Intelligent electric tool with protective device

Abstract

The present invention discloses an intelligent electric tool with a protective device, including a tool, a motor, a circuit control device, a tool detection device and an automatic protection device, wherein the circuit control device includes a relay assembly, a control switch, a speed regulator and a reversing switch, wherein the speed regulator and the reversing switch are connected to the motor, wherein the motor is connected to the relay assembly, wherein the relay assembly is connected to the control switch, wherein the control switch includes a metal contact piece, a metal joint and a switch button, wherein the relay assembly does not contact the switch button in a power-on state, and wherein the relay assembly contacts the switch button in a power-off state to control the control switch to be disconnected. Power-off protection is realized by designing a circuit switch, and defects such as cracks, notches and cards of the tool are detected and identified by a sensor detection device, and timely protection measures are provided to the electric tool by an automatic protection device to avoid failures and dangers during use.

Description

Technical field:

[0001] The invention relates to the field of electric tools, and in particular to an intelligent electric tool with a protective device. Background technology:

[0002] At present, when a power tool on the market is in use, once a power outage occurs, the power tool will stop running, and the switch of the power tool is still in the on state. If a call comes on, the power tool will start automatically. If the power tool is placed in an unreasonable position or the user is not careful when holding the device, the tool or drill bit that suddenly runs at high speed may accidentally injure the user or objects that may come into contact with it, causing damage, which poses a great danger. In order to prevent the power tool from starting suddenly when a call comes on, the only way is to manually turn off the switch button in advance, but many users will forget this operation during actual use, so there is a certain safety risk. In addition, some power tools on the market, such as the grinding wheels used in cutting machines, may have gaps, cracks, defects, uneven force and shaking during use. If not discovered in time, it is likely to cause the grinding wheel to break in the next stage, causing flying pieces, which will cause danger.

[0003] Therefore, in the field of power tools, there is an urgent need for an intelligent power tool with a protective device. The intelligent protective device can not only have the function of power-off protection, but also detect hidden defects such as cracks, notches, and jams in the tool, and provide timely protection measures to avoid failures and dangers during use. Summary of the invention:

[0004] The purpose of the present invention is to provide an intelligent electric tool with a protective device, which realizes power-off protection through circuit switch design, and detects and identifies hidden defects such as cracks, notches, and jams of the tool through a sensor detection device, and provides timely protection measures for the electric tool through an automatic protection device to avoid malfunctions and dangers during use.

[0005] The present invention provides the following specific technical solutions:

[0006] An intelligent electric tool with a protective device, comprising a tool, a motor, a circuit control device, a tool detection device and an automatic protection device, wherein the circuit control device comprises a relay assembly, a control switch, a speed regulator and a reversing switch, wherein the speed regulator and the reversing switch are connected to the motor, wherein the motor is connected to the relay assembly, wherein the relay assembly is connected to the control switch, wherein the control switch comprises a metal contact sheet, a metal joint and a switch button, wherein the relay assembly does not contact the switch button in a power-on state, and contacts the switch button in a power-off state to control the control switch to be disconnected;

[0007] The tool detection device includes an optical fiber sensor, a speed sensor and a vibration sensor. The optical fiber sensor is attached to the tool surface along the annular circumference. A plurality of speed sensors are evenly distributed on the tool surface along the tool axis toward the outer edge of the tool. The vibration sensor is fixed near the tool axis.

[0008] The automatic protection device includes a large fan-shaped box cover and a small fan-shaped box cover, and the large fan-shaped box cover and the small fan-shaped box cover are outside the periphery of the tool, and the center of the large fan-shaped box cover and the small fan-shaped box cover coincide with the center of the rotating shaft of the tool. The large fan-shaped box cover is fixedly connected to the outside of the motor, and the small fan-shaped box cover is rotatably nested in the large fan-shaped box cover. An electric limit lock is installed on the large fan-shaped box cover, and the electric limit lock is clamped with one end of the small fan-shaped box cover, and the electric limit lock is electrically connected to the tool detection device.

