Output shaft of screwdriver and electric tool

Abstract

The invention provides an output shaft of a screwdriver and an electric tool, and relates to the technical field of electric tools. An output shaft of the screwdriver is used for driving a workpiece to rotate and provided with a signal transmitting module and a transmitting coil. The signal transmitting module comprises a signal transmitting circuit used for collecting an analog signal, performing digital processing on the analog signal to generate a digital signal, and generating a control signal according to the digital signal; the load effect circuit is connected with the signal transmitting circuit and is used for adjusting the load state of the transmitting coil by controlling the on and off of a switching device according to the control signal so as to generate a modulated pulse signal represented by an electromagnetic signal in the transmitting coil; and the transmitting coil wirelessly transmits an electromagnetic signal to the signal receiving module in an electromagnetic induction mode. According to the scheme, the transmission mode that analog signals are subjected to digital processing and then modulated is adopted, the transmission precision of sensor signals is improved, and high-precision and high-stability dynamic signal transmission in the screwdriver is achieved.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and more specifically to the output shaft of a screwdriver and a power tool. Background Technology

[0002] To meet the demands of high-precision assembly, some screwdriver products are equipped with sensors to collect parameters such as torque and angle. These products employ a mutual inductance coil structure. The signal transmitter amplifies the collected analog signal through an instrumentation amplifier, and then converts the analog signal into a corresponding frequency signal through an analog frequency conversion chip for transmission. The signal receiver decodes the signal by detecting frequency changes.

[0003] However, because these products use high-speed pulse signals for transmission, their operating frequency range is limited; at the same time, analog frequency conversion chips are susceptible to temperature drift and electromagnetic interference, resulting in limited signal conversion accuracy. Therefore, the signal transmission accuracy of these products is relatively low. Summary of the Invention

[0004] This application provides an output shaft for a screwdriver and a power tool, which can improve the transmission accuracy of signals acquired by sensors in the screwdriver.

[0005] In a first aspect, this application provides an output shaft for a screwdriver, wherein the output shaft is equipped with a signal transmitting module and a transmitting coil; the signal transmitting module includes: a signal transmitting circuit for acquiring analog signals, digitizing the analog signals to generate digital signals, and generating control signals based on the digital signals; a load effect circuit connected to the signal transmitting circuit for adjusting the load state of the transmitting coil by controlling the on and off states of a switching device according to the control signals, so as to generate a modulated pulse signal characterized by an electromagnetic signal in the transmitting coil; wherein the modulation method includes frequency modulation, amplitude modulation, and / or phase modulation; the transmitting coil wirelessly transmits the electromagnetic signal to a signal receiving module by electromagnetic induction.

[0006] Optionally, the load effect circuit includes a first switching device, a first capacitor, a first resistor, a second resistor, and a third resistor; wherein, the first end of the first resistor is connected to the output terminal of the signal transmitting module, and its second end is connected to the first end of the second resistor and connected to the control terminal of the first switching device; the second end of the second resistor is connected to the second end of the first switching device and grounded; the third end of the first switching device is connected to the first end of the first capacitor and connected to the input power supply, and the second end of the first capacitor is grounded.

[0007] Optionally, the signal transmitting circuit includes a sensing acquisition circuit; the sensing acquisition circuit is used to acquire analog signals of the target object and digitize the analog signals through an analog-to-digital converter to generate the digital signals.

[0008] Optionally, the signal transmitting circuit includes a transmitting end control circuit; the transmitting end control circuit is connected to the sensing acquisition circuit through a serial communication interface to receive the digital signal and generate a control signal based on the digital signal.

[0009] Optionally, the signal transmitting module further includes a rectifier circuit and a transmitting power supply circuit; wherein, the rectifier circuit is connected to the transmitting coil and is used to rectify the AC voltage induced by the transmitting coil to generate a DC voltage; the transmitting power supply circuit is connected to the rectifier circuit and is used to regulate the DC voltage to provide operating voltage for the circuits in the signal transmitting module.

[0010] Secondly, this application provides an electric tool, which includes an output shaft of a screwdriver as described in the first aspect, and further includes a receiving coil and a signal receiving module disposed outside the output shaft; wherein the receiving coil and the transmitting coil form a mutual inductance coil through magnetic coupling for non-contact transmission of electrical energy and signals; the signal receiving module is connected to the receiving coil and is used to provide a carrier signal and operating voltage to the signal transmitting module through the receiving coil, and to receive electromagnetic signals modulated by the transmitting coil.

