A constant depth cutting device based on height adjustment

Abstract

This invention belongs to the technical field of cutting machine equipment, and particularly relates to a constant depth cutting device based on height adjustment. This invention provides a constant depth cutting device based on height adjustment, including a main shaft mounted on the cutter holder of the cutting machine, an outer ring sleeved on the main shaft, a dynamic measuring mechanism disposed on the side wall of the outer ring, and a locking brake disposed between the main shaft and the outer ring. The dynamic measuring mechanism can rotate around the main shaft and achieve rapid locking at any angle through the electromagnetic brake. This allows the device to maintain measurement at the side of the cutter under normal conditions, and to actively control and adjust the measuring point to eliminate bias errors caused by the measurement trajectory in special scenarios such as small-radius sharp-angle cutting, opening round holes, and avoiding waste materials, thereby achieving constant depth cutting.

Description

Technical Field

[0001] This invention belongs to the technical field of cutting bed equipment, and particularly relates to a constant depth cutting device based on height adjustment. Background Technology

[0002] Maintaining a constant cutting depth is crucial during the cutting process. The cutting depth must be sufficient to completely sever the fabric without cutting through the underlying backing and causing damage. Therefore, existing cutting machines typically have a measuring device installed near the cutting tool to monitor changes in the fabric's surface height in real time. This monitoring signal is transmitted to the machine's CNC system, which adjusts the cutting depth based on the detected height information, thus achieving a constant-depth cut.

[0003] For example, Chinese invention patent CN106948157B discloses an automatic adjustment device and method for adjusting the cutting depth of a cutting blade. The device includes a controller, a height gauge, and a human-machine interface. The height gauge is used to detect the height between the fabric reference surface and the height gauge before cutting as an initial value H, and during cutting, it detects the height between each current cutting point on the fabric and the height gauge in real time as an actual value H1. The human-machine interface is used to input the thickness value D and the error range value S of the fabric to be cut. The controller analyzes and calculates the initial value H, the actual value H1, the thickness value D, and the error range value S, and outputs the actual cutting depth value to control the cutting blade to cut according to the actual cutting depth value.

[0004] The automatic cutting depth adjustment device in this invention patent has the following basic structural principle: it can automatically adjust the cutting depth of the cutting blade according to the actual situation.

[0005] However, the existing technology still has the following shortcomings in actual use, which are the technical problems that this invention aims to solve: 1. Using a measuring device installed in a fixed position, such as offset on the side of the tool for detection, cannot address the problem of height measurement deviation in special cutting scenarios; 2. Conventional approaches often use algorithm compensation to adapt to various special scenarios, but there are still large errors in small radius sharp turning cutting areas, making it impossible to achieve true constant depth cutting.

[0006] In conclusion, it is necessary to develop a new type of constant-depth cutting device to solve this problem. Summary of the Invention

[0007] This invention provides a constant depth cutting device based on height adjustment, including a main shaft mounted on a cutting bed, an outer ring sleeved on the main shaft, a dynamic measuring mechanism disposed on the side wall of the outer ring, and a locking brake disposed between the main shaft and the outer ring. The dynamic measuring mechanism can rotate around the main shaft and achieve rapid locking at any angle through the electromagnetic brake, so that: this application can not only keep the measurement on the side of the tool under normal conditions, but also actively control and adjust the measuring point to eliminate the bias error caused by the measuring trajectory when encountering special scenarios such as small radius sharp angle cutting, opening round holes, and avoiding waste materials, thus further achieving constant depth cutting.

[0008] This invention overcomes the shortcomings of existing technologies and provides a constant depth cutting device based on height adjustment, installed on the cutter holder of a cutting bed, comprising: a main shaft, on which a cutting blade is mounted and driven to rotate and rise by a CNC system of the cutting bed; an outer ring, sleeved on the outside of the main shaft via bearings; a dynamic measuring mechanism, including a gear ring disposed on the outer circumferential surface of the outer ring, a gear disposed on the side of the outer ring and meshing with the gear ring, a motor for driving the gear to rotate, a cantilever disposed on the outer circumferential surface of the outer ring, located below the gear ring and extending outward in parallel, a measuring roller disposed at the lower end of the cantilever, the measuring roller moving around the main shaft under the drive of the motor; and a locking brake, including a component fixedly disposed on the main shaft. The device comprises a fixed ring platform on the end housing, a stator friction disk fixedly disposed below the fixed ring platform, a moving ring platform disposed on the upper end face of the outer ring, an armature friction disk disposed above the moving ring platform, two friction plates disposed on the opposite end faces of the stator friction disk and the armature friction disk, a guide pin axially fixedly disposed on the upper end face of the moving ring platform for axial sliding of the armature friction disk, a compression spring sleeved on the guide pin and located between the moving ring platform and the armature friction disk, a push rod type electromagnet fixedly disposed at the lower end of the fixed ring platform, and an annular groove disposed on the stator friction disk and the friction plates for accommodating the push rod type electromagnet. The two friction plates are pressed / separated against each other under the action of the push rod type electromagnet.

