JP2015227535A - Rail cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rail cutting device capable of surely and accurately making a notch position by gas cutting from three-way coincide, capable of easily, quickly and efficiently executing cutting work without requiring skill, and capable of dispensing with even grinding work for correction without causing a step difference and an angle difference on a cutting surface, as the cutting device of a rail.SOLUTION: A rail cutting device is constituted of a torch support frame body 1 straddlingly fitted to a rail R and a gas cutting torch 2. The torch support frame body 1 comprises a rail abutting frame part 4, a clamp arm 5 and an operation screw shaft 6 push-contacted with the rail R on the rear surface 10b side, by projecting torch installing parts 3A-3C on the upper side and both left-right sides of a front face 10a of a vertical plate part 10. A head part 21 of the gas cutting torch 2 comprises a pivotal shaft 7 rotatably inserted into/fitted to a torch holding hole 31 of the respective torch installing parts 3A-3C. The rail R is sandwiched by the rail abutting frame part 4 and the clamp arm 5 of the torch support frame body 1, and a head part 21 of the gas cutting torch 2 is successively installed and rotatably operated in the torch installing parts 3A-3C, and thereby, the rail R is cut by gas by cutting in from the three-way.

Description

  The present invention relates to a rail cutting device used for gas cutting rails constituting various traveling rails including railroad tracks.

  Generally, on railroad tracks, when a new line is laid or connected, a partial repair or regular replacement of an existing line is performed, the rail is cut and welded at a construction site. As this rail cutting method, a gas cutting method and a cutter cutting method are known, but in the cutter cutting method, a circular saw type cutting device that is structurally complicated and expensive including a clamp mechanism (for example, Patent Documents 1 and 2). On the other hand, the gas cutting method has been widely used since the rail can be easily blown by manual operation of the gas cutting torch.

  And in the gas cutting method, the rail has a cross-sectional shape in which a thick head is integrated on an inverted T-shaped leg having a wide lower end width, and it is difficult to melt the entire rail by flame injection from one direction. Therefore, it is common to cut the rail from three directions and blow it out in three stages by changing the flame injection direction from the left and right sides and from the upper side in order to one cutting position. It is.

JP 05-303002 A JP 2013-513041 A

  However, in conventional gas cutting, the gas cutting torch is manually moved along the cutting line in each of the three stages of cutting operations, so it is difficult to precisely align the cutting positions from the three directions, making it highly sophisticated in cutting work. Requires a lot of skill and time, and the work efficiency is poor, and there are many steps and angle differences between the cut surfaces due to the cutting from three directions. There has been a problem of being forced to perform a grinding process.

  In view of the above-described circumstances, the present invention is a gas cutting system that performs cutting from three directions as a rail cutting device that constitutes various traveling rails including railroad vehicle tracks. The position can be matched accurately and accurately, and it can be cut easily, quickly and efficiently without skill, and there is no step or angle difference on the cut surface. It aims to provide things that are no longer necessary.

  If the means for achieving the above object is shown with reference numerals in the drawings, the rail cutting device according to the invention of claim 1 includes a torch support frame body 1 that is fitted over and fixed to the rail R, and the torch. It comprises a gas cutting torch 2 that detachably supports the head portion 21 on the support frame 1, and the torch support frame 1 has a vertical plate portion 10 having a notch portion 11 for straddling the rail R, and The torch mounting portions 3A to 3C projecting from the front surface 10a side of the vertical plate portion 10 on the upper side of the notch portion 11 and the left and right sides, and the rear surface 10b side of the vertical plate portion 10 projecting from the rail R A rail abutment frame portion 4 that abuts on the top surface Ra and one side surface (left side surface) Rb, and a distal end pivotally attached to the other side surface (right side surface) Rc of the rail R so as to be able to rotate in a contact / separation direction. The clamp arm 5 and the tip (lower end) 5a side of the clamp arm 5 are And a pressing means (operation screw shaft 6) that presses against the other side surface Rc of the cylinder R, each of the torch mounting portions 3A to 3C has a torch holding hole 31 that opens forward, and a head portion of the gas cutting torch 2 21, a pivot shaft 7 that can be rotatably inserted into the torch holding hole 31 is projected in a direction orthogonal to the flame F emission direction, and the vertical plate portion of the torch support frame 1 is mounted on the rail R to be cut. 10, and the torch support body 1 is fixed by sandwiching the rail R between the rail contact frame portion 4 and the tip 5 a side of the clamp arm 5. The head R 21 of the gas cutting torch 2 is sequentially attached to the torch mounting portions 3A to 3C via the pivot shaft 7 and is rotated so that the rail R is gas-cut from three directions. Become.

