JPH0344167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic circuit for a winch in a wire rope press-fit pile driver equipped with an earth auger hoist winch and a press-fit rope take-up winch.

FIG. 1 shows an example of a wire rope press-fit type pile driver, in which a leader support stand 2 is attached to the front part of a revolving body 1b which is rotatably installed on a traveling body 1a. 3, and the leader 3 is held vertically by a cylinder constituting a backstay 4 provided between the upper part of the leader 3 and the rear part of the revolving structure 1b. An earth auger 6 is attached to a guide rail 3a vertically attached to the leader 3 so as to be movable up and down, and a rope 8 wound around a hoisting winch 11 installed on the revolving body 1b is attached to the top of the leader 3. The top sheave 5 is attached to the top sheave 5 and the sheave 5' is attached to the frame of the earth auger 6. In addition, the rotating body 1
A take-up winch 12 for winding the press-fit rope 10 is installed on b, and the press-fit rope 10 is hung between the sheave 7 attached to the frame of the earth auger 6 and the sheave 9 attached to the leader support stand 2. It's spinning.

When driving piles using this pile driver, pile 1
4 is engaged with the earth auger 6, and the earth auger screw 13 inserted into the pile 14 is rotated by the earth auger 6 to excavate earth and sand at the lower end of the pile 14, and Excavation is performed while press-fitting the pile 14 by winding up the press-fitting rope 10 with the winding winch 12. Pile 1
4, the earth auger 6 is hoisted up by operating the hoisting winch 11 for the next pile driving operation. At this time, the press-fit rope 10 follows the hoisting of the earth auger 6 and is hoisted up. Take winch 12
Bring out more.

Figures 2 and 3 show a conventional winding winch 1.
2 structure and hydraulic circuit. FIG. 2 shows an example in which an automatic brake mechanism is attached to the take-up winch 12, 23 is a hydraulic motor for rotating the drum of the take-up winch 12, 17 and 20 are hydraulic power sources, 22A, 22
B is a main pipe that supplies and discharges pressure oil from the hydraulic source 20 to the hydraulic motor 23; 19 is the main pipe 2;
2A and 22B are provided with directional switching valves for the oil motor 23; 24 is a counterbalance valve consisting of a main valve 28 and a check valve 21 provided in the main pipes 22A and 22B; 16 is the directional switching valve with an operating lever 15; A pilot valve of the valve 19, 27 is a brake of the take-up winch 12, 26 is a brake cylinder for operating the brake 27, 25 is a pilot valve of the brake cylinder 26, and its pilot pipes 41 and 42 are connected to the direction switching, respectively. It is connected to pilot lines 43 and 44 of valve 19. 18 and 18' are hydraulic power sources 17 and 20, respectively.
It is a relief valve.

In this hydraulic circuit, when the operating lever 15 of the pilot valve 16 is operated to the a side, pressure oil is guided from the A port of the pilot valve 16 to the C port of the directional control valve 19 via the pilot pipe line 43, and the directional control valve 19 in the X direction. Therefore, pressure oil from the hydraulic source 20 is supplied to the hydraulic motor 23 through the main pipe 22B, and at the same time, the pilot valve 25 is switched to the right position, and the brake cylinder 26 is operated by the hydraulic pressure from the hydraulic source 17. Since the brake 27 is released, the hydraulic motor 23 rotates the drum of the take-up winch 12 in the direction in which the press-fit rope 10 is fed out.

On the other hand, when the operating lever 15 is operated in the b direction, the direction switching valve 19 is switched to the Y direction, and the hydraulic motor 23 is rotated in the direction of winding the press-fit rope 10 of the winding winch 12.

In such a winch hydraulic circuit, when hoisting the earth auger 6, it is necessary to pay out the press-fit rope 10 in accordance with the speed of the hoist, and therefore,
It is necessary to frequently move the operating lever 15 each time the earth auger 6 is hoisted or stopped, making it difficult to synchronize the speeds and making the operation complicated. Also,
If you make a mistake in synchronizing the speed, press-fit rope 10
may come loose or be pulled together.

