JP2017030885A - Grab bucket, and unloader equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grab bucket that inhibits ropes from being caught between a structure constituting the grab bucket and a sheave arranged for the structure to interrupt conveyance work, and can improve conveyance efficiency, and an unloader equipped with the grab bucket.SOLUTION: A grab bucket comprises: a pair of opening/closing parts which house and convey an object to be conveyed; a support part 3 which openably/closably and pivotally supports the pair of opening/closing parts; and a disc-shaped sheaves 5 which are rotatably installed to the support part 3, around which ropes 6 are wound, and which includes a groove part 11 formed on a circumferential surface of the sheave 5 and allowing the rope 6 to be fitted thereinto and guided along a circumferential direction, and at least a part of the sheave 5 is in an exposed state. Scrapers 16 are installed at prescribed positions in a range P2 in which the ropes 6 are not fitted into the groove parts 11.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a grab bucket used when transporting an object to be transported and an unloader provided with the grab bucket. Specifically, a rope is provided between a structure constituting the grab bucket and a sheave disposed in the structure. The present invention relates to a grab bucket capable of suppressing interruption of the transfer operation by biting and improving the transfer efficiency, and an unloader including the grab bucket.

  Various unloaders have been proposed for use when unloading bulk cargo such as coal or iron ore from bulk carriers (see, for example, Patent Document 1).

  Document 1 proposes an unloader comprising a trolley that traverses along the girder and a grab bucket suspended from the trolley. The grab bucket is provided with a pair of opening / closing parts that accommodate and convey the object to be conveyed, a support part that rotatably supports the opening / closing part, and a plurality of sheaves that are rotatably arranged on the support part. A rope is looped around the groove formed on the peripheral surface of the sheave.

  When the grab bucket is transferred toward a bulk load such as coal, the coal may adhere to the groove portion of the sheave. The coal adhering to the groove is sandwiched between the sheave and the rope as the sheave rotates and is compressed and fixed to the sheave. The amount of coal fixed in the groove gradually increases.

  The rope is pushed out of the sheave in the radial direction by the coal adhering to the groove and deposited. The rope pushed out between the structure constituting the support and the sheave is caught and the sheave cannot be rotated.

  The cargo handling operation is interrupted each time the rope bites. Each time the cargo handling operation was interrupted, a cleaning operation to remove the coal adhering to the groove portion of the sheave had to be carried out, resulting in a problem that it was difficult to improve the efficiency of carrying bulk goods.

JP 2014-118230 A

  The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent the transfer work from being interrupted due to the rope being caught between the structure constituting the grab bucket and the sheave disposed in the structure. In addition, an object of the present invention is to provide a grab bucket capable of improving the conveyance efficiency and an unloader including the grab bucket.

The grab bucket according to the present invention that achieves the above object includes a pair of opening / closing sections that accommodate and convey the object to be transported, a support section that pivotally supports the pair of opening / closing sections so as to be openable and closable, and is rotatable on the support section. A disk-shaped sheave installed around the rope, and the sheave includes a groove formed on the circumferential surface of the sheave and guided by fitting the rope along the circumferential direction. In the grab bucket in which at least a part of the sheave is exposed, a scraper is provided at a predetermined position in a range where the rope does not fit in the groove.

  According to the present invention, since the object to be conveyed that adheres in the groove can be scraped out of the groove by the scraper, it is possible to suppress the object to be adhered and deposited in the groove. For this reason, it is possible to avoid the occurrence of a problem that the rope is pushed out to the outside in the radial direction of the sheave by the transported object and the rope is caught between the structure constituting the support portion and the sheave.

  Since the object to be conveyed that adheres in the groove portion can be scraped out of the groove portion by the scraper, there is no need to periodically stop the conveying operation and clean the sheave. Since the work of transporting the object to be transported by the grab bucket can be continuously performed for a long time, it is advantageous for improving the transport efficiency.

  In a range in which the rope is fitted in the groove portion, a pair of rope detachment stoppers arranged so as to sandwich the sheave from both sides in the rotation axis direction can be provided. According to this configuration, it is possible to prevent the rope from coming off the sheave.

