JPH05161965A - Device for carrying printed board and method for cleaning carrying chain - Google Patents

Abstract

PURPOSE:To obtain the printed board carrying device which can easily remove the flux sticked to the carrying chain and can easily maintain the device. CONSTITUTION:At a carrying device 10 for carrying the printed board to the upper side of a coating device 11 in order to coat the surface to be coated of the printed board with the flux by the flux coating device 11 providing the coating means of the spraying nozzle, etc., a pair of guide rolls 37, a carrying chain 38 which is moved along the guide rolls 37 and circulated downward together and a cleaning tank 50 set at the lower side of the guide rail 37 are composed, and the carrying chain 38 is introduced in the cleaning tank 50 and immersed in the cleaning liquid 55 received in the tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed board carrying device and a method for cleaning a carrying chain, and more particularly to a carrying device for carrying a printed circuit board so as to apply a flux on a coated surface of the printed circuit board by a coating device. The present invention relates to an apparatus and a method for cleaning a transport chain that constitutes the apparatus.

[0002]

2. Description of the Related Art In order to attach various electronic components to a printed circuit board by soldering, the soldering work should be carried out effectively and accurately, and at the same time, the erroneous judgment rate of the in-circuit test performed after the soldering should be reduced. Prior to the above, it is necessary to uniformly apply the flux to the back surface of the printed board with a predetermined film thickness. Then, various coating apparatuses for uniformly coating the flux have been developed, and such coating apparatuses include, for example, a foaming air tube for coating the foaming flux, a spray nozzle for coating the atomized flux, and the like. Means are provided to apply the flux to the coated surface of the printed circuit board that moves past these coating means. Here, in order to move the printed circuit board above the coating means, a transfer device including a pair of guide rails that cross over the coating means and a transfer chain that moves along the guide rails is used.
In such a transfer device, the transfer chain circulates horizontally around each guide rail, passes through a washer equipped with a cleaning brush, etc., provided on the side opposite to the opposite side of each guide rail, and the flux Remove the flux adhering to the carrier chain during application of.

[0003]

However, it is not easy to remove the flux by the cleaning device in such a conventional printed board carrying apparatus. That is, the brush of the cleaning brush does not reach the details of the transport chain, and if the cleaning brush is pressed hard to remove the residue attached to the details, the wear of the cleaning brush becomes severe, and therefore,
The flux that could not be removed is solidified, which reduces the function of the carrier chain, increasing the load on the motor and causing maintenance problems such as seizure of the motor.

Therefore, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a printed board carrying device which is advantageous for maintenance of the device by easily removing the flux attached to the carrying chain.

The present invention also provides a method for cleaning a carrier chain, which can easily remove the flux attached to the carrier chain.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above object, and its gist is to provide a surface to be coated of a printed circuit board by a coating device having a coating means such as a spray nozzle or a foaming air tube. A transport device for transporting a printed circuit board above the coating means for applying flux to the substrate, the transport device comprising a pair of guide rails that cross over the coating means and along the guide rails. And a cleaning tank provided below the guide rail, wherein the conveyor chain is guided to the cleaning tank and immersed in the cleaning liquid contained therein. It is in a printed board carrying device.

Here, in order to guide the transport chain to the cleaning tank, it is performed, for example, via a pulley. Further, it is preferable that a cleaning means such as a cleaning brush and a jet spraying device is provided in the cleaning tank. The cleaning tank contains alcohol, chlorophene, a fluorine-based solvent, or the like as a cleaning liquid for removing the flux.

Another aspect of the present invention is to apply a flux to a surface to be coated of a printed circuit board by a flux coating device having a coating means such as a spray nozzle or a foaming air tube. A method of cleaning a carrier chain that constitutes a carrier device for carrying a carrier to the upper part of a container, in which the carrier chain is guided into a cleaning tank, immersed in a cleaning liquid contained therein, and a cleaning brush and a jet spraying device in the cleaning liquid. A cleaning method for a transport chain is characterized in that flux attached to the transport chain is removed by cleaning means such as.

Here, the cleaning tank for guiding the transport chain does not necessarily have to be located below the transport device.

[0010]

In the printed board carrying device of the present invention, the carrying chain circulates downward and is immersed in the cleaning liquid in the cleaning tank provided below the guide rails, and the flux attached to the carrying chain is so-called "flux" in the cleaning liquid. It will be in a "fuzzy" state. Therefore, the flux adhered to the details can be easily removed by the cleaning means such as the cleaning brush and the jet spraying device. Further, the cleaning tank is located below the guide rail, and the structure of the coating device for mounting the cleaning tank is made compact.

