JPH1122359A - Excavator noise suppression device - Google Patents

Abstract

(57) [Problem] A noise of a drilling machine that separates a drill rod from a drill head and covers the drill rod with a compact cover structure to prevent noise emitted from the drill rod without deteriorating workability. Provide a prevention device. A drill head for rotating and hitting a drill rod is connected to the drill rod via a connecting member (2) such as a cleaning swivel, and is mounted on the connecting member (2). The soundproof cover 1 is composed of multiple cylinders 1a to 1e that can be extended and contracted by being fitted to each other so as to be slidable in the direction and that cover the outer periphery of the drill rod when extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing device for a drilling machine, and more particularly, to a drilling machine for drilling by rotating and hitting a drill rod so as to prevent noise due to a hitting sound transmitted to the drill rod. It relates to the intended soundproofing device.

[0002]

2. Description of the Related Art Conventionally, a rotary percussion drill is known as an excavator of this type. This excavator has a mechanism for excavating a bit by rotating and hitting a bit through a drill rod. Speedy excavation can be performed even on gravel and rock layers where excavation is difficult. However, since the impact noise generates noise, the work environment at the site is not good, and when performing excavation work in an urban area, noise countermeasures have become an important issue.

In a rotary percussion drill, the source of the hitting sound is a drill head provided with a hitting mechanism. Regarding the soundproofing of the drill head itself, the applicant of the present application has also disclosed in Japanese Patent Application No. Hei 8-216632. Make useful suggestions. However, the striking sound propagates from the drill head to the drill rod via the cleaning swivel, and in order to take thorough measures, the noise emitted from the drill rod must be considered.

[0004] Conventionally, as a device in which both a drill rod and a drill head are provided with soundproofing, Japanese Patent Application Laid-Open No. 7-30188 has been proposed.
No. 2 or Japanese Patent Application Laid-Open No. 8-28170 is known, in which a slide cover having a size enough to cover a drill rod and an entire drill head is provided on a guide cell. However, this device does not cover
Therefore, the size of the entire machine becomes large, and the workability of inserting a drill rod and removing a pipe becomes extremely poor. Due to such poor workability, the operator may intentionally remove the cover.

Further, as disclosed in Japanese Patent Application Laid-Open No. 6-185055, a drill head and a centralizer are each covered with a box, and a drill rod is covered with a cover made of a bellows tube. I have. However, since this device has a structure in which a bellows tube covering the drill rod is attached between the two boxes, the box is indispensable and cannot be configured as a soundproof device for the drill rod alone. Further, even if such a device is applied to a rotary percussion drill, the drill rod is covered with a bellows tube, so that the drill rod cannot be visually observed, and the situation during drilling cannot be confirmed. For this reason, a jamming accident or the like cannot be prevented beforehand, which may lead to an unexpected large accident.

[0006] Further, a soundproof cover has been developed in which a sound insulating effect is enhanced by watering around a drill rod and a drill head. However, since this device has a structure in which water for sound insulation is stored in the cover, deterioration of the cover due to corrosion of water and generation of offensive odor result in maintenance and replacement of water every few days. There must be. Also, when using coolant liquid for sound insulation,
It becomes a factor of high cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects.

An object of the present invention is to cover a drill rod separately from a drill head with a compact cover structure,
An object of the present invention is to provide an excavator noise prevention device that can prevent noise emitted from a drill rod without deteriorating workability.

Another object of the present invention is to provide a soundproofing device for an excavator that can confirm the rotation state of a drill rod while covering the drill rod with a cover and prevent an accident from occurring. Aim.

Still another object of the present invention is to provide a soundproofing device for an excavator which requires less maintenance when filling a cover with a soundproofing material such as water.

[0011]

The present invention employs the following means to achieve the above object.

[0012] That is, the present invention is a soundproofing device for an excavator in which a drill head for applying rotation and impact to a drill rod is connected to the drill rod via a connection member, the drill head being mounted on the connection member, A noise prevention for an excavator, comprising: a soundproof cover comprising a multi-cylinder that is stretchable by being fitted to each other so as to be slidable in the axial direction and that covers the outer periphery of the drill rod when extended. In the device.

