A surface thermal printing apparatus

Abstract

The present application belongs to the technical field of printing, and particularly relates to a surface thermal printing device, which comprises a rotatable turntable, a top end and left and right ends of the front side of the turntable are respectively provided with a printing position, a feeding position and a discharging position; a plurality of workpiece fixing positions are sequentially arranged in a clockwise direction on the turntable from the feeding position to the discharging position; a positioning mechanism is arranged on the workpiece fixing position and extends into the inside of the box body workpiece for fixing; the positioning mechanism has a plurality of movable blocks which are arranged in a circumferential direction and can move towards the center; in the positioning state, the annular structure formed by the plurality of movable blocks expands outward and abuts against the inner side wall of the box body workpiece; during processing, the movable blocks which can move towards the inner wall of the box body workpiece abut against the inner wall of the box body workpiece, thereby realizing the internal fixation of the box body workpiece, and further providing more operation space for the printing and processing of the outer side wall of the box body workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the printing technical field, and particularly relates to a surface thermal printing device. BACKGROUND

[0002] With the continuous development of industrial technology, printing process technology has also changed a lot. Not only limited to screen printing and gold stamping technology, various printing technologies have their own advantages and disadvantages, and the only disadvantage is that they cannot solve the printing of irregular products, especially the special-shaped combined workpiece, such as cylindrical box body or square combined body. However, the thermal transfer printing and gold stamping equipment technology fills the gap in this aspect. The irregularity of the special-shaped box body printing meets the demand of pad printing.

[0003] However, in the printing process, the special-shaped box body needs to be fixed. The conventional method in the industry is to clamp the two ends of the box body with a clamping mechanism and rotate synchronously to facilitate printing on the four side walls. However, this method has a disadvantage that the clamped part of the box body workpiece will block part of the surface of the workpiece, which may cause incomplete printing in some cases. Therefore, in order to solve this problem, our company specially develops a new type of printing equipment. SUMMARY

[0004] The present application aims to provide a surface thermal printing device to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a surface thermal printing device, comprising a vertically rotatable turntable, the top end and the left and right ends of the front side of the turntable are respectively provided with a printing position, a feeding position and a discharging position; a plurality of workpiece fixing positions are arranged in the clockwise direction from the feeding position to the discharging position on the turntable, a positioning mechanism is arranged on the workpiece fixing position to fix into the inside of the box body workpiece, the positioning mechanism has a plurality of movable blocks arranged in the circumferential direction and capable of reciprocating centripetally; in the positioning state, the annular structure composed of the plurality of movable blocks expands outward and abuts against the inner side wall of the box body workpiece.

[0006] The surface thermal printing device provided by the present application, wherein the positioning mechanism comprises a positioning shaft arranged in the front-rear direction and connected with the turntable in rotation, and a positioning seat arranged at the front end of the positioning shaft; the positioning seat is provided with a movable block capable of reciprocating in the radial direction of the positioning shaft, and the positioning mechanism further comprises an outward expansion module for driving the movable block to reciprocate.

[0007] The surface thermal printing device, wherein an active through hole is arranged in the positioning shaft in the axial direction and penetrates both ends of the positioning shaft, and an inner cavity is arranged in the positioning seat and communicates with the active through hole; the outer expansion module comprises an active rod member arranged in the active through hole in the axial direction and extending into the inner cavity at the front end, and a reciprocating driving assembly for driving the active rod member to reciprocate in the axial direction; the front end of the active rod member is hinged with a connecting arm, and one end of the connecting arm away from the active rod member is hinged with the active block.

[0008] The surface thermal printing device, wherein the reciprocating driving assembly comprises a ring member coaxially arranged on the positioning shaft, a connecting rod connecting the ring member and the active rod member, and a positioning driving unit for driving the ring member to reciprocate in the axial direction; the positioning shaft is provided with a avoiding hole for the active connecting rod, and a annular groove is coaxially arranged on the outer peripheral sidewall of the ring member, and a push rod is arranged on the active end of the positioning driving unit and extends into the annular groove.

