Sanding machine

Abstract

The present invention relates to a sanding machine, comprising: a machine housing; a motor disposed within the machine housing, having opposite head and tail ends, and an output shaft extending from the head end; a first fan disposed on the output shaft; a transmission shaft, the axis of the transmission shaft being parallel to the axis of the output shaft and driven to rotate by the output shaft; a working base plate connected to the transmission shaft and close to the head end; a second fan disposed on the transmission shaft and close to the working base plate. Wherein, at a position close to the tail end of the motor, the machine housing is provided with an air inlet; at a position close to the second fan, the machine housing is provided with an air outlet, forming a heat dissipation air duct for air to enter from the air inlet, pass through the motor, the first fan, and the second fan, and exhaust from the air outlet. In the above sanding machine, a heat dissipation air duct is formed for air to enter from the air inlet, pass through the motor, the first fan, and the second fan, and exhaust from the air outlet. The entire heat dissipation air path is shorter and smoother. In addition, the transmission shaft and the motor are arranged side by side, which also reduces the height of the machine housing and makes the overall structure more compact.

Description

Technical Field

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

[0002] Sanders are mainly used to make materials that are uneven, have uneven thickness, or do not meet the process requirements become smoother, have uniform thickness, and meet the process standards through physical removal methods such as sandcloth, grinding wheels, sandpaper, and scouring pads.

[0003] Due to the high-speed operation of the motor in traditional sanders, the motor overheats seriously. It is necessary to set a fan in the sander to reduce the motor heating phenomenon and lower the motor temperature rise.

[0004] In the process of implementing the traditional technology, the applicant found that the traditional method of solving heat dissipation has a poor effect on reducing the motor heating phenomenon. Summary of the Invention

[0005] Based on this, in view of the problem that the traditional method of solving heat dissipation has a poor effect on reducing the motor heating phenomenon, it is necessary to provide a sander.

[0006] A sander, comprising: a housing; a motor disposed within the housing, having a head end and a tail end opposite to each other, and an output shaft extending from the head end; a first fan disposed on the output shaft; a transmission shaft, the axis of the transmission shaft being parallel to the axis of the output shaft and driven to rotate by the output shaft; a working base plate connected to the transmission shaft and close to the head end; a second fan disposed on the transmission shaft and close to the working base plate; wherein, at a position close to the tail end, the housing is provided with an air inlet; at a position close to the second fan, the housing is provided with an air outlet, and a heat dissipation air duct is formed within the housing for air to enter from the air inlet, pass through the motor, the first fan, and the second fan, and exhaust from the air outlet.

[0007] The above technical solution has at least the following technical effects: The sander forms a heat dissipation air duct for air to enter from the air inlet, pass through the motor, the first fan, and the second fan, and exhaust from the air outlet. The first fan plays a role in guiding the air flow, controlling the flow path of most of the air flow, and then transmitting it to the second fan, accelerating the air flow and exhausting it from the air outlet. The entire heat dissipation air duct has a shorter path and is smoother. In addition, the transmission shaft is arranged parallel to the output shaft of the motor, which also reduces the height of the housing, makes the overall structure more compact, and improves the space utilization rate.

[0008] In one embodiment, at a position close to the air inlet, an air inlet hole is provided on the housing of the motor.

[0009] In one embodiment, a first pulley is further provided on the output shaft, a second pulley is further provided on the transmission shaft, and the second pulley is in belt transmission with the first pulley.

[0010] In one embodiment, the first fan includes a first skeleton body, the first skeleton body is provided with a first fixing member, the first pulley is provided with a through hole that cooperates with the first fixing member, and the first fixing member cooperates with the through hole to limit the relative axial movement between the first skeleton body and the first pulley. The first skeleton body is cooperated with the output shaft through the first pulley.

[0011] In one embodiment, the first pulley has a first connection hole provided along the axial direction, and the first connection hole cooperates with the output shaft.

[0012] In one embodiment, the first skeleton body is further provided with a first fitting hole, and the first pulley is provided with a first fitting portion that cooperates with the first fitting hole to transmit torque.

