Description

APPARATUS FOR CUTTING H-SHAPED STEEL

Technical Field

[1] The present invention relates to an apparatus for cutting H-shaped steel, and more specifically to an apparatus for cutting H-shaped steel, which mounted in the vertical portion of both sides of H-shaped steel and moving along the vertical portion of H- shaped steel, can cut H-shaped steel vertically and horizontally simultaneously by using a lateral cutting torch and a vertical cutting torch. Background Art

[2] In general, one of the methods for cutting H-shaped steel is the method in which the worker holds the cutting torch and directly cuts the H-shaped steel by hand. But such a method has a disadvantage in that it is not only inconvenient with low work workability but also it is difficult to cut accurately and the cutting surface is not smooth.

[3] Therefore, recently a cutting method using CNC (computer numerical control) is disclosed. An example of an automatic gas cutter is disclosed in Korean Patent Registration No. 610627. This cutter cuts metal plate while a cutting torch is transferred to left or right (i.e. in the widthwise direction) along a second transfer block, which is transferred along a first transfer block forward or backward (i.e. in the lengthwise direction).

[4] However the conventional automatic gas cutter disclosed in the above patent has a disadvantage in that the moving distance is limited when the cutting torch is moved forward or backward. Namely, because the conventional automatic gas cutter does cutting work as it moves forward or backward along the first transfer block, it has a disadvantage that its moving distance is limited due to the length of the first transfer block. Therefore, it has an inconvenience that work has to be done again after the cutter is moved completely when the position of cutting goes beyond the first transfer block. In addition, the conventional automatic gas cutter has a difficulty in cutting H- shaped steel because the torch is not operated vertically, and furthermore it has a disadvantage that it is impossible to cut H-shaped steel obliquely.

Disclosure of Invention

Technical Problem

[5] The present invention is to solve the conventional problems as mentioned above with an object to provide an apparatus for cutting H-shaped steel, which is mounted on the vertical portion on both sides of H-steel and is moved by a wheel driving method along the vertical portion, so that the moving distance is not limited, and it is possible

to cut H-shaped steel both vertically and horizontally by using a lateral cutting torch and a vertical cutting torch, and also oblique cutting is possible. Technical Solution

[6] To achieve the above objects, there is provided an apparatus comprising a CNC device having wheels provided on the bottom rotatable by a drive motor, a drive gear provided on the bottom spaced apart from the wheels and rotatable together with them, and a CNC control unit installed therein; a position control means having a fixed beam mounted on the vertical portion of one side of H-shaped steel movable in the forward or backward direction (lengthwise direction) along the H-shaped steel, a position- adjustable moving beam mounted on the vertical portion of the other side of H-shaped steel opposed to the fixed beam, a pair of guide rods and a power transmission rod arranged in parallel across the fixed beam and the moving beam, and driven wheels fixed at opposite end portions of the power transmission rod and located at the bottoms of the fixed beam and moving beam so as to be rotated by power transmitted through the power transmission rod; a base plate on which said CNC device is mounted in an electrically connected state, and which is installed on the guide rod so as to be able to adjust the position thereof while it is moved in the left or right direction along the guide rod between the fixed beam and moving beam, and on the upper side of which a part of the driven gear fixed on the power transmission rod between the driven wheels is in mesh with the drive gear of the CNC device in an exposed state so as to transmit the power of the drive gear to the driven wheels through the power transmission rod; a lateral guide bar mounted in said CNC device and installed movably in the left or right direction centering on the CNC device; a lateral cutting torch installed on said lateral guide bar to move in the left or right direction along the lateral guide bar for lateral cutting of the H-shaped steel; vertical guide bars arranged opposing each other on the outside of one end of said fixed beam and moving beam respectively; and vertical cutting torches installed on said vertical guide bars to move in the up or down direction along the vertical guide bars for vertical cutting of the H-shaped steel.

[7] Preferably, the fixed beam and the moving beam have mounting slots formed at the bottoms thereof for mounting on the top ends of the vertical portions of H-shaped steel, and the driven wheels fixed at opposite end portions of the power transmission rod are mounted in the mounting slots so as to move the position control means as a whole along the vertical portion of H-shaped steel during rotation of the power transmission rod.

