Injection type hole plugging high-temperature nozzle structure and horizontal injection type equipment

Abstract

According to the injection type hole plugging high-temperature nozzle structure and the horizontal injection type equipment, an air knife channel is of a conical structure which is continuously and gradually shrunk from top to bottom in the axis direction of a nozzle main body, so that high-temperature compressed air is sprayed out in a radial shape and collides and fuses with ink liquid drops; the ink droplets are cut and kept in a high-fluidity molten state, the viscosity of the ink droplets can be effectively reduced, the phenomenon of viscosity increase or solidification caused by cooling is avoided, in the hole plugging process, the ink droplets can evenly fill target holes, the risks of gaps and incomplete filling are reduced, and therefore the hole plugging quality and consistency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board production and manufacturing, and more specifically, to an injection-type plugging hole high-temperature nozzle structure and a horizontal injection-type device. Background Art

[0002] With the rapid development of the electronics industry, PCB (Printed Circuit Board) manufacturing technology has also been continuously progressing. In high-density interconnect (HDI) technology, the plugging hole process has become one of the key steps to achieve internal electrical connections in multi-layer circuit boards. Traditional plugging hole methods include horizontal plugging hole and vertical plugging hole, but these methods gradually show limitations when facing increasingly complex PCB designs.

[0003] The horizontal plugging hole technology is a relatively traditional method. By placing the PCB board to be plugged horizontally on a platform, using a screen plate with many meshes, pouring the ink from the screen plate onto the PCB board, and applying pressure with a special squeegee, the ink can smoothly enter the through holes on the PCB board. This method can plug holes for the entire PCB board or can meet specific requirements through selective plugging holes. However, the horizontal plugging hole technology has some significant technical problems:

[0004] 1. Insufficient pressure: Due to the way of squeezing with a squeegee, the applied pressure is small, and it is difficult to process PCB boards with a high aspect ratio.

[0005] 2. Tool limitation: Limited by the screen plate tool, this technology has high requirements for holes and cannot process products with small hole pitches.

[0006] 3. Aperture difference control: The aperture differences of different holes need to be strictly controlled within ±0.1 mm, otherwise the plugging hole effect will be affected.

[0007] To solve some defects of the horizontal plugging hole technology, the vertical plugging hole technology has been developed. In this method, the PCB board is vertically fixed on the workbench, the ink is extruded by a nozzle and covers an area, and then the nozzle is moved to cover the entire board surface. During the process of extruding the ink, the air resistance is reduced by means of vacuum pumping, so as to help the ink enter the through holes or blind holes. Although the vertical plugging hole technology avoids using the screen plate tool, it also brings new challenges:

[0008] 1. Ink residue problem: Since the screen plate tool is not used, there will be more ink residues on the board surface in the vertical plugging hole technology, which makes selective plugging holes difficult and usually only full-board plugging holes can be carried out.

[0009] 2. Lack of flexibility: For application scenarios that require precise control of the plugging hole position, the vertical plugging hole technology lacks sufficient flexibility. Summary of the Invention

[0010] In order to overcome the deficiencies of the prior art, the present invention provides an injection-type plugging high-temperature nozzle structure. By means of single-point injection, ink droplets of a fixed size are sprayed into the target holes of a PCB board, which can adapt to holes of different sizes and shapes and is not affected by aperture differences.

[0011] The technical solution of the present invention is as follows: An injection-type plugging high-temperature nozzle structure, comprising:

[0012] A nozzle body, in which a mixing chamber, an ink flow passage, and a high-temperature compressed air flow passage coaxial with the ink flow passage are provided. Along the axial direction of the nozzle body from top to bottom, the ink flow passage has a trend of decreasing inner diameter, and the ink flow passage communicates with the mixing chamber. The lower end of the high-temperature compressed air flow passage is provided with an air knife passage, and the high-temperature compressed air flow passage communicates with the mixing chamber through the air knife passage. The air knife passage has a continuously tapered conical structure along the axial direction of the nozzle body from top to bottom, so that the high-temperature compressed air is ejected radially and collides and merges with the ink droplets, cutting the ink droplets and keeping them in a highly fluid molten state.

