Swing Clamp Cylinder

Introduction of Swing Clamp Cylinders

Swing clamp cylinders are one of the processing equipment and general assembly fixture equipment. They are designed for stabilizing the workpieces in order to make the next manufacturing steps go smoothly. Swing clamp cylinders can be divided into hydraulic swing clamp cylinders and pneumatic swing clamp cylinders. Moreover, they can come with many forms and various in different sizes.

In common situations, they would be fixed on the working table or platforms on any required position for stabilizing tasks. Before the machining process starts, the swing clamp cylinder would be in a relaxed place. Once the process starts, the lever would spin to the right position, and then descend vertically to clamp on the workpiece. Thus, the workpiece would be fixed stably for the purpose of preventing mistakes and making the finished products reach the high quality.
 

Structure of Swing Clamp Cylinders

Swing clamp cylinders with different designs would have several differences. Basically, they would all have the structure below:

Tightening Bolt
The tightening bolt is used to control the tightness of the lever. If screwing it tight, the lever would be tighter and might have more clamping forces but might influence the smoothness of the lever spin.

​● Wedges
Generally, there would be two wedges on the lever. One for installing the tightening bolt, the other for spacing the tightening bolt and rod.

​● Stopper Pin / Phasing Pin
This little part can be called a stopper pin or phasing pin. When and how many degrees of the angle the lever should spin are controlled by this little part located on the lever.

​● Lever
This is the clamp part of the swing clamp cylinder which is responsible for grabbing the workpieces during the machining progression. 

The lever is passive so that it needs to be driven by other parts of the device. For example, the angle and spin timing of the lever would be controlled by the phasing pin, and the strength of the clamping force would be decided according to the tightness of the tightening bolt.

​● Rod
This is the supporting part which consists of the whole swing clamping cylinders. The lever would spin along the rod. The inner design would be different according to different forms of swing clamp cylinders.

If the swing clamp cylinders come with hydraulic designs, besides the parts listed above, they would also have channels for the oil to pass installed inside the rod. They would be designed as two for each swing clamping cylinder, one for clamping, and the other for unclamping.

When the oil supply comes from the upper direction, the oil would push the rod to spin and descend the lever down to clamp the workpiece. On the contrary, while the oil supply comes from below, the rod would be pushed up and unclamp the workpiece.

The swing clamp cylinders in pneumatic design also have similar structure, but their channels, or called inlet bores, are designed for air flow to pass. Unlike the hydraulic designs which use hydraulic fluid pressure to drive the whole clamp, pneumatic swing clamp cylinders work under the concept of air pressure.

The lever would work to clamp the workpiece once the air flow pass through the upper inlet bore. This would press the rod down and then drive the lever spin to the right position and descend to clamp the workpiece.

When the machining progression is done, the clamp would leave the workpiece by the method of passing the air through the lower inlet bore to create the air flow pressure to push the rod up and then drive the lever going up.
 

Types of Swing Clamp Cylinders

By the different driving methods, swing clamp cylinders can be divided into two types with hydraulic designs which use hydraulic fluid pressure as the driven power, and pneumatic designs which are driven by air flows.

Below are the two types:

​● Hydraulic Swing Clamp Cylinder
Hydraulic swing clamp cylinders designed in this kind can be mounted on any required positions. The motion of the clamp would be controlled by the hydraulic fluid pressure.

Before the machining progression starts, the hydraulic swing clamp cylinder would be in a relaxed place. Once the progression starts, the lever would spin to the right position.

Then, the oil supply from above would make the clamp descend vertically in order to help clamping the workpiece tightly.

On the other hand, the oil supply from below would push the clamp up and unclamp the workpiece after the machining progression is done.

​● Pneumatic Swing Clamp Cylinder
Same as the hydraulic swing clamp cylinders, the pneumatic swing clamp cylinders can also be mounted on any required positions. The biggest difference from the hydraulic ones and pneumatic ones is that the pneumatic swing clamp cylinders are driven by air flow.

Before the machining progression starts, the pneumatic swing clamp cylinder would be in a relaxed place. The air outlet bore is closed.

Once the progression starts, the lever would spin to the right position.

The clamps would be descended by air flow air inlet bore. At the same time, the air outlet bore would be opened to let the air flow push the clamps.

The air flow would be cut off once the clamps are descended to the clamped position while the air valve would be descended along with the clamp. Thus, the workpiece would be clamped tightly and be stable during the machining progression.

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