An array-type multi-nozzle tail liquid back suction device

Abstract

This invention provides an array-type multi-nozzle tail liquid back suction device, including a micro-nozzle array and a back suction plate disposed on the side of the micro-nozzle array. The micro-nozzle array includes a plurality of micro-nozzles arranged in an array. The back suction plate forms a back suction channel. A flow guiding component is provided at one end of the back suction channel near the micro-nozzle, and a negative pressure generating device is externally connected to the other end. The flow guiding component contacts the micro-nozzle and is used to guide the liquid flowing out of the micro-nozzle to the back suction channel. This invention, by setting a back suction plate on the side of the micro-nozzle array and using negative pressure and a flow guiding component to guide the liquid flowing out of the micro-nozzle to the back suction channel, and with the back suction channel externally connected to a liquid recovery device, avoids the possibility of low-viscosity ink leaking from the micro-nozzle and contaminating the equipment.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to an array-type multi-nozzle tail liquid back suction device. Background Technology

[0002] In the field of 3D printing technology, due to the low efficiency of a single printhead, the industry often increases the number of printheads to improve efficiency, leading to the development of array-type multi-printhead printing mechanisms. However, when applied to direct-write printing with low-viscosity inks, array-type multi-printhead printing mechanisms often experience ink leakage after the drive pressure is turned off, causing material to flow out and drip from the printhead, potentially contaminating the equipment.

[0003] A Chinese patent document, CN 114054287A, discloses a photoresist back-suction device, comprising a monitor, a back-suction mechanism, and a controller. The monitor is installed on the photoresist coating equipment to monitor the photoresist column in the photoresist nozzle. The back-suction mechanism is located on the photoresist pipeline of the photoresist coating equipment. The adjustment component in the back-suction mechanism is used to adjust the back-suction amount of photoresist in the photoresist pipeline to control the position of the photoresist column in the photoresist nozzle connected to the photoresist pipeline. The controller is connected to the monitor and the back-suction mechanism to receive the signal feedback from the monitor and to control the opening and closing of the back-suction mechanism. This patent, by installing a monitor, controller, and on / off backflow mechanism on the photoresist coating equipment, can monitor and control the flow rate of photoresist in the photoresist pipeline in real time, thereby controlling the photoresist in the photoresist nozzle and preventing it from condensing or dripping. It is evident that this patent achieves photoresist backflow through a control system, which is costly and cannot be applied to the backflow of tail liquid from multiple nozzles in an array-type multi-nozzle system. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an array-type multi-nozzle tail liquid back suction device to solve the problem that when the existing array-type multi-nozzle printing mechanism is used for direct writing printing with low viscosity ink, the ink often cannot be shut off in time after the driving pressure is turned off, causing material to flow out and drip from the nozzle, which contaminates the equipment.

[0005] To achieve the above and other related objectives, the present invention provides an array-type multi-nozzle tail liquid back suction device, comprising a micro-nozzle array and a back suction plate disposed on the side of the micro-nozzle array. The micro-nozzle array includes a plurality of micro-nozzles arranged in an array. The back suction plate forms a back suction channel. A flow guiding component is provided at one end of the back suction channel near the micro-nozzle, and a negative pressure generating device is externally connected to the other end. The flow guiding component is in contact with the micro-nozzle and is used to guide the liquid flowing out of the micro-nozzle to the back suction channel.

[0006] This application uses a back suction plate on the side of the micro-printer array and a negative pressure guide component to guide the liquid flowing out of the micro-printer to the back suction channel. The back suction channel is connected to a liquid recovery device to avoid the possibility of low-viscosity ink leaking from the micro-printer and contaminating the equipment.

[0007] Preferably, the back suction plate has a slot on the side near the micro nozzle, the slot is connected to the back suction channel, the flow guiding component is partially disposed in the slot, and the other part is in contact with the micro nozzle, so that the liquid flowing out of the micro nozzle can flow into the back suction channel along the flow guiding component.

[0008] Preferably, the flow guiding assembly includes a flow guiding plate and a plurality of flow guiding strips formed on the side of the flow guiding plate near the micro nozzle, the flow guiding strips being correspondingly arranged with the micro nozzle and the flow guiding strips being in contact with the outer wall of the micro nozzle.

[0009] Preferably, the guide strip has a back-suction slit along its length. The back-suction slit is a long, hollow structure and is connected to the back-suction channel. The capillary effect of the back-suction slit guides leaked ink to the guide plate, where it is back-suctioned under negative pressure through the main back-suction channel, preventing low-viscosity ink from leaking from the printhead and contaminating the equipment.

