A band saw rail cutting machine

Abstract

The present invention relates to a band saw rail cutting machine, including a rail cutting structure and a driving device. The rail cutting structure includes a band saw blade, and is characterized in that it also includes at least two transmission wheels, and the band saw blade is tensioned on each of the transmission wheels in sequence; it also includes a transmission mechanism, and the transmission mechanism can transmit the driving force of the driving device to each transmission wheel so that each transmission wheel rotates synchronously and drives the band saw blade. Compared with the prior art, the rail cutting machine of the present invention includes at least two transmission wheels. Compared with the existing single transmission wheel rail cutting machine, the present invention can use a transmission wheel with a smaller wheel diameter without increasing the transmission wheel wrap angle, thereby reducing the overall weight of the rail cutting machine and making the rail cutting stable. At the same time, it can also reduce the tension of the band saw blade, thereby extending the service life of the band saw blade. In short, the rail cutting machine of the present invention has a reasonable structural design and is easy to use. It is particularly suitable for high-power and fast rail cutting operations.

Description

Technical Field

[0001] The invention relates to the field of railway laying and maintenance, and in particular to a band saw rail cutting machine. Background Art

[0002] During the laying and daily maintenance of rails, rail cutting operations are required. Existing rail cutting operations mostly use grinding wheel cutters to cut rails, such as: Chinese utility model patent No. ZL201720298935.1 (authorization announcement No. CN206614387 U) discloses a semi-automatic hydraulic rail cutting device, which is provided with a hydraulic cutting assembly, which includes a motor mounting seat, a grinding wheel saw, a hydraulic motor and a grinding wheel saw protective cover. When the grinding wheel cutter is cutting rails, the high-speed rotating grinding wheel cutting blade rubs against the rails, thereby cutting the rails. During the grinding wheel cutting operation, the sparks formed by the fallen high-temperature grinding wheel abrasives and iron filings fly everywhere, seriously affecting the personal safety of the surrounding workers, and easily causing safety hazards such as fire. At the same time, the abrasives on the cutting blade continue to fall off during the rail cutting process, and its radius and thickness continue to decrease, resulting in poor flatness of the cutting surface, short service life of the cutting blade, and poor economy. In addition, the high temperature generated during cutting can easily change the metallographic structure and chemical composition of the incision.

[0003] Furthermore, band saw blade rail cutting machines are also used in rail cutting operations, such as: Chinese invention patent with application number 201610313844.0 (application publication number CN 105798381 A) discloses an electric rail sawing machine, which includes a rail clamping mechanism and a cutting mechanism, the cutting mechanism is installed on the rail clamping mechanism, the rail clamping mechanism includes a frame, a rail clamp and a lifter, the rail clamp is fixed at the bottom of the frame, the lifter is connected to the top of the frame, and the cutting mechanism is connected and installed with the lifter; the cutting mechanism includes a box body, a motor, a driving wheel, a tensioning wheel, a driven wheel group and a cutting saw blade, the driving wheel and the tensioning wheel are respectively arranged on the left and right sides of the inside of the box body, the motor is installed on the back of the box body and connected to the driving wheel, the driven wheel group is arranged inside the box body between the driving wheel and the tensioning wheel, the cutting saw blade passes through the driving wheel, the driven wheel group and the tensioning wheel in sequence to form a ring connected end to end, and the cutting saw blade is S-shaped and passed between the driven wheel groups. Although the band saw blade rail cutting machine can solve the problems existing in the above-mentioned grinding wheel cutting machine, the existing band saw blade rail cutting machine still has the following problems: (1) In general, the cutting depth is determined by the wheel diameter of the transmission wheel. The greater the cutting depth, the larger the transmission wheel diameter. However, the larger the transmission wheel diameter, the heavier the weight of the rail cutting machine. (2) In order to improve the friction between the transmission wheel and the saw blade, the existing band saw blade rail cutting machine generally increases the tension of the band saw blade and increases the auxiliary wheel to increase the wrap angle of the transmission wheel. This will cause the band saw blade to have high tension and bidirectional bending, thereby affecting the service life of the band saw blade. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a band saw rail cutting machine with stable rail cutting in view of the prior art.

