KR100614832B1 - Air plasma cutting machine - Google Patents

Abstract

The present invention relates to an air plasma cutting machine.

The present invention is configured so that a commercial current is converted into a high voltage while passing through the first rectifying unit, inverter unit, transformer unit, second rectifier unit and DC reactor unit through a control unit installed inside the body to generate a plasma in the torch, In the air plasma cutting machine configured to cut the base material by the external compressed air supplied from the external compressor to the torch, the body is configured to be divided into the upper control room and the lower machine room by the partition wall, provided in the interior of the upper control room An internal compressor connected to the control unit is installed in the lower machine room, and the first pressure gauge, the first solenoid valve and the filter are sequentially coupled by using a pipe on the discharge side of the internal compressor, and between the first solenoid valve and the filter. The bypass pipe is configured to be coupled to the connector, the bypass The pipe is characterized in that the second pressure gauge and the second solenoid valve is configured to be coupled.

Therefore, the present invention is to improve the cutting workability of the base material, and to reduce the volume to carry out work directly in the field while simply carrying.

Compressor, pressure gauge, solenoid valve, torch, plasma

Description

Air plasma cutting machine

1 is a block diagram showing a schematic configuration of an air plasma cutting machine according to the present invention.

Figure 2 is a block diagram showing the configuration of a control unit applied to the air plasma cutting machine according to the present invention.

Figure 3 is a perspective view schematically showing the inside and outside of the air plasma cutting machine according to the present invention.

Figure 4 is a longitudinal cross-sectional view showing a draw handle mounted to the air plasma cutting machine according to the present invention.

Figure 5 is a flow chart illustrating a process of supplying compressed air inside and outside to the torch of the air plasma cutting machine according to the present invention.

<Brief description of symbols for the main parts of the drawings>

1: body 2: controller

3: Torch 5: Internal Compressor

6: pipe 7: bypass pipe

9: external compressor 11: bulkhead

12: Upper control room 13: Lower machine room

21: First rectifier 22: Inverter

23: transformer 24: second rectifier

25: DC reactor portion 61: first pressure gauge

62: first solenoid valve 63: filter

71: connector 72: second pressure gauge

73: third solenoid valve

The present invention relates to an air plasma cutting machine, and in particular, to automatically supply the internal and external compressed air generated from an internal compressor installed inside the air plasma cutting machine body or an external compressor installed outside thereof to a torch connected to the discharge side of the cutter body. By doing so, it is possible to facilitate the cutting of the base material, and also to reduce the volume of the cutter body so that the operator can easily carry around in the field while carrying around.

In general, a cutter that melts a cut portion of a base material by using heat of a contracted plasma arc and removes molten metal by spraying compressed air on the melted portion is called an air plasma cutter.

The cutting process of the basic substrate of the air plasma cutting machine first generates a pilot arc between the nozzle and the electrode of the torch using a high frequency voltage, and the generated pilot arc heats the orifice gas flowing through the nozzle and ionizes the gas. To provide an atmosphere.

The ionized gas then contracts as it passes through the nozzle and is present as a conductor between the electrode and the base material, forming a high density, high temperature, and high temperature plasma arc.

In such an air plasma cutting machine, the rectified DC is smoothed while passing through the first rectifying unit via a capacitor. The inverter converts the smoothed current into high-frequency AC by high-speed switching, and converts the converted high-frequency AC. Plasma is generated between the base material and the torch as it is applied to the torch via the transformer, the second rectifier and the direct current reactor, and a part of the base material is melted by the heat of the generated plasma. As the external compressed air is supplied to the torch, the cut base material can be obtained by blowing the molten portion of the base material downward.

However, when a large capacity external compressor is used to continuously supply compressed external compressed air from the outside to the nozzle of the torch where plasma is generated, it is inconvenient to move due to its relatively large volume. There was another problem of low workability.

