Polishing machine with good balance

Abstract

The utility model discloses a polisher with good balance, which comprises a shell, a motor and a polishing disk, the shell comprises a handle, a front shell fixed at the front end of the handle and a rear shell fixed at the rear end of the handle, the motor is arranged in the front shell and used as a power source, the polishing disk is arranged below the front shell and connected with the motor, and the polishing disk is connected with the motor. The circuit board assembly is arranged in the rear shell, the weight of the motor and the weight of the polishing disc on the front portion are balanced through the weight of the rear circuit board assembly, the balance of mass distribution of the polishing machine is greatly improved, the hand-held polishing machine can show better balance when used, the arm fatigue feeling of an operator is effectively relieved, and the working efficiency and quality are improved; and the circuit board assembly, the motor and the polishing disc are arranged in a front-back separated mode, high temperature accumulated in the working process can be reduced, and the risk that components such as the internal motor or the circuit board assembly are damaged due to too high temperature is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a polishing machine, especially a polishing machine with good balance. BACKGROUND

[0002] The polishing machine is a kind of electric tool that utilizes motor to drive transmission mechanism and drives polishing work unit connected on output shaft to carry out working operation.It removes surface pollution, oxidation layer and shallow mark and other defects by the friction between high-speed rotating polishing disc and surface to be polished, and obtains bright and smooth surface.

[0003] For example, the polishing machine disclosed in Chinese utility model patent CN207027196U includes: polishing pad, which has polishing surface and can polish target surface to be polished;Motor housing, which contains motor acting as driving source of polishing pad;Handle housing, which is arranged at rear side of motor housing and is used for being gripped by hand of user;Gear housing, which is arranged at front side of motor housing, and gear housing contains transmission mechanism for transmitting power of motor to polishing pad, and controller is arranged at joint of handle housing and motor housing, controller can be electrically connected to motor by power line and can control power supply to motor.

[0004] The existing polishing machine has the following problems: motor, transmission mechanism and polishing disc are arranged at front side of handle, circuit board assembly for control is arranged at joint of handle housing and motor housing, circuit board includes PCB and heat dissipation module, heat dissipation module is generally made of aluminum alloy and has large weight (actual weight is nearly one jin), the structure layout makes weight at front side of handle of polishing machine much larger than weight at rear side of handle, which makes front and rear weight distribution of polishing machine uneven, and affects handheld balance, when operator holds polishing machine for a long time, arm fatigue is easily caused, and then polishing quality is affected, in addition, control circuit board assembly and motor are arranged together, heat generated during work is accumulated together and has high temperature, so that motor or circuit board components are damaged due to overheat. UTILITY MODEL CONTENTS

[0005] Based on the above problems that motor, transmission mechanism and polishing disc are arranged at front side of handle, circuit board assembly for control is arranged at joint of handle housing and motor housing, and the structure layout makes weight at front side of handle of polishing machine much larger than weight at rear side of handle, which makes front and rear weight distribution of polishing machine uneven and affects handheld balance, the utility model provides a polishing machine with good balance.

[0006] The utility model discloses a technical scheme that solves the above technical problem is adopted: the good balance of polishing machine, including casing, motor and polishing disc, the casing includes handle, the front casing of being fixed to the front end of handle, the rear casing of being fixed to the rear end of handle, the motor sets up in the front casing for as power supply, the polishing disc sets up the below of front casing, and the polishing disc is coupled with the motor, be equipped with circuit board assembly in the rear casing.

[0007] The utility model further preferably discloses a technical scheme: the rear casing protrudes from the side wall of the handle.

[0008] The utility model further preferably discloses a technical scheme: the front casing includes the casing and head shell, the casing is fixed to the front end of handle, the head shell is fixed to the front side of casing, the motor is installed in the casing, the head shell is equipped with output shaft, and the polishing disc is connected on the output shaft, the head shell is equipped with the transmission mechanism of the motor shaft of coupling motor and output shaft.

