Rapid filling system and method for multiple main working plunger cylinders of large-scale water-to-oil die forging press

Abstract

The present invention belongs to the technical field of metallurgical equipment, and specifically relates to a fast liquid filling system and method for multiple main working plunger cylinders of a large-scale water-to-oil die forging press. The present invention is based on two liquid filling tanks and eight main working plunger cylinders on the original die forging press, and organically forms a fast liquid filling system for multiple main working plunger cylinders of a large-scale water-to-oil die forging press by adding two oil tanks, eight liquid filling valves, four low-pressure compensators, a liquid filling tank oil replenishing device and a liquid filling tank oil draining device, so that the eight main working plunger cylinders of the upgraded 300MN die forging press can be quickly filled and drained when the moving crossbeam is quickly moved, effectively improving the speed and stability of the die forging press operation.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a fast liquid filling system and method for multiple main working plunger cylinders of a large-scale water-to-oil die forging press. Background Art

[0002] The 300MN die-forging hydraulic press, a national treasure equipment built in the 1970s, uses 8 main working plunger cylinders to drive the moving beam. After years of use, especially the rapid development of science and technology in recent years, the 300MN die-forging hydraulic press has become outdated, with prominent shortcomings in hydraulic drive, high energy consumption, poor operating accuracy, and poor working environment of the whole machine, making it urgent to upgrade the equipment. After upgrading to an oil press, the eight main working plunger cylinders had a large amount of liquid instantly pouring in when the moving beam descended rapidly and a large amount of liquid instantly discharged when it rose rapidly, which became a control problem. Summary of the invention

[0003] The present invention provides a rapid liquid filling system and method for multiple main working plunger cylinders of a large water-to-oil die forging press, with the aim of enabling the eight main working plunger cylinders of an upgraded 300MN die forging press to be rapidly filled and drained when the moving beam moves rapidly, thereby improving the operating speed and stability of the press.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The water-to-oil large-scale die forging press has multiple main working plunger cylinders and a rapid filling system, which includes at least two filling tanks and eight main working plunger cylinders; it also includes two oil tanks, eight filling valves, four low-pressure compensators, a filling tank oil replenishing device and a filling tank oil draining device; the upper ports of the eight main working plunger cylinders are respectively provided with filling valves; the four low-pressure compensators are fixed on the upper platform of the die forging press, and the four low-pressure compensators are connected through hydraulic pipelines; every two of the eight filling valves are respectively fixedly connected to a low-pressure compensator through hydraulic pipelines; the two filling tanks It is placed in a pit beside the die forging press and is connected to four low-pressure compensators located on the upper part of the die forging press through hydraulic pipes; the two liquid-filling tanks and the two oil tanks are respectively arranged in parallel, and a liquid-filling tank oil-replenishing device and a liquid-filling tank oil-draining device are arranged between the two liquid-filling tanks and the two oil tanks, the input end of the liquid-filling tank oil-replenishing device is connected to the two parallel oil tanks, the output end of the liquid-filling tank oil-replenishing device is connected to the two parallel liquid-filling tanks, the input end of the liquid-filling tank oil-draining device is connected to the two parallel liquid-filling tanks, and the output end of the liquid-filling tank oil-replenishing device is connected to the two parallel oil tanks.

[0006] The volume of the two liquid-filled tanks is 35m 3 ~40m 3 .

[0007] The hydraulic pipeline is a telescopic pipeline.

[0008] The arrangement height of the four low-pressure compensators is higher than the height of the eight filling valves.

[0009] It also includes a PLC controller; the PLC controller is connected to the eight main working plunger cylinders with electrical signals respectively.

[0010] The liquid filling tank oil replenishing device includes a screw pump, a filter and a one-way valve; the screw pump oil suction port is connected to the oil tank, the screw pump outlet is connected to the filter inlet, the filter outlet is connected to the one-way valve inlet, and the one-way valve outlet is connected to the liquid filling tank.

[0011] The liquid filling tank oil discharge device comprises an electromagnetic oil discharge valve and an overflow valve; the electromagnetic oil discharge valve and the overflow valve are connected in parallel, the inlets of the electromagnetic oil discharge valve and the overflow valve are connected to the liquid filling tank, and the outlets of the electromagnetic oil discharge valve and the overflow valve are connected to the oil tank.

