JP2006090745A - Torquemeter protecting device, and torquemeter calibrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torquemeter protecting device and a torquemeter calibrator capable of preventing surely a torquemeter from being damaged. <P>SOLUTION: This torquemeter protecting device for protecting the torquemeter in a torquemeter calibrator 1 for impressing a torque to a reference torquemeter T1 and the calibrated torquemeter T2 to calibrate the calibrated torquemeter is provided with a measuring amplifiers 31 for measuring the generated torques generated in the reference torquemeter T1 and the calibrated torquemeter T2, a judging means (for example, a CPU 34 and a control part 44) for judging whether the generated torques measured by the measuring amplifiers 31 has exceeded a predetermined prescribed value or not, and a stopping means (for example, the control part 44) for stopping the impression of the torque to the reference torquemeter T1 and the calibrated torquemeter T2, when the generated torques is judged to have exceeded the predetermined prescribed value, by the judging means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a torque meter protection device and a torque meter calibration machine in a torque calibration machine.

Conventionally, as a method of correcting an error in a torque meter, that is, a method of calibrating a torque meter, for example, it is detected by actual measurement using a table made of torque application test results performed in advance under a plurality of conditions. A method for correcting the measured torque converted from the twist angle of the shaft is known (for example, see Patent Document 1).
In addition, for example, a reference torque meter (hereinafter referred to as “reference torque meter”) and a torque meter to be calibrated (hereinafter referred to as “calibration torque meter”) are set in the apparatus. There is known a method of calibrating a calibration torque meter by applying the same torque to the torque meter and detecting the torque generated in each torque meter. In this method, if the applied torque exceeds the rated sensitivity, the torque meter will be damaged. Therefore, if the operator visually checks the output value (torque) displayed on the measurement amplifier and exceeds the rated sensitivity, Needed to stop the application of torque by pressing the emergency stop switch.
JP-A-9-61276

  However, since the manual stop operation described above is highly likely to cause human error, it has been strongly desired to prevent the torque meter from being damaged more reliably.

  An object of the present invention is to provide a torque meter protection device and a torque meter calibration machine that can prevent damage to the torque meter more reliably.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the reference torque meter and the reference torque meter in the torque meter calibration machine that calibrates the calibration torque meter by applying torque to the reference torque meter and the calibration torque meter. In the torque meter protection device that protects the calibration torque meter, a measurement device that measures the generated torque generated in the reference torque meter and the calibration torque meter, and a value of the generated torque measured by the measurement device are predetermined. A determination means for determining whether or not a predetermined value has been exceeded; and when the determination means determines that the value of the generated torque has exceeded a predetermined value, the reference torque meter and the calibration torque meter And stopping means for stopping the application of torque.

  According to a second aspect of the present invention, in the torque meter protection device according to the first aspect of the present invention, the torque meter protection device includes a plurality of the determination units, and the stop unit includes the generated torque by at least one of the plurality of determination units. When it is determined that the value exceeds a predetermined value, the application of torque to the reference torque meter and the calibration torque meter is stopped.

  According to a third aspect of the present invention, there is provided an application device that applies torque to a reference torque meter and a calibration torque meter, a measurement device that measures generated torque generated in the reference torque meter and the calibration torque meter, and the measurement device. A torque meter calibrator comprising: a control device that performs application control of the application device based on the measured generated torque; and the measurement device determines whether or not the value of the generated torque exceeds a predetermined value. First determination means for determining whether or not, and output means for outputting the result determined by the first determination means to the control device, wherein the control device is connected to the measurement device, and the measurement A second judging means for judging whether or not the value of the generated torque measured by the apparatus exceeds a predetermined value, a first judging means and a first judging means; Among the determining means, when it is determined to exceed a predetermined value the value of the generated torque by at least either the predetermined, characterized in that it comprises a stop means for stopping the application device.

  According to the first aspect of the present invention, when a torque exceeding a predetermined value is applied, application of torque to the reference torque meter and the calibration torque meter is automatically stopped by the stopping means. As compared with the case where the emergency stop is manually performed, the torque meter can be more reliably prevented from being damaged.

  According to the second aspect of the present invention, it is determined whether or not the value of the generated torque exceeds a predetermined value by the plurality of determination means, that is, determination related to stopping the application of torque to the reference torque meter and the calibration torque meter. Is carried out independently, and the torque meter can be protected several times, and damage to the torque meter can be prevented more reliably.

