JP2002166414A - Wet drill device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively prevent a gelatinous discharged material from drooling down the outer peripheral part of a drill shaft to the drill body side when an operation to perforate a ceiling surface and the like is performed. SOLUTION: This wet drill device comprises a bracket member 22 supported by a drill body 3, a cover member 23 which has a drill head guide hole 23d formed to allow passage of a drill shaft 15 through to make a bit 16 penetrate an internal space 23c and which discharges a mixture of dust or the like and liquid from the internal space 23c to the outer peripheral part, an attachment member 24 which is tightly attached to a perforated face 2 to hermetically seal the periphery of a perforated part, and a sealing member 21 which is formed of an elastic material and has a shaft guide hole 26a of a smaller diameter than the outside diameter of the drill shaft 15, the shaft guide hole 26a being set concentrically with a drill head guide hole 23d and assembled into the cover member 23 in a freely attachable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet drilling apparatus for piercing while supplying liquid from the tip of a bit, and more particularly, to preventing dripping of a mixed discharge of dust and liquid generated during the piercing operation. The present invention relates to a wet drill device having a mechanism.

[0002]

2. Description of the Related Art A drill device is used for, for example, drilling a hole for filling a repair agent, a pilot hole for driving an anchor, and the like in a repair work of a concrete building. Generally, a vibration drill and a rotary drill are used for the drill device.
The vibration drill can perform a simple drilling operation without the need for cooling water or the like, but has a problem that the noise is loud and the crack is expanded by the vibration. In a rotary drill, a bit is attached to the tip of a drill shaft, and cooling water, compressed air, or the like is supplied to a drilled portion to perform drilling while cooling the bit and removing dust. The rotary drill enables the drilling operation without the problem of the vibration drill described above, but requires a water supply facility, a compressor, etc., and the processing of the gel-like discharge generated by the drilling operation is troublesome. There was a problem that there was.

[0003] The applicant has provided a novel wet drilling device disclosed in Japanese Patent Application Laid-Open No. 10-612 or the like which solves the problems of the conventional drilling device described above. The new wet drilling machine liquefies a coolant consisting of a base liquid mixed with a low boiling point organic solvent in an aerosol can, guides the coolant to the tip of the bit, and sprays it into the drilling hole. Drilling is performed while performing. The new wet drilling equipment eliminates the need for water supply equipment and compressors, is compact and lightweight, is easy to handle, and greatly shortens the drying time for drilling locations and the setup time for the next process, greatly improving work efficiency. It has gained a very good reputation due to its advantages such as conversion.

[0004] The applicant has actively taken in opinions and proposals from the field and the like and worked to improve them.
By providing a cover member at the tip end as disclosed in Japanese Patent No. 8435, a gel or colloidal discharge generated by mixing a coolant and dust with a drilling operation, although not as much as in a conventional rotary drill, is provided. Also provided is a wet-type drilling device for handling objects (hereinafter collectively referred to as gel-like discharge). The improved wet drilling device includes an attachment member that seals a portion of the drilling surface that surrounds the bit, a cover member that has a waste collection space that stores the gel-like discharge flowing out of the drilling portion, and a cover member that discharges from the cover member. And a collection container for collecting the discharged gel. According to the improved wet drill device, it is possible to continuously perform the drilling operation on a vertical wall surface or the like without the need for a pretreatment such as a curing process corresponding to the scattering of the gel-like discharge.

[0005]

In the above-mentioned wet drilling apparatus, a large number of holes are continuously drilled while being held vertically or obliquely upward, for example, when drilling a ceiling surface. In this case, a state occurs in which a part of the gel-like discharge generated from the perforated portion flows down along the outer peripheral portion of the drill shaft via the bit. In a wet drilling device, a small amount of this gel-like discharge is generated from the gap between the outer peripheral portion of the drill shaft and a drill head guide hole through which a drill shaft formed in a cover member penetrates into a discharge recovery space. In some cases, liquid dripping down to the surface occurred.

In the wet drilling device, when the gel-like discharge material enters the inside of the drill main body along the drill shaft, insulation failure occurs in an electric part such as a motor, and the gel adheres to a rotating shaft and hardens. As a result, poor rotation may occur. In addition, in the wet drill device, there is a problem that the gel-like discharge may fall on a face or the like of an operator who works while looking up at a perforated portion. Furthermore, in the wet drilling apparatus, there is a problem that the gel-like discharge falls on the floor or the like and soils the surroundings, requiring a post-process such as a cleaning operation.

In a wet drilling device, for example, after one or several holes are drilled, the gel-like discharge adhering to the outer peripheral portion of the drill shaft is moved slightly downward and moved to the tip side to remove the discharge from the cover member. It is also possible to shake off into the collection space. However, there is a problem that such a measure deteriorates the workability and leaves it to the operator, so that it is difficult to reliably prevent the above-mentioned problem from occurring.

