An array type multi-nozzle printing mechanism

Abstract

The present invention provides an array type multi-nozzle printing mechanism, including a separately arranged array nozzle module and a material storage module, the array nozzle module includes a plurality of independently arranged micro nozzles and a back-suction system, the material storage module includes a material storage unit and a material replenishment system, a flexible feeding pipe is provided between the micro nozzle and the corresponding material storage unit, and each material storage unit is independently provided with a feeding control air path; the material replenishment system is used to replenish the material when the printing material in the material storage unit is insufficient; the back-suction system is used to back-suction the material liquid flowing out of the micro nozzle. The present invention arranges the array nozzle module with a relatively small size and the material storage module with a relatively large size separately, and independently connects them with a flexible feeding pipe, and the shape of the flexible feeding pipe is changeable, so that the arrangement is more compact, and a high-density and large-quantity arrangement of the array micro nozzles can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to an array-type multi-nozzle printing mechanism. Background Art

[0002] Since direct-write printers do not require the use of traditional molds or tools, they can quickly produce complex three-dimensional objects, making them ideal for prototyping and small-batch production. In general, direct-write printers have low printing efficiency, so in order to improve printing efficiency, multiple print heads are often used to print simultaneously.

[0003] The existing array-type multi-nozzle direct-write printers mainly include the following types: (1) Arrayed printheads are constructed by combining multiple single-nozzle modules. The size of a single nozzle module is large, making it difficult to achieve high-density nozzle arrangement; (2) Arrayed nozzles are assembled using capillaries. Capillary assembled nozzles are limited by the processing technology of the capillaries themselves. Generally, the aperture is above 50 μm, and the xyz-direction error and nozzle aperture error of the array nozzle are difficult to control; (3) There are also integrated array micro-nozzles on the market. However, the array micro-nozzles processed by the integrated machine have problems such as limited aperture and difficulty in controlling aperture tolerance. The direct-write printing technology field has very high requirements for the flow consistency of micro-nozzles, and the aperture size of the micro-nozzles used in this field is often only a few microns to tens of microns. The nozzle aperture accuracy is difficult to guarantee and often has micron-level differences. This aperture difference will lead to large differences in nozzle flow, and in high-precision application fields such as semiconductors, this magnitude of difference is often unacceptable. In addition, for direct-write printing with low-viscosity ink, the ink often cannot be shut off in time after the driving pressure is turned off, causing the material to flow out and drip from the nozzle. Therefore, the existing direct-write printing nozzles are often small in number and difficult to control independently, making it impossible to achieve large-scale controllable production.

[0004] The Chinese patent literature discloses "an array micro-nozzle for direct writing printing that is easy to control independently", and its publication number is CN118386544A. It connects each printing nozzle to an independent material storage tube through an independent flow channel for pressure control, but the number of needles is limited by the space of the material storage tube layout, making it difficult to achieve large-scale needle design; and the needle feeding form of this patent is direct feeding through the material tube, which cannot achieve automatic refilling and is difficult to adapt to automated continuous production. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an array-type multi-nozzle printing mechanism to solve the problems of the existing direct writing printing heads being small in number, low in printing efficiency, difficult to independently control, and unable to achieve large-scale controllable production.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides an array-type multi-nozzle printing mechanism, including a separately arranged array nozzle module and a material storage module, the array nozzle module includes a plurality of independently arranged micro nozzles and a back-suction system, the material storage module includes a plurality of independently arranged material storage units corresponding to the micro nozzles and a material replenishment system, a flexible feeding pipe is provided between the micro nozzles and the corresponding material storage units, and each material storage unit is independently provided with a feeding control air circuit; the material replenishment system is used for replenishing the printing material in the material storage unit when the printing material is insufficient; the back-suction system is used for back-suctioning the material liquid flowing out of the micro nozzle.

[0007] The present application sets up the array nozzle module with a relatively small size and the storage module with a relatively large size separately, and connects them independently with a flexible feed pipe. The flexible feed pipe has a variable shape, so that the arrangement is more compact, and a high-density and large-quantity arrangement of the array micro nozzles can be achieved, and at least 20 to 40 micro nozzles can be arranged. The replenishment system can replenish the printing material in the storage unit in time when the printing material is insufficient to ensure the continuity of production; the back suction system is used to suck back the liquid flowing out of the micro nozzle to avoid the possibility of low-viscosity ink leaking from the micro nozzle and contaminating the equipment. Each micro nozzle is designed with an independent flow channel, and an independent storage unit is set in the storage module. The storage unit corresponds to the micro nozzle one by one and is connected through a flexible feed pipe. By applying an independently controlled air pressure to each storage pipe to achieve independent control of the pressure of each micro nozzle, the purpose of improving the flow consistency of each micro nozzle is achieved. At the same time, the array-type multi-nozzle printing mechanism often requires high-precision leveling, alignment and other fine-tuning actions on the printing equipment, and there is no rigid connection between the array nozzle module and the material storage module. Therefore, when setting the fine-tuning mechanism, only the array nozzle module with smaller size and mass needs to be adjusted, which reduces the load requirements and maintenance costs of the adjustment mechanism.

[0008] Preferably, a discharge port is formed at the bottom of the material storage unit, and the material storage units are arranged in an array with the discharge ports located in the same horizontal plane; the material replenishment system includes a material replenishment manifold plate and a sealing plate which are horizontally arranged at the bottom of the material storage unit in sequence, and the material replenishment manifold plate and the sealing plate are provided with flow channel holes corresponding to the discharge ports of the material storage units, and a groove structure is provided on the bottom surface of the material replenishment manifold plate, and a liquid replenishment flow channel is formed after the bottom surface of the material replenishment manifold plate and the top surface of the sealing plate are pressed together, and the liquid replenishment flow channel is connected to the flow channel hole, and a material replenishment feeding device is externally connected to the liquid replenishment flow channel.

