JPH0150059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frit withstand voltage tester used in the manufacturing process of color cathode ray tubes.

Generally, one of the manufacturing processes for color cathode ray tubes is
There is a frit withstand voltage test process to inspect defective parts of the frit weld. The frit withstand voltage tester used in this process has a frit contact mechanism and an electrode mechanism, and the contact piece of the frit contact mechanism is brought into contact with the frit welded part, and the electrode rod of the electrode mechanism is brought into contact with the cavity. A high voltage is applied between the electrode rod and the contact piece brought into contact with the frit welded portion to conduct a withstand voltage test.

Conventionally, the frit contact mechanism has a structure in which a contact piece that contacts the frit weld part along the entire circumference is provided on the inner surface of an inverted concave contact piece frame that is placed over the outer periphery of the frit weld part of the valve from above. There was a drawback that a number of contact piece frames had to be prepared depending on the variety. In addition, the frit withstand voltage test process includes processes before and after this process, such as applying shocking vibration to the valve in the previous process to remove minute dust and deposits inside the valve, and cleaning the valve neck pipe after this process. This process is automatically carried out using a rotary or linear valve holder intermittent feeding device. However, it was not possible to install the contact frame for each type mentioned above at one station in the frit withstand voltage test process.
The limit was three types at most, and if there were more than that, it would be necessary to add an additional station for the frit withstand voltage test, which would result in equipment problems as the equipment would become larger.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a frit withstand voltage tester that can process various types of valves within the same device.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.
FIG. 1 is a front view showing an embodiment of a frit withstand voltage tester according to the present invention. As shown in the figure,
The flitt withstand voltage tester consists of a valve holder lifting mechanism 10 disposed below a linear conveyor mechanism 2 that conveys a pallet 1, an electrode mechanism 20 disposed diagonally on the side of the conveyor mechanism, and a conveyor The conveyor mechanism 2, the valve holder lifting mechanism 10, and the electrode mechanism 20 are comprised of a frit contact mechanism 30 disposed above the mechanism 2. It has exactly the same structure as No. 76548).

The valve holder lifting mechanism 10 includes a guide roller 12 that moves up and down using a vertical guide rail 11 as a guide.
It has a lifting platform 13 provided with
can be raised by a lift cylinder device 14, and the valve 4 can be raised to a certain height by means of a support rod 15 provided on a lifting table 13 together with a valve holder 3 detachably provided on the pallet 1. ing. Here, the lift cylinder device 14
The structure uses a motor cylinder that can be stopped at any time, and the upward stroke is determined by a signal stored in advance depending on the product type. The electrode mechanism 20 has an electrode rod 21 provided at an angle facing the cavity 5 of the valve 4. The electrode rod 21 is attached to an insulator 22, and the slide base 24 is attached to the pedestal 6 by an air cylinder device 23. A fixed guide rail 25 can protrude as a guide, and an air cylinder 26 provided in the slide base 24 can move the electrode rod 2
1 can be adjusted to accommodate differences in the position of the cavity 5 due to differences in quality.

Next, the frit contact mechanism 30 which is a feature of the present invention
The configuration of is explained below. A main shaft 32 is fixed to the upper surface of the rectangular rotating block 31, and this main shaft 32 is rotatably supported by the pedestal 6 via a bearing 33. A pinion 34 is fixed to the upper end of the main shaft 32, and a rack 36 driven by an air cylinder 35 meshes with the pinion 34. As shown in FIG. 2, slide shafts 37 are fixed to each of the four sides of the rotating block 31, and a slide block 39, which is biased toward the rotating block by a spring 38, is slidably provided on the slide shaft 37. ing. A receiving plate 40 is fixed to the upper surface of the slide block 39.
Air cylinders 41 for actuating the receiving plates 40 on all four sides of the rotating block 31 facing the
is fixed. Also, the slide block 3
An arm 42 is fixed to the lower surface of 9, and this arm 4
A contact roller 43 that contacts the frit welded portion 7 of the valve 4 is rotatably provided inside the tip of the valve 2, as shown in FIG. Here, the air cylinder 41 is always protruding, and the slide block 39 is positioned outward via the receiving plate 40, so that the contact roller 43 is kept away from the valve 4. Further, a pad holder 45 for holding a valve holding pad 44 is fixed to the lower surface of the rotating block 31. The valve holding pad 44 is structured so that it does not rotate even if the rotating block 31 rotates while it is pressed against the upper surface of the valve 4. That is, as shown in FIG. 4, a slide shaft 46 is fixed to the upper surface of the pad 44, and this slide shaft 46 is attached to a holder body 49 fixed to a pad holder 45 via a bearing portion 47 and a radial bearing 48, so that the slide shaft 46 can be moved upwardly and downwardly. It is slidably supported and is constantly biased downward by a spring 50. Further, a slide bearing 51 is provided at the receiving portion of the spring 50, so that the pad 44 can rotate lightly relative to the pad holder 45.

