A laser cutting equipment for excavator frame production

Abstract

This application relates to the field of metal cutting technology and discloses a laser cutting device for excavator frame production, including a robotic arm body. A laser head is slidably mounted at the end of the robotic arm body. It also includes a mounting plate fixedly mounted at the end of the robotic arm body. A guide rail is fixedly mounted at the end of the mounting plate away from the robotic arm body. The end of the guide rail away from the mounting plate is slidably mounted to a slider. The end of the slider away from the guide rail is fixedly connected to the laser head. Hydraulic medium is squeezed against the upper sliding plate through a through hole on the lower sliding plate, creating a gap between the lower and upper sliding plates. The hydraulic medium can flow through the through hole to the gap between the ball and the main mounting groove and fill it. This allows the ball to maintain normal rolling connection with the guide rail during the initial wear stage, utilizing the hydraulic oil film sealing effect, continuing to uniformly transmit the load, reducing the probability of vibration affecting the stability of the guiding system after ball wear, and extending the service life of other balls and guide rails.

Description

Technical Field

[0001] This application relates to the field of metal cutting technology, and in particular to a laser cutting device for excavator frame production. Background Technology

[0002] The excavator frame is the structural core of the entire equipment, used to support and connect the excavator's engine, cab, working device, and traveling mechanism. During the frame manufacturing process, steel plates are often cut into the required shapes using high-precision lasers. Then, pipes are drilled and cut according to requirements. Finally, the pre-treated pipes and plates are assembled and welded together.

[0003] When cutting and drilling pipe fittings, the laser head is moved by a robotic arm to cut the pipe fittings. In order to improve the movement accuracy of the laser head, the laser head is not directly fixed to the end of the robotic arm, but is fixedly connected through a mounting bracket. The laser head is slidably connected to the mounting bracket. During cutting, the robotic arm first moves the laser head to the pre-cutting position, and then the drive source on the mounting bracket moves the laser head, so that the nozzle of the laser head moves towards the workpiece to the final position.

[0004] The drive source on the mounting bracket mainly consists of a motor, guide rail, and lead screw. The forward and reverse rotation of the motor enables the laser head to move forward and reset. When it is necessary to cut holes in the pipe or when there are many cutting points on the pipe, the laser head needs to move back and forth to reset after each cutting point. When the robotic arm moves the laser head to the next cutting point, the laser head extends again to prepare for cutting. During this process, when the slider fixedly connected to the laser head slides on the guide rail, the frequent reciprocating sliding of the slider will accelerate the wear of the slider and guide rail, affecting the positioning accuracy of the laser head.

[0005] To address this, existing technologies use rolling balls between the slider and the guide rail to replace sliding friction with rolling friction, thereby slowing down the wear rate between the slider and the guide rail. When multiple rolling balls operate synchronously, if one ball wears out, it loses its load-bearing capacity, increasing the load on the other unworn balls and accelerating their wear rate. The wear gap causes the worn rolling ball to vibrate against the slider and guide rail. This impact not only exacerbates the damage to the worn rolling ball itself but also transfers vibration energy to the slider and guide rail, triggering structural resonance in the entire guiding system. This causes the cutting spot position to drift, affecting the stability of the slider as it moves the laser head. Summary of the Invention

[0006] This application proposes a laser cutting device for excavator frame production. It features hydraulic medium compressed within a cylinder via a tension spring and piston rod. This hydraulic medium, through a through-hole on a lower sliding plate, compresses an upper sliding plate, creating a gap between them. The hydraulic medium then flows through the through-hole to fill the gap between the ball bearing and the main mounting groove, ensuring the ball bearing maintains normal rolling connection with the guide rail. This allows for continued uniform load transmission, reduces the probability of vibration affecting the stability of the guiding system due to ball wear, and extends the service life of other balls and the guide rail. This solution addresses the problem of vibration in the guiding system affecting the stability of the cutting spot position caused by wear of some balls during the reciprocating sliding of the laser head along the guide rail by the end-slider of the robotic arm.

