阅读说明：本技术 手持式动力工具 (Hand-held power tool ) 是由 吉绍山 梅杰 党亚洲 于 2020-04-03 设计创作，主要内容包括：一种手持工具,属于打磨工具领域,包括机身和工作底板,机身空心轴、第一连接件、马达以及输出组件；工作底板包括本体以及与本体连接且能够相对于本体旋转的输入组件,输入组件包括第二连接件,当第一、第二连接件配接时,工作底板与机身不可分离地连接,输入组件能够在输出组件作用下带动本体运动；机身还包括相对于机身的壳体的轴向固定的抵接件,第一连接件能够沿轴向在上方位置下方位置间运动,当位于上方位置,抵接件阻止所述第一连接件向远离工作底板的轴向运动。相对于现有技术,通过设置抵接件,整机工作时能够消除异响。另外,第一连接件由下方位置运动至上方位置的距离在1mm到2mm之间,工作底板预安装简单。(A hand tool belongs to the field of polishing tools and comprises a machine body, a working bottom plate, a machine body hollow shaft, a first connecting piece, a motor and an output assembly; the working bottom plate comprises a body and an input assembly which is connected with the body and can rotate relative to the body, the input assembly comprises a second connecting piece, when the first connecting piece and the second connecting piece are matched and connected, the working bottom plate is inseparably connected with the machine body, and the input assembly can drive the body to move under the action of the output assembly; the fuselage still includes the fixed butt piece of axial for the casing of fuselage, and first connecting piece can move between upper position below position along the axial, and when being located the top position, the butt piece prevents first connecting piece is to keeping away from the axial motion of work bottom plate. Compared with the prior art, the supporting part is arranged, so that abnormal sound can be eliminated when the whole machine works. In addition, the distance of the first connecting piece moving from the lower position to the upper position is between 1mm and 2mm, and the pre-installation of the working bottom plate is simple.)

1. A hand-held power tool comprising:

the device comprises a machine body, a motor and an output assembly, wherein the machine body comprises a shell, a hollow shaft which is rotatably arranged on the shell, and a first connecting piece which axially penetrates through the hollow shaft along the hollow shaft;

the working bottom plate is detachably connected to the machine body and comprises a body and an input assembly which is connected with the body and can rotate relative to the body, the input assembly comprises a second connecting piece which can be matched with the first connecting piece, when the first connecting piece and the second connecting piece are matched, the working bottom plate is connected with the machine body in an inseparable mode along the axial direction of the hollow shaft, and the input assembly can rotate around a first rotation axis under the driving of the output assembly to drive the body to move; the method is characterized in that: the fuselage still including connecting in the butt piece of casing, first connecting piece can follow the axial is in the top position with the butt piece butt and keep away from the below position of butt piece between the position, when first connecting piece was located the top position, the butt piece prevents first connecting piece is further to the axial motion of keeping away from the work bottom plate, just one end that first connecting piece is close to the work bottom plate is followed stretch out in the hollow shaft.

2. The hand-held power tool of claim 1, wherein the first connector is provided with a radially extending flange comprising an upper side facing away from the work floor and a lower side facing towards the work floor, the upper side abutting the abutment when the first connector is in the up position.

3. The hand-held power tool of claim 2, wherein the flange has an outer diameter greater than an outer diameter of the hollow shaft, the lower side abuts an upper end surface of the hollow shaft distal from the work floor to prevent the first connector from falling out of the hollow shaft when the first connector is in the down position, and an axial distance L1 from the upper side to the abutment is between 1mm and 2 mm.

4. The hand-held power tool of claim 2, wherein the axial distance L1 from the upper side to the abutment member is provided when the first connecting member is in the lower position, the first connecting member has an external thread at an end thereof adjacent to the working base plate, the second connecting member has a threaded hole with an internal thread, the engagement amount between the external thread and the internal thread is L2 when the working base plate and the body are coupled in place, and the engagement amount L2 is equal to or greater than the axial distance L1.

5. The hand-held power tool of claim 4, wherein the body includes a resilient swinging member disposed in the housing, and the body is provided with a stop member that mates with the resilient swinging member to limit rotational movement of the body about another axis parallel to the first axis of rotation when the work board is mounted to the body.

6. The hand-held power tool of claim 5, wherein the elastic swinging member comprises an interference elastic member capable of radially interference-fitting with a retaining member along the hollow shaft, when the working base plate and the machine body are coupled in place, the axial interference fit length of the retaining member and the interference elastic member is L3, and the sum of the axial distance L1 and the interference fit length L3 is less than or equal to the length of the engagement amount L2.

