Reflow soldering furnace with high operation safety for SMT (Surface Mount Technology) processing

Abstract

The utility model relates to the technical field of reflow soldering, in particular to a reflow soldering furnace for SMT (Surface Mount Technology) processing, which is high in operation safety and comprises a welding workbench, a mesh belt conveyor, an air heater and an air cooler, the welding workbench comprises a plurality of lower furnace bottoms and a plurality of upper furnace covers, a conveying cavity is formed in each lower furnace bottom, and the mesh belt conveyor is arranged in the conveying cavity. A mesh belt conveyor is installed in each conveying cavity, the upper furnace covers can cover the lower furnace bottom, a connecting protrusion is fixedly arranged on one side of the lower furnace bottom, a connecting groove matched with the connecting protrusion is formed in the other side of the lower furnace bottom, ventilation openings are formed in the upper furnace covers, air heaters are installed on the upper furnace covers, an air cooler is installed on one of the upper furnace covers, and an air outlet is formed in the other side of the lower furnace bottom. And the upper furnace cover provided with the air cooler is in the discharging direction. When a fire disaster occurs, the lower furnace bottom on fire can be separated, so that the problem that greater economic loss is caused after the fire disaster spreads when the fire disaster occurs is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of reflow soldering, in particular to a reflow soldering furnace for SMT processing with high operating safety. Background Art

[0002] The reflow soldering furnace is used to solder surface mount (SMT) components onto a printed circuit board (PCB). To ensure production safety, emergency stop switches are installed at appropriate positions. However, if emergency stop switches are installed at each position, it will greatly increase the economic investment of the production line, resulting in low practicability.

[0003] Based on the above problems, the Chinese patent with the publication number CN213560413U discloses a reflow soldering furnace for SMT processing with high operating safety. By setting a pressing airbag, a cylinder body, a connecting pipe, a piston, a sliding rod, a touch plate and an emergency stop switch, the device can trigger the emergency stop switch in multiple positions in time, without the need to set emergency stop switches in multiple positions, which not only facilitates the work of the staff, but also reduces the economic investment, thereby improving the practicability of the device.

[0004] However, when implementing the above-mentioned reflow soldering furnace for SMT processing with high operating safety, it is found that it at least has the following problems: the circuit board needs to be preheated, soldered (heat melted) and cooled in the reflow soldering furnace. When soldering, hot air needs to be blown onto the circuit board to melt the solder paste on the circuit board. However, the reflow soldering furnace is an integrated type. When the reflow soldering furnace is not properly maintained, the welding area is easily affected by high temperature and fires are likely to occur. Moreover, due to the continuous blowing of hot air, the fire spreads quickly, causing the fire to spread rapidly towards the preheating area, resulting in great economic losses. Summary of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a reflow soldering furnace for SMT processing with high operating safety, which can separate the reflow soldering furnace to prevent the spread of fire, so as to solve the problem that the integrated reflow soldering furnace in the prior art is prone to fire spread and is likely to cause great economic losses.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the utility model provides a reflow soldering furnace for SMT processing with relatively high operation safety, including: a soldering workbench, a mesh belt conveyor, a hot air blower, and a cold air blower. The soldering workbench includes a plurality of lower furnace bottoms and a plurality of upper furnace covers. A conveying cavity is opened in each lower furnace bottom, and a mesh belt conveyor is installed in each conveying cavity. The upper furnace covers can all be covered on the lower furnace bottoms. A connecting protrusion is fixedly provided on one side of the lower furnace bottom, and a connecting groove adapted to the connecting protrusion is provided on the other side. Ventilation openings are opened on the upper furnace covers, and a hot air blower is installed on each of the plurality of upper furnace covers. A cold air blower is installed on one of the upper furnace covers, and the upper furnace cover with the cold air blower is in the discharging direction.

[0009] Optionally, the conveyor belt of the mesh belt conveyor is a Z-shaped metal mesh belt.

[0010] Optionally, universal wheels with limit functions are installed at the bottom of each lower furnace bottom.

[0011] Optionally, the connecting protrusion is rectangular, its free end is narrower, and the fixed part of the connecting protrusion with the lower furnace bottom is wider. A sealing layer is provided on the connecting protrusion, and the sealing layer is bonded to the connecting protrusion.

[0012] Optionally, retaining bars are fixedly provided on both sides inside the conveying cavity of each lower furnace bottom.

[0013] Optionally, a sliding groove is provided at the closing part of the lower furnace bottom and the upper furnace cover, and a sliding block that slides in the sliding groove is provided on the upper furnace cover.

[0014] Optionally, a pulley is installed at the place where the sliding block abuts against the sliding groove, and the pulley can support the upper furnace cover.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a reflow soldering furnace for SMT processing with relatively high operation safety, and has the following beneficial effects:

[0017] 1. By providing a connecting protrusion and a connecting groove on the lower furnace bottom and enabling the plurality of lower furnace bottoms to be inserted into each other, in case of a fire, the burning lower furnace bottom can be separated, thus preventing the problem of greater economic losses caused by the spread of the fire when the fire occurs, and solving the problem in the traditional technology that the reflow soldering furnace is integrated and the fire spreads relatively fast, resulting in relatively large economic losses.