[0009] The surface thermal printing device, wherein the device further comprises a gold stamping printing module arranged above the rotating disc and used for printing the box body workpiece fixed on the positioning mechanism, a first driving mechanism arranged at the top of the rear side of the rotating disc and used for driving the positioning mechanism to rotate around the shaft, and a clutch type transmission mechanism which is actuated when the box body workpiece moves to the printing position and is transmissionally connected with the first driving mechanism and the positioning mechanism.

[0010] The surface thermal printing device, wherein the clutch type transmission mechanism comprises a first engagement member arranged at the rear end of the positioning shaft, a second engagement member which is separable or connectable with the first engagement member, and a separation driving module for driving the second engagement member to connect or separate with the first engagement member; the second engagement member is arranged on the rotating shaft of the first driving mechanism, and the first driving mechanism is arranged on the active end of the separation driving module.

[0011] The surface thermal printing device, wherein the device further comprises a support frame arranged at the front side of the rotating disc, a workpiece positioning rod arranged on the support frame in the front-rear direction, and a workpiece positioning disc vertically fixed at the rear end of the workpiece positioning rod; the workpiece positioning rod is longitudinally rotationally connected with the support frame, and in the positioning state, the rear sidewall of the workpiece positioning disc is coaxially abutted with the front end of the box body workpiece.

[0012] The surface thermal printing device, wherein the device further comprises a second driving mechanism for driving the rotating disc to rotate, the rotating disc is transmissionally connected with the output shaft of the second driving mechanism through a driving shaft, and a channel is arranged in the driving shaft and penetrates both ends of the driving shaft.

[0013] The surface thermal printing equipment, wherein the equipment further comprises an upper feeding mechanism and a lower feeding mechanism respectively arranged at the upper feeding position and the lower feeding position.

[0014] The surface thermal printing equipment, wherein the upper feeding mechanism and the lower feeding mechanism each comprise a conveying belt arranged in a left-right direction, and a suction disc module arranged above a front side of the conveying belt and movable forward and backward; the upper feeding mechanism further comprises a transfer table arranged between the conveying belt and the suction disc module, and a material moving manipulator for moving the box body workpiece to the transfer table

[0015] Compared with the prior art, the present application has the following advantages: during processing, the movable block movable towards the inner wall of the box body workpiece abuts against the inner wall of the box body workpiece, thereby fixing the box body workpiece from the inside, and thereby providing more operation space for printing processing of the outer side wall of the box body workpiece, which can completely avoid the problem that the part clamping the box body workpiece is blocked and the printing cannot be completely performed, and greatly improves the printing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0017] Figure 1 is a structural schematic diagram of the present application.

[0018] Figure 2 is a top view of the present application.

[0019] Figure 3 is a rear view of the present application.

[0020] Figure 4 is Figure 3 is an enlarged view of the partial structure in

[0021] Figure 5 is a front view of the present application.

[0022] Figure 6 is an isolated view of the rotating disc and the positioning mechanism assembly of the present application.

[0023] Figure 7 is Figure 6 is an enlarged view of the partial structure in

[0024] Figure 8 is Figure 7 is a bottom view of the present application.

[0025] Figure 9 is a front view of Figure 6

[0026] Figure 10 is a sectional view of A-A in Figure 9 DETAILED DESCRIPTION

[0027] The terms "first", "second", "third", and "fourth" and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of use in either order. Furthermore, the term "comprising" as used in the specification includes the meaning that can be at least partially extraneous to the listed steps or elements. For example, a process, method, system, product or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements, but can optionally further include additional steps or elements that are not expressly listed or inherent to such process, method, system, product or apparatus.

[0028] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely possible examples of one or more implementations and are thus not set forth with the intention of implying that such embodiments are the only possible implementations. Embodiments of the application can be combined with other embodiments of the application.

[0029] "Multiple" means two or more. "And / or", describing the association relationship of the associated objects, means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0030] Moreover, the terms "upper", "lower", "left", "right", "top", "bottom", "vertical", and the like, indicating the position of the device or equipment in the normal use of the device or equipment.

