Device for realizing laser drilling and laser cleaning by using laser polarity conversion

Abstract

The present invention is a device for realizing laser drilling and laser cleaning by laser polarity conversion, which mainly separates the laser beams emitted by the same laser, and then uses a beam polarity conversion device to convert the polarity of the two separated laser beams, so that the two beams form polarities in different polarization directions, thereby reflecting the control characteristics of two independent lasers; the device can realize that the same laser beam emitted by a laser completes two completely different or identical tasks, such as simultaneously drilling different areas on the same cigarette to realize multi-area drilling, or simultaneously drilling different cigarettes to improve the drilling efficiency, or using laser to clean the glue scale on the drilling drum wheel while drilling cigarettes to realize cleaning while drilling, so as to improve production efficiency and reduce maintenance workload.

Description

Technical Field

[0001] The invention relates to a laser processing device, in particular to a device which realizes laser drilling and laser cleaning by utilizing laser polarity conversion. Background Art

[0002] At present, cigarette laser processing devices are equipped with multiple lasers to independently emit lasers for different tasks. In order to save space, multiple lasers are often combined and transmitted to the inside of the equipment, and then split to different tasks to achieve their work. The use of multiple lasers requires a large space and consumes a lot of energy, so there is room for improvement.

[0003] In the technical solution of a multifunctional punching machine of our company, patent application No. 2018107611451 also conceived a laser to be divided into two laser beams through a beam splitter, and then transmitted to the destination through independent transmission devices. The technical solution of multiple independent transmission devices increases equipment investment and maintenance workload, especially for some small spaces where multiple optical transmission devices cannot coexist, which restricts the application of the technical solution. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for using a single laser beam to form two light beams with the same polarization characteristics and independently controllable sizes through a beam splitter, which are combined by a beam combiner after polarity conversion of the polarization characteristics, and then transported to the vicinity of the destination by the same transmission device to separate the light beams and restore them to two independently controllable light beams, thereby realizing the process of punching holes in different areas of the same cigarette, punching holes in different cigarettes at the same time, and simultaneously cleaning the cigarette punching and the punching drum.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A device for realizing laser drilling and laser cleaning by using laser polarity conversion, placed between the laser output light path and the cigarette adsorbed on the drilling drum, comprising:

[0007] An optical splitter, placed in the laser output light path, for splitting a single laser beam into at least two independent laser beams;

[0008] A polarity conversion device is placed in the optical path of each independent laser beam separated by the optical splitting device, and is used to change the laser to a preset polarization direction and then converge at one point;

[0009] The beam combining lens is placed at the convergence point of the light emitted by the polarity conversion device, and is used to combine the deflected independent lasers into one light;

[0010] The beam splitter is placed in the outgoing light path of the beam combiner to separate lasers with different polarization directions;

[0011] The focusing device is placed in the output light path of the beam splitter, and is used to guide the laser to different areas on the same cigarette to be punched to achieve multi-area punching, or to guide the laser to cigarettes to be punched differently to achieve high-efficiency punching, or to guide the laser to the cigarettes to be punched and to the punching drum of the cigarettes to achieve cleaning of the fouling area of ​​the punching drum while punching.

[0012] The laser cleans the scale on the drum surface while drilling holes. The drilling drum rotates around its own central axis, and the laser focusing device is fixedly arranged, so that the laser scans and cleans the circumference of the drum.

[0013] The conventional laser beam combining principles are: 1. Beam combining of lasers of different wavelengths - that is, using a lens to show different transmission and reflection characteristics of two laser beams of different wavelengths to achieve beam combining and splitting; 2. Beam combining of lasers of the same wavelength - using two beams of the same wavelength but different polarization characteristics, the beam combiner shows different transmission and reflection characteristics of different polarization beams to achieve beam combining and splitting.