[0005] The second technical problem to be solved by the present invention is to provide a band saw rail cutting machine with light weight according to the prior art.

[0006] The third technical problem to be solved by the present invention is to provide a band saw rail cutting machine with a long band saw blade service life in view of the prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a band saw rail cutting machine, including a rail cutting structure and a driving device, the rail cutting structure includes a band saw blade, and is characterized in that it also includes at least two transmission wheels, and the above-mentioned band saw blade is tensioned on each of the above-mentioned transmission wheels in sequence; it also includes a transmission mechanism, which can transmit the driving force of the above-mentioned driving device to each transmission wheel so that each transmission wheel rotates synchronously and drives the above-mentioned band saw blade.

[0008] Preferably, the transmission mechanism comprises a synchronous belt, a driving wheel and at least one driven wheel, wherein the synchronous belt is sequentially tensioned on the driving wheel and each driven wheel, and the total number of the driving wheels and the driven wheels matches the number of the transmission wheels, wherein the driving wheel is linked to the power output shaft of the driving device, the driving wheel is linked to one of the transmission wheels through the driving shaft, and each driven wheel is linked to the corresponding remaining transmission wheels through the driven shaft. The transmission mechanism can make each transmission wheel rotate more smoothly, thereby driving the band saw blade more smoothly.

[0009] Preferably, there are two transmission wheels, namely a left transmission wheel and a right transmission wheel, and the rail cutting structure further comprises a first tensioning wheel, wherein the first tensioning wheel, the left transmission wheel and the right transmission wheel are arranged in a triangle, and the band saw blade is tensioned on the first tensioning wheel, the left transmission wheel and the right transmission wheel in sequence to form a closed triangle shape. In this way, the band saw blade is arranged in a triangle, so that the band saw blade is always bent on one side and is not affected by the reverse alternating force, thereby further extending the service life of the band saw blade.

[0010] Further, preferably, the first tensioning wheel is mounted on a tensioning wheel shaft, and the tensioning wheel shaft is movable to drive the first tensioning wheel to tension or loosen the band saw blade.

[0011] Preferably, the transmission mechanism also includes a second tensioning wheel and a tensioning wheel sliding assembly, and the synchronous belt is tensioned on the above-mentioned driving wheel, each driven wheel and the second tensioning wheel in sequence to form a closed loop, and the second tensioning wheel can move under the drive of the above-mentioned tensioning wheel sliding assembly to tension or loosen the synchronous belt.

[0012] Preferably, the transmission mechanism further includes a guide wheel, and the synchronous belt is sequentially tensioned on the above-mentioned driving wheel, each driven wheel and the guide wheel to form a closed loop, or the synchronous belt is sequentially tensioned on the above-mentioned driving wheel, each driven wheel, the second tensioning wheel and the guide wheel to form a closed loop.

[0013] Preferably, the machine further comprises a housing, wherein the rail cutting structure and the transmission mechanism are both arranged in the housing, and a rail cutting notch is formed at one end of the housing, wherein a section of the band saw blade is exposed in the rail cutting notch, so that the rail can be smoothly cut by the band saw blade section in the rail cutting notch.

[0014] Preferably, the left and right transmission wheels are respectively located on the left and right sides of the rail cutting notch, and the first tensioning wheel is located above the rail cutting notch. In this way, the slotting height of the rail cutting notch is not affected by the transmission wheels on both sides, and the height of the rail cutting notch can be changed as needed without changing the size of the transmission wheels, thereby making the rail cutting machine suitable for rail cutting operations of different specifications.

[0015] Preferably, the two ends of the rail cutting notch along the direction in which the band saw blade passes are respectively provided with limiting guide structures for limiting and guiding the band saw blade to move in the rail cutting notch, so that the band saw blade can move more smoothly in the rail cutting notch and thus cut the rails smoothly.

