EP4725645A1

EP4725645A1 - Polishing machine

Info

Publication number: EP4725645A1
Application number: EP24867280.0A
Authority: EP
Inventors: Guoming Tong; Xiang Zhao; Yangqing ZHANG; Jiayu LI
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2023-09-22
Filing date: 2024-09-02
Publication date: 2026-04-15
Also published as: CN119734176A; AU2024344149A1; WO2025060868A1

Abstract

The present application discloses a polishing machine, including: a housing, a motor, a main shaft, a mounting shaft, a limiting member, and a locking mechanism. The main shaft is drivably connected to a motor shaft of the motor, and the main shaft is rotatable relative to the housing around a first axis. The mounting shaft is detachably connected to the main shaft. Movement of the mounting shaft drives the locking mechanism, such that the locking mechanism allows the limiting member to move to limit movement of the mounting shaft in a direction of the first axis. The polishing machine, through providing the locking mechanism, enables a user to complete connection and locking of the mounting shaft and the main shaft through one operation, simplifies operation steps for installing a working head, and improves an efficiency of replacing the working head.

Description

This application claims priority to Chinese Patent Application No. CN 202311235069.8 filed on Sep. 22, 2023 , and Chinese Patent Application No. CN 202410588216.8 filed on May 11, 2024 , the disclosures of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The present application relates to a power tool, and specifically relates to a polishing machine.

BACKGROUND

A polishing machine in the related art is a power tool used for performing mechanical grinding, polishing, and waxing operations on parts. The polishing machine, also known as a grinder, is widely used in many fields such as automotive and construction.
The polishing machine includes a main engine, a working head, and a base plate, wherein the working head is connected to the main engine. Different working heads have different eccentric distances, and installing different working heads to the main engine can achieve different working trajectories or movement patterns. The base plate is connected to the working head, and the base plate is used to connect consumables such as polishing paper, and the base plate is replaceable. However, when an existing working head is installed to the main engine, a two-step operation by a user is required. A first step is to pull down an operating sleeve on the main engine to form a space for insertion of the working head. A second step is to insert the working head into the operating sleeve. The operation is cumbersome, not convenient enough, and has low efficiency.
This section provides background information related to the present application, which may not necessarily be prior art.

SUMMARY

This application adopts the following technical solution.
A polishing machine, including a housing; a motor; a main shaft drivably connected to a motor shaft of the motor, the main shaft being rotatable relative to the housing around a first axis; a mounting shaft detachably connected to the main shaft; and a limiting member and a locking mechanism, wherein a movement of the mounting shaft activates the locking mechanism, such that the locking mechanism allows the limiting member to move to restrict the mounting shaft's motion along the first axis.
In one example, a limiting groove is formed on the mounting shaft, and during a process of the mounting shaft being connected to the main shaft from bottom to top, the limiting member falls into the limiting groove to lock the mounting shaft in place.
In one example, the locking mechanism includes a driving member and an operating sleeve movably sleeved on the main shaft, the operating sleeve being capable of driving the driving member to move, such that the limiting member disengages from the limiting groove.
In one example, the driving member is a first driving member, and the first driving member rotationally drives the limiting member to disengage from the limiting groove.
In one example, the driving member is a second driving member, and the second driving member translationally drives the limiting member to disengage from the limiting groove.
In one example, the second driving member is a ring sleeve structure sleeved on the main shaft, a relief groove is formed on an inner side of the second driving member, a connecting end of the main shaft is provided with a insertion hole for insertion of the mounting shaft along an axial direction, an accommodating portion is provided radially penetrating through the connecting end of the main shaft, and the limiting member has a relief position where the limiting member is pushed by the mounting shaft to enter the relief groove and a locking position where the limiting member is engaged in the limiting groove.
In one example, the second driving member includes a first retaining portion located on an upper side of the relief groove, the first retaining portion have an inclined surface on a side close to the relief groove, and a diameter of the first retaining portion is smaller than a diameter of the relief groove.
In one example, before the second driving member is driven by the operating sleeve, the first retaining portion abuts against an upper portion of the limiting member.
In one example, an accommodating portion is provided through a connecting end of the main shaft in a radial direction, and the limiting member is movably disposed within the accommodating portion; the polishing machine further includes a limiting sleeve, the limiting sleeve is movably sleeved on the main shaft, and a top of the limiting sleeve forms a limiting portion that limits the limiting member within the accommodating portion; the limiting member has an initial position where the limiting member is limited within the accommodating portion, a relief position where the limiting member is pressed by the mounting shaft to move past the limiting portion to an upper side of the limiting portion, and a locking position where the limiting member is engaged between the limiting portion and the limiting groove.
In one example, the polishing machine further includes a pivoting pressing plate and an elastic member, the pivoting pressing plate is located such that two ends of a pivot shaft of the pivoting pressing plate respectively pressed against a top of the limiting member and a top of the limiting sleeve and form a seesaw structure, and the elastic member has a movement tendency to reset the limiting portion to limit the limiting member within the accommodating portion.
In one example, the first driving member includes a pivoting lifting plate, the operating sleeve is capable of driving the pivoting lifting plate to rotate, and rotation of the pivoting lifting plate drives the pivoting pressing plate to rotate in an opposite direction.
In one example, when the operating sleeve is operated, the mounting shaft is disengageable from the main shaft.
In one example, when the operating sleeve is moved in an up-down direction, the mounting shaft is disengageable from the main shaft.
In one example, the mounting shaft is connectable to an eccentric body, and a working attachment for performing a polishing operation is detachably connected on the eccentric body.
In one example, the polishing machine further including a reset assembly, a driving hole centered on the first axis is formed within the main shaft, the driving hole is for insertion of the mounting shaft, the reset assembly is disposed within the driving hole and located at an upper end of the mounting shaft, the reset assembly includes an elastic member and a return block, and the elastic member provides an elastic force for downward movement of the return block.
A power tool, including: a housing; a motor; a main shaft drivably connected to a motor shaft of the motor and rotatable relative to the housing around a first axis; a mounting shaft detachably connected to the main shaft, and a working attachment is attached to a bottom of the mounting shaft; a limiting member located at a first position or a second position, when the mounting shaft is mounted to the main shaft, the limiting member is located at the first position to restrict movement of the mounting shaft along the first axis; and when the limiting member is at the second position, the limiting member allows the mounting shaft to disengage from the main shaft; and a locking mechanism configured to drive the limiting member to move from the second position to the first position; wherein a movement of the mounting shaft activates the locking mechanism such that the limiting member is allowable to move to the second position.
In one example, a limiting groove is formed on the mounting shaft, and during a process of the mounting shaft being connected with the main shaft from bottom to top, the limiting member falls into the limiting groove to lock the mounting shaft in place.
In one example, the locking mechanism includes a driving member and an operating sleeve movably sleeved on the main shaft, the operating sleeve is capable of driving the driving member to move, such that the limiting member disengages from the limiting groove, and the driving member translationally drives the limiting member to disengage from the limiting groove.
In one example, the power tool further including a reset assembly, a driving hole centered on the first axis is formed within the main shaft, the driving hole is for insertion of the mounting shaft, the reset assembly is disposed within the driving hole and located at an upper end of the mounting shaft, and the reset assembly is configured to keep the limiting member at the second position when the mounting shaft disengages from the main shaft.
In one example, the reset assembly includes an elastic member and a return block, and the elastic member provides an elastic force for downward movement of the return block.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a polishing machine;
FIG. 2 is an internal schematic diagram of the polishing machine;
FIG. 3 is a schematic diagram of the polishing machine with a housing removed;
FIG. 4 is a front view of the polishing machine;
FIG. 5 is a schematic diagram of a mounting shaft of the polishing machine;
FIG. 6 is a first state diagram during a connecting process of the mounting shaft and a main shaft of one embodiment of the polishing machine;
FIG. 7 is a second state diagram during the connecting process of the mounting shaft and the main shaft of one embodiment of the polishing machine;
FIG. 8 is a third state diagram during the connecting process of the mounting shaft and the main shaft of one embodiment of the polishing machine;
FIG. 9 is a state diagram during a separating process of the mounting shaft and the main shaft of one embodiment of the polishing machine;
FIG. 10 is a schematic diagram of a first driving member, a limiting sleeve, a pivoting pressing plate, and a limiting member of one embodiment of the polishing machine;
FIG. 11 is a schematic diagram of the main shaft, the first driving member, the limiting sleeve, the pivoting pressing plate, and the limiting member of one embodiment of the polishing machine;
FIG. 12 is a first state diagram during a connecting process of the mounting shaft and the main shaft of a second embodiment of the polishing machine;
FIG. 13 is a second state diagram during the connecting process of the mounting shaft and the main shaft of the second embodiment of the polishing machine;
FIG. 14 is a third state diagram during the connecting process of the mounting shaft and the main shaft of the second embodiment of the polishing machine;
FIG. 15 is a state diagram during a separating process of the mounting shaft and the main shaft of the second embodiment of the polishing machine;
FIG. 16 is a schematic diagram of an operating sleeve and the main shaft of the second embodiment of the polishing machine;
FIG. 17 is an exploded view of the operating sleeve, the limiting member, a support base, and the main shaft of the second embodiment of the polishing machine;
FIG. 18 is a sectional view of a second driving member of the second embodiment of the polishing machine;
FIG. 19 is a schematic diagram of a first structure of a working attachment and a working head;
FIG. 20 is an exploded view of the structure shown in FIG. 19;
FIG. 21 is a sectional view of the structure shown in FIG. 19;
FIG. 22 is a schematic diagram of a second structure of the working attachment and the working head;
FIG. 23 is an exploded view of the structure shown in FIG. 22;
FIG. 24 is a sectional view of the structure shown in FIG. 23;
FIG. 25 is a schematic diagram of a third embodiment of the polishing machine;
FIG. 26 is an internal schematic diagram of the third embodiment of the polishing machine;
FIG. 27 is a partial structural sectional view of the third embodiment of the polishing machine;
FIG. 28 is a sectional view when the limiting member in FIG. 27 is at a first position;
FIG. 29 is an enlarged view of portion A in FIG. 28;
FIG. 30 is a sectional view when the limiting member in FIG. 27 is at a second position;
FIG. 31 is an enlarged view of portion B in FIG. 30;
FIG. 32 is a sectional view when the mounting shaft is inserted into the main shaft but not locked in a fourth embodiment of the polishing machine;
FIG. 33 is a sectional view of a locked state of the mounting shaft and the main shaft in the fourth embodiment of the polishing machine;
FIG. 34 is a sectional view when the operating sleeve is operated in the fourth embodiment of the polishing machine;
FIG. 35 is a sectional view when the main shaft is ejected by the limiting member in the fourth embodiment of the polishing machine;
FIG. 36 is an exploded schematic diagram of a partial structure of the fourth embodiment of the polishing machine;
FIG. 37 is an exploded schematic diagram when the limiting member and the main shaft are assembled in the fourth embodiment of the polishing machine;

