Dust collecting device for electric tools

Abstract

The present invention relates to a dust collecting device for electric tools, belonging to the technical field of tools. The dust collecting device comprises a shell for accommodating a fan and installing a dust collecting box; a telescopic suction pipe extending from the shell to the dust collecting place; a fan arranged in the shell for generating a suction airflow in the suction pipe; a dust collecting box detachably connected to the shell for collecting dust; a filter located downstream of the dust collecting box and upstream of the fan; a dust cleaning device for cleaning the accumulated dust on the filter; the dust cleaning device comprises: a driving member, which is respectively in the first and second positions when the dust collecting box is attached to or detached from the shell; a dust cleaning member, which touches the filter or the filter mounting part and is connected to the driving member through a transmission mechanism. The present invention can effectively prevent the poor filtering effect caused by the tool user neglecting dust cleaning and affecting the cleanliness of the working environment.

Description

Technical Field

[0001] The invention relates to a dust collecting device, in particular to a dust collecting device matched with an electric tool, belonging to the technical field of tools. Background Art

[0002] In order to collect the dust caused by cutting in time, in recent years, electric tools such as electric hammers and sanders have begun to be equipped with dust collection devices. A typical dust collection device is disclosed in the Chinese patent document with application number 201822177688.7. This dust collection device includes a housing, a telescopic suction pipe connected to the housing, a suction fan located in the housing and operable to generate a vacuum in the suction pipe, a dust container connected to the housing and located upstream of the fan, a filter at least partially arranged in the dust container, and a filter cleaning mechanism, the filter cleaning mechanism includes an anvil and a striker, the striker can be moved between a first striker position and a second striker position, in which the striker is spaced apart from the anvil, and in the second striker position, the striker is in contact with the anvil.

[0003] In addition, the Chinese patent document with application number 201910851598.8 discloses another dust suction device for a hand-held machine tool, comprising a housing, a mechanical interface for releasably connecting the dust suction device to the hand-held machine tool, a dust collecting chamber connected to the filter unit, and a filter cleaning unit, wherein the filter cleaning unit has an impact element, which is movably supported in and / or on the housing of the dust suction device.

[0004] According to the applicant's understanding, existing dust collection devices, including the above-mentioned patent, require conscious human control to remove dust from the filter. In fact, tool users often lack the awareness of cleaning the filter and only pay attention to dumping the dust after the dust box is full of dust. Even if the dust collection device is equipped with special manual cleaning actuators such as buttons and knobs, they are usually ignored and rarely cleaned actively. As a result, it is difficult for the filter to function effectively, affecting the dust removal effect of the power tool working environment. Summary of the invention

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art and to propose an electric tool dust collection device that can automatically clean dust through structural improvements, so that the filter can effectively play its role and ensure the dust collection effect of the working environment.

[0006] In order to achieve the above object, the electric tool dust collecting device of the present invention comprises

[0007] A housing for accommodating a fan and installing a dust collection box;

[0008] A telescopic suction pipe extending from the housing to a dust suction location;

[0009] a fan, disposed in the housing, for generating a suction airflow in the suction pipe;

[0010] A dust collecting box, detachably connected to the housing, for collecting dust;

[0011] A filter located downstream of the dust box and upstream of the fan;

[0012] A dust cleaning device, used for cleaning the dust accumulated on the filter;

[0013] The dust removal device comprises:

[0014] a driving member, which is respectively in a first position and a second position when the dust box is attached to or detached from the housing;

[0015] The dust cleaning member contacts the filter or the filter mounting portion and is connected to the driving member through a transmission mechanism.

[0016] In this way, when the dust needs to be dumped and the dust box is separated from the shell, the cleaning part will be driven to touch the filter due to the change in the position of the driving part, thereby automatically cleaning the dust; thereafter, when the dust box is assembled to the shell, the cleaning part will be driven again to clean the dust; therefore, it can effectively prevent the tool user from neglecting cleaning, resulting in poor filtering effect and affecting the cleanliness of the working environment.

[0017] A further improvement of the present invention is that the cleaning member is a flicking finger that touches the filter, and the flicking finger is connected to the driving member through a transmission mechanism that converts the reciprocating motion between the first and second positions into a rotational motion.

