A flux coating device for solder sheet

Abstract

This invention relates to the field of coating technology, specifically to a flux coating device for solder sheets, comprising a coating cylinder, a driving mechanism, and an extrusion mechanism; a rotating column is provided at the rear end of the coating cylinder; multiple atomizing nozzles are evenly distributed along the circumference of the rotating column at the front end; an annular groove is provided on the circumferential side wall of the rotating column; a flexible tube is provided in the groove. The extrusion mechanism clamps the flexible tube and drives the high-temperature flux liquid in the flexible tube to peristalse towards the atomizing nozzle, so that the amount of flux liquid delivered to each atomizing nozzle is the same. When the atomizing nozzle is blocked, the extrusion mechanism clamps the flexible tube towards the atomizing nozzle, increasing the hydraulic pressure of the flux liquid in the atomizing nozzle. The high-temperature flux liquid helps the solidified flux in the atomizing nozzle to remelt, so that the high-pressure flux liquid clears the atomizing nozzle, making the flux sprayed from each atomizing nozzle uniform and consistent, thus improving the flux coating effect.

Description

Technical Field

[0001] The invention relates to the technical field of coating, and in particular to a flux coating device for solder sheets. Background Art

[0002] Solder and flux are needed when soldering electronic devices on printed circuit boards. Solder is a metal material used to fill the weld during welding. According to welding requirements, solder sheets can be made into linear, paste, sheet, etc.; the main component of flux is rosin, which has the functions of anti-oxidation, reducing the surface tension of liquid solder, and promoting welding. When welding on printed circuit boards, linear solder sheets (i.e. solder wire) are often used to improve the consistency of product welding process. The surface of the solder sheet is coated with a layer of flux. The flux layer effectively blocks the oxidation of the solder sheet by oxygen in the air. By controlling the thickness ratio of the flux coating, excessive flux residue can be effectively avoided; the flux coating on the solder sheet is uniform, and the solder sheet is prefabricated into corresponding specifications according to the welding requirements of electronic devices of different shapes and specifications. Solder and flux are used accurately according to the actual required amount, thereby ensuring the consistency of the product welding process and improving work efficiency.

[0003] The existing solder sheet flux coating device usually adopts the dipping method, which has problems such as thick coating layer and uneven coating. The more advanced flux coating technology is the spraying method. The spraying method mainly sprays the flux melted into liquid onto the surface of the solder sheet through an atomizing nozzle. The spraying method can effectively reduce the coating thickness and improve the spraying effect. However, in the spraying method, the nozzle often solidifies the molten flux liquid due to the decrease in temperature, causing the nozzle to be blocked, resulting in uneven coating of the flux. Summary of the invention

[0004] The present invention provides a flux coating device for solder sheets to solve the above problems.

[0005] The invention discloses a flux coating device for solder sheets, which adopts the following technical scheme: a flux coating device for solder sheets, which comprises a coating cylinder, a driving mechanism and an extruding mechanism.

[0006] The coating cylinder axis is arranged front and back; a rotating column is arranged at the rear end of the coating cylinder; the rotating column is coaxially rotatably installed in the coating cylinder; a through hole is arranged at the axis of the rotating column; the solder sheet body is inserted into the coating cylinder from the front end of the coating cylinder, moves backward, and passes through the through hole to detach from the coating cylinder; a plurality of atomizing nozzles are arranged at the front end of the rotating column and are evenly distributed along the circumference of the rotating column; the spray direction of the atomizing nozzle is arranged to be inclined front and back and toward the axis of the rotating column; an annular groove is arranged on the circumferential side wall of the rotating column; the opening of the groove faces the inner wall of the coating cylinder and is coaxial with the rotating column.

[0007] The groove is provided with front and rear hoses; there are multiple hoses, which are evenly distributed along the circumference of the rotating column; the front end of the hose passes through the rotating column and is connected to the atomizing nozzle, and the rear end is provided with a storage component; the storage component is used to store the flux liquid and supply the flux liquid into the hose.

[0008] The driving mechanism is used to drive the rotating column to rotate; the flux mist droplets sprayed from the atomizing nozzle are sprayed toward the solder sheet body and rotate around the solder sheet body at the same time, so that the flux mist droplets are evenly adhered to the surface of the solder sheet body.

