CN218856507U

CN218856507U - Direct-drive electric angle grinder

Info

Publication number: CN218856507U
Application number: CN202221681778.XU
Authority: CN
Inventors: 柳文; 赵乾麟; 周群; 赵屹; 叶佳宙
Original assignee: Zhejiang Cheering Sewing Machine Co ltd
Current assignee: Zhejiang Cheering Sewing Machine Co ltd
Priority date: 2022-07-02
Filing date: 2022-07-02
Publication date: 2023-04-14
Anticipated expiration: 2032-07-02

Abstract

The utility model relates to a directly drive formula electronic angle mill that constitutes by abrasive disc and main brushless motor that drives, its characterized in that the junction of aircraft nose and handle be equipped with cooling blower. Because the utility model discloses dedicated cooling blower has been add in current angle grinder, and cooling blower is direct with the outer wall that the cooling blower blows brushless motor coil, recycle the heat pipe technique and introduce the cooling blower front end with the heat source on the drive control module, realize the cooling to the drive control module, utilize intelligent technology to realize the temperature real-time detection control of main motor and the drive control module of driving, the temperature variation according to the main motor that drives provides the cooling of different intensity, the heat dissipation of the main brushless motor coil of driving has not only been guaranteed, the life of angle grinder has been improved, the noise at work of angle grinder has also been reduced effectively simultaneously.

Description

Direct-drive electric angle grinder

Technical Field

The utility model relates to an electric tool technical field especially relates to a directly drive angle mill.

Background

An electric angle grinder is a commonly used electric tool. With the progress of the brushless motor technology, the brushless motor is used for replacing a brush motor or a series motor, so that the motor directly drives the operation part, and the method becomes a direction of the progress of the angle grinder technology. The direct-drive electric angle grinder generally comprises a motor, a grinding head box, a grinding wheel, a grinding head handle and other components, wherein the grinding wheel arranged on a shaft head is driven by a main shaft of the motor to rotate to work. After the brushless motor is used for realizing the direct drive of the angle grinder, the heat dissipation effect of the motor directly influences the working efficiency of the motor, so that the heat dissipation design of the angle grinder influences the working life of the machine. The existing heat dissipation design of the angle grinder is generally to arrange a heat dissipation fan at a machine head. When the motor works, the fan works simultaneously, and cooling air is introduced from the front end or the rear end of the machine head to dissipate heat of the motor. However, when the brushless motor works, the control module of the motor needs to be cooled at the same time, so that when the brushless motor is used as the driving power of the existing angle grinder instead, the cooling system of the existing angle grinder cannot effectively provide cooling for the control module, and the working efficiency of the brushless angle grinder is reduced. In addition, when the angle grinder works, a large amount of dust is often generated, and due to the ventilation design of the existing angle grinder, the distance between an air inlet and a working part is close, so that the working dust is easy to enter a motor to damage the motor. And the tail end of the motor is provided with the fan blade, so that the cutting part of the angle grinder is directly thickened, and the application range of the angle grinder is influenced.

Chinese utility model patent 2019212021365 discloses a directly drive electronic angle mill, and this kind of angle mill is equipped with the louvre at the aircraft nose portion of casing, the tail end of handle be equipped with cooling blower, handle shell is equipped with the air intake with cooling blower's fan blade relative department, forms an inside cooling duct of organism from the air intake of handle shell tail end to the louvre of aircraft nose portion. Although the design is adopted, the cooling air duct from the air inlet at the tail end of the handle to the heat dissipation holes at the head end is arranged in the angle grinder, and the special cooling fan arranged at the tail end of the handle provides heat dissipation air, so that the cooling of the control module arranged in the middle of the handle is ensured, and the probability that dust generated by the working part enters the motor is reduced due to the fact that the distance between the air inlet and the working mechanism is increased. However, the cooling fan is arranged at the tail end of the handle, the cooling efficiency of the fan on the outer wall of the motor is reduced to some extent due to the overlong heat dissipation air duct, and if the power of the cooling fan is increased, the problem of overlarge noise of the fan can be caused.

Disclosure of Invention

Technical defect to current angle mill existence, the utility model discloses a change the cooling system of current angle mill to solve the cooling of drive control module of brushless angle mill and the stator coil's of motor heat dissipation problem effectively.

The utility model discloses a realize through following mode: the utility model provides an electronic angle of straight formula mill, includes aircraft nose and handle, the aircraft nose is including the head that is equipped with the abrasive disc and main brushless motor that drives, main brushless motor that drives sets up inside the aircraft nose, main brushless motor's that drives main direct being connected with the abrasive disc of main spindle is used for driving the abrasive disc and rotates the handle in have brushless motor's control module, its characterized in that the junction of aircraft nose and handle be equipped with cooling blower, the cooling blower front end is direct to driving the brushless motor outer wall in the face of, the outer wall of aircraft nose is equipped with the air outlet, establishes the air intake on the handle, forms the cooling air duct that passes through fan to brushless motor outer wall from the handle.

