KR100895610B1 - A gas valve assembly for welding machine - Google Patents

Abstract

According to the gas valve assembly for welding machine which can exhibit the gas saving function according to the present invention; Along with the opening and closing operation of the solenoid valve 31 on the welding main body 30 side, the orifice 212 of the valve block 200 corresponding to the inlet side of the gas hose 40 is also automatically opened and closed through a mechanical mechanism, thereby providing a solenoid valve ( At the moment 31 is closed, the inlet and outlet ends of the gas hose 40 are simultaneously closed, so that the gas pressure in the gas hose 40 is kept constant.

Therefore, when the operator starts the welding by pressing the switch 63 of the welding torch 60, the gas in the gas hose 40 is ejected at a stable pressure, thereby excellent welding start, and unnecessary gas outflow is prevented by gas The savings are excellent. In addition, the pressure of the gas outflow pressure 300 may be visually checked through the pressure gauge 300, and the operator may easily adjust the gas flow rate through the adjustment screw 570.

In addition, since the regulator unit 600 for discharging the gas on the storage tank 10 side at a constant pressure is integrally formed, the product can be more compactly configured and the worker can easily install the product. It has an effect.

In addition, when the gas pressure of the storage tank 10 introduced through the regulator unit 600 is excessively high, the gas pressure is immediately discharged to the outside through the safety valve 240, the safety accident can be prevented in advance There is this.

Welding machine, welding torch, gas hose, gas saving, gas valve

Description

GAS VALVE ASSEMBLY FOR WELDING MACHINE

The present invention relates to a welding machine using argon gas or carbon dioxide gas; More particularly, the present invention relates to a gas valve assembly for a welder that can maintain a constant gas pressure in a gas hose to stably discharge initial gas at the start of welding and effectively prevent unnecessary gas leakage. .

In general, the welding machine used in the industrial field contacts and applies the welded parts to the molten state by using heat sources such as gas, arc, electricity, resistance heat, friction heat, and the like, and contacts the heated member or the member at room temperature with each other. There are those which are joined together by applying pressure to the members based on the applied voltage.

Among these welders, a gas welder using a welding gas such as argon gas or carbon dioxide gas is most commonly used in manufacturing steel structures, ships, automobiles, and the like; This includes a storage tank in which welding gas (argon gas or carbon dioxide gas, etc.) is stored, a regulator disposed at the outlet side of the storage tank to allow the gas to flow at a constant pressure, an outlet side of the regulator and a gas hose (usually It consists of a flexible rubber hose) and a solenoid valve for controlling the gas supply is installed, and a welding main body is provided with various electric appliances and a switch for controlling the solenoid valve is provided to receive gas through the welding main body and to control the cable. It is equipped with a welding torch electrically connected through the base, and a base cable electrically connected to the welding base and connected to the base metal.

Therefore, in the conventional gas welding machine, when the base cable is connected to the base material as the welding target and the welding wire on the welding torch side is contacted, the welding wire is melted by different electrical characteristics, thereby performing welding. In addition, when the welding is started while the welding wire is melted, the welding gas (argon gas or carbon dioxide gas) is ejected from the welding torch to form a fence, thereby preventing contact between the portion where the welding proceeds and external air. Therefore, a beautiful welding bead can be obtained, and unlike arc welding, since there is no coating, the back finishing is simple and clean.

On the other hand, the welding gas blowing of the gas welder is made while the operator presses the switch of the welding torch while the solenoid valve is opened. When the operator releases the switch, the solenoid valve is immediately turned off to cut off the welding gas.

However, in the conventional gas welding machine, the operator repeatedly operates the welding torch switch while performing the welding work. When the solenoid valve is closed, a considerable length of the gas hose connecting the storage tank and the welding main body is filled with gas at a pressure higher than the ejection pressure. This is because the storage tank is filled with welding gas at a significant pressure. Therefore, every time the operator presses the switch of the welding torch to open the solenoid valve, the gas is suddenly ejected at a large pressure for several seconds, and this causes a significant waste of welding gas.

The high pressure ejection phenomenon of the welding gas proceeds for about 5 seconds or more, which is about 2 to 3 seconds long until the gas hose filled with the high pressure in the gas hose is equal to the discharge pressure of the regulator. The longer the gas hose connecting the storage tank side and the welding body, the more severely generated. In addition, the instantaneous high pressure gas ejection has a problem of adversely affecting the deposited metal to cause welding defects.

The present invention is to solve this problem; An object of the present invention is installed in the gas hose connecting the storage tank side and the welding main body to ensure a stable gas discharge at a constant pressure in the welding torch at the beginning of the operation, as well as to reduce the gas can effectively prevent unnecessary gas leakage It is to provide a gas valve assembly for a welder capable of functioning.

In addition, another object of the present invention is to integrate a regulator function for flowing out the gas at the storage tank side at a constant pressure to configure the product more compact, as well as to exhibit a gas saving function that can facilitate the installation of the product. It is to provide a gas valve assembly for a welder.

In addition, another object of the present invention is to install a safety function that can be immediately discharged to the outside when the gas pressure flowing into the storage tank is excessively high welder that can exhibit a gas saving function that can prevent the accident in advance To provide a gas valve assembly for.

