JPH0466397B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cleaning position for printed circuit boards in which cleaning is performed while holding the soldered printed circuit board in a vertical position with respect to a horizontal position. .

[Prior art] In carrierless soldering equipment, after electronic components are mounted on a printed circuit board, the printed circuit board is engaged with an engaging piece of a conveyance chain and conveyed horizontally, and undergoes flux treatment, preheating, and soldering treatment. All cleaning processes were performed at the same speed.

[Problem that the invention seeks to solve]

By the way, cleaning processing for printed circuit boards takes more time than flux processing, preheating, and soldering processing, so if the printed circuit boards are transported at the same speed, the cleaning time will be shorter when the printed circuit boards are cleaned by a cleaning device. I end up. For this reason, if the cleaning device is set long in the direction of conveyance of the printed circuit board in order to perform sufficient cleaning, the entire soldering device becomes large and the space for installing the soldering device becomes large. .

Furthermore, since the printed circuit board is held horizontally by a conveyance chain for cleaning, there is a problem in that cleaning liquid adhering to the upper surface of the printed circuit board is difficult to drain.

This invention was made in order to solve the above problem, and the printed circuit board that has been conveyed in the horizontal direction is transformed from a horizontal position to a vertical position, and then a cleaning liquid is sprayed on the printed circuit board, thereby cleaning and running out of the cleaning liquid. An object of the present invention is to obtain a printed circuit board cleaning device that can sufficiently perform the following steps.

[Means for solving problems]

The printed circuit board cleaning device according to the present invention includes:
a conveyance device comprising means for horizontally conveying soldered printed circuit boards one after another; means for converting the holding direction of the printed circuit boards conveyed from the conveyance device from a horizontal position to a vertical position; means for transporting the printed circuit board located at the subsequent stage;
a printed circuit board holding direction changing device comprising means for moving the printed circuit board in a direction perpendicular to the conveyance direction while holding the printed circuit board in a vertical position; a first group of baskets and a second group of baskets, each of which is sequentially stored and arranged in parallel with the conveyance direction of the printed circuit board;
a cleaning device main body comprising means for lowering and raising these baskets, a cleaning tank for cleaning each of the printed circuit boards when each of the baskets is lowered, and a means for sequentially transferring the printed circuit boards in each basket; It consists of

[Effect]

In this invention, first, an odd-numbered printed circuit board that has been soldered is transported while being held horizontally by a transport device, is converted to a vertical direction at a printed circuit board holding direction conversion position, and then is placed in a vertical position. The printed circuit board is transported to a first group of cages. Next, the printed circuit board holding direction changing device is returned to a state where even-numbered printed circuit boards are transported in a horizontal position, and after the printed circuit board holding direction changing device is transferred to the even-numbered printed circuit boards, the printed circuit board is converted to vertical position. In this state, the printed circuit board is transferred by a means that moves in a direction perpendicular to the transfer direction, and then transferred to the second group of baskets and then transferred to the main body of the cleaning apparatus.

Each printed circuit board in a vertical position that is transported to each basket of the cleaning device main body is cleaned by spraying a cleaning liquid onto both sides of the printed circuit board in a vertical position in the cleaning device main body.

〔Example〕

Figure 1 a-c, Figure 2 a, b, Figure 3 a, b,
FIG. 4 shows one embodiment of this invention.
Figure a is a plan view, Figure 1 b is a side view, Figure 1 c is a sectional view taken along the - line in Figure 1 a, Figures 2 a and b are a front view and a plan view showing a printed circuit board conveyance device,
3a and 3b are a front view and a plan view showing the printed circuit board holding direction changing device, and FIG. 4 is a perspective view showing the main part of FIG. 1. In these figures, 1 indicates the entire printed circuit board cleaning apparatus. P is a printed circuit board on which electronic parts and chip parts are mounted.
2 is a conveying device for the printed circuit board P; 3 is a printed circuit board holding direction converting device (hereinafter simply referred to as a converting device) for vertically standing the printed circuit board P that is being conveyed horizontally; and 4 is a converting device for the printed circuit board; This is a main body of a cleaning device that cleans the printed circuit board P.

In the conveyance device 2, a conveyance chain 5 serving as a means for horizontally conveying the printed circuit board P is wound inside a fixed plate 6 and a movable plate 7, and in order to place the printed circuit board P on the fixed plate 6 side. and protrusions (not shown) protruding from the conveyance chain 5 on the moving plate 7 side in a horizontal direction, respectively.

