| 摘要 |
A tire uniformity machine includes a chucking apparatus (8) that accommodates tires (13) of varying bead width spacings. The chucking apparatus (8) includes a lower chuck assembly (10) positioned below a upper chuck assembly (12). The lower chuck assembly (10) includes an inner spindle apparatus (20) that is rotatably received within an outer spindle apparatus (22). The inner (20) and outer (22) spindle apparatus are carried by the piston rods (38 and 54) of a dual piston cylinder (52). An elongate nose cone (26) of the inner spindle apparatus (20) is carried by the inner piston rod (38), while the outer spindle apparatus (22) is carried by the outer piston rod (54). The dual piston cylinder (52) is operable to independently raise and lower the inner (38) and outer (54) piston rods. The operation of the dual piston cylinder (52) is controlled by a low pressure valve (110), a high pressure valve (112) and a servo valve (114). These valves are, in turn, controlled by a programmable logic controller (104) that follows a sequencing program and instructions from and electric control unit (100). During operation, a position sensor (120) constantly obtains the position of the chucking apparatus (8) and directs this information to the programmable logic controller (104). The programmable logic controller (104) accepts the position information and directs the dual piston cylinder (52) to locate the chucking apparatus (8) at a given position depending on the bead width spacings of the tire (13) to be tested.
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