Protective device for cutting metal square tube

Abstract

This invention relates to the field of metal square tube cutting technology and discloses a protective device for cutting metal square tubes. The device includes a ball-joint connection mechanism and multiple axial buffer mechanisms. Internally, it comprises a hollow longitudinal rod fixedly installed at the bottom of a horizontal limiting plate, a first telescopic shaft movable along the axis of the hollow longitudinal rod and capable of moving the laser cutter, and a first helical spring providing elastic buffering for the hollow longitudinal rod and the first telescopic shaft. In the event of a collision deviating to one side of the axial direction, this protective device allows the laser cutter to adapt its angle, thereby reducing the negative impact of the impact on the laser cutter and providing protection against large-scale spatial collisions, thus improving the effective protection of the laser cutter.

Description

Technical Field

[0001] This invention relates to the field of metal square tube cutting technology, specifically a protective device for cutting metal square tubes. Background Technology

[0002] Laser cutting machines are efficient and have high cutting precision. The cutting thickness is generally small. They use a high-power-density laser beam to irradiate the material being cut. Laser cutting is characterized by low noise, low vibration, and no pollution. However, existing laser cutting equipment lacks collision protection devices. When the cutting head collides with the workpiece due to irregularities in the workpiece or improper operation, it often causes damage to both the cutting head and the workpiece. Minor damage may result in wear and paint chipping on the cutting head, while severe damage may cause deformation or even breakage of the cutting head. This not only affects the normal cutting use of the cutting head but also increases the user's operating and maintenance costs.

[0003] To this end, Chinese Patent Publication No. CN113579571A discloses a "protective device for cutting industrial robots". By setting multi-directional collision protection components, main protection components, stepped buffer components, and auxiliary protection components on the cutting head of the industrial robot, it can protect the cutting head during cutting operations, prevent damage to the cutting head when it collides with external objects, protect the normal cutting use of the cutting head, and reduce the user's use and maintenance costs. At the same time, with the locking pin and the moving plate, when the cutting head is idle, it can be moved into the main protection component, thereby avoiding damage to the cutting head caused by impacts from external objects when idle, and protecting the normal operation of the cutting head afterwards.

[0004] However, the aforementioned cutting protection device can only provide a buffering effect when a longitudinal collision (collision coinciding with the axis of the equipment) occurs. In reality, the laser cutter will encounter not only longitudinal collisions but also horizontal and oblique collisions during its movement. The aforementioned cutting protection device cannot provide effective protection against collisions that are biased to one side of the axis, thus having significant limitations in its use. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a protective device for cutting metal square tubes. When a collision occurs that deviates to one side of the axial direction, the laser cutter can adapt to the angle change, thereby reducing the negative impact of the impact on the laser cutter. It has the ability to protect against collisions over a wide range of spaces, thus improving the effective protection of the laser cutter and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a protective device for cutting metal square tubes, comprising a laser cutter with a No. 1 connecting plate installed at one end and capable of laser cutting square tubes, and a ball joint connecting mechanism, which internally includes a horizontal limiting plate in a horizontal state, a rotating ball head rotatably installed at the center of the horizontal limiting plate, and a pull rope that can cause the rotating ball head to rotate and reset after being subjected to tension; and multiple axial buffer mechanisms, which internally include a longitudinal hollow rod fixedly installed at the bottom of the horizontal limiting plate and having a hollow interior, a No. 1 telescopic shaft that can move along the axis of the longitudinal hollow rod and can drive the laser cutter to move, and a No. 1 helical spring that provides elastic buffering function for the longitudinal hollow rod and the No. 1 telescopic shaft.

[0007] Preferably, the ball joint connection mechanism includes a second connecting plate. The horizontal limiting plate has a spherical cavity with open ends at its center. A rotatable ball head is placed inside the spherical cavity on the horizontal limiting plate. The top of the ball head has a recessed first wire fixing groove. One end of the pull rope is fixedly installed inside the first wire fixing groove. The bottom of the ball head has an axial connecting rod integrally formed with it. The bottom end of the axial connecting rod has a second connecting plate integrally formed with it. The bottom end of the second connecting plate is fixedly connected to the first connecting plate.

