Electric pre-plasticizing control system capable of preheating oil temperature

Abstract

The utility model relates to the technical field of electric pre-plasticizing control systems, and particularly discloses an electric pre-plasticizing control system capable of preheating oil temperature, which comprises a system oil way and an oil supplementing oil way, the system oil way comprises an oil tank, a power unit, a first electromagnetic directional valve and an injection oil cylinder, and the power unit can supply oil to the injection oil cylinder through the first electromagnetic directional valve. The oil supplementing oil way comprises a first overflow valve, a second overflow valve, a third overflow valve and a second electromagnetic reversing valve, when a first electromagnet of the second electromagnetic reversing valve is powered on, overflow action can be conducted through the second overflow valve, so that the temperature of oil is increased, preheating is achieved, and when a second electromagnet of the second electromagnetic reversing valve is powered on, overflow action can be conducted through the third overflow valve. When the injection oil cylinder is in a material storage state, overflow can be conducted through the third overflow valve, oil is supplemented to the rodless cavity of the injection oil cylinder, the oil supplementing device is suitable for the injection oil cylinder in the material storage state, the requirement for oil supplementing is met, the requirement for preheating oil can also be met, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of electric pre-plasticization control systems, in particular to an electric pre-plasticization control system capable of preheating oil temperature. Background Art

[0002] During the electric pre-plasticizing process, the oil temperature needs to be adjusted, and most of the time the oil needs to be heated. In this field, the oil is usually preheated through an overflow valve, and the oil flow rate is accelerated by overflow, thereby increasing the oil temperature of the hydraulic oil. However, a conventional overflow valve needs to play the role of oil replenishment, and a single overflow valve cannot play the role of preheating and oil replenishment at the same time. Therefore, in order to enable the overflow valve to play the role of preheating, an oil replenishment motor is usually added, and oil is replenished into the rodless cavity of the injection cylinder through the oil replenishment motor, and the overflow valve is only used for oil preheating. However, adding an oil replenishment motor will lead to a significant increase in the overall cost, and the overall volume occupied by the control system is also larger. Summary of the invention

[0003] The utility model is made in consideration of the above-mentioned problems. The purpose of the utility model is to provide an electric pre-plasticization control system capable of oil temperature preheating, by adding a second overflow valve. The second overflow valve and the third overflow valve can be controlled by the second electromagnetic reversing valve, thereby realizing the switching of overflow heating and oil replenishment functions, and the cost is low, and the newly added second overflow valve occupies a smaller volume.

[0004] To achieve the above-mentioned purpose, the utility model provides an electric pre-plasticization control system capable of oil temperature preheating, comprising a system oil circuit and an oil replenishment oil circuit, wherein the system oil circuit comprises an oil tank, a power unit, a first electromagnetic reversing valve and an injection oil cylinder, wherein the oil inlet of the power unit is connected to the oil tank, and can be connected to the oil inlet of a rod chamber or a rodless chamber of the injection oil cylinder through the first electromagnetic reversing valve, and the oil outlet of the rod chamber or the rodless chamber of the injection oil cylinder can be connected to the oil tank through the first electromagnetic reversing valve;

[0005] The oil replenishment circuit includes a first relief valve, a second relief valve, a third relief valve, a second electromagnetic reversing valve and a back pressure valve, the oil inlet of the back pressure valve is connected to the rodless chamber of the injection cylinder through a first pipeline, and the oil outlet of the back pressure valve is connected to the oil tank;

[0006] The first overflow valve has a first flow channel and a second flow channel connected to an oil inlet, the oil inlet of the first overflow valve is connected to an oil outlet of the power unit, the oil outlet of the first flow channel is connected to the first pipeline, and the oil outlet of the second flow channel is connected to an oil inlet of the second electromagnetic reversing valve, wherein the first flow channel has a first opening pressure;

[0007] The second electromagnetic reversing valve comprises a first electromagnet, a second electromagnet, a first oil outlet and a second oil outlet, the first oil outlet is communicated with the oil inlet of the second relief valve, the oil outlet of the second relief valve is communicated with the first pipeline, the second oil outlet is communicated with the oil inlet of the third relief valve, and the oil outlet of the third relief valve is communicated with the first pipeline;

[0008] When the injection cylinder is in a material storage state, the second electromagnet is energized, the oil inlet of the second electromagnetic reversing valve is connected with the second oil outlet, and can be connected with the rodless chamber of the injection cylinder through the third relief valve, so as to replenish oil for the rodless chamber of the injection cylinder;

[0009] When the first electromagnet is energized, the oil inlet of the second electromagnetic reversing valve is communicated with the first oil outlet, and can overflow through the second overflow valve to increase the temperature of the oil.

