JP3825145B2 - Specimen gripper for viscoelasticity measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is used for the purpose of determining the physical properties of viscoelastic bodies such as vulcanized rubber, such as storage elastic modulus, loss elastic modulus, loss coefficient, etc. It relates to the device.
[0002]
[Prior art]
Taking automobile tires as an example, in recent years, in addition to the durability of tires such as wear, fatigue and destruction, a wide variety of performances such as maneuverability, stability, vibration riding comfort, and low fuel consumption are required. In order to realize such performance as expected, it is necessary to measure various physical properties related to various performances of rubber materials with a wide range of high precision, and the material quality is more detailed. It is necessary to manage.
[0003]
In addition, regarding the measurement of physical properties, it is necessary to perform more measurements in a short time under the diversification of performance requirements for tires. In order to make it possible, there is a strong demand for automation of physical property measurement and labor saving.
[0004]
By the way, in the conventional device for measuring viscoelasticity that is the basis of various physical properties of vulcanized rubber, the viscoelasticity is measured with high accuracy sufficient to predict and evaluate the tire performance at the material stage. In addition, it is impossible to automate the measurement work and save labor.
[0005]
This means that in conventional spectrometers and other viscoelasticity measuring devices, especially dynamic viscoelasticity measuring devices, strip-shaped elastic specimens made of vulcanized rubber, generally 4 mm wide, 2 mm thick, long For example, both ends of a 40 mm test piece are gripped by chuck means, and, for example, a sinusoidal strain due to tension is applied to one end of the elastic test piece. Measure the phase difference, etc., and determine the dynamic storage elastic modulus (E '), dynamic loss elastic modulus (E "), loss coefficient (tan δ), complex elastic modulus (E ^* ), etc. (see JIS K7198) In this case, it is inevitable that the elastic body test piece is screwed and fixed to each chuck means illustrated in FIG. 7 using a spanner, a wrench or the like based on the manual work of the operator. Specimen for The size of the test piece is smaller than that of the test piece used for other types of tests, and the gripping of the test piece is caused by the necessity of measuring minute displacement and load of several tens of μm and several gf. The artificial non-uniformity that accompanies the measurement will have a major impact on the measurement accuracy and the reproducibility of the measurement accuracy. For example, even if you want to know the slight variation in physical properties of many similar samples, the variation However, there is a problem in measurement accuracy that it is included in the measurement error range of the dynamic viscoelasticity measuring apparatus.
[0006]
[Problems to be solved by the invention]
On the other hand, in order for the dynamic viscoelasticity measuring device to fully exhibit the measurement accuracy inherently possessed by the dynamic viscoelasticity measuring device, the posture where the central axis of the elastic body test piece is inclined with respect to the acting direction of the tensile external force. It is necessary to prevent the chuck from being gripped by the chuck means and to avoid the component force in the direction perpendicular to the direction of the tensile force acting on the test piece. It is necessary to prevent the deformation and tensile deformation of the test piece caused by gripping the end part of the test piece one side at a time by the chuck means. It is necessary to fix the screw with sufficient force to prevent stress concentration on the test piece caused by the tightening force being too strong, and to prevent the test piece from coming out due to being too weak. So for the above purpose Is hitting the formation, addition to pay close attention to the mounting of the elastic member specimen inevitable, there is a problem that working steps for the attachment is a considerable increase.
[0007]
This invention was made as a result of studying as a subject to solve such problems of the prior art, and the object of the invention is to grasp the elastic test piece by the chuck means and By sufficiently removing the artificial factors that cause the person's manual work, each elastic body test piece is always in the same and proper posture, and by holding it with a certain force as expected, It is an object of the present invention to provide a specimen gripping device for a viscoelasticity measuring device that can sufficiently improve each of measurement accuracy and reproducibility of measurement accuracy.
It should be noted that each of these devices and methods can sometimes be for a tensile test device, a tear test device, and the like.
