A high-precision laser cutting device based on a composite connecting rod

Abstract

The application provides a high-precision laser cutting device based on a composite connecting rod, comprising: a fixed base; a driving device installed on the fixed base; a motion rocker, one end of which is in transmission connection with the driving device; a motion connecting rod, one end of which is hingedly connected to the other end of the motion rocker; and a connecting rod mechanism, one end of which is installed on the fixed base, and the other end of which is hingedly connected to the other end of the motion connecting rod at a common rotation point, for offset installation of a laser cutting head. The high-precision laser cutting device based on the composite connecting rod can realize offset installation of the laser cutting head through the composite connecting rod structure, can be compatible with laser cutting heads of different sizes, and can ensure the cutting precision of the device.

Description

Technical Field

[0001] This application relates to the field of laser cutting equipment technology, and in particular to a high-precision laser cutting device based on a composite linkage. Background Technology

[0002] In the field of laser cutting technology, the demand for small-trajectory, high-precision cutting is growing, especially in precision industries such as electronics manufacturing and medical devices. Currently, the commonly used multi-axis linkage motion mechanisms, such as XYZ three-axis linear motion mechanisms or hybrid mechanisms with rotary axes, still have a series of limitations in practical applications, which restrict their performance in high-precision micromachining (technology for processing tiny parts or micron-level features).

[0003] In existing equipment, the cutting head is usually directly fixed to the end of the motion platform, making it difficult to adapt to cutting heads of different sizes or models, especially with poor compatibility with domestically produced components. At the same time, the accumulation of errors in multi-axis transmission leads to low accuracy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this application is to provide a high-precision laser cutting device based on a composite linkage, which is compatible with laser cutting heads of different sizes and is suitable for small-trajectory, high-precision laser processing applications.

[0005] To achieve the above objectives, the high-precision laser cutting device based on a composite linkage provided in this application includes: Fixed base; A driving device, which is mounted on the fixed base; A motion rocker arm, one end of which is connected to the drive device for transmission. A motion link, one end of which is hinged to the other end of the motion rocker; A linkage mechanism, one end of which is mounted on the fixed base, and the other end of which is hinged to the other end of the moving link at a common rotation point, is used for offset mounting of the laser cutting head.

[0006] Furthermore, the fixed base is provided with positioning holes and fixing grooves for mounting the drive device.

[0007] Furthermore, the driving device includes a first driving device and a second driving device, which are symmetrically mounted on the fixed base. The motion rocker includes a first motion rocker and a second motion rocker. The first motion rocker is connected to the first driving device, and one end of the second motion rocker is connected to the second driving device. The motion link includes a first motion link and a second motion link. One end of the first motion link is hinged to the other end of the first motion rocker, and one end of the second motion link is hinged to the other end of the second motion rocker. The other ends of the first motion link and the second motion link are hinged at a point.

[0008] Furthermore, the linkage mechanism includes: a mounting base, a first link, a second link, a third link, and a fourth link that are connected in sequence by hinges; The mounting base is fixed on the fixed base and hinged to one end of the first connecting rod; The fourth link is hinged at the common rotation point, and the fourth link is fixedly connected to the laser cutting head; The second link is an integral angle connecting rod or a composite fixed angle connecting rod, and its bending center is hinged at a point to one of the moving rockers and its connected moving link; The lengths of the first link, the second link, the third link, and the fourth link satisfy the following conditions: the first equivalent link is parallel to the second equivalent link and has the same length; the third equivalent link is parallel to the fourth equivalent link and has the same length; wherein the first equivalent link is located between the two rotation points of the first link, the second equivalent link is located between the two rotation points of the rocker arm, the third equivalent link is located between the two rotation points of the third link, and the fourth equivalent link is located between the two rotation points of the rocker arm connected to the rocker arm.

[0009] Furthermore, the fourth link is a straight link, with one end hinged to the third link and the other end hinged at the common rotation point; The laser cutting head is fixedly connected to the straight connecting rod, so that the angle between the line connecting the center of the laser cutting head and the common rotation point and the longitudinal axis centerline of the straight connecting rod remains unchanged.

