Injection control combination valve of injection molding machine

Abstract

The invention belongs to the field of injection molding machine hydraulic control, and particularly relates to an injection molding machine injection control combination valve which comprises a main valve body of an integrated casting structure, the main valve body is provided with a port P, a port T and an external working oil port, an installation boss is arranged at the upper end of the main valve body, and a first electromagnetic reversing valve and an electro-hydraulic reversing valve are installed on the installation boss; the lower end of the main valve body is provided with a first mounting body, an MP port and a second electromagnetic directional valve for controlling the pre-molding motor; the external working oil ports comprise a port A1, a port B1, a port A2, a port B2, a port B2G, a port A3 and a port B3, and the first electromagnetic directional valve controls connection and disconnection of the port P, the port A3 and the port B3 through the built-in oil duct; the electro-hydraulic directional control valve drives the main valve element to move, the port P is connected with the port A1 and the port A2 or the port B1 and the port B2 through a main valve element hole oil channel, a second installation body is arranged on the upper end face of the main valve body, and an electromagnetic ball valve and a proportional overflow valve are arranged on the second installation body in an overlapped mode. The valve group has the beneficial effects that the manufacturing cost is reduced, and the valve group has higher flexibility and compactness when being mounted on equipment.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic control of injection molding machines, and in particular relates to an injection control combination valve for injection molding machines. Background Art

[0002] Injection molding machines are widely used in the plastics processing industry, primarily for processing various thermoplastics and thermosetting plastics into plastic products of various shapes. The hydraulic system is the key power and control component of the injection molding machine, providing power support and precise motion control for each movement of the machine.

[0003] The injection molding machine is the core equipment for the production of plastic products, and its injection control accuracy directly affects product quality and production efficiency. The injection control valve of a traditional injection molding machine usually adopts a split structure, and each functional module is installed independently, which leads to a complex system, cumbersome oil circuit connection, difficult maintenance, and easy impact on injection stability due to oil circuit leakage or pressure fluctuations. In addition, the existing valve bodies mostly adopt welding or splicing processes, which have many casting defects, insufficient pressure bearing capacity and other problems, and are difficult to meet the requirements of high-precision and high-response speed injection molding processes. Therefore, there is an urgent need for an injection control valve with high integration, compact structure and precise control to simplify the system layout, improve reliability, and adapt to high performance requirements under complex working conditions. The present invention is mainly aimed at improving the structure of the hydraulic system control valve group. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art and achieve the above-mentioned purpose, the present invention provides an injection control combination valve for an injection molding machine, comprising a main valve body, a core hole being arranged in the main valve body, a main valve core being arranged in the core hole, the main valve body being provided with a P port, a T port and an external working oil port, the main valve body being an integral casting structure, the P port and the T port being arranged in the front of the main valve body, a mounting boss being formed on the upper end of the main valve body by casting, a first electromagnetic reversing valve for controlling the advance and retreat of the oil cylinder of the seat and an electro-hydraulic reversing valve for controlling the reversal of the main valve core being sequentially mounted on the mounting boss; the lower end of the main valve body The first end of the main valve body is provided with a first mounting body, which is provided with an MP port and a second electromagnetic reversing valve for controlling the reversing of the pre-plasticizing motor; the external working oil ports include ports A1, B1, A2, B2, and B2G arranged on the rear side of the main valve body, and ports A3 and B3 arranged on the front side of the main valve body. The control oil of the first electromagnetic reversing valve is connected to ports A3 and B3 through an oil passage arranged in the main valve body. The reversing of the first electromagnetic reversing valve causes port P to connect to port A3, port B3 to connect to port T, or port P to connect to port B3, and port A3 to connect to port T. The electro-hydraulic directional valve drives the main valve core to move by reversing the pilot valve, controlling the P port to connect to the A1 port, A2 port or the B1 port, B2 port through the oil channel set in the core hole of the main valve body. A second mounting body is vertically set on one side of the upper end face of the main valve body close to the A1 port and the B1 port, and an electromagnetic ball valve and a proportional relief valve are superimposed on the second mounting body.

[0005] A left T chamber, a left working chamber, a middle pressure chamber, a right working chamber, a right T chamber and spring chambers on the left and right sides are cast and connected along the core hole of the main valve body. A main rib body is provided in the main valve body, and a first communicating chamber is provided in the main rib body. The first communicating chamber connects the left T chamber and the right T chamber. The middle pressure chamber connects to the P port, and the right T chamber connects to the T port. The left working chamber is connected to the external working oil ports B1 and B2, and the right working chamber is connected to the external working oil ports A1 and A2. The A2 port is provided on the side of the A1 port and is connected to the A1 port. The B2 port is provided on the side of the B1 port and is connected to the B1 port. The A1 port and the A2 port are respectively connected to the rodless chambers of two parallel injection cylinders, and the B1 port and the B2 port are respectively connected to the rod chambers of two parallel injection cylinders.