The present invention for achieving this object is;

In order to supply the gas for welding, one end is connected to the storage tank side where gas is stored at high pressure, and the other end is disposed in the gas hose connected to the solenoid valve side of the welding body, and the opening and closing operation of the solenoid valve according to the switching operation at the welding torch side. In the gas valve assembly for welding machine which can open and close automatically according to the present invention;

The gas valve assembly for the welder; The bore is processed from the rear to form a gas flow space, and at the bottom center, an orifice is drilled into the valve bore, and the bore is formed from the bottom, and one end of the gas hose is directly connected to the outlet. A metal valve block provided to protrude so as to surround the periphery, and having a gas flow space formed therein, the bottom edge of the metal valve block having a housing coupling part in which a gas passage connected to the outlet is perforated; A pressure gauge mounted on a pressure gauge-bore machined to a side of the metal valve block to be connected to a gas flow space of the housing coupling part to display a gas outflow pressure; The gas inlet member is connected to the storage tank side and the gas inlet member is provided with a gas outlet at the front end, and the inside is hollow in the axial direction, and the front end portion of the gas inlet member is coupled to the rear center portion by a screw coupling method. And a coupling member having a cylinder portion at the front end portion thereof, and a rear end portion thereof coupled to the screw portion while receiving the tip portion of the coupling member. The tip portion is coupled to the inlet side of the valve bore by a screw coupling method. The regulator body is a gas discharge hole perforated, the front end is made of a large diameter portion that can move back and forth while being in close contact with the inner wall of the regulator body and the rear end is made of a small diameter portion that can move back and forth while being in close contact with the cylinder portion of the coupling member and the inside Gas discharged through the gas outlet of the gas inlet member to the gas discharge hole A piston member having a perforated gas discharge passage for guiding to the side, a valve seat disposed at a rear end of the piston member to open and close a gas outlet of the gas-inlet member according to forward and backward movement of the piston member, and inside the regulator body A regulator unit arranged in the coil spring to elastically support the piston member in a direction of opening the gas ejection opening of the gas inlet member, the regulator unit guiding the gas to the gas flow space of the valve bore below a predetermined pressure; A needle valve unit having a needle disposed at the valve bore bottom of the valve block so as to move forward and backward through the orifice and to open and close the orifice; A valve driving unit mounted to a housing coupling portion of the valve block and operating a needle of the needle valve unit according to a gas pressure at an outlet side connected to the gas hose; It is characterized by including.

In addition, the present invention is the O-ring for preventing gas leakage is disposed on the outer diameter of the large diameter portion and the small diameter portion of the piston member of the regulator unit; A gas guide hole for guiding gas inflow toward the gas discharge flow path side is formed at a rear end side of the piston member; A stepped groove is formed in a concave step portion so as to form a predetermined gap with a tip wall surface of the regulator main body at a front end surface of the large diameter portion of the piston member; When a gas pressure equal to or greater than a predetermined pressure is formed between the large diameter portion of the piston member and the front end wall of the regulator body, the piston member is retracted while compressing the coil spring of the regulator unit to close the gas outlet of the gas inlet member. When the pressure falls below a certain pressure, the piston member is advanced again to open the gas outlet of the gas-inlet member.

In addition, the present invention is a valve body having a tip of the needle valve unit is formed in a conical shape so that the needle of the needle valve unit to directly open and close the orifice, a support rod protruding in the axial direction from the center of the tip of the valve body to penetrate the orifice freely With; An elastic member elastically supporting the needle in a direction in which the needle valve unit closes the orifice; A valve cap mounted to a bottom of the valve bore by a screw coupling method to support the elastic member, and having a gas through-hole perforated in the center thereof; It is characterized by further comprising.

In addition, the present invention is the valve drive unit; A valve housing mounted to the housing coupling portion of the valve block by a screw coupling method and having an empty interior; A diaphragm of a thin plate, the edge of which is crimped to the front end of the housing coupling part and covers the gas flow space of the housing coupling part, and whose central portion is stretchable back and forth; A circular pressure transfer plate disposed to abut between the diaphragm and the support rod of the needle; An elastic member disposed in the valve housing and elastically supporting the diaphragm and the pressure transfer plate to apply pressure to the needle in a direction of opening the orifice, but supporting the diaphragm and the pressure transmitting plate with a higher supporting force than that of the needle valve unit. With; When the solenoid valve of the welding body is closed and the gas pressure at the outlet side connected to the gas hose is equal to the gas pressure at the gas flow space side of the valve bore, the diaphragm and the pressure transfer plate are elastic members of the valve driving unit. Push to compress the needle to close the orifice; When the solenoid valve of the welding body is opened so that the gas pressure at the outlet side connected to the gas hose is lower than the gas pressure at the gas flow space side of the valve bore, the diaphragm and the pressure are supported by the elastic member supporting force of the valve driving unit. A transfer plate pushes the needle to open the orifice.

In addition, the present invention is the valve drive unit; Front and rear prevention finger boards respectively disposed in front and rear of the elastic member in the valve housing; An adjusting screw coupled to penetrate forward and backward through the front end of the valve housing to vary the elastic support force of the elastic member; It is characterized by further comprising.

