A rechargeable angle grinder

Abstract

The utility model discloses a kind of charging type angular polishing machine, applied in electric tool technical field, including shell assembly, handle assembly, the shell assembly and handle assembly are mutually bolted, the inside bolt connection of shell assembly has motor assembly, the inside of shell assembly and handle assembly is respectively equipped with gear box assembly and control component in the side away from motor assembly, the top front end of shell assembly is equipped with push block type switch, the grip part of handle assembly is equipped with trigger type switch. Through the unique double-switch layout and internal optimization design, users can freely select switches according to working posture. Fatigue and space limitation problems of single-switch solution can be significantly alleviated. Not only improve the operation convenience of tool, but also strengthen the safety protection mechanism, so as to realize multi-posture operation. The pain point of single switch of traditional charging type angular polishing machine is solved, and has high practical value.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, and specifically relates to a rechargeable angle grinder. Background Technology

[0002] Angle grinders, also known as angle polishers, are mainly used as high-speed rotating tools and are widely used in grinding and cutting of materials such as metal and stone.

[0003] Angle grinders are generally divided into corded and cordless angle grinders. Corded angle grinders (such as those powered by 220V AC) have limited operating range due to the need for a power cable, especially when working outdoors or at heights, and frequent relocation can easily cause safety hazards. Therefore, in recent years, cordless angle grinders powered by lithium batteries (i.e., rechargeable angle grinders) have become popular due to their portability.

[0004] However, most existing rechargeable angle grinders use a single-switch control scheme, which has the following drawbacks: First, it is inconvenient to operate. The single switch of the rechargeable angle grinder is fixed in position (such as the front of the handle). When the user adopts different gripping postures (such as side grip or upside down grip), the hand position needs to be adjusted significantly to reach the switch, which is especially difficult in narrow spaces (such as inside pipes or corners). Secondly, there is the issue of fatigue. When a rechargeable angle grinder is used continuously for a long time (e.g., more than 30 minutes), single-switch operation can lead to finger or wrist fatigue, thereby increasing the risk of accidental touch. Finally, there are safety defects. Most of the existing improvements to rechargeable angle grinders focus on integrating speed control functions, but neglect the optimization of switch layout. For example, the power cannot be quickly cut off in an emergency, which poses certain safety hazards. Utility Model Content

[0005] The purpose of this invention is to provide a rechargeable angle grinder that significantly alleviates the fatigue and space limitations associated with single-switch designs through a unique dual-switch layout and optimized internal design. This not only improves the ease of operation but also strengthens the safety protection mechanism, thereby enabling multi-position operation, reducing fatigue, enhancing accidental touch protection, and improving the safety of using the rechargeable angle grinder.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a rechargeable angle grinder, comprising a housing assembly and a handle assembly, wherein the housing assembly and the handle assembly are bolted together, a motor assembly is bolted inside the housing assembly, a gearbox assembly and a control assembly are respectively installed on the side of the housing assembly and the handle assembly away from the motor assembly, a push-block switch is installed at the top front end of the housing assembly, and a trigger switch is installed at the gripping part of the handle assembly.

[0007] The above technical solution, through a unique dual-switch layout and optimized internal design, allows users to freely select the switch according to their working posture. This significantly alleviates the fatigue and space limitations of single-switch solutions. It not only improves the ease of operation but also strengthens the safety protection mechanism, enabling multi-posture operation. It solves the pain point of traditional rechargeable angle grinders with a single switch and has high practical value. With independent operation of the two switches, there is no correlation between them. The MCU microcontroller follows a preset interlocking state machine logic. When either switch is activated, the MCU microcontroller immediately ignores the input of the other switch until the currently activated switch is released. This interlocking mechanism avoids operational conflicts and improves the safety of using the rechargeable angle grinder.

[0008] The present invention is further configured such that the push-block switch is composed of a switch push block, a switch lever, and a switch, and the trigger switch is composed of a trigger switch. The switch push block is horizontally slidably connected to the top of the housing assembly. The two ends of the switch lever are respectively fixedly connected to the switch push block and the switch. A spring mechanism is installed inside the switch push block. The switch is bolted to the inside of the handle assembly. The trigger switch is vertically slidably connected to the handle assembly.

