Efficient reflow soldering furnace and process thereof

Abstract

This invention discloses a high-efficiency reflow oven and its process, including a base and a top seat fixedly installed on the base. The top seat is equipped with a hot air mechanism and further includes: a heating mechanism, which is installed on the base and includes a delivery platform, which is rotatably installed inside the base; and a feeding mechanism, which is installed on one side of the base. When the delivery platform approaches the feeding mechanism, the feeding mechanism can passively feed the material on it onto the delivery platform and automatically avoid it. This application places the material on the delivery platform, and driven by a servo motor, the delivery platform first rises to approach the highest temperature position at the top, and then descends, so that the material on it first heats up and then reaches the highest temperature position. After welding, it descends again to cool down. The heating mechanism greatly reduces the footprint of the entire system, thereby improving the utilization rate of space in the factory area.

Description

Technical Field

[0001] This invention relates to the field of reflow soldering technology, specifically to a high-efficiency reflow soldering furnace and its process. Background Technology

[0002] Reflow soldering equipment contains a heating circuit that heats air or nitrogen to a sufficiently high temperature and blows it onto the circuit board with components already attached, melting the solder on both sides of the components and bonding them to the motherboard. The advantages of this process are that the temperature is easy to control, oxidation can be avoided during soldering, and manufacturing costs are easier to control. In the existing reflow soldering process, reflow ovens are often equipped with preheating zones, welding zones, cooling zones, etc. The material plate enters the oven under the conveyor belt and passes through the preheating zone, welding zone, and cooling zone in sequence. The temperature changes by first rising to the highest temperature and then cooling down. However, due to the multiple areas of the preheating zone, welding zone, and cooling zone, the length of the entire oven is relatively long, which will occupy valuable internal space in the factory. Summary of the Invention

[0003] The purpose of this invention is to provide a high-efficiency reflow oven and its process to solve the problems mentioned in the background art.

[0004] The present invention is achieved by the following technical solution: a high-efficiency reflow oven, including a base and a top seat fixedly installed on the base, wherein a hot air mechanism is provided in the top seat, and further including: a heating mechanism, which is provided on the base and includes a delivery table, which is rotatably provided in the base; and a feeding mechanism, which is provided on one side of the base, and when the delivery table is close to the feeding mechanism, the feeding mechanism can passively feed the material on it onto the delivery table and automatically avoid it.

[0005] Preferably, the heating mechanism includes a servo motor fixedly installed on one side of the base, a connecting plate fixedly installed at the output end of the servo motor, a connecting shaft rotatably installed at the other end of the connecting plate, and the connecting shaft being fixedly connected to the delivery table.

[0006] Preferably, counterweights are fixedly installed at both ends of the bottom of the delivery station.

[0007] Preferably, the feeding mechanism includes a sliding plate slidably mounted on a base, and an abutment plate is fixedly mounted on the top of the sliding plate; The base is provided with a limiting groove and a sliding groove; A sliding rod is slidably installed on the limiting groove, a receiving frame is fixedly installed on the sliding rod, a telescopic rod is fixedly installed at one end of the sliding rod, a moving block is slidably installed on the sliding groove, and the telescopic rod slides through the moving block; A circuit board is provided on the receiving frame; One end of the receiving frame is provided with a notch; The bottom end of the receiving frame is fixedly installed with a base plate. After the abutment plate and the base plate come into contact, the receiving frame can be driven to open to both sides first and then move synchronously in the direction of the abutment plate.

[0008] Preferably, the base plate is provided with inclined grooves and flat grooves.

[0009] Preferably, a protrusion is fixedly installed at the bottom end of the slide bar, and the protrusion is disposed in a limiting groove, and the limiting groove is L-shaped.

[0010] Preferably, an extension plate is fixedly installed on the side wall of the receiving frame, a rotating shaft is rotatably installed on the extension plate, and a rotating rod is fixedly installed on the rotating shaft; A baffle plate and a switching plate are horizontally slidably installed on the receiving frame, and round bars are fixedly installed on both the baffle plate and the switching plate. Grooves are provided on both sides of the rotating rod, and the dimensions of the round bars and the grooves are matched. A friction plate is fixedly installed on the base, and the bottom end of the rotating shaft is in contact with the friction plate.

[0011] Preferably, the switching plate is provided with a chamfer.

[0012] Preferably, a connecting rod is fixedly installed on the base, and an abutment strip is fixedly installed on the connecting rod; A protruding plate is fixedly installed on the connecting shaft.

