JP2020165302A - Earth drill - Google Patents

Abstract

To prevent drilling mud scattered by a centrifugal force due to the rotation of a sheave from attaching to a surrounding structure.SOLUTION: An earth drill comprises a self-movable vehicle body provided with a winch, a boom in which a base end side is attached to the vehicle body, one or more sheaves rotatably disposed at a tip side of the boom, a rope wound around the winch, a kelly bar rotatably suspended from the rope through the sheave, and a drilling tool mounted to a lower end side of the kelly bar. The earth drill comprises a scattering prevention device provided with a cover receiving drilling mud scattered by a centrifugal force from the rope wound around the sheave when winding the rope by the winch.SELECTED DRAWING: Figure 8

Description

The present invention relates to an earth drill.

At construction sites such as buildings, work is performed to solidify the ground by pouring concrete or the like into a shaft excavated deep underground. An earth drill is used to excavate a shaft in the ground.

During excavation work of a shaft, a liquid called a stabilizer is usually injected into the shaft to prevent the inner wall of the excavated shaft from collapsing due to this stabilizer. Therefore, the shaft is filled with muddy water mixed with stabilizing liquid, groundwater, etc., and when the excavation depth becomes large, not only the excavation bucket but also the wire rope and the like are submerged in the muddy water. Therefore, when the wire rope is wound up by the winch and the excavation bucket is pulled up to the ground in order to discharge the earth and sand in the excavation bucket, the rope soaked in muddy water is caught in the sheave at the tip of the boom.

In order to prevent the muddy water adhering to the wire rope from falling toward the ground when the wire rope is caught in the sheave, a bottomed muddy water receiver having an inflow opening for the muddy water to flow in is provided under the sheave. An earth drill is known (see Patent Document 1).

JP-A-2002-349175

The muddy water adhering to the wire rope is scattered in the tangential direction of the sheave due to the centrifugal force of the rotation of the sheave. Therefore, when working at a construction site or the like where there are structures densely around the earth drill, muddy water scattered from the wire rope may adhere to the surrounding structures. The above-mentioned Patent Document 1 describes a configuration for preventing muddy water adhering to the wire rope from falling to the ground, but describes a configuration for preventing muddy water from scattering due to the centrifugal force of rotation of the sheave. There is no.

The earth drill according to one aspect of the present invention includes a self-propelled vehicle body equipped with a winch, a boom whose base end side is attached to the vehicle body, and one or more sheaves rotatably provided on the tip side of the boom. In an earth drill provided with a rope wound around the winch, a kelly bar rotatably suspended from the rope via the sheave, and an excavator attached to the lower end side of the kelly bar. When the rope is wound by a winch, it is provided with a scattering prevention device provided with a cover that receives muddy water scattered by centrifugal force from the rope wound around the sheave.

According to the present invention, it is possible to prevent the muddy water scattered by the centrifugal force of the rotation of the sheave from adhering to the surrounding structure.

External side view of the earth drill. The figure explaining the state at the time of excavation work of a shaft. A perspective view showing the tip of the boom. The perspective view which shows the structure of the anti-scattering device. Side view of the shatterproof device as seen from the side. Top view of the shatterproof device from above. An exploded perspective view of the shatterproof device. The figure explaining the scattering prevention area of muddy water by the cover of the scattering prevention device. The perspective view explaining the operation of the anti-scattering device at the time of attaching / detaching the main winding rope. The side view explaining the operation of the shatterproofing device at the time of attaching / detaching the main winding rope. The schematic diagram which shows the scattering prevention device of the earth drill which concerns on a modification.

Hereinafter, an embodiment of the earth drill according to the present invention will be described with reference to the drawings.
FIG. 1 is an external side view of the earth drill according to the present embodiment. In the following, as shown in the figure, the vertical and front-back and left-right directions of the earth drill 1 are defined with reference to the posture of FIG. The earth drill 1 uses a crane as a base machine.

The earth drill 1 is attached to a crawler type lower traveling body 2, an upper rotating body 4 rotatably provided on the lower traveling body 2 via a swivel wheel, and a base end side rotatably attached to the upper swivel body 4. The boom 7, the front frame 18 whose base end side is rotatably attached to the upper swing body 4, the kelly drive device 30 attached to the front frame 18, the crawler 14, and the like.
Is equipped with. The upper swing body 4 is provided with a machine room 5 provided with a hydraulic source, a power source, an engine, and the like, and a driver's cab 6 provided with a driver's seat and an operating device on which an operator sits. Upper swivel body 4
And the lower traveling body 2 constitute a self-propelled vehicle body.