[0010] Preferably, a nozzle limiting hole is formed at the end of the back suction slit near the micro nozzle, and the shape of the nozzle limiting hole is adapted to the size of the micro nozzle.

[0011] More preferably, the surface of the guide plate is hydrophilic.

[0012] Preferably, a baffle is provided at the bottom of the guide vane that does not contact the micro-nozzle. The baffle is used to guide the direction of the back-suction airflow, minimize the airflow generated by the back-suction negative pressure near the micro-nozzle, reduce the impact of the back-suction airflow on the temperature of the micro-nozzle, and thus improve the flow stability of the micro-nozzle.

[0013] Preferably, the slot is inclined upward in a direction away from the micro-nozzle; the flow guiding assembly further includes a limiting groove horizontally disposed at the end of the slot and a locking member passing through the limiting groove, the end of the limiting groove near the flow guiding plate extends vertically upward to form an abutment surface, the abutment surface abuts against the ends of the flow guiding plate and the baffle; the locking member is used to apply a locking force to the contact surface between the flow guiding plate and the baffle and the slot to prevent the flow guiding plate and the baffle from falling out of the slot.

[0014] Preferably, the array-type multi-nozzle tail liquid back suction device further includes a nozzle mounting plate disposed above the back suction plate, and the micro-nozzle is mounted on the nozzle mounting plate; the back suction channel is formed on the top surface of the back suction plate.

[0015] Preferably, a back suction sealing gasket is provided between the top surface of the back suction plate and the bottom surface of the nozzle mounting plate. The back suction sealing gasket is used to seal the back suction channel on the top surface of the back suction plate and to provide heat insulation, so as to prevent the back suction airflow from affecting the temperature stability of the array micro nozzle.

[0016] More preferably, the nozzle mounting plate is provided with a nozzle mounting hole, a top pressure groove, and a top pressure elastic element; the top pressure groove is perpendicular to the nozzle mounting hole and penetrates through the nozzle mounting plate, and the micro-nozzle is installed in the nozzle mounting hole; the top pressure groove partially intersects and overlaps with the nozzle mounting hole; the top pressure elastic element is installed in the top pressure groove in a compressed state to generate a top pressure that applies to the micro-nozzle and adheres to 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 element.

[0017] Preferably, the backflow channel includes a main backflow channel and a backflow branch channel that are interconnected. The backflow branch channel is distributed along one side close to the micro-nozzle array and is connected to the slot.

[0018] Preferably, the back-suction branch channel further includes several primary branch channels, which are distributed along one side close to the micro-nozzle array, and the branch channels are connected to the slot.

[0019] More preferably, the back-suction channel further includes an upper transverse channel and a lower transverse channel disposed along the side of the back-suction plate near the micro-nozzle array. The upper transverse channel is disposed on the top surface of the back-suction plate, and the lower transverse channel is disposed on the cross-section of the back-suction plate near the slot. Several through vertical channels are provided between the upper and lower transverse channels, and the upper transverse channel is connected to the primary branch channel. The back-suction plate adopts an upper and lower transverse channel design, which means that the micro-nozzle design is not limited to a linear arrangement. Even for a scheme in which multiple micro-nozzles are arranged in an alternating manner, rapid back-suction of leakage can be achieved, thus broadening the application range.

[0020] Preferably, the primary branch flow channel further includes several secondary branch flow channels, which are correspondingly arranged with each micro nozzle and are connected to the slot.

[0021] In the above technical solution of this application, by setting a multi-stage back suction channel, the pressure of the back suction negative pressure can be more evenly distributed to each micro nozzle, avoiding the impact of the back suction negative pressure on the micro nozzle, reducing the influence of the back suction negative pressure on the micro nozzle temperature, and improving the flow stability of the micro nozzle.

[0022] Preferably, the backflow channel is connected to a suction port, the suction port is provided with a suction connector, and the suction connector is connected to a negative pressure generating device.

[0023] As described above, the array-type multi-nozzle tail liquid back suction device of the present invention has the following beneficial effects:

[0024] (1) By setting a back suction plate on the side of the micro nozzle array, the liquid flowing out of the micro nozzle is guided to the back suction channel by the negative pressure using the flow guiding component. The back suction channel is connected to a liquid recovery device to avoid the possibility of low viscosity ink leaking out of the micro nozzle and contaminating the equipment.

