Hydraulic driving device for quick opening of valve and hot blast stove

Abstract

The hydraulic driving device comprises a hydraulic oil supply end, an electro-hydraulic reversing valve, a valve oil cylinder and a hydraulic oil outlet end, hydraulic driving is used for replacing conventional electric driving, and the situation that a bypass valve cannot be opened due to power failure of a whole hot air system due to faults can be prevented, so that the valve can be quickly opened. After a hydraulic driving system is adopted, a valve can still be opened through hydraulic driving even in a power-off state, in a hot air system with the high safety requirement, hydraulic driving is used for replacing traditional electric driving, and therefore the hydraulic driving system is high in safety performance and high in safety performance. The method is an effective technical means for improving the emergency capability and the safety guarantee level of the system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic drive, and relates to a valve quick-opening hydraulic drive device and a hot blast stove. BACKGROUND

[0002] In an industrial production process, especially in a high-temperature gas conveying system such as metallurgy and heat energy, a hot blast stove, as one of key equipment, has an important influence on the stability of the whole system in terms of operation efficiency and safety performance. In an existing hot blast stove system, an electric actuator is usually used to control the driving mode of an opening and closing valve. However, the electric driving mode has obvious limitations. Especially in the case of power failure or power system failure, the electric actuator will lose power source, so that the valve cannot be normally opened, and accidents occur.

[0003] In summary, although some existing technical solutions solve the problem that the valve cannot be normally opened due to power failure, there is still a large room for improvement in the opening speed and reliability. SUMMARY

[0004] The application aims at solving the above problems in the prior art, and provides a valve quick-opening hydraulic drive device, which comprises:

[0005] a hydraulic oil supply end;

[0006] an electro-hydraulic reversing valve, which comprises a first reversing working oil port, a second reversing working oil port, a reversing oil inlet and a reversing oil return port, the reversing oil inlet is communicated with the hydraulic oil supply end, and the electro-hydraulic reversing valve comprises an energized state and a de-energized state;

[0007] a valve cylinder, which comprises a valve rod cavity, a valve rodless cavity and a push rod, the first reversing working oil port is communicated with the valve rodless cavity, the second reversing working oil port is communicated with the valve rod cavity, and the push rod is located between the valve rodless cavity and the valve rod cavity;

[0008] a hydraulic oil outlet end, which is communicated with the reversing oil return port;

[0009] when the electro-hydraulic reversing valve is in the energized state, the reversing oil inlet is communicated with the first reversing working oil port, and the second reversing working oil port is communicated with the reversing oil return port;

[0010] when the electro-hydraulic reversing valve is in the de-energized state, the reversing oil inlet is communicated with the second reversing working oil port, and the first reversing working oil port is communicated with the reversing oil return port.

[0011] The hydraulic drive device for quick opening of the valve further comprises a quick opening energy supply assembly, the quick opening energy supply assembly comprises an accumulator, and the reversing oil inlet and the reversing oil outlet are communicated with the accumulator;

[0012] When the electro-hydraulic reversing valve is in the powered state, the hydraulic oil supply end is communicated with the valve rodless cavity and the accumulator respectively;

[0013] When the electro-hydraulic reversing valve is in the unpowered state, the accumulator and the hydraulic oil supply end are communicated with the valve rod cavity.

[0014] The accumulator comprises a first inner cavity, a second inner cavity and a movable push plate, the first inner cavity is separated from the second inner cavity by the movable push plate, the reversing oil inlet and the reversing oil outlet are communicated with the second inner cavity, and the first inner cavity is provided with nitrogen.

[0015] The hydraulic drive device for quick opening of the valve further comprises an energy storage safety valve, which is arranged between the second inner cavity and the hydraulic oil outlet end.

[0016] The energy storage safety valve of the hydraulic drive device for quick opening of the valve further comprises a pressure gauge.

[0017] The hydraulic drive device for quick opening of the valve further comprises a first switch valve, which is arranged between the accumulator and the reversing oil inlet.

[0018] The hydraulic drive device for quick opening of the valve further comprises two superimposed throttle valves, which are arranged between the valve rodless cavity and the first reversing working oil port and between the valve rod cavity and the second reversing working oil port respectively.

[0019] The hydraulic drive device for quick opening of the valve further comprises a check valve, which is arranged between the hydraulic oil supply end and the reversing oil inlet and between the hydraulic oil outlet end and the reversing oil outlet.

[0020] The hydraulic drive device for quick opening of the valve further comprises a second switch valve, which is arranged between the hydraulic oil supply end and the check valve.