[0011] Optionally, the signal receiving module includes a coil driving circuit; the coil driving circuit is connected to the receiving coil and is used to provide an excitation signal to the receiving coil to generate an alternating magnetic field between the receiving coil and the transmitting coil, thereby providing the carrier signal and operating voltage to the signal transmitting module.

[0012] Optionally, the signal receiving module further includes a receiving end control circuit; the receiving end control circuit is connected to the coil driving circuit and is used to adjust the excitation signal of the coil driving circuit.

[0013] Optionally, the signal receiving module further includes a signal decoding circuit; the signal decoding circuit is connected to the receiving coil and the receiving end control circuit, and is used to receive the electromagnetic signal induced by the receiving coil, decode the electromagnetic signal to extract a digital signal, and transmit the digital signal to the receiving end control circuit.

[0014] Optionally, the signal receiving module includes a receiving power supply circuit; the receiving power supply circuit is used to provide operating voltage for the circuits in the signal receiving module.

[0015] In several embodiments provided in this application, a signal transmitting module and a transmitting coil are installed on the output shaft of the screwdriver. The signal transmitting module adopts a transmission method that digitally processes the analog signal and then modulates it, replacing the transmission method in related technologies that amplifies the analog signal and then converts it by frequency. This improves the transmission accuracy of the sensor signal and realizes high-precision dynamic signal transmission in the screwdriver. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the sensor structure of a screwdriver in related technologies.

[0018] Figure 2 This is a schematic diagram of the output shaft structure of a screwdriver provided in one embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the structure of a signal transmitting module provided in one embodiment of this application.

[0020] Figure 4 A partial circuit schematic of a signal transmission module provided in one embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the structure of an electric tool provided in one embodiment of this application.

[0022] Figure 6 This is a schematic diagram of a signal receiving module provided in one embodiment of this application. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0024] In the description of the embodiments of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] With the improvement of industrial automation, rotary power tools are increasingly widely used in intelligent manufacturing and precision assembly. Screwdrivers, as common rotary assembly tools, are also evolving towards intelligent and information-based functions. To achieve high-precision control during the tightening process, some screwdriver products integrate or are equipped with sensors that can collect key parameters such as torque and angle of the output shaft in real time, thereby achieving precise control of the assembly state. In these intelligent screwdriver products, since the output shaft is rotating, it is necessary to simultaneously achieve non-contact power supply to the sensor and wireless signal transmission. Therefore, related technologies employ a mutual inductance coil structure, utilizing the principle of magnetic coupling to transmit energy and data between rotating and stationary components.

[0026] For details, please refer to Figure 1 The sensor structure of this type of screwdriver product is as follows: the transmitter end of the sensor is equipped with an instrumentation amplifier 110, which amplifies the acquired analog signal; then, an analog frequency conversion chip (such as a Voltage-to-Frequency Converter, VFC) 120 converts the amplified analog signal into a modulated signal of the corresponding frequency. Then, using two sets of mutually inductive coils, namely the transmitting coil and the power supply coil 130, the frequency signal is transmitted to the receiver end via magnetic induction; the receiver end reconstructs the sensor data by detecting frequency changes. Although this type of product structure has a certain non-contact transmission capability, in practical applications, because the related products use high-speed pulse signals output by the analog frequency conversion chip 120 for transmission, its operating frequency range is limited, easily leading to insufficient signal resolution and transmission capability; at the same time, because the analog frequency conversion chip 120 is susceptible to temperature drift and electromagnetic interference, the signal conversion accuracy is limited; furthermore, under high-speed rotation and complex working conditions, the stability of the frequency signal is also easily affected. Therefore, the acquired signal transmission accuracy of related technology products is low, and drift or distortion is prone to occur during operation, making it difficult to meet the requirements of high-precision applications.

[0027] Therefore, it is necessary to provide a new screwdriver structure that can improve the accuracy of sensor signal acquisition and transmission while maintaining non-contact power supply and signal transmission functions, so as to meet the application requirements of high precision.