[0013] Further, the air knife passage is annularly arranged around the outside of the ink flow passage. An air knife outlet is formed at the lower end of the air knife passage. The air knife outlet is an annular narrow slit with a width of 1 mm to 1.5 mm, and the air outlet direction of the air knife outlet forms an angle of 20° to 45° with the central axis of the ink flow passage.

[0014] Further, the nozzle body includes a first nozzle unit and a second nozzle unit, and the first nozzle unit and the second nozzle unit are cooperatively connected;

[0015] A first high-temperature compressed air passage and a high-temperature compressed air heater are provided in the first nozzle unit. The high-temperature compressed air heater is used to heat the compressed air in the first high-temperature compressed air passage to form high-temperature compressed air;

[0016] A second high-temperature compressed air passage is provided in the second nozzle unit. The second high-temperature compressed air passage and the first high-temperature compressed air passage are connected to form the high-temperature compressed air flow passage. The second high-temperature compressed air passage has a tapered trend along the axial direction of the nozzle body from top to bottom, and the cross section of the second high-temperature compressed air passage is annular.

[0017] Further, an ink inlet channel is provided in the first nozzle unit. The ink inlet channel has a cylindrical structure. An ink delivery channel communicating with the ink inlet channel is provided in the second nozzle unit. The ink inlet channel and the ink delivery channel form the ink circulation channel. The ink delivery channel has a continuously tapered conical structure that tapers from top to bottom along the axis of the nozzle body.

[0018] Further, the tapered section of the ink delivery channel is divided into three levels, and the cone angles of each level are 15°, 10°, and 5° respectively. The adjacent levels are transitioned by a fillet with a radius of 0.2 mm.

[0019] Further, an ink inlet is provided at the upper end of the ink circulation channel, and an ink outlet communicating with the center position at the top of the mixing chamber is provided at the lower end of the ink circulation channel. The diameter of the ink inlet is 10 mm to 20 mm, and the diameter of the ink outlet is 1 mm to 3 mm.

[0020] Further, a jet orifice is provided at the lower end of the mixing chamber. The molten ink liquid is injected into the target hole of the PCB board in the state of atomized ink from the jet orifice.

[0021] Further, the tapered angle of the air knife channel is 5° to 15°, so that the high-temperature compressed air collides with the ink in a radial manner, forming atomized ink and injecting it into the target hole of the PCB board through the jet orifice at the bottom of the mixing chamber.

[0022] Further, the high-temperature compressed air heater is a PID temperature control electromagnetic induction heater.

[0023] Further, a sealing ring is provided between the first nozzle unit and the second nozzle unit.

[0024] In addition, the present invention also provides a horizontal injection device, including the above-mentioned injection-type plug hole high-temperature nozzle structure.

[0025] According to the present invention of the above solution, its beneficial effects are as follows:

[0026] (1) For the injection-type plug hole high-temperature nozzle structure provided by the present invention, the air knife channel has a continuously tapered conical structure that tapers from top to bottom along the axis of the nozzle body, so that the high-temperature compressed air is ejected radially and collides and merges with the ink droplets, cutting the ink droplets and keeping them in a highly fluid molten state, which can effectively reduce the viscosity of the ink droplets and avoid the viscosity increase or solidification phenomenon caused by cooling. During the plug hole process, the ink droplets can uniformly fill the target hole, reducing the risk of voids and incomplete filling, thereby improving the quality and consistency of the plug hole.

[0027] (2) The injection-type plugging high-temperature nozzle structure provided by the present invention has an ink flow channel in the nozzle body that gradually decreases in inner diameter from top to bottom. This design helps to form a stable ink fluid pressure, ensuring that the amount of ink ejected each time is fixed and controllable. Secondly, it allows for independent operation of each target hole without relying on traditional screen tools or large-area covering methods, and is particularly suitable for plugging operations of micro-vias or blind vias in high-density interconnect (HDI) PCB boards.

