Rail gas pressure welding machine

Abstract

To provide a rail gas pressure welding machine with good workability, in which a following movement mechanism does not bulge out in a lateral direction, even in a small-sized pressure welding machine.SOLUTION: A rail gas pressure welding machine is equipped with a fixed frame 11 and a moving frame 12 that are respectively fixed to a pair of rails 10 to be pressure welded, a heating burner 13, and a compression moving amount following mechanism 15 that is provided outside the fixed frame 11 in a longitudinal direction of the rail 10, and moves the heating burner 13 by following the compression moving amount of the rail 10. The compression moving amount following mechanism 15 is equipped with a rotary arm 18 capable of horizontally rotating around a shaft provided at a fixed place, and the rotary arm 18 is coupled to the heating burner 13 at a center position between a coupled position coupled to the moving frame 12 and the shaft position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rail gas pressure welding machine for gas pressure welding railway rails, and in particular to a rail gas pressure welding machine suitable for a rail base clamp type rail gas pressure welding machine. [Background technology]

[0002] Gas pressure welding is the primary method used to weld rails for railways. Gas pressure welding involves welding the butted rail ends together under pressure while heating them with an oxygen-acetylene flame. In this gas pressure welding method, the rail surface melts during the heating process, and the burner backfires due to dripping molten metal occur. To prevent this, the burner is oscillated.

[0003] In addition, since the pressure-welded interface moves as the rail is compressed, good joint quality can be ensured by adjusting the burner to follow the amount of compression movement and always heating the pressure-welded interface.

[0004] In conventional gas pressure welding, there is no set procedure, and the worker manually controls the burner swing and adjusts the burner movement and compression amount based on their own judgment, which is based on experience and intuition. As a result, depending on the swing and adjustment methods, there is a risk of variations in joint quality, and in some cases, this could lead to welding defects.

[0005] The heating burner rocking device described in Patent Document 1 is provided with a rocking function that automatically rocks the heating burner, and a follow-up movement function that moves the heating burner by half the amount of compressive deformation of the rail, thereby ensuring sufficient heat input to the pressure-welded interface and a predetermined amount of compression. Specifically, the rocking and follow-up movement functions of the heating burner in this heating burner rocking device include a support frame, a fixed part that is fixed to the support frame and does not move, a movable frame, a movable arm connected to the movable frame, a pressing spring that is hung between the fixed part and the tip of the movable arm, a rocking mechanism for the heating burner, a rocking part that is moved by the rocking mechanism, and a movement amount halving device having a first link and a second link that moves the rocking mechanism by half the movement distance of the movable frame, thereby rocking and following the movement of the heating burner. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6343826 Summary of the Invention [Problem to be solved by the invention]

[0007] The heating burner rocking device described in Patent Document 1 can automatically ensure heat input to the pressure-welded interface and a predetermined compression amount, but the problem is that the dimensions are inevitably large because the movement amount halving device is structured to consist of a common pivot shaft pivoted to the top of the first link and the second link, a pivot shaft pivoted to the fixed part, and a pivot shaft pivoted to the moving part.

[0008] The rail gas pressure welding machine described in Patent Document 1 is a rail body clamp type and has relatively large overall dimensions, so there was no problem with providing such a large tracking movement mechanism. However, if such a large tracking movement mechanism is provided in a small rail base clamp type rail gas pressure welding machine, the entire tracking movement mechanism will protrude significantly laterally from the main body of the rail gas welding machine, significantly worsening the workability of the pressure welding work.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rail gas pressure welding machine that is easy to work with, even if it is a small pressure welding machine, and in which the follow-up movement mechanism does not protrude laterally. [Means for solving the problem]

[0010] According to the present invention, the rail gas pressure welding machine comprises a fixed frame and a movable frame respectively attached and fixed to a pair of rails to be pressure welded, a heating burner, and a compression movement amount tracking mechanism provided outside the fixed frame in the longitudinal direction of the rails and moving the heating burner in accordance with the compression movement of the rail. The compression movement amount tracking mechanism has a rotating arm that can rotate horizontally around an axis provided at a fixed position, and this rotating arm is connected to the heating burner at a position midway between the connecting position where it is connected to the movable frame and the position of the axis.

