Device for controlling oxygen concentration at inlet and outlet of reflow soldering and vacuum reflow soldering

Abstract

The utility model discloses an inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering, which is mounted at an inlet and an outlet of an equipment product for sealing, so as to prevent and isolate the oxygen content change of the reflow soldering and vacuum reflow soldering equipment caused by product transportation, and effectively reduce the protective gas consumption of the whole equipment. The tray is driven by the conveyor belt structure to move from the inlet at one end of the cavity to the outlet at the other end; a sealing ring is arranged on the side face, corresponding to the cavity wall, of the gate, an air cylinder is movably arranged between the lower end of the gate and the cavity, and the two ends of the gate are movably arranged in upper limiting guide strips on the side wall of the cavity in a matched mode. The distance between the lower limiting guide strip and the upper limiting guide strip is gradually reduced from bottom to top, so that the sealing ring can be tightly pressed when the gate is closed; the device can be widely applied to the field of SMT and semiconductor chip welding.

Description

Technical Field

[0001] This utility model relates to an inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering, belonging to the field of SMT and semiconductor chip soldering technology. Background Technology

[0002] With the development of SMT and semiconductor technologies, electronic technology is moving towards higher power, higher density, and greater integration, placing higher and more comprehensive reliability demands on the packaging and soldering of high-power devices. Current reflow soldering and vacuum reflow soldering methods are not perfect in controlling the oxygen concentration at the inlet and outlet. Large amounts of oxygen are introduced when products enter and exit the furnace, or imbalances in the furnace gas pressure can disrupt the oxygen atmosphere at the inlet and outlet, causing changes in the oxygen concentration inside the furnace. This can oxidize the products and affect their stability. It is necessary to introduce large amounts of nitrogen or other oxygen-free gases into the furnace, which requires a significant amount of gas to stabilize the oxygen concentration inside the furnace. Utility Model Content

[0003] This invention overcomes the shortcomings of existing technologies and provides an oxygen concentration control device for the inlet and outlet of reflow soldering and vacuum reflow soldering equipment. It is installed at the product inlet and outlet of the equipment for sealing and controls the product conveying part at the inlet and outlet of the reflow soldering and vacuum reflow soldering equipment. This prevents and isolates the oxygen content changes caused by product conveying in the reflow soldering and vacuum reflow soldering equipment, and also effectively reduces the protective gas consumption of the entire equipment.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering, comprising a cavity, a flange, and a gate. The cavity has a through-open structure at both ends, and a gate is movably provided on both ends of the cavity opening side. The two ends are respectively the inlet and the outlet. A drive rod is provided in the cavity in a direction perpendicular to the through-opening. Both ends of the drive rod are movably provided on the side wall of the cavity. A sprocket is provided at both ends of the drive rod. A chain is provided on the sprocket. The two chains form a parallel and horizontally positioned conveyor belt structure in the cavity through an auxiliary rod and an auxiliary sprocket. A tray is suspended on the upper side of the conveyor belt structure formed by the two chains. The tray moves from one end of the cavity inlet to the other end outlet under the drive of the conveyor belt structure. One end of the drive rod extends through the cavity and out to the outside of the cavity, and is poweredly connected to a drive motor fixed to the outside of the cavity.

[0005] The cavity is provided with a flange that communicates with the outside of the cavity. The flange is used to communicate with the gas distribution plate or pump body so as to extract or discharge gas from the cavity.

[0006] A sealing ring is provided on the side of the cavity wall corresponding to the gate. A cylinder is movably arranged between the lower end of the gate and the cavity. The cylinder is used to drive the gate to open and close. The two ends of the gate are matched and movably arranged in the upper limit guide strip on the side wall of the cavity. A lower limit guide strip is provided outside the upper limit guide strip. An installation block is matched and arranged inside the lower limit guide strip. The installation block is fixedly arranged on the gate. The distance between the lower limit guide strip and the upper limit guide strip gradually decreases from bottom to top, so that the gate can press the sealing ring tightly when it is closed.

[0007] Furthermore, a sealing cover is movably provided on the top of the cavity. One end of the sealing cover is hinged to the cavity, and the other end of the sealing cover can be manually engaged with the cavity to facilitate opening the sealing cover.