[0018] 2. By setting the mesh belt of the mesh belt conveyor as a Z-shaped metal mesh belt, the gap can facilitate the circulation of hot air.

[0019] 3. The utility model is provided with a sliding groove at the joint of the lower furnace bottom and the upper furnace cover, and a slider sliding in the sliding groove is provided on the upper furnace cover, thereby ensuring that the lower furnace bottom will not fall during the sliding process of the upper furnace cover, and maintaining the stability of the upper furnace cover during sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 Shows Figure 1 Schematic diagram of the internal structure;

[0022] Figure 3 A schematic diagram of a part of the structure is shown;

[0023] Figure 4 Shows Figure 3 A schematic diagram of the structure from a side view;

[0024] Figure 5 Shows the structural diagram of the upper furnace cover

[0025] Figure 6 A schematic cross-sectional structure diagram of a connecting protrusion is shown.

[0026] In the figure: 1. welding workbench; 101. upper furnace cover; 102. lower furnace bottom; 103. conveying chamber; 2. mesh belt conveyor; 3. hot air blower; 4. cold air blower; 5. connecting protrusion; 6. connecting groove; 7. vent; 8. universal wheel; 9. sealing layer; 10. baffle; 11. sliding groove; 12. slider; 13. pulley. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example: See Figures 1 to 6, according to an embodiment of the present utility model, a technical solution is provided: a reflow soldering furnace for SMT processing with high operating safety, including: a soldering workbench 1, a mesh belt conveyor 2, a hot air blower 3, and a cold air blower 4. The soldering workbench 1 includes a plurality of lower furnace bottoms 102 and a plurality of upper furnace covers 101. Each lower furnace bottom 102 is provided with a conveying cavity 103 inside. A mesh belt conveyor 2 is installed in each conveying cavity 103. The mesh belt conveyor 2 in the conveying cavity 103 can transfer the circuit board to the mesh belt conveyor 2 in another conveying cavity 103. The upper furnace covers 101 can all be covered on the lower furnace bottoms 102. A connecting protrusion 5 is fixedly provided on one side of the lower furnace bottom 102, and a connecting groove 6 adapted to the connecting protrusion 5 is provided on the other side. Ventilation openings 7 are provided on the upper furnace covers 101. A hot air blower 3 is installed on each of the plurality of upper furnace covers 101, and a cold air blower 4 is installed on one of the upper furnace covers 101. The upper furnace cover 101 on which the cold air blower 4 is installed is the discharging direction. It should be noted that both the hot air blower 3 and the cold air blower 4 are prior arts, so no detailed description is made. The soldering workbench 1 is most preferably six lower furnace bottoms 102 and five upper furnace covers 101. The upper furnace cover 101 is covered between two lower furnace bottoms 102. The hot air blown by the hot air blowers 3 on the first three upper furnace covers 101 has a lower temperature for the preheating section. The temperature of the hot air blower 3 on the subsequent upper furnace cover 101 can melt the solder paste for the soldering section. The cold air blower 4 on the upper furnace cover 101 at the discharging port can cool the circuit board for the cooling section.

[0029] For the reflow soldering furnace for SMT processing with high operating safety adopting the above structure, by setting the soldering workbench 1 into a plurality of lower furnace bottoms 102 and a plurality of upper furnace covers 101, and providing a connecting protrusion 5 and a connecting groove 6 on the lower furnace bottom 102, by inserting the plurality of lower furnace bottoms 102 into each other and covering the upper furnace covers 101 on the lower furnace bottoms 102, and transferring the circuit board through the mesh belt conveyor 2 to complete preheating, soldering, and cooling. In case of a fire, the burning lower furnace bottom 102 can be separated, thus preventing the problem of greater economic losses caused by the spread of the fire when the fire occurs, and the upper furnace cover 101 can be taken out to facilitate quick extinguishing of the fire, thereby increasing the safety of the reflow soldering furnace, and solving the problem in the traditional technology that the reflow soldering furnace is integrated. When the reflow soldering furnace is not properly maintained, the soldering area is prone to fire under the influence of high temperature, and the fire spreads quickly, causing greater economic losses.

[0030] In this embodiment, the mesh belt conveyor 2 includes many types of mesh belts such as herringbone mesh belts, overlapping mesh belts, and double spiral mesh belts, etc. However, the Z-shaped metal mesh belt has the advantages of flexible rotation, good stability, and air permeability. Its gaps can facilitate the circulation of hot air. Therefore, the mesh belt of the mesh belt conveyor 2 is set as a Z-shaped metal mesh belt.

[0031] In this embodiment, to facilitate the movement of the lower furnace body, universal wheels 8 with limit functions are installed at the bottom of each lower furnace bottom 102. By setting the universal wheels 8, it is convenient to move the lower furnace body during assembly and disassembly. It should be noted that the existing universal wheels 8 generally have limit structures to prevent the displacement of the universal wheels 8.

