Electric tool hand release protection method and system and electric tool

Abstract

The invention provides an electric tool release protection method and system and an electric tool, and relates to the technical field of electric tools, the method is applied to the electric tool, and an induction coil is arranged in a shell of a holding position of the electric tool; the method comprises the following steps: when a motor of the electric tool runs, acquiring a capacitance value of a holding position in real time through an induction coil; according to the capacitance value, using actions of a user of the electric tool are obtained, and the using actions comprise hand releasing actions; and when the user releases the hand, the motor is controlled to rotate reversely until the motor stops running. According to the invention, not only is the sensitivity of hand release protection improved, but also a braking measure can be rapidly taken at the moment of hand release, the safety of the electric tool in the use process is greatly enhanced, and reliable protection is provided for a user.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and in particular, to a method and system for protecting a power tool from being dropped and a power tool. Background Art

[0002] During the use of hand-held power tools, due to their high-speed rotation characteristics, once dropped, they may cause serious injuries to surrounding personnel. Therefore, in order to ensure the safe use of power tools, it is necessary to add a function of protecting the power tool from being dropped.

[0003] In the related art, a mechanical switch is usually installed at a fixed position of a hand-held power tool, and whether the power tool is dropped is judged by the opening and closing of the mechanical switch. This method has a complex installation structure. At the same time, there are certain requirements for the holding position of the user, and the user needs to hold it at a fixed position. Therefore, the flexibility is poor, and it is easily affected by common working environments of power tools such as dust and moisture, resulting in a decrease in the induction sensitivity, and thus a decrease in the detection accuracy of the dropping action, causing safety accidents. Summary of the Invention

[0004] The problem solved by the present invention is how to improve the reliability of the function of protecting a power tool from being dropped.

[0005] To solve the above problems, the present invention provides a method and system for protecting a power tool from being dropped and a power tool.

[0006] In a first aspect, a method for protecting a power tool from being dropped according to the present invention is applied to a power tool, and an induction coil is provided inside the housing at the holding position of the power tool; the method includes:

[0007] When the motor of the power tool is running, the capacitance value at the holding position is obtained in real time through the induction coil;

[0008] According to the capacitance value, the use action of the user of the power tool is judged, wherein the use action includes a dropping action;

[0009] When the user has the dropping action, the motor is controlled to reverse until the motor stops running.

[0010] Optionally, the use action further includes a holding action, and the method further includes:

[0011] When the motor of the power tool receives a start signal, the capacitance value at the holding position is obtained through the induction coil;

[0012] According to the capacitance value, it is judged whether the use action of the user is the holding action;

[0013] If yes, the motor is controlled to start, and if no, the motor is kept stopped.

[0014] Optionally, judging the use action of the user of the power tool according to the capacitance value includes:

[0015] Set preset safety thresholds;

[0016] Determining the use action of the user according to the magnitude relationship between the capacitance value and the preset safety threshold;

[0017] Wherein, when the capacitance value is less than the preset safety threshold, the use action of the user is determined to be the hands-off action;

[0018] When the capacitance value is greater than or equal to the preset safety threshold, the use action of the user is determined to be the holding action.

[0019] Optionally, the holding position of the electric tool is further provided with a temperature sensor; the setting of the preset safety threshold comprises:

[0020] Acquiring the surface temperature of the holding position by means of the temperature sensor;

[0021] determining a usage mode of the user according to the surface temperature;

[0022] The preset safety threshold is set according to the usage mode.

[0023] Optionally, judging the usage mode of the user according to the surface temperature includes:

[0024] When the surface temperature is greater than or equal to a first temperature threshold, determining that the usage mode is a manual control mode;

[0025] When the surface temperature is less than or equal to a second temperature threshold, determining that the usage mode is a glove mode;

[0026] The first temperature threshold is greater than the second temperature threshold.

