Percussion drill with drill bit capable of being automatically locked

Abstract

The utility model belongs to the technical field of percussion drills, and particularly discloses a percussion drill with a drill bit automatically locked. Comprising a drill bit, a connecting rod, a self-locking disc, a driving motor and a switch, the driving motor is electrically connected with the switch, a rotor of the driving motor is connected with a stator of the driving motor, the stator is connected with an output gear through a motor shaft, the output gear is connected with the connecting rod, and the connecting rod is sleeved with the self-locking disc. The tail end of the connecting rod is connected with the drill bit. In actual application, the connecting rod is locked through the self-locking disc, and the problem that a drill bit is difficult to install due to the fact that the connecting rod rotates when the drill bit is installed is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of impact drills, and specifically discloses an impact drill with automatic drill bit locking. Background Art

[0002] A lithium battery impact drill is a power tool that uses a lithium battery as a power source, integrating dual functions of rotation and impact, and is designed specifically for efficiently drilling holes in hard materials such as concrete and brick walls. The tool has a simple structure, mainly including a handle part, with a replaceable drill bit assembled at the front end, and a start trigger configured in the hand-held area at the rear. The trigger is connected to the built-in electric drive system. The user only needs to gently press the trigger to start the device and release it to stop. However, in actual operation, if the impact drill needs to be used continuously for a long time, the traditional trigger design requires the operator to continuously press, which undoubtedly increases the burden on the hand, especially during high-intensity or long-time operations, easily leading to hand fatigue.

[0003] An impact drill with high safety, with the patent application number CN209716525U, includes a drive motor, a connecting shaft, and a locking assembly. The locking assembly includes a locking disc, and also includes a transmission assembly. The transmission assembly includes a fixed disc fixed to the drive motor and a positioning disc fixed to the locking disc. The positioning disc is provided with positioning convex teeth on the side facing the fixed disc, and the fixed disc is provided with locking convex teeth meshing with a fixed groove. A compression spring is provided on the side of the positioning convex teeth facing the locking convex teeth, and one end of the compression spring is fixed to the fixed disc. The above device cannot adjust the power of the impact drill, and a direct power outage has a large impact on the positioning disc and is easily damaged. Therefore, it is urgent for those skilled in the art to solve the above technical problems. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an impact drill with automatic drill bit locking in view of the above-mentioned deficiencies of the prior art. The impact drill with automatic drill bit locking locks the connecting rod through a self-locking disc, solves the problem that the connecting rod cannot be locked during drill bit installation, resulting in difficult drill bit installation, and can adjust the output power of the drive motor through a power adjustment switch to reduce the impact on the self-locking disc.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] An impact drill with automatic drill bit locking, comprising a drill bit, a connecting rod, a self-locking disc, a drive motor and a switch; the drive motor is electrically connected to the switch, the rotor of the drive motor is connected to the stator of the drive motor, the stator is connected to an output gear through a motor shaft, the output gear is connected to the connecting rod, the self-locking disc is sleeved on the connecting rod, the self-locking disc includes a cylindrical pin, a planetary carrier gear disc, a shaft locking ring and a driving block, the cylindrical pin and the planetary carrier gear disc are sleeved between the shaft locking ring and the driving block, the planetary carrier gear disc and the cylindrical pin are connected to the output gear, a positioning groove is arranged on the driving block, and the shaft positioning groove is adapted to the connecting rod; the terminal of the connecting rod is connected to the drill bit.

[0007] Further, the drill bit, the connecting rod, the self-locking disc and the drive motor are all installed in a housing, the switch includes a switch trigger and a switch body, the switch trigger is installed on the side wall of the housing, the switch trigger is connected to the switch body, the switch body is installed in the housing, a power cord sheath is installed at the bottom of the housing, a power cord is sleeved in the power cord sheath, the power cord is connected to the switch body, and the switch body is electrically connected to the drive motor.

[0008] All the main components (drill bit, connecting rod, self-locking disc, drive motor) are integrally installed in the housing, forming a compact whole, which is not only convenient for carrying and storage, but also makes the tool more stable during use, reducing the interference of external factors on the internal structure. The switch trigger is installed on the side wall of the housing, which conforms to the ergonomic design. The operator can easily control the start and stop of the drill with one hand without having to search or adjust the hand position laboriously, reducing the operation difficulty and improving the work efficiency. The power cord is installed at the bottom of the housing through the sheath, effectively preventing accidental pulling or abrasion of the cable during use, reducing the risk of electric shock. At the same time, the sheath also plays a certain role in waterproofing and dustproofing, extending the service life of the tool and the cable.