[0018] Since the cleaning member of the present invention removes dust from the filter in a plucking manner, it can cause a vibration effect just like plucking a set of spaced strings, and thus has an ideal cleaning effect; and avoids being inserted into the folds of the filter, and has a wide range of adaptability; in particular, whenever the dust box is engaged with or separated from the shell, the driving member will drive the plucking fingers to automatically remove the dust on the filter, and thus cleaning is particularly convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of a preferred embodiment 1 of the present invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the dust box and the shell in the separated state in the embodiment.

[0022] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the dust box and the shell connection process in the embodiment (the compression spring is not shown).

[0023] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure.

[0024] Figure 5 yes Figure 4 AA cross-sectional structure schematic diagram.

[0025] Figure 6 yes Figure 1 A schematic diagram of a three-dimensional exploded structure of one state of a dust cleaning device in an embodiment.

[0026] Figure 7 yes Figure 1 A schematic diagram of the three-dimensional exploded structure of the second state of the dust cleaning device in the embodiment.

[0027] Figure 8 yes Figure 4 BB cross-sectional enlarged structural diagram.

[0028] Fig. 9 It is a structural diagram of embodiment 2 of the present invention.

[0029] Fig.10 It is a schematic diagram of the structure of the third embodiment of the present invention (with the elastic pressing piece removed).

[0030] Fig.11 It is a schematic structural diagram of the fourth embodiment of the present invention (with the elastic pressing piece removed). DETAILED DESCRIPTION

[0031] Embodiment 1

[0032] The present invention is guided by the invention purpose of realizing automatic dust cleaning. On the basis of the basic technical scheme that the assembly and disassembly action of the dust box and the shell is transformed into the cleaning work of the cleaning part vibrating the filter by the driving part through the transmission mechanism, as long as a driving part is appropriately set to transmit the assembly and disassembly action and a certain transmission mechanism is selected to transmit the transmission to the cleaning part, the assembly and disassembly action of the dust box and the shell can be cleverly utilized to complete automatic dust cleaning. Therefore, many implementation methods can be evolved.

[0033] The following is a preferred embodiment of these embodiments. The basic structure of the dust collecting device of this embodiment is as follows: Figure 1As shown, it includes a housing 2 for accommodating a fan 3 and installing a dust collecting box 1. A telescopic and adjustable dust suction pipe 5 is installed at the front end of the housing 2, and the suction pipe on the dust suction pipe 5 is connected to the suction port 4 at the front end, thereby forming a telescopic suction pipe structure extending to the dust collection place that is basically the same as the prior art. The fan 3 arranged in the rear part of the housing 2 is electrically connected to the terminal 6 at the upper rear of the housing 2, and an arc hook 2-1 is provided above the middle part of the housing 2. The rear end of the housing 2 is provided with a locking lever 2-3 driven by the inclined surface of the button 2-4, and the upper end of the locking lever 2-3 has a locking hook head 2-2. When the dust collecting device of this embodiment is combined with the matching tool, it is very convenient to just hang the hook pin at the corresponding position of the tool with the arc hook 2-1, and lock the depression at the corresponding position of the tool with the help of the locking hook head 2-2. After the combination, the suction port 4 will be located near the tool head, and the terminal 6 will contact the power supply terminal in the tool to power the fan. When it is necessary to disassemble, just press the button 2-4 to make the locking lever 2-3 drive the locking hook 2-2 to escape from the locking position, which is also very convenient.

[0034] A detachable dust box 1 for collecting dust is installed at the lower part of the shell 2. An air guide plate 1-1 is provided under the air inlet at the upper front of the dust box 1, a folding filter 1-2 with a frame is provided at the upper rear, a hinge fulcrum 1-3 matching the hinged recess at the corresponding position of the shell 2 is provided at the lower rear, and an elastic pressing piece 1-5 is provided at the front side, and the elastic pressing piece 1-5 has a barb 1-4 matching the hook groove at the corresponding position of the shell 2. The hinge fulcrum 1-3 of the dust box 1 is embedded in the hinged recess, and the front end is pushed up so that the barb 1-4 on the elastic pressing piece 1-5 is inserted into the hook groove at the corresponding position of the shell 2, so that they can be connected to each other; and the elastic pressing piece 1-5 is pressed to make the barb 1-4 fall out of the hook groove, so that the dust box 1 can be disassembled very easily. After assembly, the folding filter 1-2 is located downstream of the dust box 1 and upstream of the fan 3. When the fan 3 rotates, negative pressure will be generated, and dusty air will be sucked in from the suction port 4, enter the air inlet of the dust collecting box 1 through the suction pipe, and then filtered and output by the filter 1-2, and finally the clean air will be discharged from the air outlet grille 2-5 of the shell 2.

