Laser perforation device with double focusing units

Abstract

The laser perforating device is characterized in that a central shaft is connected with a power unit, a drum-shaped rotating wheel and a large gear are mounted at two ends of the central shaft in a mirror symmetry manner, and a positioning groove is formed in the side part of the drum-shaped rotating wheel; cams are fixed in spaces at two ends of the central shaft, and each cam comprises a reverse backswing curve section and a forward reset curve section. The swing arm is connected to the side face of the drum-shaped rotating wheel through a rotating pin shaft, and a small shaft of the swing arm slides in a cam groove to obtain deflection power. The rotary suction nozzle device is installed at the far end of the swing arm in a sliding mode, absorbs the thin rod and revolves along with the drum-shaped rotating wheel, and when the cam drives the swing arm, the rotary suction nozzle device enables the thin rod to rotate by the theta angle. The double focusing units are arranged at corresponding positions according to the cam structure, and the control unit controls the two focusing units to simultaneously or alternately perforate a specific area of the thin rod according to the cam structure and the backswing times. A positioning small shaft is arranged on the side face of the rotary suction nozzle device parallel to the center shaft and can slide in a positioning groove, and it is ensured that the focusing distance between the thin rod and the focusing unit is constant when the cam drives the swing arm and the rotary suction nozzle device to swing back.

Description

Technical Field

[0001] The invention belongs to the technical field of cigarette processing, and in particular relates to a laser perforating device with a double focusing unit. Background Art

[0002] The inventor proposed a design scheme in Chinese patent CN202010147626 that uses a cam mechanism to control the movement of the swing arm. The scheme aims to ensure that the rotating nozzle moves on a specific trajectory through mechanical linkage, thereby improving processing accuracy and efficiency. However, in actual application, this design exposes some potential technical problems.

[0003] Specifically, in the above-mentioned patent design, a sliding device controlled by a spring is installed at the end of the swing arm. The purpose is to ensure that the swing arm can move smoothly and accurately drive the rotating nozzle to work under the drive of the cam. However, in the actual operating environment, the elastic characteristics of the spring will change due to long-term use, which may cause the movement trajectory of the swing arm to deviate. In addition, external factors such as the intrusion of dust and other impurities may also cause the sliding device to become blocked, further interfering with the normal operation of the swing arm. These problems will eventually lead to deviations in the spatial positioning of the rotating nozzle, and it cannot be ensured that the nozzle can return to the preset position after each swing back.

[0004] Once the position of the rotating nozzle is offset, the most direct impact is the relative distance between the nozzle and the processing object, especially for those application scenarios that require extremely high focal length accuracy, such as laser drilling or fine engraving. In this case, the focusing accuracy of the laser beam will be seriously affected, which may lead to problems such as inconsistent apertures on the surface of the workpiece and unclear edges. In severe cases, it will increase the scrap rate and increase production costs.

[0005] Therefore, how to overcome the above-mentioned defects in the prior art and provide a more stable and reliable rotating nozzle device has become an urgent problem to be solved. Summary of the invention

[0006] The object of the present invention is to provide a laser perforating device with a double focusing unit, so as to overcome the above-mentioned defects in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides a laser perforating device with a dual focusing unit, including a central axis connected to a power unit; characterized in that: it also includes a drum-shaped rotating wheel and a large gear installed at both ends of the central axis in mirror symmetry, and a positioning groove is arranged on the side of the drum-shaped rotating wheel; a cam is fixed at both ends of the central axis, with a reverse swing curve segment β and a forward reset curve segment α; the swing arm is connected to the side of the drum-shaped rotating wheel through a rotating pin shaft, and slides in the cam groove through a small shaft to form a deflection; a rotating suction nozzle device is installed at the far end of the swing arm, used to adsorb a thin rod, and revolves with the drum-shaped rotating wheel; when the cam drives the swing arm to swing back or reset, the rotating suction nozzle device causes the thin rod to rotate by an angle θ; the dual focusing units are configured at corresponding positions according to different cam structures; the control unit controls the two focusing units to alternately perforate specific areas of the thin rod according to the cam structure and the number of swings.

[0008] Further preferably, a circle of grooves is provided on the circumference of the cam, and the grooves include at least one reverse swing curve segment with a circumferential angle β and at least one positive reset curve segment with a circumferential angle α, preferably α=β; the arm body of the swing arm is rotatably set on the side of the drum-shaped rotating wheel through a rotating pin, and one end of the swing arm is a small shaft, which rolls in the groove of the cam to drive the swing arm to swing back and reset; the rotating suction nozzle device includes a small gear, a sliding bracket, a positioning small shaft and an arc groove, and a thin rod is adsorbed in the arc groove. When the swing arm swings back or resets, the positioning small shaft on the sliding bracket runs in the positioning groove, so that the small gear can roll along the surface of the large gear and keep the radial height of the arc groove constant, thereby keeping the focal length constant during punching.

