Oil cylinder control system of forging press

Abstract

The utility model provides an oil cylinder control system of a forging press, which comprises a plurality of proportional direction valves, proportional pilot valves, pressure reducing valves and throttle valves, the quantity of the proportional direction valves, the quantity of the proportional pilot valves, the quantity of the pressure reducing valves and the quantity of the throttle valves are the same, the second end of each proportional direction valve is used for being connected with an action oil cylinder of the forging press, the third end of each proportional direction valve is connected with the first end of the corresponding proportional pilot valve, and the second end of each proportional pilot valve is connected with the corresponding pressure reducing valve and the corresponding throttling valve in series and then connected into the pilot oil way. Precise adjustment of pilot pressure and flow is achieved, and the problem of clamping stagnation of a small-drift-diameter proportional direction valve is solved while the large-flow action requirement is met.

Description

A hydraulic cylinder control system for a forging press Technical Field

[0001] This utility model belongs to the field of forging press control technology, specifically relating to a hydraulic cylinder control system for a forging press. Background Technology

[0002] On the manipulator of a large forging press, multiple proportional directional valves are typically used to control the actions of different cylinders. For example, a 10-bore proportional directional valve is used to control the forward and backward lateral movement cylinder, while a 32-bore proportional directional valve is used to control the tilting cylinder. To ensure stable control and fast response of the proportional directional valves, the pilot oil circuit controlling the proportional directional valve's action is externally controlled and separated from the main oil circuit. The flow rate and pressure of the proportional pilot valve are generally set to the highest pressure and flow rate applicable to the system's valves. This can cause smaller-bore proportional directional valves to experience sluggish operation or even jamming during use. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a cylinder control system for a forging press, which controls the pressure and flow of different proportional directional valves by connecting a pressure reducing valve and a throttle valve in series between the proportional pilot valve and the pilot oil circuit, so as to solve the problem that small-diameter proportional directional valves are prone to jamming.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A hydraulic cylinder control system for a forging press includes several proportional directional valves, proportional pilot valves, pressure reducing valves, and throttle valves. The number of proportional directional valves, proportional pilot valves, pressure reducing valves, and throttle valves is the same. The first end of each proportional directional valve is connected in parallel to the main hydraulic circuit. The second end of each proportional directional valve is used to connect to the actuating hydraulic cylinder of the forging press. The third end of each proportional directional valve is connected to the first end of a proportional pilot valve. The second end of each proportional pilot valve is connected in series with a pressure reducing valve and a throttle valve before being connected to the pilot hydraulic circuit.

[0006] Furthermore, the pilot oil circuit includes a pilot oil inlet circuit and a pilot oil return circuit, the pressure reducing valve and the throttle valve are connected in series between the pilot oil inlet circuit and the pilot oil return circuit, and the second end of the proportional pilot valve is connected to the pressure reducing valve and the pilot oil return circuit.

[0007] Furthermore, the first end of the pressure reducing valve is connected to the pilot oil return line, the first end of the throttle valve is connected to the pilot oil inlet line, the second end of the throttle valve is connected in series with the second end of the pressure reducing valve, and the third end of the pressure reducing valve is connected to the second end of the proportional pilot valve.

[0008] Furthermore, the inlet of the proportional pilot valve is connected to a pressure reducing valve, and the outlet of the proportional pilot valve is connected to a pilot oil return line.

[0009] Furthermore, the main oil circuit includes a main oil inlet circuit and a main oil outlet circuit, the main oil inlet of the proportional directional valve is connected to the main oil inlet circuit, and the main oil outlet of the proportional directional valve is connected to the main oil outlet circuit.

[0010] By adopting the above technical solution, this utility model has the following advantages and effects:

[0011] This utility model provides a hydraulic cylinder control system for a forging press. A pressure reducing valve and a throttle valve are connected in series in the pilot oil circuit. By adjusting the pressure of the pressure reducing valve and the flow rate of the throttle valve to the required values ​​of the proportional directional valve, precise regulation of the pilot pressure and flow rate is achieved. With appropriate pilot pressure and pilot flow rate, there will be no excess pressure impacting the proportional directional valve. In this way, the main valve core of the proportional directional valve moves smoothly and without jamming or impact. Furthermore, when the proportional pilot valve is not energized, the pressure in the pilot chamber of the proportional pilot valve becomes zero, thus preventing pressure buildup in the main valve core of the proportional directional valve. This allows the main valve core to effectively return to the zero position under the action of the spring. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the hydraulic cylinder control system of the forging press of this utility model.