In addition, the present invention is provided on the side of the valve block is provided with a bore-processed discharge bore to be communicated through the connection passage with the gas flow space of the valve bore; The valve bore is mounted on the discharge bore of the valve block by screwing on the discharge bore, the gas inlet hole is drilled in the front end, the sliding hole is drilled in the inside, and the valve body in which the gas exhaust hole is drilled in the lateral direction, and the sliding of the valve body. A valve disposed to open and close the gas inlet hole in the hole, a coil spring elastically supporting the valve in a direction of closing the gas inlet hole, and a screw coupling method to close the sliding hole of the valve body, It is characterized in that the safety valve is provided with a valve cap for adjusting the bearing force of the coil spring.

According to the gas valve assembly of the welding machine capable of exhibiting a gas saving function according to the present invention; In addition to opening and closing of the solenoid valve on the welding body side, the orifice of the valve block corresponding to the gas hose inlet side is also automatically opened and closed by a mechanical mechanism. As soon as the solenoid valve is closed, the inlet / outlet ends of the gas hose are simultaneously closed to allow the gas in the gas hose to close. There is an effect of keeping the pressure constant.

Therefore, when the operator starts the welding by pressing the switch of the welding torch, the gas in the gas hose is ejected at a stable pressure, thereby excellent welding start, and unnecessary gas outflow is prevented to have an excellent gas saving effect. In addition, it is possible to check the gas outflow pressure through the pressure gauge, as well as the operator can easily adjust (set) the gas outflow pressure through the adjustment screw.

In addition, according to the gas valve assembly of the welding machine capable of exhibiting a gas saving function according to the present invention; Since the regulator unit for discharging the gas at the storage tank side at a constant pressure is integrally formed, the product can be configured more compactly, and the operator can easily install the product.

In addition, according to the gas valve assembly of the welding machine capable of exhibiting a gas saving function according to the present invention; When the storage tank side gas pressure flowing through the regulator unit is excessively high, the gas pressure is immediately discharged to the outside through the safety valve, there is an advantage that can prevent the accident in advance.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. (The present invention is to be installed in the gas hose of the general gas welding machine to reduce the gas, for the convenience of understanding the configuration of the gas valve assembly according to the present invention after explaining the configuration of the gas welding machine to which the present invention is applied. do.)

<Description of welder configuration to which the present invention is applied>

As shown in FIG. 1, a welding machine to which the present invention is applied includes a storage tank 10 in which a welding gas (argon gas or carbon dioxide gas, etc.) is stored, and an opening / closing valve 20 is provided at an upper portion thereof, and the storage tank 10. Welding main body 30 connected to the on-off valve 20 side and the gas hose 40 of the, and the overload circuit breaker (50, NFB; No Fuse that supplies the power required for the welding main body 30 and is automatically cut off when overloaded) Breaker), a welding torch 60 connected through a welding base 30, a welding cable 61, and a control cable 62, and a base electrically connected to the welding base 30 and connected to a base material as a welding target. The cable 80 is provided.

Various electrical appliances are arranged on the welding base 30, and in particular, a solenoid valve 31 is opened and closed by a switch 63 (configured as a push switch) provided in the welding torch 60. The solenoid valve 31 is connected to the gas hose 40 to control the gas supply to the welding torch 60 side. In the middle of the welding cable 61 and the control cable 62, a wire feeder 70 for automatically supplying the welding wire to the welding torch 60 side is disposed. In addition, a gas ejection hole (not shown) is radially formed at the tip of the welding torch 60.

Therefore, when the welding worker contacts the welding wire on the welding torch 60 side with the base material (welding object) while pressing the switch 63 provided in the welding torch 60, the welding of the base cable 80 side and the welding torch 60 is performed. The welding is performed while the welding wire is melted by different electrical characteristics with the wire. In addition, the solenoid valve 31 is opened in accordance with the push operation of the switch 63 of the welding torch 60 so that the welding gas of the storage tank 10 is supplied through the gas hose 40 and the welding cable 61. Radial blow through the gas ejection hole of the welding torch 60 to form a fence. Such a gas fence is able to obtain a beautiful welding bead by blocking the contact between the site where the welding proceeds and the external air.

When the welding worker releases the switch 63 while separating the welding torch 60 from the base material as the welding target, the solenoid valve 63 of the welding base 30 is closed to cut off the welding gas supply. In this way, the ejection of the welding gas is made while the operator presses the switch 63 provided in the welding torch 60 while the solenoid valve 31 is opened. When the switch 63 is released, the solenoid valve 31 is momentarily closed. The welding gas ejection is blocked.

Description of gas valve assembly configuration according to the present invention

On the other hand, as shown in Figures 1 and 2, the gas saving function according to the present invention at the end of the flexible gas hose 40 connecting the welding tank body 30 and the storage tank 10 side in which the welding gas is stored A gas valve assembly 100 capable of exerting a pressure is disposed. The gas valve assembly 100 not only discharges the welding gas supplied from the storage tank 10 at a constant pressure, but also the gas pressure of the gas hose 40 according to the opening / closing operation of the solenoid valve 31 of the welding main body 30. It is a mechanical valve that can be automatically opened and closed to reduce welding gas.

