Numerical control gantry sawing machine for oversized workpieces

Abstract

The invention relates to the field of numerical control gantry sawing machines, in particular to a numerical control gantry sawing machine for oversized workpieces. The invention discloses a full-automatic sawing machine which comprises a control center, a saw belt, a saw frame, a gantry type stand column, a hydraulic driving system, a main transmission mechanism, a feeding mechanism, a clamping mechanism and a saw belt guiding device. The control center is provided with a PID closed-loop control module, and the feeding mechanism comprises a feeding base and a plurality of material bearing roller ways which are connected in sequence; the feeding base is provided with a high-precision magnetic railing ruler connected with a control center, the clamping mechanism comprises a front clamping module, a feeding clamping module and a clamping driving device, the front clamping module is close to one side of the saw frame, the feeding clamping module comprises a feeding fixed jaw vice and a feeding movable jaw vice, and the clamping driving device is connected with the feeding fixed jaw vice. The clamping driving device is used for controlling the feeding clamping module to slide along the clamping sliding rail. Accurate positioning of the large workpiece is achieved through double clamping, and the problem that the machining stability of the large workpiece is insufficient is effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of numerically controlled gantry sawing machines, and particularly to a numerically controlled gantry sawing machine for extra-large workpieces. Background Art

[0002] In the field of processing extra-large metal components, traditional numerically controlled gantry sawing machines have technical bottlenecks: the saw wheels they use need to have a much larger diameter than the workpiece diameter to ensure normal cutting. This not only increases the overall outline dimensions of the machine tool, but also requires the saw frame to be enlarged, resulting in disadvantages such as poor rigidity, unstable operation, and easy vibration. Its saw band guiding device generally adopts a fixed structure, and the distance between the guiding arms is non-adjustable or only supports one-way adjustment, making it difficult to adapt to the processing scenarios of extra-large workpieces with multiple thicknesses and irregular cross-sections, leading to prominent problems such as out-of-tolerance perpendicularity caused by saw band deviation and abnormal wear of the guiding head. The coordination between the feeding mechanism and the clamping system is insufficient. The design of directly fixing the traditional vise to the feeding base causes cumulative errors due to continuous friction during the workpiece conveying process, and the deformation of the load-bearing roller path caused by the self-weight of the workpiece further exacerbates the inclination of the sawing section. At the same time, the magnetic grating scale signal is easily interfered by the cutting fluid, directly affecting the feeding accuracy. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a numerically controlled gantry sawing machine for extra-large workpieces: A numerically controlled gantry sawing machine for extra-large workpieces includes a control center, a saw band, a saw frame, a gantry-type column, a hydraulic drive system, a main drive mechanism, a feeding mechanism, a clamping mechanism, and a saw band guiding device. The control center is provided with a PID closed-loop control module. The saw frame and the gantry-type column form a vertical guide rail fit. The hydraulic drive system is used to control the saw frame to slide on the linear guide rail provided on the gantry-type column. The saw band guiding device limits and clamps the saw band, and the saw band guiding device is used to adjust the saw band from a horizontal state to a vertical stable state. The feeding mechanism includes a feeding base and a plurality of load-bearing roller paths connected in sequence. The feeding base is arranged below the saw frame and the load-bearing roller paths. The feeding base is provided with a high-precision magnetic grating scale connected to the control center. The clamping mechanism includes a front clamping module, a feeding clamping module, and a clamping drive device. The front clamping module is close to the saw frame side. The front clamping module includes a front fixed vise and a front movable vise that are adapted to each other for clamping and fixing the workpiece. The feeding clamping module includes a feeding fixed vise and a feeding movable vise that are adapted to each other. The clamping drive device includes a clamping hydraulic cylinder and a clamping slide rail in the same direction as the load-bearing roller path. The clamping slide rail is arranged on the feeding base and forms a sliding fit with the feeding clamping module. The clamping hydraulic cylinder is used to control the feeding clamping module to slide along the clamping slide rail.

[0004] Preferably, the feeding clamping module also includes a feeding slide fixedly connected to the lower end of the fixed feeding vise and the lower end of the movable feeding vise, the feeding slide and the clamping slide form a guide rail, the clamping hydraulic cylinder is connected to the feeding slide in a transmission manner, and the clamping hydraulic cylinder is used to control the position of the feeding slide on the clamping slide. The feeding slide of the feeding vise is below the material receiving roller, and the workpiece is sawed on the material receiving roller, so that the workpiece will not rub against the feeding slide to produce an error in the feeding length, and the sawing of the workpiece will not affect the sawing accuracy due to the lifting of the material head after multiple feedings. Now the workpiece disperses the pressure to the foundation through the roller, and the feeding system is only responsible for translation, completely avoiding the Sloven effect.

