JPS6323427Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a foldable boom for a mobile crane.

A base boom section whose proximal end is connected to a swivel base rotatably mounted on a vehicle such as a truck in a manner that allows adjustment of elevation, and from below the base boom section along the proximal boom section. A folding boom comprising a folding boom section having its proximal end connected to the distal end of said base boom section for pivoting between an inverted and folded folded position and a deployed position. It has become increasingly popular in recent years because it is possible to move a load over a wide range from a hook directly disposed at the tip or from a hook suspended from the tip of a folding boom section via a wire rope.

However, with this type of folding boom, since the cargo is handled at the tip of the folding boom section attached to the tip of the base boom section, it is natural that the cargo is not placed near the tip of the base boom section. It has the disadvantage that it cannot be moved.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention seeks to provide a new folding boom for mobile cranes that allows cargo handling near the tip of the base boom section.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the foldable boom of the mobile crane of the present invention will be described in detail below with reference to the drawings.

In the figure, A is a mobile crane, and this mobile crane A is equipped with a swivel base C rotatably mounted on a vehicle B and a foldable boom D. The foldable boom D consists of a base boom section 1 whose base end is connected to the swivel base C so as to be adjustable in elevation, and a folding position where the base boom section 1 is inverted and folded from below along the base boom section 1 (see Fig. 1). The proximal end of boom section 1 can be rotated between the position shown in Figure 2) and the deployed position (position shown in Figure 2).
The folding boom section 2 is pivotally connected to the tip of the boom section 2 via a support shaft E, and is rotatably driven by a hydraulic cylinder.

The basic boom section 1 includes a basic part 3 having a hollow rectangular cross-sectional shape, as shown in detail in FIG.
It consists of a support cylinder 4 which is telescopically fitted into the base part 3 and has a bracket 5 extending downward at its tip. A pair of brackets 6 extending upward are provided on both sides of the tip of the base portion 3 of the base boom section 1. A double-acting hydraulic cylinder 7 for extending and retracting the support cylinder 4 with respect to the base part 3 is interposed between the base part 3 and the support cylinder 4 in a state that it is housed inside the base part 3 . As shown in FIG. 3, this hydraulic cylinder 7 has a bracket 9 provided at the pip end of the cylinder 8, a boss hole 10 provided in both side plates near the base end of the basic part 3, and a bracket provided at the tip of the piston rod 11. 12 is connected to the base end of the support tube 4 with pins 13 and 14, respectively. The bracket 9 of the cylinder 8 pip end of the hydraulic cylinder 7 is provided with a support leg 16 having a support plate 15 at its lower end that is slightly shorter than the inner dimension of the left and right side plates of the basic part 3.
Further, at the end of the cylinder 8 on the piston rod side, a support leg 18 is similarly provided at the lower end thereof with a support plate 17 which is slightly shorter than the inner dimension of the left and right side plates of the basic part 3. When the hydraulic cylinder 7 is inserted from the distal end side of the basic part 3 when the hydraulic cylinder 7 is assembled into the basic part 3,
The basic part 3 corresponds to the pin hole of the bracket 9.
The bracket 9 is supported by the bottom plate of the base part 3 so that it is at the level of the boss hole 10 of the hydraulic cylinder 7. (concatenation) is facilitated. Further, the support leg 18 is
When the hydraulic cylinder 8 is in an extended state and a compressive load is applied to the hydraulic cylinder 8 and it is about to buckle, the end of the cylinder 8 on the piston rod side, which is approximately in the middle of the extended hydraulic cylinder 7, is pressed against the bottom plate of the basic part 3. This prevents buckling. Support cylinder 4 for base part 3
Support plates 19 and 20 for telescopically supporting the base portion 3 are provided at upper and lower positions inside the distal end of the base portion 3 and at upper and lower positions outside the proximal end of the support tube 4, respectively. The support plate 19 supports and guides the support tube 4 from above and below at the tip of the base portion 3, and the support plate guides the base end of the support tube 4 from above and below within the base portion 3. Base boom section 1
The base end portion of the basic portion 3, which is the base end portion of the base portion 3, is constructed as follows. That is, the base end of the base part 3 is provided with a boss hole 21 for pivotally connecting the base boom section 1 to the swivel base C, as will be described later. Atsuteko boss hole 2
1 are provided with a pair of brackets 22 extending downward from both sides of the base portion 3 and having a boss hole 23 at the lower end for connecting a hydraulic cylinder for raising and lowering the base boom section, which will be described later. There is.
A pulley 24 is provided between the pair of brackets 22 with its outer edge close to the lower surface of the base portion 3.
28 is a pulley provided at the lower center of the base portion 3 of the base boom section 1;
As shown in FIGS. 5 and 6, the base portion 3 is rotatably supported by a cantilever-shaped support shaft 30 extending horizontally from a bracket 29 projecting downward from the base portion 3. On the support shaft 30 on the opposite side of the bracket 29 across the pulley 28, a wire rope removal stopper indicated by the reference numeral 31 is rotatably provided. This wire rope detachment stopper 31 is provided with a claw 32 extending in the radial direction, and when the claw 32 is rotated upward (towards the base part 3), the upper end of the claw 32 is attached to a plate 32 provided below the base part 3. When the claw 32 is rotated sideways, the wire rope passing above the pulley 28 is prevented from deviating from the pulley 28. It can be removed and installed from the side. The wire rope removal stopper 31 is usually a claw 3
2 is rotated upward, and the wire rope removal stopper 31 and the support shaft 30 are connected with a pin so that they cannot rotate. Base boom section 1 is the first
As shown in the figures and FIG.
A hydraulic cylinder 53 for raising and lowering the base boom section 1 has its base end pivotally connected to the swivel base C.
By being pivotally connected to the tip of the swivel base C, it is connected to the swivel base C so that the elevation can be adjusted freely.

