Laser cutting method and device for cigarette strips

Abstract

The invention provides a cigarette bar laser cutting method and device. The method comprises the steps that machining parameters are obtained, wherein the machining parameters comprise the cigarette making machine conveying speed V1, the galvanometer cutting speed V2, the cigarette diameter D and the cigarette length L; according to the processing parameters, the cigarette bar cutting angle theta is obtained through internal calculation, the cigarette bar cutting angle theta is the included angle formed by the laser moving path and the cross section of the cigarette bar, and the calculation process of the cigarette bar cutting angle theta is as follows: the cigarette bar monorail conveying speed V3 = L * (V1 / 2); the cigarette bar cutting time t is equal to D / V2; the cigarette bar moving distance S is equal to V3 * t; the cigarette bar cutting angle theta is equal to arctan (S / D); the laser moving path comprises an odd-number path AD and an even-number path EH, a laser beam is emitted according to the cigarette bar cutting angle, the laser beam is driven to circularly pass through the odd-number path AD and the even-number path EH through the movement of the galvanometer, and the cigarette bars are cut at equal intervals back and forth. The cigarette bar laser cutting method has the advantages in the aspects of cutting precision, cutting efficiency, dynamic cutting adaptability, cutting path planning optimization and the like.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco rod cutting, and in particular to a tobacco rod laser cutting method and a device using the method. Background Art

[0002] At present, the tobacco industry uses mechanical blade cutting to cut tobacco rods. It is a physical cutting method and a highly automated production method. The existing mechanical blade cutting method produces noise and dust. Secondly, the commonly used blades are consumables and need to be replaced every 8 hours per shift.

[0003] With the development of science and technology, picosecond lasers can directly destroy the chemical bonds that connect the atomic components of a substance. This method, known as cold processing, does not produce a thermal effect, but directly separates the substance into atoms, replacing traditional mechanical cutting methods. Laser cutting is a non-contact process, which means that no physical pressure or damage will be caused to the tobacco rod during the cutting process, thereby maintaining the integrity of the tobacco rod and improving the yield rate of tobacco rod cutting. In the production process of cigarettes, it is necessary to dynamically cut the longer tobacco rods during transportation to form single or double length cigarettes. How to achieve dynamic cutting of tobacco rods during transportation is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the above, the present invention provides a tobacco rod laser cutting method and device to solve the technical problem of dynamic cutting of tobacco rods during transportation.

[0005] The technical solution of the present invention:

[0006] The present invention provides a tobacco rod laser cutting method, comprising the following steps:

[0007] Step 1: Obtain processing parameters: cigarette machine conveying speed V1, galvanometer cutting speed V2, cigarette diameter D and cigarette length L;

[0008] Step 2: According to the processing parameters, the cigarette rod cutting angle θ is obtained through internal calculation. The cigarette rod cutting angle θ is the angle formed by the laser moving path and the cigarette cross section. The calculation process of the cigarette rod cutting angle θ is as follows:

[0009] Cigarette rod single track conveying speed V3 = L × (V1 ÷ 2);

[0010] Tobacco rod cutting time t = D ÷ V2;

[0011] The distance the cigarette rod moves S = V3 × t;

[0012] Tobacco rod cutting angle θ = arctan (S ÷ D);

[0013] Step 3: The laser moving path includes an odd path AD and an even path EH. The laser beam is emitted according to the cutting angle of the tobacco rod. The laser beam is driven by the movement of the galvanometer to circulate through the odd path AD and the even path EH, cutting the tobacco rod back and forth at equal distances.

[0014] Furthermore, the tobacco rods include a first tobacco rod and a second tobacco rod, the first tobacco rod and the second tobacco rod are conveyed in parallel, and the odd path AD is a path swept by the laser beam from the outside of the first tobacco rod to the outside of the second tobacco rod to complete the odd number of cuts of the first tobacco rod and the second tobacco rod.

