JP2019172385A - Over-winding detecting weight of crane - Google Patents

Abstract

To provide an over-winding detecting weight capable of being arranged around a hanging rope suspended from a crane jib or being removed by a simple work.SOLUTION: An over-winding detecting weight comprises a weight body 40, a detachable member 50 and a fastener. The weight body 40 has an inner circumferential face 41 surrounding partially a hanging rope, and a pair of end faces 45 sandwiching a rope passage-allowable space 75. The detachable member 50 has a pair of opposing side faces 55 capable of facing the pair of end faces 45 respectively, and is attached to and detached from the weight body 40 so as to close the rope passage-allowable space 75. The opposing side face 55 has a detachable side unevenness part 54 and the end face 45 has a body side unevenness part 44 to fit into the detachable side unevenness part 54 in the fitting direction. The weight body 40 includes a supporting face 44a and prevents the detachable member 50 from falling off from the weight body 40 because the supporting face 44a abuts to a downward supported face 54a included in the detachable member 50. A fastener mutually fastens a fastened part 46 of the weight body 40 and a fastened part of the detachable member 50 at the off-position from the supported face 54a and from the supporting face 44a.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a weight suspended from a jib in order to detect overwinding of a suspended load rope hanging from the jib of a crane.

  2. Description of the Related Art Conventionally, a means using a weight is known as means for detecting an overwinding of a suspended load rope hanging from a crane jib (including a so-called boom). The weight is suspended from the jib separately from the suspended load rope while being arranged around the suspended load rope, and comes into contact with the suspended load when the suspended rope is hoisted excessively. Enables detection of overloading of a suspended load rope.

  As such an overwinding detection weight, one shown in FIG. 4 of Patent Document 1 is known. The weight includes a weight body that is suspended from the jib of the crane, and a block that is attached to and detached from the weight body. The weight main body has a substantially cylindrical shape surrounding the through hole, and a suspended rope is inserted through the through hole. The weight main body has a shape in which a part in the circumferential direction is a notch, and the through hole is opened laterally through the notch. The suspended rope can pass through the cutout portion in a suspended state, and the weight main body can be arranged around the suspended rope. The block is detachably attached to the weight body so as to close the notch. Specifically, the block is fastened to the weight body by a pair of upper and lower bolts and nuts attached thereto. The pair of bolts penetrates the block and portions of the weight main body located on both sides of the block in the horizontal direction, and nuts are fastened to the pair of bolts, respectively. Thereby, the block is fixed to the weight main body by the bolt at the upper and lower positions.

JP-A-5-178579

  In the weight described in the said patent document 1, the subject that the operation | work which attaches / detaches the said block which is an attachment / detachment member with respect to the said weight main body is not easy. Specifically, when detaching the block from the weight body, if the pair of bolts are removed, the block will drop from the weight body due to its own weight. For example, the holding operation and the bolt removing operation must be performed simultaneously. Accordingly, it is necessary for the operator to perform the two operations with one hand, or to be accompanied by another auxiliary worker for holding the block. Conversely, when the block is mounted on the weight main body, it is necessary to insert a bolt while supporting the block at a position in the notch, which is accompanied by the same difficulty as the above-described detaching operation.

  In view of such circumstances, the present invention is a weight for preventing overwinding of a crane, which is arranged around a suspended rope suspended from a jib and can be easily removed. The purpose is to provide.

  Provided is a weight for detecting an overwinding of a suspended load rope hanging from a jib of a crane, and a weight body disposed around the suspended load rope and suspended from the jib. An attachment / detachment member that is detachably attached to the weight body, and a fastener that fastens the attachment / detachment member to the weight body. The weight main body includes a pair of inner peripheral surfaces that partially surround the suspended rope over a range of 180 ° or more and a pair of positions located on both sides of the weight main body with a rope passage-permissible space in between. And the rope passage-permissible space is between an external space that is an external space of the weight body and an internal space surrounded by the inner peripheral surface while the suspended rope is suspended. The external space and the internal space are communicated with each other in the radial direction of the weight body so as to allow entry and exit through the rope passage allowable space. The detachable member has a shape that can be attached to the weight body so as to block the rope passage allowable space, and includes a pair of opposed side surfaces that can respectively face the pair of end surfaces. Have The pair of opposed side surfaces have a detachable side concavo-convex portion that concavo-convex in the normal direction, and the pair of end surfaces slide relative to the weight main body along the specific fitting direction of the pair of detachable members. The detachable side uneven portion and the main body side uneven portion fitted in the fitting direction are provided so as to allow movement. The detachable member has a supported surface that is opened downward, and the weight body is opened upward so that the detachable side uneven portion and the main body side uneven portion are engaged with the supported surface in the vertical direction. It has a support surface that prevents the detachable member from falling off the weight body by abutting. The weight main body and the detachable member are arranged at a position apart from the supported surface and the support surface in a fitting completion state in which the detachable side uneven portion and the main body side uneven portion are completely fitted. Are received and fastened to each other by the fasteners.

  The overwinding detection weight can be easily and safely disposed around the hanging rope and can be removed from the hanging rope. Specifically, it is as follows.

  While the weight body is in a state where the suspended rope is suspended from the jib, the suspended rope is moved from the external space to the internal space, that is, the weight through the rope passage allowable space between the pair of end surfaces of the weight body. It can be received in a space surrounded by the inner peripheral surface of the main body, and can be easily arranged around the suspended rope. Furthermore, in the fitting completion state in which the detachable side uneven portion of the pair of end faces and the main body side uneven portion of the pair of opposing surfaces of the detachable member are completely fitted, the detachable member and the weight body to be fastened Are fastened by the fasteners, so that the detachable member can be fixed to the weight body so as to block the rope passage allowable space. Here, the support surface and the support surface are in contact with each other in a state where the detachable side uneven portion and the main body side uneven portion are fitted, so that the fastening portion is fastened by a fastener regardless of whether or not the fastening portion is fastened. Since the fall of the detachable member from the weight body, that is, the downward drop is prevented, the operator does not need to hold the detachable member to prevent the detachable member from falling, and the fastened parts by the fasteners Can be easily and safely performed.

