JPH0340866Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a crane device with a luffing jib.

(Prior Art) In recent years, as buildings have become taller, there has been a demand for higher cranes, especially mobile cranes, used for unloading construction materials at construction sites, with higher lifting heights and wider working capacity. Against this background, for example, as shown in FIG. 6, the telescopic boom 61 is pivotably mounted, and the tip 63 of the post 63 attached to the boom tip 61a is attached.
A and the tip 62a of the luffing jib 62 are connected by a tension rod 64 of a predetermined length,
A wire rope 67 of a winch device 65 provided on a swivel table 66 is connected to the tip 63a of the post 63, and the luffing jib 62 is raised and lowered by winding and unwinding operations of the winch device 65. A crane device with a luffing jib has been developed which ensures both a working lifting height and a working clearance.

However, in the case where the luffing angle of the luffing jib 62 is controlled by the winch device 65 on the swivel base 66, the luffing angle of the luffing jib 62 is controlled in conjunction with the lifting and extending movements of the telescopic boom 61.
Since the luffing angle of the luffing jib 62 relative to the luffing jib 62 changes, when the telescopic boom 61 is operated, the winch device 65 is also operated at the same time.
However, the luffing jib 62 has disadvantages in terms of operability, such as the need to correct the undulation angle of the luffing jib 62 with respect to the luffing jib 62 in order to secure a working space below the luffing jib 62.

The disadvantage of a crane device in which the luffing angle of the luffing jib 62 is controlled by the winch device 65 on the swivel base 66 is that the telescopic boom 61
As a solution to the problem that the undulation angle of the luffing jib 62 changes with respect to the
A device such as that disclosed in Publication No. 91287 has been developed. This crane device, as shown in FIG.
It is composed of a first jib 56 fixed to the first jib 56 and a second jib 57 pivotably supported on the tip of the first jib 56, and the second jib 57 is provided on the first jib 56 side. The first jib 5 is moved by a back tension rope 59 that expands and contracts in response to the displacement of the hydraulic cylinder 58.
6, so that the relative relationship between the first jib 56 and the second jib 57 can be maintained constant regardless of whether the boom 54 is raised or lowered or extended or contracted. be.

However, in this case, boom 5
Although the relative relationship between the first jib 56 and the second jib 57 is prevented from changing due to the up-and-down movement of the first jib 5,
Since the luffing jib 6 does not move up and down relative to the boom 54, there is a problem in that the working allowance is small compared to the overall length of the luffing jib 55.

Furthermore, when the jib work is not performed, it is necessary to store the luffing jib 55 on the boom 54 side. In this case, in this known example, the first rib 56 and the second jib 57 are first folded in half. After being folded into a shape, it is stored horizontally on the side of the boom 54, which poses a problem that the work is complicated and the workability is poor.

In addition to the above-mentioned known example, based on the same idea, there is a jib that is formed in two parts on the proximal end side and the distal end side, for example, as disclosed in Japanese Utility Model Application No. 57-49889. There is one in which the jib is directly raised and lowered by a hydraulic cylinder placed on the side of the jib.

(Purpose of the invention) The present invention attempts to solve or improve the problems pointed out in the above-mentioned prior art section. A luffing jib is detachably attached to the tip of the boom, and the luffing jib is raised and lowered as appropriate during jib work. In this crane device with a luffing jib, (1) it aims to improve the crane operability during jib work, (2) it improves work efficiency by expanding the work area during jib work, and it is compact when the jib is stored. (3) To improve workability when attaching and detaching the luffing jib.

