JPWO2007096973A1 - Dresser supply device - Google Patents

Abstract

The dresser supply device of the present invention includes: an air supply source that supplies air; a dresser supply air pipe that has a proximal end connected to the air supply source; a dresser tank that holds the dresser; and the dresser supply from the dresser tank It is connected to the air pipe at a connection portion, and the connection portion has a smaller diameter than the dresser supply air pipe, and the tip of the connection portion is inserted into and protrudes into the dresser supply air pipe and the inner peripheral surface of the dresser supply air pipe A dresser supply pipe that is positioned with a gap therebetween; and an open / close valve provided on the dresser supply air pipe between the connection portion and the air supply source side; A powder dresser for sharpening the abrasive layer. To feed.

Description

  The present invention relates to a dresser supply device that supplies a dresser to a grinding tool such as a core drill having an abrasive layer as a cutting edge tip.

  For drilling a wall of an existing concrete structure or the like, a grinding tool such as a core drill having a cutting layer tip having a grain layer in which diamond abrasive grains are bonded to a tip of a cylindrical drill body with a binder is used. In drilling with this core drill, the drill body is advanced while rotating around the central axis of the cylinder and cut into the concrete structure, so that the concrete can be drilled into the structure while excavating the concrete by the grinding action of the abrasive grains of the cutting edge tip. Cut the rebars and drill holes in the concrete walls.

  In drilling with such a core drill, drilling was conventionally performed while supplying cooling water toward the cutting edge tip in order to remove chips generated by grinding and to cool the cutting edge tip. Water may be discharged in the form of muddy water with chips and contaminate the surrounding environment. For this reason, recently, instead of such a wet method using cooling water, drilling is performed by a dry method in which compressed air is supplied for chip removal and cooling, and the discharged dust is collected by a dust collector. It's getting on. However, on the other hand, in such a dry method, the abrasive layer constituting the cutting edge tip is immediately clogged by chip dust, the grinding action is impaired, and efficient drilling cannot be performed. Arise.

  Therefore, for example, in Patent Documents 1 to 3, when drilling by a dry method, the above-mentioned during drilling is performed by intermittently supplying a proper amount of dresser (grinding material) together with compressed air to the cutting edge tip of the core drill. A perforating apparatus that promotes self-generating action of abrasive grains serving as a cutting edge while concentrating the abrasive grain layer to maintain the sharpness of the cutting edge tip and improve the perforating efficiency, and a dresser supply apparatus therefor have been proposed . Further, the inventors of the present invention also use a perforation apparatus equipped with such a dresser supply device and ultrafine anhydrous silica having a particle size of 5 to 50 nm having a silanol group on the surface as the dresser in Patent Document 4. Propose that.

  However, among these, in the dresser supply devices described in Patent Documents 2 to 4, the tank holding the dresser is only connected via a valve to a supply pipe that supplies compressed air toward the core drill. For this reason, in order to supply the dresser intermittently, the valve must be frequently opened and closed, and since the supplied hard dresser is the same as the abrasive, the valve body of the valve bites into the dresser to ensure There is a risk that the valve cannot be opened and closed properly, or that the valve is damaged and the dresser cannot be supplied at an early stage.

  On the other hand, in Patent Document 1, in addition to the one in which the tank of the dresser is connected to the compressed air supply pipe via the valve, the supply pipe is connected to the core drill side from the valve by a three-way valve type solenoid valve. It branches to an air supply line headed to and a dresser supply line arranged between the air supply line and the valve, and a dresser tank is connected to the dresser supply line via a T-shaped discharge nozzle. A supply device is also described in which a branch pipe is branched from the discharge nozzle and valve of the dresser supply line and connected to the upper end of the dresser tank. In this dresser supply device, when the compressed air passes through the air supply line, the dresser is not supplied. On the other hand, when the compressed air flows into the dresser supply line by switching the solenoid valve, a part of the compressed air flows into the dresser tank from the branch pipe. The pressure in the tank becomes the same as the pressure of the discharge nozzle, whereby the dresser is discharged to the main pipe of the dresser supply line and supplied to the core drill side by the remaining compressed air flowing through the main pipe.