  Conversely, in a state where the detachable member is mounted on the weight body, the fastener is removed from the fastened portion, and then the detachable member is removed from the weight body along the fitting direction. Accordingly, it is possible to remove the weight main body from the suspended load rope so that the suspended load rope is pulled out from the inner space to the outer space through the rope passage allowable space while being suspended. Here, even if the fastener is removed, the contact between the supported surface and the support surface prevents the detachable member from falling off the weight body. As in the case of work, it is possible to easily and safely remove the fastener without having to hold the detachable member to prevent the detachable member from falling.

  It is preferable that the supported surface is included in the detachable side uneven portion, and the support surface is included in the main body side uneven portion. This makes it possible to include the supported surface and the support surface in the detachable member and the weight main body, respectively, with a simple configuration using the detachable side uneven portion and the main body side uneven portion, respectively.

  In the weight, the fitting direction is a vertical direction, and the detachable side uneven portion and the main body side uneven portion are mutually connected as the detachable member descends from the position above the weight main body. It is preferable that it has a shape to be fitted, and the supported surface and the support surface are in a position where they face each other in the vertical direction at the position where the fitting is completed. The fitting between the detachable side uneven portion and the main body side uneven portion along the vertical direction can be reliably maintained by the weight of the detachable member. In other words, the contact between the supported surface and the support surface is reliably maintained by the weight of the detachable member.

  In this case, it is preferable that the detachable-side uneven portion and the main-body-side uneven portion have a shape that fits so as to regulate the relative displacement in the horizontal direction within a region extending in the vertical direction. This also makes it possible to regulate the relative rotational movement of the detachable member around the horizontal axis with respect to the weight main body to further stabilize the fitting state.

  Specifically, the main body side uneven portion includes a convex portion that continuously or intermittently exists in a region extending in the vertical direction, and the detachable side uneven portion is opened downward and inserted from below the convex portion. A top surface that closes the upper end of the concave portion of the detachable side uneven portion constitutes the supported surface, and the upper end surface of the convex portion What constitutes the support surface is preferred.

  In this case, it is preferable that the to-be-fastened part is located below the convex part of the main body side uneven part. This means that the position where the supported surface is supported by the support surface and the position where the fastening by the fastener is performed are largely separated in the vertical direction, and the detachable member is fixed to the weight body in a more stable state. Allows to be done.

  Alternatively, the detachable side uneven portion includes a convex portion that continuously or intermittently exists in a region extending in the vertical direction, and the main body side uneven portion is opened upward to accept insertion from above the convex portion. The lower end surface of the convex portion constitutes the supported surface, and the bottom surface of the main body side uneven portion closes the lower end of the concave portion. It may be configured.

  In this case, it is preferable that the said to-be-fastened part is located above the said convex part of the said attachment / detachment side uneven part. This also means that the position where the supported surface is supported by the support surface and the position where the fastening by the fastener is performed are largely separated vertically, and the detachable member is fixed to the weight body in a more stable state. Allows to be done.

  In the weight, the fitting direction is a direction parallel to a radial direction of the weight main body, and the detachable side uneven portion and the main body side uneven portion have the detachable member attached to the weight main body. You may have a shape which mutually fits with the movement which goes to the inner side from the position of the radial direction outer side. The fitting accompanying the radially inward movement of the detachable member with respect to the weight body is performed even when a part of the suspended load rope protrudes from the internal space into the rope passage allowable space. Using the fitting operation of the detachable member, the suspended load rope can be pushed into the internal space by the detachable member.

  The fastener includes a bolt, and the fastened portion of the detachable member passes through the detachable member in a specific horizontal direction that is a horizontal direction orthogonal to the radial direction of the weight body to allow the bolt to be inserted. A detachable side bolt insertion hole, and the fastened portion of the weight main body with respect to the fastened portion of the detachable member in a state where the fitting between the detachable side uneven portion and the main body side uneven portion is completed. What has the main body side bolt insertion hole which adjoins the said attachment / detachment side bolt insertion hole and accept | permits the insertion of the said bolt while adjoining a specific horizontal direction is suitable. The fastened portions of the detachable member and the weight main body do not hinder the opening of the rope passage allowable space when the detachable member is detached from the weight main body, and the rope passage allowable It is possible to efficiently fasten the detachable member and the weight main body while the bolt crosses the rope passage allowable space with the detachable member closing the space.

  As described above, according to the present invention, there is a weight for preventing over-winding of a crane, which is arranged around a suspended load rope suspended from a jib and can be easily removed. Provided.

It is a front view which shows an example of the crane with which the overwinding detection weight which concerns on each embodiment of this invention is equipped. It is a front view which expands and shows the state in which the wire rope and the overwinding detection weight were suspended from the boom of the crane. FIG. 3 is a perspective view showing the overwinding detection weight according to the first embodiment of the present invention before a bolt is attached. It is a top view which shows the state of FIG. It is a side view which shows the state of FIG. FIG. 4 is a front view showing the overwinding detection weight shown in FIG. 3 and a state after a bolt is mounted. It is a side view which shows the cross section along the VII-VII line of FIG. FIG. 4 is a perspective view showing a weight main body of the overwinding detection weight shown in FIG. 3. It is a top view of the weight main body shown by FIG. It is a front view of the weight main body shown by FIG. It is a perspective view which shows the attachment or detachment member of the overwinding detection weight shown by FIG. It is a front view which shows the process in which the said attachment / detachment member is attached or detached with respect to the said weight main body of the said weight for an overwinding detection shown by FIG. It is a side view which shows the cross section along the XIII-XIII line | wire of FIG. It is a front view which shows the process by which the said volt | bolt is attached / detached with respect to the said weight main body and said attachment / detachment member of the overwound detection weight shown by FIG. It is a side view which shows the cross section along the XV-XV line | wire of FIG. It is a cross-sectional side view of the overwinding detection weight according to the second embodiment of the present invention, and is a side view showing a cross section corresponding to the cross section along the line VII-VII in FIG. FIG. 17 is a front view showing a process in which a detachable member is attached to and detached from a weight main body of the overwinding detection weight shown in FIG. 16. It is a side view which shows the cross section along the XVIII-XVIII line | wire of FIG. It is a front view of the overwound detection weight which concerns on the 3rd Embodiment of this invention. FIG. 20 is a plan view showing a process of attaching / detaching a detachable member to / from the weight main body of the overwinding detection weight shown in FIG. 19. It is a front view of the overwinding detection weight which concerns on the 4th Embodiment of this invention. It is a top view which shows the process in which an attachment or detachment member is attached or detached with respect to the weight main body of the weight for an overwinding detection shown by FIG. It is a weight for overwinding detection concerning the 5th Embodiment of this invention, Comprising: It is a perspective view which shows the state before mounting | wearing with a volt | bolt. It is a perspective view which shows the principal part of the attachment or detachment member of the overwound detection weight shown by FIG. It is a perspective view which shows the principal part of the weight main body of the weight for overwinding detection shown by FIG. It is a weight for overwinding detection concerning the 6th Embodiment of this invention, Comprising: It is a perspective view which shows the state before mounting | wearing with a volt | bolt. It is a front view of the overwinding detection weight which concerns on the 7th Embodiment of this invention.

  Preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 collectively refer to the overwinding detection weights W1, W2, W3 (hereinafter referred to as “overwinding detection weight W”) according to the respective embodiments of the present invention. A crawler crane which is an example of a crane equipped with W.) is shown. The crawler crane is a crawler type lower traveling body 1, an upper revolving body 2 that is turnably mounted on the lower traveling body 1, and a jib that is attached to a front portion of the upper revolving body 2 so as to be raised and lowered. A boom 3, a boom hoisting device for raising and lowering the boom 3, a suspended load driving device for raising and lowering a suspended load, and an overwinding detection device 20 including the overwinding detection weight W are provided.

  The upper revolving unit 2 includes a revolving frame 2b supported by the lower traveling unit 1 and a cab 2a mounted on the revolving frame 2b. The boom 3 has a base end portion connected to the revolving frame 2b so as to be rotatable about a horizontal axis, and a distal end portion on the opposite side.

  The boom drive device includes a gantry 6, a lower spreader 7, an upper spreader 5, a boom guy line 4, a wire rope 8, and a boom hoisting winch 9. The gantry 6 is erected at the rear part of the revolving frame 2b. The lower spreader 7 includes a plurality of sheaves and is attached to the top of the gantry 6. The upper spreader 5 includes a plurality of sheaves and is connected to the tip of the boom 3 through the boom guy line 4. The wire rope 8 is wound around the drum of the boom hoisting winch 9 and is stretched between the plurality of sheaves of the lower spreader 7 and the plurality of sheaves of the upper spreader 5. The boom hoisting winch 9 is mounted on the revolving frame 2b, and when the wire rope 8 is wound and unwound, the distance between the lower spreader 7 and the upper spreader 7 is changed to raise and lower the boom 3. Let

  The hanging load driving device includes a boom point sheave 11, an idler sheave 12, an auxiliary sheave 13, a main hook 14, a main winding wire rope 15, a supplementary hook 16, a supplement winding wire rope 17, and a main winding winch. 18 and auxiliary winding winch 19. As shown in an enlarged view in FIG. 2, each of the sheaves 11 to 13 is rotatably attached to the tip portion of the boom 3.

  The main hook 14 is used to suspend a relatively heavy suspended load, and is suspended from the boom point sheave 11 via the main wire rope 15 that is a suspended load rope. The main winding wire rope 15 is wound around the drum of the main winding winch 18 and is suspended between the boom point sheave 11 and the main hook 14 and hangs down from the boom point sheave 11. The main winding winch 18 is mounted on the revolving frame 2b, and moves up and down the main hook 14 by winding and unwinding the main winding wire rope 15. That is, the main hook 14 is wound and unwound through the main wire rope 15.

  The auxiliary hook 16 is used to suspend a load having a relatively small weight, and is suspended from the auxiliary sheave 13 via the auxiliary winding wire rope 17. The auxiliary wire rope 17 is wound around the drum of the auxiliary winding winch 19 and is hung on the idler sheave 12 and the auxiliary sheave 13 and hangs down from the auxiliary sheave 13. The auxiliary winding winch 19 is mounted on the revolving frame 2b, and raises and lowers the auxiliary hook 16 by winding and unwinding the auxiliary winding wire rope 17. That is, the auxiliary hook 16 is wound and lowered through the auxiliary wire rope 17.

  The overwinding detection device 20 is a device for detecting excessive winding of the main hook 14, and includes the overwinding detection weight W, the limit switch 22, and the overwinding detection wire rope 24. Including. The overwinding detection weight W is disposed around a portion of the main winding wire rope 15 that hangs down from the boom point sheave 11, and is attached to the boom 3 via a suspension wire rope (not shown). The main hook 14 is hung independently from the main hook 14 and is maintained at a preset normal height position. The limit switch 22 is fixed to an appropriate part of the boom 3 and connected to the overwinding detection weight W via the overwinding detection wire rope 24. The overwinding detection wire rope 24 has such a length as to be stretched when the overwinding detection weight W is in the normal height position. The limit switch 22 outputs an overwinding detection signal in response to the occurrence of slack in the overwinding detection wire rope 24.

  The normal height position of the overwinding detection weight W is such that when the main hook 14 is excessively wound, the main hook 14 comes into contact with the overwinding detection weight W and pushes it up. Is set to the correct position. Accordingly, the overwinding detection signal is output from the limit switch 22 in response to the overwinding detection wire rope 24 being loosened by the lifting of the overwinding detection weight W due to the overwinding of the main hook 14. Is output. The overwinding detection signal is input to a controller (not shown), and the controller performs appropriate overwinding prevention control (for example, automatic stop of main winding driving) based on the overwinding detection signal.

