WO2016027936A1

WO2016027936A1 - Apparatus for attaching/detaching grinding tool for grinder

Info

Publication number: WO2016027936A1
Application number: PCT/KR2014/011456
Authority: WO
Inventors: 김창성; 김경진
Original assignee: 김창성; 김경진
Priority date: 2014-08-21
Filing date: 2014-11-27
Publication date: 2016-02-25
Also published as: CN106061680B; EP3067155B1; ES2786188T3; CN106061680A; PT3067155T; EP3067155A4; EP3067155A1; KR101535217B1

Abstract

The present invention relates to an apparatus for attaching/detaching a grinding tool for a grinder that can: allow the grinding tool to be conveniently attached to and detached from a coupler that is coupled to a rotating shaft of a main body constituting a hand grinder to rotate at a high speed; reinforce the adhesion force between the coupler and the grinding tool to prevent shaking thereof while grinding and to ensure stability and continuity of work; and effectively transmit power. The apparatus, according to the present invention, comprises a grinding tool, a coupler, a sleeve, locking balls, a spring, and a cap nut. The grinding tool has a cylindrical shaft, a recess, and a rectangular shaft that are formed in succession on the tip end portion of one side of a body thereof. The coupler has a mounting hole into which the grinding tool is fixedly inserted, a rectangular hole, and a screw hole to which a grinder body is fastened, and has two columns of through-holes and a flange that are formed on the peripheral surface thereof. The sleeve has a lower anti-vibration groove and a mounting groove that are formed on one side of the inner diameter part in a stepped manner and an upper anti-vibration groove formed on an opposite side thereof. The locking balls are accommodated in the through-holes formed in the coupler and are configured to move to the cylindrical shaft and the recess of the grinding tool to lock or unlock the grinding tool when the sleeve moves. The spring applies a resilient force to the sleeve when the sleeve slides. The cap nut is configured to regulate the location where the sleeve is assembled.

Description

Grinding and polishing equipment for grinder

The present invention can be easily detached and attached to a coupler (Coupler) that is fastened to the rotating shaft of the main body constituting the hand grinder and at the same time to enhance the adhesion between the coupler and the polishing tool to shake during grinding operation The present invention relates to a device for removing and attaching a grinding tool for grinding and grinding, which can be prevented and ensured stability and continuity of work as well as smoothly power transmission.

In general, after the primary processing of automobile, shipbuilding, and various industrial parts, secondary processing is required before the parts with less processing, rough surface, or painting are required. In the case of using a grinding machine to sharpen the object by rotating the grindstone at high speed, or in the case of parts that do not require much precision, it is common to finish the object using a light weight and easy-to-use hand grinder.

Conventional hand grinders operate the rotating shaft at high speed by electric motor drive or air pressure generated at the time of operation of the compressor and at the same time, using a grinding tool mounted on the rotating shaft, wood and stone By grinding the surface of the grinding object made of a metal material, etc., the polished or less processed parts, edges and corners are ground and finished.

With regard to such a hand grinder, the technique described in Korean Utility Model Registration No. 0356304 allows the head on which the abrasive plate is mounted to be inserted into the rotary shaft of the grinder and fixed or detached by a fastening member such as a fixing nut. This is a hassle that has to repeat the process of tightening or releasing the fixing nut by using a separate tool such as a spanner, and it takes unnecessary time due to the replacement of the abrasive plate, and it is a place that can be replaced in narrow spaces and heights. The difficulty in continuity of work, such as moving, was a factor in reducing work efficiency.

In addition, in consideration of the above, the Republic of Korea Utility Model Registration No. 0373648 or 0376952 is equipped with a sleeve that moves in the axial direction on the circumference of the coupler to remove the grinding tool in a one-touch manner by releasing the locking ball, Disclosed is a structure for attaching.

