An integrated injection rail plate device

Abstract

The application is suitable for the technical field of injection molding machine equipment, and provides an integrated injection oil circuit board device. The injection oil circuit board device provided by the application has the following advantages in use: hydraulic oil enters the system pressure oil inlet through an external oil supply device, enters a pilot reversing valve through a first oil inlet, a first one-way valve is arranged between one end of a pilot oil circuit of the pilot reversing valve and the first oil inlet, so that the pilot oil pressure of the pilot reversing valve can be maintained, pressure impact on the pilot circuit during injection is avoided, the pilot oil pressure is prevented from dropping or even being released, and the stability during injection is improved, the other end of the pilot oil circuit of the pilot reversing valve is directly connected with an external oil tank, the pilot oil liquid has an unobstructed oil return path, and the efficiency and smoothness during the drainage of the pilot oil liquid are improved.

Description

Technical Field

[0001] This application belongs to the technical field of injection molding machine equipment, and in particular relates to an integrated injection oil circuit board device. Background Technology

[0002] Existing injection molding machines generally use hydraulic control systems for motion control, and the injection cylinder is an important part of it. As the power device that ejects the melt from the nozzle, its stability and smoothness are particularly important.

[0003] In the existing hydraulic circuit of the injection cylinder, a pilot-operated directional valve is often used to control the extension and retraction of the injection cylinder. During injection, excessive pressure causes the oil to back up and impact the pilot circuit, which in turn causes the pressure of the pilot control oil to drop or depressurize. This causes the valve core of the pilot-operated directional valve to vibrate or even reset, resulting in unstable and unsmooth injection.

[0004] Therefore, there is an urgent need to improve the hydraulic circuit of the injection molding machine to ensure that the injection molding machine operates stably and smoothly during injection. Utility Model Content

[0005] This application provides an integrated injection hydraulic circuit board device, which can solve the problem that excessive pressure in the hydraulic circuit of the existing injection cylinder causes the oil to back up and impact the pilot circuit, resulting in a drop or pressure relief of the pilot control oil, causing the valve core of the pilot-operated directional valve to vibrate or even reset, thus leading to unstable and unsmooth injection.

[0006] This application provides an integrated injection manifold device. The injection manifold device includes a system pressure inlet, a total return port, a first oil circuit, and a pilot-operated directional valve. Both the system pressure inlet and the total return port are located on the injection manifold device. The system pressure inlet can be connected to the pipeline of an external oil supply device, and the total return port can be connected to an external oil tank. One end of the inlet of the first oil circuit is connected to the system pressure inlet, and one end of the return of the first oil circuit is connected to the total return port. The end of the inlet of the first oil circuit furthest from the system pressure inlet is connected to the P port of the pilot-operated directional valve. The end of the return oil circuit of the first oil circuit away from the main return oil port is connected to the T port of the pilot-operated directional valve. The pilot-operated directional valve can be connected to an external injection cylinder. The cylinder body of the injection cylinder is divided into a rod chamber and a rodless chamber. The A port and B port of the pilot-operated directional valve can be connected to the rod chamber and the rodless chamber of the injection cylinder, respectively. One end of the pilot oil circuit of the pilot-operated directional valve is connected to the inlet oil circuit of the first oil circuit through a first check valve. The other end of the pilot oil circuit of the pilot-operated directional valve is connected to an external oil tank. The first check valve is used to allow oil from the outlet oil circuit of the first oil circuit to flow unidirectionally into the pilot oil circuit of the pilot-operated directional valve.

[0007] Optionally, the injection circuit board device also includes a back pressure gauge assembly, which can be connected to the injection cylinder for monitoring injection back pressure.

[0008] Optionally, the back pressure gauge assembly includes a pressure sensor, a first two-way cartridge valve, a first directional valve, a proportional valve, and a back pressure gauge. The inlet of the first two-way cartridge valve is connected to the rod chamber of the injection cylinder. The pressure sensor is connected to the passage between the rod chamber of the injection cylinder and the first two-way cartridge valve. The control terminal of the first two-way cartridge valve is connected to the P port of the first directional valve. The valve core of the first two-way cartridge valve is axially perforated and damped, used to supply oil from the inlet of the first two-way cartridge valve to the P port of the first directional valve. The outlet of the proportional valve is connected to the outlet of the first two-way cartridge valve. The back pressure gauge is connected to the inlet of the proportional valve. The passage connecting the first two-way cartridge valve and the proportional valve is connected to an external oil tank. The T port of the first directional valve is blocked. The A and B ports of the first directional valve are connected in series and then connected to the passage between the proportional valve and the back pressure gauge.