According to the third aspect of the present invention, the first determination means and the second determination means not only determine whether or not the value of the generated torque exceeds a predetermined value, but at least these When one determination means determines that the torque value exceeds a predetermined value, the application of torque by the applying device is automatically stopped by the stop means. As a result, the torque meter can be more reliably prevented from being damaged as compared with a case where one determination unit makes a determination alone or compared with a case where the application device is manually stopped by an emergency.
In addition, even when an abnormality occurs in the communication of one of the determination units and information relating to the stop of the applying device is not properly output to the stop unit, information is output to the stop unit by another determination unit. It becomes. As a result, the torque meter can be protected several times, and damage can be more reliably prevented.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
FIG. 1 is a block diagram showing a main configuration of a torque meter calibrating machine including a torque meter protection device exemplified as a preferred embodiment to which the present invention is applied.
As shown in FIG. 1, the torque meter calibration machine 1 sets a reference torque meter T <b> 1 as a reference and a calibration torque meter T <b> 2 to be calibrated and applies torque to each torque meter, for example. A device for calibrating T2, for example, a torque application device 2 (application device) that applies torque to a reference torque meter T1 and a calibration torque meter T2, and a reference torque meter T1 in the torque application device 2 A measuring device 3 (measuring device) that measures the generated torque generated in the calibration torque meter T2, and a control device 4 (control device) that controls the torque applying device 2 based on the generated torque measured by the measuring device 3. , Etc.
Here, the torque meter protection device that protects the reference torque meter T1 and the calibration torque meter T2 set in the torque meter calibration machine 1 includes the measurement device 3 and the control device 4.

  The torque application device 2 stops the servo motor 21 that applies torque to the reference torque meter T1 and the calibration torque meter T2, the speed reducers 22 and 22 provided between the servo motor 21 and the reference torque meter T1, and the servo motor 21. An emergency stop switch 23 is provided.

The servo motor 21 applies torque to the reference torque meter T1 and the calibration torque meter T2 based on the instruction output from the control device 4.
The speed reducers 22 and 22 decelerate the rotation speed of the servo motor output from the control device 4 and apply torque to the reference torque meter T1 and the calibration torque meter T2.
The emergency stop switch 23 forcibly stops the servo motor 21 based on a stop instruction input from an input unit (not shown).

  The measurement device 3 includes a measurement amplifier 31, an arithmetic device 32, and the like that measure the generated torque generated in the reference torque meter T1 and the calibration torque meter T2.

The measurement amplifier 31 includes an amplifier unit 311, an analog output unit 312, a digital output unit 313, and the like.
The amplifier unit 311 amplifies the electrical signals output from the reference torque meter T1 and the calibration torque meter T2.
The analog output unit 312 outputs the analog data amplified by the amplifier unit 311 to the control device 4 as generated torque data.
The digital output unit 313 converts the analog data amplified by the amplifier unit 311 into digital data by an A / D converter (not shown), and outputs the digital data to the arithmetic device 32 as generated torque data.

The arithmetic device 32 includes an input unit 33, a CPU (Central Processing Unit) 34, a RAM (Random Access Memory) 35, a storage unit 36, an input / output unit 37, and the like.
The input unit 33 inputs the generated torque data output from the digital output unit 313 of the measurement amplifier 31 and outputs it to the CPU 34.
The CPU 34 controls the respective units constituting the measuring device 3 in an integrated manner, reads a predetermined program stored in the storage unit 36, develops it in the work area of the RAM 35, and executes various processes according to the program. To do. Specifically, the CPU 34 executes a predetermined control program and executes processing for protecting the reference torque meter T1 and the calibration torque meter T2 set in the torque application device 2.
The RAM 35 forms a storage area for temporarily storing programs, data, and the like, a work area for executing the programs, and the like in various processes executed by the CPU 34.
The storage unit 36 stores various application software, programs, and the like necessary for executing the operation of the present invention. Specifically, for example, as shown in FIG. 1, a first determination program 361 input in advance is stored. Reference torque meter rated sensitivity data 362, calibration torque meter rated sensitivity data 363, measurement condition data 364, and the like input from an instruction input unit (not shown) are stored.
The storage unit 36 is configured by, for example, a ROM (Read Only Memory) or a hard disk.

