WO2019128788A1

WO2019128788A1 - Power outage tracking method and system for die height indicator

Info

Publication number: WO2019128788A1
Application number: PCT/CN2018/121891
Authority: WO
Inventors: 韩松林; 邓国钊; 王兴志
Original assignee: 凯达威尔创新科技（深圳）有限公司
Priority date: 2017-12-29
Filing date: 2018-12-19
Publication date: 2019-07-04
Also published as: CN108176732B; CN108176732A; JP2021507815A; JP6887189B2

Abstract

A power outage tracking method for a die height indicator. The method comprises: before a power outage of a die height indicator, converting a rotation displacement angle of a transmission shaft into an electrical signal, and outputting the same to a computation processing module, wherein the computation processing module calculates a die height value of a punching machine according to the electrical signal; recording a first stop position of an encoder at the moment when a power outage of the die height indicator occurs; recording a second stop position of the encoder at the moment when the die height indicator regains power; determining, according to the first stop position and the second stop position of the encoder, an angular displacement direction of the encoder during the power outage; and calculating, according to a first angular displacement, a second angular displacement, and the angular displacement direction of the encoder, a third angular displacement c of the encoder during the power outage. Further provided is a power outage tracking system for a die height indicator. The method and the system track the displacement angle of the transmission shaft during the power outage, thereby eliminating an error caused by the angular displacement of the transmission shaft during the power outage, so as to accurately and precisely reflect the actual die height of the machine.

Description

Power-off tracking method and system for module height indicator

Technical field

The invention relates to the field of stamping machine tools, in particular to a power-off tracking method and system for a mold height indicator.

Background technique

A die height indicator is provided on the stamping machine to display the mold height and the mold height limit. The mold height indicator collects signals through the drive shaft, and the drive shaft is connected to the encoder. Therefore, the angular displacement of the drive shaft can be directly converted by the angular displacement of the encoder. When the module height indicator is used to sample the signal through the transmission shaft, the displacement angle of the transmission shaft is first converted into an electrical signal by the encoder, and then calculated into the mold height. If the machine is suddenly powered off, its drive shaft will still rotate at a certain angle under inertia. In addition, if there is no power supply, if the press machine vibrates due to external factors, it will cause angular displacement of the drive shaft. Since the existing mold height indicator cannot track the displacement angle of the drive shaft during the power failure, the accuracy of the sampled signal is affected, and the displayed mold height value does not match the actual situation.

Currently, the solution to this problem is to recalibrate the module height indicator. However, the calibration process is cumbersome and takes a long time, which seriously affects production efficiency.

Therefore, the prior art has yet to be improved and improved.

Summary of the invention

In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a method and system for power-off tracking of a module height indicator, which aims to solve the current display of the module height indicator in the event of power failure or vibration. The problem that the mold height value does not match the actual situation.

In order to achieve the above object, the present invention adopts the following technical solutions:

A power-off tracking method for a module height indicator includes the following steps:

Before the module height indicator is powered off, the encoder converts the displacement angle of the rotation of the transmission shaft into an electrical signal, and then outputs the signal to the arithmetic processing module, and the arithmetic processing module calculates the mold height value of the stamping machine tool according to the electrical signal;

At the moment when the module height indicator is powered off, the first stop position of the encoder at this time is recorded, and the first angular displacement of the first stop position of the encoder with respect to the preset initial position of the encoder in the clockwise direction is recorded as a. ;

At the moment when the module height indicator resumes power supply, the second stop position of the encoder is recorded at this time, and the second angular displacement of the second stop position of the encoder with respect to the preset initial position of the encoder in the clockwise direction is recorded as b. ;

Determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder;

The third angular displacement c of the encoder during the power down is calculated based on the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder.

In the power-off tracking method of the mold height indicator, the step of calculating the third angular displacement c of the encoder during the power-off according to the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder is further include:

According to the angular displacement direction of the encoder and the third angular displacement c and the mold height value of the machine at the moment of power failure, the value of the mold height at the moment when the machine resumes power supply is calculated.

