Power tool

Abstract

This application provides a power tool, comprising: a power assembly; a tightening assembly including a working head and a drive shaft movably connected axially, the working head for engaging a workpiece, and an output shaft of the power assembly connected to the drive shaft to drive the tightening assembly to rotate; and a torque detection assembly fixed to the drive shaft and rotating synchronously with it. According to this application, the working head and drive shaft are axially connected, which can accommodate axial deviations in the workpiece position during installation. The drive shaft is located inside the power tool, and its installation position is relatively fixed, making it less affected by external working conditions. By placing the torque detection assembly on the drive shaft, torque changes can be monitored in real time in a more stable environment, avoiding the influence of external interference on the signal, thereby improving the accuracy and reliability of torque measurement.

Description

Technical Field

[0001] This utility model relates to the field of screw tightening tools, specifically to an electric tool. Background Technology

[0002] In modern industrial production, construction, and routine equipment maintenance, power tools have significantly improved work efficiency. Traditional power tools often lack precise force signal detection mechanisms, making it impossible to accurately detect torque values ​​during the tightening process in real time. This can lead to problems such as excessive torque damaging the workpiece or insufficient torque resulting in insecure installation when installing parts, severely impacting installation quality and the normal performance of the equipment.

[0003] Therefore, there is an urgent need for a new type of power tool. Utility Model Content

[0004] In view of this, the present invention aims to provide an electric tool to solve the problem of inaccurate torque measurement in existing electric tools.

[0005] This application provides an electric tool, comprising:

[0006] Power components;

[0007] A screwing assembly, comprising a working head and a drive shaft movably connected along an axial direction, the working head being used to clamp a workpiece, and the output shaft of a power assembly being connected to the drive shaft to drive the screwing assembly to rotate;

[0008] A torque detection component is fixed on the drive shaft and rotates synchronously with the drive shaft.

[0009] According to the power tool of this application, the turning assembly includes:

[0010] A hollow, cylindrical first housing, the screwing assembly is rotatably disposed inside the first housing, the first housing and the screwing assembly are coaxially disposed, and an annular first sensing module is fixed on the inner wall of the first housing;

[0011] The torque detection component includes a second sensing module, a torque detection sensor, and a first main control board. The torque detection sensor and the second sensing module are both electrically connected to the first main control board. The first sensing module and the second sensing module are correspondingly configured and used to transmit electrical energy or transmit electrical energy and signals.

[0012] Optionally, the first sensing module includes a first shield and a first sensing coil, and the second sensing module includes a second shield and a second sensing coil. The first sensing coil is wound around the first shield, and the second sensing coil is wound around the second shield. The first sensing coil and the second sensing coil are arranged opposite to each other.

[0013] Optionally, the torque detection component includes a mounting base, which is sleeved on and fixed to the drive shaft. The portion of the drive shaft that passes through the mounting base includes a first shaft segment and a second shaft segment connected in sequence. The second shaft segment is engaged with the mounting base. A gap is formed between the first shaft segment and the inner wall of the mounting base. The torque detection sensor is fixed on the first shaft segment and located within the gap.

[0014] Optionally, the mounting base is provided with an annular mounting groove, the mounting groove opening towards the side opposite to the second shaft segment, and the first main control board is engaged in the mounting groove.

[0015] Optionally, the mounting base is further provided with a snap-fit ​​groove, which is arranged sequentially with the mounting groove along the axial direction of the drive shaft. The opening of the snap-fit ​​groove faces the inner wall of the first housing, and the second sensing module is fixed in the snap-fit ​​groove.

[0016] Optionally, the power tool also includes a housing with a hollow cavity, in which the power assembly, the turning assembly, and the torque detection assembly are all disposed. The cavity is provided with multiple sets of spaced bearings, and the drive shaft passes through the bearings and is spaced apart from the inner wall of the housing.

[0017] Optionally, the drive shaft is provided with at least one positioning shoulder, which abuts against a set of bearings.

[0018] Optionally, the rear end of the working head is sleeved with the transmission shaft, and a first elastic element is sandwiched between the two. The front end of the working head is provided with a first limiting element, and the inner wall of the outer shell is also provided with a second limiting element. The front end of the working head is also sleeved with a second elastic element, and the second elastic element is sandwiched between the first limiting element and the second limiting element.

[0019] The power tool according to this application also includes a housing having a hollow cavity, wherein a second main control board is disposed within the housing, the second main control board being used to connect to a cable assembly, the second main control board being communicatively connected to the first main control board; and / or, the working head and the drive shaft being axially movably connected.

[0020] According to the power tool of this application, the power unit provides rotational power to the tightening assembly. In the tightening assembly, the working head is used to engage the workpiece, which can be a bolt, screw, nut, or screwdriver bit, etc., achieving direct connection with the workpiece to complete the installation operation. The drive shaft is connected to the output shaft of the power unit, which can transmit power to the working head, driving the working head to rotate. The drive shaft is located inside the power tool, its installation position is relatively fixed, and it does not directly contact the workpiece, so it is less affected by external working conditions. By setting the torque detection component on the drive shaft, torque changes can be monitored in real time in a more stable environment, avoiding the influence of external interference on the signal, thereby improving the accuracy and reliability of torque measurement. Attached Figure Description

[0021] Figure 1 The image shown is an exploded view of a power tool according to an embodiment of this application.

[0022] Figure 2 The image shown is a front view of a power tool according to an embodiment of this application.

[0023] Figure 3 As shown Figure 2 Cross-sectional view at EE.

[0024] Figure 4 As shown Figure 3 Enlarged view of point A in the middle.