[0011] The compression travel tracking mechanism includes a pivot arm that can pivot horizontally around an axis, and the pivot arm is connected to the heating burner at a position midway between the position where the pivot arm is connected to the movable frame and the position of the axis. Therefore, when the connecting position of the pivot arm rotates and moves a distance corresponding to the compression travel of the movable frame, the central position of the pivot arm connected to the heating burner moves half the distance of the moving position, and therefore the heating burner also moves half that distance. In particular, in the present invention, the pivot arm is configured to pivot horizontally, and the compression travel tracking mechanism is provided outside the fixed frame in the longitudinal direction of the rail. Therefore, this tracking mechanism does not protrude laterally from the rail gas pressure welding machine and does not interfere with the pressure welding operation. As a result, the rail gas pressure welding machine of the present invention achieves extremely good pressure welding workability.

[0012] It is preferable that the above-mentioned shaft is provided at one end of the rotating arm, and that a connecting portion is provided at the other end of the rotating arm.

[0013] It is also preferable that the connecting portion includes a first protrusion connected to the moving frame and interlocked with the movement of the moving frame, and a first elongated hole provided on the rotating arm and into which the first protrusion is inserted.

[0014] It is also preferable that the heating burner further includes an operating rod connected to the heating burner for manually swinging the heating burner.

[0015] It is also preferable that the compression movement amount tracking mechanism includes a swing width regulating mechanism that regulates the swing width of the heating burner, and a swing prohibiting mechanism that prohibits the swing of the heating burner.

[0016] It is also preferable that the swing width regulating mechanism and the swing prohibiting mechanism are configured to be switchable so that only one of them operates.

[0017] It is also preferable that the oscillation width determining mechanism is provided with a second protrusion that moves in conjunction with the movement of the heating burner, and a second long hole that is provided on the pivot arm and into which the second protrusion is inserted, and that the oscillation width is determined by the lateral movement width of the second protrusion within this second long hole.

[0018] It is also preferable that the anti-swing mechanism has a second protrusion that moves in conjunction with the movement of the heating burner and a slit on the pivot arm into which the second protrusion is inserted, and that this slit is configured to prevent the second protrusion from moving.

[0019] It is also preferable that the compression movement amount tracking mechanism is provided with a spring member that presses the moving frame in the direction opposite to the compression advance direction, and that this spring member is configured to suppress play in the movement of the moving frame in the compression advance direction.

[0020] It is also preferable to further provide a stopper mechanism that can connect the moving frame and the compression movement amount tracking mechanism only when necessary and can disconnect the connection when not necessary.

[0021] It is also preferable that the rotary arm of the compression movement amount tracking mechanism is configured to be detachable from the rail gas pressure welding machine. [Effects of the Invention]

[0022] In the present invention, the rotary arm is configured to rotate horizontally, and the compression movement tracking mechanism is provided outside the fixed frame in the longitudinal direction of the rail, so this tracking movement mechanism does not protrude to the side or in the direction of the rail gas pressure welding machine and does not interfere with the pressure welding work. As a result, the rail gas pressure welding machine of the present invention makes the pressure welding work very easy. [Brief explanation of the drawings]