  In the example shown in FIG. 2, the overwinding detection device 30 is also attached to the auxiliary winding hook 16, and the overwinding prevention device 30 includes the limit switch 22, the overwinding prevention wire rope 24, and the overwinding. A limit switch 32, an overwinding prevention wire rope 34, and an overwinding detection weight 36, each of which plays the same role as the detection weight W, are included.

  The overwinding detection weight according to the present invention may be applied to the overwinding detection weight 36 for the auxiliary winding hook 16. Moreover, the kind and concrete structure of the crane to which the overwinding detection weight according to the present invention is applied are not limited. The present invention can be applied to any mobile crane (for example, a wheel crane) other than the crawler crane as shown in FIG. 1 or a fixed crane. Further, the jib on which the overwinding detection weight according to the present invention is suspended is not limited to the boom as shown in FIG. 1, and may be an auxiliary jib connected to the tip of the boom.

  Next, the overwinding detection weight according to each embodiment of the present invention will be described with reference to FIGS.

  3 to 15 show an overwinding detection weight W1 according to the first embodiment of the present invention. The overwinding detection weight W1 includes a weight main body 40, a detachable member 50, and a fastener 60.

  The weight body 40 is disposed around the main wire rope 15 and is suspended from the tip of the boom 3 via the suspension wire rope (not shown). The weight main body 40 according to this embodiment has a shape obtained by cutting a part in the circumferential direction of a cylindrical body having a certain thickness. Specifically, the weight body 40 includes an inner peripheral surface 41 and an outer peripheral surface 42 that are arc-shaped in plan view, and a pair of end surfaces 45 that are opposed to each other with the rope passage allowable space 75 interposed therebetween.

  The inner peripheral surface 41 has a shape that partially surrounds the main wire rope 15 over a range of 180 ° or more (in the example shown in FIG. 4, a range of about 270 °). In other words, the inner circumferential surface 41 partially surrounds the inner space 71 in the circumferential direction, and allows the main winding wire rope 15 to be inserted into the inner space 71. The inner diameter is larger than the outer diameter. The rope passage allowance space 75 is formed in a partial region in the circumferential direction of the weight body 40, and the internal space 71 passes through the rope passage allowance space 75, that is, the external space 72 outside the weight body 40, that is, , Communicated with a space radially outward from the outer peripheral surface 42. The rope passage allowance space 75 has a width larger than the outer diameter of the main winding wire rope 15, and the rope passage allowance is maintained while the main winding wire rope 15 is suspended from the tip of the boom 3. The internal space is allowed to pass through the space 75 in the horizontal direction (a direction parallel to the radial direction of the weight body 40) and to enter and exit between the internal space 71 and the external space 72 in the horizontal direction. 71 communicates with the external space 72.

  The inner peripheral surface 41 and the outer peripheral surface 42 are not necessarily cylindrical. The inner peripheral surface 41 only needs to have a size that allows a suspended load rope (the main wire rope 15 in this embodiment) to be inserted therein, and the outer peripheral surface 42 is the inner peripheral surface 41. It is only necessary to have a larger outer diameter. The shape of the inner peripheral surface 41 and the outer peripheral surface 42 in plan view may be, for example, a polygon (including a triangle or a quadrangle), an ellipse, or another curved line.

  The weight body 40 further has a pair of suspended portions 43. The pair of suspended portions 43 protrude from the upper surface of the weight body 40 and have a shape that can be engaged with the lower end of the suspension wire rope. Specifically, the pair of suspended portions 43 each have a through hole 43a that receives the lower end of the hanging wire rope.

  The pair of end surfaces 45 are surfaces which are located on both sides of the rope passage allowable space 75 and are opposed to each other. The end surface 45 according to this embodiment is a surface parallel to the central axis 75x of the rope passage allowable space 75 shown in FIGS. That is, the pair of end surfaces 45 are parallel to each other. However, the end surface 45 may be a surface inclined with respect to the central axis 75x of the rope passage allowable space 75 in plan view, for example, a surface parallel to the radial direction of the weight body 43.

  The detachable member 50 is detachably attached to the weight body 40 so as to close the rope passage allowable space 75. The detachable member 50 according to this embodiment has a block shape having an outer shape corresponding to the shape of the rope passage allowable space 75 and can be opposed to the pair of end surfaces 45 of the weight body 40. Having opposite side surfaces 55.

  As a feature of the overwound detection weight W1, the pair of opposed side surfaces 55 are respectively in a specific horizontal direction perpendicular to the normal direction thereof, that is, the radial direction of the weight W1 (FIGS. 4, 12, and 14). And a detachable side uneven portion that is uneven in the left-right direction). Each of the pair of end faces 45 has a main body side uneven portion that is uneven in the normal direction, that is, in the specific horizontal direction. The main body side uneven portion allows the detachable member 50 to slide relative to the weight main body 40 along a specific fitting direction (vertical direction in this embodiment). The detachable side uneven portion is fitted in the fitting direction.

  Specifically, the detachable side uneven portion according to this embodiment includes a recessed portion that is recessed along the normal direction, more specifically, a recessed groove 54 as shown in FIG. The concave groove 54 extends in the vertical direction, and has a closed upper end and a lower end opened downward. On the other hand, each of the main body side uneven portions includes a convex portion that can be fitted into the concave portion, more specifically, a protrusion 44 as shown in FIGS. The protrusion 44 extends in the vertical direction and has a shape that can be inserted into the concave groove 54 from below.

  The detachable side uneven portion of the detachable member 50 includes a top surface 54a that closes the upper end of the concave groove 54, and the top surface 54a constitutes a supported surface that is opened downward. On the other hand, the upper end surface 44a of the protrusion 44 included in the main body side uneven portion of the weight main body 40 constitutes a support surface opened upward. The upper end surface 44a, which is the support surface, comes into contact with the top surface 54a in the vertical direction when the concave groove 54 and the protrusion 44 are completely fitted, and from the weight body 40. The detachable member 50 is prevented from falling off. That is, the protrusion 44 and the concave groove 54 have a shape that fits to each other as the detachable member 50 descends from the position above the weight main body 40, and the top surface 54a. And the said upper end surface 44a of a protrusion contact | abuts mutually in the up-down direction in the position where the said fitting was completed.

