Laser pipe cutting machine with high safety coefficient

Abstract

A laser pipe cutting machine with a high safety coefficient comprises a protection device arranged on one side of a machine body of the pipe cutting machine and a plurality of supporting devices arranged on a pipe conveying path of the machine body of the pipe cutting machine, each supporting device comprises a support for supporting a reducing wheel and an air cylinder rotationally connected with the middle of the support, and the air cylinders and the supports are connected with the machine body through supports. The air cylinder and the bracket are rotationally connected with the support; the vertical projection of the hinge point of the support and the air cylinder is located between the vertical projections of the two supports. The protection device comprises an upper protection plate, a telescopic cylinder and a guide mechanism, the telescopic cylinder is arranged on one side of the upper protection plate and can drive the upper protection plate to vertically ascend and descend, the guide mechanism can guide the telescopic cylinder, the telescopic cylinder is vertically arranged on one side of the middle of the upper protection plate, the upper end of the telescopic cylinder is connected with the upper protection plate, and the lower end of the telescopic cylinder is connected with the lathe bed. A guide block is arranged on the guide rod in a sliding mode and connected with the lathe bed through a mounting base. The pipe cutting machine is uniform in stress, stable in movement, high in safety and convenient for operators to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment safety protection, in particular to a laser tube cutting machine with a high safety factor. Background Art

[0002] In actual operation, the core of the working principle of the laser tube cutting machine is to use the high energy of the laser beam to cut the tube. When processing longer tubes, in order to improve the processing accuracy, multiple sets of support mechanisms need to be set along the length direction of the tube cutting machine bed. However, the support mechanism in the existing technology still has defects. For example, a laser tube cutting machine cam wheel support mechanism with application number CN201921529154.4 includes two connecting seats connected to the tube cutting machine bed, a support frame supporting the cam wheel and a lifting cylinder supporting the support frame. The fixed ends of the support frame and the cylinder are hingedly connected to the two connecting seats respectively, and the two connecting seats are located on the same side. When in use, the lifting cylinder needs to work continuously to maintain the support state. Since the fixed ends of the support frame and the lifting cylinder are on the same side, when the piston rod of the lifting cylinder is retracted, the support frame almost remains parallel to the lifting cylinder. In this case, the vertical downward pressure of the support frame and the cam wheel on it is mainly borne by the lifting cylinder, so that the piston rod of the lifting cylinder is in a large stress state for a long time, which is not only not labor-saving but also prone to the risk of piston rod breakage. If the piston rod breaks when manually replacing a larger diameter pipe, it will seriously threaten the safety of the operator.

[0003] At the same time, when switching between pipes of different diameters, a person needs to manually reach out from the outside of the bed to adjust the position of the support mechanism and install the pipe. Therefore, sufficient space needs to be reserved outside the bed of the pipe cutting machine for the operator to perform these operations. In order to protect the safety of operators and pedestrians, a liftable protective cover is set on the side of the bed during the processing. For example, a protective device for a laser tube cutting machine and a laser tube cutting machine with application number CN202021807007.1 provide a liftable protective structure, which includes a protective plate arranged on the outside of the bed, and the protective plate is driven to move up and down by a cylinder vertically arranged on one side of the protective plate, and guide rails sliding with the protective plate are distributed along the moving direction of the protective plate. However, this structure has applicability problems in the cutting of longer pipes. The processing of longer pipes requires a longer bed length to be covered. If multiple protective devices are designed along the bed, the height of the guide rail will hinder the operator's operation; and if a longer protective plate is used for shielding, since the cylinder is vertically arranged on one side of the protective plate, there is a risk of uneven force. The use of a longer protective plate is more likely to cause uneven force, which may cause jamming or even damage to the protective device, affecting normal protection work, and its safety is relatively low. Utility Model Content

[0004] In order to solve the technical problems existing in the above background technology, the utility model provides a laser tube cutting machine with a high safety factor.

[0005] The technical solution of this utility model is as follows:

[0006] A high-safety laser tube cutting machine includes a protective device mounted on one side of the machine bed and several support devices positioned along the tube conveying path within the machine bed. The support devices include a bracket supporting a variable diameter wheel and a cylinder rotatably connected to the center of the bracket. The cylinder and bracket are both connected to the machine bed via a support, and both the cylinder and bracket are rotatably connected to the support. During use, the bracket is driven by the cylinder, rotating around its support. The variable diameter wheel on the bracket moves up and down relative to the machine bed, thereby adjusting the height of the variable diameter wheel body and supporting a variety of tubes of different diameters.

