KR20210026998A - Electric orbital sander - Google Patents

Abstract

The present invention is to provide an electric polisher which prevents heat rise of an electrically driven motor and a motor cover plate bearing to cool them by sucking the heat generated from the electrically driven motor by means of dust collection of a dust collector during a polishing process through one or more holes penetrating through upper and lower parts of a lower cover plate. To achieve the purpose, the electric polisher according to the present invention comprises: the electrically driven motor seated within a housing to rotate by electricity; an upper and a lower cover plate forming an upper and a lower part of the electrically driven motor to fixate the electrically driven motor and protecting the inside of the electrically driven motor; a motor cover plate bearing seated in the upper and the lower cover plate; a shaft coupled to the center of the electrically driven motor to interlock with the electrically driven motor; a skirt member coupled along the edge of a lower end of the housing to protect various members positioned therein from external shock and connected to a vacuum sucker to collect polishing dust; and a dust collection pipe connecting a hose of the dust collector to the skirt member.

Description

Electric grinder{ELECTRIC ORBITAL SANDER}

The present invention relates to an electric grinder, and more particularly, to an electric grinder that cools heat generated by an electric drive motor during operation by dust collection of a dust collector.

Industrial equipment requires regular and continuous maintenance for its durability.

In particular, it is necessary to polish and manage parts that are protruding or inferior to pipes, automobile exteriors, or painted parts, etc., in which pressure is applied among automobile manufacturing plants and basic facilities of the building industry that emphasize the exterior.

Therefore, in such industrial sites, a polishing process for polishing a certain portion of equipment or articles is applied as necessary.

In this polishing process, a step of finely finishing the surface roughness of the specimen is carried out step by step using a sandpaper having a larger particle size and a smaller particle size. In this polishing process, an operator performs the polishing process with, for example, an electric polishing machine.

In general, the electric drive motor of the electric grinder generates a lot of heat during operation, and this heat damages the electric drive motor or is installed in the upper and lower cover plates supporting the upper and lower parts of the electric drive motor. There is a problem that the lubrication action in the bearing is disturbed by burning or melting the grease (lubricating oil) in the (motor cover plate bearing).

That is, there is a problem that the heat of the electric drive motor increases the temperature of the motor cover plate bearing and burns or melts grease (lubricating oil) in the bearing.

However, conventional electric grinders do not provide an efficient means for cooling the heat of the motor cover plate bearing installed on the cover plate generated by the heat of the electric drive motor.

Republic of Korea Patent Publication No. 10-2012-0132405 (published on May 12, 2012)

An object of the present invention for solving the conventional problems as described above is to absorb heat generated from the electric drive motor during the polishing process through one or more holes penetrating the upper and lower portions of the lower cover plate by dust collection of the dust collector, It is to provide an electric grinder that cools the motor cover plate bearing heat by preventing it from rising.

In addition, another object of the present invention is that one or more blades or fans are mounted on the shaft, and when the shaft rotates at high speed, the electric drive motor and the motor cover plate bearing generate air flow to the electric drive motor by one or more blades or fans. It is an electric type that more effectively cools the heat of the electric drive motor and the motor cover plate bearing by preventing the heat from rising and cooling the heat generated by the electric drive motor or by allowing the dust collector to more efficiently absorb the heat generated from the electric drive motor through the hole and the suction pipe. It is to provide a grinder.

In order to achieve the above object, the electric polishing machine according to the present invention comprises: an electric drive motor that is placed inside a housing and rotated by electricity; Upper and lower cover plates configured to configure upper and lower portions of the electric drive motor to fix the electric drive motor and protect the inside of the electric drive motor; A motor cover plate bearing placed in the upper and lower cover plates; A shaft coupled to the center of the electric drive motor to interlock with the electric drive motor; A cut member coupled to the vacuum suction unit to protect the various members located along the lower edge of the housing from external impacts and collect abrasive dust; And a dust collecting pipe connecting the hose of the dust collector to the cut member.

