A handheld slip-resistant drill and method of use

Abstract

The application belongs to the technical field of electric drilling tools, and discloses a handheld anti-skid drilling tool and a use method thereof, which comprises a handheld part, a battery compartment, a connecting assembly and a clamping part. The clamping part comprises a connecting hole for mounting a drill bit and a claw disc for clamping the drill bit. A connecting cavity in communication with the connecting hole is arranged inside the clamping part. A detection assembly for detecting the working state of the drill bit and a protection assembly for limiting abnormal rotation of the drill bit are arranged in the connecting cavity. The connecting state between the drill bit and the clamping part is detected by the detection assembly, and the abnormal rotation of the drill bit is limited by the protection assembly, so that the stability of the installed drill bit is improved, the possibility of relative sliding of the drill bit during the working process is reduced, and the safety and drilling precision during the drilling process are improved.

Description

Technical Field

[0001] This invention belongs to the field of electric drilling technology, specifically a handheld anti-slip drilling tool and its usage method. Background Technology

[0002] In actual use, the drill bit of existing handheld electric drills is usually fixed by a clamping mechanism. During continuous drilling operations, due to the resistance generated by the material being processed and the influence of periodic impact loads, wear easily occurs between the clamping mechanism and the drill bit, causing the clamping force to gradually decrease, which in turn leads to relative sliding between the drill bit and the clamping mechanism.

[0003] Patent application CN202222209232.0 discloses an auxiliary tool for electric drill fixtures, more specifically, an auxiliary electric drill positioning device. It includes two parallel chassis, a first chassis and a second chassis. The first chassis is a hollow chassis with several positioning rods fixed at equal intervals on it, and also includes a positioning rod limiter fixed at the end of the positioning rod. A compression spring is wound around the outside of the positioning rod. The drill chuck is located between the first chassis and the second chassis. This solution forms a stable guiding and damping mechanism through the first chassis, the second chassis, the positioning rods, and the compression spring wound around the positioning rods. The drill bit is fixed inside the drill chuck, located within this guiding and damping mechanism, and forms a force-bearing unit with the guiding and damping mechanism, effectively dispersing impact force, reducing the impact on the drill bit, and ensuring drill bit stability.

[0004] When the drill bit slips relative to the other, it will not only reduce drilling efficiency, but also cause the center of rotation of the drill bit to shift, resulting in a decrease in drilling accuracy. At the same time, abnormal rotation between the drill bit and the clamping mechanism may also generate impact loads, which may damage the clamping structure or even cause the drill bit to come loose, posing a safety hazard to the operator.

[0005] In addition, existing drilling tools usually rely solely on mechanical clamping structures to maintain the connection of the drill bit, making it impossible to judge the connection status between the drill bit and the clamping mechanism in real time during the operation of the drilling tool. When the drill bit becomes slightly loose, it is difficult for the user to detect and adjust it in time.

[0006] Therefore, in order to solve the above-mentioned technical problems, the present invention proposes a handheld anti-slip drill and its method of use. Summary of the Invention

[0007] The present invention aims to solve the problems of unstable drill bit clamping, relative slippage between the drill bit and the clamping mechanism, and reduced drilling accuracy that occur when existing handheld drills are used for a long time due to the working resistance of the drill bit and the wear of the clamping components.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a handheld anti-slip drill bit, comprising a handheld part, wherein a battery compartment and a connecting assembly are respectively connected to both ends of the handheld part along the length direction, and a clamping part for restricting the drill bit is connected to one end of the connecting assembly; The clamping part includes a drive shaft, one end of which is connected to a connecting assembly in the axial direction. The end of the drive shaft away from the connecting assembly is connected to a limiting shell for connection protection. A connecting hole for fixing the drill bit is opened on the side of the limiting shell away from the drive shaft. A claw plate is connected in the connecting hole. The limiting shell has a connecting cavity, and a detection component for identifying the working status of the drill bit is connected in the connecting cavity. The connecting cavity is coaxial with and connected to the connecting hole. A protective component is provided on the side of the detection component away from the connecting hole, and the protective component is located in the connecting cavity.

[0009] Preferably, the detection component includes a support ring, the outer circumference of which is fixedly connected to the cavity wall of the connecting cavity, and at least three abutting parts on the inner ring of the support ring. Each abutting part is connected to an electric drive rod at one end near the support ring, and the electric drive rod is fixedly connected to the support ring.

[0010] Preferably, the contact part includes a support plate, one end of which is connected to an electric drive rod, an elastic rod is connected to the end of the support plate away from the electric drive rod, a movable plate is connected to the end of the elastic rod away from the support plate, and a contact plate that abuts against the drill bit is movably provided at the end of the movable plate away from the elastic rod.

[0011] Preferably, the protective assembly includes a connecting plate, an annular torsion spring groove is formed on the inner ring of the connecting plate, a rotating part is provided in the torsion spring groove, and an irregular hole for limiting the drill bit is formed through the rotating part.

