A double shaft driven bellow valve and control method

Abstract

This invention provides a dual-axis driven bellows valve and its control method. The bellows valve includes a drive mechanism, a linkage mechanism, a valve body, a first valve plate, and a second valve plate. Both the first and second valve plates are rotatably disposed inside the valve body and are symmetrically arranged. The drive mechanism is located outside the valve body. The linkage mechanism is connected to the output end of the drive mechanism and simultaneously connects the first and second valve plates to drive them to perform synchronous movements in opposite directions. When the first and second valve plates are engaged, they completely block the flow channel inside the valve body. This invention employs a dual-axis symmetrical drive, split valve plate structure. Each valve plate is driven by its own rotating shaft, and each shaft bears the load of only one valve plate. This avoids the situation in a single-axis structure where all loads are concentrated on a single shaft, thereby significantly reducing the wear rate of each shaft and bushing.

Description

Technical Field

[0001] This invention relates to the field of metallurgical sintering equipment technology, specifically to a dual-axis driven bellows valve and control method for regulating the negative pressure of a sintering machine bellows, which is particularly suitable for scenarios involving precise regulation and intelligent control of flue gas flow and negative pressure in sintering machine bellows. Background Technology

[0002] The sintering machine bellows valve is a core control component of the sintering negative pressure system, used to regulate the flue gas flow and stabilize the furnace negative pressure, directly affecting the combustion quality of sintered ore, fan energy consumption, and equipment operational stability. Traditional sintering machine bellows valves mostly adopt a single-shaft drive, single-panel flip structure, and are equipped with complex linkage transmission mechanisms. Under long-term high temperature, high dust, and erosion wear conditions, many technical defects have been exposed: First, the single shaft experiences concentrated force, resulting in severe wear of the bushing and rotating shaft, leading to valve jamming and high failure rates of air leakage; second, the linkage mechanism is complex, occupies a large installation space, restricts plant layout, and the connecting rod pins are prone to wear, making maintenance and replacement difficult; third, the valve sealing surface and inner cavity lack wear-resistant protection, resulting in rapid erosion wear and short service life; fourth, traditional valves rely on manual adjustment and cannot be linked with the bellows negative pressure in real time, resulting in large negative pressure fluctuations and poor stability of sintering conditions.

[0003] In summary, there is an urgent need for a dual-axis driven bellows valve and control method to solve the problems existing in the prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-axis driven bellows valve, aiming to solve the problems of severe single-axis wear, complex linkage mechanism, large installation footprint, poor wear resistance, and unintelligent negative pressure regulation in the existing technology. The specific technical solution is as follows: A dual-axis driven bellows valve includes a drive mechanism, a linkage mechanism, a valve body, a first valve plate, and a second valve plate. The first valve plate and the second valve plate are rotatably disposed inside the valve body and are symmetrically arranged. The drive mechanism is disposed outside the valve body. The linkage mechanism is connected to the output end of the drive mechanism and simultaneously connects the first valve plate and the second valve plate to drive the first valve plate and the second valve plate to perform synchronous movements in opposite directions of rotation. When valve plate one and valve plate two are engaged, they completely block the flow channel inside the valve body.

[0005] Preferably, the linkage mechanism includes a drive rod, a first connecting rod, a first rocker arm, a second connecting rod, and a second rocker arm that are hinged end to end in sequence. The drive rod is fixedly connected to the output end of the drive mechanism. The middle part of the first rocker arm is fixedly connected to the first valve plate, and the first rocker arm rotates around its connection point with the first valve plate. The second rocker arm is fixedly connected to the second valve plate, and the second rocker arm rotates around its connection point with the second valve plate.

[0006] Preferably, the valve body is symmetrically provided with a rotating shaft 1 and a rotating shaft 2, the valve plate 1 is disposed on the rotating shaft 1, the valve plate 2 is disposed on the rotating shaft 2, the end of the rotating shaft 1 extends out of the valve body and is fixedly connected to the middle of the rocker arm 1, and the end of the rotating shaft 2 extends out of the valve body and is fixedly connected to the rocker arm 2.

[0007] Preferably, the valve body is provided with a baffle plate on the upstream side of the first rotating shaft and the upstream side of the second rotating shaft.

[0008] Preferably, the inner wall of the valve body and the windward surfaces of the wind baffle, valve plate one and valve plate two are all provided with a wear-resistant layer.

[0009] Preferably, a mounting base is provided on the outer side of the valve body, and the drive mechanism is mounted on the mounting base.

