JPS61197392A - Horizontal shifter for truck 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] <Industrial Application Field> The present invention relates to a lateral movement device for a truck crane, and in particular, to a device that smoothes the movement of a vehicle body frame and is capable of responding to various types of movement. .

<Prior Art> Recently, truck cranes have tended to be built in larger buildings due to the demand for greater capacity, and this has led to problems in moving them around narrow construction sites.

In order to solve this problem, conventionally, a pair of left and right cylinder-driven outrigger beams were installed in each outrigger box installed at the front and rear of the truck crane body frame, and at the end of each outrigger beam. With the jack attached and the jack stretched above the ground to keep the car body frame floating, extend or shorten the left and right cylinders by extending the left and right cylinders and simultaneously shortening the other side to extend or shorten the left and right outrigger beams. It is being considered to move the

However, in this lateral movement means, the lower inner end of the hour trigger beam and the upper open end of the outrigger box contact the inner surface of the box and the outer surface of the beam, respectively, but the load of the truck crane acts on these contact parts. As a result, the sliding frictional resistance between the outrigger box and the outrigger beam is considerably large, resulting in problems in that lateral movement cannot be performed smoothly and a large and powerful cylinder is required.

As a means to solve the above-mentioned problems, it has been considered to provide a co-op for the outrigger beam and the outrigger box. A core is provided between the outrigger beam and the outrigger box to reduce frictional resistance when the outrigger beam moves.

<Problems to be Solved by the Invention> The above means of providing rollers between the outrigger box and the outrigger beam can reduce the frictional force when the outrigger beam expands and contracts, but when the crane is used, the load of the truck crane is - It is supported by the outrigger beam through the rollers, that is, it is supported by line contact between the core a, the outrigger beam, and the outrigger box.
A large load acts locally, creating new problems such as ensuring the rigidity of the contact area and reliability. Also, when moving a truck crane laterally, it is important to accurately synchronize the left and right outrigger beams with the same equipment.
This is necessary in order to avoid unexpected loads on the outrigger box and further damage, and such a function is required in addition to the synchronized movement of all outrigger beams and the movement of each individual beam.

The present invention has been made in view of the above circumstances, and it is possible to maintain the smooth sliding of the outrigger beam and outrigger box in a truck crane, and to expand the load supporting surface when the crane is in use. At the same time, the right and left outrigger beams are synchronized to extend,
The purpose is to shorten the length.

Means for Solving Problems> The structure of the present invention that achieves the above object is to provide a pair of left and right outrigger boxes that are extendable and retractable in the left and right direction in each of the outrigger boxes provided at the front and rear parts of the body frame of the truck crane. The outrigger beams are stored, leg members are attached to the ends of each outrigger beam so that they can move up and down, and cylinders that expand and contract these are connected to the left and right outrigger beams, respectively.
A hydraulic circuit is configured to operate each cylinder independently, all in synchronization, or in synchronization for left and right sides separately, and a slide plate made of a low-friction material is provided between the outrigger box and each outrigger beam. It is found in the lateral movement device of truck cranes.

Function> In the truck crane lateral movement device with the above configuration, a slide plate with a small friction coefficient is provided between the outrigger beam and the outrigger box so that both slide through this slide plate. The frictional resistance when the outrigger beam expands and contracts can be kept small, and the load of the truck crane when the crane is in use is borne by the slide plate.

Improved reliability. In addition, the cylinders for operating the outrigger beams on the left and right sides of the front and rear are synchronized with the hydraulic circuit, so the expansion and contraction of the outrigger beams is smooth, and unexpected forces are not applied to the outrigger beams and outrigger box. This will ensure that the

<Example> Fig. 1(a) shows a truck crane lateral movement device according to an example as seen from the back of the truck crane.
Figure (b) shows an enlarged view of the main parts, Figure 1 (C) shows an enlarged cross section of the slide plate, and Figures 2 and 3 show the state of the truck crane when it is running and in use. show,
Fig. 4(a) shows a lateral movement state, Figs. 5 and 6 show schematic examples of hydraulic circuits, and Figs. 7 to 13 show examples of hydraulic circuits.