[0012] Preferably, the handheld part includes a handle, and a push switch for controlling the operation of the clamping part is connected to the handle.

[0013] Preferably, the connecting assembly includes a protective shell, an adjusting ring is rotatably provided at one end of the protective shell near the clamping part, a rotating motor that provides power is connected inside the protective shell, and the drive shaft is connected to the rotating motor.

[0014] Preferably, the axes of the claw disk, the detection component, and the protective component are all on the same straight line.

[0015] Preferably, an elastic damping mechanism for suppressing the contact plate is provided between the contact plate and the movable plate.

[0016] This invention also discloses a method of use, which utilizes a handheld anti-slip drill bit, comprising the following steps: S1. Install the battery into the battery compartment, insert the drill bit to be used into the connection hole of the clamping part, so that the drill bit passes through the claw plate, the detection component and the protective component in sequence, and control the clamping part to clamp and fix the outer periphery of the drill bit by the claw plate. S2. After the drill bit is initially clamped, the detection component is activated. The electric drive rod drives the contact part to move towards the drill bit, so that the contact plate abuts against the outer periphery of the drill bit. The connection status between the drill bit and the clamping part is obtained through the detection component. S3. The rotating motor inside the connecting assembly is started by pressing the switch. The rotating motor drives the clamping part and the drill bit to rotate synchronously through the drive shaft to perform drilling operation on the position to be processed. S4. During the operation of the drill bit, when the detection component detects relative rotation between the drill bit and the clamping part, it adjusts the clamping state of the claw disc on the drill bit to restore the drill bit to a stable connection state. S5. When an abnormal rotational tendency occurs between the drill bit and the clamping part, the tail of the drill bit drives the rotating part of the protective component to rotate relative to the connecting disc, and the abnormal rotation amplitude of the drill bit is reduced by the elastic limiting effect in the torsion spring groove, so as to protect the clamping part and the detection component.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting a detection component inside the clamping part, the drill bit can form a contact fit with the detection component after installation. During the operation of the drill bit, the detection component detects whether there is relative movement between the drill bit and the clamping part, thereby enabling timely judgment of the connection status between the drill bit and the jaw disc, and improving the accuracy of the judgment of the drill bit's working status.

[0018] 2. By setting multiple contact parts and using an electric drive rod to adjust the contact distance between the contact parts and the drill bit, the detection component can be adapted to drill bits of different sizes and specifications. At the same time, the multiple contact parts provide multi-point support for the drill bit, improving the coaxial stability of the drill bit after installation and reducing the deviation that occurs during the rotation of the drill bit.

[0019] 3. By setting up a protective component, the drill bit tail can form a limiting connection with the protective component. When abnormal relative rotation occurs between the drill bit and the clamping part, the protective component can buffer and limit the rotation of the drill bit, reducing the risk of damage to the claw disc and detection components caused by abnormal rotation of the drill bit, and improving the safety of the drilling tool during use.

[0020] 4. By combining the detection and protection components, the drill bit clamping status can be detected while the working status of the drill bit is restricted, so that the drill bit can maintain stable rotation and improve the machining accuracy during the drilling process. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the overall device of the present invention; Figure 2 This is a schematic diagram of the internal connection structure of the connection component of the present invention; Figure 3 This is a three-dimensional structural diagram of the clamping part of the present invention; Figure 4 This is a cross-sectional structural diagram of the clamping part of the present invention; Figure 5 This is a three-dimensional structural diagram of the detection component of the present invention; Figure 6 This is a schematic cross-sectional view of the contact portion of the present invention; Figure 7 This is a three-dimensional structural diagram of the protective component of the present invention; Figure 8 This is a cross-sectional structural diagram of the protective component of the present invention.

[0022] Figure Descriptions: 1. Handheld part; 101. Grip; 102. Press switch; 2. Battery compartment; 3. Connecting assembly; 301. Protective shell; 302. Adjusting ring; 303. Rotating motor; 4. Clamping part; 401. Drive shaft; 402. Limiting shell; 4021. Connecting cavity; 403. Connecting hole; 5. Claw plate; 6. Detection assembly; 601. Support ring; 602. Contact part; 6021. Bearing plate; 6022. Movable plate; 6023. Contact plate; 6024. Elastic rod; 603. Electric drive rod; 7. Protective assembly; 701. Connecting plate; 702. Rotating part; 703. Irregular hole; 704. Torsion spring groove. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 - Figure 2 As shown, the present invention discloses a handheld anti-slip drill bit, including a handheld part 1 for a user to hold and grip. The two ends of the handheld part 1 along the length direction are respectively connected to a battery compartment 2 for installing a mobile power supply and a connecting component 3. One end of the connecting component 3 is connected to a clamping part 4 for restricting the drill bit. The position of the clamping part 4 is constrained and restricted by the connecting component 3, which can improve the anti-collision performance of the drill bit during use.

