CN102233532A

CN102233532A - Sander

Info

Publication number: CN102233532A
Application number: CN2010101586426A
Authority: CN
Inventors: 钟红风
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: 2011-11-09

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 air enters the fan from the hollow part under the action of the fan and is discharged. The sander can prevent dust from splashing and improve the dust absorption efficiency, and has a simple structure.

Description

Sand grinding machine

Technical Field

The invention relates to a grinding machine, in particular to a grinding machine with a dust suction device.

Background

At present, the sanding machine 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 sander's housing. The sanding machine is also provided with 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 and the like. 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 prior sander is generally provided with a dust collection system. The dust collection system comprises a fan, a dust collection channel and a dust collection bag. The fan is arranged in the sander and used for forming airflow through rotation of the fan to drive dust to move in a certain direction, a plurality of channel openings which are in contact with the sanding surface are designed on a chassis of the sander, the channel openings are connected with one end of a dust collection channel, the other end of the dust collection channel is connected with a dust collection bag arranged outside, and the fan rotates to suck dust generated during working into the dust collection channel and finally discharge the dust collection bag. 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 shell of the grinding machine 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 efficiently absorbing dust.

Another object of the present invention is to provide a sander capable of preventing dust from splashing.

The technical scheme adopted by the invention for solving the problems in the prior art is as follows: a sander, comprising: 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 sanding machine 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 the fan in a fluid mode, the other end of the hollow part faces the surface of a workpiece, and air enters the fan from the hollow part under the action of the fan and then is discharged.

Compared with the prior art, the invention has the beneficial effects that: through the curtain body of setting on the dull polish machine, the dust that escapes when using the dull polish machine to polish workpiece surface is blockked by the curtain body, and the dust is by effectual collection behind the hollow portion along with the air admission curtain body simultaneously, plays the effect that effectively prevents the dust and splash and improve dust collection efficiency, 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 of the motor, and the hollow portion is located between the outer layer and the inner layer.

Preferably, the sand table is provided with a bottom surface, the outer layer is provided with a first bottom end, the inner layer is provided with a second bottom end, and the distance from the first bottom end to the bottom surface of the sand table is smaller than the distance from the second bottom end to the bottom surface of the sand table.

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

Preferably, the hollow portion comprises an upper opening portion in fluid communication with the fan and located within the casing, and a lower opening portion facing the surface of the workpiece, the lower opening portion being adjustable in position relative to the sand table.

Preferably, the motor is provided with an output shaft, and the part of the curtain body outside the machine shell 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 lower opening part, an operator can select a proper position of the lower opening part relative to the sand table according to the requirement, and the sand table is very convenient to use.

Preferably, 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 fan and the sand table, a dust outlet is formed in the position, close to the air outlet of the fan, of the machine shell, and dust enters the inner space from the first dust suction port and then is discharged from the dust outlet under the action of the fan.

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 and the dust suction inner space are formed.

Preferably, the dust outlet is provided with a dust collecting device, and dust escaping from the periphery of the sand table during the operation of the sander enters the hollow part from the lower opening part under the action of the fan, is discharged after reaching the fan from the upper opening part, and is collected in the dust collecting device after passing through the dust outlet.

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 view in partial cross-section 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

41. Outer layer 42, inner layer 43, hollow part

44. Upper opening 45, lower opening 46, flexible region

60. Supporting plate 61, blade 62, cooling fan

231. Hole 411, first bottom 421, second bottom

461. Folding part W

Detailed Description

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

Referring to fig. 1, the sander comprises a casing 1 and a sanding disc 3 located below the casing 1, a motor 2 is disposed inside the casing 1, the motor 2 drives the sanding disc 3 to sand the surface of a workpiece W, the motor 2 has an output shaft 21, 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.

