Laser cutting air suspension device

Abstract

The present invention discloses a laser cutting gas suspension device, comprising: a gas suspension platform, a magnetic field generating unit, a suspension positioning unit, and a feedback and control system; the suspension positioning unit comprises a constraint and a permanent magnet, the permanent magnet is fixedly connected to the suspension positioning unit, the gas suspension platform is used to suspend the suspension positioning unit and the workpiece fixed thereto, the magnetic field generating unit is used to generate a control magnetic field that interacts with the permanent magnet, and the feedback and control system comprises a sensor for monitoring the posture of the suspension positioning unit and / or the workpiece, and a controller for controlling the magnetic field generating unit. The embodiment of the present invention utilizes a combination of gas suspension and magnetic field drive to enable the thrust coil to interact with the permanent magnet in the suspension positioning unit to generate additional control force, effectively counteract the influence of airflow imbalance, realize non-contact support and positioning of the workpiece, and ensure that the workpiece can still maintain the stability of the suspension state under airflow fluctuations or other external disturbances.

Description

Technical Field

[0001] The present invention relates to the field of air suspension devices, in particular to a laser cutting air suspension device. Background Art

[0002] Traditional gas suspension devices often struggle to maintain a balanced airflow when processing irregularly shaped workpieces, which results in insufficient workpiece stability during laser cutting. Due to the uneven airflow, the workpiece is prone to horizontal displacement during the suspension process, affecting cutting accuracy.

[0003] To overcome this problem, it is usually necessary to use an additional fixed bracket or clamp to apply force to the workpiece in the horizontal direction to prevent the workpiece from moving in the horizontal plane.

[0004] However, this fixation method has many limitations.

[0005] First, existing fixed brackets often lack sufficient flexibility to accommodate workpieces of varying shapes and sizes. For complex workpieces, traditional bracket designs cannot provide effective support and positioning, potentially causing the workpiece to shift or vibrate during cutting.

[0006] Secondly, since the stability of the workpiece depends on physical contact, this contact can easily cause the workpiece to vibrate under the disturbance of airflow. The vibration will not only reduce the cutting accuracy, but also accelerate the wear of the fixed bracket, affecting the service life and maintenance cost of the equipment. Summary of the Invention

[0007] The purpose of the present invention is to provide an air suspension device for laser cutting to solve the problems that traditional fixed brackets lack sufficient flexibility and are difficult to adapt to workpieces of different shapes and sizes. In addition, the stability of the workpiece in air suspension depends on physical contact with the fixed bracket, which can easily cause vibration of the workpiece under the disturbance of airflow, reduce cutting accuracy, and accelerate the wear of the fixed bracket.

[0008] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0009] The present invention provides a laser cutting air suspension device, comprising: an air suspension platform, a magnetic field generating unit, a suspension positioning unit, and a feedback and control system. The suspension positioning unit comprises a constraint and a permanent magnet, the constraint being used to restrict movement of a workpiece, and the permanent magnet being fixedly connected to the suspension positioning unit. The air suspension platform is provided with a plurality of air jet holes, the air jet holes being used to inject airflow so that the suspension positioning unit and the workpiece fixed thereto are suspended above the air suspension platform. The magnetic field generating unit is used to generate a control magnetic field on the air suspension platform that interacts with the permanent magnet, the control magnetic field being used to exert a driving force on the permanent magnet to offset the horizontal force exerted by the airflow on the workpiece, and to offset the difference between the weight of the workpiece and the buoyancy exerted by the airflow on the workpiece. The feedback and control system comprises a sensor for monitoring the posture of the suspension positioning unit and / or the workpiece, and a controller for controlling the magnetic field generating unit. The controller adjusts the control magnetic field generated by the magnetic field generating unit in real time based on information fed back by the sensor to ensure the stability of the workpiece in the suspension state.

[0010] Furthermore, the magnetic field generating unit includes an X-direction thrust coil and a Y-direction thrust coil, and the X-direction thrust coil and the Y-direction thrust coil are used to generate a control magnetic field that interacts with the permanent magnet in the X direction and the Y direction, and the X direction and the Y direction are both horizontal directions and perpendicular to each other.

[0011] Furthermore, the magnetic field generating unit also includes a suspension coil, which is used to generate a vertical control magnetic field. The suspension coil is used to provide additional suspension force to the workpiece through the constraint member to reduce the workpiece's dependence on the buoyancy of the airflow from the jet hole, thereby achieving highly stable control of the workpiece.