Further, in the method for cleaning a carrier chain according to the present invention, the carrier chain is immersed in the cleaning liquid in the cleaning tank so that the flux adhered to the carrier chain is in a so-called "foggy" state in the cleaning liquid as described above. This facilitates the removal of the flux by the cleaning means such as the cleaning brush and the jet spraying device.

[0012]

An embodiment of the present invention will now be described in more detail with reference to the accompanying drawings.

A printed board carrying device 10 according to the present embodiment.
As shown in FIG. 1, a flux coating device 12 is configured with a coating device main body 11 and is used by being incorporated in a coating system 100. That is, the coating system 100
Is a coating device 12 including a coating device main body 11 and a transfer device 10 for passing a printed circuit board to which flux is to be applied in the X direction above the air nozzle opening 13 of the coating device main body 11, and is further arranged above this. The primary filter device 14 and the secondary filter 15 which are provided, and a casing 16 that covers them are configured. Reference numeral 17 is a duct for ventilating the inside of the housing 16.

As shown in the longitudinal sectional view of FIG. 2 and the transverse sectional view of FIG. 3, the coating apparatus main body 11 includes a flux tank 18 and a cylindrical drum 1 which is rotatably mounted in the flux tank 18.
9 and an air tank 20 fixedly arranged inside the cylindrical drum 19. The flux tank 18 is a box body that accommodates the flux liquid 21 in the lower part and covers the cylindrical drum 19 and the air tank 20, and an air nozzle opening 13 is provided on the upper end surface at a position facing an air nozzle 31 described later. The cylindrical drum 19 is composed of a mesh plate, a punch plate, etc., and the size of these meshes or holes is designed so that a flux liquid film is surely formed on them in relation to the concentration of the flux liquid. There is. Then, the cylindrical drum 19 slowly rotates around the inner cylinder air supply pipe 23, which will be described later, as an axis.
It should be noted that this rotary drive is performed by the drive shaft 2 driven by the drive motor 24.
The rotation 4'is performed via the drive gear 25 and the rotary gear 26 on the outer periphery of the end portion of the cylindrical drum 19. The lower portion of the cylindrical drum 19 is immersed in the flux liquid 21, and the flux liquid 21 is attached to the mesh of the cylindrical drum 19 in a film shape as the cylindrical drum 19 rotates and is conveyed upward. On the other hand, the air tank 20 has a double structure including an inner cylinder air supply pipe 23 and an outer cylinder air tank 27. The inner cylinder air supply pipe 23 is axially fixed to a support wall 28 installed in the flux tank 18, serves as the rotating shaft of the cylindrical drum 19 as described above, and has an outer cylinder air tank 27 at both ends on the outer periphery thereof. Fix tightly. Further, the inner cylinder air supply pipe 23 is provided with air blowout holes 29 opening downward in a row at a predetermined interval in a row in the axial direction, and the outer cylinder air tank 27 has an upper end outer peripheral surface in the axial direction. A linear notch 30 having a substantially V-shaped cross section that does not penetrate the inside is provided, and a number of air nozzles 31 that penetrate the inside of the outer cylinder air tank 27 are provided along the notch 30.

As shown in FIG. 4, the carrier device 10 has a pair of rail members, that is, a fixed rail 35 and a movable rail 36, disposed above the coating device main body 11.
Conveyor rare rail 3 as a guide rail consisting of
7, a conveyor chain 38 that is attached to the inner surface of the conveyor rare rail 37, and moves along the conveyor chain 38, and a claw 39 that holds the printed circuit board 33 locked by the conveyor chain 38, Further moving rail 3
Below the reference numeral 6, the air nozzle opening 1 of the coating apparatus main body 11 is provided.
A nozzle cover 40 that closes a part of the nozzle 3 is fixed via a support member 41. The moving rail 36 slides in a direction Y perpendicular to the carrying direction X of the printed circuit board 33, that is, in the width direction of the printed circuit board 33, and the printed circuit board 3
The conveyor rare rail 37 is positioned in accordance with the width of the nozzle 3, and at the same time, the nozzle cover 40 is also moved by the moving rail 36.
It slides together with the width of the printed circuit board 33 to cover a predetermined area of the air nozzle opening 12.

As shown in FIG. 1, the carrier device 10 is provided with a cleaning tank 50 located below the flux tank 18 of the coating apparatus main body 11 below the conveyor rare rail 37. A cleaning liquid 55 such as alcohol for cleaning the transport chain 38 is stored therein. Then, the transport chain 38 circulates vertically through a plurality of pulleys 51, and the pulleys 5 provided in the cleaning tank 50
1'is partially immersed in the cleaning liquid 55. Also,
In the cleaning tank 50, a cleaning device (not shown) such as a cleaning brush and a jet spraying device is provided.

