Hydraulic cylinder on a hydraulic forging press upper beam

Abstract

The utility model relates to a kind of hydraulic cylinder on hydraulic forging machine upper beam, traditional high-power hydraulic forging machine set generally adopts plunger cylinder, all hydraulic cylinders only participate in half work cycle, greatly waste resources, while need to set higher pressure also reduce the service life of hydraulic cylinder.The utility model is single out rod bidirectional action hydraulic cylinder for hydraulic cylinder, its rodless cavity is set as calendering hydraulic cylinder, drive the movable beam downward forging, part of rod cavity is set as return hydraulic cylinder, another part is set as balance hydraulic cylinder, balance hydraulic cylinder is communicated with energy accumulator, so that movable beam is always received upward and suspended, return hydraulic cylinder and balance hydraulic cylinder jointly drive movable beam return.PLC according to the pressure and set pressure instruction different control valve opening and closing in hydraulic circuit, control different calendering hydraulic cylinder calendering.The utility model design novel, structure is reasonable, hydraulic cylinder utilization rate is high, return is fast and pressure is automatically regulated with load and the like advantages.

Description

Technical Field

[0001] This utility model relates to hydraulic cylinders on the upper beam of an uppress hydraulic forging machine, which divides the same hydraulic cylinder into hydraulic cylinders with different functions and arranges them in a reasonable manner, belonging to the field of hydraulic transmission technology. Background Technology

[0002] Traditional high-power hydraulic forging machines typically use plunger cylinders, usually arranged in two sets: one set for the main hydraulic cylinders used for rolling, and the other set for the return stroke cylinders that push the moving beam upwards. All hydraulic cylinders only participate in half a work cycle, resulting in significant resource waste. Furthermore, because only some hydraulic cylinders are involved, they must be made larger, increasing manufacturing costs. The increased size of the hydraulic cylinders also leads to a corresponding increase in the overall size of the forging machine. While methods such as increasing system pressure have been implemented, they still have many drawbacks: firstly, they require high-end hydraulic equipment; secondly, they increase maintenance costs. In summary, existing improvements are not ideal, and further optimization of the hydraulic cylinder configuration on the upper beam is needed. Summary of the Invention

[0003] The purpose of this utility model is to provide a hydraulic cylinder for the upper beam of a hydraulic forging machine, which sets all the working cylinders on the upper beam as bidirectional hydraulic cylinders, so as to achieve the purpose of fast forging speed, low vibration and high reliability.

[0004] A hydraulic cylinder for the upper beam of a hydraulic forging machine includes: an upper beam, a movable beam, a hydraulic cylinder, and a hydraulic circuit. The hydraulic cylinder is fixed to the upper beam, and the hydraulic circuit provides pressurized oil to the hydraulic cylinder. The hydraulic cylinder drives the movable beam to move up and down. The hydraulic cylinder is characterized by:

[0005] The hydraulic cylinder is a single-rod, bi-directional hydraulic cylinder, and there are multiple hydraulic cylinders, which are symmetrically arranged with respect to the center of the upper beam;

[0006] The rodless chamber of the hydraulic cylinder is configured as a rolling hydraulic cylinder, which drives the movable beam to forge downwards;

[0007] The calendering hydraulic cylinders are set to group control, and multiple pressure levels are set according to working conditions. Multiple groups of calendering hydraulic cylinders automatically switch according to the pressure value from small to large or from large to small.

[0008] The rod chamber of the hydraulic cylinder is partly configured as a return hydraulic cylinder and partly configured as a balance hydraulic cylinder. The return hydraulic cylinder drives the movable beam to return upward. The balance hydraulic cylinder is connected to the accumulator, so that the movable beam is always subjected to an upward lifting force and is suspended. The return hydraulic cylinder and the balance hydraulic cylinder jointly drive the movable beam to return.

[0009] The hydraulic circuit of the calendering hydraulic cylinder is equipped with a switching valve, and the opening and closing of the switching valve controls the calendering hydraulic cylinder to forge or follow up.

[0010] Preferably, there are seven hydraulic cylinders.

[0011] Furthermore, one of the seven hydraulic cylinders is positioned at the center of the upper beam, while the other six are positioned around it, with the center lines of two symmetrical hydraulic cylinders lying on the same plane as the center line of the upper beam.

[0012] Furthermore, the rolling hydraulic cylinders are configured according to working conditions, and can be switched to one, two, three, four, five, six, or seven cylinders according to the changes in the resistance of the forgings, and any configuration of the rolling hydraulic cylinders is symmetrical to the center of the upper beam.

[0013] In this invention, all hydraulic cylinders on the upper beam of the hydraulic forging machine are configured as bidirectional hydraulic cylinders. Different pressures are set according to working conditions, and the rolling hydraulic cylinders are automatically controlled to participate in rolling in whole or in part. The rod chamber is configured as a balance hydraulic cylinder and a return hydraulic cylinder. The balance hydraulic cylinder keeps the moving beam in a suspended state by an upward supporting force. When the hydraulic forging machine returns, the balance hydraulic cylinder and the return hydraulic cylinder jointly participate in the return of the moving beam, thereby improving the return response speed of the hydraulic forging machine and reducing the impact.

[0014] This utility model has a novel design, reasonable structure, and advantages such as high hydraulic cylinder utilization, fast return, automatic pressure switching according to load, and low failure rate. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the main sectional structure of this utility model.