[0010] Furthermore, the drive device adopts a servo motor; the servo motor is equipped with a high-precision encoder for real-time feedback of the motor's rotation angle.

[0011] Furthermore, the drive device adopts a servo motor and is equipped with a reduction mechanism for reducing the motor speed and increasing the output torque. The output shaft of the reduction mechanism is connected to one end of the motion rocker.

[0012] Furthermore, the deceleration mechanism employs a harmonic reducer.

[0013] Furthermore, the servo motor is equipped with an encoder for real-time feedback of the motor rotation angle to achieve closed-loop control.

[0014] The high-precision laser cutting device based on a composite link provided in this application achieves offset installation of the laser cutting head through the composite link structure, which can be compatible with laser cutting heads of different sizes while ensuring the cutting accuracy of the device.

[0015] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this application. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present application and form part of the specification. Together with the embodiments of the present application, they serve to explain the present application but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of a high-precision laser cutting device based on a composite linkage according to an embodiment of this application; Figure 2 This is a three-dimensional structural diagram of the motion rocker and motion link according to an embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the linkage mechanism according to an embodiment of this application; Figure 4 This is a schematic diagram illustrating that the linkage mechanism according to an embodiment of this application satisfies the parallelogram condition; Figure 5 This is a schematic diagram illustrating the principle of direct offset mounting of a laser cutting head using a linkageless mechanism according to an embodiment of this application; Figure 6 This is a schematic diagram showing the distance between the actual laser cutting center point and the center of the cutting mechanism according to an embodiment of this application; Figure 7 This is a schematic diagram illustrating the principle of offset mounting of the laser cutting head after adding a linkage mechanism according to an embodiment of this application.

[0017] Figure label: 1-Fixed base; 2-Drive device; 3-Motion rocker arm; 4-Motion link; 5-Linkage mechanism; 6-Laser cutting head; 7-Common rotation point; 8-Bending center; 9-Laser cutting center; 10-Actual laser cutting center point; 21-First drive device; 22-Second drive device; 31-First motion rocker arm; 32-Second motion rocker arm; 41-First motion link; 42-Second motion link; 51-First link; 52-Second link; 53-Third link; 54-Fourth link; 55-Mounting base. Detailed Implementation

[0018] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0019] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0020] The term "comprising" and its variations as used in this application are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; and the term "some embodiments" means "at least some embodiments".

[0021] It should be noted that the terms "first" and "second" may be used in this application only to distinguish different devices, components or parts, and are not used to define the order of functions performed by these devices, components or parts or their interdependence.

[0022] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be interpreted as "one or more". "A plurality of" should be understood as two or more. Definitions of other terms will be given in the following description.

[0023] The high-precision laser cutting device based on a composite linkage of this application includes: a fixed base; a driving device mounted on the fixed base; a motion rocker arm, one end of which is connected to the driving device; a motion link, one end of which is hinged to the other end of the motion rocker arm; and a linkage mechanism, one end of which is mounted on the fixed base, and the other end of which is hinged to the other end of the motion link at a common rotation point for offset mounting of the laser cutting head.

[0024] Figure 1 The above is a three-dimensional structural diagram of a high-precision laser cutting device based on a composite linkage according to an embodiment of this application. To make the objectives, technical solutions, and advantages of this application clearer, reference will be made below. Figure 1 The specific embodiments of this application will be described in further detail.

[0025] The high-precision laser cutting device based on a composite linkage according to this application embodiment includes a fixed base 1, a driving device 2, a motion rocker arm 3, a motion connecting rod 4, a linkage mechanism 5, and a laser cutting head 6. The fixed base 1 has positioning holes and fixing slots for mounting the driving device 2. One end of the motion rocker arm 3 is connected to the driving device 2. One end of the motion connecting rod 4 is hinged to the other end of the motion rocker arm 3, and the other end of the motion connecting rod 4 is hinged to one end of the linkage mechanism 5 at a common rotation point 7. The motion connecting rod 4 is used to synthesize and transmit the swing motion of the motion rocker arm 3 to this common rotation point 7. The other end of the linkage mechanism 5 is fixedly mounted on the fixed base 1. The linkage mechanism 5 is used to offset the laser cutting head 6, shifting the laser cutting center from the common rotation point 7 to the center of the laser cutting head 6 to meet the installation requirements of laser cutting heads of different sizes.