[0027] Optionally, setting the preset safety threshold according to the usage mode includes:

[0028] When the usage mode is the manual control mode, setting the preset safety threshold to a first preset capacitance threshold;

[0029] When the usage mode is the glove mode, setting the preset safety threshold to a second preset capacitance threshold;

[0030] Wherein, the first preset capacitance threshold and the second preset capacitance threshold are both pre-calibrated thresholds corresponding to different usage modes.

[0031] Optionally, the determining the usage action of the user of the power tool according to the capacitance value includes:

[0032] Obtaining a change curve of the capacitance value within a preset time period;

[0033] Obtaining a change rate of the capacitance value through the change curve;

[0034] When the capacitance value decreases and the change rate of the capacitance value is greater than or equal to a preset change rate, it is determined that the usage action of the user is the dropping action.

[0035] Optionally, the determining the usage action of the user of the power tool according to the capacitance value further includes:

[0036] When the capacitance value decreases and the change rate of the capacitance value is always less than the preset change rate until the capacitance value is less than a preset safety threshold, it is determined that the usage action of the user is the dropping action.

[0037] In a second aspect, the present invention provides a power tool dropping protection system, which is applied to a power tool. An induction coil is arranged inside the shell of the power tool at the holding position. The power tool dropping protection system includes:

[0038] A monitoring unit, configured to, when the motor of the power tool is running, obtain the capacitance value of the holding position in real time through the induction coil;

[0039] A judgment unit, configured to judge the usage action of the user of the power tool according to the capacitance value, wherein the usage action includes a dropping action;

[0040] A control unit, configured to, when the user has the dropping action, control the motor to reverse until the motor stops running.

[0041] In a third aspect, the present invention provides a power tool, including a memory and a processor;

[0042] The memory is used for storing a computer program;

[0043] The processor is configured to, when executing the computer program, implement the above-mentioned power tool dropping protection method.

[0044] The electric tool release protection method, system and electric tool of the present invention can effectively resist dust and moisture by arranging induction coils inside the housing at the holding position of the electric tool. Exemplarily, by forming induction coils with one or more insulated wires and installing them on the inner wall card slots of the machine housing, the reliability of the release protection function is effectively improved. The induction coils are simply installed and have a large coverage area, with a higher tolerance for the user's hand-held position. When the motor of the electric tool is running, the induction coils can continuously obtain changes in capacitance values, and the change in capacitance value is closely related to whether the user's hand holds the tool. Once the user makes a release action, the capacitance value will change significantly, and the system can quickly detect this change and determine that the user has released the tool accordingly. At this time, the system immediately controls the motor to reverse, and this reverse operation can quickly consume the kinetic energy of the tool and stop its operation within a short time, thus effectively avoiding potential injuries caused by the tool flying out of control or continuing to rotate due to release to the user or surrounding personnel. Through this real-time monitoring and rapid response mechanism based on capacitance value changes, the present invention not only improves the sensitivity of release protection but also ensures that braking measures can be quickly taken at the moment of release, greatly enhancing the safety of the electric tool during use and providing reliable protection for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic flowchart of the electric tool release protection method in an embodiment of the present invention;

[0046] Figure 2 It is a schematic structural diagram of the electric tool release protection system in another embodiment of the present invention;

[0047] Figure 3 It is a schematic structural diagram of the electric tool in another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0049] It should be understood that the various steps recorded in the method embodiments of the present invention can be executed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this regard.

[0050] As used herein, the term "comprising" and its variations are open-ended, i.e., "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0051] It should be noted that the modification of "one" and "a plurality of" mentioned in the present invention is illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0052] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0053] Combined with Figure 1 As shown, the present invention provides a method for protecting an electric tool from being released from the hand. The method is applied to an electric tool, and an induction coil is provided in the housing of the electric tool at the holding position.