  According to a second aspect of the present invention, in the rail cutting device according to the first aspect, a bearing 32 is fitted on the inner periphery of the torch holding hole 31 of each of the torch mounting portions 3A to 3C.

  The invention of claim 3 is the rail cutting device according to claim 1 or 2, further comprising a cap 8 that closes the torch holding hole 31 of the torch mounting portions 3A to 3C, and the head portion of the gas cutting torch 2 when the rail R is gas cut. The cap 8 is configured to be fitted to the torch mounting portions 3A to 3C to which 21 is not mounted.

  According to a fourth aspect of the present invention, in the rail cutting device according to any one of the first to third aspects, the torch attachment portions 3A to 3C and the cap 8 are made of a magnetic metal, and the cap 8 is attached by a magnet 81 attached to the cap 8 side. It is comprised so that magnetic force adsorption | suction may be carried out to the front-end part 3a of torch attachment part 3A-3C.

  According to a fifth aspect of the present invention, in the rail cutting device according to any one of the first to fourth aspects, the clamp arm 5 is pivotally attached to the rail contact frame portion 4 via the pivot pin 9 so as to be pivotable in the vertical direction. At the same time, a screw cylinder 51 is provided at an end (upper end) 5b opposite to the tip (lower end 5a) side of the clamp arm 5 which is pressed against the rail R, with the pivot pin 9 interposed therebetween. The means comprises an operation screw shaft 6 that is screwed onto the screw cylinder portion 51 and abuts the tip 6a against the rail contact frame portion 4. The clamp arm 5 is configured to rotate by rotation of the operation screw shaft 6. It becomes.

  Next, effects of the present invention will be described with reference numerals in the drawings. First, according to the rail cutting device according to the first aspect of the present invention, the longitudinal plate portion 10 of the torch support frame body 1 is straddled on the rail R to be cut at the notch portion 11, and the rail contact frame portion 4 and the clamp arm 5 to fix the torch support 1 by sandwiching the rail R between the front end 5a side and the torch holding portions 3A to 3C on the upper and left and right sides of the vertical plate portion 10. A pivot shaft 7 provided on the head portion 21 of the gas cutting torch 2 can be rotatably inserted into the hole 31. Since the pivot shaft 7 protrudes in a direction orthogonal to the flame F emission direction of the gas cutting torch 2, the head portion 21 of the gas cutting torch 2 is sequentially pivoted to the three torch mounting portions 3A to 3C. By attaching the support shaft 7 and rotating the head portion 21 respectively, the rail R can be cut from three directions and gas can be easily cut. Since the head part 21 can be easily attached to and detached from 3A to 3C, the cutting operation can be performed quickly and efficiently. Moreover, since the holding position of the head portion 21 is automatically determined at the same position in the rail longitudinal direction in the three torch mounting portions 3A to 3C, the incision positions from the three directions are accurately matched, and in addition, the flame from the three directions Since the trajectory of radiation falls within a plane perpendicular to the longitudinal direction of the rail R, there is no level difference or angular difference in the cut surface, and conventional post-cutting grinding for correction as in the prior art becomes unnecessary.

  On the other hand, the torch support frame body 1 in this rail cutting device is provided with the torch mounting portions 3A to 3C on the front surface 10a side of the vertical plate portion 10 having the notches 11, and the rail contact frame portion 4 and the clamp on the rear surface 10b side. Since it has a simple structure with only the arm 5 and its pressing means (operation screw shaft 6), it can be manufactured easily and inexpensively, and it is difficult to break down, has excellent durability, and is lightweight. There is an advantage that it can be easily handled and carried.

  According to the invention of claim 2, since the bearing 32 is fitted on the inner periphery of the torch holding hole 31 of each of the torch mounting portions 3 </ b> A to 3 </ b> C, the pivot shaft 21 is inserted into the torch holding hole 31. As a result, the head portion 21 of the gas cutting torch 2 can be smoothly rotated, so that the accuracy of rail cutting and the work efficiency are further improved.