According to the coating device 12 having such a structure, the air nozzle 31 is carried by the carrying device 10.
The flux can be uniformly applied to the back surface of the printed circuit board 33 that passes above in the X direction. That is, the sensor causes the printed circuit board 33 to move to the air nozzle 31.
When it is sensed that the air has been conveyed above the air, air is fed from the high-pressure air supply pipe 60 to the air tank 20, and the air blown from the air nozzle 31 adheres to the mesh of the cylindrical drum 20 in a film form and moves upward. The flux liquid conveyed to the substrate is sprayed onto the back surface of the printed circuit board 33 through the air nozzle opening 13 (see FIGS. 2 and 3). Then, when the printed circuit board 33 has finished passing above the air nozzle 29, it is sensed by the sensor again and the air supply is stopped, and the application of the flux is completed.

In the carrier device 10 of the present embodiment, the flux attached to the carrier chain 38 can be easily removed when the flux liquid is sprayed on the back surface of the printed circuit board 33. That is, as shown in FIG. 1, the transport chain 38 that has moved along the conveyor rare rails 37 and transported the printed circuit board 33 then circulates downward by the pulley 51, and then the cleaning tank 50 through the pulley 51 ′.
It is moved by immersion in the cleaning liquid 55 housed in. As a result, the flux adhering to the transport chain 38 becomes a so-called "bluffed" state in the cleaning liquid 55, and it is easy to remove the flux that has adhered to the details due to the cleaning brush or the jet flow from the jet spraying device.

In this embodiment, the case where the carrier device 10 of the present invention is used as a so-called air nozzle type flux coating device has been described, but the carrier device 10 of the present invention is used.
Can be applied to other so-called foaming type or jet powder type coating devices.

Further, in the present embodiment, the case where the cleaning tank is provided below the guide rail has been described, but the cleaning method of the transfer chain of the present invention is not limited to this, and the transfer chain is transferred along the periphery of the guide rail, for example. When the chain circulates horizontally, a washing tank can be provided on the side of the guide rail.

[0021]

As described above, the printed circuit board carrying device of the present invention comprises a carrying chain which circulates below the guide rail and a cleaning tank provided below the guide rail. Since it is guided into and immersed in the cleaning liquid contained in the cleaning liquid, the flux adhered to the details can be easily removed by the cleaning means such as the cleaning brush and the jet spraying device in the cleaning liquid. It is possible to obtain the effect of facilitating. Further, by disposing the cleaning tank below the guide rail, it is possible to make the structure of the coating device for mounting the transport device compact.

Further, in the method of cleaning the carrier chain, since the carrier chain is guided into the cleaning liquid contained in the cleaning tank and is immersed in the cleaning liquid, cleaning is performed by cleaning means such as a cleaning brush and a jet spraying device. It is possible to reduce the load of the above to reduce these damages and to easily remove the adhered flux in detail.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a coating system using a printed board carrying device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an example of a coating apparatus main body which constitutes a flux coating apparatus.

FIG. 3 is a cross-sectional view showing an example of a coating apparatus main body which constitutes a flux coating apparatus.

FIG. 4 is a partially cutaway perspective view showing a printed board carrying device of the present invention.

[Explanation of symbols]

 10 Transport Device 11 Coating Device Main Body 12 Coating Device 13 Transport Device 31 Air Nozzle (Coating Means) 33 Printed Circuit Board 37 Conveyor Rail (Guide Rail) 50 Cleaning Tank 51, 51 'Pulley 55 Cleaning Solution

Claims (2)

[Claims] 1. A transport device for transporting a printed circuit board above the coating device so as to coat the coated surface of the printed circuit board with the flux by a flux coating device having a coating device such as an injection nozzle. The transfer device comprises a pair of guide rails that cross over the coating means, a transfer chain that moves along the guide rails and circulates downward, and a cleaning tank provided below the guide rails. A conveyance device for a printed circuit board, wherein the conveyance chain is guided into the cleaning tank and immersed in the cleaning liquid contained therein. 2. A transport device for transporting the printed circuit board above the coating device in order to coat the coated surface of the printed circuit board with the flux by the flux coating device having the coating device such as a spray nozzle. A method of cleaning a transport chain, in which the transport chain is guided into a cleaning tank, immersed in a cleaning liquid contained therein, and the flux adhered to the transport chain by cleaning means such as a cleaning brush and a jet spraying device in the cleaning liquid. A method for cleaning a transport chain, which is characterized by removing.