Steel pipe cutting device and method for building decoration

Abstract

The invention discloses a steel pipe cutting device and method for building decoration, and relates to the technical field of steel pipe cutting. The steel pipe cutting device comprises a base, a shell is fixedly mounted at the top of the base, supporting legs are fixedly mounted at the bottom of the base, a discharging opening is formed in the surface of the shell, and a cutting groove is formed in the surface of the base; the L-shaped plate is slidably mounted on the inner wall of the shell, a driving device is arranged in the L-shaped plate, a square groove is formed in the surface of the L-shaped plate, the fixed seat is fixedly mounted at the top of the L-shaped plate, the fixed arc plate is rotatably mounted at the top of the fixed seat, and the two arc rods are fixedly mounted at the two ends of the fixed arc plate. A triangular block is fixedly installed on the surface of an arc-shaped rod, a steel pipe can be fixed through a fixing arc plate, the situation that the position of the steel pipe deviates when the steel pipe is cut, and a cutting tool possibly bears irregular counter-acting force is prevented, and the precision during cutting is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe cutting, and in particular to a steel pipe cutting device and method for building decoration. Background Art

[0002] Steel pipe cutting devices for building decoration are usually used to cut steel pipes quickly and accurately to facilitate decoration construction, pipeline installation or other construction projects.

[0003] The patent with patent announcement number CN208289116U involves a steel pipe fixed-length cutting device, including a transmission device, a cutting device, and a fixed-length device. The cutting device includes a pressure block and a cutting saw blade. The pressure block is controlled to rise and fall by a cylinder. The fixed-length device includes a stopper and a ruler. The ruler is set on a horizontal fixed bracket. The stopper is adjusted to rise and fall by a second lifting screw. This patent can realize fixed-length cutting, transmission, and unloading of steel pipes, and the length of the steel pipe can be adjusted according to demand.

[0004] In the above patent, the fixed-length device includes a block and a ruler. The ruler is set on a horizontal fixed bracket. The block is adjusted to rise and fall by a second lifting screw. This patent can realize fixed-length cutting, transmission, and unloading of steel pipes, and the length of the steel pipe can be adjusted according to needs. However, the position of the steel pipe needs to be fixed before cutting. If the steel pipe is not fixed, it will cause the steel pipe to move during the cutting process, thereby affecting the cutting path and causing the cutting line to be non-straight or irregular. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a steel pipe cutting device and method for building decoration, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a steel pipe cutting device for building decoration, comprising a base, a shell is fixedly installed on the top of the base, a supporting leg is fixedly installed on the bottom of the base, a discharge port is opened on the surface of the shell, a cutting groove is opened on the surface of the base, a fixing device is arranged on the top of the base, a protective device is arranged inside the shell, and a grinding device is arranged on the bottom of the base; Wherein, the fixing device comprises: an L-shaped plate, a fixing seat, a fixed arc plate, two arc rods, a triangular block, a sliding plate, a pulling rod, a U-shaped rod and a sliding long rod, the L-shaped plate is slidably installed on the inner wall of the shell, a driving device is arranged inside the L-shaped plate, a square groove is opened on the surface of the L-shaped plate, the fixing seat is fixedly installed on the top of the L-shaped plate, the fixed arc plate is rotatably installed on the top of the fixing seat, two arc rods are fixedly installed on both ends of the fixed arc plate, the triangular block is fixedly installed on the surface of the arc rod, the sliding plate is slidably installed on the bottom of the L-shaped plate, the pulling rod is fixedly installed on the surface of the sliding plate, the U-shaped rod is rotatably installed on the inner wall of the shell, the sliding long rod slides through the inner and outer walls of the shell, and the movement of the sliding plate will drive the triangular block to move in the direction away from the square groove. After the movement, the triangular block no longer contacts the square groove, so that the fixation of the fixed arc plate to the steel pipe can be released, and then the steel pipe leaves the inside of the shell through the discharge port.

