CN102233533B

CN102233533B - Sander

Info

Publication number: CN102233533B
Application number: CN 201010158652
Authority: CN
Inventors: 何明明
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2010-04-21
Filing date: 2010-04-21
Publication date: 2013-03-06
Anticipated expiration: 2030-04-21
Also published as: CN102233533A

Abstract

The invention discloses a sander, which comprises a shell, a motor, a fan, a sanding plate and a curtain body, wherein the motor is accommodated in the shell; the fan is driven by the motor to generate airflow; the sanding plate is arranged below the shell and driven by the motor to polish the surface of a workpiece; and the curtain body is connected to the shell and extends along the circumferential direction of the shell, the curtain body is provided with a hollow part, one end of the hollow part is communicated with the fluid of the fan, the other end of the hollow part faces the surface of the workpiece, and the airflow generated by the fan passes through the hollow part and is blown to the surface of the workpiece, so that an air barrier, at least one part of which encircles the sanding plate, is formed between the curtain body and the surface of the workpiece. The sander can prevent dust from splashing and improve the dust absorption efficiency, and has a simple structure.

Description

Sanding machine

Technical Field

The invention relates to a sander, in particular to a sander with a dustproof device.

Background

At present, the sander is widely applied to sanding of wall surfaces or ground surfaces. The sander has a motor providing a driving force, the motor being connected to the power transmission system and located within the housing of the sander. The sander also comprises a working chassis, the motor is connected with the working chassis through a power transmission system, and the bottom surface of the working chassis is attached with sanding materials such as sand paper. When the polishing machine works, the motor drives the bottom disc to rotate axially around a shaft, the attached abrasive paper can correspondingly rotate, and the surface of a workpiece to be polished is polished, so that the workpiece is smooth and flat.

However, in the actual polishing process, a large amount of dust is generated when the sandpaper and the surface of the workpiece are polished and contacted, and the dust is thrown out to the outside along with the high-speed rotation of the working chassis, so that the sight of an operator is influenced by the splashed dust, and the working efficiency is reduced. Moreover, a large amount of dust is inhaled into the body by the respiratory system of the operator, which affects the health of the operator and causes great harm to the body. Therefore, the existing sanding machines are generally provided with a dust suction system. The dust collection system comprises a fan, a dust collection channel and a dust collection bag. The fan sets up in the inside of grinder, and its effect forms the air current through the fan rotation and drives the dust to a certain direction motion, designs the passageway opening of a plurality of and the surface contact of polishing on the chassis of grinder, and the one end of dust absorption passageway is connected to these passageway openings, and the dust bag of peripheral hardware is connected to the other end of dust absorption passageway, and the fan rotates, inhales the dust absorption passageway with the dust that the during operation produced and arranges into the dust bag at last. And after the operation is finished, uniformly treating the dust.

However, such a dust suction method also has disadvantages. Although most of the dust can be sucked away by the dust suction system, part of the dust can escape from gaps around the chassis, and the operator is affected. In this regard, an improvement is disclosed, for example, in U.S. Pat. Nos. 4381628 and 4616449. The annular baffle is arranged on the sanding machine shell at the periphery of the working chassis, and the baffle can effectively block the dust which is splashed outwards. However, the baffle also blocks air from entering the dust collection channel from the outside, which affects air circulation, reduces dust collection efficiency as a whole, and the actual dust collection effect is not ideal.

Disclosure of Invention

The invention aims to provide a sander capable of preventing dust from splashing.

Another object of the present invention is to provide a sanding machine that can efficiently remove dust.

The technical scheme adopted by the invention for solving the problems in the prior art is as follows: a sander comprises a housing; the motor is accommodated in the shell; a fan driven by the motor to generate an air flow; the sand disc is arranged below the shell and is driven by a motor to polish the surface of the workpiece; the sander further comprises a curtain body connected to the machine shell and extending along the circumferential direction of the machine shell, the curtain body is provided with a hollow part, one end of the hollow part is communicated with a fan in a fluid mode, the other end of the hollow part faces the surface of the workpiece, and airflow generated by the fan passes through the hollow part and blows towards the surface of the workpiece, so that an air barrier at least partially surrounding the sand disc is formed between the curtain body and the surface of the workpiece.

