A container inner and outer surface inkjet printing device

Abstract

This utility model relates to the field of inkjet printing equipment, and more specifically, to an inkjet printing device for the inner and outer surfaces of containers, comprising: a conveying mechanism for carrying containers; multiple inkjet printing mechanisms, each corresponding to a different color or glaze inkjet printing channel, each inkjet printing mechanism performing inkjet printing of one color or glaze; a frame body for mounting the above mechanisms, with the conveying mechanism located below the inkjet printing mechanisms; multiple workstations are provided on the frame body, each workstation having multiple inkjet printing mechanisms corresponding to multiple inkjet printing channels, and the conveying mechanism carrying containers moving between different workstations. By setting multiple workstations on the frame body, with each workstation having multiple inkjet printing mechanisms corresponding to multiple inkjet printing channels, the number of workstations is reduced, the length of the inkjet printing equipment is shortened, and the floor space occupied by the inkjet printing equipment is reduced, which not only reduces space costs but also improves production efficiency and saves energy.

Description

Technical Field

[0001] This utility model relates to the field of inkjet printing equipment, and more specifically, to an inkjet printing device for the inner and outer surfaces of a container. Background Technology

[0002] Inkjet printing is a modern ceramic decoration technology that uses high-precision printheads to directly spray ceramic-specific inks or glazes onto the ceramic body, followed by high-temperature firing to permanently solidify the design. This technology combines digital design with traditional ceramic craftsmanship and is widely used for creating designs on tableware such as plates, bowls, and cups. Compared to traditional screen printing and decal printing, inkjet printing offers significant advantages in efficiency, quality, cost, and environmental friendliness. For example, it boasts ultra-high precision and image quality, with a resolution of up to 1440 dpi, achieving photo-realistic detail, and supports multi-color channels for true color reproduction. It offers production flexibility and customization, with digital files directly transferred to the inkjet printer, eliminating the need for screen printing or decal production. This seamless transition from design to printing, coupled with low minimum order quantities, makes it suitable for personalized orders, eliminating the inventory risks associated with large-volume printing and allowing for on-demand production. Furthermore, it is highly efficient, energy-saving, and environmentally friendly, with precise on-demand inkjet printing achieving an ink utilization rate of over 95%, reducing ink waste and eliminating the need for screen cleaning or decal backing paper waste.

[0003] Inkjet printing and traditional printing both rely on subtractive color mixing to synthesize colors. However, after high-temperature firing, some of the four basic CMYK colors of ceramic pigments undergo significant changes. For example, magenta tends to darken or turn brownish, yellow may be underdeveloped, and cyan tends to turn bluish at high temperatures. Furthermore, the color gamut of ceramic inks is about 30-40% narrower than that of ordinary printing inks. CMYK alone is insufficient to cover common color requirements, necessitating the use of other colors to supplement or compensate for losses during high-temperature firing. Additionally, some containers require a glaze coating before and after color printing to cover the pigment layer. Therefore, when printing complex patterns, 8-16 printing units with 8-16 workstations are often needed to complete the printing process. However, the sheer size and length of the equipment required for these 8-16 workstations not only drastically increases space costs but also hinders production efficiency and exacerbates energy consumption. Utility Model Content

[0004] The present invention aims to overcome at least one of the defects (deficiencies) of the prior art and provide a container inner and outer surface inkjet printing device to solve the problem that traditional inkjet printing devices are too long and large, which not only causes a surge in space costs, but also restricts the efficiency of the production process and aggravates energy consumption.

[0005] The technical solution adopted by this utility model is a container inner and outer surface spraying device, comprising: a conveying mechanism for carrying the container; a spraying mechanism, including multiple spraying channels corresponding to multiple different colors or glazes, each spraying mechanism realizing the spraying of one color or glaze; a frame body for mounting the above mechanisms, so that the conveying mechanism is located below the spraying mechanism; multiple workstations are set on the frame body, each workstation is set with multiple spraying mechanisms corresponding to multiple spraying channels, and the conveying mechanism carries the container to flow between different workstations.