[0005] Preferably, the front fixed vise and the feeding fixed vise are both composed of a first clamp seat and a fixed clamp plate arranged on one side of the fixed clamp seat, and the front movable vise and the feeding movable vise are both composed of a second clamp seat, a thrust hydraulic cylinder arranged on the second clamp seat, and a movable clamp plate that is transmission-connected to the thrust hydraulic cylinder. A thrust hydraulic cylinder is installed on one side of the front movable vise and the feeding movable vise, which is opened when feeding and when the feeding workbench is idling, ensuring that the vise and the workpiece do not contact, thereby improving the feeding accuracy.

[0006] Preferably, the saw band guide device includes a movable guide arm and a fixed guide arm, the movable guide arm and the front movable vise are located on the same side, the movable guide arm includes a first arm seat, a sliding hydraulic cylinder, a locking hydraulic cylinder, a slide bar and a first guide head, the first arm seat is fixedly connected to the saw frame, the first arm seat and the slide bar movably installed in the first arm seat form a sliding fit, the sliding hydraulic cylinder is used to control the displacement of the slide bar in the first arm seat, the locking hydraulic cylinder is provided with two and respectively located in the middle of the upper and lower ends of the first arm seat, the locking hydraulic cylinder is provided with a locking push rod passing through the first arm seat, the two locking push rods respectively form a locking fit with the upper and lower sides of the slide bar, the locking push rod is used to lock the position of the slide bar relative to the first arm seat, the fixed guide arm includes a second arm seat fixedly connected to the saw frame and a second guide head arranged on one side of the second arm seat, the second guide head is close to one side of the first guide head. The movable guide arm is controlled to move left and right by the sliding hydraulic cylinder, and the automatic locking and release of the slide bar is controlled by the locking hydraulic cylinder. The top and sides of the first guide head and the second guide head are made of hard alloy, and a pre-guide device is also provided to ensure the stability of the guide and extend the service life of the saw blade. Different from the fixed guide device of the traditional gantry saw, the movable guide arm of the present invention realizes the up and down bidirectional locking of the slide bar through the double locking hydraulic cylinder, and cooperates with the displacement control of the sliding hydraulic cylinder to meet the processing requirements of workpieces of different thicknesses, solving the problem of guide stability when processing super-large workpieces.

[0007] Preferably, the main transmission mechanism includes a main motor, a worm gear box, a driving wheel, a top wheel, and a driven wheel. The main motor, worm gear box, and driving wheel are sequentially connected in transmission. The driving wheel, driven wheel, and top wheel are distributed in a triangular array. The top wheel is arranged at the top of the bow-shaped main saw part. The driving wheel and the driven wheel are arranged on both sides of the saw frame. The driving wheel, the driven wheel, and the top wheel are all arranged in the saw band and connected to the saw band. The worm gear box and the driving wheel are directly connected, the output torque is stable, the noise is small, and the sawing efficiency is high. By adjusting the speed by the frequency converter, a variety of band saw line speeds can be obtained.

[0008] Preferably, the saw band tensioning mechanism is also included, and the saw band tensioning mechanism includes a tensioning hydraulic cylinder, a tensioning seat and a sliding wheel seat, the tensioning seat and the sliding wheel seat form a guide rail adapter, the tensioning hydraulic cylinder is connected to the sliding wheel seat for controlling the displacement of the sliding wheel seat in the tensioning seat, and the sliding wheel seat is connected to the central axis provided by the driven wheel. The tensioning of the saw band adopts hydraulic tensioning, and the operation switch is integrated on the operation panel for convenient operation. The tensioning hydraulic cylinder drives the driven wheel to move in the tensioning seat, and the distance between the driving wheel and the driven wheel is changed to realize the tensioning of the saw band, thereby tensioning the saw band.

[0009] Preferably, it also includes a belt-breaking protection device, which includes a photoelectric sensor and an emergency stop relay arranged on the saw belt travel path. The photoelectric sensor signal is connected to the control center. The photoelectric sensor monitors the saw belt tension value in real time. When the displacement deviation of the saw belt exceeds the tension value ±15%, the emergency stop relay is triggered to cut off the power supply of the main motor and start the hydraulic system self-locking. The saw frame is equipped with a belt-breaking protection device. When the saw belt breaks or gets stuck, the equipment will automatically stop to ensure the safety of the operator and the integrity of the equipment.