[0007] As the core technical concept of the present invention, the vertical projection of the hinge point between the bracket and the cylinder is located between the vertical projections of the two supports. Through this design, when external force acts on the variable diameter wheel, this force will not be concentrated on the cylinder, but will be transmitted to three different positions through the bracket, thereby increasing the number of force points. Compared with the traditional method of placing the supports on the same side, the three fulcrums can distribute the load more evenly, reducing excessive reliance on the cylinder. Each position bears part of the force, thereby realizing force dispersion. It utilizes the stability of the triangle and the principle of mechanical balance to achieve a more balanced force distribution, increase the service life of the cylinder, and thus improve the operating efficiency and safety of the equipment.

[0008] As another core technical concept of the present invention, the supporting device includes an upper guard plate and a telescopic cylinder on one side of the upper guard plate that can drive the upper guard plate to lift vertically, as well as a guide mechanism that can provide a guiding effect for the lifting of the upper guard plate. The telescopic cylinder is vertically arranged on one side of the middle of the upper guard plate, and the upper end is connected to the upper guard plate, and the lower end is connected to the bed. The guide mechanism includes guide rods vertically arranged on both sides of the upper guard plate (on both sides of the upper guard plate on the pipe conveying path of the pipe cutting machine bed). A guide block is slidingly provided on the guide rod, and the guide block is connected to the bed through a mounting seat. When in use, the upper guard plate is moved by the telescopic bar on one side of the middle thereof. It is driven to rise and is guided by the guide rods and guide blocks located on both sides of the upper guard plate, thereby driving the upper guard plate to rise smoothly for safety protection. The upper guard plate of this structure is evenly stressed, which reduces jamming and improves the smoothness of the upper guard plate's lifting movement. It has higher safety. During the lifting process of the upper guard plate, the guide block is fixed on the mounting seat, and the guide rod slides upward along the guide block, so that under the travel conditions required by the upper guard plate, the height of the mounting seat is lowered, and it does not need to exceed the working plane too much, thereby facilitating the operator to debug the pipe cutting machine equipment and other operations.

[0009] As a further implementation method: the support connected to the cylinder is the first support, one side of the first support is connected to the cylinder, and the other side is plug-connected to the pipe cutting machine bed. Since the first support is located inside the pipe cutting machine bed and is inconvenient to disassemble and assemble, the cylinder is plug-connected to the pipe cutting machine bed through the first support, which can realize quick disassembly and assembly of the cylinder.

[0010] Specifically, the supporting device also includes a fixed block connected to the pipe cutting machine bed. A number of sockets are opened in the middle of the fixed block. The first support is provided with insertion strips corresponding to the sockets, and is plugged into the fixed block through the insertion strips. During use, for long-term processing of pipes with larger or smaller diameters, it is necessary to replace cylinders of different specifications. In this case, the cylinder and the first support can be directly removed from the fixed block. After replacing the cylinder, the first support can be plugged and hung on the fixed block. There is no need to repeatedly disassemble and assemble a large number of bolts of the first support, which makes the operation very convenient and improves work efficiency.

[0011] In order to further improve the overall stability and safety of this protection mechanism: the guide rod is connected to the inner plate surface of the upper guard plate, and its length is not less than 90% of the vertical height of the upper guard plate, which increases the connection area between the guide rod and the upper guard plate, thereby increasing the strength of the upper guard plate. This design makes the connection between the lower guard plate and the pipe cutting machine body more stable, thereby improving the overall safety.

[0012] Preferably, the mounting seat includes a vertically arranged U-shaped long plate, and connecting plates are vertically provided on both sides of its opening. The lower end of the connecting plate is connected to the bed, and the guide block is connected to the upper end of the long plate. By optimizing the structural design of the mounting seat, the overall height of the long plate is reduced while maintaining sufficient connection area between the long plate and the upper guard plate and between the guide block and the pipe cutting machine bed, without exceeding the working plane too much, thereby facilitating the operator to debug the pipe cutting machine equipment and other operations.

[0013] Furthermore, it also includes a lower guard plate vertically arranged on one side of the upper guard plate, one side of which is provided with a support base connected to the bed. When the upper guard plate rises to the outside above the working plane of the pipe cutting machine bed, the outer side of the pipe cutting machine bed can be protected by the lower guard plate, thereby providing more comprehensive protection for operators and pedestrians, further improving safety.

