JPH029126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire rope press-fit type pile driver, and in particular to a wire rope press-fit rope pile driver, in which the winch for the press-fit rope is easy to operate and the press-fit rope can be suitably paid out when hoisting an earth auger. Regarding press-in type pile driver.

Figure 1 shows a wire rope press-fit type pile driver.

The wire rope press-fit pile driver shown in this figure is
Pile driver main body 1, leader support stand 2, leader 3, backstay 4 of the leader 3, top sheave 5, earth auger 6 attached to the leader 3, hoisting rope 7 of the earth auger 6, press-fit rope 1 of the pile 14
0, the pile driver body 1 is equipped with a winch 11 for hoisting the earth auger and a winch 12 for the press-fit lawn. The hoisting rope 7 of the earth auger 6 is let out from the winch 11 and is passed around the top sheave 5 and a sheave provided on the earth auger 6. Meanwhile, the press-fit rope 10 is let out from the winch 12. It is also wrapped around a sheave 9 provided on the leader support stand 2 and a sheave 8 provided on the earth auger 6.

In the wire rope press-fit type pile driver, in order to press-fit the pile 14, excavation is performed around the tip of the pile 14, and the press-fit rope 10 of the pile 14 is wound up with the winch 12, and the pile 14 is It is now being buried. After burying the pile, the earth auger 6 is hoisted up by a winch 11 for the next pile driving operation. At this time, the press-fit rope 10 is let out from the winch 12 following the hoisting of the earth auger 6.

Next, Fig. 2 shows the earth auger 6, the winch 11 for hoisting it, and the winch 1 for press-fitting the rope.
2 and the conventional operating circuit of the winch 12 for the press-fit rope.

The operation circuit of the press-fit rope winch 12 shown in this figure includes an operation lever 15, a first valve 1, a second valve 1
7, 18, a hydraulic source 19 for pilot pressure, a relief valve, and a first and second pilot pressure passage 21, 2 connected to the pilot valve 16.
2, a main hydraulic pressure switching valve 23, a main hydraulic pressure source 24, a relief valve 25, and the main hydraulic switching valve 23 connected via 2.
A hydraulic motor 28 is connected to the hydraulic motor 28 through first and second hydraulic passages 26 and 27, a counterbalance valve 29 including a check valve 30 and a relief valve 31 is connected to the hydraulic power source 19 through a hydraulic passage 32. The brake cylinder 33, the brake 34 of the winch 12, the hydraulic passage 32 for the brake cylinder, and the first and second pilot pressure passages 21 and 22 are provided with third and fourth pilot pressure passages 3.
5 and 36, and a hydraulic switching valve 37 connected thereto.

In the operation circuit of the press-fit rope winch 12, when the operation lever 15 is operated to the a side, the main hydraulic pressure is Pilot pressure is supplied to the pilot chamber C of the switching valve 23, and the main hydraulic switching valve 23 is switched to the position. As a result, the pressure oil discharged from the main oil pressure source 24 is transferred to the main oil pressure switching valve 23 and the first oil pressure passage 26.
and enters the E port side of the hydraulic motor 28. In this case, the pilot pressure is branched from the first pilot pressure passage 21 to the third pilot pressure passage 35, the hydraulic pressure switching valve 37 is switched to the position by the pilot pressure, and the pressure oil discharged from the hydraulic source 19 is enters the brake cylinder 33 through the hydraulic passage 32 and the hydraulic switching valve 37, and the brake cylinder 33 releases the brake 34. Therefore, the hydraulic motor 28 rotates in the direction of arrow A, and the winch 12 for press-fitting rope
0 in the direction shown by arrow C.

On the other hand, if you operate the operating lever 15 to the b side,
Pilot pressure is supplied from port B on the second valve 18 side of the pilot valve 16 to the pilot chamber D of the main hydraulic switching valve 23 through the second pilot pressure passage 22, and the main hydraulic switching valve 23 is controlled by the pilot pressure. & position can be switched. As a result, the main hydraulic power source 2
4 flows into the F port side of the hydraulic motor 28 through the main hydraulic switching valve 23 and the second hydraulic passage 27. In this case, from the second pilot pressure passage 22 to the fourth pilot pressure passage 36
The pilot pressure is branched, thereby switching the hydraulic switching valve 37 to the position, and the pressure oil discharged from the hydraulic source 19 is transferred to the hydraulic passage 32 and the hydraulic switching valve 37.
It flows to the brake cylinder 33 via the brake cylinder 33, and the brake 34 is released by the brake cylinder 33.
Therefore, the hydraulic motor 28 rotates in the direction of arrow B, and the press-fit rope winch 12 operates in the direction of winding the press-fit rope 10 as shown by arrow D.