[0012] A rapid liquid flushing method for a rapid liquid filling system of a multi-main working plunger cylinder of a large-scale water-to-oil forging press comprises the following steps:

[0013] Step 1: When the moving beam of the die forging press descends rapidly, proceed to step 2; when the die forging press is pressurizing, proceed to step 3; when the moving beam rises rapidly, proceed to step 4:

[0014] Step 2: The PLC controller controls all eight filling valves to open, and the four low-pressure compensators are directly connected to the eight main working plunger cylinders. The oil of the four low-pressure compensators directly and quickly enters the eight main working plunger cylinders, completing the rapid descent of the moving beam.

[0015] Step 3: The PLC controller controls the eight filling valves to close, and the high-pressure oil enters the eight main working plunger cylinders through the pipeline to complete the die forging of the forging;

[0016] Step 4: The PLC controller controls the eight filling valves to open as well. The four low-pressure compensators and the eight main working plunger cylinders are directly connected again. The oil in the eight main working plunger cylinders is quickly pressed back into the low-pressure compensators due to the moving beam, completing the rapid rise of the moving beam.

[0017] Beneficial effects:

[0018] The present invention is based on the two filling tanks and eight main working plunger cylinders on the original die forging press, and organically forms a water-to-oil large-scale die forging press multi-main working plunger cylinder rapid filling system by adding two oil tanks, eight filling valves, four low-pressure compensators, a filling tank oil replenishing device and a filling tank oil draining device. The eight main working plunger cylinders of the upgraded 300MN die forging press can be quickly filled and drained when the moving crossbeam is quickly moved, thereby effectively improving the speed and stability of the die forging press operation.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] In the figure: 1-oil tank; 2-liquid filling tank; 3-liquid filling valve; 4-low pressure compensator; 5-liquid filling tank oil replenishing device; 6-liquid filling tank oil draining device; 7-moving crossbeam; 8-main working plunger cylinder. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] Reference Figure 1The water-to-oil large-scale die forging press multi-main working plunger cylinder rapid filling system shown in the figure includes at least two filling tanks 2 and eight main working plunger cylinders 8; it also includes two oil tanks 1, eight filling valves 3, four low-pressure compensators 4, a filling tank oil replenishing device 5 and a filling tank oil draining device 6; the upper ports of the eight main working plunger cylinders 8 are respectively provided with filling valves 3; the four low-pressure compensators 4 are fixed on the upper platform of the die forging press, and the four low-pressure compensators 4 are connected through hydraulic pipelines; every two filling valves 3 of the eight filling valves 3 are respectively fixedly connected to a low-pressure compensator 4 through hydraulic pipelines; the two filling tanks 2 is placed in a pit beside the die forging press, and is connected to four low-pressure compensators 4 located on the upper part of the die forging press through hydraulic pipelines; the two liquid-filling tanks 2 and the two oil tanks 1 are respectively arranged in parallel, and a liquid-filling tank oil-replenishing device 5 and a liquid-filling tank oil-draining device 6 are arranged between the two liquid-filling tanks 2 and the two oil tanks 1, the input end of the liquid-filling tank oil-replenishing device 5 is communicated with the two parallel oil tanks 1, the output end of the liquid-filling tank oil-replenishing device 5 is communicated with the two parallel liquid-filling tanks 2, the input end of the liquid-filling tank oil-draining device 6 is communicated with the two parallel liquid-filling tanks 2, and the output end of the liquid-filling tank oil-replenishing device 5 is communicated with the two parallel oil tanks 1.

[0026] In actual use, when the moving crossbeam 7 of the die forging press descends rapidly, the eight filling valves 3 are all opened, the four low-pressure compensators 4 are directly connected to the eight main working plunger cylinders 8 of the die forging press, and the oil of the four low-pressure compensators 4 directly and rapidly enters the eight main working plunger cylinders 8. The four low-pressure compensators 4 are connected to the two large filling tanks 2, which can supplement the insufficient oil in the compensators 4 to meet the filling of the eight main working plunger cylinders 8 when the moving crossbeam 7 descends rapidly. The four low-pressure compensators 4 are connected by hydraulic pipelines to ensure the balance of the liquid level and the consistent filling speed of the eight main working plunger cylinders 8.

[0027] When the die forging press is in pressurized operation, the eight filling valves 3 are closed, and the high-pressure oil enters the main working plunger cylinder 8 through the high-pressure pipeline to complete the die forging of the forging.