Accordingly, the present invention provides a wet drilling apparatus for reliably preventing a gel-like discharge from flowing along an outer peripheral portion of a drill shaft and dripping toward a drill body during drilling work on a ceiling surface or the like. It has been proposed for the purpose.

[0009]

According to the present invention, there is provided a wet drill apparatus which achieves the above-mentioned object, and which is movable in parallel with a drilling direction with respect to a drill body and supported by being urged toward a drilling surface. A member, a drill shaft is passed through a drill head guide hole provided on a bottom surface attached to a bracket member, and a bit is made to face a waste collection space portion. A cover member that discharges the mixed waste from the waste collection space, an attachment member that is attached to the opening of the cover member and surrounds the periphery of the bit during the drilling operation and is in close contact with the drilling surface, and an outer diameter of the drill shaft. A small-diameter shaft guide hole is provided. This shaft guide hole is positioned coaxially with the drill head guide hole and is detachably assembled to the cover member. Constructed and a sealing member formed of an elastic material to be kicked.

[0010] According to the wet drilling apparatus of the present invention configured as described above, the drill shaft is inserted into the shaft guide hole of the sealing member and faces the waste collection space of the cover member. According to the wet drill device, the outer circumference of the drill shaft is sealed by making the inner diameter of the shaft guide hole smaller than the outer diameter of the drill shaft. According to the wet drill device, by drilling a wall or a ceiling surface while supplying the liquid from the tip of the bit, the bit is cooled by heat of vaporization of the liquid, and the drilling powder is discharged from the inside of the drilling hole. An efficient drilling operation is performed. According to the wet drill device, the gel-like discharge formed by mixing the liquid and the drilling powder flows into the discharge recovery space of the cover member without scattering to the outside, and from the discharge portion provided in the cover member. Is discharged.

According to the wet drilling apparatus, when used in a vertical state or an obliquely upward state, for example, for drilling a ceiling surface, a part of the gel-like discharge flows down along the outer peripheral portion of the drill shaft. According to the wet drilling device, as described above, the outer peripheral portion of the drill shaft is protruded into the waste collection space portion of the cover member in a state where the outer peripheral portion is sealed by the sealing member, so that the gel-like material that flows down the outer peripheral portion of the drill shaft. Prevents discharge from flowing down to the drill body side. Therefore, according to the wet drilling device, poor insulation or poor rotation caused by the intrusion of the gel-like discharge into the inside of the drill body, falling on the face or the like of an operator who looks up at the drilled portion or stains the surroundings. The occurrence of inconveniences, such as inconvenience, is prevented. According to the wet drilling device, when the sealing member is worn out due to use, it is replaced by a simple operation, so that a sufficient sealing action of the drill shaft is maintained. According to the wet drilling device, the replacement of the sealing member is performed by removing the cover member from the drill body, removing the worn sealing member from the cover member, and installing a new sealing member.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. Wet drill device 1
Makes it possible to continuously drill a large number of perforations on a ceiling surface or a wall surface (hereinafter referred to as a perforated surface 2), for example. As shown in FIG. And an attachment unit 4 attached to the unit 3. Although not described in detail, the drill body 3 includes a drive motor, a rotating shaft, a bearing mechanism, a chucking mechanism, and the like inside a housing. The drill body 3 is integrally provided with a hand-held part 5 on the base end side, and the hand-held part 5 is provided with a power cord lead-out part 6, a trigger lever 7, a main switch 8, and the like.

The drill body 3 is constructed in substantially the same manner as a conventional drill device. The power cord drawn from the power cord drawer 6 is connected to a commercial power source, the main switch 8 is turned on, and the trigger lever 7 is operated. By doing so, power is supplied to the drive motor. The drill body 3
Although not shown, a chucking mechanism is attached to the tip of a rotating shaft that is rotationally driven by a drive motor, and the chucking mechanism rotationally drives a drill head 9 of an attachment unit 4 to be described later, which is attached and detached.

The attachment section 4 includes a drill head 9
, A cylindrical housing 10, a drill guide mechanism 11, a waste scattering prevention mechanism 12, a waste collection container 13, and the like. The drill head 9 is appropriately exchanged according to the diameter of the hole to be drilled. Although not described in detail, the axis of the rotary shaft 14 is aligned with the other end of the rotary shaft 14 whose base end is attached and detached by the chucking mechanism. It is composed of a long-axis drill shaft 15 attached and a member such as a bit 16 attached to the tip of the drill shaft 15. Although not shown, the drill head 9 forms a coolant passage communicating with the rotating shaft 14, the drill shaft 15 and the bit 16. In addition, the attachment part 4 may attach the drill head 9 not only to the chucking mechanism but also to the drill body 3 by a reverse screw structure.

