Metal bar cutting machine

Abstract

The invention relates to the technical field of metal cutting, in particular to a metal bar cutting machine which comprises a workbench and is characterized in that the upper end of the workbench is fixedly connected with a mounting base, and the upper end of the mounting base is fixedly connected with a limiting mechanism capable of limiting and fixing a metal bar; the upper end of the mounting base is further fixedly provided with a moving mechanism capable of moving the metal bar, the moving mechanism is located on the left side of the limiting mechanism, the upper end of the mounting base is further fixedly provided with a rotating mechanism capable of rotating the metal bar, and the rotating mechanism is located between the moving mechanism and the limiting mechanism; an electric arm is rotatably connected to the upper end of the workbench, a protective cover is fixedly connected to the outer wall of the electric arm, the cutting saw blade can cut metal bars, after the metal bars are cut, the cut bars can fall into a collecting box, the collecting box can collect the metal bars, and a driving motor is further fixedly installed on the left side of the protective cover. And the output end of the driving motor is fixedly connected with the cutting saw blade.

Description

Technical Field

[0001] The present invention relates to the technical field of metal cutting, and particularly to a metal bar cutting machine. Background Art

[0002] In the modern metal processing industrial system, metal bar cutting, as a basic and extremely crucial process, is widely used in many fields such as mechanical manufacturing, building material processing, and automotive component production. From the manufacturing of components for precision instruments to the processing of large building structural components, the quality and efficiency of metal bar cutting directly affect the final product quality and the production efficiency of enterprises. Traditional metal bar cutting equipment and processes have exposed a series of serious problems. During the cutting process, the bar is often fixed in a static state, and the heat in the cutting area is difficult to dissipate evenly, resulting in too high local temperature on the cutting surface. This not only increases the roughness of the cutting surface, causes defects such as deformation and microcracks, greatly affecting the product appearance and dimensional accuracy, but also changes the microstructure and mechanical properties of the metal material, reducing the strength, toughness, and corrosion resistance of the product. In severe cases, it even scrapps the product, increasing production costs.

[0003] Chinese Patent (Publication No. CN107639281A) discloses a metal bar cutting machine, including a chassis. It is characterized in that: on one side inside the chassis, there is a driving device. At one end of the main shaft, the driving device is also fixedly connected with a fixing frame. There are protrusions on the fixing frame, and there is a shaft column on the protrusions. A clamping mechanism is movably connected to the shaft column. There is a cutting tool on the main shaft, and there is a handle on the clamping mechanism. This invention clamps the metal bar through the clamping mechanism, holds the handle by hand to drive the clamping mechanism to rotate with the shaft column as the fulcrum, sends the metal bar to the position of the cutting tool for cutting, and protects the cutting tool and the driving device through the protective cover and the cutting tool cover, extending the service life.

[0004] According to the above solution, when the above solution is used, only the driving device is protected by the protective cover. It is impossible to drive the metal bar to rotate when cutting the metal bar, and it is also impossible to push the metal bar after cutting. To solve the problems of not being able to drive the metal bar to rotate when cutting the metal bar and not being able to push the metal bar after cutting, for this reason, we have proposed a metal bar cutting machine. Summary of the Invention

[0005] The purpose of the present invention is to provide a metal bar cutting machine to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A metal bar cutting machine, comprising a workbench, characterized in that an installation base is fixedly connected to the upper end of the workbench, a limiting mechanism for limiting and fixing the metal bar is fixedly connected to the upper end of the installation base, a moving mechanism for moving the metal bar is fixedly installed on the upper end of the installation base, the moving mechanism is located on the left side of the limiting mechanism, and a rotating mechanism for rotating the metal bar is fixedly installed on the upper end of the installation base; A power arm is rotatably connected to the upper end of the workbench, a protective cover is fixedly connected to the outer wall of the power arm, a cutting saw blade is rotatably connected to the inside of the protective cover, the cutting saw blade is a disc-type cutting tool with high speed rotation, high hardness and wear resistance, the cutting saw blade is powered by a driving motor, during cutting, the limiting mechanism can firmly fix the metal bar to prevent it from shaking, the moving mechanism can accurately adjust the position of the metal bar, the rotating mechanism can drive the metal bar to rotate, so that the cutting saw blade can evenly cut the metal bar and cut the metal bar into segments of the required length, when the metal bar cutting is completed, the cut bar will fall into the collection box, and the collection box will collect the metal bar, a driving motor is also fixedly installed on the left side of the protective cover, and the output end of the driving motor is fixedly connected to the cutting saw blade.