[0006] The main frame houses the conveying and printing mechanisms, and has multiple workstations. The conveying mechanism, located below the printing mechanisms, carries the container, allowing it to move between different workstations. Multiple printing mechanisms correspond to different color or glaze printing channels, each capable of printing one color or glaze. When the container moves to a workstation, one printing mechanism at that workstation moves to a suitable distance on the container's inner or outer surface for printing, rotates the container, and begins printing. After one printing mechanism finishes printing, if the remaining printing mechanisms at that workstation need to print, the above steps are repeated. If printing by the remaining mechanisms at that workstation is not required, the container moves to the next workstation until all workstations are completed. If the container does not require printing by all printing mechanisms at a particular workstation, the container can skip that workstation and move to the next. By setting up multiple printing units at each workstation, allowing multiple printing units to share one workstation, the number of workstations is reduced, the length of the printing equipment is shortened, and thus the floor space occupied by the printing equipment is reduced. This not only reduces space costs but also improves production efficiency and saves energy.

[0007] Furthermore, the printing mechanism includes a printhead and an actuation mechanism, the actuation mechanism driving the printhead to achieve three degrees of freedom of movement: translation, lifting, and rotation.

[0008] The printing mechanism's motion mechanism drives the printhead to move horizontally, adjusting the horizontal distance between the printhead and the container; it also drives the printhead to rise and fall, adjusting its height to match the container's height; and it rotates the printhead to adjust its angle, ensuring the printhead's tilt angle matches the container's surface tilt angle. This ensures that the distance between the nozzles at the top and bottom of the printhead and the container surface is consistent, allowing the ink droplets ejected from the nozzles to be sprayed vertically onto the container surface. This improves the accuracy and quality of the printed pattern and prevents blurry or diffused edges caused by varying distances between the nozzles and different areas of the container's inner or outer surface, as well as the formation of burrs and jagged edges due to oblique ink droplet impacts.

[0009] Furthermore, the rotational degree of freedom of the nozzle is a range of 150° rotation to the front or rear, with the vertical downward angle as 0°.

[0010] When printing on the inner or outer surface of a container, the printhead may need to rotate in different directions. Setting the printhead to rotate both forward and backward allows for selection as needed, and a 150° rotation range can accommodate various container surfaces. By enabling the printhead to rotate 150° forward or backward, it becomes suitable for printing on the inner or outer surfaces of various containers. Preferably, the printhead can be configured to rotate only to one side, i.e., the printhead located at the front of the workstation rotates backward, and the printhead located at the rear of the workstation rotates forward. More preferably, the printhead can rotate a range of 140° forward or backward.

[0011] Furthermore, the actuation mechanism also includes driving the printhead to move upward or downward a distance δ along the printing surface.

[0012] The printhead has multiple rows of staggered nozzles. Depending on the required printing accuracy, one row of nozzles can be selected for printing on the inner or outer surface of the container at a time, or multiple rows of nozzles can be selected for interpolation printing on either surface. If interpolation printing with multiple rows of nozzles still cannot meet the required accuracy, multiple rounds of printing can be performed on the inner or outer surface of the container. During each round, an actuating mechanism moves the printhead a distance δ upwards or downwards along the printing surface, achieving interpolation printing and improving printing accuracy without replacing the printhead.

[0013] Furthermore, the multiple workstations are arranged in a straight line, and each workstation is equipped with two printheads corresponding to two printing channels. The two printheads are located on the front and rear sides of the workstation arrangement direction, respectively. All the printheads on the front side share a front-side action mechanism, and all the printheads on the rear side share a rear-side action mechanism.

[0014] During operation, the printing module moves containers sequentially to each station, where the printing mechanism performs the printing. The stations are arranged in a straight line because straight sections are free from centrifugal force interference, ensuring stable container movement and facilitating precise positioning. Furthermore, straight sections are suitable for installing stoppers or blocking mechanisms to temporarily store, queue, or synchronize containers. Curved sections, due to trajectory changes, make precise control of the stopping position difficult. Therefore, arranging the stations in a straight line ensures precise positioning and improves printing quality. During printing, containers in the same batch have identical shapes, and the horizontal distance, vertical height, and rotation angle of all front and rear printheads are also the same. All front printheads share a single front actuation mechanism, and all rear printheads share a single rear actuation mechanism. This simplifies the equipment structure, saves costs, and facilitates maintenance. It also avoids errors caused by different printheads using different actuation mechanisms, preventing error accumulation.

