JP2005153115A - Belt grinding tool - Google Patents

Abstract

[Object] To enable grinding without grinding any part other than the part to be ground without paying special attention during grinding work.
A belt grinding tool 1 includes a drive pulley 3 disposed on one side of a cylindrical body of a frame 2, an idle pulley 4 spaced apart from the drive pulley 3, and a drive pulley. 3 and an endless belt 5 wound around an idle pulley 4. A thin guide roller 8 is pivotally attached to a portion of the idle pulley 4. The guide roller 8 is set so that the outer diameter of the guide roller 8 is approximately equal to twice the distance L from the axis of the support shaft 6 to the outer surface of the endless belt 5. The outer surface is set so as not to protrude from a plane including both outer end portions 8 a of the guide roller 8.
[Selection] Figure 1

Description

  The present invention relates to a belt-type grinding tool for driving a belt wound around a roller to grind a workpiece.

For aircraft wing structures and the like, many rivets are beaten for design reasons, and the head (work) is ground on the rivets. In particular, in grinding work on a narrow part such as a wing structure, surface treatment or coating of a part other than the head of the rivet, that is, a structure beaten with the rivet, was performed with great care. It is necessary not to damage the part. In addition to this, in this type of grinding work, it is required to take measures to prevent dust from scattering and to prevent danger to rotating belts and the like.
However, there has conventionally been a belt-type polishing tool mainly for chamfering a fine structure portion of a precision machine part (Patent Document 1). Such a belt-type polishing tool wraps an endless belt around a driving roller and a pair of idle rollers arranged close to each other, and chamfers a short span portion of the endless belt supported by these idle rollers. However, this belt-type polishing tool has measures to prevent damage to parts that do not need to be chamfered. No special measures are taken to prevent dust from scattering and to prevent danger from rotating belts. However, it is presumed that the application is different from the belt type polishing tool described above. For example, in the belt grinder to be ground material restricting device, the dust collecting cover is covered with a dust collecting cover to prevent dust scattering. (Patent Document 2).
JP2001-191242 JP-A-9-225829

  The problem to be solved is to be able to grind so as not to damage parts other than the part to be ground without paying special attention during grinding work. In addition to this, in this kind of grinding operation, it is possible to prevent the dust from scattering and to prevent the danger of contact with the rotating belt or the like.

  According to a first aspect of the present invention, a belt-type grinding tool rotates an endless belt wound around a drive pulley provided on the base end side of a connecting member and an idle pulley provided on the front end side of the connecting member. In the belt-type grinding tool that performs grinding work at the idle pulley portion, guide rollers are provided at both ends of the spindle of the idle pulley, and the outer diameter of the guide roller extends from the axis of the spindle to the outer surface of the belt. In this way, the outer surface of the belt, that is, the abrasive grain surface in contact with the object to be ground does not protrude from the plane including both outer end portions of the guide roller. As long as the outer surface of the belt is brought into contact with the portion to be ground by regulation, grinding can be performed without damaging any portion other than the portion to be ground without paying special attention. Further, by providing the guide roller, it is possible to grind flatly without causing the grinding surface to be inclined or sag.

  A belt type grinding tool according to a second aspect of the present invention is such that the guide roller is formed in a truncated cone shape, and the side surface thereof is concave, whereby the concave surface can be easily pressed with a finger. Since the grinding operation can be performed while suppressing the tip deflection, the efficiency of the operation and the processing time can be shortened.

  According to a third aspect of the present invention, there is provided a belt type grinding tool, wherein a flexible tube and a dust suction pipe are attached to the belt type grinding tool, and an air discharge port of the flexible tube is arranged in the vicinity of an idle pulley, and dust suction of the dust suction pipe is performed. It is arranged so that the mouth faces the air discharge port and is located on the base end side from the idle pulley. Instead of adopting a configuration that covers the entire grinding tool as in the conventional example, the air discharge port of the flexible tube is used. Take a configuration suitable for holding the grinding tool in your hand so that the dust generated during grinding can be sucked into the dust suction tube while riding the air flow to the dust suction port of the dust suction tube. To prevent dust scattering.

  According to a fourth aspect of the present invention, there is provided a belt-type grinding tool that substantially surrounds a rotating endless belt and substantially surrounds a flow of dust from the air discharge port toward the dust suction port. In addition to preventing danger due to contact with the rotating belt, the dust flow is surrounded by a contact prevention bracket to further improve dust scattering countermeasures. It is.