[0054] Specifically, an induction coil is provided in the housing of the electric tool at the holding position. In a preferred embodiment of the present invention, an induction chip is installed inside the electric tool driver. By installing one or more insulated wires on the inner wall slot of the housing, the wires are used as the induction coil; the induction coil is connected to the induction chip. The wires themselves have good insulation. The wires are installed inside the housing through the slots, which can effectively resist dust and moisture. The wire charging induction coil can be flexibly designed at the hand-held position of the housing, with flexible design and sensitive and reliable induction signals. The induction chip is installed inside the driver, and the driver is protected by an injection molding process, which has anti-vibration, waterproof and dustproof properties, and the production process is simple and the cost is controllable.

[0055] The method includes:

[0056] When the motor of the electric tool runs, the capacitance value of the holding position is obtained in real time through the induction coil.

[0057] Specifically, an induction coil is provided at the holding position of the power tool. The induction coil can monitor the change in capacitance value at the holding position in real time. When the user holds the power tool by hand, a certain capacitance effect will be generated between the human body and the induction coil, and the induction coil will detect a stable capacitance value. Once the user's hand leaves the tool, the capacitance value will drop rapidly. By monitoring the change in capacitance value in real time, the system can quickly determine whether the user is still holding the tool. Compared with the traditional mechanical or simple induction chip method, this method has higher sensitivity and real-time performance, ensuring that the hand-held state can still be accurately detected in a complex working environment, thus providing reliable basic data support for subsequent release protection measures.

[0058] Based on the capacitance value, determine the usage action of the user of the power tool, where the usage action includes a release action.

[0059] Specifically, through the change in capacitance value obtained by the induction coil, the usage action of the user can be further analyzed; when the capacitance value remains within a stable range, it indicates that the user is normally holding the tool and operating; when the capacitance value suddenly drops to a lower threshold, it can be determined as a release action. The usage action analysis method based on the change in capacitance value in this embodiment can accurately distinguish between the two states of normal holding and release. The system can quickly analyze and judge the change in capacitance value, avoiding misjudgment caused by misoperation or environmental interference. For example, during the normal operation of the tool, even if the user's hand moves slightly or touches other objects, as long as the capacitance value does not drop significantly, the system will not misjudge it as a release action. The precise action analysis ability of this embodiment ensures the reliability and effectiveness of the release protection function. The protection measure will only be triggered when a real release occurs, thus avoiding unnecessary braking and shutdown and improving the usage efficiency and safety of the tool.

[0060] When the user has the release action, control the motor to reverse until the motor stops running.

[0061] Specifically, after detecting the hands-off action, the system quickly takes braking measures and controls the motor to reverse. The reversing operation of this embodiment can quickly consume the kinetic energy of the power tool, causing it to stop running in a short time. Moreover, compared with the traditional direct power-off braking method, reverse braking has a faster response speed and higher braking efficiency. For example, when the tool is out of hand, due to inertia, the tool may continue to rotate at a high speed. Direct power-off may not be able to stop the movement of the tool immediately, while reverse braking can use reverse torque to quickly offset the rotational kinetic energy of the tool, thereby achieving rapid shutdown. This reverse braking method can effectively prevent the tool from flying out of control or continuing to rotate after being out of hand, causing harm to personnel. This embodiment ensures that the tool can be stopped quickly and reliably at the moment of being out of hand by precisely controlling the reversing process of the motor, thereby providing maximum safety protection for the user and surrounding personnel.

[0062] In summary, combined with Figure 3 The electric tool shown in the figure has an induction coil built into the hand-grip position for real-time monitoring of the capacitance change between the human body and the tool, thereby sensing the user's grip state. The induction coil is connected to the induction chip, which is installed inside the motor driver and is responsible for processing the signal from the induction coil. When the user holds the tool tightly, the induction chip detects a stable capacitance value and sends a running signal to the motor through the motor drive circuit. Once the induction chip detects a drop in capacitance, indicating that the user may let go, the motor will be quickly controlled to reverse through the motor drive circuit until it stops running to prevent the high-speed rotating tool from causing harm. In addition, the electric tool is also provided with an AC input port for connecting a power source, and a motor line for transmitting power from the motor driver to the motor to ensure the normal operation of the tool. The entire structural design of the electric tool in the embodiment of the present invention focuses on protection performance. The induction coil uses an insulated wire and is installed in a slot on the inner wall of the casing, which can effectively resist dust and moisture; the induction chip is installed inside the driver, and the driver is protected by a glue injection process, which has the characteristics of vibration prevention, waterproofness, and dust prevention, and the production process is simple and the cost is controllable.