[0023] [Figure 1] 1A and 1B are a side view seen from the rail longitudinal direction and a side view seen from the rail lateral direction, respectively, which schematically show the configuration of one embodiment of a rail gas pressure welding machine of the present invention. [Figure 2] 2 is a plan view schematically showing the configuration of the rail gas pressure welding machine shown in FIG. 1 as seen from above. FIG. [Figure 3] 2 is an explanatory diagram illustrating the operation of a compression movement amount tracking mechanism for the rail gas pressure welding machine shown in FIG. 1. FIG. [Figure 4] 2 is a perspective view showing a schematic configuration of the rail gas pressure welding machine shown in FIG. 1 with a fixed frame portion removed. FIG. [Figure 5] 2 is a side view of the rail gas pressure welding machine shown in FIG. 1, seen from the rail lateral direction. FIG. [Figure 6] FIG. 2 is a perspective view showing a schematic configuration of the rail gas pressure welding machine shown in FIG. [Figure 7] 7 is a plan view showing a schematic configuration of the rail gas pressure welding machine of FIG. 6 as seen from above. FIG. [Figure 8] 2 is a plan view illustrating the operation of a swing width regulating mechanism of the rail gas pressure welding machine shown in FIG. 1. FIG. [Figure 9] 2A and 2B are a side view and a plan view illustrating the switching function of a swing width regulating mechanism and a swing prohibiting mechanism in the rail gas pressure welding machine shown in FIG. 1. [Figure 10] 1. FIG. 4 is a perspective view showing a schematic configuration of the rail gas pressure welding machine shown in FIG. 1 when switched to a swing prevention mechanism. [Figure 11] 11 is a plan view showing a schematic configuration of the rail gas pressure welding machine in the state shown in FIG. 10 as seen from above. FIG. [Figure 12] 2 is a partially enlarged perspective view showing a spring member portion of the rail gas pressure welding machine shown in FIG. 1. FIG. [Figure 13] 2 is a partially cutaway side view showing in detail the configuration of a stopper mechanism of the rail gas pressure welding machine shown in FIG. 1. [Figure 14] 14A and 14B are side views seen from the rail lateral direction, illustrating the operation of the stopper mechanism shown in FIG. 13, showing (A) a disconnected state and (B) a connected state. DETAILED DESCRIPTION OF THE INVENTION

[0024] Figure 1 shows a schematic configuration of one embodiment of the rail gas pressure welding machine of the present invention, with Figure 1(A) showing the configuration as seen from the longitudinal direction of the rail and Figure 1(B) showing the configuration as seen from the lateral direction of the rail. However, Figure 1(A) does not show the clamping portion of the rail, and Figure 1(B) does not show the rail. Figure 2 also shows a schematic configuration of the rail gas pressure welding machine of this embodiment as seen from above. In Figure 2, the rail is also not shown. The rail gas pressure welding machine of this embodiment is a small and lightweight rail base clamp type rail gas pressure welding machine that is clamped to the base of the rail and fixed in place.

[0025] 1 and 2, 10 denotes a pair of rails to be pressed together, 11 denotes a fixed frame to which one of the rails 10 to be pressed together is fixedly attached, 12 denotes a movable frame to which the other rail 10 to be pressed together is fixedly attached, 13 denotes a heating burner supported by a burner case 14 disposed between the fixed frame 11 and the movable frame 12, and 15 denotes a compression movement amount tracking mechanism provided outside the fixed frame 11 in the longitudinal direction of the rail 10. The fixed frame 11 is attached and fixed in position to a support member 16 provided along the rail 10, and the movable frame 12 and burner case 14 are attached to the support member 16 so as to be slidable in the longitudinal direction.

[0026] The compression movement amount tracking mechanism 15 is disposed outside the fixed frame 11 in the rail longitudinal direction, i.e., outside the end of the support member 16 on the fixed frame 11 side. This compression movement amount tracking mechanism 15 is supported by a shaft 17 provided in a fixed position and is equipped with a rotating arm 18 that is rotatable horizontally around this shaft 17. This rotating arm 18 is detachable from the rail gas pressure welding machine, and is configured so that by removing it the weight of the rail gas pressure welding machine main body can be reduced and the rail gas pressure welding machine can be transported in that state.

