Bush roller chain model convenient to demount, mount and close

The invention belongs to a chain, discloses a bush roller chain model convenient to demount, mount and close and aims at solving the technical problem of manually demounting and mounting a bush roller chain and closing to form an annular chain and helping to know internal structure and assembling method of the bush roller chain. The bush roller chain model is composed of pin shafts, bushes, rollers, inner chain plates, outer chain plates, grooved transition chain links, holed transition chain links, transition chain plates, spring clamps and cotters. The bush roller chain model is characterized in that one pin shaft is mounted in each of two holes of each outer chain plate, one bush with the inner chain plates mounted at two ends sleeves each pin shaft in a hollow manner, one roller sleeves each bush in a hollow manner, one outer chain plate is mounted at the other end of each pin shaft, one chain link is assembled, and a chain can be formed by repeating the above action; two ends of the chain are connected b