Next, Figure 3 shows the winch 12 for press-fitting rope.
Another example of the conventional operation circuit of FIG.

The operating circuit shown in this figure differs from the operating circuit shown in FIG. 2 in the following points.

That is, a clutch 38 is provided that transmits the rotational force of the hydraulic motor 28 to the winch 12, and the brake 34 is connected to a brake pedal 40 via a link 39.
is connected to.

Therefore, in the operating circuit shown in FIG. 3, in addition to operating the winch 12 using the operating lever 15 described above, freefall is possible by disengaging the clutch 38 and releasing the brake 34.
Braking is possible by stepping on the brake pedal 40 in the direction of arrow H.

By the way, in the wire rope press-fit type pile driver, when winding up the earth auger 6, it is necessary to pay out the press-fit rope 10 in accordance with the speed. Therefore, in the operating circuit shown in FIG. 2, the press-fit rope 10 is let out by operating the operating lever 15, and in the operating circuit shown in FIG. By winding up the auger 6, the press-fit rope 10 is let out.

Therefore, the conventional operation circuits shown in FIGS. 2 and 3 have the disadvantage that the operation is cumbersome because the press-fit rope 10 must be paid out each time the earth auger 6 is hoisted or stopped. In addition, it is difficult to match the winding speed of the earth auger 6 and the speed at which the press-fit rope 10 is fed out, and if the brake 34 is applied at the wrong timing, the press-fit rope 10 may become slack.
On the other hand, it has the disadvantage of being pulled.

An object of the present invention is to provide a wire rope press-fit type pile driver that eliminates the drawbacks of the prior art, allows easy operation of the winch for the press-fit rope, and allows the press-fit rope to be fed out with appropriate tension when hoisting the earth auger. We are here to provide you with a machine.

A feature of the present invention is that a two-position pilot pressure switching valve that can short-circuit between the entrance and exit of the hydraulic motor is installed in the first and second hydraulic passages that connect the main hydraulic switching valve and the hydraulic motor in the operation circuit of a winch for press-fitting ropes. , and the two-position pilot pressure switching valve is connected to the pilot valve of the operating circuit and the main hydraulic pressure switching valve.
Of the second pilot pressure passage, it is connected to the first pilot pressure passage, which is the pilot pressure passage on the side where the main hydraulic switching valve is switched to the press-fitting rope payout direction, via a branch pilot passage, and is connected to the branch pilot passage. , a two-position switching valve capable of supplying and blocking pilot pressure to the two-position pilot pressure switching valve is provided in the first pilot pressure passage, and the main hydraulic switching valve and the brake of the press-fit rope winch are actuated. An electric circuit including a two-position electromagnetic switching valve capable of supplying and cutting off pilot pressure to a hydraulic switching valve of a brake cylinder, and a switch that links the two-position electromagnetic switching valve to an operating lever of a winch for hoisting an earth auger. With this configuration, the above objective could be reliably achieved.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 4 shows an embodiment of the present invention, in which a first and second hydraulic circuit 26, which connects a main hydraulic switching valve 23 of a press-fit rope operation circuit and a hydraulic motor 28,
2-position pilot pressure switching valve 4 provided between 27
1. A branched pilot pressure passage branched from the pilot pressure passage 21 of the first and second pilot pressure passages 21 and 22 connecting the pilot valve 16 and the main hydraulic pressure switching valve 23 to the two-position pilot pressure switching valve 41. 42, a two-position switching valve 43 provided in the middle of the first pilot pressure passage 21;
Position electromagnetic switching valve 44, electric circuit 4 that operates it
5.

The two-position pilot pressure switching valve 41 is connected via a branch pilot pressure passage 42 to the first pilot pressure passage 21 that switches the main hydraulic pressure switching valve 23 in the press-fitting rope payout direction, and is switched from the neutral position shown in the figure to the position. Accordingly, it is possible to short-circuit between the entrance and exit of the hydraulic motor 28.

A manual switching valve is used as the 2-position switching valve 43, and by switching it from the position shown in the figure, pilot pressure is applied to the pilot chamber G of the 2-position pilot pressure switching valve 41 through the branch pilot pressure passage 42. When the pilot pressure is supplied and switched to the illustrated position, the pilot pressure can be cut off.

The two-position electromagnetic switching valve 44 supplies pilot pressure to the main hydraulic switching valve 23 and the hydraulic switching valve 37 when it is switched to the illustrated position, and supplies the pilot pressure to the main hydraulic switching valve 23 and the hydraulic switching valve 37 when it is switched from the illustrated position to the illustrated position. It has become possible to block out

The electric circuit 45 connects the first and second switches 4
6 and 47, and the second switch 47 is configured to be turned off when the operating lever 48 of the winch 11 for hoisting the earth auger is operated in the hoisting direction.
When the first switch 46 is turned on from the illustrated state, the two-position electromagnetic switching valve 44 is switched to the illustrated position, and the operating lever 48 of the earth auger hoisting winch 11 is operated in the hoisting direction. In particular, when the second switch 47 is turned off, it is configured to switch from the position to the illustrated position.

