According to the different precision requirements of turning machining, there are two types of live tip and fixed tip in use; according to different positioning reference sizes, there are two different structures of tip and cone plug, which are used for positioning the inner hole of the top hole and the sleeve respectively. When drilling a hole, the tip of the tailstock needs to be replaced with a drill chuck.

There are many types of machine tool accessories available for turning machining, but for multi-variety, small batch, high-precision, high-efficiency CNC machining environment, the more types of fixtures, the more inconvenient to use and maintain, the higher the overall management cost, CNC The more characteristic the processing is, the more unfavorable it is.

Through the comprehensive improvement of machine tool accessories (different top types), a multi-function tip that can be used both as a top end and as a drill chuck has been developed. It not only meets the needs of rapid clamping of CNC turning and finishing, but also meets different requirements for bit clamping. It makes the machine tool accessories more general, serialized and standardized, reflecting the high quality, fast and low cost requirements of mechanical manufacturing.

1. Function and principle

The multi-function top adopts the modular split structure (as shown in the figure). In addition to the functions of fixed top, live top and cone plug, it also has the function of drill chuck, and tooling can be realized on the machine tool. Quick change operation of the fixture.

The versatile top is in the machine tool attachment - On the basis of the rotary top, the top head structure is changed to the claw module structure, and the clamping and switching of the tip or the drill bit is smoothly performed by the standardization and the operation convenience of the claws.

When machining rotary parts, it is only necessary to replace the top heads or cone plugs of different specifications according to the structure of the workpiece, and to realize the positioning of the different sizes of holes of the shaft or sleeve parts. . When the high-speed cutting is performed, the set screws can be loosened to realize the function of the live top. If the position accuracy is high, the set screws are tightened, and the whole structure is integrated to realize the fixed top function. When drilling the center hole or drilling, the illustrated tip can be replaced with the required center drill, twist drill, etc. to realize the function of the drill chuck.

2. Application characteristics

The multi-function top structure integrates the functions of the live top function, the fixed top function and the drill chuck. It has the high positioning accuracy and convenient operation accuracy of the special tooling fixture, and the standardized unified interface of the machine tool attachment, fast and accurate setting, etc. The feature also solves the problem that the adjustment range of the general drill chuck clamping is small. This versatile top structure is suitable for CNC machining environments and is worthy of promotion.

Centrifuge Tube Rack

At present, in the process of isolation and preparation of various stem cells from various tissue sources, Centrifuge Tubes with a volume of 15ml and 50ml are used.
It is one of the low-value consumables with high usage rate. It is generally installed on a dry foam rack with the package or in bulk. When used, it is taken out by the operator and placed on the plastic centrifuge tube rack in the ultra-clean workbench. The common centrifuge tube rack can only make the centrifuge tube stand upright. When transferring liquid or needing centrifugation, the operator should hold the centrifuge tube in the left and the night gun or aspirator in the right. If it is necessary to transfer a large amount of liquid reagents or perform gradient centrifugation operations, such as density gradient centrifugation to separate mononuclear cells, the operator needs to hold the centrifuge tube with the right hand for a long time and tilt the centrifuge tube, which often causes the operator's wrist joint pain. At the same time, it will also affect the liquid superposition effect, which will easily lead to the mixing of liquids of different densities, resulting in the failure of the experiment.

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