Label-less marking equipment

Abstract

To provide a label-less marking facility in a technical field of a label printing device of a packaging bottle.SOLUTION: The label-less marking facility includes a frame, a disk-shaped conveying module, a laser marking module 4, and a first driving module, wherein the disk-shaped conveying module is connected to each of a supply device and an ejection device, and packaging bottles enter the disk-shaped conveying module through the supply device, and after label printing is completed on the disk-shaped conveying module, the packaging bottles return to a conveyor through the ejection device, and the laser marking module includes a plurality of laser heads 41 so that the plurality of laser heads are distributed along a circumference of the disk-shaped conveying module and are provided on the disk-shaped conveying module so as to mark the packaging bottles at a corresponding position while moving along the disk-shaped conveying module, and an output end of the first driving module is connected to the disk-shaped conveying module, and is capable of moving and rotating the disk-shaped conveying module.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of label printing devices for packaging bottles, and more particularly to label-less marking equipment. [Background technology]

[0002] Currently, existing packaging bottles have adhesive labels (bearing signs such as numbers, letters, logos, names, QR codes (registered trademarks), bar codes, DM codes, and information logos) attached to the center. These packaging bottles are recycled after use, but recycling requires the label on the packaging bottle to be peeled off, which requires a large amount of manpower and material effort. Furthermore, peeling off the label leaves the label adhesive on the bottle, which generates harmful substances during processing and plays a small role in energy conservation and environmental protection.

[0003] In line with the development ideals of low-carbon and environmental protection, the "label-less PET bottle" concept has emerged over the past two years, with several major companies beginning to plan ahead for energy-saving and low-carbon initiatives. That is, instead of attaching a label bearing the brand logo or product information to the bottle itself, the label is printed on the bottle using laser printing technology. By eliminating the label, plastic use in the production process is reduced, recycling materials are simplified, and the recycling process is shortened. However, existing label-less PET bottles can only print a small amount of information on the bottle itself using a laser, with full product information printed only on the outer packaging. This limits individual bottle sales, restricts sales channels, and significantly hinders the demand for high-capacity production.

[0004] The patent application with publication number CN116967618A discloses an automatic label-less packaging bottle production equipment, which includes a frame on which a bottle body conveying device and a bottle body marking device are mounted. The bottle body marking device includes a rotating shaft provided on the frame and a driving ring disc fixed coaxially with the rotating shaft. The frame is provided with a driving mechanism for driving the rotation of the rotating shaft. A plurality of storage trays are rotatably mounted on the top of the driving ring disc, and the storage trays are distributed in a circumferential array around the periphery of the driving ring disc. A rotating motor is provided at the bottom of the driving ring disc for driving the rotation of each storage tray. A driven ring disc is fixed coaxially with the rotating shaft. The driven ring disc is provided with a lower pressing assembly corresponding to the storage tray. The frame is provided with a plurality of laser heads for marking the bottle bodies. However, this equipment has the following drawbacks: 1) the marking laser head does not move with the driving ring disk but is mounted on the frame, which means that the rotation speed of the driving ring disk is not too fast, resulting in a significant reduction in the overall marking efficiency; 2) while the laser head is marking the bottle body, the rotation of the driving ring disk tends to slightly deform the marked logo, resulting in poor logo printing effect; 3) the lower pressing assembly uses a cylinder drive to press and release the bottle body, which is prone to malfunction with prolonged use, and the cost of adopting a cylinder drive is high, so further upgrades are required. Summary of the Invention [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a label-less marking equipment, which is connected to an external transport device including a conveyor, a feeding device and a discharging device, and further includes: A frame is provided. The conveyor has a disc-shaped conveying module, and the disc-shaped conveying module is connected to a supply device and a discharge device, and the bottles enter the disc-shaped conveying module through the supply device, and after label printing is completed on the disc-shaped conveying module, they return to the conveyor through the discharge device; a laser marking module, the laser marking module including a plurality of laser heads, the plurality of laser heads being distributed along the circumference of the disc-shaped conveying module and mounted on the disc-shaped conveying module, capable of marking the packaging bottles at corresponding positions while moving along the disc-shaped conveying module; The drive unit includes a first driving module, the output end of which is connected to the disk-shaped transport module, and is capable of moving and rotating the disk-shaped transport module.