[0025] (2) A back-suction slit is formed along the length of the guide strip. The capillary effect of the back-suction slit is used to guide the leaked ink to the guide plate and then back-suction through the back-suction main channel under negative pressure. This avoids the back-suction airflow directly blowing the micro printhead and the printed product, and minimizes the airflow generated by the back-suction negative pressure near the micro printhead. This reduces the influence of the back-suction airflow on the temperature of the micro printhead, thereby improving the flow stability of the micro printhead.

[0026] (3) A back-suction guide structure is used to guide the direction of the back-suction airflow, so that it is concentrated in the guide strip and the back-suction slit, thereby improving the back-suction effectiveness. Attached Figure Description

[0027] Figure 1 The diagram shows a three-dimensional structure of the array-type multi-nozzle tail liquid back suction device as shown in Example 1.

[0028] Figure 2 Displayed as Figure 1 A magnified view of a portion of point A in the middle.

[0029] Figure 3 Displayed as Figure 1 The front view.

[0030] Figure 4 Displayed as Figure 3 Sectional view at point AA.

[0031] Figure 5 Displayed as Figure 4 A magnified view of a section at point B in the middle.

[0032] Figure 6 Displayed as Figure 5 A magnified view of a section at point C.

[0033] Figure 7 The diagram shown is a schematic diagram of the back suction plate in Example 1.

[0034] Figure 8 Displayed as Figure 7 A magnified view of a section at point D.

[0035] Figure 9 The image shown is a bottom view of the suction plate in Example 1.

[0036] Figure 10 Displayed as Figure 9 A magnified view of a section at point E in the middle.

[0037] Figure 11 The diagram shows a three-dimensional structure of the array-type multi-nozzle tail liquid back suction device as shown in Example 2.

[0038] Figure 12 Displayed as Figure 11 A magnified view of a section at point F.

[0039] Figure 13 Displayed as Figure 11 The front view.

[0040] Figure 14 Displayed as Figure 13 Sectional view at point BB.

[0041] Figure 15 Displayed as Figure 14 A magnified view of a section at point G.

[0042] Figure 16 The diagram shown is a schematic diagram of the back suction plate in Example 2.

[0043] Figure 17 The diagram shown is a schematic diagram of the flow guide plate in Example 2.

[0044] Reference numerals: 1. Back suction plate, 11. Slot, 12. Guide plate, 121. Guide strip, 122. Back suction slit, 123. Nozzle limiting hole, 124. Converging hole, 13. Baffle, 14. Limiting groove, 141. Locking element, 142. Abutment surface, 15. Back suction main channel, 151. Back suction branch channel, 152. Branch channel, 153. Suction port, 154. Suction connector, 155. Secondary branch channel, 156. Upper horizontal channel, 157. Lower horizontal channel, 158. Vertical channel, 2. Micro nozzle, 3. Nozzle mounting plate, 31. Top pressure elastic element. Detailed Implementation

[0045] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0046] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Unless otherwise expressly specified and limited, the terms "connection," "fixed," and "set" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] Example 1

[0049] like Figure 1 As shown in the figure, this application provides an array-type multi-nozzle tail liquid back suction device, including a micro-nozzle array, a back suction plate 1 disposed on the side of the micro-nozzle array, and a nozzle mounting plate 3 disposed above the back suction plate. The micro-nozzle array includes a plurality of micro-nozzles 2 arranged in an array. The micro-nozzles are mounted on the nozzle mounting plate. The back suction plate forms a back suction channel on its top surface. A back suction sealing gasket is provided between the top surface of the back suction plate and the bottom surface of the nozzle mounting plate. The back suction sealing gasket is used to seal the back suction channel on the top surface of the back suction plate and to provide heat insulation, so as to prevent the back suction airflow from affecting the temperature stability of the array micro-nozzles.

[0050] The return suction channel is equipped with a flow guiding component at one end near the micro nozzle, and a negative pressure generating device is connected to the other end; the flow guiding component is in contact with the micro nozzle and is used to guide the liquid flowing out of the micro nozzle to the return suction channel.

