Automatic switching mechanism of powder storage bottle of UV printing powder spraying device

Abstract

The application provides a powder storage bottle automatic switching mechanism of a UV printing powder spraying device, and belongs to the technical field of UV printing powder spraying auxiliary devices. The powder storage bottle automatic switching mechanism comprises a powder spraying device main body, a connecting seat, and a distribution turntable. The top of the powder spraying device main body is provided with a feeding port. The connecting seat is fixedly arranged on the powder spraying device main body. The distribution turntable is rotatably arranged above the connecting seat. The powder storage bottle automatic switching mechanism of the UV printing powder spraying device is coaxially fixed on the distribution turntable through a hole ring-shaped piece and rotates synchronously. Each through hole is in one-to-one correspondence with the powder outlet of the powder storage bottle and is inserted and matched. The opening and closing of the partition piece independently controls the on-off of the powder falling channel. The detection device monitors the powder amount in real time and automatically triggers the rotation of the distribution turntable by one station when the powder amount is lower than the threshold value. The problems of powder leakage caused by the coupling of the switching action and the on-off of the powder in the existing technology are solved. The automatic switching and continuous powder supply of the powder storage bottle are realized. The switching process does not require manual intervention, and the equipment can continuously run in an unattended state.

Description

Technical Field

[0001] This application provides an automatic switching mechanism for the toner storage bottle of a UV printing toner spraying device, belonging to the technical field of UV printing toner spraying auxiliary devices. Background Technology

[0002] V-jet printing combined with powder curing technology is now widely used in acrylic cultural and creative products, customized mobile phone cases, badge and medal processing, and other fields. In existing technologies, the powder storage bottle on the powder spraying device is detachably connected to the main body via a clamping component, and the powder storage bottle is replaced manually. When a bottle of powder is used up, the operator needs to stop the machine, remove the empty bottle, and refill it. The whole process is time-consuming and affects the continuous operation capability of the equipment.

[0003] Several improved solutions have been developed. For example, patent CN216274330U discloses a supersonic flame spraying powder feeding device, including a base plate, multiple support rods fixed to the top surface of the base plate, a fixing ring fixed to the top of the support rods, an annular groove on the inner side of the fixing ring, an annular convex edge rotatably connected in the annular groove, a turntable fixed to the inner side of the annular convex edge, four grooves on the top surface of the turntable, and the bottom end of a powder storage tank inserted into each of the four grooves, with a through hole at the center of the groove. This solution allows for the replacement of different powder storage tanks and connecting them to the feed hopper at any time by rotating the turntable, eliminating the need to disassemble the powder storage tanks when changing powder. Furthermore, patent CN108790400A relates to a device for changing powder types when supplying powder to a printing press spraying device, including a first memory for a first powder type, a second memory for a second powder type, and a piping system, with optional connecting devices controlled by an electronic control device to achieve powder type switching.

[0004] However, the above solutions still have shortcomings. In CN216274330U, the powder storage tank is directly inserted into the rotary table groove. The powder supply and demand rely on the insertion and removal action between the outlet and the connection port—insertion connects the circuit, and removal disconnects it. There is a coupling between the switching action and the powder supply and demand, making it impossible to achieve the timing control of "switching to the correct position first, then opening the circuit." Furthermore, there is a lack of a precise locking mechanism for the rotary table's rotation position during the switching process. CN108790400A relies on a complex piping system and valve switching, resulting in a relatively complex structure and low integration. Neither solution involves automated switching control logic based on real-time monitoring of powder balance. Even after the powder storage tank is depleted, manual judgment and operation are still required, making unattended continuous powder supply impossible. Summary of the Invention

[0005] In view of the deficiencies of the existing technology, this application provides an automatic switching mechanism for the powder storage bottle of a UV printing powder spraying device, which can effectively solve the related technical problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: This application discloses an automatic switching mechanism for the powder storage bottle of a UV printing powder spraying device, including a powder spraying device body with a feed port on the top; and a connecting seat fixedly mounted on the powder spraying device body. A turntable is rotatably mounted above the connecting seat; A drive motor, mounted on the connecting base, is connected to the rotary table via a transmission component and is used to drive the rotary table to rotate. Multiple clamping components are fixedly disposed on the top surface of the rotary table along the circumference, and each clamping component is used to clamp and fix a powder storage bottle. A perforated annular plate is coaxially fixed on the rotary table. Multiple through holes are provided on the perforated annular plate along the circumference. Each through hole corresponds to the position of each clamping component, and each through hole is adapted to be inserted into the powder outlet of the corresponding powder storage bottle. An opening and closing communication component includes an upper communication plate, a lower communication plate, and an opening and closing partition. The upper communication plate is fixedly disposed below the perforated annular plate and communicates with the through hole of the perforated annular plate. The lower communication plate is fixedly disposed below the upper communication plate and communicates with the upper communication plate. The opening and closing partition is movably inserted between the upper communication plate and the lower communication plate to control the opening and closing of the powder passage. The device includes a detection device, which is installed on the main body of the powder spraying device to monitor the remaining amount of powder. The drive motor and the detection device are both electrically connected to the control system of the main body (1) of the powder spraying device. When the detection device detects that the remaining amount of powder is lower than a preset threshold, the control system controls the drive motor to drive the rotary table to rotate one station and switch the next powder storage bottle to the top of the feed inlet.

