JPH0262473B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a crane of both horizontal and undulating type, which can be selectively used with the boom in a horizontal state or in an undulating state.

Background of the invention: Various types of cranes have been developed and are in practical use for lifting and lowering materials and equipment at construction sites, etc., but generally there are two types: horizontal boom cranes and undulating boom cranes. To the crane,
There are different types, and each model is selected and used depending on the conditions of the work site.
Both types have their own characteristics.
For example, horizontal boom cranes have the advantage of being able to move loads horizontally, so they can be carried over a relatively wide range, and can be retracted at a constant lifting height. It has to be installed higher than the intended structure, which increases costs due to the height of the mast, and it also has the disadvantage that it cannot be used unless there is ample installation space (work space). On the other hand, jib hoisting type cranes can raise and lower the jib (boom) to perform lifting and lowering operations, so when installing the mast, the height of the mast can be lower than that of the horizontal boom type cranes and still be able to achieve the desired purpose. Since the turning radius is small, it can fully demonstrate its functionality even in sites with narrow installation space (work space), but on the other hand, the working range is naturally narrower, and the lifted load displaces vertically when lifting, making it difficult to handle. This requires care and the jib must be raised and lowered each time the mast is added, which increases the working time and makes climbing work inconvenient.

In this way, the horizontal boom type and the undulating boom type each have their advantages and disadvantages, so in reality, two types of cranes are available, and the most convenient model is selected and used depending on the situation at the construction site. Therefore, in some cases, the operational period of the crane is short, and the cost of maintaining the crane in a warehouse for storage when not in use increases, resulting in a large economic loss.

Purpose of the invention: The present invention has been made in view of the above-mentioned situation, and it is possible to arbitrarily select either a horizontal type or an undulating type depending on the conditions of the work site where one crane is used. The object is to provide a device that has a function that can be used by switching methods.

Structure of the invention: The crane of the present invention has a main frame whose front side is open at the upper center of the turning table on a turning table attached to a frame body equipped with a climbing mechanism, and a main frame with an open front side. A boom support is attached to the top of the main frame, and a boom support is attached to the main frame via a pivot shaft so that the boom can be kept horizontal and raised in a laid down state, and a boom support is attached to the bottom of the boom. A trolley is attached so that it can move freely between the pivot point and the tip end, and a hanging pulley with a hook that hangs down from the trolley is lifted and lowered by a winch on a turning platform, and the rear end of the boom A boom levitation cable is wrapped around the main frame, and a boom buffer means is provided behind the main frame when the boom is raised.

Further, in the present invention, a locking device for fixing the trolley is attached to the tip of the boom, so that the trolley is fixed when the boom is used by raising and lowering it.

In the present invention, the mast segment is suspended inside the main frame from the open front surface of the main frame by traversing the trolley at an elevation angle of about 20 degrees from horizontal to the boom, and mast addition work during climbing is performed. It is made possible.

Furthermore, in the present invention, a safety cable whose starting end is fixed to the upper end of the main frame is strung between the rear end of the boom pivot and a suitable position on the turning table via a pulley attached to the boom, so that it can be used horizontally and This ensures safety whether used on ups and downs. If necessary, the main body may be fixed with a lock pin on the main frame when the boom is used horizontally.

Embodiments Next, the crane of the present invention will be described in detail with reference to embodiment drawings.

Fig. 1 shows the crane of the present invention when the boom is kept in a horizontal state, and an outer mast 2 equipped with a climbing mechanism 3 is fitted onto the upper part of a mast 1 having a well-known structure, and the upper end of the outer mast 2 is shown in Fig. 1. A turning table 4 is provided via a turning wheel attached to the turning table, and a mast hanging hole is provided on the upper surface of the turning table 4 at a required radius from the turning center. A main frame 5 with a height that allows one segment to be suspended is erected, and the front side of this main frame 5 is kept open or constructed so that the horizontal members can be removed only during climbing work to ensure sufficient strength. It is said to have the following.
A bracket 6 is provided on the top of the main frame 5 so as to protrude toward the rear end (it is preferable to provide two brackets in parallel at appropriate intervals), and a boom 10 of a required length is provided. is the core part 11
A mounting piece 12 protruding downward on the lower surface is engaged with the bracket 6 and connected to the pin 7, and the ratio is approximately 5.5:1 (not limited to this) with reference to the position of the pivot pin 7. It is installed so that it can be raised and lowered horizontally or up and down as appropriate.

