Closed sampler for oil refining and chemical engineering device

The utility model provides a closed sampler for an oil refining and chemical engineering device, which comprises a fixing assembly, and the fixing assembly comprises a closed sampler body, a placing plate, a cavity, a fixing rod, a toothed plate, a rotating rod, a gear, a fixing plate, a limiting rod, a moving plate, a supporting rod, an arc-shaped clamping plate and a connecting block; a placement plate is arranged on the left side of the closed collector body, a cavity is formed in the placement plate, and fixing rods are fixedly mounted on the inner walls of the two sides of the cavity. A motor drives a gear to rotate through a rotating rod, the gear drives a moving plate to move through toothed plates, the moving plate drives an arc-shaped clamping plate to move through a supporting rod, the arc-shaped clamping plate fixes a sampling bottle, the motor rotates reversely, the motor drives the toothed plates to move through the gear, and the two toothed plates move in the direction away from each other; the