A fan 6 is arranged between the motor 2 and the sanding disc 3 for collecting dust generated during operation of the sander. The fan 6 is a common turbofan and is provided with a support plate 60 and a plurality of blades 61 arranged on the support plate, the support plate 60 of the fan 6 faces the motor 2, the blades 61 face the sand table 3, the end face direction of the fan 6 facing the sand table 3 is an air inlet area, and the circumferential direction of the fan 6 is an air outlet area. An opening 12 is arranged on the casing 1 between the fan 6 and the sand disc 3 and around the circumference of the casing 1, and the curtain body 4 passes through the opening 12 on the casing 1 and extends into the casing 1 below the fan 6, so that the curtain body 4 is communicated with the air inlet area of the fan 6 in a fluid mode. The curtain body 4 extends along the circumferential direction of the machine shell 1 and 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 at least partially arranged around the machine shell 1 and 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 an upper opening part 44 and is communicated with the air inlet area of the fan 6 in a fluid mode, the other end of the hollow part 45 is a lower opening part 45 and faces the surface of the workpiece W, and air enters the hollow part 43 from the lower opening part 45 under the action of the fan 6 and is exhausted from the air outlet area of.

The outer layer 41 of the curtain body 4 has a first bottom end 411, the inner layer 42 has a second bottom end 421, the distance from the first bottom end 411 or the second bottom end 421 to the bottom surface 31 of the sand table 3 is smaller than the thickness of the sand table 3, and the distance from the first bottom end 411 to the bottom surface 31 of the sand table 3 is smaller than the distance from the second bottom end 421 to the bottom surface 31 of the sand table 3, i.e. the first bottom end 411 and the second bottom end 421 have a height difference H. When the sander is used for sanding the surface of the workpiece W, dust escaping from gaps around the sanding disc 3 during the operation of the sander is blocked by the outer layer 41 of the curtain body 4, enters the lower opening part 45 of the curtain body 4 along with air, passes through the hollow part 43, reaches the air inlet area of the fan 6 from the upper opening part 44, and is discharged from the air outlet area of the fan 6, so that the dust does not affect the environment and operators.

The angle range of the curtain body 4 around 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 sand 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 barrier is formed to effectively block dust from splashing and collect dust. The preferred shape of the curtain 4 is skirt shaped to make the sander look more aesthetically pleasing.

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 external air of the sander carries dust through the hollow part 43 of the curtain body 4 in the using process, the outer layer 41 and the inner layer 42 cannot generate forced deformation under the action of the airflow. The curtain body 4 can be integrated with the machine shell 1 or can be separated from the machine shell. The curtain body 4 extends into the casing 1 through the opening 12 of the casing 1, and when the curtain body is integrally arranged, the curtain body can be non-detachably connected to the opening 12 of the casing 1 through a process mode such as using an adhesive or hot melting; when the two parts are separated, they can be connected to the opening 12 of the housing 1 by means of screws, snaps, or other detachable connections known to those skilled in the art.

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 machine shell 1 in an air outlet area 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, reach the fan 6 and then be discharged from the dust outlet 11.

The arrow B indicates a second dust absorption channel, namely a second dust absorption port 13 communicated with the inner space 7 is arranged on the machine shell 1 and close to the sand disc 3, and the second dust absorption port 13 is communicated with the outside at the same time to play a role in circulating the air inside and outside the sander. Dust escaping from the periphery of the sand table 3 during operation can enter the inner space 7 through the second dust suction port 13 and then be discharged through the dust outlet 11.

The dust outlet 11 is connectable to a dust collecting device for collecting dust, here a vacuum cleaner or a dust collecting box. Thus, the dust generated during the operation of the sander enters the inner space 7 through 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 collecting device, and in addition, the dust entering the air inlet area of the fan 6 from the hollow part 43 of the curtain body 4 is also discharged from the dust outlet 11 to enter the dust collecting device under the action of the fan 6, so the dust is discharged out of the sander.

A cooling fan 61 is provided between the fan 6 and the motor 2, and the fan 6 and the cooling fan 61 may be integrally formed or may be provided separately. Air enters the interior of the machine shell 1 from a gap at the upper part of the machine shell 1, passes through the motor 2 and is exhausted from a gap on the machine shell 1 through the cooling fan 61, so that heat generated by the motor 2 during operation is taken away by the air and is exhausted to the outside of the sander through the cooling fan 61.