[0028] (3) The injection-type plugging high-temperature nozzle structure provided by the present invention, compared with the horizontal plugging technology, does not rely on screen tools and is not restricted by the hole pitch. Compared with the vertical plugging technology, this nozzle structure can avoid ink residue problems by precisely controlling the injection direction and force. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of the injection-type plugging high-temperature nozzle structure in the embodiments of the present invention;

[0031] In the figure, 1, nozzle body; 11, mixing chamber; 12, ink flow channel; 13, high-temperature compressed air flow channel; 14, air knife channel; 2, first nozzle unit; 21, first high-temperature compressed air channel; 22, high-temperature compressed air heater; 23, ink inlet channel; 3, second nozzle unit; 31, second high-temperature compressed air channel; 32, ink delivery channel; 4, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further describes the embodiments of the present invention in detail in conjunction with the drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0033] To better understand the present invention, the following further describes the present invention in conjunction with the drawings and embodiments:

[0034] See Figure 1As shown in the figure, an injection-type plugging high-temperature nozzle structure provided by an embodiment of the present invention includes a nozzle body 1. A mixing chamber 11, an ink flow channel 12, and a high-temperature compressed air flow channel 13 coaxial with the ink flow channel 12 are arranged in the nozzle body 1. Along the axial direction of the nozzle body 1 from top to bottom, the inner diameter of the ink flow channel 12 shows a decreasing trend, and the ink flow channel 12 communicates with the mixing chamber 11. A gas knife channel 14 is arranged at the lower end of the high-temperature compressed air flow channel 13, and the high-temperature compressed air flow channel 13 communicates with the mixing chamber 11 through the gas knife channel 14. The gas knife channel 14 is in a continuously tapered conical structure along the axial direction of the nozzle body 1 from top to bottom, so that the high-temperature compressed air is ejected radially and collides and merges with the ink droplets, cutting the ink droplets and keeping them in a highly fluid molten state.

[0035] Specifically, the gas knife channel 14 is in a continuously tapered conical structure along the axial direction of the nozzle body 1 from top to bottom, so that the high-temperature compressed air is ejected radially and collides and merges with the ink droplets. At the same time, the radial air flow forms multi-directional shear forces to cut the ink droplets in multiple directions and avoid ink agglomeration. When the high-temperature compressed air collides with the ink, the heat loss of the ink is compensated through heat conduction, offsetting the increase in viscosity caused by the cooling of the ink, ensuring its fluidity when it is located in the mixing chamber 11, so that the ink droplets are maintained in a molten state. After the gas-liquid mixed fluid formed by the collision and fusion forms a high-temperature and high-pressure environment in the mixing chamber 11, the pressure drops suddenly through the lower port of the mixing chamber 11, and finally atomized ink is injected into the target holes of the PCB board.

[0036] In this embodiment, the inner diameter of the ink flow channel 12 in the nozzle body 1 shows a gradually decreasing trend from top to bottom. Such a design helps to form a stable ink fluid pressure and ensures that the ink volume injected each time is fixed and controllable.

[0037] Adopting an injection-type plugging high-temperature nozzle structure provided by an embodiment of the present invention can allow independent operation of each target hole, without relying on traditional screen tools or large-area covering methods, and is particularly suitable for plugging operations of micro-vias or blind vias in high-density interconnect (HDI) PCB boards.

[0038] Compared with the horizontal plugging technology, the injection-type plugging high-temperature nozzle does not rely on screen tools and is not limited by the hole pitch; compared with the vertical plugging technology, this nozzle structure can avoid ink residue problems by precisely controlling the spraying direction and force.

[0039] Specifically, the air knife channel 14 is arranged in a ring around the outside of the ink circulation channel 12. An air knife outlet is formed at the lower end of the air knife channel 14. The air knife outlet is an annular narrow slit with a width of 1 mm to 1.5 mm, and the air outlet direction of the air knife outlet forms an angle of 20° to 45° with the central axis of the ink circulation channel 12. With this design, a radial air flow forms an angle of 20° to 45° with the central ink jet, thereby generating a composite shear effect. The axial component of the shear force realizes the main fragmentation, breaking the initial ink droplets of 1 to 3 mm into 200 to 500 μm at one time; the radial component of the shear force can induce the droplets to rotate and become unstable, and perform secondary fragmentation through the action of centrifugal force, further reducing the particle size. Secondly, the high-temperature compressed air is ejected from the air knife outlet in a ring-shaped radial air flow, which can ensure that the ink droplets are subjected to cutting forces in all directions, so that the ink droplets are cut into uniform small droplets, which helps to improve the consistency and uniformity of ink filling during the plugging process and reduce filling defects caused by uneven ink distribution.

