A laser cutting device for a motor home frame

Abstract

The application relates to the field of motor home frame cutting, in particular to a motor home frame laser cutting device which comprises a workbench top and a laser cutting structure, the laser cutting structure is installed at the top of the workbench top, the bottom of the workbench top is provided with a rotary material conveying structure, material passes through the middle of the rotary material conveying structure, the material is driven to rotate and move through the rotary material conveying structure, and the material is fixed through magnetic attraction during the rotating and moving process. The motor home frame laser cutting device adopts four-face magnetic attraction to replace the traditional mechanical clamping to fix the square tube material, effectively avoids the square tube deformation problem, and specifically, four rows of limiting wheels are evenly arranged in the circumferential direction in the feeding pipe, electromagnetic wheels are installed in the middle of the limiting wheels, the electromagnetic wheels simultaneously apply magnetic attraction to the square tube material from four directions after being electrified, and the material is adsorbed on the limiting wheels; since the magnetic attraction is a uniformly distributed adsorption force instead of a centralized mechanical clamping force.

Description

Technical Field

[0001] This invention relates to the field of RV frame cutting, and more particularly to an RV frame laser cutting device. Background Technology

[0002] As the core load-bearing structure of an RV, the manufacturing precision of the frame directly affects the overall safety and lifespan of the RV. Currently, RV frames mostly use square tubing as the main profile. The square tubing is precisely cut using laser cutting equipment before being welded and assembled into the frame structure. Laser cutting technology has advantages such as high cutting precision, smooth, burr-free cuts, and a small heat-affected zone. The cut edges of the square tubing can be directly used for subsequent welding without secondary grinding, significantly improving the manufacturing efficiency and quality of the RV frame.

[0003] In the laser cutting process of square tubes for RV frames, the tubes need to be rotated to cut bevels at different angles, and also need to move along their length to achieve cuts at different positions. Therefore, the clamping and fixing of the tubes places high demands on the process. In existing technologies, square tube clamping mechanisms generally employ four-planetary gear or rack transmission mechanisms, applying force simultaneously in four directions to clamp the tubes. For example, a clamping device for a square tube laser cutting machine disclosed in Chinese Patent (CN218109767U) uses this four-sided clamping structure. Furthermore, existing technologies have also developed schemes using four-bar linkages to form a four-sided positioning clamping structure. This involves a pair of longitudinally sliding crossbars and a pair of laterally sliding longitudinal bars intersecting vertically in a grid pattern to achieve simultaneous clamping of the tubes from all four sides.

[0004] However, the aforementioned four-sided clamping method has significant technical drawbacks in practical applications. During the cutting process, which requires rotation and movement of the square tube, the clamping mechanism must provide sufficient clamping force to ensure that the square tube does not slip relative to each other during rotation and movement. However, for square tubes with thin walls, excessive clamping force can easily cause deformation of the tube wall. Under concentrated force in four directions, the tube wall is prone to dents or twisting. Once the square tube deforms, it will not only affect the accuracy of the current cutting process but also directly affect the subsequent welding and assembly processes, leading to dimensional deviations in the frame structure, reduced welding quality, and even scrapping the entire frame.

[0005] Therefore, there is an urgent need to develop a laser cutting device for RV frames that does not deform the material during the cutting process. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a laser cutting device for RV frames that does not deform the material during the cutting process.

[0007] The technical solution is as follows: A laser cutting device for a motorhome frame includes a worktable and a laser cutting structure. The laser cutting structure is installed on the top of the worktable, and a rotating conveying structure is provided at the bottom of the worktable. The material passes through the middle of the rotating conveying structure, and the rotating conveying structure drives the material to rotate and move. During the rotation and movement, the material is fixed by magnetic attraction. The rotary conveying structure includes a feeding pipe that is rotatably and slidably disposed at the bottom of the worktable. Four rows of connecting shafts are arranged along the axial direction inside the feeding pipe. Limiting wheels are rotatably installed on each of the connecting shafts. The material passes through the space between the limiting wheels. An electromagnetic wheel is installed in the middle of each limiting wheel.

[0008] Preferably, the rotary conveying structure further includes an electric track disposed at the bottom of the worktable, the electric track being installed parallel to the feeding pipe, a movable seat being connected to the drive block of the electric track, and the feeding pipe being rotatably mounted on the movable seat.

[0009] Preferably, the rotary feeding structure further includes a rotary motor, the output shaft of which is connected to a pinion gear, and a gear ring meshing with the pinion gear is provided below it. The feeding pipe passes through the center of the gear ring and is slidably connected to the gear ring through a guide key. When the gear ring rotates, the feeding pipe rotates synchronously.

