High-pressure and high-speed ejection structure for injection molding machine

Abstract

The utility model provides a high-pressure and high-speed injection structure for an injection molding machine, which can avoid the loss of oil pressure on the way and improve the injection reaction speed. Comprising an ejection oil way plate and a main oil way plate, an ejection oil outlet in the ejection oil way plate is connected with an ejection oil inlet of an ejection oil cylinder, a loosening opening in the main oil way plate is connected with an ejection loosening opening of the ejection oil cylinder, and the ejection oil way plate comprises a first ejection electromagnetic valve and a second ejection electromagnetic valve. An oil path block is installed on the outer side of the ejection oil cylinder, the first ejection electromagnetic valve and the second ejection electromagnetic valve are both assembled on the outer side of the oil path block, an ejection oil inlet channel is formed in the oil path block, and an ejection oil inlet of the ejection oil cylinder is communicated with the ejection oil inlet channel. And ejection ports of the first ejection electromagnetic valve and the second ejection electromagnetic valve are connected with the ejection oil inlet channel.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, and particularly to a high-pressure and high-speed injection structure for an injection molding machine. Background Art

[0002] An injection molding machine is a commonly used plastic molding machine, mainly including an injection system, a mold clamping system, a driving system and a control system. These systems cooperate with each other to complete the molding of plastic parts. Among them, the injection mechanism is an important part of the injection system. However, the servo valve used on the control oil circuit plate of the existing injection mechanism is not fixed on the injection cylinder, but assembled on the machine oil tank. The injection cylinder is connected to the servo valve through a 1-2-meter-long oil pipe. When the oil fluid is transmitted in the oil pipe, pressure loss will occur along the way, which will affect the injection accuracy and the injection response speed. As a result, the injection speed of the traditional injection mechanism is below 120mm / s, so it can only be applicable to medium and low speeds and cannot achieve high-speed injection of materials, and thus cannot meet the production and process requirements of high-precision electronic accessories and thin-walled products. Content of the Utility Model

[0003] Aiming at the above problems, the utility model provides a high-pressure and high-speed injection structure for an injection molding machine, which can avoid the pressure loss along the way of the oil pressure and improve the injection response speed.

[0004] The utility model adopts the following technical scheme: a high-pressure and high-speed injection structure for an injection molding machine, which includes an injection oil circuit board and a main oil circuit board. The injection oil outlet on the injection oil circuit board is connected to the injection oil inlet of the injection cylinder. The retraction port on the main oil circuit board is connected to the injection retraction port of the injection cylinder. The injection oil circuit board includes a first injection solenoid valve and a second injection solenoid valve. An oil circuit block is installed outside the injection cylinder. The first injection solenoid valve and the second injection solenoid valve are both assembled outside the oil circuit block. An injection oil inlet passage is provided in the oil circuit block. The injection oil inlet of the injection cylinder is communicated with the injection oil inlet passage. The injection outlets of the first injection solenoid valve and the second injection solenoid valve are both connected to the injection oil inlet passage.

[0005] Further, the injection retraction port of the injection cylinder is divided into a first injection retraction port and a second injection retraction port. The retraction port on the main oil circuit board is divided into a first retraction port IFT and a second retraction port IB. The first retraction port IFT is connected to the first injection retraction port, and the second retraction port IB is connected to the second injection retraction port;

[0006] Further, the main oil circuit board includes an injection assist valve, a retraction solenoid valve, a plasticizing solenoid valve, a proportional back pressure valve, and a double proportional valve. The main oil circuit board also has a main injection oil outlet IFP, an oil motor inlet SP, an oil motor return port ST, a fuel pump inlet P, and a fuel tank inlet T. The retraction solenoid valve and the plasticizing solenoid valve both adopt two-position four-way valves. The three working ports of the double proportional valve are respectively connected to the main injection oil outlet IFP, the oil motor return port ST, and the fuel pump inlet P. The two working ports of the injection assist valve are correspondingly connected to the second retraction port IB and the fuel tank inlet T. Two of the working ports of the retraction solenoid valve are correspondingly connected to the first retraction port IFT and the second retraction port IB. The other two working ports of the retraction solenoid valve are correspondingly connected to the main injection oil outlet IFP and the fuel tank inlet T. Two of the working ports of the plasticizing solenoid valve are correspondingly connected to the first retraction port IFT and the oil motor inlet SP. The other two working ports of the plasticizing solenoid valve are correspondingly connected to the main injection oil outlet IFP and one working port of the proportional back pressure valve. The other working port of the proportional back pressure valve is connected to the fuel tank inlet T;

[0007] Further, the injection cylinder is installed between the upper cover and the lower cover. A connecting rod is connected between the upper cover and the lower cover. The oil circuit block is connected to the upper cover.

