CN201346841Y

CN201346841Y - Hydraulic insurance circuit of large injection molding machine

Info

Publication number: CN201346841Y
Application number: CNU2008201700947U
Authority: CN
Inventors: 林晖; 俞继印
Original assignee: NINGBO HAITIAN HEAVY INDUSTRY MACHINERY Co Ltd
Current assignee: Haitian Plastics Machinery Group
Priority date: 2008-12-18
Filing date: 2008-12-18
Publication date: 2009-11-18
Anticipated expiration: 2018-12-18

Abstract

The utility model relates to a hydraulic insurance circuit of a large injection molding machine, comprising a retractable mold valve, a cartridge inserted valve A, a cartridge inserted valve B, a travel valve, a retractable mold cylinder and a change valve. The pressure port of the retractable mold valve is connected with the pressure oil. The oil outlet is communicated receptively with the pressure port of the change valve, the pressure port of the travel valve, the inlets of the cartridge inserted valve A and B. A working port and the outlet of the cartridge inserted valve A are connected with the closing mold cavity of the retractable mold cylinder. The other working port is communicated with the opening mold cavity of the retractable mold cylinder. The outlet of the cartridge inserted valve B is connected with an oil tank. The pressure port of the change valve is connected with the pressure port of the travel valve. The working port of the change valve and a working port of the retractable mold valve are respectively connected with the shuttle valve binary oil inlet on the cartridge inserted valve A. The shuttle valve outlet on the cartridge inserted valve A is connected with the control valve of the cartridge inserted valve A. The working port of the change valve and the working port of the travel valve are respectively connected with the shuttle valve binary oil inlet on the cartridge inserted valve B. The outlet of the shuttle valve is connected with the control cavity of the cartridge inserted valve B. The hydraulic insurance circuit of a large injection molding machine has the advantages of compact structure, low cost, less pressure loss and obvious effect.

Description

Large size plastic jetting-moulding device hydraulic pressure security circuit

Technical field

The utility model relates to the hydraulic pressure security circuit of large size plastic jetting-moulding device.

Background technology

Produce and personal safety in order to ensure, the folding mould part of injection machine has the hydraulic pressure security circuit usually, to guarantee can not to carry out or stop folding mould action, particularly mould assembling action special or in emergency circumstances.

Existing large size plastic jetting-moulding device hydraulic pressure security circuit often adopts the control mode before big latus rectum inserted valve directly is connected on the hydraulic oil import of folding moulding oil road, as shown in Figure 1, control inserted valve V8 spool and close and disconnect the import hydraulic oil by touching hydraulic stroke valve V5 when safety door is opened, this hydraulic pressure security circuit need increase a big latus rectum inserted valve V8, corresponding valve plate also strengthens, increased the cost of machine, the design of machine and assembling have also been increased difficulty; And because many this inserted valve V8 on the major loop, the pressure loss of oil circuit strengthens; Before also having inserted valve directly to be connected on the hydraulic oil import, the switch die cavity directly is communicated with and does not pass through this inserted valve when matched moulds fast because in the die cylinder, and then to insure when working overshoot bigger for hydraulic pressure.

The utility model content

Technical problem to be solved in the utility model has provided a kind of hydraulic pressure security circuit of large size plastic jetting-moulding device, in order to overcome the existing above-mentioned shortcoming of present large size plastic jetting-moulding device hydraulic pressure security circuit.

The utility model solves the problems of the technologies described above the technical scheme that is adopted:

The hydraulic pressure security circuit of large size plastic jetting-moulding device, comprise folding mould valve, the inserted valve first, inserted valve second, the stroke valve, folding mould oil cylinder and continuous reversal valve thereof by safety door control, it is characterized in that: described inserted valve first, inserted valve second is the inserted valve of band shuttle valve structure, the pressure port of described folding mould valve connects pressure oil, the pressure port of oil-out and reversal valve, the pressure port of stroke valve, the inserted valve first, the bottom surface import of second communicates, outlet is connected with the matched moulds chamber of folding mould oil cylinder a working hole with the inserted valve first, another working hole communicates with the die sinking chamber of folding mould oil cylinder, the outlet connected tank of inserted valve second, the pressure port of reversal valve links to each other with the pressure port of stroke valve, the working hole of the working hole of reversal valve and the folding mould valve that links to each other with folding mould valve matched moulds chamber links to each other with shuttle valve two oil-ins on the inserted valve first respectively, the outlet of the shuttle valve on the inserted valve first links to each other with the control chamber of inserted valve first, the working hole of the working hole of reversal valve and stroke valve links to each other with shuttle valve two oil-ins on the inserted valve second respectively, and the outlet of the shuttle valve on the inserted valve second links to each other with the control chamber of inserted valve second.

Original folding moulding oil line structure remains unchanged in the hydraulic pressure security circuit of above-mentioned large size plastic jetting-moulding device, two inserted valves on the hydraulic circuit have been made into the inserted valve of band shuttle valve structure, touch the change that the hydraulic stroke valve makes that stroke valve oil inlet and outlet path takes place when opening by safety door, thereby the control oil of the control chamber of these two inserted valves is also changed thereupon, this two inserted valves spool is closed simultaneously, reach cut-out die cylinder way to cycle oil purpose and realize the hydraulic pressure insurance.

