Nozzle head device for injection molding machine

The invention discloses a nozzle head device for an injection molding machine. The nozzle head device comprises a cylindrical nozzle head body, wherein a fluid channel arranged along the length direction of a nozzle head is arranged in the nozzle head body; the caliber of the fluid channel is gradually reduced from one end to the other end; a spray port is formed in one end with smaller caliber; a nozzle head mounting base is sleeved at one end, which is close to the spray port, of the nozzle head body; the nozzle head is arranged on the nozzle head mounting base; a strip temperature detection groove is formed in the outer side wall of the nozzle head body; a nozzle head channel communicated with the fluid channel is arranged in the nozzle head; and the spray port is formed in one end, which is away from the nozzle head body, of the nozzle head channel. The nozzle head device disclosed by the invention comprises the nozzle head body and the nozzle head; when the nozzle head which is subjected to blocking and