[0010] Preferably, the laser cutting structure includes a gantry mounted on the top of the worktable, an X-axis module above the gantry, a Z-axis module on the X-axis module, and a laser cutting head connected to the Z-axis module via a lifting slider.

[0011] Preferably, the device also includes a cutting position support mechanism mounted on the Z-axis module. The cutting position support mechanism includes adapter plates mounted on both sides of the Z-axis module. Each adapter plate has a vertically sliding plate at its end. A pad is rotatably mounted between the bottoms of the vertically sliding plates. The pad is located below the laser cutting head. When the laser cutting head moves upward away from the material, the pad moves downward synchronously. When the laser cutting head moves downward toward the material to cut, the pad moves upward synchronously to support the bottom of the material.

[0012] Preferably, the cutting position support mechanism further includes a vertical plate mounted vertically on the adapter plate. A rotating plate is rotatably mounted on the top of each vertical plate. The rotating plate has symmetrically opened waist-shaped holes at the front and back. A retaining shaft is slidably connected in each waist-shaped hole. The two retaining shafts are respectively fixedly connected to the lifting slider and the vertical sliding plate.

[0013] Preferably, the system also includes a feeding mechanism installed on the rear side of the worktable. The feeding mechanism includes a conveyor belt installed on the rear side of the worktable, and multiple sets of limiting plates are evenly spaced on the outer surface of the conveyor belt. The material is placed between each set of the limiting plates.

[0014] Preferably, a pad is provided below the upper feeding surface of the conveyor belt.

[0015] Preferably, the device also includes a feeding and discharging mechanism installed on the top of the worktable. The feeding and discharging mechanism includes a rodless cylinder installed above the worktable. The rodless cylinder is installed parallel to the feeding direction. A clamping cylinder is connected to the slider of the rodless cylinder, and the clamping cylinder is located at the material to be cut.

[0016] Preferably, the system also includes auxiliary feeding structures installed on both sides of the material to be processed. The auxiliary feeding structure includes a limiting part set at the bottom of the worktable, which is used to limit the material end at the feed end of the conveyor belt. The limiting part has a guide plate with an opening away from the conveyor belt on the side near the feed end of the conveyor belt. Both sides of the bottom of the worktable at the material inlet are provided with discharge inclined guide plates and feeding inclined guide plates. The wide opening of the discharge inclined guide plates on both sides faces the cutting direction, and the wide opening of the feeding inclined guide plates on both sides faces the conveyor belt. An auxiliary roller is rotatably installed between the discharge inclined guide plate and the feeding inclined guide plate on the same side.

[0017] The beneficial effects of this invention are as follows: This invention uses a four-sided magnetic attraction method to replace the traditional mechanical clamping for fixing square tube materials, effectively avoiding the problem of square tube deformation. Specifically, four rows of limiting wheels are evenly arranged circumferentially inside the feeding tube, and an electromagnetic wheel is installed in the middle of each limiting wheel. After the electromagnetic wheel is energized, it applies magnetic attraction force to the square tube material from four directions simultaneously, adsorbing the material onto the limiting wheel. Since the magnetic attraction force is a uniformly distributed attraction force rather than a concentrated mechanical clamping force, it meets the requirement of stable fixing of the material during rotation and movement, while avoiding the problem of the thin-walled square tube wall being concave or twisted due to excessive clamping force in the traditional four-sided clamping method, thus ensuring cutting accuracy and subsequent welding and assembly quality. Through the optimized design of the rotary feeding structure, the rotation and forward / backward movement of the square tube material are achieved independently or in tandem without interference. Specifically, the feeding tube is rotatably mounted on a movable base, and the moving base is driven by an electric track to achieve the forward and backward sliding of the feeding tube. At the same time, the feeding tube is slidably connected to the gear ring via a guide key. When the rotary motor drives the gear ring to rotate via a pinion, the guide key only transmits circumferential torque without restricting axial sliding, allowing the feeding tube to move freely forward and backward along the axial direction during rotation. This structural design ensures that the rotational motion and forward / backward movement do not interfere with each other, and can flexibly meet the processing requirements of different bevel cutting and segmented cutting. Through the linkage design of the cutting position support mechanism, the synchronous reverse movement of the laser cutting head and the pad cylinder is achieved, ensuring the stability of the material during the cutting process. Specifically, through the lever linkage between the rotating plate and the locking shaft, the movement of the lifting slider is transmitted to the rear end of the rotating plate via the rear locking shaft, and then transmitted in the opposite direction to the vertical sliding plate via the front locking shaft through the swinging action of the rotating plate, driving the pad cylinder to make a vertical movement opposite to that of the laser cutting head. When the laser cutting head moves downwards towards the material to cut, the pad cylinder automatically rises to provide bottom support, preventing the material from tilting or sagging at the cutting position due to suspension or uneven force; when the laser cutting head moves upwards away from the material, the pad cylinder automatically descends to make room, providing ample space for the material to rotate. The entire linkage process requires no additional power source, relying solely on the movement of the lifting slider for driving, and has the advantages of compact structure, reliable operation, and energy efficiency. Through the coordinated operation of the feeding mechanism and the feeding and discharging mechanism, the entire process of automatic material feeding, positioning and conveying, feeding into the cutting machine, and removal after cutting is realized. Specifically, the conveyor belt and the limiting plate enable the simultaneous, unidirectional, and equidistant continuous conveying of multiple materials. The pad plate ensures the load-bearing rigidity of the conveyor belt. The rodless cylinder and the clamping cylinder work together to automatically feed the material from the conveyor belt into the rotating conveying structure and automatically remove it and send it back to the conveyor belt after cutting. The entire process requires no manual intervention, which effectively improves the automation level and processing efficiency of the device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a diagram showing the installation positions of the laser cutting structure and the rotary feeding structure of the present invention.