[0008]
[Means for Solving the Problems]
A test piece gripping device for a viscoelasticity measuring device according to the present invention comprises a pair of chuck means for gripping each end portion of an elastic test piece. Each chuck means is connected to a fixed jaw and the fixed jaw. A plurality of movable jaws that are rotatable with respect to each other, spring means that urges the movable jaws in the closing direction, and a movable jaw that presses the elastic body test piece against the fixed jaws, and a plurality of cone-shaped tips. And an externally driven swing arm that contacts the foot portion provided on the movable jaw of each chuck means and displaces the movable jaw in the opening direction. Is.
[0009]
In this gripping device, each end portion of the elastic body test piece is maintained in the required posture of the elastic body test piece while the movable jaw of each chuck means is opened by the swing arm. The movable jaws are carried into the desired positions between the fixed jaw and the movable jaw, and then each movable jaw is closed with a predetermined force by a spring means, whereby the movable jaw and the removal provided on the movable jaw are removed. Each elastic test piece is gripped at the same position of the chuck means by properly pressing each end portion of the test piece against the fixed jaw with the stop projection, and the center axis of the test piece is held on both chucks. can be easily aligned with the center axis of the unit, also, the elastic body test piece, by keeping an upright posture at the finger, it at each of the movable jaw to perform rotational motion It is possible to effectively prevent the occurrence of bending deformation and tensile deformation of the elastic specimen when gripping, and furthermore, by closing and displacing the movable jaw with spring means having a required spring force. Therefore, it is possible to sufficiently hold the elastic body test piece with the same force and properly, and sufficiently prevent the tightening force of the test piece from being excessively large or small. In addition to eliminating the need to crush the specimen for gripping the specimen, the efficiency of the gripping work is greatly improved. In addition, the accuracy of viscoelasticity measurement and the reproducibility of the accuracy are sufficient. Will be enhanced.
[0010]
By the way, in the above test piece gripping device, more preferably, a manual operation lever is projected from each movable jaw so that the movable jaw can be opened and closed as required based on the operation of the lever.
[0011]
Here, the test piece is fed to the test piece gripping device for the viscoelasticity measuring device by taking out a plurality of aligned elastic test pieces one by one and transferring the elastic test pieces to a predetermined delivery. This is done by pushing the displacement to the position, then clamping the elastic test piece that has reached the delivery position and carrying it between the movable jaw and the fixed jaw in the open posture of each pair of chuck means it can.
[0012]
In a more preferred case, the moving of the elastic body test piece and be conducted in its upright position, and preferably, a resilient test piece for moving at translational movement only.
[0013]
According to such a feeding method, each of the elastic test pieces is clamped, for example, mechanically or automatically, and each of the fixed jaw and the movable jaw of the chuck means paired. By reliably carrying it in to the expected position between the test pieces, the gripping of the test piece by the chuck means can be made sufficiently appropriate, and the measurement accuracy and the reproducibility of the measurement accuracy can be effectively enhanced.
[0014]
And this is because when the elastic body test piece is moved into an upright position until it is carried into the chuck means, the possibility of the occurrence of bending deformation due to the action of its own weight is removed from the test piece. It is effective.
[0015]
Here, when the elastic body test piece is moved only by translational movement, the structure of the mechanism part can be simplified, and the positioning stop of the test piece can be made simple and easy.
[0016]
Further, the test strip feeding device provided in the test strip gripping device for the viscoelasticity measuring device of the present invention comprises a stocker for holding a plurality of elastic test pieces in an upright posture, and a sample taking out the elastic test strips from the stocker. Means, a pusher that pushes and displaces each of the elastic test pieces taken out from the stocker to a predetermined delivery position, and clamps the elastic test piece that has reached the delivery position at the center in the longitudinal direction thereof In addition, both ends of the elastic body test piece are provided with fingers for conveying each chuck means paired up and down to a position where the chuck jaws are placed between the movable jaw and the fixed jaw in the open posture. is there.
[0017]
More preferably, in this specimen feeding device, the elastic specimen is allowed to pass through the finger clamped with the elastic specimen to the position corresponding to the pair of chuck means, while the finger is displaced back. Are provided with stoppers for restraining the fingers in a posture reaching a predetermined position between the movable jaw and the fixed jaw of each chuck means.