In the embodiment shown in FIG. 4, other configurations are the same as those of the operating circuit shown in FIG. 2, and the same members are designated by the same reference numerals and further explanation will be omitted.

The operation circuit of the embodiment shown in FIG. 4 operates as follows.

That is, when the two-position switching valve 43 and the two-position electromagnetic switching valve 44 are respectively switched to the illustrated positions, the operating lever 15 cannot be operated to the a side or the b side in the same way as in the operating circuit shown in FIG. Press fit rope 10 from winch 12
is unrolled or wound up.

Next, when the two-position switching valve 43 is switched from position to position and the two-position electromagnetic switching valve 44 is set to the position, when the operating lever 15 is operated to the a side, the A port of the first valve 17 of the pilot valve 16 is opened. ->First pilot pressure passage 21°C Pilot pressure is supplied to the pilot chamber C of the main hydraulic switching valve, and the main hydraulic switching valve 23 is switched from the neutral position to the position. At the same time, the pilot pressure is branched from the third pilot pressure passage 35 to the hydraulic switching valve 37, and the hydraulic switching valve 37 is switched from the neutral position to the hydraulic switching valve. 37 → Brake cylinder 33
Pressure oil is supplied to the brake 34, and the brake 34 is released.
Further, the hydraulic pressure source 19→pilot pressure passage 42
→ 2-position switching valve 43 → Pilot pressure is supplied to the pilot chamber G of the 2-position pilot pressure switching valve 41, and the 2-position pilot pressure switching valve 41 is switched from the neutral position shown in the figure to the position, thereby controlling the hydraulic motor 28. A short circuit is created between the entrance and exit.

As a result, there is only passage resistance in the hydraulic passage around the hydraulic motor 28, so when the earth auger 6 is hoisted up by winding up the hoisting rope 7 with the earth auger hoisting winch 11, the earth auger 6 follows this. The press-fit rope 10 is pulled, and the press-fit rope winch 12 and hydraulic motor 28 rotate in the direction of arrow A. Therefore, the operating lever 15 of the winch 12 for the press-fit rope is
If the press-fit rope 10 is moved in the direction a, which is the direction in which the ground The hoisting speed of the auger 6 and the payout speed of the press-fit rope 10 can be synchronized, and the press-fit rope 10 can be fed out with an appropriate tension so as not to slack or be pulled with excessive tension. .

In addition, as described above, when the operating lever 15 is operated to the b side with the two-position switching valve 43 set to the position and the two-position electromagnetic switching valve 44 set to the position, the winch 12 for the press-fit rope will move along the normal path. It is rotated in the direction of arrow B, and the press-fit rope 10 is wound up.

Next, the electric circuit 45 for the two-position electromagnetic switching valve is as follows:
With the first switch 46 turned on and the operating lever 15 of the winch 12 for press-fitting rope set to side a,
When the operating lever 48 of the earth auger hoisting winch 11 is operated to the d side, which is the hoisting side, the 2-position electromagnetic switching valve 44 is switched from position to position, and the brake 33 of the press-fit rope winch 12 is switched from position to position.
is released, and when the operating lever 48 is returned to the neutral position e side, the second switch 47 is turned on, and the second switch 47 is turned on.
The position electromagnetic switching valve 44 is switched from position to position, and the brake 33 is applied.

Therefore, the first switch 4 of the electrical circuit 45
6, the brake 3 of the press-fit rope winch 12 can be activated simply by operating the control lever 48 of the earth auger hoisting winch 11 while operating the control lever 15 of the press-fit rope winch 12 to side a. Since the earth auger can be hooked and removed, there is no need to operate the operation lever 15 when the earth auger is stopped midway through hoisting or when it is hoisted again.

In the illustrated embodiment, a manual switching valve is used as the two-position switching valve 43 for switching the two-position pilot pressure switching valve 41, but the present invention is not limited to this.