However, this conventional method is still inconvenient because it is a structure in which the operator pushes the sleeve off and attaches the sleeve while holding the abrasive tool as a consumable with one hand, and the locking ball is formed at the end of the abrasive tool. Because of the structure of coming out from the groove, vibration phenomenon occurs in the grinding tool which rotates at high speed during grinding operation.

Moreover, since the structure maintains close contact force with the coupler based on the three projections formed on the circumference of the grinding tool, the power transmission may not be performed properly when the work is carried out to some extent, as well as by friction or micro vibration. There was a drawback that the cohesion fell and caused great psychological anxiety for the worker.

The present applicant has already proposed the technique as disclosed in the Republic of Korea Patent No. 1056036 in consideration of the problems of the prior art as described above. In this technology, it is possible to easily detach and attach the grinding tool mounted on the rotating shaft of the grinder body, so that it is possible to improve the work efficiency without the need of a separate tool or fastening means, and the grinding tool and the coupler are geared As a result of this, the adhesive force between the coupler and the grinding tool was greatly strengthened, thereby minimizing the shaking during the work to ensure stability.

However, it was confirmed that some serious defects occurred in the course of repeated tests before supplying the product to the field, and in order to compensate for these defects, it was inevitable to improve some functions. That is, to list the deficiencies in this technology,

First, when the first and second bodies of the abrasive tool, which is a consumable, are subjected to a strong impact during the polishing operation, they are separated from each other, and furthermore, the separated second bodies are inserted into the coupler on the grinder body so that the grinder is no longer used. It happens.

Second, the vibration is more severe than conventional grinders. As the second body of the grinding tool is made of resin, elasticity occurs due to the characteristics of the material, causing vibration.

Third, the dust generated during the polishing operation is accumulated in the operating portion of the coupler is hardened due to the case that the operation does not occur. When used in a dusty workplace, dust, such as paint, oil, powder and dust, accumulates and hardens in the bearing groove, causing malfunction.

Fourth, the abrasive product production process is complicated and the production period and cost is high, the competitiveness of the product is reduced.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a separate tool or fastening means by allowing the easy removal and attachment of an abrasive tool mounted on a rotating shaft of a grinder body. The present invention provides a removal and attachment device for a grinding tool for grinder, which does not require, of course, facilitates replacement of consumables and can continuously perform work.

In addition, another object of the present invention is to improve the adhesion between the coupler and the polishing tool by improving the grinding tool and the coupler by the mechanical contact method by the surface contact, and to hold the grinding tool back and forth by the bearing to shake back and forth during operation The present invention provides a device for removing and attaching a grinding tool for preventing grinding and preventing power transmission.

In addition, the present invention through the sealing means in the connection between the grinding tool and the coupler to suppress the intrusion of foreign matter as much as possible, by forming a separate discharge port in the coupler can be discharged to the outside even dust that can be introduced into the grinder body The present invention provides an apparatus for detaching and attaching an abrasive tool for a grinder.

The present invention for achieving this object is a conventional hand grinder configured to fix or release the grinding tool by the slide movement of the coupler mounted on the rotary shaft of the grinder body and the sleeve assembled to the outer peripheral surface of the coupler, An abrasive tool mounted on one side of the body, a coupler mounted on the grinder body, a sleeve that slides on the circumferential surface of the coupler, a locking ball accommodated in the coupler to fix or release the abrasive tool, and a slide movement of the sleeve. Consists of a spring for providing elasticity, and a cap nut for regulating the assembly position of the sleeve, the groove and the square axis including a cylindrical shaft is formed in succession at one end of the body constituting the polishing tool, the coupler is polished Including the seat hole and the square hole where the tool is fitted In addition to having a screw hole that is bound to the liner body, two rows of through-holes and flanges are formed on the circumferential surface, respectively, and the sleeve is assembled to slide left and right on the circumferential surface of the coupler and is stepped on one side of the inner diameter portion thereof. At the same time the lower dustproof groove and the seating groove is formed with the upper dustproof groove is formed on the other side, the locking ball is accommodated in the through-hole formed in the coupler is moved to the cylindrical shaft and groove of the grinding tool when the sleeve is moved to the polishing tool It is configured to be fixed or released, the spring is disposed in the flange portion of the coupler and the seating groove of the sleeve to give elasticity during the slide movement of the sleeve, the cap nut is fastened to the tip of the coupler to regulate the assembly position of the sleeve Characterized in that configured to be.