[0010] According to the above-mentioned electric pre-plasticization control system capable of oil temperature preheating, the second relief valve has a second opening pressure, the third relief valve has a third opening pressure, the first opening pressure is greater than the second opening pressure, and the second opening pressure is greater than the third opening pressure.

[0011] According to the above-mentioned electric pre-plasticization control system capable of performing oil temperature preheating, the back pressure valve has a fourth opening pressure, the fourth opening pressure is less than the second opening pressure, and the fourth opening pressure is greater than the third opening pressure.

[0012] According to the electric pre-plasticization control system capable of oil temperature preheating described above, the first electromagnetic reversing valve is provided with a third oil inlet, a first variable oil port, a second variable oil port and a third variable oil port, the third oil inlet is communicated with the oil outlet of the power unit, the third variable oil port is communicated with the first pipeline, the first variable oil port is communicated with the rod chamber of the injection cylinder, and the second variable oil port is communicated with the rodless chamber of the injection cylinder;

[0013] When the third oil inlet is communicated with the first variable oil port, the third variable oil port is communicated with the second variable oil port; when the third oil inlet is communicated with the second variable oil port, the third variable oil port is communicated with the first variable oil port.

[0014] According to the above-mentioned electric pre-plasticization control system capable of preheating oil temperature, the power unit includes a motor and a hydraulic pump, the motor is used to provide power for the hydraulic pump, the oil inlet of the hydraulic pump is connected to the oil tank through a second pipe, and an oil filter is provided on one end of the second pipe located in the oil tank.

[0015] According to the above-mentioned electric pre-plasticization control system capable of preheating oil temperature, the system oil circuit also includes a cooler, a liquid level gauge and an air filter, the cooler is located between the back pressure valve and the oil tank, the liquid level gauge is located in the oil tank, and the air filter is installed at the ventilation port of the oil tank.

[0016] The utility model has the following beneficial effects:

[0017] 1. When the first electromagnet of the second electromagnetic reversing valve is energized, the oil inlet of the second electromagnetic reversing valve is connected with the first oil outlet. At this time, the second overflow valve can be used to perform overflow action to increase the temperature of the oil and achieve preheating. When the second electromagnet of the second electromagnetic reversing valve is energized, the oil inlet of the second electromagnetic reversing valve is connected with the second oil outlet. At this time, the third overflow valve can be used to overflow and the rodless chamber of the injection cylinder is replenished with oil. This is suitable for the injection cylinder in a material storage state, which can meet the needs of oil replenishment and preheating of the oil temperature, and has a low cost;

[0018] 2. The back pressure valve can provide a certain amount of oil replenishment back pressure, and the oil replenishment is smoother when the oil is replenished through the third relief valve;

[0019] 3. When the power unit absorbs oil, the oil is filtered through the oil filter to prevent large-diameter debris from entering the power unit and increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall oil circuit of the embodiment.

[0021] In the figure:

[0022] 1. Oil tank; 2. Motor; 3. Hydraulic pump; 4. First solenoid reversing valve; 5. Injection cylinder; 6. First overflow valve; 7. Second overflow valve; 8. Third overflow valve; 9. Second solenoid reversing valve; 10. First electromagnet; 11. Second electromagnet; 12. Back pressure valve; 13. Filter; 14. Cooler; 15. Liquid level gauge; 16. Air filter. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1 As shown, an electric pre-plasticization control system capable of preheating oil temperature includes a system oil circuit and an oil replenishment oil circuit. The system oil circuit is used for electric pre-plasticization drive, and the oil replenishment oil circuit is used to replenish oil for the system oil circuit and preheat the oil temperature.

