KR20010109764A - Apparatus for fusion-welding stud pin to crt panel - Google Patents

Abstract

The present invention relates to a pin fusion apparatus of a cathode ray tube panel having a pin chuck for adsorbing stud pins and a heating device for generating an induced electromotive force to heat the stud pins to fuse them to the cathode ray tube panel. An induced electromotive force measuring unit for measuring generated induced electromotive force; And a controller for generating an error signal when the measurement result value from the induction electromotive force measuring unit is out of a predetermined allowable range compared to a reference value. Thereby, the pin fusion apparatus of the cathode ray tube panel which can prevent a series of pin fusion processes from being performed without the stud pin adsorb | sucking to a pin chuck is provided.

Description

Pin welding device for panel for cathode ray tube {APPARATUS FOR FUSION-WELDING STUD PIN TO CRT PANEL}

The present invention relates to a pin fusion apparatus for a cathode ray tube panel, and more particularly, to a pin chuck for adsorbing stud pins, and a heating device for generating an induced electromotive force to generate heat to the cathode ray tube panel by heating the stud pins. It relates to a pin fusion apparatus of a cathode ray tube panel.

Generally, a cathode ray tube has a panel disposed in front of it to project an image, a funnel shaped funnel coupled to the rear of the panel, and a neck having an electron gun coupled to the nose portion of the funnel. Then, the panel and the funnel are formed by heating the raw material of the glass in the melting furnace, and then supplying the molten glass to each forming apparatus and pressurizing it.

Here, the panel has a flat face portion on which the image is projected and a skirt portion bent from each side of the face portion. Phosphors are applied to the inner surface of the face of the panel, and one stud pin is fused to each skirt so that a frame combined with a shadow mask can be mounted on the inner surface of the skirt.

4 is a side view of a fin fusion apparatus of a conventional cathode ray tube panel. As shown in this figure, the conventional pin-fusion apparatus of the cathode ray tube panel, the guide portion 113 is installed so that the linear reciprocating movement by the support frame 110, the transfer portion 112 provided on the support frame 110. ), A pin chuck 117 that sucks the stud pins 115, and a heating device 125 that heats the stud pins 115 that are attracted to the pin chucks 117.

Inside the pin chuck 117, a predetermined accommodation hole 118 is formed along the axial direction. In addition, an air conduit 119 is connected to one side of the receiving hole 118 to generate suction force into the receiving hole so that the stud pin 115 can be adsorbed on the other side, and the air conduit 119 is a vacuum generating suction force. It is connected to the pump 120. A pin chuck holder 121 for fixing the pin chuck 117 is provided above the guide portion 113, and a pin chuck support block 123 for supporting the pin chuck 117 is provided at an upper end of the pin chuck holder 121.

By this configuration, when the stud pin 115 is placed in front of the pin chuck 117 through a stud pin supply device (not shown), the vacuum pump 120 is operated to suck air, and this suction force is an air conduit ( 119 is transmitted to the receiving hole 118 of the pin chuck 117 to allow the stud pin 115 to be adsorbed to one end of the pin chuck 117. Thereafter, the heating device 125 supplied with power from a power supply unit (not shown) induction heats the stud pin 115 adsorbed to the pin chuck 117 to about 1200 ° C. As such, when the stud pin 115 is heated to a predetermined temperature, the guide portion 113 is moved to the fusion position of the stud pin 115 toward the inside of the scud portion of the panel 109 by a linear cam (not shown). The stud pin 115 may be melted while being melted on the inner wall surface of the skirt 111.

By the way, in the conventional fin fusion apparatus of the cathode ray tube panel, even if the stud pin is not adsorbed to the pin chuck, a series of pin fusion processes are continuously performed, which may result in mass production of a defective panel. As such, when a defective panel occurs, the inspector goes through a process of checking whether the defective panel is defective or not, but there is a problem that the defective panel may be regarded as a good product and transferred to a later process due to the inelegance of the worker.

Accordingly, an object of the present invention is to provide a pin welding device for a cathode ray tube panel which can prevent a series of pin welding processes from being performed without a stud pin being adsorbed to the pin chuck.

1 is a side view of the pin fusion apparatus of the cathode ray tube panel according to the present invention,

2 is an enlarged perspective view of the heating apparatus of FIG. 1;

3 is a control block diagram according to the present invention;

4 is a side view of a fin fusion apparatus of a conventional cathode ray tube panel.