In the power-off tracking method of the module height indicator, the determining the angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder specifically includes:

When a<b<a+180° or b<a-180°, it is judged that the encoder rotates clockwise;

When 0 < a - b < 180 ° or b > a + 180 °, it is judged that the encoder rotates counterclockwise.

In the power-off tracking method of the module height indicator, the calculating the third angular displacement c of the encoder during the power-off according to the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder specifically includes:

When the encoder rotates clockwise and a<b<a+180°, then the third angular displacement c=b-a is calculated;

When the encoder rotates clockwise and b < a-180 °, then calculate the third angular displacement c = b + 360 ° - a;

When the encoder rotates counterclockwise and 0 < a-b < 180 °, then calculate a third angular displacement c = a - b;

When the encoder rotates counterclockwise and b>a+180°, the third angular displacement c=360°-b+a is calculated.

In the power-off tracking method of the module height indicator, the encoder is an absolute encoder or an incremental encoder.

A power-off tracking system for a module height indicator, comprising:

An encoder, configured to convert the rotational displacement angle into an electrical signal, and then output the electrical signal to the arithmetic processing module;

An arithmetic processing module, configured to calculate a mold height value of the punching machine according to the electrical signal, and record the first stop position of the encoder at the moment when the mold height indicator is powered off, and the first stop position of the encoder The first angular displacement in the clockwise direction relative to the preset initial position of the encoder is denoted a; at the instant when the modular height indicator is restored, the second stop position of the encoder at this time is recorded and the second stop of the encoder is stopped a second angular displacement of the position in the clockwise direction relative to the preset initial position of the encoder is denoted by b; determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder; The first angular displacement, the second angular displacement, and the angular displacement direction of the encoder calculate a third angular displacement c of the encoder during power down.

In the power-off tracking system of the module height indicator, the operation processing module is further configured to:

In the power-off tracking system of the module height indicator, the operation processing module includes:

a first direction determining module, configured to determine that the encoder rotates clockwise when a<b<a+180° or b<a-180°;

The second direction determining module is configured to determine that the encoder rotates counterclockwise when 0<a-b<180° or b>a+180°.

In the power-off tracking system of the module height indicator, the operation processing module further includes:

a first angular displacement calculation module, configured to calculate a third angular displacement c=b-a when the encoder rotates clockwise and a<b<a+180°;

a second angular displacement calculation module, configured to calculate a third angular displacement c=b+360°-a when the encoder rotates clockwise and b<a-180°;

a triangular displacement calculation module, configured to calculate a third angular displacement c=a-b when the encoder rotates counterclockwise and 0<a-b<180°;

The fourth angular displacement calculation module is configured to calculate a third angular displacement c=360°-b+a when the encoder rotates counterclockwise and b>a+180°.

In the power-off tracking system of the module height indicator, the encoder is an absolute encoder or an incremental encoder.

Compared with the prior art, in the power-off tracking method and system of the mold height indicator provided by the present invention, the method includes converting the displacement angle of the rotation of the transmission shaft into an electrical signal before the power-off indicator is powered off, and then Output to the arithmetic processing module, the arithmetic processing module calculates the mold height value of the punching machine according to the electrical signal; when the mold height indicator is powered off, records the first stop position of the encoder at this time, and the first of the encoder The first angular displacement of the stop position in the clockwise direction relative to the preset initial position of the encoder is denoted as a; at the instant when the module height indicator is restored, the second stop position of the encoder at this time is recorded, and the encoder is a second angular displacement of the second stop position relative to the preset initial position of the encoder in the clockwise direction is recorded as b; determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder; The third angular displacement c of the encoder during the power down is calculated based on the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder. The invention determines the rotation direction of the encoder through the first stop position and the second stop position by recording the first stop position before the encoder is powered off and the second stop position after the encoder is powered off, and then calculating according to the rotation direction. The angular displacement of the encoder can track the displacement angle of the drive shaft during power failure, further eliminating the error caused by the angular displacement of the drive shaft after power failure, accurately and accurately reflecting the true mold height of the punching machine, avoiding the situation after starting the machine. The problem of wasted time and inefficiency caused by the need to recalibrate the die height indicator.

