JPS6136581Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leader rotation locking device for a pile driving machine equipped with a rotary leader.

Rotary leaders are generally used to selectively use pile hammers and earth augers, which are equipped with different phases, according to the work procedure, and a locking device for locking the leader at a desired rotational position is installed between the leader and the leader base that supports the leader. This rotation locking device is of the pin lock type, that is, in the leader base and the flange of the leader, for example, one lock pin hole is provided on the leader base side, and two lock pin holes for the pile hammer position and the earth auger position are provided on the leader side.
In addition, three lock pin holes for intermediate positions for leader assembly and erection are provided at 45° intervals in the circumferential direction, and when these upper and lower lock pin holes are aligned,
A commonly used method is to lock the leader by moving the lock pin on the leader base side by a stroke using a pin operating mechanism and fitting it across the matching pin holes. In this lock pin method, if the lock pin is not securely fitted into the upper and lower pin holes, the leader will rotate due to the drilling torque or impact force, etc., which may damage the leader rotation mechanism, bend the leader, or even cause it to fall over.

For this reason, conventionally, as a means of displaying and confirming the completion of locking to the driver, a pin called a marker is provided in the pin hole of the leader side flange portion so as to be movable up and down, and when the locking pin is raised (locked), the locking pin is This marker is pushed up so that it protrudes from the leader side flange. However, with this marker method, due to the positional relationship between the marker and the driver, it is difficult for the driver to see the marker, and the marker is often buried in dirt that falls from the screw when working with the auger.
The drawback was that it no longer functioned as a display.

SUMMARY OF THE INVENTION The present invention aims to provide a rotary locking device for a leader in a pile driving machine that can clearly and reliably display and confirm the completion of locking to the operator.

The feature of the present invention is that the stroke position of the lock pin is detected by a pin position detection means such as a proximity switch, and when the lock pin moves to the locking completion position, a lamp etc. is activated based on the detection signal from the detection means. The present invention is characterized in that the electric display means is operated inside the driver's cab to indicate the completion of locking.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the entire pile driver equipped with a rotary leader. In the figure, 1 is the base machine, 2
is a leader established at the front of the base machine 1,
3 is a stay that supports the upper part of the leader, 4 is a leader support that supports the lower part of the leader, P is a pile hammer, and E
is Earth Ogre. The leader 2 is rotatably connected to the leader base 5 attached to the tip of the reader support 4 via a rotary bearing mechanism (not shown) around the leader axis, and has an upper portion attached to the upper end of the stay. It is rotatably supported by a holder 6. In this way, the leader 2 is configured to be able to rotate around its axis within a predetermined angle range (usually 90 degrees), and the leader 1 is rotated to lock it in three positions: the pile hammer position, the earth auger position, and the intermediate position. A locking device is incorporated into the connection between the reader 2 and the reader base 5.

That is, from FIG. 2 onwards, 7 is the leader 2.
A flange portion 8 is provided at the lower end of the leader base 5, and 8 is a flange portion provided at the upper end of the leader base 5 (hereinafter referred to as
These are referred to as an upper flange portion and a lower flange portion), and spacers 9 and 10 are integrally fixed to opposing surfaces of both flange portions 7 and 8 by welding or the like, respectively. Numerals 11, 12, and 13 are three leader-side lock pin holes (hereinafter referred to as upper pin holes), and 14 is one leader base-side lock pin hole (hereinafter referred to as lower pin hole); these upper and lower pin holes 11 13 and 14 are provided extending over and through the flange portions 7 and 8 and the spacers 9 and 10 fixed thereto, respectively. The upper pin holes 11 to 13 are arranged in the circumferential direction 45 as shown in FIG.
For example, the first pin hole 11 is located at the upper side in FIG. 3 at the pile hammer position, the second pin hole 12 is located in the middle at the intermediate position, and the third pin hole is located at the lower side at the auger position. The pin holes 13 are aligned with the lower pin holes 14, respectively. 15... is a lid for preventing earth and sand from flowing into each of the upper pin holes 11, 12, 13, and 16... is a marker similar to the conventional one provided in each of the pin holes 11, 12, 13 so as to be movable up and down. It is.

Reference numeral 17 denotes a locking pin, and in the unlocked state, the pin 17 fits only into the lower pin hole 14 as shown in FIG. By fitting into any one of 11, 12, and 13, a locking function is exerted. Note that FIGS. 4 and 5 show a state in which the upper second pin hole 12 is aligned with the lower pin hole 14. Reference numeral 18 denotes a pin operating mechanism provided below the lock pin 17, which is composed of a hydraulic cylinder 19 and a coil spring 20. This pin operating mechanism 18 allows the lock pin 17 to move between the locking completion position and the release position. Moving.