[0009] Further, a plurality of grooves are arranged on the switch trigger.

[0010] The groove design can increase the friction force of the contact surface between the finger and the trigger. Even in the case of wet or oily hands, it can ensure that the operator can stably and accurately control the switch, avoiding misoperation caused by slipping hands, improving the safety and accuracy during use. By increasing the friction coefficient of the contact area, the user can save more effort when pressing the trigger for a long time, reducing the fatigue of the fingers and hands. This is because the groove design helps to disperse the finger pressure and avoid excessive compression of a single force point. The groove can be used as a stress dispersion structure, reducing the wear of the trigger surface caused by long-term use, thereby extending the service life of the switch trigger and even the entire tool. The uneven surface is more resistant to long-term wear than the smooth surface.

[0011] Furthermore, a cooling fan blade is installed at the head end of the stator. The cooling fan blade is sleeved on the motor shaft. A connecting frame is further provided between the output gear and the self-locking disc. Matching connecting teeth are provided on both the connecting frame and the output gear.

[0012] The cooling fan blade installed at the head end of the stator is sleeved on the motor shaft. When the motor runs, the fan blade will rotate together with the motor shaft, thereby generating an air flow, strengthening the air circulation inside the motor, effectively taking away heat, preventing the motor from overheating, extending the service life of the motor, and ensuring the stable operation of the power tool. The additional connecting frame between the output gear and the self-locking disc not only provides additional physical support, enhancing the rigidity and stability of the entire transmission system, but also ensures the accuracy and efficiency of power transmission through the matching connecting teeth provided on the connecting frame and the output gear, reducing energy loss during transmission. The design of the connecting frame makes the installation and disassembly of the output gear and the self-locking disc more convenient, facilitating daily maintenance and part replacement, improving maintenance efficiency, and reducing maintenance costs.

[0013] Furthermore, a drill chuck is also provided at the top of the drill bit.

[0014] The drill chuck design allows users to quickly change the drill bit without tools. Just manually operate the chuck to open or close it and clamp drill bits of different specifications, greatly saving replacement time and improving work efficiency. A high-quality drill chuck can ensure that the drill bit is firmly fixed on the connecting rod. Even under high-torque operations or in impact drill mode, it can maintain the stability of the drill bit, reducing the risk of drill deviation or slipping and improving the accuracy and quality of drilling. The drill chuck is usually designed with a universal interface, capable of being compatible with drill bits of different brands and specifications, increasing the flexibility and application range of the tool. Users can freely change the drill bit according to the operation requirements, whether it is for drilling, grinding, or screwdriver bits, etc. The chuck design facilitates users to manually adjust the center position or tightness of the drill bit to ensure the correct positioning of the drill bit during use. At the same time, regularly cleaning foreign objects inside the chuck and lubricating it can also effectively extend its service life and reduce maintenance costs.

[0015] Furthermore, a power adjustment switch is also provided on the housing, and the power adjustment switch is electrically connected to the drive motor.

[0016] Through power adjustment, users can adjust the output power of the motor according to the hardness of the material encountered during drilling or screwing (such as wood, metal, concrete, etc.), so as to ensure work efficiency while avoiding over-drilling or damaging softer materials, or providing sufficient torque on hard materials to complete the operation. The power adjustment switch allows users to adjust the drilling speed, which is particularly important for fine operations that require precise depth control or avoid overheating. Low speed is suitable for situations that require more control force, and high speed is suitable for quickly penetrating softer materials. When the maximum power is not required, reducing the power can effectively save electricity, reduce energy consumption, and at the same time reduce the wear of the motor and extend the overall service life of the power tool. When turning off the impact drill, the motor speed can be reduced first to reduce the damage to the self-locking disc caused by sudden stop.

[0017] The utility model has the following beneficial effects:

[0018] 1. The self-locking disc includes a cylindrical pin, a planetary gear disc, an axial lock ring and a driving block, which can automatically lock the connecting rod when the drill bit stops working or the drill bit is replaced, effectively preventing the drill bit from rotating due to accidental touch or the residual rotation of the motor, and reducing potential safety hazards during the operation process;

[0019] 2. The combination of the planetary gear disc and the cylindrical pin, through precise meshing with the output gear, enhances the stability of the transmission system, making the drilling operation smoother. Especially during high-load or long-time operations, it can reduce jumping and vibration and improve the operation accuracy;

[0020] 3. By installing a power adjustment switch on the housing, the output power of the driving motor can be adjusted as needed, and the speed of the driving motor can be adjusted. When the drill bit needs to be replaced or the work stops, the power adjustment switch cooperates with the self-locking disc to quickly lock the connecting rod and reduce the damage to the self-locking disc caused by impact. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the internal structure of the utility model.

