JP2019031366A - Conveying belt and method for producing conveying belt - Google Patents

Abstract

To provide a conveying belt capable of enhancing a frictional force on a surface of the conveying belt without using a conventional high friction cloth.SOLUTION: A conveying belt (3) includes a belt body (31) on which an article is mounted, and a fluororesin layer (33) provided on a surface of the belt body (31) on which the article is mounted. A method for producing the conveying belt (3) includes the steps of: molding the belt body (31) by a thermoplastic resin; adhering tightly a sheet (6) comprising a fluororesin to one surface of the belt body (31) in molding the belt body (31) to transfer the fluororesin on the surface of the belt body (31), and integrally molding the belt body (31) and the fluororesin layer; and peeling the sheet (6) after molding.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a conveying belt for placing and conveying an object and a method for manufacturing the conveying belt.

Belt conveyors that convey objects are used in all fields. The conveyor belt of the belt conveyor is made of, for example, plastic having elasticity, and a core material for increasing the strength is embedded therein. Teeth are formed on one surface of the conveyor belt, and these teeth are meshed with the pulley, so the conveyor belt can be moved by rotating the pulley, and the object placed on the conveyor belt can be moved. Can be transported. (For example, refer to Patent Document 1).
When transporting a light object, transporting an object at high speed, or transporting an object with the transport belt tilted, the object is transported because the frictional force between the object and the surface of the transport belt is not sufficient. There is a risk of slipping on the belt. In view of this, a conveyor belt is used in which a high-friction cloth that increases the frictional force is attached to the surface of the conveyor belt to increase the frictional force with an object so that stable conveyance can be performed.

Japanese Patent No. 4701950

  However, the high friction cloth may be peeled off from the conveyor belt due to contact with the object to be conveyed. Further, since the conveying belt becomes thicker by the thickness of the high friction cloth, the pulley can be reduced in size. In addition, it takes time and effort to attach the high friction cloth to the conveyor belt, resulting in a reduction in work efficiency.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a conveyor belt and a conveyor belt manufacturing method with an increased surface friction force without using a conventional high friction cloth. To do.

  In order to achieve the above object, a transport belt according to the present invention includes a belt main body on which an article is placed, and a fluororesin layer provided on a placement surface of the article in the belt main body. .

  Moreover, it is preferable that the said belt main body is formed with the thermoplastic resin.

  The thermoplastic resin is preferably polyurethane.

  The fluororesin layer is preferably made of polytetrafluoroethylene.

  In order to achieve the above object, a method for manufacturing a transport belt according to the present invention includes a step of forming a belt body with a thermoplastic resin, and a sheet made of a fluororesin is formed when the belt body is formed. A step of transferring the fluororesin on the surface to the belt main body in close contact with one surface of the belt main body, and forming the belt main body and the fluororesin layer integrally; and a step of peeling the sheet after molding. It is characterized by.

  According to the present invention, the frictional force on the surface can be increased without using a conventional high-friction cloth.

It is a perspective view which shows the outline of the belt conveyor with which the conveyance belt was wound around the pulley. FIG. 4 is a cross-sectional view of a part of a conveyor belt. It is a perspective view which shows the outline of the extrusion molding machine of a conveyance belt. It is a roughness curve which shows the surface roughness of the mounting surface of the thing in a conveyance belt. It is a roughness curve which shows the surface roughness when a fluororesin layer is formed in the mounting surface of the thing in a conveyance belt.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Conveyor belt>
The configuration of the conveyor belt will be described.
As shown in FIG. 1, a belt conveyor 100 that conveys an object such as a substrate or a glass plate includes a pulley 1 and a conveyor belt 3.
The pulley 1 includes a main pulley 11 and a driven pulley 12. For example, the main pulley 11 is provided at both ends of the rotating shaft 21 connected to a motor (other actuator may be omitted). That is, when the rotating shaft 21 rotates around the axis by driving the motor, the main pulley 11 also rotates around the axis. The driven pulley 12 is provided, for example, at both ends of the rotating shaft 22 that is spaced apart from the rotating shaft 21 and arranged in parallel. The driven pulley 12 is rotated about its axis as the rotation of the driven pulley 11 is transmitted through the conveyor belt 3 spanned between the driven pulley 11 and the driven pulley 12.
Both the main pulley 11 and the driven pulley 12 are formed with teeth 11 a and 12 a at the same pitch on the outer peripheral surface, and mesh with the teeth 31 a formed on the inner surface of the conveyor belt 3.

