Soldering pipe

Abstract

To provide a soldering pipe in which a solder piece is hardly adhere into a pipe even if the solder piece contacts an inner wall surface of the pipe.SOLUTION: A soldering pipe has: a first cylindrical pipe which has such an inner diameter that the solder piece can drop; a second cylindrical pipe which has such an inner diameter that the solder piece can drop, and is located below the first pipe; a heat insulation member in which an insertion part in which a lower end part of the first pipe is inserted and a fitting part in which an upper end part of the second pipe is fitted are formed, and the insertion part and the fitting part are connected, whereby an open hole is formed; and heating means for heating the second pipe that is located around the second pipe. A lower end surface of the lower end part of the first pipe is located in vicinity of an upper end surface of the upper end part of the second pipe, an outer peripheral surface of the lower end part of the first does not contact an inner peripheral surface of the insertion part, and an inner diameter of the lower end part of the first pipe is an inner diameter or less of the upper end part of the second pipe.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a direct heat soldering pipe that is attached to an apparatus for melting cut wire solder and performing soldering.

Background Art

[0002] There is known a soldering apparatus including a cutter unit for cutting wire solder, a cylinder having an inner diameter through which the cut wire solder (hereinafter also referred to as a solder piece) can fall and both ends of which are open, and a heater (heating means) for melting the solder piece at the tip of the cylinder (see Patent Document 1). In this soldering apparatus, the cut solder piece falls from a through-hole above the cylinder to the tip of the cylinder, and is heated and melted by the heater at the tip, and the soldering target portion that enters the cylinder from the through-hole below the cylinder is soldered.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional soldering pipe, the pipe heated by the heater rises to a temperature at which the solder piece in the pipe melts in the vicinity of the lower end of the pipe, and not only in the vicinity of the lower end of the pipe but also the temperature of the middle part and the upper part of the pipe rises. Then, while the solder piece passes (falls) through the internal space surrounded by the inner wall surface (inner peripheral surface) of the pipe, it touches the inner wall surface of the upper part or the middle part of the pipe, and a part of the solder piece melts and adheres to the inner wall surface, narrowing the internal space and gradually making it difficult for the solder piece to fall. As a result, the timing at which the solder piece reaches the soldering target portion may become unstable, or the solder piece may not reach the soldering target portion.

[0005] This invention was created in view of these points, and its purpose is to provide a soldering pipe in which solder pieces are less likely to adhere to the inside of the pipe even if they come into contact with the inner wall surface of the pipe. [Means for solving the problem]

[0006] To achieve the above objective, the soldering pipe according to the present invention is A cylindrical first pipe having an inner diameter from which solder pieces can fall, A cylindrical second pipe having an inner diameter through which solder pieces can fall, and positioned below the first pipe, An insulating member having an insertion portion into which the lower end of the first pipe is inserted and a fitting portion into which the upper end of the second pipe is fitted, and the insertion portion and the fitting portion are connected to form a through hole, The invention comprises a heating means arranged around the second pipe for heating the second pipe, The lower end surface of the lower end of the first pipe is located near the upper end surface of the upper end of the second pipe. The outer circumferential surface of the lower end of the first pipe is not in contact with the inner circumferential surface of the insertion portion. The inner diameter of the lower end of the first pipe is less than or equal to the inner diameter of the upper end of the second pipe. It is characterized by the following:

[0007] "To insert" means "to fit in." For example, in order to "insert a pipe into a hole," the outer diameter of the pipe and the inner diameter of the hole must be approximately equal, and when "the pipe is inserted into the hole," the outer surface of the inserted pipe and the inner surface of the hole will be in contact without any gaps. Since the outer surface of the lower end of the first pipe is not in contact with the inner surface of the insertion part, heat is less likely to be transferred from the insulating material to the first pipe. Since the inner diameter of the lower end of the first pipe is less than or equal to the inner diameter of the upper end of the second pipe, solder pieces that fall through the first pipe can smoothly fall into the second pipe.

[0008] The first pipe is inserted into the third pipe, The inner diameter of the lower part of the insertion portion is, It is smaller than the inner diameter of the upper part of the insertion portion, and Smaller than the inner diameter of the aforementioned fitting portion, The lower end of the third pipe is fitted into the upper part of the insertion portion. The lower end surface of the first pipe is located below the lower end surface of the third pipe. It is preferable.

[0009] The inner diameter of the lower part of the insertion section is smaller than the inner diameter of the upper part of the insertion section, and also smaller than the inner diameter of the fitting section, which makes it easier for solder pieces to fall towards the center.