[0014] As described above, a laser tube cutting machine with a high safety factor, the support base includes a cross bar arranged on the lower side of the upper guard plate, and the upper guard plate is configured to be able to descend to abut against the cross bar, so as to support the upper guard plate in special circumstances, such as when the telescopic cylinder fails, to prevent damage to other components.

[0015] One end of the above-mentioned cross bar is vertically provided with a vertical rod connected to the inner plate surface of the lower guard plate. The length of the vertical rod is not less than 85% of the vertical height of the lower guard plate to increase the connection area between the vertical rod and the lower guard plate, thereby increasing the strength of the lower guard plate. This design makes the connection between the lower guard plate and the pipe cutting machine body more stable, thereby improving the overall safety.

[0016] To ensure that the upper guard plate has sufficient movement stroke while not affecting the operator's debugging and other operations on the pipe cutting machine equipment: the horizontal height difference between the upper end of the mounting base and the working plane of the pipe cutting machine does not exceed 25cm. According to ergonomics, the lowest working plane height that usually requires greater force is 75cm, and the maximum height for adults to work manually is 100cm. Therefore, the upper end of the mounting base is designed to be low enough so that the maximum height difference between it and the working plane of the pipe cutting machine body is kept within 25cm. This design not only meets the operator's work comfort, but also avoids interference with manual debugging and other work.

[0017] Furthermore, the maximum height of the horizontal plane where the upper end of the upper guard plate is located is not less than the maximum height of the horizontal plane where the reducing wheel is located, so as to ensure that the upper guard plate can effectively achieve the protective function, and the minimum height dimension of the horizontal plane where the upper end of the upper guard plate is located does not exceed 25 cm of the height dimension of the working plane of the pipe cutting machine.

[0018] The beneficial effects of the present invention are:

[0019] This laser tube cutting machine achieves a more balanced force distribution by placing the vertical projection of the hinge point between the bracket and the cylinder between the vertical projections of the two supports. This design not only enhances the stability and load-bearing capacity of the entire tube cutting machine, but also improves the operating efficiency and safety of the equipment.

[0020] The telescopic cylinder of this laser tube cutting machine is vertically arranged on one side of the middle part of the upper guard plate, and the guide rods of the guide mechanism are vertically arranged on both sides of the upper guard plate. This design makes the upper guard plate evenly stressed and can rise smoothly, reducing jamming and improving the stability of the upper guard plate's lifting movement, which is safer.

[0021] The guide block of this laser tube cutting machine is fixed on the mounting base, and the guide rod slides along the guide block, so that the minimum height of the overall protective structure is reduced while meeting the stroke required by the upper guard plate. It does not need to exceed the working plane too much, thereby facilitating the operator to perform operations such as debugging the tube cutting machine equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached figure:

[0023] Figure 1 This is a schematic structural diagram of a laser tube cutting machine with a high safety factor according to the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the protective device;

[0025] Figure 3 for Figure 2 lateral schematic diagram of ;

[0026] Figure 4 for Figure 1 Top view of the middle protective device (partial);

[0027] Figure 5 for Figure 1 a top view of the middle support device;

[0028] Figure 6 for Figure 5 Schematic diagram of the connection structure between the first support and the fixed block (front view);

[0029] Figure 7 for Figure 5 Schematic diagram of the connection structure between the third support and the connector (side view);

[0030] Figure 8 for Figure 5 AA cross-section diagram in;

[0031] The components represented by the reference numerals in the figure are:

[0032] 1. Protective device; 11. Upper guard plate; 12. Telescopic cylinder; 13. Guide rod; 14. Guide block; 15. Mounting seat; 151. Long board; 152. Connecting plate; 16. Lower guard plate; 17. Support seat; 171. Cross bar; 172. Vertical bar; 2. Support device; 21. First support; 211. Insert; 22. Second support; 23. Fixed block; 24. Third support; 241. Fixed plate; 242. Connecting block; 25. Connector; 251. Connecting shaft. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, this embodiment provides a laser tube cutting machine with a high safety factor, including a protective device 1 arranged on one side of the tube cutting machine bed, and a plurality of supporting devices 2 arranged on the tube conveying path of the tube cutting machine bed, the supporting device 2 includes a bracket supporting the variable diameter wheel and a cylinder rotatably connected to the middle part of the bracket, the cylinder and the bracket are both connected to the bed through a support, and the cylinder and the bracket are both rotatably connected to the support where they are located.

