Power tool

Abstract

The present application relates to a kind of electric tools, including shell, drive assembly and fan, fan is installed in the front side of drive assembly, shell includes the main casing containing drive assembly and the main handle connected to the upper end of main casing, drive assembly includes the first motor housed in main casing and the controller connected to the first motor;Main handle has the duct connected to main casing and the heating zone connected to duct, main handle includes the adjusting device installed in duct and the detection device installed in heating zone, detection device detects the signal parameter of heating zone and feedback to controller, controller will signal parameter process generation control signal, adjusting device controls the passage area of duct according to control signal.The present application is realized by setting adjusting device and detection device in main handle, to realize automatic constant temperature control, simple structure, and no artificial operation is needed.

Description

Technical Field

[0001] This invention relates to a power tool, and more particularly to a power tool with automatic temperature control. Background Technology

[0002] Power tools such as angle grinders, grooving machines, and cutting machines are driven by a motor and a reduction gear, which rotates the output shaft. A saw blade can be optionally mounted on the output shaft to cut or groove the workpiece. When these power tools operate outdoors, they generate a large amount of heat dissipation airflow. In cold conditions, this airflow can be directed into the handle to improve user comfort. However, in hot weather, there is no need to direct heat dissipation airflow into the handle. Therefore, effectively managing the heat dissipation airflow generated by power tools is a pressing problem that needs to be solved.

[0003] Therefore, it is indeed necessary to provide a power tool to overcome the shortcomings of the existing technology. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an electric tool with a simple structure and automatic constant temperature control.

[0005] The present invention addresses the problems of existing technologies by adopting the following technical solution: An electric tool includes a housing, a drive assembly installed within the housing, and a fan driven by the drive assembly. The fan is installed on the front side of the drive assembly. The housing includes a main housing accommodating the drive assembly and a main handle connected to the upper end of the main housing. The drive assembly includes a first motor accommodating the main housing and a controller connected to the first motor. The main handle has a pipe communicating with the main housing and a heating zone connected to the pipe. The main handle includes an adjustment device installed on the pipe and a detection device installed on the heating zone. The detection device detects signal parameters of the heating zone and feeds them back to the controller. The controller processes the signal parameters to generate a control signal. The adjustment device controls the passage area of ​​the pipe according to the control signal.

[0006] A further improvement is as follows: the adjustment device includes a second motor installed on the main handle and an adjustment component connected to the second motor, wherein the second motor drives the adjustment component to perform reciprocating motion.

[0007] A further improvement is as follows: the detection device includes a sensor located in the heating zone and a first wire installed inside the main handle. One end of the first wire is connected to the sensor, and the other end is connected to the controller. The first wire extends outside the pipe.

[0008] A further improvement is as follows: the sensor is configured as a temperature sensor, the signal parameter is configured as the temperature of the heating zone detected by the temperature sensor, and the sensor is located in the middle of the heating zone.

[0009] A further improvement is as follows: the main handle has a straight handle mounted on the main housing and a crank integrated into the straight handle; the pipe has a first section mounted on the straight handle and a second section mounted on the crank, the second section being connected to the first section.

[0010] A further improvement is as follows: the adjustment component includes a rotating part connected to the second motor and an operating part connected to the rotating part. The rotating part drives the operating part to move within the pipe to adjust the passage area of ​​the first section.

[0011] A further improvement is as follows: the rotating part is configured as a helical rod, and the interior of the operating part is configured as a helical cavity corresponding to the helical rod. The helical rod converts the rotation of the second motor into the up-and-down reciprocating motion of the operating part.

[0012] A further improvement is as follows: the operating part has a movable member mounted on the first section and a protrusion extending radially from the movable member, the first section has a recessed portion radially recessed from the inner wall, and the protrusion is engaged with the recessed portion.

[0013] A further improvement is as follows: the second motor is configured as a stepper motor, and the control signal is configured as a pulse signal received by the stepper motor.

[0014] A further improvement is that the detection device also has a second wire installed on the main handle, one end of which is connected to the second motor and the other end is connected to the controller.