[0014] The technical solution is to separate the laser beams emitted by the same laser (same wavelength, same polarization characteristics), firstly divide the output light of the laser into two beams with the same polarization direction and independently controllable size, then use a beam polarity conversion device to transform the polarity of the two separated laser beams, so that the two beams form polarities with different polarization directions, use a beam combining lens to combine and transmit, and then separate them through a beam splitter after arriving near the destination, and then restore them into two beams with different polarization directions and independently controllable size. Different focusing characteristics are achieved by two focusing devices respectively, and different functions are achieved, thereby reflecting the control characteristics of two independent lasers.

[0015] The technical solution further defined in the present invention is:

[0016] Furthermore, the polarity conversion device includes two groups of optical reflective lenses, wherein the output light of one group forms a transmission relationship with the beam combiner / beam splitter, and the output light of the other group forms a reflection relationship with the beam combiner / beam splitter; the optical relationship adopts any one of the following:

[0017] The incident light constituting the reflection relationship forms a plane with its reflected light, and the polarization direction of the incident light is perpendicular to the plane; the polarization direction of the incident light constituting the transmission relationship is parallel to the plane;

[0018] Alternatively, the incident light forming the reflection relationship forms a plane with its reflected light, and the polarization direction of the incident light is parallel to the plane; the incident light forming the transmission relationship has a polarization direction perpendicular to the plane.

[0019] Furthermore, the output light of a polarity conversion device and the reflected light of the beam combiner / beam splitter form a plane, and converge with the output light of the polarity conversion device of another optical path at a point on the incident surface of the beam combiner / beam splitter, which coincides with the intersection of the output light path of the polarity conversion device; the light beams output by the optical splitter device are incident on each polarity conversion device one by one.

[0020] Furthermore, one of the two groups of polarity conversion devices has its optical reflective lenses composed of at least two or more reflective lenses.

[0021] Furthermore, the polarity conversion device that forms a transmission relationship with the beam combiner / beam splitter will output a light beam that forms a transmission relationship with the beam combiner / beam splitter at a 45-degree angle when the beam combiner / beam splitter has a 45-degree reflection characteristic.

[0022] When the beam combiner is 40-70 degrees reflective, a transmission relationship with the beam combiner / beam splitter will appear at an angle of 40-70 degrees.

[0023] Furthermore, the laser is a CO2 type pulsating laser with a wavelength of 9.6-11.6 microns.

[0024] Furthermore, the perforated drum is made of a material having a lower absorption rate to the laser energy of the above wavelength, preferably a metal material.

[0025] Furthermore, the laser used to clean the fouling area of ​​the perforated drum irradiates the drum surface after passing through a focusing device, and its spot is O-shaped, square, or linear, preferably a linear spot after being focused by a cylindrical lens.

[0026] Furthermore, the laser cleans the scale on the drum surface while drilling holes, the drilling drum rotates around its own central axis, and the laser focusing device is fixedly arranged, so that the laser scans and cleans the circumference of the drum.

[0027] Furthermore, the linear light spot has a length of 7-10 mm, preferably 7-8 mm, and a width of 0.5-3 mm, preferably 1-1.5 mm.

[0028] The beneficial effects of the present invention are as follows: the light beam output by one laser can simultaneously form a horizontally polarized light beam and a vertically polarized light beam, and the same laser beam emitted by one laser can complete two completely different or identical tasks. The device reduces the size of the originally required equipment and increases work efficiency.

[0029] Furthermore, during daily operation of the punching machine, the laser burns and vaporizes the surface of the cigarette, and the generated dust, aerosol, tar and other substances will adhere to the surface of the punching drum. After long-term operation, the surface of the punching drum becomes uneven. When the cigarette rolls on such an uneven drum surface, it will jump, which will cause the focal point of the laser on the surface of the cigarette to change, the so-called defocus phenomenon.

[0030] After defocusing occurs, the technical parameters of the cigarette hole, such as the length-to-width ratio, aperture size, and hole depth, will change, which will in turn affect the ventilation of the cigarette, which is undesirable.

