Air outlet structure and reflow soldering equipment with same

Abstract

The utility model relates to the technical field of reflow soldering, and provides an air outlet structure and reflow soldering equipment with the same. The air outlet structure comprises an air outlet plate body and a plurality of equal-height hollow pipes which are fixed on the air outlet plate body, are uniformly distributed on the air outlet plate body and have a certain height, and further comprises a slag removal plate capable of penetrating through the hollow pipes and an air blocking frame arranged on the periphery of the air outlet plate body. The air outlet structure and the reflow soldering equipment can effectively solve the problems that in an existing reflow soldering technology, tin slag falls off, so that air outlet plate holes are blocked, and hot air flow transmission is not smooth, the tin slag is convenient to clean, meanwhile, the distance between the hot air outlet holes and the soldering face can be shortened, hot air dissipation is reduced, and the purposes of concentrating heat and reducing energy consumption are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of reflow soldering, in particular to an air outlet structure for through-hole reflow soldering and a reflow soldering device having the same. Background Art

[0002] Through-hole reflow oven is a device that melts solder paste by providing a lower heating and upper cooling environment, so that the pins of plug-in components and PCB pads can be reliably combined together through solder paste. It is a gradually emerging welding process with the characteristics of high efficiency, high yield rate and low cost. It can replace traditional wave soldering in some welding fields and has been gradually widely used in the field of electronic circuit board production. Its operation method is to put the product to be soldered into the furnace from the feeding end of the reflow oven. With the operation of the conveyor chain, the product to be soldered will pass through the preheating zone, insulation zone, welding zone and cooling zone in the furnace in turn, and then flow out from the other end of the reflow oven to complete the welding process. In this process, due to the upper cooling and lower heating of the through-hole reflow oven, the product will be affected by the hot and cold shocks from the upper and lower sides when passing through the preheating zone, insulation zone and welding zone. A small part of the tin slag on the bottom of the PCB that exists at the end of the component pins or does not completely wrap the pad will melt and drip on the air outlet plate of the heating chamber. After long-term accumulation, the dripping tin slag will block the holes of the air outlet plate of the lower heating chamber, resulting in poor transmission of hot air flow and affecting the uniformity of the hot air flow and temperature in the heating chamber. In view of this situation, users need to regularly maintain the air outlet plate to clean the tin slag and use various tools to open the air outlet holes to allow the hot air flow to flow smoothly. The maintenance cycle is short, the cleaning is frequent and difficult, and it is time-consuming and labor-intensive. At the same time, because the product is a plug-in component with a certain height and a large internal space in the furnace, when the product is welded in the furnace, the welding surface of the product is a certain distance away from the air outlet plate. Affected by the cold air from the upper layer, the heat of the lower layer is easily dissipated and lost. In order for the lower welding surface to reach the temperature required for welding, the heating chamber must be set to a higher temperature, which will also increase the energy consumption of the equipment.

[0003] In view of this, the utility model provides an air outlet structure and a reflow soldering device having the same, which can solve the problems existing in the above-mentioned technology. Utility Model Content

[0004] The utility model provides an air outlet structure and a reflow soldering device having the same, which aims to solve the problems that tin slag falls and blocks the holes of the air outlet plate during the use of the existing through-hole reflow soldering, resulting in poor hot air flow, frequent and difficult cleaning of the tin slag, and serious heat dissipation loss and high equipment energy consumption.

[0005] In order to solve these problems existing in the prior art, the utility model provides the following technical solutions:

[0006] The utility model provides an air outlet structure, which comprises an air outlet plate body, a slag cleaning plate and a plurality of hollow tubes fixed on the air outlet plate body and having a set height. The slag cleaning plate is arranged below the air outlet of the hollow tube, and the slag cleaning plate is provided with a plurality of through holes for the hollow tubes to pass through.

[0007] Furthermore, the hollow tubes are evenly distributed on the air outlet plate body, and the air outlet plate body is provided with a plurality of air outlet holes corresponding to the hollow tubes and of equal size, and the diameter of the air outlet holes is 3mm-7mm.

