JP2017196846A - Liquid pouring mechanism and punching machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid pouring mechanism with a simple structure that can pour a liquid to a tip tool in work and has the tip tool easily attached and detached.SOLUTION: When a drill blade edge is not mounted, a tip tool mounting hole 152B is a cavity. In this case, the front of a valve piece 153 is locked by a first O ring 157 nearby the outer periphery thereof. While the valve piece 153 moves back, a second O ring 158 moves back and is positioned in a recessed part 152F. Consequently, regions before and behind the second O ring 158 communicate in a valve piece chamber 152A, and then water flows to before the second O ring 158. The part between an outer peripheral surface of the drill tip edge and an inner peripheral surface of a tip part 152 is sealed with the first O ring 157 and a third O ring 159.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a liquid injection mechanism that injects liquid into a detachable tip tool, and a structure of a drilling machine that uses this liquid injection mechanism to drill a tile, concrete, or the like.

  In operations using a drilling machine (drill, etc.), the front end of the driven drill blade (tip tool) is pressed against the tile or concrete (drilled object) in front of the drilled object. And drill. At this time, since the drill blade tip is a consumable item, or an optimum one is selected and used in accordance with the work content, the drill tip can be easily replaced. For this reason, as described in Patent Document 1, for example, the drill blade tip can be easily attached to and detached from the tip tool holding portion driven by the power source. Moreover, in order to collect the dust etc. which generate | occur | produce at the time of a drilling operation | work, the dust-absorbing cover part which surrounds a drill blade tip at the time of a drilling operation | work and collects dust is used.

  On the other hand, as described in Patent Document 2, in the drilling operation, in order to easily perform drilling, to suppress heat generation due to friction during drilling, or to suppress dust scattering, Water injection is effective. In the technique described in Patent Document 2, water can be automatically injected into a portion to be drilled during the drilling operation, while water is ejected from the bellows structure that surrounds the drill blade tip and abuts the object to be drilled during the drilling operation.

JP 2008-207288 A JP 2014-14892 A

  In the technique described in Patent Document 2, since the bellows structure is separately provided, the structure is complicated. Furthermore, when a structure for absorbing dust such as that used in the structure described in Patent Document 1 is further provided around the bellows structure, the structure becomes extremely complicated and the handling thereof is not easy.

  If water is injected from the tip of the drill blade tip (water is ejected), it is easy to provide a structure for absorbing dust around it, and handling is also easy. For this purpose, a water injection (liquid injection) mechanism that can inject water into the drill blade edge when the drill blade edge is mounted may be configured including the tip tool holding portion.

  However, as described above, the drill blade tip is required to be easily detachable from the tip tool holding portion, and at the time of mounting, the drill blade tip is required to be firmly fixed to the tip tool holding portion. At this time, water is ejected when drilling is performed, but it is preferable that water does not leak when water is unnecessary.