In addition, the flange portion of the coupler is characterized in that the dust discharge port extending from the square hole to the outside.

In addition, a protruding jaw bisected by a spherical concave groove is formed in the inner diameter portion of the sleeve to restrict the locking ball, and a lower dustproof rubber and a washer are mounted as a lower dustproof groove, and an upper dustproof rubber is mounted in the upper dustproof groove. It is characterized by being comprised so that dust invasion can be suppressed.

According to the removal and attachment device of the grinding tool for the grinder according to the present invention, it is possible to easily mount the grinding tool mounted on the rotary shaft of the grinder body, so that no separate work tools or fastening means are required and the grinder is in use. The grinding tool can be replaced immediately, which greatly improves the work efficiency.

In addition, due to double fixing of the surface contact portion and the bearing formed in the axial direction on the outer circumferential surface of the grinding tool and the inner surface of the coupler, respectively, the binding is greatly enhanced, thereby minimizing the vibration during the work. It can be done, and accordingly the power transmission can be made very smoothly.

In addition, it is possible to prevent foreign foreign matter from entering into the connection part between the grinding tool and the coupler, and as a separate discharge port is formed in the coupler, even dust that can be introduced into the grinder body by centrifugal force generated when the coupler is rotated. It can be easily released to the outside.

1 is an exploded perspective view of each part for explaining the removal and attachment of the grinding tool,

2a and 2b is an external view and a cross-sectional view taken along line A-A of the grinding tool,

3 is an external view showing another configuration example of the grinding tool,

4a and 4b is a cross-sectional view of the coupler and the line B-B to which the abrasive tool is mounted;

5a and 5b is a cross-sectional configuration of the sleeve and cap nut,

6 is a cross-sectional view showing a fastening state of each component assembled to the coupler;

7a and 7b is a cross-sectional view showing the assembly and operation of each component,

8 is an exploded perspective view of each part showing the removal and attachment of the polishing tool according to the present invention,

9 is a perspective view of a coupler assembly in which each component is assembled;

10A, 10B, 10C are cross-sectional views of the coupler, sleeve, and cap nut,

11 is a sectional view of a coupler assembly in which each component is assembled;

12 is a separate configuration diagram between the grinding tool and the coupler assembly;

13a and 13b are partial cross-sectional views showing the operation relationship of each component,

14 is a sectional view showing a state in which the grinding tool is mounted.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

The present invention utilizes a part of the configuration of the Republic of Korea Patent No. 1056036, but because it improves the part that is highlighted as a defect in this technology, first cited the configuration of the device described in the section related to the improvement of the present invention This will be described in detail.

That is, as shown in Figures 1 to 7a, 7b attached, the removal and attachment device of the grinding tool for the grinder is a polishing tool 11 to which various types of abrasive (P1) is bound, depending on the object to be processed, A coupler 12 which is inserted into and fixed to the abrasive tool 11 and rotates at high speed by the rotary shaft P3 of the grinder main body P2, and a sleeve which slides elastically on the circumferential surface of the coupler 12. (13) is provided.

In addition, the locking ball 14, which is operable to detach and attach the grinding tool 11, by retracting to the inner diameter side of the coupler 12 when the sleeve 13 moves, is elastic to the sleeve 13. Cap 15 is fastened to the front of the coupler 12 and the spring 15 for imparting the cap nut 16 for limiting the position of the locking ball 14 is provided.

The body of the grinding tool 11 has a pair of

flanges

17a and 17b, and a groove 18a is provided between these flanges, and the length of the shaft is provided on the circumferential surface of the shaft extending toward the distal end of one flange 17b. The external teeth 18b processed in the direction are formed.

