Pneumatic rotary clamping device

[0013] Example 1

[0014] A pneumatic rotary clamping device, comprising a cylinder 1 and a pressing arm 4, the pressing arm 4 is connected with the piston rod 11 of the cylinder 1 by bolts, wherein a rotating structure in the cylinder 1 is also provided, and the rotating structure includes an integrally connected base 23 and the spindle 21, the longitudinal section of the base 23 is in the shape of a boss, the flange on the base 23 is connected with the cylinder 1 by bolts, and a sealing ring 25 is provided between the base 23 and the inner wall of the cylinder 1, and the spindle 21 is axially upward A spiral groove 22 is provided, and the spindle 21 is coaxially slidingly fitted with the piston rod 11 from the side of the piston seal 12 of the cylinder 1, and the piston seal 12 of the cylinder 1 is provided with a guiding structure that cooperates with the spiral groove 22.

[0015] In this embodiment, the guiding structure includes a spring seat 31, a compression spring 32, and a steel ball 33. One end of the compression spring 32 abuts the steel ball 33, and the other end is connected to the spring seat 31, and the spring seat 31 is connected to the piston seal 12 of the cylinder 1. The steel ball 33 can roll during the guiding process, so the wear is slower and the use time is longer.

[0016] The spindle 21 is provided with two spiral grooves 22 evenly distributed along the circumference of the spindle 21. After one spiral groove 22 is worn, the other spiral groove 22 on the spindle 21 can be used, which can increase the service life of the rotating structure.

[0017] The lower end of the mandrel 21 is provided with a straight groove 24 continuous with the spiral groove 22. When clamping the workpiece 5, the pressing arm 4 first rotates to a position aligned with the belt feed, and then the pressing arm 4 moves perpendicular to the direction of the workpiece 5 and clamps the workpiece 5. At the moment of contacting the workpiece 5, there will be no lateral force on the surface of the workpiece 5, so the position of the workpiece 5 will not shift.

[0018] Example 2

[0019] The difference from Embodiment 1 is that the guide structure includes a mounting seat and a guide pin that can be matched with the spiral groove 22. One end of the guide pin is connected to the mounting seat, and the mounting seat is connected to the piston seal 12 of the cylinder 1. The guide pin guiding structure is simpler .

[0020] Specific use process:

[0021] Take Example 1 as an example, such as figure 1 As shown, taking the pressing arm 4 downward to clamp the workpiece 5 as an example for description, the figure shows the state of clamping the workpiece 5. Intake air into the air hole in the lower part of the cylinder 1. At this time, the piston seal 12 of the cylinder 1 moves upward, and the steel ball of the guiding structure in the piston seal 12 first moves upward along the linear groove 24 on the spindle 21. When it moves to the spiral groove 22, The steel ball slides with the spiral groove 22. At this time, the piston seal 12 and the piston rod 11 rotate with the steel ball synchronously along the track of the spiral groove 22. At this time, the pressure arm 4 also rotates synchronously away from the position aligned with the workpiece 5, which can be easily taken out. Workpiece 5. To clamp the work piece 5, prevent the work piece 5 from being clamped on the worktable, and inject air into the upper air hole of the cylinder 1, the piston rod 11 and the piston seal 12 of the cylinder 1 move down, and the steel ball first slides along the spiral groove 22. At this time, the piston seal 12 and piston rod 11 of the cylinder 1 rotate, and at the same time the pressing arm 4 also rotates to align with the workpiece 5 to be clamped. At this time, the steel ball slides to the linear groove 24, and then the pressing arm 4 is vertical. Move down to clamp the workpiece 5.