[0028] When the moving beam 7 rises rapidly, the eight filling valves 3 are also all opened, and the four low-pressure compensators 4 are directly connected to the eight main working plunger cylinders 8 of the die forging press again. The oil in the eight main working plunger cylinders 8 is quickly pressed back into the low-pressure compensator 4 due to the rising of the moving beam. Since the low-pressure compensator 4 is connected to the two large filling tanks 2, the excess oil in the low-pressure compensator 4 will return to the filling tank 2, thereby realizing the rapid rise of the moving beam 7. There are also hydraulic pipelines connected between the four low-pressure compensators 4 to ensure the balance of the liquid level and the consistent discharge speed of the eight main working plunger cylinders.

[0029] During the rapid descent and rapid ascent of the moving crossbeam 7 of the die forging press, there are a liquid filling tank oil replenishing device 5 and a liquid filling tank oil draining device 6 between the two liquid filling tanks 2 and the two oil tanks 1, which can ensure that the two liquid filling tanks 2 are always at a normal liquid level.

[0030] The present invention enables eight main working plunger cylinders 8 of the upgraded 300MN die forging press to be quickly filled and drained when the moving crossbeam 7 moves quickly, thereby effectively improving the operating speed and stability of the 300MN die forging press.

[0031] Embodiment 2:

[0032] Reference Figure 1 The water-to-oil large die forging press multi-main working plunger cylinder rapid liquid filling system shown in the figure is based on the first embodiment, and the volume of the two liquid filling tanks 2 is 35m 3 ~40m 3 .

[0033] In actual use, when the press is unloading, returning, or loading, the liquid level of the filling tank 2 is always at a high level under the combined action of the filling tank oil replenishing device 5 and the filling tank oil draining device 6. When the press idle stroke decreases, the filling tank 2 replenishes oil to the low-pressure compensator 4 in time to prevent it from being sucked empty. The volume of both filling tanks 2 can be 37m 3 The optimal volume value is to meet the need of replenishing oil in the low-pressure compensator 4.

[0034] Embodiment three:

[0035] Reference Figure 1 The water-to-oil large die forging press multi-main working plunger cylinder rapid liquid filling system shown is based on the first embodiment: the hydraulic pipeline is a retractable pipeline.

[0036] In actual use, the hydraulic pipeline adopts a retractable pipeline so that it can better adapt to the elastic deformation of the die forging press during operation.

[0037] Embodiment 4:

[0038] Reference Figure 1 The water-to-oil large-scale die forging press multi-main working plunger cylinder rapid filling system shown is based on the first embodiment: the setting height of the four low-pressure compensators 4 is higher than the height of the eight filling valves 3.

[0039] In actual use, the four low-pressure compensators 4 adopt the technical solution of this invention, that is, the position of the low-pressure compensators 4 is higher than the filling valve 3. When the idle stroke of the compressor decreases, the liquid can be quickly and smoothly replenished to the main working plunger cylinder 8.

[0040] Embodiment five:

[0041] Reference Figure 1The water-to-oil large-scale die forging press multiple main working plunger cylinder rapid liquid filling system shown in the figure, based on the first embodiment: also includes a PLC controller; the PLC controller is connected to the eight main working plunger cylinders 8 with electrical signals respectively.

[0042] In actual use, the setting of the PLC controller enables the eight main working plunger cylinders 8 in the present invention to be automatically opened and closed under the control of the PLC controller, thereby improving the degree of automation.

[0043] Embodiment six:

[0044] Reference Figure 1 The water-to-oil large-scale die forging press multi-main working plunger cylinder rapid filling system shown is based on the first embodiment: the filling tank oil replenishing device 5 includes a screw pump, a filter and a one-way valve; the screw pump oil suction port is connected to the oil tank 1, the screw pump outlet is connected to the filter inlet, the filter outlet is connected to the one-way valve inlet, and the one-way valve outlet is connected to the filling tank 2.

[0045] In actual use, if the liquid level in filling tank 2 is lower than the set liquid level, the screw pump starts, draws oil from oil tank 1 and replenishes it to filling tank 2 through the filter and the one-way valve. The screw pump stops after the liquid level in filling tank 2 reaches the set value.

