A polishing machine

Abstract

The present invention provides a polishing machine, belonging to the field of mechanical technology. It solves the problems of poor heat dissipation and unstable rotation of existing polishing machines. The polishing machine with an improved structure comprises a housing and a motor arranged in the housing, a balancing block is fixedly connected to the motor shaft, and is characterized in that a concave stirring groove is provided on the surface of the balancing block facing the motor, and an air outlet is provided on the housing. The polishing machine with an improved structure has fast heat dissipation and stable rotation.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a mechanical processing part, in particular to a polishing machine. Background Art

[0002] Polishing machines are also called grinders and are often used for mechanical grinding, polishing and waxing. The working principle is: the motor drives the sponge or wool polishing disc installed on the polishing machine to rotate at high speed. Due to the combined effect of the polishing disc and the polishing agent and the friction with the surface to be polished, the paint surface pollution, oxide layer and shallow marks can be removed.

[0003] A handheld multi-purpose polishing machine is disclosed in the patent No. 201820889805.X, in which a motor is arranged in the polishing machine body, and the motor is fixedly connected to the outer throwing disc and the inner throwing disc through a rotating shaft and drives the outer throwing disc and the inner throwing disc to rotate to achieve polishing. Specifically, the motor is arranged in the housing, and the inner throwing disc and the outer throwing disc are arranged outside the housing. The polishing machine can adjust different gears of the polishing machine by setting two through holes to achieve specific polishing by using the inner throwing disc or the outer throwing disc. The above-mentioned polishing machine realizes polishing by directly rotating the motor shaft and driving the polishing disc to rotate coaxially. There are also some polishing machines on the market that realize polishing by connecting a balancing block to the output end of the motor shaft, which also has a good polishing effect.

[0004] Although the polishing effect of the above-mentioned polishing machine is not satisfactory, it will inevitably cause the problem of motor heating during the high-speed operation of the motor. If the polishing machine works intermittently for a short period of time, there is basically no big problem. If it needs to work uninterruptedly for a long time, it is easy to cause the motor temperature to be too high, and the motor is installed inside the shell. The heat dissipation inside the shell is poor, which may easily cause the motor to burn out or be damaged in the long run. The prior art has also made improvements for this. For example, the conventional practice is to set a small fan inside the motor. For example, the patent with patent number 201610543590.1 discloses a wall-climbing grinding and polishing machine. A fan is set inside the polishing machine, and the fan accelerates the gas flow to help dissipate heat. However, the fan blades are easily affected by the airflow and shake during the fanning process, which can easily cause unstable rotation. Conventionally, structures such as thermal Pol Tie are also set on the side wall of the shell to help conduct heat, but it is easy to cause the engine to increase in size and greatly increase the cost. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to propose a polishing machine, which solves the technical problem of how to speed up the heat dissipation of the polishing machine and ensure smooth rotation.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A polishing machine comprises a shell and a motor arranged in the shell, a balancing block is fixedly connected to the motor shaft, and the characteristic is that a concave stirring groove is formed on the surface of the balancing block facing the motor, and an air outlet is formed on the shell.

[0008] In this patent, a turbulence groove facing the motor is arranged on the balance block, and the turbulence groove has a concave cavity, so that the entire balance block is high around and low in the middle, that is, under the same balance condition, the thickness of the balance block except the concave cavity can be made thicker. In the process of the motor driving the balance block to rotate, the outer edge of the balance block can have more effective area to contact the air and drive the air to the side of the balance block to cause turbulence, thereby accelerating the air flow speed and accelerating the heat exchange. In the process of the motor driving the balance block to rotate, a certain degree of shaking will inevitably occur. This shaking causes the balance block to drive the concave cavity to vibrate slightly in the front and back directions, that is, along the direction of the motor shaft, during the rotation process. The vibration is more obvious the further outward. In this case, there is a turbulence groove facing the side of the motor. At this time, the concave cavity structure and the high point around the concave cavity form a flipper-like structure and can generate a pulling force on the air toward the side of the motor. Combined with the turbulent movement around the balance block, the gas can be further flowed toward the direction of the motor through the driving force along the direction of the motor shaft, accelerating the air flow around the motor and generating heat exchange. The present invention also provides an air outlet penetrating the shell on the cavity wall of the motor accommodating cavity, so that the air can be discharged in time after exchanging heat with the motor, so as to achieve the purpose of accelerating the heat dissipation of the motor.

