High-precision pipe cutting machine

Abstract

The invention relates to the technical field of laser cutting, in particular to a high-precision pipe cutting machine which comprises a plurality of bases and a plurality of follow-up supporting assemblies, each follow-up supporting assembly comprises a lifting assembly, a supporting platform, a supporting unit and a clamping unit, and the supporting platform is arranged at the driving end of the lifting assembly; a supporting roller of the supporting unit is rotatably arranged on a supporting platform, the clamping unit comprises two clamping rollers and a clamping adjusting assembly, the two clamping rollers are rotatably arranged on the clamping adjusting assembly, and the clamping adjusting assembly is used for driving the two clamping rollers to be close to or away from each other. The supporting roller and the two clamping rollers jointly form a three-point supporting structure so as to allow the pipe to rotate in the circumferential direction and move in the axial direction. The lower supporting roller and the clamping rollers on the two sides jointly position the pipe, self-weight deflection is effectively counteracted, it is ensured that the pipe is always kept in the preset axis in the cutting process, cutting errors are reduced, and scratching is avoided due to rolling contact between the rollers and the pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser cutting, in particular to a high-precision pipe cutting machine. BACKGROUND

[0002] In the traditional laser cutting of long pipes, the long pipes will produce significant sag due to their own weight, especially between the two fixed chucks. This sag will change the distance between the cutting head and the pipe surface, affecting the cutting quality, and even causing collision. Although the traditional fixed support structure can lift the pipe, it will hinder the circumferential rotation and axial feeding of the pipe during cutting bevel, girth seam and other operations, and cannot adapt to complex cutting requirements. Some rigid supports directly slide in contact with the pipe, which is easy to scratch the pipe surface and damage the appearance and surface precision of the workpiece. SUMMARY

[0003] The technical problem to be solved by the present application is to solve at least one of the above technical problems.

[0004] The solution to the technical problem of the present application is a high-precision pipe cutting machine, which comprises a rack, a gantry arranged on the rack, a laser cutting assembly arranged on the gantry, and a first chuck assembly, a second chuck assembly and a third chuck assembly arranged in sequence and slidingly on the rack along the pipe feeding direction; further comprising a plurality of bases and a plurality of follow-up support assemblies, a plurality of the bases are arranged in sequence and spaced apart on the front side of the rack along the pipe feeding direction, and the follow-up support assemblies are arranged one by one on the bases. Each set of the follow-up support assemblies comprises a lifting assembly, a support platform, a support unit and a clamping unit. The lifting assembly is arranged on the base, the support platform is arranged on the driving end of the lifting assembly, the lifting assembly is used to drive the support platform to lift along the vertical direction, the support unit comprises a support roller, the support roller is arranged on the support platform and can rotate relative to the support platform, the rolling axis of the support roller is perpendicular to the pipe feeding direction, the clamping unit comprises two clamping rollers and a clamping adjusting assembly, the clamping adjusting assembly is arranged on the support platform, and the two clamping rollers are arranged on the clamping adjusting assembly and can rotate relative to the clamping adjusting assembly. The rolling axes of the two clamping rollers are perpendicular to the pipe feeding direction, the two clamping rollers jointly define a clamping space to limit the lateral position of the pipe, and the clamping adjusting assembly is used to adjust the lateral size of the clamping space. The support roller and the two clamping rollers jointly form a three-point supporting structure to allow the pipe to rotate circumferentially and move axially.

[0005] As a further improvement to the above technical solution, the lifting assembly includes a first motor, a first gear, a first slide rail, and a first rack. The first slide rail is vertically mounted on the base, and the support platform is slidably connected to the first slide rail. The first rack is mounted on the base and parallel to the first slide rail. The first motor is mounted on the support platform, and the first gear is coaxially rotatably mounted with the output end of the first motor. The first gear meshes with the first rack, and the first motor is used to drive the support platform to reciprocate along the first slide rail.