  The rope detachment stopper can be formed intermittently along the circumferential direction of the sheave. Since the object to be conveyed attached to the sheave is easily discharged to the outside from the portion where the rope stopper is not installed, the object to be conveyed accumulates in the space formed by the sheave, the structure and the rope stopper, It is advantageous to suppress the sheave from being in a non-rotatable state due to the transported object jammed in this space.

  The distance from the bottom surface of the groove portion to the structure constituting the support portion facing the bottom surface is configured to be 140% or more of the diameter of the rope, and the distance from the top portion of the groove portion to the structure facing the top portion is determined by the rope. 90% or less of the diameter. By increasing the distance from the bottom surface of the groove portion to the structure, it is possible to make it difficult to remove the rope from the groove portion, and to increase the allowable amount of the object to be transported deposited in the groove portion.

  The scraper can be configured to be disposed in the vicinity of the boundary between the range in which the rope is not fitted in the groove and the range in which the rope is fitted. Since the object to be conveyed can be scraped out of the groove before being compressed between the sheave and the rope, it is advantageous to prevent the object to be deposited in the groove of the sheave. In addition, since the scrapers are respectively arranged in the vicinity of the boundary, even if the sheave rotates in any direction, the conveyed object can be scraped before being compressed between the sheave and the rope.

It is explanatory drawing which illustrates the grab bucket of this invention. It is explanatory drawing which illustrates the grab bucket of FIG. 1 by a side view. It is explanatory drawing which illustrates the grab bucket of FIG. 1 by planar view. It is explanatory drawing which expands and illustrates the sheave arrange | positioned at a support part. It is explanatory drawing which illustrates the sheave of FIG. 4 by AA arrow. It is explanatory drawing which illustrates the sheave of FIG. 4 by BB arrow. It is explanatory drawing which illustrates the sheave of FIG. 5 by CC arrow. It is explanatory drawing which illustrates the operation state of a scraper. It is explanatory drawing which illustrates the modification of FIG. It is explanatory drawing which illustrates the scraper of FIG. 9 by DD arrow. It is explanatory drawing which illustrates the modification of FIG. It is explanatory drawing which illustrates the positional relationship of the groove part of a sheave and a structure.

  Hereinafter, a grab bucket of the present invention and an unloader including the grab bucket will be described based on the embodiments shown in the drawings. In the figure, the open / close direction of the grab bucket is indicated by an arrow x, the horizontal direction orthogonal to the open / close direction x is indicated by an arrow y, and the vertical direction is indicated by an arrow z.

  As illustrated in FIGS. 1 to 3, the grab bucket 1 of the present invention includes a pair of opening / closing parts 2 that accommodates and conveys an object to be conveyed such as coal or iron ore, and a shaft that can open and close the pair of opening / closing parts 2. The support part 3 to support is provided. Each opening / closing part 2 is pivotally supported by the support part 3 so as to be tiltable around a support pin 4 installed in the support part 3. As illustrated in FIG. 2, two disk-shaped sheaves 5 are arranged on the support portion 3, and an opening / closing wire rope (hereinafter also referred to as an opening / closing rope) 6 is hung around the sheave 5. Yes.

  A lifting portion 7 is disposed above the support portion 3, and a lifting wire rope (hereinafter sometimes referred to as a lifting rope) 8 is connected to the lifting portion 7. In addition, two sheaves 5a are arranged in the lifting portion 7, and an opening / closing rope 6 is hung around. In the figure, the sheave 5a disposed in the lifting portion 7 is indicated by a broken line. The lifting portion 7 and the upper four corners of the pair of opening / closing portions 2 are respectively connected by arm portions 9.

  The grab bucket 1 is installed in an unloader that handles loose loads such as coal or iron ore, or a dredger that excavates the sediment on the seabed. The unloader includes a boom extending in the horizontal direction and a trolley that moves along the boom, and the grab bucket 1 is sometimes referred to as an open / close rope 6 and a lifting rope 8 (hereinafter, collectively referred to as a rope). ).

  As illustrated in FIGS. 4 to 7, a housing 10 is installed on the structure 3 constituting the support portion 3, and the sheave 5 is disposed inside the housing 10.