[0025] like Figure 3 - Figure 4As shown, the clamping part 4 includes a drive shaft 401 for increasing rotational force. One end of the drive shaft 401 along the axial direction is connected to the connecting assembly 3, thereby using the connecting assembly 3 to drive the drive shaft 401 to rotate, providing rotational driving force for the drill bit. The end of the drive shaft 401 away from the connecting assembly 3 is connected to a limiting shell 402 for connection protection. The limiting shell 402 has a connecting hole 403 for fixing the drill bit on the side away from the drive shaft 401. A claw disk 5 for clamping and fixing the drill bit is connected in the connecting hole 403. In use, the drill bit to be installed is inserted into the connecting hole 403, and then the claw disk 5 is controlled to clamp and restrict the outer circumference of the drill bit to maintain the installation stability of the drill bit.

[0026] It should be noted that, in this invention, the number of jaws on the jaw disc 5 is preferably three, and the three jaws are evenly distributed on the jaw disc 5. The distance between the jaws on the jaw disc 5 can be adjusted to accommodate drill bits of different diameters.

[0027] Meanwhile, during the drilling process, wear occurs between the claw disc 5 and the drill bit due to resistance, leading to relative sliding between them and affecting drilling efficiency. This necessitates the inclusion of a connecting cavity 4021 within the housing 402 to provide space for component connection. A detection component 6 for identifying the drill bit's working state is connected within the connecting cavity 4021. Specifically, the detection component 6 contacts the drill bit, identifying its working state within the clamping part 4, thereby determining the connection state between the claw disc 5 and the drill bit. Furthermore, the connecting cavity 4021 is coaxial with the connecting hole 403. The connection ensures that after the drill bit passes through the connecting hole 403 and enters the connecting cavity 4021, it can be clamped by the detection component 6. At the same time, when the detection component 6 and the claw plate 5 clamp the drill bit, they will not interfere with the rotation axis of the drill bit. The detection component 6 is provided with a protective component 7 on the side away from the connecting hole 403 to protect the working condition of the drill bit. The protective component 7 is located in the connecting cavity 4021. Thus, when the drill bit is connected and restricted, the tail of the drill bit passes through the connecting hole 403 and the connecting cavity 4021 in sequence and is clamped with the protective component 7, thereby ensuring the safety of the drill bit during use and the drilling accuracy.

[0028] Simultaneously, while using the detection component 6 and the protection component 7 to identify the connection status between the drill bit and the claw disk 5, the drill bit is simultaneously clamped at three points along the axial direction, ensuring that the axial position of the drill bit is stable during the rotation of the clamping part 4, and that the drill bit has high drilling accuracy.

[0029] like Figure 5 - Figure 6As shown, further, in order to ensure the stable identification of the connection state between the drill bit and the claw disk 5 by the detection component 6, the detection component 6 includes a support ring 601 for providing a connection and fixing carrier. The outer circumference of the support ring 601 is fixedly connected to the cavity wall of the connection cavity 4021. At least three contact parts 602 for contacting the outer diameter of the drill bit are abutted on the inner ring of the support ring 601. In this invention, the number of contact parts 602 is preferably three, and the three contact parts 602 are evenly distributed on the support ring 601. The end of each contact part 602 near the support ring 601 is connected to an electric drive rod 603 for controlling the distance between the contact parts 602. The body of the electric drive rod 603 is fixedly connected to the support ring 601. According to the different drill bit diameters, the extension and retraction length of the movable rod in the electric drive rod 603 is adjusted to realize the adjustment of the distance between the contact part 602 and the support ring 601, ensuring the contact stability between the contact part 602 and the drill bit, and improving the detection accuracy of the detection component 6.

[0030] Furthermore, to ensure stable detection performance of the drill bit by the detection component 6 and to avoid interfering with the rotation of the drill bit, the contact part 602 includes a support plate 6021 for connection and fixation. One end of the support plate 6021 is connected to the electric drive rod 603. The electric drive rod 603 drives the support plate 6021 to move relative to the support ring 601. Simultaneously, the support plate 6021 is in contact with the support ring 601, ensuring that the movement of the support plate 6021 does not interfere with the movement of the support ring 601. Additionally, the end of the support plate 6021 away from the electric drive rod 603 is connected to a device for maintaining the contact force with the drill bit. The elastic rod 6024 has a movable plate 6022 connected to one end away from the bearing plate 6021. The movable plate 6022 has a contact plate 6023 that movably contacts the drill bit at one end away from the elastic rod 6024. When the electric drive rod 603 moves the bearing plate 6021 closer to the drill bit, the contact plate 6023 first contacts the drill bit. As the length of the electric drive rod 603 continues to extend, the length of the elastic rod 6024 contracts. When the elastic rod 6024 is compressed to a set threshold, the electric drive rod 603 stops working, so that the contact force between the contact plate 6023 and the drill bit can meet the clamping requirements of the drill bit.

