Electric power tool with a safety function

Abstract

The utility model provides a kind of electric tool of protective function belongs to the technical field of portable grinding or polishing machinery, including power supply seat, the top fixed mounting of power supply seat has shell.The utility model is formed by the sensing line of handle inner wall place and forms hand-off detection effect, ensure that operator can cut off power supply in instant, prevent abrasive disc out of control to hurt, built-in gyroscope real-time perception tool attitude change, immediately trigger motor emergency brake when detecting falling action, avoid abrasive disc fragmentation or cause secondary disaster, control panel realizes the management of protective function, so that system can adjust response strategy according to operating environment, fundamentally eliminate the security risk of traditional angle grinder under hand-off and falling working condition, improve the intrinsic safety level of tool, and through the synergistic effect of buckle type dust cover and centrifugal chip removal groove, realize the dynamic sealing and automatic chip removal of gear box under non-stop condition, greatly prolong the service life of transmission component.

Description

Technical Field

[0001] This utility model belongs to the technical field of portable grinding or polishing machinery, and specifically relates to a power tool with protective function. Background Technology

[0002] An angle grinder is a handheld electric or pneumatic tool whose core structure consists of a high-speed rotating motor driving a spindle, which in turn drives a replaceable grinding / cutting disc at the front end via gears or direct drive. A typical design includes a handle, protective cover, spindle lock, and cooling system, and it is compatible with various consumables such as diamond saw blades and grinding wheels.

[0003] Currently, when angle grinders are released during operation, the high-speed rotating grinding discs may bounce uncontrollably, potentially causing cuts or injuries from flying debris to the operator or those nearby. If the motor is not de-energized in time during a fall, the grinding discs may shatter and fly away, the machine body may collide with flammable materials and cause a fire, or continuous idling may damage the transmission components. Furthermore, the dustproof sealing structure of the gearbox has design flaws, allowing dust and metal shavings to easily penetrate after long-term use, leading to abnormal wear of the gears and causing irreversible damage to internal parts, thus affecting the service life. Utility Model Content

[0004] The purpose of this utility model is to provide a power tool with protective functions, aiming to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A power tool with protective function includes a power base, a housing fixedly mounted on the top of the power base, an indicator light fixedly mounted on the outer side of the housing, a body fixedly mounted on the top of the housing, and an on / off switch provided on the outer side of the body.

[0006] As a preferred embodiment of this utility model, a control panel is fixedly installed on the outer side of the housing, and a sensor wire is fixedly installed in the inner cavity of the housing.

[0007] In a preferred embodiment of this utility model, a gyroscope is fixedly installed in the inner cavity of the housing, and a handle is fixedly installed on the top of the housing.

[0008] In a preferred embodiment of this utility model, the top of the handle is fixedly connected to the bottom of the body, and a main shaft gearbox is fixedly installed on the top of the body.

[0009] In a preferred embodiment of this utility model, a motor is fixedly installed on the top of the main shaft gearbox, and a grinding disc is fixedly installed on the output end of the motor.

[0010] As a preferred embodiment of this utility model, a charging port is provided on one side of the power socket, and a heat dissipation port is provided on the other side of the power socket.

[0011] As a preferred embodiment of this utility model, a slot is provided on the outer side of the main shaft gearbox, a card plate is movably mounted in the inner cavity of the slot, a nylon dust cover is movably mounted on the top of the card plate, a handle is fixedly installed on the outer side of the card plate, a serrated chip removal channel is provided in the inner cavity of the main shaft gearbox and at the top of the nylon dust cover, and a chip outlet is provided in the inner cavity of the main shaft gearbox, the chip outlet being interconnected with the serrated chip removal channel.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: the sensor lines set on the inner wall of the handle form a hand-off detection effect, ensuring that the power can be cut off the moment the operator releases their hand, preventing the grinding disc from going out of control and injuring people. The built-in gyroscope senses changes in the tool's posture in real time, and immediately triggers the motor's emergency braking when a fall is detected, avoiding the grinding disc from breaking or causing secondary disasters. The control panel realizes the management of protective functions, enabling the system to adjust its response strategy according to the working environment, fundamentally eliminating the safety hazards of traditional angle grinders in the case of hand-off and fall conditions, improving the inherent safety level of the tool. Furthermore, through the synergistic effect of the snap-on dust cover and the centrifugal chip removal trough, dynamic sealing and automatic chip removal of the gearbox are achieved without stopping the machine, greatly extending the life of the transmission components. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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. Among them: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective; Figure 3 This is a partial cross-sectional view of the overall structure of this utility model; Figure 4 This is a side view of the overall structure of this utility model; Figure 5 This is a schematic diagram showing the removal of the nylon dust cover structure of this utility model; Figure 6 This is a partial sectional view of the main shaft gearbox structure of this utility model.