[0028] Please see Figure 2 , Figure 2An output shaft 200 for a screwdriver is provided in this embodiment. The output shaft 200 is used to drive the workpiece to rotate. A signal transmitting module 210 and a transmitting coil 220 are mounted on the output shaft 200. The signal transmitting module 210 includes a signal transmitting circuit 211 for acquiring analog signals, digitizing the analog signals to generate digital signals, and generating control signals based on the digital signals; and a load effect circuit 212 connected to the signal transmitting circuit 211 for adjusting the load state of the transmitting coil by controlling the on and off states of switching devices according to the control signals, so as to generate a modulated pulse signal characterized by electromagnetic signals in the transmitting coil 220; wherein the modulation method includes frequency modulation, amplitude modulation, and / or phase modulation. The transmitting coil 220 wirelessly transmits the electromagnetic signals to the signal receiving module via electromagnetic induction.

[0029] In this embodiment, both the signal transmitting module 210 and the transmitting coil 220 are mounted on the output shaft 200. The signal transmitting module 210 includes a signal transmitting circuit 211 and a load effect circuit 212. The signal transmitting circuit 211 can be used to perform analog-to-digital conversion on the acquired analog signal to obtain a stable digital signal, and generate a control signal based on the digital signal. The load effect circuit 212 is connected to the signal transmitting circuit 211 and can be used to dynamically adjust the load state in the transmitting coil 220 circuit by controlling the on and off of corresponding switching devices (such as transistors or MOSFETs) according to the control signal output by the signal transmitting circuit 211. By controlling the change of load, the transmitting coil 220 can be loaded or removed from the load within a specific time period, thereby generating a modulated pulse current signal in the transmitting coil 220, which forms a corresponding modulated electromagnetic signal. The modulation method can include at least one of frequency modulation, amplitude modulation, or phase modulation. The transmitting coil 220 then wirelessly transmits the electromagnetic signal to the signal receiving module through electromagnetic induction. The signal receiving module can further recover the digital signal through the corresponding demodulation circuit, and then perform subsequent data analysis and processing.

[0030] Compared to related technologies that amplify analog signals using an instrumentation amplifier and then generate frequency signals via an analog frequency conversion chip for transmission, this embodiment uses a signal transmission method that digitizes the analog signal before modulation. This reduces signal errors and distortions caused by fluctuations in the characteristics of analog circuits. Simultaneously, the combination of signal modulation and digital signal processing enhances the signal's noise immunity in electromagnetic interference environments and improves the stability of signal transmission. Furthermore, by integrating the signal transmitting module 210 and the transmitting coil 220 onto the screwdriver's output shaft, the structure becomes more compact, facilitating deployment in rotating parts and making it suitable for dynamic signal acquisition and wireless transmission in power tools.

[0031] Therefore, this embodiment improves the transmission accuracy and reliability of sensor signals by replacing the related analog amplification and frequency conversion methods with digital conversion and modulation communication methods, overcoming the problems of insufficient signal transmission accuracy and poor stability in related technologies, and can meet the needs of industrial assembly applications with high requirements for acquisition accuracy and transmission stability.

[0032] In some embodiments, the load effect circuit 212 includes a first switching device, a first capacitor, a first resistor, a second resistor, and a third resistor. The first terminal of the first resistor is connected to the output terminal of the signal transmitting circuit 211, and its second terminal is connected to the first terminal of the second resistor and then to the control terminal of the first switching device. The second terminal of the second resistor is connected to the second terminal of the first switching device and grounded. The third terminal of the first switching device is connected to the first terminal of the first capacitor and then to the input power supply, and the second terminal of the first capacitor is grounded.

[0033] In this embodiment, the first end of the first resistor in the load effect circuit 212 is connected to the output terminal of the signal transmitting circuit 211, and the second end of the first resistor is connected to the control terminal of the first switching device. The first switching device can specifically be a transistor, MOSFET, or other controllable switching device. For example, when the first switching device is an NPN transistor, its control terminal (base) is connected to the second end of the first resistor; its second end (emitter) is connected to the second end of the second resistor and grounded; and its third end (collector) is connected to the first end of the first capacitor and connected to the input power supply. Based on the control signal output by the signal transmitting circuit 211, the load effect circuit 212 can control the conduction or cutoff of the first switching device, thereby dynamically adjusting the load state in the transmitting coil circuit, causing the equivalent impedance of the transmitting coil to change accordingly, thereby achieving modulation of the carrier signal.