[0006] As a further improvement to the above technical solution, the lifting assembly also includes a first switch, a second switch, a sensing plate, and a positioning structure; the first switch is fixedly installed on the top of the base, the second switch is fixedly installed on the bottom of the base, the sensing plate is installed on the support platform through the positioning structure, and both the first switch and the second switch are electrically connected to the first motor. When the first motor drives the support platform to move to the limit position of the frame, the sensing plate triggers the first switch or the second switch, and the first motor stops running.

[0007] As a further improvement to the above technical solution, the positioning structure includes an L-shaped plate composed of a first plate and a second plate, a first bolt, and a second bolt; the first plate of the L-shaped plate is threadedly connected to the support platform by the first bolt, and the second plate of the L-shaped plate has two oblong holes, the second bolt is slidably inserted into the oblong holes, and the second bolt is threadedly connected to the sensing plate.

[0008] As a further improvement to the above technical solution, the first motor has an automatic brake-holding function in case of power failure.

[0009] As a further improvement to the above technical solution, the clamping adjustment assembly includes a second motor, a drive rod, a second slide rail, a third slide rail, two connecting rods, two clamping arms, and two first bearings. The second slide rail is vertically arranged on the support platform. The drive rod is slidably connected to the second slide rail. The third slide rail is arranged on the support platform and its extension direction is perpendicular to the tube feeding direction. The two clamping arms are slidably connected to the third slide rail respectively. One end of each connecting rod is hinged to a clamping arm, and the other end of each connecting rod is hinged to the center of the drive rod. The two first bearings are respectively arranged on the clamping arms. The two clamping rollers are rotatably connected to the clamping arms through the two first bearings respectively. The second motor is arranged on the support platform, and the output end of the second motor is fixedly connected to the drive rod.

[0010] As a further improvement of the above technical solution, the support unit further comprises two inner rods, two springs and two bearing seats, the inner rods are fixed on the support platform, the two bearing seats are respectively sleeved on the two inner rods, the two ends of the support roller are respectively arranged on the two bearing seats and can rotate relative to the bearing seats, the two springs are respectively sleeved on the two inner rods, one end of the two springs is respectively connected with the bottom of the two bearing seats, and the other end of the spring is connected with the support platform, and the spring has a tendency to push the bearing seat away from the support platform.

[0011] As a further improvement of the above technical solution, the outer surfaces of the support roller and the clamping roller are provided with anti-skid wear-resistant layers.

[0012] The beneficial effects of the present application are that the rack and the gantry provide basic support, the first, second and third chuck assemblies slide along the feeding direction to realize axial conveying of the pipe material, simultaneously drive the pipe material to rotate circumferentially, cooperate with the laser cutting assembly to complete cutting at different angles; the base provides a mounting reference for the follow-up support assembly; the lifting assembly drives the support platform to vertically lift and adjust the support height to adapt to the lifting needs of pipe materials of different diameters; the support unit lifts the pipe material from below, allows the pipe material to rotate circumferentially and slide axially with low friction, and bears the main vertical load of the pipe material; the two clamping rollers of the clamping unit limit the lateral position of the pipe material from both sides to prevent the pipe material from shifting left and right; the clamping adjusting assembly can adjust the distance between the two rollers to adapt to pipe materials of different diameters. The three-point supporting structure positions the pipe material from the lower support roller and the two clamping rollers on both sides, effectively offsets the deflection of the dead weight, ensures that the pipe material always maintains the preset axis during the cutting process, and reduces the cutting error; all support and clamping components are designed as rollers, which replace sliding friction with rolling friction, allowing the pipe material to rotate freely circumferentially to meet multi-angle cutting and realizing low-resistance axial feeding without affecting the machining action; the rolling contact between the roller and the pipe material greatly reduces surface friction and avoids scratching, especially for precision pipes with high surface requirements; the multiple follow-up support assemblies are arranged at intervals along the feeding direction and can be flexibly enabled according to the length of the pipe material to form segmented supporting and further suppress the vibration and deformation of long pipe materials. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0014] Figure 2 is Figure 1 is an enlarged view of A in

[0015] Figure 3 is Figure 1 is an enlarged view of B in

[0016] Figure 4is a structural schematic view of a third chuck assembly of an embodiment of the present application.