[0010] Preferably, the saw frame includes a bow-shaped main saw portion and a crossbeam arranged at the lower part of the bow-shaped main saw portion, the bow-shaped main saw portion is a bow-shaped plate-like structure, the thickness of the bow-shaped main saw portion is ≥35mm, the surface of the bow-shaped main saw portion has a plurality of array-distributed reinforcing ribs, the natural frequency of the bow-shaped main saw portion is designed to be 1.3-1.5 times the working frequency, and the welding groove between the bow-shaped main saw portion and the crossbeam adopts an X-shaped double-sided groove structure. The bow-shaped main saw portion is made of high-quality steel plates and is welded by reasonable reinforcement ribs. After vibration aging, the welding stress is redistributed and eliminated, thereby ensuring the stability of the saw frame. Heavy-duty cutting is most afraid of resonance. This technical feature adopts a design with a natural frequency of 1.3-1.5 times the working frequency. This ratio has been verified by finite element analysis, and can avoid both the fundamental frequency and the secondary harmonics.

[0011] Preferably, the arcuate main saw part and the surface reinforcing ribs enclose a plurality of protective receiving grooves for receiving driving wheels, top wheels or driven wheels. The outer surface of the protective receiving groove is provided with a protective door panel for closing the protective receiving groove. A through groove for the saw band to pass through is provided between the protective receiving grooves. A saw band protective cover covering the through groove is provided outside the through groove. The protective door panel is provided with a travel switch interlocked with the main circuit, and the driving power supply is automatically cut off when the door is opened. For the dangerous areas on the machine tool, various reasonable enclosure protection structures are adopted. The driving wheels, top wheels or driven wheels are fully covered and protected. The saw band in the non-working area is provided with a professional saw band protective cover. The belt pulleys and the belt are covered by a semi-surrounding cover, and no rotating parts are exposed. There are obvious reminder signs for the dangers such as electrical cabinets. There are relevant warning signs and operating directions for the operating part of the saw band. A protective baffle is provided to effectively prevent sawdust and coolant from splashing. In addition, the electronic protection also adds alarms for saw band breakage and jamming states and equipment stop, power-off when the electrical control box door is opened, and interlocks between various actions controlled by the PLC. The electrical control box meets the IP54 protection level, and the emergency stop button meets the ISO13850 standard and is arranged within the reach of the operator within 0.6 m.

[0012] Preferably, it further includes a belt changing platform. The working surface height of the belt changing platform is flush with the saw band disassembly position, and the platform bearing capacity is ≥2000 kg / m². The belt changing platform is composed of a main platform corresponding to the middle of the saw frame and auxiliary platforms located on both sides of the saw frame. The two sides of the main platform are respectively fixedly connected to the two auxiliary platforms. The main platform is located between the driving wheel and the driven wheel and is flush with them. The control center is installed on one of the auxiliary platforms, and a stairway is provided on the auxiliary platform.

[0013] Beneficial effects: After the workpiece to be processed is placed on the load-carrying roller path of the feeding mechanism, the displacement of the workpiece is determined by a high-precision magnetic grating ruler. First, the workpiece is clamped by the feeding clamping module, and then the entire workpiece is displaced and conveyed by the clamping driving device. After the workpiece is conveyed to the set position, the front clamping module clamps. The double clamping by the clamping module and the feeding clamping module realizes the precise positioning of the large workpiece and effectively prevents the problem of insufficient machining stability of the large workpiece. The maximum sawing range that this equipment can achieve is a maximum diameter of 3000 mm / 3000×3000 mm and a minimum diameter of 850 mm / 850×80 mm; the maximum load-bearing capacity is 85 t. The feeding base is provided with a high-precision magnetic grating ruler, and the magnetic grating ruler is signal-connected to the control center. The resolution of the high-precision magnetic grating ruler reaches 1 μm, and a double closed-loop control system is constructed in cooperation with the PID closed-loop control algorithm, which can automatically compensate for the inertial displacement of the saw frame and control the saw band tension fluctuation range within ±2%. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the embodiment.

[0015] Figure 2 Internal structure diagram of the embodiment.

[0016] Figure 3 Internal front view of the embodiment.

[0017] Figure 4 Internal rear view of the embodiment.

[0018] Figure 5 is Figure 4 Enlarged schematic view of part A in

[0019] Figure 6 Schematic structural diagram of the movable guiding arm.

