JPS62105892A - Walking type crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mobile crane whose boom is slid back and forth depending on whether the crane is working or traveling.

(Prior Art) A mobile crane consists of a lower traveling body (wheel type or crawler type), an upper revolving body, a telescopic box-like telescopic boom (hereinafter referred to as
It is constructed by attaching a boom (simply called a boom). In this mobile crane, a longer boom is required for the purpose of increasing the working capacity. However, when driving on public roads (in the case of crawler cranes, transporting on public roads by trailer),
Because the amount of forward protrusion of the boom is limited by law, there is a limit to how long the boom can be, and the reality is that it cannot adequately respond to water sprinkling.

By the way, it is conceivable to increase the length of the boom by locating the boom foot 1- as far back as possible on the revolving upper structure, but this will reduce the rear stability during work (f
It has become impossible to implement this method for reasons such as poor performance.

(Object of the invention) Therefore, the present invention complies with the laws and regulations when driving on public roads, and
Further, it is an object of the present invention to provide a mobile crane that can realize a longer boom without causing problems such as low backward stability during crane work.

(Structure of the Invention) The present invention is characterized in that the upper revolving body of the base machine, which is composed of a lower traveling body and an upper revolving body, is provided with a telescoping boom that can be raised and lowered around a boom foot pin. In a mobile crane in which a boom hoisting cylinder is provided between the upper rotating body and the
A boom foot pin guide rail is provided at the rear of the rotating body in the front-rear direction, and the boom foot pin slides back and forth on this boom foot pin guide rail between the forward position during crane operation and the backward position during crane operation. A boom foot pin fixing means is provided for freely engaging the boom, supporting the boom to be slidable back and forth with the boom foot pin on the upper revolving body, and fixing the boom foot pin at the forward position F. Mobile Ri1non,
It is in.

(Example) In this example, a so-called wheel crane, which is smaller than a truck crane, is taken as an example of application. A is a base machine consisting of a lower traveling body A1 and an upper rotating body A2, B is a multistage telescopic boom provided on the upper rotating body A2, and C is a boom hoisting cylinder for raising and lowering the boom B.

The upper revolving body A2 has a cabin 2 at the front of the revolving frame 1.
, winch W1 at the rear. It is equipped with W2 etc. At the rear part of this swing 71 norm 1, on which the winches Vh and W2 are mounted, guide frames 11.11 having a mouth-shaped cross section are integrally provided on both left and right sides of the upper end, and inside the guide frame 11.11 on both sides, The upper and lower two pieces of equipment are installed parallel to each other and the boom foot pin guide rail (
A guide rail (hereinafter simply referred to as a guide rail) 12.12 is formed horizontally in the front-rear direction. Also, both side guide frames 1
A roller guide 13.13 is mounted on the top surface of 1.11.

Boom B includes a basic boom B1 and a multi-stage movable boom B2.
At the base end of the basic boom B1, a boom foot pin 3, which is the center of boom raising and lowering, is self-staged horizontally in the left-right direction. As shown in FIG. 5, the left and right ends of the boom foot pin 3 are engaged with the guide rails 12.12 on both sides of the swing frame \1 so as to be slidable back and forth, thereby causing the boom B to slide back and forth. It's getting wet.

In addition, a substantially rectangular anti-rotation plate 31 that engages with the guide rail 12, 12 is provided on both left and right end surfaces of the boom foot pin 3, and this plate 31 prevents the boom foot pin 3 from rotating when sliding back and forth. . Also,
When the boom B is in a horizontal position when the crane is running, the middle part of the basic boom B1 is supported by the boom rests 1 to 14 installed on the revolving frame 1, and the boom rest 14 and the boom foot pin 3 are connected to each other as a whole. It is supported in two places so that it can slide forward and backward.