[0009] Preferably, the liquid replenishment channel includes a liquid replenishment main channel arranged around the circumference of the liquid replenishment manifold and a plurality of liquid replenishment branch channels independently arranged around the channel holes. A liquid feed switch valve is provided on the top of the liquid replenishment manifold, and the liquid feed switch valve is used to control the connection and closing of the liquid replenishment main channel and the liquid replenishment branch channel.

[0010] Preferably, a feed liquid inlet and a feed liquid outlet are provided in the feed liquid switch valve, the main liquid replenishment channel is provided with a replenishment hole and a plurality of main channel valve flow channel holes corresponding to the liquid replenishment branch channels, the liquid replenishment branch channels are provided with branch channel valve flow channel holes, the main channel valve flow channel holes are connected to the feed liquid inlet, the branch channel valve flow channel holes are connected to the feed liquid outlet, and the feed liquid switch valve controls the connection and closing of the liquid replenishment main channel and the liquid replenishment branch channels by controlling the opening and closing of the valve body.

[0011] Preferably, a sealing gasket is provided between the feed manifold plate and the sealing plate, and the edge protrusions of the groove structure form a sealing flange for increasing the local compression amount of the sealing gasket to enhance the sealing performance.

[0012] Preferably, the micro-sprinkler array is arranged and located in the same horizontal plane, and the back-suction system includes a back-suction plate horizontally arranged on the side of the micro-sprinkler, a back-suction channel is formed on the top surface of the back-suction plate, a back-suction component is provided at one end of the back-suction channel close to the micro-sprinkler, and a negative pressure generating device is externally connected to the other end; the back-suction component is in contact with the micro-sprinkler, and is used to back-suction the liquid flowing out of the micro-sprinkler.

[0013] Preferably, the back-suction channel includes a back-suction branch channel and a back-suction main channel that are interconnected, and the back-suction branch channel is arranged corresponding to each micro-sprinkler; a slot is arranged on the side of the back-suction plate close to the micro-sprinkler, and the slot is connected to the back-suction channel; the back-suction assembly includes a guide plate arranged in the slot and a plurality of guide strips corresponding to the micro-sprinklers formed on the side of the guide plate close to the micro-sprinkler, the end of the guide strip is sleeved on the outer wall of the micro-sprinkler, and the guide strip is formed with a back-suction slit along the length direction, and the back-suction slit is connected to the back-suction branch channel. The capillary effect of the back-suction slit is used to guide the leaked ink to the guide plate and back-suction it through the back-suction main channel under the action of negative pressure, thereby avoiding the possibility of low-viscosity ink leaking from the nozzle and contaminating the equipment.

[0014] Preferably, a baffle is provided at the bottom of the guide plate that does not contact the micro-sprinkler, and the baffle is used to guide the direction of the back-inhalation airflow, thereby reducing the air flow generated by the back-inhalation negative pressure near the micro-sprinkler as much as possible, reducing the impact of the back-inhalation airflow on the temperature of the micro-sprinkler, and thus improving the flow stability of the micro-sprinkler.

[0015] Preferably, the re-suction assembly also includes a limit groove horizontally arranged at the end of the slot and a locking piece passing through the limit groove, and the limit groove extends upward in the vertical direction at one end close to the guide plate to form an abutment surface, and the abutment surface abuts against the ends of the guide plate and the baffle; the locking piece is used to apply a locking force to the contact surface between the guide plate and the baffle and the slot to prevent the guide plate and the baffle from falling off from the slot.

[0016] More preferably, a suction sealing pad is installed between the suction plate and the micro-sprinklers to seal the suction channel on the top of the suction plate and to provide heat insulation to prevent the suction airflow from affecting the temperature stability of the array micro-sprinklers.

[0017] Preferably, the slot is arranged obliquely upward in a direction away from the micro sprinkler.

[0018] Preferably, the re-suction slit is a long hollow structure.

[0019] Preferably, the surface of the guide plate is subjected to a hydrophilic treatment, and the hydrophilic treatment includes applying a hydrophilic coating, increasing the surface roughness, etc., so as to improve the guide effect.

[0020] Preferably, the material storage module is further provided with a primary filtering system, and the primary filtering system is used to filter the material liquid in the material storage unit before it enters the flexible feeding pipe.

[0021] Preferably, the material storage module also includes a material storage unit fixing plate arranged above the material storage unit; the primary filtration system includes an upper filter plate and a lower filter plate which are sequentially arranged below the sealing plate, the upper filter plate and the lower filter plate are provided with a plurality of filter holes corresponding to the discharge port, the bottom surface of the upper filter plate is located at the position of the filter hole and is recessed upward to form an upper filter chamber, the top surface of the lower filter plate is located at the position of the filter hole and is recessed downward to form a lower filter chamber, and a primary filter screen is provided between the upper filter chamber and the lower filter chamber.

[0022] Preferably, the array nozzle module also includes a nozzle mounting structure, which includes a nozzle mounting plate, a plurality of nozzle mounting holes arranged on the nozzle mounting plate, a top pressure groove and a top pressure elastic member; the top pressure groove is perpendicular to the nozzle mounting hole and passes through the nozzle mounting plate, and the top pressure groove and the nozzle mounting hole partially intersect and overlap; the top pressure elastic member is installed in the top pressure groove in a compressed state to generate a top pressure on the micro nozzle that is attached to the other side wall of the nozzle mounting hole.

