FIELD

The present invention relates to the technical field of fitness equipment, in particular to a power adjustment device.

BACKGROUND

Along with the development of society, people pay more attention to health gradually, various exercise modes emerge endlessly, fitness equipment is widely used as a common exercise tool, and in the existing fitness equipment, a method for exercising by pulling balancing weights with different weights through a steel cable is commonly adopted. This method has the following defects: 1, large vibration and noise exist when a balancing weight falls, 2, no isolation exists around the balancing weight when the balancing weight falls, resulting in potential safety hazards, 3, the balancing weight is large in mass and inconvenient to assemble, and 4, the cost is high due to use of the balancing weight.

SUMMARY

In order to solve at least one technical problem mentioned above in the prior art, the present invention provides a power adjustment device to achieve purposes of eliminating vibration, lowering noise, eliminating potential safety hazards, being more convenient in assembly and lowering cost.

The technical solution used by the present invention is as follows: a power adjustment device is provided and includes a steel cylinder and a dustproof cover fixed at an upper end of the steel cylinder, a piston being slidably arranged in the steel cylinder, the piston being fixedly provided with a guide rod that is slidably connected to the dustproof cover, and a steel cable being fixed at an upper end of the guide rod.

The piston is provided with at least one one-way air guide structure, the one-way air guide structure including an air guiding channel, wherein the air guiding channel includes a circular upper channel and a lower channel with a diameter smaller than that of the upper channel, an adjustment ball with a diameter larger than that of the lower channel and smaller than that of the upper channel being arranged inside the upper channel.

An upper end of the steel cylinder is at least provided with one vent hole, so that tension needed when the piston ascends falls within a range capable of being borne by people, and effects of exhausting air and conveniently returning the piston when the piston descends are achieved favorably. A bottom surface of the piston is provided with an upper silencing pad, and a bottom plate is arranged at a lower end of the steel cylinder, a lower silencing pad being arranged on the bottom plate, so that hard collision is avoided, a buffering effect is achieved, the service life is prolonged, and noise is reduced. A position, corresponding to the lower channel, of the upper silencing pad is provided with an upper silencing pad through hole, and a lower silencing pad is provided with a rectangular through hole.

An opening end of a first circular blind hole is provided with a step, and the step is provided with a closed ring, so that axial disengagement of an air volume adjusting shaft is prevented favorably.

The bottom plate is provided with a rectangular air volume adjusting mechanism or a circular air volume adjusting mechanism, wherein the rectangular air volume adjusting mechanism includes a rectangular air valve and a first rectangular blind hole that are arranged on the bottom plate and communicate with each other, an air volume adjusting sheet being slidably arranged inside the first rectangular blind hole, and the ventilation volume of the rectangular air valve is controlled by pulling the air volume adjusting sheet in a sliding mode, so that force required when the piston ascends is changed, and an effect of replacing different balancing weights is achieved.

The circular air volume adjusting mechanism is arranged on the bottom plate and includes a first circular blind hole and a first through hole that are provided in the bottom plate and perpendicular to each other, and communicate with each other, an air volume adjusting shaft being rotatably arranged inside the first circular blind hole, a second circular blind hole being provided in the air volume adjusting shaft in an axial direction, and a large air volume adjusting hole and a small air volume adjusting hole being provided in the air volume adjusting shaft in a circumferential direction, and the large air volume adjusting hole or small air volume adjusting hole is made to be opposite the first through hole by rotating the air volume adjusting shaft to adjust the ventilation volume, so that force needed when the piston ascends is changed, and an effect of replacing different balancing weights is achieved.

The present invention provides two air volume adjusting mechanisms, namely the rectangular air volume adjusting mechanism and the circular air volume adjusting mechanism so as to achieve a purpose of replacing the balancing weight with the device of the present application; movement of the piston inside the steel cylinder is obviously safer than movement of a traditional exposed balancing weight; and compared with existing sports equipment, the device of the present invention is lighter in weight, simpler in structure, and lower in manufacturing cost.

