JP4522250B2 - Rotational impact test equipment - Google Patents

Description

  The present invention relates to a rotational impact test apparatus.

  For example, as a rotational impact test apparatus for testing resistance to impact force with respect to an electronic device such as a personal computer, the one described in Patent Document 1 is known. In this conventional example, the device under test is fixed to a shaker that is vibrated at a predetermined frequency and amplitude with the excitation signal generated by the shaker control device, and a performance test is performed under the excitation condition. Is called.

  However, in the above-described conventional example, the impact force applied by the shaker is mainly at the moment of reversal during the reciprocating linear motion, for example, to test performance degradation when the electronic device is dropped from the desktop. There is a problem that is not suitable.

In addition, drop testers are examples of impact testing machines that apply a one-way impact load to the DUT from a stationary state, but in this case, it is difficult to manage impact conditions, and accurate data collection is difficult. There is a problem that.
JP-A-6-290572

  The present invention has been made to solve the above drawbacks, and an object of the present invention is to provide a rotational impact test apparatus that can easily acquire accurate data.

  In the impact test to the device under test 10, an impact force in the rotating direction is applied to the rotary table 7 that fixes the device under test 10 by the impact force applying means 9, and the operation of the device under test 10 under the impact condition is performed. Confirmed. In the present invention in which the impact test is performed by rotating the rotary table 7 with an impact load, the impact load direction and the impact load can be easily managed. Therefore, the impact conditions can be easily reproduced, and highly reliable data can be obtained. become.

  Further, the roller bearing portion 4 for supporting the rotary table 7 holds a plurality of tapered roller rows 1 between the inner and outer rings 2 and 3 so as to be able to bear an axial load in the opposite direction in a complementary manner, like a double row tapered roller bearing. Therefore, shakiness in the axial direction is prevented. As a result, the impact force of the axial component is not applied to the DUT 10 even when the impact angle of the impact force applying means 9 to the impacted portion 8 includes a component in the axial direction. Strict management of conditions is possible and test reliability is increased.

  Furthermore, since the roller bearing portion 4 is free from rattling against the load in the axial direction and can bear the load against the bidirectional axial load, even if the collision angle includes a component in the axial direction. The roller bearing part 4 is not damaged. As a result, long-term stable use is possible.

  According to the present invention, it is possible to improve measurement accuracy and use it for a long time.

  1 and 2 show an embodiment of the present invention. In the figure, reference numeral 6 denotes a base. On the base 6, a rotary table 7 and a straight hammer-shaped hammer rod serving as an impact force applying means 9 are arranged. A collision pad 9 a formed of, for example, a hard synthetic resin material is fixed to the tip of the hammer rod 9, and is driven in a straight direction by the hammer rod driving device 11.

  In this embodiment, the hammer rod drive device 11 has a compression spring 11a inside, and resists the urging force of the compression spring 11a by applying a negative pressure to the air chamber 11b by an air pump (not shown). The hammer rod 9 can be pulled into the position shown in FIG. When the negative pressure is eliminated from this state, the hammer rod 9 returns to the original position by the restoring force of the compression spring 11a.

  Although FIG. 1A shows a method for realizing the contraction force of the compression spring 1a by reducing the pressure in the air chamber 11b, the pressure in the air chamber 11b can be changed by changing the position of the air chamber 11b. Thus, various modifications such as bending the compression spring 11a are possible.

  On the other hand, the rotary table 7 is pivotally supported by the base 6 via a roller bearing portion 4 described later so as to be horizontally rotatable. The rotary table 7 is provided with a large number of fixing holes 7a for fixing the device under test 10. Further, the rotary table 7 is provided with a stopper projection 7b and a colliding portion 8. The stopper projection 7b and the colliding portion 8 are projected from the outer peripheral surface of the rotary table 7 in the radial direction. As shown in FIG. 1, the stopper projection 7b determines the initial rotation position of the rotary table 7 in contact with the initial position restricting portion 6a provided on the base 6 side. When in the initial rotation position, the hammer rod 9 is positioned so as to interfere with the movement trajectory (T) of the collision pad 9a.

