CN215242703U

CN215242703U - Hydraulic control loop for realizing position holding of injection molding machine screw

Info

Publication number: CN215242703U
Application number: CN202120994641.9U
Authority: CN
Inventors: 陈金超; 戴国平; 胡建明; 郑衍红
Original assignee: Ningbo Zhafir Plastics Machinery Co ltd
Current assignee: Ningbo Zhafir Plastics Machinery Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-12-21
Anticipated expiration: 2031-05-11

Abstract

The utility model discloses a hydraulic control loop for realizing the position maintenance of a screw of an injection molding machine, which comprises an injection oil circuit, an injection cavity and an oil tank, wherein a cartridge valve, a directional control valve and an overflow valve with a safety function are additionally arranged between the injection oil circuit and the injection cavity, and the directional control valve controls the cartridge valve to be opened to realize the injection or the storage or the ejection of the injection molding machine; the directional control valve controls the cartridge valve to be closed, so that the injection cavity is closed, and the position of the screw rod is kept; the advantage is that it can realize the maintenance of injection molding machine screw rod position well.

Description

Hydraulic control loop for realizing position holding of injection molding machine screw

Technical Field

The utility model relates to a hydraulic control return circuit especially relates to a hydraulic control return circuit who realizes injection molding machine screw rod position holding.

Background

With the rapid development of manufacturing technology, the types of materials injected by an injection molding machine are more and more, the use working conditions are more and more complex, and many injection molding processes require that the screw position is kept after the storage is finished, namely, a client requires that the screw is kept at a set position and is not moved after the storage is finished.

Disclosure of Invention

The utility model aims to solve the technical problem that a hydraulic control return circuit that realizes injection molding machine screw rod position holding is provided, its holding that can realize injection molding machine screw rod position well.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a realize hydraulic control return circuit of injection molding machine screw rod position maintenance, includes injection oil circuit, injection chamber and oil tank, its characterized in that: a cartridge valve, a directional control valve and an overflow valve with a safety function are additionally arranged between the injection oil way and the injection cavity, and the directional control valve controls the opening of the cartridge valve to realize the injection or storage or injection and retraction of the injection molding machine; and the directional control valve controls the cartridge valve to be closed, so that the injection cavity is closed, and the position of the screw rod is kept.

The port A of the cartridge valve is communicated with the injection cavity, the port B of the cartridge valve is communicated with the injection oil path, the port C of the cartridge valve is respectively communicated with the port B of the directional control valve and the port A of the overflow valve, the port P of the directional control valve is communicated with the injection cavity, the port T of the directional control valve is communicated with the oil tank, and the port T of the overflow valve is communicated with the oil tank.

When the injection molding machine injects or stores materials or ejects and retreats, the electromagnet of the directional control valve is electrified, the port B of the directional control valve is communicated with the port T of the directional control valve, the cartridge valve is opened, the port A of the cartridge valve is communicated with the port B of the cartridge valve, and the injection oil way is communicated with the injection cavity through the port B of the cartridge valve and the port A of the cartridge valve;

when the position of the screw is required to be kept after injection or storage or injection and retraction of the injection molding machine, the electromagnet of the directional control valve is powered off, the port P of the directional control valve is communicated with the port B of the directional control valve, the cartridge valve is closed, the port A of the cartridge valve is not communicated with the port B of the cartridge valve, and at the moment, the injection cavity is closed, so that the position of the screw is kept.

And the damping used for limiting the flow of the hydraulic oil from the directional control valve to the overflow valve when the pressure in the injection cavity exceeds the set safe pressure value of the overflow valve is additionally arranged on an oil way pipeline communicated with the injection cavity through a port P of the directional control valve. Under the condition that damping is not set, when the pressure in the injection cavity exceeds the set safety pressure value of the overflow valve, hydraulic oil in the injection cavity enters the overflow valve through the directional control valve, the overflow valve fails due to too large flow, the damping is set to limit the flow, and the size of the damping hole can be limited according to the overflow flow of the overflow valve.

Compared with the prior art, the utility model has the advantages of:

1) a cartridge valve for sealing, a pilot directional control valve and an overflow valve serving as a safety valve are added between an injection oil way and an injection cavity, the opening and the closing of the cartridge valve are controlled through the pilot directional control valve, normal injection, storage and ejection are realized, meanwhile, the sealing of the injection cavity is realized through the closing of the cartridge valve, and the purpose of maintaining the position of a screw is achieved.

2) The holding of the screw position stabilizes the stock volume without the need for an additional power source to hold it.

3) And an overflow valve is arranged, so that the overhigh sealing pressure of the injection cavity is effectively prevented.