[0014] In the diagram: 1. Power socket; 2. Housing; 3. Indicator light; 4. Body; 5. Power switch; 6. Control panel; 7. Sensor wire; 8. Gyroscope; 9. Handle; 10. Spindle gearbox; 11. Motor; 12. Grinding disc; 13. Charging port; 14. Heat dissipation vent; 15. Slot; 16. Card plate; 17. Nylon dust cover; 18. Handle; 19. Serrated chip removal channel; 20. Chip outlet. Detailed Implementation

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0018] Example Reference Figures 1-6 This is an embodiment of the present utility model, which provides a power tool with protective function, including a power base 1, a housing 2 fixedly installed on the top of the power base 1, an indicator light 3 fixedly installed on the outside of the housing 2, a body 4 fixedly installed on the top of the housing 2, and an on / off switch 5 provided on the outside of the body 4.

[0019] The device incorporates a sensor wire 7 inside the handle 9 to create an induced electric field. When the operator grips the handle, the human body changes the capacitance value of the electric field. The microcontroller detects this in real time and compares it with a preset threshold, completing the grip state determination within milliseconds. This technology forms an electrical interlock mechanism, where the main switch can only trigger the motor 11 to start when a valid grip signal is continuously detected. The power is immediately cut off the moment the hand leaves the handle, resulting in a response speed far exceeding that of traditional mechanical switches. Furthermore, the sensor wire 7 is completely embedded inside the plastic handle 9, avoiding physical wear and maintaining the integrity of the appearance, effectively solving the problem of inertial injury after the tool is released from the hand.

[0020] Specifically, a control panel 6 is fixedly installed on the outside of the housing 2, a sensor wire 7 is fixedly installed in the inner cavity of the housing 2, a gyroscope 8 is fixedly installed in the inner cavity of the housing 2, and a handle 9 is fixedly installed on the top of the housing 2.

[0021] The addition of control panel 6 allows users to intuitively configure the parameters or modes of the protection function, such as adjusting the sensitivity threshold of the off-hand protection or viewing real-time safety status feedback. The sensor line 7 is built into the cavity of housing 2. By forming an induced electric field, the main switch can only trigger motor 11 to start when a valid grip signal is continuously detected. The power is cut off immediately when the hand is released, improving the reliability of the protection function and making it suitable for avoiding misjudgments under high vibration conditions. The introduction of gyroscope 8 gives the tool dynamic posture perception capabilities and can monitor the spatial displacement and acceleration changes of the tool in real time. When an abnormal fall trajectory is detected, the motor 11 is braked urgently through electrical signal linkage to avoid secondary damage caused by the free rotation of grinding disc 12. The topology connection design of handle 9 not only optimizes the force transmission path to reduce operator fatigue, but also provides a rigid mounting carrier for gyroscope 8 to ensure the accuracy of motion data acquisition.

[0022] Furthermore, the top of the handle 9 is fixedly connected to the bottom of the body 4, the top of the body 4 is fixedly mounted with a spindle gearbox 10, the top of the spindle gearbox 10 is fixedly mounted with a motor 11, and the output end of the motor 11 is fixedly mounted with a grinding disc 12.

[0023] The axial fixed connection between the handle 9 and the body 4 forms a mechanical closed-loop structure, reducing the relative displacement between components when subjected to cutting reaction force, thereby protecting the stability of the internal sensor circuitry. The top-mounted layout of the spindle gearbox 10 shortens the power transmission chain from the motor 11 to the grinding disc 12, achieving rapid response to drop protection while reducing energy delay caused by gear transmission losses. The direct-drive connection between the motor 11 and the spindle gearbox 10 ensures instantaneous torque output, allowing power cut-off in milliseconds when the protection function is triggered. The modular mounting interface of the grinding disc 12 allows compatibility with various operating consumables, and the intervention of the protection function does not affect its quick replacement characteristics.

[0024] Preferably, a charging port 13 is provided on one side of the power socket 1, and a heat dissipation port 14 is provided on the other side of the power socket 1.

[0025] The opposite layout of the charging port 13 and the heat dissipation port 14 achieves physical isolation between power management and thermal management, preventing high-temperature airflow from affecting battery life during charging. The directional opening structure of the heat dissipation port 14, together with the internal air duct of the housing 2, forms an active heat dissipation circulation system. The sensor line 7 and the gyroscope 8 are not affected by temperature rise during continuous operation, maintaining the long-term stability of the protection function.

