A spray-printing measurement integrated electrospray printing head for complex curved surfaces and a method of using the same

Abstract

The application discloses a kind of suitable for complex surface printing-measuring integration electroblotting head and use method, belong to advanced manufacturing technology field, including liquid supply printing module, ranging module, electric control module, displacement adjustment module. By ranging module real-time measurement printing height, the height measured is fed back to machine tool, adjust printing height of nozzle to appropriate range, by gas supply device suitable air pressure is applied to printing module, while starting electric control module applies suitable waveform and amplitude voltage, to control printing height, air pressure and voltage etc. each parameter to adjust the line width of printing pattern, eliminate accumulation point, and cooperate machine tool movement and print the microstructure that meets use demand.The electroblotting head suitable for complex surface printing-measuring integration electroblotting head proposed in the application can realize high efficiency and high quality manufacturing of different material function structure, with high printing precision, line width stability is good, printing pattern accumulation point is small and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of advanced manufacturing technology, and particularly relates to a spray printing and measuring integrated electrospray printing head suitable for complex curved surfaces and a use method thereof. BACKGROUND

[0002] The basic principle of electrohydrodynamic printing technology is to apply an electric field between the nozzle and the substrate. When the electric field force exceeds the surface tension of the liquid, the liquid at the outlet of the nozzle forms a Taylor cone, and then generates a continuous jet and is deposited on the substrate. By continuously adjusting and optimizing the electric field strength, flow rate, distance between the nozzle and the substrate, and movement speed of the moving table, high-precision patterns and structures can be stably and efficiently printed on small electronic components, which are widely used in manufacturing various components of electronic devices, such as circuit boards, chips, sensors, etc.

[0003] In recent years, the use of electrohydrodynamic printing technology to manufacture curved surface electronic devices has attracted widespread attention. This technology is compatible with various printing slurries and can achieve efficient processing of microstructures on complex curved surfaces through printing path processing software. However, on complex curved surfaces, due to irregular changes in curvature and substrate topography, the printing height changes greatly, and the deposited microstructures are prone to defects such as uneven line width and broken lines, which seriously affect their performance. SUMMARY

[0004] The present application aims to solve one of the above problems of curvature change and irregular change of substrate topography in complex curved surface printing, and provides an improved integrated electrospray printing head and its use method, which can measure the height when printing microstructures and adjust the printing height according to the measured height data, to ensure the performance of the printed microstructures.

[0005] To achieve the above-mentioned purpose, some embodiments of the present application provide a complex curved surface-oriented spray printing and measuring integrated electrospray printing head, which is arranged on a machine tool and includes a liquid supply and printing module, a distance measuring module, an electric control module, and a displacement adjustment module. The liquid supply and printing module stores printing ink and is connected to a dispensing machine through an air pipe, and the dispensing machine applies air pressure to it. The distance measuring module is used to measure the height in real time during printing and feed the measured data back to the machine tool control system to control the machine tool to adjust the distance in the Z-axis. The electric control module is connected to a metal probe through a wire, and the metal probe contacts the metal nozzle in the liquid supply and printing module to apply current to the printing ink. The displacement adjustment module is coupled to the liquid supply and printing module and the distance measuring module to adjust the relative position relationship between the liquid supply and printing module and the distance measuring module.

[0006] In some embodiments, the liquid supply printing module comprises a liquid storage device, a nozzle fixing member and a nozzle; the liquid storage device is used to store the printing ink, and the bottom of the liquid storage device is connected to the nozzle through the nozzle fixing member; the nozzle fixing member has an axially arranged first chamber to accommodate and fix the nozzle, and has a radially arranged second chamber to accommodate and fix a metal probe; the nozzle is composed of a transition part and a needle tip, and the transition part is provided with a liquid guide passage for the printing ink to pass through, and is fixed in the interior of the nozzle fixing member.

[0007] In some embodiments, the distance measuring module comprises a laser emitting device, a laser receiving device, a data processing device and a data line interface; the laser emitting device is used to emit laser; the laser receiving device is used to receive reflected laser; the laser emitting device and the laser receiving device are respectively arranged on both sides of the nozzle, and are adjusted in combination with the displacement adjusting module, so that the laser measuring point and the nozzle needle tip are located on the same vertical line, wherein the laser measuring point is the center point of each functional structure pattern; the data processing device is arranged above the laser receiving device, and is connected with the laser emitting device and the laser receiving device, and is used to process and calculate the received signal; the distance measuring module data line interface is used to connect the data line and transmit data to the machine tool control system.

[0008] In some embodiments, the second chamber comprises a first radial cylindrical cavity for accommodating and fixing the metal probe; a second radial cylindrical cavity with a smaller diameter as a passage for the connecting wire of the metal probe; a third radial cylindrical cavity with a larger diameter, through which the wire is in communication with the electric control module; the connecting wire of the metal probe is in contact with the nozzle made of metal material to realize conduction, and the nozzle fixing member is made of insulating and high-temperature resistant material.