[8] Preferably, the apparatus further comprises brackets rotatably installed by pins on the outside of one end of the fixed beam and moving beam respectively, wherein the vertical guide bars are installed slidably in the up or down direction along each bracket

so as to make up-down movement and rotation of vertical guide bars possible. [9] Preferably, the apparatus further comprises an auxiliary lateral guide bar installed movably in the left or right direction along the lateral guide bar, wherein the lateral cutting torch is installed on the auxiliary lateral guide bar so as to move wider in the lateral direction.

Advantageous Effects

[10] According to the present invention, since the apparatus for cutting H-shaped steel is moved in the forward or backward direction of H-shaped steel by the wheel drive method, cutting work can be done by adjusting the moving distance freely forward or backward without being limited or restricted as in a conventional method. And by adopting the wheel drive method using wheels mounted on the vertical portions of H- shaped steel, the wheels move forward or backward along H-shaped steel, so a separate rail need not be installed on H-shaped steel. In addition, since the present invention can not only cut H-shaped steel by simultaneously using a lateral cutting torch and a vertical cutting torch, but also it is possible to freely adjust the angle of the lateral cutting torch and vertical cutting torch, it is also possible to cut H-shaped steel obliquely. Brief Description of the Drawings

[11] These and other objects, features, aspects, and advantages of preferred embodiments of the present invention will be more fully described in the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:

[12] Fig. 1 is a perspective view showing the separated state of an apparatus for cutting

H-shaped steel according to the present invention;

[13] Fig. 2 is a perspective view showing the assembled state of the apparatus for cutting

H-shaped steel according to the present invention;

[14] Fig. 3 is a perspective view showing the operating state of the apparatus shown in

Fig. 2;

[15] Fig. 4 is a rear perspective view showing only the CNC device separated from the apparatus of the present invention;

[16] Fig. 5 is a perspective view of a guide bar mounting portion of the CNC device as seen from below in the apparatus of the present invention; and

[17] Fig. 6 is a perspective view showing the assembled state of the apparatus for cutting

H-shaped steel according to another embodiment of the present invention.

[18] <Description of Symbols of the Major Parts of the Drawings>

[19] 1: H-shaped steel, Ia; horizontal portion, Ib: vertical portion; 100: CNC device,

102: wheel, 104: drive gear, 200: base plate, 202: driven gear, 300: fixed beam, 302:

mounting slot, 310: moving beam, 312: mounting slot, 320: guide rod, 330: power transmission rod, 400: lateral guide bar, 410: auxiliary lateral guide bar, 500: lateral cutting torch, 600: vertical guide bar, 700: vertical cutting torch Best Mode for Carrying Out the Invention

[20] Below will be described in detail the present invention with reference to the accompanying drawings.

[21] Fig. 1 is a perspective view showing the separated state of an apparatus for cutting

H-shaped steel according to the present invention, Fig. 2 is a perspective view showing the assembled state of the apparatus for cutting H-shaped steel according to the present invention, Fig. 3 is a perspective view showing the operating state of the apparatus shown in Fig. 2, Fig. 4 is a rear perspective view showing only the CNC device separated from the apparatus of the present invention, Fig. 5 is a perspective view of a guide bar mounting portion of the CNC device as seen from below in the apparatus of the present invention, and Fig. 6 is a perspective view showing the assembled state of the apparatus for cutting H-shaped steel according to another embodiment of the present invention.

[22] Referring to Figs. 1 to 5, the apparatus for cutting H-shaped steel according to the present invention comprises a CNC device 100. The CNC device 100 located on a base plate 200 includes a position control means installed movably in the forward or backward direction (lengthwise direction) on the H-shaped steel 1. On the front of the CNC device 100 is installed a lateral cutting torch 500 movable in the left or right direction (widthwise direction) along a horizontal (i.e. left-right) guide bar 400. On both sides of the position control means are installed vertical cutting torches 700, which are movably mounted in the up or down direction (vertical direction) along vertical (i.e. up-down) guide bars 600.