DRAWINGS

FIG. 1 is a flow chart of a power-off tracking method of a mold height indicator provided by the present invention.

FIG. 2 is a schematic diagram showing the rotation state of the first embodiment of the encoder in the power-off tracking method of the mold height indicator provided by the present invention.

FIG. 3 is a schematic diagram showing a rotation state of a second embodiment of the encoder in the power-off tracking method of the mold height indicator provided by the present invention.

4 is a schematic diagram showing a rotation state of a third embodiment of the encoder in the power-off tracking method of the mold height indicator provided by the present invention.

FIG. 5 is a schematic diagram showing a rotation state of a fourth embodiment of the encoder in the power-off tracking method of the mold height indicator provided by the present invention.

FIG. 6 is a structural block diagram of a power-off tracking system of a mold height indicator provided by the present invention.

Detailed ways

The present invention provides a power-off tracking method and system for a module height indicator. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1, a flow chart of a power-off tracking method for a module height indicator provided by the present invention includes the following steps:

Before the S100 and the module height indicator are powered off, the displacement angle of the rotation of the transmission shaft is converted into an electric signal, and then output to the arithmetic processing module, and the operation processing module calculates the mold height value of the stamping machine tool according to the electric signal.

Specifically, the encoder is used to convert the motion information of the drive shaft of the mold height indicator into the angular displacement of the rotation, and then convert the angular displacement of the rotation into an electrical signal and output it to the operation processing module, and the operation processing module according to the electrical signal Calculating the mold height value of the stamping machine, the electrical signal can reflect the displacement of the drive shaft, so that the mold height value of the stamping machine can be further calculated. Further, the encoder is an absolute encoder or increment. In the preferred embodiment, the electrical signal from the encoder is a digital signal, and the encoder rotates one revolution to generate 1024 signals. One revolution indicates that the stamping machine has a variation of the mold height value of 0.1 mm.

S200: recording, at the moment when the module height indicator is powered off, recording the first stop position of the encoder at this time, and recording the first stop position of the encoder in a clockwise direction with respect to the first angular displacement of the preset initial position of the encoder Make a.

In this embodiment, after the mold height indicator is powered off, due to the inertia of the drive shaft, it will continue to move, that is, the encoder will still rotate at a certain angle. In this inertia case, the angular displacement of the drive shaft is generally less than 180 degrees, that is, the rotation of the encoder is less than half a turn, and more specifically, the angular displacement of the drive shaft is generally less than 150 degrees, and the present invention is based on this The power-off tracking method provided by the present invention.

In particular, the encoder is pre-configured with an initial position, ie the absolute origin of the encoder. At the moment when the module height indicator is turned off, the stop position of the encoder at this time is recorded as the first stop position. Subsequent calculation of the rotation angle of the encoder according to the new stop position of the encoder, by recording the angular displacement of the first stop position and the absolute origin, and restoring the angular displacement of the second stop position of the encoder and the absolute origin at the moment of power supply, It is thus possible to calculate the angle of displacement of the encoder during a power outage.

S300. Recording the second stop position of the encoder at the moment when the module height indicator resumes power supply, and recording the second stop position of the encoder in the clockwise direction with respect to the second angular displacement of the preset initial position of the encoder Make b.

In this embodiment, when the module height indicator resumes power supply, the stop position of the encoder is recorded as the second stop position at this time, and is compared with the initial position of the preset encoder, that is, the absolute origin, and the record is recorded. The angular displacement of the stop position and the absolute origin further calculates the angle of rotation of the encoder.

In particular, the encoder is pre-configured with an initial position, ie the absolute origin of the encoder. When the module height indicator is powered off, the stop position of the encoder is recorded as the first stop position; at the moment of restoring the power supply, the stop position of the encoder is recorded as the second stop position; by recording the first stop position The angular displacement a with the absolute origin and the angular displacement b of the second stop position with the absolute origin, so that the displacement angle c of the encoder during the power-off can be calculated.