[0008] Preferably, when the pull rope is taut, the axis of the pull rope, the rotating ball head, the axial connecting rod, the second connecting plate, and the laser cutter are all on the same straight line.

[0009] Preferably, the structural radius of the spherical cavity is the same as the structural radius of the outer surface of the rotating ball head, and the diameter of the top and bottom ends of the spherical cavity is greater than the structural radius of the outer surface of the rotating ball head and smaller than the structural diameter of the outer surface of the rotating ball head.

[0010] Preferably, the rotating ball head has a hollow cavity inside to reduce its own mass.

[0011] Preferably, the axial buffer mechanism includes an inner movable plate, a No. 3 connecting plate integrally formed with the top of the longitudinal hollow rod, a No. 1 longitudinal component movable cavity inside the longitudinal hollow rod, a No. 1 shaft through hole connecting the space below it and the bottom of the No. 1 longitudinal component movable cavity at the center of the bottom of the longitudinal hollow rod, an inner movable plate capable of axial movement along the No. 1 longitudinal component movable cavity is placed inside the longitudinal hollow rod, the top of the inner movable plate is fixedly installed with a No. 1 helical spring in a compressed state, a No. 1 telescopic shaft passing through the No. 1 shaft through hole is fixedly installed at the center of the bottom of the inner movable plate, a No. 4 connecting plate is fixedly installed at the bottom of the No. 1 telescopic shaft, and the bottom of the No. 4 connecting plate is fixedly installed on the upper surface of the horizontal limiting plate.

[0012] Preferably, it also includes an adjustable reset mechanism, the structure of which includes a hollow rotating column connected to the third connecting plate and having a hollow interior, an upper limit plate located on the axis of the hollow rotating column and capable of driving one end of the pull rope to move, a second helical spring that generates an upward elastic force on the upper limit plate, and a threaded sleeve capable of changing the elastic strength of the second helical spring.

[0013] Preferably, the adjustable reset mechanism includes a collar; the top of the hollow rotating column is provided with a No. 5 connecting plate fixedly connected to the connection part of the moving robotic arm; the bottom end of the hollow rotating column is provided with an externally threaded rod integrally formed therewith; the bottom end of the externally threaded rod is provided with a No. 6 connecting plate integrally formed therewith; the bottom surface of the No. 6 connecting plate is fixedly connected to the upper surface of the No. 3 connecting plate; the hollow rotating column has a No. 2 longitudinal component movable cavity inside; two symmetrical longitudinal grooves communicating with the No. 2 longitudinal component movable cavity are provided at the circumferential wall thickness of the hollow rotating column; a No. 2 shaft through hole is provided at the center of the externally threaded rod; and a component capable of moving axially along the No. 2 longitudinal component movable cavity is placed inside the hollow rotating column located within the No. 2 longitudinal component movable cavity. The upper and lower limit plates are fixedly installed together with a No. 2 helical spring in a compressed state. The center of the lower limit plate has a No. 3 shaft through hole with both ends open. The side of the lower limit plate is fixedly installed with two L-shaped sliding rods that pass through the longitudinal sliding grooves and can move longitudinally along the longitudinal sliding grooves. The bottom end of the L-shaped sliding rod is fixedly installed on the upper surface of the collar. The annular hole of the collar is fitted with a threaded sleeve through a bearing. The center of the threaded sleeve has an internal threaded hole that is installed on the external threaded rod body through a threaded structure. The bottom of the upper limit plate is fixedly installed with a No. 2 telescopic shaft that passes through the No. 3 shaft through hole and the No. 2 shaft through hole. The bottom end of the No. 2 telescopic shaft has a No. 2 line fixing groove for fixing the other end of the pull rope.

