JP2572110Y2 - Gas control valve for exhaust head in tube making machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tube manufacturing machine for manufacturing a tube for a fluorescent lamp, which is suitable for controlling the supply of argon gas to the inside of the tube or exhausting air from inside the tube. The present invention relates to a gas control valve for a head.

[0002]

2. Description of the Related Art In a tube manufacturing machine for manufacturing a tube for a fluorescent lamp, there is a step of exhausting air from inside the tube and then injecting a predetermined amount of mercury into the tube. When injecting the mercury, a predetermined amount of mercury is sent from the mercury filling device into the exhaust head, and then the mercury is filled into the bulb from the exhaust pipe with argon gas. In a conventional exhaust head, an elastic tube is connected to an exhaust line or a gas supply line to control the exhaust of air from the tube and the filling of argon gas into the tube. Crushed by a pressing member operated by a hydraulic cylinder or an electromagnetic actuator,
The crushing may be stopped, and exhaust control or supply of argon gas is controlled.

A gas control valve using such an elastic tube has a simple structure and can be manufactured at low cost. However, the tube is repeatedly crushed, so that the tube is damaged early and needs to be replaced in about one week. . There is also a problem that replacement of the tube is complicated and troublesome.

[0004]

The problem to be solved by the present invention is to provide a gas control valve for an exhaust head in a tube manufacturing machine which has a simple structure, is durable and easy to maintain. is there.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a gas control valve for an exhaust head in a tube manufacturing machine, wherein a recess opening at one end, a first port opening at the bottom of the recess, A body formed with a second port that opens on the peripheral surface of the recess, a valve body movably disposed in the recess of the body, and a valve body removably attached to the body and removably mounted on the body. A bearing member movably guided, a recess is formed around the entire periphery of the valve body, and the recess is always in contact with the inner peripheral surface of the concave portion and selectively contacts the bottom surface of the concave portion. An annular sealing member that comes into contact is arranged.

[0006]

In the gas control valve having the above-described structure, when the valve body is separated from the bottom of the recess, the sealing member provided on the periphery of the valve body is separated from the bottom surface of the recess, so that the gas flowed in from the first port. Gas enters the recess and flows out of the recess into the second port. When the valve body is pushed into the bottom of the recess, the seal member contacts the bottom surface of the recess and the communication between the first port and the inside of the recess is prevented by the valve body and the seal member. Therefore, gas from the first port cannot flow into the second port.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas control valve of the present invention will be described below with reference to the drawings. FIG. 1 shows a gas control valve 10 of the present embodiment. The gas control valve 10 includes a main body 11 and a valve body 12 movably disposed in the main body.
And a bearing member 13 attached to the main body 11. The main body 11 has a concave portion 111 that opens at one end (the upper end in FIG. 1), a first (for example, an inlet) port 113 that opens to the concave portion at the bottom surface 112 of the concave portion 111, and a concave portion 11.
1 has a second (eg, output) port 115 that opens into the recess 111 at a position where the bottom corner, that is, the bottom surface 112 and the inner peripheral surface 114 of the recess intersect. The first port, ie, the inlet port 113, opens on the side surface (the left side surface in FIG. 1) of the main body, and is connected to a vacuum source or a gas source via a pipe 116 or the like. The side is open.

The valve body 12 is formed integrally with the lower end (as shown in FIG. 1) of the long shaft portion 121, and a recess 122 is formed all around the lower end periphery. A seal member 125 such as an O-ring seal is mounted in the recess 122. The outer periphery of the seal member projects radially outward from the outer periphery of the valve body 12 so that the inner peripheral surface 114 of the concave portion 111 of the main body is formed.
And the size is such that when the valve body is pushed down, the output port 115 is in contact with the bottom surface 112 of the concave portion around the opening 117 on the concave portion 111 side. Bearing member 1
3 is detachably fixed to the main body 11 at the opening end of the concave portion 111 by a plurality of fixing screws 14. The bearing member 13 has a cylindrical portion 131 and a flange 132 formed integrally with the cylindrical portion on the outer periphery of the cylindrical portion 131 and having one surface (the lower surface in FIG. 1) abutting on the upper surface of the main body 11. . A bush 133 that slidably receives the shaft portion 121 of the valve body 12 is fitted in the cylindrical portion 131. The valve element 12 is elastically pressed upward by a spring 15 disposed between a spring receiver 151 attached near the upper end of the shaft 121 and a spring receiver 152 arranged adjacent to the upper surface of the bearing member 12. 161 and 162 are the main body 11
And a bearing member for sealing between the bearing member and the shaft member of the valve body.

The valve body 12 opens and closes when the upper end of the shaft 121 is pushed down by an operating mechanism 17 provided thereon. The operation mechanism 17 is rotatably supported by the fulcrum 171 and is in contact with the upper end of the shaft portion 121. The operation mechanism 17 is rotatably supported by the fulcrum 173 above the arm 172 and has one end in contact with the upper surface of the arm 172. A roller 175 for pressing the arm is rotatably arranged and attached to the lever 174. When the valve body 12 is in the raised position as shown in FIG. 1, the first port, ie, the inlet port 113, and the second port, ie, the output port 115,
Communicate through. The upper end of the shaft portion 121 of the valve body 12 is pushed down by the operation mechanism 17 so that the valve body 12
Is pushed down to the bottom of the recess 111, the sealing member 12
5 contacts the bottom surface 112 and the sealing member 125 contacts the upper surface of the recess 122 of the valve body, so that communication between the inlet port 113 and the output port 115 is prevented.

