JPS6221610A - Tester for travelling of conveyer belt - Google Patents

Abstract

PURPOSE:To facilitate the optimum design of transverse rigidity of a conveyer belt by incorporating an axial load cell in a trough carrier roller to be vertically moved. CONSTITUTION:Axial load cell system rollers to which strain gauges a-f are applied are incorporated in shafts of respective carrier rollers 17-19 of a trough carrier roller 6 to measure loads applied to the rollers 17-19 through a belt 8. And on the basis of the measuring result are vertically moved the roller 6 by driving a ball screw 13 through a lifting motor 16 and a bevel gear 15 along a slide rail 14 to change the positions of the carrier rollers 5-7 and properly set convex angle changing points of a conveyer belt 8. By this constitution is facilitate the optimum design of transverse rigidity of the belt.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a running test machine for conveyor belts, and more specifically, it measures the stress distribution in the width direction in the trough portion of the conveyor belt, and measures the lateral rigidity of the conveyor belt. This invention relates to a running test machine for conveyor belts that enables optimal design.

(Prior Art) Knowing the rigidity of a conveyor belt is one of the very important things in belt design.

However, the longitudinal direction of the conveyor belt (belt traveling direction)
The stiffness of the belt can be easily measured by a tensile test, etc. However, even if there is a tensile test or a static suspension test (ISO703), it is not possible to measure the stiffness in the lateral direction (belt width direction). It does not lead to dynamic evaluation and is still insufficient.

This is particularly noticeable when the conveyor belt is run in a trough, and if the belt's lateral rigidity is small and soft, the belt (31) will move around the trough carrier roller (32) as shown in FIG. 4(A). ) between the carrier rollers, the inner edges of the rollers damage the belt, resulting in premature service life. o) As shown in (++), the heald shifts in the width direction and swells in the center, and if this progresses, the belt folds in the width direction, causing a problem that the load cannot be carried.

On the other hand, if the lateral rigidity of the belt is too large, the belt (31) will not be able to handle the trough carrier roller (3) as shown in Fig. 4(d).
2) A phenomenon in which the belt lifts up more partially occurs, resulting in the belt meandering and causing the problem that stable transportation cannot be achieved.

(Problems to be Solved by the Invention) As mentioned above, the lateral stiffness of conveyor belts for conventional trough conveyors and for trough conveyors with convex angular displacement points can be determined by tensile tests or static suspension tests. However, since the design of the lateral rigidity was based on experience, the lateral rigidity of the belt often changed during actual machine running, making it extremely difficult to achieve an optimal design.

The present invention overcomes the difficulties based on the above-mentioned actual situation, and by providing the conveyor belt with design conditions that match the actual usage conditions, it is possible to conduct a running test that makes it possible to measure the stress distribution in the belt width direction. The purpose is to provide a machine.

(Means for Solving the Problems) That is, the present invention is characterized by a conveyor belt suspended between a pair of driving pulleys and a driven pulley attached to a frame support. In a running test machine for a conveyor belt in which one or more sets of trough carrier rollers are provided on the acid heald conveyance side and a driven pulley is movable, at least one set of the trough carrier rollers is attached to each roller axis. The main feature is that it incorporates an axial load cell and can be raised and lowered in the vertical direction.

(Function) When using the running test machine constructed as described above, first, the trough carrier roller, which can be raised and lowered and which has an integrated axial load cell, is moved upward to apply the required tension to the conveyor belt and the required trough angle. give.

By driving the drive roller and detecting the stress generated on the shaft of the axial load cell type roller using a strain gauge attached to the shaft, the carrier roller load applied to each carrier roller via the belt, especially at the trough portion, is detected. Measure the load distribution on the conveyor belt.

In this way, according to the obtained load distribution, it is possible to quantitatively optimally design the belt lateral stiffness based on this.

(Example) Hereinafter, specific embodiments of the present invention will be further described in detail based on the accompanying drawings.

