JP3487193B2 - Grab bucket landing detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoisting wire rope, which is attached to an elevating wire drum of a crane body suspended along a crane rail so as to be vertically movable via a final sheave. The present invention relates to a grab bucket landing detection device.

[0002]

2. Description of the Related Art In general, powder that has settled at the bottom of a settling basin in which water is stored is supported by a hoisting wire rope that is attached to a lifting wire drum installed in a crane body, and is vertically movable via a final sheave. It is carried out by using the grab bucket that has been picked up and loaded. When carrying out such a powder handling operation, it is impossible to visually confirm that the grab bucket lands on the powder deposited in the water if the water is cloudy. So the crane operator
After confirming that the grab bucket has landed on the powder deposited in the water by checking the looseness of the wire rope that controls the lifting of the grab bucket, the descent is stopped.

If the visual confirmation is neglected or the confirmation operation is delayed, the wire rope becomes too loose and comes out of the sheave, resulting in inoperability. In order to prevent this, it is important to reliably detect that the grab bucket has landed on the powder. Similarly, when remotely operating or unmanning such work, recognizing that the grab bucket has landed on the powder can be used to ensure that the powder is grabbed by the grab bucket or the wire rope is sheave. It is the most important issue to prevent the crane from coming off, and unless this is resolved, remote control and unmanned operation of a crane equipped with a grab bucket cannot be achieved.

As a means for lowering a grab bucket which is vertically movably supported via a final sheave and detecting that the powder deposited on the floor has landed, there is, for example, Japanese Patent Laid-Open No. Sho 59-59.
-As disclosed in Japanese Laid-Open Patent Publication No. 36095, a supporting wire rope, which is attached to a lifting wire drum installed on a crane body hung freely by wheels on a crane rail, is vertically moved via a final sheave. When the freely supported grab bucket is unwound, the load load detector provided in the support wire guide support means detects the load load when the support wire rope is unwound, and the glove bucket moves above the floor based on the change in the detected load load. It is known to detect landing on the powder deposited on the.

This landing detecting means can also be applied to confirm that the grab bucket as described above land on the powder deposited in water. When a load detector of this type is installed in the crane body, the load detector is usually installed directly below the support shaft (vertical shaft) that rotatably supports the final sheave as disclosed in Japanese Utility Model Publication No. 63-20709. It is located just below the direction). Therefore, the load detector detects the actual load of the grab bucket until the grab bucket descends and lands on the powder deposited on the floor as the load applied to the final sheave.

[0006]

As described above, since the conventional load detector is arranged immediately below the load point of the final sheave, the actual load applied to the final sheave before the grab bucket lands on the powder. In addition to detecting the load, the actual load applied to the final sheave when raising the grab bucket holding the powder is detected.

Therefore, when a large amount of powder is processed by a large grab bucket, it is necessary to use an extremely large capacity load load detector, and there is a problem that equipment costs increase. In addition, if the volume of powder to be processed by the grab bucket needs to be changed significantly, it will be necessary to replace it with a new load detector according to the allowable load for weighing. become.

The present invention solves the above-mentioned problems of the prior art, and when a large amount of powder is processed by a grab bucket, a relatively inexpensive small-capacity load detector can be used and the glove bucket can be used for processing. An object of the present invention is to provide a landing detection device for a grab bucket that can easily cope with a large change in the volume of powder to be used.

[0009]

In order to achieve the above object, the present invention according to claim 1 is provided on a supporting wire rope attached to a lifting drum of a crane body at a tip portion of a boom of the crane body. In a grab bucket supported movably up and down via a final sheave, a support bracket that is arranged at the boom tip of the crane body and rotatably supports the final sheave at an intermediate portion in the longitudinal direction, and a support bracket of the support bracket. A bearing fixed to the crane main body that rotatably supports a bracket support shaft arranged at one end in the longitudinal direction, a lower surface of the other end in the longitudinal direction of the support bracket, and an upper surface of a seat provided on the crane main body. A compression type load detector that is set in a direction in which a compressive force is applied and detects that the grab bucket has landed ,
The arrangement position of the compression type load detector is set to the compression type load detector.
Depending on the weighing capacity of the heavy detector,
A landing detection device for a grab bucket, which is changeable in the longitudinal direction .