[0007] In summary, the technical solution provided in this application has at least one of the following advantages compared with the prior art: The automatic powder bottle switching mechanism of this UV printing powder spraying device uses a perforated annular plate coaxially fixed on a rotary table to rotate synchronously with it. Each through hole is inserted and connected to the powder outlet of the powder bottle. With the help of opening and closing partitions, the powder dispensing channel is independently controlled. The detection device monitors the remaining powder in real time and automatically triggers the rotary table to rotate one station when it is below the threshold. This solves the problems of manual powder bottle replacement requiring machine shutdown and powder leakage caused by the coupling of switching action and powder on / off in the existing technology. It realizes automated switching of powder bottles and continuous powder supply. The switching process does not require manual intervention, and the equipment can operate continuously in an unattended state.

[0008] Meanwhile, the perforated annular plate integrates the fixing, positioning and sealing functions of the powder storage bottle into a single annular plate. Compared with the existing technology where the powder storage tank is directly inserted into the turntable groove, the insertion and matching between each through hole and the powder outlet of the powder storage bottle not only ensures that each powder storage bottle can be accurately aligned with the powder drop channel during the switching process, but also achieves self-sealing through the sealing effect of the inner wall of the through hole on the powder outlet of the powder storage bottle in the non-working position, saving the cost of setting a valve on each powder storage bottle separately. The opening and closing connection component adopts a three-layer structure consisting of an upper connecting plate, a lower connecting plate, and an opening and closing partition. The opening and closing partition independently controls the opening and closing of the powder discharge channel, thus decoupling the rotation of the rotary disc from the powder on / off action. Compared with the existing technology that relies on plugging and unplugging the discharge port and connecting plug to achieve on / off, this method can close the powder discharge channel before the rotary disc rotates and open it after it has rotated to the correct position, avoiding powder leakage caused by misalignment between the discharge port and the powder discharge channel during the switching process. Meanwhile, the positioning component uses a magnetic positioning block and an electromagnet to achieve precise positioning. The magnetic positioning block is fixed circumferentially to the bottom of the perforated annular plate and corresponds one-to-one with the position of each through hole. The electromagnet is fixed to the top of the powder spraying device and corresponds to the position of the feed inlet. The linkage between the positioning and the through hole positions ensures that each powder storage bottle can be accurately aligned when switched to the top of the feed inlet. After being attracted, it also locks the rotary table to prevent it from shifting due to vibration during powder supply. The notched ring of the receiving component is located between the opening and closing connecting component and the main feed inlet of the powder spraying device. The annular groove receives the powder falling from the powder drop channel, preventing the powder from scattering and contaminating the machine. The detachable connection structure formed by the T-shaped groove plate and the T-shaped tenon can be assembled and disassembled without tools, which is convenient for operators to clean and maintain regularly, and prevents the powder from accumulating in the annular groove for a long time and becoming damp and clumping. The detection device, in conjunction with the control system, completes the rotation switching of the toner dispenser during printing intervals. The control system first shuts off the toner delivery channel, then drives the toner dispenser to rotate, and reopens the toner delivery channel after positioning is complete. The entire switching process is completed during the brief pause when the print head or scanner reverses direction, without occupying additional production time. The switching action is completely transparent to ongoing printing jobs. This solution differs from the existing "use-up-and-switch" approach; it proactively senses and switches in advance. Attached Figure Description

[0009] Figure 1 This is a front-view stereoscopic structural diagram of this application; Figure 2 This is a three-dimensional structural diagram of the automatic switching mechanism and the main body of the powder spraying device in this application, in a separated state. Figure 3 This is a bottom-view perspective view of the structure of this application; Figure 4This is a partial three-dimensional structural view of the relevant components at the clamping part in this application; Figure 5 This is a partially exploded three-dimensional structural view of the relevant components at the opening and closing connection assembly in this application; Figure 6 For this application Figure 1 A magnified view of the structure at point A in the middle; Figure 7 This is a partial three-dimensional structural diagram of the relevant components at the junction of the components in this application; Figure 8 This is a partially exploded three-dimensional structural diagram of the bonding component in this application; Figure 9 This is a partial three-dimensional structural diagram of the relevant components at the drive assembly in this application; Figure 10 This is a three-dimensional structural diagram of the motion state of the driving component in this application.