[0007] According to the above technical solution, a No. 1 torsion spring is arranged between the fixed arc plate and the fixed seat, the U-shaped rod is in contact with the triangular block, and the No. 1 torsion spring drives the fixed arc plate to reset.

[0008] According to the above technical solution, a No. 2 torsion spring is arranged between the U-shaped rod and the shell, and the sliding long rod is in contact with the U-shaped rod, and the No. 2 torsion spring drives the U-shaped rod to reset.

[0009] According to the above technical solution, the protective device includes: an elastic telescopic rod, a transmission rod, a support frame and a square plate, the elastic telescopic rod is fixedly installed on the top of the base, the support frame is fixedly installed on the top of the base, the square plate is fixedly installed on the top of the elastic telescopic rod, and the transmission rod is fixedly installed on a side of the square plate close to the L-shaped plate. As the steel pipe moves toward the discharge port, the steel pipe will contact the support frame, and the steel pipe will be blocked by the support frame when moving, so that the steel pipe will fit tightly with the fixed arc plate when moving.

[0010] According to the above technical solution, the protective device also includes: an air cylinder, a piston, a support column and three air outlet holes. The air cylinder is fixedly installed on the top of the base, the piston is slidably installed on the inner wall of the air cylinder, one end of the support column is fixedly installed on the top of the piston, and the other end of the support column is fixedly installed on the bottom of the square plate. The three air outlet holes are all opened on the surface of the air cylinder. The movement of the support column toward the bottom will drive the piston to move toward the bottom, and the movement of the piston toward the bottom will squeeze the air inside the air cylinder and spray it out through the air outlet holes.

[0011] According to the above technical solution, a No. 1 spring is arranged between the piston and the inflation cylinder, the sliding plate is in contact with the transmission rod, and the piston is reset by the No. 1 spring.

[0012] According to the above technical scheme, the grinding device includes: a hollow shell, a cutting machine, a rotating rod, a rotating shaft, a rotating long rod, a grinding machine, a round rod, a transmission oblique rod and a vertical plate. The hollow shell is slidably installed on the inner wall of the cutting groove, the cutting machine is fixedly installed between the hollow shells, the vertical plate is fixedly installed on the top of the base, the rotating rod rotatably passes through the inner and outer walls of the vertical plate, one end of the rotating rod is rotatably installed on the surface of the square plate, the other end of the rotating rod is rotatably installed on the top of the hollow shell, the rotating shaft is rotatably installed on the bottom of the base, the rotating long rod is fixedly installed on the circumferential surface of the rotating shaft, the grinding machine is fixedly installed on the circumferential surface of the rotating shaft, the round rod is fixedly installed on the surface of the hollow shell, and the transmission oblique rod is fixedly installed on the surface of the rotating long rod. The rotation of the transmission oblique rod will drive the rotating long rod to rotate, the rotation of the rotating long rod will drive the rotating shaft to rotate, the rotation of the rotating shaft will drive the grinder to rotate, and the rotation of the grinder will contact the blade of the cutting machine.

[0013] According to the above technical solution, the round rod is in contact with the transmission inclined rod, and a No. 3 torsion spring is arranged between the rotating shaft and the base, and the rotating shaft is driven to reset by the No. 3 torsion spring.

[0014] The present invention provides a steel pipe cutting device and method for building decoration, which has the following beneficial effects: (1) The invention makes the fixed arc plate unable to rotate after the triangular block cannot rotate. The fixed arc plate will fix the steel pipe to prevent the steel pipe from shifting during cutting and prevent the cutting tool from being subjected to irregular reaction force, resulting in uneven cutting force, thereby improving the precision of cutting. After the triangular block moves, it will no longer contact the square groove, so that the fixation of the steel pipe by the fixed arc plate can be released. The fixation of the steel pipe can be quickly released, saving time when the steel pipe is disassembled and improving work efficiency. After the triangular block moves, it will no longer contact the square groove, so that the fixation of the fixed arc plate on the steel pipe can be released. The fixation of the steel pipe can be quickly released, saving time when the steel pipe is disassembled and improving work efficiency.

