JP6680591B2 - Retractable crane - Google Patents

Description

  The present invention relates to a retractable crane.

  Generally, in ports and the like, cargo handling machines such as cranes are provided on the quay in order to unload loads such as ores and coal.

  FIG. 3 shows a double-link type retracting crane, which is a type of such a cargo handling machine. In the retractable crane 50, a center post 1a is erected on the upper surface side of the traveling base 1, and a plurality of sets of tire traveling devices 2 are arranged on the lower surface side.

  A base 4 is rotatably provided on the center post 1a via a turning mechanism 3, a machine room 5 is provided on the rear side of the base 4, and an A frame 6 is erected on the front side. ing.

  A front end of the front link 7 is pivotally attached to a front end of the base 4 via a shaft 7a so that a portion near the base end of the front link 7 can be pivoted above the A frame 6. The tip of the supported balancing lever 8 is connected via a tension bar 9. The front end of the screw rod 11 of the gear jack 10 having the base end portion pivotally supported in the middle stage of the A frame 6 is further connected to a portion near the base end of the front link 7, and the screw rod 11 of the gear jack 10 is pulled out. The front link 7 is undulated by the retracting operation.

  The base end of the upper link 12 is pivotally attached to the upper portion of the A frame 6 via a shaft 12a, and the front end portion of the front link 7 and the front end portion of the upper link 12 are connected to the middle portion and the base end of the main link 13. A double link is formed by being connected to the section via a shaft 7b and a shaft 12b, respectively, and the tip of the main link 13 is configured to be capable of projecting or retracting in the horizontal direction (hereinafter, this main link 13 is horizontal. The direction in which the direction is extended or retracted is referred to as the "retraction direction").

  A suspension frame 14 is pivotally attached to the tip of the main link 13, and a wire rope 16 is fed from the suspension frame 14 from a hoisting device 15 provided in the machine room 5. A hanger 18 such as a grab bucket that holds and transports the load 17 is suspended.

  In such a double-link type retractable crane 50, when the screw rod 11 of the gear jack 10 is extended, the front link 7 falls down, and the tip end of the main link 13 moves toward the sea side as shown by the solid line in FIG. Move to. On the other hand, when the screw rod 11 of the gear jack 10 is pulled in, the front link 7 stands up and the tip of the main link 13 moves to the land side as shown by the chain double-dashed line in FIG.

  At the time of loading and unloading work, the lifting device (grab bucket) 18 in a state in which the front link 7 is laid down and opened from the tip end of the main link 13 is suspended from the upper opening 19a of the bulk carrier 19 into the ship. After grasping the load 17 by closing, the grab bucket 18 is raised. Then, the front link 7 is erected to move the tip end of the main link 13 to the land side together with the grab bucket 18, and when the grab bucket 18 comes over the hopper 20 provided on the traveling platform 1, the front link 7 is opened. The load 17 is thrown into the hopper 20.

  Here, a driver's cab 21 is provided on the front side of the machine room 5, and operation operations such as inversion / standing of the front link 7, lifting / lowering of the grab bucket 18, opening / closing, etc. are performed from here.

  As shown in FIGS. 3 and 4, a pedestal 22 is provided on the side of the base 4 near the base end portion of the front link 7, and the cab 21 is supported here via a moving frame 23. There is. The moving frame 23 is installed so as to be slidable along the retracting direction with respect to the pedestal 22, and supports the driver's cab 21 forward while sliding on the base 4 between the sea side and the land side. It has become. That is, when the cargo handling is not performed, the operator's cab 21 can be stored near the machine room 5 on the land side as shown by the chain double-dashed line in FIG. 3 and can be projected to the sea side as shown by the solid line during the cargo handling work. It has become. Note that, in FIG. 4, for convenience of description, some of the devices (the hopper 20 and the like) are not shown.

  As a document showing the general technical level of this type of retractable crane, for example, there is Patent Document 1 below.