[0031] Through the technical solution of the present invention, a part of the laser light of the laser is separated and independently controlled, and after the light beam is transformed, combined, transmitted and split, it is irradiated onto the surface of the drum. Preferably, it is focused into a linear light spot through a cylindrical lens and then irradiated onto the surface of the drum to increase the energy density of the light, change the power of the laser energy and the duration of the operation, and utilize the rotation of the drum itself to vaporize the glue scale and dust adhering to the surface of the drum by the laser energy. The metal drum has almost no absorption of the laser of this wavelength, so the laser cleaning process of the punching drum is realized.

[0032] By adopting the method of punching and cleaning at the same time, the drum wheel can work for a long time without cleaning, which not only ensures the stability of cigarette quality, but also reduces the frequency of mechanical maintenance and wear, while increasing the effective operation rate of the equipment, achieving multiple technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of Example 1;

[0034] Figure 2 , Figure 2.1 is a schematic structural diagram of Example 2;

[0035] Figure 3 It is a schematic diagram of a structure for realizing multi-area perforation in different areas on the same cigarette;

[0036] Figure 4 It is a schematic diagram of the transmission relationship at an angle of 45 degrees;

[0037] Figure 5 It is a schematic diagram of the transmission relationship at an angle of 40-70 degrees;

[0038] Figure 6 is a schematic diagram of the linear focusing region.

[0039] In the figure: laser 1, deflection device 2, polarity conversion device 3, beam combining lens 4, beam splitter 5, focusing device 6, scaling area 7, linear focusing area 8, transmission device 9, plano-convex cylindrical mirror 10. DETAILED DESCRIPTION

[0040] Example 1

[0041] Devices that use laser polarity conversion to achieve multi-path laser drilling, such as Figure 1 and Figure 6 As shown, including:

[0042] A laser 1, used for emitting a single-channel laser;

[0043] A beam splitter or deflection device 2 is placed in the laser output light path to split the single laser beam into two independent laser beams;

[0044] Two sets of polarity conversion devices 3 are respectively placed in the optical paths of two independent laser beams to deflect the two laser beams into parallel polarized light beams and vertical polarized light beams respectively; the polarity conversion devices are composed of two sets of optical reflective lenses.

[0045] The polarity conversion device includes two groups of optical reflective lenses, wherein the output light of one group forms a transmission relationship with the beam combiner / beam splitter, and the output light of the other group forms a reflection relationship with the beam combiner / beam splitter; the incident light forming the reflection relationship and its reflected light form a plane, and the polarization direction of the incident light is perpendicular to the plane (vertical polarization). The polarization direction of the incident light forming the transmission relationship is parallel to the plane (parallel polarization). The two groups of polarity conversion devices 3 each form a plane 1 and a plane 2, wherein plane 2 intersects with plane 1, and the intersection line of the two intersects obliquely at the beam combiner.

[0046] The output light of one polarity conversion device and the reflected light of the beam combiner / beam splitter form a plane, and converge with the output light of the polarity conversion device of another optical path at a point on the incident surface of the beam combiner / beam splitter, which coincides with the intersection of the output light path of the polarity conversion device; the light beams output by the optical splitter device are incident on each polarity conversion device one by one.

[0047] One of the two groups of optical reflective lenses is composed of at least two or more reflective lenses.

[0048] The polarity conversion device which forms a transmission relationship with the beam combiner / beam splitter outputs a beam, such as Figure 4 and Figure 5 As shown, when the beam combiner has a 45-degree reflective characteristic, a transmission relationship with the beam combiner / beam splitter will appear at a 45-degree angle; when the beam combiner has a 40-70-degree reflective characteristic, a transmission relationship with the beam combiner / beam splitter will appear at a 40-70-degree angle.

[0049] Two independently controlled light beams are formed, one for completing laser drilling, and the other laser uses a plano-convex cylindrical mirror 10 to converge the circular spot of the laser into a linear long spot, and the rotation of the drum is used to form a laser scanning and cleaning of the drum surface.

