JPS63177958A - Vertically moving device for guide rail for conveying printed circuit board - Google Patents

Abstract

PURPOSE:To prevent a heat transfer liquid from being discharged to the outside of a soldering device by lowering and rising guide rails of a heating liquid tank part by means of a vertical moving device. CONSTITUTION:A hydraulic cylinder operates and a movable base 63 descends when a printed circuit board 1 comes to movable rails 70. The rails 70 are, therefore, lowered as well respectively by means of supporting bars. The printed circuit board 1 is preheated in the part upper than the boundary face 6b of the vapor 6a layer of the heat transfer liquid 6. The preheated printed circuit board descends further to enter the vapor 6a layer where the circuit board is heated and soldered. The soldered printed circuit board 1 is returned to the home position as a movable base 63 is raised by the operation of the hydraulic cylinder and the rails 70 are raised as well. The vapor of the heat transfer liquid is thereby stagnated in the heating liquid tank 8 and the discharge of the vapor of the heat transfer liquid to the outside is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention engages a printed circuit board with an engagement groove of a guide rail and transports it sequentially and intermittently, and also lowers and raises the printed circuit board to perform soldering. This invention relates to a device for vertically moving a guide rail for carrying printed circuit boards.

[Conventional technology]

FIG. 10 is a side sectional view showing an example of a conventional vapor phase soldering device, in which 1 is a printed circuit board, 2 is a chip component, 3 is a solder paste applied in advance to the printed circuit board 1, and 4 is a vapor phase soldering device. In the apparatus, 5 is a storage tank, and 6 is a heat transfer liquid, for example, Fluorinert (trade name of Sumitomo 3M Co., Ltd.), which is a fluorine-based inert liquid, is used.

6a is the vapor of the heat transfer liquid 6, which has a temperature higher than the melting point of the solder paste 3. 7 is a heater, 8 is a heating liquid tank, 9 is a loading port for the printed circuit board 1, 10 is a loading passage serving as a transport path for the printed circuit board 1, 10a is an inclined surface of the loading passage 10, and 11 is a loading port. , 12 is a discharge side passage which also serves as a transport path, 12a is an inclined surface of the discharge side passage 12, 13 is a cooler, 14 is a cover for collecting the steam 6a discharged from the carry-in port 9 and the carry-out port 11, 15
is a conveyance chain as a means for conveying the printed circuit board 1. As shown in FIG. Moreover, a belt conveyor may be used instead of the conveyance chain 15.

16 is a sprocket of the conveyor chain 15, and in the case of a belt conveyor, rollers are used.

Since the conventional vapor phase soldering apparatus 4 is configured as described above, the printed circuit board 1 is engaged with the holding claws (not shown) of the conveyor chain 15 or placed on a belt conveyor and conveyed. , a heat transfer liquid 6 heated by a heater 7
After the solder paste 3 was melted by the steam 6a and soldering was performed, the molten solder solidified and the chip component 2 was fixed to the printed circuit board 1 and carried out.

Further, the steam 6a was cooled by the cooler 13 and recovered as a liquid.

[Problem that the invention seeks to solve]

By the way, in the conventional vapor phase soldering device 4, the steam 6
a is cooled and becomes a liquid heat transfer liquid 6, which adheres to a conveying chain (or belt conveyor) 15. Therefore, as the conveyor chain 15 runs, the heat transfer liquid 6 is discharged from the discharge port 11 to the outside of the vapor phase soldering apparatus 4, making it impossible to recover it. Therefore, there is a problem in that the expensive heat transfer liquid 6 is consumed a lot, which is uneconomical and increases the product cost.

This invention was made in order to solve the above-mentioned problems, and includes a guide rail that engages and transports the printed circuit board in the transport path, and also allows the vapor of the heat transfer liquid to stay in the storage tank. The object of the present invention is to provide a vertical movement device for a guide rail for carrying a printed circuit board, which lowers and raises a guide rail in a heating liquid tank portion in order to prevent heat transfer liquid from being discharged to the outside of a soldering device.