JP 2001-354389 A

  As described above, when carrying out the cargo handling work by the retractable crane 50, the operator's cab 21 is extended to the sea side. This is because the operation is performed while visually observing the inside of the glove bucket 18 and the bulk carrier 19 from this position. On the other hand, after the glove bucket 18 picks up the load 17 in the bulk carrier 19, the glove bucket 18 is opened. When the load 17 is moved to the hopper 20 and the load 17 is dropped, it is difficult to confirm whether or not the load 17 can be reliably put into the hopper 20 without spilling because the driver's cab 21 is located far from the hopper 20. Further, at this time, since the grab bucket 18 is moving to the rear of the driver's cab 21, the driver has to face the back and perform the driving operation, which is troublesome. Although it is not impossible to move the cab 21 to the land side when the grab bucket 18 is retracted, the driving operation becomes complicated, which is also troublesome.

  In view of such a situation, the present invention intends to provide a retractable crane that can easily move the operator's cab back and forth in accordance with the movement of the hanger.

The present invention relates to a front link installed on a base so that it can be undulated, and the front link is connected via a shaft to the front end of the front link. A main link configured so that the tip is pulled in interlocking with, a suspender hung from the tip of the main link, and slidable in the pull-in direction of the main link on the base while supporting a driver's cab. A movable frame configured and an additional link connecting the main link and the movable frame, a base end of the additional link is connected to the movable frame via a shaft, and a tip end of the additional link is the main link. citations to be connected via a shaft, said moving frame in conjunction with the pull-in movement of the main link is characterized by being configured to slide It relates to the crane.

In the retractable crane of the present invention, a space may be provided in the center of the front end side of the front link, and the moving frame may be configured to slide through the space.

  According to the retractable crane of the present invention, the excellent effect that the operator's cab can be easily moved back and forth in accordance with the movement of the lifting device can be achieved.

It is a front view which shows the retractable crane by implementation of this invention. It is a side view which shows the retractable crane by implementation of this invention, and is a II-II arrow equivalent view of FIG. It is a front view which shows the conventional retractable crane. It is a side view which shows the conventional retractor crane, and is a IV-IV arrow equivalent view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIGS. 1 and 2 show an example of the form of a retractable crane according to an embodiment of the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIGS. Is the same as the conventional one shown in FIGS. Note that, in FIG. 2, for convenience of description, illustration of some devices is omitted.

  In the retractable crane 100 of the present embodiment, a center post 101a is erected on the upper surface side of a traveling pedestal 101, and a plurality of sets of tire traveling devices 2 are arranged on the lower surface side. A base 104 is rotatably provided via a mechanism 103, a machine room 105 is provided on the rear side of the base 104, and an A frame 106 is provided upright on the front side.

  A front end of a front link 107 is pivotally attached to a front end of the base 104 via a shaft 107a so that a portion near the base end of the front link 107 can be pivoted above the A frame 106. It is connected to the tip of the supported balancing lever 108 via a tension bar 109. The front end of the screw rod 111 of the gear jack 110 having the base end portion pivotally supported at the middle stage of the A frame 106 is further connected to a portion near the base end of the front link 107, and the screw rod 111 of the gear jack 110 is pulled out. The front link 107 is undulated by the retracting operation.

  A base end of an upper link 112 is pivotally attached to an upper portion of the A frame 106 via a shaft 112a, and a front end portion of the front link 107 and a front end portion of the upper link 112 are connected to an intermediate portion and a base end of the main link 113. To form a double link by connecting the shaft to each part via a shaft 107b and a shaft 112b, and the tip of the main link 113 is configured to be retractable in the horizontal direction (hereinafter, the above-mentioned conventional example (see FIG. 3)). Similarly to the above, the direction in which the main link 113 overhangs or retracts in the horizontal direction is referred to as the “retracting direction”).

  A suspension frame 114 is pivotally attached to the end of the main link 113, and a wire rope 116 fed from the suspension frame 114 from a hoisting device 115 provided in the machine room 105 is used to remove loose or powdered material. A hanger 18 such as a grab bucket that holds and transports the load 17 is suspended.

  Then, the front link 107 is laid down or erected by projecting or retracting the screw rod 111 of the gear jack 110, and the tip end portion of the main link 113 is, as shown in FIG. 1, a sea side (shown by a solid line) or a land side (two-dot chain line). It can be moved along the pulling direction.