[0009] As a further improvement of the present invention, the relay assembly includes a bracket, a first spring, an electromagnet, a coil, and an armature. The electromagnet is fixed on the base of the bracket, a coil is wound around the outer periphery of the electromagnet from top to bottom, the armature is rotatably fixed to the upper end of the bracket, a first spring is provided between the armature and the base of the bracket and on a side away from the electromagnet, and a top block is provided above the armature and on a side close to the electromagnet, and the top block can control the movement of the switch button.

[0010] As a further improvement of the present invention, a second spring is connected to one side of the metal contact piece, and the second spring is fixed on a fixed block inside the power tool. The metal contact piece is separated from the metal connector under the action of the second spring, and the switch button is pressed to press the metal contact piece to contact the metal connector.

[0011] Furthermore, the electric tool also includes a casing, a switch hole is formed on the casing, the switch button passes through the switch hole, the end of the switch button located inside the casing is a beveled end, and the top block contacts the inclined surface of the beveled end when it pops up, and the end of the switch button located outside the casing of the electric tool is provided with an annular safety buckle.

[0012] As a further improvement of the present invention, the casing is symmetrically provided with two semicircular grooves in the thickness direction, a through hole is provided in the middle section of the switch button, limiting protrusions are respectively nested at the openings of the through holes, a third spring is connected between the limiting protrusions, and the limiting protrusions are clamped in the semicircular grooves.

[0013] As a further improvement of the present invention, rotating seats are fixed on both sides of the middle section of the switch button, and swing rods are rotatably connected to the rotating seats respectively. A limiting plate is fixed to one end of the swing rod, and an ear plate is fixed to the limiting plate. The ear plate is hinged to the rotating seat, and a sliding groove is provided at the other end of the swing rod, and a fixed shaft is passed through the sliding groove. The fixed shaft is fixedly installed inside the casing, and a fourth spring is sleeved on the swing rod between the limiting plate and the fixed shaft.

[0014] As a further improvement of the present invention, the fan-shaped angle of the large fan-shaped box cover is 180°-270°, and the fan-shaped angle of the small fan-shaped box cover is 60°-180°. When the small fan-shaped box cover is fully opened, it forms a 360° complete disc box cover with the large fan-shaped box cover.

[0015] As a further improvement of the present invention, the ends of the large fan-shaped box cover are respectively provided with inner folding edges, and the ends of the small fan-shaped box cover are respectively provided with large outer folding edges and small outer folding edges, the large outer folding edge is engaged with the electric limit lock, and during the rotation of the small fan-shaped box cover, the small outer folding edge does not contact the inner folding edge, and the large outer folding edge contacts the inner folding edge for limiting and fixing.

[0016] As a further improvement of the present invention, the electric limit lock includes an electric telescopic rod, a fifth spring and a fixed plate. The electric telescopic rod is fixed on the box wall of the large fan-shaped box cover, and the fixed plate is fixed on the inner side of the box wall of the large fan-shaped box cover. The fifth spring is installed on the fixed plate. When the small fan-shaped box cover is clamped with the electric telescopic rod, the fifth spring contacts the large outer folded edge of the small fan-shaped box cover in a compressed state.

[0017] Furthermore, the small fan-shaped box cover and the electric limit lock are two groups in number and are symmetrically arranged. The small fan-shaped box cover pops up and opens from the left and right sides respectively, and the small outer folded edge ends of the small fan-shaped box cover are respectively provided with magnets.

[0018] As a further improvement of the present invention, the motor includes a stator winding and a rotor, the speed regulator is electrically connected to the tool detection device, and the speed regulator controls the rotation speed of the rotor.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) The intelligent electric tool of the present invention provides power-off protection by providing a circuit control device. Through the combined design of the relay component and the control switch, there is no need to set a reset switch when providing power-off protection, and the redundant step of manually turning off the switch after power failure is omitted. The operation and stop of the electric tool can be controlled by a switch button regardless of the power-on or power-off state, and the operation is safe, simple and efficient.

[0021] (2) The intelligent electric tool of the present invention is provided with a tool detection device, which automatically identifies whether the tool has cracks, notches, jams and other hidden defects based on the information detected by the optical fiber sensor, speed sensor and vibration sensor, so as to replace the tool in time and avoid accidental injuries during use;

[0022] (3) The intelligent electric tool of the present invention is provided with an automatic protection device and large and small fan-shaped box covers on the outside of the tool. The fixed and rotatable combination design provides an effective protection space, and based on the tool safety hazard information monitored by the tool detection device, the small fan-shaped box cover can be automatically opened to fully lock and protect the tool, thereby preventing the tool from generating flying pieces that may accidentally injure others or other objects. Description of the drawings:

[0023] For ease of explanation, the present invention is described in detail with reference to the following specific embodiments and accompanying drawings.

