JP5890741B2 - Double swivel hanger - Google Patents

Description

  The present invention relates to a suspension device such as a crane that requires a highly reliable holding unit for a suspended load, such as a suspension device used for transferring a radioactive substance in a nuclear power plant.

  In a nuclear facility such as a nuclear power plant, a crane that transports a cask, which is a container for transporting and storing radioactive materials, maintains a basic safety function that reliably prevents falling loads, such as wire ropes and hooks. Duplication of main parts is required.

  Duplexing here means that when a mechanism that plays a certain role cannot maintain its function due to damage or the like, the function is maintained and safety is secured by another alternative mechanism that plays the same role. Even in the conventional suspension apparatus, there are already existing ones in which a suspended portion using a wire rope or the like and a suspended load holding portion are doubled.

  FIG. 5 shows the configuration of a conventional suspension device. In FIG. 5, 1 and 2 are wire ropes suspended from a trolley provided on the crane. Duplexing of the suspension part at the upper part of the suspension device is realized by alternately multiplying the two wire ropes 1 and 2 on the sheave 3. Further, in the suspended load holding portion at the lower portion of the suspension device, a hook 17 is rotatably attached to the lower portion of the frame 4, and a sling 18 is provided on the side surface of the frame 4. As a result, a suspended load (not shown) is held double by suspension means such as a rope and a link. By holding the suspended load with the hook 17 and the sling 18, the suspended load can be held even if one of them is broken.

  However, at this time, even if an attempt is made to rotate the suspended load for the transport operation, conventionally, the suspended load cannot be turned because the turning mechanism other than the hook is not provided. Up to now, there has been no lifting device that can be swiveled in a duplex state, and therefore, a conventional facility required a separate swiveling facility for suspended loads.

  Japanese Patent Application Laid-Open No. H10-228667 has a double suspension mechanism having a first holding part and a second holding part for holding two container trunnion shafts orthogonal to each other in order to prevent the cask from dropping in a suspension device such as a cask. It is disclosed.

  Further, in Patent Document 2, in the transfer cask facility, as shown in FIG. 5 in particular, from the main hoisting jig 25 and the hoisting wire 27a for suspending the reflector replacement plug, the auxiliary hoisting jig 26 and the hoisting wire 27b. A doubled suspension mechanism is disclosed.

  Furthermore, Patent Document 3 discloses a configuration in which the central hook 11 and the suspension beam having a pair of hooks at both ends can be rotated simultaneously in the swing suspension beam to improve workability.

JP 2009-8545 A JP 2004-45146 A JP-A-60-77086

  However, Patent Document 1 does not disclose a configuration in which the turning mechanism is doubled for safety. Similarly, Patent Document 2 does not disclose a configuration that doubles a turning mechanism to achieve safety. Further, Patent Document 3 discloses a configuration in which the frame 2 and the beam 13 are fixed and rotated simultaneously by levers 18a and 18b, but a configuration in which the frame 2 and the beam 13 are rotated while maintaining a turning function is not disclosed.

  In the above nuclear facilities and the like, there are cases where it is difficult to install swivel equipment because the site area is limited. In that case, if the suspension device can be swiveled while keeping the hanging part, suspended load holding part, and turning part redundant, the basic safety function can be maintained without the need for special turning equipment other than the lifting device. As a result, workability can be greatly improved.

  In view of the above-described problems, an object of the present invention is to provide a suspension device having a doubled suspension that can be turned.

  In order to realize a double swivel lifting tool that achieves the above-described object, it is necessary to enable swivel while maintaining a double holding part for a suspended load. For this purpose, the frame of the lifting tool is divided into upper and lower parts, a suspension part such as a wire rope is provided at the upper part, and a holding part for the suspended load is provided at the lower part, and a turning mechanism may be provided therebetween. This turning mechanism must also carry the suspension of the lower frame.

  To make the swivel unit redundant, a double swivel suspension can be realized by connecting the upper and lower frames via a swivel shaft and simultaneously connecting the upper and lower frames via other swivel bearings capable of withstanding a suspended load.

  The suspension from the crane body can be doubled by using multiple wire ropes, and the hanging part, the swivel part, and the holding part for the suspended load are doubled, so that the entire suspension is doubled. A hanging tool can be realized.

  Further, the dual turning mechanism can be realized by making the turning shaft a double structure of the outer hollow shaft and the inner solid shaft.

