JPS6016628Y2 - Oil supply device to the preceding boom in a multi-stage telescopic boom - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an oil delivery device for sending pressurized oil to a working machine attached to the tip of a multi-stage telescopic boom or to a hydraulic cylinder installed in a membrane boom. be.

(Prior technology) Conventionally, this type of oil feeding device to the tip of a multi-stage telescopic boom is as follows:
As shown in FIG. 1, a system in which an oil supply hose is directly suspended, or as shown in FIG. 2, a system in which a hose reel containing a spiral spring is provided at the base end of a telescoping boom are known.

(Problems to be solved by the invention) However, in the oil supply system in which the oil supply hose is directly suspended, there is a drawback that the oil supply hose is easily damaged due to contact with equipment installed on the ground, and the hose reel In the oil supply device using the oil supply hose, there is a problem that the device becomes large because the winding force of the oil supply hose relies on a spiral spring.

In addition, it is extremely difficult to design the winding force of the spiral spring to an optimal value, taking into account the bending resistance of the hose when winding up the hose under high pressure, and the spiral spring malfunctions. Such problems were occurring.

Therefore, the present invention is designed to prevent damage caused by contact with other equipment.
The object of the present invention is to provide an oil supply device for a leading membrane boom in a multi-stage telescopic boom that operates reliably.

(Means for Solving the Problems) The present invention is constructed as follows in order to solve the problems of the prior art.

That is, it is an oil supply device for a leading membrane boom in a multi-stage telescopic boom in which one or more booms are arranged in a telescopic manner on a base boom, and the oil supply device is a device for supplying oil to a leading membrane boom in a multi-stage telescopic boom in which one or more booms are arranged in a telescopic manner on a base boom. a movable pulley provided movably; a fixed pulley provided on the base boom at a position closer to the base end than the movable pulley; one end fixed to a position closer to the base end of the base boom;
From there, the movable pulley and the fixed pulley are looped around in order, and the other end is fixed to the front membrane boom, and when the multi-stage telescopic boom is contracted, the multi-stage telescopic boom is retracted. The movable pulley is configured with a tensioning device consisting of a pulley and a rope for forcibly moving the movable pulley toward the tip of the base boom by an amount of 172 mm.

(Function) With this configuration, the fuel hose does not come into contact with equipment installed on the ground, and damage to the fuel hose can be prevented.

In addition, when the retractable boom is retracted, the refueling hose is forcibly retracted in conjunction with the telescopic boom's retraction movement, so it can be reliably retracted even if the internal pressure of the refueling hose increases and drag increases. Malfunctions such as slack in the oil feed hose can be prevented.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 3 and 4.

1 is a base boom, and 2 is a middle boom installed telescopically on the base boom 1.

Reference numeral 3 denotes a front membrane boom arranged in a telescopic manner on the middle boom 2.

These base boom 1, middle boom 2, and front membrane boom 3 form a multistage telescopic boom.

The middle boom 2 and the front membrane boom 3 are driven to extend and contract by a power unit (not shown).

Reference numeral 4 denotes a working machine attached to the tip of the first membrane boom 3, and pressure oil is sent to this working machine 4 by an oil supply hose 6 stretched between the base boom 1 and the first membrane boom 3.

8 is a movable pulley provided movably along the longitudinal direction of the base boom 1, and 7 is a fixed pulley provided on the base boom 1 at a position closer to the base end than the movable pulley 8.

The oil supply hose 6 has one end fastened 9 to a position near the base end of the base boom 1, and from there, the movable pulley 8 and the fixed pulley 7 are looped around in this order, The other end is fixed 5 to the tip membrane boom 3.

10 is a rope. One end of this rope 10 is fixed 11 to the base end of the front membrane boom 3, and from there, a pulley 12 is placed at the tip of the middle boom 2, and a pulley 1 is placed at the base end of the middle boom 2.
3. The movable pulley 1 is placed on the same axis 15 as the movable pulley 8 after the suspension is sequentially turned around the pulley 14 placed at the tip of the base boom 1.
After the hanger is rotated at 6 and reversed, the other end is fixed 17 to the tip of the base boom 1.