[0024] Figure 1 Schematic diagram of the overall circuit of the intelligent electric tool of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the circuit control device of the intelligent electric tool of the present invention.

[0026] Figure 3 It is a structural schematic diagram of a circuit control device of another embodiment of the intelligent electric tool of the present invention.

[0027] Figure 4 It is a schematic diagram of the overall structure of the intelligent electric tool of the present invention when the small fan-shaped box cover is not opened.

[0028] Figure 5 It is a schematic diagram of the overall structure of the intelligent electric tool of the present invention when the small fan-shaped box cover is opened.

[0029] Figure 6 It is a cross-sectional view of the automatic protection device of the intelligent electric tool of the present invention when the small fan-shaped box cover is not opened.

[0030] Figure 7 It is a cross-sectional view of the automatic protection device of the intelligent electric tool of the present invention when the small fan-shaped box cover is in an open state. Specific implementation method:

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] It should be noted that when an element is referred to as being "fixed", "mounted", "connected" or "disposed" with another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation in the specification, and therefore cannot be understood as limiting the present invention.

[0033] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0034] The present invention will be further described below with reference to the embodiments given in the accompanying drawings:

[0035] Reference Figure 1-7 , an intelligent electric tool with a protective device, comprising a tool 1, a motor 2, a circuit control device 3, a tool detection device 4 and an automatic protection device 5, the circuit control device 3 comprising a relay assembly 6, a control switch 7, a speed regulator 8 and a reversing switch 9, the speed regulator 8 and the reversing switch 9 are connected to the motor 2, the motor 2 is connected to the relay assembly 6, the relay assembly 6 is connected to the control switch 7, the control switch 7 comprises a metal contact sheet 10, a metal joint 11 and a switch button 12, the relay assembly 6 is not in contact with the switch button 12 when powered on, and the relay assembly 6 is in contact with the switch button 12 when powered off to control the control switch 7 to be disconnected.

[0036] Through the combined design of the relay assembly 6 and the control switch 7, there is no need to set up a reset switch separately when providing power-off protection, and the unnecessary step of manually turning off the switch after power-off is omitted. A switch button 12 can control the operation and stop of the power tool regardless of whether the power is on or off, and the operation is safe, simple and efficient.

[0037] The tool detection device 4 includes an optical fiber sensor 13, a speed sensor 14 and a vibration sensor 15. The optical fiber sensor 13 is circumferentially attached to the surface of the tool 1, and a plurality of speed sensors 14 are evenly distributed on the surface of the tool 1 along the axis of the tool 1 toward the outer edge of the tool 1. The vibration sensor 15 is fixed near the axis of the tool 1.

[0038] By setting up a tool detection device 4, a fiber optic sensor 13 can be used to effectively detect cracks. The optical fiber is embedded in the surface of the tool 1, and the detection unit of the fiber optic sensor 13 emits a short light pulse into the optical fiber. When a crack occurs, that is, the stress at this point in the tool 1 changes, it will cause changes in the fiber grating period and the core refractive index, thereby detecting changes in the wavelength of the optical fiber reflected light. Based on the above change information, it can be identified whether the tool 1 has a crack; the speed sensor 14 can detect different tangential speeds of the tool 1 along the radial direction. If a notch appears in the tool 1, the speed detected by the speed sensor 14 here will change cubically. Based on the speed change information detected by the speed sensor 14, it can be identified whether the tool 1 has a notch; the vibration sensor 15 can detect the subtle vibrations generated when the tool 1 contacts foreign objects or has contact problems with the body parts of the power tool during operation. Considering the intensity of the sensitive detection amplitude, the detection effect is more obvious at a position near the axis of the tool 1. Based on the vibration information detected by the vibration sensor 15, it can be identified whether the tool 1 has problems such as jamming.

