Surface treatment tool

Abstract

The application discloses a surface treatment tool, which comprises a casing, a motor arranged in the casing, and an eccentric rotating device. The eccentric rotating device comprises a first eccentric part, a second eccentric part and a working head. The first eccentric part is coupled with a shaft of the motor and is driven to rotate by the shaft. The second eccentric part can be mounted to the first eccentric part in at least a first mode or a second mode and is driven to rotate by the first eccentric part. The second eccentric part comprises a working head mounting portion, and the working head is mounted to the working head mounting portion. When the second eccentric part is mounted to the first eccentric part in the first mode, the working head rotates with a first eccentricity. When the second eccentric part is mounted to the first eccentric part in the second mode, the working head rotates with a second eccentricity different from the first eccentricity. Thus, the cost is saved and the user is facilitated to use.

Description

Technical Field

[0001] This application specifically relates to a power tool, and more specifically to a surface treatment tool. Background Technology

[0002] Surface treatment tools play a crucial role in manufacturing, used to improve the physical, chemical, or mechanical properties of material surfaces to meet specific application requirements. One type of surface treatment tool in related technologies is a power tool that performs abrasion using rotating sandpaper, grinding discs, grinding wheels, polishing wheels, etc. Surface treatment tools can be power tools that perform different abrasion functions, such as sanders, polishers, grinders, and angle grinders.

[0003] Taking a sander as an example, in order to improve sanding efficiency and quality, the working head of the sander can perform eccentric motion. The same sander sometimes needs to perform eccentric motion with different eccentric radii, which may bring a cumbersome operating experience to the user when changing the working head.

[0004] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0005] To solve or mitigate the above technical problems, this application adopts the following technical solution.

[0006] A surface treatment tool includes: a housing; a motor disposed within the housing, the motor including a stator, a rotor, and a motor shaft; and an eccentric rotation device including: a first eccentric member coupled to the motor shaft and driven to rotate by the motor shaft; a second eccentric member capable of being mounted to and driven to rotate by the first eccentric member in at least a first or a second manner, the second eccentric member including a working head mounting portion; and a working head mounted to the working head mounting portion. When the second eccentric member is mounted to the first eccentric member in the first manner, the working head rotates with a first eccentric distance; when the second eccentric member is mounted to the first eccentric member in the second manner, the working head rotates with a second eccentric distance different from the first eccentric distance.

[0007] In some embodiments, the first eccentric member, the second eccentric member, and the working head form an integral structure that rotates around the motor shaft, and the balance accuracy is less than or equal to 630 mm / s.

[0008] In some embodiments, the product of the eccentricity of the first eccentric member relative to the motor shaft and the eccentric mass is the first product, and the product of the eccentricity of the second eccentric member and the working head as a whole relative to the motor shaft and the eccentric mass is the second product, and the first product and the second product are substantially equal.

[0009] In some embodiments, the product of the eccentricity of the first eccentric member relative to the motor shaft and the eccentric mass is the first product, and the product of the eccentricity of the second eccentric member and the working head as a whole relative to the motor shaft and the eccentric mass is the second product. The ratio of the first product to the second product is greater than or equal to 0.98 and less than or equal to 1.02.

[0010] In some embodiments, the second eccentric member, excluding the working head mounting portion, is housed within the first eccentric member.

[0011] In some embodiments, in the first approach, the second eccentric member is out of phase with the first eccentric member;

[0012] In the second method, the second eccentric component is in a second phase difference from the first eccentric component.

[0013] In some embodiments, the second eccentric member and the working head form an integral part that rotates about the first central axis, and the balance accuracy is less than or equal to 630 mm / s.

[0014] In some embodiments, the position of the first central axis relative to the motor shaft remains unchanged under different installation methods.

[0015] In some embodiments, the working head mounting portion has a second central axis, which does not coincide with the first central axis.

[0016] In some embodiments, the difference between the first eccentricity and the second eccentricity is greatest when the first phase and the second phase are 180 degrees apart.

[0017] In some embodiments, the working head can be at least a first working head or a second working head with different configurations, wherein the first working head and the second working head have the same mass and centroid position.

[0018] In some embodiments, the second eccentric member can be of two types, wherein the first type of the second eccentric member and the second type of the second eccentric member have different structures, but have the same mass and center of mass position.

