Dual mode impact test apparatus using shooting and drop methods

Abstract

The present invention relates to a shooting and drop dual-type impact testing device comprising: a frame positioned to extend upward from a base surface; a lift crane positioned at the top of the frame, which drops a weight of a set load to impact a specimen positioned at the bottom of the frame; and a launch module connected and installed at a point between the bottom and top of the frame, which launches a metal ball of a set load to impact the specimen, wherein a free-fall impact test and a local impact test are selectively performed as the dropping of the weight by the lift crane and the launching of the metal ball by the launch module are selectively performed.

Description

Technology Field

[0001] The present invention relates to an impact testing device, and more specifically, to a shooting and drop dual-type impact testing device that allows for the selective performance of free-fall impact testing and local impact testing through a single device by not only performing impact testing of a specimen by a drop method by dropping a weight but also by a shooting method by launching a metal ball. Background Technology

[0002] A 'free-fall tester' as disclosed in Korean Patent Publication No. 10-2013-0077689, etc., is widely used to evaluate the impact behavior of materials or structures.

[0003] A free-fall tester can evaluate whether a specimen is damaged, its deformation state, and energy absorption characteristics by dropping a weight with a set load from a predetermined height to impact the specimen under test.

[0004] Impact testing using a free-fall tester is utilized in various industrial fields due to the relatively excellent simplicity and reproducibility of the test conditions.

[0005] Meanwhile, when conducting a free-fall test, it is common for the structure to be configured so that the potential energy of the weight is transferred to the entire cross-section of the specimen or a relatively wide area, making it easy to evaluate the average impact response of the entire structure.

[0006] However, conventional free-fall tests like this had a problem in that they were limited in precisely observing impact behavior in specific local areas due to the characteristic that impact energy is distributed and transferred throughout the entire specimen.

[0007] For example, when evaluating the impact durability of specific welds, corners, vulnerable areas, or local reinforcement structures of a structure, there was a problem in that it was difficult to achieve the desired test conditions using only free-fall tests.

[0008] To resolve this problem, a testing method is being implemented in some cases that uses metal balls to concentrate and deliver impact energy to a local cross-section of the specimen.

[0009] Unlike free-fall impact tests, a testing method that uses metal balls to concentrate impact energy on a local cross-section of a specimen allows for the concentration of impact on a specific area of ​​the specimen, making it easier to observe local failure or deformation behavior.

[0010] However, metal ball launchers used in testing methods that concentrate impact energy onto a local cross-section using metal balls were generally configured as separate equipment from free-fall testers, which required redundant installation of facilities and presented problems in ensuring continuity between test conditions.

[0011] In addition, conventional metal ball launchers faced limitations in launch speed control, launch direction stability, and the structure for recovering test specimens after testing, which made it difficult to conduct local impact tests.

[0012] For the reasons mentioned above, attempts are being made in this field to develop impact testing devices that not only allow for the simultaneous performance of free-fall and local impact tests but also facilitate the control of launch speed during the local impact test process; however, satisfactory results have not been achieved to date. Prior art literature

[0013] Republic of Korea Published Patent No. 10-2013-0077689 The problem to be solved

[0014] The present invention is proposed to resolve the problems of the conventional technology described above, and aims to provide an impact testing device that can increase the utility of the device by allowing free-fall impact testing and local impact testing to be selectively performed through a single device, as the impact test of the specimen is performed not only by a drop method by dropping a weight but also by a shooting method by launching a metal ball. means of solving the problem

[0015] To achieve the above objective, the present invention,

[0016] A shooting and drop dual-type impact testing device is proposed, comprising: a frame positioned to extend upward from a base surface; a lift crane positioned at the top of the frame, which drops a weight of a set load to impact a specimen positioned at the bottom of the frame; and a launch module connected and installed at a point between the bottom and top of the frame, which launches a metal ball of a set load to impact the specimen; wherein a free-fall impact test and a local impact test are selectively performed as the dropping of the weight by the lift crane and the launching of the metal ball by the launch module are selectively performed.

[0017] The above frame is located on the upper part of the groove formed on the base surface.

[0018] The above specimen is placed on the bottom surface of the groove formed on the base surface.