[0007] To achieve the above objectives, this application adopts the following technical solution: a laser cutting device for excavator frame production, comprising a robotic arm body, a laser head slidably mounted at the end of the robotic arm body, and a mounting plate fixedly mounted at the end of the robotic arm body. A guide rail is fixedly mounted at the end of the mounting plate away from the robotic arm body, and a slider is slidably mounted at the end of the guide rail away from the mounting plate. The end of the slider away from the guide rail is fixedly connected to the laser head. Multiple balls are symmetrically and rotatably mounted on both sides of the slider. Multiple main mounting slots are opened on both sides of the slider, and each main mounting slot is adapted to a corresponding ball. A cylinder is fixedly mounted inside the slider. The rodless cavity of the cylinder is filled with hydraulic medium. The rodless cavity of the cylinder is fixedly connected to the main mounting slot through a connecting pipe. When the balls wear, the gap between the balls and the main mounting slot is filled by the flow of hydraulic medium in the cylinder and the connecting pipe.

[0008] Furthermore, a lower sliding plate is fixedly installed inside the end of the connecting pipe away from the cylinder body, and an upper sliding plate is slidably installed above the lower sliding plate. The side of the upper sliding plate away from the lower sliding plate is in contact with the ball. Both the lower sliding plate and the upper sliding plate are provided with through holes for hydraulic oil to flow, and the through holes on the lower sliding plate and the upper sliding plate are staggered.

[0009] Furthermore, a sliding column is fixedly installed at the bottom of the upper sliding plate. The end of the sliding column away from the upper sliding plate moves through the lower sliding plate and is fixedly installed with a support rod. Both ends of the support rod are slidably connected to the inner sidewall of the connecting pipe.

[0010] Furthermore, a piston rod is slidably connected to one end of the cylinder body, and the end of the piston rod away from the cylinder body moves through the side wall of the slider and is fixedly connected to a pull ring. A tension spring is fitted on the outside of the piston rod, and the two ends of the tension spring are fixedly connected to the side wall of the slider and the pull ring, respectively. The elastic force of the tension spring causes the piston rod to squeeze the hydraulic medium in the cylinder body.

[0011] Furthermore, the slider has two symmetrical adjustment grooves inside, one end of which penetrates the side wall of the slider, and each main mounting groove is connected to the adjustment groove. A sealing ring is fixedly installed on the side of the main mounting groove away from the adjustment groove.

[0012] Furthermore, an adjustment plate is slidably installed inside the adjustment groove, and multiple secondary placement grooves are opened on one side of the adjustment plate, with each secondary placement groove being adapted to the corresponding main placement groove.

[0013] Furthermore, a screw tube is fixedly installed on the top of the pull ring, a screw rod is threadedly connected to the end of the screw tube near the slider, a sliding ball is rotatably installed at the end of the screw rod away from the screw tube, and an inclined block is slidably installed on the side wall of the slider for upper limit.

[0014] The beneficial effects of this invention are as follows: This application provides a laser cutting device for excavator frame production. When the ball bearings wear out, under the action of the tension spring, the piston rod squeezes the hydraulic medium in the cylinder and connecting pipe, and squeezes the upper sliding plate through the through hole on the lower sliding plate, creating a gap between the lower and upper sliding plates. The hydraulic medium can flow through the through hole to the gap between the ball bearings and the main mounting groove and fill it. This allows the ball bearings to maintain normal rolling connection with the guide rail in the early stage of wear by utilizing the hydraulic oil film sealing effect, continuing to uniformly transmit the load, reducing the impact of the vibration generated in the early stage of ball bearing wear on the stability of the guide system, and extending the service life of other balls and guide rails.