[0016] Preferably, the apparatus further comprises a mounting bracket, on which a rail clamping mechanism and a feeding mechanism are arranged, wherein the feeding mechanism comprises a feeding slider that can move relative to the mounting bracket, and the rail cutting structure is linked to the feeding slider in a detachable connection so that the rail cutting structure can move relative to the mounting bracket.

[0017] Compared with the prior art, the advantages of the present invention are: the rail cutter of the present invention includes at least two transmission wheels. Compared with the existing single transmission wheel rail cutter, the present invention can use a transmission wheel with a smaller wheel diameter without increasing the transmission wheel wrap angle under the premise of ensuring the friction required for transmission, thereby reducing the overall weight of the rail cutter and being able to cut rails stably. At the same time, it can also reduce the tension of the band saw blade, thereby extending the service life of the band saw blade. In short, the rail cutter of the present invention has a reasonable structural design and is easy to use, and is particularly suitable for high-power and fast rail cutting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the rail cutting machine in the embodiment of the present invention (in working state);

[0019] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0020] Figure 3 for Figure 1A schematic diagram of the structure in another direction;

[0021] Figure 4 It is a schematic diagram of the structure of the rail cutting machine in a non-working state according to an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of part I;

[0023] Figure 6 A schematic diagram of a partial structure of a rail cutting structure in an embodiment of the present invention;

[0024] Figure 7 for Figure 6 A schematic diagram of the structure in another direction;

[0025] Figure 8 for Figure 7 Enlarged view of part II;

[0026] Fig. 9 It is a structural schematic diagram of the rail cutting structure in an embodiment of the present invention;

[0027] Fig.10 Another partial structural schematic diagram of the rail cutting structure in an embodiment of the present invention;

[0028] Fig.11 This is a schematic diagram of the structure of the housing in an embodiment of the present invention;

[0029] Fig.12 for Fig.11 A schematic diagram of the structure in another direction;

[0030] Fig.13 It is a structural schematic diagram of a mounting bracket in an embodiment of the present invention;

[0031] Fig.14 for Fig.13 Schematic diagram of the structure in another direction. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 14As shown, a band saw rail cutting machine includes a mounting bracket 5, a rail clamping mechanism 7, a feeding mechanism 6, a rail cutting structure and a driving device 3. In this embodiment, the driving device 3 is a motor. The mounting bracket 5 includes a mounting top plate 51, a mounting bottom plate 52, and left and right side plates 53, 54 respectively connected to the mounting top plate 51 and the mounting bottom plate 52. The feeding mechanism 6 includes a feeding screw 62, a feeding slider 61, a feeding hand wheel 64, a feeding pin 63, a feeding handle 65 and a guide column 55. The guide column 55 is two and is vertically arranged at the left and right ends of the inside of the mounting bracket 5, respectively. The upper end of each guide column 55 is fixed to the mounting top plate 51, and the lower end is fixed to the mounting bottom plate 52. The feed slider 61 is connected to each guide column 55, and a feed screw hole (not shown) is provided on the feed slider 61. The feed screw rod 62 is vertically inserted into the feed screw hole, and the upper end of the feed screw rod 62 passes through the mounting top plate 51 and is fixed with the feed hand wheel 64. There are two feed pins 63, which are horizontally inserted into the feed slider 61, and the feed handle 65 is fixed to one end of each feed pin 63. The rail cutting structure is detachably connected to each feed pin 63 through the connecting frame 8, so that rotating the feed handle 65 can make the feed pin 63 move horizontally in the feed slider 61, thereby making the rail cutting structure approach or separate from the mounting bracket 5. Specifically, the connecting frame 8 includes a first connecting plate 81, on which mounting notches 811 are respectively provided for inserting the feed pins 63. The first connecting plate 81 is limitedly inserted into the feed pins 63 to realize the detachable connection between the connecting frame 8 and the feed pins 63. When the track cutting structure needs to be installed on the mounting bracket 5, it is only necessary to insert the mounting notches 811 on the first connecting plate 81 into the corresponding feed pins 63, and then move the feed pins 63 through the feed handle 65 to make the track cutting structure close to the mounting bracket 5. When the track cutting operation is completed and the track cutting structure needs to be disassembled, the feed pins 63 are moved through the feed handle 65 to make the track cutting structure away from the mounting bracket 5, and then the track cutting structure is removed from the feed pins 63. In order to enable the first connecting plate 81 to be more firmly inserted into the feed pins 63, a positioning cam 631 is fixed to the free end of each feed pin 63.