[0039] The automatic protection device 5 includes a large fan-shaped box cover 16 and a small fan-shaped box cover 17, and the large fan-shaped box cover 16 and the small fan-shaped box cover 17 are outwardly wrapped around the outer periphery of the tool 1, and the centers of the large fan-shaped box cover 16 and the small fan-shaped box cover 17 coincide with the center of the rotating shaft of the tool 1, the large fan-shaped box cover 16 is fixedly connected to the outer side of the motor 2, and the small fan-shaped box cover 17 is rotatably nested in the large fan-shaped box cover 16, and an electric limit lock 18 is installed on the large fan-shaped box cover 16, and the electric limit lock 18 is clamped with one end of the small fan-shaped box cover 17, and the electric limit lock 18 is electrically connected to the tool detection device 4.

[0040] By setting an automatic protection device 5, a fan-shaped box cover is set on the outside of the tool 1, and the large fan-shaped box cover 16 is fixed. It can itself block a large area of ​​​​the material debris splashed when the tool 1 processes the workpiece and the particles produced by the wear of the tool 1 to avoid splashing everywhere and accidentally injuring others. On this basis, a rotatable small fan-shaped box cover 17 is added for a combined design, which provides a larger and more effective protection space. The intelligent power tool can control the electric limit lock 18 in time to automatically open the small fan-shaped box cover 17 based on the safety hazard information of the tool 1 monitored by various sensors of the tool detection device 4, and fully lock the tool 1 to protect it, so as to avoid the tool 1 from producing flying pieces that accidentally injure others or other objects.

[0041] In some embodiments of the present invention, Figure 2As shown, the relay assembly 6 includes a bracket 19, a first spring 20, an electromagnet 21, a coil 22, and an armature 23. The electromagnet 21 is fixed to the base of the bracket 19, and the coil 22 is wound around the periphery of the electromagnet 21 from top to bottom. The armature 23 is rotatably fixed to the upper end of the bracket 19. A first spring 20 is provided between the armature 23 and the base of the bracket 19 and on a side away from the electromagnet 21. A top block 24 is provided above the armature 23 and on a side close to the electromagnet 21. The top block 24 can control the movement of the switch button 12.

[0042] The relay assembly 6 is connected to the control switch 7. When the circuit is in the power-on state, the electromagnet 21 generates magnetism surrounded by the coil 22, and the armature 23 overcomes the pulling force of the first spring 20 and attracts the electromagnet 21. At this time, the top block 24 at the end of the armature 23 does not contact the switch button 12; when the circuit is in the power-off state, the electromagnet 21 loses its magnetism, and the armature 23 tilts up under the pulling force of the first spring 20. At this time, the top block 24 at the end of the armature 23 supports the switch button 12, and the control switch 7 button moves outward, that is, the switch button 12 is turned off, thereby playing a role in power-off protection. The circuit design here is to connect the relay assembly 6 and the control switch 7 in series for integrated control, without the need to set a reset switch separately, and also saves the redundant step of manually turning off the switch after power failure, so that a switch button 12 can control the operation and stop of the power tool regardless of the power-on or power-off state, and the operation is safe, simple and efficient.

[0043] In this embodiment, a second spring 25 is connected to one side of the metal contact piece 10, and the second spring 25 is fixed on a fixed block 26 inside the power tool. The metal contact piece 10 is separated from the metal connector 11 under the action of the second spring 25, and the switch button 12 is pressed to support the metal contact piece 10 and contact the metal connector 11.

[0044] The function of a simple switch is realized by the contact between the metal contact piece 10 and the metal joint 11 , but under the action of the second spring 25 , the two are basically in a separated state, and the control switch 7 is closed only when the switch button 12 presses against the metal contact piece 10 .

[0045] In this embodiment, the electric tool also includes a housing 27, a switch hole is opened on the housing 27, the switch button 12 passes through the switch hole, the end of the switch button 12 located inside the housing 27 is a beveled end, and the top block 24 contacts the inclined surface of the beveled end when it pops up, and the end of the switch button 12 located outside the electric tool housing 27 is provided with a ring-shaped safety buckle 28.

