JPH11339661A - Electron gun sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of cracks at the sealing position of a bulb neck by forming a heating means heating the bulb neck section of a glass bulb movably together with a sealing head. SOLUTION: Sealing heads 13 are provided at multiple positions of the turntable 12 of an intermittent drive unit 11, and the sealing heads 13 are moved to various positions in sequence. A glass bulb and an electron gun are fed to the sealing head 13 at the feeding position P1, and the bulb neck section of the glass bulb is preheated by the heating device of the sealing head 13 at preheating positions P2-P4. The stem section of the electron gun is welded and sealed to the bulb neck section by a welding device 15 at the welding position P5, and the bulb neck section is gradually cooled by the heating device of the sealing head 13 at annealing positions P6-P8. The glass bulb is taken out at the discharging position P9. The bulb neck section is gradually heated and gradually cooled, and the occurrence of thermal strain is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electron gun sealing device used in a cathode ray tube manufacturing process.

[0002]

2. Description of the Related Art Conventionally, in a manufacturing process of a cathode ray tube, an electron gun sealing device for welding and sealing a stem portion of an electron gun to a bulb neck portion of a glass bulb is sealed at each of a plurality of positions of a turntable of an intermittent driving device. Each sealing head is equipped with a glass head and an electron gun supply position, a plurality of adjacent preheating positions, a welding position, a plurality of adjacent slow cooling positions, a welded glass valve and an electron gun. It is positioned intermittently in the discharge position. In the conventional electron gun sealing device, a heating device for heating the bulb neck portion of the glass bulb is fixedly disposed at each of the preheating positions.

[0003]

However, in the prior art, the sealing head for supplying and holding the glass bulb and the electron gun is held by the sealing head while moving from one preheating position to the next preheating position. The bulb neck of the glass bulb is out of the heating range by the heating device,
Becomes non-heated. For this reason, while moving to the next preheating position, the bulb neck of the glass bulb is deprived of heat by the atmosphere and cooled. Therefore, heating and cooling are repeated until the bulb neck portion of the glass bulb passes through a plurality of preheating positions and is heated to a predetermined preheating temperature. As a result, thermal distortion occurs at the heating position of the bulb neck portion. However, there is a problem that the thermal strain causes a crack at the sealing position of the valve neck portion cooled after sealing.

[0004] It is an object of the present invention to prevent cracks from occurring at the sealing position of a valve neck in an electron gun sealing device.

[0005]

According to the first aspect of the present invention, after a sealing head supplied with a glass bulb and an electron gun is passed through a preheating zone for preheating a bulb neck of the glass bulb, In an electron gun sealing device, a stem portion of an electron gun is welded and sealed to a bulb neck portion of a glass bulb, and then a gradual cooling region for gradually cooling the bulb neck portion of the glass bulb is used. Is configured to be moved together with the sealing head.

According to a second aspect of the present invention, there is provided a temperature control means for controlling the heating temperature so that the heating temperature of the heating means becomes higher in the preheating area as it approaches the welding area. It was made.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the heating means is further provided in a sealing head.

The present invention described in claim 4 is the first to third aspects of the present invention.
In the present invention according to any one of the above, the heating means further includes a heating section surrounding a bulb neck portion of the glass bulb,
This heating section is made openable and closable.

[0009]

According to the first aspect of the present invention, the following operations are provided. Since the valve neck is preheated using the heating means that moves together with the sealing head, the valve neck can be preheated with a temperature gradient that gradually becomes higher without repeating heating and cooling. Generation of thermal strain at the welding position can be prevented. As a result, generation of cracks at the sealing position of the valve neck portion cooled after sealing can be prevented, and the quality of the product can be improved.

[0010] Since the heating means moves together with the sealing head, the temperature of the valve neck does not decrease in the process of preheating the valve neck. For this reason, the heating time to the target temperature can be shortened as compared with the related art,
The sealing cycle time can be shortened and the production efficiency can be improved.

