JPH0740200Y2 - Wire twist tester - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to a twisting test apparatus for wire rods using a rotary encoder as an expansion / contraction detector. For example, tungsten, molybdenum, nickel, copper, etc. used for a tube can be used. The present invention relates to a wire twisting tester for evaluating a twisting property, which is one of the mechanical properties of a thin wire.

2. Description of the Related Art A conventional twisting test apparatus for a wire of this type will be described with reference to FIG. A conventional wire rod torsion test apparatus is a shaft (2) having a wire rod passage hole (9) and a wire rod mounting screw (10) at the inner end of a motor (1) and a shaft (2) of the motor (1). 2) A rotary head (8) that rotates integrally with the rotary head (8) is attached, and a mechanical tachometer (38) is attached to the other end of the shaft (2) of the motor (1), and the rotary head (8) is spaced a predetermined distance from Attach the round bar-shaped detection head (15) to the base of the pointer (39) and place the pointer (39) together with the detection head (15).
Is formed so as to rotate on the scale plate (41) of the telescopic length measuring instrument (40), and the weight (4
A balance arm (43) having 2) is attached so as to move up and down, and a wire breakage detection switch (44) is attached to a lower portion of the tip end of the balance arm (43).

Then, one end of the wire rod (24) to be tested is attached with the wire rod mounting screw (10) provided on the rotary head (8) which is rotated by the motor (1), and the wire rod is attached to the round bar-shaped detection head (15). The detection head (15) is wound several times and hung downward, the other end is attached to the balance arm (43), and a constant tension is applied to the wire rod (24) by the weight of the balance arm (43). The wire (24) is twisted through the rotary head (8) by rotating the motor (1). When the wire rod (24) is twisted, it extends in length and contracts (increases or decreases in length). The detection head (15) rotates in response to the expansion or contraction, and the expansion / contraction length measuring instrument (40). Since it is transmitted as a rotational displacement (change in rotational angle) to the needle, the change in deflection of the pointer (39) due to rotational displacement is read by the scale plate (41) and measured as the expansion / contraction length of the wire rod based on the preset conditions. There is. At the same time, the number of revolutions of the rotary head (8), that is, the number of twists of the wire (24) is read and measured by a mechanical tachometer (38) connected to the shaft (2). The twisting characteristic of the wire is evaluated by measuring and recording the number of twists and the corresponding expansion and contraction length, and then graphing the data as correlation data. Wire rod (24)
When the screw is twisted and cut, the balance arm (43) falls and hits the disconnection detection switch (44) arranged below the balance arm (43). Therefore, the disconnection detection switch (44) works and the motor (1) operates. Stop.

Problem to be solved by the invention The expansion / contraction length ratio of a wire rod due to twisting depends on the type of wire rod (material,
Depending on the wire material, the expansion / contraction length ratio is as small as a few percent, and the expansion / contraction length measuring instrument requires high resolution and high accuracy, and the expansion / contraction length ratio is as large as several tens of percent. Wires require a wide range of readings.

In the conventional device, the expansion / contraction length measuring instrument is of the pointer type, and the resolution and reading accuracy are low, so the reliability of the measurement data is low, and the range in which the expansion / contraction length can be read (measurable range) is narrow. There is a limit to the type of wire that can be measured with the test equipment.

Further, in the pointer method, since reading requires skill, the read value may change depending on the measurer, and the reliability of the measured data is further reduced.

Depending on the type (material) of the wire material, the mechanical properties may change subtly due to heating, so it may be necessary to perform heat treatment before the test, but since the torsion tester does not have a heat treatment function, it is dedicated to heat treatment. There is a problem that the work efficiency is poor because the measurement is performed after the heat treatment with the device.

In view of this, the present invention uses a rotary encoder, which is often used as a functional component for automation of industrial equipment, for example, digital display type measuring instruments and position control of robots, because it has a small rotation starting torque, it rotates freely and freely. Rotation), high accuracy, and high resolution of rotational displacement (change of rotational angle) (eg, resolution can be decomposed into 600/1
Focusing on the point of (rotation), a rotary encoder is used as an expansion / contraction detector that detects changes in the expansion / contraction length of the wire due to twisting, and changes in expansion / contraction length are converted into rotational displacement (change in rotation angle). An object of the present invention is to provide a twisting test apparatus for a wire rod by which the expansion / contraction length of the wire rod can be easily measured by counting the number of pulse signals output according to the rotational displacement.