[0032] In this embodiment, to facilitate the docking between the lower furnace bottoms 102, the connecting protrusion 5 is set as a rectangle with a narrower free end and a wider fixed part with the lower furnace bottom 102, so as to facilitate the docking between the two lower furnace bodies. At the same time, a sealing layer 9 is adhered to the connecting protrusion 5 to increase the sealing performance between the two lower furnace bottoms 102.

[0033] In this embodiment, to prevent the circuit board from being transmitted to the edge of the lower furnace bottom 102 by the mesh belt conveyor 2 during the transmission process, retaining bars 10 are fixedly installed on both sides of the transmission cavity 103 of each lower furnace bottom 102. Through the retaining bars 10, the circuit board can be preheated or welded by the hot air blower 3 during the transmission of the mesh belt conveyor 2.

[0034] In this embodiment, during the use process, sometimes it is necessary to slide the upper furnace cover 101 to observe the circuit board. A sliding groove 11 is provided at the joint between the lower furnace bottom 102 and the upper furnace cover 101, and a slider 12 that slides in the sliding groove 11 is provided on the upper furnace cover 101, so as to ensure that the upper furnace cover 101 will not fall off the lower furnace bottom 102 during the sliding process and maintain the stability during the sliding of the upper furnace cover 101.

[0035] In this embodiment, to further increase the stability of the upper furnace cover 101 during the sliding process in the sliding groove 11, a pulley 13 is installed at the contact between the slider 12 and the sliding groove 11, and the upper furnace cover 101 can be supported by the pulley 13.

[0036] Working principle: During the assembly process of the soldering workbench 1, by pushing between two adjacent lower furnace bottoms 102 through the connecting protrusion 5 and the connecting groove 6, the two lower furnace bottoms 102 are closed. Then, the universal wheels 8 are restricted to make it difficult for the lower furnace bottom 102 to move. After the assembly of the lower furnace bottom 102 is completed, the upper furnace cover 101 is covered on the lower furnace bottom 102 to complete the assembly;

[0037] During the soldering process, the circuit board is placed on the mesh belt conveyor 2 in the feeding direction and transmitted to the subsequent mesh belt conveyor 2. During the transmission of the mesh belt conveyor 2, the hot air blower 3 preheats the circuit board. When the preheating is completed, the circuit board is soldered, and then cooled by the cold air blower 4.

[0038] In case of a fire, generally open flames appear in the preheating zone and the welding zone. The causes of the fire are diverse. When open flames appear in the preheating zone and / or the welding zone, the upper furnace cover 101 can be slid open to avoid the open flames burning the hot air blower 3, and the hot air blower 3 is turned off to prevent the hot air from fueling the spread of the fire. Then, the lower furnace bottom 102 is separated to prevent the fire from causing greater losses during its spread. After that, the burning lower furnace bottom 102 that has separated is extinguished.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reflow oven for SMT processing with high operating safety, characterized in that: include: A welding workbench (1), a mesh belt conveyor (2), a hot air blower (3) and a cold air blower (4), wherein the welding workbench (1) comprises a plurality of lower furnace bottoms (102) and a plurality of upper furnace covers (101), each of the lower furnace bottoms (102) is provided with a conveying cavity (103), each of the conveying cavity (103) is provided with the mesh belt conveyor (2), and the upper furnace covers (101) can be covered on the lower furnace bottoms (102). A connecting protrusion (5) is fixedly provided on one side of the lower furnace bottom (102), and a connecting groove (6) matched with the connecting protrusion (5) is provided on the other side thereof; ventilation holes (7) are provided on the upper furnace cover (101); a plurality of the upper furnace covers (101) are installed with a hot air blower (3); one of the upper furnace covers (101) is installed with the cold air blower (4); and the upper furnace cover (101) installed with the cold air blower (4) is in the discharge direction.

2. A reflow oven for SMT processing with high operational safety according to claim 1, characterized in that: The conveyor belt of the mesh belt conveyor (2) is a B-shaped metal mesh belt.

3. The SMT processing reflow oven with high operation safety according to claim 1, characterized in that: The bottom of each lower furnace bottom (102) is provided with a limitable universal wheel (8).

4. The SMT processing reflow oven with high operational safety according to claim 1, characterized in that: The connecting protrusion (5) is rectangular, and its free end is relatively narrow. The connection protrusion (5) is relatively wide at the fixing point with the lower furnace bottom (102). A sealing layer (9) is provided on the connecting protrusion (5), and the sealing layer (9) is bonded to the connecting protrusion (5).

5. The SMT processing reflow oven with high operation safety according to claim 1, characterized in that: Baffle bars (10) are fixedly provided on both sides of the conveying cavity (103) of each lower furnace bottom (102).

6. The SMT processing reflow oven with high operational safety according to claim 1, characterized in that: A sliding groove (11) is provided at the joint between the lower furnace bottom (102) and the upper furnace cover (101), and a sliding block (12) is provided on the upper furnace cover (101) for sliding in the sliding groove (11).

7. A reflow oven for SMT processing with high operational safety according to claim 6, characterized in that: A pulley (13) is installed at the position where the sliding block (12) abuts against the sliding groove (11), and the pulley (13) can support the upper furnace cover (101).

Images