[0025] Figure 5 The image shown is a perspective view of a power tool according to an embodiment of this application.

[0026] Figure 6 As shown Figure 5 Enlarged view of point B in the middle.

[0027] Figure 7 The image shown is a partial exploded view of a power tool according to an embodiment of this application.

[0028] Figure label:

[0029] Power assembly 10, reduction gear 11, motor 12, screwing assembly 20, working head 21, snap-fit ​​cavity 211, ball bearing 212, drive shaft 22, first shaft section 221, second shaft section 222, positioning shoulder 223, first housing 23, bearing 231, torque detection assembly 30, second sensing module 31, second shielding cover 311, second induction coil 312, torque detection sensor 32, first main control board 33, mounting base 34, mounting groove 341, snap-fit ​​groove 342, first sensing module 40, first shielding cover 41, first induction coil 42, housing 60, second main control board 61, base 62, locking nut 63, end cap 64, first elastic element 71, second elastic element 72, light guide post 80, cable assembly 90. Detailed Implementation

[0030] The technical solutions of 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. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0032] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0033] like Figures 1-4 as well as Figure 7 As shown, the power tool according to an embodiment of this application includes: a power assembly 10, a turning assembly 20, and a torque detection assembly 30.

[0034] like Figure 4 and Figure 7 As shown, specifically, the turning assembly 20 includes a working head 21 and a drive shaft 22 connected along the axial direction. The working head 21 is used to clamp the workpiece. The output shaft of the power assembly 10 is connected to the drive shaft 22 to drive the turning assembly 20 to rotate. The torque detection assembly 30 is fixed on the drive shaft 22 and rotates synchronously with the drive shaft 22.

[0035] The power assembly 10 extends along the spindle axis of the power tool and is coaxial with the drive shaft 22. It may include a motor 12 and a reduction gear 11. The motor 12, the reduction gear 11, and the turning assembly 20 are arranged sequentially along the spindle axis of the power tool. The power tool includes a front end and a rear end. The front end of the power tool refers to the end where the working head 21 is provided. The motor 12 is located at the rear end of the power tool. A battery or power cord may also be provided at the rear end of the power tool. The battery or power cord is connected to the motor 12 to supply power to the motor 12.

[0036] like Figure 1 and Figure 3 As shown, the output shaft of the reduction unit 11 is rigidly connected to the input end of the transmission shaft 22 through a coupling, and the axis of the output shaft of the reduction unit 11 coincides with the axis of the transmission shaft 22.

[0037] In some embodiments, the motor 12 may be a brushless DC motor 12, and the reduction gear 11 may be a planetary gear structure.

[0038] The turning assembly 20 extends axially along the spindle of the power tool and is coaxial with the power assembly 10. The drive shaft 22 extends axially along the spindle of the power tool. The drive shaft 22 and the working head 21 can be movably connected or fixedly connected. When the drive shaft 22 and the working head 21 are fixedly connected, they can be connected by welding, threaded connection, key connection or integral molding to ensure good synchronization between the two during rotation.

[0039] The axially movable connection between the drive shaft 22 and the working head 21 means that the working head 21 and the drive shaft 22 are not rigidly fixed along the axial direction of the power tool's spindle, but are allowed a certain degree of movement and motion. This connection method allows the working head 21 to adaptively adjust its position along the axial direction when facing complex working conditions. For example, when the workpiece surface is uneven, or when resistance is encountered during the turning process causing a slight displacement of the workpiece position, the working head 21 can move flexibly in the axial direction without directly transmitting these external forces to the drive shaft 22 and other components. This effectively avoids component damage or installation errors that may be caused by a rigid connection. This connection method is particularly suitable for scenarios requiring high-precision installation and where the workpiece surface conditions are complex and varied, such as the installation of precision components in electronic equipment and the assembly of aerospace parts.

[0040] In terms of specific structural design, the drive shaft 22 can be movably connected to the working head 21 via an elastic element such as a spring or an elastic sleeve. A compression spring can be placed between the drive shaft 22 and the working head 21, providing axially movable connection space for the working head 21 through the compression and extension of the spring; the elastic sleeve can be sleeved on the outside of the drive shaft 22, and the working head 21 cooperates with the elastic sleeve, utilizing the elastic deformation of the elastic sleeve to achieve axially movable connection.

[0041] like Figure 5 and Figure 6 As shown, the drive shaft 22 can be configured as a cylindrical long shaft or an elliptical cylindrical long shaft; this application does not impose any limitation. The front end of the working head 21 can be provided with a hollow cylindrical snap-fit ​​cavity 211, which is used to snap with a workpiece, such as a bolt, screw, nut, or bit. To achieve a more stable snap-fit ​​effect, the snap-fit ​​cavity 211 can be provided with elastic jaws or movably connected ball bearings 212 for snapping with the workpiece. For example, when snapping with a bit, the elastic jaws will automatically tighten after the bit is inserted into the snap-fit ​​cavity 211, firmly fixing the bit; the movably connected ball bearings 212 can automatically adjust their position during bit insertion, closely fitting the bit surface and preventing the bit from loosening during operation.

[0042] like Figure 4 As shown, the torque detection component 30 is fixed on the drive shaft 22 and rotates synchronously with the drive shaft 22. The torque detection component 30 is used to monitor the torque magnitude during the tightening process in real time to ensure that the installation operation meets the standard requirements. The torque detection component 30 may include a torque detection sensor 32, which can be a strain gauge torque sensor. The strain gauge is attached to the surface of the drive shaft 22. When the drive shaft 22 is subjected to torque and undergoes a small deformation, the resistance value of the strain gauge will change accordingly. The magnitude of the torque can be calculated by detecting the change in resistance value. Alternatively, a magnetoelastic torque sensor can be used, which measures the torque by utilizing the principle that the magnetic permeability of ferromagnetic materials changes when subjected to torque.