[0009] Optionally, the injection circuit board device also has a second oil circuit. The inlet of the second oil circuit is connected in series with the inlet of the first oil circuit and is connected to the system pressure inlet. The outlet of the second oil circuit is connected in series with the return of the first oil circuit and is connected to the main return port. A second directional valve is provided on the second oil circuit. The second directional valve can be connected to an external injection cylinder. The cylinder body of the injection cylinder is divided into a rod chamber and a rodless chamber. The inlet of the second oil circuit is connected to the P port of the second directional valve. The return of the second oil circuit is connected to the T port of the second directional valve. The A port and B port of the second directional valve are connected to the rod chamber and rodless chamber of the injection cylinder, respectively.

[0010] Optionally, the oil inlet of the second oil circuit is connected to the P port of the second directional valve through the second check valve. The second check valve is used to allow oil in the oil inlet of the second oil circuit to flow unidirectionally into the P port of the second directional valve.

[0011] Optionally, a first relief valve is provided between the second directional valve and the rod chamber of the injection cylinder.

[0012] Optionally, the injection circuit board device also includes a third oil circuit, a second two-way cartridge valve, and a third directional valve. The inlet of the third oil circuit is connected in series with the inlet of the first oil circuit and then connected to the system pressure inlet. The end of the inlet of the third oil circuit away from the system pressure inlet is connected to the inlet of the second two-way cartridge valve. The outlet of the second two-way cartridge valve can be connected to the inlet of an external melt motor. The outlet of the melt motor can be connected to the return oil circuit of the third oil circuit. The drain port of the melt motor can be connected to an external oil tank. The return oil circuit of the third oil circuit is connected in series with the return oil circuit of the first oil circuit and then connected to the main return oil port. The P port of the third directional valve is connected to the control terminal of the second two-way cartridge valve. The T port of the third directional valve is blocked. The A port of the third directional valve is connected to the inlet of the third oil circuit. The B port of the third directional valve is connected to the return oil circuit of the third oil circuit.

[0013] Optionally, a second relief valve is connected in series between the connection point of the first check valve and the inlet of the first oil circuit to the system pressure inlet and the return oil circuit of the first oil circuit.

[0014] Optionally, a total pressure gauge is installed in the passage between the connection between the first check valve and the oil inlet of the first oil circuit and the system pressure inlet.

[0015] The injection hydraulic circuit board device provided in this application, when in use, allows hydraulic oil to enter the system pressure inlet through an external oil supply device, and then enters the pilot-operated directional valve through the inlet of the first oil circuit. By adjusting the valve core position of the pilot-operated directional valve, the oil flow into port A / B of the pilot-operated directional valve is adjusted, thereby ensuring that the rod-side / rodless-side of the injection cylinder receives oil. At this time, the rod-side / rod-side of the injection cylinder discharges the oil into port B / A of the pilot-operated directional valve, and then flows to port T of the pilot-operated directional valve, entering the return oil circuit of the first oil circuit and finally flowing to the main return oil port, thus completing the extension and retraction process of the injection cylinder. By adjusting the valve core position of the pilot-operated directional valve to its A port... By ensuring that the port connected to the rodless cylinder of the injection cylinder in port B is not connected to port P of the pilot-operated directional valve, the hydraulic rod of the injection cylinder remains in a state where it neither extends nor retracts. By setting a first check valve between one end of the pilot oil circuit of the pilot-operated directional valve and the inlet oil circuit of the first oil circuit, the pilot oil pressure of the pilot-operated directional valve can be maintained, avoiding pressure impact on the pilot circuit during injection, which could cause a drop in pilot oil pressure or even pressure leakage, thereby improving the stability during injection. By directly connecting the other end of the pilot oil circuit of the pilot-operated directional valve to an external oil tank, the pilot oil has a resistance-free return path, improving the efficiency and smoothness of pilot oil discharge.

[0016] Other beneficial effects of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Hydraulic circuit diagram of an injection hydraulic circuit board device, an external oil supply device, an external oil tank, an injection cylinder, an injection transfer cylinder, a sol motor, and a cooler provided in an embodiment of this application;

[0019] Figure 2 A schematic diagram of the structure of the injection oil circuit board device provided in an embodiment of this application. Figure 1 ;

[0020] Figure 3 A schematic diagram of the structure of the injection oil circuit board device provided in an embodiment of this application. Figure 2 .

