JP3294063B2 - Bucket chain drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket chain excavator used for excavating and handling piled bulk loads.

[0002]

2. Description of the Related Art Bulk loads and the like loaded in the hold of a carrier ship are unloaded by an unloader equipped with a bucket chain excavator. FIG. 9 is a side view showing a state of a conventional bucket chain excavator used for excavation and cargo handling of such bulk cargo during a normal cargo handling operation, and FIG. 10 is a bottom dredging operation of the bucket chain excavator shown in FIG. FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 10.

As shown in FIG. 9, an upper vertical frame 1a and a lower vertical frame 1 having an upper end connected to a lower end of a bucket elevator column 30 via a shaft 31 at the lower end.
b, and a horizontal frame 2 connected to the lower end of the vertical frame 1 (ie, the lower end of the lower vertical frame 1b) via a shaft 32, to form an L-shaped frame. The upper vertical frame 1a and the lower vertical frame 1b are connected by chain tensioning means 33, and the lower vertical frame 1b expands and contracts by the driving of the chain tensioning means 33.

A vertical frame tilting means 34 is connected between the lower end of the bucket elevator column 30 and the lower end of the upper vertical frame 1a, and connects the center of the lower vertical frame 1b to the center of the horizontal frame 2. The horizontal frame tilting means 35 is connected between them.

[0005] The lower end of the bucket elevator column 30,
Guide sprockets 36, 37, 38, and 39 are provided at the shafts 31, 32 and the distal end of the horizontal frame 2, respectively, and engage with these guide sprockets 36 to 39 to circulate along the L-shaped frame. Bucket chain 3 is provided. The tension of the bucket chain 3 is adjusted by expanding and contracting the lower vertical frame 1b by driving the chain tensioning means 33.
Is adjusted by tension or relaxation. A number of buckets 4 are supported on the bucket chain 3.

[0009] As shown in FIGS. 9 and 11, guide sprockets 38, 3 are provided on both sides of the horizontal frame 2.
A linear guide rail 42 having an engagement groove having a V-shaped cross section is provided in accordance with the passage line of the lower bucket chain 3 between the guide rails 9. The bucket chain 3 is guided by the guide rail 42 when the guide roller 43 provided on the bucket mounting member 3 a of the bucket chain 3 is engaged.

Therefore, according to the bucket chain excavator having the above structure, the bucket elevator column 30 (not shown) is used.
The bucket chain 3 is circulated in the direction of arrow 44 in FIG. 9 by the drive of the upper drive sprocket, and the bulk load accumulated in the bucket 4 is excavated and transported upward. At this time, when the bulk load is sufficiently accumulated in the hold, the bucket chain 3 is tensioned by the driving of the chain tensioning means 33 as shown by the solid line in FIGS.
The normal cargo handling operation is performed by circulating the bucket chain 3 so as to engage with and move with the bucket chain 2.

On the other hand, when the bulk load becomes small and the depth becomes shallow, the tension of the bucket chain 3 is relaxed by the driving of the chain tensioning means 33, as shown by the one-dot chain line in FIGS. 43 is moved downward from the guide rail 42 so that the bucket chain 3 hangs down between the guide sprockets 39 and 38 by its own weight or the weight of the bucket 4 so that the bucket 4 comes into contact with the bulk load only by its own weight. , And carry out loading operation.

However, in the above-described bucket chain excavator, during normal cargo handling operation, the guide rails 42 are linear, while the bucket chains 3 are tensioned by the driving of the chain tensioning means 33, but their own weight and Since the weight of the bucket 4 tends to hang down and tilt, the friction between the guide roller 43 and the lower edge of the engagement groove of the guide rail 42 causes wear on the lower edge,
Furthermore, when a large excavation reaction force is applied to the bucket 4 from a bulk load in a state where the wear occurs, the guide roller 43 is tilted by the excavation reaction force and the guide roller 43 is moved to the guide rail 42.
The bucket 4 may be deformed or damaged due to climbing on the lower edge or biting.

When the bucket chain 3 is relaxed by the driving of the bucket tensioning means 33 from the normal cargo handling operation state to be converted to the bottom dredge operation state, the guide rollers 43 are used.
Is difficult to release from the guide rails 42 smoothly, and it takes time to convert to the bottom dredging operation state. In order to solve such a problem, the inventors of the present application provide a bucket chain excavator in which a guide rail is devised in a prior application. FIG. 12 is a side view of a principal part showing a state of the bucket chain excavator during normal cargo handling operation, FIG. 13 is a side view showing a state of the bucket chain excavator shown in FIG.
4 is a sectional view taken along line XIV-XIV in FIG.

