JP2006027906A - Cast elastomer belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cast elastomer toothed belt hardly initiating a crack in a profile, easily bending a belt body at the stuck part of the profile and improved in meshing with a pulley. <P>SOLUTION: In this cast elastomer belt, the profile 3 is divided in an article conveying plate 7 and a reinforcing support plate 8 which are formed integrally with the belt body, and a space 9 is provided between the article conveying plate 7 and the support plate 8. An angle of the article conveying plate 7 to the back face of the belt body 2 is set to 60° to 120°, and an angle of the support plate 8 to the back face of the belt body 2 on the space 9 side is set to 30° to 60°. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cast elastomer belt, which is made of an elastomer material such as liquid polyurethane, and relates to a cast elastomer belt having an improved profile shape.

Conventionally, a belt having a profile on the back has a belt main body and a profile portion made of a thermoplastic resin, and the profile is heat-sealed to the belt main body. Cracks tended to occur between the belt and the profile. In other words, the bending stress applied to the profile during conveyance or the like tends to concentrate on the fused portion, and cracks occurred in a relatively short time.
In order to prevent the crack, the belt main body and the profile were made of cast elastomer, and a belt in which the belt main body and the profile were integrally formed was obtained. However, since this belt was integrally molded, the adhesive strength between the belt body and the profile was improved, and although it was certainly harder to crack as compared to the belt with the profile heat-sealed, it was still not sufficient. Therefore, as shown in FIG. 7, the conventional casting elastomer belt 31 is provided with an article conveying portion 37 and a support portion 38 for reinforcing the article conveying portion 37 to prevent cracks.

  However, as shown in FIG. 7, the profile article conveying portion 37 and the supporting portion 38 for reinforcing the profile are integrally filled with the casting elastomer, so that the belt main body 39 at the portion where the profile is fixed is bent. For this reason, as shown in FIG. 9, when engaged with the pulley, there is a problem in meshing with the pulley.

  The present invention is to improve such problems, and it is difficult to crack the profile, the belt body where the profile is fixed is easy to bend, and the cast elastomer tooth with good engagement with the pulley is provided. The purpose is to provide a belt.

That is, the present invention is a cast elastomer belt which is a toothed belt having a profile on the back surface, the belt including a tooth portion, a groove portion, and a back portion, and a core wire embedded in the back portion.
The profile is divided into an article transport plate and a support plate that reinforces the profile, and the article transport plate and the support plate are formed integrally with the belt body, and a space is provided between the article transport plate and the support plate. This is a cast elastomer belt in which the angle formed with the back surface of the belt body is 60 to 120 degrees and the angle formed with the back surface of the belt body on the space side of the support plate is 30 to 60 degrees.

  Further, according to the present invention, the angle between the article transport plate and the back of the belt body is approximately 90 degrees, and the angle between the support plate and the back of the belt body on the space side is approximately 45 degrees. Type elastomer belt.

According to the present invention, in the cast elastomer belt which is a toothed belt having a profile on the back surface, the belt is composed of a tooth portion, a groove portion and a back portion, and a core wire is embedded in the back portion,
The profile is divided into an article transport plate and a support plate that reinforces the profile, and the article transport plate and the support plate are formed integrally with the belt body, and a space is provided between the article transport plate and the support plate. The profile is fixed because it is a cast elastomer belt whose angle with the back of the belt body is 60 to 120 degrees and the angle with the back of the belt body on the space side of the support plate is 30 to 60 degrees. The belt main body in the portion where it is bent is easily bent, and the engagement with the pulley is improved. In addition, since the article conveying plate and the support plate having the above profile are integrally formed with the belt body, the profile is less likely to crack. Furthermore, the profile support plate can also support the force on average.

  In the invention according to claim 2, the angle between the article conveying plate and the back surface of the belt body is approximately 90 degrees, and the angle between the support plate on the space side and the back surface of the belt body is approximately 45 degrees. Since it is the cast elastomer belt according to Item 1, in addition to the effect of Claim 1, the support plate of the profile can support the force even more on average.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a side view of a cast elastomer belt of the present invention. Here, the profile 3 is divided into an article conveying plate 7 and a supporting plate 8, and a space 9 exists between the article conveying plate 7 and the supporting plate 8.
The article conveying plate 7 and the support plate 8 are integrally formed with the belt body 2.
Here, the angle α of the article conveying plate can be used in a range of 60 ° to 120 °, and is most preferably 90 °. The angle θ of the support plate 8 is usually 30 ° to 60 °, but 45 ° is preferable in order to support the force on average.

  Here, the casting elastomer belt 1 has a plurality of teeth 4 along the longitudinal direction of the belt, a back 6 in which a plurality of core wires 5 are arranged and embedded, and a profile 3 is integrally formed on the back 6. Yes.

The elastomer used for the tooth portion 4, the back portion 6 and the profile 3 is preferably a thermosetting polyurethane elastomer.
The core wire 5 may be any of polyester fiber, para-aramid fiber (trade name: Twaron, Kepler, Technora), metal fiber (wire) or glass fiber (E glass, high strength glass), and its configuration and thickness. It is not affected by the number of twists.

  FIG. 2 is a sectional view of a mold apparatus for producing a cast elastomer belt used in the present invention. According to this, the mold apparatus 10 of the present invention comprises an outer mold 11, an inner mold 12 to be inserted into the outer mold 11, and a profile molding mold 13 fixed to the outer mold 11. Between the inner mold | type 12, it has the space part 15 filled with casting elastomer. The inner die 12 is a die for a toothed belt provided with a groove extending in the axial direction, but may be a die having a flat outer peripheral surface.

