JP2528695B2 - Drop test device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a drop test device for use in shock-absorbing tests such as shock-absorbing packaging design, selection of packaging materials, and other packaging contents.

[Conventional technology]

An example of the above drop test device is shown in FIG.

In such a drop test device, a cradle-attached frame 42 is provided on a pedestal 41 so that it can be driven up and down, and the drop test target
An L-shaped pedestal 45 having 43 receiving face plates 44 is attached to the horizontal axis P.
The pedestal 45 is pivotally attached to the pedestal-attached frame 42 so that the pedestal 45 can be oscillated and moved to the outside of the drop trajectory of the drop test object 43, and the cradle 45 can be moved around the fall trajectory. An urging means 46 for urging and moving to the outside is provided across the pedestal 45 and the pedestal attachment frame 42, and a holding means 47 for holding the pedestal 45 in a predetermined posture against the urging means 46. The cradle mounting frame 42 is releasably held, and the urging means 46 is further provided with a force accumulating means 48 for accumulating the urging force for moving the cradle. A buffer means 49 for stopping the buffer at a predetermined position outside the locus is provided.

Then, the conventional urging means 46 for urging and moving the pedestal 45 to the outside of the drop trajectory of the drop test object 43 is the pedestal.
Brackets 50 and 50 are provided on each of the bracket 45 and the pedestal attachment frame 42, and a tension coil spring 51 is connected across both brackets 50 and 50, and the force accumulating means 48 is, for example, a trunnion type cylinder 52. Is pivotally attached to the pedestal attachment frame 42, while an arm 54 having a roller 53 at its free end is pivotally attached to the pedestal 45, and
The free end of 54 and the tip of the piston rod 55 of the cylinder 52 are pivotally connected to each other. In the state shown by the solid line in FIG. 5, the pedestal 45 mounts the drop test object 43 in a predetermined manner. It is in a standing posture, and the predetermined posture of the pedestal 45 is held by the holding means 47, and the pedestal 45 is applied with a pulling urging force by the urging means 46 to the outside of the falling trajectory. Is in a state.

Then, the drop test object is placed on the receiving surface plate 44 of the receiving table 45.
When the holding means 47 is released from holding the pedestal 45 in a state in which the holding means 47 is mounted as specified, the pedestal 45 pulls the urging force of the urging means 46 as shown by a phantom line in FIG. Is rapidly rocked out of the fall locus and abuts against the buffer means 49 at the rocking movement end to stop buffering. On the other hand, the drop test object 43 freely falls, so that the drop test object 43 A drop test is performed on.

Then, the cylinder 52 of the force accumulating means 48 is extended, and the roller 53 on the free end side of the arm 54 is brought into contact with the back surface of the pedestal 45 and pushed to pull the urging means 46. The pedestal 45 is swung against the force and the holding means 47 is provided when the pedestal 45 is returned to its original predetermined posture.
By holding the posture of the pedestal 45 and contracting the cylinder 52 of the force accumulating means 48 by means of the above, the state ready for the next drop test shown by the solid line in FIG. 5 comes to appear. ing.

[Problems to be Solved by the Invention]

By the way, in the drop test apparatus having the above structure, when the tension coil spring 51 is contracted when the pedestal 45 is rapidly moved to the outside of the drop trajectory, the connecting portion b of the tension coil spring 51 to the pedestal 45 is By drawing an arc around the horizontal axis P of the pedestal 45, the tension coil spring 51 vibrates up and down, causing an unpleasant vibration noise.

In addition, depending on the design of the tension coil spring 51, a design is made to narrow the gap 1 between the coil wires of the tension coil spring 51 in a state where the pedestal 45 is buffered and stopped outside the fall trajectory. In the device, a part of the coil wire collides violently when the buffer of the pedestal 45 is stopped, and a large blasting noise is emitted.

Further, the tension coil spring 51 is formed by bending the hook-shaped connecting portions b and b at both ends of the coil portion a, and the bending portion c between the both a and b is the weakest in terms of strength. Therefore, when the above-mentioned drop test is repeatedly performed, the bent portion c may be fatigue fractured, which may lead to an extremely dangerous situation in which the fractured pieces scatter around. There was

On the other hand, the buffer means 49 for stopping the buffer of the pedestal 45 outside the falling trajectory is provided with a bracket 56 on the pedestal mounting frame 42, a shock absorber 57 is attached to the bracket 56, and the shock absorber 57 is shock-absorbed. A cushioning member 59 made of synthetic resin or rubber is provided at the tip of the rod 58 for cushioning.
From the viewpoints of downsizing and structural strength of the cushioning element, it is desirable to make the cushioning stroke of the cushioning rod 58 large.