  Grooves 11 are formed on the peripheral surface of the sheave 5 disposed in the housing 10. The groove 11 is formed along the circumferential direction of the sheave 5, and the opening / closing rope 6 is guided. For example, when the opening / closing rope 6 extending downward from the trolley or the like toward the sheave 5 is disposed in a state substantially parallel to the opening / closing rope 6 extending upward from the sheave 5 toward the trolley or the like, the opening / closing rope 6 is 5 is guided by being fitted into the groove 11 located in the lower half of the line 5. That is, in this case, as illustrated in FIG. 5, the lower half of the groove 11 is a range P1 in which the opening / closing rope 6 is fitted, and the upper half of the groove 11 is a range P2 in which the opening / closing rope 6 is not fitted. In the figure, a boundary between a range P1 in which the open / close rope 6 is fitted and a range P2 in which the open / close rope 6 is not fitted is indicated by b. A state in the groove 11 of the sheave 5 is indicated by a broken line.

  The housing 10 includes a pair of side wall portions 12 disposed to face each other, and an auxiliary wall portion 13 that couples the opposite end portions of the side wall portion 12 to each other. As illustrated in FIG. 5, the pair of side wall portions 12 is formed of a substantially pentagonal flat plate, and the auxiliary wall portion 13 is formed of a rectangular flat plate. The side wall portion 12 is disposed in a state in which a rotating shaft 14 that rotatably supports the two sheaves 5 disposed therebetween passes therethrough. In addition, a beam portion 15 that connects the side wall portions 12 is installed at the upper ends of the pair of side wall portions 12. The beam portion 15 is formed of a cylindrical horizontal member and is located above the sheave 5. The beam portion 15 extends in a direction parallel to the rotation shaft 14 of the sheave 5.

  The auxiliary wall portion 13 is configured to be shorter than the side wall portion 12 in the vertical direction, and there are gaps between the auxiliary wall portion 13 and the structure 3 and between the auxiliary wall portion 13 and the beam portion 15. . Therefore, at least a part of the sheave 5 disposed in the housing 10 is exposed, and the housing 10 is not sealed.

  For example, when the housing is sealed, it is necessary to form a through hole on the top surface of the housing to penetrate the open / close rope, but there is a problem that the open / close rope comes into contact with the peripheral surface of the through hole and wears out. To do. On the other hand, the grab bucket 1 of the present invention is in a state in which no other members are arranged above the housing 10 except for the beam portion 15, so that the opening / closing rope 6 is part of the housing 10. It is advantageous to avoid problems such as contact deterioration. Moreover, since the housing | casing 10 is not a sealing state, it is advantageous for an operator etc. to confirm the state of the sheave 5 visually, or to perform maintenance when abnormality etc. generate | occur | produce in the sheave 5.

  The beam portion 15 is provided with a scraper 16 that extends downward toward the groove portion 11 of the sheave 5. As illustrated in FIGS. 5 and 7, the upper end of the scraper 16 is fixed to the beam portion 15, and the lower end is extended to the vicinity of the bottom surface 17 of the groove portion 11. In this embodiment, the scraper 16 is disposed at a height at which the lower end thereof does not contact the bottom surface 17 of the groove portion 11 of the sheave 5. The scraper 16 is disposed at a position corresponding to a range P <b> 2 in which the opening / closing rope 6 is not fitted in the groove portion 11. In this embodiment, the scraper 16 is disposed immediately above the rotating shaft 14.

  The scraper 16 can be made of a metal such as massive iron, for example. The scraper 16 is not limited to this, and may have a function of scraping the bulk load that has entered the groove portion 11 from the groove portion 11 to the outside thereof. For example, the scraper 16 may be formed of a block-like resin or a brush.

  The cross-sectional shape in the direction orthogonal to the circumferential direction of the sheave 5 is desirably a shape that follows the shape of the groove 11, for example. That is, the lower end of the scraper 16 is formed in a curved shape along the bottom surface 17 of the groove portion 11 so that the width of the scraper 16 is the same as the width of the groove portion 11. It is advantageous to scrape the object to be conveyed attached to the groove 11 from the groove 11 to the outside without leakage. In a case where at least a part of the scraper 16 is brought into contact with the groove 11, a resin material or a brush may be arranged in a portion in contact with the groove 11. It is advantageous to suppress the groove 11 from being worn or deformed by contact with the scraper 16.

