CN102744741B - Fixed length cut-off control - Google Patents

Abstract

The invention provides a kind of fixed length cut-off control, a motion controller is mainly provided to connect the servomechanism cutting unit, simultaneously, the encoder at the transmission mechanism place being arranged on feeding unit is also provided, in order to gather the speed parameter at above-mentioned position, and export and give processing module and carry out recording processing, and feed back to this motion controller, in addition, this motion controller also receives the controling parameters inputted by man-machine interface, by this motion controller according to the motion girth of cutting knife and the magnitude relationship by the cutoff length set by man-machine interface, control the movement locus of this feeding unit, to realize the object that fixed length cuts.

Description

Fixed length cut-off control

Technical field

The present invention relates to a kind of cable and cut field, particularly relate to a kind of fixed length cut-off control.

Background technology

Traditional material cuts the high-speed counting function mainly utilizing Programmable Logic Controller, the frequency signal of capturing and coding device and length, when length reaches, produce and interrupt, send out a pulse signal, the frequency of this pulse is exactly the frequency of capturing and coding device, controls the servo action of cutting knife.Because the action of each cutting knife is always delayed, tracking error is larger, and repeatable accuracy is poor, and error is difficult to control within 1mm.

Therefore, how to propose a kind of fixed length cut-off control, to solve the Length discrepancy disappearance occurred when material high-speed cuts, real is problem anxious to be resolved at present.

Summary of the invention

The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of fixed length cut-off control, to solve the problem occurring Length discrepancy when repetitive positioning accuracy difference causes material high-speed to cut.

For achieving the above object and other relevant objects, the invention provides a kind of fixed length cut-off control, it is applied in material cutting apparatus, this material cutting apparatus comprises feeding unit and cuts unit, it is characterized in that, this fixed length cut-off control comprises: man-machine interface, in order to provide the setting of controling parameters, wherein, this controling parameters at least comprises cutoff length, synchronization zone time span, encoder, is arranged on the transmission mechanism place of this feeding unit, and in order to gather the speed parameter of this feeding unit, processing module, connects this encoder, and in order to receive and to record the speed parameter that this encoder gathers, and motion controller, connect described man-machine interface respectively, described processing module and described in cut the servomechanism of unit, and prestore the motion diameter of cutting knife, and the motion diameter of cutting knife prestored in order to basis for estimation and the magnitude relationship of the motion girth of the cutting knife calculated and the cutoff length set by described man-machine interface, when this cutoff length equals the motion girth of this cutting knife, send the velocity amplitude identical with the speed parameter that this processing module records and cut the servomechanism of unit to this, and control this and cut unit by above-mentioned velocity amplitude and do uniform circular motion as linear velocity, when this cutoff length is greater than the motion girth of this cutting knife, according to set controling parameters, the motion diameter of this cutting knife and the speed parameter recorded, and collocation is according to the first computation rule, and obtain First Line acceleration, to cut in the cycle at one, before once cut after action completes, control this to cut unit and to reduce speed now from synchronization zone stopping by this First Line acceleration, after waiting for certain hour length, accelerated motion is done to synchronization zone again by this First Line acceleration, once cut namely completing after set synchronization zone setting-up time, when this cutoff length is less than the motion girth of this cutting knife, according to set controling parameters, the motion diameter of this cutting knife and the speed parameter recorded, and collocation is according to the second computation rule, and obtain the second linear acceleration, the time span in segment sync district and the time span of acceleration, to cut in the cycle at one, before once cut after action completes, control this cut unit synchronization zone move the segment sync district obtained time span after, accelerate from synchronization zone by this second linear acceleration again, when after the time span through obtained acceleration, control cuts unit and does retarded motion to synchronization zone by the second linear acceleration, then, namely complete after the time span in obtained segment sync district again and once cut.