[0027] One end 18a of the pivot arm 18 is pivotally supported by the shaft 17, and the other end 18b has a first elongated hole 19 extending along the longitudinal direction of the pivot arm 18. A first protrusion 20 is inserted into the first elongated hole 19. The first protrusion 20 is connected to the moving frame 12 via a first link member 21 (when a stopper mechanism 29, described later, is in a connected state) and is configured to move along the rail longitudinal direction in conjunction with movement of the moving frame 12 along the rail longitudinal direction. The first elongated hole 19 and the first protrusion 20 form a first connecting portion 22. A second elongated hole 23 extending along the longitudinal direction of the pivot arm 18 is provided at a central position between the shaft 17 of the pivot arm 18 and the first connecting portion 22. A second protrusion 24 is inserted into the second elongated hole 23. The second protrusion 24 is connected to the burner case 14 via a second link member 25. Therefore, the heating burner 13 attached to this burner case 14 is configured to be movable in the longitudinal direction of the rail in conjunction with the movement of the moving frame 12 in the longitudinal direction of the rail (when the stopper mechanism 29 is in the connected state). The second elongated hole 23 and the second protrusion 24 form a second connecting part 26. As shown in Figure 2, the length from the shaft 17 of the rotating arm 18 to the second connecting part 26 is L1, which is equal to the length L1 from the second connecting part 26 to the first connecting part 22.

[0028] Therefore, when the stopper mechanism 29 is in the connected state, the moving frame 12 moves due to the compressive movement of the rail caused by pressure contact, and the rotating arm 18 pivots horizontally about the shaft 17, so that the second connecting part 26 moves half the distance traveled by the first connecting part 22. That is, as shown in Figure 3, when the first connecting part 22 of the rotating arm 18 moves a distance corresponding to the compressive movement amount of the moving frame 12, the second connecting part 26 moves half the distance traveled by the first connecting part 22, and the heating burner 13 also moves half that distance. As a result, when the moving frame 12 moves compressively, the heating burner 13 moves in the longitudinal direction of the rail a distance half the amount of the compressive movement.

[0029] 4 is a schematic diagram showing the configuration of the rail gas pressure welding machine of this embodiment, with the fixed frame 11 removed. The second link member 25 will be described below with reference to this drawing.

[0030] As shown in the figure, the second link member 25 has a pair of link rods 25a, one end of which is connected to the burner case 14 and the other end of which is connected to the second protrusion 24. Two parallel lateral rods 25b are spanned between the pair of link rods 25a. An L-shaped tip protrusion 27a of an operating rod 27 is inserted into the gap between the two lateral rods 25b. The middle portion of the operating rod 27 is supported by a shaft 17. When an operator rotates the operating rod 27 horizontally, it rotates around the shaft 17 as a fulcrum, and the tip protrusion 27a moves in the longitudinal direction of the rail. As a result, the two lateral rods 25b into which the tip protrusions 27a are inserted and the pair of link rods 25a (second link member 25) move in the longitudinal direction of the rail, moving the burner case 14 in the longitudinal direction of the rail. As a result, the heating burner 13 swings. That is, in this embodiment, the heating burner 13 can be manually swung by operating the operating rod 27. In addition, in Figure 4, 28 denotes a pressure cylinder that pressurizes the moving frame 12 toward the fixed frame 11.

[0031] 5 is a schematic diagram of the rail gas pressure welding machine of this embodiment as viewed from the rail lateral direction. The first link member 21 will be described below with reference to this figure.

[0032] As shown in the figure, the first link member 21 has two link rods 21a and 21b, one end of which is connected to the moving frame 12 via a member 21c and a stopper mechanism 29, and the other end of which is connected to a first protrusion 20 (see FIG. 2). When the moving frame 12 moves in the rail longitudinal direction due to compression movement, the link rods 21a and 21b (first link member 21) move in the rail longitudinal direction via the stopper mechanism 29 and member 21c, and the rotating arm 18 rotates around the shaft 17 as a fulcrum via the first protrusion 20 and the first elongated hole 19 of the rotating arm 18 (i.e., via the first connecting portion 22). As a result, the heating burner 13 moves in the following direction as described above.

