Electric tool with replaceable machine head

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to an electric tool with a replaceable machine head. The utility model provides an electric tool with a replaceable machine head, and aims to solve the problem that a machine head of an electric tool in the prior art cannot be replaced. An electric tool with a replaceable machine head comprises a base assembly and a machine head assembly arranged on the base assembly, the machine head assembly is clamped to the base assembly through a clamping assembly, a driver is arranged in the machine head assembly, and a battery for supplying power to the driver is arranged in the base assembly; the electric tool has the first working mode and the second working mode, and can be flexibly switched between the first machine head assembly and the second machine head assembly according to actual working scenes and requirements. For example, the first machine head assembly is an angle grinder machine head and is suitable for grinding, polishing and other work; the second machine head assembly is a cutting machine head and can be used for cutting various materials.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, specifically relating to a power tool with a replaceable head. Background Technology

[0002] Power tools refer to angle grinders, angle disc sanders, angle polishers, etc., which are a type of commonly used power tools for cutting and grinding.

[0003] In existing power tools, the head and base are a single unit, meaning the head cannot be replaced. This single head design limits the power tool's functionality to one function, resulting in limited applicability. In other words, to achieve other functions, existing power tools require replacing components on the output shaft, not the entire head, thus restricting their applicability. Utility Model Content

[0004] This utility model provides a power tool with a replaceable head, which aims to solve the problem that the head of the power tool cannot be replaced in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A replaceable head power tool includes a base assembly and a head assembly disposed on the base assembly. The head assembly is snapped onto the base assembly via a snap-fit ​​assembly. A driver is disposed within the head assembly, and a battery that supplies power to the driver is disposed within the base assembly.

[0007] The head assembly includes a first head assembly and a second head assembly. The replaceable head power tool includes a first working mode and a second working mode. When the first head assembly is installed on the base assembly via the snap-fit ​​component, the replaceable head power tool is in the first working mode. When the second head assembly is installed on the base assembly via the snap-fit ​​component, the replaceable head power tool is in the second working mode.

[0008] A further improved solution: The locking assembly includes a locking device disposed on the head assembly, the base assembly is provided with a slot that cooperates with the locking device, and an elastic element is disposed between the locking device and the head assembly to push the locking device to cooperate with the slot.

[0009] Based on the above technical solution: through the cooperation of the locking device and the slot, and the elastic element pushing the locking device to engage with the slot, the head assembly can be securely fastened to the base assembly. When the head assembly needs to be replaced, simply overcome the elastic force of the elastic element to separate the locking device from the slot, and the head assembly can be easily removed from the base assembly and replaced with another type of head assembly. This solves the problem of the inability to replace the head assembly in existing power tool technologies, achieving multi-functionality and improving the flexibility and versatility of power tools. The elastic element ensures that the locking device maintains a tight fit with the slot continuously. During the operation of the power tool, even under certain external forces such as vibration and impact, the elastic force of the elastic element ensures that the locking device will not easily disengage from the slot, thus ensuring the stability of the connection between the head assembly and the base assembly, guaranteeing the normal operation of the power tool, and reducing malfunctions and safety hazards caused by loose connections. The snap-fit ​​assembly has a relatively simple structure. Its design, featuring an elastic element that automatically pushes the locking device into the slot, makes installing the head assembly extremely simple, requiring no additional tools. The operator simply aligns the head assembly with the slot on the base assembly, then lowers the head assembly; the elastic element automatically engages the locking device to complete the installation. Disassembly is equally straightforward, requiring only a simple operation to separate the locking device from the slot. This significantly improves operational efficiency and saves time and labor costs. The snap-fit ​​assembly utilizes simple components such as the elastic element, locking device, and slot, employing mature manufacturing processes and resulting in relatively low costs. Furthermore, if any component fails during use, its simple structure facilitates inspection, repair, and replacement, reducing the maintenance costs and complexity of power tools and improving product reliability and lifespan.

[0010] A further improvement: The locking device is also provided with a handle, which is operated to overcome the elastic force of the elastic element and disengage the locking device from the slot.

