Novel lossless punching device for rod-shaped object

Abstract

The invention discloses a novel lossless hole punching device for rod-shaped objects. The novel lossless hole punching device comprises a pair of drum-shaped wheels for adsorbing double-length rod-shaped objects through suction grooves. A rotating device used for stirring the double-length rod-shaped object to rotate by 360 degrees is arranged between the pair of drum-shaped wheels, the pitch of the penetrating hole area is n times that of the rod-shaped object in the suction grooves in the surfaces of the drum-shaped wheels, and n is equal to 2-3; the rotating device comprises a cam fixedly provided with a curve groove, a plurality of swing arms slide in the curve groove through small shafts at one ends, sector gears are arranged at the other ends of the swing arms, rotating pin shafts are arranged in the connecting areas of the swing arms and the sector gears, the rotating pin shafts are rotationally fixed to the side face of the drum-shaped wheel through bearings, and the tooth face of the sector gear is meshed with a small gear. The pinion and the suction groove are coaxially fixed, and the suction groove is rotationally fixed in the mounting holes of the pair of drum-shaped wheels; compared with a punching scheme in one pitch, the technical scheme has the advantages that the rotating speed of the suction groove can be reduced by 50%-75%, the precision of a bearing required by transmission is reduced, and the design difficulty is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of laser drilling, and in particular relates to a novel non-destructive hole drilling device for a rod-shaped object. Background Art

[0002] A search revealed that Chinese patent document 99125910.6 discloses a static connection between a punching wheel and a front and rear feeding and discharging device. During the connection, the rod-shaped object 16 is adsorbed in the suction groove 152 and does not rotate. When the suction groove drives the rod-shaped object into the vicinity of the punching hole area, the suction groove starts to rotate and accelerate, so that the rod-shaped object completes a 360° rotation within one pitch. During this period, a beam tracking device including a driver 10 and a rotating reflector 6 is used to synchronously track the rod-shaped object with a laser beam, and after being focused by a fixed focusing mirror, a hole is punched in the rod-shaped object. It can be seen that in this scheme, the rod-shaped object is statically joined and therefore has a low failure rate. However, although this technical scheme can achieve the punching of rod-shaped objects, since it adopts a tracking scheme in which a parallel moving light beam is set on the outer side of the drum wheel, the focal points of the punching are distributed in a straight line, and the rod-shaped object moves in an arc along the drum wheel, so a change in the focusing height causes defocusing. In order to reduce the impact of defocusing, the area in which the hole is punched must be as short as possible, that is, the punching must be completed within a pitch of less than or equal to one, otherwise the movement of the rod-shaped object will produce a large defocus and cause the punching to fail. In this way, the suction groove absorbs the rod-shaped object and completes a 360° rotation within a pitch less than or equal to one pitch. At this time, according to the production speed of 6000-7000 pieces per minute of the high-speed machine, the rotation speed of the rod-shaped object reaches 3000-3500rpm (double length strip). Since the suction groove must absorb the rod-shaped object, the suction groove must have an asymmetric groove structure. The asymmetric groove structure will produce huge dynamic imbalance when rotating at such a high speed. Therefore, although inertia compensation, lightweight materials and other methods can be used to reduce dynamic imbalance, it is impossible to fundamentally solve the problem of dynamic imbalance, thereby causing large vibration, large noise, and easy damage to the transmission. According to the experimental situation of the inventor, the highest speed of the suction nozzle with an asymmetric structure that can work stably for a long time should be less than or equal to 30rps and 1800RPM. In addition, the rod-shaped object runs along the arc of the drum wheel within one pitch, so for the focused beam, the focal length changes, and defocusing occurs, which also affects the stability and accuracy of the hole punching.

