A cutting device for square tube forming production line

Abstract

The application relates to a cutting device for a square tube forming production line, which comprises a rack, a first sliding table, a second sliding table, a cutting mechanism, a tool changing mechanism and a driving mechanism. The cutting mechanism comprises a rotating drum, two main shaft boxes, a tool holder and a driving part. The tool changing mechanism is used for replacing saw blades on the tool holder and comprises pneumatic clamps, a tool holder mounting device, a tool holder dismounting device and a driving assembly. The first sliding table carries the cutting mechanism, the second sliding table carries the tool changing mechanism, the double sliding tables are independently driven and are designed to be switched in linkage, the sliding directions of the two are parallel, the stability during cutting operation is ensured, the tool changing action can be realized through linkage, and the integration degree of the equipment is improved. The combination of the rotating drum, the double main shaft boxes and the tool holder realizes synchronous cutting of double saw blades and adapts to cutting requirements of different specifications; the saw blades are detachably connected, thereby providing a structural basis for rapid tool changing. The tool changing mechanism is used for completing the dismounting and mounting of the saw blades, thereby reducing the possibility of interrupting the continuous production rhythm, improving the automation degree of the production line and the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of cutting equipment technology, and in particular to a cutting equipment for a square tube forming production line. Background Technology

[0002] Square tubes are typically formed by repeatedly cold-bending and folding steel coils. After forming, a CNC sawing machine is a specialized CNC equipment for precise dimensional cutting of the finished square tube, primarily designed for large-volume, conventional straight-cut applications. This equipment uses a CNC system as its core, coupled with a servo feeding mechanism and high-precision positioning components, to automatically complete the entire process of square tube loading, positioning, clamping, sawing, and unloading. Its core actuators are carbide circular saw blades or high-speed steel saw blades, enabling burr-free, low-deformation, and smooth cross-section cutting. It also allows for preset cutting lengths of multiple specifications, supports batch programmed processing, and effectively avoids dimensional errors associated with manual cutting.

[0003] In existing square tube cutting equipment, the saw blades suffer from wear and tooth breakage after prolonged, high-frequency cutting operations, necessitating machine shutdown and blade replacement. Furthermore, because the sawing station is rigidly linked to the upstream forming and conveying stages of the production line, the entire square tube forming production line must simultaneously shut down when the sawing machine stops, disrupting continuous production and reducing production capacity. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a cutting device for a square tube forming production line.

[0005] The cutting equipment for a square tube forming production line provided in this application adopts the following technical solution: A cutting device for a square tube forming production line includes a frame, a first slide table, a second slide table, a cutting mechanism, a tool changing mechanism, and a driving mechanism. The first slide table and the second slide table are slidably connected to the frame, and the sliding directions of the first slide table and the second slide table are parallel. The driving mechanism is used to drive the sliding of the first slide table and the second slide table respectively. The cutting mechanism includes a rotary drum, two spindle boxes, a tool holder, and a drive unit. The rotary drum is rotatably connected to a first slide table. The two spindle boxes are slidably connected inside the rotary drum. The tool holder is detachably connected to the rotary drum. Two tool handles are movably connected to the tool holder. The two tool handles correspond to the two spindle boxes respectively. A saw blade is installed on each of the two tool handles. The drive unit is used to drive the rotation of the rotary drum and the movement of the spindle boxes respectively. The tool changing mechanism is used to replace the saw blade on the tool holder. The tool changing mechanism includes a pneumatic gripper, a tool mounting frame, a tool dismounting frame, and a drive assembly. The pneumatic gripper is movably connected to the second slide table and is used to move the tool holder out of the rotating drum. The tool mounting frame and the tool dismounting frame are slidably connected to the second slide table. The tool dismounting frame is used to remove the saw blade from the tool handle, and the tool mounting frame is used to install the saw blade onto the tool holder. The drive assembly is used to drive the movement of the pneumatic gripper, the tool dismounting frame, and the tool mounting frame respectively. When the tool holder on the spindle box needs to be replaced, the drive mechanism drives the first slide and the second slide to move to an adjacent position and move together. The drive assembly drives the pneumatic gripper to clamp and move the tool holder inside the rotating drum. The tool removal holder moves to unlock the tool holder so that the saw blade falls off. The tool mounting holder installs the new saw blade onto the tool holder.

[0006] By adopting the above technical solution, the drive mechanism independently moves the first and second slides, positioning the saw blade of the cutting mechanism at the cutting position. The drive unit moves the spindle box, causing the saw blade to cut into the square tube and driving the rotary drum to rotate, completing the cutting of the square tube. When the saw blade needs to be replaced, the drive mechanism moves the first and second slides to adjacent positions and locks them in place, fixing their positions. The drive assembly is activated, and the pneumatic gripper extends into the rotary drum, gripping and removing the entire blade holder. The blade removal holder moves into position, unlocking the saw blade on the handle, allowing the old saw blade to fall off. Subsequently, the blade mounting holder moves, installing and locking the new saw blade onto the handle. Finally, the pneumatic gripper reinstalls the blade holder back onto the rotary drum.

[0007] The first slide table carries the cutting mechanism, and the second slide table carries the tool changing mechanism. The two slide tables are independently driven and linked for switching. Their parallel sliding directions ensure stability during cutting operations and enable tool changing through linkage, improving equipment integration. The cutting mechanism is modular, consisting of a combination of a rotary drum, dual spindle boxes, and a tool holder, allowing for simultaneous cutting of various sizes of tubing with dual saw blades. The saw blades are detachable, providing a structural basis for rapid tool changing. The tool changing mechanism facilitates saw blade disassembly and installation, replacing manual tool changing, reducing labor costs, minimizing the possibility of interrupting continuous production, and improving production line automation and efficiency.

[0008] Preferably, the tool holder has two sliding seats slidably connected to it, the tool handle is rotatably connected to the sliding seats, a plurality of limiting blocks are slidably connected to the tool handle along a direction perpendicular to the axis of the tool handle, a guide post is slidably connected to the tool handle along its circumference, and a guide rail is provided around the guide post. One end of each of the limiting blocks is slidably connected to the guide rail along the axis of the guide post. When the limiting blocks slide toward the saw blade, the limiting blocks slide toward the axis of the guide post to unlock the saw blade. When the limiting blocks slide toward the side away from the saw blade, the limiting blocks slide toward the side away from the axis of the guide post.

[0009] By adopting the above technical solution, when installing the saw blade, the guide column is pushed to move axially, and the guide rail on it forces the limiting block to engage with the recess or end face of the saw blade's central hole in a direction away from the axis of the guide column, thereby locking the saw blade. When removing the saw blade, the guide column is pulled in the opposite direction, and the guide rail causes the limiting block to retract towards the axis of the guide column, thereby releasing the locking of the saw blade, and the saw blade can be removed. The synchronous opening and closing of multiple radial limiting blocks can be achieved through a single axial linear motion, and the action is fast and reliable. The locking force comes from the mechanical structure, eliminating the need to arrange electric or pneumatic components on the high-speed rotating handle. The structure is simple and stable, and suitable for high-speed rotation conditions. Multiple circumferentially distributed limiting blocks can provide uniform clamping force and good centering effect, ensuring the accuracy of saw blade installation and rigidity during cutting.