  In addition, a double swivel implement is realized by using a drop-off preventing metal fitting instead of the swivel bearing.

  The present invention includes an upper frame suspended from a support structure by at least double suspension means, a lower frame, a pivot shaft that pivotably connects the upper frame and the lower frame, and a pivot that can pivot and swing on the lower frame. In the suspension device provided with a hook and a slinging portion that holds a suspended load, a locking portion that rotatably connects the upper frame and the lower frame is provided.

  Further, in the double swivel hanger of the lifting device, the locking portion is characterized in that the upper frame and the lower frame are always kept in contact with each other.

  In addition, in the double swivel hanger of the suspension device, the locking portion is formed of a swivel bearing that is provided between the upper frame and the lower frame and loads a radial load and an axial load.

  Further, in the double swing swing device of the suspension device, the locking portion is provided between the upper frame and the lower frame and includes a hollow swing shaft provided on the outer periphery of the swing shaft.

  Further, in the double swivel hanger of the suspension device, the locking portion is characterized in that the upper frame and the lower frame are always kept in a non-contact state.

  In addition, in the double swivel hanger of the suspension device, the locking portion is composed of a drop-off preventing metal fitting provided between the upper frame and the lower frame.

  In addition, in the double turning swivel of the suspension device, the drop-off prevention metal fitting is engaged with a circumferential groove provided on one of the upper frame and the lower frame and a circumferential groove provided on the other of the upper frame and the lower frame. It consists of joint parts.

  In addition, the dual swivel suspension of the suspension device is characterized in that a swivel drive mechanism that swivels the swivel shaft is provided in the upper frame, and the swivel shaft and the lower frame are swiveled automatically.

  The present invention includes an upper frame suspended from a support structure by at least double suspension means, a lower frame, a pivot shaft that pivotably connects the upper frame and the lower frame, and a pivot that can pivot and swing on the lower frame. In the suspension device having a hook and a slinging portion that is provided to hold a suspended load, the suspended load can be swiveled while maintaining a duplex as a suspension by providing a locking portion that connects the upper frame and the lower frame. It is possible to reduce the number of swiveling equipment and to eliminate the work of changing the suspended load that has been performed when the swiveling equipment is used, thereby improving workability.

It is the front view which fractured | ruptured a part which shows the hanging tool of Example 1 of this invention. It is the front view which fractured | ruptured a part which shows the hanging tool of Example 2 of this invention. It is the front view which fractured | ruptured a part which shows the hanging tool of Example 3 of this invention. It is the side view which fractured | ruptured a part which shows the hanging tool of Example 4 of this invention. It is a front view which shows the structure of the hanging tool of a prior art example.

  The present invention will be described below with reference to examples.

  FIG. 1 shows a first embodiment of the present invention. Example 1 shows a structure of a lifting tool provided with a swivel drive mechanism after a suspension part, a turning part and a holding part for a suspended load are both duplicated.

  In FIG. 1, a turning shaft 7a fixed integrally with a nut 6 is rotatably supported by a thrust bearing 8a on an upper housing 5 fixed in an upper frame 4a of a lifting tool. The lower end of the pivot shaft 7 a is fixed to a lower housing 10 provided in the lower frame 9.

  The lower frame 9 is further connected to the upper frame 4a by a swivel bearing 11a so as to be rotatable and suspendable. The slewing bearing is configured to be able to support a radial load and an axial load. In the first embodiment, when an axial load by the lower frame 9 is applied, this can be supported. Therefore, even when either the turning shaft 7a or the turning bearing 11a is damaged and loses its function, the remaining turning shaft 7a or the turning bearing 11a can turn and suspend the lower frame 9, thereby realizing a double turning mechanism. doing.

  For example, a hook 17 is attached to the lower frame 9 so as to be pivotable and swingable, but a sling 18 is provided separately. As a result, even if either the hook 17 or the sling 18 is broken, it is possible to hold the suspended load on the remaining side, thereby realizing a double suspended load holding portion.

  FIG. 2 shows a second embodiment of the present invention. In FIG. 2, instead of the slewing bearing 11a, a hollow slewing shaft 7b supported by the upper housing 5 by a thrust bearing 8b so as to be able to slew is used similarly to the slewing shaft 7a. The lower end of the hollow turning shaft 7b is fixed to the lower housing 10.

