Scraper tin spraying device

Abstract

The utility model discloses a scraper tin spraying device which comprises a base, and a rotating mechanism, a nozzle and a scraper are fixedly arranged on the base. The steel mesh is provided with a material storage channel, the material storage channel is used for storing target materials, and the steel mesh is fixed to the rotating mechanism; the rotating mechanism is used for driving the steel mesh to rotate; a nozzle for spraying a target material; and the scraper is used for scraping the target material into the material storage channel. According to the tin brushing device, efficient tin brushing of uneven samples can be achieved, meanwhile, tin brushing uniformity is considered, and the problem of needle blocking does not exist.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, specifically to a tin-spraying device using a scraper. Background Technology

[0002] In the fields of semiconductor packaging, LED packaging, and SMT, existing technologies for solder paste dispensing mainly employ stencil brushing, piezoelectric valve spraying, extrusion soldering, or dip-type soldering. These existing technologies currently have the following technical problems:

[0003] Among them, stencil soldering requires bonding to the product's solder pads and making large-format stencils, so it is mainly used for mass production of planar PCB substrates. It is less suitable for products that require expansion and contraction adaptation, uneven surfaces (such as warping, flexible bending, or deep cavity structures), and products with small-batch prototyping.

[0004] The impact pin of the piezoelectric valve for soldering needs to make hard contact with the nozzle head. This will cause the solder paste particles at the contact point to deform, resulting in a relatively common problem of nozzle clogging. Therefore, piezoelectric valve soldering is currently mostly used for large-size PCB pads, usually with a dot diameter of more than 200μm. The smaller the soldering size, the more frequent the nozzle clogging phenomenon.

[0005] Both extrusion soldering and dip soldering are contact soldering methods. Both require the needle to contact the PCB pads, so the motor waits for a long time to make contact, resulting in low soldering efficiency, usually below 5Hz per point.

[0006] In addition, due to the unevenness of solder paste particles leading to large fluctuations in solder paste viscosity, piezoelectric valve soldering, extrusion soldering, and dip soldering all suffer from poor dot diameter uniformity.

[0007] Therefore, there is an urgent need to develop a device suitable for tinning uneven samples, while taking into account both tinning uniformity and tin spraying efficiency. Utility Model Content

[0008] In view of this, the present invention provides a squeegee tin spraying device to solve the technical problems of existing technology being unsuitable for tin spraying on uneven samples, or failing to take into account both tin spraying uniformity and tin spraying efficiency.

[0009] This utility model provides a tin-spraying device for a scraper, comprising:

[0010] A base, on which a rotating mechanism, a nozzle, and a scraper are fixedly mounted;

[0011] A steel mesh sheet, wherein the steel mesh sheet is provided with a material storage channel for storing target material, and the steel mesh sheet is fixed on a rotating mechanism;

[0012] A rotating mechanism, used to drive the steel mesh sheet to rotate;

[0013] Nozzles are used to spray target materials.

[0014] A scraper is used to scrape the target material into the storage channel.

[0015] Furthermore, the rotating mechanism drives the steel mesh to rotate until the storage channel containing the target material is aligned with the nozzle's spray port, the diameter of which is larger than that of the storage channel.

[0016] Furthermore, the material storage channel can be designed with an opening according to the requirements of the injection point diameter. The opening shape can be square or round, etc., and there are no specific restrictions on the shape.

[0017] Furthermore, the steel mesh is circular, and there are several storage channels on the steel mesh. The storage channels are arranged in at least one circle on the steel mesh, and each circle of storage channels is located at the same distance from the center of the circular steel mesh.

[0018] Furthermore, the target material, i.e. the material to be sprayed, is preferably solder paste.

[0019] Furthermore, the base is also provided with a storage tube for storing the target material. The storage tube can be fixed to the base with a universal Luer connector, which is compatible with 3cc to 30cc.

[0020] Furthermore, the nozzle is provided with a nozzle air passage, the cross-section of which is funnel-shaped and extends through the entire nozzle. Specifically, the position of the nozzle is not specifically limited and can be adjusted according to actual conditions.

[0021] Furthermore, a steel sheet fixing base is provided below the steel mesh sheet for better fixing of the steel mesh sheet.

