Liquid supply loop for quick start of return stroke of hydraulic forging machine

Abstract

The utility model provides a liquid supply loop for quick start of a return stroke of a hydraulic forging machine, a return stroke oil path is divided into a return stroke starting oil path and a return stroke accelerating oil path, the return stroke starting oil path comprises an oil pipeline, a two-position two-way electromagnetic switch valve, a one-way valve and a return stroke energy accumulator, and when a movable beam is started, the return stroke starting oil path is connected with the return stroke accelerating oil path; the return stroke energy accumulator independently provides hydraulic oil to push the movable beam to start the return stroke instantly. The return stroke acceleration oil way comprises an oil pipeline, a three-position four-way electromagnetic reversing valve and a hydraulic pump, and after the movable beam is started, the hydraulic pump in the return stroke acceleration oil way is switched to independently provide hydraulic oil to push the movable beam to accelerate return stroke. The liquid supply device has the advantages of unique liquid supply mode, high return response speed, energy conservation, high efficiency and the like.

Description

Technical Field

[0001] This utility model relates to a hydraulic oil supply circuit, specifically to an oil circuit design for supplying hydraulic oil to a hydraulic forging machine for rapid response and accelerated return, belonging to the field of hydraulic transmission technology. Background Technology

[0002] Traditional hydraulic forging machines use hydraulic oil to drive a return cylinder, which in turn moves a movable beam upwards for the return stroke. A hydraulic pump directly supplies oil to the return cylinder. However, due to the significant weight of the movable beam, the hydraulic pump requires a pressure build-up process, resulting in a slow response speed and impacting forging speed and quality. To address this issue, a system combining accumulators and hydraulic pumps to supply oil to the return cylinder has been implemented. However, ensuring sufficient pressure and oil volume during the return stroke requires numerous accumulators, significantly increasing manufacturing costs. Therefore, a new hydraulic circuit for the return stroke of the hydraulic cylinder needs to be designed to overcome these drawbacks. Utility Model Content

[0003] In response to the problems pointed out in the background art, this utility model proposes a hydraulic supply circuit for rapid start-up of the return stroke of a hydraulic forging machine. It sets up a circuit with a dedicated return accumulator and an automatic switching of hydraulic pump oil supply, so that the movable beam can start and rise instantly and return quickly.

[0004] To achieve the above objectives, this utility model provides a hydraulic supply circuit for rapid return start of a hydraulic forging machine, including a hydraulic pump. The hydraulic forging machine comprises a main cylinder, a return cylinder, and a movable beam. The pipeline connecting the hydraulic pump to the main cylinder is a pressurized oil circuit, and the pipeline connecting the hydraulic pump to the return cylinder is a return oil circuit. The invention is characterized by:

[0005] The return oil circuit is configured as a return start oil circuit and a return acceleration oil circuit; the return start oil circuit includes: oil pipeline, hydraulic valve, and return accumulator. The hydraulic valve includes a two-position two-way solenoid valve and a check valve, which are installed on the oil pipeline connecting the return accumulator and the return cylinder. When the movable beam initially returns, the return start oil circuit and the return accumulator separately supply hydraulic oil to push the movable beam to start the return instantly.

[0006] The one-way valve in the return start oil circuit controls the return accumulator to supply hydraulic oil to the return cylinder, and the two-position two-way solenoid switch valve opens when the movable beam starts to return and closes under other working conditions.

[0007] The return acceleration oil circuit includes: oil pipeline, hydraulic valve, and hydraulic pump. The hydraulic valve includes a three-position four-way solenoid directional valve. The hydraulic pump is connected to the three-position four-way solenoid directional valve and the return cylinder in sequence through the oil pipeline. After the movable beam is started, the hydraulic pump in the return acceleration oil circuit provides hydraulic oil separately for the movable beam to accelerate its return, thereby pushing the movable beam to accelerate its return.

[0008] Preferably, when the master cylinder is pressed down, the three-position four-way solenoid directional valve opens and simultaneously closes the two-position two-way solenoid switch valve.

[0009] Preferably, the return accumulator is connected to the rodless chamber of the main cylinder, and a one-way valve is installed on the oil pipeline connected to it to control the main cylinder to replenish oil and pressurize the return accumulator.

[0010] This utility model is equipped with a return start oil circuit with independent oil supply from the return accumulator and a return acceleration oil circuit with independent oil supply from the hydraulic pump. The high-pressure hydraulic oil stored in the return accumulator in the return start oil circuit enables the movable beam to start and rise rapidly. After the hydraulic pump in the return acceleration oil circuit builds up pressure, it automatically switches to hydraulic pump to continue supplying hydraulic oil to the return cylinder, so as to realize the rapid response of the movable beam and accelerate the return.

[0011] This invention has the advantages of unique liquid supply method, fast return response speed and energy saving and high efficiency. Attached Figure Description

[0012] Appendix Figure 1 This is a schematic diagram of the hydraulic structure of this utility model.