[0035] The dust collecting box 1 of this embodiment is used for cleaning the dust accumulated on the filter 1-2. Figures 2 to 7 The driving member is composed of a lifting rod 1-11 mounted on a transfer core rod 1-15. The lifting rod 1-11 has a convex key 1-12' on the rod body in the middle part, which forms a lifting and moving pair with the dust box 1. The upper end is a button plate that contacts the limit rib 2-6 of the shell 2 during installation, and the lower end is a chassis that presses the compression spring 1-17. When the dust box 1 is assembled with the shell 2, the lifting rod 1-11 is in Figure 3 (Has not reached the lower limit) as shown in the descending position to overcome the force of the compression spring 1-17, and when the dust box 1 and the shell 2 are separated, the lifting rod 1-11 is in Figure 2The lifting position of the compression spring 1-17 shown in the figure is reset. The dust cleaning member of this embodiment is composed of a plucking finger 1-18 fixedly connected to the indexing column 1-19, and the plucking finger 1-18 is in the shape of a claw with the fingertip touching the lower folded edge of the folded filter 1-2 upward. The indexing column 1-19 and the dust collecting box 1 form a rotating pair, and the lower end of the indexing core rod 1-15 is inserted into the insertion hole at the upper end thereof. The lower end of the indexing core rod 1-15 has a symmetrical notch 1-16, as shown in FIG. Figure 8 As shown, the socket at the upper end of the indexing post 1-19 has a symmetrical protrusion 1-19' that matches it, and the central angle a of the notch 1-16 is greater than the central angle b of the protrusion 1-19', so the two constitute a circumferential constraint of the gap. When the indexing core rod 1-15 rotates counterclockwise relative to the indexing post 1-19, it will drive the indexing post 1-19 to rotate accordingly, and then drive the plucking finger 1-18 to index; and when the indexing post 1-19 rotates counterclockwise relative to the indexing core rod 1-15 within the range of an angle less than ab, it will not affect the original position of the indexing core rod 1-15.

[0036] In order to ensure that the indexing core rod 1-15 can be plugged with the indexing column 1-19, a holding spring 1-13 is installed between its upper end and the lifting rod 1-11. The upper section of the indexing core rod 1-15 is inserted into the bottom hole of the lifting rod 1-11 through a hexagonal prism to form an axial moving pair, and the lifting rod 1-11 has a ">"-shaped curved groove 1-12 on the rod body, and the curved groove 1-12 and the radial pin 1-14 on the indexing core rod 1-15 form a cam pair, which constitutes a transmission mechanism between the cleaning part and the driving part to realize their transmission connection.

[0037] It can be understood that the above structure realizes that when the dust box is assembled with the shell, the limiting rib presses down the lifting rod, and the indexing core rod drives the indexing column constrained circumferentially to rotate under the action of the curved groove cam pair (in this process, the protrusion of the indexing column is against the notch of the indexing core rod, and the two are in a one-way circumferential constraint state, so the indexing core rod will drive the indexing column to rotate together), thereby driving the plucking finger to poke the folded edge of the filter, causing vibration to effectively clean the dust; conversely, when the dust box is separated from the shell, the plucking finger will also automatically clean the dust. In addition, since the curved groove is in the shape of “>”, the rise or fall of the lifting rod causes the plucking finger to reciprocate and vibrate once respectively.

[0038] It is particularly worth mentioning that this embodiment does not select simple transmission mechanisms such as nut screw, rack gear or end cam to convert the linear motion of the lifting rod into the rotational motion of the plucking finger. This is because it takes into account the function of manual cleaning while realizing automatic cleaning.