[0009] In addition, due to the concave cavity structure, the thickness of the outer edge of the balance block excluding the concave cavity can be made thicker, that is, the peripheral side of the balance block can have stronger strength during the entire rotation process of the balance block, and it is not easy to cause further balance problems due to airflow fluctuations, so a certain degree of stability can also be guaranteed.

[0010] In the above-mentioned polishing machine, the balancing block includes a body and a balancing portion protruding from the outer wall of the body, and the stirring groove is provided on the balancing portion. The balancing portion is relatively located more on the outer peripheral side of the balancing block and the rotation amplitude of the balancing portion is larger during the rotation process. By arranging the stirring groove on the balancing portion, the patent can ensure that the inevitable shaking caused by the rotation of the motor is fully utilized, so that the shaking degree of the stirring groove along the circumference of the motor is larger, ensuring that the gas is driven to move toward the motor more quickly and the heat dissipation of the motor is accelerated.

[0011] In the above-mentioned polishing machine, the balancing part is in the shape of a plate or a block, and the balancing part includes a reinforcement section located in the middle and the thickness of the reinforcement section is greater than the thickness of the remaining positions of the balancing part. The plate-shaped or block-shaped balancing part has a relatively regular shape, and the contact surface with the air during movement is relatively stable, which can ensure the smoothness of movement. In addition, in this patent, the thickness of the reinforcement section is set to be greater than the thickness of the remaining positions, and a height difference is formed between the reinforcement section and the remaining positions, that is, a step surface is formed at the connection between the reinforcement section and the remaining positions, so that when the balancing block rotates along the motor shaft, the gas can impact the step surface and change the gas flow direction when it flows from the remaining positions of the balancing part and flows to the reinforcement section, thereby accelerating the gas flow speed and helping to dissipate heat.

[0012] In the above-mentioned polishing machine, the balancing part is in the shape of a fan-shaped plate and the side of the balancing part away from the main body is an arc-shaped side. The balancing part includes two weakened sections that are both connected to the reinforcement section and the two weakened sections are symmetrically arranged on both sides of the reinforcement section. Setting the balancing part as a weakened section with a symmetrical structure and setting the thicker reinforcement section in the middle can ensure stability during rotation and avoid instability caused by excessive shaking. The weakened sections are arranged on both sides of the reinforcement section to ensure that the gas can flow through one of the weakened sections and flow to the reinforcement section regardless of whether the motor is rotating forward or reverse, and can impact the step surface between the reinforcement section and the weakened section and change the gas flow direction, increase the impact area, speed up the gas flow speed and help dissipate heat.

[0013] In the above-mentioned polishing machine, the above-mentioned stirring flow groove is provided on each of the weakened sections, and the stirring flow groove is arranged close to the reinforcement section and the notch area of ​​the stirring flow groove is greater than 2 / 3 of the upper surface area of ​​the weakened section. By providing stirring flow grooves on both weakened sections, the stirring flow effect can be improved and the forces at both ends of the fan-shaped balancing part can be ensured to be basically uniform and stable. The stirring flow groove is arranged close to the reinforcement section, which is equivalent to making the step surface where the reinforcement section and the weakened section are connected as one side of the groove wall of the entire groove, thereby making the area of ​​the step surface larger and making the stirring effect more obvious. It is preferred to set the notch area of ​​the stirring flow groove to be greater than 2 / 3 of the upper surface area of ​​the weakened section, so that the stirring flow effect of the weakened section is more significant.

[0014] In the above-mentioned polishing machine, the air outlet is in the shape of an elongated strip and is arranged at the connection between the motor shaft and the balance block. The number of the air outlets is at least two and they are arranged along the circumference of the motor. The air outlet is arranged on the cavity wall at the connection between the motor shaft and the balance block, so that the distance between the air outlet and the turbulence groove is not too long, which can ensure that obvious convection is generated at the two places to accelerate the flow rate of gas and help dissipate heat. Preferably, there are multiple air outlets and they are evenly arranged along the circumference of the motor. The elongated air outlet can make the air outlet narrower, which makes it easy for the gas to produce a flow rate change here to accelerate the flow rate of gas, and the flow cross-sectional area of ​​the gas flowing out of the elongated air outlet changes, which can also achieve resistive silencer to prevent a lot of noise.