As shown in FIGS. 2 and 3, a truck crane has a crane 2 mounted on a vehicle frame 1 of a large truck. 3
4 is a crane operator's cab provided on the vehicle frame 1, 5 is a front wheel of the vehicle, and 6 is a rear wheel of the vehicle.

A front outrigger 7 and a rear outrigger 8 are attached to the front (immediately behind the front wheels 5) and the rear (immediately after the rear wheels 6) of the vehicle, respectively.

Since both the front and rear outriggers 7.8 have the same structure, only one side will be described here.

The vehicle frame l and the outrigger stay 9 integrated with it are provided with outrigger boxes IOR and IOL each having a rectangular cross section and a cylindrical shape.
The two right-side outrigger boxes IOR, which are installed front and rear in the left-right direction of the vehicle, have their right ends open, and the left-side outrigger boxes IOL have their left ends open.

Outrigger beams IIR and III are housed in these outrigger boxes IOR and IOL so that they can be moved in and out, and each outrigger beam IIR and IIL and outrigger boxes 10R and 210L are connected to a hydraulic cylinder 12.
They are connected by R and 12L. Therefore, hydraulic cylinder 1
2R, 12L telescopic operation, outrigger beam II
R and IIL are sent in and out of outrigger boxes IOR and IOL. Each outrigger beam 118°11
A vertical cylinder 13R, 1 is provided at the outer end of L as a leg member.
3L are installed respectively.

Legs 14R, 141, which are grounded on the ground, are attached to the movable lower ends of the vertical cylinders 13R, 13L.

At the lower inner ends of the outrigger beams IIR, IIL and at the upper opening ends of the outrigger boxes IOR, IOL, there are sliding plates 15 made of a low-friction material with an extremely small coefficient of friction.
16 is installed. The attachment of the slide plate 150 to the outrigger beams 11R, IIL and the attachment of the slide plate 16 to the outrigger boxes IOR, IOL are performed by welding, bolting, or the like.

The low-friction material used for the slide plates 15 and 16 is 1.
For example, an oil-free material as shown in FIG. 1(C) may be used. This is made by providing a sintered lubricant layer 19 on the back metal 17 via a welding layer 18, and the friction coefficient of the surface is O,OS ~ 0-20<, which is 0.47 of the steel material.
The Iζ is much smaller than that of the steel, and since its surface is made of sintered material, it has high hardness.

When moving this truck crane horizontally, it is necessary to operate the cylinders for the front and rear left and right outrigger beams in synchronization. When hydraulic pressure is applied to the shortening side of one of the left and right hydraulic cylinders, the piston rod of that cylinder is returned and the pressure oil discharged is supplied to the extending side of the other cylinder, or The opposite can be considered.

The schematic hydraulic circuit shown in FIG. 5 shows the former. For example, the front and rear left cylinders 12FL and 12R
When pressure oil is supplied to the shortened side of L, the pressure oil on the extended side is discharged and supplied to the extended side of the cylinders 12FR and 12RH on the front and rear right sides.

The shortening of the left cylinders 12FL and 12RL and the expansion of the right cylinders 12FRe and 12RH are performed synchronously.

What is shown in Figure 6j is an example of the opposite of the above.

Front and rear right cylinder 12FR, 12in (D extension f1
When pressure oil is supplied to M, the pressure oil on the shortened side is discharged to the front and rear left cylinders 12F4. , reached 12R1°,
In the end, the expansion of the right cylinders 12FR and 12nn and the shortening of the left cylinders 12FL and 12R1 are performed in synchronization. In addition, in Fig. 5.6, 20 is an oil tank and 21 is a pump.