As shown in FIG. 12, in the bucket chain excavator, a guide rail 52 having a catenary curve is attached to the horizontal frame 2 instead of the linear guide rail 42 (see FIG. 9). As shown in FIG. 14, the guide rail 52 has an upper inclined surface 52a.
An engagement surface with the guide roller 43 is formed by the upper surface 52a and the vertical surface 52b continuing to the lower end of the upper inclined surface 52a. The other configuration of the bucket chain excavator is the same as the configuration of the bucket chain excavator (see FIGS. 9 to 11).

Similarly to the bucket chain excavator, the bucket chain excavator tensions the bucket chain 3 and guides the guide rollers 43 during normal cargo operation, as shown by the solid line in FIGS. While engaging with the engaging surface of the rail 52, during bottom dripping operation,
As shown by the dashed line in FIGS. 13 and 14, the tension of the bucket chain 3 is relaxed, and the guide roller 43 is moved downward from the guide rail 52 so that the bucket chain 3 hangs down between the guide sprockets 38 and 39 by its own weight or the like. To

During normal cargo handling operation, the catenary curve curvature of the guide rail 52 and the sagging curvature of the bucket chain 3 due to the weight of the bucket chain 3 coincide with each other, so that the friction between the guide roller 43 and the guide rail 52 is reduced. As a result, wear can be reduced, and the guide rail 53 can be prevented from running up and biting. Also, when converting from the normal cargo handling operation state to the bottom dredging operation state,
Since the guide roller 43 slides on the vertical surface 52b of the guide rail 52 and moves smoothly downward, the release of the guide roller 43 from the guide rail 52 can be performed smoothly.

[0014]

However, in the latter bucket chain excavator according to the prior art, since the guide rails 52 are curved in a catenary shape downward, the guide rails 52 are relaxed during the operation of loading and unloading the bottom. The vertical distance between the hanging bucket chain 3 and the guide rail 52 is
It is shorter than in the case of a conventional bucket chain excavator having a linear guide rail 42. For this reason, unless the bucket chain 3 is set to a more sufficient hanging state, the bucket 4 collides with the guide rails 52 or the like by pushing up from the floor of the hold due to the vertical movement of the ship, etc., in the case of bottom-loading operation. 52 and the bucket 4 will be damaged. However, if the bucket chain 3 is made to hang down more sufficiently, the hanging curvature of the bucket chain 3 increases, and the length of contact between the bulk load and the bucket 4 becomes too short, and the excavation efficiency of the bulk load by the bucket 4 decreases. Resulting in.

Therefore, in view of the above-mentioned prior art, the present invention has a guide rail having a catenary curve shape, and can efficiently perform excavation and cargo handling work such as bulk cargo without damaging a bucket or the like at the time of bottom dredge cargo handling operation. An object of the present invention is to provide a bucket chain excavator.

[0016]

According to a first aspect of the present invention, a bucket chain circulating along an L-shaped or inverted T-shaped frame composed of a vertical frame and a horizontal frame, A bucket comprising: a bucket attached to the bucket chain; and a catenary curve guide rail attached to the horizontal frame so as to engage with a guide roller provided on the bucket chain and guide the bucket chain. In the chain excavator, the horizontal frame is provided with an elevating means for elevating and lowering the guide rail.

According to a second configuration, in the first configuration, the guide rail is formed by a plurality of guide rail divided pieces divided in a length direction, and the lifting / lowering means is configured by each of the guide rails. It is characterized in that each of the divided pieces can be moved up and down.

[0018] In a third configuration, in the first or second configuration, the engagement surface of the guide rail with the guide roller is an upper inclined surface, and a vertical surface connected to a lower end of the upper inclined surface. And characterized by the following.

[0019]

According to the first aspect of the present invention, since the guide rail has a catenary curve shape during normal cargo handling operation, the guide rail coincides with the catenary of the bucket chain. As a result, the guide roller smoothly engages the guide rail. At the time of bottom-loading operation, the bucket chain is relaxed and hangs down, and at the same time, the guide rail is raised by the elevating means. Is sufficiently secured.

