Sander

Abstract

The application discloses a sander, comprising: a housing, a bottom plate assembly, an output shaft rotating around a first axis, a motor and a motor shaft extending along a second axis, a first included angle being formed between the first axis and the second axis, the first included angle being less than or equal to 60 degrees. The application improves the balance performance of the sander, reduces vibration and improves the holding experience during operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a polishing tool, in particular to a sander. BACKGROUND

[0002] A sander is a kind of electric tool for polishing. Nowadays, it has become a common way to provide energy input for the sander by a battery pack, but the use of the battery pack also brings some problems, such as: the weight and installation method of the battery pack affect the center of gravity of the sander, and then affect the holding feeling of the operator and the vibration performance when operating. At the same time, the space occupied by the battery pack also has a certain influence on the size of the sander. SUMMARY

[0003] The purpose of the present application is to provide a sander, which aims to make the sander have a good holding experience and reduce the vibration when operating.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a sander, comprising: a housing forming a containing space, the housing forming a holding part for a user to hold; a bottom plate assembly comprising a bottom plate; the sander further comprises: an output shaft driving the bottom plate assembly to rotate, the output shaft rotating around a first axis; a motor driving the output shaft to rotate, the motor comprising a motor shaft extending along a second axis; a first included angle is formed between the first axis and the second axis, and the first included angle is less than or equal to 60 degrees.

[0005] In an embodiment, the holding part is gradually tapered into a tapered part below, and the motor is at least partially located above the tapered part.

[0006] In an embodiment, the output shaft is supported by a first bearing and a second bearing, and there is a shaft bushing between the first bearing and the second bearing.

[0007] In an embodiment, the motor and the output shaft are connected by a transmission shaft, and at least part of the transmission shaft is a flexible part.

[0008] In an embodiment, the distance between the bottom plate of the sander and the top of the housing is a first height, and the first height is less than or equal to 120 mm.

[0009] In an embodiment, the distance between the first axis and the first surface of the battery pack combination part is a first distance, and the first distance is less than or equal to 49 mm.

[0010] In an embodiment, when the battery pack is installed to the sander, the distance between the top of the battery pack and the top of the housing is a second distance, and the second distance is less than or equal to 25 mm.

[0011] In one embodiment, when the battery pack is engaged with the battery pack joint of the sander, the projection of the center of gravity of the battery pack on the rear surface of the battery pack is located at a first position; when the sander is not connected with the battery pack, the projection of the center of gravity of the sander on the rear surface of the battery pack is located at a second position; a first plane passing through the second axis is defined, and the first plane is substantially perpendicular to the rear surface of the battery pack, and the first position and the second position are located on two sides of the first plane, respectively.

[0012] In one embodiment, the sander comprises a bearing frame, and the bearing frame is made of a metal material.

[0013] In one embodiment, the sander comprises an extreme speed key, and by operating the extreme speed key, the rotation speed of the bottom plate assembly is directly adjusted to the maximum rotation speed.

[0014] In one embodiment, the first included angle is greater than or equal to 5 degrees and less than or equal to 30 degrees.

[0015] The application also provides a sander, comprising: a housing forming an accommodation space, the housing forming a holding portion for a user to hold; a bottom plate assembly comprising a bottom plate; the sander further comprises: an output shaft driving the bottom plate assembly to rotate, the output shaft rotating about a first axis; a motor driving the output shaft to rotate, the motor comprising a motor shaft extending along a second axis; a transmission shaft connecting the motor shaft and the output shaft, at least a portion of the transmission shaft being a flexible portion that is bendable.

[0016] In one embodiment, the transmission shaft transmits the rotation speed and the torque output by the motor shaft to the output shaft.

[0017] In one embodiment, the first end of the transmission shaft is connected to the motor shaft to rotate together through a first conversion member, and the second end of the transmission shaft is connected to the output shaft to rotate together through a second conversion member.