[0009] A further preferred technical solution is that the push rod electromagnet includes a stationary iron core with an axial through hole in the center, a coil winding wound around the outer periphery of the stationary iron core, a moving iron core axially slidably disposed in the axial through hole of the stationary iron core, a push rod disposed at the lower end of the moving iron core, and a return spring disposed in the inner cavity of the stationary iron core and acting on the upper end of the moving iron core.

[0010] A further preferred technical solution is that the measuring roller component includes a guide post disposed at the lower end of the cantilever, a slider slidably disposed on the guide post, a measuring wheel disposed at the lower end of the slider and mounted by a bracket, and a floating spring disposed between the slider and the cantilever.

[0011] A further preferred technical solution is that the bearing is a crossed roller bearing.

[0012] A further preferred technical solution is that: a roller is provided at the lower end of the push rod, and an annular track is provided on the upper surface of the armature friction disk for the roller to roll into contact with the armature friction disk.

[0013] A further preferred technical solution is that the measuring roller component also includes a damping vibration isolator disposed on the slider.

[0014] A further preferred technical solution is that the gear is a planetary reducer.

[0015] A further preferred technical solution is that a first position sensor for detecting the rotation angle of the outer ring relative to the main shaft is provided between the main shaft and the outer ring, and a second position sensor for detecting the height of the measuring wheel is provided at the upper end of the cantilever.

[0016] A further preferred technical solution includes a controller, which is electrically connected to the motor, the push rod electromagnet, the first position sensor, the second position sensor, and the cutting bed CNC system.

[0017] The beneficial effects of this invention are at least as follows: 1. The coaxial nested structure of the main shaft and the outer ring allows the measuring roller to rotate 360 ​​degrees around the cutter, actively adjusting the relative position between the measuring point and the cutting path, effectively solving the offset error caused when the cutting bed cuts small-diameter circular holes or small-radius acute angles; 2. The geometric relationship between the measuring roller and the cutter is determined at any angle, fundamentally ensuring the consistency of the measuring trajectory and the cutting trajectory after repositioning; 3. The push rod electromagnet is only briefly energized and released when rotation is required, and even if the cutting bed is suddenly de-energized, the outer ring remains locked, greatly improving the safety of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a front view of the present invention; Figure 5This is a front sectional view of the present invention; Figure 6 For the present invention Figure 5 A magnified view of a portion of point A in the middle.