  The structure of the water injection mechanism that satisfies these requirements has become complicated, and the mechanically driven part has such a complicated structure, which makes it easy for failures to occur. For this reason, it has been desired to obtain a liquid injection mechanism having a simple structure that can inject liquid into the tip tool during operation and that allows easy attachment / detachment of the tip tool.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
The liquid injection mechanism according to the present invention includes a cylindrical tip tool holding portion to which a tip tool extending along one direction is inserted and attached to one end side in the one direction, and the tip tool is driven A liquid injection mechanism for supplying a liquid to the tip tool via the tip tool holding portion, and a first flow path provided on the tip tool holding portion side through which the liquid flows, and an inside of the tip tool The tip tool holding portion is movable along the one direction, and the tip tool is mounted on the tip tool holding portion. Sealing between the first flow path and the second flow path when positioned on the end side suppresses the inflow of the liquid into the second flow path, and when positioned on the one end side, By releasing the seal between the first flow path and the second flow path, A valve piece that allows the liquid to flow into the second flow path; and the valve piece is locked on the other end side in a state in which the tip tool is not mounted on the tip tool holding portion; A first seal that seals between the outer periphery of the tip tool and the inner surface of the tip tool holding portion in a state of being mounted on the tip tool holding portion and suppresses the outflow of the liquid to the outer periphery of the tip tool. And a member.
In the liquid injection mechanism of the present invention, the valve piece is configured to move toward the one end side by being urged toward the other end side and pushed toward the one end side by the tip tool. To do.
In the liquid injection mechanism of the present invention, the tip tool holding portion is provided in the valve piece on the one end side with respect to the first sealing member in the one direction, and includes the first flow path and the second flow path. It has the 2nd sealing member which seals between.
In the liquid injection mechanism of the present invention, the valve piece is slidable along the inner surface of the tip tool holding portion.
In the liquid injection mechanism of the present invention, the first sealing member is an O-ring attached to the inner surface.
In the liquid injection mechanism of the present invention, the second sealing member is an O-ring attached to the outer surface of the valve piece.
In the liquid injection mechanism according to the present invention, the inner surface is provided with a recess along a circumferential direction around the one direction, and the second sealing is performed when the valve piece is positioned on the other end side. The member is positioned at a position that does not overlap with the recess in the one direction and seals between the inner surface and the valve piece. When the valve piece is positioned on the one end side, the second sealing is performed. The member is located at a position overlapping with the recess in the one direction, and a gap is formed between the second sealing member and a bottom surface of the recess.
In the liquid injection mechanism of the present invention, the concave portion has a configuration in which a depth perpendicular to the one direction increases toward the one end side.
The drilling machine of the present invention is characterized in that the liquid injection mechanism and the tip tool for drilling at the other end are used.

  Since the present invention is configured as described above, it is possible to obtain a liquid injection mechanism having a simple structure that can inject liquid into the tip tool during operation and that allows easy attachment and detachment of the tip tool.

It is a side view which shows the structure of the drilling machine used as embodiment of this invention. It is sectional drawing which shows the structure at the time of drilling | wearing of the drilling machine which is embodiment of this invention when the drill blade tip is not mounted | worn (a), at the time of drill blade tip mounting | wearing and non-drilling work (b), and drilling work. . It is sectional drawing which expands and shows the structure of the front-end | tip tool holding | maintenance part area | region at the time of the drill blade tip not mounting | wearing of the drilling machine used as embodiment of this invention. It is sectional drawing which expands and shows the structure of the front-end | tip tool holding | maintenance part periphery at the time of mounting | wearing of a drill blade edge | tip and the non-drilling operation | work of the drilling machine used as embodiment of this invention. It is sectional drawing which expands and shows the structure of the front-end tool holding | maintenance part periphery at the time of a drilling operation | work of the drilling machine used as embodiment of this invention.

  A liquid injection mechanism according to an embodiment of the present invention and a configuration of a drilling machine using the same will be described. FIG. 1 is a side view showing a form of this drilling machine (drill) 1. An elongated drill blade tip (tip tool) 11 having a central axis along the front-rear direction is attached to the front end (tip) of the drilling machine 1. The drill cutting edge 11 is rotationally driven around its central axis by a power source (motor: not shown) provided in the drilling machine main body 20 in the drilling machine 1. This central axis is the front-rear direction in the state of FIG.

  A handle 21 extending downward is fixed to the lower side of the punching machine main body 20, and an operator can hold the handle 21 and perform a drilling operation. A battery 22 serving as a power source for driving the motor is attached to the lower portion of the handle 21. Although the weight of the battery 22 is large, by attaching the battery 22 to the lowermost part of the drilling machine 1 in this way, an operator can stably hold the drilling machine 1 at the time of work, and the drilling work can be stably performed. It can be carried out. In addition, a trigger 23 that operates as a switch for controlling on / off of the driving of the drill blade tip 11 is mounted in front of the handle 21 in the vicinity of the connection portion with the drilling machine main body 20. The operator can operate the trigger 23 while holding the handle 21.

