JP2009103644A - Torsion tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torsion tester for adjusting the height of a fixed-side holder without using a sensor, etc. for detecting the length of a specimen. <P>SOLUTION: This torsion tester includes a turning-side holder 3 for holding a lower end part of the specimen 2, the fixed-side holder 4 for holding an upper end part of the specimen 2, a servomotor (torque loading means) 5 for loading torsional torque on the specimen 2 via the turning-side holder 3, a torsion detector 6 for detecting output torque of the specimen 2 with the torque loaded thereon by the servomotor 5, a lift table 20 supporting the fixed-side holder 4 so that it can be moved up or down, a lifting mechanism 30 for moving the lift table 20 up or down, and a slide height adjustment mechanism 50 for adjusting the height of the fixed-side holder 4. The height of the fixed-side holder 4 can be adjusted via the lifting mechanism 30 and the adjustment mechanism 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a torsion test apparatus for performing a torsion test of various parts and materials.

  Conventionally, as this type of torsion test apparatus, the one disclosed in Patent Document 1 repeatedly applied torsion torque to a specimen (test object) of various parts and materials by a servo motor, and the torque was loaded. In this state, the torsion detector detects the output torque of the specimen and performs a torsional fatigue test or the like.

  In this torsion test apparatus, a servo motor is arranged so as to rotate a specimen around a horizontal axis, and a servo motor, a specimen, and a torsion detector are provided side by side in the horizontal axis direction.

  Each end of the specimen is held by a rotating side holding tool and a fixed side holding tool, respectively, and this rotating side holding tool is connected to a servo motor, while this fixed side holding tool is connected to a torsion detector.

When changing the interval between the rotating side holder and the fixed side holder according to the length of the specimen, the fixed side holder can be manually moved in the horizontal axis direction.
Japanese Unexamined Patent Publication No. 2007-107955

  By the way, in the torsional testing device in which the servo motor, specimen, and torsion detector are arranged in the vertical direction (vertical axis direction), the rotating side holding tool and the fixed side holding according to the length of the specimen. When changing the distance from the tool, it is necessary to move the fixed side holder and the torsion detector in the vertical direction against gravity.

  For this reason, it is conceivable to provide a lifting platform that supports the fixed-side holder so that it can be lifted and a lifting mechanism that automatically lifts and lowers the lifting platform via an actuator. In this case, the length of the specimen is reduced. There is a problem that it is necessary to control the operation of the lifting mechanism using a sensor or the like to detect, and the structure of the torsion test apparatus is complicated, resulting in an increase in product cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a torsion test apparatus that can adjust the vertical position of a fixed-side holder without using a sensor or the like that detects the length of a specimen. And

  The present invention is a torsional test apparatus for applying torsional torque to a specimen, and includes a rotating side holder that holds one end of the specimen, a fixed side holder that holds the other end of the specimen, and this rotation Torque loading means for applying torsional torque to the specimen via the side holder, torsion detector for detecting the output torque of the specimen when torque is loaded by the torque loading means, and raising and lowering the stationary side holder A lifting / lowering base that can be supported, a lifting / lowering mechanism that lifts / lowers the lifting / lowering base, and a slide vertical position adjustment mechanism that adjusts the vertical position of the rotating side holder. Thus, the vertical position of the fixed side holder can be adjusted according to the length of the specimen.

  According to the present invention, when changing the interval between the rotating side holder and the stationary side holder according to the length of the specimen, the vertical position of the lifting platform is adjusted via the lifting mechanism, and then the slide vertical position adjusting mechanism The vertical position of the fixed-side holder is finely adjusted manually by way of. The weight of the slide vertical position adjustment mechanism that is manually operated by the operator is significantly smaller than the weight of the lifting platform, etc., so it is easy to fine-tune the vertical position of the fixed-side holder according to the length of the specimen. Can be done.

  In addition, since it is not necessary to control the operation of the lifting mechanism using a sensor or the like that detects the length of the specimen, the structure of the torsion test apparatus can be prevented from becoming complicated, and the cost of the product can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  In the torsion test apparatus 1 shown in FIG. 1, for example, a torsional torque is applied to a specimen 2 such as an artificial bone by a servo motor 5, and the torsion detector 6 outputs an output torque of the specimen 2 in a state where the torque is loaded. Is detected, and a torsional fatigue test or the like is performed.