[0026] Furthermore, a slot 15 is provided on the outer side of the main spindle gearbox 10, a retaining plate 16 is movably secured in the inner cavity of the slot 15, a nylon dust cover 17 is movably secured on the top of the retaining plate 16, a handle 18 is fixedly installed on the outer side of the retaining plate 16, a serrated chip removal channel 19 is provided in the inner cavity of the main spindle gearbox 10 and at the top of the nylon dust cover 17, and a chip outlet 20 is provided in the inner cavity of the main spindle gearbox 10, the chip outlet 20 and the serrated chip removal channel 19 are interconnected.

[0027] The sliding fit design of the slot 15 and the plate 16 enables the quick installation and removal of the nylon dust cover 17. The serrated chip discharge channel 19 uses the principle of centrifugal force to guide the intruding debris along a specific trajectory to the chip outlet 20, forming an active sewage discharge channel, which effectively prevents the accumulation of impurities. It adds a dynamic chip discharge function on the basis of traditional static sealing, and greatly reduces the wear risk of internal parts of the spindle gearbox 10 through a mechanical self-cleaning mechanism.

[0028] When in use, when the user holds the handle 9, the sensor line 7 generates an induced electric field. The main switch can only trigger the motor 11 to start when a valid grip signal is continuously detected. The power is immediately cut off the moment the hand is released. The motor 11 is activated by the control panel 6 to drive the spindle gearbox 10 to rotate the grinding disc 12. When the spindle gearbox 10 is rotating, the nylon dust cover 17 prevents large particles of foreign objects from entering. At the same time, the centrifugal force of rotation causes the debris to be automatically discharged through the chip outlet 20 along the sawtooth chip discharge channel 19, achieving dynamic dust prevention and self-cleaning. During operation, the gyroscope 8 continuously monitors the spatial attitude of the tool. If abnormal acceleration or angle change is detected, a braking signal is immediately sent to the motor 11 to achieve emergency stop. At the same time, when the gyroscope 8 detects the release state, the control circuit automatically cuts off the power, achieving double protection. Throughout the entire process, the power base 1 maintains a stable system temperature through the heat dissipation vent 14. All functional modules maintain coordinated operation through the structural integration of the housing 2, ensuring the real-time and reliable response of the protection function.

[0029] In summary, the sensor line 7 located on the inner wall of the handle 9 creates a hand-off detection effect, ensuring that the power can be cut off the moment the operator releases their hand, preventing the grinding disc 12 from going out of control and causing injury. The dynamic monitoring of the gyroscope 8 and the rapid response characteristics of the motor 11 combine to construct a three-dimensional drop protection system. The separate design of the heat dissipation vent 14 and the charging port 13 of the power base 1 ensures the reliability of the system's continuous operation. Without affecting the basic performance of the tool, it effectively solves the problem of high-speed rotating tools going out of control and the danger of falling, reducing the risk of mechanical injury during construction operations.

[0030] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0031] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0032] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A power tool with protective function, characterized in that: Includes a power socket (1), a housing (2) is fixedly installed on the top of the power socket (1), an indicator light (3) is fixedly installed on the outside of the housing (2), a body (4) is fixedly installed on the top of the housing (2), and a power switch (5) is provided on the outside of the body (4).

2. The power tool with protective function according to claim 1, characterized in that: A control panel (6) is fixedly installed on the outside of the housing (2), and a sensor wire (7) is fixedly installed in the inner cavity of the housing (2).

3. The power tool with protective function according to claim 2, characterized in that: A gyroscope (8) is fixedly installed in the inner cavity of the housing (2), and a handle (9) is fixedly installed on the top of the housing (2).

4. A power tool with protective function according to claim 3, characterized in that: The top of the handle (9) is fixedly connected to the bottom of the body (4), and the top of the body (4) is fixedly mounted with a spindle gearbox (10).

5. A power tool with protective function according to claim 4, characterized in that: A motor (11) is fixedly installed on the top of the main shaft gearbox (10), and a grinding disc (12) is fixedly installed at the output end of the motor (11).

6. A power tool with protective function according to claim 5, characterized in that: The power socket (1) has a charging port (13) on one side and a heat dissipation port (14) on the other side.

7. A power tool with protective function according to claim 6, characterized in that: The main shaft gearbox (10) has a slot (15) on its outer side. A card plate (16) is movably attached to the inner cavity of the slot (15). A nylon dust cover (17) is movably attached to the top of the card plate (16). A handle (18) is fixedly installed on the outer side of the card plate (16). A sawtooth chip removal channel (19) is provided in the inner cavity of the main shaft gearbox (10) and at the top of the nylon dust cover (17). A chip outlet (20) is provided in the inner cavity of the main shaft gearbox (10). The chip outlet (20) is connected to the sawtooth chip removal channel (19).

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