Disk saw safety protection system and protection method based on multi-modal sensing

Abstract

The invention discloses a disk saw safety protection system and method based on multi-modal sensing. The disk saw safety protection system comprises a protection saw cover, and a lifting support is installed on one side of a disk saw workbench and connected with the protection saw cover; the first detection sensor is arranged on the lower end face of the protective saw cover and used for recognizing a to-be-cut workpiece and human tissue and detecting the thickness of the to-be-cut workpiece; the second detection sensors are located on the periphery of the disk saw to form a 360-degree monitoring net; the capacitance thin film is arranged on the inner side of the protective saw cover and linked with the second detection sensor, and when it is detected that the human tissue approaches, human tissue recognition is triggered and early warning information is sent out; the safety protection system of the disk saw is based on a multi-mode sensing and dynamic adjusting mechanism, passive shielding is converted into active defense, and through an active sensing and quick response mechanism, the cutting operation risk is remarkably reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and particularly to a safety protection system and method for a circular saw based on multi-modal sensing. Background Art

[0002] In the field of woodworking in construction, circular saws are commonly used equipment that can efficiently cut various types of wood. However, due to the exposed high-speed rotating saw blade, serious accidents are likely to occur. Therefore, a protective cover for a woodworking circular saw has emerged. It is a protective device installed on the circular saw and mainly consists of a cover body, an adjustment device, and a fixing device. The cover body is commonly made of metal thin plates or high-strength plastics, and its shape depends on the size of the saw blade and the structure of the equipment, wrapping the dangerous part of the saw blade. It can partially or completely enclose the saw blade during operation, blocking the contact between the human body and the saw blade, thereby reducing the risk of accidents.

[0003] However, the existing circular saws still have the following problems and disadvantages: (1) Insufficient adaptability: Most of the existing protective covers are of fixed or manually adjustable structures and cannot automatically adjust the height according to the thickness of the wood, resulting in too large a gap between the protective cover and the workpiece during cutting and increasing the risk of sawdust splashing.

[0004] (2) Passive protection: Traditional protective covers rely on physical shielding and lack an active safety mechanism; for example, when an operator's hand enters the dangerous area, the protection action cannot be triggered in time.

[0005] (3) Difficult maintenance: For some adjustable protective covers, structures such as gears and chutes are often used, and the accumulation of sawdust generated during long-term use will cause jamming, resulting in high maintenance costs.

[0006] (4) Low worker compliance: Due to cumbersome operation or poor protection effect, workers often abandon the protective cover, further exacerbating the safety risk. Summary of the Invention

[0007] The purpose of the present invention is to provide a safety protection system and method for a circular saw based on multi-modal sensing in view of the problems existing in the prior art.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is: A safety protection system for a circular saw based on multi-modal sensing, including a protective saw cover, further including: A liftable bracket, which is installed on one side of the circular saw workbench, and the liftable bracket is connected to the protective saw cover; A first detection sensor, which is arranged on the lower end surface of the protective saw cover, is used to identify the workpiece to be cut and human tissue, and detect the thickness of the workpiece to be cut; A plurality of second detection sensors are arranged on the circular saw workbench and located at the periphery of the circular saw to form a 360° monitoring network; A capacitive film is arranged on the inner side of the protective saw cover and is linked with the second detection sensor. When human tissue approaches, it triggers human tissue recognition and issues a warning message. An intelligent controller is electrically connected to the drive motor of the circular saw, the driver of the liftable bracket, the first monitoring sensor, the second detection sensor and the capacitor film, and receives data detected by the first monitoring sensor and feedback information from the second detection sensor and the capacitor film.

[0009] This circular saw safety protection system is based on multi-modal sensing and dynamic adjustment mechanisms, transforming "passive shielding" into "active defense". Through active sensing and rapid response mechanisms, it significantly reduces cutting operation risks and improves processing efficiency.

[0010] On the one hand, the first detection sensor is used to measure thickness and distance, and cooperates with the liftable bracket to complete the automatic adjustment of the protective saw cover; on the other hand, it can also identify human tissue, such as human hands. If a human hand enters the range of the protective saw cover during the opening and closing or height adjustment of the protective saw cover, it can be immediately identified and an alarm can be issued to remind the person to move the hand away. The protective saw cover will not continue to descend to avoid colliding with the hand or pinching the hand. The protective saw cover can continue to descend after the risk of contact. In addition, the first detection sensor can also identify the hand on the circular saw workbench to determine whether it is a workpiece to be cut or a human hand entering the cutting area, and timely feedback information to avoid subsequent safety hazards.

