JPS59100593A - Injection device for waxing processor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spraying device for a wax processing apparatus that sprays molten wax onto a printed circuit board on which electronic components to be soldered are attached to temporarily fix the printed circuit board.

Fig. 1 is a block diagram showing an example of conventional soldering equipment, where 1 shows the entire soldering equipment, 2 shows the processing equipment for preliminary soldering, 3 shows the cutting equipment, and 4 shows the processing equipment for final soldering. It is a device. In these devices, 5.9 is a Franks processor, 6°10 is a preheater, 7 is a tip type solder bath, 8.12 is a cooler, and 11 is a jet type solder 4Vi.

FIG. 2 is a partial side sectional view showing how electronic components are mounted on a printed circuit board, 13 is a printed circuit board, 14 is an electronic component such as a resistor, capacitor, IC, etc., and 15 is a lead wire of the electronic component 14 ( or y-F terminal), 16 is a through hole through which the lead wire (or lead terminal) 15 is inserted.

In this way, with conventional soldering equipment, the printed circuit board 13 is heated twice to adhere molten solder, once for preliminary soldering and once for final soldering, resulting in a large amount of solder consumption. and electronic components 14
In addition, when final soldering is performed after inserting the lead terminal 15 of the IC component into the through hole 16 of the printed circuit board 13, the IC component may be lifted up by the force of the solder jet. There were drawbacks.

In addition, since processing equipment 2 for preliminary soldering has the same equipment as processing equipment 4 for finishing soldering, equipment 1 for soldering
The overall size is large, and the soldering process requires a large area when installing the equipment 1, which has the disadvantage of being expensive.

This invention was developed in view of the above points, and includes a wax processing unit that sprays molten wax onto the top surface of a printed circuit board, cools it, and then temporarily fixes electronic components on the printed circuit board with wax. The present invention provides a spraying device for spraying the molten wax stored in the wax phase body of the wax processing section. This invention will be explained below.

Figure 3 is a schematic configuration diagram showing one embodiment of this Ummei.
1 shows the entire soldering/winding device without carrier 7.

Reference numeral 22A denotes a conveyance chino on the fixed side, 22B a conveyance chino on the town IJJJ side, 23 a processing device with wax, 24 a wax treatment section, and 25 a melted bath wax that has been turned into a dispersed fluid by heating. Next, the operation shown in FIG. 3 will be explained.

The electronic components 14 are placed on the printed circuit board 13 and the lead wires 1 are attached.
5 protrudes downward.

Next, molten wax 25 is sprayed onto the top surface of the printed circuit board 13 in the wax processing section 24, and then the sprayed molten wax 25 is solidified in the cooler 8, so that the electronic components 14 are assimilated onto the printed circuit board 13. Covered with wax and fixed.

Further, in the case of an IC component, the molten wax 25 also penetrates between the lead terminal 15 and the through hole 16 and is fixed.

Next, the lead wire 15 is cut by the cutting device 3,
Finish soldering is done using Franks processor 9 in processing section @4. Preheater 10. Solder 41'V11. The solder is soldered through each processing step of the cooler 12.

Figures 4(a) and (b) show the wax processing section 2 in Figure 3.
Figure 4 (a) is a partially broken to perspective view, Figure 4 (b) is an enlarged view of Figure 4 (a) f) X-X iW. FIG. In these figures, the same ladle numbers as in FIG. A gear pump is provided below the main body 26, 28 is a motor that drives the gear pump 27, 29 is a control valve that regulates the flow and pressure of the molten wax 25, 30 is the melting 2773250 passage, and 31 is the molten wax. 25
A filter for removing dust mixed therein; 32 is a passage through which the molten wax 25 filtered by the filter 31 passes;
3 is a plurality of pipes branched from the passage 32 and connected in parallel; 34 is a flexible tape heater wrapped around the outer circumference of the pipe 33 to prevent the molten wax 25 passing through the pipe 33 from solidifying; It's heating up.

35 is a heat insulating material that covers the outer periphery of the tape heater 34; 36;
3 is a spraying device for spraying the molten wax 25, which is attached to each of the plurality of pipes 33 via a connecting fitting 3T, and is similar to the soldering device 21 in FIG.
A plurality of printed circuit boards 130 are arranged in a direction perpendicular to the running direction of the printed circuit boards 130 transported by the carrying chenos 22A and 22B. A thermostat 38 detects the temperature of the molten wax 25 within the wax shield body 26.

Note that 39 is a removable container for removing dust etc. from the filter 31, and 40 is a control board.

In the gear pump 27, 41 is a drive shaft, and the motor 28
is connected to. 42 is a driven shaft.

