Wall surface grinding machine

Abstract

The invention relates to a wall surface grinding machine which comprises a shell, a motor, a transmission mechanism, a fan and a grinding disc, the shell comprises a first shell body for installing the motor and a second shell body for installing the transmission mechanism, and the shell is provided with an air inlet and an air outlet which are communicated with each other; the wall grinding machine further comprises an air guide mechanism connected to the shell, a first air path space is formed by the first shell and the air guide mechanism, a second air path space is formed by the second shell and the air guide mechanism, and the air inlets comprise the first air inlet formed in the first air path space and the second air inlet formed in the second air path space. The first air inlet and the second air inlet are located in the two ends of the air guide mechanism. The air guide mechanism is arranged on the wall grinding machine, the first shell and the air guide mechanism form the first air path space, the second shell and the air guide mechanism form the second air path space, and the first air inlet and the second air inlet are located in the two ends of the air guide mechanism, so that double-air-path heat dissipation is achieved, heat generated by the whole machine is better discharged, and efficient cooling is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and particularly to a wall sander. Background Art

[0002] As a commonly used grinding and polishing tool, a wall sander uses a driving motor as power to drive the grinding head on the grinding disc to rotate at a high speed, so as to achieve the leveling and polishing work of the interior decoration wall. Generally, after the wall sander runs and grinds for a period of time, the machine will inevitably be damaged, such as motor damage, gearbox failure, bearing failure, etc. Among them, motor damage and gearbox failure are two relatively common phenomena, and excessive temperature rise during operation accounts for a large factor.

[0003] In the wall sander of the prior art, reference can be made to the Chinese utility model patent CN210132332U announced on March 10, 2020, which discloses that: the reduction gearbox assembly is arranged on the protective disc, the motor and the machine shell are arranged on the reduction gearbox assembly, the controller is located below the motor and arranged on the protective disc, and heat sinks are arranged on the upper surface of the controller. The heat sinks are located below the air outlet. When the machine is working, the external air enters through the air inlet of the rear cover, and then the air is sent downward by the fan blade. The air flow flows through the stator cavity and the surface of the heat sinks, taking away the heat generated by the motor and the controller during operation, so as to achieve the purpose of cooling the motor and the controller at the same time. However, the cooling air of the above structure is from top to bottom, and there is only one air inlet located at the rear cover, so the heat dissipation is limited and the heat generated by the whole machine cannot be quickly cooled efficiently.

[0004] In view of this, it is necessary to provide an improved wall sander to overcome the defects of the prior art. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a wall sander with double air path heat dissipation and good cooling effect.

[0006] The present invention can adopt the following technical solutions to solve the problems of the prior art: A wall grinding machine includes a housing, a motor housed in the housing, a transmission mechanism and a fan driven by the motor, and a grinding disc connected to the transmission mechanism. The housing includes a first housing for installing the motor and a second housing for installing the transmission mechanism. The housing is provided with an air inlet and an air outlet that communicate with each other. The fan rotates to suck cooling air from the air inlet, flow through the interior of the housing, and then discharge from the air outlet. The wall grinding machine further includes a wind guiding mechanism connected to the housing. A first wind path space is formed between the first housing and the wind guiding mechanism, and a second wind path space is formed between the second housing and the wind guiding mechanism. The air inlet includes a first air inlet formed in the first wind path space and a second air inlet formed in the second wind path space. The first air inlet and the second air inlet are located at both ends of the wind guiding mechanism.

[0007] A further improvement scheme is: The air inlet area of the first air inlet is smaller than the air inlet area of the second air inlet, and the air inlet area of the first wind path space is smaller than the air inlet area of the second wind path space.

[0008] A further improvement scheme is: The wind guiding mechanism has a guiding member protruding from the periphery of the second housing and a third housing connected to the guiding member. The third housing is spaced apart from the first housing and the second housing. At least part of the inner wall of the third housing surrounds the outer periphery of the first housing.

[0009] A further improvement scheme is: The length of the guiding member is less than half of the length of the third housing, and the guiding member has a draft angle from top to bottom, and the draft angle is 0.5°.