[0016] Appendix Figure 2 For the appendix Figure 1 Top view of the structure

[0017] Appendix Figure 3 For the appendix Figure 2 Schematic diagram of the AA section structure.

[0018] Appendix Figure 4 A schematic diagram of the hydraulic circuit for an embodiment of this utility model with a balance hydraulic cylinder.

[0019] In the attached diagram, 1 is the upper beam, 2 is the movable beam, 3 is the hydraulic pump, 4 is the three-position four-way solenoid directional valve, 5 is the accumulator, and a, b, c, d, e, f, and g are hydraulic cylinders. K a K b K c K d K e K f K g The corresponding electromagnetic switch valves are installed on the hydraulic cylinder pressure oil lines of hydraulic cylinders a, b, c, d, e, f, and g. Detailed Implementation

[0020] In this embodiment, seven hydraulic cylinders are installed on the upper beam.

[0021] As attached Figure 1 , 2 As shown in Figures 3 and 4, seven single-rod bidirectional hydraulic cylinders (a, b, c, d, e, f, g) are installed on the upper beam 1. The lower end of each single rod is fixedly connected to the upper part of the movable beam 2. When the right side of the three-position four-way solenoid directional valve 4 is energized, the corresponding control valve K... a K b K c K d K e K f K g When the hydraulic pump 3 is activated, hydraulic oil is pumped into the rodless chambers of the seven hydraulic cylinders (a, b, c, d, e, f, g), pushing the movable beam 2 downwards via the piston and single rod. Due to the constantly changing resistance of the workpiece, the PLC (not shown in the figure) uses pressure sensors (not shown in the figure) to detect different pressures in the hydraulic circuit and instructs different control valves to open. (Appendix) Figure 4 As shown, PLC instruction K a Open, K b K c K d K e K f K g Close, or K b K c Open, K a K d K e K f K g Close or K d K g Open, K a K b K c K e K f Close or K e K f Open, K a K b K c K d K g Close or K a K b K c Open, K d K e K f K g Close or K d K e K f Kg Open, K d K e K f K g Close or K a K d K e K f K g Open, K b K c Close or K b K c K d K e K f K g Open, K a Close or K a K b K c K d K e K f K g All cylinders are fully opened, thereby controlling the number of calendering hydraulic cylinders participating in calendering at different set pressure values.

[0022] The rod chambers of the seven single-rod, double-acting hydraulic cylinders (a, b, c, d, e, f, g) are partially configured as return hydraulic cylinders and partially as balance hydraulic cylinders. (See attached diagram.) Figure 4 As shown, the rod chamber of hydraulic cylinder a is a balance cylinder, and the rod chambers of cylinders b, c, d, e, f, and g are return cylinders. The balance cylinder is connected to the accumulator 5, and there is always a certain pressure inside it, which causes the movable beam to be subjected to an upward lifting force and keep it in a suspended state.

[0023] This embodiment uses seven hydraulic cylinders, but it can also use three, five, or more, as long as the principle of non-eccentric loading is followed, all of which are within the scope of this design.

Claims

1. A hydraulic cylinder on a header of a hydraulic forging machine, comprising: The structure comprises an upper beam, a movable beam, a hydraulic cylinder, and a hydraulic circuit. The hydraulic cylinder is fixed to the upper beam, and the hydraulic circuit provides pressurized oil to the hydraulic cylinder. The hydraulic cylinder drives the movable beam to move up and down. The structure is characterized by: The hydraulic cylinder is a single-rod, bi-directional hydraulic cylinder, and there are multiple hydraulic cylinders, which are symmetrically arranged with respect to the center of the upper beam; The rodless chamber of the hydraulic cylinder is configured as a rolling hydraulic cylinder, which drives the movable beam to forge downwards; The calendering hydraulic cylinders are set to group control, and multiple pressure levels are set according to working conditions. Multiple groups of calendering hydraulic cylinders automatically switch according to the pressure value from small to large or from large to small. The rod chamber of the hydraulic cylinder is partly configured as a return hydraulic cylinder and partly configured as a balance hydraulic cylinder. The return hydraulic cylinder drives the movable beam to return upward. The balance hydraulic cylinder is connected to the accumulator, so that the movable beam is always subjected to an upward lifting force and is suspended. The return hydraulic cylinder and the balance hydraulic cylinder jointly drive the movable beam to return. The hydraulic circuit of the calendering hydraulic cylinder is equipped with a switching valve, and the opening and closing of the switching valve controls the calendering hydraulic cylinder to forge or follow up.

2. A hydraulic cylinder on the upper beam of a hydraulic forging press according to claim 1, characterized in that: The hydraulic cylinders are configured to consist of seven units.

3. A hydraulic cylinder on the upper beam of a hydraulic forging press according to claim 1, characterized in that: The configuration of the rolling hydraulic cylinders is set according to the working conditions, and can be switched to one, two, three, four, five, six, or seven cylinders according to the changes in the resistance of the forging.

4. A hydraulic cylinder on the upper beam of a hydraulic forging machine according to claim 2, characterized in that: One of the seven hydraulic cylinders is located at the center of the upper beam, and the other six are located around it. The center lines of two symmetrical hydraulic cylinders are on the same plane as the center line of the upper beam.

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