Adjustable wave-soldering air knife

Abstract

The utility model discloses an adjustable wave-soldering air knife, and relates to the field of wave-soldering air knives. The adjustable wave-soldering air knife comprises an air knife shell, a containing cavity limited by the air knife shell and an adjustable porous air distribution assembly partially arranged in the containing cavity. The adjustable porous gas distribution assembly comprises an adjustable porous gas distribution mechanism, an adjusting and fixing mechanism and a feedback mechanism; the adjustable porous gas distribution mechanism comprises a gas inlet adjusting pipe, a bent pipe and a porous gas distribution pipe which is partially arranged in the accommodating cavity; the adjusting and fixing mechanism comprises a fixing pipe and a taper nut; the feedback mechanism is arranged between the fixing pipe and the air inlet adjusting pipe and can provide feedback information when at least one air outlet hole set passes through the air collecting opening. The problem that the air outlet effect of the wave-soldering air knife cannot be efficiently adjusted can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of wave soldering air knives, and particularly to an adjustable wave soldering air knife. Background Art

[0002] A wave soldering air knife is a device used in wave soldering equipment, mainly for improving welding quality and reducing welding defects. It generates a high-temperature gas flow that precisely acts on the solder position to be removed on electronic components, helping the excess solder to separate from the solder joints, thereby effectively reducing solder joint bridging defects and excessive solder fillet defects, and improving the via filling rate. The wave soldering air knife controls the temperature of the high-temperature gas through a heating system to ensure the efficiency and effect of the air knife. The high-temperature gas can be one or a mixture of nitrogen, argon, helium, or carbon dioxide, and its temperature is usually set at 0 to 300 °C above the solder melting point to meet different welding requirements. The application of the wave soldering air knife not only improves the welding efficiency but also reduces product quality problems caused by welding defects, which is an important technological improvement for the electronic assembly industry.

[0003] Existing wave soldering air knives generally include a housing, a cavity, and a porous tube. The housing is provided with an air knife inlet and an outlet, and the porous tube is provided with a number of through holes. The high-temperature gas enters the porous tube through the inlet and then blows out in a slit shape from the outlet to form an air knife. By adjusting the size and number of through holes on the porous tube, the gas flow rate and pressure can be controlled, thereby adjusting the outlet effect of the air knife to meet different welding requirements. This design enables the air knife to precisely reach the solder position to be removed, providing the necessary cutting force and temperature to promote the detachment of the solder.

[0004] However, in actual production, when different PCB boards are wave soldered, the welding requirements are often different. To meet various welding requirements, it is necessary to continuously adjust the outlet effect of the air knife. Existing wave soldering air knives usually need to replace the porous tube to achieve the purpose of adjusting the outlet effect of the air knife. Especially during the debugging stage, the porous tube needs to be frequently replaced. The replacement of the porous tube takes a lot of time, increases the labor cost, and reduces the production efficiency. Summary of the Utility Model

[0005] In order to solve the problem in the prior art that the outlet effect of the wave soldering air knife cannot be efficiently adjusted, the present application provides an adjustable wave soldering air knife, and the specific solution is as follows:

[0006] The adjustable wave soldering air knife includes: an air knife housing, a cavity defined by the air knife housing, and an adjustable porous air distribution assembly partially disposed in the cavity; the air knife housing includes an outlet part provided with an outlet and a housing part having the cavity therein, the housing part and the outlet part intersect to form a gas collecting port, and the outlet is in fluid communication with the cavity;

[0007] The adjustable porous gas distribution assembly includes an adjustable porous gas distribution mechanism, an adjustment and fixing mechanism, and a feedback mechanism;

[0008] The adjustable porous gas distribution mechanism includes an air intake adjustment pipe, a bent pipe, and a porous gas distribution pipe partially disposed in the cavity. The porous gas distribution pipe is in fluid communication with the air intake adjustment pipe through the bent pipe. The porous gas distribution pipe is provided with at least two groups of air outlet holes with different air outlet efficiencies. The bending angle of the bent pipe is 90° to 135°;

[0009] The adjustment and fixing mechanism is close to one end of the porous gas distribution pipe located outside the cavity and is fixedly connected to the accommodating part. The porous gas distribution pipe passes through the adjustment and fixing mechanism and is locked by the adjustment and fixing mechanism;

[0010] The feedback mechanism is disposed between the adjustment and fixing mechanism and the air intake adjustment pipe, and can provide feedback information when at least one group of air outlet holes passes through the air collecting port.