[0021] [Explanation of Labels in the Attached Image]

[0022] 100. Injection oil circuit board device

[0023] 101. System pressure oil inlet; 102. Main oil return port;

[0024] 200. External oil supply device;

[0025] 300. External fuel tank;

[0026] 400. Injection cylinder;

[0027] 500. Injection displacement cylinder;

[0028] 600, Sol motor;

[0029] 700. Cooler;

[0030] 1. First oil circuit; 2. Pilot-operated directional valve; 3. First check valve;

[0031] 4. Back pressure gauge set;

[0032] 41. Pressure sensor; 42. First two-way cartridge valve; 43. First directional valve; 44. Proportional valve; 45. Back pressure gauge;

[0033] 5. Second oil circuit; 6. Second directional valve; 7. Second check valve; 8. First relief valve; 9. Third oil circuit; 10. Second two-way cartridge valve; 11. Third directional valve; 12. Second relief valve; 13. Total pressure gauge. Detailed Implementation

[0034] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0035] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0041] Currently, in the existing hydraulic circuits of injection cylinders, excessive pressure during injection causes the oil to back up and impact the pilot circuit, resulting in a drop or pressure relief in the pilot control oil. This causes the valve core of the pilot-operated directional valve to vibrate or even reset, leading to unstable and unsmooth injection.

[0042] To address the aforementioned problems, one embodiment of this application provides an integrated injection oil circuit board device, such as... Figures 1 to 3 As shown, the injection circuit board device 100 has a system pressure inlet 101, a total return port 102, a first oil circuit 1, and a pilot-operated directional valve 2. The system pressure inlet 101 and the total return port 102 are both located on the injection circuit board device 100. The system pressure inlet 101 can be connected to the pipeline of an external oil supply device 200, and the total return port 102 can be connected to an external oil tank 300. One end of the inlet of the first oil circuit 1 is connected to the system pressure inlet 101, and one end of the return of the first oil circuit 1 is connected to the total return port 102. The end of the inlet of the first oil circuit 1 furthest from the system pressure inlet 101 is connected to the P port of the pilot-operated directional valve 2. One end of the return oil path of oil circuit 1, away from the main return oil port 102, is connected to the T port of pilot-operated directional valve 2. Pilot-operated directional valve 2 can be connected to an external injection cylinder 400. The cylinder body of injection cylinder 400 is divided into a rod chamber and a rodless chamber. Ports A and B of pilot-operated directional valve 2 can be connected to the rod chamber and the rodless chamber of injection cylinder 400, respectively. One end of the pilot oil path of pilot-operated directional valve 2 is connected to the inlet oil path of first oil circuit 1 through a first check valve 3. The other end of the pilot oil path of pilot-operated directional valve 2 is connected to an external oil tank 300. The first check valve 3 is used to allow oil from the outlet oil path of first oil circuit 1 to flow unidirectionally into the pilot oil path of pilot-operated directional valve 2.

[0043] When the injection hydraulic circuit board device 100 provided in this application is in use, hydraulic oil enters the system pressure inlet 101 through the external oil supply device 200, and then enters the pilot-operated directional valve 2 through the oil inlet of the first oil circuit 1. By adjusting the valve core position of the pilot-operated directional valve 2, the oil flow into the A / B port of the pilot-operated directional valve 2 is adjusted, thereby ensuring that the rod chamber / rodless chamber of the injection cylinder 400 receives oil. At this time, the rodless chamber / rod chamber of the injection cylinder 400 discharges the oil in the chamber to the B / A port of the pilot-operated directional valve 2, and then flows to the T port of the pilot-operated directional valve 2, entering the return oil circuit of the first oil circuit 1 and finally flowing to the main return oil port 102, thus completing the extension and retraction process of the injection cylinder 400. By adjusting the pilot-operated directional valve 2... By ensuring that the valve core is positioned such that the port A / B of the injection cylinder 400, which is connected to the rodless cylinder of the injection cylinder 400, is not connected to the P port of the pilot-operated directional valve 2, the hydraulic rod of the injection cylinder 400 remains in a state where it neither extends nor retracts. By setting a first check valve 3 between one end of the pilot oil circuit of the pilot-operated directional valve 2 and the inlet oil circuit of the first oil circuit 1, the pilot oil pressure of the pilot-operated directional valve 2 can be maintained, preventing pressure impact on the pilot circuit during injection, which could cause a drop in pilot oil pressure or even pressure leakage, thereby improving the stability during injection. By directly connecting the other end of the pilot oil circuit of the pilot-operated directional valve 2 to the external oil tank 300, the pilot oil has a free return path, improving the efficiency and smoothness of pilot oil discharge.