[0043] According to the power tool of this application embodiment, the power assembly 10 provides rotational power to the turning assembly 20. In the turning assembly 20, the working head 21 is used to clamp the workpiece, realizing direct connection with the workpiece, thereby completing the installation operation. The drive shaft 22 is connected to the output shaft of the power assembly 10, which can transmit power to the working head 21 and drive the working head 21 to rotate. The drive shaft 22 is located inside the power tool, its installation position is relatively fixed, and it does not directly contact the workpiece, so it is less affected by external working conditions. By setting the torque detection assembly 30 on the drive shaft 22, torque changes can be monitored in real time in a more stable environment, accurately separating the torque signal from interference factors such as axial movable connection and workpiece reaction force, avoiding the influence of external interference on the working head 21 on the signal, thereby improving the accuracy and reliability of torque measurement.

[0044] The working head 21 and the drive shaft 22 are axially movably connected, which can accommodate axial deviations in the workpiece position during installation. This allows the tool to accurately engage the workpiece even under complex working conditions, reducing installation difficulty and improving the flexibility and adaptability of installation operations. Simultaneously, the movable connection between the drive shaft 22 and the working head 21 buffers the impact forces generated when the drive shaft 22 starts, brakes, or experiences sudden load changes, preventing overload of the drive shaft 22 due to a rigid connection. The torque detection component 30 is fixed to the drive shaft 22 and rotates synchronously with it, enabling real-time detection of the torque during drive shaft 22 rotation. During installation, it provides timely feedback on the torque value, facilitating control of the tightening force and preventing damage to the workpiece due to excessive torque or insecure installation due to insufficient torque, thus ensuring installation quality.

[0045] like Figure 1 , Figure 4 as well as Figure 7 As shown, the power tool according to the embodiment of this application includes a screwing assembly 20, which includes a hollow cylindrical first housing 23. The screwing assembly 20 is rotatably disposed in the first housing 23. The first housing 23 and the screwing assembly 20 are coaxially disposed. An annular first sensing module 40 is fixed on the inner wall of the first housing 23.

[0046] The torque detection component 30 includes a second sensing module 31, a torque detection sensor 32, and a first main control board 33. The torque detection sensor 32 and the second sensing module 31 are both electrically connected to the first main control board 33. The first sensing module 40 and the second sensing module 31 are correspondingly configured and used to transmit electrical energy or transmit electrical energy and signals.

[0047] The first housing 23 is a hollow cylindrical shape, which effectively utilizes the internal space to accommodate the screwing components. Furthermore, the cylindrical shape facilitates coaxial assembly with the screwing assembly 20 and the power assembly 10, ensuring the stability of the overall structure. In some embodiments, the first housing 23 also includes a handle connected to the hollow cylindrical structure for easy gripping.

[0048] The first housing 23 extends along the spindle axis of the power tool and is coaxial with the rotation axis of the screwing assembly 20, thereby ensuring that the screwing force of the screwing assembly 20 can be stably transmitted along the spindle direction of the power tool.

[0049] The first housing 23 provides protection and support for the internally rotatable screwing assembly 20, preventing external factors from interfering with the screwing operation. Simultaneously, its internal space provides a stable environment for the rotation of the screwing assembly 20, ensuring smooth screwing. In some embodiments, the end of the first housing 23 facing away from the working head 21 is also provided with a base 62, a locking nut 63, and an end cap 64 connected in sequence.

[0050] Furthermore, the material used to make the first housing 23 can be a high-strength engineering plastic or a lightweight alloy material, such as aluminum alloy, to enhance the strength and heat dissipation performance of the housing.

[0051] The first housing 23 may also be provided with a first heat dissipation hole, so that the first main control board 33 can be dissipated.

[0052] The drive shaft 22 can be a single piece or a multi-segment shaft structure connected by couplings. The drive shaft 22 can be a solid shaft to ensure its structural strength, or it can be a hollow shaft to reduce weight while still meeting structural strength requirements; it can be configured as needed, and this application does not limit it.

[0053] The first sensing module 40 is used to transmit electrical energy or electrical energy and signals to the second sensing module 31. When the two transmit electrical energy, it can provide power for the operation of the first main control board 33. When the two transmit signals, the torque data measured by the torque detection sensor 32 is transmitted to the first main control board 33. After preprocessing by the first main control board 33, the key data can be transmitted to the first sensing module 40 via the second sensing module 31. The first sensing module 40 can transmit the key data to the second main control board 61. The second main control board 61 is electrically connected to the power component 10, thereby intelligently controlling the working state of the power component 10 according to the data transmitted by the first main control board 33, ensuring that the twisting operation is both efficient and precise, and effectively avoiding problems such as workpiece damage or insecure installation caused by excessive or insufficient torque.

[0054] The first sensing module 40 is arranged in a ring shape, extending along the circumferential direction of the inner wall of the first housing 23 to form a complete ring structure. This ensures that it is evenly distributed on the inner wall of the first housing 23, effectively corresponding to the second sensing module 31 at all times, thereby improving the stability and reliability of power and signal transmission.

[0055] The second sensing module 31 is configured correspondingly to the first sensing module 40. The second sensing module 31 is used to receive electrical energy from the first sensing module 40, and in some embodiments, it can also send signals to the first sensing module 40.