  Further, on the front end side of the drill blade tip 11, a dust-absorbing cover portion 12 that surrounds the drill blade tip 11 around its central axis is mounted. The dust-absorbing cover 12 is attached to the dust-absorbing cover support 13 that extends parallel to the drill blade 11 above the drilling machine body 20 and is attached to the drilling machine body 20. The dust-absorbing cover support portion 13 is formed in a cylindrical shape, and sucks dust generated from the periphery of the drill cutting edge 11 during drilling by being connected to a dust absorber provided separately from the drilling machine 1. Can do. A dust suction hose 14 is connected to the dust suction cover 12, and when drilling while supplying water around the drill cutting edge 11, water mixed with dust can be discharged from the dust suction hose 14 to the outside by gravity. In the drilling operation, the operator grasps the handle 21 and pushes the drilling machine main body 20 forward to bring the front end of the drill blade 11 into contact with the drilled object, and the front end of the dust-absorbing cover 12 is the drilled object. It is locked to. Here, the dust-absorbing cover support portion 13 includes a dust-absorbing cover-support base 13A fixed to the drilling machine main body 20, and a front-rear direction with respect to the dust-absorbing-cover-support base 13A in front of the dust-absorbing cover support base 13A. The dust-absorbing cover support part tip part 13B is movable, and the dust-absorbing cover part 12 is fixed to the dust-absorbing cover part support part tip part 13B. For this reason, the dust-absorbing cover 12 can be moved in the front-rear direction with respect to the drilling machine main body 20, and the dust-absorbing cover 12 surrounds the drill cutting edge 11 in a state where the drill cutting edge 11 is submerged in the drilled object at the time of drilling. It is possible to seal between the object to be drilled. Thereby, the generated dust can be sucked by the dust cover 12.

  The drill edge 11 extending in the front-rear direction (one direction) is fixed to the tip tool holding portion 15 at the rear end (one end) side. The rotating shaft of the motor is rotatably supported by the main body side rotating shaft support 24 on the drilling machine main body 20 side, and is further rotatably supported by the rotating shaft support 16 fixed to the drilling machine main body 20 in front of it. Is done. Since the tip tool holding part 15 is fixed to this rotating shaft, it rotates with respect to the rotating shaft support part 16. The drill cutting edge 11 is detachable from the tip tool holding portion 15.

  Further, water is supplied to the rotary shaft support portion 16 via a water supply valve (not shown) provided on the back side of the paper surface of the rotary shaft support portion 16 in FIG. 1, and this water passes through the tip tool holding portion 15. Are supplied to the drill cutting edge 11 and ejected from the front end (the other end) of the drill cutting edge 11. However, water is ejected from the drill tip 11 only when the front end of the drill tip 11 is locked to the drilled object and a large force is applied to the front end of the drill tip 11. When not added, water does not spout from the drill cutting edge 11. Alternatively, in a state where the drill blade tip 11 is not mounted on the tip tool holding portion 15, water is configured not to leak from the tip tool holding portion 15 to the outside. In this drilling machine 1, the tip tool holding portion 15 and the rotary shaft support portion 16 are combined to form a water injection mechanism (liquid injection mechanism) 30, which is characterized by the structure of the water injection mechanism 30.

  2A shows a state where the drill tip 11 is not attached to the tip tool holding portion 15, and FIG. 2B shows a state where the drill tip 11 is attached to the tip tool holding portion 15, but a large force is applied to the drill tip 11. FIG. 2C shows a state in which the drill tool tip 11 is mounted on the tip tool holding portion 15 and a drilling operation is performed on the drilled object S, so that a large force is applied to the drill tool tip 11 backward. The structure of the rotating shaft support part 16, the tip tool holding part 15, etc. in each of the states where is added is shown. Here, a cross-sectional view in the horizontal direction (perpendicular to the paper surface in FIG. 1) along the center axis X of the drill cutting edge 11 is shown, and the description of the dust-absorbing cover 12 and the like is omitted.

  Here, the tip tool holding portion 15 is supported rotatably around the central axis X by bearings 17A and 17B fixed to the rotation shaft support portion 16. In addition, a water supply valve 18 is provided on the left side (upper side in FIG. 2) of the rotating shaft support 16 and is external to the water supply valve 18 via a water supply hose (not shown) connected to the water supply port 18A. Water (liquid) is supplied from. When the operator operates the valve cock 18B, the water introduced into the water supply valve 18 is a flow path in the rotary shaft support section 16 that is a flow path from the water supply valve 18 side to the central axis X side. 16A.