  The servomotor 5 repeats forward rotation and reverse rotation by a controller (not shown), and a torsional torque is applied to the specimen 2 by this rotation. The controller performs feedback control to bring the detected torque detected by the torsion detector 6 closer to the set torque.

  As the torque detector 6, various torque detectors using strain gauges, optical sensors, and the like can be used.

  This torsion test apparatus 1 is arranged such that the servo motor 5 rotates the specimen 2 around the vertical axis, and the servo motor 5, the specimen 2 and the torsion detector 6 are provided side by side in the vertical direction. The installation space is reduced.

  The torsion test apparatus 1 includes a rotating side holder 3 that holds the lower end portion of the specimen 2 and a fixed side holder 4 that holds the upper end portion of the specimen 2. The rotating side holder 3 has a jig for detachably holding the lower end portion of the specimen 2, while the fixed side holder 4 has a jig for detachably holding the upper end portion of the specimen 2.

  A servomotor (torque load means) 5 is connected to the rotating side holder 3, while a torsion detector 6 is connected to the fixed side holder 4. A controller (not shown) inputs the detection signal of the detector 6 and controls the operation of the servo motor.

  The rotating side holder 3 is supported by the gantry 10 so as to be rotatable around a vertical axis via a bearing 11, and is connected to the servo motor 5 via a coupling 7.

  As shown in FIG. 2, the fixed side holder 4 is connected to the torsion detector 6 via the slide vertical position adjusting mechanism 50 and the coupling 22.

  In order to adjust the interval between the rotating side holding tool 3 and the fixed side holding tool 4 according to the length of the specimen 2, the lifting table 20 that supports the fixed side holding tool 4, and the lifting table 20 is connected to the motor 34. An elevating mechanism 30 that elevates and lowers by operation is provided.

  The lifting platform 20 is formed in a rectangular shape on a plan view, and is supported so as to be movable up and down via four columns. A pair of screw shafts 31 and a pair of guide shafts 35 that are arranged diagonally to the lifting platform 20 are provided as four columns standing on the gantry 10.

  The screw shaft 31 and the guide shaft 35 are covered with a cylindrical boot 39, and each exposed portion is protected from dust.

  The two screw shafts 31 are interlocked with each other via a timing belt and a pulley (not shown), and when one of the screw shafts 31 is rotationally driven by a motor 34, each screw shaft 31 rotates in synchronization.

  Travel nuts 33 that are screwed onto the screw shafts 31 are provided, and the travel nuts 33 are fixed to the diagonals of the lifting platform 20. As each screw shaft 31 rotates in synchronization, the two travel nuts 33 are moved up and down in synchronization, and the lifting platform 20 is moved up and down.

  Slide sleeves 36 slidably fitted to the respective guide shafts 35 are provided, and the respective slide sleeves 36 are fixed to the diagonal of the lifting platform 20. When the lifting platform 20 moves up and down, each slide sleeve 36 slides with respect to the guide shaft 35 and is kept horizontal so that the posture of the lifting platform 20 does not tilt.

  Each slide sleeve 36 is provided with a slide lock mechanism 37. The slide lock mechanism 37 is a lock that tightens the guide shaft 35 by the operator turning the lever 38 in one direction, locks the slide sleeve 36 against the guide shaft 35, and stops the lifting platform 20 from moving up and down. State. On the other hand, the slide lock mechanism 37 releases the tightening of the guide shaft 35 and allows the slide sleeve 36 to slide relative to the guide shaft 35 when the operator performs an operation of rotating the lever 38 to the other side. And

  When adjusting the vertical position of the elevator 20, the operator operates the lever 38 to bring the slide lock mechanism 37 into the unlocked state, and then operates the controller 34 (not shown) to operate the motor 34 to raise and lower the elevator 20. After the movement of the lifting platform 20 is stopped at an arbitrary position, the lever 38 is operated to bring the slide lock mechanism 37 into the locked state, and the lifting platform 20 is fixed. Thus, the elevating mechanism 30 roughly adjusts the vertical position of the elevating platform 20 by the operation of the operator.

