Wind speed control mechanism for reflow soldering

Abstract

The utility model provides an air speed control mechanism for reflow soldering, and aims to solve the technical problems that in a reflow soldering machine, the air speed of hot air is not easy to control, and parts are easy to blow away. The mechanism comprises an air duct arranged above a welding area in the reflow soldering machine, and a fan is arranged at the top of the air duct; the two main shafts are rotationally arranged in the middle of the air duct, and one main shaft penetrates through the air duct and is arranged on the back of the air duct; one ends of the two baffles are arranged on the two main shafts respectively to form a V-shaped structure, and a plurality of ventilation holes are formed in the baffles; the spring is located in the V-shaped structure, and the two ends of the spring are arranged on the two baffles respectively; the gear is coaxially arranged at one end, penetrating through the air duct, of the main shaft; the rack is slidably arranged on the back surface of the air duct and engaged with the gear; the rheostat is parallel to the rack and arranged on the back of the air duct, and a slip sheet is arranged on the rack; wherein the rheostat is connected in series with a power supply line of the fan. The mechanism has the advantages that the hot air speed can be controlled in real time, and parts are prevented from being blown away.

Description

Technical Field

[0001] The utility model relates to a reflow soldering machine, in particular to a wind speed control mechanism for reflow soldering. Background Art

[0002] In the SMT process, reflow soldering technology plays a pivotal role. Its purpose is to fuse the SMD components with the circuit board pads. A good reflow soldering process plays a decisive role in product reliability, life cycle and other aspects.

[0003] The hot air speed of the reflow soldering machines currently in use is difficult to control. When the hot air speed is too high, the parts will be blown away, resulting in soldering failure. Utility Model Content

[0004] Aiming at the technical problem that the hot air speed in the reflow soldering machine is difficult to control and parts are easily blown away, the utility model provides a reflow soldering wind speed control mechanism, which has the advantage of being able to control the hot air speed in real time and prevent parts from being blown away.

[0005] The technical solution of the utility model is:

[0006] A wind speed control mechanism for reflow soldering, comprising:

[0007] An air duct is arranged above the welding area in the reflow soldering machine, and a fan is arranged on the top of the air duct;

[0008] Two main shafts are rotatably disposed in the middle of the air duct and close to each other, one of the main shafts passes through the air duct and is disposed at the back of the air duct;

[0009] Two baffles, one end of each of the two baffles is respectively arranged on the two main shafts to form a V-shaped structure, the open end of the V-shaped structure is away from the fan, and the baffles are provided with a plurality of ventilation holes;

[0010] A spring is located in the V-shaped structure, and two ends of the spring are respectively arranged on the two baffles;

[0011] a gear coaxially disposed on one end of a main shaft passing through the air duct;

[0012] A rack, slidably disposed on the back of the air duct and meshing with the gear;

[0013] A rheostat is arranged on the back of the air duct parallel to the rack, and a sliding piece of the rheostat is arranged on the rack;

[0014] Wherein, the variable resistor is connected in series to the power supply line of the fan.

[0015] Optionally, a triangular prism-shaped flow divider is provided in the air duct, the flow divider is provided between the main shaft and the fan, and a side surface of the flow divider is parallel to the plane where the axes of the two main shafts are located.

[0016] Optionally, the gear is a fan-shaped structure;

[0017] When one end of the baffle away from the main shaft contacts the inner wall of the air duct, one end of the gear tooth surface meshes with one end of the rack.

[0018] Optionally, a support rod is provided at one end of the rack, and the slide is provided at an end of the support rod away from the rack.

[0019] Optionally, a pressure rod is slidably provided on one end of the support rod away from the rack, the pressure rod is perpendicular to the rack and the support rod, the sliding sheet is provided at the end of the pressure rod, and a compression spring is provided on the pressure rod.

[0020] Optionally, an L-rod is provided in the middle of the support rod, an end of the pressure rod away from the slide passes through the L-rod, and the compression spring is sleeved on the pressure rod and arranged between the L-rod and the support rod.

[0021] Optionally, a track is provided on the back side of the air duct, and the rack is slidably arranged on the track.

[0022] Optionally, the air duct is a Y-shaped structure, the size of one end of the air duct where the fan is installed is larger than the size of the other end, and the baffle is arranged in the end of the air duct with a smaller size.

[0023] Optionally, when one end of the two baffles away from the main shaft contacts the inner wall of the air duct, an angle between the two baffles is less than 120°.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] A main shaft is set in the air duct of the reflow soldering machine, and two baffles are respectively set on the two main shafts in a V-shaped structure, so that the two baffles can rotate, and at the same time, the two baffles are kept in the V-shaped structure by the spring tendency. Since there are ventilation holes on the two baffles, warm air can be sent into the welding area under the action of the fan.