  The tip tool holding portion 15 is rotatably supported by bearings 17A and 17B and has a shaft portion 151 that is a small-diameter portion serving as a rotation shaft, and a tip portion 152 that is provided in front of the shaft portion 151 and has a larger diameter than the shaft portion 151. It comprises. The shaft portion 151 is formed with a first flow path 151A that is hollow and serves as a flow path of water along the central axis X. The first flow path 151A is provided on the outer side in the radial direction with the central axis X as the center. In addition, the rotary shaft support portion side flow passage 16A communicates with the water introduction passage 151B. For this reason, when a water supply hose is connected to the water supply port 18A and the valve cock 18B is opened, water is supplied into the first flow path 151A.

  Moreover, in the drill blade edge | tip 11, 2nd flow path 11A is provided so that this may be penetrated along the central axis X. As shown in FIG. For this reason, if the first flow path 151A and the second flow path 11A communicate with each other in a state in which the drill cutting edge 11 is mounted on the tip tool holding portion 15, water is ejected from the front end of the drill cutting edge 11. If the space between the flow path 151A and the second flow path 11A is sealed, water will not be ejected from the drill cutting edge 11. A valve piece 153 for controlling the sealing state between the first flow path 151A and the second flow path 11A is provided in the vicinity of the connecting portion between the shaft portion 151 and the tip portion 152 in the tip tool holding portion 15. It is done. The valve piece 153 is movable along the front-rear direction inside the tip tool holding portion 15, and the sealed state between the first flow path 151 </ b> A and the second flow path 11 </ b> A depends on the position in the front-rear direction. Be controlled.

  For this reason, the rotating shaft support 16 and the tip tool holding portion 15 supply water to the drill tip 11 while rotating the drill tip 11 attached to the tip tool holding portion 15 during operation, or supply of water. When unnecessary, it functions as a water injection mechanism 30 that shuts off the supply of water.

  3 to 5 are enlarged views showing the configuration of the valve piece 153 and parts related thereto in FIGS. 2 (a) to 2 (c), respectively. From the shaft portion 151 to the tip portion 152, the tip tool holding portion 15 has a cylindrical structure, and has an inner surface of the valve piece chamber 152A that is a hollow portion along the central axis X having a diameter larger than that of the first flow path 151A. The valve piece 153 slides in the front-rear direction. Since the valve piece chamber 152A is always in communication with the first flow path 151A, when water is supplied to the first flow path 151A, the water is guided to the valve piece chamber 152A. A spring 154 is installed on the left side of the valve piece 153 in the valve piece chamber 152A, and the rear end (the left end in FIGS. 3 to 5) of the spring 154 is the first flow path 151A on the rear end side of the valve piece chamber 152A. The front end of the spring 154 (the right end in FIGS. 3 to 5) is locked to the rear end surface of the valve piece 153. For this reason, the valve piece 153 is biased forward (rightward in FIGS. 3 to 5) by the elastic force of the spring 154.

  On the other hand, a tip tool mounting hole 152B, which is a hole portion having a larger inner diameter than the valve piece chamber 152A and into which the drill cutting edge 11 is inserted from the front, is provided in front of the valve piece chamber 152A in the tip portion 152. And continuously formed. In addition, a plurality of guide grooves 11B (one each in the vertical direction in FIG. 3) are formed on the outer periphery of the drill cutting edge 11 as shallow grooves formed in the front-rear direction, as shown in FIGS. On the tip 152 side, a metal ball 155 that is slidable and mounted so as not to drop inward engages with the guide groove 11B when the drill blade 11 is mounted. Thereby, the rotation around the central axis X with respect to the distal end portion 152 of the drill blade tip 11 is suppressed during mounting.

  Since the guide groove 11B has a certain length in the front-rear direction, the drill blade 11 can be moved along the front-rear direction. In the state of FIG. 4, the ball 155 is located at the rear end portion of the guide groove 11 </ b> B, and the rear end portion of the drill blade edge 11 is in contact with the front end portion of the valve piece 153. However, in this state, the position of the valve piece 153 in the front-rear direction is not significantly different from the state of FIG. 3 in which the drill blade tip 11 is not mounted. In the state of FIG. 5, the drill cutting edge 11 and the valve piece 153 are moved backward against the elastic force of the spring 154 from the state of FIG. 4, and the ball 155 is moved forward in the guide groove 11B. In the state of FIGS. 4 and 5, since the rotation of the drill blade tip 11 around the central axis X with respect to the tip portion 152 is suppressed, the drill blade tip 11 can be driven to rotate by the tip tool holding portion 15. Further, by applying a large force toward the rear with respect to the drill cutting edge 11, the state shown in FIG. 4 can be changed to the state shown in FIG. 5, and the valve piece 153 can be greatly moved rearward.

