Drop impact testing device

Abstract

This disclosure aims to provide a drop impact testing apparatus capable of reliably impacting a test specimen with a first weight. [Solution] A drop impact test apparatus according to one aspect of the present disclosure is a drop impact test apparatus capable of performing an impact test by dropping a first weight onto a test specimen, comprising: a guide rail extending in the vertical direction; a frame body guided by the guide rail and capable of free falling in the vertical direction; a first weight that falls together with the frame body and collides with the test specimen; and a connecting mechanism that connects the frame body and the first weight so that the weight of the first weight is selectively loaded onto the test specimen, wherein the connecting mechanism holds the first weight in a predetermined position relative to the frame body when the frame body is free falling and does not restrain the vertical upward movement of the first weight relative to the frame body when it collides with the test specimen.

Description

Technical Field

[0001] The present disclosure relates to a drop impact test device.

Background Art

[0002] An impact test device that performs an impact test on a test specimen by freely dropping a weight onto the test specimen is known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 describes an impact test device that tests the impact resistance of a test sample S by freely dropping an impact imparting body 10a from a beam portion 3a spanned between three frames 3 erected toward the test sample S.

[0005] However, according to this impact test device, it may be difficult to appropriately collide the impact imparting body 10a with the test sample S. For example, today, there may be a demand for impact evaluation at high speeds such as small flying objects, and in such cases, it may be difficult to surely collide the impact imparting body 10a with the test sample S at a desired speed.

[0006] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a drop impact test device capable of surely colliding a first weight with a test body.

Means for Solving the Problems

[0007] A drop impact test apparatus according to one aspect of the present disclosure is a drop impact test apparatus capable of performing an impact test by dropping a first weight onto a test specimen, comprising: a guide rail extending in the vertical direction; a frame body guided by the guide rail and capable of free falling in the vertical direction; a first weight that falls together with the frame body and collides with the test specimen; and a connecting mechanism that connects the frame body and the first weight so that the weight of the first weight is selectively loaded onto the test specimen, wherein the connecting mechanism holds the first weight in a predetermined position relative to the frame body when the frame body is free falling and does not restrain the vertical upward movement of the first weight relative to the frame body when it collides with the test specimen. [Effects of the Invention]

[0008] A drop impact test apparatus according to one aspect of this disclosure can reliably strike a test specimen with a first weight. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic front view showing the state of a drop impact testing apparatus according to one embodiment of the present disclosure before the first weight is dropped. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II of the drop impact testing apparatus shown in Figure 1. [Figure 3] Figure 3 is an enlarged cross-sectional view of the drop impact testing apparatus shown in Figure 2, along the line III-III. [Figure 4] Figure 4 is a schematic front view showing the state when the first weight is dropped into the drop impact test apparatus shown in Figure 1. [Figure 5] Figure 5 is a schematic front view showing the drop impact test apparatus of Figure 1 with the first weight replaced by the second weight. [Figure 6] Figure 6 is a schematic front view showing the state after the second weight has been dropped into the drop impact test apparatus shown in Figure 5. [Modes for carrying out the invention]

[0010] [Description of Embodiments in this Disclosure] First, the embodiments of this disclosure will be listed and described.

[0011] (1) A drop impact test apparatus according to one aspect of the present disclosure is a drop impact test apparatus capable of performing an impact test by dropping a first weight onto a test specimen, comprising: a guide rail extending in the vertical direction; a frame body guided by the guide rail and capable of free falling in the vertical direction; a first weight that falls together with the frame body and collides with the test specimen; and a connecting mechanism that connects the frame body and the first weight so that the weight of the first weight is selectively loaded onto the test specimen, wherein the connecting mechanism holds the first weight in a predetermined position relative to the frame body when the frame body is free falling and does not restrain the vertical upward movement of the first weight relative to the frame body when it collides with the test specimen.

[0012] The drop impact test apparatus is equipped with a frame body that is guided by guide rails and can freely fall vertically, and since the first weight falls together with the frame body, the position of the first weight when it falls can be easily controlled. In particular, when the frame body is in free fall, the first weight is held in a predetermined position relative to the frame body by a connecting mechanism, so that the first weight can reliably collide with the test object. Furthermore, since the connecting mechanism does not restrain the vertical upward movement of the first weight relative to the frame body when the first weight collides with the test object, the drop impact test apparatus can selectively apply the kinetic energy of the first weight to the test object.

