Electric grinding machine

Abstract

The utility model discloses an electric grinding machine. Comprising an outer shield, a heat dissipation shell, a motor and an eccentric shaft, wherein the heat dissipation shell is arranged in the outer shield and can form an air guide cavity in the outer shield; the motor is arranged in the heat dissipation shell; the eccentric shaft is arranged in the air guide cavity and is connected with the output end of the motor; the heat dissipation impeller is connected with the eccentric shaft and located in the air guide cavity, the grinding disc is located outside the air guide cavity and connected with the eccentric shaft, and a plurality of air inlets capable of being communicated with the interior of the air guide cavity are formed in the top face of the air guide cavity. A plurality of air guide channels which can communicate with the air inlet and can guide airflow outside the outer protective cover into the air guide cavity are distributed on the periphery of the heat dissipation shell, and a plurality of air outlets which communicate with the interior of the air guide cavity and can guide the airflow out of the air guide cavity are formed in the side wall of the outer protective cover; the air inlet, the air guide channel and the air outlet form a complete airflow circulation path, external cold air evenly enters the air guide cavity through the side opening and the air guide channel, hot air is exhausted from the air outlet formed in the main cover body after heat absorption, and the heat dissipation performance is improved.

Description

Technical Field

[0001] This utility model belongs to the field of grinding machine technology, specifically relating to an electric grinding machine. Background Technology

[0002] In the processing of laptop casing components, electric grinders can perform grinding, polishing, and deburring, effectively improving the flatness, smoothness, and precision of the workpiece surface. However, traditional grinders have weak heat dissipation capabilities, and overheating can easily lead to component burnout or reduced lifespan. Utility Model Content

[0003] In view of the technical problems existing in the prior art, this utility model provides an electric grinder.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An electric grinder includes an outer cover, a heat dissipation shell installed inside the outer cover and forming an air guide chamber inside the outer cover, a motor installed inside the heat dissipation shell, an eccentric shaft installed inside the air guide chamber and connected to the output end of the motor, a heat dissipation impeller connected to the eccentric shaft and located inside the air guide chamber, and a grinding disc located outside the air guide chamber and connected to the eccentric shaft. The top surface of the air guide chamber is provided with a plurality of air inlets that can communicate with the interior of the air guide chamber. The outer periphery of the heat dissipation shell is provided with a plurality of air guide channels that can communicate with the air inlets and guide airflow from outside the outer cover into the air guide chamber. The side wall of the outer cover is provided with a plurality of air outlets that communicate with the interior of the air guide chamber and can exhaust airflow to the exterior of the air guide chamber.

[0006] Furthermore, the outer protective cover includes a hollow main cover body, a plurality of support blocks fixed to the upper end of the main cover body and arranged at intervals around the axis of the main cover body, and a top plate fixed to the upper end of the plurality of support blocks. The gap between each pair of adjacent support blocks is defined as a side opening, which can communicate with the air inlet and the air guide channel.

[0007] Furthermore, the top plate is provided with a plurality of vertical mounting holes penetrating the top plate.

[0008] Furthermore, the heat dissipation housing includes a first end cap installed inside the main housing, a shell detachably connected to the upper end of the first end cap and enclosed by the support block, a plurality of fins distributed around the outer periphery of the shell and spaced apart along the height direction, and a second end cap detachably connected to the upper end of the shell. The first end cap can close the port at the upper end of the main housing to form the air guide chamber.

[0009] Furthermore, an annular positioning platform is provided at the upper end of the first end cover; a plurality of air inlets are provided through the first end cover, and the plurality of air inlets are arranged at equal intervals around the axis of the first end cover.

[0010] Furthermore, the fins extend from the outer periphery of the shell in a direction away from the shell, and an air guide channel is formed between every two adjacent fins, which can communicate with the air inlet and the side opening.

[0011] Furthermore, the second end cap is provided with a lead wire port that can communicate with the interior of the housing, and the top surface of the second end cap is provided with a plurality of air guide grooves. The air guide grooves are recessed from the top surface of the second end cap in a direction away from the top surface, and the end of the air guide groove near the fin is a free opening end.