[0009] In some embodiments, the displacement adjustment module comprises a horizontal convex slot, a concave slot, a square slot, a counterbore, a height adjustment slider, an L-shaped connecting plate, an XYZ three-axis small displacement holder, a connecting plate, a first horizontal adjustment slider, a second horizontal adjustment slider, and a third horizontal adjustment slider; the height adjustment slider is connected to the vertical part of the L-shaped connecting plate, the horizontal part of the L-shaped connecting plate is connected to the top surface of the XYZ three-axis small displacement holder, the bottom surface of the XYZ three-axis small displacement holder is connected to the connecting plate, the connecting plate is connected to the top end of the nozzle fixing part, the nozzle fixing part is built-in with a nozzle, and the coordinates of the nozzle needle tip are adjusted through the XYZ three-axis small displacement holder; the square slot is used to accommodate the height adjustment slider and is fixed on the back of the box; the first horizontal adjustment slider and the second horizontal adjustment slider are convex and embedded in the convex slot on the box, the convex slot acts as a slide to limit the movement of the slider in the YZ direction, and the third horizontal adjustment slider is concave and embedded in the concave slot on the box; the first horizontal adjustment slider, the second horizontal adjustment slider, and the third horizontal adjustment slider are all provided with threaded holes in the horizontal direction for connecting and fixing the laser ranging module, the first horizontal adjustment slider, the second horizontal adjustment slider, and the third horizontal adjustment slider drive the laser ranging module to move in the X-axis direction, thereby driving the laser ranging point to move and achieving rough alignment of the ranging point and the nozzle needle tip, and after alignment, the screws are tightened for fixation; the XYZ three-axis small displacement holder is used to accurately align the laser point and the nozzle needle tip so that their XY coordinates are consistent; the connecting plate is provided with a rectangular through hole at one end for the needle tube to pass through.

[0010] In some embodiments, the nozzle fixing part comprises a first axial cylindrical cavity, a second axial cylindrical cavity, a third axial cylindrical cavity, a fourth axial cylindrical cavity, a fifth axial cylindrical cavity, and a sixth axial cylindrical cavity arranged from top to bottom; the first axial cylindrical cavity has a larger diameter and is gap-fitted with the needle tube; the second axial cylindrical cavity is gap-fitted with the threaded part of the needle tube, in the second axial cylindrical cavity, the needle tube is connected to the first adapter segment of the nozzle through tube threads and achieves sealing; the third axial cylindrical cavity has a smaller diameter than the diameters of the second axial cylindrical cavity and the fourth axial cylindrical cavity, for example, only allowing the first adapter segment of the nozzle to pass through; the fourth axial cylindrical cavity is in interference fit with the second adapter segment to avoid position changes of the nozzle caused by the fitting gap; the fifth axial cylindrical cavity has a smaller diameter than the maximum diameter of the fourth axial cylindrical cavity, and the fifth axial cylindrical cavity is fitted with the third adapter segment of the nozzle; the metal probe contacts the third adapter segment of the nozzle to achieve electrical conduction; the sixth axial cylindrical cavity is fitted with the fourth adapter segment of the nozzle.

[0011] In some embodiments, the nozzle fixing member is made of nylon with glass fiber, and has a second cavity for fixing the metal probe and a first cavity for fixing the nozzle, and the adapter part of the nozzle is connected with the needle tip by screw thread.

[0012] In some embodiments, the needle tip is replaceable, and the fourth adapter part has a pipe thread inside for matching with the pipe thread of the connecting end of the needle tip.

[0013] In some embodiments, the complex surface-oriented integrated printing and measuring electro-chemical printing head comprises a box, a large cover plate and a small cover plate, wherein the large cover plate is connected with the box, the left end of the small cover plate is rotatably connected with the box, and the right end is locked by screws, and the box is internally arranged with the liquid supply printing module, the distance measuring module, the electric control module and the displacement adjustment module.

[0014] Some embodiments of the present application provide a method for using the complex surface-oriented integrated printing and measuring electro-chemical printing head, which comprises the following steps: selecting a nozzle needle tip with a proper caliber, assembling the nozzle, embedding the metal probe in the nozzle fixing member and leading the wire out, connecting the metal probe wire to the circuit of the electric control module to form a conductive path in an open circuit state, adjusting the height of the needle tip, the XY coordinates of the needle tip and the laser point by adjusting the height adjustment slider, the Y-axis direction counterbore slot hole of the L-shaped connecting plate, the first, second and third horizontal adjustment sliders, and then accurately adjusting the height of the needle tip and accurately aligning the XY coordinates of the needle tip and the laser point by using the XYZ three-axis small displacement holder, filling the needle tube with printing ink and connecting it to the air pipe adapter, connecting the air pipe to the air pipe adapter, connecting the air pipe to the glue dispenser, connecting the laser distance measuring module to the machine tool control system through the data line interface to form a data transmission path, and connecting the aviation plug to the electric signal function generator through the wire, covering and fixing the cover plate, operating the machine tool, setting the printing height and the laser distance measuring height, running the program, adjusting the machine tool to the laser distance measuring height, aligning the laser point to the distance measuring point of the printing pattern, and then lowering the Z-axis to the printing height according to the measured height data to start the printing work.

[0015] The complex surface-oriented integrated printing and measuring electro-chemical printing head provided by the present application can measure the height before printing the microstructure, record the height change data of the printing path of the substrate, adjust the printing height according to the measurement data, eliminate the defects caused by the height change, and improve the performance of the microstructure.