[0010] The labels in the diagram represent: 1. Main body of the powder spraying device; 11. Powder storage bottle; 2. Automatic switching mechanism; 21. Rotating assembly; 211. Connecting base; 212. Drive motor; 213. Transmission component; 214. Dividing turntable; 22. Clamping component; 221. Support bar; 222. Clamping part; 23. Opening and closing connecting component; 231. Annular plate with hole; 232. Upper connecting plate; 233. Lower connecting plate; 234. Opening and closing partition; 3. Positioning component; 31. Magnetic positioning block; 32. Electromagnet; 4. Receiving assembly; 41. Notched ring; 42. T-slot plate; 43. T-shaped tenon; 5. Drive components; 51. Pneumatic cylinder; 52. Connecting parts. Detailed Implementation

[0011] The present application will be further described below with reference to embodiments.

[0012] As a first embodiment of this application: Reference Appendix Figures 1 to 10 As shown, an automatic switching mechanism for the powder storage bottle of a UV printing powder spraying device includes a powder spraying device body 1, a connecting seat 211, a rotary table 214, a drive motor 212, a transmission component 213, a clamping component 22, a perforated annular plate 231, an opening and closing communication component 23, a detection device, a positioning component 3, a receiving component 4, and a drive component 5. The main body 1 of the powder spraying device serves as the mounting base for the entire mechanism, and a feed inlet is provided on its top. This feed inlet is connected to the powder transition chamber inside the main body 1 of the powder spraying device. At the same time, a powder-attaching roller is provided inside the main body 1 of the powder spraying device and at the bottom of the powder transition chamber. One end of the powder-attaching roller is connected to a drive motor. After the powder falls into the powder transition chamber through the feed inlet, the drive motor drives the powder-attaching roller to rotate, so that the powder is discharged and enters the subsequent mixing and spraying process.

[0013] The connecting seat 211 is fixedly mounted on the main body 1 of the powder spraying device, serving as a supporting base for the rotating component. The bottom surface of the connecting seat 211 is fixedly connected to the top surface of the main body 1 of the powder spraying device by bolts or screws. The top surface of the connecting seat 211 is provided with a bearing seat or shaft mounting hole for mounting the rotary table 214.

[0014] The dividing turntable 214 is rotatably mounted above the connecting base 211. The drive motor 212 is mounted on the connecting base 211 and is connected to the dividing turntable 214 through the transmission component 213 to drive the dividing turntable 214 to rotate.

[0015] Multiple clamping components 22 are fixedly disposed circumferentially on the top surface of the rotary table 214, and each clamping component 22 is used to clamp and fix one powder storage bottle 11. In this embodiment, there are five clamping components 22, which are evenly distributed along the top surface of the rotary table 214, with an included angle of 72° between adjacent clamping components. The specific number of clamping components 22 can be adjusted according to the actual production requirements for continuous powder supply time—the more components, the longer the equipment can run continuously after a single filling. The installation position of each clamping component 22 on the rotary table 214 maintains a precise one-to-one correspondence with each through hole on the perforated annular plate 231 in the circumferential direction, ensuring that after the powder outlet of each powder storage bottle 11 is inserted into the corresponding through hole, the bottle can be stably clamped from the side by the clamping component 22.

[0016] An annular plate 231 with perforations is coaxially fixed on the rotary table 214. Multiple through holes are circumferentially formed on the annular plate 231, each corresponding to a clamping component 22, and each through hole is fitted into the powder outlet of the corresponding powder storage bottle 11. The powder storage bottle 11 is installed upside down with its opening facing downwards, and its powder outlet is inserted into the through hole of the annular plate 231. The outer wall of the powder outlet and the inner wall of the through hole are in a clearance fit, designed to ensure smooth insertion and removal of the powder storage bottle 11, while preventing powder leakage from the gap between the powder outlet and the through hole under gravity. The coaxial fixed connection between the annular plate 231 and the rotary table 214 ensures that the annular plate 231 rotates synchronously with the rotary table 214, with no relative rotation between them. This guarantees that the relative positions of each through hole and each clamping component 22 remain constant during equipment operation.