  However, in this dresser supply device, since the connection between the dresser tank and the main of the dresser supply line is simply a T-shaped discharge nozzle, the discharge from the dresser tank to the main of the dresser supply line is performed every time the solenoid valve is switched. It is difficult to accurately control the discharge amount of the dresser to be discharged, that is, the supply amount of the dresser that is intermittently supplied to the core drill so as to always be a constant amount. For this reason, if the supply amount of the dresser is small, the abrasive layer is not sufficiently conspicuous and the sharpness of the cutting edge tip cannot be maintained. Conversely, if the supply amount is too large, the abrasive grains are larger than necessary. The layer is conspicuous and wears, which can significantly shorten the life of the core drill.

Further, in this dresser supply device, since it is difficult to control the discharge amount of the dresser in this way, there is a possibility that the dresser may discharge a large amount from the dresser tank at once. The dresser discharged in a large amount in this way closes the main pipe by forming a bridge. Therefore, in this case, since the subsequent dresser supply becomes impossible, the drilling operation must be interrupted once and the dresser having the bridge formed must be removed, resulting in a significant reduction in work efficiency.
Japanese Patent Publication No. 8-18326 Japanese Patent Publication No. 8-18327 Japanese Patent No. 2549787 JP 2002-370167 A

  The present invention has been made under such a background, and when grinding with a grinding tool such as the above-described drilling with a core drill, the dresser is intermittently supplied to the abrasive layer more accurately and reliably. It aims at providing the dresser supply apparatus which can supply a fixed amount of dressers.

  In order to solve the above-described problems and achieve such an object, the present invention provides a dresser supply device for supplying a powdery dresser to a grinding tool having an abrasive layer as a cutting edge tip. An air supply source for supplying the air; a dresser supply air pipe having a proximal end connected to the air supply source; a dresser tank for holding the dresser; and a connection between the dresser tank and the dresser supply air pipe; The connecting portion with the dresser supply air pipe is smaller in diameter than the dresser supply air pipe, and its tip is inserted into and protrudes into the dresser supply air pipe and between the inner peripheral surface of the dresser supply air pipe A dresser supply pipe positioned at an interval between the dresser supply air pipe and the dresser supply pipe. Comprises; a connecting portion between Sir supply pipe and the opening and closing valve provided in the dresser supply air pipe between the air supply source side.

  The supply device of the present invention may further include a control device that opens and closes the opening / closing valve intermittently. When the open / close valve is opened, air from the air supply source is introduced into the dresser supply air pipe, and the dresser supplied from the dresser tank through the dresser supply pipe into the dresser supply air pipe is accompanied by the air. Supplied to the grinding tool. At this time, the open / close valve is disposed in the dresser supply air pipe on the air supply source side, that is, on the upstream side of the connection portion with the dresser supply pipe to which the dresser is supplied, so that the dresser passes through the open / close valve. The open / close valve is not damaged by the biting of the dresser.

  Next, when the on-off valve is closed, a powdery dresser is supplied from the dresser tank via the dresser supply pipe, and is held in the dresser supply air pipe at a connection portion with the dresser supply pipe. At this time, in the present invention, the dresser supply pipe has a smaller diameter than the dresser supply air pipe, and the tip of the dresser supply pipe projects into the dresser supply air pipe with a gap from the inner peripheral surface of the dresser supply air pipe. Since it is inserted, the dresser forms a cone between the tip of the dresser supply pipe and the inner peripheral surface of the dresser supply air pipe with a taper angle corresponding to the angle of repose.

  The cone thus formed is stabilized by forming a bridge between the tip of the dresser supply pipe and the inner peripheral surface of the dresser supply air pipe, so that a large amount of dresser exceeding the volume of the cone is supplied at once. There is nothing. Accordingly, the distance between the tip of the dresser supply pipe and the inner peripheral surface of the dresser supply air pipe is determined according to the amount of the dresser supplied to the grinding tool side. By setting the amount to be constant, it becomes possible to always supply a certain amount of dresser accurately into the dresser supply air pipe.

  On the other hand, when the dresser supply pipe with a small diameter protrudes and is inserted into the dresser supply air pipe, the dresser is supplied into the dresser supply air pipe at the connection portion between the dresser supply pipe and the dresser supply air pipe. Even if the cone is formed, a gap is formed between the inner peripheral surface of the dresser supply air pipe and the outer peripheral surface of the dresser supply pipe. Moreover, the area of the gap is smaller than the cross-sectional area in the dresser supply air pipe. Therefore, when the opening / closing valve is opened next, the air introduced into the dresser supply air pipe pushes down the conical dresser when passing through the connecting portion, or the gap having a small area. As the flow velocity increases when passing through the part, the dresser is wound up and supplied to the grinding tool side together with the dresser.

