JP5227860B2 - Conveyor belt impact test method and apparatus - Google Patents

Description

  The present invention relates to a conveyor belt impact test method and apparatus, and more specifically, a conveyor belt impact test method capable of acquiring data on the state of deformation of a conveyor belt when subjected to impact force with a simple facility, and It relates to the device.

  In a belt conveyor apparatus, generally, a transported object is dropped on one end side of a conveyor belt that is wound between a driving pulley and a driven pulley, loaded on the belt, and the stacked transported object is transported to the other end side ( For example, see Patent Document 1). When the object to be transported is dropped on the belt, the impact force by the dropped object to be transported acts on the conveyor belt. Therefore, when the transported object to be dropped has a large potential energy, such as when the weight of the transported object is large or the dropped height is large, the core body layer (canvas layer, steel cord layer, etc.) constituting the belt The problem of cutting may occur.

  In consideration of such a problem, an impact test of the conveyor belt is performed. In the conventional impact test method, the fallen body is dropped freely on the test sample of the stretched conveyor belt, and then the damaged state is grasped by disassembling the test sample. However, since the impact force instantaneously acts on the test sample, even if the test sample is disassembled afterwards, it is impossible to grasp the deformation state of the conveyor belt until the core layer is cut. A sufficient analysis of sex could not be performed. Although it is possible to grasp the deformation state of a test sample that has received an impact force by using a high-speed camera, the high-speed camera is an expensive device, and therefore a person who can perform a test using a high-speed camera. Is limited. Therefore, there has been a demand for a method capable of acquiring the deformation state data of the conveyor belt when subjected to an impact force with a simple facility.

JP-A-8-151116

  An object of the present invention is to provide an impact test method and apparatus for a conveyor belt that can acquire deformation state data of the conveyor belt when subjected to an impact force with simple equipment.

  In order to achieve the above object, the conveyor belt impact test method of the present invention stretches a test sample of the conveyor belt in the longitudinal direction, and the stretched test sample is supported by two supports spaced a predetermined distance in the longitudinal direction. At this position, the test body is supported by the support, and the test object is deformed so as to protrude downward by dropping the fall object to the drop position set on the test sample between the two support positions. The deformed shape holding body disposed below the test sample at the dropping position is pressed and deformed to transfer the deformed shape of the deformed test sample, and the deformed state of the test sample is transferred based on the transferred shape. It is characterized by acquiring data.

  Here, a plurality of convex portions or concave portions are provided at intervals on the lower surface of the test sample, and when the deformed shape of the test sample is transferred to the deformed shape holder, the convex portion or the concave shape It is also possible to form an imprint of the part on the deformed shape holder, and acquire data on the deformation state of the test sample based on the imprint. Alternatively, a lattice pattern is formed on the upper surface of the deformed shape holding body, and based on a comparison between the lattice pattern before transferring the deformed shape of the test sample to the deformed shape holding body and the lattice pattern after the transfer. Data on the deformation state of the test sample can also be acquired. It is also possible to acquire relationship data between the deformation amount and the pressure of the deformed shape holding body, and to correct the deformation state data of the test sample based on the acquired relationship data.

  In addition, the impact test apparatus for a conveyor belt according to the present invention includes a tensioning means for stretching a test sample of the conveyor belt in the longitudinal direction, and two support positions at which the stretched test sample is spaced at a predetermined interval in the longitudinal direction. A supporting body that is supported by the above, a dropping body that drops to a dropping position set on the test sample between the two supporting positions, and a deformed shape holding body that is disposed below the test sample at the dropping position, It is characterized in that the deformed shape of the test sample is transferred by pressing and deforming the deformed shape holding body by the test sample deforming so as to protrude downward when the falling body falls.

  Here, a plurality of convex portions or concave portions can be provided at intervals on the lower surface of the test sample. Alternatively, a lattice pattern can be formed on the upper surface of the deformed shape holder. Provided is a control device to which the relationship data between the deformation amount and the pressure of the deformed shape holding body is input, and the deformation state data of the test sample acquired based on the shape transferred to the deformed shape holding body is stored in the control device. It is also possible to adopt a configuration in which the data of the deformation state of the test sample is inputted and corrected based on the relationship data between the deformation amount and the pressure of the deformed shape holder.

  According to the present invention, the test sample of the conveyor belt is stretched in the longitudinal direction, and the stretched test sample is supported by the support at the two support positions spaced apart by a predetermined distance in the longitudinal direction. The fall object is dropped to the drop position set on the test sample between the support positions, and the test sample is deformed to protrude downward, and the deformed test sample is arranged below the test sample at the drop position. The deformed shape holder is pressed and deformed, and the deformed shape of the deformed test sample is transferred to hold the maximum deformed shape when the test sample receives an impact force on the deformed shape holder. Can do. Therefore, even with such a simple facility, it is possible to acquire the deformation state data of the test sample based on the shape transferred to the deformed shape holder.