[0008] Furthermore, the hollow tubes have the same structure and the same height, the inner diameter of the central hole of the hollow tube is the same as the diameter of the air outlet hole of the air outlet plate body, and the central hole of the hollow tube is concentric with the air outlet hole of the air outlet plate body.

[0009] Furthermore, the through holes on the slag cleaning plate correspond to the positions of the air outlet holes on the air outlet plate body, and the diameter of the through holes on the slag cleaning plate is 1-2 mm larger than the outer diameter of the hollow tube.

[0010] Furthermore, two threaded holes are provided on two symmetrical sides of the slag cleaning plate to facilitate taking and placing the slag cleaning plate.

[0011] Furthermore, the air outlet structure is also provided with a wind shield frame, and the slag cleaning plate passes through the hollow tube through the through hole and is placed on the wind shield frame.

[0012] Furthermore, the wind shield frame is installed around the air outlet plate body, and the wind shield frame has two opposite long ribs and two short ribs, the long ribs are higher than the air outlet of the hollow tube, and the short ribs are lower than the air outlet of the hollow tube.

[0013] Furthermore, the hollow tube is perpendicular to the air outlet plate body, and the hollow tube and the air outlet plate body are fixedly connected by one of welding, riveting and threaded connection.

[0014] Furthermore, the air outlet plate body, the hollow tube, the slag cleaning plate, and the wind shield frame are all made of high temperature resistant materials, including but not limited to stainless steel.

[0015] The utility model also provides a reflow soldering device with the air outlet structure, comprising an upper furnace, a lower furnace, a heating chamber, an air outlet structure, a transmission guide rail and an air outlet structure; an inner cavity is formed between the upper furnace and the lower furnace, the transmission guide rail passes through the inner cavity, the heating chamber is arranged in the inner cavity, the heating chamber is provided with an air outlet structure, the air outlet structure comprises an air outlet plate body, a plurality of hollow tubes fixed on the air outlet plate body and having a set height, and a slag cleaning plate, the slag cleaning plate is arranged below the air outlet of the hollow tube, and the slag cleaning plate is provided with a plurality of through holes for each hollow tube to pass through.

[0016] Compared with the prior art, the air outlet structure of the utility model and the reflow soldering equipment having the same have the following advantages:

[0017] 1. In the air outlet structure of the technical solution of the utility model, the hollow tube has a set height and has a drainage function. The hot air flow is ejected from the air outlet of the hollow tube. When the product passes through the furnace, the molten tin slag dripping will directly drip onto the slag cleaning plate and accumulate. The slag cleaning plate is lower than the air outlet of the hollow tube, so there is no risk that the tin slag will block the air outlet and cause the hot air flow to flow unsmoothly. At the same time, because the slag cleaning plate is lower than the air outlet of the hollow tube, more tin slag can be accumulated on the slag cleaning plate before cleaning, which can extend the tin slag cleaning time and reduce the cleaning frequency.

[0018] 2. When cleaning the tin slag, you only need to install long screws on the two threaded holes on both sides of the slag cleaning plate to easily remove the slag cleaning plate to deal with the tin slag on it. There is no need to use other tools to open the air outlet holes for the second time. It is convenient and quick. After dealing with the tin slag, the slag cleaning plate can be directly placed back to its original position by aligning it with the hollow tube. It is easy to take, clean and install.

[0019] 3. In the air outlet structure of the technical solution of the utility model, the hollow tube has a set height, and the hot air flow is ejected from the hollow tube mouth. Under the same internal space conditions of the furnace, when the product is passed through the furnace for welding, the distance between the welding surface of the product and the hollow tube mouth from which the hot air is ejected can be greatly shortened, which can effectively reduce the influence of the lower layer of heat on the upper layer of cold air. When using the through-hole reflow soldering equipment with this air outlet structure, compared with the original air outlet structure, the setting temperature of the heating chamber can be appropriately lowered to meet the welding requirements and reduce the energy consumption of the equipment. At the same time, due to the existence of the wind shield frame, the two long side guards of the wind shield frame are higher than the hollow tube mouth, which can effectively reduce the heat from both sides. Evaporation, so as to achieve the purpose of concentrating heat and reducing heat loss.

