CN1789941A - Automatic correction system for ergometer and correction method thereof - Google Patents

Abstract

The invention provides a method for automatic calibration of a dynamometer. The method includes: providing a load sensor connected to the dynamometer to be calibrated and a single-chip microcomputer, a driver, and a motor connected in series on a measuring machine; serial port to transmit the command to calibrate the dynamometer sent by the client computer; control the dynamometer to move left and right; if the dynamometer reaches the calibration point, control it to stop moving, waiting for the load cell and the dynamometer At the same time, obtain the stable reading; judge whether the difference between the two readings is within the allowable accuracy range; judge whether the last calibration point is reached; if so, judge whether the calibration task is completed; Differences in calibration points that fail are marked. The invention also provides an automatic calibration system for the dynamometer. The invention can respectively set and automatically pull and press to the calibration points, read the readings of the dynamometer and export the calibration results to generate reports.

Description

Automatic Calibration System and Method for Dynamometer

【Technical field】

The invention relates to a dynamometer calibration system and method.

【Background technique】

When calibrating each mode of operation (tension or compression) of the dynamometer, the traditional way of dynamometer calibration is to use the method of manually lifting weights for calibration. That is to set several calibration points in each operation mode of the dynamometer. For example, a 50-kilogram electronic dynamometer has two operation modes of tension and pressure. Now set five points in its tension operation mode. The five calibration points are ten kilograms, twenty kilograms, thirty kilograms, forty kilograms and fifty kilograms. Use weights to calibrate at each calibration point, put a 10-kg weight on the 10-kg calibration point, and add weights to the subsequent calibration points in turn. Also set five calibration points in its pressure operation mode, and calibrate each calibration point by placing weights. It is shown that the calibration using this traditional method of lifting weights is neither accurate nor safe enough.

Therefore, it is necessary to propose a system and method for automatically calibrating the dynamometer, which can calibrate the dynamometer in the tension operation mode or the pressure operation mode, and improve the accuracy and safety of the calibration.

【Content of invention】

The object of the present invention is to provide an automatic calibration system for a force gauge.

Another object of the present invention is to provide an automatic calibration method for a dynamometer.

The invention discloses an automatic calibration system for a dynamometer. The automatic calibration system for a dynamometer includes a client computer and a measuring machine on which the dynamometer to be calibrated is placed. A load cell for force measurement is installed on the measuring machine, the load sensor is connected with the dynamometer to be calibrated, and a single chip microcomputer, a driver and a motor connected in series are also installed on the measuring machine. The client computer has two RS-232C interfaces, one RS-232C interface is connected with the single-chip microcomputer, and when the dynamometer is being calibrated, an order can be sent to the single-chip microcomputer through the RS-232C interface. Send a pulse, and the driver drives the motor to run, so as to control the left and right movement of the dynamometer to be calibrated.

A gauge head is also installed on the load sensor for displaying the reading of the load sensor. The reading of the load cell is transmitted to the client computer through the RS-232C interface and displayed.

If the dynamometer to be calibrated is an electronic dynamometer, another RS-232C interface is connected to the electronic dynamometer through a data cable, and the measurement data of the electronic dynamometer can be obtained during the calibration process.

If the dynamometer to be calibrated is a mechanical dynamometer, the reading of the mechanical dynamometer to be calibrated can be read out by the user and then entered into the user terminal computer.

The client computer also has a data storage area for storing the data of each correction.

The client computer also includes a system initialization module, a judgment module, a data acquisition module, and a command sending module. The system initialization module is used to start the calibration system, set the material number, type, calibration point, calibration times, and calibration tasks of the dynamometer to be calibrated, and reset the reading of the load cell to zero. The judging module is used to judge whether the material number of the dynamometer to be calibrated has been set, whether the reading of the load cell has been received, whether the reading of the load cell has been reset to zero, whether the dynamometer to be calibrated has reached the calibration point, and whether all the calibration points have been corrected. After the calibration is completed, whether the calibration task of the dynamometer to be calibrated is completed and whether the difference between the readings of the load cell and the dynamometer is within the allowable accuracy range, etc. The data acquisition module is used to acquire the readings of the dynamometer to be calibrated and the readings of the head of the load cell. A command sending module is used to send a calibration command to the measuring machine.