[0063] The electric tool release protection method of the present invention sets an induction coil inside the housing at the holding position of the electric tool. Exemplarily, by forming an induction coil with one or more insulated wires and installing it on the inner wall card slot of the housing, it can effectively resist dust and moisture. And it continuously monitors the capacitance value at the holding position, thereby effectively improving the reliability of the release protection function. The induction coil is simply installed and has a large coverage area, with a higher tolerance for the user's hand-held position. When the motor of the electric tool runs, the induction coil can continuously obtain the change of the capacitance value, and the change of the capacitance value is closely related to whether the user's hand holds the tool. Once the user makes a release action, the capacitance value will change significantly, and the system can quickly detect this change and determine that the user has released the tool accordingly. At this time, the system immediately controls the motor to reverse, and this reverse operation can quickly consume the kinetic energy of the tool and stop its operation in a short time, thus effectively avoiding the potential harm caused by the out-of-control flying or continuous rotation of the tool due to release to the user or surrounding personnel. Through this real-time monitoring and rapid response mechanism based on the change of capacitance value, the present invention not only improves the sensitivity of release protection, but also ensures that braking measures can be quickly taken at the moment of release, greatly enhancing the safety of the electric tool during use and providing reliable protection for the user.

[0064] Optionally, the usage action further includes a holding action, and the method further includes:

[0065] When the motor of the electric tool receives a start signal, obtain the capacitance value of the holding position through the induction coil;

[0066] According to the capacitance value, determine whether the usage action of the user is the holding action;

[0067] If so, control the motor to start, if not, keep the motor stopped.

[0068] Specifically, when the motor of the power tool receives a start signal, it obtains the capacitance value of the holding position through the induction coil to determine whether the user is performing a holding action. This process is an important part of the accidental release protection function, ensuring that the tool will only start when the user is holding it correctly. Specifically, when the user presses the start button, the system first detects the capacitance value of the holding position through the induction coil. If the capacitance value is within the preset holding range, it indicates that the user is holding the tool correctly, and the system allows the motor to start; conversely, if the capacitance value is below the holding threshold, it indicates that the user is not holding the tool correctly, and the system will keep the motor in a stopped state. This mechanism effectively avoids accidental starts caused by misoperation or incorrect holding, thus improving the safety of the power tool. This capacitance-based holding detection method can effectively resist interference from dust and moisture, ensuring that the user's holding state can still be accurately judged in a complex working environment. For example, in environments such as construction sites or machining workshops, the tool may come into contact with a large amount of dust or moisture, and traditional mechanical detection methods may fail due to these factors. However, the capacitance detection method in the present invention can effectively avoid such problems through insulated wires and protective designs, ensuring the safe start of the tool.

[0069] In this optional embodiment, by detecting the holding action at the start stage, it is ensured that the tool will only start when the user is holding it correctly, effectively avoiding accidental starts caused by misoperation or incorrect holding, thereby reducing potential safety risks. Secondly, this capacitance-based holding detection method has high sensitivity and anti-interference ability and can operate stably in a complex working environment.

[0070] Optionally, judging the usage action of the user of the power tool according to the capacitance value includes:

[0071] Set a preset safety threshold;

[0072] Judge the usage action of the user according to the magnitude relationship between the capacitance value and the preset safety threshold;

[0073] Wherein, when the capacitance value is less than the preset safety threshold, it is determined that the usage action of the user is the accidental release action;

[0074] When the capacitance value is greater than or equal to the preset safety threshold, it is determined that the usage action of the user is the holding action.