[0009] The utility model further preferably discloses a technical scheme: the first air inlet of being located at the rear side of motor is equipped on the front end of handle or casing, the heat dissipation fan of being located at the front side of motor is connected on the motor shaft of motor, and the first air outlet opposite heat dissipation fan is equipped on the side wall of casing, to form the first heat dissipation air path that enters from the first air inlet, passes through the casing and discharges from the first air outlet.

[0010] The utility model further preferably discloses a technical scheme: the first heat dissipation hole of the heat that circuit board assembly generates is equipped on the rear casing.

[0011] The utility model further preferably discloses a technical scheme: the second air inlet is equipped on the rear casing, the heat dissipation fan of being located at the front side of motor is connected on the motor shaft of motor, and the first air outlet opposite heat dissipation fan is equipped on the side wall of casing, to form the second heat dissipation air path that enters the inside of rear casing from the second air inlet, passes through handle and enters the inside of casing, and discharges from the first air outlet.

[0012] The utility model further preferably discloses a technical scheme: the heat dissipation fan of being located at the front side of motor is connected on the motor shaft of motor, and the intermediate cover is equipped between casing and head shell, and the second air outlet opposite heat dissipation fan is equipped on the intermediate cover, the third air inlet is equipped on the head shell, and the through hole of intercommunication of second air outlet and third air inlet is equipped on the intermediate cover, to form the third heat dissipation air path between third air inlet and second air outlet.

[0013] The utility model further preferably discloses a technical scheme: the power cord is fixed on the rear casing, and the power cord is electrically connected with circuit board assembly, and the control switch is arranged on the handle.

[0014] The further preferred technical scheme of the utility model is: the front part of the shell is provided with a cover shell covering the outside of the head shell, and a forward protruding gripping part is formed on the cover shell.

[0015] The further preferred technical scheme of the utility model is: the holding center line of the handle is perpendicular or substantially perpendicular to the axis of the output shaft.

[0016] Compared with the prior art, the utility model has the advantages that the motor and the polishing disc are arranged at the front part of the handle, the circuit board assembly is arranged at the hand part of the handle, the weight of the rear circuit board assembly balances the weight of the motor and the polishing disc at the front part, the balance of the mass distribution of the polishing machine is greatly improved, the hand-held polishing machine can perform better balance during use, the arm fatigue of the operator is effectively reduced, the work efficiency and quality are improved, the circuit board assembly, the motor and the polishing disc are arranged in front and back, the temperature accumulated during work can be reduced, and the risk of damage of internal components such as the motor or the circuit board assembly due to excessively high temperature is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described in detail below in combination with the drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as a limitation on the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 It is a structural schematic view of the patent;

[0019] Figure 2 It is a sectional view of the patent;

[0020] Figure 3 It is Figure 2 the local enlarged view of A;

[0021] Figure 4 It is the split view of the left and right half shells of the handle and the rear shell;

[0022] Figure 5 It is the split view of the cover shell and the head shell;

[0023] Figure 6 It is the structural schematic view of the heat dissipation fan Figure 1 ;

[0024] Figure 7 It is the structural schematic view of the heat dissipation fan Figure 2 ;

[0025] Figure 8 It is a structural schematic view of a auxiliary handle mounted on the head shell;

[0026] Figure 9 Another auxiliary handle structure mounted on the head shell.

[0027] In the figure: 1, the shell; 2, the rear shell; 3, the handle; 4, the front shell; 5, the cover; 6, the grip; 7, the polishing disc; 8, the control switch; 9, the first air inlet; 10, the power cord; 11, the circuit board assembly; 12, the holding center line; 13, the second heat dissipation air path; 14, the second air inlet; 15, the auxiliary handle; 16, the first heat dissipation air path; 17, the first air outlet; 18, the machine shell; 19, the motor; 20, the middle cover; 21, the heat dissipation fan; 22, the shaft center line; 23, the head shell main body; 24, the driven bevel gear; 25, the driving bevel gear; 26, the output shaft; 27, the bottom cover; 28, the second air outlet; 29, the second joint; 30, the third heat dissipation air path; 31, the channel; 32, the third air inlet; 33, the communication hole; 34, the right half shell; 35, the left half shell; 36, the first joint; 37, the head shell. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is merely illustrative, exemplary, and should not be construed as limiting the scope of protection of the present application.