[0019] The above lift crane includes a winch that winds or unwinds a rope extending from the above weight body.

[0020] The launch module comprises: rotating members positioned facing each other at a distance; a motor that transmits rotational force to each of the rotating members; and a housing that accommodates the rotating members and the motor.

[0021] The above housing includes an inlet formed on one side and an outlet formed on the other side.

[0022] The above-mentioned outlet is formed on one side of the housing, and is formed on the side facing the specimen.

[0023] The above launch module further includes a controller that controls the rotational speed of the motor.

[0024] The above-described launch module further includes a control member for adjusting the gap between one of the rotating members and the other. Effects of the invention

[0025] The shooting and drop dual-type impact testing device according to the present invention allows for the dropping of a weight by a lift crane positioned on the frame as well as the launching of a metal ball by a launching module connected to the frame. Since the impact test of a specimen can be performed using the drop method of dropping the weight and the shooting method of launching the metal ball, the device can selectively perform free-fall impact tests and local impact tests through a single device, thereby increasing the utility of the device. Brief explanation of the drawing

[0026] FIG. 1 is a schematic diagram showing the overall structure of a shooting and drop dual-type impact testing device according to the present invention. FIG. 2 is a perspective view showing the external appearance of a launch module in a shooting and drop dual-type impact test device according to the present invention. FIG. 3 is an exemplary diagram showing the insertion and discharge of a metal ball in the launch module of a shooting and drop dual-type impact test device according to the present invention. Specific details for implementing the invention

[0027] The present invention will be described in detail below with reference to the attached drawings.

[0029] As illustrated in FIG. 1, the shooting and drop dual impact test device (A) according to the present invention includes a frame (100); a lift crane (200); and a launch module (300).

[0030] The frame (100) of the present invention is arranged to extend upward from the base surface (10).

[0031] Therefore, by placing a lift crane (200) on top of the frame (100), a weight (210) can be dropped from the lift crane (200) toward a specimen (20) located on the base surface (10).

[0032] At this time, the frame (100) is positioned above the groove (11) formed on the base surface (10), so that when a weight (210) suspended from the lift crane (200) falls into the groove (11) formed on the base surface (10), unintended movement of the weight (210) can be prevented by blocking its progress through the inner surface of the groove (11), thereby preventing accidents caused by unintended movement of the weight (210).

[0033] Meanwhile, the frame (100) is composed of multiple steps (drawing symbols not shown), and a ladder (110) is provided on each step so that a worker can go up and down the frame (100) through the ladder (110), thereby making it easy to inspect the lift crane (200).

[0034] And the specimen (20) is placed on the bottom surface of the groove (11) formed in the base surface (10), so that a weight (210) falling from the lift crane (200) into the groove (11) can transmit an impact to the specimen (20).

[0035] The lift crane (200) of the present invention is positioned at the top of the frame (100) and drops a weight (210) of a set load to impact a specimen (20) positioned at the bottom of the frame (100).

[0036] Therefore, a free-fall impact test of the specimen (20) can be performed by dropping the weight (210) by the lift crane (200), i.e., by the drop method.

[0037] At this time, the lift crane (200) includes a winch (220), so that the weight (210) can be lifted as the winch (220) winds the rope (not shown in the drawing) extending from the weight (210), and the weight (210) can be lowered as the winch (220) releases the rope extending from the weight (210) all at once.

[0038] Here, the winch (220) may be of any ordinary structure and type as long as it is capable of winding and unwinding the rope extending from the weight (210), so a detailed description of the winch (220) is omitted.

[0039] The launch module (300) of the present invention is connected and installed at a point between the bottom and top of the frame (100), and launches a metal ball (310) of a set load to impact the specimen (20).

[0040] Therefore, a local impact test of the specimen (20) can be performed by firing a metal ball (310) by the launch module (300), in other words, by a shooting method.

[0041] At this time, the metal balls (310) can be provided in multiple numbers with different diameters and loads.

[0042] Therefore, the conditions of the local impact test can be varied by selectively applying a metal ball (310).

[0043] And the launch module (300) includes a rotating member (320) positioned facing each other at a distance; and a motor (330) that transmits rotational force to each of the rotating members (320), so that as a pair of rotating members (320) rotate by the transmission of rotational force by the motor (330), a metal ball (310) inserted between one of the rotating members (320) and the other can be launched.