[0015] In the above-mentioned polishing machine, the shell is further provided with an auxiliary air port at a position relative to the middle of the motor, and the auxiliary air port is in the shape of a long strip and is arranged obliquely with the air outlet. The setting of the auxiliary air port can help further speed up the gas flow speed and help dissipate heat. In addition, in this patent, by also setting the auxiliary air port in the shape of a long strip and being arranged obliquely with the air outlet, the flow direction of the gas flowing out of the auxiliary air port can be inconsistent with the flow direction of the gas flowing out of the air outlet, thereby causing the diversion direction of the gas inside the shell to be inconsistent, helping to drive the internal gas to achieve turbulence and speed up the gas flow speed, and also improving the gas radial flow along the motor and further heat exchange with the inner side of the motor to help dissipate heat.

[0016] In the above-mentioned polishing machine, the motor includes a motor housing and a rotor disposed in the motor housing, and four permanent magnets are further disposed between the motor housing and the rotor, the permanent magnets are fixedly connected to the motor housing and are evenly arranged along the circumference of the rotor, and there is a gap between the rotor and the permanent magnets. In this patent, by arranging four permanent magnets, compared with the traditional two permanent magnets, the entire motor can be made more miniaturized while ensuring the same magnetic properties, ensuring a compact motor structure, and thus enabling the entire polishing machine to be miniaturized.

[0017] In the above-mentioned polishing machine, the motor is further provided with an end cap at one end away from the balancing block, and the end cap is provided with two columnar lead seats, the length direction of the lead seats is perpendicular to the motor shaft and the two lead seats are arranged vertically. Since four permanent magnets are arranged in this patent, the two lead seats are arranged perpendicular to each other, so that a better magnetic effect can be ensured, magnetic interference can be prevented, and the working stability of the motor can be ensured.

[0018] In the above-mentioned polishing machine, the balancing block is also provided with an output shaft at one end away from the motor shaft, and the polishing machine includes a receiving plate, which is fixedly connected to the output shaft, and the receiving plate is provided with a ridge extending radially along the receiving plate on the side facing the motor, and the number of the ridges is at least two and arranged circumferentially along the receiving plate, and the thickness of the ridge protruding from the surface of the receiving plate gradually decreases from the inside to the outside of the receiving plate. This patent provides a ridge on the side of the receiving plate facing the motor, and the ridge can enhance the stability of the receiving plate and prevent the receiving plate from shaking too much during rotation and causing instability. In the present invention, the ridge is also arranged to be thin outside and thick inside, so that the ridge can rotate smoothly with the center of gravity inward as much as possible. In addition, the distance between the ridge and the balancing block gradually increases from the inside to the outside, and the larger the shaking amplitude of the outer periphery of the balancing block during rotation, the greater the balancing block interference with the receiving plate during use, and ensures smooth rotation.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. By providing a turbulence groove facing the motor on the balancing block, the entire balancing block is high around and low in the middle. Under the same balancing conditions, the thickness of the balancing block except the concave cavity can be made thicker. In the process of the motor driving the balancing block to rotate, the outer edge of the balancing block can have more effective area to contact the air and drive the air to turbulent flow around the balancing block, thereby accelerating the air flow speed and accelerating the heat exchange.

[0021] 2. When the motor is used to drive the balance block to rotate, a certain degree of shaking is inevitable. The concave structure of the stirring groove and the high points around the concave cavity form a flipper-like structure and can generate a driving force for the air along the motor shaft, so that the turbulent movement around the balance block can make the gas flow further toward the motor through the driving force along the motor shaft, accelerate the air flow around the motor and generate heat exchange. After exchanging heat with the motor, the air can be discharged in time through the air outlet to accelerate the heat dissipation of the motor.

[0022] 3. Due to the concave cavity structure, the thickness of the outer edge of the balance block excluding the concave cavity can be made thicker, that is, the peripheral side of the balance block can have strong strength during the entire rotation process of the balance block, and it is not easy to cause further balance problems due to airflow fluctuations, so a certain degree of stability can also be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of this polishing machine.

[0024] Figure 2 It is a cross-sectional view of this polishing machine.

[0025] Figure 3 It is a partial three-dimensional cross-sectional view of this polishing machine.

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the balance block.

[0027] Figure 5 It is the front view of the balancing weight.

[0028] Figure 6 yes Figure 2 AA section view.

[0029] Figure 7 It is a three-dimensional structural schematic diagram of the end cover.

[0030] Figure 8 It is a three-dimensional structural schematic diagram of the receiving tray.