[0017] Reference signs in the drawings: 100 - rack, 110 - gantry, 120 - laser cutting assembly, 130 - first chuck assembly, 140 - second chuck assembly, 141 - first roller, 142 - second roller, 150 - third chuck assembly, 151 - clamping jaw, 200 - base, 300 - lifting assembly, 310 - first motor, 330 - first sliding rail, 340 - first rack, 350 - first switch, 360 - second switch, 370 - positioning structure, 371 - first plate body, 372 - second plate body, 373 - waist-shaped hole, 400 - support platform, 500 - support unit, 510 - support roller, 520 - inner rod, 530 - spring, 540 - bearing seat, 600 - clamping unit, 610 - clamping roller, 620 - clamping adjusting assembly, 621 - second motor, 622 - driving rod, 623 - second sliding rail, 624 - third sliding rail, 625 - connecting rod, 626 - clamping arm, 627 - first bearing. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the above embodiment description are briefly described. Obviously, the described drawings are only a part of the embodiments of the present application, not all the embodiments, and the person skilled in the art can obtain other design schemes and drawings according to these drawings without creative labor.

[0019] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and the person skilled in the art can obtain other embodiments without creative labor based on the embodiments of the present application, which all belong to the protection scope of the present application. In addition, all the coupling / connection relations mentioned in the text do not mean that the components are directly connected, but that a better coupling structure can be composed by adding or reducing coupling accessories according to the specific implementation situation. The technical features in the present application can be combined interactively without mutual contradiction and conflict.

[0020] In traditional long pipe laser cutting, the long pipe will produce significant sag due to its own weight, especially between the two fixed chucks, which will cause the distance between the cutting head and the pipe surface to change, affecting the cutting quality, and even collision. Although the traditional fixed support structure can lift the pipe, it will hinder the circumferential rotation and axial feeding of the pipe during cutting bevel, girth, etc. operation, and cannot adapt to complex cutting requirements. Some rigid supports directly slide in contact with the pipe, which is easy to scratch the surface of the pipe and damage the appearance and surface precision of the workpiece.

[0021] Therefore, the present application provides a high-precision pipe cutting machine, which refers to Figures 1-2 It comprises a rack 100, a gantry 110 arranged on the rack 100, a laser cutting assembly 120 arranged on the gantry 110, and a first chuck assembly 130, a second chuck assembly 140 and a third chuck assembly 150 arranged in turn on the rack 100 along the pipe feeding direction; It also includes a plurality of bases 200 and a plurality of follow-up support assemblies, a plurality of bases 200 are arranged in turn along the pipe feeding direction on the front side of the rack 100, and the follow-up support assemblies are arranged one by one on the bases 200. Each set of follow-up support assemblies includes a lifting assembly 300, a support platform 400, a support unit 500 and a clamping unit 600, the lifting assembly 300 is arranged on the base 200, the support platform 400 is arranged on the driving end of the lifting assembly 300, the lifting assembly 300 is used to drive the support platform 400 to lift along the vertical direction, the support unit 500 includes a support roller 510, the support roller 510 is arranged on the support platform 400 and can rotate relative to the support platform 400, the rolling axis of the support roller 510 is perpendicular to the pipe feeding direction, the clamping unit 600 includes two clamping rollers 610 and a clamping adjusting assembly 620, the clamping adjusting assembly 620 is arranged on the support platform 400, two clamping rollers 610 are arranged on the clamping adjusting assembly 620 and can rotate relative to the clamping adjusting assembly 620, the rolling axes of the two clamping rollers 610 are perpendicular to each other and perpendicular to the pipe feeding direction, and the two clamping rollers 610 together define a clamping space to limit the lateral position of the pipe, the clamping adjusting assembly 620 is used to adjust the lateral size of the clamping space, and the support roller 510 and the two clamping rollers 610 together form a three-point supporting structure to allow the pipe to rotate circumferentially and move axially.