[0020] The meanings of the various reference numerals in the figure are as follows: cutter a; 1. Main spindle; 2. Outer ring; 3. Bearing; 4. Dynamic measuring mechanism; 5. Locking brake; 41. Gear ring; 42. Motor; 43. Cantilever; 44. Measuring roller; 45. Fixed ring platform; 51. Stator friction disc; 52. Moving ring platform; 53. Armature friction disc; 54. Friction plate; 55. Guide pin; 56. Compression spring; 57. Push rod electromagnet; 58. Ring groove; 59. Ring track; 510. Guide post 451, slider 452, measuring wheel 453, floating spring 454, damping vibration isolator 455, stationary iron core 581, coil winding 582, moving iron core 583, push rod 584, return spring 585, roller 586. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0022] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc., mentioned or possibly mentioned in this specification are defined relative to the structure shown in the accompanying drawings. The terms "inner" and "outer" refer to the direction toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0023] As attached Figures 1-6As shown, a constant depth cutting device based on height adjustment is installed on the cutter holder of a cutting bed, comprising: a main shaft 1, on which a cutting blade a is mounted at the bottom and driven to rotate and rise by the CNC system of the cutting bed; an outer ring 2, which is sleeved on the outside of the main shaft 1 via a bearing 3; and a dynamic measuring mechanism 4, including a gear ring 41 disposed on the outer circumferential surface of the outer ring 2, a gear 42 disposed on the side of the outer ring 2 and meshing with the gear ring 41, and a motor 43 for driving the gear 42 to rotate, disposed on the outer circumferential surface of the outer ring 2 and located on the outer circumferential surface of the outer ring 2. A cantilever 44 extends outward parallel to the gear ring 41 below it, and a measuring roller 45 is disposed at the lower end of the cantilever 44. The measuring roller 45 moves around the main shaft 1 under the drive of the motor 43. The locking brake 5 includes a fixed ring platform 51 fixedly disposed on the upper housing of the main shaft 1, a stator friction disk 52 fixedly disposed below the fixed ring platform 51, a moving ring platform 53 disposed on the upper end face of the outer ring 2, and an armature friction disk 54 disposed above the moving ring platform 53. The locking brake 5 is respectively disposed on the stator friction disk 52. Two friction plates 55 on the opposite end faces of the friction plate 52 and the armature friction plate 54; a guide pin 56 axially fixed on the upper end face of the moving ring platform 53 for axial sliding of the armature friction plate 54; a compression spring 57 sleeved on the guide pin 56 and located between the moving ring platform 53 and the armature friction plate 54; a push rod type electromagnet 58 fixedly installed at the lower end of the fixed ring platform 51; and an annular groove 59 installed on the stator friction plate 52 and the friction plates 55 for accommodating the push rod type electromagnet 58. The two friction plates 55 are pressed / separated against each other under the action of the push rod type electromagnet 58. A first position sensor for detecting the rotation angle of the outer ring 2 relative to the main shaft 1 is provided between the main shaft 1 and the outer ring 2. A second position sensor for detecting the height of the measuring wheel 453 is provided at the upper end of the cantilever. The system also includes a controller, which is electrically connected to the motor 43, the push rod type electromagnet 58, the first position sensor, the second position sensor, and the cutting bed CNC system.

[0024] To achieve constant depth cutting, this application mounts a measuring roller on a cantilever that can rotate around a spindle. The measuring roller, in close contact with the fabric surface, rolls across the fabric as the cutter head moves, enabling real-time detection of changes in fabric surface height. This detection signal is transmitted to the CNC system of the cutting machine, which then adjusts the cutting depth of the cutter based on the height information. Normally, the measuring roller remains beside the cutter, operating as in traditional methods. However, in cutting scenarios involving small radii of curvature turns or sharp turns greater than 60 degrees, the cutter needs to make large-angle turns within a short distance. In these situations, the measuring roller, under the action of a locking brake, adjusts the position of the measuring point and continuously adjusts its measurement direction according to the cutting path during its forward movement. This ensures that the measured height matches the actual cutting position height, preventing errors in the signal received by the CNC system from causing deviations in the cutting depth.

[0025] The specific design is as follows: This device includes a main shaft, an outer ring, a dynamic measuring mechanism, and a locking brake. The main shaft is the core supporting component of this device, with a cutting blade mounted at its bottom. The cutting blade can be a vibrating blade, a circular blade, or a straight blade. The main shaft is driven by the CNC system of the cutting machine, enabling it to rotate around its own axis or move vertically. The rotational motion is used to adjust the cutting direction of the cutting blade, and the vertical motion is used to adjust the cutting depth of the cutting blade. These driving mechanisms are all part of the original structure of the cutting machine. The outer ring is a hollow annular shell, which is fitted onto the outside of the main shaft through bearings, allowing the outer ring to rotate freely relative to the main shaft around the same axis. Rubber bellows seals are also provided at both ends of the bearing to prevent cutting debris and dust from entering the bearing.

[0026] The dynamic measuring mechanism is the core functional component for realizing the rotation of the measuring roller and the detection of fabric height. It includes a gear ring, gears, a motor, a cantilever, and measuring rollers. The gear ring is set on the outer circumference of the outer ring, and the gear is set on the side of the outer ring and meshes with the gear ring. The motor drives the gear to rotate. When the motor rotates, the gear drives the gear ring to rotate, the gear ring drives the outer ring to rotate, and the outer ring drives the cantilever and measuring rollers to rotate together around the main shaft.

