Cutting blade for an automated wood cutting apparatus

Abstract

The utility model provides a kind of cutting blade of automated wood cutting equipment belongs to cutting blade technical field, this cutting blade of automated wood cutting equipment includes: the cutter head being set around rotation axis;Fixed in the outer periphery of the cutter head and along radial extension blade;Annular negative pressure cavity being opened in the inside of the cutter head and around the rotation axis;Micro -hole being densely populated in the back of the blade;Rotary joint being clamped between the cutter head and external negative pressure source;And the sealing ring being set on the interfacing surface of the cutter head and the rotary joint;Wherein, the micro -hole is from the blade back surface and penetrates to the annular negative pressure cavity, so that the annular negative pressure cavity and the blade back surface space fluid communication, the rotary joint is continuously introduced into the annular negative pressure cavity when cutter head rotates negative pressure, solve the technical problem that traditional wood cutting blade is easy to break, burr and heat accumulation when high speed cutting due to wood fiber unconstrained, resulting in poor quality of cut, frequent tool change.

Description

Technical Field

[0001] This utility model belongs to the field of cutting blade technology, and more specifically, relates to a cutting blade for an automated wood cutting device. Background Technology

[0002] In the field of deep wood processing, automated wood cutting equipment rapidly divides logs or boards into required specifications through continuous actions such as conveying, positioning, clamping, feeding, cutting, and discharging. It has become fundamental equipment in industries such as furniture, flooring, doors and windows, and timber-framed buildings. Typical automated cutting equipment includes: a frame, a spindle system, a tool magazine or cutter head, a conveyor belt, a pressing device, a dust collection system, and a power transmission unit. The spindle rotates at high speed driven by a motor, and several blades are circumferentially mounted on the cutter head. The wood is conveyed to the area below the cutter head, where it is cut under the high-speed impact and shearing action of the blades. To meet the demands of high-volume, high-cycle production, this type of equipment is often equipped with automatic tool changing, online measurement, and automatic deviation correction functions, aiming to maintain stable operation for extended periods under unattended or minimally staffed conditions.

[0003] However, the cutting blades used in existing automated wood cutting equipment are still mainly traditional solid carbide or high-speed steel blades, whose structure has remained largely unchanged for decades: the blade is directly locked to the outer edge of the cutter head with screws, the cutting edge is exposed in the processing area, and only a very small chip removal gap is left between the blade back and the cutter head. In actual use, this traditional structure has revealed obvious drawbacks. First, wood is an anisotropic material, with a large difference in cutting resistance with and against the grain. The blade edge is prone to instantaneous impact at the reverse grain or knots, causing the wood fibers to be torn rather than cut, resulting in chipping and burrs, which seriously affects the quality of the cut. Second, during high-speed cutting, the blade and wood rub violently together, and heat accumulates rapidly. The resin softens and adheres to the cutting edge, further increasing the cutting resistance and temperature rise, resulting in "blade clogging," forcing the equipment to stop for cleaning and reducing continuous operation capacity. Third, after the blade is chipped or worn, it can only be replaced as a whole, resulting in high material costs and long blade replacement time. If dulled blades are continued to be used, the surface roughness of the cut will deteriorate, and the subsequent sanding process must be increased, which wastes energy and reduces production efficiency. In addition, the chip removal direction of traditional blades is uncontrolled, causing wood chips to fly and accumulate between the cutter head and the workpiece, interfering with cutting stability and posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention provides a cutting blade for an automated wood cutting device, which solves the technical problems of traditional wood cutting blades being prone to breakage due to unrestrained wood fibers, numerous burrs, and heat accumulation during high-speed cutting, resulting in poor cut quality and frequent blade replacement.

[0005] This utility model is implemented as follows: This utility model provides a cutting blade for an automated wood cutting device, comprising: A cutter head positioned around a rotation axis; A blade fixed to the outer periphery of the cutter head and extending radially; An annular negative pressure cavity is formed inside the cutter head and surrounds the axis of rotation; Micropores densely distributed on the back of the blade; A rotary joint clamped between the cutter head and an external negative pressure source; And a sealing ring disposed on the mating surface of the cutter head and the rotary joint; The micropores extend from the back of the blade to the annular negative pressure chamber, allowing the annular negative pressure chamber to be in fluid communication with the space on the back of the blade. The rotary joint continuously introduces negative pressure into the annular negative pressure chamber when the blade disc rotates.

