A control oil circuit, valve plate and die-casting machine for switching between single and double systems

Abstract

The utility model belongs to the technical field of hydraulic systems, and specifically relates to a control oil circuit, a valve plate, and a die-casting machine for switching between single and double systems. A control oil circuit for switching between single and double systems is proposed, which can divide the hydraulic system of the die-casting machine into a single oil tank oil inlet / return circuit and a double oil tank system oil inlet / return circuit, thereby realizing single system / dual system switching production. The control oil circuit is configured with a first switching valve connected to the first oil cylinder and a second switching valve connected to the second oil cylinder, and the opening and closing states of the first switching valve and the second switching valve are made opposite by a control valve, thereby realizing the single-double system switching function. The utility model also provides a valve plate and a die-casting machine containing the above-mentioned control oil circuit.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic systems, and in particular relates to a control oil circuit, a valve plate and a die-casting machine for switching between single and double systems. Background Art

[0002] With the continuous development of integrated die-casting technology, the mold structure of the die-casting industry has shown a trend of complexity and large-scale, and the hydraulic system has the need for multiple groups of neutron functions to cooperate with each other for production. Since the neutron cylinder is often exposed to a working environment full of impurities and dust, the hydraulic medium is easily contaminated during the frequent movement of the neutron cylinder of the die-casting machine. In addition, during the process of replacing the mold, the frequent removal and installation of the neutron oil pipeline is also likely to mix the surrounding impurities into the hydraulic system. Once the hydraulic medium is contaminated, it will not only cause frequent blockage of the oil filter, but also cause the solenoid valve to be stuck, seriously affecting the long-term safe production of the die-casting machine.

[0003] Chinese patent CN201922003071.8 discloses a dual-system switching hydraulic circuit, which switches between the tire motor travel system and the wheel-rail motor travel system through the different functions of the two-position four-way solenoid valve, which has certain feasibility. However, the solenoid valve has a large leakage and limited oil flow, which cannot be applied to hydraulic circuits with large flow requirements.

[0004] Chinese patent CN201610049987.5 discloses a synchronization system and its oil circuit control method, which uses two independent power units to realize the control switching of neutron and other hydraulic actions through the combination of cartridge valves and solenoid valves. However, the oil circuit has only one oil tank, and the neutron and other functions share the same hydraulic medium, which makes it impossible to realize the independent use of the hydraulic medium of the neutron and other hydraulic actions.

[0005] Therefore, providing an oil circuit with a single-double system switching function is a technical problem to be solved urgently in the field. Utility Model Content

[0006] In view of the existing phenomenon, the technical problem to be solved by the utility model is to provide a control oil circuit, a valve plate and a die-casting machine for switching between single and double systems.

[0007] The technical solution provided in the present application is a control oil circuit for switching between single and double systems, including: a first oil tank; a second oil tank; a first oil cylinder; a second oil cylinder; a first oil circuit connected to the first oil tank for driving the first oil cylinder, the first oil circuit being provided with a first switching valve for controlling the connection and disconnection between the first oil tank and the first cylinder; a second oil circuit connected to the second oil tank for driving the first oil cylinder and the second oil cylinder, the second oil circuit being provided with a second switching valve for controlling the connection and disconnection between the second oil tank and the first cylinder; and also including a control valve that controls the opening and closing states of the first switching valve and the second switching valve to be opposite.

[0008] Furthermore, a three-position four-way reversing valve is provided in front of the first oil cylinder and the second oil cylinder.

[0009] Furthermore, the control valve is a solenoid valve.

[0010] Furthermore, when the control valve loses power, the first switching valve is controlled to be opened and the second switching valve is controlled to be closed; when power is obtained, the first switching valve is controlled to be closed and the second switching valve is controlled to be opened.

[0011] Furthermore, the first oil circuit, the second oil circuit and the control valve are integrated into a valve plate.

[0012] The present application also provides a valve plate integrating the above-mentioned control oil circuit.

[0013] Furthermore, the number of the connecting channel between each first switching valve and the first oil cylinder and the number of the connecting channel between each second switching valve and the first oil cylinder are both more than one.

[0014] The present application also provides a die-casting machine, which includes the above-mentioned control oil circuit, and also includes a neutron and an ejector, wherein the first oil cylinder drives the neutron, and the second oil cylinder drives the ejector.

[0015] Furthermore, the first switching valve is a cartridge valve or a solenoid valve.