Compared with prior art, advantage of the present utility model is:

Owing to saved big latus rectum inserted valve, dwindled valve plate, large size plastic jetting-moulding device not only oil channel structures is compacter, provides cost savings, but also has reduced the pressure loss, the most important thing is that the effect of hydraulic pressure insurance obviously improves.

Description of drawings

Fig. 1 is existing large size plastic jetting-moulding device hydraulic pressure security circuit.

Fig. 2 is the hydraulic pressure security circuit schematic diagram of the utility model embodiment.

Among the figure: V1 represents to control the reversal valve of die cylinder action.

V2, V3, V4, V6, V7 represent the supporting hydraulic valve on moulding oil road, folding pass.

V5, V8 represent the hydraulic pressure easing valve of folding moulding oil road break-make.

D1, D2, D3 represent to control the electromagnet of reversal valve action.

P represents system high pressure oil.

T represents the low pressure oil return.

Dotted line is the control oil circuit.

Solid line is a working connection.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 2, large-scale molding machine hydraulic pressure security circuit, the P1 mouth of folding mould valve V1 connects pressure oil, the T1 mouth communicates with the bottom surface import of inserted valve V2, V3, outlet is connected with the matched moulds chamber of die cylinder the A1 mouth of V1 with inserted valve V2, the B1 mouth communicates with the die sinking chamber, inserted valve V3 exports connected tank, control that the A1 mouth of the B3 mouth of stroke valve V4 and folding mould valve V1 is drawn oil makes the control oil that wherein pressure is high enter valve V2 control chamber C1 through the shuttle valve on the V2, and the pressure oil of the control chamber C2 of V3 is determined by the shuttle valve on the V3 by the control oil of the B3 mouth of the A2 of valve V4 and valve V5.

Because valve V6, V7 are relevant and irrelevant with the hydraulic pressure insurance during only with oil circuit die sinking quick acting, just do not do introduction here in addition.

When safety door is closed, safety door is pushed down the roller of reversal valve V5, at this moment the P3 mouth of reversal valve V5 and B3 mouth are obstructed, inserted valve V3 control chamber C2 communicates with oil back chamber all the time, then valve V3 spool is opened, oil inlet and outlet can flow freely, and promptly whole working connection oil return is open-minded, and injection machine can carry out normal folding mould action under folding mould valve V1 control.

When safety door is opened; safety door is not pressed onto the roller of reversal valve V5; at this moment the P3 mouth of reversal valve V5 and B3 mouth communicate; the chamber, the end of inserted valve V3 communicates with control chamber and pressure equates; because the relation of area ratio and spring force about the inserted valve spool; the V3 spool is closed; oil inlet and outlet is obstructed; in like manner the chamber, the end of inserted valve V2 equates also that with control chamber C1 pressure the V2 spool is also closed, and the oil return of die cylinder is just closed and can't circulate by two inserted valves like this; so no matter machine is in die sinking or matched moulds; oil return in the die cylinder all can't be flowed back to fuel tank, and at this moment injection machine just stops the action of folding mould, plays the effect of hydraulic pressure insurance.

When injection machine is in quick matched moulds, when being the D2 energising, because the P2 of stroke valve V4 and A2 are communicated with, the chamber, the end of inserted valve V3 equates with control chamber pressure, in like manner V3 closes obstructed, and the P1 of V1 and A1, B1 and T1 communicate during matched moulds, then the oil return in die sinking chamber directly enters the matched moulds chamber by the V2 oil inlet and outlet in the die cylinder, carry out quick matched moulds, safety door is as opening at this moment, and V2, V3 spool are closed simultaneously, and then the oil cylinder oil return is sealed immediately and can't be discharged, mould assembling action stops immediately, hydraulic pressure insurance work and overshoot very little.

Claims

1, the hydraulic pressure security circuit of large size plastic jetting-moulding device, comprise folding mould valve, the inserted valve first, inserted valve second, the stroke valve, folding mould oil cylinder and continuous reversal valve thereof by safety door control, it is characterized in that: described inserted valve first, inserted valve second is the inserted valve of band shuttle valve structure, the pressure port of described folding mould valve connects pressure oil, the pressure port of oil-out and reversal valve, the pressure port of stroke valve, the inserted valve first, the bottom surface import of second communicates, outlet is connected with the matched moulds chamber of folding mould oil cylinder a working hole with the inserted valve first, another working hole communicates with the die sinking chamber of folding mould oil cylinder, the outlet connected tank of inserted valve second, the pressure port of reversal valve links to each other with the pressure port of stroke valve, the working hole of the working hole of reversal valve and the folding mould valve that links to each other with folding mould valve matched moulds chamber links to each other with shuttle valve two oil-ins on the inserted valve first respectively, the outlet of the shuttle valve on the inserted valve first links to each other with the control chamber of inserted valve first, the working hole of the working hole of reversal valve and stroke valve links to each other with shuttle valve two oil-ins on the inserted valve second respectively, and the outlet of the shuttle valve on the inserted valve second links to each other with the control chamber of inserted valve second.