[0003] The inventor's authorized Chinese patent 201980006365.6 discloses a method of using a rotating prism set near the center of a drum wheel, in which a rod-shaped object is adsorbed on a suction groove and revolves with the drum wheel, and at the same time rotates around the axis of the rod-shaped object, and uses the beam scanned by the prism to track the rod-shaped object. It is a technical solution in which a drum wheel and a front and rear feeding and discharging device are dynamically connected and a divergent beam near the center of the drum wheel is used for tracking. The characteristic of this technical solution is that the laser beam can rotate at a large angle to track the movement of the rod-shaped object, and each suction groove is provided with an independent shaping and focusing lens so that the focusing is accurate. However, in this solution, the rod-shaped object must always spin at a constant speed. In order to achieve a smooth dynamic connection with the front and rear feeding and discharging devices, the rod-shaped object must use the lowest possible suction groove rotation speed. Therefore, a large hole punching area must be set, generally 1 / 3-1 / 2 of the circumference of the drum wheel, 180-120° area, in which the rod-shaped object completes a 360° rotation. It can be seen that although this solution is feasible, it has the following problems: 1. 1 / 2-1 / 3 of the drum wheel area is used for perforation, so the dust pollution area caused by perforation is large, and it is not conducive to the long-term stable operation of the equipment if it is not collected and removed in a centralized manner. If the perforation is set in the 60-90° range as described in the manual, the suction groove drives the rod-shaped object to run around the drum wheel for one circle, and it must rotate around its own central axis 6-4 times, that is, the smaller the perforation area is set, the higher the spin speed. During the handover, the speed difference between the suction nozzle and the feeding and discharging device is too large, which is easy to clamp cigarettes, damage cigarettes, and even completely fail to hand over. 2. While the rod-shaped object is running around the drum wheel, it always rotates around the central axis of the suction groove, which is a dynamic handover method with the front and rear feeding and discharging devices, which is easy to clamp and damage the rod-shaped object and cause it to fall. 3. After increasing the perforation area to 120°-180°, the corresponding scanning angle of each reflective mirror surface also increases to (60-90°), so the incident light beam must be shaped into a linear beam to reduce the size of the prism reflection surface, and then restored to a circular spot through reverse shaping. Therefore, several shaping mirrors make the internal space of the drum wheel smaller and more crowded, and optical debugging is more difficult, while also increasing the cost of production. 4. The use of shaping mirrors destroys the characteristics of the laser beam, causing the perforation performance to decline when focusing, affecting the perforation quality.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a novel device for non-destructively punching holes in rod-shaped objects, thereby overcoming the above-mentioned defects in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a novel non-destructive hole-piercing device for rod-shaped objects, which is arranged between a feeding device and a discharging device, and includes a pair of drum wheels that absorb double-length rod-shaped objects through suction grooves; a rotating device for rotating the double-length rod-shaped objects 360° is arranged between the pair of drum wheels, and the hole-piercing area is n times the pitch of the rod-shaped object in the suction groove on the surface of the drum wheel, wherein n=2-3 (one pitch of the drum wheel is the distance between a number of suction grooves for rod-shaped objects evenly distributed on the circumference of the drum wheel); the rotating device includes a cam fixedly provided with a curved groove, a number of swing arms slide in the curved groove through a small shaft at one end, a fan gear is arranged at the other end of the swing arm, a rotating pin is arranged in the connection area between the swing arm and the fan gear, the rotating pin is rotatably fixed to the side of the drum wheel through a bearing, the tooth surface of the fan gear is meshed with the pinion, the pinion is coaxially fixed with the suction groove, and the suction groove is rotatably fixed in the mounting holes of the pair of drum wheels; The curved grooves of the cam are respectively a perforation curve, a holding curve-1, a reset curve, and a holding curve-2 which are connected in circumferential sequence; the circumference corresponding to the perforation curve corresponds to the perforation area, and when the small shaft at the end of the swing arm runs in the groove of the perforation curve, the swing arm drives the fan gear to rotate 30°-90° in the forward direction around the rotating pin shaft; when the small shaft at the end of the swing arm runs in the groove of the reset curve, the swing arm drives the fan gear to rotate 30°-90° in the reverse direction around the rotating pin shaft; the length of the arc line of the fan-shaped tooth surface of the fan gear is slightly larger than the circumference of the small gear. With this arrangement, the swing arm drives the fan gear to rotate so that the suction groove completes the perforation and reset of 360° in the forward or reverse direction around the center line of the rod-shaped object.