The abrasive tool 11 is a conventional consumable part that is discarded after being used for a predetermined time. The abrasive P1 in this embodiment shows that the fine metal wire is made in the form of a brush by binding metal wires. However, depending on the size and use, grinding wheels made in various shapes such as disk, cone and cup may be applied.

In addition, as illustrated in FIG. 3, the polishing tool 11 may be manufactured by separating the first body 19A on which the abrasive P1 is mounted and the second body 19B on which the external teeth 18b are formed. In addition, the shaft 20b having a slit 20a may be formed at one end of the first body 19A, and the insertion hole 20c may be formed in the second body 19B to bind to each other.

At this time, it is preferable to apply the adhesive to the slit 20a portion of the first body 19A so as to be integrally maintained in the insertion hole 20c of the second body 19B.

Four through-holes 21a are formed on one side of the body of the coupler 12 at the same circumference, and screw portions 21b and locking jaws 21c are formed at both ends thereof, respectively. A mounting hole 22a for accommodating the

flanges

17a and 17b of the grinding tool 11 is provided.

In addition, an internal tooth portion 22b is formed at the center portion connected from the seating hole 22a, and a female screw portion 22c is formed toward the rear portion thereof, and is screwed by a rotation shaft P3 mounted to the ordinary grinder main body P2. It can be fastened by fitting.

On the other hand, the locking ball 14 is accommodated in each of the four through-holes 21a formed in the coupler 12, and at the same time into the through-hole 21a of the coupler 12 during the slide movement of the sleeve 13; It is constructed so that the polishing tool 11 can be freely detached from and attached to the coupler 12 by being retracted and inserted or released into the recess 18a of the polishing tool 11.

In addition, a protruding portion 24 having an inclined surface 23a and a stepped portion 23b is formed at one side of the inner diameter portion of the sleeve 13 mounted on the circumferential surface of the coupler 12, and at the outer circumferential surface, an anti-slip portion is provided. A spring 25 is interposed between the step 23b formed in the protruding portion 24 of the sleeve 13 and the engaging step 21c formed on the circumference of the coupler 12. It is possible to move the elasticity of 13).

A cap nut 16 having a locking projection 16a is fastened to the screw portion 21b formed at the distal end portion of the coupler 12 to regulate the assembly position of the sleeve 13 and to constitute a single unit. It can be.

The configuration so far is as disclosed in Patent No. 1056036 developed by the present applicant, and the present invention is based on such a configuration to improve the performance of the above-mentioned defects in the prior art to provide a more excellent hand grinder. Can provide.

As shown in Figure 8 to Figure 14, the removal and attachment device of the grinding tool for a grinder according to the present invention, the abrasive tool 110, the grinder body P2 is mounted on one side of the body, the grinder body (P2) Coupler 120 mounted to the, a sleeve 130 for sliding on the circumferential surface of the coupler 120, and the locking ball 140 accommodated in the coupler 120 to fix or release the abrasive tool 110 And a spring 150 for providing elasticity during the slide movement of the sleeve 130 and a cap nut 160 for regulating the assembly position of the sleeve 130.

In the case of the grinding tool 110, as described above, the grinding wheel (P1) manufactured in the form of a brush, as well as the grinding wheel produced in the shape of a disk, cone, cup, etc., depending on the material or size and use of the processing object can be mounted. In one end of the body constituting the polishing tool 110, the groove 112 and the square shaft 113 including the cylindrical shaft 111 is formed in succession.

In addition, the coupler 120 has a threaded hole 121c that is coupled to the grinder main body P2 including a mounting hole 121a and a square hole 121b to which the abrasive tool 110 is fitted and fixed, and at the same time a circumferential surface thereof. Flange portions 123 including two rows of through-

holes

122a and 122b are provided on the upper surface.

Two through-

holes

122a and 122b of two rows formed on the circumferential surface of the coupler 120 may be formed along the circumferential surface of 2 to 4, respectively, and most preferably, three to be spaced apart at 120 ° intervals.