[0075] Specifically, by setting a preset safety threshold and judging the user's usage action based on the relationship between the capacitance value and this threshold, accurate recognition of the releasing and holding actions can be achieved. Specifically speaking, the preset safety threshold is set based on the typical capacitance value range between the human body and the induction coil. When the user holds the power tool by hand, a stable capacitance value will be generated between the human body and the induction coil, which is usually greater than or equal to the preset safety threshold. When the user releases the hand, the capacitance value will drop rapidly and be lower than the preset safety threshold. In this way, the system can quickly and accurately judge whether the user is still holding the tool.

[0076] In a preferred embodiment of the present invention, an induction coil is installed at the holding position of the power tool. When the user holds the tool by hand, the capacitance value detected by the induction coil will remain at a relatively high level. Once the user releases the hand, the capacitance value will drop significantly. By comparing the capacitance value with the preset safety threshold, the system can quickly judge the releasing action and take corresponding braking measures. The judgment method based on the change of capacitance value in this embodiment not only has high sensitivity, but also can effectively avoid misjudgment caused by environmental interference or misoperation, ensuring the reliability and accuracy of the releasing protection function.

[0077] In this alternative embodiment, by setting a preset safety threshold, the system can quickly and accurately judge the holding state of the user, avoiding misjudgment caused by small fluctuations in the capacitance value. This threshold-based judgment method not only improves the response speed of the system, but also enhances its stability in complex environments. For example, in a working environment with many interference factors such as dust and water vapor, traditional induction methods may fail due to signal interference. However, through the comparison of the preset safety threshold and the capacitance value in the present invention, these interferences can be effectively filtered out to ensure that the system is always in a reliable operating state.

[0078] Optionally, a temperature sensor is further provided at the holding position of the power tool; the setting of the preset safety threshold includes:

[0079] Obtaining the surface temperature of the holding position through the temperature sensor;

[0080] Judging the usage mode of the user according to the surface temperature;

[0081] Setting the preset safety threshold according to the usage mode.

[0082] Specifically, the present invention optimizes the setting process of the preset safety threshold by arranging a temperature sensor at the holding position of the power tool. Specifically, the temperature sensor can obtain the surface temperature of the holding position in real time, and the change of the surface temperature is often closely related to the user's usage pattern. For example, when the power tool is used continuously for a long time, the temperature of the holding position may rise; while during intermittent use or just starting up, the temperature is relatively low. By analyzing the surface temperature, the system can determine whether the user is in a long-term continuous working mode or an intermittent working mode. According to different usage patterns, the system can dynamically adjust the preset safety threshold. For example, in the high-temperature mode, since the change range of the capacitance value may be different from that in the low-temperature mode due to the user's sweating, the system can appropriately adjust the safety threshold to adapt to this change.

[0083] In a preferred embodiment of the present invention, an induction coil and a temperature sensor can be installed at the holding position of the power tool. When the user holds the tool by hand, the temperature sensor will detect the temperature change of the holding position. If the temperature is high, the system determines it as a long-term continuous working mode and adjusts the preset safety threshold according to this mode to ensure that the holding state of the user can be accurately judged in different usage scenarios. This method of dynamically adjusting the threshold based on temperature not only improves the adaptability and reliability of the system but also further enhances the accuracy of the release protection function.

[0084] In this alternative embodiment, by combining the surface temperature information obtained by the temperature sensor, the system can dynamically adjust the preset safety threshold according to different usage patterns, thereby better coping with various complex usage scenarios. By dynamically adjusting the threshold, this situation can be effectively avoided, ensuring that the system is always in the best operating state.