[0016] The beneficial effects of the present application include: first, the present application proposes a complex surface-oriented printing-measuring integrated electrospray printing head, which solves the problem of uneven line width and broken lines caused by height change, curvature change and irregular change of substrate topography in the complex surface printing process, improves the performance of complex surface electrofluidic printing microstructure, improves the automation level of the printing process, and realizes high resolution and high consistency of the printing manufacturing. Second, the present application designs a new type of electrospray printing head, which is installed on a three-axis displacement mechanism to realize the rapid and stable alignment of the needle tip of the printing head and the laser ranging point, realize the rapid connection of ranging and printing, and save a lot of time by moving the printing head to the printing position for printing after each ranging, so as to realize high-efficiency printing manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A schematic diagram of the complex surface-oriented printing-measuring integrated electrospray printing head according to the embodiment of the present application.

[0018] Figure 2 The internal structure of the electrospray printing head according to the embodiment of the present application.

[0019] Figure 3 The front view of the position adjustment module device structure according to the embodiment of the present application.

[0020] Figure 4 The rear view of the position adjustment module structure according to the embodiment of the present application.

[0021] Figure 5 The installation position schematic diagram of the electrospray printing head on the machine tool according to the embodiment of the present application.

[0022] Figure 6a The structure schematic diagram of the part of the printing head fixing member for fixing the printing head and the metal probe according to the embodiment of the present application.

[0023] Figure 6b The side view of Figure 6a The section view along the BB plane.

[0024] Figure 7a The structure schematic diagram of another part of the printing head fixing member according to the embodiment of the present application.

[0025] Figure 7b The side view of Figure 7a

[0026] Figure 8 The structure schematic diagram of the printing head according to the embodiment of the present application.

[0027] Figure 9 The assembly schematic diagram of the two parts of the printing head fixing member and the printing head according to the embodiment of the present application.​

[0028] In the figure: 1 liquid storage device, 2 data processing device, 3 nozzle fixing part, 4 laser receiver, 5 nozzle, 6 laser emitter, 7 electric control module, 8 position adjustment module, 9 aviation plug, 10 air pipe adapter, 11 distance measuring module data line interface, 81 M1.6 countersunk slot, 82 L-shaped connecting plate, 83 XYZ three-axis small displacement cloud platform, 84 connecting plate, 85 first horizontal adjustment slider, 86 second horizontal adjustment slider, 87 third horizontal adjustment slider, 88 height adjustment slider; 89 square sliding groove, 810 "convex" sliding groove, 811 "concave" sliding groove, 31 cylindrical cavity, 32 cylindrical cavity, 33 cylindrical cavity, 34 cylindrical cavity, 35 cylindrical cavity, 36 cylindrical cavity, 37 cylindrical cavity, 38 middle cylindrical cavity, 39 cylindrical cavity, 51 cylindrical structure, 52 cylindrical structure, 53 cylindrical structure, 54 cylindrical structure, 55 replaceable needle tip. DETAILED DESCRIPTION

[0029] The application will be described in detail below in combination with the technical solutions and the drawings.

[0030] A spray printing and measuring integrated electro-spray printing head 100 for complex surfaces is proposed, which is arranged on a machine tool 200 and includes a liquid supply and printing module, a distance measuring module, an electric control module 7, and a position adjustment module 8. The liquid supply and printing module is configured to store printing ink and is connected to an air pipe to allow a dispensing machine to apply appropriate air pressure thereto. The distance measuring module is configured to measure the printing height and feed the measured data to the machine tool control system to control the machine tool to adjust the axis distance. The electric control module 7 is configured to connect a metal probe through a wire, and the metal probe contacts the nozzle 5 made of metal in the liquid supply and printing module, so as to apply current to the printing ink. The position adjustment module 8 serves to connect and fix the liquid supply and printing module, the distance measuring module, and the electric control module 7, and adjust the relative position relationship of the modules.

[0031] Specifically, the overall shape of the measuring and printing integrated electro-spray printing head 100 according to the embodiment of the application is as shown in Figure 1 The box body 101, the large cover plate 102, and the small cover plate 103 are connected by M3 screws, the left end of the small cover plate 103 is connected to the box body 101 by a cylindrical pin, and the right end is locked by M2 screws. The box body 101 is internally arranged with the above-mentioned liquid supply and printing module, distance measuring module, electric control module 7, and position adjustment module 8.

[0032] As Figure 2As shown, the liquid supply printing module includes a liquid storage device 1, a nozzle fixing member 3, a nozzle 5 and a gas pipe adapter 10. Specifically, the liquid storage device 1 is a cylindrical cavity structure for storing printing ink, and the bottom thereof is provided with a thread for connecting the nozzle 5 through the nozzle fixing member 3 to form a sealed connection for sealing. As shown Figure 6a 、 Figure 6b As shown, the nozzle fixing member 3 has an axial first cavity inside for accommodating and fixing the nozzle 5, and the first cavity is provided with six axial cylindrical cavities 31, 32, 33, 34, 35 and 36 with different diameters. The nozzle fixing member 3 also has a radial second cavity inside for accommodating and fixing a metal probe, and the second cavity can include three first, second and third radial cylindrical cavities 37, 38 and 39 with different inner diameters. The first radial cylindrical cavity 37 accommodates and fixes the metal probe, the second radial cylindrical cavity 38 is located between the first and third radial cylindrical cavities 37 and 39, and has a smaller diameter than the other two radial cylindrical cavities, serving as a passage for the wire connecting the metal probe, for example, the diameter thereof can be set to just accommodate the wire passing through. The wire passes through the third radial cylindrical cavity 39 to access the control module.