[0022] Figure 2 is a schematic diagram of the structure of the driving motor of the utility model.

[0023] Figure 3 is a schematic diagram of the structure of the self-locking disc of the utility model.

[0024] Figure 4 is Figure 1 an enlarged schematic diagram of part A in

[0025] Among them are: 1 - drill bit; 11 - drill bit chuck; 2 - connecting rod; 3 - switch; 31 - switch trigger; 32 - switch body; 4 - housing; 41 - power cord sheath; 42 - power adjustment switch; 5 - drive motor; 51 - rotor; 52 - stator; 53 - motor shaft; 54 - output gear; 55 - cooling fan; 6 - self - locking disc; 61 - shaft lock ring; 62 - drive block; 621 - positioning groove; 63 - cylindrical pin; 64 - planet carrier gear disc. Specific embodiments

[0026] The following further describes the present utility model in detail in conjunction with the accompanying drawings and specific preferred embodiments.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by terms such as "left side", "right side", "upper part", "lower part", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so it cannot be understood as a limitation to the present utility model. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present utility model.

[0028] Referring to Figure 1 , it can be seen that an impact drill with automatic drill bit locking includes a housing 4. Inside the housing 4, there are a drive motor 5, a self - locking disc 6 and a switch body 32. On the upper part of the housing 4, there is a power adjustment switch 42. On the side wall of the housing 4, there is a switch trigger 31. At the bottom of the housing 4, there is a power cord sheath 41. At the front end of the housing 4, there is a drill bit 1. At the top of the drill bit 1, there is a drill bit chuck 11. A cooling fan 55 is also installed between the drive motor 5 and the self - locking disc 6.

[0029] In one embodiment, the drive motor 5 is fixed at a predetermined position of the housing 4 by bolts. Ensure that the motor shaft 53 is aligned with the transmission mechanism inside the housing 4. Install the self - locking disc 6 to ensure its correct meshing with the output gear 54 of the drive motor 5. For the installation of the self - locking disc 6, first install the output gear 53, then put the self - locking disc 6 on the output gear 53. Install the switch body 32 at the designated position of the housing 4 and fix it with screws. Install the switch trigger 31 on the side wall of the housing and connect it to the switch body 32 through internal connectors to ensure the smooth operation of the trigger. Pass the power cord through the power cord sheath 41 and connect it to the switch body 32, ensuring that the connection is firm to prevent loosening or short - circuit. Install the power adjustment switch 42 on the upper part of the housing 4, adjust it to the appropriate position according to the product design and fix it. Install the drill bit 1 on the connecting rod 2 through the drill bit chuck 11;

[0030] The power adjustment switch 42 is a continuously adjustable knob. The operator can select different power set points by turning the power adjustment switch 42. The power adjustment switch 42 is connected to an electronic speed controller which can recognize these position changes, usually through internal sensors or encoders. These components can convert the physical position into an electrical signal (this is prior art and will not be elaborated here). The electronic speed controller controls the output power of the drive motor 5, thereby adjusting the rotational speed of the motor shaft 53.

[0031] Referring to Figure 2 and Figure 4 , it can be seen that the drive motor 5 includes a rotor 51 electrically connected to the switch body 32. The rotor 51 is connected to a stator 52, the stator 52 is connected to a motor shaft 53, the motor shaft 53 is connected to an output gear 54. A cooling fan 55 is provided between the stator 52 and the output gear 54. The output gear 54 is connected to a connecting rod 2, and the connecting rod 2 is sleeved in a self-locking disc 6.

[0032] In one embodiment, the rotor 51 is correctly aligned and inserted into the designated position of the electrically connected switch body 32 to ensure smooth and firm electrical connection. The stator 52 is arranged around the rotor 51, and the two interact magnetically but do not contact directly. The stator 52 is fixed to the motor housing using bolts to ensure the correct alignment and stability of the stator 52 and the rotor 51. The motor shaft 53 passes through the central hole of the rotor 51 and is connected to the shaft end of the rotor 51. A keyway is used to ensure the reliable connection between the motor shaft 53 and the rotor 51. The cooling fan 55 is installed between the stator 52 and the output gear 54 to ensure that the cooling fan 55 can rotate freely without interfering with other components. The design of the cooling fan 55 is intended to enhance the cooling effect by utilizing the airflow generated during motor operation. The output gear 54 is installed at the other end of the motor shaft 53 and fixed by press-fitting. One end of the connecting rod 2 is connected to the output gear 54, usually fixed using a pin shaft to ensure the rigidity and reliability of the transmission. The other end of the connecting rod 2 is sleeved into the self-locking disc 6. The function of the self-locking disc 6 is to provide a locking mechanism to prevent excessive movement or accidental disconnection and ensure the safety of the system.