According to the second configuration of the present invention, in addition to the same operation as the first configuration, since the guide rail is composed of a plurality of guide rail divided pieces, these guide rail divided pieces are respectively By raising / lowering operation by the lifting / lowering means, even if the horizontal frame is telescopic, the guidel can be used as a catenary of the bucket chain during normal cargo handling operation in both the reduced state and the expanded state of the horizontal frame. Can be matched.

According to the third aspect of the present invention, in addition to the same operation as the first or second aspect, the engaging surface of the guide rail is composed of an upper inclined surface and a vertical surface. When the bucket chain is relaxed during the transition from the loading operation state to the bottom-loading operation state, the guide roller slides on the vertical surface of the guide rail to smoothly move down. Also, when the guide rail is composed of a plurality of guide rail divided pieces and the horizontal frame is telescopic, the catenary curve of the guide rail and the catenary of the bucket chain are slightly different, and there is a part where there is no guide rail. Even
The guide roller moves smoothly along the guide rail.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment><Structure> FIG. 1 is a side view showing a state of a bucket chain excavator according to a first embodiment of the present invention during a normal cargo handling operation, and FIG. FIG. 2 (b) is an enlarged view of a portion A in FIG. 2 (a), and FIG. 3 is a side view of a principal part showing a state of the bucket chain excavator shown in FIG. FIG. In the drawings, the same parts as those in the related art (FIGS. 9 to 14) are denoted by the same reference numerals, and overlapping detailed description will be omitted.

In FIG. 1, reference numeral 5 denotes a chain tensioning means provided vertically on the outer surface of the front wall of the bucket elevator column 30, and 6 denotes a guide roller 7 on the bucket elevator column 30 having an upper end connected to the chain tensioning means 5. This is a vertical frame composed of an upper vertical frame 6a provided to be vertically movable through the lower frame 6b and a lower vertical frame 6b connected to the lower end of the upper vertical frame 6a so as to be tiltable forward and backward. An integrated horizontal frame 2 is tiltably connected to a lower end of the lower vertical frame 6 via a shaft 8, and the horizontal frame 2 and the vertical frame 6 form an inverted T-shaped frame. .

Reference numeral 9 denotes a lower vertical frame tilting means connected between the center front surface of the lower vertical frame 6b and the lower front surface of the lower vertical frame 6a, and 10 denotes a center rear surface of the lower vertical frame 6b and the horizontal frame 2. Horizontal frame tilting means connected to the rear of the vehicle.

The bucket chain 3 includes a guide sprocket 11 provided below the bucket elevator column 30,
It engages with guide sprockets 13 and 14 provided at the front and rear ends of the horizontal frame 12 and the horizontal frame 2, and is circulated in the direction of arrow 15 along the inverted T-shaped frame.

As shown in FIGS. 1 and 2, the horizontal frame 2 is provided with two sets of guide rail elevating means 19 and two sets of vertical guides 16 provided on both sides of the horizontal frame. I have. The guide rail lifting / lowering means 19 has its tip connected to the guide rail 18 having a catenary curve shape, and moves up and down the guide rail 18 by expansion and contraction. The vertical guide 16 engages with a movable support frame 17 that supports a guide rail 18, and guides the movable support frame 17 up and down.

As shown in FIG. 2B, the guide rail 18 has an upper inclined surface 18a and a vertical surface 18b connected to the lower end of the upper inclined surface 18a, similarly to the guide rail 52 shown in FIG. It is preferable that an engagement surface with the guide roller 43 is formed.

The vertical guide 16, the movable support frame 17, the catenary curved guide rail 18, and the guide rail elevating means 19 are not limited to the inverted T-shaped frame type bucket chain excavator described above. Also, the present invention can be similarly applied to an L-shaped frame type bucket chain excavator as shown in FIG. Also, the vertical guide 16, the movable support frame 17, and the guide rail elevating means 1
The number and arrangement of 9 are not limited to the above configuration, and may be changed as appropriate.

<Operation / Effect> Therefore, according to the bucket chain excavator of the first embodiment having the above structure, the guide rails 18 are driven by the guide rail lifting / lowering means 19 during normal loading / unloading operation. The unloading operation is performed while the bucket chain 3 is maintained in a tensioned state by driving the chain tensioning means 5 while maintaining the height continuous with the lower peripheral edge. In this state, as shown in FIG. 2, the guide roller 43 moves while being guided by the upper inclined surface 18a and the lower vertical surface 18b of the guide rail 18, and from the bucket 4 at this time to the guide rail 18 via the guide roller 43. Such a horizontal force is received by the movable support frame, further transmitted to the horizontal frame 2 via the vertical guide 16, and supported by the horizontal frame 2.