2 and 3, the gas valve assembly 100 according to the present invention is a regulator unit 600 for introducing a constant pressure to the welding gas, the gas hose while the gas flows from the regulator unit 600 A metal valve block 200 formed with a gas flow path so as to exit to the side 40, a needle valve unit 400 for opening and closing the orifice 212 formed inside the valve block 200, and the needle valve unit ( The valve driving unit 500 for operating 400 and the pressure gauge 300 for displaying the gas outlet pressure to the outside are provided, and the detailed structure of each component is as follows.

First, referring to FIGS. 3 to 5, the valve block 200 is formed of a metal block having a substantially hexahedral shape, and forms a body of the gas valve assembly 100. The back of the valve block 200 is a bore (BORE) is processed to have a female thread to form a gas distribution space 211 and the valve bore 210 is made of a perforated orifice 212 in the center of the inner wall, the valve block The lower surface of the (200) is bored to have a female thread is formed is an outlet 220 (OUTLET) is connected to one end of the flexible gas hose 40 directly connected through a connector.

And the upper surface of the valve block 200 is provided with a pressure gauge-bore 230 which is bore-processed to have a female thread. The pressure gauge-bore 230 is equipped with a pressure gauge 300 for checking the gas outflow pressure, the bottom surface of the pressure gauge-bore 230 is coupled to the housing to be described later through the gas inlet 231 It is in communication with the gas flow space 251 of the unit 250. Therefore, the operator can check the gas outflow pressure exiting through the outlet 220 through the pressure gauge 300.

In addition, a housing coupling part 250 is provided on the central portion of the front surface of the valve block 200 so as to protrude so as to surround the orifice 212 to form a gas flow space 251 therein. A male thread is processed on the outer wall of the housing coupling part 250, and a gas passage 252 connected to the outlet 220 and a gas inflow passage 231 described above are perforated at the bottom edge thereof.

In addition, as shown in Figure 4, the side of the valve block 200 is processed through the discharge passage 260 which is associated with the gas flow space 211, 2 of the valve bore 210 through the linkage path (261). In this case, when the gas pressure in the gas flow space 211 of the valve bore 210 is greater than or equal to a predetermined pressure, a safety valve 240 is immediately mounted to immediately discharge the high pressure gas to the outside. The safety valve 240 is coupled to the discharge bore 260 by a screw coupling method, the gas inlet hole 241a is drilled at the front end, the sliding hole 241b is drilled inside, and the gas outlet hole 241c at the rear end. A valve body 241 drilled in the direction, a valve 242 disposed to be able to move forward and backward to open and close the gas inlet hole 241a in the sliding hole 241b of the valve body 241, and the valve ( The coil spring 243 elastically supporting the gas inlet hole 241a in the direction of closing the gas inlet hole 241a, and is mounted in a screwing manner to close the sliding hole 241b of the valve body 241. It is equipped with a valve cap 244 that can adjust the bearing capacity. Therefore, when the gas pressure transmitted through the linkage path 2221 overcomes the support force of the coil spring 243 of the safety valve 240, the valve 242 of the safety valve 240 is pushed to open the gas inlet hole 241a. In this case, the high pressure gas introduced through the linkage path 261 is immediately discharged to the outside through the sliding hole 241b and the gas discharge hole 241c of the safety valve 240, thereby preventing a safety accident due to the high pressure gas. Will be.

3 and 7, the needle valve unit 400 includes a needle 410 having a tip through the orifice 212 at the bottom of the valve bore 210 of the valve block 200. It will open and close. The needle 410 of the needle valve unit 400 of the valve body 411 and the valve body 411 so that the tip of the valve body 411 has a conical shape to open and close the orifice 212 directly, and the orifice 212 is allowed to pass through. O-ring made of elastic material for substantially opening and closing the orifice 212 disposed at the tip of the valve body 411 so as to surround the lower end of the support rod 412 protruding in the axial direction protruding from the center of the tip; Defined as 413. In addition, the needle valve unit 400 is an elastic member 420 (consisting of a coil spring in the embodiment of the present invention) to elastically support the needle 410 in the direction of closing the orifice 212 at the bottom of the valve bore 210 and In addition, the valve bore 240 is mounted to the valve bore 240 to support the elastic member 420 and has a valve cap 430 in which a gas through hole 431 is perforated. Therefore, the needle 410 is always elastically supported in the direction of closing the orifice 242 in the valve bore 230 by the elastic member 420 and the valve cap 430. And the gas flowing from the inlet side of the valve bore 210 exits to the bottom of the valve bore 210 through the gas through hole 431 of the valve cap 430.

And the regulator unit 600 is mounted to the inlet side of the valve bore 210, the needle valve unit 400 is mounted to the welding gas flows; A gas inlet member 610 connected to the storage tank 10 side for guiding initial gas inflow, a coupling member 620 for arranging the gas inlet member 610, and the coupling A regulator body 630 for integrally mounting the member 620 to the valve block 200, and a piston member 640 for controlling gas inflow by moving forward and backward in accordance with the gas pressure in the regulator body 630; The detailed structure of each component is as follows.