[0007] Preferably, the limiting mechanism includes a first mounting plate, a mating pipe is fixedly connected to the upper end of the first mounting plate, the first mounting plate is fixedly connected to the upper end of the installation base, a second mounting plate is also fixedly connected to the upper end of the installation base, several sliding rods are fixedly connected between the second mounting plate and the first mounting plate, a butting pipe and a fourth mounting plate are also arranged between the second mounting plate and the first mounting plate, and a plurality of rectangular grooves are formed on the outer walls of the first mounting plate and the fourth mounting plate.

[0008] Preferably, a moving block is slidably connected to the inner wall of each rectangular groove, a butting rod is fixedly connected to one end of the moving block close to the butting pipe, and several first elastic telescopic arms are arranged on the opposite sides of the first mounting plate and the fourth mounting plate, and each first elastic telescopic arm is fixedly connected to an adjacent moving block.

[0009] Preferably, several first butting wheels are also arranged on the left side of the first mounting plate, each first butting wheel is rotatably connected to an adjacent first elastic telescopic arm, the butting pipe and the fourth mounting plate are slidably connected to the outer walls of all the sliding rods, the butting pipe is connected to the first mounting plate through a plurality of first springs, each first spring is sleeved on the outer wall of the sliding rod, and the butting pipe is connected to the fourth mounting plate through a plurality of second springs, and each second spring is sleeved on the outer wall of the adjacent sliding rod.

[0010] Preferably, the rotating mechanism includes a third mounting plate which is slidably connected to the outer wall of the sliding rod. The third mounting plate is located between the fourth mounting plate and the second mounting plate, and is fixedly connected to the fourth mounting plate through a second elastic telescopic arm.

[0011] Preferably, the left end of the inner wall of the second elastic telescopic arm is fixedly connected to the protective cover through a first pulling rope. The outer wall of the first pulling rope also slidably passes through the inside of the fitting pipe, the abutting pipe and the fourth mounting plate. A plurality of second abutting wheels are arranged on the right side of the fourth mounting plate, and each second abutting wheel is rotatably connected to the adjacent first elastic telescopic arm.

[0012] Preferably, the second abutting wheel is fixedly connected to the first elastic telescopic arm through a first return torsion spring. One end of the second abutting wheel away from the fourth mounting plate is fixedly connected to a first air pipe, and a second pulling rope is wound around the outer wall of the first air pipe. The free end of the second pulling rope is fixedly connected to the third mounting plate.

[0013] Preferably, the moving mechanism includes a fixing plate which is fixedly connected to the upper end of the mounting base. Two second air pipes are fixedly connected to the right end of the fixing plate. A rectangular frame is fixedly connected between the two second air pipes. A plurality of rotating plates are rotatably connected inside the rectangular frame. A second return torsion spring is fixedly connected between the rotating plate and the inner wall of the second abutting wheel. A third abutting wheel is also rotatably connected inside the rotating plate, and a rotating block is fixedly connected to the right end of the third abutting wheel.

[0014] Preferably, a plurality of activity grooves are formed inside the rotating block, and a second tooth with a reset function is slidably connected inside each activity groove. An installation round box is arranged on the right side of the rotating block, and the installation round box is fixedly connected to the rectangular frame through a connecting arm. The rotating block is located inside the installation round box.

[0015] Preferably, a plurality of first teeth are fixedly connected to the inner wall of the installation round box. The outer wall of the second tooth abuts against the inner wall of the installation round box. The rectangular frame is fixedly connected to the second mounting plate through a first air pipe, and the first air pipe is fixedly communicated with the two second air pipes through a pipeline.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the present invention is in use, when the second abutting wheel resets and rotates, it will drive the metal bar to rotate. When the cutting saw blade cuts the rotating metal bar, the outer wall of the disc cutter will not always stay on the cross-section of the metal bar, which can effectively avoid problems such as overheating of the cross-section of the metal bar caused by long-term contact friction heat generation, and further problems such as changes in metal properties, uneven hardness at the cut, or cracks.

