface of the belt main body, and a wire that extends in the belt width direction and gives lateral rigidity to the belt main body is embedded inside and below the belt main body and above the protruding portion. Ru suitably applicable der in the manufacture of conveyor belts formed by.
[0030]
【Example】
Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a rubber conveyor belt for transporting personnel, to which the manufacturing method of this example is applied, and 12 is a support roller for supporting this from the lower surface side.
Reference numeral 14 denotes a guide rail laid along a curve. A guide roller 16 projecting downward from the lower surface of the conveyor belt 10 is brought into contact with the guide rail 14, and the conveyor belt 10 is guided by the guide action. Will bend along the set curve.
[0031]
Here, the guide roller 16 has a rotating shaft 18 and a rotating body 20, and is fixedly attached to a lower surface of the conveyor belt 10 by a bolt 24 on a flat plate-like pedestal 22, specifically to a metal fitting 42 in a protruding portion 26 described later. It has become so.
[0032]
As shown in FIG. 2, the conveyor belt 10 includes a belt main body 10 </ b> A and a protruding portion 26 partially protruding from the lower surface thereof.
Here, the belt body 10 </ b> A has a laminated structure of an upper cover rubber 28, a lower cover rubber 30, and a core canvas 32.
[0033]
Further, wires 34 are embedded in the upper and lower sides of the core canvas 32 so as to extend in the belt width direction and to impart lateral rigidity to the conveyor belt 10.
The wire 34 substantially extends from one end to the other end in the width direction of the belt main body 10A.
On the other hand, the core canvas 32 is embedded in the central portion excluding the end portion in the width direction of the belt main body 10A.
[0034]
The upper cover rubber 28 is provided with protrusions 36 extending in the belt longitudinal direction on the upper surface thereof, and a groove 38 is formed between the protrusions 36 and 36.
[0035]
As shown in FIG. 1, the protrusions 26 are provided at two locations on one end side and the other end side of the belt main body 10A in the belt width direction.
These protrusions 26 are for attaching the guide roller 16, and the protrusions 26 are provided on one end side and the other end side in the belt width direction, so that the guide roller 16 can be attached to either of them. It is to do.
In this example, the guide roller 16 is attached only to one end on the left side in FIG.
[0036]
The protrusions 26 are also provided at a predetermined pitch in the belt longitudinal direction.
That is, these protrusions 26 are discontinuously and partially protrude in the belt width direction and in the belt longitudinal direction.
[0037]
As shown in FIG. 2, the protrusion 26 has a recess 40, and a flat metal fitting 42 serving as a mounting seat for the guide roller 16 is fixed thereto in an embedded state. A rubber portion 44 surrounds the outer peripheral portion of the metal fitting 42. That is, the protruding portion 26 includes a metal fitting 42 and a rubber portion 44.
Here, the metal fitting 42 is provided with a female screw hole 46 into which the bolt 24 is screwed.
Further, the base portion of the rubber portion 44 is an R surface (curved surface) 48.
[0038]
In the manufacturing method of this example, the protrusion 26 is previously unvulcanized in a preforming step set separately from the hot press vulcanization molding step of the preformed unvulcanized belt body 10a (see FIG. 6). The protrusion 26a is formed in advance, and is integrated with the belt main body 10A in the hot press vulcanization forming process of the belt main body 10a, which is the main process of manufacturing the conveyor belt 10.
[0039]
FIG. 3 shows a small molding die 50 used in the preforming process.
As shown in the figure, the molding die 50 is provided with a plurality of (eight in this case) molding recesses 52 for preforming the protruding portions 26a.
[0040]
Here, as shown in FIG. 4, the molding recess 52 is formed deeper than the plate thickness of the metal fitting 42 by Δh (here, 0.5 mm).
Each of the molding recesses 52 protrudes from a pin 56 that fits into the female screw hole 46 of the metal fitting 42 and positions the metal fitting 42.
The molding die 50 is provided with an escape portion 58 for escaping rubber flowing during the preliminary molding at the outer peripheral portion of each molding recess 52 so as to communicate with the molding recess 52.
[0041]
FIG. 5 shows a step of preforming the protruding portion 26a by cold pressure press molding using the molding die 50. As shown in FIG. The metal fitting 42 is inserted and set in each molding recess 52 in 50.
At this time, the metal fitting 42 is positioned and held at the correct set position by the pin 56.
In this preforming step, the filling rubber 60 filling the molding recess 52 together with the metal fitting 42 is set in the gap around the metal fitting 42 and the upper surface.
[0042]
In this state, as shown in FIG. 5 (II), this is pressed up and down by an upper board 64 and a lower board 66 in a small press device 62, and cold press molding is performed.
The temperature of the molding die 50 at this time is set to a low temperature of about 80 ° C.
The unvulcanized stuffed rubber 60 is not vulcanized by this cold press molding and is molded in the unvulcanized state.
Reference numeral 68 denotes a release paper (or cloth) stretched on the upper board 64.
[0043]
In the cold press molding as the pre-molding step, an excess amount is used as the stuffing rubber 60 more than necessary to fill the gap of the molding recess 52, and the stuffed rubber is pressed by the press pressure by the upper board 64 and the lower board 66. 60 smoothly pressurizes and flows in the molding recess 52, and the surplus portion escapes into the escape portion 58 provided around the molding recess 52 to generate a rubber burr therein.
At this time, the air in the molding recess 52 can also smoothly escape to the escape portion 58 along with the flow of the rubber, and the molded rubber portion 44a can be free from defects such as lack of rubber or cracks due to air accumulation. I will not give birth.
[0044]
FIG. 5 (III) shows the protrusion 26a that has been pre-molded in this way and in which the rubber portion 44a is in an unvulcanized state (after rubber burr removal).
As shown in the figure, the protruding portion 26a has a shape in which the outer peripheral portion of the metal fitting 42 is surrounded by the rubber portion 44a.