[0033] Figure 6 shows a schematic configuration of the rail gas pressure welding machine of this embodiment, Figure 7 shows a schematic configuration of the rail gas pressure welding machine of Figure 6 seen from above, and Figure 8 explains the operation of the oscillation width regulating mechanism for the rail gas pressure welding machine of Figure 6. Below, using these figures, the oscillation width regulating mechanism that regulates the oscillation width of the heating burner 13 will be explained.

[0034] As shown in these figures, the rotating arm 18 is provided with a second elongated hole 23 along its longitudinal direction, and a second protrusion 24 is inserted into the second elongated hole 23. The second protrusion 24 is provided at one end of a second link member 25, the other end of which is connected to the burner case 14 of the heating burner 13. Therefore, the heating burner 13 moves in conjunction with the movement of the second protrusion 24. The second elongated hole 23 has a predetermined width that allows the second protrusion 24 to move laterally, and as shown in FIG. 8, the width L2 of lateral movement (at the center) of the second protrusion 24 determines the swing width of the heating burner 13. That is, the heating burner 13 is oscillated by the operator by manually rotating the operating rod 27. At that time, the second link member 25 moves in the longitudinal direction of the rail via the lateral rod 25b linked to the tip protrusion 27a of the operating rod 27, and the second protrusion 24 at its tip attempts to move in the longitudinal direction of the rail, but the range of this movement is limited by the movable range L2 of the second long hole 23, so the oscillation range of the heating burner 13 is determined.

[0035] Figure 9 explains the switching function of the oscillation width regulating mechanism and the oscillation prohibition mechanism for the rail gas pressure welding machine of this embodiment, with Figure 9(A) showing the configuration as seen from the side and Figure 9(B) showing the configuration as seen from above. Figure 10 schematically shows the configuration of the rail gas pressure welding machine of this embodiment when switched to the oscillation prohibition mechanism, and Figure 11 schematically shows the configuration of the rail gas pressure welding machine of Figure 10 as seen from above. Below, these figures will be used to explain the switching function of the oscillation width regulating mechanism and the oscillation prohibition mechanism, and the configuration of the oscillation prohibition mechanism.

[0036] As described above, the rotating arm 18 is formed with the second elongated hole 23 (see FIG. 8 ), and the second protrusion 24, which moves in conjunction with the movement of the heating burner 13, is inserted into the second elongated hole 23, thereby forming an oscillation width regulating mechanism. As shown in FIGS. 9 to 11 , the rotating arm 18 is further provided with a slit plate 31 having a slit 30 formed along the longitudinal direction of the rotating arm 18, and a hinge 32 is attached to one end of the slit plate 31, as shown in FIG. 9(A). The slit plate 31 rotates about the hinge 32 as an axis and is superimposed on the rotating arm 18, so that the slit 30 can be positioned to cover the second elongated hole 23. The width of the slit 30 is set so that the second protrusion 24 cannot move laterally (in the longitudinal direction of the rail), and by inserting the second protrusion 24 into the slit 30, the second protrusion 24 cannot move laterally (in the longitudinal direction of the rail) of the slit 30, preventing the heating burner 13 from swinging. In other words, the swing prohibition mechanism is made up of the slit plate 31 having the slit 30 and the second protrusion 24. Switching between the swing width regulating mechanism and the swing prohibition mechanism can be done with a single touch by simply rotating the slit plate 31 around the hinge 32 as the pivot axis.

