CN104140008A - Opposite-pressing roller synchronization detecting device, system and method - Google Patents

Abstract

The invention discloses an opposite-pressing roller synchronization detecting device, system and method. The detecting device comprises a first absolute value shaft encoder, a second absolute value shaft encoder and a PLC, wherein the first absolute value shaft encoder is installed on a driving roller, the second absolute value shaft encoder is installed on a pressing roller, phase position signals generated by the driving roller and phase position signals generated by the pressing roller are respectively transmitted to the PLC, the time interval for outputting every two adjacent phase position signals is calculated by the PLC according to the received phase position signals, the speed deviation ratio is calculated according to the calculated time, whether the speed deviation ratio goes beyond an allowable value or not is judged, and if yes, it is determined that opposite-pressing rollers are not synchronous in speed. Whether the opposite-pressing rollers are synchronous or not can be automatically detected through the detecting device.

Description

Device, system and method for synchronously detecting opposite compression rollers

Technical Field

The invention relates to the field of tobacco automatic control, in particular to a device, a system and a method for synchronously detecting a pressing roller.

Background

In the prior art, a cigarette making machine carries out bobbin paper conveying on a compression roller. Fig. 1 is a schematic view showing a counter-pressure roller feeding bobbin in the related art. As shown in fig. 1, the cigarette making machine conveys the bobbin 101 by a counter pressure roller including a drive roller 102 and a pinch roller 103, the drive roller 102 being rotated in a clockwise direction by a motor (not shown in fig. 1) of the rear body; the pinch roller 103 is tightly pressed on the driving roller 102 under the action of a cylinder (not shown in figure 1) of the back body, and the pinch roller 103 follows the driving roller 102 to run under the action of friction force between the driving roller 102 and the pinch roller 103; the bobbin 101 passes through between the driving roller 102 and the pinch roller 103, and the driving roller 102 and the pinch roller 103 drive the bobbin 101 to run together, so that the bobbin is conveyed.

In the prior art, the asynchronous fault of the press roller often occurs. For example, insufficient pressure between the driving roller 102 and the pinch roller 103 or damage to bearings inside the pinch roller 103 may cause the linear speed of the operation of the pinch roller 103 to lag behind that of the driving roller 102, at this time, the transportation of the bobbin paper is unstable, the quality of cigarette production may be affected, and the bobbin paper may be broken frequently seriously, which reduces the operation efficiency of the cigarette making machine.

Disclosure of Invention

The technical problem solved by the invention is as follows: whether the counter pressure rollers are synchronous or not is automatically detected.

According to a first aspect of the present invention, there is provided a counter pressure roller synchronization detecting apparatus including:

the first absolute value shaft encoder is arranged on the driving roller and used for transmitting a phase signal of the rotation of the driving roller to the PLC;

the second absolute value shaft encoder is arranged on the pressure roller and used for transmitting a phase signal of the rotation of the pressure roller to the PLC, wherein the counter pressure roller comprises a driving roller and a pressure roller;

a PLC for receiving phase signals generated by the rotation of the driving roller from the first absolute shaft encoder and detecting the time T elapsed from the rotation of the driving roller from one phase to the next adjacent phase; for receiving phase signals generated by rotation of the pressure roller from the second absolute value shaft encoder and detecting the time t elapsed from one phase to the next adjacent phase of the pressure roller; calculating a speed deviation rate E according to the time T and the time T, and judging whether the speed deviation rate exceeds an allowable value or not; if so, it is determined that the pair of roll speeds are not synchronized.

Further, still include: a calibration start button for generating a pulse signal and transmitting the pulse signal to the PLC;

calculating the time T when the PLC receives one pulse signal_iAnd time t_iAnd calculates the speed deviation ratio E:

<math> <mrow> <mi>E</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mi>T</mi> <mrow> <mi>t</mi> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> <mo>|</mo> </mrow> </math>

wherein:

<math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> </math>

wherein d is_i＝T_i/t_iC is an integer, and C is not less than 1.

Further, the method comprises the following steps: the PLC itself includes a first timer and a second timer,

the PLC triggers the first timer to start timing when receiving a phase signal generated by rotation of the driving roller, and triggers the first timer to stop timing when receiving an adjacent next phase signal generated by rotation of the driving roller, wherein the time elapsed from the start of timing to the stop of timing is time T; the PLC triggers the second timer to start timing when receiving a phase signal generated by rotation of the pressing roller, and triggers the second timer to stop timing when receiving an adjacent next phase signal generated by rotation of the pressing roller, wherein the time elapsed from the start of timing to the stop of timing is time t.

Further, still include:

the first timer is used for receiving a first timing starting signal of the PLC and starting timing; receiving a first stop timing signal of the PLC, stopping timing, and transmitting the time T from the start of timing to the stop of timing to the PLC;

the second timer is used for receiving a second timing starting signal of the PLC and starting timing; receiving a second stop timing signal of the PLC, stopping timing, and transmitting the time t from the start of timing to the stop of timing to the PLC;

wherein the PLC transmits the first timing start signal to the first timer when receiving a phase signal generated by rotation of the driving roller; when receiving an adjacent next phase signal generated by rotation of the driving roller, sending the first stop timing signal to the first timer; when receiving a phase signal generated by the rotation of the pressure roller, sending a second timing starting signal to the second timer; and when receiving the next adjacent phase signal generated by the rotation of the pressure roller, sending the second stop timing signal to the second timer, and receiving the time T transmitted by the first timer and the time T transmitted by the second timer.

