JPH0533561Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydraulic circuit for a pile driver.

[Prior Art] Generally, in a pile driving machine, after drilling a pile hole with an auger, the pile is inserted into the pile hole to perform driving work. In this case, one end of the squeezing rope is fixed to the frame of the auger motor, and the other end is wound up with a winch to give a squeezing action to the auger and force the auger into the ground. Figure 2 shows the hydraulic circuit of a winch used for conventional auger press-fitting. During auger press-fitting work, pressure oil from a pressure oil source 1 from all pumps is supplied to a supply and discharge pipe 3 by operating a control valve 2 for auger press-fitting. Pressure oil is supplied to the winch motor 4 via the winch motor 4, and is also discharged from the winch motor 4 and returned to the tank 6 through the supply/discharge pipe 5. Reference numeral 7 denotes a counterbalance valve provided in the supply/discharge pipe 3 that serves as the supply side of pressure oil during auger press-fitting work.

In the case of such a hydraulic circuit, since the winch motor 4 is driven at a constant speed, it does not correspond to the excavation speed of the auger, and the rotation of the auger may stop due to excessive pressing force. Become. Therefore,
By operating the control valve 2, the driver drives the winch motor 4 intermittently to wind up the squeezing rope.

[Problems to be solved by the invention] However, even if the drive of the winch motor 4 is stopped by such an operation, the rotation of the auger may still be stopped due to the rope tension. This was a very troublesome task for the driver, and it was difficult to apply pressing force to the auger efficiently.

In view of these circumstances, the present invention is designed to efficiently apply pressing force to the auger.

[Means for Solving the Problems] The present invention provides auger press-fitting work in a winch hydraulic circuit in which supply and exhaust pipes connected to the input and output sides of the winch motor are connected to a pump via a winch operation control valve. A pilot check valve is provided in the middle of the supply/discharge pipe, which sometimes serves as the pressure oil supply side, toward the winch motor side, and one end of the supply-side supply/discharge pipe is connected to a tank at a position between the pilot check valve and the winch motor. Connect the other end of the control pipe that led the control pipe, connect the pressure oil supply pipe from a small operating pump such as an outrigger to the middle part of the control pipe, and connect the pressure oil supply pipe connection part of the control pipe to the tank. A pilot relief valve is provided at a position between the pilot relief valve and a remote control valve for adjusting the relief pressure of the pilot relief valve.

[Function] With the winch operation control valve held in the pressure oil supply stop position, the pressure oil from the outrigger small pump is sent to the supply side supply/discharge pipe via the pressure oil supply pipe and control pipe to activate the winch motor. Drive. At this time, the relief pressure of the pilot relief valve is adjusted by operating the remote control valve, and the pressure of the pressure oil flowing to the supply side supply and discharge pipe is adjusted. This adjusts the drive speed of the winch motor. or,
When the auger penetration speed is slow, excess pressure oil is relieved by the pilot relief valve and returned to the tank.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

As shown in Fig. 1, the pilot pressure introduced from the supply and discharge pipe 5 is placed between the counterbalance valve 7 of the supply and discharge pipe 3, which serves as the pressure oil supply side, and the control valve 2 for winch operation during press-fitting work. A pilot check valve 8 which is activated by the above is provided facing the winch motor 4 side, and one end is guided to the tank 6 at a position between the counterbalance valve 7 of the supply/discharge pipe 3 and the pilot check valve 8. control tube 9
At the same time, a pressure oil supply pipe 11 from a control valve 10 for operating an outrigger or the like is connected to the middle part of the control pipe 9, and the control pipe 9 has a connection part and a supply pipe 11 connection part. A check valve 12 is provided between the supply and discharge pipe 3, facing the supply pipe 3 side, and a pilot relief valve 13 is provided between the connection portion of the supply and discharge pipe 11 and the tank 6, facing the tank 6 side. , and further the pilot relief valve 13
An operation pipe 15 from a remote control valve 14 for adjusting the relief pressure is connected to the . Reference numeral 16 indicates a small pump for operating an outrigger or the like.