[0019] This application also discloses a power tool, comprising: a housing; a motor disposed within the housing, the motor including a stator, a rotor, and a motor shaft; an eccentric rotating device including a first eccentric member coupled to the motor shaft and driven to rotate by the motor shaft; a second eccentric member coupled to the first eccentric member and driven to rotate by the first eccentric member, the second eccentric member including a working head mounting portion; and a working head mounted to the working head mounting portion. The second eccentric member and the working head form an integral structure that rotates around a first central axis, with a balance accuracy less than or equal to 630 mm / s; the working head mounting portion has a second central axis that does not coincide with the first central axis.

[0020] In some embodiments, the motor shaft rotates, and the balance accuracy is less than or equal to 630 mm / s.

[0021] In some embodiments, the product of the eccentricity and eccentric mass of the first eccentric member relative to the motor shaft is approximately equal to the product of the eccentricity and eccentric mass of the entirety formed by the second eccentric member and the working head relative to the motor shaft.

[0022] In some embodiments, the second eccentric element can be coupled to the first eccentric element at least in a first phase or a second phase.

[0023] In some embodiments, when the second eccentric member is coupled to the first eccentric member with the first phase and the second phase respectively, the position of the first central axis relative to the motor shaft remains unchanged.

[0024] In some embodiments, the difference between the first eccentricity and the second eccentricity is greatest when the first phase and the second phase are 180 degrees apart.

[0025] In some embodiments, the difference is twice the distance between the motor shaft and the first centerline.

[0026] In some embodiments, the first eccentricity is the distance between the first central axis and the second central axis plus the distance between the motor shaft and the first central axis, and the second eccentricity is the distance between the first central axis and the second central axis minus the distance between the motor shaft and the first central axis.

[0027] In some embodiments, the working head can be at least a first working head or a second working head with different configurations, wherein the first working head and the second working head have the same mass and centroid position.

[0028] In some embodiments, the second eccentric member can be of two types, wherein the first type of the second eccentric member and the second type of the second eccentric member have different structures, but have the same mass and center of mass position.

[0029] The advantage of this application is that by providing an eccentric rotating device with two mounting methods for power tools and surface treatment tools, users can mount the first and second eccentric components in either the first or second method, thereby allowing the working head to output two or more different eccentric distances. This configuration eliminates the need for two different eccentric rotating devices to achieve two eccentric distances, achieving cost savings and user convenience. Attached Figure Description

[0030] Figure 1 This is a perspective view of the surface treatment tool in the embodiments of this application;

[0031] Figure 2 yes Figure 1 A three-dimensional view of the surface treatment tool shown from another perspective;

[0032] Figure 3 yes Figure 1A three-dimensional view of the internal structure of the surface treatment tool shown.

[0033] Figure 4 yes Figure 3 Exploded view of the structure shown;

[0034] Figure 5 yes Figure 4 An exploded view of the structure shown from another perspective;

[0035] Figure 6 This is a sectional view of the assembly of the first and second eccentric parts;

[0036] Figure 7 This is a schematic diagram of the first eccentric component;

[0037] Figure 8 This is a schematic diagram of the first eccentric part of the second eccentric component;

[0038] Figure 9 This is a schematic diagram of the second eccentric part of the second eccentric component;

[0039] Figure 10 A schematic diagram showing the first eccentric member and the second eccentric member installed in a first manner is shown;

[0040] Figure 11 A schematic diagram showing the first eccentric member and the second eccentric member installed in a second manner is shown;

[0041] Figure 12 This is a schematic diagram of another embodiment of the eccentric rotation device;

[0042] Figures 13a to 13f This is a schematic diagram of the eccentric rotating device in different installation positions; Detailed Implementation

[0043] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0044] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0045] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0046] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0047] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0048] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0049] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0050] This application relates to a power tool capable of outputting eccentric motion. The output component of the power tool is connected to a working attachment, which can perform eccentric motion. This power tool can be a surface treatment tool, such as a sander, polisher, grinder, angle grinder, etc. These surface treatment tools can be equipped with working attachments such as sandpaper, grinding discs, grinding wheels, polishing wheels, etc., that perform eccentric rotational motion to perform grinding operations.