[0017] The opening and closing connecting component 23 includes an upper connecting plate 232, a lower connecting plate 233, and an opening and closing partition 234. The upper connecting plate 232 is fixedly disposed below the perforated annular plate 231 and communicates with the through holes of the perforated annular plate 231. The lower connecting plate 233 is fixedly disposed below the upper connecting plate 232 and communicates with the upper connecting plate 232. The upper connecting plate 232 and the lower connecting plate 233 are connected by circular holes formed inside both of them. Each through hole of the perforated annular plate 231 forms a powder falling channel through the circular holes inside the upper connecting plate 232 and the lower connecting plate 233. The opening and closing partition 234 is movably inserted between the upper connecting plate 232 and the lower connecting plate 233 to control the opening and closing of the powder passage. Specifically, the opening and closing partition 234 is a flat plate component with through holes on it corresponding to the size and position of the circular holes inside the upper connecting plate 232 and the lower connecting plate 233. The opening / closing partition 234 is inserted horizontally between the upper connecting plate 232 and the lower connecting plate 233. When the opening / closing partition 234 slides to the first position, the through hole on the opening / closing partition 234 is misaligned with the circular holes of the upper connecting plate 232 and the lower connecting plate 233, and the powder falling channel is blocked. When the opening / closing partition 234 slides to the second position, the three are aligned, and the powder falling channel is opened. The sliding direction of the opening / closing partition 234 is perpendicular to the rotation axis of the rotary table 214.

[0018] The translational stroke of the opening / closing partition 234 is controlled by a limiting structure located at one end. When the partition 234 reaches the end of its stroke, its through hole is perfectly aligned with the circular holes of the upper connecting plate 232 and the lower connecting plate 233, ensuring that the cross-sectional area of ​​the powder falling channel is not obstructed in the conductive state. In this embodiment, the opening / closing partition 234 is pneumatically driven, and its specific structure will be described later in conjunction with the driving component 5.

[0019] The positioning component 3 includes multiple magnetic positioning blocks 31 and an electromagnet 32. The multiple magnetic positioning blocks 31 are fixedly arranged circumferentially at the bottom of the perforated annular plate 231 and correspond one-to-one with the position of each through hole. The electromagnet 32 ​​is fixedly arranged at the top of the powder spraying device body 1 and corresponds to the position of the feed inlet. When each magnetic positioning block 31 rotates with the perforated annular plate 231 and engages with the electromagnet 32, the powder storage bottle 11 corresponding to that magnetic positioning block 31 aligns with the feed inlet. The engagement between the magnetic positioning block 31 and the electromagnet 32 ​​is a surface contact engagement—the bottom surface of the magnetic positioning block 31 is a plane, and the top surface of the electromagnet 32 ​​is a plane; when they engage, the planes are in contact, resulting in high positioning accuracy and good repeatability. The number of magnetic positioning blocks 31 is the same as the number of clamping components 22, both being five, evenly distributed circumferentially along the bottom of the perforated annular plate 231. The included angle between adjacent magnetic positioning blocks 31 is the same as the included angle between adjacent clamping components 22, both being 72°.

[0020] The receiving component 4 is located below the opening and closing connecting component 23 and is used to receive the powder falling from the opening and closing connecting component 23 and guide it to the feed inlet. The receiving component 4 includes a notched ring 41, which is located directly below the opening and closing connecting component 23. The notched ring 41 has a notch corresponding to the feed inlet position of the powder spraying device body 1. The top surface of the notched ring 41 has an annular groove for receiving the powder falling from the bottom of the opening and closing connecting component 23.

[0021] The receiving assembly 4 is connected to the connecting seat 211 via a detachable structure. The detachable structure includes a T-shaped groove plate 42 and a T-shaped tenon 43. The T-shaped groove plate 42 is fixedly mounted on the connecting seat 211 and has a T-shaped groove inside. The T-shaped tenon 43 is fixedly mounted on the bottom of the notched ring 41 and engages with the T-shaped groove. The T-shaped groove extends horizontally. After the T-shaped tenon 43 is inserted from one end of the T-shaped groove, it slides horizontally to the locking position, thus completing the fixed connection between the notched ring 41 and the connecting seat 211. For disassembly, the T-shaped tenon 43 is slid in the opposite direction until it disengages from the T-shaped groove. This detachable structure allows for tool-free assembly and disassembly of the receiving assembly 4, facilitating regular cleaning and maintenance by operators and preventing powder from accumulating in the annular groove and becoming damp and clumpy.

