High-definition curved surface printing machine

Abstract

The high-definition curved surface printing machine comprises a base, a conveying unit and a printing unit, the conveying unit and the printing unit are sequentially arranged on the base, and the printing unit comprises a printing wheel and a large printing disc which are rotationally arranged on the base. The large printing disc comprises a rotating disc rotationally arranged on the base; the printing assemblies are movably arranged on the rotating disc, the multiple sets of printing assemblies are arranged at intervals in a surrounding mode, and any set of printing assembly comprises a printing base and a bearing insertion rod movably inserted into the printing base; the adjusting assembly is arranged on the rotating disc and used for driving the multiple printing assemblies to move in the radial direction of the rotating disc at the same time. The printing unit further comprises a diameter adaptation supporting assembly. The diameter adaptation supporting assembly at least comprises a rotating sleeve and a supporting piece. The three sets of supporting pieces are arranged around the axis of the rotating sleeve at intervals, and the printing stock within the set diameter range is adaptively supported by adjusting the opening and closing angles of the three sets of supporting pieces. And the printing precision and accuracy can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of printing equipment, and in particular to a high-definition curved surface printing machine. Background Art

[0002] Curved surface printing machines are equipment that print high-quality patterns, text or logos on the surface of cylindrical substrates such as high-definition tubes and cans. With the increase in product types in the market, the industry's demand for printed product quality and production efficiency continues to increase.

[0003] Printing methods commonly include screen printing, inkjet printing, and flexographic printing, and different printing processes require different printing equipment. For example, a curved printing press using flexographic printing typically includes a printing wheel with a printing plate mounted on it and a printing wheel with the substrate mounted on it. The printing wheel drives the substrate into contact with the printing plate on the printing wheel and rotates, transferring the ink from the printing plate to the substrate.

[0004] However, existing curved printing presses have certain limitations in terms of substrate adaptability. The relative positions of the printing wheel and the substrate wheel in most curved printing presses are fixed, resulting in printing only on substrates within a specific diameter range. Furthermore, when changing substrates of different diameters, the fixings and loading components on the printing wheel used to mount the substrate are difficult to ensure precise fit and require complete replacement, which is not conducive to efficient production. Some curved printing presses that can adjust the substrate diameter do so by changing the spacing between the printing wheel and the substrate wheel or by changing the thickness of the printing plate. This can weaken the rigid connection between the printing wheel, the substrate wheel, and the frame, potentially causing offsets due to mechanical vibrations during printing, which can reduce printing accuracy. Summary of the Invention

[0005] The object of the present invention is to provide a high-definition curved printing machine to solve the problem of poor adaptability of existing curved printing machines to printing substrates.

[0006] To achieve this object, the present invention adopts the following technical solutions: A high-definition curved printing machine includes a base, a conveying unit and a printing unit sequentially arranged on the base, the conveying unit includes an upper tube assembly arranged at the feeding end of the printing unit, the printing unit includes a printing wheel and a printing plate rotatably arranged on the base, and the printing plate includes: A rotating disk rotatably mounted on the base; A printing assembly is movably mounted on the rotating disk. The printing assembly is arranged in a plurality of groups in a surrounding manner. Any group of the printing assemblies includes a printing seat and a receiving rod movably inserted on the printing seat. An adjusting assembly is provided on the rotating disk, and is used to drive multiple groups of the printing assemblies to move simultaneously along the radial direction of the rotating disk; The printing unit further comprises a diameter-adaptive support assembly, the diameter-adaptive support assembly comprising at least a rotary sleeve rotatably sleeved on the receiving rod and three sets of support members rotatably connected to the rotary sleeve; Among them, the three groups of support members are arranged at intervals around the axis of the rotating sleeve. By adjusting the opening and closing degree of the three groups of support members, adaptive support for the printing material within the set diameter range can be achieved, and the axis of the printing material is made to coincide with the axis of the receiving rod.

[0007] Optionally, the diameter adaptation support portion further includes: A support portion, provided on the rotating sleeve, for driving the support member to reciprocate in a direction perpendicular to the axis of the rotating sleeve; A driving part is provided on the rotating sleeve and is used to drive the supporting part to operate when the driving part is started; a passive driving member connected to the upper tube assembly, wherein the passive driving member is capable of activating the driving portion; During the rotation of the rotating disk, the printing assembly closest to the printing wheel is the printing station, and the printing assembly closest to the upper tube assembly is the loading station; Among them, the upper tube assembly sleeves the printing material onto the receiving rod at the loading station. During the movement of the receiving rod from the loading station to the printing station, the driving part is activated by the passive driving part to drive the three groups of support parts to expand a corresponding distance.