However, while the cushioning rod 58 linearly moves by the cushioning stroke and cushions, the cradle 45 makes a circular motion about the horizontal axis P, so that the cradle 45 and the cushioning tool 59 are combined. The abutting surface changes from time to time, and as the cushioning stroke is increased, a large slide is generated on the abutting surface between the cushioning tool 59 and the pedestal 45 that swings. The rod 58 may be bent due to a large bending stress applied to the rod 58, and the predetermined cushioning function may be lost.

Furthermore, in order not to exert any external force on the drop test object 43, the urging force of the urging means 46 is made strong, and the pedestal 45 can be rapidly moved out of the fall trajectory. Although it is essential, a strong and strong attachment structure for the biasing means 46 and the cushioning means 49 is required for that purpose, which causes an increase in the cost of the entire apparatus.

It is an object of the present invention to eliminate all of the above inconveniences by a simple improvement, and to provide a safe and inexpensive drop test apparatus.

[Means for solving the problem]

In the drop test apparatus according to the present invention for achieving the above object, a pedestal on which a drop test target is placed is movably provided outside a drop trajectory of the drop test target, and the cradle is used for the drop trajectory. An urging means for urging and moving to the outside is provided, a holding means for holding the pedestal in a predetermined posture against the urging means is releasably held, and an urging force is stored in the urging means. A drop test apparatus provided with a force accumulating means for applying a force and a cushioning means for cushioning and stopping the pedestal at a predetermined position outside the fall trajectory, wherein the urging means comprises a compression coil spring and the compression coil. A cover for covering the spring, a rod inserted into the compression coil spring in the cover, and a spring receiving member connected to the insertion end of the rod and one end of the cover, respectively. With the penetrating end of the biasing means The rod end on the opposite side is pivotally attached to the pedestal and the cover is pivotally attached to the pedestal-attached frame so as to be swingable about horizontal axes parallel to each other, and the buffering direction of the buffering means is set in the moving direction of the rod. It is characterized in that the buffer means is attached to the other end side of the cover.

[Action]

According to the above characteristic configuration, the pedestal is moved to the outside of the drop trajectory as the compression coil spring extends inside the cover, and the compression coil spring is moved along with the swing of the pedestal. Oscillates together with the cover, but the compression coil spring itself does not generate vibration-related vibrations, and the coil wires do not collide with each other. The fact that they are covered synergistically suppresses the generation of noise.

In addition, since the compression coil spring has no portion vulnerable to repeated expansion and contraction, the compression coil spring is less likely to be broken, and the compression coil spring is covered with a cover. Safety is achieved.

Further, since the buffering direction of the buffering means and the moving direction of the rod of the biasing means are the same direction, slippage does not occur even if the buffering stroke is increased, and as a result, the durability of the buffering means becomes high. In addition, since the cushioning means is integrated with the biasing means, the cost of the mounting structure can be simplified.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show the entire drop test apparatus, in which 1 is a pedestal, and two pairs of left and right columns 2 ... Are erected on a base 3 and the upper ends of the columns 2 ... Members 4 such as strips and channels are connected to each other, and a reinforcing member 5 is obliquely provided across the base 3 and the rear support 2. And, in the surface portions of the front columns 2 and 2 facing each other,
Vertical guide rails 6, 6 are provided.

Reference numeral 7 is a cradle-attached frame that can be raised and lowered with respect to the gantry 1, and is a pair of left and right frame portions formed by bending and joining square pipes.
a, 7a are connected by a plurality of plate-shaped members 7b ... And the guide rail is provided on the outer surface of the frame portion 7a, 7a.
Guided bodies 8 and 8 for 6 and 6 are provided.

Reference numeral 9 denotes a cradle located at the center between the frame portions 7a, 7a. The receiving surface plate 12 of the drop test object 11 is connected to the horizontal portion 10a of the main body 10 which is L-shaped in side view, and the main body 10 is A horizontal shaft 13 is provided at the upper end of the vertical portion 10b, and the horizontal shaft 13
Is pivotally supported on the left and right frame portions 7a, and as shown in FIG. 3, the pedestal 9 is swingably moved around the horizontal axis P of the horizontal shaft 13 to the outside of the drop trajectory of the drop test object 11. It is free.

