JPH0421094Y2 - - Google Patents

Description

[Detailed explanation of the idea]

a. Industrial Application Field The present invention relates to an automatic torsion testing machine. b. Prior art As a torsion tester according to the prior art, one end of the test piece is fixed using a chuck provided at the lower end, and one end of a torsion wire is fixed using a wire fixing means provided at the upper end to connect the two. a coupling member, a test piece fixing member for fixing the other end of the test piece using a chuck provided at the upper end, a twisting means for manually rotating the other end of the torsion wire by a predetermined angle, and rotation of the coupling member. Equipped with a torsion angle detection means that measures the angle using an angle scale plate and a pointer,
There is a test machine that tests the torsion characteristics of a test piece from the rotation angle of the coupling member when the above-mentioned torsion means is rotated by a predetermined angle. c. Problems that the invention aims to solve In this type of device, rotation, angle reading, graph creation, calculation, etc. were all done manually, and a measurement operator was required from start to finish. In addition, in conventional torsion testing machines, the test piece mounting chuck is directly fixed to the device, so it is difficult to attach a test piece having dimensions of 2 mm x 3 mm x 38 mm to the chuck. Furthermore, there were individual differences in angle reading, resulting in low measurement accuracy. An object of the present invention is to provide an automatic torsion testing machine that can automatically and quickly and accurately measure the rigidity, specific modulus, etc. of a test piece and eliminates the above-mentioned drawbacks. d Means for solving the problem The above purpose is to provide a connecting member that has a removable test specimen mounting chuck at the lower end and connects one end of the test specimen to one end of the torsion wire, and a removable test specimen mounting chuck at the upper end. a test piece fixing member that has a chuck for fixing the other end of the test piece; a torsion actuator that rotates the other end of the torsion wire by a predetermined angle; and a torsion angle detection means that detects the rotation angle of the coupling member; a torsion actuator control means for controlling the torsion actuator; a data processing means for amplifying the output of the torsion angle detection means and calculating a torsion characteristic value based on the output; a sample holder to which a coupling member is rotatably fixed; a constant temperature bath having a heating means and a stirring device; a temperature control means for controlling the temperature in the constant temperature bath;
Equipped with a sample holder moving means for moving the sample holder and/or a constant temperature chamber moving means for moving the thermostatic chamber, and measuring the torsional characteristic value of the sample piece at a predetermined temperature with the sample holder placed in the thermostatic chamber. This was achieved using an automatic torsion testing machine featuring e Action: Attach both ends of the test piece to a pair of chucks facing each other at a predetermined distance (usually 38 mm), and then fix both chucks to the connecting member and the test piece fixing member to attach the test piece to the sample holder. do. Next, the sample holder with the test piece attached is placed in a constant temperature bath containing a refrigerant (e.g. alcohol) or a refrigerant and dry ice, and the test piece is directly immersed in the refrigerant.
The temperature of the sample is set to a predetermined temperature using a heating means and a temperature control means. One end of the torsion wire is rotated by a predetermined angle by a torsion actuator, and the rotation angle of the coupling member at this time is detected by a torsion angle detection means. A torsion characteristic is calculated based on the output of the torsion angle detection means using a data processing means. Repeat the same process by changing the sample temperature. f Example Fig. 1 is a conceptual diagram of a preferred embodiment of the automatic torsion testing machine according to the present invention, Fig. 2 is a perspective view of a sample piece and a chuck for fixing the sample piece, and Fig. 5 is a diagram showing A of Fig. 1.
-A cross-sectional view and a temperature control block diagram. The sample holder 1 includes a frame 2, a test piece fixing member 3 provided at the bottom of the frame, and the sample holder 1.
It includes a coupling member 4 provided at the top. Test piece 5
is fixed to the sample holder 1 by fixing both ends with chucks 6 and 7, and then fixing the chucks 6 and 7 to the test piece fixing member 3 and coupling member 4, as shown in FIG. . Both ends of a torsion wire 9 are fixed to the torsion actuator 8 and the coupling member 4, which are fixed to the frame 2 via members not shown. In this embodiment, the torsion actuator 8
A pneumatic rotary actuator (manufactured by KAMO SEIKO CO., LTD.), which is oscillated by air pressure, is used. Figure 3 is a plan sectional view of the pneumatic rotary actuator, and Figure 4 is A-A in Figure 3.
FIG. Pneumatic rotary actuator 8
A cylindrical rotor 8 is rotatable around a central axis 8c fixed to a central axis 8a via an arm 8b.
d, the circular protrusions 8f provided on the top and bottom surfaces of the actuator casing 8e, the belt 8g surrounding the cylindrical rotor 8d and the circular protrusions 8f, and the space between the casing 8e and the belt 8g to be airtight. The casing 8 is equipped with a partition member 8h that holds and divides the
Air is forced in from one of the air inlets 8i and 8j (for example, 8i) provided in the air inlet 8i and 8j provided at the
When air is exhausted from j), the central shaft 8a rotates (in this example, in the direction of arrow a). When the directions of air injection and exhaust are reversed, the rotational direction of the central shaft 8a is reversed. By using the stopper, the center shaft 8a can be accurately rotated by 180°. Note that it is also possible to use an electromagnetic actuator as the torsional actuator. Since the torsion wire 9 and the test piece 5 are connected by the connecting member 4 and the test piece 5 is fixed at the lower end, when the torsion wire 9 is twisted by rotation of the central axis 8a of the torsion actuator 8, the torsion characteristics of the torsion wire 9 change. The coupling member 4 is rotated by an angle determined by the torsional properties of the test piece 5. Note that since the connecting member has sufficient rigidity and is rotatable, the twisting of the connecting member itself is zero. This rotation angle is detected by the twist angle detection means 10. The torsion angle detection means 10 includes, for example, a potentiometer or a rotary encoder. In the embodiment shown in FIG.
Six sets of test piece fixing members, coupling members, torsion actuators, and torsion angle detection means are provided so that book test pieces can be tested. However, the number of sets is not limited to six, and the number can be increased or decreased as required, and the arrangement can also be arranged in two rows or circularly in addition to one horizontal row. A constant temperature bath 11 is provided at the bottom of the sample holder 1 . As shown in FIG. 5, the constant temperature bath 11 includes a heat insulating container 11a, heating means 11b, and stirring means 11c. A refrigerant (e.g., alcohol) or a refrigerant and a cold agent (e.g., dry ice) are placed in the thermostatic chamber 11.