[0018]
In such a test piece feeding apparatus, each elastic test piece is accurately extruded to a predetermined delivery position with respect to the finger in cooperation with a sample take-out means for taking out the elastic test piece from the stocker and a pusher. A chuck means that clamps the center part in the length direction of the elastic body test piece with a finger and makes the upper and lower end parts form a pair based on the displacement of the finger. of, to between the movable jaw and the fixed jaw in the open position, accurately conveyed to the position where the enter position of as expected was, thereafter, the previously mentioned, the test piece gripping device, among others, the By operating the movable jaw of the chuck means, the elastic body test piece can be automatically and always properly held.
[0019]
Further, in this feeding device, after the finger after clamping the elastic body test piece is temporarily passed to the position corresponding to the chuck means, the stopper and the elastic body test piece are held by the stopper during the return displacement process of the finger. When positioning, it is possible to sufficiently accurately position the upper and lower end portions of the test piece between the movable jaw and the fixed jaw, as well as to perform a predetermined test on the test piece held by the chuck means. After the completion, when the test piece is again clamped on the finger and taken out, the finger can be positioned again with the stopper.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of the specimen gripping device of the present invention.
Here, a pair of chuck means 1 for gripping each end portion of the elastic body test piece S are arranged in alignment on a virtual vertical axis VL, and each chuck means 1 is attached to the elastic body test piece S. On the other hand, a fixed jaw 2 is provided on the same side, and a movable jaw 3 positioned on the opposite side of the test piece S from the fixed jaw 2 is rotated with respect to the test piece S and eventually the fixed jaw 2. Provide as possible.
[0021]
Each chuck means 1 is provided with a spring means, for example, a leaf spring 4, for urging the movable jaw 3 in the closing direction thereof. As shown in the figure, one end of a flat plate spring 4 is screwed and fixed to the chuck means main body, and the movable jaw 3 is biased in the closing direction with the other end of the plate spring 4. However, instead of the leaf spring 4, a compression spring or a tension spring having a coil shape, a whisker shape, or the like may be used.
[0022]
Furthermore, a plurality of retaining protrusions 5 for pressing the elastic body test piece S against the fixed jaw 2 are provided on the movable jaw 3 of each chuck means 1. Here, as shown in FIG. 2, for example, as shown in FIG. 2, the arrangement of the retaining protrusions 5 whose tip portions can be made substantially conical is the arrangement of the protrusions 5 positioned close to each other. This can be done by increasing the number, and the number of protrusions on the proximity side can be increased as appropriate in relation to the width of the elastic specimen S. On the other hand, the number of protrusions positioned apart from each other may be only one regardless of the width of the test piece S. However, if each retaining projection 5 mutual proximity side and away septum side of the two movable jaw 3 were both one by one, regardless of the wide or narrow the width of the test piece S, of tensile force to it In the operation, even if a tensile force is applied to the central portion in the width direction of the test piece S, a force in the direction of reducing the width is applied to the other portions, so that it is difficult to obtain high measurement accuracy.
Here, the fixed jaw 2 can also be provided with a plurality of uneven strips for preventing slipping.
[0023]
In order to mechanically displace the movable jaw 3 of each chuck means 1 configured as described above without depending on the operator, here, the movable jaw 3 is moved to the chuck means under its closed position. A foot portion 3a penetrating the main body portion and projecting greatly toward the fixed jaw side is provided, and a swing arm 6 having a bell crank shape in the figure is provided to rotate and displace the foot portion 3a. A cylinder 7 for controlling the operation is provided.
[0024]
According to this, the cylinder 7 hinged to one end of the swing arm 6 is extended, and based on this, the other end of the swing arm 6 is swung around the fulcrum 6a to move the movable jaw 3. The movable jaw 3 is automatically opened by contacting the foot 3a and rotating the foot 3a in the direction in which the foot 3a approaches the elastic specimen S.
FIG. 3 shows a state in which each movable jaw 3 is simultaneously opened under such an action of each pair of swing arms 6.