  The belt-type grinding tool of the present invention can be ground without grinding any part other than the part to be ground without paying special attention during the grinding operation. In addition, this kind of grinding operation has the advantage that dust can be prevented from scattering and the danger of contact with a rotating belt or the like can be prevented.

A belt type grinding tool according to an embodiment of the present invention will be described with reference to FIGS. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 3B is a cross-sectional view taken along line BB in FIG.
As shown in FIG. 1, the belt-type grinding tool 1 includes a drive pulley 3 disposed on one side of a cylindrical main body of a frame 2, and an idle pulley 4 disposed separately from the drive pulley 3. And an endless belt (belt) 5 wound around the drive pulley 3 and the idle pulley 4. The drive pulley 3 is rotationally driven by an air motor (not shown) in the main body of the frame 2, and is endless. The idle pulley 4 is rotated via the belt 5. An outer surface of the endless belt 5 is formed with an abrasive surface that comes into contact with an object to be ground such as a rivet 15 (see FIG. 3). The outer surface is covered when the idle pulley 4 is wound around. Grinding work is performed by bringing it into contact with the grinding object.

  By the way, as shown in FIG. 1 (B), a part of the disk member as shown in FIG. 2 is conical at the part of the idle pulley 4 with washers 7 at both ends of the support shaft 6 of the idle pulley 4. A thin guide roller 8 processed into a trapezoidal shape is axially attached, and is secured to the support shaft 6 by an E-type retaining ring 9. The guide roller 8 is set so that the outer diameter of the guide roller 8 is approximately equal to twice the distance L from the axis of the support shaft 6 to the outer surface of the endless belt 5. The outer surface of the guide roller 8 is set so as not to protrude from a plane including both outer end portions 8 a of the guide roller 8.

  As shown in FIG. 1 (A), the belt-type grinding tool 1 has a mode that extends from the cylindrical main body of the frame 2 to the side opposite to the side where the endless belt 5 is disposed. A grip portion 10 of the grinding tool 1 is disposed, and a cover 11 having a substantially U shape is disposed on the frame 2 so as to cover the drive pulley 3. Further, the support shaft 6 of the idle pulley 4 is supported by the push rod 12, and the push rod 12 is loosely fitted in the guide tube 13 in such a manner as to protrude from the guide tube 13 fixed to the frame 2. A spring (not shown) is disposed in the guide tube 13, and the push rod 12 is urged in a direction protruding from the guide tube 13 by the spring. In the biased state of the spring, the setting described above, that is, the setting so that the outer surface of the endless belt 5 does not protrude from the plane including both outer end portions 8a of the guide roller 8 is made.

For example, when the bracket 14b is hammered with a rivet 15 on an outer plate 14a as shown in FIG. 3 and the head (work) of the rivet 15 is ground with the belt grinding tool 1, the belt grinding is performed. the tool 1 in his hand, and FIG. 3 (B) the head of the opening of the outer plate 14a is inserted from the (narrow path portion) 14a _1, rivet 15 at the outer surface of the endless belt 5 of the idle pulley 4 as The grinding operation may be performed in contact with the surface. At this time, the endless belt 5 contacts the head portion of the rivet 15 and resists the biased state of the spring, so that the endless belt 5 does not recede and protrude from the plane including both outer end portions 8a of the guide roller 8. Accordingly, as long as the outer surface of the endless belt 5 is brought into contact with the head of the rivet 15, the grinding process is performed without damaging a portion other than the head of the rivet 15, for example, the inner wall of the outer plate 14 a without paying special attention. Can do. Moreover, since the tilting of the belt-type grinding tool 1 held in the hand can be restricted by the guide roller 8, the head surface of the rivet 15 can be ground flat without being inclined or sag during grinding. .

Incidentally, instead of the guide roller 8, a guide roller 16 having the shape shown in FIG. 4 may be used. The guide roller 16 is obtained by processing one side of the disk member into a truncated cone shape, and further processing the surface 16a formed by the generatrix of the truncated cone into a concave shape. By providing the concave surface 16a, It is easy to press.
If such a guide roller 16 is used, as shown in FIG. 5, grinding operation can be performed while pressing the concave surface 16 a with a finger and suppressing the deflection of the tip of the grinding tool 1. Therefore, in addition to being able to perform grinding without damaging the inner wall of the outer plate 14a as described above, it is possible to improve work efficiency and shorten the machining time.