The cylindrical casing 10 is assembled to the drill main body 3 so as to cover the chucking mechanism of the drill main body 3, though details are omitted. The cylindrical housing 10 is provided with a coolant supply unit 18 that supplies a coolant to a coolant channel of the grip 17 and the rotating shaft 14, and a guide support bracket member 19 of the drill guide mechanism 11 is provided. . Although not shown, a bearing mechanism that supports the rotating shaft 14 and an oil seal mechanism or a bit 16 that holds the bearing mechanism in a liquid-tight manner are pressed against the perforated surface 2 inside the cylindrical housing 10, though not shown. An automatic valve mechanism or the like for opening and supplying a coolant to the drill head 9 is provided.

Although not described in detail, the rotary shaft 14 is formed with an axial coolant flow path whose base end is closed, and an inflow port opened between the oil seal mechanisms in the coolant flow path. Coolant flows in from. A drill shaft 15 is connected to the end of the rotating shaft 14, and a rectifying nozzle is provided at this connection site. The drill shaft 15 is a long-axis cylindrical member provided with a coolant passage penetrating therein, and a bit 16 is formed by an outer peripheral reverse screw formed at a tip end thereof.
Is attached freely. The bit 16 is formed, for example, of a sintered alloy in which diamond grains are mixed into a cylindrical shape, and has an inner peripheral reverse screw forming an attachment portion at one end and an axial slit formed at the other end side. I have. Bit 1
6 pierces the perforation surface 2 while jetting the coolant supplied from the coolant channel from the opening at the tip. Bit 16 contains
A slit is provided, and the gel-like discharge generated in the perforation is efficiently discharged to the outside through the slit.

The coolant supply section 18 is disposed between a pair of oil seal mechanisms, and is provided with a stem, a filter mechanism, and the like. A hose (not shown) is connected to the coolant supply unit 18, and coolant is supplied from an aerosol can. The coolant is supplied to the coolant flow path such as the rotating shaft 14 via the coolant supply unit 18 when the automatic valve mechanism is opened by performing the perforation operation, and is injected from the bit 16 into the perforation.
The coolant discharges the gel-like discharge from inside the perforation by the injection pressure, and the heat generated by the vaporization of the organic solvent.
To cool efficiently.

The coolant is a mixture of water and a low-boiling organic solvent such as methanol, ethanol or various esters and / or a soluble liquefied gas such as dimethyl ether. Enclosed. Sufficient injection pressure is generated by evaporating the low-boiling organic solvent inside the aerosol can, and the coolant is injected and supplied into the coolant channel by opening the automatic valve mechanism. The aerosol can may be supplied with a compressed gas such as a carbon dioxide gas or a nitrogen gas in order to maintain the injection pressure even in a low temperature environment.

The drill guide mechanism 11 functions to regulate the amount of drilling and to support the discharge scattering prevention mechanism 12. The drill guide mechanism 11 is provided with a guide support bracket member 19 attached so as to protrude from the cylindrical housing 10, and is movable in the axial direction parallel to the drill head 9 with respect to the guide support bracket member 19. And a guide shaft member 20 mounted with a restricted amount of movement and a coil spring 21 and the like. The guide shaft member 20 is provided with a bracket member 22 that constitutes the emission scattering prevention mechanism 12 at its distal end. The coil spring 21 is mounted on the guide shaft member 20 to urge the bracket member 22 in the drilling direction.

The drill guide mechanism 11 causes the guide shaft member 20 to move toward the drill body 3 against the elastic force of the coil spring 21 as the drill head 9 enters the borehole by performing a drilling operation described later. And move. When drilling to a predetermined depth is performed, the stopper provided on the guide shaft member 20 of the drill guide mechanism 11 comes into contact with the guide support bracket member 19 to stop the penetration of the drill head 9.
The drill guide mechanism 11 presses the waste scattering prevention mechanism 12 against the drilling surface 2 by the elastic force of the coil spring 21 during the drilling operation. Exhaust scattering prevention mechanism 12
2 and 3, as shown in FIG. 2 and FIG.
, A bracket member 22, and a cover member 23 attached to the perforation surface 2 side of the bracket member 22 with mounting screws (not shown). The discharge scattering prevention mechanism 12 includes an attachment member 24 assembled to the cover member 23, a shaft guide member 25, a sealing member 26, packing members 27 and 28, and the discharge pipe member 2.
9 and the like. The emission scattering prevention mechanism 12
Prevents splattering of gel-like effluent during drilling.

The bracket member 22 has one end fixed to the tip of the guide shaft member 20 as described above. The bracket member 22 is provided with a drill guide hole 22a that penetrates the drill shaft 15 at a substantially central portion, and the cover member 23 is attached so that the drill guide hole 22a is aligned with the axis. The waste collection container 13 is attached to the bracket member 22 at the free end side bent toward the perforation side.