[0010] Preferably, the inner diameter of the upper end of the second pipe decreases as it progresses from the upper end surface toward the lower end surface. The inner diameter of the upper end decreases as it progresses from the upper end surface towards the lower end surface, allowing the solder pieces to fall smoothly. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a soldering pipe in which solder pieces falling inside the pipe do not come into contact with the inner surface of the pipe during their descent, and in which case no part of the solder pieces adhere to the inner surface of the pipe. [Brief explanation of the drawing]

[0012] [Figure 1] These are a front view and a cross-sectional view AA showing the schematic configuration of a soldering pipe according to an embodiment of the present invention. [Figure 2] Figure 1 shows cross-sectional views BB and CC of the glass cloth tube and guide pipe of the soldering pipe. [Figure 3] These are the front view, rear view, left side view, right side view, top view, bottom view, and cross-sectional view AA of the end cap 5. [Figure 4]Front transparent view, right side view, right side transparent view, plan view, bottom view, sectional view A-A, sectional view B-B, sectional view C-C, perspective view, and perspective transparent view of the stopper 3. [Figure 5] Six-sided views and perspective view of the cartridge pipe 4. [Figure 6] Front view, left side view, and plan view of the protection pipe 6. [Figure 7] Front view, left side view, plan view, and bottom view of the guide pipe 8. [Figure 8] Left side view, front view, enlarged plan view, bottom view, sectional view A-A, and enlarged upper end view (detailed view B) of the sleeve 7. [Figure 9] Front view, left side view, right side view, rear view, plan view, bottom view, sectional view A-A, sectional view B-B, and perspective view of the heater core 2. [Figure 10] Front view, right side view, rear view, plan view, bottom view, sectional view A-A, and perspective view of the heater cover 1. [Figure 11] Cross-sectional view showing multiple embodiments of the insertion part and the fitting part of the stopper 3.

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments of the soldering pipe of the soldering apparatus according to the present invention will be specifically described with reference to the drawings. However, the following embodiments do not limit the technical scope of the present invention.

[0014] FIG. 1 is a front view and a sectional view A-A showing the schematic configuration of a cartridge heater according to an embodiment of the present invention. As shown in FIG. 1, the soldering pipe of the soldering apparatus according to the present embodiment includes an end cap 5, a cartridge pipe 4, a protection pipe 6, a guide pipe 8 (first pipe), a stepped spacer 9, a glass cloth tube 13, a stopper 3 (heat insulating member), a first positioning pin 10, a second positioning pin 11, a sleeve 7 (first pipe), a heater core 2, a heater cover 1, and a ball stopper 12. Figure 1 shows a cross-sectional view AA of the cartridge heater, cut vertically to reveal its internal structure.

[0015] The solder piece falls through the internal space of the guide pipe 8. A protective pipe 6 is present around the guide pipe 8, with the outer surface of the guide pipe 8 and the inner surface of the protective pipe 6 facing each other. A cartridge pipe 4 is located around a protective pipe 6, with the outer surface of the protective pipe 6 and the inner surface of the cartridge pipe 4 facing each other. A glass cloth tube 13 is located between the outer surface of the protective pipe 6 and the inner surface of the cartridge pipe 4.

[0016] The guide pipe 8 is inserted into the through-hole of the stopper 3. The outer surface of the guide pipe 8 does not come into contact with the inner surface of the through-hole of the stopper 3. The lower end of the protective pipe 6 is fitted into the upper part of the through hole in the stopper 3. The protective pipe 6 does not penetrate the stopper 3.

[0017] A heater core 2 is located around the sleeve 7, and a heater cover 1 is located around the heater core 2. In order for the heater core 2 to efficiently heat the sleeve 7, the heater core 2 and the sleeve 7 are in contact. On the other hand, in order to prevent the heater cover 1 from being heated by the heater core 2 (that is, to prevent the heater cover 1 from taking heat away from the heater core 2), it is preferable to interpose a highly insulating material (such as a stepped spacer 9) between the heater cover 1 and the heater core 2, or to reduce the contact area between the heater cover 1 and the heater core 2.

[0018] The guide pipe 8 corresponds to a cylindrical first pipe having an inner diameter through which solder pieces can fall. Sleeve 7 corresponds to a cylindrical second pipe that has an inner diameter through which solder pieces can fall and is positioned below the first pipe (guide pipe 8). The stopper 3 corresponds to a heat insulating member having an insertion portion into which the lower end of the first pipe (guide pipe 8) is inserted, and a fitting portion into which the upper end of the second pipe (sleeve 7) is fitted.