[0007] In this way, the perforation area is set to n times the pitch of the rod-shaped object of the suction groove on the surface of the drum wheel, where n=2-3, that is, the suction groove drives the rod-shaped object to rotate 360° within the above 2-3 pitches. At this time, according to the production speed of 6000-7000 pieces per minute of the high-speed machine, the rotation speed of the double-length rod-shaped object is 1 / 2-1 / 3 of (3000-3500) rpm, which is less than 1800 rpm, so the suction groove of this scheme can work stably for a long time.

[0008] At the same time, the scanning angle corresponding to the prism reflection surface is reduced to (n*α / 2), and the angle change range is small when the reflection surface rotates. Therefore, the size change of the incident light spot on the reflection mirror surface is small, and no shaping is required.

[0009] Preferably, in the above technical solution, the perforation curve is a groove, and the circumferential angle length of the groove corresponds to the circumferential angle length corresponding to the perforation hole area. At this time, the tooth surface of the sector gear meshes with the pinion of the suction groove and generates relative displacement, and the suction groove drives the rod-shaped object to rotate 360° to complete the perforation; Curve-1 is maintained when the suction groove drives the rod-shaped object to complete the perforation. At this time, the tooth surface of the fan gear and the pinion gear of the suction groove maintain a relatively static meshing, so that the groove of the suction groove always faces the intersection point of the discharge device, so that the rod-shaped object is transferred from the suction groove to the discharge device; The reset curve is: the tooth surface of the sector gear and the pinion of the suction groove keep meshing and produce relative displacement, and the suction groove drives the rod-shaped object to rotate 360° in the opposite direction of the perforation curve, so as to perform the rotation perforation of the next rod-shaped object again; Curve-2 is maintained so that after the suction groove drives the rod-shaped object to complete the reverse rotation, the groove of the suction groove always faces the intersection point of the feeding device, so that the rod-shaped object is transferred from the feeding device to the suction groove.

[0010] Such arrangement enables the suction groove of the drum wheel to maintain a relatively static state with the drum wheel when the suction groove of the drum wheel is in contact with the feeding and discharging devices for the rod-shaped object.

[0011] With such arrangement, the suction groove of the drum wheel in this case remains relatively still with the drum wheel when it is connecting with the feeding and discharging devices for rod-shaped objects, and thus also remains relatively still with the feeding and discharging devices, so that the rod-shaped objects will not be misaligned, squeezed, damaged or dropped when they are connected.

[0012] Preferably, the above technical solution also includes a plurality of focusing mirrors and a prism scanning device, wherein the plurality of focusing mirrors are mounted on an annular bracket on the inner side of the drum wheel, and the focusing mirrors rotate synchronously with the suction groove of the drum wheel. The prism scanning device is arranged at the rotation axis of the annular bracket within the circumference of the drum wheel, and is used to reflect the laser light emitted by an external laser to the focusing mirror at a specific workstation, and the laser light focused by the focusing mirror is projected onto the double-long rod-shaped object in the corresponding suction groove.

[0013] Preferably, in the above technical solution, a pair of drum wheels are driven by respective independent transmission devices and rotate synchronously around the same central axis, and an annular bracket equipped with a focusing mirror is fixedly arranged to rotate with one side of the drum wheel or driven to rotate synchronously by an independent bracket and transmission device.

[0014] Preferably, in the above technical solution, the prism scanning device is composed of a prism bracket, a prism transmission device and a reflecting prism, the reflecting prism has a plurality of reflecting surfaces, and the rotating axis of the prism scanning device is parallel to the central axis and located on one side of the central axis.

[0015] The rotation axis of the prism scanning device is either arranged parallel to the reflection surface of the prism, or forms an angle of 45° with the projection of the rotation axis on the reflection surface.

