Linear air knife and PCB drying equipment

Abstract

The utility model discloses a linear air knife and a PCB (printed circuit board) drying device, comprising: an outer shell, a hollow flow space formed inside the outer shell, an air inlet and an air outlet formed on the outer shell, the air inlet and the air outlet being opposite and communicated with the flow space; the guide structure is arranged at the air outlet of the outer shell, the guide structure is provided with an overflowing part and guide parts, the guide parts are located on the two sides of the overflowing part, and the overflowing part is communicated with the air outlet; the sectional area of the flowing space is gradually reduced from the direction of the air inlet to the direction of the air outlet; the air knife can solve the problem that a traditional linear air knife cannot stretch into the space between adjacent conveying rollers of PCB conveying equipment, so that a PCB is prone to falling off through a gap under airflow disturbance.

Description

Technical Field

[0001] The utility model relates to the field of printed circuit board production equipment, in particular to a linear air knife and a PCB board drying device. Background Art

[0002] Air knives are widely used in the industrial field and can be used for operations such as cleaning, drying, dust removal, and static elimination.

[0003] When producing PCB boards, it is necessary to air-dry the cleaned PCB boards. Conventional linear air knives are provided with long-strip-shaped air nozzles. When the PCB circuit board needs to be dried, the air curtain blown out through the air knife nozzles blows over the surface of the PCB circuit board to dry it. However, due to the presence of a conveying gap between adjacent conveying rollers for conveying the PCB board, the PCB board is disturbed by the airflow blown out by the air knife, and there is a phenomenon of falling through the conveying gap, which affects the drying efficiency of the PCB board. Summary of the Utility Model

[0004] The utility model aims to solve the above technical problems, that is, the traditional linear air knife cannot extend between adjacent conveying rollers of the PCB board conveying device, resulting in the problem that the PCB board is prone to fall through the gap under the disturbance of the airflow.

[0005] In a first aspect, the utility model provides a linear air knife, comprising:

[0006] An outer housing, a hollow flow space is formed inside the outer housing, and an air inlet and an air outlet communicating with the flow space are formed on the outer housing;

[0007] A guiding structure, the guiding structure is arranged at the air outlet of the outer housing, the guiding structure has a flow-through part and guiding parts, the guiding parts are located on both sides of the flow-through part, and the flow-through part communicates with the air outlet;

[0008] Wherein, the cross-sectional area of the flow space gradually decreases from the air inlet direction to the air outlet direction.

[0009] In a preferred technical solution of the above linear air knife, the air outlet is a long-strip-shaped opening, and the width of the air outlet is 0.5 - 1.5 mm.

[0010] In a preferred technical solution of the above linear air knife, the guiding part is bent from the air outlet direction towards the air inlet direction at one end away from the flow-through part.

[0011] In a preferred technical solution of the above linear air knife, an air inlet pipe is arranged at the air inlet of the outer housing.

[0012] In the preferred technical solution of the above linear air knife, the air inlet pipe is welded to the air inlet of the outer housing.

[0013] In the preferred technical solution of the above linear air knife, the flow-through part of the guiding structure and the guiding part are integrally formed.

[0014] In the preferred technical solution of the above linear air knife, the flow-through part of the guiding structure is welded at the air outlet of the outer housing.

[0015] In the preferred technical solution of the above linear air knife, the outer housing is made of stainless steel.

[0016] In the preferred technical solution of the above linear air knife, the thickness of the outer housing is 2 - 10 mm.

[0017] In a second aspect, the present utility model further provides a PCB board drying device, which includes the above linear air knife, and further includes a first conveying roller and a second conveying roller arranged in parallel. A conveying gap is formed between the first conveying roller and the second conveying roller, and the guiding structure of the linear air knife extends into the conveying gap.

[0018] The beneficial effect of the present utility model is that by providing a guiding structure with a guiding part and a flow-through part at the air outlet of the outer housing, the guiding part is used to pre-guide the PCB board conveyed above the guiding structure, avoiding the problem that the PCB board slips due to the existence of gaps in the structure for conveying the PCB board, and effectively improving the use effect and application range of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the front view of the present utility model;

[0020] Figure 2 is the front elevation view of the present utility model;

[0021] Figure 3 is the sectional view of the present utility model;

[0022] Figure 4 is the schematic diagram of the guiding structure;

[0023] Figure 5 is the positional relationship diagram of the first conveying roller, the second conveying roller and the linear air knife;