[0015] Furthermore, the odd path AD includes a first odd cutting path AB, an odd jump path BC and a second odd cutting path CD. The first odd cutting path AB is the path swept by the laser beam when cutting the first tobacco rod, the odd jump path BC is the path swept by the laser beam from the completion of cutting the first tobacco rod to the starting position of cutting the second tobacco rod, and the second odd cutting path CD is the path swept by the laser beam when cutting the second tobacco rod.

[0016] Furthermore, the tobacco rod moving distance S is the moving distance of the second tobacco rod after the first tobacco rod is cut, and the tobacco rod cutting angle θ is the angle formed by the first odd cutting path AB and the cigarette diameter D.

[0017] Furthermore, the even-numbered path EH is a path swept by the laser beam from the outside of the second tobacco rod to the outside of the first tobacco rod, so as to complete the even-numbered cutting of the second tobacco rod and the first tobacco rod.

[0018] Furthermore, the even-numbered path EH includes a first even-numbered cutting path EF, an even-numbered jump path FG and a second even-numbered cutting path GH. The first even-numbered cutting path EF is the path swept by the laser beam when cutting the second tobacco rod. The even-numbered jump path FG is the path swept by the laser beam from the completion of cutting the second tobacco rod to the starting position of cutting the first tobacco rod. The second even-numbered cutting path GH is the path swept by the laser beam when cutting the first tobacco rod.

[0019] Furthermore, the cigarette rod moving distance S is the moving distance of the first cigarette rod after the second cigarette rod is cut, and the cigarette rod cutting angle θ is the angle formed by the first even-numbered cutting path EF and the cigarette diameter D.

[0020] Furthermore, the galvanometer movement includes jumping movement and cutting movement. The jumping movement includes movement along the odd jumping path BC and movement along the even jumping path FG. During the jumping movement, the laser is in an off state. The cutting movement includes movement along the first odd cutting path AB and the second odd cutting path CD, and movement along the first even cutting path EF and the second even cutting path GH. During the cutting movement, the laser is in an on state to perform trajectory cutting processing.

[0021] The present invention also proposes a device for the above-mentioned tobacco rod laser cutting method, comprising a picosecond ultraviolet laser for emitting a laser beam, a beam expander for adjusting the diameter and divergence angle of the laser beam, an optical path adjustment mechanism, a galvanometer for positioning and scanning, and a field lens for improving the collimation of the laser beam, which are arranged in sequence along the output optical path direction; the optical path adjustment mechanism comprises a plurality of reflective lenses arranged in sequence along the output optical path direction, and a telescopic light guide connected in sequence between the plurality of reflective lenses, the telescopic light guide being connected between two reflective lenses in an adjustable length, and the reflective lens located at the very end in the output optical path direction being connected to the galvanometer through the telescopic light guide, so as to adjust the cutting position of the laser beam emitted by the field lens along the X-axis, Y-axis, and Z-axis directions in three-dimensional space.

[0022] Furthermore, the reflective lens includes a mirror housing and a reflective lens installed on the mirror housing, the reflective lenses are arranged in a degree, the mirror housing is provided with an incident port and an outlet for the laser beam to pass through, the incident port and the outlet of the mirror housing are sealed with a light-transmitting mirror, and the mirror housing is connected with a water inlet pipe and a water outlet pipe for connecting a laser water chiller so that the mirror housing () is filled with cooling water.

[0023] The tobacco rod laser cutting method proposed in the present invention has shown significant beneficial effects compared with the traditional cutting method:

[0024] 1. High-precision cutting: The present invention obtains the processing parameters accurately and obtains the cutting angle of the tobacco rod through internal calculation, ensuring that the laser beam can cut the tobacco rod with high precision according to the predetermined path. This cutting method not only improves the cutting accuracy, but also ensures the flatness of the cut end surface, meeting the tobacco processing industry's demand for high-quality tobacco rods.

[0025] 2. High efficiency of cutting: The present invention uses the movement of the galvanometer to drive the laser beam to cycle through the odd and even paths, and cut the tobacco rods at equal distances. This cutting method not only improves the cutting efficiency, but also reduces the energy consumption and time cost during the cutting process, bringing higher production efficiency to the tobacco processing industry.