[0051] like Figures 1 to 2 As shown, this application discloses a surface treatment tool 10, including a housing 100, a motor 200, and an eccentric rotating device 300. In this embodiment, the housing 100 includes a first barrel 110 and a second barrel 120. The first barrel 110 is located in front of the second barrel 120, and the first barrel 110 and the second barrel 120 cooperate to form a receiving space for accommodating the motor 200 and the eccentric device 300. The motor 200 is disposed within the housing 100 and includes a stator, a rotor, and a motor shaft 21 that rotates around the motor axis. The eccentric rotating device 300 is mainly housed within the first barrel 110 and is used to achieve eccentric movement.

[0052] The housing 100 also forms a gripping part 130 for the user to hold and a support part 140 for the surface treatment tool 10 to be in a standing position. The bottom surface of the support part 140 forms a battery pack connecting part 160 for connecting a battery pack. The surface treatment tool 10 in this application is powered by a battery pack. It should be noted that the surface treatment tool 10 can also use mains power. The battery pack can be detachably installed to the battery pack connecting part 160 in various directions, which is not limited here. A main switch 150 for controlling the start and stop of the motor 200 is provided above the gripping part 130.

[0053] like Figures 3 to 6As shown, the eccentric device 300 includes a first eccentric member 310, a second eccentric member 320 and a working head 330 coupled to the motor shaft 210. The first eccentric member 310 is directly driven to rotate by the motor shaft 210, the working head 330 is directly connected to the working attachment, and the second eccentric member 320 is located between the first eccentric member 320 and the working head 330.

[0054] like Figures 4 to 8 As shown, the surface treatment tool 10, from back to front, includes a motor 200, a first bearing 460, an elastic element 450, a pressure cap 440, a pressure plate 420, a first eccentric member 310, a second eccentric member 320, and a working head 330. The first eccentric member 310 has a connected first shaft portion 3101 and a first end portion 3102 (see...). Figure 5 The first shaft portion 3101 is shaft-shaped, and the motor shaft 210 extends into the first opening 3103 of the first shaft portion 3101, so that the rotation of the motor shaft 210 directly drives the rotation of the first eccentric member 310. A first bearing 460 is sleeved on the outer side of the first shaft portion 3101, and the first bearing 460 is fixed inside the housing 100. The first end 3102 of the first eccentric member 310 forms a first receiving cavity 3104 for installing the second eccentric member 320. The rotation axis of the part of the first opening 3103 that contacts the motor shaft 210 is substantially coincident with the motor axis 101 (see...). Figure 6 ).

[0055] The second eccentric member 320 is assembled from the first eccentric portion 321 and the second eccentric portion 322. In this embodiment, the first eccentric portion 321 extends entirely into the interior of the first eccentric member 310. The first eccentric portion 321 is composed of a connected second shaft portion 3211 and a second end portion 3212. The second shaft portion 3211 extends into the first shaft portion 3101, so that the second shaft portion 3211 is driven to move by the rotation of the first eccentric member 310. The second shaft portion 3221 is installed to the first eccentric member 310 with the first central axis 102 as the central axis. The first central axis 102 does not coincide with the motor axis 101 and is spaced apart by a first distance L (see...). Figure 9 and Figure 10 The second end portion 3212 of the first eccentric portion 321 forms a second receiving cavity 3213 for accommodating a portion of the structure of the second eccentric portion 322.

[0056] The second eccentric portion 322 is composed of a connected third shaft portion 3221 and a third end portion 3222. The third shaft portion 3221 at least partially extends into and is fixed to the second receiving cavity 3213, such that rotation of the first eccentric portion 321 drives rotation of the second eccentric portion 322. The third shaft portion 3221 of the second eccentric portion 322 is mounted to the first eccentric portion 321 with the second central axis 103 as the central axis. The third end portion 3222 is formed with a working head mounting portion 3223 for connecting and assembling the working head 330. In this embodiment, the third end portion 3222 and the working head mounting portion 3223 are not accommodated in the first eccentric member 310, but the third shaft portion 3221 is accommodated in the first eccentric member 310. In some embodiments, the second eccentric member can be of two types, wherein the first type of the second eccentric member and the second type of the second eccentric member have different structures, but have the same mass and center of mass position.