[0012] Furthermore, the sensor includes an optical sensor, which is installed around the air suspension platform. The optical sensor is used to monitor and provide feedback in real time on the horizontal position, tilt angle and vibration of the suspension positioning unit and / or the workpiece, so as to provide the feedback to the controller to adjust the input current of the X-direction thrust coil, the Y-direction thrust coil and the suspension coil.

[0013] Furthermore, the sensor includes an accelerometer and a gyroscope, which are installed inside the suspension positioning unit and are used to monitor the force, direction, angular velocity and posture of each suspension positioning unit in real time, so as to provide the information to the controller to adjust the input current of the X-direction thrust coil, the Y-direction thrust coil and the suspension coil.

[0014] Furthermore, a plurality of the air injection holes are evenly distributed on the air suspension platform.

[0015] Furthermore, the X-direction thrust coil and the Y-direction thrust coil are arranged around the air jet hole.

[0016] In another aspect of the present invention, the X-direction thrust coils and the Y-direction thrust coils are arranged along a rectangular array and staggered with each other, the air jet holes are arranged between adjacent X-direction thrust coils and the Y-direction thrust coils, and the suspension coils are arranged beside the X-direction thrust coils and the Y-direction thrust coils.

[0017] Furthermore, the plurality of suspension positioning units are fixedly connected to each other via a frame.

[0018] Furthermore, when the workpiece is positioned, the restraining member abuts against the edge of the workpiece from the outside of the workpiece, or the restraining member absorbs the surface of the workpiece from the inside of the workpiece.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] A laser cutting air suspension device is provided. By combining air suspension and magnetic field drive, the thrust coil interacts with the permanent magnet in the suspension positioning unit to generate additional control force, effectively counteracting the impact of airflow imbalance, achieving non-contact support and positioning of the workpiece, and ensuring that the workpiece can maintain the stability of the suspension state under airflow fluctuations or other external disturbances. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0022] Figure 1 A cross-sectional view of the first embodiment of the present invention taken along a vertical plane;

[0023] Figure 2 A top view of the air suspension platform and the magnetic field generating unit according to the first embodiment of the present invention;

[0024] Figure 3 A top view of a suspension positioning unit according to a first embodiment of the present invention;

[0025] Figure 4 is a cross-sectional view taken along a vertical plane of a second embodiment of the present invention;

[0026] Figure 5 A top view of an air suspension platform and a magnetic field generating unit according to a second embodiment of the present invention;

[0027] Figure 6 A top view of an air suspension platform and a magnetic field generating unit according to a third embodiment of the present invention;

[0028] The numbers in the figure represent the following:

[0029] 1-air suspension platform; 11-jet hole; 21-X-direction thrust coil; 22-Y-direction thrust coil; 23-suspension coil; 3-suspension positioning unit; 31-constraint; 32-permanent magnet; 4-frame; 5-laser head; 51-laser beam; 6-workpiece. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Existing fixed brackets usually lack sufficient flexibility and are difficult to adapt to workpieces 6 of different shapes and sizes. For workpieces 6 with complex shapes, the design of traditional brackets cannot provide effective support and positioning, which may cause the workpiece 6 to shift or vibrate during the cutting process. Moreover, since the stability of the workpiece 6 depends on physical contact, this contact can easily cause the workpiece 6 to vibrate under the disturbance of airflow, and the vibration will not only reduce the cutting accuracy, but also accelerate the wear of the fixed bracket, affecting the service life and maintenance cost of the equipment.

[0032] Based on the above reasons, this specific embodiment provides a laser cutting air suspension device that can ensure the stability of the workpiece 6 during the laser cutting process without relying on physical contact, while having sufficient flexibility to accommodate workpieces 6 of various shapes and sizes.

[0033] (First embodiment)

[0034] Combine Figure 1 、 Figure 2 The laser cutting air suspension device includes: an air suspension platform 1, a suspension positioning unit 3 and a magnetic field generating unit.

[0035] A plurality of air jet holes 11 are arranged on the air suspension platform 1 , and the air jet holes 11 are used to spray airflow to suspend the suspension positioning unit 3 and the workpiece 6 fixed thereto placed on the air suspension platform 1 .

[0036] The suspension positioning unit 3 includes a restraining member 31 and a permanent magnet 32 ​​. The restraining member 31 is used to restrain the horizontal movement of the workpiece 6 . The permanent magnet 32 ​​is fixedly connected to the bottom of the suspension positioning unit 3 .