[0017] 2. When the present invention is in use, when the rectangular frame is reset, the third abutting wheel will rotate in the opposite direction on the outer wall of the metal bar. Since the other end of the first tooth will abut against the second tooth and be engaged with each other, and since the third abutting wheel cannot rotate, a pulling action will be exerted on the metal, so that the metal bar can be cut for the second time without manual movement, with simple operation and no need for manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view of a metal bar cutting machine.

[0019] Figure 2 is the schematic diagram of the position structure of the collection box in a metal bar cutting machine.

[0020] Figure 3 is the schematic diagram of the position structure of the protective cover in a metal bar cutting machine.

[0021] Figure 4 is the schematic diagram of the structure of the limiting mechanism in a metal bar cutting machine.

[0022] Figure 5 is the schematic diagram of the position structure of the abutting pipe in a metal bar cutting machine.

[0023] Figure 6 is the schematic diagram of the structure of the rotating mechanism in a metal bar cutting machine.

[0024] Figure 7 is the schematic diagram of the position structure of the rotating plate in a metal bar cutting machine.

[0025] Figure 8 is the schematic diagram of the internal structure of the installation round box in a metal bar cutting machine.

[0026] Figure 9 is the schematic diagram of the internal structure of the movable groove in a metal bar cutting machine.

[0027] In the figure: 1, workbench; 2, collection box; 5, electric arm; 6, drive motor; 7, protective cover; 8, sleeve; 9, cutting saw blade; 10, installation base; 11, first installation plate; 12, sliding rod; 13, second installation plate; 14, first spring; 15, second spring; 16, abutting pipe; 17, rectangular groove; 18, first abutting wheel; 19, first elastic telescopic arm; 20, moving block; 21, first pull rope; 22, second elastic telescopic arm; 23, third installation plate; 24, fitting pipe; 25, abutting rod; 26, second pull rope; 27, second abutting wheel; 28, first air pipe; 29. Third abutting wheel; 30. Installation round box; 31. Rotating plate; 32. First tooth; 33. Second tooth; 34. Rotating block; 35. Third spring; 36. Moving groove; 37. Fourth mounting plate; 38. Second air pipe; 39. Fixed plate; 40. Rectangular frame; 101. Limiting mechanism; 201. Moving mechanism; 301. Rotating mechanism. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1: Please refer to Figures 1 to 3 As shown in the figure, in the embodiment of the present invention, a metal bar cutting machine includes a workbench 1. A mounting base 10 is fixedly connected to the upper end of the workbench 1. A limiting mechanism 101 capable of limiting and fixing the metal bar is fixedly connected to the upper end of the mounting base 10. A moving mechanism 201 capable of moving the metal bar is also fixedly installed on the upper end of the mounting base 10. The moving mechanism 201 is located on the left side of the limiting mechanism 101. A rotating mechanism 301 capable of rotating the metal bar is also fixedly installed on the upper end of the mounting base 10. A power arm 5 is rotatably connected to the upper end of the workbench 1. A protective cover 7 is fixedly connected to the outer wall of the power arm 5. A cutting saw blade 9 is rotatably connected inside the protective cover 7. The cutting saw blade 9 is a high-speed rotating disc-type cutting tool with high hardness and wear resistance. The cutting saw blade 9 is powered by a driving motor 6. During cutting, the limiting mechanism 101 can firmly fix the metal bar to prevent shaking. The moving mechanism 201 can accurately adjust the position of the metal bar. The rotating mechanism 301 can drive the metal bar to rotate, so that the cutting saw blade 9 can evenly cut the metal bar and cut the metal bar into segments of the required length. After the metal bar is cut, the cut bar will fall into the collection box 2, and the collection box 2 will collect the metal bar. A driving motor 6 is also fixedly installed on the left side of the protective cover 7, and the output end of the driving motor 6 is fixedly connected to the cutting saw blade 9.