[0031] In the figure, 1. shell; 11. air outlet; 12. auxiliary air outlet; 2. motor; 21. motor shaft; 22. motor shell; 23. rotor; 24. permanent magnet; 25. end cover; 251. lead holder; 3. balance block; 31. body; 32. balancing part; 321. reinforcement section; 322. weakening section; 33. stirring groove; 4. output shaft; 5. receiving plate; 51. convex ridge; 6. battery pack; 7. sponge plate. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figure 1 , Figure 2 As shown, a polishing machine includes a housing 1 and a motor 2 arranged in the housing 1. The motor 2 adopts a four-pole permanent magnet DC motor and is powered by a battery pack 6. The battery pack 6 is connected to the power switch, the motor 2 is connected to the control board, the power switch is connected to the speed control circuit, and the speed control circuit is connected to the motor 2. When the battery pack 6 is fully charged and inserted into the whole machine, the power switch is turned on, and the motor 2 will work and rotate. At this time, turn the speed control knob, and the motor 2 will change the speed and adjust it arbitrarily under the action of the speed control circuit board. Specifically, a balancing block 3 is fixedly connected to the motor shaft 21 in this embodiment, and the balancing block 3 is connected to the output shaft 4 equipped with a bearing, and the output shaft 4 is connected to the receiving plate 5, the sponge plate 7, etc. and pressed with screws. The rotation of the motor shaft 21 drives the balancing block 3 to rotate, and then the balancing block 3 drives the receiving plate 5 and the sponge plate 7 through the output shaft 4 to make a deflection or rotational motion to achieve polishing.

[0034] In the present invention, an air outlet 11 and an auxiliary air outlet 12 penetrating the housing 1 are arranged on the wall of the motor 2 housing cavity, so that the air can be discharged in time after exchanging heat with the motor 2, so as to achieve the purpose of accelerating the heat dissipation of the motor 2. Figure 1 As shown, the air outlet 11 is in an elongated shape and is arranged on the cavity wall where the motor shaft 21 is connected to the balance block 3. The elongated air outlet 11 can make the air outlet narrower, which can easily cause the gas flow rate to change here and speed up the gas flow rate. The flow cross-sectional area of ​​the gas flowing out of the elongated air outlet 11 changes, and the resistance silencing can also be achieved to prevent a lot of noise. The number of air outlets 11 is at least two and is arranged along the circumference of the motor 2.

[0035] In addition, the housing 1 is also provided with an auxiliary air port 12 at a position relative to the middle of the motor 2. The auxiliary air port 12 is in the shape of a long strip and is arranged obliquely with the air outlet 11. The setting of the auxiliary air port 12 can help further speed up the gas flow rate and help dissipate heat. In this patent, by also setting the auxiliary air port 12 in the shape of a long strip and being arranged obliquely with the air outlet 11, the flow direction of the gas flowing out of the auxiliary air port 12 can be inconsistent with the flow direction of the gas flowing out of the air outlet 11, thereby causing the diversion direction of the gas inside the housing 1 to be inconsistent, helping to drive the internal gas to achieve turbulence and speed up the gas flow rate, and also improving the radial flow of the gas along the motor 2 and further heat exchange with the inner side of the motor 2 to help dissipate heat.

[0036] like Figures 3 to 5 As shown, the balance block 3 in the present patent includes a body 31 and a balance portion 32 protruding from the outer wall of the body 31. The balance block 3 is cylindrical, and the balance portion 32 is plate-shaped and integrally formed with the body 31. Specifically, the balance portion 32 is fan-shaped and the side of the balance portion 32 away from the body 31 is an arc-shaped side. The balance portion 32 includes a reinforcement section 321 located in the middle, and the thickness of the reinforcement section 321 is greater than the thickness of the rest of the balance portion 32. The plate-shaped balance portion 32 has a relatively regular shape, and the contact surface with the air is relatively stable during movement, which can ensure the stability of movement.

[0037] In addition, in this patent, the thickness of the enhanced section 321 is set to be greater than the thickness of the remaining positions, and a height difference is formed between the enhanced section 321 and the remaining positions, that is, a step surface is formed at the connection between the enhanced section 321 and the remaining positions, so that when the balancing block 3 rotates along the motor shaft 21, the gas can impact the step surface and change the gas flow direction when flowing from the remaining positions of the balancing part 32 and flowing to the enhanced section 321, thereby accelerating the gas flow speed and helping heat dissipation.