The upper swing body 4 is equipped with a hydraulic cylinder 8 for raising and lowering the boom 7, a main winding winch 10a around which the main winding rope 16a is wound, and a supplementary winch 10b around which the auxiliary winding rope 16b is wound. The main winding rope 16a is a wire rope for hoisting, and one end side is a main winding winch 1.
It is wound around 0a, and the other end side is connected to the kelly bar 14 via one or more sheaves rotatably provided on the tip end side of the boom 7. The keriva 14 is rotatably suspended from the main winding rope 16a via a sheave. The kelly bar 14 is installed in the kelly drive device 30 and is rotationally driven by the kelly drive device 30.

The auxiliary winding rope 16b is a wire rope for hoisting, and is connected to the hook via a plurality of sheaves provided at the tip of the boom 7. The main winding winch 10a and the auxiliary winding winch 10b are winch devices for hoisting, respectively, and include a drum around which a wire rope is wound and a hydraulic motor for rotating the drum.

The front frame 18 is undulated by the expansion / contraction drive of a pair of left and right hydraulic cylinders 20 provided between the front frame 18 and the boom 7. An upper frame 22 that supports the kelly drive device 30 is rotatably connected to the tip of the front frame 18. The upper frame 22 is rotated by the expansion / contraction drive of the hydraulic cylinder 24.

A drive hole is provided in the rotating portion 30a of the kelly drive device 30 so as to penetrate vertically.
A telescopic keriba 14 is inserted into the drive hole so as to be vertically movable and relatively non-rotatable. The kelly bar 14 is formed by fitting a plurality of cylindrical kelly bars of different sizes in an expandable and non-relatively non-rotatable manner, and is configured into, for example, a 3-stage type, a 4-stage type, a 5-stage type, or the like.

An excavation bucket 15 is detachably attached to the lower end of the innermost inner kelly bar via an adapter 11, and the ground is excavated by the rotation of the kelly bar 14. A main winding rope 16a is connected to the innermost inner keriva via a swivel joint 13 which is a rotary joint. A thimble 19 is provided at the tip of the main winding rope 16a, and the swivel joint 13 is connected to the thimble 19. When the multi-stage keriva 14 is in the fully extended state, the main winding rope 16a extends through the inside of the multi-stage keriva 14 to the lowermost inner keriva (see FIG. 2).

FIG. 2 is a diagram illustrating a state during excavation work of a shaft. As shown in FIG. 2, during the excavation work of the shaft, a liquid called a stabilizer is usually injected into the shaft to prevent the inner wall of the excavated shaft from collapsing due to the stabilizer. Bentonite is used as the main material of the stabilizer. Therefore, the shaft is filled with muddy water 95 mixed with stabilizing liquid, groundwater, etc., and when the excavation depth becomes large, not only the excavation bucket 15, but also the swivel joint 13, the main winding rope 16a, etc. are filled with muddy water 95. Submerged inside. Therefore, when the main winding rope 16a is wound up by the main winding winch 10a and the excavation bucket 15 is pulled up above the ground in order to discharge the earth and sand in the excavation bucket, the main winding rope 16a immersed in the muddy water 95 is booming 7.
You will be caught in the sheave provided at the tip of. The muddy water adhering to the main winding rope 16a is scattered in the tangential direction of the sheave due to the centrifugal force of the rotation of the sheave. For this reason, if no measures are taken, muddy water scattered from the main winding rope 16a may adhere to the surrounding structure 90 when working at a construction site or the like where the structure 90 is densely packed around. There is.

Therefore, in the present embodiment, when the main winding rope 16a is wound by the main winding winch 10a, a cover 161 for receiving muddy water scattered by centrifugal force from the main winding rope 16a wound around the sheave 110 is provided. The prevention device 160 is provided. Hereinafter, the configuration of the shatterproof device 160 will be described in detail.

FIG. 3 is a perspective view showing the tip end portion of the boom, and FIG. 4 is a view in which the boom and the sheave support plate shown in FIG. 3 are not shown, and is a perspective view showing the configuration of the shatterproof device. FIG. 5 is a side view of the shatterproof device as viewed from the side, and FIG. 6 is a plan view of the shatterproof device as viewed from above. In the figure, the shatterproof device 160 and the main winding rope 16a are shown by solid lines or broken lines, and other configurations are shown by two-dot chain lines. FIG. 7 is an exploded perspective view of the shatterproof device.

