Knife Holders

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Knife holders are a fundamental component in cutting machines, composed of three main elements:

01
Support
This is the element that houses the dished knife. It provides a stable base for the knife, allowing it to rotate freely and cut the material precisely.
02
The retaining ring
This ring, also known as a blocking ring or circlip, is used to secure the tapered knife to the holder. It ensures that the knife stays firmly in place during machine operation.
03
The traction spring
This spring exerts a force on the tapered knife, keeping it in contact with the material to be cut. This allows the knife to cut the material evenly and precisely.

Knife holders are a fundamental component in cutting machines, composed of three main elements:

Support
This is the element that houses the dished knife. It provides a stable base for the knife, allowing it to rotate freely and cut the material precisely.
The retaining ring
This ring, also known as a blocking ring or circlip, is used to secure the tapered knife to the holder. It ensures that the knife stays firmly in place during machine operation.
The traction spring
This spring exerts a force on the tapered knife, keeping it in contact with the material to be cut. This allows the knife to cut the material evenly and precisely.

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Knife holders play a crucial role in ensuring that the cutting process is efficient and accurate.

In fact, each component has a specific role in ensuring that the dished knife is able to cut the material effectively.

Choosing the type of knife holder to use may depend on various factors, including the type of machine, the material to be cut and the specific needs of the application.

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Various ways of blocking the knife holders

The locking mode to be used then depends on the specifications of the machine and the minimum cutting width you want to obtain.

Knife holders can have different securing methods:

Self locking
This is also known as self-locking, as the eccentric ring and balls automatically block the blade holders when the motorised shaft starts to move.
Smooth hole securing
The supports are mounted on the upper shaft of the shearer, with or without spacers, and locked axially. This type of fastening is mainly used on expandable shafts.
Screw locking
This type of fastening involves the use of a grub screw with or without a brass pad pressing on the shaft. Attachment and loosening are possible using a spanner.
Multilock securing
This is a grub screw fastener with ring. The grub screw tightens the ring to the shaft, allowing an even distribution of pressure.
Self locking
This is also known as self-locking, as the eccentric ring and balls automatically block the blade holders when the motorised shaft starts to move.
Smooth hole securing
The supports are mounted on the upper shaft of the shearer, with or without spacers, and locked axially. This type of fastening is mainly used on expandable shafts.
Screw locking
This type of fastening involves the use of a grub screw with or without a brass pad pressing on the shaft. Attachment and loosening are possible using a spanner.
Multilock securing
This is a grub screw fastener with ring. The grub screw tightens the ring to the shaft, allowing an even distribution of pressure.

Maintenance by Negri Lame

Free locking knife holders

  • Resumption of the cone where the spring operates.
  • Replacing the spring and/or retaining ring.

Self-locking knife holders

  • Eccentric ring and ball replacement.
  • Resumption of the cone where the spring operates.
  • Replacing the spring and/or retaining ring.

Screw locking knife holders

  • Replacement of locking grub screw.
  • Cone restoration in line with the spring operation.
  • Replacing the spring and/or retaining ring.