The cover member 23 is formed of a hard synthetic resin or the like, and has a generally cup-like shape having a discharge accommodating space portion 23c having an outer peripheral portion 23a and a bottom portion 23b and an opening on the perforation surface 2 side. Although the details of the cover member 23 are omitted, the outer peripheral portion 2 thereof corresponds to the line of sight of the operator.
Part of 3a is cut horizontally. Cover member 23
Although not shown, a pair of mounting holes are formed in the bottom surface 23b, and the bottom surface 23b is fixed to the bracket member 22 with the bottom surface 23b as a mounting surface. The cover member 23 has a drill shaft 1 on a bottom surface 23b as shown in FIG.
A drill head guide hole 23d for projecting the protrusion 5 into the discharge storage space 23c is provided therethrough. The drill head guide hole 23 d has a hole diameter of the drill shaft 15.
Is formed to have a larger diameter than the outside diameter.

The cover member 23 has a fitting recess 23e formed on the outer surface of the bottom surface 23b so as to sit around the opening of the drill head guide hole 23d. In the cover member 23, a packing groove 23f in which the annular packing member 27 is assembled is formed at the bottom of the fitting recess 23e. A packing member 27 formed of an elastic material in a ring shape is fitted into the cover member 23 in the packing groove 23f. In the cover member 23, a sealing member 26, which will be described in detail later, is fitted into the fitting recess 23 and assembled. The shaft guide member 25 is fitted into the fitting recess 23 with the sealing member 26 fitted in the cover member 23.

The thickness of the shaft guide member 25 is greater than the depth of the fitting recess 23e of the cover member 23.
A shaft guide hole 25 a having a larger diameter than the outer diameter of the drill shaft 15 is provided. Shaft guide member 25
As described later, the run-out of the drill shaft 15 is suppressed by penetrating the drill shaft 15 through the shaft guide hole 25a. The packing member 27 is formed of an elastic material so that its thickness is larger than the depth of the packing groove 23f.

The sealing member 26 is made of an elastic material having wear resistance and chemical resistance, for example, natural rubber, butadiene acrylonitrile rubber (NBR), butadiene rubber (B
R), synthetic rubber such as butadiene styrene rubber (SBR) or a soft synthetic resin. The sealing member 26 has an outer diameter equal to the inner diameter of the fitting recess 23e of the cover member 23, and is formed in a thin ring shape as a whole by providing the shaft guide hole 26a. In the sealing member 26, the shaft guide hole 26 a has an inner diameter smaller than the outer diameter of the drill shaft 15. The drill shaft 15 is inserted into the sealing member 26 in the shaft guide hole 26a as described later.

In the cover member 23, the packing member 27 is fitted in the packing groove 23f, and the fitting recess 2 is formed.
The sealing member 26 and the shaft guide member 25 are fitted in this order in 3e to form an assembly. The assembly is
The packing member 27 is in a state where its outer surface protrudes from the opening edge of the packing groove 23f and is in close contact with the inner surface of the sealing member 26. The assembly includes a shaft guide member 25.
Is fitted in the fitting recess 23e of the cover member, and its outer surface protrudes from the outer surface of the bottom portion 23b of the cover member.

In the cover member 23, a discharge pipe connecting portion 23h is formed integrally with the outer peripheral portion 23a so as to protrude. The discharge pipe connecting portion 23h is formed with a discharge hole 23i that penetrates the outer peripheral portion 23a and communicates with the discharge storage space 23c.
The discharge hole 23i is configured as an inclined hole that is gradually inclined toward the base end side with respect to the axis of the drill head 9. A packing member 28 is attached to the cover member 23 by spotting the opening of the discharge hole 23i. Cover member 2
3, a discharge pipe member 29 described later is attached to the discharge pipe connection part 23h so that one end of the discharge pipe 23i is screwed or the like so that the discharge pipe 23i has the same axis as the discharge hole 23i.

The assembly includes a bottom portion 23b of the cover member 23.
Is screwed to the bracket member 22. In the assembly, the shaft guide member 25 is pushed into the fitting recess 23e by tightening a mounting screw (not shown). The assembly is configured such that the sealing member 26 is pressed against the packing member 27 via the shaft guide member 25,
The space between the fitting recess 23 e of the cover member 23 and the shaft guide member 25 is sealed.

The assembly includes a cover member 23 as described later.
Is attached to the bracket member 22, and the drill shaft 15 of the drill head 9 faces the discharge storage space 23 c of the cover member 23. Specifically, the assembly penetrates the drill shaft 15 through the shaft guide hole 25a of the shaft guide member 25, the shaft guide hole 26a of the sealing member 26, and the drill head guide hole 23d of the cover member 23, inside the discharge storage space 23c. Face.

