Unloading valve platform safety protection device and hydraulic station energy accumulator group

Abstract

This utility model relates to the field of automatic unloading technology for hydraulic accumulators in hydraulic power stations, specifically to a safety protection device for an unloading valve platform and a hydraulic power station accumulator assembly, including an electromagnetic reversing valve and an unloading oil tank. The electromagnetic reversing valve has a P port, an A port, a B port, and a T port, and has a first working position and a second working position. In the first working position, the P port is connected to the A port, and the B port is connected to the T port, forming a normal oil inlet path. After the electromagnetic reversing valve is energized, it switches to the second working position, at which point the P port is connected to the B port, and the A port is connected to the T port. The hydraulic oil in the accumulator can be quickly unloaded to the oil tank through the T port, thereby achieving safe depressurization of the system. This device has a simple structure, responds quickly, and can effectively reduce environmental pollution and fire risks caused by hydraulic oil leakage.

Description

Technical Field

[0001] This utility model relates to the field of automatic unloading technology for hydraulic accumulators in hydraulic power stations, specifically to a safety protection device for an unloading valve platform and a hydraulic power station accumulator group. Background Technology

[0002] In the hydraulic systems of bar mills, accumulators are commonly used to store high-pressure hydraulic oil to provide energy compensation for operations such as roll changing on the rolling mill, packing on the cooling bed, and loading steel into the heating furnace. However, many hydraulic station systems are based on older designs and lack rapid unloading response devices. When emergencies such as hydraulic oil leaks or fires occur on-site, although the oil supply to the hydraulic pump can be cut off in time via the emergency stop button, the high-pressure hydraulic oil stored in the accumulator cannot be discharged in time because the system is not equipped with a dedicated accumulator unloading channel, and leakage will continue.

[0003] Such leaks can lead to hydraulic oil flowing into the water system and causing pollution. Furthermore, if hydraulic oil splashes onto hot steel surfaces, it can easily cause a fire due to its low flash point (approximately 198°C), posing a serious safety hazard. Utility Model Content

[0004] The technical objective of this invention is to design a safety protection device for an unloading valve platform and a hydraulic station accumulator group, addressing the problems existing in the aforementioned background technology.

[0005] To achieve the above-mentioned technical objectives, this utility model provides the following technical solution:

[0006] In a first aspect, a safety protection device for an unloading valve platform includes: an electromagnetic directional valve, including at least a first working position for forming an oil drain path and a second working position for unloading;

[0007] The unloading oil tank is connected to the T port of the solenoid directional valve via an oil circuit;

[0008] The inlet of the cartridge-type relief valve is installed on the accumulator group's oil inlet pipe, and the outlet of the cartridge-type relief valve is connected to port A; the cartridge-type relief valve has an adjustable set pressure threshold structure and is used to monitor the pressure in the accumulator group's oil inlet pipe.

[0009] After the electromagnetic reversing valve is energized, it is adjusted from the first working position to the second working position. When the system pressure exceeds the set threshold, the inlet of the cartridge relief valve is opened. At this time, the P port and B port of the electromagnetic reversing valve are connected, and the T port and A port are connected. Then, the hydraulic oil flows through the outlet of the cartridge relief valve to the A port and then unloads the hydraulic oil into the unloading oil tank through the T port.

[0010] When the electromagnetic directional valve is not energized, it is in the first working position; the inlet of the cartridge relief valve is closed, port P is connected to port A, and port B is connected to port T.

[0011] Furthermore, when the electromagnetic reversing valve is in the first working position, the hydraulic oil in the accumulator group inlet pipe is unloaded to the direct return oil tank through the manual ball valve.

[0012] Furthermore, the electromagnetic directional valve is a two-position four-way directional valve.

[0013] Furthermore, a cover plate; the cover plate is installed between the solenoid directional valve and the cartridge relief valve, and the cover plate has an oil passage inside for connecting the P port of the solenoid directional valve to the inlet of the cartridge relief valve, and connecting the outlet of the cartridge relief valve to the A port of the solenoid directional valve through the oil passage of the cover plate.

[0014] In a second aspect, a hydraulic station accumulator assembly includes the unloading valve platform safety protection device described in the first aspect; it also includes an accumulator; the accumulator is connected to port A of the solenoid directional valve via an oil circuit.