[0008] Optionally, three embedding grooves are evenly spaced around the axis on the side wall of the rotating sleeve, and each embedding groove is provided with a group of the supporting members and a group of the supporting parts, and the supporting parts include: A mounting seat, connected to the embedding groove via a connecting rod, one end of the connecting rod is rotatably connected to the mounting seat, two connecting rods are symmetrically provided, and the support member is rotatably connected to the mounting seat; A sliding seat, the other end of the connecting rod is rotatably connected to the sliding seat, a sliding groove extending along the length direction of the rotating sleeve is opened at the bottom of the embedding groove, and the sliding seat is slidably arranged in the sliding groove; a screw rod, the screw rod passing through the two sliding seats and connected to the sliding seats via a rotating member, the rotating member being rotatably connected to the sliding seats, and the rotating member being threadedly connected to the screw rod; The thread directions of the two rotating parts are opposite. When the screw is driven to move back and forth along the length direction, the two sliding seats can be driven to slide toward or away from each other, thereby driving the mounting seat to move back and forth in a direction perpendicular to the axial direction of the rotating sleeve.

[0009] Optionally, a sliding cavity is provided inside the receiving rod, and the driving part includes: A sliding sleeve is sleeved on the connecting rod and slides in the sliding cavity. A guide is provided between the sliding sleeve and the connecting rod so that the sliding sleeve can only slide back and forth along the axis. The sliding sleeve abuts against the ends of the three screw rods. The active driving component is sleeved on the sliding sleeve and is threadedly connected to the sliding sleeve.

[0010] Optionally, a plurality of elastic members for fixing the active driving member are arranged at intervals on the receiving rod.

[0011] Optionally, the active driving member is a gear, and the passive driving member is an arc-shaped rack. The meshing distance between the gear and the arc-shaped rack during the movement from the loading station to the printing station is set according to the diameter of the printing material.

[0012] Optionally, a plurality of adjustment grooves extending radially are provided at intervals on the rotating disk, the sliding seat is slidably provided in the adjustment grooves, the adjustment assembly includes a sleeve, a pull rod and a fixed ring, the sleeve is fixed to the printing seat, the pull rod is threadedly connected to the sleeve, the fixed ring is fixed to the rotating disk, the pull rod passes through the fixed ring, a driven gear is connected to the pull rod, a driving gear is rotatably connected to the fixed ring, the driving gear is engaged with a plurality of the driven gears, and the driving gear is connected to a motor.

[0013] Optionally, the printing assembly further includes a linear motor, which is connected to the printing seat, and the connecting rod passes through the printing seat and is transmission-connected to the linear motor.

[0014] Optionally, the upper tube assembly includes a lifting seat, two clamping seats slidably arranged on the lifting seat, and a pushing member, and the passive driving member is arranged on the lifting seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In a high-definition curved printing machine provided by an embodiment of the present invention, a cylindrical curved substrate is transported by a conveying unit to an upper tube assembly, which transfers the substrate to a receiving rod. The rotating disk drives the substrate to rotate and contact the printing plate on the printing wheel to achieve printing. The adjustment assembly can drive multiple groups of printing components to move simultaneously along the radial direction of the rotating seat, thereby adjusting the distance between the receiving rod and the printing wheel during printing, greatly increasing the diameter range of the substrate that can be printed. The position of the printing wheel and the printing plate is fixed, which can effectively prevent the printing wheel and the printing plate from offsetting due to mechanical vibration, thereby ensuring printing accuracy. At the same time, after the substrate is sleeved on the receiving rod, the three groups of support members arranged on the rotating sleeve are simultaneously deployed to achieve stable support for the substrate, and the axis of the substrate is aligned with the axis of the receiving rod, so that the contact pressure between the substrate and the printing plate is balanced during printing, which is conducive to further improving printing accuracy. In addition, the rotating sleeve is arranged on the receiving rod. When printing, the substrate rotates, which can drive the rotating sleeve and the three groups of support members to rotate synchronously relative to the receiving rod, which can maintain the stability of the side wall of the substrate during the printing process, which is conducive to improving printing precision and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0018] Figure 1 This is a structural schematic diagram of a high-definition curved printing machine.

[0019] Figure 2 This is a schematic diagram of the structure of the printing plate and upper tube assembly in a high-definition curved printing machine.