[0015] (2) The invention blocks the steel pipe from moving by the support frame so that the steel pipe will fit closely with the fixed arc plate when moving, thereby preventing the steel pipe from rotating during cutting, which would result in poor cutting accuracy and the need for re-cutting. This reduces time and material waste. The piston moves toward the bottom, squeezing the air inside the inflation cylinder to be ejected through the air outlet. Sparks generated during cutting will flow to the bottom due to the circulation of air, thereby reducing damage to the device inside the shell caused by the sparks, improving the protection effect on the device, and extending the service life of the device.

[0016] (3) The invention, when the piston moves toward the bottom, squeezes the air inside the inflator and ejects it through the air outlet, so that the sparks generated during cutting are affected by the air flow to the bottom, reducing the damage caused by the sparks to the device inside the shell, improving the protection effect of the device, and extending the service life of the device. The grinding machine rotates and contacts the blade of the cutting machine, so that after the cutting machine completes the cutting, the remaining inertia of the blade after the rotation of the blade contacts the grinding machine and grinds the blade, so that the blade is grinded after each cutting is completed, ensuring the sharpness of the blade and the accuracy of the cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the housing of the present invention; Figure 3 It is a schematic diagram of the structure of the fixing device of the present invention; Figure 4 This is a schematic diagram of the bottom structure of the L-shaped plate of the present invention; Figure 5 This is a schematic diagram of the position relationship structure of the U-shaped rod of the present invention; Figure 6 It is a schematic diagram of the structure of the protective device of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the inflator of the present invention; Figure 8 It is a schematic diagram of the structure of the grinding device of the present invention; Fig. 9 It is a schematic structural diagram of the positional relationship between the grinder and the rotating shaft of the present invention.

[0018] In the figure: 1. base; 2. shell; 31. L-shaped plate; 32. fixed seat; 33. fixed arc plate; 34. arc rod; 35. triangular block; 36. sliding plate; 37. pull rod; 38. U-shaped rod; 39. sliding long rod; 41. elastic telescopic rod; 42. transmission rod; 43. support frame; 44. square plate; 45. inflator; 46. piston; 47. support column; 48. spring No. 1; 49. air outlet; 51. hollow shell; 52. cutting machine; 53. rotating rod; 54. rotating shaft; 55. rotating long rod; 56. grinder; 57. round rod; 58. transmission diagonal rod; 59. vertical plate; 6. support leg; 7. discharge port. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 5 One embodiment of the present invention is: a steel pipe cutting device for building decoration, comprising a base 1, a shell 2 is fixedly installed on the top of the base 1, a supporting leg 6 is fixedly installed on the bottom of the base 1, a discharge port 7 is opened on the surface of the shell 2, a cutting groove is opened on the surface of the base 1, and a fixing device is arranged on the top of the base 1, and the fixing device comprises: an L-shaped plate 31, a fixing seat 32, a fixed arc plate 33, two arc rods 34, a triangular block 35, a sliding plate 36, a pull rod 37, a U-shaped rod 38 and a sliding long rod 39, the L-shaped plate 31 is slidably installed on the inner wall of the shell 2, a driving device is arranged inside the L-shaped plate 31, a square groove is opened on the surface of the L-shaped plate 31, the fixing seat 32 is fixedly installed on the top of the L-shaped plate 31, the fixed arc plate 33 is rotatably installed on the top of the fixing seat 32, and the two arc rods 34 are fixed on the top of the fixing seat 32. The arc rods 34 are fixedly mounted on both ends of the fixed arc plate 33, and the triangular blocks 35 are fixedly mounted on the surface of the arc rods 34 to prevent the steel pipe from shifting in position during cutting and to prevent the cutting tool from being subjected to irregular reaction forces, resulting in uneven cutting force, thereby improving the precision during cutting. The sliding plate 36 is slidably mounted on the bottom of the L-shaped plate 31, and the pull rod 37 is fixedly mounted on the surface of the sliding plate 36, so that the fixation of the steel pipe by the fixed arc plate 33 can be released, and the fixation of the steel pipe can be quickly released, saving time when the steel pipe is disassembled and improving work efficiency. The U-shaped rod 38 is rotatably mounted on the inner wall of the outer shell 2, and the sliding long rod 39 slides through the inner and outer walls of the outer shell 2, so that the steel pipe that has been cut can be automatically released after the cutting is completed, thereby improving the overall automation level of the device.

