CN117718856A - Sanding machine - Google Patents

Abstract

The invention relates to a sander, which comprises a shell, a driving assembly, a fan assembly and a bottom plate assembly, wherein the shell comprises a main shell for accommodating the driving assembly and a middle cover connected with the main shell, and the middle cover is positioned between the main shell and the bottom plate assembly; the sander further comprises an air flow element positioned between the middle cover and the bottom plate component, the air flow element and the middle cover form a dust discharging channel, the bottom plate component comprises a bottom plate connected with the driving component and a dust guide ring arranged between the bottom plate and the air flow element, the driving component drives the fan component to rotate so as to generate chip removing air flow, and the chip removing air flow is transmitted to the dust discharging channel through the dust guide ring. According to the dust collecting device, the air flow element is arranged between the middle cover and the bottom plate component, the dust discharging channel is formed between the air flow element and the middle cover, the dust guide ring is arranged between the bottom plate and the air flow element, the driving component drives the dust collecting fan to rotate so as to generate the dust removing air flow, and the dust removing air flow is transmitted to the dust discharging channel through the dust guide ring, so that the dust collecting device is simple and compact in structure and is beneficial to improving dust collecting efficiency.

Description

Sanding machine

[ technical field ]

The invention relates to the technical field of sanding machines, in particular to a sanding machine with high dust collection efficiency.

[ background Art ]

The plate sander is a polishing tool which is mainly used for daily furniture polishing, steel polishing and other processes. In general, a cooling fan and a dust collecting fan are arranged in the plate sander, wherein air flow formed by rotation of the cooling fan dissipates heat of the whole sander; the dust generated by processing is thrown out by the air flow formed by the rotation of the dust collecting fan, so that the grinding process of the sander is completed.

In the prior art, reference may be made to chinese patent No. CN106141842B, which is issued 8/20/2019, which discloses: a plate sander has a casing, an upper dust sucking disc and a swinging seat for forming an air channel connected to dust collector for collecting dust. Specifically, an upper dust collection inlet formed by an upper dust collection disc on one side, far away from the motor, of the swing seat is in butt joint with a lower dust collection opening formed by a lower dust collection disc on one side, far away from the casing, of the bottom plate frame, a lower fan is driven by the motor to rotate, vortex is formed, and after adsorption force is generated, the lower dust collection inlet enters the dust collection device through an air guide channel. The dust collection efficiency of the plate sander depends on the rotation speed of the fan, and the dust inlet of the air guide channel is less, so that the dust collection efficiency is low, and dust polished by the plate sander cannot be well collected to the dust collection device, thereby causing harm to the health of operators.

In view of the foregoing, it is desirable to provide an improved sander that overcomes the shortcomings of the prior art.

[ summary of the invention ]

Aiming at the defects of the prior art, the invention aims to provide a sander with compact structure and high dust collection efficiency.

The invention solves the problems in the prior art by adopting the following technical scheme: the sander comprises a shell, a driving assembly arranged in the shell, a fan assembly connected with the driving assembly and a bottom plate assembly driven by the driving assembly, wherein the shell comprises a main shell for accommodating the driving assembly and a middle cover connected with the main shell, and the middle cover is positioned between the main shell and the bottom plate assembly; the sanding machine further comprises an air flow element positioned between the middle cover and the bottom plate component, wherein a dust exhaust channel is formed between the air flow element and the middle cover, the bottom plate component comprises a bottom plate connected with the driving component and a dust guide ring arranged between the bottom plate and the air flow element, the driving component drives the fan component to rotate so as to generate chip removal air flow, and the chip removal air flow is transmitted to the dust exhaust channel through the dust guide ring.

The further improvement scheme is as follows: the air flow element is provided with a wind shield positioned between the dust guide ring and the middle cover, the shell also comprises a guide part protruding from the inner wall of the middle cover, and the wind shield is combined with the guide part.

The further improvement scheme is as follows: the dust guide ring is configured into a truncated cone shape, and an included angle theta formed by the inclined surface and the bottom surface of the dust guide ring is 70-80 degrees.

The further improvement scheme is as follows: the wind shield comprises a stop surface connected with the middle cover and a circulation hole penetrating through the stop surface, and the diameter of the circulation hole is smaller than the minimum inner ring diameter of the dust guide ring.

The further improvement scheme is as follows: the wind deflector further comprises a guide part protruding from the stop surface, and the guide part is abutted to the guide part.

The further improvement scheme is as follows: the driving assembly is provided with a motor axis, the distance from the guide part to the motor axis is a first distance, and the curvature of the first distance along the center of the flow hole is gradually increased.

The further improvement scheme is as follows: the bottom plate has from the sunken bottom plate cavity of terminal surface and set up in the dust absorption mouth of the circumference of bottom plate cavity, the dust guide ring butt in the dust absorption mouth, the outer lane diameter of dust absorption mouth with the outer lane diameter of dust guide ring equals.

