An introduction to the manufacturing method of a lever-type power chuck

The power chuck is a key component of the machine tool. It is used to clamp the workpiece and drive the workpiece to rotate at high speed to achieve the purpose of surface processing. Existing power chucks are all powered by pneumatics to drive the jaws to clamp or loosen the workpiece. The power chuck structure includes a chuck housing, bottom covers and movable jaw bottom covers respectively located at both ends of the chuck housing, jaws installed on the movable jaw bottom cover, a cylinder bottom cover and a piston in the chuck housing. The piston divides the space between the bottom covers into one and two cylinders, which are connected to the first and second air inlet pipes respectively. During operation, the jaws can be opened or clamped by controlling the air inlets of the first and second air inlet pipes. The clamping force of the jaws is directly related to the air pressure. Although the clamping force of the jaws can be increased by changing the inclination angle of the piston wedge, this can only be achieved by increasing the stroke of the piston. Due to the limitation of the internal space of the chuck, the air pressure of the air inlet pipe can only be increased and a more powerful air compressor can be used, resulting in an increase in the overall sealing level and cost.

In order to overcome the shortcomings in the existing technology, technicians designed a lever-type power chuck, adding a lever between the piston and the bottom cover of the movable claw to increase the clamping force. The technical solution is implemented as follows: a lever-type power chuck, including a chuck housing, a bottom cover and a movable jaw bottom cover respectively located at both ends of the chuck housing, a jaw installed on the movable jaw bottom cover, a cylinder bottom cover and a piston in the chuck housing, where the piston connects the bottom cover between the bottom cover and the cylinder bottom cover. The space is divided into one cylinder and two cylinders, which are connected to the first and second air inlet pipes respectively. The lever is located behind the chuck housing corresponding to the movable jaw bottom cover through a pin. The short arm end of the lever is dynamically inserted into the reserved hole behind the movable jaw bottom cover, and the long arm end of the lever is dynamically inserted into the annular groove of the piston tube. The piston drives the synchronous piston tube to move left and right, driving the lever to swing. The short arm end of the lever drives the bottom cover of the movable jaws to open or clamp the jaws, and the lever achieves the purpose of power assist and reversal. The lever has a crank structure, and the short arm end and the long arm end are perpendicular to each other, which can ensure the sensitivity and reversal function of the two-way swing of the lever. The chuck housing has two air inlets, which are connected to the first air inlet pipe and the second air inlet pipe respectively through the air pipe connecting seat. The air pipe connecting seat is dynamically pivotally connected to the chuck housing; one air inlet on the chuck housing is directly connected to the second cylinder, and the other air inlet is connected to the first cylinder through the bottom cover air channel. A dust-proof tube is pivotally connected to the hollow part of the piston tube. One end of the dust-proof tube abuts the inner end surface of the chuck housing, and the other end of the dust-proof tube abuts the dust-proof cover. The dust-proof cover is fixed on the bottom cover through screw locking. The piston tube and the piston are positioned into a synchronized body through fixed pins. An air channel is provided on the central axis of the piston tube, and the second air inlet pipe is connected to the second cylinder through the air channel; the bottom cover is provided with an air inlet, and the first air inlet pipe is connected to the first cylinder through the air inlet; the first air inlet pipe and the second air inlet pipe are connected to the rotating air guide head. The piston is locked on the piston tube through a nut to form a synchronized body.

The above-mentioned lever-type power chuck has the characteristics of reasonable design and compact structure, and achieves the purpose of increasing force through the driving of the lever transition piston. Under the same power, it has a larger clamping force and can be used as a new power chuck in conjunction with machine tools. It can also be used to transform the power chuck of existing machine tools, thereby improving the processing performance of the machine tool and expanding the processing surface without increasing the input of pneumatic equipment.