JP2014238286A - Displacement gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a displacement gauge capable of positioning both arms by operating one arm, and further accurately clipping a test piece by a contact piece of each arm.SOLUTION: An upper arm 21 is arranged so as to elevate to a shaft 10 and rotate about the shaft 10. On a lower surface of the upper arm 21, a clipping portion 23 which has a pair of contact pieces 51 and 52 for clipping a mark line part on an upper side in a test piece is provided. On a lower surface of the upper arm 21, a mark line setting rod 25 is arranged so as to face downward. A lower arm 22 is arranged so as to elevate to the shaft 10 and rotate about the shaft 10. On an upper surface of the lower arm 22, a clipping portion 24 which has a pair of contat pieces 53 and 54 for clipping a mark line part on a lower side in the test piece is provided. On the lower arm 22, a hole portion 27 engaged with the protrusion 26 provided on the mark line setting rod 25 is formed.

Description

  The present invention relates to a displacement meter for measuring the elongation of a test piece.

  Measure the elongation of the specimen while applying a tensile load to the specimen, and measure the elongation of the specimen in a material testing machine for measuring the relationship between the load applied to the specimen and the elongation of the specimen. For this purpose, a displacement meter, also called an extensometer, is used.

  Such a displacement meter includes a shaft arranged in the vertical direction, an upper arm having a pair of contacts for holding the upper marked portion of the test piece, and a lower mark on the test piece. And a lower arm provided with a pair of contacts for sandwiching the line portion. The upper arm and the lower arm can be moved up and down with respect to the shaft, and are disposed so as to be rotatable around the shaft, so that the position between the holding position and the retracted position for holding the test piece is set. Are individually movable.

  The test piece held by the upper and lower chucks of the material testing machine for applying an elongation load to the test piece is designated as two reference positions for elongation measurement, and a marked line is provided at that position. It has been. When measuring the elongation, the upper marked portion is clamped by the contact of the upper arm, and the lower marked portion is clamped by the contact of the lower arm. Since the upper arm and the lower arm can move up and down with a very light force along the shaft, the upper arm and the lower arm move upward as the upper chuck moves upward and the specimen is pulled and extended. The difference in the moving distance between the upper arm and the lower arm is measured as the amount of elongation of the test piece (see Patent Document 1 and Patent Document 2).

JP 2000-321007 A JP 2001-83056 A

  When executing the material test, the upper arm and the lower arm are moved to the retracted position, and then both ends of the test piece are held by the upper chuck and the lower chuck in the material testing machine. Then, by moving the upper arm and the lower arm individually, the upper marked portion of the test piece is clamped by the contact on the upper arm, and the lower marked portion of the test piece is held on the lower arm. Hold by.

  At this time, the center of the upper marked portion of the test piece must be accurately held by the contact in the upper arm, and the center of the lower marked portion of the test piece must be accurately held by the contact in the lower arm. is there. However, the upper arm and the lower arm move up and down independently of each other and rotate around the shaft, so that the holding operation of the test piece by the contact becomes extremely complicated, and the position adjustment is performed. However, complicated work is required.

  The present invention has been made to solve the above-mentioned problems. By operating one arm, both arms can be easily positioned, and the test piece can be pinched accurately by the contact of each arm. An object is to provide a simple displacement meter.

  The invention according to claim 1 is a displacement meter for measuring the elongation of the test piece, and a pair for sandwiching the shaft arranged in the vertical direction and the upper marked portion of the test piece. A pair of contacts for holding an upper arm that is movable up and down with respect to the shaft and that is rotatable about the shaft, and a lower marked portion of the test piece. A lower arm provided with a contact, capable of moving up and down with respect to the shaft, and pivotable about the shaft; and connecting the upper arm and the lower arm to form the upper arm And a connecting member that matches the rotational angle position of the lower arm with the shaft as a center.