(Means for achieving the object) As a means for achieving the above object, the present invention has a luffing jib removably attached to the tip of a boom that is attached to the base so that it can be raised and lowered in the vertical direction. In the crane device with a luffing jib, the luffing jib comprises a telescoping jib having a proximal jib fixed to the boom side and a distal jib telescopically inserted into the proximal jib. In addition, the base end jib has a two-part structure consisting of a base piece fixed to the boom side and a tip piece connected to the tip of the base piece, and the base piece and the tip piece are connected to each other. They are connected and supported so as to be pivotable in the vertical direction by an appropriate luffing jib drive mechanism disposed between them, and in the first state of the proximal end side jib, the proximal end piece and the distal end piece are mutually connected. The distal end jib is coaxially extended and allowed to be stored therein, and in the second state, the distal end piece is vertically pivotally connected to the proximal end piece. and the luffing jib mechanism is provided on the luffing jib side so that it can be operated independently of the raising and lowering movement of the boom. It is characterized by

(Function) In the present invention, the luffing jib drive mechanism is provided on the luffing jib side by means of the above means, so that even when the boom moves up and down and extends and contracts, the luffing angle of the luffing jib, that is, the base There is no change in the bending angle between the proximal end piece and the tip piece of the end side jib, and therefore there is no need to perform the raising/lowering/extending operation of the luffing jib simultaneously with the raising/lowering/extending operation of the boom. In addition, there is no need to disassemble and reassemble the luffing jib drive mechanism when attaching or detaching the luffing jib to the tip of the boom, making the work easier. In addition, since the distal end piece is designed to move up and down relative to the proximal end piece, for example, as shown in FIG. Compared to the case of a configuration in which the crane is raised and lowered, the working capacity of the crane device can be increased by the length of the tip piece (i.e., it is possible to increase the working capacity of the crane equipment by the length of the tip piece (i.e., for operations that require the maximum lifting height, and for operations that require a maximum lifting height, but not as much as the maximum lifting height, but larger than that for boom operations). The jib configuration can be easily selected and used for operations that require a large lifting height and a large working pocket.) When the luffing jib is stowed, the proximal piece and tip piece of the proximal jib are coaxial with each other. Since the distal side jib is extended and arranged and the distal side jib is stored inside this proximal side jib,
Even though the proximal jib has a two-part structure that can be raised and lowered, the length of the luffing jib in the stored state can be made shorter because the luffing jib is configured with a telescoping jib. When attaching and detaching the luffing jib to the boom, it is sufficient to keep the boom nearly horizontal near the ground and pull out or push the distal jib relative to the proximal jib.
Compared to the crane device shown in the figure, which requires the luffing jib to be bent in the vertical direction, the workability of attaching and detaching the luffing jib is improved.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5.

Fig. 1 shows a crane device Z with a luffing jib according to an embodiment of the present invention, and in the figure, reference numeral 1 denotes a crane device Z equipped with a swivel base 2 (corresponding to the base in the scope of the utility model registration claims). This is vehicle 1. This swivel base 2 includes a telescoping boom 3 equipped with a luffing jib 4 (described in detail later), which is the main body of the present invention.
is attached so that it can be raised and lowered in the vertical direction, and the luffing jib 4 is stored horizontally on the side of the boom 3 as shown in Fig. 1 during non-jib work when the luffing jib 4 is not used. During work, it is attached to the tip 3a of the boom 3 as shown in FIGS. 2 and 3.

Hereinafter, the specific structure of this luffing jib 4 will be explained in detail with reference to FIG. 2 and subsequent figures.

The luffing jib 4 is a two-stage telescoping jib as shown in Figs.
, an intermediate jib 6 telescopically inserted into the base end jib 5 , and a distal end jib 7 telescopically inserted into the intermediate jib 6 . Among these jibs, the base end jib 5 corresponds to the base end jib within the scope of the utility model registration claim, and the intermediate jib 6 and the tip jib 7
falls under the tip side jib within the scope of the utility model registration claim.

