JPS5910361A - Coating device of coating liquid on inside surface of tubular bulb - Google Patents

Abstract

PURPOSE:To make a coating amt. and a coating position uniform and to improve working efficiency, by automating the operation for coating liquid on the inside surface of a tubular bulb. CONSTITUTION:A rotary disc 10a transfers a valve 3 succesively intermittently in an arrow E direction, and rotates the bulb 3 in an arrow F direction within the time when it is positioned in a groove part 13. A coating bar 27 is inserted through the through-hole of a guide plate into the bulb 3 from the opening at one end thereof by the effect of an air cylinder in one groove part 13 in the stage of such rotation, and the sticking part 29 thereof is brought down into the direction I intersecting orthogonally with the axial direction of the bulb 3. Then, the part 29 contacts with the inside wall surface of the bulb 3, and the coating liquid stuck on the part 29 is coated over the entire circumferential surface on the inside circumferential surface of the bulb 3 as the bulb 3 rotates. When the part 29 is detached from the inside surface of the bulb and is retreated by the backward operation of the air cylinder, the valve 3 is transferred to the next stage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for applying a coating liquid to the inner surface of a lighting tube, such as for applying a getter liquid to the inner surface of a lighting tube.

[Technical background of the invention and its problems]

Normally, in a 100cm class lighting tube, an emitter (electron radioactive substance) such as barium (Ba) is coated on the electrodes to lower the discharge starting voltage. Barium is originally applied to electrodes for the purpose of emitter action, but
A portion of this barium scatters onto the inner surface of the tube wall during the aging process of the lighting tube, adsorbs impurities within the tube, produces a so-called getter action, and contributes to stabilizing the characteristics.

゛ On the other hand, in the case of 200-class lighting tubes, their characteristics are influenced by the gas filled in them, and the volume inside the tube is large. is insufficient, leading to deterioration of characteristics due to shadows behind impurities.

For this reason, in a 200V class lighting tube, barium nitride (BaN6) Ift is applied to the inside of the tube separately from the emitter, the barium nitride is thermally decomposed to precipitate metallic barium, and this metallic barium is used to perform the getter action. has been adopted.

However, in the past, applying nitriding and diluting materials to the inner surface of lighting tube bulbs had to be done manually.

Not only was the work efficiency low, but the coating amount and position varied, resulting in unstable quality.

[Purpose of the invention]

The present invention is based on these circumstances. The object of the present invention is to provide a coating device that automates the work of applying a coating liquid to the inner surface of a tube, makes it possible to equalize the amount of application and the application position, and improves the efficiency of the application work.

[Summary of the invention]

In the present invention, a tube valve is rotated at an axis rotation angle p, a coating liquid is applied from a coating liquid supply device to an attachment portion formed at the tip of a coating rod outside the valve, and the coating rod is driven by a reciprocating drive device. The attached portion is moved into the valve by moving it in the axial direction of the valve, and in this state, the valve and the reciprocating drive device are relatively displaced in a direction perpendicular to the entire valve axis by a moving mechanism. Accordingly, the above-mentioned attachment portion is brought into contact with the inner surface of the rotating valve, and the coating liquid in the attachment portion is applied to the inner surface of the valve.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a base, and the base 1 has a pair of guide plates 2a that are parallel to each other.

2b is erected. These guide plates 2h,
The spacing between the guide plates 2b corresponds to the axial dimension of the lighting tube bulb 3, and the guide plates 2a.

2b, the valve 3 can be slidably guided in a horizontal position.

A plurality of shafts 4 are passed through the other guide plate 2b. These shafts 4... are arranged side by side in a horizontal plane, and bearings 5... are located inside and outside the guide plate Jb, respectively.

6b... is pivotally supported. At the outer end of each shaft 4, a chain slit and a trolley are attached. These chain sprockets 6...
One chain 7 is commonly passed between the racks. Then any one axis, for example feed direction & end fillQ
A driven sprocket 8 is attached to the shaft 4, and a chain 9 is installed between the driven sprocket 8 and a driving sprocket of a motor (not shown).

Due to the rotation of the constant speed rotation motor, the driven sprocket 8 is rotated at a constant speed in the direction of the arrow. Therefore, since each chain 7 runs at a constant speed in the direction of arrow B, all chain sprockets 6 are rotated in the direction of arrow C in synchronization with each other. tb, all the shafts 4... are rotated simultaneously in the direction of arrow C at the same speed.

A pair of rotating disks 5-10, 10b, . . . is attached to each of the shafts 4, . These pair of rotating disks 10m, 10b are arranged on both sides of the bearing 5a, one rotating disk 10a is close to the inner surface of the other guide plate 2m, and the other rotating disk 21) is close to the inner surface of the other guide plate 21). It is located close to the inner surface of the guide plate 2b. These pair of rotating disks 10m, 10b
For example, triangular notches jla are located at the same angle of rotation.