[0008] Furthermore, a guide rod and an amplitude-adjusting screw are movably arranged in the cavity in a direction parallel to the drive rod. Each end of the guide rod and the amplitude-adjusting screw has a vertical plate. The chain and sprocket are located between the two vertical plates, and the sprocket can slide along the drive rod. Both ends of the guide rod are movably arranged on the vertical plates. The amplitude-adjusting screw is movably arranged on the vertical plates via a threaded structure. One end of the amplitude-adjusting screw passes through the vertical plate and the cavity and is poweredly connected to an amplitude-adjusting power structure fixedly arranged outside the cavity. The distance between the two vertical plates is adjusted by driving the amplitude-adjusting screw to rotate.

[0009] Furthermore, a support is provided at the bottom of the cavity, the cylinder body is movably mounted on the support, and the piston rod of the cylinder is movably mounted on the gate.

[0010] Furthermore, both the gate and the mounting block are respectively set by pulleys inside the lower limit guide bar outside the upper limit guide bar.

[0011] Furthermore, the upper limit guide bar is provided with a lower limit guide bar on its outer side, and both the upper and lower ends are provided with arcs.

[0012] Compared with the prior art, the advantages of this utility model are as follows: By setting an oxygen concentration control device at the inlet and outlet of reflow soldering and vacuum reflow soldering, this utility model solves the problem of a large amount of oxygen being introduced when products enter and exit the furnace. It isolates the connection between the inside of the furnace and the outside atmosphere, prevents oxygen-containing gas from entering the furnace and disrupting the gas environment, eliminates the need to fill the furnace with large amounts of nitrogen or other oxygen-free inert gases to resist the entry of oxygen at the inlet and outlet, reduces gas consumption, lowers gas usage costs, and makes the oxygen concentration inside the furnace easier to control and maintain stability. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 .

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 4 .

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 5 .

[0019] Figure 6 This is a three-dimensional structural diagram of the gate in this utility model.

[0020] In the diagram: 1 is the cavity, 2 is the sealing cover, 3 is the flange, 4 is the gate, 5 is the upper limit guide bar, 6 is the lower limit guide bar, 7 is the cylinder, 8 is the sealing ring, 9 is the drive rod, 10 is the guide rod, 11 is the amplitude adjustment screw, 12 is the chain, 13 is the sprocket, 14 is the upright plate, 15 is the drive motor, 16 is the tray, 17 is the mounting block, 18 is the bracket, and 19 is the pulley. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments.

[0022] like Figures 1-6As shown, this utility model discloses an inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering, comprising a cavity 1, a flange 3, and a gate 4. The cavity 1 has a through-hole structure at both ends, and a gate 4 is movably disposed on both ends of the cavity 1, which are the inlet and outlet, respectively. A sealing cover 2 is movably disposed on the top of the cavity 1. One end of the sealing cover 2 is hinged to the cavity 1, and the other end of the sealing cover 2 can be manually engaged with the cavity 1 for easy opening. A drive rod 9 is disposed inside the cavity 1 perpendicular to the through-hole, and both ends of the drive rod 9 are movably disposed on the side wall of the cavity 1. A sprocket 13 is disposed on both ends of the drive rod 9, and a chain 12 is disposed on the sprocket 13. The two chains 12 form a parallel and horizontally positioned conveyor belt structure in the cavity 1 through an auxiliary rod and an auxiliary sprocket. A support is suspended on the upper side of the conveyor belt structure formed by the two chains 12. The tray 16 moves from one end of the cavity 1 to the other end of the cavity 1 under the drive of the conveyor belt structure. One end of the drive rod 9 extends through the cavity 1 and out to the outside of the cavity 1, and is powered by the drive motor 15 fixed to the outside of the cavity 1. A guide rod 10 and an amplitude adjusting screw 11 are movably arranged in the cavity 1 in a direction parallel to the drive rod 9. Both ends of the guide rod 10 and the amplitude adjusting screw 11 are provided with upright plates 14. The chain 12 and the sprocket 13 are located between the two upright plates 14, and the sprocket 13 can slide along the drive rod 9. Both ends of the guide rod 10 are movably arranged on the upright plates 14. The amplitude adjusting screw 11 is movably arranged on the upright plates 14 through a threaded structure. One end of the amplitude adjusting screw 11 passes through the upright plate 14 and the cavity 1 and is powered by the amplitude adjusting power structure fixed to the outside of the cavity 1. The distance between the two upright plates 14 is adjusted by driving the amplitude adjusting screw 11 to rotate.