[0012] Furthermore, the air outlet is an elongated hole arranged at equal intervals around the outer periphery of the main cover.

[0013] Furthermore, the heat dissipation impeller has a mounting position in the middle, and the eccentric shaft is detachably connected to the mounting position; the end face of the heat dissipation impeller near the air inlet has a number of blades, and the number of blades surrounds the mounting position.

[0014] Furthermore, the end of the heat dissipation impeller near the grinding disc is fixed with several spaced reinforcing ribs.

[0015] In summary, the beneficial effects of this utility model are as follows: 1. The air inlet, air guide channel (fin gap), and air outlet form a complete airflow circulation path. External cold air enters the air guide chamber evenly through the side opening and air guide channel. After absorbing heat, the hot air is symmetrically discharged from the elongated air outlets distributed around the circumference of the main cover, avoiding heat accumulation and airflow stagnation caused by excessive local pressure. The heat dissipation impeller is directly connected to the eccentric shaft of the motor, and its high-speed rotation forms a forced airflow. Through heat conduction and convection, it quickly removes heat from the motor and other components, significantly improving efficiency compared to traditional natural heat dissipation, reducing the risk of component burnout due to poor heat dissipation, and extending the service life of the equipment. 2. The fins arranged along the height direction on the outer periphery of the shell significantly increase the heat dissipation area, guide the airflow to forcibly cover the outer surface of the shell, strengthen the heat conduction path, and efficiently dissipate heat from the motor inside the shell. The air guide groove on the second end cover increases the vertical heat dissipation surface. The airflow forms turbulence in the groove, prolonging the contact time and further improving the heat conduction and convection heat dissipation effect. 3. The side openings between the outer protective cover support blocks are completely exposed straight gaps without complex curved surfaces or hidden corners. Maintenance personnel can directly use compressed air guns, brushes and other tools to reach in from the outside to clean the accumulated dust, preventing the air duct from being blocked, and making dust cleaning and maintenance simple. Attached Figure Description

[0016] Figure 1This is a structural schematic diagram of an electric grinder provided by this utility model.

[0017] Figure 2 yes Figure 1 Top view.

[0018] Figure 3 yes Figure 2 Sectional view along the AA direction.

[0019] Figure 4 This is a three-dimensional structural diagram of the outer protective cover of this utility model.

[0020] Figure 5 This is a schematic diagram of the electric grinder in this utility model without the outer protective cover.

[0021] Figure 6 This is a schematic diagram of the structure of the eccentric shaft and the heat dissipation impeller in the present invention.

[0022] Figure 7 yes Figure 6 A three-dimensional structural diagram of the heat dissipation impeller.

[0023] Figure 8 yes Figure 6 A schematic diagram of the bottom structure of the heat dissipation impeller.

[0024] In the diagram, 100-outer protective cover, 110-main cover, 111-air outlet, 112-air guide chamber, 120-support block, 121-side opening, 130-top plate, 131-mounting hole, 200-heat dissipation shell, 210-first end cover, 211-air inlet, 212-annular positioning platform, 220-shell, 230-fins, 231-air guide channel, 240-second end cover, 241-lead wire port, 242-air guide groove, 300-motor, 310-rotor limiting ring, 320-bearing, 400-eccentric shaft, 500-heat dissipation impeller, 510-blade, 520-mounting position, 530-reinforcing rib, 600-grinding disc, 700-bolt. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific figures.