[0020] Figure 3 A cross-sectional view of the structure of a printing plate in a high-definition curved printing machine.

[0021] Figure 4 A schematic structural diagram of a printing assembly in a high-definition curved printing press.

[0022] Figure 5 A structural cross-sectional view of a receiving rod in a high-definition curved printing machine.

[0023] Figure 6 Figure 5 A partial enlarged view of part A in the middle.

[0024] Illustration: 100, conveying unit; 200, printing unit; 300, drying unit; 1. Printing wheel; 2. Printing plate; 21. Rotating plate; 22. Printing assembly; 221. Printing seat; 222. Connecting rod; 223. Linear motor; 23. Adjusting assembly; 231. Adjusting slot; 232. Sleeve; 233. Pull rod; 234. Fixing ring; 235. Driving gear; 236. Driven gear; 3. Upper tube assembly; 31. Lifting seat; 32. Clamping seat; 33. Pusher; 4. Diameter adaptation support assembly; 41. Rotating sleeve; 411. Embedded groove; 412. Slide groove; 42. Support member; 43. Support part; 431. Mounting seat; 432. Sliding seat; 433. Connecting rod; 434. Screw; 435. Spring; 44. Driving part; 441. Sliding sleeve; 442. Active driving member; 45. Passive driving member; 46. Elastic member. DETAILED DESCRIPTION

[0025] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0027] An embodiment of the present invention provides a high-definition curved printing machine, comprising a base, a conveying unit, and a printing unit sequentially arranged on the base. The conveying unit comprises an upper tube assembly arranged at the feed end of the printing unit, and the printing unit comprises a printing wheel and a printing plate rotatably mounted on the base. The printing plate comprises: a rotating plate rotatably mounted on the base; a printing assembly movably mounted on the rotating plate, wherein the printing assembly is arranged in a plurality of groups in a circumferential manner, each group of the printing assembly comprising a printing seat and a receiving rod movably mounted on the printing seat; and an adjustment assembly mounted on the rotating plate, the adjustment assembly being used to drive the plurality of printing assembly groups to move simultaneously along the radial direction of the rotating seat. The printing unit further comprises a diameter-adaptive support assembly, which comprises at least a rotating sleeve rotatably mounted on the receiving rod and three groups of support members rotatably connected to the rotating sleeve. The three groups of support members are spaced apart around the axis of the rotating sleeve. By adjusting the opening and closing angles of the three groups of support members, adaptive support is achieved for a substrate within a set diameter range, and the axis of the substrate is aligned with the axis of the receiving rod.

[0028] In a high-definition curved printing machine provided by an embodiment of the present invention, a cylindrical curved substrate is transported by a conveying unit to an upper tube assembly, which transfers the substrate to a receiving rod. The rotating disk drives the substrate to rotate and contact the printing plate on the printing wheel to achieve printing. The adjustment assembly can drive multiple groups of printing components to move simultaneously along the radial direction of the rotating seat, thereby adjusting the distance between the receiving rod and the printing wheel during printing, greatly increasing the diameter range of the substrate that can be printed. The position of the printing wheel and the printing plate is fixed, which can effectively prevent the printing wheel and the printing plate from offsetting due to mechanical vibration, thereby ensuring printing accuracy. At the same time, after the substrate is sleeved on the receiving rod, the three groups of support members arranged on the rotating sleeve are simultaneously deployed to achieve stable support for the substrate, and the axis of the substrate is aligned with the axis of the receiving rod, so that the contact pressure between the substrate and the printing plate is balanced during printing, which is conducive to further improving printing accuracy.

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0030] like Figures 1 to 6 As shown, embodiments of the present invention provide a high-definition curved printing machine for printing on cylindrical substrates such as high-definition tubes and round pipes, as well as inclined tubular substrates such as paper cups and beverage cups. Furthermore, through structural improvements, the present invention offers advantages such as improved machine stability and guaranteed printing accuracy.

[0031] like Figure 1 、 Figure 2 and Figure 3As shown, in this embodiment, the high-definition curved printing press includes a base, a conveying unit 100 and a printing unit 200 sequentially disposed on the base. The printing unit 200 may also be connected to a drying unit 300. The conveying unit 100 may include an automatic tube loading machine, a conveyor belt, and a tube loading assembly 3. The automatic tube loading machine is used to continuously convey the substrate to the conveyor belt, and the conveyor belt can sequentially transfer the substrate to the tube loading assembly 3.