  According to a second aspect of the present invention, in the first aspect of the present invention, the connecting member is a first engagement formed at a tip of a marked line setting bar attached to one of the upper arm or the lower arm. And a second engagement portion formed on the other of the upper arm and the lower arm and engaged with the first engagement portion.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the angular position regulation for regulating a rotational angular position about the shaft of at least one of the upper arm or the lower arm. A member is provided.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the elevating position regulating member for regulating the elevating position of at least one of the upper arm or the lower arm with respect to the shaft. Is provided.

  According to the first aspect of the present invention, the upper arm and the lower arm can be moved synchronously by the action of the connecting member. For this reason, by operating one arm, both arms can be easily positioned, and the test piece can be pinched accurately by the contact of each arm.

  According to the second aspect of the present invention, the marked line for matching the distance between the test piece clamping position by the upper arm contactor and the test piece clamping position by the lower arm contactor with the distance between the marked lines. Since the upper arm and the lower arm can be connected using the setting bar, the apparatus configuration can be simplified.

  According to the third aspect of the present invention, the upper arm and the lower arm are stopped at the angular position suitable for the holding position of the test piece by the upper arm contact and the lower arm contact by the action of the angular position regulating member. It becomes possible to make it. For this reason, it becomes possible to easily perform the work of holding the test piece by the contact.

  According to the fourth aspect of the invention, the upper arm and the lower arm are stopped at the raising / lowering position suitable for the holding position of the test piece by the contact of the upper arm and the contact of the lower arm by the action of the raising / lowering position regulating member. It becomes possible to make it. For this reason, it becomes possible to easily perform the work of holding the test piece by the contact.

It is a schematic diagram showing displacement meter 2 concerning this invention with material testing machine 1. It is a schematic diagram of the displacement meter 2 concerning this invention. It is a perspective view which shows the principal part of the displacement meter 2 which concerns on this invention. It is a perspective view which shows the principal part of the displacement meter 2 which concerns on this invention. It is the fragmentary perspective view which looked at the lower arm 22 from diagonally downward. 4 is a perspective view showing a state where the lower arm 22 is supported by a support block 31. FIG. It is the perspective view which looked at the support block 31 from diagonally upward.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a displacement meter 2 according to the present invention together with a material testing machine 1. In FIG. 1, the reference line setting bar 25 and the support block 31 described later in the displacement meter 2 are not shown.

  The material testing machine 1 is disposed so as to be movable up and down with respect to a frame comprising a pair of left and right columns 12 erected on a base 11 and a cross yoke 13 spanning the left and right at the top of the pair of columns 12. The crosshead 14 is provided. The cross head 14 is configured to move up and down by the action of a screw rod built in the pair of columns 12. On the base 11, a lower chuck 17 for holding the lower end portion of the test piece 100 is disposed. On the other hand, the upper chuck 16 for gripping the upper end portion of the test piece 100 is disposed on the cross head 14 via the load cell 15.

  In this material testing machine 1, a tensile force is applied to the test piece 100 by moving the crosshead 14 upward while holding the upper and lower ends of the test piece 100 by the upper chuck 16 and the lower chuck 17. At this time, the tensile load applied to the test piece 100 is measured by the load cell 15 connected to the upper chuck 16. Further, the elongation of the test piece 100 at this time is measured by the displacement meter 2 according to the present invention.

  Next, the configuration of the displacement meter 2 according to the present invention will be described. FIG. 2 is a schematic diagram of the displacement meter 2 according to the present invention. Also in FIG. 2, illustration of a marking setting bar 25, a support block 31, and the like, which will be described later, is omitted.

  The displacement meter 2 according to the present invention is disposed so as to be movable up and down with respect to the shaft 10 by the action of the shaft 10 and the bearing 20 disposed in the vertical direction and rotatable about the shaft 10. And an upper arm 21 and a lower arm 22 that can be moved up and down with respect to the shaft 10 by the action of the bearing 30 and that is pivotable about the shaft 10. On the lower surface of the upper arm 21, a holding part 23 having a pair of contacts 51 and 52 described later for holding the upper marked portion of the test piece 100 is attached. Further, on the upper surface of the lower arm 22, a clamping part 24 having a pair of contacts 53 and 54 described later for clamping a lower marked line portion of the test piece 100 is attached.