In fixed length cut-off control of the present invention, when this cutoff length is greater than the motion girth of this cutting knife, this controling parameters also comprises the stopping stand-by period length cutting unit, and this first computation rule is:

$a1=\frac{\mathrm{\πD}-{\mathrm{\υ}}_0{t}_0}{\frac{1}{4}{(L/{\mathrm{\υ}}_0-t_0-t_1)}^2};$

Wherein, a1 represents First Line acceleration, and L represents cutoff length, and D represents the motion diameter of cutting knife, v ₀represent the speed parameter recorded, t ₀represent synchronization zone time span, t ₁represent the stopping stand-by period length cutting unit, π represents pi.This second computation rule is:

$\left\{\begin{array}{c}a2=\frac{\mathrm{\πD}-L}{\frac{1}{4}{(L/{\mathrm{\υ}}_0-t_0)}^2}\\ t2=\frac{1}{2}(L/{\mathrm{\υ}}_0-t_0)\\ t_0^1=\frac{1}{2}{t}_0\end{array}\right.;$

Wherein, a2 represents the second linear acceleration, and L represents cutoff length, and D represents the motion diameter of cutting knife, v ₀represent the speed parameter recorded, t ₀represent synchronization zone time span, t ₀ ¹represent the time span in segment sync district, t ₂represent the time span accelerated, π represents pi.

In addition, this processing module can be such as PLC.

As mentioned above, fixed length cut-off control of the present invention mainly provides a motion controller to connect the servomechanism cutting unit, simultaneously, the encoder at the transmission mechanism place being arranged on feeding unit is also provided, in order to gather the speed parameter at above-mentioned position, and export and give processing module and carry out recording processing, and feed back to this motion controller, in addition, this motion controller also receives the controling parameters inputted by man-machine interface, by this motion controller according to the motion girth of cutting knife and the magnitude relationship by the cutoff length set by man-machine interface, control the movement locus of this feeding unit, to avoid the drawback of repetitive positioning accuracy difference, and realize the object that fixed length cuts.

Accompanying drawing explanation

Fig. 1 is the structural representation being shown as fixed length cut-off control of the present invention.

Fig. 2 A and 2B is the rate curve schematic diagram that display one cuts cycle inner cutter, and wherein, Fig. 2 A represents the rate curve when cutoff length is greater than the motion girth of cutting knife, and Fig. 2 B represents the rate curve when cutoff length is less than the motion girth of cutting knife.

Element numbers explanation

10 man-machine interfaces

11 encoders

12 processing modules

13 motion controllers

2 servomechanisms cutting unit

T0 synchronization zone time span

The time span in T01, T02 segment sync district

T1, T3 acceleration/deceleration time span

T2 cuts the stopping stand-by period length of unit

V0 synchronization zone speed

Detailed description of the invention

Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this description can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by detailed description of the invention different in addition, and the every details in this description also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.

Refer to Fig. 1, it is the block schematic diagram showing fixed length cut-off control of the present invention, wherein, fixed length cut-off control of the present invention is applied in material cutting apparatus, this material cutting apparatus comprises feeding unit and cuts unit, as shown in Figure 1, fixed length cut-off control of the present invention comprises man-machine interface 10, encoder 11, processing module 12 and motion controller 13.Below Fig. 2 A and 2B is namely coordinated to be described in detail to fixed length cut-off control of the present invention.

As shown in Figure 1, this man-machine interface 10 is the settings providing controling parameters, wherein, this controling parameters at least comprises cutoff length, synchronization zone time span, when this motion controller 13(is detailed later) when judging that cutoff length is greater than the motion girth of this cutting knife, this controling parameters also comprises the stopping stand-by period length cutting unit.

This encoder 11 is arranged on transmission mechanism (not shown) place of this feeding unit, and in order to gather the speed parameter of this feeding unit.

This processing module 12 connects this encoder 11, and in order to receive and to record the speed parameter that this encoder 11 gathers.In the present embodiment, this processing module 12 is PLC.

This motion controller 13 connect respectively this man-machine interface 10, this processing module 12 and this cut the servomechanism 2 of unit, and prestore the motion diameter of cutting knife, and the motion diameter of cutting knife prestored in order to basis for estimation and the magnitude relationship of the motion girth of the cutting knife calculated and the cutoff length set by this man-machine interface 10.

When judging that cutoff length equals the motion girth of cutting knife, sending the velocity amplitude identical with the speed parameter that this processing module 12 records and cutting the servomechanism of unit to this, and control this and cut unit and do uniform circular motion by above-mentioned velocity amplitude as linear velocity.

