A controlled open fill valve for a quick die press

Abstract

The utility model discloses a control opening type liquid filling valve for fast forging press, including main valve subassembly and outer control oil circuit, the valve body of main valve subassembly is equipped with the spring of valve core and makes it normally closed, and the valve body is equipped with A mouth of intercommunication liquid filling oil tank and B mouth of intercommunication main cylinder, the cover board of valve body upper end is equipped with pilot control oil cavity, and outer control oil circuit includes control oil source, reversing valve and adjustable flow valve, and its oil outlet connects pilot control oil cavity. The utility model discloses through outer control oil circuit initiative drive valve core opening and closing, and the response is quick, and can pass through the speed valve adjustment opening and closing speed, realizes the stable control, effectively avoided main cylinder suction empty and hydraulic impact, promoted the operating speed, stability and reliability of fast forging press.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control components, specifically a controllable opening filling valve for a high-speed forging press. Background Technology

[0002] In the operation of a high-speed forging press, the filling valve is a key component for achieving rapid filling of the main cylinder, directly affecting the equipment's response speed and operational stability. Currently, high-speed forging presses typically use a specially designed large-diameter two-way cartridge check valve as the filling valve, which passively opens and closes based on the pressure difference between the main cylinder and the filling oil tank. For example, during filling, the valve core opens due to its own weight and the pressure difference, and during pressurization, the oil pressure pushes the valve core to close.

[0003] This passive opening structure has obvious drawbacks: First, the opening response is delayed, relying on the pressure difference to reach a preset value before opening, and it cannot actively control the opening timing according to the main cylinder's action requirements, resulting in untimely filling and affecting the speed of the high-speed forging press; second, when the main cylinder descends rapidly, if the filling valve opens late, negative pressure is easily formed in the upper chamber of the main cylinder, causing air to mix into the hydraulic oil, leading to cavitation and system vibration; third, the pressure impact during passive opening is large, which can easily cause pipeline vibration and noise, and long-term operation may damage hydraulic components; finally, its control method is crude and cannot adapt to the flow requirements of different process stages.

[0004] Therefore, it is necessary to design a filling valve structure that can actively control the opening timing, improve response speed, and enhance operational stability. Utility Model Content

[0005] The purpose of this invention is to provide a controlled-opening filling valve for a high-speed forging press. The opening and closing of the filling valve is actively controlled by an external control oil circuit, which solves problems such as response lag, main cylinder air intake, system vibration, and coarse control.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a controlled-opening filling valve for a high-speed forging press, comprising a main valve assembly and an external control oil circuit; the main valve assembly includes a valve body, a valve sleeve is disposed within the valve body, a valve core is assembled within the valve sleeve, a spring is disposed above the valve core, and the spring acts on the valve core to give it a closing tendency; the valve body is provided with an oil inlet A communicating with a filling oil tank and an oil outlet B communicating with the main cylinder of the high-speed forging press; A cover plate is installed on the upper end of the valve body, and a main valve upper control chamber is formed between the cover plate and the upper end of the valve core. A pilot control oil chamber is also provided inside the cover plate. The oil outlet of the external control oil circuit is connected to the pilot control oil chamber. The external control oil circuit includes a control oil source, a reversing valve and an adjustable flow valve. The oil outlet of the control oil source is connected to the oil inlet of the reversing valve through a pipeline. One working oil port of the reversing valve is connected to the pilot control oil chamber through the adjustable flow valve.

[0007] Preferably, the adjustable flow valve includes an opening speed control valve for adjusting the valve core opening speed and a closing speed control valve for adjusting the valve core closing speed; the reversing valve is a two-position four-way solenoid reversing valve, with its inlet port P connected to the control oil source, its return port T connected to the oil tank, its first working port A connected to the pilot control oil chamber through the opening speed control valve, and its second working port B connected to the pilot control oil chamber through the closing speed control valve.

[0008] Preferably, it further includes a sensor for detecting the state of the master cylinder and a PLC control system for controlling the directional valve to be powered on or off based on the sensor signal; the sensor includes a displacement sensor and a pressure sensor disposed on the master cylinder, the signal output terminal of the sensor is connected to the signal input terminal of the PLC control system, and the control output terminal of the PLC control system is connected to the electromagnet of the directional valve.

[0009] Preferably, the lower end of the valve core is provided with a conical sealing structure for sealing with the valve port at the bottom of the valve sleeve.

[0010] Preferably, the valve body is further provided with an F port that communicates with the control chamber of the main valve.

[0011] Preferably, the control oil source is taken from the auxiliary hydraulic system of the high-speed forging press.

[0012] The working principle of this utility model is as follows: When the main cylinder of the high-speed forging press needs to be rapidly lowered for filling, the PLC control system controls the solenoid directional valve to be energized based on sensor signals (such as a displacement sensor detecting a downward command). The directional valve actuates, introducing pressurized oil from the control oil source into the pilot control oil chamber through the opening speed control valve. The pressurized oil acts on the annular surface of the valve core, generating upward hydraulic pressure. When this hydraulic pressure overcomes the preload of the spring and the hydraulic pressure that may exist in the control chamber of the main valve, it pushes the valve core upward, opening the channel between inlet A and outlet B. Hydraulic oil from the filling tank quickly flows into the main cylinder, achieving rapid filling. By opening the speed control valve, the speed at which the control oil enters the pilot control oil chamber can be adjusted, thereby smoothly controlling the opening speed of the valve core and reducing impact.