DETAILED DESCRIPTION

Before any examples of this application are explained in detail, it is to be understood that this application is not limited to its application to the structural details and the arrangement of components set forth in the following description or illustrated in the above drawings.
In this application, the terms "comprising", "including", "having" or any other variation thereof are intended to cover an inclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those series of elements, but also other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or device comprising that element.
In this application, the term "and/or" is a kind of association relationship describing the relationship between associated objects, which means that there can be three kinds of relationships. For example, A and/or B can indicate that A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the contextual associated objects belong to an "and/or" relationship.
In this application, the terms "connection", "combination", "coupling" and "installation" may be direct connection, combination, coupling or installation, and may also be indirect connection, combination, coupling or installation. Among them, for example, direct connection means that two members or assemblies are connected together without intermediaries, and indirect connection means that two members or assemblies are respectively connected with at least one intermediate members and the two members or assemblies are connected by the at least one intermediate members. In addition, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.
In this application, it is to be understood by those skilled in the art that a relative term (such as "about", "approximately", and "substantially") used in conjunction with quantity or condition includes a stated value and has a meaning dictated by the context. For example, the relative term includes at least a degree of error associated with the measurement of a particular value, a tolerance caused by manufacturing, assembly, and use associated with the particular value, and the like. Such relative term should also be considered as disclosing the range defined by the absolute values of the two endpoints. The relative term may refer to plus or minus of a certain percentage (such as 1%, 5%, 10%, or more) of an indicated value. A value that did not use the relative term should also be disclosed as a particular value with a tolerance. In addition, "substantially" when expressing a relative angular position relationship (for example, substantially parallel, substantially perpendicular), may refer to adding or subtracting a certain degree (such as 1 degree, 5 degrees, 10 degrees or more) to the indicated angle.
In this application, those skilled in the art will understand that a function performed by an assembly may be performed by one assembly, multiple assemblies, one member, or multiple members. Likewise, a function performed by a member may be performed by one member, an assembly, or a combination of members.
In this application, the terms "up", "down", "left", "right", "front", and "rear" and other directional words are described based on the orientation or positional relationship shown in the drawings, and should not be understood as limitations to the examples of this application. In addition, in this context, it also needs to be understood that when it is mentioned that an element is connected "above" or "under" another element, it can not only be directly connected "above" or "under" the other element, but can also be indirectly connected "above" or "under" the other element through an intermediate element. It should also be understood that orientation words such as upper side, lower side, left side, right side, front side, and rear side do not only represent perfect orientations, but can also be understood as lateral orientations. For example, lower side may include directly below, bottom left, bottom right, front bottom, and rear bottom.
The technical solutions involved in the present application are applied to power tools, and Embodiment 1 to Embodiment 4 are described using a polishing machine as an example. It should be noted that all technical solutions provided by the present application, in addition to being applicable to polishing machines, can also be applied to other types of power tools such as angle grinders, angle drills, electric drills, and screwdrivers.
As shown in FIGS. 1 to 4, the present application provides a polishing machine 10. The polishing machine 10 can be replaced with different working heads 400 and working attachments 900. Different working heads 400 and working attachments 900 can perform different operations on mechanical components, such as grinding and polishing operations. That is to say, the working attachment 900 may be a polishing attachment, a grinding attachment, a cutting attachment, or the like. In addition to the polishing machine 10, the technical solutions involved in the present application can also be applied to other angular power tools, such as angle grinders, angle drills, and angular wrenches.
Specifically, the polishing machine 10 includes a housing 100, a motor 200, a main shaft 300, a working head 400, a limiting member 500, and a locking mechanism 600. The housing 100 is a main installation component. An installation space is formed within the housing 100, and both the motor 200 and the main shaft 300 are disposed within the installation space. The motor 200 is a power component of the polishing machine 10. The main shaft 300 is drivably connected to a motor shaft of the motor 200. Under driving of the motor 200, the main shaft 300 is rotatable relative to the housing 100 around a first axis 101. The first axis 101 is a line shown as a dashed line in FIG. 3. The working head 400 includes a mounting shaft 410. The mounting shaft 410 can directly or indirectly mount the working attachment 900 and drive the working attachment 900 to rotate. The mounting shaft 410 is detachably connected to the main shaft 300, and rotation of the main shaft 300 drives rotation of the mounting shaft 410. The locking mechanism 600 and the limiting member 500 work together to achieve locking or unlocking of the mounting shaft 410 and the main shaft 300.
As shown in FIG. 1, the housing 100 has a split structure including a first half shell 110 and a second half shell 120 spliced together. The housing 100 with a split structure is easy to manufacture and assemble. The housing 100 is formed with a grip portion 130 and a mounting portion 140. The grip portion 130 is for gripping by a user. A user can operate the polishing machine 10 by gripping the grip portion 130 formed on the housing 100. The main shaft 300 is mounted within the mounting portion 140.
In some examples, a central axis of the mounting portion 140 and a central axis of the grip portion 130 are disposed at an angle. The motor 200 is mounted within an installation space corresponding to the grip portion 130. The main shaft 300 is mounted within an installation space corresponding to the mounting portion 140. A motor shaft of the motor 200 and the main shaft 300 are disposed at an angle. In one specific example, the motor shaft of the motor 200 and the main shaft 300 are disposed perpendicularly. When a user grips the polishing machine 10, the motor shaft of the motor 200 extends in a horizontal direction, the first axis 101 extends in a vertical direction, and the mounting portion 140 is formed with a downward opening.
Continuing to refer to FIGS. 1 to 15, the polishing machine 10 includes a limiting member 500. The limiting member 500 can limit movement of the mounting shaft 410 along the first axis 101. The limiting member 500 can be located at least at a first position and a second position. When the mounting shaft 410 is mounted to the main shaft 300 and is in a locked state, the limiting member 500 is at the first position. When the limiting member 500 is at the second position, the limiting member 500 allows the mounting shaft 410 to move along the first axis 101 to disengage from the main shaft 300. In the drawings, the limiting member 500 in FIGS. 6, 8, 12, and 14 is at the first position, and the limiting member 500 in FIGS. 7, 9, 11, and 13 is at the second position.
The polishing machine 10 further includes a locking mechanism 600. The locking mechanism 600 is disposed around the main shaft 300. During the connection of the mounting shaft 410 with the main shaft 300, the mounting shaft 410 activates the limiting member 500 and causes the limiting member 500 to move and directly lock. The locking mechanism 600 provides a space for the limiting member 500 to move. When the mounting shaft 410 is mounted to the main shaft 300, the locking mechanism 600 locks the limiting member 500 such that the limiting member 500 cannot move so that the mounting shaft 410 disengages from the main shaft 300. That is to say, except for the mounting shaft 410 directly contacting with the main shaft 300 to activate the limiting member 500 for locking, no additional operation is required to achieve a locking function. The use of the locking mechanism 600 can achieve a stable connection between the working head 400 and the main shaft 300, enabling the working head 400 to rotate synchronously with the main shaft 300. That is to say, the locking mechanism 600 and the limiting member 500 together achieve torque transmission between the mounting shaft 410 and the main shaft 300.