[0013] A high-efficiency reflow oven welding process, comprising the reflow oven described above, includes the following steps: S1. Place several circuit boards on the carrier frame and load them onto the delivery table through the carrier frame; S2. After the circuit board is loaded onto the delivery table, it will rise in the top seat as the delivery table rotates, thereby preheating and soldering, and then cooling and conveying it away. S3. After welding is completed, as the delivery table descends, the abutment bar will cooperate with the convex plate to make the delivery table rotate for tilted feeding. S4. The delivery station continues to rotate for the next round of loading and rises for reflow soldering.

[0014] By adopting the above technical solution, the reflow oven can reduce its footprint.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, by setting a heating mechanism on the base, the material is placed on the delivery table, and driven by the servo motor, the delivery table first rises to the top near the highest temperature position, and then falls down, so that the material on it first heats up and then reaches the highest temperature position. After welding, it falls down again to cool down. The heating mechanism greatly reduces the floor space of the entire mechanism, thereby improving the utilization rate of space in the factory area. Attached Figure Description

[0016] Figure 1 and Figure 2 All of these are three-dimensional structural schematic diagrams of the present invention; Figure 3 This is a partial structural schematic diagram of the convex plate of the present invention; Figure 4 This is a partial structural schematic diagram of the receiving frame of the present invention; Figure 5 This is a three-dimensional structural diagram of the present invention; Figure 6 This is a schematic diagram of the bottom part of the receiving frame of the present invention; Figure 7 For the present invention Figure 5 Schematic diagram of Part A; Figure 8 For the present invention Figure 4 A schematic diagram of part B of the structure.

[0017] In the diagram: 1. Base; 1.1. Limiting groove; 1.2. Slide groove; 2. Top seat; 31. Servo motor; 32. Connecting plate; 33. Delivery table; 34. Counterweight; 35. Connecting shaft; 36. Protruding plate; 37. Connecting rod; 38. Abutment strip; 41. Slide plate; 42. Receiving frame; 43. Baffle; 44. Base plate; 44.1. Inclined groove; 44.2. Flat groove; 45. Abutment plate; 46. Slide rod; 47. Telescopic rod; 48. Moving block; 49. Protrusion; 51. Extension plate; 52. Rotating shaft; 53. Block; 54. Switching plate; 55. Round bar; 56. Rotating rod; 57. Friction plate; 6. Circuit board. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-8The present invention provides a technical solution: a high-efficiency reflow oven, including a base 1 and a top seat 2 fixedly installed on the base 1. A hot air mechanism is provided in the top seat 2. The oven also includes a heating mechanism, which is installed on the base 1 and includes a delivery table 33, which is rotatably installed in the base 1. The feeding mechanism is located on one side of the base 1. When the delivery table 33 approaches the feeding mechanism, the feeding mechanism can passively feed the material on it onto the delivery table 33 and automatically avoid it.

[0020] In another embodiment of the present invention: the heating mechanism includes a servo motor 31 fixedly installed on one side of the base 1, a connecting plate 32 fixedly installed on the output end of the servo motor 31, a connecting shaft 35 rotatably installed on the other end of the connecting plate 32, and the connecting shaft 35 and the delivery table 33 are fixedly connected. When the servo motor 31 is started, it drives the connecting plate 32 to rotate. The connecting plate 32 then drives the delivery table 33 to rotate in a circle within the base 1. Relative to the top seat 2, the delivery table 33 will first approach the top and then move away from it. The hot air mechanism is located within the top seat 2 and blows hot air downwards from above. Therefore, as the delivery table 33 rotates, the material on it will first approach the hot air mechanism from a position away from it, and then move away from it. In existing reflow soldering processes, reflow ovens are often equipped with preheating zones, welding zones, cooling zones, etc. The material plate enters the furnace under the conveyor belt and passes through the preheating zone, welding zone, etc. The welding furnace consists of a preheating zone, a cooling zone, and a preheating zone. The temperature changes by first heating to the highest temperature and then cooling down. However, due to the multiple zones, the length of the welding furnace is quite long, which occupies valuable factory space. Therefore, in this application, a heating mechanism is installed on the base 1. The heating mechanism places the material on the delivery table 33, which is driven by the servo motor 31 to rise to the highest temperature position. Then it descends, allowing the material on it to heat up and reach the highest temperature position. After welding, it descends again to cool down. The heating mechanism greatly reduces the footprint of the entire mechanism, thereby improving the utilization rate of factory space.