  The above construction is almost the same as that of the conventional retracting crane 50 shown in FIGS. 3 and 4, but in the case of the retracting crane 100 of the present embodiment, as shown in FIG. A gap 107c is provided, the driver's cab 121 and the moving frame 123 are arranged in the gap 107c, and the driver's cab 121 and the moving frame 123 slide in the retracting direction through the gap 107c. In the case of the present embodiment, the front link 107 is configured by connecting two vertically extending vertical members 107d by a plurality of horizontal members 107e. Here, within a predetermined range on the base end side of the vertical members 107d. Since the horizontal member 107e is not provided, the gap 107c is provided between the two vertical members 107d.

  The moving frame 123 is mounted on the base 104 with respect to the base 104 without the intermediary of the pedestal 22 protruding to the side of the front link 107 such as the conventional retracting crane 50 (see FIG. 3). It is installed so that it can slide.

  The configuration of the front link 107 or the gap 107c is not limited to the above example. For example, by forming the front link 107 as one material of an inverted Y-shape or an inverted U-shape, a space is provided at the center of the base end side, and the driver's cab 121 and the moving frame 123 can be slidably arranged therein. good.

  In the retractable crane 100 of this embodiment, the vicinity of the central portion of the main link 113 and the vicinity of the central portion of the moving frame 123 are connected by the additional link 124. The base end of the additional link 124 is connected to the moving frame 123 via a shaft 124a, and the tip of the additional link 124 is connected to the main link 113 via a shaft 124b. In this way, the moving frame 123 slides between the sea side and the land side along the retracting direction in association with the movement of the main link 113.

  Next, the operation of this embodiment described above will be described.

  At the time of cargo handling work, first, when the front link 107 is laid down as shown by the solid line in FIG. 1, at the same time, the main link 113 is laid down in conjunction with this, and the tip end of the main link 113 is lifted by a hanger (grab bucket). ) 18 and overhang to the bulk carrier 19 on the sea. At this time, since the main link 113 is connected to the moving frame 123 by the additional link 124 as described above, the moving frame 123 slides to the sea side together with the operator's cab 121 in association with the extension of the main link 113. From this position, the driver in the cab 121 visually checks the tip of the main link 113, the grab bucket 18, and the bulk carrier 19 and suspends the grab bucket 18 from the upper opening 19a of the bulk carrier 19 into the ship. And grab bucket 18 are raised.

  Then, when the front link 107 is erected, at the same time, the main link 113 is erected in conjunction with this as shown by the chain double-dashed line in FIG. 1, and the tip end of the main link 113 is moved to the land hopper 20 together with the grab bucket 18. Be drawn towards. At this time, since the moving frame 123 slides to the land side together with the driver's cab 121 in conjunction with the pulling-in of the main link 113, the driver in the driver's cab 121 can move the driver inside the driver's cab 121 from the tip of the main link 113, the grab bucket 18, and the hopper. It is possible to perform an operation of visually checking 20 and moving the grab bucket 18 onto the hopper 20 to open it and loading the load 17 into the hopper 20.

  As described above, in the retractable crane 100 of the present embodiment, the main link 113 projects in accordance with the fall of the front link 107, and the cab 121 is advanced to the sea side in conjunction with this. Therefore, if the front link 107 is laid down and the main link 113 is extended, the cab 121 automatically slides to a position suitable for cargo handling work on the sea side. In this way, at the start of the cargo handling work, it is not necessary to separately perform the operation of moving the cab 121 forward separately from the operation of the front link 107 or the main link 113, which is simple.

  Further, in the present embodiment, the main link 113 is pulled in according to the standing of the front link 107, and in conjunction with this, the cab 121 is retracted to the land side. Therefore, when the load 17 picked up by the grab bucket 18 is put into the hopper 20, the operator's cab 121 also automatically moves backward in accordance with the backward movement of the glove bucket 18, so that the hopper 20 and the hopper 20 can be moved from a position close to the hopper 20. The grab bucket 18 can be visually inspected to perform a driving operation, which enables more reliable and efficient cargo handling work. Unlike the retractable crane 50 (see FIG. 3) according to the conventional example described above, it is not necessary to operate the operator's cab 21 projecting to the sea side facing backward.