[0022] Furthermore, the rotating component includes a rotating shaft and a rotating base, and the steel sheet fixing base and the steel mesh sheet are fixed on the rotating base; specifically, the rotating shaft is connected to a motor, and the motor can drive the rotating shaft to rotate together with the rotating base, the steel mesh sheet fixed on the rotating base, and the steel sheet fixing base.

[0023] Furthermore, the thinner the steel mesh, the more stable the process of this scheme. However, it is also necessary to ensure that there is a certain thickness for storing the target material. If the thickness is too large, the scraper will not be able to fill the material in the storage channel, resulting in high nozzle spray resistance. Therefore, the thickness of the steel mesh is controlled at 20-200 μm; the ratio W of the storage channel diameter to the steel mesh thickness satisfies: 2 <W≤10。

[0024] Furthermore, the scraper is installed at an angle on the base. The angle of inclination needs to be adjusted according to factors such as material characteristics, steel mesh thickness and opening size. The angle of inclination is generally controlled between 45° and 60°. The smaller the angle of inclination, the greater the downward pressure. The rotation speed of the steel mesh should also be slowed down accordingly to facilitate scraping the target material into the storage channel.

[0025] Furthermore, a steel sheet support is provided below the nozzle's spray port, which not only helps to strengthen the steel mesh but also provides support around the nozzle during spraying, thus extending the service life of the steel sheet; the steel sheet support is provided with a spray notch.

[0026] Furthermore, the upper opening of the injection notch is larger than the material storage channel, and the lower opening of the injection notch is greater than or equal to the upper opening.

[0027] Furthermore, a steel sheet support is provided below the scraper, which can enhance the scraping of the target material into the storage channel.

[0028] Furthermore, the base is also equipped with a material detection optical fiber and an opening filling detection component. The material detection optical fiber is used to detect the remaining material at the scraper. If the material is insufficient, a portion of the material in the storage tube is squeezed onto the steel mesh to achieve automatic feeding. The opening filling detection component is used to detect whether the opening is filled with material. If the filling is abnormal, it will not trigger when rotating to the spray nozzle. If no abnormality is detected, the target material will be sprayed normally.

[0029] Furthermore, the opening filling detection component can be either a detection sensor or a visual recognition method used by a CCD camera.

[0030] The working process of the scraper tin-spraying device includes the following steps:

[0031] Start the rotating mechanism to make the steel mesh rotate together;

[0032] The spray material in the storage pipe is forced onto the steel mesh by air pressure;

[0033] During rotation, the scraper scrapes the target material into the storage channel of the steel mesh;

[0034] After the steel mesh rotates, it aligns the storage channel containing the target material with the nozzle's spray port;

[0035] Activate the nozzle to apply air pressure to the storage channel and spray the material out.

[0036] Furthermore, the rotation speed during the rotation process is controlled to be 0.1 to 50 rpm, which can be adjusted according to actual process requirements. In addition, when the material storage channel is aligned with the injection nozzle to prepare for material injection, the dwell time of the rotating shaft can be appropriately increased to improve injection stability.

[0037] The scraper tin spraying device and method provided by this utility model have the following beneficial effects: the scraper tin spraying device can achieve efficient tin spraying for uneven samples through the cooperation of the rotating mechanism and the nozzle, while also ensuring the uniformity of tin spraying and eliminating the problem of needle blockage; in addition, the device can also realize automatic feeding and automatic detection of material filling, which is an automated processing equipment with good application prospects in actual industrial manufacturing. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the tin-spraying device for the scraper described in this utility model;

[0039] Figure 2 This is a top view of the tin-spraying device for the scraper described in this utility model;

[0040] Figure 3 This is a schematic diagram of the structure of the steel mesh sheet described in this utility model;

[0041] Figure 4 This is a schematic diagram of the device described in Comparative Example 1;

[0042] Figure 5 This is a schematic diagram of the device described in Comparative Example 2;

[0043] Figure 6 This is a schematic diagram of the device described in Comparative Example 3;

[0044] Figure 7 This is a schematic diagram of the device described in Comparative Example 4.