[0015] Meanwhile, by monitoring the consumption of hydraulic oil, the wear condition of the rolling ball can be detected intelligently, and effective early warnings can be issued to inspection personnel so that maintenance can be carried out in a timely manner. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the slider and laser head of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the slider of the present invention; Figure 4 This is a top cross-sectional view of the slider and adjusting groove of the present invention. Figure 5 This is a top view cross-sectional structural diagram of the slider of the present invention; Figure 6 This is a partial front view cross-sectional structural diagram of the connecting pipe of the present invention; Figure 7 This is a partial front view cross-sectional view of the connecting tube after the upper sliding piece slides out of the connecting tube according to the present invention; Figure 8 This is a schematic diagram of the structure of the adjusting plate and the auxiliary mounting groove of the present invention.

[0017] In the diagram: 1. Robotic arm body; 101. Laser head; 2. Mounting plate; 3. Guide rail; 4. Slider; 5. Ball bearing; 6. Cylinder; 7. Connecting pipe; 8. Lower slide plate; 9. Upper slide plate; 10. Through hole; 11. Support rod; 12. Sliding column; 13. Piston rod; 14. Tension spring; 15. Pull ring; 16. Adjustment groove; 17. Main mounting groove; 18. Sealing ring; 19. Adjustment plate; 20. Secondary mounting groove; 21. Screw tube; 22. Screw; 23. Slider; 24. Inclined block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figures 1 to 8 A laser cutting device for excavator frame production includes a robotic arm body 1. A mounting plate 2 is fixedly installed at the end of the robotic arm body 1, i.e., the tool connection port. A guide rail 3 is fixedly installed at the end of the mounting plate 2 away from the robotic arm body 1. A slider 4 is slidably installed at the end of the guide rail 3 away from the mounting plate 2. A groove is provided on the guide rail 3 to limit and slide the slider 4. A laser head 101 is fixedly installed at the end of the slider 4 away from the guide rail 3. The mounting plate 2 and the guide rail 3 are jointly provided with a motor, gearbox, and lead screw for driving the slider 4 to move. This is prior art and will not be described in detail here. When cutting a workpiece, the robotic arm drives the mounting plate 2, guide rail 3, and laser head 101 to move towards the workpiece. The tilt angle of the laser head 101 is adjusted according to the cutting angle requirements. After the laser head 101 moves to the pre-cutting position, the output end of the motor drives the lead screw to rotate, which in turn drives the slider 4, which is threadedly connected to the lead screw, to move under the limiting action of the guide rail 3 until the nozzle of the laser head 101 moves to the final position.

[0020] Two symmetrical adjustment grooves 16 are formed inside the slider 4. One end of the adjustment groove 16 penetrates the side wall of the slider 4. Multiple main mounting grooves 17 are symmetrically formed on both sides of the slider 4, and each main mounting groove 17 is connected to the adjustment groove 16. A sealing ring 18 is fixedly installed on the side of the main mounting groove 17 away from the adjustment groove 16. An adjustment plate 19 is slidably installed inside the adjustment groove 16. Multiple secondary mounting grooves 20 are formed on one side of the adjustment plate 19, and each secondary mounting groove 20 is adapted to the corresponding main mounting groove 17. A ball 5 is rotatably installed inside the secondary mounting groove 20. When assembling the guide rail 3 and the slider 4, the ball 5 is placed in the secondary mounting groove 20. The adjustment plate 19 is inserted into the adjustment groove 16, and then the adjustment plate 19 and the ball 5 are slid towards the main placement groove 17 so that the adjustment plate 19 fits against the inner wall of the adjustment groove 16 and each ball 5 fits against the inner wall of the main placement groove 17. The part of the ball 5 that exceeds the main placement groove 17 protrudes outward through the sealing ring 18 to fit against the guide rail 3. After adjusting the position of the adjustment plate 19, the adjustment plate 19 is fixedly connected to the slider 4 by bolts. Then, the ball 5 is limited by the assembly of the secondary placement groove 20 and the main placement groove 17, and the ball 5 is kept in a closed space by the sealing effect of the sealing ring 18.