[0027] The locking brake is crucial for locking and releasing the relative position of the outer ring and the main shaft. It comprises a fixed ring platform, a stator friction disc, a moving ring platform, an armature friction disc, friction plates, a guide pin, a compression spring, and a push-rod electromagnet. The fixed ring platform is fixed to the housing at the upper end of the main shaft, the stator friction disc is fixed below the fixed ring platform, the moving ring platform is located on the upper surface of the outer ring and rotates integrally with it, and the armature friction disc is located above the moving ring platform and can slide up and down along the guide pin. Under normal conditions, the push-rod electromagnet is not energized. The compression spring pushes the armature friction disc upwards, causing the friction plates on the armature friction disc to fit tightly against the friction plates on the stator friction disc, locking the outer ring. When rotation is required, the push-rod electromagnet is energized, the push rod extends and presses down on the armature friction disc. The push rod's force is greater than the compression spring's force, causing the two friction plates to separate, allowing the outer ring to rotate freely. The friction plates are made of copper-based powder metallurgy, with a friction coefficient between 0.3 and 0.45, exhibiting good wear resistance and thermal stability in a dry state. This electromagnetic braking method based on end-face friction has two significant advantages: 1. The contact area of ​​end-face friction can be made very large, and only a small axial displacement is needed to achieve the switching from fully pressed to fully separated state. Combined with the rapid response of the push rod electromagnet, the entire action can be completed quickly in a short time; 2. It remains locked under normal conditions and is only briefly energized to release when rotation is required, ensuring the daily stability of the measuring roller and greatly improving the safety of equipment use.

[0028] A first position sensor, employing an absolute rotary encoder, is installed between the main shaft and the outer ring to detect the rotation angle of the outer ring relative to the main shaft. A second position sensor, using a miniature optical encoder, is installed at the upper end of the cantilever to detect the height position of the measuring wheel. Data from both sensors is transmitted to the controller, which is electrically connected to the motor, push-rod electromagnet, the two position sensors, and the cutting bed CNC system. During operation, the controller reads the cutting path data from the cutting bed CNC system, predicts the upcoming area, and initiates the switching program at the appropriate time. For example, it analyzes the radius of curvature and angle of the cutting path in real time. When the radius of curvature is less than a set value or the angle is greater than a threshold, it calculates the current cutting speed of the cutting head, adjusts the switching advance time according to the formula, and sends a switching signal t milliseconds before reaching the trajectory segment. The controller may also include a signal processing module to filter the height signal detected by the second position sensor, precisely filtering out high-frequency vibration interference from the vibrating knife and retaining only the low-frequency height signal generated by the macroscopic undulations of the fabric surface.

[0029] The specific working process of this embodiment is as follows: Under normal conditions, the outer ring is locked by the locking brake, and the measuring roller stays on the side of the cutter, working like a traditional fixed installation method, detecting the height of the fabric surface in real time and feeding it back to the CNC system; when the controller predicts the area where the measuring position needs to be adjusted by reading the cutting path, it starts the repositioning program in advance before reaching the area: the electromagnet is energized to release the outer ring, and the motor drives the measuring roller to rotate to the target position, such as directly in front of or behind the cutter. The electromagnet is de-energized and relocks the outer ring. During the cutting process, the detection trajectory and the cutting trajectory are always completely overlapped to eliminate the offset error. After the cutting is completed, the controller starts the repositioning program again to rotate the measuring roller back to the side position and restore the normal working mode.

[0030] A constant depth cutting method based on height adjustment, using the aforementioned constant depth cutting device, includes the following steps: Normal cutting step: The spindle drives the blade to perform straight or large-circle cutting, the locking brake is in a power-off locked state, and the measuring roller is located to the side of the blade and remains stationary, real-time detection of the fabric surface height to adjust the cutting depth; Prediction step: The controller analyzes the cutting path, and when it detects a trajectory segment with a radius of curvature less than a preset threshold or a turning angle greater than a preset threshold, it calculates the shift advance time and issues a shift signal; Shifting step: The locking brake is energized and released, and the motor drives the measuring roller to rotate around the spindle to the target position; Locking step: The locking brake is de-energized and locked, fixing the measuring roller at the target position; Acute angle cutting step: The blade performs small-radius acute angle cutting, and the measuring roller real-time detection of the fabric surface height at the target position to adjust the cutting depth.