[0013] (2) In (1) above, the first weight has a weight body, a shaft extending vertically upward from the weight body, and a retaining part positioned on the shaft, and the connecting mechanism preferably has a hole below the retaining part through which the shaft passes and which prevents the retaining part from passing. According to this embodiment, the first weight can be easily and reliably struck against the test specimen.

[0014] (3) In (2) above, it is preferable that a bearing is arranged on the inner surface of the hole. According to this embodiment, the smooth vertical movement of the shaft within the hole can be facilitated, the first weight can be easily and reliably struck by the test specimen, and the kinetic energy of anything other than the first weight can be more reliably suppressed from acting on the test specimen.

[0015] (4) In any of (1) to (3) above, it is preferable to further provide a support part that supports the frame body in free fall above the test specimen. According to this embodiment, the kinetic energy of the first weight can be easily and reliably applied to the test specimen.

[0016] (5) In any of (1) to (4) above, a second weight that can be fixed to the frame body is further provided, and the first weight and the second weight are preferably interchangeable. According to this embodiment, the size, shape, weight, etc. of the weight can be easily changed according to the size of the test specimen, the purpose of the test, etc. As a result, the desired test can be easily performed with a single drop impact test device.

[0017] (6) In the above (5), the second weight is fixed to the portion of the frame body facing the test specimen, and the total weight of the frame body and the second weight is applied to the test specimen. According to this embodiment, the weight of the second weight can be made relatively small, and the replacement of the first weight and the second weight can be made easier. As a result, the handling of the drop impact test device can be improved.

[0018] [Details of the embodiments of this disclosure] Hereinafter, embodiments of the present disclosure will be described in detail. Regarding the numerical values described in this specification, it is possible to arbitrarily combine the described upper limit value and lower limit value. In this specification, all numerical ranges from the combinable upper limit value to the lower limit value are described as preferred ranges. Also, each figure is schematic and may not match the actual dimensions, ratios, etc. In the present disclosure, the descriptions of "first" and "second" are for distinguishing the components to which they are attached, and do not limit the number, order, priority, etc.

[0019] [First Embodiment] <Drop Impact Testing Device> As shown in FIGS. 1 to 6, the drop impact testing device 1 is configured to be able to perform an impact test on a test body P by dropping a first weight 10 as shown in FIGS. 1 to 4. The drop impact testing device 1 includes a guide rail 30 extending in the vertical direction, a frame body 40 guided by the guide rail 30 and capable of freely falling in the vertical direction, a first weight 10 that falls together with the frame body 40 and collides with the test body P, and a connecting mechanism 50 that connects the frame body 40 and the first weight 10 so that the weight of the first weight 10 is selectively loaded on the test body P. The connecting mechanism 50 holds the first weight 10 at a predetermined position with respect to the frame body 40 when the frame body 40 freely falls, and does not restrict the vertically upward movement of the first weight 10 with respect to the frame body 40 at the time of collision with the test body P. In the present disclosure, "not restricting the vertically upward movement of the first weight" does not mean that the vertically upward movement of the first weight is unrestrictedly allowed, but means that the first weight 10 is movable in the vertical direction so that the weight of the frame body 40 is not substantially loaded on the test body P when the first weight 10 collides with the test body P.

[0020] Furthermore, the drop impact test apparatus 1 includes a base 60 on which the test specimen P is placed, a measuring unit 70 capable of measuring the impact force acting on the test specimen P, a holder 80 that holds the frame body 40, which is guided by the guide rail 30, at a predetermined position in the vertical direction and allows the frame body 40 to be detached at this predetermined position, and a support unit 90 that supports the frame body 40 when it is in free fall. In addition, as shown in Figures 5 and 6, the drop impact test apparatus 1 includes a second weight 20 that can be fixed to the frame body 40 (hereinafter, the first weight 10 and the second weight 20 may be collectively referred to as "weights 10 and 20"). Furthermore, the drop impact test apparatus 1 may be equipped with a displacement gauge (not shown) capable of measuring the displacement of the test specimen P when the weights 10 and 20 collide, a strain gauge (not shown) capable of measuring the strain of the test specimen P, and a camera (not shown) for photographing the state of the test specimen P when the weights 10 and 20 collide, depending on the purpose of the test.