First, as described above, the gas-inlet member 610 is connected to the storage tank 10 side so that gas is introduced and a gas outlet 611 is provided at the tip. And the coupling member 620 is made to be hollow in the axial direction, the front end portion of the gas inlet member 610 is coupled to the rear end central portion thereof by screw coupling method, the cylinder portion 621 to the front end central portion thereof ) Is formed. In addition, the rear end of the regulator body 630 is coupled to the screw coupling method while the front end portion of the coupling member 620 is accommodated, the front end portion of the regulator 630 is screwed on the inlet side of the valve bore 210. Are combined. In addition, the gas discharge hole 631 is perforated on the front end wall of the regulator body 630, thereby communicating with the valve bore 210.

The piston member 640 is composed of a large diameter portion 641, the front end is in close contact with the inner wall of the regulator body 630, the rear end is in close contact with the cylinder portion 621 of the coupling member 620 is movable back and forth. It consists of the small diameter part 642. In addition, a gas discharge passage 643 is formed in the piston member 640 to guide the gas discharged through the gas outlet 611 of the gas inlet member 610 to the gas discharge hole 631. At the center of the rear end of the piston member 640, a hard valve seat 645 is disposed to open and close the gas outlet 611 of the gas inlet member 610 according to the forward and backward movement of the piston member 640. . In addition, O-rings 646 and 647 are disposed on the outer circumference of the large diameter portion 641 and the small diameter portion 642 of the piston member 640, and the gas is discharged at the rear end side of the piston member 640. A gas guide hole 644 for guiding gas inflow to the flow path 643 is drilled. In addition, a stepped groove 648 is formed in the front end surface of the large diameter portion 641 of the piston member 640 so as to form a concave gap with the front end wall surface of the regulator body 630, which will be described later. ) To increase the operational responsiveness.

In the regulator body 630, a coil spring 650 elastically supporting the piston member 640 is disposed in a direction in which the gas ejection opening 611 of the gas inlet member 610 is opened. Reference numeral 632 denotes an air vent hole drilled in the side wall of the regulator body 630, and reference numeral 660 denotes an O-ring in which a sealing coupling is disposed on the front end wall of the regulator body 630.

Accordingly, when a gas pressure of a predetermined pressure or more is formed between the large diameter portion 641 of the piston member 640 and the front end wall of the regulator body 630, the piston member is compressed while compressing the coil spring 650 of the regulator unit 600. 640 is reversed to close the gas outlet 611 of the gas-inlet member 610. When the gas pressure between the large diameter portion 641 of the piston member 640 and the distal wall surface of the regulator body 630 falls below a predetermined pressure, the piston member 640 is advanced again, and the gas outlet port of the gas inlet member 610 is moved. By opening the 611, the gas is stably supplied to the gas flow space 211 of the valve bore 210 at a predetermined pressure or less. In the embodiment of the present invention, the piston member 640 is configured to stably supply the gas below a predetermined pressure while advancing back and forth at a high speed of about 1 mm according to the gas pressure.

And with reference to FIGS. 3 and 8; The valve driving unit 500 is mounted on the housing coupling part 250 of the valve block 200 and according to the gas pressure on the outlet 220 side connected to the gas hose 40, the needle 410 of the needle valve unit 400. ) Is to selectively operate. To this end, the valve drive unit 500 is mounted to the housing coupling portion 250 of the valve block 200 in a screw coupling manner and has an empty valve housing 510 and an edge at the front end of the housing coupling portion 250. Is pressed to cover the gas flow space 251 of the housing coupling portion 250, the central portion of the thin diaphragm 520 that can be stretched back and forth, and the support rod 411 of the diaphragm 520 and the needle 410 A circular pressure transfer plate 530 disposed to abut between the diaphragm and the diaphragm 520 disposed in the valve housing 510 to apply pressure to the needle 410 in the direction of opening the orifice 212. And an elastic member 540 for elastically supporting the pressure transfer plate 530. In addition, the edge of the diaphragm 520 is formed by the step 511 formed on the inner wall of the valve housing 510 in the process of mounting the valve housing 510 to the housing coupling part 250 by a screw coupling method. Squeezed to the tip. In addition, the elastic member 540 of the valve driving unit 500 is also made of a coil spring, which is a diaphragm 520 and the pressure transfer plate 530 with a bearing force greater than that of the elastic member 420 of the needle valve unit 400. Is configured to support).

Therefore, the gas pressure at the outlet 220 side where the solenoid valve 31 of the welding body 30 is closed and connected to the gas hose 40 is equal to the gas pressure at the gas flow space 211 side of the valve bore 210. When the diaphragm 520 and the pressure transfer plate 530 are compressed while compressing the elastic member 540, the needle 410 closes the orifice 212, and the solenoid valve 31 of the welding base 30 is closed. When the gas pressure on the outlet 220 side which is opened and connected to the gas hose 40 is lower than the gas pressure on the gas flow space 211 side of the valve bore 210, the elastic member 540 of the valve driving unit 500. The diaphragm 520 and the pressure transfer plate 530 push the needle 410 to open the orifice 212 by the elastic support force. This operation process is described in detail in the operation description below.