The further improvement scheme is as follows: the base plate also has a flow port adjacent to the dust collection port, and the chip removal air flow is transmitted to the dust guide ring through the flow port and the dust collection port.

The further improvement scheme is as follows: the connecting line of the central points of the two opposite side walls of the bottom plate is provided with dividing lines which divide the bottom plate into four quadrants, each quadrant comprises a quarter of the dust collection openings, and the dust collection openings are configured to be in mirror image distribution.

The further improvement scheme is as follows: each of the quadrants includes a quarter of the flow openings and the flow openings are configured as mirror images.

Compared with the prior art, the invention has the following beneficial effects: through installing the air current component between intermediate cap and bottom plate subassembly, this air current component is formed with the dust exhaust passageway with intermediate cap, and installs the dust guide circle between bottom plate and air current component, and drive assembly drives the dust collection fan and rotates in order to produce the chip removal air current, and the chip removal air current is transmitted to the dust exhaust passageway through the dust guide circle, and simple structure is compact, is favorable to improving dust collection efficiency. Specifically, the air flow element is provided with a wind shield, the wind shield is combined with a guide part protruding from the inner wall of the middle cover, a cavity between the middle cover and the bottom plate is compressed, the dust collecting fan rotates to form negative pressure, the flow rate of dust is improved, and the dust is collected to the dust collecting device more quickly; furthermore, the dust guide ring is configured into a truncated cone shape, the inclined plane and the bottom surface of the dust guide ring form an included angle of 70-80 degrees, so that chip removal airflow can conveniently form a spiral vortex shape and form gathering after passing through the dust collection channel, and the dust is more quickly transmitted to the dust discharge channel, and the dust collection efficiency is improved; in addition, the wind shield also comprises a guide part protruding from the stop surface, the guide part is abutted to the guide part, the cavity of the dust discharging channel is compressed, and the chip removal airflow can be intensively transmitted to the dust collecting device, so that the dust collecting efficiency is high.

[ description of the drawings ]

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of the overall structure of a sander according to the present invention;

FIG. 2 is a schematic cross-sectional view of the sander of FIG. 1 taken along the direction A;

FIG. 3 is a schematic view in partial cross-section of the entire machine of the sander shown in FIG. 1;

figure 4 is a schematic cross-sectional view of the sander of figure 1 taken along the direction B,

FIG. 5 is a schematic view of an exploded view of the sander shown in FIG. 1;

FIG. 6 is a schematic view of the wind deflector of the sander shown in FIG. 5;

FIG. 7 is a schematic view of the dust evacuation channel of the sanding machine of FIG. 5 in the middle cover;

FIG. 8 is a schematic view of a dust guard structure of the sander shown in FIG. 2;

FIG. 9 is a schematic view of the platen seal of the sander shown in FIG. 8;

FIG. 10 is a schematic view of the seal of the sander shown in FIG. 8;

FIG. 11 is an exploded schematic view of the floor assembly of the sander shown in FIG. 5;

FIG. 12 is a schematic cross-sectional view of the floor assembly of the sander shown in FIG. 11;

FIG. 13 is a schematic perspective view of the base plate of the sander shown in FIG. 5;

fig. 14 is a schematic plan view of the floor of the sander shown in fig. 13.

Meaning of reference numerals in the drawings:

main shell 11 of sander 100 shell 1

Second chamber 120 of intermediate cover 12 first bearing 121

Second dust-proof rib 122 fourth dust-proof rib 123 guide 13

Bearing chamber 130 drives motor axis L of assembly 2

Motor shaft 21 motor 22 eccentric 23

Fan assembly 3 first dust-proof rib 311 of radiator fan 31

Third dust-proof rib 321 positioning rib 3221 of dust-collecting fan 32

Mounting plate 322 floor assembly 4 second bearing 401

Third connecting portion 4111 of bottom plate cavity 411 of bottom plate 41

The engaging portion 4112 is provided with a dust suction port 412 and a flow passage port 413

Third stiffener 4131 bottom cover 414 base plate 4141

The first connecting portion 4142 and the second connecting portion 4143 are engaged with the engaging portion 4144

Bearing cavity 415 second stiffener 4151 step 416

Ribs 4161 dust guide ring 42 backing plate 43

Dust suction hole 431 sealing ring 44 first reinforcing rib 45

First auxiliary reinforcing rib 452 and second auxiliary reinforcing rib 453 of main reinforcing rib 451

First seal 461 of base 460 of seal 46

Lip 4611 second seal 462 fastener 47

Foam pad 48U shaped hole 481 sandpaper clip 49

Air flow element 5 wind deflector 51 stop surface 511

Flow hole 512 guide 513 mounting column 514

Platen seal 6 metal portion 61 elastic portion 62

Connecting portion 621 balancing weight 7 vibration frame 8

Height space 30 of air hole 20 of dust exhaust channel 10

Air inlet end 50 and air outlet end 60 of first cavity 40

The dust collection end 70 is preset with a rotation direction r dividing line L1 and L2

Dust collecting device 200

Detailed description of the preferred embodiments

The invention will be described in further detail with reference to the drawings and embodiments.