Furthermore, the connection end of the machine head and the handle is provided with a heat pipe socket, the control module of the brushless motor is arranged at the rear end of the cooling fan, the two sides of the control module of the brushless motor are provided with heat pipes, one end of each heat pipe is arranged on a heat dissipation plate on the control module, and the other end of each heat pipe is inserted into the heat pipe socket on the machine head.

Furthermore, the connection part of the machine head and the handle is provided with a cooling fan motor seat, an air inlet tunnel cavity and a motor chamber are arranged on the cooling fan motor seat, the motor of the cooling fan is arranged in the motor chamber, and the air inlet tunnel cavity is in butt joint with an air inlet on the handle.

Furthermore, the cooling fan is driven by a high-speed brushless motor, a temperature sensor is arranged on the main drive brushless motor and is associated with a control module of the brushless motor,

furthermore, a temperature sensor is arranged in the coil pack of the main drive brushless motor, and the temperature sensor is associated with a control module of the brushless motor of the cooling fan.

Further, a temperature sensor is arranged on the shell wall of the main drive brushless motor, and the temperature sensor is associated with a control module of the brushless motor.

Furthermore, the control module comprises two motor driving circuits for respectively driving the main drive brushless motor and the cooling fan motor to work, wherein a temperature sensor is arranged on a heat sink of an IGBT module in the brushless motor control module for controlling the main drive brushless motor to work, and the temperature sensor is associated with a driving circuit of the cooling fan in the brushless motor control module.

Because the utility model discloses dedicated cooling blower has been add in current angle grinder, and cooling blower is direct with the outer wall that the cooling blower blows brushless motor coil, recycle the heat pipe technique and introduce the cooling blower front end with the heat source on the control module, realize the cooling to control module, utilize intelligent technology to realize main temperature real-time detection control of driving motor and control module, the temperature variation according to main motor that drives provides the cooling of different intensity, the heat dissipation of main brushless motor coil of driving has not only been guaranteed, the life of angle grinder has been improved, the noise at work of angle grinder has also been reduced effectively simultaneously.

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

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the bottom structure of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic structural view of a handpiece housing;

FIG. 5 is a schematic structural view of a motor base of the cooling fan;

fig. 6 is a schematic cross-sectional view of embodiment 2 of the present invention;

fig. 7 is a schematic diagram of a control circuit module of the present invention.

In the figure: 1. A machine head; 2. a handle; 3. A cooling fan; 4. a heat pipe; 5. a control module; 6. cooling a motor base of the fan; 7. a temperature sensor 7; 11. a heat dissipation window; 12. a heat pipe socket; 21. an air inlet; 61. an air intake tunnel cavity; 62. a motor chamber.

Detailed Description

Example 1: as shown in fig. 1, 2 and 3, a direct-drive electric angle grinder comprises a machine head 1 and a handle 2, wherein a main drive brushless motor is arranged in a machine shell 1, and a main shaft of the main drive brushless motor is directly connected with grinding plates to drive the grinding plates to rotate.

The structure of the machine head 1 is as shown in fig. 4, a cylinder for installing the main drive brushless motor is arranged in the machine head, and a stator of the main drive brushless motor is pressed into the cylinder, so that the integration of the main drive brushless motor and the machine shell is realized.

A heat radiation window 11 is arranged on the shell wall of the machine head 1, and a heat pipe socket 12 is arranged at the connecting end of the machine head 1 and the handle 2.

The handle 2 of electronic angle mill is connected to casing 1 open end, sets up brushless motor's control module 5 in the handle 2, provides control signal and drive power supply to the motor of main drive brushless motor and cooling blower 3 by this control module 5. Two heat pipes 4 are arranged on a radiating fin on the control module 5, and the other ends of the heat pipes 4 are inserted into a heat pipe socket 12 at the end of the machine head 1.

As shown in fig. 3, a cooling fan 3 is disposed at the joint of the handpiece 1 and the handle 2, the cooling fan 3 is disposed in a motor chamber 62 of a cooling fan motor base as shown in fig. 5, and the blades of the cooling fan 3 face the housing of the main drive brushless motor.

Be equipped with air inlet tunnel chamber 61 and motor room 62 on the cooling blower motor cabinet, the motor of cooling blower 3 just sets up in motor room 62, and air inlet tunnel chamber 61 docks with air intake 21 on the handle 2.

A gap is arranged between the front end of the motor chamber and the rear part of the fan blade of the cooling fan 3. Therefore, air can enter the fan blade from the air inlet 21 on the handle 2 and a gap between the motor of the cooling fan 3 and the fan blade, and then is sent to the outer wall of the main drive brushless motor and the tail end of the heat pipe 4 by the fan blade, so that the main drive brushless motor and the heat pipe 4 are cooled.

