JP3370790B2 - Mobile Crane Wire Detachment Prevention Device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook for hanging a hook via a wire rope from a pulley which is alternately extended to a tip of a crane beam and provided at the tip. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile crane wire detachment device having a long extension jib and a short extension jib configured to be lowered. 2. Description of the Related Art A mobile crane of this type will be described with reference to FIG. In FIG. 5, the mobile crane A is the vehicle 1
A swivel 2 which is mounted on the swivel so as to be freely rotatable;
And a crane boom 3 pivotally mounted on the upper part so as to be able to be driven up and down so as to carry out a crane operation by suspending a suspended load on a hook 4 suspended from the tip of the crane boom 3. Has become. Further, the crane beam 3 of the mobile crane A is used.
A hook 6 is connected to the tip via a wire rope 5 from the tip.
And a short extending jib 8 (FIG. 5) configured to suspend the hook 6 from the distal end via the wire rope 5.
(Shown by a chain line) can be alternately added, and the jig work using the long extending jib 7 or the short extending jib 8 can be performed by hanging the luggage on the hook 6. I have. [0003] The long extension jib 7 is widely used at the time of a high lift operation for carrying materials to a high floor at a construction site of a building or the like, and is configured as follows. In FIG. 6, reference numeral 9 denotes an engaging portion provided at the base end of the long extension jib 7. The engaging portion 9 is detached from a mounting shaft 10 which is provided upright at the distal end of the crane beam 3. It is rotatably mounted. Reference numeral 11 denotes a pulley provided at the tip of the long extension jib 7, and a wire rope 5 hanging a hook 6 is inserted into a pulley groove 11a of the pulley 11. Numeral 12 denotes a wire stopper member for preventing the wire rope 5 from deviating from the pulley groove 11a of the pulley 11, and the pulley groove 11 of the pulley 11
(a) The wire stopper member 12 is inserted into a boss hole 13 provided at a position close to the outer periphery to prevent the wire rope 5 from deviating from the pulley groove 11a. Note that the wire detachment preventing member 12 and the boss hole 13 constitute a wire detachment preventing device in the long extension jib 7. [0004] On the other hand, the short extension jib 8 is mainly used for the operation of driving a lightweight suspended load at a high speed to raise and lower the load, and is configured as follows. In FIG. 7, reference numeral 14 denotes a bracket provided at the base end of the short extension jib 8, and the bracket 14 is mounted on a mounting member 15 provided at the distal end of the crane beam 3 so as to be folded and stored. . Reference numeral 16 denotes a pulley provided at the tip of the short extension jib 8, and a wire rope 5 having a hook 6 suspended therethrough is inserted into the pulley groove 16a of the pulley 16 similarly to the long extension jib 7. ing. Numeral 17 denotes a wire retaining member for preventing the wire rope 5 from deviating from the pulley groove 16a of the pulley 16, and a boss hole 18 provided at a position close to the outer periphery of the pulley groove 16a of the pulley 16, Wire detachment prevention member
17 to prevent the wire rope 5 from deviating from the pulley groove 16a. In addition, the wire extension preventing member 17 and the boss hole 18 form a short extension jib 8.
Of the wire disconnection prevention device. Reference numeral 19 denotes an overwinding detector which detects that the hook 5 suspended from the tip of the extension jib has been wound up by a predetermined amount or more and outputs an alarm signal. The overwind detector 19 includes a long extension jib 7 and a short extension jib 8.
