Label-free marking apparatus

Abstract

Disclosed in the present invention is a label-free marking apparatus, comprising a frame, a disc-shaped conveying module, a laser marking module, and a first driving module. The disc-shaped conveying module is separately connected to a feeding device and a discharging device; packaging bottles enter the disc-shaped conveying module from the feeding device, complete label printing on the disc-shaped conveying module, and then are returned to a conveyor by means of the discharging device; the laser marking module comprises a plurality of laser heads; the plurality of laser heads are distributed along the circumference of the disc-shaped conveying module, are arranged on the disc-shaped conveying module, can move along with the disc-shaped conveying module, and mark the packaging bottles at corresponding positions; and the first driving module has an output end connected to the disc-shaped conveying module and can drive the disc-shaped conveying module to rotate. The label-free marking apparatus has clearer formed marks and a higher marking speed, better meets production requirements, has a better marking effect and a more stable marking process, is more convenient to adjust and maintain, is easier to change marking content and sizes, is not prone to malfunctions, and has low maintenance and production costs.

Description

Labelless marking equipment Technical Field

[0001] The present invention relates to the technical field of packaging bottle identification printing equipment, in particular to a label-free marking device. Background Art

[0002] At present, existing packaging bottles are equipped with adhesive labels (with numbers, text, LOGO, name, QR code, barcode, DM code, information logo, etc.) in the middle of the bottle body. The packaging bottles are currently recycled after use, but the labels on the packaging bottles need to be removed during recycling, which wastes a lot of manpower and material resources. After the labels are removed, the label adhesive will remain on the bottle body, which will produce harmful objects during processing and has low energy-saving and environmental protection value.

[0003] In line with the development philosophy of carbon reduction and environmental protection, the concept of "labelless PET bottles" has emerged in the past two years, and many leading companies have already begun preemptive planning to address energy conservation and carbon reduction efforts. Instead of labels bearing brand logos and product information, these bottles are now laser-printed. Removing the labels reduces plastic use during production, simplifies recycling materials, and reduces the number of recycling steps. However, existing labelless PET bottles can only be laser-marked with minimal information, with complete product information only being printed on the outer packaging. This makes individual bottle sales impossible, limits sales channels, and fails to meet the demands of large-format, high-capacity production.

[0004] The patent application document with publication number CN116967618A discloses automatic production equipment for label-free packaging bottles, which includes a frame, which is provided with a bottle conveying device and a bottle marking device. The bottle marking device includes a rotating shaft arranged on the frame and an active ring disk fixed coaxially with the rotating shaft. The frame is provided with a driving mechanism for driving the rotating shaft to rotate. A plurality of placement plates are rotatably arranged on the top of the active ring disk. The plurality of placement plates are distributed in a circular array along the circumference of the active ring disk. A self-rotating motor is provided at the bottom of the active ring disk for driving the respective placement plates to rotate. A follower ring disk is coaxially fixed on the rotating shaft. The follower ring disk is provided with a downward pressure component arranged corresponding to the placement plate. The frame is provided with a plurality of laser heads for bottle marking. However, this device has the following shortcomings: 1) The laser head used for marking does not move with the active ring disk, but is mounted on a frame. This results in a limited rotation speed, significantly reducing overall marking efficiency. 2) As the laser head marks the bottle, the rotation of the active ring disk can easily cause slight deformation of the mark, resulting in poor marking results. 3) The downward pressure assembly uses a pneumatic cylinder to press or release the bottle, which is prone to failure over time and is also expensive. Therefore, further upgrades are urgently needed. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a label-free marking device connected to an external conveying device, which includes a conveyor, a feeding device and a discharging device; including:

[0006] frame;

[0007] The disc-shaped conveying module is connected to the feeding device and the discharging device respectively. The packaging bottles enter the disc-shaped conveying module from the feeding device, and after the labels are printed on the disc-shaped conveying module, they return to the conveyor through the discharging device;

[0008] The laser marking module includes a plurality of laser heads, which are distributed along the circumference of the disc-shaped conveying module and are arranged on the disc-shaped conveying module. The laser heads can move with the disc-shaped conveying module and mark the packaging bottles at the corresponding positions;

[0009] The first driving module has an output end connected to the disc-shaped conveying module and can drive the disc-shaped conveying module to rotate.