When the angle grinder works, the cooling fan 3 arranged in the handle 2 works simultaneously, and the cooling fan 3 can suck cold air from the air inlet 21 on the handle 2 because the brushless motor generates heat under the overload condition. After entering the air inlet 21, the cold air flows through the air inlet tunnel 61 of the motor base and the gap between the front end of the motor chamber 62 and the fan blade of the cooling fan 3, and is forcibly sent to the outer wall of the main drive brushless motor in the machine head 1 by the fan blade, so that the main drive brushless motor is cooled.

Example 2: as shown in fig. 5, a temperature collection point is arranged in a coil pack of a main drive brushless motor of the direct-drive electric angle grinder and on a heat sink of an IGBT module in the drive control module, a thermistor is used as a temperature sensor 7, and the control module 5 arranged in the shell of the handle 2 is a two-way control system and respectively takes on the functions of driving the main drive brushless motor and the cooling fan 3.

A temperature sensing data conversion circuit is arranged in a control module 5 of a motor of the cooling fan 3, temperature parameters of an IGBT module in a driving main drive brushless motor and a driving control module, which are acquired by a temperature sensor 7, are input into the control module 5, and the control module 5 performs data processing conversion to control the rotating speed of the motor of the cooling fan 3.

The heating source on the control module 5 is mainly a power tube, and the temperature on the power tube is conducted to the heat sink, that is, the heat tube 4 conducts the temperature to the front end of the heat tube 4. Because the contact end of the heat pipe 4 and the power pipe radiating fin is a heating section, and the front end of the fan blade of the cooling fan 3 is a cooling section, after the power pipe generates heat, the working liquid in the pipe core of the heat pipe 4 is heated and evaporated, and the heat is taken away, the heat is the evaporation latent heat of the working liquid, the steam flows to the condensation section of the heat pipe 4 from the central channel, when the cooling fan 3 cools the main drive brushless motor, the heat pipe 4 is also cooled forcibly, the steam is condensed into liquid, and the latent heat is released at the same time, and under the action of capillary force, the liquid flows back to the evaporation section, so that the cooling of the control module 5 is realized.

When the angle grinder works under load, the temperature of the motor coil rises or the temperature of the IGBT module in the control module 5 rises. When the temperature rises to a set threshold value, the temperature sensor 7 can send a signal to the control module 5, the control module 5 starts the motor of the cooling fan 3 to work, and after the control module 5 can calculate through the temperature sensing signal, the control module 5 carries out variable speed control on the rotating speed of the motor of the cooling fan 3 so as to prevent the over-speed and unnecessary fan noise.

Claims

1. The utility model provides a directly drive electronic angle mill, includes aircraft nose and handle, the aircraft nose is including the head that is equipped with the abrasive disc and mainly drives brushless motor, mainly drive brushless motor and set up inside the aircraft nose, just mainly drive brushless motor's main shaft and directly be connected with the abrasive disc and be used for driving the abrasive disc and rotate the handle in be equipped with brushless motor's control module, its characterized in that: the connection of aircraft nose and handle be equipped with cooling blower, cooling blower is direct to the outer wall of mainly driving brushless motor coil, the outer wall of aircraft nose is equipped with the air outlet, establishes the air intake on the handle, forms the cooling duct that passes through the outer wall of fan to brushless motor coil from the handle.

2. The direct drive electric angle grinder of claim 1, wherein: the aircraft nose and handle link be equipped with the heat pipe socket, brushless motor's control module set up in cooling blower rear end, brushless motor's control module's both sides are equipped with the heat pipe, the one end of heat pipe is installed on the heating panel on control module, the other end is inserted on the heat pipe socket on the aircraft nose.

3. The direct drive electric angle grinder of claim 1, wherein: the connection part of the machine head and the handle is provided with a cooling fan motor seat, an air inlet tunnel cavity and a motor chamber are arranged on the cooling fan motor seat, the motor of the cooling fan is arranged in the motor chamber, and the air inlet tunnel cavity is in butt joint with an air inlet on the handle.

4. The direct drive electric angle grinder of claim 1, wherein: the cooling fan is driven by a high-speed brushless motor, a temperature sensor is arranged on the main drive brushless motor, and the temperature sensor is associated with a control module of the brushless motor.

5. The direct drive electric angle grinder of claim 4, wherein: a temperature sensor is arranged in a coil pack of the main drive brushless motor and is associated with a control module of the brushless motor.

6. The direct drive electric angle grinder of claim 4, wherein: a temperature sensor is arranged on the shell wall of the main drive brushless motor and is associated with a control module of the brushless motor.

7. The direct drive electric angle grinder of claim 1, wherein: the control module of the brushless motor comprises a driving circuit of a main drive motor and a driving circuit of a cooling fan motor, and the driving circuits respectively drive the main drive brushless motor and the cooling fan motor to work, wherein a temperature sensor is arranged on a radiating fin of an IGBT module which controls the main drive brushless motor to work in the control module of the brushless motor, and the temperature sensor is associated with the driving circuit of the cooling fan in the drive control module.