Injection hydraulic oil way system of injection molding machine

Abstract

The utility model discloses an injection hydraulic oil path system of an injection molding machine, which comprises an oil inlet, an oil return port, a first electromagnetic valve, an injection oil inlet, an injection oil return port, a logic valve, a second electromagnetic valve and a pressure regulating valve, the logic valve is arranged between the oil return port and the first electromagnetic valve; and the second electromagnetic valve and the pressure regulating valve are respectively communicated with the logic valve. According to the injection hydraulic oil way system of the injection molding machine, when high-pressure low-speed injection is needed, the second electromagnetic valve is closed without being powered on, the logic valve is communicated with the pressure regulating valve, and the pressure regulating valve is regulated to the set required pressure, so that certain oil return back pressure is generated through the logic valve and the pressure regulating valve, and the high-pressure low-speed injection is realized through the oil return back pressure; therefore, the injection position accuracy is ensured, the product yield is improved, normal oil return or oil return back pressure generation can be achieved by controlling the second electromagnetic valve, and the selectivity during injection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to an injection hydraulic oil circuit system for an injection molding machine. Background Art

[0002] Injection molding machine, also known as injection molding machine, is the main molding equipment that uses plastic molding molds to make thermoplastics or thermosetting plastics into plastic products of various shapes. Injection molding machine is the most widely used processing machinery in the plastic processing industry. Not only can a large number of products be directly produced by injection molding machine, but it is also the key equipment for injection stretch blow molding process. Injection molding machine is usually composed of injection system, mold clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc.

[0003] However, with the rapid development of manufacturing technology and the increasing number of injection materials, injection molding machines have more requirements during the injection process, such as high-pressure and low-speed injection. However, existing injection molding machines are still unable to achieve high-pressure and low-speed injection, resulting in poor injection position accuracy when such products need to be injected, affecting the product yield. Utility Model Content

[0004] The utility model aims to provide an injection hydraulic oil circuit system for an injection molding machine which ensures accurate injection positions and improves the product yield.

[0005] In order to solve the above technical problems, the present invention can be implemented by adopting the following technical solutions:

[0006] An injection hydraulic oil circuit system for an injection molding machine comprises an oil inlet, an oil return port, a first solenoid valve, an injection oil inlet, an injection oil return port, a logic valve, a second solenoid valve and a pressure regulating valve, wherein the oil inlet, the oil return port, the injection oil inlet and the injection oil return port are respectively connected to the first solenoid valve, the logic valve is arranged between the oil return port and the first solenoid valve, and the second solenoid valve and the pressure regulating valve are respectively connected to the logic valve.

[0007] In one embodiment, the first solenoid valve has an oil port P, an oil port T, an oil port A and an oil port B, the oil inlet is connected to the oil port P, the oil return port is connected to the oil port T, the injection oil inlet is connected to the oil port A, and the injection oil return port is connected to the oil port B. During the injection process of the injection molding machine, the oil port P is connected to the oil port B to realize oil inlet, and the oil port A is connected to the oil port T to realize oil return.

[0008] In one embodiment, the logic valve is provided with a bottom hole, an upper hole and two side holes, wherein the bottom hole and the two side holes are main oil ports, and the upper hole is a control port, the oil port T of the first solenoid valve is connected to the bottom hole of the logic valve, one of the side holes of the logic valve is connected to the oil return port, the upper hole of the logic valve is connected to the second solenoid valve and one end of the pressure regulating valve, and the other end of the second solenoid valve and the pressure regulating valve is connected to the other side hole of the logic valve.

[0009] In one embodiment, the second solenoid valve and the pressure regulating valve are arranged in parallel.

[0010] In one embodiment, the logic valve is of model LCV-32.

[0011] In one embodiment, the model of the second solenoid valve is DSG-01-2B2.