[0045] Explanation of reference numerals in the attached drawings: 1. Base, 2. Nozzle, 3. Scraper, 4. Steel mesh, 5. Material storage channel, 6. Target material, 7. Material storage pipe, 8. Nozzle air passage, 9. Steel sheet fixing base, 10. Rotating shaft, 11. Rotating base, 12. Steel sheet support, 13. Spray notch, 14. Material detection fiber optic cable, 15. Opening filling detection component, 16. Screw. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] Example

[0048] like Figure 1As shown, the tin-spraying device of this utility model includes a base 1, a rotating mechanism, a nozzle 2, a scraper 3, and a storage tube 7. The rotating mechanism, nozzle 2, scraper 3, and storage tube 7 are all fixed to the base 1. The rotating mechanism drives the stencil 4 to rotate. The stencil 4 has a ring of storage channels 5 for storing target material 6. The nozzle 2 sprays the target material 6, and the scraper 3 scrapes the target material 6 into the storage channels 5. The scraper 3 is installed at an angle on the base 1, and the angle can be adjusted in real time according to factors such as material characteristics, stencil thickness, and opening size. In this embodiment, the optimal angle of the scraper 3 is 60°. In this embodiment, the storage tube 7 is 30cc and is installed on the base 1 using a Luer connector. The material inside the storage tube 7 is solder paste.

[0049] The nozzle 2 is equipped with a nozzle air passage 8, which has a funnel-shaped cross-section and runs through the entire nozzle 2. The air passage 8 forms a spray nozzle at the bottom of the nozzle 2, and the diameter of the spray nozzle is larger than that of the storage channel 5. The position of the nozzle 2 can be adjusted according to actual conditions. In addition, a steel sheet support part 12 is provided below the spray nozzle of the nozzle 2, which not only helps to strengthen the steel mesh sheet but also provides support around the nozzle during spraying, thus improving the service life of the steel sheet. The steel sheet support part 12 is equipped with a spray notch 13, the upper opening of which is larger than that of the storage channel 5, and the lower opening of which is greater than or equal to that of the upper opening. When the rotating mechanism drives the steel mesh sheet 4 to rotate until the storage channel 5 containing the target material 6 is aligned with the spray nozzle 2, the nozzle 2 applies pressure through the nozzle air passage 8, spraying the target material 6 out of the storage channel 5.

[0050] A steel sheet fixing base 9 is also provided below the steel mesh sheet 4 for better fixing the steel mesh sheet 4. The rotating component includes a rotating shaft 10 and a rotating base 11. The steel sheet fixing base 9 and the steel mesh sheet 4 are fixed to the rotating base 11 by screws 16. Specifically, the rotating shaft 10 is connected to a motor, which can drive the rotating shaft 10 to drive the rotating base 11 and the steel mesh sheet 4 and the steel sheet fixing base 9 fixed on the rotating base 11 to rotate together.

[0051] A steel sheet support 12 is also provided below the scraper 3 to enhance the scraping of the target material into the storage channel. The steel sheet fixing base 9 is flush with the height of the steel sheet support 12 located below the scraper 3 and the injection nozzle, ensuring that the steel mesh 4 is on the same horizontal plane. Figure 2 As shown, the steel sheet support 12 is arranged in a fan shape at the corresponding position in the top view. The fan-shaped opening at the bottom of the top view does not have a steel sheet support, so that the commissioning personnel can check the operating status of the device.

[0052] In addition, the scraper tin spraying device of this embodiment also includes a material detection optical fiber 14 and an opening filling detection component 15. The material detection optical fiber 14 is used to detect the remaining status of the target material, and the opening filling detection component 15 is used to detect the filling status of the target material 6 at the storage channel 5.

[0053] like Figure 3 As shown, in this embodiment, the steel mesh 4 is a circular steel sheet with a minimum thickness of 20 μm. The material storage channel 5 is located at the same distance from the center of the circular steel mesh 4. The working process of the scraper tin spraying device in this embodiment includes:

[0054] (1) Fix the steel mesh 4 with a storage channel 5 around it onto the rotating base 1, and fix the rotating base 11 and the steel mesh 4 onto the rotating base with screws 16.