[0034] During use, the bracket is driven by the cylinder and rotates around the support on which it is located. At this time, the reducing wheel on the bracket moves up and down relative to the pipe cutting machine body, thereby adjusting the height of the reducing wheel body and supporting a variety of pipes with different diameters.

[0035] For the supporting device 2, specifically combined with Figure 5-Figure 8For example, the vertical projection of the hinge point between the bracket and the cylinder is located between the vertical projections of the two supports. When external force acts on the variable diameter wheel, the force will not be concentrated on the cylinder, but will be transmitted to three different positions through the bracket, thereby increasing the number of force points. Compared with the traditional method of placing all the supports on the same side, the three fulcrums can distribute the load more evenly, reducing excessive reliance on the cylinder. Each position bears part of the force, thereby achieving force dispersion. It utilizes the stability of the triangle and the principle of mechanical balance to achieve a more balanced force distribution, increase the service life of the cylinder, and thus improve the operating efficiency and safety of the equipment.

[0036] Specifically, combined Figure 5 and Figure 6 For example, the support connected to the cylinder among the two supports is the first support 21, and the support connected to the bracket is the second support 22, and the bracket is detachably connected to the bed through the second support 22, wherein one side of the first support 21 is connected to the cylinder, and the other side is connected to the pipe cutting machine bed through a fixed block 23. Since the first support 21 is located inside the pipe cutting machine bed, it is inconvenient to disassemble and assemble the first support 21. The cylinder is connected to the pipe cutting machine bed through the first support 21, which can realize quick disassembly and assembly of the cylinder.

[0037] One side of the fixed block 23 is connected to the pipe cutting machine body, and a number of sockets are opened in the middle of the other side. One side of the first support 21 is rotatably connected to the cylinder, and the corresponding socket on the other side is provided with an insertion strip 211, and is plugged into the fixed block 23 through the insertion strip 211. During use, for long-term processing of pipes with larger or smaller diameters, it is necessary to replace cylinders of different specifications. In this case, the cylinder and the first support 21 can be directly removed from the fixed block 23. After replacing the cylinder, the first support 21 can be plugged and hung on the fixed block 23. There is no need to repeatedly disassemble and assemble a large number of bolts of the first support 21, which makes operation very convenient and improves work efficiency.

[0038] In this embodiment, in order to further improve the convenience of disassembly and assembly of the cylinder, the support device 2 also includes a third support 24 provided in the middle of the bracket. The piston rod at the output end of the cylinder is plug-connected to the middle of the bracket through the third support 24. Although the connection position between the bracket and the cylinder can be extended by driving the cylinder piston rod to expose this part from the bed, sometimes when the cylinder fails or other situations occur, this part may also be located inside the bed. Therefore, the plug-in connection method can improve the efficiency and convenience of disassembly and assembly between the cylinder and the bracket.

[0039] Combine Figure 7 and Figure 8Specifically, a connecting head 25 is provided at the output end of the cylinder, and the third support 24 includes a fixing plate 241 connected to the bracket on one side, and a connecting block 242 is vertically provided on the other side of the fixing plate 241, and a socket is provided inside the connecting block 242. The piston rod of the cylinder is threadedly connected to the connecting head 25, and a connecting shaft 251 that is plugged into the socket is vertically provided on one side of the connecting head 25, and a boss is also provided at one end of the connecting shaft 251 close to the piston rod. The connecting shaft 251 is abutted against one side of the connecting block 242 through the boss thereon, and the other end extends out of the socket to the other side of the connecting block 242 and is provided with an anti-slip limit piece. A circular gasket is also sleeved on the connecting shaft 251 between the connecting head 25 and the anti-slip limit piece, wherein the anti-slip limit piece is a cotter pin. When in use, the cotter pin is inserted into the position where the connecting shaft 251 extends out of the connecting block 242 along the diameter direction of the connecting shaft 251 to complete the limiting of the connecting shaft 251.

[0040] Furthermore, the connecting block 242 is provided in the middle of the fixing plate 241, and the bracket is detachably connected to the four corner positions of the fixing plate 241 by bolts. Its design increases the contact area between the fixing plate 241 and the bracket, ensuring the firmness and reliability of the connection.

