Table tennis ball serving machine impact device

Abstract

The invention discloses a table tennis ball serving machine impact device which comprises an electrical control portion and an impact device. The impact device comprises a yoke, a serving guide pipe, a rear end cap and an electromagnetic coil, wherein the serving guide pipe and the rear end cap are fixedly arranged at two ends of the yoke, and the electromagnetic coil is fixedly arranged in the yoke. An impact armature is arranged in a containing cavity enclosed by the serving guide pipe, the rear end cap and the electromagnetic coil, a permanent magnet is fixedly arranged on the rear end cap, an impact head component is fixedly arranged on the impact armature, the electromagnetic coil is provided with at least two windings with the same direction but different electromagnetic driving forces, and the highest magnetic field intensity of the permanent magnet is equal to the highest magnetic field intensity which can be generated by the electromagnetic coil. Impact and return are safe and reliable without return springs, by overlapping the electromagnetic driving forces with permanent magnet assisting force, the output kinetic energy and impulses of the impact armature are greatly improved, and the impact armature is simple in structure and small in relative size. Moreover, the impact armature can output at least three impulses with different strength for table tennis balls, and can effectively simulate the change of actual ball serving strength.

Description

technical field [0001] The invention relates to an impact device for a table tennis transmitter, which belongs to equipment for physical training. Background technique [0002] At present, in sports training venues, table tennis transmitters are generally equipped for players to practice. Existing table tennis sender impact device generally all is to send table tennis at different angles by the rotation of the motor through complex mechanism, its structure is complex, and the cost is high. [0003] In view of the above problems, the Chinese utility model patent CN201668939U discloses an impact device for table tennis electromagnetic transmitters. The shell is provided with an armature cover, the inner cavity of the shell is filled with an electromagnetic coil, the coil is filled with an armature, and the armature push rod is fixedly connected to the armature. , the return spring is set on the armature push rod, and then the electromagnet pole shoe with the center hole is pu...

AI Technical Summary

Problems solved by technology

[0004] However, it has been found in practical applications that the impact device of the above-mentioned table tennis electromagnetic transmitter has the following problems: (1) Since the armature push rod is sleeved with a return spring, the coil is energized to generate a magnetic field to push the armature push rod and the impact head to impact forward , the return force of the return spring is resistance, and since the return force of the spring is proportional to its compressed amount, the force pushing the armature push rod becomes smaller and smaller as the push rod moves forward, resulting in the acceleration of its forward movement (2) Due to the existence of the return spring, there will be friction between the armature push rod and the return spring, so the device will not only cause force loss due to friction, but also the device It is prone to frictional stagnation and cannot be reset, resulting in equipment failure and unable to continue to work; (3) The driving force on the impact armature is only the electromagnetic driving force of the electromagnetic coil, so the acceleration at the initial stage of the impact is small, resulting in an impulse during the impact Relatively small, this will inevitably lead to the need to increase the size of the electromagnetic coil, resulting in a larger volume of the entire device; (4) The impact force of the impact head on the table tennis ball is fixed, which cannot better simulate the change of the actual ball force

[0005] The above defects cause the impact device of the above-mentioned electromagnetic table tennis transmitter to be difficult to popularize and apply

Images