[0020] Reference numerals: 1, control center; 2, saw band; 3, saw frame; 4, gantry column; 5, feeding base; 6, material supporting roller table; 7, front fixed vise; 71, first vise base; 72, fixed vise plate; 8, front movable vise; 9, feeding fixed vise; 10, feeding movable vise; 101, second vise base; 102, thrust hydraulic cylinder; 103, movable vise plate; 11, clamping hydraulic cylinder; 12, clamping slide rail; 13, feeding slide table; 14, movable guiding arm; 141, first arm base; 142, sliding hydraulic cylinder; 143, locking hydraulic cylinder; 144, slide bar; 145, first guiding head; 15, fixed guiding arm; 16, main motor; 17, worm gear box; 18, driving wheel; 19, top wheel; 20, driven wheel; 21, tensioning hydraulic cylinder; 22, tensioning base; 23, sliding wheel base; 24, bow-shaped main saw part; 25, cross beam; 26, reinforcing rib; 27, protective accommodating groove; 28, protective door panel; 29, main table; 30, auxiliary table. Detailed implementation manners

[0021] The following further describes the present invention in conjunction with Figures 1-6 the embodiments.

[0022] Embodiment: A numerically controlled gantry sawing machine for extra-large workpieces, comprising a control center 1, a saw band 2, a saw frame 3, a gantry column 4, a hydraulic drive system, a main transmission mechanism, a feeding mechanism, a clamping mechanism, a saw band guiding device, a saw band tensioning mechanism, a broken band protection device and a band changing platform.

[0023] The control center 1 is provided with a PID closed-loop control module. The control center 1 is respectively connected to the hydraulic drive system, the main transmission mechanism, the feeding mechanism, the clamping mechanism and the saw band guiding device. The saw frame 3 and the gantry column 4 form a vertical guide rail cooperation. The hydraulic drive system is used to control the saw frame 3 to perform a sliding movement on the linear guide rail provided on the gantry column 4.

[0024] The saw band guiding device is arranged at the lower end of the saw frame 3. The saw band guiding device limits and clamps the saw band 2, and is used to adjust the saw band 2 from a horizontal state to a vertically stable state.

[0025] The feeding mechanism includes a feeding base 5 and a plurality of material supporting roller paths 6. The feeding base 5 is arranged below the saw frame 3. Each of the material supporting roller paths 6 is connected in sequence for conveying large workpieces. The feeding base 5 is provided with a high-precision magnetic grating ruler, and the magnetic grating ruler is signal-connected to the control center 1.

[0026] The clamping mechanism includes a front clamping module, a feeding clamping module and a clamping driving device. The front clamping module is close to one side of the saw frame 3. The front clamping module includes a front fixed vise 7 and a front movable vise 8. The front fixed vise 7 and the front movable vise 8 are adapted to each other for clamping and fixing the workpiece. The feeding clamping module includes a feeding fixed vise 9 and a feeding movable vise 10 which are adapted to each other. The clamping driving device includes a clamping hydraulic cylinder 11 and a clamping slide rail 12. The clamping slide rail 12 is arranged on the feeding base 5. The clamping slide rail 12 is located below the material supporting roller path 6 and in the same direction as the material supporting roller path 6. The clamping slide rail 12 is movably connected to the feeding fixed vise 9 and the feeding movable vise 10. The clamping hydraulic cylinder 11 is used to control the feeding fixed vise 9 and the feeding movable vise 10 to slide along the clamping slide rail 12. The feeding clamping module further includes a feeding slide table 13 fixedly connecting the lower ends of the feeding fixed vise 9 and the feeding movable vise 10. The feeding slide table 13 and the clamping slide rail 12 form a guide rail fit. The clamping hydraulic cylinder 11 is drivingly connected to the feeding slide table 13, and the clamping hydraulic cylinder 11 is used to control the position of the feeding slide table 13 on the clamping slide rail 12. The feeding slide table 13 of the feeding vise is below the material supporting roller path 6, and the sawing workpiece is on the material supporting roller path 6, so that the workpiece will not rub against the feeding slide table 13 to generate an error in the feeding length, and the sawing workpiece will not affect the sawing accuracy due to the upward lifting of the material head after multiple feedings. The front fixed vise 7 and the feeding fixed vise 9 are both composed of a first vise seat 71 and a fixed vise plate 72 arranged on one side of the fixed vise seat. The front movable vise 8 and the feeding movable vise 10 are both composed of a second vise seat 101, a thrust hydraulic cylinder 102 arranged on the second vise seat 101 and a movable vise plate 103 drivingly connected to the thrust hydraulic cylinder 102. The front movable vise 8 and the feeding movable vise 10 are provided with thrust hydraulic cylinders 102 on one side, and open when feeding and when the feeding workbench runs empty, ensuring that the vise and the workpiece do not contact, thereby improving the feeding accuracy.