Are not used at the same time so that the jib work is not performed, so that they are alternately attached to the two joining jibs 7 and 8 and are commonly used. The overwind detector 19 includes a detector body 20 having a built-in detection switch (not shown) and a hook 6 suspended from the detector body 20 via a wire 21, that is, the hook 6 is in an overwound state. A weight 22 for detecting the state of being wound up by a predetermined amount or more and abutting on the hook 6, and an attachment member for alternately attaching the detector body 20 to a tip of a long extension jib 7 and a tip of a short extension jib 8. It consists of 23. The mobile crane A thus constructed is
When a high-lift work is desired, a long extension jib 7 is added to the tip of the crane beam 3 to perform the work, and a lightweight suspended load is to be driven at a high speed to drive the hoisting and lowering. In this case, it is sufficient to carry out the work by adding a short extension jib 8 to the tip of the crane beam 3, and it is possible to perform an efficient crane operation according to the work content. [0007] However, the crane
In order to add a long extension jib 7 or a short extension jib 8 to the tip of the arm 3 and perform the jib work by the extension jib, the extension jib 7 or 8 to the tip of the crane 3 is required. Along with the mounting operation, an operation of attaching the wire detachment preventing member and an operation of attaching the overwinding detector 19 are required, and there is a problem that the operation is complicated. If the operator forgets to attach the overwind detector 19, the overwind detector 19 is not attached to the extension jib 7 or 8 during the operation, and the hook 6 is overwound. However, since the alarm signal is not output, the operator may continue the hoisting drive, and the wire rope 5 may be cut off, causing an accident that the suspended load may fall. For example, as shown in FIG. 8, the long extension jib 7 is constituted by a lower extension type extension jib, and the extension jib 7 is raised from the suspended state to the extended state using the wire rope 5. When the short extension jib 8 is used as a guide for the wire rope 5 when performing the operation, the extension jib 8 is in an extended state unless the wire detaching stopper member 17 is removed from the pulley 16 of the short extension jib 8. As a result, the wire rope 5 is bent as shown by the solid line, and the wire rope 5 is damaged. The present invention facilitates the work of attaching the wire detachment preventing member and the overwind detector when the long extension jib 7 or the short extension jib 8 is attached to the tip of the crane beam 3. Another object of the present invention is to provide a movable crane wire detaching prevention device which can prevent forgetting to attach an overwinding detector and to remove a wire detachment preventing member as much as possible. [0011] In order to achieve the above-mentioned object, the present invention provides a movable crane wire retaining device having the following construction. That is, a wire rope is extended from a pulley which is alternately added to the tip of the crane beam and provided at the tip.
Mobile crane provided with a long extension jib and a short extension jib configured to suspend a hook through a hook
A boss hole provided at a position close to the outer circumference of the pulley groove of the pulley of each extension jib, and a wire slip-off preventing member inserted through the boss hole and preventing deviation of the wire rope from the pulley groove. And a single overwind detector which is attached alternately to the tip of each refill jib and detects that the hook has been wound up by a predetermined amount or more. The wire detaching prevention member is constituted by a single pin which can be inserted alternately into a boss hole provided in each of the extension jibs,
A device for preventing a wire from coming off of a movable crane, wherein the overwind detector is integrally attached to one side of the pin. In the mobile crane of the present invention having the above-described structure, the wire detaching preventing member is provided with a wire detaching preventing member which is alternately provided in a boss hole provided in a long extension jib and a short extension jib. It is composed of a single pin that can be inserted, and the overwind detector is integrally attached to the pin, so the wire can be disconnected simply by inserting the pin (prevention member for wire coming off) into the boss hole of the extension jib that performs the work. The operation of attaching the stop member and the operation of attaching the overwinding detector are completed at the same time. For this reason,
The burden on the operator can be reduced as compared with the prior art in which the work of attaching the wire detachment preventing member and the work of attaching the overwind detector are separately performed. Further, since the overwind detector is integrally mounted on the pin (the wire detachment preventing member), the operation of mounting the overwind detector can be performed simply by inserting the pin into the boss hole of the extension jib for performing the operation. Since it is completed, it is possible to prevent forgetting to attach the overwind detector as much as possible, and even if the hook is overwound, the operator continues to carry out the winding drive without noticing and the wire rope is turned off. Accidents such as cuts can be prevented beforehand. [0014] Further, since a single pin is used as a single wire for the wire retaining member in both the extension jibs, the pin must be removed from the other extension jib in order to attach the pin to the working extension jib. For example, even when a long extension jib needs to be used at the same time by attaching a long extension jib and a short extension jib at the same time and using the short extension jib as a guide for a wire rope, the operator is not required to operate. If the pin is attached to the long extension jib without forgetting, the pin is inevitably removed from the short extension jib, and as a result, it is possible to prevent forgetting to remove the wire retaining member. FIG. 1 is a perspective view of a movable crane according to an embodiment of the present invention; FIG.