[0013] In one embodiment, the second fan includes a second skeleton body, and the second pulley is provided on the second skeleton body.

[0014] In one embodiment, the surfaces of the first pulley and the second pulley that cooperate with the belt are both provided with a plurality of tooth-ridge structures.

[0015] In one embodiment, the second skeleton body is further provided with a first fan blade, the first fan blade is close to the second pulley, and the first fan blade is close to the air outlet.

[0016] In one embodiment, the sander further includes a second fixing member, and the second fan is cooperated with the transmission shaft through the second fixing member.

[0017] In one embodiment, the second fixing member is provided with a second fitting portion, and the second fan is provided with a second fitting hole that cooperates with the second fitting portion to transmit torque.

[0018] In one embodiment, the second fixing member has a second connection hole provided along the axial direction, and the second connection hole cooperates with the transmission shaft.

[0019] In one embodiment, the sander further includes a connecting member disposed inside the machine shell, and the transmission shaft connects the working base plate through the connecting member.

[0020] In one embodiment, the transmission shaft has a third connection hole provided along the axial direction, and the third connection hole cooperates with the connecting member.

[0021] In one embodiment, a balance weight is further included, and the connecting member is connected to the working base plate through the balance weight.

[0022] In one embodiment, the third fitting hole is connected to the balance weight through a spline sleeve, and the surface of the third fitting hole connected to the balance weight has a plurality of tooth ridges.

[0023] In one embodiment, both the first fan and the second fan are centrifugal fans. Description of the Drawings

[0024] Figure 1 It is a schematic partial structure diagram of a sander in an embodiment of the present invention;

[0025] Figure 2 It is a schematic structure diagram of a sander in an embodiment of the present invention;

[0026] Figure 3 It is an exploded view of a first fan and a first pulley in an embodiment of the present invention;

[0027] Figure 4 It is an exploded view of a second fan and a second fixing member in an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the second fixing member from another angle in an embodiment of the present invention.

[0029] Wherein: 100, sander; 110, housing; 112, air inlet

[0030] 114, air outlet; 120, dust collection device; 130, battery pack

[0031] 140, holding part; 150, transmission shaft; 152, locking block

[0032] 154, connecting rod; 156, balance weight; 160, working base plate

[0033] 170, motor; 172, motor core; 174, output shaft

[0034] 176, air inlet hole; 180, first fan; 182, first frame body

[0035] 184, fan blade; 186, first fixing member; 188, first fitting hole

[0036] 1801, first pulley; 1802, first fitting part; 1803, through hole

[0037] 1804, first connection hole; 1805, tooth ridge structure; 190, second fan

[0038] 192, second frame body 194, first fan blade 196, second fan blade

[0039] 198, second pulley 1981, second fitting hole 1982, second fixing member

[0040] 1983, second fitting portion 1984, second connection hole 158, third connection hole

[0041] 1985, third fitting hole 159, spline sleeve

[0042] A, head end B, tail end H, height Detailed implementation manners

[0043] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and other similar expressions used herein are only for the purpose of clearer illustration.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0046] Please refer to Figure 1 and Figure 2, a sander 100 provided by an embodiment of the present invention includes: a housing 110; a motor 170 disposed within the housing 110, having opposite head end A and tail end B, and an output shaft 174 extending from the head end A; a first fan 180 disposed on the output shaft 174 of the motor 170; a transmission shaft 150, the axis of the transmission shaft 150 being parallel to the axis of the output shaft 174 of the motor 170; a working base plate 160 connected to the transmission shaft 150 and close to the head end A of the motor 170; a second fan 190 disposed on the transmission shaft 150 and close to the working base plate 160. Wherein, at a position close to the tail end B of the motor 170, the housing 110 is provided with an air inlet 112; at a position close to the second fan 190, the housing 110 is provided with an air outlet 114, and a heat dissipation air duct is formed within the housing 110 for air to enter from the air inlet 112, pass through the motor 170, the first fan 180, and the second fan 190, and exhaust from the air outlet 114.