[0020] Figure 3 This is a three-dimensional structural diagram of the laser cutting structure of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the rotary material conveying structure of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the cutting position support mechanism of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the feeding mechanism of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the feeding and discharging mechanism of the present invention.

[0025] Figure 8 This is a three-dimensional structural diagram of the auxiliary feeding structure of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 1_Worktable surface, 2_Laser cutting structure, 21_Gantry frame, 22_X-axis module, 23_Z-axis module, 24_Lifting slider, 25_Laser cutting head, 3_Rotary conveying structure, 31_Electric track, 32_Moving seat, 33_Feeding tube, 34_Connecting shaft, 35_Limiting wheel, 36_Electromagnetic wheel, 37_Rotary motor, 38_Pin gear, 39_Gear ring, 310_Guide key, 4_Cutting position support Mechanism, 41_Transfer plate, 42_Vertical sliding plate, 43_Pad cylinder, 44_Vertical plate, 45_Turn plate, 46_Oval hole, 47_Clamping shaft, 5_Feeding mechanism, 51_Conveyor belt, 52_Limiting plate, 53_Pad plate, 6_Feeding and discharging mechanism, 61_Rodless cylinder, 62_Clamping cylinder, 7_Auxiliary feeding structure, 71_Limiting part, 72_Guide plate, 73_Discharge inclined guide plate, 74_Feeding inclined guide plate, 75_Auxiliary roller. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example: Figures 1-4 As shown, a laser cutting device for RV frames is used to... Figure 1 For reference, the system includes a worktable 1 and a laser cutting structure 2. The laser cutting structure 2 is installed on the top front side of the worktable 1 for laser cutting of materials. A rotary conveyor structure 3 extends forward and backward from the bottom front side of the worktable 1. The material passes through the middle of the rotary conveyor structure 3 from back to front, and its cutting position moves to below the laser cutting structure 2. The rotary conveyor structure 3 drives the material to rotate and move, thereby changing the cutting position of the material to meet the cutting needs. During the rotation and movement, the material is fixed by magnetic attraction, ensuring that the cutting position of the material does not change. It will change; the rotary conveying structure 3 includes a feeding pipe 33, a connecting shaft 34, a limiting wheel 35, and an electromagnetic wheel 36. The feeding pipe 33 is rotatably and slidably connected to the front bottom of the worktable 1. The feeding pipe 33 can slide back and forth and rotate around its axis. Four rows of connecting shafts 34 are arranged along its axial direction inside the feeding pipe 33. The limiting wheel 35 is concentrically and rotatably installed on each connecting shaft 34. The material passes through the space between the limiting wheels 35. The outer surface of the limiting wheel 35 is in contact with the outer surface of the material to limit the material. The electromagnetic wheel 36 is installed in the middle of each limiting wheel 35. When the electromagnetic wheel 36 is energized, it generates magnetic force to attract the material.

[0029] When the device is in operation, the RV frame square tube material to be processed passes through the middle of the rotating conveying structure 3 in the front-to-back direction. Specifically, the square tube passes through the four rows of limiting wheels 35 inside the feeding pipe 33. In the initial state, the outer surface of the limiting wheels 35 is in contact with the outer surface of the square tube, which plays a preliminary guiding and limiting role for the square tube, so that the cutting position of the square tube can be aligned with the bottom of the laser cutting structure 2 on the worktable 1.

[0030] When the square tube needs to be rotated or moved back and forth to change the cutting position, the feeding tube 33, driven by an external power source, rotates around its own axis or slides in the back-and-forth direction relative to the worktable 1. During this process, since the square tube passes through the feeding tube 33 and is fitted and limited by the limiting wheel 35, the square tube rotates or moves synchronously with the feeding tube 33 under the constraint of the limiting wheel 35, so as to realize the adjustment of the cutting angle and the feeding of the cutting position.