Meanwhile, a separate internal compressor is used inside the air plasma cutting machine to prevent inconvenience or lower workability when moving to a work place. However, filtering is supplied to a supply line for supplying the internal compressed air to the torch. In addition to the problem that the plasma atmosphere is incomplete because it is not installed, and when using it connected to the external compressor, there was a hassle that the operator must connect or switch the discharge side through manual operation.

The present invention has been created to solve the above problems, by automatically selecting the internal and external compressed air generated by the internal compressor installed in the interior of the air plasma cutter body or an external compressor installed in the outside to the torch to selectively supply, It is an object of the present invention to provide an air plasma cutting machine that can easily carry out work in the field while easily carrying around by reducing the volume of the air plasma cutting machine body to facilitate cutting work of the base material.

In order to achieve the above object, the present invention converts a commercial current into a high voltage while passing through a first rectifying unit, an inverter unit, a transformer unit, a second rectifying unit, and a DC reactor unit through a control unit installed in the body. In the air plasma cutting machine configured to generate a plasma, the base material is cut by the external compressed air supplied from the external compressor to the torch, the body is configured to be divided into the upper control room and the lower machine room by the partition wall, An internal compressor connected to a control unit provided in the upper control room is installed in the lower machine room, and the first pressure gauge, the first solenoid valve, and the filter are sequentially connected by using a pipe on the discharge side of the internal compressor; 1Bypass pipe with connector between solenoid valve and filter But configured such that the sum, the bypass pipe has its object to provide an air plasma cutting machine according to claim arranged to be coupled and a second pressure gauge, and the second solenoid valve is achieved.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Plasma cutting machine (A) according to the present invention, as shown in Figures 1 to 3, the body (1), the control unit (2), the torch (3), the internal compressor (5) and the bypass pipe (7) It is composed.

Here, the body 1 is provided to provide a predetermined space therein and is divided into an upper control room 12 and a lower machine room 13 on both sides of the upper and lower sides by a partition wall 11 fixed in a horizontal direction at the center thereof. It is configured to

In the upper control chamber 12 provided to the partition 11, a control unit 2 having a plurality of resistors, capacitors, relays, and direct circuits electrically connected to the PCB is fixed in place, and in the control unit 2, It operates the internal compressor 5 to be described later or checks the pressures of the internal compressor 5 and the external compressor 9 in real time to stably supply the internal and external compressed air to the torch 3. The second pressure gauges 61 and 72 and the first and second solenoid valves 62 and 73 are configured to be electrically connected to each other.

In addition, the controller 2 supplies a power supply to the torch 3 so that a stable plasma is generated. The first rectifier 21, the inverter unit 22, the transformer unit 23, and the second rectifier ( 24 and the DC reactor portion 25 are electrically connected.

On the other hand, the upper portion of the body (1) is formed with a carrying handle 14 that can easily carry it when moving, and a plurality of non-illustrated ventilation holes and the like are formed on all surfaces except the upper portion of the body (1) The heat generated from (2) is discharged to the outside to prevent overheating and the outside air is easily supplied to the internal compressor (5).

In addition, a plurality of wheels 15 are formed on both sides of the lower rear side of the body 1, and bargings 16 are formed on both sides of the front lower portion so that the plasma cutter is moved by the vibration of the internal compressor 5. It is configured to be prevented. The baring 16 is more preferably provided with a rubber material.

And the front of the body (1) is inserted into the fixed or fixed to, or withdrawn to the outside is drawn out the handle that the operator can drag it and easily move the work place.

As shown in FIG. 4, the drawing handle 8 is configured such that a movable rod 82 having a handle 821 is inserted into or withdrawn from a predetermined depth in a hollow fixing rod 81. The 81 and the movable rod 82 allow the withdrawal handle 8 to always be withdrawn at a certain position and maintain the withdrawal completed by the position fixing means 83 interposed therebetween. It is comprised so that the state may be kept in the state which inserted 8) in the fixed rod 81. As shown in FIG.