[0011] A number of the second detection sensors are arranged around the circular saw to construct a 360° all-round monitoring network, which can monitor human bodies approaching the cutting area from all directions. In conjunction with the capacitive film on the inside of the protective saw cover, it can more accurately distinguish whether a human body or a workpiece has entered the dangerous area around the saw blade, and cooperate with the intelligent controller to take sound warnings or braking measures to eliminate the danger. By combining multimodal sensing technology (infrared + capacitance) with mechanical protection, a leap from "passive shielding" to "active defense" is achieved.

[0012] Furthermore, the liftable bracket includes a column connected to the circular saw worktable, a crossbeam is provided on the column, a suspension rod is provided at one end of the crossbeam away from the column, and the suspension rod is connected to the protective saw cover; the suspension rod is a lifting suspension rod and / or the column is a lifting column, so as to adjust the height of the protective saw cover and control the distance between it and the workpiece to be cut.

[0013] Further, the first detection sensor is an infrared sensor or a laser sensor, which emits perpendicularly to the circular saw workbench and distinguishes the target object through the difference in reflectivity and dynamic speed analysis. The reflectivity and dynamic speed of different target objects are preset in the intelligent controller. The sensor not only plays a role in distance measurement, but also can identify and distinguish the workpiece to be cut and human tissue in turn. Further, the second detection sensor is an infrared sensor, and multiple groups are arranged around the circular saw at intervals. The distance between the second detection sensor and the edge of the circular saw is not less than 3 cm, and a safety protection area can be formed around the circular saw.

[0014] Further, the capacitive film is attached or embedded on the inner arc surface of the protective saw cover. The capacitive film sets a capacitance change threshold based on the difference in dielectric constant to identify whether there is human tissue entering the working range of the circular saw. The capacitance change threshold is pre-stored in the intelligent controller.

[0015] Further, a composite anti-adhesion layer is also provided on the surface of the capacitive film. The composite anti-adhesion layer includes a conductive bottom layer provided on the surface of the capacitive film and a hydrophobic surface layer on the conductive bottom layer. The setting of the composite anti-adhesion layer can ensure the reliability of the capacitive film detection and also prevent the dust generated by cutting from being adsorbed on the inner surface.

[0016] Further, an alarm is also provided on the protective saw cover, and the alarm is electrically connected to the intelligent controller.

[0017] Further, a negative pressure suction port is provided at the tail of the protective saw cover, and an adapter is provided outside the negative pressure suction port. The adapter is connected with a pipeline and leads to a negative pressure fan. The negative pressure fan shares a control circuit with the drive motor of the circular saw and starts synchronously. The slag generated during the working state is cleaned up, the slag accumulation is reduced, the service life of the equipment is improved, and the equipment maintenance frequency is reduced.

[0018] Further, the protective saw cover is a metal cover with a coating on the surface.

[0019] In some embodiments, the protective saw cover includes an outer frame and an inner visible protective cover provided in the outer frame. The capacitive film is provided on the inner side of the inner visible protective cover.