[0016] Preferably, in the above technical solution, one pitch of the drum wheel is the distance between a number of rod-shaped object suction grooves evenly distributed on the circumference of the drum wheel, which corresponds to a circumferential angle of α, and the n pitches corresponding to the perforated area (the number of rod-shaped object intervals n within the perforated range) correspond to a circumferential angle of n*α (40°-90°), and the number of perforations is N; Each prism reflection surface needs to complete the scanning of n*α circular angle: Scan angle = (n*α) / 2, The scanning angle of the C-face prism reflector is 360 / C. So: 360 / C = (n*α) / 2, The reflecting surface of the prism is C=720 / (n*α).

[0017] Preferably, in the above technical solution, n = 2. This arrangement reduces the mutual interference between the sector gears and the adjacent sector gears, reduces the implementation difficulty and reduces the manufacturing cost.

[0018] Compared with the prior art, the present invention has the following beneficial effects: In this technical solution, when the rod-shaped object is handed over to the front and rear feeding and discharging devices, the suction groove is in a static state, so the handover efficiency is high and there will be no falling or damage; In this technical solution, a prism scanning device is arranged at the central axis, and the output laser beam is divergent to track the running trajectory of the rod-shaped object, so that the rod-shaped object is always located at the focal length of the focusing lens; This technical solution adopts a solution of completing the perforation within the range of 2-3 pitches. Compared with the perforation solution within 1 pitch, it can reduce the rotation speed of the suction groove by 50%-75%, and can realize the suction groove to work within the speed range of 20-25rps, reducing the dynamic imbalance during rotation, small vibration, low noise, reducing the precision of the bearing required for transmission, and reducing the difficulty of design; In this technical solution, the number of faces of the prism is 8-18, which reduces the rotation speed of the prism transmission device, is conducive to improving the tracking accuracy, and also reduces the purchase cost of the transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1a , Figure 1b , Figure 1c Schematic diagram of different positions of the prism scanning device in this embodiment.

[0020] Figure 1d Schematic diagram for setting the axis of rotation or parallel to the reflecting surface of the prism.

[0021] Figure 2 and Figure 3 The figure is a schematic diagram of the working of the rotating device. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] The present invention is a novel non-destructive hole punching device for rod-shaped objects, comprising a feeding device, a discharging device, a punching device, and a laser light source. The punching device comprises inner and outer drum wheels that allow double-length rod-shaped objects to be adsorbed in inner and outer suction grooves and run around the central axis. The inner and outer drum wheels are symmetrically provided with inner and outer rotating devices that allow double-length rod-shaped objects to rotate 360° around their own central axis when passing through the punching area. The punching area is n times the pitch of the rod-shaped object in the suction groove on the surface of the drum wheel, where n=2-3; 1 pitch corresponds to a circumferential angle of α, and n pitches corresponding to punching correspond to a circumferential angle of n*α; To complete the scanning of n*α circular angle corresponding to a prism reflection surface, it is necessary to: Scan angle = (n*α) / 2, The scanning angle of the C-face prism reflector is 360 / C. So: 360 / C = (n*α) / 2, The reflection surface of the prism is C = 720 / (n*α), When the drum wheel has 16 grooves distributed around its circumference, α=22.5°. When n=2, C=360 / α=16, When n=3, C=240 / α=10, When the drum wheel has 12 grooves distributed around its circumference, α=30°, When n=2, C=360 / α=12, When n=3, C=240 / α=8, The reflecting surface of the prism is C=8-18.

[0025] A plurality of inner and outer focusing mirrors are respectively mounted on annular brackets arranged concentrically with the inner and outer drum-shaped wheels, and each inner and outer focusing mirror corresponds to the inner and outer suction grooves of the inner and outer drum-shaped wheels and rotates synchronously; A prism scanning device is provided between the inner and outer drum-shaped wheels. The prism scanning device is provided in the two outgoing light paths of the laser light source. The two laser beams emitted through the reflecting mirror surface of the prism scanning device are located near the central axis and are focused on the surfaces of the double-length rod-shaped objects in the inner and outer suction grooves respectively through the corresponding inner and outer focusing lenses. The drum wheels on both sides are driven by independent inner and outer transmission devices and rotate synchronously around the same central axis. The annular bracket equipped with inner and outer focusing mirrors is coaxial with the central axes of the inner and outer drum wheels and rotates synchronously, or is fixed to the inner drum wheel, or fixed to the outer drum wheel, or is driven by an independent bracket and transmission device.

