CN111922536A - Cigarette filter tip laser drilling angle positioning method based on FPGA hardware logic control - Google Patents

Abstract

The invention relates to a laser drilling angle positioning method for a cigarette filter tip based on FPGA hardware logic control, which belongs to the technical field of intelligent control and comprises the following steps of inputting a synchronous signal to an FPGA module; setting punching parameters; performing operation by the FPGA module to obtain a pulse signal; the laser receives the pulse signal of the FPGA module and transmits a laser control logic signal to the laser power circuit. The method for determining the laser drilling position according to the rotation angle by adopting the method of converting the distance into the angle consumes less internal resources of the FPGA chip, can adopt the FPGA chip with lower cost to realize the same logic function, has response blocks and enhanced real-time property, is suitable for online production, and increases the control precision and the control response speed.

Description

Cigarette filter tip laser drilling angle positioning method based on FPGA hardware logic control

Technical Field

The invention relates to a laser drilling angle positioning method for a cigarette filter tip based on FPGA hardware logic control, and belongs to the technical field of intelligent control.

Background

The on-line laser boring technology of cigarette is a new technology developed in the tobacco industry in recent years. It is an effective means for reducing the tar content of cigarette. The principle is that during cigarette rolling, high-energy laser is utilized to radially perforate tipping paper to form tiny holes on a cigarette filter tip, and when the cigarette is smoked, smoke is diluted, so that tar content is reduced, and adverse effects on human bodies and the environment are reduced.

However, the technology is not mature, and how to realize automatic control and how to realize uniform perforation in the circumference in production is still a technical problem.

Disclosure of Invention

In order to solve the technical problem, the invention provides a cigarette filter tip laser drilling angle positioning method based on FPGA hardware logic control, wherein the FPGA is named as follows: the field programmable gate array, the foreign language name is: the Field Programmable Gate Array, called FPGA for short, belongs to the category: AI chip. The method has less FPGA internal resource consumption, allows the same logic function to be realized by adopting an FPGA chip with lower cost, and realizes the laser drilling angle control of variable parameters. The specific technical scheme is as follows:

a laser drilling angle positioning method for cigarette filter tips based on FPGA hardware logic control comprises the following steps,

step 1: inputting a synchronous signal to the FPGA module: the synchronous signal is a reference signal for providing the starting and ending of the cigarette rotation position, one period T of the synchronous signal represents that every circle of cigarette rotation, every circle of cigarette rotation at any speed, the laser uniformly punches N holes in the radial direction of the cigarette according to the set punching number N, and the synchronous signal is input to the FPGA module;

step 2: setting punching parameters: transmitting specific punching parameters to the FPGA module through a human-computer interface;

and step 3: and (3) FPGA module operation: performing operation on the signals in the step 1 and the step 2 through an FPGA module to obtain pulse signals;

and 4, step 4: laser pulse control output: the laser receives a pulse signal of the FPGA module and transmits a laser control logic signal to a laser power circuit, wherein the signal is 1 to indicate that the punching laser is started, and the signal is 0 to indicate that the punching laser is stopped.

Further, the specific operation process of the FPGA module in step 3 is as follows:

step 3.1: measuring a period T of the synchronization signal, and registering the period T,

step 3.2: receiving the number N of punched holes;

step 3.3: the upper computer firstly converts the punching number N into hole pitch angle equivalent, and the conversion formula is pT = (2)ⁿN), pT represents the equivalent value of the hole interval angle corresponding to N holes, 2ⁿEquivalent is equal to 360 degrees, then the converted pT is downloaded to an FPGA module,

step 3.4: the FPGA module makes the period T2ⁿEqually dividing, changing the distance equivalent into angle equivalent, and the formula is dT = T/2ⁿdT represents the pulse time graduation equivalent corresponding to 1/360 degrees, T represents the time corresponding to 360 degrees, namely the period, n is a positive integer value, the larger n is, the higher the precision is,

step 3.5: the pulse count measurement is further performed on the synchronization signal in increments of dT, and when the count increment of dT = pT, a laser pulse signal is output.

The invention has the beneficial effects that:

the invention changes the FPGA module operation formula, abandons the traditional division operation (the shift operation replaces the division operation, the division operation consumes large resources of the FPGA module, needs more processing cycles, has poor real-time performance, and the shift operation is very simple logic operation on an FPGA chip), adopts a method of converting distance into angle, determines the laser punching position according to the rotation angle, consumes few FPGA module operation resources, has high operation efficiency and enhanced real-time performance, is suitable for online continuous production, and increases control precision and effect speed.

Drawings

Figure 1 is a logical block diagram of the present invention,

figure 2 is an FPGA module operation diagram of the present invention,

fig. 3 is a conventional FPGA module operation diagram.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings.