[0021] A cylinder 6 is fixedly installed inside the slider 4. The rodless chamber of the cylinder 6 is filled with hydraulic oil. A piston rod 13 is slidably connected to one end of the cylinder 6. The end of the piston rod 13 away from the cylinder 6 moves through the side wall of the slider 4 and is fixedly connected to a pull ring 15. A tension spring 14 is fitted on the outside of the piston rod 13. The two ends of the tension spring 14 are fixedly connected to the side wall of the slider 4 and the pull ring 15, respectively. The elastic force of the tension spring 14 causes the piston rod 13 and the pull ring 15 to move towards the cylinder 6, keeping the hydraulic oil in the rodless chamber of the cylinder 6 under pressure.

[0022] Multiple connecting pipes 7 are fixedly connected to the rodless cavity of the cylinder body 6. The ends of the connecting pipes 7 away from the cylinder body 6 are fixedly connected to the corresponding main mounting slots 17. A lower sliding plate 8 is fixedly installed inside the end of the connecting pipe 7 away from the cylinder body 6. An upper sliding plate 9 is slidably installed above the lower sliding plate 8. The side of the upper sliding plate 9 away from the lower sliding plate 8 is in contact with the ball 5. Both the lower sliding plate 8 and the upper sliding plate 9 have through holes 10 for hydraulic oil to flow through. The through holes 10 on the lower sliding plate 8 and the upper sliding plate 9 are staggered so that when the lower sliding plate 8 and the upper sliding plate 9 are in contact, the lower sliding plate... The through holes 10 on the upper sliding plate 8 and the upper sliding plate 9 are blocked, preventing the hydraulic oil from flowing. The hydraulic oil can only flow when a gap is formed between the lower sliding plate 8 and the upper sliding plate 9. Even if the gap is small, the hydraulic oil can still flow. A sliding column 12 is fixedly installed at the bottom of the upper sliding plate 9. The end of the sliding column 12 away from the upper sliding plate 9 moves through the lower sliding plate 8 and is fixedly installed with a support rod 11. Both ends of the support rod 11 are slidably connected to the inner wall of the connecting pipe 7. Under the limiting action of the support rod 11, the upper sliding plate 9 will not separate from the inside of the connecting pipe 7.

[0023] Initially, after the ball 5 is assembled under the action of the main mounting groove 17, the adjusting plate 19, and the auxiliary mounting groove 20, the unworn ball 5 adheres to the upper sliding plate 9 and limits its movement, causing the lower sliding plate 8 to adhere to the upper sliding plate 9, preventing hydraulic oil from flowing. As the ball 5 is used, it gradually wears down, reducing its volume. Gaps appear between the ball 5 and the main mounting groove 17 and the adjusting plate 19, preventing the ball 5 from limiting the upper sliding plate 9. The hydraulic oil inside the connecting pipe 7 then squeezes the upper sliding plate 9 through the through hole 10 on the lower sliding plate 8, causing the upper sliding plate 9 to slide towards the ball 5. Oil can flow into the main mounting groove 17 and the adjusting plate 19 through the through holes 10 opened on the lower sliding plate 8 and the upper sliding plate 9. Since the main mounting groove 17, the sealing ring 18 and the adjusting plate 19 together form a sealed space for the ball 5, the hydraulic oil entering the main mounting groove 17 is not easy to overflow. This fills the gaps in the main mounting groove 17 and the adjusting plate 19 caused by the wear of the ball 5. In the early stage of wear, the ball 5 can roll normally with the guide rail 3 by utilizing the hydraulic oil film sealing effect, reducing the probability of the vibration generated in the early stage of wear of the ball 5 affecting the stability of the guide system and extending the service life of other balls 5 and guide rail 3.

