JP2832436B2 - Prevention device for scattering of muddy water etc. in excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a device for preventing scattering of muddy water or the like in an excavator,
More particularly, the present invention relates to a device for preventing scattering of muddy water and the like adhering around a swivel joint at the top of the kelly bar when the kelly bar is pulled up in an excavator.

(Description of the Related Art) As a conventional device for preventing scattering of muddy water and the like in an excavator for preventing the scattering of muddy water that adheres and stays around a swivel joint that suspends the top of the kerry bar at the time of pulling up the conventional keliver, there is, for example, J. There is one described in JP-A-63-12223.

This device suspends a telescopic kelly bar via a swivel joint on a wire rope hanging from a sheave at the top of a telescopic boom of a crane truck, and lowers the wire rope sequentially by rewinding a winch on the crane truck. ,
The telescopic kelly bar is rotated through the kelly bar by a motor provided on a front arm on the crane truck on the crane truck, and a bucket with a cutting blade at the lower end of the innermost kelly bar excavates and drills a target location, The excavated soil and the like are stored in the bucket, and then the wire rope is wound up by a winch to pull up the innermost keriba and the bucket with a digging blade, and the inner keriba adjacent to the innermost keriba, the outer keriba according to the rise, In the excavator, the outermost kelly bar is sequentially pulled up to the ground by contact with the lower end of the innermost kelly bar, and the soil and the like contained in the bucket with the excavation blade are discharged to a packing box of a dump truck. By providing a cylindrical cover on the top of the stake, pulling the kerry bar and the bucket with the digging blade to the ground using a wire rope At the end of the evacuation process, the rotation of the swivel joint that rotates by twisting due to a change in the tension of the wire rope prevents bentonite solution or muddy water that adheres and stays around the swivel joint from scattering around the excavator. is there.

In addition, the actual application distributed in Japan before the filing of this application
No. 167883 and JP-A-59-167884, in a solid hole excavator having a telescoping type kelly bar in which an inner kelly bar is supported by a wire rope via a joint bracket, the upper end of the outer kelly bar has a swivel joint bracket. A bracket that surrounds and is detachably attached to a splittable cylindrical cover, and a bracket for fixing and supporting, via pins, a pair of metal fittings having a plurality of brush-implanted surfaces on the upper inner wall of the cover is attached. The height of the cover is set to be higher than the position of the joint fitting when it falls down the Keriba, and the brush is placed so as to abut the wire rope and cover the periphery thereof, and by inserting and removing the pin, Rotating the metal fitting to prevent the brush attached to another surface of the metal fitting from coming into contact with a wire rope, thereby preventing splashing of muddy water from a solid hole excavator. And a tubular cover that surrounds the joint fitting at the upper end of the outer keriba and that is detachably attached to a cylindrical cover that is configured to be vertically divisible, and that has an inner peripheral surface that has an elastic material such as a brush. A metal fitting is provided, and the metal fitting and the upper inner wall of the cover are attached by a connecting tool such as a pair of ropes having a sufficient length, and the height of the cover is set to a dimension higher than the position of the joint metal when the Keliva is folded. A description is given of a case in which a wire rope for suspending and supporting a keriba is passed through the center of the metal fitting and the periphery thereof is covered with the elastic material.

However, when the telescopic type kelever is pulled up to the ground, the swivel joint connected to the top of the innermost keliever is positioned at the outermost position. Because it is located inside the cylindrical cover provided at the top of the kelly bar and covered, the centrifugal force based on the rotation of the swivel joint due to the twisting of the wire rope at the end of pulling up the telescopic kelly bar causes Although the scattering of attached muddy water and the like can be prevented by the cylindrical cover, even in the final stage of the pulling up of the telescopic Keriba to the ground, the swivel joint continuously provided on the top of the innermost Keriva is the most suitable. It will be located inside the tubular cover at the top of the outer keliever and therefore the switch The operator cannot directly see the swivel joint at the top of the innermost kelly bar until the end of the pull joint is pulled up beyond the inner position of the cylindrical cover at the top of the outermost kelly bar to the raised position reaching the upper side. However, the pulling operation by the winch has to be performed depending on the feeling of the operator.