[0031] The contact plate 6023 and the claw plate 5 are both equipped with anti-slip pads at the end near the drill bit to improve the fixing force on the drill bit and ensure the stable rotation of the drill bit.

[0032] When the contact plate 6023 comes into contact with the drill bit, the center lines of the contact plate 6023 and the movable plate 6022 are on the same straight line, that is, there is no relative sliding between the contact plate 6023 and the movable plate 6022, ensuring the stable detection function of the detection component 6.

[0033] When the drill bit is working, the drill bit and the clamping part 4 rotate synchronously. That is, the drill bit and the clamping part 4 will not rotate relative to each other during normal use. When there is no relative displacement between the contact plate 6023 and the movable plate 6022, it means that the drill bit and the clamping part 4 are in normal working condition and no adjustment is required. When there is relative displacement between the contact plate 6023 and the movable plate 6022, it means that the drill bit and the clamping part 4 rotate relative to each other during operation. This means that the clamping force of the claw disk 5 on the drill bit decreases, affecting the drilling effect and drilling accuracy of the drill bit. This reminds the user to observe the working status of the drill bit and replace it in time.

[0034] like Figure 7 - Figure 8 As shown, further, to prevent excessive rotation between the drill bit and the clamping part 4 from damaging the detection component 6, the protective component 7 includes a connecting plate 701 for mounting. The connecting plate 701 is fixedly connected to the end of the connecting cavity 4021 away from the connecting hole 403. An annular torsion spring groove 704 is provided on the inner ring of the connecting plate 701. A rotating part 702 for suppressing the rotation of the drill bit and the clamping part 4 is provided in the torsion spring groove 704. A special-shaped hole 703 for limiting the drill bit is provided through the rotating part 702. The tail of the drill bit is engaged in the special-shaped hole 703. When relative sliding occurs between the drill bit and the clamping part 4, the rotating part 702 and the torsion spring groove 704 rotate relative to each other. At the same time, the torsion spring in the torsion spring groove 704 is compressed, suppressing the rotation of the rotating part 702. This achieves the suppression of the rotation of the drill bit and avoids the relative rotation between the drill bit and the clamping part 4 from damaging the claw plate 5 and the detection component 6, affecting their subsequent use.

[0035] Furthermore, the hand-held part 1 includes a handle 101, and a push switch 102 for controlling the operation of the clamping part 4 is connected to the handle 101. The push switch 102 controls the rotation start and stop of the rotating motor 303, thereby completing the rotation control of the clamping part 4 and the drill bit.

[0036] Furthermore, the connecting assembly 3 includes a protective shell 301 for protection. The protective shell 301 has an adjustment ring 302 rotatably provided at one end near the clamping part 4 for adjusting the rotation speed of the clamping part 4 and the drill bit. A rotating motor 303 that provides power is connected inside the protective shell 301. The drive shaft 401 is connected to the rotating motor 303. The rotating motor 303 drives the drive shaft 401 to rotate, thereby realizing the synchronous rotation of the clamping part 4 and the drill bit.

[0037] Furthermore, the axes of the claw disc 5, the detection component 6, and the protective component 7 are all on the same straight line. By using a three-point clamping method, the connection angle of the drill bit on the clamping part 4 is ensured to be stable, thereby ensuring that the rotation angle of the drill bit is stable when it rotates and improving the accuracy of the drill bit when drilling.

[0038] Furthermore, an elastic damper is provided between the contact plate 6023 and the movable plate 6022 to suppress the contact plate 6023. When the drill bit rotates relative to the clamping part 4, that is, when the drill bit slides relative to the claw disk 5, the drill bit causes the contact plate 6023 to slide relative to the movable plate 6022. At the same time, the drill bit also causes the rotating part 702 to rotate relative to the torsion spring groove 704. When the contact plate 6023 slides relative to the movable plate 6022, the elastic damper is compressed, suppressing the sliding of the contact plate 6023 and thus suppressing the rotation of the drill bit.

[0039] Specifically, the drill bit is initially clamped and fixed by the claw disk 5, and the working status of the drill bit is monitored in real time by the detection component 6. At the same time, the abnormal movement of the drill bit is restricted by the protection component 7, so that the drill bit can maintain a stable axial position and circumferential connection during high-speed rotation. Therefore, it can effectively reduce the problem of drill bit loosening due to clamping wear during long-term use of traditional drilling tools and improve the reliability of drilling tool operation.