  Thus, according to the dresser supply device of the present invention, a certain amount of dresser can be accurately supplied to the dresser supply air pipe by intermittently opening and closing the open / close valve, and the dresser can be reliably ground by air. It can be supplied to the tool side. Therefore, the abrasive layer forming the cutting edge tip of a grinding tool such as a core drill can be sharpened without causing excessive wear, and grinding can be performed while maintaining its sharpness. It is possible to extend the tool life and perform stable and efficient grinding operations such as drilling.

  Here, the interval between the tip of the dresser supply pipe and the inner peripheral surface of the dresser supply air pipe may be adjustable. In this case, even if various conditions during grinding work such as drilling with a core drill occur, the dresser can be intermittently supplied at the optimum supply amount by adjusting the interval accordingly. It becomes possible to supply to.

  An air supply pipe provided with a pressure control valve for connecting a region between the opening / closing valve and an air supply source and a region between the connecting portion and the tip on the grinding tool side of the dresser supply air pipe. May be provided. By reducing the pressure of the air flowing through the air supply pipe by the pressure control valve, the air introduced into the dresser supply air pipe becomes higher than the air supply pipe when the open / close valve is opened. Accordingly, the dresser supplied to the connecting portion can be reliably supplied to the grinding tool from the connecting portion of the dresser supply air pipe and the air supply pipe on the grinding tool side via the air supply pipe.

  Further, when the air supply pipe is connected in this way, a dresser tank connection tube that communicates between the connection portion of the dresser supply air pipe with the dresser supply pipe and the tip and the inside of the dresser tank is provided. It may be connected. When the open / close valve is closed, the pressure of the air flowing in the air supply pipe instantaneously becomes higher than that of the dresser supply air pipe, and this high pressure air is transferred from the connecting part on the grinding tool side of both pipes to the dresser supply air pipe. Inflow. However, when the dresser tank connection tube is connected, the air flowing into the dresser supply air pipe from the air supply pipe is introduced into the dresser tank from the dresser tank connection tube, and the dresser held in the dresser tank Impact by air hammer acts. Accordingly, since the dresser supply pipe has a small diameter as described above, even if the dresser forms a bridge in the dresser supply pipe, the bridge is broken by the impact of the air hammer action, and the dresser tank It is possible to push out the dresser by the pressure of the air introduced into the air, and to surely supply an appropriate amount of the dresser to the dresser supply air pipe.

  As described above, according to the present invention, a certain amount of dresser can be intermittently supplied to the grinding tool side reliably and accurately. Therefore, it is possible to perform drilling or the like while conspicuous without causing excessive wear of the abrasive layer forming the cutting edge tip of a grinding tool such as a core drill. For this reason, since grinding can be performed while maintaining the sharpness of the cutting edge tip, stable and efficient grinding can be achieved while extending the tool life.

It is a schematic structure figure showing one embodiment of the present invention. It is a figure which shows the dresser supply air pipe and air supply pipe of embodiment shown in FIG. It is a partially broken figure which shows the connection part of embodiment shown in FIG. It is the figure which looked at the connection part of embodiment shown in FIG. 1 from the extending direction of a dresser supply air pipe.

Explanation of symbols

1 Dresser tank 2 Air compressor (Air supply source)
3 Dresser supply air pipe 3A to 3D fitting 4 Air supply pipe 4A Ball valve (pressure control valve)
6 Dresser supply pipe 6A Coupling member 6B Pipe body 7 Solenoid valve (open / close valve)
8 Control device 9 Dresser tank connection tube 10 Drilling tool (grinding tool)
AC connection part E dresser S dresser supply device

  1 to 4 show an embodiment of the present invention. As shown in FIG. 1, the dresser supply apparatus S of this embodiment is connected to a dresser tank 1 for holding a powdery dresser E, an air compressor 2 as an air supply source, and the air compressor 2 to the grinding tool side. Of the dresser supply air pipe 3 and the air compressor 2 side and the grinding tool side of the dresser supply air pipe 3, both ends of which are connected at connecting portions A and B, respectively, and the air supply extending in parallel with the dresser supply air pipe 3 A pipe 4 is provided, and these are mounted on and integrated with a portable frame 5. The dresser supply air pipe 3 is connected to the dresser tank 1 via the dresser supply pipe 6 at the connection portion C between the connection portions A and B.

