JPS6236550Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for applying a liquid inside a tubular body, such as when applying a phosphor to the inner surface of a glass tube, in a fluorescent lamp manufacturing process.

Conventionally, this type of apparatus coated the glass tube with phosphor while intermittently transporting the glass tube, which caused the problem that high-speed processing was not possible and efficiency could not be improved.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid coating device capable of coating a liquid phosphor while continuously transporting a glass tube.

The present invention provides a tubular body holder that pivots at a constant speed around a vertical axis over at least a predetermined angular range, holds the tubular body in an approximately upright state, and transfers the tubular body at a constant speed; In a liquid coating device comprising a tubular body holder and a plurality of coating heads provided at equal intervals around the periphery of a turntable that rotates at a constant speed and for injecting and coating liquid from the upper part of the tubular body, A liquid tank divided into a plurality of chambers in the circumferential direction is provided at a position above the coating head at the center of rotation, and the divided chambers of the liquid tank and the coating head corresponding to each chamber are connected by pipes. However, the position at which the liquid is supplied to the liquid tank is separated from the position at which liquid application by the application head starts in the circumferential direction of the liquid tank.

In the above configuration, the tubular body is held upright by the tubular body holder and transferred. On the other hand, the liquid supplied into the partitioned chamber of the liquid tank is sent into the coating head via a pipe. A predetermined amount of the liquid sent into the coating head is injected into the tubular body from the coating head while the tubular body is being transported. The liquid tank is divided into a plurality of chambers in the circumferential direction, and the liquid supply into the tank is circumferentially separated from the position where the application head starts injecting the liquid into the tubular body. No liquid is supplied into the chamber of the liquid tank leading to the liquid tank, and liquid containing air bubbles is prevented from flowing into the coating head.

Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, glass tube a is an endless chain b.
The tube holders (hereinafter simply referred to as holders) c, which have a known structure and are mounted at regular intervals, are held in an almost upright state, and are continuously transferred as the chain b moves. The liquid application device 1 of this embodiment is provided above a chain roller, that is, a sprocket d.

In FIGS. 2 to 5, the liquid application device 1
is the vertical main shaft 1 to which sprocket d is attached.
0, the turntable 2 attached above the sprocket d, and the turntable 2
The coating head 4 is attached to the periphery of the holder c at the same intervals as the circumferential intervals of the glass tubes held in the holder c, and the liquid tank 6 is attached to the upper part of the main shaft 10.

A support shaft 21 is vertically movably inserted into bearing holes 20 formed at equal intervals around the periphery of the turntable 2, and a base 22 is fixed to the upper part of the support shaft 21. A guide rod 23 is further fixed upright to the turntable 2 on the inner peripheral side of the bearing hole 20, and the guide rod 23 is inserted into the hole 24 of the base 22 to prevent the base 22 from rotating around the support shaft. It is prevented. A roller 25 is rotatably attached to the lower end of the spindle 21, and the roller 25 engages with the upper part of the cam track 12 provided along the path along which the spindle 21 is moved by the rotation of the turntable. The vertical displacement of the rail allows the support shaft to move up and down.

The coating head 4 includes a mounting plate 40 fixed to the base 22, a cylindrical tank 41 fixed to the lower part of the mounting plate 40, a small diameter nozzle pipe 42 mounted to the lower part of the tank, and the mounting plate 40. The tank 41 is vertically movably inserted into the bearing hole 43 of the tank 41.
and a valve rod 44 extending through the nozzle pipe 42 to its lower end, and a valve body 45 attached to the lower end of the valve rod 44 and capable of engaging with the lower end of the nozzle pipe 42, and having a mounting plate. It is supported by the base 22 via the base 22.

A spring receiver 46 fixed to the valve stem 44 is constantly pressed upward by a spring 47, whereby the valve body 45 is biased to engage with the lower end of the nozzle pipe 42, and normally closes the lower end of the nozzle pipe. ing.

A bracket 50 is attached to the mounting plate 40, and a camshaft 51 is rotatably attached to the bracket 50. A cam 52 that engages with the upper end of the valve stem 44 to press the valve stem is fixed to one end of the camshaft 51, and an operating lever 53 is fixed to the other end. A roller 54 is rotatably attached to the operating lever 50, and the roller engages with a cam track 13 provided on a circumference centered on the axis of the main shaft. Therefore, the operating lever 53 rotates due to the vertical displacement of the cam track, and the cam 52 rotates.
Thereby, the valve rod 44 is pressed to control opening and closing of the lower end of the nozzle pipe.