[0021] The purpose of the present application is to solve the above-mentioned problems existing in the prior art, and a hot blast furnace is also provided, which comprises a hot blast furnace body and a switch valve, the switch valve is movably connected with the hot blast furnace body, and the switch valve is connected with the push rod.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. Using hydraulic drive instead of conventional electric drive can prevent the entire hot blast system from power failure, causing the bypass valve to be unable to open, and further causing a large amount of high-temperature flue gas in the hot blast furnace to be unable to be quickly discharged, ultimately causing safety hazards such as pressure build-up in the hot blast furnace. After adopting the hydraulic drive system, even in a power failure state, the valve can still be opened through hydraulic drive. In a hot blast system with high safety requirements, using hydraulic drive to replace traditional electric drive is an effective technical means to improve the emergency response capability and safety guarantee level of the system.

[0024] 2. This design not only makes up for the power deficiency caused by the response delay of the main oil circuit, but also significantly improves the opening speed of the valve and the overall dynamic performance of the system. In particular, in a hot blast furnace, emergency opening of the valve can effectively ensure the safety and stability of equipment operation.

[0025] 3. This differential pressure driven hydraulic oil output method enables the accumulator to quickly release the stored energy in the event of insufficient or interrupted energy supply from the main oil circuit, providing the instantaneous thrust required for the valve push rod and ensuring that the valve can be quickly opened. This method not only improves the response speed of the hydraulic system, but also achieves efficient storage and immediate release of energy.

[0026] 4. The hydraulic oil with excessively high pressure in the second inner cavity will quickly flow back to the hydraulic oil outlet end through the accumulator safety valve, thereby effectively reducing the oil pressure in the second inner cavity and avoiding safety hazards such as structural damage to the accumulator, seal failure, or damage to other hydraulic components due to excessively high pressure. The accumulator safety valve also has a dynamic adjustment function and can automatically close and stop pressure relief when the system pressure returns to normal, allowing the accumulator to resume normal energy storage and energy supply state.

[0027] 5. The main function of the first switch valve is to safely and effectively isolate the accumulator from the main hydraulic system when needed. This design not only contributes to the normal operation of the system, but also provides great convenience and safety guarantee for daily maintenance, repair, and air charging operations of the accumulator. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the oil circuit of the hydraulic drive device.

[0029] Figure 2 is Figure 1 an enlarged view of detail A.

[0030] Figure 3 is Figure 1 an enlarged view of detail B.

[0031] Figure 4 is Figure 1Enlarged view of detail C.

[0032] In the figure:

[0033] 1, hydraulic oil supply end; 2, electro-hydraulic reversing valve; 21, first reversing working oil port; 22, second reversing working oil port; 23, reversing oil inlet; 24, reversing oil return port; 3, valve cylinder; 31, valve rod cavity; 32, valve rodless cavity; 33, push rod; 4, hydraulic oil discharge end; 5, quick-opening energy supply assembly; 51, accumulator; 511, first inner cavity; 512, second inner cavity; 513, moving push plate; 52, accumulator safety valve; 521, pressure gauge; 6, first on-off valve; 7, superimposed throttle valve; 8, check valve; 9, second on-off valve. DETAILED DESCRIPTION

[0034] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0035] It should be noted that all directional indications, such as up, down, left, right, front, back, etc., in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0036] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for descriptive purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features, and the meaning of "multiple" in the description of the present application is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0038] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0039] The specific embodiments described herein are merely illustrative of the application and various modifications or supplements to the described embodiments or the use of similar ways instead of the described specific embodiments can be made by those skilled in the art without departing from the patent of the application or exceeding the scope defined by the appended claims.

[0040] As shown in the figure, a valve quick-opening hydraulic drive device comprises a hydraulic oil supply end 1, an electro-hydraulic reversing valve 2, a valve cylinder 3 and a hydraulic oil outlet end 4. Figures 1-4

[0041] The electro-hydraulic reversing valve 2 comprises a first reversing working oil port 21, a second reversing working oil port 22, a reversing inlet oil port 23 and a reversing return oil port 24, the reversing inlet oil port 23 is in communication with the hydraulic oil supply end 1, the electro-hydraulic reversing valve 2 comprises an energized state and a de-energized state.

[0042] The valve cylinder 3 comprises a valve rod cavity 31, a valve rodless cavity 32 and a push rod 33, the first reversing working oil port 21 is in communication with the valve rodless cavity 32, the second reversing working oil port 22 is in communication with the valve rod cavity 31, and the push rod 33 is located between the valve rodless cavity 32 and the valve rod cavity 31.

[0043] The hydraulic oil outlet end 4 is in communication with the reversing return oil port 24.