[0026] Composite linkage: refers to a mechanical system composed of multiple links connected by hinge points, capable of achieving complex motion trajectories. In this application, "composite linkage" specifically refers to a mechanism composed of a rocker arm 3, a link 4, and a linkage mechanism 5, used for transmitting and synthesizing motion.

[0027] Hinged connection: refers to the connection between two components via a pin or bearing, allowing them to rotate relative to each other within a certain range. The term "hinged connection" is used multiple times in this application to indicate a rotatable connection between a link and a rocker arm, or between links.

[0028] Linkage mechanism: A mechanism consisting of five links connected by hinge points, used in this application to offset the laser cutting head 6 relative to a common rotation point 7 and maintain its stable posture to achieve complex planar motion.

[0029] Common rotation point: refers to a point where multiple links are hinged together, and the motion of this point is synthesized from multiple inputs. In this application, the other end of the motion link 4 is hinged to the common rotation point, and the linkage mechanism 5 is also connected to this point.

[0030] Laser cutting head: The core component of laser processing equipment, which usually includes a focusing lens, nozzle, sensor, etc., is used to focus the laser beam and guide it to the surface of the workpiece for cutting.

[0031] Figure 2 This is a schematic diagram of the motion rocker and motion linkage structure according to an embodiment of this application, as shown below. Figure 2As shown, the drive device 2 includes a first drive device 21 and a second drive device 22, symmetrically mounted on both sides of the front of the fixed base 1. The motion rocker arm 3 includes a first motion rocker arm 31 and a second motion rocker arm 32. The motion link 4 includes a first motion link 41 and a second motion link 42. One end of the first motion rocker arm 31 is connected to the output shaft of the first drive device 21, and the other end is hinged to one end of the first motion link 41. One end of the second motion rocker arm 32 is connected to the output shaft of the second drive device 22, and the other end is hinged to one end of the second motion link 42. The other ends of the first motion link 41 and the second motion link 42 are hinged to each other at a common rotation point 7.

[0032] In the embodiments of this application, the fixed base 1 serves as the mounting foundation for the entire device, supporting components such as the drive device 2 and the motion rocker arm 3. It is made of high-strength aluminum alloy and undergoes precision machining to ensure flatness and perpendicularity, guaranteeing the positional accuracy of each component after installation and preventing deformation or vibration of the base from affecting cutting accuracy. The fixed base 1 is provided with positioning holes and fixing grooves for mounting the drive device 2, ensuring the stability and positional accuracy of the drive device 2 after installation.

[0033] Positioning holes and fixing slots: Mechanical structures used in this application for precise positioning and fixing of components, ensuring accurate installation and avoiding the impact of installation errors on overall accuracy.

[0034] In the embodiments of this application, both the first driving device 21 and the second driving device 22 are high-precision servo motors. The rated torque of the servo motor is calculated and determined based on the weight of the motion rocker arm 3 and the motion connecting rod 4, as well as the driving force required during the cutting process. Its positioning accuracy can reach ±0.001°, and its repeatability positioning accuracy can reach ±0.0005°. Furthermore, each servo motor is equipped with a high-precision encoder (such as a high-resolution absolute optical encoder), which can provide real-time feedback on the motor's rotation angle, realize closed-loop control, and further improve the driving accuracy.

[0035] Encoder: A sensor used to measure rotational or linear position. The high-precision encoder in this application features high resolution and low error, and is used to provide real-time feedback of the motor's rotation angle, enabling precise position control.

[0036] Servo motor: A type of electric motor capable of precisely controlling position, speed, or torque. Equipped with a high-precision encoder, it achieves closed-loop control and is suitable for high-precision motion control applications. In the embodiments of this application, the first drive device 21 and the second drive device 22 are respectively provided with a reduction mechanism (such as a high-precision harmonic reducer). The reduction ratio is set according to the actual motion requirements to reduce the motor speed, increase the output torque, and simultaneously reduce vibration during motor rotation, ensuring smooth drive operation. The first motion rocker arm 31 and the second motion rocker arm 32 are respectively connected to the output shaft of the reduction mechanism.