[0037] In normal operation of a rail gas pressure welding machine, the heating burner 13 is first moved in accordance with the amount of compression movement of the rail. In this case, the swing-preventing mechanism is activated. Specifically, the slit plate 31 is rotated as shown in FIG. 9(B) to overlap the second elongated hole 23, and the second protrusion 24 is inserted into the slit 30. This prevents the heating burner 13 from swinging. The pivot arm 18 is then rotated, and the heating burner 13 is moved in accordance with the amount of compression movement. The swing-preventing mechanism is then stopped, and the swing-width regulating mechanism is activated to manually swing the heating burner 13. Specifically, the slit plate 31 is rotated as shown in FIG. 9(A) to insert the second protrusion 24 into the second elongated hole 23, and the heating burner 13 is manually swung while the swing width is regulated by the width of the second elongated hole 23.

[0038] 12 shows an enlarged view of the spring member portion of the rail gas pressure welding machine of this embodiment. The configuration of the spring member will be described below with reference to this drawing.

[0039] As shown in FIG. 12 , a coil-shaped spring member 33 is provided coaxially with the link rod 21a in the middle of the first link member 21. One end of this spring member 33 is fixed to the support member 16 via the member 16a, and the other end is configured to press the moving frame 12 via the stopper mechanism 29. More specifically, the other end of the spring member 33 is provided at one end of the first link member 21 and configured to press the member 21c linked to the first link member 21. Therefore, when the stopper mechanism 29 is in a connected state, the spring member 33 presses the moving frame 12 in the direction opposite (direction B) to the direction of compression (direction A). Providing this spring member 33 reduces play in the movement of the moving frame 12 in the direction of compression. As a result, the heating burner 14 can reliably follow the movement of the moving frame 12, with a movement amount that is half the amount of compression movement of the rail.

[0040] Figure 13 shows in more detail the configuration of stopper mechanism 29 in the gas pressure welding machine of this embodiment, and Figure 14 shows the state as seen from the side of the rail to explain the operation of stopper mechanism 29 shown in Figure 13, with Figure 14(A) showing the disconnected state and Figure 14(B) showing the connected state. The configuration and operation of stopper mechanism 29 will be explained below with reference to Figures 12 to 14.

[0041] As shown in Figure 12, a groove 34 is formed in the moving frame 12 along the rail lateral direction, and a stopper bar member 35 is fitted into this groove 34. As shown in Figure 13, this bar member 35 is biased upward by a spring 36, and is normally positioned in the upper position.

[0042] A pivot shaft 38 that pivotally supports a lever member 37 is attached to member 21c of first link member 21, and the upper surface of lever member 37, which has an L-shaped cross section, is configured to fit onto bar member 35 to lock the moving frame 12. That is, when the rail is not pressed into contact, as shown in FIG. 14(A), the bar member 35 is pushed upward by spring 36. As a result, the bar member 35 does not fit onto the lever member 37, the locking mechanism 29 is not locked, and the moving frame 12 is in a non-connected state (disconnected state) with the compression travel tracking mechanism 15. On the other hand, when the rail is pressed into contact, as shown in FIG. 14(B), the bar member 35 is pushed downward against the repulsive force of spring 36. As a result, the bar member 35 fits onto the lever member 37, the locking mechanism 29 is locked, and the moving frame 12 is connected to the compression travel tracking mechanism 15.

[0043] In this way, the locking mechanism 29 connects the moving frame 12 and the compression movement amount tracking mechanism 15 only when pressure is applied, and disconnects them when pressure is not applied. Because the moving frame 12 is free to move in the longitudinal direction of the rail, if it were always connected to the compression movement amount tracking mechanism 15, excessive movement could cause excessive stress on the compression movement amount tracking mechanism 15, which could cause problems. However, by using the locking mechanism 29 to connect the moving frame 12 and the compression movement amount tracking mechanism 15 only when pressure is applied, as in this embodiment, such problems can be prevented from occurring.

[0044] As explained above, according to this embodiment, the rotating arm 18 is configured to rotate horizontally, and the compression movement amount tracking mechanism 15 is provided outside the fixed frame 11 in the longitudinal direction of the rail, so this tracking movement mechanism 15 does not protrude laterally from the rail gas pressure welding machine and does not interfere with the pressure welding work. As a result, the rail gas pressure welding machine of the present invention provides very good workability in pressure welding.