[0044] When the electro-hydraulic reversing valve 2 is in the energized state, the reversing inlet oil port 23 is in communication with the first reversing working oil port 21, and the second reversing working oil port 22 is in communication with the reversing return oil port 24.

[0045] When the electro-hydraulic reversing valve 2 is in the de-energized state, the reversing inlet oil port 23 is in communication with the second reversing working oil port 22, and the first reversing working oil port 21 is in communication with the reversing return oil port 24.

[0046] ​Specifically, in the normal working state, the electro-hydraulic reversing valve 2 is always in the powered state, at this time, the hydraulic oil flows out from the hydraulic oil outlet end 4, enters the reversing inlet oil port 23, and then flows out from the first reversing working oil port 21, so as to enter the valve rodless cavity 32 of the valve cylinder 3, push the push rod 33 in the valve cylinder 3 to advance, and then close the valve of the hot blast furnace, at this time, the hydraulic oil in the valve rod cavity 31 of the valve cylinder 3 flows out to enter the second reversing working oil port 22, and then flows out from the reversing return oil port 24 to enter the hydraulic oil outlet end 4; when the power failure occurs during the working process, the electro-hydraulic reversing valve 2 becomes a power-off state, the hydraulic oil flows out from the hydraulic oil supply end 1, enters the reversing inlet oil port 23, and then flows out from the second reversing working oil port 22, so as to enter the valve rod cavity 31 of the valve cylinder 3, push the push rod 33 in the valve cylinder 3 to retreat, and then open the valve of the hot blast furnace, release a large amount of high-temperature flue gas in the hot blast furnace, at this time, the hydraulic oil in the valve rodless cavity 32 of the valve cylinder 3 flows out to enter the first reversing working oil port 21, and then flows out from the reversing return oil port 24 to enter the hydraulic oil outlet end 4.

[0047] In the embodiment, hydraulic drive is used instead of conventional electric drive, which can prevent the entire hot blast system from being powered off due to failure, causing the bypass valve to be unable to open, and then causing a large amount of high-temperature flue gas in the hot blast furnace to be unable to be quickly discharged, and finally causing safety hazards such as pressure build-up in the hot blast furnace. After using the hydraulic drive system, even in the power-off state, the valve can still be opened by hydraulic drive. In the hot blast system with high safety requirements, using hydraulic drive instead of traditional electric drive is an effective technical means to improve the emergency capability and safety guarantee level of the system.

[0048] As shown in Figures 1-4 On the basis of the above embodiment, a quick-opening energy supply assembly 5 is further included, the quick-opening energy supply assembly 5 includes an accumulator 51, the reversing inlet oil port 23 and the reversing return oil port 24 are in communication with the accumulator 51;

[0049] When the electro-hydraulic reversing valve 2 is in the powered state, the hydraulic oil supply end 1 is in communication with the valve rodless cavity 32 and the accumulator 51 respectively;

[0050] When the electro-hydraulic reversing valve 2 is in the power-off state, the accumulator 51 and the hydraulic oil supply end 1 are in communication with the valve rod cavity 31.

[0051] Specifically, when the electro-hydraulic directional valve 2 is normally energized, hydraulic oil flows out from the hydraulic oil supply end 1. Part of it flows through the electro-hydraulic directional valve 2 into the valve rodless chamber 32, and part of it enters the accumulator 51. The hydraulic oil entering the valve rodless chamber 32 pushes the push rod 33 to move, thereby closing the valve. When the electro-hydraulic directional valve 2 is de-energized, hydraulic oil flows out from the hydraulic oil supply end 1, flows through the electro-hydraulic directional valve 2 into the valve rod chamber 31, and at the same time, the hydraulic oil that previously entered the accumulator 51 also flows out from the accumulator 51 and enters the valve rod chamber 31 through the hydraulic oil supply end 1, pushing the push rod 33 to move, thereby quickly opening the valve.

[0052] In this embodiment, this design not only compensates for the power deficiency caused by the response delay of the main oil circuit, but also significantly improves the valve opening speed and the overall dynamic performance of the system. In particular, in the hot blast furnace, the emergency valve opening can effectively ensure the safety and stability of the equipment operation.

[0053] like Figures 1-4 As shown, based on the above embodiment, the accumulator 51 includes a first inner cavity 511, a second inner cavity 512, and a movable push plate 513. The first inner cavity 511 and the second inner cavity 512 are separated by the movable push plate 513. The reversing oil inlet 23 and the reversing oil return port 24 are both connected to the second inner cavity 512. The first inner cavity 511 is provided with nitrogen.