[0044] Specifically, the aforementioned pilot-operated directional valve 2 is a three-position four-way electro-hydraulic pilot-operated directional valve 2, and its valve core is Z-shaped in the neutral position. When the valve core of the aforementioned three-position four-way electro-hydraulic pilot-operated directional valve 2 is in the neutral position, its P port is not connected to other ports, and the injection cylinder 400 will be in a holding state, that is, its hydraulic rod neither extends nor retracts.

[0045] It is understandable that when the aforementioned pilot-operated directional valve 2 is a three-position four-way electro-hydraulic pilot-operated directional valve 2, it can be connected to the controller of the injection molding machine, thereby controlling the valve core state and the required pilot pressure of the aforementioned three-position four-way electro-hydraulic pilot-operated directional valve 2 as needed. It should be noted that the aforementioned controller is a commonly used control element in the prior art, and its specific working process will not be described in detail here. It should be noted that the controller's control of the valve core state and the required pilot pressure of the aforementioned three-position four-way electro-hydraulic pilot-operated directional valve 2 are functions inherent to the controller itself.

[0046] It is understood that the aforementioned external oil supply device 200 can be a delivery pump, and the aforementioned main return oil circuit can also be connected to the cooler 700 to flow to other oil circuits / external oil tanks 300 of the injection molding machine.

[0047] In some embodiments of this application, such as Figure 1 As shown, the rod chamber of the injection cylinder 400 is connected to a back pressure gauge group 4, which is used to monitor the injection back pressure.

[0048] The back pressure gauge group 4 is connected to the rod chamber of the injection cylinder 400 to measure the injection back pressure during injection.

[0049] It is understood that the aforementioned back pressure gauge group 4 can be connected to the controller of the injection molding machine to transmit the injection back pressure information obtained by the back pressure gauge group 4 to the controller of the injection molding machine. The controller then controls other parts or components of the injection molding machine according to the back pressure information and the preset back pressure value to adjust the injection back pressure. It should be noted that the aforementioned controller is a commonly used control element in the prior art, and its specific working process will not be described in detail here. It should be noted that the controller's function of receiving the injection back pressure information obtained by the back pressure gauge group 4 and controlling other parts or components of the injection molding machine according to the back pressure information and the preset back pressure value to adjust the injection back pressure is a function inherent to the controller itself.

[0050] In some embodiments of this application, such as Figures 1 to 3 As shown, the back pressure gauge assembly 4 includes a pressure sensor 41, a first two-way cartridge valve 42, a first directional valve 43, a proportional valve 44, and a back pressure gauge 45. The oil inlet of the first two-way cartridge valve 42 is connected to the rod chamber of the injection cylinder 400. The pressure sensor 41 is connected to the passage between the rod chamber of the injection cylinder 400 and the first two-way cartridge valve 42. The control terminal of the first two-way cartridge valve 42 is connected to the P port of the first directional valve 43. The valve core of the first two-way cartridge valve 42 is axially... The passageway is equipped with damping and is used to supply oil from the inlet of the first two-way cartridge valve 42 to the P port of the first directional valve 43. The outlet of the proportional valve 44 is connected to the outlet of the first two-way cartridge valve 42. The back pressure gauge 45 is connected to the inlet of the proportional valve 44. The passageway connecting the first two-way cartridge valve 42 and the proportional valve 44 is connected to the external oil tank 300. The T port of the first directional valve 43 is blocked. The A port and B port of the first directional valve 43 are connected in series and then connected to the passageway between the proportional valve 44 and the back pressure gauge 45.