  Here, the marked line in the test piece 100 may be formed or written on the test piece 100 itself, or may be written on a marked line sticker attached to the surface of the test piece 100. Further, the marked line may be virtual.

  A wire 41 is connected to the screw 33 disposed at the rear end of the upper arm 21. A weight 39 is connected to the end of the wire 41 opposite to the screw 33, and the wire 41 is wound around a pulley 35. The total weight of the bearing 20, the upper arm 21 and various components connected thereto and the weight of the weight 39 are balanced, and the upper arm 21 can be raised and lowered with a small force. The amount of rotation of the pulley 35 is measured by a rotary encoder 37 disposed coaxially with the pulley 35, and the lifting distance of the upper arm 21 is calculated from the amount of rotation of the pulley 35, the diameter, and the like.

  Similarly, a wire 42 is connected to the screw 34 disposed at the rear end of the lower arm 22. A weight 40 is connected to the end of the wire 42 opposite to the screw 34, and the wire 42 is wound around a pulley 36. The total weight of the bearing 30, the lower arm 22 and various components connected thereto and the weight of the weight 40 are balanced, and the lower arm 22 can be raised and lowered with a small force. The amount of rotation of the pulley 36 is measured by a rotary encoder 38 disposed coaxially with the pulley 36, and the lifting distance of the lower arm 22 is calculated from the amount of rotation of the pulley 36, the diameter, and the like.

  3 and 4 are perspective views showing a main part of the displacement meter 2 according to the present invention. FIG. 5 is a partial perspective view of the lower arm 22 as viewed obliquely from below, and FIG. 6 is a perspective view showing a state in which the lower arm 22 is supported by the support block 31. FIG. 7 is a perspective view of the support block 31 as viewed obliquely from above. 3 shows a state in which the upper arm 21 and the lower arm 22 are spaced apart from each other, and FIG. 4 shows that the upper arm 21 and the lower arm 22 are connected to each other by a benchmark setting bar 25 or the like. It shows the state that was done.

  As described above, the upper arm 21 can be moved up and down with respect to the shaft 10 by the action of the bearing 20 and can be rotated about the shaft 10. On the lower surface of the upper arm 21, a holding portion 23 having a pair of contacts 51 and 52 for holding the upper marked portion of the test piece 100 is attached. These contactors 51 and 52 are moved in directions close to each other in order to sandwich the upper marked portion of the test piece 100 by the action of an actuator (not shown), and to release the test piece 100 from the sandwiched state. Move away from each other.

  On the lower surface of the upper arm 21, a marked line setting bar 25 is disposed facing downward. The marked line setting bar 25 indicates the distance between the holding position of the test piece 100 by the contacts 51 and 52 of the upper arm 21 and the holding position of the test piece 100 by the contacts 53 and 54 of the upper arm 22 in the test piece 100. It is used for the purpose of matching the distance between the marked lines (GL / Gauge Length). As shown in FIG. 3, a projecting portion 26 that functions as a first engaging portion according to the present invention is attached to the lower end portion of the marked line setting bar 25.

  As described above, the lower arm 22 can be moved up and down with respect to the shaft 10 by the action of the bearing 30 and can be rotated around the shaft 10. On the upper surface of the lower arm 22, a holding part 24 having a pair of contacts 53 and 54 for holding the lower marked line part of the test piece 100 is attached. These contacts 53 and 54 are moved in the direction close to each other in order to sandwich the upper marked portion of the test piece 100 by the action of an actuator (not shown), and also to release the test piece 100 from the sandwiched state. Move away from each other.

  As shown in FIGS. 3 and 6, the lower arm 22 is formed with a hole 27 that engages with a protrusion 26 attached to the mark setting bar 25. The hole portion 27 functions as a second engagement portion according to the present invention. Further, as shown in FIG. 5, on the lower surface of the lower arm 22, there is a projecting portion 28 that comes into contact with a projecting portion 29 disposed on the upper surface of a support block 31 described later as the lower arm 22 rotates. It is arranged.

