JPS5989136U

JPS5989136U - Drop hammer lifting device

Info

Publication number: JPS5989136U
Application number: JP18055282U
Authority: JP
Inventors: 良二林
Original assignee: 三菱重工業株式会社
Priority date: 1982-12-01
Filing date: 1982-12-01
Publication date: 1984-06-16

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図は従来のドロップハンマの昇降装置の一部を縦断
して示した正面図、第２図はその回路図、第３図はその
加部の一部縦断正面図、第４図は第３図の矢視ＩＶ−Ｉ
Ｖ図、第５図は本案に係るドロップハンマの昇降装置の
一実施例を示す縦断面図、第６図は第５図の矢視ＶＩ−
ＶＩ図、第７図乃至第９図はその作動工程を示す縦断面
図である。２１・・・・・・内シリンダ、２２・・・・・・外シリ
ンダ、２３・・・・・・フリーピストン、２４・・・・
・・ピストンロッド、２５・・・・・・ウェイト、２６
・・・・・・ピストン、２７・・・・・・空気孔、２８
・・・・・・バルブピストン、２９・・・・・・上部ポ
ート、３０・・・・・・中央ポート、３１・・・・・・
下部ポート。Fig. 1 is a front view showing a part of a conventional lifting device for a drop hammer, Fig. 2 is a circuit diagram thereof, Fig. 3 is a partially longitudinal front view of an additional part thereof, and Fig. 4 is a front view showing a part of the elevating device of a conventional drop hammer. Arrow view IV-I in Figure 3
FIG. V and FIG. 5 are longitudinal cross-sectional views showing an embodiment of a drop hammer lifting device according to the present invention, and FIG. 6 is a view taken in the direction of arrow VI- in FIG.
FIG. VI and FIGS. 7 to 9 are longitudinal cross-sectional views showing the operating process. 21...Inner cylinder, 22...Outer cylinder, 23...Free piston, 24...
... Piston rod, 25 ... Weight, 26
...Piston, 27...Air hole, 28
... Valve piston, 29 ... Upper port, 30 ... Center port, 31 ...
bottom port.

Claims

[Scope of utility model registration request]

In a drop hammer lifting device configured to raise and lower a weight using a fluid cylinder, both the inner and outer cylinders are arranged concentrically so that the annular space formed between the two cylinders communicates with the inside of the inner cylinder and the bottom end of the soil. A piston supporting a weight is slidably fitted into the inner cylinder through a free piston and a piston rod, and the space between the two pistons is communicated with the atmosphere through an air hole in the piston rod. A valve piston for opening and closing a lower end opening of the inner cylinder is slidably fitted into the outer cylinder below the inner cylinder, and an upper port communicating with the annular space and a piston are provided on the peripheral wall of the outer cylinder. A lifting device for a drop hammer, characterized in that a central port communicating with an inner cylinder and a lower port communicating with a lower surface of a valve piston are provided below the lowering position.