[0010] Preferably, the tool holder has multiple mating blocks on the side away from the limiting block. The multiple mating blocks are arranged in a tapering shape from the side near the tool holder to the side away from the tool holder. The multiple mating blocks are evenly distributed around the circumference of the tool holder. One end of the output shaft of the spindle box is coaxially and fixedly connected to a drive ring. The drive ring has multiple mating grooves that can mate with the mating blocks. When the tool holder is installed on the rotary drum, the mating groove on the corresponding drive ring mates with the mating block on the corresponding tool holder.

[0011] By adopting the above technical solution, when the pneumatic gripper installs the tool holder onto the rotary drum, the drive ring on the output shaft of the spindle box synchronously approaches the tool holder; the mating groove on the drive ring automatically aligns and engages with the tapered mating block on the tool holder; during cutting, the spindle box drives the drive ring to rotate, and through the engagement of the mating groove and the inclined surface of the mating block, the torque is efficiently and smoothly transmitted to the tool holder and saw blade; the connection of the power transmission mechanism is completed during the tool holder installation process, without the need for additional steps, further accelerating the tool changing speed; the engagement of multiple tapered blocks with the groove can transmit a large torque, and the connection rigidity is good; the tapered inclined surface has a guiding effect during engagement and can tolerate small axial position errors, improving the fault tolerance and success rate of docking.

[0012] Preferably, the tool holder is provided with two sets of guide rods, each set of guide rods corresponding to two sliding seats. Each set of guide rods includes several guide rods, which pass through the corresponding sliding seats and allow the corresponding sliding seats to slide on the guide rods. Each of the several guide rods is fitted with a spring, and the two ends of the several springs abut against the corresponding sliding seats and the tool holder. The several springs always drive the corresponding sliding seats to slide towards one side of the tool holder's length direction, and the sliding directions of the two sliding seats are arranged opposite to each other.

[0013] By adopting the above technical solution, when the tool holder is removed from the rotary drum by the pneumatic gripper and the tool handle is disengaged from the spindle box, the two sliding seats are automatically driven to their respective extreme end positions along the length of the tool holder under the action of their springs. At this time, the position of the tool handle relative to the tool holder is fixed and known. When the tool holder with a new saw blade is reinstalled into the rotary drum by the pneumatic gripper, since the two tool handles have been pre-positioned at the determined ends by the springs, their axial and radial relative positions with the output shaft of the spindle box are highly predictable. This greatly simplifies the docking process, and the mating groove of the drive ring can smoothly engage with the mating block on the tool handle. This ensures that each time the tool holder is processed as an independent module by the tool changing mechanism, its internal tool handle is in a uniform and standard initial state. This eliminates installation errors caused by different cutting positions in the previous operation, enabling the power docking of the tool holder and the spindle box to be completed quickly, accurately, and reliably each time. The control system does not require additional sensors and complex algorithms to calibrate the position of the internal tool handle of the tool holder, reducing system complexity.

[0014] Preferably, the drive assembly includes a first electric cylinder, a second electric cylinder, and a movable base. The first electric cylinder is mounted on a second slide and is used to drive the sliding of the tool holder. The second electric cylinder is mounted on the second slide and is used to drive the sliding of the tool removal holder. The sliding base is slidably connected to the second slide. The pneumatic gripper is slidably connected to the sliding base. One end of the sliding base is movable into the rotating drum. A first lead screw is rotatably connected to the second slide. The first lead screw passes through and is threadedly connected to the sliding base. A first motor is provided on the second slide and is used to drive the rotation of the first lead screw. A second lead screw is rotatably connected to the sliding base. The second lead screw passes through and is threadedly connected to the pneumatic gripper. A second motor is provided on the sliding base and is used to drive the rotation of the second lead screw.

[0015] By adopting the above technical solution, the first motor drives the first lead screw, which moves the entire movable seat along the second slide, achieving coarse positioning of the tool changing mechanism and the rotary drum. The second motor drives the second lead screw, finely adjusting the position of the pneumatic gripper on the movable seat, enabling it to accurately extend into the rotary drum and grasp the tool holder. The first and second electric cylinders respectively drive the tool mounting and dismounting holders to extend or retract independently, performing the specific actions of disassembling and mounting the saw blade. The tool changing action is decomposed into multiple linear movements, controlled separately by the lead screw and electric cylinders, ensuring the accuracy and reliability of each action step.

[0016] Preferably, the rotating drum is provided with an embedding groove. When the tool holder moves into the rotating drum, the tool holder is located in the embedding groove. The rotating drum is provided with a plurality of pneumatic pressure blocks, which can be moved to limit the tool holder in the rotating drum. A through groove is provided on the circumferential side of the rotating drum, and one end of the sliding seat can extend into the through groove.

[0017] By employing the above technical solution, when the pneumatic gripper loads the tool post into the rotary drum, the tool post is positioned within the embedding slot. The embedding slot provides initial, precise radial and circumferential positioning for the tool post, ensuring it does not tilt and roughly aligning the mating block on the tool holder with the mating slot of the spindle box drive ring. After the tool post is in place, several pneumatic clamping blocks inside the rotary drum firmly secure the tool post within the embedding slot. The through-slot design allows the tool changing mechanism to directly contact the tool post.

[0018] Preferably, the tool holder is provided with a tool clamp and a first top block. The tool clamp is used to hold the saw blade. When the tool clamp holds the saw blade, the first top block is coaxially arranged with the saw blade. When the tool holder slides toward the pneumatic clamp, the first top block can abut against the limiting block of the tool handle. The tool removal holder is provided with a second top block. When the tool removal holder slides toward the pneumatic clamp, the second top block can abut against the limiting block of the tool handle.

[0019] By adopting the above technical solution, the saw blade release holder moves towards the saw blade holder, where the second top block precisely abuts the end of the guide post and continues to advance, pushing the guide post in the unlocking direction to complete the saw blade unlocking. The saw blade mounting holder moves towards the saw blade holder; firstly, its tool grippers position the new saw blade on the handle; then, the first top block abuts the end of the guide post and pushes it in the locking direction, causing the limiting block to expand and lock the new saw blade. The saw blade release and mounting functions are distributed to two independent components, each performing only one core action, resulting in a simple mechanism and low failure rate. The saw blade mounting holder integrates the functions of clamping the saw blade and pushing the locking mechanism, completing the placement and fixation of the saw blade in a single action flow.

[0020] Preferably, the driving mechanism includes a lead screw and a plug. The lead screw is rotatably connected to the frame and threadedly connected to a first slide. A drive motor is provided on the frame to drive the rotation of the lead screw. The plug is slidably connected to the second slide along a sliding direction perpendicular to the second slide. The first slide has a plug hole for plugging into the plug. A hydraulic cylinder is installed on the second slide to drive the sliding of the plug. When the second slide needs to slide, the plug engages with the plug hole.