[0012] In one embodiment, the model of the pressure regulating valve is RD-08. Beneficial Effects

[0013] The utility model discloses an injection hydraulic oil circuit system for an injection molding machine. During the injection process, the oil inlet, the first solenoid valve and the injection oil inlet are connected to form an injection oil inlet circuit, while the injection oil return port, the first solenoid valve and the oil return port are connected to form an injection oil return circuit. When high-pressure and low-speed injection is required, the second solenoid valve must not be electrically closed, the logic valve and the pressure regulating valve are connected, and the pressure regulating valve is adjusted to a set pressure, thereby generating a certain oil return back pressure through the logic valve and the pressure regulating valve. The oil return back pressure realizes high-pressure and low-speed injection, ensures accurate injection position, and improves the yield rate of the product. When the oil return back pressure is not needed, the second solenoid valve is energized to connect the second solenoid valve and the logic valve. In this way, normal oil return or oil return back pressure can be achieved through the control of the second solenoid valve, thereby improving the selectivity of the injection molding machine during injection and meeting the production setting requirements of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the back pressure structure of the injection hydraulic oil circuit system of the injection molding machine of the utility model;

[0015] Figure 2 It is a schematic diagram of the back pressure-free structure of the injection hydraulic oil circuit system of the injection molding machine of the utility model.

[0016] As shown in the attached figure:

[0017] 100, oil inlet; 200, oil return port; 300, first solenoid valve; 400, injection oil inlet; 500, injection oil return port; 600, logic valve; 610, bottom hole; 620, upper hole; 630, side hole; 700, second solenoid valve; 800, pressure regulating valve. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] See also Figure 1 and Figure 2 , an injection hydraulic oil circuit system for an injection molding machine, comprising an oil inlet 100, an oil return port 200, a first solenoid valve 300, an injection oil inlet 400, an injection oil return port 500, a logic valve 600, a second solenoid valve 700 and a pressure regulating valve 800, wherein the oil inlet 100, the oil return port 200, the injection oil inlet 400 and the injection oil return port 500 are respectively connected to the first solenoid valve 300, the logic valve 600 is arranged between the oil return port 200 and the first solenoid valve 300, and the second solenoid valve 700 and the pressure regulating valve 800 are respectively connected to the logic valve 600.

[0022] Specifically, in this embodiment, the oil inlet 100, the oil return port 200, the injection oil inlet 400 and the injection oil return port 500 are respectively connected to the first solenoid valve 300, wherein an injection oil inlet oil circuit is formed between the oil inlet 100, the first solenoid valve 300 and the injection oil inlet 400, and an injection oil return oil circuit is formed between the injection oil return port 500, the first solenoid valve 300 and the oil return port 200. In order to achieve high-pressure and low-speed injection, a logic valve 6 is provided between the first solenoid valve 300 and the oil return port 200. 00, and the logic valve 600 is connected to the second solenoid valve 700 and the pressure regulating valve 800 respectively. When the second solenoid valve 700 is not energized, the second solenoid valve 700 is in a closed state. At this time, the logic valve 600 is only connected to the pressure regulating valve 800. The pressure regulating valve 800 is then adjusted to the set required pressure. This pressure can form a certain back pressure in the logic valve 600, thereby forming a return oil back pressure. The return oil back pressure forms a high-pressure and low-speed injection of the injection molding machine, thereby ensuring the precise position during injection and improving the product yield.

[0023] When the second solenoid valve 700 is energized, the second solenoid valve 700 is connected to the logic valve 600. At this time, the injection oil return oil circuit is unblocked, and passes through the second solenoid valve 700 to the logic valve 600, and then from the logic valve 600 to the oil return port 200, thereby realizing normal oil return of the injection molding machine during injection. Finally, by controlling the second solenoid valve 700, return oil back pressure or no return oil back pressure can be formed, thereby improving the selectivity during injection and meeting the production setting requirements of users.

[0024] In order to realize the connection between the logic valve 600 and the second solenoid valve 700 and the pressure regulating valve 800 respectively, the second solenoid valve 700 and the pressure regulating valve 800 are arranged in parallel. Through their parallel arrangement, return oil back pressure can be formed or no return oil back pressure is required when the second solenoid valve 700 is energized or not energized.

[0025] In addition, the model of the logic valve 600 in this embodiment is LCV-32, the model of the second solenoid valve 700 is DSG-01-2B2, and the model of the pressure regulating valve 800 is RD-08. The models of each valve are commonly seen in the market and can be purchased conveniently.