[0015] Furthermore, the front and rear action mechanisms each include a front-to-back translation mechanism, a vertical lifting mechanism, and a rotation mechanism. The rotation mechanism is mounted on the vertical lifting mechanism, and the vertical lifting mechanism is mounted on the front-to-back translation mechanism.

[0016] The front-side actuation mechanism's forward and backward translation mechanism adjusts the horizontal distance of all front nozzles to ensure a suitable horizontal distance between them and the container. The up and down lifting mechanism adjusts the height of the nozzles to match the container's height. The rotation mechanism adjusts the angle of all nozzles to align with the container's inner or outer surface. Similarly, the rear-side actuation mechanism adjusts the horizontal distance, vertical height, and tilt angle of all rear nozzles. The rotation mechanism is mounted on the up and down lifting mechanism, which in turn is mounted on the forward and backward translation mechanism. The up and down lifting mechanism drives the rotation mechanism and the nozzles fixed on the rotating shaft to achieve vertical movement, while the forward and backward translation mechanism drives the up and down lifting mechanism, the rotation mechanism, and the nozzles on the rotating shaft to achieve horizontal movement.

[0017] Furthermore, the rotating mechanism includes a rotating shaft parallel to the workstation arrangement direction and a rotating shaft driving device. All nozzles on the same side are fixed on the rotating shaft at the same angle. The rotating shaft driving device drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the change of the printing angle of all nozzles on the same side.

[0018] A rotating shaft is driven by a rotating shaft drive device, which in turn drives all the printheads fixed on the shaft to rotate, thus changing the printing angle of all printheads on the same side. The rotating shaft must be parallel to the workstation arrangement direction to ensure that the distance and angle between all printheads on the same side and the inner or outer surface of the container are consistent. All printheads on the same side must be fixed to the rotating shaft at the same angle to ensure that all printheads on the same side have the same initial angle, so that the angle after rotation is also the same.

[0019] Furthermore, the conveying mechanism includes a conveying track and multiple bases, the conveying track drives the multiple bases to move between the workstations, and each base includes a rotating device and a negative pressure adsorption device.

[0020] The base is used to support the container, the conveyor track is used to drive the base to rotate, the rotating device on the base is used to drive the container on the base to rotate so that the inkjet printing mechanism can print on the inner or outer surface of the container, and the negative pressure adsorption device is used to adsorb the container on the base to prevent the container from falling or moving during rotation.

[0021] Furthermore, the conveying track is a linear reciprocating conveyor belt, with 2-3 bases as a group, and the container reciprocates on the conveyor belt.

[0022] Linear reciprocating conveyor belts occupy less space, positioned below the printing mechanism without increasing the equipment width. Containers are placed on bases, which flow from the beginning of the conveyor track through the workstations. After being printed by the printing mechanism, they flow to the end, where the printed container is removed, and the base returns to the beginning of the conveyor track. Secondly, using a single base as a group results in lower production efficiency. Grouping bases in sets of 2-3 facilitates adjusting the spacing within a group. Each base stops precisely at the printing station. When one base is printing at a station, the other 1-2 bases will remain at other stations, printing simultaneously, thus improving printing efficiency. However, since a single base failure requires downtime for the entire group for maintenance, too many bases in a group reduce maintenance efficiency. Furthermore, too many bases in a single group increase weight, leading to increased conveyor belt load and potentially slippage or motor overload. Therefore, the number of bases in a single group should not exceed 3.

[0023] Furthermore, the conveying track is a circular conveyor belt, with each base carrying a container that flows on the conveyor belt.