[0085] Optionally, judging the user's usage pattern according to the surface temperature includes:

[0086] When the surface temperature is greater than or equal to the first temperature threshold, it is determined that the usage pattern is the manual control mode;

[0087] When the surface temperature is less than or equal to the second temperature threshold, it is determined that the usage pattern is the glove mode;

[0088] Wherein, the first temperature threshold is greater than the second temperature threshold.

[0089] Specifically, by setting two temperature thresholds to determine the user's usage pattern, the safety threshold of the power tool can be accurately adjusted. Specifically, when the surface temperature at the holding position is greater than or equal to the first temperature threshold, the system determines that the usage pattern is the hand-held mode, which usually means that the user directly holds the tool with their hand. At this time, the contact between the human body and the tool is relatively close, and the change range of the capacitance value is relatively stable. When the surface temperature is less than or equal to the second temperature threshold, the system determines that the usage pattern is the glove mode, which usually means that the user operates the tool while wearing gloves. The insulation of the gloves may cause the change range of the capacitance value to be different from that in the hand-held mode. Through this temperature-based usage pattern determination method, the system can dynamically adjust the preset safety threshold according to different modes to adapt to the capacitance value changes under different operating conditions.

[0090] In a preferred embodiment of the present invention, for example, an induction coil and a temperature sensor are installed at the holding position of the power tool. When the user operates while wearing gloves, due to the heat insulation effect of the gloves, the surface temperature at the holding position may be relatively low. After the system detects this temperature change through the temperature sensor, it determines the glove mode and adjusts the safety threshold accordingly. This dynamic adjustment mechanism can effectively avoid misjudgment caused by different usage patterns and ensure that the release protection function can operate reliably under various operating conditions.

[0091] In this alternative embodiment, by setting two temperature thresholds to determine the usage pattern, the system can dynamically adjust the preset safety threshold according to different operating conditions, so as to better cope with various complex usage scenarios.

[0092] Optionally, setting the preset safety threshold according to the usage pattern includes:

[0093] When the usage pattern is the hand-held mode, set the preset safety threshold to the first preset capacitance threshold;

[0094] When the usage pattern is the glove mode, set the preset safety threshold to the second preset capacitance threshold;

[0095] Wherein, both the first preset capacitance threshold and the second preset capacitance threshold are pre-calibrated thresholds corresponding to different usage patterns respectively.

[0096] Specifically, the present invention further optimizes the release protection function of the power tool by setting different preset safety thresholds according to different usage modes. Specifically, when the usage mode is the manual control mode, the preset safety threshold is set to the first preset capacitance threshold; when the usage mode is the glove mode, the preset safety threshold is set to the second preset capacitance threshold. Since the human body directly contacts the tool in the manual control mode, the capacitance value is usually relatively high and the variation range is small, so the first preset capacitance threshold is set to a relatively high value. In the glove mode, due to the insulating effect of the glove, the capacitance value is usually relatively low and the variation range is large, so the second preset capacitance threshold is set to a relatively low value. This method of dynamically adjusting the preset safety threshold according to the usage mode can ensure that the system can accurately judge the user's holding state under different operating conditions.

[0097] In this optional embodiment, by setting different preset safety thresholds according to the usage mode, the system can dynamically adjust the judgment criteria according to different operating conditions, so as to better cope with various complex usage scenarios. The relatively high preset capacitance threshold can ensure that the system responds quickly to slight holding changes; in the glove mode, the relatively low preset capacitance threshold can avoid misjudgment caused by the insulating property of the glove. This method not only improves the intelligent level of the system, but also enhances the user's sense of security and trust in the power tool, enabling the tool to operate safely and efficiently in various application scenarios.

[0098] Optionally, judging the usage action of the user of the power tool according to the capacitance value includes:

[0099] Obtain the change curve of the capacitance value within a preset time period;

[0100] Obtain the change rate of the capacitance value through the change curve;

[0101] When the capacitance value decreases and at the same time the change rate of the capacitance value is greater than or equal to the preset change rate, it is determined that the usage action of the user is the release action.