At this time, the catenary of the bucket chain 3 and the catenary curve of the guide rail 18 substantially coincide with each other, and the guide roller 43 moves smoothly along the guide rail 18.
The wear between the guide rails 18 due to the friction between the guide rails 18 and the rising and biting of the guide rollers 43 on the edges of the guide rails 18 are eliminated and no longer occur.

During the bottom-loading operation, as shown in FIGS. 2 and 3, the bucket chain 3 is relaxed by driving the chain tensioning means 5, and the guide sprocket 1 is moved.
Since the bucket chain 3 is hung down by its own weight or the like between the positions 3 and 14 and the guide rail 18 is raised to a height allowed by the drive of the guide rail elevating means 19, the bucket chain 3 does not need to be hung down excessively. Between the chain 3 and the guide rail 18,
A sufficient vertical distance can be ensured to prevent the guide rails 18 and the like from being damaged by pushing up of the bucket 4 due to vertical movement of the boat. Therefore, since the excavation can be performed with the contact length between the bucket 4 and the bulk load sufficiently long, the excavation and cargo handling work at the time of the bottom dredge operation can be efficiently performed. When the bucket chain 3 is relaxed, the guide roller 43 is moved to the vertical surface 18 b of the guide rail 18.
, It is easy to change from the normal cargo handling operation state to the bottom dredge handling operation state.

<Second Embodiment><Structure> FIG. 4 is a side view of a main part of a bucket chain excavator according to a second embodiment of the present invention, and FIG. 5 is a horizontal frame of the bucket chain excavator shown in FIG. FIG. 6 is a side view of a main part showing a state during normal cargo operation under contraction, FIG. 6 is a side view of a main part showing a state during normal cargo operation under extension of the horizontal frame of the bucket chain excavator shown in FIG. 4, and FIG. 4 is a side view of a main part showing the state of the bottom chain loading operation of the bucket chain excavator shown in FIG. 4 when the horizontal frame is reduced. FIG. 8 is a bottom dredge operation of the bucket chain excavator shown in FIG. It is a principal part side view which shows the state at the time.

As shown in FIG. 4, in the bucket chain excavator according to the second embodiment, the telescopic horizontal frame 20 is provided.
It has. That is, the horizontal frame 20 is a hollow front horizontal frame 20a connected to the lower end of the lower vertical frame 6b.
And a rear horizontal frame 20b slidably engaged with the hollow portion of the front horizontal frame 20a from the rear side, and is connected between the lower surface of the front horizontal frame 20a and the lower surface of the rear horizontal frame 20b. By means 21, the rear horizontal frame 20b is expanded and contracted in the horizontal direction.

In FIG. 4, reference numeral 22 denotes a catenary-curve split guide rail comprising a front guide rail split piece 22a and a rear guide rail split piece 22b. The front guide rail split piece 22a has its front end supported at the lower front end of the front horizontal frame 20a via a shaft 23 so as to match the passage line of the bucket chain 3 (see FIG. 5) during normal cargo handling operation. 23 can be tilted up and down. The rear portion of the front guide rail split piece 22a and the rear guide rail split piece 22b are connected to the front horizontal frame 20.
a vertical guides 16 'provided on the side surface of the vertical guide 16a (one pair for the rear part of the front guide rail split piece 22a and two sets for the rear guide rail split piece 22b);
The movable support frame 17 'is engaged with and guided by the movable support frame 17' so as to be able to move up and down, and the front end is connected to the rear end of the front guide rail split piece 22a and the front end of the rear guide rail split piece 22b. Set of guide rail elevating means 19a
And another set of guide rail lifting / lowering means 19b whose tip is connected to the center of the rear guide rail split piece 22a.

The two guide rail split pieces 22a, 22
b and each movable support frame 17 ′ are loosely pin-connected in the longitudinal direction via a long hole 24. The rear end of the front guide rail split piece 22a, the front end of the rear guide rail split piece 22b, and the center of the rear guide rail split piece 22b are:
Guide rail elevating means 19a and 19b are respectively connected to be tiltable.