[0037] The magnetic field generating unit is used to generate a control magnetic field on the air suspension platform 1 that interacts with the permanent magnet 32 ​​in the suspension positioning unit 3. The control magnetic field is used to apply a driving force to the permanent magnet 32 ​​to offset the horizontal force of the airflow on the workpiece 6, thereby ensuring the stability of the workpiece 6 during the process of the laser beam 51 emitted by the laser head 5 cutting the workpiece 6.

[0038] Among them, the magnetic field generating unit includes an X-direction thrust coil 21 and a Y-direction thrust coil 22. The X-direction and Y-direction are both horizontal directions and perpendicular to each other. The X-direction thrust coil 21 and the Y-direction thrust coil 22 are used to generate a control magnetic field in the X-direction and Y-direction respectively to interact with the permanent magnet 32 ​​in the suspension positioning unit 3. The control magnetic field is used to enable the suspension positioning unit 3 to generate a driving force in the X-direction and Y-direction, thereby offsetting the X-direction and Y-direction forces applied to the workpiece 6 by the uneven airflow.

[0039] Specifically, the air suspension platform 1 is made of non-magnetic materials, including aluminum alloy, carbon fiber composite material and stainless steel, with a thickness ranging from 5 mm to 20 mm. The aperture of the air jet hole 11 ranges from 0.5 mm to 2 mm, and the density of the air jet hole 11 ranges from 4 to 16 holes per square centimeter, depending on the weight of the workpiece and the required stability.

[0040] For lighter or more delicate workpieces, smaller air jet holes 11 of 0.5 to 1 mm in diameter are usually selected, with a density ranging from 10 to 16 holes per square centimeter. For larger or heavier workpieces, larger air jet holes 11 of 1 to 2 mm in diameter are usually selected, with a density ranging from 6 to 10 holes per square centimeter.

[0041] The air jet holes 11 are evenly distributed on the entire surface of the air suspension platform to ensure that the workpiece can obtain uniform support force at any position. This design helps to reduce the tilt or movement of the workpiece caused by uneven airflow during the cutting process.

[0042] The air jets 11 supply high-pressure air through an adjustable airflow pressure system. Users can adjust the airflow output of the air jets based on the weight and shape of the workpiece to achieve the optimal levitation effect. For example, for heavier workpieces, the air pressure can be increased to provide greater buoyancy, while for lighter workpieces, the air pressure can be reduced to prevent excessive airflow and workpiece instability.

[0043] Combine Figure 2The surface of the air suspension platform 1 is rectangular, the air injection holes 11 are arranged in a rectangular array on the air suspension platform 1, and the X-direction thrust coil 21 and the Y-direction thrust coil 22 are respectively arranged on both sides of the air suspension platform 1.

[0044] Combine Figure 3 , multiple suspension positioning units 3 can be connected to each other through a frame 4, the frame 4 is made of non-magnetic material, the materials of the frame 4 include aluminum alloy, carbon fiber composite material and stainless steel, and the shape of the frame 4 can be rectangular, circular or a special shape that conforms to the surface shape of the workpiece.

[0045] A portion of the suspension positioning units 3 is only affected by the X-direction thrust coil 21 , and another portion of the suspension positioning units 3 is only affected by the Y-direction thrust coil 22 . Overall, the frame 4 and the workpiece 6 are simultaneously affected by the X-direction magnetic force and the Y-direction magnetic force.

[0046] This design reduces the flexibility of the suspension positioning unit 3. The user needs to design frames 4 of different shapes according to the shape of the workpiece 6. However, it reduces the scrap rate. The forces in different directions applied by the suspension positioning unit 3 to the workpiece 6 are transferred to the frame 4, reducing the internal stress borne by the workpiece 6.

[0047] Specifically, the X-direction thrust coil 21 and the Y-direction thrust coil 22 are both composed of precision-wound copper coils. The core of the copper coils is provided with a high-magnetic-permeability material, such as silicon steel sheet or soft magnetic ferrite. The X-direction thrust coil 21 and the Y-direction thrust coil 22 are fixed to the bottom or side of the air suspension platform 1 by screws or special clamps. During the installation process, it is necessary to ensure the parallelism and position accuracy of the coils to ensure the effectiveness and uniformity of the magnetic field.

