Dumbbell and production process thereof

Abstract

The invention discloses a dumbbell. The dumbbell comprises a steel handle horizontally placed, and two cast iron dumbbell heads arranged at the two ends of the steel handle. The dumbbell is characterized in that the steel handle comprises a handheld part and two connecting parts arranged at the two ends of the handheld part; installing holes are formed in the centers of the cast iron dumbbell heads and arranged to be stepped holes, each installing hole comprises a large hole in the outer side end and a small hole in the inner side end, stepped surfaces are arranged at the joints of the large holes and the small holes, multiple transversely arranged anti-skidding ribs are evenly distributed in the small holes annularly, and turned edges are arranged at the ends of the connecting parts. Theinvention further discloses a production process of the dumbbell. The production process includes the following steps that the steel handle is machined; casting equipment is used for casting the castiron dumbbell heads; a hydraulic machine is used for pressing the connecting parts of the steel handle into the installing holes of the cast iron dumbbell heads; the hydraulic machine is used for turning over dies to stamp the turned edges; a cement casting machine is used for casting the installing holes to be solid. The dumbbell is good in connecting stability and long in service life.

Description

technical field [0001] The invention relates to the technical field of sporting goods, in particular to a dumbbell and a production process thereof. Background technique [0002] Now the whole country is actively advocating fitness for all, regardless of men, women and children, all the people can enhance their strength, flexibility, endurance, coordination, and ability to control various parts of the body, so as to make the people physically strong. As a simple equipment for strengthening muscle strength training, dumbbells are used for muscle strength training and muscle compound action training. Patients with low muscle strength due to motor paralysis, pain, long-term inactivity, etc., can use the weight of the dumbbell to perform active resistance exercises and train muscle strength by holding a dumbbell. It is very convenient to exercise the body with dumbbells, and is convenient for the popularization of fitness for all. [0003] At present, most dumbbell handles and...

AI Technical Summary

Problems solved by technology

[0003] At present, most dumbbell handles and dumbbell heads are connected by threads. When processing dumbbell handles, it is necessary to set an undercut groove on the handle, which reduces the strength of the dumbbell handle and reduces the overall use of the dumbbell. Lifespan; In order to avoid the above problems in the production process of some dumbbells on the market, the handle is connected to the dumbbell head by welding. Most of the dumbbell heads are made of cast iron, while most of the handles are made of steel. It will be easy to fall off during long-term use, and it is very unstable; moreover, under the gravity of the dumbbell head, a force relative to the axial rotation of the handle will be generated, which will accelerate the welding off, and the welding part will be easily damaged, which will affect the service life of the dumbbell

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