In addition, in the electric polishing machine according to the present invention, the lower cover plate further includes one or more holes penetrating the upper and lower portions, or the dust collecting pipe further includes a suction pipe connected to the inner space of the motor.

In addition, the electric polishing machine according to the present invention, when collecting abrasive dust in the skirt member through the vacuum suction device, absorbs heat generated from the electric drive motor through at least one hole formed in the lower cover plate or the suction pipe. It characterized in that cooling the electric drive motor.

In addition, the electric grinder according to the present invention is characterized in that the electric drive motor is cooled to cool the motor cover plate bearings installed in the upper and lower cover plates.

In addition, the electric grinder according to the present invention is characterized in that it further comprises at least one blade or fan at the end or side of the shaft.

Details of other embodiments are included in "Specific Contents for Carrying out the Invention" and the attached "Drawings".

Advantages and/or features of the present invention, and methods of achieving them will become apparent with reference to various embodiments described below in detail with reference to the accompanying drawings.

However, the present invention is not limited only to the configuration of each embodiment disclosed below, but may be implemented in various different forms, and only each embodiment disclosed in the present specification makes the disclosure of the present invention complete, and the present invention It should be understood that the present invention is provided to completely inform the scope of the present invention to those skilled in the art to which it belongs, and that the present invention is only defined by the scope of each claim in the claims.

According to the present invention, heat generated from the electric drive motor during the polishing process is absorbed by the dust collector through at least one hole penetrating the upper and lower portions of the lower cover plate, thereby preventing the heat of the electric drive motor and the motor cover plate bearing from rising. It has the effect of cooling by blocking.

In addition, according to the present invention, one or more blades or fans are mounted on the shaft, and when the shaft rotates at high speed, air flow is generated to the electric drive motor by the one or more blades or fans, so that the electric drive motor and the motor cover plate bearing The effect of cooling the heat generated by the electric drive motor by preventing the heat from rising or by allowing the dust collector to more efficiently absorb the heat generated from the electric drive motor through the hole and the suction pipe, thereby more effectively cooling the heat of the electric drive motor and the motor cover plate bearing. have.

1 is a cross-sectional view showing the overall configuration of an electric polishing machine according to the present invention.
2 is a cross-sectional view showing a configuration in which a hole is formed in a lower cover plate in the electric polishing machine according to the present invention.
3 is a view showing a configuration in which a suction pipe is formed in the electric polishing machine according to the present invention.
Figure 4 is a view showing a configuration including one or more blades or fans on the side of the shaft in the electric grinder according to the present invention.
5 is a view showing a configuration including one or more blades or fans at the end of the shaft in the electric grinder according to the present invention.

Before describing the present invention in detail, terms or words used in the present specification should not be interpreted as being unconditionally limited to a conventional or dictionary meaning, and in order for the inventor of the present invention to describe his or her invention in the best way It should be understood that the concepts of various terms can be appropriately defined and used, and furthermore, these terms or words should be interpreted as meanings and concepts consistent with the technical idea of the present invention.

That is, the terms used in the present specification are only used to describe the preferred embodiments of the present invention, and are not intended to specifically limit the content of the present invention, and these terms refer to various possibilities of the present invention. It should be noted that this is a term defined in consideration.

In addition, in this specification, it should be understood that the singular expression may include a plural expression unless clearly indicated in a different meaning in the context, and may include the singular meaning even if similarly expressed as a plural number. .

Throughout the present specification, when a component is described as "including" another component, it does not exclude any other component, but further includes any other component unless otherwise indicated. It can mean that you can do it.

Furthermore, in the case where a component is described as "existing inside or connected and installed" of another component, the component may be directly connected to or installed in contact with the other component, and It may be installed spaced apart by a distance, and in the case of installation spaced apart by a certain distance, a third component or means may exist for fixing or connecting the component to other components. It should be noted that a description of the elements or means of 3 may be omitted.

On the other hand, when a component is described as being "directly connected" or "directly connected" to another component, it should be understood that there is no third component or means.

