CN102233532A - sander - Google Patents

Abstract

The invention discloses a sand grinder, 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. The sand grinder can prevent dust from splashing, improve dust collection efficiency and has a simple structure.

Description

sander

technical field

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

Background technique

At present, sanding machines are widely used in the grinding and sanding of walls or floors. The sander has a motor that provides the driving force, the motor is connected to the power transmission system and is located within the housing of the sander. The grinding machine also has a working chassis, the motor is connected with the working chassis through a power transmission system, and abrasive materials such as sandpaper are attached to the bottom surface of the working chassis. When working, the motor drives the chassis to rotate axially around an axis, and the attached sandpaper will rotate accordingly to polish the surface of the workpiece to be polished so as to make it smooth and flat. the

However, in the actual grinding process, a large amount of dust will be generated when the sandpaper is in contact with the surface of the workpiece, and the dust will be thrown out to the outside with the high-speed rotation of the working chassis, so the splashed dust will affect the operator's sight and reduce the work efficiency. What's more, a large amount of dust is sucked into the body by the operator's respiratory system, which affects the health of the operator and causes great harm to his body. Therefore, the current grinding machines are generally equipped with a vacuum system. The dust collection system includes a fan, a suction channel and a dust bag. The fan is installed inside the grinding machine, and its function is to drive the dust to move in a certain direction through the rotation of the fan to form an airflow. Several channel openings that are in contact with the grinding surface are designed on the chassis of the grinding machine. These channel openings are connected to one end of the dust suction channel. The other end of the dust suction channel is connected to the dust bag of the peripheral device, and the fan rotates to suck the dust generated during work into the dust suction channel and finally discharge it into the dust bag. After the work is completed, the dust will be treated uniformly. the

However, this vacuuming method also has disadvantages. Although most of the dust can be sucked away by the above-mentioned dust suction system, some dust will escape from the gaps around the chassis and affect the operator. To this end, as US Patent No. 4,381,628 and US No. 4,616,449 disclose a kind of improvement means. An annular baffle is arranged on the shell of the grinding machine around the working chassis, and the baffle can effectively block the dust splashed outward. However, the baffle also blocks the air from entering the dust collection channel from the outside at the same time, which affects the air circulation, reduces the dust collection efficiency as a whole, and the actual dust collection effect is not ideal. the

Contents of the invention

The object of the present invention is to provide a sander capable of efficiently collecting dust. the

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

The technical solution adopted by the present invention to solve the problems of the prior art is: a sander, comprising: a casing; a motor housed in the casing; a fan that is driven by the motor to generate air flow; it is arranged under the casing A sand disc for grinding the surface of the workpiece driven by a motor; the sander also includes a curtain body connected to the casing and extending along the circumferential direction of the casing, the curtain body has a hollow part, and one end of the hollow part is in fluid communication with the fan , the other end 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

Compared with the prior art, the beneficial effect of the present invention is: through the curtain body arranged on the sander, the dust escaping when the sander is used to grind the surface of the workpiece is blocked by the curtain body, and at the same time, the dust enters the curtain body along with the air The hollow part of the dust collector is effectively collected, which effectively prevents dust from splashing and improves dust collection efficiency, and has a simple structure. the

Preferably, the motor has an output shaft, the curtain body is at least partially arranged around the casing, the curtain body includes an outer layer and an inner layer radially distributed along the output shaft of the motor, and the hollow part is located in the outer layer and the inner layer between. the

Preferably, the sand tray has a bottom surface, the outer layer has a first bottom end, the inner layer has a second bottom end, and the distance from the first bottom end to the bottom surface of the sand tray is smaller than the distance from the second bottom end to the bottom surface of the sand tray. The distance from the bottom of the sand tray. the

Preferably, the curtain body is detachably connected to the casing. the

Preferably, the hollow part includes an upper opening and a lower opening, the upper opening is in fluid communication with the fan and is located in the housing, the lower opening is facing the surface of the workpiece, and the lower opening is opposite to the sand table The position is adjustable. the

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

Preferably, the flexible region is composed of several folding parts connected end to end. the

By providing an adjustable lower opening, the operator can select a suitable position of the lower opening relative to the sand table according to needs, which is very convenient to use. the

Preferably, the sand tray is provided with a first dust suction port, an internal space communicating with the first dust suction port is provided between the fan and the sand table, and an air outlet is provided on the casing adjacent to the air outlet of the fan. Dust outlet, dust is discharged from the dust outlet after entering the inner space from the first dust suction inlet under the action of the fan. the

Preferably, a second dust suction port is provided at a position close to the sand table on the casing, and the second dust suction port is connected with the dust suction inner space. the

Preferably, the dust outlet is equipped with a dust collecting device, and the dust escaping from the surroundings of the sand table when the sander is in operation enters the hollow part from the lower opening under the action of the fan, and is discharged from the upper opening. After reaching the fan, it is discharged, and then collected in the dust collecting device after passing through the dust outlet. the

Description of drawings

The purpose, technical solutions and beneficial effects of the present invention described above can be clearly obtained through the following detailed description of the specific embodiments capable of realizing the present invention, combined with the description of the accompanying drawings. the