[0018] In one embodiment, the transmission shaft is made of a ferrocarbon alloy, and the carbon content in the ferrocarbon alloy is greater than or equal to 0.65% and less than or equal to 0.75%, where the carbon content refers to the mass fraction of carbon in the ferrocarbon alloy.

[0019] In one embodiment, the hardness of the transmission shaft is greater than or equal to 35HRC and less than or equal to 40HRC, where the unit of hardness HRC is Rockwell hardness.

[0020] The application also provides a sander, comprising: a housing forming an accommodation space, the housing forming a holding portion for a user to hold; a bottom plate assembly comprising a bottom plate; the sander further comprises: a motor, a transmission assembly connecting the motor and the bottom plate assembly, the transmission assembly driving the bottom plate assembly to rotate, and at least a portion of the transmission assembly being a flexible portion that is bendable.

[0021] In one embodiment, the transmission component includes: a motor shaft about which the motor rotates; an output shaft that drives the base plate assembly to rotate; and a transmission shaft that connects the motor shaft and the output shaft.

[0022] In one embodiment, at least two of the motor shaft, transmission shaft, and output shaft are integrally formed.

[0023] The beneficial effects of this technical solution are as follows: by arranging the motor shaft and output shaft at an angle, the motor tilts in one direction, thus providing space for the battery pack insertion and facilitating a smaller sander size. Simultaneously, the tilted motor also helps improve the sander's balance, reduces vibration, and enhances the handling experience during operation. Attached Figure Description

[0024] Figure 1 It is a 3D view of a sander with a battery pack installed.

[0025] Figure 2 yes Figure 1 A 3D view of the sander without the battery pack installed.

[0026] Figure 3 yes Figure 1 A 3D view of the internal structure of a sander;

[0027] Figure 4 yes Figure 1 A cross-sectional view of a sander in the image;

[0028] Figure 5 yes Figure 4 A partially enlarged view of the cross-sectional view of the sander in the image;

[0029] Figure 6 yes Figure 1 Side view of the sander in the image;

[0030] Figure 7 yes Figure 1 A stereoscopic view of the sander from another perspective;

[0031] Figure 8 It is a 3D view of the dust collection component;

[0032] Figure 9 yes Figure 8 A three-dimensional view of the dust collection component from another perspective;

[0033] Figure 10 yes Figure 1 A schematic diagram of the airflow path of the sander in the image;

[0034] Figure 11 This is a perspective view of a sander with a battery pack installed in another embodiment;

[0035] Figure 12 is Figure 11 a perspective view of the internal structure of the sander in

[0036] Figure 13 is Figure 12 a perspective view of the sander in

[0037] Figure 14 is Figure 1 a schematic view of the speed regulating switch of the sander in

[0038] Figure 15 is a perspective view of another embodiment of the sander of the present application;

[0039] Figure 16 is Figure 15 a perspective view of the transmission case in

[0040] Figure 17 is Figure 15 a perspective view of the power supply operating member and switch box in

[0041] Figure 18 is Figure 17 an exploded schematic view of the structure in DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0043] In the description of the present application, it should be noted that the terms “center”, “upper”, “lower”, “left”, “right”, “front”, “back” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first”, “second” and the like are only used to distinguish different structures or components, and cannot be understood as indicating or implying relative importance.

[0044] As shown in Figure 1 , the sander 10 comprises a housing 300, a bottom plate assembly 500, an output shaft 140 and a battery pack joint 210. The sander 10 is connected with the battery pack 200, and through the energy provided by the battery pack 200, the bottom plate assembly 500 is finally driven to eccentric rotation, realizing the sanding effect.

[0045] In some embodiments, the power operation member 410 is used to control the start and stop of the motor 100, and the power operation member 410 is located at the front of the housing 300 of the sander 10, or in other words, the power operation member 410 is located at the front of the holding portion 330 of the sander 10. The sander 10 further comprises a speed adjustment switch 420, which is used to adjust the rotation speed of the bottom plate assembly 500 when the bottom plate assembly 500 is working.