As shown in FIGS. 3 and 6, a pair of left and right sheave support plates 132 are provided at the tip of the boom 7. A short jib 131 is attached to the pair of left and right sheave support plates 132. An auxiliary sheave 114 is pivotally supported at the tip of the short jib 131.

Shafts 181, 182 extending in the left-right direction are attached to the pair of left and right sheave support plates 132. The shafts 181, 182 have a pair of sheave support plates 1 at both ends.
It is fixed to the boss 133 of 32 and is supported by both sides. The shaft 181 rotatably supports the guide sheaves 111 and 119. The shaft 182 rotatably supports a plurality of sheaves including the point sheave 112. The point sheave 112 is provided at a substantially tip on the ventral side of the boom 7, and the guide sheaves 111 and 119 are provided at a substantially tip on the back surface side of the boom 7.

As shown in FIGS. 3 to 6, the main winding rope 16a has a guide sheave 11 at the tip of the boom 7.
It is connected to the Keriva 14 via 1 and the point sheave 112. As shown in FIG. 1, the auxiliary winding rope 16b includes a guide sheave 119 and an auxiliary sheave 1 at the tip of the boom 7.
It is connected to the hook via 14.

As shown in FIG. 7, the shatterproof device 160 is provided on each of the guide sheave 111 and the point sheave 112. Since the shatterproof device 160A for the guide sheave and the shatterproof device 160B for the point sheave have the same configuration, both are collectively referred to as the shatterproof device 160. Further, for convenience of explanation, the guide sheave 111 and the point sheave 112 are also collectively referred to as a sheave 110. The shatterproof device 160 includes a cover 161, a pair of left and right holding members 162 that rotatably hold the cover 161 and a fixing bar 163 that detachably attaches the cover 161 to the tip end side of the boom 7.

As shown in FIG. 6, a plurality of collars 134 are mounted on the shaft 181. The plurality of collars 134 are cylindrical members and are arranged between the sheave support plate 132 and the guide sheave 111 to regulate the position of the guide sheave 111. Similarly, on the shaft 182,
A plurality of collars 134 are mounted to regulate the position of the point sheave 112. Of the plurality of collars 134, a rectangular elongated holding plate 135 is fixed to each of the pair of left and right collars 134a located on the sheave side.

As shown in FIG. 7, the holding member 162 is composed of a collar 134a and a holding plate 135. The base end portion of the holding plate 135 is fixed to the collar 134a as described above, and a pin hole 135p into which the pin 136 is inserted is formed at the tip end portion of the holding plate 135. The cover 161 is a covering member that covers the outside of the sheave 110 in the radial direction. The cover 161 has a shielding plate 164 that covers the radial outer side of the main winding rope 16a attached to the groove provided on the outer periphery of the sheave 110, and the left and right sides of the main winding rope 16a attached to the groove of the sheave 110. It has a pair of side plates 165 to cover. The cover 161 has a U-shaped cross section because the side plates 165 are fixed to the left and right ends of the shielding plate 164 so as to be perpendicular to the shielding plate 164.

A pin insertion hole 166 through which the pin 136 is inserted is formed on one end side of the cover 161. The pin insertion holes 166 are formed in each of the pair of side plates 165. Cover 161
A bar insertion hole 167 through which the fixing bar 163 is inserted is formed on the other end side of the above. The bar insertion holes 167 are formed in each of the pair of side plates 165.

The pin 136 is inserted into the pin hole 135p of the pair of holding members 162 and the pin insertion hole 166 of the cover 161, and the fixing pins (pine needle pins) are attached to both ends of the pin 136.
The cover 161 is rotatably held by a pair of holding members 162.

As shown in FIG. 3, the fixing bar 163 is inserted into a through hole provided in the pair of sheave support plates 132 and supported by the pair of sheave support plates 132. A pair of collars 139 are attached to the fixed bar 163. The pair of collars 139 are cylindrical members and are arranged between the sheave support plate 132 and the side plate 165 of the cover 161. By sandwiching the cover 161 from the left and right with a pair of collars 139, the position of the cover 161 in the left-right direction is regulated.

The fixing bar 163 is a through hole provided in the pair of sheave support plates 132, and a pair of collars 13.
The cover 161 is fixed by the fixing bar 163 by being inserted into the bar insertion holes 167 of the cover 161 and the cover 161 and by attaching stop pins (pine needle pins) to both ends of the fixing bar 163. The cover 161 is held by a fixing bar 163 and a pin 136. As a result, the shielding plate 164 is held at a position radially outwardly separated from the sheave 110 by a predetermined distance so that the main winding rope 16a wound around the sheave 110 does not interfere with each other.

