▎ 摘　　要

NOVELTY - The protection tube has a cable sleeve (1) whose inner wall is fixedly connected with uniform separation plates (2) fixedly connected with cable (3). The cable sleeve is sleeved with a protective tube (4) excavated with a cavity. The cavity is provided with uniformly distributed air bags filled with cooling liquid. The outer side of cavity is fixedly connected with a graphene layer whose inner wall is fixedly connected with pressing blocks. The fixing plate is located between the pressing blocks whose lower end is provided with a heat insulating plate located at the outer side of cable sleeve. The uniformly distributed rubber bag is set between the heat insulating plate and the fixing plate and between the pressing blocks. The rubber bag is filled with ammonium chloride powder. The inner wall of the fixing plate is fixedly connected with several memory springs (15). The memory spring is fixedly connected with the rubber bag. USE - Downlight type power cable protection tube for transmitting and distributing electric power cable used in city underground power grid, power station lead-out circuit, industrial and mining enterprise internal power supply and river sea underwater transmission line. ADVANTAGE - When the protective tube is impacted, the air bag is extruded. The impact force is primarily released and conducted to the fixing plate. The rubber capsule bag is used for secondary shock absorption so as to reach the heat dissipation and relieve the pressure of the external impact object. The impact between the bottom block and the base can be protected by rubber ring, so as to reduce the abrasion of the base. The service life of the heat insulating plate can be prolonged. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the downlight type power cable protection tube. Cable sleeve (1) Separation plate (2) Cable (3) Protective tube (4) Memory spring (15)