[0026] 3. Dynamic cutting adaptability: The present invention can realize the cutting of moving tobacco rods, and the cutting process is stable and reliable. This dynamic cutting adaptability not only broadens the application scope of the cutting equipment, but also improves the flexibility and adaptability of the cutting equipment, meeting the cutting requirements of tobacco rods of different specifications.

[0027] 4. Intelligent cutting control: The present invention dynamically adjusts the cutting path and power of the laser beam through internal calculation and real-time monitoring of the movement state and position information of the tobacco rod. This intelligent cutting control method not only improves the cutting accuracy and stability, but also reduces the difficulty of operation and the cost of manual intervention, providing strong support for the automated production of the tobacco processing industry.

[0028] 5. Optimize cutting path planning: The present invention improves cutting efficiency and cutting quality by optimizing the cutting path planning algorithm. This optimization algorithm not only reduces the waste generation and cutting errors during the cutting process, but also improves the utilization rate and economic benefits of the cutting equipment.

[0029] In summary, the tobacco rod laser cutting method proposed in the present invention has shown significant beneficial effects in cutting accuracy, cutting efficiency, dynamic cutting adaptability, intelligent cutting control and optimized cutting path planning, providing strong support for the development of the tobacco processing industry.

[0030] The preferred embodiments of the present invention and their beneficial effects will be further described in detail in conjunction with specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but should not be construed as limiting the present invention. In the accompanying drawings:

[0032] Figure 1 It is a flow chart of the tobacco rod laser cutting method of the present invention;

[0033] Figure 2 It is a dynamic cutting schematic diagram of an odd path of the tobacco rod laser cutting method of the present invention;

[0034] Figure 3 It is a dynamic cutting schematic diagram of an even-numbered path of the tobacco rod laser cutting method of the present invention;

[0035] Figure 4 is a timing diagram of the tobacco rod laser cutting method of the present invention;

[0036] Figure 5 A three-dimensional diagram of the tobacco rod laser cutting device of the present invention;

[0037] Figure 6 This is a front view of the tobacco rod laser cutting device of the present invention;

[0038] Figure 7 It is a structural diagram of the optical path adjustment mechanism of the tobacco rod laser cutting device of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of the tobacco rod laser cutting device of the present invention;

[0040] Fig. 9 A stereoscopic view of a reflective lens of a tobacco rod laser cutting device of the present invention;

[0041] Fig.10 A cross-sectional view of a reflective lens of a tobacco rod laser cutting device of the present invention;

[0042] Fig.11 A three-dimensional diagram of the telescopic light guide of the tobacco rod laser cutting device of the present invention;

[0043] Fig.12 A cross-sectional view of a telescopic light guide of a tobacco rod laser cutting device of the present invention;

[0044] Fig.13 It is a schematic diagram of the structure of the galvanometer of the tobacco rod laser cutting device of the present invention.

[0045] Explanation of the accompanying drawings: picosecond ultraviolet laser 1, beam expander 2, optical path adjustment mechanism 3, galvanometer 4, field lens 5, reflecting lens 31, telescopic light guide 32, first fixed bracket 33, second fixed bracket 34, third fixed bracket 35, mirror housing 311, reflecting lens 312, incident port 313, exit port 314, water inlet pipe 315, water outlet pipe 316, first light guide 321, second light guide 322, first reflector 41, first motor 42, second reflector 43, second motor 44, visual camera 6, control center 7, fixing plate 8. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0047] See also Figures 1 to 3 The present invention provides a tobacco rod laser cutting method, comprising the following steps:

[0048] Step 1: Obtain processing parameters: cigarette making machine conveying speed V1, galvanometer cutting speed V2, cigarette diameter D and cigarette length L.