[0023] The cavity 1 is provided with a flange 3 that communicates with the outside of the cavity 1. The flange 3 is used to communicate with the gas distribution plate or pump body so as to extract or discharge the gas in the cavity 1.

[0024] A sealing ring 8 is provided on the side of the cavity 1 corresponding to the gate 4. A cylinder 7 is movably arranged between the lower end of the gate 4 and the cavity 1. The cylinder 7 is used to drive the gate 4 to open and close. The two ends of the gate 4 are matched and movably arranged in the upper limit guide strip 5 on the side wall of the cavity 1. A lower limit guide strip 6 is provided on the outside of the upper limit guide strip 5. An installation block 17 is matched and arranged in the lower limit guide strip 6. The installation block 17 is fixedly arranged on the gate 4. The distance between the lower limit guide strip 6 and the upper limit guide strip 5 gradually decreases from bottom to top, so that the gate 4 can press the sealing ring 8 when closed.

[0025] A bracket 18 is provided at the bottom of the cavity 1, the cylinder body of the cylinder 7 is movably mounted on the bracket 18, and the piston rod of the cylinder 7 is movably mounted on the gate 4; the gate 4 and the mounting block 17 are both correspondingly mounted on the upper limit guide bar 5 and the lower limit guide bar 6 are provided on the outside of the upper limit guide bar 5 via pulleys 19; the upper and lower ends of the lower limit guide bar 6 are both provided with arcs.

[0026] This utility model includes a cavity part, an inlet and outlet sealing part, a product conveying part, and a gas extraction or discharge part.

[0027] In this utility model, the cavity part is not limited in size, appearance and position, and has a detachable or non-detachable sealing cover 2 and a gas extraction or discharge part connecting flange 3, wherein the connection method is not limited to flange or welding.

[0028] In this utility model, the inlet and outlet sealing part is a sealing device with no limitation on its sealing method. The sealing device consists of a gate 4 (or a similar opening and closing sealing method), an upper limit guide bar 5, a lower limit guide bar 6, a cylinder 7, and a sealing ring 8. The sealing ring 8 is installed on the gate 4 near the cavity side and connected to the cylinder 7 (or other movement method). When the cylinder 7 works, it lifts the gate 4, and under the action of the upper limit guide bar 5 and the lower limit guide bar 6, it tightly adheres to the cavity to achieve the sealing effect.

[0029] In this invention, the product conveying section consists of a drive rod 9, a guide rod 10, an amplitude-adjusting screw 11, a chain 12, a sprocket 13, a vertical plate 14, a fiber optic sensor, and a drive motor. The drive rod 9, chain 12, sprocket 13, vertical plate 14, and drive motor enable automated feeding and discharging of the product within the cavity. The guide rod 10 and amplitude-adjusting screw 11 allow the cavity to accommodate products of different sizes. The fiber optic sensor confirms the product position, increasing operational stability. The chain 12 and sprocket 13 can also be replaced by other transmission structures, including belts and pulleys.

[0030] In this invention, the gas extraction or discharge section can be implemented using a vacuum pump or other methods to extract or discharge gas from the cavity. After the gas is discharged, nitrogen or other oxygen-free inert gases are filled into the cavity to prevent product oxidation and damage to the internal gas environment of the furnace.

[0031] This invention is not limited to any particular installation location. The device operates as follows: the inlet-side seal opens, the product enters and its position is confirmed by a fiber optic sensor, then the inlet-side seal closes, sealing the cavity. Afterwards, internal oxygen is extracted or discharged and nitrogen or other oxygen-free inert gases are added. Once this process is complete, the outlet-side seal opens, the product moves out of the cavity, and the outlet-side seal closes. This isolates the furnace interior from the external atmosphere, preventing oxygen-containing gases from entering the furnace and disrupting the gaseous environment.