  As shown in FIG. 2, the output shaft 51 of the slide vertical position adjusting mechanism 50 is rotatably supported by the lifting platform 20 via a bearing 21.

  The slide vertical position adjustment mechanism 50 is used by the operator to manually adjust the vertical position of the fixed side holder 4. After the vertical position of the lifting platform 20 is roughly adjusted by the lifting mechanism 30 as described above, the vertical position of the fixed side holder 4 is finely adjusted by the slide vertical position adjusting mechanism 50.

  3A is a transverse sectional view showing the configuration of the slide vertical position adjusting mechanism 50, and FIG. 3B is a longitudinal sectional view.

  The slide vertical position adjusting mechanism 50 includes an output shaft 51 connected to the torsion detector 6, a holder 55 connected to the fixed-side holder 4, and a pair of screw rods 60 screwed to the holder 55. While projecting the plate 53 from the outer peripheral surface 58 of the output shaft 51 in the radial direction, a guide groove 71 for slidably fitting the projecting plate 53 to the holder 55 is formed, and each screw rod 60 is formed in the projecting plate 53. The output shaft 51 is fixed to the holder 55 by pressing.

  4A is a front view of the output shaft 51, FIG. 4B is a plan view of the output shaft 51, and FIG. 4C is a longitudinal sectional view of the output shaft 51. As shown, the output shaft 51 has an upper end portion 64 connected to the coupling 22, a shaft portion 65 supported by the bearing 21, and a lower end portion 66 to which the protruding plate 53 is connected. As shown in FIG. 2, the protruding plate 53 is fastened to the lower end portion 66 of the output shaft 51 via two bolts 69.

  An attachment groove slide lock mechanism 62 into which the protruding plate 53 is inserted is formed at the lower end portion 66 of the output shaft 51, two bolt holes 63 through which the respective bolts 69 are inserted, and screw holes 64 into which the respective bolts 69 are screwed. Is formed.

  5A is a front view of the protruding plate 53, and FIG. 5B is a cross-sectional view of the protruding plate 53. As shown in this figure, the protruding plate 53 is formed in a substantially rectangular flat plate shape, and two holes 67 through which the respective bolts 69 are inserted are formed at the center thereof. In a state where the protruding plate 53 is fastened to the lower end portion 66 of the output shaft 51 via the bolts 69, both end portions of the protruding plate 53 protrude from the outer peripheral surface 58 of the output shaft 51 in the radial direction of the output shaft 51.

  6A is a plan view of the holder 55 as viewed from above, FIG. 6B is a side view of the holder 55, and FIG. 6C is a plan view of the holder 55 as viewed from below. As shown in this figure, the holder 55 is slidable on a cylindrical guide hole 70 slidably fitted to the lower end portion 66 of the output shaft 51 and a protruding plate 53 protruding from the lower end portion 66 of the output shaft 51. And a pair of guide grooves 71 are formed.

  The guide hole 70 is formed in a cylindrical shape that is fitted to the lower end portion 66 of the output shaft 51 with a predetermined gap. The guide hole 70 is formed through the holder 55 in the vertical direction.

  Each guide groove 71 is formed in a slit shape along the protruding plate 53, and slidably fits the protruding plate 53 protruding from the lower end portion 66 of the output shaft 51. Each guide groove 71 opens into the guide hole 70 and is arranged on a straight line across the guide hole 70.

  Each guide groove 71 extends to the lower end of the holder 55, and a bottom portion 72 of the guide hole 70 is formed in a step shape in the middle of the holder 55. When the lower end surface of the output shaft 51 comes into contact with the bottom portion 72, the upward movement of the holder 55 relative to the output shaft 51 is restricted.

  A pair of side surfaces 73 is formed in the holder 55, and two screw holes 57 into which the screw rod 60 is screwed are formed on one side surface. Each screw hole 57 is disposed so as to face the central portion of the protruding plate 53 protruding from the lower end portion 66 of the output shaft 51.