Further, the calibration start button is a non-self-locking button.

Further, the method comprises the following steps: and if the PLC determines that the speeds of the pair of compression rollers are asynchronous, outputting a stop electric signal to the PLC of the cigarette making machine to stop the operation of the cigarette making machine.

Further, still include:

the alarm device is used for receiving an alarm electric signal from the PLC and giving an alarm; and/or

The display equipment is used for receiving a display electric signal from the PLC and displaying the information that the speed of the pair of compression rollers is not synchronous;

and if the PLC determines that the speeds of the pair of compression rollers are asynchronous, outputting an alarm electric signal to the alarm device and/or outputting a display electric signal to the display device.

Further, the method comprises the following steps: the alarm device comprises an alarm indicator lamp and/or a buzzer; the display device is a display.

Further, still include: and the stop start button is used for triggering the PLC to output an alarm electric signal to the alarm device, outputting a display electric signal to the display device and/or outputting a stop electric signal to the cigarette machine PLC.

Further, the stop starting button is a self-locking button.

According to a second aspect of the present invention, there is provided a counter roll synchronization detecting system, comprising: the pair of pressing roller synchronous detection device and the cigarette making machine are as described above, wherein the cigarette making machine comprises a driving roller, a pressing roller and a cigarette making machine stop button.

According to a third aspect of the present invention, there is provided a method for detecting synchronization of a pair of press rollers, comprising:

detecting a time T elapsed from the rotation of the drive roller from one phase to the next adjacent phase;

detecting the time t elapsed from the rotation of the pressure roller from one phase to the next adjacent phase, wherein the pair of pressure rollers comprises a driving roller and a pressure roller;

calculating a speed deviation rate E according to the time T and the time T;

judging whether the speed deviation rate exceeds an allowable value or not; if so, it is determined that the pair of roll speeds are not synchronized.

Further, a speed deviation ratio E is calculated:

<math> <mrow> <mrow> <mi>E</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mi>T</mi> <mrow> <mi>t</mi> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> <mo>|</mo> </mrow> <mo>,</mo> </mrow> </math> wherein:

<math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> </math>

wherein d is_i＝T_i/t_iC is an integer, and C is not less than 1.

Further, if the fact that the pressing roller speeds are not synchronous is determined, alarming is carried out, and/or information of the fact that the pressing roller speeds are not synchronous is displayed.

Further, if the speeds of the pair of compression rollers are determined to be asynchronous, the cigarette making machine is stopped.

In the invention, absolute value shaft encoders are respectively arranged on the driving roller and the pinch roller, phase signals generated by the rotation of the driving roller and the pinch roller are transmitted to the PLC, the PLC respectively calculates the time for outputting two adjacent phase signals according to the received phase signals, calculates the speed deviation rate according to the calculated time, and judges whether the speed deviation rate exceeds an allowable value, if so, the asynchronous speed of the compression roller is determined. The invention realizes the automatic detection of whether the press rollers are synchronous or not.

Furthermore, the effects of reminding operators and preventing bobbin paper from being broken are achieved by determining the operations of alarming, stopping and the like after the compression roller speed is asynchronous, and therefore production efficiency is improved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

The invention will be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a schematic view showing a counter-pressure roller feeding bobbin in the related art.

Fig. 2A is a schematic diagram showing a prior art absolute value shaft encoder.

Fig. 2B is a schematic diagram showing an output signal of a prior art absolute value shaft encoder.

FIG. 3 is a schematic diagram illustrating electrical connections to a nip roller synchronization detection apparatus according to some embodiments of the present invention.

Fig. 4 is a diagram showing a velocity deviation ratio calculation model according to an embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a first absolute value shaft encoder output signal according to an embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating a second absolute value shaft encoder output signal according to an embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating electrical connections to a nip roller synchronization detection apparatus according to some embodiments of the present invention.

FIG. 8 is a flow chart illustrating a method of detecting synchronization to a nip roller according to some embodiments of the present invention.

FIG. 9 is a flowchart illustrating a method of detecting synchronization to a platen according to further embodiments of the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

FIG. 3 is a schematic diagram illustrating electrical connections to a nip roller synchronization detection apparatus according to some embodiments of the present invention. As shown in fig. 3, the counter roller synchronization detecting apparatus 300 includes: a first absolute value shaft encoder 311, a second absolute value shaft encoder 312, and a PLC (Programmable Logic Controller) 313, and the counter pressure roller includes a driving roller and a pressure roller. Wherein,

fig. 2A is a schematic diagram showing a prior art absolute value shaft encoder. As shown in fig. 2A, the signal terminal 204 outputs 2 uniformly for every rotation of the rotating shaft 202 of the absolute value shaft encoder 200ⁿA digital signal-0, 1, 2 … … 2ⁿ1, each digital signal corresponds to the position of the rotating shaft 202. Fig. 2B is a schematic diagram showing an output signal of a prior art absolute value shaft encoder. Wherein the abscissa represents the position of the rotating shaft and the ordinate represents the output signal of the absolute value shaft encoder, and it can be seen from fig. 2B that the output signal of the absolute value shaft encoder varies with the position of the rotating shaft periodically.