[0045] The above-described embodiments are merely illustrative of the present invention and are not limiting, and the present invention can be embodied in various other modified and altered forms. Therefore, the scope of the present invention is defined only by the claims and their equivalents. [Explanation of symbols]

[0046] 10 Rail 11 Fixed Frame 12 Moving Frames 13 Heating burner 14 Burner Case 15 Compression movement tracking mechanism 16 Support member 16a, 21c parts 17 axes 18 Rotating arm 18a One end 18b Other end 19 First slot 20 First protrusion 21 first link member 21a, 21b, 25a link rod 22 First connecting part 23 Second slot 24 Second protrusion 25 Second link member 25b Transverse rod 26 Second connection 27 Operating rod 27a Tip protrusion 28 Pressurizing cylinder 29 Stopper mechanism 30 slits 31 Slit plate 32 hinges 33 Spring member 34 Groove 35 Bar member 36 Spring 37 Lever member

Claims

1. A rail gas pressure welding machine comprising: a fixed frame and a movable frame respectively attached and fixed to a pair of rails to be pressure welded; a heating burner; and a compression movement amount tracking mechanism provided outside the fixed frame in the longitudinal direction of the rails and moving the heating burner in accordance with the compression movement amount of the rails, wherein the compression movement amount tracking mechanism has a rotating arm that can rotate horizontally around an axis provided at a fixed position, and the rotating arm is connected to the heating burner at a position midway between the connection position connected to the movable frame and the position of the axis.

2. 2. The rail gas pressure welding machine according to claim 1, wherein the shaft is provided at one end of the rotary arm, and a connecting portion is provided at the other end of the rotary arm.

3. 3. A rail gas pressure welding machine according to claim 2, wherein the connecting portion comprises a first protrusion connected to the moving frame and adapted to move in conjunction with the movement of the moving frame, and a first elongated hole provided on the rotating arm into which the first protrusion is inserted.

4. 4. The rail gas pressure welding machine according to claim 1, further comprising an operating rod connected to the heating burner for manually swinging the heating burner.

5. A rail gas pressure welding machine as described in any one of claims 1 to 4, characterized in that the compression movement amount tracking mechanism includes an oscillation width regulating mechanism that regulates the oscillation width of the heating burner, and an oscillation prohibiting mechanism that prohibits the oscillation of the heating burner.

6. 6. The rail gas pressure welding machine according to claim 5, wherein the swing width regulating mechanism and the swing prohibiting mechanism are configured to be switchable so that only one of them operates.

7. The rail gas pressure welding machine according to claim 5 or 6, characterized in that the oscillation width regulating mechanism comprises a second protrusion that moves in conjunction with the movement of the heating burner, and a second elongated hole that is provided on the pivot arm and into which the second protrusion is inserted, and is configured to regulate the oscillation width by the lateral movement width of the second protrusion within the second elongated hole.

8. A rail gas pressure welding machine as described in any one of claims 5 to 7, characterized in that the oscillation prevention mechanism includes a second protrusion that moves in conjunction with the movement of the heating burner, and a slit that is provided on the rotating arm and into which the second protrusion is inserted, and the slit is configured to prevent the second protrusion from moving.

9. A rail gas pressure welding machine according to any one of claims 1 to 8, characterized in that the compression movement amount tracking mechanism is provided with a spring member that presses the moving frame in a direction opposite to the compression advance direction, and the spring member is configured to suppress play in the movement of the moving frame in the compression advance direction.

10. A rail gas pressure welding machine as described in any one of claims 1 to 9, further comprising a stopper mechanism that can connect the moving frame and the compression movement amount tracking mechanism only when necessary and can disconnect the connection when not necessary.

11. 11. The rail gas pressure welding machine according to claim 1, wherein the rotary arm of the compression movement amount tracking mechanism is configured to be detachable from the rail gas pressure welding machine.

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