[0057] The working head mounting portion 3223 is configured with an internal thread, and one end of the working head 330 is configured with an external thread. The internal and external threads mate to complete the installation of the working head 330. The other end of the working head 330 is used for direct connection with a working accessory, such as by adhesion. Thus, the rotation of the motor 200 drives the first eccentric member 310 to rotate, and the first eccentric part 321 rotates together with the first eccentric member 310. The first eccentric part 321 does not rotate relative to the first eccentric member 310, while the second eccentric part 322 rotates eccentrically relative to the first eccentric part 321. The working head 330 rotates eccentrically together with the second eccentric part 322, but does not rotate relative to the second eccentric part 322. The second eccentric member 320 can be mounted to the first eccentric member 310 and driven to rotate by the first eccentric member 310, at least in a first or second manner. The working head 330 can be at least a first working head or a second working head with different structures, and the first and second working heads have the same mass and center of gravity.

[0058] The following is combined with Figures 7 to 11 This describes two installation methods for the second eccentric member 320. The geometry formed by the boundary 3105 of the first receiving cavity 3104 is the same as the geometry formed by the outer contour of the second end 3212 of the second eccentric member 320, thereby allowing the first eccentric member 310 and the second eccentric member 320 to be installed together and rotate together. Figure 7 As shown, the geometry of the first receiving cavity 3104 allows the second eccentric member 320 to be assembled with it in two ways. In one mounting method (e.g.) Figure 10 As shown), the second eccentric component 320 can be arranged as follows: Figure 4 Installed into the first receiving cavity 3103 in the manner shown; in another installation method (such as...) Figure 11 As shown), the second eccentric component 320 can be rotated 180 degrees around the second central axis 103 and then installed into the first receiving cavity 3103.

[0059] The first eccentric member 310 forms the overall system counterweight 311 of the eccentric rotation device 300. In this embodiment, the overall system counterweight 311 includes a first counterweight 3111 and a second counterweight 3112, and the overall system counterweight 311 is heavier than the mass of the opposite side of the first eccentric member 310. The first eccentric part 321 of the second eccentric member 320 forms the subsystem counterweight 3215 of the eccentric rotation device 300. When the first eccentric member 310 and the second eccentric member 320 are assembled, the distance between the rotation axis input from the input end of the first eccentric member 310 and the rotation axis output from the output end of the second eccentric member 320 is the eccentricity. That is, the eccentricity is the distance between the second central axis 103 of the working head 330 and the motor axis 101 of the motor shaft 210. The eccentricity can be at least two types. When the second eccentric component 320 is installed on the first eccentric component 310 in a first manner, the working head 330 rotates with the first eccentricity; when the second eccentric component 320 is installed on the first eccentric component 310 in a second manner, the working head 330 rotates with the second eccentricity.

[0060] Figure 10 The first configuration is shown, in which the working head 330 is installed with an eccentricity of (L+e). The first eccentricity is the distance between the first central axis 102 and the second central axis 103 plus the distance between the motor axis 101 and the first central axis 102. In this configuration, the first eccentricity is (L+e). In this position, the overall system counterweight 311 and the subsystem counterweight 3215 are located on the same side of the second central axis 103, jointly balancing the vibration caused by the larger eccentricity. Figure 11 The second configuration is shown, in which the working head 330 is installed with a second eccentricity, which is the distance between the first central axis 102 and the second central axis 103 minus the distance e between the motor axis 101 and the first central axis 102, i.e., the magnitude of the second eccentricity is (Le). In this position, the main system counterweight 311 and the subsystem counterweight 3215 are located on different sides of the second central axis 103, and the two counterweights cancel each other out, thereby achieving better balance in the vibration of the entire machine. The first eccentricity is greater than the second eccentricity; this design allows the working head 330 of the surface treatment tool 10 to output eccentric motion with two eccentricities.

[0061] In the first method, the second eccentric member 320 differs from the first eccentric member 310 by a first phase; in the second method, the second eccentric member differs from the first eccentric member by a second phase. In this embodiment, the first phase and the second phase differ by 180 degrees. Under both the first and second installation methods, the position of the motor shaft 101 remains unchanged, the position of the first central axis 102 relative to the motor shaft 101 also remains unchanged, but the position of the second central axis 103 changes. In this embodiment, the motor shaft 101, the first central axis 102, and the second central axis 103 do not coincide. When the first phase and the second phase differ by 180 degrees, the difference between the first eccentricity and the second eccentricity is the largest.