[0025] Specifically, the system oil circuit includes an oil tank 1, a power unit, a first electromagnetic reversing valve 4 and an injection cylinder 5. The oil inlet of the power unit is connected to the oil tank 1, and can be connected to the oil inlet of the rod chamber or the rodless chamber of the injection cylinder 5 through the first electromagnetic reversing valve 4. The oil outlet of the rod chamber or the rodless chamber of the injection cylinder 5 can be connected to the oil tank 1 through the first electromagnetic reversing valve 4. A piston rod is provided in the injection cylinder 5, and the piston rod is a push screw. When the injection cylinder 5 is in the injection state, the power unit draws the hydraulic oil in the oil tank 1, and passes the hydraulic oil into the rodless chamber of the injection cylinder 5 through the first electromagnetic reversing valve 4, driving the push screw to move forward. In this process, the oil in the rod chamber of the injection cylinder 5 The hydraulic oil can be discharged into the oil tank 1 through the first electromagnetic reversing valve 4. When the injection cylinder 5 is in the retracting state, the power unit introduces hydraulic oil into the rod chamber of the injection cylinder 5 through the first electromagnetic reversing valve 4, driving the pushing screw to move backward. In this process, the hydraulic oil in the rodless chamber of the injection cylinder 5 can be discharged into the oil tank 1 through the first electromagnetic reversing valve 4. When the injection cylinder 5 is in the material storage state, the first electromagnetic reversing valve 4 is powered off, and the power unit cannot supply oil to the injection cylinder 5 through the first electromagnetic reversing valve 4, thereby avoiding driving the pushing screw to move. However, in this process, it is necessary to replenish oil in the rodless chamber of the injection cylinder 5 to prevent it from pulling a vacuum. Therefore, oil replenishment can be carried out through the oil replenishing circuit.

[0026] Specifically, the oil replenishment circuit includes a first relief valve 6, a second relief valve 7, a third relief valve 8, a second electromagnetic reversing valve 9 and a back pressure valve 12. The oil inlet of the back pressure valve 12 is connected to the rodless chamber of the injection cylinder 5 through a first pipeline, and the oil outlet of the back pressure valve 12 is connected to the oil tank 1. The back pressure valve 12 is set as a pressure cartridge valve, which is used to provide back pressure for the rodless chamber of the injection cylinder 5. Among them, the first relief valve 6 has a first flow channel and a second flow channel connected to the oil inlet, and the oil inlet of the electromagnetic relief valve is connected to the oil outlet of the power unit. The oil outlet of the first flow channel is connected to the first pipeline, the oil outlet of the second flow channel is connected to the oil inlet of the second electromagnetic reversing valve 9, and the first flow channel has a first opening pressure. The second electromagnetic reversing valve 9 has a first electromagnet 10, a second electromagnet 11, a first oil outlet and a second oil outlet. The first oil outlet is connected to the oil inlet of the second overflow valve 7, the oil outlet of the second overflow valve 7 is connected to the first pipeline, the second oil outlet is connected to the oil inlet of the third overflow valve 8, and the oil outlet of the third overflow valve 8 is connected to the first pipeline.

[0027] When the first electromagnetic reversing valve 4 is in the normal energized working state, that is, when the injection cylinder 5 is in the injection or ejection state, the power unit normally supplies oil to the rod chamber or rodless chamber of the injection cylinder 5 through the first electromagnetic reversing valve 4; if the pressure is too large and exceeds the safety threshold, the pressure can be relieved through the first relief valve 6. When the pressure is greater than the first opening pressure, the first flow channel can be opened to relieve the pressure through the first flow channel; if the oil temperature needs to be preheated during the normal operation of the power unit, the first electromagnet 10 can be controlled to be energized, and the oil inlet of the second electromagnetic reversing valve 9 is connected to the first oil outlet, and can overflow through the second relief valve 7 to increase the temperature of the oil to achieve preheating of the oil; and when the injection cylinder 5 is in In the material storage state, the first solenoid reversing valve 4 is powered off, and the power unit cannot pass hydraulic oil to the injection cylinder 5 through the first solenoid reversing valve 4. At that time, the second electromagnet 11 of the second solenoid reversing valve 9 is energized, and the oil inlet of the second solenoid reversing valve 9 is connected with the second oil outlet, and can be connected with the rodless chamber of the injection cylinder 5 through the third overflow valve 8. The rodless chamber of the injection cylinder 5 can be replenished with oil through the third overflow valve 8, thereby preventing the injection cylinder 5 from pulling a vacuum when moving. Therefore, in this embodiment, the oil can be preheated through the second overflow valve 7, and the rodless chamber of the injection cylinder 5 can be replenished with oil through the third overflow valve 8, which not only meets the functional requirements but also ensures that the cost will not be too high, and the newly added overflow valve occupies a small volume.