[0010] A further improvement scheme is: The second housing includes a first guiding portion adjacent to the first housing. The first guiding portion is provided at the end of the second housing facing the third housing. The cooling air entering from the second air inlet flows through the guiding member and then flows to the motor via the first guiding portion.

[0011] A further improvement scheme is: The first housing has a second guiding portion adjacent to the third housing. The cooling air entering from the first air inlet flows into the motor through the second guiding portion.

[0012] A further improvement scheme is: The slopes of the first guiding portion and the second guiding portion are equal.

[0013] A further improvement scheme is: The second housing has a connecting member protruding from the periphery. The wind guiding mechanism is symmetric on both sides with respect to the axis formed at the center of the connecting member.

[0014] A further improvement solution is as follows: The second housing further has a floating post adjacent to the connecting member. The connecting member and the floating post divide the air guiding mechanism into a first air guiding area, a second air guiding area, and a third air guiding area. The relationship among the area S1 of the first air guiding area, the area S2 of the second air guiding area, and the area S3 of the third air guiding area is as follows: S1 < S3 < S2.

[0015] A further improvement solution is as follows: The first air path space is configured such that the cooling air flows directly from the first air inlet to the motor and then flows out from the air outlet, and the second air path space is configured such that the cooling air flows through the transmission mechanism from the second air inlet, then flows to the motor, and then flows out from the air outlet.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By providing an air guiding mechanism on the wall grinding machine, a first air path space is formed between the first housing and the air guiding mechanism, and a second air path space is formed between the second housing and the air guiding mechanism. The first air inlet formed in the first air path space and the second air inlet formed in the second air path space are located at both ends of the air guiding mechanism, realizing double air path heat dissipation, better discharging the heat generated by the whole machine, and efficiently cooling. Specifically, the air inlet area of the first air inlet is smaller than that of the second air inlet, and the air inlet area of the first air path space is smaller than that of the second air path space. The main heat dissipation of the whole machine is at the second air inlet, realizing efficient heat dissipation for the transmission mechanism and the motor, while the second air inlet is an auxiliary heat dissipation air path, increasing the air intake volume and further dissipating heat for the motor; further, the length of the guiding member of the air guiding mechanism is less than half of the length of the third housing, and the guiding member has a draft angle from top to bottom, and its draft angle is 0.5°, which is convenient for part production demoulding and can also minimize the influence on the air inlet area of the second air inlet while increasing the heat dissipation area; finally, the connecting member and the floating post divide the air guiding mechanism into a first air guiding area, a second air guiding area, and a third air guiding area. The relationship among the area S1 of the first air guiding area, the area S2 of the second air guiding area, and the area S3 of the third air guiding area is as follows: S1 < S3 < S2. In a limited space area, users can set more guiding members 51 to increase the heat dissipation amount. [Description of the Drawings]

[0017] The following further describes the specific embodiments of the present invention in detail with reference to the drawings:

[0018] Figure 1 is a three-dimensional structural schematic diagram of the wall grinding machine of the present invention;

[0019] Figure 2 is Figure 1 a cross-sectional schematic diagram of the shown wall grinding machine;

[0020] Figure 3 is Figure 2Partial sectional view schematic diagram of the wall grinding machine shown;

[0021] Figure 4 is Figure 1 Partial exploded view schematic diagram of the wall grinding machine shown;

[0022] Figure 5 is Figure 4 Partial structural schematic diagram of the wall grinding machine shown;

[0023] Figure 6 is Figure 4 Partial exploded view schematic diagram of the fan and motor of the wall grinding machine shown;

[0024] Figure 7 is Figure 6 Sectional view schematic diagram of the fan of the wall grinding machine shown. [Specific implementation manner]