To this end, the position fixing means 83 forms positioning holes 811 and 812 having a form in which upper and lower portions or left and right sides penetrate at both ends of the fixing rod 81 to be horizontally inside the body 1. The fixing body 1 having the locking pieces 832 and 832 ′ fixed thereto and receiving elastic force on both sides of the spring 831 to the end of the movable rod 82 inserted into the fixing rod 81. When the pull rod 8 is pulled out from the fixed rod 81 by pulling out the pull handle 8, or the pull rod 8 is pushed in, the movable rod 82 is completely inserted. The end portions of the engaging pieces 832 and 832 'are fitted to the positioning holes 811 and 812.

The internal compressor 5 is installed in the lower machine room 13 provided inside the lower part of the body 1 and is configured to be operated or stopped in response to a signal of the control unit 2. On the discharge side, the first pressure gauge 61, the first solenoid valve 62, and the filter 63 are sequentially configured by using a plurality of pipes 6 having a predetermined length.

The first pressure gauge 61 is electrically connected to the input side of the control unit 2 and is configured to open or close the second solenoid valve 73 to be described later, and the first solenoid valve 62 is the control unit 2. Is electrically connected to the output side of the &lt; RTI ID = 0.0 &gt;) &lt; / RTI &gt; and configured to be selectively opened or closed by the controller 2 in accordance with an electrical signal of the second pressure gauge 72 described later.

In addition, on one side of the inner space of the lower machine room 13 in which the internal compressor 5 is installed, a bypass pipe 7 having a connector 71 selectively connecting it to the discharge side of the external compressor 9, The bypass pipe (7) allows the external compressed air supplied from the external compressor (9) to be discharged to the torch (3) via the filter (63), and at the same time the internal compressed air of the internal compressor (5) The second pressure gauge 72 and the second solenoid valve 73 are provided on the bypass pipe 7 so as to have a function of preventing the leakage of oil into the furnace.

This bypass pipe 7 is configured such that airtightness is maintained between the first solenoid valve 62 and the filter 63.

When cutting the base material by using the external compressed air of the external compressor 9 in the air plasma cutting machine configured as described above, first, the external compressor 9 in a state in which the discharge side of the external compressor 9 is connected to the connector 71. As the power is applied to the external compressor 9 at the same time as pressing the operation switch shown in the drawing, the external compressed air is generated.

Next, power is supplied through the control unit 2 at the same time as pressing other switches not shown in the body 1, and the supplied power is the first rectifying unit 21, the inverter unit 22, and the transformer unit 23. As a result of being supplied to the torch 3 via the second rectifying unit 24 and the DC reactor unit 25, plasma is generated between the torch 3 and the base metal to melt a portion of the base material.

At the same time, the external compressed air generated through the external compressor (9) acts at a uniform pressure through the connector (71), and this pressure transmits a high signal to the controller (2) through the second pressure gauge (72). Is authorized.

Next, the controller 2 recognizes that external compressed air is generated from the external compressor 9 as a high signal is applied from the second pressure gauge 72, and closes the first solenoid valve 62. At the same time, the second solenoid valve 73 is opened.

Next, the second solenoid valve 73 is opened by the control unit 2 and the external compressed air is supplied to the torch 3 after passing through the filter 63. As the molten part falls to the lower part of the base material, cutting is made.

In this state, when the external compressed air is not supplied due to a failure of the external compressor 9 or for other reasons, the second pressure gauge 72 outputs the signal low, so that the control unit 2 currently outputs the external compressor 9. The internal compressor (5) is operated after recognizing that external compressed air is not generated and supplied from the furnace.

Next, when a constant pressure is applied to the discharge side of the internal compressor 5 according to the operation of the internal compressor 5, the first pressure gauge 61 applies a high signal to the control unit 2, and at the same time, the control unit 2 generates a first pressure. The two solenoid valve 73 is closed and the first solenoid valve 62 is opened.