According to the second aspect of the present invention, the following operations are provided. Since the heating temperature by the heating means is controlled so as to gradually increase as it approaches the welding zone in the preheating zone,
The valve neck can be heated to a target temperature with a gentle temperature gradient that gradually increases in temperature at a fixed rate. Therefore, it is possible to prevent the occurrence of thermal strain at the heating position of the valve neck.

According to the third aspect of the present invention, the following operations are provided. Since the heating means is provided in the sealing head, the assembling operation of the sealing device can be easily performed. That is, before assembling the sealing head to the moving device (turntable), the mounting position of the heating means with respect to the sealing head can be adjusted in a place having good workability. It can be incorporated into the device, and assembly work can be performed easily and well.

According to the present invention, the following effects are obtained. Since the heating part (nozzle body) of the heating means is configured to open and close in the horizontal direction, even when the glass bulb is moved from the horizontal direction during supply and discharge of the glass bulb to and from the sealing head, the bulb neck is connected to the heating part. The operation of supplying and discharging the glass bulb can be performed easily and well without interference.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the overall configuration of an electron gun sealing device, FIG. 2 is a schematic diagram showing a sealing head, and FIG. 3 is a schematic diagram showing a sealing positional relationship between a glass bulb and an electron gun. FIG. 4 is a schematic diagram illustrating a heating device, FIG. 5 is a schematic diagram illustrating a temperature control device of the heating device, and FIG. 6 is a schematic diagram illustrating a heating unit of the heating device.

(Overall Configuration) (FIG. 1) As shown in FIG. 1, the electron gun sealing device 10 includes sealing heads 13 at a plurality of positions of a turntable 12 of an intermittent driving device 11, and each sealing head 13 13 sequentially feed position P ₁ of the glass bulb 1 and the electron gun 2, a plurality of Aitonaru preheating position P ₂ to P ₄ (preheating zone), welding position P ₅ (welding zone), a plurality of Aitonaru slow cooling Positions P _{6 to} P
₈ (Johiyaiki), moves so as intermittently position the discharge position P ₉ of the welded glass bulb 1 and the electron gun 2. At the supply position P ₁ , the glass bulb 1 and the electron gun 2 are supplied to the sealing head 13. Preheating position P ₂
In P _4, the heating device 14 of the sealing head 13, to preheat the bulb neck portion 1A of the glass bulb 1. In the welding position P _5, the welding device 15, the glass bulb 1
The stem 2A of the electron gun 2 is welded and sealed to the valve neck 1A. At the slow cooling positions P _{6 to} P ₈ , the heating device 14 of the sealing head 13 gradually cools the bulb neck portion 1A of the glass bulb 1. At the discharge position P ₉ , the glass bulb 1 to which the electron gun 2 is welded is discharged from the sealing head 13.

Hereinafter, the sealing head 13 and its heating device 14
Will be described. (Sealing Head 13) (FIGS. 2 and 3) As shown in FIG.
2, a glass holder 1 supplied by a supply device (not shown) is placed on the bulb holder 21, and then the bulb holder 2 is mounted.
The glass bulb 1 is positioned and held by a centering device (not shown) provided in the glass bulb 1.

The sealing head 13 is provided with an electron gun holding device 23 provided on a column 22 connected to the lower surface of the valve holder 21.
Support the electron gun 2 supplied by a supply device (not shown). In the electron gun holding device 23, a mount pin support 26 is connected to a linear guide 25 provided on the outer surface of the column 22, and the support 26 can be moved up and down along the linear guide 25 by an air cylinder 27. The lift air cylinder 27 has a lock mechanism for locking the piston rod at an arbitrary position. 28 is a stopper. In the electron gun holding device 23, a mount pin 24 is rotatable by a stepping motor 29 mounted on a mount pin support 26 via a drive pulley 31, a timing belt 32, and a driven pulley 33. Accordingly, when the position shift amount of the electron gun 2 supported by the mount pins 24 in the rotation direction with respect to the glass bulb 1 is detected by a known position detecting device, the position shift in the rotation direction is corrected by the motor 29. Further, the mount pin support 26 is raised by the lifting air cylinder 27, the electron gun 2 supported by the mount pin 24 is inserted into the bulb neck 1A of the glass bulb 1, and the stem 2A of the electron gun 2 is connected to the glass bulb. In a state in which it is positioned at a predetermined height position with respect to the valve neck portion 1A (FIG. 3),
The mount pin support 26 is locked by the piston rod lock mechanism of the air cylinder 27. The lowering of the mount pin support 26 is performed by releasing the lock mechanism of the lifting / lowering air cylinder 27 and controlling the air pressure applied to the lifting / lowering air cylinder 27.