FIGS. 6 to 11 disclose a first embodiment of the polishing machine 10.
In the present embodiment, a limiting groove 411 is formed on the mounting shaft 410. During a process of the mounting shaft 410 being connected with the main shaft 300 from bottom to top, the limiting member 500 falls into the limiting groove 411 to lock a position of the mounting shaft 410. In some examples, the limiting member 500 is a limiting ball, the limiting groove 411 is an arc groove capable of limiting a portion of a sphere of the ball, and the limiting ball may be a steel ball or other metal ball with a high hardness. In some examples, a plurality of the limiting members 500 are provided. A plurality of the limiting members 500 are disposed at intervals around a circumference of the mounting shaft 410. Correspondingly, a plurality of the limiting grooves 411 are provided. A plurality of the limiting grooves 411 are arranged in an arc on the mounting shaft 410, and the plurality of the limiting members 500 can engage into the plurality of the limiting grooves 411 in a one-to-one correspondence.
To insert the mounting shaft 410 and mount the limiting member 500, an insertion hole for insertion of the mounting shaft 410 is provided along an axial direction at a connecting end of the main shaft 300, and an accommodating portion 301 is provided through the connecting end of the main shaft 300 in a radial direction. The accommodating portion 301 is used to mount the limiting member 500. In some examples, the accommodating portion 301 is an accommodating hole that penetrates a side wall of the main shaft 300 and communicates with the insertion hole. The limiting member 500 has an initial position where a portion protrudes into an insertion hole 421 to block the mounting shaft 410, and the limiting member 500 can move outward within the accommodating hole under an external force, enabling the limiting member 500 to move to a relief position that avoids the mounting shaft 410.
It should be noted that during a process of the mounting shaft 410 being inserted into the insertion hole of the main shaft 300 from bottom to top, the mounting shaft 410 gradually approaches the limiting member 500. After the mounting shaft 410 contacts the limiting member 500, the mounting shaft 410 may push the limiting member 500 so that the limiting member 500 move into the accommodating hole, thereby enabling the mounting shaft 410 to continue moving through the limiting member 500. When the limiting groove 411 moves to a position directly opposite the limiting member 500, the limiting member 500 can fall into the limiting groove 411 and be limited within the limiting groove 411, thereby achieving locking of the mounting shaft 410.
To enable the limiting member 500 to fall into the limiting groove 411 to lock the mounting shaft 410, in some exampleexamples, as shown in FIGS. 6 to 11, the polishing machine 10 further includes a pivoting pressing plate 614, a limiting sleeve 800, and an elastic member 810. The limiting sleeve 800 is movably fitted over the main shaft 300. A top of the limiting sleeve 800 forms a limiting portion that limits the limiting member 500 in the accommodating portion 301. The pivoting pressing plate 614 is located such that two ends of a pivot shaft of the pivoting pressing plate 614 respectively press against a top of the limiting member 500 and a top of the limiting sleeve 800 to form a seesaw structure. The elastic member 810 has a movement tendency to reset the limiting portion to a position that limits the limiting member 500 in the accommodating portion 301. And the limiting member 500 has an initial position where the limiting member 500 is limited within the accommodating portion 301, a relief position where the limiting member 500 is pushed by the mounting shaft 410 to leave the limiting portion and move to an upper side of the limiting portion, and a locking position where the limiting member 500 is engaged between the limiting portion and the limiting groove 411.
As shown in FIG. 6, an extension length of the accommodating hole in a direction parallel to the first axis 101 is greater than a radial dimension of the limiting member 500 in the direction parallel to the first axis 101, enabling the limiting member 500 to not only move in an axial direction of the accommodating hole, but also move in a radial direction of the accommodating hole.
A middle portion of the pivoting pressing plate 614 is provided with a first pivot shaft hole. A first pivot shaft passes through the first pivot shaft hole to rotatably connect the pivoting pressing plate 614 on an inner wall of the accommodating hole. The pivoting pressing plate 614 includes a first portion and a second portion located on two sides of the pivot shaft. The pivoting pressing plate 614 is located above the limiting member 500, and in an insertion direction of the mounting shaft 410, the first portion of the pivoting pressing plate 614 abuts against a top of the limiting member.
When the limiting member 500 moves in the insertion direction under a pushing action of the mounting shaft 410, the limiting member 500 can lift the first portion, causing the pivoting pressing plate 614 to rotate around the first pivot shaft in a counterclockwise direction as shown in FIG. 7. The counterclockwise direction is defined as a positive direction of rotation of the pivoting pressing plate 614. In some examples, a number of the pivoting pressing plates 614 is a plurality, and the plurality of the pivoting pressing plates 614 are disposed in one-to-one correspondence with the plurality of the limiting members 500.
When the pivoting pressing plate 614 rotates positively around the first pivot shaft, because the second portion of the pivoting pressing plate 614 presses against a top of the limiting sleeve 800 in the insertion direction of the mounting shaft 410, the limiting sleeve 800 can be pressed by the second portion to move in a direction away from the insertion direction, thereby causing the limiting portion of the limiting sleeve 800 to synchronously move downward. The upward moving limiting member 500 and the downward moving limiting portion are misaligned, and the limiting member 500 is pushed above the limiting portion under the pushing action of the mounting shaft 410. And because the downward moving limiting sleeve 800 can synchronously compress the elastic member 810, the elastic member 810 compresses to accumulate elastic potential energy. When the mounting shaft 410 moves to a position where the limiting groove 411 of the mounting shaft 410 is directly opposite the limiting member 500, the mounting shaft 410 releases pushing on the limiting member 500, and the elastic member 810 releases elastic potential energy to cause the limiting sleeve 800 to reset to an initial position. During a reset process, the limiting sleeve 800 can drive the pivoting pressing plate 614 to reset, and cause the limiting member 500 to be engaged in a locking position between the limiting portion and the limiting groove 411 as shown in FIG. 8.
To achieve unlocking of the mounting shaft 410 and the main shaft 300, enabling the working head 400 to be detached from the main shaft 300 for storage or replacement with other working heads 400, continuing to refer to FIG. 9, the locking mechanism 600 further includes a driving member and an operating sleeve 700 movably fitted over the main shaft 300. An operating driving portion 710 is disposed on the operating sleeve 700. The operating driving portion 710 can cause the driving member to move, thereby causing the limiting member 500 to disengage from the limiting groove 411. In the present example, the operating driving portion 710 is a part of the operating sleeve 700. In one example, the operating driving portion 710 may be molded separately from the operating sleeve 700 and then assembled together for use. In one example, a transmission structure may also be disposed between the operating driving portion 710 and the operating sleeve 700 to transmit a force, which is not limited here.
In some examples, the operating sleeve 700 is directly operated to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the operating sleeve 700 may also be indirectly operated through other components, thereby enabling the mounting shaft 410 to be removed from the main shaft 300.
In some more specific examples, the operating sleeve 700 is moved in an up-down direction to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the mounting shaft 410 may also be removed from the main shaft 300 by rotating the operating sleeve 700.
In some examples, the driving member is a first driving member 610, and the first driving member 610 rotationally drives the limiting member 500 to disengage from the limiting groove 411. The first driving member 610 includes a pivoting lifting plate 611. The operating sleeve 700 can drive the pivoting lifting plate 611 to rotate, and the rotating pivoting lifting plate 611 drives the pivoting pressing plate 614 to rotate in an opposite direction.