[23] The CNC device 100 includes a CNC control unit (not shown) therein, and a plurality of buttons B for inputting control signals (program) and a display panel D for displaying control signals on the exterior thereof. On the bottom of the CNC device 100 according to the present invention are installed wheels 102 that are rotated by power transmitted from a drive motor (not shown). These wheels 102 are mainly used in case of cutting a steel plate. On the bottom of the CNC device 100 is installed rotatably a drive gear 104 together with the wheel 102. At this time, it is preferable that the drive gear 104 installed on one side of the wheel 102 is configured so as to operate as one unit with the wheel 102, but it may be configured so as to operate separately. Here, for the method of driving the wheel 102 by a drive motor (not shown), it is possible to apply any method known in art. For example, a two-way rotatable motor can be used to transmit power directly to the wheel, or power can be transmitted to the

wheel through an intermediate gear.

[24] The H- shaped steel 1 has a structure in which a horizontal portion Ia and vertical portions Ib on both sides of the horizontal portion Ia are formed as one unit. The position control means is installed on the H-shaped steel movably in the forward or backward direction along the H-shaped steel 1. This means comprises a fixed beam 300 mounted on the vertical portion of one side of the H-shaped steel, a moving beam 310 mounted on the vertical portion of the other side of the H-shaped steel opposed to the fixed beam 300, and a pair of guide rods 320 and a power transmission rod 330 arranged in parallel across the beams. One end of the guide rods 320 or the power transmission rod 330 is fixed to the fixed beam 300, and the other end is slidably installed through the moving beam 310 to make it possible to adjust the position by moving to the left or right along the guide rods 320 and the power transmission rod 330. And on the bottoms of the fixed beam 300 and the moving beam 310 are formed mounting slots 302 and 312 into which the top ends of the vertical portions Ib of H- shaped steel 1 are fitted. Two driven wheels 332 are fixed at opposite end portions of the power transmission rod 330, and installed in the mounting slots 302 in a partly exposed state. The driven wheels 332 are rotated by the power transmitted from the drive motor through the power transmission rod 330. The position control means configured like above can adjust the width by moving the moving beam 310 left or right according to the size of H-shaped steel 1 as shown in Figs. 2 and 3.

[25] The base plate 200 is installed in such a way that it can adjust the position by moving in the left or right direction along the guide rod 320 between fixed beam 300 and moving beam 310. The CNC device 100 is mounted on the base plate 200 such that they are electrically connected to each other through a connection terminal 112 and socket 204 to make it possible to send and receive signals. And a part of a driven gear 202 is exposed on the upper side of the base plate 200 so as to be in mesh with the drive gear 104 of the CNC device 100 during assembly. The driven gear 202 is fixed on the power transmission rod 330 between the driven wheels 332. Accordingly, it is configured in such a way that the power of the drive gear 104 is transmitted to the power transmission rod 330 through the driven gear 202 to rotate the driven wheels 332 fixed at opposite end portions of the power transmission rod 330. Meanwhile, a cable socket 340 is installed between the fixed beam 300 and moving beam 310 so as to pass through the base plate 200, and electric wire is provided in the cable socket 340 to transmit electrical signals.

[26] The lateral guide bar 400 is mounted on the front side of the CNC device 100 and installed movably to the left or right of the centering on the CNC device 100. Namely, on the front side of the CNC device 100 is formed a guide bar mounting portion 106, into which the lateral guide bar 400 is assembled. And on the upper side of the lateral

guide bar 400 is fixed a rack gear 402 lengthwise, and above the guide bar mounting portion 106 of the CNC device 100 is installed a pinion gear 108 corresponding to the rack gear 402 rotatable by a motor (not shown). Therefore, when the pinion gear 108 is rotated by operation of the motor, the rack gear 402 in mesh with the pinion gear 108 is moved so as to move the lateral guide bar 400 left or right centering on the CNC device 100. Also, in the upper and lower portions of the guide bar mounting portion 106 of the CNC device 100 are rotatably installed a plurality of rollers 110 for the lateral guide bar 400 to move smoothly. On the other hand, only one lateral guide bar 400 is installed in this embodiment, but an auxiliary lateral guide bar 410 can be mounted on the front of the lateral guide bar 400 as shown in Fig. 6. Since an auxiliary lateral guide bar 410 is additionally installed movably in the left or right direction along the lateral guide bar 400 like this, it is possible to utilize to a larger width by extending the whole length of the guide bar in the lateral direction.