[0031] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the technical solutions in the embodiments of the present application to make a clear and complete description. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0032] The embodiments disclose a method for Figures 1 to 10 ​​The surface thermal printing device is shown, the rotating disc 10 can be vertically rotated, the rotating disc 10 is circular in particular, the base mounting plate 20 is vertically arranged at the rear side of the rotating disc 10, and the rotating disc 10 is rotationally connected with the base mounting plate 20 through a hollow rotating shaft (not shown in the figure). The top end and the left and right ends of the front side of the rotating disc 10 are respectively provided with a printing position, a feeding position and a discharging position; a plurality of workpiece fixing positions are arranged on the rotating disc 10 in the clockwise direction from the feeding position to the discharging position, and a positioning mechanism 30 is arranged on each workpiece fixing position and extends into the inside of the box body workpiece and fixes the same; the positioning mechanism 30 has a plurality of movable blocks 3a which are arranged in the circumferential direction and can move towards the center in a reciprocating manner; in the positioning state, the annular structure formed by the plurality of movable blocks 3a expands outward and abuts against the inner side wall of the box body workpiece, wherein the outer side wall of the movable block 3a can be arranged in a corresponding shape according to the shape of the inner wall of the box body workpiece; if the box body workpiece is cylindrical, the outer side wall of the movable block 3a is directly arranged in an arc shape; if the inner side wall of the box body workpiece is a prism structure, a convex corner can be arranged on the arc surface to correspond to the recessed part at the position of the corner of the inner wall of the box body workpiece; of course, the arc surface or the convex corner can also be realized by independent and detachable positioning blocks 3a1.

[0033] During processing, the movable block 3a which can move towards the inner wall of the box body workpiece abuts against the inner wall of the box body workpiece, thereby fixing the box body workpiece from the inside, and thereby providing more operation space for the printing processing of the outer side wall of the box body workpiece; compared with the traditional clamping scheme which can cause the part clamping the box body workpiece to be blocked and cause the printing to be unable to be completely performed, the present scheme can completely avoid the occurrence of such problem, and the printing effect is greatly improved.

[0034] In the embodiment, the positioning mechanism 30 comprises a positioning rotating shaft 31 arranged in the front-rear direction and rotationally connected with the rotating disc 10, and a positioning seat 32 arranged at the front end of the positioning rotating shaft 31; wherein the rear end of the positioning rotating shaft 31 penetrates the rotating disc and is adjacent to the base mounting plate; the positioning seat 32 is provided with movable blocks 3a which can reciprocate in the radial direction of the positioning rotating shaft 31. The positioning mechanism 30 further comprises an outward expansion module 33 for driving the movable blocks 3a to reciprocate. Specifically, the positioning rotating shaft 31 is coaxially provided with an activity through hole 311 penetrating both ends thereof in the axial direction. The positioning seat 32 is provided with an inner cavity 321 coaxial with and communicating with the activity through hole 311, the diameter of the inner cavity 321 is larger than that of the activity through hole 311 and the inner cavity 321 is specifically in the shape of a cuboid. The long side of the inner cavity 321 is parallel to the axial direction of the activity through hole 311 and coaxial with the axis of the activity through hole 311. The outward expansion module 33 comprises an activity rod 331 axially arranged in the activity through hole 311 and extending into the inner cavity 321 at the front end, the rear end of the activity rod 331 is in the shape of a cylinder and is in sliding fit with the inner wall of the activity through hole 311, so as to avoid the shaking of the positioning rotating shaft 31.