[0034] In some embodiments, the signal transmitting circuit 211 includes a sensing acquisition circuit; the sensing acquisition circuit is used to acquire analog signals of the target object and digitize the analog signals through an analog-to-digital converter to generate digital signals.

[0035] by Figure 3For example, in this embodiment, the signal transmitting circuit 211 includes a sensing acquisition circuit 213. The sensing acquisition circuit 213 includes a power port and a signal port for connecting to an analog sensor, and can be adapted to different types of analog sensors (e.g., strain gauge torque sensors, angle-coded sensors, etc.). The sensing acquisition circuit 213 also includes an analog-to-digital converter (ADC), which converts the analog signals acquired by the analog sensors into corresponding digital signals for subsequent modulation and transmission processing. Furthermore, the sensing acquisition circuit may also include a filtering circuit, which can be used to suppress noise and preprocess the input analog signals, thereby improving sampling accuracy and the stability of the digital signals. The ADC and filtering circuit can be implemented using existing electronic devices or circuit structures. For example, the ADC can be an existing ADC chip with the aforementioned analog-to-digital conversion function (e.g., the AD7192 chip), and the filtering circuit can be an existing low-pass or band-pass filter with the aforementioned filtering function; these will not be elaborated further here.

[0036] This embodiment enables analog signals to be digitized within the signal transmitting circuit 211 by setting up a sensing acquisition circuit 213. This avoids distortion and errors caused by line interference or electromagnetic environment fluctuations during the transmission of analog signals, and helps to improve the accuracy of signal transmission.

[0037] In some embodiments, the signal transmitting circuit 211 includes a transmitting end control circuit; the transmitting end control circuit is connected to the sensing acquisition circuit through a serial communication interface to receive digital signals and generate control signals based on the digital signals.

[0038] In this embodiment, the signal transmitting circuit 211 includes a transmitting end control circuit. The transmitting end control circuit is connected to the sensing and acquisition circuit 213 via a serial communication interface. It can receive digital signals after analog-to-digital conversion, analyze and process the received digital signals, and generate control signals according to a preset communication protocol to drive subsequent circuits to modulate the carrier signal. Compared to the method in related technologies that uses analog signals to directly drive analog frequency conversion chips, this embodiment transmits digital signals through a serial communication interface, which can effectively suppress signal distortion caused by line interference, temperature drift, and other factors during analog signal transmission, improving signal integrity and anti-interference capabilities during transmission.

[0039] by Figure 3For example, in this embodiment, the signal transmitting circuit 211 includes a transmitting end control circuit 214. The transmitting end control circuit 214 is connected to the sensing acquisition circuit 213 via a serial communication interface (e.g., an SPI interface) and is used to receive digital signals output by the analog-to-digital converter. The transmitting end control circuit 214 can parse and process the received digital signals and generate control signals for amplitude modulation, frequency modulation, or phase modulation according to a preset communication protocol to drive subsequent circuits to modulate the carrier signal. The transmitting end control circuit 214 can be implemented using existing electronic devices or circuit structures, such as a microcontroller (e.g., an STM32 series microcontroller) or combinational logic circuits with the aforementioned control functions. This structural design effectively suppresses signal distortion during analog signal transmission, improving the integrity and accuracy of the signal during transmission.

[0040] In some embodiments, the signal transmitting module 210 further includes a rectifier circuit and a transmitter power supply circuit; wherein, the rectifier circuit is connected to the transmitting coil and is used to rectify the AC voltage induced by the transmitting coil to generate a DC voltage; the transmitter power supply circuit is connected to the rectifier circuit and is used to regulate the DC voltage to provide operating voltage for the circuits in the signal transmitting module.

[0041] In this embodiment, the signal transmitting module 210 includes a rectifier circuit and a transmitting power supply circuit. The rectifier circuit is connected to the transmitting coil 220 and is used to receive the AC voltage induced by the transmitting coil 220, and to rectify the AC voltage to convert it into DC voltage. The rectifier circuit can, for example, adopt a bridge rectifier structure and can be used with a filter capacitor to stabilize the output voltage waveform. The transmitting power supply circuit is connected to the rectifier circuit and is used to regulate the rectified DC voltage to ensure that the output voltage is maintained within a set range, thereby providing the required operating voltage for the sensing acquisition circuit 213, the transmitting control circuit 214, and the load effect circuit 212 in the signal transmitting module 210, ensuring the continuous and stable operation of the signal transmitting module without external power supply.