[0044] And the launch module (300) includes a housing (340), so that the rotating member (320) and the motor (330) are accommodated by the housing (340), and thus damage to the rotating member (320) and the motor (330) due to the transmission of shock from the outside can be prevented by protection by the housing (340).

[0045] At this time, the housing (340) includes an inlet (341) formed on one side and an outlet (342) formed on the other side, so that the metal ball (310) can move along the inlet (341), thereby allowing the metal ball (310) to be smoothly inserted between one of the rotating members (320) and the other, and the metal ball (310) can be launched without interference from the housing (340) by the outlet (342).

[0046] Here, the discharge port (342) is formed on one side of the housing (340), particularly on the side facing the specimen (20), so that a metal ball (310) radiating out of the housing (340) through the discharge port (342) can be applied to the specimen (20).

[0047] And the launch module (300) includes a controller (not shown in the drawing), so that the launch speed of the metal ball (310) can be controlled as the rotation speed of the motor (330) is controlled by the controller.

[0048] At this time, the controller may be of any ordinary structure and method as long as it is capable of controlling the rotational speed of the motor (330), so a detailed description of the controller is omitted.

[0049] And the launch module (300) includes a control member (not shown in the drawing) so that the gap between one of the rotating members (320) and the other is adjusted by the control member, thereby allowing the launch of metal balls (310) having various diameters through the launch module (300).

[0050] Here, the adjustment member may be of any ordinary structure and method as long as it allows for the adjustment of the gap between one of the rotating members (320) and another, and an example thereof may be a linear motion guide.

[0051] Meanwhile, the launch module (300) further includes an auxiliary frame (350) that supports the housing (340).

[0052] Accordingly, by combining the auxiliary frame (350) with the frame (100) described above, the launch module (300) according to the present invention can be connected and installed at a point between the bottom and top of the frame (100).

[0053] Here, the connection between the auxiliary frame (350) and the frame (100) is achieved by a fastening member (not shown in the drawing), such as a bolt fastening, so that the connection state between the launch module (300) and the frame (100) can be stably maintained, and the launch module (300) can be separated from the frame (100) by releasing the fastening member.

[0055] The impact test using the shooting and drop dual-type impact test device (A) according to the present invention will be described in detail as follows.

[0056] The shooting and drop dual-type impact test device (A) according to the present invention can perform a free-fall impact test.

[0057] That is, in the present invention, a lift crane (200) is positioned at the top of a frame (100) extending upward from a base surface (10). Since a weight (210) is dropped through the lift crane (200) while a specimen (20) is placed at the bottom of the frame (100), the impact of the fall of the weight (210) can be applied to the specimen (20), thereby allowing a free-fall impact test of the specimen (20) to be performed.

[0058] At this time, the lift crane (200) includes a winch (220), and by winding the rope extending from the weight (210) through the winch (220) to lift the weight (210) and then releasing the rope all at once, the weight (210) can be lowered, thereby reducing the inconvenience associated with lifting and lowering the weight (210).

[0059] However, in a free-fall impact test, the impact energy is distributed relatively evenly throughout the specimen (20), so it may be difficult to precisely observe the impact behavior in a specific local area.

[0060] However, in the present invention, a launch module (300) is connected and installed at a point between the bottom and top of the frame (100), and a local impact test of the specimen (20) can be performed by launching a metal ball (310) with a set load through the launch module (300).

[0061] Therefore, when observation of impact behavior in a specific local area is required, a metal ball (310) is fired through the firing module (300) while the specimen (20) is placed below the firing module (300), so that the impact of the firing of the metal ball (310) can be applied to a specific area of ​​the specimen (20), thereby allowing for a local impact test of the specimen (20) to be performed, and thus, observation of impact behavior in a specific local area can be facilitated.

[0062] At this time, the launch module (300) of the present invention includes a rotating member (320) positioned facing each other at a distance as shown in FIG. 2; and a motor (330) that transmits rotational force to each of the rotating members (320). Therefore, as a pair of rotating members (320) rotate by the transmission of rotational force by the motor (330), a metal ball (310) inserted between one of the rotating members (320) and the other can be launched.