[0030] Embodiment 2: Please refer to Figures 3 to 6, the limiting mechanism 101 includes a first mounting plate 11, the first mounting plate 11 is fixedly connected to the upper end of the mounting base 10, the upper end of the mounting base 10 is also fixedly connected with a second mounting plate 13, the right end of the second mounting plate 13 is fixedly connected with a sleeve 8, and a plurality of sliding rods 12 are fixedly connected between the second mounting plate 13 and the first mounting plate 11. A butt joint pipe 16 and a fourth mounting plate 37 are also arranged between the second mounting plate 13 and the first mounting plate 11. The fourth mounting plate 37 is composed of two conical pipes connected to each other and is in a funnel shape. The first pull rope 21 and the fourth mounting plate 37 are symmetrically distributed left and right between the first mounting plate 11 and the second mounting plate 13. A plurality of rectangular grooves 17 are formed on the outer walls of the first mounting plate 11 and the fourth mounting plate 37. The plurality of rectangular grooves 17 are annularly distributed. A moving block 20 is slidably connected to the inner wall of each rectangular groove 17. One end of the moving block 20 close to the butt joint pipe 16 is fixedly connected with a butt joint rod 25. A plurality of first elastic telescopic arms 19 are arranged on the opposite sides of the first mounting plate 11 and the fourth mounting plate 37. The plurality of first elastic telescopic arms 19 are annularly distributed on the opposite sides of the first mounting plate 11 and the fourth mounting plate 37. Each first elastic telescopic arm 19 is fixedly connected with an adjacent moving block 20. A plurality of first abutting wheels 18 are also arranged on the left side of the first mounting plate 11. The plurality of first abutting wheels 18 are annularly distributed on the left side of the first mounting plate 11. Each first abutting wheel 18 is rotatably connected to an adjacent first elastic telescopic arm 19 through a rotating shaft. The outer wall of the first abutting wheel 18 is provided with a curved surface. When the outer wall of the first abutting wheel 18 abuts against the outer wall of the metal bar, the curved surface of the first abutting wheel 18 can better fit the bar; Both the butt joint pipe 16 and the fourth mounting plate 37 are slidably sleeved on the outer wall of the sliding rod 12. Specifically, a plurality of sliding openings are formed on the outer walls of the fourth mounting plate 37 and the butt joint pipe 16. The inner wall of each sliding opening is slidably connected to the outer wall of the adjacent sliding rod 12. Lubricating oil is applied to the inner wall of the sliding opening and the outer wall of the sliding rod 12. When the fourth mounting plate 37 and the butt joint pipe 16 slide on the outer wall of the sliding rod 12 through the sliding openings, the sliding rod 12 can limit the fourth mounting plate 37 and the butt joint pipe 16 through the sliding openings and also has a guiding function, thereby improving the stability of the movement of the butt joint pipe 16 and the fourth mounting plate 37. The lubricating oil can also reduce the friction between the sliding opening and the outer wall of the sliding rod 12 and extend the service life of the sliding opening and the sliding rod 12. The butt joint pipe 16 is connected to the first mounting plate 11 through a plurality of first springs 14. Each first spring 14 is sleeved on the outer wall of the sliding rod 12. The butt joint pipe 16 is connected to the fourth mounting plate 37 through a plurality of second springs 15. Each second spring 15 is sleeved on the outer wall of the adjacent sliding rod 12. The elastic coefficient of the first spring 14 is less than the elastic coefficient of the second spring 15.

[0031] Please refer to Figures 4 to 6, the rotating mechanism 301 includes a third mounting plate 23. The third mounting plate 23 is slidably connected to the outer wall of the sliding rod 12. The third mounting plate 23 is located between the fourth mounting plate 37 and the second mounting plate 13. The third mounting plate 23 and the fourth mounting plate 37 are fixedly connected by a second elastic telescopic arm 22. The elastic coefficient of the second elastic telescopic arm 22 is greater than that of the second spring 15. The left end of the inner wall of the second elastic telescopic arm 22 is fixedly connected to the protective cover 7 by a first pull rope 21. The upper end of the first mounting plate 11 is fixedly connected with a mating tube 24. And the first pull rope 21 respectively slides through the mating tube 24, the abutting tube 16 and the inside of the fourth mounting plate 37. A plurality of second abutting wheels 27 are arranged on the right side of the fourth mounting plate 37. The plurality of second abutting wheels 27 are annularly distributed on the right side of the fourth mounting plate 37. Each second abutting wheel 27 is rotatably connected to the adjacent first elastic telescopic arm 19 by a rotating shaft. The second abutting wheel 27 and the first elastic telescopic arm 19 are clamped by a first return torsion spring. The return torsion spring can drive the second abutting wheel 27 to quickly reset. One end of the second abutting wheel 27 away from the fourth mounting plate 37 is fixedly connected with a first air pipe 28. A second pull rope 26 is wound around the outer wall of the first air pipe 28. The free end of the second pull rope 26 is fixedly connected to the third mounting plate 23; Specifically, when the third mounting plate 23 moves towards the fourth mounting plate 37, the return torsion spring at this time will drive the first air pipe 28 to reset and rotate. The first air pipe 28 will retract the second pull rope 26. At this time, the outer walls of all the second abutting wheels 27 will abut against the outer wall of the bar metal. When the second abutting wheel 27 resets and rotates, it will drive the metal bar to rotate.

