A torsion spring is a type of spring that is commonly used in a variety of mechanical devices to provide elastic support and store energy. The torsion spring's tensile force can be adjusted in a number of ways, the following are some common methods:

1. Changing the spring material: Torsion springs have different spring materials, the tensile force will also be different. Replacing the spring material can change the spring's tensile force to match the equipment's needs.

2. Adjusting the diameter and length of the spring: Increasing the diameter or length of the spring increases the spring's tensile force, while decreasing the diameter or length reduces the tensile force. Tensile force is adjusted by changing the geometry of the spring.

3. Compressing the number of coils of a spring: Increasing the number of coils of a spring increases the spring's tensile force, while decreasing the number of coils decreases the tensile force. Adjust the force by adjusting the number of turns of the spring.

4. Front and rear position of the extension or compression spring: Changing the position of the spring in the device can have an effect on the tensile force. Extending or compressing the spring back and forth can change the force applied to the spring, which in turn can change the spring's extension force.

5. Use of Threaded Adjusters: Some torsion springs can be adjusted for tensile force using threaded adjusters. By rotating the thread adjuster, the force on the torsion spring can be changed, thus adjusting the tensile force.

Overall, adjusting the tensile force of a torsion spring can be accomplished in a variety of ways, including adjusting the material, size, number of turns, and position. When making adjustments, care needs to be taken to maintain the overall structural integrity of the spring to avoid over-adjustment leading to spring failure or deformation. Spring adjustment needs to be carried out under the guidance of professionals to ensure the normal operation and safety of the equipment.