[0031] While the feeding tube 33 drives the square tube to rotate and move, the electromagnetic wheel 36 located in the middle of the limiting wheel 35 is energized to generate magnetic force. This magnetic force acts on the outer surface of the square tube, magnetically attracting it tightly to the limiting wheel 35. Thus, the square tube is stably and reliably fixed during rotation and movement through four-sided magnetic attraction, preventing its cutting position from shifting during laser cutting. Simultaneously, the use of magnetic fixation instead of traditional rigid clamping avoids concentrated stress on the tube wall caused by clamping force, effectively preventing deformation and ensuring the smooth operation of subsequent welding and other processes. After cutting, the electromagnetic wheel 36 is de-energized and demagnetized, allowing the square tube to be released from its fixation and fed forward to the next cutting stage.

[0032] like Figure 3 and Figure 4 As shown, the rotary conveying structure 3 also includes an electric track 31 and a moving seat 32. The electric track 31 is symmetrically arranged on the left and right sides of the bottom front side of the worktable 1. The electric track 31 is installed parallel to the feeding pipe 33. The moving seat 32 is connected between the drive blocks of the electric track 31. The feeding pipe 33 is rotatably installed on the moving seat 32. The moving seat 32 and the feeding pipe 33 are moved in the front and back directions by the electric track 31.

[0033] like Figure 3 and Figure 4 As shown, the rotary feeding structure 3 also includes a rotary motor 37, a pinion 38, a gear ring 39, and a guide key 310. The rotary motor 37 is fixedly connected to the top of the worktable 1 above the feeding pipe 33 by bolts. The pinion 38 is connected to the output shaft of the rotary motor 37. The gear ring 39 is rotatably installed at the bottom of the worktable 1 below the pinion 38. The pinion 38 meshes with the gear ring 39. The feeding pipe 33 passes through the center of the gear ring 39 and is slidably connected to the gear ring 39 through the guide key 310. When the gear ring 39 rotates, the feeding pipe 33 will rotate synchronously to change the cutting position due to the action of the guide key 310.

[0034] When it is necessary to drive the material to feed or unload in the front-back direction, the electric track 31 is started, and its drive block drives the moving seat 32 to slide along the track direction. Since the feeding pipe 33 is rotatably installed on the moving seat 32, the feeding pipe 33 and the square tube material inside it move synchronously in the front-back direction under the drive of the moving seat 32, thereby realizing the axial feed of the cutting position.

[0035] When it is necessary to drive the material to rotate to change the cutting angle, the rotary motor 37, which is fixedly installed above the worktable 1, starts, and the pinion 38 on its output shaft rotates accordingly. The pinion 38 meshes with the gear ring 39, which is rotatably installed at the bottom of the worktable 1, thereby transmitting power to the gear ring 39 and driving it to rotate around its own axis. Since the feed tube 33 passes through the center of the gear ring 39, and the two are slidably connected in the front-to-back direction by the guide key 310, the rotational motion of the gear ring 39 is transmitted to the feed tube 33 through the guide key 310, driving the feed tube 33 and the square tube material inside it to rotate synchronously. At the same time, since the guide key 310 only transmits circumferential torque and does not restrict axial sliding, the feed tube 33 can still move freely in the axial direction under the drive of the moving seat 32 during rotation, so that the rotational motion and the front-to-back movement do not interfere with each other.

[0036] like Figure 2 and Figure 3 As shown, the laser cutting structure 2 includes a gantry 21, an X-axis module 22, a Z-axis module 23, a lifting slider 24, and a laser cutting head 25. The gantry 21 extending to the left and right is installed on the front top of the worktable 1. The X-axis module 22 extending to the left and right is fixed to the top of the gantry 21 by bolts. The Z-axis module 23 is set on the slider of the X-axis module 22. The Z-axis module 23 is driven by the X-axis module 22 to move left and right. The laser cutting head 25 is connected to the Z-axis module 23 by the lifting slider 24. The laser cutting head 25 is driven by the Z-axis module 23 to move vertically.

[0037] When the cutting position needs to be adjusted along the width of the RV frame square tube, the X-axis module 22 is activated, and its internal drive mechanism (such as a servo motor with a lead screw or synchronous belt) drives the slider to move in the left and right direction. Since the Z-axis module 23 is fixedly mounted on the slider of the X-axis module 22, the Z-axis module 23 moves left and right synchronously with the slider, realizing the precise positioning of the laser cutting head 25 in the X-axis direction.

