KR102372991B1 - Electric orbital sander - Google Patents

Abstract

It is an object of the present invention to absorb heat generated from the electric drive motor during the polishing process through one or more holes penetrating the upper and lower parts of the lower cover plate by the dust collector, thereby increasing the heat of the electric drive motor and the motor cover plate bearing. It is to provide an electric grinder that blocks and cools.
In order to achieve the above object, the electric polishing machine according to the present invention, an electric drive motor that is placed in the interior of the housing is rotated by electricity; upper and lower cover plates constituting upper and lower portions of the electric drive motor to fix the electric drive motor and to protect the inside of the electric drive motor; a motor cover plate bearing mounted in the upper and lower cover plates; a shaft coupled to the center of the electric drive motor and interlocking with the electric drive motor; a cut member coupled along the lower edge of the housing to protect various members located therein from external impact and connected to a vacuum suction unit to collect abrasive dust; and a dust collecting pipe connecting the hose of the dust collector to the cut 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 collecting of the dust collector.

Industrial equipment requires regular and continuous maintenance for its durability.

In particular, it is necessary to polish and manage protruding or unpretentious parts of pipes, automobile exteriors, or painted parts where pressure is applied among automobile manufacturing plants and building industry infrastructure that value appearance.

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

And in this polishing process, a process of finely refining the surface roughness of the specimen step by step using sandpaper of smaller particles from large-grained sandpaper is performed.

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 the bearings installed in the upper and lower cover plates supporting the upper and lower parts of the electric drive motor. A problem occurs in that the lubrication in the bearing is disturbed by burning or melting the grease (lubricating oil) in the (motor cover plate bearing).

That is, the heat of the electric drive motor raises the temperature of the motor cover plate bearing, causing a problem of burning or melting the grease (lubricating oil) in the bearing.

However, the conventional electric grinder does 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 12.05. 2012)

An object of the present invention to solve the conventional problems as described above is by sucking the heat generated from the electric drive motor during the grinding process by the dust collector of the electric drive motor through one or more holes penetrating the upper and lower parts of the lower cover plate. and to provide an electric grinder that cools the motor cover plate bearing by preventing the heat from rising.

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

In order to achieve the above object, the electric polishing machine according to the present invention, an electric drive motor that is placed in the interior of the housing is rotated by electricity; upper and lower cover plates constituting 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 mounted in the upper and lower cover plates; a shaft coupled to the center of the electric drive motor and interlocking with the electric drive motor; a cut member coupled along the lower edge of the housing to protect various members located therein from external impact and connected to the vacuum suction unit to collect abrasive dust; and a dust collecting pipe connecting the hose of the dust collector to the cut member.

In addition, in the electric grinder according to the present invention, the lower cover plate further comprises one or more holes penetrating the upper and lower parts, or the dust collecting pipe is characterized in that it further comprises a suction pipe connected to the inner space of the motor.

In addition, the electric grinder according to the present invention sucks heat generated from the electric drive motor through one or more holes formed in the lower cover plate or the suction pipe when dust is collected in the skirt member through the vacuum suction device. and 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 one or more blades or fans at the end or side of the shaft.

Specific details of other embodiments are included in "Details for carrying out the invention" and attached "drawings".

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

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

According to the present invention, the heat generated by the electric drive motor during the grinding process is sucked by the dust collector during the grinding process through one or more holes penetrating the upper and lower parts of the lower cover plate, thereby increasing the heat of the electric drive motor and the motor cover plate bearing. It has a cooling effect.

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, the air flow is generated in the electric drive motor by the one or more blades or fans to form the electric drive motor and the motor cover plate bearing. The effect of cooling the electric drive motor and the motor cover plate bearing is more effective by preventing the heat from rising to cool it, or by allowing the dust collector to more efficiently absorb the heat generated by the electric drive motor through the hole and suction pipe. there is.

1 is a cross-sectional view showing the overall configuration of an electric polishing machine according to the present invention.
Figure 2 is a cross-sectional view showing a configuration in which a hole is formed in the lower cover plate in the electric grinder according to the present invention.
Figure 3 is a view showing a configuration in which the suction pipe is formed in the electric grinder according to the present invention.
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, the terms or words used herein should not be construed as being unconditionally limited to their ordinary or dictionary meanings, and in order for the inventor of the present invention to explain his 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 herein are only used to describe preferred embodiments of the present invention, and are not used for the purpose of specifically limiting the content of the present invention, and these terms represent various possibilities of the present invention. It should be understood that the term has been defined taking into account.

Also, in this specification, it should be understood that, unless the context clearly indicates otherwise, the expression in the singular may include a plurality of expressions, and even if it is similarly expressed in plural, it should be understood that the meaning of the singular may be included. .

When it is stated throughout this specification that a component "includes" another component, it does not exclude any other component, but further includes any other component unless otherwise stated. It could mean that you can.