The present invention also discloses a method for automatic calibration of a dynamometer, which provides a client computer and a measuring machine on which the dynamometer to be calibrated is placed. Calibrate the load cell connected to the dynamometer; (b) provide a series-connected single-chip microcomputer, driver and motor on the measuring machine; (c) provide an RS-232C interface connected to the single-chip microcomputer on the user-end computer, and measure the machine through this interface The station receives the command to start the system and calibrate the dynamometer sent by the client computer; (d) start and initialize the system; (e) select the calibration task; (f) send the calibration command to control the left and right movement of the dynamometer to be calibrated; (g ) to determine whether the dynamometer to be calibrated reaches the calibration point; (h) if the dynamometer to be calibrated reaches the calibration point, send a command to control the dynamometer to be calibrated to stop moving, and wait for the load cell and the dynamometer to be calibrated to (i) obtain the readings of the load cell and the dynamometer to be corrected at the same time, and save the above readings; (j) judge whether the difference between the load cell reading and the lbometer reading is within the accuracy range; (k) If it is within the accuracy range, then judge whether to reach the last calibration point; (l) if it reaches the last calibration point, then judge whether the calibration task is completed; (m) export all the calibration data to the report form, and in the report form The difference of unqualified calibration points is marked, and this calibration ends.

Through the present invention, electronic and mechanical dynamometers can be calibrated, and calibration points can be set respectively, automatically pulled and pressed to the calibration points, readings of electronic dynamometers can be automatically read, and calibration results can be exported to generate reports.

【Description of drawings】

Fig. 1 is a hardware architecture diagram of the dynamometer automatic calibration system of the present invention.

Fig. 2 is a functional block diagram of the client computer of the present invention.

Fig. 3 is a flow chart of the automatic calibration method of the dynamometer of the present invention.

【Detailed ways】

Referring to Fig. 1, it is a hardware architecture diagram of the dynamometer automatic calibration system of the present invention. The dynamometer automatic calibration system includes a client computer 11 and a measuring machine 15 for placing the dynamometer to be calibrated. A load cell 18 is installed on the measuring machine platform 15 . A load cell 17 to be calibrated is placed on the measuring machine platform 15 and connected to a load cell 18 . The load cell 18 is used for force measurement, and a meter 19 displaying the reading of the load cell 18 is mounted on it.

The measuring machine 15 has a built-in single-chip microcomputer 16 , a driver 14 , and a motor 13 . The client computer 11 has two serial ports, which are RS-232C interfaces 12 in the present embodiment, and one of the RS-232C interfaces 12 is connected with the single-chip microcomputer 16, and can be sent through the RS-232C interface 12 when correcting the dynamometer. The command is given to the single-chip microcomputer 16, and when the single-chip microcomputer 16 receives the command, it sends pulses to the driver 14, and the driver 14 drives the motor 13 to run, thereby controlling the movement of the dynamometer 17 to be corrected. The meter head 19 shows that the reading of the load sensor 18 is also transmitted to the client computer 11 through the RS-232C interface 12 and displayed. Another RS-232C interface 12 is connected to the dynamometer 17 to be calibrated via a data line (not shown in the figure), and the measurement data of the dynamometer 17 to be calibrated can be acquired during the calibration process.

The client computer 11 also has a data storage area 20 for storing the data of various corrections.

Referring to FIG. 2 , it is a functional block diagram of the client computer of the present invention. The client computer 11 includes a system initialization module 111 , a judgment module 112 , a data acquisition module 113 and a command sending module 114 . The system initialization module 111 is used to start the calibration system, set the material number, type, calibration point, calibration times, and calibration tasks of the load cell 17 to be calibrated, and reset the reading of the load cell 18 to zero. The judging module 112 is used to judge whether the material number of the dynamometer 17 to be calibrated has been set, whether the reading of the load cell 18 has been received, whether the reading of the load cell 18 has been reset to zero, and whether the dynamometer 17 to be calibrated has reached the calibration point. Whether the calibration points of the dynamometer 17 to be calibrated are all calibrated, whether the calibration task of the dynamometer 17 to be calibrated is completed, and whether the difference between the readings of the load cell 18 and the readings of the dynamometer 17 to be calibrated is within the allowable accuracy range, etc. . The data acquisition module 113 is used to acquire the readings of the load cell 17 to be calibrated, the readings of the load cell head 19 and the like. The command sending module 114 is used for sending the calibration command to the measuring machine 15 .