Next, as the internal compressed air generated from the internal compressor 5 is supplied to the torch 3 through the filter 63, the cutting operation can be continued.

At this time, the air passing through the first solenoid valve 62 acts on the bypass pipe 7 so that a part of the air leaks to the outside through the bypass pipe 7, but is provided in the bypass pipe 7. By keeping the second solenoid valve 73 closed, it is possible to prevent the pressure of the internal compressed air supplied to the torch 3 from lowering.

On the other hand, when the plasma cutting machine is transported to another place after the cutting of the base material is completed, the close distance is transported using the carrying handle 14 formed on the upper portion of the body 1, when the relatively long distance body (1) When pulling out the pull handle (8) provided in the front of the hand by the hand is inserted into the inside of the body (833) of the engaging pieces (832, 832 ') protruding on both sides to the end of the movable rod 82 by the force As the compressed spring 831 is pushed into the inside of the fixed rod 81, the movable rod 82 inserted into the fixed rod 81 is easily drawn out, and the movable rod 82 of the fixed rod 81 is removed. The ends of the engaging pieces 832 and 832 ′ which are positioned at the end and under the elastic force of the spring 831 are inserted into the positioning holes 812.

Therefore, the withdrawal handles 8 drawn out toward the front of the fixed rod 81 can maintain the drawn out state unless a separate force is applied.

Next, the operator lifts the handle 821 of the take-out handle 8 and at the same time the front of the body 1 is lifted and the wheel 15 at the rear thereof is brought into contact with the floor, and the desired pull After moving to the next work place, the locking pieces 832 and 832 'are inserted into the positioning hole 811 through the same process as described above while pressing the takeout handle 8 toward the rear of the body 1. .

As described above, the present invention allows the internal and external compressed air generated from the internal compressor installed inside the air plasma cutting machine body or the external compressor installed outside thereof to be selectively supplied to the torch to selectively supply the torch, thereby facilitating cutting of the base metal. The effect which can improve workability can be obtained.

In addition, by reducing the volume of the air plasma cutter body, it is possible to further carry out the effect of facilitating the cutting of the base material while easily carrying it in the field.

Claims (3)

The commercial current is connected to the first rectifier 21, the inverter 22, the transformer 23, the second rectifier 24, and the DC reactor 25 through the controller 2 installed inside the body 1. The air plasma cutting machine is configured to generate a plasma in the torch 3 by converting it into a high voltage while passing through it, and cutting the base material by the external compressed air supplied from the external compressor 9 to the torch 3. In (A), The body 1 is configured to be divided into the upper control room 12 and the lower machine room 13 by the partition wall 11, but the internal compressor connected to the control unit 2 provided in the upper control room 12 ( 5) is installed in the lower machine chamber 13, and the first pressure gauge 61, the first solenoid valve 62, and the filter 63 are sequentially formed by using the pipe 6 on the discharge side of the internal compressor 5. And a bypass pipe (7) having a connector (71) between the first solenoid valve (62) and the filter (63), wherein the bypass pipe (7) is a second pressure gauge. 72 and the second solenoid valve 73 is configured to be coupled to the air plasma cutting machine. The method of claim 1, The body (1) comprises a pull-out handle (8) provided on the front surface of the movable rod 82 having a handle (821) in the hollow fixing rod 81 is inserted or withdrawn to a predetermined depth, the fixed rod (81) and the movable rod (82) is an air plasma cutting machine, characterized in that configured to be maintained in the drawn or inserted state at a predetermined position by the position fixing means (83). The method of claim 2, The positioning means 83 is fixed to the fixing rod 81, the positioning holes 811, 812 formed in the both ends of the horizontally in the interior of the body 1, and inserted into the fixing rod 81 Air plasma cutting machine, characterized in that the fixing body (833) having a built-in engaging piece (832) (832 ') receiving elastic force on both sides of the spring (831) is coupled to the end of the movable rod (82).

Images