Cyclone dust collecting device and grinding device

A cyclone dust collecting device includes a dust collecting box and a separator. The dust collecting box includes a dust entrance and a cavity formed by extension in a first direction. The dust entrance communicates with a dust exhaust channel of a host machine. The separator includes a dust inlet and a cyclone tube. The dust inlet communicates with the dust entrance. The dust inlet is configured to guide the dust exhaust airflow into the cyclone tube. The cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box. The cyclone tube includes a dust outlet and an air outlet. The dust outlet is located in the cavity and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction.

RELATED APPLICATION INFORMATION

This application claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. CN 202010610476.2, filed on Jun. 29, 2020, and Chinese Patent Application No. CN 202021237149.9, filed on Jun. 29, 2020, which are incorporated by reference in their entirety herein.

BACKGROUND

Dust is generated when an electric tool (such as a grinding device) is used to process a workpiece. The dust not only pollutes the air but also exposes an operator to a dust environment. Therefore, the electric tool is typically equipped with a dust collecting device.

The electric tool is typically provided with the dust collecting device. The dust collecting device is typically provided with a dust separating part. The dust is left in the dust collecting device after being separated by the dust separating part, and a dust exhaust airflow is discharged out of the device. Therefore, when the dust is accumulated to an outlet of the dust separating part, the dust flies out of a dust collecting box along with the dust exhaust airflow. At this time, the dust collecting box is unable to effectively store the dust, and the dust in the dust collecting device needs to be dumped so as to ensure continuous dust collection. However, the dust separating part of the dust collecting device is typically disposed along an axial direction of a dust inlet in the existing art. Therefore, a space in the dust collecting device cannot be effectively utilized, and the frequency of dust dumping of a user is increased, which is not conducive to improving use feeling of the user.

SUMMARY

A cyclone dust collecting device includes a dust collecting box including a dust entrance and a cavity formed by extension in a first direction, wherein the dust entrance communicates with a dust exhaust channel of a host machine, and a dust exhaust airflow enters the cavity through the dust entrance; and a separator including a dust inlet and a cyclone tube, wherein the dust inlet communicates with the dust entrance, the dust inlet is configured to guide the dust exhaust airflow into the cyclone tube, the cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box, the cyclone tube includes a dust outlet and an air outlet disposed on the cyclone tube, the dust outlet is located in the cavity, and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction such that the dust outlet is higher than the dust inlet and the air outlet is lower than the dust inlet.

In one example, a vertical distance between a top wall and a bottom wall of the dust collecting box is H, the cyclone tube has a central axis, and a vertical distance between the central axis at the dust inlet and the bottom wall of the dust collecting box is h, wherein 0.5≤h/H≤0.9.

In one example, the first direction and the second direction obliquely intersect each other in a vertical plane and have an included angle in between, and the included angle is greater than or equal to 15° and less than or equal to 45°.

In one example, the cyclone tube includes a guide piece disposed at the air outlet, and the guide piece is configured to guide an air-out direction at the air outlet to deviate toward a direction away from the host machine with respect to the second direction.

In one example, the dust collecting box further includes an end cover and a dust cylinder which are detachably connected to each other, the end cover is detachably connected to the host machine, the cavity is formed in the dust cylinder, and the dust inlet is formed on the end cover.

In one example, the dust collecting box further includes a dust blocking piece, the dust cylinder is provided with an opening facing the host machine, and the dust blocking piece is disposed on a bottom wall at the opening of the dust cylinder.

In one example, the cyclone dust collecting device further includes a mounting structure disposed between the end cover and the dust cylinder, and the dust cylinder and the end cover are detachably connected to each other through the mounting structure.

In one example, the mounting structure includes an elastic buckle, and two elastic buckles are provided and disposed on opposite two sides of the dust cylinder.

In one example, the elastic buckle includes an elastic arm disposed on the dust cylinder, wherein the elastic arm is provided with a protrusion portion; and a claw disposed on the end cover, wherein the claw is provided with a groove which is fitted with the protrusion portion for locking.