[0050] Example 2

[0051] Devices that use laser polarity conversion to achieve multi-path laser drilling, such as Figure 2 , Figure 2.1 and 6 As shown, including:

[0052] A laser 1, used for emitting a single-channel laser;

[0053] A beam splitter or deflection device 2 is placed in the laser output light path to split the single laser beam into two independent laser beams;

[0054] A laser 1, used for emitting a single-channel laser;

[0055] A beam splitter or deflection device 2 is placed in the laser output light path to split the single laser beam into two independent laser beams;

[0056] Two sets of polarity conversion devices 3 are respectively placed in the optical paths of two independent laser beams to deflect the two laser beams into parallel polarized light beams and vertical polarized light beams respectively; the polarity conversion devices are composed of two sets of optical reflective lenses.

[0057] The polarity conversion device includes two groups of optical reflective lenses, wherein the output light of one group forms a transmission relationship with the beam combiner / beam splitter, and the output light of the other group forms a reflection relationship with the beam combiner / beam splitter; the incident light forming the reflection relationship and its reflected light form a plane, and the polarization direction of the incident light is perpendicular to the plane (vertical polarization). The polarization direction of the incident light forming the transmission relationship is parallel to the plane (parallel polarization). The surfaces formed by the two groups of polarity conversion devices 3 are plane 1 and plane 2, wherein plane 2 intersects with plane 1, but the intersection line of the two is parallel to the beam combiner.

[0058] The output light of one polarity conversion device and the reflected light of the beam combiner / beam splitter form a plane, and converge with the output light of the polarity conversion device of another optical path at a point on the incident surface of the beam combiner / beam splitter, which coincides with the intersection of the output light path of the polarity conversion device; the light beams output by the optical splitter device are incident on each polarity conversion device one by one.

[0059] One of the two groups of optical reflective lenses is composed of at least two or more reflective lenses.

[0060] The polarity conversion device which forms a transmission relationship with the beam combiner / beam splitter outputs a beam, such as Figure 4 and Figure 5 As shown, when the beam combiner has a 45-degree reflective characteristic, a transmission relationship with the beam combiner / beam splitter will appear at a 45-degree angle; when the beam combiner has a 40-70-degree reflective characteristic, a transmission relationship with the beam combiner / beam splitter will appear at a 40-70-degree angle.

[0061] Figure 2 Shows The incident light constituting the reflection relationship forms a plane with its reflected light, and the polarization direction of the incident light is perpendicular to the plane; the polarization direction of the incident light constituting the transmission relationship is parallel to the plane;

[0062] Figure 2.1 The incident light constituting the reflection relationship and its reflected light form a plane, and the polarization direction of the incident light is parallel to the plane; the incident light constituting the transmission relationship has a polarization direction perpendicular to the plane.

[0063] Example 3

[0064] A device that uses laser polarity conversion to achieve multi-path or multi-area laser drilling. Figure 3 As shown, including:

[0065] A laser 1 is used for emitting a single-channel laser, and the laser is a CO2 type pulsating laser with a wavelength of 9.6-11.6 microns.

[0066] A beam splitter or deflection device 2 is placed in the laser output light path to split the single laser beam into two independent laser beams;

[0067] Two sets of polarity conversion devices 3 are respectively placed in the optical paths of two independent laser beams to deflect the two laser beams into horizontally polarized light beams and vertically polarized light beams respectively; the polarity conversion devices are composed of two sets of optical reflective lenses.

[0068] The incident light of two different polarization directions from the polarity conversion device is combined by the beam combiner (parallel polarization beam is transmitted, and vertical polarization beam is reflected) for transmission, and then separated by the beam splitter (parallel polarization beam is transmitted, and vertical polarization beam is reflected).

[0069] Using two independently controlled beams, one beam completes the laser drilling of one area, and the other beam completes the laser drilling of another area. Two independently controlled beams can complete the drilling of different parts of the same cigarette, or the same part of different cigarettes.

[0070] After the above-mentioned embodiment is applied, the technical solution can be used to use one laser to complete the punching of different parts of the same cigarette, or the same part of different cigarettes, and independently control the punching time and punching intensity; or one laser can be used to complete the punching of cigarettes while another light is used to clean the surface of the drum wheel, preferably a linear light spot.