[Means for solving problems]

The device for vertically moving a guide rail for conveying a printed circuit board according to the present invention includes a guide rail provided with an engagement groove for engaging a printed circuit board along a conveyance path of the printed circuit board, and a heated liquid tank in the middle of the guide rail. A movable rail provided in the upper part, a drive device that moves this movable rail up and down,
A long shaft provided parallel to the guide rail, a plurality of engagement pieces fixed in series at predetermined intervals in the longitudinal direction of the shaft to transport the printed circuit board, and a plurality of engagement pieces fixed at predetermined intervals in the longitudinal direction of the shaft, a driving means that reciprocates the printed circuit board by a predetermined angle in the circumferential direction about the axis of the shaft body and rotates it forward and backward by a predetermined angle, thereby causing the printed circuit board to engage and disengage from the engagement piece, thereby sequentially and intermittently conveying the printed circuit board; It is equipped with the following.

[Effect]

In this invention, when the printed circuit board that is engaged with the engagement groove of the guide rail and is conveyed reaches the movable rail at the top of the heating liquid tank, the movable rail descends and remains in the heating liquid tank. immersed in the vapor of a heat transfer liquid. Also,
The vapor of the heat transfer liquid in the heating liquid tank and the heat transfer liquid adhering to the engagement groove of the guide rail are almost never discharged to the outside and are returned to the heating liquid tank and collected.

(Embodiment) FIG. 1 is a side cross-sectional view schematically showing an embodiment of the present invention, FIG. 2 is a plan view showing an enlarged portion of the printed circuit board conveying device in FIG. 1, and FIG. FIG. 4 is a side sectional view taken along line I-I in FIG. 2, FIG. 4 is a view seen from the printed circuit board exit side in FIG. 2, and FIG. 5 is a side view showing a further enlarged part of the printed circuit board delivery device. , FIG. 6 is a sectional view taken along the line II--II in FIG. 5, FIG. 7 is a side view showing details of the guide rail, and FIG. 8 is a perspective view showing the vertical movement device for the guide rail for conveying printed circuit boards of the present invention. 9 are explanatory diagrams showing the operation of FIG. 8.

In these figures, the same reference numerals as in FIG. 10 indicate the same parts, 1a indicates the front end of the printed circuit board 1 in the transport direction (direction of arrow A), and 1b indicates the rear end. 21 shows the entire vapor phase soldering device.

22 is a guide rail on the fixed side and a movable side for transporting the printed circuit board 1; 23 is an engagement groove for engaging the printed circuit board 1; and 24 is a guide rail for smoothly placing the printed circuit board 1 in the engagement groove 23. 25 is a fixed base on which the fixed side guide rail 22 is attached, 26 is a movable bearing on which the movable side guide rail 22 is attached, and 27 is a setting for the holding width of the printed circuit board 1. Movable bearing 2
6 is screwed into a rotatable screw rod; 28 is the fixed base 25;
a fixed shaft fixedly fixed to the movable bearing 26 and slidably fitted to the movable bearing 26;
29 is a handle for rotating the screw rod 27; 30 is a sprocket fixed to the screw rod 27; 31 is a printed circuit board feeding device for intermittently feeding the printed circuit board 1 engaged with the guide rail 22; Figure, 6th
The details are shown in the figure. 32 is a pedestal of the printed circuit board delivery device 31; 33 is a screw rod for moving the pedestal 32 in a direction perpendicular to the conveying direction (six directions of arrows) of the printed circuit board 1 according to the holding width of the printed circuit board 1; 34. 35 is a sprocket fixed to the threaded rod 33; 36 is a roller chain connecting each sprocket 30° 34; 37
38 is a board of the printed circuit board delivery device 31; 38 is a connecting plate that connects and fixes the base 32 and the board 37; 39;
is an elongated shaft body, and its axial direction is provided parallel to the guide rail 22 and the conveyance direction (direction of arrow A) of the printed circuit board 1. 4o is a cylinder provided on the outer periphery of the shaft body 39, the details of which are shown in FIG. The shaft body 39 is the sixth
As shown in the figure, the ridgeline of the shaft body 39 does not come into contact with the inner circumference of the cylinder 4o. 41 is a flange formed at both ends of the cylinder 40, and 42 is a notch formed in the longitudinal direction of the cylinder 40, which allows an engagement piece 46 (described later) to pass through by movement of the shaft body 39. 43 is a bearing fixed to the flange 41 of the cylinder 40; 44 is a wheel provided on the bearing 43 and runs on the shaft body 39; 45 is a wheel attached to the pedestal 32 and runs on the outer periphery of the cylinder 40. A plurality of engaging pieces 46 are attached to the shaft body 39 in series at a predetermined interval (pitch P), and when engaged, push the rear end portion 1b of the printed circuit board 1 and transport it. 47 is a connecting plate attached to the end of the shaft body 39, 48 is a bearing fixed to the connecting plate 47, and 49 is a shaft that is fitted into the bearing 48 and freely slides in the axial direction. . And the connecting plate 47
．． The bearing 48° shaft 49 forms a connecting means for connecting the shaft body 39 and the substrate 37. 50 is a bearing rotatably attached to one end of the shaft 49, 51 is a roller chain,
The bearing 50 is now installed. 52 is a sprocket, 5
2A is the driving sprocket, 52B, 52c, 52D
is a driven sprocket. 53 is a motor attached to the substrate 37 and serves as a driving means for driving the roller chain 51; 54 is a truck; 55 is a wheel of the truck 54; 56 is a guide rail on which the truck 54 runs; 57
5 is a connecting rod that connects the board 37 and the trolley 54, and 5 is a roller chain.