[0032] The printing unit 200 may include a printing wheel and a printing plate 2 that are rotatably arranged on a base. The printing plate 2 includes a rotating plate 21 and a printing assembly 22. The rotating plate 21 is arranged on the base and can be connected to the base through a frame rotation; the printing assembly 22 is arranged on the rotating plate 21. There are multiple groups of printing assemblies 22 that are arranged in a circumferential manner. Any group of printing assemblies 22 includes a printing seat 221 and a connecting rod 222 that is movably inserted on the printing seat 221. The printing wheel 1 can be rotatably connected to the base via side panels. Multiple color groups and a plate cylinder can be mounted on the side panels. A printing plate, which can be a flexible gravure or relief plate, can be mounted on the circumferential wall of the printing wheel 1. The plate cylinder transfers the ink to the printing plate. The upper tube assembly 3 transfers the printed material to the receiving rod 222. During printing, the printing wheel 1 and the rotating disk 21 rotate simultaneously, causing the printing plate to contact the outer wall of the printed material and drive the printed material to rotate through friction. Alternatively, the printing seat 221 can be used to drive the printed material to rotate synchronously, thereby transferring the ink to the printed material. Furthermore, the printing unit may also include a UV component and a glazing component located at the discharge end of the printing disk to initially solidify the printed ink. The printed material is then transported to the drying unit 300 for drying, completing printing.

[0033] Furthermore, the printing plate 2 also includes an adjustment assembly 23, which is disposed on the rotating plate 21 and is used to drive multiple sets of printing assemblies 22 to move simultaneously in the radial direction of the rotating base. The adjustment assembly 23 can drive multiple sets of printing assemblies 22 to move simultaneously in the radial direction of the rotating base, thereby adjusting the distance between the receiving rod 222 and the printing wheel 1 within a set range, greatly increasing the diameter range of the substrate that can be printed. When the substrate diameter is adjusted, the position of the printing wheel 1 and the printing plate 2 is fixed, which can effectively prevent the printing wheel 1 and the printing plate 2 from shifting due to mechanical vibration, thereby ensuring printing accuracy.

[0034] Furthermore, the printing unit 200 also includes a diameter-adaptive support assembly 4, which includes at least a rotating sleeve 41 rotatably sleeved on the receiving rod 222 and three groups of support members 42 rotatably connected to the rotating sleeve 41; the three groups of support members 42 are evenly spaced around the axis of the rotating sleeve 41, and by adjusting the opening and closing angles of the three groups of support members 42, adaptive support for the printing material within the set diameter range is achieved, and the axis of the printing material is made to coincide with the axis of the receiving rod 222.

[0035] Specifically, after the upper tube assembly 3 transfers the printing material to the receiving rod 222, the three groups of support members 42 provided on the rotating sleeve 41 can be simultaneously unfolded, and the three groups of support members 42 are evenly spaced around the axis of the receiving rod 222. Thus, the three groups of support members 42 can be tightly abutted against the inner wall of the printing material, so that the axis of the printing material coincides with the axis of the receiving rod 222. This not only achieves stable support for the printing material, but also facilitates the balance of contact pressure between the printing material and the printing plate during printing, which is conducive to further improving printing accuracy. In addition, the rotating sleeve 41 is rotatably sleeved on the receiving rod 222, so that when printing, the printing material rotates, which can drive the rotating sleeve 41 and the three groups of support members 42 to rotate synchronously relative to the receiving rod 222, and can continuously maintain the stability of the printing material during the printing process, which is conducive to improving printing accuracy and precision.

[0036] For example, support member 42 can be a curved plate with a soft pad placed on its surface to accommodate substrates of varying diameters. This ensures sufficient friction between support member 42 and the substrate, effectively preventing the substrate from slipping during rotation and ensuring printing accuracy. Furthermore, the soft pad can effectively prevent damage to the substrate's inner wall. Of course, support member 42 can also be constructed with a hard pad or roller for different substrate materials or printing methods. In this case, the substrate can be independently rotated using a motor.

[0037] It should be noted that the diameter of the rotating sleeve 41 can be the same as the diameter of the connecting rod 222. A groove section can be opened on one side of the connecting rod 222 close to the end, and the diameter of the groove section is smaller than the diameter of the two sides. The rotating sleeve 41 can be located in the groove section and movably sleeved on the outside of the groove section of the connecting rod 222, and the three groups of support members 42 can be embedded and installed in the rotating sleeve 41. When the three groups of support members 42 are not unfolded, the outer end faces of the support members 42 are flush with the outer peripheral wall of the rotating sleeve 41, which facilitates the smooth sleeveing ​​of the printing material on the connecting rod 222.