The folding boom section 2 consists of an outer boom section 26 and an inner boom section 27 telescopically inserted into the outer boom section 26. At the proximal end of the outer boom portion 26 of the folding boom section 2, a bracket 33 is provided for associated connection of the folding boom section 2 to the distal end of the base boom section 1. The tip of the inner boom portion 27 is provided with a gooseneck portion 34 extending downward (upward in the state shown in FIG. 1), and a tip pulley 35 is pivotally supported on this gooseneck portion. A bracket 33 provided at the base end of the outer boom section 26 is pivotally connected to the bracket 5 of the support tube 4, which is the distal end of the base boom section 1, via a support shaft E, and serves as a collapsible boom section. 2 is a folded position in which the base boom section 1 is inverted and folded around the spindle E (positions shown in Figures 1, 3, and 4) and an unfolded position (position shown in Figure 2). It is designed to be able to rotate between. The bracket 33 is provided with an arm portion 33' extending further toward the proximal end of the folding boom section 1 from the pivot connection by the support shaft E. is pivotally connected by a shaft 39 to the tip of a connecting rod which is pivotally connected 37 to the tip of the bracket 6 at the tip of the base section 3 of the base boom section 1. The folding boom section 2, whose proximal end is connected to the distal end of the base boom section 1 in this way, can be folded in reverse along the base boom section 1 by extending and contracting the hydraulic cylinder 7. It can be rotated between a folded position and an unfolded position. That is, when the hydraulic cylinder 7 is extended from the state shown in FIG. 1 and the support cylinder 4 is extended from the base portion 3, the position of the support shaft E moves in the extension direction. On the other hand, the bracket 6 is connected by the connecting rod 38.
and the tip of the arm portion 33' of the bracket 33 are connected, and the distance between the pivot connections 37 and 39 is kept constant, so as the hydraulic cylinder 7 extends, the folding boom section 2 moves as shown in FIG. Rotate counterclockwise at . The retracting movement of the hydraulic cylinder 7 drives the folding boom section 2 to pivot clockwise in FIG. The bracket 33 is connected to the folding boom section 2 in plan view.
(See Figure 4)
This allows the tip of the folding boom section 2 to be positioned to the side of the base end of the base boom section 1 when the folding boom section 2 is inverted and folded from below along the base boom section 1. I have to. As a result, when the foldable boom A is stored, the cargo space below the base end of the base boom section 1 is secured as wide as possible. Reference numeral 40 denotes a folding pulley provided on the support shaft E; 41 and 42 refer to a folding pulley 28 provided on the base section 3 of the base boom section 1; These are pulleys provided at the proximal and distal ends (upper in the state shown in FIG. 1). 43
is a hydraulic cylinder for extending and retracting the folding boom section 2, which is installed inside the folding boom section 2.