Continuing to refer to FIGS. 10 and 11, the first driving member 610 further includes two mounting plates 612 and a second pivot shaft 613. A limiting groove is formed on an inner wall surface of the operating sleeve 700. One end of the pivoting lifting plate 611 is disposed within the limiting groove, and another end of the pivoting lifting plate 611 presses against a limiting protrusion 801 formed on an outer wall surface of the limiting sleeve 800 from top to bottom. The two mounting plates 612 are mounted at a middle portion of the pivoting lifting plate 611 and are located on two sides of the mounting plates 612 disposed opposite to each other. Each mounting plate 612 is provided with a second pivot shaft hole. The second pivot shaft 613 passes through the two second pivot shaft holes and is connected within the housing 100.
As shown in FIG. 9, when a force is applied from bottom to top to move the operating sleeve 700 upward, one end of the pivoting lifting plate 611 that abuts against the operating sleeve 700 moves upward, causing the pivoting lifting plate 611 to rotate clockwise, and causing another end of the pivoting lifting plate 611 to push the limiting sleeve 800 downward by pressing against the limiting protrusion 801. During downward movement of the limiting sleeve 800, the elastic member 810 can be synchronously compressed, and the limiting portion of the limiting sleeve 800 synchronously moves downward to release pressing on the limiting member 500. At this time, by applying an external force downward on the mounting shaft 410, the mounting shaft 410 can push the limiting member 500 to move into a limiting hole, enabling the mounting shaft 410 to smoothly disengage from the main shaft 300. After stopping applying the external force to the operating sleeve 700, the elastic member 810 releases elastic potential energy, causing the limiting member 500, the limiting sleeve 800, the first driving member 610, and the operating sleeve 700 to reset to initial positions.
In some examples, the pivoting lifting plate 611 includes a first arc plate 6111 and a second arc plate 6112 connected to each other. The first arc plate 6111 is generally Z-shaped, and the second arc plate 6112 is generally semicircular. One end of the first arc plate 6111 is connected at a middle portion of the second arc plate 6112, and another end presses within the limiting groove. The limiting protrusion 801 is a ring protrusion, and the second arc plate 6112 is fitted over the limiting sleeve 800 and presses against the ring protrusion.
In some examples, a number of the first driving members 610 is two or more. A plurality of the first driving members 610 are disposed around a circumference of the limiting sleeve 800, and a plurality of the second arc plates 6112 simultaneously press against different positions of the ring protrusion.
FIGS. 12 to 18 disclose a second embodiment of the polishing machine 10.
Referring to FIGS. 12 to 18, to enable the limiting member 500 to fall into the limiting groove 411 to lock the mounting shaft 410, the driving member is a second driving member 620. The second driving member 620 achieves limiting of the limiting member 500, and the second driving member 620 translationally drives the limiting member 500 to disengage from the limiting groove 411.
As shown in FIG. 18, the second driving member 620 is a ring sleeve structure fitted over the main shaft 300. A relief groove 621 is formed on an inner side of the second driving member 620. The limiting member 500 has an initial position where the limiting member 500 is limited within the accommodating portion 301, a relief position where the limiting member 500 is pushed by the mounting shaft 410 to enter the relief groove 621, and a locking position where the limiting member 500 is engaged within the limiting groove 411.
Specifically, the second driving member 620 includes a first retaining portion 622 located on an upper side of the relief groove 621, a second retaining portion located on a lower side of the relief groove 621, and a third retaining portion located on an outer side of the relief groove 621. The first retaining portion 622 forms an inclined surface 623 on a side close to the relief groove 621. A diameter of the first retaining portion 622 is smaller than a diameter of the relief groove 621. Specifically, before the second driving member 620 is driven by the operating sleeve 700, the first retaining portion 622 abuts against an upper portion of the limiting member 500. In a direction from inside to outside of the second driving member 620, the inclined surface 623 slopes outward from top to bottom. The limiting member 500 can lift the second driving member 620 by moving on the inclined surface 623 and cause the limiting member 500 to enter the relief groove 621.
Continuing to refer to FIG. 17, the polishing machine 10 further includes an elastic return member 302 fitted over the main shaft 300. One end of the elastic return member 302 is fixedly disposed relative to the main shaft 300, and another end abuts against a top surface of the second driving member 620. During upward movement of the second driving member 620, the elastic return member 302 is compressed to accumulate elastic potential energy. When the limiting groove 411 on the mounting shaft 410 moves to a position directly opposite the limiting member 500, the elastic return member 302 releases elastic potential energy, causing the limiting member 500 to move in a direction of the limiting groove 411, ultimately causing the limiting member 500 to engage at a locking position between the limiting groove 411 and the first retaining portion 622.
To achieve unlocking of the mounting shaft 410 and the main shaft 300, enabling the working head 400 to be detached from the main shaft 300 for storage or replacement with other working heads 400, continuing to refer to FIG. 17, the polishing machine 10 further includes an operating sleeve 700 movably fitted over the main shaft 300. The operating sleeve 700 can drive the second driving member 620 to move, causing the limiting member 500 to disengage from the limiting groove 411.
In the related art, installing a working head requires at least a two-step operation. A user performs an operation on an operating sleeve (such as moving), the operating sleeve drives a locking mechanism to move, causing the locking mechanism to leave a space for the limiting member to move. Then the mounting shaft is extended into the main shaft to a specific position, and locking can only be achieved after releasing the operating sleeve.
In the polishing machine 10 provided by the present application, movement of the mounting shaft 410 drives the locking mechanism 600 to cause the locking mechanism 600 to allow the limiting member 500 to move from the first position to the second position. When the limiting member 500 moves to the limiting groove 411, a state change of the locking mechanism 600 locks the limiting member 500 in the limiting groove 411, thereby locking the mounting shaft 410 with the main shaft 300. That is to say, movement of the mounting shaft 410 alone can trigger the limiting member 500 to move from the first position to the second position. Therefore, a solution disclosed by the present application enables a user to complete connecting and locking of the mounting shaft 410 and the main shaft 300 with only one operation. Compared to a two-step operation, a one-step operation to complete assembly of the working head 400 simplifies operation steps for installing the working head 400 and improves an efficiency of replacing the working head 400.
In some specific examples, the operating sleeve 700 is directly operated to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the operating sleeve 700 may also be indirectly operated through other components, thereby enabling the mounting shaft 410 to be removed from the main shaft 300.
In some more specific examples, the operating sleeve 700 is moved in an up-down direction to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the mounting shaft 410 may also be removed from the main shaft 300 by rotating the operating sleeve 700.
Specifically, an abutting plate 624 is protruded on an outer wall surface of the second driving member 620. The operating sleeve 700 includes a driving portion formed below the abutting plate 624. In some examples, as shown in FIG. 17, a support base 701 for supporting the driving portion is further included.
When unlocking of the mounting shaft 410 is needed, as shown in FIG. 15, the operating sleeve 700 is driven to move from bottom to top. During movement of the operating sleeve 700, the driving portion abuts against the abutting plate 624 and drives the second driving member 620 to move upward, thereby causing the relief groove 621 to be disposed directly opposite the limiting member 500 again. At this time, a force is applied downward on the mounting shaft 410, and an outer wall surface of the mounting shaft 410 pushes the limiting member 500 to cause the limiting member 500 to enter the relief groove 621, thereby releasing locking of the mounting shaft 410 and enabling the mounting shaft 410 to smoothly disengage from the main shaft 300.