[0038] For example, the rotating disk 21 is provided with a plurality of radially extending adjustment slots 231 spaced apart from each other, and the printing base 221 is slidably disposed in the adjustment slots 231. The adjustment assembly 23 includes a sleeve 232, a pull rod 233, and a fixing ring 234. The sleeve 232 is fixed to the printing base 221, the pull rod 233 is threadedly connected to the sleeve 232, and the fixing ring 234 is fixed to the rotating disk 21. The pull rod 233 passes through the fixing ring 234. A driven gear 236 is connected to the pull rod 233, and a driving gear 235 is rotatably connected to the fixing ring 234. The driving gear 235 meshes with the plurality of driven gears 236, and the driving gear 235 is connected to a motor. For example, when the motor is started, it drives the driving gear 235 to rotate, thereby driving multiple driven gears 236 to rotate, and then driving multiple pull rods 233 to rotate, and then driving the printing seat 221 through the sleeve 232 to move in the adjustment groove 231 along the radial direction of the rotating disk 21, so as to adjust the distance between the receiving rod 222 and the printing wheel 1 to adapt to printing materials of different diameters.

[0039] For example, the printing assembly 22 may further include a linear motor 223 connected to the printing base 221. The connecting rod 222 extends through the sliding base 432 and is in transmission connection with the linear motor 223. When the linear motor 223 is activated, it can drive the connecting rod 222 to move along its axis to adjust the length of the connecting rod 222 near the upper tube assembly 3, thereby accommodating substrates of varying depths and further improving the adaptability of the curved printing press.

[0040] like Figure 4 、 Figure 5 and Figure 6 As shown, in this embodiment of the present invention, the diameter-adaptive support portion 43 further includes a support portion 43, a drive portion 44, and a passive drive member 45. The support portion 43 is provided on the rotating sleeve 41 and is used to drive the support member 42 to reciprocate in a direction perpendicular to the axis of the rotating sleeve 41. The drive portion 44 is provided on the rotating sleeve 41 and is used to drive the support portion 43 to operate when the drive portion 44 is activated. The passive drive member 45 is connected to the upper tube assembly 3 and is capable of activating the drive portion 44. During the rotation of the rotating disk 21, the printing assembly 22 closest to the printing wheel 1 is the printing station, and the printing assembly 22 closest to the upper tube assembly 3 is the loading station. Specifically, the upper tube assembly 3 sleeves the printing material onto the receiving rod 222 at the loading station. When the rotating disk 21 rotates and the receiving rod 222 moves from the loading station to the printing station, the drive portion 44 is activated by the passive drive member 45 to drive the three groups of support members 42 to expand a corresponding distance.

[0041] Specifically, when the drive unit 44 is activated, it drives the support unit 43 to operate, thereby simultaneously deploying the three sets of support members 42 to support the printed material. The drive unit 44 can be actively controlled before printing or passively controlled during printing using the passive drive member 45. Therefore, the method for deploying the three sets of support members 42 can be selected based on actual needs. For example, when the substrate is cylindrical with a uniform sidewall diameter, the three sets of support members 42 can be adjusted to a corresponding degree of expansion by the drive unit 44 before printing begins. After the upper tube assembly 3 transfers the substrate to the receiving rod 222, it can directly provide stable support for the substrate. When the substrate is truncated with an inclined sidewall, for example, the diameter of the substrate opening is smaller than the diameter of the middle, the three sets of support members 42 can be retracted to allow the substrate to be smoothly placed on the receiving rod 222. After the substrate is transferred to the receiving rod 222 at the loading station, the rotating disk 21 rotates and drives the substrate toward the printing station. During this movement, the drive unit 44 is activated by the passive drive member 45, thereby driving the three sets of support members 42 to expand and provide support for the substrate. This is conducive to improving the adaptability of the curved printing press to substrates.