[0021] A first torsion spring is arranged between the fixed arc plate 33 and the fixed seat 32 , and the U-shaped rod 38 is in contact with the triangular block 35 , and the fixed arc plate 33 is driven to reset by the first torsion spring.

[0022] A second torsion spring is provided between the U-shaped rod 38 and the housing 2, and the sliding long rod 39 contacts the U-shaped rod 38, and the U-shaped rod 38 is driven to reset by the second torsion spring.

[0023] A method for using a steel pipe cutting device for building decoration comprises the following steps: Step 1: Place the steel pipe on top of the L-shaped plate 31, and then manually rotate the fixed arc plate 33, so that the rotation of the fixed arc plate 33 drives the arc rod 34 to rotate; Step 2: The arc rod 34 rotates to drive the triangular block 35 to rotate toward the bottom, and the triangular block 35 rotates to pass through the square slot. Then, due to its own appearance design, the triangular block 35 cannot rotate toward the top. After the triangular block 35 cannot rotate, the fixed arc plate 33 cannot rotate; Step 3: The fixed arc plate 33 will fix the steel pipe to prevent the position of the steel pipe from shifting during cutting, prevent the cutting tool from being subjected to irregular reaction force, resulting in uneven cutting force, and improve the precision of cutting.

[0024] When the present embodiment is working, the steel pipe is placed on the top of the L-shaped plate 31, and then the fixed arc plate 33 is manually rotated. The rotation of the fixed arc plate 33 drives the arc rod 34 to rotate. The rotation of the arc rod 34 drives the triangular block 35 to rotate toward the bottom, and the rotation of the triangular block 35 will pass through the square groove. Then, due to its own appearance design, the triangular block 35 cannot rotate toward the top. After the triangular block 35 cannot rotate, the fixed arc plate 33 cannot rotate. The fixed arc plate 33 will fix the steel pipe to prevent the position of the steel pipe from shifting during cutting, and prevent the cutting tool from being subjected to irregular reaction force, resulting in uneven cutting force, thereby improving the precision during cutting. The pull rod 37 is manually pulled, and the movement of the pull rod 37 will drive the sliding plate 36 to move toward the direction of the triangular block 35. The movement of the sliding plate 36 will drive the triangular block 35 to move away from the square groove. After the triangular block 35 moves, it no longer contacts the square groove, so that the fixation of the steel pipe by the fixed arc plate 33 can be released, and it can be quickly The steel pipe can be quickly released from the fixation, which saves time when the steel pipe is disassembled and improves work efficiency. The driving device drives the L-shaped plate 31 to move in the direction of the discharge port 7. The movement of the L-shaped plate 31 drives the fixing seat 32 to move in the direction of the discharge port 7. The movement of the fixing seat 32 drives the fixed arc plate 33 to move in the direction of the discharge port 7. The movement of the fixed arc plate 33 drives the steel pipe to move in the direction of the discharge port 7. The movement of the L-shaped plate 31 will drive the sliding plate 36 to move in the direction of the discharge port 7. The movement of the sliding plate 36 will contact the U-shaped rod 38. The U-shaped rod 38 will push the sliding plate 36 to move in the direction of the triangular block 35. The movement of the sliding plate 36 will drive the triangular block 35 to move in the direction away from the square groove. After the triangular block 35 moves, it no longer contacts the square groove, so that the fixation of the steel pipe by the fixed arc plate 33 can be released. Subsequently, the steel pipe leaves the interior of the shell 2 through the discharge port 7, so that the cut steel pipe can be automatically released after the cutting is completed, thereby improving the overall automation of the device.