[0049] Step 2: According to the processing parameters, the cigarette rod cutting angle θ is obtained through internal calculation. The cigarette rod cutting angle θ is the angle formed by the laser moving path and the cigarette cross section. The calculation process of the cigarette rod cutting angle θ is as follows:

[0050] Cigarette rod single track conveying speed V3 = L × (V1 ÷ 2);

[0051] Tobacco rod cutting time t = D ÷ V2;

[0052] The distance the cigarette rod moves S = V3 × t;

[0053] The tobacco rod cutting angle θ = arctan (S ÷ D).

[0054] Step 3: The laser moving path includes an odd path AD and an even path EH. The laser beam is emitted according to the cutting angle of the tobacco rod. The laser beam is driven by the movement of the galvanometer to circulate through the odd path AD and the even path EH, cutting the tobacco rod back and forth at equal distances.

[0055] Specifically, Figure 1 As shown, the tobacco rods include a first tobacco rod 10 and a second tobacco rod 20, and the first tobacco rod 10 and the second tobacco rod 20 are conveyed in parallel along the direction indicated by the arrow.

[0056] The odd path AD is the path swept by the laser beam from the outside of the first cigarette rod 10 to the outside of the second cigarette rod 20 to complete the odd number of cuttings (such as the 1st, 3rd, 5th...) of the first cigarette rod 10 and the second cigarette rod 20. The odd path AD includes the first odd cutting path AB, the odd jump path BC and the second odd cutting path CD. The first odd cutting path AB is the path swept by the laser beam when cutting the first cigarette rod 10. The odd jump path BC is the path swept by the laser beam from the first cigarette rod 10 to the starting position of cutting the second cigarette rod 20 after the laser beam completes the cutting of the first cigarette rod 10. The second odd cutting path CD is the path swept by the laser beam when cutting the second cigarette rod 20. The cigarette rod moving distance S is the moving distance of the second cigarette rod 20 after the first cigarette rod 10 is cut. The cigarette rod cutting angle θ is the angle formed by the first odd cutting path AB and the cigarette rod diameter D.

[0057] The even path EH is the path swept by the laser beam from the outside of the second cigarette rod 20 to the outside of the first cigarette rod 10 to complete the even number of cuts (such as the 2nd, 4th, 6th...) of the second cigarette rod 20 and the first cigarette rod 10. The even path EH includes the first even cutting path EF, the even jump path FG and the second even cutting path GH. The first even cutting path EF is the path swept by the laser beam when cutting the second cigarette rod 20. The even jump path FG is the path swept by the laser beam from the second cigarette rod 20 to the starting position of cutting the first cigarette rod 10 after the laser beam completes cutting the second cigarette rod 20. The second even cutting path GH is the path swept by the laser beam when cutting the first cigarette rod 10. The cigarette rod moving distance S is the moving distance of the first cigarette rod 10 after the second cigarette rod 20 is cut. The cigarette rod cutting angle θ is the angle formed by the first even cutting path EF and the cigarette rod diameter D.

[0058] See also Figure 4, the galvanometer movement includes a jump movement and a cutting movement, and the jump movement includes a movement along an odd jump path BC, and a movement along an even jump path FG. In the jump movement, the laser is in an off state, which does not affect the processing of the track, so it can move at a very high speed. The cutting movement includes a movement along the first odd cutting path AB and the second odd cutting path CD, and a movement along the first even cutting path EF and the second even cutting path GH. In the cutting movement, the laser is in an on state to perform cutting processing of the track. The jump movement includes high-speed movement along the odd jump path BC and the even jump path FG, so that the galvanometer can quickly move to the next cutting position when the laser is turned off. This high-speed jump not only reduces the non-processing time in the cutting process, but also improves the overall cutting efficiency. By separating the jump movement and the cutting movement, the present invention can turn off the laser during the jump process, thereby avoiding unnecessary energy consumption. This design not only reduces the energy consumption in the cutting process, but also reduces the wear of the laser, extends the service life of the equipment, and reduces maintenance costs.