[0025]
Further, in this gripping device, each movable jaw 3 is provided with a manual operation lever 3b protruding to the side opposite to the foot portion 3a. By manually operating this lever 3b, the movable jaw 3 is moved to the swing arm. Independent of the operation of 6, it is possible to displace open.
[0026]
According to the test piece gripping device as described above, the foot 3a or the manual operation lever 3b of each chuck means 1 is actuated, and the movable jaw 3 is maintained in the open posture as shown in FIG. The body test piece S is moved in a direction orthogonal to the paper surface of FIG. 3, and upper and lower end portions thereof are positioned at predetermined positions between both jaws, and then each movable jaw 3 is moved to a leaf spring. By closing with an appropriate force under the action of 4, the elastic body test piece S is always subjected to the posture and gripping force as expected under the indentation deformation by the protrusion 5, without causing bending thereof. It can be easily and easily grasped in a short time.
[0027]
4A and 4B are a plan view and a front view, respectively, showing an embodiment of the test strip feeding device to the test strip gripping device as described above, which is disposed at a predetermined position.
In the figure, reference numeral 11 denotes a stocker of the elastic body test piece S. The stocker 11 has, for example, a plurality of elastic body test pieces S having a width of about 4 mm, a thickness of 2 mm, and a length of about 35 to 40 mm in an upright posture. It works to keep it aligned.
[0028]
On one side of such a stocker 11, sample take-out means for taking out the test piece S therefrom, in the figure, the rod is pushed and urged with a predetermined force, so that the elastic test piece S is made thick. Pusher 12 that pushes in the direction, and on the other side of the stocker 11, a pusher that accurately pushes and displaces each of the test pieces S pushed out of the stocker 11 by the pusher 12 to a predetermined delivery position. 13 is provided.
[0029]
Here, the pushing displacement of each elastic body test piece S under the cooperation of the pushing means 12 and the pusher 13 is caused by the action portion of the pusher 13 as shown in a partially enlarged plan view in FIG. A notch 13a having a flat width corresponding to the thickness of the test piece S is formed at a certain tip portion on the side adjacent to the stocker 11, and the pusher is pressed under the normal pressing action of the extruding means 12 against the test piece S. When the notch 13a reaches a position corresponding to the test piece S aligned and held in the stocker, only one test piece S is received in the notch 13a, and then the pusher 13 Can be realized by advancing displacement together with one test piece S with the cylinder 14 connected thereto, and the front surface in the thickness direction of the elastic test piece S is formed by the notch 13a. Depending on the wall Further, the back surface in the thickness direction by the stocker sidewalls and bottom surface of the specimen S is to be-regulating respectively the base plate 15.
[0030]
And, the same thing as this is that, for example, a plate that is spring-biased toward the side wall of the stocker 11 is arranged at a portion of the pusher 13 corresponding to the position where the notch 13a is formed. This is also done by taking each of the test pieces S to the pusher side based on the elastic test piece S being moved backward by an amount corresponding to the thickness of the elastic test piece S. Can do.
[0031]
By the way, since the forward / backward stroke of the pusher 13 is accurately controlled by the cylinder 14 connected thereto, each test piece S delivered from the stocker 11 to the pusher 13 as described above is advanced by the pusher 13. By the stroke, the base plate 15 is accurately displaced by extrusion to a predetermined delivery position A.
[0032]
Further, here, the elastic body test piece S taken out to the delivery position A is clamped at the central portion in the length direction thereof, and the test piece S is conveyed to the respective chuck means 1 paired up and down. Fingers 16 are provided. As shown in plan views in FIGS. 4A and 5, the finger 16 is a pair of pawl members 16 a that can be opened and closed with respect to each other across the test piece S at the position A, and in this case has a substantially crank shape. The opening / closing operation of the finger 16 can be performed by the opening / closing operation of a biaxial parallel opening / closing type air cylinder 17 connected thereto. Further, the test piece conveying operation of the finger 16 to the chuck means 1 can be performed by driving the attachment base 18 of the finger 16 forward and backward by, for example, a rodless cylinder 19.