[0019] The outer diameter of the lower end of the first pipe is smaller than the inner diameter of the insertion portion 31a (Figure 4), and a gap exists between the outer circumferential surface of the lower end of the first pipe and the inner circumferential surface of the insertion portion 31a. This is because heat is less likely to be transferred from the heat insulating member (stopper 3) to the first pipe (guide pipe 8) if the outer circumferential surface of the lower end of the first pipe is not in contact with the inner circumferential surface of the insertion portion 31a. To prevent the second pipe (sleeve 7) from rattling or falling off, it is preferable that the outer diameter of the upper end of the second pipe (sleeve 7) is approximately equal to the inner diameter of the fitting portion 31c (Figure 4).

[0020] Heating means for heating the second pipe are arranged around the second pipe. The lower end of the first pipe, when inserted into the insertion section, is positioned near the upper end of the second pipe, when fitted into the fitting section, but the lower end of the first pipe and the upper end of the second pipe are not in contact. The inner diameter ID1 (Figure 11) at the lower end of the first pipe is less than or equal to the inner diameter ID2 at the upper end of the second pipe.

[0021] Figure 2 shows cross-sectional views BB and CC of the cartridge heater cut vertically. As shown in the cross-sectional view BB of Figure 2, the two thermocouple wires 14 are each insulated from the protective pipe 6 and the cartridge pipe 4 by glass cloth tubes 13. Also, as shown in the cross-sectional view CC, the two heater wires 15 are each insulated from the protective pipe 6 and the cartridge pipe 4 by glass cloth tubes 13.

[0022] <End cap> Figure 3 shows the front view, rear view, left side view, right side view, top view, bottom view, and cross-sectional view AA of the end cap 5. For the material of the end cap 5, a resin with high insulating properties, such as phenolic resin, is preferred. The through-hole of the end cap 5 has a first through-hole that opens upward and a second through-hole that opens downward. The inner diameter of the first through-hole is narrower than the inner diameter of the second through-hole. As shown in Figure 3, the end cap has a first through hole 51 that penetrates the end cap vertically, as well as second to fifth through holes 52 to 55 that penetrate the end cap vertically. The protective pipe 6 and the guide pipe 8 pass through the first through hole 51. The thermocouple wire 14 passes through the second and third through holes 52 and 53. The heater wire 15 passes through the fourth and fifth through holes 54 and 55.

[0023] <Insulation material stopper> Figure 4 shows the front view, right side view, right side view, top view, bottom view, section AA, section BB, section CC, perspective view, and perspective view of the stopper 3. The thermal conductivity of the insulating material (stopper 3) is preferably 1.0 to 16.0 [W / m·K]. The material for the heat insulating component (stopper 3) is preferably a ceramic such as zirconia, or a metal with low thermal conductivity such as bismuth, nickel steel, chromium-nickel steel, or nickel-chromium alloy.

[0024] As shown in Figure 4, the heat insulating member (stopper 3) has through holes 31 and 33-39 that penetrate in the vertical direction, and a hole 32 on its upper surface. In this embodiment, the through hole 31 has an upper portion 31a, an intermediate portion 31b, and a lower portion 31c, as shown in the cross-sectional view AA of Figure 4. The upper portion 31a and the intermediate portion 31b are insertion portions into which the first pipe (guide pipe 8) is inserted. The lower part 31c is a fitting portion into which the second pipe (sleeve 7) is inserted.

[0025] As shown in the cross-sectional view CC of Figure 4, the relative sizes of the inner diameter ID3 of the upper part 31a, the inner diameter ID4 of the middle part 31b, and the inner diameter ID5 of the lower part are as follows. ID3>ID4 ID5>ID4 The cross-sectional view CC shown in Figure 4 will be explained again using Figure 11(c).

[0026] As shown in cross-sectional view AA, hole 32 has an opening on its upper surface, but does not penetrate the stopper in the vertical direction. Hole 32 is a through-hole for passing cooling air, but it is not a through-hole because of the stopper 42. Through holes 33-35 are through holes through which cooling air passes. The through holes 36 and 37 are through holes for passing the heater wires. The through holes 38 and 39 are through holes through which thermocouple wires are passed.

[0027] The horizontal hole 41 is an air vent for cooling. A positioning pin 10 is inserted into the lateral hole 42, and the sleeve 7 is fixed to the stopper 3. A positioning pin 11 is inserted into the lateral hole 43. The positioning pin 11 stops the rotation of the leaf spring. The leaf spring is used to hold in place the stopper that prevents the sleeve from falling out.