[0034] The rail clamping mechanism 7 comprises a clamping jaw 71 and a clamping screw 72 (the screw thread is not shown, the same below) arranged at the bottom of the mounting base plate 52. Specifically, the mounting base plate 52 is in an H-shaped shape, and mounting pins 76 are respectively traversed on the notches on both sides thereof. There are four clamping jaws 71, and each clamping jaw 71 is in a long block shape. Two clamping jaws 71 are respectively sleeved on each mounting pin 76, and each clamping jaw 71 can rotate relative to the mounting pin 76, and the top ends of the two clamping jaws 71 on each mounting pin 76 are connected as a whole through a connecting pin 75. The two connecting pins 75 are respectively provided with a first mounting hole (not shown) with a left-handed internal thread and a second mounting hole (not shown) with a right-handed internal thread. The clamping screw 72 is a stepped shaft with a large middle and small ends. The two ends are respectively provided with a left-handed external thread (not shown) and a right-handed external thread (not shown). The two ends of the clamping screw 72 are respectively screwed into the first mounting hole and the second mounting hole. The middle part of the clamping screw 72 is provided with a limit cam 73, which is inserted into the limit groove 521 of the mounting base 52, so that the clamping screw 72 is axially limited, that is, the clamping screw 72 can only rotate. When the clamping screw 72 is rotated, the external threads at both ends drive the connecting pins 75 on both sides to move in the same direction or in the opposite direction, thereby driving the clamping jaws 71 to swing in the same direction or in the opposite direction to clamp the rail 10. Further, in order to enable each clamping jaw 71 to better clamp the rail 10, the inner side of each clamping jaw 71 is provided with a pin 711 for clamping the surface of the rail 10. To facilitate the rail clamping operation, one end of the clamping screw 72 is provided with a rail clamping handle 74.

[0035] The rail cutting structure includes a housing 1, a band saw blade 2, a transmission wheel and a transmission mechanism 9, and the band saw blade 2, the transmission wheel and the transmission mechanism 9 are all arranged in the housing 1. In this embodiment, the housing 1 has a triangular shape as a whole, and a first cavity 11 and a second cavity 12 are formed on the front and rear sides thereof, respectively, and the band saw blade 2 and the transmission wheel are respectively arranged in the first cavity 11. Specifically, there are two transmission wheels, which are a left transmission wheel 211 and a right transmission wheel 212, respectively. A first tensioning wheel 22 is also arranged in the first cavity 11, and the first tensioning wheel 22, the left transmission wheel 211 and the right transmission wheel 212 are arranged in a triangular shape and matched with the first cavity 11, that is, the first tensioning wheel 22 is arranged in the upper part of the first cavity 11, and the left and right transmission wheels 211, 212 are respectively arranged in the lower part of the first cavity 11, and the band saw blade 2 is tensioned on the first tensioning wheel 22, the left transmission wheel 211 and the right transmission wheel 212 in sequence to form a closed triangular shape. The present invention adopts a dual transmission wheel to drive the band saw blade 2. Under the premise of ensuring the friction force required for transmission, compared with the existing single-wheel drive, the present invention can use a transmission wheel with a smaller wheel diameter without increasing the transmission wheel wrap angle, thereby reducing the overall weight of the rail cutting machine and stabilizing rail cutting. At the same time, it can also reduce the tension of the band saw blade 2, thereby extending the service life of the band saw blade 2. Further, a U-shaped rail cutting notch 16 is formed at the lower end of the housing 1, and one section of the band saw blade 2 is exposed in the rail cutting notch 16. The two ends of the rail cutting notch 16 along the direction in which the band saw blade 2 passes are respectively provided with a limiting guide structure 23 for limiting and guiding the band saw blade 2 to move in the rail cutting notch 16. In this way, the first tensioning wheel 22, the left transmission wheel 211 and the right transmission wheel 212 are arranged in a triangle, that is, the left and right transmission wheels 211, 212 are respectively located on the left and right sides of the rail cutting notch 16, and the first tensioning wheel 22 is located above the rail cutting notch 16. The slotting height of the rail cutting notch 16 is not affected by the transmission wheels on both sides. In this way, the height of the rail cutting notch 16 can be changed as needed without changing the size of the transmission wheels, thereby making the rail cutting machine suitable for rail cutting operations of different specifications. In addition, the band saw blade 2 is arranged in a triangle, so that the band saw blade 2 is always bent on one side and is not affected by the reverse alternating force, thereby further extending the service life of the band saw blade 2. To facilitate the rail cutting operation, the clamping jaw 71 is opposite to the rail cutting notch 16 in the working state.