[0010] Specifically, the disc-shaped conveying module includes: a first rotating shaft, a first cam plate, a pair of first fixing frames, a first driving turntable, a first following plate, a plurality of first pressing mechanisms and a plurality of storage plates;

[0011] The first rotating shaft is connected to the output end of the first driving module;

[0012] The first cam disc is sleeved on the first rotating shaft and does not rotate with the first rotating shaft, and the outer ring of the first cam disc is provided with a first cam track;

[0013] A pair of first fixing frames are respectively arranged on both sides of the first cam disc and connected to the first cam disc, and are used to fix the first cam disc;

[0014] The first follower disk and the first active turntable are sequentially sleeved on the first rotating shaft and can rotate along with the rotating shaft; a plurality of placement trays are provided on the first active turntable for placing bottles;

[0015] The first follower plate is provided with a first pressing mechanism corresponding to a plurality of storage plates one by one; a first pulley is provided on one side of the first pressing mechanism, and is slidably connected to the first cam plate through a first cam track, and can move up and down while moving along the circumference of the first cam plate, for tightening or loosening the bottle body.

[0016] Furthermore, a corresponding rotating motor is provided under each storage tray, and the rotating motor can drive the corresponding storage tray to rotate.

[0017] Furthermore, the first pressing mechanism comprises: a first pressing assembly and a pair of first guide rods;

[0018] A pair of first guide rods are provided on the first follower plate;

[0019] The first pressing assembly is sleeved on a pair of first guide rods and can slide along the pair of first guide rods;

[0020] The first pulley is arranged on one side of the first pressing component and is slidably connected to the first cam disc through the first cam track. It can move up and down while moving along the circumference of the first cam disc.

[0021] Furthermore, the first pressing mechanism further comprises: a pair of first springs and a pair of clamping springs;

[0022] A pair of first springs are respectively sleeved on the pair of first guide rods;

[0023] A pair of clamping springs respectively correspond to the pair of first springs one by one, are respectively arranged at the lower ends of the corresponding pair of first springs, and are fixedly connected to the first guide rod;

[0024] The first spring is arranged between the first pressing assembly and the clamping spring.

[0025] Furthermore, the first pressing assembly comprises: a first sliding frame, a first pressing rod and a first pressing sleeve;

[0026] The first sliding frame is sleeved on a pair of first guide rods, and the first pulley is arranged on one side of the first sliding frame;

[0027] One end of the first lower pressing rod is connected to the first sliding frame, and the other end is movably connected to the first pressing sleeve. The first pressing sleeve can rotate around its own axis.

[0028] Furthermore, the first pressing mechanism further includes: a first fixing plate, which is arranged on the upper ends of the pair of first guide rods and fixedly connected to the pair of first guide rods.

[0029] Furthermore, the laser marking module further comprises: a second cam plate, a plurality of lifting mechanisms, a second follower plate and a plurality of laser head controllers;

[0030] The second cam disc is fixedly connected to the first cam disc via a plurality of connecting columns, and a second cam track is provided on the outer ring of the second cam disc;

[0031] The second follower disk is fixedly connected to the first follower disk through a plurality of connecting columns and can move synchronously with the first follower disk;

[0032] A plurality of lifting mechanisms are respectively connected to a plurality of laser heads, and a second pulley is provided on one side of each lifting mechanism. The second pulley is slidably connected to the second cam disc through a second cam track, and can move up and down while moving along the circumference of the second cam disc;

[0033] The plurality of laser head controllers correspond to the plurality of laser heads one by one and are arranged on the second follower disk.

[0034] Furthermore, the lifting mechanism includes: a second sliding frame and a pair of second guide rods;

[0035] The second sliding frame is sleeved on a pair of second guide rods and can slide relative to the pair of second guide rods; the second pulley is arranged on one side of the second sliding frame and can drive the second sliding frame to move;

[0036] A pair of second guide rods are fixedly connected to the first follower plate.

[0037] Furthermore, the lifting mechanism further comprises: a second fixing plate and a pair of second springs;

[0038] The second fixing plate is arranged at the upper ends of the pair of second guide rods and is fixedly connected to the pair of second guide rods;

[0039] A pair of second springs are respectively arranged at two ends of the second fixing plate, one end of the second spring is connected to the second fixing plate, and the other end is connected to the second sliding frame.

[0040] Furthermore, a position adjustment mechanism is provided between the lifting mechanism and the corresponding laser head, and the position between the lifting mechanism and the corresponding laser head can be adjusted by the position adjustment mechanism.