The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper", "lower", "front", "rear", etc., indicating an azimuth or a positional relationship are based on only the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus/elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.

Referring to fig. 1 to 5, an embodiment of the present invention relates to a sanding machine 100, which includes a housing 1, a driving assembly 2 installed in the housing 1, a fan assembly 3 connected to the driving assembly 2, and a base plate assembly 4 driven by the driving assembly 2, wherein the housing 1 includes a main housing 11 accommodating the driving assembly 2 and an intermediate cover 12 connected to the main housing 11, and the intermediate cover 12 is located between the main housing 11 and the base plate assembly 4. The drive assembly 2 has a motor axis L, a motor shaft 21 rotating about the motor axis L, and a motor 22 mounted to the motor shaft 21, and the base plate assembly 4 includes a base plate 41 attached to the intermediate cover 12 and sandpaper (not shown) mounted to the base plate 41, the base plate 41 being attached to the motor shaft 21, the sandpaper being secured to the base plate assembly 4 by sandpaper clips 49 on the base plate 41. The sander 100 moves under the power of the driving source to drive the motor shaft 21 of the driving assembly 2 to rotate, so that the sandpaper is driven by the bottom plate 41 to act on the surface of the workpiece to perform sanding treatment, and a large amount of dust is generated.

The casing 1 further comprises an air inlet end 50 positioned at the main casing 11 and an air outlet end 60 positioned at the middle cover 12, the fan assembly 3 comprises a cooling fan 31 and a dust collecting fan 32 which are arranged on the motor shaft 21, the cooling fan 31 and the dust collecting fan 32 are arranged opposite to two sides of the middle cover 12, and the bottom plate assembly 4 is provided with a dust collection end 70 arranged on the bottom plate 41. The motor 22 drives the bottom plate 41 to polish the surface of a workpiece, the fan assembly 3 generates cooling air flow and chip removal air flow under the drive of the motor 22, wherein the cooling air flow enters from the air inlet end 50, flows to the motor 22 and takes away heat generated by the motor 22, and finally flows out from the air outlet end 60 to realize heat dissipation of the motor 22; the debris flow draws the dust generated by the operation from the suction end 70 to the dust collection device 200 of the sander 100.

The middle cover 12 is provided with a bearing chamber 130 recessed from the end surface and a first bearing 121 arranged in the bearing chamber 130, the motor shaft 21 is sleeved on the inner ring of the first bearing 121, the outer ring of the first bearing 121 is combined with the wall surface of the bearing chamber 130, after the motor 22 works, the balls in the first bearing 121 enable the inner ring of the first bearing 121 to synchronously move with the motor shaft 21, and the outer ring of the first bearing 121 is fixedly connected with the middle cover 12.

In the present embodiment, during sanding operation, a large amount of dust is formed, and there is a risk that a small portion of dust enters the interior of the first bearing 121 from the air hole 20 formed by the intermediate cover 12 and the main housing 11, and the dust can be completely blocked by double protection of the first bearing 121, so as to improve the life of the first bearing 121.

Specifically, the heat dissipating fan 31 has a first dust-proof rib 311 protruding from the end surface, the middle cover 12 has a second dust-proof rib 122 protruding from the end surface, the first dust-proof rib 311 is combined with the second dust-proof rib 122 to form a labyrinth dust-proof, and a larger part of the small dust is blocked to form a first heavy protection for the first bearing 121; in addition, the middle cover 12 further has a second chamber 120 recessed radially from the bearing chamber 130, the sander 100 further includes a platen seal 6 sleeved on the motor shaft 21, and the platen seal 6 is combined with the second chamber 120 and abuts against the first bearing 121, so as to further consolidate dust prevention of the first bearing 121, and form a second protection for the first bearing 121.

Further, as shown in fig. 8 and 9, the platen seal 6 includes a metal portion 61 mounted on the intermediate cover 12 and an elastic portion 62 connected to the metal portion 61, the metal portion 61 is combined with the second chamber 120, and the elastic portion 62 abuts against the motor shaft 21. The elastic portion 62 has a connecting portion 621 protruding from an end surface, one side of the connecting portion 621 abuts against the motor shaft 21, and the other side is coupled to the metal portion 61. It should be noted that, the pressing plate seal 6 may be formed by integrally pressing a metal piece and rubber, the metal part 61 is made of a metal piece, the elastic part 62 is made of rubber, and the lip edge of the elastic part 62 is in small interference fit with the motor shaft 21, so that dust is completely blocked, the service life of the first bearing 121 is prolonged, and the service life of the whole machine is prolonged.

