Hydraulic oil circuit control system of injection unit

Abstract

The utility model relates to the technical field of oil way control systems, in particular to an injection unit hydraulic oil way control system which comprises a three-position four-way reversing valve and a control valve, a P port of the three-position four-way reversing valve is communicated with an oil inlet, a T port of the three-position four-way reversing valve is communicated with an oil return port, and a T port of the three-position four-way reversing valve is communicated with an oil return port. A port A of the three-position four-way reversing valve is communicated with a front oil port of the injection oil cylinder, a port B of the three-position four-way reversing valve is communicated with a rear oil port of the injection oil cylinder, an input port of the control valve is communicated with the oil inlet, and an output port of the control valve is communicated with the front oil port of the injection oil cylinder. The control valve is communicated between the oil inlet and the front oil port of the injection oil cylinder, the control valve increases the oil inlet amount of the injection oil cylinder when the two-position four-way reversing valve is located at the right position, the injection speed is increased, the productivity is improved, the control module is matched with a stroke hydraulic differential loop when the injection oil cylinder acts, and small flow and high speed are achieved. And the cycle time is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil circuit control systems, in particular to an injection unit hydraulic oil circuit control system. Background Art

[0002] Injection molding machines have been widely used in industrial production. Existing injection molding machines usually inject and feed materials directly through a reversing valve, which has a slow injection feeding speed, increases cycle time, reduces production capacity, increases production cycle, and increases production costs. The traditional method of increasing the injection speed is to increase the displacement of the pump and use a reversing valve or a two-way valve with a large diameter. This operation will increase production costs and take up more space. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the problem that the existing injection molding machines usually directly inject and feed materials through a reversing valve, but the injection and feeding speed is slow, the cycle time is increased, the production capacity is reduced, the production cycle is increased, and the production cost is increased, an injection unit hydraulic oil circuit control system is provided.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an injection unit hydraulic oil circuit control system, comprising a three-position four-way reversing valve and a control valve, wherein the P port of the three-position four-way reversing valve is connected to the oil inlet, the T port of the three-position four-way reversing valve is connected to the oil return port, the A port of the three-position four-way reversing valve is connected to the front oil port of the injection cylinder, the B port of the three-position four-way reversing valve is connected to the rear oil port of the injection cylinder, the input port of the control valve is connected to the oil inlet, the output port of the control valve is connected to the front oil port of the injection cylinder, and a control module is arranged between the rear oil port of the injection cylinder and the B port of the three-position four-way reversing valve, and the control module is used to form a hydraulic differential circuit when the injection cylinder is actuated. Compared with the prior art, this solution connects the control valve between the oil inlet and the front oil port of the injection cylinder. When the two-position four-way reversing valve (6) is in the right position, the control valve increases the oil intake of the injection cylinder, thereby increasing the injection speed and the production capacity. In addition, the control module cooperates with the hydraulic differential circuit when the injection cylinder is actuated to achieve low flow and high speed, thereby reducing the cycle time.

[0005] In order to better control the flow rate of the oil entering the front oil port of the injection cylinder, in some preferred embodiments, a first throttle valve is provided between the A port of the three-position four-way reversing valve and the front oil port of the injection cylinder. The first throttle valve can adjust the flow rate of the oil passing through the A port of the three-position four-way reversing valve and the front oil port of the injection cylinder, which is convenient for the staff to control, meets the use requirements, and improves the applicability of the system.

[0006] In order to ensure that port A of the three-position four-way reversing valve passes through a sufficient flow, in some preferred embodiments, a second throttle valve is provided between port A of the three-position four-way reversing valve and the front oil port of the injection cylinder, and the first throttle valve and the second throttle valve are connected in parallel with each other. The two parallel first throttle valves and the second throttle valves improve the control of the flow, and port A of the three-position four-way reversing valve passes through a sufficient flow.

[0007] In order to realize automatic opening and closing of the control valve, in some preferred embodiments, the port A of the three-position four-way reversing valve is connected to the control port of the control valve. By connecting the port A of the three-position four-way reversing valve to the control port of the control valve, the oil pressure entering the control port can overcome the spring force in the control valve, thereby realizing opening or closing of the control valve.

[0008] In order to better realize the automatic opening and closing of the control valve, in some preferred embodiments, a third throttle valve is provided between the A port of the three-position four-way reversing valve and the control port of the control valve. By providing the third throttle valve between the A port of the three-position four-way reversing valve and the control port of the control valve, the third throttle valve controls the flow entering the control port of the control valve, thus changing the pressure of the control port and the opening and closing pressure of the control valve to meet the use requirements.

[0009] In order to realize the control module, some embodiments are preferably used, wherein the control module includes a two-position four-way reversing valve, wherein the P port of the two-position four-way reversing valve is connected to the rear oil port of the injection cylinder, the A port of the two-position four-way reversing valve is connected to the B port of the three-position four-way reversing valve, and the B port of the two-position four-way reversing valve is connected to the front oil port of the injection cylinder.