In addition, a screw thread 124a is formed at the distal end of the coupler 120, and two to four dust outlets 125 extending in the vertical direction from the square hole 121b are formed at the flange portion 123. .

The sleeve 130 is assembled on the circumferential surface of the coupler 120 and arranged to allow left and right slide movements, and a lower dustproof groove 133 and a seating groove having a step 132a on one side of the inner diameter portion 131. At the same time 134a is formed, the other side is provided with an upper dustproof groove 135.

In addition, a lower dustproof rubber 136a and a washer 136b are mounted in the lower dustproof groove 133 formed in the sleeve 130, and an upper dustproof rubber 137a is mounted in the upper dustproof groove 135, thereby grinding work. Intrusion of dust generated at the time can be suppressed, and a pair of protruding

jaws

138b and 138c bisected by the spherical concave groove 138a are formed in the inner diameter portion 131 of the sleeve 130.

The locking ball 140 is accommodated in each of the through-

holes

122a and 122b formed in the coupler 120 and emerges toward the cylindrical shaft 111 and the recess 112 of the grinding tool 110 when the sleeve 130 moves. As it is installed so as to fix or release the grinding tool (110).

In addition, the spring 150 may be disposed in the flange portion 123 of the coupler 120 and the seating groove 134a of the sleeve 130 to impart elasticity when the sleeve 130 is horizontally moved.

The cap nut 160 is fastened to the threaded portion 162a formed at the inner diameter of the protruding flange 161 on the threaded portion 124a formed at the distal end of the coupler 120 to regulate the assembly position of the sleeve 130. do.

According to the present invention configured as described above, first, the locking balls 140 are inserted into the two rows of through

holes

122a and 122b formed on the circumferential surface of the coupler 120, and the spring 150 is interposed therebetween. As the sleeve 130 is assembled to the front end side of the coupler 120 in one state, the locking balls 140 remain in a state that cannot be separated from the through

holes

122a and 122b.

Thereafter, as the cap nut 160 is fastened to the thread 124a formed at the distal end portion of the coupler 120, the cap nut 160 may be configured as a single unit as illustrated in FIG. 9. The screw hole 121c formed in the part can be fastened and mounted to the grinder main body P2.

In this state, when the polishing tool 110 is to be attached to the mounting hole 121a side of the coupler 120, the sleeve 130 is resisted against the spring 150, that is, the grinder main body P2. At the same time, the cylindrical shaft 111 of the grinding tool 110 is inserted into the seating hole 121a of the coupler 120, and can be easily attached.

That is, as shown in FIGS. 13A and 13B, when the cylindrical shaft 111 of the grinding tool 110 enters, each of the locking balls 140 is pushed outward through the through

holes

122a and 122b and the sleeve 130. ) Is temporarily moved between the projection jaw (138a, 138b), the sleeve 130 is moved back to the original position by the restoring force of the spring 150, the projection jaw (138a, 138b) push the locking ball 140 At the same time, the polishing tool 110 can be firmly fixed while moving toward the cylindrical shaft 111 and the recess 112 of the polishing tool 110.

At this time, the square shaft 113 formed at the end of the grinding tool 110 is the central portion of the inner diameter of the coupler 120 in the process of the grinding tool 110 enters the seating hole (121a) of the coupler 120 As it engages with the square hole 121b formed at the upper side, the binding state of the polishing tool 110 can be surely maintained.

Therefore, by greatly strengthening the adhesion between the polishing tool 110 and the coupler 120 that rotates at a high speed in the normal polishing operation, it is possible to minimize the shaking during the work as well as to ensure the stability, grinder body (P2) Power transfer from) can be done very smoothly.

In addition, when the grinding tool 110 is to be separated from the coupler 120, as described above, by pulling the sleeve 130 toward the grinder body (P2) to make a space for the locking ball 140 can move. After the polishing tool 110 can be easily removed by pulling out from the mounting hole (121a) of the coupler (120).