(Heating Device 14) (FIGS. 4 to 6) The sealing head 13 includes a heating device 14 as shown in FIG. As shown in FIGS. 3 and 4, the heating device 14 includes support shafts 41 at portions of the bracket 22A fixed to the support 22 on both sides of the support 22, and each of the support shafts 41 has a rectangular cylindrical heating head 42A. , 42B. The heating device 14 swingably supports the upper and lower open / close air cylinders 43A and 43B at two upper and lower positions on the center rear surface of the bracket 22A, and connects the piston rod of the open / close air cylinder 43A to the base end side of the heating head 42A. And the piston rod of the open / close air cylinder 43B is pivotally connected to the base end side of the heating head 42B, and the heating head 42 is operated by the operation of the open / close air cylinders 43A and 43B.
A and 42B can be opened and closed with respect to each other as shown by a two-dot chain line in FIG. As shown in FIG. 5, the heating device 13 has a high-pressure air inlet 44 at the base end of the heating heads 42A and 42B.
Are connected, and an electric heater 46 is built in a heating chamber 45 of the heating heads 42A and 42B.
A heating nozzle 47 (heating unit) is provided at the tip of B.
The heating nozzle 47 is, as shown in FIG.
A has a number of nozzle holes 47B. That is, when the heating device 14 sets (a) the heating heads 42A and 42B to the closed position by the closing operation of the open / close air cylinders 43A and 43B, the heating nozzles 47 of the heating heads 42A and 42B are united to form the concave portions 47A thereof. Inside the bulb neck portion 1A of the glass bulb 1, the high-pressure air supplied to the heating chamber 45 is heated by the electric heater 46, and hot air generated from the nozzle hole 47B of the heating nozzle 47 is blown into the glass neck portion 1A. (B) Open / close air cylinder 43
When the heating heads 42A, 42B are set to the open position by the opening operation of A, 43B, the heating nozzles 47 of the heating heads 42A, 42B can be opened to each other.

Further, the heating device 14 includes a sealing control device 51.
And a temperature control device 52 controlled by The temperature control device 52 controls the heating chamber 4 of the heating heads 42A and 42B.
5 to obtain a detection result of the temperature sensor 53 provided, by controlling the energization current to the electric heater 46, (1) the heating temperature (blowoff warm air temperature) is welded position in preheating position P ₂ to P ₄ P as well as the heating temperature controlled to a high temperature as it approaches the _5, (2) the heating temperature as the heating temperature (blowoff warm air temperature) becomes low with increasing distance from the welding position P ₅ in slow cooling position P ₆ to P ₈ Controllable.

The sealing operation by the electron gun sealing device 10 is performed as follows. (1) at a feed position P _1, the glass bulb 1 is placed on the valve holder 21, is positioned and held. In addition, electron gun 2
Is supported on the mount pin 24 of the electron gun holding device 23, the displacement of the electron gun 2 with respect to the glass bulb 1 is corrected by the stepping motor 29, and the stem 2 A of the electron gun 2 is moved by the elevating air cylinder 27 to the glass bulb 1. It is positioned at a predetermined welding position with respect to the valve neck 1A.
After positioning the glass bulb 1 and the electron gun 2, the heating device 14
Heating head 4 by the open / close air cylinders 43A and 43B.
2A, 42B are set to the closed position, and the heating heads 42A,
The heating nozzle 47 of 42B is united and surrounds the bulb neck 1A of the glass bulb 1.