S400. Determine, according to the first stop position and the second stop position of the encoder, an angular displacement direction of the encoder during the power off period;

S500. Calculate a third angular displacement c of the encoder during the power-off according to the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder.

In this embodiment, the mode height indicator determines the angular displacement direction of the encoder according to the first stop position and the second stop position of the encoder. Since the inertial rotation of the drive shaft after power failure is generally not more than 180 degrees, that is, the rotation of the encoder is less than half a turn, it can be determined by determining whether the second stop position is rotated 180° clockwise at the first stop position. Between a stop position, it is determined whether the encoder is rotated clockwise, and whether the encoder is determined by determining whether the second stop position is rotated counterclockwise by 180° between the first stop position and the first stop position Anticlockwise rotation. Further, the rotation angle of the encoder is calculated according to the direction of rotation, where 0≤a<360°, 0≤b<360°, and 0≤c<180.

Specifically, the step S300 specifically includes:

When a<b<a+180° or b<a-180°, it is judged that the encoder rotates clockwise;

The step S400 specifically includes:

In order to better understand the present invention, the power-off tracking method of the present invention will be described in detail below with reference to FIGS. 2-5.

Referring to FIG. 2, in the first embodiment, the first angular displacement a of the encoder is between 0° and 180°, and the second angular displacement b is between a and a+180°, so the second stop position is Between the position where the first stop position is rotated 180° clockwise and the first stop position, it can be determined that the encoder rotates clockwise, thereby further calculating the third angular displacement c=ba, that is, the encoder rotates clockwise, and then The real-time mold height value of the encoder is calculated according to the angular displacement direction and the rotation angle of the encoder.

Referring to FIG. 3, in the second embodiment, the first angular displacement a of the encoder is between 0° and 180°, the second angular displacement b is between a+180° and 360°, and the second angular displacement is b. >a+180°, so the second stop position can be rotated counterclockwise by 180° between the first stop position and the first stop position, so it can be judged that the encoder rotates counterclockwise, thereby further calculating the third angle. The displacement c=360°-b+a, and then calculate the real-time mold height value of the encoder according to the rotation direction and angular displacement angle of the encoder.

Referring to FIG. 4, in the third embodiment, the first angular displacement a of the encoder is between 0° and 180°, and the second angular displacement b is between 0° and a, where 0<ab<180°. Therefore, the second stop position is between the position after the 180° counterclockwise rotation of the first stop position and the first stop position, so it can be determined that the encoder rotates counterclockwise, thereby further calculating the third angular displacement c=ab, and then according to The angular displacement direction and the rotation angle of the encoder calculate the real-time mold height value of the encoder.

Referring to FIG. 5, in the fourth embodiment, the first angular displacement a of the encoder is between 180° and 360°, and the second angular displacement b is between 0° and a-180°, so b<a- 180°, so the second stop position is between the position after the 180° clockwise rotation of the first stop position and the first stop position, so that the encoder can be judged to rotate clockwise, thereby further calculating the third angular displacement c=b +360°-a, and then calculate the real-time mold height of the encoder according to the angular displacement direction and rotation angle of the encoder.

It can be seen from the above embodiment that when the encoder rotates clockwise or counterclockwise, by comparing the second angular displacement with the first angular displacement, the rotation direction of the encoder can be determined, and further according to the rotation direction. Calculate the rotation angle of the encoder, track the displacement angle of the drive shaft during power failure, and then correct the displayed mold height value according to the displacement angle of the drive shaft after restoring power supply, further eliminating the angular displacement caused by the drive shaft after power failure. The error accurately and accurately reflects the true mold height of the stamping machine, avoiding the problem of wasted time and low work efficiency caused by the need to recalibrate the mold height indicator after power on.