[0006] A first socket is provided in the first mounting body, a first valve sleeve and a first valve core are provided in the first socket, an MP port connected to the first socket is provided on one side of the mounting body, and a cover plate is provided on the outer end of the other side. A second electromagnetic reversing valve for controlling the reversing of the pre-plasticizing motor is provided on the cover plate, and the P port is connected to the first socket.

[0007] A second jack is provided in the second mounting body, the second jack is communicated with the core hole and the B1 port respectively, a second valve sleeve and a second valve core are provided in the second jack, and the second jack is controlled and connected to the proportional relief valve via the electromagnetic ball valve.

[0008] The mounting boss is provided with K1P hole, K1T hole, K1A hole, K1B hole, K2P hole, K2T hole, K2A hole, K2B hole; the cover plate is provided with K3P hole, K3T hole, K3C hole; the main valve body is provided with process holes: process hole 1, process hole 2, process hole 3, process hole 4, process hole 5, process hole 6, process hole 7, process hole 8, process hole 9; the K1P hole is connected to the medium pressure chamber, and the K1A hole and the K1B hole are connected to the spring chambers at both ends of the main valve core through the connecting hole 1 and the connecting hole 2 provided in the main rib body respectively. The K1T hole is connected to the first communicating chamber; the PG port is connected to the K1P hole through the process hole one; the K2P hole is connected to the medium pressure chamber, the K2A hole is connected to the A3 port, the K2B hole is connected to the B3 port, the K2T hole is connected to the T port through the process hole two, and the B2G port is connected to the B1 port, the B2 port and the left working chamber through the process hole three; the K3P port is connected to the first jack through the process hole four and the process hole five, the K3T port is connected to the right T chamber through the process holes six, seven, eight and nine, and the K3C port is connected to the first jack.

[0009] The main valve body is also provided with an MT port near the T port, the MT port is connected to the T port, and the MP port and the MT port are respectively connected to the pre-plasticizing motor control.

[0010] The solenoid ball valve is provided with a Ty port connected to the external oil tank.

[0011] A hydraulically controlled one-way valve is also stacked between the first electromagnetic reversing valve and the mounting boss.

[0012] All the internal oil passages of the main valve body are smoothly transitioned by casting.

[0013] An integrally cast valve body is used in which valves with the same functions are inserted, and oil ports with the same functions are set. The positions of the functional valves and oil ports can be adjusted freely on six surfaces.

[0014] The present invention has the following features and beneficial effects: 1. Reduced manufacturing costs; 2. Greater flexibility and compactness when installing the valve assembly on the equipment. Through its integrally cast main valve body structure and integrated oil circuit design, the present invention significantly simplifies the layout of the injection molding machine's injection control system, reduces the risk of oil circuit leakage, and improves system response speed and injection accuracy. The coordinated control of the electromagnetic reversing valve and proportional relief valve enables precise pressure regulation to meet the molding requirements of different workpieces. The modular mounting boss and socket-type valve core design facilitate maintenance and replacement, improving the reliability and maintainability of the equipment and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the main valve body of the present invention; Figure 3 It is a left side view of the present invention; Figure 4 for Figure 3 Cross-sectional view at AA in the middle; Figure 5 for Figure 3 Cross-sectional view at the middle BB; Figure 6 for Figure 3 Cross-sectional view at CC; Figure 7 This is a schematic diagram of the cover structure of the present invention; Figure 8 This is a rear view of the main valve body of the present invention; Figure 9 for Figure 8 Cross-sectional view at DD in the middle; Figure 10 This is a working principle diagram of the present invention.