[0026] When the wind volume is too large, the airflow pushes the baffle, making the distance between the two baffles smaller, so that the main shaft driving gear passing through the air duct rotates, and the gear drives the rack to move in a straight line, so that the slider on the rheostat moves, thereby increasing the resistance on the fan power supply line, and reducing the wind speed of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the utility model;

[0029] Figure 2 It is a structural schematic diagram of a single air duct;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of a single air duct;

[0031] Figure 4 Schematic diagram of the back structure of the air duct;

[0032] Figure 5 It is a schematic diagram of the structure of the gear and the baffle;

[0033] Figure 6 It is a schematic diagram of the three-dimensional structure of the back side of the air duct. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0036] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0037] Example:

[0038] See also Figure 1-Figure 6A wind speed control mechanism for reflow soldering includes an air duct 1, a main shaft 2, a baffle 3, a spring 4, a gear 5, a rack 6 and a rheostat 7. Specifically, the air duct 1 is arranged above the welding area in the reflow soldering machine, and the air outlet of the air duct 1 faces the welding area. A fan 8 is arranged on the top of the air duct 1, and a heating component similar to a heating wire is arranged near the fan 8. Generally, a plurality of air ducts 1 are arranged side by side inside the reflow soldering machine, and each air duct 1 is correspondingly provided with a fan 8.

[0039] Two main shafts 2 are rotatably arranged in the air duct 1, and the two main shafts 2 are parallel to each other, close to each other and located in the middle of the air duct 1. The axis of the main shaft 2 is perpendicular to the air flow direction in the air duct 1. One end of one of the main shafts 2 passes through the air duct 1 and is placed on the back of the air duct 1.

[0040] Two baffles 3 are respectively arranged on the two main shafts 2, and the ends of the two baffles 3 away from the main shafts 2 are respectively in contact with the two side walls of the air duct 1, so that the two baffles 3 form a V-shaped structure, and the open end of the V-shaped structure is away from the fan 8. When the ends of the two baffles 3 away from the main shafts 2 are in contact with the inner wall of the air duct 1, the angle between the two baffles 3 is less than 120°. Both baffles 3 have a plurality of ventilation holes 9.

[0041] A spring 4 is arranged in the V-shaped structure formed by the two baffles 3 . Two ends of the spring 4 are respectively connected to the two baffles 3 , and the spring 4 is close to one end of the baffle 3 away from the main shaft 2 .

[0042] A gear 5 is provided at the end of the main shaft 2 that passes through the back of the air duct 1 , and a rack 6 is slidably provided on the back of the air duct 1 , and the rack 6 meshes with the gear 5 .

[0043] The rheostat 7 is arranged on the back of the air duct 1 and is arranged parallel to the rack 6, and there is a gap between the rheostat 7 and the rack 6. The slider of the rheostat 7 is fixedly arranged on one end of the rack 6, and the rheostat 7 is connected in series to the power supply line of the fan 8.

[0044] The working principle of this embodiment is that a main shaft 2 is set in the air duct 1 of the reflow soldering machine, and two baffles 3 are respectively set on the two main shafts 2 in a V-shaped structure, so that the two baffles 3 can rotate, and at the same time, the two baffles 3 are tended to maintain the V-shaped structure through the spring 4. Since there are ventilation holes 9 on the two baffles 3, warm air can be sent into the welding area under the action of the fan 8.

[0045] When the air volume is too large, the airflow pushes the baffle 3, making the distance between the two baffles 3 smaller, so that the main shaft 2 passing through the air duct 1 drives the gear 5 to rotate, and the gear 5 drives the rack 6 to move linearly, so that the slider on the rheostat 7 moves, thereby increasing the resistance on the power supply line of the fan 8, and reducing the wind speed of the fan 8. When the wind speed decreases, the spring 4 will drive the angle between the two baffles 3 to increase. In this process, the thrust generated by the fan 8 and the elastic force of the spring 4 will reach a balance point. By designing the size of the ventilation hole 9, the air volume and wind speed can meet the welding requirements.

[0046] Preferably, a track 10 is provided on the back of the air duct 1, and the rack 6 is slidably arranged on the track 10. The air duct 1 is a Y-shaped structure, and the size of one end of the air duct 1 where the fan 8 is installed is larger than the size of the other end, and the baffle 3 is arranged in the end of the air duct 1 with a smaller size.

[0047] In one specific embodiment:

[0048] A triangular prism-shaped flow divider 11 is arranged inside the air duct 1 , and the cross section of the flow divider 11 is an isosceles triangle.

