CN205572952U - A hydraulic circuit that is used for system security controls of large -scale injection molding machine compound die - Google Patents

Abstract

A hydraulic circuit for the safety control of the mold clamping system of a large injection molding machine, including a mechanical directional valve for the front door, a mechanical directional valve for the rear door, a cartridge valve, a shuttle valve, and a cartridge valve with detection function. The shuttle valve is bridged between the directional valve and the cartridge valve with detection function. The shuttle valve, the front door mechanical directional valve and the rear door mechanical directional valve jointly control the closing of the cartridge valve with detection function, and finally control the movement of the opening and closing cylinder to stop. The utility model can effectively ensure that the mold opening and closing actions cannot be carried out when the front safety door and the rear safety door are opened separately or at the same time, and can accurately, timely and effectively stop the mold opening and closing actions, ensuring the safety of the operator; The cartridge valve with confirmation detection function provides the detection function of closing in place, which has higher safety performance. The entire hydraulic safety circuit has simple structure, convenient installation and simple maintenance, and can be applied to injection molding machines and other equipment with relatively high safety requirements.

Description

A hydraulic circuit for safety control of clamping system of large injection molding machine

technical field

The utility model relates to a hydraulic circuit used for the safety control of the clamping system of a large injection molding machine.

Background technique

The existing large-scale injection molding machine mold clamping system safety control hydraulic insurance circuit, usually by cutting off the control oil of the main valve that pushes the electro-hydraulic directional valve to open and close the mold to meet the safety requirements, the hydraulic insurance mechanism of the injection molding machine can greatly improve the injection molding performance. The security level of the machine itself. However, in the actual use process, sometimes the main valve is stuck due to various reasons, which makes the safety insurance failure of the control oil circuit very easy to occur. Moreover, in some foreign regions, the equipment safety requirements are relatively high. Both the front door and the back door can trigger and cut off the main oil circuit of the mold opening and closing valve in time.

Utility model content

The utility model provides a hydraulic circuit for the safety control of the mold clamping system of a large injection molding machine to overcome the above disadvantages, making it safer and more reliable.

The purpose of the utility model is achieved through the following technical solutions.

A hydraulic circuit for the safety control of the mold clamping system of a large injection molding machine, including a mechanical directional valve for the front door, a mechanical directional valve for the rear door, a cartridge valve, a shuttle valve, and a cartridge valve with detection function. The shuttle valve is bridged between the directional valve and the cartridge valve with detection function. The shuttle valve, the front door mechanical directional valve and the rear door mechanical directional valve jointly control the closing of the cartridge valve with detection function, and finally control the movement of the mold opening and closing cylinder to stop.

The above-mentioned cartridge valve with detection function provides a detection signal of the valve closing in place to the controller, which can effectively monitor the time and situation of the valve port closing in place, and output the closing feedback signal of the main valve core to the controller, which effectively improves the performance of the valve. The security level on the device.

The utility model can effectively ensure that the mold opening and closing actions cannot be carried out when the front safety door and the rear safety door are opened separately or at the same time, and can accurately, timely and effectively stop the mold opening and closing actions, ensuring the safety of the operator; The cartridge valve with confirmation detection function provides the detection function of closing in place, and has higher safety performance. The entire hydraulic safety circuit has a simple structure, convenient installation and maintenance, and can be applied to injection molding machines and other equipment with relatively high safety requirements.

Description of drawings

Figure 1 is a schematic diagram of the hydraulic circuit for the safety control of the clamping system of a large injection molding machine according to the embodiment of the utility model. The front safety door and the rear safety door are closed at the same time, the hydraulic circuit for the safety control of the injection molding machine is normal, and the equipment works normally.

Fig. 2 is the circuit diagram of the safety door opening before the opening and closing hydraulic circuit of the utility model embodiment, and the opening and closing action stops.

Fig. 3 is the circuit diagram of the safety door opening after the mold opening and closing hydraulic circuit of the embodiment of the utility model, and the mold opening and closing action stops.

Fig. 4 is the circuit diagram of the opening and closing hydraulic circuit of the utility model embodiment, the front safety door is opened and the rear safety door is opened simultaneously, and the opening and closing action stops.

detailed description

Below in conjunction with accompanying drawing embodiment the utility model is described further.