In one example, the mounting structure includes a limiting protrusion disposed on the end cover; and a rotation buckle disposed on the dust cylinder, the rotation buckle is pivotally connected to the dust cylinder, the rotation buckle includes a hook portion and a biasing member, and the biasing member is configured to apply, to the hook portion, a biasing force which enables the hook portion to be fitted with the limiting protrusion for locking.

In one example, the dust collecting box includes a second joint for connecting a first joint of the host machine, and the second joint is detachably connected to the first joint through a locking member.

In one example, the locking member includes a first locking member disposed on one of the first joint and the second joint, wherein the first locking member is a protrusion radially protruding from the one of the first joint and the second joint; and a second locking member disposed on an outer periphery of the other joint of the first joint and the second joint, wherein the second locking member includes a sliding groove which is suitable for entry and locking of the first locking member, the sliding groove includes a guide groove and a locking groove, the guide groove is disposed obliquely with respect to an axis of the other joint, and the locking groove is disposed at an end of the guide groove and configured to restrict the first locking member from disengaging from the locking groove.

In one example, the guide groove is an arc groove, two protrusions and two sliding grooves are provided, the two protrusions are symmetrically disposed about an axis of the first joint, and the two sliding grooves are respectively disposed on opposite two sides of an outer periphery of the second joint.

In one example, the cyclone dust collecting device further includes an auxiliary disengaging member, the auxiliary disengaging member is sandwiched between the first joint and the second joint and has a biasing force applied to the second joint to disengage the second joint from the first joint, the second joint is sleeved on the first joint, the auxiliary disengaging member is an elastic cushion, and the elastic cushion engages with an inner wall of the second joint.

In one example, the dust collecting box further includes an end cover and a dust cylinder, the dust cylinder is provided with a top wall and a bottom wall, the second direction is arranged obliquely relative to the top wall, and the second direction is also arranged obliquely relative to the bottom wall.

A cyclone dust collecting device includes a dust collecting box including a dust entrance and a cavity formed by extension in a first direction, wherein the dust entrance communicates with a dust exhaust channel of a host machine, and a dust exhaust airflow enters the cavity through the dust entrance; and a separator including a dust inlet and a cyclone tube, wherein the dust inlet communicates with the dust entrance, the dust inlet is configured to guide the dust exhaust airflow into the cyclone tube, the cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box, the cyclone tube includes a dust outlet and an air outlet disposed on the cyclone tube, the dust outlet is located in the cavity, and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction.

A grinding device includes a body including a dust exhaust channel; a baseplate assembly including a baseplate for mounting a grinding member; a driving mechanism disposed in the body, wherein the driving mechanism is configured to drive the baseplate assembly to move; a fan assembly is configured to form a dust exhaust air path; and a cyclone dust collecting device. The cyclone dust collecting device includes a dust collecting box including a dust entrance and a cavity formed by extension in a first direction, wherein the dust entrance communicates with the dust exhaust channel, and the dust exhaust airflow enters the cavity through the dust entrance; and a separator including a dust inlet and a cyclone tube, wherein the dust inlet communicates with the dust entrance, the dust inlet is configured to guide the dust exhaust airflow into the cyclone tube, the cyclone tube extends in a second direction and is at least partially disposed in the dust collecting box, the cyclone tube includes a dust outlet and an air outlet, the dust outlet is located in the cavity, and the air outlet communicates with an outside of the dust collecting box. The second direction obliquely intersects the first direction such that the dust outlet is higher than the dust inlet and the air outlet is lower than the dust inlet.

In one example, a vertical distance between a top wall and a bottom wall of the dust collecting box is H, the cyclone tube has a central axis, and a vertical distance between the central axis at the dust inlet and the bottom wall of the dust collecting box is h, wherein 0.5≤h/H≤0.9.

In one example, the included angle exists between the first direction and the second direction in a vertical plane, and the included angle is greater than or equal to 15° and less than or equal to 45°.