[0033] The metal probe is in contact with the nozzle 5 to realize electrical conduction. In order to realize safe electricity, the nozzle fixing member 3 can be made of an insulating and high-temperature resistant material. As shown Figure 8 The nozzle 5 is composed of a connecting portion and a needle tip: the connecting portion is composed of four cylindrical structure connecting segments 51-54 with different diameters, for example, the four hollow cylindrical structure connecting segments 51-54 of the connecting portion from top to bottom are: the first connecting segment 51, the second connecting segment 52, the third connecting segment 53 and the fourth connecting segment 54. The connecting portion is provided with a liquid guide passage for the printing ink to pass through, and is fixed inside the nozzle fixing member 3. The needle tip 55 can be a replaceable structure, and is fixed by screwing into the fourth connecting segment 54 to form a sealed connection while playing a sealing role. As mentioned above, the needle tip 55 can be replaced with different diameters, commonly used are 50 μm, 75 μm and 100 μm inner diameter nozzles, suitable for printing microstructures with different line width requirements; the gas pipe adapter 10 is a standard part.

[0034] As shown Figure 6a 、 Figure 6b 、 Figure 9As shown, the nozzle fixing member 3 fixes the nozzle 5, and the specific structure of the nozzle fixing member 3 and the matching mode thereof with the nozzle 5 can be specifically configured as follows: the six cavities of the first cavity of the nozzle fixing member 3 are sequentially from top to bottom: the first axial cylindrical cavity 31, the second axial cylindrical cavity 32, the third axial cylindrical cavity 33, the fourth axial cylindrical cavity 34, the fifth axial cylindrical cavity 35, and the sixth axial cylindrical cavity 36. The first axial cylindrical cavity 31 has a larger diameter and is in clearance fit with the 5cc needle tube; the second axial cylindrical cavity 32 is in clearance fit with the threaded part of the 5cc needle tube, and in the second axial cylindrical cavity 32, the 5cc needle tube is connected with the first adapter section 51 of the nozzle 5 through pipe threads and sealing is realized; the third axial cylindrical cavity 33 has a smaller diameter than the diameters of the second axial cylindrical cavity 32 and the fourth axial cylindrical cavity 34, for example, only allowing the first adapter section 51 of the nozzle 5 to pass; the fourth axial cylindrical cavity 34 is in interference fit with the second adapter section 52, avoiding the position change of the nozzle 5 caused by the matching clearance; the fifth axial cylindrical cavity 35 has a smaller diameter than the maximum diameter of the fourth axial cylindrical cavity 34, and the fifth axial cylindrical cavity 35 is matched with the third adapter section 53 of the nozzle 5. The metal probe contacts the third adapter section 53 of the nozzle 5 to realize electric conduction; the sixth axial cylindrical cavity 36 is matched with the fourth adapter section 54 of the nozzle 5. The nozzle fixing member 3 is formed by two split components, for example, the first split component is as shown in Figure 6a 、 Figure 6b and the second split component is as shown in Figure 7a 、 Figure 7b The two components can be completely the same, or the difference between the two components is that one of the components is provided with the fixing structure of the metal probe, and the other component is not provided with the fixing structure. The two components can be connected through the through holes 310 and 311 and M2 bolts and nuts.

[0035] As shown in Figure 2As shown, the distance measuring module comprises a laser emitting device 6, a laser receiving device 4, a data processing device 2 and a data interface device such as a data line interface 11. Specifically, the laser emitting device 6 is internally provided with a laser, a modulator and an optical system for emitting laser. The laser receiving device 4 is internally provided with a mirror, a photodiode and a filter for receiving reflected laser. The laser beam emitted by the laser emitting device 6 can have an angle of 45 degrees with the horizontal plane. The laser emitting device 6 and the laser receiving device 4 are respectively arranged on the two sides of the nozzle 5. The laser emitting device 6 emits a laser beam at an angle of 45 degrees, and the laser beam is reflected on the substrate to be received by the laser receiving device 4. The laser spot is located on the substrate. This separate arrangement of the laser emitting device and the laser receiving device leaves a certain space between the two devices, which can accommodate the nozzle 5. In combination with the position adjustment module 8 for adjusting the position of the nozzle 5, the laser measuring point and the needle tip of the nozzle can be located on the same vertical line, wherein the laser measuring point is the center point of each microstructure pattern on the substrate. After distance measurement, only the vertical position of the nozzle 5, i.e. the position of the Z axis, is lowered, so that the printing work can be quickly carried out, the interval time between distance measurement and printing is shortened, and the printing efficiency is improved. If the laser measuring point and the needle tip of the nozzle cannot be aligned, the needle tip needs to be aligned with the laser measuring point by moving the machine tool shaft after each measurement, which will consume a lot of time when printing on a large area curved surface. The data processing device 2 is arranged above the laser receiving device and is internally provided with a microprocessor, a digital signal processor and a memory. The data processing device 2 is connected with the laser emitting device 6 and the laser receiving device 4 for processing and calculating the received signals. The data line interface 11 is a standard part for connecting data lines and transmitting data to the machine tool control system.