[0102] Specifically, the present invention accurately determines the user's operation actions, especially the action of releasing the hand, by analyzing the change curve of the capacitance value within a preset time period and its change rate. Specifically, first, the change curve of the capacitance value within the preset time period is obtained, and this curve can reflect the change of the capacitance value over time. Then, by calculating the slope or derivative of this curve, the change rate of the capacitance value is obtained. When the capacitance value decreases and its change rate is greater than or equal to the preset change rate, the system determines that the user has performed the action of releasing the hand. The key to this method is to not only focus on the absolute value change of the capacitance value but also on the change rate, so as to effectively distinguish the slight fluctuations during normal operation from the rapid changes during hand release. For example, an induction coil is installed at the holding position of the power tool. When the user holds the tool by hand, the capacitance value remains stable; while when the user releases the hand, the capacitance value will rapidly decrease. By analyzing the change rate during the decrease process, the system can quickly and accurately determine the action of releasing the hand. This judgment method based on the change rate can effectively avoid misjudgment caused by environmental interference or slight holding changes during the user's normal operation, ensuring the reliability and sensitivity of the hand-release protection function.

[0103] In this optional embodiment, by analyzing the change curve of the capacitance value and its change rate, the system can accurately distinguish the slight fluctuations during normal operation from the rapid changes during hand release, thereby effectively avoiding misjudgment. This method not only improves the response speed of the system, enabling it to quickly trigger protection measures at the moment of hand release, but also enhances the anti-interference ability of the system, enabling it to operate stably in a complex working environment.

[0104] Optionally, the determining of the user's operation actions of the power tool according to the capacitance value further includes:

[0105] When the capacitance value decreases and the change rate of the capacitance value is always less than the preset change rate until the capacitance value is less than the preset safety threshold, it is determined that the user's operation action is the action of releasing the hand.

[0106] Specifically, by combining the change rate of the capacitance value and the preset safety threshold for judgment, the system can effectively distinguish the slow changes during normal operation from the rapid changes during hand release, thereby avoiding misjudgment. Thus, it not only improves the response speed of the system, enabling it to quickly trigger protection measures at the moment of hand release, but also enhances the anti-interference ability of the system, enabling it to operate stably in a complex working environment.

[0107] Combined Figure 2 As shown, the present invention also provides a power tool hand-release protection system. The power tool hand-release protection system is applied to a power tool, and an induction coil is provided inside the housing of the power tool at the holding position; the power tool hand-release protection system includes:

[0108] A monitoring unit, configured to, when the motor of the power tool is running, obtain the capacitance value of the holding position in real time through the induction coil;

[0109] A judgment unit, configured to judge the usage action of the user of the power tool according to the capacitance value, wherein the usage action includes a dropping action;

[0110] A control unit, configured to, when the user has the dropping action, control the motor to reverse until the motor stops running.

[0111] The power tool dropping protection system of the present invention has the same advantages compared with the prior art as those of the above-mentioned power tool dropping protection method compared with the prior art, and will not be elaborated herein.

[0112] In a second aspect, the present invention provides a power tool dropping protection system, which is applied to a power tool. An induction coil is arranged in the shell of the power tool at the holding position; the power tool dropping protection system includes:

[0113] A monitoring unit, configured to, when the motor of the power tool is running, obtain the capacitance value of the holding position in real time through the induction coil;

[0114] A judgment unit, configured to judge the usage action of the user of the power tool according to the capacitance value, wherein the usage action includes a dropping action;

[0115] A control unit, configured to, when the user has the dropping action, control the motor to reverse until the motor stops running.

[0116] The present invention also provides a power tool, including a memory and a processor;

[0117] The memory is used for storing a computer program;

[0118] The processor is configured to, when executing the computer program, implement the above-mentioned power tool dropping protection method.