The boom hoisting cylinder C is attached at the end to the rotating frame 1 and at the rod end to the tip of the basic boom B1. The boom B moves forward or backward in a horizontal position when the crane is traveling by the expansion and contraction force of the boom hoisting cylinder C. That is, part of the operating stroke of the boom hoisting cylinder C is used for moving the boom B back and forth, and the remaining slide is used for hoisting the boom B. Therefore, this boom hoisting cylinder C is longer than a conventional boom hoisting cylinder that only performs boom hoisting by the amount required for moving in front of the boom.

One end of the guide rails 12, 124 of the swing frame 1 is closed, and the front end of this guide rail becomes the maximum forward position of the boom foot pin 3 (hereinafter simply referred to as the forward position). As a means for fixing the boom foot pin 3 in this forward position, on the upper surface of the front end of the guide frames ii and i1 on both sides,
A fixed bin 4 is provided which is driven by a hydraulic cylinder 41. On the other hand, the front end of the guide rail 12.12 (6 and the bin holes 1 corresponding to the boom foot 1 to bin 3)
2a.

32 is provided, and the fixed bottle 4 is located in this bottle hole 12a.

32, the boom foot pin 3;
That is, the boom B is fixed at the forward position.

In this advanced position, the boom foot pin 3 and the boom B are in the same position as the boom foot pin and boom in a conventional crane, and the crane operation is performed in this position. When traveling, the boom foot pin 3 and the boom B move rearward (to the position where the boom foot pin 3 engages with the rear end of the guide rail 12.12) by the contraction force of the boom hoisting cylinder C, and It is held in this retracted position by cylinder C.

The overall length of the boom B is determined so that the forward protrusion amounts χ and χ' of the boom B comply with the legal regulations when traveling on public roads at this position (when the boom moves backward).

Therefore, when using this crane, if the forward protrusion amounts χ and χ' of the boom during traveling are the same as the forward protrusion amount of the boom of the conventional crane, the forward and backward movement of the boom B p! ! Only for γ,
The total length of the boom can be increased. In other words, the length of the boom can be increased (G, LT, compared to the conventional boom length of 9. .0m~33.4
m, the boom length of this crane is 11.0n ~ 4
1.0m) is realized.

5 is a gantry, and a sea 75 installed in this gantry 5
1.51, winch W1. Wire lobes R1 and R2 pulled out from W2 are passed toward the tip of the boom. The gantry 5 has an M end pivotally attached to the base end of the v-boom B1 so as to be rotatable around a horizontal axis, and an intermediate part supported by a bracket 5a protruding from the base end of the basic boom B1. has been done.

Further, a pair of left and right guide rollers 53, 53 are rotatably attached to the bracket 1 at the lower middle of the gantry 5 via 52. This guide roller 53.53 is located at the rear of the boom when the boom B is in the rearward position, and is located at the guide frame i1. When the seam B moves forward facing the roller guide 1.3.13 provided on the -F plane of ii, as shown in FIGS. 2 and 6, this roller guide 13.
13 and transfer the upper surface of guide frame 11.11.

The gantry 5μ moves back and forth with the boom B in a constant posture, is supported only by the bracket 5a in the boom retracted position, and is supported by the bracket 5a and the guide O-ra 53 during the movement, and the guide roller 53 when the boom B is raised in the forward position. Each is supported only by

Note that 01.02 is a lobe guide roller, one guide roller q1 is attached to the revolving frame 1, and the other guide roller Q2 is attached to the upper part of the boom foot so that it can move together with the boom B.

Other Embodiments (I) As shown in FIGS. 7(A) and 7(B), a bracket 6 for attaching a boom hoisting cylinder is provided on the bottom surface of the boom B1 in the front and rear direction, and this bracket 6 is provided with a boom hoisting cylinder. The bin D1 installed on the rod of the cylinder D can be slid back and forth freely.The bin D1 is fixed in position at the front end of the bracket 6 when the crane is running, and the cylinder D is extended when the crane is working. After the boom B is moved forward, the bin D1 may be unfixed, the cylinder D may be contracted, the bin D1 may be moved toward the rear end of the bracket 6, and the position may be fixed. .

As a means for fixing the bin D1, a hydraulic cylinder-driven or manual fixing bin can be used.