[0055] (2) Start the motor of the rotating mechanism so that the rotating shaft 10 drives the rotating base 11 to rotate together with the steel mesh 4;

[0056] (3) The material detection fiber optic cable 14 is used to control the storage pipe 7 to squeeze the target material 6 onto the steel mesh 4;

[0057] (4) During the rotation process, the scraper 3 scrapes the target material 6 into the storage channel 5 of the steel mesh 4;

[0058] (5) After the steel mesh 4 is rotated 180°, the storage channel 5 containing the target material 6 is aligned with the spray port of the nozzle 2; during the rotation, the steel mesh 4 passes through the opening filling detection component 15 to detect whether there is any abnormality in the material filling.

[0059] (6) Start the solenoid valve of nozzle 2, apply air pressure through nozzle air passage 8 to spray the material at the storage channel 5;

[0060] Among them, the material detection fiber optic cable 14 is used to detect the remaining material in the scraper section in real time. If the material is too little, a portion of the material in the storage tube 7 will be squeezed out onto the steel mesh 4. When the amount of accumulated material reaches the upper limit, the air pressure will be turned off to stop the extrusion, thus realizing automatic feeding.

[0061] The opening filling detection component 15 is used to detect whether the material in the storage channel 5 is full. If an abnormality is detected, it will not trigger when rotating to the spray nozzle position of the nozzle 2. If no abnormality is detected, the target material 6 will be sprayed normally. In this embodiment, the opening filling detection component 15 can be a detection sensor or a CCD camera using a vision scheme for recognition.

[0062] Comparative Example 1

[0063] See patent CN 118317520 A, which uses a stencil for soldering and specifically discloses a PCB solder paste printing machine with the following structure. Figure 4 As shown, the device includes a printing assembly, which includes a sleeve shaft. The sidewalls of the sleeve shaft are arrayed with feeding grooves, and scrapers are arrayed on the outer side of the sleeve shaft. The scrapers are located on one side of the feeding grooves. The inner cavity of the sleeve shaft is provided with a scraping shaft. The sidewalls of the scraping shaft are inclinedly provided with discharge grooves. A conveying pipe is installed through one side of the scraping shaft, and the conveying pipe communicates with the discharge groove. The printing assembly includes a sleeve located inside the mounting frame. The sleeve has a feeding groove arrayed on its sidewalls, and a scraper is arrayed on its outer side, located on one side of the feeding groove. A scraper shaft is located inside the sleeve, and a discharge groove is obliquely formed on its sidewall. A feed pipe is installed through one side of the scraper shaft, communicating with the discharge groove. The other end of the feed pipe extends through the sleeve to the outer side of the mounting frame. A fixed partition is sleeved on the other end of the scraper shaft, and the fixed partition is fixedly connected to the inner wall of the sleeve. The side of the fixed partition away from the scraper shaft has an array of teeth. A servo motor is installed through one side of the sleeve, and is fixedly connected to the outer side of the mounting frame. A rotating gear is fixedly installed at the output end of the motor. A transmission gear meshes above the rotating gear. The top of the transmission gear meshes with the teeth of the side wall of the fixed partition. The other end of the rotating gear is connected to one end of the scraper shaft. Solder paste is transported through the inner cavity of the scraper shaft and then through the discharge groove to the inner cavity of the sleeve shaft. The solder paste is discharged through the discharge groove opened on the side wall of the sleeve shaft. At this time, the servo motor inside the printing component is started. The servo motor drives the scraper shaft to rotate one revolution, which makes the solder paste adhering to the inner wall of the sleeve shaft completely fall off. After the scraper shaft rotates one revolution, the sleeve shaft rotates one-third of the way, and then a set of scrapers is replaced. Finally, the solder paste scraping operation is completed by the sliding block.

[0064] The main method of stencil soldering is as follows: a stencil for soldering is made according to the pattern of the entire PCB pads. Solder paste is applied to the stencil, the PCB is attached to the stencil, solder paste is applied by scraping with a scraper and squeezed into the opening of the stencil, and finally the stencil is lifted, leaving the solder paste on the pads.

[0065] Currently, stencil soldering is mainly used for mass production of planar PCB substrates. It usually requires a high degree of product fit, but is less suitable for products with uneven surfaces or for small-batch prototyping.