[0021] In another embodiment of the present invention: counterweights 34 are fixedly installed at both ends of the bottom of the delivery station 33; The counterweights 34 help keep the delivery platform 33 stable. The two counterweights 34 are respectively set at the bottom ends of the delivery platform 33, so that the delivery platform 33 will not deviate when it rotates and moves.

[0022] In another embodiment of the present invention: the feeding mechanism includes a slide plate 41 slidably mounted on the base 1, and an abutment plate 45 is fixedly mounted on the top of the slide plate 41; A limiting groove 1.1 and a sliding groove 1.2 are provided on the base 1; A sliding rod 46 is slidably installed on the limiting groove 1.1, a receiving frame 42 is fixedly installed on the sliding rod 46, a telescopic rod 47 is fixedly installed at one end of the sliding rod 46, and a moving block 48 is slidably installed on the sliding groove 1.2, with the telescopic rod 47 sliding through the moving block 48. A circuit board 6 is provided on the receiving frame 42; One end of the receiving frame 42 has a notch; A base plate 44 is fixedly installed at the bottom end of the receiving frame 42. After the abutment plate 45 and the base plate 44 come into contact, the receiving frame 42 can be driven to open to both sides first and then move synchronously in the direction of the abutment plate 45. An electric push rod can be installed on the base 1. The output end of the electric push rod is fixedly connected to the slide plate 41. When the servo motor 31 drives the delivery table 33 to perform a circular motion and approach the receiving frame 42, refer to... Figure 2 When the delivery table 33 rotates clockwise, it approaches the receiving frame 42 from the lower right side. At this time, the electric push rod can push the slide plate 41 to move outward. As the electric push rod pushes the slide plate 41 to move, the abutment plate 45 on it will abut against the bottom plate 44, causing the bottom plate 44 to move the two receiving frames 42 to the sides, thus opening the receiving frames 42. At this time, the circuit board 6 material located on the notch will be put down onto the delivery table 33. As the abutment plate 45 contacts the bottom plate 44, when the receiving frame 42 expands to the maximum distance, the abutment plate 45 will also push the receiving frame 42 to move away from the delivery table 33, so that the receiving frame 42 moves away from the delivery table 33 and does not obstruct the movement of the delivery table 33. When the delivery table 33 rotates to the top, the electric push rod will drive the slide plate 41 to move and reset again. The receiving frame 42 is L-shaped, and the notch is located at the end of the L-shaped receiving frame 42, which is the end closest to the delivery table 33. The other circuit boards 6 are located in the position of the receiving frame 42 without the notch. So when the receiving frame 42 is opened, the circuit at the upper end of the notch will fall down, while the circuit boards 6 in other positions will not fall down.

[0023] In another embodiment of the present invention: the base plate 44 is provided with an inclined groove 44.1 and a flat groove 44.2; When the abutment plate 45 is moved by the sliding plate 41, the abutment plate 45 will first contact the inclined groove 44.1 of the base plate 44. At this time, the pressure on the base plate 44 will drive the two receiving frames 42 to move to the sides. After the abutment plate 45 moves to the position of the flat groove 44.2, the abutment plate 45 will push the base plate 44 to move through the flat groove 44.2, thereby pushing the receiving frames 42 to move away from the delivery table 33 to avoid collision.

[0024] In another embodiment of the present invention: a protrusion 49 is fixedly installed at the bottom end of the slide rod 46, and the protrusion 49 is disposed in the limiting groove 1.1, and the limiting groove 1.1 is L-shaped; The slide bar 46 is set in the limiting groove 1.1 via the protrusion 49. When the abutment plate 45 and the base plate 44 come into contact, the inclined groove 44.1 pushes the receiving frame 42 to move away from each other. At this time, the protrusion 49 will move to both sides in the limiting groove 1.1 until it reaches the end corner position. Then, the abutment plate 45 will also come into contact with the flat groove 44.2. At this time, the abutment plate 45 will push the base plate 44 to move away from the delivery table 33. At this time, the receiving frame 42 will move on the base 1 via the slide bar 46 and the moving block 48. A first spring is provided between the two, and a second spring is provided between the end of the moving block 48 near the delivery table 33 and the base 1. When the electric push rod drives the slide plate 41 to reset, the second spring will pull the moving block 48 to reset, that is, pull the receiving frame 42 to move towards the delivery table 33, so that when the delivery table 33 is close, the receiving frame 42 with the circuit board 6 is located above the delivery table 33 for easy feeding. After the moving block 48 is reset, the first spring will pull the two slide rods 46 to move towards the middle, so that the two receiving frames 42 move towards each other and reset. One of the two receiving frames 42 in the same group is fixedly installed with a baffle 43, and the receiving frame 42 is tilted downward toward the delivery table 33, so that the circuit board 6 on it automatically moves toward the notch.

