JPH059190B2 - - Google Patents

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. The present invention relates to a printed circuit board transfer device equipped with a guide rail vertical movement device.

[Conventional technology]

FIG. 10 is a side sectional view showing an example of a conventional vapor phase soldering apparatus, 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, of which Fluorinert (trade name of Sumitomo 3M Ltd.), which is a fluorine-based inert liquid, is used as an example.
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 serving as means for conveying the printed circuit board 1. As shown in FIG. Furthermore, the conveyor chain 15 may be replaced by a belt conveyor. 1
6 is a sprocket of the conveyance chain 15, and in the case of a belt conveyor, a roller is 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. , heater 7
After the solder paste 3 is melted by the vapor 6a of the heat transfer liquid 6 heated by the heat transfer liquid 6 and soldering is performed, the melted solder solidifies and the chip part 2 is 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 vapor 6a is cooled to become a liquid heat transfer liquid 6 and then transferred to the conveyor chain (or belt conveyor) 15.
Attach to. For this reason, as the conveyance 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, the expensive heat transfer liquid 6 is often consumed.
There was a problem that the product cost increased because it was uneconomical.

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. An object of the present invention is to obtain a printed circuit board transfer device equipped with a guide rail vertical movement device that 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. do.

[Means for solving problems]

A printed circuit board transfer device equipped with a guide rail vertical movement device according to the present invention includes a guide rail provided with an engagement groove for engaging a printed circuit board along a printed circuit board transfer path, and a heating section in the middle of the guide rail. A movable rail, which is a guide rail, on which a printed circuit board is placed in the upper part of the liquid tank and moves up and down, and a drive device that moves the movable rail up and down to insert and remove the printed circuit board into the heated liquid tank. , a long shaft provided parallel to the guide rail, a plurality of engagement pieces fixed at predetermined intervals in the longitudinal direction of this shaft to engage and disengage from the printed circuit board, and a shaft that extends longitudinally when the movable rail is raised. The engagement piece is reciprocated at a predetermined interval in the direction of the shaft, and rotated forward and backward by a predetermined angle in the circumferential direction around the axis of the shaft body, thereby causing the engagement piece to engage and disengage from the printed circuit board, thereby sequentially intermittent the printed circuit board. The present invention is equipped with a guide rail vertical movement device characterized by comprising a drive means for conveying the guide rail.

[Effect]

In this invention, when the printed circuit board being conveyed by engaging the guide rail with the engagement groove comes to the movable rail at the top of the heating liquid tank, the movable rail descends and stays in the heating liquid tank. immersed in the vapor of a heat transfer liquid. In addition, the heat transfer liquid hardly adheres to the steam of the heat transfer liquid in the heating liquid tank or to the engagement groove of the guide rail and is discharged to the outside, but returns to the heating liquid tank and is recovered.

〔Example〕

FIG. 1 is a side 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. 4 is a side sectional view taken along the - line, FIG. 4 is a view seen from the printed circuit board unloading port side in FIG. 2, FIG. 5 is a sectional view taken along the - line, and FIG. 7 is a side view showing details of the guide rail.
FIG. 8 is a perspective view showing a vertical movement device for a printed circuit board conveying guide rail according to the present invention, and FIG. 9 is an explanatory view 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 a fixed side and a movable side for transporting the printed circuit board 1; 23 is a guide rail for the printed circuit board 1;
24 is a wheel provided to place the printed circuit board 1 in the engagement groove 23 and transport it smoothly; 25 is a wheel provided on the fixed side guide rail 2;
2 is a fixed base on which the guide rail 22 on the movable side is mounted; 27 is a movable bearing 26 for setting the holding width of the printed circuit board 1;
28 is a fixed shaft fixed to the fixed base 25 and slidably fitted to the movable bearing 26; 29 is a handle for rotating the screw rod 27; 30 is the screw rod; A sprocket 27 is fixed to the sprocket, and 31 is a printed circuit board feeding device for intermittently feeding out the printed circuit board 1 engaged with the guide rail 22, the details of which are shown in FIGS. 5 and 6. 32 is a pedestal of the printed circuit board feeding device 31; 33 is a screw rod for moving the pedestal 32 in a direction perpendicular to the conveyance direction (arrow A direction) of the printed circuit board 1 according to the holding width of the printed circuit board 1;
34 and 35 are sprockets fixed to the threaded rod 33; 36 is a roller chain that connects the sprockets 30 and 34; 37 is a board of the printed circuit board feeding device 31; and 38 is the pedestal 32.
A connecting plate 39 connects and fixes the board 37 and the board 37, and the connecting plate 39 is an elongated shaft whose axial direction is aligned with the guide rail 2.
2 and the printed circuit board 1 in parallel to the transport direction (direction of arrow A). 40 is the shaft body 3
9, the details of which are shown in FIG. As shown in FIG. 6, the shaft 39 is designed so that the ridgeline of the shaft 39 does not come into contact with the inner circumference of the cylinder 40. 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 the cylinder 4
A bearing 44 is fixed to the flange 41 of 0, a wheel 44 is provided on the bearing 43 and runs on the shaft body 39, 45 is attached to the pedestal 32, and the cylindrical 4
The wheel running on the outer circumference of 0, the engagement piece 46 is the shaft body 3
9 are attached in series at predetermined intervals (pitch P), and when engaged, the rear end portion 1b of the printed circuit board 1 is pushed and conveyed. 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 fitted to the bearing 48 and sliding freely in the axial direction. be.
The connecting plate 47, the bearing 48, and the shaft 49 form 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;
is installed. 52 is a sprocket, 52
A is the drive sprocket, 52B, 52C, 5
2D 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 cart;
55 is a wheel of the truck 54; 56 is the wheel of the truck 54;
57 is a connecting rod connecting the board 37 and the carriage 54, and 58 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 conveyance direction of the printed circuit board 1 (indicated by the arrow). 69 is a guide hole in which the support rod 68 is slidably suspended and fitted; 70 is provided in the upper part of the heating liquid tank 8 and is movable in a vertical direction; It is also a guide rail having an engagement groove 23 for mounting the printed circuit board 1, and is supported by support rods 67 and 68, respectively. 71 is an engaging portion of the movable rail 70; 72 is a guide plate of each of the support rods 67, 68;
Reference numeral 73 denotes a movable bearing into which the support rod 68 is slidably fitted, and is movable in a direction perpendicular to the direction of arrow A. 74 is a fixed bearing, 75 is a screw rod for moving the movable bearing 73, 76 is a guide shaft of the movable bearing 73, 77 is a guide shaft of the movable rail 70, and 78 is a guide plate attached to the movable rail 70. , are slidably fitted to the guide shaft 77. 79 is a sprocket of the screw rod 27;
80 is a sprocket of the threaded rod 75, and 81 is a roller chain.