[0020] To sum up, the utility model provides an air outlet structure and a reflow soldering device having the same, which can effectively prevent tin slag from falling and clogging the air outlet holes and facilitate the removal and cleaning of the slag cleaning plate, thereby solving the problem that tin slag falls and clogs the air outlet holes during the use of the existing through-hole reflow soldering, resulting in poor flow of hot air flow and frequent and difficult cleaning of the tin slag. At the same time, it can also reduce the dissipation of hot air, concentrate heat, reduce losses, and reduce equipment energy consumption. It has great advantages in reducing the use cost of through-hole reflow soldering and can better meet the use requirements of the through-hole reflow soldering process.

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the reflow soldering equipment of the utility model;

[0023] Figure 2 This is a schematic diagram of the air outlet structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the decomposition of the air outlet structure of the utility model;

[0025] Figure 4 This is a schematic diagram of the air outlet plate and hollow tube structure of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the slag cleaning plate of the utility model.

[0027] Explanation of the numbers: 1-air outlet plate, 2-hollow tube, 3-slag cleaning plate, 4-wind shield frame, 11-air outlet hole, 21-air outlet, 31-threaded hole, 32-through hole, 41-long rib, 42-short rib. 5-upper furnace, 6-lower furnace, 7-heating chamber, 8-transmission guide rail, 9-product DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the examples of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. It is obvious that the specific embodiments described here are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the utility model. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] refer to Figures 1 to 5 The present embodiment provides a reflow soldering device, which includes an upper furnace 5, a lower furnace 6, a heating chamber 7 and a transmission guide 8. An inner cavity is formed between the upper furnace 5 and the lower furnace 6, the transmission guide 8 passes through the inner cavity, the heating chamber 7 is arranged in the inner cavity, and the heating chamber 7 is provided with an air outlet structure.

[0030] The air outlet structure includes an air outlet plate body 1, a plurality of hollow tubes 2 of equal height fixed on the air outlet plate body 1 and evenly distributed with a set height, a slag cleaning plate 3 and a wind shield frame 4. The wind shield frame 4 is placed around the air outlet plate body 1 and the slag cleaning plate 3, and the slag cleaning plate 3 passes through the hollow tube 2 and is placed on two opposite short retaining edges 42 of the wind shield frame 4.

[0031] Specifically, a plurality of evenly distributed air outlet holes 11 of equal size are provided on the air outlet plate body 1, each air outlet hole 11 corresponds to each hollow tube 2 one by one, and the diameter of the air outlet hole 11 is 3mm-7mm. Of course, in actual use, the same air outlet structure used on the same equipment has the same diameter of the air outlet holes 11, so as to facilitate the processing of the parts structure.

[0032] Each hollow tube 2 is vertically fixed on the air outlet plate body 1, and each hollow tube 2 has the same structure and the same height. The inner diameter of the center hole of the hollow tube 2 is the same as the diameter of the air outlet hole 11 of the air outlet plate body, and the center hole of the hollow tube 2 is concentric with the air outlet hole 11 of the air outlet plate body. The fixed connection between the hollow tube 2 and the air outlet plate body 1 includes, but is not limited to, welding, riveting, threaded connection and other methods. In this embodiment, the hollow tube 2 is fixed to the air outlet plate body 1 by welding.