  According to the invention of claim 3, when the rail R is sequentially cut by gas cutting from three directions, the head portion 21 of the gas cutting torch 2 is not mounted among the three torch mounting portions 3A to 3C. By fitting the caps 8 at two unused locations, it is possible to prevent the slag scattered from the cut site from adhering to the inside of the torch holding holes 31 and the front end portion 3a of the two torch mounting portions. Therefore, when these two torch attachment portions are used next time, the holding position and holding posture of the head portion 21 of the gas cutting torch 2 due to adhering slag are avoided, and high cutting accuracy can be secured.

  According to the invention of claim 4, since the cap 8 is configured to magnetically attract to the front end portions 3a of the torch mounting portions 3A to 3C by the magnet 80, when the rail R is sequentially gas-cut from three directions, the torch The cap 8 can be easily and quickly replaced between the mounting portions 3A to 3C, and the cutting efficiency is further improved.

  According to the invention of claim 5, the clamp arm 5 is pivotally attached to the rail contact frame portion 4 via the pivot pin 9 so as to be pivotable in the vertical direction, and the pressing means is a screw cylinder of the clamp arm 5. Since the operation screw shaft 6 is screwed to the portion 51 and abuts the tip 6a against the rail abutment frame portion 4, the distal end 5a side of the clamp arm 5 is moved to the other side of the rail R by rotating the operation screw shaft 6. While strongly pressing against the side surface Rc, the torch support frame 1 can be securely fixed to the rail R, and this fixed state can be easily released.

It is a perspective view of a rail cutting device concerning one embodiment of the present invention. It is a disassembled perspective view of the torch support frame of the rail cutting device. It is a side view of the torch support frame. It is a vertical side view which shows the torch attachment part and cap of the torch support frame. It is a vertical front view which shows the attachment state with respect to the rail of the torch support frame. It is a vertical rear view which shows the attachment state with respect to the rail of the torch support frame. It is a principal part fracture side view showing the state where the head part of the gas cutting torch was attached to the torch attachment part of the torch support frame. It is a longitudinal front view which shows the 1st step of the rail cutting by the rail cutting device. It is a vertical front view which shows the 2nd step of the rail cutting by the rail cutting device. It is a vertical front view which shows the 3rd step of the rail cutting by the rail cutting device.

  Hereinafter, a rail cutting device according to an embodiment of the present invention will be specifically described with reference to the drawings. This rail cutting device is for railroad rail cutting, and comprises a torch support frame 1 and a gas cutting torch 2 shown in FIG.

  As shown in FIGS. 1 to 3, 5, and 6, the torch support frame 1 is formed on the front surface 10 a side of the vertical plate portion 10 that has a notch portion 11 that opens downward in a substantially square shape, and is located above the notch portion 11. Cylindrical torch mounting portions 3A to 3C are provided at three positions on the left side and the left and right sides, and the upper plate portion 41 and the side plate portion 42 are L-shaped on the rear surface 10b side of the vertical plate portion 10. A rail contact frame portion 4 having a frame shape is provided so as to extend from the upper edge to the upper left edge of the notch portion 11. And the two caps 8 shared with the three torch attachment parts 3A-3C are attached. In addition, a pair of bracket portions 43, 43 are provided on the rail abutting frame portion 4 on both the front and rear sides of the right end of the upper plate portion 41 so as to project upward, and via a pivot pin 9 bridged between the bracket portions 43, 43. Thus, the arc-shaped clamp arm 5 is pivotally supported at a position close to the upper portion so as to be rotatable in the vertical direction, and the operation screw shaft 6 is screwed onto the screw cylinder portion 51 provided on the upper end portion 5b of the clamp arm 5 from above. The lower end 6 a of the operation screw shaft 6 is in contact with the upper surface 4 a of the upper plate portion 41 of the rail contact frame portion 4.

  A hand grip 12 is fixed to the upper end of the vertical plate portion 10, and a handle portion 6 b for twisting is provided on the upper end of the operation screw shaft 6. The vertical plate portion 10, the torch mounting portions 3A to 3C, the rail contact frame portion 4, the clamp arm 5, the operation screw shaft 6, and the cap 8 are all made of steel, and the rail contact frame portion 4 is a vertical plate portion. 10 is welded.

