The chain conveyor, as an important equipment for collecting and transporting finished materials, consists of 9 7.5-meter chain channels, 3 drive shafts with sprockets, and 1 drive motor reducer. The chain wraps around the sprocket on the drive shaft and the head and tail sprockets on the chain track to form a closed loop. With the traction of the chain, it carries and continuously transports steel. The driving of the chain is completed by the transmission device. The electric motor starts and transmits power to the main shaft equipped with sprockets through the reducer. Under the driving of the sprocket, the chain moves to achieve the purpose of transporting steel. Due to the increase in production pace, conveyors often experience overloading or jamming, resulting in increased operational resistance and motor overload operation. In order to meet the requirement that finished materials should not be contaminated with oil, the transmission bearings cannot be lubricated in a timely manner after long-term use, which also leads to an increase in motor power and the occurrence of motor burnout and tooth breakage. The main drive sprocket of the chain conveyor is integrated and fixed on the drive shaft by a locating pin. During movements with significant impact, relative movement between the sprocket and the drive shaft often occurs, causing wear and tear on both the sprocket and the drive shaft. Causing 9 sets of chain actions to be inconsistent, affecting transportation. Due to the significant increase in production pace, the failure rate of the mechanism has also sharply increased, forcing the sprocket and transmission shaft to be firmly welded together, turning the originally replaceable equipment into a disposable one. Secondly, due to continuous wear and tear during long-term use, the sprocket is prone to wear and tear, causing unstable meshing between the sprocket and the chain. If the sprocket needs to be replaced, the entire transmission shaft must be removed before replacement, which has a long impact time and high labor intensity for workers.
- Improve the driving mode and enhance the load capacity
Redesign the transmission method, install another transmission shaft on the other side of the transmission shaft, and install the motor base according to the site conditions, and reselect the drive motor. Change the original one-way drive to two-way drive, and add a frequency converter to improve the load capacity of the conveyor while extending the service life of the motor. - Selection of transmission bearings
The conveyor runs smoothly. Whether the bearing inside the sprocket can move freely is an important condition for the normal operation of the conveyor. However, in actual practice, the gap between the bearing and the pin shaft is often filled with impurities such as iron oxide scale, causing rust and death, making it unable to rotate freely and in a dry friction state with the chain, resulting in wear of the pin shaft and sprocket, causing chain breakage and jamming, and affecting production. In order to maintain good lubrication conditions and a normal working environment for bearings, bearings with built-in seals are re selected to prevent lubricant leakage and the intrusion of dust, water vapor, or other pollutants, fully exerting the working performance of bearings and extending their service life. Bearing sealing device refers to a sealing element installed on the rotating shaft or box hole, such as felt ring, rubber sealing ring, stopper cover, labyrinth shaft stopper, etc. Its function is to protect the bearing and prevent external dust, dirt, metal particles, moisture, acid gas and other debris from entering the interior of the bearing. If the bearing seal is poor and external debris invades, the working condition of the bearing will significantly deteriorate, and the service life of the bearing will be significantly reduced.
Another function of the bearing sealing device is to prevent grease leakage from the bearing components. If there is oil leakage, it will quickly damage the normal lubrication of the bearing, causing the bearing to burn out due to heating; In addition, poor sealing devices not only cause oil leakage and waste, but also contaminate mechanical equipment and processed products. Therefore, in order to ensure the normal operation of the equipment, the bearings must have good sealing devices.
When selecting the type of bearing sealing device, the following factors should be considered: (1) the working environment of the bearing; (2) Structural characteristics of bearing components; (3) The rotational speed of the bearing (circumferential speed of the bearing); (4) Types of lubricants for bearings (lubricating oil or grease); (5) The working temperature of the bearing; (6) Manufacturing cost.
External sealing is divided into non-contact and contact types. The description is as follows: (1) Contact seal, as the name suggests, is a sealing cover that comes into contact with the bearing parts that have relative motion with it without any gap. This sealing form generates frictional heat during rotation due to direct contact between the sealing element and the mating element, which easily leads to lubrication problems. The contact surface is prone to wear, resulting in a decrease in the sealing of the bearing and a failure to meet the required quality of the bearing. Therefore, contact sealed bearings are only suitable for medium and low-speed working environments. (2) Non contact sealing is a type of sealing in which the bearing components that move relative to each other do not come into contact, and there is appropriate clearance in the middle. This sealing form produces almost no frictional heat during the rotation of the bearing, and the sealing cover is not worn. This form is suitable for high-speed and high-temperature working environments. The smaller the gap of non-contact sealing, the better. Based on the working condition of the bearing and the requirements of the working environment for sealing degree, 2RS type sealed bearings are selected. To prevent the bearing from hardening due to the accumulation of impurities and thus extend its lifespan.
- Improve the connection method
Redesign the transmission shaft and split sprocket, with the sprockets bolted together and fixed to the transmission shaft using positioning keys. Change the original integrated connection method between the drive shaft and sprocket to a split type connection. Replace the sprocket teeth after wear.
Typical FU chain conveyors include: waste incineration slag, fly ash, cement products, cement raw materials, yellow sand, limestone powder, coal powder, coke powder, fly ash, wood chips, crushed ice, stone powder, urea, synthetic fertilizers, soap powder, soda ash, soda ash, graphite, plastic pellets, polyethylene, resin, potassium sulfate, ammonium sulfide, clay powder, quartz sand, iron ore powder, furnace powder, furnace slag, salt, starch, wheat, cottonseed, crushed feed, maltose, rice, corn, soybeans, etc.
Chain conveyor has low energy consumption: by utilizing the internal friction of materials, most of the work done by moving parts is converted into work. Using chain hooks for conveying reduces the resistance of materials to it, resulting in energy consumption only 30% to 60% of that of screw conveyors.