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", etc. are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0027] Please refer to Figures 1 to 4As shown in the figure, an embodiment of the present invention relates to a wall grinding machine 100, which includes a housing 1, a motor 2 housed in the housing 1, a transmission mechanism 3 and a fan 6 driven by the motor 2, a grinding disc 4 connected to the transmission mechanism 3, and a dust collection device 7 connected to the grinding disc 4. The housing 1 includes a first housing 11 for installing the motor 2, a second housing 12 for installing the transmission mechanism 3, and a fourth housing 13 connected to the first housing 11. The transmission mechanism 3 and the fan 6 are respectively located on both sides of the motor 2. The fan 6 is housed in the fourth housing 13. A universal mechanism 8 of the wall grinding machine 100 is connected to the second housing 12. A first fastener 110 of the wall grinding machine 100 fastens the first housing 11 and the fourth housing 13. The first fastener 110 preferably adopts a screw structure, but is not limited thereto. In addition, it should be noted that the fan 6 is configured as an axial flow fan. In addition, one end of a front fork device 9 of the wall grinding machine 100 is installed on the universal mechanism 8, and the other end is installed on the dust collection device 7. When the wall grinding machine 100 is under the action of a driving source and the motor 2 drives the transmission mechanism 3 to work, the grinding disc 4 abuts against the wall to be processed. By controlling the front fork device 9 to adjust the angle and force state of the universal mechanism 8, etc., the required grinding working condition is achieved. Among them, the dust and chips ground out are collected by the dust collection device 7.

[0028] In this embodiment, the housing 1 is provided with an air inlet 10 and an air outlet 20 that communicate with each other. The air outlet 20 is provided above the housing 1, that is, the air outlet 20 is located on the fourth housing 13, and the fan 6 is adjacent to the air outlet. By rotating the fan 6, the cooling air is sucked in from the air inlet 10, flows through the inside of the housing 1, and then is discharged from the air outlet 20, so as to realize the heat dissipation and cooling of the whole machine and improve the service life. It should be noted that since the fan 6 is an axial flow fan and is installed in the fourth housing 13, the cooling air is a flowing air path from bottom to top. The wall grinding machine further includes a wind guiding mechanism 5 connected to the housing 1. A first wind path space 30 is formed between the first housing 11 and the wind guiding mechanism 5, and a second wind path space 40 is formed between the second housing 12 and the wind guiding mechanism 5. The air inlet 10 includes a first air inlet 101 formed in the first wind path space 30 and a second air inlet 102 formed in the second wind path space 40. The first air inlet 101 and the second air inlet 102 are located at both ends of the wind guiding mechanism. By providing two air inlets, the air intake volume of cooling is increased, and the whole machine is better cooled. That is to say, the first air inlet 101 plays an additional heat dissipation role for the heat dissipation of the whole machine, which is equivalent to additionally increasing the air intake area on the air intake area of the second air inlet 102 and increasing the air volume of cooling.

[0029] Specifically, the motor 2 has a rotating shaft 21 mounted on the housing 1, a stator 22 and a rotor 23 mounted on the rotating shaft 21, and the stator 22 and the rotor 23 are connected to each other. The second air path space 40 plays a major role in heat dissipation, and its path is that the cooling air enters the housing 1 from the second air inlet 102 through the air guide mechanism 5, passes through the gap between the rotor 23 and the stator 22 and the gap between the stator 22 and the housing 1, and then passes through the fan 6 to throw the heat out of the air outlet 20 of the machine; the first air path space 30 is configured so that the cooling air flows directly from the first air inlet 101 to the motor 2 and then flows out from the air outlet 20, which plays a good additional role in the heat dissipation of the whole machine.

[0030] Furthermore, the air inlet area of ​​the first air inlet 101 is smaller than that of the second air inlet 102, and the air inlet area of ​​the first air path space 30 is smaller than that of the second air path space 40. The first air inlet 101 is mainly provided to assist the second air inlet 102 in heat dissipation and increase the air intake, which plays an auxiliary role; the main heat dissipation of the whole machine is at the second air inlet 102, which is to efficiently dissipate heat for the transmission mechanism 3 and the motor 2; and the pressure of the second air inlet 102 is higher than that of the second air inlet 101, so as to maintain a large wind pressure and achieve effective cooling.