Reference numeral 14 is an urging means for urging and moving the pedestal 9 out of the fall trajectory, and 15 is a buffer means for stopping the pedestal 9 outside the fall trajectory by the buffer means 15. The urging means 14 is integrated, and the urging means 14 therein is provided over the pedestal 9 and the pedestal attachment frame 7.

16 is a force accumulating means for accumulating an urging force in the urging means 14. 17 is a predetermined posture of the pedestal 9 against the urging means 14 (for example, a posture in which the receiving face plate 12 is horizontal) The holding means 17 holds the
As shown in the figure, a semi-circular stopper member 18 is provided on the vertical portion 10b of the pedestal 9, and a circular stopper 19 that can be engaged with and disengaged from the concave surface of the stopper member 18 by axial movement. The drop test target 11 on the pedestal 9
The plate-like member 7b of the cradle-attached frame 7 on the mounting side of the
Is mounted via a radial bearing 20 and a bearing holder 21, and a cylinder 22 for moving the stopper 19 in the axial direction is interlockingly connected to the stopper 19, and the stopper 19 is a concave surface of the member to be stopped 18. It is considered that the surface pressure between the two members 19 and 18 is reduced by locking them to the portion.

Reference numeral 23 is a cylinder for driving and elevating the cradle-attached frame 7.

As shown in FIG. 4, a guide mechanism 42 is provided so as to face the holding means 17 so that the cradle 9 can be smoothly oscillated while the rattling of the cradle 9 is suppressed. Is done.

This guide mechanism 42 is provided with a guide rail 43 at a portion opposite to the attachment side of the member to be stopped 18 with respect to the vertical portion 10b of the main body 10, while a bracket is provided on the plate member 7b to which the holding means 17 is attached. A guide roller 45 is provided so as to connect 44 and face the guide rail 43.

Next, the urging means 14, the buffer means 15, and the energy storage means
Explaining the concrete structure of 16, first, the biasing means 14
A plate-shaped member on the side of the biasing means 14 of the cradle-attached frame 7.
7b and the back surface of the pedestal 9 are provided with brackets 24 and 25, respectively, and a cover incorporating a compression coil spring 26.
27 is attached to the bracket 24 on the pedestal-attached frame 7 side, and the end of the cover 27 opposite to the insertion end of the rod 28 inserted into the compression coil spring 26 is located on the rear side of the pedestal 9. To each bracket 25 of the pedestal 9 so as to be swingable about a horizontal axis P ₁ parallel to the horizontal axis P of the pedestal 9, and
Spring receiving members 29, 30 for receiving and supporting the end portion of the compression coil spring 26 are provided at one end side of the cover 27 (the receiving base 9 side) and at the inserted end of the rod 28, respectively. In the state shown in FIG. 3 in which the pedestal 9 is buffered and stopped, the compression coil spring 26 is configured to still have a sufficient compression biasing force.

On the other hand, the buffer means 15 is a buffer rod 32 of the buffer 31.
A shock-absorbing member 33 made of synthetic resin or rubber is provided at the tip of the spring receiving member 30 on the rod 28 insertion end side of the urging means 14 in a state of abutting against the shock-absorbing member 33. The cushioning means 15 is attached to the other end side of the cover 27 so that the cushioning direction of the cushioner 31 is directed to the moving direction of the rod 28 of the urging means 14.

The force accumulating means 16 is provided with a bracket 34 on the plate-like member 7b of the pedestal-attached frame 7, and is swingable about a horizontal axis P ₂ parallel to the horizontal axis P of the pedestal 9, for example, a trunnion type. While the cylinder 35 is pivotally attached to the bracket 34, an arm 37 having a roller 36 at its free end is pivotally attached to the pedestal 9, and the free end of the arm 37 is connected to the cylinder
According to the above-mentioned structure, in which the tip of the piston rod 38 of 35 is pivotally supported so as to be swingable, the drop test target 11 is predetermined on the receiving ninth receiving face plate 12 as shown in FIG. As shown in FIG. 3, the power accumulating means 16 is mounted in the street.
When the cylinder 35 is expanded and contracted to release the holding of the pedestal 9 by the holding means 17, the receiving 9 is rapidly dropped by the compression urging force of the urging means 14 as shown in FIG. The rod 28 of the urging means 14 is abutted against the loosening means 15 via the spring receiving member 30 at its piercing end at the oscillating movement end thereof, and through the rod 28. While the pedestal 9 is buffered and stopped, the drop test target 11 is allowed to fall freely, whereby a drop test is performed on the drop test target.

