JPH078630Y2 - Joint structure of pumping hose for ground excavator - Google Patents

Description

Detailed Description of the Invention << Prior Art >> A ground excavator includes an excavator main body having a hydraulically driven cutter at a lower portion, a hanging crane for suspending the excavator main body through a wire, and the cutter. It is equipped with a hydraulic drive type mud pump and a mud pipe connected to the mud pump to collect the earth and sand excavated by the above together with mud on the surface side.

This mud pipe consists of a fixed pipe fixed inside the excavator body and a plurality of additional pipes of about 5 m in length that are flange-bonded to the upper part of the fixed pipe as the excavator body descends. There is.

However, when replenishing this additional pipe (removing it when rising), one part of the excavation work must be interrupted and the additional work (removal work) must be performed.
It was a cause of a decrease in work efficiency.

Therefore, it has been proposed to use a flexible lifting mud hose instead of the replenishment pipe.

This hoisting mud has a length corresponding to the digging depth, and it is hung from a reel for hanging, and the hose is extended or hoisted by moving the reel up and down as the excavator moves up and down. Therefore, there is an advantage that the connection work can be omitted.

<Problems to be solved by the invention> However, the above-mentioned sludge hose is one in which flange joints are integrally provided at both ends of a hose body made of a material such as rubber, and a large number of hose bodies are connected through the flange joints. For this reason, the outer circumference of the flange joint is caught on the reel in a state where the reel is wound on the reel, and there is a drawback that feeding and winding are not smoothly performed.

Further, if the flange joint is forcibly wound in such a hooked state, the joint and the hose body may be damaged.

This invention solves the above-mentioned drawbacks, and provides a joint structure for a ground mud hoisting mud hose that enables smooth feeding and winding by eliminating the catch at the flange joint portion. With the goal.

<Means for Solving the Problem> In order to achieve the above object, the present invention provides a mud hose for lifting mud collected in an excavator body, and winding the mud hose on a reel for hanging. In a ground excavator that is held in a rotating state and is capable of feeding and winding the lift mud hose as the excavator main body descends or rises, the lift mud hose has flange joints at both ends of the hose main body. A plurality of hose bodies are connected to each other through the flange joint, and the outer diameter of the hose body near the flange joint is equal to or slightly smaller than the diameter of the flange joint. The bulged part was formed.

<Operation> According to the above configuration, the bulging portion near the flange joint eliminates the step between the flange joint and the hose body and becomes almost continuous with the hose body, so that the flange joint is not caught on the reel. Therefore, it is possible to smoothly perform the feeding operation and the winding operation.

<< Embodiment of the Invention >> An embodiment of the invention will be described below in detail with reference to the drawings.

FIG. 1 shows the overall construction of a hydrophrase type ground excavator to which the present invention is applied.

In the figure, this ground excavator comprises an excavator main body 2 having a pair of hydraulically driven cutter drums 1 at the bottom, and a hanging crane 4 for suspending the excavator main body 2 through a wire 3 so that the excavator main body 2 can be lifted and lowered. And a hydraulic drive type mud pump for collecting earth and sand excavated by the cutter drum 1 on the ground side together with mud in the excavator main body 2 and a mud pipe connected to the mud pump. Is also omitted).

A lifting mud hose 5 is connected to the upper end of the lifting mud pipe.

The lifting mud hose 5 is a reel 7 suspended from the crane 4 via a wire rope 6 for suspension so as to be lifted and lowered.
A fixed point 8 which is suspended in the state of being wound up and the other end is provided on the ground side.
, And the discharge end side is connected to a recovery tank (not shown).

A load meter 9 is provided at the suspended end of the wire rope 6, and a value measured by the load meter 9 is sent to a torque winch 10 for winding and unwinding the wire rope 6, and the torque winch 10 side. Then, in order to keep the measured value of the load meter 9 constant, the wire rope is unwound and wound by the rotation which is feedback-controlled to reel 7
Is lowered or raised, whereby the lifting mud hose 5 is continuously fed and wound with a constant tension.