[0029] It should be noted that similar reference numerals refer to similar items in the following drawings, and once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings.

[0030] Figures 1-9 As shown, the polishing machine with good balance includes a shell 1, a motor 19 and a polishing disc 7, the motor 19 is mounted in the shell 1, the polishing disc 7 is coupled with the motor 19, the motor 19 outputs power to move the polishing disc 7, the polishing disc 7 rubs with the surface to be polished, thereby removing defects such as surface contamination, oxide layer and shallow marks, and obtaining a bright and smooth surface.

[0031] Figure 1 、 Figure 2 As shown, the shell 1 includes a handle 3 for holding by hand, a front shell 4 fixed to the front end of the handle 3, and a rear shell 2 fixed to the rear end of the handle 3, the motor 19 is fixedly installed in the front shell 4, the motor 19 outputs power as a power source, the polishing disc 7 is arranged below the front shell 4 and coupled with the motor 19, the rear shell 2 is provided with a circuit board assembly 11, the motor 19 is electrically connected with the circuit board assembly 11, and the circuit board assembly 11 can control the working state of the motor 19.

[0032] The patent sets the motor 19 and the polishing disc 7 at the front of the handle 3, and sets the circuit board assembly 11 at the hand of the handle 3, balances the weight of the motor 19 and the polishing disc 7 at the front by the weight of the circuit board assembly 11 at the back, greatly improves the balance of the mass distribution of the polishing machine, makes the handheld polishing machine perform better balance when in use, effectively reduces the arm fatigue of the operator, improves the work efficiency and quality, and separates the circuit board assembly 11, the motor 19 and the polishing disc 7 front and back, can reduce the high temperature accumulated in the working process, and reduce the risk of damage of the internal motor 19 or the circuit board assembly 11 and other components due to high temperature.

[0033] The front shell 4 includes a machine shell 18 fixed to the front end of the handle 3 and a head shell 37 fixed to the front side of the machine shell 18, the motor 19 is installed in the machine shell 18, the output shaft 26 is provided on the head shell 37, and the polishing disc 7 is connected to the output shaft 26, and the head shell 37 is provided with a transmission mechanism connecting the motor shaft of the motor 19 and the output shaft 26.

[0034] Figure 2 、 Figure 4 As shown, preferably, the handle 3 is integrally formed with the rear shell 2, and the whole formed by the handle 3 and the rear shell 2 is connected by the left half shell 35 and the right half shell 34, the front ends of the left half shell 35 and the right half shell 34 are clamped between the rear side of the machine shell 18, and the left half shell 35, the right half shell 34 and the machine shell 18 are fixed and connected together by screws, the head shell 37 includes a head shell body 23 and a bottom cover 27 fixed and connected to the lower side of the head shell body 23 by screws, the output shaft 26 extends from the bottom cover 27 and is connected to the polishing disc 7 below, the head shell 37 is provided with an intermediate cover 20 clamped between the rear side of the head shell body 23 and the front side of the machine shell 18, and the head shell body 23, the intermediate cover 20 and the machine shell 18 are fixed and connected together by screws, and the structure of the shell 1 is the existing structure in the art.