The fixed bar 163 and the collar 139 are also rod-shaped members for preventing the rope from coming off the sheave 110. The fixing bar 163 and the collar 139 are provided to prevent the main winding rope 16a wound around the sheave 110 from falling out of the groove of the sheave 110, and the sheave 11 is provided.
The shortest distance between the outer peripheral edge of 0 and the collar 139 is arranged so as to be shorter than the diameter of the main winding rope 16a.

One end of the cover 161A of the guide sheave 111 on the point sheave 112 side is rotatably attached to the holding member 162 attached to the shaft 181 of the guide sheave 111, and the other end side is the tip end side of the boom 7 by the fixing bar 163. It is detachably attached to. On the other hand, in the cover 161B of the point sheave 112, one end side on the guide sheave 111 side is rotatably attached to the holding member 162 attached to the shaft 182 of the point sheave 112, and the other end side is rotatably attached by the fixing bar 163. It is detachably attached to the tip side of the boom 7.

With reference to FIG. 8, the muddy water scattering prevention region by the cover 161A of the guide sheave shatterproof device 160A and the muddy water scattering prevention region by the cover 161B of the point sheave shatterproof device 160B will be described. FIG. 8 is a diagram illustrating a muddy water scattering prevention region by the cover of the scattering prevention device.

As schematically shown by arrows A, A1, A2, and A3 in FIG. 8, when the main winding rope 16a is wound by the main winding winch 10a, the muddy water adhering to the main winding rope 16a wound around the sheave 110 is removed. Due to the centrifugal force generated by the rotation of the sheave 110, the main winding rope 16a flies in the tangential direction of the arcuate portion. As shown by hatching in FIG. 8, the arcuate portion of the main winding rope 16a in contact with the guide sheave 111 is referred to as an arcuate portion 169a, and the arcuate portion of the main winding rope 16a in contact with the point sheave 112 is referred to as an arcuate portion 169b. Write. In the following description, in each component, the side closer to the main winch 10a is referred to as the winch side and the side closer to the keriva 14 is referred to as the keriva side in the direction along the main winding rope 16a.

In the movement path from the keriba 14 (see FIG. 1) to the point sheave 112, the main winding rope 16a moves vertically upward and linearly. Main winding rope 16 reaching point sheave 112
The traveling direction of a is changed, and the a moves in an arc shape. In this arc-shaped movement path, the arc-shaped portion 1
The muddy water adhering to 69b flies in the tangential direction due to centrifugal force (see arrows A2 and A3).

The main winding rope 16a away from the point sheave 112 moves linearly toward the guide sheave 111 in parallel with the line segment L connecting the rotation center axis O2 of the point sheave 112 and the rotation center axis O1 of the guide sheave 111. .. The main winding rope 16a that has reached the guide sheave 111
The direction of travel is changed and it moves in an arc shape. In this arc-shaped movement path, the arc-shaped portion 169a
The muddy water adhering to the water flies in the tangential direction due to centrifugal force (see arrow A1).

The main winding rope 16a away from the guide sheave 111 moves linearly toward the main winding winch 10a. In each linear movement path, muddy water hardly scatters from the main winding rope 16a unless it is affected by wind, vibration, or the like.

Extension area C of the shielding plate 164 of the cover 161 of the shatterproof device 160B for point sheave
2 will be described. The extending region C2 is provided from the vicinity of the end portion of the guide bar 190 to the vicinity of the end portion of the cover 161 of the shatterproof device 160A for the guide sheave, and the covering portion C20.
A cover portion C21, a cover portion C22a, and a cover portion C22b are provided.

The covering portion C21 is a flat surface including the end portion Pw2 on the winch side of the arcuate portion 169b and the straight line SL22 passing through the rotation center axis O2 of the point sheave 112, and the arcuate portion C21 at the end portion Pk2 on the keriba side of the arcuate portion 169b. It is a region covering the radial outer side of the point sheave 112 in the range between the outer circumference of 169b and the plane including the tangent line TL2. In other words, the covering portion C21 is a point outside the radial direction of the winch-side end Pw2 of the arcuate portion 169b, that is, a point P22 intersecting the straight line SL22 and a point intersecting the tangent line TL2 parallel to the vertical direction. This is an area connecting with P21. In other words, the covering portion C21 has a straight line SL22 in a side view.
This is a region that covers the radial outer side of the arcuate portion 169a between the rotation center axis O2 and the straight line SL21 passing through the point P21. The covering portion C21 is a shielding plate 1 from the rotation center axis O2 of the point sheave 112.
It is formed in an arc shape so that the distances to 64 are almost the same.