In one example, the dust collecting box further includes an end cover and a dust cylinder, the dust cylinder further includes a dust blocking piece, the dust cylinder is provided with an opening facing the body, and the dust blocking piece is disposed on a bottom wall at the opening of the dust cylinder.

In the cyclone dust collecting device provided by the present disclosure, an included angle exists between the second direction and the first direction such that the inlet is higher than the dust inlet and the outlet is lower than the dust inlet. Therefore, the cyclone is obliquely disposed in the dust collecting box, a size of the dust collecting box in the axial direction is reduced, and the internal structure of the dust collecting box is more compact. The dust flows upward from the dust inlet and enters the dust collecting box at the inlet and accumulates in the dust collecting box. Since the inlet of the cyclone is raised, an effective dust accumulation space below an end portion is increased, and the dust collection space is increased without increasing a volume of the dust collecting box. In this manner, the dust collecting efficiency is higher, and the frequency of dust dumping of a user is reduced. At the same time, the outlet is disposed facing away from the host machine so that the dust exhaust airflow is prevented from blowing to the host machine and part of the dust that has not been effectively collected is prevented from blowing to the body along with the outlet of the separator.

DETAILED DESCRIPTION

An example of the present disclosure provides a grinding device, and a sander is used as an example. Referring toFIG. 1, a host machine100of the sander includes at least a body10, a baseplate assembly20, a driving mechanism and a fan assembly. The top of the body10is formed with a holding portion for a user to hold, and the body10is configured to accommodate the driving mechanism and the fan assembly.

The baseplate assembly20is configured to fix a grinding member for implementing the functions of grinding and polishing. The baseplate assembly20includes a baseplate21, one side of the baseplate21facing the body10is connected to the body10through a vibration bracket, and another side of the baseplate21is used for fixing the grinding member such as a sandpaper.

The driving mechanism is configured to drive the baseplate assembly20to move and includes a motor. An output shaft of the motor is connected to the baseplate assembly20in a transmission manner so that the baseplate assembly20is driven to move, thereby implementing functions of grinding and polishing of the sander.

The fan assembly is used for forming a dust exhaust air path, the body10is provided with a dust exhaust channel10a, and the dust exhaust channel10aincludes a dust outlet disposed on one side of the body10. Dust is generated when the grinding piece acts on a workpiece. The sandpaper and the baseplate21are provided with a dust exhaust hole, air and the dust are sucked into the dust exhaust channel10ain the body10through the dust exhaust hole, and a dust exhaust airflow mixed with dust flows out from the dust exhaust channel10a.

Referring toFIGS. 2 and 3, the sander provided by the example of the present disclosure further includes a cyclone dust collecting device300, the dust exhaust airflow flows out from the dust exhaust channel10aof the body to the cyclone dust collecting device300, and the cyclone dust collecting device300separates the air from the dust and collects the dust in the dust collecting device.

Referring toFIGS. 2 and 3, the cyclone dust collecting device300in the example of the present disclosure includes a dust collecting box30and a separator40. The dust collecting box30includes a dust entrance301and a cavity302formed by extension in a first direction. The dust entrance301communicates with a dust outlet of the dust exhaust channel10aof the host machine100, and the dust exhaust airflow enters the cavity302through the dust entrance301.

Referring toFIGS. 3, 7 and 8, the dust collecting box30includes an end cover31and a dust cylinder32which are detachably connected to each other, the end cover31is detachably connected to the body10, the cavity302is formed in the dust cylinder32, and the dust entrance301is formed on the end cover31. The end cover31and the dust cylinder32of the dust collecting box30are detachably connected to each other so that it is convenient to open the end cover to dump the dust. Specifically, as shown inFIGS. 9 and 10, the body10of the host machine100includes a first joint11extending into a tubular shape, and an opening of the tubular first joint11is formed with the dust outlet. As shown inFIGS. 7, 9 and 10, the dust collecting box30includes a second joint311, and as shown inFIG. 2, an open end of the second joint311is formed with the dust entrance301.