When judging that cutoff length is greater than the motion girth of this cutting knife, according to motion diameter and the speed parameter that records of set controling parameters, cutting knife, and collocation is according to the first computation rule, and obtain First Line acceleration, to cut in the cycle at one, once cut after action completes front, control to cut unit and to reduce speed now from synchronization zone stopping by First Line acceleration, as shown in Figure 2 A, T is spent altogether ₁time, then, wait for certain dwell time length T ₂after, then do accelerated motion to synchronization zone by First Line acceleration, through set synchronization zone setting-up time T ₀after namely complete and once cut, the time span of accelerated motion equals the same time span cutting the retarded motion in cycle, is all T ₁, in addition, stop stand-by period length T ₂can, by the people of man-machine interface 10 for being set as zero, be not limited to shown in Fig. 2 A; Specifically, this First Line acceleration is according to set cutoff length and synchronization zone time span, the motion diameter of cutting knife that cuts the stopping stand-by period length of unit, the speed parameter recorded and prestore, collocation calculates according to the second computation rule again, wherein, this second computation rule is:

$a1=\frac{\mathrm{\πD}-{\mathrm{\υ}}_0{t}_0}{\frac{1}{4}{(L/{\mathrm{\υ}}_0-t_0-t_1)}^2};$

Wherein, a1 represents First Line acceleration, and L represents cutoff length, and D represents the motion diameter of cutting knife, v ₀represent the speed parameter (i.e. the speed parameter of feeding unit, the transfer rate of usual feeding unit is at the uniform velocity, therefore this speed parameter is synchronization zone speed) recorded, t ₀represent synchronization zone time span, t ₁represent the stopping stand-by period length cutting unit, π represents pi.

As shown in Figure 2 B, when judging that cutoff length is less than the motion girth of cutting knife, according to motion diameter and the speed parameter that records of set controling parameters, cutting knife, and collocation is according to the second computation rule, and obtains the time span T in the second linear acceleration, segment sync district ₀ ¹, T ₀ ²and the time span T accelerated ₃, to cut in the cycle at one, frontly once cut after action completes, cut unit described in control and to move in synchronization zone the time span T in the segment sync district obtained ₀ ¹after, then accelerate from synchronization zone by described second linear acceleration, as the time span T of the acceleration through obtaining ₃after, control to cut unit and do retarded motion to synchronization zone by the second linear acceleration, as shown in Figure 2 B, spend T altogether ₃time, then, then through the time span T in the segment sync district obtaining ₀ ²after namely complete and once cut, herein, the time span T in segment sync district ₀ ¹with T ₀ ²summation for by the synchronization zone time span set by man-machine interface 10; Specifically, this second linear acceleration is according to set cutoff length and synchronization zone time span, the speed parameter recorded and the motion diameter of cutting knife that prestores, collocation calculates according to the second computation rule again, and wherein, this second computation rule is:

$\left\{\begin{array}{c}a2=\frac{\mathrm{\πD}-L}{\frac{1}{4}{(L/{\mathrm{\υ}}_0-t_0)}^2}\\ t2=\frac{1}{2}(L/{\mathrm{\υ}}_0-t_0)\\ t_0^1=\frac{1}{2}{t}_0\end{array}\right.;$

Wherein, a2 represents the second linear acceleration, and L represents cutoff length, and D represents the motion diameter of cutting knife, v ₀represent the speed parameter recorded, t ₀represent synchronization zone time span, t ₀ ¹represent the time span in segment sync district, t ₂represent the time span accelerated, π represents pi, wherein, in above-mentioned second computation rule, is carry out calculating so that the time span in section segment sync district, 2 is as shown in Figure 2 B equal and obtains T ₀ ¹=T ₀ ², but not as limit, T ₀ ¹with T ₀ ²also can be unequal, if unequal, then can be set respectively by man-machine interface 10, as long as ensure T ₀ ¹with T ₀ ²summation for by the synchronization zone time span set by man-machine interface 10.

This motion controller 13 divides above-mentioned three kinds of situations to control cutting unit according to the motion girth of cutting knife and the magnitude relationship of cutoff length, to ensure that carrying out fixed length by the cutoff length of setting cuts.