[0041] Furthermore, the first driving module includes: a first driving motor and a transmission gear set; the first driving motor drives the first rotating shaft, the feeding device and the discharging device to move synchronously through the transmission gear set.

[0042] Furthermore, it also includes: a first detection camera and a second detection camera; the first detection camera is arranged on the side of the connection between the feeding device and the disc-shaped conveying module, and is used to detect whether the bottle body enters the disc-shaped conveying module; the second detection camera is arranged on the side of the connection between the discharging device and the disc-shaped conveying module, and is used to detect whether there is a relevant mark on the bottle body.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1) The laser head moves synchronously with the disc-shaped conveying module, making the marking clearer and faster;

[0045] 2) The pressing assembly and the first cam plate are matched and adopt mechanical transmission, which is not prone to failure and low in cost;

[0046] 3) The lifting mechanism is used to make the laser head move better and at a lower cost.

[0047] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of a perspective view according to an embodiment of the present invention;

[0049] Figure 2 is a front view of Figure 1;

[0050] FIG3 is a schematic diagram of a first partial perspective view according to an embodiment of the present invention;

[0051] FIG4 is an enlarged view of FIG3 in the direction A;

[0052] FIG5 is a schematic diagram of a lifting mechanism according to an embodiment of the present invention;

[0053] FIG6 is a top view of FIG3;

[0054] FIG7 is a schematic diagram of a second partial perspective view according to an embodiment of the present invention;

[0055] FIG8 is an enlarged view of FIG7 in the direction B;

[0056] FIG9 is a schematic diagram of a first pressing mechanism according to an embodiment of the present invention;

[0057] FIG10 is a left side view of FIG7;

[0058] FIG11 is an enlarged view of FIG10 along the C direction;

[0059] FIG12 is a schematic diagram of the shape of a first cam track or a second cam track according to an embodiment of the present invention;

[0060] FIG13 is a schematic diagram showing the fixed connection between the first cam plate and a pair of first fixing frames according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to further illustrate the present invention.

[0062] First, a label-free marking device according to an embodiment of the present invention will be described with reference to Figures 1 to 13. The device is used for marking bottles and has a wide range of application scenarios.

[0063] As shown in Figures 1 to 13, the label-free marking device of the embodiment of the present invention is connected to the external conveying device 1, which includes a conveyor 11, a feeding device 12 and a discharging device 13; including:

[0064] Rack 2;

[0065] The disc-shaped conveying module 3 is connected to the feeding device 12 and the discharging device 13 respectively. The packaging bottles enter the disc-shaped conveying module 3 from the feeding device 12, and after the labels are printed on the disc-shaped conveying module 3, they return to the conveyor 11 through the discharging device 13;

[0066] The laser marking module 4 includes a plurality of laser heads 41. The laser heads 41 are distributed along the circumference of the disc-shaped conveying module 3 and are arranged on the disc-shaped conveying module 3. The laser heads 41 can move with the disc-shaped conveying module 3 and mark the packaging bottles at the corresponding positions, with good marking effect and fast marking speed.

[0067] The first driving module 5 has an output end connected to the disc-shaped conveying module 3 and can drive the disc-shaped conveying module 3 to rotate.

[0068] Specifically, as shown in Figures 2 to 3, 6 to 8, and 10 to 13, in this embodiment, the disc-shaped conveying module 3 includes: a first rotating shaft 31, a first cam plate 32, a pair of first fixing frames 33, a first driving turntable 34, a first follower plate 35, a plurality of first pressing mechanisms 36, and a plurality of storage trays 37;

[0069] The first rotating shaft 31 is connected to the output end of the first driving module 5;

[0070] The first cam plate 32 is sleeved on the first rotating shaft 31 and does not rotate with the first rotating shaft 31 . A first cam track 321 is provided on the outer ring of the first cam plate 32 .

[0071] A pair of first fixing frames 33 are respectively disposed on both sides of the first cam disc 32 and connected to the first cam disc 32 for fixing the first cam disc 32;

[0072] The first follower disk 35 and the first active turntable 34 are sequentially mounted on the first rotating shaft 31 and can rotate along with the rotating shaft; a plurality of placement trays 37 are provided on the first active turntable 34 for placing bottles;

[0073] The first follower plate 35 is provided with a first pressing mechanism 36 corresponding to the plurality of storage plates 37 one by one; a first pulley 361 is provided on one side of the first pressing mechanism 36, and is slidably connected to the first cam plate 32 through a first cam track 321. It can move up and down while moving along the circumference of the first cam plate 32 to compress or loosen the bottle body; the first pressing mechanism 36 and the first cam track 321 cooperate with each other, and the transmission effect is good and it is not easy to malfunction.