[0037] Harmonic reducer: A high-precision, high-torque speed reduction device that transmits motion through elastic deformation. It features a high reduction ratio, zero backlash, and compact structure, and is commonly used in robots and precision instruments.

[0038] In the embodiments of this application, the motion rocker 3 is made of high-strength aluminum alloy, and its cross-sectional shape is designed as a rectangle to reduce weight and motion inertia while ensuring strength, thereby improving motion response speed. The length of the motion rocker 3 is determined according to the range of the required cutting trajectory, and the connecting holes at both ends are precision drilled and reamed, with the hole diameter tolerance controlled at H7 level to ensure the connection accuracy with the output shaft of the drive device 2 and the motion linkage 4.

[0039] In the embodiments of this application, the material of the motion link 4 is the same as that of the motion rocker 3, both being high-strength aluminum alloy. The length is determined based on the length of the motion rocker 3 and the range of the required cutting trajectory. The hinges between the motion link 4 and the motion rocker 3, and between the motion links 4 themselves, are precision bearing hinges, with radial clearance controlled at 0.001-0.003 mm to reduce clearance at the hinge and improve rotational accuracy. Simultaneously, the pin at the hinge is made of high-strength steel, hardened to improve surface hardness, with the pin diameter tolerance controlled at h6 level and the surface roughness controlled below Ra0.4 μm to ensure smooth rotation and wear resistance at the hinge.

[0040] Figure 3 This is a schematic diagram of a linkage mechanism according to an embodiment of this application, as shown below. Figure 3As shown, the linkage mechanism 5 includes a first link 51, a second link 52, a third link 53, a fourth link 54, and a mounting base 55. The mounting base 55 is fixedly installed on the side of the fixed base 1. One end of the first link 51 is hinged to the mounting base 55, the other end of the first link 51 is hinged to one end of the second link 52, the other end of the second link 52 is hinged to one end of the third link 53, the other end of the third link 53 is hinged to one end of the fourth link 54, and the other end of the fourth link 54 is hinged at the common rotation point 7 of the first moving link 41 and the second moving link 42. Simultaneously, a laser cutting head 6 is fixedly installed at the other end of the fourth link 54 in any direction and at any distance, so that the angle between this direction and the line connecting the two rotation points of the fourth link 54 remains constant during the cutting process. The second link 52 is an integral angle connecting rod or a composite fixed angle connecting rod, and its bending center 8 is hinged at a point to the first moving rocker arm 31 and the first moving link 41. This integrated angle connecting rod or composite fixed angle connecting rod has a first arm and a second arm with a fixed included angle. The first arm is hinged to the first connecting rod 51, and the second arm is hinged to the third connecting rod 53. The length and included angle of the first and second arms are set according to actual needs. In the embodiments of this application, the lengths of the first connecting rod 51, the second connecting rod 52, the third connecting rod 53, and the fourth connecting rod 54 satisfy the parallelogram condition to ensure the stability of the laser cutting head 6 during movement.

[0041] Figure 4 The following is a schematic diagram illustrating that the linkage mechanism according to an embodiment of this application satisfies the parallelogram condition. Figure 4 The parallelogram condition for multiple links in linkage mechanism 5 is explained in detail. Figure 4 In the diagram, 'a' represents the equivalent link between the two rotation points of the first link 51, 'b' represents the equivalent link between the rotation point of the first link 51 located on the mounting base 55 side and the fixed rotation point of the first moving rocker arm 31, 'c' represents the equivalent link between the two rotation points of the first moving rocker arm 31, 'd' represents the equivalent link between the rotation point at the end of the first arm of the second link 52 and the bending center 8, 'e' represents the equivalent link between the rotation point at the end of the second arm of the second link 52 and the bending center 8, 'f' represents the equivalent link between the two rotation points of the first moving link 41, 'g' represents the equivalent link between the two rotation points of the fourth link 54, 'h' represents the equivalent link between the two rotation points of the third link 53, 'i' represents the equivalent link between the laser cutting center 9 and the common rotation point 7 (original cutting center), 'k' represents the equivalent link between the two fixed rotation points of the moving rocker arm 3, 'l' represents the equivalent link between the two rotation points of the second moving rocker arm 32, and 'm' represents the equivalent link between the two rotation points of the second moving link 42.