[0038] When it is necessary to adjust the vertical distance between the laser cutting head 25 and the workpiece surface to accommodate different wall thicknesses or ensure focusing accuracy, the Z-axis module 23 is activated. Its drive mechanism drives the laser cutting head 25 to move up and down vertically via the lifting slider 24. The laser cutting head 25 is fixedly connected to the lifting slider 24, and achieves precise feed in the Z-axis direction with the movement of the lifting slider 24.

[0039] The X-axis module 22 drives the laser cutting head 25 to move left and right, and the Z-axis module 23 drives the laser cutting head 25 to move up and down, achieving flexible positioning of the cutting head in a two-dimensional plane. This movement, in conjunction with the forward and backward movement and rotation of the square tube material by the rotary feeding structure 3, allows the laser cutting head 25 to be aligned with any position of the square tube to be cut, completing bevel cutting and segmented cutting operations at different angles, thus meeting the processing requirements of complex cutting paths for RV frames.

[0040] like Figure 5 As shown, it also includes a cutting position support mechanism 4 installed on the lower left and right sides of the Z-axis module 23. The cutting position support mechanism 4 includes a transition plate 41, a vertical sliding plate 42, a pad 43, a vertical plate 44, a rotating plate 45, and a retaining shaft 47. Transition plates 41 extending forward and backward are provided on both the left and right sides of the lower part of the Z-axis module 23. A vertical sliding plate 42 is vertically slidably mounted at the front end of each transition plate 41. A pad 43 is rotatably mounted between the bottom of the vertical sliding plates 42, positioned to the left and right. The pad 43 is below the laser cutting head 25, and the material to be cut is positioned between the laser cutting head 25 and the pad 43. When the laser cutting head 25 moves upward away from the material, the pad 43 moves downward simultaneously to provide sufficient space for the material to rotate. When the laser cutting head 25 moves downward towards the material for cutting, the pad 43 moves upward simultaneously to provide sufficient space for the material to rotate. The bottom of the material is supported to prevent the cutting position from tilting and affecting the cutting quality. Vertical plates 44 are fixed vertically on the adapter plate 41. A rotating plate 45 is rotatably installed on the top of each vertical plate 44. The rotating plate 45 swings up and down around its center point. The rotating plate 45 has symmetrically extended waist-shaped holes 46 on the front and back. The waist-shaped holes 46 on both the front and back sides are slidably connected to the retaining shafts 47. The retaining shaft 47 on the front side is fixedly connected to its adjacent vertical sliding plate 42. The retaining shaft 47 on the rear side is fixed to the left and right sides of the lifting slider 24. When the lifting slider 24 moves upward, the retaining shaft 47 on it moves upward, causing the rear part of the rotating plate 45 to swing upward and the front part of the rotating plate 45 to swing downward, driving the vertical sliding plate 42 to move downward and the pad cylinder 43 to move downward, realizing the closing and separation of the laser cutting head 25 and the pad cylinder 43.

[0041] When the laser cutting head 25 moves upward and away from the material under the drive of the Z-axis module 23 for reversing or rotating operations, the lifting slider 24 drives the rear retaining shaft 47 to move upward synchronously. The retaining shaft 47 slides in the waist-shaped hole 46 on the rear side of the rotating plate 45, pushing the rear of the rotating plate 45 to swing upward. The rotating plate 45 rotates around its center point, and its front swings downward accordingly, driving the front retaining shaft 47 and the vertical sliding plate 42 fixedly connected to it to slide downward along the adapter plate 41. The downward movement of the vertical sliding plate 42 drives the pad cylinder 43 to move downward synchronously, so that the pad cylinder 43 is away from the bottom of the material, providing sufficient space for the material to rotate, avoiding the pad cylinder 43 interfering with the rotation of the material, and the cutting position support mechanism 4 can move together with the Z-axis module 23, which can better support the material.

[0042] When the laser cutting head 25 moves downward and approaches the material for cutting under the drive of the Z-axis module 23, the lifting slider 24 drives the rear retaining shaft 47 to move downward synchronously, pushing the rear of the rotating plate 45 to swing downward. The front of the rotating plate 45 swings upward accordingly, causing the front retaining shaft 47 and the vertical sliding plate 42 to slide upward. The pad cylinder 43 moves upward synchronously and fits tightly against the bottom of the material. At this time, the pad cylinder 43 provides reliable support below the material cutting position, effectively preventing the cutting position from tilting or sagging due to the material being suspended or unevenly stressed during laser cutting, thereby ensuring the flatness of the cutting surface and the cutting quality.

[0043] Through the above-mentioned linkage mechanism, when the laser cutting head 25 moves downward toward the material to cut, the pad cylinder 43 automatically rises to provide support, and when the laser cutting head 25 moves upward away from the material, the pad cylinder 43 automatically descends to make way, realizing the synchronous linkage between cutting and support. This not only ensures the stability of the material during the cutting process, but also provides sufficient clearance for the material rotation. Moreover, the entire action does not require an additional power source and can be driven by the movement of the lifting slider 24. It has the advantages of compact structure, reliable operation, energy saving and high efficiency.

