KR101217955B1 - Device reducing electric contact defeats of plasma cutting machine's slip ring - Google Patents

Abstract

The present invention relates to an apparatus for preventing slip ring contact failure of a plasma cutting machine. In particular, in a plasma cutting machine, an insulating rod is installed between the slip ring of the anode and the cathode and is installed between the body and the slip ring of the anode and the cathode. and; A circular slip ring of positive and negative electrodes for supplying DC voltage to the positive and negative poles of the pilot torch; A positive and negative voltage supply terminals to which the positive and negative voltage supply lines connected to the output terminals of the control unit are fixed; An anode and cathode carbon brush which directly transfers an anode voltage and a cathode voltage to the anode and cathode rod-shaped slip rings which rotate in surface contact with the outer circumferential surface of the anode or cathode rod-shaped slip ring; And a pair of coil springs that generate continuous elasticity in the anode or cathode carbon brushes, respectively.

Therefore, the contact area of the carbon brush in contact with the circular slip ring of the anode and the cathode is increased to stabilize the current supply to the pilot torch, and even after long-term use, the contact pressure of the carbon brush is constant due to the elastic force of the coil spring. The abnormality can be continuously maintained, and sufficient insulation is provided between the slip rings and the body to prevent burns of fire and components due to poor insulation, which can greatly improve the reliability of the operation of the plasma cutting machine itself. will be.

Plasma cutting machine, slip ring, carbon brush, coil spring, insulation rod

Description

Device reducing electric contact defeats of plasma cutting machine's slip ring}

The present invention relates to an apparatus for preventing slip ring contact failure of a plasma cutting machine. More particularly, when cutting an iron plate with a plasma cutting machine, a current of 250-360A is applied to a DC voltage (DC) having a supply voltage of 135-150V. In order to cause an arc, a current of 30 A is applied for 3-4 seconds to a DC voltage having a supply voltage of 440 V, and a slip ring that supplies power to a rotating torch during the process of generating a pilot arc is caused by a poor contact. It is invented to prevent the arc is generated to damage the cable connected to the control unit including the slip ring unit.

In general, welding is the joining of two metals in the molten or semi-melted state, which saves material, saves the number of processes, improves the joining efficiency, reduces the weight, is easy to repair and inexpensive. There is an advantage.

The welding technique is classified into electric welding and gas welding, and electric welding is a method of heating a joint electrically, and may be divided into resistance welding, induction welding, and arc welding according to a heating method.

The principle of arc welding is to dry the coating of chemicals and solvents around the iron core of the welding rod, generate arc between the base metal and the electrode in the electric circuit, and melt by heat of about 6,000 ℃ It is a method of joining two base materials by making (Deposite Metal).

Plasma cutting is a method of melting and cutting a cut portion of an iron plate using a plasma gas and a high temperature arc. Plasma is a positive charge (ion) and a negative charge (electron) in about the same amount. It refers to a state in which it is mixed and closes to free particles and maintains electrical neutrality. In order to generate such a plasma, a thermal dissociation phenomenon occurs by heating a gas with arc heat to cause electrons to emanate from molecules of the gas. do.

When the thermal dissociation phenomenon occurs, electrons are separated to generate thermal energy of 10000 ° C. or more, and the cutting part is melted using the thermal energy.

The arc welding machine and the plasma cutting machine are applied with an alternating current and converted into a high voltage while passing through a rectifying circuit and a high frequency circuit therein to output a direct current.

In the process of automatically cutting the steel plate, etc. using the plasma cutting machine, the torch is down to zero balance, the rotation and the angle are adjusted, and then a current of 30A is applied to the pilot torch at 440V DC voltage (DC). 3-4 seconds to form an arc using a pilot torch to form a line to be cut, and then supply a 250-360A current to the main torch at a DC voltage of 135-150V. After cutting the material into the desired shape, the torch is returned to its original position and returned to the origin.

In this case, since the torch itself rotates according to the shape of the material to be cut and an arc must be generated at a desired position, the pilot torch can supply the voltage output from the controller to the pilot torch accurately and simultaneously flow the desired current. With the torch connected, the brush must be elastically in contact with the rotating slip ring, such as a pilot burner.

However, the pilot torch of the conventional plasma cutting machine is provided with several contact terminals 12a to elastically contact the upper and lower surfaces of the pair of drum-shaped slip rings 11 having a disc shape, as shown in FIGS. 1 and 2. One or two pair of leaf springs 12 are provided.