[0040] In one embodiment, an intelligent controller is integrated within the protective shell 301 or the grip 101. The intelligent controller is electrically connected to the battery compartment 2, the push-button switch 102, the adjustment ring 302, the rotary motor 303, the electric drive rod 603, the status acquisition unit, the warning unit, and the storage unit. The status acquisition unit, the warning unit, and the storage unit can all be integrated into the existing space of the protective shell 301, the grip 101, the battery compartment 2, the detection component 6, or the connecting cavity 4021, without altering the existing space. Figure 1 - Figure 8 The external structure of the drill bit is shown, and no additional reference numerals are provided.

[0041] The intelligent controller preferably uses a microcontroller, digital signal processor, or control chip with equivalent computing power to perform sensor signal acquisition, threshold comparison, state machine switching, closed-loop regulation, and safe shutdown.

[0042] The status acquisition unit includes one or more of the following sensors, specifically: A current detector is installed in the power supply circuit between the battery compartment 2 and the rotating motor 303 to collect the motor's operating current.

[0043] A speed detector is installed at the output end of the rotating motor 303 or near the drive shaft 401 to collect the speed of the drive shaft 401.

[0044] A torque detector is installed on the drive shaft 401, or the output torque is estimated based on the motor current, speed and motor calibration parameters.

[0045] A displacement detector is installed between the contact plate 6023 and the movable plate 6022 to collect the circumferential relative displacement of the contact plate 6023 relative to the movable plate 6022.

[0046] Pressure detectors installed at the electric drive rod 603, the bearing plate 6021, or the contact plate 6023 are used to collect the radial contact force applied to the drill bit by each contact part 602.

[0047] The vibration detector installed in the protective shell 301 is used to collect the vibration amplitude or root mean square value of the drill bit.

[0048] The sensor can be any one of the following: Hall sensor, photoelectric sensor, magnetoelectric sensor, strain gauge sensor, piezoresistive sensor, accelerometer, or thermal element.

[0049] The intelligent controller performs calibration operations when the drill bit leaves the factory or is used for the first time. The calibration operations include: recording the zero-point displacement when the electric drive rod 603 is in the zero position; establishing the correspondence between the extension amount of the electric drive rod 603 and the drill bit diameter using multiple standard round rods of known diameters; establishing the correspondence between the driving amount, pressure detection value and radial resistance force of the electric drive rod 603 using standard force measuring components; and recording the no-load speed, no-load current and reference vibration value corresponding to different adjustment ring 302 positions when the rotating motor 303 is running under no-load.

[0050] When calculating the drill bit diameter from the extension of the three contact parts 602, the average value of the three extension conversion results can be taken. When the maximum deviation between the pressure detection values ​​of the three contact parts 602 exceeds 10%-20% of the average value, the intelligent controller performs differential adjustment on the corresponding electric drive rod 603 to make the drill bit axis approach the common axis of the claw disk 5, the detection component 6 and the protection component 7.

[0051] It should be noted that the above values ​​are exemplary calibration ranges and can be set according to the drill bit specifications and actuator parameters.

[0052] In the drill bit identification and pre-clamping state, the intelligent controller controls the three electric drive rods 603 to extend synchronously until the contact plates 6023 are in contact with the outer periphery of the drill bit. Simultaneously, an exemplary pre-clamping range is set at a radial contact force of 5N-60N for each contact part 602 or a total radial contact force of 15N-180N for the three contact parts 602. The initial target contact force is selected based on the drill bit diameter, drill bit shank material, and target rotation speed. The intelligent controller uses the deviation between the pressure detection value and the target contact force as feedback, controlling the electric drive rods 603 to gradually adjust in displacement steps of 0.02mm-0.20mm or in force increments of 5%-15% of the target contact force. After each adjustment, a 20ms-100ms pause is maintained to allow structural stability until the pressure deviation enters the set tolerance range. To prevent deformation of the drill bit shank under pressure, the controller simultaneously sets at least one of the following limits: maximum extension amount, maximum contact force, and maximum number of adjustments.

[0053] In the low-speed testing state, the intelligent controller makes the rotating motor 303 run at the rated speed and collects the speed decrease rate, current increase rate, estimated torque, root mean square value of vibration and change in resistance force during the testing period.

[0054] The intelligent controller compares the above parameters with the pre-stored rule ranges, and can classify the current working condition into low resistance, medium resistance or high resistance conditions. It then determines the target rotation speed, allowable torque range, slippage judgment threshold and upper limit of resistance under normal drilling conditions. The rule ranges can be obtained by test drilling and calibration on representative materials such as wood, plastic, thin-walled metal, concrete or stone. Thus, it can adapt to different drilling materials and drill bit specifications without relying on network computing.

[0055] Under normal drilling conditions, the intelligent controller drives the rotary motor 303 according to the target rotation speed corresponding to the adjustment ring 302, and cyclically samples the rotation speed, current, vibration, contact force, and relative displacement of the contact plate 6023. The sampling period can be set to 1ms-20ms. For vibration signals, a sliding time window of 20ms-200ms can be used to calculate the root mean square value. In order to reduce misjudgment caused by instantaneous impact, the intelligent controller only switches to slip correction state or safety protection state when the detected quantity continuously exceeds the corresponding threshold for a preset duration, or when at least two types of detected quantities simultaneously meet the abnormal conditions.