  The weight body 40 has a pair of fastened portions 46, and the detachable member 50 has fastened portions 56 corresponding to the pair of fastened portions 46. The to-be-fastened portion 56 is at a height position so as to be sandwiched by the pair of fastened portions 46 from the left and right sides in the fitting completion state. The fastening portions 56 can be fastened to each other by the fastener 60.

  Specifically, in the overwinding detection weight W1 according to this embodiment, the recess 47 is formed at a position slightly apart from the rope passage allowable space 75 to the left and right outer sides at the lower end portion of the weight body 40. The portions sandwiched between the rope passage allowable space 75 and the pair of recesses 47 constitute the fastened portion 46. Each of the fastened portions 46 is formed with a bolt insertion hole 46a that penetrates the fastening portion 46 in a specific horizontal direction (left-right direction) orthogonal to the radial direction of the weight main body 40. On the other hand, the fastened portion 56 is a portion of the detachable member 50 that is sandwiched between the pair of fastened portions 46 in the fitting completion state, that is, a lower end portion of the detachable member 50, and is fastened. The part 56 is also formed with a bolt insertion hole 56a that passes through the portion 56 in the specific horizontal direction (left-right direction) (detachable side). The pair of bolt insertion holes 46a and the bolt insertion holes 56a are formed at positions that match each other in the fitting completion state, that is, positions that are adjacent to each other in the specific horizontal direction.

  The fastener 60 includes a bolt 62 and a nut 64 that can be attached to the tip of the bolt 62. The bolt 62 has an outer diameter that can be inserted into the bolt insertion holes 46a, 56a, 46a that coincide with each other when the fitting is completed. The nut 64 can be screwed onto the tip of the bolt 62 inserted into the bolt insertion holes 46a, 56a, 46a. By this screwing, the fastener 60 fastens the fastened portions 46 and 56 to each other in the specific horizontal direction with the fastened portion 56 sandwiched between the pair of fastened portions 46. . In other words, the pair of fastened portions 46 and the fastened portion 56 are supported by receiving the bolts 62 so that the bolts 62 penetrate through the fastened portions 46 and 56 in the specific horizontal direction. The top surface 56a, which is a surface and a support surface, and the upper end surface 44a of the ridges can be fastened to each other in the specific horizontal direction at positions spaced downward.

  The fastener 60 may be configured only by the bolt 62. For example, when one of the pair of bolt insertion holes 46 a of the weight body 40 is a screw hole that can be screwed with the bolt 62, the nut 64 is unnecessary.

  The overwinding detection weight W1 according to this embodiment is arranged around the main winding wire rope 15 and removed from the main winding wire rope 15 by a simple operation as described below, for example. Is possible.

(A) Arrangement around the main wire rope 15 The weight main body 40 is positioned between the pair of end surfaces 45 of the weight main body 40 while the main wire rope 15 is suspended from the jib (more Specifically, the main wire rope 15 is received from the outer space 72 into the inner space 71, that is, the space surrounded by the inner peripheral surface 41 of the weight main body 40 through the rope passage allowable space 75 between the side surfaces of the protrusions 44. Is possible. By this acceptance, it can be easily arranged around the main wire rope 15 in the suspended state.

  Next, as shown in FIGS. 12 and 13, the detachable member 50 is inserted from the top to the bottom into the rope passage allowable space 75 sandwiched between the pair of end surfaces 45. At that time, the protrusions 44 included in the left and right end surfaces 45 of the weight main body 40 are inserted from below into the recessed grooves 54 respectively included in the left and right opposing side surfaces 55 of the detachable member 50 (that is, the recessed grooves 54 are The detachable side uneven portion of the facing side surface 55 and the main body side uneven portion of the end surface 45 are fitted to each other in the vertical direction. Then, as shown in FIGS. 14 and 15, the fitting is completed at a position where the upper end surface 44 a of the protrusion 44 abuts against the top surface 54 a that closes the upper end of the concave groove 54.

  In this fitting completion state, the fastened portion 56 of the detachable member 50 is positioned between the pair of left and right fastened portions 46 of the weight body 40, and the bolt insertion hole 56 a formed in the fastened portion 56 and The bolt insertion holes 46a formed in the pair of fastened portions 46 are aligned with each other so as to be adjacent to each other in the left-right direction (specific horizontal direction). The bolts 62 of the fasteners 60 are inserted into the bolt insertion holes 46a, 56a, 46a, and the nuts 64 are screwed onto the front ends of the bolts 62 so that the fastened portions 46, 56 are connected. They are fastened to each other in a specific horizontal direction, and the fixing of the detachable member 50 to the weight body 40 is completed. The detachable member 50 fixed in this way closes the rope passage allowance space 75, so that the main wire rope 15 is detached from the internal space 71 through the rope passage allowance space 75, in other words, The overwinding detection weight W1 is reliably prevented from detaching from the main wire rope 15 in the radial direction.

  The protrusion upper end surface 44a, which is the support surface of the weight body 40, comes into contact with the top surface 54a, which is the supported surface of the detachable member 50, in the vertical direction, thereby determining whether or not the fastener 60 is fastened. Regardless, the detachable member 50 is prevented from falling off from the weight main body 40 and the fitting state between the two is maintained. This eliminates the need for an operator to hold the detachable member 50 by hand in order to prevent the detachable member 50 from dropping during the fastening operation by the fastener 60, thereby making the fastening operation easy and safe. Allows to be done.

(B) Removal of the overwinding detection weight W1 from the main winding wire rope 15 The removal of the overwinding detection weight W1 from the main winding wire rope 15 is also easily performed by an operation reverse to the arrangement operation. It is possible to be Specifically, the bolt 62 of the fastener 60 shown in FIGS. 7 and 8 is extracted from the fastened portions 46 and 56 as shown in FIGS. 14 and 15, and then as shown in FIGS. When the detachable member 50 is extracted from the weight body 40 upward along the fitting direction, the rope passage allowable space 75 is opened. Accordingly, in this state, the weight main body 40 is removed from the main wire rope 15 so as to come out from the inner space to the outer space 72 through the rope passage allowable space 75 while the main wire rope 15 is in a suspended state. It can be removed. Here, even if the fastener 60 is removed, the contact between the top surface 54a and the upper end surface 44a of the protrusion prevents the detachable member 50 from falling off the weight body 40. Even if the work for holding the detachable member 50 is not performed, the work for removing the fastener 60 can be easily and safely performed.