[0014] Preferably, the threaded structure includes an internal thread structure disposed on the inner wall of the threaded sleeve and an external thread structure disposed on the external thread rod body, and the internal thread structure matches the external thread structure.

[0015] Preferably, the cross-sectional shapes of the third shaft perforation and the second shaft perforation are consistent with the cross-sectional shape of the second telescopic shaft, both being polygonal structures, and the structural dimensions of the cross-sectional shapes of the third shaft perforation and the second shaft perforation match the structural dimensions of the cross-sectional shape of the second telescopic shaft.

[0016] Compared with the prior art, the present invention provides a protective device for cutting metal square tubes, which has the following beneficial effects: when a collision occurs to one side of the axial direction, the laser cutter can undergo an adaptive angle change, thereby reducing the negative impact of the impact on the laser cutter and providing protection against collisions over a wide range of spaces, thus improving the effective protection of the laser cutter. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0019] Figure 3 This is a perspective view of the ball joint connection mechanism in this invention;

[0020] Figure 4 This is a three-dimensional cross-sectional view of the ball joint connection mechanism in this invention;

[0021] Figure 5 This is a perspective view of the axial buffer mechanism in this invention;

[0022] Figure 6 This is a three-dimensional cross-sectional view of the axial buffer mechanism in this invention;

[0023] Figure 7 This is a perspective view of the adjustable reset mechanism in this invention;

[0024] Figure 8 This is a three-dimensional cross-sectional view of the adjustable reset mechanism in this invention.

[0025] The components include: 1. Laser cutter; 2. Connecting plate No. 1; 3. Ball joint connecting mechanism; 31. Horizontal limiting plate; 32. Spherical cavity; 33. Rotating ball head; 34. Hollow cavity; 35. Line fixing groove No. 1; 36. Pull rope; 37. Axial connecting rod; 38. Connecting plate No. 2; 4. Axial buffer mechanism; 41. Longitudinal hollow rod; 42. Connecting plate No. 3; 43. Movable cavity of longitudinal component No. 1; 44. Helical spring No. 1; 45. Inner movable plate; 46. Through hole of shaft No. 1; 47. Telescopic shaft No. 1; 48. Four 5. Connecting disc No. 5; 5. Adjustable reset mechanism; 51. Hollow rotating column; 52. Connecting disc No. 5; 53. External threaded rod; 54. Moving cavity of longitudinal component No. 2; 55. Longitudinal slide groove; 56. Through hole of shaft No. 2; 57. Upper limit plate; 58. Lower limit plate; 59. Through hole of shaft No. 3; 510. Helical spring No. 2; 511. L-shaped sliding connecting rod; 512. Collar; 513. Threaded sleeve; 514. Internal threaded hole; 515. Telescopic shaft No. 2; 516. Connecting disc No. 6; 517. Line fixing groove No. 2. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 and Figure 2 A protective device for cutting metal square tubes includes a laser cutter 1 with a No. 1 connecting plate 2 installed at one end and capable of laser cutting the square tube. The No. 5 connecting plate 52 is fixedly connected to the connection part of the robotic arm for movement. The laser cutter 1 is started, and the robotic arm is controlled to laser cut the square tube.

[0028] To achieve collision protection against axial deviation, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 A ball joint connection mechanism 3 needs to be set up, which has a horizontal limiting plate 31 in a horizontal state, a rotating ball head 33 installed in the center of the horizontal limiting plate 31 in a rotatable form, and a pull rope 36 that can make the rotating ball head 33 rotate and reset after being pulled. When the laser cutter 1 is hit by a collision that is biased to one side of the axis, and the force of the collision is greater than the friction between the horizontal limiting plate 31 and the rotating ball head 33, the laser cutter 1 and the rotating ball head 33 will rotate accordingly, thereby reducing the damage to the laser cutter 1 caused by the collision in that direction and realizing the protection against collisions that are biased to one side of the axis.

