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A strength training control device comprises: a torque source (including a base frame, a motor and a gear reduction box); and a link mechanism (including a gearbox arm, a first link rod, a second link rod, and an operating rod arm), wherein a S-type load cell is coupled to the first link rod and the

A strength training control device comprises: a torque source (including a base frame, a motor and a gear reduction box); and a link mechanism (including a gearbox arm, a first link rod, a second link rod, and an operating rod arm), wherein a S-type load cell is coupled to the first link rod and the second link rod to sense a load value. The control device further comprises: an operating rod, an electronic meter for setting a torque value, and a servo controller for comparing a load value of S-type load cell with a set value of the electronic meter. After the difference value is adjusted, an electric current is outputted to drive the motor, and the motor torque is amplified by the gear reduction box and transmitted through the link mechanism to the operating rod, and users can obtain a torque value equal to the setting of the electronic meter.

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1. A strength training control device using a motor assembled S-type load cell, comprising: a) a base frame;b) a torque source, fixed onto the base frame, and comprising a motor and a gear reduction box, wherein the motor is a brushless motor or a DC motor, and an end of the gear reduction box is co

1. A strength training control device using a motor assembled S-type load cell, comprising: a) a base frame;b) a torque source, fixed onto the base frame, and comprising a motor and a gear reduction box, wherein the motor is a brushless motor or a DC motor, and an end of the gear reduction box is coupled to the motor, and another end of the gear reduction box includes a main shaft;c) an operating rod, with the bottom pivotally coupled to the base frame;d) a link mechanism, having an output end coupled to the main shaft of the gear reduction box and an input end coupled to the operating rod, and the link mechanism having: i) a gearbox arm, with an end sheathed on the main shaft, and another end coupled to a first link rod;ii) an operating rod arm, with an end sheathed on the operating rod, and another end coupled to a second link rod; andiii) an S-type load cell, with both left and right sides coupled to the first link rod and the second link rod respectively;e) an electronic meter, fixed onto the base frame, and provided for a user to set a required torque value; andf) a servo controller, for comparing the difference between a sensed value of the S-type load cell and the set value of the electronic meter and after the difference value is adjusted, an electric current is output to drive the motor; whereby, after the motor torque is increased by the gear reduction box and then transmitted through the gearbox arm, the first link rod, the S-type load cell, the second link rod and the operating rod arm to the operating rod, the user obtains a torque value equal to the set value of the electronic meter. 2. The strength training control device using a motor assembled S-type load cell as recited in claim 1, wherein the servo controller comprises: a DC power supply, a load signal amplifier, a differential amplifier, a proportional-integral-derivative (PID) controller, and a DSP driver, and the sensed value of the S-type load cell is fed back to the load signal amplifier, and the signal is amplified and then transmitted to the differential amplifier, and the set value of the electronic meter is transmitted to the differential amplifier, and then after the differential amplifier compares the difference between the load value and the set value, the difference value is adjusted by the PID controller to drive the DSP driver to output an electric current to drive the motor. 3. The strength training control device using a motor assembled S-type load cell as recited in claim 2, wherein the S-type load cell has a screw hole separately formed on both left and right sides of the S-type load cell, a screw thread is respectively formed at ends of the first link rod and the second link rod and corresponding to the respective screw hole, and a spring washer is respectively installed between the first link rod and the S-type load cell and between the second link rod and the S-type load cell for a better fit of the screw thread and the screw hole. 4. The strength training control device using a motor assembled S-type load cell as recited in claim 1, wherein the gearbox arm and the main shaft are sheathed and coupled with each other by a connecting sleeve. 5. The strength training control device using a motor assembled S-type load cell as recited in claim 1, wherein the operating rod is divided into left and right rods, an end of each of the left and right rods being tightly sheathed with a respective flanged base, and the operating rod arm is installed between the two flanged bases and securely fixed by a plurality of bolt-and-nut sets, such that the operating rod arm swings reciprocally together with the operating rod. 6. The strength training control device using a motor assembled S-type load cell as recited in claim 1, wherein the gearbox arm and the first link rod are coupled by two first cams and securely fixed by a plurality of bolt-and-nut sets. 7. The strength training control device using a motor assembled S-type load cell as recited in claim 1, wherein the operating rod arm and the second link rod are coupled by two second cams and securely fixed by a plurality of bolt-and nut sets. 8. The strength training control device using a motor assembled S-type load cell as recited in claim 1, further comprising a rod holder for pivotally coupling the operating rod to the base frame.