1 is an overall schematic diagram of an impact test apparatus for a conveyor belt according to the present invention. It is explanatory drawing which illustrates the state which the test sample deform | transformed to the maximum. FIG. 3 is a perspective view illustrating a deformed shape holding body to which a maximum deformed shape of the test sample in FIG. 2 is transferred. It is explanatory drawing which illustrates another deformed shape holding body. It is explanatory drawing which illustrates another test sample. It is explanatory drawing which illustrates the state which the test sample of FIG. 5 deform | transformed to the maximum. It is explanatory drawing which illustrates the deformation | transformation shape holding body to which the maximum deformation | transformation shape of the test sample of FIG. 6 was transcribe | transferred. It is a graph which illustrates the relationship between the deformation amount of a deformation | transformation shape holding body, and a press. It is a graph which illustrates the data of the deformation state of the corrected test sample.

  Hereinafter, the impact test method and apparatus for a conveyor belt according to the present invention will be described in detail based on the embodiments shown in the drawings.

  As illustrated in FIG. 1, a conveyor belt impact test apparatus 1 according to the present invention includes a tensioning means 2 for stretching a conveyor belt test sample 8 in the longitudinal direction, and a tensioned test sample 8 in the longitudinal direction. A supporting body 3 that is supported at two supporting positions SP with a predetermined interval S therebetween, a dropping body 4 that drops onto the test sample 8 from a predetermined height h, and a deformed shape that is disposed below the test sample 8 A body 5 and a control device 6 are provided. The test sample 8 is in a state in which the core layer 8a is exposed by removing the rubber layer 8b at both ends in the longitudinal direction.

  The tension means 2 includes a fixed clamp 2a, a movable clamp 2b, and a load cell 2c. The fixed clamp 2a and the movable clamp 2b each clamp the core layer 8a exposed at the longitudinal end of the test sample 8.

  The movable clamp 2b can move so as to approach and separate from the fixed clamp 2a, and can be fixed at a predetermined position. The load cell 2c is connected to one end (heart body layer 8a) of the test sample 8. The load cell 2c is locked by the movable clamp 2b when the end portions of the test sample 8 in the longitudinal direction are clamped by the fixed clamp 2a and the movable clamp 2b and the test sample 8 is stretched. Therefore, it is possible to grasp the tension when the test sample 8 is stretched based on the detection data of the load cell 2c.

  The support 3 can move below the test sample 8 to adjust the distance between them, and can be fixed at a predetermined distance. The predetermined interval between the two support bodies 3, that is, the predetermined interval S between the two support positions SP is, for example, about 300 mm (range of 200 mm to 400 mm). The upper part of the support 3 is a cylindrical part 3 a, and the cylindrical part 3 a is in contact with the lower surface of the test sample 8. The outer diameter of the cylindrical portion 3a is, for example, about 90 mm to 200 mm. The predetermined interval S between the two support positions SP and the outer diameter of the cylindrical portion 3a are set to be equivalent to the conditions under which the conveyor belt to be tested is used.

  The dropping body 4 is held at a predetermined height h by the dropping mechanism 7 and is dropped onto the test sample 8 by releasing the holding by the dropping mechanism 7. The falling body 4 is dropped to a drop position FP set on the test sample 8 between the two support positions SP. For example, the drop position FP is set at the midpoint between the two support positions SP.

  The shape, weight, size, and the predetermined height h (the distance from the position held by the dropping mechanism 7 to the upper surface of the test sample 8) of the falling body 4 are the conditions under which the conveyor belt to be tested is used. To be determined. In this embodiment, the lower end portion of the falling body 4 is hemispherical.

  The shape of the falling body 4 is desirably the same as or equivalent to the shape of the object to be transported loaded on the conveyor belt to be tested. When the corner of the conveyed object has a smooth shape, a bullet-shaped drop body 4 is generally used. When the corner of the object to be transported has a sharp shape, it is preferable to use a polygonal falling body 4 such as a triangular pyramid, and the more the sharply shaped falling body 4 is used, the more the conveyor belt (test The damage to the sample 8) becomes severe.

  The deformed shape holder 5 is disposed below the test sample 8 at the drop position FP. The deformed shape holder 5 is easily plastically deformed by the applied external force, and retains the deformed shape when the external force is no longer applied. Examples of the deformed shape holder 5 include various clays and those similar to these clays. It is preferable that the deformed shape holding body 5 has a characteristic of small plasticity and smooth plastic deformation when an external force is applied among clay.

  As will be described later, the deformed shape holder 5 is transferred with the deformed shape when the test sample 8 is deformed to the maximum. The deformed shape holding body 5 can have various shapes, but it is necessary to have a shape that does not buckle when the deformed shape of the test sample 8 is transferred by being pressed. In this embodiment, the shape of the deformed shape holding body 5 is a quadrangular prism shape obtained by reducing the square on the upper surface and the square on the lower surface in a similar manner.