The hydraulic circuit shown in FIG. 3 differs from the hydraulic circuit shown in FIG. 2 in that a clutch 30 is provided and a manually operated brake pedal 29 is provided in place of the brake cylinder 26. In this hydraulic circuit, freefall is possible by disengaging the clutch 30 and releasing the brake 27, and braking is possible by depressing the brake pedal 29.

In the circuit shown in FIG. 3, when hoisting the earth auger 6, the clutch 30 is disengaged and the brake 27
It is necessary to create a free fall state by releasing . Therefore, the winding of the earth auger 6,
It is necessary to operate the brake every time the brake is stopped, which is complicated, and if the timing of applying the brake 27 is incorrect, as described above, the press-fit rope 10
may come loose or be pulled together.

The present invention provides a hydraulic circuit for a winch of a pile driver that eliminates the need for frequent lever operations associated with hoisting an earth auger, and that prevents the press-fit rope from loosening or pulling against each other. The purpose is to provide.

In order to achieve this object, the present invention provides a pile driving machine equipped with an earth auger hoisting winch and a press-fit rope take-up winch, in which an operating circuit for the press-fit rope take-up winch is provided with a connection between the entrance and exit of the hydraulic motor for rotating the drum. a two-position switching valve that short-circuits, a directional switching valve for the hydraulic motor, and a switching valve capable of supplying and shutting off pressure oil during hoisting of a pilot valve for operating an earth auger hoisting winch to a pilot chamber of the two-position switching valve; , at the junction of the pipe line connected to the pilot chamber of the two-position switching valve of the switching valve and the pipe line supplied when lowering the pilot valve for operating the press-fit rope winding winch. It has the function of preventing oil contact between each other,
The secondary pipe line is provided with a valve connected to a pilot chamber to which pressure oil is supplied when lowering the directional control valve, and the winding operation of the earth auger hoisting winch and the rope payout operation of the press-fit rope winding winch are performed. An embodiment of the present invention, which is characterized in that it can be interlocked, will be described below with reference to FIG. In FIG. 4, the same reference numerals as in FIGS. 1 and 2 indicate the same parts. 34 is a pilot valve of a directional valve (not shown) for switching an oil path to a hydraulic motor (not shown) for driving the hoisting winch 11, and when the operating lever 33 is moved to the e side, the pilot valve is opened from the F port side (not shown). The hoisting winch 11 is rotated in the lowering direction by being guided to one pilot chamber of the directional switching valve that does not operate, and when operated to the d side, the hoisting winch 11 is rotated in the hoisting direction by being guided from the G port to the other pilot chamber. It is configured as follows.

39 is a two-position switching valve that short-circuits the entrance and exit of the drum rotation hydraulic motor of the winding winch 12 by supplying pressure oil to the pilot chamber 39a; and 32, pressure oil appears when the winding winch 11 is hoisted by the valve 34. G port and the 2-position switching valve 3
This is a switching valve installed in a conduit 40 that connects the pilot chamber 39a of the pilot chamber 39a, and although a manual type is shown in this embodiment, it can be operated by the operator at will, and can control the G to pilot chamber 39a. Other types of switching valves may be used as long as they are capable of supplying and shutting off pressure oil to the ports.

Reference numeral 31 is provided at the confluence of a pipe line 38 communicating with the pipe line 40 and a pipe line 37 connected to the A port to which pressurized oil is supplied when lowering the pilot valve 16 for operating the press-fit rope winding winch. to prevent oil communication between the secondary pipes 4 and 4.
3' is a shuttle valve connected to the pilot chamber C to which pressure oil is supplied when the directional control valve 19 is lowered.

In FIG. 4, when the switching valve 32 is in the illustrated shutoff position, normal winding and lowering can be performed by operating the operating lever 15, as in the case of FIG. Further, by operating the operating lever 33, the hoisting winch 11 can also be hoisted up and lowered normally.

