An electric screwdriver

Abstract

This utility model discloses an electric screwdriver, comprising: a main body having a power source and a grip; a battery pack disposed at the bottom of the grip and electrically connected to the power source; and an operating part. The operating part includes function buttons, a display screen, and a processor, wherein the processor is electrically connected to the power source, the battery pack, the function buttons, and the display screen. The processor receives control commands through the function buttons, controls the power source and the battery pack, and controls the display screen to show the working status. This utility model, through the intuitive visual interface of the display screen and the intelligent linkage of the function buttons, allows users to conveniently select and confirm the operating mode without reading the instruction manual, effectively avoiding damage to items caused by improper torque selection.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, specifically to an electric screwdriver. Background Technology

[0002] Electric screwdrivers are very common power tools on the market, mainly used in various scenarios such as home improvement, industrial equipment installation, and auto parts repair. To suit the usage conditions of various scenarios, electric screwdrivers are equipped with speed adjustment functions to adjust the torque to meet the working conditions of various scenarios. Currently, the speed adjustment of electric screwdrivers on the market is mainly controlled by a button switch, and the function is indicated by an LED light. The function display is relatively vague and not intuitive. Users must read the relevant instruction manual to operate it, which is very inconvenient.

[0003] Furthermore, if a user lacks experience in using the tool and uses a large torque when a small torque is required, it may damage the workpiece. Summary of the Invention

[0004] To solve the above problems, this utility model provides an electric screwdriver.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: An electric screwdriver includes: The main body has a power source for outputting torque and a gripping part suitable for holding; A battery pack, which is detachably mounted on the bottom surface of the grip and electrically connected to the power source; The operation unit includes function buttons, a display screen, and a processor; The processor is electrically connected to the power source, the battery pack, the function button, and the display screen. The processor receives control commands through the function button and controls the operation of the power source and the battery pack according to the commands. The processor is also used to control the display screen to show the working status of the electric screwdriver.

[0006] Furthermore, the display screen includes a first display area and a second display area. The first display area includes a reverse self-stop display area, a torque display area, and a power display area. The second display area includes a tool operation display area.

[0007] Furthermore, the tool operation display area is manipulated to display application scenario animations of the screwdriver under four working conditions, including application scenario animations of screws penetrating wood, screws passing through thin steel plates, screws passing through angle iron, and screws being tightened.

[0008] Furthermore, the function buttons include a reverse automatic stop button and a torque switching button. The reverse automatic stop button is used to control the processor to turn the reverse automatic stop function of the electric screwdriver on or off. The torque switching button is used to control the processor to switch the torque output range of the power source, wherein the torque output range corresponds to the working condition of the electric screwdriver.

[0009] Furthermore, the processor is electrically connected to the torque sensor of the power source, and is used to monitor the torque output of the power source based on the signal provided by the torque sensor.

[0010] Furthermore, the processor is electrically connected to the current sensor of the battery pack, and is used to monitor the current output of the battery pack based on the signal provided by the current sensor.

[0011] Furthermore, the processor is electrically connected to the display screen for outputting an animation demonstrating the working status of the screwdriver.

[0012] The advantages of this utility model over the prior art are as follows: This electric screwdriver solution significantly improves user experience and work efficiency by introducing a display screen and intuitive function buttons. Its main benefit lies in solving the pain points of unclear function displays and inconvenient operation in existing technologies. Through visual operating condition animations and clear parameter displays, users can intuitively select and confirm operating modes without consulting the manual, greatly reducing learning costs and the risk of misoperation.

[0013] Meanwhile, combined with the precise monitoring of the torque sensor and the automatic stop function for reverse rotation, damage to processed items caused by improper torque selection is effectively avoided, ensuring the accuracy and safety of operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the screwdriver structure in an embodiment of this utility model; Figure 2 This is a schematic diagram of the screwdriver (with shell removed) in an embodiment of this utility model; Figure 3 This is a schematic diagram of the function button in an embodiment of the present utility model; Figure 4a This is a schematic diagram of the display screen when the screwdriver is in working condition 1 in an embodiment of this utility model; Figure 4b This is a schematic diagram of the display screen when the screwdriver is in working condition 2 in this embodiment of the present invention; Figure 4c This is a schematic diagram of the display screen when the screwdriver is in working condition 3 in this embodiment of the present invention; Figure 4dThis is a schematic diagram of the display screen when the screwdriver is in working condition 4 in an embodiment of this utility model; Figure 5 This is a schematic diagram showing the connection between the processor and various components in an embodiment of this utility model.

[0015] In the picture: 1. Main body; 11. Shell; 12. Power source; 13. Grip part; 2. Battery pack; 3. Operating unit; 31. Function buttons; 311. Reverse automatic stop button; 312. Torque switching button; 32. Display screen; 321. First display area; 322. Second display area; 3211. Reverse automatic stop display area; 3212. Torque display area; 3213. Battery display area; 33. Processor. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0018] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0019] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two components or an interaction between two components.