[0029] For details regarding the specific structure of the ball joint connection mechanism 3, please refer to [link / reference]. Figure 3 and Figure 4 The system includes a second connecting plate 38. A spherical cavity 32 with open ends is located at the center of the horizontal limiting plate 31. A rotatable rotating ball head 33 is placed inside the spherical cavity 32. A concave first-line fixing groove 35 is provided at the top of the rotating ball head 33. One end of the pull rope 36 is fixedly installed inside the first-line fixing groove 35. An axial connecting rod 37 is integrally formed with the rotating ball head 33 at its bottom. A second connecting plate 38 is integrally formed with the axial connecting rod 37 at its bottom end. The bottom end of the second connecting plate 38 is fixedly connected to the first connecting plate 2. When the pull rope 36 is taut, the axis of the pull rope 36, the rotating ball head 33, the axial connecting rod 37, the second connecting plate 38, and the laser cutter 1 are on the same straight line. The structural radius of the spherical cavity 32 is consistent with the structural radius of the outer surface of the rotating ball head 33. The diameter of the top and bottom of the spherical cavity 32 is larger than the structural radius of the outer surface of the rotating ball head 33 and smaller than the structural diameter of the outer surface of the rotating ball head 33. The rotating ball head 33 has a hollow cavity 34 inside to reduce its own mass.

[0030] To achieve axial collision protection, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 5 and Figure 6 Multiple axial buffer mechanisms 4 need to be set up. Each mechanism has a hollow longitudinal rod 41 fixedly installed at the bottom of the horizontal limiting plate 31 and hollow inside, a telescopic shaft 47 that can move along the axis of the hollow longitudinal rod 41 and drive the laser cutter 1 to move, and a helical spring 44 that provides elastic buffering for the hollow longitudinal rod 41 and the telescopic shaft 47. When the laser cutter 1 is impacted in the axial direction, the force is transmitted to the inner movable plate 45, which puts pressure on the helical spring 44, causing the helical spring 44 to be elastically compressed. Under this condition, the helical spring 44 provides longitudinal buffering, thereby achieving axial impact protection.

[0031] For details regarding the specific structure of the axial buffer mechanism 4, please refer to [link / reference]. Figure 5 and Figure 6The system includes an inner movable plate 45. A third connecting plate 42, integrally formed with the top of the longitudinal hollow rod 41, is provided inside the longitudinal hollow rod 41. A first longitudinal component movable cavity 43 is provided inside the longitudinal hollow rod 41. A first shaft through hole 46, connecting the space below it and the bottom of the first longitudinal component movable cavity 43, is provided at the center of the bottom of the longitudinal hollow rod 41. An inner movable plate 45, capable of moving axially along the first longitudinal component movable cavity 43, is placed inside the first longitudinal component movable cavity 43. A first helical spring 44 in a compressed state is fixedly installed on the top of the inner movable plate 45. A first telescopic shaft 47, penetrating the first shaft through hole 46, is fixedly installed at the center of the bottom of the inner movable plate 45. A fourth connecting plate 48 is fixedly installed at the bottom of the first telescopic shaft 47. The bottom of the fourth connecting plate 48 is fixedly installed on the upper surface of the horizontal limiting plate 31.