[0006] Specifically, the disk-shaped conveying module includes a first rotating shaft, a first cam disc, a pair of first fixed frames, a first driving rotating disc, a first driven disc, a plurality of first lower pressing mechanisms, and a plurality of storage trays; The first rotating shaft is connected to the output end of the first driving module; The first cam disc is fitted to the first rotary shaft but does not rotate along the first rotary shaft, and a first cam rail is provided on an outer ring of the first cam disc; a pair of first fixing frames respectively provided on both sides of the first cam disc and connected to the first cam disc to fix the first cam disc; The first driven disk and the first driving rotary disk are sequentially fitted on the first rotary shaft and can rotate along the first rotary shaft, and the first driving rotary disk is provided with a plurality of storage trays for placing the bottle bodies; The first driven disc is provided with a first downward pressing mechanism, one for each of the multiple storage trays. A first pulley is provided on one side of the first downward pressing mechanism, and is slidably connected to the first cam disc via a first cam rail. The first pulley can move up and down along the first cam disc in a circular motion to compress or loosen the bottle body.

[0007] Furthermore, a rotation motor is provided under each storage tray, and the rotation motor can move and rotate the corresponding storage tray.

[0008] Furthermore, the first downward pressing mechanism includes a first downward pressing assembly and a pair of first guides. Doba Including, Pair of 1st Guys Doba is provided on the first driven disc, the first lower pressing assembly is fitted to the pair of first guide bars and is slidable along the pair of first guide bars; The first pulley is provided on one side of the first lower pressing assembly and is slidably connected to the first cam disc via a first cam rail, and is capable of moving up and down while moving circumferentially along the first cam disc.

[0009] Furthermore, the first downward pressing mechanism includes a pair of first springs and a pair of circlips, The pair of first springs are fitted onto the pair of first guide bars, respectively; The pair of circlips correspond to the pair of first springs one by one, and are provided at the lower ends of the corresponding pair of first springs, and are connected to the first guides. Doba is permanently connected to the The first spring is disposed between the first lower pressure assembly and the circlip.

[0010] Further, the first lower pressing assembly includes a first slide frame, a first lower pressing rod, and a first lower pressing cover; The first slide frame is fitted onto the pair of first guide bars, and the first pulley is provided on one side of the first slide frame. One end of the first lower pressing rod is connected to the first slide frame, and the other end is movably connected to the first lower pressing cover, which is rotatable about its own axis.

[0011] Furthermore, the first downward pressing mechanism further includes a first fixed plate provided at the upper ends of the pair of first guide bars and fixedly connected to the pair of first guide bars.

[0012] In addition, the laser marking module further includes a second cam disk, a plurality of lifting mechanisms, a second driven disk, and a plurality of laser head controllers; The second cam disc is fixedly connected to the first cam disc via a plurality of connecting posts, and a second cam rail is provided on an outer ring of the second cam disc; The second driven disk is fixedly connected to the first driven disk via a plurality of connecting columns and is movable synchronously with the first driven disk; the plurality of lifting mechanisms are connected to the plurality of laser heads, one for each; a second pulley is provided on one side of each of the lifting mechanisms; the second pulley is slidably connected to the second cam disc via a second cam rail; and the second pulley is capable of vertical movement while making a circular movement along the second cam disc; The plurality of laser head controllers correspond to the plurality of laser heads one by one, and are provided on the second driven disk.

[0013] Furthermore, the lifting mechanism includes a second slide frame and a pair of second guides. Doba Including, the second slide frame is fitted onto the pair of second guide bars and is slidable relative to the pair of second guide bars, the second pulley is provided on one side of the second slide frame and is capable of operating the second slide frame; A pair of second guide bars are fixedly connected to the first driven disc.

[0014] The lifting mechanism further includes a second fixed plate and a pair of second springs; the second fixed plate is provided on the upper end of the pair of second guide bars and fixedly connected to the pair of second guide bars; The pair of second springs are provided at both ends of the second fixed plate, one end of each second spring being connected to the second fixed plate and the other end being connected to the second slide frame.

[0015] Furthermore, a position adjusting 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 adjusting mechanism.