[0009] The extrusion mechanism is arranged in the groove, and is used for clamping the hose and driving the high-temperature flux liquid in the hose to creep toward the atomizing nozzle, so that the amount of flux liquid delivered to each atomizing nozzle is the same, and when the atomizing nozzle is blocked, the extrusion mechanism clamps the hose toward the atomizing nozzle, so that the hydraulic pressure of the flux liquid in the atomizing nozzle is increased, and the high-temperature flux liquid assists the solidified flux in the atomizing nozzle to re-melt, so that the high-pressure flux liquid dredges the atomizing nozzle, so that the flux spraying amount at each atomizing nozzle is uniform, thereby improving the flux coating effect.

[0010] Furthermore, the extrusion mechanism includes an extrusion convex strip; a plurality of extrusion convex strips are provided and evenly distributed along the circumference of the coating tube; the extrusion convex strips are fixed on the inner wall of the coating tube; the extrusion convex strips abut against the groove wall of the groove. When the driving mechanism drives the rotating column to rotate, the extrusion convex strips and the groove wall of the groove squeeze the hose, driving the flux liquid in the hose to creep toward the atomizing nozzle, so that negative pressure is formed at the rear end of the hose, so that the flux liquid in the storage component is sucked into the hose, so that the atomizing nozzle continuously sprays flux droplets.

[0011] Furthermore, the storage assembly includes an annular storage tank; the storage tank and the rotating column are coaxial; the storage tank is fixed at the rear end of the rotating column; the storage tank is connected to the rear end of the hose; and high-temperature flux liquid is injected into the storage tank.

[0012] Furthermore, the driving mechanism includes a driving ring and a driving motor; the driving ring is sleeved on the outside of the storage tank and fixed on the inner wall of the coating cylinder; the driving motor is fixed on the storage tank, and a driving wheel is fixed on the output end of the driving motor; the driving wheel and the driving ring are meshed for transmission. The driving motor drives the rotating column to rotate through the driving ring and the driving wheel.

[0013] Furthermore, an injection structure is provided in the storage tank; the injection structure is used to inject the flux liquid into the storage tank and prevent air from flowing into the atomizing nozzle along with the flux liquid, thereby affecting the atomization effect of the atomizing nozzle.

[0014] Furthermore, the injection structure includes a slip ring; the slip ring is arranged in the storage tank in a forward and backward sliding manner; the slip ring divides the storage tank into a front cavity and a rear cavity; the front cavity is connected to the hose, and the rear cavity is connected to the outside atmosphere; an injection pipe is arranged at the rear side of the slip ring; the injection pipe is arranged front and back, the front end is fixed on the slip ring and is connected to the front cavity, and the rear end passes through the rear cavity and extends to the outside of the coating tube; the injection pipe and the storage tank are slidably matched; an injection valve is installed at the rear end of the injection pipe. When the flux liquid needs to be injected, the slip ring is at the front end of the storage tank; after the outlet of the external syringe is connected to the injection pipe, the injection valve is opened, and the flux liquid enters the front cavity. As the flux liquid enters, the slip ring moves backward, thereby avoiding the presence of air in the front cavity. After the injection is completed, the injection valve is turned off and the syringe is unplugged. When spraying, the groove wall of the extruded convex strip and the groove squeezes the hose, driving the flux liquid in the hose to creep toward the atomizing nozzle, so that a negative pressure is formed at the rear end of the hose, and the flux liquid in the front cavity of the storage tank is sucked into the hose, and the slip ring moves forward accordingly.

[0015] Furthermore, a preheating mechanism is provided on the front side of the rotating column; the preheating mechanism is used to preheat and preliminarily spray the solder sheet body, thereby improving the spraying efficiency, improving the spraying quality, and reducing the flux waste or recycling process.

[0016] Furthermore, the preheating mechanism includes an air duct and an air supply ring; the air duct is provided with a plurality of air ducts, which are evenly distributed along the circumference of the coating tube; the air duct is tilted forward and backward and faces the axis of the rotating column; the air supply ring is coaxially fixed on the outer wall of the coating tube; the air supply cavity is hollow and annular inside the air supply ring; the air supply cavity is connected with the air duct; the air supply cavity is provided with an air injection port; the air injection port is connected with the fan through a pipeline. The fan blows air into the air supply cavity, and the wind blows from the air duct to the solder sheet body, so that the excess flux droplets that are not attached to the solder sheet body after being sprayed at the atomizing nozzle are guided by the wind blown by the air ducts of the plurality of preheating mechanisms to the solder sheet body at the front end of the coating tube, prolonging the impact contact time between the flux droplets and the solder sheet body, and using the residual heat of the flux droplets to preheat and preliminarily spray the solder sheet body, reducing the difference between the temperature of the solder sheet body when it moves to the atomizing nozzle and the temperature of the flux droplets sprayed from the atomizing nozzle, thereby improving the spraying quality and efficiency.