  As shown in FIG. 2, the dresser supply air pipe 3 is connected to a straight pipe or a coupling made of a steel pipe or the like and T-shaped pipe joints 3 </ b> A to 3 </ b> D, and extends in a horizontally extending direction as a whole. It is arranged sideways like this. In the connecting portions A and C, straight pipe portions extending in a straight line of the pipe joints 3A and 3C are arranged along the extending direction. In the connection part B, the branch part extended perpendicularly | vertically from the said straight pipe part of the pipe joint 3B is made to follow the said extending direction. In particular, the branch portion of the pipe joint 3C in the connection portion C is directed vertically upward. A T-shaped pipe joint 3D is also interposed between the connection parts B and C to constitute the connection part D. The pipe joint 3D in the connection portion D is also connected so that the straight pipe portion is along the extending direction and the branch portion is vertically upward.

  A solenoid valve 7 is interposed between the connection parts A and C of the dresser supply air pipe 3, that is, at a portion closer to the grinding tool than the connection part A with the air supply pipe 4 as an on-off valve in the present embodiment. The solenoid valve 7 is opened and closed intermittently and instantaneously at preset time intervals by the control device 8 shown in FIG. 1 equipped with a timer or the like, and a part of the air supplied from the air compressor 2 is removed. Control is performed so as to repeat the operation of introducing the connection portion A into the dresser supply air pipe 3 and the operation of suppressing the introduction.

  The air supply pipe 4 extends from the branch portion of the pipe joint 3A in the connection portion A so as to be connected to the straight pipe portion of the pipe joint 3B in the connection portion B, and always supplies the air supplied from the air compressor 2 to the grinding tool. To be fed to the side. However, a ball valve 4A is interposed between the connecting portions A and B in the air supply pipe 4 as a pressure control valve in the present embodiment. The pressure of the air supplied to the grinding tool side through the air supply pipe 4 can be reduced by this ball valve 4A.

  In the connection part A on the air compressor 2 side between the air supply pipe 4 and the dresser supply air pipe 3, the pipe joint 3A may not have the branch portion facing upward. Even in the connecting portion B on the grinding tool side between the air supply pipe 4 and the dresser supply air pipe 3, the pipe joint 3B may or may not have the straight pipe portion to which the air supply pipe 4 is connected oriented in the vertical direction. . In this embodiment, the pipe joints 3A and 3B are oriented in the horizontal direction perpendicular to the extending direction of the dresser supply air pipe 3. As long as the air supply pipe 4 can sufficiently withstand the pressure of the supplied air, a part of the air supply pipe 4 may be a flexible pipe such as the nylon pressure-resistant tube 4B shown in FIG.

  The dresser tank 1 has a conical funnel at the bottom and a cylinder at the top. The dresser tank 1 is provided with a dresser E inlet at its upper end, which can be hermetically closed by a lid 1A. The dresser E which is introduced from the inlet and held in the dresser tank 1 is made of ultrafine anhydrous silica having a silanol group on the surface and a particle size of 5 to 50 nm as described in Patent Document 4, for example. Is preferably used.

  On the upper end side of the dresser tank 1, a dresser tank connecting tube 9 made of a material having flexibility and pressure resistance, such as the nylon pressure-resistant tube, is located above the dresser held in the dresser tank 1. Are connected at one end. The other end of the dresser tank connecting tube 9 is connected to the branch portion of the pipe joint 3D in the connecting portion D, and the grinding tool is more than the connecting portion C between the dresser supply pipe 6 and the dresser supply air pipe 3 extending from the dresser tank 1. On the side, it is connected to a dresser supply air pipe 3.

  A dresser tank supply pipe 1B extends vertically downward from the lower end of the conical funnel-shaped lower portion of the dresser tank 1, and the lower end of the branch portion of the connecting portion C that is directed vertically upward of the T-shaped fitting 3C. It arrange | positions so that it may oppose on the same axis at intervals with an upper end. The dresser supply pipe 6 is interposed between the dresser tank supply pipe 1 </ b> B and the pipe joint 3 </ b> C at the connection portion C to connect the dresser tank 1 and the dresser supply air pipe 3.