As a substrate width adjustment mechanism, a screw rod 8 is screwed into a movable plate 7 and loosely fitted into a fixed plate 6, and a handle 9 is fixed thereto. Reference numeral 10 denotes a screw rod on the drive side, which has the same structure as the screw rod 8, and is a drive shaft for transmitting drive to the substrate width adjustment mechanism in the conversion device 3. 11 is a roller chain connecting the threaded rods 8 and 10, and 12 is a drive shaft for driving the conveyance chain 5. Reference numeral 13 denotes a long key fixed to the drive shaft 12, and this key 13 prevents the gear 12a from rotating and holds the gear 12a slidably. A guide shaft 14 slidably holds the movable plate 7. 15 is a motor that drives the drive shaft 12. That is, the handle 9
By rotating the conveyor chain 5 on the moving plate 7 side,
The holding width of the conveyance chain 5 can be adjusted in various ways depending on the width of the printed circuit board P.

A substrate transfer cylinder 18 is provided on the rod 17 of the vertical movement cylinder 16 as a means for transferring the substrate to the next stage conversion device 3. A piston 19 is guided by a guide shaft 20 in the substrate transfer cylinder 18, and a notch pin 21 is fixed to the piston 19. In addition, the transport device 2
A detector 22 is disposed below the printed circuit board P that has been transported, and this detector 22 detects the presence or absence of the printed circuit board P in the transport device 2 . 23 is a roller chain for transmitting power to the substrate width adjustment mechanism in the conversion device 3.

In the converting device 3, the rotating table 38 is provided with a substrate width adjustment mechanism, and power is transmitted from the roller chain 23 to the screw rod 34 via the gears 31, 32, 33 to the substrate width adjustment mechanism. The screw rod 34a is configured to receive power via a roller chain 35.

Further, a fixed side guide rail 36 is conveyed to one end of the screw rods 34a, 34a, and the screw rod 3
The guide rail 3 on the moving side is attached to the threaded part of 4 and 34a.
7 are screwed together. Each guide rail 36, 37
each has an engagement groove 3 for engaging the printed circuit board P.
6a and 37a are provided so as to be able to hold the printed circuit board P. The rotating table 38 is rotatably supported by the moving table 41 via a rotating shaft 39, and the rotating shaft 39 is fixed to the rotating table 38. A motor 40 is fixedly installed on the moving table 41, and this motor 40
is configured such that power is transmitted to the rotating shaft 39 via a chain in order to rotate the rotating table 38 from a horizontal position to a vertical position or from a vertical position to a horizontal position.

The moving table 41 is guided by a guide shaft 42 and is disposed so as to be slidable in the conveying direction of the printed circuit board P. The moving table 41 is arranged so that an air cylinder 43 can move in the above-mentioned direction via a rod 44, and a rodless type air cylinder 45 is installed on the upper part of the moving table 41 in parallel with the conveyance direction of the printed circuit board P. are equipped with facilities. Also,
As a means for pushing the printed circuit board P and transporting it to the next cleaning device main body 4, the air cylinder 45 has a piston 46 guided by a guide shaft 47, and the piston 46 has a substantially L-shaped transfer plate 48. It is fixed.

In the cleaning device main body 4, the cleaning tank section 50 consists of a hot liquid cleaning tank 51, a cold liquid cleaning tank 52, and a drying tank 53. The liquid cleaning tank 52 contains Freon cold liquid, and the drying tank 53 contains Freon vapor, and these tanks 51, 52, and 53 are arranged in sequence in the transport direction. The cleaning tank section 5
Cylinder 59 for raising and lowering the basket is installed near the four corners of 0, and holding plates 58 are fixedly installed in parallel to the rod 60 of the cylinder 59 in parallel with the conveying direction. It serves as means for vertically moving the first and second groups of baskets. A first group of baskets 54, 55, 56 and a second group of baskets 70, 71, 7 are connected to each holding plate 58 via a large number of hanging fittings 57.
2 are each suspended. These first group of baskets 54 to 56 and second group of baskets 70 to 72 hold the printed circuit board P sent from the conversion device 3 in an upright state.For example, the first group of baskets 54 to 56 The odd-numbered printed circuit boards P are placed in the second group of baskets 70.
-72 are configured to hold even-numbered printed circuit boards P. And each basket 54,70
are arranged so as to correspond to the hot liquid cleaning tank 51, each of the baskets 55 and 71 to the cold liquid cleaning tank, and each of the baskets 56 and 72 to the drying tank 53, respectively.

A slide cylinder 68 is disposed at both ends of the cleaning tank section 50 parallel to the conveying direction, and a slide plate 67 is fixed to a rod 69 of the slide cylinder 68. A shaft 64 is rotatably fixed to the slide plate 67 parallel to the slide plate 67, and the feed fitting 61,
62 and 63 are fixed. Further, the shaft 64 is driven by the motor 65 to rotate the feed fittings 61 and 6.
2 and 63 are configured to be rotated about 90 degrees from a horizontal state, and serve as a means for transporting the printed circuit board P.