[0020] Please refer to Figure 1-5 This utility model provides an electric screwdriver, including a main body 1, a battery pack 2, and an operating part 3. The main body 1 consists of a power source 12 housed in a housing 11 and a gripping part 13 extending downward from the housing 11. The power source 12 is usually an electric motor to provide various torques to meet the power requirements of various working scenarios. In this embodiment, the power source 12 is preferably a brushless motor. Brushless motors can provide higher torque output and precise speed control. The brushless motor converts electrical energy into mechanical energy through the internal electromagnetic induction principle to drive the output shaft of the screwdriver to rotate. Its speed and torque are controlled by the input current and voltage. A battery pack 2 is detachably provided at the end of the gripping part 13 away from the main body 1. Specifically, the battery pack 2 is located on the bottom surface of the gripping part 13. The battery pack 2 is electrically connected to the power source 12, and various voltage battery pack products can be selected according to user needs.

[0021] In this embodiment, the bottom of the grip 13 is adapted to different sizes of battery packs 2, forming a platform parallel to the battery pack 2. The operation unit 3 is disposed on the platform, including function buttons 31 and a display screen 32 located on the upper surface of the platform, while the processor 33 is located inside the platform and close to the function buttons 31. The processor 33 is electrically connected to the power source 12 through a motor drive module (such as an H-bridge circuit or a PWM controller). The processor 33 outputs a pulse width modulation (PWM) signal to the motor drive module to precisely control the voltage and current applied to the power source 12. The processor 33 is electrically connected to the battery pack 2 through a power management module to regulate the voltage and current output by the battery pack 2. The processor 33 is electrically connected to each function button 31 through its general-purpose input / output port, with each function button 31 corresponding to a specific input port to accommodate various user operation needs. Specifically, when the user presses a function button 31, the electrical signal generated by the button is transmitted to the corresponding port of the processor 33. After recognizing the button signal, the processor 33 parses the signal into specific control instructions according to the preset program logic and then executes the corresponding operation. The processor 33 is electrically connected to the display screen 32 via a display driver interface (such as SPI, I2C, parallel port, or dedicated display controller interface). The processor 33 transmits the working status data and graphic animations (such as working condition application scene animations) to be displayed to the driver chip of the display screen 32 through the display driver interface. After receiving the data, the driver chip of the display screen 32 controls the pixels on the display screen 32 according to the instructions to render the information into an image visible to the user.

[0022] The processor 33 of this electric screwdriver, along with its electrical connections and collaborative operation with other components, constitutes a highly efficient, intelligent, and user-friendly control system, significantly improving its ease of operation, accuracy, and safety.

[0023] Processor 33 typically refers to a microcontroller unit (MCU) or digital signal processor (DSP), which integrates a central processing unit (CPU), memory (RAM, ROM / Flash), timers, input / output (I / O) interfaces, and analog-to-digital converter (ADC). Its working principle involves executing preset program instructions to process various received sensor signals and user inputs, then generating corresponding control signals to drive the power source 12, display screen 32, and other components to complete specific tasks.

[0024] Function button 31 is usually a mechanical micro switch or touch button. When pressed, it generates an electrical signal (such as a high level or a low level) to indicate a user's operation intention.

[0025] The display screen 32 is typically a liquid crystal display screen 32 (LCD) or an organic light-emitting diode display screen 32 (OLED), which displays images and text information by controlling the brightness and color combination of pixels.

[0026] Reference Figures 4a-4d As shown in the embodiment of this utility model, the display screen 32 includes a first display area 321 and a second display area 322. The first display area 321 is located above the display screen 32 and is used to display the core parameters and current status of the electric screwdriver. This area includes the following three sub-areas: Reverse Automatic Stop Display Area 3211: The upper left corner of the diagram (within the red hexagonal icon) displays a circle icon with an arrow, indicating the on / off status of the reverse automatic stop function. When this function is on, the icon may be displayed in a specific color (such as red) or lit up, indicating its activation. This area is used to indicate whether the electric screwdriver's reverse automatic stop function is enabled. When this function is enabled, the screwdriver will automatically reverse and stop after tightening the screw to the set torque or after the screw is fully tightened, preventing over-tightening or damage, or facilitating unwinding. Users can control the on / off state of this function via function button 31 and visually confirm it in this area.

[0027] Torque display area 3212: Located to the right of the reverse automatic stop display area 3211, it clearly displays the current torque setting range of the electric screwdriver in numbers and units (such as "Nm"). For example, the attached figures show different torque ranges such as "40-60 N.m", "100-120 N.m", "160-180 N.m", and "210-230 N.m". It should be noted that the embodiments of this utility model do not only include the above torque ranges. This area is used to display the currently set torque output range of the electric screwdriver in real time. The user can select the torque level suitable for the current working scenario through function button 31, and this area will immediately update the display of the selected torque range, thereby helping the user to accurately control the tightening force and avoid damage to the workpiece or screw.