[0036] As shown in Figure 3 , Figure 4 As shown in Figure 5As shown, the positive direction of the X-axis is defined as parallel to the paper surface to the right, the positive direction of the Y-axis is defined as perpendicular to the paper surface to the outside, and the positive direction of the Z-axis is defined as parallel to the paper surface to the top. The height adjustment slider 88 is connected to the vertical part of the L-shaped connecting plate 82, the horizontal part of the L-shaped connecting plate 82 is connected to the top surface of the XYZ three-axis small displacement holder 83 through M2 internal hexagonal screws, the bottom surface of the XYZ three-axis small displacement holder 83 is connected to the horizontal connecting plate 84 through M2 internal hexagonal screws, and the horizontal connecting plate 84 is connected to the top end of the nozzle fixing piece 3 through M1.6 internal hexagonal screws. The nozzle fixing piece 3 cooperates with the nozzle 5, so that the coordinates of the needle tip 55 of the nozzle 5 can be adjusted through the XYZ three-axis small displacement holder 83. The square sliding groove 89 is gap-fitted with the height adjustment slider 88 and is fixed to the back of the box body 101 through four M1.6 screws. The M1.6 countersunk hole 81 is a slide for the four M1.6 bolts that fix the height adjustment slider 88. The longer square sliding groove 89 and the countersunk hole 81 can ensure that the height adjustment slider 88 has sufficient height adjustment range. The first horizontal adjustment slider 85 and the second horizontal adjustment slider 86 are "convex" and are embedded in the convex sliding groove 810 on the box body. The convex sliding groove 810 functions as a slide to limit the movement of the sliders in the YZ direction. The third horizontal adjustment slider 87 is "concave" and is embedded in the concave sliding groove 811 on the box body 101. Each of the three horizontal adjustment sliders is provided with an M4 threaded hole, and a laser distance measuring module is connected and fixed through M4 bolts. The laser distance measuring module has three M4 bolt through holes. The three horizontal sliders 85, 86 and 87 can drive the laser distance measuring module to move in the X-axis direction, thereby driving the laser distance measuring point to move and achieve rough alignment of the laser distance measuring point with the needle tip 55. After alignment, the screws can be tightened for fixation. The XYZ three-axis small displacement holder 83 is used to accurately align the laser distance measuring point with the needle tip 55 of the nozzle, so that the XY coordinates of the two are consistent. The horizontal connecting plate 84 is provided with a through hole at one end for a 5cc needle tube to pass through.

[0037] The L-shaped connecting plate 82 can be a 90° bent plate, the vertical part of which is connected to the height adjustment slider 88 through four M1.6 internal hexagonal screws, and the horizontal part of which is connected to the XYZ three-axis small displacement holder 83 through four M2 internal hexagonal screws. The horizontal part is provided with M2 countersunk grooves in the Y-axis direction for rough adjustment of the Y-axis position of the XYZ three-axis small displacement holder 83.

[0038] The XYZ three-axis small displacement holder 83 can be a traditional three-axis displacement holder, which can be composed of a base, an XYZ axis system, a slider, a handle, a limit switch and a fastener, wherein the base is the foundation of the entire holder, providing stable support, the XYZ axis system is the core part of the holder, composed of three mutually perpendicular slide rails, each slide rail corresponds to an axis (X, Y, Z), the slider is installed on the slide rail and can be moved along the slide rail by manual operation, the handle is used for manual operation of the slider movement, provided with a locking mechanism to fix the position of the slider, the limit switch limits the movement range of the slider on each axis to prevent exceeding the designed range, and the fastener is mainly a screw used to fix each part.

[0039] The spray head fixing member 3 can be made of nylon with glass fiber material, which increases its strength while ensuring insulation, and is internally provided with a second cavity for fixing the metal probe and a first cavity for fixing the spray head 5. The adapter part of the spray head 5 is connected with the needle tip 55 by screw thread connection to ensure its sealing property.

[0040] The distance measuring module can be configured to measure the height in real time during the printing process and adjust the printing height in time according to the height change.

[0041] The laser beam emitted by the laser emitting device 6 has an inclination angle of 45 degrees with the horizontal plane, and the laser emitting device 6 and the laser receiving device 4 are respectively arranged on the two sides of the spray head 5 and are position-adjusted by the position adjustment module, so that the laser ranging point and the needle tip 55 of the spray head 5 are located on the same vertical line, and the horizontal coordinates of the laser ranging point and the needle tip 55 are consistent, so as to shorten the time interval of the connection of the two working steps of ranging and printing, and improve the printing efficiency.

[0042] The electric control module 7 functions as a power-on and protection circuit and is connected with the metal probe through wires. The electric control module 7 is internally provided with three protection circuits, namely a short-circuit protection circuit, an over-voltage protection circuit and an anti-reverse connection protection circuit. The aviation plug 9 is a standard part for connecting external power supply. The short-circuit protection circuit adopts a miniature circuit breaker, which functions to automatically cut off the power supply or reduce the output power of the circuit when abnormal conditions such as overcurrent and short circuit occur in the circuit, so as to protect the circuit and related equipment from being damaged.

[0043] The overvoltage protection circuit is composed of a pressure sensitive resistor, which is a special resistor that sharply reduces its resistance when the voltage rises to a certain critical value, and diverts the voltage to the ground, and its function is to automatically take measures to protect the circuit and its related equipment from damage when overvoltage occurs in the circuit.

[0044] The application provides a complex surface-oriented printing and measuring integrated electrospray printing head, and an assembly diagram is shown in the figure. Figure 1 The electrospray printing head comprises a liquid storage device 1, a data processing device 2, a printing head fixing part 3, a laser receiver 4, a printing head 5, a laser emitter 6, an electric control module 7, a position adjusting module 8, an aviation plug 9, a gas pipe adapter 10 and a data line interface 11. The position adjusting module 8 comprises M1.6 countersunk slot holes 81, height adjusting sliding blocks 88 on a back plate, L-shaped connecting plates 82, XYZ three-axis small displacement gimbals 83, horizontal connecting plates 84 and horizontal adjusting sliding blocks 85, 86 and 87.