[0033]
Therefore, the clamp of the test piece S by the finger 16 is performed by, for example, moving the finger 16 opened to the delivery position A to the delivery position A with respect to the test piece S which has been pushed and displaced to the predetermined delivery position A by the pusher 13. Then, the fingers 16 are closed by the two-axis parallel open / close air cylinder 17 or, conversely, between the fingers 16 that have been kept waiting in an open posture at a predetermined delivery position A. After the test piece S is pushed and displaced by the pusher 13, the finger 16 can be closed and the elastic test piece S clamped to the finger 16 in this way can be paired. The conveyance to the chuck means 1 is performed by the finger 16 and the elastic body based on the operation of the rodless cylinder 19. As shown in FIG. 3, as shown in FIG. 3, the upper and lower end portions of the test piece S are moved back and forth, and the fixed jaw 2 and the movable jaw 3 of the respective chuck means 1 with the movable jaw 3 opened. It can be carried out by interposing between them and positioning them at a predetermined position between them.
[0034]
Here, each end portion of the test piece S is positioned between the jaws 2 and 3 when the finger 16 and the elastic body test piece S are moved backward, for example, the mounting base 18 and other rear end surfaces are applied to the stopper. Needless to say, it can be performed by contact, but more preferably, the finger 16 clamped with the test piece S is once retracted under the open posture of each movable jaw 3 of the pair of chuck means 1. As shown in the enlarged plan view of the main part in FIG. 6, the stopper 20 is inserted into the advance path of the mounting base 18, for example, in a rotary manner. Projecting on the basis of the rotational movement of the air cylinder 21, and bringing the front end surface of the mounting base 18 into contact with the stopper 20 Finger 16, thus, the positioning of the specimen S.
[0035]
That is, according to this latter, during the required test for the elastic body test piece S gripped by the chuck means 1, the finger 16 is put on standby at its retreat limit position B and the test is finished. When removing S from the chuck means 1 by the action of the finger 16, there is an advantage that the advance position of the finger 16 can be accurately positioned at a position corresponding to the elastic specimen S by the stopper 20.
[0036]
By the way, after the upper and lower end portions of the elastic body test piece S are accurately positioned between the movable jaw 3 and the fixed jaw 2 as described above, the respective swing arms 6 are rotated with the cylinders 7. By moving the displacement and releasing the restraint on the foot portion 3a of each movable jaw 3, the movable jaws 3 are simultaneously closed based on the spring force of the leaf spring 4 to fix the test piece S. Insert it properly as intended for jaw 2.
[0037]
Here, the gripping posture of the test piece S by each chuck means 1 is related to the advance position of the pusher 13, the test piece clamp position of the finger 16, and the position of the stopper 20. By adjusting the delivery position, etc., it is possible to always achieve the expected one with excellent reproducibility.
[0038]
When the test piece S is in the proper sandwiched state as described above, each retaining protrusion 5 provided on the movable jaw 3 has a substantially conical shape at the distal end portion, but the curved portion at each distal end. Since the test piece S is securely and securely held without causing any scratches, the test piece S does not come off or slip, and an extreme stress concentration occurs in the protrusion pushing portion of the test piece S. It does not occur.
[0039]
In this way, after the one elastic body test piece S taken out from the stocker 11 is properly gripped by the pair of chuck means 1, the test piece preferably based on the action of the chuck means 1 is preferably used. Until the end of the test for S, the finger 16 is retracted to its retreat limit position B and waited. And after completion | finish of a test, the finger 16 advances and displaces to the action position of the stopper 20 under the open | release of it, and while performing the clamping of the test piece S by the finger 16 again, each chuck means 1 is made. The movable jaw 3 is opened and the tested specimen S is delivered from the chuck means 1 to the finger 16.
[0040]
On the other hand, the finger 16 is located between the delivery position of the test piece S and the retreat limit position B, or the retreat limit position B, and the delivery position A of the next test piece S with the stopper 20 opened. In any displacement during, the finger 16 is opened at a predetermined position, and the tested specimen S clamped there is discarded.
[0041]
After completing the test for one test piece S as described above, the same operation as described above is repeated for the other test pieces S taken out from the stocker-11.