[0028] Battery level display area 3213: Located to the right of torque display area 3212, it displays the remaining battery power using a battery icon and percentage (e.g., "100%", "20%)". The number of cells or color changes within the battery icon can further indicate the power level. This area is used to visually display the remaining power of battery pack 2. Real-time battery information for processor 33 is also visualized in this area. Users can use this display to determine if charging is needed, allowing for more efficient work scheduling and preventing interruptions due to insufficient battery power.

[0029] The second display area 322 is located below the display screen 32 and includes a tool operation display area for providing animated demonstrations of tool operations. The tool operation display area identifies different operating condition numbers (such as "1", "2", "3", "4"). Each number corresponds to an application scenario animation, for example: Operating Condition 1 (… Figure 4a ): Shows an animated illustration of a screw driving into wood, accompanied by a torque range of "40-60 N.m". Operating Condition 2 ( Figure 4b ): Shows an animated illustration of a screw passing through a thin steel plate, accompanied by a torque range of "100-120 Nm". Operating Condition 3 ( Figure 4c ): Shows an animated illustration of the screw passing through the angle steel, accompanied by a torque range of "160-180 Nm". Operating Condition 4 ( Figure 4d ): Displays an animated illustration of the screws being tightened, with a torque range of "210-230 Nm".

[0030] This area is used to demonstrate the application scenarios of electric screwdrivers under four different working conditions through animation or dynamic illustrations. These scene animations not only vividly demonstrate the working process of the screwdriver in various materials and applications, but more importantly, they are closely integrated with the corresponding recommended torque range in the torque display area 3212 above. When the user switches between different working mode, the processor 33 drives the display screen 32 to update this area, playing the scene animation that best matches the current working condition. This greatly improves the convenience and accuracy of user operation, especially providing intuitive operation guidance for users unfamiliar with screwdriver use or the torque requirements of different materials.

[0031] The display screen 32 of this electric screwdriver, through reasonable area division and vivid information display, not only provides the basic status display of traditional tools, but also innovatively realizes intelligent operation guidance and human-computer interaction through working condition application scenario animations, which greatly improves user experience and work efficiency.

[0032] Reference Figure 3As shown in the embodiment of this utility model, the function button 31 includes a reverse self-stop button 311 and a torque switching button 312. The reverse self-stop button 311 is used to control the processor 33 to turn the reverse self-stop function of the electric screwdriver on or off. When the user presses or switches the reverse self-stop button 311, the button will immediately generate an electrical signal and transmit it to the processor 33. After receiving this signal, the processor 33 will turn the reverse self-stop function of the electric screwdriver on or off according to its internal preset program logic. When the reverse self-stop function is on, the processor 33 will continuously monitor the torque output signal from the torque sensor. Once the torque is detected to reach or exceed a preset threshold (e.g., the screw is fully tightened or encounters resistance), the processor 33 will immediately send a command to the power source 12 to rotate in the opposite direction a short distance and then stop. This mechanism can effectively prevent the screw from being over-tightened, which could cause material damage, or facilitate the removal of the screwdriver bit from a tightened bolt, improving the accuracy and convenience of operation. When the function is off, the electric screwdriver will work in normal mode until the user releases the trigger or other stopping conditions are met. The on or off status of the reverse self-stop function will be reflected in real time on the reverse self-stop display area 3211 of the display screen 32. Users can confirm the current function status by whether the icon is lit up.

[0033] Specifically, the torque switching button 312 is a cycle-switching button used to control the processor 33 to switch the torque output range of the power source 12. When the user presses or rotates the torque switching button 312, the button sends a signal to the processor 33, indicating that the user has selected a new torque level or mode. After receiving this signal, the processor 33 immediately switches the torque output range of the power source 12 according to its internally stored torque setting table. The processor 33 has multiple preset torque output ranges, each corresponding to specific working conditions. For example, a low torque range (e.g., 40-60 Nm) is suitable for wood or soft materials, while a high torque range (e.g., 210-230 Nm) is suitable for tightening heavy bolts or hard materials. The torque output range corresponds to the working conditions of the electric screwdriver, so that each torque level is optimized for a specific application scenario (e.g., screws penetrating wood, thin steel plates, angle steel, bolt tightening). While switching torque ranges, processor 33 also drives display screen 32 to update the corresponding working condition application scenario animation in the tool operation display area, thereby providing users with intuitive operation guidance. Processor 33 adjusts the PWM signal parameters sent to the motor drive module of power source 12 according to the selected torque range to ensure that the torque output by power source 12 remains within the selected range. Furthermore, the selected torque output range is displayed in real-time in the torque display area 3212 of display screen 32, while the corresponding working condition application scenario animation is displayed in the tool operation display area.