Referring to fig. 2 and 5, in the present embodiment, the sander 100 further includes an air flow member 5 located between the middle cover 12 and the base plate assembly 4, wherein the air flow member 5 and the middle cover 12 form a dust exhaust channel 10, the base plate assembly 4 includes a base plate 41 connected to the driving assembly and a dust guide ring 42 installed between the base plate 41 and the air flow member 5, and the dust exhaust air flow transmits the generated dust to the dust exhaust channel 10 via the dust guide ring 42, and finally is collected in the dust collecting device 200. In addition, the dust guide ring 42 compensates for the problem of missing dust collecting function after the height of the bottom plate 41 is reduced, and fully utilizes the cavity formed by the middle cover 12 and the bottom plate 41, so that the overall arrangement is ingenious and the structure is more compact.

Specifically, the base plate assembly 4 further includes a pad plate 43 mounted on the base plate 41 and a foam pad 48 mounted on the pad plate 43, the pad plate 43 has a dust suction hole 431 penetrating along an end surface, the foam pad 48 has a U-shaped hole 481 penetrating from the end surface, the dust suction hole 431 is abutted with the U-shaped hole 481, and the dust suction hole 431, the U-shaped hole 481 and the base plate 41 form a dust suction channel. When the sander 100 polishes a workpiece, the motor 22 drives the dust collecting fan 32 to rotate, so that vortex is formed, adsorption force is generated, dust enters from the dust collecting channel, passes through the dust guide ring 42 and finally enters the dust collecting device 200 through the dust discharging channel.

Further, referring to fig. 11 and 12, the dust guide ring 42 is configured in a circular truncated cone shape, so that the chip removing airflow forms a spiral vortex shape, which is beneficial to guiding the chip removing airflow to flow and discharge from the dust collection channel and the dust discharge channel. In addition, the inclined plane of the dust guide ring 42 and the bottom face form an included angle θ of 70 ° -80 °, and the included angle θ is set to gather the chip removal airflow after passing through the dust collection channel, so as to more rapidly transfer the chip removal airflow to the dust removal channel, thereby improving dust collection efficiency, and in addition, the included angle θ may be preferably 75 °, but is not limited to this angle. It should be noted that the chip removal air flow indicates approximately the path of dust generated by the processing of the sander 100 from the dust suction channel at the dust suction end 70 into the dust guide ring 42, the dust discharge channel formed by the air flow member 5 and the middle cover 12, and the dust collecting device 200.

Referring to fig. 3 to 7, the intermediate cover 12 is configured to accommodate the air flow member 5, i.e., the inner wall of the intermediate cover 12 is formed with a guide portion 13 for guiding the chip removing air flow. Specifically, when the sander 100 starts to operate, the motor shaft 21 drives the fan assembly 3 to rotate along a preset rotation direction around the motor axis L, and the airflow element 5 generates negative pressure in the rotating process, so that the sanded dust is sucked into the dust discharging channel through the dust guiding ring 42. At this time, the rotating dust collection fan 32 throws the sucked air flow along the outer periphery of the blades thereof, and the guide portion 13 guides the flow direction of the dust exhaust air flow and directs the dust exhaust air flow to the dust collection device 200. The preset rotation direction refers to a direction in which the dust collection fan 32 rotates when the motor 22 drives the fan assembly 3 to rotate.

Specifically, the airflow member 5 has a wind deflector 51 between the dust guide ring 42 and the intermediate cover 12, and the wind deflector 51 partially closes the space where the dust collecting fan is located, thereby reducing the size of the dust guide ring 42 and increasing the flow rate.

Further, the casing 1 further includes a guide portion 13 protruding from the inner wall of the intermediate cover 12, and the wind deflector 51 is coupled to the guide portion 13. The guide portion 13 protruding from the inner wall of the middle cover 12 sets the inner cavity of the middle cover 12 as a volute cavity, which is convenient for guiding the chip removal airflow, and can better collect the dust into the dust collecting device 200, thereby improving the dust collecting efficiency of the sander 100. It will be appreciated that the wind force of the rotation of the dust collecting fan 32 forms a negative pressure state in the middle cover 12 through the dust guide ring 42, dust generated by the base plate assembly 4 during polishing is sucked into the dust collecting channel from the dust collecting end 70, the dust enters the wind shield 51 through the dust collecting opening 412 of the base plate 41 under the driving of the rotating air flow generated by the rotation of the dust collecting fan 32, and the dust collecting channel formed by the wind shield 51 and the guiding part 13 guides the dust to be collected into the dust collecting device 200.