[0059] The tobacco rod laser cutting method proposed in the present invention has shown significant beneficial effects compared with the traditional cutting method:

[0060] 1. High-precision cutting: The present invention obtains the processing parameters accurately and obtains the cutting angle of the tobacco rod through internal calculation, ensuring that the laser beam can cut the tobacco rod with high precision according to the predetermined path. This cutting method not only improves the cutting accuracy, but also ensures the flatness of the cut end surface, meeting the tobacco processing industry's demand for high-quality tobacco rods.

[0061] 2. High efficiency of cutting: The present invention uses the movement of the galvanometer to drive the laser beam to cycle through the odd and even paths, and cut the tobacco rods at equal distances. This cutting method not only improves the cutting efficiency, but also reduces the energy consumption and time cost during the cutting process, bringing higher production efficiency to the tobacco processing industry.

[0062] 3. Dynamic cutting adaptability: The present invention can realize the cutting of moving tobacco rods, and the cutting process is stable and reliable. This dynamic cutting adaptability not only broadens the application scope of the cutting equipment, but also improves the flexibility and adaptability of the cutting equipment, meeting the cutting requirements of tobacco rods of different specifications.

[0063] 4. Intelligent cutting control: The present invention dynamically adjusts the cutting path and power of the laser beam through internal calculation and real-time monitoring of the movement state and position information of the tobacco rod. This intelligent cutting control method not only improves the cutting accuracy and stability, but also reduces the difficulty of operation and the cost of manual intervention, providing strong support for the automated production of the tobacco processing industry.

[0064] 5. Optimize cutting path planning: The present invention improves cutting efficiency and cutting quality by optimizing the cutting path planning algorithm. This optimization algorithm not only reduces the waste generation and cutting errors during the cutting process, but also improves the utilization rate and economic benefits of the cutting equipment.

[0065] In summary, the tobacco rod laser cutting method proposed in the present invention has shown significant beneficial effects in cutting accuracy, cutting efficiency, dynamic cutting adaptability, intelligent cutting control and optimized cutting path planning, providing strong support for the development of the tobacco processing industry.

[0066] See also Figures 5 to 8 The present invention provides a tobacco rod laser cutting device that is applied with the above-mentioned tobacco rod laser cutting method, comprising a picosecond ultraviolet laser 1, a beam expander 2, an optical path adjustment mechanism 3, a galvanometer 4 and a field lens 5 arranged in sequence along the output optical path. The picosecond ultraviolet laser 1 is used to emit a laser beam. The beam expander is used to adjust the diameter of the laser beam and the divergence angle of the laser beam. The optical path adjustment mechanism 3 comprises a plurality of reflective lenses 31 arranged in sequence along the output optical path, and a telescopic light guide 32 connected in sequence between the plurality of reflective lenses 31. The telescopic light guide 32 is connected between two reflective lenses 31 with adjustable length, and the reflective lens 31 at the end of the output optical path is connected to the galvanometer 4 through the telescopic light guide 32, so as to adjust the cutting position of the laser beam emitted by the field lens 5 in the three-dimensional space along the X-axis (front and rear direction), the Y-axis (left and right direction), and the Z-axis (up and down direction). The galvanometer 4 is used for positioning and scanning. The field lens 5 is used to improve the collimation of the laser beam, so that it becomes a parallel beam, so as to focus and cut.

[0067] The tobacco rod laser cutting device provided by the present invention has significant beneficial effects compared with the traditional cutting method:

[0068] 1. High cutting accuracy: The laser beam emitted by the picosecond ultraviolet laser 1, combined with the adjustment of the laser beam diameter and divergence angle by the beam expander 2, and the improvement of the laser beam collimation by the field lens 5, enables the laser beam to be focused on the tobacco rod with extremely high precision, thereby achieving precise cutting. At the same time, the positioning and scanning functions of the galvanometer 4 further ensure the accuracy of the cutting position and the flatness of the cut end face. Picosecond ultraviolet lasers can directly destroy the chemical bonds connecting the atomic components of the substance. This method, known as cold processing, does not produce a thermal effect, but directly separates the substance into atoms, which can replace traditional mechanical cutting methods. The tobacco rod cutting completed by this new laser cutting technology has a small slit, a flat cross section, no bevels, and no burrs.

