JP2008224510A - Evaluation method of rubber material for conveyor belt, and injection device used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaluation method of a rubber material for a conveyor belt capable of evaluating simply durability of the rubber material for the conveyor belt, and matching an evaluation result with durability of the actual conveyor belt, and an injection device used therefor. <P>SOLUTION: Since evaluation is performed by using a test piece B, the durability of the rubber material for the conveyor belt can be evaluated simply. Particle materials A are injected as long as a prescribed time toward the test piece B comprising the rubber material for the conveyor belt, and the durability of the rubber material is evaluated based on a reduced weight of the test piece B by injection of the particle materials A, and thereby when the particle materials A collide onto the surface of the test piece B, a great impact force is applied to the surface of the test piece B, and the impact force is applied in a plurality of times, to thereby abrade the surface of the test piece B. Namely, abrasion similar to the case where the actual conveyor belt is abraded can be generated on the test piece B, and matching with the durability of the actual conveyor belt becomes possible. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an evaluation method for evaluating the durability of a rubber material used for a conveyor belt and an injection device used therefor.

  In general, as a method for evaluating this type of rubber material, a test piece made of a rubber material is pressed against a cylindrical member having a polishing cloth wound around its outer peripheral surface, and the cylindrical member is rotated by a predetermined number of times. A DIN wear test for measuring the amount of wear is known (for example, see Patent Document 1).

Other rubber material evaluation methods include a test conveyor belt, a pair of rollers that support the test conveyor belt from the inner peripheral surface side, and a presser that is pressed against the test conveyor belt supported by each roller. Are used to measure the amount of wear of the test conveyor belt by pressing the presser onto the test conveyor belt a plurality of times while rotating the test conveyor belt by each roller (for example, (See Patent Document 1).
JP 2004-20319 A

  By the way, when ore or coke is transported, when the ore or coke falls on the conveyor belt, a large impact force is applied to the surface of the conveyor belt, and the impact force is applied multiple times. The belt surface wears.

  However, in the former evaluation method, since the test piece made of a rubber material is pressed against the outer peripheral surface of the cylindrical member and the cylindrical member is rotated, the direction along the surface of the test piece mainly on the surface of the test piece. The force in the direction different from that when ore or coke falls on the conveyor belt is applied. For this reason, there has been a problem that the evaluation result does not match the durability of the actual conveyor belt.

  In the latter evaluation method, the test results are consistent with the durability of the actual conveyor belt because the presser is pressed against the test conveyor belt multiple times while rotating the test conveyor belt with each roller. However, since it is necessary to manufacture a conveyor belt for testing in order to perform the evaluation, there is a problem that it takes time for the evaluation.

  The present invention has been made in view of the above problems, and the object of the present invention is to easily evaluate the durability of rubber materials for conveyor belts, and to evaluate the evaluation results of the durability of actual conveyor belts. It is an object of the present invention to provide a method for evaluating a rubber material for a conveyor belt, which can be matched with the properties, and an injection device used therefor.

  In order to achieve the above object, the method for evaluating a rubber material for a conveyor belt according to the present invention is a test in which a granular material is sprayed for a predetermined time toward a test piece made of a rubber material for a conveyor belt and reduced by the injection of the granular material. The durability of the rubber material for the conveyor belt is evaluated based on the weight of the piece.

  Thereby, since it evaluates using a test piece, durability evaluation of the rubber material for conveyor belts can be performed easily. Also, since the granular material is sprayed for a predetermined time toward the test piece made of rubber material for conveyor belt, and the durability of the rubber material is evaluated based on the weight of the test piece reduced by the injection of the granular material, the test piece When a particulate matter collides with the test piece, a large impact force is applied to the surface of the test piece, and the impact force is applied a plurality of times, whereby the surface of the test piece is worn.

  In addition, the present invention includes a support member that supports a test piece made of a rubber material for a conveyor belt, and an injection nozzle that injects the granular material toward the test piece supported by the support member, and is reduced by the injection of the granular material. This is an injection device used for evaluating the durability of rubber materials for conveyor belts based on the weight of the test piece, and the angle formed by the injection direction of the granular material by the injection nozzle and the surface of the test piece can be set to approximately 90 °. It is configured.