11b (11b is not shown) is provided.

Also, a rotating disk IQa between mutually adjacent shafts 4.

As shown in FIG. 4, 10a, 10, b, and 10b are arranged so that their portions overlap each other.

The bulb 3 of the lighting tube is fed through the input chute 12 shown in Figure I@1 while being transferred or slid in the direction of the arrow. The valve 3 located at the lowest end of the input chute 12 has a rotating disc of 10 m and a notch of 11 m in 10b.
+ 1 l When b comes, these notches 11h, Il
b, and is sent in the direction of arrow E as the rotating disks 10a and 10b rotate -6 = rotation.

Rotating disk 10m, 10tr with valve 3 adjacent to it.

When reaching the overlapping part of 10b and 10b, the valve 3 connects these rotating disks J Oa, J Oa +10b
, 10b.

Since the rotating disks JO&..., 10b... are rotated at a constant speed, the valves 3 in the grooves 13...
By sliding in contact with the rotating disk, it is rotated in the direction of arrow F -\.

During the surface rotation, the rotating disk J O on the rear side in the feed p direction
a, J (When the notches IJa and llb of lb start to rotate, the rotating valve becomes the notch 11&.

Depressed to 11b and next #lI! Transferred towards s13.

That is, the rotating disks 10 & 11 configured as described above.
0b... At the same time, the pulp S is intermittently transferred in the direction of the arrow E, and the valve 3 is rotated in the direction of the arrow F during the time it is located in the groove 13... and around the valve axis. This not only corresponds to the rotation mechanism of the present invention, but also has a transfer function.

Note that when the valve 3 is moved in the direction of the arrow E and when it is rotating in the direction of the arrow F, the guide plays 2a and 2b guide the valve 3 so that it does not move in the axial direction.

Further, the valves 3 sent by each rotary disk are sent out in the direction of arrow G from the rear end in the feeding direction by an outgoing chute 14.

A through hole 15 is formed in one guide plate 2 a so as to face a predetermined groove 13 . This through hole 15 is located within the predetermined groove 13' and opens on the valve shaft of the Tahalb 3, into which an applicator rod to be described later can be inserted and removed.

A support stand 20 is attached to the base 1 so as to be located outside one of the guide plates 2a.

A first air cylinder 21 is fixed to the lower surface of the support base 20, and a piston rod 22 of the air cylinder 2 extends upward from the support base 20. Also, the support stand 20
A guide rod 23° 23 is erected on the holder, and an adjuster 24 is threaded through the guide rod 23 23 . A lifting platform 25 is fixed to the upper end of the piston rod 22.
, this elevating table 25 is moved up and down by the operation of the first air cylinder 21. The guide rods 23, 23 serve as guides when the lifting table 25 is moved up and down, and the adjusting port 24 regulates the lifting stroke of the lifting table 25. Note that this more flexible Jj+ lowering mechanism is a compliment to the moving mechanism of the present invention.

A second air cylinder 26 is fixed to the lifting platform 25. The air cylinder 26 is installed horizontally, and a coating rod 28 is removably attached to the tip of a piston rod 27. The applicator rod 28 has an attachment part 29 on the outer circumferential surface of the tip thereof, which is formed by wrapping an impregnated material such as thread, cloth, or sponge, or by a brush or the like.

When the second air cylinder 26 is operated, the application rod 28 is reciprocated in the horizontal direction, and when advanced, it is inserted into the pulp 3 through the 9-through hole 15 formed in the one guide plate 2&. It looks like this. Therefore, the second air cylinder 26 corresponds to the reciprocating drive device of the present invention.

The applicator rod 28 is attached to the piston rod 27 via a set screw 28af, so the applicator rod 28 can be removed and replaced. The dimensions can also be adjusted.

A coating liquid storage container 3θ is located directly below the attachment portion 29 when the coating rod 28 is retracted by the operation of the second air cylinder 26. The coating liquid 31 may be, for example, imaged barium (BaN6), and the container 30 is attached to an electromagnetic stirring device 32, such as a magnetic stirrer (trade name), to stir the coating liquid 31. A coating liquid supply plate 33 is removably immersed in the coating liquid 31. The supply plate 33 is, for example, a simple square piece, and is mounted horizontally via a support rod 34. The support rod 34 is fixed to an elevating plate 35, and is moved up and down by a third air cylinder 36. The third air cylinder 36 is attached to a mounting base 37 erected from the base IVC 9, and a piston rod 38 of this air cylinder 36 is connected to the elevating plate 35.

Therefore, when the elevating plate 35 is lowered by the operation of the third air cylinder 36, the supply plate 33
When the supply plate 33 is immersed in the coating liquid in 0 and the lifting grate 35 is raised, the supply plate 33 is lifted out of the coating liquid 31 and comes into contact with the adhesion part: j9 waiting directly above. When the supply plate 33 is lifted from the coating plate 31, the coating liquid 3 is skimmed onto the upper surface of the supply plate S3 by drying due to its viscosity, and this supply plate 33 comes into contact with the above-mentioned adhering portion 29. Then, the coating 1eL81 stored on the upper surface is applied to the adhesion portion 2g.