An overflow tube 48 is provided on the side of the tank 41, through which excess phosphor 1 flows into an annular trough 14 provided around the turntable.

A gutter 15 is also provided below the passage of the glass tube to receive excess phosphor injected into the glass tube.

The liquid tank 6 is formed by an annular main body 60, and is partitioned into a plurality of chambers 62 by a plurality of radial partition plates 61 spaced apart at equal intervals in the circumferential direction. In this embodiment, the number of chambers 62 is the same as the number of coating heads, but may be a multiple of that number. Inside of tank 41 of each coating head 4 and liquid tank 6
The bottom of each chamber 62 is connected by a pipe 65, respectively, so that the liquid in the chamber 62, that is, the fluorescent substance can flow into the tank 41.

In this case, the diameter of the hole 63 in the lower part of the liquid tank 60 is reduced so that the phosphor 1 in the tank does not flow into the tank 41 of the coating head 40 at any one time. That is, through the hole 63 the tank 6
The flow rate of phosphor from each chamber of 0 into the tank of the corresponding coating head is approximately equal to or slightly greater than the amount required for one coating during one rotation of the turntable.

The position of the supply pipe 7 for supplying the phosphor into the tank 60 is preferably above a chamber at a position diametrically opposite to the chamber connected to the head where coating begins (for example, at a position opposite to position A). When the phosphor 1 is supplied into the tank 60, air bubbles are mixed into the phosphor, but the phosphor containing such air bubbles is prevented from being sent to the coating head as much as possible. .

In the liquid coating device having the above configuration, the liquid tank 6
Each chamber 62 of 0 is supplied with liquid phosphor 1 as it passes under the supply pipe 7, and from that chamber 62 it is gradually supplied via a conduit into the tank 41 of the respective application head 4.

When the glass tube held in the holder of the chain reaches position A, it begins to descend by the action of the cam track 12, and when it reaches position C, the lower end of the nozzle pipe 42 of the coating head 4 is moved as shown in FIG. 6 [C]. At the same time, the operation lever 53 is rotated by the action of the cam track 13, the valve stem 44 is pushed down, and the valve body 45 is separated from the lower end of the nozzle tube 42, causing the fireflies to enter the glass tube. Start applying the light body. When position D is reached, the valve stem 44 rises and the valve body 45 engages with the lower end of the nozzle, stopping coating and the coating head 4 begins to rise until reaching position F, as shown in FIG. ] Return to the state shown in
At this position, the holder is separated from sprocket d together with the chain and sent to the next process.

According to the present invention, since it is possible to prevent liquid mixed with air bubbles from flowing into the coating head, even when coating a phosphor inside a glass tube, it is possible to connect the tubes and perform the coating at high speed and stably.

[Brief explanation of the drawing]

FIG. 1 is a schematic top view showing the relationship between the liquid applicator and chain according to the present invention, FIG. 2 is a partial side sectional view of the liquid applicator according to the present invention, FIG. 3 is a sectional view of the coating head, and FIG. 4 is a view taken along the arrow - in Figure 2, Figure 5 is a top view of the liquid tank, and Figure 6 is a top view of the liquid tank.
The figure shows the coating operation by the coating head. 1: Liquid applicator, 2: Turntable, 4:
Application head, 6: Liquid tank.

Claims (1)

[Scope of utility model registration request] A tube holder that rotates at a constant speed about a vertical axis over at least a predetermined angular range, holds the tubular body in a substantially upright state, and transfers the tube at a constant speed; In a liquid coating device equipped with a plurality of coating heads that are provided at equal intervals around the periphery of a turntable that rotates at a constant speed and that inject and coat liquid from the upper part of the tubular body, the rotation center of the turntable is A liquid tank divided into a plurality of chambers in the circumferential direction is provided at a position above the coating head, and the divided chambers of the liquid tank are connected to the coating head corresponding to each chamber with a pipe. A liquid coating device characterized in that a position where liquid is supplied to the liquid tank is separated from a position where liquid application by the coating head starts in the circumferential direction of the liquid tank.