Then, the cylinder 35 of the force accumulating means 16 is extended and actuated so that the roller 36 on the free end side of the arm 37 abuts against the back surface of the pedestal 9 and pushes the compression force of the urging means 14. By swinging the pedestal 9 against the urging force and holding the posture of the pedestal 9 by the holding means 17 when the pedestal 9 is returned to the original predetermined posture, The state for the next drop test shown in the figure appears.

Although the L-shaped pedestal 9 is configured to be swingable around the horizontal axis P in the embodiment, the pedestal 9 having the receiving face plate 12 or the horizontal portion 10a attached thereto is used as the pedestal 9. The pedestal 9 may be configured to be moved to the outside of the falling trajectory via the parallel four-link mechanism.

〔The invention's effect〕

As described above, according to the drop test device of the present invention,
Since the urging means for moving the cradle for dropping the drop test object to the outside of the drop trajectory is composed of a compression coil spring extending in the cover, the compression coil spring covers the cradle as the cradle swings. Although it oscillates integrally with the compression coil spring, the compression coil spring itself does not generate vibrations, and the coil wires of the spring do not collide with each other due to the structure of the compression coil spring. Further, by covering the compression coil spring with the cover, it is possible to effectively suppress the generation of noise from the biasing means.

Since the compression coil spring has no portion vulnerable to repeated expansion and contraction, the compression coil spring is less likely to be broken over time, and as described above, the compression coil spring is covered with the cover. Thus, double safety is achieved.

Further, by integrating the buffering means with the biasing means, it is possible to simplify the mounting structure for the buffering means and the biasing means, and moreover, the buffering direction of the buffering means in the moving direction of the rod. By making them face to each other, it is possible to prevent slippage between the cushioning means and the member that cushions and abuts against this, despite the swinging of the pedestal, and thus the cushioning rod does not bend. Therefore, it is possible to improve the durability of the cushioning means, and it is possible to take an arbitrarily large cushioning stroke that is desirable from the viewpoint of downsizing of the cushioning means and the structural strength of the cushioning element. The improvement has made it possible to provide a drop test apparatus which is excellent in terms of noise suppression and safety and which is inexpensive.

[Brief description of drawings]

FIG. 1 is a side view of the drop test apparatus, FIG. 2 is a rear view of the drop test apparatus, FIG. 3 is a side view of the drop test apparatus showing a state in which the cradle is moved outside the drop trajectory, and FIG. It is a top view of the principal part which shows a holding means mainly. FIG. 5 is a side view of the conventional drop test device. 7 ... pedestal attachment frame, 9 ... pedestal, 11 ... drop test object, 14 ... biasing means, 15 ... buffering means, 16 ... accumulating means, 17 ... holding means, 26 ... ... compression coil spring,
27 …… Cover, 28 …… Rod, 29,30 …… Spring receiving member, P ₁ …… Horizontal axis.

Claims (1)

(57) [Claims] 1. A pedestal on which a drop test target is placed is movably provided outside a drop locus of the drop test target, and urging means for biasing the pedestal outside the drop locus is provided. And a holding means for holding the pedestal in a predetermined posture against the urging means so as to be capable of holding and releasing, and a urging means for accumulating urging force in the urging means, and the pedestal. A drop test apparatus provided with a buffering means for buffering stopping at a predetermined position outside the drop trajectory, wherein the urging means includes a compression coil spring, a cover for covering the compression coil spring, and a compression in the cover. A rod inserted through the coil spring, and a spring receiving member connected to the insertion end of the rod and one end side of the cover, respectively, and the opposite side of the urging means from the insertion end. The rod end of the pedestal and the cover The frames are pivotally attached to the pedestal-attached frames so as to be swingable about horizontal axes that are parallel to each other, and the buffering means is directed to the moving direction of the rod, and the buffering means is attached to the other end side of the cover. Drop test device characterized by being attached.