In addition, the valve driving unit 500 is coupled to the front and rear prevention plate 550, 560 respectively disposed in front and rear of the elastic member 540, so as to move back and forth to the front end of the valve driving housing 510, the front support plate. An adjusting screw 570 is further provided to move the position of the 550 back and forth. Therefore, when the adjustment screw 570 is rotated in the forward and reverse direction, the elastic support force of the elastic member 540 is variable while the position of the front support plate 550 is moved, whereby the welding worker opens and closes the needle 410 opening and closing points. It can be set.

<Description of the operation of the gas valve assembly according to the present invention>

Next, the operation of the gas valve assembly for welding machine according to the present invention configured as described above and the effect thereof will be described with reference to FIGS. 3 and 9.

First, referring to FIG. 3, the welding gas stored in the storage tank 10 includes the gas inlet member 610 of the regulator unit 600, the gas discharge passage 643 of the piston member 640, and the regulator body 630. It is supplied into the gas bore 211 of the valve bore 210 of the valve block 200 through the gas discharge hole 631 of the.

At this time, when the gas pressure in the gas flow space 211 of the valve bore 210 is more than the set pressure (2kgf / ㎠ in the embodiment of the present invention), the large diameter portion 641 and the regulator body 630 of the piston member 640 Gas pressure above a certain pressure is also immediately formed between the tip walls of This gas pressure reverses the piston member 640 while compressing the coil spring 650 of the regulator unit 600, so that the valve seat 645 fits the gas outlet 611 of the gas inlet member 610. Touch and close it. In addition, when the gas pressure in the gas flow space 211 of the valve bore 210 is maintained below the set pressure, the gas pressure is also applied between the large diameter portion 641 of the piston member 640 and the distal wall of the regulator body 630. It immediately falls, which causes the piston member 640 to be advanced again by the coil spring 650 to open the gas outlet 611 of the gas inlet member 610. The piston member 640 is moved back and forth (stroke about 1mm) is made immediately according to the gas pressure change, the welding gas at a constant pressure into the valve bore 210 gas flow space 211 of the valve block 200. Is supplied.

And if the welding operator has released the switch 63 of the welding torch 60; The solenoid valve 31 of the welding body 30 is closed while the welding gas ejection is blocked. As the solenoid valve 31 connected to the gas hose 40 is closed, the gas pressure of the outlet 220 side of the gas hose 40 and the valve block 200 connected to the gas hose 40 is connected to the gas bore 210. It becomes the same as the space 211 side. That is, as the gas pressure on the outlet 220 side of the valve block 200 does not escape to the outside, the gas flow space 251 of the housing coupling part 250 of the valve block 200 is instantaneously filled. Accordingly, the pressure transfer plate 530 and the diaphragm 520 holding the needle 410 by the gas pressure in the gas coupling space 251 of the housing coupling part 250 are elastic members 540 of the valve driving unit 500. Is pushed while compressing. Accordingly, the needle 410 closes the orifice 212 by the elastic support force of the elastic member 420 of the needle valve unit 400.

As a result, the solenoid valve 31 of the welding main body 30 is closed at the same time as the orifice 242 of the valve block 200 is also closed, thereby closing both ends of the gas hose 40 instantaneously. Therefore, the gas pressure 40 supplied in the actual welding operation is maintained intact inside the gas hose 40, and the gas pressure can be confirmed through the pressure gauge 300.

On the other hand, when the welding worker presses the switch 63 of the welding torch 60 to perform welding, the solenoid valve 31 of the welding main body 30 is opened while the welding gas is ejected. In addition, as shown in Figure 9; As the solenoid valve 31 connected to the gas hose 40 is opened, the gas at the outlet 220 side of the gas hose 40 and the valve block 200 connected thereto is released and the gas pressure of the solenoid valve 31 is opened. It is slightly lower than the gas distribution space 211 side of 210. Accordingly, as the gas pressure on the outlet 220 side of the valve block 200 escapes to the outside, the diaphragm 520 and the pressure transfer plate 530 of the valve driving unit 500 are elastically supported by the elastic member 540. The needle 410 is pressed again to open the orifice 242. Therefore, the welding gas of the storage tank 10 is the gas discharge passage 642 and the gas discharge hole 631 of the regulator unit 600 → gas flow space 211 of the valve block 200 → gas cylinder of the valve cap 430 Ball 431 → The orifice 242 of the valve bore 240 → Outlet 220 exits the gas hose 40 (see the direction of the arrow in Fig. 9), and continues through the solenoid valve 31 opened It is supplied to the welding torch 60.

As a result, the solenoid valve 31 of the welding main body 30 is opened, and the orifice 212 of the gas valve assembly 100 is also opened, thereby stably supplying the welding gas on the storage tank 10 side. At this time, the initial gas pressure supplied to the welding torch 60 by pressing the switch 63 is also supplied with the gas in the gas hose 40 which is kept constant, so that a stable and accurate amount of gas is supplied from the start of the welding operation.

In addition, the welding gas passes through the inner tube 320 of the flow meter unit 300 to lift the steel ball 321 at the gas blowing pressure, the operator can visually measure the gas blowing pressure through the height of the steel ball 321. have. In the state where the welding torch 60 switch 63 is continuously pressed for several seconds or more, the high pressure gas in the storage tank 10 is ejected at a constant pressure through the regulator unit 600.