Further, in the cleaning tank section 50, a hot liquid jetting pipe 73 for spouting a hot Freon liquid is provided at the inner center of the hot liquid cleaning tank 51, and a Freon jet pipe 73 is provided at the inner center of the cold liquid cleaning tank 52. A cold liquid spouting pipe 74 is provided for spouting cold liquid. The bottom of the drying tank 53 is filled with a Freon liquid 75, and a heater 76 is disposed in the Freon liquid 75 to heat the Freon liquid 75 and turn it into steam. A cooling pipe 77 for cooling the vapor of the Freon liquid 75 is provided.

In FIG. 4, reference numeral 78 denotes guide rails provided in the first group of cages 54 to 56, which guide the movement of the printed circuit board P and hold it vertically. Of course, they are similarly provided on the second group of baskets 70 to 72. Reference numeral 79 denotes a guide rail provided on the cleaning device main body 4.

Next, the operation will be explained.

First, turn the handle 9 to align the conveyor chain 5 and guide rail 3 to the holding width of the printed circuit board P.
7 and move it.

Next, the motor 15 is driven to move the conveyance chain 5.
drive.

Next, a soldering device (not shown) sequentially sends the soldered printed circuit boards P to the transport device 2, where they are placed on the engagement protrusions (not shown) of the transport chain 5. Transfer. Then, when the leading end of the printed circuit board P in the transport direction is detected by the detector 22, the operation of the transport chain 5 is stopped.

Next, the vertical movement cylinder 16 is operated to raise the substrate transfer cylinder 18 by the rod 17, and it is stopped at the position where the notch pin 21 engages with the printed circuit board P.

Next, the piston 19 is moved to push the printed circuit board P with the notch pin 21 to transport it and engage it with the guide rails 36, 37 of the conversion device 3.

Next, when the first printed circuit board P is transferred to and engaged with the guide rails 36 and 37, the motor 40 is driven to rotate the rotating table 38, and the direction shown by the two-dot chain line in FIG. As shown, the rotating table 38 is raised to a vertical position, and the printed circuit board P is positioned vertically.
At this time, gears 33 and 32 are disengaged.

Next, when the air cylinder 45 is driven, the piston 46 moves to transport the first printed circuit board P (hereinafter the same applies to odd-numbered printed circuit boards) and insert it into the basket 54 of the cleaning device main body 4. .
After the first printed circuit board P is inserted into the basket 54, the rotating table 38 and the transfer plate 48 operate in the opposite manner to the above to return it to its original position.

Next, when the second printed circuit board P (hereinafter the same applies to even-numbered printed circuit boards) is sent and engaged with the guide rails 36 and 37, the rotating table 38 is vertically moved in the same manner as above. hold it in place,
In the case of the second printed circuit board P, the air cylinder 43 is driven and the rotary table 3 is inserted through the rod 44.
8 is moved from the position shown by the two-dot chain line in FIG. 5 in a direction perpendicular to the conveying direction of the printed circuit board P to the position shown in FIG. 6. Next, the air cylinder 45 is driven to insert the second printed circuit board P into the basket 70, and then the rotation table 38 is moved by the reverse operation to the above.
The transfer plate 48 is returned to its original position.

Next, the basket 54 containing the first printed circuit board P is lowered by the drive of the cylinder 59 and enters the hot liquid cleaning tank 51, and hot liquid of Freon liquid 75 is spouted from the cold liquid spouting pipe 74. After being cleaned, it rises and returns to its original position.

Note that while the first printed circuit board P is being cleaned, the operation of inserting the second printed circuit board P into the basket 70 is performed.

Next, when the motor 65 is driven, the feed fitting 61
63 rotates from the position indicated by the two-dot chain line in FIG. 1c to the position indicated by the solid line where the first printed circuit board P is engaged. Next, the slide cylinder 68 is driven to move the feed fitting 61 through the slide plate 67 to the first position.
Since the printed circuit board P is pushed, the printed circuit board P is stored in the basket 55. Next, the printed circuit board P is lowered by the same operation as above, and the Freon liquid 75 is
Clean the printed circuit board P with the cold liquid. After cleaning, the basket 55 rises and returns to its original position, and the third (odd-numbered) printed circuit board P is inserted into the basket 54. During this time, the basket 70 moves up and down, and the second printed circuit board P is cleaned with the warm Freon liquid 75.

Next, the first printed circuit board P is sent to the basket 56 of the drying tank 53 in the same manner as described above, and is dried by the vapor of the Freon liquid 75 heated by the heater 76 to complete the cleaning. Note that the generated vapor of the Freon liquid 75 is cooled by the cooling pipe 77 and returns to the Freon liquid 75.