According to the present invention, by attaching the soundproof cover to the connecting member, the drill rod can be separated from the drill head and covered with a compact cover structure.
Noise emitted from the drill rod can be prevented. The connecting member is formed of, for example, a cleaning swivel in a double-pipe excavator. The rear end of the outermost cover member of the soundproof cover is fitted and fixed to the cleaning swivel. That is, the outermost cover member functions not only as an attachment member to the cleaning swivel but also as a soundproof cover of the cleaning swivel.

[0014] The soundproof cover has a stroke that allows the innermost cover member to abut the drill rod guide when extended, thereby covering the entire rod exposed portion from the drill rod guide to the cleaning swivel. . Further, the innermost cover member is provided with fixing means for fixing the drill rod so as to be relatively movable in the axial direction but not to be relatively rotatable. As a result, the innermost cover member rotates together with the rotation of the drill rod, and the operator can visually check the rotation state of the drill rod.

[0015] The outermost cover member is provided with a filling port for filling a sound insulating material into a gap formed between each cover member and the drill rod. Drilling water can be used as the sound insulating material. In this case, a water pipe for drilling water is connected to the filling port. For this reason, work such as water injection and drainage is unnecessary, and since the filling water enters and exits with the expansion and contraction of the soundproof cover, contamination of the inner surface of the cover due to corrosion of the filling water hardly occurs and maintenance is reduced. Each of the cover members has a double-layer structure of an inner layer and an outer layer, and at least the inner layer material is made of a sound deadening material. Rubber or the like can be used as the sound deadening material.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a soundproofing device according to the present invention, and is a sectional view in the axial direction with a soundproofing cover 1 mounted. The soundproof cover 1 is composed of multiple cylinders fitted to each other so as to be slidable in the axial direction, that is, cylindrical cover members 1a, 1b... 1e, and is freely expandable and contractable in the axial direction.

The soundproof cover 1 is mounted on a cleaning swivel 2. The cleaning swivel 2 is a water swivel used for a double tube type excavator, and a drill rod is connected to a drill head via the cleaning swivel 2. That is, the master coupling 3 is provided at the tip of the cleaning swivel 2, and the drill rod R is connected to the screw portion 4 (see FIG. 9). A drill head H is connected to a coupling 5 provided at the rear end of the cleaning swivel 2. A supply port 6 and a discharge port 7 for drilling water are provided on the outer periphery of the cleaning swivel 2.

Although the master coupling 3 and the drill rod connected thereto have the same diameter, the cleaning swivel 2 has a larger diameter. Therefore, the cleaning swivel 2 is provided around the outer periphery of the master coupling 3.
The soundproof cover 1 is attached to the cleaning swivel 2 using this space. Specifically, among the cover members 1a, 1b,... 1e, the outermost cover member 1e has a longer length than the other cover members, and the rear end of the outermost cover member 1e is the cleaning swivel 2. Is removably fitted and fixed to the main body. In this state, the outermost cover member 1e and the master coupling 3
The other cover members 1a, 1b, 1c, and 1d are accommodated between the cover members.

FIG. 2 is a plan view showing the outermost cover member 1e, and FIG. 3 is a sectional view in the axial direction. Outermost cover member 1
A notch 8 in the axial direction is formed at the rear end of e, and a bolt mounting plate 9 is provided at the edge thereof. A filling port 10 for filling the inside of the cover with water is provided on the outer periphery of the outermost cover member 1e, as described later. The outermost cover member 1e is fitted to the cleaning swivel 2 such that the discharge port 7 is received in the notch 8, and is fixed by mounting bolts and nuts 11 to the mounting plates 9, 9 (see FIG. 1). .

On the inner surface of the outermost cover 1e, a silencing material 12, for example, a silencing rubber 12 made of nitrile rubber or the like is provided over the entire surface. The rear end side 12 of this rubber 12
“a” is formed to be thick so as to be in close contact with the cleaning swivel 2. The rubber 12 plays a role of silencing, and also plays a role of packing when the cover is filled with water. An annular protrusion 13 is provided on the inner periphery of the distal end of the outermost cover member 1e to prevent the cover from coming off when the cover is extended. An O-ring 14 is fitted in an annular groove formed in the annular protrusion 13. The O-ring 14 functions as a packing between adjacent cover members when the cover is filled with water, and also has a function as a cushion material for vibration insulation between the cover members.

FIG. 4 is an axial sectional view showing the innermost cover member 1a in an enlarged manner, FIG. 5 is a plan view of the tip, and FIG.
FIG. A notch 15 extending in the axial direction is formed at the tip of the innermost cover member 1a, and a fastener 16 is provided so as to straddle the notch 15. The fastener 16 constitutes fixing means for fixing the innermost cover member 1a to the drill rod, and for example, an adjust fastener (trade name) manufactured by Takigen Corporation can be used.