[0025] In another embodiment of the present invention: an extension plate 51 is fixedly installed on the side wall of the receiving frame 42, a rotating shaft 52 is rotatably installed on the extension plate 51, and a rotating rod 56 is fixedly installed on the rotating shaft 52; A baffle plate 53 and a switching plate 54 are horizontally slidably installed on the receiving frame 42, and a round bar 55 is fixedly installed on both the baffle plate 53 and the switching plate 54. Grooves are provided on both sides of the rotating rod 56, and the dimensions of the round bar 55 and the grooves are matched. A friction plate 57 is fixedly installed on the base 1, and the bottom end of the rotating shaft 52 is in contact with the friction plate 57; When the support frame moves outward through the contact between the abutment plate 45 and the flat groove 44.2, the friction plate 57 will drive the rotating shaft 52 to rotate. As the rotating shaft 52 rotates, it will drive the rotating rod 56 to rotate. The baffle plate 53 and the switching plate 54 also work together to separate several circuit boards 6. (Refer to...) Figure 7When the rotating rod 56 rotates, the rotating rod 56 will drive the circular strip 55 on the baffle plate 53 to move outward through the groove on it. Then the baffle plate 53 will also move outward from the inside of the support frame, thereby opening the internal channel of the receiving frame 42. At this time, due to the tilt setting of the receiving frame 42, the circuit board 6 will move in the direction of the notch inside the receiving frame 42 to facilitate the next feeding. As the rotating rod 56 rotates, the switching plate 54 on the other side will also be inserted into the receiving frame 42. When the switching plate 54 is inserted into the receiving frame 42, it will block the channel of the circuit board 6 inside the receiving frame 42, thereby blocking the second circuit board 6 from moving with the circuit board 6 in front. This allows only one circuit board 6 to move to the position of the notch, avoiding multiple circuit boards 6 from clustering at the notch position.

[0026] In another embodiment of the present invention: the switching plate 54 is provided with a chamfer; When the rotating rod 56 rotates and engages with the round bar 55 through its groove, it causes the baffle plate 53 to move outward, while the switching plate 54 moves inward. Since the switching plate 54 has a chamfer, when the switching plate 54 enters the support frame, although the circuit boards 6 are close to each other due to the tilt of the support frame, the chamfer on the switching plate 54 allows it to be inserted between the two circuit boards 6. This separates the circuit board 6 between the switching plate 54 and the baffle plate 53 from the next circuit board 6. Then, as the baffle plate 53 is completely removed from the receiving frame 42, the circuit board 6 between the switching plate 54 and the baffle plate 53 will slide to the notch on the receiving frame 42, making it easier to load onto the delivery table 33 next time.

[0027] In another embodiment of the present invention: a connecting rod 37 is fixedly installed on the base 1, and an abutment strip 38 is fixedly installed on the connecting rod 37; A protruding plate 36 is fixedly installed on the connecting shaft 35; As the servo motor 31 drives the connecting plate 32 and the delivery table 33 to rotate and reflow solder, the circuit board 6 on the delivery table 33 rises and heats up after the reflow soldering is completed. Then it will descend from the other side. When it descends from the other side, the protruding plate 36 on the connecting shaft 35 will contact the abutment strip 38. At this time, the abutment strip 38 will push the connecting shaft 35 to rotate. Then the delivery table 33 will tilt and rotate without the control of the two counterweights 34, so that the soldered circuit board 6 on the delivery table 33 will slide down to the other end of the base 1 for unloading and collection. The other end of the base 1 is tilted so that the falling circuit board 6 can slide down directly.

[0028] A high-efficiency reflow oven welding process, comprising the reflow oven described above, includes the following steps: S1. Place several circuit boards 6 on the support frame and load them onto the delivery table 33 through the support frame; S2. After the circuit board 6 is loaded onto the delivery table 33, it will rise in the top seat 2 as the delivery table 33 rotates, thereby preheating and soldering, and then cooling and conveying away. S3. After welding is completed, as the delivery table 33 descends, the abutment bar 38 will cooperate with the protruding plate 36 to make the delivery table 33 rotate for tilted feeding. S4, the delivery table 33 continues to rotate for the next round of loading and rises for reflow soldering.