In sum, fixed length cut-off control of the present invention mainly provides a motion controller to connect the servomechanism cutting unit, simultaneously, the encoder at the transmission mechanism place being arranged on feeding unit is also provided, in order to gather the speed parameter at above-mentioned position, and export and give processing module and carry out recording processing, and feed back to this motion controller, in addition, this motion controller also receives the controling parameters inputted by man-machine interface, by this motion controller according to the motion girth of cutting knife and the magnitude relationship by the cutoff length set by man-machine interface, control the movement locus of this feeding unit, to realize the object that fixed length cuts.

Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.

Claims (5)

1. a fixed length cut-off control, it is applied in material cutting apparatus, and described material cutting apparatus comprises feeding unit and cuts unit, it is characterized in that, described fixed length cut-off control comprises:

Man-machine interface, in order to provide the setting of controling parameters, wherein, described controling parameters at least comprises cutoff length, synchronization zone time span;

Encoder, is arranged on the transmission mechanism place of described feeding unit, and in order to gather the speed parameter of described feeding unit;

Processing module, connects described encoder, and in order to receive and to record the speed parameter that described encoder gathers; And

Motion controller, connect respectively described man-machine interface, described processing module and described in cut the servomechanism of unit, and prestore the motion diameter of cutting knife, and the motion diameter of cutting knife prestored in order to basis for estimation and the magnitude relationship of the motion girth of the cutting knife calculated and the cutoff length set by described man-machine interface

When described cutoff length equals the motion girth of described cutting knife, send the velocity amplitude identical with the speed parameter that described processing module records to described in cut the servomechanism of unit, and cut unit and do uniform circular motion by above-mentioned velocity amplitude as linear velocity described in controlling

When described cutoff length is greater than the motion girth of described cutting knife, according to set controling parameters, the motion diameter of described cutting knife and the speed parameter recorded, and collocation is according to the first computation rule, and obtain First Line acceleration, to cut in the cycle at one, before once cut after action completes, cut unit described in control to reduce speed now from synchronization zone stopping by described First Line acceleration, after waiting for certain hour length, accelerated motion is done to synchronization zone again by described First Line acceleration, once cut namely completing after set synchronization zone setting-up time,

When described cutoff length is less than the motion girth of described cutting knife, according to set controling parameters, the motion diameter of described cutting knife and the speed parameter recorded, and collocation is according to the second computation rule, and obtain the second linear acceleration, the time span in segment sync district and the time span of acceleration, to cut in the cycle at one, before once cut after action completes, cut described in control unit synchronization zone move the segment sync district obtained time span after, accelerate from synchronization zone by described second linear acceleration again, when after the time span through obtained acceleration, control cuts unit and does retarded motion to synchronization zone by the second linear acceleration, then, namely complete after the time span in obtained segment sync district again and once cut.

2. fixed length cut-off control according to claim 1, is characterized in that, when described cutoff length is greater than the motion girth of described cutting knife, described controling parameters also comprises the stopping stand-by period length cutting unit.

3. fixed length cut-off control according to claim 2, is characterized in that, described first computation rule is: wherein, a1 represents First Line acceleration, and L represents cutoff length, and D represents the motion diameter of cutting knife, v ₀represent the speed parameter recorded, t ₀represent synchronization zone time span, t ₁represent the stopping stand-by period length cutting unit, π represents pi.

4. fixed length cut-off control according to claim 1, is characterized in that, described second computation rule is: $\left\{\begin{array}{c}a2=\frac{\mathrm{\πD}-L}{\frac{1}{4}{(L/{\mathrm{\υ}}_0-t_0)}^2}\\ t2=\frac{1}{2}(L/{\mathrm{\υ}}_0-t_0)\\ t_0^1=\frac{1}{2}{t}_0\end{array}\right.,$ Wherein, a2 represents the second linear acceleration, and L represents cutoff length, and D represents the motion diameter of cutting knife, v ₀represent the speed parameter recorded, t ₀represent synchronization zone time span, t ₀ ¹represent the time span in segment sync district, t ₂represent the time span accelerated, π represents pi.

5. fixed length cut-off control according to claim 1, is characterized in that, described processing module is PLC.