[0026] The prism scanning device is composed of a prism bracket, a prism transmission device and a reflecting prism. The reflecting prism has a plurality of reflecting surfaces. The rotating axis of the prism scanning device is parallel to the central axis and is located on one side of the central axis.

[0027] The rotation axis is set parallel to the reflecting surface of the prism ( Figure 1d ), or a 45° angle with the projection of the rotation axis on the reflection surface ( Figure 1a , b, c).

[0028] The inner and outer rotating devices are composed of a fixed cam with a curved groove, the curved groove of the cam divides the circumference of the cam into at least 4 sections, and a plurality of small shafts running in the curved groove and arranged at the end of the swing arm. The other end of the swing arm is provided with a rotating pin shaft and connected to a fan gear. The rotating pin shaft is rotatably fixed on the side surfaces of the inner and outer drum wheels. The tooth surface of the fan gear is meshed with the small gear. The small gear is coaxially fixed with the suction groove. The suction groove is rotatably fixed in the mounting holes of the inner and outer drum wheels.

[0029] Please refer to Figure 2 and Figure 3 The cam has four curved grooves, which are composed of a perforation curve, a holding curve-1, a reset curve, and a holding curve-2.

[0030] The perforation curve is a groove, the circumferential angle length of the groove is consistent with the circumferential angle length corresponding to the perforation hole area, so that the suction groove drives the rod-shaped object to rotate 360° to complete the perforation; Keep curve -1 to ensure that after the suction groove drives the rod-shaped object to complete the perforation, the groove of the suction groove always faces the intersection point of the discharge device, so that the rod-shaped object is transferred from the suction groove to the discharge device; The reset curve is to make the suction groove drive the rod-shaped object to rotate 360° in the opposite direction to the perforation curve, so as to perform the rotation perforation of the next rod-shaped object again; Curve-2 is maintained so that after the suction groove drives the rod-shaped object to complete the reverse rotation, the groove of the suction groove always faces the intersection point of the feeding device, so that the rod-shaped object is transferred from the feeding device to the suction groove; When the small shaft runs in the groove of the perforation curve, it drives the swing arm to drive the fan gear to rotate 45°-90° in the forward direction around the rotating pin shaft. When the small shaft runs in the groove of the reset curve, it drives the swing arm to drive the fan gear to rotate 45°-90° in the reverse direction around the rotating pin shaft. The length of the arc line of the fan-shaped tooth surface of the fan gear is slightly larger than the circumference of the small gear. With this arrangement, the swing arm drives the fan gear to rotate so that the suction groove can rotate 360° in the forward or reverse direction around the center line of the rod-shaped object.

[0031] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A novel non-destructive hole-piercing device for rod-shaped objects, arranged between a feeding device and a discharging device, comprising a pair of drum wheels for sucking double-length rod-shaped objects through suction grooves; a rotating device for rotating the double-length rod-shaped objects 360° is arranged between the pair of drum wheels, characterized in that: The hole area is n times the pitch of the rod-shaped object in the suction groove on the surface of the drum wheel, where n=2-3; the rotating device includes a cam fixedly provided with a curved groove, a plurality of swing arms slide in the curved groove through a small shaft at one end, a fan gear is provided at the other end of the swing arm, a rotating pin is provided in the connection area between the swing arm and the fan gear, the rotating pin is rotatably fixed to the side of the drum wheel through a bearing, the tooth surface of the fan gear is meshed with the small gear, the small gear is coaxially fixed with one end of the suction groove, and the suction groove is rotatably fixed in a pair of mounting holes of the drum wheel; The curved grooves of the cam are respectively a perforation curve, a holding curve-1, a reset curve, and a holding curve-2 which are connected in circumferential sequence; the circumference corresponding to the perforation curve corresponds to the perforation area, and when the small shaft at the end of the swing arm runs in the groove of the perforation curve, the swing arm drives the fan gear to rotate 30°-90° in the forward direction around the rotating pin shaft; when the small shaft at the end of the swing arm runs in the groove of the reset curve, the swing arm drives the fan gear to rotate 30°-90° in the reverse direction around the rotating pin shaft; the length of the arc line of the fan-shaped tooth surface of the fan gear is slightly larger than the circumference of the small gear; with this arrangement, the swing arm drives the fan gear to rotate so that the suction groove completes perforation and reset of 360° in the forward or reverse direction around the center line of the rod-shaped object.