[0035] Preferably, the transmission mechanism includes a driving bevel gear 25 and a driven bevel gear 24, the driving bevel gear 25 is fixed to the motor shaft extending into the head shell 37, the driven bevel gear 24 is fixed to the output shaft 26, the driving bevel gear 25 is engaged with the driven bevel gear 24, and the two are perpendicular to change direction, when the motor 19 is started, the motor shaft drives the driving bevel gear 25 to rotate, the driving bevel gear 25 drives the driven bevel gear 24 to rotate, the driven bevel gear 24 drives the output shaft 26 to rotate, so that the polishing disc 7 connected to the output shaft 26 rotates to rub the surface to be polished, and the transmission structure of the motor 19 and the polishing disc 7 is the conventional structure in the art.

[0036] Figure 2 As shown, the holding center line 12 of the handle 3 is perpendicular or substantially perpendicular to the axis center line 22 of the output shaft 26.

[0037] Figure 2 As shown in the drawings, the front end of the handle 3 or the shell 18 is provided with a first air inlet 9 located at the rear side of the motor 19, and the motor shaft of the motor 19 is connected with a cooling fan 21 located at the front side of the motor 19. The side wall of the shell 18 is provided with a first air outlet 17 opposite to the cooling fan 21, so as to form a first cooling air path 16 which enters from the first air inlet 9, passes through the shell 18, and is discharged from the first air outlet 17. The airflow passing through the first cooling air path 16 carries away the heat generated by the motor 19 during operation, thereby achieving the effect of cooling the motor 19.

[0038] Preferably, the front end of the handle 3 is formed with a first joint 36 for connecting with the rear side of the shell 18, and the first air inlet 9 is arranged on the first joint 36.

[0039] The middle cover 20 is provided with a second air outlet 28 opposite to the cooling fan 21, the head shell 37 is provided with a third air inlet 32, and the middle cover 20 is provided with a communication hole 33 communicating the second air outlet 28 and the third air inlet 32, so as to form a third cooling air path 30 between the third air inlet 32 and the second air outlet 28.

[0040] Preferably, the rear side of the head shell body 23 is formed with a second joint 29 for connecting with the middle cover 20 and the shell 18, and the second joint 29 is pressed on the middle cover 20. The third air inlet 32 is arranged on the second joint 29, and the third air inlet 32 faces the side wall of the head shell body 23. The second joint 29 and the head shell body 23 form a channel 31 for the external air to enter the third air inlet 32. When the cooling fan 21 rotates, the external air enters the space surrounded by the middle cover 20 and the second joint 29 from the third air inlet 32 through the channel 31, and then enters the space surrounded by the middle cover 20 at the front side of the shell 18 through the communication hole 33, and finally is discharged from the second air outlet 28. The air passing through the channel 31 carries away part of the heat on the head shell body 23, thereby achieving the effect of cooling the head shell 37.

[0041] Figure 6 As shown in the drawings, preferably, the cooling fan 21 has blades on both sides. The blades on one side are opposite to the first air outlet 17, and the blades on the other side are opposite to the second air outlet 28. The cooling fan 21 is a centrifugal fan.

[0042] In addition, the rear shell 2 is provided with a second air inlet 14, so as to form a second cooling air path 13 which enters the inside of the rear shell 2 from the second air inlet 14, enters the inside of the shell 18 through the inside of the handle 3, and is discharged from the first air outlet 17. The airflow passing through the second cooling air path 13 carries away the heat generated by the circuit board assembly 11 and the motor 19 during operation, thereby achieving the effect of cooling. Preferably, a dust screen for air passing through can be arranged on the second air inlet 14.

[0043] In addition, the patent also has other structures for dissipating heat from the circuit board assembly 11, such as a first heat dissipation hole formed in the rear housing 2 and communicating with the interior of the rear housing 2, so that the heat generated by the circuit board assembly 11 can be directly dissipated from the first heat dissipation hole.

[0044] Figure 1 、 Figure 5 As shown in the figure, a cover 5 can be provided outside the head shell 37, and the cover 5 is fixed to the head shell 37 by screws. The cover 5 is provided with a forwardly protruding gripping portion 6 for the hand to grip. When using the polishing machine, one hand can hold the handle 3, and the other hand can grip the gripping portion 6. The polishing machine can be more stably controlled by holding it forwardly and rearwardly.

