Quick-cooling plate discharging device of reflow furnace

Abstract

The utility model provides a reflow furnace quick-cooling plate discharging device which comprises an upper conveying device and a lower conveying device which are symmetrically arranged, cooling air ports are evenly distributed on the upper conveying device and the lower conveying device in the length direction, conveying rollers are evenly distributed on the upper conveying device and the lower conveying device, and the cooling air ports are aligned with the conveying rollers. The cooling and conveying device has the advantages that cold air is blown out through the cooling air openings aligned with the conveying rollers, conveying and cooling are achieved at the same time, and the technical problem that an existing cooling and conveying device at the plate discharging position of the reflow furnace is low in efficiency or high in cost is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of reflow furnaces, in particular to a reflow furnace rapid cooling and board discharging device. Background Art

[0002] The reflow oven process is to achieve the mechanical and electrical connection between the solder ends or pins of surface mounted components and the printed circuit board pads by re-melting the paste solder pre-dispensed on the printed circuit board pads.

[0003] Usually, a cooling device is set at the board exit of the reflow oven to cool the printed circuit board. The current cooling device is set on the upper and lower sides of a conveyor device through a cooling fan to cool the printed circuit board. Because cooling requires a certain amount of time, two cooling conveyor methods are usually used:

[0004] 1. The conveying device stops and the cooling device works to cool the printed circuit board at the cooling device position. This method will result in low conveying efficiency.

[0005] 2. The conveying device does not stop, but the width of the cooling device is increased along the conveying direction to perform multiple cooling, which will lead to an increase in costs.

[0006] In summary, the existing cooling and conveying devices at the board exit of the reflow furnace have technical problems of low efficiency or high cost. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a reflow furnace rapid cooling and board discharging device, which solves the technical problems of low efficiency or high cost of the existing cooling and conveying devices at the board discharging point of the reflow furnace.

[0008] According to an embodiment of the utility model, a reflow furnace rapid cooling and board-discharging device is described, comprising a symmetrically arranged upper conveying device and a lower conveying device, wherein cooling air outlets are evenly distributed along the length direction of the upper conveying device and the lower conveying device, and conveying rollers are evenly distributed on the upper conveying device and the lower conveying device, and the cooling air outlets are aligned with the conveying rollers.

[0009] The technical principle of the utility model is that after the printed board is conveyed out of the reflow furnace, it enters between the upper conveyor device and the lower conveyor device, and the cooling air outlet blows out cold air, and the friction between the cold air and the conveying roller is used to realize the rotation of the conveying roller, thereby causing the hard board to be conveyed forward, and at the same time the cold air will take away the heat on the printed board, thereby playing a cooling role.

[0010] Compared with the second cooling conveyor proposed in the background technology: no motor is needed to drive the upper conveyor and the lower conveyor, thereby reducing the cost. Therefore, the cost increase caused by the increase in the width of the cooling device is compensated by reducing the cost of the conveying part.

[0011] Compared with the first cooling conveying method proposed in the background technology, its conveying roller is always in operation, so the printed circuit board does not need to be stationary and then cooled, thereby having a higher conveying efficiency.

[0012] Compared with the prior art, the utility model has the following beneficial effects: cold air is blown out by the cooling air outlet aligned with the conveying roller to achieve conveying and cooling at the same time, which solves the technical problems of low efficiency or high cost of the cooling conveying device at the board outlet of the existing reflow furnace.

[0013] Furthermore, the upper conveying device and the lower conveying device are provided with a common support frame, the lower conveying device is fixed on the support frame, and the upper conveying device and the support frame are connected by an elastic structure.

[0014] Furthermore, the upper conveying device and the lower conveying device both include two mesh plates, and both ends of the conveying roller are movably mounted on the two mesh plates.

[0015] Furthermore, all the cooling air outlets are arranged on a cooling plate, the cooling plate is mounted on a support frame, a plurality of cooling pipes are evenly distributed on the cooling plate, the cooling pipes correspond to the cooling air outlets one by one, and all the cooling pipes are connected to cooling fans.