Means for Solving the Problems In order to achieve the above object, in a twisting test apparatus for a wire rod of the present invention, a rotary head having a wire rod mounting device that is rotated by a motor and a predetermined distance from the rotary head are provided. In a twisting test apparatus for a wire rod, which is provided with a detection head formed so as to be able to wind the wire rod around the peripheral surface and rotate in response to expansion and contraction of the wire rod, a rotary device that outputs the rotation of the detection head as a pulse signal. It is configured by including an encoder and a reading device for reading the output pulse signal. As a specific reading means, the number of output pulse signals can be read using a digital display type pulse counter, or a personal computer can be combined to perform data processing from reading to more efficiently obtain measurement results. Can be considered.

It is also possible to provide a heat treatment function for the current-carrying wire rod so that the wire rod can be subjected to heat treatment as a pretreatment while the wire rod is attached to the twisting tester.

Action Attach one end of the wire to be tested to the rotary head and wrap the other end around the detection head to give the wire a certain tension.
When the rotary head is rotated by the motor, the wire is twisted. When the wire is twisted, the distance between the rotary head and the detection head is constant, so the detection head rotates toward the rotary head when the length of the wire becomes shorter, and turns outward when the length of the wire becomes longer. Work to do. The twisting test apparatus for wire according to the present invention outputs this rotation amount of the detection head as a pulse signal by the rotary encoder, and then measures this output signal by the reading device. That is,
The expansion and contraction length of the wire rod can be set by setting the outer circumference of the detection head to a length proportional to the resolution of the rotary encoder.
The value can be read in proportion to the number of output pulse signals. For example, if the resolution of the rotary encoder is 600 resolutions per rotation and the outer circumference of the detection head is 30 mm, the proportional value with the output pulse signal is 1 pulse, 30 mm divided by 600 resolution (600 pulses) = 0.05 mm. .

For more accurate measurement, the thickness of the wire wound around the outer circumference of the detection head should be taken into account, that is, the diameter should be set smaller.

Example An example will be described with reference to FIGS. 1 to 3.

(1) is a rotation driving motor using a pulse motor, and includes a timing pulley (3) attached to a shaft (2) and a timing pulley (5) provided outside a metal box (4). Suspend the timing belt (6),
A shaft hole is bored in the center of the timing pulley (5), the shaft (7) is attached, and the rotary head (8) is attached to the end of the shaft (7), and the timing pulley (3) (5) is attached.
And the rotary head (8) are formed so as to rotate synchronously. A wire rod through hole (9) is formed at the tip of the rotary head (8), and a wire rod mounting screw (10) is provided below. (1
1) is a bearing that supports the shaft (7). Reference numeral (12) is a tachometer, which counts the number of revolutions of the motor (1) from the rotation of the shaft (13) and outputs the counted number as a revolution signal of a pulse signal to the motor (1). 13) Attach via. A cylindrical detection head (15) is attached to the outside of the box (4), and a rotary encoder that functions as an expansion / contraction detector of the expansion / contraction length measuring instrument inside the box (4) is attached to the base end of the detection head (15). (16) is attached. A peripheral groove (14) is provided on the peripheral surface of the tip of the detection head (15) so as to be linear with the wire passage hole (9). (17) is a signal exchanger for converting the number of pulse signals corresponding to the rotational displacement (rotation angle change) output from the rotary encoder (16) into a BCD signal, which is sent to the personal computer (18). It is connected to input.
A personal computer (18), a rotation speed control circuit (19) and a pulse signal so that the rotation speed control circuit (19) for controlling the rotation speed of the motor (1) inputs the rotation speed control signal to the pulse signal generator (20). Connect the generator (20),
Further, the motor driver (21) and the pulse signal generator (20) are connected so that a drive pulse signal is supplied from the pulse signal generator (20) to the motor driver (21), and the motor driver (21) drives the motor (1 The motor driver (21) and the motor (1) are connected so as to supply a drive current to the motor. Further, the personal computer (18) and the pulse signal generator (20) are connected so that the personal computer (18) can directly send a rotation start or stop command signal to the pulse signal generator (20). Further, the personal computer (18) is directly connected to the personal computer (18) so that the personal computer (18) can read the revolution signal output from the revolution counter (12) that counts the revolution of the motor (1). . (22) is a monitor TV, which is an accessory device of the personal computer (18), and (23) is a printer. The touch sensor (25) and the personal computer (18) are connected to each other in order to determine the disconnection of the wire (24) to be tested and send a disconnection signal to the personal computer (18). The relay (26) has a rotary encoder (16) and a touch sensor (2) to connect and disconnect the circuit with the antenna wire (27).
5) Provide between them.

