Classification of rare earths 1) Light rare earth (also known as 铈 group): 镧 , 铈, 镨 , é’• , é’·, é’ , é“• , é’† . 2) Heavy rare earth (also known as é’‡ group): 铽 , é• , é’¬ , é“’ , é“¥ , 镱 , é•¥ , é’ª , é’‡. The difference between the 铈 group and the é’‡ group is because the rare earth mixture obtained by separation of minerals is often named after the ratio of lanthanum or cerium. Rare earth metals (rare earth metals), also known as a rare earth element, is a general term for a group â…¢B periodic table scandium, yttrium, lanthanides 17 elements, commonly represented by R or RE. Their names and chemical symbols are é’ª (Sc), é’‡ (Y), 镧 (La), 铈 (Ce), 镨 (Pr), é’• (Nd), é’· (Pm), é’ (Sm), é“• (Eu ), Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. Their atomic numbers are 21 (Sc), 39 (Y), 57 (La) to 71 (Lu). é“¥ (Tm) é“¥ element was discovered in 1879 by Cliff of Sweden and named after the old name of Scandinavia, Thule. î´ The main uses of é“¥ are as follows: (1) é“¥ is used as a source of medical portable X-ray machine. After irradiation in a nuclear reactor, an X-ray isotope can be generated, which can be used to manufacture a portable blood irradiator. It is converted into é“¥-170 by the action of a high neutron beam, which emits X-rays to illuminate the blood and lowers white blood cells. It is these white blood cells that cause organ transplant rejection, thereby reducing the early rejection of organs. (2) The strontium element can also be used for clinical diagnosis and treatment of tumors because it has a higher affinity for tumor tissues, and heavy rare earths have greater affinity than light rare earths, especially with the highest affinity of strontium elements. (3) The activator LaOBr:Br (blue) is used as an activator in the phosphor for X-ray intensifying screen to enhance the optical sensitivity, thus reducing the X-ray exposure and harm to humans, and the previous calcium tungstate intensifying screen. This can reduce the X-ray dose by 50%, which has important practical significance in medical applications. (4) é“¥ can also be used as an additive in new lighting source metal halide lamps. (5) Tm 3 + can be added into the glass to form a rare earth glass laser material, which is the solid laser material with the largest output pulse volume and the highest output power. Tm 3 + can also be used as an activating ion for rare earth upconversion laser materials. Metal enamel Antimony ingot Excavator Cylinder Piston Rod Seals
Installation and application of piston rod seal for excavator hydraulic cylinder Excavator hydraulic cylinder piston rod seal, hydraulic cylinder piston seal, sealing kit Safe Seal Technology Co., Ltd. , https://www.jolseals.com
The installation and application of hydraulic cylinder piston rod seals in excavators mainly include the following aspects:
1. Applying lubricating oil: Before installing the seal, the surface of the piston rod must be coated with lubricating oil to facilitate the installation and use of the seal.
2. Install the seal: Install the seal on the piston rod in sequence, taking care not to pinch or bend the seal.
3. Pressing the seal: After installing the seal, special tools need to be used to press the seal tightly to ensure its tightness and stability.
4. Check the sealing effect: After installing the sealing element, it is necessary to check the sealing effect. It can be detected by observing the working status of the hydraulic cylinder or using tools such as leak detectors.
5. Application scenario: The piston rod seal of excavator hydraulic cylinder is mainly used in the hydraulic system of construction machinery such as excavators, loaders, and bulldozers to prevent hydraulic oil leakage and ensure the normal operation of the machine.
In summary, the installation and application of hydraulic cylinder piston rod seals in excavators is a very important part of the hydraulic system, and must be strictly operated in accordance with regulations to ensure the normal operation and safety of the machine.
Use of rare earth element lanthanum (Tm)