[0051] like Figure 3 , Figure 4 and Figure 5As shown, the nozzle mounting plate 3 is provided with a nozzle mounting hole, a top pressure groove, and a top pressure elastic element 31; the top pressure groove is perpendicular to the nozzle mounting hole and penetrates through the nozzle mounting plate, and the micro-nozzle 2 is installed in the nozzle mounting hole; the top pressure groove and the nozzle mounting hole partially intersect and overlap; the top pressure elastic element is installed in the top pressure groove in a compressed state to generate a top pressure that adheres to the other side wall of the nozzle mounting hole on the micro-nozzle; the inner wall of the nozzle mounting hole away from the top pressure elastic element forms a V-shaped mounting surface, and high positioning accuracy and positional stability are obtained by finely adjusting the position of the micro-nozzle and fixing it with adhesive during installation.

[0052] like Figure 7 As shown, the back suction plate has a slot 11 on the side near the micro nozzle. The slot is inclined upward in the direction away from the micro nozzle. The slot is connected to the back suction channel. The flow guiding component is partially located in the slot and partially in contact with the micro nozzle. The liquid flowing out of the micro nozzle can flow into the back suction channel along the flow guiding component.

[0053] like Figure 2 and Figure 5 As shown, the flow guiding assembly includes a flow guiding plate 12 with a hydrophilic surface treatment, and several flow guiding strips 121 formed on the side of the flow guiding plate near the micro-nozzle. A baffle 13 is provided at the bottom of the part not in contact with the micro-nozzle. The baffle is used to guide the direction of the backflow airflow. The flow guiding strips are correspondingly arranged with the micro-nozzle, and the flow guiding strips are in contact with the outer wall of the micro-nozzle. Figure 8 As shown, the guide strip has a back suction slit 122 formed along its length. The back suction slit is a long, hollow structure. The back suction slit is connected to the back suction channel. A nozzle limiting hole 123 is formed at the end of the back suction slit near the micro nozzle. The shape of the nozzle limiting hole is adapted to the size of the micro nozzle.

[0054] like Figure 6 As shown, the limiting groove 14 is horizontally provided at the end of the slot. The end of the limiting groove near the guide plate extends vertically upward to form an abutment surface 142. The abutment surface abuts against the ends of the guide plate 12 and the baffle 13. The locking member 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 out of the slot.

[0055] like Figure 7 , Figure 9 and Figure 10As shown, the back suction channel includes a main back suction channel 15 and a back suction branch channel 151 that are interconnected. The back suction branch channel also includes several primary branch channels 152. The back suction branch channels are distributed along the side near the micro-nozzle array and are connected to the slot. The back suction plate also has an upper horizontal channel 156 and a lower horizontal channel 157 on the side near the micro-nozzle array. The upper horizontal channel is located on the top surface of the back suction plate, and the lower horizontal channel is located on the cross-section of the back suction plate near the slot. Several through vertical channels 158 are spaced between the upper and lower horizontal channels. The upper horizontal channel is connected to the primary branch channels. The main back suction channel is connected to a suction port, which has a suction connector connected to a negative pressure generating device.

[0056] Figure 5 The path of low-viscosity ink leaking from the micro-printer and then being drawn back upwards along the back-suction slit 122 of the guide strip 121 is given, combined with... Figure 7 and Figure 9 The ink leaking from the micro-printer is first sucked into the lower horizontal flow channel 157, then flows into the upper horizontal flow channel 156 along the vertical flow channel 158, and then flows into the primary branch flow channel 152. The ink in the primary branch flow channel 152 flows into the return suction branch flow channel 151, and the ink in the return suction branch flow channel 151 flows into the return suction main flow channel 15 and is discharged from the suction port.

[0057] The upper and lower cross-flow channels in the back suction plate of this embodiment can also achieve rapid back suction of leaks even with multiple micro-nozzles arranged in an alternating pattern, thus expanding the range of applications.

[0058] Example 2

[0059] like Figure 11 As shown in the figure, this application provides an array-type multi-nozzle tail liquid back suction device, including a micro-nozzle array, a back suction plate 1 disposed on the side of the micro-nozzle array, and a nozzle mounting plate 3 disposed above the back suction plate. The micro-nozzle array includes a plurality of micro-nozzles 2 arranged in an array. The micro-nozzles are mounted on the nozzle mounting plate. The back suction plate forms a back suction channel on its top surface. A back suction sealing gasket is provided between the top surface of the back suction plate and the bottom surface of the nozzle mounting plate. The back suction sealing gasket is used to seal the back suction channel on the top surface of the back suction plate and to provide heat insulation, so as to prevent the back suction airflow from affecting the temperature stability of the array micro-nozzles.