[0033] The slag cleaning plate 3 is arranged below the air outlet 21 of the hollow tube 2, that is, the slag cleaning plate is lower than the air outlet 21 of the hollow tube 2. The slag cleaning plate 3 is provided with a plurality of through holes 32 for each hollow tube 2 to pass through. The through holes 32 on the slag cleaning plate 3 correspond to the positions of the air outlet holes 11 on the air outlet plate body 1. The diameter of the through holes 32 is 1-2 mm larger than the outer diameter of the hollow tube 2, so that the slag cleaning plate 3 can easily pass through the hollow tube 2. The slag cleaning plate 3 also has two threaded holes 31 on both sides of symmetry for convenient placement of the slag cleaning plate 3. When the slag cleaning plate 3 needs to be taken out, two screws can be used to pass through the threaded holes 31 on both sides to lift up or put down the slag cleaning plate 3. The slag cleaning plate 3 is placed on the two short retaining edges 42 of the wind shield frame 4 through the hollow tube 2 in the internal area of ​​the wind shield frame 4.

[0034] The wind shield frame 4 is installed around the air outlet plate body 1, and has two opposite long ribs 41 and two short ribs 42, wherein the long rib 41 is higher than the air outlet 21 of the hollow tube 2, and the short rib 42 is lower than the air outlet 21 of the hollow tube 2. When the hot air flow is ejected from the air outlet 21 of the hollow tube 2, the two long ribs 41 can block part of the hot air flow from escaping, concentrate heat and reduce loss.

[0035] In this embodiment, the air outlet plate body 1, the hollow tube 2, the slag cleaning plate 3, and the wind shield frame 4 are all made of high temperature resistant materials, including but not limited to stainless steel materials, which can effectively extend the service life of the structure.

[0036] The air outlet structure provided in this embodiment is fixed to the heating chamber 7 of the reflow soldering equipment by bolt connection. However, during actual use, the air outlet structure can be made into a movable component, that is, a sliding groove is formed between the air outlet structure and the heating chamber 7, so that the air outlet structure can be easily taken out for maintenance.

[0037] When the product 9 is passed through the furnace for welding along the conveying guide rail 8, the bottom welding surface of the product 9 is at a short distance from the pipe opening of the hollow tube 2. When the hot air is ejected from the pipe opening of the hollow tube 2 of the air outlet plate, it can effectively act on the welding surface. The hot air escaping to the surroundings will be blocked by the long rib 41 and concentrated in this welding area, so that the heat is more concentrated, the dissipation loss is reduced, and the energy consumption is reduced.

[0038] In the actual use of this embodiment, the hollow tube 2 of the air outlet structure becomes a channel for the hot air flow to flow out, and the hot air flow is ejected from the hollow tube 2. When the product 9 passes through the furnace, the molten tin slag dripping will directly drip onto the slag cleaning plate 3 and accumulate. The slag cleaning plate 3 is lower than the air outlet 21 of the hollow tube 2, so there is no problem of dripping tin slag blocking the air outlet 21 and causing the hot air flow to flow unsmoothly. At the same time, because the slag cleaning plate 3 is lower than the air outlet 21 of the hollow tube 2, more tin slag can be accumulated on the slag cleaning plate 3 before cleaning, which can extend the tin slag cleaning time and reduce the cleaning frequency.

[0039] In this embodiment, when it is necessary to clean the tin slag, it is only necessary to install long screws on the two threaded holes 31 symmetrically opened on both sides of the slag cleaning plate 3, so that the slag cleaning plate 3 can be easily taken out to deal with the tin slag thereon, and no other tools are needed to open the air outlet hole 11 for a second time. It is convenient and quick. After dealing with the tin slag, the slag cleaning plate 3 can be directly placed back to its original position by aligning it with the hollow tube 2, which is convenient to take, place, clean and install.