[0016] Furthermore, the second switching valve is a cartridge valve.

[0017] The beneficial effects of this application are:

[0018] 1. A control oil circuit for switching between single and double systems is proposed, which can divide the hydraulic system of the die-casting machine into a single oil tank oil inlet / return circuit and a double oil tank system oil inlet / return circuit, so as to realize the switching production between single system and double system. This control oil circuit is provided with a first switching valve connected to the first oil cylinder and a second switching valve connected to the second oil cylinder, and the opening and closing states of the first switching valve and the second switching valve are opposite through the control valve, so as to realize the single and double system switching function. Specifically, when the first switching valve is opened and the second switching valve is closed, the first oil tank drives the first oil cylinder through the first oil circuit, and the second oil tank drives the second oil cylinder through the second oil circuit. The two oil cylinders are supplied with oil respectively by the two oil tanks, that is, the double system works; when the first switching valve is closed and the second switching valve is opened, the second oil tank drives the first oil cylinder and the second oil cylinder at the same time through the second oil circuit. The two oil cylinders are supplied with oil uniformly by the second oil tank, that is, the single system works.

[0019] 2. A valve plate including the above-mentioned control oil circuit is proposed, which has a simple and compact structure and is easy to implement and use.

[0020] 3. A die-casting machine is proposed, comprising the valve plate, neutron and ejector, wherein the first oil cylinder drives the neutron and the second oil cylinder drives the ejector, so that the die-casting machine has the function of switching between single and double systems. In the dual-system state, the neutron function and other hydraulic functions are separately supplied with oil by the first oil tank and the second oil tank, i.e., different power units, and hydraulic media of different types and cleanliness can be used at the same time, thereby avoiding contamination caused by mixing of hydraulic media between the neutron system and the main system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the utility model and are used together with the description to explain the principles of the utility model. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the utility model, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of an embodiment of a control oil circuit provided by the utility model;

[0023] Figure 2 A three-dimensional schematic diagram of an embodiment of a valve plate provided by the utility model;

[0024] Figure 3 A three-dimensional schematic diagram of another direction of an embodiment of a valve plate provided by the utility model;

[0025] Reference numerals:

[0026] The first oil inlet 101; the first oil return port 102; the second oil inlet 201; the second oil return port 202; the first oil cylinder 1; the second oil cylinder 2; the first oil circuit 3; the second oil circuit 4; the control valve 5; the first switching valve 6; the second switching valve 7; the connecting channel 601 between the first switching valve 6 and the first oil cylinder 1; the connecting channel 701 between the second switching valve 7 and the first oil cylinder 1; the three-position four-way reversing valve 8; the plug 9. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Please refer to Figure 1 Embodiment 1 provides a control oil circuit for switching between single and double systems, including: a first oil tank, a second oil tank, a first oil cylinder 1, a second oil cylinder 2, a first oil circuit 3 connected to the first oil tank for driving the first oil cylinder 1, a second oil circuit 4 connected to the second oil tank for driving the first oil cylinder 1 and the second oil cylinder 2, wherein the second oil circuit 4 is provided with a second switching valve 7 for controlling the connection and disconnection between the second oil tank and the first oil cylinder 1; and also includes a control valve 5 for controlling the opening and closing states of the first switching valve 6 and the second switching valve 7 to be opposite.

[0032] The first oil circuit 3 is connected to the first oil tank through the first oil inlet 101 and the first oil return port 102 , and the second oil circuit 4 is connected to the second oil tank through the second oil inlet 201 and the second oil return port 202 .

[0033] Please refer to Figure 1, the control oil circuit is provided with a first switching valve 6 connected to the first oil cylinder 1 and a second switching valve 7 connected to the second oil cylinder 2, and the opening and closing states of the first switching valve 6 and the second switching valve 7 are opposite through the control valve 5, so as to realize the single-double system switching function. Specifically, when the first switching valve 6 is opened and the second switching valve 7 is closed, the first oil tank drives the first oil cylinder 1 through the first oil circuit 3, and the second oil tank drives the second oil cylinder 2 through the second oil circuit 4, and the two oil cylinders are supplied with oil by the two oil tanks respectively, that is, the double system works; when the first switching valve 6 is closed and the second switching valve 7 is opened, the second oil tank drives the first oil cylinder 1 and the second oil cylinder 2 at the same time through the second oil circuit 4, and the two oil cylinders are supplied with oil by the second oil tank at the same time, that is, the single system works.

