What Is a Chain Conveyor?

A chain conveyor is a conveyor that uses a chain to pull, load, or carry materials such as slat, metal mesh belt and roller table installed on the chain. Can be divided into chain type, chain plate type, chain net type and slat type.

According to the different load-bearing surfaces installed on the chain, it can be divided into: chain type / chain plate type / chain net type / slat type / chain bucket type / pallet type / carriage type.

Application: Widely used in food, canned food, pharmaceuticals, beverages, cosmetics and washing supplies, paper products, condiments, dairy industry and tobacco, etc. for automatic conveying, distribution, and on-line conveying of subsequent packaging. ^[1]

1. Large conveying capacity and efficient

Problem analysis and technical improvement: As an important equipment for the collection and transportation of finished materials, the chain conveyor is composed of 9 7.5-meter chain links, 3 drive shafts with sprocket wheels, and a drive motor reducer. The chain bypasses the sprocket on the drive shaft and the head and tail sprocket on the chain to form a closed ring. The chain is driven by the chain to carry the steel continuously. The drive of the chain is completed by the transmission device. The motor is started and the power is transmitted through the reducer. The main shaft equipped with a sprocket is driven by the sprocket to move the chain to achieve the purpose of conveying steel. Due to the increase in production rhythm, the conveyor is often overloaded or the transportation is blocked, which increases the running resistance and the motor runs overload. In order to meet the requirement that the finished material can not be stained with oil, the transmission bearings cannot be lubricated in time after long-term use, and the motor power is increased, which causes the motor to burn out and crack teeth. The main drive sprocket of the chain conveyor is one-piece. It is hot-mounted on the drive shaft and fixed by a positioning pin. During relatively large impact movements, the relative movement between the sprocket and the drive shaft often occurs, causing the sprocket and the Worn driveshaft. Make the 9 groups of chain actions inconsistent, affecting transportation. Due to the sharp increase in production rhythm, the failure rate of the mechanism also increased sharply. In the end, the sprocket and the drive shaft had to be firmly welded together, so that the originally replaceable equipment became a one-time use. Secondly, due to the constant wear and tear of the sprocket during long-term use, the gear is prone to wear and tear, causing the sprocket and chain to engage instably. High intensity.

1Improved driving method and load capacity

Redesign the transmission method, install another transmission shaft on the other side of the transmission shaft, install the motor base according to the site conditions, and reselect the driving motor. Change the original one-way drive to two-way drive and increase the frequency converter to ensure the service life of the motor and increase the load capacity of the conveyor.

2 selection of transmission bearings

Ensure that the conveyor runs smoothly. Whether the inner bearing of the sprocket moves freely is an important condition for the normal operation of the conveyor. However, in the actual site, the gap between the bearing and the pin is often stuffed with iron oxide and other debris until it rusts, making it unable to rotate freely and in dry friction with the chain, causing the pin and sprocket to wear, causing the chain to break and jam. Die and affect production. In order to keep the bearings in good lubrication conditions and normal working environment, re-select bearings with seals to prevent lubricant leakage and intrusion of dust, water vapor or other dirt, and give full play to the bearing's working performance and extend its service life. Bearing sealing device refers to the installation of sealing elements on the rotating shaft or the hole of the box, such as felt rings, rubber seals, covers, mysterious shaft stops, etc., its role is to protect the bearings from external dust and dirt , Metal particles, moisture, acid gas and other debris intrude into the bearing. If the bearing is poorly sealed and external debris intrudes, the working condition of the bearing will be significantly deteriorated, and the service life of the bearing will be significantly reduced.

Another function of the bearing seal is to prevent grease from leaking from the bearing components. If the oil leaks, it will quickly damage the normal lubrication of the bearing and cause the bearing to burn out due to heat; in addition, a bad sealing device not only causes waste due to oil leakage, but also pollutes mechanical equipment and processed products. Therefore, for the equipment to operate normally, the bearing must have a good sealing device.

The following factors should be considered when selecting the type of bearing sealing device: (1) the working environment of the bearing; (2) the structural characteristics of the bearing components; (3) the speed of the bearing (the peripheral speed of the bearing); (4) the lubricant of the bearing Type (lubricating oil or grease); (5) operating temperature of the bearing; (6) manufacturing cost.

External seals are divided into two types: non-contact and contact. The description is as follows: (1) The contact seal is exactly what the name implies: the seal cover is in contact with the bearing parts that have relative movement without any gap. In this seal form, due to the direct contact between the seal and the mating part, frictional heat is generated during rotation, and lubrication problems are easy to occur. The contact surface is easy to wear, which results in a reduction in the sealing effect of the bearing and the quality of the bearing cannot meet the requirements . Therefore, contact sealed bearings are only suitable for medium and low speed working environments. (2) Non-contact seal is a seal in which the seal and the bearing parts moving relative to each other do not contact, and there is an appropriate gap in the middle. This type of seal hardly generates frictional heat during the rotation of the bearing, and the seal cap is not worn. This form is suitable for high-speed and high-temperature working environments. The smaller the gap of the non-contact seal, the better. According to the requirements of the bearing working conditions and working environment on the degree of sealing, 2RS sealed bearings are selected. In addition, the bearing will not be hardened by the accumulation of impurities, and thus the life of the bearing is prolonged.

3Improve the connection

Redesign the transmission shaft and the split sprocket. The sprocket is connected by bolts and fixed on the transmission shaft with the positioning key. The original integrated connection mode of the drive shaft and the sprocket was changed to a split connection. Quickly replace sprocket teeth after they are worn. ^[2]