[0062] In this embodiment, the first eccentric member 310, the second eccentric member 320, and the working head 330 form an assembly that rotates around the motor shaft 210, with a balance accuracy less than or equal to 630 mm / s, achieving a G630 level according to the balance grade function set by ISO-1940. The second eccentric member 320 and the working head 330 form an assembly that rotates around the first central axis 102, with a balance accuracy less than or equal to 630 mm / s, achieving a G630 level according to the balance grade function set by ISO-1940.

[0063] The product of the eccentricity and eccentric mass of the first eccentric member 310 relative to the motor shaft 210 is the first product, and the product of the eccentricity and eccentric mass of the entire assembly formed by the second eccentric member 320 and the working head 330 relative to the motor shaft 210 is the second product. The first product and the second product are substantially equal. In some embodiments, the ratio of the difference between the second product and the first product to the first product is less than or equal to 20%. In some embodiments, the ratio of the difference between the second product and the first product to the first product is less than or equal to 15%. In some embodiments, the ratio of the difference between the second product and the first product to the first product is less than or equal to 10%. In some embodiments, the ratio of the difference between the second product and the first product to the first product is less than or equal to 5%.

[0064] In one embodiment, the difference between the first eccentricity and the second eccentricity is approximately twice the distance between the first central axis 102 and the second central axis 103. The first eccentricity is approximately 5 mm, the second eccentricity is approximately 3 mm, and the first phase and the second phase differ by 180 degrees. Figure 3 As shown, the triangle on the second eccentric member 320 is aligned with the triangle on the first eccentric member 310 at the number "3". In this installation position, the eccentricity is 3mm. Figure 4 Assemble in the order shown. The triangle on the second eccentric part 320 is aligned with the triangle on the first eccentric part 310 at the number "5". In this installation position, the eccentricity is 5mm.

[0065] The surface treatment tool 10 also includes a quick-clamp device 400. The quick-clamp device 400 is used to quickly separate the first eccentric member 310 and the second eccentric member 320, facilitating the user's assembly and disassembly of the second eccentric member 320. The quick-clamp device 400 includes an operating member 410, a pressure plate 420, and a limiting member 430. The user adjusts the quick-clamp device 400 by operating the operating member 410. In this embodiment, the limiting member 430 is a limiting ball. The first shaft portion 3101 of the first eccentric member 310 has a through hole 3106, and the second shaft portion 3211 of the second eccentric member 320 has multiple mounting holes 3214. When the first eccentric member 310 and the second eccentric member 320 are engaged, the limiting member 430 passes through the through hole 3106 and sits on the mounting hole 3214. That is, the limiting member 430 locks the first eccentric member 310 and the second eccentric member 320 axially, preventing relative movement between them. A rotating shaft 421 is provided on the side of the pressure plate 420 opposite to the operating member 410, and the rotating shaft 421 is fixed by the housing 100. Two opposing protrusions 422 are also provided on the pressure plate 420. A pressure cover 440 and an elastic member 450 are provided on the side of the pressure plate 430 away from the limiting member 430. The elastic member 450 is disposed in a compressed state between the pressure cover 440 and the first bearing 460. When the pressure cover 440 moves rearward, the compression of the elastic member 450 increases, providing a restoring force for the pressure cover 440 to return to its original position. When the user moves the operating member 410 away from the first eccentric member 310, the portion of the pressure plate 420 other than the rotating shaft 421 rotates around the rotating shaft 421 until the protrusions 422 move to the rear of the limiting member 430, allowing the limiting member 430 to move in a direction perpendicular to the first centerline 102, thus releasing the locking of the first eccentric member 310 and the second eccentric member 320.

[0066] Figure 12 Another embodiment of the eccentric rotating device is shown, and only the parts that differ from the previous embodiment are described below. Figure 12 This can be understood as a schematic diagram obtained by projecting the eccentric rotating device 300a along the direction of the motor axis 101 onto a first plane perpendicular to the motor axis 101. In this embodiment, the geometry of the boundary 3105a of the first receiving cavity 3104 of the first eccentric member 310a is a regular hexagon. That is, the geometry of the outer contour of the second end 3212 of the second eccentric member 320 is also a regular hexagon. The first eccentric member 310a is provided with a total system counterweight 311a, and the second eccentric part of the second eccentric member 320a is provided with a subsystem counterweight 3215a. The projection point of the motor axis 101 onto the first plane is the first center point A, the projection point of the first center line 102 onto the first plane is the second center point B, and the projection point of the second center line 103 onto the first plane is the third center point C. The eccentricity is the distance between the motor axis 101 and the second center line 103, which is also the distance AC between the first center point A and the third center point C.