[0047] Specifically, referring to Figure 1 the placement method, it should be noted that the "upper", "lower", "horizontal", "vertical", etc. mentioned in the embodiments of the present invention are all described based on Figure 1 the placement method shown. When the placement method of the sander 100 changes, the substantial relationship between the various structures of the sander 100 does not change. Figure 1 The position shown is also the posture of the sander 100 during normal operation, that is, in the vertical direction, the working base plate 160 is located at the bottom of the sander 100 so that the housing 110 can be held and the workpiece can be polished using the working base plate 160.

[0048] Overall, on one side inside the housing 110 is the motor 170. The higher part of the motor 170's own structure is set as the tail end B, and the lower part of the motor 170's own structure is set as the head end A. At a position near the tail end B, an air inlet 112 is provided on the housing 110. Below the position near the head end A, a first fan 180 is provided. The first fan 180 is arranged on the output shaft 174 of the motor 170. The transmission shaft 150 is arranged side by side on one side of the motor 170, that is, the axes of the transmission shaft 150 and the output shaft 174 are parallel. Compared with the traditional vertical placement method of the motor and the transmission shaft, the height H of the housing 110 is reduced, making the structure more compact. A second fan 190 is provided on the transmission shaft 150. Horizontally, there is no interference between the second fan 190 and the first fan 180. At a position near the second fan 190, an air outlet 114 is provided on the housing 110. The working base plate 160 is eccentrically arranged below the transmission shaft 150, and a balance weight 156 is also provided on the working base plate 160 to ensure the stable state of the working base plate 160 during operation. Through the connection between the output shaft 174 of the motor 170 and the transmission shaft 150, the transmission shaft 150 drives the working base plate 160 to move, thereby performing the work of the sander 100. In addition, the air inlet 112 and the air outlet 114 can be pores with a larger area or multiple pores with a smaller area. There is no limitation on the external shape of the air inlet 112 and the air outlet 114, as long as the purpose of air intake and exhaust can be achieved. At the same time, Figure 1 The positions of the illustrated air inlet 112 and air outlet 114 are only the methods adopted in this embodiment, and they can also be set at other positions. For example, air outlets 114 are provided around the housing 110 at a position near the second fan 190.

[0049] From the above description of the overall structure of the sander 100, it can be seen that a smooth heat dissipation air duct is formed from the air inlet 112, the motor 170, the first fan 180, the second fan 190, and the air outlet 114. Airflow is inhaled from the air inlet 112, passes through the motor 170, takes away a large amount of heat, and cools the motor 170. The first fan 180 plays a role in guiding the airflow, controls the flow path of most of the airflow, and then transmits it to the second fan 190 and is discharged through the air outlet 114, accelerating the fluidity of the airflow. The entire heat dissipation air duct has a short path, large fluidity, and high heat dissipation efficiency. In this embodiment, the heat dissipation air duct can be understood as including the airflow flowing through the inside of the housing of the motor 170 and the airflow flowing through the outside of the housing of the motor 170. Of course, these two methods can exist simultaneously or alternatively. In addition, in this embodiment, the transmission shaft 150 is arranged side by side on one side of the motor 170, making the overall structure more compact, reducing the height H of the housing 110, making the housing 110 closer to the lower part of the holding part 140, and improving the space utilization rate.

[0050] The sander 100 further includes a battery pack 130 connected to the main body, which supplies power for the operation of the sander 100. A holding portion 140 is also provided on the main body. The holding portion 140 is connected to the housing for mounting the battery pack 130, making the structure more compact. The holding portion 140 facilitates the operator to hold, improving work efficiency.

[0051] The working base plate 160 includes a circular sander base plate and a flat sander base plate, and the circular sander base plate and the flat sander base plate are alternatively mounted at one end of the machine housing 110. When the working base plate 160 is the circular sander base plate, it performs a regular orbital motion of revolution plus rotation, which is suitable for grinding a large amount of materials. When the working base plate 160 is the flat sander base plate, it performs a regular orbital motion of revolution, which is suitable for grinding a small amount of materials, such as for fine machining or finishing. According to the two working conditions of rough grinding and fine grinding, the type of the working base plate 160 is selected.