[0016] In the figure: 1-main valve body; 10-main valve core; 101-left T chamber; 102-left working chamber; 103-intermediate pressure chamber; 104-right working chamber; 105-right T chamber; 106-spring chamber; 107-first connecting chamber; 109-connecting hole 1; 110-connecting hole 2; 11-mounting boss; 111-process hole 1; 112-process hole 2; 113-process hole 3; 114-process hole 4; 115-process hole 5; 116-process hole 6; 117-process hole 7; 118-process hole 8 ;119-process hole nine;12-first mounting body;120-first plug hole;13-second mounting body;130-second plug hole;14-cover plate;2-electro-hydraulic reversing valve;3-first solenoid reversing valve;4-second solenoid reversing valve;5-proportional relief valve;6-hydraulic controlled one-way valve;7-solenoid ball valve;81-first valve sleeve;82-first valve core;83-second valve sleeve;84-second valve core;91-pre-plasticizing motor;92-seat advance and retreat cylinder;93-injection cylinder;94-working machine base;95-material silo. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] like Figure 1-10As shown, an injection control combination valve for an injection molding machine includes a main valve body 1, a core hole is provided in the main valve body, a main valve core 10 is provided in the core hole, the main valve body 1 is provided with a P port, a T port and an external working oil port, the main valve body 1 is an integral casting structure, the P port and the T port are provided in the front of the main valve body 1, and a mounting boss 11 is formed by casting at the upper end of the main valve body 1, on which a first electromagnetic reversing valve 3 for controlling the advance and retreat oil cylinder 6 of the seat and an electro-hydraulic reversing valve 2 for controlling the reversing of the main valve core 10 are sequentially mounted; a first mounting body 12 is provided at the lower end of the main valve body 1, and the first mounting body 12 is provided with an MP port and a second electromagnetic reversing valve 4 for controlling the reversing of the pre-plasticizing motor 91; the external working oil ports include A1 port, B1 port, A2 port, B2 port, B2G port provided in the rear of the main valve body and A3 port and B3 port provided in the front of the main valve body. The electro-hydraulic directional valve 2 drives the main valve core through the switching of the pilot valve. The control port P connects to ports A1 and A2, or ports B1 and B2, via an oil channel provided within the core bore of the main valve body. A second mounting body 13 is vertically mounted on the upper end surface of the main valve body, near ports A1 and B1. A solenoid ball valve 7 and a proportional relief valve 5 are superimposed on this second mounting body 13. The main valve body also has an MT port near port T, which communicates with port T. Ports MP and MT are respectively connected to the pre-molding motor 91. A Ty port is provided on the solenoid ball valve 7, which communicates with the external oil tank. A hydraulically controlled check valve 6 is superimposed between the first solenoid directional valve 3 and the mounting boss 11. The integral casting structure enhances the valve body's strength and reduces the risk of leakage.

[0019] like Figure 2 、 10 As shown, the control oil of the first electromagnetic reversing valve 3 is connected to the A3 port and the B3 port through the oil channel provided in the main valve body. The first electromagnetic reversing valve 3 is reversed to realize the following two oil circuit connection modes: Method 1: Connect port P to port A3, and port B3 to port T; Method 2: Connect port P to port B3, and port A3 to port T.

[0020] like Figure 3 、 4As shown in , 8 and 10, a left T chamber 101, a left working chamber 102, a middle pressure chamber 103, a right working chamber 104, a right T chamber 105 and spring chambers 106 on the left and right sides are cast and connected along the core hole of the main valve body 1. The main valve body 1 is provided with a main rib body, and a first communicating chamber 107 is provided in the main rib body. The first communicating chamber 107 communicates with the left T chamber 101 and the right T chamber 105, the middle pressure chamber 103 is connected to the P port, and the right T chamber 105 is connected to the T port. The left working chamber 102 is connected to the external working oil ports B1 and B2, and the right working chamber 104 is connected to the external working oil ports A1 and A2. The A2 port is arranged on the side of the A1 port and is connected to the A1 port, and the B2 port is arranged on the side of the B1 port and is connected to the B1 port. The A1 port and the A2 port are respectively connected to the rodless chambers of two parallel injection cylinders, and the B1 port and the B2 port are respectively connected to the rod chambers of two parallel injection cylinders.

[0021] like Figure 1 、 3 As shown in Figures 4 and 7, a first socket 120 is provided in the first mounting body 12, and a first valve sleeve 81 and a first valve core 82 are provided in the first socket 120. An MP port communicating with the first socket 120 is provided on one side of the mounting body, and a cover plate 14 is provided on the outer end portion of the other side. A second electromagnetic reversing valve 4 for controlling the reversing of the pre-plasticizing motor 91 is provided on the cover plate 14, and the P port is communicated with the first socket 120.

[0022] like Figure 1 、 2 As shown in Figures 3, 5, 8 and 9, a second jack 130 is provided in the second mounting body 13. The second jack 130 is connected to the core hole and the B1 port respectively. A second valve sleeve 83 and a second valve core 84 are provided in the second jack 130. The second jack 130 is controlled and connected to the proportional relief valve 5 via the electromagnetic ball valve 7.