[0032] To achieve the reset function of the flexible adjustable laser cutter 1 and the rotating ball head 33, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 7 and Figure 8 An adjustable reset mechanism 5 needs to be set up. Its structure includes a hollow rotating column 51 connected to the third connecting plate 42 and having a hollow interior; an upper limit plate 57 located on the axis of the hollow rotating column 51 and capable of driving one end of the pull rope 36; a second helical spring 510 that exerts an upward elastic force on the upper limit plate 57; and a threaded sleeve 513 capable of changing the elastic strength of the second helical spring 510. Directional rotation of the threaded sleeve 513, due to the threaded connection, causes the threaded sleeve 513 to drive the L-shaped sliding connecting rod 511 to move longitudinally. The L-shaped sliding connecting rod 511 then drives the lower limit plate 58 to move longitudinally. At this time, because the rotating ball head 33 is stuck in the horizontal limit plate 31, the upper limit plate 57 cannot move longitudinally. The movement changes the distance between the lower limit plate 58 and the upper limit plate 57, thus altering the elasticity of the second helical spring 510. The elastic force of the second helical spring 510 on the upper limit plate 57 is indirectly transferred between the contact surfaces of the rotating ball head 33 and the horizontal limit plate 31. When the rotating ball head 33 changes direction, the pull rope 36 extends and becomes eccentric. Simultaneously, the upper limit plate 57 moves downward. After the collision, due to the elastic potential energy of the second helical spring 510, the upper limit plate 57 returns to its original position. At the same time, the pull rope 36 causes the laser cutter 1 and the rotating ball head 33 to return to their original positions, thereby realizing the elastically adjustable return function of the laser cutter 1 and the rotating ball head 33.

[0033] For details regarding the specific structure of the adjustable reset mechanism 5, please refer to [link / reference needed]. Figure 7 and Figure 8The hollow rotating column 51 includes a collar 512. The top of the hollow rotating column 51 is provided with a fifth connecting plate 52, which is fixedly connected to the connecting part of the moving robotic arm. The bottom of the hollow rotating column 51 is provided with an externally threaded rod 53 integrally formed therewith. The bottom of the externally threaded rod 53 is provided with a sixth connecting plate 516 integrally formed therewith. The bottom surface of the sixth connecting plate 516 is fixedly connected to the upper surface of the third connecting plate 42. The hollow rotating column 51 has a second longitudinal component movable cavity 54 inside. Two symmetrical... Furthermore, the longitudinal groove 55 connects to the movable cavity 54 of the second longitudinal component. The center of the external threaded rod 53 is provided with a second shaft through hole 56. The hollow rotating column 51 houses an upper limit plate 57 and a lower limit plate 58 that can move along the axial direction of the movable cavity 54 of the second longitudinal component inside the movable cavity 54 of the second longitudinal component. A second helical spring 510 in a compressed state is fixedly installed between the upper limit plate 57 and the lower limit plate 58. The center of the lower limit plate 58 is provided with a third shaft through hole 59 with both ends open. Two through holes are fixedly installed on the side of the lower limit plate 58. An L-shaped sliding link 511, capable of moving longitudinally along a longitudinal groove 55, has its bottom end fixedly mounted on the upper surface of a collar 512. A threaded sleeve 513 is installed inside the annular hole of the collar 512 via a bearing. The center of the threaded sleeve 513 has an internal threaded hole 514 installed on the external threaded rod 53 via a threaded structure. A second telescopic shaft 515, which passes through the third shaft through hole 59 and the second shaft through hole 56, is fixedly mounted on the bottom of the upper limit plate 57. The bottom end of the second telescopic shaft 515 is provided with a fixing device. The second wire fixing groove 517 of the other end of the pull rope 36, the thread structure includes an internal thread structure set on the inner wall of the threaded sleeve 513 and an external thread structure set on the rod body of the external thread rod 53, and the internal thread structure matches the external thread structure. The structural shape of the cross-section of the third shaft through hole 59 and the second shaft through hole 56 is consistent with the structural shape of the cross-section of the second telescopic shaft 515, both of which are polygonal structures, and the structural dimensions of the cross-section of the third shaft through hole 59 and the second shaft through hole 56 match the structural dimensions of the cross-section of the second telescopic shaft 515.