[0119] The power tool of the present invention has the same advantages compared with the prior art as those of the above-mentioned power tool dropping protection method compared with the prior art, and will not be elaborated herein.

[0120] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A method for protecting an electric tool from being dropped, characterized in that, The method is applied to a power tool, and an induction coil is arranged inside the housing of the power tool at the holding position; the method includes: When the motor of the power tool runs, the capacitance value at the holding position is obtained in real time through the induction coil; According to the capacitance value, the usage action of the user of the power tool is judged, wherein the usage action includes a dropping action; When the user has the dropping action, control the motor to reverse until the motor stops running.

2. The electric tool accidental release protection method according to claim 1, characterized in that, The usage action further includes a holding action, and the method further includes: When the motor of the power tool receives a start signal, the capacitance value at the holding position is obtained through the induction coil; According to the capacitance value, judge whether the usage action of the user is the holding action; If so, control the motor to start, if not, keep the motor stopped.

3. The electric tool release protection method according to claim 2, characterized in that Judging the usage action of the user of the power tool according to the capacitance value includes: Set a preset safety threshold; Judge the usage action of the user through the magnitude relationship between the capacitance value and the preset safety threshold; Wherein, when the capacitance value is less than the preset safety threshold, it is determined that the usage action of the user is the dropping action; When the capacitance value is greater than or equal to the preset safety threshold, it is determined that the usage action of the user is the holding action.

4. The electric tool release protection method according to claim 3, characterized in that A temperature sensor is further arranged at the holding position of the power tool; setting the preset safety threshold includes: Obtain the surface temperature at the holding position through the temperature sensor; Judge the usage mode of the user according to the surface temperature; Set the preset safety threshold according to the usage mode.

5. The electric tool release protection method according to claim 4, characterized in that, Judging the usage mode of the user according to the surface temperature includes: When the surface temperature is greater than or equal to a first temperature threshold, it is determined that the usage mode is a manual control mode; When the surface temperature is less than or equal to a second temperature threshold, it is determined that the usage mode is a glove mode; Wherein, the first temperature threshold is greater than the second temperature threshold.

6. The electric tool release protection method according to claim 5, wherein Setting the preset safety threshold according to the usage mode includes: When the usage mode is the manual control mode, set the preset safety threshold to a first preset capacitance threshold; When the usage mode is the glove mode, set the preset safety threshold to a second preset capacitance threshold; Wherein, both the first preset capacitance threshold and the second preset capacitance threshold are thresholds corresponding to different usage modes calibrated in advance.

7. The electric tool release protection method according to claim 2, characterized in that Judging the usage action of the user of the power tool according to the capacitance value includes: Obtain the change curve of the capacitance value within a preset time period; Obtain the change rate of the capacitance value through the change curve; When the capacitance value drops and at the same time the change rate of the capacitance value is greater than or equal to a preset change rate, it is determined that the usage action of the user is the dropping action.

8. The electric tool release protection method according to claim 7, characterized in that, Judging the usage action of the user of the power tool according to the capacitance value further includes: When the capacitance value decreases and the change rate of the capacitance value is always less than the preset change rate until the capacitance value is less than the preset safety threshold, it is determined that the user's usage action is the hand-off action.

9. An electric tool release protection system, characterized in that, The electric tool hand-off protection system is applied to an electric tool, and an induction coil is provided inside the shell of the electric tool at the holding position; the electric tool hand-off protection system includes: A monitoring unit, configured to, when the motor of the electric tool is running, obtain the capacitance value of the holding position in real time through the induction coil; A judging unit, configured to judge the usage action of the user of the electric tool according to the capacitance value, wherein the usage action includes a hand-off action; A control unit, configured to, when the user has the hand-off action, control the motor to reverse until the motor stops running.

10. An electric tool, characterized in that, It includes a memory and a processor; The memory is used for storing a computer program; The processor is configured to, when executing the computer program, implement the electric tool hand-off protection method according to any one of claims 1 to 8.

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