FIG. 1 shows an embodiment of the conveyor belt running test machine according to the present invention. In the figure, (1) is a frame support, and the frame support (1) is connected to a motor (4). A pair of rollers, a driving pulley (3) and a driven pulley (2), are attached, and a conveyor belt (
8) is suspended, and three sets of trough carrier rollers +51 and +61 (?) are respectively arranged on the belt conveyance side between them, and the conveyor belt (8) suspended between both pulleys runs in a trough shape. It is configured like this.

In this case, the conveyor belt (8)
For example, the tension is applied by the hydraulic cylinder (9) to the bearing (11) of the driven boot 2) via the tension detection load cell 00), and the bearing (11) is applied to the frame (11).
Upper and lower slide rails (12) (12)
The tension can be set to any value by freely moving between the two and controlling the hydraulic pressure of the hydraulic cylinder (9), and the initial tension and tension fluctuation can be controlled by the load needle (not shown) attached to the driven pulley. has a measurable structure.

In the above configuration, trough carrier rollers (5) + 6
1 (71 forms the main part of the present invention, and as shown in Fig. 2, the ball screw (13), slide rail (14), bevel gear (15), and lifting motor (16) all move the ball screw (71) from the horizontal position. The trough carrier rollers (5), (6), and (7) can be moved up and down independently to different heights (Fig. 3), and the conveyor belt (8) can be moved as needed. A convex angular displacement point can be given.

At this time, each carrier roller (17) (18) of the trough carrier roller (6) having a convex angular displacement point
The axis of (19) is, for example, a strain gauge (al [
bl (c) (dl (eJ) The axial load cell type roller attached with (f) is incorporated and the carrier roller load is applied to each carrier roller (17) (18) (19) via the belt (8), that is, the trough portion. The load distribution of the conveyor belt (8) at is processed electrically and can be measured.

Here, an axial load cell is generally used when shear stress and bending stress are generated in the shaft due to a force acting in the radial direction on a shaft that is supported or fixed at both ends. The applied load is measured by detecting it with a strain gauge.

In addition, strain gauges are generally known, and since the electrical resistance of nickel alloys such as manganin, advance, and constantan changes due to external force, this strain gauge is used to insulate this resistance wire on the surface of the object to be measured. The amount of strain is determined by attaching a piece of paper and measuring the resistance due to strain.

The trough carrier rollers in which the above-mentioned axial load cell is incorporated and the amount of strain is measured by the strain gauge need only be at least one set of trough carrier rollers;
It is not necessary to provide this for all trough carrier rollers.

In particular, in the explanation of the illustrated embodiment above, the trough carrier roller (6) having a convex angular displacement point was used as the second axial load cell roller, but the front and rear trough carrier rollers +51
(Of course, 7+ may be an axial load cell type roller.

(Effect of the invention) As described above, the conveyor belt running test machine of the present invention has the following features:
The conveyor belt is suspended between a driving booby and a driven pulley, and the tension of the conveyor belt is set at a predetermined level.

By setting the trough angle and applying an appropriate convex angular displacement to the trough carrier roller incorporating an axial load cell type roller and running a running test for a certain period of time, the stress distribution in the belt width direction at the trough part was measured. By associating changes in the belt object before and after the belt runs with the stress distribution in the belt width direction, it becomes possible to quantitatively optimize the design of the belt lateral stiffness, which had previously relied on experience. This is an extremely significant running test machine in terms of its design.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a running test machine for conveyor belts according to the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Figs. FIGS. 4(a) to 4(d) are schematic cross-sectional views showing each side of the trough carrier roller and the conveyor belt in a running state during running. FIGS. (1) Frame support. (2)...Driven pulley. (3)...Drive pulley. (5) (6) (7) ...Trough carrier roller. (8) Conveyor belt. (10)... Axial load cell. Patent applicant: Mitsuboshi Belting Co., Ltd. Figure 1, 2nd page

Claims (1)

[Claims] 1. A conveyor belt is suspended between a driving pulley and a driven pulley that are attached to a frame support at a required interval, and one or more sets of trough carrier rollers are arranged on the conveying side of the belt, and the driven pulley is moved. A running test machine for conveyor belts, characterized in that the trough carrier rollers have an axial load cell built into each roller shaft, and are movable up and down.