[0042] like Figure 4 、 Figure 5 and Figure 6 As shown, in the embodiment of the present invention, three embedding grooves 411 are evenly spaced around the axis on the side wall of the rotating sleeve 41, and each embedding groove 411 is provided with a group of support members 42 and a group of support parts 43, and the support parts 43 include: The mounting seat 431 is connected to the embedded groove 411 through a connecting rod 433. One end of the connecting rod 433 is rotatably connected to the mounting seat 431. Two connecting rods 433 are symmetrically provided. The support member 42 is rotatably connected to the mounting seat 431. The sliding seat 432, the other end of the connecting rod 433 is rotatably connected to the sliding seat 432, the bottom of the embedding groove 411 is provided with a sliding groove 412 extending along the length direction of the rotating sleeve 41, and the sliding seat 432 is slidably arranged in the sliding groove 412; The screw 434 passes through the two sliding seats 432 and is connected to the sliding seats 432 via a rotating member. The rotating member is rotatably connected to the sliding seats 432 and is threadedly connected to the screw 434; The two rotating parts have opposite thread directions. When the screw rod 434 is driven to move back and forth along the length direction, the two sliding seats 432 can be driven to slide toward or away from each other, thereby driving the mounting seat 431 to move back and forth in a direction perpendicular to the axial direction of the rotating sleeve 41.

[0043] Specifically, the middle part of the lower end face of the support member 42 is rotatably connected to the mounting seat 431, and springs 435 are provided on both sides of the mounting seat 431 along the length direction of the support member 42. When the support member 42 is in a horizontal state, the two springs 435 are in contact with the lower end face of the support member 42. When the printing material is in the shape of a truncated cone with a side wall having an inclined angle, the support member 42 rotates and can fit tightly with the inner wall of the printing material, thereby facilitating stable support for printing materials of different shapes. The mounting seat 431 is rotatably connected to the end face of the supporting member 42 with two connecting rods 433, and the two connecting rods 433 are symmetrically arranged and connected to the middle part of the mounting seat 431; a sliding groove 412 is provided at the bottom of the embedding groove 411, and the sliding groove 412 extends along the length direction of the supporting member 42. The sliding seat 432 is slidably arranged in the sliding groove 412, and the two connecting rods 433 are rotatably connected to the sliding seat 432. When the two sliding seats 432 approach each other or move away from each other, the mounting seat 431 can be driven to move toward or away from the bottom of the embedding groove 411; the screw 434 passes through the two sliding seats 432, and a rotating member is provided on the sliding seat 432 at the position where the screw 434 passes through. The rotating member is rotatably connected to the sliding seat 432 and is threadedly connected to the screw 434. The threads of the rotating members on the two sliding seats 432 are arranged in opposite directions. When the screw rod 434 is pushed along its length, the rotating member is driven to rotate and move along the length of the screw rod 434, thereby driving the two sliding seats 432 to move toward or away from each other, and further driving the support member 42 to move toward or away from the bottom of the embedding groove 411. By pushing the screw rods 434 of the three groups of support parts 43 simultaneously, the three groups of support members 42 can be expanded or contracted simultaneously.

[0044] In the embodiment of the present invention, a sliding cavity is provided inside the receiving rod 222, and the driving part 44 includes: The sliding sleeve 441 is sleeved on the receiving rod 222 and slides in the sliding cavity. A guide is provided between the sliding sleeve 441 and the receiving rod 222 so that the sliding sleeve 441 can only slide back and forth along the axis. The sliding sleeve 441 abuts against the ends of the three screw rods 434. The active driving member 442 is sleeved on the sliding sleeve 441 and threadedly connected to the sliding sleeve 441 .

[0045] Specifically, an annular sliding cavity along the length direction is opened inside the receiving rod 222, the sliding sleeve 441 is arranged in the sliding cavity and movably sleeved on the receiving rod 222, and a guide member is arranged between the sliding sleeve 441 and the receiving rod 222, for example, a guide bar is provided on the sliding sleeve 441, and a guide groove matching the guide bar is provided on the receiving rod 222, so that the sliding sleeve 441 can only slide along the length direction of the receiving rod 222; the active driving member 442 is sleeved on the outside of the sliding sleeve 441, and the outer peripheral wall of the active driving member 442 is flush with the outer peripheral wall of the receiving rod 222, the active driving member 442 is threadedly connected to the sliding sleeve 441, and when the active driving member 442 is rotated, the sliding sleeve 441 can be driven to move along the length direction of the receiving rod 222. The sliding sleeve 441 is connected to the three screw rods 434 , so that when the sliding sleeve 441 moves back and forth, it can push the three screw rods 434 to move back and forth, thereby driving the two sliding seats 432 to move closer to or away from each other, and then driving the three groups of support members 42 to expand or contract.