[0010] The present invention 請 Motomeko 2 wherein is a landing detector grab bucket according to claim 1 Symbol mounting characterized by comprising a rotation counter for lifting the rotating part of the lifting drum.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a crane body 1 is movably suspended on a crane rail 1 via wheels 4, and an opening / closing drum 11 and a lifting drum 12 are mounted on the crane body 2. It is arranged.
Two open / close wire ropes 18 attached to the open / close drum 11
Also, the two lifting wire ropes 19 attached to the lifting drum 12 are capable of moving up and down via the four final sheaves 6 provided at the tip of the boom 5 that constitutes the crane body 2 (side view). Is shown). The four final sheaves 6 are independently rotatably set on the sheave support shaft 14. The lower part of the crane body 2 is an operation room 17, and an operation panel and various instruments are arranged in the operation room 17.

As shown in FIG. 3, a support bracket 7 is arranged in the longitudinal direction of the tip end portion of the boom 5 which constitutes the crane main body 2. The support bracket 7 is provided with a sheave support arranged at an intermediate portion in the longitudinal direction thereof. The final sheave 6 is supported by a bearing 16 via a shaft 14. The support bracket 7 is rotatably supported by a bearing 20 fixed to the boom 5 constituting the crane body 2 via a bracket support shaft 15 arranged at one end in the longitudinal direction. At the other end of the support bracket 7 in the longitudinal direction, a compression type load cell 8 which is a kind of a compression type load detector is set in the direction in which a compression force is applied between the lower surface of the support bracket 7 and the seat 21 provided on the boom 5. Has been done. Further, the lifting / lowering drum 12 is provided with a lifting / lowering rotation speed counter 9 at its rotating portion.
An opening / closing rotation speed counter 10 is arranged at the rotating portion of 11.

As shown in the front view in FIG. 4, a suspension member provided at the center of the upper end of the support member 23 constituting the grab bucket 3.
Two lifting wire ropes 19 are connected to 24, and the two opening / closing wire ropes 18 penetrate through two guide holes 25 vertically provided in the supporting member 23 and the supporting block 26 located below.
Attached to the top of. In addition, a pair of bucket shells 29 are openably and closably supported at the lower part of the support block 26 via pins 28. Then, the connecting members 27 arranged between the both ends of the support member 23 and the both ends of the pair of bucket shells 29 are connected using the upper pin 30 and the lower pin 31.

As shown in FIG. 5, the opening / closing operation of the pair of bucket shells 29 constituting the grab bucket 3 is performed as follows. When the pair of bucket shells 29 are opened and stopped when the support block 26 is in the solid line position, the support member 23 supported via the suspension member 24 connected to the lifting wire rope 19 is stopped and opened and closed. Wire rope
The pair of bucket shells 29 is changed from the open state to the closed state by raising 18 and raising the support block 26 from the solid line position to the dotted line position. Conversely, by lowering the support block 26 from the dotted line position to the solid line position, the pair of bucket shells 29 can be changed from the closed state to the open state. At this time, the rotation speed is detected by using the opening / closing rotation speed counter 10 attached to the rotating portion of the opening / closing drum 11.

The coke dust that has settled in the water of a sedimentation basin installed near the inside of the coke wet fire extinguisher tower according to the present invention will be described below.
A landing detection device for a grab bucket when the grab bucket included in the crane is used to grab and transport the glove bucket will be described. When the red hot coke that has been carbonized in the coke oven is discharged to the outside of the furnace and then cooled by the wet method, the fire engine loaded with the red hot coke is transported into the fire extinguisher tower, and a large amount of water is sprayed to cool the coke. At this time, since the water sprayed in the fire extinguisher is accompanied by a large amount of dust, mainly coke, the sprayed water is collected and sent to a sedimentation basin, and the dust is sedimented and separated, and then the supernatant water is pumped again. It is used to extinguish red hot coke. On the other hand, the dust that has settled and separated into the water of the settling tank is carried out of the grab bucket by the grab bucket.

As shown in FIG. 6A, the water 34 in the sedimentation tank 32 is
Since the amount of the settled dust 13 deposited inside and deposited on the bottom surface 33 gradually increases, the crane main body 2 is run at a timing when the settled set dust 13 is deposited and stopped above the settling tank 32. . Opening / closing drum 11 and lifting drum
12 is synchronously rotated to the rewinding side, and the two wire ropes 18 for opening and closing and the wire rope 19 for raising and lowering are paid out,
The grab bucket 3 (the bucket shell 29 is left open in advance) is lowered through the final sheave 6.