[0040] It is worth mentioning that the air knife outlet is an annular narrow slit with a width of 1 mm to 1.5 mm. With this design, a high-speed and concentrated air flow can be generated, enhancing the cutting ability of the ink droplets. At the same time, due to the narrow slit, the amount of gas passing through per unit time is small, but the pressure is higher, avoiding the problem of easy air flow diffusion in the traditional air knife channel 14 with a larger opening, and further improving the effectiveness of cutting.

[0041] Specifically, the nozzle body 1 includes a first nozzle unit 2 and a second nozzle unit 3, and the first nozzle unit 2 and the second nozzle unit 3 are cooperatively connected; in this embodiment, the first nozzle unit 2 and the second nozzle unit 3 are detachably connected. With this design, when maintenance or cleaning of the first nozzle unit 2 and the second nozzle unit 3 is required, the first nozzle unit 2 and the second nozzle unit 3 can be disassembled for corresponding operations, which not only improves the maintainability of the nozzle, but also reduces the production interruption time caused by nozzle failures and improves production efficiency.

[0042] In this embodiment, a sealing ring 4 is arranged between the first nozzle unit 2 and the second nozzle unit 3, and the sealing ring 4 can effectively prevent high-temperature compressed air and ink from leaking out through the gap between the first nozzle unit 2 and the second nozzle unit 3.

[0043] A first high-temperature compressed air channel 21 and a high-temperature compressed air heater 22 are arranged in the first nozzle unit 2, and the high-temperature compressed air heater 22 is used to heat the compressed air in the first high-temperature compressed air channel 21 to form high-temperature compressed air;

[0044] A second high-temperature compressed air channel 31 is arranged in the second nozzle unit 3. The second high-temperature compressed air channel 31 is connected to the first high-temperature compressed air channel 21 to form a high-temperature compressed air circulation channel 13. The second high-temperature compressed air channel 31 gradually shrinks from top to bottom along the axial direction of the nozzle body 1, and the cross-section of the second high-temperature compressed air channel 31 is an annular structure.

[0045] In this embodiment, an ink inlet channel 23 is provided in the first nozzle unit 2, and the ink inlet channel 23 has a cylindrical structure. An ink delivery channel 32 connected to the ink inlet channel 23 is provided in the second nozzle unit 3. The ink inlet channel 23 and the ink delivery channel 32 constitute an ink circulation channel 12. The ink delivery channel 32 has a continuously tapered structure from top to bottom along the axial direction of the nozzle body 1.

[0046] In one embodiment, the tapered section of the ink delivery channel 32 is divided into three levels, and the taper angles of each level are 15°, 10°, and 5°, respectively, and adjacent levels are transitioned by fillets with a radius of 0.2 mm.

[0047] The tapered section of the ink delivery channel 32 is divided into three levels, and the cone angle of each level gradually decreases (15°, 10°, and 5°, respectively). This design allows the ink to be gradually pressurized and accelerated in the channel. When the ink enters the first-level tapered section (cone angle of 15°), the inner diameter of the channel begins to decrease, the ink flow rate increases, and the pressure increases accordingly; then it enters the second-level tapered section (cone angle of 10°), the channel further contracts, and the ink flow rate and pressure are further increased; finally, it enters the third-level tapered section (cone angle of 5°), and the ink reaches a higher flow rate and pressure. Through the graded tapering method, the ink has sufficient pressure and flow rate when entering the mixing chamber 11, which helps the ink to fully contact with the high-temperature compressed air, thereby improving the cutting uniformity.

[0048] Adjacent stages are transitioned by rounded corners with a radius of 0.2mm. This design not only helps to reduce the sharp edges caused by the change in cone angle to reduce the energy loss of ink during the flow process, but also effectively prevents ink from accumulating at the edges or forming dead corners, reducing the risk of clogging.

[0049] In this embodiment, an ink inlet is provided at the upper end of the ink circulation channel 12, and an ink outlet is provided at the lower end of the ink circulation channel 12, which is connected to the center of the top of the mixing chamber 11. The diameter of the ink inlet is 10 mm to 20 mm, and the diameter of the ink outlet is 1 mm to 3 mm. Preferably, the diameter of the ink inlet is 10 mm, and the diameter of the ink outlet is 3 mm.