Among them, there are two types of force gauges, one is electronic and the other is mechanical. The calibration point of the dynamometer can be set before each calibration. For example, for an electronic dynamometer of 50 kg, one calibration point can be set at 10 kg, and there are five calibration points in total, namely: 10 kg, 2 10kg, 30kg, 40kg and 50kg. When the electronic dynamometer is used, it can be measured in the operation mode of tension and pressure. Therefore, there are two calibration tasks for calibrating the electronic dynamometer: one is to correct the tension method; the other is to correct the pressure method. There will be five calibration points during the calibration tension mode and five calibration points during the calibration pressure mode for the electronic type force gauge of 50 kilograms. For a 50kg mechanical dynamometer, five calibration points can also be set, but the mechanical dynamometer only has one measurement method of tension, so there is only one calibration task of the mechanical dynamometer, that is, to correct the tension method.

Referring to Fig. 3, it is a flow chart of the automatic calibration method for the dynamometer of the present invention. First, start the calibration system and perform system initialization through the system initialization module 111, including setting parameters such as the material number, type, maximum range (unit Kg), and allowable accuracy range of the dynamometer 17 to be calibrated, and test whether the load can be received. The reading of the sensor 18, and then reset the reading of the load cell 18 to zero (step 300). In this step S300, if the type of the dynamometer 17 to be calibrated is an electronic dynamometer, its measured value can be obtained through the RS-232C interface and displayed on the screen of the client computer 11; If the force gauge is used, the measured value can be directly read by the user and then entered into the user terminal computer 11 and displayed.

After the system is initialized, it receives a calibration task selected by the user according to the type of the dynamometer 17 to be calibrated. The dynamometer 17 to be calibrated can be an electronic dynamometer or a mechanical dynamometer. The calibration task of the electronic dynamometer has two ways of pulling and pressing, and the calibration task of the mechanical dynamometer has only one way of pulling (step S301). The correction command is sent by the command sending module 114 to control the left and right movement of the dynamometer 17 to be corrected (step S308 ). The judging module 112 judges whether the dynamometer 17 to be calibrated has reached the calibration point (step S310 ). If the dynamometer 17 to be calibrated does not reach the calibration point, then return to step S308, if the dynamometer 17 to be calibrated reaches the calibration point, the command sending module 114 sends a command to control the dynamometer 17 to be calibrated to stop moving, and Wait for the readings of the load cell 18 and the load cell 17 to be calibrated to be stable (step S312 ). It is judged whether the readings of the load cell 18 and the load cell 17 to be calibrated are stable (step S314 ). If it is not stable, return to step S312 and continue to wait. If the readings of both are stable, then simultaneously obtain the readings of the load cell 18 and the load cell 17 to be calibrated (step S316 ). Store the above readings in the data storage area 20 (step S317). It is judged whether the difference between the reading of the load cell 18 and the reading of the load cell 17 to be calibrated is within the allowable accuracy range (step S318 ). If the difference between the two is not within the allowable precision range, then the correction point of the dynamometer 17 to be corrected is marked as unqualified, and then enter step S319 (step S322); if the difference between the two is within the allowable precision range Then judge whether to reach the last correction point (step S319). For example: a 50kg dynamometer can have five calibration points, which are 10kg, 20kg, 30kg, 40kg and 50kg. After reaching the first calibration point of 10kg, get the reading and then A command is sent to control the dynamometer 17 to be calibrated to continue to move to the second calibration point until all the calibration points are calibrated. Therefore, in this step S319, if the last calibration point is not reached, then return to step S308, and if the last calibration point is reached, it is judged whether the current calibration task is completed (step S320). If in step S320, it is judged that the calibration task has not been completed, then return to step S301 to receive another calibration task selected by the user, and re-execute this process; if it is judged that the calibration task has been completed, all the calibration data will be stored in an electronic form (Excel) mode to export, and the difference between the reading of the load cell 18 of the unqualified calibration point and the reading of the dynamometer 17 to be calibrated is marked (step S324), and this calibration is finished (step S328).

Claims (15)

1. dynamometer automatic correction system comprises that a user end computer and places the measurement board of dynamometer to be corrected, it is characterized in that:

On the described measurement board load sensor is installed, this load sensor links to each other with dynamometer to be corrected, and this measurement board also is built-in with a single-chip microcomputer, a driver and the motor that polyphone connects;

Described user end computer has the dual serial port, an one serial port links to each other with single-chip microcomputer, when proofreading and correct dynamometer, can send order to single-chip microcomputer by this serial port, after receiving this order, single-chip microcomputer sends out pulse to driver, driver CD-ROM drive motor running again, thus dynamometer side-to-side movement to be corrected controlled.