[0011] Based on the above technical solution: The handle design provides users with a clear and easy-to-apply point of force. When disassembling the head assembly, users only need to grasp the handle and apply a certain amount of external force to easily overcome the elastic force of the elastic element, separating the locking device from the slot. This eliminates the need for other complex tools or special operating techniques, greatly reducing the difficulty of operation and improving convenience and smoothness, allowing users to complete the replacement of the head assembly more efficiently. The handle's ergonomic design better adapts to the grip shape and force application habits of the human hand. Users can apply force more comfortably when operating the handle, reducing hand fatigue and discomfort, improving the human-machine interaction experience when using power tools, making operation more relaxed and enjoyable, and contributing to increased user satisfaction and loyalty. Because the handle provides a clear operating point, users can more accurately control the direction and magnitude of force applied, avoiding accidents caused by improper force application during disassembly, such as sudden detachment of the head assembly or hand injuries. At the same time, the clear operating method reduces the risk of misoperation, ensuring the safety of the operation process and reducing the probability of accidents.

[0012] A further improved solution: The locking device is also provided with a driving surface. During the assembly of the head assembly and the base assembly, the driving surface contacts the base assembly and overcomes the elastic force of the elastic element, causing the locking device to move away from the base assembly.

[0013] Based on the above technical solution: during assembly, after the drive surface contacts the base assembly, the locking device automatically overcomes the elastic force of the elastic element and moves away from the base assembly. This eliminates the need for manual pre-movement of the locking device, achieving automated obstacle avoidance during assembly. For example, when installing the head assembly onto the base assembly, the worker only needs to directly align the two without additional adjustments to the locking device position, greatly improving assembly speed and convenience. For operators, there is no need for precise control of the locking device's position and state; they only need to assemble the head assembly and base assembly according to normal assembly methods. This makes the assembly process simpler and more intuitive, allowing even beginners to quickly master the assembly method and reducing assembly failures caused by improper operation.

[0014] A further improved solution: the drive surface is inclined, and the locking device is slidably connected to the head assembly.

[0015] Based on the above technical solution: When the head assembly and base assembly are assembled, the inclined drive surface generates a horizontal component force upon contact with the base assembly. Since the locking device is slidably connected to the head assembly, this component force allows the locking device to move automatically and smoothly away from the base assembly along the sliding direction. This is similar to setting a natural guide path for the movement of the locking device in mechanical assembly, avoiding jamming or stuck situations, and greatly improving assembly efficiency and smoothness. Compared to vertical or other complex-shaped drive surfaces, the inclined drive surface, when in contact with the base assembly, has a contact area and contact method that are more conducive to dispersing the pressure during assembly, thereby reducing resistance during the assembly process. This makes it easier for operators to assemble the head assembly, reduces the required assembly force, and further improves operational convenience.

[0016] A further improved solution: the head assembly is provided with a locking ridge, and the base assembly is provided with a locking groove that mates with the locking ridge.

[0017] Based on the above technical solution: the engagement of the locking ridge and the slot provides an additional connection point for the head assembly and the base assembly. During the operation of a power tool, vibrations and forces in various directions are generated. The locking ridge, embedded in the slot, increases the contact area between the two, thereby increasing friction and making the connection between the head assembly and the base assembly more stable. This better resists these external forces, reduces loosening or displacement caused by vibration, and ensures the normal operation of the power tool. This engagement method can more evenly distribute the stress generated during the operation of the power tool. For example, when the power tool is performing high-intensity work, the locking ridge and the slot can jointly bear forces from different directions, avoiding excessive local stress, further improving the stability and reliability of the connection, and extending the service life of the power tool. The locking ridge and the slot also serve a positioning and guiding function. During assembly, the operator can quickly and accurately determine the relative position of the head assembly and the base assembly by aligning the locking ridge with the slot, ensuring that they can be correctly assembled.

[0018] A further improved solution: the first head assembly is an angle grinder head, and the second head assembly is a cutting machine head.