[0041] For the protective device 1, specifically combined with Figure 2-Figure 4 For example, the protective device 1 includes an upper guard plate 11 and a telescopic cylinder 12 on one side of the upper guard plate 11 that can drive its vertical lifting, as well as a guide mechanism that can provide a guiding effect for its lifting. The telescopic cylinder 12 is vertically arranged on one side of the middle part of the upper guard plate 11, and the upper end is connected to the upper guard plate 11, and the lower end is connected to the bed. The guide mechanism includes guide rods 13 vertically arranged on both sides of the upper guard plate 11, that is, the guide rods 13 are arranged on both sides of the telescopic cylinder 12, and a guide block 14 is slidably provided on the guide rods 13, and the guide block 14 is connected to the bed through a mounting seat 15. The lower end of the mounting seat 15 is connected to the bed, and the guide block 14 is connected to the upper end of the mounting seat 15.

[0042] It should be noted that the protective devices 1 here can be arranged in several groups transversely along the length direction of the upper guard plate 11 according to the length of the pipe cutting machine body that needs to be protected.

[0043] When in use, the upper guard plate 11 is driven up by the telescopic rod provided on one side of its middle part, and is guided by the guide rod 13 and the guide block 14 located on both sides of the upper guard plate 11, thereby driving the upper guard plate 11 to rise smoothly for safety protection. The upper guard plate 11 of this structure is subjected to uniform force, which reduces jamming and improves the smoothness of the lifting and lowering movement of the upper guard plate 11, and its safety is relatively high. During the lifting and lowering process of the upper guard plate 11, the guide block 14 is fixed on the mounting seat 15, and the guide rod 13 slides upward along the guide block 14, so that under the travel conditions required by the upper guard plate 11, the height of the mounting seat 15 is lowered, and it does not need to exceed the working plane too much, thereby facilitating the operator to debug the pipe cutting machine equipment and other operations.

[0044] A plurality of transparent observation windows are also provided in the middle of the upper guard plate 11 to facilitate the operator to observe it during the safety protection process.

[0045] Combine Figure 2 The guide rod 13 is connected to the inner plate surface of the upper guard plate 11, and its length is not less than 90% of the vertical height of the upper guard plate 11, which increases the connection area between the guide rod 13 and the upper guard plate 11, thereby increasing the strength of the upper guard plate 11. This design makes the connection between the lower guard plate 16 and the pipe cutting machine body more stable, thereby improving the overall safety.

[0046] Combine Figure 2 and Figure 4 The mounting seat 15 includes a vertically arranged U-shaped long plate 151, and connecting plates 152 are vertically provided on both sides of its opening. The lower end of the connecting plate 152 is connected to the bed, and the guide block 14 is connected to the upper end of the long plate 151. By optimizing the structural design of the mounting seat 15, the overall height of the long plate 151 is reduced while maintaining sufficient connection area between the long plate 151 and the upper guard plate 11 and between the guide block 14 and the pipe cutting machine bed, without exceeding the working plane too much, thereby facilitating the operator to debug the pipe cutting machine equipment.

[0047] Combine Figure 3 , and also includes a lower guard plate 16 vertically arranged on one side of the upper guard plate 11, one side of which is provided with a support seat 17 connected to the bed, and a number of support seats 17 are arranged at horizontal gaps along the length direction of the upper guard plate 11. When the upper guard plate 11 rises to the outside above the working plane of the pipe cutting machine bed, the outer side of the pipe cutting machine bed can be protected by the lower guard plate 16, thereby providing more comprehensive protection for operators and pedestrians, further improving safety.

[0048] Specifically, the support seat 17 includes a cross bar 171 provided on the lower side of the upper guard plate 11. The upper guard plate 11 is configured to be able to descend to abut against several cross bars 171 to support the upper guard plate 11 in special circumstances, such as when the telescopic cylinder 12 fails, to prevent damage to other components. One end of the cross bar 171 is vertically provided with a vertical bar 172 connected to the inner plate surface of the lower guard plate 16. The length of the vertical bar 172 is not less than 85% of the vertical height of the lower guard plate 16 to increase the connection area between the vertical bar 172 and the lower guard plate 16, thereby increasing the strength of the lower guard plate 16. This design makes the connection between the lower guard plate 16 and the pipe cutting machine bed more stable, thereby increasing the overall safety.

[0049] In order to ensure that the upper guard plate 11 has sufficient movement stroke while not affecting the operator's debugging and other operations of the pipe cutting machine equipment: the horizontal height difference between the upper end of the mounting seat 15 and the working plane of the pipe cutting machine does not exceed 25 cm. According to ergonomics, the lowest working plane height that usually requires greater force is 75 cm, and the highest height for adults to work manually is 100 cm. Therefore, the upper end of the mounting seat 15 is designed to be low enough so that the maximum height difference between it and the working plane of the pipe cutting machine body is kept within 25 cm. This design not only meets the operator's work comfort, but also avoids interference with manual debugging and other work.