[0017] Furthermore, there are multiple preheating mechanisms distributed front and back along the axis of the coating cylinder.

[0018] Furthermore, an electric heating wire is arranged in the air supply cavity so that hot air is blown out through the air duct to improve the preheating effect on the solder sheet body.

[0019] The beneficial effects of the present invention are:

[0020] 1. The extrusion mechanism squeezes the hose and drives the high-temperature flux liquid in the hose to creep toward the atomizing nozzle, so that the amount of flux liquid delivered to each atomizing nozzle is the same. When the atomizing nozzle is blocked, the extrusion mechanism squeezes the hose toward the atomizing nozzle to increase the hydraulic pressure of the flux liquid in the atomizing nozzle. The high-temperature flux liquid assists the solidified flux in the atomizing nozzle to re-melt, so that the high-pressure flux liquid dredges the atomizing nozzle, making the flux spraying amount at each atomizing nozzle uniform and consistent, thereby improving the flux coating effect.

[0021] 2. The fan blows air into the air supply cavity, and the wind blows toward the solder sheet body from the air duct, so that the excess flux droplets that have not adhered to the solder sheet body after being sprayed out from the atomizing nozzle are guided by the wind blown out from the air duct of multiple preheating mechanisms to the solder sheet body at the front end of the coating tube, which prolongs the impact contact time between the flux droplets and the solder sheet body, and uses the residual heat of the flux droplets to preheat and preliminarily spray the solder sheet body, reducing the difference between the temperature of the solder sheet body when it moves to the atomizing nozzle and the temperature of the flux droplets sprayed from the atomizing nozzle, thereby improving the combination rate of the flux spray and the solder sheet body, avoiding problems such as flux waste and low coating efficiency, and improving the spraying quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a flux coating device for solder sheet of the present invention;

[0024] Figure 2 A cross-sectional view of an embodiment of a flux coating device for solder sheets of the present invention;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 A cross-sectional view of a coating barrel of an embodiment of a flux coating device for solder sheets of the present invention;

[0027] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0028] Figure 6 It is a schematic diagram of a driving mechanism and a rotating column of an embodiment of a flux coating device for solder sheets of the present invention;

[0029] Figure 7 The cross-sectional view is of a rotating column and a storage tank of an embodiment of a flux coating device for solder sheets of the present invention.

[0030] In the figure: 100, solder sheet body; 200, coating cylinder; 300, rotating column; 310, atomizing nozzle; 320, hose; 400, storage tank; 410, slip ring; 420, injection pipe; 430, injection valve; 510, drive ring; 520, drive motor; 530, drive wheel; 600, extrusion convex strip; 710, air duct; 720, air supply ring. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] An embodiment of a flux coating device for solder sheet of the present invention is as follows Figures 1 to 7 As shown: a flux coating device for solder sheets, including a coating cylinder 200, a driving mechanism, and an extrusion mechanism.

[0033] The coating cylinder 200 is arranged at the front and rear of the axis; a rotating column 300 is arranged at the rear end of the coating cylinder 200; the rotating column 300 is coaxially rotatably installed in the coating cylinder 200; a through hole is arranged at the axis of the rotating column 300; a conveying mechanism is arranged at the front end of the coating cylinder 200; the conveying mechanism drives the solder sheet body 100 to move from front to back; the conveying mechanism is selected according to the shape of the solder sheet body 100; when the solder sheet body 100 is in the shape of a wire strip, the conveying mechanism includes two symmetrically arranged conveying rollers; the conveying rollers clamp the solder sheet body 100 and drive the solder sheet body 100 to move by rotating; when the solder sheet body 1 When the solder sheet 100 is in sheet form, the conveying mechanism includes a conveyor belt; the solder sheet body 100 is placed on the conveyor belt, and the conveyor belt is driven to move forward and backward; the solder sheet body 100 is inserted into the coating cylinder 200 from the front end thereof, moves backward, and passes through the through hole to detach from the coating cylinder 200; a plurality of atomizing nozzles 310 uniformly distributed along the circumference of the rotating cylinder 300 are provided at the front end of the rotating cylinder 300; the spray direction of the atomizing nozzle 310 is tilted forward and backward, and faces the axis of the rotating cylinder 300; an annular groove is provided on the circumferential side wall of the rotating cylinder 300; the opening of the groove faces the inner wall of the coating cylinder 200, and is coaxial with the rotating cylinder 300.