[0056] The second sensing module 31 is also ring-shaped and matches the shape of the first sensing module 40, ensuring that the two can correspond effectively and achieve stable energy and signal transmission. The second sensing module 31 extends along the circumferential direction of the transmission shaft 22 to form a complete ring structure, thus being evenly distributed on the outer wall of the transmission shaft 22. The second sensing module 31 can be directly fixed to the transmission shaft 22, or it can be fixed to the transmission shaft 22 by other components.

[0057] For example, the axis of the second sensing module 31 and the axis of the first sensing module 40 coincide with the spindle of the power tool. In space, the first sensing module 40 surrounds the second sensing module 31. The two are arranged facing each other and maintain a certain air gap distance, which can ensure that the magnetic lines of force or signal transmission path is perpendicular and the shortest.

[0058] For example, both the first sensing module 40 and the second sensing module 31 are composed of at least one layer of induction coils wound concentrically, and the number of turns, wire diameter and winding direction of the two are consistent.

[0059] For example, both the first sensing module 40 and the second sensing module 31 include a backup coil in addition to the main coil, so that the backup coil can automatically switch to work when the main coil fails.

[0060] The torque detection sensor 32 is communicatively connected to the first main control board 33 to monitor the torque changes generated by the screwing assembly 20 during operation in real time, and converts the torque signal into an electrical signal, which is then transmitted to the first main control board 33, thereby providing accurate data support for the torque control of the power tool. The communication connection between the torque detection sensor 32 and the first main control board 33 can be via a wire or a wireless connection.

[0061] The torque sensing sensor 32 can be a thin sheet or a ring shape; it can extend radially or axially along the drive shaft 22 to ensure accurate sensing of torque changes. The torque sensing sensor 32 can be a strain gauge torque sensor, detecting torque through changes in the resistance of the strain gauge; or it can be a magnetoelastic torque sensor, utilizing the magnetoelastic effect of ferromagnetic materials to measure torque. Alternatively, a fiber optic torque sensor can be selected, which has advantages such as strong anti-electromagnetic interference capability and high accuracy.

[0062] The first main control board 33 can receive electrical energy from the torque detection sensor 32 and the second sensing module 31. The first main control board 33 can preprocess the data measured by the torque detection sensor 32, such as filtering and calibration. The first main control board 33 is ring-shaped, sleeved on the outside of the transmission shaft 22, and rotates synchronously with the transmission shaft 22.

[0063] According to the embodiments of this application, the first housing 23 of the power tool provides stable support and protection for the turning assembly 20, preventing it from being disturbed by external factors during rotation. The first sensing module 40 fixed to the inner wall of the first housing 23, in conjunction with the second sensing module 31 in the torque detection assembly 30, enables non-contact power transmission, avoiding problems such as wear and poor contact that may exist in traditional wired connections, greatly improving the reliability and service life of the connection. When the first sensing module 40 and the second sensing module 31 are also used to transmit signals, key data during the turning process can be transmitted to the second main control board 61 in a timely manner, facilitating precise monitoring and control of the power tool's working status. This allows for intelligent control of the power tool's working status, ensuring that the turning operation is both efficient and precise, effectively avoiding problems such as workpiece damage or insecure installation caused by excessive or insufficient torque, and improving the overall working performance and usage effect of the power tool.

[0064] like Figure 7 As shown, in some embodiments, the first sensing module 40 includes a first shield 41 and a first sensing coil 42, and the second sensing module 31 includes a second shield 311 and a second sensing coil 312. The first sensing coil 42 is wound around the first shield 41, and the second sensing coil 312 is wound around the second shield 311. The first sensing coil 42 and the second sensing coil 312 are arranged opposite to each other.

[0065] The first shield 41 can guide the magnetic lines of force generated by the first induction coil 42 to concentrate towards the second induction module 31, blocking the electromagnetic field generated by the first induction coil 42 from radiating outward, reducing magnetic leakage, and improving electromagnetic coupling efficiency. The first shield 41 can provide a stable winding frame for the first induction coil 42, thereby ensuring that the first induction coil 42 maintains structural integrity under the vibration or impact of power tools.

[0066] Exemplarily, the first shielding cover 41 is an annular sleeve shape, with its inner wall fitting against the inner wall of the first housing 23, and its outer wall providing a winding surface for the first induction coil 42. It extends continuously along the circumference of the inner wall of the first housing 23, forming a closed ring. Its cross-sectional shape can be rectangular, trapezoidal, or semi-circular, and can be configured as needed; this application does not impose any limitations. In some embodiments, the first shielding cover 41 is made of permalloy. In some embodiments, the first shielding cover 41 may also be made of ferrite alloy.

[0067] The first induction coil 42 generates an alternating magnetic field through alternating current, which can convert electrical energy provided by a battery or power source into magnetic energy, thereby providing an energy source for wireless energy transmission. Alternatively, it can also act as a receiving antenna to capture changes in the magnetic field modulated by the receiving coil and convert them into electrical signals for the second main control board 61 to reproduce control commands or data information, realizing wireless communication with the second induction coil 312. The first induction coil 42 is tightly wound around the outer wall of the first shield 41, extending spirally along the circumference of the first shield 41 to form a spiral ring structure. The axis of the first induction coil 42 coincides with the spindle of the power tool, ensuring coaxial alignment with the second induction coil 312. The turns of the first induction coil 42 maintain a uniform spacing to reduce parasitic capacitance and eddy current losses.