Therefore, the supply route 33 corresponds to the coating liquid supply device of the present invention.

According to this example of Hiko configuration, the guide rule-) 2a
, 2b, within the groove 13 between the rotating disks, arrow F
When the second air cylinder 26 is actuated to advance the applicator rod 27 in the direction of arrow H while the valve 3 is being rotated in the direction shown in FIG. It is inserted from. In this state, the first air cylinder 21 is operated to lower the elevator platform 25 in the direction of arrow 1. Then, the second air cylinder 26 and the application rod 2
7 are lowered together, the attachment portion 29 is lowered, that is, moved relative to the valve 3 in a direction perpendicular to the axial direction, so the attachment portion 29 comes into contact with the inner wall surface of the bulb 3.

Therefore, the coating liquid 31 attached to the attachment portion 29 is applied to the inner wall surface of the valve 3.

At this time, since the valve 3 is rotating in the direction of arrow F, the coating liquid 31 is applied to the entire circumference of the inner peripheral surface of the valve 3 in the circumferential direction.

When the coating liquid 31 is applied to the inner wall surface of the valve 3, the first air cylinder 21 operates in the opposite direction to the direction of the arrow (■) to separate the attachment portion 29 from the inner surface of the valve 3 and return it to the axis of the valve 3. The second air cylinder 26 operates in the direction opposite to the direction of the arrow H to move the application rod 28 backward, and the attachment portion 29 is removed from the valve 3 through the through hole 16 to the outside. When the adhesion section 29 is stopped at a predetermined retreat position, the coating liquid supply plate 33 is raised, and the application liquid 31 stored on this plate 33 is supplied to the adhesion section 29 in preparation for the next application. .

For valve 3, rotating disk J (Ja) is used.

The notches 11m and Ilb of the valve 10b allow the valve to be fed out from the groove 13 at the above-mentioned dispensing position in the direction of the arrow E, and the next bulb 3 is fed into this groove 13.

According to the apparatus of this embodiment, the work of applying the coating liquid to the valve is automatically performed, so that the work efficiency is extremely improved. Moreover, valve S is a guide loop) 2 a + J
While the axial position is regulated by b,
The reciprocating stroke of applicator rod J# is controlled by the second air cylinder 2.
6, the position at which the adhering portion 29 enters the pulp S remains constant. Therefore, the application position relative to the valve 313- is constant and there is no variation in the application location. Also, the supply plate 33
supplies a fixed amount of the coating liquid 31, so this adhesion portion 29 also applies a predetermined amount of coating to the valve 3. Therefore, there is no variation in the amount of application in the valve 3.

Note that the present invention is not limited to a getter liquid coating device for lighting tubes, but can be applied as a means for applying a predetermined coating liquid to other tubes.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to automate the work of applying a coating liquid to the inner surface of a tube valve, thereby improving work efficiency. There are advantages such as eliminating the problem and stabilizing the quality.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view showing the entire apparatus for applying getter liquid to a lighting tube, Fig. 2 is a plan view of the main parts, and Fig. 3 is Fig. 2. - A cross-sectional view taken along the line ■--■, Figure 4 is a diagram explaining the operation of the rotating disk, and Figure 5 is a diagram explaining the coating operation. 2. 2b...Guide grade, 3...Valve, 1
0m, 10b...Rotating disk (rotating mechanism), 11mrl
lb... Notch, 21... First air cylinder (moving mechanism), 25... Lifting platform (moving mechanism), 26... Second air cylinder (reciprocating mechanism), 28... applicator stick,
29... Adhesion part, 30... Container, Sl... Coating liquid, 33... Supply plate (coating liquid supply device), 36...
...Third air cylinder (coating liquid supply device).

Claims (1)

[Claims] a mechanism for rotating a tube valve having an open end in rotations of an axis; a reciprocating drive device provided on the axis of the valve and reciprocating in the axial direction of the valve; and a mechanism attached to the reciprocating drive device. A coating rod having a coating liquid attachment portion at its tip portion, the upper attachment portion of which is removably inserted into the valve from the open end by the operation of the reciprocating drive device, and the coating rod is pulled out from the valve. a coating liquid supply mechanism that holds the coating liquid in the adhesion part in a state in which the application liquid is held in the adhesion part, and a reciprocating drive device that moves the valve and the reciprocating drive device relative to each other in a direction perpendicular to the valve axis in a state in which the adhesion part is inserted into the valve. 1. An apparatus for applying a coating liquid to the inner surface of a tube, comprising a moving mechanism that brings the upper attachment part into contact with the inner surface of the bulb by moving the upper part.