[0023] Preferably, a V-shaped mounting surface is formed on the inner wall of the nozzle mounting hole on one side away from the top pressure elastic member, and higher positioning accuracy and position stability can be achieved by fine-tuning the position of the micro-sprinkler and fixing it with glue.

[0024] Preferably, the array-type multi-nozzle printing mechanism also includes an upper feed tube adapter assembly and a lower feed tube adapter assembly, wherein the upper feed tube adapter assembly is used to achieve a sealed connection between the upper end of the flexible feed tube and the material storage module; the lower feed tube adapter assembly is used to achieve a sealed connection between the lower end of the flexible feed tube and the array nozzle module.

[0025] Preferably, the upper adapter assembly of the feed pipe includes, from top to bottom, an upper adapter plate and an upper pressure plate, the upper adapter plate is provided with a plurality of feed holes corresponding to the storage unit, the bottom surface of the upper adapter plate protrudes downward along the edge of the feed hole to form an upper adapter joint, the upper end of the flexible feed pipe is sleeved on the outer wall of the upper adapter joint, the upper pressure plate is penetrated by an upper stepped hole corresponding to the feed hole, the upper stepped hole includes, from top to bottom, an upper joint portion and a connecting pipe portion, the upper joint portion is adapted to the upper adapter joint, and the connecting pipe portion is adapted to the flexible feed pipe.

[0026] Preferably, the lower adapter assembly of the feed pipe includes, from bottom to top, a lower adapter plate and a lower pressure plate, the lower adapter plate is provided with a plurality of discharge holes corresponding to the micro-sprinklers, the top surface of the lower adapter plate protrudes upward along the edge of the discharge hole to form a lower adapter joint, the lower end of the flexible feed pipe is sleeved on the outer wall of the lower adapter joint, the lower pressure plate is penetrated by a lower stepped hole corresponding to the discharge hole, the lower stepped hole includes, from top to bottom, a lower connecting pipe portion and a lower joint portion, the lower connecting pipe portion is adapted to the flexible feed pipe; the lower joint portion is adapted to the lower adapter joint.

[0027] Preferably, the array nozzle module further comprises a secondary filtering system disposed on the top surface of the nozzle mounting plate, and the secondary filtering system is used for performing secondary filtering on the feed liquid before the feed liquid enters the micro nozzle.

[0028] Preferably, the secondary filtration system comprises at least two layers of sealing membranes and a secondary filter screen arranged between the sealing membranes, the sealing membrane is provided with a plurality of flow holes corresponding to the nozzle mounting holes, the area of ​​the secondary filter screen is smaller than the sealing membrane and covers all the flow holes.

[0029] Preferably, the array nozzle module also includes a temperature control system, which includes a heat conductive block, a semiconductor refrigeration sheet and a heat sink. The heat conductive block is used to control the temperature of the micro-nozzle. The semiconductor refrigeration sheet is arranged between the heat conductive block and the heat sink. A temperature sensor is arranged in the heat conductive block. The temperature sensor is used to detect the temperature in real time and provide feedback. The semiconductor refrigeration sheet is used to heat or cool the heat conductive block according to the temperature feedback of the temperature sensor to achieve two-way precise temperature control of the heat conductive block. The heat sink is used to dissipate heat or absorb heat from the semiconductor refrigeration sheet.

[0030] In situations where the cooling or heating power is high, a fan can be used to force air cooling on the radiator; or a constant temperature water cooling circulation heat dissipation method can be used to control the temperature of the back of the semiconductor refrigeration plate, which can further improve the accuracy and anti-disturbance ability of the temperature control system. This application does not use a water cooling circulation device to directly control the temperature of the micro-sprinkler because the water cooling accuracy is not as good as the temperature control accuracy of refrigeration.

[0031] Preferably, a limit stopper is provided at the bottom of the heat conducting block, and the limit stopper is used to locate the relative position of the heat conducting block and the micro nozzle.

[0032] More preferably, the micro-sprinkler is provided with an insulation sleeve to wrap the tip of the micro-sprinkler to achieve the purpose of insulation; the insulation sleeve is preferably made of a plastic material with low thermal conductivity; the insulation sleeve is installed by pressing and cooperating with the micro-sprinkler through the guide strip.

[0033] Preferably, a liquid level sensor is installed on the side of the material storage unit, and the sensor is preferably a non-contact sensor to ensure the cleanliness of the system; it can be a capacitive sensor or a photoelectric sensor.

[0034] As described above, the present invention has the following beneficial effects:

[0035] (1) By separately arranging a relatively small array nozzle module and a relatively large storage module, and independently connecting them with a flexible feeding pipe, the shape of the flexible feeding pipe can be changed, making the arrangement more compact, and realizing a high-density and large-quantity arrangement of the array micro nozzles;

[0036] (2) When the printing material in the storage unit is insufficient, the material can be replenished in time through the material replenishment system to ensure the continuity of production; the suction system is used to suck back the material liquid flowing out of the micro nozzle to avoid the possibility of low-viscosity ink leaking from the micro nozzle and contaminating the equipment; by applying independently controlled air pressure to each storage tube to achieve independent control of the pressure of each micro nozzle, the purpose of improving the flow consistency of each micro nozzle is achieved;

[0037] (3) By using a flexible connection between the array nozzle module and the material storage module, when setting the fine-tuning mechanism, only the array nozzle module with smaller size and mass needs to be adjusted, which reduces the load requirements and maintenance costs of adjusting the printing mechanism;

[0038] (4) A V-shaped mounting surface is formed on the inner wall of the nozzle mounting hole on the side away from the top pressure elastic member, and a higher positioning accuracy and position stability are achieved by fine-tuning the position of the micro-nozzle and fixing it with glue; a temperature control device is designed outside the array micro-nozzle to control the temperature of the array nozzle and prevent the external environmental temperature fluctuation from affecting the material in the print head. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Shown is one of the structural schematic diagrams of an array-type multi-nozzle printing mechanism.