[0046] The design of the beveled end at the end of the switch button 12 makes it easier for the top block 24 to lift the switch button 12 and move it, so as to quickly close the switch button 12. It also allows the user to close the switch button 12 by themselves by simply turning off the power when no tools are used, without having to manually close the switch button 12 in advance. The press-type annular safety buckle 28 can not only limit the switch button 12 outside the housing 27, but also when the user no longer uses the power tool, in addition to turning off the power or unplugging the power supply to close the switch button 12, the annular safety buckle 28 can be pulled outward to close it, thereby ensuring the safety-off state of the power tool.

[0047] In some embodiments of the present invention, Figure 2 As shown, the housing 27 is symmetrically provided with two semicircular grooves in the thickness direction, and a through hole is provided in the middle section of the switch button 12. Limiting protrusions 29 are respectively nested at the openings of the through holes. A third spring 30 is connected between the limiting protrusions 29, and the limiting protrusions 29 are clamped with the semicircular grooves.

[0048] The position locking of the switch button 12 in the open and closed states is achieved through the movable engagement and limiting control of the limiting protrusion 29 and the semicircular groove. When the switch button 12 moves toward the outside of the housing 27, the limiting protrusions 29 on both sides of the switch button 12 will squeeze the third spring 30 to shrink inward, so that the limiting protrusion 29 can quickly slide into the semicircular groove at the rear end, and at this time the third spring 30 returns to the rebound state, and the limiting protrusion 29 presses against the semicircular groove to lock the position.

[0049] In another embodiment, Figure 3 As shown, rotating seats 31 are fixed on both sides of the middle section of the switch button 12, and swing rods 32 are rotatably connected to the rotating seats 31 respectively. A limiting plate 33 is fixed to one end of the swing rod 32, and an ear plate 34 is fixed to the limiting plate 33. The ear plate 34 is hinged to the rotating seat 31. A sliding groove is provided at the other end of the swing rod 32, and a fixed shaft 35 is passed through the sliding groove. The fixed shaft 35 is fixedly installed inside the housing 27, and a fourth spring 36 is sleeved on the swing rod 32 between the limiting plate 33 and the fixed shaft 35.

[0050] Through the combination of the swing rod 32, the fixed shaft 35 and the fourth spring 36, the switch button 12 overcomes the spring resistance and moves to the spring rebound limit position during the movement process, thereby realizing the position locking of the switch button 12 in the open and closed states. When the switch button 12 moves toward the outside of the housing 27, the lower end of the swing rod 32 will move accordingly. Since the position of the fixed shaft 35 is stationary, that is, the upper end of the swing rod 32 is basically stationary, and only slides with the fixed shaft 35 in the sliding groove. During the movement, the distance between the fixed shaft 35 and the limit plate 33 at the lower end of the swing rod 32 will change, and the fourth spring 36 will be compressed first, and then under the action of the spring rebound, the swing rod 32 will drive the switch button 12 to move to the position of the original length of the spring, that is, the position of the final switch button 12 in the closed state.

[0051] In some embodiments of the present invention, Figure 4-7 As shown, the fan-shaped angle of the large fan-shaped box cover 16 is 180°-270°, and the fan-shaped angle of the small fan-shaped box cover 17 is 60°-180°. When the small fan-shaped box cover 17 is fully opened, it forms a 360° complete disc box cover with the large fan-shaped box cover 16.

[0052] By setting a large area of ​​fixed large fan-shaped box cover 16, the shielding range of flying chips and particles during the operation of the tool 1 is improved. The combination design of adding a small fan-shaped box cover 17 forms a complete disc protection cover, which can fully lock and protect the tool 1 to prevent the tool 1 from accidentally injuring others or other objects with flying chips. In addition, the difference in the size of the angle between the large fan-shaped box cover 16 and the small fan-shaped box cover 17, that is, the difference in the fan-shaped area, is considered to increase the area of ​​the fixed protection area, and the small fan-shaped box cover is lighter and more convenient during the rotation process.

[0053] In this embodiment, the ends of the large fan-shaped box cover 16 are respectively provided with inner folding edges 37, and the ends of the small fan-shaped box cover 17 are respectively provided with large outer folding edges 38 and small outer folding edges 39. The large outer folding edge 38 is engaged with the electric limit lock 18. During the rotation of the small fan-shaped box cover 17, the small outer folding edge 39 does not contact the inner folding edge 37, and the large outer folding edge 38 contacts the inner folding edge 37 for limiting and fixing.