[0074] Furthermore, as shown in Figures 3 and 11, in this embodiment, a rotation motor 38 is correspondingly provided under each storage tray 37. The rotation motor 38 can drive the corresponding storage tray 37 to rotate. During the marking process of the laser head 41, the bottle body can be rotated according to the marking needs.

[0075] Further, as shown in Figures 8 and 9, in this embodiment, the first pressing mechanism 36 includes: a first pressing assembly 362 and a pair of first guide rods 363;

[0076] A pair of first guide rods 363 are provided on the first follower plate 35;

[0077] The first pressing assembly 362 is sleeved on the pair of first guide rods 363 and can slide along the pair of first guide rods 363;

[0078] The first pulley 361 is disposed on one side of the first pressing assembly 362 and is slidably connected to the first cam plate 32 via the first cam track 321 , and can move up and down while moving along the circumference of the first cam plate 32 .

[0079] Further, as shown in Figures 8 and 9, in this embodiment, the first pressing mechanism 36 further includes: a pair of first springs 364 and a pair of clamping springs 365;

[0080] A pair of first springs 364 are respectively mounted on the pair of first guide rods 363;

[0081] A pair of clamping springs 365 respectively correspond to the pair of first springs 364 one by one, are respectively provided at the lower ends of the corresponding pair of first springs 364, and are fixedly connected to the first guide rod 363;

[0082] The first spring 364 is disposed between the first pressing assembly 362 and the retaining spring 365 . The first spring 364 is used for buffering the first pressing assembly 362 and assisting the first pressing assembly 362 in resetting.

[0083] Further, as shown in Figures 8 and 9, in this embodiment, the first pressing assembly 362 includes: a first sliding frame 3621, a first pressing rod 3622 and a first pressing sleeve 3623;

[0084] The first sliding frame 3621 is sleeved on a pair of first guide rods 363 , and the first pulley 361 is arranged on one side of the first sliding frame 3621 ;

[0085] One end of the first pressing rod 3622 is connected to the first sliding frame 3621, and the other end is movably connected to the first pressing sleeve 3623. The first pressing sleeve 3623 can rotate around its own axis, so that when the rotating motor 38 drives the storage tray 37 to rotate, the bottle body can follow the movement better.

[0086] Furthermore, as shown in Figures 8~9, in this embodiment, the first pressing mechanism 36 also includes: a first fixing plate 366, which is arranged at the upper end of a pair of first guide rods 363 and fixedly connected to the pair of first guide rods 363; on the one hand, it makes the structure of the pair of first guide rods 363 more stable, and on the other hand, it is used to limit the position of the first sliding frame 3621.

[0087] Furthermore, as shown in Figures 1 to 5, in this embodiment, the laser marking module 4 further includes: a second cam plate 42, a plurality of lifting mechanisms 43, a second follower plate 44 and a plurality of laser head controllers 45;

[0088] The second cam disc 42 is fixedly connected to the first cam disc 32 via a plurality of connecting posts, and a second cam track 421 is provided on the outer ring of the second cam disc 42;

[0089] The second follower disk 44 is fixedly connected to the first follower disk 35 through a plurality of connecting posts and can move synchronously with the first follower disk 35;

[0090] The plurality of lifting mechanisms 43 are connected to the plurality of laser heads 41 in a one-to-one correspondence. A second pulley 431 is provided on one side of each lifting mechanism 43. The second pulley 431 is slidably connected to the second cam disc 42 via a second cam track 421 and can move up and down while moving in a circular motion along the second cam disc 42.

[0091] The laser head controllers 45 correspond to the laser heads 41 one by one, respectively, and are disposed on the second follower disk 44 .

[0092] Further, as shown in Figures 1 to 5, in this embodiment, the lifting mechanism 43 includes: a second sliding frame 432 and a pair of second guide rods 433;

[0093] The second sliding frame 432 is mounted on a pair of second guide rods 433 and can slide relative to the pair of second guide rods 433; the second pulley 431 is disposed on one side of the second sliding frame 432 and can drive the second sliding frame 432 to move;

[0094] A pair of second guide rods 433 are fixedly connected to the first follower plate 35 .