[0026] Please see Figure 1 , Figure 2 and Figure 3This utility model provides an electric grinder, including an outer cover 100, a heat dissipation shell 200 installed inside the outer cover 100 and forming an air guide chamber 112 inside the outer cover 100, a motor 300 installed inside the heat dissipation shell 200, an eccentric shaft 400 installed inside the air guide chamber 112 and connected to the output end of the motor 300, a heat dissipation impeller 500 connected to the eccentric shaft 400 and located inside the air guide chamber 112, and a grinding disc 600 located outside the air guide chamber 112 and connected to the eccentric shaft 400. The motor 300 is limited within the heat dissipation shell 200 by providing rotor limiting rings 310 at both the upper and lower ends of the motor 300. The top surface of the air guide chamber 112 is provided with several air inlets 211 that can communicate with the interior of the air guide chamber 112. The outer periphery of the heat dissipation shell 200 is provided with several air guide channels 231 that can communicate with the air inlets 211 and guide the airflow outside the outer cover 100 into the air guide chamber 112. The side wall of the outer cover 100 is provided with several air outlets 111 that communicate with the interior of the air guide chamber 112 and guide the airflow out of the air guide chamber 112. External cold air is introduced into the air guide chamber 112 through the air inlet 211 via the air guide channel 231 on the outer periphery of the heat dissipation shell 200. The heat dissipation impeller 500 located in the air guide chamber 112 is directly connected to the eccentric shaft 400 at the output end of the motor 300. When the motor 300 is running, it drives the heat dissipation impeller 500 to rotate at high speed, forming a forced airflow in the air guide chamber 112. Heat is quickly carried away through heat conduction and convection. The heated air is discharged through the air outlet 111 on the side wall of the outer cover 100, forming a circulation path and preventing heat from accumulating inside. As the core component of active cooling, the heat dissipation impeller 500 accelerates airflow through mechanical drive. Compared with traditional natural cooling methods, the cooling efficiency can be greatly improved, reducing the occurrence of component burnout due to poor heat dissipation and effectively extending the service life of the machine.

[0027] Please see Figure 4 The outer protective cover 100 includes a hollow main cover 110, a plurality of support blocks 120 fixed to the upper end of the main cover 110 and spaced apart around the axis of the main cover 110, and a top plate 130 fixed to the upper end of the plurality of support blocks 120. The gap between every two adjacent support blocks 120 is defined as a side opening 121, which can communicate with the air inlet 211 and the air guide channel 231. The design of the side opening 121 can evenly distribute the external air to the corresponding air guide channel, expand the air intake area, and increase the air volume. Moreover, the side opening 121 is a completely exposed straight gap without complex curved surfaces or hidden corners, so maintenance personnel can directly use compressed air guns, brushes, and other tools to reach into the side opening 121 from the outside to clean the accumulated dust, which is convenient for dust removal and prevents blockage.

[0028] Please continue reading. Figure 4The air outlet 111 is a long strip of holes arranged at equal intervals around the outer periphery of the main cover 110, so that the hot air in the air guide chamber 112 can be discharged evenly and symmetrically from multiple directions, avoiding excessive local pressure that could cause airflow stagnation.

[0029] The top plate 130 is provided with several vertical mounting holes 131 that penetrate the top plate 130, through which the electric grinder can be installed on other mechanical equipment for use.

[0030] Please see Figure 5 The heat dissipation housing 200 includes a first end cap 210 installed inside the main housing 110, a housing 220 detachably connected to the upper end of the first end cap 210 and surrounded by a support block, a plurality of fins 230 distributed around the outer periphery of the housing 220 and spaced apart along the height direction, and a second end cap 240 detachably connected to the upper end of the housing 220. The first end cap 210 can close the port at the upper end of the main housing 110 to form an air guide chamber 112. The first end cap 210 is bolted to the main cover 110 by bolts 700. The upper end of the housing 220 is bolted to the second end cap 240 by bolts 700, and the lower end is bolted to the first end cap 210 by bolts 700. The bolt connection 700 is a rigid fixing method, and precise positioning through the bolt holes ensures that the relative positions between the heat dissipation outer shell 200 (first end cap 210, housing 220, second end cap 240) and the outer cover 100 (main cover 110, support block 120, top plate 130) are fixed. Especially for the air guide chamber 112, the precise assembly of each component ensures that the airflow path of the air inlet 211, air guide channel 231, and air outlet 111 is unobstructed.