[0050] At the same time, the maximum height of the horizontal plane where the upper end of the upper guard plate 11 is located is not less than the maximum height of the horizontal plane where the reducing wheel is located, so as to ensure that the upper guard plate 11 can effectively achieve the protective function, and the minimum height dimension of the horizontal plane where the upper end of the upper guard plate 11 is located does not exceed 25 cm of the height dimension of the working plane of the pipe cutting machine.

Claims

1. A laser tube cutting machine with a high safety factor, comprising a protective device (1) provided on one side of a tube cutting machine bed, and a plurality of supporting devices (2) provided on a tube material conveying path of the tube cutting machine bed, wherein the supporting device (2) comprises a bracket supporting a diameter-changing wheel and a cylinder rotatably connected to the middle of the bracket, wherein the cylinder and the bracket are both connected to the bed through a support, and the cylinder and the bracket are both rotatably connected to the support on which they are located, and wherein the invention is characterized in that: The vertical projection of the hinge point between the bracket and the cylinder is located between the vertical projections of the two supports; The protective device (1) comprises an upper guard plate (11) and a telescopic cylinder (12) on one side thereof capable of driving the upper guard plate to vertically lift the upper guard plate, and a guide mechanism capable of providing a guiding function for the upper guard plate to lift the upper guard plate; The telescopic cylinder (12) is vertically arranged on one side of the middle of the upper guard plate (11), and the upper end is connected to the upper guard plate (11), and the lower end is connected to the bed. The guide mechanism includes a guide rod (13) vertically arranged on both sides of the upper guard plate (11) in the horizontal direction, and a guide block (14) is slidably provided on the guide rod. The guide block (14) is connected to the bed through a mounting seat (15).

2. A laser tube cutting machine with a high safety factor as claimed in claim 1, characterized in that: The support connected to the cylinder is a first support (21), one side of which is connected to the cylinder and the other side of which is plug-connected to the bed.

3. A laser tube cutting machine with a high safety factor as claimed in claim 2, characterized in that: The supporting device (2) further comprises a fixing block (23) connected to the bed; A plurality of insertion holes are provided in the middle of the fixing block (23), and the first support (21) is provided with insertion strips (211) corresponding to the insertion holes, and is plug-connected to the fixing block (23) via the insertion strips (211).

4. A laser tube cutting machine with a high safety factor as claimed in claim 1, characterized in that: The guide rod (13) is connected to the inner plate surface of the upper guard plate (11), and its length is not less than 90% of the vertical height of the upper guard plate (11).

5. The laser tube cutting machine with high safety factor as claimed in claim 1, characterized in that: The mounting seat (15) comprises a vertically arranged U-shaped long plate (151), with connecting plates (152) vertically provided on both sides of the opening, the lower end of the connecting plate (152) being connected to the bed, and the guide block (14) being connected to the upper end of the long plate (151).

6. A laser tube cutting machine with a high safety factor according to any one of claims 1 to 5, characterized in that: It also includes a lower guard plate (16) vertically arranged on one side of the upper guard plate (11), and a support base (17) connected to the bed is provided on one side of the lower guard plate.

7. A laser tube cutting machine with a high safety factor as claimed in claim 6, characterized in that: The support seat (17) comprises a crossbar (171) provided on the lower side of the upper guard plate (11), and the upper guard plate (11) is configured to be able to descend to abut against the crossbar (171).

8. A laser tube cutting machine with a high safety factor as claimed in claim 7, characterized in that: A vertical rod (172) connected to the inner surface of the lower guard plate (16) is vertically provided at one end of the crossbar (171), and the length of the vertical rod (172) is not less than 85% of the vertical height of the lower guard plate (16).

9. The laser tube cutting machine with high safety factor as claimed in claim 1, characterized in that: The height difference between the upper end of the mounting seat (15) and the working plane of the pipe cutting machine does not exceed 25 cm.

10. The laser tube cutting machine with high safety factor according to claim 9, characterized in that: The maximum height of the horizontal plane where the upper end of the upper guard plate (11) is located is not less than the maximum height of the horizontal plane where the diameter-changing wheel is located, and the minimum height dimension of the horizontal plane where the upper end of the upper guard plate (11) is located does not exceed 25 cm of the height dimension of the working plane of the pipe cutting machine.

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