[0048] In addition, by coordinating the control of the X-direction thrust coil 21 and the Y-direction thrust coil 22, complex movements of the workpiece within the plane can be achieved. For example, complex operations such as linear movement, curved movement or rotation in place of the workpiece can be achieved. Combined with the Cartesian coordinate movement of the laser head 5, it can meet various processing requirements.

[0049] The number and initial position of the suspended positioning units 3 can be adjusted according to factors such as the shape and size of the workpiece 6, and the type of the restraint 31 can be selected according to factors such as the thickness, weight, and strength of the workpiece 6. For example, a positioning column, positioning plate, positioning pin, positioning claw, clamp or suction cup can be used as the restraint 31.

[0050] Combine Figure 1 and Figure 3The frame 4 is rectangular, and the restraint 31 adopts a clamp. The restraint 31 is used to restrain the four sides of the workpiece 6. This design is suitable for rectangular workpieces 6. The suspension positioning unit 3 is located outside the cutting range of the workpiece 6. After the laser beam 51 completes the cutting, the remaining material is restrained by the suspension positioning unit 3.

[0051] Specifically, the body of the suspension positioning unit 3 is made of high-strength, lightweight materials to ensure that it can be stably suspended under the action of airflow without causing excessive burden on the workpiece 6. Common material choices include aluminum alloy, carbon fiber composite materials and high-performance plastics.

[0052] The suspension positioning unit 3 adopts a hollow frame design and has a rectangular or polygonal shape, so that the user can easily observe the position and angle of the suspension positioning unit 3.

[0053] The restraint 31 is directly fixed to the body of the suspension positioning unit 3 by bolts, screws or clips. Preferably, the restraint 31 is detachably mounted on the body of the suspension positioning unit 3 through a clip hole. This design allows the user to replace different types of restraints 31 as needed.

[0054] The permanent magnet 32 ​​is embedded in the bottom of the suspension positioning unit 3 and is bonded to the suspension positioning unit 3 with high-strength glue. The embedded design helps to reduce the exposed area of ​​the permanent magnet 32 ​​and reduce damage caused by external magnetic field interference or mechanical collision.

[0055] In addition, in order to realize automatic control of monitoring the status of the workpiece 6 and adjusting the force of the thrust coil in real time: the laser cutting air suspension device also includes optical sensors such as laser displacement sensors, CCD cameras, as well as accelerometers and gyroscopes. Any of the above optical sensors is installed around the air suspension platform 1, and the accelerometer and gyroscope are installed inside the suspension positioning unit 3.

[0056] The laser displacement sensor measures the displacement of the workpiece in the X, Y, and Z directions through the signal reflected from the laser beam. At the same time, it detects the tilt angle and tiny vibration of the workpiece through the change in the incident angle of the laser beam. It has the characteristics of high precision and high response speed, and can monitor the position changes of the workpiece in real time during the cutting process.

[0057] The CCD camera captures the image of the workpiece and detects the tilt angle and vibration of the workpiece through image processing algorithms. Compared with the laser sensor for point measurement, the CCD camera can provide a global image of the workpiece, thereby more comprehensively analyzing the posture of the workpiece.

[0058] The accelerometer directly measures the force and direction of the suspension positioning unit 3 . These data can reflect the force applied to the workpiece 6 during the suspension process, as well as the impact of external interference on the workpiece.

[0059] The gyroscope is installed at the center of the suspension positioning unit 3 to ensure that the angular velocity changes in all directions of the suspension positioning unit 3 can be accurately measured. Since the suspension positioning unit needs to maintain a high degree of balance and stability, the gyroscope should be fixed on a stable bracket, and the bracket design needs to take vibration isolation into account to avoid the influence of external vibration on the measurement accuracy.

[0060] The gyroscope is combined with the accelerometer to form a complete attitude measurement system. The accelerometer is mainly responsible for detecting linear acceleration, while the gyroscope is responsible for measuring angular velocity. The two work together to accurately sense the omnidirectional motion state of the suspension positioning unit.

[0061] The controller integrates the angular velocity data measured by the gyroscope with the data from the accelerometer and optical sensor to form a comprehensive perception of the suspended positioning unit 3. The controller uses this data to calculate the real-time posture of the suspended positioning unit, including its tilt and rotation state in space.

[0062] When any of the above sensors detects that the suspension positioning unit is tilted or rotated, the controller calculates the thrust required to correct the posture based on this information. The controller will adjust the input current of the X-direction thrust coil 21 and the Y-direction thrust coil 22 accordingly, as well as the output airflow of the air jet hole 11 to generate an appropriate magnetic field, apply forces in the X-direction, Y-direction and Z-direction to the suspension positioning unit 3, and restore the workpiece to a balanced state.