[0068] The second shield 311 can work together with the first shield 41 to form a complete magnetic circuit, enhancing the ability of the second induction coil 312 to capture magnetic lines of force and improving energy transmission efficiency. Simultaneously, it can shield the second induction coil 312 from interference from external stray magnetic fields, ensuring the reliability of signal transmission. Furthermore, it can provide rigid support for the second induction coil 312, ensuring its stable position during the high-speed rotation of the drive shaft 22.

[0069] The second shield 311 is an annular sleeve-shaped structure fitted onto the outer wall of the drive shaft 22, extending continuously along the circumference of the drive shaft 22 to form a closed ring. Its inner wall is directly or indirectly fixed to the outer wall of the drive shaft 22, and its outer wall provides a winding surface for the receiving coil. In addition, the cross-sectional shape of the second shield 311 matches the second induction coil 312 to achieve better magnetic coupling.

[0070] In some embodiments, the second shield 311 is made of permalloy. In some embodiments, the second induction coil 312 may also be made of a ferrite alloy.

[0071] The second induction coil 312 converts the alternating magnetic field into alternating current through electromagnetic induction, powering the first main control board 33 and the torque detection sensor 32. Alternatively, it can act as a transmitting antenna to send data from the first main control board 33 to the first induction coil 42. The second induction coil 312 is tightly wound around the outer wall of the second shield 311, forming a helical ring structure complementary to the first induction coil 42. The inter-turn spacing of the second induction coil 312 is consistent with that of the first induction coil 42 to optimize the electromagnetic coupling coefficient. The second induction coil 312 extends helically along the circumferential direction of the second shield 311, coaxial with the extension direction of the first induction coil 42.

[0072] For example, the second induction coil 312 can use a set of coils to simultaneously realize energy reception and signal modulation; for example, the second induction coil 312 can also use two sets of coils to separately realize energy reception and signal modulation; it can be set as needed, and this application does not limit it.

[0073] According to the embodiments of this application, the power tool, with a first sensing module 40 and a second sensing module 31 arranged opposite to each other, can realize the function of wireless energy transmission, or the dual function of wireless energy transmission and signal interaction. The first shielding cover 41 guides the magnetic lines of force generated by the first induction coil 42 to concentrate towards the second sensing module 31, reducing magnetic leakage and enhancing electromagnetic coupling efficiency, while blocking electromagnetic field radiation that could interfere with other electronic components. The second shielding cover 311 and the first shielding cover 41 work together to form a complete magnetic circuit, enhancing the ability of the second induction coil 312 to capture magnetic lines of force and ensuring stable energy transmission. The first induction coil 42 converts electrical energy into magnetic energy, providing an energy source for wireless power supply, and also acts as a demodulation antenna during signal reception. The second induction coil 312 converts magnetic energy into electrical energy to power the first main control board 33, and transmits key information such as torque data processed by the first main control board 33 back to the first induction coil 42 through load modulation technology. This non-contact energy and signal transmission method avoids the wear and poor contact problems of traditional wired connections, improving system reliability and service life.

[0074] like Figure 4 and Figure 7 As shown, in some embodiments, the torque detection assembly 30 includes a mounting base 34, which is sleeved on and fixed to the drive shaft 22. The portion of the drive shaft 22 that passes through the mounting base 34 includes a first shaft segment 221 and a second shaft segment 222 connected in sequence. The second shaft segment 222 is engaged with the mounting base 34. A gap is formed between the first shaft segment 221 and the inner wall of the mounting base 34. The torque detection sensor 32 is fixed on the first shaft segment 221 and is located in the gap.

[0075] Mounting base 34 is fitted onto drive shaft 22 and provides a rigid mounting base for components such as the first main control board 33 and the first sensing module 40. Mounting base 34 and drive shaft 22 are engaged through a snap-fit ​​mechanism, either integrally formed or welded. Snap-fit ​​engagement is less difficult and less expensive to manufacture, and is therefore preferred.

[0076] Mounting base 34 is a hollow annular sleeve that extends axially along the drive shaft 22, with its axis coinciding with the rotation axis of the drive shaft 22. A rubber buffer layer can be embedded between mounting base 34 and drive shaft 22 to reduce the impact of vibration on detection accuracy.

[0077] For example, the first shaft segment 221 is formed as a cylindrical shaft that extends axially along the drive shaft 22 and is coaxially connected to the second shaft segment 222. The surface of the first shaft segment 221 is smooth to facilitate sensor attachment, and its diameter is smaller than that of the second shaft segment 222 to form a second positioning shoulder 223, thereby enabling axial positioning of the mounting base 34.

[0078] In some embodiments, shallow grooves can be machined on the surface of the first shaft segment 221 to improve the detection sensitivity of the torque detection sensor 32.

[0079] In the above embodiments, the drive shaft 22 may be located on the side outside the mounting base 34 and close to the first shaft segment 221, or it may be provided with a segment with the same diameter as the first shaft segment 221.

[0080] The second shaft segment 222 is formed as a cylindrical shaft with a second engaging portion on its surface. For example, the second engaging portion can be an annular flange. The inner surface of the mounting base 34 is also provided with the second engaging portion. The first engaging portion and the second engaging portion engage with each other to limit the axial movement of the transmission shaft 22 and ensure the alignment accuracy of the first sensing module 40 and the second sensing module 31. Alternatively, the second engaging portion can be an annular groove, with the annular flange engaging in the annular groove.

[0081] The torque detection sensor 32 can sense the deformation stress of the first shaft segment 221, convert the physical quantity of torque into an electrical signal, and collect the torque change during the twisting process in real time. By setting the torque detection sensor 32 on the first shaft segment 221 and in the gap, the influence of other components on the rigid constraint of the torque detection sensor 32 can be avoided, ensuring that the detection accuracy is not affected by mechanical interference.