  A cylindrical cover 156 that covers the distal end portion 152 from the outside and is movable in the front-rear direction with respect to the distal end portion 152 is attached to the front end side of the distal end portion 152. Since the cover 156 is mounted in a state of being urged rearward with respect to the distal end portion 152 by the spring 156B, the cover 156 is prevented from dropping from the distal end portion 152. Further, the inner surface of the cover 156 is provided with a step portion 156A whose inner diameter increases on the rear side. Corresponding to the stepped portion 156A, a stepped portion 152C is provided on the outer surface of the tip portion 152 so that the outer diameter increases on the rear side of the ball 155. Therefore, when a large force is not applied to the cover 156, the cover 156 is fixed in a state where the step 156A is engaged with the step 152C at the rear. At this time, since the ball 155 is locked by the inner surface of the cover 156 on the outer side, the ball 155 protrudes toward the inner side. For this reason, the position of the drill blade tip 11 with respect to the tip portion 152 is limited to a range in which the ball 155 can be accommodated in the guide groove 11B. In FIG. 4, when the ball 155 is locked on the rear end side of the guide groove 11B, that is, the state where the drill cutting edge 11 is in the foremost position with the ball 155 accommodated in the guide groove 11B is shown. FIG. 5 shows a state where the drill cutting edge 11 has moved rearward. The state in which the ball 155 is locked to the front end of the guide groove 11B is the state in which the drill cutting edge 11 is at the rearmost position.

  By applying a large force to the cover 156 against the elastic force of the spring 156B, the cover 156 can be moved forward. In this case, a portion of the cover 156 having a larger inner diameter behind the step portion 156A moves to a place where the ball 155 is located. Further, the front end side and the rear end side of the guide groove 11B are shaped so that the groove gradually becomes shallower, and when this portion moves to a place where the ball 155 is located, the ball 155 moves outward from the center axis X. The guide groove 11B can be moved forward from the ball 155 by being pushed out. For this reason, the drill cutting edge 11 can be pulled forward from the tip tool mounting hole 152B. Similarly, the operation of mounting the drill cutting edge 11 on the tip tool holding portion 15 can be performed by moving the cover 156 forward. In this manner, the drill cutting edge 11 can be easily attached to and detached from the tip tool holding portion 15.

  In the state shown in FIG. 3 and the state shown in FIG. 4, the valve piece 153 is positioned forward by the elastic force of the spring 154. On the other hand, as shown in FIG. 5, when drilling is performed and a large force is applied to the drill blade tip 11 in the rearward direction, the rear end surface of the drill blade tip 11 comes into contact with the front end surface of the valve piece 153. 153 is moved backward. In this way, the position of the valve piece 153 in the front-rear direction is controlled by the drill cutting edge 11.

  As shown in FIG. 3, a first O-ring mounting groove, which is a groove dug down radially outward along the circumferential direction around the central axis X, is formed on the inner surface of the distal end portion 152 constituting the valve piece chamber 152A. 152D is formed, and an O-ring (first O-ring 157: first sealing member) made of an elastic body is mounted in the first O-ring mounting groove 152D. With this configuration, the movement of the first O-ring 157 in the front-rear direction with respect to the distal end portion 152 is limited. The valve piece 153 is located behind the first O-ring 157.

  On the other hand, on the outer surface of the valve piece 153, a second O-ring mounting groove 153A that is a groove dug inward in the radial direction along the circumferential direction around the central axis X is formed, and the second O-ring mounting groove 153A is formed in the second O-ring mounting groove 153A. Also, an O-ring (second O-ring 158: second sealing member) made of an elastic body is attached. With this configuration, the second O-ring 158 is fixed to the valve piece 153 in the front-rear direction. Since the valve piece 153 is located behind the first O-ring 157, the second O-ring 158 is located behind the first O-ring 157.