[0034] The first oil tank supplies oil to the first oil cylinder 1 and the second oil cylinder 2 in a unified manner as a single system. At this time, a single hydraulic medium is used in the system. When a single system is sufficient to meet the use requirements, this application can use a single system for oil supply. In the dual-system state, the first oil cylinder 1 and the second oil cylinder 2 are supplied with oil separately by different oil tanks. At this time, hydraulic media of different types and cleanliness can be used at the same time to avoid contamination caused by mixing of hydraulic media between the two systems.

[0035] Before use, it should be determined whether to use a single system or a dual system according to the use requirements. In particular, if it is necessary to switch from a single system to a dual system before use, it should be ensured that the residual oil in the first oil cylinder 1 and its pipeline will not affect the overall oil circuit.

[0036] Please refer to Figure 1 In this embodiment, a three-position four-way reversing valve 8 is provided in front of the first oil cylinder 1 and the second oil cylinder 2. Specifically, the three-position four-way reversing valve 8 has three working positions and four oil ports. The three working positions are mold opening state, mold locking state, and the static state in which the valve is naturally in the middle position when not working. The four oil ports are a pressure oil port for oil inlet, a return oil port for outputting oil to a circuit point, and a first inlet and outlet oil port and a second inlet and outlet oil port that switch the state according to the working needs of the oil cylinder.

[0037] In the present embodiment, the control valve 5 is a solenoid valve. Solenoid valves can be opened or closed quickly, and the response time is usually between a few milliseconds and tens of milliseconds, which makes them very useful in systems that require fast switching. Solenoid valves are simple to control and are usually used for simple on / off control, that is, they have only two working states, which is suitable for occasions where the present application is used to switch oil circuits. In the present embodiment, the control valve 5 is a solenoid valve that controls the on / off state of two switching valves at the same time, so that the response time of the single / dual system switching action is shortened and the cost is also reduced. The control valve 5 can also be set to multiple in other embodiments to control the first switching valve 6 and the second switching valve 7 separately.

[0038] In this embodiment, when the control valve 5 loses power, the first switching valve 6 is controlled to be opened and the second switching valve 7 is closed; when the control valve 5 is powered on, the first switching valve 6 is controlled to be closed and the second switching valve 7 is controlled to be opened. The advantage of this setting is that when the solenoid valve loses power abnormally or the valve is stuck, the control oil circuit is in a dual system state, avoiding mixing of hydraulic media in the two oil tanks and causing oil circuit pollution.

[0039] In this embodiment, the first oil circuit 3, the second oil circuit 4 and the control valve 5 are integrated into a valve plate, which has a high degree of integration and is easy to install.

[0040] Please refer to Figure 2-3 Embodiment 2 provides a valve plate integrated with the control oil circuit embodiment 1. Specifically, the two first switching valves 6, the two second switching valves 7, and the control valve 5 are all integrated on the valve plate of this embodiment, and the internal flow channels are connected by process holes. The process holes are on the outer surface of the valve plate, and threaded holes with recessed grooves are reserved, which are sealed with plugs 9.

[0041] In this embodiment, the connection channel 601 connecting each first switching valve 6 and the first oil cylinder 1 and the connection channel 701 connecting each second switching valve 7 and the first oil cylinder 1 are both reserved with upper and lower interfaces, a total of four groups of eight, respectively corresponding to the B ports of the two first switching valves 6 and the two second switching valves 7. The number of connection channels is set to more than one, and each group of interfaces includes both threaded and flange interfaces, which can facilitate the connection of pipelines.

[0042] Embodiment 3 provides a die-casting machine, comprising the valve plate provided in embodiment 2, and also comprising a neutron and an ejector pin. The first oil cylinder 1 drives the neutron, and the second oil cylinder 2 drives the ejector pin.

[0043] Among them, core and ejector are commonly used existing technologies in the field of die casting. Core, also known as core pulling mechanism, is used to make the molded part that hinders the demoulding of the die casting detach from the die casting before the mold opening action is completed. Ejector is used to open and close the mold and eject the casting.