[0082] After the torque sensor 32 is attached and fixed, adhesive can be filled between the torque sensor 32 and the mounting base 34. The adhesive acts as a buffer layer to resist external impacts and vibrations, preventing the torque sensor 32 from shifting or being damaged due to severe vibrations. At the same time, it isolates moisture, dust and other impurities, preventing them from intruding and affecting the torque sensor 32. After the adhesive cures, it will also tightly connect the torque sensor 32 to the mounting base 34, further fixing the position of the torque sensor 32 and preventing it from loosening due to the inertial force generated by the rotation of the drive shaft 22 during long-term use, ensuring that the torque sensor 32 is always in the optimal detection position.

[0083] According to the embodiments of this application, the power tool has a mounting base 34 sleeved and fixed to the drive shaft 22, providing stable support for the installation of the second sensing module 31 and the first main control board 33. The second shaft segment 222 is engaged with the mounting base 34, further strengthening the connection stability between the mounting base 34 and the drive shaft 22, preventing the mounting base 34 from shifting or loosening when the drive shaft 22 rotates. The gap formed between the first shaft segment 221 and the inner wall of the mounting base 34 provides space for the installation of the torque detection sensor 32, avoiding interference with the normal rotation of the drive shaft 22 caused by the installation of the torque detection sensor 32. The torque detection sensor 32 is fixed to the first shaft segment 221 and within the gap, which can directly and sensitively sense the force changes transmitted by the drive shaft 22, accurately converting the force signal into an electrical signal. Furthermore, this installation method effectively isolates external interference, ensuring the stable operation of the torque detection sensor 32, and achieving accurate detection and reliable transmission of the force signal.

[0084] like Figure 4 and Figure 7 As shown, in some embodiments, the mounting base 34 is provided with an annular mounting groove 341, which opens toward the side opposite to the second shaft segment 222, and the first main control board 33 is fitted inside the mounting groove 341.

[0085] The mounting groove 341 is formed as an annular groove, which forms a complete annular structure around the circumference of the mounting base 34. The mounting groove 341 opens towards the side away from the second shaft section 222, forming a cantilever structure, so that the first main control board 33 maintains a safe distance from the second shaft section 222 after assembly.

[0086] The mounting groove 341 can be milled or cast directly on the mounting base 34 body and be an integral structure with the mounting base 34, or the physical structure defining the mounting groove 341 can be assembled with the mounting base 34 body through snap-fit ​​or threaded connection.

[0087] When the mounting base 34 is made of metal or the physical structure defining the mounting groove 341 is made of metal, the mounting groove 341 can further shield the first main control board 33 from electromagnetic interference, reducing the impact of electromagnetic interference on the first main control board 33.

[0088] In some embodiments, the mounting groove 341 may also be provided with multiple radial steps, thus accommodating first main control boards 33 of different diameters and improving design flexibility. The bottom of the mounting groove 341 may also be provided with mounting holes to facilitate connection with the second induction coil 312.

[0089] The outer diameter of the first main control board 33 matches the inner diameter of the mounting groove 341. The inner diameter of the first main control board 33 can be configured with clearance holes according to the diameter of the drive shaft 22. The plane of the first main control board 33 is perpendicular to the axis of the drive shaft 22. The first main control board 33 is set as a ring, which allows it to surround the drive shaft 22 360°, thereby facilitating the reception of signals from the torque detection sensors 32 from different directions, while also enabling even weight distribution and better dynamic balance.

[0090] According to the embodiments of this application, the power tool mounting base 34 has an annular mounting groove 341 in which the first main control board 33 is secured, making full use of the radial space of the mounting base 34. The first main control board 33, secured within the mounting groove 341, ensures that it does not shift due to vibration or impact during operation of the power tool, and also allows it to receive signals from the torque detection sensor 32 at close range, shortening the signal transmission path, reducing signal attenuation and interference, and improving the real-time performance and accuracy of signal processing. The open design of the mounting groove 341 also facilitates subsequent maintenance and repair, allowing direct replacement or adjustment of the first main control board 33 without disassembling the entire torque detection assembly 30, thus reducing maintenance costs and time.

[0091] like Figure 4 As shown, in some embodiments, the mounting base 34 is also provided with a snap-fit ​​groove 342. The snap-fit ​​groove 342 and the mounting groove 341 are arranged sequentially along the axial direction of the drive shaft 22. The opening of the snap-fit ​​groove 342 faces the inner wall of the first housing 23. The second sensing module 31 is fixed in the snap-fit ​​groove 342.

[0092] The snap-fit ​​groove 342 is an annular groove, forming a complete closed ring along the circumference of the mounting base 34. Its inner diameter matches the outer diameter of the second sensing module 31, thereby ensuring that the second sensing module 31 can be embedded and achieve a stable installation. The axial cross-sectional shape of the snap-fit ​​groove 342 can be rectangular or trapezoidal, which can be set as needed.

[0093] In some embodiments, the inner wall of the snap-fit ​​groove 342 is embedded with an elastic rubber strip or spring sheet. When the second sensing module 31 is installed, these elastic components provide cushioning and preload. This ensures that the second sensing module 31 is securely installed and effectively absorbs vibrations during the operation of the power tool, reducing the adverse effects of vibration on the performance of the second sensing module 31.

[0094] In some embodiments, heat dissipation holes or heat dissipation channels may also be provided on the groove wall of the card slot 342, so that when the second sensing module 31 generates heat during operation, the heat can be dissipated through the heat dissipation holes or heat dissipation channels.