[0010] Preferably, the valve body is provided with connecting flanges at both the upstream and downstream ends.

[0011] Preferably, the valve body has a square cross-section, and both valve plate one and valve plate two are square plates.

[0012] Preferably, a negative pressure sensor is provided on the upstream side of the first valve plate and the second valve plate, and the negative pressure sensor is used to detect the negative pressure value on the upstream side of the first valve plate and the second valve plate.

[0013] The present invention also provides a control method for the dual-axis driven bellows valve, comprising: Set the target negative pressure value on the upstream side of the valve body: The real negative pressure value on the upstream side of the valve body is collected in real time by a negative pressure sensor; The actual negative pressure value is compared with the target negative pressure value, the valve opening is calculated by the PID algorithm, and control commands are sent to the drive mechanism. The drive mechanism moves and drives valve plate one and valve plate two to rotate synchronously through the linkage mechanism, thereby completing the valve opening adjustment.

[0014] The application of the technical solution of the present invention has the following beneficial effects: This invention employs a dual-axis symmetrical drive, split valve plate structure. Each valve plate is driven by its own rotating shaft, with each shaft bearing the load of only one valve plate. This avoids the situation in single-axis structures where all loads are concentrated on a single shaft, thus significantly reducing the wear rate of each shaft and bushing. Simultaneously, through a linkage mechanism consisting of a sequentially hinged drive rod, connecting rod one, rocker arm one, connecting rod two, and rocker arm two, a single drive mechanism can simultaneously control the synchronous reverse movement of both valve plates. This eliminates the need for a separate drive source for each valve plate, resulting in a compact structure, short transmission path, and reduced transmission backlash and potential failure points.

[0015] This invention features a baffle plate upstream of the rotating shaft. The dust-laden airflow first impacts the baffle plate, and the rotating shaft is located on the leeward side of the baffle plate, effectively preventing direct erosion of the rotating shaft by dust particles. Simultaneously, wear-resistant layers are provided on the inner wall of the valve body, the baffle plate, and the windward surfaces of valve plate one and valve plate two. These wear-resistant layers replace the base material to withstand wear, significantly slowing down the wear rate of the valve's main structure and extending the valve's service life.

[0016] The valve body of this invention is equipped with connecting flanges at both ends, allowing for detachable and fixed connection between the valve body and external pipelines via flange connections, facilitating installation and disassembly. The valve body has a square cross-section, and the valve plate is also square, facilitating the installation of a flat, wear-resistant liner on the inner wall and reducing the difficulty of machining and installing curved liner plates. The drive mechanism is directly fixed to the mounting base on the outside of the valve body, forming an integral unit with the valve body, eliminating the need for additional mounting brackets or bases, reducing installation space requirements, and facilitating maintenance and replacement.

[0017] This invention installs a negative pressure sensor on the upstream side of the valve plate to detect the negative pressure value at the valve inlet. The measured value is used as feedback and the drive mechanism is used as the actuator to form a closed-loop control circuit. The valve opening automatically adjusts according to the change of negative pressure without manual intervention, thus achieving precise control of negative pressure.

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the bellows valve in the open state of the present invention; Figure 2 This is a schematic diagram of the bellows valve in the closed state of the present invention; Figure 3 This is a top view of the bellows valve of the present invention; Figure 4 yes Figure 3 Sectional view at point BB; Figure 5 This is a flowchart of the bellows valve control method of the present invention; Among them, 1. drive mechanism, 2. drive rod, 3. connecting rod one, 4. rotating shaft one, 5. rocker arm one, 6. connecting rod two, 7. rocker arm two, 8. rotating shaft two, 9. negative pressure sensor, 10. valve body, 11. mounting base, 12. valve plate one, 13. connecting flange, 14. round pipe, 15. valve plate two, 16. wind baffle, 17. wear-resistant layer. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more complete description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] Example: See Figures 1-4 This embodiment provides a dual-axis driven bellows valve, including a drive mechanism 1, a linkage mechanism, a valve body 10, a first valve plate 12, and a second valve plate 15. The first valve plate 12 and the second valve plate 15 are both rotatably disposed inside the valve body 10 and are symmetrically arranged. The drive mechanism 1 is disposed on the outside of the valve body 10. The linkage mechanism is connected to the output end of the drive mechanism 1 and simultaneously connects the first valve plate 12 and the second valve plate 15 to drive the first valve plate 12 and the second valve plate 15 to perform synchronous movements in opposite directions of rotation. Specifically, when valve plate 12 and valve plate 25 are engaged (i.e., when valve plate 12 and valve plate 25 are joined to form a plane), the flow channel inside the valve body 10 is completely blocked; when valve plate 12 and valve plate 25 are disengaged (i.e., when valve plate 12 and valve plate 25 are staggered), gas is allowed to flow through the flow channel inside the valve body 10; by adjusting the degree of disengagement between valve plate 12 and valve plate 25, the opening of the valve is adjusted, that is, the size of the flow cross section inside the valve body 10 is adjusted.