[0040] Figure 2 Display as Figure 1 Left view of .

[0041] Figure 3 Display as Figure 1 Front view of.

[0042] Figure 4 Display as Figure 3 Cross-sectional view along the AA direction.

[0043] Figure 5 Display as Figure 4 A partial enlarged view of point B in the middle.

[0044] Figure 6 Display as Figure 5 A partial enlarged view of point D in the middle.

[0045] Figure 7 Display as Figure 6 A partial enlarged view of point E in the middle.

[0046] Figure 8 Shown is a schematic diagram of the structure of the suction plate.

[0047] Fig. 9 Display as Figure 1 A partial enlarged view of point A in the middle.

[0048] Fig.10 Display as Figure 4 A partial enlarged view of point C in the middle.

[0049] Fig.11 Shown is a schematic diagram of the structure of the feed manifold.

[0050] Fig.12 Shown is an exploded schematic diagram of a two-stage filtration system.

[0051] Description of the accompanying drawings: array nozzle module 1, micro nozzle 11, insulation sleeve 111, nozzle mounting plate 12, sealing membrane 121, secondary filter 122, flow hole 123, top pressure elastic member 124, storage module 2, storage unit 21, storage unit upper cover 211, gas joint 212, storage unit fixing plate 22, support column 23, flexible feed pipe 3, upper pressure plate 31, upper adapter 33, upper joint part 34, connecting pipe part 35, lower adapter plate 36, lower adapter 361, lower pressure plate 37, lower connecting pipe part 38, lower joint part 39, feed manifold 4, sealing plate 41, filter upper plate 411, filter lower plate 412, upper filter chamber 413, lower filter chamber 414, lower filter chamber 415, lower filter chamber 416, upper filter chamber 417, upper filter chamber 418, upper filter chamber 419, upper filter chamber 420, upper filter chamber 421, upper filter chamber 422, upper filter chamber 423, upper filter chamber 424, upper filter chamber 425, upper filter chamber 426, upper filter chamber 427, upper filter chamber 428, upper filter chamber 429, upper filter chamber 430, upper filter chamber 431, upper filter chamber 432, upper filter chamber 433, upper filter chamber 434, upper filter chamber 435, upper filter chamber 436, upper filter chamber 437, upper filter chamber 438, lower filter chamber 43 ...9, upper filter chamber 43 Filter chamber 414, primary filter screen 415, first sealing ring 416, filter screen support 417, second sealing ring 418, flow channel hole 42, liquid replenishment main channel 43, feed replenishment hole 431, main channel valve flow channel hole 432, feed replenishment pipe 433, liquid replenishment branch channel 44, branch channel valve flow channel hole 441, feed liquid switch valve 45, sealing flange 46, back-suction plate 5, back-suction branch channel 51, back-suction main flow channel 52, suction port 521, suction joint 522, slot 53, limit groove 531, locking piece 532, abutment surface 533, guide plate 54, guide strip 55, back-suction slit 551, baffle 56, heat conductive block 6, semiconductor cooling plate 7, radiator 8, limit block 61. DETAILED DESCRIPTION

[0052] 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 creative work are within the scope of protection of the present invention.

[0053] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] Unless otherwise clearly specified and limited, the terms "connection", "fixation" and "setting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] like Figure 1 As shown, the embodiment of the present application provides an array type multi-nozzle printing mechanism, including a separately arranged array nozzle module 1, a material storage module 2, a feed pipe upper adapter component, a feed pipe lower adapter component and a temperature control system, such as Fig.11 As shown, the array nozzle module includes 20 independently arranged micro nozzles 11, a back-suction system and a nozzle mounting structure. The micro nozzles are arranged in an array and located at the same horizontal plane. The micro nozzles are provided with a heat preservation sleeve 111 outside. The storage module includes a storage unit fixing plate 22, 20 storage units 21 independently arranged on the storage unit fixing plate and corresponding to the micro nozzles, a feeding system and a primary filtering system. The primary filtering system is used to filter the liquid in the storage unit before it enters the flexible feeding pipe. A discharge port is formed at the bottom of the storage unit. The storage units are arranged in a display and the discharge ports are located at the same horizontal plane. A flexible feeding pipe 3 is provided between the micro nozzle and its corresponding storage unit. The upper adapter assembly of the feeding pipe is used to realize the sealing connection between the upper end of the flexible feeding pipe and the storage module; the lower adapter assembly of the feeding pipe is used to realize the sealing connection between the lower end of the flexible feeding pipe and the array nozzle module. Each material storage unit is independently provided with a material supply control air circuit. The material replenishment system is used to replenish the material when the printing material in the material storage unit is insufficient; the back-sucking system is used to back-suck the material liquid flowing out of the micro-spray head.