[0022] The gantry 100 and the portal frame 110 provide basic support, the first, second and third chuck assemblies 150 slide along the feeding direction to realize axial conveying of the pipe and drive the pipe to rotate circumferentially, cooperate with the laser cutting assembly 120 to complete cutting at different angles; the base 200 provides installation reference for the follow-up support assembly; the lifting assembly 300 drives the support platform 400 to vertically lift and adjust the support height to adapt to the lifting requirements of pipes of different diameters; the support unit 500 lifts the pipe from below, allows the pipe to rotate circumferentially and slide axially with low friction, and bears the main vertical load of the pipe; the two clamping rollers 610 of the clamping unit 600 limit the lateral position of the pipe from both sides to prevent the pipe from shifting left and right; the clamping adjustment assembly 620 can adjust the distance between the two rollers to adapt to pipes of different diameters. The three-point supporting structure supports the pipe from below by the supporting roller 510 and positions the pipe from both sides by the clamping rollers 610, effectively offsets the deflection of the dead weight, ensures that the pipe always maintains the preset axis during cutting, and reduces cutting errors; all support and clamping components are designed as rollers, which replace sliding friction with rolling friction, allowing the pipe to rotate freely circumferentially to meet multi-angle cutting and realizing low-resistance axial feeding without affecting the machining action; the rolling contact between the rollers and the pipe greatly reduces surface friction and avoids scratching, especially for precision pipes with high surface requirements; multiple follow-up support assemblies are arranged at intervals along the feeding direction and can be flexibly enabled according to the length of the pipe to form segmented supporting and further suppress the vibration and deformation of long pipes.

[0023] The pipe to be cut is loaded onto the follow-up support assembly, the lifting assembly 300 of all follow-up support assemblies drives the support platform 400 to rise until the support rollers 510 are in contact with the bottom of the pipe and provide stable lifting, then the clamping unit 600 of all follow-up support assemblies is actuated, the clamping adjustment assembly 620 drives the two clamping rollers 610 to move closer to the pipe until they fit on both sides of the pipe, forming three-point positioning to limit the lateral deviation of the pipe; the support platform 400 and the pipe are lifted together until the axis of the pipe is completely coincident with the center axis of the first, second and third chucks, the pipe is clamped by the first chuck assembly 130 and the second chuck assembly 140 and is pushed by the first chuck assembly 130 to move towards the laser cutting assembly 120 to realize cutting feeding; during the feeding process, the pipe rolls forward on the support rollers 510 and the clamping rollers 610, the frictional resistance is small, each follow-up support assembly can be lifted individually according to the feeding position, avoiding the first chuck assembly 130 and providing continuous support for the overhanging section; the cut-off pipe section is clamped by the third chuck assembly 150 and is transferred to the unloading area to complete unloading. When the remaining length of the pipe is short and the first chuck cannot clamp it any more, the third chuck moves forward to clamp the tail end of the pipe, the second chuck assembly 140 moves to the side away from the third chuck assembly 150 to assist in clamping, at this time the tail is clamped from both ends by the third chuck assembly 150 and the second chuck assembly 140, and the laser cutting assembly 120 cuts the last section of tail, since it is clamped from both ends, even a very short tail can be stably processed.

