KNIFE HANDLE MATCHED WITH ULTRALOW-TEMPERATURE MEDIUM INTERNAL SPRAYING TYPE MAIN SHAFT

A knife handle matched with an ultralow-temperature medium internal spraying type main shaft, relating to the technical field of computer numerical control machine tools. The knife handle mainly consists of a hollow knife handle main body, a high-performance heat insulation structure, and a bidirectional sealing structure, has the function of guiding an ultralow-temperature medium to flow from the interior of a main shaft into a cooling channel in a knife tool , and realizes the ultralow-temperature heat insulation and dynamic sealing functions. The high-performance heat insulation structure in the knife handle uses a material having low thermal conductivity and a small linear expansion coefficient, so that the low-temperature influence of the ultralow-temperature medium on the knife handle and the main shaft is suppressed, and the size precision and the matching precision of the internal structure of the knife handle are guaranteed. The bidirectional sealing structure in the knife handle uses a sealing ring