[0011] Preferably, the adjustment and fixing mechanism includes a fixing pipe with at least two pressing pieces at the tail and a taper nut threadedly connected to the fixing pipe. The head of the fixing pipe is fixedly connected to the air knife housing.

[0012] Preferably, the feedback mechanism includes an elastic spring and a convex block. The inner circumferential surface of the fixing pipe is provided with an accommodating groove. The convex block is disposed in the accommodating groove and is connected to the accommodating groove through the spring. The outer circumferential surface of the air intake adjustment pipe is provided with a plurality of limiting grooves. When at least one group of air outlet holes passes through the air collecting port, the spring extends to drive the convex block into the limiting groove.

[0013] Preferably, the number of the limiting grooves is the same as and corresponds to the number of the groups of air outlet holes one by one. When one of the groups of air outlet holes passes through the air collecting port, the convex block enters the limiting groove corresponding to the group of air outlet holes passing through the air collecting port.

[0014] Preferably, when the spring extends to drive the convex block into the limiting groove, the convex block fits with the limiting groove, and the surface where the convex block fits with the limiting groove is an arc surface.

[0015] Preferably, each group of the air outlet holes includes a plurality of air outlet through holes with the same aperture. The apertures of the air outlet through holes of any two groups of the air outlet holes are different, and the numbers of the air outlet through holes of any two groups of the air outlet holes are the same.

[0016] Preferably, each group of the air outlet holes includes a plurality of air outlet through holes with the same aperture. The apertures of the air outlet through holes of any two groups of the air outlet holes are the same, and the numbers of the air outlet through holes of any two groups of the air outlet holes are different.

[0017] Preferably, a washer is provided between the tapered nut and the air knife housing. When the tapered nut is tightened, the tapered nut presses against the washer.

[0018] Preferably, the end of the intake air regulating pipe located outside the cavity is fixedly connected to one end of the bent pipe, and the other end of the bent pipe is fixedly connected to any one end of the porous air distribution pipe.

[0019] Preferably, the bending angle of the bent pipe is 90°.

[0020] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0021] 1. By providing an adjustable porous air distribution assembly, the air outlet efficiency inside the wave soldering air knife can be conveniently adjusted, thereby controlling the air outlet effect of the wave soldering air knife, shortening the operation time, and improving the production efficiency.

[0022] 2. By rotating the adjustable porous air distribution mechanism, the air outlet efficiency inside the wave soldering air knife can be adjusted; by adjusting the fixing mechanism, the rotation of the adjustable porous air distribution mechanism can be restricted to fix the adjustable porous air distribution mechanism; by providing a feedback mechanism, information on the air outlet efficiency inside a specific wave soldering air knife can be fed back to facilitate fine control of the air outlet effect of the wave soldering air knife.

[0023] 3. The adjustable porous air distribution mechanism includes an intake air regulating pipe, a bent pipe, and a porous air distribution pipe. The bent pipe is used to connect the intake air regulating pipe and the porous air distribution pipe. The intake air regulating pipe serves as an inlet for external gas on the one hand and drives the porous air distribution pipe to rotate on the other hand. The rotation of the porous air distribution pipe can adjust the air outlet efficiency inside the wave soldering air knife.

[0024] 4. The porous air distribution pipe is provided with at least two groups of air outlet hole groups with different air outlet efficiencies, which can ensure a variety of air outlet efficiencies, thereby realizing fine control of the air outlet efficiency.

[0025] 5. When the bending angle of the bent pipe is 90° - 135°, an angle of 90° - 135° can be formed between the intake air regulating pipe and the porous air distribution pipe, which is convenient for driving the porous air distribution pipe to rotate through the intake air regulating pipe. The rotation of the intake air regulating pipe relative to the air knife housing can also feedback the relative position of the air outlet hole group.