  According to the configuration of the second embodiment, the hollow turning shaft 7b is concentrically provided on the outer periphery of the turning shaft 7a, so that the turning mechanism can be configured more compactly.

  FIG. 3 shows a third embodiment of the present invention. Duplexing can also be realized by using a drop-off prevention metal fitting 11b instead of the slewing bearing 11a.

  The drop-off preventing metal fitting 11b is engaged with the upper frame when the pair of engaging parts fixed to the upper frame 4a and the lower frame 9 are always in a non-contact or sliding state, and the turning shaft 7a is broken. 4a and the lower frame 9 are locked together. The drop-off prevention metal fitting 11b can be constituted by a metal fitting or the like that is engaged with the circumferential groove on one side and the circumferential groove on the other side and can be turned.

  In order to prevent the suspension of suspended loads and suspenders without considering the duplication of the swivel mechanism, it is sufficient to provide several separate drop-off prevention brackets. However, in this case, there is no dual function of the turning mechanism.

  FIG. 4 shows a fourth embodiment of the present invention. In FIG. 4, the lower frame 9 is swiveled by power by further driving the swivel shaft 7 a by the motor 16 via the nut 6, sprockets 12 and 13, the chain 14, and the speed reducer 15. Although FIG. 4 uses chain transmission, the rotation shaft 7a can be controlled to rotate by other transmission mechanisms such as a belt transmission and a gear mechanism regardless of the chain transmission. According to the said structure, it becomes possible to operate easily suspended loads, such as a cask which consists of a heavy article.

  A hook 17 is attached to the lower frame 9 so as to be pivotable and swingable, and further has a sling 18. Even if either the hook 17 or the sling 18 is broken, the remaining hook 17 or sling 18 It has a duplex structure that can hold suspended loads.

DESCRIPTION OF SYMBOLS 1, 2 ... Wire rope 3 ... Sheave 4 ... Frame 4a ... Upper frame 5 ... Upper housing 6 ... Nut 7a ... Turning shaft 7b ... Hollow turning shaft 8a ... Thrust bearing 8b ... Thrust bearing 9 ... Lower frame 10 ... Lower housing 11a ... Slewing bearing 11b ... Fall-off prevention metal fittings 12, 13 ... Sprocket 14 ... Chain 15 ... Reducer 16 ... Motor 17 ... Hook 18 ... Catch section

Claims (8)

  An upper frame suspended from the support structure by at least a double suspension means, a lower frame, a pivot shaft that pivotably couples the upper frame and the lower frame, and a pivot that swings and swings on the lower frame. A suspension device having a hook for holding a suspended load and a slinging portion, wherein a locking portion for rotatably connecting the upper frame and the lower frame is provided.   2. The double swivel hanger for a suspension apparatus according to claim 1, wherein the locking portion keeps the upper frame and the lower frame in contact with each other at all times.   The duplex swing swinging device for a suspension device according to claim 1 or 2, wherein the locking portion is provided between the upper frame and the lower frame and includes a swing bearing that loads a radial load and an axial load. A double swivel hanging device for the suspension device.   3. The double swing suspension device for a suspension apparatus according to claim 1, wherein the locking portion is provided between the upper frame and the lower frame, and includes a hollow swing shaft provided on an outer periphery of the swing shaft. A double swivel hanger for a suspension device.   2. The double swivel hanger for a suspension apparatus according to claim 1, wherein the locking portion always keeps the upper frame and the lower frame in a non-contact state. 3. 6. The double swivel hanger for a suspension device according to claim 1, 2 or 5 , wherein the locking portion comprises a drop-off prevention fitting provided between the upper frame and the lower frame. A double swivel hanging device for the suspension device.   7. The double swivel hanger for a suspension device according to claim 6, wherein the drop-off prevention metal fitting is provided on a circumferential groove provided on one of the upper frame and the lower frame, and on the other of the upper frame and the lower frame. A double swivel hanger for a suspension device, comprising an engaging portion that is provided and engages with a circumferential groove. Automatic In dual pivoting hanger hanging device according to any one of claims 1 to 7, the swing drive mechanism for rotating the swivel axis on said frame is provided, wherein the pivot axis and the lower frame A double swivel hanging device for a suspension device, characterized in that the swivel device is swiveled.

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