As described above, the shaft guide hole 26a of the sealing member 26 has an inner diameter slightly smaller than the outer diameter of the drill shaft 15 as described above. Guide hole 26
This is fitted and inserted in a state in which the diameter of “a” is increased and closely attached to the outer peripheral portion of the drill shaft 15. Therefore, in the assembly, the outer peripheral portion is sealed by inserting the drill shaft 15 into the shaft guide hole 26a of the sealing member 26.

The cover member 23 has an outer peripheral portion 2 on the opening side.
3a, a mounting recess 23g is formed.
The attachment member 24 is detachably attached by fitting the fitting protrusion 24b to the fitting protrusion 24b. The attachment member 24 is made of an elastic material such as rubber or the like.
It is formed in the shape of a whole cylinder having a, and maintains the close contact of the cover member 23 with the perforated surface 2 to prevent scattering of gel-like discharge generated from inside the perforated hole and to suppress generation of noise. The attachment member 24 includes a closed space 24.
a has a base end side portion having a large diameter, and a fitting projection 24b is integrally formed on an inner surface of the large diameter portion. As described above, the attachment member 24 is
By fitting “b” into the mounting recess 23 g, it is mounted on the tip of the cover member 23. Note that the attachment member 24 may be provided with a second attachment member formed in a cylindrical shape with an elastic material such as sponge on the outer peripheral portion.

In the attachment member 24, an inner peripheral attachment portion 24c and an outer peripheral attachment portion 24d are integrally formed at a distal end opening. The inner peripheral attachment portion 24c is formed of a ring-shaped convex portion having a large thickness and a gradually thinner distal end. The inner peripheral attachment portion 24c has rigidity so that the abutting state against the perforation surface 2 is firmly held during the perforation operation, and the perforation position is not shifted by a fluctuation operation or the like. The outer peripheral attachment portion 24d is provided with an inner peripheral attachment portion 24c.
It has a larger diameter than that of the front end, and has a trumpet shape whose diameter gradually increases toward the distal end. The outer peripheral attachment portion 24d can be formed even when the perforated surface 2 has fine irregularities or an inclined surface.
By easily elastically deforming in the diameter-enlarging direction, it acts so as to maintain the close contact with the perforated surface 2.

The connection portion of the discharge pipe member 29 with the discharge pipe portion 23h is sealed by the packing member 28.
The discharge pipe member 29 is inserted into the waste collection container 13 attached to the free end side of the bracket member 22. Although not described in detail, the waste collection container 13 includes a wide-mouthed container main body, and a lid screwed to an opening of the container main body and attached to the bracket member 22.

The waste collection container 13 is attached in such a manner as to be inclined to the base end side with respect to the axis of the drill head 9 as shown in FIG. Gel-like discharge generated by the perforation work flows into the discharge recovery container 13 through the cover member 23 and the discharge pipe member 29. When the boring operation is completed, the waste collection container 13 is processed for the gel-like discharge collected inside the container body with the container body removed from the lid.

The wet drill device 1 is held perpendicular to the drilling surface 2 as shown in FIG.
Is positioned at the piercing point and pressed against the piercing surface 2. In the wet drilling device 1, the attachment member 24 of the emission scattering prevention mechanism 12 surrounds the bit 16 and is in close contact with the drilling surface 2, and the automatic valve mechanism is opened to supply the coolant into the drill head 9. Will be In the wet drill device 1, the drill head 9 is driven to rotate by the operation of the trigger lever 7, and the drilling operation of the drilling surface 2 with the bit 16 is started. The wet drill device 1 is provided with the discharge scattering prevention mechanism 12, thereby preventing the scattering of the gel discharge so as not to pollute the surroundings and to reduce the generation of noise.

In the wet drill device 1, the gel-like discharge generated from the inside of the drilling due to the drilling operation flows into the discharge storage space 23c of the cover member 23 through the closed space 24a of the attachment member 24. To store. The wet drill device 1 converts the gel-like discharge into the discharge storage space 23.
c to the waste collection container 13 through the discharge pipe member 29. As described above, the wet-type drill device 1 attaches the waste collection container 13 at an angle with respect to the axis of the drill head 9 so that the gel-like discharge flows down into the waste collection container 13. .

By the way, in the wet drill device 1,
During the drilling operation, a part of the gel-like discharged material flows down the outer peripheral portion of the drill shaft 15 via the bit 16 and flows down to the base end side. Since the wet drill device 1 has a structure in which the outer peripheral portion of the drill shaft 15 is sealed by the sealing member 26 as described above, dripping of the gel-like discharge from the inside of the cover member 23 is prevented. Therefore, in the wet drill device 1, the gel-like discharge enters the inside of the drill main body 3 to cause insulation failure, or falls on a face or the like of an operator who looks up at a drilled portion and works on the periphery. Prevent the occurrence of inconvenience such as soiling.