[0015] Furthermore, it also includes an emergency stop button; the safety protection device of the unloading valve platform is interlocked with the emergency stop button.

[0016] Furthermore, each of the accumulators is equipped with an unloading valve platform safety protection device.

[0017] Furthermore, the energy storage device comprises at least seven units.

[0018] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0019] This application achieves automatic unloading when the system pressure exceeds a set threshold by adjusting the structure and operating state of the electromagnetic directional valve. When the system pressure rises to the set threshold, the electromagnetic directional valve is energized and switches to the second operating position. At this time, ports P and B are connected, and ports T and A are connected. Hydraulic oil is discharged from port T into the unloading tank, forming a rapid unloading channel. This effectively solves the problem that existing hydraulic systems cannot unload the accumulator pressure in an emergency stop state, significantly reducing the risk of leakage caused by high-pressure residual fluid. It also effectively prevents hydraulic oil from splashing onto the surface of high-temperature steel and causing combustion, reducing the risk of fire. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] The above and other aspects of the present invention will now be described by way of example only, with reference to the accompanying drawings, in which:

[0022] Figure 1 This utility model provides a schematic diagram of the hydraulic oil circuit for a safety protection device for an unloading valve platform and a hydraulic station accumulator group.

[0023] In the diagram: 1. Accumulator; 2. Cartridge-type relief valve; 3. Cover plate; 4. Solenoid directional valve; 5. Unloading oil tank; 6. Manual ball valve; 7. Direct return oil tank. Detailed Implementation

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1:

[0026] like Figure 1 As shown, this embodiment provides a safety protection device for an unloading valve platform, used to achieve system unloading in a hydraulic system, including:

[0027] Solenoid directional valve 4: A two-position four-way solenoid directional valve 4 is selected, which has four oil ports: P, A, B and T.

[0028] The electromagnetic directional valve 4 has two working positions: the first working position (not energized): port P is connected to port A, and port B is connected to port T; the second working position (energized): port P is connected to port B, and port A is connected to port T. The electromagnetic directional valve 4 switches its working state by controlling the electrical signal to establish the oil supply path and the unloading path.

[0029] Unloading oil tank 5: The T-port is connected to the unloading oil tank 5. When the system is unloaded, the hydraulic oil flows into the tank through the T-port to prevent leakage.

[0030] When the emergency stop button is pressed, the control circuit supplies power to the solenoid directional valve 4, causing the solenoid directional valve 4 to switch from the first working position to the second working position. At this time, when the system pressure reaches or exceeds the preset response threshold, an unloading path is established to realize the return of oil from the accumulator 1.

[0031] Under normal operating conditions, the solenoid directional valve 4 is not energized and is in the first working position. The cartridge relief valve 2 is not open, and the hydraulic oil in the accumulator 1 is unloaded through the manual ball valve 6 to the direct return oil tank 7. When the solenoid directional valve 4 is energized, once the system pressure is detected to exceed the safety threshold, the high-pressure oil in the system has exceeded the safety threshold of the cartridge relief valve 2. The high-pressure oil flows from the cartridge relief valve 2 into port A, which is connected to port T. The hydraulic oil is discharged to the unloading oil tank 5 through this passage to achieve rapid pressure relief. Example 2:

[0032] Based on Embodiment 1, this embodiment provides a hydraulic station accumulator group, including:

[0033] Safety protection device for unloading valve platform: The structure is the same as in Example 1, consisting of electromagnetic reversing valve 4 and unloading oil tank 5, used to realize pressure response unloading function;

[0034] Cartridge-mounted relief valve 2: Installed on the oil line at the inlet of the accumulator group shown in the diagram, such as... Figure 1 The arrow in the image points to the direction of the accumulator group's oil inlet, which is used to monitor system pressure. It has an adjustable pressure threshold and provides a signal for the solenoid directional valve 4 to switch when overpressure occurs.

[0035] Cover plate 3: Installed between the solenoid directional valve 4 and the cartridge relief valve 2, with an internal oil passage for connecting the P port of the solenoid directional valve 4 to the inlet of the cartridge relief valve 2; and connecting the outlet of the cartridge relief valve 2 to the A port; the cover plate 3 realizes oil circuit integration, simplifies external pipeline connection, and improves structural compactness and system reliability.