Next, the lateral movement of the truck crane will be explained. Incidentally, cases in which the truck crane needs to move laterally include entering or exiting a place where the truck crane vehicle cannot turn and enter.

Figure 4 (a) shows one mode of lateral movement;
shows a state in which the front and rear outrigger beams 11L on the left side are extended and the outrigger beams IIR on the right side are shortened.

Note that the vertical cylinders 13R and 13L at the ends of each beam are extended and projected above the ground, and the vehicle is in a floating state 1c.

From this state, the left cylinders 12FI, , l2RL
(See Figure 5.6) At the same time, the right cylinders 127B and 121R are shortened.At the same time, the left outrigger beam IIL moves into the outrigger box 10L, and the right outrigger beam IIR moves into the outrigger box 10L. The outrigger beams IIR and III extend from the outrigger box IOR, and the ends of the outrigger beams IIR and III are fixed on the ground. The entire vehicle (one vehicle frame) is moved to the left. In the figure, %Ll #L* indicates the distance between the center line of the truck crane's body and the tip of the right outrigger beam IIR, and the difference Lt-Ll is the amount of movement of the truck crane.

The above lateral movement is performed with the weight of the vehicle being applied to the outrigger boxes IOR and IOL.

As shown in Fig. 1(b), the outrigger beam]lR2
Lower inner end of 11L and outrigger box 1011°10
1 inner bottom, outrigger box IOR, 10t.

The upper part of the opening of the box rubs against the upper surface of the outrigger beams IIR, IIL, but as mentioned above, the lower inner end of the outrigger beam IIR, IIL and the upper part of the opening of the outrigger box IOR, IOL are made of low-friction material. Since the slide plates 15 and 16 are provided, the outrigger beam IIR
, IIL and the 7th trigger box IOR, 10L will slide very smoothly. In addition, as shown in Fig. 3, the left and right outrigger beams IIL and I
Extend IR and vertical cylinder 13L.

The load of the vehicle during crane work with 13R extended is received by the surface of the slide plate 15, 16, so there is no localized load and the strength and reliability during support is improved. Therefore, there is no need to provide a separate reinforcing means.

Of the hydraulic circuits shown in Figs. 7 to 13, those shown in Figs. 7 to 10 are of the type shown in Fig. 5, and those shown in Figs. 11 to 13 are of the type shown in Fig. 6. It is of the form shown by Cζ.

In the hydraulic circuit shown in FIG. 7, FIG. 7(a) shows a neutral state. In this figure, 20.21 is the same tank and pump as above, and 12FL.

12FR is the cylinder for the front left and right outrigger beams,
12uL and 12RR are rear left and right outrigger beam cylinders, 13FL and 13FR are front and rear vertical cylinders, 13RL and 13RR are rear vertical cylinders @F), 22 is an outrigger control valve and a switching valve 22a,
22b, 22c, 22d, and 22e, 23 is a left/right movement direction switching valve, and 24 is a movement type (normal movement, lateral movement) switching valve.

In the above hydraulic circuit, when all the outrigger beam cylinders are extended.

As shown in FIG. 7, the switching valves 22a~ of the control valve 22
22d is in the position ■, the switching valve 22e is in the position ■, the left/right movement direction switching valve 23 remains in the position ■, and the moving method switching valve 24 remains in the [phase] position. In this state, pressure oil is supplied to the extension side of each cylinder 12, and each cylinder is extended.

In the above state, the switching valves 221 to 22d in the control valve 22
When the position is set to ■, pressure oil is supplied to the extension side of each vertical cylinder 13, and the vertical cylinders 13 are stretched above the ground. Moreover, when the switching valve 22e is set to the position ■, the vertical cylinder 13
Pressure oil a is supplied to the shortened side of the vertical cylinder 13, and the vertical cylinder 13 is shortened.