[0026] See also Figure 1 or Figure 2In order to realize the control of the oil circuit by the first solenoid valve 300, the first solenoid valve 300 has an oil port P, an oil port T, an oil port A and an oil port B, wherein the oil inlet 100 is connected to the oil port P, the oil return port 200 is connected to the oil port T, the injection oil inlet 400 is connected to the oil port A, and the injection oil return port 500 is connected to the oil port B. When the injection molding machine is in the injection process, the first solenoid valve 300 is energized, so that the oil inlet 100, the oil port P of the first solenoid valve 300 and the oil port B of the first solenoid valve 300 are connected to form an injection oil inlet oil circuit, and the injection oil return port 500, the oil port A of the first solenoid valve 300 and the oil port T of the first solenoid valve 300 are connected to form an injection oil return oil circuit, and finally an injection hydraulic oil circuit is formed.

[0027] In addition, in order to realize the oil return of the injection hydraulic oil circuit and form the oil return back pressure, the logic valve 600 in this embodiment is provided with a bottom hole 610, an upper hole 620 and two side holes 630, wherein the bottom hole 610 and the two side holes 630 are main oil ports, and the upper hole 620 is a control port, the oil port T of the first solenoid valve 300 is connected to the bottom hole 610 of the logic valve 600, one of the side holes 630 of the logic valve 600 is connected to the oil return port 200, and at the same time, the upper hole 620 of the logic valve 600 is connected to the second solenoid valve 300. One end of the solenoid valve 700 and the pressure regulating valve 800 are connected, and the aperture of the upper hole 620 of the logic valve 600 is 1.2 mm. The other ends of the second solenoid valve 700 and the pressure regulating valve 800 are connected to the other side hole 630 of the logic valve 600. The return oil of the injection hydraulic oil circuit can be realized through the bottom hole 610 and the side hole 630, and the upper hole 620 is respectively connected to the second solenoid valve 700 and the pressure regulating valve 800, thereby forming a return oil back pressure, and the accuracy of the position during injection is ensured by the return oil back pressure, thereby improving the yield rate.

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Any technician in the industry can smoothly implement the utility model according to the drawings shown in the specification and the above description; however, any equivalent changes, modifications and evolutions made by any technician familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the scope of protection of the technical solution of the utility model.

Claims

1. An injection molding machine injection hydraulic oil circuit system, characterized in that: It includes an oil inlet, an oil return port, a first solenoid valve, an injection oil inlet, an injection oil return port, a logic valve, a second solenoid valve and a pressure regulating valve, wherein the oil inlet, the oil return port, the injection oil inlet and the injection oil return port are respectively connected to the first solenoid valve, the logic valve is arranged between the oil return port and the first solenoid valve, and the second solenoid valve and the pressure regulating valve are respectively connected to the logic valve.

2. The injection molding machine injection hydraulic oil circuit system according to claim 1, characterized in that: The first solenoid valve has an oil port P, an oil port T, an oil port A and an oil port B. The oil inlet is connected to the oil port P, the oil return port is connected to the oil port T, the injection oil inlet is connected to the oil port A, and the injection oil return port is connected to the oil port B. During the injection process of the injection molding machine, the oil port P is connected to the oil port B to realize oil inlet, and the oil port A is connected to the oil port T to realize oil return.

3. The injection molding machine injection hydraulic oil circuit system according to claim 2, characterized in that: The logic valve is provided with a bottom hole, an upper hole and two side holes, wherein the bottom hole and the two side holes are main oil ports, and the upper hole is a control port, the oil port T of the first solenoid valve is connected to the bottom hole of the logic valve, one of the side holes of the logic valve is connected to the oil return port, the upper hole of the logic valve is connected to the second solenoid valve and one end of the pressure regulating valve, and the other ends of the second solenoid valve and the pressure regulating valve are connected to the other side hole of the logic valve.

4. The injection molding machine injection hydraulic oil circuit system according to claim 1, characterized in that: The second solenoid valve is arranged in parallel with the pressure regulating valve.

5. The injection molding machine injection hydraulic oil circuit system according to claim 1, characterized in that: The model of the logic valve is LCV-32.

6. The injection molding machine injection hydraulic oil circuit system according to claim 1, characterized in that: The model of the second solenoid valve is DSG-01-2B2.

7. The injection molding machine injection hydraulic oil circuit system according to claim 1, characterized in that: The model of the pressure regulating valve is RD-08.

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