[0044] like Figure 6 As shown, it also includes a feeding mechanism 5 installed on the rear side of the workbench 1. The feeding mechanism 5 includes a conveyor belt 51, a limiting plate 52, and a pad 53. A conveyor belt 51 extending to the left and right is installed on the rear side of the workbench 1. The left side of the conveyor belt 51 is the feeding end, and the right side is the discharging end. Multiple sets of limiting plates 52 are evenly spaced on the outer surface of the conveyor belt 51. Each set of limiting plates 52 consists of two plates, which are symmetrically arranged on the outer surface of the conveyor belt 51. The material is placed between each set of limiting plates 52. A pad 53 is provided below the upper feeding surface of the conveyor belt 51 to prevent the conveyor belt 51 from deforming due to the gravity of the material.

[0045] like Figure 7 As shown, it also includes a feeding and discharging mechanism 6 installed on the top of the worktable 1. The feeding and discharging mechanism 6 includes a rodless cylinder 61 and a clamping cylinder 62. The rodless cylinder 61 is extended back and forth above the worktable 1. The worktable 1 below the rodless cylinder 61 has a hollow design. The rodless cylinder 61 is installed parallel to the feeding direction. The clamping cylinder 62 is connected to the slider at the bottom of the rodless cylinder 61. The clamping cylinder 62 is located at the material to be cut. After the clamping cylinder 62 clamps the material, the rodless cylinder 61 drives the clamping cylinder 62 and the material to move back and forth, so as to put the material into the rotary conveying structure 3 and take the material out of the rotary conveying structure 3.

[0046] The square tube material to be processed is placed on the outer surface of the conveyor belt 51 in an orientation perpendicular to the conveying direction. Each set of limiting plates 52 consists of two plates, symmetrically arranged on the left and right sides. After the material is placed between the two limiting plates 52, the height of the limiting plates 52 is less than half the height of the material. The limiting plates 52 fit against the left and right sides of the material to limit its movement and prevent it from shifting or rolling during conveying. After the conveyor belt 51 starts, it carries the material placed between the limiting plates 52 continuously from the left conveying end to the right discharge end. Multiple sets of limiting plates 52 move along the outer surface of the conveyor belt 51. The evenly spaced surface allows multiple materials to be conveyed synchronously, in the same direction, and at equal intervals on the conveyor belt 51, achieving continuous feeding. A pad 53 is placed below the upper conveying surface of the conveyor belt 51, providing bottom support and preventing the conveyor belt 51 from deforming downwards due to the weight of the materials. This ensures that the upper conveying surface of the conveyor belt 51 remains flat, allowing the materials to move smoothly to the cutting feed end. At this point, the materials are conveyed to the rear of the rotary conveyor structure 3, with the worktable 1 extending forward and backward. The rodless cylinder 61 is activated. Installed parallel to the feeding direction, the slider at the bottom of the rodless cylinder 61 moves the clamping cylinder 62 to the rear of the rotary conveyor structure 3. After the clamping cylinder 62 clamps the upper part of the material, the rodless cylinder 61 drives the slider to move forward, causing the clamping cylinder 62 and the clamped material to move forward synchronously. Because the worktable 1 below the rodless cylinder 61 is hollowed out, the clamping cylinder 62 and the material can pass through the worktable 1 for clamping, feeding the material from back to front into the feeding tube 33 for laser cutting. During the cutting process, the clamping cylinder 62 needs to release the material. After the cutting is completed, the clamping cylinder 62 clamps the material again, and the rodless cylinder 61 drives the slider to move backward again. The clamping cylinder 62 clamps the cut material and takes it out from the feeding pipe 33 and sends it back to the conveyor belt 51. The conveyor belt 51 continues to run and transports the cut material to the right discharge end, thus realizing automatic feeding and taking out of the material. No manual intervention is required throughout the process, which effectively improves the automation level and processing efficiency of the RV frame laser cutting device.