  The fastening position at which the weight main body 40 and the detachable member 50 are fastened by the fastener 60 is such that the top surface 54a that is a supported surface and the ridge upper end surface 44a that is a supporting surface are vertically contacted. It suffices if it is in a position deviating from the abutting position where it comes into contact, but as in the above-described embodiment, the fastened portions 46 and 56 are located below the ridge 44 that is a convex portion of the main body side uneven portion. Is preferred. This means that the position at which the top surface 54a is supported by the upper end surface 44a of the ridge and the fastening position are greatly separated from each other in the vertical direction so that the detachable member 50 is attached to the weight body 40 only by a single bolt 62. Allows to be fixed in a stable state. However, the present invention is not intended to exclude an aspect in which the fastener includes a plurality of bolts.

  FIGS. 16-18 shows the overwinding detection weight W2 which concerns on the 2nd Embodiment of this invention. This overwinding detection weight W2 also includes a weight main body 40, an attaching / detaching member 50, and a fastener 60, which are attached to and attached to the weight main body 40 of the overwinding detection weight W1 according to the first embodiment. It has the same basic shape as the basic shape of the member 50 and the fastener 60, and the weight main body 40 and the detachable member 50 have a main body side uneven portion and an attachable / detachable side uneven portion, respectively, which are related to the first embodiment. The concavo-convex relationship is opposite to the concavo-convex relationship between the detachable side concavo-convex portion and the main body side concavo-convex portion.

  Specifically, the detachable side uneven portion of the detachable member 50 according to the second embodiment includes a ridge 58 protruding outward in a specific horizontal direction on each of the pair of opposed side surfaces 55, and each ridge. 58 extends in the vertical direction, and the protrusion 58 has a lower end surface 58a opened downward. On the other hand, the main body side uneven portion of the weight main body 40 according to the second embodiment includes a groove 48 that is recessed in a specific horizontal direction on each of the pair of end surfaces 45. The upper end of the concave groove 48 is opened, while the lower end is closed by the bottom surface 48 a, and the concave groove 48 accepts insertion from above the protrusion 58. That is, the protrusion 58 and the groove 48 can be fitted to each other so that the protrusion 58 is inserted into the groove 48 from above, and the fitting is completed. The bottom surface 48a abuts the lower end surface 58a of the protrusion 58 in the vertical direction.

  In the second embodiment, a portion of the weight main body 40 that is located on both the left and right sides of the rope passage allowable space 75 and that is located above the protrusion 58 in the fitting completion state, specifically The upper end portion of the weight main body 40 sandwiching the rope passage allowable space 75 is a pair of fastened portions 46 of the weight main body 40, and the fastened portion 46 is connected to the fastened portion 46 in the first embodiment. Similarly, the (main body side) bolt insertion hole 46a is formed. Similarly, a portion sandwiched between the pair of fastened portions 46 in the detachable member 50, that is, an upper end portion of the detachable member 50 is a fastened portion 56, and the fastened portion 56 is similar to the first embodiment. (Attachment / detachment side) bolt insertion hole 56a is formed. As in the first embodiment, the bolt insertion holes 46a and 56a are respectively formed at positions that are adjacent to each other in the specific horizontal direction in the fitted state.

  Also in the second embodiment, the lower end surface 58a and the bottom surface 48a function as a supported surface and a support surface that are in contact with each other in the up-down direction when the fitting is completed. Regardless of the presence or absence, the detachable member 50 is prevented from falling off from the weight main body 40 in the fitting completion state. This eliminates the need for the operator to hold the attaching / detaching member 50 by hand or the like when attaching / detaching the fastener 60, thereby making the attaching / detaching operation of the fastener 60 easy and safe. enable.

  Also in the second embodiment, the fastened portions 46 and 56 only need to be at a position away from the contact position where the projected lower end surface 58a and the bottom surface 48a which are the supported surface and the support surface contact each other. However, it is preferable that the said to-be-fastened parts 46 and 56 are located above the said protrusion 58 which is a convex part of an attaching / detaching side uneven | corrugated | grooved part as mentioned above. This also allows the attaching / detaching member 50 to be fixed to the weight body 40 in a more stable state by separating the contact position and the fastening position from each other up and down.

  The fitting direction according to the present invention, that is, the direction in which the detachable side uneven portion and the main body side uneven portion are fitted while allowing relative sliding is not limited to the vertical direction. The fitting direction may be, for example, a direction parallel to the radial direction of the weight body.

  19 and 20 show an overwinding detection weight W3 according to a third embodiment as an example. Similar to the first embodiment, the overwound detection weight W3 includes a weight body 40, a detachable member 50, and a fastener 60, and the weight body 40 protrudes at each of a pair of end surfaces 45. The detachable member 50 has a recessed groove 59A that is recessed in each of a pair of opposing side surfaces 55. The recessed groove 59A receives the insertion of the protruding protrusion 49A and the protruding protrusion 49A. It is possible to fit. However, the protrusion 49A and the concave groove 59A extend in the radial direction at an intermediate position in the height direction of the overwinding detection weight W3, and allow relative sliding in the radial direction with respect to each other in the radial direction. Mating.

  In the overwinding detection weight W3 according to the third embodiment, the top surface 59a defining the upper end of the recessed groove 59A of the detachable member 50 functions as a supported surface opened downward, The upper end surface 49a of each protrusion 49A of the weight main body 40 is opened upward and functions as a support surface that can come into contact with the supported surface. Accordingly, in the overwinding detection weight W3, the weight main body in the completed state is brought into contact with the top surface 59a and the upper end surface 49a in the vertical direction regardless of whether the fastener 60 is fastened. The attachment / detachment work of the fastener 60 can be facilitated by preventing the attachment / detachment member 50 from falling off the member 40.

