Agitating – Having interrelated feed and discharge means – Including means to monitor or control operation
Reexamination Certificate
2002-02-25
2004-11-02
Drodge, Joseph (Department: 1723)
Agitating
Having interrelated feed and discharge means
Including means to monitor or control operation
C241S101740, C366S142000, C366S299000, C404S075000
Reexamination Certificate
active
06811300
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a rotational speed controller for mixing equipment of a soil modifying machine and an engine speed controller for a soil modifying machine.
BACKGROUND ART
Recently, soil modifying machines for modifying soil at a site to reuse soil occurring during construction are often used.
FIG. 8
shows a self-propelled soil modifying machine
1
as an example (for example, documents issued by Komatsu Ltd.). Soil, which is thrown into a raw soil hopper
16
by a loader such as a hydraulic shovel (not shown), is made to be of a predetermined thickness by a raking rotor
149
while being transported on a feed belt conveyor
130
and passes under a solidifying material hopper
2
. When the soil is on the feed belt conveyor
130
, a solidifying material feeder
148
is opened and solidifying materials are poured into the soil from the solidifying material hopper
2
. The soil and the solidifying materials fall onto a discharge belt conveyor
150
while being cut and mixed with a soil cutter
147
serving as a rotating rotary cutting mixer provided in the vicinity of a conveyor outlet of the feed belt conveyor
130
. When falling, grain diameters of soil covered with the solidifying materials become smaller by an impact of a rotary hammer
127
serving as a rotary impact mixer that is rotating. The soil mixed with the solidifying materials is transport outside the machine with the discharge belt conveyor
150
. The soil modifying machine
1
moves between sites by traveling equipment
3
. The oil cutter
147
and the rotary hammer
127
are each called a mixer, and two of them, collectively, are called mixing equipment.
However, the above soil modifying machine
1
has the following disadvantage. The soil cuter
147
and the rotary hammer
127
are driven by a hydraulic motor, and since a change-over valve for feeding pressure oil to the hydraulic motor is an on-off valve, for which a flow rate control cannot be performed, the rotational speed of the hydraulic motor is zero, or a predetermined value set in advance. Consequently, when a kind of earth to be modified is changed, a desired grain diameter of modified soil can hardly be obtained, and thus it is difficult to obtain quality of modified soil corresponding to a purpose of use.
Next, the self-propelled soil modifying machine
1
according to a prior art will be explained with FIG.
9
A and FIG.
9
B. Soil thrown into the raw soil hopper
16
by a loader such as a hydraulic shovel (not shown) is made to be of a predetermined thickness by a raking rotor
49
while being transported on a feed belt conveyor
30
and passed under the solidifying material hopper
2
. When soil is on the feed belt conveyor
30
, a solidifying material feeder
48
is opened and solidifying materials are poured into the soil from the solidifying hopper
2
. The soil and the solidifying materials fall onto a discharge belt conveyor
50
while being cut and mixed with a soil cutter
47
provided in the vicinity of a conveyor outlet of the feed belt conveyor
30
. When falling, a grain diameter of soil covered with the solidifying materials become smaller by an impact of a rotary hammers
27
,
28
and
29
. The soil mixed with the solidifying materials are transported outside the machine by the discharge belt conveyor
50
. A crane
31
is used when the solidifying materials are replenished to the solidifying material hopper
2
. The soil modifying machine
1
moves between sites by the traveling equipment
3
.
The soil cutter
47
and the rotary hammers
27
,
28
and
29
are collectively called a mixer. The feed belt conveyor
30
, the crane
31
, the solidifying material feeder
48
, the raking rotor
49
and the discharge belt conveyor
50
are collectively called a standard working machine. As an optional working machine, included are an air compressor
53
, which is used at a time of cleaning, a secondary and a tertiary belt conveyors
51
and
52
for transporting mixed soil to a place at a predetermined distance from the soil modifying machine
1
, and a vibrating sieve
32
for further selecting finer soil from the mixed soil. The mixer, the standard working machine, the optional working machine, and the traveling equipment
3
are all driven by an engine
4
.
However, the above soil modifying machine
1
has the following disadvantages. An operator selects the working machine to use from the mixer, the standard working machine and the optional working machine, and the operator performs a fine operation to set the working speed of an actuator of the working machine to use, for each soil and operation content. At this time, the operator performs an operation with the engine
4
always set at full throttle because it is troublesome to frequently adjust engine throttle according to the kind of the working machine to be operated and working speed. However, even when a small number of working machines are operated, and the required power is as small as in the case in which an operating speed is low, an engine speed is large, and thus causing the disadvantage of noise and vibration being large. In addition, there arises the disadvantage of fuel economy being poor.
SUMMARY OF THE INVENTION
The present invention is made in view of the above-described disadvantages, and its first object is to provide a rotational speed controller for mixing equipment of a soil modifying machine, by which optional quality of modified soil can be obtained. A second object of the present invention is to provide an engine speed controller for a soil modifying machine, which reduces noise and vibration of the engine and has excellent fuel economy.
In order to attain the above-described objects, the rotational speed controller for the mixing equipment of the soil modifying machine according to the present invention is a rotational speed controller for mixing equipment of a soil modifying machine for mixing and modifying soil to be modified, and has a constitution including
a mixer rotating to mix soil to be modified,
drive means for rotationally driving the mixer, speed control means for controlling rotational speed of the drive means based on an inputted rotational speed command value,
working mode setting means for outputting an working mode signal for setting a kind of soil to be modified, and
a controller for outputting the rotational speed command value corresponding to the working mode signal to the speed control means.
According to the above constitution, the kind of soil to be modified can be set by the working mode setting means, and therefore modified soil modified by the soil modifying machine always has a predetermined grain diameter. When only a degree of loosening soil to be modified is desired as quality of modified soil, the mixer is set at a lower rotational speed, and when modified soil with a fine grain diameter is desired, it is set at a higher rotational speed. Since the grain diameter of modified soil can be optionally set in this manner irrespective of the kind of soil to be modified, the rotational speed controller, by which quality corresponding to a use purpose can be selected, can be provided. Since the rotational speed of the mixer can be controlled according to the kind of soil to be modified and always driven at a necessary and sufficient rotational speed, abrasion speed of the mixer can be reduced and replacement cycle of the mixer becomes longer, thus operation cost can be reduced. Further, quality of modified soil can be set only by operating the working mode setting means, and therefor the soil modifying machine the operation of which is simplified and which has excellent operation feeling can be provided.
Further, in the rotational speed controller may have the constitution in which
a plurality of the mixers are included, and
the controller controls rotational speeds of a plurality of the mixers according to the rotational speed command values corresponding to the individual working mode signals of a plurality of the mixers.
According to the above constitution, a plurality of the mixers are included and
Fujino Taneaki
Ikegami Katsuhiro
Kamoshida Yasuhiro
Yoshida Yasuhiro
Drodge Joseph
Komatsu Ltd.
Rader & Fishman & Grauer, PLLC
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