Electric pre-molding oil supplementing and cooling system of large injection molding machine

Abstract

The utility model relates to the technical field of electric pre-molding oil recharging of injection molding machines, and particularly discloses an electric pre-molding oil recharging cooling system of a large injection molding machine, which comprises an oil recharging motor, an oil recharging pump, an electromagnetic relief valve and an oil tank, the oil supplementing pump supplements oil to the injection and retreat cavity of the injection oil cylinder through the electromagnetic overflow valve, in the injection and retreat stage of the injection molding machine, the oil supplementing pump pumps hydraulic oil in the oil tank to supplement oil to the injection cavity of the injection oil cylinder, it is guaranteed that the material storage and injection actions are conducted smoothly, and when an oil supplementing system does not need to be used for oil supplementing, the oil supplementing pump can pump out the hydraulic oil in the oil tank; and the hydraulic oil sequentially passes through the electromagnetic relief valve and the cooler to cool the hydraulic oil in the oil tank.

Description

Technical Field

[0001] The utility model relates to the technical field of electric pre-plasticizing oil replenishment, in particular to an electric pre-plasticizing oil replenishment cooling system for a large injection molding machine. Background Art

[0002] The double-cylinder injection structure is a commonly used injection structure for injection molding machines. The rod chamber of the injection cylinder of this structure is the injection chamber, and the rodless chamber of the cylinder is the ejection chamber. When the material storage action is performed, the injection cylinder piston is driven to retreat synchronously as the pressing screw retreats. At this time, the rod chamber of the injection cylinder will retreat to discharge oil, and the rodless chamber needs to be replenished with oil. However, due to the area ratio, the oil coming out of the rod chamber is not enough to replenish the oil required by the rodless chamber, especially when the injection molding machine adopts an electric pre-plasticizing device. Because the hydraulic pre-plasticizing device cannot use the hydraulic motor to return oil as a supplement for the lack of oil during the pre-plasticizing action, the material storage action cannot be performed normally. Summary of the invention

[0003] The utility model is made in consideration of the above-mentioned problems, and the purpose of the utility model is to provide an electric pre-plasticizing oil replenishing cooling system for a large injection molding machine, which can realize the oil replenishment of the injection system in the material storage state and reduce the oil temperature at the same time.

[0004] To achieve the above-mentioned purpose, the utility model provides an electric pre-plasticizing oil replenishment cooling system for a large injection molding machine, wherein the injection molding machine is also provided with a mold opening and closing system and an injection system, wherein the injection system comprises an injection oil cylinder and an oil return pipeline, wherein the oil return pipeline is communicated with the ejection cavity of the injection oil cylinder, wherein the electric pre-plasticizing oil replenishment cooling system comprises an oil replenishment motor, an oil replenishment pump, an electromagnetic overflow valve and an oil tank, wherein the output shaft of the oil replenishment motor is connected with the oil replenishment pump, the oil inlet of the oil replenishment pump is communicated with the oil tank, and the oil outlet of the oil replenishment pump is communicated with the oil inlet of the electromagnetic overflow valve, and the oil outlet of the electromagnetic overflow valve is communicated with the oil inlet of the oil return pipeline;

[0005] The electromagnetic overflow valve is provided with a first electromagnet. When the first electromagnet is energized, the electromagnetic overflow valve opens; when the first electromagnet is de-energized, the electromagnetic overflow valve closes.

[0006] According to the above-mentioned large-scale injection molding machine electric pre-plasticizing oil replenishment cooling system, it also includes a one-way valve, which is located between the oil replenishment pump and the injection chamber of the injection cylinder, the oil inlet of the one-way valve is connected to the oil outlet of the oil replenishment pump, and the oil outlet of the one-way valve is connected to the injection chamber of the injection cylinder.

[0007] According to the above-mentioned large-scale injection molding machine electric pre-plasticizing oil replenishment cooling system, it also includes a first cartridge valve, the oil inlet of the first cartridge valve is connected to the oil outlet of the electromagnetic overflow valve and the return oil pipeline at the same time, and the oil outlet of the first cartridge valve is connected to the oil inlet of the oil tank.

[0008] According to the above-mentioned large-scale injection molding machine electric pre-plasticizing oil replenishment cooling system, it also includes a cooler, which is located between the first cartridge valve and the oil tank, the oil inlet of the cooler is connected to the oil outlet of the first cartridge valve, and the oil outlet of the cooler is connected to the oil inlet of the oil tank.