In the wet drill device 1, the drill shaft 15 is provided with the shaft guide hole 2 of the sealing member 26.
It rotates while rubbing the inner peripheral wall of 6a. Accordingly, in the wet drill device 1, the sealing member 26 is gradually worn out with use and cannot perform a sufficient sealing action, so that the sealing member 26 is replaced. In the wet drill device 1, the cover member 23 is removed from the bracket member 22 and is pulled out from the tip side of the drill head 9. In the wet drill device 1,
The shaft guide member 25 and the sealing member 26 are removed in this order from the fitting recess 23e of the cover member 23.

In the wet drill device 1, a new sealing member 26 and a new shaft guide member 25 are assembled in this order into the fitting recess 23e of the cover member 23. In the wet drill device 1, the cover member 23 is reassembled from the tip side of the drill head 9, and the cover member 23 is fixed to the bracket member 22. In addition,
In the wet drill device 1, at the time of the above-described replacement operation of the sealing member 26, cleaning of the cover member 23 and the like are appropriately performed.

4 and FIG. 5 is preferably used when the drill head 9 having a relatively small diameter is mounted on the drill body 3. As shown in FIG. The waste scattering prevention mechanism 30 uses the waste collection container 13 and the bracket member 22 in common, and includes a cover member 31, an attachment member 32, a discharge guide member 33, and a sealing member 34. The cover member 31 is formed of a synthetic resin or the like in the same basic shape as the cover member 23 described above, and has an outer peripheral portion 31a and a bottom surface portion 31b.
It has a generally cup-like shape having a discharge storage space 31c with an open side.

A part of the outer peripheral portion 31a of the cover member 31 is also cut horizontally so as to correspond to the line of sight of the worker. Although not shown, the cover member 31 has a pair of mounting holes formed in a bottom surface portion 31b, and is fixed to the bracket member 22 with the bottom surface portion 31b as a mounting surface.
As shown in FIG. 4, the cover member 31 is provided with a drill head guide hole 31d for projecting the drill shaft 15 into the waste storage space 31c through the bottom surface 31b. The diameter of the drill head guide hole 31 d is formed to be larger than the outer diameter of the drill shaft 15.

In the cover member 31, a discharge pipe connecting portion 31e is formed integrally with the outer peripheral portion 31a so as to protrude. The discharge pipe connecting portion 31e is formed with a discharge hole 31f penetrating the outer peripheral portion 31a and communicating with the discharge storage space 31c.
The discharge hole 31f is configured as an inclined hole that is gradually inclined toward the base end side with respect to the axis of the drill head 9. Although not shown, a packing member is attached to the cover member 31 so as to face the opening of the discharge hole 31f. By screwing one end of the cover member 31 into the discharge hole 31f, the discharge pipe member 29 is attached to the discharge pipe connection part 31e so that the discharge pipe 31 is aligned with the axis of the discharge hole 31f.

An attachment member 32 is detachably attached to the opening of the cover member 31. The attachment member 32 is made of an elastic material such as rubber or the like.
2a is formed in a substantially cylindrical shape as a whole, and maintains the adhesion of the cover member 31 to the perforated surface 2 to prevent scattering of gel-like discharge generated from inside the perforated hole and to suppress generation of noise. The attachment member 32 has an outer diameter equal to the inner diameter of the waste storage space 31c of the cover member 31, and has a locking flange 32b on the outer periphery.
Are integrally formed. Attachment member 32
The locking flange portion 32b is pushed into the cover member 31 from the base end side thereof until it comes into contact with the opening edge of the discharge storage space 31c.

The attachment member 32 has an inclined surface 32c whose side surface at the base end is inclined with respect to the axis of the drill head 9.
Is configured as In the attachment member 32,
The inner peripheral attachment portion 32d and the outer peripheral attachment portion 32e are formed integrally with the distal end opening. The inner attachment portion 32d and the outer attachment portion 3
2e is equivalent to the above-described attachment member 24, and therefore detailed description thereof is omitted. Attachment member 32 has a discharge hole 3 for gel-like discharge in a long axis portion of the outer peripheral portion.
2f is formed.

The discharge guide member 33 is formed of a disk-shaped member having the same diameter and a large thickness as the discharge storage space 31c of the cover member 31, and as shown in FIG.
a is formed as a vertical surface and the end surface 3 on the perforated surface side
3 b is formed to be inclined in the axial direction corresponding to the inclined surface of the attachment member 32. A drill head guide hole 33c is formed through the discharge guide member 33 at the center thereof. As shown in FIG. 4, the discharge guide member 33 is incorporated into the discharge storage space 31c of the cover member 31 such that a portion having a small thickness corresponds to the discharge hole 31f. The drill head guide hole 33c communicates with the drill head guide hole 31d of the cover member 31 in this state.