That is, a pair of rods 13 are fixedly installed on one side of the body 2 in a vertical direction, and an insulator 14 is provided at an upper end of the rod 13, and an upper or lower surface of the insulator 14 is provided. On the upper and lower surfaces of the drum type slip ring 11 of the positive electrode or negative electrode having a disk shape and rotated together with the pilot torch, the positive and negative plate springs 12 of which the resilient contact is fixed are respectively installed. In addition, the plate spring 12 of the positive or negative electrode is configured to connect the power line 15 of the positive electrode and the negative electrode connected to the output terminal of the control unit, respectively.

However, this configuration has a drum shape in which the slip ring itself has a disc shape, and the leaf spring 12 provided with several contact terminals 12a on the upper and lower surfaces of the drum slip ring 11 has its own elastic force. The contact area of the leaf spring and the drum type slip rings are not only small, but also the point contact other than the surface contact between the drum type slip ring and the leaf spring as shown in FIG. When the drum slip ring is rotated, there is a risk of arcing, and if it is severe, it often leads to a fire topic, structural insulation is weak, and the drum slip ring is damaged due to poor contact with the leaf spring. As well as the clamping pressure drop of the brush holder (i.e., the elasticity of the leaf spring) and the groove on the surface of the slip ring. There is a problem such that the contact area is further reduced.

The present invention has been made in order to solve such a conventional problem, the slip ring itself to rotate with a pilot torch is formed in a circular shape rather than a drum, the outer surface of the cylindrical slip ring, the carbon brush is in contact with the surface The carbon brush is in contact with the carbon brush in contact with the cylindrical slip ring of the positive and negative poles by allowing the carbon brush to be in continuous contact with the circular slip ring and subjected to continuous elastic force regardless of its amount of wear by the elastic force of the coiled leaf spring. The area is increased to stabilize the current supply to the pilot torch, and even after long-term use, the contact pressure of the carbon brush in contact with the circular slip ring continues to be above a certain pressure, and between the circular slip rings and between the rotor is a longitudinal section Between the slip rings by insulating them through an insulated rod having this approximately "┘└" shape. Sufficient insulation is provided between the bodies to prevent burnout of components or components due to poor insulation, thereby providing a slip ring contact failure prevention device of the plasma cutter, which can greatly improve the reliability of the plasma cutter itself. There is a purpose.

In order to achieve the above object, the present invention provides a plasma cutting machine having a control unit, a rotatable pilot torch and a main torch, which move on a large-area sheet metal material and automatically cut a material of a desired shape, the longitudinal section being approximately An insulating rod having a “┘└” shape and installed in a state of being fitted to the rotary rod of the pilot torch to insulate between the slip rings of the anode and the cathode and the body; A positive electrode and a negative electrode round slip ring which is rotated together with the insulating rod and the rotating rod in a fixed state at a predetermined interval on the outer circumferential surface of the insulating rod and supplies a DC voltage to the positive and negative poles of the pilot torch; Positive and negative voltage supply lines connected to the output terminal of the control unit are provided with a brush and coil spring insertion hole in the horizontal direction at one end and are insulated from each other with an insulator interposed between the insulated terminal mounting rods fixed to the body in the vertical direction. A positive and negative voltage supply terminals which are fixedly installed; The anode or cathode is installed to be slidably movable in the brush and the coil spring insertion hole of the anode and cathode voltage supply terminals while being connected to the anode and cathode voltage supply terminals through a power line. An anode and cathode carbon brush which directly transfers an anode voltage and a cathode voltage to the anode and cathode rod-shaped slip rings which rotate in surface contact with the outer circumferential surface of the rod-shaped slip ring; While the center is fixed to the other end of the positive and negative voltage supply terminal and the free end is inserted into the brush and the coil spring insertion hole of the positive and negative voltage supply terminal, the continuous elastic force is generated in the positive or negative carbon brush, respectively It is characterized by consisting of; a pair of coil spring.