[0042] Specifically, with Figure 3 For example, Figure 3The signal transmitting module 210 includes a rectifier circuit 215 and a transmitter power supply circuit 216. The rectifier circuit 215 is connected to the transmitting coil 220 and is used to rectify the AC voltage induced by the transmitting coil 220 and output a DC voltage. The transmitter power supply circuit 216 is connected to the rectifier circuit 215 and is used to regulate the DC voltage, supplying the stable operating voltage to the sensing acquisition circuit 213, the transmitter control circuit 214, and the load effect circuit 212 in the signal transmitting module 210, ensuring the continuous and stable operation of the signal transmitting module 210 without external power supply. The rectifier circuit 215 and the transmitter power supply circuit 216 can be implemented using existing electronic devices or circuit structures. For example, the rectifier circuit 215 can be an existing diode bridge rectifier circuit with the aforementioned rectification function, and the transmitter power supply circuit 216 can be an existing linear voltage regulator with the aforementioned voltage regulation function (such as the LM7805 voltage regulator), which will not be elaborated further here. Through this structural design, this embodiment realizes a non-contact power supply method based on electromagnetic induction. It can provide stable power supply to the signal transmission module 210 during rotation without relying on an external power source, thus providing power support for the continuous acquisition and reliable transmission of dynamic wireless signals.

[0043] In a specific example, the transmitter control circuit 214 uses an STM32 microcontroller, the first switching device in the load effect circuit 212 uses an NPN transistor, and the rectifier circuit 215 uses a diode bridge rectifier circuit. The circuit structure and connection relationships of the transmitter control circuit 214, load effect circuit 212, rectifier circuit 215, and transmitter coil 220 are shown in the reference [reference needed]. Figure 4As shown. In this embodiment, the load effect circuit 212 includes a first switching device Q1, a first capacitor C1, a first resistor R1, a second resistor R2, and a third resistor R3. The transmitter control circuit 214 uses an STM32 microcontroller U1. One output terminal of the microcontroller U1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and then to the base of the first switching device Q1. The second terminal of the second resistor R2 is connected to the emitter of the first switching device Q1 and grounded. The collector of the first switching device Q1 is connected to the first terminal of the first capacitor C1 and then to the input power supply VCC. The second terminal of the first capacitor C1 is grounded. The rectifier circuit 215 includes a first bridge arm and a second bridge arm connected in parallel. The first bridge arm includes a first diode D1 and a second diode D2 connected in series. The second bridge arm includes a third diode D3 and a fourth diode D4 connected in series. In this design, the anode of the first diode D1 is connected to the cathode of the second diode D2, and then to one end of the transmitting coil L1. The anode of the third diode D3 is connected to the cathode of the fourth diode D4, and then to the other end of the transmitting coil L1. The cathodes of the first diode D1 and the third diode D3 are connected to the input power supply VCC; the anodes of the second diode D2 and the fourth diode D4 are connected to ground. This structural design effectively realizes a digitally controlled carrier modulation process, improving the consistency and anti-interference capability of wireless signal transmission. It is suitable for rotating equipment where high signal accuracy and transmission stability are required.

[0044] Please see Figure 5 This application also provides a power tool 300. The power tool 300 includes the output shaft of a screwdriver as described in any of the above embodiments, and further includes a receiving coil 320 and a signal receiving module 310 disposed outside the screwdriver output shaft. The receiving coil 320 and the transmitting coil 220 form a mutual inductance coil via magnetic coupling, used for non-contact transmission of electrical energy and signals. The signal receiving module 310 is connected to the receiving coil 320 and is used to provide a carrier signal and operating voltage to the signal transmitting module 210 through the receiving coil 320, and to receive electromagnetic signals modulated by the transmitting coil 220.