[0039] The lower end of the indexing column 1-19 is inserted on the base plate 1-22 fixed to the bottom of the dust box 1 to form a rotating pair, and is located in the opening 1-25 of the cleaning dial button 1-24 which forms a horizontal moving pair with the base plate 1-22. One side of the opening 1-25 has a V-shaped notch 1-26, and the pin 1-21 inserted and fixed on the indexing column 1-1 retaining 9 is located in the V-shaped notch 1-26. The indexing column 1-19 is equipped with a torsion spring 1-23 that keeps the raised side of its socket tending to abut against the notch 1-16 of the indexing core rod 1-15. A reset spring 1-28 is installed in the recess 1-27 at the end of the cleaning dial button 1-24 away from the opening 1-25. When the cleaning dial button 1-24 is toggled with a finger to overcome the force of the reset spring 1-28, the V-shaped notch of the cleaning dial button 1-24 will drive the indexing column 1-19 through the pin 1-21. Figure 6 The initial position shown in the figure is rotated clockwise, thereby driving the plucking finger 1-18 to poke the folded edge of the filter, causing vibration to effectively clean the dust; when the dust cleaning dial button 1-24 is released, it is reset to the position under the action of the reset spring 1-28. Figure 5 In the state shown, the indexing post 1-19 will be reset at the same time under the action of the reset torsion spring 1-23, and the plucking finger 1-18 will reversely pry the folded edge of the filter to clean the dust. In this process, the protrusion of the indexing post is in a gap position that does not abut against the notch of the indexing core rod, that is, the two are in a non-constrained state of the circumferential gap, so the indexing post will not drive the indexing core rod.

[0040] It can be seen that this embodiment can not only realize automatic cleaning when the dust box and the shell are assembled and disassembled, but also realize manual cleaning, and the two cleaning methods are grafted into the same cleaning mechanism without interfering with each other.

[0041] Embodiment 2

[0042] The dust collecting device of this embodiment is as follows Fig. 9 As shown, its basic structure is similar to that of the first embodiment, except that, in order to simplify the structure, only automatic dust cleaning is realized without manual dust cleaning function, so the lower end of the indexing core rod 1-15 constituting a circumferential constraint with the dust box 1 is inserted into the insertion hole at the upper end of the indexing column 1-19 constituting a rotating pair, or the upper end of the indexing column 1-19 is connected to the indexing core rod 1-15 as a whole, when the indexing core rod 1-15 rotates counterclockwise relative to the indexing column 1-19, it will drive the indexing column 1-19 to rotate accordingly, and then drive the picking finger 1-18 to rotate. And the lifting rod 1-11 has a unidirectional spiral curved groove 1-12' on the rod body, without the need for a ">"-shaped curved groove 1-12.

[0043] Embodiment 3

[0044] The dust collecting device of this embodiment is as follows Fig.10As shown, its basic structure is closest to that of the second embodiment, except that the lower end of the rod body of the lifting rod 1-11 is directly connected with the upper end of the indexing column 1-19 through the inclined plane pair 1-12", thereby forming a transmission mechanism between the cleaning part and the driving part to realize the transmission connection.

[0045] When the dust box is assembled with the shell, the limiting rib presses down the lifting rod, and the inclined surface drives the indexing column to rotate, thereby driving the plucking finger to poke the folded edge of the filter, causing vibration to effectively clean the dust; conversely, when the dust box is separated from the shell, the lifting rod rises when reset, and the indexing column rotates in the opposite direction, thereby driving the plucking finger to poke the folded edge of the filter in the opposite direction to automatically clean the dust.

[0046] Embodiment 4

[0047] The dust collecting device of this embodiment is as follows Fig.11 As shown, its basic structure is similar to that of the first embodiment, except that the driving member of the cleaning device 1-10 is composed of an elastic reset lifting rod 1-11 which forms a vertical moving pair with the dust box 1, and the lower part of the lifting rod 1-11 is a lifting rack 1-19', which is meshed with a transmission gear 1-19" supported in the dust box 1, and the transmission gear 1-19" is connected to a turning finger 1-18' as a cleaning member through a horizontal shaft 1-18", and the arc fingertip of the turning finger 1-18' touches the lower folding edge of the folded filter 1-2, that is, the lifting rod as a driving member is connected to the turning finger as a cleaning member through a rack and gear transmission mechanism. The T-shaped groove 1-5' in the figure is used to insert the upper end of the elastic pressing piece 1-5.

[0048] When the dust box is assembled with the shell, the limiting rib presses down the lifting rod, which drives the transmission gear to rotate through the lifting rack, and then drives the turning finger to move the folded edge of the filter, causing vibration to effectively clean the dust; conversely, when the dust box is separated from the shell, the elastic reset of the lifting rod causes the turning finger to automatically clean the dust.