[0060] The return suction channel is equipped with a flow guiding component at one end near the micro nozzle, and a negative pressure generating device is connected to the other end; the flow guiding component is in contact with the micro nozzle and is used to guide the liquid flowing out of the micro nozzle to the return suction channel.

[0061] like Figure 13 and Figure 14As shown, the nozzle mounting plate 3 is provided with a nozzle mounting hole, a top pressure groove, and a top pressure elastic element 31; the top pressure groove is perpendicular to the nozzle mounting hole and penetrates the nozzle mounting plate, and the micro-nozzle 2 is installed in the nozzle mounting hole; the top pressure groove and the nozzle mounting hole partially intersect and overlap; the top pressure elastic element is installed in the top pressure groove in a compressed state to generate a top pressure that adheres to the other side wall of the nozzle mounting hole against the micro-nozzle; the inner wall of the nozzle mounting hole away from the top pressure elastic element forms a V-shaped mounting surface, and high positioning accuracy and positional stability are obtained by finely adjusting the position of the micro-nozzle and fixing it with adhesive during installation.

[0062] like Figure 16 As shown, the back suction plate has a slot 11 on the side near the micro nozzle. The slot is inclined upward in the direction away from the micro nozzle. The slot is connected to the back suction channel. The flow guiding component is partially located in the slot and partially in contact with the micro nozzle. The liquid flowing out of the micro nozzle can flow into the back suction channel along the flow guiding component.

[0063] like Figure 12 , Figure 14 , Figure 15 and Figure 17 As shown, the flow guiding assembly includes a flow guiding plate 12 with a hydrophilic surface treatment, several flow guiding strips 121 formed on the side of the flow guiding plate near the micro-nozzle, and a baffle 13 on the bottom surface of the flow guiding plate that does not contact the micro-nozzle. The baffle is used to guide the direction of the back-suction airflow. The flow guiding strips are correspondingly arranged with the micro-nozzle and are in contact with the outer wall of the micro-nozzle. A back-suction slit 122 is formed along the length of the flow guiding strip. The back-suction slit is a long, hollow structure and is connected to the back-suction flow channel. Figure 15 As shown, the end of the slot is provided with a limiting groove 14 and a locking member 141 that passes through the limiting groove. The end of the limiting groove near the guide plate extends vertically upward to form an abutment surface, which abuts against the ends of the guide plate and the baffle plate. 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.

[0064] like Figure 16 As shown, the backflow channel includes a main backflow channel 15 and a backflow branch channel 151 that are interconnected. The backflow branch channel also includes several primary branch channels 152, and the primary branch channels also include several secondary branch channels 155. The backflow branch channels are distributed along one side close to the micro-nozzle array, and the backflow branch channels are connected to the slots. Figure 17 As shown, a manifold 124 is formed at the end of the back-suction slit away from the micro-nozzle, and the manifold is connected to the secondary branch channel. Figure 14As shown, the back suction main flow channel 15 is connected to a suction port 153, and the suction port is provided with a suction connector 154, which is connected to a negative pressure generating device.

[0065] Combination Figure 14 , Figure 15 , Figure 16 and Figure 17 In this embodiment, the array-type multi-nozzle tail liquid back suction device first draws low-viscosity ink upward along the back suction slit of the guide strip to the confluence hole 124 after it leaks out from the micro-nozzle. Then it enters the secondary branch channel 155, then the primary branch channel 152, then the back suction branch channel 151, and finally the back suction main channel 15, and is discharged from the suction port 153.

[0066] In this embodiment, the secondary branch channels in the back suction plate correspond one-to-one with each micro nozzle, enabling precise back suction of liquid leaking from each micro nozzle.