  The torch mounting portions 3A to 3C have the same size and shape, and as shown in FIGS. 2 to 4, each has a bolt portion 33 protruding rearward from the center of the rear end of the cylindrical main body 30, and the bolt The part 33 is inserted into a bolt insertion hole 13 provided in the vertical plate part 10 and is fastened to the vertical plate part 10 by screwing and tightening a thumbscrew 34 from the rear. Each cylindrical main body 30 has a torch holding hole 31 that opens forward, and three bearings 32 are fitted in the torch holding hole 31 through a snap ring 33 so that they cannot be removed. . In addition, as shown in FIG. 2, two bolt insertion holes 13 are provided on the left and right side lower portions of the vertical plate portion 10 respectively, and the left and right torch mounting portions 3B, 3C according to the size of the rail to be cut. The stop position of can be changed up and down.

  As shown in FIG. 4, the cap 8 is composed of a circular base wall portion 8a and a peripheral wall portion 8b. A circular convex portion 8c is integrally formed on the inner surface side of the base wall portion 8a, and the circular convex portion 8c. A ring-shaped magnet 80 is fitted between the peripheral wall portion 8b and the peripheral wall portion 8b. The end face of the fitted magnet 80 is lower than the end edge of the peripheral wall portion 8b, and the inner diameter of the peripheral wall portion 8b is set slightly larger than the outer diameter of the cylindrical body 30 of the torch attachment portions 3A to 3C. As shown by phantom lines in FIG. 4, when the cap 8 is fitted to the torch mounting portions 3A to 3C, the magnet 80 is magnetically attracted to the front end surface 3a, and the peripheral wall portion 8b is the cylindrical main body 30. It fits outside.

  As shown in FIGS. 3 and 5, the rail contact frame portion 4 bulges downward in the front and rear side portions on the lower surface side of the upper plate portion 41 and is slightly lower than the upper edge of the notch portion 11 of the vertical plate portion 10. The rail upper surface abutting portions 41a and 41a are configured, and the lower edge side of the side plate portion 42 also bulges slightly inward from the left edge of the notch 11, and the inner surface of the rail side surface abuts the vertical surface over the entire length in the front-rear direction. Part 42a is configured. The pivot pin 9 has a cylindrical boss portion 52 protruding from both sides of the clamp arm 5 between the bracket portions 43 and 43 of the rail abutting frame portion 4. The pin is inserted into the pin insertion hole 43a (see FIG. 2) and the boss portion 52, and is screwed into the screw hole 43b opened at the upper end of the rear bracket portion 43 in the flat portion 9a provided on the peripheral surface of the rear portion. By pressing the lock screw 45, it is held so that it cannot be pulled out rearward.

  On the other hand, as shown in FIG. 1, the gas cutting torch 2 has a cylindrical head portion 21 with a crater nozzle 2a protruding on one end side connected to a fuel gas supply pipe 22 and an oxygen supply pipe 23 at a substantially right angle. The pivot shaft 7 is projected from the head portion 21 through the attachment frame 70 in a direction orthogonal to the flame emission direction of the crater nozzle 2a and in the direction opposite to the length direction of the fuel gas supply pipe 22 and the oxygen supply pipe 23. ing. The pivot shaft 7 is set to have a diameter that fits properly in the torch holding holes 31 of the torch mounting portions 3 </ b> A to 3 </ b> C, that is, the inner periphery of the bearing 32.

  The mounting frame 70 is formed by externally fitting a cleavage cylinder portion 71 on one end side to the head portion 21, and screwing and tightening a wing screw 74 to a bolt 73 that is passed between projecting pieces 71a and 71a projecting on both sides of the cleavage. Thus, the head portion 21 is fixed. A disk portion 72 is fixedly welded to the other end of the mounting frame 70 near the crater nozzle 2a, and the pivot shaft 7 is fixed concentrically to the disk portion 72. The oxygen supply pipe 23 is branched into a cutting oxygen supply pipe 23a and a preheating oxygen supply pipe 23b. The cutting oxygen supply pipe 23a is provided with a lever-type opening / closing valve 24 and is used for preheating. The oxygen supply pipe 23b and the fuel gas supply pipe 22 are provided with a screw-type flow rate adjustment valve 25.