  At least one profile molding die 13 is fixed to the outside of the outer die 11. The number of profile molding dies 13 can be appropriately changed depending on the number of profiles provided on the belt. The profile molding die is preferably fixed at a position where the outer die 11 is equally divided in the circumferential direction.

  The profile molding die 13 is usually composed of three plates having a predetermined thickness, but it is sufficient that at least one plate is formed. Further, the thickness of the plate varies depending on the belt width. Further, in the profile molding die, there is a space 3 having a profile shape as shown in FIG. The profile shape varies depending on the application and is not particularly limited. However, when an article is conveyed, a shape constituted by an article conveying unit and a support unit that reinforces the item is preferable.

  Further, the triangular block 21 shown in FIG. 5 is inserted into the profile molding die 13. FIG. 6 is a plan view showing a state in which the block 21 is inserted into the profile molding die 13. Here, by inserting the block 21 and fixing it in the profile molding die 13 with the positioning pins 17, the casting elastomer liquid does not flow into the block 21 portion, and the profile is formed by the block 21 after the casting elastomer belt molding. It is divided into the article conveyance part 7 and the support part 8 which reinforces it, and the part which inserted the block becomes space.

Specific examples of the present invention will be further described below.
First, an upper plate and a lower plate with a thickness of 15 mm, and an intermediate plate with a profile shape cut out with a thickness of 24.5 mm are laminated in the order of the upper plate, the middle plate, and the lower plate, and fixed with bolts, and then the profile forming gold The type. Further, the profile molding die was fixed to the outer die with a bolt.

  Next, the block was inserted into the profile molding die, positioned with a positioning pin, and fixed in the profile molding die. Furthermore, an inner mold in which a pair of S and Z twisted cords made of para-aramid fibers were spun at a predetermined tension was incorporated into an outer mold to which a profile molding mold was fixed.

  Next, the mold after the assembly is moved, decompressed and placed in a vacuum chamber, and a predetermined amount of liquid polyurethane raw material (prepolymer 100 parts by weight, 3,3′-dichloro 4) previously degassed through a hose. , 4′aminodiphenylmethane, 12 parts by weight of a curing agent and 20 parts by weight of a plasticizer). Thereafter, the liquid polyurethane was cured at various mold temperatures and times.

  After curing, the inner mold was lifted upward, and the inner mold was extracted from the outer mold fitted with the cast elastomer molded body, and then the positioning pins were removed, and the cast elastomer molded body was taken out together with the block. Thereafter, the block was removed from the cast elastomer molded body and cut into a predetermined width to obtain a cast elastomer belt. The obtained belt size was T10-25-120.

  In addition, as a conventional example, a cast elastomer belt was manufactured using the same mold, outer mold, and the same material as in the example without inserting a block into the space in the profile molding mold. Here, in the conventional example, the article conveyance part of the profile and the support part that reinforces it are integrally filled with the cast elastomer.

Next, the example and the conventional example were meshed with a pulley having 20 teeth of the T10 tooth type. The state is shown in FIGS. Here, FIG. 8 is a diagram showing the engagement state of the belt of the embodiment, and because there is a space between the article conveying plate of the profile and the support plate that reinforces it, both plates are bent and the engagement with the pulley is It is getting better.
FIG. 9 is a diagram showing the meshing state of the belt of the conventional example. Since the profile is filled with urethane, the rigidity of the profile becomes high, and the belt teeth at the base of the profile are difficult to bend. The effect of the present invention was confirmed without meshing with the teeth.

1 is a side view of a cast elastomer belt according to the present invention. 1 is a cross-sectional view of a mold apparatus for producing a cast elastomer belt according to the present invention. 1 is a plan view of a casting elastomer belt manufacturing mold apparatus according to the present invention. It is a top view of a metal mold for profile forming. It is a top view of the block inserted in the metal mold | die for profile shaping | molding. It is the figure which inserted the block in the metal mold | die for profile shaping | molding. It is a side view of the casting elastomer belt of a prior art example. It is the figure which mesh | engaged the casting elastomer belt of this invention with the pulley. It is the figure which meshed the cast elastomer belt of the prior art example with the pulley.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casting elastomer belt 2 Belt main body 3 Profile 4 Tooth part 5 Core wire 6 Back part 7 Article conveyance board 8 Support plate 9 Space 10 Mold apparatus 11 Outer mold 12 Inner mold 13 Profile molding die 17 Positioning pin 18 Article conveyance section 19 support part 20 pulley 21 block

Claims (2)

In the cast elastomer belt which is a toothed belt having a profile on the back surface, the belt is composed of a tooth portion, a groove portion and a back portion, and a core wire is embedded in the back portion,
The profile is divided into an article transport plate and a support plate that reinforces the profile, and the article transport plate and the support plate are formed integrally with the belt body, and a space is provided between the article transport plate and the support plate. A cast elastomer belt characterized in that the angle formed with the back surface of the belt body is 60 to 120 degrees, and the angle formed with the back surface of the belt body on the space side of the support plate is 30 to 60 degrees. The cast elastomer belt according to claim 1, wherein an angle formed between the back surface of the belt body of the article transport plate and the back surface of the belt body on the space side of the support plate is approximately 45 degrees.

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