[0050] In this embodiment, a jet port is provided at the lower end of the mixing chamber 11, and the molten ink liquid is injected into the target hole of the PCB board from the jet port in the state of atomized ink.

[0051] In this embodiment, the taper angle of the air knife channel 14 is designed to be 5° to 15°. This angle range enables the high-temperature compressed air to collide with the ink radially, thereby atomizing the ink and injecting it into the target holes of the PCB through the injection ports at the bottom of the mixing chamber 11. Herein, the taper angle refers to the conical angle formed by the part with a gradually decreasing cross-sectional area in a fluid channel (such as the air knife channel 14), that is, the included angle between the two side walls of the fluid channel in the cross-section of the fluid channel.

[0052] Preferably, the taper angle is 10° to 12°. Within this range, a continuously accelerating flow field can be formed by the compressed air in the air knife channel 14. Specifically, when the taper angle is less than 10°, the air flow acceleration efficiency can be increased by 18% to 25%, but the risk of flow separation also increases; when the taper angle is greater than 12°, although the boundary layer is more stable, the kinetic energy conversion rate will decrease by 15% to 20%. Therefore, the taper angle is preferably 10° to 12°, which can not only ensure that the air flow velocity meets the requirements, but also increase the air flow kinetic energy density by 3 to 5 times compared with the conventional design, thereby providing sufficient energy support for the subsequent droplet breakup process.

[0053] In this embodiment, the high-temperature compressed air heater 22 is a PID temperature-controlled electromagnetic induction heater.

[0054] For further explanation, the embodiment of the present invention also provides an ink injection method for the injection-type plug-hole high-temperature nozzle structure, which includes the following steps:

[0055] S1. The ink circulation channel 12 trends to have a decreasing inner diameter from top to bottom along the axis direction of the nozzle body 1, thereby constructing an ink liquid velocity gradient in the ink circulation channel 12; then the ink is injected into the ink inlet channel 23 through the hose channel by air pressure. The ink inlet diameter of the ink circulation channel 12 is 1 cm, and the ink outlet diameter of the ink circulation channel 12 is 3 mm. When the ink enters 5 cm away from the ink inlet, the ink is heated to 80°C by the PID temperature-controlled electromagnetic induction heater. The heated ink is transmitted through the ink inlet channel 23 in the first nozzle unit 2, and then pressurized by air pressure (the pressure is 3000 mm water column) to squeeze the ink into the ink delivery channel 32. The ink delivery channel 32 is a continuously shrinking tapered hole, and finally the ink is formed into droplets of a fixed size and delivered to the mixing chamber 11.

[0056] S2. Use high-temperature compressed air to shear and break the ink droplets, so that the ink droplets are evenly dispersed in the mixing chamber 11 and are in a molten state; specifically, the high-temperature compressed air is heated to 100° C. by the electric heater at the entrance of the first high-temperature compressed air channel 21, and then transported to the mixing chamber 11 through the first high-temperature compressed air channel 21 and the second high-temperature compressed air channel 31, and heat is transferred to the ink droplets during the collision and fusion process with the ink droplets, so as to compensate for the heat loss during the transmission process, and the ink droplets maintain a molten state with high fluidity;

[0057] S3. After the ink droplets are sheared and crushed in the mixing chamber 11, the high-temperature and high-pressure ink droplets are released through a short-diameter spray channel with a diameter of 1 cm. The droplets are sprayed from a high-pressure environment to a low-pressure environment and injected into the target holes of the PCB board in the form of atomized ink. That is, through the cavitation effect caused by the sudden pressure drop, the ink droplets are injected into the target holes of the PCB board in the form of atomized particles, and surface microstructures are generated in the target holes of the PCB board, thereby fully filling the target holes of the PCB board to complete the processing process.

[0058] It should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the application product is usually placed when used, or is the orientation or position relationship commonly understood by technical personnel in this field, or is the orientation or position relationship in which the application product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does 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.