[0025] See also Figure 1-Figure 9On the basis of the above embodiment, in another embodiment of the present invention, a protective device is provided inside the shell 2, and a grinding device is provided at the bottom of the base 1, wherein the protective device comprises: an elastic telescopic rod 41, a transmission rod 42, a support frame 43 and a square plate 44, the elastic telescopic rod 41 is fixedly mounted on the top of the base 1, the support frame 43 is fixedly mounted on the top of the base 1, the square plate 44 is fixedly mounted on the top of the elastic telescopic rod 41, and the transmission rod 42 is fixedly mounted on a side of the square plate 44 close to the L-shaped plate 31 to prevent the steel pipe from rotating during cutting, resulting in poor cutting accuracy and the need for re-cutting, thereby reducing time and material waste.

[0026] The protective device also includes: an air cylinder 45, a piston 46, a support column 47 and three air outlet holes 49. The air cylinder 45 is fixedly installed on the top of the base 1, the piston 46 is slidably installed on the inner wall of the air cylinder 45, one end of the support column 47 is fixedly installed on the top of the piston 46, and the other end of the support column 47 is fixedly installed on the bottom of the square plate 44. The three air outlet holes 49 are all opened on the surface of the air cylinder 45, so that the sparks generated during cutting will flow to the bottom due to the circulation of air, thereby reducing the damage caused by the sparks to the device inside the shell 2, improving the protection effect of the device, and extending the service life of the device.

[0027] A No. 1 spring 48 is provided between the piston 46 and the inflation cylinder 45 , and the sliding plate 36 is in contact with the transmission rod 42 , and the No. 1 spring 48 drives the piston 46 to reset.

[0028] The grinding device includes: a hollow shell 51, a cutter 52, a rotating rod 53, a rotating shaft 54, a rotating long rod 55, a grinder 56, a round rod 57, a transmission inclined rod 58 and a vertical plate 59. The hollow shell 51 is slidably installed on the inner wall of the cutting groove, the cutter 52 is fixedly installed between the hollow shells 51, and the vertical plate 59 is fixedly installed on the top of the base 1. The rotating rod 53 rotates and penetrates the inner and outer walls of the vertical plate 59. One end of the rotating rod 53 is rotatably installed on the surface of the square plate 44, so that the cutter 52 will contact and cut the steel pipe only when the steel pipe moves to the cutting area, so as to prevent the cutter 52 from idling, the blade or saw blade still rotating at a high speed, but not contacting the actual material, and the edge of the blade will rub against the air, generating unnecessary heat and Friction increases the wear rate of the blade, resulting in a shortened tool life, requiring more frequent replacement and maintenance, and reducing maintenance costs. The other end of the rotating rod 53 is rotatably mounted on the top of the hollow shell 51, the rotating shaft 54 ​​is rotatably mounted on the bottom of the base 1, the rotating long rod 55 is fixedly mounted on the circumferential surface of the rotating shaft 54, the grinder 56 is fixedly mounted on the circumferential surface of the rotating shaft 54, the round rod 57 is fixedly mounted on the surface of the hollow shell 51, and the transmission inclined rod 58 is fixedly mounted on the surface of the rotating long rod 55, so that after the cutting machine 52 completes the cutting, the remaining inertia after the blade rotates contacts the grinder 56 and grinds the blade, so that the blade is grinded after each cutting is completed to ensure the sharpness of the blade and the accuracy of the cutting.

[0029] The round rod 57 is in contact with the transmission inclined rod 58. A No. 3 torsion spring is arranged between the rotating shaft 54 ​​and the base 1, and the rotating shaft 54 ​​is driven to reset by the No. 3 torsion spring.