[0036] Furthermore, each of the above-mentioned limiting guide structures 23 includes a base 231, a guide block 233 and a guide wheel 232. Each base 231 is fixed on the outer shell 1, and each base 231 is respectively provided with two guide blocks 233 and two guide wheels 95. There is a gap between the upper and lower guide wheels 95, and there is a gap between the two upper and lower guide blocks 233 to form a guide through-hole 234 extending along the length direction of the band saw blade 2. The band saw blade 2 is passed through the gap between the two guide wheels 95 and the above-mentioned guide through-hole, thereby playing a limiting and guiding role for the band saw blade 2.

[0037] Furthermore, the first tensioning wheel 22 is mounted on a tensioning wheel shaft 221, and the tensioning wheel shaft 221 is movable to drive the first tensioning wheel 22 to tension or loosen the band saw blade 2. In this way, the rail cutting depth can be adjusted according to the position of the first tensioning wheel 22, and the left and right transmission wheels 211, 212 are only responsible for driving the band saw blade 2 to move. The tensioning wheel shaft 221 is arranged horizontally and has a screw hole (not shown) thereon, and a first tensioning screw 222 is passed through the screw hole. The first tensioning screw 222 is axially fixed on the housing 1, and a first hexagonal head 223 is provided at the upper end of the first tensioning screw 222, so that a torque wrench can be used to adjust the first tensioning screw 222 during rail cutting operation, thereby adjusting the position of the first tensioning wheel 22 to achieve tensioning or loosening of the band saw blade 2.

[0038] The transmission mechanism 9 is arranged in the second cavity 12, and includes a synchronous belt 91, a driving wheel 92, a driven wheel 93, a second tensioning wheel 94 and a guide wheel 95. The synchronous belt 91 is tensioned on the synchronous belt 91, the driving wheel 92, the driven wheel 93, the second tensioning wheel 94 and the guide wheel 95 in sequence to form a closed loop. The driving wheel 92 is linked with the power output shaft of the driving device 3, and each driving wheel 92 is linked with the right transmission wheel 212 through the driving shaft 921. The driven wheel 93 is one and is linked with the left transmission wheel 211 through the driven shaft 931. In addition, relative to the setting positions of the left and right transmission wheels 211 and 212, the driven wheel 93 and the driving wheel 92 are respectively arranged on the left and right sides of the lower part of the second cavity 12. The guide wheels 95 are two and are arranged at intervals on the upper part of the second cavity 12. The two guide wheels 95 can make the synchronous belt 91 move in a certain direction. The above-mentioned second tensioning wheel 94 is located between the driving wheel 92 and the driven wheel 93 and below the two guide wheels 95. Specifically, a tensioning groove 941 is fixed on the above-mentioned shell 1, and a sliding seat 942 is embedded in the tensioning groove 941. The above-mentioned second tensioning wheel 94 is fixed to one end of the sliding seat 942, and the other end of the sliding seat 942 is provided with a threaded hole (not shown) and is penetrated by a second tensioning screw 943, that is, the lower end of the second tensioning screw 943 is provided with an external thread (not shown) and is penetrated on the sliding seat 942, and its upper end is connected to the fixed block 945, and a second hexagonal head 944 is provided on its upper end, and a spring 946 is sleeved on the second tensioning screw 943 between the second hexagonal head 944 and the fixed block 945, and the spring 946 is limited between the second hexagonal head 944 and the fixed block 945. In this way, the tension of the synchronous belt 91 can be adjusted by adjusting the screwing length of the second tensioning screw 943 .