Next, the operation of this tester having such a configuration will be explained. When the valve 4 and the pallet 1 are transferred to the frit withstand voltage test station by the conveyor mechanism 2, the lift cylinder device 14 is operated and the valve 4 is pushed up together with the valve holder 3 by the support rod 15 as shown by the imaginary line. , the upper surface of the valve 4 is pressed against the pad 44. When the valve 4 is stopped, the air cylinder 41 is retracted, and the contact roller 43 comes into contact with the frit welded portion 7 due to the biasing force of the spring 38. At the same time, the insulating member 22 protrudes due to the operation of the air cylinder 23, so that the electrode rod 21 comes into contact with the cavity 5. As a result, a high voltage is applied between the contact roller 43 that is in contact with the frit welded portion 7 and the electrode rod 21, and a withstand voltage test is performed. This withstand voltage test was performed on the frit welded part 7
Rotating block 31 is rotated 90 degrees to test the entire circumference of the test tube. That is, when the air cylinder 35 operates, the pinion 34 is moved by the rack 36.
A main shaft 32 that rotates 90 degrees and is integral with this pinion 34,
The rotating block 31 and slide shaft 37 rotate 90 degrees. Here, even if the rotating block 31 rotates, the pad 44 pressing against the top surface of the valve 4 as described above
On the other hand, the pad holder 45 fixed to the rotating block 31 is designed to be able to rotate lightly, so that the valve 4 remains stationary. Now,
When the slide shaft 37 rotates as described above, the arm 4
2 is a contact roller 43 in a state where it is biased by a spring 38.
The contact roller 43 slides on the slide shaft 37 according to the change in the diameter of the frit welded part 7 that the contact roller 43 contacts.
moves in contact with the frit welded portion 7. In this embodiment, since the contact rollers 43 are provided at 90° intervals, the rotating block 31 is
When rotated through 90°, the entire circumference of the frit weld 7 is tested.

As is clear from the above explanation, according to the frit withstand voltage tester according to the present invention, the contact roller moves along the frit welded part in a press-contact state, so it can be applied to any valve, and the effect is not limited to the product type. has.

In addition, in the above embodiment, the rotating block 3
Although slide shafts 37 are provided on all sides of the valve 1 and the valve 4 is held by contact rollers 43 provided in four directions, the contact rollers 43 may be provided only in one direction and rotated through 360 degrees. However, when provided in two or more directions, contact stability is improved and test time is shortened. Furthermore, although a linear type conveyor mechanism is illustrated, a rotary type can be similarly applied.

Now, in the above-described testing machine of the present invention and conventionally known devices, when the type of valve 4 changes, the valve holder 3 must be replaced with the valve holder 3 that applies to it. That is, conventionally, when holding the valve 4 vertically, a valve holder 3 that matches the sloped part of the funnel part is used, and as shown in FIG. 5, when the sloped part of the funnel part 8 is different, the same valve is used. The holder could not hold the valve stably.

Therefore, next, a new valve holder that does not need to be replaced even if the type of valve 4 changes will be described.

FIG. 6 is a sectional view showing an embodiment of the novel valve holder 50. The valve holder main body 51 has a neck pipe 9 of the valve 4 and a funnel part 8 in the center.
A hole 52 into which a portion of the holder is inserted is provided, and a protruding portion 53 having vertical grooves facing each other is provided on the lower surface. A lever 55 is rotatably provided on a support shaft 54 implanted in the vertical groove of the protrusion 53, and a roller 56 made of resin for holding the neck tube 9 is rotatably attached to one inner end of the lever 55. It is pivoted to. The outer circumferential surface of the roller 56 is formed in an arc shape with a concave center, so that the outer diameter of the neck tube 9 can be held down. Further, a long groove 57 is provided at the other end of the lever 55, and a connecting pin 59 implanted at the lower end of a slide shaft 58 provided on the valve holder main body 51 so as to be movable up and down is fitted into this long groove 57. . A floating plate 61 is fixed to the upper end of the slide shaft 58 and has a receiving surface 60 formed in the center for receiving the funnel portion 8 of the valve 4. This floating plate 61 is attached upward by a spring 62 built into the valve holder body 51. The valve holder main body 51 is always located above and apart from the valve holder main body 51.

When the valve 4 is inserted, the funnel portion 8 of the valve 4 hits the receiving surface 60, the floating plate 61 is lowered by the weight of the valve 4, and the slide shaft 58 is lowered. As a result, the lever 55 rotates about the support shaft 54 via the connecting pin 59, and the two rollers 56 disposed opposite to each other grip the neck tube 9. In this manner, the valve holder 50 holds the outer diameter of the neck tube 9, which has the same dimensions for all types, and one point on the slope of the funnel portion 8, so that any size valve can be held vertically.

It goes without saying that such a valve holder 50 can be applied not only to the above-mentioned frit withstand voltage test process but also to a wide variety of valve manufacturing processes in general.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the frit withstand voltage tester according to the present invention, Fig. 2 is a plan view of the slide block portion, Fig. 3 is a plan view of the contact roller portion, and Fig. 4 is a plan view of the pad holder portion. Enlarged sectional view of 5th
The figure is an explanatory view showing the shape of the valve, and FIG. 6 is a partially cutaway sectional view of the valve holder. 4... Valve, 5... Cavity, 7... Frit welded part, 21... Electrode rod, 30... Frit contact mechanism, 31... Rotating block, 32... Main shaft, 34... Pinion, 35... Air Cylinder,
36...Rack, 37...Slide axis, 38...
Spring, 39...Slide block, 41...Air cylinder, 42...Arm, 43...Contact roller.

Claims (1)

[Claims] 1 A frit withstand voltage test is carried out by applying a high voltage between the frit contact member and the electrode rod, which is equipped with a frit contact member that contacts the frit welded part of the valve and an electrode rod that contacts the cavity of the valve. A voltage testing machine, wherein the frit contacting member is movable along the frit welding part and is biased so as to press against the frit contacting part.