Closed-type temperature control device

A closed-type temperature control device, comprising:

• a ceramic box, and
• a base, wherein the base adopts a cavity structure provided with an opening, the base is fixedly connected to the ceramic box, and a guide hole is provided between the base and the ceramic box, wherein a temperature sensing piece is arranged in the base, an action mechanism is arranged in the ceramic box, an action rod connected to the temperature sensing piece and the action mechanism is arranged in the guide hole, and a temperature sensing cover is arranged on an opening of the base,
• wherein the action rod is internally provided with a fine adjustment mechanism capable of finely adjusting the motion of the action rod,
• wherein the fine adjustment mechanism comprises:
• a contact rod, a support plate, a guide rod, a magnetic plate, a first electromagnet and a second electromagnet, wherein the support plate is fixed on an inner wall of the action rod, a lower end of the guide rod is fixed on the magnetic plate, and an upper end of the guide rod passes through the support plate and the second electromagnet and is fixed on an inner wall of the action rod,
• wherein the second electromagnet is arranged above the magnetic plate, and the first electromagnet is arranged below the magnetic plate, wherein a clamping mechanism is arranged between an outer wall of the contact rod and an inner wall of the action rod, and an upper end of the contact rod is capable of extending out from the action rod to abut against the action mechanism.