[0042] Equivalent Link: In the mechanism principle analysis of this application, in order to simplify calculation or understanding, the complex linkage mechanism is abstracted into several geometric links, whose length and angle relationship represents the motion characteristics of the actual mechanism.

[0043] Rotation point: also known as hinge point or rotation center, refers to the spatial position in a mechanism where two or more components are connected to a point by a hinge and can rotate relative to that point. In this application, the rotation point on the first motion rocker 31 located at the output end of the first drive device 21 is a fixed rotation point because the spatial position of this rotation point is fixed, while the rotation point at the other end of the first motion rocker 31 will change position.

[0044] Bending center: This is the geometric inflection point of an angled connecting rod (such as an L-shaped or V-shaped connecting rod), i.e., the theoretical position where the two arms intersect. The integral angled connecting rod in this application refers to a connecting rod integrally formed with a fixed included angle between its two arms; the composite fixed-angle connecting rod in this application is a specially designed connecting rod in which a fixed and unchangeable angle is maintained between its two arms, achieved through a rigid structure or assembly, used for precisely transmitting motion and maintaining specific geometric relationships.

[0045] like Figure 4 As shown, by setting the lengths of each link in the linkage mechanism 5, two parallelograms abcd and efgh are formed between the linkage mechanism 5 and the first moving rocker arm 31 and the first moving link 41, where a and c are parallel and equal, and h and f are parallel and equal. Since the positions of b and k are fixed, the two parallelograms abcd and efgh will always be in the shape of parallelograms during the movement of the first moving rocker arm 31 and the first moving link 41. The angle between d and e is fixed, and the angle between the equivalent link i and g is fixed (the laser cutting head 6 is fixedly connected to the fourth link 54). According to geometric principles, the angle between the equivalent link i and k remains constant. Therefore, the laser cutting center 9 will not rotate relative to the common rotation point 7, thus ensuring that the movement trajectory of the offset laser cutting center 9 is exactly the same as the movement trajectory of the common rotation point 7.

[0046] Figure 5 This is a schematic diagram illustrating the principle of direct offset mounting of a laser cutting head using a linkageless mechanism according to an embodiment of this application. Figure 6 This is a schematic diagram showing the distance between the actual laser cutting center point and the center of the cutting mechanism according to an embodiment of this application. Figure 7 The following is a schematic diagram illustrating the principle of offset mounting of the laser cutting head after adding a linkage mechanism according to an embodiment of this application. (Refer to the following...) Figures 5 to 7 The beneficial effects of using a linkage mechanism in the embodiments of this application are further explained.

[0047] Without adding linkage mechanism 5, the laser cutting head 6 is directly offset from the center of the original small trajectory cutting mechanism (coinciding with the common rotation point 7). Specifically, the laser cutting center 9 is offset from the common rotation point 7 via equivalent linkage i. At this time, equivalent linkage i is connected to equivalent linkage f. During the movement of the small trajectory cutting assembly (including the moving rocker 3 and the moving linkage 4), the equivalent linkage f will have an angle change relative to the equivalent linkage k, while the equivalent linkage i and equivalent linkage f are relatively stationary. Therefore, during the movement, the equivalent linkage i will have an angle change relative to the equivalent linkage k, meaning the laser cutting center 9 will have an angle change relative to the common rotation point 7. The turning point 7 has relative rotational motion. The actual laser cutting center point 10's motion trajectory is a combination of the motion trajectory of the center of the small trajectory cutting mechanism and the rotational motion trajectory of the laser cutting head 6 itself. However, there is a certain distance (e.g., 948mm) between the actual laser cutting center point 10 and the center of the small trajectory cutting mechanism in the vertical direction. Due to processing and assembly errors, the actual laser cutting center point 10 on the laser cutting head 6 is not perpendicular to the cutting surface. At the same time, there is also an error between the center of the laser spot and the actual laser cutting center point 10. Thus, the laser cutting center 9 will deviate during rotational motion, causing the cutting accuracy to exceed the tolerance.