[0030] When the present embodiment is working, the sliding plate 36 moves and contacts with the transmission rod 42, and the sliding plate 36 moves and drives the transmission rod 42 to move toward the bottom. The transmission rod 42 moves toward the bottom and drives the square plate 44 to move toward the bottom. After the square plate 44 moves toward the bottom, it no longer contacts with the support frame 43. As the steel pipe moves toward the direction of the discharge port 7, the steel pipe contacts with the support frame 43. The steel pipe is blocked by the support frame 43 during movement, so that the steel pipe fits tightly with the fixed arc plate 33 during movement, preventing the steel pipe from rotating during cutting, resulting in poor cutting accuracy and the need for re-cutting, reducing time and material waste, and the square plate 44 moves toward the bottom and drives the support column 47 to move toward the bottom. The support column 47 moves toward the bottom and drives the piston 46 to move toward the bottom. The piston 46 moves toward the bottom and squeezes the air inside the inflation cylinder 45 to be ejected through the air outlet 49, so that the sparks generated during cutting will flow to the bottom due to the circulation of air, reducing the damage caused by the sparks to the device inside the housing 2, improving the protection effect of the device, and extending the service life of the device.

[0031] The square plate 44 moves toward the bottom and drives one end of the rotating rod 53 to rotate toward the bottom. The rotation of one end of the rotating rod 53 toward the bottom drives the other end of the rotating rod 53 to rotate toward the top. The rotation of the rotating rod 53 toward the top drives the hollow shell 51 to rotate toward the top. The rotation of the hollow shell 51 toward the top drives the cutting machine 52 to move toward the top. The movement of the cutting machine 52 toward the top cuts the steel pipe, so that the cutting machine 52 will contact and cut the steel pipe only when the steel pipe moves to the cutting area, preventing the cutting machine 52 from idling and the blade or saw blade still rotating at a high speed but not contacting the actual material. The edge of the blade will rub against the air, generating unnecessary heat and friction, increasing the wear rate of the blade, and shortening the tool life. The hollow shell 51 moves toward the top, driving the round rod 57 to move toward the top. The round rod 57 rotates toward the top, driving the transmission bevel rod 58 to rotate in the direction away from the hollow shell 51. The rotation of the transmission bevel rod 58 drives the rotating long rod 55 to rotate. The rotation of the rotating long rod 55 drives the rotating shaft 54 ​​to rotate. The rotation of the rotating shaft 54 ​​drives the grinder 56 to rotate. The rotation of the grinder 56 contacts the blade of the cutter 52, so that after the cutter 52 completes the cutting, the remaining inertia after the blade rotates contacts the grinder 56 and grinds the blade. Therefore, the blade is grinded after each cutting, thereby ensuring the sharpness of the blade and the accuracy of the cutting.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel pipe cutting device for building decoration, comprising a base (1), characterized in that: The top of the base (1) is fixedly mounted with a shell (2), the bottom of the base (1) is fixedly mounted with a support leg (6), the surface of the shell (2) is provided with a discharge port (7), the surface of the base (1) is provided with a cutting groove, the top of the base (1) is provided with a fixing device, the inside of the shell (2) is provided with a protective device, and the bottom of the base (1) is provided with a grinding device; The fixing device comprises: an L-shaped plate (31), a fixing seat (32), a fixing arc plate (33), two arc-shaped rods (34), a triangular block (35), a sliding plate (36), a pull rod (37), a U-shaped rod (38) and a sliding long rod (39); the L-shaped plate (31) is slidably mounted on the inner wall of the housing (2); a driving device is arranged inside the L-shaped plate (31); a square groove is provided on the surface of the L-shaped plate (31); the fixing seat (32) is fixedly mounted on the top of the L-shaped plate (31); and the fixing seat (32) is fixedly mounted on the top of the L-shaped plate (31). The fixed arc plate (33) is rotatably mounted on the top of the fixed seat (32), the two arc rods (34) are fixedly mounted on both ends of the fixed arc plate (33), the triangular block (35) is fixedly mounted on the surface of the arc rod (34), the sliding plate (36) is slidably mounted on the bottom of the L-shaped plate (31), the pull rod (37) is fixedly mounted on the surface of the sliding plate (36), the U-shaped rod (38) is rotatably mounted on the inner wall of the outer shell (2), and the sliding long rod (39) slides through the inner and outer walls of the outer shell (2).