[0052] In the above sander 100, a heat dissipation air duct is formed that takes in air from the air inlet 112, passes through the motor 170, the first fan 180, and the second fan 190, and exhausts air from the air outlet 114. The first fan 180 plays a role in guiding the air flow, controlling the flow path of most of the air flow, and then transmitting it to the second fan 190, accelerating the fluidity of the air flow and exhausting it from the air outlet 114. The entire heat dissipation air duct has a shorter path and is smoother. In addition, the transmission shaft 150 is arranged side by side with the motor 170, which also reduces the height H of the machine housing 110, making the overall structure more compact and improving the space utilization rate.

[0053] In one embodiment, referring to Figure 1 , at a position close to the air inlet 112 on the machine housing 110, an air inlet hole 176 is provided on the housing of the motor 170. Specifically, the air inlet hole 176 is provided at the tail end B of the motor 170, and the number and shape of the air inlet hole 176 are not limited. On the premise of ensuring the strength of the housing, multiple air inlet holes 176 can be provided, and the shape can be circular, oval, rectangular, etc. The heat source of the motor 170 is the motor core 172. A plurality of air inlet holes 176 are provided on both the top wall and the side wall of the housing, enabling more air flow to flow through the inside of the housing of the motor 170 to cool and dissipate heat from the motor core 172. Of course, the air flow inhaled from the air inlet 112 will also flow through the outside of the housing of the motor 170, improving the heat dissipation capacity.

[0054] In one embodiment, a first pulley 1801 is further provided on the output shaft 174, and a second pulley 198 is further provided on the transmission shaft 150. The second pulley 198 is driven by the first pulley 1801 through a belt. It can be understood that the first pulley 1801 can be provided above or below the first fan 180.

[0055] In one of the embodiments, referring to Figure 3, the first pulley 1801 is arranged below the first fan 180. The second fan 190 includes a second frame body 192. The second frame body 192 is provided with a second pulley 198. The second pulley 198 and the first pulley 1801 are driven by a belt. As Figure 1 and Figure 2 shown, the first pulley 1801 is arranged below the first fan 180 to ensure that there is no interference between the multiple fan blades 184 of the first fan 180 and the first pulley 1801. The projected contour size of the first pulley 1801 on the first fan 180 is smaller than the contour size of the first fan 180, so that the first fan 180 generates greater suction and exhaust forces. The second pulley 198 and the second frame body 192 can be integrally formed or have other fixed relationships. The outer circle radial dimensions of the first pulley 1801 and the second pulley 198 are determined according to the actual required transmission ratio. The greater the transmission ratio, the greater the difference in the outer circle radial dimensions between the first pulley 1801 and the second pulley 198. The first pulley 1801 is driven by the output shaft 174 of the motor 170 and serves as the driving pulley in the belt drive. Generally, its outer circle radial dimension is smaller. The second pulley 198 is rotated by the belt drive and serves as the driven pulley in the belt drive. Generally, its outer circle radial dimension is larger, that is, a larger transmission ratio is achieved. The high-speed rotation of the first pulley 1801 is used to achieve the purpose of the low-speed rotation of the second pulley 198.

[0056] In addition, in terms of the height H of the machine shell 110, the heights of the first pulley 1801 and the second pulley 198 are basically the same, ensuring the reliability and stability of the transmission. Of course, on the premise of no interference, gear transmission can also be used. However, gear transmission is prone to phenomena such as fatigue fracture of gear teeth, requiring replacement of new gears, which is troublesome to operate and has a higher cost. Moreover, more heat is generated during gear meshing, bringing unnecessary heat sources. In comparison, during belt transmission, only the belt needs to be replaced, which has a low price, is convenient to operate, generates less heat, and has little negative impact on the working process.