[0020] A protection method for a circular saw safety protection system based on multi-modal sensing, the protection method includes the following steps: The first detection sensor identifies the workpiece to be cut and detects the thickness of the workpiece to be cut; adjusts the distance between the protective saw cover and the workpiece to be cut to several millimeters; During the spacing adjustment process, if human tissue enters below the protective saw cover, the first detection sensor identifies and feeds back to the intelligent controller, and the intelligent controller issues a first alarm message, warning on-site and stopping the action of the protective saw cover; if there is no abnormality, start the circular saw to start cutting work; During the cutting work process, if human tissue approaches the first safe distance from the saw blade, the intelligent controller issues a second alarm message and gives a warning on-site; if human tissue approaches the second safe distance from the saw blade, the intelligent controller issues a third alarm message, gives a warning on-site and issues an instruction to brake the circular saw.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The circular saw safety protection system of the present invention is based on a multi-modal sensing and dynamic adjustment mechanism, transforming "passive shielding" to "active defense". Through an active sensing and rapid response mechanism, the cutting operation risk is significantly reduced and the processing efficiency is improved; 2. The liftable support can automatically complete the height adjustment of the protective saw cover, adapt to workpieces to be cut with different thicknesses, control the spacing between the protective saw cover and the workpiece to be cut, reduce the slag splashed during the cutting process, so as not to cause harm to nearby workers, and at the same time avoid manual adjustment of the protective saw cover, reducing the safety risk of manual operation; 3. It can identify human tissue, such as a human hand. If a human hand enters the range of the protective saw cover during the opening / closing or height adjustment of the protective saw cover, it can be immediately identified and an alarm is given to remind the person to move the hand away. The protective saw cover will not continue to descend to avoid colliding with or pinching the hand, and the protective saw cover can continue to descend only after the risk contact; 4. A number of the second detection sensors are arranged around the circular saw, which can construct a 360° all-round monitoring network, can monitor humans approaching the cutting area from all directions, and cooperate with the capacitive film inside the protective saw cover to more accurately distinguish whether a human or a workpiece enters the dangerous area around the saw blade, and jointly with the intelligent controller, take sound warning or braking measures to eliminate the danger; 5. Through the setting of the negative pressure suction port, wood chips and impurities generated during the working state can be recycled, reducing wood chip splashing and accumulation, reducing the work environmental pollution, increasing the service life of the equipment, especially effectively improving the working stability of the sensor, and also significantly reducing the influence of air flow fluctuations on the capacitive film sensor; 6. Through the setting of the composite anti-adhesion layer, the reliability of capacitive film detection can be ensured, and it can also prevent the dust generated by cutting from being adsorbed on the inner surface. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of a circular saw safety protection system based on multi-modal sensing of the present invention; Figure 2 It is a structural schematic diagram of the protective saw cover of the safety protection system of the present invention; Figure 3 Internal structure schematic diagram of the protective saw cover of the safety protection system of the present invention; Figure 4 Cross-sectional structure schematic diagram of the protective saw cover of the safety protection system of the present invention; Figure 5 Another structure schematic diagram of the protective saw cover of the safety protection system of the present invention; In the figure: 1, circular saw workbench; 2, circular saw; 3, protective saw cover; 301, outer frame; 302, inner visible protective cover; 4, column; 5, cross beam; 6, suspension rod; 7, first detection sensor; 8, second detection sensor; 9, capacitive film; 10, alarm; 11, negative pressure suction port; 12, negative pressure fan; 13, conductive bottom layer; 14, hydrophobic surface layer; 15, external coating. Specific embodiments

[0023] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Embodiment 1

[0025] As Figures 1 to 3 shown, a circular saw safety protection system based on multi-modal sensing includes a protective saw cover 3, and further includes: A liftable bracket, the liftable bracket is installed on one side of the circular saw workbench 1, and the liftable bracket is connected to the protective saw cover 3; A first detection sensor 7, arranged on the lower end surface of the protective saw cover 3, for identifying the workpiece to be cut and human tissue, and detecting the thickness of the workpiece to be cut; A plurality of second detection sensors 8, arranged on the circular saw workbench 1, located outside the circular saw 2, forming a 360° monitoring network; The capacitive film 9 is arranged inside the protective saw cover 3 and is linked with the second detection sensor 8. When it detects the approach of human tissue, it triggers the recognition of human tissue and sends out a warning message. The intelligent controller is arranged on the workbench of the circular saw. The intelligent controller is electrically connected to the drive motor of the circular saw, the driver of the liftable bracket, the first monitoring sensor, the second detection sensor, and the capacitive film, and receives the data detected by the first monitoring sensor and the feedback information sent by the second detection sensor and the capacitive film.

[0026] Based on the multi-modal sensing and dynamic adjustment mechanism, this circular saw safety protection system transforms from "passive shielding" to "active defense". Through the active sensing and rapid response mechanism, it significantly reduces the cutting operation risk and improves the processing efficiency.