In addition, the wind guard 51 is detachably and fixedly connected with the middle cover 12, that is, the dust exhaust channel is formed by fixedly connecting the wind guard 51 with the middle cover 12. Because the sanding machine 100 can generate strong vibration during operation, in order to ensure the stability of the connection between the wind guard 51 and the middle cover 12, the installation posts 514 are protruded on the end surface of the wind guard 51, and the fixing screws are connected to the middle cover 12 after penetrating through the installation posts 514. The mounting posts 514 are disposed around the wind deflector 51 and far away from the position of the flow holes 512, that is, the mounting posts are not disposed in the guiding portion 13, which avoids affecting the flow of the dust discharging channel, so that the dust collection resistance of the sander 100 is increased and the dust collection effect is affected.

Specifically, the wind deflector 51 includes a stop surface 511 connected to the middle cover 12 and a flow hole 512 penetrating the stop surface 511, and the diameter of the flow hole 512 is smaller than the smallest inner diameter of the dust guide ring 42. Through the above arrangement, the chip removal air flow can pass through the flow hole 512 at the maximum dust flow rate after passing through the dust guide ring 42, so as to improve the dust collection efficiency of the whole machine.

Further, the wind guard 51 further includes a guiding portion 513 protruding from the stop surface 511, the guiding portion 513 abuts against the guiding portion 13 to compress the cavity of the dust exhaust channel, and the chip removing airflow can be intensively transferred to the dust collecting device 200.

In addition, the distance from the guide portion 513 to the motor axis L is a first distance, and the curvature of the first distance along the center of the flow hole 512 is gradually increased, that is, the first distance is gradually increased along the preset rotation direction r, and the width of the guide portion 513 in the preset rotation direction r is gradually increased, so that the dust collection resistance is reduced and the dust collection performance is improved when the chip removal airflow circulates along the dust discharge channel. It should be noted that the gradual increase of the curvature refers to an increase according to a certain rule, and the rule may be a linear rule or a nonlinear rule.

Referring to fig. 11 to 14 in combination, the bottom plate 41 has a bottom plate cavity 411 recessed from an end surface and a dust collection opening 412 disposed in a circumferential direction of the bottom plate cavity 411, the dust collection opening 42 is located at the dust collection end 70, the dust guide ring 42 abuts against the dust collection opening 412, and by the above arrangement, dust generated by the sander 100 can directly enter the dust discharge channel after passing through the dust collection channel, so that dust is prevented from splashing and losing everywhere, and dust collection efficiency is improved. Specifically, the diameter of the outer ring of the dust collection port 412 is equal to that of the outer ring of the dust guide ring 42, dust and dust are directly guided into the dust guide ring 42, and the guiding curved surface is optimized, so that the contact surfaces of the dust collection port and the dust guide ring are more attached, the negative pressure of dust collection is increased, and the dust collection efficiency is improved.

The soleplate 41 also has a flow opening 413 adjacent to the suction opening 412, through which opening 413 the exhaust air flow is conveyed to the dust ring 42. Wherein, runner mouth 413 and U-shaped hole 481 switch on each other, and the dust that partly polishes is directly transmitted to dust guide ring 42, and the dust that another part was polished is indirectly transmitted to dust guide ring 42 through the dust absorption passageway, and the dust that produces can be collected fast, has improved the finish on work piece surface, and then improves the work efficiency of polishing the face.

The driving assembly 2 has an eccentric member 23 sleeved on the motor shaft 21, and the eccentric member 23 is eccentrically disposed with respect to the motor shaft 21, and when the motor shaft 21 rotates, the eccentric member 23 can transmit rotation of the motor shaft 21 to rotation and revolution with other parts of the eccentric member 23.

The vibration frame 8 is installed between the middle cover 12 and the bottom plate 41, and is used for limiting the bottom plate 41 to swing within a preset angle range during the movement of the bottom plate 41, so as to prevent the bottom plate 41 from swinging beyond the preset angle and rotating.

Referring to fig. 4, the motor shaft 21 can drive the base plate assembly 4 so that the base plate assembly 4 can swing with respect to the cabinet 1. Specifically, the base plate assembly 4 is fixedly connected to the eccentric 23, that is, the motor shaft 21 transmits power to the base plate assembly 4 through the eccentric 23. Under the drive of the motor shaft 21 and the eccentric member 23, the bottom plate 41 can eccentrically move relative to the motor axis L, and when the bottom plate 41 eccentrically moves, the abrasive paper can continuously rub on the surface of the workpiece to be grinded, so that the functions of grinding, polishing and the like of the workpiece to be grinded are realized.

The base plate assembly 4 further comprises a second bearing 401 mounted on the base plate 41, and the second bearing 401 is used for reducing the friction coefficient of the motor shaft 21 and the eccentric member 23 arranged on the motor shaft 21 during rotation, so as to ensure the rotation precision and parallelism of the motor shaft 21.