[0024] Using a circular conveyor belt, the base and containers can circulate along a closed track, eliminating the need for frequent starts and stops and the need to wait for all containers on all bases to finish before starting the next round of printing, thus improving production efficiency. The turning radius of the circular conveyor belt must meet the dimensions of the base, typically ≥1.5 times the base length. Therefore, by having each base carry containers one at a time, the turning radius of the circular conveyor belt can be minimized, thereby reducing the footprint of the conveyor mechanism.

[0025] Compared with existing technologies, the beneficial effects of this utility model are as follows: By setting multiple workstations on the main frame, with multiple printing mechanisms corresponding to multiple printing channels at each workstation, the number of workstations is reduced, the length of the printing equipment is shortened, and the floor space occupied by the printing equipment is reduced. This not only reduces space costs but also improves production efficiency and saves energy. The printing mechanism includes a printhead and an actuation mechanism. The actuation mechanism includes a forward and backward translation mechanism, a vertical lifting mechanism, and a rotation mechanism. The forward and backward translation mechanism drives the printhead to achieve translational movement, used to adjust the horizontal distance between the printhead and the container; the vertical lifting mechanism drives the printhead to achieve vertical movement, used to adjust the height of the printhead; and the rotation mechanism drives the printhead to achieve rotational movement, used to adjust the tilt angle of the printhead. Through the actuation mechanism, the printhead can print on the inner or outer surface of the container at a suitable distance and angle, thereby improving the accuracy and effect of the printed pattern. The printhead can rotate 150° forward or backward, making it suitable for printing on the inner or outer surfaces of various containers. The actuation mechanism also includes the movement of the printhead upwards or downwards a distance δ along the printing surface. When the printhead's printing cannot meet the accuracy requirements, multiple rounds of printing can be performed on the inner or outer surface of the container. During each round of printing, the actuation mechanism drives the printhead to move upwards or downwards a distance δ along the printing surface, achieving interpolation printing to improve printing accuracy. The multiple stations of this equipment are arranged in a straight line, facilitating precise positioning and control of the base's stop position. Each station has two printheads corresponding to two printing channels, located on the front and rear sides of the station arrangement, respectively, halving the equipment's length. Furthermore, all front-side printheads share a single front-side actuation mechanism, and all rear-side printheads share a single rear-side actuation mechanism, simplifying the equipment structure, saving costs, and avoiding errors caused by different printheads using different actuation mechanisms. All printheads on the same side are fixed at the same angle to the rotating shaft of the rotating mechanism, allowing all printheads on the same side to print on the inner or outer surface of the container at the same tilt angle, improving printing accuracy. The conveyor mechanism can be configured as a linear reciprocating type or a circular circulating type. The linear reciprocating conveyor mechanism occupies less space, while the circular circulating conveyor mechanism does not need to wait for all containers on the base to finish before starting the next round of printing, which can improve production efficiency. The rotating device on the base can drive the containers on it to rotate, so that the printing mechanism can print on the inner or outer surface of the containers. The negative pressure adsorption device can hold the containers on the base, preventing the containers from falling or moving during rotation. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the present invention.

[0027] Figure 2 This is a 3D view of the inkjet printing machine.

[0028] Figure 3 This is a front view of the inkjet printing mechanism.

[0029] Figure 4 This is the right view of the inkjet printing machine.

[0030] Figure 5 This is an enlarged view of A.

[0031] Figure 6 This is an enlarged view of B.

[0032] Figure 7 This is a structural diagram of a reciprocating transmission mechanism.

[0033] Figure 8 This is another structural diagram of a reciprocating transmission mechanism.

[0034] Figure 9 This is a structural diagram of the movable base.

[0035] Figure 10 This is a diagram of the internal structure of the movable base.

[0036] Figure 11 This is a front view of the utility model in use.

[0037] Figure 12 This is a right view of the utility model in use.

[0038] Figure 13 This is a structural diagram of a cyclic conveying mechanism.

[0039] Figure 14 This is a structural diagram of the working section.

[0040] Figure 15 This is a structural diagram of the base.