  Furthermore, the radial fitting of the protrusion 49 and the concave groove 59 according to the third embodiment is advanced as the detachable member 50 moves inward in the radial direction with respect to the weight body 40. Therefore, even when the suspended load rope protrudes from the inner space 71 surrounded by the weight main body 40 into the rope passage allowable space 75, the main winding is utilized using the radial fitting operation of the detachable member 50. There is an advantage that the wire rope 15 can be pushed into the internal space 71 by the detachable member 50.

  This effect can also be obtained in the overwinding detection weight W4 according to the fourth embodiment shown in FIGS. This overwinding detection weight W4 has irregularities opposite to those of the overwinding detection weight W3. Specifically, the weight main body 40 of the overwinding detection weight W4 has a concave groove 49B that is recessed in each of the pair of end surfaces 45, and the detachable member 50 is a protrusion that protrudes in each of the pair of opposed side surfaces 55. 59B, and the protrusion 59B has a shape that is fitted in the groove 49B in the radial direction. In the overwound detecting weight W4, the lower end surface 59b of the protrusion 59B of the detachable member 50 functions as a supported surface opened downward, and the bottom surface of the concave groove 49B of the weight main body 40. 49b is opened upward and functions as a support surface that can come into contact with the supported surface.

  In contrast to the third and fourth embodiments, the vertical fitting of the detachable side uneven portion and the main body side fitting portion as shown in the first and second embodiments is performed on the detachable member. The self-weight has the advantage that the fitting is reliably maintained (that is, the contact between the supported surface and the supporting surface is reliably maintained).

  The advantage is that the horizontal and vertical grooves 44 and the concave groove 54 according to the first embodiment and the vertical and vertical grooves 58 and 48 according to the second embodiment are mutually horizontal in the region extending in the vertical direction. By having a shape that fits so as to regulate the relative displacement in the direction, it becomes even more prominent. For example, the “convex portion” according to the present invention is not limited to a shape extending in the vertical direction like the protrusions 44 and 58, and may be a normal protrusion having a circular cross section, for example. In some cases, even if the fitting is completed, the detachable member may rotate (including swinging) around the horizontal axis with respect to the weight main body around the projection. On the other hand, what is fitted so as to restrict relative displacement in the horizontal direction within the region extending in the vertical direction, such as the protrusion 58 and the concave groove 48, is the detachable member with respect to the weight main body 40. The relative rotational movement around the 50 horizontal axes can also be regulated to make the fitting state more stable. This effect is not limited to the protrusions that are continuous in the vertical direction, such as the protrusions 44 and 58, but, for example, a plurality of protrusions (also depending on the protrusions) that are intermittently arranged at a plurality of positions aligned in the vertical direction Can be obtained.

  The length and area of the protrusions 44 and 58 and the concave grooves 54 and 48 are not particularly limited. For example, the weight main body 40 and the detachable member 50 of the overwinding detection weight W5 according to the fifth embodiment shown in FIGS. 23 to 25 are the overwinding detection weight W5 according to the second embodiment. As in the case of the weight main body 40 and the detachable member 50, the groove main body 40 and the detachable member 50 have a recessed groove 48B and a protrusion 58B, respectively. It is limited to the upper end part. However, even in the case of the concave grooves 48B and the ridges 58B in which the formation region is extremely limited as described above, the detachable member 50 from the weight main body 40 is caused by the vertical contact between the bottom surface 48b and the lower end surface 58b. Can be prevented.

  Furthermore, the relative displacement in the radial direction of the detachable member 50 with respect to the weight main body 40 may not be restricted like the overwound detection weight W6 according to the sixth embodiment shown in FIG. 26, for example. . The detachable member 50 has a pair of convex portions 58C projecting left and right at the upper end portion as the detachable side concavo-convex portions, and the weight main body 40 has a pair of concave portions 48C into which the projecting portions 58C are respectively fitted at the upper end. The convex portion 58 </ b> C and the concave portion 48 </ b> C do not include a fitting that restricts the relative displacement in the radial direction of the detachable member 50 with respect to the weight main body 40. However, also in this overwinding detection weight W6, the lower end surface 58c of the protrusion 58C and the bottom surface 48c of the recess 48C can function as a supported surface and a support surface that can contact each other in the vertical direction. It is.

  Furthermore, the supported surface and the support surface according to the present invention may not be included in the detachable side uneven portion and the main body side uneven portion, respectively. An overwound detection weight W7 according to the seventh embodiment shown in FIG. 27 includes a weight body 40 having a pair of end surfaces 45 and a detachable member 50 having a pair of opposed side surfaces 55, and the opposed side surfaces. Reference numeral 55 denotes a not-shown detachable uneven portion (specifically, a groove or a ridge extending in the vertical direction), and a not-shown main body-side uneven portion that can be fitted to the detachable-side uneven portion on the end surface 45. (Specifically, a not-shown ridge or groove extending in the vertical direction) is formed, but the detachable side uneven portion and the main body side uneven portion are open in both the vertical direction and include the supported surface and the support surface. Not. Instead, the detachable member 50 has a convex portion 50A that protrudes left and right outward at its upper end, and the lower end surface 50a of the convex portion 50A functions as a supported surface, and the upper surface of the weight body 40 Of these, the portion in contact with the lower end surface 50a in the vertical direction functions as a support surface.

  The detachable member according to the present invention does not necessarily have an outer shape that completely matches the shape of the rope passage allowable space. The detachable member may be any member that closes the rope passage allowable space to the extent that it can prevent detachment of the suspended rope from the internal space to the external space through the rope passage allowable space. It may have a shape that immerses in or a shape that protrudes from the rope passage allowable space.

  In the present invention, the number of fasteners is not particularly limited. For example, the overwinding detection weights W1 and W2 according to the first and second embodiments are held in the weight main body 40 in a stable state by the weight of the attachment / detachment member 50 in the completed state. The member 50 has an advantage that only the single fastener 60 can be fixed to the weight body 40 in a sufficiently stable state. For example, in the third and fourth embodiments, the protrusions and recesses are fitted to each other. When the fitting gap is large (that is, when the looseness of the detachable member 50 with respect to the weight body 40 is large), the aspect in which the relative position of the detachable member with respect to the weight body is not stable in the fitted state, and high fastening strength is required. Where used, multiple fasteners may be used.