At this time, the self-weight of the grab bucket 3 is continuously detected by the compression type load cell 8. In the compression type load cell 8, the surface of the set dust 13 on which the grab bucket 3 is deposited on the bottom surface 33 of the settling tank 32 is detected. In order to detect the ground contact with the ground, the load value that is considerably smaller than the weight of the grab bucket 3 in the water 34 is set as the ground contact detection load as the ground load to the precipitated dust 13.

Therefore, when the grab bucket 3 is immersed in the water 34 of the settling basin 32, the own weight of the grab bucket 3 is reduced by a load corresponding to the specific gravity of water, but at this time, it is detected by the compression type load cell 8. Since the load is larger than the set load, the grab bucket 3 descends in the water 34 as it is. Since the load detected by the compression type load cell 8 becomes a value smaller than the set load at the moment when the lower end of the grab bucket 3 comes in contact with the surface of the settled dust 13 accumulated in the settling tank 32, the load from the compression type load cell 8 is set below the set load. Is transmitted, and by this, a trigger (command) for stopping the lowering of the grab bucket is output, and the brakes provided on the opening / closing drum 11 and the lifting drum 12 are immediately activated to ensure the lowering of the grab bucket 3. Stop at. As a result, even if the water 34 in the settling basin 32 is turbid and the surface of the settling dust 13 is not visible, and even if the level or shape of the settling dust 13 is in any state, the wire rope is loosened at the surface position of the settling dust 13 Therefore, the grab bucket 3 can be surely stopped without being tilted.

Subsequently, the opening / closing drum 11 is driven in the winding direction according to the conventional procedure, and as shown in FIG. 5, the support block 26 is raised from the solid line position to the dotted line position via the opening / closing wire rope 18 to make a pair. The sediment dust 13 is grasped by closing the bucket shell 29 of the above [see (B) of FIG. 6]. Next, the opening / closing drum 11 and the lifting drum 12 are synchronously rotated in the winding direction, and the grab bucket 3 is lifted to a predetermined height above the sedimentation basin 32 via the opening / closing wire rope 18 and the lifting wire rope 19. In this state, the crane main body 2 is moved above a dehydration tank (not shown), and the dust caught in the grab bucket 3 is put into the dehydration tank for dehydration. The dust that has been dehydrated in the dehydration tank is loaded on a truck and transported to the destination.

If no settling dust 13 has settled in the water 34 of the settling basin 32, as described above, the grab bucket 3
If the compression load cell 8 detects the moment when the lower end of the ground contacts the bottom surface 33 of the settling basin 32, the grab bucket 3 may collide with the bottom surface 33 of the settling basin 32 constructed of strong concrete and be damaged. The nature is great. Therefore, a lifting / lowering rotation speed counter 9 is provided in the rotating portion of the lifting / lowering drum 12, and the lifting / lowering rotation speed counter 9 includes the grab bucket 3
The rotation speed of the lifting drum 12 corresponding to the descent distance immediately before the tip of the head collides with the bottom surface 33 of the settling basin 32 is input as the set rotation speed. Thus, when the grab bucket 3 is mistakenly lowered while there is no settled dust 35 in the water 34 of the settling basin 32, the compression type load cell 8 is moved up and down before it is detected that the load becomes equal to or less than the set load. Rotation speed counter 9
To detect the set speed. As a result, the lifting rotation speed counter 9 outputs a descent stop trigger, the brakes provided on the opening / closing drum 11 and the lifting drum 12 are immediately actuated, and the lowering of the grab bucket 3 is stopped. The collision with the bottom surface 33 of the settling tank 32 is prevented in advance.

As described above, according to the present invention, the crane body 2
The support bracket 7 is arranged at the tip of the boom 5 constituting the above, and the final sheave 6 is supported by the sheave support shaft 14 arranged at an intermediate portion in the longitudinal direction of the support bracket 7. Then, the support bracket 7 is rotatably supported by the bearing 20 fixed to the crane body 2 via the bracket support shaft 15 arranged at the tip portion in the longitudinal direction. On the other hand, the support bracket 7 is supported by the compression type load cell 8 which is set in a direction in which a compression force is applied between the lower surface of the rear end portion in the longitudinal direction and the upper surface of the receiving seat 21 provided on the crane body 2. In addition,
In some cases, the arrangement of the sheave support shaft 14 and the compression type load cell 8 arranged in the longitudinal direction of the support bracket 7 can be switched to the opposite side.