  In order to cut a railroad rail by the rail cutting device having the above-described configuration, as shown in FIGS. 5 and 6, first, the torch support frame body 1 is moved from above to the notch portion 11 of the vertical plate portion 10 with respect to the rail R. R is straddled so that R is inserted, and the rail upper surface contact portions 41a, 41a of the rail contact frame portion 4 are placed on the rail R. At this time, the clamp arm 5 is in a state in which the lower end 5 a is retracted to the right side of the notch portion 11 by previously reducing the degree of screwing of the operation screw shaft 6 with respect to the screw cylinder portion 51. As shown in the figure, the rail R is composed of a thick head R1, a thin vertical plate-like leg R2, and a wide bottom plate R3. The torch support frame 1 straddling the rail R has a notch portion. With the depth setting of 11, the vertical plate portion 10 is in a state of being lifted away from the bottom plate portion R3 of the rail R.

  Thus, after the torch support frame 1 is fitted over the rail R, the operating screw shaft 6 is rotated in the direction in which the threading degree is deepened, thereby rotating the clamp arm 5 in the clamping direction, and its lower end 5a. Is pressed against the right side surface Rc of the rail R. As a result of this pressing, the left side surface Rb of the head portion R1 of the rail R presses against the rail side surface contact portion 42a of the rail contact frame portion 4, and the rail side surface contact portion 42a and the lower end 5a of the clamp arm 5 are in contact with each other. The torch support frame 1 is fixed to the rail R by sandwiching the rail R therebetween. In this fixed state, the rail contact frame portion 4 protruding rearward from the vertical plate portion 10 makes surface contact or line contact with the left side surface Rb of the head R1 of the rail R at the rail side surface contact portion 42a. In addition, since the rail upper surface abutting portions 41a and 41a abut against the upper surface Ra of the head R1, the vertical plate portion 10 is securely held in a vertical posture in which the surface direction is orthogonal to the rail longitudinal direction. Is done.

  Next, the gas cutting torch 2 is sequentially attached to the three torch attachment portions 3A to 3C of the torch support frame 1 fixed to the rail R, and a three-stage gas cutting operation is performed. The order of the three-stage gas cutting operation is not particularly limited, but in the following, the right-side torch attachment portion 3C in the first stage, the left-side torch attachment portion 3B in the second stage, and the upper torch attachment portion in the third stage. A description will be given assuming that 3A is used.

  As shown in FIG. 7, the gas cutting torch 2 is attached to the torch support frame 1 only by inserting the pivot shaft 7 of the head portion 21 to the base end in the torch holding holes 31 of the torch attaching portions 3A to 3C. It's okay. As a result, the annular step portion 7a around the base end of the pivot shaft 7 comes into contact with the end face of the outermost bearing 32, so that the head portion 21 is rotatably held in a state where it is positioned in the front-rear direction. In this attached state, since the axial direction of the pivot shaft 7 is orthogonal to the flame emission direction of the crater nozzle 2a, the locus of the flame radiation from the crater nozzle 2a accompanying the rotation of the head portion 21 is relative to the rotation axis. And move along a plane orthogonal to each other.

  In the first-stage gas cutting operation, as shown in FIG. 8, the head portion 21 of the gas cutting torch 2 is mounted on the right side torch mounting portion 3C of the torch support frame 1, and the other torch mounting portions 3A and 3B are mounted. A cap 8 is fitted in the case. Then, the crater nozzle 2a of the head portion 21 from the downward posture as shown in the phantom line is approximately 45 ° from the downward posture to the posture in which the crater nozzle 2a is inclined downward to the left as shown in the solid line while injecting the flame F. By turning right, the right half of the bottom plate R3 of the rail R is cut. Next, the cap 8 of the left torch attachment portion 3B is removed, and the head portion 21 extracted from the right torch attachment portion 3C is attached to the left torch attachment portion 3B, and the removed cap is fitted to the right torch attachment portion 3C. To wear. Then, as a second-stage gas cutting operation, as shown in FIG. 9, the flame 21 is moved from the posture in which the crater nozzle 2a is directed downward as shown in the phantom line to the posture in which the crater nozzle 2a is directed upward to the right as shown in the illustrated solid line. By turning left approximately 70 ° while spraying, the left half of the bottom plate R3 of the rail R is cut from the left half to the top of the leg R2. Thereafter, similarly, the cap 8 of the upper torch mounting portion 3A is removed and the head portion 21 is mounted, and the cap is fitted to the left torch mounting portion 3B. As shown in FIG. 10, the head 21 is turned approximately 45 ° to the left while the flame F is jetted from the posture in which the crater nozzle 2 a is downward as shown by the solid line to the posture in which the crater nozzle 2 a is inclined downward to the right as shown in the virtual line. The cutting of the rail R is completed by fusing the remaining head R1.