In FIG. 4(b), 43 is a guide shaft that serves as a guide for assembling the gear pump 2T, and 44 is a guide shaft that serves as a guide for assembling the gear pump 2T, and 44 is a shaft that connects the gear pump 27 to the wax 411 body 26, the shaded part in FIG. 4(b). The spur gears 46
is fixed to the drive shaft 41, and the spur gear 4T is fixed to the driven shaft 42. 48 is a spur gear 46.4 on the lower surface of the upper case 45.
A gear case 49 is housed by surrounding the side of the th
A disc-shaped base on which the car case 4B is placed, and 50 are screws for assembling the gear pump 2T. Further, 40 is the amount of molten wax 25 formed on the fixture 44, 45
a, 48a are delivery holes for sending out the eluted molten wax 25 from the introduction port 44a, and 51 is the gear pump 2.
The supply holes 49b, 52 for supplying the molten wax 25 from the passage 30.

Next, the operations in Figures 4 (-) and (b) will be explained.

The solid wax charged in the wax mixing body 26 is heated by a heater (not shown) to become molten wax 25, the temperature is detected by a thermostat 38, and maintained at a constant temperature by operation on a control panel 40. .

A pair of spur gears 4 of the gear pump 27 are driven by the motor 28.
6.47 rotates, the molten wax 25 in the wax cake body 26 is sucked and enters the inlet 44a, and enters the supply hole 4.
5a, 48a (arrow A) by the spur gear 46, 47, and further the delivery holes 48b, 49a, the supply hole 51
Enter (arrow B) into passage 30 through C.

The molten wax 25 in the passage 30 enters the inside of the filter 31, and after dust etc. are removed, it passes through the passage 32 (arrow C) and branches into several pipes 33 (arrow D), which are connected to the respective injection devices [ 36 to completely spray the printed circuit board 13 and the electronic components 14 layered on its upper surface.

On the other hand, the molten wax 25 in the passage 32.30 is
9, the flow rate and pressure are controlled by the passage 32.30, through the control valve 29 as shown by arrows E and F in FIG.
It is refluxed to 47.

FIG. 5 is an exploded perspective view of the gear pump 27, and the same parts as in FIGS. 4(a) and 4(b) are designated by the same reference numerals.
44c, 45c are insertion holes through which the drive shaft 41 is rotatably inserted; 49c is a support hole for the drive shaft 41; 44d, 4
5d is an insertion hole through which the driven shaft 42 is rotatably inserted;
9d is a support hole for the driven shaft 42, and 46c is a support hole for the drive shaft 4.
1 is a fixing hole for fixing the XV gear 46; 47c is a fixing hole for fixing the flat table 47 to the driven shaft 42;
44e.

45e, 48e, and 49e are insertion holes through which the guide shaft 43 is inserted; 44f, 45f, 48f, and 49f are the screws 5;
This is an insertion hole through which 0 is inserted.

When assembling, the drive shaft 41. The driven shaft 42° guide @ 43 is attached to the base 49, and the spur gears 46 and 47 are engaged with each other, and the driving shaft 41. It is fixed to the driven shaft 42. next,
After placing the gear case 48 on the base 49, the spur gear 46.
47, and then cover the upper case 45 over the top of the gear case 48 to form 2T.
and connect the drive shaft 41 to the motor 28.

Note that the operation of the gear pump 2T shown in FIG. 5 has been explained in FIGS. 4(a) and 4(b), and will therefore be omitted here.

FIG. 6 is a side sectional view showing details of the control valve 29, where the same reference numerals as in FIG. 62 is an adjustment valve screwed into the valve box 61, which adjusts the flow 3t of the molten wax 25 by rotation.
3 is a safety valve that automatically adjusts the pressure of the molten wax 25. 64 is a valve seat of the regulating valve 62, 65 is a valve seat of the safety valve 63, 66 is a spring that presses the safety valve 63 against the valve seat 65, and 6T is a regulating valve 62 provided at one longitudinal end of the valve box 61. 6B is an introduction hole on the safety valve 63 side provided at the other longitudinal end of the valve box 61; 69 is a discharge hole on the reflux hole 52 side provided between the introduction holes 67 and 68;
TO is an O-ring for water and soil.

Next, the operation shown in FIG. 6 will be explained.

The molten wax 25 pressurized by the rotation of the spur gears 46, 47 of the gear pump 2T is supplied to the supply hole 51. Aisle 30 maybe 4th
The filter 31 in figure (a) is passed through the trace path 32, and each pipe 33.
The molten wax 2 in the passage 32 is injected from the injection device 36 through the passageway 32, but if you want to adjust the amount of injection, you can open the adjustment valve 62 to increase the gap between the adjustment valve 62 and the valve seat 64.
5 is diverted and enters the valve box 61 from the introduction hole 6T,
Furthermore, valve Jff165. It is sent to the reflux hole 52 via the discharge hole 69. On the other hand, melting wax 25 was adjusted by flow: mci).

Due to stoppage of injection, etc., a part of the molten wax 25 in the passage 30 is diverted and enters the introduction hole 68, and the safety valve 63 is splashed 66 (1): 11
11 pressure to open the valve seat 65, it enters the valve box 61 and is sent to the reflux hole 52 via the discharge hole 69.