[0016] Furthermore, the first drive module includes a first drive motor and a transmission gear set, and the first drive motor can drive the first rotation shaft, the supply device, and the discharge device through the transmission gear set to operate synchronously.

[0017] The device further includes a first detection camera and a second detection camera, the first detection camera being provided on one side of the connection between the supply device and the disk-shaped conveying module to detect whether the bottle body enters the disk-shaped conveying module, and the second detection camera being provided on one side of the connection between the discharge device and the disk-shaped conveying module to detect whether the bottle body has an associated mark. [Effects of the Invention]

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: First, the laser head moves synchronously with the disc-shaped transport module, making the marked mark clearer and the marking speed faster. Second, the lower pressure assembly and the first cam disc cooperate to adopt a mechanical transmission, which is less prone to breakdown and less costly. Third, the adoption of the lifting mechanism allows the laser head to follow the target more accurately and is inexpensive.

[0019] 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 for which protection is sought. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic diagram of a perspective view according to an embodiment of the present invention; [Figure 2] FIG. 2 is a front view of FIG. [Figure 3]1 is a schematic diagram of a first partial perspective view according to an embodiment of the present invention; [Figure 4] FIG. 4 is an enlarged view of the direction A in FIG. [Figure 5] 1 is a schematic diagram of a lifting mechanism according to an embodiment of the present invention; [Figure 6] FIG. 2 is a plan view of FIG. [Figure 7] FIG. 2 is a schematic diagram of a second partial perspective view according to an embodiment of the present invention. [Figure 8] FIG. 8 is an enlarged view of the direction B in FIG. [Figure 9] FIG. 3 is a schematic diagram of a first downward pressing mechanism according to an embodiment of the present invention. [Figure 10] FIG. 8 is a left side view of FIG. 7. [Figure 11] FIG. 11 is an enlarged view in the direction C in FIG. [Figure 12] 3A and 3B are schematic diagrams illustrating the shape of a first cam rail or a second cam rail according to an embodiment of the present invention. [Figure 13] 4 is a schematic diagram of a fixed connection between a first cam disc and a pair of first fixed frames according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0022] First, a label-less marking device according to an embodiment of the present invention will be described with reference to Figures 1 to 13. It is used for marking bottle bodies and has a wide range of application scenes.

[0023] As shown in FIGS. 1 to 13, an embodiment of the present invention provides a label-less marking equipment, which is connected to an external conveying device including a conveyor 11, a feeding device 12 and a discharging device 13, and further includes: Frame 2, The conveyor has a disc-shaped conveying module 3, which is connected to a supply device 12 and a discharge device 13, and the bottles enter the disc-shaped conveying module 3 through the supply device 12, and after the label printing is completed on the disc-shaped conveying module 3, they return to the conveyor 11 through the discharge device 13. The laser marking module 4 includes a plurality of laser heads 41, which are distributed around the circumference of the disc-shaped conveying module 3 and are mounted on the disc-shaped conveying module 3. The laser heads 41 move along the disc-shaped conveying module 3 and can mark the bottles at the corresponding positions, achieving good marking effect and fast marking speed. The first driving module 5 has an output end connected to the disk-shaped transport module 3, and is capable of moving and rotating the disk-shaped transport module 3.

[0024] Specifically, as shown in FIGS. 2 to 3, 6 to 8, and 10 to 13, in this embodiment, the disk-shaped conveying module 3 includes a first rotating shaft 31, a first cam disc 32, a pair of first fixed frames 33, a first driving rotating disc 34, a first driven disc 35, a plurality of first lower pressing mechanisms 36, and a plurality of storage trays 37. The first rotating shaft 31 is connected to the output end of the first driving module 5, The first cam disc 32 is fitted onto the first rotary shaft 31 but does not rotate along with the first rotary shaft 31, and a first cam rail 321 is provided on the outer ring of the first cam disc 32. The pair of first fixing frames 33 are respectively provided on both sides of the first cam disc 32 and connected to the first cam disc 32 to fix the first cam disc 32; The first driven disk 35 and the first driving rotary disk 34 are fitted onto the first rotary shaft 31 in this order and are rotatable along the first rotary shaft. The first driving rotary disk 34 is provided with a plurality of storage trays 37 for placing bottle bodies thereon. The first driven disc 35 is provided with a first downward pressing mechanism 36, one for each of the storage trays 37. A first pulley 361 is provided on one side of the first downward pressing mechanism 36, and is slidably connected to the first cam disc 32 via a first cam rail 321. The first downward pressing mechanism 36 can move up and down while making a circular motion along the first cam disc 32 to compress or release the bottle body. The cooperation of the first downward pressing mechanism 36 and the first cam rail 321 provides a high transmission effect and is less likely to malfunction.