[0024] A screw tube 21 is fixedly installed on the top of the pull ring 15. A screw rod 22 is threadedly connected to the end of the screw tube 21 near the slider 4. A ball joint 23 is rotatably installed on the end of the screw rod 22 away from the screw tube 21. An inclined block 24 is slidably installed on the upper limit of the side wall of the slider 4. The inclined block 24 is set in a right-angled triangle, with the inclined surface of the inclined block 24 facing the ball joint 23. After the ball joint 5 is installed and positioned by the main mounting groove 17, the sealing ring 18 and the adjusting plate 19, the hydraulic oil in the rodless chamber of the cylinder 6 cannot flow and remains stable because the ball joint 5 blocks the connecting pipe 7. Under the elastic force of the tension spring 14, the initial position of the pull ring 15 also remains stable. At this time, the screw rod 22 is rotated to adjust the ball joint 23 to be as close as possible to the inclined surface of the inclined block 24. When the roller ball 5 wears down, causing a loss of hydraulic oil in the rodless chamber of the cylinder 6, the pull ring 15 and piston rod 13 will slide towards the slider 4 under the action of the tension spring 14, and drive the solenoid 21, screw 22 and pull ball 23 to move synchronously. The pull ball 23 squeezes the inclined block 24 through the inclined surface, causing the inclined block 24 to slide. By setting the length ratio of the two right-angled sides of the inclined block 24, the sliding distance of the inclined block 24 can be changed to enlarge the short path of the pull ring 15. This makes it easier for the operator to judge the amount of hydraulic oil used in the rodless chamber of the cylinder 6 by the displacement change of the inclined block 24, so as to judge the wear degree of the roller ball 5, or to trigger the alarm by the movement of the inclined block 24, so as to provide a warning to the operator through the controller.

[0025] Working principle: When the workpiece needs to be cut, the robotic arm drives the mounting plate 2, guide rail 3 and laser head 101 to move toward the workpiece and adjusts the tilt angle of the laser head 101 according to the cutting angle requirements. After the laser head 101 moves to the pre-cutting position, the output end of the motor drives the lead screw to rotate, and then the slider 4 connected to the lead screw moves under the limiting action of the guide rail 3 until the nozzle of the laser head 101 moves to the final position. In the initial state, after the ball 5 is assembled under the action of the main mounting groove 17, the adjusting plate 19, and the auxiliary mounting groove 20, the unworn ball 5 adheres to the upper sliding plate 9 and limits the upper sliding plate 9, so that the lower sliding plate 8 adheres to the upper sliding plate 9, the hydraulic oil cannot flow, and the hydraulic oil in the rodless chamber of the cylinder body 6 cannot flow and remains stable. Under the elastic force of the tension spring 14, the initial position of the pull ring 15 also remains stable. As the ball 5 is used, when the ball 5 gradually wears down, the volume of the ball 5 decreases, and gaps will appear between the ball 5 and the main mounting groove 17 and the adjusting plate 19, so that the ball 5 can no longer limit the upper sliding plate 9. Under the elastic force of the tension spring 14, the pull ring 15 and the piston rod 13 will slide towards the slider 4 to squeeze the hydraulic oil in the rodless chamber of the cylinder body 6. The hydraulic oil inside the connector 7 squeezes the upper sliding plate 9 through the through hole 10 on the lower sliding plate 8, causing the upper sliding plate 9 to slide towards the ball 5. The hydraulic oil can flow into the main mounting groove 17 and the adjusting plate 19 through the through hole 10 on the lower sliding plate 8 and the upper sliding plate 9. Since the main mounting groove 17, the sealing ring 18 and the adjusting plate 19 together form a sealed space for the ball 5, the hydraulic oil entering the main mounting groove 17 is not easy to overflow. This fills the gap in the main mounting groove 17 and the adjusting plate 19 caused by the wear of the ball 5. In the early stage of wear, the ball 5 can roll normally with the guide rail 3 by using the hydraulic oil film sealing effect, reducing the impact of the vibration generated in the early stage of wear of the ball 5 on the stability of the guide system and extending the service life of other balls 5 and guide rail 3. When the pull ring 15 and piston rod 13 slide toward the slider 4, they will drive the solenoid 21, screw 22 and slider 23 to move synchronously. The slider 23 squeezes the inclined block 24 through the inclined surface, causing the inclined block 24 to slide. By setting the length ratio of the two right-angled sides of the inclined block 24, the sliding distance of the inclined block 24 can be changed to enlarge the short path of the pull ring 15. This makes it easier for the operator to judge the amount of hydraulic oil used in the rodless chamber of the cylinder 6 by the displacement change of the inclined block 24, so as to judge the wear degree of the ball 5, or to trigger the alarm by the movement of the inclined block 24, so as to provide a warning to the operator through the controller.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser cutting device for excavator frame production, comprising a robotic arm body (1), wherein a laser head (101) is slidably mounted at the end of the robotic arm body (1), characterized in that, It also includes a mounting plate (2) fixedly installed at the end of the robotic arm body (1). A guide rail (3) is fixedly installed at the end of the mounting plate (2) away from the robotic arm body (1). The end of the guide rail (3) away from the mounting plate (2) is slidably installed with a slider (4). The end of the slider (4) away from the guide rail (3) is fixedly connected to the laser head (101). Multiple balls (5) are symmetrically rotated on both sides of the slider (4). Multiple main mounting slots (17) are opened on both sides of the slider (4), and each main mounting slot (17) is adapted to the corresponding ball (5). A cylinder (6) is fixedly installed inside the slider (4). The rodless cavity of the cylinder (6) is filled with hydraulic medium. The rodless cavity of the cylinder (6) is fixedly connected to the main mounting slot (17) through a connecting pipe (7). When the ball (5) is worn, the gap between the ball (5) and the main mounting slot (17) is filled by the flow of hydraulic medium in the cylinder (6) and the connecting pipe (7).