[0026] 6. When at least one set of air outlet holes passes through the air collecting port, the feedback mechanism can extend the spring to drive the convex block into the limiting groove. On the one hand, the movement of the spring and the convex block can generate a sound. On the other hand, the limiting groove has a certain limiting effect on the convex block. The position information of the air outlet holes can be feedback through the sound and feel during rotation, so as to feedback the information of the internal air outlet efficiency of the specific wave soldering air knife. Further, by combining the position information of the intake air regulating pipe relative to the air knife housing after rotation, the external air outlet effect of the wave soldering air knife can be controlled more precisely;

[0027] 7. The surface where the convex block is in contact with the limiting groove is set as an arc surface, which can make it easier for the convex block to retract into the accommodating groove after being squeezed by the intake air regulating pipe.

[0028] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the embodiments of the present application. It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0030] Figure 1 It is a schematic structural view of one perspective of the adjustable wave soldering air knife of the present application.

[0031] Figure 2 It is a schematic structural view of another perspective of the adjustable wave soldering air knife of the present application.

[0032] Figure 3 It is of the present application Figure 2 Partial enlarged view of part I.

[0033] Figure 4 It is a schematic structural view of the air knife housing of the present application.

[0034] Figure 5 It is a schematic structural view of the adjustable multi-hole air distribution mechanism of the present application.

[0035] Figure 6 It is an installation schematic view of the adjustable wave soldering air knife of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0037] For an embodiment, please refer to Figure 1 and Figure 4 , the adjustable wave soldering air knife provided by the present application includes: an air knife housing 1, a cavity 111 defined by the air knife housing 1, and an adjustable porous air distribution assembly 2 partially disposed in the cavity 111; the air knife housing 1 includes an air outlet portion 12 provided with an air outlet 121 and a housing portion 11 having the cavity 111 therein, and the housing portion 11 and the air outlet portion 12 converge to form a gas collecting port 13, and the air outlet 121 is in fluid communication with the cavity 111;

[0038] Please refer to Figure 2 and Figure 3 , the adjustable porous air distribution assembly 2 includes an adjustable porous air distribution mechanism 21, an adjustment fixing mechanism 22, and a feedback mechanism 23;

[0039] Please refer to Figure 2 , Figure 3 and Figure 5 , the adjustable porous air distribution mechanism 21 includes an air intake adjustment pipe 213, a bent pipe 212, and a porous air distribution pipe 211. A part of the porous air distribution pipe 211 is inserted into the cavity 111 and is movably connected to the housing portion 11. Another part of the porous air distribution pipe 211 is located outside the cavity 111 and is in fluid communication with the air intake adjustment pipe 213 through the bent pipe 212. The porous air distribution pipe 211 is provided with at least two groups of air outlet hole groups 211-a with different air outlet efficiencies. The bending angle of the bent pipe 212 is 90°-135°. Specifically, as Figure 5 shown, in this embodiment, the bending angle of the bent pipe 212 is 90°. The air intake adjustment pipe 213 is limited by the cavity 111 and can rotate along its own axis in the cavity 111. By rotating the air intake adjustment pipe 213, the position of the air hole group 211-a relative to the gas collecting port 13 can be changed, so as to adjust the air outlet efficiency inside the wave soldering air knife. The bent pipe 212 is used to connect the air intake adjustment pipe 213 and the porous air distribution pipe 211. The air intake adjustment pipe 213 is, on the one hand, an access port for external gas, and on the other hand, drives the porous air distribution pipe 211 to rotate. Therefore, the rotation of the air intake adjustment pipe 213 can indirectly adjust the air outlet efficiency inside the wave soldering air knife;

[0040] Please refer to Figure 3, the adjustment and fixing mechanism 22 includes a fixing tube 221 and a taper nut 222. At the tail of the fixing tube 221, there are at least two pressing pieces 221-a arranged around the conical surface. The fixing tube 221 is threadedly connected to the taper nut 222. At the tail of the taper nut 222, there is a conical cavity for locking the pressing pieces 221-a. The head of the fixing tube 221 is fixedly connected to the air knife housing 1. The air intake adjustment tube 213 can pass through the fixing tube 221 and be locked by the pressing pieces 221-a;

[0041] Refer to Figure 3 , the feedback mechanism 23 is arranged between the adjustment and fixing mechanism 22 and the air intake adjustment tube 213, and can provide feedback information when at least one set of air outlet hole groups 211-a passes through the air collecting port 13.