[0027] The liftable bracket can adjust the height of the protective saw cover 3, open and close the protective saw cover 3. Under the functions of thickness detection and distance measurement of the first detection sensor 7, the liftable bracket can automatically complete the height adjustment of the protective saw cover 3 to adapt to workpieces to be cut with different thicknesses, control the distance between the protective saw cover 3 and the workpiece to be cut, reduce the slag splashed out during the cutting process, so as not to cause harm to nearby workers, and at the same time avoid manual adjustment of the protective saw cover, reducing the safety risk of manual operation.

[0028] The first detection sensor 7 is used for thickness measurement and distance measurement on the one hand, and cooperates with the liftable bracket to complete the automatic adjustment of the protective saw cover 3; on the other hand, it can also identify human tissue, such as a human hand. If a human hand enters the range of the protective saw cover during the opening and closing or height adjustment of the protective saw cover 3, it can be immediately identified and an alarm will be issued to remind the person to move the hand away. The protective saw cover will not continue to descend to avoid colliding with or pinching the hand, and the protective saw cover can continue to descend only after the risk contact. Moreover, the first detection sensor 7 can also identify the hand on the circular saw workbench 1 to judge whether it is a workpiece to be cut or a human hand that enters the cutting area, and timely feedback information to avoid subsequent safety hazards.

[0029] A number of the second detection sensors 8 are arranged around the circular saw 2, and can construct a 360° omnidirectional monitoring network, which can monitor humans approaching the cutting area from all directions. Cooperating with the capacitive film inside the protective saw cover, it can more accurately distinguish whether a human or a workpiece enters the dangerous area around the saw blade, and jointly with the intelligent controller, take sound warning or braking measures to eliminate the danger; by combining the multi-modal sensing technology (infrared + capacitance) with mechanical protection, it realizes the leap from "passive shielding" to "active defense".

[0030] The intelligent controller at least includes a chip or a PLC control module, as well as a storage module, a communication module, etc. connected thereto. Through the intelligent controller, messages can be received and some adjustment instructions can be issued, such as controlling the lifting of the liftable bracket, the start and stop of the circular saw, the alarm of the alarm, etc. It can also be connected to a mobile terminal or a control room through WIFI, 5G, etc. for remote monitoring and control.

[0031] Further, the liftable bracket includes a column 4 provided on the side of the circular saw workbench 1. A cross beam 5 is provided on the column 4. A suspension rod 6 is provided at one end of the cross beam 5 away from the column 4. The suspension rod 6 is connected to the protective saw cover 3; the suspension rod 6 is a liftable suspension rod and / or the column 4 is a liftable column.

[0032] The column 4 is provided on one side of the circular saw. The cross beam 5 is parallel to the circular saw workbench 1. Preferably, the cross beam 5 is rotatably provided on the column 4 and can swing to move the protective saw cover away from directly above the circular saw and also move the protective saw cover to directly above the circular saw, improving the adjustment flexibility of the liftable bracket. The lifting of the protective saw cover 3 can be brought about by the telescoping of the suspension rod 6 or the lifting of the column 4. Generally, one of them can be selected.

[0033] In some embodiments, the suspension rod 6 and the column 4 can be simultaneously set as lifting structures. The suspension rod 6 has a small stroke for precise lifting, and the column 4 has a large stroke for lifting. When moving in a large range, the lifting of the column can be used to achieve it. The lifting of the suspension rod can precisely adjust the height of the protective saw cover. This dual-combined lifting structure is more conducive to the height adjustment of the protective saw cover and better controls the distance between it and the workpiece to be cut.

[0034] Further, the first detection sensor 7 is an infrared sensor or a laser sensor, which emits perpendicularly to the circular saw workbench and distinguishes the target object through the difference in reflectivity and dynamic speed analysis. Different reflectivities and dynamic speeds of different target objects are preset in the intelligent controller.

[0035] Further, the second detection sensor 8 is an infrared sensor, and multiple groups are provided and arranged around the circular saw at intervals.

[0036] If it is only for distance measurement or thickness measurement, the first detection sensor can be various sensors with distance measurement functions, such as infrared, laser, and ultrasonic. When both the first detection sensor 7 and the second detection sensor 8 are infrared sensors, by setting the reflectivity and dynamic speed, their functions are not only for distance measurement, but also can be used to identify and distinguish the workpiece to be cut and human tissue in sequence.