[0056] Drill bit slippage can be determined based on one or more of the following conditions: The circumferential displacement of the contact plate 6023 relative to the movable plate 6022 reaches 0.10mm-0.50mm and lasts for 20ms-100ms; the relative rotation angle obtained by displacement conversion reaches 0.5°-3°; the difference between the optional drill bit speed detection value and the drive shaft 401 speed detection value reaches 3%-10% of the drive shaft speed; the resistance force decreases by more than 10%-30% when the output command remains basically unchanged; or the rotating part 702 in the torsion spring groove 704 undergoes continuous reciprocating deflection per unit time.

[0057] Preferably, the intelligent controller uses relative displacement or speed difference as the main criterion and at least one of current increase, speed decrease or resistance decrease as the confirmation criterion, thereby distinguishing between drill bit slippage and normal transient load changes generated when the drill bit cuts into the material.

[0058] When the slippage judgment condition is met, the intelligent controller enters the slippage correction state, first reducing the target speed of the rotating motor 303, and then synchronously or differentially controlling the electric drive rod 603 to increase the resistance force.

[0059] In each correction cycle, the extension of the electric drive rod 603 increases by 0.02mm-0.20mm, or the target resistance increases by 5%-20% of the current target value; after holding for 20ms-100ms, the relative displacement, speed difference, and resistance are reassessed.

[0060] When the abnormal value recovers to below the release threshold, the controller gradually restores the target speed to avoid sudden speed changes that could cause slippage again. If slippage is not eliminated after 2-5 consecutive correction cycles, or if the resistance or extension has reached the safety limit, the controller stops rotating the motor 303 and outputs a warning message through the warning unit indicating that the drill bit needs to be re-clamped or replaced.

[0061] In terms of overload or stall protection, the intelligent controller uses the reference current and reference speed obtained during the no-load phase of the same gear as a reference. When the working current reaches 1.3 to 2.0 times the reference current, and the speed drops by 30% to 70% relative to the target speed, and this continues for 50ms to 300ms, it is determined to be overload or stall. The controller cuts off or significantly reduces the drive power of the rotating motor 303 within 20ms to 100ms and maintains the clamping state of the electric drive rod 603 to prevent the drill bit from being thrown out.

[0062] After the user releases the push switch 102, the controller allows low-speed jogging or short-term reverse to release the stuck drill. The duration of the short-term reverse is preferably 0.1s-0.5s. This control can reduce the risk of reverse torque impact, motor overcurrent and user wrist injury caused by stalling, only when the contact force is within a safe range.

[0063] In terms of vibration anomaly and eccentricity identification, the intelligent controller compares the current root mean square value of vibration with the reference vibration value during the low-speed testing phase. When the vibration value reaches 1.5 to 3 times the reference value and lasts for 100ms to 500ms, and the pressure imbalance of the three contact parts 602 exceeds 10% to 20%, the controller determines that the drill bit may have eccentric installation, drill bit bending, cutting edge wear, or unstable drilling posture.

[0064] The controller first reduces the target speed and differentially adjusts the three electric drive rods 603 to make the pressure of each contact part 602 more consistent. If the vibration still exceeds the threshold after adjustment, the machine stops and outputs a prompt to check the drill bit installation status. This avoids simply increasing the clamping force to cover up the eccentricity problem and reduces the risk of drill bit breakage or hole enlargement.

[0065] The warning unit can use indicator lights, buzzers or vibrators set on the handle 101 or protective shell 301 to distinguish slippage, eccentricity, overload, undervoltage and maintenance prompts by different light colors, flashing frequencies, sound rhythms or vibration rhythms. The intelligent controller uses local offline control as the main real-time control path, and slippage correction and stall stop do not rely on external terminals.

[0066] As an optional implementation, a short-range wireless communication module can be integrated into the handle 101 or the protective housing 301 to send operation records to a mobile terminal or receive authorized threshold configuration and maintenance instructions; the basic drilling and safety protection functions of the drill bit are not affected when wireless communication is interrupted.

[0067] As an optional implementation, machine learning models can be used to help determine the material type, slippage risk, or drill bit wear level, but machine learning models do not replace the aforementioned hard threshold and state machine safety protection.

[0068] Specifically, the model input includes at least several of the following during the low-speed trial: initial rotational speed, rate of decrease in rotational speed, initial current, rate of increase in current, estimated torque, root mean square value of vibration, drill bit diameter, contact force, and relative displacement of contact plate 6023; the model output is material type, slip risk value, or wear level. The training samples are obtained by test drilling with known materials, known drill bit specifications, and known wear levels, and are labeled with the actual material type, manually confirmed slip events, and the wear level obtained by inspection.