[0021] By adopting the above technical solution, during normal operation, the hydraulic cylinder retracts the insertion pin, and the first slide is moved by its own drive motor via a lead screw, while the second slide can move independently. When a tool change is required, the first slide moves to the predetermined tool change position. The second slide moves to align with the first slide, and the hydraulic cylinder pushes out the insertion pin, inserting it into the insertion hole of the first slide, thus mechanically locking the two slides. Subsequently, the drive motor of the first slide can drive both slides together to the tool change station via a lead screw. Through mechanical insertion, the two slides are rigidly connected into a whole during tool change, eliminating the relative positional error between the two independent moving parts and ensuring the accuracy of the docking between the tool change mechanism and the cutting mechanism.

[0022] Preferably, the driving component includes a giant gear ring, several pinions, and a third motor. The giant gear ring is coaxial and fixedly connected to the rotating drum. The several pinions are rotatably connected to the first slide, and the several pinions are meshed with the giant gear ring. The several pinions are evenly distributed along the circumference of the rotating drum. The third motor is fixedly connected to the first slide and is used to drive the rotation of any one of the pinions.

[0023] By adopting the above technical solution, the third motor starts and drives a small gear to rotate. This small gear drives the giant gear ring that meshes with it to rotate. Because the giant gear ring is coaxially fixed with the rotating drum, it in turn drives the rotating drum to rotate, performing circumferential cutting on the square tube. Multiple evenly distributed small gears meshing with the giant gear ring can distribute the force, reduce wear compared to single gear transmission, and extend the service life of the components. At the same time, the gear transmission has high transmission efficiency and precise angle control, which can ensure the accuracy of saw blade angle adjustment.

[0024] Preferably, the driving component further includes a double-ended screw and a fourth motor. There are two spindle boxes, which are simultaneously slidably connected inside the rotating drum along a direction perpendicular to the axis of the rotating drum, and the sliding directions of the two spindle boxes are opposite to each other. The two ends of the double-ended screw are respectively threaded through and connected to the two spindle boxes. The fourth motor is mounted on the rotating drum and is used to drive the rotation of the double-ended screw.

[0025] By adopting the above technical solution, the fourth motor on the rotary drum drives the double-ended screw to rotate. Because the threads at both ends of the double-ended screw are connected to the two spindle boxes, and the sliding directions of the two spindle boxes are opposite, the rotation of the screw causes the two spindle boxes to synchronously move closer or further apart, thereby adjusting the distance between the two saw blades. The synchronous drive of the two spindle boxes by the double-ended screw ensures that the moving distance of the two spindle boxes is consistent, the distance adjustment is precise, and the synchronization is strong, avoiding errors from manual adjustment. Simultaneously, the position adjustment of both saw blades can be completed in one operation, resulting in higher efficiency in circumferential cutting of square tubes.

[0026] The main technical effects of this invention are reflected in the following aspects: 1. The first slide table supporting the cutting mechanism and the second slide table supporting the tool changing mechanism of this invention feature independent drive and switching linkage design for the two slide tables. Their sliding directions are parallel, ensuring stability during cutting operations while enabling tool changing through linkage, thus improving equipment integration. The cutting mechanism is modular, consisting of a combination of a rotary drum, dual spindle boxes, and a tool holder, allowing for simultaneous cutting of different specifications of suitable square tubes with dual saw blades. The saw blades are detachable, providing a structural basis for rapid tool changing. The tool changing mechanism facilitates saw blade disassembly and installation, replacing manual tool changing, reducing labor costs, minimizing the possibility of interrupting continuous production, and improving production line automation and efficiency. 2. In this invention, when the pneumatic gripper installs the tool holder onto the rotary drum, the drive ring on the output shaft of the spindle box synchronously approaches the tool holder; the mating groove on the drive ring automatically aligns and engages with the tapered mating block on the tool holder; during cutting, the spindle box drives the drive ring to rotate, and through the engagement of the mating groove and the inclined surface of the mating block, the torque is efficiently and smoothly transmitted to the tool holder and saw blade; the connection of the power transmission mechanism is completed during the tool holder installation process, without the need for additional steps, further accelerating the tool changing speed; the engagement of multiple tapered blocks with the groove can transmit a large torque, and the connection rigidity is good; the tapered inclined surface has a guiding effect during engagement and can tolerate small axial position errors, improving the fault tolerance and success rate of docking; 3. In this invention, when the tool holder is removed from the rotary drum by the pneumatic gripper and the tool handle is disengaged from the spindle box, the two sliding seats are automatically driven to their respective extreme end positions along the length of the tool holder under the action of their springs. At this time, the position of the tool handle relative to the tool holder is fixed and known. When the tool holder with a new saw blade is reinstalled into the rotary drum by the pneumatic gripper, since the two tool handles have been pre-positioned at the determined ends by the springs, their axial and radial relative positions with the output shaft of the spindle box are highly predictable. This greatly simplifies the docking process, and the mating groove of the drive ring can smoothly engage with the mating block on the tool handle. This ensures that each time the tool holder is processed as an independent module by the tool changing mechanism, its internal tool handle is in a uniform and standard initial state. This eliminates installation errors caused by different cutting positions in the previous operation, enabling the power docking of the tool holder and the spindle box to be completed quickly, accurately, and reliably each time. The control system does not require additional sensors and complex algorithms to calibrate the position of the internal tool handle of the tool holder, reducing system complexity. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the rack structure according to an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the first slide structure in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the second slide structure in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the tool changing mechanism in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the plug-in post structure in an embodiment of this application.

[0033] Figure 7 This is a schematic diagram of the tool holder structure according to an embodiment of this application.

[0034] Figure 8 This is a schematic diagram of the cutting mechanism structure according to an embodiment of this application.

[0035] Figure 9 This is a schematic diagram of the rotating drum structure according to an embodiment of this application.

[0036] Figure 10 It is along Figure 9 Enlarged view of point A in the middle.

[0037] Figure 11 This is a schematic diagram of the tool holder structure according to an embodiment of this application.

[0038] Figure 12 This is a schematic diagram of the sliding seat structure according to an embodiment of this application.

[0039] Figure 13 This is a schematic diagram of the tool holder structure according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Frame; 2. First slide; 3. Second slide; 4. Cutting mechanism; 5. Tool changing mechanism; 6. Drive mechanism; 7. Lead screw; 8. Insertion post; 81. Insertion hole; 9. Controller; 10. Hydraulic cylinder; 11. Rotary drum; 12. Spindle box; 13. Tool holder; 14. Drive component; 15. Tool holder; 16. Saw blade; 17. Giant gear ring; 18. Pinion gear; 19. Third motor; 20. Limiting assembly; 201. Limiting rotating post; 202. Mounting base; 22. Pneumatic gripper; 23. Tool mounting post; 24. Tool dismounting post; 25. Drive assembly; 26. ... 27. Electric cylinder 1; 28. Electric cylinder 29. Moving seat; 30. First lead screw; 31. First motor; 32. Second lead screw; 33. Second motor; 34. Embedded groove; 35. Pneumatic pressure block; 36. Through groove; 37. Tool gripper; 38. First top block; 39. Limiting block; 40. Second top block; 41. Tool drop groove; 42. Guide post; 43. Guide slide rail; 44. Mating block; 45. Drive ring; 46. Mating groove; 47. Spring; 48. Sliding seat; 49. Guide rod; 50. Limiting pin; 51. First limiting hole; 52. Second limiting hole; 53. Limiting spring. Detailed Implementation

[0041] The following is in conjunction with the appendix Figures 1-13 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0042] This application discloses a cutting device for a square tube forming production line.