The first absolute value shaft encoder 311 is installed on the driving roller, for example, an N-bit absolute value shaft encoder is installed in the driving roller, the absolute value shaft encoder operates for one period every time the driving roller rotates, the position of the rotating shaft of the driving roller corresponds to the phase signal of the first absolute value shaft encoder 311, and the absolute value shaft encoder transmits the phase signal of the rotation of the driving roller to the PLC 313.

The second absolute value shaft encoder 312 is installed on the pressure roller, for example, an n-bit absolute value shaft encoder is installed in the pressure roller, the absolute value shaft encoder operates for one cycle with the pressure roller every time the pressure roller rotates, the position of the rotating shaft of the pressure roller corresponds to the phase signal of the second absolute value shaft encoder 312, and the absolute value shaft encoder transmits the phase signal of the rotation of the pressure roller to the PLC 313.

The PLC313 is configured to receive a phase signal generated by rotation of the driving roller from the first absolute shaft encoder 311, and detect a time T elapsed from the rotation of the driving roller from one phase to an adjacent next phase; for receiving the phase signal generated by the rotation of the pressure roller from the second absolute value shaft encoder 312, and detecting the time t elapsed from the rotation of the pressure roller from one phase to the next adjacent phase; calculating a speed deviation rate E according to the time T and the time T, and judging whether the speed deviation rate exceeds an allowable value or not; if so, it is determined that the pair of roll speeds are not synchronized.

In the embodiment, absolute value shaft encoders are respectively installed on the driving roller and the pinch roller, phase signals generated by rotation of the driving roller and the pinch roller are transmitted to the PLC, the PLC respectively calculates the time for outputting two adjacent phase signals according to the received phase signals, calculates the speed deviation rate according to the calculated time, judges whether the speed deviation rate exceeds an allowable value, and if so, determines that the speed of the compression roller is not synchronous. Thus, an automatic detection of whether the press rolls are synchronized or not is achieved.

In an embodiment of the present invention, the pair of pressing roller synchronization detecting apparatus further includes: a calibration initiation button to generate a pulse signal and transmit the pulse signal to the PLC. Each time the PLC receivesA pulse signal, then calculating the time T_iAnd time t_iAnd calculates the speed deviation ratio E:

<math> <mrow> <mi>E</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mi>T</mi> <mrow> <mi>t</mi> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> <mo>|</mo> </mrow> </math>

wherein:

<math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> </math>

wherein d is_i＝T_i/t_iWherein C is an integer and is more than or equal to 1. That is, the calibration start button generates C pulse signals, the PLC obtains C d values, that is, d₁、d₂、…d_cAnd calculating to obtain an average value

For example, the calibration start button may be a non-self-locking button, and when the non-self-locking button is pressed down, the normally open contact is closed, and when the non-self-locking button is released, the button is restored to the original state, that is, the normally open contact is reopened, so that a pulse signal is generated every time the button is pressed down and released. The non-self-locking button is utilized, so that the use is simple and convenient, and the cost is lower. Of course, other types of buttons may be utilized with the present invention, and the scope of the present invention is not limited in this respect.

The derivation of the relation concerning the calculation of the speed deviation ratio E is described in detail below, and the procedure is as follows:

1) instantaneous linear velocity v of the drive roller₁Derivation process

Fig. 4 is a diagram showing a velocity deviation ratio calculation model according to an embodiment of the present invention. As shown in fig. 4, the circle a represents a driving roller having a radius R, and a first absolute value shaft encoder, such as an N-bit absolute value shaft encoder, is installed on the driving roller a, and operates for one period every time the driving roller a rotates, and uniformly outputs 2^NA digital signal-0, 1, 2 … … 2^N-1。

A₁And A₂Two adjacent phases of the first absolute value shaft encoder output representing rotation of the drive rollerSignal, drive roller from phase A₁Run to phase A₂The elapsed time is T (as shown in FIG. 5), during which the drive roller has operated 1/2^NLoop having an operating phase angle α of 2 π/2^NThus, the average angular velocity ω at which the drive roller is operated during this process can be found₁Comprises the following steps:

<math> <mrow> <msub> <mi>&omega;</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mi>&alpha;</mi> <mi>T</mi> </mfrac> <mo>=</mo> <mfrac> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <msup> <mn>2</mn> <mi>N</mi> </msup> </mfrac> <mi>T</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mrow> <msup> <mn>2</mn> <mi>N</mi> </msup> <mi>T</mi> </mrow> </mfrac> </mrow> </math>

the average linear velocity v of the drive roller running during this process₁Is composed of

<math> <mrow> <msub> <mi>v</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>&omega;</mi> <mn>1</mn> </msub> <mi>R</mi> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;R</mi> </mrow> <mrow> <msup> <mn>2</mn> <mi>N</mi> </msup> <mi>T</mi> </mrow> </mfrac> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </math>

The larger N is, the larger A₁The closer to A₂Then the above-mentioned average linear velocity v can be set₁Which is considered to be the instantaneous linear velocity of the drive roller.

