JPS59124077U

JPS59124077U - Hydraulic striking device with dry striking prevention mechanism

Info

Publication number: JPS59124077U
Application number: JP1677783U
Authority: JP
Inventors: 「え」原　裕行
Original assignee: 北越工業株式会社
Priority date: 1983-02-09
Filing date: 1983-02-09
Publication date: 1984-08-21

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 the drawing]

第１図は本考案による油圧打撃装置を示す中央縦断面図
、第２図ないし第４図は第１図に示す打撃装置の後退行
程から前進行程に至る各行程の中−央縦断面図、第５図
は油圧打撃装置のへ打防止状態の中央縦断面図をそれぞ
れ示す。１・・・シリンダ、２・・・高圧口、３・・・低圧口、
４・・・打撃ピストン、５・・・アキュムレータ、７・
・・シリンダ前室、８・・・シリンダ後室、１０・・・
前部中径部、１１・・・前部大径部、１２・・・段部、
１３・・・後部大径　　　′部、１４・・・後部小径部
、１５・・・ピストンの後側加圧面、１６・・・ピスト
ンの前側加圧面、１７・・・高圧通路、１８．１９・・
・高圧ポート、２０・・・切換バルブ、２１・・・フラ
ンジ部、２２・・・バルブボート、２３・・・バルブの
後側加圧面、２３′・・・バルブの前側加圧面、２４・
・・バルブの前端面、２５・・・低圧通路、２６．２７
−・・低圧ポート、２８・・・バルブの後室、２９．３
０・・・パイロット通路、３０，３１゜３４．３５．３
６・・・ボート、３７・・・チゼル、３Ｂ・・・チゼル
ピン、４０・・・ラビリンスパツキン、４１・・・ドレ
ン通路、４２・・・ランド部分、４３−・・・絞り部。第１図第２図FIG. 1 is a central vertical sectional view showing the hydraulic impact device according to the present invention, FIGS. 2 to 4 are center-to-center vertical sectional views of each stroke from the backward stroke to the forward stroke of the impact device shown in FIG. FIG. 5 shows a central vertical cross-sectional view of the hydraulic impact device in a state in which it is prevented from hitting. 1...Cylinder, 2...High pressure port, 3...Low pressure port,
4...Blowing piston, 5...Accumulator, 7.
...Cylinder front chamber, 8...Cylinder rear chamber, 10...
Front medium diameter part, 11... Front large diameter part, 12... Step part,
13... Rear large diameter ' part, 14... Rear small diameter part, 15... Rear pressure surface of piston, 16... Front pressure surface of piston, 17... High pressure passage, 18.19.・
・High pressure port, 20...Switching valve, 21...Flange part, 22...Valve boat, 23...Rear pressure surface of the valve, 23'...Front pressure surface of the valve, 24.
...Front end surface of the valve, 25...Low pressure passage, 26.27
-...Low pressure port, 28...Valve rear chamber, 29.3
0... Pilot passage, 30, 31° 34.35.3
6... Boat, 37... Chisel, 3B... Chisel pin, 40... Labyrinth packing, 41... Drain passage, 42... Land portion, 43-... Throttle portion. Figure 1 Figure 2

Claims

[Claims for Utility Model Registration] A piston having a stepped part that is slidable in the axial direction in a hollow part in a cylinder, and a switching valve that can be slid in the inner wall of the hollow part in the cylinder at the upper part of the piston, In the hydraulic impact device, the hollow part of the cylinder is divided into a front chamber and a rear chamber via a stepped part of the piston, and the cylinder has high pressure and low pressure passages, wherein the switching valve has a hollow cylindrical shape, and the switching valve has a hollow cylindrical shape, and The high-pressure passage is provided concentrically with the cylinder, and communicates with the rear chamber through a high-pressure port that opens in the front chamber of the cylinder and opens and closes by sliding a switching valve having a flange, and connects the high-pressure passage to the rear chamber. opening the passage into a step chamber formed by a piston step interposed between the front chamber and the rear chamber;
Further, the slidable switching valve is connected to the rear chamber through ports formed therein, and when the piston descends the most, communication between the front chamber of the cylinder and the high pressure port is cut off, and the switching valve The lower end surface of the cylinder partially closes the high-pressure port opening into the rear chamber to form a constriction part, thereby communicating the high-pressure port and the low-pressure boat through the rear chamber and stopping the driving of the piston. Hydraulic striking device equipped with a dry striking prevention mechanism.