[0039] After the corresponding components are installed in the first cavity 11 and the second cavity 12, they are respectively sealed by the front and rear side plates 13 and 14, and the outer surface of the front side plate 13 forms a flat end plane. The connecting frame 8 also includes a second connecting plate 82 fixed to the outer shell 1, and the angle between the second connecting plate 82 and the end plane is 45 degrees. At the same time, the setting direction of each guide block 233 is also 45 degrees to the end plane, so that the band saw blade 2 and the rail 10 are at an angle of 90 degrees, ensuring that the band saw blade 2 cuts into the rail 10 vertically.

[0040] In addition, to facilitate daily rail cutting operations, the rail cutting machine of the present invention is also equipped with a lithium battery 4. Specifically, the lithium battery 4 is installed on the rear side plate 14 of the outer shell 1, and handles 15 are respectively provided on the left and right sides of the outer shell 1 to facilitate the carrying and transportation of the rail cutting structure.

[0041] The working principle of the present invention is as follows:

[0042] During the rail cutting operation, first, the band saw blade 2 is passed through the left transmission wheel 211, the first tensioning wheel 22, the right transmission wheel 212 and the limiting guide structure 23 in sequence, and the first hexagonal head 223 is rotated to tension the band saw blade 2; then, the rail clamping mechanism 7 on the mounting bracket 5 is clamped at the position to be cut of the rail 10, and the rail cutting structure is installed on the mounting bracket 5, and the position of the rail cutting structure is adjusted by the feed handle 65 respectively so that the saw blade is close to the upper surface of the rail 10; finally, the motor is started to drive the band saw blade 2 through the left and right transmission wheels 211, 212, and the feed hand wheel 64 is rotated to make the band saw blade 2 cut the rail 10 downward and use cooling water to immediately cool the cut portion until the rail 10 is completely cut.