[0010] The beneficial effects of the utility model are as follows: when the hydraulic oil circuit control system of the injection unit of the utility model is in use, a control valve is connected between the oil inlet and the front oil port of the injection cylinder. When the two-position four-way reversing valve is in the right position, the control valve increases the oil inlet amount of the injection cylinder, thereby increasing the injection speed and the production capacity. The control module cooperates with the hydraulic differential circuit when the injection cylinder is actuated to achieve low flow and high speed, reduce the cycle time, and avoid the problem that the existing injection molding machine usually directly injects and feeds materials through the reversing valve, which has a slow injection feeding speed, increases the cycle time, reduces the production capacity, increases the production cycle, and increases the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure: 1. three-position four-way reversing valve, 2. control valve, 3. first throttle valve, 4. second throttle valve, 5. third throttle valve, 6. two-position four-way reversing valve. DETAILED DESCRIPTION

[0014] The utility model is further described in detail below in conjunction with the embodiments:

[0015] The present invention is not limited to the following specific implementations. A person skilled in the art can implement the present invention in a variety of other specific implementations according to the content disclosed in the present invention, or any design structure and idea of ​​the present invention with simple changes or modifications shall fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0016] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0018] like Figure 1As shown, a hydraulic oil circuit control system for an injection unit includes a three-position four-way reversing valve 1, a control valve 2 and a control module, wherein the P port of the three-position four-way reversing valve 1 is connected to the oil inlet, the T port of the three-position four-way reversing valve 1 is connected to the oil return port, the A port of the three-position four-way reversing valve 1 is connected to the front oil port of the injection cylinder, the B port of the three-position four-way reversing valve 1 is connected to the rear oil port of the injection cylinder, the input port of the control valve 2 is connected to the oil inlet, the output port of the control valve 2 is connected to the front oil port of the injection cylinder, the control module is arranged between the rear oil port of the injection cylinder and the B port of the three-position four-way reversing valve 1, and the control module is used to form a hydraulic differential circuit when the injection cylinder is actuated.

[0019] A first throttle valve 3 and a second throttle valve 4 are arranged between the A port of the three-position four-way reversing valve 1 and the front oil port of the injection cylinder, and the first throttle valve 3 and the second throttle valve 4 are connected in parallel with each other.

[0020] The port A of the three-position four-way reversing valve 1 is connected to the control port of the control valve 2 , and a third throttle valve 5 is arranged between the port A of the three-position four-way reversing valve 1 and the control port of the control valve 2 .

[0021] The control module includes a two-position four-way reversing valve 6, the P port of the two-position four-way reversing valve 6 is connected to the rear oil port of the injection cylinder, the A port of the two-position four-way reversing valve 6 is connected to the B port of the three-position four-way reversing valve 1, and the B port of the two-position four-way reversing valve 6 is connected to the front oil port of the injection cylinder.

[0022] When the injection of the above-mentioned injection unit hydraulic oil circuit control system is moving forward, the three-position four-way reversing valve 1 is in the right position, and the high-pressure oil is transported to the P port of the three-position four-way reversing valve 1 and the input port of the control valve 2 through the oil inlet, and is transported to the first throttle valve 3, the second throttle valve 4 and the third throttle valve 5 through the A port of the three-position four-way reversing valve 1. The first throttle valve 3, the second throttle valve 4 and the third throttle valve 5 play a role in regulating the flow rate and thus regulating the pressure. A part of the oil reaches the front oil port of the injection cylinder through the first throttle valve 3 and the second throttle valve 4, and the other part of the oil enters the control port of the control valve 2 through the third throttle valve 5. When the oil pressure at the output port of the control valve 2 is greater than the oil pressure + spring force of the control port, the control valve 2 opens, and the other part of the oil reaches the front oil port of the injection cylinder through the output port of the control valve 2, thereby forming a confluence, which increases the injection speed of the injection cylinder.

[0023] Furthermore, the two-position four-way reversing valve 6 at the control module can further control the injection cylinder to form a hydraulic differential circuit, further improving the action speed of the injection cylinder, achieving low flow and high speed, and reducing the cycle time.

[0024] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An injection unit hydraulic oil circuit control system, characterized in that: It comprises a three-position four-way reversing valve (1) and a control valve (2), wherein the P port of the three-position four-way reversing valve (1) is connected to the oil inlet, the T port of the three-position four-way reversing valve (1) is connected to the oil return port, the A port of the three-position four-way reversing valve (1) is connected to the front oil port of the injection cylinder, the B port of the three-position four-way reversing valve (1) is connected to the rear oil port of the injection cylinder, the input port of the control valve (2) is connected to the oil inlet, the output port of the control valve (2) is connected to the front oil port of the injection cylinder, and a control module is arranged between the rear oil port of the injection cylinder and the B port of the three-position four-way reversing valve (1), and the control module is used to form a hydraulic differential circuit when the injection cylinder is actuated; The control module comprises a two-position four-way reversing valve (6), the P port of the two-position four-way reversing valve (6) being connected to the rear oil port of the injection cylinder, the A port of the two-position four-way reversing valve (6) being connected to the B port of the three-position four-way reversing valve (1), and the B port of the two-position four-way reversing valve (6) being connected to the front oil port of the injection cylinder.

2. The injection unit hydraulic oil circuit control system according to claim 1, characterized in that: A first throttle valve (3) is provided between the A port of the three-position four-way reversing valve (1) and the front oil port of the injection cylinder.

3. The injection unit hydraulic oil circuit control system according to claim 2, characterized in that: A second throttle valve (4) is provided between the A port of the three-position four-way reversing valve (1) and the front oil port of the injection cylinder, and the first throttle valve (3) and the second throttle valve (4) are connected in parallel with each other.

4. An injection unit hydraulic oil circuit control system according to claim 2 or 3, characterized in that: The port A of the three-position four-way reversing valve (1) is connected to the control port of the control valve (2).

5. The injection unit hydraulic oil circuit control system according to claim 4, characterized in that: A third throttle valve (5) is provided between the port A of the three-position four-way reversing valve (1) and the control port of the control valve (2).

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