JP3394222B2 - Drilling lever of pile construction machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile construction machine (earth drill machine). Particularly, it relates to the excavation lever of the pile construction machine.

[0002]

2. Description of the Related Art FIG. 3 shows a typical pile construction machine. For example, in the case of the earth drill as shown in FIG. 3, the upper end of the kelly bar a is suspended and held by the wire rope c hanging from the head of the boom b, and the excavation bucket d is attached to the lower end of the kerry bar a. The rotary table e applies a rotational force to the kelly bar a, and the thruster cylinder f pushes the kerry bar a downward, and the excavation bucket d excavates the excavation.

[Problem 1] Although such a pile construction machine is operated in a cab as shown in FIG. 4, a lever handle is provided with a push button switch-equipped kerry bar rotary lever g and a push button thruster lever h separately. It is provided in. Reference numeral i is a kerry bar winding up / down lever, and j is an undulating lever. With this configuration, (1) it is difficult to simultaneously perform rotation and thruster operation during work.
For this reason, in the earth drill work, in order to improve work efficiency, the three levers of the kerry bar rotation lever g, the thruster lever h and the kerry bar winding up / down lever i are simultaneously operated. It is very difficult to operate. (2) In addition, there is a risk that the lever operation may be mistaken during work, leading to a serious accident. That is, since there are three levers, the levers are moved back and there is a risk of erroneous operation such as moving the kerry bar rotation lever g but moving the adjacent boom hoisting lever j. (3) Also, since it has three levers, it takes time to change the holding.

[Problem 2] Since the thruster operation is an electric push button switch, there are many failures in a place where it is frequently used and there is much sludge and the like, and there is a problem in reliability. If the switch is broken, excavation work cannot be performed at all, which is fatal to the user.

[0005]

In view of the problems of the prior art, it is an object of the present invention to improve the safety by simplifying and facilitating the operability of the lever of a pile construction machine.

[0006]

[Means for Solving the Problems] In a pile construction machine, one lever is provided in the cab for enabling the kerry bar rotation operation and the thruster operation, and the left and right rotations of the kerry bar are performed by the left and right movements of the one lever. The operation was performed so that the kerry bar could be pressed in and pulled out by moving back and forth. In the above configuration, the thruster operation of one lever is converted into hydraulic pressure, this is detected by the pressure switch, this is converted into an electric signal via the switching relay, and the thruster control valve is switched by the electric signal, The driving pressure oil generated by the pump is supplied to the thruster cylinder, and the kerry bar is pressed in,
I tried to pull it out. In the same configuration, the thruster operation amount by one lever is detected by the sensor, the electromagnetic proportional control valve is switched through the constant current amplifier, and the driving pressure oil is supplied to the thruster cylinder. In the same configuration, the pilot oil pressure is directly supplied to the thruster control valve, and the pressure oil is supplied to the thruster cylinder for switching.

[0007]

DETAILED DESCRIPTION OF THE INVENTION A description will be given with reference to FIGS. FIG. 2 is a layout view of the inside of the cab according to the present invention.
A kerry bar winding up / down lever i is provided on the left side of the driver's seat m, and a boom raising / lowering lever j and a kerry bar rotating / thruster lever k are provided on the right side. As shown in FIG. 2, the kelly bar rotating and thruster lever k is composed of one lever that can be moved in the front-rear direction and the left-right direction. The kerry bar a is rotated by operating the left-right direction and by the thruster cylinder f by operating the front-back direction. Press-fitting / pulling-out work can be performed.

(Individual work) By rotating one kerry bar that can be moved in the front-back and left-right directions and operating the thruster lever k,
During independent work, the kelly bar a rotates leftward when the kelly bar a rotates left, and rightly when the kelly bar a rotates right, and the thruster cylinder f operates in a press-fitting direction in a pre-operation and a pull-out direction in a post-operation. (Simultaneous work of rotation and press-fitting) When performing the simultaneous work, for example, when operating the thruster cylinder f while rotating the kerry bar a to the left, the kerry bar rotation and thruster lever k are operated to the left front. On the contrary, while rotating to the right, thruster cylinder f
When activating and press-fitting, the kerry bar rotation and the star star lever k are operated to the front right.

The kelly bar rotation and thruster operation will be described in more detail with reference to FIG. An excavation bucket d is attached to the lower part of the kelly bar a on the right side of the figure. f
Is thruster cylinder and is pressed in and out by hydraulic pressure. Reference numeral n denotes a hydraulic motor for driving the Kelly bar rotation, the rotation of which is transmitted through gear mechanisms o and p.

Moving to the left side of the drawing, 20 is a pilot hydraulic power source pump. Kerry bar a is operated by kerry bar rotation and one star lever k, but kerry bar rotation operation side k
_It also serves as ₁ and the thruster operating side k ₂ . First, the kelly bar rotation will be described with reference to the lower side of FIG. 1. When the kerry bar rotation control valve 21 is operated by rotating the kerry bar rotation right or left to the rotation operation side k ₁ , the pressure signal is sent to the kerry bar rotation control valve 21 and switched from the hydraulic pump 22. The hydraulic pressure is switched to left rotation or right rotation, the kerry bar drive motor n is driven right or left, and the gear mechanism o,
The kelly bar a is rotated via p.