[0041] Figure 16 This is a diagram of the internal structure of the base. Detailed Implementation

[0042] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Example 1

[0043] like Figure 1 , Figure 2As shown, a container inner and outer surface printing device includes: a conveying mechanism 300 for carrying the container; multiple printing mechanisms 200, each corresponding to a different color or glaze printing channel, with each printing mechanism 200 printing one color or glaze; a frame body 100 for mounting the above mechanisms, with the conveying mechanism 300 positioned below the printing mechanisms 200; multiple workstations are provided on the frame body 100, each workstation having multiple printing mechanisms 200 corresponding to multiple printing channels, and the conveying mechanism 300 carrying the container moving between different workstations. The printing mechanism 200 includes a printhead 210 and an actuation mechanism 220, the actuation mechanism 220 driving the printhead 210 to achieve translation, lifting, and rotational movements.

[0044] Specifically, such as Figure 3 , Figure 4 As shown, the main frame 100 has six workstations arranged in a straight line. Each workstation has two printheads 210, located at the front and rear sides of the workstation arrangement, respectively, for a total of 12 printheads 210, with six at the front and six at the rear. The six printheads at the front share a single front actuation mechanism 220, and the six printheads at the rear share a single rear actuation mechanism 220. Above the six printheads at the front and rear sides, ink cartridge supports 230 are respectively installed. The ink cartridge supports 230 are parallel to the workstation arrangement direction and include a housing plate 2301, a back slide rail 2302, and a bottom slide rail 2303. Multiple ink cartridges 231 are installed inside the ink cartridge holder 230. Slider 2311 is provided on the bottom and the side facing the back slide rail 2302 of each ink cartridge 231. The multiple ink cartridges 231 are mounted on the back slide rail 2302 and the bottom slide rail 2303 via the slider 2311. Each ink cartridge 231 corresponds to a printing channel that supplies ink to the corresponding printhead 210. Each ink cartridge 231 contains a single color of pigment or glaze. Different ink cartridges 231 contain different colors of pigment, and the pigment color contained in the front ink cartridge 231 is different from that contained in the rear ink cartridge 231, thus enabling each printing mechanism 200 to print a single color or glaze.

[0045] like Figures 2-6As shown, the front and rear actuation mechanisms 220 each include a front-to-back translation mechanism 221, a vertical lifting mechanism 222, and a rotation mechanism 223. The rotation mechanism 223 is mounted on the vertical lifting mechanism 222, and the vertical lifting mechanism 222 is mounted on the front-to-back translation mechanism 221. The front-to-back translation mechanism 221 drives the nozzle 210 to achieve translational movement, the vertical lifting mechanism 222 drives the nozzle 210 to achieve vertical lifting movement, and the rotation mechanism 223 drives the nozzle 210 to achieve rotational movement. The rotational freedom of the nozzle 210 is 0° with vertical downward as the angle, and it rotates 150° to the front or rear. Preferably, the nozzle 210 can be configured to rotate only to one side, that is, the nozzle 210 located at the front of the workstation arrangement direction rotates to the rear, and the nozzle 210 located at the rear of the workstation arrangement direction rotates to the front. Preferably, the nozzle 210 rotates 140° to the front or rear. The actuation mechanism 220 can also move the printhead 210 up or down a distance δ along the printing surface to improve printing accuracy. The printhead 210 is provided with multiple rows of staggered nozzles. Depending on the printing accuracy requirements, one row of nozzles can be selected to print on the inner or outer surface of the container each time, or multiple rows of nozzles can be selected to perform interpolation printing on the inner or outer surface of the container. If the printing accuracy still does not meet the requirements, multiple rounds of printing can be performed on the inner or outer surface of the container. During each round of printing, the printhead 210 moves up or down a distance δ along the printing surface to achieve interpolation printing.

[0046] The front and rear actuation mechanisms 220 each include two forward and backward translation mechanisms 221. These two mechanisms are synchronously arranged at the head and tail ends of the cartridge holder 230, respectively. Each mechanism includes a first drive motor 2211, a first lead screw 2212, and a first nut 2213 mounted on the lead screw 2212. The lead screw 2212 is perpendicular to the workstation arrangement direction and connected to the output shaft of the first drive motor 2211. A first fixed seat 2214 is mounted on the first nut 2213, and the vertical lifting mechanism 222 is mounted on the first fixed seat 2214. When the first drive motor 2211 operates, the first lead screw 2212 can drive the first nut 2213 and the first fixed seat 2214 to move, thereby causing the vertical lifting mechanism 222 to translate.