[0022] The drive assembly 5 includes a pneumatic cylinder 51 and a connecting member 52. The pneumatic cylinder 51 is fixedly mounted on the main body 1 of the powder spraying device. The connecting member 52 connects the piston rod of the pneumatic cylinder 51 to the opening and closing partition 234, and is used to drive the opening and closing partition 234 to translate to open or close the powder falling channel. The pneumatic cylinder 51 is a double-acting cylinder, and the extension and retraction of its piston rod correspond to the opening and closing actions of the opening and closing partition 234, respectively. The air intake and exhaust of the pneumatic cylinder 51 are controlled by the control system of the powder spraying device through a solenoid valve. When it is necessary to open the powder falling channel, the control system sends a signal to the solenoid valve, causing compressed air to enter the rodless chamber of the pneumatic cylinder 51, pushing the piston rod to extend and causing the opening and closing partition 234 to translate to the open position. When it is necessary to close the powder falling channel, the control system switches the solenoid valve, causing compressed air to enter the rod chamber of the pneumatic cylinder 51, pushing the piston rod to retract and causing the opening and closing partition 234 to translate to the closed position.

[0023] A detection device is mounted on the main body 1 of the powder spraying device to monitor the remaining powder level. Both the drive motor 212 and the detection device are electrically connected to the control system of the main body 1. When the detection device detects that the remaining powder level is below a preset threshold, the control system controls the drive motor 212 to rotate the rotary table 214 one position, switching the next powder storage bottle 11 above the inlet. The detection device is either a capacitive sensor or a photoelectric sensor—a capacitive sensor determines the powder level by detecting the capacitance change between the powder and the sensor probe, suitable for powders of various colors; a photoelectric sensor determines the powder level by detecting whether the powder is blocking the light path, which is less expensive but requires the powder storage bottle or powder path to be transparent. Those skilled in the art can select the appropriate sensor type based on the characteristics of the powder actually used.

[0024] As a second embodiment of this application: The difference between this embodiment and the first embodiment lies in the specific structure of the clamping component 22. In this embodiment, the clamping component 22 includes a support bar 221 and a clamping part 222. The support bar 221 is vertically fixed to the top surface of the rotary table 214, and the clamping part 222 is disposed on the top of the support bar 221. The clamping part 222 is an arc-shaped elastic clamping structure used to clamp and fix the body of the powder storage bottle 11 from the side. The bottom end of the support bar 221 is fixed to the top surface of the rotary table 214 by welding or threaded fasteners, and the extension direction of the support bar 221 is perpendicular to the top surface of the rotary table 214. The clamping part 222 consists of two symmetrically arranged arc-shaped elastic clamps, and the distance between the two arc-shaped elastic clamps is slightly smaller than the outer diameter of the body of the powder storage bottle 11. The powder storage bottle 11 is inserted upside down into the clamping space formed by the support bar 221 and the clamping part 222. When the bottle body is inserted, the two arc-shaped elastic clamps are stretched open and elastically deformed. The restoring force generated by the deformation clamps the bottle body from both sides. The inner surface of the arc-shaped elastic clip can be provided with anti-slip texture or lined with a rubber pad to increase the friction between it and the bottle body, and prevent the powder storage bottle 11 from moving axially or rotating circumferentially due to vibration during the high-speed movement of the powder spraying device with the printing head.

[0025] As a third embodiment of this application: The difference between this embodiment and the first or second embodiment lies in that the clamping component 22 is a clamp structure. The clamp structure is a two-part clamp with a rubber pad on the inner side, which is tightened by screws or quick-locking clips to clamp and fix the powder storage bottle 11 to the top surface of the turntable 214. The two halves of the clamp structure are connected on one side by a hinge and on the other side by screws or quick-locking clips, facilitating the quick insertion and removal of the powder storage bottle 11. Compared with the arc-shaped elastic clip structure in the second embodiment, the clamp structure has a larger and more uniform clamping force, making it suitable for powder storage bottles 11 that are heavier or have a larger body, but the assembly and disassembly speed is slightly slower than that of the elastic clip structure. Those skilled in the art can choose a suitable clamping method according to the size and weight of the powder storage bottle 11.

[0026] As a fourth embodiment of this application: The difference between this embodiment and any of the aforementioned embodiments is that the transmission component 213 is a pulley drive structure or a gear drive structure; the drive motor 212 is a stepper motor or a servo motor. When a pulley drive structure is used, the output end of the drive motor 212 is provided with a driving pulley, and the shaft of the turntable 214 is provided with a driven pulley. The driving pulley and the driven pulley are connected by a synchronous belt. Synchronous belt drive can ensure that the transmission ratio between the drive motor 212 and the turntable 214 is precise and constant, and has the advantages of smooth transmission, low noise, and shock absorption. When a gear drive structure is used, the output end of the drive motor 212 is provided with a driving gear, and the shaft of the turntable 214 is provided with a driven gear. The driving gear and the driven gear mesh. Gear drive has the advantages of precise transmission ratio, compact structure, and high load-bearing capacity, but the noise and vibration during gear meshing are slightly greater than those of belt drive. Stepper motors are suitable for applications where cost is a primary concern and positioning accuracy requirements are not particularly high. Their open-loop control method achieves precise angular displacement control without the need for an encoder. Servo motors, on the other hand, are suitable for applications requiring high positioning accuracy and response speed. Their closed-loop control method provides real-time feedback of rotor position and error compensation, resulting in higher positioning accuracy. Those skilled in the art can select the appropriate motor type based on actual accuracy requirements and cost budget.