[0009] Further preferably, the two focusing units are respectively arranged on the outer side and the inner side of the radial circumference of the drum-shaped rotating wheel or the large gear, at positions corresponding to the relative static point of the spatial position formed when the reverse curve segment of the cam drives the swing arm to swing in the opposite direction. At this time, the circumference of the cam only contains a groove of a forward curve segment and a reverse curve segment; when the small shaft at one end of the swing arm runs to the groove of the reverse curve segment of the cam, the swing arm drives the rotating suction nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and maintains a static spatial position. During this period, the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating suction nozzle to rotate by an angle θ.

[0010] Further preferably, the two focusing units are simultaneously arranged on the outer side of the circumference of the drum-shaped rotating wheel or the large gear, at positions corresponding to the relative still points of two spatial positions formed when the reverse curve segment of the cam drives the swing arm to swing in the opposite direction. At this time, the circumference of the cam includes grooves of two positive curve segments and two reverse curve segments; when the small shaft at one end of the swing arm runs to the two reverse curve segment grooves of the cam, the swing arm drives the rotating suction nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and maintains a stationary spatial position. During this period, the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating suction nozzle to rotate by an angle θ.

[0011] More preferably, the angle θ is between 180° and 200°.

[0012] Further preferably, the rotating suction nozzle device consists of a sliding bracket and a transmission shaft, a pinion and an arc groove installed on the sliding bracket. The transmission shaft, the pinion and the arc groove are coaxially rotatably arranged on the sliding bracket. The sliding bracket is provided with a positioning pinion which cooperates with the positioning groove for radial positioning of the sliding bracket.

[0013] Further preferably, the small positioning shaft is located on the side of the sliding bracket, or the small positioning shaft is coaxially arranged with the transmission shaft and runs in the positioning groove of the positioning flange.

[0014] Further preferably, the swing arm is slidably and rotationally connected to the sliding bracket via a connecting unit at one end, wherein the connecting unit is a bidirectional sliding pair having X and Y axial directions, and the circumferential positioning and radial positioning of the sliding bracket are jointly determined by the connecting unit and the positioning groove.

[0015] Further preferably, the positioning flange rotates along with the drum-shaped rotating wheel.

[0016] Further preferably, the groove of the cam comprises at least one pair of reverse curves of a circumferential angle α and a positive curve of a circumferential angle β, and the reverse curve and the positive curve, as well as a group of curves formed by the reverse curve of the circumferential angle α and the positive curve of the circumferential angle β, are directly connected, or are connected through a groove of a retaining section.

[0017] After the implementation of this case, it brings the following advantages: 1. The use of a crank cam or a fan-shaped wheel to drive the nozzle rotating device to indirectly drive the cigarette to rotate, avoiding the rotation damage to the appearance of the cigarette caused by the direct effect of the mechanical dial wheel in the traditional cigarette punching solution; 2. The laser defocusing phenomenon caused by the change of the center height of the cigarette caused by the swing of the eccentrically arranged swing arm in the comparison scheme is improved, and the accuracy of laser focusing is improved; 3. The sliding device can be arranged inside the space of the drum-shaped rotating wheel, which avoids the blockage, hysteresis, lubrication failure and other situations caused by the dust generated by laser drilling, thereby ensuring the high precision of the rotating nozzle transmission; BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1a and Figure 1b Schematic diagram of two optional installation positions of the dual focusing unit; Figure 2a and Figure 2b Schematic diagram of positioning the small shaft in different positions; Figure 3a and Figure 3bSchematic diagram of different connection structures of the sliding bracket; Figure 4a and Figure 4b It is a schematic diagram of the structure of the cam groove. Specific embodiments Example 1