[0056] like Figure 3 , Figure 4 and Figure 5 As shown, the nozzle mounting structure includes a nozzle mounting plate 12, a plurality of nozzle mounting holes provided on the nozzle mounting plate, a top pressure groove and a top pressure elastic member 124; the top pressure groove is perpendicular to the nozzle mounting hole and penetrates the nozzle mounting plate, and the top pressure groove and the nozzle mounting hole partially intersect and overlap; the top pressure elastic member is installed in the top pressure groove in a compressed state to generate a top pressure applied to the micro-sprinkler to fit the other side wall of the nozzle mounting hole. A V-shaped mounting surface is formed on the inner wall of the nozzle mounting hole away from the top pressure elastic member, and a higher positioning accuracy and position stability are obtained by fine-tuning the position of the micro-sprinkler and fixing it with glue. After the nozzle mounting plate and the micro-sprinkler are installed in place, they are fixed by glue. An outer glue filling groove is provided on one side of the nozzle mounting hole close to the tip of the micro-sprinkler for bonding and fixing the micro-sprinkler; an inner glue filling groove is provided on the other side for bonding and fixing the micro-sprinkler and achieving sealing between the micro-sprinkler and the nozzle mounting plate.

[0057] like Figure 2 As shown, the feeding system includes a feeding manifold 4 and a sealing plate 41 which are arranged horizontally at the bottom of the storage unit in sequence. The bottom surface of the feeding manifold and the sealing plate are pressed together by screws, and a sealing gasket is installed between the two. Fig.11As shown, the feed replenishment manifold plate and the sealing plate are provided with a flow channel hole 42 corresponding to the discharge port of the material storage unit, and the bottom surface of the feed replenishment manifold plate is provided with a groove structure, and the groove structure forms a liquid replenishment flow channel after the bottom surface of the feed replenishment manifold plate and the top surface of the sealing plate are pressed together, and the liquid replenishment flow channel is connected to the flow channel hole, and the liquid replenishment flow channel is externally connected to a feed replenishment feeding device.

[0058] like Figure 2 As shown, a storage unit upper cover 211 and a plurality of gas joints 212 are installed above the storage unit fixing plate, and each gas joint is used to be connected to an external pressure controller. The storage unit fixing plate and the storage unit upper cover are connected by screws. A support column 23 is vertically arranged between the storage unit fixing plate 22 and the replenishment manifold 4 for connecting the two, and threaded holes are formed at both ends of the support column, and the two ends are installed by screws. The storage tube is also clamped and installed between the storage unit fixing plate and the replenishment manifold, and the clamping force is provided by the support column. The storage unit can adopt a storage tube for storing ink, which is transparent or translucent, preferably PP plastic. The body of the storage tube is cylindrical and inserted into the mounting hole of the storage unit fixing plate as a whole; the tail of the storage tube is ear-shaped and cannot pass through the mounting hole of the storage unit fixing plate; the ears at the tail of the storage tube are pressed between the storage unit fixing plate and the storage unit upper cover to achieve fixation between the three parts. The lower part of the upper cover of the material storage tube is formed with a columnar protrusion which is inserted into the inner hole of the tail of the material storage tube, and a sealing ring is added between the two to achieve sealing. A liquid level sensor is installed on the side of the material storage unit. The sensor is preferably a non-contact sensor to ensure the cleanliness of the system; it can be a capacitive sensor or a photoelectric sensor. Fig.11 As shown, the flow channel hole adopts a conical structure. After the head of the material storage tube is inserted into the flow channel hole in the material replenishment manifold, the head of the material storage tube is pressed into the flow channel hole by locking the support column screw, and the conical surfaces of the two are tightly matched to achieve sealing. The liquid replenishment flow channel includes a liquid replenishment main flow channel 43 arranged around the circumference of the material replenishment manifold and a plurality of liquid replenishment branch flow channels 44 independently arranged around the flow channel hole, and the edge of the groove structure is raised to form a sealing flange 46.

[0059] Combination Figure 4 , a feed liquid switch valve 45 is provided on the top of the feed replenishment manifold, and the feed liquid switch valve is used to control the connection and closing of the replenishment main channel and the replenishment branch channel. Specifically, a feed liquid inlet and a feed liquid outlet are provided in the feed liquid switch valve, the replenishment main channel is provided with a feed replenishment hole 431 and a plurality of main channel valve flow channel holes 432 corresponding to the replenishment branch channels, the replenishment branch channels are provided with branch channel valve flow channel holes 441, the main channel valve flow channel holes are connected to the feed liquid inlet, and the branch channel valve flow channel holes are connected to the feed liquid outlet, and the feed liquid switch valve controls the connection and closing of the replenishment main channel and the replenishment branch channel by controlling the opening and closing of the valve body. Figure 2 As shown, the feed hole is connected to a feed pipe 433, and the feed pipe is externally connected to a feed supply device.

[0060] like Figure 2 As shown, the back-suction system includes a back-suction plate 5 horizontally arranged on the side of the micro-sprinkler. Figure 8 As shown, the top surface of the re-suction plate is formed with a re-suction channel, one end of the re-suction channel close to the micro-sprinkler is provided with a re-suction component, and the other end is externally connected to a negative pressure generating device; the re-suction component is in contact with the micro-sprinkler and is used to re-suction the liquid flowing out of the micro-sprinkler. The re-suction channel includes a re-suction branch channel 51 and a re-suction main channel 52 which are interconnected.