The separator40in the example of the present disclosure includes a mounting base43and a cyclone tube42. The mounting base43is connected to the end cover31and is provided with a dust inlet41. The mounting base is provided with the dust inlet41, the dust inlet41communicates with the dust entrance301, and the cyclone tube42extends in a second direction and is at least partially disposed in the dust collecting box30.

Two cyclones42are provided and disposed in parallel, and the two cyclones42are both connected to the mounting base43. The cyclone tube42includes a separating cylinder disposed at a rear end of the mounting base43(the rear end refers to the right side inFIG. 3, that is, one end away from the host machine100) and an air-outlet cylinder disposed at a front end of the mounting base43(the front end refers to the left side inFIG. 3, that is, one end facing to the host machine100). A rear end of the separating cylinder is provided with a dust outlet421for the dust exhaust airflow to enter, and the dust outlet421is located in the cavity302. A front end of the air-outlet cylinder is provided with an air outlet422for the dust exhaust airflow to discharge, and the air outlet422is used for communicating with an outside of the dust collecting box30. The end cover31is provided with two through holes corresponding to the air-outlet cylinders, and the air-outlet cylinders of the cyclone tube42pass through the through holes on the end cover31and communicate with the outside of the dust collecting box30.

The air carrying the dust enters the cavity302from the dust entrance301and the dust inlet41, the dust is separated and collected into the dust collecting box30after rotating around an outer periphery of a separating cylinder, and finally, the dust exhaust airflow enters the cyclone tube42through the dust outlet421of the cyclone tube42and is discharged out of the dust collecting box30through the air outlet422of the air-outlet cylinder.

Referring toFIG. 2, in this example, the first direction refers to an axial direction of the dust entrance301, and the second direction refers to an axial direction of the cyclone tube42. The second direction obliquely intersects the first direction. Specifically, the second direction obliquely intersects the first direction in a vertical plane. It may also to be understood that the second direction obliquely intersects the first direction in a plane perpendicular to a bottom wall32bof the dust collecting box. In this manner, the dust outlet421of the cyclone is higher than the dust inlet41, and the air outlet422of the cyclone tube42is lower than the dust inlet41, so that the cyclone tube42being obliquely disposed in the dust collecting box30is implemented.

Specifically, an included angle between the first direction and the second direction in the vertical plane is greater than or equal to 15° and less than or equal to 45°. InFIG. 2, the first direction is denoted by O1and the second direction is denoted by O2, and the included angle between the first direction and the second direction is denoted by α.

On the one hand, the cyclone inclines within the above-mentioned angle so that the reduction of an axial size (that is, a size of the dust collecting box in the front and rear direction) of the dust collecting box30is facilitated and a volume of the dust collecting box30is smaller. On the other hand, since the dust outlet421of the cyclone tube42is raised, an effective dust accumulation space located below the dust outlet421is increased, the dust collection efficiency is higher, and the frequency of dust dumping of a user is reduced. Therefore, the effective dust accumulation space is ensured on the basis of reducing the volume of the dust collecting box, and the reduction of the dust accumulation space is avoided.

Referring toFIG. 6, in the example of the present disclosure, the air outlet422of the cyclone tube42is disposed away from the host machine100. Specifically, the cyclone tube42in the example of the present disclosure includes a guide piece423disposed at the air outlet422. The guide piece423is configured to guide an air-out direction at the air outlet422to deviate toward a direction away from the host machine100with respect to the second direction. The guide piece423changes the air-out direction at the air outlet422so that residual dust carried in an exhaust airflow is avoided from being sprayed and accumulated on the body of the host machine100.

The air outlet422is disposed facing away from the host machine100. Specifically, the air outlet422may be disposed facing an operating table or a rear end of the body; or the air outlet422is disposed obliquely relative to the baseplate assembly such that the air outlet422discharges air flow toward lower rear part of the body.

Since the air outlet422of the cyclone tube42is disposed facing away from the host machine100, a dust exhaust airflow that still carries a small amount of dust may be prevented from being blown onto the body10of the host machine100, thereby preventing the dust from accumulating on the body and ensuring the cleanliness and beauty of the appearance of the host machine100.

