Banana screen is mainly composed of spring, motor, box type vibrator, intermediate shaft, drive shaft, screen frame, screen beam, screen plate rail seat, polyurethane screen plate, etc. Banana screen is designed according to the principle of equal thickness screening, using continuous multi-angle screening surface, suitable for the type screening containing a large number of fine particles. The screen surface is composed of 6 sections with different inclination angles, the inclination angle of the screen surface at the feeding end is up to 25°, and the inclination angle of the screen surface at the discharging end is gradually reduced to 5°. The slope angle of banana screen screen is gradually decreasing, so that the flow rate of the material is different when passing through the different screen surfaces. The tilt angle of the inlet end is large, the flow rate is large, and the fine particle material can be near the surface earlier and pass through the screen hole at high speed, which reduces the thickness of the material layer, and the screening efficiency is increased by 50% to 100% compared with the traditional grading screen. 1. Main performance of banana screen
Screen size 22mm×8mm, screen angle 6°, amplitude 9~ 1mm, motor power 55kw, maximum processing capacity 3200t/h; the material is uniformly fed, the feeding speed is 0.5~0.8m/s, and the thickness of the material layer is made, the feeding particle size is -12mm, and the maximum height of the material drop is not higher than 500mm.
2. The main advantage of banana screen
(1) The structure is simple and compact, the stiffness is large, the strength is high, the force distribution is balanced, and the safety factor is high.
(2) Light weight, small power, large vibration strength, high screening efficiency and large material handling capacity.
(3) The use of eccentric block external box exciter, double-side box vibrator coaxial connection, rotation at the same speed to ensure the same direction of excitation force, negative body and box exciter long service life.
(4) The screen plate is made of polyurethane, with low noise and long service life.
3. Problems in banana screen production
(1) The bearing seat and bearing of the main transmission shaft of the transmission device are easy to damage.
(2) There is abnormal sound in the exciter, and even damage in serious cases.
(3) The cross universal coupling has abnormal noise and damage.
(4) After a period of use, banana screen screening efficiency decreases, screening
Lower product decreased.
(5) Uneven discharge from the discharge port, pile material to one side.
4.banana screen main faults and analysis
(1) The equipment management system and system are not established and improved, the equipment management responsibility is not clear, and the important spare parts ledger is not fully established.
(2) Post inspection and professional spot inspection are not in place, and failures such as abnormal sound, abnormal vibration, and abnormal sound are not found and dealt with in time.
(3) Lubrication and maintenance are not carried out in strict accordance with the five standards of lubrication, and lubrication is not timely.
(4) The frequency of daily equipment joint inspection is less, it is merely a formality, and the supervision of equipment management is not in place.
5. Improvement measures
(1)Transformation of banana screen bearing seat. The original bearing seat is a two-stud bearing seat with equal diameter holes. The upper cover of the bearing seat is fixed with the lower part of the bearing seat by 2 bolts, and the lower part of the bearing seat is fixed with the frame by 2 bolts. Although it has the advantages of easy disassembly and installation, there are many fastening links in the bolt connection, and the radial bearing capacity is weak. Under the joint action of the periodic vibration of banana screen and the tension of the angle belt, it is easy to appear bolt loosening, screw thread damage, bearing seat damage, bearing damage, etc. Once the parts are damaged, they must be stopped for treatment, and even parking accidents occur in serious cases. After research, the bearing seat was changed into one piece, the material was changed to 45 steel, the radial thickness of the bearing seat was increased, the original 2 sets of bolt fastening links were reduced to 1 set of bolts directly fastened with the frame, the strength of the bearing seat was increased, the radial bearing capacity was increased, and the tension force of the angle belt was reasonably adjusted to ensure that the angle belt transmission was smooth and non-slipping, and the service life of the bearing seat and bearing was extended. Reduce staff maintenance labor intensity.
(2) Strengthen the daily maintenance of box-type exciter. When assembling the shaker, ensure that the assembly is correct, and the contact surface between the shaker and the bracket must be clean and tidy before assembly; after the initial operation of the box shaker for 50h, the bolt tightening should be checked, and then check once every 3 months: The correct selection of lubricating oil, according to the manufacturer's instructions and production requirements, the selection of mobil vg68 gear oil, mobil 600xp68 or kunlun heavy load industrial gear oil kg68, while ensuring a reasonable amount of filling oil: Strengthen daily inspection.
(3)Banana screen cross universal coupling abnormal noise treatment. Replace the short cross universal coupling of banana screen, solve the problem of abnormal noise of banana screen, ensure the normal use of banana screen and normal power output.
(4) Improve the professional quality of equipment management personnel, and build a professional and high-quality management and operation team. Constantly improve the equipment pipe
Management of professional skills and sense of responsibility, hiring manufacturers professional and technical personnel to carry out point-to-point explanation training; carry out targeted training for post workers and equipment maintenance workers, improve the skills and operation level of front-line workers, and provide technical support for the smooth completion of production tasks: Establish a corresponding incentive mechanism to stimulate employees' enthusiasm and initiative for their own work, and ensure the effective development of equipment management; strengthen the joint inspection of equipment, adhere to the activity of equipment joint inspection once a week, timely summary and feedback of equipment hidden dangers found, ordered rectification within a time limit, timely elimination of equipment hidden dangers, and ensure the safe operation of equipment
(5) Strengthen the inspection of banana screen, and strictly implement the "Six fixed" Work method of equipment inspection: Fixed person, fixed point, fixed quality, quantitative, fixed method and fixed period. Establish and improve the equipment inspection system, clarify the equipment responsible person and job responsibilities, and ensure that each equipment has a dedicated responsible person. At the same time, determine the inspection route, formulate equipment inspection records, increase the inspection frequency of key parts, carefully perform inspection records and check operation parameters, and timely discover and deal with problems. Do a good job of seasonal management of banana screen. According to the degree of cold and frost protection of banana screen, it is equipped with heating materials such as electric heating, cotton door curtains, and tropical heating materials in winter, and strengthen the inspection of unattended equipment and pipelines such as side, far and alone.
(6) Strengthen the lubrication management of banana screen. For the main lubrication components of banana screen, formulate a detailed banana screen "Five fixed lubrication table" According to the "Five fixed" Principle of equipment lubrication, including fixed person, fixed point, regular time, fixed quality and quantitative quantity, and specify the person responsible for equipment lubrication. Lubricate and maintain the modified parts according to the five requirements of lubrication.
(7) The homogenization plate homogenization device is a new improvement of the nozzle type homogenization device, which effectively overcomes the drawbacks of the original nozzle homogenization device, changes the point homogenization into a planar homogenization, and has achieved great improvement and promotion in service performance, life and maintenance.
(8) The original manual supply risk control system is improved to plc electronic control, which improves the level of automation, reduces the amount of manual work, optimizes the discharge spray mode, and improves the discharge efficiency. The application of homogenized board in the silo has broken through the conventional thinking mode, made a new interpretation of the process from a new angle, introduced different solutions, and achieved better application results.
The above are some general introductions and modifications of banana screen, which improve its production efficiency and reduce the operating cost.