[0024] During the lifting process of the support platform 400, it is prone to jam, sway or lateral deviation, which may cause uneven contact between the support roller 510 and the pipe, resulting in scratches on the surface of the pipe. Therefore, in an embodiment, the lifting assembly 300 comprises a first motor 310, a first gear, a first slide rail 330 and a first rack 340. The first slide rail 330 is arranged vertically on the base 200, and the support platform 400 is in sliding connection with the first slide rail 330. The first rack 340 is arranged on the base 200 and is arranged in parallel with the first slide rail 330. The first motor 310 is arranged on the support platform 400. The first gear is coaxially arranged with the output end of the first motor 310. The first gear is in engagement with the first rack 340. The first motor 310 is used to drive the support platform 400 to reciprocate along the first slide rail 330. The first motor 310 drives the first gear to move along the first rack 340 in parallel with the slide rail. The gear and rack transmission has the characteristics of stable transmission ratio and high precision. In combination with the guiding effect of the first slide rail 330 on the support platform 400, the precise lifting of the support platform 400 in the vertical direction can be realized. The lifting height required for different diameter pipes can be accurately adjusted. The adaptation range is wide, which meets the diversified processing requirements. The first slide rail 330 is in sliding connection with the support platform 400, which provides stable guidance for lifting movement and avoids the jamming problem of traditional structure. The mechanical rigidity of the gear and rack transmission is good, and the vibration during operation is small, which can ensure the stable lifting of the support platform 400. At the same time, the motor drive responds quickly. According to the needs of the follow-up support assembly to avoid the chuck or to lift the overhanging section, the height adjustment can be quickly completed, and the flexibility of the follow-up support is improved.

[0025] The support platform 400 can interfere with the chuck assembly, the pipe material, etc. due to control failure or malfunction beyond the safe lifting range, causing equipment failure. Therefore, in one embodiment, the lifting assembly 300 further comprises a first switch 350, a second switch 360, a sensing sheet and a positioning structure 370; the first switch 350 is fixedly installed on the top of the base 200, the second switch 360 is fixedly installed on the bottom of the base 200, the sensing sheet is installed on the support platform 400 through the positioning structure 370, and the first switch 350 and the second switch 360 are both electrically connected with the first motor 310; when the first motor 310 drives the support platform 400 to move to the limit position of the rack 100, the sensing sheet triggers the first switch 350 or the second switch 360, and the first motor 310 stops running. Through the cooperation of the first switch 350, the second switch 360 and the sensing sheet, the lifting limit position of the support platform 400 can be accurately detected; when the support platform 400 rises to the top of the base 200 or falls to the bottom of the base 200, the sensing sheet triggers the corresponding switch, the first motor 310 immediately stops running, effectively preventing the support platform 400 from overtraveling and colliding, avoiding the damage of the motor, the gear rack or the sliding rail due to impact, prolonging the service life of the lifting assembly 300; compared with the hard impact of the mechanical stop block, the shutdown response of the electronic switch is more gentle, there is no violent collision, the support platform 400 can be ensured to stop smoothly at the limit position, the pipe material is prevented from being displaced during lifting due to impact, the coincidence degree of the pipe material axis and the chuck center axis is ensured, and the cutting accuracy is indirectly maintained.

[0026] The installation error can cause the position deviation of the inductive sheet, and the machine can stop before reaching the limit, affecting the lifting stroke, or stop after overtravel, causing collision. Therefore, in an embodiment, the positioning structure 370 includes an L-shaped plate composed of a first plate body 371 and a second plate body 372, a first screw and a second screw; the first plate body 371 of the L-shaped plate is threadedly connected with the support platform 400 by the first screw, the second plate body 372 of the L-shaped plate is provided with two waist-shaped holes 373, the second screw is slidably inserted into the waist-shaped hole 373, and the second screw is threadedly connected with the inductive sheet. By cooperating the waist-shaped hole 373 with the second screw, the position of the inductive sheet can be adjusted along the length direction of the waist-shaped hole 373, the position deviation caused by the installation error or component wear is corrected, it is ensured that the inductive sheet can accurately trigger the switch when the support platform 400 reaches the limit position, early or late triggering is avoided, and the reliability of the limit protection is improved; the adjustable range of the waist-shaped hole 373 provides installation space for inductive sheets of different sizes and thicknesses, without the need to replace the positioning structure 370, only the position of the second screw in the waist-shaped hole 373 needs to be adjusted, and a variety of specifications of inductive sheets can be adapted, reducing the use of special parts and reducing maintenance costs; the L-shaped plate is fixed with the support platform 400 by the first screw, the inductive sheet is connected with the L-shaped plate by the second screw, and the overall disassembly is not required during the adjustment process, the operation difficulty is reduced, and the adjustment time is saved.