[0040] At the same time, the hollow tube 2 of the air outlet structure in this embodiment has a certain height, and the hot air flow is ejected from the mouth of the hollow tube 2. Under the same internal space conditions of the furnace, when the product 9 is passed through the furnace for welding, the distance between the welding surface of the product 9 and the mouth of the hollow tube 2 from which the hot air is ejected can be greatly shortened, which can effectively reduce the influence of the lower layer heat on the upper layer cold air. When using the through-hole reflow soldering equipment with this air outlet structure, compared with the original air outlet structure, the setting temperature of the heating chamber 7 can be appropriately lowered to meet the welding requirements and reduce the energy consumption of the equipment. At the same time, due to the existence of the wind shield frame 4, the two long ribs 41 of the wind shield frame 4 are higher than the mouth of the hollow tube 2, which can effectively reduce the heat from both sides. Evaporation, to achieve the purpose of concentrating heat and reducing heat loss.

[0041] To sum up, the utility model provides an air outlet structure and a reflow soldering device having the same, which can effectively prevent tin slag from falling and clogging the air outlet holes 11 of the air outlet plate body and facilitate the removal and cleaning of the slag cleaning plate 3, thereby solving the problem that tin slag falls and blocks the air outlet holes 11 of the air outlet plate body 1 during the use of the existing through-hole reflow soldering, resulting in poor hot air flow and frequent and difficult cleaning of the tin slag. At the same time, it can also concentrate heat to reduce loss and reduce equipment energy consumption, which has great advantages in reducing the use cost of through-hole reflow soldering and can better meet the use requirements of the through-hole reflow soldering process.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In the description of the present invention, “several” means at least two or more, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air outlet structure, characterized in that: include: An air outlet plate body, a slag cleaning plate and a plurality of hollow tubes fixed on the air outlet plate body and having a set height, wherein the slag cleaning plate is arranged below the air outlet of the hollow tube, and the slag cleaning plate is provided with a plurality of through holes for each of the hollow tubes to pass through.

2. The air outlet structure according to claim 1, characterized in that: The hollow tubes are evenly distributed on the air outlet plate body, and the air outlet plate body is provided with a plurality of air outlet holes corresponding to the hollow tubes and of equal size, and the diameter of the air outlet holes is 3mm-7mm.

3. The air outlet structure according to claim 2, characterized in that: The hollow tubes have the same structure and the same height, the inner diameter of the central hole of the hollow tube is the same as the diameter of the air outlet hole of the air outlet plate body, and the central hole of the hollow tube is concentric with the air outlet hole of the air outlet plate body.

4. The air outlet structure according to claim 1, characterized in that: The through holes on the slag cleaning plate correspond to the positions of the air outlet holes on the air outlet plate body, and the diameter of the through holes on the slag cleaning plate is 1-2 mm larger than the outer diameter of the hollow tube.

5. The air outlet structure according to claim 1, characterized in that: The slag cleaning plate is provided with two threaded holes on two symmetrical sides to facilitate taking and placing the slag cleaning plate.

6. The air outlet structure according to claim 1, characterized in that: The air outlet structure is also provided with a wind shield frame, and the slag cleaning plate passes through the hollow tube through the through hole and is placed on the wind shield frame.

7. The air outlet structure according to claim 6, characterized in that: The wind shield frame is installed around the air outlet plate body, and has two opposite long ribs and two short ribs. The long ribs are higher than the air outlet of the hollow tube, and the short ribs are lower than the air outlet of the hollow tube.

8. The air outlet structure according to claim 1, characterized in that: The hollow tube is perpendicular to the air outlet plate body, and the hollow tube and the air outlet plate body are fixedly connected by one of welding, riveting and threaded connection.

9. A reflow soldering device, comprising an upper furnace, a lower furnace, a heating chamber, an air outlet structure and a transmission rail; an inner cavity is formed between the upper furnace and the lower furnace, and the transmission rail passes through the inner cavity; the heating chamber is arranged in the inner cavity, characterized in that: The heating chamber is provided with an air outlet structure, which includes an air outlet plate body, a plurality of hollow tubes fixed on the air outlet plate body and having a set height, and a slag cleaning plate. The slag cleaning plate is arranged below the air outlet of the hollow tube, and the slag cleaning plate is provided with a plurality of through holes for each of the hollow tubes to pass through.

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