For this reason, the time of deceleration of the hoisting speed of the wire rope suspending the telescopic kelly bar is delayed, and an impact sound is generated due to a collision between the lower end portion of the innermost kelly bar and the lower end of the outer kelly bar due to excessive winding of the wire rope. become. To reliably prevent this, the winding speed of the wire rope at the end of pulling up the telescopic Keliva must be decelerated earlier.
As a result, there has been a problem that the low-speed operation time of the winch, and hence the pull-up time of the telescopic keriba, becomes longer, and the work efficiency is reduced.

Also, assuming that this cylindrical cover is provided in a single-stage type kelly bar, in this case, the entire swivel joint including the pin attachment portion to the top of the kelly bar will be located in the cylindrical cover. Therefore, the swivel joint cannot substantially fall down around the pin attachment portion with respect to the top of the kelly bar, and therefore, when the wire rope is fed out and the wire rope is further fed out after the bucket at the bottom of the keliva has settled down, the same will occur. There has been a problem that the wire rope is loosened and the winch drum is turbulently wound (cage state).

Furthermore, when the telescoping keriba is pulled up and the sediment etc. in the bucket is discharged to the cargo box of the truck, etc., and used as a pile for the sediment etc. after the discharge, the inclination angle of the swivel joint with respect to the innermost keriba is small, and Since the tilting state of the swivel joint cannot be visually recognized, the leveling state cannot be immediately started by the bucket with the excavated blade, and the state of the swirl joint cannot be started immediately. State) may occur.

Further, Japanese Utility Model Application Laid-Open No. 59-167883 and Japanese Utility Model Application
In the muddy water splash prevention device of a hard hole excavator described in 167884 JP, by providing a cylindrical cover having a brush that can be divided at the top of the outermost keriba and has a brush in contact with a wire rope at the upper inside, Due to the rotation of the swivel joint based on the untwisting of the wire rope that occurs when the bucket with the excavation blade at the lower end of the kelly bar pulled up by the rope is placed on the ground, it adheres around the swivel joint,
In addition to preventing the staying muddy water and the like from being scattered by the cylindrical cover, muddy water and the like adhering to the wire rope can flow downward by contact with the brush, but in this case, the swivel joint is the most suitable. Since it was configured not to be pulled up beyond the tubular cover provided on the top of the outer kelly bar, the swivel joint of the kelly bar was located in the tubular cover until the kelly bar reached the final withdrawn state. It is not possible to visually recognize the outside thereof, and as far as this point is concerned, it is the same as the known example shown above, in that the state of the end of pulling up of the keriba cannot be directly seen. The problem remains unresolved.

The present invention has been made in view of such a problem in the conventional example, and suspends a swivel joint pinned to the top of the keriba with a wire rope, and attaches the swivel joint to a non-rotating portion or a rotating portion of the swivel joint. By providing a cylindrical cover having a height exceeding the top of the swivel joint and preventing scattering of muddy water or the like adhering and staying around the swivel joint via a spacer with a drain hole downward, The wire rope suspends the swivel joint pinned to the top of the innermost keliever of the telescopic keliever, and the non-rotating part or the rotating part of the swivel joint has a height exceeding the top of the swivel joint. , The outer diameter of which is smaller than the inner diameter of the adjacent outer keriba, adheres and stays around the swivel joint. By providing a cylindrical cover for preventing scattering of muddy water and the like via a spacer with a drain hole downward, it is intended to provide a device for preventing scattering of muddy water and the like in an excavator having no such problems. is there.

(Means for Solving the Problems) In order to solve the problems of the conventional example as described above, the present invention suspends a swivel joint pinned to the top of the keriba with a wire rope and rotates the swivel joint without rotating. The part or the rotating part has a height exceeding the top of the swivel joint, and a cylindrical cover for preventing the scattering of muddy water that adheres and stays around the swivel joint through a spacer with a drain hole downward. It is a device for preventing scattering of muddy water etc. in the provided excavator, and a wire rope suspends a swivel joint pinned to the top of the innermost keriba of the telescopic keriba,
The non-rotating part or the rotating part of the swivel joint has a height exceeding the top of the swivel joint, the outer diameter of which is smaller than the inner diameter of the adjacent outer keriba, and adheres and stays around the swivel joint, such as muddy water. A cylindrical cover for preventing scattering is provided via a spacer having a drain hole downward.