[0013] The attached diagram is labeled as follows: 1-Pressure reducing valve, 2-Throttle valve, 3-Proportional pilot valve, 4-Proportional directional valve, 5-Hydraulic cylinder. Detailed Implementation

[0014] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of this utility model. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of this utility model, but are only for illustrating the essential spirit of the technical solution of this utility model.

[0015] As shown in Figure 1, the hydraulic cylinder control system of a forging press according to this utility model includes several proportional directional valves 4, proportional pilot valves 3, pressure reducing valves 1, and throttle valves 2. The number of proportional directional valves 4, proportional pilot valves 3, pressure reducing valves 1, and throttle valves 2 are the same. The first end of each proportional directional valve 4 is connected in parallel to the main hydraulic circuit. The second end of each proportional directional valve 4 is used to connect to the actuating hydraulic cylinder 5 of the forging press. The third end of each proportional directional valve 4 is connected to the first end of a proportional pilot valve 3. The second end of each proportional pilot valve 4 is connected in series with a pressure reducing valve 1 and a throttle valve 2 before being connected to the pilot hydraulic circuit.

[0016] Specifically, the main hydraulic circuit primarily controls the pressure and flow rate of the proportional directional valve 4. Multiple proportional directional valves 4 are connected in parallel to the main hydraulic circuit, each connected to a hydraulic cylinder 5. Different cylinders 5 control different actions of the forging press. The main hydraulic circuit consists of a main hydraulic inlet circuit P and a main hydraulic outlet circuit T. The inlet P1 of each proportional directional valve 4 is connected to the main hydraulic inlet circuit P, the outlet A1 is connected to one end of the hydraulic cylinder, the outlet T1 is connected to the main hydraulic outlet circuit T, and the inlet B1 is connected to the other end of the hydraulic cylinder. The pilot hydraulic circuit has the same number of proportional pilot valves 3 as the proportional directional valves 4. Each proportional directional valve 4 is connected to a corresponding proportional pilot valve 3, which controls the direction of the hydraulic circuit for the corresponding proportional directional valve 4.

[0017] In this utility model, preferably, there are three proportional directional valves 4, three proportional pilot valves 3, three pressure reducing valves 1 and three throttle valves 2. The first ends of the three proportional directional valves 4 are all connected in parallel to the main oil circuit. The second ends of the three proportional directional valves 4 are respectively connected to the front moving cylinder, the rear moving cylinder and the tilting cylinder of the forging press. The third end of each proportional directional valve 4 is connected to a corresponding proportional pilot valve 3. A set of pressure reducing valves 1 and throttle valves 2 connected in series are connected between each proportional pilot valve 3 and the main oil circuit.

[0018] Preferably, the proportional directional valve 4 connected to the front and rear displacement cylinders has an NG10 bore (10mm inner diameter) and the proportional directional valve 4 connected to the tilting cylinder has an NG32 bore (32mm inner diameter).

[0019] Each proportional directional valve 4 has its first end connected to the main valve inlet P1 and the main valve outlet T1. Its second end is connected to the main valve outlet A1 and the main valve outlet B1. The third end is the first directional control end W and the second directional control end N. Each main valve inlet P1 is connected to the main oil inlet circuit P, and its main valve outlet T1 is connected to the main oil outlet circuit T. Specifically, the first proportional directional valve's main valve outlet A1 and main valve outlet B1 are connected to the front-side displacement cylinder; the second proportional directional valve's main valve outlet A1 and main valve outlet B1 are connected to the rear-side displacement cylinder; and the third proportional directional valve's main valve outlet A1 and main valve outlet B1 are connected to the tilting cylinder.

[0020] Furthermore, the pilot oil circuit includes a pilot oil inlet circuit X and a pilot oil return circuit Y. The pressure reducing valve 1 and the throttle valve 2 are connected in series between the pilot oil inlet circuit X and the pilot oil return circuit Y. The second end of the proportional pilot valve 3 is connected to the pressure reducing valve 1 and the pilot oil return circuit Y.

[0021] Specifically, the first end of each proportional pilot valve 3 is the oil inlet outlet A and the oil outlet inlet B, and the second end is the oil inlet inlet C and the oil outlet D. The oil inlet outlet A of each proportional pilot valve 3 is connected to the second directional control end N of the corresponding proportional directional valve 4, the oil outlet inlet B is connected to the first directional control end W of the corresponding proportional directional valve 4, the oil inlet C is connected to the pilot oil inlet X, and the oil outlet D is connected to the pilot oil return Y.