  4 and 5 show a state in which the rear end portion of the drill blade tip 11 and the front end portion of the valve piece 153 are in contact with each other. Here, the front surface of the valve piece 153 is not flat, and even when the rear end portion of the drill blade tip 11 and the front end portion of the valve piece 153 are in contact with each other, the outer periphery around the central axis X of the valve piece 153 is changed to the central axis. A communication groove 153 </ b> B through which water can flow toward the X side is formed on the front surface of the valve piece 153. For this reason, even when the rear end portion of the drill blade tip 11 and the front end portion of the valve piece 153 are in contact with each other, if water is introduced into the region ahead of the second O-ring 158 in the valve piece chamber 152A, this water Flows into the second flow path 11A via the communication groove 153B. For this reason, the second O-ring 158 is used to block between the valve piece chamber 152A (first flow path 151A) and the second flow path 11A.

  Note that a third O-ring mounting groove 152E similar to the first O-ring mounting groove 152D is formed in front of the ball 155 at the tip portion 152, and the O-ring made of an elastic body is formed in the third O-ring mounting groove 152E. A ring (third O-ring 159) is attached. For this reason, the drill cutting edge 11 is fixed to the tip portion 152 via the first O-ring 157 and the third O-ring 159. However, as described above, in this state, the drill cutting edge 11 can be moved with respect to the distal end portion 152 by a length corresponding to the width in the front-rear direction of the guide groove 11B.

  Hereinafter, the flow of water during the movement of the valve piece 153 will be described. First, as shown in FIG. 3, the tip tool mounting hole 152B is hollow when the drill blade 11 is not mounted. In this case, the front surface of the valve piece 153 urged forward by the spring 154 is locked by the first O-ring 157 in the vicinity of the outer periphery thereof. For this reason, the valve piece 153 cannot move forward from the state of FIG. That is, the valve piece chamber 152A and the tip tool mounting hole 152B are formed continuously, but the first O-ring 157 prevents the valve piece 153 from coming off from the valve piece chamber 152A when the drill blade tip 11 is not mounted. Play a role.

  At this time, the second O-ring 158 is in contact with the inner surface constituting the valve piece chamber 152A to seal between the valve piece 153 and the inner surface. Therefore, the space between the first flow path 151A and the outside air in the tip tool mounting hole 152B is sealed, and water does not leak at least from the first flow path 151A to the front end side of the tip tool holding portion 15, and the tip tool Water does not leak into the mounting hole 152B.

  In this case, a concave portion 152F dug down radially outward along the circumferential direction around the central axis X is formed on the inner surface of the valve piece chamber 152A behind the location where the second O-ring 158 is located. ing. The recess 152F has a cross-sectional shape along the front-rear direction that is deepest at the center in the front-rear direction and shallower toward both sides in the front-rear direction. The first O-ring mounting groove 152D, the second O-ring mounting groove 153A, and the third O-ring mounting groove 152E are shown in FIGS. 3 to 5 in order to limit the movement of each mounted O-ring in the front-rear direction. The cross section has a steep shape. On the other hand, the cross-sectional shape of the recess 152F is such that its depth gradually changes in the front-rear direction so that the second O-ring 158 can easily move in the front-rear direction along the recess 152F. Yes. In particular, the concave portion 152F gradually deepens toward the rear in front of the deepest central portion so that the second O-ring 158 can easily move from the front side of the concave portion 152F to the deepest central portion. It has a shape. Since the recess 152F is a part of the valve piece chamber 152A, in the state shown in FIG. 3, water enters the recess 152F, but this water is located in front of the recess 152F. The second O-ring 158 is sealed.

  On the other hand, in the state of FIG. 4 where the drill blade tip 11 is mounted, when the rear end portion of the drill blade tip 11 comes into contact with the front end portion of the valve piece 153, the first O-ring 157 also comes into contact. In this state, since the rear end portion of the drill blade tip 11 is locked to the front end portion of the valve piece 153 biased toward the front, the drill blade tip 11 is moved backward unless a large force is applied to the drill blade tip 11. It cannot be moved. Further, since the ball 155 is locked to the rear end of the guide groove 11B, the drill cutting edge 11 cannot be moved forward. For this reason, the positional relationship with respect to the front-end | tip part 152 (tip tool holding | maintenance part 15) of the drill blade edge 11 is fixed in the state of FIG. 4, and the drill blade edge 11 can be rotationally driven.