7. The hand-held power tool of claim 5, wherein the elastic swinging member comprises an interference elastic member capable of interference-fitting with the stopper along the radial direction of the hollow shaft, the stopper and the interference elastic member have an interference fit length L3 when the working baseplate and the machine body are fit-coupled in place, and the fit length L3 is between 3mm and 7 mm.

8. The hand-held power tool of claim 1, wherein the body further comprises an operating mechanism operable to rotate the first link, the first and second links mating to enable the work deck to be connected to the body when the first link is rotated in a first direction about the first axis of rotation relative to the second link by the operating mechanism; when the first connecting piece rotates around a second direction opposite to the first direction under the action of the operating mechanism, the first connecting piece can provide reaction force for the second connecting piece so as to enable the second connecting piece to move axially away from the first connecting piece, and therefore the working bottom plate is separated from the machine body.

9. The hand-held power tool of claim 8, wherein the operating mechanism includes an operating member and a base disposed on the housing, the operating member is pivotally connected to the base, when the operating member drives the first connecting member to rotate, the base can rotate together with the operating member relative to the housing, the abutting member is made of metal, and the abutting member is fixed to the base.

10. The hand-held power tool of claim 2, wherein when the work base is mounted to the body and mated in place, the first connector is in the down position, the underside of the flange abuts the end of the hollow shaft remote from the work base, and the first and second connectors and the hollow shaft are capable of synchronous rotation upon actuation of the motor.

Technical Field

The invention relates to a handheld electric grinding tool, in particular to a sanding machine.

Background

Chinese patent application publication No. CN109382735A discloses a sander, which comprises a machine body, a working bottom plate located below the machine body and connected with the machine body in a matching manner, the machine body comprises a hollow shaft driven by a motor to rotate and a first connecting piece movably located in the hollow shaft, a second connecting piece capable of rotating relative to the machine body and connected with the first connecting piece is arranged in the bottom plate, wherein the first connecting piece is a threaded rod at least near the second connecting piece, the second connecting piece comprises a threaded hole used for being connected with the threaded rod in a matching manner, in addition, one end of the threaded rod far away from the working bottom plate is provided with an elastic element, the elastic element is used for enabling one end of the first connecting piece near the working bottom plate to extend out of the hollow shaft, but when the whole machine works and generates vibration, the elastic element can shake in an accommodating space of the elastic element, so as to generate abnormal sound.

Disclosure of Invention

In view of the above, there is a need to provide a sander with better performance.

A hand-held power tool comprises a machine body, wherein the machine body comprises a shell, a hollow shaft which is rotatably arranged on the shell, and a first connecting piece which axially penetrates through the hollow shaft along the hollow shaft, and further comprises a motor and an output assembly which is driven by the motor to rotate; the working bottom plate is detachably connected to the machine body and comprises a body and an input assembly which is connected with the body and can rotate relative to the body, the input assembly comprises a second connecting piece which can be matched with the first connecting piece, when the first connecting piece and the second connecting piece are matched, the working bottom plate is connected with the machine body in an inseparable mode along the axial direction of the hollow shaft, and the input assembly can rotate around a first rotation axis under the driving of the output assembly to drive the body to move; the fuselage still including connecting in the butt piece of casing, first connecting piece can follow the axial is in the top position with the butt piece butt and keep away from the below position of butt piece between the position, when first connecting piece was located the top position, the butt piece prevents first connecting piece is further to the axial motion of keeping away from the work bottom plate, just one end that first connecting piece is close to the work bottom plate is followed stretch out in the hollow shaft.

Preferably, the first connecting member is provided with a radially extending flange, which flange comprises an upper side facing away from the work bottom plate and a lower side facing the work bottom plate, the upper side abutting the abutment member when the first connecting member is in the upper position.

Preferably, the outer diameter of the flange is larger than the outer diameter of the hollow shaft, when the first connecting piece is located at the lower position, the lower side surface is abutted with the upper end surface of the hollow shaft far away from the working bottom plate so as to prevent the first connecting piece from falling out of the hollow shaft, and the axial distance L1 from the upper side surface to the abutting piece is between 1mm and 2 mm.

Preferably, when the first connecting piece is located at the lower position, the axial distance L1 from the upper side surface to the abutting piece is provided, one end of the first connecting piece close to the working bottom plate is provided with an external thread, the second connecting piece comprises a threaded hole provided with an internal thread, when the working bottom plate and the machine body are matched and connected in place, the engagement amount between the external thread and the internal thread is L2, the engagement amount L2 is greater than or equal to the axial distance L1, and the length of the engagement amount L2 is between 5mm and 8 mm.