As shown in FIGS. 19 and 22, the working head 400 further includes an eccentric body 420 connected to the mounting shaft 410. The polishing machine 10 further includes a working attachment 900. In one example, the working attachment 900 is detachably connected on the eccentric body 420, and the eccentric body 420 is then connected to the mounting shaft 410. With such arrangement, when the mounting shaft 410 rotates, the eccentric body 420 can perform eccentric rotation relative to the mounting shaft 410, that is, the working attachment 900 performs eccentric rotation.
It should be noted that for any example of the present application, the working head 400 may only include the mounting shaft 410 and directly mount the working attachment 900 to the mounting shaft 410 for use, thereby achieving non-eccentric rotation of the working attachment 900. The eccentric body 420 may also be mounted to the mounting shaft 410 first, and then the working attachment 900 may be mounted to the eccentric body 420 for use, thereby achieving eccentric rotation of the working attachment 900.
To achieve a detachable connection between the working attachment 900 and the eccentric body 420, in some examples, as shown in FIGS. 19 to 21, the working attachment 900 includes a base plate 910 and a first adsorption member 930 connected to each other. A second adsorption member 430 is disposed on the eccentric body 420. The first adsorption member 930 and the second adsorption member 430 are adsorbed through a magnetic force of magnets.
In some specific examples, a mounting cavity is formed on the eccentric body 420. The second adsorption member 430 is disposed within the mounting cavity. The working attachment 900 is inserted into the mounting cavity to enable the first adsorption member 930 and the second adsorption member 430 to be adsorbed.
In some specific examples, the base plate 910 includes a shaft portion and a disk portion coaxially connected. A size of the shaft portion is smaller than a size of the disk portion. A stepped hole is provided within the shaft portion and the disk portion. The first adsorption member 930 includes a first plate portion, a rod portion, and a second plate portion connected in sequence. The second plate portion is disposed within the disk portion, the rod portion is disposed within the shaft portion, and the first plate portion abuts against a top plate of the shaft portion. The shaft portion and the first plate portion extend into the mounting cavity, causing the first plate portion to be adsorbed with the second adsorption member 430.
In some examples, the first adsorption member 930 and the second adsorption member 430 are magnets with opposite magnetic poles.
To achieve a detachable connection between the working attachment 900 and the eccentric body 420, in some parallel examples, as shown in FIGS. 22 to 24, the working attachment 900 includes an attachment mounting shaft 920. The attachment mounting shaft 920 is provided with a mounting hole 921 disposed in a radial direction. The polishing machine 10 further includes an elastic body 950 and an engaging ball 940 connected to the elastic body 950. The elastic body 950 is disposed within the mounting hole 921, and the engaging ball 940 at least partially protrudes from the mounting hole 921. An insertion hole 421 is disposed on the eccentric body 420. An engaging groove 422 is formed by inward recessing on an inner wall surface of the insertion hole 421. During a process of the attachment mounting shaft 920 being inserted into the insertion hole 421, the engaging ball 940 can engage into the engaging groove 422 to lock the attachment mounting shaft 920.
In some examples, the mounting hole 921 penetrates through the attachment mounting shaft 920. A number of the engaging balls 940 is two, and the two engaging balls 940 are respectively connected to two ends of the elastic body 950. Correspondingly, a number of the engaging grooves 422 is two, and the two engaging grooves 422 are respectively used to engage the two engaging balls 940.
FIGS. 25 to 31 disclose a third embodiment of the polishing machine 10.
A polishing machine 10a includes a main engine 100a. The main engine 100a includes a housing 11, a motor 12, a main shaft 300, and a transmission assembly 14. The motor 12 is disposed within the housing 11. The motor 12 has a stator, a rotor, and a motor shaft 121. The motor shaft 121 is rotatable around a motor axis 103. The main shaft 300 is rotatable relative to the housing 11 around a first axis 101. The transmission assembly 14 is used to transmit power between the motor shaft 121 and the main shaft 300. The main shaft 300 outputs power when rotating. The motor 12 is disposed within a motor housing 116. The motor housing 116 may be a part of the housing 11 or may be assembled together with the housing 11.
The transmission assembly 14 includes a first transmission wheel 141, a second transmission wheel 142, and a transmission belt 143. The first transmission wheel 141 is disposed on the motor shaft 121. The second transmission wheel 142 is disposed on the main shaft 300. The transmission belt 143 is drivably connected between the first transmission wheel 141 and the second transmission wheel 142. By adopting a transmission belt 143 transmission, a noise is improved, no gearbox is needed, therefore there is no oil leakage risk, and a failure rate is reduced. In one example, the transmission belt 143 may be a belt.
The housing 11 extends basically in a front-rear direction. The housing 11 includes a grip portion 111 for gripping by a user, a head housing 112 located at a front end of the grip portion 111, and a coupling portion 113 located at a rear end of the grip portion 111. The head housing 112 is used to accommodate the motor 12 and the main shaft 300. The coupling portion 113 is used to mount a battery pack 16. The battery pack 16 can supply power to the motor 12 after being connected to the housing 11. The grip portion 111 is basically perpendicular to the main shaft 300.
The polishing machine 10a further includes an inner housing 15. The inner housing 15 is disposed within the head housing 112 of the housing 11. The inner housing 15 is used to support the motor 12 and the main shaft 300. The motor shaft 121 is disposed through the inner housing 15 and is connected to the inner housing 15 through a first bearing 181. The main shaft 300 is disposed through the inner housing 15 and is connected to the inner housing 15 through a second bearing 182.
The polishing machine 10a further includes an operating switch 19 for controlling starting and stopping of the motor 12. The operating switch 19 is movably connected to the housing 11. The operating switch 19 is capable of moving at least to a first operating position and a second operating position relative to the housing 11. When the operating switch 19 is at the first operating position, the motor 12 rotates at a first rotational speed. When the operating switch 19 is at the second operating position, the motor 12 rotates at a second rotational speed. Both the first rotational speed and the second rotational speed are greater than zero. That is to say, the operating switch 19 can not only start and shut down the motor 12, but also adjust a rotational speed of the motor 12. In fact, the operating switch 19 can perform stepless speed regulation on the motor 12. The operating switch 19 is a stroke switch capable of moving relative to the housing 11 and having a plurality of positions corresponding to a plurality of rotational speeds of the motor 12. In the present example, the operating switch 19 is disposed at a front end of the grip portion 111, facilitating operation. The operating switch 19 slides basically in an up-down direction of the housing 11. When a user grips the grip portion 111, four fingers of a human hand bend, and an index finger is basically in contact with the operating switch 19. The user can press the operating switch 19 using the index finger.
The polishing machine 10a further includes a working head 400. The working head 400 is detachably connected to the main shaft 300. The working head 400 is used to connect a working attachment 900. Through a detachable manner, installation, detachment, and replacement of the working head 400 is facilitated. The working head 400 can have a plurality of types. When one working head 400 is detached, a user can connect another working head 400 to the main engine 100a. Different working heads 400 drive different working attachments 900 to move to achieve different functions. It can be understood that the functions can be one or more of sanding, polishing, and waxing. When a user needs to perform three processes of sanding, polishing, and waxing on a workpiece, the user only needs one polishing machine 10a to install different working heads 400 to complete these three processes, thereby facilitating a user operation, saving a cost, and improving a work efficiency.