[0049] The plane between the two waists of the flow divider 11 is assumed to be the bottom surface, which is parallel to the plane where the axes of the two main shafts 2 are located. Meanwhile, the intersection line of the plane where the two waists of the flow divider 11 are located is close to the fan 8 .

[0050] In this embodiment, by providing the flow divider 11 , it is possible to avoid the two main shafts 2 interfering with the air flow in the air duct 1 .

[0051] In another specific embodiment:

[0052] The gear 5 is a fan-shaped structure. When the end of the baffle 3 away from the main shaft 2 contacts the inner wall of the air duct 1, one end of the tooth surface of the gear 5 meshes with one end of the rack 6. At this time, a sliding plate is set at the other end of the rack 6 and contacts the end of the rheostat 7 with a resistance value of 0.

[0053] In this embodiment, by configuring the gear 5 to be a fan-shaped structure, the mass of the gear 5 can be reduced, thereby reducing the hindering effect of the gear 5 on the rotation of the main shaft 2.

[0054] In another specific embodiment:

[0055] A support rod 12 is provided at one end of the rack 6 , and a pressure rod 13 is slidably provided on the end of the support rod 12 away from the rack 6 . The pressure rod 13 is perpendicular to both the rack 6 and the support rod 12 , and a sliding sheet is provided at the end of the pressure rod 13 .

[0056] An L-rod 14 is provided in the middle of the support rod 12. The L-rod 14 and the support rod 12 form an H-shaped structure. The end of the pressure rod 13 away from the slide passes through one end of the L-rod 14, and a compression spring 15 is sleeved on the pressure rod 13. A limit plate is provided on a section of the pressure rod 13 between the L-rod 14 and the support rod 12, and the compression spring 15 is located between the L-rod 14 and the limit plate.

[0057] In this embodiment, the slide is arranged on the movable pressure rod 13 and a pressure spring 15 is arranged on the pressure rod 13, so that the slide is allowed to jump during the sliding process, thereby increasing the fault tolerance during the movement of the slide.

[0058] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A wind speed control mechanism for reflow soldering, characterized in that: include: An air duct is arranged above the welding area in the reflow soldering machine, and a fan is arranged on the top of the air duct; Two main shafts are rotatably disposed in the middle of the air duct and close to each other, one of the main shafts passes through the air duct and is disposed at the back of the air duct; Two baffles, one end of each of the two baffles is respectively arranged on the two main shafts to form a V-shaped structure, the open end of the V-shaped structure is away from the fan, and the baffles are provided with a plurality of ventilation holes; A spring is located in the V-shaped structure, and two ends of the spring are respectively arranged on the two baffles; a gear coaxially disposed on one end of a main shaft passing through the air duct; A rack, slidably disposed on the back of the air duct and meshing with the gear; A rheostat is arranged on the back of the air duct parallel to the rack, and a sliding piece of the rheostat is arranged on the rack; Wherein, the variable resistor is connected in series to the power supply line of the fan.

2. The wind speed control mechanism for reflow soldering according to claim 1, characterized in that: A triangular prism-shaped flow divider is provided in the air duct, and the flow divider is provided between the main shaft and the fan, and a side surface of the flow divider is parallel to the plane where the axes of the two main shafts are located.

3. The wind speed control mechanism for reflow soldering according to claim 1, characterized in that: The gear is a fan-shaped structure; When one end of the baffle away from the main shaft contacts the inner wall of the air duct, one end of the gear tooth surface meshes with one end of the rack.

4. The wind speed control mechanism for reflow soldering according to claim 1, characterized in that: A support rod is arranged at one end of the rack, and the slide is arranged at one end of the support rod away from the rack.

5. The wind speed control mechanism for reflow soldering according to claim 4, characterized in that: A pressure rod is slidably provided on one end of the support rod away from the rack, the pressure rod is perpendicular to the rack and the support rod, the sliding sheet is arranged at the end of the pressure rod, and a compression spring is arranged on the pressure rod.

6. The wind speed control mechanism for reflow soldering according to claim 5, characterized in that: An L rod is arranged in the middle of the support rod, one end of the pressure rod away from the slide passes through the L rod, and the compression spring is sleeved on the pressure rod and arranged between the L rod and the support rod.

7. The wind speed control mechanism for reflow soldering according to claim 1, characterized in that: A track is provided on the back of the air duct, and the rack is slidably arranged on the track.

8. The wind speed control mechanism for reflow soldering according to claim 1, characterized in that: The air duct is a Y-shaped structure, the size of one end of the air duct where the fan is installed is larger than the size of the other end, and the baffle is arranged in the end of the air duct with a smaller size.

9. The wind speed control mechanism for reflow soldering according to claim 1, characterized in that: When one end of the two baffles away from the main shaft contacts the inner wall of the air duct, the angle between the two baffles is less than 120°.

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