[0008] The beneficial effect of the present utility model is that the first injection solenoid valve and the second injection solenoid valve are provided on the injection oil circuit board, and the injection oil circuit board is assembled on the injection cylinder, thereby reducing the pressure and flow loss of the oil circuit in the pipeline, facilitating high-pressure and high-speed injection, and improving the injection response speed, having good economic use value. Description of the Drawings

[0009] Figure 1 is the assembly structure schematic diagram of the present utility model;

[0010] Figure 2 is the cross-sectional view of the present utility model;

[0011] Figure 3 is the oil circuit schematic diagram of the present utility model. Detailed Embodiments

[0012] Such as Figure 1 、 Figure 2 、 Figure 3As shown in the figure, a high-pressure and high-speed injection structure for an injection molding machine according to the present utility model includes an injection oil circuit board 1 and a main oil circuit board 2. The injection oil outlet IF on the injection oil circuit board 1 is connected to the injection oil inlet 12 of the injection cylinder 3, and the retraction port on the main oil circuit board 2 is connected to the injection retraction port of the injection cylinder 3. The injection oil circuit board 1 includes a first injection solenoid valve S1 and a second injection solenoid valve S2. An oil circuit block 4 is installed outside the injection cylinder 3. The first injection solenoid valve S1 and the second injection solenoid valve S2 are both assembled outside the oil circuit block 4. An injection oil inlet passage 5 is provided inside the oil circuit block 4. The injection oil inlet 12 of the injection cylinder 3 is communicated with the injection oil inlet passage 5. The injection outlets of the first injection solenoid valve S1 and the second injection solenoid valve S2 are both connected to the injection oil inlet passage 5. The main oil circuit board 2 is fixed on the fuel tank (not shown in the figure) of the injection molding machine. The injection oil circuit board 1 also has an injection oil outlet IFP1, that is, both the first injection solenoid valve S1 and the second injection solenoid valve S2 are connected between the injection oil inlet IF and the injection oil outlet IFP1, and the injection oil outlet IFP1 is communicated with the main injection oil outlet IFP.

[0013] The injection retraction ports of the injection cylinder 3 are divided into a first injection retraction port 10 and a second injection retraction port 11. The retraction ports on the main oil circuit board 2 are divided into a first retraction port IFT and a second retraction port IB. The first retraction port IFT is connected to the first injection retraction port 10, and the second retraction port IB is connected to the second injection retraction port 11. The main oil circuit board 2 includes an injection auxiliary valve S3, a retraction solenoid valve S4, a plasticizing solenoid valve S5, a proportional back pressure valve S6, and a double proportional valve S7. The main oil circuit board 2 also has a main injection oil outlet IFP, an oil motor oil inlet SP, an oil motor oil return port ST, a pump oil inlet P, and a fuel tank inlet T (for returning oil to the fuel tank of the injection molding machine). The retraction solenoid valve S4 and the plasticizing solenoid valve S5 both adopt two-position four-way valves. The three working ports of the double proportional valve S7 are respectively connected to the main injection oil outlet IFP, the oil motor oil return port ST, and the pump oil inlet P. The two working ports of the injection auxiliary valve S3 are correspondingly connected to the second retraction port IB and the fuel tank inlet T. Two of the working ports of the retraction solenoid valve S4 are correspondingly connected to the first retraction port IFT and the second retraction port IB, and the other two working ports of the retraction solenoid valve S4 are correspondingly connected to the main injection oil outlet IFP and the fuel tank inlet T. Two of the working ports of the plasticizing solenoid valve S5 are correspondingly connected to the first retraction port IFT and the oil motor oil inlet SP, and the other two working ports of the plasticizing solenoid valve S5 are correspondingly connected to the main injection oil outlet IFP and one working port of the proportional back pressure valve S6. The other working port of the proportional back pressure valve S6 is connected to the fuel tank inlet T.

[0014] The injection cylinder 3 is installed between the upper cover 6 and the lower cover 7. A connecting rod 13 is connected between the upper cover 6 and the lower cover 7. The oil circuit block 4 is connected to the upper cover 6.

[0015] The working principle of the present utility model is:

[0016] When the injection cylinder 3 performs the injection action, the first injection solenoid valve S1, the second injection solenoid valve S2, and the injection auxiliary valve S3 are all energized, and the retreat solenoid valve S4 and the plasticizing solenoid valve S5 are both de-energized;

[0017] When the injection cylinder 3 performs the retreat action, the first injection solenoid valve S1, the second injection solenoid valve S2, the injection auxiliary valve S3, and the plasticizing solenoid valve S5 are all de-energized, and the retreat solenoid valve S4 is energized;

[0018] When the plasticizing action is performed, the first injection solenoid valve S1, the second injection solenoid valve S2, the injection auxiliary valve S3, and the retreat solenoid valve S4 are all de-energized, and the plasticizing solenoid valve S5 is energized;

[0019] When performing different actions, the first injection solenoid valve S1, the second injection solenoid valve S2, the injection auxiliary valve S3, the retreat solenoid valve S4, and the plasticizing solenoid valve S5 are energized or de-energized according to the above actions. It should be noted that the proportional back pressure valve S6 and the double proportional valve S7 are preset according to the situation. When the injection cylinder 3 operates, the double proportional valve S7 will be automatically energized and operate according to the preset ratio. The proportional back pressure valve S6 is only energized during the retreat or plasticizing action.