[0043] Reference Figure 1 and Figure 2 The cutting equipment for a square tube forming production line according to this embodiment includes a frame 1, a first slide 2, a second slide 3, a cutting mechanism 4, a tool changing mechanism 5, and a driving mechanism 6. The first slide 2 and the second slide 3 are slidably connected to the frame 1, and the sliding directions of the first slide 2 and the second slide 3 are parallel. The driving mechanism 6 is used to drive the sliding of the first slide 2 and the second slide 3 respectively.

[0044] Reference Figure 1 and Figure 2 The drive mechanism 6 includes a lead screw 7 and a plug 8. The lead screw 7 is rotatably connected to the frame 1 and threadedly connected to the first slide 2. A drive motor is installed on the frame 1 to drive the rotation of the lead screw 7. The plug 8 is slidably connected to the second slide 3 along a sliding direction perpendicular to the second slide 3. The first slide 2 has a plug hole 81 that can be plugged into the plug 8. A hydraulic cylinder 10 is installed on the second slide 3 to drive the sliding of the plug 8. When the second slide 3 needs to slide, the plug 8 is plugged into the plug hole 81.

[0045] Reference Figure 1 and Figure 2 When driving the first slide 2, the drive motor on the first slide 2 drives the lead screw 7 to rotate. The lead screw 7 engages with the first slide 2 via a thread, thereby driving the first slide 2 to slide along the frame 1. When the second slide 3 needs to be driven, the first slide 2 slides to the side of the second slide 3, and the hydraulic cylinder 10 on the second slide 3 drives the insertion pin 8 to slide, inserting it into the insertion hole 81 of the first slide 2. At this time, the sliding of the first slide 2 can drive the second slide 3 to slide synchronously, without the need for a complex drive structure for the second slide 3. The linkage of the two slides is achieved through the insertion engagement, which simplifies the drive structure of the second slide 3 and reduces the manufacturing cost of the equipment. At the same time, the lead screw 7 ensures the sliding accuracy of the first slide 2, and the hydraulic cylinder 10 drives the insertion pin 8 with fast response, making the connection and separation operations during linkage convenient. It provides power support for the precise docking and linkage movement of the two slides during tool changing, ensuring the positional accuracy during tool changing.

[0046] Reference Figure 8 and Figure 9The cutting mechanism 4 includes a rotating drum 11, two spindle boxes 12, a tool holder 13, and a drive unit 14. The rotating drum 11 is rotatably connected to the first slide table 2. The two spindle boxes 12 are slidably connected inside the rotating drum 11. The tool holder 13 is detachably connected to the rotating drum 11. Two tool handles 15 are movably connected to the tool holder 13. The two tool handles 15 correspond to the two spindle boxes 12 respectively. Saw blades 16 are installed on the two tool handles 15 respectively. The drive unit 14 is used to drive the rotation of the rotating drum 11 and the movement of the spindle boxes 12 respectively.

[0047] Reference Figure 8 and Figure 9 The driving component 14 includes a giant gear ring 17, several pinions 18, and a third motor 19. The giant gear ring 17 is coaxial and fixedly connected to the rotating drum 11. The several pinions 18 are rotatably connected to the first slide table 2 and mesh with the giant gear ring 17. The several pinions 18 are evenly distributed along the circumference of the rotating drum 11. The third motor 19 is fixedly connected to the first slide table 2 and is used to drive the rotation of any pinion 18.

[0048] Reference Figure 8 and Figure 9 The third motor 19 starts and drives a small gear 18 to rotate. This small gear 18 drives the giant gear ring 17, which meshes with it, to rotate. Because the giant gear ring 17 is coaxially fixed with the rotating drum 11, it in turn drives the rotating drum 11 to rotate, thus performing circumferential cutting on the square tube. The multiple evenly distributed small gears 18 meshing with the giant gear ring 17 can distribute the force, reduce wear compared to single gear transmission, and extend the service life of the components. At the same time, the gear transmission has high transmission efficiency and precise angle control, which can ensure the accuracy of the saw blade 16 angle adjustment.

[0049] Reference Figure 8 and Figure 9 The drive unit 14 also includes a double-ended screw and a fourth motor. There are two spindle boxes 12. The two spindle boxes 12 are slidably connected inside the rotating drum 11 along the axis perpendicular to the axis of the rotating drum 11, and the sliding directions of the two spindle boxes 12 are opposite to each other. The two ends of the double-ended screw are respectively threaded through and connected to the two spindle boxes 12. The fourth motor is installed on the rotating drum 11 and is used to drive the rotation of the double-ended screw.

[0050] Reference Figure 8 and Figure 9The fourth motor on the rotary drum 11 drives the double-ended screw to rotate. Since the threads at both ends of the double-ended screw are connected to the two spindle boxes 12, and the sliding directions of the two spindle boxes 12 are opposite, the rotation of the lead screw 7 causes the two spindle boxes 12 to move synchronously closer or further apart, thereby adjusting the distance between the two saw blades 16. The synchronous drive of the double-ended screw to the two spindle boxes 12 ensures that the moving distance of the two spindle boxes 12 is consistent, the distance adjustment is precise, and the synchronization is strong, avoiding errors from manual adjustment. Simultaneously, the position adjustment of the two saw blades 16 can be completed in one operation, resulting in higher efficiency in circumferential cutting of the tube.

[0051] Reference Figure 1 and Figure 2 The first slide 2 is also equipped with several limiting components 20. Each limiting component 20 includes a mounting base 202 and two limiting rotating posts 201. The mounting base 202 has a through groove 35 for the square tube to pass through. The two limiting rotating posts 201 are rotatably connected within each limiting rotating post 201. Sliding blocks are mounted on each of the two limiting rotating posts 201, and the two sliding blocks are slidably connected within the mounting base 202 with their sliding directions opposite each other. A double-ended screw is rotatably connected within the mounting base 202, with both ends of the double-ended screw passing through and threadedly connected to the sliding blocks of the two limiting rotating posts 201. A motor is mounted on the mounting base 202 to drive the rotation of the double-ended screw and adjust the distance between the two limiting rotating posts 201. The rotation axes of the limiting rotating posts 201 within the several limiting components 20 are in different directions.