The first determination program 361 is a program for determining whether or not the value of the generated torque measured by the measurement amplifier 31 has exceeded a predetermined value, and the CPU 34 has the first determination program. By executing 361, it functions as a first determination means. Specifically, the value of the generated torque data in the reference torque meter T1 measured by the measurement amplifier 31 is the reference torque meter rated sensitivity data 362 as a predetermined value input in advance from an instruction input unit (not shown). Determine whether the value is exceeded. Similarly, it is determined whether the value of the generated torque data in the calibration torque meter T2 exceeds the value of the calibration torque meter rated sensitivity data 363 as a predetermined value.
The measurement condition data 364 includes, for example, measurement conditions such as torsion direction, high speed and low speed switching point values, and high speed rotation speed.
The input / output unit 37 is connected to the control device 4 via an interface, for example, and the result determined by the CPU 34 (first determination unit), the reference torque meter rated sensitivity data 362 stored in the storage unit 36, and calibration. Torque meter rated sensitivity data 363 and the like are transmitted to the control device 4, and data transmitted from the control device 4 is received and functions as input / output means.

  The control device 4 includes a PLC (Programmable Logic Controller) 41, a servo pack 42, and the like.

The PLC 41 includes an input / output unit 43, a control unit 44, a storage unit 45, an output unit 46, and the like.
The input / output unit 43 receives an analog data input unit (not shown) for inputting analog data output from the analog output unit 312 of the measurement amplifier 31 and digital data output from the input / output unit 37 of the arithmetic device 32. A digital data input unit (not shown), an A / D conversion unit (not shown) that converts analog data into digital data, an output unit (not shown) that transmits data from the control device 4 to the measurement device 3, It has.
In the digital data input unit (not shown), a result determined by the CPU 34 (first determination unit) from the input / output unit 37, reference torque meter rated sensitivity data 362, calibration torque meter rated sensitivity data 363, measurement conditions Data 364 and the like are transmitted. These data transmitted to the input / output unit 43 are stored in the storage unit 45.
By providing the input / output unit 43 with an A / D converter (not shown), the following effects are expected. In other words, the generated torque data is acquired as analog data from the measurement amplifier 31 via the analog output unit 312, and A / D conversion is performed by an A / D converter (not shown) included in the PLC 41, for example, the measurement amplifier 31. Even if there is a defect in the A / D converter (not shown) of the PLC and proper A / D conversion is not performed, the A / D converter (not shown) of the PLC 41 performs appropriate A / D conversion. Thus, the torque meter can be reliably protected.

  The control unit 44 includes a CPU (not shown), a RAM (not shown), and the like, and controls each part of the control device 4 in an integrated manner. A predetermined program stored in the storage unit 45 Are expanded in a work area of a RAM (not shown), and various processes are executed according to the program. Specifically, the control unit 44 executes a predetermined control program and executes a process for protecting the reference torque meter T1 and the calibration torque meter T2 set in the torque application device 2.

  The storage unit 45 stores various application software, programs, and the like necessary for executing the operation of the present invention. Specifically, for example, as shown in FIG. 1, a second determination program 451 input in advance is stored. In addition to the stop program 452, the result (hereinafter referred to as "first determination result") 453 transmitted from the measuring device 3 and referred to by the CPU 34 (first determination means), and reference torque meter rated sensitivity data 362, calibration torque meter rated sensitivity data 363, measurement condition data 364, and the like are stored. The storage unit 45 is configured by, for example, a ROM (Read Only Memory), a hard disk, or the like.