2) Instantaneous linear velocity v of the pressure roller₂Derivation process

As shown in fig. 4, circle B represents a pressure roller having a radius r, and a second absolute value shaft encoder, for example, an n-bit absolute value shaft encoder, is provided on the pressure roller, and operates for one cycle every time the pressure roller rotates, and outputs 2 uniformlyⁿA digital signal-0, 1, 2 … … 2ⁿ-1。

B₁And B₂Representing two adjacent phase signals output by a second absolute value shaft encoder when the pressure roller is rotating, the pressure roller being driven from phase B₁Run to phase B₂The elapsed time is t (as shown in fig. 6), during which the pinch roller has operated 1/2ⁿLoop having a phase angle of operation β 2 π/2ⁿThus, the average angular velocity ω at which the nip roller runs during this process can be obtained₂Comprises the following steps:

<math> <mrow> <msub> <mi>&omega;</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mi>&beta;</mi> <mi>T</mi> </mfrac> <mo>=</mo> <mfrac> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <msup> <mn>2</mn> <mi>n</mi> </msup> </mfrac> <mi>T</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mrow> <msup> <mn>2</mn> <mi>n</mi> </msup> <mi>T</mi> </mrow> </mfrac> </mrow> </math>

the average linear velocity v at which the pinch roller B operates during this process₂Is composed of

<math> <mrow> <msub> <mi>v</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>&omega;</mi> <mn>2</mn> </msub> <mi>r</mi> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;r</mi> </mrow> <mrow> <msup> <mn>2</mn> <mi>n</mi> </msup> <mi>t</mi> </mrow> </mfrac> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </math>

The larger n is, the larger B₁The closer to B₂Then the above-mentioned average linear velocity v can be set₂Which is considered to be the instantaneous linear velocity of the pinch roller.

3) Velocity deviation ratio E derivation process

The linear speed ratio of the pinch roller to the drive roller can be derived from equations (1) and (2) as:

$\frac{v_2}{v_1}=\frac{T}{t}\frac{r}{R}{2}^{N-n}$

order:

$D=\frac{T}{t}...\left(3\right)$

$d=\frac{1}{\frac{r}{R}{2}^{N-n}}=\frac{R}{r}{2}^{n-N}...\left(4\right)$

thus, we obtain:

$\frac{v_2}{v_1}=\frac{D}{d}...\left(5\right)$

when the drive and pinch rollers are in synchronous operation, i.e. v₁＝v₂When the temperature of the water is higher than the set temperature,

$d=D=\frac{T}{t}...\left(6\right)$

as can be seen from equation (4): when R, R, N, N are fixed, d is also a fixed value.

As can be seen from equation (6): d is D when the drive roller and the pressure roller are operated synchronously, i.e., D can also be determined by equation (6) in the synchronous operation state.

Defining the speed deviation ratio E as:

$E=\frac{|v_2-v_1|}{v_1}...\left(7\right)$

combining equations (5) and (3) yields:

$E=\frac{|v_2-v_1|}{v_1}=|\frac{v_2}{v_1}-1|=|\frac{D}{d}-1|=|\frac{\frac{T}{t}}{d}-1|=|\frac{T}{\mathrm{td}}-1|...\left(8\right)$

e is more than or equal to 0 and less than or equal to 1, the smaller E is, the higher the synchronous operation degree of the driving roller and the pressure roller is, for example, when E is 0, v is₁＝v₂At the moment, the driving roller and the pressing roller are in a completely synchronous state; conversely, the larger E is, the lower the synchronization degree of the driving roller and the pinch roller is, for example, when E is 1, v₂When the pressure roller does not follow the drive roller at all, the value is 0. Wherein, the meaning of each parameter in the formula (8) is as follows:

e is the speed deviation rate; t is drive roller operation 1/2^NThe time elapsed for the cycle is also the time elapsed for the first absolute value shaft encoder to output two adjacent phase signals; t is pinch roller operation 1/2ⁿThe time elapsed for one cycle is also the time elapsed for the second absolute value shaft encoder to output two adjacent phase signals; d drive roll operation 1/2 when drive roll and pinch roll are run in synchronism^NTime T elapsed from cycle and pinch roller operation 1/2ⁿThe ratio of the time T elapsed for a period, i.e. d ═ T/T, (v)₁＝v₂). Where d is the mean valueThat is, the relationship for calculating the speed deviation rate E more accurately.

Up to this point, the derivation process of the relation concerning the calculation of the speed deviation rate E is described in detail.

In order to make the calculation of the speed deviation rate E more accurate, d in the formula (8) needs to be calibrated to obtain an average value thereofFor example, the times T and T may be detected a plurality of times, in the case where it is determined that the rollers are operated synchronouslyObtaining a plurality of d values according to the formula d-T/T, then calculating the average value of d, and averaging the average valueAnd the automatic detection result is stored in the PLC and is used for automatically detecting whether the compression rollers synchronously run or not. Of course, the average value may be realigned before detecting whether the pair of press rolls are synchronously operatedAnd (6) carrying out calibration. This is advantageous for obtaining a more accurate speed deviation ratio E.