FIG. 7 is a 1+ll sectional view showing details of one of the injection devices 36 in FIG. 4(a), where the same reference numerals as in FIG. 4(a) indicate the same parts, 71 is a valve box, and a connecting metal fitting. 37 are screwed together by a threaded portion 72. 73 is an introduction hole for the molten wax 25 provided on the side of the valve box T1, T4 is a valve stem,
75 is a valve, 76 is a valve seat, 1γ is a connecting fitting that is provided with the valve seat 76 and engages with one end of the valve box 71, 78 and 79 are outlet fittings, 8o is a nozzle, 81 is a fitting for the nozzle 8o, 8
2 is a spring that acts in the direction of pressing the MJ sb valve 75 against the valve seat 76, 83 is a packing, 84 is an F cylinder, 85
is a piston fixed integrally with a valve shaft 74 protruding from the other end of the valve box T1.

Next, the operation shown in FIG. 7 will be explained.

The molten wax 25 pressurized by the delivery pump 27 of the wax scoop main body 26 in FIG. Filter 31. After passing through the passage 32 and inside the pipe 33 shown in FIG.
It enters the inside of the valve box 71 through the introduction hole 13 inside.

When the printed circuit board 13 advances and retreats below the injection device 36,
Detection by a detector such as a phototube (not shown) causes pressurized air to flow into the F cylinder 84, causing the piston 85 to operate and press the valve shaft 74 against the pressing force of the spring 82.
5 is released from the valve seat 76. When the valve seat T6 is opened, the melted wax 25 in the valve box T1 is injected from the nozzle 80 through the nozzle fittings 78 and 79, and is sprayed onto the printed circuit board 13.

Note that the nozzle 80 may be directly attached to the valve seat 76 of the connecting fitting 77.

As explained above, the present invention provides an introduction hole in the valve body in the operating direction of the valve stem, engages a connecting fitting provided with a valve seat in the valve body at one end of the valve stem in the operating force direction, and In addition to engaging the nozzle with the valve seat, the valve body is provided with a valve stem having a valve that comes into contact with the valve seat, and the valve stem is protruded to the other end of the valve body to separate the valve from the valve seat. Since the injection device is formed by fixing the spring integrally with the piston of the cylinder and further pressing the valve against the valve seat in the valve box, the molten wax etc. can be automatically injected by the operation of the piston of the F cylinder. Moreover, since the various parts constituting the injection device are assembled by engaging each other, each part can be easily replaced, and maintenance is easy.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional soldering device, Fig. 2 is a partial side sectional view showing how electronic components are mounted on a printed circuit board, and Fig. 3 shows an embodiment of the present invention. Schematic configuration diagram, FIG. 4(a). (b) shows the wax processing section in Fig. 3, Fig. 4 (a) is a partially cutaway perspective view, and Fig. 4 (b) shows the wax processing section in Fig. 4 (a).
FIG. 5 is an enlarged perspective view showing the gear pump exploded, FIG. 6 is an enlarged side sectional view showing details of the control valve, and FIG. 7 shows the main points of the invention. FIG. 3 is an enlarged side sectional view showing details of the injection device. In the figure, 3 is a cutting device, 4 is a processing device for finishing soldering, 8 is a cooler, 9 is a Franks processor, 10 is a preheater, 11 is a solder paste, 13 is a printed circuit board, 14
is an electronic component, 15 is a lead wire (or lead terminal), 1
6 is a through hole, 21 is a soldering device, 22A, 2
2B is a conveyor cheno, 23 is a processing device with wax, 24
25 is a wax processing section, 25 is a melted wax, 26 is a wax body, 27 is a gear pump, 28 is a motor, 29 is a control valve, 30, 32 is a passage, 31 is a filter, 33 is a pipe, 34 is a tape heater, 35 is a heat insulating material, 36 is an injection device, 37 is a connecting fitting, 38 is a thermostat, 39 is a drawer, 4o is a control panel, 41 is a drive shaft, 42 is a driven shaft, 43 is a guide shaft, 44 is a fixture, 45 is Upper case, 46.47
is a spur gear, 48 is a gear case, 49 is a base, 5o is a fixing screw, 51 is a supply hole, 52 is a return hole, 61 is a valve box, 62
is a regulating valve, 63 is a safety valve, 64.65 is a valve seat, 66 is a spring, 67.68 is an introduction hole, 69 is a discharge hole, 71 is a valve box,
72 is a threaded portion, 73 is an introduction hole, T4 is a valve shaft, 15 is a valve,
76 is a valve seat, 80 is a nozzle, 82 is a spring, 84 is an F cylinder, and 85 is a piston. Figures 4 to (b) Figure 5

Claims (1)

[Claims] An introduction hole is provided on the side of the valve box in the operating direction, a connecting fitting having a valve seat is engaged with one end of the valve box, and a nozzle is engaged with the valve seat and the valve box is A valve stem is provided with a valve that comes into contact with the valve seat, and this valve stem is fixed integrally with a piston of an F cylinder that protrudes toward the other end of the valve box and releases the valve from the valve seat. An injection device for a processing device with a wax attachment, characterized in that a spring is installed in the valve box to press the valve against the valve seat.