  In this embodiment, a lattice pattern is formed on the upper surface of the deformed shape holder 5. The lattice pattern can be formed by grooves or by drawing.

  The control device 6 is input with relational data between the deformation amount D and the pressure P of the deformed shape holder 5. For example, the deformed shape holding body 5 is compressed by changing the pressure P, and the deformation amount D (deformation distortion) at the time of each pressure P is measured to grasp the relationship data between them. For example, relationship data indicating a proportional relationship between the deformation amount D and the pressure P of the deformed shape holding body 5 as shown in FIG.

  The procedure of the conveyor belt impact test method of the present invention is as follows.

  First, the respective ends in the longitudinal direction of the test sample 8 are clamped by the fixed clamp 2a and the movable clamp 2b, and the test sample 8 is stretched in the longitudinal direction. The tension applied to the test sample 8 is set to be equal to the condition under which the conveyor belt to be tested is used. The tensioned test sample 8 is supported by the support 3 at two support positions SP.

  Next, as illustrated in FIG. 2, the dropping body 4 is freely dropped from the predetermined height h to the dropping position FP set on the test sample 8. Thereby, the test sample 8 is deformed so as to protrude downward. Due to the deformed test sample 8, the deformed shape holding body 5 disposed at the drop position FP is pressed and deformed, and the deformed shape when the test sample 8 is deformed to the maximum is deformed as shown in FIG. It is transferred and held on the body 5.

  Next, the deformation state data of the test sample 8 is acquired based on the shape transferred to the deformed shape holding body 5. Specifically, based on the shape transferred to the deformed shape holding body 5, data and shape data of the maximum deformation angle AX and the maximum vertical deformation amount LX of the test sample can be acquired.

  Thus, even if it is a simple installation using the deformed shape holding body 5 without using an expensive device such as a high-speed camera, the test sample 8 is formed based on the shape transferred to the deformed shape holding body 5. It becomes possible to acquire the deformation state data.

  In this embodiment, since the lattice pattern 9 is formed on the upper surface of the deformed shape holder 5, the lattice pattern 9 before transferring the deformed shape of the test sample 8 and the lattice pattern 9 after transferring Based on the comparison, data of local deformation amounts at various positions of the test sample 8 can be acquired. That is, by comparing the interval of the lattice pattern 9 before transferring the deformed shape of the test sample 8 with the interval of the lattice pattern 9 after transferring, the local deformation amount (deformation strain) at that position is obtained. I can grasp it.

  Part of the impact energy imparted to the test sample 8 by the fall of the falling body 4 is consumed when the deformed shape holding body 5 is plastically deformed. Therefore, by correcting the acquired deformation state data of the test sample 8 so as to compensate for the loss of impact energy due to plastic deformation of the deformed shape holding body 5, it is possible to acquire data with higher accuracy.

  Therefore, for example, based on the relationship data between the deformation amount D and the pressure P of the deformed shape holding body 5, the acquired deformation state data of the test sample 8 is corrected. The maximum deformation amount DX of the deformed shape holding body 5 plastically deformed by the dropping of the falling body 4 can be grasped by measuring the deformed shape holding body 5 after deformation. The grasped deformation amount DX is input to the control device 6, and the pressure PX acting on the drop position FP of the deformation shape holding body 5 is determined based on the relationship data between the deformation amount D of the deformation shape holding body 5 and the pressure P. calculate.

  The reaction force (opposite pressure) of the pressure PX acts on the drop position FP of the test sample 8. Therefore, as illustrated in FIG. 9, the control device 6 calculates the deformation amount Lna at the arbitrary position n of the test sample 8 when the pressure PX acts on the drop position FP, that is, the curve B. The relationship between the pressure PX and the deformation amount Lna of the test sample 8 can be acquired by a test in which the test sample 8 is statically pressed.

  Next, the calculated deformation amount Lna (curve B) is added to the deformation state data (curve A) of the test sample 8 acquired based on the shape previously transferred to the deformed shape holding body 5. A curve C obtained by superimposing the curve A and the curve B is data on the deformation state of the test sample 8 that has been corrected to eliminate the influence of plastic deformation of the deformed shape holder 5.

  In FIG. 1, the upper surface of the deformed shape holding body 5 is in contact with the lower surface of the test sample 8 from the beginning, but as illustrated in FIG. 4, the upper surface of the deformed shape holding body 5 and the lower surface of the test sample 8 are interposed. It is also possible to provide a gap from the beginning. As shown in FIG. 4, by providing a gap, it is possible to reduce the influence of loss of impact energy due to plastic deformation of the deformed shape holding body 5.