and temperature measuring means 11e (e.g. thermocouple thermometer)
By measuring the temperature inside the constant temperature bath 11 and controlling the heating means 11b with the temperature control means 12, the inside of the constant temperature bath can be set to a predetermined temperature. Injection of refrigerant and dry ice into the thermostatic chamber are performed using the upper opening of the chamber. Further, the refrigerant is discharged using the drain provided at the top opening or bottom of the tank. In the embodiment shown in Figure 1, so that dry ice etc. can be easily placed in the thermostatic chamber,
A rail 11d for moving the thermostatic oven 11 in a direction perpendicular to the paper surface is provided at the bottom of the thermostatic oven 11. Note that it is also possible to configure the thermostatic chamber 11 to be moved sufficiently below the sample holder 1. After putting a refrigerant or a refrigerant and a cryogen into the thermostatic chamber 11, the thermostatic chamber 11 is moved directly below the sample holder 1. By moving the sample holder 1 along the guide 13 using an air cylinder, the test piece 5 together with the sample holder 1 is placed in the thermostatic bath 11 and immersed in the coolant. After the inside of the constant temperature bath 11 reaches thermal equilibrium at the set temperature, the torsion actuator 8 twists the torsion wire 9, and the torsion angle at that time is detected by the torsion angle detection means 10. Based on the output of the torsion angle detection means 10,
The torsional properties of the sample piece 5 are determined in the computer section 14. computer section 14
is a torsion angle calculation means 14a that generates a signal corresponding to the torsion angle of the twisted wire 9 from the rotation angle of the coupling member 4 detected by the torsion angle detection means 10;
Then, it performs signal processing such as calculating the ratio modulus R based on a predetermined calculation formula from the torsion angle, sends the result of the signal processing to an output device, and generates a temperature setting signal that changes the set temperature of the temperature regulator. A control unit 14b and an output device 1 that outputs the result of the signal processing to a plotter, printer, CRT, etc.
4d, and a temperature regulator interface 14e for sending the temperature setting signal to the temperature regulator. When a plurality of sample holders are attached, the torsion angle calculation means is preferably provided for each sample holder, and the plurality of torsion angle calculation means are coupled to the control section 14b using a multiplexer or the like. is preferred. The temperature regulator interface 14e may be a digital pulse motor (DPM), and the temperature can be set using the rotation angle of the digital pulse motor (DPM) using a commonly used technique. The heating means 11b is connected to the control unit 14 via the temperature control means 12 and the temperature regulator interface 14e.
connected to b. Further, the output of the temperature measurement means 11c is sent from the temperature control means 12 to the control section 14b. Using the above device, the twist angle is measured, for example, as follows. In the state shown in FIG. 1, the sample piece 5 is attached to the test piece fixing member 3 and the coupling member 4 via the chucks 6 and 7. After putting a refrigerant (alcohol) at about 23° C. into the constant temperature bath 11, the constant temperature bath is moved horizontally using an air cylinder, and the sample holder 1 is moved vertically to immerse the sample piece in the coolant. In this state, instructions are given from the computer 14, and the torsion actuator 8 rotates the torsion wire 9 by 180° one sample at a time. The twist angle of the sample also differs depending on the sample's torsion characteristics. The torsion angle at this time is determined by the torsion angle detection means 1.
0 and stored in computer section 14. In this way, the torsion angle of each sample at room temperature (23°C) is determined. After that, the sample holder 1 is raised and the thermostatic chamber 11 is placed.
horizontally and put dry ice into the refrigerant. The constant temperature bath 11 and sample holder 1 are moved again to immerse the sample piece in the refrigerant and dry ice. At this time, the sample piece 5 is cooled to about -75°C. After reaching thermal equilibrium, each specimen is subjected to a torsion test. That is, for each test piece, the torsion actuator 8 twists the torsion wire 9, and the torsion angle is read by the torsion detection means 10 and stored in the computer section 14. Next, while controlling the heater with the temperature control means, repeat this operation for each temperature (can be set arbitrarily) until room temperature is reached.
Finish the exam. After all tests are completed, the computer will
Specific modulus (T ₂ , T ₅ ,
T ₁₀ , T ₁₀₀ ) and torsional properties such as rigidity are calculated and hammered out. The method for calculating the ratio modulus using a computer is as follows. RM=(180−θ′)/θ′/(180− _θ0 )/ _θ0where RM: Specific modulus _θ0 : Test piece torsion angle (degrees) at 23±3°C θ′: Test piece at low temperature Torsion angle (degrees) Substituting the room temperature twist angle in advance from the above formula,
Find θ′ of T _o . Next, in the JIS test method, the temperature corresponding to θ' is determined from the graph. Next, using the data (temperature - angle) stored in the computer and the data of the 7 points before and after θ' closest to θ', the cubic formula (y = ax ³ + bx ² + cx + D y: temperature x: torsion angle) is used. Find an approximation. T ₂ T ₅ T ₁₀ T ₁₀₀ −−−− −−−− −−−− −−−−−θ′ ₂ −θ′ ₅ −′ ₁₀ −θ′ ₁₀₀ FIG. 6 shows another preferred embodiment of the present invention. It is a conceptual diagram of an example. In this embodiment, the constant temperature bath 11 is fixed,
An auxiliary tank 21 is provided which is connected to the constant temperature bath 11 via a flexible communication pipe 20. Auxiliary tank 21
A refrigerant or a refrigerant and a cryogen are put into the tank, and the auxiliary tank 21 is moved up and down, and the cooled refrigerant is sent into the constant temperature bath 11 through the communication pipe 20. The other configurations are the same as in FIG. g Test Example 1 (Sample: NBR with low nitrile content) The repeatability of temperature with respect to the specific modulus specified in JIS K 6301 of the same sample with n = 5 was determined (as a torsion actuator, it is operated by air pressure and rotates at a constant angle). After applying rotation to the elastic member,
(Using an actuator that has a function of holding the rotational position for a predetermined period of time and then automatically rotating the elastic member in the opposite direction to return to the original position before rotation.) The results are as follows, and the accuracy of the device of the present invention is superior to that of the conventional method.