[0032] This utility model mainly uses a device cavity, which is not limited by its appearance, size, position, or method of extracting internal gas, to seal the product inlet and outlet parts. It controls the product conveying part at the inlet and outlet of reflow soldering and vacuum reflow soldering equipment. The purpose is to extract or discharge oxygen inside the equipment in advance, prevent and isolate oxygen from contacting the furnace due to product conveying at the inlet and outlet of reflow soldering and vacuum reflow soldering equipment, thereby preventing and isolating changes in oxygen content caused by product conveying in reflow soldering and vacuum reflow soldering equipment. At the same time, it can also effectively reduce the protective gas consumption of the entire equipment.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering, characterized in that, The device includes a cavity (1), a flange (3), and a gate (4). The cavity (1) has a through-open structure at both ends, and a gate (4) is movably provided at both ends of the cavity (1). The two ends are the inlet and the outlet, respectively. A drive rod (9) is provided in the cavity (1) in a direction perpendicular to the through-open. Both ends of the drive rod (9) are movably provided on the side wall of the cavity (1). Both ends of the drive rod (9) are provided with sprockets (13). A chain (12) is provided on the sprocket (13). The two chains (12) form a parallel and horizontal conveyor belt structure in the cavity (1) through an auxiliary rod and an auxiliary sprocket. One end of the drive rod (9) extends through the cavity (1) and out to the outside of the cavity (1), and is powered by a drive motor (15) fixed on the outside of the cavity (1). The cavity (1) is provided with a flange (3) that communicates with the outside of the cavity (1). The flange (3) is used to communicate with the gas distribution plate or pump body so as to extract or discharge the gas in the cavity (1). A sealing ring (8) is provided on the side of the cavity (1) wall corresponding to the gate (4). A cylinder (7) is movably provided between the lower end of the gate (4) and the cavity (1). The cylinder (7) is used to drive the gate (4) to open and close. The two ends of the gate (4) are matched and movably provided in the upper limit guide strip (5) on the side wall of the cavity (1). A lower limit guide strip (6) is provided on the outside of the upper limit guide strip (5). An installation block (17) is matched and provided in the lower limit guide strip (6). The installation block (17) is fixedly provided on the gate (4). The distance between the lower limit guide strip (6) and the upper limit guide strip (5) gradually decreases from bottom to top, so that the gate (4) can press the sealing ring (8) when it is closed.

2. The inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering according to claim 1, characterized in that, A sealing cover (2) is movably provided on the top of the cavity (1). One end of the sealing cover (2) is hinged to the cavity (1), and the other end of the sealing cover (2) can be manually snapped onto the cavity (1) to facilitate the opening of the sealing cover (2).

3. The inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering according to claim 1, characterized in that, Inside the cavity (1), a guide rod (10) and an amplitude adjustment screw (11) are movably arranged in a direction parallel to the drive rod (9). Both ends of the guide rod (10) and the amplitude adjustment screw (11) are provided with upright plates (14). The chain (12) and the sprocket (13) are located between the two upright plates (14), and the sprocket (13) can slide along the drive rod (9). Both ends of the guide rod (10) are movably arranged on the upright plates (14). The amplitude adjustment screw (11) is movably arranged on the upright plates (14) through a threaded structure. One end of the amplitude adjustment screw (11) passes through the upright plate (14) and the cavity (1) and is connected to the amplitude adjustment power structure fixedly arranged outside the cavity (1). The distance between the two upright plates (14) is adjusted by driving the amplitude adjustment screw (11) to rotate.

4. The inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering according to claim 1, characterized in that, The bottom of the cavity (1) is provided with a bracket (18), the cylinder body of the cylinder (7) is movably mounted on the bracket (18), and the piston rod of the cylinder (7) is movably mounted on the gate (4).

5. The inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering according to claim 1, characterized in that, The gate (4) and the mounting block (17) are both set by pulleys (19) inside the lower limit guide bar (6) outside the upper limit guide bar (5).

6. The inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering according to claim 5, characterized in that, The upper limit guide bar (5) is provided with a lower limit guide bar (6) with arcs at both the upper and lower ends.

7. The inlet and outlet oxygen concentration control device for reflow soldering and vacuum reflow soldering according to claim 1, characterized in that, A tray (16) is suspended on the upper side of the conveyor belt structure formed by the two chains (12). The tray (16) moves from one end of the cavity (1) to the other end of the cavity (1) under the drive of the conveyor belt structure.

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