(2) At the preheating positions P _{2 to} P ₄ , the temperature control device 52 controls the heating heads 42 A,
2B, the high-pressure air supplied from the high-pressure air inlet 44 is heated to a suitable temperature, and the high-pressure air is supplied from the nozzle hole 47B of the heating nozzle 47 to the valve neck of the glass bulb 1. 1A, and heats the valve neck 1A. At this time, the temperature of the hot air is adjusted under the control of the temperature control device 52 so that the temperature at the welding position of the valve neck 1A has a temperature gradient that increases at a constant rate.

[0022] (3) in the welding position P _5, a heating device 14
Heating head 4 by the open / close air cylinders 43A and 43B.
2A, 42B are set to the open position, and the heating heads 42A,
The heating nozzle 47 of the welding device 42B is opened, the welding burner of the welding device 15 enters the space therebetween, and the welding position of the valve neck portion 1A is heated to a predetermined welding temperature to thereby heat the valve neck portion 1A.
A and the stem 2A are welded. After this welding, the heating heads 42A and 42B are set to the closed position by the open / close air cylinders 43A and 43B of the heating device 14, and the heating head 42
A and 42B of the heating nozzle 47 are united to surround the bulb neck 1A of the glass bulb 1.

(4) At the slow cooling positions P _{6 to} P ₈ , the heating heads 42 A, 4
2B, the high-pressure air supplied from the high-pressure air inlet 44 is heated to a suitable temperature, and the high-pressure air is supplied from the nozzle hole 47B of the heating nozzle 47 to the valve neck of the glass bulb 1. 1A, and the valve neck 1A is gradually cooled. At this time, the temperature of the hot air is adjusted by the control of the temperature control device 52 so that the temperature at the welding position of the valve neck portion 1A has a temperature gradient falling at a constant rate.

[0024] (5) at the discharge position P _9, the heating device 14
Heating head 4 by the open / close air cylinders 43A and 43B.
2A, 42B are set to the open position, and the heating heads 42A,
The heating nozzle 47 of 42B is opened, and the glass bulb 1 in which the electron gun 2 is welded and sealed is taken out.

Therefore, according to the present embodiment, the following operations are provided. Since the valve neck portion 1A is preheated by using the heating device 14 that moves together with the sealing head 13, the valve neck portion 1A can be preheated with a temperature gradient that gradually becomes high without repeating heating and cooling. The occurrence of thermal strain at the welding position of the valve neck 1A can be prevented. As a result, cracks can be prevented from occurring at the sealing position of the valve neck portion 1A cooled after sealing, and the quality of the product can be improved.

Since the heating device 14 moves together with the sealing head 13, the temperature of the valve neck 1A does not decrease during the preheating process of the valve neck 1A.
For this reason, the heating time to the target temperature can be shortened as compared with the conventional case, the sealing cycle time can be shortened, and the production efficiency can be improved.

In the conventional apparatus, if an abnormal stop occurs for some reason during the intermittent rotation of the turntable 12,
At the slow cooling positions P _{6 to} P ₈ , the glass bulb 1 during slow cooling stops at a position deviated from the heating position by the heating device, is deprived of heat by the atmosphere and is rapidly cooled, and as a result, cracks also occur in the valve neck 1A. However, according to the present embodiment, even if the turntable 12 is stopped during rotation, heating for slow cooling by the heating device 14 can be continued, and cracking of the valve neck portion 1A due to slow cooling failure is prevented. it can.

Since the heating temperature of the heating device 14 is controlled so as to gradually increase in the preheating region as it approaches the welding region, the temperature of the valve neck 1A is gradually increased at a constant rate with a gentle temperature gradient. It can be heated to the target temperature. Therefore, it is possible to prevent the occurrence of thermal strain at the heating position of the valve neck 1A.