[0006] The micropores are circular through holes, with a preferred pore diameter between 0.3 mm and 1.0 mm, and the spacing between the holes is 3 to 6 times the pore diameter. In the gradient arrangement from the root of the blade towards the cutting edge, the pore diameter gradually decreases from 1.0 mm to 0.3 mm to form a gradually shrinking negative pressure distribution, which not only prevents sawdust from clogging but also ensures uniform adsorption.

[0007] Through a purely mechanical closed loop consisting of a cutter head, blade, annular negative pressure chamber, micropores, rotary joint, and sealing ring, a uniform negative pressure field is formed on the back of the blade when the external negative pressure source continuously draws air. The wood fibers are adsorbed and adhered to the back of the blade in real time, which not only inhibits cracking and burrs but also removes cutting heat, thus improving the surface finish of the blade and eliminating the need for a subsequent sanding process. At the same time, the rotary joint ensures that the negative pressure is uninterrupted when the cutter head rotates at high speed. The structure is compact, requires no electronic components, and is easy to maintain.

[0008] Based on the above technical solution, the cutting blade of the automated wood cutting device of this utility model can be further improved as follows: The outer peripheral wall of the cutter disc is provided with a matching groove that complements the root of the blade. The root of the blade is embedded in the matching groove and mechanically fastened to form a detachable fixation, while maintaining the communication between the micropore and the annular negative pressure chamber.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the detachable fixing of the blade root and the blade disc groove ensures that the negative pressure channel is not damaged, and allows for quick replacement when the blade is worn or chipped, thus shortening downtime; the complementary shape of the groove and the blade root maximizes the negative pressure transmission area, and the adsorption effect is not reduced due to disassembly and assembly.

[0010] Furthermore, the fitting grooves are equidistantly distributed along the circumference of the cutter head, and the bottom of the grooves is connected to the annular negative pressure cavity by a thin wall. Through holes are formed on the thin wall to form the extension of the micropore.

[0011] Thin-wall transition refers to a continuous annular wall plate with a thickness of 0.8mm to 1.5mm that is retained between the bottom of the fitting groove and the outer peripheral wall of the annular negative pressure cavity. This wall plate is integrally formed with the cutter head. Coaxial through holes are opened on the wall plate corresponding to each microhole position, so that the microholes directly connect to the annular negative pressure cavity, thereby achieving airflow communication between the blade and the cavity while maintaining the integrity of the negative pressure cavity.

[0012] Furthermore, the micropores extend obliquely from the back of the blade toward the cutting edge, with the oblique direction opposite to the blade rotation direction, so as to generate an adsorption airflow toward the cutting edge under negative pressure.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the micropores are tilted in the opposite direction to the cutting edge, so that the direction of the adsorption airflow is opposite to the cutting direction, forming a "pull-back" effect, which further presses the wood fibers to the back of the blade, significantly reducing the lifting and tearing of the cutting edge and improving the straightness of the cutting; the tilted design also facilitates the discharge of wood chips and prevents the micropores from clogging.

[0014] Furthermore, the rotary joint includes a stationary end and a rotating end. The stationary end is connected to an external negative pressure source, and the rotating end is coaxially fixed to the cutter head. The two are sealed axially at the end face through an annular sealing ring, so that the negative pressure is transmitted only inside the cutter head without external leakage.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the stationary end of the rotary joint is fixed, and the rotating end rotates with the cutter head. The high-speed radial and axial loads are borne by the double-row angular contact bearings, and the two end face sealing rings realize zero-leakage negative pressure transmission. This not only ensures the stability of the suction force when the cutter head rotates continuously, but also keeps the external pipeline stationary, avoiding hose entanglement or wear.

[0016] Furthermore, the cross-section of the annular negative pressure cavity is rectangular, the outer peripheral wall of the annular negative pressure cavity is fitted with the root of the blade, and the inner peripheral wall of the annular negative pressure cavity is fitted with the mating surface of the rotating end of the rotary joint, forming a continuous negative pressure channel.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the rectangular annular negative pressure cavity is directly attached to the root of the blade, the cavity volume is small and the response is fast; the inner peripheral wall is tightly attached to the rotating end of the rotary joint, forming the shortest negative pressure path and reducing pressure loss; the overall annular structure makes the negative pressure uniformly surround the blade, the circumferential adsorption force is consistent, and the cutting surface quality is uniform.