[0027] After power failure, the support platform 400 will freely slide along the slide rail due to the self-weight of the pipe material and the inertia of the assembly, and may collide with the bottom of the base 200. Therefore, in an embodiment, the first motor 310 has a power failure automatic brake function. The first motor 310 has a power failure automatic brake function, and once the motor is powered off, the brake device will start immediately, mechanically locking the motor output shaft to prevent the support platform 400 from sliding downward due to self-weight or inertia, effectively avoiding problems such as collision of the support platform 400 with the base 200, displacement or falling of the pipe material, and improving the safety of the equipment under abnormal working conditions; during the pipe material lifting process, if temporary stop is required for adjustment, the power failure brake can firmly lock the height of the support platform 400, preventing it from slowly sliding downward due to small external force or pipe material pressure, ensuring that the pipe material is always at the preset lifting height, maintaining the coincidence degree of the pipe material axis and the chuck center axis, and providing stable guarantee for subsequent cutting accuracy.

[0028] The moving speed and distance of the clamping rollers 610 on both sides can be inconsistent, resulting in uneven contact between the clamping rollers 610 and the pipe, lateral positioning deviation of the pipe, and affecting the cutting accuracy. Therefore, in an embodiment, the clamping adjusting assembly 620 comprises a second motor 621, a driving rod 622, a second sliding rail 623, a third sliding rail 624, two connecting rods 625, two clamping arms 626, and two first bearings 627. The second sliding rail 623 is arranged on the support platform 400 in the vertical direction. The driving rod 622 is in sliding connection with the second sliding rail 623. The third sliding rail 624 is arranged on the support platform 400, and the extension direction of the third sliding rail 624 is perpendicular to the pipe feeding direction. The two clamping arms 626 are in sliding connection with the third sliding rail 624, respectively. One end of each of the connecting rods 625 is hingedly connected to the clamping arm 626 in a one-to-one correspondence. The other end of each of the connecting rods 625 is hingedly connected to the center of the driving rod 622. The two first bearings 627 are arranged on the clamping arms 626, respectively. The two clamping rollers 610 are in rotational connection with the clamping arms 626 through the two first bearings 627, respectively. The second motor 621 is arranged on the support platform 400. The output end of the second motor 621 is fixedly connected to the driving rod 622. Through the symmetrical transmission structure of the driving rod 622 and the double connecting rods 625, when the second motor 621 drives the driving rod 622 to move along the second sliding rail 623, the two connecting rods 625 will synchronously drive the clamping arms 626 on both sides to slide along the third sliding rail 624, ensuring symmetrical adjustment of the distance between the clamping rollers 610 on both sides, avoiding unilateral deviation, keeping the pipe always in the center positioning position, improving the lateral positioning accuracy, and ensuring the stability of the pipe axis during cutting. The first bearing 627 allows the clamping roller 610 to rotate flexibly with the clamping arm 626, and cooperates with the uniform contact brought by symmetrical adjustment, so that the pipe and the roller are in stable rolling friction, without jamming or uneven force phenomenon, ensuring smooth pipe circumferential rotation and axial feeding, and not affecting the accuracy of complex cutting action. The second motor 621 drives the driving rod 622 to move along the second sliding rail 623, and drives the clamping arms 626 to slide along the third sliding rail 624 through the connecting rods 625, so as to adjust the distance between the two clamping rollers 610.