[0024] In the figure: outer housing 1, flow space 2, air inlet 3, air outlet 4, guiding structure 5, flow-through part 51, guiding part 52, air inlet pipe 6, first conveying roller 7, second conveying roller 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0026] It should be noted that in the description of the present utility model, the terms "upper", "lower", "left", "right", "front", "rear" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "set", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] See Figures 1 to 4 , the linear air knife of the present utility model includes: a housing 1, a hollow flow space 2 is formed inside the housing 1, and an air inlet 3 and an air outlet 4 communicating with the flow space 2 are formed on the housing 1; a guiding structure 5, the guiding structure 5 is disposed at the air outlet 4 of the housing 1, the guiding structure 5 has a flow-through portion 51 and a guiding portion 52, the guiding portion 52 is located on both sides of the flow-through portion 51, and the flow-through portion 51 communicates with the air outlet 4; wherein, the cross-sectional area of the flow space 2 gradually decreases from the direction of the air inlet 3 towards the direction of the air outlet 4.

[0029] See Figure 1 , Figure 2 , the housing 1 is in a long strip shape, a hollow flow space 2 is formed inside the housing 1, and the cross-section of the flow space 2 along the height direction of the housing 1 is approximately in a conical structure. Among them, the air inlet 3 is disposed at the bottom of the housing 1, and the air outlet 4 is disposed at the top of the housing 1, that is, the air inlet 3 is disposed at the bottom inlet of the flow space 2, and the air outlet 4 is disposed at the top outlet of the flow space 2. Through this kind of setting, after the air flow enters the flow space 2 through the air inlet 3, under the restriction of the flow space 2 with gradually decreasing volume, the pressure of the air flow discharged through the air outlet 4 can be increased. At the same time, through this kind of setting, it can be ensured that the pressure inside the flow space 2 is greater than the pressure outside the housing 1, so that the air flow is evenly distributed in the flow space 2, thereby further improving the uniformity of the air flow blown out through the air outlet 4.

[0030] See Figure 3 ,Figure 4 , the guiding structure 5 includes a current-carrying part 51 and a guiding part 52. The current-carrying part 51 has an opening with the same structure as the air outlet 4 of the outer housing 1. When the guiding structure 5 is installed on the outer housing 1, the opening of the current-carrying part 51 coincides with the air outlet 4 of the outer housing 1, enabling the air flow inside the outer housing 1 to blow out to the outside through the air outlet 4 and the opening of the current-carrying part 51; the guiding part 52 is located on both sides of the current-carrying part 51. The guiding part 52 can be in the shape of a long plate or several spaced-apart protrusions. The guiding part 52 is used to pre-guide the PCB board conveyed above the guiding structure 5, avoiding the problem that the PCB board slips due to gaps in the structure for conveying the PCB board, and effectively improving the use effect and application range of the present application.

[0031] In one or more embodiments, the air outlet 4 is a long strip-shaped opening, and the width of the air outlet 4 is 0.5 - 1.5 mm. Refer to Figure 1 , by configuring the air outlet 4 into a long strip shape, the air flow in the flow space 2 of the outer housing 1 can be smoothly discharged through the air outlet 4, ensuring the air volume discharged through the air outlet 4 and the blowing and drying effect of the air flow on the PCB board. In a specific embodiment, the width of the air outlet 4 is 1 mm.

[0032] In one or more embodiments, the guiding part 52 is bent from the direction of the air outlet 4 towards the direction of the air inlet 3 at one end away from the current-carrying part 51.

[0033] It should be noted that when the air flow blown upward through the current-carrying part 51 reaches the PCB board, part of the air flow will be blocked by the PCB board and blown towards the guiding structure 5. When the air flow returns to the guiding structure 5, the bent guiding part 52 can guide the air flow to both sides of the guiding structure 5, reducing the vibration caused by the impact of the two air flows and then affecting the drying effect on the PCB board, and improving the use effect of the present application.

[0034] In one or more embodiments, the outer housing 1 is provided with an air inlet pipe 6 at the air inlet 3; the air inlet pipe 6 is welded to the air inlet 3 of the outer housing 1.

[0035] Refer to Figure 2 , the air inlet pipe 6 is a bent pipe, and the air inlet pipe 6 is welded at the air inlet 3 of the outer housing 1. Through this setting, the connection stability between the air inlet pipe 6 and the outer housing 1 can be improved, and the abnormal noise generated when air enters the outer housing 1 can be reduced.

[0036] In other possible embodiments, the air inlet pipe 6 and the air inlet 3 of the outer housing 1 are in threaded connection.