[0009] The above technical solution is adopted: the dust in the switch slots of both switches is cleaned and the insulation layer of the wires is checked every 50 hours of use; the gearbox is replenished with grease every six months to ensure the operational stability of the rechargeable angle grinder.

[0010] The present invention is further configured such that the control component comprises a battery bracket, a rechargeable lithium battery pack, and an MCU microcontroller. The rechargeable lithium battery pack and the MCU microcontroller are bolted to the inside of the handle assembly via the battery bracket, and the rechargeable lithium battery pack and the MCU microcontroller are electrically connected via wires.

[0011] The above technical solution employs the STMicroelectronics STM32G030F6P6 microcontroller in the control component. This microcontroller is based on the ARM Cortex-M0+ core, operates at a 64MHz clock speed, and features 32KB Flash and 8KB RAM. It integrates a multi-channel PWM timer and a 12-bit ADC, enabling efficient processing of dual-switch input signals, execution of electronic interlock logic, and precise control of the brushless motor's start, stop, and speed regulation. Its small package (TSSOP20) and low power consumption meet the design requirements of handheld power tools.

[0012] The present invention is further configured such that the push-block switch and the trigger switch are both electrically connected to the MCU microcontroller of the control component through independent wires to form a parallel circuit structure, and the MCU microcontroller integrates firmware programs.

[0013] The above technical solution utilizes a microcontroller (MCU) within the control component, implemented via firmware. The MCU continuously monitors the input signals of the two switches and follows a pre-defined interlocking state machine logic: when either switch is activated, the MCU immediately ignores the input of the other switch until the currently activated switch is released. This provides an electronic interlocking mechanism to prevent operational conflicts.

[0014] The present invention is further configured such that the motor assembly adopts a brushless motor and is electrically connected to a rechargeable lithium battery pack and an MCU microcontroller respectively through independent wires to form a series circuit structure.

[0015] The above technical solution has a rechargeable function, enabling wireless operation of the rechargeable angle grinder and providing 18V or 21V DC power to the motor.

[0016] The present invention is further configured such that the gearbox assembly consists of an output shaft and two meshing bevel gears, the two bevel gears being fixedly connected to the output end of the motor assembly and the end of the output shaft inside the housing assembly, respectively.

[0017] The above technical solution involves using a motor assembly to drive two bevel gears to mesh with each other, thereby converting axial rotation into radial rotation that is coaxial with the output shaft, and thus driving the output shaft to rotate.

[0018] The present invention is further configured such that a wiring groove is provided inside the handle assembly, and the wiring groove is filled with an insulating sleeve made of UL94 V-0 grade flame-retardant engineering plastic.

[0019] The above technical solution involves separating different conductors to avoid the risk of short circuits, while using flame-retardant materials to ensure insulation stability under high-temperature conditions.

[0020] In summary, this utility model has the following beneficial effects: 1. Through a unique dual-switch layout and optimized internal design, users can freely select the switch according to their working posture. This significantly alleviates the fatigue and space limitations of single-switch solutions. It not only improves the ease of operation but also strengthens the safety protection mechanism, thus enabling multi-posture operation. It solves the pain points of traditional rechargeable angle grinders with a single switch and has high practical value. 2. The dual switches operate independently, with no correlation between them. The microcontroller follows a preset interlocking state machine logic: when either switch is activated, the MCU immediately ignores the input of the other switch until the currently activated switch is released. This interlocking mechanism prevents operational conflicts and enhances the safety of using the rechargeable angle grinder tool. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the switch push block structure of this utility model; Figure 3 This is a schematic diagram of the installation position of the switch push block of this utility model; Figure 4 This is a schematic diagram of the installation position of the trigger switch of this utility model.