The second determination program 451 is a program for determining whether or not the value of the generated torque measured by the measurement amplifier 31 exceeds a predetermined value, and the control unit 44 includes the second determination program 451. This determination program 451 functions as a second determination unit. Specifically, it is determined whether the value of the generated torque data in the reference torque meter T1 measured by the measurement amplifier 31 exceeds the value of the reference torque meter rated sensitivity data 362 stored in advance in the storage unit 45. . Similarly, it is determined whether or not the value of the generated torque data in the calibration torque meter T2 measured by the measurement amplifier 31 exceeds the value of the calibration torque meter rated sensitivity data 363 stored in the storage unit 45 in advance.
The stop program 452 includes a result (first determination result 453) determined by the CPU 34 of the arithmetic device 32 executing the first determination program 361, and the control unit 44 of the PLC 41 executes the second determination program 451. Of these results (hereinafter referred to as “second determination result”), at least one of the generated torque values is a predetermined value (reference torque meter rated sensitivity data 362, calibration torque meter). When it is determined that the rated sensitivity data 363) has been exceeded, this is a program for instructing the servo pack 42 to stop the servo motor 21, and the control unit 44 functions as a stop means by executing the stop program 452. To do.
At this time, if both the determination by the CPU 34 and the determination by the control unit 44 are determinations exceeding a predetermined value, it is a matter of course that the instruction to stop the servo motor 21 is issued. Even when it is determined that only the value exceeds the predetermined value, the servo motor 21 is instructed to stop.
Of course, the case where only one of the determinations exceeds the predetermined value includes, for example, the case where only the determination by the control unit 44 exceeds the predetermined value. The case where the controller 44 determines that only the value of the generated torque data of the reference torque meter T1 exceeds the value of the reference torque meter rated sensitivity data 362 is also included.

  The servo pack 42 performs drive control of the servo motor 21 based on an instruction from the output unit 46 of the PLC 41.

  That is, the generated torque data in the reference torque meter T1 and the calibration torque meter T2 measured by the measurement amplifier 31 is compared with the reference torque meter rated sensitivity data 362 and the calibration torque meter rated sensitivity data 363 by the CPU 34 of the arithmetic unit 32. On the other hand, the control unit 44 of the PLC 41 also compares the reference torque meter rated sensitivity data 362 and the calibration torque meter rated sensitivity data 363. Therefore, the determination as to whether the value of the generated torque data in each torque meter exceeds the value of the rated sensitivity data of each torque meter is made at two locations of the measuring device 3 and the control device 4.

  Next, torque meter protection processing in the torque meter calibration machine 1 will be described with reference to the flowchart shown in FIG.

  First, various data such as reference torque meter rated sensitivity data 362, calibration torque meter rated sensitivity data 363, measurement condition data 364, and the like are previously input to the arithmetic unit 32 from an instruction input unit (not shown) (step S1). Next, the CPU 34 transmits reference torque meter rated sensitivity data 362, calibration torque meter rated sensitivity data 363, and measurement condition data 364 to the PLC 41 (step S2). When the control unit 44 of the PLC 41 stores the received various data in the storage unit 45 (step S3), it transmits a data set completion signal to the arithmetic device 32 (step S4). When the arithmetic unit 32 receives the data set completion signal, it starts applying torque (step S5).

When the application of torque is started, the measurement amplifier 31 acquires the torque generated by the reference torque meter T1 and the calibration torque meter T2 (step S6). The measurement amplifier 31 transmits the measured analog generated torque data to the PLC 41, and substantially simultaneously outputs the digital generated torque data converted by the A / D converter (not shown) to the arithmetic unit 32 (step S7).
In step S8, based on the generated generated torque data, the CPU 34 executes the first determination program 361 (step S8; first determination step), and the acquired first determination result 453 is input / output unit 37. To the PLC 41 (step S9). When the first determination result 453 is transmitted to the PLC 41, the CPU 34 receives the generated torque data from the measurement amplifier 31 again, and executes the processing from step S6 to step S9.

On the other hand, based on the generated torque data acquired by A / D converting the generated torque, the control unit 44 of the PLC 41 executes the second determination program 451 (step S10; second determination step), and the second Get the judgment result.
In step S11, based on the first determination result 453 and the second determination result, the control unit 44 executes the stop program 452, and any one of the determinations by the first determination unit and the second determination unit is performed. Then, it is determined whether or not it is a determination that the value of the generated torque data exceeds a predetermined value (step S11; stop process).
Here, when the value of any generated torque data does not exceed the predetermined value (step S11; No), the control unit 44 receives the generated torque data transmitted from the measurement amplifier 31 again, and receives the second The value of the generated torque data is obtained by executing the determination program 451 to acquire the second determination result, and further executing the stop program 452 based on the first determination result transmitted from the arithmetic unit 32. It is determined whether or not it is a determination that the value exceeds a predetermined value.
When the control unit 44 determines that any of the determinations is a determination that the value of the generated torque data exceeds a predetermined value (step S11; Yes), the control unit 44 stops applying torque to the servo pack 42. Is output (step S12) and the process is terminated.