[0019] Based on the above technical solutions, angle grinders and cutting machines have significant functional differences. Angle grinders are commonly used for grinding, polishing, cutting thin metal materials, and grinding stone; while cutting machines are better suited for precise cutting of various materials, such as wood and metal pipes. By equipping these two different head components, this interchangeable-head power tool can flexibly switch between usage modes in different work scenarios, eliminating the need to prepare multiple single-function tools to complete different tasks, greatly improving the tool's versatility and applicability. In many fields such as metal processing, construction and decoration, and wood processing, different operations such as grinding and cutting are frequently required. This interchangeable-head design allows a single power tool to play a role in multiple fields, enabling both professional construction teams and DIY enthusiasts to complete more diverse tasks with this tool, expanding its application range.

[0020] A further improved solution: The driver includes a motor, which is a brushless DC motor.

[0021] Based on the above technical solutions, the structural characteristics of brushless DC motors enable them to achieve more efficient energy conversion. Compared to traditional brushed motors, they reduce friction and energy loss between the brushes and the commutator, thus converting more electrical energy into mechanical energy and providing a stronger and more stable power output for power tools. This allows angle grinder heads to more easily handle materials of varying hardness during grinding operations; and cutting machine heads to achieve faster cutting speeds and smoother cuts during the cutting process. Brushless DC motors can achieve a wide range of speed adjustments through precise electronic control. Users can flexibly adjust the motor speed according to different work requirements, such as different materials and processing techniques. For example, when using an angle grinder for fine grinding, reducing the motor speed can improve grinding accuracy; while when using a cutting machine to cut thicker materials, increasing the motor speed can improve cutting efficiency.

[0022] A further improved solution: The brushless DC motor is a 10mm brushless DC motor.

[0023] Based on the above technical solutions: a 10mm size is relatively small, resulting in a compact and lightweight motor. Using this motor in power tools helps achieve overall miniaturization and lightweight design. For angle grinders and cutters that frequently require handheld operation, it makes them easier for users to control, reduces hand fatigue during prolonged use, and improves operational flexibility, especially suitable for scenarios involving confined spaces or working at heights. The smaller motor size provides greater flexibility in the internal structural layout of power tools. The positions of batteries, control circuits, and other components can be arranged more rationally, optimizing the internal space of the tool and improving overall structural compactness and stability.

[0024] A further improved solution: A first connector is provided on the base assembly, and a second connector is provided on the head assembly. The first connector is plugged into the second connector. A battery is provided on the base assembly, and the battery supplies power to the motor through the first connector and the second connector.

[0025] Based on the above technical solution, the plug-in connection method of the first and second connectors provides a stable and reliable electrical connection. During the operation of power tools, the motor requires a continuous and stable power supply to ensure its normal operation. This reliable connection method effectively reduces power interruptions or voltage fluctuations caused by loose connections or poor contact, ensuring that the motor can always operate at a stable power level, thereby guaranteeing the working performance and efficiency of the power tool. Power tools may be subjected to external forces such as vibration and impact during use. The reasonable design of the first and second connectors allows them to maintain a good connection even under these complex working conditions. For example, when an angle grinder is performing high-speed grinding or a cutting machine is performing heavy cutting, the motor can still receive a stable power supply, avoiding malfunctions due to external interference and improving the reliability and durability of the power tool.

[0026] The beneficial effects of this utility model are as follows:

[0027] The power tool provided by this utility model has two working modes, first and second, which can be flexibly switched between the first and second head components according to the actual work scenario and needs. For example, the first head component is an angle grinder head, suitable for grinding, polishing, and other work; the second head component is a cutting head, which can be used to cut various materials. This design allows one power tool to undertake multiple different types of work tasks, eliminating the need to purchase multiple single-function tools for different jobs. Whether in home renovation, industrial manufacturing, or maintenance, this power tool can adapt to different working environments and task requirements due to its interchangeable head feature. Its advantages are even more obvious in situations where space is limited or where frequent tool function changes are required, greatly improving the tool's versatility and applicability.

[0028] During operation, switching between different working modes is as simple as replacing the head assembly via the snap-fit ​​connector; no complicated operations or additional tools are required. This quick-switch function saves significant time and improves work efficiency, especially in urgent or time-sensitive tasks. The snap-fit ​​connector design makes head assembly replacement simple and intuitive, allowing even users without professional skills to easily master the process. This lowers the barrier to entry for using the tool, enabling more people to conveniently use power tools to complete various tasks.