In an embodiment of the present invention, the PLC313 itself may include a first timer and a second timer. Wherein the PLC313 receives a phase signal A generated by the rotation of the driving roller₁When the PLC receives the next adjacent phase signal A generated by the rotation of the driving roller, the first timer is triggered to start timing₂Triggering the first timer to stop timing, wherein the time elapsed from the start of timing to the stop of timing of the first timer is time T; the PLC313 receives a phase signal B generated by the rotation of the pressure roller₁When the time is up, the second timer is triggered to start timing, and the PLC receives the next adjacent phase signal B generated by the rotation of the compression roller₂And triggering the second timer to stop timing, wherein the time elapsed from the start of timing to the stop of timing of the second timer is time t. The PLC timer is used for timing, so that the effects of high precision and good program matching degree can be achieved.

Of course, the PLC313 may not use its own timer, but connect two timers externally, that is, the roll synchronization detecting apparatus 300 further includes: and the first timer and the second timer are respectively connected with the PLC. The first timer is used for receiving a first timing starting signal of the PLC and starting timing; receiving a first stop timing signal of the PLC, stopping timing, and transmitting the time T from the start of timing to the stop of timing to the PLC; a second timer for receiving a second start timing signal of the PLC andstarting timing; receiving a second stop timing signal of the PLC, stopping timing, and sending the time T from the start of timing to the stop of timing to the PLC so that the PLC calculates a speed deviation rate E according to the time T and the time T; wherein the PLC receives a phase signal A generated by the rotation of the driving roller₁When the first timer is started, a first timing starting signal is sent to the first timer; when receiving the next adjacent phase signal A generated by the rotation of the driving roller₂When the first timer is started, a first timing stopping signal is sent to the first timer; when receiving a phase signal B generated by the rotation of the pressure roller₁Then, sending a second timing starting signal to a second timer; and when receiving the next adjacent phase signal generated by the rotation of the pressure roller, sending a second stop timing signal to the second timer.

In an embodiment of the present invention, the pair of pressing roller synchronization detecting means includes: and if the PLC determines that the compression roller speeds are asynchronous, outputting a stop electric signal to the PLC of the cigarette making machine to stop the operation of the cigarette making machine. The bobbin paper is prevented from breaking by stopping the operation of the cigarette making machine.

In an embodiment of the present invention, the pair of pressing roller synchronization detecting apparatus further includes: an alarm device (e.g. an alarm indicator light and/or a buzzer) and/or a display device (e.g. a display). The alarm device is used for receiving an alarm electric signal from the PLC and giving an alarm (such as an alarm indicator lamp and/or a buzzer sounds); the display equipment is used for receiving a display electric signal from the PLC and displaying the information of the asynchronous speed of the compression roller; and if the PLC determines that the compression roller speeds are asynchronous, outputting an alarm electric signal to the alarm device and/or outputting a display electric signal to the display device. The warning device and/or the display device can remind an operator that the speed of the compression roller is not synchronous currently, and the bobbin paper is broken, so that the operator can perform maintenance operation in time.

Of course, in other embodiments of the present invention, the PLC313 may be a PLC of the cigarette making machine, and the PLC of the cigarette making machine may directly perform the processing of stopping the operation of the cigarette making machine when determining that the compression roller speed is not synchronized, or perform an alarm and/or display the information of the compression roller speed being not synchronized.

In an embodiment of the present invention, the pair of pressing roller synchronization detecting apparatus further includes: and one end of the stop start button is connected with a direct-current high level (such as 24V direct-current voltage), the other end of the stop start button is connected to the input end of the PLC, and the stop start button is used for triggering the PLC to output an alarm electric signal to alarm equipment to give an alarm when a normally open contact of the stop start button is closed, outputting a display electric signal to display equipment to display information of unsynchronized compression roller speed, and/or outputting a stop electric signal to the PLC of the cigarette making machine to stop the operation of the cigarette making machine. When the normally open contact of the stop start button is disconnected, the PLC does not output an alarm electric signal, a display electric signal and a stop electric signal.

In this embodiment, the shutdown initiation button is designed for the purpose of: due to the parametersAnd for reasons such as errors, the press roller synchronous detection device sometimes has wrong detection, the button can be used for shielding the shutdown function (the button contact is disconnected at the moment), and when the device to be detected is recovered to be normal, the button is used for starting the shutdown function (the button contact is closed at the moment).

In a further embodiment of the invention, the shutdown start button may be a self-locking button. The self-locking button has the following characteristics: when the button is pressed, the normally open contact is closed, and after the button is released, the state of the button is still unchanged (self-locking), namely the normally open contact is kept closed; when the button is pressed again and released, the self-locking of the button is released, the normally open contact is disconnected, and the disconnected state is kept.

FIG. 7 is a schematic diagram illustrating electrical connections to a nip roller synchronization detection apparatus according to some embodiments of the present invention. The "dc high level" in fig. 7 is, for example, a 24V dc voltage. As shown in fig. 7, the counter roller synchronization detecting apparatus 700 includes: the cigarette making machine comprises a first absolute value shaft encoder 711, a second absolute value shaft encoder 712, a PLC 713, a calibration starting button 714, a stop starting button 715, an alarm device 716 and a display device 717, wherein the first absolute value shaft encoder 711, the second absolute value shaft encoder 712, the calibration starting button 714, the stop starting button 715, the alarm device 716 and the display device 717 are respectively electrically connected with the PLC 713, the PLC 713 is electrically connected with a cigarette making machine 720, specifically, the PLC 713 is electrically connected to the output end of the cigarette making machine stop button 722, namely, the input end of the cigarette making machine PLC 721. The first absolute value shaft encoder 711, the second absolute value shaft encoder 712, and the PLC 713 are similar to the first absolute value shaft encoder 311, the second absolute value shaft encoder 312, and the PLC313 of fig. 3, respectively, and are not described again here.

