La description

 Pneumatic Bus Door Cylinder consists of:

1. Arm asm(including arms, door pillar asm, upr-bracket, tie rod, angular connective irons, door/frame wedges etc.)

2. Pneumatic door mechansim and relevant control units(e.g. emergency valve, solenoid valve, switch)

 

Technical Data & Specifications

 

 

 

The cylinder asm consists of two parts- the lower part is a cylinder with cushioning; the upper part is a set of screwing mechanism.

The lower part:in the cylinder the up&down movement of piston realizes close&open operations of door, using the air pressure to drive the screw shaft to lift and drop through the piston movement.

The upper part has three components:

Support:it funcions as 1.the connector between the upper screw mechanism and lower cylinder;2.guiding to the screw shaft working with the spline;3.the bracket of the outer sleeve;4.the primary bearing of the total door weight(thus should be strong enough).

Screw shaft(drive shaft):the priciple part to convert up&down movement to rotating action.

Sleeve asm:rotates along the screw grooves on the screw shaft, driving the arms to swing together.

The upper of the screw shaft is a triangular screw groove(stroke **0mm); the lower is a hex outer spline, working with the inner hex spline in the support, that limits the screw shaft to move under the action of the piston. The inner screw that matches the outer screw of the screw shaft is a floating part, like a nut on a bolt but not fixed in position(rotates under the the up&down movement of screw shaft).

 

Certifications: ISO***1,ISO/TS****9,ISO****1