[0051] In the above embodiment, oil flows from the rod chamber of the injection cylinder 400 into the inlet of the first two-way cartridge valve 42. Simultaneously, the pressure sensor 41 measures the injection pressure within the injection cylinder 400 in real time. The oil flows through the valve core of the first two-way cartridge valve 42 into the control end of the first two-way cartridge valve 42 and then into the P port of the first directional valve 43. Because the valve core of the first two-way cartridge valve 42 is damped, the oil pressure at the control end of the first two-way cartridge valve 42 is lower than the oil pressure at the inlet of the first two-way cartridge valve 42. This allows the valve core of the first two-way cartridge valve 42 to be normally pushed by the oil flowing into the inlet of the first two-way cartridge valve 42. When the oil pressure at the inlet of the first two-way cartridge valve 42 reaches a preset value, the valve core of the first two-way cartridge valve 42 is pushed open, and the first two... The outlet of the cartridge valve 42 is connected to the inlet of the first two-way cartridge valve 42 to discharge oil to the external oil tank 300. After the oil enters the P port of the first directional valve 43 through the inlet of the first two-way cartridge valve 42, the oil can flow out from the A port / B port of the first directional valve 43 or not by adjusting the position of the valve core of the first directional valve 43. After the oil flows out through the A port / B port of the first directional valve 43, it will enter the passage between the proportional valve 44 and the back pressure gauge 45. At this time, the back pressure gauge 45 can measure the back pressure. The proportional valve 44 is used to set the preset back pressure value. When the preset back pressure value is reached, the valve core of the proportional valve 44 is pushed to the working position by the pilot oil in the oil circuit, so that the oil flows to the external oil tank 300 to achieve pressure relief and oil discharge.

[0052] Specifically, the aforementioned pressure sensor 41 is a liquid pressure sensor 41. The specific model of the liquid pressure sensor 41 can be selected as needed, and will not be elaborated further here. The aforementioned first directional valve 43 is specifically a three-position four-way solenoid directional valve, with the middle position being O-type. The aforementioned proportional valve 44 is a proportional relief valve, specifically a pilot-operated proportional relief valve. It can be understood that the aforementioned pressure sensor 41, first directional valve 43, proportional valve 44, and back pressure gauge 45 can all be electrically connected to the injection molding machine's controller. The pressure sensor 41 can send real-time injection pressure information to the injection molding machine, and the back pressure gauge 45 can send injection back pressure information to the controller. The controller can then adjust the parameters accordingly. The controller controls the valve core position of the first directional valve 43, the overflow pressure of the proportional valve 44, and the valve core position and required pilot pressure of the pilot-operated directional valve 2 based on real-time injection pressure and injection back pressure information. This is a common method used in existing injection molding machines. The specific control method will not be elaborated on here. It should be noted that the controller receives the real-time injection pressure signal transmitted by the pressure sensor 41 and the injection back pressure signal transmitted by the back pressure gauge 45, and controls the valve core position of the first directional valve 43, the overflow pressure of the proportional valve 44, and the valve core position and required pilot pressure of the pilot-operated directional valve 2 based on these signals.

[0053] In some embodiments of this application, such as Figures 1 to 3As shown, the injection oil circuit board device 100 also has a second oil circuit 5. The oil inlet of the second oil circuit 5 is connected in series with the oil inlet of the first oil circuit 1 and is connected to the system pressure oil inlet 101. The oil outlet of the second oil circuit 5 is connected in series with the oil return of the first oil circuit 1 and is connected to the main oil return port 102. A second reversing valve 6 is provided on the second oil circuit 5. The second reversing valve 6 can be connected to an external injection cylinder 500. The cylinder body of the injection cylinder 500 is divided into a rod chamber and a rodless chamber. The oil inlet of the second oil circuit 5 is connected to the P port of the second reversing valve 6. The oil return of the second oil circuit 5 is connected to the T port of the second reversing valve 6. The A port and B port of the second reversing valve 6 are respectively connected to the rod chamber and the rodless chamber of the injection cylinder 500.

[0054] The inlet of the second oil circuit 5 is connected in series with the inlet of the first oil circuit 1 and is connected to the system pressure inlet 101. Oil can be supplied to both the first oil circuit 1 and the second oil circuit 5 simultaneously through the system pressure inlet 101. Oil enters the second directional valve 6 through the inlet of the first oil circuit 1. By adjusting the valve core position of the second directional valve 6, the A / B port of the second directional valve 6 is adjusted, thereby ensuring that oil is supplied to the rod chamber / rodless chamber of the ejector cylinder 500. At this time, the ejector cylinder 500... The rodless / rod chamber discharges the oil into port B / port A of the second directional valve 6, then flows into the return oil circuit of the second oil circuit 5 via port T of the second directional valve 6, and finally flows into the main return oil port 102, thereby completing the extension and retraction process of the injection cylinder 500. By adjusting the valve core position of the second directional valve 6 so that the port A / B connected to the rodless cylinder of the injection cylinder 500 is not connected to the port P of the second directional valve 6, the hydraulic rod of the injection cylinder 500 can be kept in a state where it neither extends nor retracts.