Compared with the prior art, the invention has the beneficial effects that: through the curtain body of setting on the grinder, form gaseous barrier between curtain body and workpiece surface when using the grinder to polish workpiece surface, can play the effect that effectively prevents the dust and splash, simple structure moreover.

Preferably, the motor has an output shaft, the curtain body is at least partially disposed around the housing, the curtain body includes an outer layer and an inner layer radially disposed along the output shaft, and the hollow portion is located between the outer layer and the inner layer.

Preferably, the curtain body is detachably connected to the machine shell.

Preferably, the motor has an output shaft having an axis, the gas barrier being parallel to the axis of the output shaft.

Preferably, the hollow portion comprises an inlet portion in fluid communication with the fan and an outlet portion facing the surface of the workpiece, the position of the outlet portion relative to the sanding disc being adjustable.

Preferably, the abrasive disc has a bottom surface to which sandpaper is attached, and the outlet portion is spaced from the bottom surface of the abrasive disc by a distance greater than the thickness of the abrasive disc.

Preferably, the motor is provided with an output shaft, and the curtain body is provided with a flexible area along the axial middle part of the output shaft.

Preferably, the flexible region is composed of a plurality of folded parts which are connected end to end.

By arranging the adjustable outlet part, an operator can select a proper position of the outlet part relative to the sand table according to the requirement, and the sand table is very convenient to use.

Preferably, a dust suction fan for collecting dust is arranged between the fan and the sand table, a first dust suction port is formed in the sand table, an inner space communicated with the first dust suction port is formed between the dust suction fan and the sand table, a dust outlet is formed in the position, adjacent to the dust suction fan, of the machine shell, and the dust suction fan is driven by the motor to enable dust to enter the inner space from the first dust suction port and then be discharged from the dust outlet.

Preferably, a second dust suction port is formed in the position, close to the sand table, of the machine shell, and the second dust suction port is communicated with the inner space.

Through setting up the second dust absorption mouth on the casing, can be with the effectual collection of dust that is blockked by the gas barrier, improved dust collection efficiency.

Drawings

The above objects, aspects and advantages of the present invention will become apparent from the following detailed description of specific embodiments, which is to be read in connection with the accompanying drawings.

The same reference numbers and symbols in the drawings and the description are used to indicate the same or equivalent elements.

Fig. 1 is a schematic partial cross-sectional view of a sander according to the present invention.

Fig. 2 is a partial cross-sectional view of the sander of the present invention taken along line a-a of fig. 1.

Fig. 3 is a schematic view of another embodiment of the sander of the present invention.

Wherein,

1. casing 2, motor 3, sand table

4. Curtain body 6, fan 7, dust absorption channel

11. Dust outlet 12, opening 13 and second dust suction port

21. Output shaft 23, connecting piece 25, first eccentric shaft

26. Second eccentric shaft 31, bottom 32, sandpaper

33. First dust suction port 35, first sand table 36 and second sand table

40. Gas barrier 41, outer layer 42, inner layer

43. Hollow part 44, inlet part 45, outlet part

46. Flexible zone 60, support plate 61, blade

62. Dust exhausting fan 231, hole 461, folding part

W. workpiece

Detailed Description

The present disclosure discloses a sander, and is described with reference to specific embodiments.

Referring to fig. 1, the sander includes a housing 1 and a sanding disc 3 located below the housing 1, a motor 2 is disposed inside the housing 1, the motor 2 drives the sanding disc 3 to sand a surface of a workpiece W, the motor 2 has an output shaft 21, the output shaft 21 has an axis X, a fan 6 is mounted on the output shaft 21, and the fan 6 can generate an air flow under the driving of the motor 2.

The sanding disc 3 has a bottom surface 31 with replaceable sandpaper 32 attached to the bottom surface 31. In operation, the sandpaper 32 is driven by the sanding disc 3 to act on the surface of the workpiece W for sanding and sanding, and a large amount of dust is generated.

The fan 6 is arranged between the motor 2 and the sand table 3, the fan 6 is a common turbofan, the support plate 60 is arranged, and the blades 61 are arranged on the support plate, the support plate 60 of the fan 6 faces the sand table 3, the blades 61 face the motor 2, the end face direction of the fan 6 facing the motor 2 is an air inlet area, the circumference of the fan 6 is an air outlet area, an opening 12 is arranged at the air outlet area of the fan 6 on the machine shell 1, the opening 12 surrounds the fan 6, air enters the machine shell 1 from the gap at the upper part of the machine shell 1, passes through the motor 2 and then is discharged from the opening 12 on the machine shell 1 through the fan 6, in this way, heat generated when the motor 2 works is taken away by the air and is discharged to the outside of the sander through the fan 6, and the fan 6 can.