[0049] In addition to the above embodiments, the present invention may also have other implementations. For example, the dust cleaning part does not directly touch the filter, but touches the filter frame or even the direct or indirect installation part of the filter such as the dust box housing, which can also produce a vibration effect on the filter; for another example, the transmission mechanism can also be other linear-rotation transmission mechanisms such as a screw nut mechanism. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A dust collecting device for an electric tool, comprising: A housing for accommodating a fan and installing a dust collection box; A telescopic suction pipe extending from the housing to a dust suction location; a fan, disposed in the housing, for generating a suction airflow in the suction pipe; A dust collecting box, detachably connected to the housing, for collecting dust; A filter located downstream of the dust box and upstream of the fan; A dust cleaning device, used for cleaning the dust accumulated on the filter; Features: The dust removal device comprises: a driving member, which is respectively in a first position and a second position when the dust box is attached to or detached from the housing; The dust cleaning member contacts the filter or the filter mounting portion and is connected to the driving member through the transmission mechanism; The driving member is composed of a lifting rod sleeved on the indexing core rod, a convex key is provided on the rod body in the middle of the lifting rod to form a lifting and moving pair with the dust collecting box, and the upper end of the lifting rod is a button plate that contacts the limiting rib of the shell during installation; The cleaning component is composed of a plucking finger fixedly connected to the indexing column, the filter is a folded filter, and the plucking finger is in the shape of a claw with the fingertip touching the lower folded edge of the folded filter upward; the indexing column and the dust collecting box form a rotating pair, and the lower end of the indexing core rod is inserted into the upper end socket of the indexing column to form a circumferential constraint on the gap.

2. The electric tool dust collection device according to claim 1, characterized in that: The upper section of the transfer core rod is inserted into the bottom hole of the lifting rod through a hexagonal prism to form an axial movement pair. The rod body of the lifting rod is provided with a ">"-shaped curved groove, and the curved groove and the radial pin on the transfer core rod form a cam pair.

3. The electric tool dust collection device according to claim 2, characterized in that: The lower end of the transfer core rod has a symmetrical notch, and the insertion hole of the transfer column has a matching symmetrical protrusion, and the central angle of the circle corresponding to the notch is greater than the central angle of the circle corresponding to the protrusion.

4. The electric tool dust collection device according to claim 3, characterized in that: The lower end of the lifting rod is a chassis that presses against a compression spring; when the dust box is assembled with the shell, the lifting rod is in a lowered position; when the dust box is separated from the shell, the lifting rod is in a raised position where the compression spring is reset.

5. The electric tool dust collection device according to claim 4, characterized in that: A holding spring is arranged between the upper end of the transfer core rod and the lifting rod.

6. The electric tool dust collection device according to claim 1, characterized in that: The upper end of the transfer column is connected to the transfer core rod as a whole, and the rod body of the lifting rod is provided with a unidirectional spiral curved groove.

7. The electric tool dust collection device according to claim 1, characterized in that: The lower end of the rod body of the lifting rod is connected with the upper end of the indexing column through an inclined surface pair, forming a transmission mechanism between the dust cleaning part and the driving part.

8. A dust collecting device for an electric tool, comprising A housing for accommodating a fan and installing a dust collection box; A telescopic suction pipe extending from the housing to a dust suction location; a fan, disposed in the housing, for generating a suction airflow in the suction pipe; A dust collecting box, detachably connected to the housing, for collecting dust; A filter located downstream of the dust box and upstream of the fan; A dust cleaning device, used for cleaning the dust accumulated on the filter; Features: The dust removal device comprises: a driving member, which is respectively in a first position and a second position when the dust box is attached to or detached from the housing; The dust cleaning member contacts the filter or the filter mounting portion and is connected to the driving member through the transmission mechanism; The driving member is composed of an elastic reset lifting rod which forms a vertical moving pair with the dust box. The filter is a folded filter. The lower part of the lifting rod is a lifting rack. The lifting rack is meshed with a transmission gear supported in the dust box. The transmission gear is connected to a rotary finger serving as a cleaning member through a horizontal axis. The arc fingertip of the rotary finger touches the lower folded edge of the folded filter.

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