[0057] Further, the first fan 180 includes a first frame body 182. The first frame body 182 is provided with a first fixing member 186. The first pulley 1801 is provided with a through hole 1803 that cooperates with the first fixing member 186. The first fixing member 186 cooperates with the through hole 1803 to limit the relative axial movement between the first frame body 182 and the first pulley 1801. The first frame body 182 cooperates with the output shaft 174 through the first pulley 1801. The first pulley 1801 has a first connection hole 1804 arranged along the axial direction, and the first connection hole 1804 cooperates with the output shaft 174. Specifically, the first fan 180 includes a first frame body 182 and a plurality of fan blades 184. A first fitting hole 188 is provided on the first frame body 182. The axis of the first fitting hole 188 coincides with the axis of the first fan 180. The contour of the cross-sectional shape of the first fitting hole 188 is neatly concave-convex. In this embodiment, 4 concave portions and 4 convex portions are evenly provided and arranged in a crosswise manner in sequence to form a shape that connects head to tail. Such concave-convex cooperation can also prevent slipping. 4 first fixing members 186 are also evenly provided on the first frame body 182. These 4 first fixing members 186 are of the hot-melt fixing nature, that is, after the cooperation is completed, the extra parts can be heated and melted to form a larger hot-melt portion, ensuring the reliability of the cooperation and playing a fixing role in the axial cooperation between the first fan 180 and the first pulley 1801.

[0058] Correspondingly, the first pulley 1801 is further provided with a first fitting portion 1802 that matches the first fitting hole 188 along the axial direction to transmit torque. The first connection hole 1804 is arranged along the axial direction of the first fitting portion 1802, and the first connection hole 1804 is in interference fit with the output shaft 174, achieving the purpose that the output shaft 174 can drive the first pulley 1801 to rotate, that is, playing a fixing role in the radial cooperation between the first fan 180 and the first pulley 1801. The first pulley 1801 is also provided with a through hole 1803 that matches the first fixing member 186. The number of through holes 1803 is the same as the number of first fixing members 186. In this embodiment, the number of through holes 1803 is 4. After the installation is completed, the first fitting portion 1802 cooperates with the first fitting hole 188, the first fixing member 186 cooperates with the through hole 1803, and the first connection hole 1804 cooperates with the output shaft 174. The effects that can be achieved by the above method are: the output shaft 174 of the motor 170 rotates, driving the first pulley 1801 to rotate. The first pulley 1801 drives the first fan 180 to rotate. At the same time, the first pulley 1801 drives the second pulley 198 to rotate through belt transmission, and the second pulley 198 rotates to drive the entire second fan 190 to rotate.

[0059] Further, referring to Figure 3 and Figure 4, on the surfaces of the first pulley 1801 and the second pulley 198 that cooperate with the belt, a plurality of tooth-ridge structures 1805 are provided. The surfaces that cooperate with the belt, that is, the surfaces that carry the belt, on the surfaces of the first pulley 1801 and the second pulley 198 that cooperate with the belt, a plurality of uniformly arranged tooth-ridge structures 1805 are provided. The tooth-ridge structure 1805 is similar to a tooth, but the addendum height and the dedendum height are smaller. When the belt contacts the plurality of tooth-ridge structures 1805, the frictional force is larger, which can ensure the accuracy of belt transmission, ensure the transmission ratio, and prevent the belt from slipping during transmission.

[0060] Furthermore, the second skeleton body 192 is further provided with a first fan blade 194. The first fan blade 194 is close to the second pulley 198 and the first fan blade 194 is close to the air outlet 114. The second skeleton body 192 and the first fan blade 194 are also integrally formed, and the first fan blade 194 is provided in plurality. In order to prevent interference between the second pulley 198 and the first fan blade 194 in the horizontal and vertical directions, and at the same time to enable the second fan 190 to obtain a larger suction force and exhaust force, the highest point of the first fan blade 194 is lower than the lowest point of the second pulley 198. The first fan blade 194 is close to the air outlet 114, which is convenient for discharging the air flow flowing from the first fan 180 out of the casing 110 faster, accelerating the fluidity of the air flow, and improving the heat dissipation speed.