[0025] Furthermore, as shown in Figures 3 and 11, in this embodiment, a rotation motor 38 is provided under each storage tray 37, and the rotation motor 38 can move and rotate the corresponding storage tray 37, so that the bottle body can be rotated according to the marking needs during marking by the laser head 41.

[0026] Furthermore, as shown in FIGS. 8 and 9, in this embodiment, the first downward pressing mechanism 36 includes a first downward pressing assembly 362 and a pair of first guides. Doba Including -363, Pair of 1st Guys Doba -363 is provided on the first driven disk 35, The first lower pressing assembly 362 is fitted to a pair of first guide bars 363 and is slidable along the pair of first guide bars 363. The first pulley 361 is provided on one side of the first lower pressing assembly 363 and is slidably connected to the first cam disc 32 via the first cam rail 321, and can move up and down while moving circumferentially along the first cam disc 32.

[0027] Furthermore, as shown in FIGS. 8 and 9, in this embodiment, the first downward pressing mechanism 36 includes a pair of first springs 364 and a pair of circlips 365. The pair of first springs 364 are fitted to the pair of first guide bars 363, respectively. The pair of circlips 365 correspond to the pair of first springs 364 one by one, and are provided at the lower ends of the corresponding pair of first springs 364, and are connected to the first guides. DobaFixed connection to -363, The first spring 364 is provided between the first lower pressing assembly 362 and the circlip 365, and the first spring 364 is used to cushion the first lower pressing assembly 362 and assist the first lower pressing assembly 362 in returning.

[0028] Furthermore, as shown in FIGS. 8 and 9, in this embodiment, the first downward pressing assembly 362 includes a first slide frame 3621, a first downward pressing rod 3622, and a first downward pressing cover 3623; The first slide frame 3621 is fitted onto a pair of first guide bars 363, and the first pulley 361 is provided on one side of the first slide frame 3621. One end of the first lower pressure rod 3622 is connected to the first slide frame 3621, and the other end is movably connected to the first lower pressure cover 3623, which can rotate around its own axis, so that the bottle body can better follow when the rotating motor 38 moves and rotates the storage tray 37.

[0029] 8 and 9, in this embodiment, the first downward pressing mechanism 36 further includes a first fixed plate 366 that is provided at the upper end of the pair of first guide bars 363 and fixedly connected to the pair of first guide bars 363. Doba This stabilizes the structure of the first slide frame 363 while restricting the position of the first slide frame 3621.

[0030] Furthermore, as shown in FIGS. 1 to 5, in this embodiment, the laser marking module 4 further includes a second cam disc 42, a plurality of lifting mechanisms 43, a second driven disc 44, and a plurality of laser head controllers 45; The second cam disc 42 is fixedly connected to the first cam disc 32 via a plurality of connecting posts, and a second cam rail 421 is provided on the outer ring of the second cam disc 42; The second driven disk 44 is fixedly connected to the first driven disk 35 via a plurality of connecting columns and can move synchronously with the first driven disk 35; The plurality of lifting mechanisms 43 are connected to the plurality of laser heads 41, one for each, and each lifting mechanism 43 is provided with a second pulley 431 on one side thereof. The second pulley 431 is slidably connected to the second cam disc 42 via a second cam rail 421, and can move up and down while moving circumferentially along the second cam disc 42. The plurality of laser head controllers 45 correspond to the plurality of laser heads 41 one by one, and are provided on the second driven disk 44 .

[0031] 1 to 5, in this embodiment, the lifting mechanism 43 includes a second slide frame 432 and a pair of second guides. Doba -433 included, The second slide frame 432 is fitted onto a pair of second guide bars 433 and is slidable relative to the pair of second guide bars 433, and the second pulley 431 is provided on one side of the second slide frame 432 and can operate the second slide frame 432. The pair of second guide bars 433 are fixedly connected to the first driven disc 35 .