[0034] In use, the No. 5 connecting plate 52 is fixedly connected to the connecting part of the robotic arm used for movement. The laser cutter 1 is started, and the robotic arm is then controlled to perform laser cutting on the square tube. When the laser cutter 1 experiences a collision to one side of the axial direction, and the force of the collision is greater than the friction between the horizontal limit plate 31 and the rotating ball head 33, the laser cutter 1 and the rotating ball head 33 will rotate accordingly, thereby reducing the damage to the laser cutter 1 caused by the collision in that direction and achieving protection against collisions to one side of the axial direction. At the same time, after the collision, due to the elastic potential energy of the No. 2 helical spring 510, the upper limit plate 57 will reset upward. Simultaneously, the pull rope 36 will cause the laser cutter 1 and the rotating ball head 33 to reset. When the laser cutter 1 is subjected to an axial collision, the force will be transmitted to the inner movable plate 45, causing the inner movable plate 45 to exert pressure on the No. 1 helical spring 44, thereby causing the No. 1 helical spring 44 to undergo elastic compression. Under this phenomenon, the No. 1 helical spring 44 will provide a longitudinal buffer function, thereby achieving protection against collisions in the axial direction.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective device for cutting metal square tubes, comprising a laser cutter (1) with a connecting plate (2) installed at one end and capable of laser cutting square tubes, characterized in that: It also includes, The ball joint connection mechanism (3) has a horizontal limiting plate (31) in a horizontal state, a rotating ball head (33) installed in the center of the horizontal limiting plate (31) in a rotatable form, and a pull rope (36) that can make the rotating ball head (33) rotate and reset after being subjected to tension. And multiple axial buffer mechanisms (4), which are provided with a longitudinal hollow rod (41) fixedly installed at the bottom of the horizontal limiting plate (31) and hollow inside, a first telescopic shaft (47) that can move along the axis of the longitudinal hollow rod (41) and can drive the laser cutter (1) to move, and a first helical spring (44) that provides elastic buffering function for the longitudinal hollow rod (41) and the first telescopic shaft (47); It also includes an adjustable reset mechanism (5), the structure of which includes a hollow rotating column (51) connected to the third connecting plate (42) and hollow inside, an upper limit plate (57) located on the axis of the hollow rotating column (51) and capable of driving one end of the pull rope (36) to move, a second helical spring (510) that generates an upward elastic force on the upper limit plate (57), and a threaded sleeve (513) that can change the elastic strength of the second helical spring (510).

2. The protective device for cutting metal square tubes according to claim 1, characterized in that: The ball joint connection mechanism (3) includes a second connecting plate (38). The center of the horizontal limiting plate (31) is provided with a spherical cavity (32) with both ends open. The horizontal limiting plate (31) has a rotating ball head (33) that can rotate inside the spherical cavity (32). The top of the rotating ball head (33) is provided with a first line body fixing groove (35) with a concave structure. The line body at one end of the pull rope (36) is fixedly installed inside the first line body fixing groove (35). The bottom of the rotating ball head (33) is provided with an axial connecting rod (37) with an integral structure. The bottom end of the axial connecting rod (37) is provided with a second connecting plate (38) with an integral structure. The bottom end of the second connecting plate (38) is fixedly connected to the first connecting plate (2).

3. The protective device for cutting metal square tubes according to claim 2, characterized in that: When the pull rope (36) is taut, the axis of the pull rope (36), the rotating ball head (33), the axial connecting rod (37), the second connecting plate (38), and the laser cutter (1) are on the same straight line.

4. The protective device for cutting metal square tubes according to claim 3, characterized in that: The structural radius of the spherical cavity (32) is consistent with the structural radius of the outer surface of the rotating ball head (33), and the diameter of the top and bottom of the spherical cavity (32) is greater than the structural radius of the outer surface of the rotating ball head (33) and smaller than the structural diameter of the outer surface of the rotating ball head (33).

5. A protective device for cutting metal square tubes according to claim 4, characterized in that: The rotating ball head (33) has a hollow cavity (34) inside to reduce its own mass.