[0027] As the fifth embodiment of this application: The difference between this embodiment and any of the aforementioned embodiments is that the detection device is a capacitive sensor or a photoelectric sensor. When the detection device detects that the remaining powder level is lower than a preset threshold, the control system controls the drive motor 212 to drive the rotary table 214 to rotate one station during the interval between printing tasks, completing the automatic switching of the powder storage bottle. Specifically, the control system issues a switching command during the short pause when the print head changes direction or the scanning direction changes, so that the rotation of the rotary table 214 does not occupy additional production time. "The interval between printing tasks" refers to the short pause when the print head changes direction after completing one scan, or the interval between printing one layer and entering the next layer. During this period, the powder spraying device stops spraying powder, the opening and closing partition 234 is in the off position, and the rotation of the rotary table 214 will not affect the ongoing printing operation. Before issuing the switching command, the control system first sends a signal to the pneumatic cylinder 51 to drive the opening and closing partition 234 to move to the off position. After confirming that the powder drop channel is completely closed, it then issues a rotation command to the drive motor 212. After the switching is completed, the control system waits for the magnetic positioning block 31 and the electromagnet 32 ​​to engage in place and confirms that the positioning is complete before sending a signal to the pneumatic cylinder 51 to drive the opening and closing partition 234 to move to the conducting position and restore the powder supply. This "turn off first, then switch, then turn on" control logic ensures that there is no powder spillage or leakage during the switching process and guarantees the consistency of the powder spraying amount before and after the switching.

[0028] In addition, it is worth noting that after the automatic switching of the powder storage bottle is completed, the detection device synchronously sends a signal to the control system on the main body 1 of the powder spraying device, so that the main body 1 of the powder spraying device can spray powder to discharge the residual powder. Specifically, in order to clear and discharge the residual powder inside the main body 1 of the powder spraying device, the control system on the main body 1 of the powder spraying device drives the drive motor on the main body 1 of the powder spraying device to drive the powder roller to rotate at high speed, quickly emptying the residual powder inside the main body 1 of the powder spraying device, and avoiding powder mixing and contamination caused by switching different powders. Furthermore, an external negative pressure dust collection device can be used to suction the powder from the inside of the powder spraying device body 1; the negative pressure dust collection device can be an industrial vacuum cleaner.

[0029] As the sixth embodiment of this application: The difference between this embodiment and any of the previous embodiments lies in the working logic of the positioning component 3. The positioning component 3 includes multiple magnetic positioning blocks 31 and an electromagnet 32. The multiple magnetic positioning blocks 31 are fixedly disposed circumferentially at the bottom of the perforated annular plate 231 and correspond one-to-one with the position of each through hole. The electromagnet 32 ​​is fixedly disposed at the top of the powder spraying device body 1 and corresponds to the position of the feed inlet. When each magnetic positioning block 31 rotates with the perforated annular plate 231 to the point of engaging with the electromagnet 32, the powder storage bottle 11 corresponding to that magnetic positioning block 31 is aligned with the feed inlet.

[0030] The magnetic positioning block 31 can be a permanent magnet or a magnetically conductive metal block. When the magnetic positioning block 31 is a permanent magnet, the electromagnetic force generated by the electromagnet 32 ​​after it is energized attracts the permanent magnet. When the magnetic positioning block 31 is a magnetically conductive metal block, the electromagnetic force generated by the electromagnet 32 ​​after it is energized attracts the magnetically conductive metal block. Both methods can achieve precise positioning. The difference is that the permanent magnet method still has a certain holding force after the electromagnet 32 ​​is de-energized, while the magnetically conductive metal block method has zero holding force after the electromagnet 32 ​​is de-energized, making it easier for the subsequent rotation of the turntable 214. Those skilled in the art can choose the appropriate implementation method according to actual needs.