[0021] The drop impact test apparatus 1 is equipped with a frame body 40 that is guided by a guide rail 30 and can freely fall vertically, and since the first weight 10 falls together with the frame body 40, the position of the first weight 10 when it falls can be easily controlled. In particular, when the frame body 40 is in free fall, the first weight 10 is held in a predetermined position relative to the frame body 40 by the connecting mechanism 50, so that the first weight 10 can reliably collide with the test specimen P. Furthermore, since the connecting mechanism 50 does not restrain the vertical upward movement of the first weight 10 relative to the frame body 40 when the first weight 10 collides with the test specimen P, the drop impact test apparatus 1 can selectively apply the kinetic energy of the first weight 10 to the test specimen P.

[0022] The drop impact testing device 1 can perform high-speed impact evaluations of small, heavy objects, such as small flying objects or collisions between adjacent parts, using a first weight 10. The heavy object may be, for example, a flying stone. Furthermore, the drop impact testing device 1 can perform high-speed impact tests of objects several to several hundred times heavier than the first weight 10 using a second weight 20. Thus, the drop impact testing device 1 can perform impact evaluations of objects of a wide range of weights. For example, it can perform both a first drop impact test with a first weight of 1 kg to 100 kg and a second drop impact test with a second weight of 100 kg to 550 kg.

[0023] (First weight) As shown in Figures 1 to 4, the first weight 10 includes a weight body 11, a shaft 12 extending vertically upward from the weight body 11, and a retaining part 13 positioned on the shaft 12.

[0024] The weight body 11 is a solid object that collides with the test specimen P. The weight body 11 has a collision portion 11a that collides with the test specimen P. The specific shape of the collision portion 11a is not particularly limited, but it may be convex, for example. A convex shape for the collision portion 11a makes it easier to conduct impact tests that simulate the impact of small flying objects, etc.

[0025] The shaft 12 extends in a straight line in the vertical direction. The shaft 12 extends from a part of the upper portion of the weight body 11 in a plan view (vertical view; Z-axis direction view in Figures 1 to 4). That is, in a plan view, the outline of the shaft 12 is contained within the weight body 11. With this configuration, the first weight 10 is configured such that the shaft 12 passes through the hole 51 described later, while the weight body 11 does not pass through the hole 51. A specific shape of the shaft 12 could be, for example, cylindrical.

[0026] The retaining portion 13 prevents the shaft 12 from passing through the hole 51 and falling downward. The first weight 10, having the retaining portion 13, is positioned so that it collides with the test specimen P with the shaft 12 passing through the hole 51. According to this embodiment, the position of the weight body 11 can be easily and reliably aligned with the test specimen P when it collides with the test specimen P.

[0027] The retaining portion 13 only needs to be configured to prevent the shaft 12 from coming out of the hole 51. The retaining portion 13 may be, for example, a flange that protrudes radially outward from the outer circumferential surface of the shaft 12. The flange may protrude from a part of the outer circumferential surface of the shaft 12, or it may protrude from the entire outer circumferential surface. By having the retaining portion 13 be a flange, it is possible to easily and reliably prevent the shaft 12 from coming out of the hole 51 while ensuring the free movement of the shaft 12 within the hole 51.

[0028] The weight of the first weight 10 can be set according to the purpose of the test, etc. The lower limit of the weight of the first weight 10 may be, for example, 1 kg. The upper limit of the weight of the first weight 10 may be, for example, 100 kg, 50 kg, or 20 kg. The weight of the first weight 10 is the weight (the first weight described above) that is loaded onto the test specimen P by the drop impact test using the first weight 10. In other words, the drop impact test device 1 can perform the first drop impact test described above using the first weight 10. The drop impact test device 1 may be equipped with multiple types of first weights 10. In this case, an appropriate first weight 10 should be selected and used according to the purpose of the test, etc.

[0029] (Second weight) The second weight 20 is interchangeable with the first weight 10. As shown in Figures 5 and 6, the second weight 20 can be fixed to the frame 40. According to this embodiment, the size, shape, weight, etc. of the weights 10 and 20 can be easily changed according to the size of the test specimen P and the purpose of the test. As a result, the desired test can be easily performed with a single drop impact test device 1.