Referring toFIG. 2, in this example of the present disclosure, a vertical distance between a top wall32aand a bottom wall32bof the dust collecting box30is H, a vertical distance between a central axis of the cyclone tube42at the dust outlet421and the bottom wall32bof the dust collecting box30is h, and the central axis of the cyclone tube42is shown as the second direction O2. H and h are shown inFIG. 2, where 0.5≤h/H≤0.9. In this example, h/H is 0.5, 0.6, or 0.8. Specifically, the central axis at the inlet refers to a position where the dust outlet421intersects the axis of the cyclone so that the dust outlet421is as close as possible to the top of the dust collecting box30, and a position of the dust outlet421is higher than a middle position of the dust collecting box30so that the effective dust accumulation space located below the dust outlet421is increased, the dust collection efficiency is higher, and the frequency of dust dumping of the user is reduced.

Referring toFIGS. 4 to 6, the separator40includes two cyclones42, the two cyclones42share one dust inlet41, and each cyclone tube42is provided with the dust outlet421and the air outlet422.

Referring toFIG. 8, the dust collecting box30further includes a dust blocking piece33, the dust cylinder32is provided with an opening32cfacing the host machine100, and the dust blocking piece33is disposed on a bottom wall32bat an opening32cof the dust cylinder32. The dust blocking piece33is capable of preventing the dust in the dust cylinder32from falling when the end cover31is disengaged from the dust cylinder32. The dust blocking piece33may be a plastic piece or a gasket. The dust blocking piece33may be integrally formed with the dust collecting box or may be separately formed and then mounted in the dust collecting box, which is not limited herein.

Referring toFIG. 3, in the example of the present disclosure, the end cover31and the dust cylinder32of the dust collecting box30are detachably connected to each other. Specifically, the sander further includes a mounting structure30adisposed between the end cover31and the dust cylinder32. The dust cylinder32is detachably connected to the end cover31through the mounting structure30a, where the mounting structure30amay be an engagement structure.

In this example, the mounting structure30aincludes an elastic buckle30b, and two elastic buckles30bare provided and disposed on opposite two sides of the dust cylinder32. During mounting, the end cover31is inserted into the dust cylinder32so that the elastic buckle30bimplements locking. The arrangement of the elastic buckle30bfacilitates mounting and disassembly.

Referring toFIGS. 7 and 8, specifically, in this example, the elastic buckles30bare disposed on upper and lower sides of the dust collecting box30, and the elastic buckle30bincludes an elastic arm321and a claw313. A pair of elastic arms321are disposed on upper and lower sides of the dust cylinder32. Each elastic arm321is provided with a protrusion portion3211. A pair of claws313are correspondingly disposed on upper and lower sides of the end cover31, and each claw313is provided with a groove3131that is fitted with the protrusion portion3211for locking. When the end cover is mounted, the claw313is inserted into an outside of the elastic arm321, the elastic arm321is compressed toward an inner side of the dust collecting box30and deformed with the insertion of the claw313, and when the claw313is mounted to a predetermined position, the protrusion portion3211outside the elastic arm321enters the groove3131inside the claw313. At this time, the elastic arm is held in a locked state with the claw313under its own elastic biasing force so that the claw313cannot be disengaged from the dust collecting box30. When the end cover is opened, a free end of the elastic arm321is pressed and since the elastic arm is compressed toward the inside of the dust collecting box, the protrusion portion3211on the elastic arm is disengaged from the groove3131inside the claw313. At this time, the end cover31is allowed to be opened and disengaged from the dust collecting box30.

Referring toFIGS. 9 to 14, in the example of the present disclosure, the dust collecting box30is detachably connected to the body10. The second joint311of the dust collecting box30has a locked state in which the second joint311is fitted with the first joint11of the body10for locking and an open state in which the second joint311is disengaged from the first joint11. When the second joint311is fitted with the first joint11for locking, the dust entrance301communicates with the dust outlet. For example, the first joint11and the second joint311may be locked in a threaded connection manner or in an engagement manner.