[0042] Specifically, as Figure 3 shown, the feedback mechanism 23 includes an elastic spring and a convex block. A receiving groove is provided on the inner circumferential surface of the fixing tube 221. The convex block is arranged in the receiving groove and connected to the receiving groove through a spring. A plurality of limiting grooves are provided on the outer circumferential surface of the air intake adjustment tube 213. When at least one set of air outlet hole groups 211-a passes through the air collecting port 13, the spring extends to drive the convex block into the limiting groove.

[0043] Specifically, the number of the limiting grooves is the same as and corresponds one by one to the air outlet hole groups 211-a. When one set of the air outlet hole groups 211-a passes through the air collecting port 13, the convex block enters the limiting groove corresponding to the air outlet hole group 211-a passing through the air collecting port 13.

[0044] Specifically, when the spring extends to drive the convex block into the limiting groove, the convex block fits with the limiting groove, and the surface where the convex block fits with the limiting groove is an arc surface, so that it is easier for the convex block to retract into the receiving groove when leaving the limiting groove.

[0045] Optionally, each set of the air outlet hole groups 211-a includes a plurality of air outlet through holes 211-b with the same aperture. The apertures of the air outlet through holes 211-b of any two sets of the air outlet hole groups 211-a are different, and the number of the air outlet through holes 211-b of any two sets of the air outlet hole groups 211-a is the same. The aperture and number of the air outlet through holes 211-b of the air outlet hole group 211-a can determine the flow rate and pressure of the gas, thereby affecting the air outlet effect of the air knife. Therefore, the above settings for the aperture and number of the air outlet through holes 211-b can ensure that the air outlet efficiency of any two sets of the air outlet hole groups 211-a is different.

[0046] Optionally, each group of the air outlet hole groups 211-a includes a plurality of air outlet through holes 211-b with the same aperture. The apertures of the air outlet through holes 211-b of any two groups of the air outlet hole groups 211-a are the same, and the numbers of the air outlet through holes 211-b of any two groups of the air outlet hole groups 211-a are different. At this time, it can also be ensured that the air outlet efficiencies of any two groups of the air outlet hole groups 211-a are different.

[0047] Further, as Figure 3 shown, a washer 3 is provided between the taper nut 222 and the air knife housing 1. When the taper nut 222 is tightened, the taper nut 222 presses the washer 3 to reduce gas escape.

[0048] Optionally, the end of the air intake adjusting pipe 213 located outside the cavity 111 is fixedly connected to one end of the bent pipe 212, and the other end of the bent pipe 212 is fixedly connected to any one end of the porous air distribution pipe 211.

[0049] Referring to Figure 6 , the wave soldering air knife is usually installed below the conveyor belt 101. By blowing out high-temperature gas, it provides a cutting force and temperature that make the solder to be removed on the lower side of the PCB board 102 easier to fall off, so as to remove excess solder and reduce the occurrence of prematurely solidified solder, thereby effectively improving the welding quality. Therefore, the air outlet effect of the wave soldering air knife directly affects the welding quality. Obviously, the adjustment of the air outlet effect of the wave soldering air knife can improve the welding quality to a certain extent.

[0050] When it is necessary to adjust the air outlet effect of the wave soldering air knife, the taper nut 222 is adjusted to the loose state and the air intake adjusting pipe 213 is rotated. At this time, on the one hand, observe the position of the air intake adjusting pipe 213 relative to the air knife housing 1, and on the other hand, feel the feedback information of the feedback mechanism 23. After adjusting the desired air outlet hole group 211-a to the air collecting port 13, adjust the taper nut 222 to the tightened state, and the air intake adjusting pipe 213 is locked by the pressing piece 221-a to achieve fixation.