2. The laser cutting equipment for excavator frame production according to claim 1, characterized in that, A sliding plate (8) is fixedly installed inside the end of the connecting pipe (7) away from the cylinder (6). An upper sliding plate (9) is slidably installed above the sliding plate (8). The side of the upper sliding plate (9) away from the sliding plate (8) is in contact with the ball (5). Both the sliding plate (8) and the upper sliding plate (9) are provided with through holes (10) for hydraulic oil to flow, and the through holes (10) on the sliding plate (8) and the upper sliding plate (9) are staggered.

3. The laser cutting equipment for excavator frame production according to claim 2, characterized in that, A sliding column (12) is fixedly installed at the bottom of the upper sliding plate (9). The end of the sliding column (12) away from the upper sliding plate (9) passes through the lower sliding plate (8) and is fixedly installed with a support rod (11). Both ends of the support rod (11) are slidably connected to the inner wall of the connecting pipe (7).

4. The laser cutting equipment for excavator frame production according to claim 3, characterized in that, A piston rod (13) is slidably connected to one end of the cylinder (6). The end of the piston rod (13) away from the cylinder (6) moves through the side wall of the slider (4) and is fixedly connected to a pull ring (15). A tension spring (14) is fitted on the outside of the piston rod (13). The two ends of the tension spring (14) are fixedly connected to the side wall of the slider (4) and the pull ring (15) respectively. The elastic force of the tension spring (14) causes the piston rod (13) to squeeze the hydraulic medium in the cylinder (6).

5. The laser cutting equipment for excavator frame production according to claim 4, characterized in that, The slider (4) has two symmetrical adjustment grooves (16) inside. One end of the adjustment groove (16) penetrates the side wall of the slider (4), and each main mounting groove (17) is connected to the adjustment groove (16). A sealing ring (18) is fixedly installed on the side of the main mounting groove (17) away from the adjustment groove (16).

6. The laser cutting equipment for excavator frame production according to claim 5, characterized in that, An adjustment plate (19) is slidably installed inside the adjustment groove (16). A plurality of secondary placement grooves (20) are opened on one side of the adjustment plate (19), and each secondary placement groove (20) is adapted to the corresponding main placement groove (17).

7. The laser cutting equipment for excavator frame production according to claim 6, characterized in that, The top of the pull ring (15) is fixedly installed with a screw tube (21), and a screw rod (22) is threadedly connected to one end of the screw tube (21) near the slider (4). A slider ball (23) is rotatably installed at the other end of the screw rod (22) away from the screw tube (21). An inclined block (24) is slidably installed on the upper limit of the side wall of the slider (4).

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