[0023] The mounting boss 11 is provided with a K1P hole, a K1T hole, a K1A hole, a K1B hole, a K2P hole, a K2T hole, a K2A hole, and a K2B hole; the cover plate is provided with a K3P hole, a K3T hole, and a K3C hole; the main valve body is provided with process holes: process hole 111, process hole 2 112, process hole 3 113, process hole 4 114, process hole 5 115, process hole 6 116, process hole 7 117, process hole 8 118, and process hole 9 119; the K1P hole is connected to the medium pressure chamber 103, and the K1A hole and the K1B hole are connected to the spring chambers 106 at both ends of the main valve core through the connecting holes 109 and 110 provided in the main rib body 10 respectively. The K1T hole is connected to the first communicating chamber 107; the PG port is connected to the K1P hole through the process hole 111; the K2P hole is connected to the medium pressure chamber 103, the K2A hole is connected to the A3 port, the K2B hole is connected to the B3 port, the K2T hole is connected to the T port through the process hole 2 112, and the B2G port is connected to the B1 port, the B2 port and the left working chamber 102 through the process hole 3 113; the K3P port is connected to the first jack through the process hole 4 114 and the process hole 5 115, the K3T port is connected to the right T chamber 105 through the process hole 6 116, the process hole 7 117, the process hole 8 118 and the process hole 9 119, and the K3C port is connected to the first jack 120.

[0024] like Figure 10 As shown, the working cycle of the injection combination valve is as follows: 1. YV1 is energized, the seat advance and retreat cylinder 92 extends, and the working machine base 94 enters the working position; 2. YV6 is energized, the pre-plasticizing motor 91 rotates, and the material enters the hopper 95; 3. When YV4 is energized, the injection cylinder 93 retracts, the injection mechanism extends, and the injection molding machine completes the injection. At this time, YV5 is energized synchronously, and YV7 sets the injection pressure value according to different workpieces to ensure that the parts are completely molded; 4. YV3 is energized, the injection cylinder 93 extends, and the injection mechanism retracts; 5. YV2 is energized, the seat advance and retreat cylinder 92 retracts, and the working machine base 94 exits the working position; entering the next working cycle.

[0025] An integrally cast valve body is used and valves with the same functions are inserted therein, and oil ports with the same functions are set. As long as the overall function of the valve can be achieved and the customer's final installation and connection requirements are met, the positions of the functional valves and oil ports can be adjusted at will on six sides. In the embodiments provided in this application, it should be understood that in the disclosed device and method, the main P port, T port, MP port, MT port and the external working oil ports A1 port, B1 port, A2 port, B2 port, B2G port, A3 port, B3 port, and Ty port on the main valve body can be opened by setting them in other directions, which also falls within the scope of protection of the present invention. There are multiple options for the arrangement and direction of the openings. Similarly, the various valves inserted in the combination valve can also have a variety of different models. Depending on the different models, the corresponding oil port positions may be slightly adjusted, but the overall layout remains unchanged. As long as an integrally cast valve body is used and valves with the same functions as in the embodiment are inserted therein, they fall within the scope of protection of this patent.

[0026] The above description is merely a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible in the present application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An injection control combination valve for an injection molding machine, comprising a main valve body (1), a core hole being provided in the main valve body (1), a main valve core (10) being provided in the core hole, the main valve body (1) being provided with a P port, a T port and an external working oil port, and characterized in that: The main valve body (1) is an integral casting structure, the P port and the T port are arranged in the front direction of the main valve body (1), the upper end of the main valve body (1) is formed by casting to form a mounting boss (11), and the mounting boss (11) is sequentially mounted with a first electromagnetic reversing valve (3) for controlling the forward and backward oil cylinder (92) of the control seat and an electro-hydraulic reversing valve (2) for controlling the reversing of the main valve core (10); the lower end of the main valve body (1) is provided with a first mounting body (12), the first mounting body (12) is provided with an MP port and a second electromagnetic reversing valve (4) for controlling the reversing of the pre-molding motor (91); the external working oil ports include A1 port, B1 port, A2 port, B2 port, B2G port arranged in the rear direction of the main valve body, and A3 port and B3 port arranged in the front direction of the main valve body; The control oil of the first electromagnetic reversing valve (3) is connected to the A3 port and the B3 port through the oil passage provided in the main valve body. The first electromagnetic reversing valve (3) is switched so that the P port is connected to the A3 port, the B3 port is connected to the T port, or the P port is connected to the B3 port, the A3 port is connected to the T port; The electro-hydraulic directional control valve (2) drives the main valve core to move by reversing the pilot valve, and controls the P port to be connected to the A1 port, the A2 port or the B1 port, the B2 port through the oil passage provided in the core hole of the main valve body. A second mounting body (13) is vertically provided on one side of the upper end face of the main valve body close to the A1 port, the B1 port, and the electromagnetic ball valve (7) and the proportional relief valve (5) are superimposed on the second mounting body (13).