  As shown in FIG. 3, the dresser supply pipe 6 has male screw portions formed on the outer periphery of both ends in the central axial direction, and the outer periphery of the central portion between these male screw portions is a nut portion. And a pipe body 6B comprising a cylindrical straight pipe such as a steel pipe fitted in and attached to the through hole of the coupling member 6A. It consists of and. The pipe body 6B has not only the inner diameter but also the outer diameter smaller than that of the dresser supply air pipe 3, more specifically smaller than the inner diameter of the pipe joint 3C in the connecting portion C. The male screw portions at both ends of the coupling member 6A are twisted in the same direction at the same pitch.

  Such a dresser supply pipe 6 includes the male screw portions at both ends of the coupling member 6A, the female screw portion formed on the inner periphery of the lower end of the dresser tank supply pipe 1B, and the branch portion of the pipe joint 3C of the connection portion C. It is screwed into a female thread portion formed on the inner periphery, and is interposed between the dresser tank supply pipe 1B and the pipe joint 3C. Accordingly, the inside of the dresser supply pipe 6 and the inside of the dresser tank 1 are airtight with the inside of the pipe joint 3C of the connecting portion C, that is, the inside of the dresser supply air pipe 3 through the inner peripheral portion of the pipe body 6B of the dresser supply pipe 6. To communicate with.

  At the upper end portion of the dresser supply pipe 6 connected to the dresser tank supply pipe 1B, the upper end surfaces of the coupling member 6A and the pipe body 6B are flush with each other, while the pipe joint 3C of the connection portion C is provided. At the lower end connected to the pipe, the pipe body 6B protrudes from the lower end surface of the coupling member 6A and is inserted into the pipe joint 3C. The tip (lower end) of the pipe body 6B is connected to the inner peripheral surface (inner bottom surface) of the pipe joint 3C. They are arranged so as to be positioned with a slight gap G between them. The interval G is adjusted by moving the dresser supply pipe 6 up and down by adjusting the screwing positions of the male screw parts at both ends of the coupling member 6A and the female screw parts of the dresser tank supply pipe 1B and the pipe joint 3C. It is possible.

  The grinding tool to which the dresser E is supplied by the supply device configured as described above is a drilling tool 10 such as a core drill that drills a wall W or the like in a concrete structure as shown in FIG. 1 in this embodiment. In this drilling tool 10, a cutting edge tip 12 formed of an abrasive layer in which hard abrasive grains such as diamond abrasive grains are bonded to an end edge of a cylindrical tool body 11 with an appropriate binder is provided in the circumferential direction. It is assumed that two or more are attached at intervals. In such a drilling tool 10, the rear end portion of the tool main body 11 is attached to the rotation shaft of the drilling device 13, and is advanced around the drilling device 13 in the axial direction while rotating around the axis, so that the cutting edge tip 12 is moved to the wall. By cutting into W, a hole is made in the wall W by the grinding action of the abrasive layer while leaving a cylindrical core on the inner periphery of the tool body 11.

  A swivel 13 </ b> A is provided at an attachment portion of the drilling device 13 with the tool body 11. The swivel 13 </ b> A is connected via an air hose 14 to an end portion of the air supply pipe 4 of the dresser supply device S that is provided closer to the grinding tool than the connection portion B. On the other hand, a cover 15 is provided at a portion to be drilled on the wall W so as to cover the outer periphery of the tool body 11 of the drilling tool 10 into which the cutting edge tip 12 is cut. The cover 15 is connected to a suction device 18 via a dust collector 17 such as a cyclone by a dust hose 16.

  The air supplied from the dresser supply device S and the dresser E accompanying the air are introduced into the inner peripheral portion of the tool main body 11 through the swivel 13 and from the gap between the tool main body 11 and the core. It is supplied to the grinding site by the cutting edge tip 12. The ground portion is cooled by air, and the abrasive layer of the cutting edge tip 12 is dressed by the dresser E. Thus, the dresser E dressing the abrasive layer, the dressing waste, the dropped abrasive grains, and the chips generated by grinding with the cutting edge tip 12 are discharged into the cover 15 along with the air sucked by the suction device 18. Further, the air is collected by the dust collector 17 while being sucked through the air hose 14.