[0035] Further, the outward expansion module 33 further comprises a reciprocating driving assembly 332 for driving the active rod member 331 to axially reciprocate, and a connecting arm 40 is hingedly connected to the front end of the active rod member 331, and the end of the connecting arm 40 away from the active rod member 331 is hingedly connected to the active block 3a, the hinging shafts at both ends of the connecting arm 40 are parallel to each other and perpendicular to the active rod member 331, and an active hole 3210 is arranged on the inner wall of the inner cavity 321 to avoid the connecting arm 40, so as to facilitate the installation of the connecting arm 40 extending out of the inner cavity 321 and being hingedly connected to the active block 3a. In the initial state, the end of the connecting arm 40 hingedly connected to the active block 3a faces forward, and the end connected to the positioning shaft 31 faces backward, that is, the included angle between the connecting arm 40 and the active rod member 331 is an acute angle, so that when the reciprocating driving assembly 332 drives the active rod member 331 to move forward, the active block 3a is pushed outward and radially by the connecting arm 40 and abuts against the inner wall of the box body workpiece, thereby achieving the fixation of the box body workpiece.

[0036] In the initial state, the end of the connecting arm 40 hingedly connected to the active block 3a faces forward, and the end connected to the positioning shaft 31 faces backward, that is, the included angle between the connecting arm 40 and the active rod member 331 is an acute angle, so that when the reciprocating driving assembly 332 drives the active rod member 331 to move forward, the active block 3a is pushed outward and radially by the connecting arm 40 and abuts against the inner wall of the box body workpiece, thereby achieving the fixation of the box body workpiece.

[0037] In addition, in order to ensure the stability of the active rod member 331, a guide rail 60 is further arranged in the inner cavity 321 for axially guiding the front end of the active rod member 331.

[0038] In the embodiment, the reciprocating driving assembly 332 can be arranged in the active through hole 311 or outside the active through hole 311. If the former arrangement is adopted, the diameter of the positioning shaft 31 needs to be increased to expand the internal space to meet the installation requirements. In comparison, the latter arrangement is preferred in the present scheme, and the installation and driving of the reciprocating driving assembly 332 are more convenient and optional.

[0039] Specifically, the reciprocating driving assembly 332 comprises a ring 3321 coaxially movably sleeved on the positioning shaft 31, a connecting rod 3322 connecting the ring 3321 and the movable rod 331, and a positioning driving unit 3323 driving the ring 3321 to axially reciprocate; wherein the positioning driving unit 3323 is a cylinder, and can also be a lead screw motor module or an oil cylinder, etc. linear driving module; the ring 3321 and the movable rod 331 are detachably connected with the connecting rod 3322 by bolts, and the connecting rod 3322 is provided with a plurality of connecting rods 3322 and is provided with equidistant distribution along the circumferential direction of the positioning shaft 31. Further, the positioning shaft 31 is provided with a avoiding hole 70 for the reciprocating movement of the connecting rod 3322, which is long strip-shaped and its length is greater than or equal to the stroke of the movable rod 331, so as to ensure the normal movement of the movable rod 331.

[0040] Further, an annular groove 80 is coaxially provided on the outer peripheral side wall of the ring 3321, and a push rod 90 is provided on the movable end of the positioning driving unit 3323 and extends into the annular groove 80. When the positioning driving unit 3323 is actuated, the movable rod 331 can be pushed forward or backward by the cooperation of the push rod 90, the ring 3321 and the connecting rod 3322, thereby realizing the expansion or contraction of the annular structure composed of the plurality of movable blocks 3a. When expanded, the inner wall of the box body workpiece can be positioned, and when contracted, the box body workpiece can be removed for the next step of processing. Moreover, through the limiting cooperation of the annular groove and the extension push rod 90, the positioning shaft 31 can be rotated while the movable rod 331 is driven to axially reciprocate synchronously.

[0041] Specifically, the push rod 90 is U-shaped and its two arms are located on the left and right sides of the positioning shaft 31, and the positioning driving unit 3323 is arranged on the lower side of the positioning shaft 31 and the end of the piston rod is connected with the lower end of the push rod 90. Further, in order to reduce the friction between the two ends of the push rod 90 and the inner wall of the annular groove 80, a bearing 100 is arranged on each arm of the push rod 90, the rotating shaft of the bearing 100 passes through the horizontal diameter of the positioning shaft 31, and the diameter of the bearing 100 is matched with the width of the annular groove 80. In actual assembly, the bearing 100 and the width of the annular groove 80 have a certain machining error, which can facilitate the relative rolling of the bearing 100 and the ring 3321.