[0018] Furthermore, the micropores on the back of the blade are arranged in an array, and the array area covers the main cutting force area on the back of the blade. The diameter of each micropore gradually decreases from the root of the blade towards the cutting edge to balance the negative pressure distribution.

[0019] The main cutting force zone refers to the 3mm to 8mm strip-shaped area behind the cutting edge in the direction of rotation of the blade. This area is in continuous contact with the wood surface during the cutting process and bears the maximum cutting reaction force. The micropore array covers at least 70% of this strip-shaped area to ensure that the negative pressure adsorption effectively constrains the wood fibers and removes heat in a timely manner.

[0020] Furthermore, the cutter head has annular grooves on both axial end faces, and the sealing ring is embedded in the annular grooves to form a bidirectional seal with the end face of the rotary joint to prevent negative pressure leakage.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the annular grooves on both sides of the cutter head and the sealing ring form a bidirectional end-face seal, so that even if the cutter head has slight axial movement at high speed, the negative pressure chamber can be kept sealed to prevent the suction force from decreasing due to side leakage; the standardized design of the grooves and sealing rings facilitates quick replacement of the seals and improves the availability of the equipment.

[0022] Furthermore, the micro-hole outlet edge on the back of the blade is rounded to prevent wood fibers from accumulating and clogging the opening.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the rounding of the micro-hole outlet edge eliminates the risk of sharp-angle snagging, and wood chips will not accumulate at the hole opening. After long-term operation, the micro-hole unobstructed rate still remains above 90%. The rounding process is simple and low-cost, but it significantly extends the online working time of the blade and reduces the frequency of manual cleaning.

[0024] Furthermore, the stationary end of the rotary joint is a fixed sleeve, which is connected to a negative pressure pipe through a flange and remains stationary; the rotating end is a rotating sleeve that is coaxially fixed to the cutter head, and its inner hole is connected to the annular negative pressure chamber; the stationary end and the rotating end are supported by a double-row angular contact bearing, and the end face is sealed by two parallel annular sealing rings, so that the negative pressure is only transmitted inside the rotating sleeve and the cutter head, and the stationary end does not rotate with the cutter head.

[0025] Compared with existing technologies, the beneficial effects of the cutting blade of the automated wood cutting equipment provided by this utility model are as follows: Under the action of continuous negative pressure, this utility model transforms the traditional "passive chip removal" into "active adsorption," ensuring that the wood fibers remain tightly attached to the back of the blade at the moment of cutting. The cut edge is no longer torn by reverse grain or knots, resulting in improved surface smoothness. The negative pressure airflow simultaneously removes cutting heat, making it difficult for resin to soften and adhere, significantly extending the blade's sharpness time and increasing the continuous operation cycle. The blade and cutter head are detachably fitted, allowing for the restoration of the entire head's performance with a single replacement, reducing downtime. The rotary joint keeps the negative pressure pipeline stationary during the high-speed rotation of the cutter head, eliminating the risk of hose tangling and greatly improving system reliability. Due to the improved cut quality, the subsequent sanding process is passively reduced, simultaneously decreasing the overall energy consumption and maintenance costs of the equipment. The entire device requires no electronic components; its purely mechanical structure achieves the comprehensive benefits of "adsorption—cooling—crack suppression—process reduction." It has extremely high compatibility with existing automated wood cutting equipment and can be directly put into mass production after installation, resulting in immediate economic benefits. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 An example diagram of a cutting blade for an automated wood cutting device; Figure 2 A side view of the cutting blade of an automated wood cutting device; Figure 3 A top view of the cutting blade of an automated wood cutting device; The attached diagram lists the components represented by each number as follows: 10. Cutter head; 11. Blade; 20. Annular negative pressure chamber; 30. Rotary joint; 31. Stationary end; 32. Rotating end. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0029] like Figures 1-3 The image shown is an example diagram of a cutting blade for an automated wood cutting device provided by this utility model, comprising: A cutter head 10 is arranged around a rotation axis; The blade 11 is fixed to the outer periphery of the cutter head 10 and extends radially; An annular negative pressure cavity 20 is formed inside the cutter head 10 and surrounds the axis of rotation; Micropores are densely distributed on the back of the blade 11; A rotary joint 30 is clamped between the cutter head 10 and the external negative pressure source; And a sealing ring provided on the mating surface between the cutter head 10 and the rotary joint 30; The micropores extend from the back of the blade 11 to the annular negative pressure chamber 20, allowing the annular negative pressure chamber 20 to be in fluid communication with the space on the back of the blade 11. The rotary joint 30 continuously introduces negative pressure into the annular negative pressure chamber 20 when the blade disc 10 rotates.