[0009] According to the above-mentioned electric pre-plasticizing oil replenishing cooling system for a large injection molding machine, a second cartridge valve is provided between the opening and closing mold system and the injection system, a pilot valve is provided on one side of the second cartridge valve, and a second electromagnet is provided on the pilot valve. When the second electromagnet is energized, the pilot valve can control the second cartridge valve to close, so as to cut off the opening and closing mold system and the injection system.

[0010] The utility model has the following beneficial effects:

[0011] 1. In the material storage stage, the first electromagnet can be controlled to be energized. At this time, the oil pumped by the oil replenishment pump can enter the oil return pipeline through the electromagnetic overflow valve. Since the oil return pipeline is connected to the ejection cavity of the injection cylinder, when the ejection cavity is vacuum, the hydraulic oil in the oil return pipeline will be sucked in, so as to realize the oil replenishment in the material storage process and ensure the normal operation of the material storage work;

[0012] 2. When the oil replenishment system is not needed, the oil replenishment pump can extract the hydraulic oil in the oil tank and pass it through the electromagnetic overflow valve and the cooler in turn to cool the hydraulic oil in the oil tank;

[0013] 3. A second cartridge valve is provided between the mold opening and closing system and the injection system, and the mold opening and closing system and the injection system can be cut off by the second cartridge valve. When the material storage is completed and the injection and withdrawal action is required, the mold opening and closing system and the injection system can be cut off, and the synchronous action of door opening and injection and withdrawal can be realized, thereby shortening the cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the overall oil circuit of the embodiment.

[0015] In the figure:

[0016] 1. Oil replenishment motor; 2. Oil replenishment pump; 3. Electromagnetic overflow valve; 4. Oil tank; 5. First electromagnet; 6. Check valve; 7. First cartridge valve; 8. Cooler; 9. Second cartridge valve; 10. Pilot valve; 11. Second electromagnet; 12. Mold opening and closing system; 13. Injection system; 14. Oil return pipeline. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 1 As shown, a large-scale injection molding machine electric pre-plastic oil replenishment cooling system includes an oil replenishment motor 1, an oil replenishment pump 2, an electromagnetic overflow valve 3 and an oil tank 4. The oil replenishment motor 1 is used to provide power for the oil replenishment pump 2. In the material storage stage of the injection molding machine, the oil replenishment pump 2 replenishes oil to the ejection cavity of the injection cylinder through the electromagnetic overflow valve 3. In the ejection stage of the injection molding machine, the oil replenishment pump 2 draws hydraulic oil in the oil tank 4 to replenish oil to the injection cavity of the injection cylinder, thereby ensuring smooth material storage and injection actions.

[0019] In this embodiment, the injection molding machine is also provided with a mold opening and closing system 12 and an injection system 13. The injection system 13 includes an injection cylinder and an oil return pipe 14. The oil return pipe 14 is connected to the ejection cavity of the injection cylinder. The electric pre-plasticizing oil replenishment cooling system also includes a one-way valve 6. The one-way valve 6 is located at the oil replenishment pump 2 and the output shaft of the oil replenishment motor 1 is connected to the oil replenishment pump 2 to drive the oil replenishment pump 2 to work. The oil inlet of the oil replenishment pump 2 is connected to the oil tank 4 to extract the hydraulic oil in the oil tank 4, and the oil outlet of the oil replenishment pump 2 is simultaneously connected to the electromagnetic overflow valve 3 and the oil inlet of the one-way valve 6. The oil outlet of the electromagnetic overflow valve 3 is connected to the oil inlet of the return pipe 14, and the oil outlet of the one-way valve 6 is connected to the injection cavity of the injection cylinder, and the electromagnetic overflow valve 3 is provided with a first electromagnet 5 to The electromagnetic overflow valve 3 is controlled to be opened or closed. In the material storage stage, the injection chamber is drained and the ejection chamber needs to be replenished with oil. The first electromagnet 5 is energized and the electromagnetic overflow valve 3 is opened. At this time, due to the high pressure in the injection chamber, the hydraulic oil drawn by the oil replenishment pump 2 cannot enter the injection chamber through the one-way valve 6, and can only enter the return oil pipe 14 through the electromagnetic overflow valve 3. The existence of the one-way valve 6 prevents the hydraulic oil in the injection chamber from flowing back into the oil replenishment pump 2. Since the ejection chamber needs to be replenished with oil, there will be a vacuum, and the hydraulic oil in the return oil pipe 14 will be actively sucked in. In the ejection stage, the injection chamber needs to be replenished with oil and the ejection chamber needs to be drained. At this time, the first electromagnet 5 is controlled to lose power, the electromagnetic overflow valve 3 is closed, and the hydraulic oil drawn by the oil replenishment pump 2 enters the injection chamber through the one-way valve 6.