Likewise, other expressions describing the relationship between each component, such as "between" and "directly between", or "neighbor to" and "directly neighbor to" have the same effect. Should be interpreted as.

In addition, in the present specification, terms such as "one side", "the other side", "one side", "the other side", "first", "second", etc., if used, this one constituent element for one constituent element It is used in order to be clearly distinguishable from other components, and it should be noted that the meaning of the component is not limitedly used by such terms.

In addition, terms related to positions such as "upper", "lower", "left", and "right" in the present specification, if used, should be understood as indicating a relative position in the drawing with respect to the corresponding component, These position-related terms should not be understood as referring to absolute positions unless absolute positions are specified for their positions.

In addition, in the present specification, in specifying the reference numerals for each component of each drawing, the same reference numerals for the same components even if the components are indicated in different drawings, that is, the same reference throughout the specification. The symbols indicate the same components.

In the drawings attached to the present specification, the size, position, coupling relationship, etc. of each component constituting the present invention are partially exaggerated, reduced, or omitted in order to sufficiently clearly convey the spirit of the present invention or for convenience of description. It may have been described, and therefore its proportion or scale may not be exact.

Further, in the following description of the present invention, a detailed description of a configuration that is determined to unnecessarily obscure the subject matter of the present invention, for example, a known technology including the prior art, may be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the related drawings.

1 is a cross-sectional view showing the overall configuration of an electric polishing machine according to the present invention.

Referring to FIG. 1, the electric polishing machine 1000 according to the present invention comprises an electric drive motor 200 installed in the housing 100 and rotated by electricity, and the upper and lower portions of the electric drive motor 200. An upper and lower cover plate 300 for fixing the electric drive motor 200 and protecting the inside of the electric drive motor 200, a motor cover plate bearing 30 placed in the upper and lower cover plates 300, and , The shaft 400 is coupled to the center of the electric drive motor 200 and interlocks with the electric drive motor 200, and is coupled along the lower edge of the housing 100 to protect various members located inside from external impacts. In addition, it includes a cut member 500 connected to the vacuum suction device to collect abrasive dust, and a dust collection pipe 1 connecting the hose of the dust collector 6 to the cut member 500.

In addition, the electric grinder 1000 according to the present invention is a shaft balancer 600 having a bearing receiving portion 10 formed thereon, and a rotational motion by receiving the rotational force of the shaft 400 through the shaft balancer 600. It further includes a spindle member 700, a spindle bearing 20 accommodating the spindle member 700 therein and positioned in the bearing accommodating portion 10, and a PCB 5 for controlling AC power and DC power.

On the other hand, the electric polishing machine 1000 according to the present invention is coupled to the lower end of the spindle member 700 and interlocked with the spindle member 700 to perform a rotational motion, a backup pad 800, and a lower portion of the backup pad 800. It further includes a sand paper member 900 attached to perform a polishing operation.

Here, the cut member 500 is in close contact with the backup pad 800 in order to increase the efficiency of dust collection.

In general, unlike a pneumatic grinder, the electric drive motor 200 of a general electric grinder generates a lot of heat during operation.

This heat damages the electric drive motor 200 or burns or melts grease (lubricating oil) in the motor cover plate bearing 30 installed on the cover plate 300 constituting the upper and lower parts of the electric drive motor 200. The lubrication action in the motor cover plate bearing 30 is obstructed, which causes a major failure of the electric grinder, and for this reason, there is a problem that the electric grinder cannot be continuously used for a long time with high speed rotation.

To solve this problem, other electric grinders attach a cooling fan to the shaft balancer 600 outside the electric drive motor to cool the shaft 400 and cool the electric drive motor 200 connected thereto. Although a method has been proposed, there is a problem in that the cooling efficiency is very low in cooling to the temperature inside the electric drive motor 200.

Accordingly, a configuration for solving this problem will be described with reference to FIGS. 2 and 3.