[0059] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0060] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An injection type plugging high-temperature nozzle structure, characterized in that, Comprising: A nozzle body (1), within which a mixing chamber (11), an ink flow passage (12), and a high-temperature compressed air flow passage (13) coaxial with the ink flow passage (12) are provided. Along the axial direction of the nozzle body (1) from top to bottom, the ink flow passage (12) has a tendency of decreasing inner diameter, and the ink flow passage (12) communicates with the mixing chamber (11). At the lower end of the high-temperature compressed air flow passage (13), an air knife passage (14) is provided, and the high-temperature compressed air flow passage (13) communicates with the mixing chamber (11) through the air knife passage (14). The air knife passage (14) is in a continuously tapered conical structure along the axial direction of the nozzle body (1) from top to bottom, so that the high-temperature compressed air is ejected radially and collides and merges with the ink droplets, causing the ink droplets to be cut and maintained in a highly fluid molten state.

2. The structure of an injection-type plugging high-temperature nozzle according to claim 1, wherein: The air knife passage (14) is annularly disposed around the outside of the ink flow passage (12). At the lower end of the air knife passage (14), an air knife outlet is formed. The air knife outlet is an annular narrow slit with a width of 1 mm to 1.5 mm, and the air outlet direction of the air knife outlet forms an angle of 20° to 45° with the central axis of the ink flow passage (12).

3. The structure of an injection-type plugging high-temperature nozzle according to claim 2, characterized in that: The nozzle body (1) includes a first nozzle unit (2) and a second nozzle unit (3), and the first nozzle unit (2) and the second nozzle unit (3) are cooperatively connected; Within the first nozzle unit (2), a first high-temperature compressed air passage (21) and a high-temperature compressed air heater (22) are provided. The high-temperature compressed air heater (22) is used to heat the compressed air in the first high-temperature compressed air passage (21) to form high-temperature compressed air; Within the second nozzle unit (3), a second high-temperature compressed air passage (31) is provided. The second high-temperature compressed air passage (31) and the first high-temperature compressed air passage (21) are connected to form the high-temperature compressed air flow passage (13). The second high-temperature compressed air passage (31) has a tapered trend along the axial direction of the nozzle body (1) from top to bottom, and the cross-section of the second high-temperature compressed air passage (31) is in an annular structure.

4. The structure of an injection-type plugging high-temperature nozzle according to claim 3, characterized in that: Within the first nozzle unit (2), an ink inlet passage (23) is provided. The ink inlet passage (23) is in a cylindrical structure. Within the second nozzle unit (3), an ink delivery passage (32) connected to the ink inlet passage (23) is provided. The ink inlet passage (23) and the ink delivery passage (32) form the ink flow passage (12). The ink delivery passage (32) is in a continuously tapered conical structure along the axial direction of the nozzle body (1) from top to bottom.

5. The structure of an injection-type plugging high-temperature nozzle according to claim 4, wherein: The tapered section of the ink delivery passage (32) is divided into three levels, and the cone angles of each level are 15°, 10°, and 5° respectively. The adjacent levels are transitioned by a fillet with a radius of 0.2 mm.

6. The structure of an injection-type plugging high-temperature nozzle according to claim 1, wherein: An ink inlet is provided at the upper end of the ink flow channel (12), and an ink outlet communicating with the center position at the top of the mixing chamber (11) is provided at the lower end of the ink flow channel (12). The diameter of the ink inlet is 10 mm to 20 mm, and the diameter of the ink outlet is 1 mm to 3 mm.

7. An injection type plugging high-temperature nozzle structure according to claim 1, characterized in that: A jet orifice is provided at the lower end of the mixing chamber (11), and the molten ink liquid is injected into the target hole of the PCB board in the state of atomized ink from the jet orifice.

8. The structure of an injection-type plugging high-temperature nozzle according to claim 3, characterized in that: The taper angle of the air knife channel (14) is 5° to 15°, so that the high-temperature compressed air collides with the ink radially to form atomized ink and is injected into the target hole of the PCB board through the jet orifice at the bottom of the mixing chamber (11).

9. The structure of an injection-type plugging high-temperature nozzle according to claim 3, characterized in that: A sealing ring (4) is provided between the first nozzle unit (2) and the second nozzle unit (3).

10. A horizontal injection device, characterized in that, It includes the injection type plug hole high-temperature nozzle structure according to any one of claims 1 to 9.

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