Bolt clamping force transducer for bolt tightening operation

A bolt clamping force transducer for a bolt tightening operation, comprising:

• a transducer body having an end being a torque tool's engaging portion to match a force-generating end of the torque tool in dimensions and having another end having a threaded hole with a helical guiding groove, wherein a bottom of the threaded hole receives a force sensing module and meshes with a helical guiding groove of a torque rotating shaft;
• the force sensing module comprising a sensing ring body and a force sensing component, wherein an annular recess is disposed at an edge of the sensing ring body, whereas the force sensing component is adhered to a bottom of the annular recess to sense a strain value of the sensing ring body axial and electrically connected to a signal processing module;
• a dustproof plug disposed between the force sensing module and the torque rotating shaft and having a seal ring for preventing intrusion of foreign bodies into the force sensing module;
• the torque rotating shaft, wherein a plurality of helical guiding grooves are disposed at an end of the torque rotating shaft and correspond in position to the helical guiding groove in the threaded hole of the transducer body, wherein a driving head is disposed at another end of the torque rotating shaft and matches a force-applying end of a socket in dimensions to tighten a bolted joint of a specific specification;
• a plurality of steel balls disposed between the helical guiding groove of the transducer body and the helical guiding groove of the torque rotating shaft to lower rotational friction;
• a signal processing module disposed inside or outside the transducer body and having a signal amplifier, microprocessor, power circuit unit, signal transmission unit, input/output module, gyroscope, memory unit, transmission antenna and alert unit, the signal amplifier amplifying a sensed strain signal sent from the force sensing module to the signal processing module via a cable, allowing the amplified sensed strain signal to be computed by the microprocessor according to a pre-calibration parameter to obtain a clamping force value, the power circuit unit converting external power to power required by a power module, the signal transmission unit being wireless RF, Bluetooth, WiFi or ZigBee or being wired RS232, RS485 or UART to transmit signals to a control device or display device, the input/output module being a USB conducive to battery recharging and firmware update;
• the gyroscope detecting rotational angular displacement of the bolt clamping force transducer, the memory unit storing a parameter relation obtained by calibrating the bolted joint to be fastened in place and the strain value of the force sensing module with a standard axial force gauge, the alert unit being a buzzer or LED indicator indicative of signal strength, power state or usage state;
• the power module being a rechargeable battery and being electrically connected to the signal processing module;
• a holder fixed to the transducer body, wherein a protecting member encloses the signal processing module and the power module;
• the protecting member made of a material not blocking wireless signal transmission and adapted to protect the signal processing module and the power module;
• a cable electrically connected to the signal processing module and the force sensing component of the force sensing module;
• and
• a retaining ring for supporting the torque rotating shaft to allow the torque rotating shaft to slide within the threaded hole of the transducer body without detachment.