The same reference numerals and symbols are used in the drawings and the specification to denote the same or equivalent elements. the

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

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

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

in,

1. Chassis 2. Motor 3. Sand table

4. Curtain body 6. Fan 7. Dust suction channel

11. Dust outlet 12. Opening 13. Second suction port

21. Output shaft 23. Connecting piece 25. First eccentric shaft

26. Second eccentric shaft 31. Bottom surface 32. Sandpaper

33. The first suction port 35. The first sand tray 36. The second sand tray

41. Outer layer 42. Inner layer 43. Hollow part

44. Upper opening 45. Lower opening 46. Flexible area

60. Support plate 61. Blade 62. Cooling fan

231. Hole 411. First Bottom 421. Second Bottom

461. Folding Department W. Workpiece

Detailed ways

The disclosure of the present invention discloses a grinding machine, which will now be described with specific embodiments. the

Please refer to shown in Fig. 1, sanding machine comprises casing 1 and be positioned at casing 1 below sanding disc 3, is provided with motor 2 inside casing 1, and motor 2 drives sanding disc 3 to polish the surface of workpiece W, and motor 2 has output The shaft 21 is equipped with a fan 6 on the output shaft 21, and the fan 6 can generate air flow under the drive of the motor 2. the

The sand tray 3 has a bottom surface 31 , and a replaceable sandpaper 32 is attached to the bottom surface 31 . During work, the sandpaper 32 acts on the surface of the workpiece W under the drive of the sand disc 3 for grinding and sanding, while producing a large amount of dust. the

The fan 6 is arranged between the motor 2 and the sand disc 3, and is used to collect the dust generated when the sander works. The fan 6 is a common turbo fan, with a support plate 60 and several 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 tray 3, and the fan 6 faces the end face direction of the sand tray 3 It is the air inlet area, and the circumferential direction of the fan 6 is the air outlet area. The casing 1 is located between the fan 6 and the sand tray 3 and is provided with an opening 12 around the circumference of the casing 1. The curtain body 4 passes through the opening 12 on the casing 1 and extends into the casing 1 and is located below the fan 6. The curtain body 4 is thus in fluid communication with the air inlet area of the fan 6 . The curtain body 4 extends along the circumferential direction of the casing 1 and is arranged at least partially around the casing 1. The curtain body 4 includes an outer layer 41 and an inner layer 42 arranged at least partially around the casing 1 and radially distributed along 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 44 in fluid communication with the air inlet area of the fan 6, and the other end is a lower opening 45 facing the surface of the workpiece W. Under action, it enters the hollow portion 43 from the lower opening 45 and reaches the air inlet area of the fan 6 from the upper opening 44 , and then is discharged from the air outlet area of the fan 6 . the

The outer layer 41 of the curtain body 4 has a first bottom end 411, and the inner layer 42 has a second bottom end 421, and the distance from the first bottom end 411 or the second bottom end 421 to the bottom surface 31 of the sand tray 3 is less than the thickness of the sand tray 3, And the distance from the first bottom end 411 to the bottom surface 31 of the sand tray 3 is smaller than the distance from the second bottom end 421 to the bottom surface 31 of the sand tray 3 , that is, the first bottom end 411 and the second bottom end 421 have a height difference H. In this way, when the sander is used to grind the surface of the workpiece W, the dust that escapes from the gaps around the sand disc 3 during the work of the sander is blocked by the outer layer 41 of the curtain body 4, and the dust enters the lower opening of the curtain body 4 along with the air. 45, through the hollow part 43 from the upper opening 44 to the air inlet area of the fan 6 and then discharged from the air outlet area of the fan 6, so that the dust will not affect the environment and the operator. the

The angle range of the curtain body 4 around the casing 1 along the circumference of the casing 1 is at least greater than or equal to 180 degrees, and the curtain body 4 is located on the sander adjacent to the operator's position, so that at least it can ensure that the sander 3 can be viewed from the surroundings of the sand table 3 when the sander is working. The dust escaping from the gap will not affect the operator. Of course, it is best to be between 270 degrees and 360 degrees, so as to form a larger barrier, effectively prevent dust from splashing and collect dust. The preferred shape of the curtain body 4 is a skirt, so that the sander looks more beautiful. the

The thickness of the outer layer 41 and the inner layer 42 of the curtain body 4 is roughly equivalent to the thickness of the casing 1, or less than the thickness of the casing 1, and as long as the thickness of the outer layer 41 and the inner layer 42 meets the external requirements of the sander during use. The air carries the dust through the hollow part 43 of the curtain body 4, and the outer layer 41 and the inner layer 42 need not be deformed by force under the action of the airflow. The curtain body 4 can be set integrally with the casing 1 or can be set separately. The curtain body 4 protrudes into the inside of the casing 1 through the opening 12 of the casing 1. When it is integrally arranged, it can be non-detachably connected to the opening 12 of the casing 1 by using adhesives or hot-melt processes; During installation, it can be connected to the opening 12 on the casing 1 by a detachable connection known to those skilled in the art, such as screws and buckles. the