[0027] The saw band guide device includes a movable guide arm 14 and a fixed guide arm 15. The movable guide arm 14 is located on the same side as the front movable vise 8. The movable guide arm 14 includes a first arm seat 141, a sliding hydraulic cylinder 142, a locking hydraulic cylinder 143, a slide bar 144 and a first guide head 145. The first arm seat 141 is fixedly connected to the saw frame 3. The first arm seat 141 and the slide bar 144 movably installed in the first arm seat 141 form a sliding fit. The sliding hydraulic cylinder 142 is used to control the slide bar 144 to move in the first arm seat 141. The movable guide arm 14 is provided with two locking hydraulic cylinders 143, which are respectively located at the middle of the upper and lower ends of the first arm seat 141. The locking hydraulic cylinder 143 is provided with a locking push rod passing through the first arm seat 141. The two locking push rods respectively form a locking fit with the upper and lower sides of the slide bar 144. The locking push rod is used to lock the position of the slide bar 144 relative to the first arm seat 141. The fixed guide arm 15 includes a second arm seat fixedly connected to the saw frame 3 and a second guide head arranged on one side of the second arm seat, and the second guide head is close to the first guide head 145. The movable guide arm 14 is controlled to move left and right by the sliding hydraulic cylinder 142, and the automatic locking and loosening of the slide bar 144 is controlled by the locking hydraulic cylinder 143. The top and side of the first guide head 145 and the second guide head are made of hard alloy, and a pre-guide device is also provided to ensure the stability of the guide and extend the service life of the saw band 2. Different from the fixed guide device of the traditional gantry saw, the movable guide arm 14 of the present invention realizes the up and down bidirectional locking of the slide rod 144 through the double locking hydraulic cylinder 143, and cooperates with the displacement control of the sliding hydraulic cylinder 142 to adapt to the processing requirements of workpieces of different thicknesses, solving the problem of guiding stability when processing super-large workpieces.

[0028] The main transmission mechanism includes a main motor 16, a worm gear box 17, a driving wheel 18, a top wheel 19, and a driven wheel 20. The main motor 16, the worm gear box 17, and the driving wheel 18 are sequentially connected in transmission. The driving wheel 18, the driven wheel 20, and the top wheel 19 are distributed in a triangular array. The top wheel 19 is arranged at the top of the bow-shaped main saw part 24. The driving wheel 18 and the driven wheel 20 are arranged on both sides of the saw frame 3. The driving wheel 18, the driven wheel 20, and the top wheel 19 are all arranged in the saw band 2 and are connected to the saw band 2 in a belt transmission. The worm gear box 17 and the driving wheel 18 are directly connected, the output torque is stable, the noise is small, and the sawing efficiency is high. By adjusting the speed by the frequency converter, a variety of band saw band 2 linear speeds can be obtained.

[0029] The saw band tensioning mechanism includes a tensioning hydraulic cylinder 21, a tensioning seat 22 and a sliding wheel seat 23. The tensioning seat 22 and the sliding wheel seat 23 form a guide rail adapter. The tensioning hydraulic cylinder 21 is connected to the sliding wheel seat 23 for controlling the displacement of the sliding wheel seat 23 in the tensioning seat 22. The sliding wheel seat 23 is connected to the central axis provided by the driven wheel 20. The tensioning of the saw band 2 adopts hydraulic tensioning, and the operation switch is integrated on the operation panel for easy operation. The tensioning hydraulic cylinder 21 drives the driven wheel 20 to move in the tensioning seat 22, and changes the distance between the driving wheel 18 and the driven wheel 20 to achieve the tensioning of the saw band 2, thereby tensioning the saw band 2.

[0030] The belt-breaking protection device includes a photoelectric sensor and an emergency stop relay arranged on the travel path of the saw belt 2. The photoelectric sensor signal is connected to the control center 1. The photoelectric sensor monitors the tension value of the saw belt 2 in real time. When the displacement deviation of the saw belt 2 exceeds the tension value ±15%, the emergency stop relay is triggered to cut off the power supply of the main motor 16 and start the hydraulic system self-locking. A belt-breaking protection device is installed on the saw frame 3. When the saw belt 2 breaks or gets stuck, the equipment will automatically stop to ensure the safety of the operator and the integrity of the equipment.