As described above, according to the apparatus of the present invention, the positive and negative electrode slip rings rotating together with the pilot torch are formed in a circular shape rather than a circular drum shape, and the positive and negative voltages are formed on the outer circumferential surface of the circular slip ring. The carbon brushes installed through the brushes and the coil spring insertion holes formed at both ends of the supply terminal are in contact with each other, and the carbon brushes are subjected to continuous elastic force regardless of the amount of wear by the elastic force of the coiled leaf spring, By making the surface contact, the contact area of the carbon brush in contact with the circular slip ring of the anode and cathode can be increased to stabilize the current supply to the pilot torch, and the contact of the carbon brush is caused by the elastic force of the coil spring even after long-term use. The pressure can be kept above a certain pressure , To prevent the slip ring between and damage of the agent and the components due to poor insulation has sufficient insulating body made between the in advance it would be very useful inventors etc. that can greatly improve the reliability of the operation of the plasma cutting machine itself.

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

Fig. 3 shows a perspective view of the apparatus of the present invention, Fig. 4 shows a side sectional view of the apparatus of the present invention, and Fig. 5 shows a flat sectional view of the apparatus of the present invention.

According to the present invention, there is provided a plasma cutting machine including a control unit, a rotatable pilot torch and a main torch, which move on a large-scale iron plate material and automatically cut a material having a desired shape.

The longitudinal cross section has a shape of "┘└" and is installed while being fitted to the rotary rod 1 of the pilot torch to insulate between the positive and negative pole-shaped slip rings 4a and 4b and the body 2. An insulating rod 3;

Round rod-type slip of positive and negative poles that rotates together with the insulating rods 3 and the rotating rods 1 and is fixed to the outer circumferential surface of the insulating rod 3 and supplies DC voltage to the positive and negative poles of the pilot torch. Rings 4a and 4b;

Insulated terminal mounting rods 5 provided with brushes and coil spring insertion holes 71 in the transverse direction from both sides about the center line and fixed in a vertical direction to the body 2 with an insulator 6 interposed therebetween A positive and negative voltage supply terminals 7a and 7b which are installed with the positive and negative voltage supply lines 72 connected to the output terminals of the control unit;

Sliding movement to the brush and coil spring insertion hole 71 of the positive and negative voltage supply terminals 7a and 7b while being connected to the positive and negative voltage supply terminals 7a and 7b via a power line 81. The positive and negative electrode cylindrical slip rings 4a which are installed so as to be in surface contact with the outer circumferential surface of the cylindrical slip rings 4a and 4b of the positive or negative electrode at a pressure corresponding to the elasticity of the coil spring 9. A pair of anode and cathode carbon brushes 8 which directly transfer the anode voltage and the cathode voltage to 4b;

The free end is inserted into the brush and coil spring insertion hole 71 of the positive and negative voltage supply terminals 7a and 7b while the center thereof is fixed to both ends of the positive and negative voltage supply terminals 7a and 7b. And a pair of coil springs 9 for generating continuous elastic force in the positive or negative carbon brushes 8 in the fitted state.

Referring to the operation and effect on the device of the present invention configured as described above are as follows.

First, the present invention, in the known plasma cutting machine, the insulating rod 3 having a substantially "종단 └" shape in the longitudinal section, the circular slip ring 4a (4b) of the positive electrode and the negative electrode having a relatively wide outer peripheral surface, the positive electrode and the negative electrode A main technical component is composed of voltage supply terminals 7a and 7b, a pair of positive and negative carbon brushes 8 and a pair of coil springs 9, respectively.

At this time, the insulating rod (3) has a longitudinal shape of approximately "종단 └" as shown in Figure 4 is installed in the state fitted to the rotating rod (1) of the pilot torch, the positive and negative rod-shaped slip ring (4a) Insulation function is performed between (4b) and between the body (2).

Therefore, sufficient insulation is provided between the cylindrical slip rings 4a and 4b and the body 2 to prevent burns of the fire and components due to poor insulation, thereby greatly increasing the reliability of the operation of the plasma cutting machine itself. It can be improved.

In addition, the rod-shaped slip ring (4a) (4b) is rotated together with the insulated rod (3) and the rotating rod (1) in a fixed installation at a predetermined interval on the outer peripheral surface of the insulated rod (3) and the positive and negative poles of the pilot torch A DC voltage is supplied to each of the DC voltages, and the slip rings 4a and 4b are not formed in a drum form as in the prior art but are formed in a rod shape so as to contact the carbon brushes 8 to be described later. It is possible to stably supply current to the pilot torch because it has a surface contact rather than a point contact, thereby preventing arc generation at the contact surface.