In the present embodiment, the working head 400 includes a mounting shaft 410 and an eccentric body 420. The mounting shaft 410 is detachably connected to the main shaft 300. When the mounting shaft 410 is connected to the main shaft 300, the mounting shaft 410 can be driven by the main shaft 300 to rotate around the first axis 101. The eccentric body 420 is used to connect the working attachment 900. The eccentric body 420 and the mounting shaft 410 form a rotary connection. The eccentric body 420 can rotate relative to the mounting shaft 410 around a second axis 102. The second axis 102 is parallel to and spaced from the first axis 101. The polishing machine 10a further includes a mounting assembly 20. The mounting assembly 20 is used to detachably mount the working head 400 to the main shaft 300. The mounting assembly 20 includes an operating member 22. The operating member 22 is for operation by a user to enable the working head 400 to directly disengage from the main shaft 300, enabling a quick and convenient detachment. The mounting assembly 20 further includes a limiting member 500. The limiting member 500 is used to lock or release the working head 400. The limiting member 500 can move between a first position that prevents movement of the mounting shaft 410 relative to the main shaft 300 and a second position that allows movement of the mounting shaft 410 relative to the main shaft 300. The operating member 22 is for operation by a user to cause the limiting member 500 to disengage from the first position.
The working head 400 further includes an external gear ring 54. The external gear ring 54 is connected to the eccentric body 420 and can rotate with the eccentric body 420 around the second axis 102. The polishing machine 10a further includes an internal gear ring 115. The internal gear ring 115 is disposed around an outer circumference of the external gear ring 54 with the first axis 101 as an axis. A portion of the external gear ring 54 meshes with the internal gear ring 115.
When the mounting shaft 410 rotates around the first axis 101, the mounting shaft 410 drives the eccentric body 420 and the external gear ring 54 to revolve around the first axis 101. Because the external gear ring 54 meshes with the internal gear ring 115, the external gear ring 54 also rotates around the second axis 102 while revolving around the first axis 101. When the polishing machine 10a is started, under driving of the mounting shaft 410, the eccentric body 420 drives the external gear ring 54 and the working attachment 900 to revolve around the first axis 101. Simultaneously, because the external gear ring 54 meshes with the internal gear ring 115, an entirety formed by the external gear ring 54, the eccentric body 420, and the working attachment 900 rotates relative to the mounting shaft 410 around the second axis 102. That is to say, when the main engine 100a mounts the working head 400, regardless of whether the working attachment 900 contacts a workpiece, the working attachment 900 revolves around the first axis 101 and also rotates around the second axis 102.
Through meshing of the internal gear ring 115 and the external gear ring 54, the working attachment 900 of the polishing machine 10a performs an eccentric movement relative to the main shaft 300, and the eccentric movement is a forced eccentric movement, enabling the working attachment 900 to have a large swing amplitude during work. A contact area and an angle with a workpiece are more diverse, thereby improving a polishing efficiency.
In the present embodiment, a driving hole 131 centered on the first axis 101 is formed within the main shaft 300. The driving hole 131 is for insertion of the mounting shaft 410. The mounting shaft 410 includes a rotating shaft capable of being inserted into the driving hole 131. An accommodating hole 132 for accommodating the limiting member 500 is formed on a hole wall of the driving hole 131. The accommodating hole 132 penetrates through the driving hole 131 in a radial direction of the main shaft 300. The limiting member 500 can move within the accommodating hole 132 in the radial direction of the main shaft 300 to the first position and the second position.
A mating structure is formed on the mounting shaft 410. The mating structure is used to mate with the limiting member 500. Specifically, the mating structure formed on the mounting shaft 410 is a first groove 511, and the limiting member 500 is a sphere capable of partially embedding into the first groove 511. As shown in FIGS. 8 to 10, when the limiting member 500 is at the first position, a portion of the limiting member 500 extends into the driving hole 131 and embeds into the first groove 511. At this time, the limiting member 500 restricts sliding of the mounting shaft 410 in a direction of the first axis 101, thereby being able to prevent the mounting shaft 410 from disengaging from the main shaft 300 in the direction of the first axis 101. Similarly, when the limiting member 500 is at the first position, the limiting member 500 embeds into the first groove 511, and the limiting member 500 also restricts rotation of the mounting shaft 410 relative to the main shaft 300, thereby enabling the main shaft 300 to output power to the mounting shaft 410 through the limiting member 500 to drive the mounting shaft 410 to rotate around the first axis 101. As shown in FIGS. 11 and 12, when the limiting member 500 is at the second position, the limiting member 500 is located outside the driving hole 131, and the limiting member 500 also disengages from the first groove 511, so that the limiting member 500 no longer restricts sliding of the mounting shaft 410 in the direction of the first axis 101, thereby being able to allow the mounting shaft 410 to disengage from the main shaft 300 in the direction of the first axis 101.
A manner of operating the operating member 22 by a user may be rotation or sliding. In the present embodiment, when a user operates the operating member 22 to slide upward relative to the housing 11 along the first axis 101, the operating member 22 can drive the limiting member 500 to disengage from the first position. At this time, the user can detach the mounting shaft 410 from the main shaft 300. A portion of the operating member 22 is located outside the housing 11, facilitating a user operation, and a portion of the operating member 22 extends into the housing 11, facilitating mating with the limiting member 500.
The housing 11 further includes a guiding member 114. At least a portion of the operating member 22 is fitted over an outside of the guiding member 114. The guiding member 114 is configured to guide the operating member 22 to slide along the first axis 101. The internal gear ring 115 is disposed at a lower end of the guiding member 114. The internal gear ring 115 and the guiding member 114 may be disposed separately, or may be integrally molded. In the present embodiment, the internal gear ring 115 and the guiding member 114 are integrally molded, facilitating processing and production.
Specifically, the guiding member 114 is disposed at a lower end of the head housing 112, and an upper portion of the operating member 22 is fitted over an outside of the head housing 112. The guiding member 114 is made of a metal material. The guiding member 114 guides the operating member 22 to slide along the first axis 101, thereby making sliding of the operating member 22 smoother. The head housing 112 is made of plastic, and the guiding member 114 is a metal component. This avoids problems of unsmooth sliding of the operating member 22 and deformation or damage of the head housing 112 caused by directly guiding the operating member 22 through the head housing 112. The guiding member 114 is fixedly connected to the head housing 112, specifically through a bolt connection.
The operating member 22 is disposed around the first axis 101. The operating member 22 may be a sleeve. The operating member 22 is fitted over an outside of the guiding member 114, enabling the operating member 22 to slide relative to the head housing 112 in a direction of the first axis 101. Specifically, both the operating member 22 and the guiding member 114 are disposed around the first axis 101, and the guiding member 114 protrudes downward from the head housing 112. An outer diameter of the internal gear ring 115 is greater than an outer diameter of the guiding member 114 to form a stepped surface. The stepped surface is configured to limit a bottom end of the operating member 22.
The mounting assembly 20 further includes a first biasing member 23. The first biasing member 23 biases the operating member 22 to generate a biasing force that drives the operating member 22 to reset. The first biasing member 23 is a first spring fitted over an outside of the guiding member 114. The first spring is located between the head housing 112 and the operating member 22. One end of the first spring biases the head housing 112, and another end biases the operating member 22. Specifically, one portion of the first spring is fitted over the head housing 112, and another portion is fitted over an outside of the guiding member 114. Similarly, one portion of the operating member 22 is fitted over the head housing 112, and another portion is fitted over an outside of the guiding member 114.