Furthermore, when it is described that a component is "exists in or is connected to" of another component, this component may be directly connected to or installed in contact with another component, and a certain It may be installed spaced apart at a distance, and in the case of being installed spaced apart by a certain distance, a third component or means for fixing or connecting the corresponding component to another component may exist, and now It should be noted that the description of the components or means of 3 may be omitted.

On the other hand, when it is described that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the third element or means does not exist.

Likewise, other expressions describing the relationship between components, such as "between" and "immediately between", or "adjacent to" and "directly adjacent to", have the same meaning. should be interpreted as

In addition, if terms such as "one side", "other side", "one side", "other side", "first", "second" are used in this specification, with respect to one component, this one component is It is used to be clearly distinguished from other components, and it should be understood that the meaning of the component is not limitedly used by such terms.

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

In addition, in this specification, in specifying the reference numerals for each component in each drawing, the same component has the same reference number even if the component is indicated in different drawings, that is, the same reference throughout the specification. Symbols indicate identical components.

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

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

Hereinafter, an embodiment 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 that is placed inside a housing 100 and rotates by electricity, and upper and lower parts 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 , and a motor cover plate bearing 30 mounted in the upper and lower cover plates 300 , and , a shaft 400 coupled to the center of the electric drive motor 200 and interlocking with the electric drive motor 200, coupled along the lower end edge of the housing 100 to protect various members located therein from external impact, and In addition, it includes a scutt member 500 connected to the vacuum suction device to collect the abrasive dust, and a dust collecting pipe 1 connecting the hose of the dust collector 6 to the scutt member 500 .

In addition, the electric grinder 1000 according to the present invention receives the shaft balancer 600 having the bearing receiving part 10 formed thereon and the rotational force of the shaft 400 through the shaft balancer 600 to perform a rotational motion. It further includes a spindle member 700 , a spindle bearing 20 accommodating the spindle member 700 therein and positioned in the bearing accommodating part 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 interlocking with the spindle member 700 to perform a rotational movement, the backup pad 800 and the backup pad 800 in the lower portion. 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 by itself during operation.

This heat damages the electric drive motor 200 or burns or melts the 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 disturbed, which causes the main 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 due to high speed rotation.

In order to solve this problem, another electric grinder cools the shaft 400 by attaching a cooling fan to the shaft balancer 600 on the outside of the electric drive motor, and cools the electric drive motor 200 connected thereto. Although the method has been proposed, there is a problem in that cooling efficiency is very low to cool the electric drive motor 200 to the internal temperature.

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 the lower cover plate in the electric polishing machine according to the present invention.

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

The upper and lower cover plates 300 serve to support the electric drive motor 200 and form 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 abrasive dust in the skirt member 500 through the dust collection pipe 1, one or more holes 2 formed in the lower cover plate 300 Through By cooling the electric drive motor 200 and sucking heat generated from the motor cover plate bearing 30 together, the electric drive motor 200 is cooled.

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

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 , the abrasive Heat generated from the electric drive motor 200 and the motor cover plate bearing 30 installed at the upper and lower portions of the electric drive motor 200 along with the dust is 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 internal 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 in the electric drive motor 200 through the suction pipe 3 The heat is absorbed to cool the electric drive motor 200 .

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

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 , in the process of the dust collector 6 collecting the abrasive dust in the skirt member 400 , , the electric drive motor 200 and the heat generated from 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 in the vicinity of the handle coupled to the housing 100 itself or the housing 100 in order to further increase the cooling efficiency by smoothing the air flow inside the electric drive motor 200 . may be formed to allow external air to enter into the electric polishing machine 1000 .

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

In this way, as shown in FIGS. 2 and 3, the electric drive motor 200 and the motor cover plate bearing 30 can be cooled by one or more holes 2 or the suction pipe 3, so that electricity caused by high temperature Since damage to the drive motor 200 itself and the motor cover plate bearing 30 can be prevented, and cooling efficiency can be increased, there is an advantage that high-speed rotation is possible.

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

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

Then, when the grinder 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 grinder operates 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 with the dust collector 6 for 10 minutes, and the electric drive motor 200 The temperature is about 58 degrees.

In addition, when the electric grinder 1000 according to the present invention having the suction pipe 3 is operated for 10 minutes with the dust collector 6, 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 pipe 3 includes a shaft balancer 600 and an electric drive motor 200 when operating with the dust collector 6 for 10 minutes or more. It was confirmed that the temperature did not rise any more.

In addition, the electric grinder 1000 without one or more holes 2 or suction pipe 3 has one or more holes ( 2) Alternatively, it was confirmed that the temperature of the electric drive motor 200 dropped to 58 degrees or less when the suction pipe 3 was formed and the dust collector 6 was operated for an additional 10 minutes.

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, and FIG. 5 is the electric grinder according to the present invention. It is a drawing showing the configuration.

Referring to FIG. 4 , in the electric grinder 1000 according to the present invention, the side of the shaft 400 further includes one or more blades or a fan 410 .

In addition, referring to FIG. 5 , in the electric grinder 1000 according to the present invention, the end of the shaft 400 further includes one or more blades or a fan 410 .

