Flux coating machine

Abstract

The utility model discloses a solder flux coating machine, including a shell, a conveying mechanism and a coating mechanism, a working chamber is formed inside the shell, and the working chamber has a feed port and a discharge port arranged relatively; the conveying mechanism is arranged in the working chamber, and includes a pulley structure and a first driving member drivingly connected to the pulley structure, so as to drive the pulley structure to drive the workpiece to move from the feed port to the discharge port; the coating mechanism includes a spray plate, a storage box and a pumping device, the spray plate is arranged between the feed port and the discharge port, and a plurality of spray ports that can be aligned with the workpiece on the pulley structure are opened on the surface of the spray plate, the storage box is connected to the spray port, and the pumping device is connected to the storage box. The technical solution of the utility model is not affected by the moving speed of the PCB board, and can evenly and comprehensively coat the PCB board with solder flux.

Description

Technical Field

[0001] The utility model relates to the technical field of wave soldering, in particular to a flux coating machine. Background Art

[0002] Wave soldering is a common electronic assembly process, mainly used to solder electronic components on PCB boards. Its working principle is to spray the molten solder (lead-tin alloy) into a solder wave of the design requirements through an electric pump or electromagnetic pump, so that the PCB board pre-installed with components passes through the solder wave to achieve the mechanical and electrical connection between the component soldering end or pin and the printed circuit board pad.

[0003] Before wave soldering, the PCB board needs to be coated with flux. The existing flux coating device generally sprays the moving PCB board with a reciprocating flux nozzle. This method is prone to uneven and incomplete spraying during mass production and when the PCB board moves too fast. Utility Model Content

[0004] The main purpose of the utility model is to provide a soldering flux coating machine, which is not affected by the moving speed of a PCB board and can evenly and comprehensively coat the PCB board with soldering flux.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a soldering flux coating machine, comprising

[0006] A shell, wherein a working chamber is formed inside the shell, and the working chamber has a feed inlet and a discharge outlet arranged opposite to each other;

[0007] A conveying mechanism, the conveying mechanism is arranged in the working chamber, and comprises a pulley structure and a first driving member drivingly connected to the pulley structure, so as to drive the pulley structure to drive the workpiece to move from the feed port to the discharge port;

[0008] The coating mechanism includes a spray plate, a storage box and a pumping device. The spray plate is arranged between the feed port and the discharge port, and a plurality of spray ports that can be aimed at the workpiece on the pulley structure are opened on the surface of the spray plate. The storage box is connected to the spray port, and the pumping device is connected to the storage box.

[0009] In one embodiment of the utility model, the spray plate has a length direction and a width direction, and a plurality of the spray ports are equidistantly arranged on the surface of the spray plate along the length direction to form a spray port group, and a plurality of the spray port groups are equidistantly arranged on the surface of the spray plate along the width direction.

[0010] In an embodiment of the present invention, the spraying ports of any two adjacent spraying port groups are arranged in a staggered manner.

[0011] In an embodiment of the present invention, the spray port is a strip-shaped hole, and both ends of the strip-shaped hole extend along the length direction.

[0012] In an embodiment of the present invention, the pulley structure includes two movable frames arranged at an interval, a plurality of transmission wheels are arranged opposite to each other on the two movable frames, and a transmission belt is arranged on the transmission wheels.

[0013] In an embodiment of the present invention, the two movable frames are further connected with a threaded rod, and the threaded rod is drivingly connected with a second driving member to adjust the distance between the two movable frames.

[0014] In one embodiment of the utility model, an air suction device is provided on the top of the working chamber.

[0015] The technical solution of the utility model is to set a spray plate in the working chamber, and the spray plate is provided with a plurality of strip spray ports arranged in an array. The flux will be sprayed out evenly from the plurality of spray ports. When the PCB board passes over the spray plate, the flux will be evenly and comprehensively coated on the PCB board. Compared with the traditional method of using a nozzle to move back and forth for coating, this solution can achieve a better coating effect. No matter how fast the PCB board moves, the flux can be evenly and comprehensively coated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 Another cross-sectional view of the utility model;

[0020] Figure 4 It is a schematic diagram of the coating mechanism of the present utility model.