2. A steel pipe cutting device for building decoration according to claim 1, characterized in that: A first torsion spring is provided between the fixed arc plate (33) and the fixed seat (32), and the U-shaped rod (38) is in contact with the triangular block (35).

3. A steel pipe cutting device for building decoration according to claim 2, characterized in that: A second torsion spring is provided between the U-shaped rod (38) and the housing (2), and the long sliding rod (39) is in contact with the U-shaped rod (38).

4. A steel pipe cutting device for building decoration according to claim 3, characterized in that: The protective device comprises: an elastic telescopic rod (41), a transmission rod (42), a support frame (43) and a square plate (44); the elastic telescopic rod (41) is fixedly mounted on the top of the base (1); the support frame (43) is fixedly mounted on the top of the base (1); the square plate (44) is fixedly mounted on the top of the elastic telescopic rod (41); and the transmission rod (42) is fixedly mounted on a side of the square plate (44) close to the L-shaped plate (31).

5. The steel pipe cutting device for building decoration according to claim 4, characterized in that: The protective device further comprises: an air cylinder (45), a piston (46), a support column (47) and three air outlet holes (49); the air cylinder (45) is fixedly mounted on the top of the base (1); the piston (46) is slidably mounted on the inner wall of the air cylinder (45); one end of the support column (47) is fixedly mounted on the top of the piston (46); the other end of the support column (47) is fixedly mounted on the bottom of the square plate (44); and the three air outlet holes (49) are all provided on the surface of the air cylinder (45).

6. A steel pipe cutting device for building decoration according to claim 5, characterized in that: A No. 1 spring (48) is provided between the piston (46) and the inflation cylinder (45), and the sliding plate (36) is in contact with the transmission rod (42).

7. A steel pipe cutting device for building decoration according to claim 6, characterized in that: The grinding device comprises: a hollow shell (51), a cutting machine (52), a rotating rod (53), a rotating shaft (54), a rotating long rod (55), a grinding machine (56), a round rod (57), a transmission inclined rod (58) and a vertical plate (59), wherein the hollow shell (51) is slidably mounted on the inner wall of the cutting groove, the cutting machine (52) is fixedly mounted between the hollow shells (51), the vertical plate (59) is fixedly mounted on the top of the base (1), the rotating rod (53) is rotatably penetrated through the inner and outer walls of the vertical plate (59), and the rotating rod One end of the rotating rod (53) is rotatably mounted on the surface of the square plate (44), the other end of the rotating rod (53) is rotatably mounted on the top of the hollow shell (51), the rotating shaft (54) is rotatably mounted on the bottom of the base (1), the rotating long rod (55) is fixedly mounted on the circumferential surface of the rotating shaft (54), the grinder (56) is fixedly mounted on the circumferential surface of the rotating shaft (54), the round rod (57) is fixedly mounted on the surface of the hollow shell (51), and the transmission inclined rod (58) is fixedly mounted on the surface of the rotating long rod (55).

8. The steel pipe cutting device for building decoration according to claim 7, characterized in that: The round rod (57) is in contact with the transmission inclined rod (58), and a No. 3 torsion spring is provided between the rotating shaft (54) and the base (1).

9. A method for using a steel pipe cutting device for building decoration, using the steel pipe cutting device for building decoration according to claim 8, characterized in that: The following steps are involved: Step 1: Place the steel pipe on top of the L-shaped plate (31), then manually rotate the fixed arc plate (33), and the rotation of the fixed arc plate (33) drives the arc rod (34) to rotate; Step 2: The arc rod (34) rotates to drive the triangular block (35) to rotate toward the bottom, and the triangular block (35) rotates to pass through the square groove. Then, due to its own appearance design, the triangular block (35) cannot rotate toward the top. After the triangular block (35) cannot rotate, the fixed arc plate (33) cannot rotate; Step 3: The fixed arc plate (33) will fix the steel pipe to prevent the steel pipe from shifting during cutting, prevent the cutting tool from being subjected to irregular reaction force, resulting in uneven cutting force, and improve the precision of cutting.

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