[0061] Furthermore, the second skeleton body 192 is further provided with a second fan blade 196. The second fan blade 196 is close to the first fan blade 194, and the air suction directions of the second fan blade 196 and the first fan blade 194 are opposite. Both the second fan blade 196 and the first fan blade 194 are provided with a plurality of fan blades. The plurality of fan blades of the second fan blade 196 and the first fan blade 194 are arranged around the axis of the second fan 190 but have opposite helix directions, and at a position close to the second fan blade 196, the sander 100 is further provided with a dust collection device 120.

[0062] Specifically, the second frame body 192 and the second fan blades 196 are also integrally formed, and the number of the second fan blades 196 is set to be plural. Overall, the second fan 190 includes a second pulley 198 integrally formed with the second frame body 192, a first fan blade 194, and second fan blades 196. At the same time, the arrangement order of the second pulley 198, the first fan blade 194, and the second fan blades 196 is also like this. The first fan blade 194 and the second fan blades 196 are arranged on the upper and lower sides of the frame body 192, and the first fan blade 194 and the second fan blades 196 do not cross in the vertical direction. At a position close to the second fan blades 196, a dust collection device 120 is provided on the sander 100 for collecting dust particles and the like absorbed by the second fan blades 196 from the working base plate 160. The first fan blade 194 inhales the air flow flowing from the first fan 180 and discharges it from the air outlet 114, while the second fan 190 inhales dust particles and the like from the working base plate 160 and discharges them to the dust collection device 120. It can be seen that the air suction directions of the first fan blade 194 and the second fan blades 196 are opposite. Therefore, the multiple fan blades of the second fan blades 196 and the first fan blade 194 are arranged around the axis of the second fan 190, but the rotation directions are opposite, that is, when the second fan 190 rotates around the axis, the rotation directions of the second fan blades 196 and the first fan blade 194 are the same, but due to the opposite rotation directions of the multiple fan blades, the air suction directions are also opposite. In this embodiment, referring to Figure 4 , the rotation arrangement mode of the multiple fan blades of the first fan blade 194 is left-handed, and the rotation arrangement mode of the multiple fan blades of the second fan blades 196 is right-handed. In other words, the inclination directions of the first fan blade 194 and the second fan blades 196 on both sides of the second frame body 192 are opposite. Referring to Figure 4 , the first fan blade 194 is biased to the left, and the second fan blades 196 are biased to the right. Of course, in this embodiment, the number of the multiple fan blades is not limited, including the extreme case where there is only one fan blade.

[0063] It should be noted that the vertical positional relationship between the first pulley 1801 and the first fan 180, and the vertical relationships between the second pulley 198 and the first fan blade 194 and the second fan blades 196 are optional and not limited by the above embodiments, as long as there is no interference between the structures. In the above embodiment, the first pulley 1801 is located below the first fan 180, the second pulley 198 is located above the first fan blade 194, and the first fan blade 194 is located above the second fan blades 196. Since the heights of the first pulley 1801 and the second pulley 198 are basically the same, in this structural layout, the height H2 of the second fan 190 is greater than the height H1 of the first fan 180, that is, the second fan 190 is closer to the working base plate 160 than the first fan 180. In this way, the second fan 190 is relatively far from the holding part 140, and when the operator operates, it is not easy to be injured by the hot air flow, improving the operation safety.

[0064] In one embodiment, referring to Figure 4 , the sander 100 further includes a second fixing member 1982. The second fixing member 1982 is connected to the second fan 190 and also cooperates with the transmission shaft 150. The second fixing member 1982 has a second connection hole 1984 arranged along the axial direction, and the second connection hole 1984 cooperates with the transmission shaft 150. Specifically, the second fan 190 is provided with a second fitting hole 1981 along the axial direction, and the second fixing member 1982 is provided with a second fitting portion 1983 that cooperates with the second fitting hole 1981 to transmit torque. To prevent the second fixing member 1982 and the second fan 190 from slipping during synchronous rotation, there is a partially concave-convex fit between the second fitting hole 1981 and the second fitting portion 1983. The second fitting portion 1983 is provided with a second connection hole 1984 along the axial direction, and the second connection hole 1984 has an interference fit with the transmission shaft 150 to ensure the reliability of transmission and prevent slipping. Usually, the second fixing member 1982 and the second fan 190 are fixed together by injection molding to form an integral part, preventing the connection between the second fixing member 1982 and the second fan 190 from being loose and failing during operation.