Claims

1. A band saw rail cutting machine, comprising a rail cutting structure and a driving device (3), wherein the rail cutting structure comprises a band saw blade (2), characterized in that: It also comprises at least two transmission wheels, and the band saw blade (2) is tensioned on each of the transmission wheels in sequence; It also includes a transmission mechanism (9), which can transmit the driving force of the driving device (3) to each transmission wheel so that each transmission wheel rotates synchronously and drives the band saw blade (2); There are two transmission wheels, namely a left transmission wheel (211) and a right transmission wheel (212). The rail cutting structure also includes a first tensioning wheel (22). The first tensioning wheel (22), the left transmission wheel (211) and the right transmission wheel (212) are arranged in a triangle. The band saw blade (2) is tensioned on the first tensioning wheel (22), the left transmission wheel (211) and the right transmission wheel (212) in sequence to form a closed triangle shape. It also comprises a housing (1), the rail cutting structure and the transmission mechanism (9) are both arranged in the housing (1), and a rail cutting notch (16) is formed at one end of the housing (1), and one section of the band saw blade (2) is exposed in the rail cutting notch (16); The two ends of the rail cutting notch (16) along the direction in which the band saw blade (2) passes through are respectively provided with limiting guide structures (23) for limiting and guiding the band saw blade (2) to move in the rail cutting notch (16); each limiting guide structure (23) comprises a base (231), a guide block (233) and a guide wheel (232); each base (231) is fixed on the housing (1); and each base (231) is respectively provided with two guide blocks (233) and two guide wheels (95) on the upper and lower sides; there is a gap between the upper and lower guide wheels (95); there is a gap between the two upper and lower guide blocks (233) to form a guide passing opening (234) extending along the length direction of the band saw blade (2); the band saw blade (2) passes through the gap between the two guide wheels (95) and the above-mentioned guide passing opening; The invention also comprises a mounting bracket (5), on which a rail clamping mechanism (7) and a feeding mechanism (6) are arranged, wherein the feeding mechanism (6) comprises a feeding slider (61) movable relative to the mounting bracket (5), and the rail cutting structure and the feeding slider (61) are linked in a detachable manner so that the rail cutting structure can be displaced relative to the mounting bracket (5); The mounting bracket (5) comprises a mounting top plate (51), a mounting bottom plate (52) and left and right side plates (53, 54) respectively connected to the mounting top plate (51) and the mounting bottom plate (52). The rail clamping mechanism (7) comprises a clamping claw (71) and a clamping screw (72) arranged at the bottom of the mounting bottom plate (52). The mounting bottom plate (52) is in an H-shaped shape, and mounting pins (76) are respectively traversed on the notches on both sides. There are four clamping claws (71), and each clamping claw (71) is in a long block shape. Two clamping claws (71) are respectively sleeved on each mounting pin (76), and each clamping claw (71) can rotate relative to the mounting pin (76). The top ends of the two clamping jaws (71) are connected as a whole through a connecting pin shaft (75), and a first mounting hole with a left-handed internal thread and a second mounting hole with a right-handed internal thread are respectively opened on the two connecting pin shafts (75). The clamping screw (72) is a stepped shaft with a large size in the middle and small sizes at both ends, and a left-handed external thread and a right-handed external thread are respectively arranged at its two ends. The two ends of the clamping screw (72) are respectively screwed into the first mounting hole and the second mounting hole, and a limiting cam (73) is arranged in the middle of the clamping screw (72). The limiting cam (73) is clamped in a limiting groove (521) located on the mounting base plate (52), and the inner side surface of each clamping jaw (71) is provided with a pin (711) for clamping the surface of the rail (10).

2. The rail band saw cutting machine according to claim 1, characterized in that: The transmission mechanism (9) comprises a synchronous belt (91), a driving wheel (92) and at least one driven wheel (93); the synchronous belt (91) is sequentially tensioned on the driving wheel (92) and each driven wheel (93) to form a closed loop; the total number of the driving wheels (92) and the driven wheels (93) matches the number of the transmission wheels; the driving wheel (92) is linked to the power output shaft of the driving device (3); the driving wheel (92) is linked to one of the transmission wheels via a driving shaft (921); and each driven wheel (93) is linked to the corresponding remaining transmission wheels via a driven shaft (931).

3. The rail cutting band saw according to claim 1, characterized in that: The first tensioning wheel (22) is mounted on a tensioning wheel shaft (221), and the tensioning wheel shaft (221) is movable to drive the first tensioning wheel (22) to tension or loosen the band saw blade (2).

4. The rail cutting band saw according to claim 2, characterized in that: The transmission mechanism (9) further comprises a second tensioning wheel (94) and a tensioning wheel sliding assembly. The synchronous belt (91) is tensioned on the driving wheel (92), each driven wheel (93) and the second tensioning wheel (94) in sequence to form a closed loop. The second tensioning wheel (94) can move under the drive of the tensioning wheel sliding assembly to tension or loosen the synchronous belt (91).

5. The rail cutting band saw machine according to claim 2 or 4, characterized in that: The transmission mechanism (9) further comprises a guide wheel (95), and the synchronous belt (91) is sequentially tensioned on the driving wheel (92), each driven wheel (93) and the guide wheel (95) to form a closed loop; or, the synchronous belt (91) is sequentially tensioned on the driving wheel (92), each driven wheel (93), the second tensioning wheel (94) and the guide wheel (95) to form a closed loop.

6. The rail cutting band saw machine according to claim 1, characterized in that: The left and right transmission wheels (211, 212) are respectively located on the left and right sides of the track cutting notch (16), and the first tensioning wheel (22) is located above the track cutting notch (16).

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