When a sander is used for sanding the surface of a workpiece, a part of generated dust enters the dust collecting device 5 after entering the inner space 7 from the first dust suction port 33 under the action of a dust collector or a fan 6, meanwhile, a part of dust escapes from the periphery of the sand table 3 and is blocked by the curtain body 4, the dust is blocked between the curtain body 4 and the machine shell 1, air can carry the dust together into the hollow part 43 from the lower opening part 45 of the curtain body 4 under the action of the fan 6 and is discharged from the upper opening part 44, and the dust enters the dust collecting device from the dust outlet 11 under the action of the fan 6, namely, a third dust suction channel indicated by an arrow C. Like this, do not influence the original prerequisite that utilizes fan 6 to come the dust absorption under, the dust is blockked by curtain 4, has prevented that the dust from splashing to the outside of dull polish machine, and this partial dust that overflows is by effectual collection through the hollow portion 43 of curtain 4 again simultaneously, and does not influence the circulation of air to improve the dust absorption effect of dull polish machine, simple structure moreover.

Referring to FIG. 3, there is shown a schematic diagram of another embodiment of the sander of the present invention. The position of the lower opening part 45 of the curtain body 4 relative to the sanding disc 3 is adjustable, one or more flexible regions 46 formed by connecting the folding parts 461 end to end along the folding direction are arranged in the middle of the curtain body 4 outside the machine shell 1 along the axial direction of the output shaft 21, the folding parts 461 are similar to the bending part of a suction pipe commonly used in life, namely the folding parts 461 are corrugated or concave overlapped corrugated, so that the curtain body 4 can be operated to bend or axially extend along the motor 2, and an operator can select a proper position of the lower opening part 45 relative to the sanding disc 3 according to working conditions 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 also 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 communicated with the fan (6) in a fluid mode, the other end of the hollow part faces the surface of a workpiece, and air enters the fan (6) from the hollow part (43) under the action of the fan (6) and then is exhausted.

2. A 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) of the motor (2), and the hollow part (43) is positioned between the outer layer (41) and the inner layer (42).

3. A sander as set forth in claim 2, wherein: the sand table (3) is provided with a bottom surface (31), the outer layer (41) is provided with a first bottom end (411), the inner layer (42) is provided with a second bottom end (421), and the distance from the first bottom end (411) to the bottom surface (31) of the sand table (3) is smaller than the distance from the second bottom end (421) to the bottom surface (31) of the sand table (3).

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

5. A sander as set forth in claim 1, wherein: the hollow portion (43) comprises an upper opening portion (44) and a lower opening portion (45), the upper opening portion (44) is in fluid communication with the fan (6) and is located inside the machine shell (1), the lower opening portion (45) faces the surface of the workpiece, and the position of the lower opening portion (45) relative to the sand table (3) is adjustable.

6. A 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 part, located outside the machine shell, of the curtain body (4) along the axial direction of the output shaft (21).

7. A sander as set forth in claim 6, wherein: the flexible region (46) is formed by connecting a plurality of folded parts (461) end to end.

8. A sander as set forth in one of claims 2 to 7, characterized in that: be equipped with first dust absorption mouth (33) on sand table (3), be equipped with between fan (6) and sand table (3) inner space (7) with first dust absorption mouth (33) intercommunication, the circumference position that casing (1) is close to fan (6) is equipped with out dirt mouth (11), and the dust is discharged from a dirt mouth (11) after getting into inner space (7) from first dust absorption mouth (33) under the effect of fan (6).

9. A sander as set forth in claim 8, 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).

10. A sander as set forth in claim 8, wherein: dust collecting device is installed to dust outlet (11), the frosting machine during operation can be followed from the dust that escapes around sand table (3) under fan (6) the effect by lower open part (45) get into hollow portion (43), and follow discharge behind upper opening portion (44) arrival fan (6), pass through behind dust outlet (11) by be collected in the dust collecting device.