[0029] When the pipe material has diameter deviation or vibration, the local pressure may cause surface indentation, scratch or deformation of the pipe material. Thus, in an embodiment, the support unit 500 further comprises two inner rods 520, two springs 530 and two bearing seats 540, the inner rods 520 are fixedly arranged on the support platform 400, the two bearing seats 540 are respectively sleeved on the two inner rods 520, the two ends of the support roller 510 are respectively arranged on the two bearing seats 540 and can rotate relative to the bearing seats 540, the two springs 530 are respectively sleeved on the two inner rods 520, one end of the two springs 530 is respectively connected with the bottom of the two bearing seats 540, the other end of the spring 530 is connected with the support platform 400, and the spring 530 has a tendency to push the bearing seat 540 away from the support platform 400. Through the upward pushing force of the spring 530 on the bearing seat 540, the support roller 510 forms elastic contact with the pipe material instead of rigid collision, and when the pipe material has diameter deviation, bending or vibration, the spring 530 can adjust the support height by itself, so as to ensure that the support roller 510 is always in contact with the surface of the pipe material and the pressure is uniform, thereby avoiding local excessive pressure to cause surface indentation, deformation or scratch of the pipe material, and the device is especially suitable for precision pipe material processing. For the pipe material with slight bending or diameter fluctuation, the elastic force of the spring 530 can push the bearing seat 540 to slide up and down along the inner rod 520, drive the support roller 510 to adjust the height in real time, and ensure that the support roller 510 always effectively lifts the pipe material, thereby avoiding support failure caused by local protrusion or depression of the pipe material, and adapting to more complex pipe material processing scenarios.

[0030] When the pipe material rotates or feeds, it may slip, resulting in deviation of the actual movement speed of the pipe material. Thus, in an embodiment, the outer surfaces of the support roller 510 and the clamping roller 610 are provided with an anti-skid wear-resistant layer. The anti-skid wear-resistant layer directly increases the friction coefficient between the roller and the pipe material surface, so as to provide stable friction force even when the rotation or feeding speed of the pipe material changes, effectively avoid pipe material slipping, ensure that the movement of the pipe material is synchronized with the driving of the chuck, improve the accuracy of the cutting track, reduce the cutting error caused by slipping, and the anti-skid wear-resistant layer is made of epoxy resin synthetic material, and can also be made of wear-resistant rubber and the like.

[0031] Preferably, with reference to Figures 3-4The second chuck assembly 140 is provided with a first set of four first rollers 141 arranged in a circumferential array and a second set of four second rollers 142 arranged in a circumferential array, and the third chuck assembly 150 is provided with a set of four clamping jaws 151 arranged in a circumferential array. The first rollers 141 and the second rollers 142 of the second chuck assembly 140 contact the pipe through a multidirectional roller contact pipe, which can provide stable radial support and allow the pipe to rotate freely in the circumferential direction and feed axially, solve the contradiction that the traditional clamping jaws 151 provide stable clamping but limit movement or pure rollers allow movement but clamping is weak, adapt to complex cutting requirements such as bevels and annular seams; the clamping jaws 151 of the third chuck assembly 150 provide rigid clamping and can cooperate with the roller set of the second chuck to realize segmented clamping; at the same time, the second chuck is fixed in position, and the third chuck can be moved to the left side of the laser cutting assembly 120, so that the three chucks act on the pipe at the same time, which is especially suitable for cutting the middle section of long pipes or processing short tail pipes, avoids pipe vibration caused by insufficient clamping points, and improves cutting stability; the roller set of the second chuck contacts the pipe through rolling friction, and when the pipe is pushed by the first chuck or the third chuck, the rollers rotate synchronously with the pipe, reducing the pushing resistance and avoiding scratches on the surface of the pipe caused by rigid friction, which is especially suitable for high-precision pipes.