[0030] The fixing position of the second weight 20 relative to the frame body 40 is not particularly limited, but the second weight 20 may be fixed to the portion of the frame body 40 facing the test specimen P. In this case, the fixing position may be on the lower surface of the frame body 40. That is, the second weight 20 may be exposed below the frame body 40 so as to directly collide with the test specimen P. When the second weight 20 is fixed to the portion of the frame body 40 facing the test specimen P, the frame body 40 has a fixing portion (not shown) for fixing the second weight 20. The fixing portion may be, for example, a gripping portion that grips the peripheral edge of the second weight 20.

[0031] When the second weight 20 directly impacts the test specimen P, the second weight 20 has an impact portion 20a that impacts the test specimen P. The impact portion 20a may be, for example, a flat surface.

[0032] The second weight 20, while fixed to the frame 40, free-falls simultaneously with the frame 40 and collides with the test specimen P. Therefore, in a drop impact test using the second weight 20, the combined weight of the frame 40 and the second weight 20 is loaded onto the test specimen P. In other words, in a drop impact test using the second weight 20, the weight of the entire free-falling body, including the frame 40 and the second weight 20, becomes the weight loaded onto the test specimen P (the second weight mentioned above). That is, the drop impact test device 1 can perform the second drop impact test described above using the second weight 20. By ensuring that the weight of the entire free-falling body is loaded onto the test specimen P, the weight of the second weight 20 can be relatively reduced, making it easier to replace the first weight 10 with the second weight 20. As a result, the operability of the drop impact test device 1 can be improved.

[0033] The lower limit of the weight of the second weight 20 may be, for example, 100 kg or 200 kg. On the other hand, the upper limit of the weight of the second weight 20 may be 500 kg, 450 kg or 400 kg. The drop impact test device 1 may be equipped with multiple types of second weights 20. In this case, an appropriate second weight 20 may be selected and used depending on the purpose of the test, etc.

[0034] The shape of the second weight 20 can be set according to the purpose of the test, etc. The shape of the second weight 20 may be, for example, a plate.

[0035] (Test specimen) The test specimen P is not particularly limited and may be, for example, a molded body containing a predetermined metal or resin, or a structure composed of such a material.

[0036] (Guide rail) The guide rail 30 is a guide member that guides the frame body 40 in the vertical direction. The drop impact test apparatus 1 is equipped with a pair of guide rails 30. The pair of guide rails 30 are positioned opposite each other, for example, in a plan view, with the test specimen P in between. The pair of guide rails 30 are erected, for example, on a surface plate 100. As shown in Figure 2, each guide rail 30 has a pair of first running surfaces 30a on which the first roller 42a (described later) provided on the frame body 40 runs, and a second running surface 30b on which the second roller 42b (described later) runs. The pair of first running surfaces 30a face each other, and in Figure 2 they face each other in the Y-axis direction. The second running surfaces 30b are positioned perpendicular to the pair of first running surfaces 30a and are formed along the YZ plane in Figure 2. In addition, clearances are provided between the first roller 42a and the first running surfaces 30a, and between the second roller 42b and the second running surface 30b. According to this embodiment, the frame body 40 can be made to fall more reliably.

[0037] The vertical length of the guide rail 30 can be set according to the purpose of the test, etc., and may be 5m or more, 10m or more, or 13m or more.

[0038] (Frame) The frame 40 free-falls together with the weights 10 and 20 so that the weights 10 and 20 reliably collide with the test specimen P. In other words, the frame 40 is an alignment body that aligns the weights 10 and 20 with the test specimen P in a plan view. In the first drop impact test using the first weight 10, the frame 40 does not load weight onto the test specimen P. As a result, the drop impact test device 1 can selectively apply the kinetic energy of the first weight 10 to the test specimen P in the first drop impact test. On the other hand, in the second drop impact test using the second weight 20, the frame 40 loads weight onto the test specimen P together with the second weight 20. As a result, the drop impact test device 1 can apply the kinetic energy of the free-falling body including the second weight 20 and the frame 40 to the test specimen P in the second drop impact test.