The proximal jib 5 further includes a proximal piece 51 located at its proximal end and a distal piece 52 located at its distal end.
It has a two-part structure. This proximal piece 5
1 and the distal end piece 52 are mutually bent by a pivot pin 24 provided across the distal end 51b of the proximal end piece 51 and the proximal end 52a of the distal end piece 52, as shown in FIG. (This state is a state in which the proximal end jib 5 can perform its original function as a luffing jib, and in the following description, this state will be referred to as a luffing state). On the other hand,
The distal end portion 51b of the proximal end piece 51 and the proximal end portion 52a of the distal end piece 52 are provided with the pivot pin 2, respectively.
Pin receiving holes 2 are spaced appropriately from 4 so that they can overlap with each other.
7, 28 are formed, and the proximal end piece 51 and the distal end piece 52 have the pair of pin receiving holes 27, 28 overlapped with each other with the pivot pin 24 attached thereto, and the fixing pin 25 is inserted therein. By fitting and inserting, the luffing jib 4 is connected and fixed in a straight line as shown in FIG. 3 (this state is a state in which the luffing jib 4 can function as a fixed jib, and in the following description, this state will be referred to as a fixed state).

This base end jib 5 has jib side brackets 21 and 2 provided at the base end portion 51a of this base end piece 51.
1... to the boom-side brackets 22, 22... provided on the tip 3a of the boom 3, the tip of the boom 3 can be placed in a roughing state or a fixed state as shown in FIGS. 2 and 3. Part 3a
Extended and fixed in front of. When the proximal jib 5 is positioned in a fixed state, the intermediate jib 6 and the distal jib 7 can be contracted and stored within the proximal jib 5, as shown by solid lines in FIG. . Further, the intermediate jib 6 and the tip jib 7 are positioned in a fully extended state as shown in FIGS. 2 and 3 (shown by chain lines) during jib work. The extension and contraction movements of the intermediate jib 6 and the tip jib 7 are performed by external force such as human power or rope tension of a winch device. Further, the positions of the intermediate jib 6 and the distal jib 7 at the fully retracted position and the fully extended position are fixed using fixing pins provided between the intermediate jib 6 and the proximal jib 5 or between the intermediate jib 6 and the distal jib 7, respectively. (not shown).

The luffing jib 4, which is composed of the two-divided proximal jib 5, the intermediate jib 6 and the distal jib 7 that extend and contract with respect to the proximal jib 5, is used as the second jib during jib work.
As shown in the figure, there is a first mode in which the base end jib 5 is positioned in a luffing state and the base end jib 5 is used with the original function of a luffing jib (that is, it can be raised and lowered), and the chain line diagram in FIG. With the base end jib 5 positioned at the fixed position, the luffing jib 4 is fully retracted or fully extended, and jib work is performed in this state (in other words, it is used as a fixed jib, which is different from the original usage of the luffing jib). Usage) The working mode is selected as the second mode.

Further, a post 8 is pivotally connected to the distal end portion 51b of the proximal piece 51 of the proximal jib 5. When the luffing jib 4 is used in the first mode, the post 8 is extended outward as shown in FIG. One end 9a of the tension rope 9 is hooked to the tip 7a) of the tension rope 9, and the other end 9b of a tension rope 9 of a predetermined length is hooked thereto.
On the other hand, when the luffing jib 4 is used in the second mode, it is stored and fixed along the base end piece 51 side as shown in FIG.

Furthermore, a post-side sheave 23 is attached to the tip 8a of the post 8, and the post 8 is held in its posture by the rope tension of a back tension rope 10 that is passed around the post-side sheave 23. , the back tension rope 1
It can be rotated back and forth by adjusting the length of the rope. In order to adjust the rope length of this back tension rope 10,
In this embodiment, the proximal piece 5 of the proximal jib 5
An adjustment device 11, which will be described later, is provided on the inner surface 51c of 1.