[0061] like Figure 5 As shown, the main back-suction channel is connected to a suction port 521, and the suction port is provided with a suction connector 522, which is connected to a negative pressure generating device. Figure 8 As shown, the suction branch channel is arranged corresponding to each micro-sprinkler; a slot 53 is provided on the side of the suction plate close to the micro-sprinkler, and the slot is connected to the suction channel, as shown in FIG. Figure 6 As shown, the slot is arranged upwardly and tilted away from the micro-sprinkler, and a limit groove 531 is horizontally arranged at the end of the slot. A locking member 532 is provided in the limit groove, and the locking member is used to apply a locking force to the contact surface between the guide plate and the baffle plate and the slot to prevent the guide plate and the baffle plate from falling out of the slot. The back-suction assembly includes a guide plate 54 arranged in the slot and a plurality of guide strips 55 corresponding to the micro-sprinkler formed on the side of the guide plate close to the micro-sprinkler, and a baffle 56 is provided at the bottom of the guide plate that does not contact the micro-sprinkler, and the baffle plate is used to guide the direction of the back-suction airflow. Figure 7 As shown, the end of the limit groove near the guide plate extends upward in the vertical direction to form an abutment surface 533, which abuts against the ends of the guide plate and the baffle. A back-suction sealing pad is installed between the back-suction plate and the micro-sprinkler to seal the back-suction flow channel at the top of the back-suction plate and play a heat insulation role to prevent the back-suction airflow from affecting the temperature stability of the micro-sprinkler.

[0062] like Fig. 9 As shown, the end of the guide strip is sleeved on the outer wall of the micro-sprinkler, and the insulation sleeve 111 is installed by pressing the guide strip and the micro-sprinkler together. The guide strip is formed with a back-suction slit 551 along the length direction. The back-suction slit is a long hollow structure, and the back-suction slit is connected to the back-suction branch channel. The surface of the guide plate is provided with a hydrophilic coating. The back-suction path is as shown in FIG. Figure 6 shown.

[0063] like Figure 2 As shown, the primary filtration system includes an upper filtration plate 411 and a lower filtration plate 412 which are sequentially arranged below the sealing plate. The upper filtration plate and the lower filtration plate are provided with a plurality of filtration holes corresponding to the discharge port, such as Fig.10As shown, the bottom surface of the upper filter plate is located at the position of the filter hole and is recessed upward to form an upper filter chamber 413, and the top surface of the lower filter plate is located at the position of the filter hole and is recessed downward to form a lower filter chamber 414, a primary filter screen 415 is provided between the upper filter chamber and the lower filter chamber, a filter screen support 417 is provided at the bottom of the primary filter screen, a first sealing ring 416 is provided at the pressing point of the upper filter plate 411 and the lower filter plate 412, and a second sealing ring 418 is provided at the pressing point of the sealing plate 41 and the upper filter plate 411 to prevent liquid leakage.

[0064] like Figure 4 and Fig.10 As shown, the feed pipe upper adapter assembly includes an upper adapter plate and an upper pressure plate 31 from top to bottom, the upper adapter plate is provided with a plurality of feed holes corresponding to the storage unit, the bottom surface of the upper adapter plate protrudes downward along the edge of the feed hole to form an upper adapter 33, the upper end of the flexible feed pipe is sleeved on the outer wall of the upper adapter, the upper pressure plate is penetrated with an upper stepped hole corresponding to the feed hole, the upper stepped hole includes an upper joint part 34 and a connecting pipe part 35 from top to bottom, the upper joint part is adapted to the upper adapter, and the connecting pipe part is adapted to the flexible feed pipe. In this embodiment, the upper adapter plate adopts a filter lower plate 412.

[0065] like Figure 5 As shown, the lower adapter assembly of the feed pipe includes, from bottom to top, a lower adapter plate 36 and a lower pressure plate 37, the lower adapter plate is provided with a plurality of discharge holes corresponding to the micro-sprinklers, the top surface of the lower adapter plate protrudes upward along the edge of the discharge hole to form a lower adapter joint 361, the lower end of the flexible feed pipe is sleeved on the outer wall of the lower adapter joint, the lower pressure plate is penetrated by a lower stepped hole corresponding to the discharge hole, the lower stepped hole includes, from top to bottom, a lower connecting pipe portion 38 and a lower joint portion 39, the lower connecting pipe portion is adapted to the flexible feed pipe; the lower joint portion is adapted to the lower adapter joint.

[0066] The top surface of the nozzle mounting plate is provided with a secondary filtration system, which is used to perform secondary filtration on the liquid before it enters the micro nozzle. Fig.12 As shown, the secondary filtration system includes at least two layers of sealing membranes 121 and a secondary filter screen 122 arranged between the sealing membranes. The sealing membrane is provided with a plurality of flow holes 123 corresponding to the nozzle mounting holes. The area of ​​the secondary filter screen is smaller than the sealing membrane and covers all the flow holes.

[0067] like Figure 2As shown, the temperature control system includes a heat conducting block 6, a semiconductor cooling sheet 7 and a heat sink 8. The heat conducting block is connected to the micro sprinkler by screws, and the contact surface thereof serves as a heat conducting surface. The heat conducting block is used to control the temperature of the micro sprinkler. The semiconductor cooling sheet is arranged between the heat conducting block and the heat sink. A temperature sensor is arranged inside the heat conducting block. The temperature sensor is used to detect the temperature in real time and provide feedback. The semiconductor cooling sheet is used to heat or cool the heat conducting block according to the temperature feedback of the temperature sensor to achieve bidirectional precise temperature control of the heat conducting block. The heat sink is provided with heat dissipation fins. The heat sink is used to dissipate heat or absorb heat from the semiconductor cooling sheet. A limit stopper 61 is arranged at the bottom of the heat conducting block. The limit stopper is used to locate the relative position of the heat conducting block and the micro sprinkler.