[0039] The frame body 40 has a main body 41 on which the weights 10 and 20 are placed, and a plurality of rollers 42a and 42b that are guided by the guide rail 30. The frame body 40 also has a connecting part 43 that is detachably connected to the holder 80, which will be described later.

[0040] A first weight 10 is detachably mounted on the main body 41 via a connecting mechanism 50, which will be described later. A second weight 20 is also detachably mounted on the main body 41 via the fixing part described above. The main body 41 has a top plate 41a and a bottom plate 41b facing each other in the vertical direction (Z-axis direction), and a plurality of support columns 41c connecting the top plate 41a and the bottom plate 41b.

[0041] As shown in Figure 2, multiple rollers 42a and 42b are rotatably arranged on the top plate 41a and the bottom plate 41b (the bottom plate 41b is shown as an example in Figure 2). The multiple rollers 42a and 42b include multiple first rollers 42a arranged to sandwich each guide rail 30 in a plan view, and multiple second rollers 42b arranged to maintain the top plate 41a and the bottom plate 41b between a pair of guide rails 30 in a plan view. As shown in Figure 2, the frame body 40 has two pairs of first rollers 42a arranged on the side edges in the X-axis direction, facing each other in the Y-axis direction, and two second rollers 42b arranged to maintain the distance between the top plate 41a and the bottom plate 41b in the X-axis direction. The first rollers 42a are arranged to be in contact with the first running surface 30a on the guide rail 30. The second rollers 42b are arranged to be in contact with the second running surface 30b on the guide rail 30. The main body 41 is configured to be able to free fall in the vertical direction by restricting its movement in the horizontal direction (XY plane direction) with multiple rollers 42a and 42b.

[0042] (Connection mechanism) As shown in Figure 3, the connecting mechanism 50 has a hole 51 through which the shaft 12 passes below the retaining portion 13, and which prevents the shaft from passing through the retaining portion 13. The first weight 10 is positioned such that the weight body 11 is located below the hole 51 and the retaining portion 13 is located above the hole 51. By having the hole 51, the connecting mechanism 50 can easily restrict the position of the shaft 12 relative to the frame body 40 in the horizontal direction. Therefore, the drop impact test device 1 can easily and reliably collide the first weight 10 with the test specimen P.

[0043] The hole 51 has a first hole 51a on its inner circumferential surface in which a bearing 52 is positioned. The hole 51 also has a second hole 51b, which has a larger diameter than the diameter of the shaft 12. The first hole 51a and the second hole 51b are each located in the bottom plate 41b of the frame body 40. More specifically, the bottom plate 41b has a two-tiered structure in the portion through which the shaft 12 passes, with the first hole 51a formed in the upper tier and the second hole 51b formed in the lower tier. The second hole 51b may be positioned with a predetermined clearance from the shaft 12. That is, the diameter of the second hole 51b may be larger than the inner diameter of the bearing 52.

[0044] The bearing 52 is positioned to cover the outer circumferential surface of the shaft 12. During testing, the outer circumferential surface of the shaft 12 may be arranged so as not to come into contact with any components other than the bearing 52. The drop impact test device 1, by positioning the bearing 52 on the inner circumferential surface of the hole 51 (more specifically, the first hole 51a), can facilitate the smooth vertical movement of the shaft 12 within the hole 51, allowing the first weight 10 to collide with the test specimen P easily and reliably, and more reliably suppressing the acting of kinetic energy other than that of the first weight 10 on the test specimen P.

[0045] Furthermore, if the connecting mechanism 50 has multiple holes, it is also possible to place the bearings on the inner circumferential surface of each hole. In this case, the inner diameters of each hole may be the same or different.

[0046] As described above, the hole 51 is provided in the bottom plate 41b of the frame body 40. The hole 51 does not necessarily have to be provided in the top plate 41a of the frame body 40. By providing the hole 51 only in the bottom plate 41b of the frame body 40, the vertical range of motion of the first weight 10 can be increased, and the first weight 10 can be easily brought into contact with the test specimen P.

[0047] (pedestal) The base 60 has a placement surface 60a on which the test specimen P is placed. The base 60 may have a fixing jig for fixing the test specimen P to the placement surface 60a. The placement surface 60a is formed on the upper surface of the base 60. The base 60 is positioned such that the placement surface 60a is located vertically below the first weight 10.