2 is a cross-sectional view showing a configuration in which a hole is formed in a lower cover plate in the electric polishing machine according to the present invention.

Referring to FIG. 2, in the electric polishing machine 1000 according to the present invention, the lower cover plate 300 further includes one or more holes 2 penetrating the upper and lower portions.

The upper and lower cover plates 300 serve to support the electric drive motor 200 and form the upper and lower portions of the electric drive motor 200, and one or more holes penetrating the upper and lower portions of the lower cover plate 300 ( 2) is further included.

When the dust collector 6 connected from the outside of the electric grinder 1000 collects the abrasive dust in the skirt member 500 through the dust collection pipe 1, through one or more holes 2 formed in the lower cover plate 300 The electric drive motor 200 is cooled and the heat generated from the motor cover plate bearing 30 is sucked together, thereby cooling the electric drive motor 200.

In addition, the electric drive motor 200 is cooled so that the motor cover plate bearings 30 installed in the upper and lower cover plates 300 are also cooled.

This is because the motor cover plate bearing 30 and the electric drive motor 200 are located in the housing 100 and the skirt member 500, so when the dust collector 6 collects the abrasive dust in the skirt member 500, it is polished. Heat generated from the electric drive motor 200 and the motor cover plate bearings 30 installed in the upper and lower portions of the electric drive motor 200 along with dust are also sucked in through one or more holes 2.

3 is a view showing a configuration in which a suction pipe is formed in the electric polishing machine according to the present invention.

Referring to FIG. 3, in the electric grinder 1000 according to the present invention, the dust collecting pipe 1 further includes a suction pipe 3 connected to the inner space 210 of the electric drive motor 200.

Here, when the dust collector 6 connected from the outside of the electric grinder 1000 collects the abrasive dust in the skirt member 400 through the dust collection pipe 1, it is generated by the electric drive motor 200 through the suction pipe 3 The electric drive motor 200 is cooled by absorbing heat.

In addition, the electric drive motor 200 is cooled so that the motor cover plate bearings 30 installed in the upper and lower cover plates 300 are also cooled.

Similarly, since the motor cover plate bearing 30 and the electric drive motor 200 are located in the housing 100 and the skirt member 500, the dust collector 6 collects abrasive dust in the skirt member 400. , Heat generated from the electric drive motor 200 and the motor cover plate bearing 30 installed in the electric drive motor 200 is sucked through the suction pipe 3.

On the other hand, the electric grinder 1000 according to the present invention has a hole near the housing 100 itself or a handle coupled to the housing 100 in order to further increase the cooling efficiency by smoothing the air flow inside the electric drive motor 200. It may be formed to allow external air to enter into the electric grinder 1000.

In addition, the hole may also be formed in the vicinity of the electrical pipe (4).

As such, it is possible to cool the electric drive motor 200 and the motor cover plate bearing 30 by one or more holes 2 or suction pipes 3 as shown in FIGS. Since the drive motor 200 itself and the motor cover plate bearing 30 can be prevented from being damaged, and cooling efficiency can be improved, high-speed rotation is possible.

Experimental results of the electric polishing machine 1000 according to the present invention,

In the electric polishing machine 1000 according to the present invention, the temperature of the shaft balancer 600 was measured to be about 30 degrees, and the temperature of the electric drive motor 200 was measured to be about 30 degrees before polishing.

Then, when the polishing machine is operated, the temperature of the shaft balancer 600 is about 62 degrees and the temperature of the electric drive motor 200 is about 72 degrees when the conventional electric polishing machine is operated for 10 minutes.

However, in the electric grinder 1000 according to the present invention having one or more holes 2, the temperature of the shaft balancer 600 is about 46 degrees when operated for 10 minutes together with the dust collector 6, and the electric drive motor 200 The temperature of is about 58 degrees.

In addition, when the electric grinder 1000 according to the present invention having the suction pipe 3 is operated with the dust collector 6 for 10 minutes, the shaft balancer 600 is about 46 degrees, and the temperature of the electric drive motor 200 is about 55 degrees.