[0095] The second sensing module 31 is embedded in the card slot 342. The second sensing module 31 can be electromagnetic induction type or magnetic resonance type.

[0096] According to the embodiments of this application, the power tool with locking slots 342 and mounting slots 341 are sequentially arranged along the axial direction of the drive shaft 22, resulting in a compact overall layout and improved space utilization. Simultaneously, the sequentially arranged mounting slots 341 and locking slots 342 avoid spatial interference between components, allowing the first main control board 33 and the second sensing module 31 to operate independently and efficiently. The opening of the locking slot 342 faces the inner wall of the first housing 23, enabling the second sensing module 31 to be precisely aligned with the first sensing module 40 fixed to the inner wall of the first housing 23, shortening the distance for wireless power transmission and signal interaction, and enhancing electromagnetic coupling efficiency.

[0097] like Figure 4 and Figure 5 As shown, in some embodiments, the power tool further includes a housing 60 with a hollow cavity. The power assembly 10, the turning assembly 20, and the torque detection assembly 30 are all disposed within the cavity. Multiple sets of spaced bearings 231 are disposed within the cavity, and the drive shaft 22 passes through the bearings 231 and is spaced from the inner wall of the housing 60. The outer ring of the bearing 231 is fixed to the housing 60, or, when the power tool also includes a first housing 23, the outer ring of the bearing 231 is fixed to the inner wall of the first housing 23, which further ensures the coaxiality of the drive shaft 22's rotation and reduces vibration interference.

[0098] like Figure 4 As shown, the cavity is provided with multiple sets of spaced bearings 231, which are distributed along the axial direction of the transmission shaft 22. The inner hole of the bearing 231 is coaxial with the axis of the transmission shaft 22 to ensure that the transmission shaft 22 rotates smoothly. The spacing between adjacent bearings 231 is determined according to the span and load of the transmission shaft 22.

[0099] The drive shaft 22 extends along the axial direction of the cavity of the outer casing 60, and the rotation axis of the drive shaft 22 coincides with the central axis of the cavity of the outer casing 60.

[0100] According to the embodiments of this application, the power tool housing 60 not only provides protection for each component and avoids interference from external factors, but also ensures a compact and orderly internal structure through a reasonable spatial layout. Multiple sets of spaced bearings 231 within the cavity provide stable support for the drive shaft 22, enabling smooth rotation of the drive shaft 22. Simultaneously, they separate the drive shaft 22 from the inner wall of the housing 60, effectively reducing friction and collision between the drive shaft 22 and the housing 60 during rotation. This reduces the additional stress that could interfere with the accurate measurement of the torque detection sensor 32, ensuring that the torque detection component 30 can independently and accurately capture the true torque changes of the drive shaft 22 during tightening.

[0101] like Figure 4 and Figure 7As shown, in some embodiments, the drive shaft 22 is provided with at least one positioning shoulder 223, which abuts against a set of bearings 231.

[0102] The positioning shoulder 223 is typically an annular protrusion that surrounds the outer circumference of the drive shaft 22, forming a stepped shape with the main body of the drive shaft 22. The bearing 231 provides stable support for the drive shaft 22, enabling it to rotate smoothly, reducing friction and vibration during rotation, and ensuring stable power transmission.

[0103] According to the power tool of this application embodiment, the positioning shoulder 223 abuts against the bearing 231, providing a clear axial positioning reference for the drive shaft 22, preventing axial movement during rotation, and ensuring the accuracy of power transmission. Simultaneously, this structure prevents the drive shaft 22 from interfering with wireless energy and signal transmission due to axial displacement, ensuring stable electromagnetic coupling between the first sensing module 40 and the second sensing module 31.

[0104] like Figure 3 and Figure 4 As shown, in some embodiments, the rear end of the working head 21 is sleeved with the drive shaft 22, and a first elastic member 71 is sandwiched between the two. The front end of the working head 21 is provided with a first limiting member, and the inner wall of the outer shell 60 is also provided with a second limiting member. The front end of the working head 21 is also sleeved with a second elastic member 72, which is sandwiched between the first limiting member and the second limiting member.

[0105] According to the power tool of the present application embodiment, the first elastic member 71 enables the working head 21 and the drive shaft 22 to have a buffer adjustment capability. When facing different working conditions, it can effectively absorb and alleviate the impact force and vibration generated during the turning process, and reduce rigid damage to the drive shaft 22 and the working head 21. The first limiting member at the front end of the working head 21 and the second limiting member on the inner wall of the housing 60, together with the clamped second elastic member 72, jointly limit the axial movement range of the working head 21, ensuring that the working head 21 can be movably connected within a reasonable range. This ensures that the working head 21 can adaptively adjust its position according to the surface condition of the workpiece, and avoids its excessive movement from affecting the normal operation of the tool.

[0106] like Figure 1 and Figure 3 As shown, the power tool according to the embodiment of this application also includes a housing 60 with a hollow cavity, and a second main control board 61 is also provided inside the housing 60. The second main control board 61 is used to connect with the cable assembly 90 and is communicatively connected with the first main control board 33.

[0107] The housing 60 may also be provided with an array of second heat dissipation holes, which are connected to the first heat dissipation holes, thereby dissipating heat for the components inside the housing 60 and the first main control board 33.

[0108] According to the embodiments of this application, the second main control board 61 and the first main control board 33 are connected through the first sensing module 40 and the second sensing module 31, so that the two can cooperate and complement each other. The first main control board 33 focuses on the real-time processing and analysis of the data of the torque detection component 30, while the second main control board 61, based on the information transmitted by the first main control board 33 and combined with the external commands given by the user, performs overall regulation of the overall working state of the power tool, accurately controls the output of the power component 10, and ensures the efficient operation of the turning component 20.