The odd-numbered printed circuit boards P sent sequentially from the soldering machine in this way are placed in the first group of baskets 5.
On the 4th to 56th sides, the even numbered printed circuit boards P are the second
They are stored alternately in the baskets 70 to 72 of the group and are washed and dried.

In addition, in order to smoothly carry out the conveyance and cleaning of the printed circuit board P, in the illustrated apparatus, the first group,
Six cages 54 to 56 and 70 to 72 are provided in the second group, but in order to clean the printed circuit board P and to continuously transport the printed circuit board P, it is necessary to It is necessary to provide at least two or more in parallel to each other.

〔Effect of the invention〕

As explained above, the present invention includes a conveyance device equipped with means for horizontally conveying printed circuit boards that have been soldered one after another; A printed circuit board holding direction changing device comprising: a means for converting the printed circuit board in the vertical position; a means for transporting the printed circuit board in the vertical position to a subsequent stage; and a means for moving the printed circuit board in a direction perpendicular to the transport direction while holding the printed circuit board in the vertical position. and; at least two or more first
a group of baskets and a second group of baskets, and lowering these baskets;
The main body of the cleaning device includes a means for raising each basket, a cleaning tank for cleaning each printed circuit board when each basket is lowered, and a means for sequentially transferring the printed circuit boards in each basket. It can be used in conjunction with a carrier-less soldering device, and the printed circuit board can be automatically transferred to the next device. In addition, it eliminates the need to manually replace a printed circuit board in a horizontal position to a vertical position, or to alternately feed it into baskets arranged in parallel. cleans well, and no cleaning fluid remains on the printed circuit board. Furthermore, even if the printed circuit board is transported intermittently in the cleaning device, the main body of the cleaning device can transport the printed circuit board at the same speed as the continuous transport in the processing steps of the printed circuit board up to the front stage of the cleaning device, so there is no reduction in the transport speed. In addition, since the main body of the cleaning device can be downsized, it has advantages such as being economical and improving the quality of printed circuit boards.

[Brief explanation of drawings]

Figure 1 a-c, Figure 2 a, b, Figure 3 a, b,
FIG. 4 shows one embodiment of this invention.
Figure a is a plan view, Figure 1 b is a side view, Figure 1 c is a sectional view taken along the - line in Figure 1 a, Figures 2 a and b are a front view and a plan view showing a printed circuit board conveyance device,
Figures 3a and 3b are front and plan views showing the printed circuit board holding direction changing device, Figure 4 is a perspective view showing the main parts of Figure 1, and Figures 5 and 6 are the same as Figure 3. It is a figure which shows operation|movement. In the figure, 1 is a printed circuit board cleaning device, 2 is a transport device, 3 is a printed circuit board holding direction changing device, 4 is a main body of the cleaning device, 5 is a transport chain, 12 is a drive shaft,
15 is a motor, 16 is a vertical movement cylinder, 18 is a substrate transfer cylinder, 21 is a notch pin, 31,
32 and 33 are gears, 36 and 37 are guide rails,
36a, 37a are engagement grooves, 38 is a rotating base, 39 is a rotating shaft, 40 is a motor, 41 is a moving base, 43, 4
5 is an air cylinder, 48 is a transfer plate, 50 is a cleaning tank section, 51 is a hot liquid cleaning tank, 52 is a cold liquid cleaning tank, 53
is the drying tank, 54, 55, 56 are the first group of baskets, 7
0, 71, 72 are the second group of cages, 58 is the holding plate, 5
9 is a cylinder, 61, 62, 63 are feed fittings, 6
4 is the shaft, 65 is the motor, 67 is the slide plate, 68
is a slide cylinder, 73 is a hot liquid discharge pipe, 7
4 is a cold liquid jetting pipe, 75 is a Freon liquid, 77 is a cooling pipe, and P is a printed circuit board.

Claims (1)

[Claims] 1. A conveyance device equipped with a means for horizontally conveying soldered printed circuit boards in sequence; means for converting the holding direction of the printed circuit boards conveyed from this conveyance device from a horizontal position to a vertical position;
A printed circuit board holding direction changing device comprising means for conveying a printed circuit board in a vertical position to a subsequent stage, and means for moving the printed circuit board in a direction perpendicular to the conveying direction while holding the printed circuit board in a vertical position; The printed circuit boards conveyed from the direction changing device are sequentially housed in a vertical position, and a first group of baskets and a second group of at least two baskets each are arranged parallel to the direction of conveyance of the printed circuit boards.
The method comprises a group of cages, means for lowering and raising these cages, a cleaning tank for cleaning each of the printed circuit boards when each of the cages is lowered, and a means for sequentially transferring the printed circuit boards in each of the cages. A cleaning device for a printed circuit board, comprising: a cleaning device body; and;