The discharge guide member 33 has an inclined end surface 33.
b constitutes the bottom surface of the waste storage space 31c and is incorporated into the cover member 31. In this state, the inclined end face 3
3b is substantially the same as the inclination angle of the discharge hole 31f.
Therefore, the discharge guide member 33 has a
It acts so as to flow well from the inside of the waste storage space 31c of the cover member 31 to the waste collection container 13 through the discharge hole 31f. The discharge guide member 33 acts to suppress the runout of the drill shaft 15 by passing the drill shaft 15 through the drill head guide hole 33c.

The sealing member 34 is also made of an elastic material having wear resistance and chemical resistance, for example, natural rubber, butadiene acrylonitrile rubber (NBR), butadiene rubber (B
R), synthetic rubber such as butadiene styrene rubber (SBR) or a soft synthetic resin. As shown in FIG. 5, the sealing member 34 has a thin outer peripheral portion 34a.
And the bottom portion 34b and the waste storage space 3 inside.
4c is formed in a bottomed cylindrical shape. The sealing member 34 is formed so that the bottom surface portion 34 b is inclined in the axial direction corresponding to the inclined end surface 33 b of the discharge guide member 33 and the inclined surface of the attachment member 32.

The outer diameter of the outer peripheral portion 34 a of the sealing member 34 is the same as the inner diameter of the discharge storage space 31 c of the cover member 31, and the inner diameter of the discharge storage space 34 c is the outer diameter of the attachment member 32. And have the same diameter. The sealing member 34 is formed such that the bottom surface portion 34b is
In a state where the discharge guide member 33 is overlapped with the discharge guide member 33 and has the same axial length as the discharge storage space portion 31c of the cover member 31, it has the same shape.

The sealing member 34 has a shaft guide hole 34d formed at the center of the bottom surface 34b. The inner diameter of the shaft guide hole 34d is
5 is smaller than the outer diameter. Shaft guide hole 3
4d is the sealing member 3 together with the discharge guide member 33.
4 is installed in the discharge storage space 31c of the cover member 31, and each drill head guide hole 31d,
Communicate with the axis line 33c. The drill shaft 15 is fitted into the shaft guide hole 34d as described later.

The sealing member 34 has an outer peripheral portion 34a.
In addition, a discharge hole 34 e having an inner diameter smaller than the outer diameter of the discharge pipe member 29 for discharging the gel-like discharge in communication with the discharge storage space 34 c is formed. Sealing member 34
Is formed of an elastic material, so that the discharge hole 34e
The diameter of the discharge pipe member is increased so that the discharge pipe member 29 is closely fitted to the outer peripheral portion of the discharge pipe member 29. Therefore, the sealing member 34
The outer peripheral portion of the discharge pipe member 29 is sealed.

The discharge scattering prevention mechanism 30 includes a cover member 3
1, a discharge guide member 33 and a sealing member 34.
And the attachment member 32 are assembled in this order to form an assembly. The discharge guide member 33 and the sealing member 34 are assembled such that the inclined end surface 33b and the bottom surface portion 34b are opposed to each other and are combined in the discharge storage space 31c of the cover member 31. The attachment member 32 has its base end side divided by the locking flange 32b assembled in the discharge storage space 34c of the sealing member 34. Therefore, the emission scattering prevention mechanism 30
In addition to the above, the waste storage space 31c of the cover member 31 constitutes an assembly space of each member, and the sealing member 34
The discharge storage space 34c constitutes an installation space for the attachment member 32. In the waste scattering prevention mechanism 30, the storage space for the gel-like waste generated during the drilling operation is constituted by the closed space 32 a of the attachment member 32.

In the discharge scattering prevention mechanism 30, the drill head guide hole 31d of the cover member 31, the drill head guide hole 33c of the discharge guide member 33, and the shaft guide hole 34d of the sealing member 34 are on the same axis. It is located and communicated. Exhaust scattering prevention mechanism 3
In the case of 0, the discharge hole 31f of the cover member 31, the discharge hole 34e of the sealing member 34, and the discharge hole 32f of the attachment member 32 cooperate with each other to form a discharge hole opened in the close contact space 32c of the attachment member 32. are doing. The emission scattering prevention mechanism 30 includes a cover member 31.
Is attached to the bracket member 22, and the discharge pipe member 29 is fitted into the discharge hole.

When the cover member 31 is attached to the bracket member 22, the drill scattering guide mechanism 30 has the drill shaft 1 through the drill head guide hole 31 d.
5 is inserted. The exhaust scattering prevention mechanism 30 specifically includes the drill shaft 15, the drill head guide hole 31 d,
The drill guide hole 33c of the discharge guide member 33 and the shaft guide hole 34d of the sealing member 34 are penetrated to reach the inside of the sealed space 32a of the attachment member 32. As described above, the discharge scattering prevention mechanism 30 has the shaft guide hole 34d of the sealing member 34 whose inner diameter is slightly smaller than the outer diameter of the drill shaft 15, but is formed by an elastic material. The shaft guide hole 34d is fitted and inserted in a state where the diameter of the shaft guide hole is increased and the outer peripheral portion of the drill shaft 15 is in close contact with the outer peripheral portion. Therefore, the discharge scattering prevention mechanism 30 allows the drill shaft 15 to be inserted into the shaft guide hole 34d of the sealing member 34 to seal the outer peripheral portion thereof.