[0022] Reference numerals: 1. Gearbox assembly; 2. Housing assembly; 3. Motor assembly; 4. Switch push block; 5. Switch lever; 6. Switch; 7. Handle assembly; 8. Trigger switch; 9. Control assembly. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Example 1: refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 A rechargeable angle grinder includes a housing assembly 2 and a handle assembly 7, which are bolted together. A motor assembly 3 is bolted inside the housing assembly 2. A gearbox assembly 1 and a control assembly 9 are respectively installed on the side of the housing assembly 2 and the side away from the motor assembly 3. A push-block switch is installed at the top front of the housing assembly 2, and a trigger switch is installed at the gripping part of the handle assembly 7. Through a unique dual-switch layout and optimized internal design, users can freely select the switch according to their working posture. This significantly alleviates the fatigue and space limitations of single-switch solutions. It not only improves the ease of operation but also strengthens the safety protection mechanism, thus enabling multi-posture operation. It solves the pain point of traditional rechargeable angle grinders with a single switch and has high practical value. The two switches operate independently, with no correlation between them. The MCU microcontroller follows a preset interlocking state machine logic; when either switch is activated, the MCU immediately ignores the input of the other switch until the currently activated switch is released. This provides an interlocking mechanism to avoid operational conflicts and improve the safety of using rechargeable angle grinder tools.

[0025] refer to Figure 2 , Figure 3 , Figure 4The push-block switch consists of a push-block 4, a pull rod 5, and a switch 6. The trigger switch consists of a trigger switch 8. The push-block 4 is horizontally slidably connected to the top of the housing assembly 2. The two ends of the pull rod 5 are fixedly connected to the push-block 4 and the switch 6, respectively. A spring mechanism is installed inside the push-block 4. The switch 6 is bolted to the inside of the handle assembly 7. The trigger switch 8 is vertically slidably connected to the handle assembly 7. For both switches, clean the dust from the switch slots and check the wire insulation every 50 hours of use. Replenish the gearbox with grease every six months to ensure the stable operation of the rechargeable angle grinder.

[0026] refer to Figure 1 The control component 9 consists of a battery bracket, a rechargeable lithium battery pack, and an MCU microcontroller. The rechargeable lithium battery pack and the MCU microcontroller are connected to the handle assembly 7 via bolts on the battery bracket. The rechargeable lithium battery pack and the MCU microcontroller are electrically connected via wires. The MCU microcontroller in the control component 9 is an STMicroelectronics STM32G030F6P6. This MCU is based on an ARM Cortex-M0+ core, with a clock frequency of 64MHz, 32KB Flash and 8KB RAM, and integrates a multi-channel PWM timer and a 12-bit ADC. It can efficiently process dual-switch input signals, execute electronic interlock logic, and precisely control the start, stop, and speed adjustment of the brushless motor. Its small TSSOP20 package and low power consumption characteristics meet the design requirements of handheld power tools.

[0027] refer to Figure 1 Both push-button and trigger switches are electrically connected to the MCU microcontroller in control component 9 via independent wires, forming a parallel circuit structure. The MCU microcontroller integrates firmware. The MCU microcontroller in control component 9 implements this firmware program. It continuously monitors the input signals of the two switches and follows a preset interlocking state machine logic: when either switch is activated, the MCU microcontroller immediately ignores the input of the other switch until the currently activated switch is released. This provides an electronic interlocking mechanism to avoid operational conflicts.

[0028] refer to Figure 1 The motor assembly 3 uses a brushless motor and is electrically connected to the rechargeable lithium battery pack and the MCU microcontroller via independent wires, forming a series circuit structure. It features rechargeability, enabling wireless operation of the rechargeable angle grinder, and provides the motor with 18V or 21V DC power.

[0029] refer to Figure 1The gearbox assembly 1 consists of an output shaft and two meshing bevel gears. The two bevel gears are fixedly connected to the output end of the motor assembly 3 and the end of the output shaft inside the housing assembly 2, respectively. The motor assembly 3 drives the two bevel gears to mesh, thereby converting axial rotation into radial rotation coaxial with the output shaft, which in turn drives the output shaft to rotate.

[0030] refer to Figure 1 The handle assembly 7 has a wiring channel inside, which is filled with an insulating sleeve made of UL94 V-0 flame-retardant engineering plastic. This separates different wires to avoid the risk of short circuits, and the use of flame-retardant materials ensures insulation stability under high-temperature conditions.