[0034] A hose 320 is arranged in the groove, and the hose 320 is provided in multiple numbers and evenly distributed along the circumference of the rotating column 300. The front end of the hose 320 passes through the rotating column 300 and is connected to the atomizing nozzle 310, and a storage component is provided at the rear end. The storage component is used to store the flux liquid and supply the flux liquid to the hose 320. The storage component includes an annular storage tank 400. The storage tank 400 is coaxial with the rotating column 300. The storage tank 400 is fixed at the rear end of the rotating column 300. The storage tank 400 is connected to the rear end of the hose 320. The high-temperature flux liquid is injected into the storage tank 400. An injection structure is provided in the storage tank 400. The injection structure is used to inject the flux liquid into the storage tank 400 and prevent air from flowing into the atomizing nozzle 310 along with the flux liquid, thereby affecting the atomization effect of the atomizing nozzle 310. The injection structure includes a slip ring 410; the slip ring 410 is arranged in the storage tank 400 to slide forward and backward; the slip ring 410 divides the storage tank 400 into a front cavity and a rear cavity; the front cavity is connected to the hose 320, and the rear cavity is connected to the outside atmosphere; an injection pipe 420 is arranged at the rear side of the slip ring 410; the injection pipe 420 is arranged front and back, the front end is fixed on the slip ring 410 and is connected to the front cavity, and the rear end passes through the rear cavity and extends to the outside of the coating cylinder 200; the injection pipe 420 and the storage tank 400 are slidably matched; an injection valve 430 is installed at the rear end of the injection pipe 420. When the flux liquid needs to be injected, the slip ring 410 is at the front end of the storage tank 400; after the outlet of the external syringe is connected to the injection pipe 420, the injection valve 430 is opened, and the flux liquid enters the front cavity. As the flux liquid enters, the slip ring 410 moves backward, thereby avoiding the presence of air in the front cavity. After the injection is completed, the injection valve 430 is closed and the syringe is unplugged. During spraying, the protruding strip 600 and the groove wall squeeze the hose 320, driving the flux liquid in the hose 320 to creep toward the atomizing nozzle 310, forming a negative pressure at the rear end of the hose 320, sucking the flux liquid in the front cavity of the storage tank 400 into the hose 320, and the slip ring 410 moves forward accordingly.

[0035] The driving mechanism is used to drive the rotating column 300 to rotate; the flux mist droplets sprayed by the atomizing nozzle 310 are sprayed toward the solder sheet body 100 and rotate around the solder sheet body 100, so that the flux mist droplets are uniformly adhered to the surface of the solder sheet body 100. The driving mechanism includes a driving ring 510 and a driving motor 520; the driving ring 510 is sleeved on the outside of the storage tank 400 and fixed on the inner wall of the coating cylinder 200; the driving motor 520 is fixed on the storage tank 400, and a driving wheel 530 is fixed on the output end of the driving motor 520; the driving wheel 530 and the driving ring 510 are meshed for transmission. The driving motor 520 drives the rotating column 300 to rotate through the driving ring 510 and the driving wheel 530.

[0036] The extrusion mechanism is arranged in the groove, and is used to clamp the hose 320 and drive the high-temperature flux liquid in the hose 320 to creep toward the atomizing nozzle 310, so that the amount of flux liquid delivered to each atomizing nozzle 310 is the same, and when the atomizing nozzle 310 is blocked, the extrusion mechanism clamps the hose 320 toward the atomizing nozzle 310, so that the hydraulic pressure of the flux liquid in the atomizing nozzle 310 is increased, and the high-temperature flux liquid assists the solidified flux in the atomizing nozzle 310 to re-melt, so that the high-pressure flux liquid dredges the atomizing nozzle 310, so that the flux spraying amount at each atomizing nozzle 310 is uniform, thereby improving the flux coating effect.

[0037] The extrusion mechanism includes an extrusion rib 600; a plurality of extrusion ribs 600 are provided and evenly distributed along the circumference of the coating cylinder 200; the extrusion rib 600 is fixed on the inner wall of the coating cylinder 200; and the extrusion rib 600 abuts against the groove wall of the groove. When the driving mechanism drives the rotating column 300 to rotate, the extrusion rib 600 and the groove wall of the groove squeeze the hose 320, driving the flux liquid in the hose 320 to creep toward the atomizing nozzle 310, so that negative pressure is formed at the rear end of the hose 320, so that the flux liquid in the storage component is sucked into the hose 320, so that the atomizing nozzle 310 continuously sprays flux droplets.