Reference numeral 61 denotes a vertical movement device for a printed circuit board conveying guide rail that moves the printed circuit board 1 engaged with the guide rail 22 up and down, 62 a fixed base, 63 a movable base, 64 a guide shaft of the movable base 63, and 65 66 is a rod of the hydraulic cylinder 65, 67 is a support rod fixed to the movable table 63, and 68 is the direction of conveyance of the printed circuit board 1 ( A support rod movable in a direction perpendicular to the direction of arrow A); 69 is a guide hole into which the support rod 68 is slidably suspended; 7o is provided in the upper part of the heated liquid tank 8; These are movable rails that move and are supported by support rods 67 and 68, respectively. 71 is an engaging portion of the movable rail 70;
72 is a guide plate for each of the support rods 67 and 68; 73 is a movable bearing into which the support rod 68 is slidably fitted;
It is possible to move in the direction perpendicular to the direction. 74 is a fixed bearing; 75 is a screw rod for moving the movable bearing 73; 76
77 is the guide shaft of the movable bearing 73, and the movable rail 7.
A guide shaft 78 is a guide plate attached to the movable rail 70, and is slidably fitted to the guide shaft 77. 79 is a sprocket of the screw rod 27, 80 is a sprocket of the screw rod 75, and 81 is a roller chain.

In the printed circuit board feeding device configured as above,
First, turn the handle 29 to rotate the screw rod 27, move the movable bearing 26, and move the guide rail 22 to the printed circuit board 1.
Retain fluently. Also, since the sprocket 30 of the threaded rod 27 also rotates, the roller chain 36. The screw rod 33 rotates via the sprocket 34, and the pedestal 32 and the board 3
7 moves B at the same time as the movable bearing 26.

Further, rotation of the sprocket 35 causes the movable bearings 26 (in FIG. 1, 4
) and sprocket 79.80 as shown in Figure 8.
．． The movable bearing 73 also moves at the same time via the roller chain 81.

Next, when the bearing 50 is in the position of the driving sprocket 52A as shown in FIG. 3, when the motor 53 is driven and the roller chain 51 runs clockwise, the bearing 50
runs in the direction of arrow A. And sprocket 52B
When the motor 53 is stopped at
It travels in the direction of arrow A by pitch P.