[0032] Furthermore, the lifting mechanism 43 includes a second fixed plate 434 and a pair of second springs 435, The second fixed plate 434 is provided on the upper end of the pair of second guide bars 433 and is fixedly connected to the pair of second guide bars 433. Doba This stabilizes the structure of the second slide frame 433 while restricting the position of the second slide frame 432.

[0033] A pair of second springs 435 are respectively provided on both ends of the second fixed plate 434, with one end of the second springs 435 connected to the second fixed plate 434 and the other end connected to the second slide frame 432. The provision of the second springs 435 serves to cushion the second slide frame 432 and assist in the return of the second slide frame 432, while providing an upward pulling force to the second carriage 432, so that the pressure between the second pulley 431 and the upper wall of the second cam rail 421 becomes nearly zero, significantly reducing the frictional force between the second pulley 431 and the upper wall of the second cam rail 421 during movement.

[0034] Furthermore, as shown in FIG. 5, in this embodiment, a position adjustment mechanism 46 is provided between the lifting mechanism 43 and the corresponding laser head 41, and the position adjustment mechanism 46 can adjust the position between the lifting mechanism 43 and the corresponding laser head 41, thereby positioning the laser head 41 at the optimal marking position.

[0035] Furthermore, as shown in FIG. 10, in this embodiment, the first driving module 5 includes a first driving motor and a transmission gear set, and the first driving motor can drive the first rotating shaft 31, the supply device 12, and the discharge device 13 through the transmission gear set to operate synchronously.

[0036] Furthermore, as shown in Figures 3 and 6, this embodiment further includes a first detection camera 61 and a second detection camera 62, where the first detection camera 62 is provided on one side of the connection between the supply device 12 and the disc-shaped conveying module 3 to detect whether the bottle body enters the disc-shaped conveying module 3, and the second detection camera 62 is provided on one side of the connection between the discharge device 13 and the disc-shaped conveying module 3 to detect whether the bottle body has an associated mark.

[0037] Furthermore, as shown in FIG. 12, in this embodiment, the first cam rail 321 and the second cam rail 421 have similar shapes and configurations.

[0038] The operating principle is as follows: first, a bolt body is transferred from the supply device 12 onto the storage tray 37 of the disc-shaped conveying module 3. The first lower pressing assembly 362 moves from a high position to a low position on the first cam rail 321 following the first pulley 361, causing the first lower pressing cover 3623 to press the bolt body. Then, the laser head 41 at a position corresponding to the bottle body moves from a high position to a low position on the second cam rail 421 following the second pulley 431, marking the bottle body. After the bolt body is marked, the first pressing assembly 362 moves from a low position to a high position on the first cam rail 321 following the first pulley 361, and the laser head 41 at a position corresponding to the bolt body moves from a low position to a high position on the second cam rail 421 following the second pulley 431. The bolt body is then ejected by the discharge device 13 and returned to the conveyor 11, and the same process continues for all the bottles.

[0039] 1 to 13, a label-less marking equipment according to an embodiment of the present invention has been described. The laser head moves synchronously with the disc-shaped conveying module, resulting in clearer marked symbols and faster marking speed. The lower pressure assembly cooperates with the first cam disc, adopting a mechanical transmission that is less prone to malfunction and low cost. The lifting mechanism allows the laser head to follow more smoothly and is also low cost.