[0031] When the rotary disc 214 rotates, the perforated annular plate 231 rotates synchronously with it. Each magnetic positioning block 31, fixed to the bottom of the perforated annular plate 231, passes above the electromagnet 32 ​​in sequence. When a magnetic positioning block 31 rotates directly above the electromagnet 32, the control system energizes the electromagnet 32, which generates electromagnetic force to attract the magnetic positioning block 31. Since the magnetic positioning blocks 31 correspond one-to-one with the positions of the through holes on the perforated annular plate 231, and the positions of the through holes correspond one-to-one with the positions of the clamping components 22, when the magnetic positioning block 31 is attracted by the electromagnet 32, the powder storage bottle 11 corresponding to that magnetic positioning block 31 is precisely aligned with the feed inlet. The attraction action of the electromagnet 32 ​​serves two purposes: first, it locks the rotary disc 214 in its current position, preventing it from shifting due to vibration or external force during powder spraying; second, it sends a signal to the control system indicating that the powder storage bottle 11 is accurately positioned and the powder feeding channel can be opened to begin powder supply.

[0032] When switching to the next powder storage bottle 11 is required, the control system first de-energizes the electromagnet 32. After losing its electromagnetic force, the electromagnet 32 ​​releases the magnetic positioning block 31, and the rotary table 214 returns to a rotatable state. Subsequently, the drive motor 212 starts, driving the rotary table 214 to rotate to the next station, repeating the positioning process. The electromagnet 32 ​​has a fast engagement and disengagement response speed, completing positioning and disengagement actions within milliseconds. Combined with precise angular displacement control by a stepper motor or servo motor, this ensures the positioning accuracy and consistency of the rotary table 214 after each rotation to a new station.

[0033] The complete working principle and process of this device are as follows: In the initial state, multiple powder storage bottles 11 are filled with powder of the same or different colors / materials, and are fixed to the top surface of the rotary table 214 by the clamping component 22. The powder outlet of each powder storage bottle 11 is inserted into the through hole of the perforated annular plate 231. The opening and closing partition 234 is in the closed position, blocking the powder passage.

[0034] When it is necessary to switch powder storage bottles, the control system sends a command to the drive motor 212. The drive motor 212 drives the distribution disc 214 to rotate through the transmission component 213. When the distribution disc 214 rotates, the perforated annular plate 231 rotates synchronously with the distribution disc 214, and each powder storage bottle 11 rotates together with the distribution disc 214.

[0035] When the target powder storage bottle 11 rotates with the rotary table 214 to above the feed inlet, the magnetic positioning block 31 fixed to the bottom of the perforated annular plate 231 engages with the electromagnet 32 ​​fixed to the top of the powder spraying device body 1, achieving precise positioning and ensuring that the powder outlet of the target powder storage bottle 11, the through hole of the perforated annular plate 231, the round holes inside the upper connecting plate 232 and the lower connecting plate 233, and the feed inlet are aligned vertically.

[0036] After positioning, the pneumatic cylinder 51 drives the opening and closing partition 234 to move horizontally through the connector 52, so that the hole on the opening and closing partition 234 aligns with the round holes inside the upper connecting plate 232 and the lower connecting plate 233, and the powder falling channel opens. Under the action of gravity, the powder in the powder storage bottle 11 passes through the through hole of the perforated annular plate 231, the round holes inside the upper connecting plate 232 and the lower connecting plate 233, and the hole of the opening and closing partition 234 in sequence, falling into the annular groove of the notched ring body 41 of the receiving component 4, and then is guided through the notch on the notched ring body 41 to the feed port of the powder spraying device body 1, and enters the inside of the powder spraying device.

[0037] When the detection device detects that the remaining powder in the powder storage bottle 11 is lower than the preset threshold, the control system sends a switching signal. The pneumatic cylinder 51 drives the opening and closing partition 234 to move to the off position, closing the powder feeding channel. Then the drive motor 212 starts again, driving the rotary table 214 to rotate one station, switching the next powder storage bottle 11 above the feed inlet, and repeating the above steps of positioning, opening the passage, and feeding powder.

[0038] During the switching process, since the opening and closing partition 234 is closed before the rotary table 214 rotates, and the through holes of the perforated annular plate 231 are only connected to the powder discharge channel when aligned with the feed inlet, the powder outlet of the powder storage bottle 11 in the non-working position is always blocked by the inner wall of the through holes of the perforated annular plate 231, and no powder leakage will occur. The above process is repeated until all the powder in the powder storage bottles 11 is consumed, or the operator manually stops the powder supply.