[0031] The upper end of the first end cover 210 is provided with an annular positioning platform 212, which is used to position the housing 220 when it is installed. The mating surface of the positioning platform 212 can serve as part of the sealing structure, further preventing grinding dust from entering the heat dissipation shell 200 from the connection between the first end cover 210 and the housing 220. Both the first end cover 210 and the second end cover 240 are provided with bearings 320 for connecting to the motor 300. The bearings 320, together with the rotor limiting ring 310, stably fix the motor 300 in the heat dissipation shell 200. The bearings 320 can withstand the axial force generated when the motor 300 is running (such as the axial airflow thrust of the heat dissipation impeller 500), preventing the motor 300 from moving along the axis and ensuring the transmission accuracy between the eccentric shaft 400 and the grinding disc 600. Several air inlets 211 are provided through the first end cover 210, and are arranged at equal intervals around the axis of the first end cover 210. This allows external cold air to enter the air guide chamber 112 evenly in the circumferential direction after passing through the side opening 121 and the air guide channel 231, avoiding uneven heat dissipation caused by excessive or insufficient local air intake. The cooling impeller 500 operates in a uniform airflow, which can reduce radial force fluctuations caused by uneven airflow impact and reduce the impeller vibration amplitude.

[0032] The fins 230 protrude from the outer periphery of the shell 220 in a direction away from the shell 220. Between every two adjacent fins 230, an air guide channel 231 is formed that can communicate with the air inlet 211 and the side opening 121. The fins 230 can effectively increase the heat dissipation area. Moreover, the fins 230 are arranged along the height direction of the shell 220, which can prevent the fluid from entering the air guide chamber directly from the air inlet 211 without flowing over the outer surface of the shell 220. The design of the fins 230 being arranged along the height direction of the shell 220 and forming the air guide channel 231 can achieve efficient heat dissipation of the motor 300 inside the shell 220 by forcing airflow to cover the outer surface of the shell 220 and strengthening the heat conduction path.

[0033] The second end cover 240 is provided with a lead-in port 241 that communicates with the interior of the housing 220, for the lead-in port 241 to pass through the motor 300. The top surface of the second end cover 240 is provided with several air-guiding grooves 242. These grooves are recessed from the top surface of the second end cover 240 in a direction away from the top surface, and the end of the air-guiding groove 242 near the fins 230 is a free-opening end. The air-guiding grooves 242 are groove-shaped structures recessed downwards from the top surface of the second end cover 240, effectively adding multiple vertical heat dissipation surfaces to the end cover plane. The two side walls and the bottom surface of each groove become new heat dissipation interfaces, significantly increasing the total heat dissipation area. The airflow creates a turbulent effect within the grooves, increasing the contact time with the end cover surface and enhancing heat conduction and convection cooling.

[0034] Please see Figure 6 The cooling impeller 500 has a mounting position 520 in the middle, and the eccentric shaft 400 is snapped into the mounting position 520. A locking screw is provided on the mounting position 520 to securely connect the mounting position 520 and the eccentric shaft 400. After the cooling impeller 500 and mounting position 520 are installed, they are protected by the main cover 110. If the cooling impeller 500 breaks or wears during operation, the main cover 110 can also prevent flying debris from injuring people.

[0035] Please see Figure 7 The heat dissipation impeller 500 has several blades 510 arranged at equal intervals on the end face near the air inlet 211. The blades 510 surround the mounting position 520. The equal interval arrangement of the blades 510 can ensure that the air in each area of ​​the air inlet 211 is drawn in evenly.

[0036] Please see Figure 8 A number of spaced reinforcing ribs 530 are fixed to one end of the heat dissipation impeller 500 near the grinding disc 600. The reinforcing ribs 530 are distributed radially along the heat dissipation impeller 500, which can suppress impeller deformation and improve rigidity.