With this configuration, the first stroke of the boom hoisting cylinder D for boom hoisting can be used as is for moving the boom back and forth, so the length of the boom hoisting cylinder D is smaller than that of the boom hoisting cylinder C of the above embodiment. It's short and boring.

(It) In the above embodiment, the boom hoisting cylinder C1
D is provided forward (so-called forward push type), and the boom B is moved forward by the extension operation of this cylinder C1D.As shown in FIGS. 8(A) and (O), the boom hoisting cylinder E is It may be provided in a so-called push-back type so that the boom is moved backward by its extension operation.

(III) As a support means for the gantry 5, as shown in FIG.
A) As shown in (B), a link 7 is attached between the tip of the gantt 5 and the rear end of the swing frame 1 so that both ends can rotate around a horizontal axis, and the link 7 is installed in both the forward and backward positions of the boom. The link 7 may be used to support the gantry 5 in a substantially constant posture.

(IV) Furthermore, the gantry 5 may be fixed to the rear end of the swing frame 1 instead of being moved back and forth together with the boom B as in the above embodiment.

(A boom rest 1 is attached to the swing frame 1 as a means to support the middle part of the VOW main boom B1 so that it can slide forward and backward.
4 may be replaced with a roller.

(Vl) As a means for fixing the boom B in the forward position, a manually operated bin may be used instead of the hydraulic cylinder driven bin 4 shown in the above embodiment.

(Effects of the Invention) As described above, according to the present invention, the forward protruding suspension of the boom is retracted so as to comply with legal regulations when the crane is running, which causes disadvantages such as poor rear stability during crane operation. Since the boom is moved forward to a position suitable for the work without causing any damage, it is possible to increase the length of the boom, which was impossible with conventional cranes. Therefore, the crane performance can be improved, and especially in the case of wheel cranes such as small latte lane cranes, it is possible to obtain high crane capacity with a boom length comparable to that of a truck crane while taking advantage of excellent maneuverability. I can do it.

Moreover, since the boom hoisting cylinder can also be used for moving the boom back and forth, the structure is simple and the cost is low.

[Brief explanation of drawings]

Fig. 1 is an overall side view of a crane according to an embodiment of the present invention in a running position, Fig. 2 is an overall side view in the same working attitude, Fig. 3 is a partially enlarged view of Fig. 1, and Fig. 4 Figure 5 is a partially enlarged view of the state where the boom is moved forward from the state shown in Figure 3, and Figure 5 is a partially enlarged view of the state where the boom is moved forward from the state shown in Figure 3.
Figures v-vta and 6 are enlarged cross-sectional views taken along the V[-Vl line, respectively, and Figures 7 (a) and 7 (b) are diagrams showing other embodiments of the present invention relating to the mounting structure of the boom hoisting cylinder. 1 and 2, and FIGS. 8(a) and 8(b) are views corresponding to FIGS. 1 and 2 showing an embodiment in which the boom hoisting cylinder is mounted rearward. A... Base machine, A1... Lower running body, A2.
... Upper revolving structure, B... Boom, C, D, E... Boom hoisting cylinder, 1... Swivel frame, 3... Boom foot pin, 12... Boom foot pin guide rail, 14 . . . Boom rest, 4. Bin that fixes the boom foot pin in the forward position, 41. -- Hydraulic cylinder that operates the same bin.

Claims (1)

[Claims] 1. The upper revolving body of the base machine, which is composed of a lower traveling body and an upper revolving body, is provided with a telescoping boom that can be raised and lowered around a boom foot pin, and the boom and the upper revolving body are connected to each other. In a mobile crane in which a boom hoisting cylinder is provided in between, a boom guide rail is provided at the rear of the upper revolving structure in the front-rear direction, and the boom foot pin is attached to this boom foot pin guide rail in a forward position during crane work. and a retracted position during traveling, the boom is slidably engaged back and forth, and the boom is supported along with a boom foot pin on the upper revolving structure so as to be slidable back and forth, and the boom foot pin is fixed at the forward position. A mobile crane characterized in that a boom foot pin fixing means is provided.