[0045] The liquid storage device 1 is connected with the printing head 5 through threads and plays a sealing role, and the printing head 5 is fixed in the printing head fixing part 3, and the two are in interference fit, thereby limiting the movement and rotation of the printing head 5. The liquid storage device 1, the printing head fixing part 3 and the printing head 5 constitute a liquid supply printing module, the liquid supply printing module is connected with the printing head fixing part 3 through M1.6 bolts and is fixed on the horizontal connecting plate 84, and in this way, the liquid supply printing module is connected with the XYZ three-axis small displacement gimbal 83 in the position adjusting module 8, the XYZ three-axis small displacement gimbal has the function of fine adjustment of the position of a needle tip, and is connected with the height adjusting sliding blocks 88 on the back plate through the L-shaped connecting plates 82, and the connection mode is that the height adjusting sliding blocks 88 are fixed on the tracks of the M1.6 countersunk slot holes 81 through M1.6 bolts.

[0046] The distance measuring module is connected with the horizontal adjusting sliding blocks 85, 86 and 87 through M4 bolts, and thus the distance measuring module and the liquid supply printing module 100 can be relatively position adjusted through the position adjusting module 8, that is, the laser ranging point and the needle tip 55 of the printing head 5 are aligned, the needle tip 55 is directly above the laser ranging point, the distance can be measured and printing can be performed at the same time, and the function of timely adjusting the printing height is realized.

[0047] The electric control module 7 is connected with a metal probe at one end of an electric wire, and the metal probe is in contact with the printing head 5 in the printing head fixing part 3 to realize an electrically conductive path. Figure 5As shown, the electric control module 7 can also act as a power-on and protection circuit, with three protection circuits built-in, namely short-circuit protection circuit, over-voltage protection circuit and reverse connection protection circuit, to ensure the safety of electricity during printing.

[0048] A method for using a spray printing and measuring integrated electrospray printing head for complex curved surfaces, comprising the following steps:

[0049] First, select the appropriate caliber needle tip 55 to assemble the nozzle 5, and embed the metal probe in the nozzle fixing part 3 and lead out the wire, then assemble the nozzle 5 and the nozzle fixing part 3, after assembly, use M2 internal hexagonal screw and M2 nut to connect and fix the two parts of the nozzle fixing part 3, then connect the bottom end of the XYZ three-axis small displacement cloud platform 83 through M2 screw, then connect the horizontal part of the L-shaped connecting plate 82 at the top of the XYZ three-axis small displacement cloud platform 83 through M2 internal hexagonal screw, then connect the vertical part of the L-shaped connecting plate and the height adjustment slider 88 through M1.6 internal hexagonal screw, then embed the height adjustment slider 88 in the square sliding groove 89, and connect and fix it with the screw hole of the height adjustment slider 88 through M1.6 countersunk hole 81 and M1.6 internal hexagonal screw; connect and fix the first horizontal adjustment slider 85, the second horizontal adjustment slider 86 and the third horizontal adjustment slider 87 through the through hole of the laser ranging module and the screw hole of the first horizontal adjustment slider 85, the second horizontal adjustment slider 86 and the third horizontal adjustment slider 87; use screws to fix the electric control module on the box, connect the metal probe wire to the circuit of the electric control module to form a conductive path, which should be kept in open circuit state at this time;

[0050] Secondly, after the above work is completed, the height of the needle tip is adjusted by adjusting the height adjustment slider 88, the M2 countersunk hole of the Y-axis direction of the L-shaped connecting plate 82, the first horizontal adjustment slider 85, the second horizontal adjustment slider 86 and the third horizontal adjustment slider 87, and the XY coordinates of the needle tip 55 and the laser point are roughly adjusted, then the XYZ three-axis small displacement cloud platform 83 is used to accurately adjust the height of the needle tip, and the XY coordinates of the needle tip 55 and the laser point are accurately aligned. Then fill the 5cc needle tube with printing ink and connect it to the air pipe adapter, connect the air pipe through the air pipe adapter, and connect the air pipe to the glue dispenser; connect the laser ranging module to the machine tool control system through the data line interface 11 to form a data transmission path, and connect the electric signal transmission interface 9 to the electric signal function generator through the wire.

[0051] First step, select the appropriate caliber of the needle tip, assemble the spray head 5, in the spray head fixing piece 3 built-in metal probe and lead wire, then the spray head 5 and spray head fixing piece 3 are assembled, after assembly, use M2 internal hexagonal screw and M2 nut to connect and fix the two parts of the spray head fixing piece 3, then connect the bottom end of the XYZ three-axis small displacement cloud platform 83 through M2 screw, then connect the top end of the XYZ three-axis small displacement cloud platform 83 with the horizontal part of the L-shaped connecting plate 82 through M2 internal hexagonal screw, then connect the vertical part of the L-shaped connecting plate with the height adjustment slider 88 through M1.6 internal hexagonal screw, then embed the height adjustment slider 88 in the square sliding groove 89, and connect and fix it with the threaded hole of the height adjustment slider 88 through M1.6 countersunk groove 81 and four M1.6 internal hexagonal screws; connect and fix the threaded holes of the first, second and third horizontal adjustment sliders 85, 86 and 87 with the through hole of the laser ranging module through M4 bolts; use screws to fix the electric control module on the box, connect the metal probe wire to the circuit of the electric control module to form a conductive path, which should be kept in open circuit state at this time.