Claims

1. A high-efficiency reflow oven, comprising a base (1) and a top seat (2) fixedly mounted on the base (1), wherein a hot air mechanism is provided inside the top seat (2), characterized in that, Also includes: A heating mechanism is provided on a base (1), which includes a delivery table (33) that is rotatably disposed within the base (1); The feeding mechanism is located on one side of the base (1), and when the delivery table (33) is close to the feeding mechanism, the feeding mechanism can passively feed the material on it onto the delivery table (33) and automatically avoid it.

2. A high efficiency reflow soldering oven as claimed in claim 1, characterized in that The heating mechanism includes a servo motor (31) fixedly installed on one side of the base (1). A connecting plate (32) is fixedly installed at the output end of the servo motor (31). A connecting shaft (35) is rotatably installed at the other end of the connecting plate (32). The connecting shaft (35) is fixedly connected to the delivery table (33).

3. The high efficiency reflow soldering oven of claim 1, wherein, The bottom ends of the delivery station (33) are fixedly equipped with counterweights (34).

4. The high-efficiency reflow oven as described in claim 1, characterized in that, The feeding mechanism includes a slide plate (41) that is slidably mounted on a base (1), and an abutment plate (45) is fixedly mounted on the top of the slide plate (41). The base (1) has a limiting groove (1.1) and a sliding groove (1.2). A sliding rod (46) is slidably installed on the limiting groove (1.1), a receiving frame (42) is fixedly installed on the sliding rod (46), a telescopic rod (47) is fixedly installed at one end of the sliding rod (46), a moving block (48) is slidably installed on the sliding groove (1.2), and the telescopic rod (47) slides through the moving block (48). A circuit board (6) is provided on the receiving frame (42); One end of the receiving frame (42) is provided with a notch; The bottom end of the receiving frame (42) is fixedly installed with a base plate (44). After the abutment plate (45) and the base plate (44) come into contact, the receiving frame (42) can be driven to open to both sides and then move synchronously in the direction of the abutment plate (45).

5. The high-efficiency reflow oven as described in claim 4, characterized in that, The base plate (44) is provided with a sloping groove (44.1) and a flat groove (44.2).

6. A high efficiency reflow soldering oven as claimed in claim 5, characterized in that The bottom end of the slide bar (46) is fixedly installed with a protrusion (49), and the protrusion (49) is set in the limiting groove (1.1), and the limiting groove (1.1) is L-shaped.

7. A high efficiency reflow soldering oven as claimed in claim 6, characterized in that An extension plate (51) is fixedly installed on the side wall of the receiving frame (42), a rotating shaft (52) is rotatably installed on the extension plate (51), and a rotating rod (56) is fixedly installed on the rotating shaft (52). A baffle plate (53) and a switching plate (54) are horizontally slidably installed on the receiving frame (42), and a round strip (55) is fixedly installed on both the baffle plate (53) and the switching plate (54). Grooves are provided on both sides of the rotating rod (56), and the dimensions of the round strip (55) and the grooves are matched. A friction plate (57) is fixedly installed on the base (1), and the bottom end of the rotating shaft (52) is in contact with the friction plate (57).

8. The high-efficiency reflow oven as described in claim 7, characterized in that, The switching plate (54) is provided with a chamfer.

9. The high-efficiency reflow oven as described in claim 1, characterized in that, A connecting rod (37) is fixedly installed on the base (1), and an abutment strip (38) is fixedly installed on the connecting rod (37). A protruding plate (36) is fixedly installed on the connecting shaft (35).

10. A welding process for a high-efficiency reflow oven, comprising the reflow oven of any one of claims 1-9, characterized in that, Includes the following steps: S1. Place several circuit boards (6) on the carrier frame and load them onto the delivery table (33) through the carrier frame; S2. When the circuit board (6) is loaded onto the delivery table (33), it will rise in the top seat (2) as the delivery table (33) rotates, thereby preheating and soldering, and then cooling and conveying away. S3. After welding is completed, as the delivery table (33) descends, the abutment bar (38) will cooperate with the convex plate (36) to make the delivery table (33) rotate for tilting feeding. S4. The delivery station (33) continues to rotate for the next round of loading and rises for reflow soldering.

Images