The covering portion C20 is an arc-shaped portion 169 at the end Pk2 on the keriba side of the arc-shaped portion 169b.
It is a region extending from the point P21 intersecting the tangent line TL2 of b toward the keriba 14. The covering portion C20 is provided so as to cover the outside of the fixed bar 163. The cover portion C20 extends to the front of the guide bar 190 so as not to interfere with the guide bar 190. The guide bar 190 is a rope guide member that regulates the movement of the main winding rope 16a between adjacent sheaves in the axial direction of the shaft 182, and is provided between the adjacent sheaves (see FIG. 4). The guide bar 190 has a circular cross section and is C-shaped when viewed from the side.

The covering portion C22a is a point P2 outside the radial direction of the end portion Pw2 on the winch side of the arcuate portion 169b.
A region extending from 2 toward the main winch 10a, at point P23 near pin 136.
It has been extended to. The covering portion C22a extends from the point P22 toward the rear so that the distance of the point sheave 112 from the rotation center axis O2 gradually increases.

The cover portion C22b is a region that bends from the point P23 and extends toward the main winch 10a, and extends close to the end portion of the cover 161 of the shatterproof device 160A. here,
A straight line that passes through the point P29 where the line segment L and the outer periphery of the point sheave 112 intersect and is orthogonal to the rotation center axis O2 of the line segment L and the point sheave 112 is defined as a straight line SL29. Cover C22
b extends to the guide sheave side with respect to the plane including the straight line SL29. Cover C22
By providing the covering portion C22b bent from a, the arcuate portion 16 of the point sheave 112
The amount of muddy water flying from the vicinity of the winch-side end Pw2 of 9b toward the adjacent shatterproof device 160A can be reduced. The pin insertion hole 166 through which the pin 136 is inserted has a covering portion C22a.
It is provided in the vicinity of the point P23 which is the boundary portion between the cover portion C22b and the cover portion C22b.

Extension area C1 of the shielding plate 164 of the cover 161 of the shatterproof device 160A for the guide sheave
Will be described. The extending region C1 extends from the vicinity of the end portion of the cover 161 of the shatterproof device 160B toward the main winding winch 10a so as to cover the radial outer side of the arcuate portion 169a, and covers the covering portion C10a and the covering portion C10a. A portion C10b, a covering portion C11, and a covering portion C12 are provided.

The cover portion C11 includes an end portion Pw1 on the winch side of the arcuate portion 169a and a guide sheave 1.
The diameter of the guide sheave 111 in the range between the plane including the straight line SL12 passing through the rotation center axis O1 of 11 and the plane including the tangent TL1 on the outer periphery of the arcuate portion 169a at the end Pk1 on the Keriba side of the arcuate portion 169a. It is an area that covers the outside of the direction. In other words, cover part C
Reference numeral 11 denotes a point outside the radial direction of the winch-side end Pw1 of the arcuate portion 169a, that is, a straight line S.
This is the region connecting the point P12 that intersects with L12 and the point P11 that intersects with the tangent TL1. In other words, the covering portion C11 has a straight line SL12, a rotation center axis O1 and a point P in a side view.
It is a region covering the radial outer side of the arcuate portion 169a between the straight line SL11 passing through 11. The covering portion C11 is formed in an arc shape so that the distance from the rotation center axis O1 of the guide sheave 111 to the shielding plate 164 is substantially the same.

The covering portion C10a is a flat surface including the end portion Pk1 on the keriba side of the arcuate portion 169a and the straight line SL10 passing through the rotation center axis O1 of the guide sheave 111, and the arcuate portion Pk1 at the end portion Pk1 on the keriba side of the arcuate portion 169a. It is a region covering the radial outer side of the guide sheave 111 in the range between the outer circumference of 169a and the plane including the tangent line TL1. In other words, the covering portion C10a is a region connecting the radial outer point of the end portion Pk1 on the Keriba side of the arcuate portion 169a, that is, the point P10 intersecting the straight line SL10 and the point P11 intersecting the tangent line TL1. Is. In other words, the covering portion C10a is a region that covers the radial outer side of the arcuate portion 169a between the straight line SL10 and the straight line SL11 in the side view. The covering portion C10a is formed in an arc shape so that the distance from the rotation center axis O1 of the guide sheave 111 to the shielding plate 164 is substantially the same.