  In the supply device for the dresser E having the above-described configuration, the solenoid valve 7 is intermittently and instantaneously opened and closed while the air compressor 2 is driven and air is always supplied to the air supply pipe 4 as shown by a broken line in FIG. . Thus, when the solenoid valve 7 is opened, a part of the air is introduced into the dresser supply air pipe 3 as shown by a chain line in FIG. 2, and the dresser E that has been supplied to the connection portion C of the dresser supply air pipe 3. Is sent to the drilling tool (grinding tool) 10 side together with air. Since the solenoid valve 7 is disposed closer to the air compressor 2 as an air supply source than the connection portion C, the dresser E will not be bitten by the solenoid valve 7, and the solenoid valve 7 will be damaged. It is possible to perform a stable opening and closing operation over a long period of time.

  When the solenoid valve 7 is closed, the dresser E is supplied from the dresser tank 1 to the connection portion C of the dresser supply air pipe 3 through the dresser supply pipe 6. At this time, in the supply device, the pipe body 6B of the dresser supply pipe 6 inserted through the dresser supply air pipe 3 at the connection portion C is smaller in diameter than the dresser supply air pipe 3, and the tip thereof is the dresser supply air pipe 3. Since the gap G is slightly spaced from the inner peripheral surface, the supplied powdery dresser E forms a bridge between the pipe body 6B and the inner peripheral surface of the dresser supply air pipe 3, As shown in FIG. 3, a constant volume having a taper angle corresponding to the angle of repose and having a vertex at the tip, that is, a cone made of a certain amount of dresser E is stably formed each time the dresser supply air pipe 3 is supplied. To do.

  A small-diameter pipe body 6 </ b> B of the dresser supply pipe 6 protrudes and is inserted into the dresser supply air pipe 3. Therefore, even when the dresser E is supplied, the outer periphery of the pipe body 6B protruding into the dresser supply air pipe 3 is disposed on the outer periphery of the dresser supply air pipe 3 as shown in FIG. The gap F is always formed between the inner peripheral surface 3 and the inner peripheral surface 3. For this reason, the dresser supply air pipe 3 is not blocked by the dresser E. Moreover, since the area of the gap F is smaller than the cross-sectional area of the dresser supply air pipe 3, when the solenoid valve 7 is opened and the air introduced into the dresser supply air pipe 3 passes through the connecting portion C, the flow velocity is increased. Speeded up. Therefore, the cone of the supplied dresser E can be crushed to wind up the dresser E, and the air can be reliably supplied to the grinding tool side together with air.

  According to such a supply device for the dresser E, a certain amount of the dresser E can be intermittently and accurately supplied to a grinding tool such as a core drill. This makes it possible to perform grinding operations such as drilling while sharpening the abrasive layer forming the cutting edge tip without excess or deficiency. Therefore, it is possible to proceed with the work while maintaining the sharpness of the cutting edge tip always sharply, coupled with the fact that the cutting edge tip and the grinding part are cooled and the chips are discharged by the constantly supplied air. In addition, it is possible to stably and efficiently perform grinding by a dry method that is less likely to contaminate the surrounding environment while extending the tool life.

  In the supply device of the embodiment, the pipe body 6B of the dresser supply pipe 6 is attached to a coupling member 6A that is screwed into the joint 3C at the connection portion C of the dresser tank supply pipe 1B and the dresser supply air pipe 3. The distance G can be adjusted by adjusting the screwing amount of the coupling member 6A to advance and retract. Therefore, even if the grinding conditions such as the type of dresser E, the outer diameter of the core drill, and the rotational speed change, the dresser E can be intermittently supplied to the grinding tool side with an appropriate supply amount accordingly. An efficient grinding operation can be stably performed regardless of conditions.

  For example, when the dresser supply air pipe 3 has an inner diameter of 11 mm, the outer diameter of the pipe body 6B of the dresser supply pipe 6 is 6 mm, the inner diameter is 4 mm, and the ultrafine powder anhydrous silica having a particle size of about # 60 is used as the dresser E, The gap G is adjusted to 3.5 mm. Between the tip of the pipe body 6B and the inner peripheral surface of the dresser supply air pipe 3 (the pipe joint 3C), about 2 g of the dresser E is supplied as an intermittent supply. It is discharged from the dresser supply pipe 6 to form the cone.