[0020] In order to fully replenish the oil during the storage stage, a first cartridge valve 7 is provided on one side of the connecting pipe between the electromagnetic overflow valve 3 and the oil return pipe 14. The oil inlet of the first cartridge valve 7 is connected with the oil outlet of the electromagnetic overflow valve 3 and the oil return pipe 14 at the same time, and the oil outlet of the first cartridge valve 7 is connected with the oil inlet of the oil tank 4. During the storage stage, the first cartridge valve 7 can provide back pressure to ensure that the ejection chamber is fully replenished with oil. At the same time, it can also play a protective role in case the pressure in the ejection chamber is too high.

[0021] In order to cool the hydraulic oil, a cooler 8 is also included. The cooler 8 is located between the first cartridge valve 7 and the oil tank 4. The oil inlet of the cooler 8 is connected to the oil outlet of the first cartridge valve 7, and the oil outlet of the cooler 8 is connected to the oil inlet of the oil tank 4. When there is no need to use the electromagnetic overflow valve 3 to return the oil, the hydraulic oil in the oil tank 4 can be circulated and cooled by the cooler 8 to achieve the effect of lowering the oil temperature.

[0022] In order to improve the injection molding efficiency and shorten the molding cycle, a second cartridge valve 9 is provided between the mold opening and closing system 12 and the injection system 13, and a pilot valve 10 is provided on one side of the second cartridge valve 9. A second electromagnet 11 is provided on the pilot valve 10. When the second electromagnet 11 is energized, the pilot valve 10 can control the second cartridge valve 9 to close, so as to cut off the mold opening and closing system 12 and the injection system 13. During the ejection and withdrawal action, it is only necessary to cut off the mold opening and closing system 12 and the injection system 13, so that the ejection and withdrawal action and the mold opening and closing action can be performed synchronously, thereby achieving the purpose of shortening the cycle and improving the injection molding efficiency.

[0023] The technical solution of the utility model is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the idea of ​​the utility model. The specific embodiments described herein are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but this will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A large-scale injection molding machine electric pre-plastic oil replenishment cooling system, the injection molding machine is also provided with a mold opening and closing system and an injection system, the injection system includes an injection cylinder and an oil return pipeline, the oil return pipeline is connected to the ejection cavity of the injection cylinder, characterized in that: The electric pre-plasticizing oil replenishment cooling system comprises an oil replenishment motor, an oil replenishment pump, an electromagnetic overflow valve and an oil tank, wherein the output shaft of the oil replenishment motor is connected to the oil replenishment pump, the oil inlet of the oil replenishment pump is connected to the oil tank, and the oil outlet of the oil replenishment pump is connected to the oil inlet of the electromagnetic overflow valve, and the oil outlet of the electromagnetic overflow valve is connected to the oil inlet of the oil return pipeline; The electromagnetic overflow valve is provided with a first electromagnet. When the first electromagnet is energized, the electromagnetic overflow valve opens; when the first electromagnet is de-energized, the electromagnetic overflow valve closes.

2. According to claim 1, a large-scale injection molding machine electric pre-plastic oil supply cooling system is characterized in that: It also includes a one-way valve, which is located between the oil replenishing pump and the injection chamber of the injection cylinder, the oil inlet of the one-way valve is connected to the oil outlet of the oil replenishing pump, and the oil outlet of the one-way valve is connected to the injection chamber of the injection cylinder.

3. The large-scale injection molding machine electric pre-plasticizing oil supply cooling system according to claim 1 is characterized in that: It also includes a first cartridge valve, the oil inlet of the first cartridge valve is connected to the oil outlet of the electromagnetic overflow valve and the oil return pipeline at the same time, and the oil outlet of the first cartridge valve is connected to the oil inlet of the oil tank.

4. A large-scale injection molding machine electric pre-plastic oil supply cooling system according to claim 3, characterized in that: It also includes a cooler, which is located between the first cartridge valve and the oil tank, the oil inlet of the cooler is connected to the oil outlet of the first cartridge valve, and the oil outlet of the cooler is connected to the oil inlet of the oil tank.

5. The large-scale injection molding machine electric pre-plasticizing oil supply cooling system according to claim 1 is characterized in that: A second cartridge valve is provided between the mold opening and closing system and the injection system, a pilot valve is provided on one side of the second cartridge valve, and a second electromagnet is provided on the pilot valve. When the second electromagnet is energized, the pilot valve can control the second cartridge valve to close to cut off the mold opening and closing system and the injection system.

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