[0052] Reference Figure 13 Two sliding seats 48 are slidably connected to the tool holder 13. The tool handle 15 is rotatably connected to the sliding seats 48. Several limiting blocks 38 are slidably connected to the tool handle 15 along a direction perpendicular to the axis of the tool handle 15. A guide post 42 is slidably connected to the tool handle 15 along its circumference. A guide rail 43 is provided around the guide post 42. One end of each of the limiting blocks 38 is slidably connected to the guide rail 43 along the axis of the guide post 42. A first limiting hole 51 and a second limiting hole 52 are also provided on the circumferential side of the guide post 42. Inside the tool handle 15, along a direction perpendicular to the axis of the guide post 42, there are several limiting blocks 38 that can be slidably connected to the first limiting hole 51 and a second limiting hole 52 respectively. A limiting pin 50, which cooperates with a limiting hole 51 and a second limiting hole 52, is installed inside the handle 15. A limiting spring 53 drives the limiting pin 50 to move toward the guide post 42. When the guide post 42 moves to the unlocked or locked state of the handle 15 on the saw blade 16, the limiting pin 50 cooperates with the first limiting hole 51 or the second limiting hole 52 respectively. When the limiting block 38 slides toward the saw blade 16, several limiting blocks 38 slide toward the axis of the guide post 42 to unlock the saw blade 16. When the limiting block 38 slides toward the side away from the saw blade 16, several limiting blocks 38 slide toward the side away from the axis of the guide post 42.

[0053] Reference Figure 8 and Figure 9When installing the saw blade 16, the guide post 42 is pushed to move axially, and the guide rail 43 on it forces the limiting block 38 to engage with the recess or end face of the center hole of the saw blade 16 in a direction away from the axis of the guide post 42, thereby locking the saw blade 16. When removing the saw blade 16, the guide post 42 is pulled in the opposite direction, and the guide rail 43 causes the limiting block 38 to retract in the direction of the axis of the guide post 42, thereby releasing the locking of the saw blade 16, and the saw blade 16 can be removed. The synchronous opening and closing of multiple radial limiting blocks 38 can be achieved through a single axial linear motion, and the action is fast and reliable. The locking force comes from the mechanical structure, and there is no need to arrange electric or pneumatic components on the high-speed rotating tool holder 15. The structure is simple and stable and suitable for high-speed rotation conditions. Multiple circumferentially distributed limiting blocks 38 can provide uniform clamping force and good centering effect, ensuring the installation accuracy of the saw blade 16 and the rigidity during cutting.

[0054] Reference Figure 10 and Figure 12 Multiple mating blocks 44 are fixedly connected to the side of the tool holder 15 away from the limiting block 38. The multiple mating blocks 44 are arranged in a gradually decreasing shape from the side close to the tool holder 15 to the side away from the tool holder 15. The multiple mating blocks 44 are evenly distributed around the circumference of the tool holder 15. One end of the output shaft of the spindle box 12 is coaxially and fixedly connected to a drive ring 45. The drive ring 45 is provided with multiple mating grooves 46 that can mate with the mating blocks 44. When the tool holder 13 is installed on the rotary drum 11, the mating grooves 46 on the corresponding drive ring 45 mate with the mating blocks 44 on the corresponding tool holder 15.

[0055] Reference Figure 10 and Figure 12 When the pneumatic gripper 22 installs the tool holder 13 onto the rotary drum 11, the drive ring 45 on the output shaft of the spindle box 12 synchronously approaches the tool holder 15; the mating groove 46 on the drive ring 45 automatically aligns and engages with the tapered mating block 44 on the tool holder 15; during cutting, the spindle box 12 drives the drive ring 45 to rotate, and through the engagement of the mating groove 46 with the inclined surface of the mating block 44, the torque is efficiently and smoothly transmitted to the tool holder 15 and the saw blade 16; the connection of the power transmission mechanism is completed during the installation process of the tool holder 13, without the need for additional steps, further accelerating the tool changing speed; the engagement of multiple tapered blocks with the groove can transmit a large torque and has good connection rigidity; the tapered inclined surface has a guiding effect during engagement and can tolerate small axial position errors, improving the fault tolerance and success rate of docking.

[0056] Reference Figure 11 and Figure 12Two sets of guide rods 49 are fixedly connected to the tool holder 13. The two sets of guide rods 49 correspond to two sliding seats 48 respectively. Each set of guide rods 49 includes several guide rods 49. The several guide rods 49 pass through the corresponding sliding seats 48 and make the corresponding sliding seats 48 slide on the guide rods 49. Springs 47 are respectively sleeved on the several guide rods 49. The two ends of the several springs 47 abut against the corresponding sliding seats 48 and the tool holder 13 respectively. The several springs 47 always drive the corresponding sliding seats 48 to slide towards one side of the length direction of the tool holder 13, and the sliding directions of the two sliding seats 48 are set opposite to each other.

[0057] Reference Figure 11 and Figure 12 When the tool holder 13 is removed from the rotary drum 11 by the pneumatic gripper 22 and the tool handle 15 is disengaged from the spindle box 12, the two sliding seats 48 are automatically driven to their respective extreme end positions along the length of the tool holder 13 under the action of their springs 47. At this time, the position of the tool handle 15 relative to the tool holder 13 is fixed and known. When the tool holder 13 with the new saw blade 16 is reinstalled into the rotary drum 11 by the pneumatic gripper 22, since the two tool handles 15 have been pre-positioned at the determined ends by the springs 47, their axial and radial relative positions with the output shaft of the spindle box 12 are highly predictable. This greatly simplifies the docking process, and the mating groove 46 of the drive ring 45 can engage very smoothly with the mating block 44 on the tool handle 15. This ensures that each time the tool holder 13 is processed as an independent module by the tool changing mechanism 5, its internal tool handle 15 is in a uniform and standard initial state. This eliminates installation errors caused by different cutting positions in the previous operation, enabling the power docking between the tool holder 13 and the spindle box 12 to be completed quickly, accurately, and reliably every time. The control system does not require additional sensors and complex algorithms to calibrate the position of the tool holder 15 inside the tool holder 13, thus reducing system complexity.

[0058] Reference Figure 5 and Figure 6 The tool changing mechanism 5 is used to replace the saw blade 16 on the tool holder 13. The tool changing mechanism 5 includes a pneumatic gripper 22, a tool mounting frame 23, a tool dismounting frame 24, and a drive assembly 25. The pneumatic gripper 22 is movably connected to the second slide table 3 and is used to remove the tool holder 13 from the rotating drum 11. The tool mounting frame 23 and the tool dismounting frame 24 are slidably connected to the second slide table 3. The tool dismounting frame 24 is used to remove the saw blade 16 from the tool handle 15, and the tool mounting frame 23 is used to install the saw blade 16 onto the tool holder 13. The drive assembly 25 is used to drive the movement of the pneumatic gripper 22, the tool dismounting frame 24, and the tool mounting frame 23 respectively.

[0059] Reference Figure 3 and Figure 4When the tool holder 15 on the spindle box 12 needs to be replaced, the drive mechanism 6 drives the first slide 2 and the second slide 3 to move to an adjacent position and move together. The drive assembly 25 drives the pneumatic gripper 22 to drive the tool holder 13 in the rotary drum 11. The tool removal holder 24 moves to unlock the tool holder 15 so that the saw blade 16 falls off and into the tool slot 40 opened on the second slide 3. The tool mounting holder 23 mounts the new saw blade 16 onto the tool holder 15.