[0042] In the embodiment, the apparatus further comprises a gold stamping and printing module 110 arranged above the turntable 10 and configured to print the box workpiece fixed on the positioning mechanism 30, a first driving mechanism 120 arranged at the top of the rear side of the turntable 10 and configured to drive the positioning mechanism 30 to rotate around the axis, and a clutch type transmission mechanism 130 configured to act when the printed box workpiece moves to the printing position and drivingly connected to the first driving mechanism 120 and the positioning mechanism 30; specifically, the clutch type transmission mechanism 130 comprises a first engaging member 131 arranged at the rear end of the positioning rotating shaft 31, a second engaging member 132 separable from or connectable to the first engaging member 131, and a separation driving module 133 configured to drive the second engaging member 132 to connect or separate from the first engaging member 131; the second engaging member 132 is coaxially arranged on the rotating shaft of the first driving mechanism 120, and the first driving mechanism 120 is arranged on the movable terminal of the separation driving module; wherein the separation driving module 133 is a pneumatic cylinder, and of course, a conventional linear mechanism such as a lead screw motor or a linear motor can also be used; when the separation driving module 133 acts, the first driving mechanism 120 and the second engaging member can be driven to move, so that the second engaging member is connected or separated from the first engaging member; further, the first engaging member 131 can be a shaft member or a plate member with a pin hole, and the second engaging member 132 is a block member or a plate member or a shaft member with a pin shaft that can be matched with the pin hole; if only one pin hole is arranged, the cross section must be non-circular, and if multiple pin holes are arranged, the shape is not limited; of course, either the first engaging member 131 or the second engaging member 132 can be a strong magnet, and the other can be a ferromagnetic object; or either the first engaging member 131 or the second engaging member 132 can be an electromagnet, and the other can be a ferromagnetic object; the present scheme preferentially selects the cooperation mode that the second engaging member 132 is an electromagnet and the first engaging member 131 is a ferromagnetic object; when the positioning rotating shaft 31 rotates to the printing position, the first driving mechanism 120 can drive the positioning rotating shaft 31 to rotate through the adsorption cooperation of the electromagnet and the ferromagnetic first engaging member 131.

[0043] The gilding printing module 110 can be implemented by using a gilding module commonly used in the market to reduce the cost investment and facilitate the after-sales guarantee. The specific structure includes a roller shaft gilding head 111 parallel to the rotating shaft of the rotating disc 10, a gilding rotating unit 112 for driving the roller shaft gilding head 111 to rotate, an XZ two-axis driving module 113 for driving the roller shaft gilding head 111 to move up and down and left and right, and a gilding material belt feeding module 114 arranged on the left and right sides of the roller shaft gilding head 111. The gilding rotating unit 112 and the roller shaft gilding head 111 are arranged on the movable terminal of the XZ two-axis driving module 113. The gilding rotating unit 112 is generally a servo motor, and the X-axis of the XZ two-axis driving module 113 is mounted on the base mounting plate 20, and the Z-axis is mounted on the movable terminal of the X-axis. The gilding rotating unit 112 and the roller shaft gilding head 111 are arranged on the movable terminal of the Z two-axis, so that the gilding rotating unit 112 and the roller shaft gilding head 111 can move left and right and up and down. Further, the gilding material belt feeding module 114 generally includes two material discs 1141 opposite to each other, a roller shaft cylinder 1142 for tightening the material belt, one of the material discs 1141 is used to supply the material belt 400, and the other is used to wind the waste material belt 500 after gilding. The two material discs 1141 can be independently driven by two motors. During printing, the material belt is located between the roller shaft gilding head and the box body workpiece. When the roller shaft gilding head moves down, the material belt is pressed and attached to the outer side wall of the box body workpiece, and the pattern on the material belt is printed on the box body workpiece by heating and pressing.