(Operation) Since the present invention has the above-described configuration, the same drilling as the ordinary excavator and the excavation housed in the bucket with the excavation blade are performed by winding and lowering the wire rope and rotating the kelever. Muddy water that adheres to and stays on the non-rotating or rotating part of the swivel joint through a spacer with a drain hole downward, in addition to the one that discharges earth and sand etc. to the ground by pulling up the keriba By providing a cylindrical cover whose outer diameter is smaller than the inner diameter of the outer kelly bar of the kelly bar, rotation of the swivel joint based on a decrease in the tension of the wire rope at the end of pulling up the kelly bar prevents the scattering of the swivel joint. Even if the swivel joint, especially muddy water that adheres and stays around the concave portion, tries to scatter, the swivel joint has a drain hole. Is blocked by a cylindrical cover provided through
When flowing down along the inside of the tubular cover, it flows down to the swivel joint through the drain hole of the spacer, and even when the tubular cover rises upward beyond the top of the outer keriba, the swivel joint There is no danger that muddy water that adheres or stays will scatter outside the tubular cover.

In addition, if this swivel joint with a cylindrical cover is provided by being pinned to the top of the single-stage kelly bar, the bottom of the bucket with the excavating blade below the single-stage kelly bar is inclined by the inclination of the swivel joint pinned to the top. Or after sighting of lodging,
Prior to the occurrence of turbulence in the winch drum due to overwinding of the wire rope, the end of pulling up of the keriba is directly confirmed by visually recognizing a cylindrical arm provided outside the swivel joint, and the winch is stopped based thereon. Further, if this swivel joint with a tubular cover is pinned to the top of the innermost kelly bar of the telescopic kelly bar, the end of pulling up of the telescopic kelly bar can be terminated at the outermost of the cylindrical cover at the top of the innermost kelly bar. After the operator directly visually recognizes the upward projection from the top of the kelly bar, the hoisting speed of the wire rope is reduced and the excavated sediment of the bucket is removed when the excavated sediment is piled up by the telescopic kelly bar. The winch drum due to overwinding of the wire rope by visually recognizing the tubular cover on the top of the innermost Keliva at the bottom of the mountain To stop the winch before turbulence winding occurs.

Furthermore, since the cylindrical cover was directly attached to the non-rotating part or the rotating part of the swivel joint via the spacer with a drain hole downward, when pulling up the kelly bar with a wire rope, the kelly bar, the swivel joint, Most of the muddy water that adheres and stays on the cylindrical cover and the like flows down along each.However, there is muddy water and the like that adheres and stays on the non-rotating part and the rotating part of the swivel joint, particularly, its concave part and the like. Also, when the swivel joint rotates based on the relaxation of the tension of the wire rope and the muddy water or the like that adheres and stays inside tries to fly due to the centrifugal force, it flows down along the inner wall of the cylindrical cover, and temporarily. The non-rotating part of the swivel joint is also raised when it is pulled over the top of the outer keriba. When muddy water or the like adhering to and staying on the rotating member tries to scatter due to the rotation of the swivel joint, it is blocked in the same manner as described above by the cylindrical cover disposed outside thereof, and flows downward from the drain hole of the spacer. I do.

(Embodiment) Hereinafter, first to third embodiments of a device for preventing scattering of muddy water and the like in an excavator according to the present invention will be described with reference to the attached FIGS. 1 to 8.

First Embodiment First, FIGS. 1 to 5 schematically show a first embodiment of a device for preventing scattering of muddy water or the like in an excavator according to the present invention, and FIG. 1 shows the first embodiment. Vertical sectional view of the main part of the second
FIG. 3 is a plan view of the cylindrical cover and the spacer portion, FIG. 3 is an enlarged cross-sectional view of a part thereof, FIG. 4 is a side view of the telescopic Kelly bar in an extended state, and FIG. It is a side view in the state where the scattering prevention device, such as muddy water in an excavator, was hung with the wire rope from the sheave of the telescopic boom of a crane.