[0063] The advantages of this design are:

[0064] First, the thrust coil interacts with the permanent magnet 32 ​​in the suspension positioning unit 3 to generate additional control force, which can effectively counteract the impact of airflow imbalance and ensure the stability of the workpiece 6 in the suspension state.

[0065] Second, the dynamic control capability of the thrust coil enables the workpiece 6 to maintain a precise position during the cutting process, ensuring the accuracy of the cutting path even under air flow fluctuations or other external disturbances.

[0066] 3. By combining gas suspension and magnetic field drive, non-contact support and positioning of the workpiece 6 are achieved, reducing mechanical friction and wear problems, thereby extending the service life of the equipment and reducing maintenance costs.

[0067] (Second embodiment)

[0068] The second embodiment differs from the first embodiment in that:

[0069] Combine Figure 4In the second embodiment, the frame 4 is eliminated, and the restraining member 31 adopts a suction cup. The restraining member 31 is used to adsorb the bottom wall of the workpiece 6. This design is suitable for workpieces 6 with irregular shapes. The suspension positioning unit 3 is located below the workpiece 6, and the suspension positioning unit 3 is set on the inner side of the cutting range of the workpiece 6. After the laser beam 51 completes the cutting, the workpiece 6 is restrained by the suspension positioning unit 3.

[0070] Combine Figure 4 and Figure 5 In the second embodiment, the magnetic field generating unit includes X-direction thrust coils 21 and Y-direction thrust coils 22 arranged along a rectangular array and staggered with each other, and the air injection hole 11 is arranged between adjacent X-direction thrust coils 21 and Y-direction thrust coils 22.

[0071] The advantages of this design are:

[0072] The staggered arrangement of the X-direction thrust coil 21, the Y-direction thrust coil 22 and the air jet hole 11 improves the coverage and uniformity of the magnetic field, thereby reducing the instability of the workpiece during the cutting process. The suspension positioning unit 3 can be set at any position in the air suspension platform 1. The number and position of the suspension positioning unit 3 can be adjusted according to the specific shape and size of the workpiece 6, thereby adapting to the cutting requirements of various complex workpieces 6.

[0073] (Third embodiment)

[0074] Due to the uneven internal structure or material distribution of the special-shaped workpiece 6, there is a weight difference between the weight-concentrated area and the non-concentrated area of ​​the workpiece 6. In order to ensure the overall balance and stability of the workpiece 6 in the suspended state, the density of the air jet holes can be increased in the area where the workpiece weight is concentrated or the support requirement is higher to increase the airflow rate in this area.

[0075] However, changing the density of the air jet holes requires replacing the entire air suspension platform 1 . In order to process special-shaped workpieces of different shapes, various air suspension platforms 1 need to be manufactured specifically, resulting in high processing costs.

[0076] To solve this problem, the third embodiment is improved on the basis of the second embodiment. The difference between the third embodiment and the second embodiment is that:

[0077] Combine Figure 6In the third embodiment, a suspension coil 23 is installed in the air suspension platform 1. The suspension coil 23 is arranged below each X-direction thrust coil 21 and Y-direction thrust coil 22. The suspension coil 23 is composed of multiple layers of precision-wound copper coils. The core of the copper coils is installed with a high-magnetic-permeability material, such as silicon steel sheet or soft ferrite. The magnetic field generated by the suspension coil 23 interacts with the permanent magnet 32 ​​in the suspension positioning unit 3 to generate a magnetic force. This magnetic force can be attractive or repulsive, depending on the direction of the magnetic field and the polarity of the permanent magnet. By precisely controlling the magnitude of the magnetic field of the suspension coil 23, stable suspension and height control of the suspension positioning unit 3 can be achieved.

[0078] The suspension coil 23 applies a repulsive force in the Z direction to the permanent magnet 32 ​​in the suspension positioning unit 3. The Z direction is the vertical direction, so that the suspension positioning unit 3 can suspend itself and generate an upward thrust on the workpiece 6. In the area where the weight of the special-shaped workpiece is concentrated, the upward thrust applied by the suspension positioning unit 3 to the special-shaped workpiece can be changed by increasing the number of suspension positioning units 3 and increasing the input current of the suspension coil 23. The gas buoyancy generated by the airflow output by the air jet hole 11 can provide stronger support, thereby offsetting the weight difference between the weight concentrated area and the non-concentrated area of ​​the workpiece 6.