The fastener 16 includes a rotary lever 17 provided on one peripheral surface sandwiching the cutout 15, and a rod 18 provided on the other peripheral surface and having a tip connected to the rotary lever 17 and having an adjustable length. Consists of By rotating the rotation lever 17, the notch 15 is narrowed, whereby the drill rod is tightened and fixed. This fixation allows relative movement in the axial direction between the innermost cover member 1a and the drill rod, but is such that relative rotation is not possible. Therefore, the innermost cover member 1a rotates together with the rotation of the drill rod.

On the inner surface of the innermost cover member 1a, a silencing rubber 12 similar to that described above is provided over substantially the entire surface. The rubber 12 has a function of packing when water is filled in the cover by being in close contact with the drill rod, in addition to the sound deadening function. An annular projection 1 is provided on the outer periphery of the rear end of the innermost cover member 1a to prevent the cover from coming off when the cover is extended.
9 are formed.

FIG. 7 shows another cover member 1b, 1 between the innermost cover member 1a and the outermost cover member 1e.
It is an axial direction sectional view showing c and 1d. The same rubber 12 as described above is also provided on the inner surfaces of these cover members 1b, 1c and 1d.
Are provided over almost the entire surface. Further, annular protrusions 13 and 19 similar to the above are formed on the inner periphery of the front end and the outer periphery of the rear end of the cover members 1b, 1c and 1d, respectively, and these annular protrusions 13 and 19 are engaged with each other. Removal of the cover when the cover is extended is prevented. Further, the cover member 1b,
A snap ring 20 is provided at the tip of each of 1c and 1d to prevent the cover from coming off when the cover is contracted.

As described above, each of the cover members 1a, 1b.
"e" has a double-layer structure in which an outer layer constituting the cover main body and an inner layer which is a rubber layer for noise reduction are bonded together. Thus, the vibration damping property can be improved. However, the noise reduction effect of the cover can be further enhanced by combining materials having excellent sound absorbing properties and using a porous sound absorbing plate. Therefore, the material of the inner layer and the outer layer is not limited to a metal material or a non-metal material.

Next, the operation of the above embodiment will be described. FIG. 8 is a plan view for explaining the operation, and FIG. 9 is an axial sectional view. A drill head H is connected to the cleaning swivel 2, and a drill rod R is connected to the master coupling 3. As shown in FIG. 9, a branch pipe 23 having a choke valve 22 is provided in a water supply pipeline 21 connecting the pump P for supplying drilling water and the supply port 6, and the branch pipe 23 is provided with a filling port 10. Connected to.

After the connection of the drill rod R, as shown in FIG. 8A, the innermost cover member 1a is pulled out, and the soundproof cover 1 is extended. The tip of the innermost cover 1a contacts the drill rod guide 25 with the soundproof cover 1 extended. That is, the soundproof cover 1 has a stroke covering the entire rod exposed portion from the drill rod guide 25 to the cleaning swivel 2.

After covering the drill rod R, the innermost cover member 1a is fixed to the drill rod R by the fastener 16. In addition, the gap formed between the extended soundproof cover 1 and the drill rod R is filled with drilling water via the branch conduit 23 and the filling port 10.

In this way, the setup is completed, the drill head H is advanced by the feeding mechanism, and the drilling is started while the drill rod H is rotated and hit by the operation of the drill head H. During the excavation, an impact sound propagates to the drill rod R, but since the drill rod R is covered with the drilling water and the soundproof cover 1, noise can be suppressed from leaking to the outside. In addition, the filling water plays a role of damping the vibration and insulating the sound. Further, since the outermost cover member 1e is fitted and fixed to the cleaning swivel 2, the cleaning swivel 2 and the master coupling 3 are fixed.
Also plays the role of a silence cover.

Since the gap formed between the soundproof cover 1 and the drill rod R is in a completely sealed environment as described above, it is piped directly from the water supply pipe 21 of the drilling water to supply the drilling water. It can be used as filling water and does not require operations such as water injection and drainage. The filling water enters and exits each time the soundproof cover 1 repeats expansion and contraction, so that contamination of the inner surface of the cover due to corrosion of the filling water or the like can be suppressed as much as possible, resulting in excellent maintainability.