The fan 6 may be disposed at an upper portion of the motor, and air enters the interior of the cabinet 1 through a gap at a lower portion of the cabinet 1, passes through the motor 2, and is discharged through a gap at an upper portion of the cabinet 1. Of course, the fan 6 may be a dedicated fan separately provided not for cooling the motor, and its position within the housing 1 may be set as desired.

The curtain body 4 is connected with the opening 12 on the machine shell 1, the curtain body 4 is at least partially arranged around the circumference of the machine shell 1 and comprises an outer layer 41 and an inner layer 42 which are distributed along the radial direction of the output shaft 21 of the motor 2, a hollow part 43 is formed between the outer layer 41 and the inner layer 42, one end of the hollow part 43 is communicated with the air outlet area of the fan 6 in a fluid mode, the other end of the hollow part is towards the surface of the workpiece W, namely one end of the hollow part 43 adjacent to the air outlet area of the fan 6 is an inlet part 44, one end of the hollow part towards the surface of the workpiece W is an outlet part 45, the inlet part 44 is connected with the opening 12 of the machine shell 1, thus the air flow exhausted from the fan 6 enters the inlet part 44 of the curtain body 4 from the opening 12 and then is exhausted from the outlet part 45, the outlet part 45 is arranged between the opening 12 of the machine shell 1 and the bottom surface 31 of, thus forming a gas barrier 40 at least partially around the sanding disc 3 between the outlet opening 45 and the surface of the work piece W, dust escaping from gaps around the sanding disc 3 during operation of the sanding machine is blocked by the gas barrier 40, so that dust does not have an influence on the environment and the operator.

The angle range of the curtain body 4 surrounding the machine shell 1 along the circumferential direction of the machine shell 1 is at least larger than or equal to 180 degrees, and the curtain body 4 is positioned on the sander and close to an operator, so that at least dust escaping from gaps around the sanding disc 3 when the sander works can be ensured not to affect the operator. Of course, preferably between 270 and 360 degrees, so that a wider range of gas barriers 40 can be formed to effectively block dust splashing. The preferred shape of the curtain 4 is skirt-like to make the sander look more aesthetically pleasing.

The outlet part 45 of the hollow part 43 of the curtain body 4 faces the surface of the workpiece W, and the gas barrier 40 formed by blowing the gas flow passing through the hollow part 43 to the surface of the workpiece W under the guiding action of the outlet part 45 is approximately parallel to the axis X of the output shaft 21, so that the distance of the gas barrier 40 along the axial direction of the output shaft 21 is shortest, thereby reducing the gas flow loss and enabling the gas barrier 40 to more effectively block dust escaping from gaps around the sand table 3. The distance of the outlet part 45 from the bottom surface 31 of the sand table 3 is at least greater than the thickness of the sand table 3, so that an effective gas barrier between the outlet part 45 and the workpiece surface is ensured without affecting the air circulation.

The thickness of the outer layer 41 and the inner layer 42 of the curtain body 4 is approximately equal to that of the machine shell 1, or is smaller than that of the machine shell 1, and as long as the thickness of the outer layer 41 and the inner layer 42 is enough that the air discharged from the fan 6 during the use process of the sander flows through the hollow part 43 of the curtain body 4, the outer layer 41 and the inner layer 42 are not deformed under the action of the air flow. The curtain body 4 can be integrated with the machine shell 1 or can be separated from the machine shell. The curtain body 4 is connected to the machine shell 1 corresponding to the opening 12 of the machine shell 1 through the inlet part 44, and when the curtain body is integrally arranged, the curtain body can be connected to the machine shell 1 in a non-detachable mode through using an adhesive or a hot melting mode and the like; when the two components are separately arranged, they can be connected to the housing 1 by means of detachable connection methods known to those skilled in the art, such as screws and buckles.