[0036] Accumulator 1: The system pressure is monitored by cartridge relief valve 2. Accumulator 1 is used to store high-pressure hydraulic oil in the system for compensation and emergency response during system operation.

[0037] Emergency Stop Button: The control circuit is equipped with an emergency stop button, which is interlocked with the solenoid directional valve 4. When the emergency stop button is pressed in an emergency, the solenoid directional valve 4 is immediately energized and switched to the second operating position to complete the system unloading.

[0038] This embodiment applies to systems with multiple accumulators 1. Each accumulator 1 can be configured with an independent unloading valve platform safety protection device, or multiple accumulators 1 can share a single device. The specific configuration can be flexibly set according to the actual working conditions. Taking a bar mill as an example, seven sets of accumulators 1 can be set up, and each accumulator 1 can be configured with a corresponding unloading valve platform structure.

[0039] Under normal operating conditions, the P port to the A port is connected, and the accumulator 1 can replenish the pressure normally. When the pressure exceeds the set value, or the emergency stop button is pressed, the electromagnetic reversing valve 4 is energized due to the interlock between the electromagnetic reversing valve 4 and the emergency stop button, and the reversing passage is established. The system quickly unloads through the path of A port → T port → oil tank.

[0040] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

[0041] Although the present disclosure has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to the embodiments of the present disclosure, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present disclosure are within the scope of protection claimed by the present disclosure.

Claims

1. A safety protection device for an unloading valve platform, characterized in that, include: The electromagnetic directional valve (4) includes at least a first working position for forming an oil drain path and a second working position for unloading; The unloading oil tank (5) is connected to the T port of the electromagnetic reversing valve (4) through an oil circuit; A cartridge-type relief valve (2) is installed on the accumulator group oil inlet pipe, and its outlet is connected to port A. The cartridge-type relief valve (2) is an adjustable pressure threshold structure used to monitor the pressure in the accumulator group oil inlet pipe. After the electromagnetic reversing valve (4) is energized, it is adjusted from the first working position to the second working position. When the system pressure exceeds the set threshold, the inlet of the cartridge relief valve (2) is opened. At this time, the P port of the electromagnetic reversing valve (4) is connected to the B port, and the T port is connected to the A port. Then the hydraulic oil flows through the outlet of the cartridge relief valve (2) to the A port and then unloads the hydraulic oil into the unloading oil tank (5) through the T port. When the electromagnetic reversing valve (4) is not energized, the electromagnetic reversing valve (4) is in the first working position; the inlet of the cartridge relief valve (2) is closed, the P port is connected to the A port, and the B port is connected to the T port.

2. The safety protection device for the unloading valve platform according to claim 1, characterized in that, When the electromagnetic reversing valve (4) is in the first working position, the hydraulic oil in the accumulator group inlet pipe is unloaded to the direct return oil tank (7) through the manual ball valve (6).

3. The safety protection device for the unloading valve platform according to claim 1, characterized in that, The electromagnetic reversing valve (4) is a two-position four-way reversing valve.

4. The safety protection device for the unloading valve platform according to claim 1, characterized in that, Also includes: Cover plate (3); The cover plate (3) is installed between the electromagnetic directional valve (4) and the cartridge relief valve (2). The cover plate (3) has an oil passage inside, which is used to connect the P port of the electromagnetic directional valve (4) with the inlet of the cartridge relief valve (2), and to connect the outlet of the cartridge relief valve (2) to the A port of the electromagnetic directional valve (4) through the oil passage of the cover plate (3).

5. A hydraulic station accumulator group, characterized in that, It includes the unloading valve platform safety protection device as described in any one of claims 1-4; it also includes: an accumulator (1); the accumulator (1) is connected to port A of the electromagnetic directional valve (4) via an oil circuit.

6. The hydraulic station accumulator group according to claim 5, characterized in that, It also includes an emergency stop button; the safety protection device of the unloading valve platform is interlocked with the emergency stop button.

7. The hydraulic station accumulator group according to claim 5, characterized in that, Each of the accumulators (1) is equipped with a safety protection device for the unloading valve platform.

8. The hydraulic station accumulator group according to claim 7, characterized in that, The energy storage device (1) comprises at least 7 units.

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