The engaging surface of the split type guide rail 22 with the guide roller 43 (not shown in FIGS. 4 to 8; see FIG. 2) has an upper inclined surface, like the guide rail 52 shown in FIG. It is preferable that the upper inclined surface be composed of a vertical surface following the lower end. The number of divisions of the split type guide rail 22 and the vertical guide 1 supporting each guide rail split piece
6 ', movable support frame 17' and guide rail elevating means 19
The numbers and arrangements of a and 19b are not limited to the above configuration, and may be changed as appropriate. The other configuration of the bucket chain excavator is the same as the configuration of the bucket chain excavator shown in FIGS.

<Operation / Effect> Therefore, according to the bucket chain excavator of the second embodiment having the above structure, during normal cargo handling operation, as shown in FIG. 5, each set of guide rail lifting / lowering means 19a, 19b is connected. By adjusting the length to the set length, the guide rail split pieces 22a and 22b are made to coincide with the catenary of the bucket chain 3 during the normal cargo handling operation, and in this state, the bulk is circulated around the bucket chain 3 in the arrow 15 direction. Excavation and unloading work. At this time, the guide roller 43 engages with the upper inclined surface and the vertical surface of the guide rail split pieces 22a and 22b and moves smoothly as in the case of the first embodiment (see FIG. 2). For this reason, the guide roller 4
Abrasion due to friction between the third guide rail 22 and the split type guide rail 22 is greatly reduced, and damage to the bucket 4 and the like is prevented.

As shown in FIG. 6, when excavating a bulk load such as near a wall, the rear horizontal frame 20b is extended by driving the horizontal frame expansion / contraction means 21. When the rear horizontal frame 20b is extended and the horizontal frame 20 is lengthened, the catenary of the bucket chain 3 between the guide sprockets 13 and 14 also changes, and the amount of hanging of the bucket chain 3 decreases. Therefore, at this time, horizontal frame 2
0 is extended to a predetermined length, and at the same time, each guide rail elevating means 19a, 19b is extended by a set distance, and the bucket chain 3 is driven by the chain tensioning means 5.
By adjusting the chain tension of
The catenary of the bucket chain 3 according to the length of the horizontal frame 20 and the catenary curve of the split guide rail 22 can be matched.

At this time, the catenary curve formed by the guide rail split pieces 22a and 22b and the catenary of the bucket chain 3 are slightly different, and the rear end of the split type guide rail 22 and the rear guide sprocket 14 Although there is a portion without a guide rail, the guide roller 43 moves more smoothly along the split type guide rail 22 by forming the engagement surface of the split type guide rail 22 by the upper inclined surface and the vertical surface, It is sent to the rear sprocket 14.

On the other hand, at the time of the bottom-loading operation, as shown in FIGS. 7 and 8, in both the case where the horizontal frame 20 is reduced and the case where the horizontal frame 20 is extended, at the same time as the bucket chain 3 is relaxed and hung down, Guide rail elevating means 1
The guide chains 9a and 19b are reduced to a set length and driven to raise the guide rail split pieces 22a and 22b of the split guide rail 22, and the bucket chain 3 and the split guide rail 2
2, a vertical distance sufficient to avoid damage to the divided guide rails 22 and the like due to pushing up of the bucket 4 due to vertical movement of the ship or the like can be ensured. Therefore, the bucket chain 3 does not need to be drooped excessively, and the excavation and cargo handling work can be performed efficiently with a sufficient contact length between the bucket 4 and the bulk load. When the bucket chain 3 is relaxed, the guide roller 43 slides on the vertical surface of the split type guide rail 22 and smoothly moves down. Therefore, as in the case of the first embodiment, the bottom-loading operation is performed. Easy conversion to state.

[0042]

According to the present invention, as described above in detail with the embodiments, the guide rail is provided with the guide rail elevating means, so that the guide rail is provided with the catenary curve-shaped guide rail, and the guide rail and the guide rail during normal cargo handling operation are provided. While preventing wear due to friction with the rollers, climbing of the guide rollers, and damage due to biting, the vertical distance between the bucket chains and the guide rails is sufficient during the bottom-loading operation without excessive hanging of the bucket chains. Excavation and cargo handling can be performed efficiently while avoiding damage to guide rails and the like caused by pushing up of the bucket due to vertical movement of the ship or the like.

The catenary curve-shaped guide rail is formed by a plurality of guide rail divided pieces, and each of the guide rail divided pieces is moved up and down by means of elevating means, so that a long horizontal section such as a telescopic horizontal frame or the like can be obtained. Whether using a frame or a short horizontal frame, the catenary of the bucket chain and the catenary curve of the guide rail can be matched,
Excavation efficiency can be improved.