[0066] Comparative Example 2

[0067] See patent CN 220177371 U, which uses a piezoelectric valve for solder spraying, specifically disclosing a piezoelectric solder paste spraying valve with the following structure. Figure 5As shown, the device includes a valve body, a striking pin, and a nozzle. The striking pin is assembled within the valve body and has an impact plane at its impact end. The nozzle has an inlet cone surface, which is a conical surface. The striking pin impacts and collides with the inlet cone surface. The taper of the inlet cone surface is 90°. The impact plane of the striking pin mates with the inlet cone surface of the nozzle, ensuring uniform pressure and better spraying effect at the periphery of the contact area between the striking pin and the nozzle. In other words, the impact plane of the striking pin makes seamless contact with the nozzle, resulting in balanced adhesive pressure, improved spraying effect, and increased consistency of adhesive flow.

[0068] The main method of solder spraying using the above-mentioned piezoelectric valve is as follows: the piezoelectric ceramic drives the impact pin, which strikes the nozzle at high speed, thus ejecting the solder paste from the nozzle flow channel.

[0069] The core problem with piezoelectric valve soldering is that the striker and the nozzle head need to make hard contact. This hard contact will deform the solder paste particles at the contact point. Therefore, piezoelectric valve soldering is currently mostly used for large-size PCB pads, usually with a dot diameter of more than 200μm. The smaller the soldering size, the more frequent the pin blockage.

[0070] Comparative Example 3

[0071] See patent CN 112390217A, which uses an extrusion-type tin-dispensing method and specifically discloses a device for dispensing micro-volume liquids, with the structure as follows: Figure 6 As shown, it includes:

[0072] At least one nozzle for dispensing a viscous liquid through a tip opening of the at least one nozzle; at least one liquid reservoir supplying the viscous liquid to the nozzle; a liquid channel connecting the liquid reservoir to the nozzle; at least one positive pressure mechanism for providing positive pressure to the liquid reservoir; at least one control unit for controlling the operation of the device for dispensing micro-volume liquids; at least one pulse pressure mechanism for providing pulse pressure; an intermediate chamber introduced along the liquid channel, wherein the intermediate chamber includes: at least one pressure unit connected along the liquid channel, wherein the pressure unit allows the positive pressure mechanism and the pulse pressure mechanism to provide pulse pressure to the pressure unit to control the amount of the viscous liquid dispensed from the nozzle; at least one positive pressure directional control valve connected between the positive pressure mechanism and the liquid reservoir; and at least one pulse pressure directional control valve connected between the pulse pressure mechanism and the pressure unit.

[0073] The main method of the above-mentioned extrusion soldering is as follows: the solder storage needle and flow channel are squeezed by one or more air pressures, and then the solder paste is squeezed out through the needle installed at the head of the needle.

[0074] Extrusion soldering is a contact soldering method. During the soldering process, the needle will contact the PCB pads, so the motor waits for a long time to make contact, resulting in low soldering efficiency, usually below 5Hz per point.

[0075] Comparative Example 4

[0076] See patent CN 220006301 U, which employs a dip-type soldering method and specifically discloses a lamp board rework device containing a soldering component. The soldering component includes a soldering needle, a solder paste loading tray, a flexible wiping material, and a driving mechanism, with the structure as follows: Figure 7 As shown.

[0077] The solder paste loading tray has an open tray structure and is used to hold solder paste for the soldering needles to pick up.

[0078] Soldering needles, also commonly known as soldering tips, are used to pick up solder paste from a solder paste tray and apply it to solder pads. These pads can be on the LED board or any circuit board, depending on the specific application of the soldering component. For example, the pads could be on a MiniLED LED board.

[0079] The flexible wiper is used to insert soldering needles to wipe away solder paste adhering to the outer wall of the needles. The flexible wiper is made of a flexible material; during the insertion and removal of the soldering needles, it scrapes and cleans the solder paste adhering to the outer wall of the needles, allowing the solder paste to detach from the needles.

[0080] The main method of the above-mentioned dip-type soldering is as follows: dip the solder paste on the solder pad with a tungsten carbide needle, and then transfer it to the solder pad to stick the solder paste from the needle part onto the solder pad.

[0081] Dip-type soldering is also a type of contact soldering. During the soldering process, the needle will contact the PCB pads, which also has the problem of low soldering efficiency.

[0082] The technical effects and technical problems of the embodiments and comparative examples 1-4 are summarized in Table 1.