[0029] Replacing multiple tools with a single one reduces storage space requirements and lowers maintenance workload and costs. For example, only a single base assembly and battery require unified maintenance and upkeep, eliminating the need to manage multiple tools separately. For users, purchasing a single head-changeable power tool is significantly cheaper than buying multiple single-function power tools. This design is particularly beneficial for users who don't frequently use different functions but occasionally require them; it meets diverse work needs at a lower cost, effectively saving money. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For users of ordinary skills in the art, other related drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the internal structure of a power tool with a replaceable head according to this utility model.

[0032] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0033] Figure 3 This is a schematic diagram of the base assembly in a power tool with a replaceable head according to this utility model.

[0034] Figure 4 This is a schematic diagram of the head assembly in a replaceable head power tool according to this utility model.

[0035] Figure 5 This is a schematic diagram of a power tool with a replaceable head in its first working mode.

[0036] Figure 6 This is a schematic diagram of a power tool with a replaceable head in its second working mode according to this utility model.

[0037] Explanation of the labels in the diagram:

[0038] 1-Base assembly; 2-Head assembly; 3-Snap-fit ​​assembly; 4-Locking device; 5-Handle; 6-Drive surface; 7-Elastic element; 8-Snap-fit ​​edge; 9-Driver; 10-Battery; 11-First contactor; 12-Second contactor. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model. All other embodiments obtained by users of the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0040] refer to Figures 1 to 6 A replaceable head power tool includes a base assembly 1 and a head assembly 2 disposed on the base assembly 1. The head assembly 2 is snapped onto the base assembly 1 via a snap-fit ​​assembly 3. A driver is disposed inside the head assembly 2, and a battery 10 that supplies power to the driver is disposed inside the base assembly 1.

[0041] The head assembly 2 includes a first head assembly 2 and a second head assembly 2. The replaceable head power tool includes a first working mode and a second working mode. When the first head assembly 2 is installed on the base assembly 1 through the snap-fit ​​component 3, the replaceable head power tool is in the first working mode. When the second head assembly 2 is installed on the base assembly 1 through the snap-fit ​​component 3, the replaceable head power tool is in the second working mode.

[0042] refer to Figures 1 to 5 The locking assembly 3 includes a locking device 4 disposed on the head assembly 2. The base assembly 1 has a slot that mates with the locking device 4. An elastic element 7 is disposed between the locking device 4 and the head assembly 2 to push the locking device 4 into the slot. The locking device 4 also has a handle 5. Operating the handle 5 overcomes the elastic force of the elastic element 7, causing the locking device 4 to disengage from the slot. The locking device 4 also has a driving surface 6. During the assembly of the head assembly 2 and the base assembly 1, the driving surface 6 contacts the base assembly 1 and overcomes the elastic force of the elastic element 7, causing the locking device 4 to move away from the base assembly 1. The driving surface 6 is inclined, and the locking device 4 is slidably connected to the head assembly 2.

[0043] The elastic element 7 can be a spring. A receiving groove for accommodating the spring can be provided on the machine head assembly 2. One end of the spring is fixed or in contact with the top wall of the receiving groove, and the other end of the spring is in contact with or fixed to the locking device 4. The locking device 4 can be slidably connected to the machine head assembly 2 in the vertical direction, or it can be rotatably connected to the machine head.

[0044] Wherein: the head assembly 2 is provided with a retaining ridge 8, and the base assembly 1 is provided with a retaining groove that mates with the retaining ridge 8. The retaining ridge 8 and the head assembly 2 are an integral structure. For example, the retaining ridge 8 can be provided on the outer shell of the head assembly 2. The retaining ridge 8 and the outer shell can be an integral structure. The cross-sectional shape of the retaining ridge 8 is rectangular.

[0045] Specifically: the first head assembly 2 is an angle grinder head, and the second head assembly 2 is a cutting machine head. The driver 9 includes a motor, which is a brushless DC motor. The brushless DC motor is a 10mm brushless DC motor. Other motor models can also be used.