W, W1-W7 Overwinding detection weight 3 Boom (jib)
15 Main wire rope (suspended load rope)
20 Overwinding detection device 40 Weight body 40a Upper surface of weight body (support surface)
41 inner peripheral surface 42 outer peripheral surface 44 ridge 44a upper end surface (support surface) of ridge
45 End face 46 Fastened part 46a Bolt insertion hole (main body side bolt insertion hole)
48, 48B Concave groove 48C Concave part 48a, 48b, 48c Bottom surface (support surface)
49A ridge 49a Upper end surface (support surface) of ridge
49B Concave groove 49b Concave groove bottom surface (support surface)
49C Concavity 49c Concave bottom (support surface)
50 Detachable member 54 Concave groove 54a Top surface (supported surface)
55 Opposite side face 56 Fastened part 56a Bolt insertion hole (detachable bolt insertion hole)
58, 58B Projection 58a, 58b Lower end surface of projection (supported surface)
58C, 50A Convex part 58c, 50a Lower end surface of the convex part (supported surface)
59A Groove 59a Top surface (supported surface)
59B ridge 59b Lower end surface of ridge (supported surface)
60 Fasteners 62 Bolts 64 Nuts 65 Rope passage allowance space 71 Internal space 72 External space 75 Rope passage allowance space

Claims (10)

A weight for detecting overloading of a suspended load rope hanging from a jib of a crane,
A weight body disposed around the hanging rope and suspended from the jib;
A detachable member that is detachably attached to the weight body;
A fastener for fastening the detachable member to the weight body,
The weight main body includes a pair of inner peripheral surfaces that partially surround the suspended rope over a range of 180 ° or more, and a pair of positions located on both sides of the weight main body with a rope passage-permissible space in between. And the rope passage-permissible space is between an external space that is an external space of the weight body and an internal space surrounded by the inner peripheral surface while the suspended rope is suspended. The external space and the internal space communicate with each other in the radial direction of the weight body so as to allow entry and exit through the rope passage allowable space,
The detachable member has a shape that can be attached to the weight body so as to block the rope passage allowable space, and includes a pair of opposed side surfaces that can respectively face the pair of end surfaces. Have
The pair of opposed side surfaces have a detachable side concavo-convex portion that concavo-convex in the normal direction, and the pair of end surfaces slide relative to the weight main body along the specific fitting direction of the pair of detachable members. It has a body side uneven portion that fits in the fitting direction with the detachable side uneven portion so as to allow movement,
The detachable member has a supported surface that is opened downward, and the weight main body is opened upward so that the detachable side uneven portion and the main body side uneven portion are engaged with the supported surface in the vertical direction. Having a supporting surface to abut,
The weight main body and the detachable member receive the fastener at a position away from the supported surface and the support surface in a state where the detachable side uneven portion and the main body side uneven portion are completely fitted. An overwinding detection weight having fastening parts that are fastened to each other by the fastener.   The overwinding detection weight according to claim 1, wherein the supported surface is included in the detachable side uneven portion, and the support surface is included in the main body side uneven portion. .   3. The overwinding detection weight according to claim 1, wherein the fitting direction is a vertical direction, and the attachment / detachment-side uneven portion and the body-side uneven portion are arranged so that the attachment / detachment member is attached to the weight main body. For overwinding detection, having a shape that fits with each other as it descends from its upper position, and the supported surface and the supporting surface are in a position where they face each other in a vertical direction with the fitting completed Weight.   The overwinding detection weight according to claim 3, wherein the detachable side uneven portion and the main body side uneven portion are fitted so as to restrict relative displacement in the horizontal direction within a region extending in the vertical direction. Overweight detection weight having a shape.   5. The overwinding detection weight according to claim 4, wherein the main body side uneven portion includes a convex portion that continuously or intermittently exists in a region extending in the vertical direction, and the detachable side uneven portion is opened downward. A recess extending in the vertical direction so as to accept insertion from below the convex portion and closed at the upper end, and the top surface closing the upper end of the concave portion of the detachable side uneven portion serves as the supported surface. A weight for overwinding detection comprising the upper end surface of the convex portion constituting the support surface.   The overwinding detection weight according to claim 5, wherein the fastened part is positioned below the convex part of the main body side uneven part.   5. The overwinding detection weight according to claim 4, wherein the detachable side uneven portion includes a convex portion that is continuously or intermittently present in a region extending in a vertical direction, and the main body side uneven portion is opened upward. And includes a recess extending in the vertical direction so as to accept insertion from above the convex portion and closed at the lower end, the lower end surface of the convex portion constituting the supported surface, The overwinding detection weight, wherein the bottom surface closing the lower end of the recess constitutes the support surface.   The overwinding detection weight according to claim 7, wherein the fastened portion is positioned above the convex portion of the detachable side uneven portion.   The overwinding detection weight according to claim 2, wherein the fitting direction is a direction parallel to a radial direction of the weight main body, and the detachable side uneven portion and the main body side uneven portion are the detachable member. The weight for overwinding detection which has a shape which mutually fits with the movement which goes inside from the position of the radial direction outer side with respect to the said weight main body.   The overwinding detection weight according to any one of claims 1 to 9, wherein the fastener includes a bolt, and the fastened portion of the attachment / detachment member moves the attachment / detachment member with respect to the radial direction of the weight body. A detachable side bolt insertion hole that allows the bolt to pass through in a specific horizontal direction that is perpendicular to the body, and the fastened portion of the weight body includes the detachable side uneven portion and the main body side uneven portion. A body side bolt insertion hole that is adjacent to the fastening portion of the attachment / detachment member in the specified horizontal direction and that fits with the attachment / detachment bolt insertion hole and allows the bolt to be inserted in a state where the fitting with the portion is completed A weight for overwinding detection.

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