[0023] Preferably, the linkage mechanism is located on the outside of the valve body 10. The linkage mechanism includes a drive rod 2, a first connecting rod 3, a first rocker arm 5, a second connecting rod 6, and a second rocker arm 7, which are hinged end to end in sequence. The drive rod 2 is fixedly connected to the output end of the drive mechanism 1. The middle part of the first rocker arm 5 is fixedly connected to the first valve plate 12, and the first rocker arm 5 rotates around its connection point with the first valve plate 12. The second rocker arm 7 is fixedly connected to the second valve plate 15, and the second rocker arm 7 rotates around its connection point with the second valve plate 15.

[0024] In this embodiment, the drive mechanism 1 only needs to drive the drive rod 2 to rotate, which in turn drives the valve plate 12 and the valve plate 15 to rotate synchronously in opposite directions via the connecting rod 3, rocker arm 5, connecting rod 6, and rocker arm 7. With this drive mechanism 1, on the one hand, there is no need to configure separate drive sources for the valve plate 12 and the valve plate 15; on the other hand, the synchronous movement between the valve plate 12 and the valve plate 15 is effective, ensuring that after the valve plate 12 and the valve plate 15 are engaged, they form a good sealing effect on the internal flow channel of the valve body 10.

[0025] Preferably, the valve body 10 is symmetrically provided with a rotating shaft 4 and a rotating shaft 8, both rotatably mounted. A valve plate 12 is mounted on the rotating shaft 4, and a valve plate 15 is mounted on the rotating shaft 8. The end of the rotating shaft 4 extends out of the valve body 10 and is fixedly connected to the middle of the rocker arm 5. The end of the rotating shaft 8 extends out of the valve body 10 and is fixedly connected to the rocker arm 7. In this embodiment, the rotational movement of the rocker arm is directly transmitted to the corresponding valve plate via the rotating shaft. This results in a short transmission path, no additional intermediate parts, and reduced transmission clearance and potential failure points.

[0026] The bellows valve in this embodiment adopts a dual-axis symmetrical drive, split valve plate structure, replacing the traditional single-axis single valve plate structure. The force on the rotating shaft is evenly distributed, completely solving the problems of concentrated force and rapid wear in a single-axis structure, and significantly extending the valve's lifespan. Specifically, in the traditional single-axis structure, all loads are concentrated on one rotating shaft, resulting in severe wear of the bushing and rotating shaft, which can easily lead to valve jamming and air leakage. In contrast, this embodiment uses two symmetrically arranged rotating shafts, shaft 4 and shaft 8, to drive valve plate 12 and valve plate 15 respectively. Each rotating shaft only bears the load of one valve plate, avoiding the situation where all loads are concentrated on one rotating shaft as in the single-axis structure. This reduces the wear rate of each rotating shaft and bushing, and has the advantages of balanced force and smooth rotation.

[0027] Preferably, the valve body 10 is provided with baffles 16 on the upstream side of both the first rotating shaft 4 and the second rotating shaft 8. The surface of the baffles 16 faces the direction of the airflow, and the dust-laden airflow first impacts the baffles 16. The first rotating shaft 4 and the second rotating shaft 8 are located on the leeward side of their respective baffles 16, thereby preventing dust particles from directly impacting the first rotating shaft 4 and the second rotating shaft 8. At the same time, the baffles 16 also have the effect of guiding the airflow, guiding the airflow to pass between the first valve plate and the second valve plate.

[0028] Preferably, the inner wall of the valve body 10 and the windward surfaces of the baffle plate 16, valve plate one 12, and valve plate two 15 are all provided with a wear-resistant layer 17. In this embodiment, all surfaces that are in direct contact with the dust-laden airflow (the inner wall of the valve body 10, the baffle plate 16, the windward surfaces of valve plate one 12, and valve plate two 15) are covered with a wear-resistant layer. During the dust scouring process, the wear-resistant layer 17 replaces the base material to bear the wear, thereby slowing down the wear rate of the valve body structure. Specifically, the wear-resistant layer 17 is a wear-resistant liner or a wear-resistant weld overlay, and the wear-resistant liner is made of high-chromium wear-resistant alloy or ceramic composite material.

