Fabrication method of a shift fork cylinder
The fork cylinder is a piston type actuator, which is applicable to the on-off or metering control of valves with 90 ° angle (such as ball valve, butterfly valve, plug valve). Fork type cylinder, usually refers to the pneumatic actuator with the structure of "single cylinder double piston variable torque fork".
The fork cylinder includes the cylinder block and two end covers. Two pistons are installed on the inner wall of the cylinder block in a sliding way. The same piston rod is fixed on one side of the two pistons. The piston pin is fixed on one side of the piston rod. A fork is set between the two pistons. The inner ring fixing sleeve of the shift fork is provided with a transmission shaft, one end of the transmission shaft runs through the inner wall of the cylinder block and extends to the outside of the cylinder block, one side of the shift fork is provided with a chute, the outer wall of the piston pin contacts the inner wall of the chute, and both ends of the cylinder block are provided with circular thread grooves. The fourth sealing ring is fixedly installed on the inner wall of one side of the circular threaded groove. The two ends of the cylinder block are provided with a third sealing ring. One side of the two third sealing rings contacts one side of the two end covers. The two end covers are fixedly installed with threaded rings near one side. The inner wall and outer wall of the threaded ring are respectively connected with the inner wall threads on both sides of the circular threaded groove. One side of the fourth sealing ring contacts the side of the threaded ring. One side of the end cover is provided with an air hole. One side of the end cover is connected with a limit screw. One end of the limit screw runs through one side of the end cover and extends to the inside of the cylinder block. One end of the limit screw matches one side of the piston. One end of the limit screw thread is connected with the sealing nut, and one side of the sealing nut is in conflict with one side of the end cap;
In the utility model, the thread ring is screwed into the round thread groove for fixation, the thread ring will be sealed with the fourth seal ring, pulled and rotated, the l-type clamp will drive the connecting rod to rotate, the l-type clamp will also drive the sliding rod to slide, the sliding rod will stretch the spring, release the l-type clamp, the pull spring will shrink, the pull spring will drive the sliding rod to reset, the sliding rod will drive the l-type clamp and the l-type groove, fixed, compressed air will enter the cylinder from the air hole, and the air pressure will drive the piston to move, The piston drives the piston rod to move, the piston rod drives the fork to rotate, and the fork drives the drive shaft to rotate.
The utility model has simple structure, the thread ring is screwed into the circular thread groove for fixation, the L card is pulled and rotated for fixation, the compressed air is injected into the cylinder from the air hole, and the transmission shaft is driven to rotate, so that the sealing is simple, fast and convenient to use.