In FIG. 1, the same reference numerals as in FIG. 2 indicate the same parts.

In such a configuration, when the winch motor 4 is driven to wind up the squeezing rope and perform auger press-fitting, the control valve 2 is held at the pressure oil supply stop position as shown in the figure, and the pressure oil from the small pump 16 is stopped. It is led to the supply/discharge pipe 3 via the control valve 10, the supply pipe 11, and the control pipe 9. Incidentally, since the outriggers and the like are normally held in position by blocking pressure oil after operation, no problem will occur even if the pressure oil flows from the supply pipe 11 to another location. Thus, the pressure oil from the small pump 16 guided to the supply/discharge pipe 3 flows through the counterbalance valve 7.
The signal is sent to the winch motor 4 via the motor, and drives the winch motor 4. Pressure oil discharged from the winch motor 4 is returned to the tank 6 through the supply/discharge pipe 5.

In the above, the pressure oil sent from the supply pipe 11 to the control pipe 9 is transferred to the pilot relief valve 13.
When opened, it is returned to tank 6. Therefore, by operating the remote control valve 14 to adjust the relief pressure of the pilot relief valve 13, the pressure of the pressure oil sent from the control pipe 9 to the supply/discharge pipe 3 can be adjusted.

In addition, the winding speed of the squeezing rope is set to the appropriate auger excavation speed or slightly faster, so when the amount of pressure oil supplied to the winch is higher, such as when the ground is hard and the excavation speed is slow, the pilot The relief valve will relieve the excess oil and return it to the tank.

In this way, since the pressure of the pressure oil sent to the supply/discharge pipe 3 can be adjusted, the driving force of the winch motor 4 can be adjusted, so a pressing force corresponding to the excavation state can be applied to the auger. I can do it. In addition, if the remote control valve is not operated, the pressure of the pilot relief valve is set to atmospheric pressure, and all the pressure oil from the small pump returns to the tank, so there is no effect on normal hoisting and lowering operations.

It should be noted that the present invention is not limited to the embodiments described above, and it goes without saying that various changes may be made without departing from the gist of the present invention.

[Effects of the invention] As explained above, according to the hydraulic circuit for auger press-fitting of the invention, the drive force of the winch motor can be adjusted arbitrarily by operating the remote control valve, so that the auger can adjust the excavation speed. The corresponding pressing force can be applied efficiently, energy loss can be minimized, and normal hoisting,
Excellent effects such as ease of operation without affecting the lowering operation can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an auger press-fitting hydraulic circuit according to the present invention, and FIG. 2 is an explanatory diagram of a conventional example. 1 is a hydraulic power source from all pumps, 2 is a control valve for winch operation, 3 is a supply/discharge pipe, 4 is a winch motor, 5 is a supply/discharge pipe, 6 is a tank, 8 is a pilot check valve, 9 is a control pipe, 10 11 is a pressure oil supply pipe, 13 is a pilot relief valve, 14 is a remote control valve, 15 is an operating pipe, and 16 is a small pump for operating outriggers.

Claims (1)

[Scope of utility model registration request] In a hydraulic circuit in which the supply and discharge pipes connected to the inlet and outlet sides of the winch motor are connected to the pump via a control valve, there is a part of the supply and discharge pipe that serves as the pressure oil supply side during auger press-fitting work, pointing toward the winch motor side. At the same time, a pilot check valve is provided at the supply side supply/discharge pipe, and one end of the control pipe leading to the tank is connected to a position between the pilot check valve and the winch motor, and the other end of the control pipe is connected to the middle part of the control pipe. A pressure oil supply pipe from another small pump is connected, and a pilot relief valve is provided at a position between the pressure oil supply pipe connection part of the control pipe and the tank, and the relief pressure of the pilot relief valve is further adjusted. A hydraulic circuit for a pile driver, characterized in that it is equipped with a remote control valve.