As such, the orifice 212 of the valve block 200 connected to the end of the gas hose 40 may also be opened or closed depending on whether the welding operator opens or closes the solenoid valve 31 according to the switch operation of the welding torch 60. Therefore, the gas pressure in the gas hose 40 is maintained at the moment when the solenoid valve 31 is closed, and the welding gas in the gas hose 40 is stably ejected at the initial welding moment when the solenoid valve 31 is opened again. This makes it possible to stably generate an initial arc and effectively prevent unnecessary gas outflow.

Substantially, as the result of the applicant's experiment, as shown in FIG. 10, when the switch of the welding torch is pressed in the general gas welding machine, the gas filled at a considerable pressure in the gas hose is instantaneously ejected and a considerable amount of gas is wasted (hatched). Part), in the case of the welding machine in which the gas reduction valve assembly according to the present invention is applied to the end of the gas hose, when the switch of the welding torch is pressed, the gas filled at a stable pressure in the gas hose is stably ejected, thereby effectively preventing gas wasting. Could know.

In particular, it was found that the gas saving effect is excellent in the case of the temporary welding operation that repeatedly performs the switch operation of the welding torch. On the other hand, in the gas reduction valve assembly according to the present invention, the regulator unit 600 for discharging the high pressure gas of the storage tank 10 at a constant pressure is integrally mounted to the valve block 200, thereby making the product configuration more compact. Of course, the installation of the product can be facilitated.

In addition, the safety valve 240, as described in the configuration description, when the gas pressure flowing from the storage tank 10 side is excessively high, the valve 242 is pushed open and the high pressure gas is immediately discharged to the outside, safety Accidents are prevented.

Figure 1 shows the overall configuration of a gas welder to which the present invention is applied.

Figure 2 is an enlarged perspective view of the gas valve assembly for welding machine according to the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2, showing an internal structure of a gas valve assembly for a welder according to the present invention.

Figure 4 is a perspective view showing a part of the internal structure of the valve block of the gas valve assembly according to the present invention.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, showing the internal structure of the valve block.

6 is an exploded perspective view showing the flow meter unit structure of the gas valve assembly according to the present invention.

7 is an exploded perspective view showing a needle valve unit and a regulator unit structure of a gas valve assembly according to the present invention.

8 is an exploded perspective view showing the valve driving unit structure of the gas valve assembly according to the present invention.

Figure 9 shows the operating state of the gas valve assembly according to the present invention, it shows the open state of the orifice of the valve block.

10 is a graph showing the initial gas ejection flow rate at the start of welding in a conventional welder and a welder to which the present invention is applied.

* Description of the symbols for the main parts of the drawings *

10. Storage tank 30. Welding base 31. Solenoid valve

40. Gas hose 60. Welding torch 63. Switch

100.Gas valve assembly 200.Valve block 210.Valve bore

212 Orifice 220 Outlet 300 Pressure gauge

400 .. Needle Valve Unit 410. Needle 500. Valve Drive Unit

520 diaphragm 600 regulator unit

Claims (6)