  The support block 31 is for restricting the raising and lowering positions of the upper arm 21 and the lower arm 22 by supporting the lower arm 22 from below. The support block 31 has a configuration capable of moving up and down with respect to the shaft 10. And the raising / lowering of the support block 31 is controlled by the screw member 32 provided with the handle | steering_wheel as shown in FIG.3, FIG4 and FIG.6. As shown in FIG. 7, on the upper surface of the support block 31, a protrusion 29 that contacts the protrusion 28 disposed on the lower surface of the lower arm 22 is disposed.

  In the displacement meter 2 having such a configuration, the ascending / descending position of the lower arm 22 is regulated by the protrusion 28 disposed on the lower surface of the lower arm 22 coming into contact with the upper surface of the support block 31. Then, when the lower arm 22 rotates around the shaft 10, the protrusion 28 disposed on the lower surface of the lower arm 22 and the protrusion 29 disposed on the upper surface of the support block 31 come into contact with each other. The rotational angle position of the lower arm 22 is restricted.

  On the other hand, the upper arm 21 is connected to the lower arm 22 via a marked line setting bar 25. That is, in the state where the upper arm 21 is lowered from the height position shown in FIG. 3 to the height position shown in FIG. 4, the protrusion 26 attached to the lower end portion of the mark setting bar 25 is formed on the lower arm 22. Thus, the upper arm 21 and the lower arm 22 are connected to each other. For this reason, the raising / lowering position with respect to the lower arm 22 of the upper arm 21 is regulated by the marked line setting bar 25. Further, the rotation angle position of the upper arm 21 becomes the same angle position as the rotation angle position of the lower arm 22 by the action of the mark setting bar 25.

  When a material test is performed on the test piece 100 by the material testing machine 1, first, both ends of the test piece 100 are gripped by the upper chuck 16 and the lower chuck 17 of the material testing machine 1. At this time, it is assumed that the marking setting bar 25 corresponding to the test piece 100 for performing the material test is disposed on the upper arm 21. In addition, it is assumed that the contacts 51 and 52 in the upper arm 21 and the contacts 53 and 54 in the lower arm 22 have been moved in a direction away from each other in advance.

  In this state, the operator holds either the upper arm 21 or the lower arm 22 and is suitable for holding the test piece 100 between the contacts 51 and 52 in the upper arm 21 and the contacts 53 and 54 in the lower arm 22. Move it to the desired position. At this time, the upper arm 21 and the lower arm 22 rotate in synchronization with each other because the upper arm 21 and the lower arm 22 are connected to each other by the marked line setting rod 25 or the like. The distance between the contacts 51 and 52 in the upper arm 21 and the contacts 53 and 54 in the lower arm 22 is the distance between the marked lines in the test piece 100 in advance by the action of the marked line setting bar 25. Thus, by adjusting the height position of the support block 31, the contacts 51, 52 in the upper arm 21 and the contacts 53, 54 in the lower arm 22 are easily arranged at a height position for holding the test piece 100. can do. At this time, the protrusions 28 disposed on the lower surface of the lower arm 22 and the protrusions 29 disposed on the upper surface of the support block 31 come into contact with each other, so that the contacts 51 and 52 on the upper arm 21 The contacts 53 and 54 in the arm 22 can be easily arranged at a rotation angle position for holding the test piece 100. Therefore, the upper and lower marked portions of the test piece 100 can be easily held between the contacts 51 and 52 in the upper arm 21 and the contacts 53 and 54 in the lower arm 22.

  If the test piece 100 is sandwiched between the contacts 51 and 52 in the upper arm 21 and the contacts 53 and 54 in the lower arm 22, the material test is started by the material testing machine 1. At this time, when the upper chuck 16 holding the upper end of the test piece 100 starts to rise, the test piece 100 is stretched, and accordingly, the upper arm 21 and the lower arm 22 move upward. The movement amount is measured by the rotary encoders 37 and 38 shown in FIG. 2, and the difference between the movement amount of the upper arm 21 and the movement amount of the lower arm 22 is measured as the extension amount of the test piece 100. Then, various material test calculations are performed based on the elongation amount of the test piece 100 obtained in this way and the load value measured by the load cell 15 shown in FIG.