[0029] Preferably, the valve body 10 is provided with a mounting base 11 on its outer side, and the drive mechanism 1 is disposed on the mounting base 11, so that the drive mechanism 1 and the valve body 10 form an integral whole, without the need for additional mounting brackets or bases, reducing the installation space occupied, and facilitating the maintenance, disassembly and replacement of the drive mechanism 1.

[0030] Preferably, the valve body 10 is provided with connecting flanges 13 at both the upstream and downstream ends, and the valve body 10 is detachably fixed to the external round pipe 14 by means of flange connection, which facilitates installation and disassembly.

[0031] Preferably, the valve body 10 has a square cross-section, and both valve plate 12 and valve plate 15 are square plates. The square structure facilitates the laying of flat wear-resistant liners on the inner wall of the valve body 10, reducing the difficulty of processing and installing curved liner plates; at the same time, the square valve plate 12 and valve plate 15, when matched with the valve body 10, can achieve a better sealing effect, reducing the difficulty of matching the valve plate with the valve body 10.

[0032] Preferably, a negative pressure sensor 9 is provided on the upstream side of the first valve plate 12 and the second valve plate 15. The negative pressure sensor 9 is used to detect the negative pressure value on the upstream side of the first valve plate 12 and the second valve plate 15. The negative pressure sensor 9 is installed on the upstream side of the valve plate (i.e., the side where the airflow comes from). The negative pressure sensor 9 detects the negative pressure value at the valve inlet, which facilitates the adjustment of the valve opening based on the real-time detected negative pressure value.

[0033] Preferably, the length of the second connecting rod 6 is adjustable to facilitate the installation of the connecting rod mechanism and reduce manufacturing difficulty. The second connecting rod 6 includes an intermediate sleeve, an end segment one, and an end segment two. The end segment one and the end segment two are threaded to both ends of the intermediate sleeve, respectively. Locking nuts are provided between the end segment one and the intermediate sleeve, and between the end segment two and the intermediate sleeve, for fastening, thereby achieving the purpose of adjusting the length of the second connecting rod 6. Furthermore, the internal threads at both ends of the intermediate sleeve have opposite directions, while the external threads of the end segment one and the end segment two are correspondingly provided. This allows the end segment one and the end segment two to extend or retract simultaneously when the intermediate sleeve rotates. Even further, the intermediate sleeve is provided with a hexagonal prism segment to facilitate the use of wrenches or other tools to tighten the intermediate sleeve.

[0034] Preferably, the drive mechanism 1 outputs rotational motion. After the end of the drive rod 2 is fixedly connected to the output end of the drive mechanism 1, the drive rod 2 follows the output end in rotational motion, thereby driving the connecting rod 3, rocker arm 5, connecting rod 6, and rocker arm 7 to move together. In this embodiment, the drive mechanism 1 is a motor. Of course, those skilled in the art can use other types of drive devices to meet the power output requirements.

[0035] See Figure 5 This embodiment also provides a control method for the dual-axis driven bellows valve, including: Set the target negative pressure value on the upstream side of valve body 10: The real negative pressure value on the upstream side of the valve body 10 is collected in real time by the negative pressure sensor 9; The actual negative pressure value is compared with the target negative pressure value, the valve opening is calculated by the PID algorithm, and the control command is sent to the drive mechanism 1. The drive mechanism 1 operates and drives valve plate 12 and valve plate 15 to rotate synchronously through the linkage mechanism, thereby completing the valve opening adjustment.

[0036] In this embodiment, the control method uses the actual negative pressure value measured by the negative pressure sensor 9 as feedback and the drive mechanism 1 as the actuator to form a closed-loop control circuit. The valve opening automatically adjusts according to changes in negative pressure without manual intervention, maintaining the negative pressure near the target negative pressure value.

[0037] Specifically, in order to prevent frequent adjustments to the valve opening, the target negative pressure value in this embodiment is a range value. That is, when the actual negative pressure value is within the range value, it is considered that there is no need to adjust the valve opening. Only when the actual negative pressure value exceeds the range value is it necessary to link the drive mechanism 1 to adjust the valve opening.

[0038] Preferably, this embodiment also detects faults such as overload and jamming by real-time monitoring of the operating current and torque of the drive mechanism 1. For example, if the current or torque exceeds a set threshold for a continuous period of time t, an overload or jamming fault is considered to exist, and an early warning and shutdown protection are immediately triggered.