The covering portion C10b is a point P1 outside the radial direction of the end portion Pk1 on the keriba side of the arcuate portion 169a.
It is an area extending from 0 toward Keriba 14, and is a cover 16 of the shatterproof device 160B.
It is near the end of 1B and extends close to pin 136. Here, the line segment L and the guide sheave 1 pass through the point P19 where the line segment L and the outer circumference of the guide sheave 111 intersect.
A straight line orthogonal to the rotation center axis O1 of 11 is defined as a straight line SL19. The covering portion C10b extends to the point sheave side with respect to the plane including the straight line SL19. The covering portion C10b is a point P.
The guide sheave 111 extends from 10 toward the front so that the distance from the rotation center axis O1 gradually increases. At the end of the covering portion C10b, a bent portion bent so as to cover the collar 139 is provided. The pin insertion hole 166 through which the pin 136 is inserted has a covering portion C10.
It is provided near the end of b.

The covering portion C10a and the covering portion C10b are formed by the main winding winch 10a and the main winding rope 16a.
Main winding rope 16a wound around the point sheave 112, which is the next sheave, when winding up
It has a function as a receiving part for receiving muddy water flying from the arc-shaped part 169b (FIG. 8).
See arrow A3). With such a configuration, the shatterproof device 160 for the guide sheave
Even when a gap is formed between the cover 161A of A and the cover 161B of the anti-scattering device 160B for point sheave, it is possible to prevent muddy water from adhering to the surrounding structure 90. In the present embodiment, the cover portion C10b is the shielding plate 164 of the cover 161B.
It is formed so as to include a point Pr that intersects the tangent line TL3 of the arcuate portion 169b that passes through the end point Px on the winch side of the above.

The covering portion C12 is a point P12 outside the radial direction of the end portion Pw1 on the winch side of the arcuate portion 169a.
It is a region extending from the main winding winch 10a. The covering portion C12 extends from the point P12 toward the main winch 10a so that the distance of the point sheave 112 from the rotation center axis O1 gradually increases.

By the way, the area of each covering portion described above changes depending on the angle of the boom 7. For this reason,
Anti-scattering device so as to satisfy at least the following conditions in both postures of the boom angle corresponding to the minimum working radius when the earth drill 1 is working and the boom angle corresponding to the maximum working radius when working the earth drill 1. It is preferable to set the extension area of the cover 161 of 160.

(Condition) A plane including the winch-side end Pw1 of the arcuate portion 169a of the main winding rope 16a in contact with the guide sheave 111 and the straight line SL12 passing through the rotation center axis O1 of the guide sheave 111, and the kelly bar of the arcuate portion 169a. It covers the radial outer side of the guide sheave 111 in the range between the arcuate portion 169a at the side end Pk1 and the plane including the tangent TL1 on the outer circumference.

As a result, it is possible to effectively prevent muddy water from scattering backward regardless of the working posture. On the other hand, the direction in which the muddy water flies along the tangent line TL2 of the outer circumference of the arcuate portion 169a at the end Pk2 of the arcuate portion 169b of the main winding rope 16a in contact with the point sheave 112 on the keriba side is vertically upward. .. Therefore, even if the vertical upper part is not covered, there is little possibility that muddy water adheres to the surrounding structure 90, so that it is not always necessary to cover the vertical upper part.

9 and 10 are perspective views and side views illustrating the operation of the shatterproof device when the main winding rope is attached / detached. As shown in FIG. 9, when attaching or removing the main winding rope 16a, the operator pulls out the fixing bar 163 and removes the collar 139. After that, the operator rotates the cover 161 with the pin 136 as a rotation fulcrum. Here, the holding member 162 can be rotated with the shafts 181 and 182 as rotation fulcrums.

As shown in FIG. 9, the pair of covers 161A and 161B rotate so that the back surface side and the ventral surface side of the boom 7 are opened. As a result, when attaching the main winding rope 16a, the operator passes the thimble 19 provided at the tip of the main winding rope 16a through the open space between the guide sheave 111 and the winch side end of the cover 161A. It can be easily inserted. After that, the operator can easily pull out the thimble 19 provided at the tip of the main winding rope 16a through the open space between the point sheave 112 and the Keriba side end of the cover 161B. Similarly, when removing the main winding rope 16a, the thimble 19 provided at the tip of the main winding rope 16a can be passed between the cover 161 and the sheave 110 without removing all the covers 161.