1 to 5, 1 is a crane truck, 2 is a telescopic boom, 3 is an undulating cylinder, 4 is a wire rope, 5
Is a winch, 6 is a sheave at the top of the innermost boom of the telescopic boom 2, 7 and 8 are swing links, 9 is a fixing cylinder, 10
Is a bearing frame of the Kelly driver 121, 12 is a rotary drive motor of the Kelly driver 11, 15 is a telescopic Kelly bar, 16 to
20 is the first (outermost) to fifth (innermost) keriba, 21
Is a swivel joint. The swivel joint 21 includes a connecting member 22 having a pin 23 rotatably mounted on the top of the innermost kelever 20 and a bearing portion 24 fixed to an upper portion of the connecting member 22 (FIG. 1). A rotating body 26 rotatably supported by the thrust bearing and the needle bearing 25 on the bearing portion 24, a recess 26A is formed at the top of the rotating body 26, and the end of the wire rope 4 is formed in the recess 26A. The ring-shaped part formed in the part is inserted, and the pin 29 is attached to be able to swing. Reference numeral 28 denotes a nut for inserting and fixing the shaft 27 of the rotating body 26 to the thrust of the bearing 24 and the needle bearing 25.

Reference numeral 31 denotes a cylindrical cover that covers the swivel joint 21. The cylindrical cover 31 is integrally mounted on the outer periphery of a bearing portion (non-rotating portion) 24 of the swivel joint 21 via a spacer 32 with a drain hole 33, The upper part (FIG. 1) of this cylindrical cover 31
The rotating body 26 and the lower end of the wire rope 4 are covered around the pin 29 at the top of the rotating body 26, and receive the muddy water and the like flowing out and scattered from the recess 26A by the rotation of the rotating part 26 of the swivel joint 21. (FIG. 1 illustrates an example in which the height is substantially the same as the height of the portion where the concave portion 26A of the rotating portion 26 is formed, and is formed so as to extend upward from the top thereof.) The swivel joint 21 extends downward within a range that does not hinder refraction of the pin 23 at the top of the innermost kelly bar 20 of the connecting portion 22 of the swivel joint 21.

The lower portion of the cylindrical cover 31 is connected to the connecting portion 22 and the bearing portion 24.
With the length up to the set screw portion, regardless of whether the cylindrical cover 31 is mounted, the assembling work of both can be performed in the same manner as in the conventional kelly bar.

Reference numeral 35 denotes a bucket with an excavating blade having a pin 36 attached to a lower end of the innermost kelly bar 20, and 37 denotes a first kelly bar 16 to a fourth kelly bar 19.
The bottom of the fifth kelly bar 20 is provided with an excavating blade, and is arranged between the buckets 35. When the telescopic kelly bar 15 is reduced by raising the fifth (innermost) kelly bar 20, the fourth kelly bar 19 to the first kelly bar 20 are arranged.
16 This is a coil spring that buffers the contact with the lower end.

(Operation of the First Embodiment) First, after moving the crane truck 1 to the destination, the telescopic boom 2 is erected by the hoisting cylinder 3, and the support frame 10 is moved to the telescopic boom 2 via the swing arms 7, 8. It is placed in place just below the sheave 6 at the top and locked in place by a fixing cylinder 9. On the other hand, the end of the wire rope 4 is attached to the rotating body 26 of the swivel joint 21 with a pin 29, and the wire rope 4 is wound up by the winch 5, so that
Is suspended through the Kelly driver 11 on the support frame 10 as shown in FIG.