In the figure, assuming that the reel 7 is located near the highest position and the excavation depth of the excavator body 2 is L,
It is held at a height of 1/2 L at the highest position.

Then, as the excavation progresses from this state, the excavator main body 2
Is lowered, the reel 7 is sequentially lowered, and the lifting mud hose 5 is fed while maintaining a constant tension. On the contrary, at the time of ascent, both are raised to lift the mud hose 5 while keeping the tension constant.

The above-mentioned lifting mud hose 5 is not a single piece, but a large number of lifting mud hoses 5 are connected to each other. As shown in FIG. 2, it is made of a composite material in which rubber is lined with a reinforcing cord, a reinforcing wire and the like. It consists of a hose body 12 with a length of about 20 m, a metal tube portion 14 provided on the inner circumference of the opening of both ends of the hose body 12, and a flange joint 16 integrally welded to the end surface of the metal tube portion 14. By connecting a large number of hose bodies 12 via the flange joints 16 to each other, the sludge hose 5 having a length corresponding to the excavation depth L can be obtained.

Then, in the vicinity of the flange joint 16 of the hose body 12, a bulging portion 18 which bulges continuously from the outer periphery of the hose body 12 in a bulb shape is formed.

The bulb-shaped bulging portion 18 is provided with a constriction between the flange joint 16 and the flange joint 16 in order to allow the insertion of bolts and the tightening of nuts when connecting the flange joint 16. It does not necessarily have to be bulbous as long as work is possible.

The diameter of the bulging portion 18 is set to be equal to or slightly smaller than the diameter of the flange joint 16 to eliminate the step between the flange joint 16 and the hose body 14.

That is, as shown in FIG. 3, in the state in which the coupling portion of the flange joint 16 is located on the upper half side of the reel 7 about half the circumference,
In the case of a normal hose having no bulging portion 18, the outer peripheral portion of the flange joint 16 contacts the upper arc surface of the reel 7 and smooth rotation becomes possible.

However, in this embodiment, since the bulging portion 18 is in contact with the upper arc surface of the reel 7 and continues to the hose body 14, the rotation is smooth, and the smooth feeding and winding work can be performed, and the hose body 12 and Damage to the connecting portion with the flange joint 16 is prevented in advance.

In the above embodiment, the bulging portion 18 does not necessarily have to be integrated with the hose body 14, and the bulging portion can be configured by fitting and bonding a separate component.

<Effects of the Invention> As described in detail in the above embodiments, in the joint structure of the mud hose for a ground excavator according to the present invention, the bulging portion near the flange joint is a step between the flange joint and the hose body. It is possible to solve the above problem and to be continuous with the hose body, without the catch of the flange joint and the reel, to smoothly perform the feeding and winding operation, and to further improve the work efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the overall structure of a ground excavator to which the present invention is applied, FIG. 2 is a partial cross-sectional side view of a lifting mud hose, and FIG.
The figure is a partially enlarged view showing the relationship between the reel and the lifting mud hose. 1 ... Cutter drum, 2 ... Excavator body 5 ... Lifting hose, 7 ... Reel 12 ... Hose body, 16 ... Flange joint 18 ... Swelling part

Claims (1)

[Scope of utility model registration request] 1. An excavator main body is provided with a lifting mud hose for lifting the collected mud water, and the lifting mud hose is held in a wound state on a reel for hanging, and the excavator main body is lowered or raised. In the ground excavator configured to feed and wind the lift mud hose, the lift mud hose has flange joints at both ends of the hose body, and connects the plurality of hose bodies to each other through the flange joints. The ground excavation characterized in that a bulge portion having a diameter equal to or slightly smaller than the diameter of the flange joint is formed on the outer peripheral portion of the hose body near the flange joint. Joint structure of hoisting mud hose for machine.