Preferably, the machine body includes an elastic swinging member disposed on the housing, the body is provided with a limiting member, and when the operating floor is mounted to the machine body, the limiting member is coupled to the elastic swinging member to limit the body to perform a rotational motion around another axis parallel to the first rotational axis.

Preferably, the elastic swinging piece comprises an interference elastic piece capable of being in interference fit with the limiting piece along the radial direction of the hollow shaft, when the operating baseplate is matched with the machine body in place, the axial interference fit length of the limiting piece and the interference elastic piece is L3, and the sum of the axial distance L1 and the interference fit length L3 is less than or equal to the length of the engagement amount L2.

Preferably, the elastic swinging piece comprises an interference elastic piece capable of being in interference fit with the limiting piece along the radial direction of the hollow shaft, when the operating bottom plate is matched with the machine body in place, the interference fit length of the limiting piece and the interference elastic piece is L3, and the fit length L3 is between 3mm and 7 mm.

Preferably, the machine body further comprises an operating mechanism, the operating mechanism is operable to drive the first connecting piece to rotate, and when the first connecting piece rotates around the first rotation axis relative to the second connecting piece along the first direction under the action of the operating mechanism, the first connecting piece and the second connecting piece are matched and connected, so that the working bottom plate can be connected with the machine body; when the first connecting piece rotates around a second direction opposite to the first direction under the action of the operating mechanism, the first connecting piece can provide reaction force for the second connecting piece so as to enable the second connecting piece to move axially away from the first connecting piece, and therefore the working bottom plate is separated from the machine body.

Preferably, operating device includes operating parts and sets up in the base of casing, the operating parts pin joint in the base, when operating parts drive first connecting piece rotatory, the base can rotate for the casing along with the operating parts together, the butt piece is the metal material, just the butt piece is fixed in the base.

Preferably, when the work bottom plate is installed to the fuselage and is joined in place in the adapted mode, first connecting piece is located the below position, the downside of flange with the hollow shaft is kept away from the terminal surface butt of work bottom plate, and first, second connecting piece and hollow shaft can be under the drive of motor synchronous revolution.

The invention also provides a method for disassembling the working bottom plate of the hand-held power tool, wherein the machine body comprises an elastic swinging piece arranged on the shell, the body is provided with a limiting piece, the elastic swinging piece comprises an interference section which can be in interference fit with the limiting piece along the radial direction, when the working bottom plate is installed on the machine body, the limiting piece can limit the body to rotate around other axes parallel to the first rotation axis, the machine body also comprises an operating mechanism, the operating mechanism can operatively drive the first connecting piece to rotate, when the first connecting piece is positioned at the upper position and rotates around the second direction relative to the second connecting piece under the action of the operating mechanism, the first connecting piece can provide reaction force for the second connecting piece so as to enable the second connecting piece to move towards the axial direction far away from the first connecting piece, and therefore the working bottom plate can be separated from the machine body; the method for disassembling the bottom plate of the hand-held power tool comprises the following steps:

s1: operating the operating mechanism to rotate the first connecting piece relative to the second connecting piece around a second direction, wherein the first connecting piece moves to an upper position along the axial direction in a direction away from the working bottom plate;

s2: when the first connecting piece is in an upper position and is abutted against the abutting piece, the second connecting piece moves in the direction far away from the first connecting piece along the axial direction under the action of the first connecting piece, and the limiting piece is axially separated from the interference section;

s3: the second connecting piece is separated from the first connecting piece, so that the working bottom plate can be separated from the machine body.

Drawings

FIG. 1 is a partial cross-sectional view of a sander body separated from a work substrate in accordance with one embodiment of the present invention;

fig. 2 is a perspective view of the sander with the body separated from the work plate in accordance with an embodiment of the present invention;

FIG. 3 is a perspective view of a body with a work board mounted thereon with one of the cabinets open, according to one embodiment of the present invention;

FIG. 4 is a perspective view of a middle worktop according to one embodiment of the invention;

FIG. 5 is a cross-sectional view of the work head plate mated with the body, with the operator in a closed position;

FIG. 6 is a cross-sectional view of the work deck mated with the fuselage with the operator compartment in an open position;

FIG. 7 is an enlarged view of a portion A of FIG. 1;

FIG. 8 is a schematic perspective view of a locking mechanism according to an embodiment of the present invention;