[0069] The model can use decision trees, support vector machines, or lightweight neural networks. After training, the model parameters are stored in the storage unit. The model output is only used to adjust the initial target speed, initial resistance force, or soft decision threshold. Overload, stall, and maximum resistance force limits are still enforced by deterministic rules.

[0070] This invention also discloses a method of use, which utilizes a handheld anti-slip drill bit, comprising the following steps: S1. Install the battery into the battery compartment 2, insert the drill bit to be used into the connection hole 403 of the clamping part 4, so that the drill bit passes through the claw plate 5, the detection component 6 and the protective component 7 in sequence, and control the clamping part 4 to clamp and fix the outer periphery of the drill bit by the claw plate 5.

[0071] Specifically, the battery is installed in the battery compartment 2, and the drill bit to be used is inserted into the jaw disk 5, the detection component 6 and the protective component 7 in sequence and initially clamped. After the intelligent controller is powered on, it checks whether the communication or electrical signals of the push switch 102, the adjustment ring 302, the rotating motor 303, the electric drive rod 603 and each sensor are within the allowable range, and controls the electric drive rod 603 to return to zero. If the self-test is abnormal, the rotating motor 303 is locked and a fault prompt is output.

[0072] S2. After the drill bit is initially clamped, the detection component 6 is activated. The electric drive rod 603 drives the contact part 602 to move towards the drill bit, so that the contact plate 6023 abuts against the outer periphery of the drill bit. The detection component 6 obtains the connection status between the drill bit and the clamping part 4.

[0073] Specifically, the three electric drive rods 603 are controlled to extend synchronously, so that the three contact plates 6023 contact the outer periphery of the drill bit. The drill bit diameter is estimated based on the extension amount of the electric drive rods 603. The radial contact force of each contact part 602 is adjusted in a closed loop according to the pressure detection value. When the pressure deviation of the three contact parts 602 exceeds the allowable range, differential adjustment is performed to align the drill bit axis with the common axis of the claw disk 5, the detection component 6 and the protective component 7.

[0074] S3. The rotating motor 303 in the connecting assembly 3 is started by pressing the switch 102. The rotating motor 303 drives the clamping part 4 and the drill bit to rotate synchronously through the drive shaft 401 to perform drilling operation on the position to be processed.

[0075] Specifically, after the user presses the push switch 102, the rotating motor 303 is first controlled to run at 5%-20% of the rated speed for 0.2s-1.0s to collect changes in speed, current, estimated torque, vibration, and resistance force. Based on preset rules, the low resistance, medium resistance, or high resistance working conditions are identified, and the target speed, target resistance force, slippage threshold, and overload threshold are determined. After the data collection is completed, the drill bit is controlled to align with the position to be processed and drilling is performed.

[0076] S4. During the operation of the drill bit, when the detection component 6 detects relative rotation between the drill bit and the clamping part 4, it adjusts the clamping state of the claw disk 5 on the drill bit to restore the drill bit to a stable connection state.

[0077] Specifically, when the circumferential relative displacement of the contact plate 6023, the selectable speed difference between the drill bit and the drive shaft 401, or the decrease in the contact force meets the slippage criterion and is confirmed by at least one of the following: current increase, speed decrease, or abnormal contact force, the target speed of the rotating motor 303 is reduced and the electric drive rod 603 is controlled to gradually increase the contact force; after each adjustment, the speed is re-detected, and when the abnormality disappears, the speed is gradually restored. If the correction is ineffective after 2 to 5 consecutive times or the clamping safety limit is reached, a shutdown warning is issued.

[0078] S5. When an abnormal rotation tendency occurs between the drill bit and the clamping part 4, the tail of the drill bit drives the rotating part 702 of the protective component 7 to rotate relative to the connecting plate 701, and the abnormal rotation amplitude of the drill bit is reduced by the elastic limiting effect in the torsion spring groove 704, so as to protect the clamping part 4 and the detection component 6.

[0079] Specifically, when the changes in operating current and rotational speed simultaneously meet the conditions of overload or stall, the drive power of the rotating motor 303 is quickly stopped or reduced; when the vibration and the pressure imbalance of the three contact parts 602 simultaneously exceed the threshold, the rotational speed is reduced and differential correction is performed. If the correction is ineffective, the machine is stopped and the drill bit is checked. Among these, the safety protection state takes precedence over the slippage correction state.

[0080] S6. Record the cumulative running time, number of slippage corrections, number of stalls, peak current, peak vibration, and the resistance required to maintain stable drilling. Based on the number threshold and trend threshold within the preset time window, determine the drill bit wear, actuator inconsistency, or sensor abnormality, and output a prompt to replace the drill bit or maintain the drilling tools.