[0095] Furthermore, the lifting mechanism 43 further comprises: a second fixing plate 434 and a pair of second springs 435;

[0096] The second fixing plate 434 is arranged at the upper end of the pair of second guide rods 433 and is fixedly connected to the pair of second guide rods 433 ; on the one hand, it makes the structure of the pair of second guide rods 433 more stable; on the other hand, it is used to limit the position of the second sliding frame 432 .

[0097] A pair of second springs 435 are respectively provided at both ends of the second fixed plate 434, one end of the second spring 435 is connected to the second fixed plate 434, and the other end is connected to the second sliding frame 432; the second spring 435 is provided to buffer the second sliding frame 432 and assist in resetting the second sliding frame 432; on the other hand, it gives the second sliding frame 432 an upward pulling force, so that the pressure between the second pulley 431 and the upper wall of the second cam track 421 is almost 0, which greatly reduces the friction between the second pulley 431 and the upper wall of the second cam track 421 during movement.

[0098] Furthermore, as shown in FIG5 , in this embodiment, a position adjustment mechanism 46 is provided between the lifting mechanism 43 and the corresponding laser head 41 , and the position between the lifting mechanism 43 and the corresponding laser head 41 can be adjusted by the position adjustment mechanism 46 so that the laser head 41 is in the optimal marking position.

[0099] Further, as shown in FIG10 , in this embodiment, the first driving module 5 includes: a first driving motor and a transmission gear set; the first driving motor drives the first rotating shaft 31 , the feeding device 12 and the discharging device 13 to move synchronously through the transmission gear set.

[0100] Furthermore, as shown in Figures 3 and 6, in this embodiment, it also includes: a first detection camera 61 and a second detection camera 62; the first detection camera 61 is arranged on the side of the connection between the feeding device 12 and the disc-shaped conveying module 3, and is used to detect whether the bottle body enters the disc-shaped conveying module 3; the second detection camera 62 is arranged on the side of the connection between the discharging device 13 and the disc-shaped conveying module 3, and is used to detect whether there is a relevant mark on the bottle body.

[0101] Furthermore, as shown in FIG. 12 , in this embodiment, the first cam track 321 and the second cam track 421 have similar shapes and structures.

[0102] Working principle: First, the bottle body enters the storage tray 37 of the disc-shaped conveying module 3 from the feeding device 12. At this time, the first pressing component 362 follows the first pulley 361 from the high point of the first cam track 321 to the low point, so that the first pressing sleeve 3623 presses the bottle body; then the laser head 41 at the corresponding position of the bottle body follows the second pulley 431 from the high point of the second cam track 421 to the low point, and begins to mark the bottle body; after the bottle body is marked during the movement, the first pressing component 362 follows the first pulley 361 from the low point of the first cam track 321 to the high point, and the laser head 41 at the corresponding position of the bottle body follows the second pulley 431 from the low point of the second cam track 421 to the high point, and the bottle body is discharged from the discharging device 13 and returned to the conveyor 11; this is done for each bottle body.

[0103] The above describes the label-free marking equipment according to an embodiment of the present invention with reference to Figures 1 to 13. The laser head moves synchronously with the disc-shaped conveying module, the printed mark is clearer, and the marking speed is faster; the pressing component and the first cam disc cooperate with each other and adopt mechanical transmission, which is not prone to failure and low in cost; the lifting mechanism is adopted to make the laser head follow better and the cost is lower.

[0104] It should be noted that, in this specification, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the elements.

