JP3735963B2 - Impact test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impact test apparatus for portable information processing apparatuses such as personal computers and word processors.
[0002]
[Prior art]
A portable information processing device often causes the device to be inadvertently hit by an object or dropped on the floor or the ground, especially when being carried. There is a demand for products that can withstand such impacts. For this purpose, it is necessary to test the impact resistance of the product.
In such a test, there is generally performed a method in which a test object is naturally dropped from a predetermined height onto a collision surface and the impact when the collision occurs is measured. However, with this method, it is difficult to obtain an accurate measurement value because the posture when the test object collides differs for each measurement. In view of this, the present applicant has proposed a drop test apparatus capable of controlling the posture when the test object collides with the collision surface in Japanese Patent Application No. 8-136787.
[0003]
In this prior art, the linear guide (rail) supports the hand (holding part) so that it can fall, and the hand releases the holding immediately before the object to be measured collides with the collision surface. The posture of the test specimen was controlled.
[0004]
[Problems to be solved by the invention]
In the above-described prior art, the holding part is naturally dropped, in other words, freely dropped. Therefore, in order to change the impact force applied to the test object, the height of the holding part is changed. As a result, when trying to obtain a large impact force, the linear guide (rail) became long, and the test apparatus had to be large.
[0005]
An object of the present invention is to provide a new impact test apparatus that can change the impact force during the impact test and can be downsized.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a holding portion that detachably holds a test object, a second guide portion that movably supports the holding portion, and a first guide portion that movably supports the second guide portion. A drive unit that drives the holding unit and the second guide unit along the first guide unit, a collision unit that the test object collides with, control of an opening timing of the holding unit, and the first guide There is provided an impact test apparatus comprising a control unit that controls a drop speed between the first guide unit and the second guide unit. Therefore, it is possible to increase the falling speed of the test object by configuring the guide portion of the holding portion in two stages .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
<First embodiment>
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an impact test apparatus.
The impact test apparatus 1 is roughly divided into six components. 2 is a base constituting the base of the testing machine, 3 is a support column that guides the holding unit to be movable, 4 is a collision unit that is provided above the base 2 and collides with a test object, and 5 is a test that can move the support column up and down. A holding unit that detachably holds an object, 6 is a control unit that controls the dropping speed of the holding unit and the opening timing of the test object in the holding unit, and 7 is a driving unit that drives the holding unit along the support column. The base 2 forms the base of the impact test apparatus 1 and supports the entire apparatus. A support column 3 is vertically supported at the center of the base 2.
[0008]
The column 3 is provided with a rail 31 for moving the holding unit 5 on the surface.
The collision part 4 is provided on the upper part of the base 2 and sandwiches both side surfaces of the column 3 with screws of the fastening part 42. And the position can be freely set by loosening the screw of the fastening portion 42, moving in the vertical direction, and tightening the screw again. A collision object receiving plate 41 is laid on the upper surface of the collision unit 4 in a replaceable manner. The collision object receiving plate 41 is a plate-like object using a material such as an iron plate, a concrete plate, a wood plate, a rubber plate, an asphalt plate, a tile, and the like, and the condition for absorbing the impact force at the time of collision can be changed.
[0009]
The holding part 5 is movable in sliding contact with the rail 31 of the support column 3.
The control unit 6 collects the up-and-down movement of the holding unit 5, the opening / closing operation of the gripping unit 51, which will be described later, and impact test data such as strain gauge 71 data and acceleration sensor 72 data.
FIG. 2 shows the configuration of the drive unit 7.
The drive unit 7 includes a fixed side and a movable side.
[0010]
The fixed part is provided with a rail 31 on a support column 3 having an H-shaped groove. The rail 31 has a plurality of magnet bodies in which N poles and S poles are alternately arranged.
The convex portion of the movable table 50 meshes with the H-shaped concave groove of the support column 3 and is in sliding contact with the rail 31. The shape of the movable table 50 is a metal box. The box has an armature core. The armature core is a bobbin wound around a coil L, and a lead wire P at the tip of the coil L is connected to a three-phase AC power source. The control unit 6 can control the moving speed by controlling the frequency of the three-phase AC power supply and the moving direction by switching the phase order of the three-phase AC power supply.
[0011]
FIG. 3 is a detailed explanatory view showing the shape of the holding portion.
The holding unit 5 includes a grasping unit 52 and two grasping units 51.
The grasping part 52 is provided with a concave fitting part 53 on the opposite surface in contact with the movable table 50. Two gripping portions 51 are provided so that one end of the gripping portion 51 is fitted to the fitting portion 53. The two gripping parts 51 can be moved in the direction of arrow v by a command from the control part. The movement direction is controlled so that the two gripping portions 51 move outward or inward from each other. Therefore, the interval H between the two gripping portions 51 can be increased or decreased. A test object is held at this interval H.
