JPH02150225U

JPH02150225U -

Info

Publication number: JPH02150225U
Application number: JP5866489U
Authority: JP
Priority date: 1989-05-23
Filing date: 1989-05-23
Publication date: 1990-12-25
Anticipated expiration: 2004-05-23
Also published as: JPH0646657Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例に係るトグル式射出
成形機のシヨツク防止油圧回路の回路構成例を、
型締装置の概略構成と共に示した構成図である。主要部の符号の説明、４……可動プレート、５
……可動側金型、７……トグル機構、９……型締
シリンダー、１０……方向切換弁、１３……圧油
供給源、１４……タンク、１５……チエツク弁、
１６……リリーフライン、１７……主リリーフ弁
、１８……パイロツトリリーフ弁、１９……パイ
ロツトライン、２０……ドレンライン。 FIG. 1 shows an example of the circuit configuration of a shock prevention hydraulic circuit for a toggle injection molding machine according to an embodiment of the present invention.
It is a block diagram shown together with the schematic structure of a mold clamping device. Explanation of symbols of main parts, 4...Movable plate, 5
...Movable side mold, 7...Toggle mechanism, 9...Mold clamping cylinder, 10...Directional switching valve, 13...Pressure oil supply source, 14...Tank, 15...Check valve,
16... Relief line, 17... Main relief valve, 18... Pilot relief valve, 19... Pilot line, 20... Drain line.

Claims

[Claims for Utility Model Registration] A mold clamping cylinder that clamps and opens an injection mold through a toggle mechanism, a directional control valve that switches the direction of hydraulic pressure to control the cylinder, and a head side pressure oil supply path connecting the A port of the switching valve and the head side of the cylinder via a check valve;
A rod side pressure oil supply path connecting the B port of the switching valve and the rod side of the cylinder, and a T port of the switching valve.
A tank connected to the port, a pressure oil supply source connected to the P port of the switching valve, and a connection between the head side pressure oil supply path between the head side of the cylinder and the check valve and the tank. and a main relief valve, and the switching valve is configured to operate at P during the mold clamping.
The port is connected to the A port, and the P port and B port are connected when the mold is opened, and the inlet port connected to the vent port of the main relief valve and the rod side pressure a pilot relief valve having a pilot port connected to the oil supply passage; and a drain port connected to the head side pressure oil supply passage between the check valve and the A port; If the hydraulic pressure of the pilot port is less than a predetermined set pressure, the communication between the inlet port and the drain port is cut off, and if the hydraulic pressure of the pilot port exceeds the set pressure, the inlet port and the drain port are disconnected. A shock prevention hydraulic circuit for a toggle injection molding machine, characterized in that the circuit is configured to communicate with a port.