[0054] Specifically, the first inner cavity 511 of the accumulator 51 is provided with a certain amount of nitrogen gas. After the hydraulic oil enters the accumulator 51, it enters the second inner cavity 512. The hydraulic oil in the second inner cavity 512 pushes the moving push plate 513 to move towards the first inner cavity 511 until the pressure of the first inner cavity 511 and the second inner cavity 512 are the same. When the second inner cavity 512 is no longer being pushed into the hydraulic oil, the pressure in the first inner cavity 511 will be greater than the pressure in the second inner cavity 512, thereby pushing the hydraulic oil in the second inner cavity 512 to flow towards the valve rod chamber 31.

[0055] In this embodiment, the hydraulic oil output method driven by differential pressure enables the accumulator 51 to quickly release the stored energy when the main oil circuit power supply is insufficient or interrupted, providing the instantaneous thrust required for the valve push rod 33, ensuring that the valve can be opened quickly. This method not only improves the response speed of the hydraulic system, but also achieves efficient energy storage and instant release.

[0056] like Figures 1-4 As shown, based on the above embodiment, it also includes an energy storage safety valve 52, which is disposed between the second inner cavity 512 and the hydraulic oil outlet 4.

[0057] Specifically, the energy storage safety valve 52 is located between the energy storage device 51 and the hydraulic oil outlet 4. After a portion of the hydraulic oil from the hydraulic oil outlet 4 enters the second inner cavity 512, the second inner cavity 512 is simultaneously connected to the hydraulic oil outlet 4 through the energy storage safety valve 52. When the hydraulic oil pressure in the second inner cavity 512 is greater than the set value of the energy storage safety valve 52, the hydraulic oil in the second inner cavity 512 will flow out from the hydraulic oil outlet 4 through the energy storage safety valve 52.

[0058] In this embodiment, the hydraulic oil with excessive pressure in the second inner cavity 512 will quickly flow back to the hydraulic oil outlet 4 through the energy storage safety valve 52, thereby effectively reducing the oil pressure in the second inner cavity 512 and avoiding safety hazards such as damage to the accumulator 51 structure, seal failure, or damage to other hydraulic components caused by excessive pressure. The energy storage safety valve 52 also has a dynamic adjustment function. After the system pressure returns to normal, it can automatically close and stop depressurization, so that the accumulator 51 can return to the normal energy storage and power supply state.

[0059] like Figures 1-4 As shown, based on the above embodiment, the energy storage safety valve 52 is also equipped with a pressure gauge 521.

[0060] In this embodiment, the energy storage safety valve 52 not only plays an important role in pressure relief protection, but the pressure gauge 521 equipped on it also further enhances the system's monitorability and operational controllability, enabling real-time monitoring and accurate reading of the hydraulic oil pressure inside the second inner cavity 512 of the energy storage 51.

[0061] like Figures 1-4 As shown, based on the above embodiment, a first switching valve 6 is also included, which is disposed between the accumulator 51 and the reversing oil inlet 23.

[0062] In this embodiment, the main function of the first switching valve 6 is to safely and effectively isolate the accumulator 51 from the main hydraulic system when needed. This design not only helps the normal operation of the system, but also provides great convenience and safety for the daily maintenance, repair and air replenishment of the accumulator 51.

[0063] like Figures 1-4 As shown, based on the above embodiment, it also includes a superimposed throttle valve 7. The number of superimposed throttle valves 7 is two. The two superimposed throttle valves 7 are respectively disposed between the valve rodless chamber 32 and the first reversing working port 21 and between the valve rod chamber 31 and the second reversing working port 22.

[0064] Specifically, the two superimposed throttle valves 7 are connected in series in the corresponding hydraulic oil circuits. By adjusting their opening size, the flow rate of hydraulic oil flowing into or out of the rodless chamber 32 and the rod chamber 31 of the valve can be effectively controlled.

[0065] In this embodiment, by independently adjusting the two superimposed throttle valves 7, the opening and closing speeds of the valves can be controlled separately, meeting the requirements for smooth operation, response speed, and impact control under different working conditions.

[0066] like Figures 1-4 As shown, based on the above embodiment, a one-way valve 8 is also included. The one-way valve 8 is disposed between the hydraulic oil supply end 1 and the reversing oil inlet 23. The one-way valve 8 is also disposed between the hydraulic oil outlet end and the reversing oil return port 24.

[0067] Specifically, the check valve 8 not only prevents the hydraulic oil in the pipeline from flowing back, but also, when the check valve 8 is located between the hydraulic oil supply end 1 and the solenoid reversing inlet 23, it allows the hydraulic oil supplied by the accumulator 51 to flow to the valve rod chamber 31 instead of the hydraulic oil supply end 1 in the event of power failure.