  The structure 3 is provided with a rope detachment stop 18 that covers the side of the sheave 5. A pair of rope stoppers 18 that cover the sides of the sheave 5 are also provided on the pair of auxiliary walls 13. That is, the rope detachment stop 18 is arranged in a state where the sheave 5 is sandwiched from both sides in the extending direction of the rotating shaft 14 of the sheave 5. The rope detachment stop 18 has a function of preventing the rope 6 from jumping out from the groove 11 of the sheave 5 when the opening / closing rope 6 is loosened. The rope detachment stopper 18 is disposed in a range P1 in which the opening / closing rope 6 is fitted, and is intermittently disposed along the circumferential direction of the sheave 5 in this embodiment.

  The rope detachment stop 18 may be configured to cover the entire range P <b> 1 in which the opening / closing rope 6 is fitted along the circumferential direction of the sheave 5.

  In this embodiment, since the two sheaves 5 are arranged adjacent to each other in the axial direction (the extending direction of the rotating shaft 14), the opening / closing rope 6 fitted in one sheave 5 is on the other sheave 5 side. There is little to go to. Therefore, the rope detachment stop 18 is arranged so as to sandwich the two sheaves 5 from both axial sides. The installation position of the rope release stopper 18 is not limited to this configuration. You may make it the structure which installs the rope coming-off prevention 18 in the state which pinches | interposes two sheaves 5 from the both sides of the axial direction, respectively. In other words, the rope detachment stopper 18 may be additionally installed between the two sheaves 5.

When the sheave 5 is arranged close to the structure 3 and the possibility that the opening / closing rope 6 is detached from the sheave 5 is relatively low, the rope detachment stopper 18 may not be provided. That is, the rope detachment stopper 18 is not an essential configuration of the present invention.

  When using the grab bucket 1 installed in the unloader to transport a bulk load (conveyed material) such as coal in a bulk carrier to a bulk material yard, first the open / close rope 6 and the lifting rope 8 are At the same time, the grab bucket 1 is lowered toward the bulk load in the hold. In the middle of lowering the grab bucket 1, the pair of opening / closing portions 2 is opened by feeding a relatively large number of opening / closing ropes 6 with respect to the lifting rope 8. While opening the opening / closing part 2, the grab bucket 1 is dropped toward the loose load, and the opening / closing part 2 is inserted into the loose load.

  The pair of opening / closing sections 2 are closed by winding a relatively large number of the opening / closing ropes 6 with respect to the lifting rope 8, and loose loads are accommodated in the opening / closing sections 2. Thereafter, the open / close rope 6 and the lifting rope 8 are wound up at the same time, and the grab bucket 1 is raised with the closed state.

  As illustrated in FIG. 8, when the opened grab bucket 1 is dropped toward a bulk load such as coal and invaded, the bulk load may enter the housing 10. Part of the bulk load that has entered the housing 10 adheres to the groove 11 of the sheave 5.

  When the grab bucket 1 is opened / closed or lifted / lowered, the opening / closing rope 6 is wound up or fed out, and the sheave 5 rotates accordingly. In this embodiment, the sheave 5 rotates clockwise. The loose load adhering to the groove 11 is compressed between the opening and closing rope 6 as the sheave 5 rotates. This loose load is sandwiched between the groove portion 11 and the opening / closing rope 6 in a range P <b> 1 in which the opening / closing rope 6 is fitted, and is compressed and fixed to the groove portion 11. If the bulk load in the groove portion 11 is left unattended, the amount of bulk load accumulated in the groove portion 11 increases, and the open / close rope 6 is pushed outward in the radial direction of the sheave 5, and any bite occurs with the structure 3. To do.

  In the grab bucket 1 of the present invention, a scraper 16 that scrapes the bulk load adhering to the groove portion 11 to the outside of the groove portion 11 is disposed in a range P2 in which the open / close rope 6 is not fitted. Therefore, in the rotational direction of the sheave 5, the loose load adhering to the groove 11 before the scraper 16 is scraped out of the groove 11 by the scraper 16. The loose load adhering to the groove portion 11 behind the scraper 16 is then compressed between the opening and closing rope 6, but eventually reaches the position where the scraper 16 is disposed by the rotation of the sheave 5, and the scraper 16 causes the groove portion 11 to be disposed. From outside.