In a further embodiment, after the step S500, the method further includes:

According to the angular displacement direction of the encoder and the third angular displacement c and the mold height value of the machine tool at the moment of power failure, the actual mold height value at the moment when the machine tool resumes power supply is calculated.

By calculating the rotation angle of the encoder as the angular displacement information of the transmission shaft, and according to the angular displacement direction of the encoder, by using the value of the clamping height of the punching machine at the moment of power-off, plus or minus the displacement of the transmission shaft, Calculate the value of the mold height at the moment when the stamping machine resumes power supply, so that the mold height indicator can accurately display the accurate mold height value in case of power failure or vibration.

Based on the power-off tracking method of the above-mentioned module height indicator, the present invention further provides a power-off tracking system of the module height indicator. Referring to FIG. 6, the system includes:

The encoder 10 is configured to convert the rotational displacement angle into an electrical signal, and then output the electrical signal to the arithmetic processing module;

The operation processing module 20 is configured to calculate a mold height value of the punching machine according to the electrical signal, and record the first stop position of the encoder at the moment when the mold height indicator is powered off, and stop the first stop of the encoder The first angular displacement of the position in the clockwise direction relative to the preset initial position of the encoder is denoted a; at the instant when the modular height indicator is restored, the second stop position of the encoder at this time is recorded, and the encoder is second a second angular displacement of the stop position in the clockwise direction relative to the preset initial position of the encoder is denoted by b; determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder; The third angular displacement c of the encoder during the power down is calculated based on the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder.

Further, the operation processing module 20 is further configured to calculate a mold height value at the moment when the punching machine resumes power supply according to the rotation direction of the encoder and the third angular displacement c and the mold height value of the punching machine at the moment of power failure.

Further, the operation processing module 20 includes:

Further, the operation processing module 20 further includes:

Specifically, the encoder is an absolute encoder or an incremental encoder.

Since the power-off tracking method of the module height indicator has been described in detail above, it will not be described here.

In summary, in the power-off tracking method and system of the module height indicator provided by the present invention, the method includes converting the displacement angle of the rotation of the transmission shaft into an electrical signal before the module height indicator is powered off, and then outputting to The arithmetic processing module calculates the mold height value of the punching machine tool according to the electrical signal by the arithmetic processing module; records the first stop position of the encoder at the moment when the module height indicator is powered off, and sets the first stop position of the encoder The first angular displacement in the clockwise direction relative to the preset initial position of the encoder is denoted a; at the instant when the modular height indicator is restored, the second stop position of the encoder at this time is recorded and the second stop of the encoder is stopped a second angular displacement of the position in the clockwise direction relative to the preset initial position of the encoder is denoted by b; determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder; The angular displacement, the second angular displacement, and the angular displacement direction of the encoder calculate the third angular displacement c of the encoder during power down. The invention determines the rotation direction of the encoder through the first stop position and the second stop position by recording the first stop position before the encoder is powered off and the second stop position after the encoder is powered off, and then calculating according to the rotation direction. The angular displacement of the encoder can track the displacement angle of the drive shaft during power failure, further eliminating the error caused by the angular displacement of the drive shaft after power failure, accurately and accurately reflecting the true mold height of the punching machine, avoiding the situation after starting the machine. The problem of wasted time and inefficiency caused by the need to recalibrate the die height indicator.

It is to be understood that those skilled in the art can make equivalent substitutions or changes to the inventions and the inventions of the present invention, and all such changes or substitutions fall within the scope of the appended claims.