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 explanation, but the present invention is not limited thereto. It is free even if it is installed.

In addition, the size of the above-described blade or fan 410 is not limited, and any size of blade or fan 410 may be used as long as it generates an air flow 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 , and the heat generated by the electric drive motor 200 . If there is no effective means to cool the heat of the motor cover plate bearing 30, the heat of the electric drive motor 200 raises the temperature of the motor cover plate bearing 30 to burn or melt the grease (lubricating oil) in the bearing. problems will arise.

However, if one or more blades or fans 410 are mounted on the shaft 400, when the shaft 400 rotates at a high speed, the air flows to the electric drive motor 200 by the one or more blades or fans 410 will cause

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

The generated air flow cools the electric driving motor 200 .

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

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

In addition, the 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 pipe 3 . In the process of sucking in and cooling the electric drive motor 200 and the motor cover plate bearing 30, if the dust collector 6 fails, only the grinder 1000 is operated to operate the electric drive motor 200 and the motor cover plate bearing ( 30), there may be a blind spot where the cooling stops.

At this time, if one or more blades or fans 410 are mounted on the shaft 400, when the shaft 400 rotates at a high speed, the air flows to the electric drive motor 200 by the one or more blades or fans 410 And while the dust collector 6 is stopped, the blind spot where the cooling by the dust collector 6 is stopped can be resolved to some extent.

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

Similarly, when the shaft 400 rotates at a high speed, one or more blades or a fan 410 generates a flow of air in the electric drive motor 200 to cool itself and connect from the outside of the electric grinder 1000 When the dust collector 6 to be used collects the abrasive dust in the skirt member 500 through the dust collection pipe 1, it is electrically charged more easily through the one or more holes 2 or the suction pipe 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, when the shaft 400 rotates at high speed, heat generated in the motor 200 and the motor cover plate bearing 30 during the grinding process is driven by one or more blades or the fan 410 to the electric drive motor. By suppressing heat generation by the air generated in the 200, and sucking it by the dust collection of the dust collector 6 through one or more holes 2 or suction pipe 3, the electric drive motor 200 and the motor cover plate bearing ( 30) has a cooling effect.

In addition, one or more blades or fans 410 are mounted on the shaft 400, and when the shaft 400 rotates at high speed, the air flow is generated in the electric drive motor 200 by one or more blades or fans 410 to prevent the heat of the electric drive motor 200 and the motor cover plate bearing 30 from rising to cool it or to drive the electric drive By making the dust collector 6 more strongly collect the heat generated by the motor 200 during dust collection, there is an effect of more effectively cooling the heat of the electric drive motor 200 and the motor cover plate bearing 30 .

In the above, although several preferred embodiments of the present invention have been described with some examples, the descriptions of various various embodiments described in the "Specific Contents for Carrying Out the Invention" item are merely exemplary, and the present invention Those of ordinary skill in the art will understand well that the present invention can be practiced with various modifications or equivalents to the present invention from the above description.

In addition, since the present invention can be implemented in various 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 usually It should be understood that this is only provided to fully inform those with knowledge of the scope of the present invention, and that the present invention is only defined by each of the claims.

1: Dust collection pipe
2: hole
3: suction pipe
4: electrical plumbing
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 part
500: no scutt
600: shaft balancer
700: spindle member
800: backup pad
900: sand paper absence
1000: electric grinder

Claims (5)

an electric drive motor mounted in the housing and rotated by electricity;
upper and lower cover plates constituting upper and lower portions of the electric drive motor to fix the electric drive motor and to protect the inside of the electric drive motor;
a motor cover plate bearing mounted in the upper and lower cover plates;
a shaft coupled to the center of the electric drive motor and interlocking with the electric drive motor;
a cut member coupled along the lower edge of the housing to protect various members located therein from external impact and connected to a vacuum suction unit to collect abrasive dust; and
Including; a dust collecting pipe connecting the hose of the dust collector to the cut member;
The lower cover plate further includes one or more holes penetrating the upper and lower parts, and the dust collection pipe further includes a suction pipe connected to the inner space of the motor,
When the abrasive dust in the cut member is collected through the vacuum sucker, heat generated from the electric drive motor is sucked through one or more holes formed in the lower cover plate and the suction pipe to cool the electric drive motor,
The end or side of the shaft further comprises one or more blades or fans,
When the shaft rotates at high speed, one or more blades or fans generate a flow of air in the electric drive motor to cool the electric drive motor, and the one or more blades or fans reduce heat generated in the electric drive motor. allowing the dust collector to suck through one or more holes and the suction pipe;
If there is a blockage in one or more holes or suction pipe, characterized in that when the shaft rotates at high speed, the blockage is eliminated by generating an air flow in the electric drive motor by one or more blades or fans,
electric grinder.
delete delete The method of claim 1,
wherein the electric drive motor is cooled to cool the electric drive motor bearings mounted in the upper and lower cover plates,
electric grinder.
delete

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