[0065] Furthermore, referring to Figure 2 , the sander 100 further includes a connecting member disposed inside the machine housing 110. The connecting member cooperates with the transmission shaft 150, and the transmission shaft 150 is connected to the working base plate 160 through the connecting member. The transmission shaft 150 has a third connection hole 158 arranged along the axial direction, and the third connection hole 158 cooperates with the connecting member. The connecting member is connected to the working base plate 160 through a balance weight 156. Specifically, the transmission shaft 150 is supported and fixed by a locking block 152, bearings, etc. to prevent the transmission shaft 150 from shifting. In this embodiment, the connecting member is in the form of a connecting rod 154. One end of the connecting rod 154 has a stepped radial dimension. At the portion with a larger radial dimension, it is clamped above the transmission shaft 150. The connecting rod 154 has an interference fit with the third connection hole 158 to ensure the reliability of transmission. One of the functions of the transmission shaft 150 is to limit the movement of the connecting rod 154. The other end of the connecting rod 154 is threadedly connected to the balance weight 156 to ensure the connection stability of the working base plate 160. Referring to Figure 5, the second fixing member 1982 also has a third fitting hole 1985, which is connected to the balance weight 156 through the spline sleeve 159. The surface of the third fitting hole 1985 connected to the balance weight 156 has a plurality of tooth ridges. The balance weight 156 is connected to the working base plate 160 to drive the working base plate 160. A plurality of tooth ridges are provided on the third fitting hole 1985, which are tightly connected to the spline sleeve 159 to prevent slipping between the third fitting hole and the spline sleeve 159, ensuring the reliability of the transmission. At the same time, the axis of the connecting rod 154 does not coincide with the axis of the working base plate 160, that is, the working base plate 160 is eccentrically arranged. The balance weight 156 can prevent the working base plate 160 from shaking during work, ensuring the stability of the working state. The effect that the above approach can achieve is: the second fan 190 drives the second fixing member 1982 to rotate, the second fixing member 1982 drives the spline sleeve 159 to rotate, and the spline sleeve 159 drives the working base plate 160 to move through the balance weight 156.

[0066] In one embodiment, both the first fan 180 and the second fan 190 are centrifugal fans. The working modes of the first fan 180 and the second fan 190 are both axial air intake and radial air exhaust. The plurality of fan blades 182 of the first fan 180, the plurality of first fan blades 194 and the plurality of second fan blades 196 of the second fan 190 are all arranged uniformly in the vertical direction. For the first fan 180, the air flow passes through the air inlet 112 via the inside and outside of the motor 170, taking away a large amount of heat to cool the motor 170. And due to the characteristics of axial air intake and radial air exhaust of the first fan 180, the flow path of the air flow is smoother, playing a guiding role. For the second fan 190, the air flow flowing out of the first fan 180 is axially inhaled by the first fan blades 194 of the second fan 190, then radially discharged, and discharged from the machine shell 110 via the air outlet 114, forming a heat dissipation air duct of air inlet 112 - motor - first fan 180 - second fan 190 - air outlet 114. Since the motor 170 and the transmission shaft 150 are arranged side by side, the heat dissipation air duct is shorter, the heat dissipation speed is faster, and the effect of cooling the motor 170 is good.