As shown in FIG. 2, the transport belt 3 includes a belt main body 31, a fluororesin layer 33, and a core material 35.
As shown in FIGS. 1 and 2, the belt main body 31 is formed in an endless shape, and is stretched over the pulley 1. In the belt main body 31, an object to be conveyed is placed on the surface (mounting surface) opposite to the surface (inner surface) that spans the pulley 1. The belt main body 31 has teeth 31a meshing with the teeth 11a and 12a of the pulley 1 on the inner surface at the same pitch as the teeth 11a and 12a of the pulley 1 over the entire circumference. The mounting surface of the belt body 31 is formed flat.
The belt body 31 is made of a thermoplastic resin, for example, polyurethane. The thermoplastic resin is not limited to polyurethane, but a general-purpose plastic such as polyethylene (PE) or polypropylene (PP), or a super engineering plastic such as polytetrafluoroethylene (PTFE) or polyetheretherketone (PEEK). It may be used.

  As shown in FIG. 2, the fluororesin layer 33 is formed on the object placement surface of the belt body 31. The fluororesin layer 33 is formed over the entire mounting surface of the belt main body 31. The fluororesin layer 33 is made of, for example, polytetrafluoroethylene (PTFE). The fluororesin that forms the fluororesin layer 33 is not limited to polytetrafluoroethylene (PTFE), but may be perfluoroalkoxy fluorine as long as it increases the contact area with the conveyed object and increases the frictional force. Resin (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), or the like may be used.

As shown in FIG. 2, the core material 35 reinforces the belt main body 31 and is embedded in the belt main body 31. The core material 35 is embedded in parallel to the fluororesin layer 33 between the teeth 31 a formed on the inner surface of the belt main body 31 and the object placement surface.
For the core material 35, for example, a steel wire rope, a steel net, a woven fabric, or the like is used to increase the strength of the belt body 31. The core material 35 is not limited to a linear shape, and may be a net shape or a plate shape.

<Conveyor belt manufacturing equipment>
Next, the manufacturing apparatus of a conveyance belt is demonstrated.
As shown in FIG. 3, the conveyor belt 3 is manufactured by an extruder 5.
The extrusion molding machine 5 includes a gear-shaped cast wheel 51 serving as an inner mold, a belt mechanism 53 serving as an outer mold, and a nozzle 55 that discharges a molding material.
The pattern wheel 51 is a gear-shaped member having teeth 51a formed on the outer peripheral surface. Here, the pitch of the teeth 51 a is formed to be the same as the pitch of the teeth 31 a of the belt main body 31, and serves as an inner mold for molding the belt main body 31.
The belt mechanism 53 includes three pulleys 53a, 53b, and 53c, and an endless belt 54 that spans the pulleys 53a, 53b, and 53c, and the belt 54 forms an outer mold that forms the belt main body 31. As a role.
Therefore, a gap between the model wheel 51 and the belt 54 becomes a cavity for molding the belt main body 31.

<Conveying belt manufacturing method>
Next, the manufacturing method of the conveyance belt 3 using the extrusion molding machine 5 is demonstrated.
While rotating the mold wheel 51 and the belt 54 in the direction of the arrow in the drawing, polyurethane, which is a molding material of the belt main body 31, is discharged from the nozzle 55 into a cavity formed between the mold wheel 51 and the belt 54. To go. Further, the core material 35 and the sheet 6 are inserted into the cavity together with the discharge of the polyurethane.

Here, the sheet 6 is a release sheet formed from a fluororesin, and the fluororesin layer 33 is formed on the belt main body 31 by transferring the fluororesin on the surface to the mounting surface of the molded belt main body 31. be able to.
The core material 35 is inserted so as to be buried in the polyurethane, and the sheet 6 is inserted between the polyurethane and the belt 54, that is, so that the sheet 6 contacts the belt 54.