The gas control valve 10 is used, for example, together with an exhaust head (hereinafter simply referred to as an exhaust head) for a tube manufacturing machine shown in FIGS. 2 to 6
The exhaust head 1 includes a head body 2 having a mercury tank 3 disposed thereon, a vertically extending fixed shaft 4 disposed in the mercury tank 3, and a fixed shaft 4 around the fixed shaft 4 in the mercury tank. It comprises a hollow shaft 5 rotatably arranged, a push rod 6 extending in the head body in the transverse direction at right angles to the fixed shaft, and an exhaust pipe sealing device 7.

A mercury tank 3 is provided above the head body 2. A rod hole 22 is formed in the head main body 2 so as to penetrate in the lateral direction (the horizontal direction in FIG. 2). As shown in FIG. 4, an exhaust passage 27 and a gas supply passage 28 are formed in the head main body 2 in parallel with the rod hole 22. The control valve 10 is mounted as a vacuum valve 10a and a gas supply valve 10b on a side portion of the main body 2 as shown in FIG. 3 by a known method, and is provided between the exhaust passage 27 and a vacuum source (not shown). And communication between the gas supply passage 28 and a gas supply source (not shown). In this case, the output port of the control valve 10 is connected to the exhaust passage 27 or the gas supply passage 28. The operating mechanism is supported on the head body between the vacuum valve and the gas gas valve by a known method.

Next, the operation of the vacuum valve 10a and the gas supply valve 10b as an example of use of the control valve 10 will be described with reference to the exhaust head 1.
A description will be given in connection with the operation of (1). The exhaust pipe B of the bulb V is held in a state of being inserted into the exhaust pipe sealing device 7 as shown in FIG. At this time, the valve body 12 of the vacuum valve 10a and the gas supply valve 10b has
7, the first port 11
Communication between the third port and the second port 115 is blocked. The tip of the exhaust pipe B and the tip of the push rod 6 (the right end in FIG. 2) are separated from each other as shown in FIG. In this state, when the control valve, that is, the valve body 12 of the vacuum valve 10a is released from being pushed down and is pushed up by the spring 15, the exhaust passage 27 communicates with a vacuum source (not shown). Therefore, the tube V
The air inside is exhausted through the exhaust pipe B, the rod hole 22 and the exhaust passage 27. At this time, the lever 56 attached to the upper end of the hollow shaft 5 is at the position X in FIG. 3, and the measuring hole 52 of the sleeve portion 51 of the hollow shaft 5 is connected to the shaft of the mercury passage 33 formed in the bottom wall 30 of the tank 3. The through hole 41 is located at a position aligned with the opening end on the side of the hole 32, and the through hole 41 and the gas passage 35 are blocked by the sleeve portion 51. For this reason, the range of the exhausting action is limited to the nozzle hole 61 of the push rod 6 and the fixed shaft 4.
Up to the inside of the through hole 41. On the other hand, when the metering hole 52 of the sleeve portion 51 is aligned with the mercury passage 33, the mercury passage 33 is formed by a hole 54 formed in the flange 53 of the hollow shaft 5.
The mercury in the mercury tank flows into the metering hole 52 through the hole 54 and the mercury passage 33 because the mercury tank communicates with the inside of the mercury tank 30 through the hole.

When the evacuation of the tube V is completed, the vacuum valve 10
a is closed by the valve body 12 being pushed down by the operating mechanism 17 to cut off the communication between the exhaust passage 27 and the vacuum source, and then the push rod 6 is pushed rightward in FIG. The end comes into contact, and then the lever 56 is pivoted about 90 ° clockwise in FIG. 2 to the Y position.
Then, the metering hole 52 formed in the sleeve portion 51 of the hollow shaft 5 is fixed to the opening end on the shaft hole 32 side of the gas passage 35 in a state where a predetermined amount of mercury is stored therein, as shown in FIG. It comes between and is aligned with the circumferentially open ends of the through holes 41 formed in the shaft 4. Then, the gas supply valve 10b
The valve body 12 is opened by releasing the depression of the valve body 12 and pushing up the valve body by a spring, so that argon gas from a gas supply source (not shown) is supplied to the gas supply passage 28 and the recess 34.
Flows through the gas passage 35. Therefore, the measuring hole 52
The mercury therein is sent into the nozzle hole 61 of the push rod 6 through the through hole 41 of the fixed shaft 4 and the through hole 26 formed in the head main body 2 by the argon gas. The sphere V is filled together with the argon gas. When the filling of the mercury and argon gas into the tube is completed, the gas exhaust valve 10b is closed and the lever 56 is set to 90
° Return to the X position.

[0014]

According to the present invention, the following effects can be obtained. (1) Since the tube is not crushed, it is durable and the life of the control valve can be extended. (2) Since the valve element can be easily taken out of the main body by removing the bearing member from the main body, replacement of the seal member is easy and maintenance can be performed easily and quickly.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the gas control valve of the present invention.

FIG. 2 is a sectional view showing a part of an exhaust head using the gas control valve of the present invention.

FIG. 3 is a top view of the exhaust head of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

5 is a cross-sectional plan view of the tank, taken along line CC of FIG. 6;

FIG. 6 is a sectional view taken along line BB in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Gas control valve 11 Main body 12 Valve body 13 Bearing member 111 Depression 113,115
Port 122 Recess 125 Seal member

Claims (1)

(57) [Scope of request for utility model registration] 1. A gas control valve for an exhaust head in a tube manufacturing machine, comprising: a recess opening at one end, a first port opening at the bottom of the recess, and an opening at a peripheral surface of the recess adjacent to the bottom. Second
A body having a port formed therein, a valve body movably disposed in the recess of the body, and a bearing member removably attached to the body and guiding the valve body movably, A recess is formed around the entire periphery of the valve body, and an annular seal member that is always in contact with the inner peripheral surface of the concave portion and selectively contacts the bottom surface of the concave portion is arranged in the recess. Features a gas control valve for the exhaust head.