FIG. 9 is a perspective view of the operating mechanism with the operating member in a closed position;

FIG. 10 is a perspective view of the operating mechanism with the operating member in an open position;

FIG. 11 is a perspective view of a first connecting member according to an embodiment of the present invention;

FIG. 12 is a perspective view of a limiting mechanism according to an embodiment of the present invention;

FIG. 13 illustrates an embodiment of a limit member coupled to a limit mechanism;

fig. 14 is a partial enlarged view of fig. 13 at B.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the specification, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a specific structure, feature, or the like described in the embodiment is included in at least one embodiment of the invention. Various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Referring to fig. 1, an embodiment of the present invention provides a hand-held power tool, and is specifically described with reference to a sander 100 as an example. The sander 100 includes a body 10 and a work base 20, wherein the work base 20 is detachably connected to the body 10, so that the body 10 can be assembled with work bases 20 of different shapes according to different work requirements. The airframe 10 includes a housing 110, a motor 120 located within the housing 110, an output assembly 30 (see fig. 3) driven in rotation by the motor 120, a first connector 40, and a hollow axle 50 rotatable about a first axis of rotation X1. The motor 120 includes a motor shaft 121, and the first rotation axis X1 is disposed parallel to an axis of the motor shaft 121. The first connecting element 40 extends through the hollow shaft 50 in the axial direction of the first axis of rotation X1. The sander 100 further includes an operating mechanism 60 (see fig. 3) disposed on the housing 110, and the operating mechanism 60 includes an operating member 61, and the operating member 61 is capable of switching between at least an initial state and an operating state capable of rotating the first connecting member 40.

With continued reference to fig. 1, the work deck 20 includes a body 201, and an input assembly 21 connected to the body 201 and rotatable relative to the body 201 about a second axis of rotation. The input assembly 21 includes a second connecting member 211 capable of being coupled with the first connecting member 40, and the input assembly 21 is at least partially disposed axially as an eccentric shaft segment 210, wherein a central axis of the eccentric shaft segment 210 is disposed eccentrically (i.e., an eccentric amount e exists therebetween) with respect to the second rotation axis, and the body 201 is connected with the eccentric shaft segment 210 through a bearing 22. When the work bottom plate 20 is connected to the first connecting member 40 of the fuselage 10 via the second connecting member 211 (i.e. when the work bottom plate 20 is inseparably connected to the fuselage 10 along the axial direction of the hollow shaft 50), the input assembly 21 is driven by the motor 120 to rotate about the first rotation axis X1, and the eccentric shaft segment 210 drives the work bottom plate 20 to work via the bearing 22.

Referring to fig. 2 to 4, preferably, in the present embodiment, the output assembly 30 includes a first transmission wheel 31, a second transmission wheel 32 engaged with the first transmission wheel 31 and driven to rotate by the first transmission wheel 31, and a torque output portion 33 driven to rotate by the second transmission wheel 32. In this embodiment, the first transmission wheel 31 is preferably disposed on the motor shaft 121 and located at one end of the motor 120 close to the working base plate 20, the second transmission wheel 32 and the torque output portion 33 are fixedly disposed on the outer periphery of the hollow shaft 50, the input assembly 21 is further provided with a torque input portion 212 coupled with the torque output portion 33, preferably, the torque input portion 212 and the torque output portion 33 include a crown tooth 331, preferably, the crown tooth 331 extends in the axial direction, so that the output assembly 30 can transmit the rotation power of the motor 120 to the input assembly 21 through the crown tooth 331 to drive the body 201 to be ground through the output assembly 21.