On the other hand, when the thruster operating side k ₂ is operated (see the upper half of FIG. 1) to perform thruster press-fitting or pull-out, these pressure signals are sent to the press-fitting pressure switch 23a or the pulling-out pressure switch 23b. To be When a signal is sent to the press-fitting pressure switch 23a, the relay (X ₁ ) 24
a is excited, and the corresponding relay contact (X ₁ ) 24
b becomes "closed", the thruster control valve 26 is switched,
The pressure oil of the pump 27 is supplied to the thruster cylinder f through the circuit 28.
And the kerry bar a is press-fitted.

When the thruster operating side k ₂ is operated to the pulling side, a pressure signal is sent to the pulling pressure switch 23b,
When the relay (X ₂ ) 25a is excited, the relay contact (X ₂ )
25b becomes "closed", the thruster control valve 26 is switched, pressure oil is sent to the extraction side of the thruster cylinder f, and the kelly bar a is extracted.

In the above description, the press-fitting pressure switch 23 is used.
a or withdrawal pressure switch 23b, switching relays 24a and 24b or 25a and 25b, and thruster control valve 26
Although the control circuit using is described above, as shown in the parentheses in FIG. 1, this is used as a pressure sensor instead of the press-fitting pressure switch 23a or the withdrawal pressure switch 23b, and the electromagnetic proportional control is used instead of the thruster control valve 26. A valve may be used, and a constant current amplifier may be used instead of the switching relays 24a, 24b and 25a, 25b.

The circuit 29 shown by the dotted line in FIG. 1 is for control by a hydraulic pilot. When the kelly bar rotation and thruster lever k are operated to press-fit the thruster operating side k ₂ , the pilot pressure acts on the thruster control valve 26 to switch it, and the pressure oil generated by the pump 27 is supplied to the press-fitting side of the thruster cylinder f. . Conversely, when the thruster operating side k ₂ is operated to the pulling side, similarly, the thruster control valve 26 is switched, and pressure oil is supplied to the pulling side of the thruster cylinder f. Therefore, in this case, no electric system is required.

In the present invention, the kerry bar a is rotated left and right,
When the thruster is press-fitted / pulled-out, the operation direction of the single lever k was set to the front / rear / left / right, but it is of course possible to use the front / rear / left / right interchanged. Alternatively, press fitting, withdrawal,
The left-right rotation position may be set to any position.

[0016]

[Effects of the Invention] 1) Since the rotation and thruster operation of the kelly bar can be performed simultaneously with the operation of one lever, there are two levers required for the work, one lever and the one for winding and lowering the kelly bar. This is all that is required, and three operations can be performed simultaneously with two levers, further improving operability. 2) As described in 1) above, since the operation is performed with two levers, there is no need to move the lever back and there is no erroneous operation such as mistaking the lever, and it is possible to prevent danger. In addition, the time for changing the holding pattern can be shortened. 3) By using the pressure switch, failures are reduced even when operated frequently in a dirty place, and reliability is further improved as compared with the conventional push button type.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of the present invention.

FIG. 2 is a layout view inside the cab of the present invention.

FIG. 3 is an overall view of a typical pile construction machine.

[Fig. 4] Layout plan in a conventional cab

[Explanation of symbols]

a Kelly bar b Boom c Wire rope d Excavation bucket e Rotary table f Thruster cylinder g Kelly bar rotation lever h Thruster lever i Kerry bar winding up / down lever j Boom hoisting lever k Kerry bar rotation and thruster lever k ₁ Kerry bar rotation Operating side k ₂ Thruster operating side m driver's seat n Keriba drive motor o, p gear 20 pilot hydraulic source pump 21 Keriba rotation control valve 22 hydraulic pump 23a press-fitting pressure switch 23b withdrawal pressure switch 24a relays (X ₁₎ 24b relay contact (X
₁ ) 25a relay (X ₂ ) 25b relay contact (X
₂ ) 26 Thruster control valve 27 Pump (P) 28 Hydraulic piping 29 Control circuit by hydraulic pilot

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21B 11/00 E21B 7/00 E21B 17/07

Claims (4)

(57) [Claims] 1. A pile construction machine is provided with one lever that enables a kerry bar rotation operation and a thruster operation in a cab, and the left and right movements of the one lever perform left and right rotation operations of the kerry bar. An excavating lever for a pile construction machine that enables press-fitting and pulling-out operations of the kerry bar by moving back and forth. 2. A thruster operation of one lever is converted into hydraulic pressure, this is detected by a pressure switch, this is converted into an electric signal through a switching relay, and the thruster control valve is switched by the electric signal, The excavating lever for a pile construction machine according to claim 1, wherein the driving pressure oil is supplied to the thruster cylinder to press-fit and pull-out the kelly bar. 3. A thruster operation amount by one lever is detected by a pressure sensor, an electromagnetic proportional control valve is switched through a constant current amplifier, and driving pressure oil is supplied to the thruster cylinder. Drilling lever for pile construction machine. 4. The excavating lever for a pile construction machine according to claim 1, wherein the pilot oil pressure is directly supplied to the thruster control valve, and the thrust oil is supplied to the thruster cylinder for switching.