[0055] Specifically, the second directional valve 6 is a three-position four-way solenoid valve, with its center position being O-type. The second directional valve 6 can be connected to the controller in the injection molding machine. The controller can control the valve core position of the second directional valve 6 to control the working state of the injection cylinder 500. It can be understood that if the second directional valve 6 is a pilot-operated directional valve 2, the controller can also control the required pilot pressure of the second directional valve 6. It should be noted that the controller controlling the valve core position of the second directional valve 6 based on the acquired signals or data is a function of the controller itself.

[0056] In some embodiments of this application, such as Figures 1 to 3 As shown, the oil inlet of the second oil circuit 5 is connected to the P port of the second directional valve 6 through the second check valve 7. The second check valve 7 is used to allow the oil in the oil inlet of the second oil circuit 5 to flow into the P port of the second directional valve 6 in one direction.

[0057] The aforementioned second check valve 7 is used for pressure preservation. After the oil enters the P port of the second directional valve 6 through the inlet of the second oil circuit 5, it will not flow backward, thus making the operation of the injection cylinder 500 more stable.

[0058] In some embodiments of this application, such as Figure 1 As shown, a first relief valve 8 is provided between the second reversing valve 6 and the rod chamber of the injection cylinder 500.

[0059] The first relief valve 8 is used to prevent the oil from entering the injection cylinder 500 directly through the second directional valve 6 at excessive pressure. Adjusting the relief valve can protect the injection cylinder 500 and prevent excessive pressure.

[0060] Specifically, the aforementioned first relief valve 8 can be a pilot-operated relief valve.

[0061] In some embodiments of this application, such as Figures 1 to 3 As shown, the injection circuit board device 100 also includes a third oil circuit 9, a second two-way cartridge valve 10, and a third directional valve 11. The oil inlet of the third oil circuit 9 is connected in series with the oil inlet of the first oil circuit 1 and then connected to the system pressure inlet 101. The end of the oil inlet of the third oil circuit 9 away from the system pressure inlet 101 is connected to the oil inlet of the second two-way cartridge valve 10. The oil outlet of the second two-way cartridge valve 10 can be connected to the oil inlet of an external melt glue motor, and the oil outlet of the melt glue motor can... It can be connected to the return oil circuit of the third oil circuit 9. The drain port of the melt motor can be connected to the external oil tank 300. The return oil circuit of the third oil circuit 9 is connected in series with the return oil circuit of the first oil circuit 1 and then connected to the main return oil port 102. The P port of the third directional valve 11 is connected to the control terminal of the second two-way cartridge valve 10. The T port of the third directional valve 11 is blocked. The A port of the third directional valve 11 is connected to the inlet oil circuit of the third oil circuit 9. The B port of the third directional valve 11 is connected to the return oil circuit of the third oil circuit 9.

[0062] The inlet of the third oil circuit 9 is connected in series with the inlet of the first oil circuit 1 and is connected to the system pressure inlet 101. The first oil circuit 1 and the third oil circuit 9 can be supplied with oil simultaneously through the system pressure inlet 101. The oil enters the inlet of the second two-way cartridge valve 10 through the inlet of the third oil circuit 9 and flows to the A port of the third directional valve 11. By adjusting the position of the valve core of the third directional valve 11, the A port / B port of the third directional valve 11 can be connected to the P port, so that the oil flows back to the inlet / return of the third oil circuit 9. When the oil pressure in the inlet of the third oil circuit 9 reaches the set value, it will push open the valve core of the second two-way cartridge valve 10, so that oil can be supplied to the sol motor 600.

[0063] Specifically, the aforementioned third directional valve 11 can be a two-position four-way solenoid valve. The third directional valve 11 can be connected to the controller in the injection molding machine. The controller can control the valve core position of the third directional valve 11 to the working state of the second two-way cartridge valve 10, thereby controlling the working state of the sol motor 600. It can be understood that the controller controls the valve core position of the third directional valve 11 according to the acquired signals or data, which is its own function.