The polyurethane discharged from the nozzle 55 is sandwiched between the model wheel 51 and the belt 54 and formed as a belt main body 31. When the belt main body 31 is formed, the core material 35 is embedded in the belt main body 31, and the belt main body 31 is embedded. When the sheet 6 is brought into close contact with one surface of the belt 31, the surface of the sheet 6 is transferred to the mounting surface of the belt body 31, and the conveyance belt 3 in which the fluororesin layer 33 is integrally formed is formed.
Here, after forming the conveyor belt 3, the conveyor belt 3 is released from being sandwiched between the pattern wheel 51 and the belt 54, and the sheet 6 made of fluororesin that does not adhere to polyurethane is peeled off from the belt body 31.
The formed conveyance belt 3 is cut into a predetermined length according to the application, and the end portions of the conveyance belt 3 are bonded to each other to produce the endless conveyance belt 3.

As described above, the conveyance belt 3 is formed by interposing the sheet 6 made of fluororesin on the mounting surface side of the belt main body 31 so that the state of the surface of the sheet 6 having almost no unevenness on the surface is the belt main body 31. As a result, the fluororesin layer 33 is formed, so that minute irregularities on the mounting surface of the belt body 31 are leveled. Therefore, as shown in FIG. 5, the surface roughness of the mounting surface of the belt main body 31 can be reduced. 4 is a graph of a roughness curve obtained by measuring the surface roughness of the belt main body 31 (polyurethane), and FIG. 5 is a fluororesin layer 33 (polytetrafluorocarbon) formed on the mounting surface of the belt main body 31. It is a graph of a roughness curve obtained by measuring the surface roughness of (fluoroethylene), and it can be seen that the surface roughness is reduced by forming the fluororesin layer 33. Thereby, a contact area with a conveyed product can be increased, and a friction coefficient equivalent to the conventional high friction cloth (about 1.7 times the friction coefficient of the belt main body 31) can be ensured.
Therefore, there is no need to attach a high friction cloth to the placement surface of the belt main body 31 as in the prior art, and there is no possibility that the high friction cloth is peeled off from the belt main body 31 due to contact with the conveyed product. Furthermore, since the conveyed product becomes difficult to shift by increasing the frictional force, the conveying speed can be increased.

Further, since the conveying belt 3 does not become thicker by the thickness of the high friction cloth, the size reduction of the pulley 1 is not restricted, and it is not necessary to change the minimum number of teeth of the pulley 1.
In addition, since the process of attaching the high friction cloth to the belt main body 31 is not required, the work efficiency is not lowered in the manufacture of the conveyor belt 3.
Further, the cost can be reduced as compared with the high friction cloth.
Further, since the fluororesin layer 33 can be formed on the belt main body 31 together with the molding of the belt main body 31 by the extrusion molding machine 5 in the manufacture of the conveyor belt 3, a mold and equipment for forming the fluororesin layer 33. Etc. are not required, and the production of a small lot is also possible without increasing the cost.
Further, in the manufacture of the conveyor belt 3, the sheet 6 is made of a fluororesin, so that it does not adhere to the polyurethane of the belt main body 31 and is peeled off from the belt main body 31 by its own weight.

<Others>
The present invention is not limited to the above embodiment. For example, the conveyance belt is not limited to extrusion molding, and may be manufactured by other molding methods such as cast molding.

DESCRIPTION OF SYMBOLS 1 Pulley 3 Conveyor belt 5 Extruder 6 Sheet 31 Belt main body 33 Fluororesin layer 35 Core material 100 Belt conveyor

Claims (5)

A belt body on which objects are placed;
A fluororesin layer provided on the mounting surface of the belt body,
A conveyor belt comprising:   The conveyor belt according to claim 1, wherein the belt body is formed of a thermoplastic resin.   The conveyor belt according to claim 2, wherein the thermoplastic resin is polyurethane.   The conveyor belt according to claim 1, wherein the fluororesin layer is made of polytetrafluoroethylene. Forming a belt body with a thermoplastic resin;
When molding the belt body, a sheet made of fluororesin is brought into close contact with one surface of the belt body to be molded, and the surface fluororesin is transferred to the belt body, and the belt body, the fluororesin layer, A process of integrally molding,
Removing the sheet after molding;
A method for producing a conveyor belt, comprising:

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