[0015] Compared with existing technologies, this invention has the following advantages: By incorporating an adjustment device and a detection device in the main handle, the detection device detects signal parameters of the heating zone and feeds them back to the controller. The controller processes the signal parameters to generate a control signal, and the adjustment device controls the passage area of ​​the pipe according to the control signal, thereby achieving automatic constant temperature control. The structure is simple and requires no manual operation. Specifically, the detection device has a temperature sensor, and the second motor of the adjustment device is a stepper motor. The temperature of the heating zone detected by the temperature sensor is fed back to the controller, which outputs a pulse signal to the stepper motor, thereby controlling the passage area of ​​the pipe, increasing or decreasing the flow rate of the cooling airflow, and precisely adjusting the temperature of the main handle to achieve automatic constant temperature regulation. Furthermore, the rotating part is a screw rod, and the interior of the operating part has a corresponding helical cavity. The screw rod converts the rotation of the second motor into the reciprocating up-and-down motion of the operating part. Through this simple structure, the passage area of ​​the pipe is adjusted. Attached Figure Description

[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the power tool of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the power tool shown;

[0019] Figure 3 yes Figure 2 An exploded view of part of the structure of the power tool shown.

[0020] Figure 4 yes Figure 3 The diagram shows the structure of the operating part of the power tool.

[0021] Figure 5 yes Figure 4 A cross-sectional schematic diagram of the operating section of the power tool shown.

[0022] Figure 6 yes Figure 3 A cross-sectional schematic diagram of the rotating part of the power tool being connected to the operating part.

[0023] Figure 7 yes Figure 3 The diagram shows a power tool with its adjustment device installed on a pipe.

[0024] Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the power tool's conduit at the maximum passage area.

[0025] Figure 9 yes Figure 8 The diagram shows a cross-sectional view of the power tool's conduit at the minimum passage area. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0028] Please see Figures 1 to 3As shown, the embodiments of the present invention relate to a power tool 100, which mainly refers to an angle grinder, a cutting machine, a grooving machine, etc., and the power tool 100 has a handle for easy operation by the user. The handle can be built into the machine housing itself or an auxiliary handle. In this embodiment, the power tool is preferably a grooving machine. The grooving machine 100 includes a housing 1, a drive assembly 2 installed in the housing 1, a fan 3 driven by the drive assembly 2, and a cutting device 4 installed at the front end of the housing 1. The fan 3 is installed on the front side of the drive assembly 2. The housing 1 includes a main housing 11 that houses the drive assembly 2 and a main handle 12 connected to the upper end of the main housing 11. The drive assembly 2 includes a first motor 21 housed in the main housing and a controller 22 connected to the first motor 21. A cutting saw blade 41 is installed on the cutting device 4. Under the action of the drive source, the grooving machine 100 drives the first motor 21 to rotate, and transmits the rotation to the cutting device 4 via the output shaft 211 of the first motor 21, driving the cutting saw blade 41 to perform grooving operations.

[0029] The main housing 11 includes an air inlet 10, which is located at the controller 22. The fan 3 rotates to generate a cooling airflow that enters from the air inlet 10, thereby dissipating the heat generated by the first motor 21 and the controller 22. In this embodiment, the fan 3 is preferably, but not limited to, a centrifugal fan.

[0030] Please see Figure 2 and Figure 3 As shown, the main housing 11 also includes a first air outlet 20 located at the front end of the fan 3 and a second air outlet 30 located at the rear end of the controller 22. A capacitor 23 is provided at the rear end of the controller 22 on the main housing 11. A positioning rib 111 protrudes from the main housing 11 on which the capacitor 23 is installed. The positioning rib 111 not only enables the capacitor 23 to be fixed on the main housing 11, but also divides the space of the main housing 11, so that the air inlet 10 and the air outlet 30 do not interfere with each other, and the space is used more rationally.

[0031] In this embodiment, the air inlet 10 and the first air outlet 20 form a first air duct, and the air inlet 10 and the second air outlet 30 form a second air duct. The first and second air ducts are independently configured. It should be noted that the independent configuration of the first and second air ducts means that when the grooving machine 100 is performing grooving operations, the overall temperature rises significantly. The cooling airflow generated by the air inlet 10 to dissipate heat from the drive assembly 2 is split by the centrifugal fan 3. Part of the airflow flows out through the first air duct to achieve cooling, while the other part enters the pipe 121 and is transmitted to the heating zone 122 to achieve the heating function of the main handle 12. With this configuration, the two air ducts are independent and do not interfere with each other.

[0032] A through-hole vent 111 is provided on the main housing 11 near the fan 3. The main handle 12 has a pipe 121 connected to the vent 111 and a heating zone 122 connected to the pipe. The cooling airflow enters the pipe 121 through the vent 111 and then flows to the heating zone 122. With the above configuration, the user's operating comfort is improved and the work efficiency is greatly enhanced when performing grooving operations in cold conditions.