[0013] When the main cylinder completes filling or requires pressurization or pressure holding, the PLC control system de-energizes the solenoid directional valve. The directional valve resets, connecting the pilot control oil chamber to the oil tank. The oil in the pilot control oil chamber flows back to the oil tank to relieve pressure through the closed speed control valve. The valve core moves downward under the force of the spring, closing the channel between port A and port B. By closing the speed control valve, the pressure relief speed of the pilot control oil chamber can be adjusted, thereby controlling the closing speed of the valve core, achieving smooth closure and avoiding pressure shock.

[0014] The beneficial effects of this utility model are as follows: (1) This utility model actively drives the valve core to open through the external control oil circuit, without waiting for the pressure difference between the main cylinder and the oil tank to be established. The opening response is rapid, which solves the problem of lag in traditional passive opening and improves the speed of fast forging press.

[0015] (2) According to the needs of the main cylinder, the filling valve can be opened in advance before the rapid descent to ensure that the upper chamber of the main cylinder can always be replenished with oil in time, thus avoiding the generation of negative pressure and cavitation.

[0016] (3) This utility model can adjust the opening and closing speed of the valve core by opening and closing the speed regulating valve, thereby realizing the flexible opening and closing of the filling valve, significantly reducing the pressure shock, vibration and noise of the hydraulic system, and improving the system stability and component life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the filling valve of this utility model in the open state.

[0018] Figure 2 This is a schematic diagram of the filling valve of this utility model in the closed state.

[0019] Figure 3 This is a schematic diagram of the hydraulic control principle of the filling valve of this utility model.

[0020] In the diagram: 1. Cover plate; 2. Pilot control oil chamber; 3. Spring; 4. Main valve upper control chamber; 5. Valve core; 6. Valve sleeve; 7. F port; 8. Valve body; 9. Open speed control valve; 10. Close speed control valve; 11. Directional control valve; 12. Master cylinder; 13. Pressure sensor; 14. Displacement sensor. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] like Figures 1 to 3 As shown in the figure, the present invention provides a controllable opening type filling valve for a fast forging press, which mainly consists of a mechanical valve body and a control part.

[0023] The mechanical valve body constitutes the main valve assembly. The valve body 8 serves as the main load-bearing structure, with a valve sleeve 6 press-fitted inside. The valve core 5 is assembled within the valve sleeve 6 and can move axially. A tapered surface is machined at the lower end of the valve core 5 to form a sealing pair with the valve port at the bottom of the valve sleeve 6. A spring 3 is installed above the valve core 5; the preload of the spring 3 keeps the valve core 5 in a closed position, pressing against the valve port. One side of the valve body 8 has an oil inlet A for connecting to a filling oil tank; the other side has an oil outlet B for connecting to the main cylinder 12 of the high-speed forging press. A cover plate 1 is bolted to the upper end of the valve body 8; the space enclosed by the cover plate 1 and the top of the valve core 5 constitutes the upper control chamber 4 of the main valve. A pilot control oil chamber 2 is machined inside the cover plate 1, which is connected to an external control oil pipe through an internal oil passage. An F port 7, communicating with the upper control chamber 4 of the main valve, can also be provided on the valve body 8 for connecting to an external oil circuit as needed.

[0024] The control section is the external control hydraulic circuit. The control oil source can be taken from the existing auxiliary hydraulic system of the high-speed forging press. The control oil source outputs pressurized oil, which is connected to the P port of directional valve 11 via an oil pipe. The T port of directional valve 11 is connected back to the oil tank. The A port of directional valve 11 is connected to the inlet of the opening speed control valve 9 via an oil pipe, and the outlet of the opening speed control valve 9 is connected to the pilot control oil chamber 2 interface on the cover plate 1. The B port of directional valve 11 is connected to the inlet of the closing speed control valve 10 via an oil pipe, and the outlet of the closing speed control valve 10 is also connected to the pilot control oil chamber 2 interface. Both the opening speed control valve 9 and the closing speed control valve 10 are adjustable flow valves.

[0025] To achieve automatic control, the system is also equipped with a PLC control system. A displacement sensor 14 and a pressure sensor 13 are installed on the main cylinder 12 to detect the position, speed, and pressure signals of the main cylinder in real time. The signal lines of the displacement sensor 14 and the pressure sensor 13 are connected to the input module of the PLC control system. The output module of the PLC control system is connected to the electromagnet coil of the solenoid directional valve 11 via control lines.