[0046] Embodiment seven:

[0047] Reference Figure 1 The water-to-oil large-scale die forging press multi-main working plunger cylinder rapid filling system shown is based on Example 1: the filling tank oil discharge device 6 includes an electromagnetic oil drain valve and an overflow valve; the electromagnetic oil drain valve and the overflow valve are connected in parallel, the inlets of the electromagnetic oil drain valve and the overflow valve are connected to the filling tank 2, and the outlets of the electromagnetic oil drain valve and the overflow valve are connected to the oil tank 1.

[0048] In actual use, if the liquid level of the filling tank 2 is higher than the set liquid level, the electromagnetic drain valve is energized to open, and the filling tank 2 discharges oil to the oil tank 1 through the electromagnetic drain valve. In unexpected circumstances, when the liquid level of the filling tank 2 rises and the pressure rises to exceed the set pressure of the relief valve, the relief valve opens, and the filling tank 2 discharges oil to the oil tank 1 through the relief valve, ensuring the safe operation of the filling tank 2.

[0049] Embodiment eight:

[0050] A rapid liquid flushing method for a rapid liquid filling system of a multi-main working plunger cylinder of a large-scale water-to-oil forging press comprises the following steps:

[0051] Step 1: When the moving beam 7 of the die forging press descends rapidly, proceed to step 2; when the die forging press performs pressurization work, proceed to step 3; when the moving beam 7 rises rapidly, proceed to step 4:

[0052] Step 2: The PLC controller controls the eight filling valves 3 to open completely, the four low-pressure compensators 4 and the eight main working plunger cylinders 8 are directly connected, and the oil of the four low-pressure compensators 4 directly and quickly enters the eight main working plunger cylinders 8, completing the rapid descent of the moving beam 7;

[0053] Step 3: The PLC controller controls the eight filling valves 3 to close, and the high-pressure oil enters the eight main working plunger cylinders 8 through the pipeline to complete the die forging of the forging;

[0054] Step 4: The PLC controller controls the eight filling valves 3 to be opened as well, and the four low-pressure compensators 4 and the eight main working plunger cylinders 8 are directly connected again. The oil in the eight main working plunger cylinders 8 is quickly pressed back into the low-pressure compensators 4 due to the moving beam 7, completing the rapid rise of the moving beam 7.

[0055] When the present invention is actually used, when the moving crossbeam 7 of the die forging press descends rapidly, the eight filling valves 3 are all opened under the control of the PLC controller, and the four low-pressure compensators 4 are directly connected to the eight main working plunger cylinders 8 of the die forging press, and the oil of the four low-pressure compensators 4 directly and rapidly enters the eight main working plunger cylinders 8. The four low-pressure compensators 4 are connected to the two filling tanks 2, and the filling tanks 2 can supplement the insufficient oil of the low-pressure compensators 4 to meet the filling of the eight main working plunger cylinders 8 when the moving crossbeam 7 descends rapidly. The four low-pressure compensators 4 are connected by hydraulic pipelines to ensure the balance of the liquid level and the consistent filling speed of the eight main working plunger cylinders 8.

[0056] When the die forging press is in pressurized operation, the eight filling valves 3 are closed, and the high-pressure oil enters the main working plunger cylinder 8 through the high-pressure pipeline to complete the die forging of the forging.

[0057] When the moving crossbeam 7 rises rapidly, the eight filling valves 3 are also all opened, and the four low-pressure compensators 4 are directly connected to the eight main working plunger cylinders 8 of the die forging press again. The oil in the eight main working plunger cylinders 8 is quickly pressed back into the low-pressure compensator 4 due to the rising of the moving crossbeam 7. Since the low-pressure compensator 4 is connected to the two filling tanks 2, the excess oil in the low-pressure compensator 4 will return to the filling tank 2, thereby realizing the rapid rise of the moving crossbeam 7. There are also hydraulic pipelines connected between the four low-pressure compensators 4 to ensure the balance of the liquid level and the consistent discharge speed of the eight main working plunger cylinders 8.

[0058] During the rapid descent and rapid ascent of the moving crossbeam 7 of the die forging press, there are a liquid filling tank oil replenishing device 5 and a liquid filling tank oil draining device 6 between the two large liquid filling tanks 2 and the two oil tanks 1, which can ensure that the two liquid filling tanks 2 are always at a normal liquid level.

[0059] By using the present invention, eight main working oil cylinders of an upgraded 300MN die forging press can be quickly filled and discharged when the moving beam moves quickly, thereby improving the operating speed and stability of the press.