  In such gas cutting, since the holding position of the head portion 21 of the gas cutting torch 2 is automatically determined at the same position in the rail longitudinal direction in the three torch mounting portions 3A to 3C, the cutting positions from the three directions are accurate. In addition, since the trajectory of the flame radiation from the three directions fits in the plane perpendicular to the rail longitudinal direction, there is no step or angle difference on the cut surface, and post-cut grinding for correction as before Is also unnecessary. Moreover, the gas cutting torch 2 can be replaced between the torch mounting portions 3A to 3C only by inserting and removing the pivot shaft 7 of the head portion 21 with respect to the torch holding hole 31 of the torch mounting portions 3A to 3C. Since the operation can be performed very quickly, the time loss during the sequential transition of the three torch mounting portions 3A to 3C is extremely reduced, and the cutting efficiency is remarkably improved as compared with the conventional case.

  Moreover, the gas cutting in each torch attachment part 3A-3C only needs to rotate the head part 21 of the gas cutting torch 2, and includes the replacement of the gas cutting torch 2 between the torch attachment parts 3A-3C, It is extremely easy to operate and does not require skill in the work. In particular, in the configuration in which the bearing 32 is fitted in the torch holding holes 31 of the torch mounting portions 3A to 3C as in the embodiment, the head portion 21 can be smoothly rotated, so that the rail cutting accuracy and work efficiency are further improved. improves.

  Further, as in the embodiment, when the rail R is sequentially cut by gas cutting from three directions, the head portion 21 of the gas cutting torch 2 is not mounted among the three torch mounting portions 3A to 3C. If it is set as the structure which attaches the cap 8 to two places of use, it can prevent that the slag which scatters from a cutting | disconnection site | part adheres in the torch holding hole 31 of the two torch attachment parts, or the front-end part 3a. Therefore, when these two torch attachment portions are used next time, the holding position and holding posture of the head portion 21 of the gas cutting torch 2 due to adhering slag are avoided, and high cutting accuracy can be secured. In addition, as illustrated in the embodiment, when the cap 8 is magnetically attracted to the front end portions 3a of the torch mounting portions 3A to 3C by the magnet 80, the rail R is sequentially gas-cut from three directions. The cap 8 can be easily and quickly replaced between the torch mounting portions 3A to 3C, and the cutting efficiency is further improved.

  On the other hand, the torch support frame body 1 in this rail cutting device is provided with the torch mounting portions 3A to 3C on the front surface 10a side of the vertical plate portion 10 having the notches 11, and the rail contact frame portion 4 and the clamp on the rear surface 10b side. Since it has a simple structure with only the pressing means such as the arm 5 and the operation screw shaft 6, it can be manufactured easily and inexpensively, and it is difficult to break down and has excellent durability and light weight. There is an advantage that it can be easily handled and carried.

  In the embodiment, the configuration in which the clamp arm 5 is rotated in the vertical direction is illustrated. However, the clamp arm 5 only needs to be able to rotate in the contact / separation direction with respect to the side surface of the rail R. A configuration that rotates in the (horizontal direction) can also be employed. In addition, when the clamp arm 5 is pressed against the rail R, various pressing means other than the illustrated operation screw shaft 6 can be employed. However, as in the embodiment, the clamp arm 5 is pivotally attached to the rail contact frame portion 4 via the pivot pin 9 so as to be pivotable in the vertical direction, and the operation screw shaft 6 is screwed to the screw cylinder portion 51. In the configuration in which the tip 6a of the arm is in contact with the rail abutment frame portion 4, the tip 5a of the clamp arm 5 is strongly pressed against the other side surface Rc of the rail R by rotating the operation screw shaft 6, thereby supporting the torch. There is an advantage that the frame 1 can be reliably fixed to the rail R and the fixed state can be easily released.