A bucket 35 with a cutting blade is attached to the lower end of the fifth (innermost) kelly bar 20 with a pin 36, and the bucket 35 with the cutting blade is aligned with the center of the target hole H. The bucket 35 is lowered to the ground or the bottom of the hole H together with the telescopic kelly bar 15, and the first to fifth kelly bars 16 are driven by the motor 12 via the kelly driver 11.
Then, the hole H is excavated and drilled by the bucket 35. Each time soil or the like is stored in the bucket 35 by the perforation, the wire rope 4 is wound up by the winch 5, and first the bucket 35 together with the fifth kelly bar 20, then the fourth kelly bar, and the third, second, and first below. The kelly bars 18, 17, 16 are pulled up in the order shown in FIG. 5, and the sediment and the like in the bucket 35 are discharged to a packing box (not shown) of a truck arranged below the bucket 35. This operation is repeated to excavate and drill a hole H at a required depth. These operations are almost the same as those described in the above-mentioned publication.

In this embodiment, when the bucket 35 with the excavating blade is pulled up to the ground, the spacer 32 with the drain hole 33 around the bearing 24 of the swivel joint with the pin 23 attached to the top of the fifth kelly bar 20.
Before the top of the fifth (innermost) kerry bar 20 reaches the top of the first (outermost) kelly bar 16, the pin 23 is attached to the top thereof. A cylindrical cover 31 around the bearing 24 of the swivel joint 21
Is projected above the top of the first keriba 16,
The driver of the excavator visually recognizes the protrusion of the top of the cylindrical cover 31 so that the telescopic Keriva 15 can be pulled up at the end of lifting.
That is, knowing that the bucket 35 is just before being pulled up from the inside of the perforation H, the winding speed of the wire rope 4 by the winch 5 is reduced, the telescopic kelly bar 15 is pulled up to a required height at a slow speed, and stopped at a predetermined position.

When the telescopic kelly bar 15 is pulled up, the motor 12 stops and the telescopic kelly bar 15 does not rotate (even if the motor continues to rotate, even if it rotates at a low speed).
It flows down to the ground along the inner and outer surfaces of the kelly bar 15 without being scattered, but a large amount of muddy water adheres and stays around the concave portion 26A where the pin 29 is attached between the wire rope 4 and the rotating body 26.
With the return of the wire rope 4 due to the deceleration of the winch 5,
When the rotating portion 26 of the swivel joint 21 instantaneously rotates at high speed, a large amount of bentonite solution or mud adhering and staying around the concave portion 26A of the rotating body 26 tends to scatter in the radial direction, but the bearing portion of the swivel joint 21 After coming into contact with the inside of the tubular cover 31 provided on the outer periphery of the spacer 24 via the spacer 32 and descending, it falls to the ground through the drain hole 33 of the spacer 32.

In the above description, an example has been described in which the cylindrical cover 31 is provided outside the periphery of the bearing portion 24 via the spacer 32 with the drain hole 33, but this cylindrical cover 31 is provided on the outer periphery of the connecting portion 22. (In this case, however, the lower portion of the cylindrical cover 31 is connected to the bearing portion 24, in particular, to the connecting portion 22 of the second kelly bar 20, the top of which is connected to the pin 23 by the same pin. Needless to say, the length should not interfere with the rotation around 23). In this case, the operation is almost the same as described above.

(Second Embodiment) Next, a second embodiment of a device for preventing scattering of muddy water or the like in an excavator according to the present invention will be described with reference to FIG. Parts common to those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same names and the same reference numerals.

This second embodiment is similar to the fifth kelly bar of the telescopic kelly bar 15.
20 A pin 23 is attached to the connecting member 22 so that it can be bent at the top,
The shaft 27 of the rotating body 26 is rotatably inserted into the thrust and the needle bearing 25, and the nut 28 is fixed. The rotating body 26 is attached to the end of the wire rope 4 with a pin 29. Spacer 42 with drain hole 43 around rotating body 26
A relatively large amount of bentonite solution or muddy water which adheres to and stays in the recesses 26A where the rotator 26 and the wire 4 are attached to the pins 29 is provided by the wire rope 4
The instantaneous rapid rotation of the rotating body 26 due to the untwisting at the end of the winding of the
And let it fall into the drain hole 43 of the spacer 42.
(The structure itself of the spacer 42 with the drain hole 43 is
(Same as spacer 22 with 23) and fall to the ground.