[0031] The saw frame 3 includes an arcuate main saw part 24 and a cross beam 25 arranged at the lower part of the arcuate main saw part 24. The arcuate main saw part 24 has an arcuate plate-like structure. The thickness of the arcuate main saw part 24 is ≥ 35 mm. There are multiple reinforcing ribs 26 distributed in an array on the surface of the arcuate main saw part 24. The natural frequency of the arcuate main saw part 24 is designed to be 1.3 - 1.5 times the operating frequency. The welding groove between the arcuate main saw part 24 and the cross beam 25 adopts an X-shaped double-sided groove structure. The arcuate main saw part 24 is made of high-quality steel plate and is formed by group welding with reasonable reinforcing ribs 26. After vibration aging, the welding stress is redistributed and eliminated, thus ensuring the stability of the saw frame 3. The arcuate main saw part 24 and the surface reinforcing ribs 26 enclose to form multiple protective accommodation grooves 27 for accommodating the driving wheel 18, the top wheel 19 or the driven wheel 20. A protective door panel 28 for closing the protective accommodation groove 27 is arranged on the outer surface of the protective accommodation groove 27. A through groove for the saw band 2 to pass through is arranged between the protective accommodation grooves 27. A saw band 2 protective cover covering the through groove is arranged outside the through groove. The protective door panel 28 is provided with a travel switch interlocked with the main circuit, and the driving power supply is automatically cut off when the door is opened. Various reasonable enclosure protection structures are adopted for the dangerous areas on the machine tool. The driving wheel 18, the top wheel 19 or the driven wheel 20, etc. are fully covered and protected. The saw band 2 in the non-working area is provided with a professional saw band 2 protective cover. The belt pulley and the belt are covered by a half-surrounding cover, and no rotating parts are exposed outside. There are relevant obvious warning signs for the electrical cabinet and other dangers. There are relevant warning signs and operating directions for the operating part of the saw band 2. A protective baffle is arranged to effectively prevent sawdust and coolant from splashing. In addition, the electronic protection also adds alarms for the saw band 2 breaking and jamming states and equipment stop, power-off when the electric control box door is opened, and interlocks between various actions controlled by the PLC. The electric control box meets the IP54 protection level, and the emergency stop button meets the ISO13850 standard and is arranged within the reach of the operator within 0.6 m.

[0032] The working surface height of the tape-changing platform is flush with the saw band 2 disassembly position. The platform load-bearing capacity is ≥ 2000 kg / m². The tape-changing platform is composed of a main platform 29 corresponding to the middle of the saw frame 3 and auxiliary platforms 30 located on both sides of the saw frame 3. Two auxiliary platforms 30 are respectively fixedly connected to both sides of the main platform 29. The main platform 29 is located between the driving wheel 18 and the driven wheel 20 and is flush with them. The control center 1 is installed on one of the auxiliary platforms 30, and a step ladder is arranged on the auxiliary platform 30.

[0033] Operating principle: Large workpieces are conveyed from the loading roller table 6 to the clamping mechanism. The front clamping module opens, and the feeding and clamping module clamps and feeds it forward to the set position, and then the front clamping module clamps and positions for sawing. After sawing is completed, the front clamping module is opened and then the feeding and clamping module is continued to feed the material to achieve repeated and precise sawing.

[0034] In this application, the PID module is set to collect the position signal of the saw frame 3 in real time at a sampling frequency of 1 kHz, and the proportional link is combined to realize the instant adjustment of the lifting speed of the saw frame 3. When processing ultra-large workpieces with a diameter within 3000 mm, the system can automatically compensate for the inertial displacement of the saw frame 3, and control the tension fluctuation range of the saw band 2 within ±2%. The feeding base 5 is provided with a high-precision magnetic grating ruler, and the magnetic grating ruler is signal-connected to the control center 1. The resolution of the high-precision magnetic grating ruler reaches 1 μm, and a double closed-loop control system is constructed in cooperation with the PID closed-loop control algorithm: the outer loop realizes the preset of the feeding length at the level of 0.01 mm, and the inner loop dynamically corrects the mechanical transmission error. Compared with traditional sawing machines, the feeding repeat positioning accuracy of ±0.3 mm can be achieved, and the risk of sawing surface inclination is completely eliminated.