[0034] Reference Figure 5As shown in the embodiment of this utility model, the processor 33 is electrically connected to the torque sensor of the power source 12, and is used to monitor the torque output of the power source 12 based on the signal provided by the torque sensor. The torque sensor is typically integrated near the output shaft of the power source 12, or measures torque through other mechanical connections. It is usually a strain gauge torque sensor or a Hall effect torque sensor, capable of converting mechanical torque force into an electrical signal. When the power source 12 outputs torque, the torque sensor senses this force and generates an analog electrical signal proportional to the torque magnitude. This analog signal is converted into a digital signal by an analog-to-digital converter (ADC) and then transmitted to the processor 33. The processor 33 monitors the torque output of the power source 12 in real time based on the digital signal provided by the torque sensor. This means that the processor 33 can obtain the actual torque magnitude currently being applied by the screwdriver. Furthermore, the processor 33 filters, calibrates, and analyzes the monitored torque data to ensure data accuracy. The real-time monitored torque data is crucial for realizing the reverse self-stop function, serving as the basis for triggering reversal and stopping. At the same time, the processor 33 can also perform overload protection based on this data. Once the torque is detected to exceed the safe range, it can automatically cut off the power or reduce the output to protect the tool and the operator.

[0035] Reference Figure 5 As shown in the embodiment of this utility model, the processor 33 is electrically connected to the battery pack 2 via a current sensor. The current sensor is typically integrated into the power output path of the battery pack 2 or in the power management module. It is usually a shunt resistor combined with an amplifier circuit or a Hall effect current sensor, capable of accurately measuring the output current of the battery pack 2. When the battery pack 2 supplies power to the power source 12, the current sensor measures the current flowing through the circuit and generates an electrical signal proportional to the current magnitude. This signal is also converted into a digital signal by an analog-to-digital converter (ADC) and then transmitted to the processor 33. The processor 33 monitors the current output of the battery pack 2 in real time based on the digital signal provided by the current sensor. This allows the processor 33 to accurately understand the real-time load status and energy consumption rate of the battery. The processor 33 combines the monitored current value, battery voltage, and battery characteristic curve (stored in ROM) to accurately estimate the remaining battery capacity using Coulomb counting or other advanced algorithms. If the monitored current is momentarily too large (e.g., a screwdriver jams), the processor 33 can quickly cut off the power supply to prevent damage to the battery and the power source 12. The processor 33 can dynamically adjust the performance of the power source 12 according to the current output, automatically entering energy-saving mode or prompting charging when the battery power is low. In addition, the processor 33 transmits and updates the accurately estimated remaining battery power information to the power display area 3213 of the display screen 32 in real time, presenting it to the user intuitively in the form of a battery icon and percentage.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An electric screwdriver characterized by comprising: include: The main body has a power source for outputting torque and a gripping part suitable for holding; A battery pack, which is detachably mounted on the bottom surface of the grip and electrically connected to the power source; The operation unit includes function buttons, a display screen, and a processor; The processor is electrically connected to the power source, the battery pack, the function button, and the display screen. The processor receives control commands through the function button and controls the operation of the power source and the battery pack according to the commands. The processor is also used to control the display screen to show the working status of the electric screwdriver.

2. The electric screwdriver according to claim 1, characterized in that: The display screen includes a first display area and a second display area. The first display area includes a reverse self-stop display area, a torque display area, and a power display area. The second display area includes a tool operation display area.

3. The electric screwdriver according to claim 2, characterized in that: The tool operation display area is manipulated to display application scenario animations of the screwdriver under four working conditions, including application scenario animations of screws penetrating wood, screws passing through thin steel plates, screws passing through angle iron, and screws being tightened.

4. The electric screwdriver according to claim 1, characterized in that: The function buttons include a reverse automatic stop button and a torque switching button. The reverse automatic stop button is used to control the processor to turn the reverse automatic stop function of the electric screwdriver on or off. The torque switching button is used to control the processor to switch the torque output range of the power source, wherein the torque output range corresponds to the working condition of the electric screwdriver.

5. The electric screwdriver according to claim 1, characterized in that: The processor is electrically connected to the torque sensor of the power source and is used to monitor the torque output of the power source based on the signal provided by the torque sensor.

6. The electric screwdriver according to claim 1, characterized in that: The processor is electrically connected to the current sensor of the battery pack and is used to monitor the current output of the battery pack based on the signal provided by the current sensor.

7. The electric screwdriver according to claim 1, characterized in that: The processor is electrically connected to the display and is used to output an animation demonstrating the working status of the screwdriver.

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