The utility model provides an outside cover is the sleeve after that that refrigeration type is used for equipment of track fastener detection be provided with the support that is used for setting up video acquisition equipment in the inside of the automobile body of railcar, and video acquisition equipment still stretches out the bottom of the automobile body of railcar, at video acquisition equipment the sleeve in still erect temperature relay, temperature relay still have the normally opened contact, the normally opened contact establish ties between the battery that air discharge fan and power supply supply and exhaust were fanned, all to have the section be the flexion of right angle folding rule form on the both sides of lining up the groove, the separation blade install in between the flexion of right angle folding rule form via the bull stick, the separation blade after the both sides of wall have can cohere in the plastic sheet of flexion position. Avoided a large amount of heats appearing producing and forming the dirt influencing the problem of the work of the inside video acquisition equipment of sleeve.