[0038] like Figure 4 , Figure 5 As shown, the balancing part 32 also includes two weakened sections 322 connected to the reinforcement section 321, and the two weakened sections 322 are symmetrically arranged on both sides of the reinforcement section 321. Setting the balancing part 32 as a weakened section 322 with a symmetrical structure and setting the thicker reinforcement section 321 in the middle can ensure stability during the rotation process and avoid instability caused by excessive shaking. The weakened sections 322 are arranged on both sides of the reinforcement section 321 to ensure that the gas of the motor 2 can flow through one of the weakened sections 322 and flow to the reinforcement section 321, and can impact the step surface between the reinforcement section 321 and the weakened section 322 and change the gas flow direction, increase the impact area, speed up the gas flow speed and help heat dissipation.

[0039] In the process of the motor 2 driving the balance block 3 to rotate, a certain degree of shaking will inevitably occur. This shaking causes the balance block 3 to drive the cavity to vibrate slightly in the front and rear directions along the direction of the motor shaft 21 to a certain extent during the rotation process, and the vibration is more obvious the further out. Further, this patent makes full use of this characteristic, and a turbulence groove 33 is provided on each weakened section 322, so that the entire weakened section 322 is high around and low in the middle. In the process of the motor 2 driving the balance block 3 to rotate, the outer edge of the balance block 3 can have more effective area to contact with the air and drive the air to the side of the balance block 3 to generate turbulence, speed up the air flow speed and accelerate the heat exchange. At this time, the cavity structure and the high point of the side of the cavity form a flipper-like structure and can generate a driving force for the air along the motor shaft 21. At this time, combined with the turbulent motion occurring on the side of the balance block 3, the gas can be further flowed toward the direction of the motor 2 through the driving force along the direction of the motor shaft 21, accelerating the air flow on the side of the motor 2 and generating heat exchange. The present patent arranges the stirring groove 33 on the balancing part 32. The balancing part 32 is relatively located on the outer peripheral side of the balancing block 3 and the rotation amplitude of the balancing part 32 is larger during the rotation process, which can ensure that the inevitable shaking caused by the rotation of the motor 2 is fully utilized, so that the shaking degree of the stirring groove 33 along the circumference of the motor 2 is larger, ensuring that the gas is driven to move toward the motor 2 more quickly and the heat dissipation of the motor 2 is accelerated.

[0040] Furthermore, the stirring groove 33 is arranged close to the reinforcing section 321 and the notch area of ​​the stirring groove 33 is larger than 2 / 3 of the upper surface area of ​​the weakened section 322. By providing the stirring groove 33 on both weakened sections 322, the stirring effect can be improved and the forces on both ends of the fan-shaped balancing part 32 can be basically uniform and stable. It is preferred that the notch area of ​​the stirring groove 33 is set to be larger than 2 / 3 of the upper surface area of ​​the weakened section 322, so that the stirring effect of the weakened section 322 is more significant.

[0041] like Figure 3 , Figure 8As shown, the balancing block 3 is also provided with an output shaft 4 at one end away from the motor shaft 21, and the polishing machine includes a receiving plate 5, which is fixedly connected to the output shaft 4. The receiving plate 5 is provided with a ridge 51 extending radially along the receiving plate 5 on the side facing the motor 2, and the number of the ridges 51 is at least two and arranged circumferentially along the receiving plate 5, and the thickness of the ridge 51 protruding from the surface of the receiving plate 5 gradually decreases from the inside to the outside of the receiving plate 5. By providing the ridge 51 on the side of the receiving plate 5 facing the motor 2, the ridge 51 can enhance the stability of the receiving plate 5 and prevent the receiving plate 5 from shaking too much during the rotation process, causing instability. And the ridge 51 is set to be thin outside and inside, so that the ridge 51 can rotate smoothly with the center of gravity inside as much as possible. In addition, the distance between the ridge 51 and the balancing block 3 gradually increases from the inside to the outside, and the larger the shaking amplitude of the outer periphery of the balancing block 3 during the rotation process, the setting can prevent the balancing block 3 from interfering with the receiving plate 5 during use, and ensure stable rotation.

[0042] like Figure 3 , Figure 6 As shown, the motor 2 includes a motor housing 22 and a rotor 23 disposed in the motor housing 22. Four permanent magnets 24 are also disposed between the motor housing 22 and the rotor 23. The permanent magnets 24 are fixedly connected to the motor housing 22 and are evenly arranged along the circumference of the rotor 23. There is a gap between the rotor 23 and the permanent magnets 24. In this patent, by arranging four permanent magnets, compared with the traditional two permanent magnets 24, the entire motor 2 can be made more miniaturized while ensuring the same magnetic properties, ensuring that the motor 2 has a compact structure, and thus enabling the entire polishing machine to be miniaturized.

