Centrifugal fault repair two cases (2)

Failure GL21M centrifuge door cover can not open GL21M high-speed refrigerated centrifuge produced by Hunan Kaida Science Instrument Co., Ltd., the maximum speed of the centrifuge is 21,000 rev / min. Due to the extremely high speed of the centrifuge during operation, for safety reasons, the centrifuge is equipped with a protective device, that is, the cover can be closed to work, and the cover can be opened after shutdown. However, after one use, the lid cannot be opened and the sample cannot be removed!

After consulting the information, the protective device of the aircraft is a manual mechanical lock. Its structure is similar to ordinary door locks. Pulling the handle in the lower right corner of the cover can pull the latch out of the lock hole, and the air spring stays. The cover can be opened by the lever. Since the handle and the latch are connected by an "L" type iron piece, that is, one end of the "L" type iron piece is connected to the handle, and the other end is connected to the lock bolt. Both ends of the connection piece are screwed The reason that the door cover cannot be opened is that the fixed screw slips or loosens, eventually causing the connection to disengage, and the latch cannot be pulled out of the lock hole, so that the door cover cannot be opened.

When this failure is encountered, the lower half of the front panel of the centrifuge can be disassembled (the front panel consists of two upper and lower pieces) with the power of the centrifuge cut off, and then the approximate position of the door lock can be probed into the left hand and hand-held. Pulling the “L” iron piece backwards, if it cannot open the door cover, it means that the connection of the “L” iron piece to the latch end has slipped. At this time, a screw with a diameter of 6 mm and a length of about 5 cm can be used, clockwise. Slowly twist it into the rear end of the person's latch and after a few turns, pull back the screw to pull the latch out of the lock hole and open the door cover. After opening, remove the door lock assembly, replace the screw of the sliding teeth, reconnect the two ends of the “L” iron piece, and apply a little grease on the latch and lock hole to reset the door lock assembly. Can repair

NSK Bearing

NSK manufacture a full range of deep groove ball bearings. These bearings are the most common type and are used in a wide variety of applications.

Single-Row Deep Groove Ball Bearings
Pressed Steel Cages
Single-row deep groove ball bearings are the most common type of rolling bearings. Their use is very widespread.
In addition to open type bearings, these bearings often have steel shields or rubber seals installed on one or both sides and are prelubricated with grease. Also, snap rings are sometimes used on the periphery. As to cages, pressed steel ones are the most common.
For big deep groove ball bearings, machined brass cages are used.
Machined cages are also used for high speed applications.

Extra Small Ball Bearings and Miniature Ball Bearings
Miniature and instrument ball bearings can be divided into two basic types, deep groove and angular contact. The first (deep groove) can be further divided into the following five classes depending on their design details:

Standard type
Flanged outer ring
Extended inner ring
Expanded type in which one ring has a radial thickness that is larger than normal compared with the bearing width.
Thin section type in which both rings are extra thin in the radial direction. They can also be classified as: open, shielded, or sealed.
Maximum-Type Ball Bearings
Maximum-Type ball Bearings contain a larger number of balls than normal deep groove ball bearings because of filling slots in the inner and outer rings. Because of their filling slots, they are not suitable for applications with high axial loads. types of bearings have boundary dimensions equal to those of single-row deep groove ball bearings of Series 6200 and 6300 respectively. Besides the open type, ZZ type shielded bearings are also available. When using these bearings, it is important for the filling slot in the outer ring to be outside of the loaded zone as much as possible. Their cages are pressed steel.

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