[0060] Reference Figure 5 and Figure 6 The drive assembly 25 includes a first electric cylinder 26, a second electric cylinder 27, and a moving base 28. The first electric cylinder 26 is mounted on the second slide table 3 and is used to drive the sliding of the tool holder 23. The second electric cylinder 27 is mounted on the second slide table 3 and is used to drive the sliding of the tool removal holder 24. The sliding base 48 is slidably connected to the second slide table 3, and the pneumatic gripper 22 is slidably connected to the sliding base 48. One end of the sliding base 48 can be moved into the rotating drum 11. A first lead screw 29 is rotatably connected to the second slide table 3 and is threaded onto the sliding base 48. A first motor 30 is mounted on the second slide table 3 and is used to drive the rotation of the first lead screw 29. A second lead screw 31 is rotatably connected to the sliding base 48 and is threaded onto the pneumatic gripper 22. A second motor 32 is mounted on the sliding base 48 and is used to drive the rotation of the second lead screw 31.

[0061] Reference Figure 5 and Figure 6 The first motor 30 drives the first lead screw 29, which moves the entire movable seat 28 along the second slide table 3, achieving coarse positioning of the tool changing mechanism 5 and the rotating drum 11. The second motor 32 drives the second lead screw 31 to finely adjust the position of the pneumatic gripper 22 on the movable seat 28, allowing it to precisely extend into the rotating drum 11 and grab the tool holder 13. The first electric cylinder 26 and the second electric cylinder 27 respectively drive the tool mounting holder 23 and the tool dismounting holder 24 to extend or retract independently, performing the specific actions of disassembling and mounting the saw blade 16. The tool changing action is decomposed into multiple linear movements, controlled separately by the lead screw 7 and the electric cylinders, ensuring the accuracy and reliability of each action step.

[0062] Reference Figure 8 and Figure 9 The rotating drum 11 is provided with an embedding groove 33. When the tool holder 13 moves into the rotating drum 11, the tool holder 13 is located in the embedding groove 33. The rotating drum 11 is provided with a number of pneumatic pressure blocks 34. The number of pneumatic pressure blocks 34 can be moved to limit the tool holder 13 in the rotating drum 11. A through groove 35 is provided on the circumferential side of the rotating drum 11. One end of the sliding seat 48 can be inserted into the through groove 35.

[0063] Reference Figure 6 and Figure 8When the pneumatic gripper 22 loads the tool holder 13 into the rotary drum 11, the tool holder 13 is positioned within the insertion slot 33. The insertion slot 33 provides initial precise radial and circumferential positioning for the tool holder 13, ensuring that the tool holder 13 does not tilt and that the mating block 44 on the tool holder 15 is approximately aligned with the mating slot 46 of the drive ring 45 of the spindle box 12. After the tool holder 13 is in place, several pneumatic clamping blocks 34 inside the rotary drum 11 firmly fix the tool holder 13 in the insertion slot 33. The design of the through slot 35 allows the tool changing mechanism 5 to directly contact the tool holder 13.

[0064] Reference Figure 7 The tool holder 23 is equipped with a tool clamp 36 and a first top block 37. The tool clamp 36 is used to clamp the saw blade 16. When the tool clamp 36 clamps the saw blade 16, the first top block 37 is coaxially arranged with the saw blade 16. When the tool holder 23 slides toward the pneumatic clamp 22, the first top block 37 can abut against the limiting block 38 of the tool holder 15. The tool removal holder 24 is provided with a second top block 39. When the tool removal holder 24 slides toward the pneumatic clamp 22, the second top block 39 can abut against the limiting block 38 of the tool holder 15.

[0065] Reference Figure 5 and Figure 6 The saw blade holder 24 moves toward the saw blade holder 13, where the second top block 39 precisely abuts against the end of the guide post 42 and continues to advance, pushing the guide post 42 in the unlocking direction to unlock the saw blade 16. The saw blade mounting holder 23 moves toward the saw blade holder 13, where the tool gripper 36 first positions the new saw blade 16 on the handle 15. Then, the first top block 37 abuts against the end of the guide post 42 and pushes it in the locking direction, causing the limiting block 38 to expand and lock the new saw blade 16. The saw blade removal and mounting functions are assigned to two independent components, each performing only one core action, resulting in a simple mechanism and low failure rate. The saw blade mounting holder 23 integrates the functions of clamping the saw blade 16 and pushing the locking mechanism, completing the placement and fixing of the saw blade 16 in a single operation.

[0066] Reference Figure 3 and Figure 4 It also includes a controller 9 and multiple sensors electrically connected to the controller 9. The controller 9 is mounted on the second slide 3, and is preferably a programmable logic controller 9. Its input and output modules are respectively connected to the control valves of the drive motor, hydraulic cylinder 10, electric cylinders, pneumatic gripper 22, and pneumatic pressure block 34 in the drive mechanism 6, cutting mechanism 4, and tool changing mechanism 5. The controller 9 is configured to receive signals from each sensor and, according to a preset program or external production instructions, coordinate and control the start, stop, sequence, speed, and position of each actuator to achieve a fully automatic cutting cycle and tool changing process.

[0067] Reference Figure 1 and Figure 2The sensors include a docking sensor, a position and angle sensing unit, and a tool changing process detection sensor. The docking sensor is located next to the insertion hole 81 of the first slide 2 and is specifically a small proximity switch. When the insertion post 8 on the second slide 3 is fully inserted into the insertion hole 81 under the drive of the hydraulic cylinder 10, the proximity switch is triggered, generating a high-level signal and sending it to the controller 9. The controller 9 only allows the execution of subsequent dual-slide linkage movement commands after receiving this confirmation signal, thereby ensuring that the two slides are reliably connected as a whole mechanically, providing a stable position reference for the precise intervention of the tool changing mechanism 5.

[0068] Reference Figure 1 and Figure 2 The position and angle sensing unit includes a slide table position encoder and a rotary drum 11 angle encoder. The slide table position encoder is coaxially connected to the drive motor of the first slide table 2, and is used to detect the number of rotations and angle of the drive motor in real time and accurately, and then convert it into the linear displacement of the first slide table 2 through the pitch of the lead screw 7. The controller 9 compares the feedback value of this encoder with the target position to realize closed-loop control and precise positioning of the movement of the first slide table 2, ensuring that it can achieve the preset coordinate accuracy whether it moves to different cutting positions on the production line or to the docking position with the second slide table 3. The rotary drum 11 angle encoder is directly coaxially installed with the rotating spindle of the rotary drum 11, and is used to detect the absolute rotation angle of the rotary drum 11 in real time. According to the cutting process requirements, the controller 9, combined with the real-time feedback of the encoder, precisely controls the start and stop of the third motor 19, so that the rotary drum 11 drives the saw blade 16 to rotate quickly and accurately to the target angle. It is the core feedback element for realizing the multi-angle circumferential cutting function.