Reference numeral 44 denotes an oil supply pipe to the hydraulic cylinder 43, which is a flexible pipe 45 extending from the swivel base C side to the base end of the base part 3 of the base boom section 1, and a flexible pipe 45 extending from the base end of the base part 3 to the tip end. from the fixed piping 46 to the base part 3 and the connecting rod 38 (connecting rod 3
The flexible piping 47 is guided and supported by the folding boom section 8 and extends to the proximal end of the folding boom section 2.

48 is a wire rope that is wound up and unwound by a winch 49 provided on the swivel base C, and this wire rope 48 is passed from the winch 49 to the lower side of the base boom section 1, the folding pulley 40, and the folding boom section. The folding boom section 2 is hung from the lower side (upper side in the state shown in FIG. 1) of the folding boom section 2, passes through the end pulley 35 of the gooseneck section 34, and reaches the hook block suspended from the end of the folding boom section 2. There is. The wire rope 48 that passes through the lower side of the base boom section 1 is connected to the pulley 28, and the wire rope 48 that passes through the lower side (the upper side in the state of FIG. 1) of the folding boom section 2 is connected to the pulley 41.
and 42 will guide you along the way. The wire rope 48 pulled out from the end pulley 35 of the gooseneck section 34 has its end fixed to the swivel base as follows when the foldable boom D is folded. That is, the wire rope pulled out from the tip pulley 35 is hung around a folding guide 50 provided on the side surface of the outer boom portion 26 of the folding boom section 2, and then fixed at a proper position on the swivel base C. . Such a configuration allows the wire rope 48 pulled out from the tip pulley 35 to be folded easily and connected to the boom section 2.
This is to prevent the wire rope 48 from being damaged.

The foldable boom having the above configuration is in the state shown in Figure 1 when the mobile crane A is to be moved, and when the crane is to be used for crane work, the base boom section 1 is adjusted in elevation and the folding boom section 2 is Adjust the swivel, rotate the swivel base C,
In addition, a winch 49 is used to drive up and lower a hook block suspended from the tip of the folding boom section 2.

Next, the features of the present invention will be explained. The purpose of the present invention is to provide a foldable boom as described above.
As stated at the beginning, the aim is to enable cargo handling near the tip of the base boom section 1, and in order to achieve this purpose, the folding boom section 2 of the above-mentioned folding boom D is used. A wire rope lead-out pulley 51 is provided on the bracket 33 at the base end. This wire rope lead-out pulley 51 is connected to the folding pulley 40 provided on the support shaft E when the folding boom section 2 is inverted and folded along the base boom section 1 (the state shown in FIG. 1). The folding boom section 2 is provided at a position biased toward the proximal end and downward. In this embodiment, such a position coincides with the position of a shaft 39 that pivotally connects the connecting rod 38 and the bracket 33, so the wire rope lead-out pulley 51 is provided on this shaft 39. 52 is a wire rope end stop provided at the base end of the folding boom section 2. This wire rope end stop 52 prevents the wire rope 48 from twisting when the hook block F suspended from the back of the base end of the folding boom section 2 rotates as shown by the dashed line in FIGS. 1 and 3. As such, it is located on the proximal end of the folding boom section 2 sufficiently biased toward the distal end of the folding boom section 2 from the position of the wire rope lead-out pulley 51. In this embodiment, the cable end stop 52 includes a member 52' that is welded to the side surface of the bracket 33 and projects from the side surface, and a plate member 52'' that is welded to the outer end of this member 52' and parallel to the bracket 33.
(Figures 3 and 4). Board material 5
2'' has a hole P, and the structure is such that the cable end fitting of the wire rope 48 is pinned to this hole.The structure of such a cable end fixing is such that the cable end of the wire rope 48 is folded and attached to the boom. This has the effect that it can be placed at any position on the proximal end of 2.

When handling cargo near the tip of the base boom section 1, put the folding boom section 2 in the folded position and then pull the wire rope 48 pulled out from the winch 49 onto the underside of the base boom section 1 and the folding pulley 40. , wire rope lead-out pulley 5
1 and led out to the back side of the base end of the folding boom section 2, the hook block F is suspended by this wire rope 48, and its cable end is fixed to the cable end stopper 52. (Single-dot chain diagram shown in Figures 1 and 3) After doing this, the base boom section 1 is adjusted in elevation, the swivel base C is rotated, and the winch 49 is used to hoist and lower the hook block F. Baggage can be handled near the tip of section 1.