  At this time, in the retractable crane 100 of the present embodiment, as described above, the moving frame 123 slides through the gap 107c provided in the center of the base end side of the front link 107, and the moving frame 123 is The link 107 and the main link 113 are adapted to slide within the plane in which they operate. Therefore, when connecting the main link 113 and the moving frame 123, the main link 113 and the moving frame 123 can be easily interlocked by a simple structure having one rod-shaped additional link 124 in the plane. it can.

  That is, in the conventional retracting crane 50 in which the cab 21 and the moving frame 23 are arranged as shown in FIGS. 3 and 4, the sliding surface of the moving frame 23 is coincident with the operating surface of the front link 7 and the main link 13. Absent. Therefore, if an additional link as in the present embodiment is installed on the retractable crane 50 of the conventional example and the main link 13 and the moving frame 23 are to be connected, the main link 13 and the moving frame 23 are moved relative to each other. Therefore, the additional link may be twisted. Also, if one wishes to avoid this twist, the construction of the additional link has to be complicated, for example with a plurality of parts having separate actuation surfaces. As described above, in the present embodiment, by disposing the driver's cab 121 and the moving frame 123 as described above, the structure of the additional link 124 that links the movements of the main link 113 and the moving frame 123 is simplified.

  Further, it is not necessary to provide the pedestal 22 that projects to the side of the front link 7 like the retractable crane 50 of the above-mentioned conventional example, and the cost for installing such a pedestal can be reduced.

  As described above, in the present embodiment, the front link 107 is installed on the base 104 so that it can be undulated, and the front link 107 is connected to the tip of the front link 107 via the shaft 107b, and is linked to the fall of the front link 107. The main link 113 is configured so that its front end projects and the front end of the front link 107 is pulled up in association with the standing up of the front link 107, a suspender (grab bucket) 18 suspended from the front end of the main link 113, and a driver's cab. The movable frame 123 configured to be slidable on the base 104 in the retracting direction of the main link 113 while supporting 121, and the additional link 124 connecting the main link 113 and the movable frame 123 are provided. Since the moving frame 123 is configured to slide in association with the movement in the direction, Cab 121 is advanced automatically with the overhang of the tank 113, the cab 121 with the retraction of the main link 113 is retracted automatically. Therefore, it is not necessary to independently operate the movement of the cab 121, and in the cargo handling work, the driving operation can be performed while visually observing the grab bucket 18 from a position close to the glove bucket 18.

  Further, in this embodiment, a gap 107c is provided at the center of the front end side of the front link 107 so that the moving frame 123 slides through the gap 107c, and the base end of the additional link 124 is attached to the moving frame 123 by a shaft 124a. Since the end of the additional link 124 is connected to the main link 113 via the shaft 124b, the movement of the moving frame 123 can be interlocked with the main link 113 with a simple configuration. Moreover, there is no need for a cradle that projects to the side of the front link 107.

  Therefore, according to the present embodiment described above, the operator's cab can be easily moved back and forth in accordance with the movement of the hanger.

  It should be noted that the retractable crane of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

18 Lifting equipment (grab bucket)
100 retractable crane 104 base 107 front link 107b shaft 107c void 113 main link 121 operator's cab 123 moving frame 124 additional link 124a shaft 124b shaft

Claims (2)

A front link installed on the base so that it can be undulated,
A main link configured to be connected to the tip of the front link via a shaft, the tip protruding in association with the fall of the front link, and the tip being drawn in association with the standing of the front link;
A suspender suspended from the tip of the main link,
A movable frame configured to be slidable in the retracting direction of the main link on the base while supporting a driver's cab,
Comprises an additional link connecting the main link and the moving frame,
The base end of the additional link is connected to the moving frame via a shaft, and the tip end of the additional link is connected to the main link via a shaft.
A retractable crane, characterized in that the moving frame is configured to slide in association with movement of the main link in the retracting direction. The retractable crane according to claim 1, wherein a gap is provided at a center of a base end side of the front link, and the moving frame is configured to slide through the gap.

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