[0031] According to the constant depth cutting method described above, in the prediction step, the controller reads the angular velocity of the spindle servo motor encoder, compares the encoder value, and triggers a position change if the value exceeds the threshold.

[0032] As a preferred embodiment, the push rod electromagnet 58 includes a stationary iron core 581 with an axial through hole in the center, a coil winding 582 wound around the outer periphery of the stationary iron core 581, a moving iron core 583 axially slidably disposed in the axial through hole of the stationary iron core 581, a push rod 584 disposed at the lower end of the moving iron core 583, and a return spring 585 disposed in the inner cavity of the stationary iron core 581 and acting on the upper end of the moving iron core 583.

[0033] In this embodiment, multiple push-rod electromagnets are arranged evenly along the circumference. The stationary iron core 581 is made of electrical pure iron, and the coil winding is made of enameled wire wound around the outer circumference of the stationary iron core and located at the top. The moving iron core is a cylindrical armature that is axially slidably disposed in the axial through hole of the stationary iron core. The push rod is located at the lower end of the moving iron core and extends from the lower end of the stationary iron core. The upper end of the return spring abuts against the top of the inner cavity of the stationary iron core, and the lower end abuts against the upper end of the moving iron core. When the coil winding is energized, the electromagnet generates a magnetic field, the moving iron core moves downward, and the push rod extends. The lower end of the push rod is equipped with a roller through a miniature bearing. When the push rod extends, the roller contacts the upper end surface of the armature friction disc. When the power is off, the return spring pushes the moving iron core back to its initial position.

[0034] As a preferred embodiment, the measuring roller component 45 includes a guide post 451 disposed at the lower end of the cantilever 44, a slider 452 slidably disposed on the guide post 451, a measuring wheel 453 disposed at the lower end of the slider 452 and mounted by a bracket, and a floating spring 454 disposed between the slider 452 and the cantilever 44.

[0035] In this embodiment, the guide post is vertically fixed to the lower end of the cantilever. The slider, mounted on the guide post via a linear bearing, can slide vertically up and down. The measuring wheel is mounted on the lower end of the slider, and a floating spring is positioned between the slider and the cantilever, consistently providing a downward thrust to the slider. Under the action of the floating spring, the measuring wheel automatically adheres to the fabric surface, floating up and down with the undulations of the fabric surface. The purpose of this floating design is to ensure that the measuring wheel maintains a relatively constant contact force with the fabric, ensuring reliable contact regardless of whether the fabric surface is flat or undulating. The central shaft of the measuring wheel is mounted on a U-shaped bracket via two miniature bearings. One end of the central shaft is connected to an incremental rotary encoder to detect the rotation of the measuring wheel.

[0036] As a preferred embodiment, the bearing 3 is a crossed roller bearing.

[0037] In this embodiment, a measuring roller and a cantilever are suspended on one side of the outer ring, which will bring a unilateral overturning moment to the outer ring. Ordinary bearings, such as deep groove ball bearings or tapered roller bearings, require multiple bearings to withstand this overturning moment, resulting in a complex structure and increased size. However, the rollers of the crossed roller bearing are arranged at 90 degrees, and a single bearing can simultaneously withstand radial load, axial load and overturning moment, resulting in a compact structure and high reliability.

[0038] As a preferred embodiment, the lower end of the push rod 584 is provided with a roller 586, and the upper surface of the armature friction disk 54 is provided with an annular track 510 for the roller 586 to roll in contact with the armature friction disk 54.

[0039] In this embodiment, when the push rod extends, the roller makes rolling contact with the ring track. Therefore, even if the armature friction disc has a slight angular deviation in the locked state, such as due to errors caused by machining and assembly, the roller can still roll smoothly on the ring track without getting stuck due to friction, which greatly reduces the wear of parts and extends the service life of the brake.

[0040] As a preferred embodiment, the measuring roller 45 further includes a damping vibration isolator 455 disposed on the slider 452.

[0041] In this embodiment, the damping vibration isolator is installed on the connection path between the slider and the measuring wheel, including a hydraulic damper and a spring element. When the cutting head is working, it will generate high-frequency vibration, which will be transmitted to the measuring wheel through the fabric. Without vibration isolation measures, the high-frequency vibration will interfere with the height measurement. The function of the damping vibration isolator is to allow the low-frequency fabric undulation signal to pass smoothly, while significantly attenuating the high-frequency vibration signal. When used in conjunction with a digital filter, a better signal-to-noise ratio can be achieved.