On the other hand, when various grinding operations are performed in the state where the abrasive tool 110 is mounted, dust, such as paint, powder, dust, and the like, is accumulated in the assembly gap of each component, and thus, the abrasive tool from the coupler 120. Detaching and attachment of the 110 can not be made easily.

However, in the present invention, the washer 136b including the lower dustproof rubber 136a is installed into the lower dustproof groove 133 formed in the coupler 120 and the upper dustproof rubber 137a is mounted in the upper dustproof groove 135. Since the dust can hardly penetrate into the coupler (120).

In addition, as the dust outlet 125 is formed in the flange portion 123 of the coupler 120, centrifugal force acts on the polishing tool 110 and the coupler 120 which rotate at high speed, and thus may remain inside the coupler 120. May release dust to the outside.

In addition, the cylindrical shaft 111, the groove 112, the square shaft 113 is integrally connected to one side of the body of the grinding tool 110 is maintained in the coupler 120 in the state formed in two rows of the locking ball 140 Since it is fixed by the coupler 120, there is no fear of separation from the coupler, and the existing grinding tool 110 can be used as it is, it can be compatible with consumables, as well as effectively remove the factors causing vibration. It is.

Technical problem of the present invention is achieved by the technical configuration as described above, although described by the limited embodiments and drawings, but is not limited to this and is seen by those skilled in the art to which the present invention pertains. Various modifications and variations are possible without departing from the spirit of the invention and the equivalent scope of the claims to be described below.

Claims

A conventional hand grinder configured to fix or release an abrasive tool by a slide movement of a coupler mounted on a rotating shaft of a grinder body and a sleeve assembled to an outer circumferential surface of the coupler,

The abrasive tool P1 is mounted on one side of the body, the coupler 120 mounted on the grinder body P2, the sleeve 130 slides on the circumferential surface of the coupler, and accommodated in the coupler. Locking ball 140 to secure or release the grinding tool, a spring 150 for providing elasticity when the slide movement of the sleeve, and the cap nut 160 for regulating the assembly position of the sleeve,

A groove 112 and a square shaft 113 including a cylindrical shaft 111 are successively formed at one end of the body constituting the polishing tool 110,

The coupler 120 has a screw hole 121c that is coupled to the grinder main body P2 including a mounting hole 121a and a square hole 121b to which the grinding tool 110 is fitted and fixed, and on the circumferential surface thereof. Two rows of through holes 122a and 122b and flange portions 123 are formed, respectively.

The sleeve 130 is assembled to slide left and right on the circumferential surface of the coupler 120, the lower dustproof groove 133 and the seating groove 134a having a step 132a on one side of the inner diameter portion 131 is At the same time the upper dustproof groove 135 is formed on the other side,

The locking ball 140 is accommodated in the through holes 122a and 122b formed in the coupler 120 and moved to the cylindrical shaft 111 and the recess 112 of the grinding tool 110 when the sleeve 130 is moved to polish. Configured to secure or release the tool 110,

The spring 150 is disposed in the flange portion 123 of the coupler 120 and the seating groove 134a of the sleeve 130 to impart elasticity when the sleeve 130 slides.

The cap nut 160 is attached to the distal end of the coupler 120, the removal and attachment device of the grinder grinding tool, characterized in that configured to regulate the assembly position of the sleeve (130).
The method of claim 1, wherein the flange portion 123 of the coupler 120, the dust discharge port 125 extending from the square hole (121b) to the outside, characterized in that the removal and attachment device for the grinder grinding tool.
The inner diameter portion 131 of the sleeve 130 is formed with protruding jaws (138b, 138c) bisected by a spherical concave groove (138a) to regulate the locking ball 140, the lower dustproof The lower dustproof rubber 136a and the washer 136b are mounted to the groove 133 and the upper dustproof groove 135 is equipped with the upper dustproof rubber 137a for grinder, characterized in that it is configured to suppress dust intrusion. Device for removing and attaching grinding tools.