[0081] S7. After the user releases the push switch 102, the control motor 303 stops and the electric drive rod 603 remains in the clamping state until the drill bit speed drops to a safe value. Then, according to the disassembly command, the electric drive rod 603 retracts, allowing the claw disk 5 to release the drill bit, storing the current operation data and returning to standby mode. The optional wireless communication module sends operation records or receives parameter configurations after shutdown, but does not participate in real-time safety control.

[0082] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A handheld anti-slip drill, comprising a handheld part (1), wherein a battery compartment (2) and a connecting assembly (3) are respectively connected to both ends of the handheld part (1) along its length, characterized in that: One end of the connecting component (3) is connected to a clamping part (4) for restricting the drill bit; The clamping part (4) includes a drive shaft (401), one end of which is connected to the connecting assembly (3) in the axial direction. The end of the drive shaft (401) away from the connecting assembly (3) is connected to a limiting shell (402) for connection protection. A connecting hole (403) for fixing the drill bit is opened on the side of the limiting shell (402) away from the drive shaft (401). A claw disk (5) is connected in the connecting hole (403). The limiting shell (402) has a connecting cavity (4021) inside, and a detection component (6) for identifying the working status of the drill bit is connected inside the connecting cavity (4021). The connecting cavity (4021) is coaxial with and connected to the connecting hole (403). A protective component (7) is provided on the side of the detection component (6) away from the connecting hole (403). The protective component (7) is located inside the connecting cavity (4021). The detection component (6) includes a support ring (601), the outer circumference of which is fixedly connected to the cavity wall of the connecting cavity (4021). At least three contact parts (602) are abutting on the inner ring of the support ring (601). An electric drive rod (603) is connected to one end of each contact part (602) near the support ring (601). The electric drive rod (603) is fixedly connected to the support ring (601). The protective component (7) includes a connecting plate (701), an annular torsion spring groove (704) is provided on the inner ring of the connecting plate (701), a rotating part (702) is provided in the torsion spring groove (704), and a special-shaped hole (703) for limiting the drill bit is provided through the rotating part (702).

2. The handheld anti-slip drill bit according to claim 1, characterized in that: The contact part (602) includes a support plate (6021), one end of which is connected to an electric drive rod (603). An elastic rod (6024) is connected to the end of the support plate (6021) away from the electric drive rod (603). A movable plate (6022) is connected to the end of the elastic rod (6024) away from the support plate (6021). A contact plate (6023) that abuts against the drill bit is movably provided at the end of the movable plate (6022) away from the elastic rod (6024).

3. The handheld anti-slip drill bit according to claim 1, characterized in that: The hand-held part (1) includes a handle (101), and a push switch (102) for controlling the operation of the clamping part (4) is connected to the handle (101).

4. A handheld anti-slip drill bit according to claim 1, characterized in that: The connecting assembly (3) includes a protective shell (301), and an adjustment ring (302) is rotatably provided at one end of the protective shell (301) near the clamping part (4). A rotating motor (303) that provides power is connected inside the protective shell (301), and the drive shaft (401) is connected to the rotating motor (303).

5. A handheld anti-slip drill bit according to claim 1, characterized in that: The axes of the claw disk (5), the detection component (6), and the protection component (7) are all on the same straight line.

6. A handheld anti-slip drill bit according to claim 2, characterized in that: An elastic damping mechanism for suppressing the contact plate (6023) is provided between the contact plate (6023) and the movable plate (6022).

7. A method of using a handheld anti-slip drill bit, comprising using a handheld anti-slip drill bit as described in any one of claims 1-6, characterized in that: Includes the following steps: S1. Install the battery into the battery compartment (2), insert the drill bit to be used into the connection hole (403) of the clamping part (4), so that the drill bit passes through the claw plate (5), the detection component (6) and the protective component (7) in sequence, and clamp the outer periphery of the drill bit by controlling the clamping part (4); S2. After the drill bit is initially clamped, the detection component (6) is activated. The contact part (602) is driven to move towards the drill bit by the electric drive rod (603), so that the contact plate (6023) abuts against the outer periphery of the drill bit. The connection status between the drill bit and the clamping part (4) is obtained by the detection component (6). S3. The rotating motor (303) inside the connecting assembly (3) is started by pressing the switch (102). The rotating motor (303) drives the clamping part (4) and the drill bit to rotate synchronously through the drive shaft (401) to perform drilling operation on the position to be processed. S4. During the operation of the drill bit, when the detection component (6) detects that there is a relative rotation between the drill bit and the clamping part (4), the clamping state of the claw disk (5) on the drill bit is adjusted so that the drill bit is restored to a stable connection state. S5. When an abnormal rotation tendency occurs between the drill bit and the clamping part (4), the tail of the drill bit drives the rotating part (702) of the protective component (7) to rotate relative to the connecting plate (701), and reduces the abnormal rotation amplitude of the drill bit through the elastic limiting effect in the torsion spring groove (704) to protect the clamping part (4) and the detection component (6).

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