[0048] To address the aforementioned deviation issue, the laser cutting center 9 is offset from the common rotation point 7 via an equivalent link i. Simultaneously, a link mechanism 5 is added to form a, b, d, e, h, g, where b and k are fixed, and a, b, c, and d are parallelograms. During the movement, b and d remain parallel, and f, g, h, and e are also parallelograms. During the movement, e and g remain parallel, the angle between d and e is fixed (e.g., 90°), and the angle between i and g is fixed (e.g., 75°). Therefore, the angle between i and k is fixed during the movement, meaning that the laser cutting center 9 has no relative rotational motion to the common rotation point 7. The actual laser cutting center point 10's movement trajectory is the offset of the small trajectory cutting mechanism's center movement trajectory. Even if the actual laser cutting center point 10 and the center of the small trajectory cutting mechanism are a certain distance in the vertical direction (e.g., 948mm), the actual laser cutting center point 10 located at the center of the laser cutting head 6 is not perpendicular to the cutting surface due to processing and assembly errors. At the same time, the laser spot center also has an error with the actual laser cutting center point 10. As long as the small trajectory cutting mechanism's precision is qualified, the trajectory will only be offset but will not cause the cutting precision to exceed the tolerance.

[0049] Cutting accuracy: refers to the deviation between the actual movement path of the laser cutting head and the theoretical path.

[0050] In the embodiments of this application, each link of the linkage mechanism 5 is made of high-strength aluminum alloy and is precision machined to ensure dimensional accuracy and geometric tolerances. The design of the linkage mechanism 5 allows for setting the length of each link according to actual needs, enabling the laser cutting head 6 to be offset and installed in different directions and at different distances to accommodate laser cutting heads 6 of different sizes.

[0051] In the embodiments of this application, the fourth link 54 is a straight link, with one end hinged to the third link 53 and the other end hinged at the common rotation point 7. The laser cutting head 6 is rigidly connected to this straight link, so that the angle between the line connecting the center of the laser cutting head 6 and the common rotation point 7 and the longitudinal axis centerline of the straight link remains fixed. It can be understood that, to achieve this structure, the fourth link 54 can also be an angled link, with one arm forming an equivalent link g and the other arm forming an equivalent link i.

[0052] The high-precision laser cutting device based on a composite linkage provided in this application has the following significant advantages: (1) Compact structure: The composite linkage structure of "two rockers + two connecting rods + five connecting rods" is adopted. Compared with the multi-axis linkage mechanism, the number of parts is greatly reduced, the overall structure is more compact, occupies less space, and is easy to install and integrate in a small space. At the same time, the overall weight of the device is reduced and the portability of the device is improved.

[0053] (2) Ensure basic cutting accuracy: By selecting high-precision servo motors, precision reducers, micro bearings, and high-strength precision-machined motion linkages 4 and motion rockers 3, the manufacturing errors and transmission gaps of each moving part are reduced; the laser cutting head offset installation is realized through the linkage mechanism 5, and the linkage mechanism 5 that meets the parallelogram condition avoids the problem of error accumulation in multi-axis linkage.

[0054] (3) Fast response speed: Both the motion rocker 3 and the motion link 4 are made of lightweight and high-strength materials, which reduces inertia; the motion transmission path of the composite link structure is short, and the power of the drive device 2 can be quickly transmitted to the laser cutting head 6 without obvious motion lag. When performing small trajectory cutting, the cutting efficiency is greatly improved.

[0055] (4) Low maintenance cost: The "two rocker arms + two connecting rods + five connecting rods" structure has fewer parts and the connection method of each moving part is simple. There is no complicated guide rail transmission structure, which reduces the number of easily worn parts. During long-term use, only the bearings and pins at the hinge need to be lubricated and maintained periodically. There is no need to replace parts frequently, which reduces maintenance costs.