[0064] In some embodiments of this application, such as Figure 1 As shown, the passage between the first check valve 3 and the oil inlet of the first oil circuit 1 and the system pressure inlet 101 is connected in series with the return oil circuit of the first oil circuit 1 by a second relief valve 12.

[0065] The aforementioned second relief valve 12 is used to prevent the system oil pressure from being too high. When the pressure in this passage is too high, the oil will flow from the oil inlet of the first oil passage 1 to the oil return of the first oil passage 1 through the relief valve.

[0066] In some embodiments of this application, such as Figure 1 As shown, when the first oil passage 1, the second oil passage 5, and the third oil passage 9 exist simultaneously, the oil inlet of the second oil passage 5 and the oil inlet of the third oil passage 9 are both connected to the passage between the first check valve 3 and the system pressure inlet 101. In this way, the second relief valve 12 can play an overall regulating role. When the first oil passage 1, the second oil passage 5, and the third oil passage 9 exist simultaneously, the second relief valve 12 can adjust the pressure of the total oil inlet of the first oil passage 1, the second oil passage 5, and the third oil passage 9 to prevent the pressure on the total oil inlet from being too high.

[0067] Specifically, the second relief valve 12 mentioned above can be a pilot-operated relief valve.

[0068] In some embodiments of this application, such as Figure 1 As shown, a total pressure gauge 13 is installed in the passage between the connection between the first check valve 3 and the oil inlet of the first oil circuit 1 and the system pressure inlet 101.

[0069] The aforementioned total pressure gauge 13 is used to measure the oil pressure in the passage between the connection between the first check valve 3 and the oil inlet of the first oil circuit 1 and the system pressure inlet 101, so that the oil pressure can be adjusted in time when it is too high or too low.

[0070] In some specific embodiments, when the first oil passage 1, the second oil passage 5, and the third oil passage 9 are present simultaneously, the total pressure gauge 13 can monitor the pressure of the total oil inlet of the first oil passage 1, the second oil passage 5, and the third oil passage 9 to obtain the total pressure data of the total oil inlet of the first oil passage 1, the second oil passage 5, and the third oil passage 9.

[0071] It is understood that the aforementioned total pressure gauge 13 can be connected to the controller of the injection molding machine to send the total pressure data of the first oil line 1, the second oil line 5 and the third oil line 9 to the controller. The controller can control other components or units to perform corresponding actions based on the total pressure data. It should be noted that the controller is a commonly used control element in injection molding machines in the prior art. Its function is to receive the total pressure data from the total pressure gauge 13 and control other components or units to perform corresponding actions based on the data.

[0072] Another aspect of this application provides an injection molding machine, including the injection circuit board device 100 provided in any of the above embodiments.

[0073] Because the injection molding machine includes the injection circuit board device 100 provided in any of the above embodiments, the injection molding machine is stable and smooth during injection, and in some specific embodiments, the injection molding machine has good precision control capability.

[0074] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An integrated injection oil circuit board device, characterized in that, The injection oil circuit board device (100) has a system pressure inlet (101), a total return port (102), a first oil circuit (1), and a pilot-operated directional valve (2). The system pressure inlet (101) and the total return port (102) are both located on the injection oil circuit board device (100). The system pressure inlet (101) can be connected to the pipeline of an external oil supply device (200), and the total return port (102) can be connected to an external oil tank (300). One end of the inlet of the first oil circuit (1) is connected to the system pressure inlet (101), and one end of the return of the first oil circuit (1) is connected to the total return port (102). The end of the inlet of the first oil circuit (1) away from the system pressure inlet (101) is connected to the P port of the pilot-operated directional valve (2). The return oil path of the first oil path (1) is connected to the T port of the pilot-operated directional valve (2) at the end away from the main return oil port (102). The pilot-operated directional valve (2) can be connected to the external injection cylinder (400). The cylinder body of the injection cylinder (400) is divided into a rod chamber and a rodless chamber. The A port and B port of the pilot-operated directional valve (2) can be connected to the rod chamber and the rodless chamber of the injection cylinder (400) respectively. One end of the pilot oil path of the pilot-operated directional valve (2) is connected to the inlet oil path of the first oil path (1) through a first check valve (3). The other end of the pilot oil path of the pilot-operated directional valve (2) is connected to the external oil tank (300). The first check valve (3) is used to allow the oil in the outlet oil path of the first oil path (1) to flow unidirectionally into the pilot oil path of the pilot-operated directional valve (2).