[0033] The main handle 12 includes a support portion 120 protruding from its inner wall, and a pipe 121 is installed in the support portion 120. This arrangement secures the pipe 121 within the inner cavity of the main handle 12, allowing for directional airflow to the heating zone 122 and reducing heat loss. Furthermore, the support portion 120 may have a groove to hold the first wire 202 and the second wire 203 laid within the main handle 12, ensuring neat wiring and preventing wire tangling.

[0034] The heating zone 122 has air duct ribs 151 protruding from its inner wall. These ribs 151 are spaced apart and staggered, dividing the heating zone 122 into multiple small cavities. This allows the passing heat dissipation airflow to fully and evenly contact the inner wall of the main handle 12. The arrangement of multiple sets of air duct ribs 151 forms a labyrinthine loop, increasing the residence time of the heat dissipation airflow in the heating zone 122. By utilizing thermal conductivity, heat is transferred to the surface of the main handle 12, improving operating comfort while keeping the main handle 12 dry.

[0035] The main handle 12 has a pipe 121 connected to the main housing 11 and a heating zone 122 connected to the pipe 121. The main handle 12 includes an adjustment device 10 installed on the pipe 121 and a detection device 20 installed on the heating zone 122. The detection device 20 detects the signal parameters of the heating zone 122 and feeds them back to the controller 22. The controller 22 processes the signal parameters to generate a control signal. The adjustment device 10 controls the passage area of ​​the pipe 121 according to the control signal.

[0036] The detection device 20 includes a sensor 201 located in the heating zone 122 and a first wire 202 installed inside the main handle 12. One end of the first wire 202 is connected to the sensor 201, and the other end is connected to the controller 22. The first wire 202 extends outside the pipe 121. It should be noted that the first wire 202 is arranged on the outside of the pipe 121, and the two do not contact each other, to avoid heat flow in the pipe 121 from conducting heat to the first wire 202, thereby improving its service life.

[0037] Sensor 201 is configured as a temperature sensor, and the signal parameter is configured as the temperature of the heating zone 122 detected by the temperature sensor 201. Sensor 201 is located in the middle 1221 of the heating zone 122. It should be noted that multiple sensors 201 can be set in the heating zone 122 for more precise control of the temperature in the main handle 12 held by the user. In this embodiment, one sensor 201 is installed, and it is preferably located in the middle 1221 of the heating zone 122.

[0038] Please see Figures 3 to 9 As shown, the adjustment device 10 includes a second motor 101 mounted on the main handle 12 and an adjustment component 102 connected to the second motor 101. The second motor 101 drives the adjustment component 102 to perform reciprocating motion.

[0039] The main handle 12 has a straight handle 123 mounted on the main housing 11 and a crank 124 integrated into the straight handle 123. The pipe 121 has a first section 1211 mounted on the straight handle 123 and a second section 1212 mounted on the crank 124. The second section 1212 is connected to the first section 1211, forming a three-way port 120A, 120B, and 120C. One end 120A of the three-way port is connected to the air vent 111, one end 120B is connected to the adjustment component 102, and one end 120C is connected to the heating zone 122, forming the entire flow path of the heat dissipation airflow.

[0040] The second motor 101 is installed in the straight handle 123. The space inside the main handle 12 is utilized efficiently and cleverly arranged, without increasing the overall size of the machine.

[0041] The second motor 101 is configured as a stepper motor 101, and the control signal is configured as a pulse signal received by the stepper motor 101. It should be noted that when the temperature of the main handle 12 exceeds or falls below the preset temperature, the temperature sensor 201 feeds back the parameters of the heating zone 122 to the controller 22. After processing, the controller 22 outputs a pulse signal to the stepper motor 101 within the straight handle 123. The rotor of the stepper motor 101 then rotates by an angle, and its output angular displacement is proportional to the number of input pulses, which is controlled by the controller 22. Through the above settings, the temperature of the main handle 12 of the grooving machine 100 can be automatically and consistently controlled without manual operation, offering high convenience.

[0042] The adjustment component 102 includes a rotating part 102a connected to the second motor 101 and an operating part 102b connected to the rotating part 102a. The rotating part 102a drives the operating part 102b to move within the pipe 121 to adjust the passage area of ​​the first section 1211, control the flow rate of hot air within the pipe 121, adjust the temperature of the main handle 12, and improve the user's grip comfort.

[0043] The detection device 20 also has a second wire 203 installed on the main handle 12, one end of which is connected to the second motor 101 and the other end is connected to the controller 22.