The mounting assembly 20 further includes a second driving member 620 and a second biasing member 25. The second driving member 620 is used to contact the limiting member 500. The second biasing member 25 contacts the second driving member 620 to generate a biasing force that drives the limiting member 500 to move toward the first position.
The second driving member 620 is specifically a sleeve sleeved on the main shaft 300. A driving surface 241 is formed on the second driving member 620. The second biasing member 25 is a second spring sleeved on the main shaft 300. The second spring biases the second driving member 620 to drive the second driving member 620 to move toward a position where the driving surface 241 contacts the limiting member 500.
A contact portion 221 that contacts the second driving member 620 is further formed on the operating member 22. The contact portion 221 extends into the housing 11. When the operating member 22 slides upward, the contact portion 221 pushes the second driving member 620 upward to compress the second biasing member 25. At this time, the driving surface 241 no longer contacts the limiting member 500.
A second surface 242 is further formed on the second driving member 620. When the second driving member 620 moves upward until the second surface 242 aligns with the limiting member 500, the limiting member 500 is no longer pressed by the driving surface 241. At this time, the second driving member 620 allows the limiting member 500 to disengage from contact with the mounting shaft 410, thereby enabling a user to pull out the working head 400.
The mounting assembly 20 further includes an anti-slip member. The anti-slip member is fixedly disposed on an outer circumference of the operating member 22 to increase a friction force when contacting a user, facilitating the user operation. The anti-slip member may be made of a rubber material.
Referring to FIGS. 27 to 31, the polishing machine 10a further includes a reset assembly 30. The reset assembly 30 is disposed within the driving hole 131 (see FIG. 28) of the main shaft 300 and is located at an upper end of the working head 400. The reset assembly 30 is configured to keep the limiting member 500 at the second position when the working head 400 or the mounting shaft 410 disengages from the main shaft 300. When the working head 400 needs to be installed, the mounting shaft 410 can be directly inserted into the driving hole 131 of the main shaft 300, improving an assembly efficiency. Because the limiting member 500 is kept at the second position, no interference is caused to insertion of the mounting shaft 410 into the driving hole 131.
The reset assembly 30 includes an elastic member 31 and a return block 32. The return block 32 is slidingly connected to the driving hole 131. A limiting protrusion 133 is disposed on an inner wall of the driving hole 131. The elastic member 31 is disposed between the return block 32 and the limiting protrusion 133. When the working head 400 or the mounting shaft 410 disengages from the main shaft 300, the return block 32 moves to a position directly opposite the accommodating hole 132 to keep the limiting member 500 at the second position. The elastic member 31 provides an elastic force for downward movement of the return block 32.
When the mounting shaft 410 is inserted into the driving hole 131, the mounting shaft 410 compresses the return block 32, causing the elastic member 31 to be compressed until the first groove 511 on the mounting shaft 410 aligns with the accommodating hole 132, and the limiting member 500 embeds into the first groove 511 under an action of the second driving member 620. When detaching the working head 400, by sliding the operating member 22 to cause the limiting member 500 to disengage from the first position, the working head 400 can move relative to the main shaft 300. As the mounting shaft 410 disengages from the main shaft 300, the elastic member 31 pushes the return block 32 to move under an elastic restoring force, causing the return block 32 to move to a position directly opposite the accommodating hole 132, and the return block 32 abuts against the limiting member 500 to keep the limiting member 500 at the second position.
The reset assembly 30 further includes a support post 33. The return block 32 is connected to a lower end of the support post 33. The limiting protrusion 133 restricts a travel of the support post 33. When the mounting shaft 410 is inserted into the driving hole 131, the mounting shaft 410 compresses the return block 32, causing the elastic member 31 to be compressed. At this time, the support post 33 slides upward. When the working head 400 disengages from the main shaft 300, the support post 33 slides downward until abutting against the limiting protrusion 133. At this time, the elastic member 31 is still in a compressed state. The arrangement of the support post 33 can play a limiting role on the return block 32, causing the return block 32 to remain at a position directly opposite the accommodating hole 132.
Additionally, when detaching the working head 400, the elastic member 31 restores elasticity, and the return block 32 can apply an ejection force to the working head 400 that disengages from the main shaft 300, making the working head 400 more convenient to detach.
FIGS. 32 to 37 disclose a fourth embodiment of the polishing machine.
The fourth embodiment has a same principle as the third embodiment, with a difference being in a connection manner between the return block 32 and the main shaft 300. Components with same reference numerals in FIGS. 32 to 37 as those in the previous first embodiment, second embodiment, and third embodiment have same functions and will not be described one by one here. Only differences between the fourth embodiment and the third embodiment will be described in detail.
The main shaft 300 contains a hollow accommodating cavity. A top of the accommodating cavity is sealed, and a bottom is open. An elastic member 31 is disposed between the top of the accommodating cavity and the return block 32. The return block 32 is connected to the main shaft 300 through a positioning pin 33. The return block 32 has a through hole 321 that penetrates therethrough. The main shaft 300 is provided with through slots 310. The positioning pin 33 passes through the through hole 321 and the slots 310, enabling two ends of the positioning pin 33 to slide within the two slots 310.
As shown in FIGS. 32 to 35, when the mounting shaft 410 is inserted into the main shaft 300 from bottom to top, the mounting shaft 410 pushes the return block 32 to move upward. When the mounting shaft 410 moves upward until the limiting member 500 enters the accommodating portion 301, the mounting shaft 410 is restricted by the limiting member 500 and cannot continue moving upward, achieving locking of the mounting shaft 410. At this time, the operating sleeve 700 is moved upward, a sleeve driving portion 710 drives the second driving member 620 to move upward, the elastic member 31 drives the return block 32 to move downward, and simultaneously the limiting member 500 is pushed into the relief groove 621, enabling the main shaft 300 to be smoothly removed. When detaching the working head 400, the return block 32 can apply an ejection force to the working head 400 that disengages from the main shaft 300, making the working head 400 more convenient to detach.
It should be supplemented that for all technical solutions of the present application, a rotational speed of the main shaft 300 is greater than or equal to 500 RPM and less than or equal to 8000 RPM, that is to say, a rotational speed of the mounting shaft 410 and the working head 400 is greater than or equal to 500 RPM and less than or equal to 8000 RPM. In some examples, a rotational speed of the power tool is greater than or equal to 2000 RPM and less than or equal to 8000 RPM. In some examples, a rotational speed of the power tool is greater than or equal to 3000 RPM and less than or equal to 8000 RPM. A series of technical solutions of the present application enables the mounting shaft 410 to not easily disengage from the main shaft 300 when the working attachment rotates at a high speed, that is to say, a mating between the mounting shaft 410 and the main shaft 300 in a direction of the first axis 101 is relatively stable. With such arrangement, when the working head 400 rotates at a high speed, a vibration generated by an entire power tool is relatively small.
The basic principles, main features, and advantages of this application are shown and described above. It is to be understood by those skilled in the art that the aforementioned examples do not limit the present application in any form, and all technical solutions obtained through equivalent substitutions or equivalent transformations fall within the scope of the present application.