[0035] After the user places the workpiece to be processed on the load-carrying roller path 6 of the feeding mechanism, the displacement of the workpiece is determined through the high-precision magnetic grating ruler. First, the workpiece is clamped through the feeding clamping module, and then the displacement of the entire workpiece is conveyed through the clamping driving device. After the workpiece is conveyed to the set position, the front clamping module realizes clamping. The precise positioning of the large workpiece is realized through the double clamping of the clamping module and the feeding clamping module, effectively preventing the problem of insufficient processing stability of the large workpiece.

[0036] The layout of the feeding slide table 13 of this application under the roller path is equivalent to physically separating the load-bearing function and the moving function. In traditional designs, these two are coupled, and the workpiece directly presses on the feeding mechanism to generate frictional resistance. Now the workpiece disperses the pressure to the foundation through the roller path, and the feeding system is only responsible for translation, completely avoiding the Slovenia effect.

[0037] Obviously, the above embodiments of the present invention are merely examples for explaining the present invention, and are not intended to limit the implementation manner of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And these obvious changes or variations derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A numerically controlled gantry sawing machine for extra-large workpieces, comprising a control center (1), a saw band (2), a saw frame (3), gantry-type columns (4), a hydraulic drive system, a main transmission mechanism, a feeding mechanism, a clamping mechanism, and a guiding device for the saw band (2). The control center (1) is provided with a PID closed-loop control module. The saw frame (3) and the gantry-type columns (4) form a vertical guide rail fit. The hydraulic drive system is used to control the saw frame (3) to perform a sliding movement on a linear guide rail provided on the gantry-type columns (4). The guiding device for the saw band (2) limits and clamps the saw band (2), and the saw band guiding device is used to adjust the saw band (2) from a horizontal state to a vertically stable state. The feeding mechanism includes a feeding base (5) and a plurality of successively connected material-carrying roller paths (6). The feeding base (5) is arranged below the saw frame (3) and the material-carrying roller paths (6). The feeding base (5) is provided with a high-precision magnetic grating ruler connected to the control center (1). The clamping mechanism includes a front clamping module, a feeding clamping module, and a clamping drive device. The front clamping module is close to one side of the saw frame (3). The front clamping module includes a front fixed vise (7) and a front movable vise (8) that are adapted to each other for clamping and fixing the workpiece. The feeding clamping module includes a feeding fixed vise (9) and a feeding movable vise (10) that are adapted to each other. The clamping drive device includes a clamping hydraulic cylinder (11) and a clamping slide rail (12) in the same direction as the material-carrying roller paths (6). The clamping slide rail (12) is arranged on the feeding base (5) and forms a sliding fit with the feeding clamping module. The clamping hydraulic cylinder (11) is used to control the feeding clamping module to slide along the clamping slide rail (12).

2. The numerically controlled gantry sawing machine for extra-large workpieces according to claim 1, wherein: The feeding clamping module further includes a feeding slide table (13) fixedly connecting the lower ends of the feeding fixed vise (9) and the feeding movable vise (10). The feeding slide table (13) forms a guide rail fit with the clamping slide rail (12). The clamping hydraulic cylinder (11) is drivingly connected to the feeding slide table (13). The clamping hydraulic cylinder (11) is used to control the position of the feeding slide table (13) on the clamping slide rail (12).

3. The numerically controlled gantry sawing machine for super-large workpieces according to claim 2, characterized in that: Both the front fixed vise (7) and the feeding fixed vise (9) are composed of a first vise base (71) and a fixed vise plate (72) arranged on one side of the fixed vise base. Both the front movable vise (8) and the feeding movable vise (10) are composed of a second vise base (101), a thrust hydraulic cylinder (102) arranged on the second vise base (101), and a movable vise plate (103) drivingly connected to the thrust hydraulic cylinder (102).

4. The numerically controlled gantry sawing machine for super-large workpieces according to claim 1, characterized in that: The saw band guiding device includes a movable guiding arm (14) and a fixed guiding arm (15). The movable guiding arm (14) is on the same side as the front movable vise (8). The movable guiding arm (14) includes a first arm seat (141), a sliding hydraulic cylinder (142), a locking hydraulic cylinder (143), a sliding rod (144) and a first guiding head (145). The first arm seat (141) is fixedly connected to the saw frame (3). The first arm seat (141) and the sliding rod (144) movably installed in the first arm seat (141) form a sliding fit. The sliding hydraulic cylinder (142) is used to control the displacement of the sliding rod (144) in the first arm seat (141). There are two locking hydraulic cylinders (143) which are respectively located in the middle of the upper and lower ends of the first arm seat (141). The locking hydraulic cylinder (143) is provided with a locking push rod passing through the first arm seat (141). The two locking push rods respectively form a clamping fit with the upper and lower sides of the sliding rod (144). The locking push rod is used to lock the position of the sliding rod (144) relative to the first arm seat (141). The fixed guiding arm (15) includes a second arm seat fixedly connected to the saw frame (3) and a second guiding head arranged on one side of the second arm seat. The second guiding head is close to the first guiding head (145).