[0031] See also Figure 2 and Figure 3 As shown, the air guide mechanism 5 has a guide member 51 protruding from the periphery of the second shell 12 and a third shell 52 connected to the guide member 51. The third shell 52 is separated from the first shell 11 and the second shell 12, and the inner wall of the third shell 52 at least partially surrounds the outer periphery of the first shell 11. It should be noted that in this embodiment, the guide member 51 adopts a rib position, and by conducting the heat on the transmission mechanism 3 to the guide member 51, the cooling wind takes away the heat of the guide member 51, thereby achieving effective heat dissipation on the transmission mechanism 3 and improving its service life.

[0032] In this embodiment, the length of the guide 51 is less than half the length of the third shell 52, which avoids the collision of cooling air after entering from the first air inlet 101 and the second air inlet 102 respectively, and reduces the amount of air for converging cooling of the motor 2. In addition, the more ribs are set, the larger the heat dissipation area is, and the more heat is transferred out, but the cross-street area of ​​the guide 51 will affect the overall air inlet area of ​​the second air inlet 102, so the guide 51 has a top-down draft angle (not shown), which is 0.5°. On the one hand, it is convenient for demolding during part production, and on the other hand, it increases the heat dissipation area while minimizing the impact on the air inlet area of ​​the second air inlet 102.

[0033] See also Figure 3As shown in the figure, the second housing 12 includes a first guiding portion 121 adjacent to the first housing 11. The first guiding portion 121 is provided at the end of the second housing 12 facing the third housing 52. The cooling air entering from the second air inlet 102 passes through the guiding member 51 and flows to the motor 2 via the first guiding portion 121, which can better guide the cooling air at the second air inlet 102 from the transmission mechanism 3 to the motor 2, achieving the main heat dissipation effect. In addition, the first housing 11 has a second guiding portion 111 adjacent to the third housing 52. The cooling air entering from the first air inlet 101 flows into the motor 2 through the second guiding portion 111, which can better directly transfer the cooling air at the first air inlet 101 to the motor 2, achieving auxiliary effective heat dissipation.

[0034] In this embodiment, the slopes of the first guiding portion 121 and the second guiding portion 111 are equal, avoiding the collision of the cooling air in the first air path space 30 and the cooling air in the second air path space 40 due to the action of the heat dissipation pressure, reducing the loss of air volume, and improving the heat dissipation effect.

[0035] Please refer to Figure 1 and Figure 5 As shown in the figure, the second housing 12 has a connecting member 122 protruding from the periphery. The air guiding mechanism 5 is symmetric on both sides with respect to the axis formed at the center of the connecting member 122, achieving uniform heat dissipation for the transmission mechanism 3 and improving the service life. Moreover, the connecting member 122 is provided for installing the universal structure 8, so that the user can adjust the grinding angle to achieve smooth grinding.

[0036] In this embodiment, the second housing 12 also has a floating post 123 adjacent to the connecting member 122. The connecting member 122 and the floating post 123 divide the air guiding mechanism 5 into a first air guiding area 50, a second air guiding area 60, and a third air guiding area 70. The relationship between the area S1 of the first air guiding area, the area S2 of the second air guiding area, and the area S3 of the third air guiding area is as follows: S1 < S3 < S2. In a limited space area, the user can set more guiding members 51 to increase the heat dissipation amount.

[0037] In addition, the second housing 12 is also provided with a protruding portion 124 protruding from the end face of the floating post 123. The first housing 11 has a lug member 112 protruding from the periphery. The protruding portion 124 and the lug member 112 are fastened by a second fastener 120, and the installation is firm. The second fastener 120 adopts a screw structure in this embodiment, but is not limited thereto.

[0038] Please refer to Figure 6 and Figure 7 As shown in the figure, the fan 6 has an installation portion 61 penetrating through the end face. The installation portion 61 is combined with the rotating shaft 21, which is convenient for better installing the fan 6 on the motor 2. By using the rotation of the motor 2, an upward flowing air path is generated to achieve the cooling and heat dissipation of the whole machine.

[0039] In this embodiment, the fitting form of the mounting portion 61 and the rotating shaft 21 is an interference fit. The rotating shaft 21 has a convex portion 211 protruding from the periphery, and the mounting portion 61 has a concave portion 611 recessed from the wall surface. The convex portion 211 is engaged with the concave portion 611, preventing the interference press-fitting of the mounting portion 61 and the rotating shaft 21 when the motor 2 rotates at a high speed from ensuring that the fan 6 will not become loose or fall off after the machine moves for a long time, so as to improve the working experience of the user.