[0044] In the embodiment, the device further includes a support frame 140 arranged on the front side of the rotating disc 10, a workpiece positioning rod 150 arranged on the support frame 140 in the front-rear direction, and a workpiece positioning disc 160 fixed vertically on the rear end of the workpiece positioning rod 150. The workpiece positioning rod 150 is longitudinally connected with the support frame 140. In the positioning state, the rear side wall of the workpiece positioning disc 160 is coaxially abutted with the front end of the box body workpiece to provide necessary support for the front end of the box body workpiece during printing to avoid downward deflection under pressure. In order to avoid interfering with the rotation of the rotating disc 10, the support frame 140 is further provided with a positioning cylinder 170 for driving the workpiece positioning rod 150 to move forward and backward to realize the attachment and separation of the workpiece positioning disc 160 and the box body workpiece.

[0045] In the embodiment, the device further comprises a second driving mechanism 180 for driving the rotation of the rotating disc 10, the rotating disc 10 is in transmission connection with the output shaft of the second driving mechanism 180 through a hollow rotating shaft, a channel penetrating through both ends of the hollow rotating shaft is arranged in the hollow rotating shaft, which can improve the rigidity of the driving rotating shaft, and also facilitates the air cylinder on the rotating disc 10 to pass through the channel, thereby realizing continuous air supply for the air cylinder; wherein the first driving mechanism and the second driving mechanism 180 are both electric motors, and in order to ensure the stability of the output torque, a corresponding speed changer 181 is further connected to the output end of the second driving mechanism 180; wherein the first driving mechanism and the second driving mechanism are both arranged on the rear side wall of the base mounting plate, and a window for connecting the second engaging member with the first engaging member is arranged on the upper end of the base mounting plate opposite to the printing position.

[0046] In the embodiment, the device further comprises an upper feeding mechanism 190 and a lower feeding mechanism 200 arranged on the upper feeding position and the lower feeding position respectively, specifically, the upper feeding mechanism 190 and the lower feeding mechanism 200 both comprise a conveying belt 1a arranged in the left-right direction, and a suction cup module 1b arranged above the front side of the conveying belt 1a and movable forward and backward; specifically, the suction cup module 1b comprises a suction cup body 1b1 for adsorbing the front end face of the box body workpiece, and a linear driving unit 1b2 for driving the suction cup body 1b1 to move forward and backward; the linear driving unit 1b2 can adopt a commonly used module such as a cylinder or a lead screw motor or a linear motor, when feeding or discharging is needed, the suction cup body 1b1 is driven by the linear driving unit 1b2 to be adsorbed and fixed with the box body workpiece, thereby facilitating the box body workpiece to be sleeved on the movable block 3a or taken off from the movable block 3a.

[0047] Further, the upper feeding mechanism 190 further comprises a transfer table 191 arranged between the conveying belt 1a and the suction cup module 1b, and a material moving manipulator 192 for moving the box body workpiece to the transfer table 191; when the rotating disc 10 is rotated to the position, the movable block 3a is aligned with the rear end of the transfer table 191, at this time the material moving manipulator 192 moves the box body workpiece from the conveying belt 1a to the transfer table 191 in advance, at this time the front end face of the box body workpiece is adsorbed by the suction cup module 1b and is sleeved on the movable block 3a, after being positioned, the suction cup module 1b is reset, and then the rotating disc 10 is started to move the box body workpiece on the movable block 3a to the printing position.

[0048] In addition, in order to ensure the stability of the printing quality, a hot air gun 210 for blowing hot air to the box body workpiece is further arranged above the transfer table 191 on the supporting frame 140, the surface of the box body workpiece is heated by the hot air gun 210, so as to improve the adhesion of the printed pattern to the surface of the box body workpiece; further, a wind collecting hood 220 is arranged on the base mounting plate 20, the inlet of the wind collecting hood 220 is in a horn shape and opposite to the hot air gun 210, and the gap between the two can be used for the positioning mechanism 30 and the box body workpiece to rotate through.

[0049] It is to be understood that all such modifications and variations that can occur to those skilled in the art in the light of the foregoing description are to be considered within the scope of the application as defined in the claims appended hereto.