* Explanation of symbols for the main parts of the drawings

9 panel 15 stud pin

17: pin chuck 25: heating device

33: induction electromotive force measuring unit 35: control unit

According to the present invention, a pin fusion apparatus of a cathode ray tube panel having a pin chuck for adsorbing stud pins and a heating device for generating an induced electromotive force to heat the stud pin to be fused to the cathode ray tube panel, An induction electromotive force measuring unit measuring an induction electromotive force generated by the heating apparatus; It is achieved by the pin welding device of the cathode ray tube panel, characterized in that it comprises a control unit for generating an error signal when the measurement result value from the induction electromotive force measuring unit is out of a predetermined allowable range compared to the reference value.

Here, the induction electromotive force measuring unit may be replaced with a power meter electrically connected to the heating device.

And, it can be configured to further include an alarm device for generating the error signal by the control unit, wherein the alarm device includes both of generating an audible alarm sound and visually realizing the lighting of the lamp, etc. can do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Pin fusion apparatus of the cathode ray tube panel according to the present invention, as shown in Figure 1, the guide portion is installed so that the linear reciprocating motion by the support frame 10, the transfer portion 12 provided on the support frame 10 (13), the pin chuck 17 which adsorbs the stud pin 15, and the heater 25 which heats the stud pin 15 adsorb | sucked by the pin chuck 17 to about 1200 degreeC.

The pin chuck 17 is formed of a ceramic material, and an air conduit 19 is provided between the inner accommodating hole 18 of the pin chuck 17 and the vacuum pump 20 so as to suck the stud pin 15 made of metal. It is connected. Accordingly, when the suction force of the vacuum pump 20 is operated, the stud pin 15 may be adsorbed to the distal end of the pin chuck 17 through the air conduit 19. In addition, the pin chuck holder 21 fixing the pin chuck 17 is erected on the upper side of the guide portion 13 so that the pin chuck 17 can be linearly reciprocated integrally with the guide portion 13. A pin chuck support block 23 is provided above 21.

As shown in FIG. 2, the heating device 25 has a heat generating housing 27 having a coil therein and a conductive portion 30 extending upward from the heat generating housing 27 and adjacent to the pin chuck 17. In addition, the induction electromotive force measuring unit 33 according to the present invention is installed in the electric line 26 extending from the heating device 25, and as shown in FIG. 3, the induction electromotive force measuring unit 33 is shown. The control part 35 which operates the alarm apparatus 38 according to the result measured by the measuring part 33 is provided.

The heat generating housing 27 has a rectangular cylinder shape, and an induction coil for forming an electromagnetic field in response to the supply of power is arranged in a ring in the heat generating housing 27.

The conductive portion 30 extends upwardly from one end of the heat generating housing 27 to contact the pin chuck 17, and is sucked to the pin chuck 17 by transferring an induced current from the heat generating housing 27 to the pin chuck 17. The stud pin 15 generates heat by alternating magnetic flux. The through-hole 31 formed larger than the maximum diameter of the stud pin 15 is formed in the plate surface of the one end part of the conductive part 30 which contacts the pin chuck 17. On the other hand, the heat generating housing 27 and the conductive portion 30 is formed of different materials is very advantageous to increase the efficiency of the electron induction action. That is, it is also suitable for the boundary condition of the so-called magnetic field. Therefore, in order to minimize the loss of induced electromotive force, for example, the heat generating housing 27 may be formed of bronze and the conductive portion 30 may be formed of a pure copper material.

As shown, the induction electromotive force measuring unit 33 is disposed on an electric line extending from the heating device 25, and at first, an electromagnetic field is formed in the heat generating housing 27 by the power supply unit, When induced electromotive force is generated, the induced electromotive force is measured. Therefore, in the present embodiment, the inductive electromotive force measuring unit 33 uses a power meter that can include both current and voltage.

On the other hand, when the measurement result value from the induced electromotive force measuring unit 33 is out of the predetermined range from the reference value, the control unit 35 generates the alarm device 38. Therefore, the control part 35 includes both the memory part which memorize | stores a reference value initially, and the comparison part which compares a reference value and the measured result value within a predetermined | prescribed allowable range. Here, the reference value generally refers to a voltage generated at the heating device 25 when the stud pin 15 is adsorbed on the pin chuck 17, about 150 kV, and the predetermined allowable range indicates approximately ± 0.05%. .

The alarm device 38 which generates an error signal to the outside by the control unit 35 is mainly used to generate an audio signal by sound. However, in some cases, it is possible to substitute not only for generating a visual signal by using a flashing light, but also to stop the operation of the pin welding device when an error signal is generated.