2. The novel non-destructive hole-piercing device for rod-shaped objects according to claim 1 is characterized in that: The perforation curve is a groove, the circumferential angle length of the groove corresponds to the circumferential angle length of the perforation hole area, at this time, the tooth surface of the sector gear meshes with the pinion of the suction groove and generates relative displacement, and the suction groove drives the rod-shaped object to rotate 360° to complete the perforation; The holding curve -1 is that after the suction groove drives the rod-shaped object to complete the perforation, the tooth surface of the fan gear and the pinion gear of the suction groove maintain a relatively static meshing, so that the groove of the suction groove always faces the intersection point of the discharge device, so that the rod-shaped object is transferred from the suction groove to the discharge device; The reset curve is as follows: the tooth surface of the sector gear and the pinion of the suction groove keep meshing and produce relative displacement, and the suction groove drives the rod-shaped object to rotate 360° in the opposite direction of the perforation curve, so as to perform rotation perforation of the next rod-shaped object again; The holding curve-2 is that after the suction groove drives the rod-shaped object to complete the reverse rotation, the groove of the suction groove always faces the intersection point of the feeding device, so that the rod-shaped object is transferred from the feeding device to the suction groove.

3. The novel non-destructive hole-piercing device for rod-shaped objects according to claim 1 is characterized in that: The pair of drum wheels are driven by independent transmission devices and rotate synchronously around the same central axis. The annular bracket with the focusing mirror is fixedly arranged to rotate with one side of the drum wheel or driven by an independent bracket and transmission device to rotate synchronously.

4. The novel non-destructive hole-piercing device for rod-shaped objects according to claim 1 is characterized in that: It also includes a plurality of focusing mirrors and a prism scanning device. The plurality of focusing mirrors are mounted on an annular bracket on the inner side of the drum wheel. The focusing mirrors rotate synchronously with the suction groove of the drum wheel. The prism scanning device is arranged at the rotation axis of the annular bracket within the circumference of the drum wheel and is used to reflect the laser light emitted by an external laser to the focusing mirror at a specific workstation. The laser light focused by the focusing mirror is projected onto the double-long rod-shaped object in the corresponding suction groove.

5. The novel non-destructive hole-piercing device for rod-shaped objects according to claim 4 is characterized in that: The prism scanning device is composed of a prism bracket, a prism transmission device and a reflecting prism. The reflecting prism has a plurality of reflecting surfaces. The rotating axis of the prism scanning device is parallel to the central axis and is located on one side of the central axis. The rotation axis of the prism scanning device is either arranged parallel to the reflection surface of the prism, or forms an angle of 45° with the projection of the rotation axis on the reflection surface.

6. The novel non-destructive hole-piercing device for rod-shaped objects according to claim 5 is characterized in that: One pitch of the drum wheel is the distance between a number of rod-shaped object suction grooves evenly distributed on the circumference of the drum wheel, which corresponds to a circumferential angle of α. The n pitches corresponding to the perforated area correspond to a circumferential angle of n*α of 40°-90°, and the number of perforations is N; Each prism reflection surface needs to complete the scanning of n*α circular angle: Scan angle = (n*α) / 2, The scanning angle of the C-face prism reflector is 360 / C. So: 360 / C = (n*α) / 2, The reflecting surface of the prism is C=720 / (n*α).

7. The novel non-destructive hole-piercing device for rod-shaped objects according to claim 1 or 6, characterized in that: n=2。

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