As shown in FIG. 7, multiple closures and closings of calibration initiation button 714 may be utilized to calibrate the parameter prior to detecting whether the speed deviation ratio exceeds an allowable value(aboutThe calibration, which has been described in detail above and will not be described in detail herein), and then it may be performed to detect whether the speed deviation ratio exceeds the allowable value. Using calibrated actuating button pairsAnd by calibration, a more accurate speed deviation rate can be obtained.

If the normally open contact of the stop start button 715 is closed and if the PLC 713 determines that the speed deviation ratio exceeds the allowable value, the PLC transmits a stop electric signal to the cigarette machine PLC to stop the cigarette machine PLC from operating, transmits an alarm electric signal to an alarm device to give an alarm (for example, an alarm indicator lamp emits light or a buzzer sounds), and transmits a display electric signal to a display device to display information that the speed of the compression roller is not synchronous. The bobbin paper can be prevented from being broken by stopping the operation of the cigarette making machine, and the alarm device and/or the display device can remind an operator that the speed of the pressing roller is not synchronous currently and the bobbin paper is dangerous to break. And if the PLC determines that the speed deviation rate does not exceed the allowable value, the PLC does not perform processing such as shutdown, alarm, information display and the like. If the normally open contact of the stop start button 715 is open, the PLC does not output an alarm electrical signal, a display electrical signal, and a shutdown electrical signal.

In this embodiment, the purpose of the shutdown start button is designed to: due to the parametersThe press roller synchronous detection device can sometimes have wrong detection due to reasons such as errors, the button can be used for shielding the shutdown function (the button contact is disconnected at the moment), and when the device to be detected is recovered to be normal, the button is used for starting the shutdown function (the button contact is closed at the moment).

FIG. 8 is a flow chart illustrating a method of detecting synchronization to a nip roller according to some embodiments of the present invention.

In step S801, the time T elapsed from the rotation of the drive roller from one phase to the next adjacent phase is detected; the time t elapsed from the rotation of the pinch roller from one phase to the next adjacent phase is detected.

In step S802, a speed deviation rate E is calculated from time T and time T.

In this embodiment, the speed deviation ratio E is calculated:

<math> <mrow> <mrow> <mi>E</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mi>T</mi> <mrow> <mi>t</mi> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> <mo>|</mo> </mrow> <mo>,</mo> </mrow> </math> wherein:

<math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> </math>

wherein d is_i＝T_i/t_iC is an integer, and C is not less than 1. Namely: calculating the time T for C times continuously_iAnd t_iTo obtain d₁、d₂、…d_cAnd the average value is calculated.

In step S803, it is determined whether the speed deviation ratio exceeds an allowable value.

In this embodiment, the PLC determines whether the speed deviation rate E exceeds an allowable value E: if E > E, the process proceeds to step S804, otherwise the process proceeds to step S805. Wherein, e is more than or equal to 1 and more than or equal to 0, when the synchronization degree of the compression roller is required to be higher, e is smaller, for example, e is 0.001, which means that when the speed deviation rate exceeds one thousandth, the speed of the compression roller is determined to be asynchronous; on the contrary, when the synchronization degree of the press rollers is required to be lower, the value is larger. For example, when the speed deviation ratio exceeds one tenth, it means that it is determined that the roll speeds are out of synchronization.

In step S804, the roll speeds are not synchronized.

Furthermore, when the fact that the compression roller speeds are asynchronous is determined, alarming and/or displaying information of the asynchronous compression roller speeds can be carried out so as to remind operators that the current compression roller speeds are asynchronous and the bobbin paper is in danger of breaking; or a shutdown process may be performed to prevent the bobbin paper from being broken.

In step S805, the speed deviation ratio is within the allowable range. Further, processes such as alarming, displaying information, stopping the operation of the cigarette making machine and the like may not be performed.

In this embodiment, the time elapsed for outputting two adjacent phase signals is calculated from the received phase signals, respectively, the velocity deviation ratio is calculated from the calculated time, and it is judged whether the velocity deviation ratio exceeds an allowable value, and if so, it is determined that the roll speeds are out of synchronization. Thus, an automatic detection of whether the press rolls are synchronized or not is achieved.

FIG. 9 is a flowchart illustrating a method of detecting synchronization to a platen according to further embodiments of the present invention.

In step S901, it is determined whether or not the calibration start button is pressed. If pressed, the parameters are matchedThe calibration is performed, the process proceeds to step S902, otherwise the parameters are not calibratedAnd directly making a decision as to whether the speed deviation ratio exceeds a permissible valueUpon detection of the correlation step of the license value, the process proceeds to steps S916 and S917.

In step S902, i is 1. I.e. obtaining the parameter d₁The number of operations performed was noted as the first time.

In step S903, a first absolute value shaft encoder phase signal A is acquired in real time₁. I.e. obtaining the phase signal A of the rotation of the drive roller₁Wherein the first absolute value shaft encoder is mounted on the drive roller.