[0028] The outer diameter OD1 of the upper part 45 of the stopper 3 is approximately equal to the inner diameter ID41 of the lower end of the cartridge pipe 4, and the upper part 45 of the stopper 3 is fitted into the lower end of the cartridge pipe 4. The inner diameter ID6 of the lower end 47 of the stopper 3 is approximately equal to the outer diameter OD3 of the upper part of the heater cover 1, and the upper part of the heater cover 1 is fitted into the lower end 47 of the stopper 3.

[0029] <Cartridge pipe> Figure 5 shows the six-view and perspective views of the cartridge pipe 4. As shown in Figure 5, the cartridge pipe 4 is cylindrical and has first to third holes 46 to 48. For example, the outer diameter of the cartridge pipe 4 is 12 mm and its thickness is 0.5 mm. The first hole 46 is an inlet for taking in cooling air. The second hole 47 is a hole for the shaft used to secure the heater. The third hole 48 is an outlet for cooling air.

[0030] <Protective pipe> Figure 6 shows the front view, left side view, and top view of the protective pipe 6. The rear view is the same as the front view, the left side view is the same as the right side view, and the bottom view is the same as the top view, so they are omitted. As shown in Figure 6, the protective pipe is cylindrical and has multiple transverse holes 60 that penetrate from the outer surface to the inner surface. The horizontal hole 60 is a hole through which cooling air passes. As shown in Figure 1, the upper end of the protective pipe 6 is fitted into the through hole 51 of the end cap 5. The lower end of the protective pipe 6 is fitted into the upper part 31a of the through hole 31 of the stopper 3.

[0031] <Guide pipe> Figure 7 shows the front view, left side view, top view, and bottom view of the guide pipe 8. The rear view is the same as the front view, and the right side view is the same as the left side view, so they are omitted. 71 is the intake port for nitrogen gas (N2). 72 is the upper retainer for the spring. 73 is the lower retainer for the spring. 74 is the stopper for the upper spring retainer. 75 is a guide pipe for dropping solder pieces. As shown in Figure 1, the guide pipe 8 penetrates the end cap 5 and the protective pipe 6, and its lower end reaches the middle portion 31b of the stopper 3. However, the outer surface of the guide pipe 8 is spaced apart from the inner surface of the protective pipe 6 and the inner surface of the stopper 3.

[0032] <Sleeve> Figure 8 shows the left side view, front view, enlarged plan view, bottom view, section view AA, and an enlarged view of the upper end of section view AA (detailed view B) of sleeve 7. The rear view is the same as the front view, and the right side view is the same as the left side view, so they are omitted. The dashed lines in the left side view and front view indicate the inner circumferential surface. The sleeve 7 shown in Figure 8 is an example. The dimensions of each part in the example shown in the figure are as follows: Height H1: 38mm, Height H2: 1mm, Height H3: 8mm, Upper end inner diameter ID6: 2.97mm, lower end outer diameter OD4: 3.0mm, Lower end inner diameter ID8: 1.3 mm, projection 82 outer diameter OD5: 4.0 mm Angle θ of the opening at the top end: 15° Inner diameter of horizontal hole 81: 0.5 mm As shown in Figure 1, the upper end of the sleeve 7 is fitted into the fitting portion of the stopper 3.

[0033] <Heater core> Figure 9 shows the front view, rear view, left side view, right side view, top view, bottom view, section view AA, section view BB, and perspective view of the heater core 2. The heater core 2 shown in Figure 9 is an insulator with a through-hole for solder pieces in the center, a heater wound around the outside, and through-holes for passing a thermocouple and heater wire.

[0034] <Heater cover> Figure 10 shows the front view, rear view, right side view, top view, bottom view, cross-sectional view AA, and perspective view of the heater cover 1. The left side view is the same as the right side view and is therefore omitted. The upper part of the heater cover 1 is fitted into the lower end 47 of the stopper 3.

[0035] <End cap 5, guide pipe 8, protective pipe 6, and cartridge pipe 4> The end cap 5 is fitted into the opening at the top of the cartridge pipe 4. A protrusion 49 formed on the inner surface of the cartridge pipe 4 is fitted into a groove 56 formed on the outer surface of the end cap 5.