[0021] Description of Figure Numbers:

[0022] 1. Shell; 2. Working chamber; 21. Feed inlet; 22. Discharge outlet; 23. Suction device; 3. Conveying mechanism; 4. Pulley structure; 41. Movable frame; 42. Transmission wheel; 43. Transmission belt; 44. Screw rod; 45. Second driving member; 6. Coating mechanism; 7. Spray plate; 71. Spray port; 72. Spray port group; 8. Storage box; 9. Pumping device.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] Reference Figures 1 to 4 The utility model proposes a flux coating machine, including a shell 1, a conveying mechanism 3 and a coating mechanism 6. A working chamber 2 is formed inside the shell 1, and the working chamber 2 has a feed port 21 and a discharge port 22 arranged opposite to each other; the conveying mechanism 3 is arranged in the working chamber 2, including a pulley structure 4 and a first driving member drivingly connected to the pulley structure 4, so as to drive the pulley structure 4 to drive the workpiece to move from the feed port 21 to the discharge port 22; the coating mechanism 6 includes a spray plate 7, a storage box 8 and a pumping device 9, the spray plate 7 is arranged between the feed port 21 and the discharge port 22, and a plurality of spray ports 71 that can be aimed at the workpiece on the pulley structure 4 are opened on the surface of the spray plate 7, the storage box 8 is connected to the spray port 71, and the pumping device 9 is connected to the storage box 8.

[0026] It can be understood that the feed port 21 and the discharge port 22 are respectively located on both sides of the shell 1. The conveying mechanism 3 is used to drive the PCB board to move so that it enters the working chamber 2 from the feed port 21 and then leaves the working chamber 2 from the discharge port 22. The conveying mechanism 3 is composed of a pulley structure 4 and a first driving member that provides power. In this example, the first driving member is a servo motor. The coating mechanism 6 is used to coat the PCB board with flux, and is composed of a storage box 8 for storing the flux, a pumping device 9 that provides power to make the flux flow, and a spray plate 7 with multiple spray ports 71 for spraying the flux. It should be noted that the spray plate 7 is located in the middle between the feed port 21 and the discharge port 22, and the height of the spray plate 7 is lower than the height of the PCB board on the pulley structure 4. The side of the spray plate 7 with the spray port 71 should also face the PCB board.

[0027] When the PCB board moves from the feed port 21 to the discharge port 22, the flux will be sprayed out from the multiple spray ports 71 of the spray plate 7. When the PCB board passes over the spray plate 7, the flux will be evenly and comprehensively coated on the PCB board. Compared with the traditional method of coating by moving the nozzle back and forth, this solution can achieve a better coating effect. No matter how fast the PCB board moves, the flux can be evenly and comprehensively coated.

[0028] Reference Figure 4 In one embodiment of the present application, the spray plate 7 has a length direction and a width direction, and a plurality of spray ports 71 are arranged equidistantly along the length direction on the surface of the spray plate 7 to form a spray port group 72, and a plurality of spray port groups 72 are arranged equidistantly along the width direction on the surface of the spray plate 7.

[0029] It can be understood that the spray plate 7 has a length direction AA and a width direction BB, and multiple spray outlets 71 are arranged equidistantly along the length direction AA and the width direction BB, forming an evenly distributed array of spray outlets 71 to achieve a more uniform coating effect. When the PCB board moves, it can also be fully coated without dead corners.

[0030] Reference Figure 4 In one embodiment of the present application, the spraying ports 71 of any two adjacent spraying port groups 72 are staggered with respect to each other.

[0031] It can be understood that the mutually staggered spray ports 71 can make the flux more evenly distributed on the PCB board. When the spray ports 71 spray the flux, the flux at the center of the spray ports 71 will be denser and the flux at the edge of the spray ports 71 will be relatively thinner. In order to avoid uneven distribution of the flux on the PCB board, the adjacent spray port groups 72 are staggered, which can effectively improve the above-mentioned problem and make the overall distribution of the flux on the PCB board more even.

[0032] Reference Figure 4 In one embodiment of the present application, the spray port 71 is a strip-shaped hole, and both ends of the strip-shaped hole extend along the length direction.

[0033] It can be understood that setting the spray port 71 in a strip shape can, on the one hand, make the flux spray coverage area wider, and on the other hand, the strip-shaped outlet can also make the flux more uniform when spraying. Because the flux at the center of the circular hole-shaped spray port 71 will be denser when spraying flux, and the flux at the edge of the spray port 71 will be relatively thinner. In order to avoid the above situation, the spray port 71 is designed to be a strip shape, the outlet area is increased, and the flux will be sprayed more evenly.

[0034] Reference Figures 2 to 3In one embodiment of the present application, the pulley structure 4 includes two movable frames 41 spaced apart from each other, a plurality of transmission wheels 42 are disposed opposite to each other on the two movable frames 41 , and a transmission belt 43 is disposed on the transmission wheel 42 .