During the grinding operation of the sander 100, a large amount of dust is formed, which during the transfer to the dust evacuation channel through the dust ring 42, has a risk of a small portion of the dust leaking into the gap between the dust collection fan 32 and the intermediate cover 12, and a portion of the dust leaking into the second bearing 401, reducing the service life of the second bearing 401.

In this embodiment, the small portion of dust can be blocked by a simple labyrinth dustproof structure. Specifically, the dust collecting fan 32 has a third dust-proof rib 321 protruding from the end surface, the middle cover 12 further has a fourth dust-proof rib 123 protruding from the opposite side to the second dust-proof rib 122, the third dust-proof rib 321 is combined with the fourth dust-proof rib 123, and simultaneously, part of the small dust is blocked by gravity, and the remaining part of the small dust is isolated from the outside by the labyrinth dust-proof structure, so as to prevent the dust from invading into the first bearing 121, thereby prolonging the service life of the first bearing 121.

The dust can be protected by the labyrinth dust-proof combination and the sealing piece 46, so that the dust is prevented from entering the second bearing 401, and the service life of the second bearing is prolonged. Specifically, the dust collecting fan 32 has a mounting plate 322 mounted to the eccentric 23, the mounting plate 322 has a positioning rib 3221 protruding from the end surface, the bottom plate 41 has a first cavity 40 recessed from the end surface, and the positioning rib 3221 is coupled to the first cavity 40. With this arrangement, a large portion of the dust in the portion of the dust is blocked during grinding, while a small portion of the dust passes through the gap between the mounting plate 322 and the bottom plate 41, and the dust is completely blocked from the outside by the seal 46 mounted in the bottom plate 41.

Specifically, referring to fig. 12 in combination, the first cavity 40 is located above the bottom plate cavity 411, the bottom plate assembly 4 further includes a sealing member 46 mounted on the bottom plate 41 and a bottom cover 414 for sealing the bottom plate cavity 411, and the sealing member 46 is filled in the first cavity 40 and abuts against the second bearing 401, so that the risk that dust generated by the sander 100 will enter the second bearing 401 in the bottom plate 41 through the dust collecting fan 32 when passing through the dust discharging channel during the grinding process is avoided.

Further, referring to fig. 8 and 10 in combination, the sealing member 46 includes a base 460 coupled to the inner end surface of the first cavity 40, a first sealing member 461 and a second sealing member 462 protruding along opposite ends of the base, one end of the first sealing member 461 abuts against the mounting plate 321, the other end abuts against the eccentric member 23, and the second sealing member 462 abuts against the inner wall of the first cavity 40. Through the arrangement, the sealing piece 46 can completely seal the first cavity 40, prevent dust from entering the second bearing 401, and prolong the service life of the second bearing 401 and the whole machine.

In addition, as shown in fig. 2, the included angle a formed by the first sealing member 461 and the motor axis L is smaller than or equal to 10 °, and a small interference of a tilt angle is formed to prevent dust from flowing into the second bearing 401 in the gap between the first sealing member 461 and the dust collecting fan 32. In addition, the base plate assembly 4 also has a fastener 47 that engages the seal 46, and the first seal 461 has a channel (not shown) recessed from the periphery to which the fastener 47 is coupled. Through the above structure, on one hand, dust is prevented from penetrating through the gap between the first sealing member 461 and the dust collecting fan 32, and the risk of entering the second bearing 401 after flowing into the gap between the first sealing member 461 and the eccentric member 23 is realized, so that the dust is completely blocked at the position; on the other hand, the rigidity and torsion resistance of the first sealing member 461 are improved to prevent deformation of the first sealing member 461.

It should be noted that, at the minimum point of the small interference, by having the lip member 4611 protruding from the periphery of the first sealing member 461, the lip member 4611 and the groove are disposed along both sides of the first sealing member 461, and the lip member 4611 abuts against the mounting plate 321.

Referring to fig. 13 and 14, the connection line between the center points of the opposite side walls of the bottom plate 41 is formed with dividing lines L1 and L2, which divide the bottom plate into four quadrants, each quadrant including a quarter of the dust collection openings 412, and the dust collection openings 412 are configured as mirror images. Each quadrant includes a quarter of the flow ports 413, and the flow ports 413 are configured in a mirror image distribution. Through the arrangement, the grinding efficiency is improved to the greatest extent while the strength and the rigidity of the bottom plate 41 are not affected, the number of the dust collection openings 412 and the runner openings 413 can be optimally designed to be 4, and the dust collection openings and the runner openings 413 are distributed in a mirror image mode, so that the risk of deformation caused by long-term processing of the bottom plate 41 is avoided.