Reference numeral 21 designates a proximity switch as a pin position detection means for detecting the stroke position of the lock pin 17, which is attached at the joint between the lower flange portion 8 and the spacer 10 with the detection surface 21a facing closely to the circumferential surface of the lock pin 17. There is. As is well known, the proximity switch 21 operates by electronically detecting an object without contact or torque, and here the switch is operated by detecting a change in the gap between the detection surface 21a and the circumferential surface of the lock pin. As shown in FIG. 6, this switch (detection) signal is transmitted to a lock completion lamp 22 and a buzzer 23 as display means installed in the operator's cab 1a of the base machine 1.
The signal is input to the drive circuit 24 as an on signal. A circumferential groove 17a is provided at the lower end of the lock pin 17 in order to change the gap with the detection surface 21a of the proximity switch 21. When the lock pin 17 strokes to the locking completion position, this circumferential groove 17a causes the switch to be detected. Facing the surface 21a. As a result, the gap between the detection surface 21a and the circumferential surface of the lock pin changes (increases), and the proximity switch 21 operates.

When using this device, the stroke movement of the lock pin 17 to the lock completion position is detected by the proximity switch 21 as described above, and the lamp 22 and buzzer 23 in the driver's cab 1a are activated based on this detection signal. Since the system is configured to display the completion of the lock to the driver, the display effect is high and the driver can always reliably and clearly confirm the completion of the lock.

In addition, in the above embodiment, the conventionally used marker 16 was used as is, but
Since a sufficient display effect can be obtained as described above regardless of the marker 16, there is no problem even if the marker 16 is omitted. This marker 16
If this is omitted, the marker lead-out hole 15a of the lid 15 that closes the upper surface opening of the upper pin holes 11 to 13 is not required, so that dirt, etc., may not enter the upper pin holes 11 to 13, which may obstruct the stroke movement of the lock pin 17. It is possible to reliably prevent the intrusion of Further, in the above embodiment, only the completion of locking is detected and displayed by the proximity switch 21, but for example, another proximity switch is provided on the upper flange portion 7 side, and this proximity switch is used to It is also possible to detect the removal of the pin from the hole, that is, the release of the lock, and to operate the unlock indicator lamp and the same buzzer. Furthermore, the pin position detection means is not limited to the above-mentioned proximity switch, and various detection elements, whether contact type or non-contact type, such as a micro switch, limiter switch, or photoelectric switch, can be employed. On the other hand, only one of a lamp and a buzzer may be used as the electrical display means.

As described above, according to the present invention, it is possible to always reliably and clearly display to the driver the operating status of the locking pin, or at least the completion of locking, which is excellent in preventing various troubles caused by malfunctioning locking. It is effective.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of the entire pile driver, Fig. 2 is an enlarged view of the rotary locking device part of the leader, Fig. 3 is a plan view of the same, and Fig. 4 is a side view of the entire pile driver. Figure - Enlarged sectional view in the unlocked state along the line;
FIG. 5 is a diagram corresponding to FIG. 4 in the locked state, and FIG. 6 is an electrical block diagram showing the operating system of the pin position detection means and display means. 1...Base machine, 1a...Driver's cab, 2...
Leader, 5...Leader base, 7, 8...Flange portion, 11-13...Leader side lock pin hole, 1
4... Lock pin hole on the reader base side, 17... Lock pin, 18... Pin operating mechanism, 21... Proximity switch as pin position detection means, 22... Lamp as electrical display means, 23... Same buzzer.

Claims (1)

[Scope of utility model registration request] Lock pin holes are provided in the flanges of both the leader base and the leader rotatably connected to the leader base, and a lock pin that is stroked by a pin operating mechanism is fitted across both lock pin holes to hold the leader in a predetermined position. A leader rotation locking device for a pile driving machine configured to lock at a rotational position of the pile driver includes a pin position detection means for detecting a stroke position of the lock pin, and a pin position detection means for detecting the stroke position of the lock pin at least when the lock pin has moved to a locking completion position. 1. A rotary locking device for a leader in a pile driving machine, comprising electric display means such as a lamp that is operated in the operator's cab based on a detection signal from the means to indicate completion of locking.