[0042] As a preferred embodiment, the gear 42 is a planetary reducer.

[0043] In this embodiment, the planetary reducer includes a sun gear, multiple planet gears, an internal gear ring, and a planet carrier. The output shaft of the motor is connected to the sun gear of the planetary reducer. The internal gear ring of the planetary reducer is fixed on the tool holder support. The output of the planet carrier is connected to a pinion gear, which then meshes with the gear ring. The planetary reducer uses a single-stage reduction, which amplifies the torque of the driving outer ring, allowing for smooth rotation even with thicker fabric and greater resistance, and improving angular accuracy.

[0044] The aforementioned controllers, sensors, damping vibration isolators, planetary reducers, bearings, encoders, and cutting bed CNC systems are common knowledge known to those skilled in the art, and therefore will not be described in detail here.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A constant depth cutting device based on height adjustment, installed on a knife holder of a cutting bed, characterized in that, include: The main spindle has a cutting blade mounted at its bottom and is driven to rotate and lift by the CNC system of the cutting bed; The outer ring is sleeved on the outside of the main shaft via a bearing; The dynamic measuring mechanism includes a gear ring disposed on the outer circumferential surface of the outer ring, a gear disposed on the side of the outer ring and meshing with the gear ring, a motor for driving the gear to rotate, a cantilever disposed on the outer circumferential surface of the outer ring, located below the gear ring and extending outward in parallel, and a measuring roller disposed at the lower end of the cantilever. The measuring roller moves around the main shaft under the drive of the motor. The locking brake includes a fixed ring platform fixedly mounted on the upper end housing of the main shaft, a stator friction disc fixedly mounted below the fixed ring platform, a moving ring platform mounted on the upper end face of the outer ring, an armature friction disc mounted above the moving ring platform, two friction plates respectively mounted on the opposite end faces of the stator friction disc and the armature friction disc, a guide pin axially fixedly mounted on the upper end face of the moving ring platform for axial sliding of the armature friction disc, a compression spring sleeved on the guide pin and located between the moving ring platform and the armature friction disc, a push rod type electromagnet fixedly mounted at the lower end of the fixed ring platform, and annular grooves mounted on the stator friction disc and the friction plates for accommodating the push rod type electromagnet. The two friction plates are pressed / separated against each other under the action of the push rod type electromagnet.

2. A constant-depth cutting device based on height adjustment according to claim 1, characterized in that, The push rod type electromagnet includes a stationary iron core with an axial through hole in the center, a coil winding wound around the outer periphery of the stationary iron core, a moving iron core axially slidably disposed in the axial through hole of the stationary iron core, a push rod disposed at the lower end of the moving iron core, and a return spring disposed in the inner cavity of the stationary iron core and acting on the upper end of the moving iron core.

3. The constant depth cutting device based on height adjustment according to claim 1, characterized in that, The measuring roller assembly includes a guide post disposed at the lower end of the cantilever, a slider slidably disposed on the guide post, a measuring wheel disposed at the lower end of the slider and mounted via a bracket, and a floating spring disposed between the slider and the cantilever.

4. The constant-depth cutting device based on height adjustment according to claim 1, characterized in that, The bearing is a crossed roller bearing.

5. A constant depth cutting device based on height adjustment according to claim 2, characterized in that, The lower end of the push rod is provided with a roller, and the upper surface of the armature friction disk is provided with an annular track for the roller to roll in contact with the armature friction disk.

6. The constant depth cutting device based on height adjustment according to claim 3, characterized in that, The measuring roller also includes a damping vibration isolator disposed on the slider.

7. The depth invariant cutting device of claim 1, wherein, The gear is a planetary reducer.

8. A constant-depth cutting device based on height adjustment according to claim 3, characterized in that, A first position sensor for detecting the rotation angle of the outer ring relative to the main shaft is provided between the main shaft and the outer ring, and a second position sensor for detecting the height of the measuring wheel is provided at the upper end of the cantilever.

9. A constant-depth cutting device based on height adjustment according to claim 8, characterized in that, It also includes a controller, which is electrically connected to the motor, the push rod electromagnet, the first position sensor, the second position sensor and the cutting bed CNC system.

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