[0046] refer to Figures 1 to 5 The device comprises: a first connector 11 on the base assembly 1; a second connector 12 on the head assembly 2; the first connector 11 being plugged into the second connector 12; and a battery 10 on the base assembly 1, which supplies power to the motor through the first connector 11 and the second connector 12. The battery 10 may be a lithium battery. The first connector 11 and the second connector 12 have a structure similar to a plug and socket.

[0047] The working principle of this embodiment:

[0048] When the first head assembly 2 is installed onto the base assembly 1 via the snap-fit ​​assembly 3, the replaceable head power tool enters its first working mode. At this time, the battery 10 inside the base assembly 1 supplies power to the driver 9 inside the first head assembly 2, which in turn drives the first head assembly 2 to perform the corresponding work task. For example, if the first head assembly 2 is a drilling component, the driver 9 will rotate the drill bit to perform the drilling function. Because the battery 10 provides electrical energy, the driver 9 converts this electrical energy into mechanical energy, driving the first head assembly 2 to operate and thus complete the specific task.

[0049] When switching to the second working mode is required, the first head assembly 2 is detached from the base assembly 1 via the snap-fit ​​assembly 3, and then the second head assembly 2 is installed onto the base assembly 1 via the snap-fit ​​assembly 3. At this time, the replaceable head power tool enters the second working mode. The battery 10 in the base assembly 1 also supplies power to the driver 9 in the second head assembly 2. The driver 9 drives the second head assembly 2 to perform different working tasks according to its structure and function. For example, if the second head assembly 2 is a grinding component, the driver 9 will drive the grinding disc to rotate, thus achieving the grinding function.

[0050] This utility model is not limited to the above-mentioned optional embodiments. Under the premise of non-contradiction, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the guidance of this utility model. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope of the claims of this utility model are within the protection scope of this utility model.

Claims

1. A head changeable electric power tool characterized by comprising: The base assembly and the head assembly are arranged on the base assembly, the head assembly is clamped on the base assembly through the clamping assembly, the head assembly is provided with a driver, and the base assembly is provided with a battery for supplying power to the driver; The head assembly includes a first head assembly and a second head assembly, the head replaceable electric tool includes a first working mode and a second working mode, the head replaceable electric tool is in the first working mode when the first head assembly is installed on the base assembly through the clamping assembly, and the head replaceable electric tool is in the second working mode when the second head assembly is installed on the base assembly through the clamping assembly.

2. The tool according to claim 1, wherein: The clamping assembly includes a locker arranged on the head assembly, the base assembly is provided with a clamping groove matched with the locker, and an elastic member is arranged between the locker and the head assembly to push the locker to match the clamping groove.

3. The tool according to claim 2, wherein: The locker is further provided with a handle, and operating the handle overcomes the elastic force of the elastic member to make the locker disengage from the clamping groove.

4. The tool head exchangeable electric power tool according to claim 3, characterized in that: The locker is further provided with a driving surface, and the driving surface is in contact with the base assembly during assembly of the head assembly and the base assembly, and overcomes the elastic force of the elastic member to make the locker move away from the base assembly.

5. A power tool according to claim 4, wherein: The driving surface is arranged obliquely, and the locker is slidingly connected to the head assembly.

6. A power tool according to claim 5, wherein: The head assembly is provided with a clamping rib, and the base assembly is provided with a clamping groove matched with the clamping rib.

7. The tool according to claim 1, wherein: The first head assembly is an angle grinder head, and the second head assembly is a cutting machine head.

8. The tool head exchangeable electric power tool according to claim 1, characterized in that: The driver includes a motor, and the motor is a brushless direct current motor.

9. A power tool according to claim 8, wherein: The brushless direct current motor is a 10mm brushless direct current motor.

10. A power tool according to claim 8 or 9, characterized in that: The base assembly is provided with a first power connector, the head assembly is provided with a second power connector, the first power connector is inserted into the second power connector, the base assembly is provided with a battery, and the battery supplies power to the motor through the first power connector and the second power connector.

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