Since the heating device 14 is provided in the sealing head 13, the assembling operation of the sealing device 10 can be easily performed. That is, before assembling the sealing head 13 to the turntable 12, the mounting positional relationship of the heating device 14 with respect to the sealing head 13 can be adjusted in a place with good workability. It can be incorporated into the turntable 12, and the assembling work can be performed easily and well. That is, when heating the valve neck 1A, it is necessary to adjust the horizontal relative positional relationship between the valve holder 21 and the heating nozzle 47 so that the axis of the valve neck 1A coincides with the axis of the heating nozzle 47. However, for example, the heating device 1
If the seal 4 is provided on the turntable 12 separate from the sealing head 13, this adjustment becomes very difficult. First, the sealing head 13 is attached to the turntable 12, and then the heating device 1 is attached to the turntable 12.
Assuming that the heating device 14 is to be mounted, the mounting of the heating device 14 involves a task of adjusting and fixing the position while checking the relative positional relationship between the two while the worker is sunk under the turntable 12 with poor workability. Because it is forced.

Since the heating nozzle 47 of the heating device 14 is opened and closed in the horizontal direction, the glass neck 1 can be moved from the horizontal direction when the glass bulb 1 is supplied to and discharged from the sealing head 13 even when the glass neck 1 is moved from the horizontal direction. 1A does not interfere with the heating nozzle 47, and the supply and discharge of the glass bulb 1 can be performed easily and satisfactorily.

The heating device 14 does not necessarily have to be provided in the sealing head 13. For example, turntable 12
Heating device 14 is attached to the moving means that moves in synchronization with the intermittent rotation of
And the heating device 14 may be moved together with the movement of the sealing head 13.

The heating temperature of the nozzle neck 1A by the heating device 14 controlled by the temperature control device 52 is as follows:
Heating control (preheating zone) or cooling control (slow cooling zone) with stepwise temperature gradient of three steps in preheating zone or slow cooling zone
The temperature rise control or the temperature decrease control may be performed by a proportional linear temperature gradient.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, in the embodiment of the present invention, the moving device of the sealing head is not limited to the intermittent rotating device, but may be an intermittent linear moving device, a continuous rotating device, a continuous linear moving device, or the like. Further, in the practice of the present invention, some work processing area is provided between the supply position and the preheating area, between the preheating area and the welding area, between the welding area and the slow cooling area, and between the slow cooling area and the discharge position. It may be.

[0034]

As described above, according to the present invention, it is possible to prevent the occurrence of cracks at the sealing position of the valve neck in the electron gun sealing device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an electron gun sealing device.

FIG. 2 is a schematic view showing a sealing head.

FIG. 3 is a schematic diagram showing a sealing positional relationship between a glass bulb and an electron gun.

FIG. 4 is a schematic view showing a heating device.

FIG. 5 is a schematic diagram showing a temperature control device of the heating device.

FIG. 6 is a schematic diagram showing a heating unit of the heating device.

[Explanation of symbols]

1 glass bulb 1A bulb neck portion 2 electron gun 2A stem portion 10 the electron gun sealing apparatus 13 seals the head 14 heating device 47 heated nozzle (heating section) 52 Temperature controller P ₁ supplied position P ₂ to P ₄ preheating position (preheating frequency) P ₅ welding position (welding area) P ₆ ~P ₈ slow cooling position (Johiyaiki) P ₉ discharge position

Claims (4)

[Claims] After passing a sealing head supplied with a glass bulb and an electron gun through a preheating region for preheating a bulb neck portion of the glass bulb, a stem portion of the electron gun is welded to the bulb neck portion of the glass bulb. Through the weld zone to seal, then
An electron gun sealing device that passes through a slow cooling region for gradually cooling a bulb neck portion of a glass bulb, wherein the heating means for heating the bulb neck portion of the glass bulb is configured to move together with the sealing head. Gun sealing device. 2. An electron gun sealing device comprising a temperature control means for controlling the heating temperature of the heating means so that the heating temperature in the preheating area becomes closer to the welding area in the preheating area. 3. An electron gun sealing device according to claim 1, wherein said heating means is provided in a sealing head. 4. The electron gun sealing device according to claim 1, wherein said heating means includes a heating portion surrounding a bulb neck portion of the glass bulb, and said heating portion is openable and closable.