[0047] like Figure 8As shown, it also includes auxiliary feeding structures 7 installed on both sides of the material to be processed. The auxiliary feeding structure 7 includes a limiting part 71, a guide plate 72, a discharge inclined guide plate 73, a feeding inclined guide plate 74, and an auxiliary roller 75. A limiting part 71 extending to the left and right is provided on the bottom left side of the worktable 1. The limiting part 71 is located at the front left side of the conveyor belt 51. During the process of material being conveyed from left to right, the limiting part 71 is used to limit the front end of the material at the feeding end of the conveyor belt 51. The limiting part 71 is close to the feeding end of the conveyor belt 51. A guide plate 72 with an opening away from the conveyor belt 51 is inclined on one side of the feed end. If the material at the feed end protrudes forward, it will gradually move backward under the guidance of the inclined surface of the guide plate 72. A discharge inclined guide plate 73 and a feeding inclined guide plate 74 are provided on both the left and right sides of the bottom of the workbench 1 at the material inlet. The wide opening of the discharge inclined guide plate 73 faces the cutting direction, and the wide opening of the feeding inclined guide plate 74 faces the conveyor belt 51. (For specific installation details of the discharge inclined guide plate 73 and the feeding inclined guide plate 74, please refer to...) Figure 8 An auxiliary roller 75 is rotatably mounted between the discharge inclined guide plate 73 and the feeding inclined guide plate 74 on the same side, see [reference]. Figure 8 It can be seen that when the material enters the cutting station and leaves the cutting station, the discharge inclined guide plate 73 and the feeding inclined guide plate 74 provide guidance and positioning to ensure that the material can accurately enter the rotary conveying structure 3 and return to the conveyor belt 51 after cutting. The parts of the discharge inclined guide plate 73, the feeding inclined guide plate 74 and the auxiliary roller 75 that are on the moving path of the clamping cylinder 62 are below the clamping cylinder 62.

[0048] When the auxiliary feeding structure 7 is in operation, it aligns and organizes the material at the feed end of the conveyor belt 51 through the cooperation of the limiting part 71 and the guide plate 72, and provides guidance and positioning for the material to enter and exit the cutting station through the cooperation of the discharge inclined guide plate 73, the feeding inclined guide plate 74 and the auxiliary roller 75. Specifically, a limiting part 71 extending to the left and right is provided on the bottom left side of the workbench 1. The limiting part 71 is located at the front left side of the conveyor belt 51. When the material is conveyed from left to right on the conveyor belt 51, the limiting part 71 blocks and limits the front end of the material at the feed end of the conveyor belt 51 to prevent the material from moving forward beyond the preset position during the conveying process. A guide plate 72 is inclinedly provided on the side of the limiting part 71 near the feed end of the conveyor belt 51. The opening of the guide plate 72 is away from the direction of the conveyor belt 51. When a piece of material at the feed end protrudes forward due to the placement deviation, the front end of the material will contact the inclined guide plate 72. As the conveyor belt 51 continues to run, the material gradually moves backward and to the right under the guidance of the inclined surface of the guide plate 72, so that the front end of the material abuts against the limiting part 71, thereby realizing the neat arrangement of multiple pieces of material on the conveyor belt 51 and ensuring that the material can enter the subsequent process in a consistent posture. When the material enters the cutting station, a discharge inclined guide plate 73 and a feeding inclined guide plate 74 are installed on the left and right sides of the bottom of the workbench 1 at the material inlet. The wide opening of the discharge inclined guide plate 73 faces the cutting direction, and the wide opening of the feeding inclined guide plate 74 faces the conveyor belt 51. When the material is clamped by the clamping cylinder 62 from the conveyor belt 51 and fed forward into the rotary conveying structure 3, the discharge inclined guide plates 73 on both sides guide the front end of the material with their wide openings facing the cutting direction, accurately guiding the material into the center position of the feeding pipe 33 of the rotary conveying structure 3. After the material is cut, it is taken out by the clamping cylinder 62 and sent back to the conveyor. When the conveyor belt 51 is in operation, the feeding inclined guide plates 74 on both sides guide the rear end of the material with their wide openings facing the direction of the conveyor belt 51, accurately guiding the material back to the upper conveying surface of the conveyor belt 51, ensuring that the material can fall back smoothly onto the conveyor belt 51 and continue to be conveyed to the discharge end with the conveyor belt 51; at the same time, an auxiliary roller 75 is rotatably installed between the discharge inclined guide plate 73 and the feeding inclined guide plate 74 on the same side. During the movement of the material in and out of the cutting station, the auxiliary roller 75 rolls into contact with the side of the material, converting sliding friction into rolling friction, effectively reducing the frictional resistance during the movement of the material, and making the material enter and exit more smoothly. Through the synergistic effect of the above structures, the limiting part 71 and the guide plate 72 ensure the alignment of the materials on the conveyor belt 51. The discharge inclined guide plate 73, the feeding inclined guide plate 74 and the auxiliary roller 75 ensure that the materials can accurately enter the rotating conveying structure 3 and smoothly return to the conveyor belt 51 after cutting. This improves the positioning accuracy and operational stability of the entire device in the automatic feeding and discharging process. At the same time, due to the effect of the limiting part 71, the materials will not bulge forward and cause the materials to collide with the feeding inclined guide plate 74.