In this example, the first joint11is fitted with the second joint311for locking through a locking member. The locking member includes a first locking member and a second locking member. The first locking member is disposed on one of the first joint and the second joint, and the first locking member is radially protruding from the one joint. The second locking member is disposed on an outer periphery of the other joint of the first joint and the second joint, and the second locking member includes a sliding groove which is suitable for entry and locking of the first locking member.

Referring toFIGS. 12 to 14, in this example, the locking member includes the first locking member111and the second locking member, and the first locking member111is disposed on the first joint11. Specifically, the first locking member111is a protrusion radially protruding from the first joint11. The second locking member is disposed on the second joint311and includes the sliding groove312which is suitable for entry and locking of the protrusion. The sliding groove312includes a guide groove3121and a locking groove3122, the guide groove3121is disposed obliquely on an outer periphery of the second joint311with respect to an axis of the second joint311, and the locking groove3122is disposed at an end of the guide groove3121and configured to restrict the first locking member111from disengaging from the locking groove3122and entering the guide groove3121. In this example, the guide groove3121is an arc groove, and the guide groove3121is connected to the locking groove3122in a smooth-transition manner. Therefore, it is ensured that the first locking member111can easily slide into the locking groove3122during locking, which facilitates convenient operation of the user and improves the operation hand feeling of the user. Of course, positions of the first locking member and the second locking member are interchangeable.

In this example, two protrusions and two sliding grooves312are provided, the two protrusions are symmetrically disposed about an axis of the first joint11, and the two sliding grooves312are respectively disposed on opposite two sides of the outer periphery of the second joint311.

Referring toFIGS. 11 and 12, the sander further includes an auxiliary disengaging member50, the auxiliary disengaging member50is sandwiched between the first joint11and the second joint311and has a biasing force applied to the second joint311to disengage the second joint311from the first joint11. When the second joint311is fitted with the first joint11in a locked state for locking, the first joint11and the second joint311press the auxiliary disengaging member50to elastically deform the auxiliary disengaging member50. When the second joint311is disengaged from the first joint11, the auxiliary disengaging member50generates a thrust force on the second joint311to assist in disengaging the second joint311, thereby achieving rapid disassembly. On the other hand, the auxiliary disengaging member50may also play a function of auxiliary seal for the first joint and the second joint to ensure relative sealing of the first joint and the second joint.

In the example of the present disclosure, the auxiliary disengaging member50is specifically an elastic cushion, where the second joint311is sleeved on the first joint11so that an inner wall of the second joint311is annularly provided with a slot suitable for mounting the elastic cushion. Specifically, a position of an inner side of the second joint311corresponding to an end portion of the first joint11in an axial direction of the first joint is provided with the slot used for mounting the elastic cushion. Referring toFIG. 11,FIG. 11illustrates the auxiliary disengaging member50in a compressed state, and when the dust collecting box30is mounted and fixed to the body, the first joint11abuts against and compresses the elastic cushion. Referring toFIG. 12,FIG. 12illustrates the auxiliary disengaging member50in an uncompressed state, and when the dust collecting box30is removed from the body, the elastic cushion returns to a free state.

When the dust collecting box is mounted, the second joint311rotates in a locking direction and guides the protrusion to enter the guide groove3121of the sliding groove312, and the second joint311is further rotated so that the protrusion enters the locking groove3122of the sliding groove312. Since the locking groove3122is disposed at the end of the guide groove3121and an included angle exists between the locking groove3122and the guide groove3121, the locking groove3122plays a function of limiting the protrusion and preventing the protrusion from sliding out along the guide groove3121. During locking, the first joint11and the second joint311press the auxiliary disengaging member50to elastically deform the auxiliary disengaging member50.