[27] The lateral cutting torch 500 is installed on front side of the lateral guide bar 400 such that it is moveable to the left or right along the lateral guide bar 400. For reference, in case there is an auxiliary guide bar 410 as shown in Fig. 6, it is preferable to install a lateral cutting torch 500 on the auxiliary lateral guide bar 410. At this time, the lateral cutting torch 500 is configured in such a way that it is possible to adjust the angle thereof as well as move in the left or right direction along the lateral guide bar 400. Namely, the lateral cutting torch 500 is installed at lower end of a torch support 510, and on the lateral guide bar 400 is installed a moving plate 520 movable to the left or right along the lateral guide bar 400. The torch support 510 is combined to the moving plate 520 by a pin P and installed rotatably centering on pin P. In addition, on the upper side of the moving plate 520 is marked an angle marking graduation 522, and on the torch support 510 is marked an index line 512 for indicating the angle of the angle marking graduation 522 so as to easily confirm the angle of rotation. For the method of driving the moving plate 520 left or right along the lateral guide bar 400, any method known in art can be applied. For example, a timing belt may be installed inside the lateral guide bar 400 wherein one end of the timing belt is connected to the moving plate 520 and the other end of the timing belt is connected to a flat gear combined with a motor. Accordingly, when the flat gear is rotated by the motor, the timing belt is rotated and circulated in the normal or reverse direction according to the rotation direction of the motor so as to move the moving plate 520 connected to the timing belt left or right.

[28] Each one end of the fixed beam 300 and the moving beam 310 are connected to the vertical guide bars 600 opposing each other by brackets 610. Namely, on the outside of each one end of the fixed beam 300 and the moving beam 310 are rotatably installed brackets 610 by pins P, and inside these brackets 610 are installed vertical guide bars

600 slidably upward and downward along the brackets. Accordingly, the vertical guide bars 600 can be moved up or down along the brackets 610, and if necessary, the brackets can be rotated centering on the pin P. Of course, each vertical guide bar 600 has bolt B installed on one side of the bracket 610 so as to fix the bracket after the positions of the brackets 610 are adjusted. Accordingly, it is possible to press and fix the vertical guide bar 600 by tightening the bolt.

[29] The vertical cutting torch 700 is installed on the vertical guide bar 600, and is installed movably upward or downward along the vertical guide bar 600. And the vertical cutting torch 700 is installed movably upward or downward on the vertical guide bar 600 through the torch support 710, and the portion connected with the torch support 710 is combined with a hinge so as to make angle adjustment possible. Here, any method known in art can be applied to the driving method for moving the torch support 710 along the vertical guide bar 600. For example, as mentioned above, a timing belt and flat gear can be installed inside the vertical guide bar 600 for driving the torch support.

[30] Assembly and operation of the present invention configured like above will be described. In the present invention, the fixed beam 300 and the moving beam 310 are mounted on the vertical portion Ib of H-shaped steel 1 through the mounting slots 302 and 312, with the position of the moving beam 310 adjusted to the width of the H- shaped steel 1 using the pinion gear 108 and rack gear 402. Next, the CNC device 100 is placed on the base plate 200. At this time, the CNC device 100 and the base plate 200 are electrically connected to each other by connection of the connection terminal 112 and socket 204. When power is supplied to the CNC for operating, the drive gear 104 is rotated together with the wheels 102 of the CNC device 100 by motor according to the inputted program to rotate the driven gear 202 installed on the base plate 200, and the power transmission rod 330 is rotated by rotation of the driven gear 202. Then the driven wheel 332 installed on the power transmission rod 330 is rotated to move th e position control means as a whole forward or backward along the vertical portion Ib of the H-shaped steel 1 so as to move to the programmed position. Next, the lateral cutting torch 700 moves left or right along the lateral guide bar 400 to cut H-shaped steel 1 horizontally, and the vertical cutting torch 700 moves up or down along the vertical guide bar 600 to cut H-shaped steel 1 vertically. Of course, the lateral guide bar 400 moves left or right centering on the CNC device 100 as necessary to help with the lateral cutting torch 500 cutting work.

[31] Meanwhile, the present invention can also be used as a flat plate cutting apparatus for cutting flat plate (steel plate) instead of H-shaped steel by separating and using only the CNC device, the lateral guide bar and lateral cutting torch.

Industrial Applicability

[32] The apparatus for cutting H-shaped steel according to the present invention can be usefully applied to cutting H-shaped steel.

[33] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, well- known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail, and therefore, a detailed description thereof will be omitted.