As a result, the support bracket 7 is rotatable around the bracket support shaft 15 integrally with the final sheave 6 arranged in the middle portion, and the position of the compression type load cell 8 in the longitudinal direction of the support bracket 7 is set. The distance is larger than the position where the final sheave 6 is arranged with respect to the bracket support shaft 15. That is, if the distance between the bracket support shaft 15 and the compression type load cell 8 is L and the distance between the bracket support shaft 15 and the final sheave 6 is W, then L> W. As a result, the load smaller than the actual load applied to the final sheave 6 is detected by the compression type load cell 8, so that the grab bucket 3 can detect landing on the settling dust 13 in the settling tank 32, and the capacity is small and inexpensive. The compression type load cell 8 can be used.

If the support bracket 7 is made long in advance as shown by the dotted line in the longitudinal direction, the arrangement position of the compression type load cell 8 can be changed at a large number of points in the longitudinal direction (see FIG. 3). Also, by replacing the support bracket 7, it becomes possible to select various arrangement positions of the final sheave 6 and the compression type load cell 8 with respect to the bracket support shaft 15.

In the embodiment of the present invention described above, the case of detecting the landing of the grab bucket 3 on the settling dust 13 settling and separating in the water 34 of the settling tank 32 has been described, but the present invention is not limited to this. Needless to say, the present invention can be applied to the case where the grab bucket is landed on various dusts accumulated in the atmosphere.

[0025]

As described above, according to the present invention,
The arrangement of the compression type load detector in the longitudinal direction of the support bracket arranged at the boom tip of the crane body
The distance is larger than the position of the final sheave with respect to the bracket support shaft. Therefore, the grab bucket can land on the accumulated powder with a load smaller than the actual load applied to the final sheave by the compression load detector, and a compression load detector with a small capacity and low cost is used. It will be possible. In addition, the position of the compression type load detector relative to the support bracket can be easily changed, without changing the compression type load detector according to the allowable load for weighing, such as changing the weight of the powder picked up by the grab bucket. It can be easily handled.

[Brief description of drawings]

FIG. 1 is a side view showing a crane equipped with a grab bucket landing detection device of the present invention.

FIG. 2 is a plan view showing the direction of arrow AA in FIG.

FIG. 3 is a side view showing a boom tip portion of a crane provided with the grab bucket landing detection device of the present invention.

FIG. 4 is a front view showing a grab bucket used in the present invention.

FIG. 5 is an explanatory diagram showing an opening / closing operation of the grab bucket used in the present invention.

FIG. 6 is an explanatory view showing a situation in which the grit bucket of the crane equipped with the landing detection device of the present invention grabs and carries out the settled dust that has settled and separated in the water of the settling basin, and (A) shows the glove bucket opened. The state (B) is the state where the grab bucket is closed.

[Explanation of symbols]

1 crane rail 2 crane body 3 grab bucket Four wheels 5 boom 6 final sheave 7 Support bracket 8 compression type load cell 9 Lifting speed counter 10 Open / close speed counter 11 Opening and closing drum 12 Lifting drum 13 Precipitated dust 14 sheave support shaft 15 Bracket support shaft 16, 20, 22 bearings 17 Control room 18 open / close wire rope 19 Lifting wire rope 21 seat 23 Support member 24 Hanging member 25 Guide hole 26 Support block 27 Connecting member 28 pin 29 bucket shell 30 upper pin 31 bottom pin 32 settling basin 33 Bottom 34 water

Claims (2)

(57) [Claims] 1. A grab bucket in which a supporting wire rope attached to a lifting drum of a crane main body is liftably supported via a final sheave provided at the tip of a boom of the crane main body. A support bracket that is arranged at the tip of the boom and rotatably supports the final sheave at an intermediate portion in the longitudinal direction, and a crane body that rotatably supports a bracket support shaft that is disposed at one longitudinal end of the support bracket. A bearing fixed to
A compression type load detector that is set in a direction in which a compressive force is applied between the lower surface of the other end of the support bracket in the longitudinal direction and the upper surface of a seat provided on the crane body, and detects that the grab bucket has landed. And the compression type load
The placement position of the load detector is determined by the measurement of the compression type load detector.
Change in the longitudinal direction of the support bracket according to the allowable load.
A landing detection device for a grab bucket, which is capable of being changed . 2. A landing detector grab bucket according to claim 1 Symbol mounting characterized by comprising a rotation counter for lifting the rotating part of the lifting drum.