JP3170770U - Agitation and drilling blade - Google Patents

Abstract

A distance between a stirring blade and a stirring / excavation blade is shortened to enhance a stirring effect. A stirring and excavating blade base material 14 is attached to a female joint 12 at a position higher than a hole 32 at a lower position of two holes 30 and 32 provided in the female joint 12. Conventionally, the mounting angle of the stirring / excavation blade base material 14 is inclined 30 ° forward in the rotational direction with respect to the plane perpendicular to the rotation center axis so that the stirring / excavation blade base material 14 and the holes 30, 32 do not interfere with each other. The mode is changed from the mode of 15 to the mode tilted forward by 15 ?. Since the projection area in the vertical direction is increased and the penetration resistance is increased by changing the mounting angle of the stirring and digging blade base material 14, a screw is provided on the outer peripheral surface of the female joint 12 below the stirring and digging blade base material 14. The blade body 16 is attached to improve the penetration force. [Selection] Figure 1

Description

The present invention relates to an improvement of an agitation / excavation blade that combines excavation of the ground and agitation / mixing of soil and ground hardening agent.

In ground improvement work, the agitation / excavation blade that performs excavation of the ground and agitation / mixing of the excavated soil and ground hardening agent at the same time comes into contact with the unexcavated ground first. Wear progresses quickly due to contact resistance with the gravel. Therefore, since the stirring and excavating blade body is a part with a very high replacement frequency, it has a structure that can be easily attached to and detached from the rotating shaft so that it can be quickly replaced on site (see Patent Document 1).

The attaching / detaching portion between the stirring and excavating blade body and the rotating shaft has a joint structure. Conventionally, a male joint 102 is provided at the lower end of the rotating shaft 100 as shown in FIG. A female joint 106 was provided above the head. The male joint 102 is provided with recesses 108 at two locations, and corresponding holes 110 are provided in the female joint 106. After fitting the male joint 102 and the female joint 106, the joints 102 and 106 are fixed by inserting pins into the holes 110 and the recesses 108, and the driving force of the rotating shaft 100 is transmitted to the stirring and excavating blade body 104. The When removing the stirring and excavating blade body 104, it is only necessary to pull out the pin and separate the joints 102 and 106 from each other.

JP 2005-139788 A

The agitation / excavation blade 104 excavates the ground while discharging the ground hardening agent, and further agitates and mixes the excavated soil and the ground hardening agent. The soil agitated and mixed by the agitation / excavation blade body 104 is further agitated and mixed by the agitation blade 112 attached to the rotary shaft 100 when the agitation / excavation blade body 104 is deepened. However, since the conventional stirring / excavation blade body 104 has a structure in which the female joint 106 extends upward, the entire length of the female joint 106 is between the stirring blade 112 and the stirring / excavation blade body 104. There was a gap. Since this gap portion has no stirring action, when the agitating and excavating blade 104 reaches the planned depth and the excavation is stopped, the soil existing in the gap portion is not sufficiently stirred and mixed, and only this portion is expected. There was a problem that the strength of the can not be achieved.

One way to solve or mitigate this problem is to reduce the gap as much as possible. For this purpose, it is effective to reduce the distance between the stirring blade 112 and the stirring / excavation blade body 104. In this case, it is more economical and time-consuming to modify the structure of the stirring and excavating blade body 104, which is a consumable item, than to modify the structure of the male joint 102 provided on the heavy machinery side having the rotating shaft 100. The burden on the ground improvement installer is small.

An object of the present invention is to shorten the distance between the stirring blade and the agitation / excavation blade and improve the agitation effect by modifying the shape of the agitation / excavation blade.

The stirring and excavating blade of the present invention includes a female joint that fits with a male joint provided at a lower end of a rotating shaft, at least two holes provided at a distance in the vertical direction in the female joint, and the female joint. A stirring and excavating blade base material attached to the outer peripheral surface of the joint, and a stirring and excavating blade body equipped with an excavating blade attached to the stirring and excavating blade base material, the stirring and excavating blade base material, It is attached to the said female joint in the position higher than the hole provided in the lowest position among the holes.

The stirring and excavating blade body of the present invention is attached near the lower end of the rotating shaft because the mounting position of the stirring and excavating blade base material with respect to the female joint is relatively higher than the hole compared to the conventional one. The distance to the agitated blade is shortened.

If the mounting position of the stirring and excavating blade base material is increased, it may interfere with the hole. In such a case, when the mounting angle of the agitating / excavating blade base material is changed from a conventional mode in which it is tilted 30 ° forward to the rotation direction side with respect to a plane perpendicular to the rotation center axis, to a mode tilted 15 ° forward Good.

Changing the mounting angle of the agitation / drilling blade base material to loosen the degree of forward tilt increases the projected area in the vertical direction, increasing the penetration resistance of the agitation / drilling blade to the soil and lowering the excavation efficiency Will do. In this case, the penetration force can be increased by attaching a screw-shaped blade body to the outer peripheral surface below the stirring and excavating blade base material of the female joint. This screw-shaped blade body reduces the friction between the female joint and soil, and also has a function of protecting the female joint from wear and wear.

Since the agitation effect is enhanced by reducing the distance between the agitating blade and the agitating / excavating blade, it is possible to improve the ground strength in the ground improvement work or the like.

The figure which shows the attachment / detachment structure of a rotating shaft and a stirring and excavating blade body Side view of stirring and excavating blade (a) Front view (b) Bottom view (c) The figure which shows the state which attached the ring to the female joint The figure which shows the attachment or detachment structure of the conventional stirring and excavation blade body

EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated referring attached drawing. First, the structure of the stirring and excavating blade will be described with reference to FIGS. 1 and 2. FIG. 1A shows a state in which a stirring and excavating blade body is attached to the tip (lower end) of the rotating shaft, and FIG. 1B shows a state in which the stirring and excavating blade body is removed.