Claims

1. A surface thermal printing apparatus, characterized in that, The device includes a vertically rotatable turntable. The top of the front side of the turntable is provided with a printing position, and the left and right ends are respectively provided with a loading position and a unloading position. Multiple workpiece fixing positions are arranged circumferentially from the loading position to the unloading position in a clockwise direction on the turntable. Each workpiece fixing position is provided with a positioning mechanism that extends into the inside of the workpiece to fix it. The positioning mechanism has multiple circumferentially arranged movable blocks that can reciprocate and move in a centripetal motion. In the positioning state, the annular structure composed of multiple movable blocks expands outward and abuts against the inner wall of the workpiece. The positioning mechanism includes a positioning shaft arranged in the front-back direction and rotatably connected to the turntable, and a positioning seat located at the front end of the positioning shaft; the positioning seat is provided with a movable block that can reciprocate along the radial direction of the positioning shaft, and the positioning mechanism further includes an expansion module that drives the movable block to reciprocate. The positioning shaft has an axially extending through-hole at both ends, and the positioning seat has an inner cavity communicating with the axially extending through-hole; the expansion module includes a movable rod axially movably disposed in the axially extending through-hole and with its front end extending into the inner cavity, and a reciprocating drive assembly for driving the movable rod to reciprocate axially; the front end of the movable rod is hinged to a connecting arm, and the end of the connecting arm opposite to the movable rod is hinged to the movable block; The reciprocating drive assembly includes a ring coaxially movably sleeved on the positioning shaft, a connecting rod connecting the ring and the movable rod, and a positioning drive unit that drives the ring to reciprocate axially; the positioning shaft is provided with a clearance hole for the connecting rod to move, the outer peripheral sidewall of the ring is coaxially provided with an annular groove, and the movable terminal of the positioning drive unit is provided with a push rod extending into the annular groove.

2. The surface thermal printing equipment according to claim 1, characterized in that, The device also includes a hot stamping printing module located above the turntable for printing on the box workpiece fixed on the positioning mechanism, a first drive mechanism located on the top of the rear side of the turntable for driving the positioning mechanism to achieve fixed-axis rotation, and a clutch-type transmission mechanism that operates when the box workpiece moves to the printing position and drives the first drive mechanism and the positioning mechanism.

3. The surface thermal printing equipment according to claim 2, characterized in that, The clutch-type transmission mechanism includes a first engagement member located at the rear end of the positioning shaft, a second engagement member that can be separated from or connected to the first engagement member, and a separation drive module that drives the second engagement member to connect or separate from the first engagement member. The second fitting is disposed on the rotating shaft of the first driving mechanism, and the first driving mechanism is disposed on the movable terminal of the separation driving module.

4. The surface thermal printing equipment according to claim 1, characterized in that, The device also includes a support frame located on the front side of the turntable, a workpiece positioning rod located on the support frame in the front-rear direction, and a workpiece positioning plate vertically fixed to the rear end of the workpiece positioning rod; the workpiece positioning rod is longitudinally rotatably connected to the support frame, and in the positioning state, the rear side wall of the workpiece positioning plate abuts coaxially with the front end of the workpiece in the box.

5. The surface thermal printing equipment according to claim 1, characterized in that, The device also includes a second drive mechanism that drives the turntable to rotate. The turntable is connected to the output shaft of the second drive mechanism via a drive shaft, and the drive shaft has a channel passing through both ends of it.

6. The surface thermal printing equipment according to claim 1, characterized in that, The equipment also includes a feeding mechanism and a discharging mechanism respectively disposed on the feeding position and the discharging position.

7. The surface thermal printing equipment according to claim 6, characterized in that, Both the loading mechanism and the unloading mechanism include a conveyor belt arranged in the left-right direction and a suction cup module located above the front side of the conveyor belt and movable back and forth; the loading mechanism also includes a transfer platform located between the conveyor belt and the suction cup module, and a transfer robot that moves the box workpiece onto the transfer platform.

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