The boom 10 is provided with guide rails 13 on both sides of the main member disposed on the lower side in a horizontal state, extending from the pivot portion to the front end, and a trolley 14 is provided along the guide rails 13 so as to be able to move freely. , this trolley 14 is operated by a traversing rope 1 operated by a traversing endless machine 15 installed on a turning table 4.
The suspension rope 18 that raises and lowers the hanging pulley block 17 with a hook that hangs down via pulleys 14' and 14' provided on the trolley 14 is connected to a hoisting machine 19 installed on the turning table 4. Accordingly, a known method is employed in which the rope follows a pulley provided at the top of the main frame 5, follows almost the same course as the traversing cable 16, and wraps around the pulley block 17, and the end of the rope is attached to the top of the main frame 5. It is connected to an overload detector 20. In this way, with respect to the front part equipped with the trolley 14, its traversing means, and the guide means for the hanging rope 18, the rear end of the boom 10 from the pivot position has a pulley block 22 mounted on a bracket 21 provided at its upper end. is attached, and the hoisting cable 24, which has one end connected to the turning table 4, is wound around a pulley 23 attached to the turning table 4 in the middle, so that it can be operated by a hoisting machine 25 installed on the turning table 4. The horizontal or undulating position of the boom 10 is determined by the undulating cable 24. In addition, a safety cable 26 whose one end is tied to a connecting part provided on the turning table 4
is arranged around a pulley 27 attached to the rear lower end of the boom 10 so that the other end is attached to the main frame 5, so that even if the hoisting cable 24 should break, the boom will be kept in a horizontal position and safe. It is set as.

Further, on the rear side of the main frame 5, as shown in FIG. 2, a buffer means 30 is provided to set the limit when the boom 10 is raised to the maximum angle of elevation, and to absorb the reaction force when the boom 10 is raised. For example, a combination of a hydraulic damper or coil spring, a supporting mechanism, and a stop plate may be attached directly to the side of the main frame 5, or a separate frame 1 (not shown) may be attached to the rear of the main frame 5. The buffer means is installed on this frame by standing it upright. Note that the abutment plate of this buffer means is arranged so as to abut on the main member of the boom 10 or a receiving face plate provided at a corresponding position.

Further, a fixing device for the trolley 14 is attached to the tip of the boom 10 at a predetermined position for use when the boom 10 is raised and lowered. A limit switch is attached to the most advanced position along the line, and the trolley 14 can be fixed only when this switch is activated, such as a toggle clamp type, toggle pin lock type, etc.
There are link types and other types that operate electrically or hydraulically. On the trolley 14 side, a device having a locking hole, a clamp shaft body, etc. corresponding to the type of the above-mentioned fixing device is used.

In the crane of the present invention constructed as described above, it is possible to select whether to use the boom 10 in a horizontal state or in an undulating state depending on the situation of the work site where the boom 10 is installed. As shown in Figure 1, the hoisting cable 24 is extended by operating the hoisting machine 25 and supported under tension with respect to the pivot pin 7. In this state, the safety cable 26 is extended to its maximum length so that the boom 10 does not tilt from the horizontal. Make it. Therefore, in the boom 10, the total weight of its own weight and the load suspended via the trolley 14 acts on the pivot part, and the reaction force against the moment acting on the front part from the pivot pin 7 position acts on the levitation cable 24, which The crane is balanced by the levitation rope 24 to operate as a crane in a horizontal state.
In this state, the trolley 14 can move freely along the guide rail 13 of the boom 10 by the operation of the endless machine 15, and can be operated in the same way as a conventional horizontal boom type crane.