[0030] In the above technical solution, the outer peripheral wall of the cutter head 10 is provided with a fitting groove that complements the root of the blade 11. The root of the blade 11 is embedded in the fitting groove and mechanically fastened to form a detachable fixation, while maintaining the communication between the micropore and the annular negative pressure chamber 20.

[0031] Furthermore, in the above technical solution, the fitting grooves are equidistantly distributed along the circumference of the cutter head 10, and the bottom of the groove and the annular negative pressure cavity 20 are connected by a thin wall, with through holes opened on the thin wall to form an extension of the micropore.

[0032] Furthermore, in the above technical solution, the micropores extend obliquely from the back of the blade 11 toward the cutting edge, with the oblique direction opposite to the rotation direction of the blade 11, so as to generate an adsorption airflow toward the cutting edge under negative pressure.

[0033] Furthermore, in the above technical solution, the rotary joint 30 includes a stationary end 31 and a rotating end 32. The stationary end 31 is connected to an external negative pressure source, and the rotating end 32 is coaxially fixed to the cutter head 10. The two are sealed on the axial end face through an annular sealing ring, so that the negative pressure is transmitted only inside the cutter head 10 without external leakage.

[0034] Furthermore, in the above technical solution, the cross-section of the annular negative pressure cavity 20 is rectangular, the outer peripheral wall of the annular negative pressure cavity 20 is in contact with the root of the blade 11, and the inner peripheral wall of the annular negative pressure cavity 20 is in contact with the mating surface of the rotating end 32 of the rotary joint, forming a continuous negative pressure channel.

[0035] Furthermore, in the above technical solution, the micro-holes on the back of the blade 11 are arranged in an array, and the array area covers the main cutting force area on the back of the blade 11. The diameter of each micro-hole gradually decreases from the root of the blade 11 towards the cutting edge to balance the negative pressure distribution.

[0036] Furthermore, in the above technical solution, the cutter head 10 has annular grooves on both sides of the axial end face, and the sealing ring is embedded in the annular groove to form a bidirectional seal with the end face of the rotary joint 30 to prevent negative pressure side leakage.

[0037] Furthermore, in the above technical solution, the edge of the micro-hole outlet on the back of the blade 11 is rounded to avoid wood fibers accumulating and clogging at the hole opening.

[0038] Furthermore, in the above technical solution, the stationary end 31 of the rotary joint 30 is a fixed sleeve, which is connected to a negative pressure pipe through a flange and remains stationary; the rotating end 32 is a rotating sleeve that is coaxially fixed to the cutter head 10, and its inner hole is connected to the annular negative pressure chamber 20; the stationary end 31 and the rotating end 32 are supported by a double-row angular contact bearing, and the end face is sealed by two parallel annular sealing rings, so that the negative pressure is only transmitted inside the rotating sleeve and the cutter head 10, and the stationary end 31 does not rotate with the cutter head 10.

[0039] First embodiment: This embodiment is installed in the main sawing unit of a high-speed four-sided planer-saw combined production line. This unit needs to longitudinally slit a piece of raw material with a thickness equal to the width of the finished floorboard into multiple pieces in one go. The linear speed is high, the feed rate is large, and the raw material contains hard knots. Under these conditions, traditional blades are prone to cracking at knots, burrs on the board surface, and blade sticking, resulting in machine stoppages and uneven planing allowances on all four sides.

[0040] The cutter head is a single aluminum alloy forging, with an outer diameter adapted to the existing spindle interface. Eight dovetail grooves are milled circumferentially at equal intervals, with the bottom of the grooves connected to the internal annular negative pressure chamber via a 0.9mm thin wall. The cutting inserts are made of standard rectangular carbide strips, with dovetails machined at the root to fit into the grooves, and radially positioned by securing them with two screws on the side. Double rows of micro-holes are drilled on the back of the inserts within 4mm of the cutting edge, with the hole diameter gradually decreasing from 1mm at the root to 0.4mm at the cutting edge, covering the main cutting force area. The negative pressure chamber is connected to a stationary rotary joint via an end-face sealing ring. The rotary joint flange is fixed to the frame, and the negative pressure pipe can be directly connected to the workshop's centralized negative pressure system.