[0032] Please refer to Figures 4 to 9 , the moving mechanism 201 includes a fixing plate 39. The fixing plate 39 is fixedly connected to the upper end of the mounting base 10. The right end of the fixing plate 39 is fixedly connected with two second air pipes 38. A rectangular frame 40 is fixedly connected between the two second air pipes 38. A plurality of rotating plates 31 are rotatably connected inside the rectangular frame 40. The rectangular frame 40 is located between the third mounting plate 23 and the fourth mounting plate 37. The plurality of rotating plates 31 are annularly distributed inside the second abutting wheel 27. The rotating plate 31 and the second abutting wheel 27 are clamped by a second return torsion spring. The second return torsion spring can drive the rotating plate 31 to quickly reset. The rotating plate 31 is in an "L" shape. A third abutting wheel 29 is also rotatably connected to the inside of the rotating plate 31 by a rotating shaft. The right end of the third abutting wheel 29 is fixedly connected with a rotating block 34. A plurality of movable grooves 36 are formed inside the rotating block 34. A second tooth 33 with a reset function is slidably connected to each movable groove 36. The second tooth 33 and the inner wall of the movable groove 36 are connected by a third spring 35. The third spring 35 can drive the second tooth 33 to quickly reset. An installation round box 30 is arranged on the right side of the rotating block 34. The installation round box 30 and the rectangular frame 40 are fixedly connected by a connecting arm; The rotating block 34 is located inside the mounting round box 30. A number of first teeth 32 are fixedly connected to the inner wall of the mounting round box 30. The outer wall of the second teeth 33 abuts against the inner wall of the mounting round box 30. The rectangular frame 40 and the second mounting plate 13 are fixedly connected by a first air pipe 28. The first air pipe 28 is fixedly communicated with two second air pipes 38 through pipes.