2. dynamometer automatic correction system as claimed in claim 1 is characterized in that, described serial port is the RS-232C interface.

3. dynamometer automatic correction system as claimed in claim 1 is characterized in that, a gauge outfit also is installed on the described load sensor, is used to show the reading of load sensor.

4. dynamometer automatic correction system as claimed in claim 1 or 2 is characterized in that, wherein the reading of load sensor is to send user end computer to and be revealed by this serial port.

5. dynamometer automatic correction system as claimed in claim 1 or 2 is characterized in that, dynamometer wherein to be corrected is the electronic type dynamometer.

6. dynamometer automatic correction system as claimed in claim 5 is characterized in that, wherein another serial port links to each other by data line with described electronic type dynamometer, can obtain the measurement data of this electronic type dynamometer in trimming process.

7. dynamometer automatic correction system as claimed in claim 1 is characterized in that, dynamometer wherein to be corrected is the mechanical type dynamometer.

8. dynamometer automatic correction system as claimed in claim 1 is characterized in that, described user end computer also has a data storage district, is used to store the data of each time correction.

9. dynamometer automatic correction system as claimed in claim 1 is characterized in that, described user end computer comprises:

One system initialization module is used to start this corrective system, sets item number, kind, check point, number of corrections, the correction tasks of dynamometer to be corrected, and the reading of load sensor is made zero;

One judge module, be used to judge whether dynamometer item number to be corrected is set, whether the reading of load sensor receives, whether the reading of load sensor makes zero, whether dynamometer to be corrected arrives check point, whether the check point of dynamometer to be corrected is all proofreaied and correct finishes, this correction tasks of dynamometer to be corrected whether finish and the difference of judging load sensor reading and dynamometer reading whether in allowing accuracy rating;

One data acquisition module is used to obtain the reading of dynamometer to be corrected and the reading of load sensor gauge outfit;

One order sending module is used for sending corrective command to measuring board.

10. one kind is utilized the described system of claim 1 to carry out the method for dynamometer from normal moveout correction, it is characterized in that the method comprising the steps of:

Start and initialization system;

Select correction tasks;

Send corrective command, control dynamometer side-to-side movement to be corrected;

Judge whether dynamometer to be corrected arrives check point;

If this dynamometer to be corrected arrives check point, then send this dynamometer stop motion to be corrected of order control, and wait for the stable reading of load sensor and this dynamometer to be corrected;

Obtain the reading of load sensor and this dynamometer to be corrected simultaneously, and preserve above-mentioned reading;

Whether the difference of judging load sensor reading and dynamometer reading is in the accuracy rating that allows;

If the difference of above-mentioned reading then judges whether to arrive last check point in the accuracy rating that allows;

If arrive last check point then judge whether this correction tasks finishes;

Come out with all correction data remittance abroads and with the load sensor reading of underproof check point and the difference mark of dynamometer reading to be corrected;

Finish this correction.

11. the automatic bearing calibration of dynamometer as claimed in claim 10 is characterized in that the step initialization system also comprises the steps:

Set item number, kind, the permission accuracy rating of dynamometer to be corrected;

Set check point, number of corrections, the correction tasks of dynamometer to be corrected;

Whether the test load sensor is connected with dynamometer to be corrected;

The reading of load sensor is made zero.

12. the automatic bearing calibration of dynamometer as claimed in claim 10 is characterized in that, step judges whether to arrive check point and also comprises step:

If do not arrive check point, then resend order, control dynamometer motion to be corrected.

13. the automatic bearing calibration of dynamometer as claimed in claim 10 is characterized in that, step judges whether the difference of load sensor reading and dynamometer reading also comprises step in allowing accuracy rating:

If in allowing accuracy rating, then this check point is not labeled as defective check point.

14. the automatic bearing calibration of dynamometer as claimed in claim 10 is characterized in that, step judges whether to arrive last check point and also comprises step:

If do not arrive last check point, then resend order control dynamometer and move to next check point.

15. the automatic bearing calibration of dynamometer as claimed in claim 10 is characterized in that, step is judged whether this correction tasks finishes and is also comprised:

If this correction tasks does not finish, then turn back to the step of selecting correction tasks.