[0028] In order to ensure reduced energy consumption, the second relief valve 7 has a second opening pressure, the third relief valve 8 has a third opening pressure, the first opening pressure is greater than the second opening pressure, and the second opening pressure is greater than the third opening pressure. The first flow channel of the first relief valve 6 is used as a pressure relief flow channel of the system, and its opening pressure is relatively large, otherwise the oil pressure of the injection cylinder 5 cannot be guaranteed. The second relief valve 7 also needs to properly maintain the pressure in the injection cylinder 5, but because its main purpose is to overflow and preheat the oil, it must be opened before the safety threshold is reached. Therefore, the second opening pressure is less than the first opening pressure. When the third relief valve 8 is used to replenish oil, the first solenoid reversing valve 4 has been closed, and its small opening pressure will not affect the oil pressure of the injection cylinder 5. At the same time, its small opening pressure helps to save energy consumption of the power unit.

[0029] In order to provide back pressure for oil replenishment without affecting overflow, the back pressure valve 12 has a fourth opening pressure. The fourth opening pressure is less than the second opening pressure and also less than the first opening pressure, which can ensure smooth overflow. The fourth opening pressure is greater than the third opening pressure, which can provide oil replenishment back pressure for the rodless chamber of the injection cylinder 5, ensuring that the oil coming out of the third overflow valve 8 can smoothly enter the rodless chamber of the injection cylinder 5.

[0030] In order to realize the switching of oil supply and oil replenishment for the rodless chamber and the rod chamber, the first solenoid reversing valve 4 is provided with a third oil inlet, a first variable oil port, a second variable oil port and a third variable oil port. The third oil inlet is connected to the oil outlet of the power unit, the third variable oil port is connected to the first pipeline, the first variable oil port is connected to the rod chamber of the injection cylinder 5, and the second variable oil port is connected to the rodless chamber of the injection cylinder 5. When the third oil inlet is connected to the first variable oil port, the third variable oil port is connected to the second variable oil port. When the third oil inlet is connected to the second variable oil port, the third variable oil port is connected to the first variable oil port. It can be switched by an electromagnet, and the power unit can supply oil to the rodless chamber or the rod chamber of the injection cylinder 5 through the first solenoid reversing valve 4. At the same time, the third overflow valve 8 can also replenish oil to the rodless chamber or the rod chamber of the injection cylinder 5 through the first solenoid reversing valve 4.

[0031] Specifically, the power unit includes a motor 2 and a hydraulic pump 3. The motor 2 is used to provide power for the hydraulic pump 3. The oil inlet of the hydraulic pump 3 is connected to the oil tank 1 through a second pipe. An oil filter is provided on one end of the second pipe located in the oil tank 1. When the hydraulic pump 3 absorbs oil, the oil is filtered through the oil filter to ensure that no larger impurities enter the hydraulic pump 3.