Referring to fig. 1-3, in order to ensure the stability of the transmission, in the present embodiment, the transmission between the first transmission wheel 31 and the second transmission wheel 32 is performed through a transmission belt (not shown). The sander 100 further includes a first fan 70 located at the lower end of the second transmission wheel 32 and located above the work base plate 20, the first fan 70 has a first side 701 away from the work base plate 20 and a second side 702 facing the work base plate, the first side 701 is provided with a first fan blade for cooling the first belt wheel 31, the second belt wheel 32 and the transmission belt, and the second side 702 is provided with a second fan blade for flowing back the sanding dust of the work base plate 20, so that the sanding dust can flow into a dust collecting box (not shown). It should be noted that the upper and lower orientation described in the present embodiment represents a relative positional relationship between components, not an orientation relationship at a specific viewing angle, in which the body 10 is located at an upper position with respect to the work base 20, and the direction indicated by the arrow Y is upward in the plan orientation shown in fig. 5. Referring to fig. 1, 6-7 and 11, in this embodiment, the first connecting member 40 and the second connecting member 211 are connected by a screw thread, the first connecting member 40 is a threaded rod having an external thread 400 at least near one end of the working base plate 20, the second connecting member 211 includes a threaded hole 2110 at least a portion of the inner wall of which is provided with an internal thread, and the second connecting member 211 further includes a mating portion 2111 located at the upper end of the threaded hole 2110 and having an outer diameter larger than the outer diameter of the threaded hole. The outer diameter of the mating portion 2111 is substantially the same as the outer diameter of the hollow shaft 50. Referring to fig. 5, when the work deck 20 is mounted to the airframe 10, the hollow shaft 50 extends into the mating portion 2111 to enhance the stability of the mating between the work deck 20 and the airframe 10. The outer circumference of the first connecting piece 40 is provided with a radially outwardly projecting flange 41, which flange 41 has a lower side 411 facing the work floor and an upper side 412 facing away from the work floor. In order to prevent the first connecting piece 40 from falling out of the hollow shaft 50 in the axial direction of the first axis of rotation toward the direction close to the work base 20, the diameter of the first flange 41 is larger than the outer diameter of the hollow shaft 50. The sander 100 further includes an abutment 80 fixed relative to the housing 110 in the axial direction of the first rotation axis X1, and the second flank 412 is capable of abutting the abutment 80 in the axial direction of the first rotation axis X1 to prevent the first connector 40 from moving further from within the hollow shaft 50 in the axial direction of the first rotation axis in a direction away from the work floor 20.

Referring to fig. 3 and 6, the first connecting member 40 is rotated relative to the second connecting member 211 by the rotating operation member 61 in the present embodiment, so that the work base plate 20 is connected to or separated from the machine body 10. As will be appreciated, because the first and second attachment members 40, 211 are threadably engaged, to prevent the second attachment member 211 from rotating with the first attachment member 40, the sander also includes a locking mechanism 90 that is capable of locking the second attachment member 211 (i.e., the input assembly 21) relative to the housing 110, the locking mechanism 90 having a locked state and an unlocked state, the locking mechanism 90 being capable of rotationally fixing the input assembly 21 relative to the housing 110 when in the locked state. Preferably, the locking mechanism 90 includes a first locking member 91 fixed to the outer periphery of the hollow shaft 50, a second locking member 92 disposed non-rotatably with respect to the housing 110, and an elastic member 93 having one end abutting against the housing 110 and the other end abutting against the second locking member 92.

Referring to fig. 1, 3 and 5, when the operating mechanism 60 is in the initial state, that is, the operating member 61 is in the closed state (the outer contour of the operating member 61 is substantially within the range of the outer contour of the housing 201 of the body 10), the operating member 61 compresses the elastic member 93 through the second locking member 92, and the second locking member 92 is separated from the first locking member 91, so that the hollow shaft 50 can rotate relative to the housing 201. When the operating mechanism 60 is in the operating state, that is, the operating member 61 is in the open state (the outer contour line of the operating member 61 is located outside the range of the outer contour line of the housing 201 of the body 10), at this time, the operating member 61 no longer abuts against the second locking member 92, the elastic element 93 elastically returns and pushes the second locking member 92 to move so that the second locking member 92 is coupled with the first locking member 91, and the hollow shaft 50 is locked with respect to the housing 201, that is, the hollow shaft 50 cannot rotate with respect to the housing 201. In this embodiment, specifically, the elastic element 93 performs an elastic movement along the axial direction of the hollow shaft 50, and when the elastic element 93 elastically returns, the elastic element 93 drives the second locking member 92 to perform an axial movement so as to enable the second locking member 92 to be coupled with the first locking member 91, it can be understood that in other embodiments, the elastic element 93 may be configured in other manners.

Since torque output 33 is non-rotatably fixed to hollow shaft 50 and torque output 33 is connected in the rotational direction with torque input 212 of input assembly 21, when hollow shaft 50 is locked relative to housing 110 by locking mechanism 90, input assembly 21 is also locked in the rotational direction relative to housing 110. At this time, if the operating element 61 is operated and the first connecting element 40 is driven to rotate in a first direction (forward direction) according to an arrow t below the orientation shown in fig. 6 (where the Y axis in the coordinate is parallel to the axis of the output shaft), the first connecting element 40 can rotate relative to the second connecting element 211, so that the first and second connecting elements 40 and 211 are connected with the working base plate 20 and the machine body 10 through threaded connection; when the first and second connecting members 40, 211 are connected and the operating member 61 is rotated to drive the first connecting member 40 to rotate relative to the second connecting member 211 along a second direction (opposite to the first direction), the first and second connecting members 40, 211 are disconnected from the screw thread connection, and the operating base plate 20 can be separated from the machine body 10. It should be noted that the forward rotation and the reverse rotation shown in the present embodiment are only for schematically illustrating that the rotation direction of the first connecting member 40 is just opposite when the work base plate 20 is installed and removed, and therefore, the rotation direction is not to be construed as a specific limitation of the rotation direction at a specific viewing angle. In addition, it should be noted that the first rotation axis and the second rotation axis are coaxial when the work board 20 is mounted to the body.

How the operating mechanism 60 is switched between the initial state and the operating state and how the lock mechanism 90 is switched between the locked state and the unlocked state by the operating mechanism 60 will be described in detail below with reference to the drawings. Referring to fig. 6-9, in the present embodiment, the operating member 61 rotates the first connecting member 40. The operating mechanism 60 includes a base 62 rotatably disposed on the housing 110, and the operating member 61 is pivotally connected to the base 62 by a pin (not shown), so that the operating member 61 can be switched between an operating state or an open state (see fig. 8) and an initial state or a closed state (see fig. 7) relative to the base 62 (the housing 201). Preferably, the base 62 includes a base 620 extending in a horizontal direction and a pair of side ears 621 disposed symmetrically and perpendicular to the base, and the operating element 61 is provided with a pair of pivoting plates 611 coupled with the side ears 621. In this embodiment, in order to better pivot the operating element 61 relative to the base 62, the pivoting plate 611 and the side ears are connected by two pins at two sides of the central symmetry axis, specifically, taking one side of the central symmetry axis as an example, the pivoting plate 611 is fixedly provided with a first pin 1901, the side ears 621 are provided with a first waist-shaped hole 1912 coupled with the first pin 1901, meanwhile, the side ears 621 of the side are fixedly provided with a second pin 1902, and the pivoting plate of the side is provided with a second waist-shaped hole 1913. When the operating member 61 is switched between the initial state and the operating state, the first pin 1901 moves within the first kidney-shaped hole while the second pin 1902 moves within the second kidney-shaped hole. In order to enable the operating member to drive the first connecting member 40 to rotate when the operating member is in the operating state, the operating member 61 is provided with a first lug 1903, and the first connecting member 40 is provided with a second lug 413 which can be matched with the first lug 1903. In the present embodiment, it is preferable that the first connecting member 40 axially extends upward through the base plate 620, and when the operating member 61 is rotated from the state shown in fig. 9 to the state shown in fig. 10 according to the arrow R shown in fig. 9, the first lug 1903 is mated with the second lug 413. The abutting member 80 is fixed to the base, and the abutting member 80 is made of metal, preferably, the abutting member 80 is a metal collar embedded in the inner periphery of the base 62 and is simultaneously sleeved on the outer periphery of the first connecting member 40.

As can be seen from the above description, the work base 20 is detachably mounted to the body 10 by the mating or non-mating of the second connector 21 provided to the base with the first connector 40 provided to the body 10. Thus, the fuselage 10 can be fitted with different types of work floors 20, such as round sand floors (see fig. 2) and plate sand floors (see the third sand floor of fig. 4), which of course not only include the shape shown in fig. 4, but also quarter sand floors (not shown in the figures) and the like. Alternatively, the work surface 20 may comprise other types of work surfaces such as a triangular sanding surface (the sanding surface is approximately triangular and not shown), and will not be described further herein. It should be noted that, as can be seen from the above description, since the body 201 is coupled to the eccentric shaft section 210 through the bearing, in order to prevent the eccentric shaft section 210 from driving the body 201 to rotate around the first rotation axis through the bearing when the sander 100 is in operation, the fillet of the body 201 may injure an operator, and the sanding tool further includes the limiting mechanism 117.

Referring to fig. 2, 3 and 12, the limiting mechanism 117 includes elastic swinging members 1171 arranged in central symmetry and a limiting base plate 1170 connecting a plurality of the elastic swinging members 1171, in this embodiment, each elastic swinging member 1171 includes a plurality of flexible columns, preferably, the number of the flexible columns is even, and more preferably, the number of the flexible columns is 4 or 6. In this embodiment, the limiting mechanism 117 is located on the machine body 10, so that it is not necessary to separately provide a limiting structure for each plate sand or other work bottom plate that needs to limit its rotation. The upper end of the elastic swinging member 1171 is detachably fixed to the housing 110, so that the elastic swinging member 1171 can be replaced after being damaged due to long-term deformation under stress. Preferably, the upper end of the elastic swinging member 1171 is connected to the housing 110 by a screw so that the elastic swinging member 1171 can be stably fixed to the housing 110 without being easily automatically detached from the housing 110. Referring to fig. 2 and 12, since the upper end of the limiting mechanism 117 is covered by the housing 110, that is, the upper end of the limiting leg 1171 is not exposed outside the housing 110, and the lower end of the limiting mechanism 117 is blocked by the limiting substrate 1170, tools such as a screwdriver cannot extend into the housing 110, so that the installation of the limiting mechanism 117 is difficult. In this embodiment, the flexible columns of each elastic oscillating member 1171 are surrounded by a hollow through hole 1173, and the through hole penetrates through the limiting substrate 1170, so that an operator can screw a screw into the through hole from the lower side of the substrate 1170, in other words, the substrate 1170 is provided with a slot (not shown) corresponding to the through hole surrounded by the flexible columns. The operation bottom plate 20 is provided with a limiting member 2012 (see fig. 4) coupled to the elastic swinging member 1171, and preferably, the elastic swinging member 1171 further includes an elastic element 900 located between the through hole 1173 and the limiting member 2012, and the elastic element 900 is disposed at an end of the hollow through hole close to the limiting base plate 1170. The elastic element 900 comprises a first elastic part 901 positioned between the body 201 and the opening of the limiting hole 1203, and the first elastic part 901 is used for isolating the vibration caused to the body 201 when the limiting mechanism 117 vibrates along the up-down direction; the elastic element 900 further includes a second elastic element 902 located between the stopper 2012 and the sidewall of the through hole 1173 to isolate the stopper 2012 and the through hole 1173 from vibration in the radial direction.

Referring to fig. 5, when the work base plate 20 is mounted to the body 10 and coupled in place, it should be noted that "coupled in place" refers to a situation where the operating member 61 rotates the first connecting member 40 relative to the second connecting member 21 so that the external threads of the first connecting member 40 are completely engaged with the internal threads of the second connecting member 21. The mating of the work deck 20 to the fuselage 10 will be described with reference to the specific embodiment. Referring to fig. 1, when it is required to mount the work floor 20 to the machine body 10, one end (i.e. the end with the external thread) of the first connecting member 40 close to the work floor 20 is inserted into the threaded hole, and under the abutting action of the threaded hole, the first connecting member 40 moves axially away from the work floor 20, the upper side 412 abuts against the abutting member 80 above the upper side, the first connecting member 40 is located at the first position (upper position), the operating member 61 is operated to rotate the first connecting member 40 relative to the second connecting member 21, the first connecting member 41 moves axially towards the work floor 20, the work floor 20 moves axially towards the first connecting member 41 (axially upwards), and when the operating member 61 rotates to a position where the first connecting member 41 cannot be further rotated relative to the second connecting member 21, the lower side 411 abuts against the end face of the hollow shaft 50 away from the work floor, the first connecting member 41 is located at the second position (lower position) in the axial direction, and the second connecting member 21 cannot move further upward in the axial direction (e.g., the upper end surface of the torque output portion 33 abuts against the torque input portion 212 or other portions of the output assembly 30), and the work base plate 20 and the machine body 10 are coupled in place. At this time, after the motor 120 is started, the first connecting member and the second connecting member are driven by the motor 120 to synchronously rotate at this time.