Further, by forming the engagement surface of the guide rail by the upper inclined surface and the vertical surface, the guide roller moves more smoothly along the guide rail, and at the same time, from the normal loading operation state to the bottom lifting operation state. The conversion to is easy.

[Brief description of the drawings]

FIG. 1 is a side view showing a state during normal cargo handling operation of a bucket chain excavator according to a first embodiment of the present invention.

2A is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2B is an enlarged view of a portion A in FIG.

3 is a main part side view showing a state of the bucket chain excavator shown in FIG. 1 at the time of bottom dredge operation.

FIG. 4 is a main part side view of a bucket chain excavator according to a second embodiment of the present invention.

5 is a main part side view showing a state of the bucket chain excavator shown in FIG. 4 during a normal cargo handling operation with the horizontal frame reduced.

FIG. 6 is a side view of a principal part showing a state of the bucket chain excavator shown in FIG. 4 during normal cargo handling operation with the horizontal frame extended.

7 is a main part side view showing a state of the bucket chain excavator shown in FIG. 4 during a bottom dredging operation with the horizontal frame reduced.

8 is a main part side view showing a state of the bucket chain excavator shown in FIG. 4 during a bottom dredge operation under extension of a horizontal frame.

FIG. 9 is a side view showing a state during a normal cargo handling operation of the bucket chain excavator according to the related art.

10 is a main part side view showing a state of the bucket chain excavator shown in FIG. 9 at the time of bottom dredge operation.

11 is a sectional view taken along line XI-XI in FIG.

FIG. 12 is a main part side view showing a state during a normal cargo handling operation of a bucket chain excavator according to another related art.

13 is a main part side view showing a state of the bucket chain excavator shown in FIG. 12 at the time of bottom dredge loading operation.

14 is a sectional view taken along line XIV-XIV in FIG.

[Explanation of symbols]

 2 Integrated horizontal frame 3 Bucket chain 4 Bucket 5 Chain tensioning means 6 Vertical frame 6a Upper vertical frame 6b Lower vertical frame 7 Guide roller 8 Axis 9 Lower vertical frame tilting means 10 Horizontal frame tilting means 11, 12, 13, 14 Guide sprocket 15 Bucket chain circulating direction 16, 16 'Vertical guide 17, 17' Movable support frame 18 Guide rail 19, 19a, 19b Guide rail elevating means 20 Telescopic horizontal frame 20a Front horizontal frame 20b Rear horizontal frame 21 Horizontal frame expanding and contracting means 22 Split type guide rail 22a, 22b Guide rail split piece 23 Axis 24 Slot 30 Bucket elevator column 43 Guide roller 52a Upper inclined surface of guide rail 52b Vertical surface of guide rail

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Kiyota 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Headquarters Equipment Technology Center (72) Inventor Hisashi Suematsu Shintomi, Futtsu-shi, Chiba 20-1 Inside Nippon Steel Corporation Technology Development Division Equipment Technology Center (56) References JP-A-7-76424 (JP, A) JP-A-7-309451 (JP, A) JP-A 8- 133487 (JP, A) Japanese Utility Model Showa 62-108338 (JP, U) Japanese Utility Model Showa 62-108339 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02F 5/06 E02F 3 / 14 B65G 17/12 B65G 65/06 B65G 67/60

Claims (3)

(57) [Claims] 1. A bucket chain circulating along an L-shaped or inverted T-shaped frame composed of a vertical frame and a horizontal frame, a bucket attached to the bucket chain, and a guide provided on the bucket chain side. A bucket chain excavator comprising: a catenary curved guide rail attached to the horizontal frame side so as to engage with a roller to guide the bucket chain; and elevating means for elevating the guide rail to the horizontal frame side. A bucket chain excavator comprising: 2. The apparatus according to claim 1, wherein the guide rail is formed by a plurality of guide rail divided pieces divided in a length direction, and the elevating means is configured to be able to elevate each of the guide rail divided pieces. Claim 1 characterized by the following:
The bucket chain excavator according to item 1. 3. The device according to claim 1, wherein an engagement surface of the guide rail with the guide roller comprises an upper inclined surface and a vertical surface continuous with a lower end of the upper inclined surface. Bucket chain drilling rig.