  Thus, the test piece is provided with a support member for supporting the test piece made of the rubber material for the conveyor belt, and an injection nozzle for injecting the granular material toward the test piece supported by the support member, and reduced by the injection of the granular material. This is a jetting device used to evaluate the durability of rubber materials for conveyor belts based on the weight of the conveyor belt. Since the evaluation is performed using test pieces, the durability of rubber materials for conveyor belts can be easily evaluated. it can. Further, when a particulate matter collides with the test piece, a large impact force is applied to the surface of the test piece, and the impact force is applied a plurality of times, so that the surface of the test piece is worn. Furthermore, since the angle formed by the injection direction of the granular material by the injection nozzle and the surface of the test piece can be set to approximately 90 °, when ore or coke falls on the conveyor belt substantially vertically, An impact force similar to the impact force applied to the surface can be applied to the surface of the test piece.

  According to the method for evaluating a rubber material for a conveyor belt of the present invention, when a particulate matter collides with the surface of the test piece, a large impact force is applied to the surface of the test piece, and the impact force is applied multiple times. Since the surface of the test piece is worn, the same wear as when the actual conveyor belt is worn on the test piece can be generated, and the evaluation result can be matched with the durability of the actual conveyor belt.

  Further, according to the injection device of the present invention, when ore or coke falls on the conveyor belt substantially vertically, an impact force similar to the impact force applied to the surface of the conveyor belt can be applied to the surface of the test piece. Therefore, it is extremely advantageous to match the evaluation result with the actual durability of the conveyor belt.

  FIG. 1 to FIG. 3 show an embodiment of the present invention. FIG. 1 is a schematic front view of an injection device, FIG. 2 is a front view of a main portion of the injection device, and FIG.

  The injection device includes an injection nozzle 10 that injects the granular material A downward, a granular material supply device 20 that supplies the granular material A to the injection nozzle 10, and a compressed air supply device that supplies compressed air to the injection nozzle 10. 30, a support member 40 that supports the test piece B below the injection nozzle 10, and an injection chamber 50 that stores the injection nozzle 10 and the support member 40.

  The granular material A is composed of carbon particles having a particle diameter (particle diameter) of 0.5 mm to 1.5 mm.

  The test piece B is made of a rubber material for a conveyor belt and is formed in a flat plate shape.

  The injection nozzle 10 is formed in a cylindrical shape extending in the vertical direction, and the diameter D of the injection port 10a provided at the lower end is several mm. An air nozzle 11 is opened in the injection nozzle 10, and the air nozzle 11 discharges compressed air downward. The granular material A is supplied from the granular material supply device 20 into the injection nozzle 10, and the granular material A supplied into the injection nozzle 10 is injected downward from the injection port 10 a by the compressed air discharged from the air nozzle 11. Further, the position of the injection nozzle 10 can be arbitrarily set by a moving mechanism (not shown).

  The granular material supply device 20 can supply the granular material A into the injection nozzle 10 by a predetermined amount. Further, the granular material A injected into the injection chamber 50 returns to the granular material supply device 20 again.

  The compressed air supply device 30 is composed of a known compressor, and supplies compressed air of 0.5 MPa, for example, to the air nozzle 11.

  The support member 40 includes a base 41 that fixes the test piece B, and an arm 42 that is fixed to the lower surface of the base 41. A holding mechanism (not shown) is provided on the base 41, and the holding mechanism holds the test piece B on the base 41. The arm 42 is attached to the bottom surface of the injection chamber 50 with a bolt 43. The arm 42 is provided with a long hole 42a through which the bolt 43 is inserted, and an angle α formed by the injection direction of the granular material A by the injection nozzle 10 and the upper surface of the test piece B can be arbitrarily set.

  The injection chamber 50 is provided with an openable / closable door (not shown), and the inside of the injection chamber 50 is sealed by closing the door.

  When evaluating the rubber material for conveyor belts using the evaluation apparatus configured as described above, first, the weight of the test piece B is measured, and then the test piece B is supported by the support member 40. Next, the angle α formed by the support member 40 between the injection direction of the granular material A and the upper surface of the test piece B is set to approximately 90 °, and the lower end of the injection port 10a in the injection nozzle 10 and the upper surface of the test piece B are set. The distance L is set to a predetermined distance (for example, 100 mm), and the door of the ejection chamber 50 is closed. Subsequently, the particulate matter A is ejected from the ejection nozzle 10 toward the test piece B on the support member 40 for a predetermined time, and after the ejection of the particulate matter A from the ejection nozzle 10 is finished, the door of the ejection chamber 50 is opened. The test piece B is taken out and the weight of the test piece B is measured. Subsequently, the volume change amount of the test piece B reduced by the injection of the granular material A is calculated from the weight of the test piece B reduced by the injection of the granular material A. Thus, by calculating the volume change amount for a plurality of types of rubber materials, the durability of each rubber material can be relatively evaluated.