Claims

A polishing machine, comprising:
a housing;

a motor;

a main shaft drivably connected to a motor shaft of the motor, the main shaft being rotatable relative to the housing around a first axis;

a mounting shaft detachably connected to the main shaft; and

a limiting member and a locking mechanism, wherein a movement of the mounting shaft activates the locking mechanism, such that the locking mechanism allows the limiting member to move to restrict the mounting shaft's motion along the first axis.
The polishing machine according to claim 1, wherein a limiting groove is formed on the mounting shaft, and during a process of the mounting shaft being connected to the main shaft from bottom to top, the limiting member falls into the limiting groove to lock the mounting shaft in place.
The polishing machine according to claim 2, wherein the locking mechanism comprises a driving member and an operating sleeve movably sleeved on the main shaft, the operating sleeve being capable of driving the driving member to move, such that the limiting member disengages from the limiting groove.
The polishing machine according to claim 3, wherein the driving member is a first driving member, and the first driving member rotationally drives the limiting member to disengage from the limiting groove.
The polishing machine according to claim 3, wherein the driving member is a second driving member, and the second driving member translationally drives the limiting member to disengage from the limiting groove.
The polishing machine according to claim 5, wherein the second driving member is a ring sleeve structure sleeved on the main shaft, a relief groove is formed on an inner side of the second driving member, a connecting end of the main shaft is provided with an insertion hole for insertion of the mounting shaft along an axial direction, an accommodating portion is provided radially penetrating through the connecting end of the main shaft, and the limiting member has a relief position where the limiting member is pushed by the mounting shaft to enter the relief groove and a locking position where the limiting member is engaged in the limiting groove.
The polishing machine according to claim 6, wherein the second driving member comprises a first retaining portion located on an upper side of the relief groove, the first retaining portion having an inclined surface on a side close to the relief groove, and a diameter of the first retaining portion is smaller than a diameter of the relief groove.
The polishing machine according to claim 7, wherein, before the second driving member is driven by the operating sleeve, the first retaining portion abuts against an upper portion of the limiting member.
The polishing machine according to claim 4, wherein an accommodating portion is provided through a connecting end of the main shaft in a radial direction, the limiting member is movably disposed within the accommodating portion, the polishing machine further comprises a limiting sleeve, the limiting sleeve is movably sleeved on the main shaft, a top of the limiting sleeve forms a limiting portion that limits the limiting member within the accommodating portion, and the limiting member has an initial position where the limiting member is limited within the accommodating portion, a relief position, where the limiting member is pressed by the mounting shaft to move past the limiting portion to an upper side of the limiting portion, and a locking position, where the limiting member is engaged between the limiting portion and the limiting groove.
The polishing machine according to claim 9, wherein the polishing machine further comprises a pivoting pressing plate and an elastic member, the pivoting pressing plate is located such that two ends of a pivot shaft of the pivoting pressing plate respectively press against a top of the limiting member and a top of the limiting sleeve and form a seesaw structure, and the elastic member has a movement tendency to reset the limiting portion to limit the limiting member within the accommodating portion.
The polishing machine according to claim 10, wherein the first driving member comprises a pivoting lifting plate, the operating sleeve is capable of driving the pivoting lifting plate to rotate, and rotation of the pivoting lifting plate drives the pivoting pressing plate to rotate in an opposite direction.
The polishing machine according to claim 3, wherein, when the operating sleeve is operated, the mounting shaft is disengageable from the main shaft.
The polishing machine according to claim 12, wherein, when the operating sleeve is moved in an up-down direction, the mounting shaft is disengageable from the main shaft.
The polishing machine according to any one of claim 1 to 13, wherein the mounting shaft is connectable to an eccentric body, and a working attachment for performing a polishing operation is detachably connected on the eccentric body.
The polishing machine according to claim 1, further comprising a reset assembly, a driving hole centered on the first axis is formed within the main shaft, the driving hole is for insertion of the mounting shaft, the reset assembly is disposed within the driving hole and located at an upper end of the mounting shaft, the reset assembly comprises an elastic member and a return block, and the elastic member provides an elastic force for downward movement of the return block.
A power tool, comprising:
a housing;

a motor;

a main shaft drivably connected to a motor shaft of the motor and rotatable relative to the housing around a first axis;

a mounting shaft detachably connected to the main shaft, and a working attachment is attached to a bottom of the mounting shaft;

a limiting member located at a first position or a second position, when the mounting shaft is mounted to the main shaft, the limiting member is located at the first position to restrict movement of the mounting shaft along the first axis and, when the limiting member is at the second position, the limiting member allows the mounting shaft to disengage from the main shaft; and

a locking mechanism configured to drive the limiting member to move from the second position to the first position;

wherein a movement of the mounting shaft activates the locking mechanism such that the limiting member is allowed to move to the second position.
The power tool according to claim 16, wherein a limiting groove is formed on the mounting shaft, and during a process of the mounting shaft being connected with the main shaft from bottom to top, the limiting member falls into the limiting groove to lock the mounting shaft in place.
The power tool according to claim 17, wherein the locking mechanism comprises a driving member and an operating sleeve movably sleeved on the main shaft, the operating sleeve is capable of driving the driving member to move, such that the limiting member disengages from the limiting groove, and the driving member translationally drives the limiting member to disengage from the limiting groove.
The power tool according to claim 16, further comprising a reset assembly, a driving hole centered on the first axis is formed within the main shaft, the driving hole is for insertion of the mounting shaft, the reset assembly is disposed within the driving hole and located at an upper end of the mounting shaft, and the reset assembly is configured to keep the limiting member at the second position when the mounting shaft disengages from the main shaft.
The power tool according to claim 19, wherein the reset assembly comprises an elastic member and a return block, and the elastic member provides an elastic force for downward movement of the return block.