[0067] In summary, this invention, by incorporating a back-suction plate on the side of the micro-printer array and utilizing negative pressure with a flow guiding component, directs the ink flowing from the micro-printer to the back-suction channel. An external ink recovery device connects to the back-suction channel, preventing low-viscosity ink leakage from the micro-printer and potential contamination of the equipment. A back-suction slit is formed along the length of the flow guide strip. The capillary effect of the back-suction slit guides leaked ink to the flow guide plate, which then re-suctions it through the main back-suction channel under negative pressure. This prevents the back-suction airflow from directly blowing on the micro-printer and the printed product, minimizing airflow near the micro-printer due to the negative pressure, and reducing the impact of the back-suction airflow on the micro-printer temperature, thereby improving the flow stability of the micro-printer. The back-suction guiding structure guides the direction of the back-suction airflow, concentrating it within the flow guide strip and back-suction slit, improving back-suction effectiveness. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial applicability.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An array-type multi-nozzle tail liquid back suction device, characterized in that, It includes a micro-nozzle array and a back suction plate (1) disposed on the side of the micro-nozzle array. The micro-nozzle array includes a plurality of micro-nozzles (2) arranged in an array. The back suction plate forms a back suction channel. One end of the back suction channel near the micro-nozzle is provided with a flow guiding component, and the other end is externally connected to a negative pressure generating device. The flow guiding component is in contact with the micro-nozzle and is used to guide the liquid flowing out of the micro-nozzle to the back suction channel. The back suction plate is provided with a slot (11) on the side near the micro nozzle. The slot is connected to the back suction channel. The flow guiding component is partially located in the slot and the other part is in contact with the micro nozzle. The liquid flowing out of the micro nozzle can flow into the back suction channel along the flow guiding component. The flow guiding component includes a flow guiding plate (12) and a plurality of flow guiding strips (121) formed on the side of the flow guiding plate near the micro nozzle. The flow guiding strips are arranged corresponding to the micro nozzle and are in contact with the outer wall of the micro nozzle.

2. The array-type multi-nozzle tail liquid back suction device according to claim 1, characterized in that: The guide strip has a back suction slit (122) formed along its length. The back suction slit is a long, hollow structure and is connected to the back suction channel.

3. The array-type multi-nozzle tail liquid back suction device according to claim 2, characterized in that: The end of the back suction slit near the micro nozzle is formed with a nozzle limiting hole (123), the shape of which is adapted to the size of the micro nozzle; the surface of the guide plate is hydrophilic.

4. The array-type multi-nozzle tail liquid back suction device according to claim 1, characterized in that: The bottom of the guide vane that does not contact the micro-nozzle is provided with a baffle (13), which is used to guide the direction of the back-suction airflow.

5. The array-type multi-nozzle tail liquid back suction device according to claim 4, characterized in that: The slot is inclined upward in a direction away from the micro nozzle; the flow guiding assembly also includes a limiting groove (14) horizontally disposed at the end of the slot and a locking member (141) penetrating the limiting groove. The end of the limiting groove near the flow guide plate extends vertically upward to form an abutment surface (142), which abuts against the ends of the flow guide plate and the baffle plate; the locking member is used to apply a locking force to the contact surface between the flow guide plate and the baffle plate and the slot to prevent the flow guide plate and the baffle plate from falling out of the slot.

6. The array-type multi-nozzle tail liquid back suction device according to claim 1, characterized in that: The array-type multi-nozzle tail liquid back suction device also includes a nozzle mounting plate (3) located above the back suction plate, and the micro nozzle is mounted on the nozzle mounting plate; the back suction channel is formed on the top surface of the back suction plate; a back suction sealing gasket is provided between the top surface of the back suction plate and the bottom surface of the nozzle mounting plate, and the back suction sealing gasket is used to seal the back suction channel on the top surface of the back suction plate and to provide heat insulation.

7. The array-type multi-nozzle tail liquid back suction device according to any one of claims 1 to 6, characterized in that: The backflow channel includes a main backflow channel (15) and a backflow branch channel (151) that are interconnected. The backflow branch channel is distributed along one side close to the micro-nozzle array and is connected to the slot.

8. The array-type multi-nozzle tail liquid back suction device according to claim 7, characterized in that: The backflow channel also includes several primary branch channels (152), which are distributed along one side close to the micro-nozzle array and are connected to the slot.

9. The array-type multi-nozzle tail liquid back suction device according to claim 8, characterized in that: The backflow channel also includes an upper horizontal flow channel (156) and a lower horizontal flow channel (157) located on the side of the backflow plate near the micro-nozzle array. The upper horizontal flow channel is located on the top surface of the backflow plate, and the lower horizontal flow channel is located on the cross-section of the backflow plate near the slot. Several through vertical flow channels (158) are provided between the upper and lower horizontal flow channels. The upper horizontal flow channel is connected to the primary branch flow channel.

10. The array-type multi-nozzle tail liquid back suction device according to claim 8, characterized in that: The primary branch flow channel also includes several secondary branch flow channels (155), which are configured corresponding to each micro nozzle and are connected to the slot.

11. The array-type multi-nozzle tail liquid back suction device according to claim 7, characterized in that: The backflow channel is connected to a suction port (153), and the suction port is provided with a suction connector (154), which is connected to a negative pressure generating device.

Images