JPH0347314A - Rocking device for excavator - Google Patents

Abstract

PURPOSE:To save the cost of operations by a method in which a rocking controller having an oil pump, a solenoid switch valve, an oil motor, an intermediate conductor, and a rotary encoder which are connected is provided, and the output side of the control circuit is connected to the solenoid of the solenoid switch valve. CONSTITUTION:An oil pump 8 to be driven by a motor 1, a solenoid switch valve 9, and an oil motor 10 to be turned forwardly and reversely by the valve 9 are provided. Also, an intermediate conductor 4 in which the output shaft of the motor 10 and the output side of a transmission 3 are connected in a freely switching manner is provided. A rocking controller 18 consisting of rotary encoder 12 attached to the shaft of the conductor 4, a rocking angle counter 14, rocking angle setting and operating switches 16 and 17, and a rocking control circuit 18 connected to the switches 16 and 17, etc., is provided, in which the output side of the controller 18 is connected to the solenoids 9a and 9b of the valve 9. A continuous wall close to a structure can thus be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ground improvement machine mainly used for improving soft ground, and particularly to a rocking device for an excavator.

[Conventional technology] A conventional ground improvement machine has a drilling blade and a solidification agent discharge port at the tip, and several stages of stirring blades above the rotor.For example, it excavates when the rod is lowered, and discharges the solidification agent when the rod rises. Then, a cylindrical improved column 42a as shown in FIG. 5 is formed, or a nozzle is provided near the tip of the rod, and the ground is excavated while the rod is lowered while jetting water from the nozzle.
There is one in which a cylindrical improved column 42a is formed while ejecting a solidifying agent from the nozzle at high speed when the rod rises.

[Problem to be solved by the invention] However, in the conventional ground improvement machine as described above, the fifth
As shown in the figure, a columnar continuous wall 42 is formed.
The injection range was wide, and material was wasted in the case of a continuous wall that did not require much strength.

Further, when it is necessary to construct a continuous wall close to a structure, there is a problem in that a cylindrical continuous wall has uneven gaps between it and the structure.

The present invention has been made in view of the above-mentioned circumstances.

[Means for Solving the Problems] A rocking device for an excavator of the present invention is a spindle-type polling machine in which a spindle shaft is rotated and fed by a motor through a transmission, and includes an oil pump driven by the motor, and the oil pump. an electromagnetic switching valve connected to an oil motor that rotates in forward and reverse directions by the electromagnetic switching valve;
An intermediate transmission section that connects the output shaft of the oil motor and the output side of the transmission in a switchable manner, a rotary encoder attached to a predetermined shaft of the intermediate transmission section, and a swing angle counter connected to the rotary encoder. , comprising a swing control means consisting of a swing angle setting switch, an operation switch, and a swing control circuit connected to these, the output side of the swing control circuit being connected to the solenoid of the electromagnetic switching valve. It is characterized by what it did.

[Function] The intermediate transmission part has a power transmission path that rotates the spindle from the motor via the transmission, and the motor drives the oil pump, and the pressure oil from the oil pump passes through the switching valve to drive the oil motor, which swings the spindle. Switch between the power transmission path and the power transmission path. The rotation is also detected by a row encoder, and the spindle holding the drilling rod is rotated at a set swing angle.

[Example] Fig. 1 is a schematic configuration diagram of an excavator showing an example of the present invention;
Fig. 2 is a diagram showing the circuit of the switch box in Fig. 1, Fig. 3 is a flowchart showing the operation of the swinging device of the present invention, and Fig. 4 is a diagram showing the operation of the swinging device of the present invention in an excavator. FIG.

In Fig. 1, 1 is a motor, 2 is a main clutch, 3 is a transmission, and 4 is an intermediate transmission part. In the case of normal excavation, the power transmitted from the motor 1 passes through the menin clutch 2 and is converted to the necessary torque by the transmission 3. By operating a switching lever (not shown) and shifting the sliding gear 48 in the direction B, the spindle 5 is rotated via the intermediate transmission section 4. A drilling rod (not shown) is inserted through the spindle 5, gripped by a chuck 6, and fed vertically by a hydraulic cylinder (not shown). The structure is the same as a conventional spindle type excavator (poling machine) except for the intermediate conduction part 4.

When solidifying agent is injected by rocking motion, the main clutch 2 is disengaged, and the power from the motor is transmitted to the oil pump 8 via the V-sheaves 7a, 7b and the V-belt 7C. The oil motor 10 is rotated in the forward or reverse direction via the switching valve 9. In FIG. 1, the oil motor 10 is in a stopped state. When an output signal from a swing control circuit 11 (described later) enters the solenoid 9a or 9b, the electromagnetic switching valve 9 slides leftward or rightward, and the oil motor 10 rotates forward or reverse. In this case, the switching lever 4a of the intermediate transmission section 4 is in a state shifted to the A side, and the power of the oil motor IO is transmitted to the spindle 5 via the intermediate transmission section 4, and the drilling rod (not shown) inserted therein is moved to a predetermined position. Rotate forward or reverse at an angle of .

and a bevel pinion shaft 4 of the intermediate conduction section 4;
A rotary encoder 12 is attached to the outer end of b. FIG. 2 shows the circuit of the switch box 20 shown by the chain line in FIG.
b, rocking angle setting switch 1, which is a digital switch.
6 is connected to the CPU 18b via the display digital switch interface 19, and the operation switch 17 is connected to the CPU 18b via the input interface 18a.The input interface 18a, cPU 18b, output interface 18c, and relay 18d form a swing control circuit. 18 (Fig. 1). Swing angle setting switch 1
The output signal from 6 is input to the display/digital switch interface 19, and the swing angle is displayed on a swing angle indicator which is an LED display.