[0048] (Measurement part) The measuring unit 70 is positioned, for example, below the base 60, and measures the impact force acting on the test specimen P upon collision with the weights 10 and 20. The specific configuration of the measuring unit 70 is not particularly limited, but it may include, for example, a load cell. The position of the measuring unit 70 is not particularly limited. The measuring unit 70 may be positioned, for example, on the frame 40. In this case, the measuring unit 70 may be positioned so as to directly collide with the test specimen P. If the measuring unit 70 directly collides with the test specimen P, the weights 10 and 20 will indirectly collide with the test specimen P, with the measuring unit 70 in between.

[0049] (Holding tool) The holder 80 detaches the frame body 40 from a predetermined position, causing the frame body 40 to fall freely relative to the test specimen P. The detachment height of the frame body 40 by the holder 80 can be set according to the purpose of the test, etc. The holder 80 may also be movable in the direction in which the guide rail 30 extends (vertical direction) so that the above detachment height can be changed.

[0050] The upper limit of the above-mentioned separation height is not particularly limited. From the viewpoint of suppressing the increase in the size of the device, the upper limit of the above-mentioned separation height may be, for example, 25m or 20m. On the other hand, the lower limit of the above-mentioned separation height is not particularly limited and may be set to a height appropriate to the purpose of the test, etc.

[0051] (Support part) The support portion 90 supports the free-falling frame body 40 above the surface plate 100. As shown in Figure 4, the support portion 90 is preferably provided to support the free-falling frame body 40 at a first position above the test specimen P. According to this embodiment, the kinetic energy of the first weight 10 can be easily and reliably applied to the test specimen P.

[0052] In the state where the first weight 10 collides with the test specimen P, it is preferable that the weight body 11 and the frame body 40 are separated in the vertical direction. That is, in the state where the first weight 10 collides with the test specimen P, it is preferable that the weight body 11 is not in contact with the frame body 40. According to this embodiment, the kinetic energy of the first weight 10 can be easily and reliably applied to the test specimen P.

[0053] Furthermore, as shown in Figure 6, the support portion 90 may be movably provided in a second position that does not come into contact with the free-falling frame body 40. That is, the support portion 90 is preferably provided so that it can move between the first position and the second position and be fixed in the first position and the second position. In the drop impact test apparatus 1, it is desirable that the frame body 40 be supported by the support portion 90 during the first drop impact test described above. On the other hand, during the second drop impact test described above, it is desirable that the frame body 40, together with the second weight 20, form a free-falling body and collide with the test specimen P. Therefore, during the second drop impact test, the support portion 90 should be positioned at a distance from the frame body 40 as a safety device for the free-falling body that collides with the test specimen P. From this viewpoint, the operability of the drop impact test apparatus 1 can be improved by providing the support portion 90 so that it can be fixed in the first position and the second position.

[0054] The specific configuration for moving between the first position and the second position is not particularly limited, but the support portion 90 may have a base portion 91 that is positioned on the surface plate 100 and is extendable and retractable in the vertical direction, and a stopper 92 that protrudes upward from the base portion 91.

[0055] [First Drop Impact Test] Next, an example of the procedure for conducting the first drop impact test will be described with reference to Figures 1 and 4, etc. In the first drop impact test, first, as shown in Figure 1, the first weight 10 is placed on the frame body 40 and the test specimen P is placed on the base 60, and the frame body 40 is detached from the holder 80. Upon detachment, the frame body 40 free-falls together with the first weight 10 while maintaining its relative position to the first weight 10.

[0056] Next, in the first drop impact test, as shown in Figure 4, the weight body 11 of the first weight 10 collides with the test specimen P. At this time, it is preferable that the frame body 40 is supported by the support part 90 above the test specimen P. The first weight 10 that collides with the test specimen P rebounds to a moderate degree, but since the drop impact test device 1 is equipped with a connection mechanism 50, the vertical upward movement of the first weight 10 is not restrained. As a result, the kinetic energy of the first weight 10 can be easily and selectively applied to the test specimen P.