[0054] The inner folded edge 37 at the end of the large fan-shaped box cover 16 and the large outer folded edge 38 at the end of the small fan-shaped box cover 17 are limited and cooperated to ensure that the small fan-shaped box cover 17 can still maintain a fixed connection with the large fan-shaped box cover 16 in the open state, avoiding the area with a certain gap between the two after disconnection, which cannot provide effective protection. The different designs of the large and small folded edges are to ensure the smooth rotation of the small fan-shaped box cover 17.

[0055] In this embodiment, the electric limit lock 18 includes an electric telescopic rod 40, a fifth spring 41 and a fixed plate 42. The electric telescopic rod 40 is fixed on the box wall of the large fan-shaped box cover 16, and the fixed plate 42 is fixed on the inner side of the box wall of the large fan-shaped box cover 16. The fifth spring 41 is installed on the fixed plate 42. When the small fan-shaped box cover 17 is clamped with the electric telescopic rod 40, the fifth spring 41 contacts the large outer folding edge 38 of the small fan-shaped box cover 17 in a compressed state.

[0056] The electric telescopic rod 40 is used as a limit locking switch to control the rotation of the small fan-shaped box cover 17. The small fan-shaped box cover 17 will rotate by itself under the action of gravity. The fifth spring 41 is added here to drive the small fan-shaped box cover 17 to rotate quickly through elastic force, thereby increasing the opening speed of the small fan-shaped box cover 17 and realizing the protection function more efficiently.

[0057] In this embodiment, the small fan-shaped box cover 17 and the electric limit lock 18 are two groups in number and are symmetrically arranged. The small fan-shaped box cover 17 pops up and opens from the left and right sides respectively, and magnets are provided at the ends of the small outer folded edges 39 of the small fan-shaped box cover 17.

[0058] The small sector-shaped box covers 17 are arranged in groups in order to quickly open the small sector-shaped box covers 17 from different directions at the same time, and the sector-shaped area after grouping is halved accordingly, so that the effect of rapid opening and rapid closing into a complete disc can be achieved, which greatly improves the protection efficiency. The magnets are arranged to prevent the small sector-shaped box covers 17 from being opened and then quickly closed separately, which may cause a reaction force and bounce back and fail to close at one time. Under the attraction of the magnets, the phenomenon of rebound after collision can be effectively avoided, and at the same time, the two can be firmly closed to improve the protection effectiveness.

[0059] In some embodiments of the present invention, the motor 2 includes a stator winding 43 and a rotor 44 , and the speed regulator 8 is electrically connected to the tool detection device 4 , and the speed regulator 8 controls the rotation speed of the rotor 44 .

[0060] The speed regulator 8 automatically controls the speed of the motor 2 based on the potential safety hazard or fault information detected by the tool detection device 4, and correspondingly slows down the speed or stops the rotation of the motor 2, thereby achieving a safety warning and improving the automatic safety protection of the intelligent power tool.

[0061] In summary, the present invention has the advantages of being safe and reliable, intelligent and adjustable, and having a humanized automatic protection function in the field of electric tools, solving the problem of many potential safety hazards in electric tools in the prior art and providing strong safety protection for users.

