JP3286852B2 - Standard change amount setting device for load change point detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reference variation setting device,
In particular, the present invention relates to a reference change amount setting device used for a load change point detection device for detecting a change point of a temporal change amount of a load.

[0002]

2. Description of the Related Art For example, when a bearing is pressed into a bearing box by a press machine, a load measuring device using a load cell or the like is used. In this type of load measuring device, a load change point detecting device for detecting a change point of a temporal change amount of a load is used. The load change point detecting device sets a reference variation of the temporal variation of the load, and sequentially compares the temporal variation at the time of measurement with the reference variation to detect a variation point. Then, the load at the change point is displayed on the display unit.

[0003]

In the above-mentioned conventional configuration,
It is not easy to set the reference variation accurately. If an incorrect reference variation amount is set, a measurement error occurs, and the change point cannot be detected accurately. If the change point cannot be detected accurately, when displaying the load at the change point,
An erroneous load is displayed, resulting in a measurement error.

An object of the present invention is to enable an appropriate reference variation to be set. Another object of the present invention is to enable an appropriate reference variation to be automatically set.

[0005]

A reference change amount setting device according to a first aspect of the present invention is a device used for a load change point detecting device for detecting a change point of a temporal change amount of a load.
This device includes a load data acquisition unit, a variation calculation unit, a display unit, and a setting unit. The load data obtaining means obtains load data. The fluctuation amount calculating means calculates a temporal fluctuation amount of the obtained load data. The display means is for displaying the temporal variation calculated by the variation calculating means. The setting means is for setting the reference fluctuation amount in the load change point detecting device based on the temporal fluctuation amount.

[0006] According to a second aspect of the present invention, there is provided a reference fluctuation amount setting device.
A load data acquisition unit, a temporal variation calculation unit, a temporary change point calculation unit, a reference variation calculation unit, and a setting unit are provided. The provisional change point calculating means calculates a provisional change point based on the temporal variation. The reference variation calculating means is:
The reference variation is calculated based on the temporal variation before and after the temporary change point. The setting means sets the calculated reference fluctuation amount in the load change point detecting device.

[0007]

In the reference variation setting device according to the first aspect of the invention, when the load data acquisition means acquires the load data, the temporal variation of the acquired load data is calculated by the variation calculation means. Then, the calculated temporal variation is displayed by the display means. The display result is visually observed by an operator, for example, and the reference variation is set in the load change point detecting device by the setting means with reference to the display result. This setting may be performed automatically.

[0008] Here, since the temporal fluctuation amount is displayed, an accurate temporal fluctuation amount can be grasped, and the reference fluctuation amount can be set appropriately. In the reference change amount setting device according to the second invention, when the temporal change amount is calculated by the time change amount calculating means, the temporary change point calculating means is configured to change the temporary change point calculating means based on the calculated time change amount. Is calculated. Next, the reference variation calculating means calculates the reference variation based on the temporal variation before and after the temporary change point. Then, the calculated reference fluctuation amount is set in the load change point detecting device by the setting means.

Here, the reference variation can be automatically calculated from the actually obtained load data, and an appropriate reference variation can be automatically set.

[0010]

FIG. 1 shows a load measuring system employing an embodiment of the present invention. In the figure, this load measuring system has a load cell 1 and a measuring device main body 2. On the front surface of the measuring device main body 2, two display units 3a and 3b arranged vertically, input keys 4 including a mode key and a cursor key, and an RS232C terminal 5 for connecting to an external device such as a personal computer are provided. And a connector 6 for connecting to a waveform display device such as a synchroscope.

The measuring device main body 2 has a CP as shown in FIG.
U10. The input keys 4, the display units 3a and 3b, the memory 13, the RS232C interface 5a, and other input / output units are connected to the CPU 10. Also C
The load cell 1 is connected to the PU 10 via an input circuit 11 and an A / D converter 12. The CPU 10 is supplied with a measurement start signal from the press-fitting press 9 to which the load cell 1 is mounted, and is further provided with a measurement result via the output circuit 14 to the press-fitting press 9. The memory 13 stores various set values, measured values, and the like. The memory 13 has a first memory area M ₁ , a second memory area M _2, and another memory area. The first memory area M _1, the most recent measurement values, but also the measured value of one time before the second memory area M ₂ is stored.

Next, the operation of the above embodiment will be described according to the control operation of the CPU 10. In step S1 of FIG. 3, initialization is performed. In this initial setting, the initial value of the reference change amount D _t, the value of such permissible load L _M is set. In step S2, the setting of the reference change amount D _t is determined whether or not it is instructed. This determination is made, for example, based on the input state of the mode key of the input key 4. Step S3
Then, it is determined whether or not measurement start has been instructed based on whether or not a measurement start signal has been input from the press-fit press 9.
In step S4, other processes are performed, and the process returns to step S2.

[0013] proceeds to step S5 when it is determined that setting of the reference change amount D _t is instructed in step S2. In step S5, a setting mode process shown in FIG. 4 is executed. Here, first, in step S11, the count variable i is set to "1". In step S12, the memory 13
Together second memory area M ₂ to be measured by the load cell 1 the load data L, also the initial value DD ₀ of the difference value of the initial value D ₀ and temporal variation of the temporal variation of the load of the "0" set. In step S13, it fetches the load data L measured by the load cell 1 is stored in the first memory area M ₁ of the memory 13. In step S14, the load data stored from the load data stored in the first memory area M ₁ in the second memory area M ₂ is subtracted, the time variation amount D
Calculate _i .