[0035] It can be understood that the edge of the PCB board is placed on the transmission belt 43, and the transmission belt 43 and the transmission wheel 42 cooperate with each other to transport the PCB board. This method has the following advantages: the transmission process is smooth, and the noise and vibration are reduced by using the flexible transmission belt 43 to transmit power, so that the movement process of the PCB board is smooth and quiet; it is easy to maintain. Compared with other transmission methods, the structure of this scheme is relatively simple and the maintenance cost is low. The replacement of the transmission wheel 42 and the transmission belt 43 is relatively easy, and no frequent lubrication or complicated maintenance work is required; the transmission efficiency is high. Under the condition of correct use and maintenance, the transmission efficiency of the pulley transmission can usually reach a high level.

[0036] Reference Figures 2 to 3 In one embodiment of the present application, the two movable frames 41 are further connected to a threaded rod 44 , and the threaded rod 44 is driven and connected to a second driving member 45 to adjust the distance between the two movable frames 41 .

[0037] It can be understood that the distance between the movable frames 41 can be changed by adjusting the screw rod 44. Since the sizes of PCB boards in different batches are also different, in order to enable all batches of PCB boards to be coated with flux, a screw rod 44 capable of adjusting the spacing between the movable frames 41 is added so that the edges of PCB boards of different sizes can be placed exactly on the transmission belt 43, thereby increasing the applicability of the equipment.

[0038] Reference Figures 2 to 3 In one embodiment of the present application, an air suction device 23 is provided on the top of the working chamber 2.

[0039] It is understandable that since the flux is a mixture of various chemical substances, some substances that pollute the environment or are harmful to the human body may be volatilized during the coating process. The suction device 23 can suck the gas in the working chamber 2 so that it will not enter the external environment, effectively preventing environmental pollution and protecting the health of the staff.

[0040] The technical solution of the utility model is to set a spray plate 7 in the working chamber 2, and the spray plate 7 is provided with a plurality of strip spray ports 71 arranged in an array. The flux will be sprayed out evenly from the plurality of spray ports 71. When the PCB board passes over the spray plate 7, the flux will be evenly and comprehensively coated on the PCB board. Compared with the traditional method of using a nozzle to move back and forth for coating, this solution can achieve a better coating effect. No matter how fast the PCB board moves, the flux can be evenly and comprehensively coated.

[0041] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the machine or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A flux coating machine, characterized in that: include A shell (1), wherein a working chamber (2) is formed inside the shell (1), and the working chamber (2) has a feed inlet (21) and a discharge outlet (22) arranged opposite to each other; A conveying mechanism (3), the conveying mechanism (3) being arranged in the working chamber (2), comprising a pulley structure (4) and a first driving member drivingly connected to the pulley structure (4), so as to drive the pulley structure (4) to drive the workpiece to move from the feed port (21) to the discharge port (22); A coating mechanism (6), the coating mechanism (6) comprising a spray plate (7), a storage box (8) and a pumping device (9), the spray plate (7) being arranged between the feed port (21) and the discharge port (22), and a plurality of spray ports (71) being arranged on the surface of the spray plate (7) and being capable of being aligned with a workpiece on the pulley structure (4), the storage box (8) being connected to the spray ports (71), and the pumping device (9) being connected to the storage box (8).

2. The flux coating machine according to claim 1, characterized in that: The spray plate (7) has a length direction and a width direction, and a plurality of the spray ports (71) are arranged equidistantly on the surface of the spray plate (7) along the length direction to form a spray port group (72), and a plurality of the spray port groups (72) are arranged equidistantly on the surface of the spray plate (7) along the width direction.

3. The flux coating machine according to claim 2, characterized in that: The spraying ports (71) of any two adjacent spraying port groups (72) are arranged in a staggered manner with respect to each other.

4. The flux coating machine according to claim 3, characterized in that: The spraying port (71) is a strip-shaped hole, and both ends of the strip-shaped hole extend along the length direction.

5. The flux coating machine according to claim 1, characterized in that: The pulley structure (4) comprises two movable frames (41) arranged at an interval, a plurality of transmission wheels (42) are arranged on the two movable frames (41) in a relative manner, and a transmission belt (43) is arranged on the transmission wheel (42).

6. The flux coating machine according to claim 5, characterized in that: The two movable frames (41) are also connected to a threaded rod (44), and the threaded rod (44) is drivingly connected to a second driving member (45) to adjust the distance between the two movable frames (41).

7. The flux coating machine according to any one of claims 1 to 6, characterized in that: An air suction device (23) is provided at the top of the working chamber (2).

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