[0079] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the embodiments of the present invention.

Claims

1. A laser cutting air suspension device, It is characterized in that include: An air suspension platform (1), a magnetic field generating unit, a suspension positioning unit (3), and a feedback and control system; The suspension positioning unit (3) comprises a restraining member (31) and a permanent magnet (32), wherein the restraining member (31) is used to restrict the movement of the workpiece (6), and the permanent magnet (32) is fixedly connected to the suspension positioning unit (3); The air suspension platform (1) is provided with a plurality of air jet holes (11), and the air jet holes (11) are used to spray airflow, so that the suspension positioning unit (3) and the workpiece (6) fixed thereto are suspended above the air suspension platform (1); The magnetic field generating unit is used to generate a control magnetic field on the air suspension platform (1) that interacts with the permanent magnet (32), and the control magnetic field is used to apply a driving force to the permanent magnet (32) to offset the force in the horizontal direction of the airflow acting on the workpiece (6), and at the same time offset the difference between the weight of the workpiece (6) and the buoyancy force applied by the airflow to the workpiece (6); The feedback and control system comprises a sensor for monitoring the posture of the suspension positioning unit (3) and / or the workpiece (6), and a controller for controlling the magnetic field generating unit, wherein the controller adjusts the control magnetic field generated by the magnetic field generating unit in real time according to information fed back by the sensor, so as to ensure the stability of the workpiece (6) in a suspended state.

2. A laser cutting air suspension device according to claim 1, characterized in that: The magnetic field generating unit comprises an X-direction thrust coil (21) and a Y-direction thrust coil (22), wherein the X-direction thrust coil (21) and the Y-direction thrust coil (22) are used to generate a control magnetic field that interacts with the permanent magnet (32) in the X-direction and the Y-direction, wherein the X-direction and the Y-direction are both horizontal directions and perpendicular to each other.

3. A laser cutting air suspension device according to claim 2, characterized in that: The magnetic field generating unit further comprises a suspension coil (23), the suspension coil (23) being used to generate a control magnetic field in a vertical direction, the suspension coil (23) being used to provide an additional suspension force to the workpiece (6) through the restraining member (31), so as to reduce the dependence of the workpiece (6) on the buoyancy of the airflow of the air jet hole (11), thereby achieving highly stable control of the workpiece (6).

4. A laser cutting air suspension device according to claim 3, characterized in that: The sensor comprises an optical sensor, which is installed around the air suspension platform (1). The optical sensor is used to monitor and provide feedback in real time on the horizontal position, tilt angle and vibration of the suspension positioning unit (3) and / or the workpiece (6), so as to provide the information to the controller so as to adjust the input current of the X-direction thrust coil (21), the Y-direction thrust coil (22) and the suspension coil (23).

5. The laser cutting air suspension device according to claim 4, characterized in that: The sensor comprises an accelerometer and a gyroscope, wherein the accelerometer and the gyroscope are installed inside the suspension positioning unit (3) and are used to monitor the force, direction, angular velocity and posture of each suspension positioning unit (3) in real time, so as to provide the information to the controller so as to adjust the input current of the X-direction thrust coil (21), the Y-direction thrust coil (22) and the suspension coil (23).

6. The laser cutting air suspension device according to claim 5, characterized in that: The plurality of air jet holes (11) are evenly distributed on the air suspension platform (1).

7. The laser cutting air suspension device according to claim 6, characterized in that: The X-direction thrust coil (21) and the Y-direction thrust coil (22) are arranged around the jet hole (11).

8. The laser cutting air suspension device according to claim 6, characterized in that: The X-direction thrust coils (21) and the Y-direction thrust coils (22) are arranged along a rectangular array and staggered with each other, the jet holes (11) are arranged between adjacent X-direction thrust coils (21) and Y-direction thrust coils (22), and the suspension coils (23) are arranged beside the X-direction thrust coils (21) and the Y-direction thrust coils (22).

9. The laser cutting air suspension device according to claim 1, characterized in that: The plurality of suspension positioning units (3) are fixedly connected to each other via a frame (4).

10. The laser cutting air suspension device according to claim 1, characterized in that: When the workpiece (6) is positioned, the restraining member (31) abuts against the edge of the workpiece (6) from the outside of the workpiece (6), or the restraining member (31) adsorbs the surface of the workpiece (6) from the inside of the workpiece (6).

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