JPH0250436U

JPH0250436U -

Info

Publication number: JPH0250436U
Application number: JP13025488U
Authority: JP
Priority date: 1988-10-04
Filing date: 1988-10-04
Publication date: 1990-04-09
Anticipated expiration: 2003-10-04
Also published as: JPH0630900Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の液圧回路図、第２
図は第１図の液圧回路で普通操作により重錘を上
昇させて位置決めを行う場合の液圧回路図、第３
図は第１図の液圧回路で普通操作により重錘を下
降させて位置決めを行う場合の液圧回路図、第４
図は第１図の液圧回路でハンマ作業において重錘
を上昇させる場合の液圧回路図、第５図は第１図
の液圧回路でハンマ作業において重錘を下降させ
る場合の液圧回路図、第６図は重錘の昇降をクラ
ツチ付ウインチにより行う従来の杭打機の一例の
側面図、第７図は第６図の杭打機を改良して流体
圧シリンダにより重錘を昇降させるようにした杭
打機の斜視図である。図中１４は液圧シリンダ、１４ａはピストンロ
ツド、１７はスライドガイド、２２，２３は昇降
シーブ、２４は固定シーブ、２５は液圧ポンプ、
２６は吐出流路、２７は制御弁、２８，２９は流
路、３１は可変流量調整弁、３２は流路、３３は
ピストンロツド側液室、３４はカウンターバラン
ス弁、３７は流路、３９は可変流量調整弁、４０
は流路、４１はヘツド側液室、４３は電磁切換弁
、４４はパイロツト切換弁、４５は流路、４６は
パイロツト流路、４７，４９は流路、５１はカウ
ンターバランス弁、５２は流路、５３はアキユム
レータを示す。 Fig. 1 is a hydraulic circuit diagram of one embodiment of the present invention;
The figure is a hydraulic circuit diagram when the hydraulic circuit in Figure 1 is used to raise the weight and position it by normal operation.
The figure is a hydraulic circuit diagram when positioning is performed by lowering the weight in normal operation using the hydraulic circuit in Figure 1.
The figure shows the hydraulic circuit shown in Fig. 1 when raising the weight during hammer work, and Fig. 5 shows the hydraulic circuit shown in Fig. 1 when lowering the weight during hammer work. Figure 6 is a side view of an example of a conventional pile driver that uses a winch with a clutch to raise and lower the weight, and Figure 7 is an improved version of the pile driver shown in Figure 6, which raises and lowers the weight using a hydraulic cylinder. FIG. In the figure, 14 is a hydraulic cylinder, 14a is a piston rod, 17 is a slide guide, 22 and 23 are lifting sheaves, 24 is a fixed sheave, 25 is a hydraulic pump,
26 is a discharge flow path, 27 is a control valve, 28, 29 are flow paths, 31 is a variable flow rate adjustment valve, 32 is a flow path, 33 is a piston rod side liquid chamber, 34 is a counterbalance valve, 37 is a flow path, 39 is a Variable flow control valve, 40
41 is a flow path, 41 is a head side liquid chamber, 43 is an electromagnetic switching valve, 44 is a pilot switching valve, 45 is a flow path, 46 is a pilot flow path, 47 and 49 are flow paths, 51 is a counterbalance valve, and 52 is a flow path. 53 indicates an accumulator.

Claims

[Scope of utility model registration request]

A required number of elevating sheaves are attached to a slide guide that can be moved up and down along the leader by a hydraulic cylinder, and a required number of fixed sheaves are arranged above the elevating sheaves of the leader, with one end fixed at a predetermined position. In a pile driving machine in which a wire is hung between the fixed sheave and the elevating sheave, and a weight is suspended from the other end, at least a control valve capable of switching the flow direction of the liquid supplied from the hydraulic pump is provided. Two flow paths are connected, one flow path is connected to the header side liquid chamber of the hydraulic cylinder, the other flow path is connected to the piston rod side liquid chamber of the hydraulic cylinder, and the one flow path is connected to the piston rod side liquid chamber of the hydraulic cylinder. An accumulator is connected through a pilot switching valve and a counterbalance valve, and an electromagnetic switching valve is connected to the other flow path, and the electromagnetic switching valve and the pilot switching valve are connected by a flow path. A flow path that switches the pilot switching valve when the flow path and the other flow path communicate with each other due to switching of the electromagnetic switching valve, and connects the pilot switching valve and the electromagnetic switching valve to the accumulator via the counterbalance valve. A hydraulic circuit for a pile driver, characterized in that a pilot flow path is connected to the hydraulic circuit.