Referring to fig. 2, the sand table 3 includes a first sand table 35 driven by a first eccentric shaft 25 connected to the output shaft 21, and a second sand table 36 driven by a second eccentric shaft 26 connected to the output shaft 21, the first sand table 35 is coupled to the first eccentric shaft 25 by a coupling member 23, a plurality of holes 231 are formed in the coupling member 23, and a first dust suction port 33 is formed between the first sand table 35 and the second sand table 36. Fig. 2 shows a double-disc sander, and a conventional sander has an eccentric shaft-driven sanding disc attached to an output shaft 21, and the bottom surface 31 of the sanding disc is provided with a plurality of first dust suction ports 33, and the first dust suction ports 33 penetrate the sanding disc 3 in a direction perpendicular to the bottom surface 31 of the sanding disc 3.

Arrow A indicates a first dust suction channel, and the first dust suction port 33 is tightly attached to the surface of the workpiece, so that dust generated during working can be sucked conveniently. An inner space 7 is arranged between the sand disc 3 and the fan 6, the inner space 7 forms a fluid communication space through holes on the connecting piece 23, the first dust suction port 33 is communicated with the inner space 7, a dust outlet 11 is arranged on the 231 casing 1 between the sand disc 3 and the fan 6 and adjacent to the fan 6, and dust generated in operation can enter the inner space 7 from the first dust suction port 33, pass through the holes 231 on the connecting piece 23 and reach the fan 6 and then is discharged from the dust outlet 11.

Arrow B indicates the second dust absorption passageway, and the department on casing 1 and near sand table 3 is equipped with the second dust absorption mouth 13 with inside space 7 intercommunication, and second dust absorption mouth 13 communicates the external world simultaneously, plays the circulation effect of the interior outside air of grinder. Dust escaping from the periphery of the sand table 3 during operation can enter the inner space 7 from the second dust suction opening 13 and reach the fan 6 and then be discharged from the dust outlet 11.

The dust outlet 11 is connectable to a dust collecting device for collecting dust, here a vacuum cleaner. Dust generated during the operation of the sander enters the inner space 7 from the first dust suction port 33 or the second dust suction port 13, the second dust suction port 13 simultaneously provides air necessary for sucking the dust from the first dust suction port 33 or the second dust suction port 13, the dust passes through the inner space 7 and then is discharged from the dust outlet 11 to enter the dust collector, and the dust is discharged out of the sander.

If the dust collector is not arranged, a dust collection fan 62 driven by the motor 2 can be arranged between the fan 6 and the sand table 3, the inner space 7 is arranged between the sand table 33 and the dust collection fan 62, the fan 6 and the dust collection fan 62 can be separately arranged, or the dust collection fan and the dust collection fan can be integrally arranged, namely, the upper surface and the lower surface of the fan 6 are both provided with blades, one surface facing the sand table 3 is the dust collection fan 62, and the other surface facing the motor 2 is the cooling fan 6 for cooling the motor. When the dust collecting device works, the dust collecting fan 62 is driven by the motor 2 to generate wind power, the wind power enables dust generated during the work to be sucked from the first dust suction port 33 or the second dust suction port 13 and enter the inner space 7, the second dust suction port 13 simultaneously provides air necessary for sucking the dust from the first dust suction port 33 or the second dust suction port 13, and the dust passes through the inner space 7 and then is discharged from the dust outlet 11 and enters the dust collecting device, wherein the dust collecting device is a dust collecting box. The dust is thus discharged outside the sander.

When the sanding machine is used for sanding the surface of a workpiece, a part of generated dust enters the dust collecting device after entering the inner space 7 from the first dust suction port 33 under the action of a dust collector or a dust exhaust fan 62, meanwhile, a part of the dust escapes from the periphery of the sand tray 3 and is blocked by the air barrier 40 formed by the air flow exhausted from the hollow part 43, the dust is blocked between the curtain body 4 and the air barrier 40 and the machine shell 1, and a part of the air flow exhausted from the hollow part 43 reaches the working surface and then flows to the machine shell 1, so that the air can carry the dust together to enter the inner space 7 from the second dust suction port 13 on the machine shell 1 and then enters the dust collecting device 5. Like this, under the prerequisite that does not influence original utilization dust catcher or dust absorption fan 62 come the dust absorption, the dust is blockked by the gas barrier 40 that fan 6 exhaust gas flow formed, has prevented that the dust from splashing the outside of grinder, and this partial dust that overflows is by effectual collection again simultaneously, and does not influence the circulation of air again to the dust absorption effect of grinder has been improved, simple structure moreover.