[0044] The rotating part 102a is configured as a helical rod, and the interior of the operating part 102b is configured as a helical cavity 1020 corresponding to the helical rod 102a. The helical rod 102a converts the rotation of the second motor 101 into the up-and-down reciprocating motion of the operating part 102b. It should be noted that the helical rod 102a and the helical cavity 1020 are in clearance fit, converting rotation into sliding, thereby controlling the forward or backward movement of the operating part 102b within the pipe 121. This allows for control of the passage area of ​​the pipe 121, thereby increasing or decreasing the flow rate of hot air. When the temperature sensor 201 detects that the temperature inside the main handle 12 is significantly lower than the preset temperature, the helical rod 102a moves the operating part 102b upward to the maximum passage area of ​​the pipe 121 (e.g., the maximum passage area of ​​the pipe 121). Figure 8 As shown), the heat dissipation air is transmitted to the heating zone 122 to regulate the temperature of the main handle 12; when the temperature sensor 201 detects that the temperature inside the main handle 12 is much higher than the preset temperature, the screw rod 102 drives the operating part 102b to move down to the minimum passage area of ​​the pipe 121 (as shown). Figure 9 As shown in the figure, the cooling airflow flows out from the first air outlet 20.

[0045] For details, please refer to Figures 4 to 6 As shown, the operating part 102b has a movable member 1021 mounted on the first section 1211 and a protrusion 1022 extending radially from the movable member 1021. The first section 1211 has a recess 121a recessed radially from its inner wall, and the protrusion 1022 is engaged with the recess 121a. It should be noted that the structural characteristics of the protrusion 1022 and the recess 121a restrict the rotational freedom of the operating part 102b, allowing it to slide within the first section 1211. Furthermore, the operating part 102b can preferably be, but is not limited to, a wooden plug structure, which has a certain sealing performance and reduces the loss of heat dissipation airflow.

[0046] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative power tools can be developed without departing from the principles and scope of this invention. The scope of protection of this invention is defined by the claims.

Claims

1. A power tool, comprising a housing, a drive assembly mounted within the housing, and a fan driven by the drive assembly, the fan being mounted on the front side of the drive assembly; the housing comprising a main housing accommodating the drive assembly and a main handle connected to the upper end of the main housing; the drive assembly comprising a first motor accommodating the main housing and a controller connected to the first motor; characterized in that: The main handle has a pipe connected to the main housing and a heating zone connected to the pipe. The main handle includes an adjustment device installed on the pipe and a detection device installed on the heating zone. The detection device includes a wire installed to the main handle, one end of which is connected to the adjustment device and the other end of which is connected to the controller. The detection device detects the signal parameters of the heating zone and feeds them back to the controller. The controller processes the signal parameters to generate a control signal. The adjustment device controls the passage area of ​​the pipe according to the control signal.

2. The power tool according to claim 1, characterized in that: The adjustment device includes a second motor mounted on the main handle and an adjustment component connected to the second motor, wherein the second motor drives the adjustment component to perform reciprocating motion.

3. The power tool according to claim 2, characterized in that: The detection device includes a sensor located in the heating zone and a first wire installed inside the main handle. One end of the first wire is connected to the sensor, and the other end is connected to the controller. The first wire extends outside the pipe.

4. The power tool according to claim 3, characterized in that: The sensor is configured as a temperature sensor, and the signal parameter is configured as the temperature of the heating zone detected by the temperature sensor. The sensor is located in the middle of the heating zone.

5. The power tool according to claim 3, characterized in that: The main handle has a straight handle mounted on the main housing and a crank integrated into the straight handle. The pipe has a first section mounted on the straight handle and a second section mounted on the crank, the second section being connected to the first section.

6. The power tool according to claim 5, characterized in that: The adjustment assembly includes a rotating part connected to the second motor and an operating part connected to the rotating part. The rotating part drives the operating part to move within the pipe to adjust the passage area of ​​the first section.

7. The power tool according to claim 6, characterized in that: The rotating part is configured as a helical rod, and the interior of the operating part is configured as a helical cavity corresponding to the helical rod. The helical rod converts the rotation of the second motor into the up-and-down reciprocating motion of the operating part.

8. The power tool according to claim 7, characterized in that: The operating part has a movable member mounted on the first section and a protrusion extending radially from the movable member. The first section has a recessed portion radially recessed from its inner wall, and the protrusion engages with the recessed portion.

9. The power tool according to claim 2, characterized in that: The second motor is configured as a stepper motor, and the control signal is configured as a pulse signal received by the stepper motor.

10. The power tool according to claim 2, characterized in that: The wire is the second wire, and one end of the second wire is connected to the second motor.

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