In the printed circuit board feeding device 31 configured as described above, first, the handle 29 is turned to rotate the screw rod 27 and the movable bearing 26 is moved to adjust the guide rail 22 to the holding width of the printed circuit board 1. Also, since the sprocket 30 of the threaded rod 27 also rotates, the roller chain 36 and the sprocket 3
4, the screw rod 33 rotates, and the base 32 and the base plate 37 move simultaneously with the movable bearing 26.

Further, due to the rotation of the sprocket 35, the loading side passage 1 shown in FIG. 1 is opened via the roller chain 58.
As shown in FIG. 8, the movable bearings 26 (four in FIG. 1) provided in the 0 and discharge side passages 12, the sprockets 79, 80, and the roller chain 8
1, the movable bearing 73 also moves at the same time.

Next, when the bearing 50 is in the position of the driving sprocket 52A as shown in FIG.
3 and causes the roller chain 51 to travel clockwise, the bearing 50 travels in the direction of arrow A.
Then, connect motor 5 at sprocket 52B.
3 is stopped, the engaging piece 46 moves by one pitch P in the direction of arrow A.

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, the motor 53 is driven again, and the roller chain 5
1 is run clockwise, the bearing 50 descends from the sprocket 52B position, and the bearing 50 moves down from the sprocket 52B position.
It will be in position C. At this time, as shown in FIG. 4, the engaging piece 46, the connecting plate 47, the bearing 48, and the shaft 49 rotate clockwise around the shaft body 39, with the bearing 48 sliding on the shaft 49, and the solid line The engagement piece 46 moves away from the position where it engages the printed circuit board 1 from the position indicated by the two-dot chain line. Then,
As the roller chain 51 continues to travel, the bearing 50 moves in the direction opposite to the arrow A direction as shown in FIG.
position. Next, when the bearing 50 rises from the sprocket 52D position and reaches the sprocket 52A position, the engagement piece 46 rotates counterclockwise as shown in FIG. engage. Next, as the bearing 50 moves from the sprocket 52A in the direction of arrow A in the same manner as described above, the engaging 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 arrow A. By repeating the above operations, the printed circuit boards 1 are sequentially inserted and conveyed intermittently in pitches P by pitch P.

Further, in this invention, since the heated liquid tank 8 is deeper than the conventional one, when the heat transfer liquid 6 is heated and vaporized by the heater 7, a layer of high temperature steam 6a is formed, and the heated liquid It stays in the lower part of the tank 8. Therefore, the portion of the steam 6a above the boundary surface 6b becomes diluted steam 6c and stays above the heating liquid tank 8 and in each of the passages 10 and 12, forming an atmosphere that is lower temperature than the layer of the steam 6a.

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 rail 70 also descends 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. Since the movable base 63 of the soldered printed circuit board 1 is raised by the operation of the hydraulic cylinder 65, the movable rail 70 is also raised and returns to its original position.