[0026] The work process is as follows: Fluid filling and opening process: When the fast forging press receives a rapid downward command, the PLC system determines, based on the signal from displacement sensor 14, that the fluid filling valve needs to be opened. The PLC outputs a signal to energize the electromagnet of the solenoid directional valve 11. The directional valve 11 reverses direction, connecting port P and port A. The pressure oil from the control oil source enters the pilot control oil chamber 2 through the directional valve 11 and the opening speed control valve 9. When this thrust is greater than the sum of the preload of spring 3 and the possible oil pressure in the upper control chamber 4 of the main valve, the valve core 5 moves upward, disengaging from the valve port of valve sleeve 6, opening the passage from port A to port B. Under atmospheric pressure or a slight negative pressure, the oil in the fluid filling tank quickly flows into the upper chamber of the main cylinder 12 through port A, the annular gap between valve core 5 and valve sleeve 6, and port B, achieving rapid fluid filling. By adjusting the opening degree of the opening speed control valve 9, the oil inlet speed can be controlled, thereby ensuring smooth opening of valve core 5 and reducing impact.

[0027] Closing Process: When the main cylinder 12 descends to near the workpiece or needs to switch to pressurization, the PLC makes a judgment based on the signals from the displacement sensor 14 and the pressure sensor 13. The PLC controls the directional valve 11 to de-energize. The directional valve 11 resets under the action of the spring, disconnecting port A from port T and connecting port B to port T. At this time, the pressurized oil in the pilot control oil chamber 2 flows back to the oil tank to relieve pressure through the closed speed control valve 10, port B and port T of the directional valve 11. The valve core 5 moves downward under the action of the upper spring 3, and finally its conical surface fits tightly against the valve port of the valve sleeve 6, cutting off the passage between port A and port B, and stopping the filling. The main cylinder 12 enters the pressurization or pressure holding state. By adjusting the opening of the closed speed control valve 10, the depressurization speed of the pilot control oil chamber 2 can be controlled, thereby achieving smooth closing of the valve core 5 and avoiding the impact caused by the sudden increase in main cylinder pressure.

[0028] The key parameters of this utility model are as follows: the maximum filling flow rate can reach 12000L / min; the working temperature range is -20℃ to 80℃; the valve core 5 can be made of 40CrNiMoA material, and the surface is nitrided or hard chrome plated to improve wear resistance; the stiffness coefficient of the spring 3 can be selected as 50N / mm; the response time of the electromagnetic reversing valve 11 is ≤20ms, and the working pressure range is 10-31.5MPa; the control oil source pressure can be set to 25MPa.

[0029] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.

Claims

1. A controlled-opening filling valve for a high-speed forging press, characterized in that: It includes a main valve assembly and an external control oil circuit; the main valve assembly includes a valve body (8), a valve sleeve (6) is provided inside the valve body (8), a valve core (5) is assembled inside the valve sleeve (6), a spring (3) is provided above the valve core (5), and the spring (3) acts on the valve core (5) to make it have a closing tendency; the valve body (8) is provided with an oil inlet A that connects to the filling oil tank and an oil outlet B that connects to the main cylinder (12) of the fast forging press; The upper end of the valve body (8) is equipped with a cover plate (1), and the upper end of the cover plate (1) and the valve core (5) form the upper control chamber (4) of the main valve. The cover plate (1) is also provided with a pilot control oil chamber (2). The oil outlet of the external control oil circuit is connected to the pilot control oil chamber (2). The external control oil circuit includes a control oil source, a reversing valve (11) and an adjustable flow valve. The oil outlet of the control oil source is connected to the oil inlet of the reversing valve (11) through a pipeline. One working oil port of the reversing valve (11) is connected to the pilot control oil chamber (2) through the adjustable flow valve.

2. A controlled-opening filling valve for a high-speed forging press according to claim 1, characterized in that: The adjustable flow valve includes an opening speed control valve (9) for adjusting the opening speed of the valve core (5) and a closing speed control valve (10) for adjusting the closing speed of the valve core (5); the reversing valve (11) is a two-position four-way solenoid reversing valve, with its inlet P port connected to the control oil source, its return port T port connected to the oil tank, its first working port A port connected to the pilot control oil chamber (2) through the opening speed control valve (9), and its second working port B port connected to the pilot control oil chamber (2) through the closing speed control valve (10).

3. A controlled-opening filling valve for a high-speed forging press according to claim 1 or 2, characterized in that: It also includes a sensor for detecting the state of the master cylinder (12) and a PLC control system for controlling the directional valve (11) to be powered on or off according to the sensor signal; the sensor includes a displacement sensor (14) and a pressure sensor (13) installed on the master cylinder (12), the signal output terminal of the sensor is connected to the signal input terminal of the PLC control system, and the control output terminal of the PLC control system is connected to the electromagnet of the directional valve (11).

4. A controlled-opening filling valve for a high-speed forging press according to claim 3, characterized in that: The lower end of the valve core (5) is provided with a conical sealing structure for sealing with the valve port at the bottom of the valve sleeve (6).

5. A controlled-opening filling valve for a high-speed forging press according to claim 4, characterized in that: The valve body (8) is also provided with an F port (7) that communicates with the control chamber (4) of the main valve.

6. A controlled-opening filling valve for a high-speed forging press according to claim 5, characterized in that: The control oil source is taken from the auxiliary hydraulic system of the high-speed forging press.

Images