[0045] Figure 8 、 Figure 9 As shown in the figure, the cover 5 is not necessary. An auxiliary handle 15 can be fixedly installed on the head shell 37. The auxiliary handle 15 is a non-closed loop handle, and the two ends of the loop handle are fixedly connected to the left and right sides of the head shell 37. Alternatively, the auxiliary handle 15 can also be a cylindrical structure fixed to one side of the head shell 37.

[0046] In addition, the rear housing 2 protrudes from the side wall of the handle 3. When the hand is gripping the handle 3, the rear housing 2 can serve as a resting portion for the rear side of the hand.

[0047] The rear housing 2 is fixed with a power cord 10, which is electrically connected to the circuit board assembly 11. The power supply is used to connect the external power socket to the polishing machine for power supply. The handle 3 is provided with a control switch 8 electrically connected to the circuit board assembly 11.

[0048] The above describes the polishing machine with good balance provided by the present application. The principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the present application and the core idea. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in many ways. These improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A well-balanced polisher comprising a housing, a motor and a polishing disc, characterized in that, The shell comprises a handle, a front shell fixed to the front end of the handle, and a rear shell fixed to the rear end of the handle, the motor is arranged in the front shell as a power source, the polishing disc is arranged below the front shell and is coupled with the motor, and the rear shell is provided with a circuit board assembly.

2. The well-balanced polishing machine according to claim 1, characterized by, The rear shell protrudes from the side wall of the handle.

3. The well-balanced polishing machine according to claim 1, characterized by, The front shell comprises a machine shell fixed to the front end of the handle and a head shell fixed to the front side of the machine shell, the motor is arranged in the machine shell, the head shell is provided with an output shaft, the polishing disc is connected to the output shaft, and the head shell is provided with a motor shaft coupled with the motor and a transmission mechanism coupled with the output shaft.

4. The well-balanced polishing machine according to claim 3, characterized by, The first air inlet is arranged on the front end of the handle or the machine shell and is located at the rear side of the motor, the motor shaft of the motor is connected with a cooling fan located at the front side of the motor, and the side wall of the machine shell is provided with a first air outlet opposite to the cooling fan to form a first cooling air path entering from the first air inlet, passing through the machine shell, and being discharged from the first air outlet.

5. The well-balanced polishing machine according to claim 1, wherein The rear shell is provided with a first cooling hole for discharging heat generated by the circuit board assembly.

6. The well-balanced polishing machine according to claim 3, wherein The rear shell is provided with a second air inlet, the motor shaft of the motor is connected with a cooling fan located at the front side of the motor, and the side wall of the machine shell is provided with a first air outlet opposite to the cooling fan to form a second cooling air path entering the interior of the rear shell from the second air inlet, entering the interior of the machine shell through the handle, and being discharged from the first air outlet.

7. The well-balanced polishing machine according to claim 3, wherein The motor shaft of the motor is connected with a cooling fan located at the front side of the motor, an intermediate cover is arranged between the machine shell and the head shell, the intermediate cover is provided with a second air outlet opposite to the cooling fan, the head shell is provided with a third air inlet, and the intermediate cover is provided with a communication hole communicating the second air outlet and the third air inlet to form a third cooling air path between the third air inlet and the second air outlet.

8. The well-balanced polisher according to claim 1, wherein The rear shell is fixed with a power cord electrically connected with the circuit board assembly, and the handle is provided with a control switch.

9. The well-balanced polisher according to claim 3, wherein The front part of the shell is provided with a cover shell covering the outside of the head shell, and the cover shell is formed with a forward protruding gripping part.

10. The well-balanced polishing machine according to claim 3, characterized by, The gripping center line of the handle is perpendicular or substantially perpendicular to the axis of the output shaft.

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