[0022] Pilot pressure oil first passes through each throttle valve 2 in the pilot oil circuit, then enters the corresponding pressure reducing valve 1. After passing through the pressure reducing valve 1, the pilot pressure decreases, and then it enters the corresponding proportional pilot valve 3. When the outlet A side of the inlet oil circuit of the proportional pilot valve 3 is energized, the pilot pressure oil in the pilot oil circuit flows from the pilot oil inlet X through the outlet A side of the inlet oil circuit of the proportional pilot valve 3, pushing the main valve core of the proportional directional valve 4 to move, so that the inlet P1 of the main valve of the proportional directional valve 4 is connected to the outlet A1 of the main valve. At this time, the pressure oil in the main oil circuit enters one end of the cylinder 5 from the main oil inlet P, causing the cylinder 5 to move. Similarly, when the outlet inlet B side of the proportional pilot valve 3 is energized, the pilot pressure oil in the pilot oil circuit flows from the pilot oil inlet X through the outlet inlet B side of the proportional pilot valve 3, pushing the main valve core of the proportional directional valve 4 to move, so that the main valve inlet P1 of the proportional directional valve 4 is connected to the main valve outlet inlet B1. At this time, the pressure oil in the main oil circuit enters the other end of the cylinder 5 from the main oil inlet P, causing the cylinder 5 to return.

[0023] Furthermore, the first end of the pressure reducing valve 1 is connected to the pilot oil return line Y, the first end of the throttle valve 2 is connected to the pilot oil inlet line X, the second end of the throttle valve 2 is connected in series with the second end of the pressure reducing valve 1, and the third end of the pressure reducing valve 1 is connected to the second end of the proportional pilot valve 3.

[0024] Specifically, the inlet C of the proportional pilot valve 3 is connected to the third end of the pressure reducing valve 1, and the outlet D of the proportional pilot valve 3 is connected to the pilot oil return line Y. The pressure reducing valve 1 is also connected to the pilot oil return line Y, and the throttle valve 2 is also connected to the pilot oil inlet line X.

[0025] In use, this utility model allows for the adjustment of appropriate flow rate and pressure through throttle valve 2 and pressure reducing valve 1 to match the corresponding proportional directional valve 4, thereby achieving precise control of different proportional directional valves. While ensuring the large flow rate requirement, it also solves the jamming problem of small-diameter proportional directional valves.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ram control system for a forging press, characterized by, It includes several proportional directional valves, proportional pilot valves, pressure reducing valves, and throttle valves. The number of proportional directional valves, proportional pilot valves, pressure reducing valves, and throttle valves is the same. The first end of each proportional directional valve is connected in parallel to the main oil circuit. The second end of each proportional directional valve is used to connect to the actuating cylinder of the forging press. The third end of each proportional directional valve is connected to the first end of a proportional pilot valve. The second end of each proportional pilot valve is connected in series with a pressure reducing valve and a throttle valve before being connected to the pilot oil circuit.

2. A ram control system for a forging press as defined in claim 1 wherein, The pilot oil circuit includes a pilot oil inlet circuit and a pilot oil return circuit. The pressure reducing valve and the throttle valve are connected in series between the pilot oil inlet circuit and the pilot oil return circuit. The second end of the proportional pilot valve is connected to the pressure reducing valve and the pilot oil return circuit.

3. The hydraulic cylinder control system for a forging press according to claim 2, characterized in that, The first end of the pressure reducing valve is connected to the pilot oil return line, the first end of the throttle valve is connected to the pilot oil inlet line, the second end of the throttle valve is connected in series with the second end of the pressure reducing valve, and the third end of the pressure reducing valve is connected to the second end of the proportional pilot valve.

4. The hydraulic cylinder control system for a forging press according to claim 3, characterized in that, The inlet of the proportional pilot valve is connected to a pressure reducing valve, and the outlet of the proportional pilot valve is connected to a pilot oil return line.

5. The hydraulic cylinder control system for a forging press according to claim 4, characterized in that, The main oil circuit includes a main oil inlet circuit and a main oil outlet circuit. The main oil inlet of the proportional directional valve is connected to the main oil inlet circuit, and the main oil outlet of the proportional directional valve is connected to the main oil outlet circuit.

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