JPS5880438U

JPS5880438U - hydraulic drop hammer

Info

Publication number: JPS5880438U
Application number: JP17446981U
Authority: JP
Inventors: 郁郎橋本; 下田　勝義; 成瀬　弘敏; 孝司宇佐美; 川瀬　信行
Original assignee: 日本車輌製造株式会社
Priority date: 1981-11-24
Filing date: 1981-11-24
Publication date: 1983-05-31

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の油圧ド゛ａツブハンマの油圧回路を示す
系統図、第２図乃至第４図は本考案の一実施例を示すも
ので、第２図は油圧シリンダ部の詳細断面図、第３図及
び第４図は第２図の油圧シリンダに連結した油圧回路を
示す系統図で、第３図は重錘を上昇させる場合を、第４
図は重錘を下降させる場合を示す図である。８はシリンダ、８ａはシリンダピストン、８ｂ。８Ｃはシリンダロッド、９．１０はケーシング、１１は
重錘、１２は案内金具、１３はハンマガイド、１４はマ
ニホールド、１５はアキュームレータ、１６は把持装置
、１７．１８．１９．２０は緩衝部材、２１は配管、２
２は滑車、２３はワイヤロープ、２４，２５．２６はパ
イロットチェック弁、２７．２８．２９はロジック弁、
３０はチェック弁、３１．３２はソレノイド切換弁、３
３はアキュームレータ、３４はリリーフバルブ、３５は
チェックバルブ、３６は油タンク、３７乃至５３は油圧
配管である。秀２因ｎ＠麦４図　　〜イ３５ＬＬＦ−郭Fig. 1 is a system diagram showing the hydraulic circuit of a conventional hydraulic dowel hammer, Figs. 2 to 4 show an embodiment of the present invention, and Fig. 2 is a detailed sectional view of the hydraulic cylinder section; Figures 3 and 4 are system diagrams showing the hydraulic circuit connected to the hydraulic cylinder in Figure 2, and Figure 3 shows the case where the weight is raised;
The figure shows the case where the weight is lowered. 8 is a cylinder, 8a is a cylinder piston, and 8b. 8C is a cylinder rod, 9.10 is a casing, 11 is a weight, 12 is a guide fitting, 13 is a hammer guide, 14 is a manifold, 15 is an accumulator, 16 is a gripping device, 17.18.19.20 is a buffer member, 21 is piping, 2
2 is a pulley, 23 is a wire rope, 24, 25, 26 is a pilot check valve, 27, 28, 29 is a logic valve,
30 is a check valve, 31.32 is a solenoid switching valve, 3
3 is an accumulator, 34 is a relief valve, 35 is a check valve, 36 is an oil tank, and 37 to 53 are hydraulic pipes. Hide 2 cause n @ Mugi 4 figure ~ I35LLF-Guo

Claims

[Scope of utility model registration request]

In a hydraulic drop hammer that strikes a pile by raising or dropping a weight using double-rod type hydraulic cylinders, the diameter of the upper cylinder rod is made slightly smaller than that of the lower cylinder, and a flow that sends pressure oil also to the upper side of the cylinder piston is used. A flow path is provided that communicates the upper and lower sides of the cylinder piston, and a logic valve that opens and closes according to pilot pressure is placed in the flow path, so that when the weight falls, it acts downward due to the difference in the diameter of both cylinders. A hydraulic drop hammer characterized by applying force to a weight.