In this embodiment, the cylindrical cover 41 rotates simultaneously with the rotating body 26 of the swivel joint 41, but the inside and outside of the cylindrical cover 41, particularly, the outside thereof is formed in a smooth cylindrical shape. When the swivel joint 21 does not rotate before the swivel joint 21 protrudes upward from the top of the first kelly bar 16 with the raising of the telescopic kelly bar 15, that is, before the winding speed of the wire rope 4 is reduced, the swivel of the swivel Before the rotating portion 26 of the joint 21 rotates, most of the muddy water or the like adhering to the smooth inner and outer surfaces of the cylindrical cover 41 flows down along the cylindrical surface thereof. Are rarely scattered from the outer periphery.

(Third Embodiment) Next, a third embodiment of a device for preventing scattering of muddy water or the like in an excavator according to the present invention will be described with reference to FIG. In addition, the first type shown in FIGS.
The same names and reference numerals are used for portions corresponding to the second embodiment.

First, the structure of the swivel joint 51 of this embodiment is substantially the same as that of the swivel joint 21 shown in the first embodiment (see FIG. 1). This embodiment is the same as the second embodiment in that a cylindrical cover 61 is provided around a non-rotating portion of a swivel joint 51 via a spacer 62 having a drain hole downward.

52 is a connecting portion (non-rotating portion) fixed to the top of the fifth kelly bar 20 by a pin 54, 53 is its shaft portion, and this shaft 53 portion is rotatably inserted into the ball and thrust bearing 56 portion of the rotating body 55, 57 Stopped. Further, a suspending portion 58 is screwed and fixed to the upper portion of the rotating body 55. 58A is an insertion recess at the end of the wire rope 4 formed in the connecting portion 58, and 59 is a suspending portion 58 and the wire rope 4
Lock pin with the end, 61 is a drain hole on the upper outside of the connecting part 52
A cylindrical cover fixed via a spacer 62 with 63 (the structure itself of the spacer 62 with the drain hole 63 is the same as the spacer 22 with the drain hole 23).
55 and the lower part of the wire rope 4 are covered. The lower part of the cylindrical cover 61 is connected to the connecting part 52 with the top of the fifth kelly bar 20.
Is extended downward as long as it does not hinder the lodging of the boat.

In the operation of the present embodiment, the swivel joint
When the rotating body 55 of the rotating member 51 rotates, and the end of the wire rope 4 is fixed around the concave portion 58A of the suspending portion 58 that suspends the wire 59 with the pin 59, the residual muddy water and the like are scattered, the cylindrical cover
In addition to falling down by contacting the inside of 61 and dropping to the ground via the drain hole 63 of the spacer 62, the same operation as in the second embodiment is performed.

Fourth Embodiment Next, a fourth embodiment of a muddy water scattering prevention apparatus for an excavator according to the present invention will be described with reference to FIG. Parts common to the first, second and third embodiments shown in FIGS. 1 to 7 are omitted from illustration, and corresponding parts are denoted by the same reference numerals and names.

FIG. 8 shows a device for preventing scattering of muddy water or the like in an excavator according to the present invention (see a third embodiment shown in FIG. 7).
Between the connecting portion 52 of the swivel joint 51 and the cylindrical cover 71, a plurality of (four in the figure) fan-shaped pieces (spacers) 72, 72,.
It is a top view of an important section of a swivel joint with a cylindrical cover of a fourth embodiment of the present invention in which is disposed.

In the fourth embodiment, a plurality of thin fan-shaped pieces (spacers) 72 are used instead of the ring-shaped spacers 62 with water drain holes 63 downward in the third embodiment shown in FIG. ,
72 are arranged on the concentric circle with a space W between the connecting portion 52 of the swivel joint 51 (see FIG. 7) and the cylindrical body 71, and the space W is Corresponds to the downward drain hole in the example.

In this embodiment, a gap 73 formed by the outer peripheral surface of the connecting portion 52 of the swivel joint 51 (see FIG. 7), the inner peripheral surface of the cylindrical cover 71, and the adjacent thin fan-shaped pieces 72, 72 is formed by the spacer 62. Has a function corresponding to the downward drain hole 63. By changing the size of the interval W between the thin-walled fan-shaped pieces 72, it is possible to select a wide range of materials having different drainage properties such as muddy water falling into contact with the inside of the cylindrical cover 71.