[0043] like Figure 3 , Figure 7 As shown, the motor 2 is further provided with an end cap 25 at one end away from the balancing block 3, and two columnar lead seats 251 are provided on the end cap 25, and the length direction of the lead seats 251 is perpendicular to the motor shaft 21 and the two lead seats 251 are vertically arranged. Since four permanent magnets are arranged in this patent, the two lead seats 251 are arranged to be perpendicular to each other, so that a better magnetic effect can be ensured, magnetic interference can be prevented, and the working stability of the motor 2 can be ensured.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0045] Although this article uses more terms such as housing 1, air outlet 11, auxiliary air outlet 12, motor 2, motor shaft 21, motor housing 22, rotor 23, permanent magnet 24, end cover 25, lead holder 251, balance block 3, body 31, balance part 32, reinforcement section 321, weakening section 322, flow stirring groove 33, output shaft 4, receiving plate 5, convex ridge 51, battery pack 6, sponge plate 7, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A polishing machine, comprising a housing (1) and a motor (2) disposed in the housing (1), wherein a balancing block (3) is fixedly connected to a motor shaft (21), characterized in that: The shell (1) is provided with an air outlet (11), and the balancing block (3) comprises a body (31) which is roughly cylindrical and a balancing portion (32) protruding from the outer peripheral wall of the body (31); the balancing portion (32) is in the shape of a fan-shaped plate and the body (31) is provided with the balancing portion (32) only on one side of the outer peripheral wall; the balancing portion (32) is arranged perpendicular to the axial direction of the body (31) and the thickness of the balancing portion (32) is smaller than the axial dimension of the body (31); the surface of the balancing portion (32) facing the motor (2) is provided with an inwardly concave stirring groove (33); the concave cavity structure of the stirring groove (33) and the high part around the concave cavity form a flipper-like structure.

2. The polishing machine according to claim 1, characterized in that: The balancing portion (32) comprises a reinforcement section (321) located in the middle, and the thickness of the reinforcement section (321) is greater than the thickness of other positions of the balancing portion (32).

3. The polishing machine according to claim 2, characterized in that: The side of the balancing portion (32) away from the main body (31) is an arc-shaped side, and the balancing portion (32) comprises two weakened sections (322) both connected to the reinforcing section (321), and the two weakened sections (322) are symmetrically arranged on both sides of the reinforcing section (321).

4. The polishing machine according to claim 3, characterized in that: The above-mentioned stirring groove (33) is provided on each of the weakened sections (322); the stirring groove (33) is arranged close to the reinforcing section (321), and the notch area of ​​the stirring groove (33) is greater than 2 / 3 of the upper surface area of ​​the weakened section (322).

5. The polishing machine according to any one of claims 1 to 4, characterized in that: The air outlet (11) is in the shape of an elongated strip and is arranged at the point where the motor shaft (21) and the balancing block (3) are connected. The number of the air outlets (11) is at least two and they are arranged along the circumference of the motor (2).

6. The polishing machine according to claim 5, characterized in that: The housing (1) is also provided with an auxiliary air port (12) at a position relative to the middle of the motor (2); the auxiliary air port (12) is in the shape of an elongated strip and is arranged obliquely relative to the air outlet (11).

7. The polishing machine according to any one of claims 1 to 4, characterized in that: The motor (2) comprises a motor housing (22) and a rotor (23) arranged in the motor housing (22); four permanent magnets (24) are further arranged between the motor housing (22) and the rotor (23); the permanent magnets (24) are fixedly connected to the motor housing (22) and are evenly arranged along the circumference of the rotor (23); and there is a gap between the rotor (23) and the permanent magnets (24).

8. The polishing machine according to claim 7, characterized in that: The motor (2) is further provided with an end cover (25) at one end away from the balancing block (3), and the end cover (25) is provided with two columnar lead seats (251), the length direction of the lead seats (251) is perpendicular to the motor shaft (21), and the two lead seats (251) are arranged vertically.

9. The polishing machine according to any one of claims 1 to 4, characterized in that: The balancing block (3) is also provided with an output shaft (4) at one end away from the motor shaft (21); the polishing machine comprises a receiving plate (5), the receiving plate (5) being fixedly connected to the output shaft (4); the receiving plate (5) is provided with a convex ridge (51) extending radially along the receiving plate (5) on a side facing the motor (2); the number of the convex ridges (51) is at least two and they are arranged circumferentially along the receiving plate (5); the thickness of the convex ridges (51) protruding from the surface of the receiving plate (5) gradually decreases from the inner side to the outer side of the receiving plate (5).

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