[0038] In this embodiment, a preheating mechanism is provided at the front side of the rotating column 300; the preheating mechanism is used to preheat and preliminarily spray the solder sheet body 100, improve the spraying efficiency, improve the spraying quality, and reduce the flux waste or recycling process. There are multiple preheating mechanisms distributed front and back along the axis of the coating cylinder 200. The preheating mechanism includes an air duct 710 and an air supply ring 720.

[0039] There are multiple air ducts 710, which are evenly distributed along the circumference of the coating cylinder 200; the air ducts 710 are tilted front and back and face the axis of the rotating column 300; the air supply ring 720 is coaxially fixed on the outer wall of the coating cylinder 200; the air supply ring 720 has a hollow annular air supply cavity inside; the air supply cavity is connected to the air duct 710; the air supply cavity is provided with an air injection port; the air injection port is connected to the fan through a pipeline. The fan blows air into the air supply chamber, and the air blows from the air duct 710 to the solder sheet body 100, so that the excess flux droplets that are not attached to the solder sheet body 100 after being sprayed at the atomizing nozzle 310 are directed to the solder sheet body 100 at the front end of the coating cylinder 200 through the air duct 710 of the multiple preheating mechanisms, thereby extending the impact contact time between the flux droplets and the solder sheet body 100, and using the residual heat of the flux droplets to preheat and preliminarily spray the solder sheet body 100, thereby reducing the difference between the temperature of the solder sheet body 100 when it moves to the atomizing nozzle 310 and the temperature of the flux droplets sprayed from the atomizing nozzle 310, thereby improving the spraying quality and efficiency. An electric heating wire is provided in the air supply chamber, so that hot air is blown out through the air duct 710, thereby improving the preheating effect on the solder sheet body 100.

[0040] In combination with the above embodiments, the use principle and working process of the present invention are as follows: when in use, the conveying mechanism drives the solder sheet body 100 to move from front to back; the solder sheet body 100 is inserted into the coating cylinder 200 from the front end and moves backward, and passes through the through hole to detach from the coating cylinder 200; the driving motor 520 drives the rotating column 300 to rotate through the driving ring 510 and the driving wheel 530. When the rotating column 300 rotates, the protruding strip 600 and the groove wall of the groove squeeze the hose 320, driving the flux liquid in the hose 320 to creep toward the atomizing nozzle 310, so that negative pressure is formed at the rear end of the hose 320, and the flux liquid in the front cavity of the storage tank 400 is sucked into the hose 320, so that the atomizing nozzle 310 continuously sprays flux droplets. The fan blows air into the air supply chamber, and the wind blows toward the solder sheet body 100 from the air duct 710, so that the excess flux droplets that have not adhered to the solder sheet body 100 after being sprayed from the atomizing nozzle 310 are guided by the wind blown out of the air duct 710 of the multiple preheating mechanisms to the solder sheet body 100 at the front end of the coating cylinder 200, thereby extending the impact contact time between the flux droplets and the solder sheet body 100, and utilizing the residual heat of the flux droplets to preheat and preliminarily spray the solder sheet body 100, thereby reducing the difference between the temperature of the solder sheet body 100 when it moves to the atomizing nozzle 310 and the temperature of the flux droplets sprayed from the atomizing nozzle 310, thereby increasing the bonding rate of the flux spray and the solder sheet body 100, avoiding problems such as flux waste and low coating efficiency, and improving the spraying quality and efficiency. The rotating column 300 drives the atomizing nozzle 310 to rotate, so that the flux mist droplets sprayed by the atomizing nozzle 310 are sprayed toward the solder sheet body 100 and rotate around the solder sheet body 100, so that the flux mist droplets are evenly adhered to the surface of the solder sheet body 100.