  By the way, when the deformed shape holding body 5 is pressed by the deformed test sample 8, a slip occurs between the lower surface of the test sample 8 and the upper surface of the deformed shape holding body 5. Therefore, the local deformation amount data obtained using the lattice pattern 9 includes an error due to this slip.

  Therefore, in order to reduce the error due to the slip, it is preferable to provide a plurality of concave portions 10 at intervals on the lower surface of the test sample 8 as illustrated in FIG. The concave portion 10 is formed by a shallow groove, for example, and is provided in a lattice shape. As illustrated in FIG. 6, when the falling body 4 is dropped and the maximum deformed shape of the test sample 8 is transferred to the deformed shape holding body 5, the convex imprint 11 by the concave portion 10 is formed as illustrated in FIG. 7. The deformed shape holder 5 is formed. According to the imprint 11 by the concave portion 10, since the influence due to the slip is reduced, the distance (straight line length) between the concave portions 10 formed in the test sample 8 and the deformed shape holding body 5 illustrated in FIG. 7 are formed. By comparing the distance between the marks 11 (the length of the curve along the upper surface of the curved deformed shape holding body 5), the local deformation amount (deformation strain) at that position can be grasped.

  A convex portion can be provided on the lower surface of the test sample 8 instead of the concave portion 10, but the processing is easier when the concave portion 10 is provided. When a convex portion is provided on the lower surface of the test sample 8, a concave imprint 11 is formed on the deformed shape holder 5.

  The depth of the concave portion 10 and the height of the convex portion need only be able to form the imprint 11 on the deformed shape holding body 5 and need not be increased. 5 to 7, the concave portion 10 is exaggerated and greatly illustrated for easy understanding.

DESCRIPTION OF SYMBOLS 1 Impact test apparatus 2 Tensioning means 2a Fixed clamp 2b Movable clamp 2c Load cell 3 Support body 3a Cylindrical part 4 Falling body 5 Deformed shape holding body 6 Controller 7 Dropping mechanism 8 Test sample 8a Core body layer 8b Rubber layer 9 Grid pattern 10 Concave part 11 Press mark FP Drop position SP Support position

Claims (8)

  A test sample of the conveyor belt is stretched in the longitudinal direction, and the stretched test sample is supported by a support body at two support positions that are spaced apart in the longitudinal direction, and a test between the two support positions is performed. A falling body is dropped at a dropping position set on the sample, and the test sample is deformed so as to protrude downward, and a deformed shape holding body disposed below the test sample at the dropping position by the deformed test sample is provided. A method for impact test of a conveyor belt that is deformed by pressing, transfers the deformed shape of the deformed test sample, and acquires data on the deformed state of the test sample based on the transferred shape.   A plurality of convex portions or concave portions are provided at intervals on the lower surface of the test sample, and when the deformed shape of the test sample is transferred to the deformed shape holder, the convex portion or the concave portion is pressed. The impact test method for a conveyor belt according to claim 1, wherein a mark is formed on the deformed shape holder, and data on a deformation state of the test sample is acquired based on the pressed mark.   A lattice pattern is formed on the upper surface of the deformed shape holder, and the test sample is based on a comparison between the lattice pattern before transferring the deformed shape of the test sample to the deformed shape holder and the lattice pattern after the transfer. The impact test method for a conveyor belt according to claim 1, wherein data on the deformation state of the conveyor belt is acquired.   The relationship data between the deformation amount and the pressure of the deformed shape holding body is acquired, and the deformation state data of the test sample is corrected based on the acquired relationship data. Conveyor belt impact test method.   A tensioning means for stretching the test sample of the conveyor belt in the longitudinal direction, a support for supporting the stretched test sample at two support positions spaced apart by a predetermined distance in the longitudinal direction, and the two support positions A drop body that drops to a drop position set on the test sample in between, and a deformed shape holding body that is arranged below the test sample at the drop position, and deforms so as to protrude downward when the drop body falls. An impact test apparatus for a conveyor belt configured to transfer a deformed shape of a test sample by pressing and deforming the deformed shape holding body by a test sample to be performed.   The impact test apparatus for a conveyor belt according to claim 5, wherein a plurality of convex portions or concave portions are provided on the lower surface of the test sample at intervals.   6. The conveyor belt impact test apparatus according to claim 5, wherein a lattice pattern is formed on the upper surface of the deformed shape holder.   Provided is a control device to which the relationship data between the deformation amount and the pressure of the deformed shape holding body is input, and the deformation state data of the test sample acquired based on the shape transferred to the deformed shape holding body is stored in the control device. The conveyor belt according to any one of claims 5 to 7, wherein the conveyor belt according to any one of claims 5 to 7 is configured to input and correct the deformation state data of the test sample based on the relationship data between the deformation amount and the pressure of the deformed shape holding body. Impact test equipment.

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