The adjusting device 11 has a first sheave 1 at the tip of its piston rod 31, as shown in FIGS. 2 and 4.
4 has a hydraulic cylinder 12 attached thereto. This hydraulic cylinder 12 has its cylinder tube 3
A trunnion mechanism 33 is provided at one end 32a on the side of the piston rod 31 of the hydraulic cylinder 12 by an appropriate dimension in the axial direction (arrow A-B direction), and the other end 32b is provided with a trunnion mechanism 33 that allows the boom 3 to move by an appropriate dimension.
A receiving groove 19 is formed that can abut and engage with the cylinder receiving member 18 provided on the distal end portion 3a side in the direction of extension thereof. Therefore, the hydraulic cylinder 12
is the cylinder tube 3 in its fully contracted state.
2 itself is drawn toward the arrow A side and its receiving groove 19
moves from the position shown by the solid line in FIG. 5 to the position shown by the chain line (numeral 19') in the same figure,
The engagement between the receiving groove 19 and the cylinder receiving member 18 is released. On the other hand, the hydraulic cylinder 12
When the first sheave 14 is expanded and a load is applied to the first sheave 14, the cylinder tube 32 moves in the direction of arrow B to the position shown by solid lines in FIGS. Part 1
8 in the extending direction of the hydraulic cylinder 12, and the load (rope tension of the back tension rope 10, which will be described later) applied to the first sheave 14 is directly transmitted through the cylinder receiving member 18. It will be supported on the boom 3 side.

Further, the first sheave 14 is supported by guide rollers 17 and 1 provided on a bracket 35 that supports the first sheave 14.
7 is rotatably fitted into a pair of left and right guide rails 13, 13 attached to the proximal end piece 51 side, respectively, and the first sheave 14 is rotated as the hydraulic cylinder 12 expands and contracts. In Figure 4, the position shown by the solid line and the position shown by the chain line (symbol 14')
It is possible to move between.

Furthermore, the back tension rope 10 has the following features:
As shown in FIGS. 2 and 5, one end 10a of the cable is hooked to the first cable end stopper 36 provided on the inner surface 51c of the proximal end piece 51, and then this is hung around the first sheave 14, Furthermore, the second sheave 15 provided on the inner surface 51c side and the third sheave 16 provided on the outer surface 51d side are sequentially wound around the outer surface 51d.
After pulling it out to the side, attach it to the post 8 above.
The other end 10b is attached to the outer surface 51d.
The second cable end stopper is provided at the end of the cable. Therefore, the hydraulic cylinder 12 expands and contracts to open the first sheave 1.
4 moves in the direction of arrow A-B, the post side sheave 23 of the post 8, the third sheave 16 on the base end piece 51 side, and the second cable end stop 37 of the back tension rope 10 move accordingly. The length of the rope stretched between the ends of the rope increases or decreases, and the post 8 rotates in the direction of arrow C-D. (Hereinafter, this will be referred to as the luffing part 4a, and the part of the proximal end piece 51 will be referred to as the base part 4b of the luffing jib 4). You will be forced to move up and down in different directions.

In this embodiment, the post 8, the tension rope 9, and the back tension rope 10 are
and the adjusting device 11 constitute a luffing jib drive mechanism X within the scope of the utility model registration claims. Furthermore, in order to dispose the luffing jib drive mechanism
It is necessary to secure a certain amount of space on the side.

In the crane device Z equipped with the luffing jib 4 configured as described above, during jib work in which the luffing jib 4 is used in the first mode as shown in FIG. The entire roughing portion 4a on the distal side of the distal end piece 52 is the proximal end piece 5.
1 and is raised and lowered relative to the base portion 4b. Therefore, for example, as in the conventional crane device disclosed in Japanese Utility Model Application Publication No. 59-91287,
Compared to the case where the entire base part 4b is used, only the tip piece 52 has a larger working capacity as a crane device Z, and a large working capacity is required, especially when lifting a load on the top side of a high-rise structure. Suitable for work.

In addition, in this case, the back tension rope 10
Since the adjustment device 11 for adjusting the rope length of the back tension rope 10 is provided not on the boom 3 side but on the luffing jib 4 side, the undulation angle of the luffing portion 4a of the luffing jib 4 (i.e., the base end piece 51 and the bending angle of the tip piece 52)
is unrelated to the raising/lowering and extension/contraction operations of the boom 3.
For this reason, the luffing angle of the luffing jib 4 is not changed in conjunction with the raising/lowering and extending/contracting operations of the boom 3, and therefore, the luffing jib 4 can be moved simultaneously with the raising/lowering operations of the boom 61 as in the conventional example shown in FIG. The operability is improved compared to the case where the luffing angle of the luffing jib 62 has to be corrected by performing the luffing operation of the luffing jib 62.