In addition, the electric grinder 1000 according to the present invention having one or more holes 2 or suction pipes 3 includes a shaft balancer 600 and an electric drive motor 200 when operating for 10 minutes or more together with the dust collector 6. It was confirmed that the temperature of was no longer increased.

In addition, the electric grinder 1000 without one or more holes 2 or the suction pipe 3 is in a state in which the temperature of the electric drive motor 200 rises to 70 degrees or more during operation, one or more holes ( 2) Alternatively, when the suction pipe 3 was formed and operated for an additional 10 minutes together with the dust collector 6, it was confirmed that the temperature of the electric drive motor 200 dropped to 58 degrees or less.

Figure 4 is a view showing a configuration including one or more blades or fans on the side of the shaft in the electric polishing machine according to the present invention, Figure 5 is a view including one or more blades or fans at the end of the shaft in the electric polishing machine according to the present invention. It is a diagram showing the configuration.

Referring to FIG. 4, in the electric polishing machine 1000 according to the present invention, at least one blade or fan 410 is further included on the side of the shaft 400.

Further, referring to FIG. 5, in the electric grinder 1000 according to the present invention, at least one blade or fan 410 is further included at an end of the shaft 400.

That is, in the electric grinder 1000 according to the present invention, the end or side of the shaft 400 further includes one or more blades or fans 410.

Preferably, the end of the shaft 400 may include a convex portion 420 having one or more blades or fans 410.

In FIGS. 4 and 5, two blades or fans 410 are shown for ease of description, but are not limited thereto, and one or three or more, that is, one or more blades or fans 410 as necessary. It is okay to be equipped.

In addition, the size of the blade or fan 410 described above is not limited, and any size of the blade or fan 410 may be used as long as it generates a flow of air in the electric drive motor 200.

When the electric grinder 1000 is driven, the shaft 400 and the electric drive motor 200 rotate at high speed, and heat is generated from the electric drive motor 200, which is generated by the heat of the electric drive motor 200. If there is no effective means for cooling the heat of the motor cover plate bearing 30, the heat of the electric drive motor 200 increases the temperature of the motor cover plate bearing 30 to burn or melt grease (lubricating oil) in the bearing. Problems arise.

However, if one or more blades or fans 410 are mounted on the shaft 400, the flow of air to the electric drive motor 200 is prevented by the one or more blades or fans 410 when the shaft 400 rotates at high speed. Will occur.

That is, one or more blades or fans 410 mounted on the shaft 400 generate an electric fan effect.

The air flow generated in this way cools the electric drive motor 200.

In addition, the electric drive motor 200 is cooled so that the motor cover plate bearings 30 installed in the upper and lower cover plates 300 are also cooled.

In addition, one or more blades or fans 410 are mounted on the shaft 400, so that the heat generated by the electric drive motor 200 by the one or more blades or fans 410 when the shaft 400 rotates at high speed is a dust collector. The heat of the electric drive motor 200 and the motor cover plate bearing 30 is cooled more effectively by making the (6) suck more efficiently through the hole 2 and the suction pipe 3.

In addition, heat generated in the motor 200 and the motor cover plate bearing 30 during the polishing process described in FIGS. 2 and 3 is collected by the dust collector 6 through one or more holes 2 or suction pipes 3. In the process of cooling the electric drive motor 200 and the motor cover plate bearing 30 by sucking, if the dust collector 6 fails, only the polishing machine 1000 is operated, so that the electric drive motor 200 and the motor cover plate bearing ( There may be a blind spot where the cooling of 30) stops.

At this time, if one or more blades or fans 410 are mounted on the shaft 400, the flow of air to the electric drive motor 200 is controlled by the one or more blades or fans 410 when the shaft 400 rotates at high speed. It is generated, and while the dust collector 6 is stopped, a blind spot in which cooling by the dust collector 6 is stopped can be eliminated to some extent.