[0057] [Second Drop Impact Test] Next, an example of the procedure for conducting the second drop impact test will be described with reference to Figures 5 and 6. In the second drop impact test, first, as shown in Figure 5, the second weight 20 is placed on the frame body 40 and the test specimen P is placed on the base 60, and the frame body 40 is detached from the holder 80. This detachment causes the free-falling body with the second weight 20 fixed to the frame body 40 to free-fall toward the test specimen P.

[0058] Next, in the second drop impact test, as shown in Figure 6, the free-falling body collides with the test specimen P. In this case, the free-falling body does not need to be supported by the support part 90. As a result, the kinetic energy of the free-falling body can be applied to the test specimen P.

[0059] [Other embodiments] The above embodiments do not limit the configuration of the present invention. Therefore, the above embodiments allow for the omission, substitution, or addition of components of each part of the above embodiments based on the description herein and common technical knowledge, and all such omissions, substitutions, or additions should be interpreted as falling within the scope of the present invention.

[0060] In the above embodiment, a configuration in which the first weight and the second weight are interchangeable was described. However, the drop impact testing device only needs to be configured to perform impact tests using the first weight, and it is not essential that it can perform impact tests using the second weight. The drop impact testing device can easily perform impact tests using the first weight, thereby facilitating the evaluation of impacts from small flying objects and the like.

[0061] Even if the drop impact testing device is equipped with the second weight, the fixing position of the second weight to the frame is not limited to the configuration of the above embodiment.

[0062] The specific configuration of the above-described connection mechanism is not limited to the configuration described in the above embodiment. For example, the connection mechanism may have a string member that connects the frame body and the first weight. In this case, the string member may be suspended from the frame body. The first weight may also be attached to the lower end portion of the suspended string member.

[0063] In the above embodiment, a configuration in which a bearing is arranged on the inner circumferential surface of the hole has been described. However, it is also possible to adopt a configuration in which no bearing is arranged on the inner circumferential surface of the hole. Furthermore, by applying a sliding surface treatment to the inner circumferential surface of the hole, it is possible to facilitate the movement of the shaft within the hole. [Explanation of Symbols]

[0064] 1. Drop impact testing device 10. First weight 11 Weight body 11a, 20a Collision part 12 shafts 13 Retaining part 20. Second weight 30 Guide Rails 30a 1st running surface 30b 2nd running surface 40 frame body 41 Main unit 41a Top plate 41b Bottom plate 41c strut 42a First roller 42b Second Roller 43 Connection part 50 Connection mechanism 51 holes 51a First hole 51b Second hole 52 bearings 60 base 60a Placement surface 70 Measuring part 80 Holder 90 Support part 91 Base 92 Stopper 100 Surface Plate P test specimen

Claims

1. A drop impact testing apparatus capable of performing an impact test by dropping a first weight onto a test specimen, A guide rail extending vertically, A frame body that is guided by the above-mentioned guide rail and can freely fall in the vertical direction, A first weight that falls together with the frame body and collides with the test specimen, A connecting mechanism is provided to connect the frame and the first weight so that the weight of the first weight is selectively applied to the test specimen. Equipped with, The above connection mechanism is a drop impact testing device that holds the first weight in a predetermined position relative to the frame body when the frame body is in free fall, and does not restrain the vertical upward movement of the first weight relative to the frame body when it collides with the test specimen.

2. The first weight described above comprises a weight body, a shaft extending vertically upward from the weight body, and a retaining part positioned on the shaft. The drop impact testing apparatus according to claim 1, wherein the connection mechanism has a hole through which the shaft passes below the retaining portion and which prevents the shaft from passing through the retaining portion.

3. The drop impact testing apparatus according to claim 2, wherein the above-mentioned hole has a bearing arranged on its inner circumferential surface.

4. The drop impact test apparatus according to any one of claims 1 to 3, further comprising a support portion that supports the frame body that has fallen in free fall above the test specimen.

5. The frame body is further equipped with a second weight that can be fixed to the above frame body, The drop impact test apparatus according to any one of claims 1 to 3, wherein the first weight and the second weight are interchangeable.

6. The second weight described above is fixed to the portion of the frame body facing the test specimen. The drop impact test apparatus according to claim 5, wherein the total weight of the frame body and the second weight is applied to the test specimen.

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