  In the above-described embodiment, the upper arm 21 and the lower arm 22 are connected by engaging the protrusion 26 of the mark setting bar 25 and the hole 27 of the lower arm 22. The arm 21 and the lower arm 22 may be connected to each other using a dedicated connecting member. Moreover, you may employ | adopt structures other than the structure which engages the upper arm 21 and the lower arm 22 with a certain connection member like embodiment mentioned above. The “connection” described in this specification refers to other configurations in which the upper arm 21 and the lower arm 22 are moved in synchronization with each other by bringing the upper arm 21 and the lower arm 22 into contact with each other via some member. It is a concept that also includes

  Further, in the above-described embodiment, a configuration is employed in which the protruding portion 26 of the mark setting bar 25 and the hole 27 of the lower arm 22 are engaged, but the hole is formed on the lower surface of the mark setting bar 25. It is also possible to adopt other configurations as the engaging portion, such as by forming a protruding portion on the upper surface of the lower arm 22 while forming it.

  In the above-described embodiment, the case where both the upper arm 21 and the lower arm 22 are raised by raising the cross head 14 has been described. However, even when both the upper arm 21 and the lower arm 22 are lowered, The displacement meter according to the present invention can be applied.

  Further, in the above-described embodiment, after both ends of the test piece 100 are gripped by the upper chuck 16 and the lower chuck 17 of the material testing machine 1, the upper and lower marked portions of the test piece 100 are moved to the contacts 51 of the upper arm 21. 52 and the contacts 53 and 54 of the lower arm 22. The upper and lower marked portions of the test piece 100 are held by the contacts 51 and 52 of the upper arm 21 and the contacts 53 and 54 of the lower arm 22. After clamping, the upper arm 21 and the lower arm 22 may be moved synchronously, and thereafter, both ends of the test piece 100 may be gripped by the upper chuck 16 and the lower chuck 17 of the material testing machine 1.

DESCRIPTION OF SYMBOLS 1 Material testing machine 2 Displacement meter 10 Shaft 11 Base 12 Support | pillar 13 Cross yoke 14 Cross head 15 Load cell 16 Upper chuck 17 Lower chuck 20 Bearing 21 Upper arm 22 Lower arm 23 Clamping part 24 Clamping part 25 Marking line setting rod 26 Protrusion part 27 Hole part 28 Protrusion part 29 Protrusion part 30 Bearing 31 Support block 32 Screw member 35 Pulley 36 Pulley 37 Rotary encoder 38 Rotary encoder 39 Weight 40 Weight 41 Wire 42 Wire 51 Contactor 52 Contactor 53 Contactor 54 Contactor 100 Test piece

Claims (4)

A displacement meter for measuring the elongation of a test piece,
A shaft arranged in a vertical direction;
An upper arm provided with a pair of contacts for sandwiching the upper marked portion of the test piece, being movable up and down with respect to the shaft, and being pivotable about the shaft;
A lower arm provided with a pair of contacts for sandwiching the lower marked portion of the test piece, which can be moved up and down with respect to the shaft, and pivotable about the shaft;
A connecting member for connecting the upper arm and the lower arm to match the rotational angle positions of the upper arm and the lower arm around the shaft;
Displacement meter characterized by comprising. The displacement meter according to claim 1,
The connecting member is
A first engagement portion formed at the tip of a marking setting bar attached to one of the upper arm or the lower arm;
A second engagement portion formed on the other of the upper arm or the lower arm and engaged with the first engagement portion;
Displacement meter. The displacement meter according to claim 1 or 2,
A displacement meter comprising an angular position regulating member for regulating a rotational angular position about the shaft of at least one of the upper arm or the lower arm. In the displacement meter according to any one of claims 1 to 3,
A displacement meter comprising a lift position restricting member for restricting a lift position of at least one of the upper arm and the lower arm with respect to the shaft.

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