[0040] It should be noted that, as used herein, the terms "comprises," "comprises," or any variation thereof, are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that includes a set of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or device. In the absence of further limitations, an element defined by the sentence "comprises" does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0041] Although the contents of the present invention have been described in detail by the above preferred embodiments, it should be recognized that the above description should not be regarded as a limitation on the present invention. After those skilled in the art have read the above contents, various modifications and alternatives to the present invention will become apparent. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A label-less marking equipment connected to an external transport device including a conveyor, a feeding device and a discharging device, A frame is provided. a disk-shaped conveying module connected to the supply device and the discharge device, the packaging bottles entering the disk-shaped conveying module via the supply device, and returning to the conveyor via the discharge device after label printing is completed on the disk-shaped conveying module; a laser marking module, the laser marking module including a plurality of laser heads, the plurality of laser heads being distributed along the circumference of the disc-shaped conveying module and mounted on the disc-shaped conveying module, capable of marking the packaging bottles at corresponding positions while moving along the disc-shaped conveying module; a first driving module, the output end of which is connected to the disk-shaped transport module, and which can move and rotate the disk-shaped transport module; The disk-shaped conveying module includes a first rotating shaft, a first cam disk, a pair of first fixed frames, a first driving rotating disk, a first driven disk, a plurality of first lower pressing mechanisms, and a plurality of storage trays; the first rotating shaft is connected to the output end of the first driving module; the first cam disc is fitted onto the first rotary shaft but does not rotate along the first rotary shaft, and a first cam rail is provided on an outer ring of the first cam disc; the pair of first fixing frames are respectively provided on both sides of the first cam disc and connected to the first cam disc to fix the first cam disc; The first driven disk and the first driving rotary disk are sequentially fitted on the first rotary shaft and are rotatable along the first rotary shaft, and the first driving rotary disk is provided with a plurality of storage trays for placing bottle bodies thereon; The first driven disc is provided with a first downward pressing mechanism corresponding to each of the plurality of storage trays, and a first pulley is provided on one side of the first downward pressing mechanism, and is slidably connected to the first cam disc via the first cam rail, and can move up and down while making a circular movement along the first cam disc to compress or release the bottle body; The laser marking module further includes a second cam disk, a plurality of lifting mechanisms, a second driven disk, and a plurality of laser head controllers; The second cam disc is fixedly connected to the first cam disc via a plurality of connecting posts, and a second cam rail is provided on an outer ring of the second cam disc; The second driven disk is fixedly connected to the first driven disk via a plurality of connecting columns and is movable synchronously with the first driven disk; the plurality of lifting mechanisms are connected to the plurality of laser heads one by one, and each lifting mechanism is provided with a second pulley on one side thereof, and the second pulley is slidably connected to the second cam disc via the second cam rail, and is capable of vertical movement while making a circular movement along the second cam disc; the plurality of laser head controllers correspond to the plurality of laser heads one by one, and are provided on the second driven disk; the lifting mechanism includes a second slide frame and a pair of second guide bars; the second slide frame is fitted onto the pair of second guide bars and is slidable relative to the pair of second guide bars, the second pulley is provided on one side of the second slide frame and is capable of operating the second slide frame, the pair of second guide bars are fixedly connected to the first driven disc; the lifting mechanism includes a second fixed plate and a pair of second springs; the second fixed plate is provided on the upper end of the pair of second guide bars and fixedly connected to the pair of second guide bars; The pair of second springs are respectively provided at both ends of the second fixed plate, one end of the second springs being connected to the second fixed plate and the other end being connected to the second slide frame.

2. the first lower pressing mechanism includes a first lower pressing assembly and a pair of first guide bars; the pair of first guide bars are provided on the first driven disk, the first lower pressing assembly is fitted to the pair of first guide bars and is slidable along the pair of first guide bars; The label-less marking equipment according to claim 1, characterized in that the first pulley is provided on one side of the first lower pressing assembly, and is slidably connected to the first cam disc via the first cam rail, and is capable of moving up and down while moving circumferentially along the first cam disc.

3. the first downward pressing mechanism further includes a pair of first springs and a pair of circlips; the pair of first springs are fitted onto the pair of first guide bars, respectively; The pair of circlips correspond to the pair of first springs one by one, are provided at the lower ends of the corresponding pair of first springs, and are fixedly connected to the first guide bar; 3. The label-less marking device according to claim 2, wherein the first spring is disposed between the first lower pressing assembly and the circlip.

4. the first lower pressing assembly includes a first slide frame, a first lower pressing rod, and a first lower pressing cover; the first slide frame is fitted onto the pair of first guide bars, and the first pulley is provided on one side of the first slide frame; The label-less marking equipment according to claim 2 or claim 3, characterized in that one end of the first lower pressure rod is connected to the first slide frame and the other end is movably connected to the first lower pressure cover, and the first lower pressure cover is rotatable around its own axis.

5. The label-less marking equipment according to claim 2 or claim 3, characterized in that the first lower pressing mechanism is provided at the upper ends of the pair of first guide bars and further includes a first fixed plate fixedly connected to the pair of first guide bars.

6. The label-less marking equipment 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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