The device for preventing the wire from coming off of the movable crane according to the present invention has a configuration of the wire coming-off prevention members 12 and 17 and a mounting of the overwinding detector 19 as compared with the wire coming off prevention device described in the prior art. Since only the configuration is different, only the difference will be described below. In FIG. 1, reference numeral 24 denotes a pin which constitutes a wire retaining member. The pin 24 is constituted by a single common pin so that it can be inserted into both the boss hole 13 provided in the long extension jib 7 and the boss hole 18 provided in the short extension jib 8. ing. Therefore, the pin 24
Into the boss hole 13 of the jib 7
24 crosses the outside of the pulley groove 11a of the pulley 11,
The wire rope 5 is prevented from deviating from 11a. Also, the pin 24 is added to the short jib 8
Of the pulley 16 in the pulley groove 16a.
Cross the outside position, and move wire rope 5 from the pulley groove 16a.
Is prevented from deviating. The detector body 20 of the overwind detector 19 is integrally attached to one end 24a of the pin 24,
By inserting the pin 24 into the boss hole 13 of the long extension jib 7, the overwind detector 19 can be attached to the tip of the long extension jib 7, and the pin 24 can be connected to the short extension jib 8. By inserting the overwind detector 19 into the boss hole 18, the overwind detector 19 can be attached to the tip of the short extension jib 8. In addition, when mounting the overwind detector 19,
The work of inserting the wire rope 5 through the weight 22 is necessary, but this operation is performed separately. Reference numeral 25 denotes the other end 24b of the pin 24,
It is a retaining piece provided to protrude from the outer periphery of the pin 24 in the radial direction. In order to attach the pin 24 to the long extension jib 7, the stopper piece 25 is inserted into the groove 26 provided in the boss hole 13 of the extension jib 7, and then the pin 24 is rotated ( In the case of the present embodiment, the pin 24 can be prevented from coming out of the boss hole 13 by rotating about 180 °). Also, when attaching the pin 24 to the short extension jib 8, after inserting the pin 24 into the groove 27 provided in the boss hole 18 of the extension jib 8,
By rotating the pin 24, the pin 24 can be prevented from coming off. Next, the operation will be described. First, in order to carry out the jib work by extending the long extension jib 7 to the tip of the crane beam 3, the long extension jib 7 is craneed.
A method of attaching to the tip of the program 3 to attach the wire detachment preventing member and the overwind detector will be described. In addition, as for the method of attaching the long extension jib 7 to the tip of the crane beam 3, a conventionally well-known method may be used, and detailed description thereof will be omitted. In order to attach the wire detachment preventing member and the overwind detector to the long extension jib 7 attached to the tip of the crane beam 3, a pulley provided at the tip of the long extension jib 7 is used. After passing the wire rope 5 through the pulley groove 11a of the eleventh, the pin 24 integrally mounted with the detector main body 20 of the overwind detector 19 may be inserted into the boss hole 13. As a result, since the pin 24 is brought to a position crossing the position outside the pulley groove 11a, it is possible to prevent the wire rope 5 from deviating from the pulley groove 11a during the jib operation. Also, since the detector body 20 of the overwind detector 19 is integrally attached to one end 24a of the pin 24, the mounting of the detector body 20 is completed only by inserting the pin 24 into the boss hole 13, If the wire rope 5 is later inserted through the weight 22, the work of attaching the overwind detector 19 to the long extension jib 7 is completed. Next, in order to extend the short extension jib 8 to the tip of the crane beam 3 to perform the jib operation, the short extension jib 8 is extended to the tip of the crane beam 3 to prevent the wire from coming off. A method for mounting the member and the overwind detector will be described. In addition, as for the method of attaching the short extension jib 8 to the tip of the crane beam 3, a conventionally well-known method may be used, and a detailed description thereof will be omitted. In order to attach a wire detachment preventing member and an overwind detector to the short extension jib 8 attached to the tip of the crane beam 3, the wire extension stopper and the overwind detection are attached to the long extension jib 7. In the same manner as in the case of mounting the container, the pulley groove 16 of the pulley 16 provided at the tip of the short extension jib 8
After passing the wire rope 5 through a, the pin 24 may be inserted into the boss hole 18. As a result, since the pin 24 is brought to a position crossing the position outside the pulley groove 16a, it is possible to prevent the wire rope 5 from deviating from the pulley groove 16a during the jib operation. In addition, one end 24a of the pin 24 has a detector main body.