[0045] In this embodiment, the screwdriver's output shaft includes a signal transmitting module 210 and a transmitting coil 220. The signal transmitting module 210 acquires analog signals, and after digitization and modulation processing, drives the transmitting coil 220 to generate modulated electromagnetic signals. A receiving coil 320 and a signal receiving module 310 are externally disposed on the screwdriver's output shaft. The receiving coil 320 and the transmitting coil 220 form a mutual inductance coil through magnetic coupling, realizing non-contact transmission of electrical energy and signals. Specifically, the electromagnetic signal generated by the transmitting coil 220 is transmitted to the receiving coil 320 through magnetic field coupling, thereby realizing wireless signal transmission. After sensing the electromagnetic signal, the receiving coil 320 converts it into an electrical signal and transmits it to the signal receiving module 310. The signal receiving module 310 is connected to the receiving coil 320 and provides a carrier signal and operating voltage to the signal transmitting module 210 through the receiving coil 320. Simultaneously, the signal receiving module 310 converts the received electrical signal into a digital signal and performs demodulation processing to extract valid sensor data and information. Through this structural design, the signal transmitting module 210 and the signal receiving module 310 can perform bidirectional non-contact transmission while the power tool is rotating, realizing reliable exchange of data and energy.

[0046] The power tool structure of this embodiment effectively overcomes the problems of insufficient signal transmission accuracy and poor stability in related technologies. Compared with the method of using two sets of coils to realize power supply and signal transmission separately in related technologies, this structure only uses a single set of coils to simultaneously complete the transmission of electrical energy and signals, thereby reducing the number of components, simplifying the overall structure, and reducing manufacturing costs. This structural design can operate continuously and stably when the power tool is rotating, improving the signal transmission accuracy and stability, and meeting the application requirements of industrial assembly with high requirements for signal acquisition accuracy and transmission stability.

[0047] In some embodiments, the signal receiving module 310 includes a coil driving circuit; the coil driving circuit is connected to the receiving coil 320 and is used to provide an excitation signal to the receiving coil 320 to generate an alternating magnetic field between the receiving coil 320 and the transmitting coil 220, thereby providing a carrier signal and operating voltage to the signal transmitting module 210.

[0048] In this embodiment, the signal receiving module 310 includes a coil driving circuit. The coil driving circuit is connected to the receiving coil 320 and provides an appropriate excitation signal to the receiving coil 320 to activate it, generating an alternating magnetic field between it and the transmitting coil 220. The receiving coil 320 senses the electromagnetic signal from the transmitting coil 220, converts it into an electrical signal, and transmits it to the signal receiving module 310. During this process, the receiving coil 320 also maintains the alternating magnetic field with the transmitting coil 220 through magnetic coupling, providing a stable carrier signal and operating voltage to the signal transmitting module 210. The carrier signal is a high-frequency signal used to transmit modulation information and can be transmitted to the signal transmitting module 210 through the receiving coil 320. The operating voltage provides the necessary power support for the various functional circuits in the signal transmitting module, maintaining their stable operation.

[0049] Specifically, with Figure 6 For example. Figure 6 The signal receiving module 310 includes a coil driving circuit 311. The coil driving circuit 311 is connected to the receiving coil 320. By providing an appropriate excitation signal to the receiving coil 320, it activates the receiving coil 320 and creates an alternating magnetic field between it and the transmitting coil 220. Under the action of the excitation signal, the receiving coil 320 senses the electromagnetic signal from the transmitting coil 220, converts it into an electrical signal, and transmits it to the signal receiving module 310. Simultaneously, the receiving coil 320 maintains the alternating magnetic field with the transmitting coil 220 through magnetic coupling, providing a stable carrier signal and operating voltage for the signal transmitting module 210. The coil driving circuit 311 can be implemented using existing electronic devices or circuit structures. Specifically, the coil driving circuit 311 can control the coil driving chip to output a periodic signal with the same frequency as the PWM signal through two complementary PWM signals, causing the receiving coil 230 to generate an alternating current with the same frequency as the PWM, thereby forming an alternating magnetic field to achieve energy and signal transmission. For example, the coil drive circuit 311 can be constructed using a gate drive chip in conjunction with a power MOSFET or GaN FET to form a drive stage. The gate drive chip can be implemented using a driver with the aforementioned coil drive function (such as a TPS2823 driver). Through this structural design, the receiving coil 320 not only realizes the signal receiving function, but also provides stable power support and carrier signal for the signal transmitting module 210, realizing bidirectional non-contact signal and energy transmission, which helps the screwdriver to work efficiently and stably in the rotating state.

[0050] In some embodiments, the signal receiving module 310 further includes a receiving end control circuit; the receiving end control circuit is connected to the coil driving circuit 311 and is used to adjust the excitation signal of the coil driving circuit 311.