According to the above-described embodiment, the following effects can be obtained.
(1) A shatterproof device 160 provided with a cover 161 for receiving muddy water scattered by centrifugal force from the main winding rope 16a wound around the sheave 110 when the main winding rope 16a is wound by the main winding winch 10a. ing. As a result, it is possible to prevent the muddy water scattered by the centrifugal force of the rotation of the sheave 110 from adhering to the surrounding structure 90.

(2) One or more sheaves 110 provided on the tip side of the boom 7 include a winch-side guide sheave 111 and a keriba-side point sheave 112, and the shatterproof device 160 includes a guide sheave 111 and a point sheave. It is provided in each of 112. Since the scattering prevention device 160 is provided for each, it is possible to suppress the scattering of muddy water as compared with the case where the scattering prevention device 160 is provided only on one side.

(3) At least, the cover 1 of the shatterproof device 160A of the guide sheave 111 on the winch side.
61A includes a winch-side end Pw1 of the arcuate portion 169a of the main winding rope 16a in contact with the guide sheave 111, and a straight line SL12 passing through the rotation center axis O1 of the guide sheave 111.
A covering portion C11 that covers the radial outer side of the guide sheave 111 in the range between the arcuate portion 169a and the tangent line TL1 of the arcuate portion 169a at the end Pk1 on the keriba side is provided. The covering portion C11 is tangent to the straight line SL12 in both postures of the boom angle corresponding to the minimum working radius when the earth drill 1 is working and the boom angle corresponding to the maximum working radius when the earth drill 1 is working. Guide sheave 111 in the range between TL1
The extending region C1 of the shielding plate 164 of the cover 161A is set so as to cover the outer side in the radial direction of the cover 161A. As a result, it is possible to suppress the scattering of muddy water in any posture during the work of the earth drill 1.

(4) Further, the cover 16 of the shatterproof device 160B of the point sheave 112 on the Keriba side.
1B is a main winding rope 16 that contacts the point sheave 112 in the excavation work posture of the shaft.
The straight line SL22 passing through the winch-side end Pw2 of the arc-shaped portion 169b and the rotation center axis O1 of the point sheave 112 and the tangent TL2 of the arc-shaped portion 169b at the end Pk2 on the keriba side of the arc-shaped portion 169b A covering portion C21 that covers the radial outer side of the point sheave 112 in the intervening range is provided. As a result, the scattering of muddy water can be further suppressed.

(5) The cover 161A of the shatterproof device 160A of the guide sheave 111 on the winch side is from the main winding rope 16a wound around the point sheave 112 on the keriba side when the main winding rope 16a is wound by the main winding winch 10a. Cover part C10 as a receiving part to receive flying muddy water
a and C10b are provided. As a result, even when there is a gap between the cover 161A of the shatterproof device 160A and the cover 161B of the shatterproof device 160B, it is possible to prevent muddy water from scattering from the gap.

(6) The cover 161A is rotatably attached to the holding member 162 having one end close to the point sheave 112 attached to the shaft 181 of the guide sheave 111, and the other end far from the point sheave 112 is attached to and detached from the tip end side of the boom 7. It is attached freely. Cover 1
One end of the 61B close to the guide sheave 111 is rotatably attached to the holding member 162 attached to the shaft 182 of the point sheave 112, and the other end far from the guide sheave 111 is detachably attached to the tip end side of the boom 7. ing. Thereby, the attachment workability and the removal workability of the main winding rope 16a with respect to the guide sheave 111 and the point sheave 112 can be improved.

(7) The cover 161A is attached to a fixing bar 163 whose other end far from the point sheave 112 is a rod-shaped member for preventing the rope from coming off of the guide sheave 111. Similarly, the cover 161B is attached to a fixing bar 163 whose other end far from the guide sheave 111 is a rod-shaped member for preventing the rope from coming off of the point sheave 112. As a result, it is not necessary to provide a dedicated fixing bar separately from the rod-shaped member for preventing the rope from coming off. According to the present embodiment, since the fixing bar 163 can serve as both a rope stopper and a cover 161 fixed to the boom 7, the number of parts and the cost can be reduced.

(8) A covering portion C12 extending from the radial outer point P12 of the winch-side end portion Pw1 of the arc-shaped portion 169a toward the main winding winch 10a is provided. As a result, the scattering of muddy water can be suppressed as compared with the case where the covering portion C12 is not provided.