[0041] When the atomizing nozzle 310 is blocked, the convex strip 600 is extruded to clamp the hose 320, thereby increasing the hydraulic pressure of the flux liquid in the atomizing nozzle 310. The high-temperature flux liquid assists the solidified flux in the atomizing nozzle 310 to re-melt, so that the high-pressure flux liquid can clear the atomizing nozzle 310, making the flux spraying amount at each atomizing nozzle 310 uniform and consistent, thereby improving the flux coating effect.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flux coating device for solder sheets, characterized in that: It includes a coating cylinder, a driving mechanism, and an extrusion mechanism; The coating cylinder axis is arranged front and back; a rotating column is arranged at the rear end of the coating cylinder; the rotating column is coaxially rotatably installed in the coating cylinder; a through hole is arranged at the axis of the rotating column; the solder sheet body is inserted into the coating cylinder from the front end of the coating cylinder and moves backward, and passes through the through hole to detach from the coating cylinder; a plurality of atomizing nozzles are arranged at the front end of the rotating column and are evenly distributed along the circumference of the rotating column; the spray direction of the atomizing nozzle is arranged to be inclined front and back and toward the axis of the rotating column; an annular groove is arranged on the circumferential side wall of the rotating column; the opening of the groove faces the inner wall of the coating cylinder and is coaxial with the rotating column; The groove is provided with hoses arranged in front and back; there are multiple hoses, which are evenly distributed along the circumference of the rotating column; the front end of the hose passes through the rotating column and is connected to the atomizing nozzle, and a storage component is provided at the rear end; the storage component includes an annular storage tank fixed at the rear end of the rotating column; the storage tank and the rotating column are coaxial; the storage tank is connected to the rear end of the hose, and a high-temperature flux solution is injected into the storage tank; the storage component is used to store the flux solution and supply the flux solution to the hose; a preheating mechanism for preheating and preliminarily spraying the solder sheet body is provided on the front side of the rotating column, and the preheating mechanism includes an air duct and an air supply ring; multiple air ducts are arranged along the circumference of the coating cylinder The air duct is arranged tilted forward and backward and faces the axis of the rotating column; the air supply ring is coaxially fixed on the outer wall of the coating cylinder; the air supply cavity is hollow and annular inside the air supply ring; the air supply cavity and the air duct are connected, so that the excess flux droplets that are not attached to the solder sheet body after being sprayed from the atomizing nozzle are guided to the solder sheet body at the front end of the coating cylinder by the air blown out of the air duct of the preheating mechanism; the driving mechanism is used to drive the rotating column to rotate; the extrusion mechanism includes a plurality of extrusion convex strips uniformly distributed along the circumference of the coating cylinder; the extrusion convex strips are fixed on the inner wall of the coating cylinder; the extrusion convex strips abut against the groove wall of the groove; The extrusion mechanism is arranged in the groove, and is used for squeezing the hose and driving the soldering flux liquid in the hose to creep toward the atomizing nozzle. When the atomizing nozzle is blocked, the hydraulic pressure of the soldering flux liquid in the atomizing nozzle is increased.

2. A flux coating device for solder sheets according to claim 1, characterized in that: The driving mechanism includes a driving ring and a driving motor; the driving ring is sleeved on the outside of the storage tank and fixed on the inner wall of the coating cylinder; the driving motor is fixed on the storage tank, and a driving wheel is fixed on the output end of the driving motor; the driving wheel and the driving ring are meshed for transmission.

3. The flux coating device for solder sheet according to claim 1, characterized in that: An injection structure is provided in the storage tank; the injection structure is used to inject soldering flux liquid into the storage tank and prevent air from flowing into the atomizing nozzle along with the soldering flux liquid.

4. A flux coating device for solder sheets according to claim 3, characterized in that: The injection structure includes a slip ring; the slip ring is slidably arranged in the storage tank; the slip ring divides the storage tank into a front cavity and a rear cavity; the front cavity is connected to a hose, and the rear cavity is connected to the outside atmosphere; an injection pipe is arranged on the rear side of the slip ring; the injection pipe is arranged front and back, the front end of the injection pipe is fixed on the slip ring and connected to the front cavity, and the rear end passes through the rear cavity and extends to the outside of the coating cylinder; the injection pipe and the storage tank are slidably matched; an injection valve is installed at the rear end of the injection pipe.

5. The flux coating device for solder sheet according to claim 1, characterized in that: A plurality of preheating mechanisms are provided; the air supply cavity is provided with an air injection port; the air injection port is connected with the fan through a pipeline.

6. A solder flux coating device for solder sheets according to claim 5, characterized in that: There are multiple preheating mechanisms distributed front and back along the axis of the coating cylinder.

7. A solder flux coating device for solder sheets according to claim 6, characterized in that: An electric heating wire is arranged in the air supply cavity.

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