In the above embodiment, the folding pulley 40 is provided on the spindle E, but the folding pulley 40 is placed on the bracket 5 which is the tip of the base boom section 1 near the spindle E, or on the two folding boom sections. Of course, it may be provided on the bracket 33 which is the end portion. Further, in the above embodiment, a support tube 4 is provided at the tip of the base boom section 1, and the base end of the folding boom section 2 is attached to the support tube 4 on the support shaft E.
However, the base end of the folding boom section 2 is connected directly to the tip of the base boom section 1 without providing the support tube 4, and the base end of the folding boom section 2 is attached to the support shaft E.
Of course, a hydraulic cylinder may be interposed between the base boom section 1 and the folding boom section 2 at a suitable location in addition to the pivot connection.

In any case, the folding boom of the mobile crane according to the present invention consists of a base boom section whose base end is connected to a swivel base rotatably mounted on a vehicle in a manner that allows adjustment of elevation, and a base boom section. Its proximal end is pivoted to the distal end of the base boom section via a spindle so that it can rotate from below along the base boom section between an inverted and folded folded position and an unfolded unfolded position. A folding boom for a mobile crane comprising folding boom sections connected to each other and rotatably driven by a hydraulic cylinder, wherein the boom section is connected to the base boom section and the folding boom section is pivotally connected to the folding boom section. A folding pulley is provided near the axis, and a wire rope is installed on the base end of the folding boom section that is biased toward the base end of the folding boom section and downward relative to the folding pulley when the folding boom section is in the folding position. A lead-out pulley is provided, and the wire rope from the winch installed on the swivel base is passed through the lower side of the base boom section, the folding pulley, and the wire rope lead-out pulley to the back of the proximal end of the folding boom section in the storage position. The wire rope derived from this structure allows the lift block to be hoisted up, lowered and suspended freely, making it possible to carry out crane work by suspending loads from the tip of the folding boom section, as well as to carry out crane work in which cargo is suspended from the tip of the folding boom section. Loads can be freely hoisted and lowered from the back of the base end of the boom section, allowing crane work to be carried out near the tip of the base boom section, and loads can be hung from the tip of the folding boom section. Compared to the conventional foldable boom, which can only be used for all crane operations, the crane operation range can be greatly increased by adding a simple structure, so it has a great practical effect.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a folding boom of a mobile crane of the present invention, and FIG. 1 is a side view of the folding boom in a folded state;
FIG. 2 is an explanatory diagram of the folding boom in an unfolded state. Figure 3 is an explanatory diagram of the folding boom in the state shown in Figure 1, viewed from the opposite side, Figure 4 is a plan view of Figure 3, Figure 5 is an enlarged view of the X section in Figure 3, and 6
The figure is a sectional view taken along the line Y-Y in FIG. Vehicle; B, swivel platform; C, foldable boom; D,
Base boom section; 1. Folding boom section; 2. Support shaft; E. Hydraulic cylinder; 7. Folding pulley; 40. Wire rope lead-out pulley; 51. Wire rope; 48. Hook block;

Claims (1)

[Scope of utility model registration request] A base boom section whose base end is connected to a swivel base rotatably mounted on a vehicle so as to be adjustable in elevation, and a folding position where the base boom section is inverted and folded from below along the base boom section. a folding boom section whose proximal end is pivotally connected to the distal end of the base boom section via a support shaft so as to be able to rotate between the folding boom section and the unfolded deployed position; A foldable boom of a mobile crane, in particular, a winch installed on a swivel base, on the underside of the base boom section, on or near the support shaft that pivotally connects the base boom section and the folding boom section. The structure is such that a hook block can be suspended from the tip of the folding boom section by a wire rope pulled out to the tip of the folding boom section through a folding pulley installed at the tip of the folding boom section and a tip pulley provided at the tip of the folding boom section. In the folding boom of a mobile crane, the folding boom section is located at the base end of the folding boom section, which is biased toward the base end of the folding boom section and downward relative to the folding pulley when the folding boom section is in the folding position. A wire rope lead-out pulley is provided opposite to the pulley, and the wire rope from the winch is passed through the lower side of the base boom section, the folding pulley, and the wire rope lead-out pulley to the base end of the folding boom section at the folding position. A folding boom for a mobile crane, characterized in that the boom block is led out to the rear of the mobile crane, and the lead-out wire rope is used to hoist and lower a hook block and freely suspend it.