[0063] Here, the housing (340) that accommodates the rotating member (320) and the motor (330) of the launch module (300) includes an inlet (341) formed on one side and an outlet (342) formed on the other side as shown in FIG. 3, so that the metal ball (310) can move along the inlet (341) to smoothly insert the metal ball (310) between one of the rotating members (320) and the other, and the metal ball (310) can be launched without interference by the housing (340) through the outlet (342).

[0064] Meanwhile, the shooting and drop dual-type impact test device (A) according to the present invention can control the launch speed of the metal ball (310).

[0065] That is, the launch module (300) of the present invention includes a controller, and since the rotational speed of the motor (330) can be controlled by the controller, the rotational speed of the rotating member (320) that rotates by the transmission of rotational force of the motor (330) can be controlled as the rotational speed of the motor (330) increases or decreases, thereby allowing the launch speed of the metal ball (310) to be controlled.

[0066] Therefore, local impact tests can be performed under various conditions by controlling the launch speed of the metal ball (310) by the controller.

[0067] In addition, the shooting and drop dual-type impact test device (A) according to the present invention can fire metal balls (310) having various diameters.

[0068] That is, the launch module (300) of the present invention includes a control member, and since the gap between one of the rotating members (320) and another can be adjusted by the control member, the launch of metal balls (310) of various diameters can be achieved by rotating the rotating members (320) as the gap between one of the rotating members (320) and another is widened or narrowed.

[0069] Therefore, local impact tests can be performed under various conditions by adjusting the spacing between the rotating members (320) by the adjustment device.

[0070] The present invention, as described above, is not limited to the embodiments described above and may be modified within the scope that does not deviate from the essence of the invention claimed in the claims, and such modifications fall within the scope of protection of the present invention as defined by the claims below.

[0071] This invention is the result of the 2025 Mokpo National University Glocal College Grant Project, which was funded by the Ministry of Education and supported by the National Research Foundation of Korea. Explanation of the symbols

[0072] 10 : Foundation surface 11 : Groove 20 : Psalm 100 : Frame 110 : Ladder 200 : Lift Crane 210 : Heavy body 220 : Winch 300 : Launch Module 310 : Metal Ball 320 : Rotating member 330 : Motor 340 : Housing 341 : Input port 342 : Outlet 350 : Auxiliary frame A: Impact testing device

Claims

Claim 1 A shooting and drop dual-type impact testing device comprising: a frame positioned to extend upward from a base surface; a lift crane positioned at the top of the frame, which drops a weight of a set load to impact a specimen positioned at the bottom of the frame; and a launch module connected and installed at a point between the bottom and top of the frame, which launches a metal ball of a set load to impact the specimen; wherein a free-fall impact test and a local impact test are selectively performed as the dropping of the weight by the lift crane and the launching of the metal ball by the launch module are selectively performed, and wherein the launch module comprises: a rotating member positioned facing each other at a distance; a motor that transmits rotational force to each of the rotating members; and a housing that accommodates the rotating members and the motor. Claim 2 A shooting and drop dual impact testing device according to claim 1, characterized in that the frame is located on the upper part of a groove formed on the base surface. Claim 3 A shooting and drop dual impact testing device according to claim 1, characterized in that the specimen is seated on the bottom surface of a groove formed on the base surface. Claim 4 A shooting and drop dual-type impact testing device according to claim 1, characterized in that the lift crane includes a winch for winding or unwinding a rope extending from the weight body. Claim 5 delete Claim 6 A shooting and drop dual-type impact testing device according to claim 1, characterized in that the housing includes an inlet formed on one side and an outlet formed on the other side. Claim 7 A shooting and drop dual-type impact testing device, characterized in that, in claim 6, the discharge port is formed on one side of the housing and is formed on the side facing the specimen. Claim 8 A shooting and drop dual-type impact testing device according to claim 1, characterized in that the launch module further includes a controller for controlling the rotational speed of the motor. Claim 9 A shooting and drop dual-type impact testing device according to claim 1, characterized in that the launch module further includes a control member for adjusting the gap between one of the rotating members and the other.

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