In addition, when the shaft 400 rotates at high speed, when there is a blockage of one or more holes 2 or the suction pipe 3 by generating a flow of air to the electric drive motor 200 by one or more blades or fans 410 , You can pierce it.

Likewise, when the shaft 400 rotates at high speed, air flow is generated to the electric drive motor 200 by one or more blades or fans 410 to cool the heat by itself and connect from the outside of the electric grinder 1000 When the dust collector 6 collects the abrasive dust in the skirt member 500 through the dust collection pipe 1, electricity is more easily made through one or more holes 2 or suction pipes 3 formed in the lower cover plate 300. By cooling the drive motor 200 and sucking heat generated from the motor cover plate bearing 30 together, the electric drive motor 200 is cooled more efficiently and easily.

As described above, according to the present invention, the heat generated in the motor 200 and the motor cover plate bearing 30 during the polishing process is generated by the electric drive motor by one or more blades or fans 410 when the shaft 400 rotates at high speed. Heat generation is suppressed by the air generated in the 200, and is sucked by the dust collector 6 through one or more holes 2 or suction pipes 3, so that the electric drive motor 200 and the motor cover plate bearing ( It has the effect of cooling 30).

In addition, one or more blades or fans 410 are mounted on the shaft 400, so that when the shaft 400 rotates at high speed, the flow of air to the electric drive motor 200 is generated by the one or more blades or fans 410. To prevent heat from rising from the electric drive motor 200 and the motor cover plate bearing 30 to cool or electric drive When the dust collector 6 collects the heat generated by the motor 200 more strongly, the heat of the electric drive motor 200 and the motor cover plate bearing 30 is more effectively cooled.

In the above, various preferred embodiments of the present invention have been described with some examples, but the description of various various embodiments described in the "Specific Contents for Carrying out the Invention" section is merely exemplary, and the present invention is Those of ordinary skill in the art will appreciate that various modifications of the present invention or implementation equivalent to the present invention can be performed from the above description.

In addition, since the present invention can be implemented in a variety of other forms, the present invention is not limited by the above description, and the above description is intended to complete the disclosure of the present invention, and is generally used in the technical field to which the present invention pertains. It should be understood that it is provided only to fully inform the scope of the present invention to those skilled in the art, and that the present invention is only defined by each claim of the claims.

1: dust collecting pipe
2: hole
3: suction pipe
4: electrical piping
5: PCB
6: dust collector
7: wire
10: bearing receiving part
20: spindle bearing
30: motor cover plate bearing
100: housing
200; Electric drive motor
300: cover plate
400: shaft
410: blade or fan
420: convex
500: cut member
600: shaft balancer
700: spindle member
800: backup pad
900: sand paper member
1000: electric grinder

Claims (5)

An electric drive motor placed inside the housing and rotated by electricity;
Upper and lower cover plates configured to configure upper and lower portions of the electric drive motor to fix the electric drive motor and protect the inside of the electric drive motor;
A motor cover plate bearing placed in the upper and lower cover plates;
A shaft coupled to the center of the electric drive motor to interlock with the electric drive motor;
A cut member coupled to the vacuum suction unit to protect the various members located along the lower edge of the housing from external impacts and collect abrasive dust; And
Characterized in that it includes; a dust collecting pipe connecting the hose of the dust collector to the cut member,
Electric grinder.
The method of claim 1,
The lower cover plate further comprises one or more holes penetrating the upper and lower portions, or the dust collecting pipe further comprises a suction pipe connected to the inner space of the motor,
Electric grinder.
The method of claim 2,
When collecting the abrasive dust in the skirt member through the vacuum suction device, the electric drive motor is cooled by sucking heat generated from the electric drive motor through at least one hole formed in the lower cover plate or the suction pipe. doing,
Electric grinder.
The method of claim 3,
The electric drive motor is cooled to cool the electric drive motor bearings installed in the upper and lower cover plates,
Electric grinder.
The method according to claim 1 or 4,
It characterized in that it further comprises one or more blades or fans 410 at the end or side of the shaft,
Electric grinder.

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