At this time, the tip end 1a of the printed circuit board 1 is inserted into the engagement groove 23 of the guide rail 22 on the side of the loading port 9 and abuts against the engaging piece 46 on the side of the loading port 9. Next, when the motor 53 is driven again and the roller chain 51 is run clockwise, the bearing 5Q is lowered from the sprocket 52B position to the sprocket 52C position. At this time, as shown in FIG. 4, the engaging piece 46. Connecting plate 47. Bearing 48. The shaft 49 rotates clockwise around the shaft body 39 and the bearing 48 slides on the shaft 49, and the position shown by the solid line becomes the position shown by the two-dot chain line, and the engaging piece 46 engages the printed circuit board 1. move away from the matching position. Next, as the chain 51 moves further, the bearing 50 moves in the direction opposite to the arrow A direction as shown in FIG. Rear end 1b
position. Next, the bearing 50 is attached to the sprocket 52D.
When the engaging piece 46 rises from the position , and reaches the sprocket 52A position, the engaging piece 46 rotates counterclockwise as shown in FIG. 4, so that it engages with the rear end 1b of the printed circuit board 1. Next, as the bearing 50 moves from the sprocket 52A in the direction of arrow A in the same manner as described above, the engagement piece 46 pushes the rear end portion 1b of the printed circuit board 1 and transports the printed circuit board 1 in the direction of the arrow. By repeating the above operations, the printed circuit boards 1 are sequentially inserted and transported intermittently at pitches P.

In addition, in this invention, since the heating liquid tank 8 is deeper than the conventional one, when the heat transfer liquid 6 is heated by the heater 7 and vaporized, a layer of high temperature steam 6a is formed and the heating liquid tank 8 It stays in the lower part of the body. Therefore, the portion above the boundary surface 6b of the steam 6a becomes diluted steam 6C, which stays above the heating liquid tank 8 and in each passage 10.12, and the steam 6a
A lower temperature atmosphere is formed than that of the layer.

Next, when the printed circuit board 1 comes to the movable rail 70 as shown in FIGS. 8 and 9, the hydraulic cylinder 65 is activated and the movable base 63 is lowered via the rod 66. Therefore, the movable rails 70 are also lowered as shown in FIG. 9 via the support rods 67 and 68, respectively. Then, the printed circuit board 1 is preheated in a portion above the boundary surface 6b of the layer of vapor 6a of the heat transfer liquid 6, and further descends into the layer of vapor 6a to be heated and soldered. The soldered printed circuit board 1 is moved to the movable table 63 by the operation of the hydraulic cylinder 650.
As the movable rail 70 rises, the movable rail 70 also rises and returns to its original position.

Then, the engagement piece 46 is moved again to the rear end 1b of the printed circuit board 1.
Press to transport in the direction of arrow A. Then, intermittent conveyance is repeated sequentially by pitch P, and the sheet is taken out from the outlet 11.

Note that soldering by lowering and raising the movable rail 70 is performed while the engaging piece 46 is released from the printed circuit board 1 and returns together with the shaft body 39 in the direction opposite to the arrow A direction, that is, the third
As shown in the figure, a bearing 50 attached to a roller chain 51 of a printed circuit board feeding device 31 is attached to a sprocket 52.
This is done while moving from B to 52A via 52C and 52D.

Next, the printed circuit board 1 that has been soldered is taken out from the outlet 11.

In addition, the steam 6a staying in each conveyance path 10.12 enters the engagement groove 23 and is cooled and liquefied, but the printed circuit board 1 runs on the wheels 24 of the guide rail 22 and the wheels 24
As shown in FIG. 7, the heat transfer liquid 6 that has become a liquid in the engagement groove 23 passes through the gap 22a between the guide rail 22 and the wheel 24 and enters the discharge side passage 1 as shown by arrow B.
The liquid is drained by dropping it into the container. Next, heat transfer liquid 6
The liquid flows on the inclined surface 12a of the discharge side passage 12, enters the heated liquid tank 8, and is collected.