5. A numerically controlled gantry saw for extra-large workpieces according to claim 1, characterized in that: The main transmission mechanism includes a main motor (16), a worm gear box (17), a driving wheel (18), a top wheel (19), and a driven wheel (20). The main motor (16), the worm gear box (17), and the driving wheel (18) are sequentially connected for transmission. The driving wheel (18), the driven wheel (20), and the top wheel (19) are distributed in a triangular array. The top wheel (19) is arranged at the top of the bow-shaped main saw part (24). The driving wheel (18) and the driven wheel (20) are respectively arranged on both sides of the saw frame (3). The driving wheel (18), the driven wheel (20), and the top wheel (19) are all arranged inside the saw band (2) and are in belt transmission connection with the saw band (2).

6. The numerically controlled gantry sawing machine for super-large workpieces according to claim 1, wherein: It further includes a saw band tensioning mechanism. The saw band tensioning mechanism includes a tensioning hydraulic cylinder (21), a tensioning seat (22), and a sliding wheel seat (23). The tensioning seat (22) and the sliding wheel seat (23) form a guide rail fit. The tensioning hydraulic cylinder (21) is connected for transmission to the sliding wheel seat (23) and is used to control the displacement of the sliding wheel seat (23) in the tensioning seat (22). The sliding wheel seat (23) is connected to the central axis of the driven wheel (20).

7. A numerically controlled gantry saw for extra-large workpieces according to claim 1, characterized in that: It further includes a saw band breakage protection device. The saw band breakage protection device includes a photoelectric sensor and an emergency stop relay arranged on the traveling path of the saw band (2). The photoelectric sensor is signal-connected to the control center (1). The photoelectric sensor monitors the tension value of the saw band (2) in real time. When the displacement deviation of the saw band exceeds the tension value by ±15%, the emergency stop relay is triggered to cut off the power supply of the main motor and start the self-locking of the hydraulic system.

8. A numerically controlled gantry sawing machine for super-large workpieces according to claim 1, characterized in that: The saw frame (3) includes an arcuate main saw part (24) and a cross beam (25) arranged at the lower part of the arcuate main saw part (24). The arcuate main saw part (24) has an arcuate plate-like structure. The thickness of the arcuate main saw part (24) is ≥35 mm. There are multiple reinforcing ribs (26) distributed in an array on the surface of the arcuate main saw part (24). The natural frequency of the arcuate main saw part (24) is designed to be 1.3 - 1.5 times the working frequency. The welding groove between the arcuate main saw part (24) and the cross beam (25) adopts an X-shaped double-sided groove structure.

9. The numerically controlled gantry sawing machine for extra-large workpieces according to claim 8, wherein: The arcuate main saw part (24) and the surface reinforcing ribs (26) enclose to form multiple protective accommodation grooves (27) for accommodating the driving wheel (18), the top wheel (19) or the driven wheel (20). A protective door panel (28) for closing the protective accommodation groove (27) is arranged on the outer surface of the protective accommodation groove (27). A through groove for the saw band (2) to pass through is arranged between the protective accommodation grooves (27). A protective cover for the saw band (2) covering the through groove is arranged outside the through groove. The protective door panel (28) is provided with a travel switch interlocked with the main circuit, and the driving power supply is automatically cut off when the door is opened.

10. A numerically controlled gantry sawing machine for extra-large workpieces according to claim 1, characterized in that: It further includes a tape-changing platform. The working surface height of the tape-changing platform is flush with the saw band disassembly position. The platform load-bearing capacity is ≥2000 kg / m². The tape-changing platform is composed of a main platform (29) corresponding to the middle of the saw frame (3) and auxiliary platforms (30) located on both sides of the saw frame (3). Two auxiliary platforms (30) are respectively fixedly connected to both sides of the main platform (29). The main platform (29) is located between the driving wheel (18) and the driven wheel (20) and is flush with both of them. The control center (1) is installed on one of the auxiliary platforms (30). The auxiliary platform (30) is provided with a step ladder.

Images