Next, the belt-type grinding tool 1 provided with measures for preventing dust scattering will be described with reference to FIG. However, FIG. 6A is a front view of the belt-type grinding tool 1 to which the countermeasure is taken, and FIG. 6B is a side view of the belt-type grinding tool 1 to which the countermeasure is taken.
The belt grinding tool 1 has a flexible tube 17 and a dust suction tube 18 attached to the main body of the frame 2 as a countermeasure. That is, one end 17a of the flexible tube 17 forming the air suction port is locked to the main body of the frame 2, and extends substantially parallel from the one end 17a along the endless belt 5, and the other end 17b is idled. In the present embodiment, an air discharge port is formed by attaching the nozzle 17c to the other end 17b. Further, the dust suction pipe 18 is attached to the handle portion 10 extending from the main body of the frame 2 so as to be along the handle portion 10, and the dust suction port 18 a of the dust suction pipe 18 is opposed to the nozzle 17 c on the drive pulley 3 side. It arrange | positions in the vicinity and this dust suction pipe 18 is connected to dust collection piping (not shown) to which the suction motor was attached. Incidentally, an air hose 19 to which air for driving the air motor is supplied is attached to the rear end portion of the handle portion 10, and the exhaust air of the air motor is taken in from one end 17 a of the flexible tube 17, and the exhaust air is Is discharged from the nozzle 17c of the flexible tube 17 at an appropriate speed.

  In the present belt-type grinding tool 1 to which such a flexible tube 17 and a dust suction tube 18 are attached, when the air motor is driven and the outer surface of the endless belt 5 is brought into contact with the head of the rivet 15, the flexible tube is used. Air is discharged from 17 nozzles 17c, and dust generated by the grinding process together with the discharged air rides on a flow indicated by an arrow in FIG. 6B and passes through the dust suction port 18a of the dust suction pipe 18 to the dust suction pipe 18. Since it will be attracted | sucked in, the dust generated in the case of grinding will not be scattered. In addition to this, since the discharge air has an effect of cooling the contact surface of the endless belt 5 with the head of the rivet 15, there is also an advantage that the tool life is improved and the quality of the ground surface is improved. .

Next, a description will be given of the belt-type grinding tool 1 with a risk prevention measure with reference to FIGS. However, the belt-type grinding tool 1 is provided with the flexible tube 17 and the dust suction pipe 18 described above, and therefore, measures for preventing dust scattering are further improved in addition to measures for preventing danger. 7A is a front view of the belt-type grinding tool 1 to which these measures are taken, and FIG. 7B is a side view of the belt-type grinding tool 1. FIG. Is omitted.
The aluminum contact prevention bracket 20 used for this countermeasure is configured by combining a right bracket 21 shown in FIG. 8 (A) and a left bracket 22 shown in FIG. 8 (B). Of these, the right bracket 21 includes a rectangular bottom plate 21a, a vertical plate 21b erected perpendicular to the bottom plate 21a at one long side edge of the bottom plate 21a, and an upper plate from the upper end of the vertical plate 21b. This is a member having a substantially U-shaped cross section with a rectangular top plate 21c having a long side shorter than the bottom plate 21a and extending perpendicularly to the bottom plate 21b. One end 21c of the top plate 21c along the long side 21c ₁ Is protruded with respect to the bottom plate 21a and is in an overhanging state. Further, the left bracket 22 has a rectangular bottom plate 22a, a vertical plate 22b erected perpendicularly to the bottom plate 22a on one long side edge of the bottom plate 22a, and the vertical plate substantially the same as the right bracket 21. A rectangular top plate 22c having a long side shorter than the bottom plate 22a and extending vertically to the vertical plate 22b near the one end of the vertical plate 22b at the upper end of 22b has a substantially U-shaped cross section. The left bracket 22 has a rubber rubber 23a attached to the surface of the bottom plate 22a opposite to the surface facing the top plate 22c, and the bottom plate 22a of the top plate 22c. A rubber material 23b is attached to the surface opposite to the surface facing the.

The contact preventing bracket 20 is configured such that the rubber 23a appears outside by overlapping the right bracket 21 and the left bracket 22 with the bottom plate 21a of the right bracket 21 on the bottom plate 22a of the left bracket 22, and the right bracket 21. The top plate 22c of the left bracket 22 is overlapped on the top plate 21c and the rubber 23b is combined so that the rubber plate 23b appears on the outside. Thus, the bottom plate 22a (and the bottom plate 21a), the top plate 22c (and the top plate 21c) A space to be enclosed by the vertical plate 21b of the right bracket 21 and the vertical plate 22b of the left bracket 22 is formed. Incidentally, when combined and the right bracket 21 and the left bracket 22, one end 21c ₁ of the top plate 21c is ready to protrude as shown in FIG. 7, it is achieved safety during processing. By adjusting the protrusion amount according to the machining situation, the safety during machining can be further improved.