According to the torque meter calibration machine 1 described above, when a torque exceeding a predetermined value is applied, the torque of the torque applied to the reference torque meter T1 and the calibration torque meter T2 is automatically controlled by the control unit 44 (stop means). Since the application is stopped, the torque meter can be more reliably prevented from being damaged as compared with the case where the emergency stop is manually performed.
Further, a determination as to whether or not the value of the generated torque exceeds a predetermined value by a plurality of determination means such as CPU 34 (first determination means) and control unit 44 (second determination means), that is, a reference torque meter Judgment regarding stopping the application of torque to T1 and the calibration torque meter T2 will be made independently, and the torque meter can be protected several times, and the damage to the torque meter can be prevented more reliably. be able to.
When at least one of the CPU 34 (first determination unit) and the control unit 44 (second determination unit) determines that the torque value exceeds a predetermined value, the control unit The application of torque by the servo motor 21 is automatically stopped by 44 (stop means). As a result, the torque meter can be more reliably prevented from being damaged as compared with a case where a single determination unit makes a determination alone or compared with a case where the servo motor 21 is manually stopped.
Further, even when an abnormality occurs in the communication of one of the determination means and data related to the stop of the servo motor 21 is not properly output to the control unit 44 (stop means), the control unit 44 is controlled by the other determination unit. Data is output to (stop means). As a result, the torque meter can be protected several times, and damage can be more reliably prevented.

  In addition, together with the torque meter protection processing by the measuring device 3 and the control device 4, the measurement condition data input to the arithmetic device 32 is output to the measurement amplifier 31 and measured on a display unit (not shown) provided in the measurement amplifier 31. By displaying the condition and generated torque data, the data may be monitored, and when each rated sensitivity is exceeded, the emergency stop switch 23 may be manually pressed to make an emergency stop. Thereby, damage to the torque meter can be prevented more reliably.

It is a block diagram which shows the principal part structure of a torque meter calibration machine provided with the torque meter protection apparatus concerning embodiment of this invention. 4 is a flowchart showing a torque meter protection process in the torque meter calibration machine 1.

Explanation of symbols

1 Torque meter calibration machine 2 Torque application device (application device)
T1 Reference torque meter T2 Calibration torque meter 21 Servo motor 3 Measuring device 31 Measuring amplifier 32 Computing device 34 CPU (first determining means)
361 First judgment program 362 Reference torque meter rated sensitivity data 363 Calibration torque meter rated sensitivity data 37 Input / output unit (output means)
4 Controller 41 PLC
42 SERVOPACK 44 Control unit (second determining means, stopping means)
451 Second judgment program 452 Stop program

Claims (3)

In the torque meter protection device for protecting the reference torque meter and the calibration torque meter in a torque meter calibration machine that calibrates the calibration torque meter by applying torque to the reference torque meter and the calibration torque meter,
A measuring device for measuring generated torque generated in the reference torque meter and the calibration torque meter;
Determining means for determining whether or not the value of the generated torque measured by the measuring device exceeds a predetermined value;
Stop means for stopping application of torque to the reference torque meter and the calibration torque meter when the determination means determines that the value of the generated torque exceeds a predetermined value. Torque meter protection device characterized. The torque meter protection device according to claim 1,
A plurality of the determination means;
The stopping means is connected to the reference torque meter and the calibration torque meter when it is determined by at least one of the plurality of determination means that the value of the generated torque exceeds a predetermined value. Torque meter protection device characterized by stopping application of torque. An application device for applying torque to a reference torque meter and a calibration torque meter, a measuring device for measuring generated torque generated in the reference torque meter and the calibration torque meter, and the generated torque measured by the measuring device based on the generated torque In a torque meter calibration machine comprising a control device that performs application control of an application device,
The measuring device is
First determination means for determining whether or not the value of the generated torque exceeds a predetermined value;
Output means for outputting the result determined by the first determining means to the control device,
The controller is
A second determination means connected to the measurement device and determining whether or not the value of the generated torque measured by the measurement device exceeds a predetermined value;
Stop means for stopping the application device when it is determined by at least one of the first determination means and the second determination means that the value of the generated torque exceeds a predetermined value. When,
A torque meter calibration machine comprising:

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