In the vicinity of the end of the arcuate portion 169a of the main winding rope 16a wound around the guide sheave 111 on the main winding winch 10a side, the amount of muddy water adhering to the main winding rope 16a is reduced. The amount of muddy water that flies from is small compared to other parts. Further, even if it flies, it flies along the main winding rope 16a, so that it may adhere to the boom 7 but is unlikely to adhere to the surrounding structures. However, as described above, by providing the covering portion C12 having a certain length, it is possible to reduce the adhesion of muddy water to the surrounding structure 90 as compared with the case where the covering portion C12 is not provided.

The following modifications are also within the scope of the present invention, and one or more of the modifications can be combined with the above-described embodiment.
(Modification example 1)
In the above-described embodiment, an example has been described in which the scattering prevention device 160A for the guide sheave and the scattering prevention device 160B for the point sheave are separated and the scattering prevention device 160 is individually provided for each sheave 110. , The present invention is not limited to this. For example, FIG.
As shown in a), a single cover 161 covering both the guide sheave 111 and the point sheave 112 may be provided.

(Modification 2)
In the above-described embodiment, an example in which the cover 161 is rotatably held by the holding member 162 has been described, but the present invention is not limited thereto. As shown in FIG. 11 (b)
The cover 161 may be non-rotatably held by the fixing bar 163.

(Modification 3)
In the above-described embodiment, an example in which the guide sheave 111 and the point sheave 112 are provided at the tip of the boom 7 has been described, but the present invention is not limited thereto. Boom 7
Sheave 11 around which the main winding rope 16a provided on the tip side of the keliba 14 and supporting the keriba 14 is wound.
The number of 0s may be one as shown in FIG. 11B, or may be three or more (not shown).

(Modification example 4)
In the above-described embodiment, an example in which the fixing bar 163 is a rod-shaped member having a function of preventing the rope from coming off has been described, but the present invention is not limited thereto. The cover 161 may be fixed to the boom 7 by a dedicated fixing bar 163 separate from the rod-shaped member for preventing the rope from coming off.

Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other aspects conceivable within the scope of the technical idea of the present invention are also included within the scope of the present invention.

1 Earth drill, 2 Lower running body (body), 4 Upper turning body (body), 7 Boom, 1
0a Main winding winch (winch), 14 keriba, 15 excavation bucket (excavator), 1
6a Main winding rope (rope), 95 muddy water, 110 sheave, 111 guide sheave (winch side sheave), 112 point sheave (keriba side sheave), 160 shatterproof device, 161 cover, 162 holding member, 163 fixing bar ( (Rope-shaped member for preventing rope from coming off)) 164 Shielding plate, 169a Arc-shaped part, 169b Arc-shaped part, 181 shaft, 182 shaft, C11 covering part, C21 covering part

Claims (5)

A self-propelled vehicle body equipped with a winch, a boom whose base end side is attached to the vehicle body, one or more sheaves rotatably provided on the tip side of the boom, and a rope wound around the winch. In an earth drill including a kelly bar rotatably suspended from the rope via the sheave and an excavator attached to the lower end side of the kelly bar.
An earth drill provided with a shatterproof device provided with a cover that receives muddy water scattered by centrifugal force from the rope wound around the sheave when the rope is wound by the winch. In the earth drill according to claim 1,
The cover is a winch-side end of an arcuate portion of the rope that contacts the sheave.
And a covering portion that covers the radial outer side of the sheave in the range between the straight line passing through the rotation center axis of the sheave and the tangent line of the arcuate portion at the end of the arc-shaped portion on the Keriba side. An earth drill characterized by being. In the earth drill according to claim 2,
The cover is an earth drill characterized in that one end side is rotatably attached to a holding member attached to the shaft of the sheave, and the other end side is detachably attached to the tip end side of the boom. In the earth drill according to claim 3,
The cover is an earth drill characterized in that the other end side is attached to a rod-shaped member for preventing the rope from coming off the sheave. In the earth drill according to claim 1,
The one or more sheaves provided on the tip end side of the boom include the winch side sheave and the keriba side sheave.
The shatterproof device is provided on each of the winch-side sheave and the keriba-side sheave.
The cover of the sheave shatterproof device on the winch side is provided with a receiving portion for receiving muddy water flying from the rope wound around the sheave on the keriba side when the rope is wound by the winch. Characteristic earth drill.

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