Cold air suction valve for sintering of main air drafting and guiding pipe

Abstract

The invention discloses a cold air suction valve for sintering of a main air drafting and guiding pipe. The cold air suction valve comprises a valve body and an insertion board. The longitudinal section of the inner wall of the valve body is rectangular. Connecting flanges are arranged at the two ends of the valve body respectively. The inner side of the top wall of the valve body is provided with an upper sliding groove in the width direction. The inner side of the bottom wall of the valve body is provided with a lower sliding groove in the width direction. The top of the insertion plate is located in the upper sliding groove. The bottom of the insertion plate is located in the lower sliding groove. A rolling body is arranged between the bottom of the insertion plate and the bottom of the lower sliding groove. The width of the insertion plate is greater than or equal to the width of the inner wall of the valve body. Due to the fact that the insertion plate slides freely in the upper sliding groove and the lower sliding groove, the rolling body can guarantee flexible sliding of the insertion plate, and the sliding direction of the insertion plate is the horizontal direction and is perpendicular to the air inlet direction, in the opening process and the closing process of the cold air suction valve, the valve body can not vibrate, both the opening process and the closing process are very stable, equipment is not prone to damage, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of smelting and sintering technology, in particular to a cold air intake valve of a sintering main air-exhaust air duct. Background technique [0002] During the sintering production process, the generated high-temperature exhaust gas enters the electrostatic precipitator through the main exhaust air duct, and then is discharged through the main exhaust fan. Due to the fluctuation of the mixture moisture, coke powder particle size, quicklime ratio and other factors, the final temperature of the sinter is too high, and the high-temperature gas enters the main exhaust fan. After a long time through the fan and other equipment, the performance of the equipment will be damaged to a large extent, and even an accident will occur. The function of the cold air intake valve is to adjust the gas temperature in the main exhaust air duct in time to protect the equipment. [0003] like figure 1 As shown, the cold air ...

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Problems solved by technology

[0004] Because a large amount of cold air enters the pipe network system, the current of the motor will increase or even overload, and the rapid cooling will also cause some damage to the equipment itself. Therefore, it is necessary to slowly open the flap 21 when blending the cold air. The opening angle of the flap 21 is 15°~ 40° is advisable; the opening direction of the flap 21 is facing the direction of the air intake, the air intake resistance is large and unstable, the flap 21 drives the whole valve body 20 to vibrate, wherein, when the opening angle of the flap 21 is about 30° , the vibration is more violent, and the equipment is easily damaged. Among them, the electric actuator 27 is the most vulnerable

[0005] A rubber sealing strip is arranged in the groove of the valve seat 22. Since the rubber sealing strip is embedded in the groove of the valve seat 22, the fixing is not firm. When the valve body 20 vibrates violently, the rubber sealing strip is easy to fall off; When 21 is closed, it cannot be guaranteed that the flap 21 fits tightly with the rubber sealing strip, and the rubber sealing strip is easily damaged

When the valve body 20 vibrates violently, components such as the connecting plate 23, the flap shaft 24, the rocker arm 25 and the connecting rod 26 are easily deformed and broken, resulting in a loose fit between the flap 21 and the valve seat 22 and serious air leakage

[0006] Therefore, the flap-type cold air suction valve has the following problems: the flap is difficult to open, and the valve body generates a large vibration during the opening process, which is easy to damage the equipment and has a short service life; poor sealing

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