[0033] The working principle of the present invention is as follows: When the present invention is in use, a metal bar is passed through the inside of the sleeve 8, the second mounting plate 13, the third mounting plate 23, the fourth mounting plate 37, the abutting pipe 16, the rectangular frame 40 and the first mounting plate 11. The metal bar is located directly below the cutting saw blade 9. At this time, the electric arm 5 is started to drive the protective cover 7 and the cutting saw blade 9 to move downward. Then the drive motor 6 is started to drive the cutting saw blade 9 to rotate at a high speed. When the protective cover 7 moves downward, the protective cover 7 will pull the first pull rope 21. The first pull rope 21 will pull the third mounting plate 23. The third mounting plate 23 will move along the outer wall of the sliding rod 12. The third mounting plate 23 moves the fourth mounting plate 37 through the second elastic telescopic arm 22. The fourth mounting plate 37 drives the abutting pipe 16 to move through the second spring 15. The abutting pipe 16 will squeeze the first spring 14. Since the elastic coefficient of the first spring 14 is the lowest, the inner wall of the abutting pipe 16 will first abut against the outer wall of the abutting rod 25 on the left side of the first mounting plate 11. When the abutting pipe 16 moves towards the first mounting plate 11, all the abutting rods 25 will drive the moving block 20 to move towards the center inside the first mounting plate 11. The moving block 20 will drive the first elastic telescopic arm 19 to move. At this time, all the first abutting wheels 18 will abut against the outer wall of the metal bar to fix the metal bar; And when the third mounting plate 23 moves, when the third mounting plate 23 moves towards the fourth mounting plate 37, the reset torsion spring will drive the first air pipe 28 to rotate back. The first air pipe 28 will recycle the second pull rope 26. At this time, the outer walls of all the second abutting wheels 27 will abut against the outer wall of the bar metal. When the second abutting wheels 27 rotate back, they will drive the metal bar to rotate. When the cutting saw blade 9 cuts the rotating metal bar, the outer wall of the disc cutter will not stay on the cross-section of the metal bar all the time. This can effectively avoid problems such as overheating of the cross-section of the metal bar due to long-term contact and friction heat generation, resulting in changes in metal properties, uneven hardness at the cut, or cracks; Meanwhile, when the metal bar passes through the inside of the rectangular frame 40, the outer wall of the metal bar abuts against the outer wall of the third abutting wheel 29, the rotating plate 31 rotates, and the reset torsion spring drives the third abutting wheel 29 to tightly abut against the outer wall of the metal bar through the rotating plate 31, so as to fix and limit the metal bar. When the third mounting plate 23 moves, it will squeeze the first air pipe 28, and the gas inside the first air pipe 28 will enter the second air pipe 38. The second air pipe 38 drives the rectangular frame 40 to move, and the rectangular frame 40 will pass through the inside of the third mounting plate 23. When the third abutting wheel 29 rotates, the third abutting wheel 29 will drive the rotating block 34 to rotate, and the rotating block 34 drives all the second teeth 33 to rotate. The inclined surface of the second teeth 33 will abut against the first teeth 32, and the second teeth 33 will move into the movable groove 36. When the cutting is completed, the protective cover 7 resets and releases the first pull rope 21. At this time, the third mounting plate 23 will reset under the action of the second elastic telescopic arm 22, and the first air pipe 28 will suck the second air pipe 38, and the second air pipe 38 drives the rectangular frame 40 to reset. When the rectangular frame 40 resets, the third abutting wheel 29 will rotate in the opposite direction on the outer wall of the metal bar. Since the other end of the first teeth 32 will abut against the second teeth 33 and be mutually engaged, and since the third abutting wheel 29 cannot rotate, it will pull the metal, and the metal bar can be cut for the second time without manual movement.

[0034] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A metal bar cutting machine, comprising a workbench (1), characterized in that, The upper end of the workbench (1) is fixedly connected with an installation base (10). The upper end of the installation base (10) is fixedly connected with a limiting mechanism (101) that can limit and fix the metal bar. The upper end of the installation base (10) is also fixedly installed with a moving mechanism (201) that can move the metal bar. The moving mechanism (201) is located on the left side of the limiting mechanism (101). The upper end of the installation base (10) is also fixedly installed with a rotating mechanism (301) that can rotate the metal bar. The upper end of the workbench (1) is rotatably connected with an electric arm (5). The outer wall of the electric arm (5) is fixedly connected with a protective cover (7). The inside of the protective cover (7) is rotatably connected with a cutting saw blade (9). The cutting saw blade (9) is a high-speed rotating disc-type cutting tool with high hardness and wear resistance. The cutting saw blade (9) is powered by a driving motor (6). During cutting, the limiting mechanism (101) can firmly fix the metal bar to prevent it from shaking. The moving mechanism (201) can accurately adjust the position of the metal bar. The rotating mechanism (301) can drive the metal bar to rotate, so that the cutting saw blade (9) can evenly cut the metal bar and cut the metal bar into segments of the required length. After the metal bar is cut, the cut bar will fall into the collection box (2) inside, and the collection box (2) will collect the metal bar. The driving motor (6) is also fixedly installed on the left side of the protective cover (7). The output end of the driving motor (6) is fixedly connected with the cutting saw blade (9).

2. The metal bar cutting machine according to claim 1, characterized in that, The limiting mechanism (101) includes a first mounting plate (11). The upper end of the first mounting plate (11) is fixedly connected with a mating pipe (24). The first mounting plate (11) is fixedly connected to the upper end of the installation base (10). The upper end of the installation base (10) is also fixedly connected with a second mounting plate (13). A plurality of sliding rods (12) are fixedly connected between the second mounting plate (13) and the first mounting plate (11). An abutting pipe (16) and a fourth mounting plate (37) are also arranged between the second mounting plate (13) and the first mounting plate (11). A plurality of rectangular grooves (17) are opened on the outer walls of the first mounting plate (11) and the fourth mounting plate (37).