[0037] This electric grinder features: 1. A complete airflow circulation path is formed by the air inlet 211, air guide channel 231 (between fins 230), and air outlet 111. External cold air enters the air guide chamber 112 evenly through the side opening 121 and air guide channel 231. After absorbing heat, the hot air is symmetrically discharged from the elongated air outlets 111 distributed around the main housing 110, avoiding heat accumulation and airflow stagnation caused by excessive local pressure. The cooling impeller 500 is directly connected to the eccentric shaft 400 of the motor 300. High-speed rotation forms a forced airflow, which quickly removes heat from the motor 300 and other components through heat conduction and convection. Compared with traditional natural heat dissipation, the efficiency is greatly improved, reducing the risk of component burnout due to poor heat dissipation and extending the service life of the equipment. 2. The fins 230 arranged along the height direction on the outer periphery of the housing 220 significantly increase the heat dissipation area, guide the airflow to forcibly cover the outer surface of the housing 220, strengthen the heat conduction path, and efficiently dissipate heat from the motor 300 inside the housing 220. The air guide groove 242 on the second end cover 240 increases the vertical heat dissipation surface. The airflow forms turbulence in the groove, prolonging the contact time and further improving the heat conduction and convection heat dissipation effect. Third, the side opening 121 between the support blocks of the outer cover 100 is a completely exposed straight gap without complex curved surfaces or hidden corners. Maintenance personnel can directly use compressed air guns, brushes and other tools to reach in from the outside to clean the accumulated dust, preventing the air guide channel 231 from being blocked, making dust cleaning and maintenance simple.

[0038] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.

Claims

1. An electric grinder, characterized in that: The device includes an outer protective cover, a heat dissipation shell installed inside the outer protective cover and forming an air guide chamber inside the outer protective cover, a motor installed inside the heat dissipation shell, an eccentric shaft installed inside the air guide chamber and connected to the output end of the motor, a heat dissipation impeller connected to the eccentric shaft and located inside the air guide chamber, and a grinding disc located outside the air guide chamber and connected to the eccentric shaft. The top surface of the air guide chamber is provided with several air inlets that can communicate with the interior of the air guide chamber. The outer periphery of the heat dissipation shell is provided with several air guide channels that can communicate with the air inlets and guide the airflow outside the outer protective cover into the air guide chamber. The side wall of the outer protective cover is provided with several air outlets that communicate with the interior of the air guide chamber and can exhaust the airflow outside the air guide chamber.

2. The electric grinder according to claim 1, characterized in that: The outer protective cover includes a hollow main cover body, a number of support blocks fixed to the upper end of the main cover body and arranged at intervals around the axis of the main cover body, and a top plate fixed to the upper end of the number of support blocks. The gap between each pair of adjacent support blocks is defined as a side opening, which can communicate with the air inlet and the air guide channel.

3. The electric grinder according to claim 2, characterized in that: The top plate is provided with several vertical mounting holes that penetrate the top plate.

4. The electric grinder according to claim 2, characterized in that: The heat dissipation housing includes a first end cap installed inside the main housing, a shell detachably connected to the upper end of the first end cap and surrounded by the support block, a plurality of fins distributed around the outer periphery of the shell and spaced apart along the height direction, and a second end cap detachably connected to the upper end of the shell. The first end cap can close the port at the upper end of the main housing to form the air guide chamber.

5. The electric grinder according to claim 4, characterized in that: The first end cover has an annular positioning platform at its upper end; a plurality of air inlets are provided through the first end cover and are arranged at equal intervals around the axis of the first end cover.

6. The electric grinder according to claim 4, characterized in that: The fins extend from the outer periphery of the shell in a direction away from the shell, and an air guide channel is formed between every two adjacent fins, which can communicate with the air inlet and the side opening.

7. The electric grinder according to claim 6, characterized in that: The second end cap is provided with a lead wire port that can communicate with the inside of the housing. The top surface of the second end cap is provided with several air guide grooves. The air guide grooves are recessed from the top surface of the second end cap in a direction away from the top surface, and the end of the air guide groove near the fin is a free opening end.

8. The electric grinder according to claim 2, characterized in that: The air outlet is a long strip of holes arranged at equal intervals around the outer perimeter of the main cover.

9. The electric grinder according to any one of claims 1-8, characterized in that: The heat dissipation impeller has a mounting position in the middle, and the eccentric shaft is detachably connected to the mounting position; the end face of the heat dissipation impeller near the air inlet has a number of blades, and the number of blades surrounds the mounting position.

10. The electric grinder according to claim 9, characterized in that: The end of the heat dissipation impeller near the grinding disc is fixed with several spaced reinforcing ribs.

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