  Thus, according to the evaluation method of the rubber material for conveyor belts of this embodiment, since evaluation is performed using the test piece B, the durability of the rubber material for conveyor belts can be easily evaluated. In addition, the granular material A is sprayed for a predetermined time toward the test piece B made of the rubber material for the conveyor belt, and the durability of the rubber material is evaluated based on the weight of the test piece B reduced by the injection of the granular material A. Therefore, when the granular material A collides with the surface of the test piece B, a large impact force is applied to the surface of the test piece B, and the surface of the test piece B is worn by applying the impact force a plurality of times. That is, it is possible to cause the test piece B to wear the same as when the actual conveyor belt is worn, and to match the evaluation result with the durability of the actual conveyor belt.

  FIG. 3 shows the results of evaluation of the rubber material 1 and the rubber material 2 in the DIN abrasion test and this embodiment, and the durability of the rubber material 1 and the rubber material 2 manufactured by manufacturing an actual conveyor belt. In the DIN abrasion test, a test piece made of a rubber material is pressed against a cylindrical member around which an abrasive cloth is wound, and the volume of the test piece is measured by rotating the cylindrical member a predetermined number of times. It is. As shown in FIG. 3, although the evaluation result of the DIN wear test and the durability of the actual conveyor belt do not match, the evaluation result of this embodiment and the durability of the actual conveyor belt match.

  Further, when carbon particles are used as the granular material A, the carbon particles and coke are similar in material, and therefore the evaluation result tends to match the durability of the conveyor belt that conveys the coke. Furthermore, when carbon particles having a particle size of 0.5 mm or more and 1.5 mm or less are used as the granular material A, the evaluation results tend to be more consistent with the durability of the conveyor belt that conveys coke.

  In addition, since the angle formed by the injection direction of the granular material A and the upper surface of the test piece B is set to approximately 90 °, the surface of the conveyor belt when ore or coke falls substantially vertically on the conveyor belt. An impact force similar to the impact force applied to the test piece B can be applied to the upper surface of the test piece B, which is extremely advantageous in matching the evaluation result with the durability of the actual conveyor belt.

  Moreover, according to the injection apparatus of this embodiment, since the angle α formed by the injection direction of the granular material A by the injection nozzle 10 and the upper surface of the test piece B can be set to approximately 90 °, the ore is provided on the conveyor belt. Impact force similar to the impact force applied to the surface of the conveyor belt when a coke or coke falls substantially vertically can be applied to the upper surface of the test piece B, and the evaluation result is matched with the actual durability of the conveyor belt. Is very advantageous.

  In the present embodiment, the angle α formed by the injection direction of the granular material A by the injection nozzle 10 and the upper surface of the test piece B is approximately 90 °. However, the angle α may be approximately 45 °. It is possible and other angles are possible.

  Moreover, in this embodiment, although the test piece B showed what formed the rubber material for conveyor belts in flat form, a part of actual conveyor belt was cut off and the part cut out is used as the test piece B. It is also possible.

The schematic front view of the injection device which shows one Embodiment in this invention Front view of main parts of injection device Graph showing example evaluation results

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Injection nozzle, 10a ... Injection nozzle, 11 ... Air nozzle, 20 ... Granular substance supply apparatus, 30 ... Compressed air supply apparatus, 40 ... Support member, 41 ... Base, 42 ... Arm, 42a ... Long hole, 43 ... Bolt, 50: injection chamber, A: granular material, B: test piece.

Claims (5)

It is characterized in that the granular material is sprayed for a predetermined time toward the test piece made of the rubber material for the conveyor belt and the durability of the rubber material for the conveyor belt is evaluated based on the weight of the test piece reduced by the injection of the granular material To evaluate rubber materials for conveyor belts. Carbon particles are used as the granular material. The method for evaluating a rubber material for a conveyor belt according to claim 1. The method for evaluating a rubber material for a conveyor belt according to claim 1, wherein carbon particles having a particle size of 0.5 mm or more and 1.5 mm or less are used as the granular material. The method for evaluating a rubber material for a conveyor belt according to claim 1, 2 or 3, wherein an angle formed between the injection direction of the granular material and the surface of the test piece is set to approximately 90 °. A support member for supporting a test piece made of rubber material for a conveyor belt, and an injection nozzle for injecting the granular material toward the test piece supported by the support member, the weight of the test piece being reduced by the injection of the granular material. A jetting device used for evaluating the durability of rubber materials for conveyor belts based on
An injection apparatus characterized in that the angle formed by the injection direction of the granular material by the injection nozzle and the surface of the test piece can be set to approximately 90 °.

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