[0047] Two lifting mechanisms 222 are also provided, and the two lifting mechanisms 222 are also set synchronously at the head and tail ends of the ink cartridge bracket 230, respectively. Each mechanism includes a vertically arranged bracket 2221, a second drive motor 2222 at the top of the bracket 2221, a second lead screw 2223, and a second nut 2224 on the second lead screw 2223. The bracket 2221 is connected to the first fixed seat 2214. The second lead screw 2223 is vertically arranged and connected to the second drive motor 2222 via a reducer 2225. The reducer 2225 can amplify the output torque of the second drive motor 2222 by reducing its rotational speed, thereby improving control accuracy and achieving more precise position control. A second fixed seat 2226 is also provided on the second nut 2224, and the rotating mechanism 223 is mounted on the second fixed seat 2226. When the second drive motor 2222 is working, the second lead screw 2223 drives the second nut 2224 and the second fixed seat 2226 to rise and fall, thereby causing the rotating mechanism 223 to rise and fall.

[0048] The rotating mechanism 223 includes a rotating shaft 2231 parallel to the workstation arrangement direction and a rotating shaft drive device 2232. Both ends of the rotating shaft 2231 are rotatably connected to the second fixed seats 2226 of the lifting mechanisms 222 at both ends. The rotating shaft drive device 2232 is connected to the rotating shaft 2231 and drives the rotating shaft 2231 to rotate. The six nozzles 210 on the same side are fixed to the rotating shaft 2231 at the same angle. When the rotating shaft drive device 2232 operates, it drives the rotating shaft 2231 to rotate, thereby causing the six nozzles 210 on the same side to rotate. The six nozzles 210 on the same side have the same initial angle, the same rotation angle, and the same final angle after rotation.

[0049] like Figures 7-9As shown, the conveying mechanism 300 is a reciprocating conveying mechanism, including a conveying track 310 and multiple bases 320. The conveying track 310 is a linear reciprocating conveyor belt, and a slide rail 311 and a linear motor primary 312 are provided on one side of the conveying track 310. Each base 320 includes a rotating device 321 and a negative pressure adsorption device 322. The bases 320 are grouped in pairs and integrated on a movable base 330. The movable base 330 facing the conveying track 310 is provided with a slider 331 that cooperates with the slide rail 311 and a linear motor secondary 332. The movable base 330 cooperates with the conveying track 310 to drive the bases 320 to rotate. Two movable bases 330 are provided on the conveying track 310. When one movable base 330 is in the inkjet printing station, the other movable base can simultaneously perform loading or unloading operations. This alternating rotation saves time and improves efficiency. The movable seat 330 is also connected to a drag chain 340, which is used to wrap cables or pipelines, force the cables and pipelines to bend along a preset path, such as horizontal reciprocating motion, to prevent tangling, knotting or interference with equipment components, and the drag chains 340 connected to the two movable seats 330 are arranged parallel to each other so as not to interfere with each other.

[0050] Multiple position sensors 350 are also installed on one side of the conveyor track 310. These position sensors are configured according to the number and location of each workstation to ensure that the base 320 stops at the corresponding position, allowing the printing channel to perform printing. At both ends of the conveyor track 310, a starting limiter 360 and an ending limiter 370 are respectively installed for each moving seat 330 to ensure that the moving seat 330 stops at a preset position, preventing it from colliding with the end of the track due to inertia or control failure, or from a newly printed moving seat 330 colliding with a previously stopped moving seat 330, thus preventing damage to the container. Baffles 380 are also installed at both ends of the conveyor track 310 to prevent the moving seats 330 from uncontrollably running off the track.