  Further, the base 6 is provided with a terminal position restricting protrusion 6b and a guide pole 12. The end position restricting protrusion 6 b comes into contact with the stopper protrusion 7 b of the rotary table 7 and the collision target part 8 and restricts the rotation range of the rotary table 7. The guide pole 12 holds the cable guide 12 a at a position higher than the upper surface of the rotary table 7, and holds a cable or the like that connects the device under test 10 fixed to the upper surface of the rotary table 7 and a measurement device (not shown).

  In the impact test using the above impact tester, the test object 10 such as a personal computer is fixed on the rotary table 7, and then the hammer is moved from the initial state shown in FIG. 1 (a) to the hammer shown in FIG. 1 (b). This is done by popping out the kite 9. As the hammer rod 9 jumps out, the collision pad 9a at the tip of the hammer rod 9 collides with the colliding portion 8 of the rotary table 7, and the rotary table 7 rotates by an impact force, and an impact load is applied to the DUT 10. FIG. 2A shows a state where the turntable 7 is rotated. The impact force applied to the test body can be changed by adjusting the output of the hammer rod driving device 11.

  Details of the roller bearing portion 4 that supports the rotary table 7 are shown in FIGS. The roller bearing portion 4 has an outer ring 3 that also serves as a housing, and is fixed to the base 6 by a fixing flange 3 a that protrudes outward from the outer ring 3. 2B and 3, reference numeral 13 denotes a bolt for fixing the fixing flange 3 a to the base 6.

  On the inner periphery of the outer ring 3, a recess is formed with the raceway surface 3 b that opens outward as the side wall surface at the center in the height direction. As shown in FIG. 3, the raceway surface 3 b is formed by a conical surface whose apex 14 is located on the rotation center line (C) of the turntable 7.

  Two inner ring subassemblies 15 and 15 are fitted into the recesses of the outer ring 3. 3 and 4, the inner ring subassembly 15 includes an inner ring 2 having a shaft insertion hole 2a through which the rotation shaft (shaft portion 5) of the rotary table 7 is inserted, and a plurality of tapered rollers 15a, 15a,. And have. On the outer peripheral surface of the inner ring 2, a raceway surface 2 b is formed which is a conical surface whose apex coincides with the apex of the outer ring side raceway surface 3 b in a state where the inner ring subassembly 15 is incorporated in the outer ring 3.

  The tapered roller 15a has a frustoconical shape whose side walls are in line contact with the raceway surfaces 2b, 3b of the inner and outer rings 2, 3, and is held at a predetermined interval by the retainer 15b to constitute the tapered roller row 1.

  As shown in FIG. 3, the rotary shaft 5 of the rotary table 7 is inserted into the shaft insertion holes 2a of the two inner ring subassemblies 15 fitted to the outer ring 3, and then tightened with a fastening nut 16 at the lower end. Is done. By fastening the fastening nut 16, the raceway surfaces 2b, 3b of the inner and outer rings 2, 3 are pressed against the tapered roller rows 1 in each row, and in this state, the rotation shaft 5 is completely restricted from moving in the axial direction. As a result, even if the axial direction component is included in the collision angle of the collision pad 9a with the collision target 8 described above, only the horizontal impact force is applied to the DUT 10 because the rotary table 7 rotates horizontally. Is done.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows this invention, (a) is a top view which shows the state which pulled in the impact-force provision means in a hammer drive device, (b) is a top view which shows the state made to collide with a rotary table. It is a figure which shows the state which the turntable rotated, (a) is a top view, (b) is the 2B-2B sectional view taken on the line of (a). It is sectional drawing of a roller bearing part. It is a figure which shows an inner ring | wheel subassembly, (a) is a side view, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tapered roller row | line | column 2 Inner ring | wheel 3 Outer ring | wheel 4 Roller bearing part 5 Shaft part 6 Base 7 Rotary table 8 Impacted part 9 Impact force provision means

Claims (1)

Axial load in the opposite direction can be complementarily borne. The shaft is rotatably supported on the base via a roller bearing that holds a plurality of tapered roller arrays between the inner and outer rings , and is fixed to fix the DUT. A large number of holes are provided to fix the device under test to the upper surface, and a cable guide for holding a cable or the like for connecting the device under test and the measuring instrument is positioned higher than the upper surface by the guide pole provided in the base. a rotary table that will be held in,
An impact force applying means for applying an impact rotational force to the rotary table by colliding with a collided portion formed on the rotary table;
Rotational impact test apparatus having

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