Further, the positive and negative voltage supply terminals 7a and 7b are transversely formed on both sides of the center line as shown in FIGS. 4 and 5 (that is, at right angles to the circular slip rings 4a and 4b). Brush and coil spring insertion hole 71 is formed to have a predetermined interval with an insulator (6) between the upper end to the insulated terminal mounting rod (5) installed fixed in the vertical direction to the body (2) The positive and negative voltage supply lines 72 connected to the output terminal of the control unit are fixedly installed, and the coil spring 9 to be described later is fixedly installed.

On the other hand, the positive and negative carbon brush 8 is connected to the positive and negative voltage supply terminals (7a, 7b) detachably connected to the positive and negative voltage supply terminal via a power supply line 81 installed at one end. (7a) (7b) has a configuration that is slidably movable in the brush and the coil spring insertion hole (71), the other end is a cylindrical slip of the positive electrode or the negative electrode at a pressure corresponding to the elastic force of the coil spring (9) Installed in the form of surface contact with the outer circumferential surface of the ring (4a) (4b) performs a function to directly transfer the positive and negative voltage to the positive and negative rod-shaped slip ring (4a) (4b) that rotates with the pilot torch Done.

The coil spring 9 has free ends formed at the positive and negative voltage supply terminals 7a and 7b in a state where the center of one end is fixed to both ends of the positive and negative voltage supply terminals 7a and 7b, respectively. Inserted into a pair of brushes and coil spring insertion hole 71, respectively, to perform a function of generating a continuous elastic force in the positive or negative carbon brush (8), respectively.

At this time, the coil spring 9 has an involute shape, so that the amount of unfolding continues to increase in response to the wear amount of the carbon brush 8, so that the pressure applied to the carbon brush 8 maintains a constant pressure so that the plasma The contact pressure of the carbon brush 8 can be continuously maintained above a certain pressure by the elastic force of the coil spring 9 even if the cutter is used for a long time. Therefore, the reliability of the plasma cutter itself can be greatly improved. will be.

Although the above-described embodiments have been described with respect to the most preferred embodiments of the present invention, it is not limited to the above embodiments, and it is apparent to those skilled in the art that various modifications can be made without departing from the technical spirit of the present invention.

1 is a perspective view of a coupling state of the slip ring and the leaf spring of the conventional plasma cutting machine.

Figure 2 is a cross-sectional view of the coupling side of the slip ring and the leaf spring of the conventional plasma cutting machine.

Figure 3 is a perspective view of the device of the present invention.

4 is a side cross-sectional view of the device of the present invention.

5 is a plan sectional view of the device of the present invention.

Explanation of symbols on the main parts of the drawings

1: rotating rod 2: body

3: insulated rod 4a, 4b: round type slip ring

5: mounting rod 6: insulator

7a, 7b: positive and negative voltage supply terminals

8: anode and cathode carbon brush 9: coil spring

71: brush and coil spring insertion hole 72: positive and negative voltage supply line

81: power line

Claims (1)

A plasma cutting machine having a control unit, a rotatable pilot torch and a main torch, which moves on a large sheet of iron sheet material and automatically cuts a material having a desired shape, An insulated rod installed in the rotary rod of the pilot torch to insulate between the slip rings of the anode and the cathode and the body; A rod-shaped slip ring of positive and negative electrodes which rotates together with the insulating rod and the rotating rod in a fixed state at a predetermined interval on the outer circumferential surface of the insulating rod and supplies a DC voltage to the positive and negative poles of the pilot torch; The output terminal of the control unit is provided with an insulator interposed therebetween with an insulator type terminal rod having a brush and a coil spring insertion hole in a direction perpendicular to the circular slip ring at both sides of the center line and fixed to the body in a vertical direction. A positive and negative voltage supply terminals to which the positive and negative voltage supply lines connected to the fixed line are fixed; The anode or cathode is installed to be slidably movable in the brush and the coil spring insertion hole of the anode and cathode voltage supply terminals while being connected to the anode and cathode voltage supply terminals through a power line. A pair of positive and negative electrode carbon brushes, respectively, which directly transmits an anode voltage and a cathode voltage to the anode and cathode rod-shaped slip rings which rotate in surface contact with the outer circumferential surface of the rod-shaped slip ring; While the centers are fixed to both ends of the positive and negative voltage supply terminals, the free ends are continuously inserted into the brushes and the coil spring insertion holes of the positive and negative voltage supply terminals to generate continuous elastic force in the positive or negative carbon brushes, respectively. Slip ring contact failure prevention device of the plasma cutting machine, characterized in that consisting of a pair of coil springs each.

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