In step S904, a second absolute value shaft encoder phase signal B is acquired in real time₁. Namely, obtaining a phase signal B of the rotation of the pressure roller₁Wherein the second absolute value shaft encoder is mounted on the pressure roller.

In step S905, in acquisition A₁Then, a first timer is started.

In step S906, B is acquired₁Then, a second timer is started.

In step S907, a first absolute value shaft encoder phase signal A is acquired in real time₂。

In step S908, a second absolute value shaft encoder phase signal B is acquired in real time₂。

In step S909, the phase signal a is judged₁And A₂Whether they are not the same and differ by 1. I.e. determining the phase signal A₁And A₂Whether two adjacent phase signals are generated for rotation of the drive roller. If so, the process proceeds to step S911, otherwise the process returns to step S907, i.e., the first absolute shaft encoder phase signal A is reacquired₂。

In step S910, the phase signal B is determined₁And B₂Whether they are not the same and differ by 1. I.e. determining the phase signal B₁And B₂Whether two adjacent phase signals are generated by the rotation of the pressure roller. If so, the process proceeds to step S912, otherwise the process returns to step S908, i.e., the second absolute value shaft encoder phase is reacquiredBit signal B₂。

In step S911, the first timer stops counting time, and the time recorded by the first timer is determined as T_i。

In step S912, the second timer stops counting time, and the time recorded by the second timer is determined as t_i。

In step S913, it is determined whether i is equal to C. If so, the procedure proceeds to step S915, otherwise, the procedure proceeds to S914.

In step S914, i + 1. At the ith time of acquisition_iWhen the value is not reached, i +1 d is obtained_i+1The value is obtained.

In step S915, calculation is made <math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> <mo>.</mo> </mrow> </math> I.e. calculating the mean valueCompletion parametersAnd (6) calibrating.

In step S916, a first absolute value shaft encoder phase signal a is acquired in real time₁。

In step S917, a second absolute value shaft encoder phase signal B is obtained in real time₁。

In step S918, in acquisition A₁Then, a first timer is started.

In step S919, in acquisition B₁Then, a second timer is started.

In step S920, a first absolute value shaft encoder phase signal a is acquired in real time₂。

In step S921, a second absolute value shaft encoder phase signal B is acquired in real time₂。

In step S922, the phase signal A is determined₁And A₂Whether they are not the same and differ by 1. I.e. determining the phase signal A₁And A₂Whether two adjacent phase signals are generated for rotation of the drive roller. If so, the process proceeds to step S924, otherwise the process returns to step S920, i.e., the first absolute value shaft encoder phase signal A is reacquired₂。

In step S923, the phase signal B is determined₁And B₂Whether they are not the same and differ by 1. I.e. determining the phase signal B₁And B₂Whether two adjacent phase signals are generated by the rotation of the pressure roller. If so, the process proceeds to step S925, otherwise the process returns to step S921, i.e. the second absolute value shaft encoder phase signal B is reacquired₂。

In step S924, the first timer stops counting time, and the time recorded by the first timer is determined as T.

In step S925, the second timer stops counting time, and the time recorded by the second timer is determined as t.

In step S926, the speed deviation ratio is calculated

In step S927, it is determined whether speed deviation ratio E exceeds allowable value E. If so, the process proceeds to step S928, otherwise, it ends.

In step S928, it is determined whether the stop start button contact is closed. If so, the process proceeds to step S929, otherwise, it ends.

At step 929, shutdown and alarm are made and information on the roll speed asynchronism is displayed on the display device.

Thus far, the present invention has been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (15)

1. A device for synchronously detecting a pair of compression rollers is characterized by comprising:

the first absolute value shaft encoder is arranged on the driving roller and used for transmitting a phase signal of the rotation of the driving roller to the PLC;

the second absolute value shaft encoder is arranged on the pressure roller and used for transmitting a phase signal of the rotation of the pressure roller to the PLC, wherein the counter pressure roller comprises a driving roller and a pressure roller;

a PLC for receiving phase signals generated by the rotation of the driving roller from the first absolute shaft encoder and detecting the time T elapsed from the rotation of the driving roller from one phase to the next adjacent phase; for receiving phase signals generated by rotation of the pressure roller from the second absolute value shaft encoder and detecting the time t elapsed from one phase to the next adjacent phase of the pressure roller; calculating a speed deviation rate E according to the time T and the time T, and judging whether the speed deviation rate exceeds an allowable value or not; if so, it is determined that the pair of roll speeds are not synchronized.

2. The apparatus for synchronously detecting the registration rollers according to claim 1, further comprising:

a calibration start button for generating a pulse signal and transmitting the pulse signal to the PLC;

calculating the time T when the PLC receives one pulse signal_iAnd time t_iAnd calculates the speed deviation ratio E:

<math> <mrow> <mi>E</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mi>T</mi> <mrow> <mi>t</mi> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> <mo>|</mo> </mrow> </math>

wherein:

<math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> </math>

wherein d is_i＝T_i/t_iC is an integer, and C is not less than 1.

