Hydraulic shock absorber

The hydraulic shock absorber are widely used in automation equipment, vehicles, various tools, etc.

They can effectively absorb the vibration and noise generated by high-speed movement, convert kinetic energy into heat energy and release it in the atmosphere. The object is stopped smoothly and effectively in one action. This article mainly introduces the hydraulic shock absorbers which are used in automation machinery.
In the past, many manufacturers only used PU glue, springs, etc. as buffers to save costs, but the effect is not satisfied, the noise remains the same, and the efficiency cannot be improved. Choosing the hydraulic shock absorber will effectively solve the disadvantages of poor buffering. In the automated machinery, vibration and noise can be reduced, the object is balanced and effectively stopped; the efficiency of the machine is increased, the life of the machine is extended, and the maintenance cost is reduced.

What’s the Hydraulic Shock Absorbers?

All hydraulic shock absorbers are a kind of device which converting kinetic energy (movement) into thermic energy (heat) and release it in the atmosphere, meanwhile, to ensure the workpiece stop or decelerate to a certain speed with minimum load rebound, minimum shock to the load, and minimum shock to surrounding equipment. For that purpose, fluid in the shock absorber is forced to flow through restricted outlets and valve systems, thus generating hydraulic resistance.
Settled Shock Absorber

1.Out Barrel 2. End Cap 3. Rod Y seal 4. Inner Barrel 5. Piston 6. Piston Rod 7. Head Cap 8. Bearing 9. Spring 10. Impact Cap 11.        Accumulator

The above figure shows the structure of fixed type hydraulic absorber. There is no adjustable mechanism inside. It gets different buffer characteristics through changing the internal outlets size, number, and position. According to the different deceleration rate, it’s divided three categories: High Speed; Medium Speed; Low Speed. According to the outlets area, it can be divided into single overflow, multiple overflow type.

Adjustable Shock Absorber

1. Out Barrel 2. End Cap 3. Rod Y seal 4. Inner Barrel 5. Piston 6. Piston Rod 7. Head Cap 8. Bearing 9. Spring 10. Impact Cap 11. Accumulator 12. Adjustment Bolt 13. Adjustment Knob

Though rotating the adjustable rotary nut to change the internal oil displacement, thus, to regulate the buffer absorption characteristics. Common adjustable range :0-8 scale. The resistance force gradually increases from 0-8 grade. When there is only one outlet left for overflow, it gets maximum adjustable buffer force. When there is no outlets are blocked off, it gets the minimum resistance force.

Adjustable Hydraulic Speed Stabilizer or Hydraulic Speed Damper

It’s another kind of hydraulic shock absorber. Compared with the commons style, it not only functions as a buffer, but also maintain the speed of the workpiece at a relatively stable level after collision until the end of the stroke. Its internal structure is similar to the normal ones and is adjustable. The overflow holes of the common type are gradually disabled when the piston is going forward, so the resistance is getting larger, finally making the workpiece stop smoothly. Instead, the number of outlets in the speed stabilizer are kept constantly within a certain stroke after the collision, so that the workpiece can run for a certain distance at a steady speed, and finally decelerate until it stops.

Hydraulic speed stabilizers are used in many industries. Precision speed stabilizers provide a simpler and cost-reduced option. Among the pneumatic cylinders, it can supply very stable anti-pressure effect, making the pneumatic cylinder relying on the effect of resistance to produce a stable forward speed, in addition, it will not affect the original design of the machine.