Claims

A power-off tracking method for a module height indicator, comprising the steps of:

Before the die height indicator is powered off, the displacement angle of the rotation of the drive shaft is converted into an electrical signal, and then output to the arithmetic processing module, and the operation processing module calculates the mold height value of the punching machine tool according to the electrical signal;

At the moment when the module height indicator is powered off, the first stop position of the encoder at this time is recorded, and the first angular displacement of the first stop position of the encoder with respect to the preset initial position of the encoder in the clockwise direction is recorded as a. ;

At the moment when the module height indicator resumes power supply, the second stop position of the encoder is recorded at this time, and the second angular displacement of the second stop position of the encoder with respect to the preset initial position of the encoder in the clockwise direction is recorded as b. ;

Determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder;

The third angular displacement c of the encoder during the power down is calculated based on the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder.
The power-off tracking method of a module height indicator according to claim 1, wherein said calculating a third angle of the encoder during power-off according to the first angular displacement, the second angular displacement, and the rotation direction of the encoder The step of shifting c further includes:

According to the angular displacement direction of the encoder and the third angular displacement c and the mold height value of the machine at the moment of power failure, the value of the mold height at the moment when the machine resumes power supply is calculated.
The power-off tracking method of the module height indicator according to claim 2, wherein the determining the angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder comprises:

When a<b<a+180° or b<a-180°, it is judged that the encoder rotates clockwise;

When 0°<a-b<180° or b>a+180°, it is judged that the encoder rotates counterclockwise.
The power-off tracking method of the module height indicator according to claim 3, wherein the calculating the encoder during the power-off period according to the first angular displacement, the second angular displacement, and the angular displacement direction of the encoder The triangular displacement c specifically includes:

When the encoder rotates clockwise and a<b<a+180°, then the third angular displacement c=b-a is calculated;

When the encoder rotates clockwise and b < a-180 °, then calculate the third angular displacement c = b + 360 ° - a;

When the encoder rotates counterclockwise and 0°<a-b<180°, then calculate a third angular displacement c=a-b;

When the encoder rotates counterclockwise and b>a+180°, the third angular displacement c=360°-b+a is calculated.
A power-off tracking method for a module height indicator according to any one of claims 1 to 4, wherein the encoder is an absolute encoder or an incremental encoder.
A power-off tracking system for a module height indicator, comprising:

An encoder, configured to convert the rotational displacement angle into an electrical signal, and then output the electrical signal to the arithmetic processing module;

An arithmetic processing module, configured to calculate a mold height value of the punching machine according to the electrical signal, and record the first stop position of the encoder at the moment when the mold height indicator is powered off, and the first stop position of the encoder The first angular displacement in the clockwise direction relative to the preset initial position of the encoder is denoted a; at the instant when the modular height indicator is restored, the second stop position of the encoder at this time is recorded and the second stop of the encoder is stopped a second angular displacement of the position in the clockwise direction relative to the preset initial position of the encoder is denoted by b; determining an angular displacement direction of the encoder during the power-off according to the first stop position and the second stop position of the encoder; The first angular displacement, the second angular displacement, and the angular displacement direction of the encoder calculate a third angular displacement c of the encoder during power down.
The power-off tracking system of the module height indicator according to claim 6, wherein the operation processing module is further configured to:

According to the angular displacement direction of the encoder and the third angular displacement c and the mold height value of the machine at the moment of power failure, the value of the mold height at the moment when the machine resumes power supply is calculated.
The power-off tracking system of the module height indicator according to claim 7, wherein the operation processing module comprises:

a first direction determining module, configured to determine that the encoder rotates clockwise when a<b<a+180° or b<a-180°;

The second direction determining module is configured to determine that the encoder rotates counterclockwise when 0<a-b<180° or b>a+180°.
The power-off tracking system of the module height indicator according to claim 8, wherein the operation processing module further comprises:

a first angular displacement calculation module, configured to calculate a third angular displacement c=b-a when the encoder rotates clockwise and a<b<a+180°;

a second angular displacement calculation module, configured to calculate a third angular displacement c=b+360°-a when the encoder rotates clockwise and b<a-180°;

a triangular displacement calculation module, configured to calculate a third angular displacement c=a-b when the encoder rotates counterclockwise and 0<a-b<180°;

The fourth angular displacement calculation module is configured to calculate a third angular displacement c=360°-b+a when the encoder rotates counterclockwise and b>a+180°.
A power-off tracking system for a modular height indicator according to any one of claims 6-9, wherein the encoder is an absolute encoder or an incremental encoder.