[0037] For example, the reflectivity of the human hand is preset within 30% - 50% in the intelligent controller, and the reflectivity of wood is within 5% - 15%. The dynamic speed of the human hand is generally greater than 0.5 m / s, while the dynamic speed of wood is generally less than 0.1 m / s. Through these differential settings and analyses, the sensor can identify and distinguish whether the target object is wood or a hand, so as to timely determine whether a human hand enters the cutting area.

[0038] The monitoring network composed of several second detection sensors 8 can monitor the situation within a certain range around the circular saw 2, and a human hand can be detected in time when it approaches this area.

[0039] The distance between the second detection sensor 8 and the edge of the circular saw 2 is not less than 3 cm. In this embodiment, 6 groups of the second detection sensors (infrared sensors) are arranged in a ring at a position 7 cm away from the edge of the circular saw 2. It has a detection range on both sides at this 7 cm distance, which can prevent the hand from being detected only when it is too close.

[0040] Furthermore, the capacitive film 9 is attached to or embedded in the inner arc surface of the protective saw cover 3. The capacitive film 9 sets a capacitance change threshold based on the dielectric constant difference to identify whether there is human tissue entering the working range of the circular saw. The capacitance change threshold is pre - stored in the intelligent controller.

[0041] In this embodiment, based on the dielectric constant difference (the dielectric constant of the human body is significantly higher than that of wood), a capacitance change threshold is set to distinguish whether a human hand enters the area around the circular saw blade. The capacitive film can play a role in preventing accidental contact of the hand.

[0042] Since human tissue contains a large amount of water and ionic substances. For example, the dielectric constant of muscle is 56 - 66.2 (frequency 100KHz), the dielectric constant of fat is 11.3 - 12.7 (frequency 900KHz), while the dielectric constant of wood is between 2 - 5. For example, the dielectric constant of pine is 2.5, red oak is 3.2, yew is 2.8, white oak is 3.6, birch is 2.6, and plywood is 3.8 - 4.5. When the human body comes into contact with wood, due to the certain conductivity and dielectric properties of the human body, the original electric field distribution will be changed, resulting in a change in the dielectric constant. This change can be detected by a capacitance sensor. The capacitance change threshold refers to the situation where when this change reaches a certain degree, the sensor can accurately identify the human body and wood. For example, the capacitance change threshold for the hand is set > 5 pF, and the capacitance change threshold for wood is set < 0.5 pF.

[0043] Furthermore, combined with Figure 4As shown, a composite anti-adhesion layer is further provided on the surface of the capacitive film 9. The composite anti-adhesion layer includes a conductive bottom layer 13 provided on the surface of the capacitive film, and a hydrophobic surface layer 14 on the conductive bottom layer 13.

[0044] The setting of the composite anti-adhesion layer can ensure the reliability of capacitive film detection and also avoid the adsorption of dust generated by cutting on the inner surface.

[0045] In this embodiment, the conductive bottom layer 13 is an epoxy resin-based conductive coating with a coating thickness of 50 - 80 μm and a surface resistance < 1×10³ Ω, which can be used to conduct static electricity and prevent the static adsorption of wood chips; the hydrophobic surface layer 14 is a carbon fluoride nanotube hydrophobic coating with a thickness of 10 - 20 μm and a contact angle > 150°, and it blocks the adhesion of wood chips through its low surface energy property (surface energy < 20 mN / m).

[0046] Furthermore, an alarm 10 is further provided on the protective saw cover 3, and the alarm 10 is electrically connected to the intelligent controller. The alarm 10 can be a voice alarm and a light alarm, which can emit voice prompts and light flashes, and can well remind the on-site staff.

[0047] Furthermore, a negative pressure suction port 11 is provided at the tail of the protective saw cover 3. A connector is provided outside the negative pressure suction port 11, and the connector is connected to a pipeline and leads to a negative pressure fan 12. The negative pressure fan 12 shares a control circuit with the drive motor of the circular saw 2 and starts synchronously.

[0048] The setting of the negative pressure suction port 11 can recover the wood chips and impurities generated during the working state, reduce the splashing and accumulation of wood chips, reduce the working environment pollution, improve the service life of the equipment, and especially effectively improve the working stability of the sensor. It can also significantly reduce the influence of airflow fluctuation on the capacitive film sensor.