[0046] Furthermore, the three screws 434 are connected to the sliding sleeve 441 and can rotate relative to the sliding sleeve 441. For example, the ends of the three screws 434 can be fixedly connected to an annular plate, which is mounted on the receiving rod 222. A ring sleeve is rotatably mounted on the outer ring of the annular plate, and the sliding sleeve 441 can be connected to the ring sleeve via a sliding rod. Thus, the sliding sleeve 441 can drive the three screws 434 to reciprocate without interfering with the rotation of the rotating sleeve 41 around the receiving rod 222.

[0047] For example, a plurality of elastic members 46 for fixing the active drive member 442 are provided at intervals on the connecting rod 222. After the active drive member 442 is rotated to expand the three groups of support members 42 to the position corresponding to the substrate, the elastic member 46 can be used to fix the active drive member 442 to prevent the expansion distance of the three groups of support members 42 from changing, thereby ensuring continuous support for the substrate. At the same time, the spacing of the elastic members 46 can be set according to the diameter of different substrates, and auxiliary scales can be processed on the connecting rod to achieve precise control of the rotation angle of the active drive member 442, so as to facilitate precise and rapid control according to the diameter of the substrate. Of course, the fixing method of the active drive member 442 can also be achieved by means of buckles, bolts, etc., and the present invention does not make special restrictions on this.

[0048] In an exemplary embodiment of the present invention, the active driving member 442 is a gear, and the passive driving member 45 is an arc-shaped rack. The meshing distance between the gear and the arc-shaped rack during the movement from the loading station to the printing station is set according to the diameter of the substrate. For example, when the substrate is in a shape with an opening diameter smaller than the middle diameter, the expansion distance of the support member 42 is determined according to the diameter of the supported portion 43 of the substrate, and the rotation angle of the gear is set accordingly, so that the length of the rack can be obtained. Before starting printing, the arc-shaped rack is set on the rotation path of the gear at the rear end of the loading station. Therefore, when the receiving rod 222 moves from the loading station to the printing station, the gear and the rack mesh and rotate to drive the three groups of support members 42 to expand to the set position to support the substrate.

[0049] In one embodiment of the present invention, the upper tube assembly 3 includes a lifting seat 31, two clamping seats 32 slidably mounted on the lifting seat 31, and a pusher 33. A passive drive member 45 is disposed on the lifting seat 31. Specifically, by adjusting the height of the lifting seat 31 and the spacing between the two clamping seats 32, substrates of different diameters can be pre-fixed. This ensures that the axis of the substrate aligns with the axis of the connecting rod 222 before being transferred to the connecting rod 222. The pusher 33 then pushes the substrate toward the connecting rod 222, facilitating accurate transfer of the substrate to the connecting rod 222 and improving substrate stability, thereby further ensuring printing accuracy.

[0050] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-definition curved surface printing machine, comprising a base, a conveying unit (100) and a printing unit (200) sequentially arranged on the base, wherein the conveying unit (100) comprises an upper tube assembly (3) arranged at a feeding end of the printing unit (200), and the printing unit (200) comprises a printing wheel (1) and a printing plate (2) rotatably arranged on the base, characterized in that: The printed disk (2) comprises: A rotating disk (21) rotatably mounted on the base; A printing assembly (22) is movably arranged on the rotating disk (21), and the printing assembly (22) is arranged in a plurality of groups at intervals in a surrounding manner, and any group of the printing assembly (22) includes a printing seat (221) and a receiving rod (222) movably inserted on the printing seat (221); An adjusting assembly (23) is provided on the rotating disk (21), and the adjusting assembly (23) is used to drive the plurality of printing assemblies (22) to move simultaneously along the radial direction of the rotating disk (21); The printing unit (200) further comprises a diameter-adaptive support assembly (4), the diameter-adaptive support assembly (4) comprising at least a rotating sleeve (41) rotatably sleeved on the receiving rod (222) and three groups of support members (42) rotatably connected to the rotating sleeve (41); The three groups of support members (42) are spaced apart around the axis of the rotating sleeve (41). By adjusting the opening and closing degree of the three groups of support members (42), adaptive support for a printing material within a set diameter range is achieved, and the axis of the printing material is made to coincide with the axis of the receiving rod (222).