[0052] Second step, after the above work is completed, the height of the needle tip is adjusted by adjusting the height adjustment slider 88, the M2 countersunk groove of the Y-axis direction of the L-shaped connecting plate 82, the first, second and third horizontal adjustment sliders 85, 86 and 87, and the XY coordinates of the needle tip and the laser point are roughly adjusted, and then the XYZ three-axis small displacement cloud platform 83 is used to accurately adjust the height of the needle tip, and the XY coordinates of the needle tip and the laser point are accurately aligned.

[0053] Third step, fill the 5cc needle tube with printing ink and connect it to the air pipe adapter, connect the air pipe through the air pipe adapter, and connect the air pipe to the glue dispenser; connect the laser ranging module to the machine tool control system through the data line interface 11 to form a data transmission path, and connect the aviation plug 9 with the electric signal function generator through the wire.

[0054] Finally, cover the cover plate and fix it, then operate the machine tool, set the printing height and the laser ranging height, run the program, the machine tool is adjusted to the laser ranging height, the laser point is aligned with the laser ranging point of the printing pattern at this time, the laser ranging point is generally located in the center of the printing pattern, after ranging, the machine tool directly drops Z axis to the printing height to start printing work.

[0055] The above-described embodiments only express the implementation of the present application, but cannot be interpreted as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. An electrostatic printing head with integrated printing and measurement for complex curved surfaces, characterized in that: The electrostatic printing head for complex curved surfaces is provided on a machine tool. The electrostatic printing head includes a liquid supply printing module, a distance measuring module, an electric control module (7), and a displacement adjustment module (8). The liquid supply printing module stores printing ink and is connected to a dispensing machine via an air pipe, and air pressure is applied to the dispensing machine via the dispensing machine. The distance measuring module is used to measure the height in real time during the printing process and feed the measured data back to the machine tool control system to control the machine tool to adjust the distance of the Z axis. The electric control module (7) is connected to a metal probe via a wire, and the metal probe contacts the metal nozzle (5) in the liquid supply printing module to apply current to the printing ink. The displacement adjustment module (8) is coupled to the liquid supply printing module and the distance measuring module to adjust the relative position relationship between the liquid supply printing module and the distance measuring module. The distance measuring module comprises a laser emitting device (6), a laser receiving device (4), a data processing device (2) and a data line interface (11); the laser emitting device (6) is used to emit laser light; the laser receiving device (4) is used to receive the reflected laser light, the laser emitting device (6) and the laser receiving device (4) are respectively placed on both sides of the nozzle (5), and then adjusted in combination with the displacement adjustment module (8) so that the laser ranging point and the nozzle needle tip are located on the same vertical line, wherein the laser ranging point is the center point of each functional structure figure; the data processing device (2) is connected to the laser emitting device (6) and the laser receiving device (4) and is used to process and calculate the received signal; the distance measuring module data line interface (11) is used to connect the data line to transmit the data to the machine tool control system.

2. The electrojet print head integrated with printing and measurement for complex curved surfaces according to claim 1, characterized in that: The liquid supply printing module comprises a liquid storage device (1), a nozzle fixing member (3) and a nozzle (5); the liquid storage device (1) is used to store the printing ink, and its bottom is connected to the nozzle (5) through the nozzle fixing member (3); the nozzle fixing member (3) has an axially arranged first chamber for accommodating and fixing the nozzle (5), and a radially arranged second chamber for accommodating and fixing a metal probe, and the nozzle (5) consists of a connecting part and a needle tip: the connecting part is provided with a liquid guide passage for the printing ink to pass through, and the liquid guide passage is fixed inside the nozzle fixing member (3).

3. The electrojet print head integrated with printing and measurement for complex curved surfaces according to claim 1, characterized in that: The data processing device (2) is placed above the laser receiving device.

4. The electrojet print head integrated with printing and measurement for complex curved surfaces according to claim 2, characterized in that: The second chamber includes a first radial cylindrical cavity (37) for accommodating and fixing the metal probe; a second radial cylindrical cavity (38) with a small diameter serves as a passage for a wire connected to the metal probe; a third radial cylindrical cavity (39) with a large diameter, and the wire passes through the third radial cylindrical cavity (39) to communicate with the electronic control module; the connecting wire of the metal probe contacts the nozzle (5) made of metal material to achieve electrical conductivity, and the nozzle fixing member (3) is made of insulating and high-temperature resistant material.