[0051] like Figure 10 As shown, the negative pressure adsorption device 322 includes a negative pressure pump 3221, a solenoid valve 3222, a hollow shaft 3223, and a suction cup 3224. The negative pressure pump 3221 is connected to the input end of the solenoid valve 3222. The hollow shaft 3223 is vertically arranged, and its lower end is connected to the output end of the solenoid valve 3222. The suction cup 3224 is arranged at the upper end of the hollow shaft 3223, and the suction cup 3224 is provided with a through hole and communicates with the hollow shaft 3223. In use, the container is placed on the suction cup 3224. Through the action of the negative pressure pump 3221, the external atmospheric pressure can press the container against the suction cup 3224 to achieve fixation.

[0052] The rotating device 321 includes a servo motor 3211, which is vertically arranged with its output axis pointing upward and coaxially connected to the hollow shaft 3223 of the negative pressure adsorption device 322. When the servo motor 3211 is working, it can drive the suction cup 3224 at the upper end of the hollow shaft 3223 to rotate, thereby rotating the container carried on the suction cup 3224 and realizing the spraying on the surface of the container.

[0053] like Figure 11 , Figure 12 As shown, when the printing equipment is in use, the conveyor mechanism 300 carries the container and moves it between different workstations. One printhead 210 at each workstation moves to a suitable distance on the inner or outer surface of the container for printing. When the inner or outer surface of the container is a slope or arc, the printhead 210 rotates to a printing angle matching the inner or outer surface of the container, then the container rotates, and the printhead 210 begins printing. After one printhead 210 finishes printing, if the remaining printheads 210 at that workstation need to print, the above steps are repeated. If the remaining printheads 210 at that workstation do not need to print, the container moves to the next workstation until all workstations are completed. It can be understood that when printing on the outer surface of the container, if both printheads 210 at that workstation need to print, both printheads 210 can print simultaneously. Example 2

[0054] In this embodiment, the frame body 100 and the printing mechanism 200 are the same as in the above embodiment, except that the conveying mechanism 400 in this embodiment is a cyclic conveying mechanism, such as... Figure 13 As shown, it includes a conveyor track 410 and multiple bases 420. The conveyor track 410 is an annular circulating conveyor belt. The conveyor track 410 drives the multiple bases 420 to rotate. Each base 420 includes a rotating device 421 and a negative pressure adsorption device 422.

[0055] Specifically, such as Figure 13 , Figure 14 As shown, the conveyor track 410 is a racetrack-shaped conveyor belt, including a working section 411 and an auxiliary section 412. The working section 411 is located on the straight section at the front of the conveyor track 410, and the auxiliary section 412 is connected to the beginning and end of the working section 411 to form a loop. The frame body 100 and the printing mechanism 200 are located on the working section 411 of the conveyor track 410. The frame body 100 has 6 workstations. On the working section 411, a position sensor 430 is installed at the position corresponding to each workstation to ensure that the base 420 and the container it carries can stop at a preset position, ensuring accurate positioning between the container and the printing channel.

[0056] To ensure that the base 420 can immediately enter the workstation for printing after carrying the container, reducing idle time, a feeding area is set at the beginning of the working section 411, and each base 420 carries a container one by one on the conveyor belt. To prevent material flow disorder and to ensure that the printed containers can be removed in a timely manner, a discharge area is set at the end of the working section 411.

[0057] like Figure 14 , Figure 15 As shown, the working section 411 of the conveying track 410 is equipped with a slide rail 4111 and a linear motor primary 4112. The base 420, facing the conveying track, is equipped with a slider 4201 that cooperates with the slide rail 4111 and a linear motor secondary 4202. The base 420 is driven by a linear motor on the working section 411, directly converting electrical energy into linear motion. This avoids positioning errors caused by gear meshing or lead screw backlash, resulting in high repeatability and extremely high precision and stability, ensuring the base 420 stops at a preset position and guaranteeing positioning accuracy. The working section 411 of the conveying track 410 may also be equipped with multiple cable carriers 4113 for wrapping cables or pipelines to prevent tangling or knotting. These multiple cable carriers 4113 are parallel to each other and do not interfere with each other. The cable carriers 4113 are connected to the base 420 via a plug-in connection to facilitate connection and disassembly. The auxiliary section 412 is mainly used to transport the base 420 to the feeding area. Since high precision is not required, a drive device (not shown) can be installed on the base 420, using a conventional drive method to transport the base 420 to the working section 411, where it switches to linear motor drive. Alternatively, the auxiliary section 412 can also be driven by a linear motor, specifically a ring linear motor.