  At this time, as described above, in the state shown in FIG. 4, the position of the valve piece 153 in the front-rear direction is not different from the state shown in FIG. Therefore, the state in which the second O-ring 158 seals between the inner surface of the valve piece chamber 152A and the valve piece 153 is maintained in the state of FIG. 4, and water is supplied in front of the second O-ring 158. The water is not supplied to the second flow path 11A. For this reason, water is not ejected from the front end of the drill blade edge 11.

  In the state of FIG. 5 in which the drill blade tip 11 and the valve piece 153 have moved greatly rearward, the second O-ring 158 moves rearward and is positioned in the recess 152F. Here, the recess 152F is formed so as to be deep at the center in the front-rear direction. When the second O-ring 158 moves to this deep portion, the bottom surface of the recess 152F and the second O-ring 158 do not come into contact with each other. For this reason, in the valve piece chamber 152 </ b> A, the regions before and after the second O-ring 158 communicate with each other, and water flows forward from the second O-ring 158. As described above, this water flows to the second flow path 11A via the communication groove 153B. As a result, the valve piece chamber 152A (first flow path 151A) and the second flow path 11A communicate with each other, and water is ejected from the front end of the drill cutting edge 11.

  On the other hand, in the state of FIG. 5, the first O-ring 157 and the third O-ring 159 are sealed between the outer peripheral surface of the drill cutting edge 11 and the inner surface of the tip portion 152. For this reason, it is suppressed that water leaks from the clearance gap between the outer peripheral surface of the drill blade edge | tip 11, and the inner surface of the front-end | tip part 152, and water ejects only from the front end of the drill blade edge | tip 11. FIG. If drilling is performed without jetting water, the valve cock 16B may be operated to stop water supply to the tip tool holding unit 15 side.

  For this reason, in said drilling machine 1, the removal | desorption operation | work of the drill blade tip 11 which can inject water from the front-end | tip is easily performed. At this time, when the drill blade 11 is not mounted, water does not leak to the outside. When the drill blade 11 is mounted, the water flow is prevented so that water is not ejected when the drilling operation is not performed. Is automatically controlled. At this time, leakage of water from other than the tip of the drill cutting edge 11 is also suppressed.

  Such an operation is performed using the valve piece 153. At this time, the first O-ring 157 plays a role of preventing the valve piece 153 from being detached when the drill blade edge 11 is not mounted, and when the drill blade edge 11 is mounted, water is not at the tip of the drill blade edge 11. And the drill cutting edge 11 is supported. Further, the second O-ring 158 prevents water from leaking when the drill blade tip 11 is not mounted, and prevents water from being ejected from the tip of the drill blade tip 11 when the drill blade tip 11 is mounted and no drilling operation is performed. To do.

  At this time, as described above, the control of the water flow as described above is performed only by detachment of the drill blade tip 11 or movement in the front-rear direction after mounting. Such control is realized by a simple structure using the valve piece 153, the first O-ring 157, the second O-ring 158, and the like. For this reason, in this water injection mechanism 30 or the punching machine 1, it is hard to produce a failure, and these can be made cheap.

  In the above-described configuration, the communication groove 153B is provided on the valve piece 153 side. However, water can flow through the second flow path in a state where the front surface of the valve piece and the rear end portion of the drill blade tip are in contact with each other. As far as possible, the structure of this part is arbitrary. For example, the communication groove may be provided on the drill blade tip side. In addition, the shape of the concave portion that becomes the water flow path before and after the second O-ring (second sealing member) is arbitrary as long as the same water flow as described above can be realized when the second O-ring moves in the front-rear direction. It is.

  In the above description, the O-rings (the first O-ring (first sealing member) 157 and the second O-ring (second O-ring) 158) made of an elastic body are used. As long as the locking and water sealing are possible, other than the O-ring can be used as the first sealing member and the second sealing member.