  The rail cutting device of the present invention is not limited to the cutting of the exemplified railroad rail, but can be used for gas cutting of rails constituting various traveling rails including a hanger rail. Further, the rail R to be cut may be disposed with the head R1 facing sideways or downward, in addition to the rail R1 disposed with the head R1 facing upward. Therefore, the notch portion 11 of the vertical plate portion 10 in the torch support frame body 1 may be set to a shape and a dimension capable of straddling the rail according to the cross-sectional shape and size of the rail to be applied. Furthermore, the material of each constituent member of the torch support frame 1 is not limited to the exemplified steel, and various metals and ceramics can be adopted. However, in the configuration in which the cap 8 is magnetically adsorbed via the magnet 80, the cap 8 and the torch are attached. It is necessary to use a magnetic metal for the portions 3A to 3C. In addition, as the rail cutting device of the present invention, the shape of the vertical plate portion 10 and the rail contact frame portion 4 in the torch support frame 1, the fastening structure of the torch attachment portions 3 </ b> A to 3 </ b> C to the vertical plate portion 10, the clamp arm 5 In addition to the embodiment, various design changes can be made to the detailed configuration such as the shape and the pivot structure, and the mounting structure of the pivot shaft 7 to the head portion 21 of the gas cutting torch 2.

DESCRIPTION OF SYMBOLS 1 Torch support frame 10 Vertical plate part 10a Front surface 10b Rear surface 11 Notch part 2 Gas cutting torch 21 Head part 3A-3C Torch attachment part 3a Front end part 31 Torch holding hole 32 Bearing 4 Rail contact frame part 5 Clamp arm 5a Lower end ( tip)
51 Screw cylinder 6 Operation screw shaft (pressing means)
7 pivot shaft 8 cap 80 magnet 9 pivot pin F flame R rail Ra upper surface Rb left side (one side)
Rc Right side (other side)

Claims (5)

It is composed of a torch support frame that is fitted over and fixed to the rail, and a gas cutting torch that removably supports the head portion on the torch support frame,
The torch support frame includes a vertical plate portion having a cutout portion for straddling the rail, and a torch attachment portion projecting from the front surface side of the vertical plate portion at the upper side of the cutout portion and the left and right sides. A rail abutting frame that protrudes from the rear surface of the vertical plate and abuts against the top surface and one side surface of the rail; A clamp arm pivotally attached, and a pressing means for pressing the tip side of the clamp arm against the other side surface of the rail;
Each of the torch mounting portions has a torch holding hole that opens forward, and a pivot shaft that can be rotatably inserted into the torch holding hole is orthogonal to the flame emitting direction in the head portion of the gas cutting torch. Projecting in the direction,
The torch support is fixed by placing the vertical plate portion of the torch support frame over the rail to be cut and sandwiching the rail between the rail abutment frame and the tip side of the clamp arm. Then, the rail is gas-cut from three directions by sequentially attaching the head portion of the gas cutting torch via the pivot shaft to the three torch mounting portions of the torch support frame body and rotating the same. The rail cutting device comprised in this.   The rail cutting device according to claim 1, wherein a bearing is fitted on the inner periphery of the torch holding hole of each torch mounting portion.   A cap for closing the torch holding hole of the torch attachment portion is provided, and the cap is fitted to a torch attachment portion to which a head portion of the gas cutting torch is not attached at the time of gas cutting of the rail. The rail cutting device described in 1.   The rail according to any one of claims 1 to 3, wherein the torch mounting portion and the cap are made of a magnetic metal, and the cap is configured to be magnetically attracted to a front end portion of the torch mounting portion by a magnet attached to the cap side. Cutting device.   The clamp arm is pivotally attached to the rail abutting frame portion via a pivot pin so as to be pivotable in the vertical direction, and is opposite to the tip side of the clamp arm pressed against the rail with the pivot pin interposed therebetween. A screw cylinder portion is provided at the end of the side, and the pressing means comprises an operation screw shaft that is screwed to the screw cylinder portion and the tip abuts against the rail abutting frame portion, and the rotation of the operation screw shaft The rail cutting device according to any one of claims 1 to 4, wherein the clamp arm is configured to rotate.

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