During the excavation, since the innermost cover member 1a is fixed to the drill rod R, it rotates together with the rotation of the drill rod R. For this reason, the rotation state of the drill rod R can be visually observed, and occurrence of an accident can be prevented. Innermost cover member 1a with fastener 16
Of the innermost cover member 1a slides with the drill rod guide 25 as a stopper as the excavation proceeds. Therefore, when the excavation of one drill rod R is completed, the cover members 1a to 1d are drawn into the outermost cover member 1e, and the soundproof cover 1 is in a contracted state. As the soundproof cover 1 shrinks, the filling water is
3 flows back and is discharged.

Thereafter, the preceding drill rod R is cut off from the master coupling 3, the drill head H is retracted, and a new drill rod R is added to the master coupling 3. After the rod is added, the fixing of the fastener 16 is released, and the soundproof cover 1 is extended in the same manner as described above.

In the above embodiment, the case where the connecting member is a cleaning swivel of a double tube type excavator has been described, but the present invention can be applied to a single tube type excavator. Also,
Filling water takes into account the sound insulation effect, maintenance and workability during use.However, foam using highly compressible surfactant or particles with good resilience using polymer materials are used. It is also possible to repeatedly use it by enclosing it in a void. These foams and particles have a function as a sound deadening material.

[0034]

As described above, according to the present invention, the drill rod is separated from the drill head and covered with a compact cover structure to prevent noise emitted from the drill rod without deteriorating workability. Can be. Also, while the drill rod is covered with the cover, the rotation status can be checked, and occurrence of an accident can be prevented. Further, even when the cover is filled with a sound insulating material such as water, maintenance can be minimized.
It should be noted that the device according to the present invention can be easily attached and detached to a ready-made excavator by retrofitting.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a soundproofing device according to the present invention, and is an axial sectional view in a state where a soundproof cover is mounted.

FIG. 2 is a plan view showing an outermost cover member.

FIG. 3 is an axial cross-sectional view of the above device.

FIG. 4 is an axial sectional view showing an innermost cover member in an enlarged manner.

FIG. 5 is a plan view of a tip end of the above.

FIG. 6 is a left side view of FIG. 5;

FIG. 7 is an axial sectional view showing another cover member disposed between the innermost cover member and the outermost cover member.

FIG. 8 is a plan view for explaining the operation.

FIG. 9 is an axial sectional view for explaining the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Soundproof cover 1a-1e ... Cover member 1a ... Innermost cover member 1e ... Outermost cover member 2 ... Cleaning swivel 3 ... Master coupling 5 ... Coupling 6 ... Supply port 7 ... Discharge port 8 ... Notch 10 ... Filling Mouth 12 ... Rubber 13 ... Annular protrusion 14 ... O-ring 15 ... Notch 16 ... Fastener 19 ... Annular protrusion 20 ... Snap ring H ... Drill head R ... Drill rod

Claims (8)

[Claims] A drill head for rotating and hitting a drill rod is connected to the drill rod via a connecting member, and is mounted on the connecting member to slide in an axial direction. A noise prevention device for an excavator, comprising: a soundproof cover that is movably fitted to each other so as to be able to expand and contract and that covers an outer periphery of the drill rod when extended. 2. The apparatus according to claim 1, wherein said connecting member is a cleaning swivel of a double pipe type excavator. 3. The excavator noise prevention device according to claim 2, wherein the rear end of the outermost cover member of the soundproof cover is fitted and fixed to the cleaning swivel. 4. The noise prevention device for an excavator according to claim 2, wherein the innermost cover member of the soundproof cover has a stroke capable of contacting the drill rod guide when the soundproof cover is extended. . 5. A fixing means for fixing the innermost cover member to the drill rod so as to be movable relative to the drill rod in the axial direction but not to rotate relative to the drill rod. Item 5. The soundproofing device for an excavator according to Item 4. 6. A filling port for filling a sound insulating material into a gap formed between each cover member and the drill rod in the outermost cover member. The soundproofing device for an excavator according to any one of claims 1 to 6. 7. The sound insulation material is drilling water, and a water pipe for drilling water is connected to the filling port.
The soundproofing device of the excavator according to the above. 8. The soundproofing of an excavator according to claim 1, wherein each of the cover members has a double-layered structure of an inner layer and an outer layer, and at least the inner layer material is made of a sound deadening material. apparatus.