Drawings

Fig. 1 is a partial view of a hydraulic control circuit of the present invention;

FIG. 2 is a partial view of a particular hydraulic control circuit.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The utility model provides a realize hydraulic control return circuit of injection molding machine screw rod position maintenance, as shown in fig. 1, it includes injection oil circuit 1, injection chamber 2 and oil tank 3, add cartridge valve V1 between injection oil circuit 1 and the injection chamber 2, directional control valve V2 and the overflow valve V3 that plays the safety action, cartridge valve V1's A mouth and injection chamber 2 intercommunication, cartridge valve V1's B mouth and injection oil circuit 1 intercommunication, cartridge valve V1's C mouth communicates with directional control valve V2's B mouth and overflow valve V3's A mouth respectively, directional control valve V2's P mouth and injection chamber 2 intercommunication, directional control valve V2's T mouth and oil tank 3 intercommunication, overflow valve V3's T mouth and oil tank 3 intercommunication; when the injection molding machine performs injection or material storage or injection retreating, an electromagnet D1 of a directional control valve V2 is electrified, a port B of a directional control valve V2 is communicated with a port T of a directional control valve V2, a cartridge valve V1 is opened, a port A of a cartridge valve V1 is communicated with a port B of a cartridge valve V1, and an injection oil path 1 is communicated with an injection cavity 2 through the port B of the cartridge valve V1 and the port A of the cartridge valve V1; when the position of the screw needs to be maintained after injection or storage or injection and retraction of the injection molding machine, an electromagnet D1 of a directional control valve V2 is de-energized, a P port of a directional control valve V2 is communicated with a B port of the directional control valve V2, a cartridge valve V1 is closed, an A port of a cartridge valve V1 is not communicated with a B port of a cartridge valve V1, and at the moment, an injection cavity 2 is closed, so that the position of the screw is maintained.

In the present embodiment, a damping V4 for limiting the flow rate of the hydraulic oil to the relief valve V3 via the directional control valve V2 when the pressure in the injection chamber 2 exceeds the relief pressure value set by the relief valve V3 is added to the oil line through which the port P of the directional control valve V2 communicates with the injection chamber 2. Under the condition that the damping V4 is not arranged, when the pressure in the injection cavity 2 exceeds the safety pressure value set by the overflow valve V3, the hydraulic oil in the injection cavity 2 enters the overflow valve V3 through the directional control valve V2, the overflow valve V3 fails due to too large flow, therefore, the damping V4 is arranged to limit the flow, and the size of the damping hole can be limited according to the overflow flow of the overflow valve V3.

Fig. 2 shows a partial view of a specific hydraulic control circuit, in fig. 2 the rodless chamber 41 of the injection cylinder 4 is used as the injection chamber 2, and the dashed line frame is a part of the existing hydraulic control circuit.

Claims

1. The utility model provides a realize hydraulic control return circuit of injection molding machine screw rod position maintenance, includes injection oil circuit, injection chamber and oil tank, its characterized in that: a cartridge valve, a directional control valve and an overflow valve with a safety function are additionally arranged between the injection oil way and the injection cavity, and the directional control valve controls the opening of the cartridge valve to realize the injection or storage or injection and retraction of the injection molding machine; and the directional control valve controls the cartridge valve to be closed, so that the injection cavity is closed, and the position of the screw rod is kept.

2. The hydraulic control circuit for achieving screw position holding of an injection molding machine according to claim 1, wherein: the port A of the cartridge valve is communicated with the injection cavity, the port B of the cartridge valve is communicated with the injection oil path, the port C of the cartridge valve is respectively communicated with the port B of the directional control valve and the port A of the overflow valve, the port P of the directional control valve is communicated with the injection cavity, the port T of the directional control valve is communicated with the oil tank, and the port T of the overflow valve is communicated with the oil tank.

3. The hydraulic control circuit for achieving screw position holding of an injection molding machine according to claim 2, wherein: when the injection molding machine injects or stores materials or ejects and retreats, the electromagnet of the directional control valve is electrified, the port B of the directional control valve is communicated with the port T of the directional control valve, the cartridge valve is opened, the port A of the cartridge valve is communicated with the port B of the cartridge valve, and the injection oil way is communicated with the injection cavity through the port B of the cartridge valve and the port A of the cartridge valve;

4. A hydraulic control circuit for achieving screw position holding of an injection molding machine according to claim 2 or 3, wherein: and the damping used for limiting the flow of the hydraulic oil from the directional control valve to the overflow valve when the pressure in the injection cavity exceeds the set safe pressure value of the overflow valve is additionally arranged on an oil way pipeline communicated with the injection cavity through a port P of the directional control valve.