  Such a contact prevention bracket 20 is attached as shown in FIG. 7, of which the left bracket 22 is detachably attached to the right bracket 21, and the right bracket 21 is detachably attached to the frame 2. In the present embodiment, when the right bracket 21 and the left bracket 22 are attached, the half of the endless belt 5 encloses the portion located on the drive pulley 3 side, and FIG. As shown in B), it is an aspect that encloses the portion located on the dust suction port 18a side in approximately half of the dust flow from the nozzle 17c of the flexible tube 17 toward the dust suction port 18a of the dust suction tube 18. Thereby, in addition to being able to prevent danger due to contact with the rotating belt 5, by surrounding the dust flow with the contact prevention bracket 20, it is possible to further improve dust absorption scattering countermeasures.

  In the above-described embodiment, damage to the structure is prevented by the belt 5 using the guide rollers 8 and 16 that rotate coaxially with the idle pulley 4. A crank-shaped support shaft having 16 rotation centers is used, and this support shaft is connected to the push rod 12 so as not to rotate, so that the tip of the belt 5 slightly protrudes from the guide rollers 8 and 16. Good. By projecting, the material to be ground can be further ground in the final stage of grinding. In addition, a straight guide shaft and a guide that is fixed to the push rod 12 and does not rotate may be used so that the belt 5 protrudes from the tip of the guide. At this time, a soft protective material is applied to the lower surface of the guide to prevent the material to be ground from being damaged due to contact between the guide and the material to be ground.

  Among grinding operations, especially when grinding a narrow part, it may not be easy to work so as not to damage parts other than the part to be ground. In such a case, if this belt type grinding tool is used, As long as the outer surface of the belt is brought into contact with the target portion, even a beginner can grind as a skilled person without damaging a portion other than the portion to be ground and without causing the grinding surface to be inclined or sag. Further, in this type of grinding work, there is a risk of dust scattering and contact with the rotating belt, etc., but using this belt-type grinding tool with countermeasures against these is preferable because the working environment can be improved. It can be said.

It is a block diagram of the belt type grinding tool which concerns on this Embodiment. FIG. 2 is a detailed view of the guide roller in FIG. 1. It is explanatory drawing of the usage example of the belt type grinding tool of FIG. It is a block diagram of the guide roller of a form different from the guide roller of FIG. It is explanatory drawing of the usage example of the belt type grinding tool with which the guide roller of FIG. 4 was mounted | worn. It is a block diagram of the belt type grinding tool which applied the dust scattering prevention measure. It is a block diagram of the belt type grinding tool which gave the risk prevention measure. It is a block diagram of the contact prevention bracket of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt type grinding tool 2 Frame 4 Idle pulley 5 Endless belt 6 Spindle 8, 16 Guide roller 16a Concave surface 17 Flexible tube 17b The other end (air discharge port)
18 Dust suction pipe 18a Dust inlet 20 Contact prevention bracket 21 Right bracket 22 Left bracket

Claims (4)

  In a belt-type grinding tool in which an endless belt is wound between a drive pulley provided on the base end side of a connecting member and an idle pulley provided on the front end side of the connecting member, and is rotated by the idle pulley portion. A guide roller is provided at each end of the spindle of the idle pulley, and the outer diameter of the guide roller is approximately equal to twice the distance from the axis of the spindle to the outer surface of the belt. A belt-type grinding tool.   The belt-type grinding tool according to claim 1, wherein the guide roller is formed in a truncated cone shape, and the side surface thereof is concave.   A flexible tube and a dust suction tube are attached to the belt-type grinding tool, and an air discharge port of the flexible tube is arranged near the idle pulley, and a dust suction port of the dust suction tube is opposed to the air discharge port from the idle pulley. The belt-type grinding tool according to claim 1, wherein the belt-type grinding tool is disposed on a base end side.   The contact prevention bracket is detachably attached to the frame so as to substantially surround the rotating endless belt and to substantially surround the flow of dust from the air discharge port to the dust suction port. 4. A belt-type grinding tool according to 3.

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