[0041] After startup, the negative pressure system is activated first, followed by the spindle. When the cutter head reaches its operating speed, a stable low pressure is instantly created in the annular negative pressure chamber. As the raw material enters the sawing zone, the wood fibers are adsorbed by micropores and adhere tightly to the back of the blade just before being cut, preventing tearing at knots. The negative pressure airflow continuously removes cutting heat, keeping the blade surface temperature below the resin softening point, significantly reducing adhesion. A production line can run continuously for one shift without blade cleaning. The cut edges are smooth, and the planing allowance on all four sides is reduced from 1mm on each side to less than 0.5mm on a single side, increasing the yield of boards. Changing blades is simple: just loosen two screws, remove the old blade, and insert the new one. Downtime is reduced to less than two minutes, without affecting the production line's cycle time.

[0042] Second embodiment: This embodiment is a portable CNC engraving machine for small studios or on-site renovations, used for grooving, carving, and irregular cutting on solid wood door panels. The equipment is small in size and has limited spindle power. Under these low power and low torque conditions, traditional blades are prone to blackening of the cut and severe burrs on the edges due to poor chip removal and excessive temperature rise, resulting in a large amount of manual sanding work afterwards.

[0043] The cutter head is injection molded from engineering plastic, with an outer diameter only one-third that of Example 1. It retains the annular negative pressure chamber, but the chamber wall thickness is reduced to 0.8mm to reduce weight. Six T-shaped fitting slots are evenly distributed around the circumference. The blade is a foldable, segmented cutter head, each segment 50mm long. The T-shaped tenon at the base quickly engages with the fitting slot and is locked by a spring pin. The micro-holes on the back of the blade have a uniform diameter of 0.5mm and a spacing of 2.5mm, covering the entire width of the cutter head. The negative pressure chamber is connected to a handheld vacuum cleaner via a miniature rotary joint. The vacuum cleaner has a built-in speed control button, allowing real-time adjustment of the negative pressure according to the carving depth.

[0044] Before carving, connect the vacuum cleaner hose and adjust it to medium negative pressure. Then, install the cutter head into the carving machine spindle. During carving, the cutter head sweeps across the wood surface at high speed, and wood chips and heat are instantly absorbed by the micropores, keeping the cut light-colored and free of scorch marks. The heat carried away by the negative pressure airflow keeps the cutter head temperature within an acceptable range, eliminating the need to stop the machine for cooling even during long periods of continuous carving. After carving, the cut edges are almost burr-free, requiring only a simple wipe before proceeding to the next painting process, significantly reducing on-site work time. If a section of the cutter head chipes, the user can remove the corresponding section and replace it with a spare section, eliminating the need to replace the entire blade or readjust the machine, resulting in extremely low maintenance costs.

[0045] Specifically, the principle of this invention is as follows: When an external negative pressure source continuously draws air into the annular negative pressure chamber through a rotary joint, the pressure inside the chamber rapidly drops below atmospheric pressure, creating a stable low-pressure field in the microporous area on the back of the blade. After the wood enters the cutting zone, its surface fibers should curl outwards under the shearing action of the blade, but the adsorption force generated by the low-pressure field presses the fibers back towards the back of the blade. At the moment of shearing, the fibers are bidirectionally constrained, resulting in a clean fracture surface and effectively suppressing chipping and burrs. Simultaneously, the negative pressure airflow enters the chamber along the micropores, carrying away the cutting heat along the way. The temperature at the interface between the blade and the wood decreases, the resin softening point is not breached, and the sticking phenomenon is significantly reduced. The airflow continuously carries away wood chips, keeping the chip removal path unobstructed, reducing the fluctuation of cutting resistance, and consequently reducing equipment vibration. The thin-walled transition structure allows direct connection between the micropores and the negative pressure chamber, minimizing the airflow path and enabling near-instantaneous negative pressure response. The stationary end of the rotary joint is fixed to the frame, while the rotating end is coaxially fixed to the cutter head. Bearings bear radial and axial loads, and two end-face sealing rings prevent negative pressure leakage, ensuring stable negative pressure during high-speed rotation of the cutter head. The detachable fit between the blade root and the fitting groove allows for individual replacement of locally worn blades without affecting the dynamic balance of the cutter head. The gradient aperture design of the micropore array creates a negative pressure gradient decreasing from the root to the cutting edge, matching the distribution of adsorption and cutting forces. This avoids excessive suction that could lead to energy waste while ensuring precise fiber constraint near the cutting edge. The rounded orifices eliminate sharp-angled wire entanglement, preventing sawdust accumulation and ensuring long-term unobstructed micropores. The entire system utilizes three mechanical means—fluid negative pressure, structural sealing, and detachable connection—to achieve active control of wood fibers, real-time heat removal, and rapid blade maintenance. Without adding electronic components, it significantly improves the continuous operation capability and cut quality of automated wood cutting equipment.