In addition, all have the first strengthening rib 45 protruding from bottom plate 41 in every quadrant, avoid appearing the risk of bottom plate 41 torsional deformation, satisfy the mechanical properties requirement of bottom plate subassembly 4, and first strengthening rib 45 is configured to mirror image distribution, and a part of first strengthening rib 45 is arranged for parting line L1, L2 slope, improves the rigidity of bottom plate, when reducing the vibration of whole machine, the noise of complete machine has also improved by a wide margin, improves user's use comfort.

Specifically, the first reinforcing rib 45 includes a main reinforcing rib 451 adjacent to the floor cavity 411, and the main reinforcing rib 451 is disposed at one of the dividing lines. The first reinforcing rib 45 further includes a first sub reinforcing rib 452 and a second sub reinforcing rib 453 coupled to the main reinforcing rib 451, and reduces the weight of the bottom plate 41 and saves manufacturing cost after the rigidity requirement of the bottom plate 41 is satisfied.

Further, the first auxiliary reinforcing rib 452 forms an angle β of 45 ° with the main reinforcing rib 451, and the second auxiliary reinforcing rib 453 forms an angle γ of 45 ° with the main reinforcing rib 451. Through the arrangement, the frequency region causing the resonance of the bottom plate 41 can be effectively avoided, the effect of the resonance rigidity of the bottom plate 41 and the rigidity are strongest, and the design is more reasonable and the reliability is higher.

The first sub-bead 452 and the second sub-bead 453 are mirror images of each other along the main bead 451 at the bottom plate 41. Through the arrangement, the first reinforcing ribs 45 on the bottom plate 41 are uniformly distributed, the rigidity of the bottom plate 41 is increased, resonance is effectively eliminated, the stress of the machine shell 1 is more uniform, the whole machine is enabled to run more stably, and the use comfort of a user is improved.

Referring again to fig. 12, the bottom plate 41 further has a bearing cavity 415 between the first cavity 40 and the bottom plate cavity 411, and the second bearing 401 is mounted in the bearing cavity 415, and the diameter of the first cavity 40 is smaller than the diameter of the bearing cavity 415. The outer circumferential wall of the bearing cavity 415 is formed with second reinforcing ribs 4151, and the number of the second reinforcing ribs 4151 is even and uniformly distributed.

The flow passage opening 413 has third reinforcing ribs 4131 connected to the first sub reinforcing ribs 452 and the second sub reinforcing ribs 453, and the third reinforcing ribs 4131 are mirror-image distributed along the main reinforcing ribs 451 at the bottom plate 41, further enhancing the rigidity of the bottom plate 41.

The bottom plate 41 has a stepped portion 416 protruding from the end surface, increasing the overall thickness of the bottom plate 41, improving the strength of the bottom plate 41, and preventing deformation caused by long-time operation. Specifically, the ratio of the step 416 to the bottom surface of the bottom plate 41 is 40% -50%.

The step portion 416 has a rib 4161 protruding from the end surface, and the dust guide ring 42 is coupled to the rib 4161. With the above arrangement, on the one hand, the ribs 4161 serve to strengthen the bottom plate 41; on the other hand, the degree of freedom of the dust guide ring 42 is restricted to ensure that the dust guide ring 42 and the dust suction opening 412 have the largest overlapping area, and the dust flow rate is improved.

Referring to fig. 4 and 5, in the present embodiment, the sander 100 further includes a balancing weight 7 connected to the driving assembly 2, the balancing weight 7 is used for achieving dual balance of mass balance and torque balance of the bottom plate 41, the balancing weight 7 is located between the dust collecting fan 32 and the bottom plate 41 along the direction of the motor axis L, the balancing weight 7 and the eccentric member 23 are detachably and fixedly connected, that is, synchronous movement is formed between the eccentric member 23 and the balancing weight 7, and the balancing weight 7 can rotate around the axis along with the eccentric member 23. The balancing weight 7 is accommodated in the bottom plate cavity 411, the bottom plate assembly 4 is further provided with a bottom cover 414 for blocking the bottom plate cavity 411, and the redundant cavity at the bottom of the balancing weight 7 is compressed by adding the bottom cover 414, so that the effect of reducing noise is achieved, and the harm of noise to surrounding people is reduced. Specifically, the ratio of the height H1 occupied by the bottom cover 414 in the bottom plate cavity 411 to the height H2 of the bottom plate cavity 411 is 20% -30%, the extra cavity is compressed as much as possible in the space travel of the counterweight 7 in the bottom plate cavity 411, and the first reinforcing ribs 45 additionally arranged on the bottom plate are combined, so that the vibration during high-speed rotation in the working process can be further reduced, and the noise is effectively reduced. It should be noted that the ratio of the height H1 occupied by the bottom cover 414 in the bottom plate cavity 411 to the height H2 of the bottom plate cavity 411 may be preferably 25%.