[0083] Table 1

[0084] plan Uneven substrate adapter Use cases Efficiency Needle blockage Solder paste uniformity Example adaptation High and low frequency uniformity high Won't Good uniformity Comparative Example 1 Incompatible High-frequency production high Won't Good uniformity Comparative Example 2 adaptation High-frequency production high meeting Uniformity is average Comparative Example 3 adaptation Inefficient prototyping Low meeting Poor uniformity Comparative Example 4 adaptation Inefficient prototyping Low Won't Uniformity is average

[0085] In summary, existing technologies such as stencil soldering, piezoelectric valve soldering, extrusion soldering, and dip soldering all have certain problems: Stencil soldering requires product bonding and the fabrication of large-format stencils, so it is mainly used for mass production of planar PCB substrates, and its applicability to products with uneven surfaces and small-batch prototyping is poor; the core problem of piezoelectric valve soldering is that the impact pin needs to make hard contact with the nozzle head, which can deform the solder paste particles at the contact point and easily lead to frequent pin blockage; extrusion soldering and dip soldering are both contact soldering methods, and both require the needle to contact the PCB pads, so the motor waiting time for contact is long, resulting in low soldering efficiency, usually below 5Hz per point. In addition, due to the unevenness of solder paste particles, the solder paste viscosity fluctuates greatly, and piezoelectric valve soldering, extrusion soldering, and dip soldering all have the problem of poor dot diameter uniformity.

[0086] The tin-spraying device described in this invention can efficiently tin-spray uneven samples while ensuring uniformity and eliminating pin clogging issues. Furthermore, the device can automatically feed materials and detect material filling status, making it an automated processing equipment with promising application prospects in actual industrial manufacturing.

[0087] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0088] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0089] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A tin-spraying device for a scraper, characterized in that, include: A base (1) is fixedly provided with a rotating mechanism, a nozzle (2) and a scraper (3); A steel mesh (4) is provided with a storage channel (5) for storing target materials. The steel mesh (4) is fixed on a rotating mechanism. A rotating mechanism is used to drive the steel mesh sheet (4) to rotate; Nozzle (2) is used to spray target material (6); A scraper (3) is used to scrape the target material into the storage channel (5).

2. The tin-spraying device for a scraper according to claim 1, characterized in that, The rotating mechanism drives the steel mesh (4) to rotate until the storage channel (5) containing the target material is aligned with the spray port of the nozzle (2).

3. The tin-spraying device for scrapers according to claim 2, characterized in that, The diameter of the injection port is larger than that of the storage channel (5).

4. The tin-spraying device for a scraper according to claim 1, characterized in that, The base (1) is also provided with a material storage pipe (7).

5. The tin-spraying device for a scraper according to claim 1, characterized in that, The nozzle (2) is provided with a nozzle air passage (8), the cross section of which is funnel-shaped and the nozzle air passage (8) runs through the entire nozzle (2).

6. The tin-spraying device for a scraper according to claim 1, characterized in that, A steel sheet fixing base (9) is provided below the steel mesh (4). The rotating component includes a rotating shaft (10) and a rotating base (11). The steel sheet fixing base (9) and the steel mesh (4) are fixed on the rotating base (11).

7. The tin-spraying device for a scraper according to claim 1, characterized in that, The ratio W of the diameter of the storage channel (5) to the thickness of the steel mesh (4) satisfies: 2 <W≤10。 8. The tin-spraying device for a scraper according to claim 1, characterized in that, The scraper (3) is mounted at an angle on the base (1).

9. The tin-spraying device for a scraper according to claim 1, characterized in that, The nozzle (2) has a steel plate support (12) below the spray port, and the steel plate support (12) has a spray notch (13).

10. The tin-spraying device for a scraper according to claim 9, characterized in that, The upper opening of the injection notch (13) is larger than the material storage channel (5), and the lower opening of the injection notch (13) is greater than or equal to the upper opening.

11. The tin-spraying device for a scraper according to claim 1, characterized in that, A steel sheet support (12) is provided below the scraper (3).

12. The tin-spraying device for a scraper according to claim 1, characterized in that, The base (1) is also provided with a material detection optical fiber (14) and an opening filling detection component (15). The material detection optical fiber (14) is used to detect the remaining material at the scraper (3), and the opening filling detection component (15) is used to detect the material filling at the storage channel (5).

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