Claims

1. A cutting blade for an automated wood cutting device, characterized in that, include: A cutter head positioned around a rotation axis; A blade fixed to the outer periphery of the cutter head and extending radially; An annular negative pressure cavity is formed inside the cutter head and surrounds the axis of rotation; Micropores densely distributed on the back of the blade; A rotary joint clamped between the cutter head and an external negative pressure source; And a sealing ring disposed on the mating surface of the cutter head and the rotary joint; The micropores extend from the back of the blade to the annular negative pressure chamber, allowing the annular negative pressure chamber to be in fluid communication with the space on the back of the blade. The rotary joint continuously introduces negative pressure into the annular negative pressure chamber when the blade disc rotates.

2. The cutting blade of an automated wood cutting device according to claim 1, characterized in that, The outer peripheral wall of the cutter head is provided with a fitting groove that complements the root of the blade. The root of the blade is embedded in the fitting groove and mechanically fastened to form a detachable fixation, while maintaining the communication between the micropore and the annular negative pressure chamber.

3. The cutting blade of an automated wood cutting device according to claim 2, characterized in that, The fitting grooves are evenly distributed along the circumference of the cutter head, and the bottom of the grooves is connected to the annular negative pressure cavity by a thin wall. Through holes are opened on the thin wall to form the extension section of the micropore.

4. The cutting blade of an automated wood cutting device according to claim 3, characterized in that, The micropores extend obliquely from the back of the blade toward the cutting edge, with the oblique direction opposite to the blade rotation direction, so as to generate an adsorption airflow toward the cutting edge under negative pressure.

5. The cutting blade of an automated wood cutting device according to claim 4, characterized in that, The rotary joint includes a stationary end and a rotating end. The stationary end is connected to an external negative pressure source, and the rotating end is coaxially fixed to the cutter head. The two are sealed on the axial end face by an annular sealing ring, so that the negative pressure is transmitted only inside the cutter head and there is no external leakage.

6. The cutting blade of an automated wood cutting device according to claim 5, characterized in that, The annular negative pressure chamber has a rectangular ring-shaped cross-section. The outer peripheral wall of the annular negative pressure chamber is fitted with the root of the blade, and the inner peripheral wall of the annular negative pressure chamber is fitted with the mating surface of the rotating end of the rotary joint, forming a continuous negative pressure channel.

7. The cutting blade of an automated wood cutting device according to claim 6, characterized in that, The micropores on the back of the blade are arranged in an array, and the array area covers the main cutting force area on the back of the blade. The diameter of each micropore gradually decreases from the root of the blade towards the cutting edge to balance the negative pressure distribution.

8. The cutting blade of an automated wood cutting device according to claim 7, characterized in that, The cutter head has annular grooves on both axial end faces. The sealing ring is embedded in the annular grooves and forms a bidirectional seal with the end face of the rotary joint to prevent negative pressure leakage.

9. The cutting blade of an automated wood cutting device according to claim 8, characterized in that, The micro-hole outlet edge on the back of the blade has a rounded transition to prevent wood fibers from accumulating and clogging the opening.

10. The cutting blade of an automated wood cutting device according to claim 9, characterized in that, The stationary end of the rotary joint is a fixed sleeve, which is connected to a negative pressure pipe through a flange and remains stationary; the rotating end is a rotating sleeve that is coaxially fixed to the cutter head, and its inner hole is connected to the annular negative pressure chamber; the stationary end and the rotating end are supported by a double-row angular contact bearing, and the end face is sealed by two parallel annular sealing rings, so that the negative pressure is only transmitted inside the rotating sleeve and the cutter head, and the stationary end does not rotate with the cutter head.

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