[0109] In addition, compared to not providing the first housing 23 and directly placing the first sensing module 40 on the outer casing 60, the structure of this embodiment has the following advantages:

[0110] (1) If the first sensing module is directly fixed to the outer shell 60 without the first housing 23, the outer shell 60 needs to be assembled as a whole. Compared with the first housing 23, it has a larger assembly error and structural stress, and is more prone to displacement. It may also be subjected to complex loads such as external impact and gripping force, which may cause the first sensing module 40 and the second sensing module 31 to be misaligned. However, in the power tool of this application embodiment, the first housing 23 has a smaller structure and is coaxially arranged with the screwing assembly 20. The first sensing module 40 fixed on its inner wall can maintain strict coaxial alignment with the second sensing module 31 on the transmission shaft 22.

[0111] (2) Since the first housing 23 is small in size, it can also be made of metal to form an independent electromagnetic shielding space, while the outer shell 60 can be made of plastic. In this way, better control effect can be maintained without increasing cost. At the same time, the first housing 23 can bring the first sensing module 40 and the second sensing module 31 closer together, resulting in a shorter signal transmission path and less attenuation.

[0112] (3) The first housing 23 is an independent component that can be assembled or disassembled as a whole with the screwing assembly 20. The first sensing module 40, the second sensing module 31, the torque detection sensor 32 and other components can be maintained without disassembling the outer shell 60. For example, when replacing the first sensing module 40, only the end cap 64 or the locking nut 63 of the first housing 23 needs to be removed, without damaging the overall structure of the outer shell 60, thus reducing maintenance costs.

[0113] According to the embodiments of this application, the power tool housing 60 further includes a light panel and a light guide post 80. The light guide post 80 passes through the housing 60 and is used to guide the light emitted from the light panel to the front end of the working head 21 to illuminate the workpiece mounting area. The light guide post 80 is either a cylindrical light guide post 80 or an L-shaped light guide post 80. The cylindrical light guide post 80 extends linearly along the axial direction of the housing 60 and has a circular or rectangular cross-section; the L-shaped light guide post 80 includes a vertical section and a horizontal section to achieve a change in the direction of the light.

[0114] In some embodiments, the lamp board is electrically connected to the second main control board 61.

[0115] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms such as “a,” “an,” etc., used herein may also refer to the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0116] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0117] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A power tool characterized by comprising: include: Power components; A screwing assembly, comprising a working head and a drive shaft connected along the axial direction, the working head being used to clamp a workpiece, and the output shaft of a power assembly being connected to the drive shaft to drive the screwing assembly to rotate; A torque detection component is fixed on the drive shaft and rotates synchronously with the drive shaft.

2. The power tool of claim 1, wherein, The screwing assembly includes: A hollow, cylindrical first housing, the screwing assembly is rotatably disposed inside the first housing, the first housing and the screwing assembly are coaxially disposed, and an annular first sensing module is fixed on the inner wall of the first housing; The torque detection component includes a second sensing module, a torque detection sensor, and a first main control board. The torque detection sensor and the second sensing module are both electrically connected to the first main control board. The first sensing module and the second sensing module are correspondingly configured and used to transmit electrical energy or transmit electrical energy and signals.

3. The power tool according to claim 2, characterized in that, The first sensing module includes a first shield and a first sensing coil, and the second sensing module includes a second shield and a second sensing coil. The first sensing coil is wound around the first shield, and the second sensing coil is wound around the second shield. The first sensing coil and the second sensing coil are arranged opposite to each other.

4. The power tool according to claim 2, characterized in that, The torque detection component includes a mounting base, which is sleeved on and fixed to the drive shaft. The portion of the drive shaft that passes through the mounting base includes a first shaft segment and a second shaft segment connected in sequence. The second shaft segment is engaged with the mounting base. A gap is formed between the first shaft segment and the inner wall of the mounting base. The torque detection sensor is fixed on the first shaft segment and located within the gap.

5. The power tool according to claim 4, characterized in that, The mounting base is provided with an annular mounting groove, which opens to the side facing away from the second shaft segment, and the first main control board is locked inside the mounting groove.

6. The power tool according to claim 5, characterized in that, The mounting base is also provided with a snap-fit ​​groove, which is arranged sequentially with the mounting groove along the axial direction of the drive shaft. The opening of the snap-fit ​​groove faces the inner wall of the first housing, and the second sensing module is fixed in the snap-fit ​​groove.

7. The power tool according to claim 5, characterized in that, It also includes a housing with a hollow cavity, in which the power component, the screwing component and the torque detection component are all disposed. Multiple sets of spaced bearings are disposed in the cavity, and the drive shaft passes through the bearings and is spaced apart from the inner wall of the housing.

8. The power tool according to claim 7, characterized in that, The drive shaft is provided with at least one positioning shoulder, which abuts against a set of bearings.

9. The power tool according to claim 7, characterized in that, The rear end of the working head is sleeved with the transmission shaft, and a first elastic element is sandwiched between the two. The front end of the working head is provided with a first limiting element, and the inner wall of the outer shell is also provided with a second limiting element. The front end of the working head is also sleeved with a second elastic element, which is sandwiched between the first limiting element and the second limiting element.

10. The power tool according to any one of claims 2-9, characterized in that, It also includes a housing with a hollow cavity, within which a second main control board is disposed, the second main control board being used to connect to the cable assembly and communicating with the first main control board; and / or, the working head and the drive shaft being axially movably connected.

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