[0013] In the attached diagram, 1 is a hydraulic forging machine, 2 is a hydraulic pump, 3 is a three-position four-way solenoid directional valve, 4 is a first check valve, 5 is a second check valve, 6 is a two-position two-way solenoid switch valve, 7 is a return accumulator, a is the main cylinder, and b is the return cylinder. Detailed Implementation

[0014] The attached diagram illustrates an embodiment where a return accumulator is used to supply pressurized oil for the start-up of the movable beam. Figure 1 The hydraulic pump 2 is controlled by a three-position four-way solenoid valve 3, providing pressurized oil for both the return stroke and forging stroke of the hydraulic forging machine 1. When the left side of the three-position four-way solenoid valve 3 is energized, the hydraulic pump 2 supplies hydraulic oil to the return cylinder b. At the start of the return stroke, the return accumulator 7 independently supplies hydraulic oil to the return cylinder b. The high-pressure hydraulic oil in the return accumulator 7 is instantly supplied to the return cylinder b, causing the movable beam to start instantly. As the hydraulic oil in the return accumulator 7 is released, the pressure in the return accumulator 7 decreases, while the hydraulic pump 2 builds up pressure. When the pressure in the return acceleration circuit composed of the hydraulic pump 2, the three-position four-way solenoid valve 3, and the return cylinder b is greater than or equal to the pressure in the return start circuit composed of the return accumulator 7, the two-position two-way solenoid valve 6, and the second check valve 5, the second check valve 5 closes, and the hydraulic pump 2 independently supplies hydraulic oil to the return cylinder b. This achieves the instantaneous start-up and rapid return of the movable beam.

[0015] When the right side of the three-position four-way solenoid directional valve 3 is energized, the hydraulic pump 2 supplies hydraulic oil to the main cylinder a. The return accumulator 7 is connected to the rodless chamber of the main cylinder a, and a first check valve 4 is installed on the oil pipeline connected to it. As the hydraulic pump 2 continuously supplies hydraulic oil to the main cylinder a, the pressure of the hydraulic oil in the main cylinder a continuously increases. When the oil pressure in the main cylinder a is equal to or greater than the pressure in the return accumulator 7, the first check valve 4 opens, and the high-pressure oil in the main cylinder a replenishes and pressurizes the return accumulator 7.

[0016] As attached Figure 1 As shown, in the preferred embodiment, the two-position two-way solenoid valve 6 can be closed at the same time as the right side of the three-position four-way solenoid valve 3 is energized, or it can be closed simultaneously with the second check valve 5 during the return stroke.

[0017] Hydraulic forging machine return stroke:

[0018] When the return oil circuit is opened, the return accumulator 7 and hydraulic pump 2 supply hydraulic oil to the return cylinder b. The high-pressure hydraulic oil in the return accumulator 7 first causes the movable beam to start and rise. After the movable beam starts, the oil pressure in the return accumulator 7 decreases, and the pressure in the oil pipeline of hydraulic pump 2 quickly builds up, causing the second check valve 5 at the oil outlet of the return accumulator 7 to close, switching the hydraulic pump 2 to supply hydraulic oil to the return hydraulic cylinder b.

[0019] Hydraulic forging machine pressing down:

[0020] Hydraulic pump 2 supplies hydraulic oil to master cylinder a, and the oil pressure in master cylinder a gradually increases. When the pressure of hydraulic oil in the rodless chamber of master cylinder a is greater than or equal to the hydraulic oil pressure output by return accumulator 7, the first check valve 4 in the return acceleration oil circuit opens to replenish oil and increase pressure for return accumulator 7. Under other operating conditions, the first check valve 4 is closed.

Claims

1. A hydraulic supply circuit for rapid return start of a hydraulic forging machine, comprising a hydraulic forging machine and a hydraulic pump, wherein the hydraulic forging machine includes: a main cylinder, a return cylinder, and a movable beam; the pipeline connecting the hydraulic pump to the main cylinder is a pressurized oil circuit, and the pipeline connecting the hydraulic pump to the return cylinder is a return oil circuit, characterized in that: The return oil circuit is configured as a return start oil circuit and a return acceleration oil circuit; the return start oil circuit includes: oil pipeline, hydraulic valve, and return accumulator. The hydraulic valve includes a two-position two-way solenoid valve and a check valve, which are installed on the oil pipeline connecting the return accumulator and the return cylinder. When the movable beam initially returns, the return start oil circuit and the return accumulator separately supply hydraulic oil to push the movable beam to start the return instantly. The one-way valve in the return start oil circuit controls the return accumulator to supply hydraulic oil to the return cylinder, and the two-position two-way solenoid switch valve opens when the movable beam starts to return and closes under other working conditions. The return acceleration oil circuit includes: oil pipeline, hydraulic valve, and hydraulic pump. The hydraulic valve includes a three-position four-way solenoid directional valve. The hydraulic pump is connected to the three-position four-way solenoid directional valve and the return cylinder in sequence through the oil pipeline. After the movable beam is started, the hydraulic pump in the return acceleration oil circuit provides hydraulic oil separately for the movable beam to accelerate its return, thereby pushing the movable beam to accelerate its return.

2. The hydraulic supply circuit for rapid return start of a hydraulic forging machine according to claim 1, characterized in that: When the master cylinder is pressed down, the three-position four-way solenoid directional valve opens and simultaneously closes the two-position two-way solenoid switch valve.

3. The hydraulic forging machine return quick start fluid supply circuit of claim 1 wherein: The return accumulator is connected to the rodless chamber of the main cylinder, and a one-way valve is installed on the oil pipeline connected to it to control the main cylinder to replenish oil and increase pressure to the return accumulator.

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