As shown in FIG. 1, a movable energizing terminal (37) is provided on the side of the detection head (15) to heat-treat the wire (24) as a pretreatment for the test, and a heat treatment start switch (3) is provided.
By the operation of 2), the energizing terminal (37) rotates and comes into contact with the side surface of the detection head (15), and the heat treatment current is detected by the detection head (15), the rotary head (8), the bearing (11), and the metal. Flowing through the box (4), the wire (24) is configured to be heat treated. (45) is an insulating member. (46) is a power switch.

Then, attach one end of the wire under test (24) to the rotary head (8).
The wire rod mounting screw (10) through the wire rod hole (9)
The wire rod (24) is wound around the detection head (15) several times, and a constant weight is applied to the entire wire rod (24) by the weight (42). The weight of the weight (42) is selected according to the type of the wire rod (24), for example, the material and the thickness. When the rotational speed of the rotary head (8) is input to the personal computer (18), the rotational speed is set in the rotational speed control circuit (19). Next, when a program execution instruction is input, a rotation speed control signal is input to the pulse signal generator (20) from the rotation speed control circuit (19) controlled by the personal computer (18), and at the same time, the personal computer (18). Sends a rotation start command signal to the pulse signal generator (20), and the pulse signal generator (20) sends a driving pulse signal to the motor driver (21). Therefore, the motor driver (21) drives the motor (1 ) Is supplied with a drive current, and the motor (1) rotates at a rotation speed based on the rotation ratio with the rotary head (8) previously set and stored in the program of the personal computer (18).
Tachometer (12) that counts the number of rotations of the motor (1)
The rotation speed signal from the personal computer (18)
And the number of rotations of the rotary head (8) is calculated based on the rotation ratio. The calculated number of revolutions is used as data of the number of twists of the wire rod (24) that is twisted integrally with the rotary head (8). With respect to the rotation of the motor (1), the rotation of the timing pulley (3) is transmitted to the rotary head (8) from the timing pulley (5) by the timing belt (6), and the wire rod (24) is twisted. The wire rod (24) is twisted by the rotation of the rotary head (8), and the length is expanded and contracted between the rotary head (8) and the detection head (15), and the change in the expansion and contraction rotates the detection head (15). I will let you. That is, when the wire rod (24) is twisted and contracted, the detection head (15) rotates inward, but when the wire rod (24) extends by, for example, a weight (42), it rotates outward. The rotation of the detection head (15) is transmitted to the rotary encoder (16) and is detected by the rotary encoder (16) as a rotational displacement (change in rotational angle), and a number of pulse signals corresponding to the rotational displacement are output. The pulse signal is converted into a binary coded decimal BCD signal by a signal converter (17), and the converted BCD signal is converted into a personal computer (1
It is sent to 8) and read, and used as the data of the expansion / contraction length of the wire (24). The personal computer (18) displays the correlation line graph on the monitor TV (22) as a correlation line graph by a program for processing the number of twists and the expansion / contraction length of the wire rod (24) read simultaneously as correlation data. It is possible to immediately see the change in the expansion / contraction length as the number of twists increases. After the measurement is completed, the correlation line graph is printed by the printer (23). Save the data required for storage on the storage disk of the personal computer (18). If the wire (24) is broken during the measurement, the touch sensor (25) outputs a disconnection signal to the personal computer (18), and the personal computer (18) outputs a rotation stop command signal for the motor (1) to output the motor. The rotation of (1) is stopped. When the rotation stops, the correlation line graph displayed on the monitor TV (22) is programmed in the personal computer (18) so that the line of the graph drawn at that time stops, and the wire rod (24) is broken. You can know the length of expansion and contraction and the number of twisting revolutions.