Claims

1. A laser cutting device for a motorhome frame, characterized in that, It includes a worktable (1) and a laser cutting structure (2). The laser cutting structure (2) is installed on the top of the worktable (1). A rotating conveying structure (3) is provided at the bottom of the worktable (1). The material passes through the middle of the rotating conveying structure (3). The rotating conveying structure (3) drives the material to rotate and move. During the rotation and movement, the material is fixed by magnetic attraction. The rotary conveying structure (3) includes a feeding pipe (33) that is rotatably and slidably disposed at the bottom of the worktable (1). Four rows of connecting shafts (34) are arranged along its axial direction inside the feeding pipe (33). Limiting wheels (35) are rotatably installed on each of the connecting shafts (34). The material passes through the limiting wheels (35). An electromagnetic wheel (36) is installed in the middle of each limiting wheel (35). The laser cutting structure (2) includes a gantry (21) installed on the top of the worktable (1), an X-axis module (22) is provided above the gantry (21), a Z-axis module (23) is provided on the X-axis module (22), and a laser cutting head (25) is connected to the Z-axis module (23) via a lifting slider (24). It also includes a cutting position support mechanism (4) installed on the Z-axis module (23). The cutting position support mechanism (4) includes a transition plate (41) installed on both sides of the Z-axis module (23). The ends of the transition plate (41) are vertically slidably provided with vertical sliding plates (42). A pad (43) is rotatably installed between the bottoms of the vertical sliding plates (42). The pad (43) is below the laser cutting head (25). When the laser cutting head (25) moves upward away from the material, the pad (43) moves downward synchronously. When the laser cutting head (25) moves downward close to the material for cutting, the pad (43) moves upward synchronously to support the bottom of the material. The cutting position support mechanism (4) also includes a vertical plate (44) mounted vertically on the adapter plate (41). A rotating plate (45) is rotatably mounted on the top of the vertical plate (44). A waist-shaped hole (46) is symmetrically opened on the rotating plate (45). A retaining shaft (47) is slidably connected in the waist-shaped hole (46). The two retaining shafts (47) are respectively fixed to the lifting slider (24) and the vertical sliding plate (42).

2. The laser cutting device for a motorhome frame according to claim 1, characterized in that, The rotary conveying structure (3) also includes an electric track (31) set at the bottom of the worktable (1). The electric track (31) is installed parallel to the feeding pipe (33). A movable seat (32) is connected to the drive block of the electric track (31). The feeding pipe (33) is rotatably installed on the movable seat (32).

3. The laser cutting device for a motorhome frame according to claim 2, characterized in that, The rotary conveying structure (3) also includes a rotary motor (37), on which a pinion (38) is connected. A gear ring (39) meshes with the pinion (38) below it. The feeding pipe (33) passes through the center of the gear ring (39) and is slidably connected to the gear ring (39) through a guide key (310). When the gear ring (39) rotates, the feeding pipe (33) rotates synchronously.

4. The laser cutting device for a motorhome frame according to claim 1, characterized in that, It also includes a feeding mechanism (5) installed on the rear side of the workbench (1), the feeding mechanism (5) including a conveyor belt (51) installed on the rear side of the workbench (1), and multiple sets of limiting plates (52) are evenly spaced on the outer surface of the conveyor belt (51), and the material is placed between each set of the limiting plates (52).

5. The laser cutting device for a motorhome frame according to claim 4, characterized in that, A pad (53) is provided below the upper conveying surface of the conveyor belt (51).

6. The laser cutting device for a motorhome frame according to claim 1, characterized in that, It also includes a feeding and discharging mechanism (6) installed on the top of the workbench (1). The feeding and discharging mechanism (6) includes a rodless cylinder (61) installed above the workbench (1). The rodless cylinder (61) is installed parallel to the feeding direction. A clamping cylinder (62) is connected to the slider of the rodless cylinder (61). The clamping cylinder (62) is located at the material to be cut.

7. The laser cutting device for a motorhome frame according to claim 4, characterized in that, It also includes auxiliary feeding structures (7) installed on both sides of the material to be processed. The auxiliary feeding structure (7) includes a limiting part (71) set at the bottom of the worktable (1). The limiting part (71) is used to limit the material end at the feed end of the conveyor belt (51). The limiting part (71) is inclined with a guide plate (72) with an opening away from the conveyor belt (51) on the side near the feed end of the conveyor belt (51). The bottom left and right sides of the worktable (1) at the material inlet are provided with discharge inclined guide plates (73) and feeding inclined guide plates (74). The wide opening of the discharge inclined guide plates (73) on both sides faces the cutting direction, and the wide opening of the feeding inclined guide plates (74) on both sides faces the conveyor belt (51). An auxiliary roller (75) is rotatably installed between the discharge inclined guide plate (73) and the feeding inclined guide plate (74) on the same side.

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