[0062] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. An intelligent electric tool with a protective device, comprising a tool, a motor, a circuit control device, a tool detection device and an automatic protection device, wherein the circuit control device comprises a relay assembly, a control switch, a speed regulator and a reversing switch, wherein the speed regulator and the reversing switch are connected to the motor, wherein the motor is connected to the relay assembly, wherein the relay assembly is connected to the control switch, wherein the control switch comprises a metal contact sheet, a metal joint and a switch button, wherein the relay assembly does not contact the switch button in a power-on state, and contacts the switch button in a power-off state to control the control switch to be disconnected; The relay assembly includes a bracket, a first spring, an electromagnet, a coil, and an armature, wherein the electromagnet is fixed to the base of the bracket, a coil is wound around the outer periphery of the electromagnet from top to bottom, the armature is rotatably fixed to the upper end of the bracket, a first spring is provided between the armature and the base of the bracket and on a side away from the electromagnet, and a top block is provided above the armature and on a side close to the electromagnet, and the top block can control the movement of the switch button; A second spring is connected to one side of the metal contact piece, and the second spring is fixed to a fixed block inside the electric tool. The metal contact piece is separated from the metal joint under the action of the second spring, and the switch button is pressed to support the metal contact piece and contact the metal joint; the electric tool also includes a housing, a switch hole is provided on the housing, the switch button passes through the switch hole, the end of the switch button located inside the housing is a beveled end, and the top block contacts the inclined surface of the beveled end when it bounces up, and an annular safety buckle is provided at the end of the switch button located outside the housing of the electric tool; The tool detection device includes an optical fiber sensor, a speed sensor and a vibration sensor. The optical fiber sensor is attached to the tool surface along the annular circumference. A plurality of speed sensors are evenly distributed on the tool surface along the tool axis toward the outer edge of the tool. The vibration sensor is fixed near the tool axis. The automatic protection device comprises a large fan-shaped box cover and a small fan-shaped box cover, the large fan-shaped box cover and the small fan-shaped box cover are outwardly wrapped around the periphery of the tool, the centers of the large fan-shaped box cover and the small fan-shaped box cover coincide with the center of the rotating shaft of the tool, the large fan-shaped box cover is fixedly connected to the outside of the motor, the small fan-shaped box cover is rotatably nested in the large fan-shaped box cover, an electric limit lock is installed on the large fan-shaped box cover, the electric limit lock is clamped with one end of the small fan-shaped box cover, and the electric limit lock is electrically connected to the tool detection device; The ends of the large fan-shaped box cover are respectively provided with inner folding edges, and the ends of the small fan-shaped box cover are respectively provided with large outer folding edges and small outer folding edges. The large outer folding edge is engaged with the electric limit lock. During the rotation of the small fan-shaped box cover, the small outer folding edge does not contact the inner folding edge, and the large outer folding edge contacts the inner folding edge for limiting and fixing.

2. The intelligent electric tool according to claim 1, characterized in that: The housing is symmetrically provided with two semicircular grooves in the thickness direction, the middle section of the switch button is provided with a through hole, and limiting protrusions are respectively nested at the openings of the through holes. A third spring is connected between the limiting protrusions, and the limiting protrusions are clamped with the semicircular grooves.

3. The intelligent electric tool according to claim 1, characterized in that: Rotating seats are fixed on both sides of the middle section of the switch button, and swing rods are rotatably connected to the rotating seats respectively. A limiting plate is fixed to one end of the swing rod, and an ear plate is fixed to the limiting plate. The ear plate is hinged to the rotating seat, and a sliding groove is provided at the other end of the swing rod. A fixed shaft is passed through the sliding groove, and the fixed shaft is fixedly installed inside the casing. A fourth spring is sleeved on the swing rod between the limiting plate and the fixed shaft.

4. The intelligent electric tool according to claim 1, characterized in that: The fan-shaped angle of the large fan-shaped box cover is 180°-270°, and the fan-shaped angle of the small fan-shaped box cover is 60°-180°. When the small fan-shaped box cover is fully opened, it forms a 360° complete disc box cover with the large fan-shaped box cover.

5. The intelligent electric tool according to claim 1, characterized in that: The electric limit lock includes an electric telescopic rod, a fifth spring and a fixed plate. The electric telescopic rod is fixed on the box wall of the large fan-shaped box cover, and the fixed plate is fixed on the inner side of the box wall of the large fan-shaped box cover. The fifth spring is installed on the fixed plate. When the small fan-shaped box cover is clamped with the electric telescopic rod, the fifth spring contacts the large outer folded edge of the small fan-shaped box cover in a compressed state.

6. The intelligent electric tool according to claim 5, characterized in that: The small fan-shaped box cover and the electric limit lock are two groups in number and are symmetrically arranged. The small fan-shaped box cover pops up and opens from the left and right sides respectively, and magnets are respectively arranged at the ends of the small outer folded edges of the small fan-shaped box cover.

7. The intelligent electric tool according to claim 1 or 6, characterized in that: The motor comprises a stator winding and a rotor. The speed regulator is electrically connected to the tool detection device, and the speed regulator controls the rotation speed of the rotor.

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