  With the configuration in which the scraper 16 is installed in the vicinity of the sheave 5, it is possible to suppress the accumulation of loose loads in the groove portion 11 and the increase in the accumulation amount. This eliminates the need to interrupt the conveying operation and clean the groove 11 of the sheave 5. That is, since the conveyance work by the grab bucket 1 can be performed continuously for a long time, it is advantageous to improve the conveyance efficiency of bulk loads.

  As illustrated in FIG. 5, the rope detachment stopper 18 is intermittently disposed along the circumferential direction of the sheave 5, so that there is a loose load in the space formed by the sheave 5, the structure 3, and the rope detachment stopper 18. It is advantageous to suppress the sheave 5 from being in a non-rotatable state due to the piled load and the bulk load stuck in this space.

  Although the grab bucket 1 including the casing 10 in which a part of the sheave 5 is exposed has been described, the scraper 16 may be installed in the grab bucket including a sealed casing. In the case of a hermetically sealed housing, there is a low possibility that loose loads will enter the groove 11 of the sheave 5, but the state of the groove 11 should be maintained better by the installation of the scraper 16 than there is no loose load adhering or accumulating. Can do.

As illustrated in FIGS. 9 and 10, the scraper 16 may be configured such that the tip of the scraper 16 is positioned in the vicinity of the boundary b between the range P1 in which the open / close rope 6 is fitted and the range P2 in which the open / close rope 6 is not fitted. In this embodiment, a scraper 16 is disposed in the vicinity of two open / close ropes 6 extending upward from the sheave 5.

  As illustrated in FIG. 10, the scraper 16 is formed in a frame shape in a plan view, and a through hole 19 through which the open / close rope 6 passes is formed in the center. The scraper 16 includes a shaft portion 20 that is fixed to, for example, the side wall portion 12 and the auxiliary wall portion 13 of the housing 10, and a contact portion 21 that is formed at a position facing the shaft portion 20. In FIG. 10, one scraper 16 is indicated by a broken line for the purpose of explanation. Further, the axial direction c of the shaft portion 20 is indicated by a one-dot chain line.

  The tip of the contact portion 21 is formed in a shape corresponding to the groove portion 11 of the sheave 5 and is in contact with the bottom surface 17 of the groove portion 11 in a range P2 where the opening / closing rope 6 is not fitted. The tip of the contact portion 21 of the scraper 16 is in contact with the groove portion 11 in the vicinity of the boundary b. As illustrated in FIG. 9, the scraper 16 is arranged in a state where the contact portion 21 is higher than the shaft portion 20 in the vertical direction. Therefore, the contact portion 21 comes into contact with the bottom surface 17 at an angle close to the tangent line of the sheave 5.

  When the sheave 5 rotates, for example, clockwise, the loose load adhering to the groove portion 11 is scraped out of the groove portion 11 by the contact portion 21 of the scraper 16 on the right side of FIG. Since the scraper 16 is disposed at an angle close to the tangent line of the sheave 5, the loose load scraped out from the groove 11 is discharged to the outside so as to ride on the upper surface of the scraper 16 and be pushed out. When the sheave 5 rotates counterclockwise, the loose load is scraped out by the scraper 16 on the left side of FIG. 9 and discharged to the outside.

  Since the contact portion 21 of the scraper 16 is disposed in the vicinity of the boundary b in the range P2 in which the opening / closing rope 6 is not fitted, there is almost no possibility that a loose load enters between the scraper 16 and the boundary b. As a result, most of the loose load can be scraped out by the scraper 16 before being compressed between the opening and closing rope 6, which is advantageous for maintaining the state of the groove 11 of the sheave 5 well. Further, the scraper 16 is arranged on both sides in the radial direction of the sheave 5, so that even if the sheave 5 rotates in any direction, the loose load can be scraped out before being compressed by the opening and closing rope 6.