Since the detector body 20 is mounted, the mounting of the detector main body 20 is completed only by inserting the pin 24 into the boss hole 18, and if the wire rope 5 is inserted through the weight 22, the overhang to the short extension jib 8 is completed. The mounting work of the winding detector 19 is completed. When the long extension jib 7 is mounted, the short extension jib 8 is used as a guide for the wire rope 5 when the extension jib 7 is pulled up from the suspended state to the extended state using the wire rope 5. In this case, since there is only one pin 24 as a wire retaining member, the operator inserts the pin 24 into the boss hole 13 of the long extension jib 7 (the jib work is performed with the long extension jib 7). If the operator is wearing the long extension jib 7 for the purpose, and the operator does not forget to attach the pin 24 to the long extension jib 7), the pin is inevitably connected to the short extension jib 8. twenty four
Since the wire rope 5 has been removed and the wire rope 5 has been forgotten to remove the wire retaining member of the short extension jib 8 as in the conventional wire retaining device, the wire rope 5 will not be bent and damaged. In the above-described embodiment, an example in which the extension jib of the lower extension type is used as the long extension jib 7 has been described.
However, the present invention is not limited to this, and it is a matter of course that the present invention may be applied to a laterally extending type extending jib or a sliding type extending jib. In the embodiment described above, an example was described in which the other end 24b of the pin 24 was directly supported by the boss hole 13 or 18. However, the wire detachment prevention device of the present invention is not limited to this. However, as shown in FIG. 4, a removable receiving member 28 is inserted into the boss hole 13b or 18b on the other end side, and the other end 24b of the pin 24 is inserted into the inner hole 29 of the receiving member 28. Needless to say, the pin 24 may be configured to be attached. In this case, the weight 22 for detecting the over-wound state is connected to one end 24a of the pin 24.
Can be supported by the two wires 21 fixed to the detector body 20 and the receiving member 28, which has an effect of stably supporting the weight 22. According to the present invention, the device for preventing the wire from coming off of the movable crane, which is constructed and operated as described above, has a long extension jib or a short extension jib attached to the tip of the crane boom. In doing so, the work of attaching the wire removal prevention member and the overwind detector is facilitated, and the forgetting of the overwind detector and the removal of the wire removal prevention member can be prevented beforehand. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view illustrating a device for preventing a wire from coming off of a movable crane according to the present invention. FIG. 2 is an explanatory view illustrating a wire detachment prevention device according to the present invention, and is an explanatory view illustrating a state where a wire detachment prevention member is inserted into a long extension jib. FIG. 3 is an explanatory view illustrating a wire detachment prevention device according to the present invention, and is an explanatory view illustrating a state in which a wire detachment prevention member is inserted into a short-length extension jib. FIG. 4 is an explanatory view for explaining another embodiment of the wire separation preventing device of the present invention. FIG. 5 is an explanatory diagram illustrating a schematic configuration of a mobile crane. FIG. 6 is an explanatory view of a wire detachment prevention device in a conventional long extension jib. FIG. 7 is an explanatory view of a conventional wire detaching prevention device in a short-length extension jib. FIG. 8 is an explanatory view for explaining a problem in mounting a long extension jib in a conventional movable crane. [Description of Signs] 3 Crane beam 5 Wire rope 6 Hook 7 Long extension jib 8 Short extension jib 11, 16 Pulley 13, 18 Boss hole 19 Overwind detector 24 Wire detachment prevention member (pin)

Claims (1)

(57) [Claims 1] An elongated structure in which a hook is suspended via a wire rope from a pulley provided alternately at the tip of the crane beam and provided at the tip. Cranes provided with a suitable extension jib and a short extension jib, in particular, a boss hole provided at a position close to the outer periphery of the pulley groove of the pulley of each extension jib, A wire slip-off prevention device comprising a wire slip-off prevention member for preventing deviation of the wire rope, and a unit for detecting that the hook is wound up by a predetermined amount or more by being alternately attached to the tip of each of the extension jibs. In a movable crane provided with a single overwinding detector, the wire detachment preventing member is constituted by a single pin which can be inserted alternately into a boss hole provided in each of the extension jibs, of A device for preventing a wire from coming off of a movable crane, wherein the overwind detector is integrally attached to one side.