  In this embodiment, the air supply pipe 4 is connected between the connection portions A and B on the air compressor 2 side and the grinding tool side of the dresser supply air pipe 3, and the air is always supplied to the grinding tool side. Even when the valve 7 is closed, the cutting edge tip 12 can be cooled and chips can be discharged reliably. The air supply pipe 4 is provided with a ball valve 4A as a pressure control valve. When the solenoid valve 7 is opened by reducing the pressure of the air flowing through the air supply pipe by the ball valve 4A, it is introduced into the dresser supply air pipe 3 and is accompanied by the dresser E with the side of the grinding tool with the air supply pipe 4 The pressure of the air reaching the connection part B becomes higher than the pressure of the air flowing through the air supply pipe 4. Accordingly, the dresser E supplied to the connection portion C can be reliably supplied to the grinding tool from the connection portion B on the grinding tool side via the air supply pipe 4 and the air hose 14.

  On the other hand, when the solenoid valve 7 is closed, the supply of air to the dresser supply air pipe 3 is closed, and the pressure of the air flowing in the air supply pipe 4 instantaneously becomes high pressure. It flows into the dresser supply air pipe 3 from the connection part B. However, in the present embodiment, a dresser tank connection tube 9 communicating with the interior of the dresser tank 1 is connected to the dresser supply air pipe 3 at the connection portion D between the connection portions C of the connection portion B and the dresser supply pipe 6. Yes. Therefore, the high-pressure air that has flowed into the dresser supply air pipe 3 is introduced into the dresser tank 1 from the dresser tank connection tube 9 as shown by a broken line in FIG. 2, and the dresser E held in the dresser tank 1. A shock is applied to the air hammer.

  For this reason, even if the pipe body 6B of the dresser supply pipe 6 has a small diameter as described above and the dresser E easily forms a bridge inside the dresser E, it is easy to cause clogging. When the valve 7 is closed, the bridge in the pipe main body 6B is broken by the impact, and the dresser E is pushed out by the pressure of the air introduced into the dresser tank 1, so that an appropriate amount of the dresser E is more reliably supplied to the dresser supply air. It is possible to supply to the pipe 3 and further intermittently to the grinding tool side.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the scope of the appended claims.

  According to the present invention, a certain amount of a dresser can be intermittently supplied to the grinding tool side reliably and accurately, and the abrasive layer forming the cutting edge tip of the grinding tool is caused to wear more than necessary. Grinding can be performed while conspicuous without any need. Therefore, stable and efficient grinding can be performed while maintaining the sharpness of the cutting edge tip while extending the tool life. In addition to the drilling tool 10 such as the core drill that drills while forming the core as described above, the present invention provides a drilling tool that drills without forming such a core, or a concrete structure. The present invention can also be applied when other types of grinding tools having an abrasive layer as a cutting edge tip, such as a blade for cutting an object, a wire saw, or the like, are used in a dry method.

Claims (6)

A dresser supply device for supplying a powdery dresser to a grinding tool having an abrasive layer as a cutting edge tip,
An air supply source for supplying air;
A dresser supply air pipe having a proximal end connected to the air supply source;
A dresser tank holding the dresser;
The dresser tank and the dresser supply air pipe are connected to each other, and the connecting portion with the dresser supply air pipe is smaller in diameter than the dresser supply air pipe, and the tip thereof is inserted into the dresser supply air pipe. And a dresser supply pipe that protrudes and is spaced from the inner peripheral surface of the dresser supply air pipe;
A dresser supply device for a grinding tool, comprising: an opening / closing valve provided on the dresser supply air pipe between a connection portion between the dresser supply air pipe and the dresser supply pipe and the air supply source side.   The dresser supply device according to claim 1, further comprising a control device that intermittently opens and closes the opening / closing valve.   The dresser supply device according to claim 1, wherein the distance between the tip of the dresser supply pipe and the inner peripheral surface of the dresser supply air pipe is adjustable.   An air supply pipe having a pressure control valve for connecting a region between the opening / closing valve and the air supply source and a region between the connection portion and the tip on the grinding tool side of the dresser supply air pipe; The dresser supply device according to claim 1, further comprising:   The dresser tank connection tube which connects between the said connection part of the said dresser supply air pipe with the said dresser supply pipe, and the said front-end | tip, and the inside of the said dresser tank is connected to Claim 4 characterized by the above-mentioned. The dresser supply device described.   The downstream connection portion between the dresser supply air pipe and the air supply pipe is located downstream of the connection portion between the dresser tank connection tube and the dresser supply air pipe. Dresser supply device.

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