[0046] As shown in Figure 1 and Figure 2 , the housing 300 comprises a first housing 310 and a second housing 320, and the upper end of the housing 300 forms a holding portion 330 for holding. When the operator operates the sander 10, the hand is placed on the holding portion 330 at the top of the housing 300 to control the movement direction of the sander 10, and the hand can also be slightly pressed downward to apply appropriate pressure to the sander 10 to enhance the polishing effect. The surface of the holding portion 330 is curved, which can hold the palm of the operator's hand. In this embodiment, the operator places the palm of the hand against the top end of the holding portion 330, and the fingers wrap around the holding portion 330, but avoid the vicinity of the power operation member 410 to avoid accidentally touching the power operation member 410. As shown in Figure 3 , the lower part of the holding portion 330 is a tapered portion 333, and the motor 100 is at least partially located above the tapered portion 333. In this embodiment, the motor 100 is mostly located above the tapered portion 333.

[0047] The sander 10 is provided with a battery pack combination portion 210, which cooperates with the battery pack 200 to complete the transmission of energy and signals. The battery pack combination portion 210 is provided with a sliding groove 213 on both sides, and the battery pack 200 is slid into the battery pack combination portion 210 through the sliding groove 213. The battery pack combination portion 210 comprises a first surface 211, which is in contact with the battery pack 200 or maintains a certain gap between the battery pack 200. The battery pack combination portion 210 is provided with a male terminal, which is inserted into the female terminal on the battery pack 200. In some embodiments, the specific structure of the battery pack combination portion 210 can be different from the embodiment.

[0048] As shown in Figure 3 and Figure 4 , the housing 300 forms an accommodation space 301, and the motor 100 is accommodated in the accommodation space 301. The energy provided by the battery pack 200 drives the rotation of the motor 100, and the rotation of the motor 100 drives the rotation of other transmission structures inside the housing 300, thereby driving the eccentric rotation of the bottom plate assembly 500. In this embodiment, the motor 100 is an external rotor motor, and the external rotor of the motor 100 rotates around the motor shaft 110.

[0049] As shown in Figure 4 and Figure 5As shown, the sander 10 includes an output shaft 140 that drives the bottom plate assembly 500 in eccentric rotation. The output shaft 140 rotates about a first axis 141, and the motor shaft 110 extends along a second axis 111, the first axis 141 and the second axis 111 forming a first included angle a, the first included angle a being less than or equal to 60 degrees. In some embodiments, the first included angle a is less than or equal to 45 degrees. In some embodiments, the first included angle a is less than or equal to 30 degrees. In some embodiments, the first included angle a is greater than 5 degrees and less than 30 degrees. In Figure 4 In the illustrated embodiment, the first included angle a is greater than 10 degrees and less than 15 degrees.

[0050] The sander 10 includes a transmission shaft 130 that connects the motor shaft 110 and the output shaft 140, and transmits the rotational speed and torque output by the motor shaft 110 to the output shaft 140. The transmission shaft 130 has a first end 131 connected to the motor 100 and a second end 132 connected to the output shaft 140. During rotation of the outer rotor of the motor 100, the motor shaft 110 is also driven to rotate, the first end 131 of the transmission shaft 130 is connected to the motor shaft 110 through the first conversion piece 120, and the second end 132 of the transmission shaft 130 is connected to the output shaft 140 through the second conversion piece 150. The two ends of the transmission shaft 130 have specific shapes that are matched with the openings of the first conversion piece 120 and the second conversion piece 150, respectively, so that the transmission shaft 130 rotates synchronously with the first conversion piece 120 and the second conversion piece 150. At the same time, the first conversion piece 120 and the second conversion piece 150 are inserted into the interiors of the motor shaft 110 and the output shaft 140, respectively, and the first conversion piece 120 and the motor shaft 110 do not rotate relative to each other, and the second conversion piece 150 and the output shaft 140 also do not rotate relative to each other.