6. The protective device for cutting metal square tubes according to claim 5, characterized in that: The axial buffer mechanism (4) includes an inner movable plate (45). The top end of the longitudinal hollow rod (41) is provided with a No. 3 connecting plate (42) integrally formed with it. The interior of the longitudinal hollow rod (41) is provided with a No. 1 longitudinal component movable cavity (43). The bottom center of the longitudinal hollow rod (41) is provided with a No. 1 shaft through hole (46) connecting the space below it and the bottom end of the No. 1 longitudinal component movable cavity (43). The longitudinal hollow rod (41) is installed inside the No. 1 longitudinal component movable cavity (43). An inner movable plate (45) capable of moving axially along the movable cavity (43) of the first longitudinal component is placed there. A first helical spring (44) in a compressed state is fixedly installed on the top of the inner movable plate (45). A first telescopic shaft (47) penetrating the first shaft body through hole (46) is fixedly installed at the center of the bottom end of the inner movable plate (45). A fourth connecting plate (48) is fixedly installed at the bottom end of the first telescopic shaft (47). The bottom end of the fourth connecting plate (48) is fixedly installed on the upper surface of the horizontal limiting plate (31).

7. A protective device for cutting metal square tubes according to claim 6, characterized in that: The adjustable reset mechanism (5) includes a collar (512). The top end of the hollow rotating column (51) is provided with a No. 5 connecting plate (52) that is fixedly connected to the connection part of the moving robotic arm. The bottom end of the hollow rotating column (51) is provided with an external threaded rod (53) integrally formed with it. The bottom end of the external threaded rod (53) is provided with a No. 6 connecting plate (516) integrally formed with it. The bottom surface of the No. 6 connecting plate (516) is fixedly connected to the upper surface of the No. 3 connecting plate (42). The hollow rotating column (51) has a second longitudinal component movable cavity (54) inside. Two symmetrical longitudinal grooves (55) connecting the second longitudinal component movable cavity (54) are provided at the circumferential wall thickness of the hollow rotating column (51). A second shaft through hole (56) is provided at the center of the external threaded rod (53). An upper limit plate (57) and a lower limit plate (58) capable of moving axially along the second longitudinal component movable cavity (54) are placed inside the hollow rotating column (51). A second-order helical spring (510) in a compressed state is fixedly installed between the upper limit plate (57) and the lower limit plate (58). The lower limit plate (58) has a third-order shaft through hole (59) with both ends open at the center. Two L-shaped sliding connecting rods (511) with longitudinal grooves (55) through which the lower limit plate (58) can move longitudinally are fixedly installed on the side of the lower limit plate (58). The bottom end of the L-shaped sliding connecting rod (511) is fixedly installed on the upper surface of the collar (512). 12) The annular hole is fitted with a threaded sleeve (513) through a bearing. The center of the threaded sleeve (513) is provided with an internal threaded hole (514) that is installed on the external threaded rod (53) through a threaded structure. The bottom of the upper limit plate (57) is fixedly fitted with a second telescopic shaft (515) that passes through the third shaft through hole (59) and the second shaft through hole (56) in sequence. The bottom end of the second telescopic shaft (515) is provided with a second wire fixing groove (517) for fixing the wire body of the other end of the pull rope (36).

8. A protective device for cutting metal square tubes according to claim 7, characterized in that: The threaded structure includes an internal threaded structure located on the inner circumference of the threaded sleeve (513) and an external threaded structure located on the body of the external threaded rod (53), and the internal threaded structure matches the external threaded structure.

9. A protective device for cutting metal square tubes according to claim 8, characterized in that: The cross-sectional shapes of the No. 3 shaft perforation (59) and the No. 2 shaft perforation (56) are consistent with the cross-sectional shape of the No. 2 telescopic shaft (515), both being polygonal structures. Furthermore, the structural dimensions of the cross-sections of the No. 3 shaft perforation (59) and the No. 2 shaft perforation (56) match the structural dimensions of the cross-section of the No. 2 telescopic shaft (515).

Images