  A flange portion 74 is formed at the lower end portion of the holder 55, and the fixed side holder 4 is fastened to the flange portion 74 as shown in FIG. 1. A plurality of screw holes 75 are formed at equal intervals in the flange portion 74, and bolts (not shown) are screwed into the screw holes 75, and the fixed side holder 4 is fastened to the flange portion 74 via the bolts. The

  As shown in FIG. 2, two beams 76 are fastened to the upper end of the holder 55 via bolts 77. When the upper end surface of the protruding plate 53 abuts on each beam 76, the downward movement of the holder 55 relative to the output shaft 51 is restricted.

  3A is a transverse sectional view of the holder 55 assembled to the output shaft 51, and FIG. 3B is a longitudinal sectional view of the holder 55 similarly. As shown, each guide groove 71 is fitted into the protruding plate 53 with a predetermined gap.

  3B, the holder 55 can move in the stroke range in which the bottom 72 of the guide hole 70 and the beam 76 abut against the protruding plate 53 in the axial direction (vertical direction) of the output shaft 51. it can.

  A lever 81 is formed at the base end of the screw rod 60, and the operator applies a tightening force to the screw rod 60 via the lever 81.

When the specimen 2 is attached to the torsion test apparatus 1, the following procedure is performed.
-The elevator 20 is raised and the holder 55 is raised with respect to the output shaft 51.
-Hold the lower end of the specimen 2 on the rotating side holder 3. As a result, the specimen 2 is stood on the rotating side holder 3.
The elevator 20 is lowered, the elevator 20 is stopped at a position before the fixed side holder 4 contacts the specimen 2, and the elevator 20 is fixed to the gantry 10 via the slide lock mechanism 37. To do. At this time, the holder 55 is held at a position raised with respect to the output shaft 51 via each screw rod 60.
After loosening each screw rod 60, the holder 55 is lowered with respect to the output shaft 51, and the lowering of the holder 55 is stopped at a position where the fixed side holder 4 abuts on the specimen 2 at the upper end of the specimen 2. The output shaft 51 is fixed to the holder 55 by pressing each screw rod 60 against each protruding plate 53.
-Hold the upper end of the specimen 2 on the fixed side holder 4.

  Thus, after holding the upper and lower end portions of the specimen 2 on the rotating side holder 3 and the fixed side holder 4, the torsional testing device 1 is operated, and the servo motor 5 causes the rotating side holder 3 to become the fixed side holder 4. A torsional fatigue test or the like in which the torsional torque is repeatedly applied to the specimen 2 by relative rotation is performed.

  The present invention is a torsional testing apparatus 1 that applies torsional torque to a specimen 2, and includes a rotating side holder 3 that holds one end of the specimen 2 and a fixed-side holding that holds the other end of the specimen 2. A tool 4, a servomotor (torque load means) 5 that applies a torsional torque to the specimen 2 via the rotating side holder 3, and an output torque of the specimen 2 in a state in which the torque is loaded by the servomotor 5 A torsion detector 6 for detecting the lifting / lowering, a lifting / lowering base 20 that supports the fixed-side holder 4 so as to be movable up and down, a lifting / lowering mechanism 30 that lifts / lowers the lifting / lowering base 20, and a slide up / down that adjusts the vertical position of the fixed-side holding tool 4 A position adjusting mechanism 50, and the vertical position of the fixed side holder 4 can be adjusted according to the length of the specimen 2 through the lifting mechanism 30 and the slide vertical position adjusting mechanism 50. To do.

  Thereby, when changing the space | interval of the rotation side holder 3 and the fixed side holder 4 according to the length of the test body 2, after adjusting the vertical position of the lifting platform 20 roughly by the lifting mechanism 30, the slide vertical position The adjustment mechanism 50 finely adjusts the vertical position of the fixed side holder 4. Since the weight of the slide vertical position adjusting mechanism 50 that is manually operated by the operator is much smaller than the weight of the lifting platform 20 or the like, the vertical position of the fixed side holder 4 is finely adjusted according to the length of the specimen 2. Can be done easily.

  Further, since it is not necessary to control the operation of the elevating mechanism 30 using a sensor or the like that detects the length of the specimen 2, the structure of the torsional testing apparatus 1 can be avoided from being complicated, and the cost of the product can be reduced. .