[0051] In the present embodiment, the transmission shaft 130 includes at least a flexible portion 133 that is bendable. In some embodiments, the flexible portion 133 can be an iron-carbon alloy having a carbon content greater than or equal to 0.65% and less than or equal to 0.75%, where the carbon content refers to the mass fraction of carbon in the iron-carbon alloy. In some embodiments, the hardness of the transmission shaft is greater than or equal to 35 HRC and less than or equal to 40 HRC, where the unit HRC of the hardness is Rockwell hardness.

[0052] In some embodiments, the transmission shaft 130 can also include a coupling to achieve transmission of rotational speed and torque when the first axis 141 and the second axis 111 form a certain included angle.

[0053] The motor 100 is tilted forward by the angle between the first axis 141 of the output shaft 140 and the second axis 111 of the motor shaft 110, i.e. the motor 100 is tilted away from the battery pack 200. In the present embodiment, the distance between the center of gravity of the motor 100 and the first axis 141 of the output shaft 140 is 3mm. The tilting of the motor 100 leaves a certain space for the circuit board 250 and electronic components disposed on the circuit board 250. In the present embodiment, the circuit board 250 is disposed between the motor 100 and the battery pack 200. The forward tilting of the center of gravity of the motor 100 improves the balance of the whole machine, which is conducive to reducing vibration and improving the holding experience.

[0054] In some embodiments, the motor 100 is tilted backward, thereby leaving more space for the power operation member 410 at the front end.

[0055] As shown in Figure 4 , the surface of the battery pack 200 facing the rear side of the sander 10 is the rear surface 201 of the battery pack 200, which defines a first plane 212 passing through the first axis 141 of the output shaft 140, and the first plane 212 is substantially perpendicular to the rear surface 201 of the battery pack 200. The first plane 212 divides the housing 300 of the sander 10 into two substantially symmetrical parts. In the present embodiment, the first plane 212 passes through the center of the power operation member 410 and substantially symmetrically "cuts" the housing assembly 300 along the junction of the first housing 310 and the second housing 320.

[0056] The intersection of the first surface 211 of the battery pack combination part 200 and the first plane 212 produces a first intersection line 501, and the distance between the first axis 141 and the first intersection line 501 is a first distance L1. That is, the distance between the first axis 141 and the first surface 211 (see Figure 2 ) of the battery pack combination part 210 is the first distance L1. In some embodiments, the first distance L1 is greater than 47mm and less than or equal to 49mm. In some embodiments, the first distance L1 is greater than or equal to 45mm and less than or equal to 47mm. In some embodiments, the first distance L1 is greater than or equal to 43mm and less than 45mm.

[0057] In the present embodiment, the second axis 111 of the motor 100 and the first axis 141 of the output shaft 140 are both located outside the first plane 212. In some embodiments, the second axis 111 of the motor 100 is not completely located on the first plane 212, i.e. the motor 100 can be tilted left or right relative to the first plane 212.

[0058] As shown in Figure 5As shown, the upper part of the output shaft 140 is supported by a first bearing 610 and a second bearing 620, with a bushing 660 between them. The top of the motor shaft 110 is supported by a third bearing 630, and the bottom of the motor shaft 110 is supported by a fourth bearing 640. The lower part of the output shaft 140 is connected to a balance block 520, which is supported by a fifth bearing 650. The use of a double bearing system (first bearing 610 and second bearing 620) in conjunction with the bushing 660 makes the output shaft 140 more stable during eccentric oscillations and improves the bearing life.

[0059] In some embodiments, the first bearing 610, the second bearing 620, and the bushing 660 are sealed within the bearing housing 710, and the lower end of the motor shaft 110 and the upper end of the output shaft 140 are sealed by a first sealing rib 321 and a second sealing rib 322 located on the housing 300. By providing sealing ribs on the housing 300, dust from the sander 10 during operation is prevented from entering the movement space of the transmission shaft 130, thereby improving the service life of the transmission shaft 130. In practical applications, the exterior of the transmission shaft 130 is typically moistened with grease before being installed into the motor shaft 110 and sealed by the sealing ribs on the housing 300.