[0105] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A label-free marking device connected to an external conveying device, wherein the external conveying device comprises a conveyor, a feeding device and a discharging device; characterized in that: Include: frame; A disc-shaped conveying module, wherein the disc-shaped conveying module is connected with the feeding device and the discharging device respectively, and the packaging bottles enter the disc-shaped conveying module from the feeding device, and return to the conveyor through the discharging device after the label printing is completed on the disc-shaped conveying module; A laser marking module, wherein the laser marking module comprises a plurality of laser heads, which are distributed along the circumference of the disc-shaped conveying module and are arranged on the disc-shaped conveying module, and can move with the disc-shaped conveying module and mark the packaging bottles at corresponding positions; A first driving module, wherein an output end of the first driving module is connected to the disc-shaped conveying module and can drive the disc-shaped conveying module to rotate; The disc-shaped conveying module comprises: a first rotating shaft, a first cam plate, a pair of first fixing frames, a first active rotating plate, a first follower plate, a plurality of first pressing mechanisms and a plurality of storage plates; The first rotating shaft is connected to the output end of the first driving module; The first cam disc is sleeved on the first rotating shaft and does not rotate with the first rotating shaft, and the outer ring of the first cam disc is provided with a first cam track; The pair of first fixing frames are respectively arranged on both sides of the first cam plate and connected to the first cam plate, and are used to fix the first cam plate; The first follower disk and the first active rotating disk are sequentially sleeved on the first rotating shaft and can rotate along with the rotating shaft; The first active turntable is provided with a plurality of storage trays for placing bottles; The first follower plate is provided with a first pressing mechanism corresponding to the plurality of storage plates one by one; a first pulley is provided on one side of the first pressing mechanism, and is slidably connected to the first cam plate through the first cam track, and can move up and down while moving along the circumference of the first cam plate, so as to press or loosen the bottle body; The laser marking module further comprises: a second cam plate, a plurality of lifting mechanisms, a second follower plate and a plurality of laser head controllers; The second cam disc is fixedly connected to the first cam disc via a plurality of connecting columns, and a second cam track is arranged on the outer ring of the second cam disc; The second follower disk is fixedly connected to the first follower disk through a plurality of connecting columns and can move synchronously with the first follower disk; The plurality of lifting mechanisms correspond to and are connected to the plurality of laser heads one by one, and a second pulley is provided on one side of each lifting mechanism. The second pulley is slidably connected to the second cam disc through the second cam track, and can move up and down while moving along the circumference of the second cam disc; The plurality of laser head controllers correspond to the plurality of laser heads one by one, respectively, and are arranged on the second follower disk; The lifting mechanism comprises: a second sliding frame and a pair of second guide rods; The second sliding frame is sleeved on the pair of second guide rods and can slide relative to the pair of second guide rods; the second pulley is arranged on one side of the second sliding frame and can drive the second sliding frame to move; The pair of second guide rods are fixedly connected to the first follower plate; The lifting mechanism further comprises: a second fixing plate and a pair of second springs; The second fixing plate is arranged at the upper ends of the pair of second guide rods and is fixedly connected to the pair of second guide rods; The pair of second springs are respectively arranged at two ends of the second fixing plate, one end of the second spring is connected to the second fixing plate, and the other end is connected to the second sliding frame.

2. The label-free marking device according to claim 1, characterized in that: The first pressing mechanism comprises: a first pressing assembly and a pair of first guide rods; The pair of first guide rods are arranged on the first follower plate; The first pressing assembly is sleeved on the pair of first guide rods and can slide along the pair of first guide rods; The first pulley is arranged at one side of the first pressing assembly and is slidably connected to the first cam plate through the first cam track, and can move up and down while moving along the circumference of the first cam plate.

3. The label-free marking device according to claim 2, characterized in that: The first pressing mechanism further comprises: a pair of first springs and a pair of clamping springs; The pair of first springs are respectively sleeved on the pair of first guide rods; The pair of clamping springs respectively correspond to the pair of first springs one by one, are respectively arranged at the lower ends of the corresponding pair of first springs, and are fixedly connected to the first guide rod; The first spring is arranged between the first pressing component and the clamping spring.

4. The label-free marking device according to claim 2 or 3, characterized in that: The first pressing assembly comprises: a first sliding frame, a first pressing rod and a first pressing sleeve; The first sliding frame is sleeved on the pair of first guide rods, and the first pulley is arranged on one side of the first sliding frame; One end of the first pressing rod is connected to the first sliding frame, and the other end is movably connected to the first pressing sleeve, and the first pressing sleeve can rotate around its own axis.

5. The label-free marking device according to claim 2 or 3, characterized in that: The first pressing mechanism further includes: a first fixing plate, which is disposed at the upper ends of the pair of first guide rods and fixedly connected to the pair of first guide rods.

6. The label-free marking device according to claim 1, characterized in that: A position adjustment mechanism is provided between the lifting mechanism and the corresponding laser head, and the position between the lifting mechanism and the corresponding laser head can be adjusted by the position adjustment mechanism.

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