[0044] Generally, since the neutron cylinder needs to be frequently exposed to a working environment full of impurities and dust, the hydraulic medium is easily contaminated during the frequent movement of the neutron cylinder. In addition, during the process of changing the mold, the frequent removal and installation of the neutron oil pipeline can easily mix the surrounding impurities into the hydraulic system. Once the hydraulic medium is contaminated, it will not only cause frequent blockage of the oil filter, but also cause the solenoid valve to stick, seriously affecting the long-term safe production of the system.

[0045] The first oil tank, i.e. the main system power unit, supplies oil to the neutron function and other functions such as ejector pins as a single system, and a single hydraulic medium is used in the system. In the dual system state, the neutron function and other hydraulic functions are supplied with oil separately by the first oil tank and the second oil tank, i.e. different power units, and different types and cleanliness of hydraulic media can be used at the same time, avoiding contamination caused by mixing of hydraulic media between the neutron system and the main system.

[0046] In this embodiment, the first switching valve 6 and the second switching valve 7 are both cartridge valves, that is, a two-way cartridge valve. The cartridge valve has a high degree of modular design and integration capability, allowing flexible configuration to meet the diverse needs of different hydraulic systems for flow and pressure control, while ensuring the high efficiency and reliability of the system, such as hydraulic presses, plastic forming machinery, die-casting machines and other fields. In other embodiments, the first switching valve 6 and the second switching valve 7 should be selected according to the actual pressure and flow, and the appropriate quantity and size should be selected. For example, when the neutron driven by the first oil cylinder 1 does not require high pressure and flow of the system, the first switching valve 6 can be set as a solenoid valve. Generally, the bottom of the two-way cartridge valve is port A, and the side is port B, both of which are connected to the working oil circuit. The top of the two-way cartridge valve is port C, which is connected to the pilot control oil circuit. When the pilot control oil circuit of the two-way cartridge valve is connected to the high-pressure main oil circuit, the two-way cartridge valve is in a closed state, and port A and port B are disconnected; when the pilot control oil circuit of the two-way cartridge valve is connected to the return oil circuit, the two-way cartridge valve is in an open state, and port A and port B are connected. In this embodiment, the control valve 5 controls the first switching valve 6 and the second switching valve 7 by controlling the opening and closing of the pilot control oil circuit.

[0047] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present utility model.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0049] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementation methods, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A control oil circuit for switching between single and double systems, characterized in that: include: First fuel tank; A second oil tank; a first oil cylinder (1); a second oil cylinder (2); a first oil circuit (3) connected to the first oil tank for driving the first oil cylinder (1), the first oil circuit (3) being provided with a first switching valve (6) for controlling the connection and disconnection between the first oil tank and the first oil cylinder (1); a second oil circuit (4) connected to the second oil tank for driving the first oil cylinder (1) and the second oil cylinder (2), the second oil circuit (4) being provided with a second switching valve (7) for controlling the connection and disconnection between the second oil tank and the first oil cylinder (1); and also comprising a control valve (5) for controlling the opening and closing states of the first switching valve (6) and the second switching valve (7) to be opposite.

2. The control oil circuit according to claim 1, characterized in that: A three-position four-way reversing valve (8) is provided in front of each of the first oil cylinder (1) and the second oil cylinder (2).

3. The control oil circuit according to claim 1, characterized in that: The control valve (5) is a solenoid valve.

4. The control oil circuit according to claim 3, characterized in that: When the control valve (5) loses power, the first switching valve (6) is controlled to be opened and the second switching valve (7) is controlled to be closed; when power is supplied, the first switching valve (6) is controlled to be closed and the second switching valve (7) is controlled to be opened.

5. The control oil circuit according to any one of claims 1 to 4, characterized in that: The first oil circuit (3), the second oil circuit (4) and the control valve (5) are integrated into a valve plate.

6. A valve plate, characterized in that: Integrate the control oil circuit as described in claim 5.

7. The valve plate according to claim 6, characterized in that The number of the connecting channel between each of the first switching valves (6) and the first oil cylinder (1) and the number of the connecting channel between each of the second switching valves (7) and the first oil cylinder (1) are both more than one.

8. A die casting machine, characterized in that: It comprises the control oil circuit, the neutron and the ejector as described in any one of claims 1 to 5; the first oil cylinder (1) drives the neutron, and the second oil cylinder (2) drives the ejector.

9. The die casting machine according to claim 8, characterized in that: The first switching valve (6) is a cartridge valve or a solenoid valve.

10. The die casting machine according to claim 8, characterized in that The second switching valve (7) is a cartridge valve.

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