For the supply of welding gas, one end is connected to the storage tank 10 side at which gas is stored at a high pressure, and the other end is disposed at the gas hose 40 connected to the solenoid valve 31 side of the welding main body 30, and a welding torch In the gas valve assembly for welding machine which can be opened and closed automatically according to the opening and closing operation of the solenoid valve 31 in accordance with the switching operation on the (60) side; The gas valve assembly 100 for the welder; The bore is processed from the rear to form a gas flow space 211, and the bottom of the bottom is orifice 212 perforated valve bore 210 and the bottom is made of the bore processing, one end of the gas hose 40 is directly connected The outlet 220 is connected to the outlet, and is provided to protrude so as to surround the orifice 212 on the front center, and a gas flow space 251 is formed therein, and a gas passage connected to the outlet 220 at the bottom edge thereof. A metal valve block 200 having a housing coupling part 250 in which 252 is perforated; A pressure gauge for mounting the pressure gauge-bore 230 which is processed to be connected to the gas flow space 251 of the housing coupling part 250 on the side of the metal valve block 200 to display the gas outflow pressure ( 300); Gas inlet member 610 connected to the storage tank 10 side and the gas inlet 611 is provided at the front end, and the inside is hollow in the axial direction, and the gas inlet member at the rear central portion Coupling member 620 is coupled to the front end portion of the 610 by a screw coupling method and the cylinder portion 621 is formed in the central portion of the tip, and the rear end portion of the coupling member 620 while the front end portion of the coupling member is screwed in The front end is coupled to the inlet side of the valve bore 210 by the screw coupling method, the gas discharge hole 631 is drilled on the front end wall and the front end of the regulator body 630 The rear end is composed of a large diameter portion 641 that is moved back and forth while being in close contact with the inner wall of the coupling member 620 is made of a small diameter portion 642 that is movable back and forth while being in close contact with the cylinder part 621. Inlet member ( A piston member 640 having a gas discharge passage 643 for guiding the gas ejected through the gas outlet 611 of the 610 toward the gas discharge hole 631, and a rear end of the piston member 640. And a valve seat 645 that opens and closes the gas outlet 611 of the gas-inlet member 610 according to the forward and backward movement of the piston member 640, and is disposed inside the regulator body 630. A coil spring 650 for elastically supporting the piston member 640 in the direction of opening the gas ejection opening 611 of the inlet member 610 so that the gas flows through the valve bore 210 at a predetermined pressure or less; A regulator unit 600 for guiding to the space 211 side; A needle valve unit 400 having a needle 410 for opening and closing the orifice 212 is disposed at the bottom of the valve bore 210 of the valve block 200 so that the tip can move forward and backward through the orifice 212. )and; The needle 410 of the needle valve unit 400 is operated in accordance with the gas pressure of the outlet 220 that is mounted to the housing coupling part 250 of the valve block 200 and connected to the gas hose 40. A valve driving unit 500 for; Gas valve assembly for welders that can exhibit a gas saving function, characterized in that it comprises a. The method of claim 1, O-rings (646) (647) for preventing gas leakage is disposed on the outer circumference of the piston member (640) large diameter portion (641) and small diameter portion (642) of the regulator unit (600); A gas guide hole 644 is formed in the rear end side of the piston member 640 to guide the gas inflow to the gas discharge passage 643; A stepped groove 648 is formed in the front end surface of the large diameter portion 641 of the piston member 640 so as to form a predetermined gap with the front end wall surface of the regulator body 630; When a gas pressure equal to or greater than a predetermined pressure is formed between the large diameter portion 641 of the piston member 640 and the front end wall of the regulator body 630, the piston member is compressed while compressing the coil spring 650 of the regulator unit 600. 640 is reversed to close the gas outlet 611 of the gas-inlet member 610, and when the gas pressure falls below a predetermined pressure, the piston member 640 is advanced again to the gas-inlet member 610. A gas valve assembly for a welder that can exhibit a gas saving function, characterized in that the gas ejection opening (611) is opened. The method of claim 1, The needle 410 of the needle valve unit 400 has a valve body 411 having a tip of a conical shape to directly open and close the orifice 212, and an axial direction from a center of the tip of the valve body 411. A support rod (412) protrudingly extending through the orifice (212); The needle valve unit 400 includes an elastic member 420 elastically supporting the needle 410 in the direction of closing the orifice 212; A valve cap 430 mounted on a bottom of the valve bore 210 to support the elastic member 420 by a screw coupling method, and a gas through hole 431 perforated in a central portion thereof; A gas valve assembly for a welder that can further exhibit a gas saving function, characterized in that it further comprises. The method of claim 3, wherein The valve driving unit 500 is; A valve housing 510 mounted to the housing coupling part 250 of the valve block 200 by a screw coupling method and having an empty inside; A diaphragm 520 of a thin plate having an edge compressed at the front end of the housing coupling part 250 to cover the gas flow space 251 of the housing coupling part 250, and having a central portion thereof stretchable back and forth; A circular pressure transfer plate 530 disposed to abut between the diaphragm 520 and the support rod 412 of the needle 410; The needle is disposed inside the valve housing 510 and elastically supports the diaphragm 520 and the pressure transfer plate 530 to apply pressure to the needle 410 in the direction of opening the orifice 212. It is provided with an elastic member 540 for supporting with a higher supporting force than the elastic member 420 of the valve unit 400; When the solenoid valve 31 of the welding body 30 is closed and the gas pressure on the outlet 220 side connected to the gas hose 40 is the gas pressure on the gas flow space 211 side of the valve bore 210. When the diaphragm 520 and the pressure transfer plate 530 is pushed while compressing the elastic member 540 of the valve drive unit 500 so that the needle 410 closes the orifice 212. ; The gas pressure at the outlet 220 side at which the solenoid valve 31 of the welding base 30 is opened to be connected to the gas hose 40 is greater than the gas pressure at the gas flow space 211 side of the valve bore 210. When lowered, the diaphragm 520 and the pressure transfer plate 530 push the needle 410 to open the orifice 212 by the support force of the elastic member 540 of the valve driving unit 500. Gas valve assembly for welding machine which can exhibit gas saving function. The method of claim 4, wherein The valve driving unit 500 is; Front and rear prevention boards 550 and 560 disposed in front and rear of the elastic member 540 in the valve housing 510, respectively; An adjusting screw 570 coupled to penetrate the front end of the valve housing 510 so as to move back and forth to vary the elastic support force of the elastic member 540; A gas valve assembly for a welder that can further exhibit a gas saving function, characterized in that it further comprises. The method of claim 1, The side of the valve block 200 is provided with a bore-processed discharge bore 260 to communicate with the gas flow space 211 of the valve bore 210 through the linkage path 261; The discharge bore 260 of the valve block 200 is mounted to the discharge bore 260 by screwing, and the gas inlet hole 241a is drilled at the front end, and the sliding hole 241b is drilled inside, and the gas at the rear end thereof. A valve body 241 in which the discharge hole 241c is laterally drilled, a valve 242 arranged to open and close the gas inlet hole 241a in the sliding hole 241b of the valve body 241, Coil spring 243 for elastically supporting the valve 242 in the direction to close the gas inlet hole 241a, and is mounted in a screw coupling method to close the sliding hole 241b of the valve body 241 A gas valve assembly for a welder capable of exhibiting a gas saving function, characterized in that a safety valve (240) having a valve cap (244) for adjusting the bearing force of the coil spring (243) is disposed.

Images