[0069] 2. Easy adjustment: The design of multiple reflective lenses and adjustable-length telescopic light guides in the optical path adjustment mechanism allows the laser beam to be adjusted along the X-axis, Y-axis, and Z-axis in three-dimensional space, thereby adapting to cutting requirements at different positions and angles, and is easy to upgrade and transform on existing cutting equipment.

[0070] 3. Good dynamic cutting effect: This device is particularly suitable for cutting tobacco rods in motion. By precisely controlling the emission and scanning path of the laser beam, continuous and stable cutting of tobacco rods in motion can be achieved, and the cutting quality is not affected by the speed of the tobacco rods. This feature makes this device have a wide range of application prospects in the tobacco processing industry.

[0071] 4. Compact structure and easy maintenance: The entire device is arranged in sequence along the output light path, with a compact structure and reasonable layout. The connection between each component is stable and reliable, and easy to disassemble and repair.

[0072] 5. Energy saving and environmental protection: As a new way of cutting cigarette rods, laser cigarette rod cutting has multiple advantages such as no dust, no noise, low energy consumption, low loss, high yield, no consumables, intelligent manufacturing, and continuous production.

[0073] In summary, the tobacco rod laser cutting device provided by the present invention has significant beneficial effects such as high cutting accuracy, convenient adjustment, good dynamic cutting effect, compact structure, and easy maintenance, providing a new solution for cutting operations in industries such as tobacco processing.

[0074] In this embodiment, five reflective lenses 31 are provided, which are respectively the first reflective lens, the second reflective lens, the third reflective lens, the fourth reflective lens, and the fifth reflective lens, which are arranged in sequence along the output light path direction. The first reflective lens is arranged at the emission end of the beam expander 2, and the second reflective lens is arranged directly below the first reflective lens, so that the telescopic light guide 32 connected between the first reflective lens and the second reflective lens is arranged perpendicular to the horizontal plane. The third reflective lens and the second reflective lens are arranged horizontally, so that the telescopic light guide 32 connected between the third reflective lens and the second reflective lens is arranged horizontally. The fourth reflective lens and the third reflective lens are arranged horizontally, so that the telescopic light guide 32 between the fourth reflective lens and the third reflective lens is perpendicular to the telescopic light guide 32 between the third reflective lens and the second reflective lens. The telescopic light guide 32 between the fourth reflective lens and the third reflective lens can be telescopic or fixed. The fifth reflective lens is arranged directly below the fourth reflective lens, so that the telescopic light guide 32 connected between the fifth reflective lens and the fourth reflective lens is arranged perpendicular to the horizontal plane. A telescopic light guide 32 is horizontally connected between the fifth reflective lens and the galvanometer 4.

[0075] The telescopic light pipe 32 between the third and second reflective lenses is provided with a first fixing bracket 33, and the telescopic light pipe 32 between the fifth and fourth reflective lenses is provided with a second fixing bracket 34. The telescopic light pipe 32 horizontally connected between the fifth reflective lens and the galvanometer 4 is provided with a third fixing bracket 35.

[0076] By setting up five reflective lenses and connecting them with vertical and horizontal telescopic light guides, the laser beam can be adjusted in multiple angles and directions in three-dimensional space. This design not only improves the flexibility of light path adjustment, but also enables the laser beam to accurately reach the specified cutting position, meeting different cutting requirements.

[0077] The reasonable layout of the reflective lens and the precise connection of the telescopic light guide effectively reduce the energy loss of the laser beam during transmission and improve the efficiency of light path transmission. This helps to ensure that the laser beam has sufficient energy density when it reaches the cutting position, thereby achieving high-quality cutting results.

[0078] The well-designed connection between the reflective lens and the telescopic light guide enhances the structural stability of the entire device, ensuring stable transmission and precise cutting of the laser beam even in complex working environments, thus improving the reliability and durability of the device.