With reference to Fig. 2, emery disc 3 comprises the first emery disc 35 driven by the first eccentric shaft 25 that is connected on the output shaft 21, and the second emery disc 36 that is driven by the second eccentric shaft 26 that is connected on the output shaft 21 , the first sand disc 35 is matched with the first eccentric shaft 25 through a connecting piece 23, and the connecting piece 23 is provided with several holes 231, and a first dust suction device is provided between the first sand disc 35 and the second sand disc 36. Mouth 33. What Fig. 2 shows is a kind of double-disc sander, common sander has a sand disc driven by an eccentric shaft connected on the output shaft 21, and the bottom surface 31 of the sand disc is provided with the first suction port 33. There are several first dust suction ports 33, which penetrate the sand tray 3 in a direction perpendicular to the bottom surface 31 of the sand tray 3. the

The arrow A indicates the first dust suction channel, and the first dust suction port 33 is close to the surface of the workpiece, which is convenient for inhaling the generated dust during work. An internal space 7 is provided between the sand tray 3 and the fan 6, and the hole on the connecting piece 23 makes the internal space 7 form a fluid-communicated space, the first dust suction port 33 communicates with the internal space 7, and the casing 1 is adjacent to the fan. The air outlet area of 6 is provided with dust outlet 11, and the dust that produces during work can enter interior space 7 from the first dust suction port 33 and arrive at fan 6 through the hole 231 on the connector 23 and then be discharged from dust outlet 11. the

Arrow B refers to the second dust suction channel, that is, the second dust suction port 13 connected with the internal space 7 is provided on the casing 1 and close to the sand table 3, and the second dust suction port 13 is connected to the outside world at the same time to play a role The circulation of air inside and outside the sander. The dust that escapes from around the sand tray 3 during work can enter the inner space 7 from the second dust suction port 13 and then be discharged from the dust outlet 11. the

The dust outlet 11 can be connected with a dust collection device for collecting dust, where the dust collection device is a vacuum cleaner or a dust collection box. Dust produced when the sander works like this enters the interior space 7 from the first dust suction port 33 or the second dust suction port 13, and the second dust suction port 13 provides suction from the first dust suction port 33 or the second dust suction port 13 simultaneously. The air necessary for dust removal, the dust passes through the inner space 7, and then is discharged from the dust outlet 11 to enter the dust collection device. In addition, the dust that enters the air inlet area of the fan 6 from the hollow part 43 of the curtain body 4 passes through the fan 6 Under the action of the dust is also discharged from the dust outlet 11 into the dust collection device, so that the dust is discharged outside the sander. the

Cooling fan 61 is arranged between fan 6 and motor 2, and fan 6 and cooling fan 61 can be integrally formed, also can be provided separately. The air enters the interior of the casing 1 from the upper gap of the casing 1, passes through the motor 2, and then is discharged from the gap on the casing 1 through the cooling fan 61, so that the heat generated by the motor 2 is taken away by the air and discharged to the Sander exterior. the

When using a sander to grind the surface of a workpiece, part of the generated dust enters the inner space 7 from the first dust suction port 33 under the action of the vacuum cleaner or the fan 6 and then enters the dust collecting device 5, while a part of the dust escapes from around the sand table 3 Blocked by the curtain body 4, the dust is blocked between the curtain body 4 and the casing 1, and the air will carry the dust into the hollow part 43 from the lower opening 45 of the curtain body 4 under the action of the fan 6 and then pass through the upper opening. 44 is discharged, and enters the dust collection device from the dust outlet 11 under the action of the fan 6, that is, the third dust suction channel indicated by the arrow C. In this way, under the premise of not affecting the original use of the fan 6 to absorb dust, the dust is blocked by the curtain body 4, preventing the dust from splashing to the outside of the sander, and at the same time, this part of the escaping dust passes through the hollow part 43 of the curtain body 4 It is effectively collected without affecting the circulation of the air, thereby improving the dust collection effect of the sander, and the structure is simple. the

Referring to Fig. 3, it is a schematic diagram of another embodiment of the sander of the present invention. The position of the lower opening 45 of the curtain body 4 relative to the sand table 3 is adjustable. The curtain body 4 is located in the middle of the outer casing 1 along the axial direction of the output shaft 21 and is provided with one or more folding parts 461 along the folding direction. The flexible area 46 composed of end-to-end connection, the folding part 461 here is similar to the bending part of the common straw in daily life, that is, the folding part 461 is corrugated and undulating folds, or concave overlapping undulating folds, so that the curtain body 4 can be operated If it is bent or stretched axially along the motor 2, the operator can choose an appropriate position of the lower opening 45 relative to the sand disc 3 according to the working conditions when using the sander. Of course, the flexible area 46 of the curtain body 4 can also be made of other structures known to those skilled in the art, such as plastic plastics, bendable metal sheets and the like. the

The above-mentioned embodiments are only the most preferred implementation modes provided for those skilled in the art to understand the present invention. The present invention is not limited to the specific examples described above. Any improvements that are easily conceivable by those skilled in the art are within the inventive concept of the present invention. the

Claims (10)

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.

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