The spacer consisting of the thin fan-shaped pieces 72 shown in FIG. 8 is the same as the spacer 32 of the first, second and third embodiments.
It goes without saying that the same can be used in place of 42 and 62.

(Modification) Also, in the above description, the swivel joint 21 is pinned on the top of the fifth (innermost) kelly bar 20 of the telescopic kelly bar 15.
Although the example of mounting is described above, the present invention attaches pins 23 and 54 to the top of a so-called single-stage type kelly bar having only one kelly bar (for example, only the fifth kelly bar 20 in FIG. 4). In this case, too, the swivel joints 21 and 51 are provided with spacers 32, 42 and 62 with drain holes 33, 43 and 63, or a thin sector piece having an interval W.
By arranging the tubular covers 31, 41, 61 via the 72, 72, the same effect of preventing scattering of muddy water and the like as described above is obtained.

In addition, when the swivel joint with the tubular cover according to the present invention is pinned to the top of a single-stage Keriba, the Keriva descends by rewinding the wire rope,
When the bucket at the lower end has landed, the swivel joint with the cylindrical cover at the top falls down (inclined) with respect to the top of the fifth kerry bar, and it is possible to know the bottom of the bucket by visually confirming the fall-down state. Because you can do it, you do not notice the bottom of the bucket,
The occurrence of turbulent winding (cage state) on the winch drum is prevented.

(Effects of the Invention) Since the present invention has the above-described configuration and operates, the following effects can be obtained.

(1) Since the swivel joint is provided with a cylindrical cover via a spacer having a drain hole downward, rotation of the swivel joint at the end of pulling up of the keriba causes the swivel joint, particularly its rotating part, to be connected to the wire rope. It is possible to prevent the bentonite solution or muddy water that adheres to and stays in the concave portion such as the connecting portion and scatters to the outside.

(2) Since a spacer with a drain hole is provided downward between the swivel joint and the cylindrical cover, muddy water that adheres and stays between the innermost kelly bar, the swivel joint, the cylindrical cover, etc. while the innermost kelly bar is rising. After flowing down along the inside of the cylindrical cover, it flows down through the drain hole of the spacer located at the lower part, and despite the installation of the cylindrical cover around the swivel joint, around the same swivel joint There is no possibility that the bentonite solution or muddy water will stay excessively.

(3) Most of muddy water or the like adhering to the inside and outside of the tubular cover provided on the swivel joint is formed along the inside tubular surface of the tubular cover before the end of the rise of the keleba and before the winding speed of the wire rope is reduced. Since it flows down downward, even when the cylindrical cover is provided on the rotating body above the swivel joint,
There is no danger of muddy water splashing from the outer periphery of the cylindrical cover.

(4) Since the swivel joint is provided directly with the tubular cover, the swivel joint can be laid down on the top of the kelly bar. Is stopped, thereby preventing occurrence of turbulence on the winch drum.

(5) Since a cylindrical cover is provided around the swivel joint via a spacer with a drain hole downward, for example,
The end of pulling up of the telescopic keriba can be confirmed by the driver's direct visual observation that the cylindrical cover projects from the top of the outermost keriba, and the deceleration start time of the hoisting speed of the winch that pulls up the telescopic keriba is determined. It is possible to make an appropriate choice, and thus to quickly raise and lower the telescopic keriba only at the end of the hoisting operation, thereby stopping the telescopic keriba efficiently.