[0068] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An array-type multi-nozzle printing mechanism, characterized in that: The invention comprises a separately arranged array nozzle module (1) and a material storage module (2), wherein the array nozzle module comprises a plurality of independently arranged micro nozzles (11) and a back-suction system, and the material storage module comprises a plurality of independently arranged material storage units (21) corresponding to the micro nozzles and a material replenishment system, wherein a flexible material feeding pipe (3) is arranged between the micro nozzles and the corresponding material storage units, and each material storage unit is independently provided with a material supply control air path; the material replenishment system is used to replenish the material when the printing material in the material storage unit is insufficient; the back-suction system is used to back-suction the material liquid flowing out of the micro nozzles; the back-suction system comprises a back-suction plate (5), a back-suction flow channel is formed on the top surface of the back-suction plate, a back-suction assembly is arranged at one end of the back-suction flow channel, and a negative pressure generating device is externally connected to the other end; a slot (53) is arranged on one side of the back-suction plate, the slot is connected to the back-suction flow channel, and the back-suction assembly comprises a guide plate (54) arranged in the slot and a guide strip (55) formed on the guide plate and corresponding to the micro nozzles.

2. The array-type multi-nozzle printing mechanism according to claim 1, characterized in that: A discharge port is formed at the bottom of the material storage unit, and the material storage units are arranged in an array with the discharge ports located in the same horizontal plane; the feeding system comprises a feeding manifold (4) and a sealing plate (41) which are horizontally arranged at the bottom of the material storage unit in sequence, the feeding manifold and the sealing plate are provided with flow channel holes (42) corresponding to the discharge ports of the material storage units, the bottom surface of the feeding manifold is provided with a groove structure, and the groove structure forms a liquid replenishment flow channel after the bottom surface of the feeding manifold and the top surface of the sealing plate are pressed together, the liquid replenishment flow channel is connected to the flow channel hole, and the liquid replenishment flow channel is externally connected to a feeding device.

3. The array-type multi-nozzle printing mechanism according to claim 2, characterized in that: The liquid replenishment flow channel comprises a liquid replenishment main flow channel (43) arranged around the circumference of the liquid replenishment manifold and a plurality of liquid replenishment branch flow channels (44) independently arranged around the flow channel holes. A liquid feed switch valve (45) is provided on the top of the liquid replenishment manifold, and the liquid feed switch valve is used to control the connection and closing of the liquid replenishment main flow channel and the liquid replenishment branch flow channels.

4. The array-type multi-nozzle printing mechanism according to claim 3, characterized in that: The liquid switch valve is provided with a liquid inlet and a liquid outlet, the main liquid replenishment channel is provided with a replenishment hole (431) and a plurality of main liquid replenishment channel valve flow channel holes (432) corresponding to the liquid replenishment branch channels, the liquid replenishment branch channels are provided with branch channel valve flow channel holes (441), the main liquid replenishment channel valve flow channel holes are connected to the liquid inlet, and the branch channel valve flow channel holes are connected to the liquid outlet, and the liquid switch valve controls the connection and closing of the liquid replenishment main liquid replenishment channel and the liquid replenishment branch channels by controlling the opening and closing of the valve body.

5. The array-type multi-nozzle printing mechanism according to any one of claims 2 to 4, characterized in that: A sealing gasket is provided between the feed manifold plate and the sealing plate, and the edge of the groove structure is raised to form a sealing flange (46).

6. The array-type multi-nozzle printing mechanism according to claim 1, characterized in that: The micro-sprinklers are arranged in an array and located on the same horizontal plane. The re-absorption plate is horizontally arranged on the side of the micro-sprinklers. The re-absorption component is in contact with the micro-sprinklers and is used for re-absorb the liquid flowing out of the micro-sprinklers.

7. The array-type multi-nozzle printing mechanism according to claim 6, characterized in that: The back-suction flow channel comprises a back-suction branch flow channel (51) and a back-suction main flow channel (52) which are interconnected, and the back-suction branch flow channels are arranged corresponding to each micro-sprinkler; the slot is arranged on a side of the back-suction plate close to the micro-sprinkler, and the guide strip is arranged on a side of the guide plate close to the micro-sprinkler, and the end of the guide strip is sleeved on the outer wall of the micro-sprinkler, and the guide strip is formed with a back-suction slit (551) along the length direction, and the back-suction slit is connected to the back-suction branch flow channel.

8. The array-type multi-nozzle printing mechanism according to claim 7, characterized in that: A baffle (56) is provided at the bottom of the guide plate that does not contact the micro-sprinkler, and the baffle is used to guide the direction of the return airflow.

9. The array-type multi-nozzle printing mechanism according to claim 7, characterized in that: The re-absorption assembly further comprises a limit groove (531) horizontally arranged at the end of the slot and a locking member (532) penetrating the limit groove, wherein one end of the limit groove close to the guide plate extends upward in a vertical direction to form an abutment surface (533), wherein the abutment surface abuts against the ends of the guide plate and the baffle plate; and the locking member is used to apply a locking force to the contact surface between the guide plate and the baffle plate and the slot to prevent the guide plate and the baffle plate from falling off from the slot.

10. The array-type multi-nozzle printing mechanism according to claim 9, characterized in that: The slot is arranged to be inclined upward in a direction away from the micro-sprinkler; the back-suction slit is a long hollow structure; and the surface of the guide plate is treated with hydrophilicity.