[0019] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0020] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0021] A laser perforating device with a dual focusing unit, comprising: A central shaft, the central shaft being drivingly connected to the power unit; A drum-shaped rotating wheel and a large gear, which are sleeved on the central shaft and are in driving connection with the central shaft; Cam and swing arm, the cam is rotatably sleeved at both ends of the central axis and fixedly installed in space, the cam circumference includes at least one positive curve segment corresponding to the circumferential angle β and at least one reverse curve segment corresponding to the circumferential angle α, the swing arm is rotatably arranged on the side of the drum-shaped rotating wheel through a rotating shaft pin, one end of the swing arm is a small shaft, the small shaft rolls in the groove to drive the swing arm to swing back and reset, the reverse curve is a curved groove that allows the swing arm to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and / or the large gear, and the positive curve is a curved groove that allows the swing arm to reset in the same direction as the running direction of the drum-shaped rotating wheel and / or the large gear; A positioning flange, the positioning flange is coaxially sleeved on the central axis with the drum-shaped rotating wheel, a positioning groove is provided on the side circumference of the positioning flange, and the positioning flange either rotates coaxially with the drum-shaped rotating wheel or is fixed in space; A rotating nozzle device, wherein the rotating nozzle device is rotatably mounted in a sliding bracket at the end of a swing arm; a transmission shaft of the rotating nozzle device is provided with a small gear, and the small gear is meshed with the large gear. When the swing arm is driven by the positive curve segment and the reverse curve segment of the cam, so that the relative position of the rotating nozzle device and the drum-shaped rotating wheel or the large gear changes, the small gear rolls on the surface of the large gear, thereby driving the transmission shaft and the rotating nozzle to rotate or reversely rotate around its own axis, and the rotation angle of the rotation or reverse rotation is θ, θ=(180-270)°, so that the rotation speed of the rotating nozzle is reduced; The rotary suction nozzle device is provided with a small positioning shaft, which is slidably arranged in the positioning groove of the positioning flange, so that when the swing arm swings around the rotating shaft pin, the radial position of the rotary suction nozzle device in the drum-shaped rotating wheel and the large gear remains stable; A thin rod, which is adsorbed in the arc groove of the rotating nozzle and moves along the circumference of the drum-shaped rotating wheel driven by the swing arm; A dual focusing unit, the dual focusing unit consisting of two focusing units (focusing unit-1 and focusing unit-2), Or they are respectively arranged on the outer side and inner side of the radial circumference of the drum-shaped rotating wheel or the large gear, at positions corresponding to the relative static point of the spatial position formed when the reverse curve segment of the cam drives the swing arm to swing in the opposite direction. At this time, the circumference of the cam only contains a groove of a positive curve segment and a reverse curve segment; when the small shaft at one end of the swing arm runs to the groove of the reverse curve segment of the cam, the swing arm drives the rotating suction nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and keep the spatial position still, during which the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating suction nozzle to rotate by an angle θ; Or they are all arranged on the outer side of the circumference of the drum-shaped rotating wheel or the large gear, at the position corresponding to the relative static points of two spatial positions formed when the reverse curve segment of the cam drives the swing arm to swing in the opposite direction. At this time, the circumference of the cam includes grooves with two positive curve segments and two reverse curve segments; when the small shaft at one end of the swing arm runs to the two reverse curve segment grooves of the cam, the swing arm drives the rotating suction nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and keep the spatial position still, during which the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating suction nozzle to rotate by an angle θ; A control unit, wherein the control unit controls the focusing unit-1 to complete the perforation of a 180° area of ​​the thin rod circumference during the period when the thin rod rotates by an angle of θ, and at the same time, the focusing unit-2 completes the perforation of another 180° area of ​​the thin rod circumference symmetrically; In this way, the thin rod can be perforated within a 360° circumference while reducing the rotation speed of the rotating nozzle device. Further preferably, θ=(180°-200°); The rotating nozzle device is composed of a sliding bracket, a transmission shaft, a pinion and an arc groove installed on the sliding bracket. The transmission shaft, the pinion and the arc groove are coaxially rotatably arranged on the sliding bracket. The sliding bracket is provided with a positioning pinion which cooperates with the positioning groove for radial positioning of the sliding bracket. The positioning small shaft is either located on the side of the sliding bracket or is coaxially arranged with the transmission shaft and runs in the positioning groove of the positioning flange; The swing arm is connected to the sliding bracket by sliding and rotating with the sliding shaft at one end, and the connecting unit is a bidirectional sliding pair with X and Y axial directions, and the circumferential positioning and radial positioning of the sliding bracket are determined by the connecting unit and the positioning groove; The positioning flange preferably rotates with the drum-shaped rotating wheel, so that when the small shaft of the swing arm is not located in the groove of the positive curve section and the reverse curve section of the cam, the friction and wear between the small shaft and the groove of the cam can be reduced; The groove of the cam contains at least one pair of reverse curves of the circumferential angle α and positive curves of the circumferential angle β. The reverse curve and the positive curve, as well as a group of curves formed by the reverse curve of the circumferential angle α and the positive curve of the circumferential angle β, are either directly connected or connected through a groove of a retaining section.