[0068] In this embodiment, the one-way valve 8 effectively blocks the path of hydraulic oil back to the hydraulic oil supply end 1, forcing the hydraulic oil output by the accumulator 51 to flow only in the set direction, that is, into the rod chamber of the valve, thereby pushing the valve to open quickly.

[0069] like Figures 1-4 As shown, based on the above embodiment, a second switching valve 9 is also included, which is disposed between the hydraulic oil supply end 1 and the check valve 8.

[0070] Specifically, the second switching valve 9 is located between the hydraulic oil supply end 1 and the check valve 8, and plays the role of opening or cutting off the entire hydraulic power circuit. It can quickly cut off the supply of hydraulic oil to the hydraulic oil supply end 1 when the equipment is under maintenance or malfunctions, so as to ensure the safety of the staff.

[0071] Secondly, a hot air furnace is proposed, including: the hot air furnace body (not shown in the figure) and the switch valve (not shown in the figure).

[0072] The switch valve is movably connected to the hot air furnace body and is connected to the push rod 33.

[0073] Specifically, the hydraulic drive device for quick-opening the valve is located next to the hot blast stove body, and its push rod 33 is connected to the switch valve of the hot blast furnace. When the entire system is in a power outage state, the hydraulic drive device for quick-opening the valve can push the switch valve to open, preventing the hot blast stove body from having a safety accident due to the switch valve not being able to open quickly.

Claims

1. A hydraulic drive for quick opening of a valve, characterized in that The hydraulic oil supply end; The electro-hydraulic reversing valve includes a first reversing working oil port, a second reversing working oil port, a reversing oil inlet port, and a reversing oil return port, the reversing oil inlet port is in communication with the hydraulic oil supply end, the electro-hydraulic reversing valve includes an energized state and a de-energized state; The valve oil cylinder includes a valve rod cavity, a valve rodless cavity, and a push rod, the first reversing working oil port is in communication with the valve rodless cavity, the second reversing working oil port is in communication with the valve rod cavity, and the push rod is located between the valve rodless cavity and the valve rod cavity; The hydraulic oil outlet end is in communication with the reversing oil return port; When the electro-hydraulic reversing valve is in the energized state, the reversing oil inlet port is in communication with the first reversing working oil port, and the second reversing working oil port is in communication with the reversing oil return port; When the electro-hydraulic reversing valve is in the de-energized state, the reversing oil inlet port is in communication with the second reversing working oil port, and the first reversing working oil port is in communication with the reversing oil return port. The quick-opening energy supply assembly includes an accumulator, the reversing oil inlet port and the reversing oil return port are in communication with the accumulator; 2. A hydraulic drive for quick opening of a valve as claimed in claim 1, characterized in that: When the electro-hydraulic reversing valve is in the energized state, the hydraulic oil supply end is in communication with the valve rodless cavity and the accumulator, respectively; When the electro-hydraulic reversing valve is in the de-energized state, the accumulator and the hydraulic oil supply end are in communication with the valve rod cavity. The accumulator includes a first inner cavity, a second inner cavity, and a movable push plate, the first inner cavity is separated from the second inner cavity by the movable push plate, the reversing oil inlet port and the reversing oil return port are in communication with the second inner cavity, and the first inner cavity is provided with nitrogen.

3. A hydraulic drive for quick opening of a valve as claimed in claim 2, characterized in that: The accumulator safety valve is arranged between the second inner cavity and the hydraulic oil outlet end.

4. A hydraulic drive for quick opening of a valve as claimed in claim 3, characterized in that: The accumulator safety valve is also provided with a pressure gauge.

5. A hydraulic drive for quick opening of a valve as claimed in claim 4, characterized in that: The first switch valve is arranged between the accumulator and the reversing oil inlet port.

6. A hydraulic drive for quick opening of a valve as claimed in claim 5, characterized in that: The two superimposed throttle valves are arranged between the valve rodless cavity and the first reversing working oil port, and between the valve rod cavity and the second reversing working oil port, respectively.

7. A hydraulic drive for quick opening of a valve as defined in claim 1, wherein: The check valve is arranged between the hydraulic oil supply end and the reversing oil inlet port, and also arranged between the hydraulic oil outlet end and the reversing oil return port.

8. A hydraulic drive for quick opening of a valve as defined in claim 1, characterized in that: The second switch valve is arranged between the hydraulic oil supply end and the check valve.

9. A hydraulic drive for quick opening of a valve as claimed in claim 8, characterized in that: The hydraulic drive device for quick opening of a valve includes a hot blast stove body and a switch valve, the switch valve is movably connected with the hot blast stove body, and the switch valve is connected with the push rod.

10. A hot blast stove characterized by ​

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