Furthermore, in this case, the proximal piece 5 of the proximal jib 5
Since one end of the hydraulic cylinder 12 provided on the inner surface 51c of the boom 3, that is, the surface on the collapse side of the proximal end piece 51, is supported on the distal end 3a side of the boom 3, the extension force of the hydraulic cylinder 12 is applied to the proximal end. It acts in the direction of suppressing the piece 51 from falling down. Therefore, the lodging direction supported between the jib side brackets 21, 21, . The rotational moment decreases, and the boom 3 and luffing jib 4
This improves the load conditions at the joints with the steel, which is advantageous in terms of strength.

On the other hand, especially when working with a jib that requires a high lift, as shown by the chain line in Figure 3,
While the base end jib 5 is set in the fixed state, the intermediate jib 6 is
and the tip jib 7 are respectively extended to secure the lifting height.

Also, when storing the luffing jib 4 from its first or second position,
For example, in the first mode, the boom 3 is fully retracted from the state shown in FIG. 2, and then, while lowering the boom 3, the luffing jib 4 is raised to a straight state (the state shown by the chain line in FIG. 3). let me,
The luffing jib 4 is supported substantially parallel to the ground. In this state, the proximal end piece 51 and the distal end piece 52 are positioned and fixed in a fixed state, and a wire rope of a winch device (not shown) installed at the proximal end of the boom 3 is connected to the distal end side of the distal jib 7. By connecting and winding the winch device, the intermediate jib 6 and the distal jib 7 are inserted into the proximal jib 5 using the rope tension of the wire rope.

As described above, in the crane device of this embodiment, when the luffing jib 4 is in the retracted state, the tip piece 52 and the base piece 51 of the base end jib 5 are coaxially extended and fixed, and the base end jib 5 is Since the intermediate jib 6 and the tip jib 7 are stored in an inserted state inside the luffing jib 4,
This makes it possible to make the storage form of the jib more compact, and together with the bending structure of the base end jib 5 mentioned above, this improves work efficiency by expanding the work area during crane work, and the luffing jib 4 during non-jib work. This allows for compact storage.

When the reduction operation of the luffing jib 4 is completed, next, the luffing jib 4 is
Of the connecting pins on both the left and right sides (not shown) provided between the jib side bracket 21... of the boom 3 and the boom side bracket 22... of the tip 3a of the boom 3,
The connecting pin on one side is removed, the boom is rotated rearward about the connecting pin on the other side, and the boom is stored sideways on the side of the boom 3 (see Fig. 1).

Further, the luffing jib 4 is extended from the retracted state by the reverse procedure of the retracting operation described above. However, the luffing jib 4 is pulled out manually, but in this case, by tilting the boom 3 downward slightly toward the tip side, the luffing jib 4 can be pulled out easily with a small operating force.

As described above, according to this crane device Z, the luffing jib 4 can be extended and retracted by rotating the luffing jib 4 in the horizontal plane and pushing and pulling it in the axial direction. As with the crane device disclosed in Japanese Patent Publication No. 59-91287, it is necessary to perform rotation operations in the vertical plane and rotation operations in the horizontal plane, and especially rotation operations in the vertical plane require this. The operation is simpler and easier than when the boom has to be carried out with the boom raised, and the operability when extending and retracting the luffing jib 4 is improved accordingly.

(Effects of the invention) The present invention provides a crane device with a luffing jib that is removably attached to the tip of a boom that is attached to a base so that it can be raised and lowered in the vertical direction.
This comprises a telescoping jib having a proximal jib fixed to the boom side and a distal jib telescopically inserted into the proximal jib, and
The base end jib has a two-part structure consisting of a base piece fixed to the boom side and a tip piece connected to the tip of the base piece, and the base piece and the tip piece are connected between the two. The proximal end piece and the distal end piece are connected and supported so as to be pivotable in the vertical direction by an appropriate luffing jib drive mechanism disposed in the jib. The distal end jib is allowed to be stored inside the distal jib, and in the second state, the distal end piece is connected to the proximal piece so as to be pivotable in the vertical direction. The luffing jib mechanism is configured to be raised and lowered integrally with the tip side jib by the luffing jib drive mechanism, and the luffing jib mechanism is provided on the luffing jib side so that it can be operated independently of the raising and lowering movement of the boom. It is a feature.