2. The injection molding machine injection control combination valve according to claim 1, characterized in that: A left T chamber (101), a left working chamber (102), a middle pressure chamber (103), a right working chamber (104), a right T chamber (105) and spring chambers (106) on both sides are cast and connected along the core hole of the main valve body (1). The main valve body (1) is provided with a main rib body, and a first connecting chamber (107) is provided in the main rib body. The first connecting chamber (107) is connected to the left T chamber (101) and the right T chamber (105), and the middle pressure chamber (103) is connected to The P port, the right T cavity is connected to the T port, the left working cavity is connected to the external working oil ports B1 and B2, the right working cavity is connected to the external working oil ports A1 and A2, the A2 port is arranged on the side of the A1 port and is connected to the A1 port, the B2 port is arranged on the side of the B1 port and is connected to the B1 port, the A1 port and the A2 port are respectively connected to the rodless cavities of two parallel injection cylinders (93), and the B1 port and the B2 port are respectively connected to the rod cavities of two parallel injection cylinders (93).

3. The injection control combination valve for an injection molding machine according to claim 2, characterized in that: A first socket (120) is provided in the first mounting body (12), a first valve sleeve (81) and a first valve core (82) are provided in the first socket (120), an MP port communicating with the first socket (120) is provided on one side of the mounting body, and a cover plate (14) is provided at the outer end of the other side, a second electromagnetic reversing valve (4) for controlling the reversing of the pre-plasticizing motor (91) is provided on the cover plate (14), and the P port is communicated with the first socket (120).

4. The injection control combination valve for an injection molding machine according to claim 1, characterized in that: A second jack (130) is provided in the second mounting body (13), the second jack (130) being connected to the core hole and the B1 port respectively, a second valve sleeve (83) and a second valve core (84) being provided in the second jack (130), and the second jack (130) being control-connected to the proportional relief valve (5) via the electromagnetic ball valve (7).

5. The injection control combination valve for an injection molding machine according to claim 3, characterized in that: The mounting boss (11) is provided with a K1P hole, a K1T hole, a K1A hole, a K1B hole, a K2P hole, a K2T hole, a K2A hole, and a K2B hole; the cover plate (14) is provided with a K3P hole, a K3T hole, and a K3C hole; the main valve body is provided with process holes: process hole one (111), process hole two (112), process hole three (113), process hole four (114), process hole five (115), process hole six (116), process hole seven (117), process hole eight (118), and process hole nine (119); The K1P hole is connected to the medium pressure chamber (103), the K1A hole and the K1B hole are connected to the spring chambers (106) at both ends of the main valve core through the first connecting hole (109) and the second connecting hole (110) provided in the main rib body (10), respectively, and the K1T hole is connected to the first connecting chamber (107); The PG port is connected to the K1P port through the process port 1 (111); The K2P hole is connected to the medium pressure chamber (103), the K2A hole is connected to the A3 port, the K2B hole is connected to the B3 port, the K2T hole is connected to the T port through the process hole 2 (112), and the B2G port is connected to the B1 port, the B2 port, and the left working chamber (102) through the process hole 3 (113); the K3P port is connected to the first plug hole through the process hole 4 (114) and the process hole 5 (115), the K3T port is connected to the right T chamber (105) through the process hole 6 (116), the process hole 7 (117), the process hole 8 (118), and the process hole 9 (119), and the K3C port is connected to the first plug hole (120).

6. The injection control combination valve for an injection molding machine according to claim 1, characterized in that: The main valve body is also provided with an MT port near the T port, the MT port is communicated with the T port, and the MP port and the MT port are respectively control-connected to the pre-plasticizing motor (91).

7. The injection control combination valve for an injection molding machine according to claim 3, characterized in that: The electromagnetic ball valve (7) is provided with a Ty port connected to an external oil tank.

8. The injection control combination valve for an injection molding machine according to claim 1, characterized in that: A hydraulically controlled one-way valve (6) is also superimposed between the first electromagnetic reversing valve (3) and the mounting boss (11).

9. The injection control combination valve for an injection molding machine according to claim 1, characterized in that: All the internal oil passages of the main valve body are smoothly transitioned by casting.

10. The injection control combination valve for an injection molding machine according to claim 1, characterized in that: An integrally cast valve body is used in which valves with the same functions are inserted, and oil ports with the same functions are set. The positions of the functional valves and oil ports can be adjusted freely on six surfaces.

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