3. The metal bar cutting machine according to claim 2, wherein, A moving block (20) is slidably connected to the inner wall of each rectangular groove (17). One end of the moving block (20) close to the abutting pipe (16) is fixedly connected with an abutting rod (25). A plurality of first elastic telescopic arms (19) are arranged on the opposite sides of the first mounting plate (11) and the fourth mounting plate (37). Each first elastic telescopic arm (19) is fixedly connected with an adjacent moving block (20).

4. The metal bar cutting machine according to claim 3, wherein On the left side of the first mounting plate (11), a number of first abutting wheels (18) are also provided. Each first abutting wheel (18) is rotatably connected to an adjacent first elastic telescopic arm (19). The abutting pipe (16) is slidably connected to the outer wall of all the sliding rods (12) with the fourth mounting plate (37). The abutting pipe (16) is connected to the first mounting plate (11) by a plurality of first springs (14). Each first spring (14) is sleeved on the outer wall of the sliding rod (12). The abutting pipe (16) is connected to the fourth mounting plate (37) by a plurality of second springs (15). Each second spring (15) is sleeved on the outer wall of the adjacent sliding rod (12).

5. A metal bar cutting machine according to claim 1, characterized in that, The rotating mechanism (301) includes a third mounting plate (23). The third mounting plate (23) is slidably sleeved on the outer wall of the sliding rod (12). The third mounting plate (23) is located between the fourth mounting plate (37) and the second mounting plate (13). The third mounting plate (23) is fixedly connected to the fourth mounting plate (37) by a second elastic telescopic arm (22).

6. The metal bar cutting machine according to claim 5, characterized in that, The left end of the inner wall of the second elastic telescopic arm (22) is fixedly connected to the protective cover (7) by a first pull rope (21). The outer wall of the first pull rope (21) also slidably passes through the inside of the fitting pipe (24), the abutting pipe (16) and the fourth mounting plate (37). On the right side of the fourth mounting plate (37), a plurality of second abutting wheels (27) are provided. Each second abutting wheel (27) is rotatably connected to an adjacent first elastic telescopic arm (19).

7. The metal bar cutting machine according to claim 6, wherein, The second abutting wheel (27) is fixedly connected to the first elastic telescopic arm (19) by a first return torsion spring. One end of the second abutting wheel (27) away from the fourth mounting plate (37) is fixedly connected to a first air pipe (28). A second pull rope (26) is wound around the outer wall of the first air pipe (28). The free end of the second pull rope (26) is fixedly connected to the third mounting plate (23).

8. A metal bar cutting machine according to claim 1, characterized in that, The moving mechanism (201) includes a fixing plate (39). The fixing plate (39) is fixedly connected to the upper end of the mounting base (10). The right end of the fixing plate (39) is fixedly connected to two second air pipes (38). A rectangular frame (40) is fixedly connected between the two second air pipes (38). A plurality of rotating plates (31) are rotatably connected inside the rectangular frame (40). A second return torsion spring is fixedly connected between the rotating plate (31) and the inner wall of the second abutting wheel (27). A third abutting wheel (29) is also rotatably connected inside the rotating plate (31). The right end of the third abutting wheel (29) is fixedly connected to a rotating block (34).

9. The metal bar cutting machine according to claim 8, wherein, A number of moving grooves (36) are formed inside the rotating block (34). A second tooth (33) with a reset function is slidably connected inside each moving groove (36). On the right side of the rotating block (34), there is an installation round box (30). The installation round box (30) is fixedly connected to the rectangular frame (40) by a connecting arm. The rotating block (34) is located inside the installation round box (30).

10. A metal bar cutting machine according to claim 9, characterized in that, The inner wall of the installation round box (30) is fixedly connected with a plurality of first teeth (32), the outer wall of the second teeth (33) is in mutual abutment with the inner wall of the installation round box (30), the rectangular frame (40) is fixedly connected with the second mounting plate (13) through a first air pipe (28), and the first air pipe (28) is fixedly communicated with two second air pipes (38) through a pipeline.

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