[0071] When the linear spot laser irradiates the rotating drum surface, due to the large difference in the absorption of laser energy of this wavelength between metal materials and materials such as scale, dust, tar, etc., the laser energy is absorbed by materials such as scale, dust, tar, etc., causing burning or gasification, so that materials such as scale, dust, tar, etc. are separated from the surface of the perforated drum and the drum is kept clean. The greater the laser energy and the longer the duration, the better the cleaning effect, and independently controlled lasers can meet this demand well.

[0072] The device does not require any changes to the main structure. It only needs to adjust the focusing lens group and rotate the focusing lens group axially to the scaling area of ​​the drum to achieve the technical effect of cleaning the drum while drilling.

[0073] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A device for laser drilling and laser cleaning by laser polarity conversion, placed between the laser output light path and the cigarette adsorbed on the drilling drum, characterized in that: include: An optical splitter, placed in the laser output light path, for splitting a single laser beam into at least two independent laser beams; A polarity conversion device is placed in the optical path of each independent laser beam separated by the optical splitting device, and is used to change the laser to a preset polarization direction and then converge at one point; The beam combining lens is placed at the convergence point of the light emitted by the polarity conversion device, and is used to combine the two independent laser beams into one beam after deflection; The beam splitter is placed in the outgoing light path of the beam combiner to separate lasers with different polarization directions; The focusing device is placed in the output light path of the beam splitter, and is used to guide the laser to different areas on the same punched cigarette to achieve multi-area punching, or to guide the laser to the punching drum to clean the scale on the surface of the punching drum while punching.

2. The device for laser drilling and laser cleaning using laser polarity conversion according to claim 1, characterized in that: The polarity conversion device comprises two groups of optical reflective lenses, wherein the output light of one group forms a transmission relationship with the beam combiner / beam splitter, and the output light of the other group forms a reflection relationship with the beam combiner / beam splitter; the optical relationship adopts any one of the following: The incident light constituting the reflection relationship forms a plane with its reflected light, and the polarization direction of the incident light is perpendicular to the plane; the polarization direction of the incident light constituting the transmission relationship is parallel to the plane; Alternatively, the incident light forming the reflection relationship forms a plane with its reflected light, and the polarization direction of the incident light is parallel to the plane; the incident light forming the transmission relationship has a polarization direction perpendicular to the plane.

3. The device for laser drilling and laser cleaning using laser polarity conversion according to claim 2, characterized in that: The output light of one polarity conversion device and the reflected light of the beam combiner / splitter form a plane, and converge with the output light of the other optical path polarity conversion device at a point on the incident surface of the beam combiner / splitter, and the point coincides with the intersection of the output light path of the polarity conversion device; The light beams outputted by the optical splitting device are incident on each polarization conversion device one by one.

4. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 2, characterized in that: The optical reflecting lenses of one of the two polarity conversion devices are composed of at least two or more reflecting lenses.

5. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 2, characterized in that: The polarity conversion device outputs a light beam that forms a transmission relationship with the beam combiner / beam splitter. When the beam combiner has a 45-degree reflection characteristic, a transmission relationship with the beam combiner / beam splitter will appear at a 45-degree angle; when the beam combiner has a 40-70-degree reflection characteristic, a transmission relationship with the beam combiner / beam splitter will appear at a 40-70-degree angle.

6. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 1, characterized in that: The laser is a CO2 type pulsating laser with a wavelength of 9.6-11.6 microns.

7. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 6, characterized in that: The perforated drum is made of a metal material having a relatively low absorption rate to the laser energy of the above wavelength.

8. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 1, characterized in that: The laser used to clean the scaled area of ​​the perforated drum irradiates the drum surface after passing through a focusing device, and the light spot is one of the following shapes: O-shaped, square, or linear.

9. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 8, characterized in that: The light spot is a linear spot after being focused by a cylindrical lens.

10. The device for laser drilling and laser cleaning by laser polarity conversion according to claim 9, characterized in that: The linear spot length is 7-10 mm and the width is 0.5-3 mm.

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