In the emission scattering prevention mechanism 30, when the sealing member 34 gradually wears out with use and cannot provide a sufficient sealing action, it is replaced. In the emission scattering prevention mechanism 30, the cover member 31 is detached from the bracket member 22 and withdrawn from the tip side of the drill head 9, and the attachment member 32 and the sealing member 34 are detached from the cover member 31 in this order. In the emission scattering prevention mechanism 30,
Assembling of the cover member 31 is performed in the reverse order of the above-described removal procedure.

In the above-described embodiment, the wet drill device 1 in which a liquid is used as a base material and a low-boiling organic solvent is jetted and supplied from a bit to perform perforation, but is limited to such a wet drill device. Of course not. The present invention can be applied to, for example, an ordinary wet drilling apparatus that performs drilling while supplying cooling water from the tip of a bit.

[0056]

As described above in detail, according to the wet drilling device of the present invention, the outer peripheral portion of the drill shaft is formed so as to protrude into the inner space of the cover member while being sealed by the sealing member. This prevents the mixed discharge of liquid and dust generated during the drilling operation from being received by the cover member and scattered around, and also allows the sealing member to be partly flowed down the outer peripheral portion of the drill shaft and flow down. This prevents the sealing material from flowing down to the drill body. Therefore, according to the wet drilling device, the mixed effluent flows into the inside of the drill main body to cause insulation failure, or to adhere to a rotating shaft or the like and harden, resulting in poor rotation, and further looking up at a drilled portion. Inconveniences, such as falling on the face of the worker performing the work and soiling the surroundings, are prevented from occurring, and the reliability and usability are improved. In addition, according to the wet drill device, since the sealing member is configured to be detachably attached to the cover member, even if the sealing member is worn due to use, replacement is performed by a simple operation.

[Brief description of the drawings]

FIG. 1 is a front view of a wet drill device according to the present invention.

FIG. 2 is a vertical sectional view of an essential part for explaining a configuration of a discharge scattering prevention mechanism provided in the wet drill device.

FIG. 3 is an exploded vertical sectional view of each member constituting the emission scattering prevention mechanism.

FIG. 4 is a vertical cross-sectional view of a main part illustrating a configuration of another waste scattering prevention mechanism.

FIG. 5 is an exploded vertical sectional view of each member constituting the emission scattering prevention mechanism.

[Explanation of symbols]

1 wet drilling device, 2 drilling surface, 3 drill body,
Reference Signs List 9 drill head, 10 cylindrical housing, 11 drill guide mechanism, 12 waste scattering prevention mechanism, 13 waste collection container, 15 drill shaft, 16 bit, 22 bracket member, 23 cover member, 23c waste storage space, 23d drill head guide hole, 23i discharge hole, 24 attachment member, 25 shaft guide member, 25a drill head guide hole, 26 sealing member, 26a shaft guide hole, 30 discharge scattering prevention mechanism, 31 cover member, 31c discharge storage space Part, 31d drill head guide hole, 32 attachment member, 33 discharge guide member, 34 sealing member, 34c waste storage space, 34d shaft guide hole

Claims (3)

[Claims] 1. A wet drilling apparatus for piercing while supplying a liquid from a bit attached to the tip of a drill shaft, wherein the piercing means is movable in a direction parallel to a piercing direction and urged toward a piercing surface with respect to a drill body. A supported bracket member, Attached to the bracket member, a drill head guide hole provided in the bottom portion is made to penetrate the drill shaft so that the bit faces the waste collection space,
A cover member for discharging mixed waste of dust and the like and the liquid generated in association with the drilling operation of the bit from the waste collection space; and a cover attached to the opening of the cover member, the periphery of the bit during the drilling operation. An attachment member surrounding the hole and a shaft guide hole having a diameter smaller than an outer diameter of the drill shaft, and the shaft guide hole is positioned coaxially with the drill head guide hole to form the cover member. A sealing member formed of an elastic material detachably attached to the sealing member, wherein the drill shaft is inserted into a shaft guide hole of the sealing member so as to be exposed to the waste collection space of the cover member. The outer peripheral portion of which is sealed by the method. 2. The sealing member according to claim 1, wherein the sealing member is formed in a ring shape, and is mounted in a fitting recess formed concentrically with the drill head guide hole on a bottom surface of the cover member. Wet drilling equipment. 3. The wet drilling device according to claim 1, wherein the sealing member is formed in a cylindrical shape with a bottom, and is mounted in a waste collection space of the cover member.