[0040] In addition, please refer to Figure 2 As shown, the height L of the wall grinding machine 100 is less than 120 mm. Further, the ratio of the distance L1 from the lower end surface of the stator 22 to the end surface of the grinding disc 4 to the height L of the wall grinding machine 100 is 0.5 - 0.8. It should be noted that the fan 6 is arranged at the rear end, that is, arranged in the fourth housing 13, and adopts an axial flow blade form, with a clever layout, reducing the air guiding structure necessary for the centrifugal fan commonly used in the prior art, shortening the axial height of the whole machine, reducing the center of gravity of the whole machine, making the grinding more stable, and providing a better operation experience for the user.

[0041] The present invention is not limited to the above specific embodiments. It is easy for those of ordinary skill in the art to understand that there are many alternative solutions for the wall grinding machine of the present invention without departing from the principles and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A wall grinding machine, comprising a housing, a motor housed in the housing, a transmission mechanism and a fan driven by the motor, and a grinding disc connected to the transmission mechanism. The housing includes a first housing for installing the motor and a second housing for installing the transmission mechanism. The housing is provided with an air inlet and an air outlet that communicate with each other. The fan rotates to suck cooling air from the air inlet, flow through the interior of the housing, and then discharge it from the air outlet. It is characterized in that: The wall grinding machine further includes a wind guiding mechanism connected to the housing. A first wind path space is formed between the first housing and the wind guiding mechanism, and a second wind path space is formed between the second housing and the wind guiding mechanism. The air inlet includes a first air inlet formed in the first wind path space and a second air inlet formed in the second wind path space. The first air inlet and the second air inlet are located at two ends of the wind guiding mechanism.

2. The wall grinding machine according to claim 1, characterized in that: The air inlet area of the first air inlet is smaller than that of the second air inlet, and the air inlet area of the first wind path space is smaller than that of the second wind path space.

3. The wall grinding machine according to claim 2, wherein: The wind guiding mechanism has a guiding member protruding from the periphery of the second housing and a third housing connected to the guiding member. The third housing is spaced apart from the first housing and the second housing, and at least part of the inner wall of the third housing surrounds the outer periphery of the first housing.

4. The wall grinding machine according to claim 3, wherein: The length of the guiding member is less than half of the length of the third housing, and the guiding member has a draft angle from top to bottom, and the draft angle is 0.5°.

5. The wall grinding machine according to claim 4, wherein: The second housing includes a first guiding portion adjacent to the first housing. The first guiding portion is provided at the end of the second housing facing the third housing. The cooling air entering from the second air inlet flows through the guiding member and then through the first guiding portion and then flows to the motor.

6. The wall grinding machine according to claim 5, characterized in that: The first housing has a second guiding portion adjacent to the third housing. The cooling air entering from the first air inlet flows into the motor through the second guiding portion.

7. The wall grinding machine according to claim 6, wherein: The slopes of the first guiding portion and the second guiding portion are equal.

8. The wall grinding machine according to claim 1, wherein: The second housing has a connecting member protruding from the periphery. The wind guiding mechanism is symmetric on both sides with respect to the axis formed at the center of the connecting member.

9. The wall grinding machine according to claim 8, characterized in that: The second housing further has a floating column adjacent to the connecting member. The connecting member and the floating column divide the wind guiding mechanism into a first wind guiding area, a second wind guiding area and a third wind guiding area. The relationship between the area S1 of the first wind guiding area, the area S2 of the second wind guiding area and the area S3 of the third wind guiding area is as follows: S1 < S3 < S2.

10. The wall grinding machine according to claim 1, characterized in that: The first wind path space is configured such that the cooling air directly flows from the first air inlet to the motor and then flows out from the air outlet. The second wind path space is configured such that the cooling air flows from the second air inlet through the transmission mechanism and then flows to the motor and then flows out from the air outlet.

Images