  In the present embodiment, the slide vertical position adjusting mechanism 50 includes an output shaft 51 coupled to the torsion detector 6, a holder 55 coupled to the stationary holder 4, and a screw rod 60 that is screwed into the holder 55. And a projecting plate 53 projecting radially from the outer peripheral surface 58 of the output shaft 51 is provided, and a guide groove 71 is formed in the holder 55 so that the projecting plate 53 is slidably fitted. The output shaft 51 is fixed to the holder 55 by pressing against the protruding plate 53.

  Thereby, the relative rotation between the holder 55 and the output shaft 51 is stopped by the protruding plate 53 fitted in the guide groove 71, and the output torque of the specimen 2 is accurately transmitted to the torsion detector 6.

  By changing the screwing position of the screw rod 60, the screw rod 60 is pressed against the protruding plate 53 to fix the output shaft 51 to the holder 55, and the screw rod 60 is separated from the protruding plate 53. On the other hand, the operation of moving the output shaft 51 can be easily performed.

  While the protruding plate 53 protrudes in the radial direction from the outer peripheral surface 58 of the output shaft 51, the guide groove 71 is formed in the holder 55 so that the protruding plate 53 is slidably fitted. It becomes unnecessary and the cost of the product can be reduced.

  In the present embodiment, the holder 55 is formed with a guide hole 70 for slidably fitting the output shaft 51, and the pair of guide grooves 71 are opened in the guide hole 70. In the state where the holder 55 is supported on the same axis, the screw rod 60 is pressed against the protruding plate 53 and the output shaft 51 is fixed to the holder 55, whereby the rotating side holder 3 and the fixed side holder 4 are fixed. And the mounting accuracy of the specimen 2 can be secured.

  In the present embodiment, the flange portion 74 is formed at the lower end portion of the holder 55, and the fixed side holder 4 is attached to the flange portion 74. Therefore, depending on the shape, size, etc. of the specimen 2, the fixed side holder 4 can be easily replaced.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The torsion test apparatus of the present invention can be used for a torsion test of various parts and materials.

1 is a front view of a torsion test device showing an embodiment of the present invention. The front view of a slide up-and-down position adjustment mechanism etc. similarly. Sectional drawing of a slide up-and-down position adjustment mechanism similarly. Similarly, a front view, a plan view, and a sectional view of the output shaft. The front view and sectional drawing of a protrusion board similarly. Similarly, a front view and a plan view of the output shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Torsion test apparatus 2 Specimen 3 Rotation side holder 4 Fixed side holder 5 Servo motor (torque load means)
6 Torsion Detector 20 Lifting Table 30 Lifting Mechanism 50 Slide Vertical Position Adjustment Mechanism 51 Output Shaft 58 Outer Peripheral Surface 53 Projection Plate 55 Holder 60 Screw Rod 71 Guide Groove

Claims (4)

A torsion test device for applying a torsion torque to a specimen,
A rotating side holder for holding one end of the specimen;
A fixed-side holder for holding the other end of the specimen,
Torque loading means for applying a torsional torque to the specimen via the rotating side holder,
A torsion detector for detecting the output torque of the specimen in a state in which torque is loaded by the torque load means;
A lifting platform that supports the fixed-side holder so as to be movable up and down;
An elevating mechanism for elevating the elevating platform;
A slide vertical position adjustment mechanism that adjusts the vertical position of the fixed-side holder,
A torsional testing apparatus characterized in that the vertical position of the fixed-side holder can be adjusted according to the length of the specimen through the lifting mechanism and the slide vertical position adjusting mechanism. The slide vertical position adjusting mechanism is
An output shaft coupled to the torsion detector;
A holder coupled to the fixed-side holder;
A screw rod screwed to the holder,
While providing a protruding plate that protrudes radially from the outer peripheral surface of the output shaft,
Forming a guide groove in which the projecting plate is slidably fitted to the holder;
The torsion test apparatus according to claim 1, wherein the output shaft is fixed to the holder by pressing the screw rod against the protruding plate. A guide hole for slidably fitting the output shaft is formed in the holder,
3. The torsion test apparatus according to claim 2, wherein the pair of guide grooves are opened in the guide holes. Forming a flange at the lower end of the holder;
The torsion test apparatus according to claim 2 or 3, wherein the fixed-side holder is attached to the flange portion.

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