[0060] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A fast liquid filling system for multiple main working plunger cylinders of a large-scale water-to-oil die forging press, comprising at least two liquid filling tanks (2) and eight main working plunger cylinders (8); characterized in that: It also includes two oil tanks (1), eight filling valves (3), four low-pressure compensators (4), a filling tank oil replenishing device (5) and a filling tank oil discharging device (6); the upper ports of the eight main working plunger cylinders (8) are respectively provided with filling valves (3); the four low-pressure compensators (4) are fixed on the upper platform of the die forging press, and the four low-pressure compensators (4) are connected through hydraulic pipelines; every two filling valves (3) of the eight filling valves (3) are respectively fixedly connected to a low-pressure compensator (4) through hydraulic pipelines; the two filling tanks (2) are placed in a pit beside the die forging press, and are respectively connected to the low-pressure compensator (4) through hydraulic pipelines. The four low-pressure compensators (4) located at the upper part of the die forging press are connected; the two liquid filling tanks (2) and the two oil tanks (1) are respectively arranged in parallel, and a liquid filling tank oil replenishing device (5) and a liquid filling tank oil draining device (6) are arranged between the two liquid filling tanks (2) and the two oil tanks (1); the input end of the liquid filling tank oil replenishing device (5) is connected to the two parallel oil tanks (1), the output end of the liquid filling tank oil replenishing device (5) is connected to the two parallel liquid filling tanks (2), the input end of the liquid filling tank oil draining device (6) is connected to the two parallel liquid filling tanks (2), and the output end of the liquid filling tank oil replenishing device (5) is connected to the two parallel oil tanks (1); The four low-pressure compensators (4) are arranged at a height higher than the height of the eight filling valves (3); The liquid filling tank oil discharge device (6) comprises an electromagnetic oil discharge valve and an overflow valve; the electromagnetic oil discharge valve and the overflow valve are connected in parallel, the inlets of the electromagnetic oil discharge valve and the overflow valve are both connected to the liquid filling tank (2), and the outlets of the electromagnetic oil discharge valve and the overflow valve are both connected to the oil tank (1).

2. The water-to-oil large die forging press multi-main working plunger cylinder rapid liquid filling system as claimed in claim 1, characterized in that: The volume of the two liquid filling tanks (2) is 35m 3 ~ 40m 3 .

3. The water-to-oil large die forging press multi-main working plunger cylinder rapid liquid filling system as claimed in claim 1, characterized in that: The hydraulic pipeline is a telescopic pipeline.

4. The water-to-oil large die forging press multi-main working plunger cylinder rapid liquid filling system as claimed in claim 1, characterized in that: It also includes a PLC controller; the PLC controller is respectively connected to the eight main working plunger cylinders (8) with electrical signals.

5. The water-to-oil large die forging press multi-main working plunger cylinder rapid liquid filling system as claimed in claim 1, characterized in that: The liquid filling tank oil replenishing device (5) comprises a screw pump, a filter and a one-way valve; the screw pump oil suction port is connected to the oil tank (1), the screw pump outlet is connected to the filter inlet, the filter outlet is connected to the one-way valve inlet, and the one-way valve outlet is connected to the liquid filling tank (2).

6. The rapid filling method of the rapid filling system of the multi-main working plunger cylinder of the large-scale water-to-oil forging press according to any one of claims 1 to 5, characterized in that: The following steps are included: Step 1: When the movable crossbeam (7) of the die forging press descends rapidly, proceed to step 2; when the die forging press is performing pressurization work, proceed to step 3; when the movable crossbeam (7) ascends rapidly, proceed to step 4: Step 2: The PLC controller controls the eight filling valves (3) to open completely, and the four low-pressure compensators (4) and the eight main working plunger cylinders (8) are directly connected, and the oil of the four low-pressure compensators (4) directly and quickly enters the eight main working plunger cylinders (8), completing the rapid descent of the moving beam (7); Step 3: The PLC controller controls the eight filling valves (3) to close, and the high-pressure oil enters the eight main working plunger cylinders (8) through the pipeline, completing the die forging of the forging; Step 4: The PLC controller controls the eight filling valves (3) to open as well. The four low-pressure compensators (4) and the eight main working plunger cylinders (8) are directly connected again. The oil in the eight main working plunger cylinders (8) is quickly pressed back into the low-pressure compensators (4) due to the moving crossbeam (7), completing the rapid rise of the moving crossbeam (7).

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