2. The injection oil circuit board device according to claim 1, characterized in that, The injection circuit board device (100) also includes a back pressure gauge group (4), which can be connected to the injection cylinder (400) for monitoring injection back pressure.

3. The injection oil circuit board device according to claim 2, characterized in that, The back pressure gauge assembly (4) includes a pressure sensor (41), a first two-way cartridge valve (42), a first directional valve (43), a proportional valve (44), and a back pressure gauge (45). The inlet of the first two-way cartridge valve (42) is connected to the rod chamber of the injection cylinder (400). The pressure sensor (41) is connected to the passage between the rod chamber of the injection cylinder (400) and the first two-way cartridge valve (42). The control terminal of the first two-way cartridge valve (42) is connected to the P port of the first directional valve (43). The valve core of the first two-way cartridge valve (42) is axially through and... A damper is provided to supply oil from the inlet of the first two-way cartridge valve (42) to the P port of the first directional valve (43). The outlet of the proportional valve (44) is connected to the outlet of the first two-way cartridge valve (42). The back pressure gauge (45) is connected to the inlet of the proportional valve (44). The passage connecting the first two-way cartridge valve (42) and the proportional valve (44) is connected to the external oil tank (300). The T port of the first directional valve (43) is blocked. The A port and B port of the first directional valve (43) are connected in series to the passage between the proportional valve (44) and the back pressure gauge (45).

4. The injection oil circuit board device according to claim 1, characterized in that, The injection oil circuit board device (100) also has a second oil circuit (5). The oil inlet of the second oil circuit (5) is connected in series with the oil inlet of the first oil circuit (1) and is connected to the system pressure oil inlet (101). The oil outlet of the second oil circuit (5) is connected in series with the oil return of the first oil circuit (1) and is connected to the total oil return port (102). A second reversing valve (6) is provided on the second oil circuit (5). The second reversing valve (6) can be connected to an external injection cylinder (500). The cylinder body of the injection cylinder (500) is divided into a rod chamber and a rodless chamber. The oil inlet of the second oil circuit (5) is connected to the P port of the second reversing valve (6). The oil return of the second oil circuit (5) is connected to the T port of the second reversing valve (6). The A port and B port of the second reversing valve (6) are respectively connected to the rod chamber and the rodless chamber of the injection cylinder (500).

5. The injection oil circuit board device according to claim 4, characterized in that, The oil inlet of the second oil circuit (5) is connected to the P port of the second directional valve (6) through the second check valve (7). The second check valve (7) is used to allow the oil in the oil inlet of the second oil circuit (5) to flow unidirectionally into the P port of the second directional valve (6).

6. The injection oil circuit board device according to claim 4, characterized in that, A first relief valve (8) is provided between the second reversing valve (6) and the rod chamber of the injection cylinder (500).

7. The injection oil circuit board device according to claim 1, characterized in that, The injection oil circuit board device (100) further includes a third oil circuit (9), a second two-way cartridge valve (10), and a third directional valve (11). The oil inlet of the third oil circuit (9) is connected in series with the oil inlet of the first oil circuit (1) and then connected to the system pressure inlet (101). The end of the oil inlet of the third oil circuit (9) away from the system pressure inlet (101) is connected to the oil inlet of the second two-way cartridge valve (10). The oil outlet of the second two-way cartridge valve (10) can be connected to the oil inlet of an external melt glue motor. The oil outlet of the melt glue motor can be connected to the third... The return oil circuit of the oil circuit (9) is connected, the drain port of the melt glue motor can be connected to the external oil tank (300), the return oil circuit of the third oil circuit (9) is connected in series with the return oil circuit of the first oil circuit (1) and then connected to the main return oil port (102), the P port of the third reversing valve (11) is connected to the control end of the second two-way cartridge valve (10), the T port of the third reversing valve (11) is blocked, the A port of the third reversing valve (11) is connected to the inlet oil circuit of the third oil circuit (9), and the B port of the third reversing valve (11) is connected to the return oil circuit of the third oil circuit (9).

8. The injection oil circuit board device according to claim 1, characterized in that, The passage between the first check valve (3) and the oil inlet of the first oil circuit (1) to the system pressure inlet (101) is connected in series with the return oil circuit of the first oil circuit (1) by a second relief valve (12).

9. The injection oil circuit board device according to claim 1, characterized in that, A total pressure gauge (13) is installed on the passage between the first check valve (3) and the oil inlet of the first oil circuit (1) and the system pressure inlet (101).

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