[0037] In one or more embodiments, the flow-through portion 51 of the guiding structure 5 and the guiding portion 52 are integrally formed. The flow-through portion 51 and the guiding portion 52 of the guiding structure 5 are integrally formed by stamping; with this arrangement, the forming efficiency of the guiding structure 5 can be increased, and at the same time, the connection strength between the flow-through portion 51 and the guiding portion 52 can be ensured.

[0038] In one or more embodiments, the flow-through portion 51 of the guiding structure 5 is welded to the air outlet 4 of the outer casing 1. With this arrangement, the connection stability between the guiding structure 5 and the outer casing 1 can be improved.

[0039] In one or more embodiments, the outer casing 1 is made of stainless steel. With this arrangement, the problem of rusting of the outer casing 1 can be reduced, the problem of the air flow blown out through the outer casing 1 polluting the PCB board can be avoided, and the use effect of the present application can be improved.

[0040] In one or more embodiments, the thickness of the outer casing 1 is 2 - 10 mm. In a specific embodiment, the thickness of the outer casing 1 is 4 mm.

[0041] In a possible embodiment, a flow dividing plate is installed along the length direction of the outer casing 1 in the flow space 2 of the outer casing 1, and the flow dividing plate is relatively close to the air inlet 3.

[0042] The flow dividing plate is not shown in the drawings, and the cross-section of the flow dividing plate is generally in a rhombus structure. When the air flow enters the flow space 2 through the air inlet 3, the air flow will be divided by the flow dividing plate to both sides of it. As the air flow flows, the air flow then converges from the direction close to the outside of the outer casing 1 towards the middle of the outer casing 1. With this arrangement, more of the air flow at the air inlet 3 can be divided to both ends of the outer casing 1 in the length direction, ensuring the stability and consistency of the air flow blown out at each position of the air outlet 4, and improving the consistency of drying each position of the PCB board in the present application.

[0043] In addition, referring to Figure 5 , the present utility model further provides a PCB board drying device, which has the linear air knife in any of the above embodiments, and further includes a first conveying roller 7 and a second conveying roller 8 arranged in parallel. A conveying gap is formed between the first conveying roller 7 and the second conveying roller 8, and the guiding structure 5 of the linear air knife extends into the conveying gap.

[0044] Referring to Figure 5, the first conveying roller 7 and the second conveying roller 8 can rotate to realize the rolling conveyance of the PCB board. To prevent the PCB board from falling into the conveying gap between the first conveying roller 7 and the second conveying roller 8, the guiding structure 5 of the linear air knife is extended into the conveying gap, so that the guiding part 52 of the guiding structure 5 forms a preliminary support for the PCB board, avoiding the problem that the PCB board falls through the conveying gap between the first conveying roller 7 and the second conveying roller 8 during conveyance.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A linear air knife, characterized in that: include: An outer shell, wherein a hollow flow space is formed inside the outer shell, and an air inlet and an air outlet are formed on the outer shell and are opposite to each other and communicate with the flow space; A guide structure, the guide structure is arranged at the air outlet of the outer shell, the guide structure has a flow-through portion and a guide portion, the guide portion is located on both sides of the flow-through portion, and the flow-through portion is communicated with the air outlet; Wherein, the cross-sectional area of ​​the flow space gradually decreases from the air inlet direction toward the air outlet direction.

2. The linear air knife according to claim 1, characterized in that: The air outlet is a long strip-shaped opening, and the width of the air outlet is 0.5-1.5 mm.

3. The linear air knife according to claim 1, characterized in that: The guide portion is bent from the air outlet direction toward the air inlet direction at an end away from the flow-through portion.

4. The linear air knife according to claim 1, characterized in that: The outer shell is provided with an air inlet pipe at the air inlet.

5. The linear air knife according to claim 4, characterized in that: The air inlet pipe is welded to the air inlet of the outer shell.

6. The linear air knife according to claim 1, characterized in that: The flow-through portion of the guide structure is welded at the air outlet of the outer shell.

7. The linear air knife according to claim 1, characterized in that: The flow-through portion of the guide structure is integrally formed with the guide portion.

8. The linear air knife according to claim 1, characterized in that: The outer shell is made of stainless steel.

9. The linear air knife according to claim 1, characterized in that: The thickness of the outer shell is 2-10 mm.

10. A PCB board drying device, characterized in that: The linear air knife comprises any one of claims 1 to 9, further comprising a first conveying roller and a second conveying roller arranged in parallel, a conveying gap is formed between the first conveying roller and the second conveying roller, and a guide structure of the linear air knife extends into the conveying gap.

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