[0020] The utility model does not need to purchase imported servo valves at high cost, but uses ordinary solenoid valves purchased at low cost, which can also achieve the effects of high pressure and high speed, thus reducing the production costs of the factory and customers; specifically, controlled by the first injection solenoid valve S1 and the second injection solenoid valve S2, it reduces the pressure and flow loss of the oil circuit in the pipeline, and is easier to achieve high pressure and high speed. When the first injection solenoid valve S1 and the second injection solenoid valve S2 are energized simultaneously, a large flow of oil can pass through the first injection solenoid valve S1 and the second injection solenoid valve S2 and enter the injection cavity of the injection cylinder 3, thus realizing the function of high speed; during injection, the oil return of the retreat cavity of the injection cylinder 3 is controlled separately by the injection auxiliary valve S3. The injection auxiliary valve S3 has the characteristics of fast response and large oil passing capacity, thus avoiding the back pressure generated by the oil circuit of the retreat cavity during injection, and ensuring the synchronism of the electromagnetic response time and the response time of the injection solenoid valve. Moreover, the retreat of the injection cylinder 3 is controlled by a separate retreat solenoid valve S4, which is easier to control the accuracy of the retreat distance of the injection cylinder 3; during plasticizing, the oil return of the injection cavity 8 of the injection cylinder 3 passes through the proportional back pressure valve S6, and the retreat cavity 9 of the injection cylinder 3 automatically sucks oil through the injection auxiliary valve S3, thus improving the accuracy of the rising distance of the injection piston rod of the injection cylinder 3 and making the plasticizing density and position more precise; in summary, the utility model can achieve a high pressure of 280 Mpa and a high speed of 400 mm / s, and is applicable to the production of some thin-walled plastic products such as precision electronic accessories and mobile phone accessories.

[0021] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0022] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-pressure and high-speed injection structure for an injection molding machine, characterized in that: It includes an injection oil circuit board and a main oil circuit board. The injection oil outlet on the injection oil circuit board is connected to the injection oil inlet of the injection oil cylinder. The release port on the main oil circuit board is connected to the injection release port of the injection oil cylinder. The injection oil circuit board includes a first injection solenoid valve and a second injection solenoid valve. An oil circuit block is installed on the outer side of the injection oil cylinder. The first injection solenoid valve and the second injection solenoid valve are both assembled on the outer side of the oil circuit block. An injection oil inlet channel is arranged in the oil circuit block. The injection oil inlet of the injection oil cylinder is communicated with the injection oil inlet channel. The injection ports of the first injection solenoid valve and the second injection solenoid valve are both connected to the injection oil inlet channel.

2. The high-pressure and high-speed injection structure for an injection molding machine according to claim 1, characterized in that: The shooting release port of the shooting oil cylinder is divided into a first shooting release port and a second shooting release port, and the release port on the main oil circuit board is divided into a first release port IFT and a second release port IB. The first release port IFT is connected to the first shooting release port, and the second release port IB is connected to the second shooting release port.

3. The high-pressure and high-speed injection structure for an injection molding machine according to claim 2, characterized in that: The main oil circuit board includes an injection auxiliary valve, a release and retraction solenoid valve, a material storage solenoid valve, a proportional back pressure valve, and a dual proportional valve. The main oil circuit board also has a main injection oil port IFP, an oil motor oil inlet SP, an oil motor return oil port ST, an oil pump oil inlet P, and an oil tank inlet T. The release and retraction solenoid valve and the material storage solenoid valve both use a two-position four-way valve. The three working ports of the dual proportional valve are respectively connected to the main injection oil port IFP, the oil motor return oil port ST, and the oil pump oil inlet P. The two working ports of the injection auxiliary valve are respectively connected to the second release and retraction port IB and the oil tank inlet. Port T, two of the working ports of the release solenoid valve are correspondingly connected to the first release port IFT and the second release port IB, the other two working ports of the release solenoid valve are correspondingly connected to the main injection oil port IFP and the tank inlet T, two of the working ports of the storage solenoid valve are correspondingly connected to the first release port IFT and the oil motor inlet SP, the other two working ports of the storage solenoid valve are correspondingly connected to the main injection oil port IFP and a working port of the proportional back pressure valve, and the other working port of the proportional back pressure valve is connected to the tank inlet T.

4. The high-pressure and high-speed injection structure for an injection molding machine according to claim 1, characterized in that: The shooting oil cylinder is installed between the upper cover and the lower cover, a connecting rod is connected between the upper cover and the lower cover, and the oil passage block is connected to the upper cover.

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