The rope 10, pulleys 12, 13, 14, and movable pulley 16 are connected to an oil supply hose that forcibly moves the movable pulley 8 toward the tip of the base boom 1 in conjunction with the retraction movement of the multistage telescopic boom. It acts as a tension device.

Note that 18 is a guide groove for guiding and moving the shaft 15 in the axial direction of the telescopic boom.

Next, the operation of the present invention will be explained.

When shrinking the front membrane boom 3 into the middle boom 2,
Since one end of the rope 10 is fixed 11 to the base end of the leading membrane boom 3, the rope 10 is pulled into the middle boom 2 by an amount corresponding to the contraction stroke amount of the leading membrane boom 3 due to the contraction movement of the leading membrane boom 3. As a result, the movable pulley 16, which has rotated the rope 10, reaches the contraction stroke 2 of the front membrane boom 3.
/2 amount towards the tip of the base boom 1.

On the other hand, the oil supply hose 6 tends to slacken between the fixed pulley 7 and the front membrane boom 3 due to the contraction stroke of the front membrane boom 3;
The base boom 1 of the movable pulley 8 disposed on the same axis 15 as the movable pulley 16 is forced to move toward the tip of the base boom 1 of the movable pulley 16.
It is designed to be absorbed by movement toward the tip.

This allows the oil supply hose to supply oil to the front membrane boom 3 while maintaining a constant tension without sagging.

When reducing the middle boom 2 into the base boom 1,
Because the rope 10 is pulled into the base boom 1 by the amount of the contraction stroke of the middle boom 2 due to the retraction movement of the middle boom 2, the movable pulley 8 moves into the base boom 1 in the same manner as when the front membrane boom 3 is retracted. As a result, the slack in the oil supply hose is absorbed, and oil can be supplied to the membrane boom 3 while maintaining a constant tension.

The above description is about the case where the multi-stage telescopic boom retracts, but when the telescopic boom extends, the rope 10 that was on the pulling side when retracting is on the slack side, and the rope 10 that was on the slack side when retracting is Although the oil hose 6 changes to the pulling side, the oil supply hose 6 can always maintain a constant tension state, similar to when the multi-stage telescopic boom is contracted.

Although the case of a three-stage telescopic boom has been described above, it goes without saying that the present invention can also be applied to a multi-stage telescopic boom having three or more stages.

Further, although the embodiment has been described in which the movable pulleys 8 and 16 are arranged on the same shaft 15, they may be arranged in the direction of extension of the boom and connected using a connecting rod as shown in FIG.

Furthermore, it is also possible to use a hose for draining oil instead of the rope 10.

Furthermore, the hoses may be made into two hoses, one for oil supply and the other for oil drainage.

(Effects of the invention) The oil supply device to the front membrane boom of the multi-stage telescopic boom of the present invention prevents the oil supply hose from coming into contact with various equipment and being damaged, and also allows the retraction of the oil supply hose to be reduced by reducing the size of the telescopic boom. It has the advantage of reliable operation because it can be forcibly performed in conjunction with the movement, and its practical effects are great.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a conventional oil feeding device 1, and FIG. 3 is an explanatory diagram of an oil feeding device of the present invention. FIG. 4 shows another embodiment. 1...Foundation boom, 3...Front membrane boom, 6...Oil supply hose, end...Moving pulley, 7
...Fixed pulley, 16...Movable pulley.

Claims (1)

[Scope of utility model registration request] An oil supply device for a leading membrane boom in a multistage telescopic boom in which one or more booms are arranged in a telescopic manner on a base boom, and is movable along the longitudinal direction of the base membrane boom. A movable pulley is installed on the base boom, and a fixed pulley is installed on the base boom at a position closer to the proximal end than the movable pulley. The pulley and the fixed pulley are turned in this order, and then the oil supply hose whose other end is fixed to the front membrane boom, and the two halves of the retracting movement of the multi-stage telescopic boom when the multi-stage telescopic boom is retracted. 1. An oil supply device for a tip boom in a multi-stage telescopic boom, comprising a tensioning device comprising a pulley and a rope for forcibly moving the movable pulley toward the tip of the base boom by an amount of .