Then, the engaging piece 46 pushes the rear end portion 1b of the printed circuit board 1 again and transports it in the direction of arrow A. Then, each pitch P is sequentially and repeatedly transported intermittently and 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, as shown in FIG. The bearing 50 attached to the roller chain 51 of the feeding device 31 is connected to the sprockets 52B to 52.
This is done while moving to 52A via C and 52D.

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

Further, the steam 6a staying in each of the conveyance paths 10 and 12 enters the engagement groove 23 and is cooled and liquefied, but the printed circuit board 1 is removed from the wheels of the guide rail 22.
4 and the wheels 24 rotate, the heat transfer liquid 6 that has become a liquid in the engagement groove 23 flows into the gap 22 between the guide rail 22 and the wheel 24, as shown in FIG.
The liquid is drained by dripping into the discharge side passage 12 as shown by arrow B through a. Next, the heat transfer liquid 6 flows on the inclined surface 12a of the discharge side passage 12, enters the heated liquid tank 8, and is recovered.

〔Effect of the invention〕

As explained above, the present invention includes a guide rail provided with an engagement groove for engaging a printed circuit board along the conveyance path of the printed circuit board, and a printed circuit board provided in the upper part of the heated liquid tank in the middle of the guide rail. A movable rail that is a guide rail on which a board is placed and moves up and down; a drive device that moves the movable rail up and down and inserts and removes the printed circuit board into the heated liquid tank;
A long shaft provided parallel to the guide rail, a plurality of engagement pieces fixed at predetermined intervals in the longitudinal direction of this shaft to engage and disengage from the printed circuit board, and a shaft that moves the shaft in the longitudinal direction when the movable rail is raised. By reciprocating at a predetermined interval and rotating forward and backward by a predetermined angle in the circumferential direction around the axis of the shaft body, the engaging piece is engaged with and disengaged from the printed circuit board, and the printed circuit board is sequentially and intermittently conveyed. Since the guide rail vertical movement device is provided, the heat transfer liquid adhering to the engagement groove of the guide rail can be collected without being discharged to the outside. In addition, since it is now possible to lower the printed circuit board at the heating liquid tank, the vapor of the heat transfer liquid can be retained inside the heating liquid tank, so that the vapor of the heat transfer liquid can be discharged to the outside. It is economical because the amount of heat transfer liquid is extremely reduced and there is almost no need to replenish the heat transfer liquid. Also, while the intermittent conveyance of the printed circuit board is stopped, the printed circuit board on the heated liquid tank is lowered and raised to perform soldering.
It has the advantage of reducing product costs without reducing productivity.

[Brief explanation of drawings]

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. 3 is a side view taken along the - line in FIG. 2. 4 is a view from the printed circuit board unloading port side in FIG. 2, FIG. 5 is a side view showing a further enlarged part of the printed circuit board feeding device, and FIG.
7 is a side view showing the details of the guide rail, FIG. 8 is a perspective view showing the vertical movement device for the guide rail for conveying printed circuit boards of the present invention, and FIG. FIG. 10 is a side sectional view showing an example of a conventional steam tank soldering device. In the figure, 1 is a printed circuit board, 2 is a chip component, and 3
1 is a solder paste, 6 is a heat transfer liquid, 7 is a heater,
8 is a heated 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, 23 is an engagement groove, 24 is a wheel, and 31 is a printed circuit board. A feeding device, 32 a pedestal, 37 a substrate, 38 a connecting plate, 39 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, 52
C, 52D is a sprocket, 53 is a motor, 61
63 is a vertical movement device, 63 is a movable table, 65 is a hydraulic cylinder, 66 is a rod, 67, 68 are support rods, 70 is a movable rail, 71 is an engaging portion, 77 is a guide shaft, 78
is an information board.

Claims (1)

[Claims] 1. 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 this 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 to cool the steam. The printed circuit board transport device used includes a guide rail provided with an engagement groove for engaging the printed circuit board along the transport path of the printed circuit board, and an upper portion of the heated liquid tank in the middle of the guide rail. a movable rail that is a guide rail on which the provided printed circuit board is placed and moves up and down; a drive device that moves the movable rail up and down and inserts and removes the printed circuit board into the heated liquid tank; a long shaft provided parallel to the shaft; a plurality of engagement pieces fixed at predetermined intervals in the longitudinal direction of the shaft to engage and disengage from the printed circuit board; The engagement piece is reciprocated at a predetermined interval in the direction and rotated in the circumferential direction around the axis of the shaft body by a predetermined angle in the forward and reverse directions to engage and disengage the engagement piece from the printed circuit board, thereby removing the printed circuit board. What is claimed is: 1. A printed circuit board conveyance device equipped with a vertical movement device for a guide rail, characterized in that it is equipped with a drive means for sequentially and intermittently conveying the circuit boards.