[0039] Application Cases A steel mill 180 The original wind box valve of the belt sintering machine was a single-shaft connecting rod butterfly valve, which suffered from frequent wear of the bushing, serious air leakage, and lagging negative pressure regulation. It was replaced with the valve device of this embodiment, with a negative pressure sensor 9 installed and connected to the sintering PLC intelligent control terminal, setting the target negative pressure range to 8000-10000 Pa.

[0040] After operation, the wear of the dual-shaft split structure shaft in this embodiment is reduced by 85%, and the installation space is reduced by 40% after the original complex linkage transmission mechanism is eliminated; the negative pressure sensor monitors the data in real time, the valve opening is automatically interlocked and adjusted, the negative pressure fluctuation is controlled within ±300Pa, and the valve service life is extended from 6 months to 24 months.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A biaxially driven windbox valve, characterized by, The device includes a drive mechanism (1), a linkage mechanism, a valve body (10), a valve plate one (12), and a valve plate two (15). The valve plate one (12) and the valve plate two (15) are rotatably disposed inside the valve body (10) and are symmetrically disposed. The drive mechanism (1) is disposed outside the valve body (10). The linkage mechanism is connected to the output end of the drive mechanism (1). The linkage mechanism is simultaneously connected to the valve plate one (12) and the valve plate two (15) to drive the valve plate one (12) and the valve plate two (15) to perform synchronous movements in opposite directions of rotation. After the valve plate one (12) and valve plate two (15) are engaged, the flow channel inside the valve body (10) is completely blocked.

2. The dual-shaft driven bellows valve according to claim 1, characterized in that, The linkage mechanism includes a drive rod (2), a first connecting rod (3), a first rocker arm (5), a second connecting rod (6), and a second rocker arm (7) that are hinged together at their ends. The drive rod (2) is fixedly connected to the output end of the drive mechanism (1). The middle part of the first rocker arm (5) is fixedly connected to the first valve plate (12), and the first rocker arm (5) rotates around its connection point with the first valve plate (12). The second rocker arm (7) is fixedly connected to the second valve plate (15), and the second rocker arm (7) rotates around its connection point with the second valve plate (15).

3. The dual-shaft driven bellows valve according to claim 2, characterized in that, The valve body (10) is symmetrically provided with a rotating shaft 1 (4) and a rotating shaft 2 (8) for rotation. The valve plate 1 (12) is disposed on the rotating shaft 1 (4) and the valve plate 2 (15) is disposed on the rotating shaft 2 (8). The end of the rotating shaft 1 (4) extends out of the valve body (10) and is fixedly connected to the middle of the rocker arm 1 (5). The end of the rotating shaft 2 (8) extends out of the valve body (10) and is fixedly connected to the rocker arm 2 (7).

4. The dual shaft driven bellow valve of claim 3, wherein, The valve body (10) is provided with a baffle plate (16) on the upstream side of the first rotating shaft (4) and the upstream side of the second rotating shaft (8).

5. The dual shaft driven bellow valve of claim 4, wherein, The inner wall of the valve body (10) and the windward surfaces of the wind baffle (16), valve plate one (12) and valve plate two (15) are all provided with wear-resistant layers (17).

6. The dual shaft driven bellow valve of claim 1, wherein, The valve body (10) is provided with a mounting base (11) on its outer side, and the drive mechanism (1) is mounted on the mounting base (11).

7. The dual shaft driven bellow valve of claim 1, wherein, The valve body (10) is provided with connecting flanges (13) at both the upstream and downstream ends.

8. The dual shaft driven bellow valve of claim 1, wherein, The valve body (10) has a square cross-section, and both valve plate one (12) and valve plate two (15) are square plates.

9. The dual shaft driven bellow valve of any of claims 1-8, wherein, A negative pressure sensor (9) is provided on the upstream side of the first valve plate (12) and the second valve plate (15). The negative pressure sensor (9) is used to detect the negative pressure value on the upstream side of the first valve plate (12) and the second valve plate (15).

10. A method of controlling a biaxially driven windbox valve as defined in claim 9, characterized by, include: Set the target negative pressure value on the upstream side of valve body (10): The real negative pressure value on the upstream side of the valve body (10) is collected in real time by the negative pressure sensor (9); The actual negative pressure value collected is compared with the target negative pressure value, the valve opening is calculated by PID algorithm, and control commands are sent to the drive mechanism (1). The drive mechanism (1) moves and drives valve plate one (12) and valve plate two (15) to rotate synchronously through the linkage mechanism to complete the valve opening adjustment.

Images