When all the cylinders 12 for outrigger beams in the control valve 22 are in the extended state (FIG. 7 Φ), when the switching valve 22e is set to the position ■ as shown in FIG. Pressure oil is supplied to the shortening side,
All outrigger beams 11 are outrigger boxes 1
Stored at 0.

From the state shown in FIG. 7(d), the outrigger box lO
To move the vehicle frame 1 to the right with the
), the switching valves 22a to 2 in the control valve 22
2d is set to the position ■, the switching valve 22e is set to the position ■, the switching valve 23 is set to the position ■, and the switching valve 248 is set to the position ■.

When the valves are switched and controlled as described above, pressure oil is supplied to the contraction side of the right front and rear cylinders 12FR and 121R, and pressure oil is supplied to the extension side of the cylinders 12FR and 12RH to the left front and rear cylinders 12FL and 12RI.

Therefore, cylinder 1 on the right side
27R and 12RR have been shortened, and the left cylinder 12FL
, 12RL are shortened so that the vehicle frame l together with the outrigger box lO is moved to the right.

When moving to the left side of the vehicle frame 1, P from the state shown in Fig. 7 (0), as shown in Fig. 7 @,
), the switching valve 23 may be set to the [F] position.

Figure 8 shows another hydraulic circuit of the same type, with a moving type switching valve 24.
The switching valve 242 and 24b are divided into two interlocking switching valves 242 and 24b, and their function is the same as that shown in FIG.

The one shown in FIG. 9 is one in which the left/right movement direction switching valve 23 is divided into two interlocking valves 23a and 23b), and the one shown in FIG.

A switching valve 23a that interlocks switching valves 23 and 24.

23b, 24a, and 24b.

The operation of these hydraulic circuits is the same as that shown in FIG.

The ones shown in Figures 11 to 13 are of the type shown in Figure 6, which supplies pressure oil to the extension side of the front and rear right or left side of the tab 91, and directs the discharged pressure oil to the contraction side of the other side. 25 is a left/right movement direction switching valve, 26
A, 26b, 26c, and 26d are interlocking type switching valves, and 26 is a single moving type switching valve.

The valves are operated from the driver's cab, etc.

According to the truck crane lateral movement device according to the present invention, a slide plate made of a low-friction material is provided at the sliding contact portion of the outrigger box and the outrigger beam, so that the movement of the outrigger beam can be performed using conventional rollers. Since the load is received through the surface of the slide plate, reliability in terms of strength is improved, and there is no need to take into account rigidity as in conventional models. It becomes like this. Furthermore, since the front, left, and right sides of the outrigger beam cylinder are synchronized, the movement of the outrigger beam is stabilized, and no unexpected force is applied to the outrigger beam or outrigger box.

[Brief explanation of drawings]

FIG. 1(a) is a front view of a truck crane lateral movement device according to an embodiment of the present invention, FIG. 1(a) is an enlarged view of the main parts thereof, and FIG. , Figures 2 and 3 are perspective views of the truck crane when it is running and in use, Figures 4 (a) and (b) are front views of the lateral movement process, and Figures 5 and 6 are hydraulic circuit diagrams. Schematic diagrams, figures 7 to 13
The figure is a hydraulic circuit diagram. In the drawing, l is the vehicle frame and 7.8 is the outrigger. 10L, IOR is outrigger box, 11L,
IIR is an outrigger beam. 12L and 12R are cylinders for outrigger beams. 15 and 16 are slide plates.

Claims (1)

[Claims] A pair of left and right outrigger beams are housed in outrigger boxes provided at the front and rear of the truck crane body frame, respectively, so that they can expand and contract in the left and right directions, and leg members are attached to the ends of each outrigger beam so that they can move up and down. The left and right outrigger beams are connected to cylinders that extend and retract these beams, forming a hydraulic circuit that operates each cylinder independently, all of them synchronously, or separately for the left and right sides. A lateral movement device for a truck crane characterized by having a slide plate made of a low-friction material provided between the beam and the beam.