[0033] Referring to Figure 3 , it can be seen that the self-locking disc 6 includes a shaft lock ring 61, a drive block 62, a positioning groove 621, a cylindrical pin 63 and a planetary gear disc 64. The shaft lock ring 61 forms the outer ring of the self-locking disc 6 and is used to lock the motor shaft 53 and the connecting rod 2. Inside the shaft lock ring 61, there are a cylindrical pin 63 and a planetary gear disc 64. Inside the cylindrical pin 63 and the planetary gear disc 64, there is a drive block 62, and the inner wall of the drive block 62 is provided with a positioning groove 621.

[0034] In one embodiment, the shaft lock ring 61 is placed at a predetermined position of the connecting rod 2, and the cylindrical pin 63 is inserted into the shaft lock ring 61 to ensure that the cylindrical pin 63 can slide freely. The planet carrier gear disc 64 is installed around the cylindrical pin 63, and together with the cylindrical pin 63 and the shaft lock ring 61, they form a relatively movable system. The driving block 62 is sleeved inside the planet carrier gear disc 64 to ensure correct alignment between the two. The positioning groove 621 inside the driving block 62 should match the corresponding structure on the connecting rod 2 for subsequent fixation. By adjusting the position of the cylindrical pin 63, the driving block 62 can be accurately docked with the positioning groove 621 on the connecting rod to complete the pre-assembly of the self-locking structure. At this time, the planet carrier gear disc 64 should mesh with the teeth on the output gear 54 to ensure the smooth transmission of power. When the driving motor 5 rotates, it is the planet carrier gear disc 64 that first touches the driving block 62 to drive the output gear 54 to rotate to achieve the working purpose. When the impact drill stops, the rotational speed of the driving motor 5 can be reduced until it stops by adjusting the power adjustment switch 42. At this time, the driving block 62 is locked by the cylindrical pin 63, so as to achieve the purpose of locking the connecting rod 2 and the drill bit 1.

[0035] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. An impact drill with automatic bit locking, characterized in that: It includes a drill bit, a connecting rod, a self-locking disc, a drive motor and a switch; the drive motor is electrically connected to the switch, the rotor of the drive motor is connected to the stator of the drive motor, the stator is connected to an output gear through a motor shaft, the output gear is connected to the connecting rod, the self-locking disc is sleeved on the connecting rod, the self-locking disc includes a cylindrical pin, a planetary carrier gear disc, an axial locking ring and a drive block, the cylindrical pin and the planetary carrier gear disc are sleeved between the axial locking ring and the drive block, the planetary carrier gear disc and the cylindrical pin are connected to the output gear, a positioning groove is provided on the drive block, and the positioning groove is adapted to the connecting rod; the terminal of the connecting rod is connected to the drill bit.

2. The percussion drill with automatic drill bit locking according to claim 1, characterized in that: The drill bit, the connecting rod, the self-locking disc and the drive motor are all installed in a housing. The switch includes a switch trigger and a switch body. The switch trigger is installed on the side wall of the housing, the switch trigger is connected to the switch body, the switch body is installed in the housing, a power cord sheath is installed at the bottom of the housing, a power cord is sleeved in the power cord sheath, the power cord is connected to the switch body, and the switch body is electrically connected to the drive motor.

3. The impact drill with automatic drill bit locking according to claim 2, characterized in that: A plurality of grooves are provided on the switch trigger.

4. The impact drill with automatic drill bit locking according to claim 1, characterized in that: A cooling fan blade is further installed at the head end of the stator. The cooling fan blade is sleeved on the motor shaft. A connecting frame is further provided between the output gear and the self-locking disc. Matching connecting teeth are provided on both the connecting frame and the output gear.

5. An impact drill with automatic locking of the drill bit according to claim 1, characterized in that: A drill chuck is further provided at the top of the drill bit.

6. The impact drill with automatic drill bit locking according to claim 2, characterized in that: A power adjustment switch is further provided on the housing. The power adjustment switch is electrically connected to the drive motor.

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