[0067] Figures 13a to 13f Six different mounting positions of the second eccentric member 320a are shown, forming four different eccentricities. For example... Figure 13a As shown, the main system counterweight 311a and the subsystem counterweight 3215a are located on the same side of the first center point A, and the eccentricity AC1 is the maximum eccentricity of the eccentric rotating device 300. Figure 13b As shown, the main system counterweight 311a and the subsystem counterweight 3215a are located on opposite sides of the first center point A, and the eccentricity AC2 is the minimum eccentricity distance of the eccentric rotating device 300. Figure 13c and Figure 13d In both cases, the eccentricity was AC3, resulting in the same eccentricity for both installation angles. Figure 13e and Figure 13f In the middle, the eccentricity is AC4.

[0068] Similarly, the boundary 3105 of the first receiving cavity 3104 can also be other shapes to form two or more different eccentricities. In other words, the assembly surfaces of the first eccentric member 310 and the second eccentric member 320 can be of various shapes, such as circles, ellipses, quadrilaterals, pentagons, hexagons, etc., to meet the requirements for the number of eccentricities.

[0069] 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 surface treatment tool, comprising: chassis; An electric motor is disposed within the housing, and the electric motor includes a stator, a rotor, and a motor shaft; An eccentric rotating device includes: The first eccentric component is coupled to the motor shaft and is driven to rotate by the motor shaft; A second eccentric member, capable of being mounted to the first eccentric member in at least a first or second manner and driven to rotate by the first eccentric member, the second eccentric member including a working head mounting portion; and The working head is installed into the working head mounting section; The characteristic feature is that when the second eccentric component is installed onto the first eccentric component in the first manner, the working head rotates with a first eccentric distance; when the second eccentric component is installed onto the first eccentric component in the second manner, the working head rotates with a second eccentric distance different from the first eccentric distance.

2. The surface treatment tool according to claim 1, characterized in that, The first eccentric component, the second eccentric component, and the working head form an assembly that rotates around the motor shaft, and the balance accuracy is less than or equal to 630 mm / s.

3. The surface treatment tool according to claim 1, characterized in that, The product of the eccentricity and eccentric mass of the first eccentric component relative to the motor shaft is the first product, and the product of the eccentricity and eccentric mass of the whole formed by the second eccentric component and the working head relative to the motor shaft is the second product. The first product and the second product are substantially equal.

4. The surface treatment tool according to claim 1, characterized in that, The product of the eccentricity and eccentricity of the first eccentric component relative to the motor shaft is the first product, and the product of the eccentricity and eccentricity of the whole formed by the second eccentric component and the working head relative to the motor shaft is the second product. The ratio of the first product to the second product is greater than or equal to 0.98 and less than or equal to 1.

02.

5. The surface treatment tool according to claim 1, characterized in that, The second eccentric member, excluding the working head mounting part, is housed within the first eccentric member.

6. The surface treatment tool according to claim 1, characterized in that, In the first method, the second eccentric component is out of phase with the first eccentric component; in the second method, the second eccentric component is out of phase with the first eccentric component.

7. The surface treatment tool according to claim 1, characterized in that, The second eccentric component and the working head form an integral structure that rotates around the first central axis, with a balance accuracy of less than or equal to 630 mm / s.

8. The surface treatment tool according to claim 1, characterized in that, Regardless of the installation method, the position of the first central axis relative to the motor shaft remains unchanged.

9. The surface treatment tool according to claim 1, characterized in that, The working head mounting part has a second central axis, which does not coincide with the first central axis.

10. The surface treatment tool according to claim 1, characterized in that, The difference between the first eccentricity and the second eccentricity is greatest when the first phase and the second phase are 180 degrees apart.

11. The surface treatment tool according to claim 1, characterized in that, The working head can be at least a first working head or a second working head with different structures, wherein the first working head and the second working head have the same mass and center of mass position.

12. The surface treatment tool according to claim 1, characterized in that, The second eccentric component can be of two types, wherein the first type of the second eccentric component and the second type of the second eccentric component have different structures, but have the same mass and center of mass position.

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