[0049] Furthermore, the protective saw cover 3 is a metal cover with an external coating 15 on its surface, and the capacitive film 9 is arranged on the inner surface of the metal cover. The coating on the outer surface can be an anti-corrosion coating, a wear-resistant coating, etc.

[0050] The protective saw cover 3 can also be a polycarbonate cover, which has high strength and impact resistance, can protect the staff from flying wood chips, and can be made transparent for easy observation of the cutting situation.

[0051] In some embodiments, such as Figure 5As shown, the protective saw cover 3 includes an outer frame 301 and an inner visible protective cover 302 disposed within the outer frame 301. The capacitive film 9 is disposed on the inner side of the inner visible protective cover 302. The inner visible protective cover 302 can be made of polycarbonate or plexiglass. The outer frame 301 has good structural strength, which can protect the inner visible protective cover and is also convenient for installing and connecting these sensors, alarms, and negative pressure suction ports. Embodiment 2

[0052] A protection method for a circular saw safety protection system based on multi-modal sensing, the protection method comprising the following steps: The first detection sensor identifies the workpiece to be cut, detects the thickness of the workpiece to be cut, and obtains the spacing information between the protective saw cover and the workpiece to be cut. After the intelligent controller obtains the spacing information, it issues an instruction to adjust the spacing between the protective saw cover and the workpiece to be cut to several millimeters. The reserved gap space can suck in air, which is beneficial to air flow and heat dissipation during negative pressure adsorption.

[0053] During the spacing adjustment process, if human tissue (such as a hand) enters below the protective saw cover, the first detection sensor identifies and feeds back to the intelligent controller. The intelligent controller issues a first alarm message, warns on-site and stops the operation of the protective saw cover; if there is no abnormality, after the protective saw cover automatically adjusts the spacing, the circular saw is started to start the cutting work.

[0054] During the cutting work process, if human tissue approaches the first safety distance from the saw blade, the second detection sensor can identify the approaching of the human body. The intelligent controller obtains the feedback information sent by the second detection sensor and issues a second alarm message to warn on-site; if human tissue approaches the second safety distance from the saw blade, the second detection sensor and the capacitive film are jointly triggered. The intelligent controller obtains the feedback information sent by the second detection sensor and issues a third alarm message, warns on-site and issues an instruction to brake the circular saw, and the protective saw cover presses down to close the gap of several millimeters.

[0055] The first safety distance is 6-10 cm from the circular saw. This is a relatively outer distance. Generally, the circular saw will not cause harm to the human body within this distance. However, this distance will trigger this protection system to remind people to pay attention to safety to avoid continuing to approach the circular saw and causing safety problems. Therefore, the alarm will give a safety alarm after receiving this information.

[0056] The second safety distance is 2 - 6 cm from the circular saw. In particular, when it is less than 5 cm, the safety risk increases sharply. When this protection system detects this situation, not only a warning should be issued, but also corresponding active protection measures should be taken, that is, braking the circular saw to reduce the rotation speed, and at the same time pressing down the protective saw cover to close the clearance space and prevent fingers from entering. This approach can, to a certain extent, well avoid the non-standard operations of the staff (such as not using the protective saw cover for convenience). If the safety specifications are not followed, the cutting operation cannot be carried out.

[0057] Taking the cutting of a 30 - mm - thick wooden formwork as an example, the present protection method is further described; (1) The infrared sensor at the front end of the protective saw cover scans the thickness of the wooden formwork and automatically adjusts the protective saw cover to a position 8 mm away from the wooden formwork; (2) When the hand approaches the circular saw by about 8 cm, this protection system identifies this situation and emits a warning sound; (3) When the hand approaches the circular saw by about 4 cm, this protection system identifies this situation, emits a warning sound, and at the same time brakes the saw blade of the circular saw and presses down the protective saw cover; (4) During the working process, the negative - pressure fan runs synchronously, and the negative - pressure suction port adsorbs the wood chips generated during the cutting process, reducing the splashing and accumulation of wood chips.