  You may make it the structure which installs the axial part 20 of the scraper 16 in the side wall part 12 grade | etc., In the state which can rotate centering on the axial direction c. According to this configuration, the contact portion 21 can tilt about the axial direction c of the shaft portion 20. That is, the contact portion 21 can move in the vertical direction with respect to the groove portion 11 of the sheave 5.

  The contact portion 21 of the scraper 16 can be passively approached and separated from the groove portion 11. Therefore, for example, when an external force exceeding a predetermined value is generated in the scraper 16 due to loose load adhering to the groove portion 11, the contact portion 21 moves upward and is separated from the bottom surface 17 by the tilting of the scraper 16. As a result, the scraper 16 can suppress the rotational resistance applied to the sheave 5 to a predetermined value or less while scraping the loose load in the groove 11. Since the scraper 16 does not impede rotation by applying a rotational resistance larger than a predetermined value to the sheave 5, it is advantageous for improving the conveyance efficiency of loose loads.

  The contact portion 21 of the scraper 16 may be configured to actively approach and separate from the groove portion 11. According to this configuration, it is possible to control the balance between the amount of bulk load accumulated in the groove 11 and the rotational resistance applied to the sheave 5 by the scraper 16. By bringing the contact portion 21 closer to the bottom surface 17 of the groove portion 11, more bulk load can be scraped out from the groove portion 11. By separating the contact portion 21 from the bottom surface 17, it is possible to suppress resistance given to the rotation of the sheave 5 while scraping a loose load to some extent.

  Similarly to the above, in the embodiment illustrated in FIG. 7, a moving mechanism is installed between the scraper 16 and the beam portion 15, and the end portion of the scraper 16 is actively or passively approached and separated from the bottom surface 17 of the groove portion 11. You may make it the structure to carry out. The moving mechanism only needs to have a function of moving the end portion of the scraper 16 in the up and down direction, and can be constituted by, for example, a fluid cylinder or a spring mechanism that expands and contracts in the up and down direction.

  As illustrated in FIG. 11, the tip of the contact portion 21 of the scraper 16 may be bent and brought into contact with the groove portion 11. In this embodiment, the scraper 16 is formed in a substantially L shape in a vertical cross section perpendicular to the axial direction c of the shaft portion 20. A shaft portion 20 of the scraper 16 is disposed inside a pair of opening and closing ropes 6 extending upward from the sheave 5, and the scraper 16 extends outward from the shaft portion 20 and bends downward at an end portion. A contact portion 21 is provided.

  In this embodiment, two scrapers 16 are arranged above the sheave 5, and each contact portion 21 is in a range P <b> 2 in which the open / close rope 6 is not fitted, and a boundary with the range P <b> 1 in which the open / close rope 6 is fitted. Each is in contact with the groove 11 in the vicinity of b. Since it becomes easy to arrange the contact portion 21 closer to the boundary b, it is advantageous for suppressing the amount of loose load compressed between the groove portion 11 and the opening / closing rope 6.

  Since the shaft portion 20 can be disposed between the pair of opening / closing ropes 6, contact between the scraper 16 and the opening / closing rope 6 can be avoided even when the contact portion 21 of the scraper 16 approaches the boundary b. Since the open / close rope 6 does not hurt when it comes into contact with the scraper 16, it is advantageous for realizing a long life of the open / close rope 6. The contact portion 21 of the scraper 16 may be configured to approach or separate from the groove portion 11 actively or passively so as to be tiltable about the shaft portion 20.

  As illustrated in FIG. 12, the sheave 5 may be arranged at a position away from the structure 3. Even if the amount of loose load accumulated between the opening / closing rope 6 and the bottom surface 17 increases as the bottom surface 17 of the groove 11 moves away from the structure 3 as illustrated in the right side of FIG. It is possible to make it difficult to bite between the structure 3 and the bulk load.

  At this time, the distance h1 from the bottom surface 17 to the opposing structure 3 is set to 140% or more and 180% or less of the diameter R of the opening / closing rope 6. Desirably, it is set to 150% or more and 170% or less. The distance h2 from the top 22 of the groove 11 to the structure 3 is set to 90% or less of the diameter R of the opening / closing rope 6. Desirably, it is set to 50% or less.