As shown in Figure 1, a hydraulic circuit used for the safety control of the mold clamping system of a large injection molding machine includes a mechanical directional valve 1 for the front door, a mechanical directional valve 3 for the rear door, a cartridge valve 4, a shuttle valve 5, and a cartridge valve with detection function. Valve 6, bridge the shuttle valve 5 between the front door mechanical directional valve 1, the rear door mechanical directional valve 3 and the cartridge valve 6 with detection function, the shuttle valve 6, the front door mechanical directional valve and the rear door mechanical directional valve jointly control the The closing of the cartridge valve controls the movement of the mold opening and closing cylinder to stop.

The following four working conditions of the above-mentioned hydraulic circuit are described sequentially when the front safety door touch panel is released, the rear safety door touch panel is released, the front safety door touch panel and the rear door touch panels are both released, and the front safety door touch panel and the rear safety door touch panels are both pressed down.

When the front safety door touch panel is released and the rear safety door touch panel is pressed: as shown in Figure 2, the high-pressure control oil of the system communicates with chamber B through the P chamber of the mechanical directional valve 1 of the front door, passes through the shuttle valve 5 and communicates with the chamber with detection function. The upper cavity of the cartridge valve 6 is connected, because the area of the upper cavity of the cartridge valve is larger than the area of the lower cavity, and the pressure oil presses and closes the cartridge valve 6 with detection function. When the pressing and closing action of the cartridge valve 6 is completed, the detection point of the cartridge valve 6 with detection function provides a closing signal to the controller, and the controller cuts off the oil supply to the system, so that the injection molding machine cannot open and close the mold at this time .

When the touch panel of the rear safety door is released and the touch panel of the front safety door is pressed: as shown in Figure 3, the high-pressure control oil of the system communicates with chamber B through chamber P of the mechanical directional valve 3 of the rear door, passes through the shuttle valve 5 and connects with the chamber with detection function. The upper cavity of the cartridge valve 6 is connected, because the area of the upper cavity of the cartridge valve is larger than the area of the lower cavity, and the pressure oil presses and closes the cartridge valve 6 with detection function. When the press-fit closing action of the cartridge valve 6 is completed, the detection point of the cartridge valve 6 with the detection function provides a closing signal to the controller, and the controller cuts off the oil inlet of the system. The machine just can't carry out the mold opening and closing action at this moment like this.

When both the front safety door touch panel and the rear safety door touch panel are loose: as shown in Figure 4, the high-pressure control oil of the system communicates with cavity B through the P chamber of the mechanical directional valve 1 of the front door; the high-pressure control oil of the system passes through the mechanical directional valve of the rear door The P chamber of 3 is connected with the B chamber, and the two high-pressure control oils are connected to the upper chamber of the cartridge valve 6 with the detection function through the shuttle valve 5, because the area of the upper chamber of the cartridge valve is larger than the area of the lower chamber, the pressure oil will have the detection function The cartridge valve 6 is press closed. When the press-fitting and closing action of the cartridge valve 6 is completed, the detection point of the cartridge valve 6 with detection function provides a closing signal to the controller. Under this working condition, cut off the system oil inlet. The machine just can't carry out the mold opening and closing action at this moment like this.

When both the front safety door touch panel and the rear safety door touch panel are pressed together: as shown in Figure 1, the high-pressure control oil of the system communicates with the closed A cavity through the P cavity of the front door mechanical directional valve 1; the high-pressure control oil of the system passes through the rear door mechanical The P chamber of the directional valve 3 communicates with the closed A chamber, and the left and right chambers of the shuttle valve 5 have no high-pressure control oil. The upper cavity of the cartridge valve 6 with detection function communicates with the oil return path, and the oil inlet of the system pushes the cartridge valve 6 with detection function back open. Under normal conditions of the other equipment of the injection molding machine, the switch mode works normally.

Claims (1)

1. the hydraulic circuit for large size plastic jetting-moulding device Clamping System security control, it is characterised in that；Including Qianmen operating direction valve, back door operating direction valve, inserted valve, shuttle valve, the inserted valve of band detection function, shuttle valve is bridged between the inserted valve of Qianmen operating direction valve, back door operating direction valve and band detection function, shuttle valve stops with Qianmen operating direction valve, the Guan Bi of the inserted valve of back door operating direction valve co-controlling band detection function, the final action controlling folding mould oil cylinder.