[0051] In summary, the present application can conveniently and efficiently adjust the air outlet effect of the wave soldering air knife, so as to adapt to different welding requirements and improve production efficiency.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0053] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of this application and its equivalent technologies, this application also intends to include these changes and variations.

Claims

1. Adjustable wave soldering air knife, characterized in that, Comprising: An air knife housing, a cavity defined by the air knife housing, and an adjustable porous air distribution assembly partially disposed in the cavity; the air knife housing includes an air outlet portion provided with an air outlet and a housing portion having the cavity therein, the housing portion and the air outlet portion converge to form a gas collecting port, and the air outlet is in fluid communication with the cavity; The adjustable porous air distribution assembly includes an adjustable porous air distribution mechanism, an adjustment and fixing mechanism, and a feedback mechanism; The adjustable porous air distribution mechanism includes an intake air adjustment pipe, a bent pipe, and a porous air distribution pipe partially disposed in the cavity. The porous air distribution pipe is in fluid communication with the intake air adjustment pipe through the bent pipe. The porous air distribution pipe is provided with at least two sets of air outlet holes with different air outlet efficiencies. The bending angle of the bent pipe is 90°-135°; The adjustment and fixing mechanism is close to one end of the porous air distribution pipe located outside the cavity and is fixedly connected to the housing portion. The porous air distribution pipe passes through the adjustment and fixing mechanism and is locked by the adjustment and fixing mechanism; The feedback mechanism is disposed between the adjustment and fixing mechanism and the intake air adjustment pipe, and can provide feedback information when at least one set of air outlet holes passes through the gas collecting port.

2. The adjustable wave soldering air knife according to claim 1, wherein The adjustment and fixing mechanism includes a fixing pipe having at least two pressing pieces at the tail and a taper nut threadedly connected to the fixing pipe. The head of the fixing pipe is fixedly connected to the air knife housing.

3. The adjustable wave soldering air knife according to claim 2, characterized in that, The feedback mechanism includes an elastic spring and a convex block. The inner circumferential surface of the fixing pipe is provided with a receiving groove. The convex block is disposed in the receiving groove and is connected to the receiving groove through the spring. The outer circumferential surface of the intake air adjustment pipe is provided with a plurality of limiting grooves. When at least one set of air outlet holes passes through the gas collecting port, the spring extends to drive the convex block into the limiting groove.

4. The adjustable wave soldering air knife according to claim 3, wherein The number of the limiting grooves is the same as and corresponds one-to-one to the number of the sets of air outlet holes. When one of the sets of air outlet holes passes through the gas collecting port, the convex block enters the limiting groove corresponding to the set of air outlet holes passing through the gas collecting port.

5. The adjustable wave soldering air knife according to claim 3 or 4, characterized in that When the spring extends to drive the convex block into the limiting groove, the convex block fits with the limiting groove, and the surface where the convex block fits with the limiting groove is an arc surface.

6. The adjustable wave soldering air knife according to claim 1, wherein, Each set of the air outlet holes includes a plurality of air outlet through holes with the same aperture. The apertures of the air outlet through holes of any two sets of the air outlet holes are different, and the number of the air outlet through holes of any two sets of the air outlet holes is the same.

7. The adjustable wave soldering air knife according to claim 1, wherein Each set of the air outlet holes includes a plurality of air outlet through holes with the same aperture. The apertures of the air outlet through holes of any two sets of the air outlet holes are the same, and the number of the air outlet through holes of any two sets of the air outlet holes is different.

8. The adjustable wave soldering air knife according to claim 2, wherein A washer is provided between the taper nut and the air knife housing. When the taper nut is tightened, the taper nut presses the washer.

9. The adjustable wave soldering air knife according to claim 1, wherein, The end of the intake air adjustment pipe located outside the cavity is tightly connected to one end of the bent pipe, and the other end of the bent pipe is tightly connected to any one end of the porous air distribution pipe.

10. The adjustable wave soldering air knife according to claim 1, wherein The bending angle of the bent pipe is 90°.

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