[0058] like Figure 16 As shown, the negative pressure adsorption device 422 includes a negative pressure pump 4221, a solenoid valve 4222, a hollow shaft 4223, and a suction cup 4224. The negative pressure pump 4221 is connected to the input end of the solenoid valve 4222. The hollow shaft 4223 is vertically arranged, and its lower end is connected to the output end of the solenoid valve 4222. The suction cup 4224 is arranged at the upper end of the hollow shaft 4223, and the suction cup 4224 is provided with a through hole and communicates with the hollow shaft 4223. In use, the container is placed on the suction cup 4224. Through the action of the negative pressure pump 4221, the external atmospheric pressure can press the container against the suction cup 4224 to achieve fixation.

[0059] like Figure 16As shown, the rotating device 421 includes a servo motor 4211, which is vertically arranged with its output axis pointing upward. It is coaxially connected to the hollow shaft 4223 of the negative pressure adsorption device 422. When the servo motor 4211 is working, it can drive the suction cup 4224 at the upper end of the hollow shaft 4223 to rotate, thereby rotating the container carried on the suction cup 4224 and realizing the spraying on the surface of the container.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A container inner and outer surface painting device, comprising: a conveying mechanism for carrying containers; a painting mechanism comprising a plurality of painting channels corresponding to a plurality of different colors or glazes, each painting mechanism realizing painting of one color or glaze; a rack body for mounting the above-mentioned mechanisms, with the conveying mechanism located below the painting mechanism; characterized in that the rack body is provided with a plurality of stations, each station is provided with a plurality of painting mechanisms corresponding to a plurality of painting channels, and the conveying mechanism carries containers to circulate among different stations.

2. The apparatus according to claim 1, wherein The painting mechanism comprises a spray head and a motion mechanism, which drives the spray head to realize movement with three degrees of freedom, i.e. translation, lifting and rotation.

3. The apparatus according to claim 2, wherein The rotation degree of freedom of the spray head is a range of 150° of forward or rearward rotation with a vertical downward direction as 0° angle.

4. The apparatus according to claim 2, wherein The motion mechanism further comprises a mechanism for driving the spray head to realize movement with a distance δ of upward or downward movement along the painting surface.

5. The apparatus for spraying a container according to any one of claims 2 to 4, wherein The plurality of stations are arranged in a straight line, each station is provided with two spray heads corresponding to two painting channels, and the two spray heads are respectively located at the front side and the rear side of the station arrangement direction, all front side spray heads share one front side motion mechanism, and all rear side spray heads share one rear side motion mechanism.

6. The apparatus according to claim 5, wherein The front side and rear side motion mechanisms each comprise a front-rear translation mechanism, an up-down lifting mechanism and a rotation mechanism, the rotation mechanism is mounted on the up-down lifting mechanism, and the up-down lifting mechanism is mounted on the front-rear translation mechanism.

7. The apparatus according to claim 6, wherein The rotation mechanism comprises a rotation shaft parallel to the station arrangement direction and a rotation shaft driving device, all spray heads on the same side are fixed on the rotation shaft at the same angle, the rotation shaft driving device drives the rotation of the rotation shaft, and the rotation of the rotation shaft drives the change of the painting angle of all spray heads on the same side.

8. The apparatus for spraying a container according to any one of claims 1 to 4, wherein The conveying mechanism comprises a conveying track and a plurality of bases, the conveying track drives the plurality of bases to circulate among the stations, each base comprises a rotating device and a negative pressure adsorption device.

9. The apparatus according to claim 8, wherein The conveying track is a linear reciprocating conveying belt, 2-3 bases are taken as a group, and the containers are carried on the conveying belt to reciprocate and circulate.

10. The apparatus according to claim 8, wherein The conveying track is a ring-shaped circulating conveying belt, and each base carries the containers to circulate on the conveying belt one by one.

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