When the dust collecting box is disassembled, the protrusion is guided to slide into the guide groove3121from the locking groove3122, and the auxiliary disengaging member50returns deformation to provide an elastic force for auxiliary unlocking so that the protrusion quickly slides out of the guide groove3121, thereby achieving rapid disassembly. The dust collecting box30is fitted with the body10through the first joint11and the second joint311, and rapid mounting and disassembly are achieved in a rotation manner so that the mounting is facilitated and time is saved. The auxiliary disengaging member50is used for providing the second joint311with the elastic force assisting the second joint311in being disengaged from the dust collecting box during unlocking so that the second joint311can be quickly bounced away from the first joint11, thereby improving the disassembly efficiency.

An outer circumferential surface of the first joint11is provided with a recess for mounting a sealing ring, and the sealing ring is mounted in the recess and sandwiched between the inner wall of the second joint311and an outer wall of the first joint11. The sealing ring mainly plays a function of sealing.

To sum up, the cyclone tube42is disposed obliquely in the dust collecting box30so that the axial size of the dust collecting box30can be reduced and the size of the dust collecting box30is small; and the dust flows upward from the dust inlet41and enters the dust collecting box30at the dust outlet421and accumulates in the dust collecting box30, and since the dust outlet421of the cyclone tube42is raised, the effective dust accumulation space below the end portion of the cyclone tube42is increased. Therefore, the dust collecting efficiency is higher without increasing the volume of the dust collecting box, and the frequency of dust dumping of the user is reduced.

FIGS. 9 to 16show a sander including another cyclone dust collecting device300, where the structure of the host machine100of the sander and the main parts of the dust collecting box are the same as those described in the previous example and will not be repeated here. The same or corresponding parts as those described in the previous example are given the same reference numerals as those described in the previous example. The difference from the previous example is that the mounting structure30aused for disassembling the dust cylinder and the end cover of the dust collecting box is different.

In this example, the mounting structure30abetween the dust collecting box30and the body10includes a rotation buckle322and a limiting protrusion314. Specifically, as shown inFIGS. 15 and 16, the limiting protrusion314is disposed on the end cover31, the rotation buckle322is disposed on the dust cylinder32, and the rotation buckle322is pivotally connected to the dust cylinder32through a rotating shaft3222. The rotation buckle322includes a hook portion3220and a biasing member3221, and the biasing member3221is configured to apply a biasing force, to the hook portion3220, which enables the hook portion3220to be fitted with the limiting protrusion314for locking. The biasing member3221is a spring, and the spring and the limiting protrusion314are respectively disposed on two sides of the rotating shaft3222.

During mounting, one end of the rotation buckle322is pressed such that the rotation buckle322is rotated relative to the dust cylinder32; the end cover31is buckled at an opening of the dust cylinder32so that the limiting protrusion314is located below the hook portion3220of the rotation buckle322; the rotation buckle322is released, and the hook portion3220is engaged with the limiting protrusion314; and since the biasing member3221applies the biasing force, to the hook portion3220, which enables the hook portion3220to be fitted with the limiting protrusion314for locking, the buckle is in the locked state.

In this example, the locking between the end cover31and the dust cylinder32can be achieved with simply one rotation buckle322, and the structure is simpler and the mounting and disassembly are easier through the single-side engagement manner. Of course, two rotation buckles disposed opposite to each other may also be provided, which is no limited herein.

As shown inFIG. 17, the baseplate21comprise an upper surface21aand a lower surface21b, and the lower surface21bextends alone a plane P. The intersection point P1of central axis O2of the cyclone tube42and the baseplate21is provided on the lower side of the upper surface21aof the baseplate21. The guide piece423is provided with a guide plane423afor guiding the dust exhaust airflow to deviate from the central axis O2. The cross-sectional line L1of the guide plane423ain a vertical plane does not pass through the baseplate21.

The above examples describe merely the basic principles and characteristics of the present disclosure and the present disclosure is not limited to the above examples. Various modifications and changes may be made in the present disclosure without departing from the spirit and scope of the present disclosure. These modifications and changes fall within the scope of the present disclosure. The scope of the present disclosure is defined by the appended claims and equivalents thereof.