When the wire rod (24) is heat-treated as a pretreatment for measurement, a current controller (29) for adjusting the heat-treatment current provided on the operation panel (28) and a current-carrying timer (30) are used to control the current flow. Set the conditions of current amount and energization time in (31).
Next, when the heat treatment start switch (32) is operated, the small motor (33) is rotated, and the pulley (34) is rotated, the pulley (35) is rotated via the belt (36), and the energizing terminal (37) is connected. Rotate and connect the energizing terminal (37) to the detection head (1
When the heat treatment current is supplied while being pressed against and held against the side surface of 5), the heat treatment current is detected under the set conditions by the detection head (15), wire rod (24), rotary head (8), bearing (11) and box (4). ), The wire (24) is heated and heat treated. In this case, the energization control circuit (31) controls the relay (26) immediately before energization to disconnect the antenna wire (27) circuit connecting the touch sensor (25) and the rotary encoder (16) during heat treatment. , Prevent the heat treatment current from flowing to the touch sensor (25).

In the above embodiment, the rotary encoder (1
6) and tachometer (12) to personal computer (1
Although the description has been given by taking the twisting test device for the wire connected through 8) as an example, the present invention is not limited to this.
A pulse encoder (16) that functions as a pulse signal (rotation signal) output from the tachometer (12) and an expansion / contraction detector by connecting a pulse counter such as a digital display type pulse counter instead of the personal computer (18). Directly counts the pulse signal output by the pulse counter, and reads the number of twists and the length of expansion and contraction according to the display value of the pulse counter. It includes all twisting test devices for wire rods that read the number of pulse signals according to the rotational displacement and measure the expansion / contraction length of the wire rods.

Effect of the Invention In the twisting test apparatus for a wire rod according to claim 1, when a rotary encoder is used as the expansion / contraction detector of the expansion / contraction length measuring instrument of the torsion test apparatus, the accuracy is high and the resolution of the rotational displacement is also high. The accuracy of the measurement is high and the connection with the personal computer is easy, so that the measurement can be easily automated.

In addition, since the rotary encoder rotates infinitely, the range in which the expansion / contraction length can be read (measurable range) is extremely wide, and it is possible to measure many types of wire rods with the same test equipment.

In addition, since the pulse signal output by the rotary encoder can be measured by a digital display type pulse counter, the accuracy of reading the expansion / contraction length of the wire rod is higher than that of the conventional device even with this method, and it does not require any skill, so it can be measured by the operator. The read value does not change, and highly reliable measurement data can be obtained.

In the twisting test apparatus for a wire rod according to the second aspect, the work efficiency of measurement is improved by providing a heat treatment function for the current-carrying wire rod and performing the heat treatment while the wire rod is attached to the test device.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an essential part of a wire rod twisting test apparatus according to the present invention, FIG. 2 is a front view of the wire rod twisting test apparatus of the present invention, and FIG. FIG. 4 is a block diagram showing the control and measurement system of FIG. 4, and FIG. 4 is an explanatory diagram of a conventional wire rod torsion test apparatus. 1 ... Motor, 4 ... Box 8 ... Rotating head, 15 ... Detection head 16 ... Rotary encoder, 24 ... Wire rod

Claims (2)

[Scope of utility model registration request] 1. A rotary head (8) having a wire rod mounting device which is rotated by a motor (1), and a wire rod (24) which can be wound around a peripheral surface at a predetermined interval from the rotary head (8) and at the same time. In a twisting test apparatus for a wire, which is provided with a detection head (15) formed so as to be able to rotate in response to expansion and contraction of a wire, a rotary encoder (16) for outputting the rotation of the detection head (15) as a pulse signal A twisting test device for a wire rod, comprising: a reading device for reading the output pulse signal. 2. The wire rod according to claim 1, wherein a heat treatment device is provided so as to heat the wire rod by applying a heat treatment current from the detection head (15) and the rotary head (8). Torsion test device.