[0060] This application also discloses a sander, including a transmission assembly 600, which connects a motor 100 and a base plate assembly 500. The transmission assembly 600 drives the base plate assembly 500 to rotate, and at least a portion of the transmission assembly 600 is a flexible, bendable part 133. In one embodiment, the transmission assembly 600 includes a motor shaft 110, an output shaft 150, and a transmission shaft 130. The motor 100 rotates about the motor shaft 110, the output shaft 150 drives the base plate assembly 500 to rotate, and the transmission shaft 130 connects the motor shaft 110 and the output shaft 150. In one embodiment, at least two of the motor shaft 110, the output shaft 150, and the transmission shaft 130 are integrally formed. That is, the motor shaft 110 can be integrally formed with the transmission shaft 130, or the output shaft 150 can be integrally formed with the transmission shaft 130, or all three can be integrally formed.

[0061] like Figure 6 As shown, the distance between the base plate 530 of the sander 10 and the top of the housing 300 is a first height H1. In some embodiments, the first height H1 is less than or equal to 120 mm. In some embodiments, the first height H1 is less than or equal to 120 mm and greater than 115 mm; in some embodiments, the first height H1 is less than or equal to 115 mm and greater than 110 mm; in some embodiments, the first height H1 is less than or equal to 110 mm.

[0062] In some embodiments, when the battery pack 200 is inserted into the sander 10 transversely, the top of the battery pack 200 is lower than or parallel to the top of the housing 300, and the top of the battery pack 200 is generally not higher than the top of the housing 300 when the sander 10 is adapted to different models of the battery pack 200. In the present embodiment, the battery pack 200 is inserted into the battery pack combination part 200 of the sander 10 in a direction parallel to the bottom plate. In some embodiments, the battery pack 200 is inserted into the battery pack combination part 200 of the sander 10 from left to right. By inserting the battery pack 200 transversely, the overall height of the sander 10 is limited, and the effect of not increasing the overall height when replacing the battery pack 200 is achieved.

[0063] The distance between the top of the battery pack 200 and the top of the housing 300 is defined as a second distance L2, and in some embodiments, the second distance L2 is less than or equal to 25 mm.

[0064] As shown in Figure 7 , when the battery pack 200 cooperates with the battery pack combination part 210 of the sander 10, the projection of the center of gravity of the battery pack 200 on the rear surface 201 of the battery pack 200 is located at a first position 21. When the sander 10 is not connected with the battery pack 200, the projection of the center of gravity of the sander 10 on the rear surface 201 of the battery pack 200 is located at a second position 11. The first position 21 and the second position 11 are respectively located on both sides of the first plane 212.

[0065] Through the above structure, the problem of overall balance is effectively improved. In an embodiment, the vibration value of the sander 10 is less than 3 m / s 2 .

[0066] As shown in Figure 8 and Figure 9 , the sander 10 further comprises a dust collection pipe 730 and a dust collection cover 720, the dust collection cover 720 limits the movement of dust in the sander 10, and the dust collection pipe 730 is used to connect with a dust collection bag, and the fan 510 blows the dust polished down into the dust collection bag. In some embodiments, the bearing bracket 710, the dust collection cover 720 and the dust collection pipe 730 are integrally formed to form a dust collection piece 700. In some embodiments, the bearing bracket 710, the dust collection cover 720 and the dust collection pipe 730 are first formed respectively, and then assembled together. In some embodiments, the screw 711 (see Figure 3 ) is passed through the first mounting hole 712 on the bearing bracket 710, so as to fix the bearing bracket 710 and the dust collection cover 720.