[0069] Reference Figure 3 and Figure 4 The sensor system for detecting tool changes includes a gripper clamping detection sensor and a tool holder 13 tool position status sensor. Two sets of tool holder 15 positioning sensors are provided. The gripper clamping detection sensor is a pressure sensor or miniature limit switch integrated inside the fingers of the pneumatic gripper 22. When the pneumatic gripper 22 closes and reaches the preset clamping force or closing stroke, the sensor sends an confirmation signal to the controller 9, proving that the tool holder 13 has been reliably gripped, preventing it from falling off during transport. The tool holder 13 tool position status sensor is a through-beam photoelectric sensor. Its transmitter and receiver are respectively installed on both sides of each tool holder 15 storage position on the tool holder 13. When a saw blade 16 is placed in that position, the beam is blocked, and the controller 9 determines that the position is "occupied," thereby managing the usage sequence and lifespan of multiple sets of tools.

[0070] Reference Figure 1 and Figure 2In automatic operation mode, the controller 9, based on received production instructions such as cutting length, quantity, angle, or internal tool life count, first drives the first slide 2, carrying the cutting mechanism 4, to precisely move to the cutting station according to feedback from the slide position encoder. During the cutting process, the controller 9 can read the angle encoder data of the drum 11 in real time to ensure a constant angle. When the tool change trigger condition is met, the controller 9 starts the automatic tool change program: controlling the first slide 2 and the second slide 3 to move to the docking coordinates respectively. After receiving the positioning signal from the docking sensor, the controller controls the drive motor to move the two slides together to the tool change area. Subsequently, the controller 9 controls the drum 11 to rotate according to the feedback from the angle encoder of the drum 11, so that the through slot 35 is aligned with the tool change mechanism 5. Afterwards, the controller 9 strictly follows the sequential logic, controlling the first motor 30 and the second motor 32 to drive the moving seat 28 and the pneumatic gripper 22 for precise positioning. Only after receiving the gripper clamping detection signal does the controller 9 instruct the pneumatic gripper 22 to perform the gripping action. After the tool holder 13 is removed, the controller 9, based on the signal from the tool position status sensor of the tool holder 13, coordinates the first electric cylinder 26 and the second electric cylinder 27 to drive the tool removal holder 24 and the tool installation holder 23 to complete the removal of the old tool and the installation of the new tool. Each key action requires confirmation signals from the corresponding sensor before proceeding to the next step, forming a closed-loop control. After the tool change is completed, the controller 9 instructs the pneumatic gripper 22 to reinstall the tool holder 13, and confirms the installation is in place through the tool holder 15 positioning sensor. Finally, it controls all mechanisms to reset, the double slides separate, and the equipment returns to the cutting process.

[0071] Reference Figure 1 and Figure 2 In summary, the tool changing process of this equipment is as follows: S1, Dual-slide linkage docking: The drive motor drives the first slide 2 to slide to the linkage position next to the second slide 3; the hydraulic cylinder 10 of the second slide 3 is activated, driving the plug-in post 8 to extend and insert into the plug-in hole 81 of the first slide 2, completing the mechanical connection between the two slides. S2. Unlocking and Removing the Tool Holder 13: The pneumatic pressure block 34 inside the rotating drum 11 disengages from the tool holder 13, releasing the limiting and fixing of the tool holder 13; the first motor 30 of the tool changing mechanism 5 starts, driving the first lead screw 29 to rotate, causing the moving seat 28 to slide along the second slide table 3, so that the pneumatic gripper 22 moves to the outside of the through groove 35 of the rotating drum 11, completing the coarse positioning; then the second motor 32 starts, driving the second lead screw 31 to rotate, finely adjusting the position of the pneumatic gripper 22, so that it extends into the rotating drum 11 and clamps the tool holder 13; after the pneumatic gripper 22 clamps the tool holder 13, the moving seat 28 moves in the opposite direction, removing the tool holder 13 from the embedded groove 33 of the rotating drum 11 and moving it to the tool changing position of the second slide table 3; S3. Disassembly of old saw blade 16: The second electric cylinder 27 is started, driving the blade removal holder 24 to slide towards the blade holder 13. The second top block 39 on the blade removal holder 24 abuts against the limiting block 38 of the handle 15 and pushes in the unlocking direction to complete the unlocking action of the saw blade 16, so that the old saw blade 16 falls off the handle 15 into the inclined blade groove 40 on the first slide table 2, thus completing the disassembly. S4. Installation of the new saw blade 16: The first electric cylinder 26 is activated, driving the tool holder 23 to slide towards the tool holder 13; the tool clamp 36 on the tool holder 23 clamps the new saw blade 16 and precisely positions it on the tool holder 15; the first top block 37 on the tool holder 23 is coaxially set with the saw blade 16, and moves with the tool holder 23 to abut against the limiting block 38 on the tool holder 15, and pushes in the locking direction to expand the limiting block 38, locking the new saw blade 16 onto the tool holder 15; the tool clamp 36 is released, completing the installation of the new saw blade 16. S5. Tool holder 13 resets and separates from slide: Pneumatic gripper 22 clamps the tool holder 13 with the new saw blade 16 installed, and moving seat 28 moves the tool holder 13 to the embedding groove 33 of the rotating drum 11, placing the tool holder 13 into the embedding groove 33; pneumatic pressure block 34 in the rotating drum 11 extends out, firmly limiting and fixing the tool holder 13 in the embedding groove 33, and pneumatic gripper 22 releases and exits the rotating drum 11; the hydraulic cylinder 10 of the second slide 3 drives the plug-in column 8 to retract, disconnecting it from the first slide 2; the drive motor drives the first slide 2 to slide back to the cutting position, and the second slide 3 remains in the initial position, waiting for the next tool change command.

[0072] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A cutting device for a square tube forming production line, characterized in that: The machine includes a frame (1), a first slide (2), a second slide (3), a cutting mechanism (4), a tool changing mechanism (5), and a driving mechanism (6). The first slide (2) and the second slide (3) are slidably connected to the frame (1), and the sliding directions of the first slide (2) and the second slide (3) are parallel. The driving mechanism (6) is used to drive the sliding of the first slide (2) and the second slide (3) respectively. The cutting mechanism (4) includes a rotating drum (11), two spindle boxes (12), a tool holder (13), and a driving component (14). The rotating drum (11) is rotatably connected to the first slide (2). The two spindle boxes (12) are slidably connected inside the rotating drum (11). The tool holder (13) is detachably connected to the rotating drum (11). Two tool handles (15) are movably connected to the tool holder (13). The two tool handles (15) correspond to the two spindle boxes (12) respectively. Saw blades (16) are installed on the two tool handles (15). The driving component (14) is used to drive the rotation of the rotating drum (11) and the movement of the spindle boxes (12) respectively. The tool changing mechanism (5) is used to replace the saw blade (16) on the tool holder (13). The tool changing mechanism (5) includes a pneumatic gripper (22), a tool mounting frame (23), a tool dismounting frame (24), and a drive assembly (25). The pneumatic gripper (22) is movably connected to the second slide (3). The pneumatic gripper (22) is used to remove the tool holder (13) from the rotating drum (11). The tool mounting frame (23) and the tool dismounting frame (24) are slidably connected to the second slide (3). The tool dismounting frame (24) is used to remove the saw blade (16) from the handle (15). The tool mounting frame (23) is used to install the saw blade (16) onto the tool holder (13). The drive assembly (25) is used to drive the movement of the pneumatic gripper (22), the tool dismounting frame (24), and the tool mounting frame (23) respectively. When the tool holder (15) on the spindle box (12) needs to be replaced, the drive mechanism (6) drives the first slide (2) and the second slide (3) to move to the adjacent position and move together. The drive assembly (25) drives the pneumatic gripper (22) to clamp and move the tool holder (13) in the rotating drum (11). The tool removal holder (24) moves to unlock the tool holder (15) so that the saw blade (16) falls off. The tool mounting holder (23) mounts the new saw blade (16) onto the tool holder (15).