[0032] The preferred embodiments of the application are specifically described above, but the application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A high-precision pipe cutting machine, comprising a frame, a gantry mounted on the frame, a laser cutting assembly mounted on the gantry, and a first chuck assembly, a second chuck assembly, and a third chuck assembly sequentially slidably mounted on the frame along the pipe feeding direction; characterized in that, It also includes multiple bases and multiple follower support assemblies. The bases are sequentially and spaced apart along the tube feeding direction on the front side of the frame. Each follower support assembly is correspondingly mounted on a base. Each follower support assembly includes a lifting assembly, a support platform, a support unit, and a clamping unit. The lifting assembly is mounted on the base, and the support platform is located at the drive end of the lifting assembly. The lifting assembly drives the support platform to move vertically up and down. The support unit includes support rollers, which are mounted on the support platform and can rotate relative to it. The moving axis is perpendicular to the pipe feeding direction. The clamping unit includes two clamping rollers and a clamping adjustment assembly. The clamping adjustment assembly is disposed on the support platform. The two clamping rollers are disposed on the clamping adjustment assembly and can rotate relative to the clamping adjustment assembly. The rolling axes of the two clamping rollers are perpendicular to the pipe feeding direction. The two clamping rollers together define a clamping space to limit the lateral position of the pipe. The clamping adjustment assembly is used to adjust the lateral dimension of the clamping space. The support roller and the two clamping rollers together form a three-point support structure to allow the pipe to rotate circumferentially and move axially.

2. The high-precision tube cutting machine according to claim 1, characterized in that, The lifting assembly includes a first motor, a first gear, a first slide rail, and a first rack. The first slide rail is vertically mounted on the base. The support platform is slidably connected to the first slide rail. The first rack is mounted on the base and parallel to the first slide rail. The first motor is mounted on the support platform. The first gear is coaxially rotatably mounted with the output end of the first motor. The first gear meshes with the first rack. The first motor drives the support platform to reciprocate along the first slide rail.

3. A high-precision tube cutting machine according to claim 2, characterized in that, The lifting assembly also includes a first switch, a second switch, a sensor plate, and a positioning structure; the first switch is fixedly installed on the top of the base, the second switch is fixedly installed on the bottom of the base, the sensor plate is installed on the support platform through the positioning structure, and both the first switch and the second switch are electrically connected to the first motor. When the first motor drives the support platform to move to the limit position of the frame, the sensor plate triggers the first switch or the second switch, and the first motor stops running.

4. A high-precision tube cutting machine according to claim 3, characterized in that, The positioning structure includes an L-shaped plate composed of a first plate and a second plate, a first bolt, and a second bolt. The first plate of the L-shaped plate is threadedly connected to the support platform by the first bolt. The second plate of the L-shaped plate has two oblong holes, and the second bolt is slidably inserted into the oblong holes. The second bolt is threadedly connected to the sensing plate.

5. A high-precision tube cutting machine according to claim 2, characterized in that: The first motor has an automatic brake-holding function in case of power failure.

6. A high-precision tube cutting machine according to claim 1, characterized in that: The clamping adjustment assembly includes a second motor, a drive rod, a second slide rail, a third slide rail, two connecting rods, two clamping arms, and two first bearings. The second slide rail is vertically arranged on the support platform. The drive rod is slidably connected to the second slide rail. The third slide rail is arranged on the support platform with its extension direction perpendicular to the tube feeding direction. The two clamping arms are slidably connected to the third slide rail respectively. One end of each connecting rod is hinged to a clamping arm, and the other end of each connecting rod is hinged to the center of the drive rod. The two first bearings are respectively arranged on the clamping arms. The two clamping rollers are rotatably connected to the clamping arms through the two first bearings respectively. The second motor is arranged on the support platform, and the output end of the second motor is fixedly connected to the drive rod.

7. A high-precision tube cutting machine according to claim 1, characterized in that: The support unit further includes two inner rods, two springs, and two bearing seats. The inner rods are fixed to the support platform. The two bearing seats are respectively sleeved on the two inner rods. The two ends of the support roller are respectively disposed on the two bearing seats and can rotate relative to the bearing seats. The two springs are respectively sleeved on the two inner rods. One end of the two springs is connected to the bottom of the two bearing seats, and the other end of the springs is connected to the support platform. The springs have a tendency to push the bearing seats away from the support platform.

8. A high-precision tube cutting machine according to claim 1, characterized in that: The outer surfaces of both the support roller and the clamping roller are provided with an anti-slip and wear-resistant layer.

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