  In the above configuration, the water injection mechanism 30 is configured by combining the tip tool holding portion 15 and the rotary shaft support portion 16 in order to rotate the drill blade 11 and perform water injection and control the water injection. Such a water injection mechanism 30 can also be used to perform water injection to the tip tool in a working machine using the tip tool that is also rotationally driven, in addition to the drilling machine 1 described above. It is also clear that the present invention can be applied to liquids other than water.

1 Drilling machine
11 Drill edge (tip tool)
11A 2nd flow path 11B Guide groove 12 Dust absorption cover part 13 Dust absorption cover part support part 13A Dust collection cover part support part base part 13B Dust collection cover part support part tip part 14 Dust collection hose 15 Tip tool holding part 16 Rotating shaft support part 16A Rotating shaft support part Part side flow paths 17A, 17B Bearing 18 Water supply valve 18A Water supply port 18B Valve cock 20 Punch machine main body 21 Handle 22 Battery 23 Trigger 24 Main body side rotating shaft support part 30 Water injection mechanism (liquid injection mechanism)
151 Shaft portion 151A First flow passage 151B Water introduction passage 152 Tip portion 152A Valve piece chamber 152B Tip tool attachment hole 152C, 156A Step portion 152D First O-ring attachment groove 152E Third O-ring attachment groove 152F Recess 153 Valve piece 153A Second O-ring Mounting groove 153B Communication groove 154, 156B Spring 155 Ball 156 Cover 157 O-ring (first O-ring: first sealing member)
158 O-ring (second O-ring: second sealing member)
159 O-ring (3rd O-ring)
X Center axis S Drilled object

Claims (9)

A tip tool extending along one direction is provided with a cylindrical tip tool holding portion to be inserted and attached to one end side in the one direction, and the tip tool is driven via the tip tool holding portion. A liquid injection mechanism for supplying liquid to the tip tool,
A first flow path provided on the tip tool holding part side through which the liquid flows and a second flow path provided inside the tip tool can be communicated with each other.
The tip tool holder is
It is movable along the one direction, and when the tip tool is mounted on the tip tool holding portion, when positioned on the other end side, between the first channel and the second channel. The liquid is prevented from flowing into the second flow path by sealing, and the seal between the first flow path and the second flow path is released when positioned on the one end side. A valve piece that allows the liquid to flow from the first channel to the second channel;
When the tip tool is not attached to the tip tool holding portion, the valve piece is locked on the other end side, and when the tip tool is attached to the tip tool holding portion, the outer periphery of the tip tool and the tip A first sealing member that seals between the inner surface of the tool holder and suppresses the outflow of the liquid to the outer periphery of the tip tool;
A liquid injection mechanism comprising:   The note according to claim 1, wherein the valve piece is configured to move toward the one end side by being urged toward the other end side and pushed toward the one end side by the tip tool. Liquid mechanism. The tip tool holder is
In the one direction, on the one end side than the first sealing member,
The liquid injection mechanism according to claim 1, further comprising a second sealing member that is provided in the valve piece and seals between the first flow path and the second flow path.   The liquid injection mechanism according to claim 3, wherein the valve piece is slidable along an inner surface of the tip tool holding portion.   The liquid injection mechanism according to claim 4, wherein the first sealing member is an O-ring attached to the inner surface.   The liquid injection mechanism according to claim 4 or 5, wherein the second sealing member is an O-ring attached to an outer surface of the valve piece. The inner surface is provided with a recess along a circumferential direction around the one direction,
When the valve piece is located on the other end side, the second sealing member is located at a location that does not overlap the recess in the one direction and seals between the inner surface and the valve piece. ,
When the valve piece is positioned on the one end side, the second sealing member is positioned at a location overlapping the recess in the one direction, and the second sealing member and the bottom surface of the recess The liquid injection mechanism according to any one of claims 4 to 6, wherein a gap is formed therebetween.   The liquid injection mechanism according to claim 7, wherein the concave portion has a configuration in which a depth perpendicular to the one direction increases toward the one end side.   A drilling machine using the liquid injection mechanism according to any one of claims 1 to 8 and the tip tool for drilling at the other end.

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