According to the present invention described above, there are two positions between the first and second hydraulic passages connecting the main hydraulic switching valve and the hydraulic motor in the operation circuit of the winch for press-fitting ropes, where the inlet and outlet of the hydraulic motor can be short-circuited. A pilot pressure switching valve is provided, and the 2-position pilot pressure switching valve is switched by another 2-position switching valve, so when hoisting the earth auger, the 2-position pilot pressure switching valve is switched between hydraulic pressure and The main hydraulic switching valve is switched by switching the motor to a position that short-circuits the entrance and exit of the motor, and operating the operating lever of the press-fit rope winch to the press-fit rope payout side, and the hydraulic switching valve and brake cylinder are switched. When the brake is released, a short circuit is created between the entrance and exit of the hydraulic motor.
The winch for the press-fit rope and the hydraulic motor can now be rotated by the rotational force acting on the winch, and when the earth auger is hoisted, the press-fit rope is paid out in accordance with the speed, so the winch for the press-fit rope can be rotated. There is no need to operate the operating lever frequently, and therefore the operation can be easily performed.

Further, according to the present invention, when the press-fit rope is paid out during hoisting of the earth auger, an appropriate tension is applied to the press-fit rope due to the passage resistance of the first and second hydraulic passages, so that the press-fit rope does not become slack. This also has the effect of eliminating problems caused by the application of excessive tensile force.

Further, according to the present invention, the main hydraulic switching valve of the first and second pilot pressure passages connecting the pilot valve and the main hydraulic switching valve in the operation circuit of the press-fit rope winch is switched to the press-fit rope payout direction. A two-position solenoid valve capable of supplying and shutting off pilot pressure to the main hydraulic switching valve and the hydraulic switching valve of the brake cylinder that operates the brake of the winch is provided in the first pilot pressure passage, which is the side pilot pressure passage. is connected to an electric circuit having a switch that is linked to the operating lever of the winch for hoisting the earth auger, and the operation of the hoisting side of the operating lever of the winch for hoisting the earth auger is linked to the release of the brake of the press-fit rope winch. This also has the effect of making it easier to operate the operating lever and brake when starting and stopping the earth auger hoisting.

[Brief explanation of drawings]

Figure 1 is a side view of a wire rope press-fit pile driver, and Figures 2 and 3 are the ground auger, its hoisting winch, the press-fit rope winch, and the conventional winch operation circuit. FIG. 4 is a diagram showing a winch operating circuit as a main part of the present invention. 6...Earth auger, 7...Earth auger hoisting rope, 10...Pile press-fitting rope, 11...Winch for earth auger hoisting, 12...Winch for press-fitting rope, 15...Press-fitting rope Winch operating lever, 16... Pilot valve of the winch's operating circuit, 19... Hydraulic pressure source for pilot pressure, 21, 22... First and second pilot pressure passages connecting the pilot valve and the main hydraulic pressure switching valve. , 23...
...Main hydraulic pressure switching valve, 24...Main hydraulic pressure source, 26, 27
...First and second hydraulic passages connecting the main hydraulic switching valve and the hydraulic motor, 28...Hydraulic motor, 29...Counter balance valve, 32...Hydraulic passage connecting the hydraulic source for pilot pressure and the brake cylinder. , 33
... Brake cylinder, 34 ... Winch brake for press-fitting rope, 35, 36 ... First, second
Third and fourth pilot pressure passages connecting the pilot pressure passage and the hydraulic switching valve, 37... Hydraulic switching valve, 4
1...2-position pilot pressure switching valve that short-circuits between the inlet and outlet of the hydraulic motor, 42...branched pilot pressure passage branched from the first pilot pressure passage to the 2-position pilot pressure switching valve, 43...2-position pilot pressure 2-position switching valve that switches the switching valve, 44...
...2-position electromagnetic switching valve provided in the first pilot pressure passage, 45... an electric circuit for switching the 2-position electromagnetic switching valve, 46, 47... the first in the electric circuit,
Second switch, 48... Winch operating lever for hoisting the earth auger.

Claims (1)

[Claims] 1. A two-position pilot pressure switching valve that can short-circuit between the inlet and outlet of the hydraulic motor is provided in the first and second hydraulic passages connecting the main hydraulic switching valve and the hydraulic motor in the operation circuit of the winch for press-fitting ropes, and The position pilot pressure switching valve is connected to the pilot pressure passage on the side of the first and second pilot pressure passages connecting the pilot valve of the operating circuit and the main hydraulic switching valve, which switches the main hydraulic switching valve to the press-fitting rope payout direction. A two-position switching valve is connected to the first pilot pressure passage via a branch pilot passage, and the branch pilot pressure passage is provided with a two-position switching valve capable of supplying and shutting off pilot pressure to the two-position pilot pressure switching valve, The first pilot pressure passage is provided with a two-position electromagnetic switching valve capable of supplying and shutting off pilot pressure to the main hydraulic switching valve and the hydraulic switching valve of the brake cylinder that operates the brake of the winch for the press-fit rope; A wire rope press-fit pile driver, characterized in that a position solenoid switching valve is connected to an electric circuit having a switch that is linked to an operating lever of a winch for hoisting an earth auger.