Next, when using the boom 10 by raising and lowering it,
Move the trolley 14 to the extreme end of the boom 10 in a horizontal or slightly elevated state, actuate the limit switch (not shown), move the trolley fixing device, and attach the trolley 14 to the boom 10.
(1) When the crane is to be erected without operating the climbing mechanism, the trolley fixing device may be operated first to fix the trolley to the end of the boom). In this state, the traversing machine 15 is restricted from operating by the control circuit, and the hoisting machine 25 is operated to extend and retract the hoisting cable 24, so that the boom 10 is pivoted relative to the main frame 5 by the pivot pin 7. The working radius can be changed arbitrarily by raising and lowering the crane using the supporting position as a fulcrum, and by operating the suspension rope 18 using the hoisting machine 19, it can be used in the same way as a conventional undulating crane. In this state, with the load suspended, boom 1
Even if the boom 10 is erected, the shock absorbing means 30 is attached to the rear side of the main frame 5, so the boom 10
Even if the boom 10 is pivotally supported by the main body 11, the boom 10 is limited by the raising limit by the shock absorbing means 30 and absorbs the reaction force on the rear side due to excessive lifting. This can prevent accidents such as flipping over or buckling due to vibration.

As the work progresses, the lifting height increases, and if it becomes necessary to perform climbing work, the boom 10 moves the trolley 14 sideways along the guide rail 13 within a range of about 20° from horizontal to elevation. , move the mast segment 1' lifted from the required position to the front side of the main frame 5 as shown by the chain line A in Figure 1. The trolley 14 is moved to the inside of the mast 5 as shown by the chain line A, the mast segment 1' is suspended and connected to the center of the existing mast 1, and the climbing mechanism 3 is operated in a well-known manner to perform the lifting operation. ,
Repeat this in sequence until the required height is reached. When disassembling, do this in reverse order.

In addition, the vicinity of the connecting pivot between the boom and the main frame, for example, the pivot pin 7 in the above embodiment.
On the main frame 5 at an appropriate distance forward from the connection position, lock the protrusion protruding from the lower surface of the boom 10 and the bracket or similar device protruding from the upper surface of the main frame to ensure that the boom 10 is horizontal. If a safety means is provided to keep the boom stable by fixing it only when used in a certain condition, the levitation cable 24 can be used without applying excessive tension. As for the fixing means for this boom, in addition to manual operation, an automatically operated locking device may be attached to the top surface of the main frame and may be incorporated into the system so that it can be activated only when necessary by remote control.

In addition to the above-described structure, the structure of the connecting pivot between the boom and the main frame includes coaxial pins protruding from both sides of the boom main body, and a bracket supporting the pins on the main frame side. It may also be constructed so that it can be raised and lowered as it is attached. Furthermore, regarding the tilting of the boom during climbing, it is preferable to determine the usage limit while the trolley is in a state where it can move sideways.

Effects of the invention: As mentioned above, the crane of the present invention expands and contracts the levitation cable according to the work situation, so that the boom can be kept horizontal and the work radius is large, and cargo can be lifted and lowered over the entire area. It can be used as a floating type for use in relatively narrow sites where the boom is raised and lowered for lifting and lowering work, and one crane can be used as two types of cranes, so it can be left idle. The structure can be effectively used without any problems, the structure is simple, the handling is not complicated in any way, and the economic effect can be increased.

[Brief explanation of drawings]

The drawings show one embodiment of the crane of the present invention, in which Fig. 1 shows a case in which the boom is kept in a horizontal state, and Fig. 2 shows a case in which the boom is kept in an undulating state. . 1... Mast, 2... Outer mast, 3... Climbing mechanism, 4... Turning table, 5... Main frame, 6... Bracket, 7... Pivot pin, 10...
...Boom, 1... Main part of boom, 12... Mounting piece, 14... Trolley, 15... Traversing endless machine, 16... Traversing cable, 17... Hanging pulley block, 18... Suspension rope, 19... ...Hoisting machine, 21...
Bracket at the rear end of the boom, 22... Pulley block, 24... Hoisting cable, 25... Hoisting machine, 26...
Safety cable, 27...pulley, 30...buffer means.

Claims (1)

[Claims] 1. A main frame with an open front side is installed at the upper center of the turning table on a turning table attached to a frame body equipped with a climbing mechanism at the top of the mast, and a trolley is attached to the top of the main frame. A boom equipped with a rail is pivotally supported at its core,
The boom is supported so as to be able to rise and fall freely via a pulley block installed at the rear end with a hoisting cable operated by a hoist on a rotating board, and is kept horizontal when it is in the down position. The trolley, which has a suspended pulley with a hook that can be operated horizontally by a winch on a turning board, is fixed by a locking device attached to the tip of the boom only when the boom is raised or lowered, and the trolley is installed behind the main frame. This is a crane that can be used both horizontally and vertically, and is equipped with a shock absorber when the boom is raised.