In the present embodiment, the floor assembly 4 has a seal ring 44 located between the floor cavity 411 and the backing plate 43, and the seal ring 44 abuts against the bottom cover 414. By the sealing ring 44, on one hand, the bottom cover 414 is prevented from loosening, and the noise reduction effect is reduced; on the other hand, the sealing ring 44 avoids the risk of dust entering the bottom plate cavity 411, and improves the service life of the whole machine.

Specifically, the bottom cover 414 includes a base plate 4141 connected to the bottom plate cavity 411, and a first connecting portion 4142 and a second connecting portion 4143 recessed from opposite end surfaces of the base plate 4141, wherein the first connecting portion 4142 abuts against the bottom plate cavity 411, and the second connecting portion 4143 abuts against the seal ring 44.

The bottom plate cavity 411 has a third connecting portion 4111 recessed from a peripheral wall, and the substrate 4141 abuts against the third connecting portion 4111 to form a labyrinth structure, so as to efficiently prevent dust, and simultaneously form a sealing space with the bottom plate cavity to isolate noise transmission.

The second connecting portion 4143, the base plate 4141 and the third connecting portion 4111 form a height space 30, and the sealing ring 44 is mounted in the height space 30. Through the arrangement, on one hand, dust leakage from the dust collection opening 412 to the bottom plate cavity 411 is avoided, and on the other hand, the bottom cover 414 is fixed to prevent loosening, form a sealed space and reduce noise.

The bottom cover 414 further has a fitting portion 4144 recessed from the periphery of the base plate 4141, and the bottom plate cavity 411 further has a locking portion 4112 protruding from the third connecting portion 4143, wherein the fitting portion 4144 is coupled to the locking portion 4112.

The ratio of the height H2 of the floor cavity 411 to the height H of the floor 41 is 35% -45%. The working of the balancing weight 7 is not influenced, the height of the whole machine is reduced, the gravity center is moved downwards, vibration is reduced, and the operation comfort and convenience of a user are improved.

The present invention is not limited to the above-described embodiments. Those of ordinary skill in the art will readily appreciate that many alternatives to the sander of the present invention are possible without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims (10)

1. The sander comprises a shell, a driving assembly arranged in the shell, a fan assembly connected with the driving assembly and a bottom plate assembly driven by the driving assembly, wherein the shell comprises a main shell for accommodating the driving assembly and a middle cover connected with the main shell, and the middle cover is positioned between the main shell and the bottom plate assembly; the method is characterized in that: the sanding machine further comprises an air flow element positioned between the middle cover and the bottom plate component, wherein a dust exhaust channel is formed between the air flow element and the middle cover, the bottom plate component comprises a bottom plate connected with the driving component and a dust guide ring arranged between the bottom plate and the air flow element, the driving component drives the fan component to rotate so as to generate chip removal air flow, and the chip removal air flow is transmitted to the dust exhaust channel through the dust guide ring.

2. A sander as set forth in claim 1, wherein: the air flow element is provided with a wind shield positioned between the dust guide ring and the middle cover, the shell also comprises a guide part protruding from the inner wall of the middle cover, and the wind shield is combined with the guide part.

3. A sander as set forth in claim 2, wherein: the dust guide ring is configured into a truncated cone shape, and an included angle formed by the inclined surface and the bottom surface of the dust guide ring is 70-80 degrees.

4. A sander as set forth in claim 3, wherein: the wind shield comprises a stop surface connected with the middle cover and a circulation hole penetrating through the stop surface, and the diameter of the circulation hole is smaller than the minimum inner ring diameter of the dust guide ring.

5. The sander as set forth in claim 4, wherein: the wind deflector further comprises a guide part protruding from the stop surface, and the guide part is abutted to the guide part.

6. The sander as set forth in claim 5, wherein: the driving assembly is provided with a motor axis, the distance from the guide part to the motor axis is a first distance, and the curvature of the first distance along the center of the flow hole is gradually increased.

7. A sander as set forth in claim 3, wherein: the bottom plate has from the sunken bottom plate cavity of terminal surface and set up in the dust absorption mouth of the circumference of bottom plate cavity, the dust guide ring butt in the dust absorption mouth, the outer lane diameter of dust absorption mouth with the outer lane diameter of dust guide ring equals.

8. The sander as set forth in claim 7, wherein: the base plate also has a flow port adjacent to the dust collection port, and the chip removal air flow is transmitted to the dust guide ring through the flow port and the dust collection port.

9. The sander as set forth in claim 8, wherein: the connecting line of the central points of the two opposite side walls of the bottom plate is provided with dividing lines which divide the bottom plate into four quadrants, each quadrant comprises a quarter of the dust collection openings, and the dust collection openings are configured to be in mirror image distribution.

10. A sander as set forth in claim 9, wherein: each of the quadrants includes a quarter of the flow openings and the flow openings are configured as mirror images.