[0079] See also Fig. 9 and Fig.10 In this embodiment, the reflective lens 31 includes a mirror housing 311 and a reflective lens 312 mounted on the mirror housing 311. The reflective lens 312 is arranged at a 45-degree angle. The mirror housing 311 is provided with an incident port 313 and an exit port 314 for the laser beam to pass through. The two ends of the telescopic light guide 32 are respectively connected to the corresponding incident port 313 and the exit port 314.

[0080] In order to cool the reflective lens 312 and avoid the laser hitting the reflective lens 312 to generate a thermal effect, which causes the light spot to deform and the energy to decay, the incident port 313 and the exit port 314 of the mirror housing 311 are sealed with a light-transmitting mirror, and the mirror housing 311 is connected with a water inlet pipe 315 and a water outlet pipe 316 for connecting a laser water chiller so that the mirror housing 311 is filled with cooling water. The cooling water is driven to circulate through the laser water chiller to reduce the temperature. The reflective lens 312 is cooled by cold water to ensure the quality of the light spot and reduce the energy decay and the loss of the reflective lens.

[0081] See also Fig.11 and Fig.12 In this embodiment, the telescopic light guide tube 32 includes a first light guide tube 321 and a second light guide tube 322 slidably connected to the first light guide tube 321. A sealing ring is connected between the first light guide tube 321 and the second light guide tube 322. Both the first light guide tube 321 and the second light guide tube 322 are made of stainless steel tubes.

[0082] See also Fig.13 In this embodiment, the galvanometer 4 includes a first reflector 41, a first motor 42 for driving the first reflector 41 to swing, a second reflector 43, and a second motor 44 for driving the second reflector 43 to swing. The first reflector 41 and the second reflector 43 are driven to swing by the first motor 42 and the second motor 44 respectively, so as to change the reflection angle to accurately control the moving position of the laser beam, achieve high-precision positioning and fast scanning, and the fastest processing speed can reach 5000 mm per second.

[0083] See also Figure 5 In this embodiment, a visual camera 6 for calibration and positioning is installed at one end of the telescopic light guide 32 close to the galvanometer 4.

[0084] The tobacco rod laser cutting device of the present invention further comprises a control center 7 for the laser cutting working state.

[0085] The tobacco rod laser cutting device of the present invention further comprises a fixing plate 8 installed at the bottom of the picosecond ultraviolet laser 1 , and the beam expander 2 and the first reflective lens are installed at one end of the fixing plate 8 .

[0086] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying importance; the words "bottom surface" and "top surface", "inside" and "outside" refer to the geometric direction toward or away from a specific component, respectively.

[0087] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0088] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tobacco rod laser cutting method, characterized in that: The steps include: Step 1: Obtain processing parameters: cigarette machine conveying speed V1, galvanometer cutting speed V2, cigarette diameter D and cigarette length L; Step 2: According to the processing parameters, the cigarette rod cutting angle θ is obtained through internal calculation. The cigarette rod cutting angle θ is the angle formed by the laser moving path and the cigarette cross section. The calculation process of the cigarette rod cutting angle θ is as follows: Cigarette rod single track conveying speed V3 = L × (V1 ÷ 2); Cigarette rod cutting time t = D ÷ V2; The distance the cigarette rod moves S = V3 × t; Tobacco rod cutting angle θ = arctan (S ÷ D); Step 3: The laser moving path includes an odd path AD and an even path EH. The laser beam is emitted according to the cutting angle of the tobacco rod. The laser beam is driven by the movement of the galvanometer to circulate through the odd path AD and the even path EH, cutting the tobacco rod back and forth at equal distances.

2. The tobacco rod laser cutting method according to claim 1, characterized in that: The tobacco rods include a first tobacco rod (10) and a second tobacco rod (20), the first tobacco rod (10) and the second tobacco rod (20) are transported in parallel, and an odd path AD is a path swept by a laser beam moving from the outside of the first tobacco rod (10) to the outside of the second tobacco rod (20) to complete an odd number of cuts of the first tobacco rod (10) and the second tobacco rod (20).