In step S15, a temporal variation D_iWhen
Temporal variation D calculated one time ago _i-1Difference value DD from
_iAsk for. In step S16, the temporal variation D_iTo
The first memory area M is displayed on the display unit 3b.₁Stored in
The measured load data L is displayed on the display unit 3a. Stay
In step S17, the RS232C interface 5a,
Time variation D via RS232C terminal 5_iAnd load
Outputs heavy data to an external device such as a personal computer
I do. In step S18, the first memory area M ₁Stored in
Loaded load data is stored in the second memory area M_TwoTo be stored in
As a result, the second memory area M_TwoThe most recent load data
Update to

In step S19, the first memory area M ₁
Load data stored in it is determined whether exceeds the allowable load L _M. If it is determined that the load data does not exceed the allowable load L _M proceeds to step S20. Step S2
If it is 0, the variable i is incremented and the process returns to step S13. Here, by repeating the execution of steps S13 to S18, it calculates the time variation amount D _i and the difference value DD _i until the load data is allowable load L _M.

[0016] In step S19, the process proceeds to step S21 when it is determined that the load data measured exceeds the allowable load L _M. In step S21, it is determined whether to automatically set the reference fluctuation amount D _t. This judgment is made with the input key 4
Judgment is made based on the contents input via. If it is determined that the mode is the automatic setting mode, the process proceeds from step S21 to step S22. In step S22, a temporary change point of the load data is calculated. Here, the timing at which the differential value DD _i becomes the maximum value is determined to be the temporary change point of time variation amount. In step S23, performs averaging operation with temporal variation D _j-1 and the temporal change amount D _j before and after the temporary change point, determine the reference fluctuation amount D _t.

If it is determined in step S21 that the mode is not the automatic setting mode, the process proceeds to step S24. In step S24, the process waits for the operator to input a numerical value. When a numerical value is input using the input key 40, the process proceeds to step S25. Step S25 the value R that is input in assigning to the reference fluctuation amount D _t. If no numerical value is input in step S24, the process returns to step S21.

If it is determined in step S3 in FIG. 3 that a measurement start command has been issued, the process proceeds to step S6. Step S
At 6, the measurement mode processing shown in FIG. 5 is performed. here,
First, in step S31, sets the load data in the second memory area M _2. In step S32, it stores the load data L which is measured in the first memory area M ₁ by the load cell 1. In step S33, it obtains the time variation amount D ₁ from a difference between the one previous load data stored and immediate vicinity of the load data stored second in the memory area M ₂ in the first memory area M _1. In step S34, it outputs a and measured load data time variation amount D ₁ RS232C interface 5a, to an external device such as a personal computer through a RS232C terminal 5. In step S35, it displays the calculated time variation amount D _1. At step S36, displays the load data stored in the first memory area M _1.

In step S37, the temporal variation D₁But
Reference variation D_tThe load change point is detected.
It is determined whether or not it has been issued. Time variation D₁Is the reference fluctuation
Quantity D _tIf it is determined that the value does not exceed
Transition. In step S38, the first memory area M₁To
The stored load data is stored in the second memory area M_TwoStored in
It returns to step S32. This prepares for the next measurement.

[0020] In step S37, it is determined that the time variation amount D ₁ exceeds the reference variation amount D _t proceeds to step S39. In step S39, displays the load data at the time of measurement of one time before stored in the second memory area M _2. As a result, the display of the load data immediately before the load change point is held. In step S40, the displayed load data is output to the press-fit press 9 via the output circuit 14, and the process returns to the main routine.

Here, when the reference variation _Dt is set, in the case of the manual setting mode, step S24 is performed with reference to the displayed temporal variation D _i (step S16).
, The user can set an appropriate reference variation. In the case of the automatic setting mode, a tentative change point is calculated in step S22, and based on the change point, step S22 is performed.
Since the reference variation _Dt is calculated in 23, an appropriate reference variation can be automatically set.

[0022]

In the reference fluctuation amount setting device according to the first aspect of the present invention, since the calculation result of the temporal fluctuation amount is displayed, an appropriate reference fluctuation amount can be set. In the reference change amount setting device according to the second invention, a temporary change point is calculated based on the time change amount, a reference change amount is calculated based on a temporal change amount around the temporary change point, and the reference change amount is calculated. Is set in the load change point detection device, so that an appropriate reference variation can be automatically set.

[Brief description of the drawings]

FIG. 1 is a perspective view of a load measuring system employing one embodiment of the present invention.

FIG. 2 is a control block diagram thereof.

FIG. 3 is a control flowchart of a CPU.

FIG. 4 is a flowchart of a setting mode.

FIG. 5 is a flowchart of a measurement mode.

[Explanation of symbols]

 2 Measurement device main body 3a, 3b Display unit 4 Input key 10 CPU 13 Memory

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-52722 (JP, A) JP-A-49-59668 (JP, A) JP-A-50-124595 (JP, A) JP-A 64-64 28704 (JP, A) Japanese Utility Model Sho 58-180453 (JP, U) JP-B 55-28331 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01L 5/00

Claims (2)

(57) [Claims] 1. A reference change amount setting device of a load change point detecting device for detecting a change point of a temporal change amount of a load, wherein a load data obtaining means for obtaining load data; A fluctuation amount calculating means for calculating a temporal fluctuation amount of data; a display means for displaying the temporal fluctuation amount calculated by the fluctuation amount calculating means; and a reference fluctuation amount based on the temporal fluctuation amount. A reference change amount setting device for a load change point detection device, comprising: setting means for setting the point change device. 2. A reference change amount setting device of a load change point detecting device for detecting a change point of a temporal change amount of a load, wherein a load data obtaining means for obtaining load data; A temporal change amount calculating means for calculating a temporal change amount of data; a temporary change point calculating means for calculating a temporary change point based on the temporal change amount; and the temporal change amount before and after the temporary change point. And a setting means for setting the reference change amount in the load change point detection device, the reference change amount setting device for a load change point detection device.