[0067] Figure 10 The heat dissipation air path of the sander 10 is disclosed, in combination Figure 2The sanding machine 10 has an air inlet 331 and an air outlet 332. In this embodiment, the air inlet 331 includes at least two substantially flush openings, and the air outlet 332 also includes at least two substantially flush openings. In some embodiments, the air inlet 331 is located on the housing 300 and is distributed along the circumference of the grip 330, and the air outlet 332 is located on the dust collecting cover 720 and is outside the fan 510. The rotation of the fan 510 generates negative pressure, so that the gas outside the sanding machine 10 enters the sanding machine 10 through the air inlet 331, flows downward along the motor 100, flows through the bearing bracket 710, and finally flows out of the sanding machine 10 from the air outlet 332. The flow sequentially takes away the heat generated by the motor 100 and the bearing bracket 710 during the flow.

[0068] In some embodiments, the bearing bracket 710 is made of a metal material. In some embodiments, the bearing bracket 710 is made of an aluminum alloy material. In some embodiments, the dust collecting member 700 is made of a metal material. The bearing bracket 710 made of aluminum is more reliable in bearing fixation, and the heat generated when the bearing moves can be conducted to the aluminum-made bearing bracket 710 and dust collecting cover 720 and dissipated in time, and the static electricity generated by the dust is also improved in the metal-made dust collecting cover 720. In some embodiments, the bearing bracket 710 is made of a zinc alloy material. In some embodiments, the dust collecting pipe 730 can also be made of a plastic material, and is assembled with the metal-made dust collecting cover 720 and bearing bracket 710 for use.

[0069] Figures 11 to 13 The disclosed sanding machine 10a is another embodiment of a sanding machine. The dust collecting cover 720a is part of the first housing 310a and the second housing 320a of the sanding machine 10a, and the lower end of the combination of the first housing 310a and the second housing 320a forms the dust collecting cover 720a. In some embodiments, the housing 300a, the dust collecting cover 720a and the dust collecting pipe 730a are all made of plastic.

[0070] As shown in Figure 11 , the air inlets 331a and 331b are arranged in a substantially vertical manner, so that air enters the sanding machine 10a from as high a position as possible. In this embodiment, the air outlet 332a is in the form of an elongated slot, and the large area of the air outlet 332a is conducive to the rapid discharge of hot air.

[0071] As shown in Figure 12 and Figure 13 , the bearing bracket 710a is fixed to the housing 300a by screws. The battery pack connecting portion 210 is connected to the first housing 310a through the second mounting hole 213. The first surface 211a of the battery pack connecting portion 210a is in substantial contact with the battery pack 200.

[0072] Figure 14An embodiment of the speed regulating switch 420 is disclosed. By adjusting the speed increasing key 421, the speed of the sander 10 can be adjusted from low to high among the first speed, the second speed, the third speed and the fourth speed. When the sander 10 is at different speed gears, the first speed light 423, the second speed light 424, the third speed light 425 and the fourth speed light 426 are lit respectively. When the speed increasing key 421 is operated once, the speed is increased by one gear. When the speed is increased to the fourth speed, if the speed increasing key 421 is operated again, the speed is adjusted back to the first speed. In this embodiment, the speed regulating switch 420 is provided with an extreme speed key 422. By operating the extreme speed key 422, the speed of the bottom plate assembly 500 of the sander 10 is directly increased to the maximum speed, i.e. the fourth speed, and at this time the fourth speed light 426 is lit. The provision of the extreme speed key 422 realizes the rapid adjustment of the speed of the sander 10, and meets the requirements of various working conditions.

[0073] Figures 15 to 18 Another embodiment of the sander 10b is shown in

[0074] As shown in Figure 15 and Figure 16 , the sander 10b comprises a transmission box 900, which accommodates at least the motor 100 and the output shaft 140 and other transmission structures. In this embodiment, the transmission box 900 is composed of an upper transmission box 910 and a lower transmission box 920, which are fixed by screws. Compared with Figure 3 In the disclosed sander 10, the motor 100 and the output shaft 140 are limited by the ribs formed by the housing 300, while Figure 15 The sander 10b shown in is limited by the additionally provided transmission box 900. The advantage of this is that the transmission box 900 does not contact the housing 300, preventing the heat generated by the motor 100 and the output shaft 140 from being transferred to the housing 300, so that the temperature of the housing 300 is not too high to affect the holding experience of the operator.