[0067] Overall, the side-by-side arrangement of the drive shaft 150 and the motor 170 reduces the overall height H of the housing 110, making the structure more compact. The first fan 180 and the second fan 190 enhance the heat dissipation speed. The heat dissipation air duct formed by the air inlet 112, the motor 170, the first fan 180, the second fan 190, and the air outlet 114 has a relatively short overall heat dissipation air duct path, large fluidity, and high heat dissipation efficiency. When the output shaft 174 of the motor 170 rotates, it drives the first pulley 1801 to rotate. The first pulley 1801 drives the first fan 180 to rotate. At the same time, the first pulley 1801 drives the second pulley 198 to rotate through belt transmission. The second pulley 198 drives the second fan 190 to rotate. The second fan 190 drives the second fixing member 1982 to rotate. The second fixing member 1982 drives the spline sleeve 159 to rotate. The spline sleeve 159 drives the working base plate 160 to move through the balance weight 156. The above entire transmission process is very compact in structure, highly reliable, and improves the space utilization rate.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0069] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A sander, characterized in that, it includes: a housing; a motor disposed within the housing, having opposite head and tail ends, and an output shaft extending from the head end; a transmission shaft, the axis of the transmission shaft is arranged parallel to the axis of the output shaft and is driven to rotate by the output shaft; a working base plate, connected to the transmission shaft and close to the head end; a first fan disposed on the output shaft extending from the head end of the motor and close to the working base plate; a second fan disposed on the transmission shaft and close to the working base plate; wherein, at a position close to the tail end, the housing is provided with an air inlet; at a position close to the second fan, the housing is provided with an air outlet, and a heat dissipation air duct is formed within the housing for air to enter from the air inlet, pass through the motor, the first fan, and the second fan, and exhaust from the air outlet. The first fan sucks air axially and exhausts air radially to guide the air entering from the air inlet to the second fan and then discharge from the air outlet.

2. The sander according to claim 1, characterized in that, at a position close to the air inlet, an air inlet hole is provided on the housing of the motor.

3. The sander according to claim 1, characterized in that, a first pulley is further provided on the output shaft, a second pulley is further provided on the transmission shaft, and the second pulley is driven by a belt in cooperation with the first pulley.

4. The sander according to claim 3, characterized in that, the first fan includes a first skeleton body, the first skeleton body is provided with a first fixing member, the first pulley is provided with a through hole cooperating with the first fixing member, and the first fixing member cooperates with the through hole to limit the relative axial movement between the first skeleton body and the first pulley. The first skeleton body is cooperated with the output shaft through the first pulley.

5. The sander according to claim 4, characterized in that, the first pulley has a first connection hole arranged along the axial direction, and the first connection hole cooperates with the output shaft.

6. The sander according to claim 4, characterized in that, the first skeleton body is further provided with a first fitting hole, and the first pulley is provided with a first fitting portion cooperating with the first fitting hole to transmit torque.

7. The sander according to claim 3, characterized in that, the second fan includes a second skeleton body, and the second pulley is disposed on the second skeleton body.

8. The sander according to claim 7, characterized in that, the second skeleton body is further provided with a first fan blade, the first fan blade is close to the second pulley, and the first fan blade is close to the air outlet.

9. The sander according to claim 1, characterized in that, it further includes a second fixing member, and the second fan is cooperated with the transmission shaft through the second fixing member.

10. The sander according to claim 9, characterized in that, the second fixing member is provided with a second fitting portion, and the second fan is provided with a second fitting hole cooperating with the second fitting portion to transmit torque.

11. The sander according to claim 9, characterized in that, The second fixing member has a second connection hole arranged along the axial direction, and the second connection hole is fitted with the transmission shaft.

12. The sander according to claim 9, characterized in that it further comprises a connecting member disposed within the housing, and the transmission shaft is connected to the working base plate through the connecting member.

13. The sander according to claim 12, characterized in that the transmission shaft has a third connection hole arranged along the axial direction, and the third connection hole is fitted with the connecting member.

14. The sander according to claim 12, characterized in that it further comprises a balance weight, and the connecting member is connected to the working base plate through the balance weight.

15. The sander according to claim 14, characterized in that the second fixing member further has a third fitting hole, the third fitting hole is connected to the balance weight through a spline sleeve, and the surface of the third fitting hole connected to the balance weight has a plurality of tooth ridges.

16. The sander according to any one of claims 1 to 15, characterized in that both the first fan and the second fan are centrifugal fans.

Images