The rotary encoder 12 is a bevel pinion shaft 4b
The output signal of the rotary encoder 12 is input to the swing angle counter 14 as well as the tachometer 1.
3 and the rotation speed is displayed. The signal from the swing angle counter 14 is input to the swing control circuit 18 and also to the swing angle indicator 15, where the swing angle is displayed. The swing control circuit 18 is connected to the output side of the swing angle setting switch 16, and receives this signal and the swing angle counter 1.
4 and sends a control current to a pair of solenoids 9a and 9b of the electromagnetic switching valve 9 that switches between forward, reverse, and stop, resulting in the swing angle set by the swing angle setting switch 16. The control of the swing angle is as shown in the flowchart of FIG. 3.

First, as a preparatory work, in step 0, operate the operation switch 14 to align the swing center with the nozzle position of the excavation shaft, then in step O, press the swing origin set switch, and then in step G, press the shore swing start switch. push.

Then, the swing control circuit 11 reads the value of the swing angle switch 16 in step 8, and sets step e=-the upper limit of the angle.
In the 0th step 6k, where the lower limit is calculated, the control current from the swing control circuit 11 flows to the solenoid 9a of the 3-position electromagnetic valve 9, and the spindle 5 rotates forward. Swing control circuit 1 receiving the signal
8, it is judged whether the upper limit angle is reached or not, and if No, it returns to step 0, and if Yes, it stops forward rotation, then moves to step after 0.2 seconds, and solenoid 9b is activated, causing spindle 5 to reverse. In step ◎, determine whether the lower limit angle is reached or not.
If NO, the process returns to step O, and if YES, reverse rotation is stopped, and after 0.2 seconds, the process proceeds to step O, where it is determined whether or not the swinging has stopped. If the return to step Q is NO, the process returns to step O, starts normal rotation again, goes through steps 0-0-0, and executes step 2X to rotate the spindle 5 in the normal and reverse directions at the set angle.

During this time, the spindle [phase] swings at an angle set by the swing angle setting switch 16, and is fed by a hydraulic cylinder (not shown). Then, in step O, when the swing stop switch is pressed, the swing stops and ends.

By raising or lowering the drilling rod while ejecting the solidification agent from the drilling rod after excavation by using the swinging device described above, the fan-shaped improved column 41a as shown in FIG.
A fan-shaped continuous wall 41 is formed by constructing a continuous wall 41 and wrapping them together and placing them adjacent to each other.

The swinging device of the present invention is applicable not only to spindle type excavators but also to power swivel type excavators.

[Effects of the Invention] According to the present invention described in detail above, it can be used to construct a high-strength continuous wall that does not require it, so material costs and man-hours are saved. In addition, since a continuous wall with few irregularities can be created on the outside, it is possible to create a continuous wall close to the structure, which is advantageous in terms of worship.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an excavator showing an embodiment of the swinging device of the present invention, FIG. 2 is a diagram showing a circuit of the switch box of FIG. 1, and FIG. 3 is a diagram of the swinging device of the present invention. A flowchart showing the operation, Figure 4 is a plan view of a continuous wall constructed using an excavator equipped with the rocking device of the present invention, and Figure 5 is a diagram of a continuous wall constructed using a conventional excavator (ground improvement machine). FIG. l...Motor, 2...Main clutch, 3-h transmission, 4...Intermediate transmission section, 5...Spindle, 8...Oil pump, 9...Solenoid switching valve, 9a, 9b---Solenoid, lO... Oil motor, 18... Rocking control circuit, 1
2... Rotary encoder, 14... Rocking angle counter, 16... Rocking angle setting switch. patent

Claims (1)

[Scope of Claims] A spindle type boring machine in which a spindle shaft is rotated and fed by a motor via a transmission, comprising: an oil pump driven by the motor; an electromagnetic switching valve connected to the oil pump; an oil motor that rotates in forward and reverse directions; an intermediate transmission section in which the output shaft of the oil motor and the output side of the transmission are switchably connected; a rotary encoder mounted on a predetermined shaft of the intermediate transmission section; a swing angle counter connected to a swing angle counter, a swing angle setting switch, an operation switch, and a swing control circuit connected to these, the output side of the swing control circuit is A rocking device for an excavator, characterized in that it is connected to a solenoid of the electromagnetic switching valve.