[0042]
【The invention's effect】
Thus, in the test piece gripping device of the present invention, the elastic body test piece is carried into a predetermined position between the fixed jaw and the movable jaw of the pair of chuck means while maintaining the required posture. The gripping posture of the test piece by the chuck means can be made simple and easy at all times, and the occurrence of bending deformation or tensile deformation to the elastic body test piece makes the test piece upright. Can be sufficiently prevented by feeding to the center position of the upper and lower movable jaws and simultaneously closing both movable jaws there.
[0043]
Further, by closing the movable jaw under the action of a spring means having a required spring force, the elastic specimen can be always held with an appropriate force in combination with the action of the retaining protrusion. .
[0044]
Further, according to the above-described test piece feeding method to the test piece gripping device of the present invention, each of the test pieces is mechanically clamped by the clamp means, and the fixed jaw and the movable jaw of the chuck means that make a pair. By reliably carrying in to the expected position between the two, the gripping of the test piece by the chuck means can always be properly performed, the measurement accuracy can be improved, and the reproducibility of the measurement accuracy can be improved.
[0045]
In addition, according to the test strip feeding device provided in the test strip gripping device of the present invention, the above feeding method can be reliably realized under a simple device structure, and a series of steps can be performed. Can be easily fully automated.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a specimen gripping device.
FIG. 2 is a view showing an arrangement form of retaining protrusions.
FIG. 3 is a view similar to FIG. 1 showing the open state of the movable jaw.
FIGS. 4A and 4B are a plan view and a front view showing an embodiment of a test piece feeding apparatus. FIGS.
5 is an enlarged plan view of a main part of the apparatus shown in FIG.
FIG. 6 is an enlarged plan view of a main part showing a related portion of the stopper.
FIG. 7 is a perspective view showing a conventional chuck means.
[Explanation of symbols]
S elastic body test piece 1 chuck means 2 fixed jaw 3 movable jaw 3a foot 3b manual operation lever 4 leaf spring 5 retaining projection 6 swing arm 6a fulcrum 7, 14 cylinder 11 stocker 12 pusher 13 pusher 13a notch 15 base plate 16 Finger 16a Claw member 17 Biaxial parallel open / close air cylinder 18 Mounting base 19 Rodless cylinder 20 Stopper 21 Rotary air cylinder VL Virtual vertical axis

Claims (4)

In a test piece gripping device for a viscoelasticity measuring device comprising a pair of chuck means for gripping respective end portions of an elastic body test piece,
Each chuck means is provided with a fixed jaw, a movable jaw rotatable with respect to the fixed jaw, a spring means for urging the movable jaw in the closing direction, and the movable jaw, and the elastic test piece is fixed to the fixed jaw. External drive, which consists of a plurality of retaining protrusions whose tip portions are conical and pressed against each other, and abuts against the foot provided on the movable jaw of each chuck means to displace the movable jaw in the opening direction A test piece gripping device for a viscoelasticity measuring device, characterized in that a swing arm is provided.   2. A test piece gripping device for a viscoelasticity measuring device according to claim 1, wherein a manual operation lever is provided on each movable jaw. A stocker that holds multiple elastic specimens in an upright position, a sample take-out means for taking out the elastic specimens from the stocker, and an elastic displacement of each of the elastic specimens taken out from the stocker to a predetermined delivery position Clamp the elastic test piece that has reached the delivery position and the elastic body test piece at the center in the length direction of the pusher, and open the posture of each chuck means in which both ends of the elastic test piece are paired up and down test piece for viscoelasticity measuring apparatus according to enter the trial Kenhen delivery device Ru comprising a finger for transporting to a position where the posture to claim 1 or 2 formed by providing the between the movable jaw and the fixed jaw of Grab device . While allowing the finger clamped to the elastic specimen to pass to the position corresponding to the pair of chuck means, the elastic specimen is allowed to move to the movable jaw and the fixed jaw of each chuck means under the return displacement of the fingers. test piece gripping apparatus for viscoelasticity measurement apparatus according to claim 3 comprising providing a trial Kenhen delivery device Ru comprising a stopper for restraining the finger in position reaches a predetermined position between the.

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