[0051] In this embodiment, the receiver control circuit is connected to the coil drive circuit 311, which can adjust the excitation signal of the coil drive circuit 311 to enable the receiving coil 320 to generate an alternating magnetic field of appropriate intensity and frequency under different operating conditions, thereby achieving efficient signal reception and energy transmission. The receiver control circuit can dynamically adjust the excitation signal according to actual working requirements, thus adapting to different working environments and signal conditions.

[0052] Specifically, with Figure 6 For example. Figure 6 The signal receiving module 310 includes a receiver control circuit 312. The receiver control circuit 312 is connected to the coil drive circuit 311 and can adjust the excitation signal of the coil drive circuit 311 to generate an alternating magnetic field of appropriate strength and frequency in the receiving coil 320 under different operating conditions, ensuring high efficiency in signal reception and energy transmission. For example, when the signal strength is weak, the receiver control circuit 312 can increase the amplitude of the excitation signal (such as a PWM signal) to enhance the alternating magnetic field and improve signal reception efficiency; conversely, if the signal strength is strong, the receiver control circuit 312 reduces the amplitude of the excitation signal to avoid overload and reduce interference. The receiver control circuit 312 can be implemented using existing electronic devices or circuit structures, such as a microcontroller (such as an STM32 series microcontroller) or combinational logic circuits with the above-mentioned control functions. This structural design enhances the adaptability of the signal receiving module under different operating conditions and optimizes the efficiency and stability of signal reception and energy transmission.

[0053] In some embodiments, the signal receiving module 310 further includes a signal decoding circuit; the signal decoding circuit is connected to the receiving coil 320 and the receiving end control circuit 312, and is used to receive the electromagnetic signal induced by the receiving coil 320, decode the electromagnetic signal to extract the digital signal, and transmit the digital signal to the receiving end control circuit 312.

[0054] In this embodiment, the signal decoding circuit processes the received electromagnetic signal, removing noise, useless signals, or interference signals, and extracting the valid digital signal. The decoded digital signal can be transmitted to the receiving control circuit 312 via a data interface for subsequent processing. The receiving control circuit 312 can parse, store, or forward the digital signal to other system modules according to actual needs, realizing the acquisition and application of sensor data.

[0055] Specifically, with Figure 6 For example. Figure 6The signal receiving module 310 includes a signal decoding circuit 313. The signal decoding circuit 313 is connected to the receiving coil 320 and the receiving end control circuit 312, and processes the received electromagnetic signal to remove noise, unwanted signals, or interference signals, extracting the valid digital signal. The signal decoding circuit 313 can be implemented using existing electronic devices or circuit structures, such as a decoder with the above-mentioned decoding function (e.g., the TLV320ADC series decoder), which will not be elaborated further here. The decoded digital signal is transmitted to the receiving end control circuit 312, which can parse, store, or forward the digital signal to other system modules according to actual needs, realizing the acquisition and application of sensor data.

[0056] In some embodiments, the signal receiving module 310 includes a receiving power supply circuit; the receiving power supply circuit is used to provide operating voltage to the circuits in the signal receiving module 310.

[0057] In this embodiment, the signal receiving module 310 includes a receiving power supply circuit. This circuit converts external power into a stable voltage, providing the necessary operating voltage for each functional circuit within the signal receiving module 310. Furthermore, the receiving power supply circuit can also supply power to the signal transmitting module 210 via the receiving coil 320, enabling the signal transmitting module 210 to operate continuously without an external power source. Specifically, the receiving power supply circuit may include a voltage regulation unit such as a low-dropout linear regulator or a DC-DC converter to provide multiple stable operating voltages according to the voltage requirements of different functional circuits, thereby improving the compatibility and stability of the power tool product.

[0058] Specifically, with Figure 6 For example. Figure 6 The signal receiving module 310 includes a receiver power supply circuit 314. The receiver power supply circuit 314 converts external power into a stable voltage, providing the necessary operating voltage (as shown by the dashed line) for the coil drive circuit 311, receiver control circuit 312, and signal decoding circuit 313 within the signal receiving module 310. The receiver power supply circuit 314 also supplies power to the signal transmitting module 210 via the receiving coil 320, enabling the signal transmitting module 210 to operate continuously without an external power source. The receiver power supply circuit 314 can be implemented using existing electronic devices or circuit structures, such as existing linear voltage regulators with the aforementioned voltage regulation function (e.g., the LM7805 regulator), which will not be elaborated upon here. The receiver power supply circuit 314 can provide multiple stable operating voltages according to the voltage requirements of different functional circuits, thereby improving the compatibility and stability of the screwdriver product.