[Table] Example 2 (Sample: NBR with high nitrile content) A comparative test similar to that of Example 1 was conducted by changing the sample.

[Table] h Effects of the invention According to the invention, an actuator operated by pneumatic pressure or an electromagnetic motor is used as a device for rotating the test piece, and by combining other devices of the invention, it is possible to achieve results that could not be expected based on conventional knowledge. The rigidity modulus of a test piece can be automatically measured quickly and accurately.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of a preferred embodiment of the present invention, Fig. 2 is a perspective view showing the attachment of a test piece, Fig. 3 is a plan sectional view of the torsion actuator, and Fig. 4 is an elevational sectional view of Fig. 3. , FIG. 5 is a conceptual diagram showing temperature control of a constant temperature bath, and FIG. 6 is a conceptual diagram of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Sample holder, 2... Frame, 3... Test piece fixing member, 4... Connection member, 5... Test piece,
6, 7...Chuck, 8...Torsion actuator, 9...Twisted wire, 10...Torsion angle detection means, 11...Thermostat, 11a...Insulated container, 1
1b...Heating means, 11d...Temperature measuring means, 11d
... rail, 12 ... temperature control means, 13 ... guide, 14 ... computer section.

Claims (1)

[Claim for Utility Model Registration] A connecting member that connects one end of the test piece and one end of the twisted wire, a test piece fixing member that fixes the other end of the test piece, and the other end of the twisted wire that is rotated by a predetermined angle. a torsion actuator, a torsion angle detection means for detecting a rotation angle of the coupling member, a torsion actuator control means for controlling the torsion actuator, and a data processing means for calculating a torsion characteristic value based on the output of the torsion angle detection means. a sample holder to which the fixing member and the torsion actuator are fixed and the coupling member is rotatably fixed; a thermostatic chamber having a heating means and a stirring device; a temperature control means for controlling the temperature within the thermostatic chamber;
It is equipped with a sample holder moving means for moving the sample holder and/or a constant temperature chamber moving means for moving the thermostatic chamber, and measures the torsional characteristic value of the sample piece at a predetermined temperature with the sample holder placed in the thermostatic chamber. An automatic torsion testing machine characterized by: