CN110944794B - Sanding tool and main body part and sanding part thereof - Google Patents

Abstract

An abrading tool comprising: a main body part (11), wherein the main body part (11) comprises a shell (110), a motor (112) and an output assembly (113) driven by the motor (112) to rotate; and a sharpening portion (12), the sharpening portion (12) being detachably connected to the main body portion (11), the sharpening portion (12) comprising a body (120) and an input assembly (121) rotating relative to the body (120); the main body part (11) further comprises a first connecting piece (114), the input assembly (121) comprises a second connecting piece (122), the first connecting piece (114) can move relative to the second connecting piece (122) to enable the first connecting piece and the second connecting piece to be connected in a matching mode, and therefore the output assembly (113) can drive the input assembly (121) to drive the body (120) to move. The grinding tool is simple in structure and convenient to operate. A main body portion of an abrading tool and an abrading portion of an abrading tool are also disclosed.

Description

Sanding tool and main body part and sanding part thereof

Technical Field

The invention relates to a hand-held power tool, in particular to a sander with a base plate replacing structure.

Background

Existing sanders include circular sanders, flat sanders, and the like, in which an output shaft of the circular sander drives a sanding sole plate to perform circular sanding, i.e., orbital motion of revolution and rotation, for grinding a relatively large amount of material, such as for rough grinding. The grinding shoe of the plate sand is restricted from rotating, so that the grinding shoe oscillates and is suitable for grinding small amounts of material, for example for fine machining or finishing.

When the grinding bottom plate swings, different bottom plate shapes can adapt to different operation working conditions. The plate sand bottom plate like a rectangle can be used for polishing under the conventional operation condition; the triangular plate sand bottom plate is obviously more advantageous when the working surface of the corner area is polished; and the special-shaped bottom plate with a finger shape is more suitable for polishing a narrow working surface in a region.

The sander capable of adapting to various operating conditions brings convenience to users, so that the sander is widely favored in the market. Various operating conditions herein may include finish and rough grinding operating conditions, or different shoe shapes may be used to meet different grinding zone operating conditions. The sander capable of adapting to various operating conditions becomes a multifunctional sander.

In a multifunction sander, it is common to replace the sole plate in order to achieve multiple functions. When the circular sand bottom plate is installed with the sander mainframe, the bottom plate does orbital motion of revolution and rotation without the limitation of swinging feet; when the plate sand bottom plate is installed with the sander main machine, the bottom plate does orbital motion only in revolution motion under the limitation of the swinging foot. The base plates with different shapes can naturally enable the multifunctional sander to meet the operating conditions of different polishing areas through the base plate replacing structure.

Chinese patent application CN103506923A and US8821220B2 disclose a floor changing structure. The base plate includes a base plate body for mounting sandpaper and an input assembly located within the base plate body and driven by a motor and capable of rotating relative to the base plate body. The bottom plate and the main body are axially locked along the motor shaft through a connecting mechanism, the connecting mechanism comprises a special-shaped locking steel wire positioned on the main body and a clamping groove positioned on the bottom plate and corresponding to the special-shaped locking steel wire, and the main body and the bottom plate are realized through a torque transmission mechanism because the locking steel wire and the clamping groove of the connecting mechanism are irrotational. However, the bottom plate body and the input assembly move during operation, so the bottom plate also needs to comprise a fixed base body for arranging the clamping groove, therefore, in the bottom plate, besides a bearing needs to be arranged between the bottom plate body and the input assembly, a bearing also needs to be arranged between the base body and the input assembly so that the input assembly can move relative to the base body, and the structure of the bottom plate is changed, so that the structure of the bottom plate is complex and the cost is high.

Based on the current state of the art, there is a need for an improved base plate replacement structure for a multifunction sander to overcome the problems of the prior art.

Disclosure of Invention

The invention provides a polishing tool with a simple and convenient bottom plate replacement structure.

The invention provides a technical scheme that: an abrading tool comprising: the main body part comprises a shell, a motor arranged in the shell and an output assembly driven by the motor to rotate; and a sharpening portion detachably connected to the main body portion, the sharpening portion comprising a body and an input assembly that rotates relative to the body about a first axis of rotation; the main body part further comprises a first connecting piece movably arranged relative to the shell, the input assembly comprises a second connecting piece and an eccentric element eccentrically arranged relative to the first rotating axis, the body is connected with the eccentric element, and the first connecting piece can move relative to the second connecting piece in an operable mode so that the first connecting piece and the second connecting piece are matched and connected, and therefore the output assembly can drive the input assembly to rotate around the first rotating axis to drive the body to move.

Preferably, when the first connecting piece and the second connecting piece are matched, the polishing part is not separated from the main body part along the axial direction.

Preferably, the sanding tool further comprises a locking mechanism configured to secure the second connector relative to the housing.

Preferably, the locking mechanism comprises a first locking member capable of moving between a locking position and a releasing position relative to the housing and a second locking member arranged to be non-rotatable relative to the second connecting member, the first locking member and the second locking member are coupled when the locking mechanism is located at the locking position, and the second connecting member is fixed relative to the housing; when the locking mechanism is located at the releasing position, the first locking piece and the second locking piece are separated from each other, and the second connecting piece can rotate relative to the shell.

Preferably, the first locking element is located on the main body portion and the second locking element is located on the sanding portion.

Preferably, the first connecting member includes a first supporting portion, and the second connecting member includes a second supporting portion for coupling with the first supporting portion.

Preferably, a hollow shaft is arranged on the outer side of the first connecting piece, the hollow shaft is fixedly arranged relative to the output assembly, a first supporting portion is arranged at one end, close to the polishing portion, of the hollow shaft, and the second connecting piece comprises a second supporting portion which is used for being matched and connected with the first supporting portion.

Preferably, the second supporting part is provided as a groove, and the outer diameter of the first supporting part matches the inner diameter of the groove.

Preferably, the central axis of the first support portion is disposed in line with the first rotation axis.

Preferably, a first mating portion is disposed on the first connecting piece, and the second connecting piece includes a second mating portion for mating with the first mating portion.

Preferably, the first mating portion is provided with an external thread, the second mating portion is provided with a mounting hole, and an internal thread matched with the external thread is arranged in the mounting hole.

Preferably, a center axis of the first fitting portion is disposed in line with the first rotation axis.

Preferably, the output assembly includes an output portion, the input assembly includes an input portion to mate with the output portion, the output portion mates with the input portion to transfer rotational motion of the motor to the input assembly when the first and second connectors are mated.

Preferably, the input part comprises a plurality of second ratchet teeth distributed around the circumference, and the output part comprises a plurality of first ratchet teeth in meshing transmission with the second ratchet teeth.

Preferably, the axis of rotation of the first connection member is arranged co-linearly with the first axis of rotation.

Preferably, the main body portion includes an elastic swing leg fixedly disposed relative to the housing, and the polishing portion is provided with a limit leg coupled to the elastic swing leg.

Preferably, the output assembly comprises a first drive wheel driven by the motor and a second drive wheel driven by the first drive wheel, and the axis of rotation of the first drive wheel is parallel to and spaced from the axis of rotation of the second drive wheel.

Preferably, the grinding tool further comprises a second fan fixedly arranged opposite to the second driving wheel, and a first fan coaxially arranged with the motor and located at one end of the motor close to the grinding part.

Preferably, the housing is provided with at least one air inlet and at least one air outlet, the air inlet is located at one end of the motor far away from the polishing portion, the air outlet is located close to the second fan, and external air flows enter the housing from the air inlet under the action of the first fan, then flow through the motor, and flow out from the second air outlet under the action of the second fan.

By adopting the technical scheme, the polishing part has a simple structure, and the polishing part and the main body part are convenient to disassemble and assemble.

The invention also provides a main body part which is convenient for dismounting the polishing part.

The invention provides a technical scheme that: an abrasive tool body portion for connection with an abrasive portion of a detachable abrasive tool, the body portion comprising: a housing; the motor is accommodated in the shell and used for providing rotary power; an output assembly rotatable relative to the housing under drive of the motor; the main body part further comprises a first connecting piece movably arranged on the shell, and the first connecting piece is used for being matched and connected with the grinding part and can rotate relative to the shell under the driving of the output assembly.

Preferably, the first connecting piece comprises a first matching part, and the first matching part is provided with external threads.

Preferably, the main body further comprises a hollow shaft sleeved on the first connecting piece, and the first connecting piece is operable to move relative to the hollow shaft.

Preferably, the output assembly comprises an output part, and the output part is fixedly connected with the hollow shaft.

Preferably, the main body portion further comprises a locking mechanism having a locked state and an unlocked state, the locking mechanism being capable of preventing rotation of the hollow shaft relative to the housing when in the locked state and capable of rotating relative to the housing when in the unlocked state.

Preferably, the main body further includes an operating mechanism including an operating member capable of controlling switching of the lock mechanism between the locked state and the unlocked state.

Preferably, the operating member is switchable between a first position in which the operating member extends at least partially out of the housing and a second position in which the operating member does not extend beyond the outer contour of the housing.

Preferably, when the operating member is switched to the first position, the locking mechanism is switched to the locked state, and when the operating member is switched to the second position, the locking mechanism is switched to the unlocked state.

Preferably, the locking mechanism comprises a first locking member fixedly arranged relative to the hollow shaft, a second locking member movably arranged relative to the housing, and a first elastic member positioned between the housing and the second locking member; when the operating part is located at the first position, the first elastic part is in a release state, and the first locking part and the second locking part are mutually matched and connected; when the operating piece is at the second position, the operating piece is abutted against the second locking piece so that the elastic element is in a compressed state, and the first locking piece and the second locking piece are separated from each other.

Preferably, the first connecting member comprises a transmission element, and the operating member is operable to drive the first connecting member to move through the transmission element.

Preferably, the operating mechanism further comprises a base rotatable relative to the housing about a second axis of rotation, the operating member being pivotable relative to the base between a first operating position in which the operating member is disengaged from the transmission element and a second operating position in which the operating member is engaged with the transmission element so as to be able to drive the first link to rotate about the second axis of rotation.

Preferably, the output assembly comprises an output portion rotatable about a third axis of rotation, the output portion comprising a plurality of ratchet teeth circumferentially distributed about the third axis of rotation.

Preferably, the third axis of rotation is parallel to and spaced from the axis of the motor.

Preferably, a holding handle extending at a certain angle to the axis of the motor is disposed on the housing, and the axis of the motor and the holding handle are respectively located on two opposite sides of the third rotation axis.

Preferably, the output assembly comprises an output shaft, which is coaxially arranged and fixedly connected with the first connecting piece.

Preferably, the main body further comprises two pairs of limit feet which are diagonally arranged.

The invention also provides a polishing part which is convenient to be matched and connected with the main body part of the polishing tool.

The invention provides a technical scheme that: a sanding portion of an abrading tool for removably coupling with a body portion of the abrading tool, the sanding portion comprising: a body; an input assembly at least partially housed in the body; the input assembly can rotate around a first rotation axis relative to the body, the input assembly comprises an eccentric element, the eccentric element is eccentrically arranged relative to the first rotation axis, the body is connected with the eccentric element, the input assembly further comprises a second connecting piece fixedly arranged relative to the eccentric element, and the second connecting piece can be matched and connected with the main body portion.

Preferably, the body includes a cover body sleeved outside the second connecting member and a plate-shaped body axially fixed to the cover body and located below the cover body, the plate-shaped body is used for mounting the polishing element, and the second connecting member includes a second fitting portion and a second supporting portion connected to the second fitting portion.

Preferably, the second fitting portion is provided as a mounting hole extending in the rotation axis direction, the second support portion is provided as a groove extending in the rotation axis direction, and a lower end of the mounting hole is closer to the plate-like body than a lower end of the groove.

Preferably, the second connector includes a mounting hole extending in the first rotational axis direction, the mounting hole having an internal thread.

Preferably, the second link further includes a groove extending in the first rotation axis direction, the groove communicating with the mounting hole.

Preferably, an outer diameter of the groove is larger than an outer diameter of the mounting hole.

Preferably, the ratio of the axial dimension to the outer diameter dimension of the second support is between 0.33 and 1.7.

Preferably, a central axis of the groove and a central axis of the mounting hole are collinear with the first axis of rotation.

Preferably, the input assembly further comprises an input for transmitting torque, the input being fixedly arranged relative to the second connector.

Preferably, the output comprises a plurality of ratchet teeth circumferentially distributed about the first axis of rotation.

Preferably, the input assembly further comprises a weight, the central axis of the eccentric element being located on one side of the first rotation axis, the weight being located on the other side of the first rotation axis opposite to the central axis.

Preferably, the weight is located at an end of the eccentric element remote from the input.

Preferably, the body comprises a cover body sleeved outside the second connecting piece and a plate-shaped body axially fixed with the cover body, the plate-shaped body is used for installing the polishing element, and the plate-shaped body can be arranged in a circular shape, a rectangular shape or an irregular shape.

Drawings

FIG. 1 is a schematic view of an operating member in a closed state according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a joint between the main body and the polishing portion according to the first embodiment of the present invention.

Fig. 3 is a partially enlarged view of a portion a in fig. 1.

FIG. 4 is a schematic view of the operating member in an open state according to the first embodiment of the present invention.

Fig. 5 is a partially enlarged view of a portion C in fig. 1.

Fig. 6 is a schematic view of the input unit abutting against a large end surface in the first embodiment of the present invention.

Fig. 7 is a partially enlarged view of portion B of fig. 1 according to the present invention.

Figure 8 is a schematic view of the internal duct orientation of the sanding tool according to the first embodiment of the present invention.

Fig. 9 is a schematic view of the positional relationship between the polishing part and the elastic member according to the first embodiment of the present invention.

Fig. 10 is a schematic structural view of a stopper mechanism according to the first embodiment of the present invention.

Fig. 11 is a cross-sectional view of the position of the engaging position of the position-limiting post and the position-limiting hole according to the first embodiment of the present invention.

Fig. 12 is a schematic structural view of a stopper mechanism according to another embodiment of the present invention.

Figure 13 is a schematic view of a grinding section of the present invention mated to another embodiment of a spacing mechanism.

Figure 14 is a partial cross-sectional view of another embodiment of a stop mechanism of the present invention mated with a grinding section.

Fig. 15 is a schematic view showing an internal structure of the grinding tool according to the first embodiment of the present invention.

Fig. 16 is a schematic view of a locking mechanism in a first embodiment of the present invention.

FIG. 17 is a schematic view of the operating mechanism of the operating member of the present invention in the closed position.

FIG. 18 is a schematic view of the operating mechanism of the operating member of the present invention in the operating state.

Figure 19 is a schematic view of the direction of the wind outside the sanding tool in accordance with the first embodiment of the present invention.

Figure 20 is a schematic view of the direction of the wind outside the sanding tool in accordance with the second embodiment of the present invention.

Figure 21 is a schematic view of the internal air path of a sanding tool in accordance with a second embodiment of the present invention.

Figure 22 is a cross-sectional view of a sanding tool according to a second embodiment of the present invention with the sanding part and body portion unmated.

Figure 23 is a cross-sectional view of the body portion and sanding portion of a sanding tool according to a second embodiment of the present invention in mated configuration.

Fig. 24 is a partially enlarged view of a portion D in fig. 22.

Fig. 25 is a schematic structural view of a lock mechanism in the second embodiment of the present invention.

Figure 26 is a schematic view of a locking mechanism in a locking position in a sanding tool according to a third embodiment of the present invention.

Figure 27 is a schematic view of a locking mechanism in an unlocked state in a sanding tool in accordance with a third embodiment of the present invention.

Figure 28 shows a fourth embodiment of the present invention in which the sanding tool has a body portion and a sanding portion that are not engaged.

Fig. 29 is a sectional view in the direction F-F in fig. 28.

Fig. 30 is a sectional view of the lock mechanism in an unlocked state in the fifth embodiment of the present invention.

Fig. 31 is a sectional view of the locking mechanism in a locked state in the fifth embodiment of the present invention.

FIG. 32 is a cross-sectional view of the operating member of the sixth embodiment of the present invention disconnected from the first connector.

FIG. 33 is a sectional view showing the operation member coupled to the first coupling member in the sixth embodiment of the present invention.

Detailed Description

Some exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings. Like reference numerals refer to like parts throughout the several views of the drawings.

Referring to fig. 1-3, reference numeral 10 generally indicates an exemplary hand tool. Hereinafter, specifically referring to the sander 10 as an exemplary hand-held power tool, the sander 10 includes a body portion 11 and a sanding portion 12, the body portion 11 includes a housing 110, a motor 112 located in the housing 110, and an output assembly 113 driven to rotate by the motor 112. The polishing portion 12 includes a body 120 and an input assembly 121 disposed in the body 120, wherein a polishing element (e.g., sand paper) can be mounted on a side of the body 120 facing the surface to be processed, and the input assembly 121 can rotate relative to the body 120 under the driving of the output assembly 113 to drive the body 120 to work. To achieve the inseparable connection of the sanding section 12 to the body section 11 in the axial direction of the motor 112, the body section 11 further comprises a first connecting member 114, the sanding section 12 comprises a second connecting member 122 cooperating with the first connecting member 114, and the first connecting member 114 and the second connecting member 122 are rotatable together with the input assembly 121 when the first connecting member 114 and the second connecting member 122 are coupled to inseparably connect the sanding section 12 to the body section 11 in the axial direction of the motor 112. In order to ensure that the first connecting element 114 and the second connecting element 122 are connected reliably and stably, the first connecting element 114 and the second connecting element 122 are preferably connected by means of a threaded connection.

In this embodiment, the output assembly 113 includes a first driving wheel 1131 disposed coaxially with the motor 112 and driven by the motor 112 to rotate, and a second driving wheel 1132 driven by the first driving wheel 1131 and having a rotation axis spaced from the rotation axis of the first driving wheel 1131, and in order to reduce noise and vibration of the first driving wheel 1131 and the second driving wheel 1132 during torque transmission, it is preferable that the first driving wheel 1131 and the second driving wheel 1132 transmit power therebetween by means of a transmission belt. In this embodiment, in order to realize better supporting the second driving wheel 1132, the main body 11 further includes a connecting shaft 115 disposed in the housing 110, and the second driving wheel 1132 is sleeved on the outer side of the connecting shaft 115 to support the second driving wheel 1132 through the connecting shaft 115. In this embodiment, the second driving wheel 1132 is fixedly sleeved outside the connecting shaft 115 to drive the connecting shaft 115 to rotate, and the connecting shaft 115 is rotatably disposed on the housing 110 through the supporting bearing 116. It is understood that in other embodiments, the connecting shaft 115 may be fixedly connected with the housing 110, i.e. non-rotatably fixed to the housing 110, and the second driving wheel 1132 may be rotatably connected with the connecting shaft 115 to support the second driving wheel 1132 through the connecting shaft 115. To effect the transfer of the output torque of the output assembly 113 to the input assembly 121, preferably, the output assembly 113 further includes an output portion 1133 fixedly connected to the second drive wheel 1132, and the input assembly 121 includes an input portion 1210 engaged with the output portion 1133. In one embodiment, the output portion 1133 and the input portion 1210 are configured as end ratchet teeth, and in other embodiments, the output portion 1133 and the input portion 1210 may be configured in other forms capable of transmitting torque, such as a flat square structure. Through the cooperation of the output portion 1133 and the input portion 1210, the output assembly 113 transmits the torque to the input assembly 121 to drive the input assembly 121 to rotate relative to the body 120.

It is understood that in other embodiments, the output portion 1133 may also be disposed outside the connecting shaft 115, and the second driving wheel 1132 may drive the connecting shaft 115 to rotate, and then the connecting shaft 115 may drive the output portion 1133 to rotate, that is, the connecting shaft 115 may be a part of the output assembly 113 and may serve as a driving shaft for driving the output portion 1133.

With continued reference to FIG. 1, the input assembly 121 is axially disposed at least partially as an eccentric member 124, with the central axis X1 of the eccentric member 124 being spaced from the rotational axis X0 of the input assembly 121, i.e., the eccentric distance e exists between the central axis X1 of the eccentric member 124 and the rotational axis X0 thereof. The body 120 comprises a plate-shaped body 1202 for mounting sandpaper and a cover 1201 fixedly connected with the plate-shaped body 1202, wherein the cover 1201 is arranged on the outer side of the eccentric element 124 through a mounting bearing 123 so as to drive the body 120 to move through the rotation of the eccentric element 124. It will be appreciated that, since the axis of rotation X0 of the eccentric element 124 (i.e. the axis of rotation X0 of the input assembly) is spaced from the central axis X1 of the eccentric element 124, i.e. the eccentric element 124 is asymmetrically weighted with respect to its axis of rotation X0, the eccentric element 124 tends to wobble during rotation, and in order to compensate for the imbalance of mass during rotation of the eccentric element 124 with respect to its axis of rotation X0, the input assembly 121 further comprises a counterweight 1211, the central axis of which is located on one side of the axis of rotation X0 of the input assembly, the counterweight 1211 being located on the other side of the first axis of rotation X0 opposite to the central axis. It is understood that different sanding sections 12, such as a round sanding section or a plate sanding section, have different eccentric distances e due to different respective operating conditions. Thus, the mass of the counterbalance 1211 required to compensate for the eccentric elements 124 of different sanding portions also varies. In this embodiment, the balance blocks 1211 are disposed in the bottom plate, so that different polishing portions (such as a circular polishing portion or a plate polishing portion) can have independent balance blocks 1211, thereby achieving the best damping effect. It is understood that the weight 1211 may be disposed below the mounting bearing 123, may be disposed above the mounting bearing 123, and may be disposed below both the mounting bearing 123 and the mounting bearing.

Referring to fig. 1, 2, 5 and 6, in the present embodiment, the first connecting part 114 includes a first mating portion 1141 located below the first connecting part for connecting with the second connecting part 122, preferably, the first mating portion 1141 is provided with an external thread 1140, the second connecting part 122 includes a second mating portion 1221 mating with the first mating portion 1141, preferably, the second mating portion 1221 is configured as a mounting hole capable of receiving the first mating portion 1141, and at least a part of an inner circumferential surface of the mounting hole is provided with an internal thread 1220 mating with the external thread 1140. In this embodiment, the connecting shaft 115 is a hollow shaft, the first connecting member 114 is at least partially located in the hollow shaft 115, and in order to prevent the first connecting member 114 from falling off from the hollow shaft, a flange 1142 is provided at an upper end of the first connecting member 114. In this embodiment, in order to ensure the coaxiality of the main body 11 and the sanding part 12, i.e., the coaxiality between the first connecting member 114 or the connecting shaft 115 and the rotation axis of the input assembly 121, so as to reduce the vibration of the sanding machine 10 during operation, the second connecting member 122 further includes a supporting portion 1222, and preferably, the second supporting portion 1222 is provided as a groove extending in the direction of the rotation axis, and the first supporting portion 1152 having substantially the same outer diameter as that of the groove is formed below the connecting shaft 115 for extending into the groove. The connecting shaft 115 extends to a length L1 of the mounting hole, that is, the axial dimension of the first support part 1152 is L1, and L1 is between 4mm and 30mm, preferably, L1 is between 11.25mm and 13.75mm, and more preferably, L1 is 12.5 mm. The first support 1152 and the second support 1222 (recess) are mated with a small gap therebetween, i.e., the first support 1152 has an outer diameter substantially the same as the outer diameter of the second support 1222 (recess), hereinafter referred to as mating diameter D1, the mating diameter D1 is between 7mm and 12mm, preferably the mating diameter D1 is between 8.55mm and 10.45mm, and more preferably the mating diameter D1 is 9.5 mm.

It can be understood that when the mating diameter D1 is a specific value, the larger the mating length L1, the better the mating effect, i.e., the better the coaxiality will be. However, the longer L1, the higher the overall height. Referring to fig. 6, in the present embodiment, in order to ensure that the coaxiality of the whole device can be ensured when the mating length is small, the main body 11 is provided with an abutting end surface abutting against the upper end surface of the input assembly 121, and the diameter D2 of the abutting end surface is greater than D1. In this embodiment, the abutting end surface is an end surface of the second driving wheel 1132 abutting against the input assembly 121, but it should be understood that in other embodiments, the abutting end surface may also be an end surface fixedly connected to the second driving wheel 1132 and abutting against the input assembly 121. In this embodiment, by using the large end surface abutment, the ratio of the matching length L1 to the matching diameter D1 is made as small as 0.33, which can ensure that the matching length L1 is made short when D1 is a certain value, but it can be understood that the larger the value of L1/D1 is, the more the stability of the coaxiality is facilitated on the premise of ensuring the large end surface of D2.

In this embodiment, the sanding part 12 may be a circular sanding part as shown in fig. 1, fig. 2 and fig. 8 and a slab sanding part as shown in fig. 9, fig. 13 and fig. 15, wherein the plate-shaped body 1202 of the circular sanding plate is circular, and the plate-shaped body 1202 of the slab sanding plate is rectangular, so that an operator can alternatively couple the circular sanding part or the slab sanding part with the main body 11 according to different sanding requirements. The body 120 of the round sanding part revolves during sanding, and at the same time, the body 120 rotates due to the eccentric member 124 by the installation of the bearing 123, that is, the round sanding block performs orbital motion of rotation and revolution, so that the round sanding block can be installed to the body 11 when an operator needs to remove a large amount of abrasive. In this embodiment, the sanding portion may be a sanding portion having a plate-shaped body with a size of 1/4 sand, or a sanding portion having a plate-shaped body with a size of 1/3 sand, and it should be noted that the 1/3 sand bottom plate and the 1/4 bottom plate described herein mean that the plate-shaped body 1202 of the sanding portion corresponds to or is substantially the same as 3 or 4 equal parts of the sandpaper standard (size 228mm × 280mm) known in the art. The sanding portion fixes abrasive paper to the plate-shaped body 1202 through the elastic clamping piece, and the circular sanding sole plate fixes abrasive paper to the plate-shaped body through felts and other modes. It is understood that the board sand base plate may also be used to secure sandpaper using felt or the like.

The plate-like main body 1202 of the plate-sand bed (1/3 sand bed and 1/4 bed) is rectangular, and if the plate-like main body 1202 of the plate-sand unit revolves and rotates by the input unit 121, the four corners of the rectangular plate-like main body 1201 rotating at high speed are likely to cause a risk, and therefore the sander 10 further includes a stopper mechanism 117 for restricting the plate-sand bed from rotating.

Referring to fig. 9-14, the limiting structure 117 includes a limiting substrate 1170 and limiting legs 1171 disposed on the limiting substrate 1170, wherein each of the limiting legs 1171 includes a plurality of flexible columns, preferably an even number of flexible columns, and more preferably a number of flexible columns of 4 or 6. In this embodiment, the limiting mechanism 117 is located in the main body 11, so that it is not necessary to separately provide a limiting structure for each sanding plate or other sanding sole plate that needs to limit its rotation. The upper end of the stopper leg 1171 is detachably fixed to the housing 110, so that the stopper leg 1171 can be replaced after being damaged due to long-term deformation under stress. Preferably, the upper end of the limit leg 1171 is connected to the housing by a screw, so that the limit leg 1171 can be stably fixed to the housing 110 and is not easily automatically separated from the housing 110. Referring to fig. 2, since the upper end of the limiting mechanism 117 is covered by the housing 110, that is, the upper end of the limiting pin 1171 is not exposed outside the housing 110, and in addition, the lower end of the limiting mechanism 117 is blocked by the limiting substrate 1170, so that tools such as a screwdriver cannot extend into the housing 110, and the installation of the limiting mechanism 117 is difficult. In this embodiment, the plurality of flexible posts of each stopper leg 1171 are surrounded by a hollow through hole and the through hole penetrates the stopper substrate 1170, so that an operator can screw in screws through the through holes from below the substrate 1170. A side surface of the limiting substrate 1170 departing from the limiting leg 1171 is provided with a limiting post 1172, and the body 120 of the plate sanding part is provided with a limiting hole 1203 matched with the limiting post 1172 to limit the plate sanding bottom plate to rotate, preferably, an elastic element 900 is further arranged between the limiting hole 1203 and the limiting post 1172. Referring to fig. 11, the elastic element 900 includes a first elastic member 901 located between the substrate 1170 and the opening of the limiting hole 1203, and is used for isolating the vibration of the limiting hole 1203 and the limiting mechanism 117 in the up-down direction, that is, isolating the vibration between the body 120 and the limiting mechanism 117 in the up-down direction or the axial direction. The elastic element 900 further comprises a second elastic element 902 located between the position-limiting post 1172 and the sidewall of the position-limiting hole 1203, for isolating the vibration of the position-limiting post 1172 and the position-limiting hole 1203 in the radial direction, i.e. isolating the vibration between the body 120 and the position-limiting mechanism 117 in the radial direction. Referring to fig. 9, in this embodiment, since the sanding part 12 of the sanding machine 10 may be a plurality of types (such as a round sanding part or a plate sanding part), the plate sanding part required to be provided with the limiting mechanism 117 includes another type of sanding part (also called mouse-mouse sand) whose plate-shaped body is approximately in an iron shape, in addition to the plate-shaped body having the shape of 1/3 sand and the sand bottom plate 1/4 sand bottom plate. When all being equipped with 4 elastic element on every board sand bottom plate, then need more elastic element, the cost is higher, in addition because the cooperation between elastic element 900 and spacing hole 12 is mostly interference fit, the elastic element 900 installation is more difficult, consequently, the quantity of elastic element 900 installation is more, and the assembly is also more difficult.

Referring to fig. 12 to 14, the present invention further provides another structure of the limiting mechanism 117 ', which is the same as the limiting mechanism 117 in the above-mentioned embodiment, in that the limiting mechanism 117 ' includes a limiting substrate 1170 ', limiting legs 1171 ' provided on the limiting substrate 1170 ', each of the limiting legs 1171 ' includes a plurality of flexible columns, the limiting mechanism 117 ' is detachably fixed to the housing 110 of the main body 11 by screws or the like, the plurality of flexible columns of each of the limiting legs 1171 ' surround a hollow through hole, and the through hole penetrates through the limiting substrate 1170 '. Different from the above embodiments, in this embodiment, the limiting column 1172 ' is disposed on the sanding portion, the hollow through hole surrounded by the plurality of flexible columns of the limiting leg 1171 ' is the limiting hole 1203 ', and the elastic element 900 ' is disposed at an end of the hollow through hole close to the limiting substrate 1170 '. Referring to fig. 14, similar to the structure of the elastic element 900 in the above embodiment, the elastic element 900 'in this embodiment includes a first elastic member 901' between the body 120 and the opening of the limiting hole 1203 'to isolate the vibration of the body 120 and the limiting mechanism 117' in the up-and-down direction; the resilient member 900 ' further includes a second resilient member 902 ' located between the retention post 1172 ' and the sidewall of the retention aperture 1203 ' to isolate the vibration of the retention post 1172 ' and the retention aperture 1203 ' in the radial direction, i.e., isolate the vibration between the body 120 and the retention mechanism 117 ' in the radial direction.

Referring to fig. 1, when the sanding part 12 is connected to the main body 11 or separated from the main body 11, the first connecting member 114 needs to rotate relative to the second connecting member 122, but as can be seen from the above description of the structure of the main body 11 and the sanding part 12, when the first connecting member 114 rotates under operation, the external thread 1140 of the first coupling part 1141 interacts with the internal thread 1220 of the second coupling part 1221, so that the input assembly 121 rotates together, the input assembly 121 further drives the output assembly 113 and the connecting shaft 115 to rotate together through the input part 1210 and the output part 1133, so that the relative rotation between the threaded rod 1140 and the mounting hole cannot be realized, and the external thread 1140 of the first coupling part 1141 and the internal thread 1220 of the second coupling part 1221 cannot be screwed or unscrewed. Referring to fig. 1, 15 and 16, the sander 10 of the present invention further includes a locking mechanism 118, the locking mechanism 118 being capable of effecting circumferential locking of the input assembly 121 to effect rotation of the first attachment member 114 relative to the second attachment member 122. Preferably, the locking mechanism 118 is provided on the main body portion 11, the locking mechanism 118 has a locked state and an unlocked state, when the locking mechanism 118 is in the locked state, the locking mechanism 118 locks the input assembly 121 circumferentially, that is, the input assembly 121 cannot rotate relative to the housing 110, and when the locking mechanism 118 is in the unlocked state, the locking mechanism 118 unlocks the input assembly 121 circumferentially, that is, the input assembly 121 can rotate relative to the housing 110.

Referring to fig. 1 and 16, in the present embodiment, in order to facilitate locking of the input assembly 121, the locking mechanism 118 circumferentially locks the input assembly 121 by circumferentially locking the connecting shaft 115. The locking mechanism 118 includes a first locking member 1181 that is movable but not rotatable relative to the housing 110 and a second locking member 1182 fixedly connected to or integrally provided with the connecting shaft 115, wherein the first locking member 1181 is movable between a first position and a second position, when the first locking member 1181 is located at the first position, the first locking member 1181 is coupled with the second locking member 1182, that is, the locking mechanism 118 is in a locking state, and the connecting shaft 115 is locked circumferentially. In the embodiment, as can be seen from the above description, since the second driving wheel 1132 is fixedly sleeved outside the connecting shaft 115 to drive the connecting shaft 115 to rotate, that is, the connecting shaft 115 and the output assembly 113 are connected in a non-rotatable manner, when the connecting shaft 115 is locked, the output assembly 113 is also locked, and cannot rotate in the circumferential direction. Furthermore, since the output member 113 and the input member 121 are engaged or transmitted with torque by ratchet, that is, the output member 113 and the input member 121 are not rotatable relative to each other in the circumferential direction, when the connecting shaft 115 is locked, the input member 121 is also locked in the circumferential direction, and therefore, the first connecting member 114 is operable to rotate relative to the second connecting member 122. When the first locking member 1181 is located at the second position, the first locking member 1181 is separated from the second locking member 1182, that is, the locking mechanism 118 is in an unlocked state, the locking mechanism 118 releases the circumferential locking of the connecting shaft 115, and the connecting shaft 115 can rotate relative to the housing 110.

Preferably, the first locking member 1181 is a locking block provided with a rectangular hole 1810, and the second locking member 1182 is a rectangular shaft section having an outer peripheral shape corresponding to the rectangular hole, wherein the first locking member 1181 is capable of moving between a first position and a second position along the axial direction of the connecting shaft 115. Referring to fig. 4, when the first locking member 1181 moves upward from the second position below to the first position, the flat hole 1810 of the locking block is coupled to the off-square shaft section, and the input assembly 121 is locked in the circumferential direction, referring to fig. 3, when the first locking member 1181 moves downward from the first position to the second position, the flat hole of the first locking member 1181 is separated from the flat shaft section and is sleeved on the outer side of the connecting shaft 115, and since the aperture of the minimum position of the flat hole is larger than the outer diameter of the connecting shaft 115, the connecting shaft 115 can rotate freely in the circumferential direction. It is understood that the first locking member 1181 may be configured as a locking block with other shaped holes, such as a diamond, a triangle, a hexagon or other irregular figures, and the second locking member 1182 may be configured as a shaped shaft segment corresponding to the above-mentioned shaped holes, which will not be described herein.

Preferably, referring to fig. 17-18, in order to facilitate the operation of the first connector 114 to mount the sanding section 12 to the main body 11, the main body 11 further comprises an operating mechanism 119, the operating mechanism 119 comprising an operating member 1190 for being gripped by an operator and a base 1191, the operating member 1190 being pivotally provided to the base 1191 by a pivot axis to switch between a first operating position and a second operating position. Preferably, the pivot shafts include a first pivot shaft 1901 fixed to the operating member 1190 and a second pivot shaft 1911 fixed to the base 1191, the base 1191 is provided with a first sliding slot 1912 for the first pivot shaft 1901 to rotate, and the operating member 1190 is provided with a second sliding slot (not shown) for the second pivot shaft 1911 to move.

Referring to fig. 1, 3, 4, 17 and 18, the operation member 1190 can be switched between a first position in a closed state (see fig. 1 and 17) and a second position in an open state, where it should be noted that, in the first position, the operation member at least partially protrudes out of the housing, in the second position, the operation member does not exceed the outer contour of the housing, that is, in the first position, the operation member 1190 and the grip handle 111 are substantially located on the same horizontal line, and in the second position, the operation member 1190 and the grip handle 111 are disposed at an angle. The operating mechanism 119 further comprises an abutment 1904 between the operating member 1190 and the first locking member 1181, and the locking mechanism 118 further comprises a first resilient element 1905 located below the first locking member 1181. Referring to fig. 3, when the operation member 1190 is in a closed state, the operation member 1190 presses the abutting member 1904 downward, and meanwhile, the abutting member 1904 further presses the first elastic element 1905 through the first locking member 1181, so that the first elastic element 1905 is compressed, and the first locking member 1181 is located at a second position below, at this time, the connection shaft 115 can rotate together with the input component 121 under the driving of the motor 112 after the power switch 1120 is started; when the operating member 1190 moves from the closed state shown in fig. 17 to the open state (not shown in the drawings) under the action of the first elastic element 1905, the abutting member 1904 and the first locking member 1181 move upward under the action of the first elastic element 1905 of 1182, so that the first locking member 1181 moves upward to the first position, and therefore, the flat hole 1810 of the locking block is coupled to the biased shaft segment, and the connecting shaft 115 is circumferentially locked, that is, the input assembly 121 is circumferentially locked.

In this implementation, for the convenience to the operation of first connecting piece 114, make grinder 10 simple structure simultaneously, in this implementation, operating part 1190 can also be used for driving first connecting piece 114 and rotate, and behind operating part 1190 is located the open mode, operating part 1190 also is when operating part 1190 is in first operating position, and operating part 1190 still can not drive first connecting piece 114 rotates, and when operating part 1190 rotated to the second operating position around the pivot axis by first operating position, operating part 1190 can drive first connecting piece 114 and rotate around its axis (also the axis of input component 121). In this embodiment, the first connecting member is provided with a transmission element, and referring to fig. 3 and 4, in this embodiment, the transmission element is a second lug 1401 arranged on the first connecting member 114, the operation member includes a first lug 1903 corresponding to the second lug 1401, and when the operation member 1190 is in the second operation state, the first lug 1903 is coupled to the second lug 1401, so that the operation member 1190 can drive the base 1191 and the first connecting member 114 to rotate together relative to the housing 110, thereby enabling the polishing portion 12 to be connected to or separated from the main body portion 11.

Referring to fig. 4, the main body 11 further includes a grip handle 111 for gripping, and a groove 1110 is provided below the grip handle 111 for fingers to bend and extend into when gripping. In addition, the holding handle 111 and the groove 1110 are provided with a power supply unit at an end away from the motor, preferably, the power supply unit is a battery pack 13 in this embodiment, and the battery pack 13 is detachably connected to the housing 110. It is understood that the power supply unit may also adopt an alternating current power supply unit in other embodiments.

Referring to fig. 19, the sander 10 further includes two cooling portions, namely a first cooling portion 61 and a second cooling portion 62, and a dust guiding portion 63, the two cooling portions and the dust guiding portion respectively include a fan disposed in the housing 110, and an air inlet and an air outlet, that is, the first cooling portion 61 includes a first fan 610 (see fig. 4), a first air inlet 611 and a first air outlet 612, the second cooling portion 62 includes a second fan 620, a second air inlet 621 and a second air outlet 622, and the dust guiding portion 63 includes a third fan 630, a third air inlet 631 and a third air outlet 632. The first fan 610 is a centrifugal fan located at one end of the motor 112 far from the grinding part 12, and the first air inlet 611 is located at one end of the motor close to the grinding part 12 and one end far from the grinding part 12, that is, the first air inlet 611 is distributed along the axial direction of the motor 113. The first air outlet 612 is located in a region corresponding to the first fan 610, i.e. between the upper and lower air inlets of the motor 113. In this embodiment, preferably, the first fan 610 is located above the stator and the rotor in the motor 112, and the air entering from the first air inlet 611 near one end of the grinding part 12 flows through the stator and the rotor of the motor under the action of the first fan 610, and then flows out from the first air outlet 612, and the air entering from the first air inlet far from one end of the grinding part 12 flows through the commutator (located above the fan) in the motor 112, and then flows out from the first air outlet 612. Therefore, the first cooling portion 61 can take away heat generated by the motor 112 to achieve cooling of the motor 112. In this embodiment, the second fan 620 is fixedly connected to the second driving wheel 1132 and is driven to rotate by the second driving wheel 1132, the second fan 620 is located below the second driving wheel 1132 to cool the second driving wheel 113 and the transmission belt located between the first driving wheel 1131 and the second driving wheel 1132, the second air inlet 621 and the second air outlet 622 are located on the area of the housing 110 corresponding to the second fan 620 in the housing 110, and preferably, the second air inlet 621 and the second air outlet 622 are arranged along the up and down direction on the housing 110 corresponding to the area of the second fan 620. The third fan 630 is located above the grinding part 12 and is disposed adjacent to the upper end portion of the grinding part 12, and preferably, as shown in fig. 4, the third fan 630 and the second fan 620 share the same hub, in other words, the second fan 620 is located above the hub, and the third fan 630 is located below the hub. The third air inlet 631 is located on a side surface of the plate-shaped body 120 facing the sandpaper and the sandpaper, and the third air outlet 632 is a dust collecting outlet communicated with the third fan 630 to blow the debris and dust generated by the polishing part 12 during the polishing process to a dust bag or a dust box through the third fan 630.

Referring to fig. 20-23, a sander 10 ' (hereinafter referred to as a second embodiment) according to another structure of the present invention is similar to the sander 10 described above, and includes a main body 11 ' and a sanding part 12 ', the main body 11 ' includes a housing 110 ', a motor 112 ' disposed in the housing 110 ', and an output assembly 113 ' driven by the motor 112 ' to rotate. The grinding part 12 'includes a body 120' and an input assembly 121 'located in the body, wherein a side of the body 120' facing the surface to be processed can be provided with a grinding element (e.g., sandpaper), and the input assembly 121 'can rotate relative to the body 120' under the driving of the output assembly 113 'to drive the body 120' to work. In order to achieve the inseparable connection of the sanding section 12 'to the main body 11 in the axial direction of the motor, the main body 11' further comprises a first connection element 114 ', and the sanding section 12 comprises a second connection element 122' cooperating with the first connection element 114 ', wherein the first connection element 114' is rotatable together with the second connection element 122 'upon actuation of the motor 112'. Preferably, in order to ensure the connection between the first connecting member 114 ' and the second connecting member 122 ' is reliable and stable, the first connecting member 114 ' and the second connecting member 122 ' are preferably connected by a threaded connection, that is, the first connecting member 114 ' is provided with a first coupling portion 1141 ', and the second connecting member 122 ' is provided with a second coupling portion 1221 ' which is matched with the first coupling portion 1141 '. Preferably, the first coupling portion 1141 'is provided with an external thread 1140', and preferably, the second coupling portion 1221 'is provided as a mounting hole capable of receiving the first coupling portion 1141', and at least a part of an inner circumferential surface of the mounting hole is provided with an internal thread 1220 'coupled with the external thread 1140'. The output assembly 113 'in this embodiment includes a first drive wheel 1131' disposed coaxially with the motor 112 'and driven to rotate by the motor 112', and a second drive wheel 1132 'driven by the first drive wheel 1131' and having a rotational axis spaced from the rotational axis of the first drive wheel 1131 ', with the second drive wheel 1132' supporting a hollow connecting shaft 115 'rotatably disposed within the housing 110'. The main difference between this embodiment and the sander 10 of the above-mentioned embodiment is that the rotational axis of the input assembly 121 ' is located between the axis of the motor 112 ' and the battery pack 13 '. Because the motor 112 ' and the battery pack 13 ' of the sander 10 ' are relatively heavy relative to the rest of the machine, the center of gravity of the machine is located between the motor 112 ' and the battery pack 13 ', so that the center of gravity of the machine can be close to both the grip handle 111 ' and the axis of rotation of the input assembly 121 ', which makes the sanding machine easy to grip and the output of the machine stable. In addition, as can be seen from the above description of the embodiments, in order to adapt to the plate-sanding sole plate, the main body 11 'of the sanding machine 10' needs to be provided with a limiting mechanism, and in order to reduce the vibration of the whole machine during operation, the limiting mechanism usually includes a plurality of limiting legs. In the above embodiment, since the rotation axis of the input assembly 121 is located on the side of the motor 112 away from the grip handle 111, the length of the whole device is increased by the position-limiting foot, and in the present embodiment, since the rotation axis of the input assembly 121 'is located on the side of the motor 112' close to the grip handle 111 ', the position-limiting mechanism or the position-limiting foot is moved toward the battery pack 13', which is beneficial to reducing the length of the whole device.

In the above embodiment, the cooling of the motor 112 is completely performed by the first cooling portion 61, and the large fan 620 of the second cooling portion is not used, and thus the cooling effect of the motor 112 is poor. In order to achieve a better cooling effect for the motor 112, the present embodiment provides another cooling structure different from the above-described embodiments. Referring to fig. 20 and 21, the cooling portion of the sander 10 ' in this embodiment includes a first cooling portion (not shown) for cooling the motor 112 ' and a second cooling portion (not shown) for cooling the second drive wheel 1132 ' and the drive belt connecting the first drive wheel 1131 ' and the second drive wheel 1132 '. The first cooling part includes a first fan 610 ', and the first fan 610 ' is located below a portion where the stator and the rotor of the motor 112 ' are located. Second fan 620 'is positioned below second drive wheel 1132'. In this embodiment, in order to reduce the length of the sander 10 ' in the horizontal direction, the second fan 620 ' and the first fan 610 ' are disposed in a vertically staggered manner, that is, the first fan 610 ' and the second fan 620 ' are not at the same horizontal height, and preferably, the second fan 620 ' is located below the first fan 610 ' in the height direction. In this embodiment, the first cooling portion and the second cooling portion share the same air inlet 630 ' and the same air outlet 640 ', at least a portion of the air inlet 630 ' is located above the stator and the rotor of the motor 112 ', at least a portion of the air outlet 640 ' is located on the housing 110 ' in the area corresponding to the second fan 620 ', the second fan 620 ' is capable of guiding the airflow passing through the first fan 610 ' out of the air outlet 640, so that the airflow stably enters the housing 110 ' from the air inlet 630 ', moves to the first fan 610 via the motor 112 ', and then is guided out of the housing 110 ' by the second fan 620 ', that is, the first cooling portion for cooling the motor 112 ' is communicated with the second cooling portion mainly for cooling the second driving wheel 1132 ', and the path of the cooling air path enters from the upper end (the end far from the grinding portion 12 ') of the motor 112 ' after entering from the air inlet 630 ', flows through the interior of the motor 112 ', flows out from the lower end (the end near the polishing part 12 ') of the motor 112 ', and then flows out from the air outlet 640 ' after being guided by the second fan 620 '. Thereby achieving cooling of the motor 112 ', the second drive wheel 1132', the belt, and the like.

The present embodiment further provides a locking mechanism 118 ' different from the locking mechanism 118 of the above embodiment, referring to fig. 24 and 25, the second locking member 1182 ' in the present embodiment is a flange body fixed on the outer side of the connecting shaft 115 ', wherein the flange body is provided with a stopping groove 1810 ', and the first locking member 1181 ' is an axially movable stopping block, when the stopping block moves axially upward to the first position, the stopping block is at least partially located in the stopping groove 1810 ' to limit the connecting shaft 115 ' to rotate circumferentially, and when the stopping block moves axially downward to the second position, the stopping block is separated from the stopping groove 1810 ', and the connecting shaft 115 ' can rotate freely. It is understood that in other embodiments, the moving direction of the stop block may also be along other directions, such as a radial direction or a direction forming other angles with the axial direction, and the description is omitted here. In addition, the present embodiment also realizes the switching of the lock mechanism 118 'between the locked state and the unlocked state by the operation member 1190', as in the above-described embodiment. Referring to fig. 24, when the operation member 1190 ' is in the closed state, the operation member 1190 ' axially abuts against the first locking member 1181 ' (the stopper), the first locking member 1181 ' compresses the first elastic element 1905 ' downward, so that the first locking member 1181 ' is located at the second position below, the first locking member 1181 ' is separated from the second locking member 1182 ', and the locking mechanism 118 ' is in the unlocked state; when the operating member 1190 ' is switched from the closed state to the open state, the second locking member 1182 ' moves upward to the first position under the action of the first elastic element 1905 ', the stop block is separated from the stop groove 1810 ', and the locking mechanism 118 ' is in the locking state.

Fig. 26-27 show a sander 10 "(hereinafter referred to as a third embodiment) of another construction of the present invention, which includes a main body 11" and a sanding section 12 ", the main body 11" including a housing 110 ", a motor 112" disposed in the housing 110 ", and an output assembly 113" driven to rotate by the motor 112 ". The grinding part 12 "comprises a body 120" and an input assembly 121 positioned in the body 120 ", wherein a grinding element (such as sand paper) can be installed on one side of the body 120" facing the surface to be processed, and the input assembly 121 "can rotate relative to the body 120" under the driving of the output assembly 113 "so as to drive the body 120" to work. In order to achieve an inseparable connection of the sanding section 12 "to the body section 11" in the motor axial direction, the body section 11 "further comprises a first connection element 114", and the sanding section 12 "comprises a second connection element 122" cooperating with the first connection element 114 ", wherein the first connection element 114" is rotatable together with the second connection element 122 "under the drive of the motor 112". Preferably, in order to ensure that the first connecting element 114 "and the second connecting element 122" are connected reliably and stably, the first connecting element 114 "and the second connecting element 122" are preferably connected by means of a threaded connection. In this embodiment, the output assembly 113 "includes an output shaft 1135" fixedly connected to the motor 112 "and driven to rotate coaxially therewith. The first coupling member 114 "includes external threads 1140" disposed about an outer periphery thereof, and the first coupling member 114 "is fixedly coupled to the output shaft 1135" to coaxially drive the first coupling member 114 "for rotation. Preferably, the first connector 114 "is integrally formed with the output shaft 1135". The first connecting member 114 "includes a first mating portion located therebelow for connecting with the second connecting member 122", preferably, the first mating portion 1141 "is provided with an external thread 1140", the second connecting member 122 "includes a second mating portion 1221" mating with the first mating portion 1141 ", preferably, the second mating portion 1221" is configured as a mounting hole capable of receiving the first mating portion 1141 ", and at least a part of the inner circumferential surface of the mounting hole is provided with an internal thread 1220" mating with the external thread 1140 ". Therefore, in this embodiment, the motor 112 "will transmit the rotation motion to the first connecting member 114" through the output shaft 1135 ", and the first connecting member 114" drives the input assembly 121 "to rotate relative to the plate-shaped body 120" through the thread structure, so as to drive the plate-shaped body 120 "to perform the grinding operation, in other words, the mating of the external thread 1140 of the first connecting member 114" and the internal thread 1220 "of the mounting hole in this embodiment realizes both the axial connection between the main body portion 11" and the grinding portion 12 "and the torque transmission between the main body portion 11" and the grinding portion 12 ".

The present embodiment also provides a locking mechanism 118 "that differs from the embodiments described above in that the locking mechanism 118" enables circumferential locking of the input assembly 121 "to enable rotation of the first connector 114" relative to the second connector 122 ". Preferably, the locking mechanism 118 "is provided in the body portion 11", the locking mechanism 181 "has a locked state and an unlocked state, the locking mechanism 118" locks the input unit 121 "in the circumferential direction, that is, the input unit 121" cannot rotate relative to the housing 110 "when the locking mechanism 118" is in the locked state, and the locking mechanism 118 "unlocks the input unit 121" in the circumferential direction, that is, the input unit 121 "can rotate relative to the housing 110" when the locking mechanism 118 "is in the unlocked state. The locking mechanism 118 "includes a first locking member 1181" movable relative to the housing 110 "and a second locking member 1182" fixedly connected to or integrally disposed with the input assembly 121 ", preferably, the second locking member 1182" is located at an end of the input assembly 121 "far from the plate-shaped body 1202" and is exposed outside the body 120 "to facilitate the coupling with the first locking member 1181". Preferably, the first locking member 1181 "is capable of moving axially between a first position and a second position, see fig. 26, when the first locking member 1181" is in the lower first position, the first locking member 1181 "is mated with the second locking member 1182", that is, the locking mechanism 118 "is in a locked state, and the input assembly 121" is locked circumferentially; referring to fig. 27, when the first locking member 1181 "moves upward and is located at the upper second position, the first locking member 1181" is separated from the second locking member 1182 ", that is, the locking mechanism 118" is in an unlocked state, the locking mechanism 118 "releases the circumferential locking of the input assembly 121", and the input assembly 121 "can rotate relative to the housing 110". In this embodiment, the operating member 1190 "is further included for operating the locking mechanism 118" to enable the first locking member 1181 "to move between the first position and the second position, and the operating member 1190" can be switched between an open state and a closed state, referring to fig. 26, when the operating member 1190 "is in the closed state, the operating member 1190" axially abuts downward against the first locking member 1181 ", and the first locking member 1181" axially abuts downward against the first elastic element 1905 ", so that the first locking member 1181" is located at the first position below, and the input assembly 121 "is circumferentially locked; referring to FIG. 27, when the operating member 1190 "is in the open state, the first locking member 1181" is moved axially upward to the second position by the first resilient element 1905 ", and the locking mechanism 118" releases the circumferential lock on the input member 121 ". Unlike the previous embodiments, the operation member 1190 "in this embodiment cannot drive the first connection member 114" to move, and for the movement of the first connection member 114 "of the threaded rod after the circumferential locking of the input member 121", this embodiment is mainly implemented by the external tool 1000 "driving the motor 112" to rotate. Preferably, the upper end of the motor 112 "is provided with a flat square shaft segment 1121" fixedly connected to the motor 112 "and the flat square shaft segment is rotated by an external tool, so that the threaded rod 1140" is further rotated relative to the threaded hole 1220 ".

Fig. 28-29 show a sander 20 (hereinafter referred to as a fourth embodiment) according to another structure of the present invention, which includes a main body 21 and a sanding part 22, where the main body 21 includes a housing 210, a motor 212 disposed in the housing 210, and an output assembly 213 driven by the motor 212 to rotate. The sanding part 22 includes a body 220 and an input assembly 221 located in the body 220, wherein a sanding element (e.g., sandpaper) can be mounted on a side of the body 220 facing the surface to be processed, and the input assembly 221 can rotate relative to the body 220 under the driving of the output assembly 213 to drive the body 220 to work. In order to achieve the inseparable connection of the grinding section 22 and the main body section 21 along the motor axial direction, the main body section 21 further comprises a first connecting member 214, and the grinding section 22 comprises a second connecting member 222 matched with the first connecting member 214, wherein the first connecting member 214 can rotate together with the second connecting member 222 under the driving of the motor 212. Preferably, in order to ensure that the first connection member 214 and the second connection member 222 are reliably and stably connected, the first connection member 214 and the second connection member 222 are connected by means of a threaded connection. In the present embodiment, the output assembly 213 includes an output shaft 2135 fixedly connected to the motor 212 and coaxially driven and rotated by the motor 212, and an output portion 2133 fixedly connected to the output shaft 2135. The input assembly 221 includes an input 2210 that mates with an output 2133. In this embodiment, the output shaft 2135 is a hollow shaft axially penetrating through the motor 212, and like the first and second embodiments, the first connecting member 214 is provided with an external thread at one end close to the input assembly 221, and the first connecting member 214 is at least partially arranged in the hollow shaft. The present embodiment further includes a locking structure for locking the input assembly 221, and the locking mechanism 218 includes a second locking member 2182 fixedly connected to the output shaft 2135 and a first locking member 2181 disposed in the housing 210 and capable of moving axially but not rotating. Basically, the first locking element 2181 is a locking block provided with a flat square hole or other special-shaped hole, and the second locking element 1182 is a flat square shaft section with an outer peripheral shape corresponding to the flat square hole or other special-shaped hole, and the principle of this part is described in the first embodiment and will not be described again here. The sander 20 of this embodiment further includes an operation member mechanism 219, and the operation and working principle of the operation member mechanism 219 are substantially the same as those of the first and second embodiments, and will not be described again here.

Fig. 30-31 show a sander 30 (hereinafter referred to as the fifth embodiment) according to another structure of the present invention, which includes a main body 31 and a sanding part 32, where the main body 31 includes a housing 310, a motor 312 located in the housing 310, and an output assembly 313 driven by the motor 312 to rotate. The polishing portion 32 includes a body 320 and an input assembly 321 disposed in the body 320, wherein a side of the body 320 facing the surface to be processed can be mounted with a polishing element (e.g., sandpaper), and the input assembly 321 can rotate relative to the body 320 under the driving of the output assembly 313 to drive the body 320 to work. In order to achieve the inseparable connection of the grinding section 32 and the body section 31 along the motor axial direction, the body section 31 further comprises a first connecting member 314, and the input assembly 321 comprises a second connecting member 322 engaged with the first connecting member 314, wherein the first connecting member 314 can rotate together with the second connecting member 322 under the driving of the motor 312. It should be noted that the second connecting member 322 of the present embodiment is not fixedly disposed with other elements of the input assembly, i.e., it is not fixedly disposed with the eccentric element in the input assembly 321, and the second connecting member 322 is capable of rotating relative to the eccentric element. That is, the second connecting member 322 is an operable connecting member in this embodiment, the operator can only operate the second connecting member 322 from below the grinding portion 32 after peeling off the sandpaper, and preferably, in order to ensure that the first connecting member 314 and the second connecting member 322 are connected reliably and stably, the first connecting member 314 and the second connecting member 322 are connected by means of screw threads. Preferably, an external thread 3140 is disposed at one end of the first connecting member 314 close to the input assembly 321, a concave threaded hole 3141 is disposed at one end of the first connecting member 314 close to the second connecting member, and the second connecting member 322 is a screw 3220 connected with the threaded hole 3141. In this embodiment, the output assembly 313 includes an output shaft 3135 fixedly connected to the motor 312 and coaxially driven by the motor 312, the output shaft 3135 is fixedly connected to the first connector 314, and the first connector 314 fixes the input assembly 321 and the first connector 314 via a screw 3220, so that the output shaft 3135 transmits the torque to the input assembly 321.

In this embodiment, the output assembly 313 may further include an output portion 3133 fixedly connected to the output shaft 3135, and the input assembly 312 includes an input portion 3210 cooperating with the output portion 3133. It will be appreciated that when the output member 313 does not include the output portion 3133 and/or the input member 321 does not include the input portion 3210, the input member 321 may rotate together under the action of the screw 3220 when the screw 3220 is tightened, thereby causing the body 320 to move therewith, and therefore, the body 320 may interfere with a tool extending into the screw 3220 from the lower opening 3203 of the body.

Further, since the screw 3220 has a small diameter of the screw thread, reliability and durability in torque transmission are low, and the output portion 3133 and the input portion 3210 described above can ensure reliability in torque transmission.

Fig. 32-33 show another configuration of a sander 40 of the present invention, which includes a body 41 and a sanding section 42, where the body 41 includes a housing 410, a motor 412 located in the housing 410, and an output member 413 driven by the motor 412 to rotate. The polishing portion 42 includes a body 420 and an input assembly 421 disposed in the body 420, wherein a polishing element (e.g., sand paper) can be mounted on a side of the body 420 facing the surface to be processed, and the input assembly 421 can rotate relative to the body 420 under the driving of the output assembly 413 to drive the body 420 to work. In order to achieve the inseparable connection of the grinding section 42 and the body section 41 along the axial direction of the motor 412, the body section 41 further comprises a first connecting member 414, and the input assembly 421 comprises a second connecting member 422 engaged with the first connecting member 414, wherein the first connecting member 414 can rotate together with the second connecting member 422 under the driving of the motor 412. Preferably, in order to ensure that the first connection member 414 and the second connection member 422 are reliably and stably connected, the first connection member 414 and the second connection member 422 are connected by means of a threaded connection. Preferably, an external thread 4140 is disposed at an end of the first connecting member 414 close to the second connecting member 422, the second connecting member 422 is disposed as a mounting hole, and an internal thread 4220 matched with the external thread 4140 is disposed in the mounting hole, in this embodiment, the output assembly 413 includes a first driving wheel 4131 fixedly connected to the motor 412 and coaxially driven by the motor 412, a second driving wheel 4132 driven by the first driving wheel 4131 to rotate, and an output shaft 4135 fixedly connected to the second driving wheel 4132 and coaxially driven by the second driving wheel 4132, in this embodiment, the output shaft 4135 is fixedly connected to or integrated with the first connecting member 414 to transmit the output torque to the first connecting member 414, the first connecting member 414 further transmits the torque to the input assembly 421 provided with the internal thread 4220 through a thread structure to drive the input assembly 421 to rotate, that is the same as in the third embodiment, the threaded rod 4140 and the mounting hole both achieve the axial connection between the main body 41 and the polishing portion 42 and achieve the axial connection between the main body 41 and the polishing portion 42 41 and a sanding portion 42. In addition, the present embodiment further provides another operating mechanism 419 for rotating the first connecting element 414, wherein the operating mechanism includes an operating member 4190, a second resilient member 4191 and a pivot 4192, and the operating member 4190 can be connected to or disconnected from the first connecting element 414 by rotating the operating member 4190 around the pivot 4192. Fig. 32 shows a state in which the operation member 4190 is disconnected from the first connector 414, and fig. 33 shows a state in which the operation member 4190 is connected to the first connector 414.

It should be noted that, in the present embodiment, the rotation of the first connecting member 414 relative to the second connecting member 422 also requires a corresponding locking mechanism, and fig. 32 and 33 of the present embodiment do not show the locking mechanism, and the arrangement of the locking mechanism may be set by referring to the arrangement manner of the other embodiments described above. In addition, the first connecting piece or the second connecting piece can be locked in all the embodiments of the invention in other manners, such as by forming a slot hole on the shell or the body and inserting the slot hole of the external stop element into the slot hole, so as to realize circumferential locking of the first connecting piece or the second connecting piece. The present invention is not limited to the embodiments described in the foregoing embodiments, and the structures between the different embodiments can be combined with each other, and those skilled in the art can make other modifications within the spirit of the present invention, but the present invention is also within the scope of the present invention as long as the functions achieved by the present invention are the same or similar.

Claims (42)

1. An abrading tool comprising: the main body part comprises a shell, a motor arranged in the shell and an output assembly driven by the motor to rotate; and

a grinding section detachably connected to the main body section, the grinding section including a body and an input assembly that rotates relative to the body about a first axis of rotation;

the method is characterized in that: the output assembly comprises an output part, the main body part further comprises a first connecting piece movably arranged relative to the shell, the input assembly comprises an input part matched and connected with the output part, a second connecting piece and an eccentric element eccentrically arranged relative to the first rotating axis, the body is connected with the eccentric element, the first connecting piece can move relative to the second connecting piece in an operable mode to enable the first connecting piece and the second connecting piece to be matched and connected, and when the first connecting piece and the second connecting piece are matched and connected, the output part is matched and connected with the input part to transmit the rotating motion of the motor to the input assembly.

2. An abrasive tool as claimed in claim 1, wherein: when the first connecting piece and the second connecting piece are connected in a matching mode, the polishing portion is not separated from the main body portion along the axial direction.

3. An abrasive tool as claimed in claim 2, wherein: the sanding tool further includes a locking mechanism configured to secure the second connector relative to the housing.

4. An abrasive tool as claimed in claim 3, wherein: the locking mechanism comprises a first locking piece which is arranged in a non-rotatable mode relative to the shell and can move between a locking position and a releasing position, and a second locking piece which is arranged in a non-rotatable mode relative to the second connecting piece, when the locking mechanism is located at the locking position, the first locking piece is matched with the second locking piece, and the second connecting piece is fixed relative to the shell; when the first locking piece and the second locking piece are separated from each other when the first locking piece and the second locking piece are located at the releasing position, the second connecting piece can rotate relative to the shell.

5. An abrasive tool as claimed in claim 2, wherein: the first connecting piece comprises a first supporting portion, the second connecting piece comprises a second supporting portion used for being matched and connected with the first supporting portion, and the central axis of the first supporting portion and the first rotating axis are arranged in a collinear mode.

6. An abrasive tool as claimed in claim 2, wherein: the hollow shaft is arranged outside the first connecting piece and is fixedly arranged relative to the output assembly, a first supporting portion is arranged at one end, close to the polishing portion, of the hollow shaft, and the second connecting piece comprises a second supporting portion which is used for being matched and connected with the first supporting portion.

7. An abrasive tool as claimed in claim 6, wherein: the second supporting part is arranged to be a groove, and the outer diameter of the first supporting part is matched with the inner diameter of the groove.

8. An abrasive tool as claimed in claim 1, wherein: the input part comprises a plurality of second ratchets distributed around the circumference, and the output part comprises a plurality of first ratchets in meshing transmission with the second ratchets.

9. An abrasive tool as claimed in claim 1, wherein: the first connecting piece is provided with a first matching part, the second connecting piece comprises a second matching part used for being matched and connected with the first matching part, and the central axis of the first matching part and the first rotating axis are arranged in a collinear mode.

10. An abrasive tool as claimed in claim 1, wherein: the first connecting piece is provided with an external thread, the second connecting piece is arranged into a mounting hole, and an internal thread matched and connected with the external thread is arranged in the mounting hole.

11. An abrasive tool as claimed in claim 1, wherein: the central axis of the first link is disposed collinear with the first axis of rotation.

12. An abrasive tool as claimed in claim 1, wherein: the main body part comprises an elastic swinging foot which is fixedly arranged relative to the shell, and the polishing part is provided with a limiting foot which is matched and connected with the elastic swinging foot.

13. An abrasive tool as claimed in claim 1, wherein: the output assembly includes a first drive wheel driven by the motor and a second drive wheel driven by the first drive wheel with an axis of rotation parallel to and spaced from an axis of rotation of the second drive wheel.

14. An abrasive tool as claimed in claim 13, wherein: the grinding tool further comprises a second fan and a first fan, wherein the second fan is fixedly arranged relative to the second driving wheel, and the first fan is coaxially arranged with the motor and is positioned at one end, close to the grinding part, of the motor.

15. An abrasive tool as claimed in claim 14, wherein: the shell is provided with at least one air inlet and at least one air outlet, the air inlet is located at one end, away from the polishing part, of the motor, the air outlet is arranged close to the second fan, and external air flows flow through the motor after entering the shell from the air inlet under the action of the first fan and flows out from the air outlet under the action of the second fan.

16. An abrading tool body portion for connection with an abrading portion of a detachable abrading tool, the body portion comprising:

a housing;

a motor housed in the housing for providing a rotational power;

an output assembly having an output portion, rotatable relative to the housing under drive of the motor;

the method is characterized in that: the main body part further comprises a first connecting piece movably arranged on the shell, the first connecting piece is operatively used for being matched and connected with the second connecting piece of the polishing part, and when the first connecting piece is matched and connected with the second connecting piece of the polishing part, the output part is matched and connected with the polishing part so as to transmit the rotation motion of the motor to the polishing part.

17. The body portion of claim 16, wherein: the first connecting piece comprises a first matching and connecting part, and external threads are arranged on the first matching and connecting part.

18. The body portion of claim 16, wherein: the main body part further comprises a hollow shaft sleeved on the first connecting piece, and the first connecting piece can move relative to the hollow shaft in an operable mode.

19. The body portion of claim 18, wherein: the output part is fixedly connected with the hollow shaft.

20. A body section as claimed in claim 19, wherein: the main body portion further includes a locking mechanism having a locked state, wherein the locking mechanism is capable of preventing rotation of the hollow shaft relative to the housing, and an unlocked state, wherein the hollow shaft is capable of rotating relative to the housing.

21. A body portion as claimed in claim 20, wherein: the main body further includes an operating mechanism including an operating element capable of controlling switching of the lock mechanism between the locked state and the unlocked state.

22. A body portion as claimed in claim 21, wherein: the operating member can be switched between a first position and a second position, wherein the operating member at least partially extends out of the housing when the operating member is located at the first position, and the operating member does not exceed the outer contour of the housing when the operating member is located at the second position.

23. A body portion as claimed in claim 22, wherein: when the operating piece is switched to the first position, the locking mechanism is switched to the locking state, and when the operating piece is switched to the second position, the locking mechanism is switched to the unlocking state.

24. A body portion as claimed in claim 23, wherein: the locking mechanism comprises a first locking piece fixedly arranged relative to the hollow shaft, a second locking piece movably arranged relative to the shell, and a first elastic piece positioned between the shell and the second locking piece; when the operating part is located at the first position, the first elastic part is in a release state, and the first locking part and the second locking part are mutually matched and connected; when the operating piece is located at the second position, the operating piece abuts against the second locking piece to enable the first elastic piece to be in a compressed state, and the first locking piece and the second locking piece are separated from each other.

25. A body portion as claimed in claim 24, wherein: the first connecting piece comprises a transmission element, and the operating piece can be used for operatively driving the first connecting piece to move through the transmission element.

26. A body section as claimed in claim 25, wherein: the operating mechanism further comprises a base which can rotate around a second rotation axis relative to the shell, the operating piece can pivot between a first operating position and a second operating position relative to the base, when the operating piece is located at the first operating position, the operating piece is separated from the transmission element, and when the operating piece is located at the second operating position, the operating piece is matched with the transmission element, so that the first connecting piece can be driven to rotate around the second rotation axis.

27. The body portion of claim 16, wherein: the output portion is rotatable about a third axis of rotation, the output portion including a plurality of ratchet teeth circumferentially distributed about the third axis of rotation.

28. A body portion as claimed in claim 27, wherein: the third axis of rotation is parallel to and spaced from the axis of the motor.

29. A body portion as claimed in claim 28, wherein: and the shell is provided with a holding handle which extends at a certain angle with the axis of the motor, and the axis of the motor and the holding handle are respectively positioned at two opposite sides of the third rotation axis.

30. The body portion of claim 16, wherein: the output assembly comprises an output shaft, and the output shaft and the first connecting piece are coaxially arranged and fixedly connected.

31. The body portion of claim 16, wherein: the main body part further comprises two pairs of limiting feet which are arranged diagonally.

32. A grinding part of a grinding tool is detachably matched and connected with a main body part of the grinding tool,

the grinding part includes:

a body;

an input assembly at least partially housed in the body;

the method is characterized in that: the input assembly can rotate around a first rotation axis relative to the body, the input assembly comprises an input part and an eccentric element, the input part is used for transmitting torque, the eccentric element is arranged eccentrically relative to the first rotation axis, the body is connected with the eccentric element, the input assembly further comprises a second connecting piece, the second connecting piece is fixedly arranged relative to the eccentric element, and the second connecting piece can be matched and connected with the first connecting piece of the main body part under the operation of the main body part, so that the input part is matched and connected with the main body part to transmit the power of the main body part to the grinding part.

33. The sanding portion of claim 32, wherein: the body comprises a cover body sleeved on the outer side of the second connecting piece and a plate-shaped body which is axially fixed with the cover body and is positioned below the cover body, the plate-shaped body is used for installing a polishing element, and the second connecting piece comprises a second matching part and a second supporting part connected with the second matching part.

34. A sanding section as defined in claim 33, wherein: the second fitting portion is provided as a mounting hole extending in the rotation axis direction, the second support portion is provided as a groove extending in the rotation axis direction, and a lower end of the mounting hole is closer to the plate-like body than a lower end of the groove.

35. The sanding portion of claim 34, wherein: the second connector includes a mounting hole extending in the first rotational axis direction, the mounting hole having an internal thread.

36. The sanding portion of claim 35, wherein: the second connecting piece further comprises a groove extending along the direction of the first rotating axis, the groove is communicated with the mounting hole, and the outer diameter of the groove is larger than that of the mounting hole.

37. A sanding section as defined in any one of claims 34 or 36, wherein: the central axis of the groove and the central axis of the mounting hole are collinear with the first axis of rotation.

38. The sanding portion of claim 32, wherein: the input portion is fixedly disposed relative to the second connector.

39. A sanding section as defined in claim 38, wherein: the input portion includes a plurality of ratchet teeth circumferentially distributed about the first axis of rotation.

40. The sanding portion of claim 32, wherein: the input assembly further includes a weight, the central axis of the eccentric element being located on one side of the first axis of rotation, the weight being located on the other side of the first axis of rotation opposite the central axis.

41. The sanding portion of claim 40, wherein: the balance weight is located at one end of the eccentric element away from the input portion.

42. A grinding section as defined in claim 32, wherein: the body comprises a cover body sleeved on the outer side of the second connecting piece and a plate-shaped body axially fixed with the cover body, the plate-shaped body is used for mounting a polishing element, and the plate-shaped body can be arranged to be round, rectangular or irregular.

Images