When the switching valve 32 is switched in the Z direction to the communication position, when the operating lever 33 is operated to the d side (in the case of hoisting the earth auger 6), pressure oil is transferred from the G port to the switching valve 32, the pipe line 38, and the shuttle. valve 31,
It is led to the pilot chamber C of the directional control valve 19 via a pipe 43', and at the same time when the directional control valve 19 is switched to the lowering side, it is introduced to the pilot chamber 39a of the two-position control valve 39 via a pipe 40. In order to switch the two-position switching valve 39 from the blocking position to the communicating position, the two-position switching valve 39 short-circuits the inlets and outlets I and J of the hydraulic motor 23 . In addition, the pipe line 41
Pressure oil is also introduced into the pilot chamber of the pilot valve 25 through the pilot valve 25, and the brake cylinder 26 is operated to release the brake 27. Therefore, hydraulic motor 2
The resistance to the rotation of 3 is only the resistance of the pipe line including the two-position switching valve 39 around the hydraulic motor 23,
When the earth auger 6 is wound up by winding up the rope 8 with the winding winch 11, the winding winch 12 and the hydraulic motor 23 rotate as they are pulled by the press-fitting rope 10. When the operating lever 33 is returned to the neutral position, the directional switching valve 19 returns to the neutral position, the two-position switching valve 39 enters the cutoff state, the brake 27 is applied, and the take-up winch 12 is stopped.

Even if the operating lever 15 of the pilot valve 16 is operated to a position, the pressure oil from the A port is blocked by the shuttle valve 31, so the two-position switching valve 39 is switched to the communicating position by operating the operating lever 15. Never.

As described above, according to the present invention, the winding operation of the winding winch of the earth auger and the rope payout operation of the press-fit rope winding winch can be linked, and the press-fit rope is paid out in accordance with the speed when the earth auger is hoisted. This eliminates the need for frequent lever operations when starting, hoisting, and stopping hoisting using the earth auger, unlike in the case of hydraulic circuits using conventional automatic brake mechanisms. Since the earth auger does not require frequent brake operations when hoisting or stopping, it is extremely easy for the operator to operate the pile driver. In addition, in the circuit of the present invention, when the earth auger is hoisted, appropriate tension is applied to the press-fit rope due to the resistance of the pipe around the hydraulic motor, so the press-fit rope will not loosen and will not be damaged due to an operational error as in the conventional case. There is also no fear that a large tension will be applied to the press-fit rope or the earth auger hoisting rope.

[Brief explanation of drawings]

Figure 1 is an overall view of the wire rope press-in type pile driver.
2 and 3 are hydraulic circuit diagrams of a winch of a conventional pile driving machine, and FIG. 4 is a hydraulic circuit diagram showing an embodiment of the present invention. 6... Earth auger, 8, 10... Rope, 1
1... Hoisting winch, 12... Winding winch, 16... Pilot valve, 19... Directional switching valve, 23... Hydraulic motor, 31... Shuttle valve,
32...Switching valve, 34...Pilot valve for directional switching valve of hoisting winch, 39...2-position switching valve.

Claims (1)

[Claims] 1. In a pile driver equipped with an earth auger hoisting winch and a press-fit rope take-up winch, the operating circuit of the press-fit rope take-up winch includes a two-position switching valve that short-circuits between the entrance and exit of the hydraulic motor for rotating the drum, and the hydraulic A directional switching valve for the motor, a switching valve capable of supplying and shutting off hydraulic pressure during hoisting of a pilot valve for operating an earth auger hoisting winch to the pilot chamber of the two-position switching valve, and the above-mentioned two-position switching valve.
It is installed at the confluence of the pipe that communicates with the pipe that connects to the pilot chamber of the position switching valve and the pipe that is supplied with pressure oil when lowering the pilot valve for operating the press-fit rope winding winch. The secondary pipe has a function of preventing oil communication between A hydraulic circuit for a winch of a pile driver, characterized in that the operation and the rope payout operation of a press-fit rope winding winch can be linked.