Claims

1. A laser perforating device with a dual focusing unit, comprising a central axis connected to a power unit; characterized in that: It also includes a drum-shaped rotating wheel and a large gear installed at both ends of the central axis in a mirror-symmetrical manner, and a positioning groove is arranged on the side of the drum-shaped rotating wheel; the cam space is fixedly located at both ends of the central axis, and has a reverse swing curve segment β and a forward reset curve segment α; the swing arm is connected to the side of the drum-shaped rotating wheel through a rotating pin shaft, and slides in the cam groove through a small shaft to form a deflection force; a rotating suction nozzle device is slidably installed at the far end of the swing arm, used to absorb the thin rod, and revolves with the drum-shaped rotating wheel; when the cam drives the swing arm to swing back or reset, the rotating suction nozzle device rotates the thin rod by an angle of θ; the dual focusing units are configured at corresponding positions according to different cam structures; the control unit controls the two focusing units to punch specific areas of the thin rod simultaneously or alternately according to the cam structure and the number of swings; A small positioning shaft is also provided on the side of the rotating suction nozzle device parallel to the central axis. The small positioning shaft can slide in the positioning groove. The positioning groove is a section of an arc groove or a complete circular groove. The origin of the arc groove or the circular groove coincides with the circle of the central axis. When the cam drives the swing arm and the rotating suction nozzle device to swing back, and the rotating suction nozzle device slides along the swing arm, the focusing distance between the swinging motion and the rotating thin rod and the focusing unit can be kept constant.

2. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: A circle of grooves is provided on the circumference of the cam, and the grooves include at least one reverse swing curve segment with a circumferential angle β and at least one positive reset curve segment with a circumferential angle α, preferably α=β; the arm body of the swing arm is rotatably arranged on the side of the drum-shaped rotating wheel through a rotating pin shaft, and one end of the swing arm is a small shaft, which rolls in the groove of the cam to drive the swing arm to swing back and reset; the rotating suction nozzle device includes a small gear, a sliding bracket, a positioning small shaft and an arc groove, and a thin rod is adsorbed in the arc groove. When the swing arm swings back or resets, the positioning small shaft on the sliding bracket runs in the positioning groove, so that the small gear can roll along the surface of the large gear, thereby driving the rotation of the thin rod and keeping the radial height of the arc groove constant, thereby keeping the focal length constant during punching.

3. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: The two focusing units are respectively arranged on the outer side and the inner side of the radial circumference of the drum-shaped rotating wheel or the large gear, at the positions corresponding to the relative static point of the spatial position formed when the reverse curve segment of the cam drives the swing arm to swing in the reverse direction. At this time, the circumference of the cam only includes a groove of a positive curve segment and a reverse curve segment; when the small shaft at one end of the swing arm runs to the groove of the reverse curve segment of the cam, the swing arm drives the rotating suction nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and keep the spatial position still. During this period, the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating suction nozzle to rotate by an angle θ.

4. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: The two focusing units are simultaneously arranged on the outer side of the circumference of the drum-shaped rotating wheel or the large gear, at positions corresponding to the relative static points of two spatial positions formed when the reverse curve segment of the cam drives the swing arm to swing in the opposite direction. At this time, the circumference of the cam includes two grooves of positive curve segments and at least one reverse curve segment located at different radial positions of the cam; when the small shaft at one end of the swing arm runs to the first reverse curve segment groove of the cam, the swing arm drives the rotating nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and keep the spatial position still, during which the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating nozzle to rotate by an angle of θ. Then the small shaft at one end of the swing arm continues to run to the second reverse curve segment groove of the cam, and the swing arm drives the rotating nozzle device to swing in the opposite direction of the running direction of the drum-shaped rotating wheel and the large gear and keep the spatial position still, during which the drum-shaped rotating wheel and the large gear continue to rotate, so that the large gear drives the small gear to rotate and then drives the rotating nozzle to continue to rotate by an angle of θ.

5. The laser perforating device with a dual focusing unit according to claim 1 or 3, characterized in that: The angle θ is between 180° and 200°.

6. The laser perforating device with a dual focusing unit according to claim 1 or 4, characterized in that: The angle θ is 180°.

7. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: The rotary suction nozzle device consists of a sliding bracket and a transmission shaft, a pinion and an arc groove installed on the sliding bracket. The transmission shaft, the pinion and the arc groove are coaxially rotatably arranged on the sliding bracket. The sliding bracket is provided with a positioning pinion which cooperates with the positioning groove for radial positioning of the sliding bracket.

8. The laser perforating device with a dual focusing unit according to claim 3, characterized in that: The small positioning shaft is located on the side of the sliding bracket, or the small positioning shaft is coaxially arranged with the transmission shaft and runs in the positioning groove of the positioning flange.

9. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: The swing arm is slidably and rotatably connected to the sliding bracket via a connecting unit at one end. The connecting unit is a bidirectional sliding pair with X and Y axial directions. The circumferential positioning and radial positioning of the sliding bracket are determined by the connecting unit and the positioning groove.

10. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: The positioning flange rotates following the drum-shaped rotating wheel.

11. The laser perforating device with a dual focusing unit according to claim 1, characterized in that: The groove of the cam contains at least one pair of reverse curves of the circumferential angle α and positive curves of the circumferential angle β. The reverse curve and the positive curve, as well as a group of curves formed by the reverse curve of the circumferential angle α and the positive curve of the circumferential angle β are directly connected, or are connected through a groove of a retaining section.

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