[0012]
A plurality of pressure sensors 55 are provided on the inner surface of the grip portion 51 facing each other, that is, the surface that holds the test object in contact. This pressure sensor 55 is for sensing the pressure between the gripping part 51 and the test specimen and controlling the holding strength of the test specimen when the test specimen is sandwiched at the interval H between the two gripping parts 51. .
In addition, a plurality of air ejection holes 56 are provided on the inner surfaces of the gripping portion 51 facing each other. The air ejection holes 56 eject air from the holes 56 when the pair of grip portions 51 are opened. Thereby, even when there is a difference in the timing at which both gripping parts 51 are separated from the test object, the test object can be supported by air, so that the falling posture of the test object can be kept stable.
[0013]
FIG. 4 is a front view when the test object 8 is sandwiched between the gripping portions 51. Specifically, the test object 8 is a personal computer, a word processor, or the like.
A plurality of strain gauges 71 and acceleration sensors 72 are attached to the test object 8 at predetermined positions. The strain gauge 71 and the acceleration sensor 72 are connected to the control unit 6. The data of the strain gauge 71 and the data of the acceleration sensor 72 are collected by the control unit 6. The deformation amount per unit weight is investigated with the strain gauge 71, and the impact force at the time of collision is investigated with the acceleration sensor 72.
[0014]
<Explanation of impact test operation>
In starting the test, first, the test object 8 is attached to the holding portion 5. That is, the interval H between the two gripping portions 51 is set to be slightly wider than the width of the test object 8, and the test object 8 is inserted into this interval H in a desired posture, for example, diagonally or horizontally. Then, the controller 6 instructs to narrow the interval between the gripping parts 51. When the pressure sensor 55 causes the contact pressure between the grip 51 and the test object 8 to reach a predetermined pressure value, the closing operation of the grip 51 is stopped.
[0015]
Next, as shown in FIG. 1, the height difference between the colliding object receiving plate 41 and the test object 8 is set to a test condition value, for example, the height of an office desk or an average height of 80 cm when a person carries an apparatus. Then, the controller 6 is instructed to the descent speed value of the holding unit 5, for example, 1.8 m / s. Also, commands to collect strain gauge data and acceleration sensor data are instructed.
And the holding | maintenance part 5 starts a fall at the speed | rate designated in the state which hold | maintained the test article 8. FIG. Then, the control unit 6 issues an opening command to the grip unit 51 when the test object 8 is lowered from the collision object receiving plate 41 to about 20 cm above. The gripper 51 widens the interval according to the command and opens the test object 8. The test object 8 falls and collides with the collision object receiving plate 41 on the collision part 4.
[0016]
The data of the strain gauge 71 and the data of the acceleration sensor 72 during the descent and the collision are collected by the control unit 6. Data is analyzed after the impact test and used to check the strength of the product.
<Second embodiment>
FIG. 5 shows a second embodiment according to the present invention. A movable portion 43 is supported to be movable with respect to the rail 42 of the support column 41, and a holding portion 45 is supported to be movable with respect to a rail 44 fixed to the movable portion 43. The movable unit 43 is driven with respect to the rail 42 by the first driving unit, and the holding unit 45 is driven with respect to the rail 44 by the second driving unit. Thus, by simultaneously driving and dropping the first drive unit and the second drive unit, it is possible to further increase the falling speed of the holding unit 45 with respect to the configuration of the first embodiment. A commercially available linear drive rail has a limit of 1 to 2 m / s, but a speed of 3 to 4 m / s can be obtained by using the above two-stage configuration. This drop speed is equal to that of a natural drop from a position of 1.5 m.
[0017]
<Other examples>
The collision part may be shared by the base 2 that forms the base of the testing machine. The number of components is also reduced by sharing. Further, the accuracy of the impact test is not lowered.
[0018]
【The invention's effect】
As described above, the impact test apparatus configured as in the present invention can change the impact force that the test object receives at the time of collision by controlling the drop speed of the holding part with the drive part. The size can be reduced without the need for extra rails.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an entire impact test apparatus according to the present invention. FIG. 2 is a perspective view of a drive unit according to the present invention. FIG. 3 is a perspective view of a holding unit according to the present invention. FIG. 5 is a front view showing a state in which the holding part holds the test object. FIG. 5 is a side view of the main part of an impact test apparatus showing another embodiment according to the invention.
1 Impact test equipment,
2 base,
3 struts,
4 Collision part,
5 holding part,
6 Control unit,
7 Drive unit,
8 Test article.

Claims (1)

A holding part for holding the test article in a detachable manner;
A second guide part that movably supports the holding part;
A first guide part that movably supports the second guide part;
A drive unit that drives the holding unit and the second guide unit along the first guide unit;
A collision portion where the test object collides;
An impact test apparatus comprising: a control unit that controls a release timing of the holding unit and a dropping speed of the first guide unit and the second guide unit .

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