Sliding Frame technology was developed and Patented by Saxlund back in the 1960’s as a method of discharging non-free flowing materials from a round flat bottom silo. Since then the Saxlund Sliding Frame has been successfully used extensively around the world in thousands of installations.
The original Saxlund Sliding Frame utilised a Single Frame reciprocating across the bottom of the silo, recently we have patented a new Twin Element Sliding Frame. This design has some advantages for special cases and for larger silo designs
Saxlund Single Element Sliding Frame
Advantages of the Saxlund Sliding Frame –
- Functions with a wide range of non free-flowing bulk solids
- Creates 'mass flow' in a flat bottom silo with these difficult materials
- Frame movement breaks any possible material bridges across entire floor
- Metered material flow from silo on demand in centre or at side
- Two or three separate metered discharge positions possible
- Minimum power required to create 'mass flow' conditions
- Few moving parts give outstanding safe and reliable operation
- Extremely long life from very slow moving Frame(s)
- 'First In, First Out' material flow pattern
- Variable rate of discharge easily achieved from metering screw speed
- Sliding Frame breaks up and delivers loose material to the screw(s)
- Flat bottom silo reduces overall height of installation
Saxlund Twin Element Sliding Frame
How does the Saxlund Sliding Frame Work?
Non-free flowing materials will generally form a bridge across any hole or chute used to discharge the material and require some form of device to “dig” the material out and break any bridges that form.
The Saxlund Sliding frame is driven by powerful hydraulic cylinders that reciprocate the sliding frame(s) across the silo floor. The Saxlund Sliding Frame is designed with a cross-section that when travelling in one direction, slides under the stored material, in the other direction will push the material.
Therefore the Saxlund Sliding Frame is designed to break any bridges when moving in one direction, and slide under the material when moving the opposite direction, thereby promoting bulk material flow. Because of this bulk material flow the Saxlund Sliding Frame is a “First in, First out” technology, which is an added benefit for materials that can degrade over time such a Sewage Sludge Cake.
Material removed by the Saxlund Sliding Frame is then discharged into one or more screw conveyors, the control scheme of the Saxlund Sliding Frame is to ensure that these screws are always kept full of product, to ensure accurate metering.