2. The cutting equipment for a square tube forming production line according to claim 1, characterized in that: Two sliding seats (48) are slidably connected to the tool holder (13). The tool handle (15) is rotatably connected to the sliding seats (48). Several limiting blocks (38) are slidably connected to the tool handle (15) along the direction perpendicular to the axis of the tool handle (15). A guide post (42) is slidably connected to the tool handle (15) along its circumference. A guide rail (43) is provided around the guide post (42). One end of several limiting blocks (38) is slidably connected to the guide rail (43) along the axis of the guide post (42). When the limiting block (38) slides toward the saw blade (16), the several limiting blocks (38) slide toward the axis of the guide post (42) to unlock the saw blade (16). When the limiting block (38) slides toward the side away from the saw blade (16), the several limiting blocks (38) slide toward the side away from the axis of the guide post (42).

3. The cutting equipment for a square tube forming production line according to claim 2, characterized in that: The tool holder (15) has multiple mating blocks (44) on the side away from the limiting block (38). The multiple mating blocks (44) are arranged in a gradually decreasing shape from the side close to the tool holder (15) to the side away from the tool holder (15). The multiple mating blocks (44) are evenly distributed around the circumference of the tool holder (15). One end of the output shaft of the spindle box (12) is coaxially and fixedly connected to a drive ring (45). The drive ring (45) has multiple mating grooves (46) that can mate with the mating blocks (44). When the tool holder (13) is installed on the rotating drum (11), the mating grooves (46) on the corresponding drive ring (45) mate with the mating blocks (44) on the corresponding tool holder (15).

4. The cutting equipment for a square tube forming production line according to claim 2, characterized in that: The tool holder (13) is provided with two sets of guide rods (49), and the two sets of guide rods (49) correspond to two sliding seats (48) respectively. Each set of guide rods (49) includes several guide rods (49). The several guide rods (49) pass through the corresponding sliding seats (48) and make the corresponding sliding seats (48) slide on the guide rods (49). The several guide rods (49) are respectively fitted with springs (47). The two ends of the several springs (47) abut against the corresponding sliding seats (48) and the tool holder (13) respectively. The several springs (47) always drive the corresponding sliding seats (48) to slide towards one side of the length direction of the tool holder (13), and the sliding directions of the two sliding seats (48) are set opposite to each other.

5. The cutting equipment for a square tube forming production line according to claim 2, characterized in that: The drive assembly (25) includes a first electric cylinder (26), a second electric cylinder (27), and a moving base (28). The first electric cylinder (26) is mounted on the second slide (3) and is used to drive the sliding of the tool holder (23). The second electric cylinder (27) is mounted on the second slide (3) and is used to drive the sliding of the tool removal holder (24). The sliding base (48) is slidably connected to the second slide (3), and the pneumatic gripper (22) is slidably connected to the sliding base (48). One end of the sliding base (48) is movable to the rotating drum (11). Inside, a first lead screw (29) is rotatably connected to the second slide (3). The first lead screw (29) passes through and is threadedly connected to the sliding seat (48). A first motor (30) is provided on the second slide (3). The first motor (30) is used to drive the rotation of the first lead screw (29). A second lead screw (31) is rotatably connected to the sliding seat (48). The second lead screw (31) passes through and is threadedly connected to the pneumatic gripper (22). A second motor (32) is provided on the sliding seat (48). The second motor (32) is used to drive the rotation of the second lead screw (31).

6. The cutting equipment for a square tube forming production line according to claim 5, characterized in that: The rotating drum (11) is provided with an embedding groove (33). When the tool holder (13) moves into the rotating drum (11), the tool holder (13) is located in the embedding groove (33). The rotating drum (11) is provided with a plurality of pneumatic pressure blocks (34). The plurality of pneumatic pressure blocks (34) can be moved to limit the tool holder (13) in the rotating drum (11). A through groove (35) is provided on the circumferential side of the rotating drum (11). One end of the sliding seat (48) can be inserted into the through groove (35).

7. The cutting equipment for a square tube forming production line according to claim 2, characterized in that: The tool holder (23) is provided with a tool clamp (36) and a first top block (37). The tool clamp (36) is used to clamp the saw blade (16). When the tool clamp (36) clamps the saw blade (16), the first top block (37) is coaxially arranged with the saw blade (16). When the tool holder (23) slides toward the pneumatic clamp (22), the first top block (37) can abut against the limiting block (38) of the handle (15). The tool removal holder (24) is provided with a second top block (39). When the tool removal holder (24) slides toward the pneumatic clamp (22), the second top block (39) can abut against the limiting block (38) of the handle (15).

8. The cutting equipment for a square tube forming production line according to claim 1, characterized in that: The drive mechanism (6) includes a lead screw (7) and a plug-in post (8). The lead screw (7) is rotatably connected to the frame (1). The lead screw (7) passes through and is threadedly connected to the first slide (2). The frame (1) is provided with a drive motor, which is used to drive the rotation of the lead screw (7). The plug-in post (8) is slidably connected to the second slide (3) along a sliding direction perpendicular to the second slide (3). The first slide (2) is provided with a plug-in hole (81) that can be plugged into the plug-in post (8). The second slide (3) is equipped with a hydraulic cylinder (10), which is used to drive the sliding of the plug-in post (8). When the second slide (3) needs to slide, the plug-in post (8) is plugged into the plug-in hole (81).

9. The cutting equipment for a square tube forming production line according to claim 1, characterized in that: The driving component (14) includes a giant gear ring (17), several pinions (18) and a third motor (19). The giant gear ring (17) is coaxial and fixedly connected to the rotating drum (11). Several pinions (18) are rotatably connected to the first slide (2). Several pinions (18) are meshed with the giant gear ring (17) and are evenly distributed along the circumference of the rotating drum (11). The third motor (19) is fixedly connected to the first slide (2) and is used to drive the rotation of any pinion (18).

10. The cutting equipment for a square tube forming production line according to claim 1, characterized in that: The drive unit (14) also includes a double-ended screw and a fourth motor. There are two spindle boxes (12). The two spindle boxes (12) are slidably connected in the rotating drum (11) along the axis perpendicular to the rotating drum (11), and the sliding directions of the two spindle boxes (12) are opposite to each other. The two ends of the double-ended screw are respectively threaded through and connected to the two spindle boxes (12). The fourth motor is installed on the rotating drum (11) and is used to drive the rotation of the double-ended screw.

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