2. The high-definition curved surface printing machine according to claim 1, characterized in that: The diameter-adapting support portion (43) further comprises: A support portion (43) is provided on the rotating sleeve (41) and is used to drive the support member (42) to move back and forth in a direction perpendicular to the axis of the rotating sleeve (41); A driving portion (44) is provided on the rotating sleeve (41), and is used to drive the supporting portion (43) to operate when the driving portion (44) is started; A passive driving member (45) is connected to the upper tube assembly (3), and the passive driving member (45) is capable of starting the driving part (44); During the rotation of the rotating disk (21), the printing assembly (22) closest to the printing wheel (1) is a printing station, and the printing assembly (22) closest to the upper tube assembly (3) is a loading station; The upper tube assembly (3) sleeves the printing material onto the receiving rod (222) at the loading station. When the receiving rod (222) moves from the loading station to the printing station, the driving part (44) is activated by the passive driving part (45) to drive the three groups of support members (42) to expand a corresponding distance.

3. The high-definition curved surface printing machine according to claim 2, characterized in that: Three embedding grooves (411) are evenly spaced around the axis on the side wall of the rotating sleeve (41), and each embedding groove (411) is provided with a group of the supporting members (42) and a group of the supporting parts (43), and the supporting parts (43) include: The mounting seat (431) is connected to the embedding groove (411) via a connecting rod (433), one end of the connecting rod (433) is rotatably connected to the mounting seat (431), two connecting rods (433) are symmetrically provided, and the support member (42) is rotatably connected to the mounting seat (431); A sliding seat (432), the other end of the connecting rod (433) is rotatably connected to the sliding seat (432), a sliding groove (412) extending along the length direction of the rotating sleeve (41) is opened at the bottom of the embedding groove (411), and the sliding seat (432) is slidably arranged in the sliding groove (412); a screw rod (434), the screw rod (434) passing through the two sliding seats (432) and connected to the sliding seats (432) via a rotating member, the rotating member being rotatably connected to the sliding seats (432), and the rotating member being threadedly connected to the screw rod (434); The two rotating members have opposite thread directions, and when the screw rod (434) is driven to move back and forth along the length direction, the two sliding seats (432) can be driven to slide in directions approaching or away from each other, thereby driving the mounting seat (431) to move back and forth in a direction perpendicular to the axial direction of the rotating sleeve (41).

4. The high-definition curved surface printing machine according to claim 3, characterized in that: A sliding cavity is provided inside the receiving rod (222), and the driving part (44) includes: A sliding sleeve (441) is sleeved on the connecting rod (222) and slides in the sliding cavity. A guide is provided between the sliding sleeve (441) and the connecting rod (222) so that the sliding sleeve (441) can only slide back and forth along the axial direction. The sliding sleeve (441) abuts against the ends of the three screw rods (434); An active driving member (442) is sleeved on the sliding sleeve (441) and is threadedly connected to the sliding sleeve (441).

5. The high-definition curved surface printing machine according to claim 4, characterized in that: A plurality of elastic members (46) for fixing the active driving member (442) are arranged at intervals on the receiving rod (222).

6. The high-definition curved surface printing machine according to claim 4, characterized in that: The active driving member (442) is a gear, and the passive driving member (45) is an arc-shaped rack. The meshing distance between the gear and the arc-shaped rack during the movement from the loading station to the printing station is set according to the diameter of the printing material.

7. The high-definition curved surface printing machine according to claim 1, characterized in that: The rotating disk (21) is provided with a plurality of adjustment grooves (231) extending radially at intervals, the sliding seat (432) is slidably arranged in the adjustment grooves (231), the adjustment assembly (23) comprises a sleeve (232), a pull rod (233) and a fixing ring (234), the sleeve (232) is fixed to the printing seat (221), the pull rod (233) is threadedly connected to the sleeve (232), the fixing ring (234) is fixed to the rotating disk (21), the pull rod (233) passes through the fixing ring (234), a driven gear (236) is connected to the pull rod (233), a driving gear (235) is rotatably connected to the fixing ring (234), the driving gear (235) is meshed with the plurality of driven gears (236), and the driving gear (235) is connected to a motor.

8. The high-definition curved surface printing machine according to claim 1, characterized in that: The printing assembly (22) further comprises a linear motor (223), wherein the linear motor (223) is connected to the printing seat (221), and the connecting rod (222) passes through the printing seat (221) and is transmission-connected to the linear motor (223).

9. The high-definition curved surface printing machine according to claim 2, characterized in that: The upper tube assembly (3) comprises a lifting seat (31), two clamping seats (32) slidably arranged on the lifting seat (31), and a pushing member (33); the passive driving member is arranged on the lifting seat (31).

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