The flap valve of cement kiln cyclone preheater with decomposing furnace system is a kind of high temperature resistant air lock discharge device, which can automatically open and close the valve by using the self weight of material flow. The flap valve not only needs to ensure that the feed pipe of preheater can discharge materials smoothly under high temperature condition, but also plays the role of air lock and sealing. Because of its simple structure and no power, it is widely used in preheater system. However, if the flap valve in the preheater system is not designed properly and the maintenance is inconvenient, it will easily lead to the inflexible action and burning of the valve plate, the peeling and blocking of the blanking pipe, and the cross wind of the upper and lower parts, which will increase the heat consumption of the system, affect the product quality and the operation rate of the equipment.
Nanjing paifeite Machinery Co., Ltd. has long paid attention to the actual use effect of flap valve at home and abroad, analyzed the existing problems, put forward solutions, integrated into the new design concept, and developed a new high temperature resistant fretting flap valve with novel appearance, reliable structure, stable performance and convenient maintenance (Patent No.: 201921151748.6 Patent name: a new high temperature resistant fretting flap valve).
1、 The structure of the high temperature resistant micro valve plate valve the main components of the high temperature resistant micro valve plate valve are: 1 valve shell with pre welded anchor, 2 valve plate and valve shaft with high temperature resistance, 3 bearing and heavy bearing seat, 4 valve shaft seal, 5 heavy hammer counterweight, 6 sector plate regulator, 7 poke hole, 8 access door, etc.
2、 Features of high temperature resistant fretting 01 at present, the main specifications and models of the flap valve designed are: φ 630, φ 700, φ 850, φ 900, φ 1000, φ 1100, φ 1200, etc., which can be customized according to the specifications of the customer's production line, applicable to various types of preheater blanking tube flap valve of 1500t / D ~ 12000t / d cement production line.
02 the back cover of the valve body is bolted to the valve body, which is convenient for maintenance and disassembly. The back cover can be removed, and the valve plate and valve shaft inside the valve body can be moved out of the valve body as a whole for internal inspection and cleaning of crusts. The valve plate is easy to be disassembled and replaced. There is an observation door on the back cover for easy observation and fastening of internal bolts.
03 valve shell is installed with maintenance access door, the door frame is sealed with graphite packing without air leakage, the explosion-proof door is sealed with labyrinth design, the movable bolt is locked, and the wrench is unnecessary.
A φ 159 poke hole cover is installed at the lower part of valve 04 shell, which is convenient to remove the crusting and stacking at the discharge port in production.
05 valve plate is made of high-quality heat-resistant steel. The valve plate material is zg40cr25ni20si2. The arrangement of reinforcing rib of valve plate is more reasonable and the strength is higher.
06 valve shaft support adopts rolling bearing, the shaft seal is graphite packing and gland, the sealing form is labyrinth seal and asbestos packing, to ensure good sealing of the valve body, the contact surface between valve plate and valve seat is processed by CNC vertical lathe, and the joint is tight.
07 external bearing is an imported brand. Kluber be 41-1501 high temperature grease is injected during the initial installation to ensure that the valve shaft can rotate flexibly and extend its service life under high temperature conditions.
08 valve plate has short moving distance, small swing angle of valve rod and high frequency, which makes blanking uniform and is not easy to cause internal air leakage.
09 shaft sleeve is equipped with a sector hammer rod connecting plate and a counterweight adjuster, which is convenient to adjust the torque of the valve rod and the hammer. The counterweight is accurate, which can ensure that the hammer rod can adjust the installation position at any time during tilting and vertical installation of the flap valve, and ensure the balance between the valve plate and the counterweight rod.
10. The valve shell is provided with stiffeners to improve the strength of the shell. The flap valve is supplied with matching upper and lower interface flanges.
11 the lower part of the flap valve shell is designed as an eccentric structure, and the space under the valve body is increased, which ensures that there is enough rotating space when the valve plate is slightly opened, and at the same time, the heat-resistant steel sealing ring is added to enhance the sealing effect of air lock.
12. During manufacturing, the high temperature resistant anchor parts (if necessary, the anti skinning and heat insulation pouring materials can be prefabricated) shall be welded in advance in the valve shell to avoid welding after the flap valve is delivered to the site, which will cause welding traces on the shell, thus causing the shell paint to fall off.
13. After manufacturing in the factory, carry out derusting treatment, and then spray high-temperature primer and high-temperature finish.
Contact us
Tel: 025-89611918 address: 3401, Fuxin international building, No. 359, Hongwu Road, Qinhuai District, Nanjing East official website: www.paifeite.com email: liqi@paifeite.com
----------Writer: Technology Department --- Shen Ke, Wu Huisheng, Zhang Deshun