Referring to fig. 3, the position of the outlet 45 relative to the sanding disc 3 may also be adjustable, and the curtain 4 is provided with one or more flexible regions 46 formed by connecting the folded portions 461 end to end along the axial direction of the motor 2, where the folded portions 461 are similar to the folded portions of a common suction pipe in life, that is, the folded portions 461 are corrugated or concave overlapping corrugations, so that the curtain 4 can be operated to bend or stretch along the axial direction of the motor 2, so that the gas barrier 40 formed by the gas flow passing through the hollow portion 43 blowing toward the surface of the workpiece under the guiding action of the outlet 45 can be vertical or inclined relative to the surface of the workpiece, and then the operator can select a proper position of the outlet 45 relative to the sanding disc 3 when using the sanding machine. Of course, the flexible region 46 of the curtain 4 may be constructed of other structures known to those skilled in the art, such as plastic, bendable foil, etc.

The above-described examples are merely provided as the most preferred embodiments for those skilled in the art to understand the present invention. The invention is not limited to the specific embodiments described above. Any modifications readily attainable by one versed in the art are to be included within the scope of the present invention.

Claims

1. A sander, comprising:

a housing (1);

the motor (2) is accommodated in the shell (1);

a fan (6) driven by the motor (2) to generate an air flow;

the sand disc (3) is arranged below the machine shell (1) and is driven by the motor (2) to polish the surface of the workpiece;

the method is characterized in that: the sander further comprises a curtain body (4) connected to the machine shell (1) and extending along the circumferential direction of the machine shell (1), the curtain body (4) is provided with a hollow part (43), one end of the hollow part (43) is in fluid communication with the fan (6), the other end of the hollow part faces the surface of a workpiece, and airflow generated by the fan (6) passes through the hollow part (43) and blows towards the surface of the workpiece, so that an air barrier (40) at least partially surrounding the sand disc (3) is formed between the curtain body (4) and the surface of the workpiece.

2. The sander as set forth in claim 1, wherein: the motor (2) is provided with an output shaft (21), the curtain body (4) is at least partially arranged around the machine shell (1), the curtain body (4) comprises an outer layer (41) and an inner layer (42) which are distributed along the radial direction of the output shaft (21), and the hollow part (43) is positioned between the outer layer (41) and the inner layer (42).

3. The sander as set forth in claim 1, wherein: the curtain body (4) is detachably connected to the machine shell (1).

4. The sander as set forth in claim 1, wherein: the motor (2) has an output shaft (21), the output shaft (21) has an axis, and the gas barrier (40) is parallel to the axis of the output shaft (21).

5. The sander as set forth in claim 1, wherein: the hollow portion (43) comprises an inlet portion (44) and an outlet portion (45), the inlet portion (44) being in fluid communication with the fan (6), the outlet portion (45) being directed towards the surface of the workpiece, the position of the outlet portion (45) relative to the sand table (3) being adjustable.

6. The sander as set forth in claim 5, wherein: the sand table (3) is provided with a bottom surface (31) connected with sand paper (32), and the distance from the outlet part (45) to the bottom surface (31) of the sand table (3) is larger than the thickness of the sand table (3).

7. The sander as set forth in claim 5, wherein: the motor (2) is provided with an output shaft (21), and a flexible area (46) is arranged in the middle of the curtain body (4) along the axial direction of the output shaft (21).

8. The sander as set forth in claim 7, wherein: the flexible region (46) is formed by connecting a plurality of folded parts (461) end to end.

9. The sander according to one of claims 2 to 8, wherein: be provided with dust absorption fan (62) between fan (6) and sand table (3), be equipped with first dust absorption mouth (33) on sand table (3), be equipped with between dust absorption fan (62) and sand table (3) inner space (7) with first dust absorption mouth (33) intercommunication, the position that casing (1) is close to dust absorption fan (62) is equipped with dust outlet (11), and dust absorption fan (62) are driven by motor (2) so that the dust is discharged from dust outlet (11) after entering inner space (7) from first dust absorption mouth (33).

10. The sander as set forth in claim 9, wherein: a second dust suction port (13) is formed in the position, close to the sand disc (3), of the machine shell (1), and the second dust suction port (13) is communicated with the inner space (7).