[0032] Specifically, the system oil circuit also includes a cooler 14, a liquid level gauge 15 and an air filter 16. The cooler 14 is located between the back pressure valve 12 and the oil tank 1. When the oil needs to be cooled, the oil can be cooled before returning to the oil tank 1 to achieve temperature regulation. The liquid level gauge 15 is located in the oil tank 1. The liquid level gauge 15 can be used to observe the oil height in the oil tank 1 to determine whether the oil needs to be replenished. The air filter 16 is installed at the ventilation port of the oil tank 1 to prevent dust and impurities in the air from entering the oil tank 1.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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. An electric pre-plasticization control system capable of preheating oil temperature, characterized in that: It includes a system oil circuit and an oil replenishment oil circuit, the system oil circuit includes an oil tank, a power unit, a first electromagnetic reversing valve and an injection oil cylinder, the oil inlet of the power unit is connected to the oil tank, and can be connected to the oil inlet of the rod chamber or the rodless chamber of the injection oil cylinder through the first electromagnetic reversing valve, and the oil outlet of the rod chamber or the rodless chamber of the injection oil cylinder can be connected to the oil tank through the first electromagnetic reversing valve; The oil replenishment circuit includes a first relief valve, a second relief valve, a third relief valve, a second electromagnetic reversing valve and a back pressure valve, the oil inlet of the back pressure valve is connected to the rodless chamber of the injection cylinder through a first pipeline, and the oil outlet of the back pressure valve is connected to the oil tank; The first overflow valve has a first flow channel and a second flow channel connected to an oil inlet, the oil inlet of the first overflow valve is connected to an oil outlet of the power unit, the oil outlet of the first flow channel is connected to the first pipeline, and the oil outlet of the second flow channel is connected to an oil inlet of the second electromagnetic reversing valve, wherein the first flow channel has a first opening pressure; The second electromagnetic reversing valve comprises a first electromagnet, a second electromagnet, a first oil outlet and a second oil outlet, the first oil outlet is communicated with the oil inlet of the second relief valve, the oil outlet of the second relief valve is communicated with the first pipeline, the second oil outlet is communicated with the oil inlet of the third relief valve, and the oil outlet of the third relief valve is communicated with the first pipeline; When the injection cylinder is in a material storage state, the second electromagnet is energized, the oil inlet of the second electromagnetic reversing valve is connected with the second oil outlet, and can be connected with the rodless chamber of the injection cylinder through the third relief valve, so as to replenish oil for the rodless chamber of the injection cylinder; When the first electromagnet is energized, the oil inlet of the second electromagnetic reversing valve is communicated with the first oil outlet, and can overflow through the second overflow valve to increase the temperature of the oil.

2. The electric pre-plasticization control system capable of oil temperature preheating according to claim 1 is characterized in that: The second relief valve has a second opening pressure, the third relief valve has a third opening pressure, the first opening pressure is greater than the second opening pressure, and the second opening pressure is greater than the third opening pressure.

3. The electric pre-plasticization control system capable of oil temperature preheating according to claim 2 is characterized in that: The back pressure valve has a fourth opening pressure, the fourth opening pressure is less than the second opening pressure, and the fourth opening pressure is greater than the third opening pressure.

4. The electric pre-plasticization control system capable of oil temperature preheating according to claim 1 is characterized in that: The first electromagnetic reversing valve is provided with a third oil inlet, a first variable oil port, a second variable oil port and a third variable oil port, the third oil inlet is communicated with the oil outlet of the power unit, the third variable oil port is communicated with the first pipeline, the first variable oil port is communicated with the rod chamber of the injection cylinder, and the second variable oil port is communicated with the rodless chamber of the injection cylinder; When the third oil inlet is communicated with the first variable oil port, the third variable oil port is communicated with the second variable oil port; when the third oil inlet is communicated with the second variable oil port, the third variable oil port is communicated with the first variable oil port.

5. The electric pre-plasticization control system capable of oil temperature preheating according to claim 1 is characterized in that: The power unit includes a motor and a hydraulic pump. The motor is used to provide power for the hydraulic pump. The oil inlet of the hydraulic pump is connected to the oil tank through a second pipeline. An oil filter is provided on one end of the second pipeline located in the oil tank.

6. The electric pre-plasticization control system capable of oil temperature preheating according to claim 1, characterized in that: The system oil circuit also includes a cooler, a liquid level gauge and an air filter. The cooler is located between the back pressure valve and the oil tank, the liquid level gauge is located in the oil tank, and the air filter is installed at the ventilation port of the oil tank.

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