[0059] For the other specific functions and effects of the circuit modules of the power tool in this embodiment, please refer to the foregoing embodiments for comparison and explanation, and will not be repeated here.

[0060] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0061] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments of this application, and are not intended to limit the scope of the invention.

[0062] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0063] It is understood that the various embodiments described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0064] Unless otherwise stated, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0065] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0066] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0067] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0068] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. An output shaft for a screwdriver, characterized in that, The output shaft is used to drive the workpiece to rotate, and the output shaft is equipped with a signal transmitting module and a transmitting coil; The signal transmitting module includes: A signal transmitting circuit is used to acquire analog signals, digitize the analog signals to generate digital signals, and generate control signals based on the digital signals. A load effect circuit, connected to the signal transmitting circuit, is used to adjust the load state of the transmitting coil by controlling the on and off states of the switching devices according to the control signal, so as to generate a modulated pulse signal characterized by electromagnetic signals in the transmitting coil; wherein the modulation method includes frequency modulation, amplitude modulation and / or phase modulation; The transmitting coil wirelessly transmits the electromagnetic signal to the signal receiving module via electromagnetic induction.

2. The output shaft according to claim 1, characterized in that, The load effect circuit includes a first switching device, a first capacitor, a first resistor, a second resistor, and a third resistor; wherein, The first end of the first resistor is connected to the output terminal of the signal transmitting circuit, and its second end is connected to the first end of the second resistor and connected to the control terminal of the first switching device; the second end of the second resistor is connected to the second end of the first switching device and grounded; the third end of the first switching device is connected to the first end of the first capacitor and connected to the input power supply, and the second end of the first capacitor is grounded.

3. The output shaft according to claim 1, characterized in that, The signal transmitting circuit includes a sensing and acquisition circuit; the sensing and acquisition circuit is used to acquire analog signals of the target object and digitize the analog signals through an analog-to-digital converter to generate the digital signals.

4. The output shaft according to claim 3, characterized in that, The signal transmitting circuit includes a transmitting end control circuit; the transmitting end control circuit is connected to the sensing acquisition circuit through a serial communication interface to receive the digital signal and generate a control signal based on the digital signal.

5. The output shaft according to any one of claims 1 to 4, characterized in that, The signal transmitting module further includes a rectifier circuit and a transmitter power supply circuit; wherein... The rectifier circuit is connected to the transmitting coil and is used to rectify the AC voltage induced by the transmitting coil to generate DC voltage. The transmitter power supply circuit is connected to the rectifier circuit and is used to regulate the DC voltage to provide operating voltage for the circuits in the signal transmission module.

6. A power tool, characterized in that, The screwdriver includes an output shaft as described in any one of claims 1 to 5, and further includes a receiving coil and a signal receiving module disposed outside the output shaft; wherein, The receiving coil and the transmitting coil are magnetically coupled to form a mutual inductance coil, which is used for non-contact transmission of electrical energy and signals; The signal receiving module is connected to the receiving coil and is used to provide a carrier signal and operating voltage to the signal transmitting module through the receiving coil, and to receive electromagnetic signals modulated by the transmitting coil.

7. The power tool according to claim 6, characterized in that, The signal receiving module includes a coil driving circuit; the coil driving circuit is connected to the receiving coil and is used to provide an excitation signal to the receiving coil to generate an alternating magnetic field between the receiving coil and the transmitting coil, thereby providing the carrier signal and operating voltage to the signal transmitting module.

8. The power tool according to claim 7, characterized in that, The signal receiving module further includes a receiving end control circuit; the receiving end control circuit is connected to the coil driving circuit and is used to adjust the excitation signal of the coil driving circuit.

9. The power tool according to claim 8, characterized in that, The signal receiving module further includes a signal decoding circuit; the signal decoding circuit is connected to the receiving coil and the receiving end control circuit, and is used to receive the electromagnetic signal induced by the receiving coil, decode the electromagnetic signal to extract a digital signal, and transmit the digital signal to the receiving end control circuit.

10. The power tool according to any one of claims 6 to 9, characterized in that, The signal receiving module includes a receiving power supply circuit; the receiving power supply circuit is used to provide operating voltage to the circuits in the signal receiving module.

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