  According to this configuration, it is possible to increase an allowable amount of loose loads accumulated in the groove 11 while preventing the opening / closing rope 6 from being detached from the groove 11. When the distance h2 is larger than 90% of the diameter R, the opening / closing rope 6 is easily bitten between the top portion 22 and the structure 3, and in some cases, the opening / closing rope 6 passes between the top portion 22 and the structure 3. The open / close rope 6 comes off the sheave 5.

  If the distance h1 is smaller than 140% of the diameter R, the allowable amount of loose load accumulated in the groove 11 cannot be increased so much. If the depth of the groove 11, that is, the distance from the bottom surface 17 to the top 22 is constant, and the distance h 1 is 180% or less of the diameter R, the distance h 2 is proportionally reduced and the opening / closing rope 6 is detached from the sheave 5. It is advantageous because it becomes difficult. When the distance h2 is constant, if the distance h1 is 180% or less of the diameter R, it is advantageous because the groove portion 11 becomes shallow and the loose load adhering in the groove portion 11 can be easily discharged to the outside by the scraper 16.

  When the rope disengagement stopper 18 is installed in the vicinity of the sheave 5, the distance h1 can be made larger than 180% of the diameter R of the opening and closing rope 6 and the distance h2 can be made larger than 90% of the diameter R. The rope detachment stop 18 can increase the allowable amount of loose load accumulated in the groove portion 11 while preventing the opening / closing rope 6 from being detached from the groove portion 11.

  The scraper 16 is not limited to the sheave 5 around which the open / close rope 6 is hung, and can be installed in other sheaves installed in the grab bucket 1. For example, the scraper 16 can be installed with respect to the sheave 5a disposed in the lifting portion 7 illustrated in FIG.

  The configuration of the grab bucket 1 is not limited to the configuration illustrated in FIG. If it is a grab bucket which conveys a bulk load and has a sheave, the effect can be obtained by applying the present invention. The configuration of the housing 10 is not limited to the configuration illustrated in FIG. Any configuration may be used as long as the sheave can be disposed inside and the scraper can be disposed.

1 Grab bucket 2 Opening / closing part 3 Supporting part (structure)
4 Support pin 5 Sheave 5a Sheave 6 Opening and closing wire rope (opening and closing rope)
7 Lifting part 8 Lifting wire rope (lifting rope)
9 Arm portion 10 Housing 11 Groove portion 12 Side wall portion 13 Auxiliary wall portion 14 Rotating shaft 15 Beam portion 16 Scraper 17 Bottom surface 18 Rope detachment prevention 19 Through hole 20 Shaft portion 21 Contact portion 22 Top portion P1 Rope fitting range P2 Rope fitting Range b not included Boundary c Axis direction h1 Distance h2 Distance R Diameter

Claims (6)

A pair of opening and closing parts that accommodate and convey the object to be conveyed, a support part that pivotally supports the pair of opening and closing parts, and a disk-shaped disk that is rotatably installed on the support part and is wrapped around a rope. A grab bucket comprising a sheave, a groove formed on a circumferential surface of the sheave and guided by the rope being fitted in a circumferential direction, wherein at least a part of the sheave is exposed. In
A grab bucket comprising a scraper at a predetermined position in a range where the rope does not fit in the groove.   2. The grab bucket according to claim 1, further comprising a pair of rope detachment stoppers disposed in a state in which the sheave is sandwiched from both sides in the rotation axis direction within a range in which the rope is fitted in the groove portion.   The grab bucket according to claim 2, wherein the rope detachment stopper is configured to be intermittently disposed along a circumferential direction of the sheave.   The distance from the bottom surface of the groove portion to the structure constituting the support portion facing the bottom surface is configured to be 140% or more of the diameter of the rope, and from the top portion of the groove portion to the structure body facing the top portion. The grab bucket according to claim 1, wherein the distance is configured to be 90% or less of the diameter of the rope.   The grab bucket according to any one of claims 1 to 4, wherein the scraper is configured in the vicinity of a boundary between a range in which the rope is not fitted in the groove portion and a range in which the rope is fitted.   An unloader comprising the grab bucket according to claim 1.

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