Further, a thin rubber film 70 is formed on the upper surface (lower surface in the drawing) of the metal fitting 42.
[0045]
FIG. 6 shows a hot press vulcanization molding process of the belt main body 10A.
In the figure, reference numeral 72 denotes a press device, 74 denotes an upper plate of the press device 72, and 76 denotes a lower plate.
In this hot press vulcanization molding process, the unvulcanized belt body 10a, which has been previously formed into a long shape, is sent to the press position and successively placed on the upper surface of the molding die 78 set at the press position. .
[0046]
As shown in FIG. 6, the unvulcanized protrusion 26 a formed in the pre-forming step is inserted and set in advance in the recess 80 of the molding die 78 before (on the upstream side) the press position. .
The recess 80 is also provided with a pin 82, and the pin 82 is inserted into the female screw hole 46 of the metal fitting 42 in the protrusion 26a, whereby the protrusion 26a is positioned and held at a predetermined position.
[0047]
In this example, a molding die 78 in which a preformed unvulcanized protrusion 26a is set is sent to the right in the figure together with a preformed unvulcanized belt body 10a, and the upper board 74 And the lower board 76, the upper board 74 and the lower board 76 are closed, and the belt body 10a is vulcanized there.
At this time, vulcanization is performed on the protruding portion 26a, and the protruding portion 26 is integrated with the belt main body 10A after vulcanization.
[0048]
Then, once the heat press vulcanization molding is performed, the upper board 74 is once lifted up, and the upstream mold dies 78 together with the preformed unvulcanized belt body 10a are shown in the right side of the figure. Then, hot press vulcanization is performed again by lowering the upper board 74 (here, the hot press conditions are 150 ° C. × 20 min, for example).
Thereafter, the same operation is performed one after another, and finally the long conveyor belt 10 is manufactured.
[0049]
According to the manufacturing method of the conveyor belt 10 of this example as described above, it is possible to satisfactorily prevent the occurrence of defects such as lacking or cracking in the rubber portion 44 in the protruding portion 26.
In addition, the effect of simplifying the amount management of the stuffed rubber 60 can be obtained.
[0050]
Further, in the manufacturing method of this example, it is not necessary to strictly pack the rubber 60 so as not to contain air, and the rubber flows well during the cold press molding so that the gaps are widened. Since it fills in evenly, it can solve the problems associated with the stuffing operation of the stuffed rubber 60, and also damages the adhesive film applied to the metal fitting 42 during the stuffing work of the stuffed rubber 60. The problem of getting dirty can also be solved.
[0051]
Furthermore, in the manufacturing method of the present example, the preforming of the protrusion 26a is performed in advance in a process separate from the hot press vulcanization molding process of the belt main body 10a, which is the main process, so the hot press vulcanization molding of the belt main body 10a is performed. The time required for the process can be shortened, and the cycle time for manufacturing the conveyor belt 10 can be shortened. As a result, the productivity of manufacturing the conveyor belt 10 can be increased, and the manufacturing cost can be reduced.
[0052]
FIG. 7 shows another embodiment of the present invention.
This example is an example in which the metal fitting 42 has a recess 84 on the lower surface. Even when the metal fitting 42 has such a complicated shape, according to the method of this example, the protruding portion 26 including the metal fitting 42 can be easily obtained. Can be manufactured integrally with the lower surface of the belt main body 10A.
[0053]
Above embodiments of the present invention have been described in detail, but this is merely an illustration and can be embodied with various modifications without departing from the scope of the present invention Waso.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a conveyor belt to which the present invention is applied.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a view showing a molding die for forming a protrusion used in the embodiment method of the present invention.
4 is a cross-sectional view taken along the lines A-A, E-I, and W-U of FIG. 3;
FIG. 5 is a diagram showing main processes of the method of the same embodiment.
FIG. 6 is a diagram showing a main process subsequent to FIG. 5;
FIG. 7 is a diagram showing main steps of another embodiment of the present invention.
FIG. 8 is a diagram of a conveyor apparatus including a conventionally known personnel conveying conveyor belt.
FIG. 9 is an explanatory view of a mounting structure of a guide roller as a guide mechanism and a malfunction thereof when a conveyor belt for transporting personnel is bent along a curve.
FIG. 10 is a comparative example showing an example of a method for manufacturing the conveyor belt of FIG.
FIG. 11 is an explanatory diagram of a problem of the manufacturing method of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Conveyor belt 10A, 10a Belt main body 14 Guide rail 16 Guide roller 26, 26a Protruding part 34 Wire 42 Metal fittings 44, 44a Rubber part 60 Stuffed rubber

Claims (3)

Partially protrude from a plate surface of the belt body, the belt longitudinal direction form a discontinuous, a manufacturing method of a rubber conveyor belts having protrusions including a plate-shaped bracket,
The plate-shaped metal piece and the rubber and the composite integrated by a cold-pressed molding Te preforming step odor set separately from the hot press vulcanization process of the belt body preforming the projecting portion in unvulcanized The method of manufacturing a conveyor belt, wherein the preformed protrusion is integrally heat-press vulcanized together with the unvulcanized belt body in a heat-press vulcanization molding process of the belt body. 2. The method of manufacturing a conveyor belt according to claim 1 , wherein the protruding portion has a shape in which a rubber portion surrounds an outer periphery of the flat metal fitting. The guide roller according to any one of claims 1 and 2 , wherein the conveyor belt is a curve belt that bends along a curve, and the metal fittings contact and guide a guide rail provided along the curve. A method for manufacturing a conveyor belt, characterized in that it is for mounting.

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