3. The tobacco rod laser cutting method according to claim 2, characterized in that: The odd path AD includes a first odd cutting path AB, an odd jump path BC and a second odd cutting path CD. The first odd cutting path AB is a path swept by the laser beam when cutting the first cigarette rod (10). The odd jump path BC is a path swept by the laser beam from the point where the laser beam starts cutting the second cigarette rod (20) after completing the cutting of the first cigarette rod (10). The second odd cutting path CD is a path swept by the laser beam when cutting the second cigarette rod (20).

4. The tobacco rod laser cutting method according to claim 3, characterized in that: The tobacco rod moving distance S is the moving distance of the second tobacco rod (20) after the first tobacco rod (10) is cut, and the tobacco rod cutting angle θ is the angle formed by the first odd cutting path AB and the cigarette diameter D.

5. The tobacco rod laser cutting method according to claim 1, characterized in that: The even path EH is the path swept by the laser beam from the outside of the second tobacco rod (20) to the outside of the first tobacco rod (10) to complete the even number of cuts of the second tobacco rod (20) and the first tobacco rod (10).

6. The tobacco rod laser cutting method according to claim 5, characterized in that: The even-numbered path EH comprises a first even-numbered cutting path EF, an even-numbered jump path FG and a second even-numbered cutting path GH. The first even-numbered cutting path EF is a path swept by the laser beam when cutting the second cigarette rod (20). The even-numbered jump path FG is a path swept by the laser beam from the position where the laser beam starts cutting the first cigarette rod (10) after completing the cutting of the second cigarette rod (20). The second even-numbered cutting path GH is a path swept by the laser beam when cutting the first cigarette rod (10).

7. The tobacco rod laser cutting method according to claim 6, characterized in that: The cigarette rod moving distance S is the moving distance of the first cigarette rod (10) after the second cigarette rod (20) is cut, and the cigarette rod cutting angle θ is the angle formed by the first even-numbered cutting path EF and the cigarette rod diameter D.

8. The tobacco rod laser cutting method according to claim 6, characterized in that: The galvanometer movement includes jumping movement and cutting movement. The jumping movement includes movement along the odd jumping path BC and movement along the even jumping path FG. During the jumping movement, the laser is in an off state. The cutting movement includes movement along the first odd cutting path AB and the second odd cutting path CD, and movement along the first even cutting path EF and the second even cutting path GH. During the cutting movement, the laser is in an on state to perform trajectory cutting processing.

9. A device for the tobacco rod laser cutting method according to any one of claims 1 to 8, characterized in that: The invention comprises a picosecond ultraviolet laser (1) for emitting a laser beam, a beam expander (2) for adjusting the diameter and divergence angle of the laser beam, an optical path adjustment mechanism (3), a galvanometer (4) for positioning and scanning, and a field lens (5) for improving the collimation of the laser beam. The optical path adjustment mechanism (3) comprises a plurality of reflective lenses (31) arranged in sequence in the direction of the output optical path, and a telescopic light pipe (32) connected in sequence between the plurality of reflective lenses (31), wherein the telescopic light pipe (32) is connected between two reflective lenses (31) in an adjustable length, and the reflective lens (31) at the end of the output optical path is connected to the galvanometer (4) via the telescopic light pipe (32) so as to adjust the cutting position of the laser beam emitted by the field lens (5) along the X-axis, Y-axis, and Z-axis directions in three-dimensional space.

10. The device for the tobacco rod laser cutting method according to claim 9, characterized in that: The reflective lens (31) comprises a mirror housing (311) and a reflective lens (312) mounted on the mirror housing (311); the reflective lens (312) is arranged at a 45-degree angle; an incident port (313) and an outlet (314) for a laser beam to pass through are provided on the mirror housing (311); a light-transmitting mirror is sealedly mounted on the incident port (313) and the outlet (314) of the mirror housing (311); and a water inlet pipe (315) and a water outlet pipe (316) are connected to the mirror housing (311) so as to be connected to a laser water chiller so that the mirror housing (311) is filled with cooling water.

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