[0016] Furthermore, the upper conveying device and the lower conveying device also include a pusher, and wind shields are evenly distributed circumferentially on the pusher, the top of the wind shield is in close contact with the conveying roller, and the cooling air outlet is aligned between the conveying roller and the pushing roller.

[0017] Furthermore, a driving shaft is passed through the center of the pusher, and two ends of the driving shaft are movably mounted on two grid plates.

[0018] Furthermore, the conveying roller is evenly provided with friction grooves circumferentially.

[0019] Furthermore, the elastic structure is a tension spring, one end of which is connected to the grid plate of the upper conveying device, and the other end of which is connected to the support frame. A T-shaped block is provided on the grid plate of the upper conveying device, and a vertical T-shaped slot is provided on the support frame. The T-shaped block is movably installed in the T-shaped slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the reflow furnace rapid cooling board device of Example 1 of the utility model.

[0021] Figure 2 This is a schematic diagram of the connection structure between the upper conveying device and the lower conveying device in Example 1 of the utility model.

[0022] Figure 3This is a schematic diagram of the structure of the upper conveying device and the lower conveying device of Example 2 of the utility model.

[0023] Figure 4 This is a schematic diagram of the connection structure between the upper conveying device and the lower conveying device of Example 2 of the utility model.

[0024] Figure 5 This is a cross-sectional view of the conveying roller of Example 2 of the utility model.

[0025] In the above drawings: 100, support frame; 101, upper conveying device; 102, lower conveying device; 103, tension spring; 104, T-slot; 110, grid plate; 111, bearing; 112, T-block; 120, conveying roller; 121, friction groove; 130, cooling plate; 131, cooling air outlet; 132, cooling duct; 133, cooling fan; 140, pusher; 141, wind shield; 142, push shaft. DETAILED DESCRIPTION

[0026] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figure 1-2 The reflow furnace rapid cooling and board-discharging device shown includes an upper conveying device 101 and a lower conveying device 102 that are symmetrically arranged. The upper conveying device 101 and the lower conveying device 102 are provided with a common support frame 100, and the lower conveying device 102 is fixed on the support frame 100. The upper conveying device 101 and the support frame 100 are connected by an elastic structure, thereby ensuring that the upper conveying device 101 and the lower conveying device 102 can fit on the printed circuit board, ensuring that the printed circuit board can be conveyed and driven to move.

[0029] like Figure 1-2As shown, the upper conveying device 101 and the lower conveying device 102 both include two grid plates 110 and uniformly distributed conveying rollers 120, and the conveying rollers 120 are installed on the two grid plates 110 at both ends by bearings 111, wherein the upper conveying device 101 and the lower conveying device 102 are uniformly provided with cooling air outlets 131 along the length direction, and the cooling air outlets 131 are aligned with the conveying rollers 120, and specifically all the cooling air outlets 131 are arranged on a cooling plate 130, and the cooling plate 130 is installed on the support frame 100, and the cooling plate 130 is welded and fixed with uniformly distributed Dry cooling pipe 132, cooling pipe 132 corresponds to cooling air outlet 131 one by one, all cooling pipes 132 are connected to cooling fan 133, and then cooling fan 133 can blow cold air through cooling pipe 132, from cooling air outlet 131 to conveying roller 120, wherein bearing 111 reduces the friction between conveying roller 120 and grid plate 110 to the greatest extent, ensuring that cold air can blow conveying roller 120, and grid plate 110 makes the cold air blown out take away the heat of printed circuit board and then blow out to its grid, thereby forming a complete wind path.