As shown in fig. 13-14, the elastic element 900 of the elastic oscillating piece 1171 comprises a chamfered section 903 at its end close to the work bottom plate and an interference section 904 able to radially interfere with the stop 2012. It will be understood that, when the work board is installed, when the work board 20 is pre-installed to the machine body 10, that is, before the operation member 61 rotates the first connection member 41, the second connection member 21 is moved upward in the axial direction of the output shaft by the operator, so that the lower end of the first connection member 41 is inserted into the threaded hole of the second connection member 21, and then the first connection member 41 is moved upward in the axial direction by the abutment of the second connection member 21, so that the upper side surface 412 abuts against the abutment member 80. If the limiting member is inserted into the interference section 904 before the upper side 412 of the first connecting member 41 abuts against the abutting member 80 above the first connecting member, the pre-installation is difficult due to the interaction force F between the limiting member and the interference section 904 (i.e. the mating portion) of the elastic swinging member 1171. In the present embodiment, when the first connecting member 41 is located at the second position (lower position), the axial distance L1 from the second side surface 412 (upper side surface) to the abutting member 80 is between 1mm and 2 mm. Before the operating element is not rotated, when the first connecting element 41 abuts against the second connecting element and the second side surface 412 abuts against the abutting element 80, one end of the first connecting element 41 close to the operating base plate extends out of the hollow shaft, and the limiting element 2012 is located in the chamfered section 903 at this time. When the operating element is rotated in the first direction to drive the first connecting element 41 to rotate relative to the second connecting element, the second connecting element 21 drives the operating base plate 20 to move axially upward under the action of the first connecting element 41, so that the limiting element enters the interference section 904 and moves axially upward in the interference section 904. When the working base plate and the machine body are matched and connected in place, the engagement amount (namely the engagement length in the axial direction) of the external threads of the first connecting piece 41 and the internal threads in the threaded hole is L2, preferably, the length of L2 is greater than that of L1, and the length of the engagement amount L2 is between 5mm and 8 mm. More preferably, an interaction force F exists between the limiting member 2012 and the elastic swinging member 1171 at the coupling part (i.e. the coupling of the limiting member and the interference segment), and the interaction force F of the limiting member 2012 and the elastic swinging member 1171 is larger as the coupling length L3 along the axial direction is larger, and the coupling length L3 is between 3mm and 7 mm.

It should be noted that, in the embodiment, the torque input portion 212 and the torque output portion 33 are both crown-shaped teeth extending along the axial direction, and when the work base plate 20 is pre-installed, in order to ensure the rapidness and convenience of pre-installation, when the work base plate 20 approaches the machine body along the axial direction, the lower end of the first connecting member 40 first extends into the mating portion 2111, then the end of the hollow shaft 50 near the work base plate 20 also extends into the mating portion 2111, then the crown-shaped teeth of the torque input portion 212 and the torque output portion 33 are engaged in the axial direction, and finally, the limiting member is inserted into the chamfered section of the elastic swinging member. Of course, it will be appreciated that the meshing of the crown teeth of the torque input 212 and torque output 33 in the axial direction may also occur before the hollow shaft 50 extends into the mating portion 2111. Of course, in other embodiments, the limiting member may also move upward to the interference section during pre-installation.

The disassembling process of the work base 20 will be described in detail with reference to the accompanying drawings. Referring to fig. 6, when the operating member 61 is operated and the first connecting member 40 is rotated in the second direction, the first connecting member 40 moves in a direction axially away from the operating floor 20, when the upper side surface 412 abuts against the abutting member 80, the first connecting member 40 reacts to the second connecting member 21, the second connecting member 21 moves in a direction axially away from the first connecting member 40, so that the retaining member 2012 is withdrawn from the interference section 904, and when the threaded engagement between the first connecting member 40 and the second connecting member 21 is also completely disengaged, the operating floor 20 is separated from the body. It should be noted that, during the process of detaching the working base plate 20, the moving sequence of the first connecting element 40 and the second connecting element 21 may also be in other forms, for example, when the operating element 61 is operated and the first connecting element 40 is driven to rotate in the second direction, the first connecting element 40 moves in the direction axially away from the working base plate 20, before the upper side surface 412 abuts against the abutting element 80, the first connecting element 40 reacts to the second connecting element 21, and the second connecting element 21 moves in the direction axially away from the first connecting element 40, so that the limiting element 2012 is withdrawn from the interference section 904.

In order to make the retaining member 2012 withdraw from the interference portion 904 during the process of disassembling the operating floor 20, and to separate the operating floor 20 from the machine body after the threaded engagement between the first connecting member 40 and the second connecting member 21 is completely disengaged, the sum of the length of the axial distance L1 and the coupling length L3 is less than or equal to the length of the engagement amount L2. It will be appreciated that during the removal of the work base 20, the retaining member 2012 has been withdrawn from the interference portion 904 before the threaded engagement between the first and second coupling members 40, 21 is fully disengaged, so that the removal of the work base 20 from the body 10 can be achieved by operating the operating member 61.

Compared with the prior art, in the invention, because the axial distance L1 from the upper side surface to the abutting part is between 1mm and 2mm when the first connecting piece is positioned at the lower position, when the working bottom plate is installed, the operator can complete pre-installation after pre-installing the working bottom plate to the machine body upwards by a short distance, the pre-installation is simple, and particularly, when the working bottom plate is provided with a limiting piece, because the limiting piece and the elastic swinging piece are difficult to insert and connect between interference sections, the distance of LI is short, so that the installation process is easy when the working bottom plate is pre-installed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.