[0039] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An automatic toner bottle switching mechanism for a UV printing toner spraying device, comprising: The main body of the powder spraying device (1) has a feed inlet at its top; Its features are, The connecting seat (211) is fixedly installed on the main body (1) of the powder spraying device; The turntable (214) is rotatably positioned above the connecting seat (211); A drive motor (212) is mounted on the connecting seat (211) and is connected to the sub-disc (214) via a transmission component (213) to drive the sub-disc (214) to rotate. There are multiple clamping components (22), which are fixedly disposed on the top surface of the rotary table (214) along the circumference. Each clamping component (22) is used to clamp and fix a powder storage bottle (11). A perforated annular plate (231) is coaxially fixed on the rotary table (214). Multiple through holes are provided on the perforated annular plate (231) along the circumferential direction. Each through hole corresponds to the position of each clamping component (22), and each through hole is adapted to be inserted into the powder outlet of the corresponding powder storage bottle (11). The opening and closing communication component (23) includes an upper communication plate (232), a lower communication plate (233), and an opening and closing partition (234). The upper communication plate (232) is fixedly disposed below the perforated annular plate (231) and communicates with the through hole of the perforated annular plate (231). The lower communication plate (233) is fixedly disposed below the upper communication plate (232) and communicates with the upper communication plate (232). The opening and closing partition (234) is movably inserted between the upper communication plate (232) and the lower communication plate (233) to control the opening and closing of the powder passage. The detection device is installed on the main body (1) of the powder spraying device to monitor the remaining amount of powder. The drive motor (212) and the detection device are both electrically connected to the control system of the main body (1) of the powder spraying device. When the detection device detects that the remaining amount of powder is lower than the preset threshold, the control system controls the drive motor (212) to drive the rotary table (214) to rotate one station and switch the next powder storage bottle (11) to the top of the feed inlet.

2. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, The clamping component (22) includes a support bar (221) and a clamping part (222). The support bar (221) is vertically fixed to the top surface of the turntable (214). The clamping part (222) is located on the top of the support bar (221). The clamping part (222) is an arc-shaped elastic clamping structure used to clamp and fix the body of the powder storage bottle (11) from the side.

3. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, The clamping component (22) is a clamp structure.

4. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, The transmission component (213) is a pulley transmission structure or a gear transmission structure; The drive motor (212) is a stepper motor or a servo motor.

5. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, The upper connecting plate (232) and the lower connecting plate (233) are connected by circular holes opened inside them. Each through hole of the perforated annular plate (231) forms a powder falling channel through the circular holes inside the upper connecting plate (232) and the lower connecting plate (233).

6. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, It also includes a positioning component (3), which includes multiple magnetic positioning blocks (31) and an electromagnet (32). The multiple magnetic positioning blocks (31) are fixedly arranged circumferentially at the bottom of the perforated annular plate (231) and correspond one-to-one with the position of each of the through holes. The electromagnet (32) is fixedly arranged at the top of the powder spraying device body (1) and corresponds to the position of the feed inlet. When each magnetic positioning block (31) rotates with the perforated annular plate (231) to the point of engaging with the electromagnet (32), the powder storage bottle (11) corresponding to the magnetic positioning block (31) is aligned with the feed inlet.

7. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, It also includes a receiving component (4), which is disposed below the opening and closing communication component (23) for receiving the powder falling from the opening and closing communication component (23) and guiding it to the feed inlet; The receiving component (4) includes a notched ring (41), which is located directly below the opening and closing communication component (23). The notched ring (41) has a notch corresponding to the feed port position of the powder spraying device body (1). The top surface of the notched ring (41) has an annular groove for receiving powder falling from the bottom of the opening and closing communication component (23).

8. The automatic powder storage bottle switching mechanism according to claim 7, characterized in that, The receiving assembly (4) is connected to the connector (211) via a detachable structure; The detachable structure includes a T-shaped groove plate (42) and a T-shaped tenon (43). The T-shaped groove plate (42) is fixedly mounted on the connecting seat (211) and has a T-shaped groove inside. The T-shaped tenon (43) is fixedly mounted on the bottom of the notched ring (41) and is inserted into the T-shaped groove.

9. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, It also includes a drive assembly (5), which includes a pneumatic cylinder (51) and a connector (52). The pneumatic cylinder (51) is fixedly mounted on the main body (1) of the powder spraying device. The connector (52) is connected between the piston rod of the pneumatic cylinder (51) and the opening and closing partition (234) for driving the opening and closing partition (234) to translate to open or close the powder falling channel.

10. The automatic powder storage bottle switching mechanism according to claim 1, characterized in that, The detection device is a capacitive sensor or a photoelectric sensor. When the detection device detects that the remaining powder is lower than a preset threshold, the control system controls the drive motor (212) to drive the rotary table (214) to rotate one station during the interval between printing tasks, thereby completing the automatic switching of the powder storage bottle.

11. The automatic powder storage bottle switching mechanism according to claim 10, characterized in that, After the automatic switching of the powder storage bottle is completed, the detection device synchronously sends a signal to the control system on the main body (1) of the powder spraying device, so that the main body (1) of the powder spraying device can spray powder to discharge the residual powder.

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