11. The array-type multi-nozzle printing mechanism according to claim 2, characterized in that: The material storage module is also provided with a primary filtering system, and the primary filtering system is used to filter the material liquid in the material storage unit before it enters the flexible feeding pipe.

12. The array-type multi-nozzle printing mechanism according to claim 11, characterized in that: The material storage module also includes a material storage unit fixing plate (22) arranged above the material storage unit; the primary filtering system includes an upper filter plate (411) and a lower filter plate (412) arranged in sequence below the sealing plate, the upper filter plate and the lower filter plate are provided with a plurality of filter holes corresponding to the material outlet, the bottom surface of the upper filter plate is located at the position of the filter holes and is recessed upward to form an upper filter chamber (413), the top surface of the lower filter plate is located at the position of the filter holes and is recessed downward to form a lower filter chamber (414), and a primary filter screen (415) is provided between the upper filter chamber and the lower filter chamber.

13. The array-type multi-nozzle printing mechanism according to claim 1, characterized in that: The array nozzle module also includes a nozzle mounting structure, which includes a nozzle mounting plate (12), a plurality of nozzle mounting holes provided on the nozzle mounting plate, a top pressure groove and a top pressure elastic member (124); the top pressure groove is perpendicular to the nozzle mounting hole and passes through the nozzle mounting plate, and the top pressure groove and the nozzle mounting hole partially intersect and overlap; the top pressure elastic member is installed in the top pressure groove in a compressed state to generate a top pressure applied to the micro nozzle to fit the other side wall of the nozzle mounting hole.

14. The array-type multi-nozzle printing mechanism according to claim 13, characterized in that: A V-shaped mounting surface is formed on the inner wall of the nozzle mounting hole at one side away from the top-pressing elastic member.

15. The array-type multi-nozzle printing mechanism according to claim 1, characterized in that: The array-type multi-nozzle printing mechanism also includes an upper feed tube adapter assembly and a lower feed tube adapter assembly. The upper feed tube adapter assembly is used to achieve a sealed connection between the upper end of the flexible feed tube and the material storage module; the lower feed tube adapter assembly is used to achieve a sealed connection between the lower end of the flexible feed tube and the array nozzle module.

16. The array-type multi-nozzle printing mechanism according to claim 15, characterized in that: The feed pipe upper adapter assembly comprises, from top to bottom, an upper adapter plate and an upper pressure plate (31), the upper adapter plate being provided with a plurality of feed holes corresponding to the material storage units, the bottom surface of the upper adapter plate protruding downward along the edge of the feed hole to form an upper adapter joint (33), the upper end of the flexible feed pipe being sleeved on the outer wall of the upper adapter joint, the upper pressure plate being penetrated by an upper stepped hole corresponding to the feed hole, the upper stepped hole comprising, from top to bottom, an upper joint portion (34) and a connecting pipe portion (35), the upper joint portion being adapted to the upper adapter joint, and the connecting pipe portion being adapted to the flexible feed pipe.

17. The array-type multi-nozzle printing mechanism according to claim 15, characterized in that: The feed pipe lower adapter assembly comprises, from bottom to top, a lower adapter plate (36) and a lower pressure plate (37), the lower adapter plate being provided with a plurality of discharge holes corresponding to the micro-sprinklers, the top surface of the lower adapter plate being upwardly protruding along the edge of the discharge hole to form a lower adapter joint (361), the lower end of the flexible feed pipe being sleeved on the outer wall of the lower adapter joint, the lower pressure plate being penetrated by a lower stepped hole corresponding to the discharge hole, the lower stepped hole comprising, from top to bottom, a lower connecting pipe portion (38) and a lower joint portion (39), the lower connecting pipe portion being adapted to the flexible feed pipe; the lower joint portion being adapted to the lower adapter joint.

18. The array-type multi-nozzle printing mechanism according to claim 13, characterized in that: The array nozzle module also includes a secondary filtering system arranged on the top surface of the nozzle mounting plate, and the secondary filtering system is used for performing secondary filtering on the feed liquid before the feed liquid enters the micro nozzle.

19. The array-type multi-nozzle printing mechanism according to claim 18, characterized in that: The secondary filtration system comprises at least two layers of sealing membranes (121) and a secondary filter screen (122) disposed between the sealing membranes, the sealing membrane being provided with a plurality of flow holes (123) corresponding to the nozzle mounting holes, the secondary filter screen having an area smaller than the sealing membrane and covering all the flow holes.

20. The array-type multi-nozzle printing mechanism according to claim 1, characterized in that: The array nozzle module also includes a temperature control system, which includes a heat conductive block (6), a semiconductor cooling sheet (7) and a heat sink (8). The heat conductive block is used to control the temperature of the micro nozzle. The semiconductor cooling sheet is arranged between the heat conductive block and the heat sink. A temperature sensor is arranged in the heat conductive block. The temperature sensor is used to detect the temperature in real time and provide feedback. The semiconductor cooling sheet is used to heat or cool the heat conductive block according to the temperature feedback of the temperature sensor to achieve bidirectional precise temperature control of the heat conductive block. The heat sink is used to dissipate heat or absorb heat from the semiconductor cooling sheet.

21. The array-type multi-nozzle printing mechanism according to claim 20, characterized in that: A limit stopper (61) is provided at the bottom of the heat conducting block, and the limit stopper is used to locate the relative position of the heat conducting block and the micro nozzle.

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