(Effects of the Invention) As explained above, the present invention provides a guide rail provided with an engagement groove for engaging a printed circuit board along a conveyance path of the printed circuit board, and an upper part of a heated liquid tank in the middle of the guide rail. A movable rail provided on the section, a drive device that moves the movable rail up and down, a long shaft provided parallel to the guide rail, and a plurality of shafts fixed in series at predetermined intervals in the longitudinal direction. The engagement piece, which allows the printed circuit board to be conveyed by the shaft, is reciprocated in the longitudinal direction by a predetermined interval, and the shaft is rotated forward and backward by a predetermined angle in the circumferential direction around the axis of the shaft. Since it is equipped with a drive means that engages and disengages the printed circuit board from the mating piece and sequentially and intermittently transports the printed circuit board,
The heat transfer liquid adhering to the engagement groove of the guide rail can be recovered without being discharged to the outside. In addition, it became possible to lower the printed circuit board at the heating liquid tank.
Since the vapor of the heat transfer liquid can be retained inside the heating liquid tank, it is extremely rare that the vapor of the heat transfer liquid is discharged to the outside, and there is almost no need to replenish the heat transfer liquid, making it economical. . In addition, since the printed circuit board is lowered and raised above the heated liquid tank and soldered while the intermittent conveyance of the printed circuit board is stopped, productivity does not decrease and product costs are reduced. It has the advantage of being able to be lowered.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a plan view showing an enlarged main part of FIG. 1, and FIG.
The figure is a side sectional view taken along line I-I in Figure 2, Figure 4 is a view seen from the printed circuit board exit side in Figure 2, and Figure 5 is a further enlarged view of a part of the printed circuit board delivery device. Side view,
FIG. 6 is a sectional view taken along the line II-II in FIG. 5, FIG. 7 is a side view showing details of the guide rail, and FIG. 8 is a perspective view showing a vertical movement device for a guide rail for conveying printed circuit boards according to the present invention. , FIG. 9 is an explanatory view showing the operation of FIG. 8, and FIG. 10 is a side sectional view showing an example of a conventional steam tank soldering apparatus. In the figure, 1 is a printed circuit board, 2 is a chip component, 3 is a solder paste, 6 is a heat transfer liquid, 7 is a heater, 8 is a heating liquid tank,
10 is a carry-in side passage, 12 is a carry-out side passage, 13 is a cooler,
21 is a vapor phase soldering device, 22 is a guide rail, 2
3 is an engagement groove, 24 is a wheel, 31 is a printed circuit board feeding device, 32 is a pedestal, 37 is a board, 38 is a connecting plate, 39 is a shaft body, 40 is a cylinder, 42 is a notch, 46 is an engagement piece, 47
is a connecting plate, 48 is a bearing, 49 is a shaft, 50 is a bearing, 51 is a roller chain, 52A, 52B, 52C, 52D are sprockets, 53 is a motor, 61 is a vertical movement device, 63 is a movable base, 65 is a hydraulic cylinder , 66 is a rod, 67.6
8 is a support rod, 70 is a movable rail, 71 is an engaging portion, 77 is a guide shaft, and 78 is a guide plate.

Claims (1)

[Claims] a heating liquid tank that stores a heat transfer liquid having a boiling point higher than the melting point of the solder paste applied to the printed circuit board in advance, and melts the solder paste of the printed circuit board with the steam generated by heating the heat transfer liquid; A steam tank soldering device comprising an input side passage and an output side passage connected to the heating liquid tank and serving as a conveyance path for the printed circuit board, and a cooler provided above the heating liquid tank and cooling the steam, a guide rail provided with an engagement groove for engaging the printed circuit board along the conveyance path of the printed circuit board;
A movable rail provided in the upper part of the heated liquid tank in the middle of the guide rail, a drive device that moves this movable rail up and down, a long shaft provided parallel to the guide rail, and this shaft. A plurality of engaging pieces are fixed in series at predetermined intervals in the longitudinal direction of the body to transport the printed circuit board, and the shaft body is reciprocated at a predetermined interval in the longitudinal direction, and the shaft body is centered on the axis of the shaft body. and a driving means for sequentially and intermittently transporting the printed circuit board by engaging and disengaging the printed circuit board from the engaging piece by rotating the printed circuit board forward and backward by a predetermined angle in the circumferential direction. Vertical movement device for guide rails.