3. The apparatus for synchronously detecting the registration rollers according to claim 1, comprising:

the PLC itself includes a first timer and a second timer,

the PLC triggers the first timer to start timing when receiving a phase signal generated by rotation of the driving roller, and triggers the first timer to stop timing when receiving an adjacent next phase signal generated by rotation of the driving roller, wherein the time elapsed from the start of timing to the stop of timing is time T; the PLC triggers the second timer to start timing when receiving a phase signal generated by rotation of the pressing roller, and triggers the second timer to stop timing when receiving an adjacent next phase signal generated by rotation of the pressing roller, wherein the time elapsed from the start of timing to the stop of timing is time t.

4. The apparatus for synchronously detecting the registration rollers according to claim 1, further comprising:

the first timer is used for receiving a first timing starting signal of the PLC and starting timing; receiving a first stop timing signal of the PLC, stopping timing, and transmitting the time T from the start of timing to the stop of timing to the PLC;

the second timer is used for receiving a second timing starting signal of the PLC and starting timing; receiving a second stop timing signal of the PLC, stopping timing, and transmitting the time t from the start of timing to the stop of timing to the PLC;

wherein the PLC transmits the first timing start signal to the first timer when receiving a phase signal generated by rotation of the driving roller; when receiving an adjacent next phase signal generated by rotation of the driving roller, sending the first stop timing signal to the first timer; when receiving a phase signal generated by the rotation of the pressure roller, sending a second timing starting signal to the second timer; and when receiving the next adjacent phase signal generated by the rotation of the pressure roller, sending the second stop timing signal to the second timer, and receiving the time T transmitted by the first timer and the time T transmitted by the second timer.

5. The device for detecting the synchronization of the pressing rollers according to claim 2, wherein the calibration start button is a non-self-locking button.

6. The apparatus for synchronously detecting the registration rollers according to claim 1, comprising:

and if the PLC determines that the speeds of the pair of compression rollers are asynchronous, outputting a stop electric signal to the PLC of the cigarette making machine to stop the operation of the cigarette making machine.

7. The apparatus for synchronously detecting the registration rollers according to claim 1, further comprising:

the alarm device is used for receiving an alarm electric signal from the PLC and giving an alarm; and/or

The display equipment is used for receiving a display electric signal from the PLC and displaying the information that the speed of the pair of compression rollers is not synchronous;

and if the PLC determines that the speeds of the pair of compression rollers are asynchronous, outputting an alarm electric signal to the alarm device and/or outputting a display electric signal to the display device.

8. The apparatus for synchronously detecting the registration rollers according to claim 7, comprising:

the alarm device comprises an alarm indicator lamp and/or a buzzer;

the display device is a display.

9. The apparatus for synchronously detecting the registration rollers according to claim 1, further comprising:

and the stop start button is used for triggering the PLC to output an alarm electric signal to the alarm device, outputting a display electric signal to the display device and/or outputting a stop electric signal to the cigarette machine PLC.

10. The device for detecting the synchronization of the pressing rollers according to claim 9, wherein the stop start button is a self-locking button.

11. A synchronous detection system for a pair of compression rollers is characterized by comprising: the pair of pressing roller synchronous detection device and the cigarette making machine according to any one of claims 1 to 10, wherein the cigarette making machine comprises a driving roller, a pressing roller and a cigarette making machine stop button.

12. A method for synchronously detecting a pair of compression rollers is characterized by comprising the following steps:

detecting a time T elapsed from the rotation of the drive roller from one phase to the next adjacent phase;

detecting the time t elapsed from the rotation of the pressure roller from one phase to the next adjacent phase, wherein the pair of pressure rollers comprises a driving roller and a pressure roller;

calculating a speed deviation rate E according to the time T and the time T;

judging whether the speed deviation rate exceeds an allowable value or not; if so, it is determined that the pair of roll speeds are not synchronized.

13. The method for detecting synchronization of opposed press rollers according to claim 12,

calculating a speed deviation ratio E:

<math> <mrow> <mrow> <mi>E</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mi>T</mi> <mrow> <mi>t</mi> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> </mrow> </mfrac> <mo>-</mo> <mn>1</mn> <mo>|</mo> </mrow> <mo>,</mo> </mrow> </math> wherein:

<math> <mrow> <mover> <mi>d</mi> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <msub> <mi>d</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>C</mi> </munderover> <mfrac> <msub> <mi>T</mi> <mi>i</mi> </msub> <msub> <mi>t</mi> <mi>i</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mn>1</mn> <mi>C</mi> </mfrac> <mrow> <mo>(</mo> <mfrac> <msub> <mi>T</mi> <mn>1</mn> </msub> <msub> <mi>t</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mn>2</mn> </msub> <msub> <mi>t</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mo>.</mo> <mo>.</mo> <mo>.</mo> <mo>+</mo> <mfrac> <msub> <mi>T</mi> <mi>C</mi> </msub> <msub> <mi>t</mi> <mi>C</mi> </msub> </mfrac> <mo>)</mo> </mrow> </mrow> </math>

wherein d is_i＝T_i/t_iC is an integer, and C is not less than 1.

14. The method for detecting the synchronization of the press rolls according to claim 12, wherein if it is determined that the speed of the press rolls is not synchronized, an alarm is given and/or information indicating the speed of the press rolls is not synchronized is displayed.

15. The method for detecting the synchronization of the pair of rollers according to claim 12, wherein if it is determined that the speeds of the pair of rollers are not synchronized, the operation of the cigarette making machine is stopped.