[0036] The guide pipe 8 passes through the through-hole of the end cap 5. The outer surface of the guide pipe 8 does not contact the inner surface of the through-hole of the end cap 5. The protective pipe 6 is fitted from below into the second through-hole of the end cap 5. The protective pipe 6 does not penetrate the end cap 5.

[0037] <Stopper 3, guide pipe 8, protective pipe 6 and cartridge pipe 4, sleeve 7, heater core 2 and heater cover 1> The stopper 3 is fitted into the lower opening of the cartridge pipe 4.

[0038] Figure 11(a) shows an example of an embodiment in which the protective pipe 6 is not used. As shown in Figure 11(a), The heat insulating member (stopper 3) has an insertion portion into which the lower end of the first pipe (guide pipe 8) is inserted, and a fitting portion into which the upper end of the second pipe (sleeve 7) is fitted. The insertion portion and the fitting portion are connected to form a through hole 31. The lower end surface of the lower end of the first pipe (guide pipe 8) is positioned near the upper end surface of the upper end of the second pipe (sleeve 7). The outer circumferential surface of the lower end of the first pipe (guide pipe 8) is not in contact with the inner circumferential surface of the insertion portion of the heat insulating member (stopper 3). The inner diameter (ID1) of the lower end of the first pipe (guide pipe 8) is less than or equal to the inner diameter (ID2) of the upper end of the second pipe (sleeve 7).

[0039] Figure 11(b) shows another example of an embodiment of the present disclosure. As shown in Figure 11(b), The first pipe (guide pipe 8) is inserted into the third pipe (protective pipe 6), The inner diameter (ID4) of the lower part of the insertion section is, It is smaller than the inner diameter (ID3) of the upper part of the insertion section, and Smaller than the inner diameter of the insertion part (ID5), The lower end of the third pipe (protective pipe 6) is fitted into the upper part of the insertion section. Preferably, the height position (HP1) of the lower end surface of the first pipe (guide pipe 8) is lower than the height position (HP2) of the lower end surface of the third pipe (protective pipe 6).

[0040] The outer surface of the guide pipe 8 is not in contact with the inner surface of the protective pipe 6 or the inner surface of the stopper 3.

[0041] Figure 11(c) shows another example of an embodiment of the present disclosure. It is preferable that the inner diameter of the second pipe (sleeve 7) decreases as it moves from the upper end surface toward the lower end surface. For example, as shown in Figure 11(c), it is preferable that the inner diameter (ID7) at a position closer to the lower end surface (HP4) is smaller than the inner diameter (ID6) at the upper end surface (HP3). By adopting this shape, the gap between the inner surface of the upper end of the second pipe (sleeve 7) and the outer surface of the first pipe (guide pipe 8) becomes larger, making it more difficult for heat to be transferred from the upper end of the second pipe (sleeve 7) to the lower end of the first pipe (guide pipe 8). [Explanation of Symbols]

[0042] 1 Heater cover 2 Heater core 3 Stopper 4 cartridge pipes 5 End caps 6. Protective pipe 7 sleeves 8 Guide pipes 9-tier spacer 10 First positioning pin 11. Second positioning pin 12 Ball Stoppers 13 Glass cloth tube 14 Thermocouple wire 15 Heater wire

Claims

1. A cylindrical first pipe having an inner diameter from which solder pieces can fall, A cylindrical second pipe having an inner diameter through which solder pieces can fall, and positioned below the first pipe, An insulating member having an insertion portion into which the lower end of the first pipe is inserted and a fitting portion into which the upper end of the second pipe is fitted, and the insertion portion and the fitting portion are connected to form a through hole, The invention comprises a heating means arranged around the second pipe for heating the second pipe, The lower end surface of the lower end of the first pipe is located near the upper end surface of the upper end of the second pipe. The outer circumferential surface of the lower end of the first pipe is not in contact with the inner circumferential surface of the insertion portion. The inner diameter of the lower end of the first pipe is less than or equal to the inner diameter of the upper end of the second pipe. A soldering pipe characterized by the following features.

2. The first pipe is inserted into the third pipe, The inner diameter of the lower part of the insertion portion is, It is smaller than the inner diameter of the upper part of the insertion portion, and Smaller than the inner diameter of the aforementioned fitting portion, The lower end of the third pipe is fitted into the upper part of the insertion portion. The soldering pipe according to claim 1, wherein the lower end surface of the first pipe is located below the lower end surface of the third pipe.

3. The soldering pipe according to claim 1 or 2, wherein the second pipe has an inner diameter at the upper end that decreases as it progresses from the upper end surface toward the lower end surface.

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