By this configuration, when the panel 9 is disposed at a predetermined position of the pin welding apparatus and the stud pin 15 is supplied in front of the pin chuck 17, the suction force is generated in the vacuum pump 20 and the suction force is air. By passing through the conduit 19 to the receiving hole 18 in the pin chuck 17, the stud pin 15 can be adsorbed to the pin chuck 17. When the stud pin 15 is adsorbed to the pin chuck 17, the heating device 25 according to the present invention is operated to heat the stud pin 15 to about 1200 ℃. The operation process is as follows.

First, when power is supplied to the heating device 25 by a power supply unit (not shown), an electromagnetic field is generated in an induction coil arranged in a ring in the heat generating housing 27, and after that, the electromagnetic field is generated in the heat generating housing 27. It is transferred to the conductive portion 30 disposed up to the pin chuck 17 through. As such, when an electromagnetic field is generated in the conductive part 30, alternating magnetic flux is generated in the metal stud pin 15 adsorbed to the pin chuck 17.

In more detail, when all conductive materials are put in a phase change magnetic field, an eddy current is generated. That is, when alternating magnetic flux is generated in the conductor, induction electromotive force is generated in the conductor, and eddy current is generated by the induction electromotive force. At this time, when an eddy current flows in a conductor having an arbitrary resistance, heat is generated in the conductor. That is, the eddy current loss (EDDY CURRENT LOSS) is generated.

As such, when the alternating magnetic flux is generated on the stud pin 15, heat generated by the induced electromotive force is generated on the stud pin 15, that is, an eddy current loss (EDDY CURRENT LOSS) is generated and the stud pin 15 is about 1200. The guide portion 13 is moved to the fusion position of the stud pin 15 toward the inner wall of the skirt portion 11 of the panel 9 by a linear cam (not shown) in conjunction with the heating. Accordingly, the heated stud pin 15 can be fused while melting the inner wall surface of the skirt portion 11.

Meanwhile, while a series of processes in which the stud pin 15 is fused to the panel 9 is in progress, the induction electromotive force measuring unit 33 measures the induction electromotive force generated by the heating device 25. When the stud pin 15 is adsorbed to the pin chuck 17, the induced electromotive force of about 150 volts is generated in the heating device 25, but the pin chuck 17 is caused by the malfunction of the vacuum pump 20 or other factors. In the case where the stud pin 15 is not adsorbed, the induced electromotive force of about 140 volts less than the reference value is generated.

Therefore, if the result value measured by the induction electromotive force measuring unit 33 is similar to the reference value within the predetermined allowable range due to such a difference, the control unit 35 has the stud pin 15 adsorbed to the pin chuck 17. After that, it is determined that the stud pin 15 is normally fused to the panel 9, so that the alarm device 38 does not operate.

On the contrary, in contrast, when the measured value measured by the induction electromotive force measuring unit 33 is different from the reference value outside the predetermined allowable range, the control unit 35 determines that the stud pin 15 is not adsorbed on the pin chuck 17. By operating the alarm device 38, the defective panel is detected. Thus, what is regarded as a defective panel by the measurement result value of the induced electromotive force measuring unit 33 is disposed of so that it is no longer transferred to the post process.

As described above, in the present invention, the measurement result values from the induction electromotive force measuring unit 33 and the induction electromotive force measuring unit 33 for measuring the induction electromotive force generated in the heating device 25 may be out of a predetermined allowable range compared to the reference value. In this case, the controller 35 may be configured to generate an error signal, thereby preventing a series of pin fusion processes from being performed without the stud pin 15 being adsorbed to the pin chuck 17.

As described above, according to the present invention, there is provided a pin welding device for a cathode ray tube panel which can prevent a series of pin welding processes from being performed without a stud pin being adsorbed to the pin chuck.

Claims (3)

In the pin fusion apparatus of the cathode ray tube panel having a pin chuck for absorbing the stud pin and a heating device for generating an induced electromotive force to heat the stud pin to fusion to the cathode ray tube panel, An induction electromotive force measuring unit measuring an induction electromotive force generated by the heating apparatus; And a control unit for generating an error signal when a measurement result value from the induction electromotive force measuring unit is out of a predetermined allowable range compared to a reference value. The method of claim 1, The induction electromotive force measuring unit, the pin fusion apparatus of the cathode ray tube panel, characterized in that the power meter is electrically connected to the heating device. The method of claim 1, Pin fusion apparatus of the cathode ray tube panel further comprises an alarm device for generating the error signal by the control unit.