[0075] As shown in Figure 16 , the top of the upper transmission box 910 of the sander 10b has an upper end 913, and the upper end 913 has a gap with the first housing 310. The upper end 913 is supported by a plurality of support portions 911, and a heat dissipation gap 912 is formed between every two support portions 911, so that each upper transmission box 910 has a plurality of heat dissipation gaps 912. The output shaft 140 is located substantially in the lower transmission box 920.

[0076] Figure 15The mounting method of the speed control switch 420 is also shown. The speed control switch 420 has a protruding edge 427, which is limited by a first limiting portion 311 on the housing 300, similar to the common method of directly attaching the panel of the speed control switch 420 to the housing 300. Figure 15 The revealed structure can effectively prevent the panel of the speed control switch 420 from becoming loose or falling off.

[0077] Figure 17 and Figure 18 The power supply operator 410 and its driving method are shown. For example... Figure 17 As shown, the power operating component 410 has a pivot shaft 411, which is disposed within the second limiting portion 860 of the housing 300. In this embodiment, the second limiting portion 860 is a circular groove. When the user presses the power operating component 410, the spring 810 is compressed, and the switch box 830 is triggered.

[0078] In this embodiment, the fixing plate 820 is used to strengthen the fixation between the switch box 830 and the housing 300. For example... Figure 18 As shown, the fixing plate 820 has two first holes 821 and two second holes 822. The two first holes 821 are fitted onto the two first protrusions 831 of the switch box 830, and the two second holes 822 are fitted onto the two protrusions 851 of the housing 300. The housing 300 has a limiting rib 840, and the switch box 830 has a corner 832, which is limited by the limiting rib 840, and the corner 832 is in direct contact with the limiting rib 840. When the sander is working, it will vibrate, and the corner 832 and the limiting rib 840 will be in a state of mutual collision. When the corner of the switch box 830 is damaged by the limiting rib 840, it will cause the switch box 830 to fail. Therefore, the fixing plate 820 shares the damage caused by the vibration of the sander to the switch box 830, thus extending the service life of the switch box 830.

[0079] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A sander, comprising: a housing forming an accommodation space, the housing forming a holding portion for a user to hold; a base plate assembly comprising a base plate; characterized in that: the sander further comprises: an output shaft driving the base plate assembly to rotate, the output shaft rotating about a first axis; a motor driving the output shaft to rotate, the motor comprising a motor shaft extending along a second axis; a first included angle is formed between the first axis and the second axis, the first included angle being less than or equal to 60 degrees; when a battery pack is connected to a battery pack connecting portion of the sander, a projection of a center of gravity of the battery pack on a rear surface of the battery pack is located at a first position; when the sander is not connected to the battery pack, a projection of a center of gravity of the sander on the rear surface of the battery pack is located at a second position; a first plane passing through the second axis is defined, and the first plane is substantially perpendicular to the rear surface of the battery pack, the first position and the second position being located on two sides of the first plane respectively.

2. Sander according to claim 1, characterized in that a gradually tapered portion is formed below the holding portion, and the motor is at least partially located above the tapered portion.

3. The sander of claim 1, wherein: the output shaft is supported by a first bearing and a second bearing, and a shaft bushing is arranged between the first bearing and the second bearing.

4. The sander of claim 1, wherein: the motor and the output shaft are connected by a transmission shaft, at least a portion of the transmission shaft being a flexible portion.

5. The sander of claim 1, wherein: a distance between the base plate of the sander and a top portion of the housing is a first height, the first height being less than or equal to 120 mm.