5. The electrojet print head integrated with printing and measurement for complex curved surfaces according to claim 4, characterized in that: The displacement adjustment module (8) includes a horizontal convex chute (810), a concave chute (811), a square chute (89), a countersunk slot (81), a height adjustment slider (88), an L-shaped connecting plate (82), an XYZ three-axis small displacement platform (83), a connecting plate (84), a first horizontal adjustment slider (85), a second horizontal adjustment slider (86), and a third horizontal adjustment slider (87); the height adjustment slider (88) is connected to the vertical portion of the L-shaped connecting plate (82), and the L-shaped connecting plate (84) is connected to the vertical portion of the L-shaped connecting plate (82). The horizontal portion of the connecting plate (82) is connected to the top surface of the XYZ three-axis small displacement platform (83), the bottom surface of the XYZ three-axis small displacement platform (83) is connected to the connecting plate (84), the connecting plate (84) is connected to the top of the nozzle fixing member (3), the nozzle fixing member (3) has a built-in nozzle (5), and the coordinates of the nozzle needle tip are adjusted by the XYZ three-axis small displacement platform (83); the square slide (89) is used to accommodate the height adjustment slider (88) and is fixed to the back of the box; the first horizontal adjustment slider (85 ), the second horizontal adjustment slider (86) is convex and is embedded in the convex slide groove (810) on the box body. The convex slide groove (810) serves as a slideway to limit the movement of the slider in the YZ direction. The third horizontal adjustment slider (87) is concave and is embedded in the concave slide groove (811) on the box body. The first horizontal adjustment slider (85), the second horizontal adjustment slider (86), and the third horizontal adjustment slider (87) are all provided with threaded holes in the horizontal direction for connecting and fixing the laser ranging module. The first horizontal adjustment slider (85), the second horizontal adjustment slider (86), and the third horizontal adjustment slider (87) drive the laser ranging module to move in the X-axis direction, thereby driving the laser ranging point to move, achieving a rough alignment between the ranging point and the nozzle needle tip, and tightening the screws to fix after alignment; the XYZ three-axis small displacement platform (83) is used to accurately align the laser point with the nozzle needle tip so that the XY coordinates of the two are consistent; the connecting plate (84) is provided with a rectangular through hole at one end for the needle tube to pass through.

6. The electrojet printing head integrated with printing and measurement for complex curved surfaces according to claim 5, characterized in that: The nozzle fixing member (3) comprises a first axial cylindrical cavity (31), a second axial cylindrical cavity (32), a third axial cylindrical cavity (33), a fourth axial cylindrical cavity (34), a fifth axial cylindrical cavity (35), and a sixth axial cylindrical cavity (36) which are arranged in sequence from top to bottom; the first axial cylindrical cavity (31) has a larger diameter and forms a clearance fit with the needle tube; the second axial cylindrical cavity (32) forms a clearance fit with the threaded portion of the needle tube, and in the second axial cylindrical cavity (32), the needle tube and the first transition section (51) of the nozzle (5) are connected via a pipe thread and sealed; the third The diameter of the axial cylindrical cavity (33) is smaller than the diameters of the second axial cylindrical cavity (32) and the fourth axial cylindrical cavity (34), and only the first transition section (51) of the nozzle (5) can pass through; the fourth axial cylindrical cavity (34) and the second transition section (52) are in an interference fit relationship, avoiding position changes of the nozzle (5) caused by the fit gap; the diameter of the fifth axial cylindrical cavity (35) is smaller than the maximum diameter of the fourth axial cylindrical cavity (34), and the fifth axial cylindrical cavity (35) forms a fit with the third transition section (53) of the nozzle (5); the metal probe contacts the third transition section (53) of the nozzle (5) to achieve electrical conduction; The sixth axial cylindrical cavity (36) cooperates with the fourth transition section (54) of the nozzle (5).

7. The electrojet printing head integrated with printing and measurement for complex curved surfaces according to claim 6, characterized in that: The nozzle fixing member (3) is made of nylon and glass fiber, and is provided with a second cavity for fixing the metal probe, which is used to fix the first cavity of the nozzle (5). The connecting part of the nozzle (5) and the needle tip (55) are connected by a thread.

8. The electrojet print head integrated with printing and measurement for complex curved surfaces according to claim 7, characterized in that: The needle tip (55) is a replaceable structure; a pipe thread is provided inside the fourth transition section (54) and matches the pipe thread of the connecting end of the needle tip (55).

9. The electrojet print head integrated with printing and measurement for complex curved surfaces according to claim 8, characterized in that: The appearance of the electrostatic printing head integrated with printing and measurement for complex curved surfaces is composed of a box body, a large cover plate and a small cover plate, wherein the large cover plate is connected to the box body, the left end of the small cover plate is a rotatable connection structure with the box body, and the right end is locked by a screw, and the liquid supply printing module, the distance measurement module, the electronic control module (7) and the displacement adjustment module (8) are arranged inside the box body.

10. A method for using the electrojet print head integrated with printing and measurement for complex curved surfaces according to any one of claims 5 to 9, characterized in that: The following steps are involved: Select a nozzle tip of appropriate caliber, assemble the nozzle (5), insert a metal probe into the nozzle fixture (3) and lead out the wire, connect the metal probe wire to the circuit of the electronic control module to form a conductive path, and maintain the circuit breaker state; The needle tip height and the XY coordinates of the needle tip and the laser point are roughly adjusted by adjusting the height adjustment slider (88), the Y-axis countersunk slot of the L-shaped connecting plate (82), the first horizontal adjustment slider (85), the second horizontal adjustment slider (86) and the third horizontal adjustment slider (87), and then the needle tip height is precisely adjusted using the XYZ three-axis small displacement platform (83), and the XY coordinates of the needle tip and the laser point are precisely aligned; Fill the needle with printing ink and connect it to the air tube adapter, connect the air tube through the air tube adapter, and connect the air tube to the dispensing machine; the laser distance measuring module is connected to the machine tool control system through the data line interface (11) to form a data transmission path, and the aviation plug (9) is connected to the electrical signal function generator through a wire; Close and secure the cover, operate the machine, set the printing height and laser ranging height, run the program, and adjust the machine to the laser ranging height. The laser point is now aligned with the ranging point of the printed pattern. After ranging, the machine directly lowers the Z axis to the printing height based on the measured height data to start printing.

Images