Therefore, according to the crane device with a luffing jib of the present invention, (1) Since the luffing jib drive mechanism is provided on the luffing jib side, even when the boom moves up and down, the luffing angle of the luffing jib is adjusted in conjunction with this up and down movement. In other words, there is no change in the bending angle between the proximal piece and the tip piece of the proximal jib, and there is no need to simultaneously raise and lower the luffing jib at the same time as the boom is raised and lowered, making jib work easier. (2) The proximal end side jib of the luffing jib is Since the structure is divided into two parts, the proximal end piece and the distal end piece, and the distal end piece is designed to move up and down relative to the proximal end piece, for example, as shown in FIG. Compared to a configuration in which the distal end jib is raised and lowered relative to the proximal jib, the working space of the crane device can be increased by the length of the distal end piece, and the work performance is improved accordingly. (3) Ruffing jib In the retracted state, the distal end piece and the proximal end piece of the proximal end jib are coaxially extended and fixed, and the distal end jib is stored in an inserted state inside the proximal end jib. (4) Since the luffing jib is composed of a telescoping jib, when the luffing jib is attached to and detached from the boom, the boom can be held almost horizontally near the ground. The distal side jib can be pulled out or pushed in with respect to the proximal side jib while the
Compared to the crane device shown in the figure, which requires the luffing jib to be bent in the vertical direction, the workability of attaching and detaching the luffing jib is improved.

[Brief explanation of drawings]

FIG. 1 is a side view of a crane device according to an embodiment of the present invention, FIG. 2 is a diagram showing the extended state of the luffing jib provided in the crane device shown in FIG.
The figure is a state change diagram of the luffing jib shown in Fig. 2, Fig. 4 is a - arrow view of Fig. 2, Fig. 5 is a - arrow view of the main part of Fig. 4, and Figs. 6 and 7 are FIG. 2 is a side view of main parts of a crane device with a luffing jib of a conventional structure. 1...Vehicle, 2...Swivel base (base), 3...Boom, 4...Luffing jib, 5...Proximal side jib, 6, 7...Tip side jib, 8...Post, 9...
... Tension rope, 10 ... Back tension rope, 11 ... Adjustment device, 12 ... Hydraulic cylinder, 13 ... Guide rail, 51 ... Base end piece, 52 ... Tip piece, X ... Luffing jib drive mechanism .

Claims (1)

[Scope of utility model registration request] A crane device with a luffing jib is provided with a luffing jib 4 removably attached to a tip end 3a of a boom 3 that is attached to a base 2 so as to be movable up and down in the vertical direction.
This consists of a telescoping jib having a proximal jib 5 fixed to the boom 3 side and distal jibs 6 and 7 telescopically inserted into the proximal jib 5, and The proximal end jib 5 is connected to a proximal piece 51 fixed to the boom 3 side and a distal end piece 5 connected to the distal end portion 51a of the proximal piece 51.
The proximal end piece 51 and the distal end piece 52 are connected and supported so as to be pivotable in the vertical direction by an appropriate luffing jib drive mechanism X disposed between the proximal end piece 51 and the distal end piece 52. In the first state of the jib 5, the proximal end piece 51 and the distal end piece 52 are arranged to extend coaxially with each other, and the distal end side jibs 6 and 7 are allowed to be stored therein. In the second state, the distal end piece 52 is connected to the proximal end piece 51 so as to be pivotable in the vertical direction, and the distal side jibs 6, 7
The luffing jib mechanism X is provided on the luffing jib 4 side so that it can be operated independently of the raising and lowering movement of the boom 3. A crane device with a distinctive luffing jib.