[0058] Through the multi - sensor collaboration, dynamic adjustment of the protective saw cover and intelligent control system of the present invention, the passive defects of the traditional circular - saw protection device are effectively solved, and the safety performance of the circular saw in use is greatly improved.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circular saw safety protection system based on multimodal sensing, comprising a protective saw cover, characterized in that: Also includes: A liftable bracket, the liftable bracket is installed on one side of the circular saw workbench, and the liftable bracket is connected to the protective saw cover; A first detection sensor is disposed on the lower end surface of the protective saw cover and is used to identify the workpiece to be cut and human tissue, and detect the thickness of the workpiece to be cut; A plurality of second detection sensors are arranged on the circular saw workbench and located at the periphery of the circular saw to form a 360° monitoring network; A capacitive film is arranged on the inner side of the protective saw cover and is linked with the second detection sensor. When human tissue approaches, it triggers human tissue recognition and issues a warning message. An intelligent controller is electrically connected to the drive motor of the circular saw, the driver of the liftable bracket, the first monitoring sensor, the second detection sensor and the capacitor film, and receives data detected by the first monitoring sensor and feedback information from the second detection sensor and the capacitor film.

2. The circular saw safety protection system based on multimodal sensing according to claim 1, characterized in that: The liftable bracket comprises a column connected to the circular saw worktable, a crossbeam is arranged on the column, a suspension rod is arranged at one end of the crossbeam away from the column, and the suspension rod is connected to the protective saw cover; the suspension rod is a lifting suspension rod and / or the column is a lifting column.

3. The circular saw safety protection system based on multi-modal sensing according to claim 1 is characterized in that: The first detection sensor is an infrared sensor or a laser sensor, which emits perpendicularly to the circular saw worktable and distinguishes the target object through reflectivity difference and dynamic speed analysis. The reflectivity and dynamic speed of different target objects are preset in the intelligent controller.

4. The circular saw safety protection system based on multi-modal sensing according to claim 1, characterized in that: The second detection sensor is an infrared sensor, and is provided in multiple groups and arranged around the circular saw at intervals. The second detection sensor is not less than 3 cm away from the edge of the circular saw.

5. The circular saw safety protection system based on multi-modal sensing according to claim 1, characterized in that: The capacitive film is attached to or embedded on the inner curved surface of the protective saw cover. The capacitive film sets a capacitance change threshold based on the dielectric constant difference to identify whether human tissue enters the working range of the circular saw. The capacitance change threshold is pre-stored in the intelligent controller.

6. The circular saw safety protection system based on multi-modal sensing according to claim 1, characterized in that: The surface of the capacitor film is also provided with a composite anti-adhesion layer, and the composite anti-adhesion layer comprises a conductive bottom layer arranged on the surface of the capacitor film, and a hydrophobic surface layer on the conductive bottom layer.

7. The circular saw safety protection system based on multi-modal sensing according to claim 1, characterized in that: The protective saw cover is also provided with an alarm, and the alarm is electrically connected to the intelligent controller.

8. The circular saw safety protection system based on multi-modal sensing according to claim 1, characterized in that: A negative pressure suction port is also provided at the tail of the protective saw cover, and an adapter is provided outside the negative pressure suction port. The adapter is connected with a pipeline and leads to a negative pressure fan. The negative pressure fan shares a control circuit with the driving motor of the circular saw and starts synchronously.

9. The circular saw safety protection system based on multi-modal sensing according to claim 1, characterized in that: The saw protection cover is a metal cover with a coating on the surface, or the saw protection cover includes an outer frame and an inner visible protective cover arranged in the outer frame, and the capacitor film is arranged on the inner side of the inner visible protective cover.

10. A protection method for a circular saw safety protection system based on multi-modal sensing according to any one of claims 1 to 9, characterized in that: The protection method comprises the following steps: The first detection sensor identifies the workpiece to be cut and detects the thickness of the workpiece to be cut; the distance between the protective saw cover and the workpiece to be cut is adjusted to several millimeters; During the spacing adjustment process, if human tissue enters below the protective saw cover, the first detection sensor identifies it and feeds back to the intelligent controller, and the intelligent controller issues a first alarm message, issues an on-site warning, and stops the action of the protective saw cover; If there is no abnormality, start the circular saw to start cutting; During the cutting process, if human tissue approaches the first safety distance of the saw blade, the intelligent controller sends out a second alarm message and issues an on-site warning; If human tissue approaches the second safety distance of the saw blade, the intelligent controller sends out a third alarm message, issues an on-site warning and issues a command to brake the circular saw.

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