6. The sander of claim 1, wherein: the sander further comprises a battery pack connecting portion for connecting a battery pack, a distance between the first axis and a first surface of the battery pack connecting portion is a first distance, the first distance being less than or equal to 49 mm.

7. The sander of claim 1, wherein: when the battery pack is mounted to the sander, a distance between a top portion of the battery pack and a top portion of the housing is a second distance, the second distance being less than or equal to 25 mm.

8. The sander of claim 1, wherein: the sander comprises a bearing bracket, and the bearing bracket is made of a metal material.

9. The sander of claim 8, wherein: the sander comprises a dust collection pipe and a dust collection cover, dust moving in the dust collection cover to the dust collection pipe, the dust collection pipe being used to be connected to a dust collection bag, the bearing bracket, the dust collection cover and the dust collection pipe being integrally formed.

10. The sander of claim 1, wherein: the sander comprises an extreme speed key, and by operating the extreme speed key, a rotating speed of the base plate assembly is directly adjusted to a maximum rotating speed.

11. The sander of claim 1, wherein: the first included angle is greater than or equal to 5 degrees and less than or equal to 30 degrees. 12.A sander, comprising: a housing forming an accommodation space, the housing forming a holding portion for a user to hold; a base plate assembly comprising a base plate; characterized in that: the sander further comprises: an output shaft driving the base plate assembly to rotate, the output shaft rotating about a first axis; a motor driving the output shaft to rotate, the motor comprising a motor shaft extending along a second axis; a transmission shaft connecting the motor shaft and the output shaft, at least a portion of the transmission shaft being a flexible portion; When the battery pack of the sander is combined with the battery pack, the projection of the center of gravity of the battery pack on the rear surface of the battery pack is located at a first position; when the sander is not connected with the battery pack, the projection of the center of gravity of the sander on the rear surface of the battery pack is located at a second position; a first plane is defined through the second axis, and the first plane is substantially perpendicular to the rear surface of the battery pack, and the first position and the second position are located on two sides of the first plane, respectively.

13. The sander of claim 12, wherein: The transmission shaft transmits the rotation speed and torque output by the motor shaft to the output shaft.

14. The sander of claim 12, wherein: The first end of the transmission shaft is connected with the motor shaft through a first conversion member, and the second end of the transmission shaft is connected with the output shaft through a second conversion member.

15. The sander of claim 12, wherein: The transmission shaft is made of an iron-carbon alloy, and the content of carbon in the iron-carbon alloy is greater than or equal to 0.65% and less than or equal to 0.75%, wherein the content of carbon refers to the mass fraction of carbon in the iron-carbon alloy.

16. The sander of claim 12, wherein: The hardness of the transmission shaft is greater than or equal to 35HRC and less than or equal to 40HRC, wherein HRC is the unit of hardness.

17. A sander, comprising: a housing forming a containing space, the housing forming a holding portion for a user to hold; a bottom plate assembly comprising a bottom plate; characterized in that: the sander further comprises: a motor driving an output shaft to rotate, a transmission assembly connecting the motor and the bottom plate assembly, the transmission assembly driving the bottom plate assembly to rotate, and at least a part of the transmission assembly being a flexible portion that is bendable; when the battery pack of the sander is combined with the battery pack, the projection of the center of gravity of the battery pack on the rear surface of the battery pack is located at a first position; when the sander is not connected with the battery pack, the projection of the center of gravity of the sander on the rear surface of the battery pack is located at a second position; a first plane is defined through the second axis, and the first plane is substantially perpendicular to the rear surface of the battery pack, and the first position and the second position are located on two sides of the first plane, respectively.

18. The sander according to claim 17, characterized in that: the transmission assembly comprises: a motor shaft about which the motor rotates; an output shaft driving the bottom plate assembly to rotate; a transmission shaft connecting the motor shaft and the output shaft.

19. The sander of claim 18, wherein: At least two of the motor shaft, the transmission shaft and the output shaft are integrally formed.

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