[0030] like Figure 2 As shown, the elastic structure is a tension spring 103, one end of the tension spring 103 is connected to the grid plate 110 of the upper conveyor 101 by rivets, and the other end of the tension spring 103 is connected to the support frame 100 by screws. A T-block 112 is welded on the grid plate 110 of the upper conveyor 101, and a vertical T-slot 104 is provided on the support frame 100. The T-block 112 is movably installed in the T-slot 104. The specific tension spring 103 ensures that there is a gap between the conveying roller 120 of the upper conveyor 101 and the conveying roller 120 of the lower conveyor 102. When the printed circuit board enters, it will be slightly deformed, so that the conveying roller 120 of the upper conveyor 101 and the conveying roller 120 of the lower conveyor 102 can be lightly pressed on the printed circuit board.

[0031] The technical solution in Example 1 is only suitable for processing small printed circuit boards. When large printed circuit boards are transported, the problem of being unable to be transported will occur.

[0032] Example 2

[0033] This embodiment is used to solve the technical problem of large printed boards being unable to be transported in the first embodiment, and the specific differences are as follows:

[0034] like Figure 3-4As shown, the upper conveying device 101 and the lower conveying device 102 also include a pusher 140, wherein wind shields 141 are evenly distributed circumferentially on the pusher 140, the top of the wind shield 141 is close to the conveying roller 120, and the cooling air outlet 131 is aligned between the conveying roller 120 and the pushing roller. Specifically, a driving shaft 142 is passed through the center of the pusher 140, and both ends of the driving shaft 142 are installed on two grid plates 110 by bearings 111, that is, the cooling air outlet 131 blows wind to the wind shield 141, and when the wind shield 141 rotates, the conveying roller 120 is driven to rotate, that is, the wind force of the cold wind is improved, and then the transmission of the printed circuit board can be realized.

[0035] like Figure 5 As shown, the conveying roller 120 is evenly distributed with friction grooves 121 in the circumferential direction, that is, the friction between the conveying roller 120 and the wind shield 141 is increased, thereby better driving the conveying roller 120.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A reflow furnace rapid cooling device, characterized in that: It comprises an upper conveying device and a lower conveying device which are symmetrically arranged. The upper conveying device and the lower conveying device are evenly provided with cooling air outlets along the length direction. The upper conveying device and the lower conveying device are evenly provided with conveying rollers, and the cooling air outlets are aligned with the conveying rollers.

2. A reflow furnace rapid cooling board device as claimed in claim 1, characterized in that: The upper conveying device and the lower conveying device are provided with a common supporting frame, the lower conveying device is fixed on the supporting frame, and the upper conveying device and the supporting frame are connected by an elastic structure.

3. A reflow furnace rapid cooling board device as claimed in claim 2, characterized in that: The upper conveying device and the lower conveying device both include two mesh plates, and the two ends of the conveying roller are movably mounted on the two mesh plates.

4. A reflow furnace rapid cooling board device as claimed in claim 2, characterized in that: All the cooling air outlets are arranged on a cooling plate, the cooling plate is mounted on a support frame, a plurality of cooling pipes are evenly distributed on the cooling plate, the cooling pipes correspond to the cooling air outlets one by one, and all the cooling pipes are connected to cooling fans.

5. A reflow furnace rapid cooling board device as claimed in claim 3, characterized in that: The upper conveying device and the lower conveying device also include a pusher, and wind shields are evenly distributed circumferentially on the pusher. The top of the wind shield is in close contact with the conveying roller, and the cooling air outlet is aligned between the conveying roller and the pushing roller.

6. A reflow furnace rapid cooling board device as claimed in claim 5, characterized in that: A driving shaft is provided at the center of the pusher, and two ends of the driving shaft are movably mounted on two grid plates.

7. A reflow furnace rapid cooling board device as claimed in claim 5, characterized in that: The conveying roller is provided with friction grooves evenly distributed circumferentially.

8. A reflow furnace rapid cooling board device as claimed in claim 3, characterized in that: The elastic structure is a tension spring, one end of which is connected to the grid plate of the upper conveying device, and the other end of which is connected to the support frame. A T-shaped block is provided on the grid plate of the upper conveying device, and a vertical T-shaped slot is provided on the support frame. The T-shaped block is movably installed in the T-shaped slot.

Images