JPS6340518Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention involves digging up the ground that has been sprinkled with a soil solidifying agent such as lime or cement to compact the soft ground, and then excavating the soil and soil solidifying agent. This relates to a soil mixer that mixes and stirs soil.

[Technical background of the invention and its problems]

Ground improvement work is common in soft areas, but the depth of improvement is limited to 50 to 60 cm from the ground surface using conventional soil mixers. because,
In order to deepen the improvement depth, it is essential to increase the size of the soil mixer, and in this case, a very large excavation resistance acts on the soil mixing rotor of the soil mixer, so This is because a power unit with high horsepower that can overcome the excavation resistance becomes necessary, but there is no single power unit that can satisfy this condition. In that case, it is conceivable to use multiple sets of large power units, but this involves problems when driving one rotor shaft with multiple sets of power units, and the need to place the above large power units in the vehicle body. However, in the past, it was not possible to use multiple sets of large power units in a soil mixer. However, recently, the advantages of soil improvement methods using this type of soil mixer have been recognized, and with the spread of this method, improvement depths of 100 to 120 cm have been increasing.
is becoming required.

[Purpose of invention]

The present invention aims to dramatically improve the depth of improvement by making it possible to use multiple sets of large power units in a soil mixer.

[Summary of the idea]

The soil mixer of the present invention includes a vehicle body, a rotor support frame provided at one end of the vehicle body so as to be movable at least up and down, and a soil mixer rotatably supported by a rotor shaft inside the rotor support frame. a plurality of hydraulic main motors installed on the rotor support frame to drive the rotor shaft, a plurality of main engines installed on the other end of the vehicle body, and a plurality of main engines connected to each of the main engines. It is characterized by comprising a hydraulic main pump, a plurality of oil feed pipes that communicate and connect the plurality of hydraulic main pumps and the plurality of hydraulic main motors, and a pressure equalization pipe that communicates and connects the plurality of oil feed pipes with each other. The configuration is as follows.

[Example of idea]

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a pair of arms 4 attach a base frame 5 to the right end of a vehicle body 3, which is equipped with a wetland track 1 and has a driver's cab 2 located approximately in the center. is supported so as to be vertically movable, and this base frame 5 is made vertically movable by a pair of lift cylinders 6. Further, a pair of tilt cylinders 7 are provided between the upper part of the base frame 5 and the pair of arms 4.
By simultaneously expanding and contracting the pair of tilt cylinders 7, the base frame 5 can be rotated in the front and rear directions, and by expanding and contracting on one side, the base frame 5 can be tilted to one side. A rotor support frame 8 is fitted to the base frame 5 so as to be slidable in the lateral direction, and this is supported by a slide cylinder (not shown in FIGS. 1 and 2) provided inside the base frame 5. The rotor support frame 8 is made to be able to slide laterally. Also, this rotor support frame 8
A soil mixing rotor 10 is installed inside the rotor shaft 9.
Supports rotatably. The rotor 10 includes a plurality of sets of eight rotating blades 11 along the rotor shaft 9, and the rotating blades 11 excavate the ground and mix and stir the soil and soil solidification agent.

Further, the main bodies of the two hydraulic main motors 14 and 15 are fixed to the upper part of the rotor support frame 8, and the rotation shafts of each of the motors 14 and 15 are made into one rotation shaft 16, and the rotation of this rotation shaft 16 is controlled. The transmission is transmitted to the common intermediate shaft 18 by a pair of chain transmission mechanisms 17, and further transmitted to the rotor shaft 9 by a pair of chain transmission mechanisms (not shown) provided within both sides of the rotor support frame 8. do. Further, a pedestal 21 is attached to the left end of the vehicle main body 3, and two
The main engines 22 and 23 are installed, and each of the main engines 2
Two hydraulic main pumps 24 and 25 are connected to 2 and 23, respectively.

Further, as shown in FIG. 3, each of the main pumps 2
4, 25 and the respective main motors 14, 15 are connected to each other through two oil feed pipes 26, 27, respectively,
These two oil supply pipes 26 and 27 are connected to each other through a pressure equalization pipe 28. In addition, each of the above main engines 22,
Two hydraulic pumps 29 and 30 are connected to 23 separately from the main pumps 24 and 25, and one pump 29 supplies hydraulic pressure to the hydraulic motor 31 that drives the endless track 1, and the other pump A pump 30 supplies hydraulic pressure to the lift cylinder 6, tilt cylinder 7, and slide cylinder 35 via switching valves 32, 33, and 34. The rotation of the main engines 22 and 23 is controlled by the main pump 2 through gears.
4, 25 and pumps 29, 30 separately. If the main motors 14 and 15 and the running motor 3
1 is driven by the same pump, the magnitude of the load applied to the main motors 14 and 15 depends on the driving motor 3.
However, if a separate pump is used as described above, there is no such risk.

Then, main pumps 24 and 25 driven by main engines 22 and 23 supply oil pressure to main motors 14 and 15, and one rotor shaft 9 is driven by these two main motors 14 and 15. do. For example, one
By using the main engines 22 and 23 of 150P.S.
A large-diameter rotor 10 capable of excavating and mixing and stirring to a depth of 1 m 20 cm from the ground surface can be rotated powerfully by overcoming the excavation resistance that increases as the insertion depth increases. At this time, even if there is a possibility that the rotational speeds of the main motors 14 and 15 may differ due to an imbalance in the discharge flow rates of the main pumps 24 and 25, an imbalance in the line resistance of the oil feed pipes 26 and 27, etc. Since the hydraulic pressures acting on the main motors 14 and 15 are equalized by the pressure equalizing pipe 28, the two main motors 1
4 and 15 are driven at constant speed and do not interfere with each other. Therefore, the two main motors 14 and 15 fully demonstrate their capabilities and output strong rotational torque, so there is no waste. In this way, 120cm from the ground
Ground improvement can be carried out continuously up to depth.

[Effect of idea]

According to the present invention, the rotor for soil mixing is provided at one end of the vehicle body, and the main engine is installed on the other end of the vehicle body. Even if the rotor for soil mixing is made larger, the overall balance of the vehicle body is maintained well, and the multiple oil feed pipes that connect the multiple hydraulic main pumps and hydraulic main motors to pressure equalization pipes can be used as pressure equalization pipes. Since they are interconnected, it is possible to drive multiple hydraulic main motors at a constant speed without interfering with each other to powerfully drive one rotor shaft, and in this way, multiple sets of large-sized By devising a power unit that can be used in a soil mixing machine, the drive horsepower of the soil mixing rotor was significantly increased, and the depth of improvement processing by the rotor was dramatically increased. .

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the soil mixer of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a hydraulic circuit diagram thereof. 3... Vehicle body, 8... Rotor support frame, 9...
Rotor shaft, 10...rotor for soil mixing, 14,1
5...Hydraulic main motor, 22, 23...Main engine, 2
4, 25...Hydraulic main pump, 26, 27...Oil feed pipe, 28...Pressure equalization pipe.

Claims (1)

[Scope of utility model registration request] A vehicle body, a rotor support frame provided at one end of the vehicle body so as to be movable at least vertically, a soil mixing rotor rotatably supported by a rotor shaft inside the rotor support frame, and the rotor support frame. a plurality of hydraulic main motors installed on the vehicle to drive the rotor shaft; a plurality of main engines installed on the other end of the vehicle body; a plurality of hydraulic main pumps connected to each of the main engines; A soil mixer comprising: a plurality of oil feed pipes that communicate and connect a hydraulic main pump and the plurality of hydraulic main motors, and a pressure equalization pipe that communicates and connects the plurality of oil feed pipes to each other.