CN-224224467-U - Mould back pressure oil circuit opens and shuts of injection molding machine

CN224224467UCN 224224467 UCN224224467 UCN 224224467UCN-224224467-U

Abstract

The utility model discloses an opening and closing die back pressure oil way of an injection molding machine, which comprises an oil inlet line, an oil return line, an injection shifting line, an opening die oil port MO, a die closing oil port MC, a first reversing valve and a back pressure line, wherein the opening die oil port MO is connected with a working oil port B of the first reversing valve, the die closing oil port MC is connected with a working oil port A of the first reversing valve, an oil inlet P of the first reversing valve is connected with the oil inlet line, the back pressure line comprises a logic valve, a second reversing valve and a pressure control valve, the first oil port of the logic valve and the working oil port B1 of the second reversing valve are both connected with one end of the pressure control valve, the second oil port B2 of the logic valve, the oil return port T1 of the second reversing valve and the other end of the pressure control valve are connected with the oil return line together, the third oil port A2 of the logic valve and the oil inlet P1 of the second reversing valve are connected with the oil return port T of the first reversing valve together, the back pressure of the back pressure is formed in the loop, the back pressure can be eliminated through controlling the size of the back pressure, the effect of inertia can be achieved, the die opening positioning is more accurate, and the economic multipurpose purpose can be achieved.

Inventors

HU GANG
LIU HUAN
HUANG ZENAN
SHI CHUAN
YIN ZIHAO

Assignees

东莞富强鑫塑胶机械制造有限公司

Dates

Publication Date: 20260512
Application Date: 20250427

Claims (5)

1. The back pressure oil way of the mold opening and closing of the injection molding machine comprises an oil inlet line, an oil return line, a mold opening oil port MO, a mold closing oil port MC and a first reversing valve, wherein the mold opening oil port MO is connected with a working oil port B of the first reversing valve, the mold closing oil port MC is connected with the working oil port A of the first reversing valve, and an oil inlet P of the first reversing valve is connected with the oil inlet line, and the back pressure oil way is characterized in that: The hydraulic oil return device is characterized by further comprising a back pressure circuit, wherein the back pressure circuit comprises a logic valve, a second reversing valve and a pressure control valve, a first oil port of the logic valve and a working oil port B1 of the second reversing valve are both connected with one end of the pressure control valve, a second oil port B2 of the logic valve, an oil return port T1 of the second reversing valve and the other end of the pressure control valve are jointly connected with an oil return circuit, and a third oil port A2 of the logic valve and an oil inlet P1 of the second reversing valve are jointly connected with the oil return port T of the first reversing valve.
2. The back pressure oil way of the mold opening and closing of the injection molding machine according to claim 1, wherein the injection line comprises a third reversing valve, an oil inlet P2 of the third reversing valve and an oil inlet P of the first reversing valve are connected with an oil inlet line together, and an oil return port T2 of the third reversing valve is connected with an oil return line.
3. The back pressure oil path of the injection molding machine according to claim 1, wherein the working port A of the first reversing valve is connected with the mold closing port MC through a first check valve.
4. The back pressure oil way of the mold opening and closing of the injection molding machine according to claim 3, wherein the first one-way valve is connected with a logic cartridge valve in parallel, an oil port of the logic cartridge valve is connected with a proportional direction valve, a working oil port A3 of the proportional direction valve is connected with an oil port of the logic cartridge valve, an oil inlet P3 of the proportional direction valve is connected with an oil inlet line through a second one-way valve, and an oil return port T3 of the proportional direction valve is connected with an oil return line.
5. The back pressure oil path of the injection molding machine according to claim 1, wherein the first port of the logic valve, the working port B1 of the second reversing valve, and one end of the pressure control valve are connected to form an outlet for a pressure measurement point.

Description

Mould back pressure oil circuit opens and shuts of injection molding machine Technical Field The utility model relates to the technology in the field of mold opening and closing oil ways of injection molding machines, in particular to a mold opening and closing back pressure oil way of an injection molding machine. Background Injection molding machines, also known as injection molding machines or injection molding machines, are known in many factories as beer machines and injection molded products as beer pieces. It is a main forming equipment for making thermoplastic plastics or thermosetting plastics into various shaped plastic products by using plastic forming mould. The injection molding machine can be divided into a vertical type, a horizontal type and a vertical-horizontal type according to the arrangement mode of the injection device and the mold locking device. At present, due to the equipment characteristics of a vertical injection molding machine, a screw of the injection molding machine is generally vertically distributed, and due to the dead weight of parts such as the screw, an oil pressure motor for driving the screw to rotate, an oil pressure motor seat, a transmission shaft and the like, molten plastic can bear larger pressure (also called back pressure) during storage, particularly nylon, POM and other plastics with better fluidity, and the plastics can overflow from a nozzle opening or a feed inlet of a mold machine nozzle during storage, so that the raw materials are extremely wasted, the economic purpose cannot be achieved, and in addition, the mold opening and closing process is not accurately positioned due to inertia of hydraulic pressure. Therefore, a new technology is required to be developed to solve the above-mentioned problems. Disclosure of utility model In view of the above, the present utility model aims at overcoming the drawbacks of the prior art, and its main objective is to provide an open/close mold back pressure oil path of an injection molding machine, which can make the loop have back pressure, and can play a role in eliminating inertia by controlling the back pressure, so that the open mold positioning is more accurate, and the purpose of economy and multiple purposes can be achieved. In order to achieve the above purpose, the present utility model adopts the following technical scheme: the back pressure oil way of the mold opening and closing of the injection molding machine comprises an oil inlet line, an oil return line, a mold opening oil port MO, a mold closing oil port MC and a first reversing valve, wherein the mold opening oil port MO is connected with a working oil port B of the first reversing valve, the mold closing oil port MC is connected with a working oil port A of the first reversing valve, and an oil inlet P of the first reversing valve is connected with the oil inlet line; The hydraulic oil return device is characterized by further comprising a back pressure circuit, wherein the back pressure circuit comprises a logic valve, a second reversing valve and a pressure control valve, a first oil port of the logic valve and a working oil port B1 of the second reversing valve are both connected with one end of the pressure control valve, a second oil port B2 of the logic valve, an oil return port T1 of the second reversing valve and the other end of the pressure control valve are jointly connected with an oil return circuit, and a third oil port A2 of the logic valve and an oil inlet P1 of the second reversing valve are jointly connected with the oil return port T of the first reversing valve. As a preferable scheme, the injection line comprises a third reversing valve, an oil inlet P2 of the third reversing valve and an oil inlet P of the first reversing valve are connected with an oil inlet line together, and an oil return port T2 of the third reversing valve is connected with an oil return line. As a preferable scheme, the working oil port a of the first reversing valve is connected with the mold closing oil port MC through a first one-way valve. As a preferable scheme, the first one-way valve is connected with a logic cartridge valve in parallel, an oil port of the logic cartridge valve is connected with a proportional direction valve, a working oil port A3 of the proportional direction valve is connected with an oil port of the logic cartridge valve, an oil inlet P3 of the proportional direction valve is connected with an oil inlet line through a second one-way valve, and an oil return port T3 of the proportional direction valve is connected with an oil return line. As a preferable scheme, the first oil port of the logic valve, the working oil port B1 of the second reversing valve and one end of the pressure control valve are connected to form an outlet for a pressure measuring point. Compared with the prior art, the utility model has obvious advantages and beneficial effects, and in particular, the technical scheme mainly comprises the steps of arrang