The agitation / excavation blade body 10 includes an agitation / excavation blade base material 14 and a screw blade body 16 on the outer peripheral surface of a cylindrical female joint 12, and a penetration blade 18 at the lower end of the female joint 12. . The inner diameter of the female joint 12 is substantially the same as the outer diameter of the male joint 22 provided at the lower end of the rotary shaft 20, and when the male joint 22 is inserted into the female joint 12, both the joints 12 and 22 are fitted without a gap. . Circular recesses 24 and 26 are formed in the male joint 22 at two locations. One depression 24 is arranged near the upper end of the male joint 22. The other recess 26 is arranged near the lower end on the opposite side of the recess 24 with respect to the rotation center axis 28.

The female joint 12 has holes 30 and 32 penetrating in and out at two locations. These holes 30 and 32 are arranged so as to overlap the depressions 24 and 26, respectively, when the female joint 12 is fitted to the male joint 22. By inserting the pins 34 and 36 into the overlapping holes 30 and 32 and the depressions 24 and 26, the female joint 12 and the male joint 22 are fixed, and torque is transmitted from the rotary shaft 20 to the stirring and excavating blade body 10.

The stirring and excavating blade base material 14 is disposed on both sides of the outer peripheral surface of the female joint 12 with the rotation center shaft 28 interposed therebetween. The stirring and excavating blade base material 14 has a shape extending in the normal direction of the outer peripheral surface of the female joint 12, and the excavating blades 38 are arranged at substantially equal intervals in the normal direction on the side facing the rotation direction. It is attached with. One stirring / excavation blade base material 14 is arranged below the hole 30 so as not to interfere with the hole 30, and the other stirring / excavation blade base material 14 is arranged above the hole 32 so as not to interfere with the hole 32. Has been. Any of the agitating / excavating blade base materials 14 is attached in a posture inclined forward by 15 ° in the rotational direction with respect to a plane perpendicular to the rotation center axis 28. The excavation blade 38 is attached in a posture inclined forward by 35 ° with respect to the same plane.

A screw blade body 16 is attached below the stirring and excavating blade base material 14. The screw blade body 16 has a spiral shape that rises to the right from the lower end of the female joint 12 to just below the stirring and excavating blade base material 14, and the lower end (tip) is attached with an excavating blade 40 for biting into the soil. It has been. The screw blade body 16 has a function of converting a rotational force into a propulsive force into the ground, and can increase the penetration force of the agitation / excavation blade body 10 into the soil. Further, the screw blade body 16 also has a function of reducing friction between the female joint 12 and soil and protecting the female joint 12 from wear and wear.

The stirring and excavating blade body 10 is configured so that the stirring and excavating blade base material 14 attached to the female joint 12 at a position lower than the lower hole 32 in the conventional stirring and excavating blade body is attached at a position higher than the hole 32. As a result of the change, the position of the stirring and excavating blade base material 14 when the female joint 12 is fitted to the male joint 22 is very close to the stirring blade 42 located on the most distal end side of the rotary shaft 20. . As a result, the gap between the agitating / excavating blade body 10 and the agitating blade 42 that does not have an agitating action is greatly reduced. Therefore, when the ground improvement work or the like is performed using the agitating / excavating blade body 10. The stirring and mixing effect of soil and ground hardener can be enhanced.

Here, a problem in manufacturing the stirring and excavating blade body 10 will be briefly described. When the stirring and excavating blade base material 14 is welded to the outer peripheral surface of the female joint 12, the female joint 12 may be deformed by high heat during welding. A possible method for suppressing this deformation is to perform welding in a state in which the male joint 22 and the female joint 12 are fitted. However, depending on the degree of deformation of the female joint 12, the male joint 22 may not be extracted. There is sex. Therefore, as shown in FIG. 3, two ring members 44 and 46 having the same outer diameter as the upper end and lower end of the male joint 22 are fitted into the female joint 12 before welding inside the female joint 12. . In particular, the upper and lower ends including the opening that is likely to be deformed are reinforced by the ring members 44 and 46, so that the thermal deformation of the female joint 12 can be effectively suppressed. Moreover, since it is ring-shaped, even when it becomes impossible to extract, it can be easily cut and extracted.

DESCRIPTION OF SYMBOLS 10 Stirring and digging blade body 12 Female joint 14 Stirring and digging blade base material 16 Screw blade body 20 Rotating shaft 22 Male joint 28 Rotating central shaft 30, 32 Hole 38, 40 Excavating blade 42 Stirring blade 44, 46 Ring member

Claims (3)

A female joint fitted with a male joint provided at the lower end of the rotating shaft;
At least two holes provided in the female joint at a distance in the vertical direction;
Agitating and excavating blade base material attached to the outer peripheral surface of the female joint;
It has a drilling blade attached to the stirring and drilling blade base material,
The stirring / excavation blade body, wherein the stirring / excavation blade base material is attached to the female joint at a position higher than a hole provided at the lowest position among the holes. The said stirring and excavation blade base material is attached to the said female joint in the attitude | position inclined 15 degrees ahead to the rotation direction side with respect to the plane perpendicular | vertical to a rotation center axis | shaft. Agitation and drilling blade. The stirring / excavation blade body according to claim 2, wherein a screw-shaped blade body is attached to an outer peripheral surface below the stirring / excavation blade base material of the female joint.

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