[0056] (5) Flexible motion trajectory: By controlling the rotation angle and speed of the drive device 2, the laser cutting head 6 can achieve various small trajectory movements, such as circular (diameter range from 1mm to 40mm), elliptical, straight line segment, and arc segment combination trajectory, which are suitable for high-precision small-scale cutting operations. It can adapt to different cutting needs without changing the mechanism components, thus improving the versatility of the device.

[0057] (6) The cutting head is highly compatible and low in cost: The offset design of the linkage mechanism 5 breaks the limitation on the size of the cutting head, and is compatible with domestic laser cutting heads of different sizes. It does not need to rely on imported cutting heads, and the procurement cost is greatly reduced. At the same time, the offset installation method also facilitates the disassembly, replacement and maintenance of the cutting head, further reducing the cost of use.

[0058] It will be understood by those skilled in the art that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-precision laser cutting device based on a composite linkage, characterized in that, include: Fixed base; A driving device, which is mounted on the fixed base; A motion rocker arm, one end of which is connected to the drive device for transmission. A motion link, one end of which is hinged to the other end of the motion rocker; A linkage mechanism, one end of which is mounted on the fixed base, and the other end of which is hinged to the other end of the moving link at a common rotation point, is used for offset mounting of the laser cutting head.

2. The high-precision laser cutting device based on a composite linkage according to claim 1, characterized in that, The fixed base is provided with positioning holes and fixing grooves for mounting the drive device.

3. The high-precision laser cutting device based on a composite linkage according to claim 1, characterized in that, The driving device includes a first driving device and a second driving device, which are symmetrically mounted on the fixed base. The motion rocker includes a first motion rocker and a second motion rocker. The first motion rocker is connected to the first driving device, and one end of the second motion rocker is connected to the second driving device. The motion link includes a first motion link and a second motion link. One end of the first motion link is hinged to the other end of the first motion rocker, and one end of the second motion link is hinged to the other end of the second motion rocker. The other ends of the first motion link and the second motion link are hinged at a point.

4. The high-precision laser cutting device based on a composite linkage according to claim 1, characterized in that, The linkage mechanism includes: a mounting base, a first link, a second link, a third link, and a fourth link that are connected in sequence by hinges; The mounting base is fixed on the fixed base and hinged to one end of the first connecting rod; The fourth link is hinged at the common rotation point, and the fourth link is fixedly connected to the laser cutting head; The second link is an integral angle connecting rod or a composite fixed angle connecting rod, and its bending center is hinged at a point to one of the moving rockers and its connected moving link; The lengths of the first link, the second link, the third link, and the fourth link satisfy the following conditions: the first equivalent link is parallel to the second equivalent link and has the same length; the third equivalent link is parallel to the fourth equivalent link and has the same length; wherein the first equivalent link is located between the two rotation points of the first link, the second equivalent link is located between the two rotation points of the rocker arm, the third equivalent link is located between the two rotation points of the third link, and the fourth equivalent link is located between the two rotation points of the rocker arm connected to the rocker arm.

5. The high-precision laser cutting device based on a composite linkage according to claim 4, characterized in that, The fourth link is a straight link, with one end hinged to the third link and the other end hinged at the common rotation point; The laser cutting head is fixedly connected to the straight connecting rod, so that the angle between the line connecting the center of the laser cutting head and the common rotation point and the longitudinal axis centerline of the straight connecting rod remains unchanged.

6. The high-precision laser cutting device based on a composite linkage according to claim 1, characterized in that, The drive device uses a servo motor; the servo motor is equipped with a high-precision encoder for real-time feedback of the motor's rotation angle.

7. The high-precision laser cutting device based on a composite linkage according to claim 1, characterized in that, The drive device uses a servo motor and is equipped with a speed reduction mechanism to reduce the motor speed and increase the output torque. The output shaft of the speed reduction mechanism is connected to one end of the motion rocker.

8. The high-precision laser cutting device based on a composite linkage according to claim 7, characterized in that, The deceleration mechanism uses a harmonic reducer.

9. The high-precision laser cutting device based on a composite linkage according to claim 7, characterized in that, The servo motor is equipped with an encoder for real-time feedback of the motor rotation angle to achieve closed-loop control.

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