(6) Applicable to hoisting and lowering of wire rope and rotation of the keliver, and excavation similar to that of a normal excavator, and excavation of soil and the like housed in a bucket with an excavating blade discharged to the ground by pulling up the keliver It is possible to further prevent the non-rotating portion or the rotating portion of the swivel joint from being attached to the non-rotating portion or the rotating portion of the swivel joint via a spacer having a drain hole downward, and to prevent scattering of muddy water or the like that accumulates. By providing the cover, most of the muddy water and the like adhering to the inside and outside of the cylindrical cover flows down along the inside surface of the tubular cover in the non-rotating state of the swivel joint while pulling up the kelly bar by winding the wire rope. However, muddy water or the like that adheres to the inside of the cover and flows downwards decreases the amount of drainage of the spacers and flows further downwards. When the swivel joint rotates based on the decrease in the tension of the wire rope at the end of pulling, muddy water or the like that adheres and stays around the non-rotating portion or the rotating portion of the swivel joint scatters and contacts the inside of the cylindrical cover. By flowing downward, and flowing downward through the drain hole of the spacer located at the lower part, even when the cylindrical cover rises and descends beyond the top of the outer keriba, it moves around the swivel joint. It is possible to prevent the muddy water that adheres and stays from flying outside the cylindrical cover.

(7) In the case where the cylindrical cover according to the present invention moves up and down over the top of the outer kelly bar by winding up the wire rope, first, the swivel joint portion pinned to the top of the innermost kelly bar is used as the swivel joint. While ascending in the outermost kelly bar of the kelly bar, muddy water and the like adhering around the outside of the cylindrical cover generally flow down along the outer wall surface and adhere to the inside of the cylindrical cover and around the swivel joint. Muddy water also flows down through the gap between the inside of the cylindrical cover and the swivel joint, and flows down through the drainage hole of the spacer. When the heat is dissipated by the centrifugal force due to the rotation of the cylinder, it is blocked by the inner wall of the cylindrical cover and flows down. The water flows down through the drain hole of the pacer and is prevented from scattering outside the cylindrical cover.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of an apparatus for preventing scattering of muddy water or the like in an excavator according to the present invention. FIG. 1 is a longitudinal sectional view of a main part of the first embodiment, and FIG. FIG. 3 is an enlarged cross-sectional view of a part of the part, FIG. 4 is a side explanatory view showing a state where the telescopic kelly bar is extended,
FIG. 5 is a side view showing a state in which a device for preventing scattering of muddy water or the like in the telescopic excavator is suspended from a sheave of a telescopic boom of a crane by a wire rope. FIGS. 6 and 7 show excavations according to the present invention. And FIG. 8 is a plan view of an embodiment in which a spacer (spacer) is arranged between a fan-shaped piece and a cylindrical cover connecting portion of the second and third embodiments of the apparatus for preventing scattering of muddy water or the like in a machine. It is. (Name of code) 1 ... Crane truck 2 ... Expansion boom 3 ... Undulating cylinder 4 ... Wire rope 5 ... Winch 6 ... Sheave 7,8 ... Swing arm 9 ... Fixing cylinder 10 ... Bearing frame 15 Telescopic Keliva 16 First (outermost) Keriba 17-19 Second to fourth Keriva 20 Fifth (innermost) Keriva 21, 41, 51 Swivel joint 22, 52 Connecting part (non-rotating part) 23, 29, 36, 54, 59 Pin 24 Bearing part (non-rotating part) 25 Bearing 26, 55 Rotating body 26A Rotating body 26 Recess 28… Nut 31, 41, 61… Cylindrical cover 32, 42… Spacer 33, 43… Drain hole 35… Bucket 58… Hanging part 72… Sector piece (spacer) 73… Gap ( Drain hole)

Claims (2)

(57) [Claims] 1. A swivel joint which is pinned to a top of a keriba with a wire rope is suspended, and a non-rotating portion or a rotating portion of the swivel joint has a height exceeding the top of the swivel joint, and An apparatus for preventing scattering of muddy water or the like in an excavator, wherein a cylindrical cover for preventing scattering of muddy water or the like adhering and staying around a joint is provided through a spacer having a drain hole downward. 2. A wire rope suspends a swivel joint pinned to the top of an innermost kelever of a telescopic keliver, and a non-rotating or rotating part of the swivel joint has a height exceeding the top of the swivel joint. The outer diameter is smaller than the inner diameter of the adjacent outer kelly bar, and a cylindrical cover is provided through a spacer with a drain hole downward to prevent scattering of muddy water and the like attached and retained around the swivel joint. A device for preventing scattering of muddy water and the like in an excavator.