As shown in figure 1, the laser drilling angle positioning method of the cigarette filter rod comprises the following steps,

step 1: inputting a synchronous signal to the FPGA module: the synchronous signal is a reference signal for providing the starting and ending of the cigarette rotation position, one period T of the synchronous signal represents that every circle of cigarette rotation, every circle of cigarette rotation at any speed, the laser uniformly punches N holes in the radial direction of the cigarette according to the set punching number N, and the synchronous signal is input to the FPGA module;

step 2: setting punching parameters: transmitting specific punching parameters to the FPGA module through a human-computer interface;

and step 3: and (3) FPGA module operation: the signals of the step 1 and the step 2 are operated by an FPGA module to obtain pulse signals, the specific operation process is,

step 3.1: measuring a period T of the synchronization signal, and registering the period T,

step 3.2: receiving the number N of punched holes;

step 3.3: the upper computer firstly converts the punching number N into hole pitch angle equivalent, and the conversion formula is pT = (2)ⁿN), pT represents the equivalent value of the hole interval angle corresponding to N holes, 2ⁿEquivalent is equal to 360 degrees, then the converted pT is downloaded to an FPGA module,

step 3.4: the FPGA module makes the period T2ⁿEqually dividing (byte is shifted to right by n bits), and changing the distance equivalent into angle equivalent, wherein the formula is dT = T/2ⁿdT represents the pulse time graduation equivalent corresponding to 1/360 degrees, T represents the time corresponding to 360 degrees, namely the period, n is a positive integer value, the larger n is, the higher the precision is,

step 3.5: the pulse count measurement is further performed on the synchronization signal in increments of dT, and when the count increment of dT = pT, a laser pulse signal is output.

And 4, step 4: laser pulse control output: the laser receives a pulse signal of the FPGA module and transmits a laser control logic signal to a laser power circuit, wherein the signal is 1 to indicate that the punching laser is started, and the signal is 0 to indicate that the punching laser is stopped.

For example, assuming that 5 holes are punched according to the process requirement (N = 5), the FPGA control logic outputs 5 control pulse signals at equal intervals in one period according to the rising edge and the falling edge of the synchronization signal, and the positions of the pulse signals relative to the edges of the synchronization signal are kept unchanged no matter the speed is high or low (the length of the synchronization period).

Referring to fig. 3, the basic logic algorithm of the conventional FPGA processing is:

step (1): measuring a period T of the synchronization signal, and registering the period T,

step (2): receiving the number N of punched holes;

and (3): dividing the period T into N equal parts, namely dividing operation, and expressing dT = T/N;

and (4): and measuring the increment of the synchronous signal count, and outputting a laser pulse signal when the increment of the synchronous signal count = dT.

The disadvantages of this algorithm are: because division operation of FPGA hardware logic consumes resources, expensive FPGA chips are needed for realizing the same logic function, and meanwhile, because the FPGA division operation needs multi-cycle processing, the real-time performance of the FPGA chip is also poor.

This patent is through turning into angle signal with periodic signal, and the operation internal consumption is little, and the effect is fast, and the real-time nature is strong.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (2)

1. A laser drilling angle positioning method for cigarette filter tips based on FPGA hardware logic control is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

step 1: inputting a synchronous signal to the FPGA module: the synchronous signal is a reference signal for providing the starting and ending of the cigarette rotation position, one period T of the synchronous signal represents that every circle of cigarette rotation, every circle of cigarette rotation at any speed, the laser uniformly punches N holes in the radial direction of the cigarette according to the set punching number N, and the synchronous signal is input to the FPGA module;

step 2: setting punching parameters: transmitting specific punching parameters to the FPGA module through a human-computer interface;

and step 3: and (3) FPGA module operation: performing operation on the signals in the step 1 and the step 2 through an FPGA module to obtain pulse signals;

and 4, step 4: laser pulse control output: the laser receives a pulse signal of the FPGA module and transmits a laser control logic signal to a laser power circuit, wherein the signal is 1 to indicate that the punching laser is started, and the signal is 0 to indicate that the punching laser is stopped.

2. The laser drilling angle positioning method for cigarette filter rods based on FPGA hardware logic control according to claim 1, characterized in that: the specific operation process of the FPGA module in the step 3 is as follows:

step 3.1: measuring a period T of the synchronization signal, and registering the period T,

step 3.2: receiving the number N of punched holes;

step 3.3: the upper computer firstly converts the punching number N into hole pitch angle equivalent, and the conversion formula is pT = (2)ⁿN), pT represents the equivalent value of the hole interval angle corresponding to N holes, 2ⁿEquivalent is equal to 360 degrees, then the converted pT is downloaded to an FPGA module,

step 3.4: the FPGA module makes the period T2ⁿHalving (shift operation) the distance equivalent into an angle equivalent, with the formula dT = T/2ⁿdT represents the pulse time graduation equivalent corresponding to 1/360 degrees, T represents the time corresponding to 360 degrees, namely the period, n is a positive integer value, the larger n is, the higher the precision is,

step 3.5: the pulse count measurement is further performed on the synchronization signal in increments of dT, and when the count increment of dT = pT, a laser pulse signal is output.

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