[0031] Brief description of usage: When using a push-button switch, the user pushes the push-button 4 forward with their finger, which drives the switch lever 5 and switches 6, thus starting the machine. When the finger is released, the push-button 4 instantly resets via a built-in spring mechanism, turning off switches 6 and stopping the machine. When using a trigger switch, the user presses the trigger part of the trigger switch 8 with their finger to directly trigger the switch and start the machine; after releasing the press, the trigger automatically resets, and the machine stops running. For example, in car repair, tools can be held at an angle to press the trigger switch 8, avoiding fatigue; in narrow spaces such as air conditioning ducts, pushing the push-button 4 is easier to control. These two switches are essentially low-voltage, low-current signal switches, rather than on / off switches that directly control the motor power. After the switch is triggered, the generated electrical signal is immediately sent to the core control component 9. The MCU microcontroller inside the control component 9 receives the start signal from the switch. According to the received instruction, the MCU microcontroller converts the DC power supplied by the battery into three-phase timing-controllable AC power through its internal power MOSFET bridge circuit, precisely driving the motor assembly 3 to rotate. The high-speed rotational power generated by the motor assembly 3 is transmitted to the gearbox assembly 1 through the gear at the end of the rotor shaft. Finally, the power is transmitted from the output shaft inside the gearbox assembly 1, driving the grinding or cutting disc mounted thereon to rotate at high speed, thus completing the operation.

[0032] It should be noted that parts have a lifespan and can be replaced during regular maintenance when they no longer meet performance requirements. Deterioration in performance due to prolonged use of parts is not a design defect of this application.

[0033] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A rechargeable angle grinder, comprising a housing assembly (2) and a handle assembly (7), characterized in that: The housing assembly (2) and the handle assembly (7) are bolted together. The motor assembly (3) is bolted inside the housing assembly (2). The gearbox assembly (1) and the control assembly (9) are respectively installed on the side of the housing assembly (2) and the handle assembly (7) away from the motor assembly (3). A push-block switch is installed at the top front end of the housing assembly (2), and a trigger switch is installed at the grip part of the handle assembly (7).

2. The rechargeable angle grinder according to claim 1, characterized in that: The push-block switch consists of a switch push block (4), a switch lever (5), and a switch (6). The trigger switch consists of a trigger switch (8). The switch push block (4) is horizontally slidably connected to the top of the housing assembly (2). The two ends of the switch lever (5) are fixedly connected to the switch push block (4) and the switch (6) respectively. A spring mechanism is installed inside the switch push block (4). The switch (6) is bolted to the inside of the handle assembly (7). The trigger switch (8) is vertically slidably connected to the handle assembly (7).

3. The rechargeable angle grinder according to claim 1, characterized in that: The control component (9) consists of a battery bracket, a rechargeable lithium battery pack, and an MCU microcontroller. The rechargeable lithium battery pack and the MCU microcontroller are connected to the inside of the handle assembly (7) by bolts to the battery bracket. The rechargeable lithium battery pack and the MCU microcontroller are electrically connected by wires.

4. A rechargeable angle grinder according to claim 3, characterized in that: Both the push-block switch and the trigger switch are electrically connected to the MCU microcontroller of the control component (9) through independent wires to form a parallel circuit structure. The MCU microcontroller has firmware integrated inside.

5. A rechargeable angle grinder according to claim 3, characterized in that: The motor assembly (3) adopts a brushless motor and is electrically connected to the rechargeable lithium battery pack and the MCU microcontroller through independent wires to form a series circuit structure.

6. A rechargeable angle grinder according to claim 1, characterized in that: The gearbox assembly (1) consists of an output shaft and two meshing bevel gears. The two bevel gears are respectively fixedly connected to the output end of the motor assembly (3) and the end of the output shaft inside the housing assembly (2).

7. A rechargeable angle grinder according to claim 1, characterized in that: The handle assembly (7) has a wiring groove inside, and the wiring groove is filled with an insulating sleeve made of UL94 V-0 grade flame-retardant engineering plastic.

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