CN212112972U - Table tennis side spin trajectory demonstration instrument - Google Patents

Abstract

The utility model relates to a sports apparatus, in particular to a table tennis sidespin orbit demonstration instrument used during table tennis technical theory teaching. The main structure of the demonstration instrument consists of a bottom plate, a bedplate, a left transverse rod, a front longitudinal rod, a middle ball, a vertical rod, a rear longitudinal rod, a right transverse rod, a rotary arrow head, a ball body, an arrow head, a left arc rod, a right arc rod, a bottom support, a left rotary ball, a right elastic rod, a right rotary ball and a left elastic rod; the front cross rod, the rear cross rod, the front longitudinal rod, the rear longitudinal rod and the vertical rod of the demonstration instrument can demonstrate coordinate axes of the table tennis flying along three directions. The vertical rod is provided with a ball body which can demonstrate the side spin of the ball body rotating along the upper and lower axes, the left arc rod and the right arc rod can respectively demonstrate the flight trajectories of the left spin ball and the right spin ball, and the left elastic rod and the right elastic rod can demonstrate the rebound trajectories of the left spin ball and the right spin ball after landing; the instrument is adopted to assist the teaching of the table tennis theory, so that the athlete can visually see different flight and rebound laws of the rotary ball on the left side and the right side.

Description

Table tennis side spin trajectory demonstration instrument

Technical Field

The utility model relates to a sports apparatus, in particular to a table tennis sidespin orbit demonstration instrument used during table tennis technical theory teaching.

Background

The main play of modern table tennis is by means of the rotation of the ball. In the rotation of the table tennis, the motion and rebound tracks of the side spin ball are changed along with the different rotation directions of the ball body, so that the table tennis is wonderful and endless, and the rotation change can be better utilized to disturb the other side only by knowing the reason of the rotation of the side spin ball and the change rule of the motion and rebound tracks, thereby gaining the initiative. The theoretical explanation of the table tennis technical theory on the rotation and the lateral rotation of the table tennis is as follows: the table tennis ball is an object without a fixed shaft, but under the action of external force, a rotating shaft is necessarily generated when the table tennis ball rotates. Since the table tennis ball can rotate in any direction during flying, the number of the rotating shafts of the table tennis ball is infinite. To illustrate the general rules of table tennis rotation, three basic axes of rotation are typically analyzed. The basic rotating shaft of the table tennis ball comprises a left shaft, a right shaft, an upper shaft, a lower shaft and a front shaft and a rear shaft. Upper and lower shafts: it is a side-rotating ball which is rotated around the axis of the ball center which is perpendicular to the table surface. Taking a player as a reference, the ball rotates leftwards to be a left-side spin, and the ball rotates rightwards to be a right-side spin. When hitting a ball, if the ball has different spin characteristics, the arc shapes will be different, i.e. the left-hand spin and the right-hand spin will produce different arcs when flying. At present, during the theoretical study of the table tennis technique, a graphical scheme is usually adopted to be matched with the lateral spin technique for explanation. Because no instrument specially used for demonstrating the flight path of the side spin ball is available, teachers feel difficult to explain and students feel difficult to understand when studying the part of the content. Therefore, the learning effect is not good enough.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides a table tennis side spin trajectory demonstration instrument which can demonstrate the flying rules of the left spin ball and the right spin ball.

The utility model adopts the technical proposal that: a table tennis lateral rotation trajectory demonstration instrument comprises a main body structure of a bottom plate, a table plate, a left cross rod, a front longitudinal rod, a middle ball, a vertical rod, a rear longitudinal rod, a right cross rod, a rotating arrow, a ball body, an arrow, a left arc rod, a right arc rod, a bottom support, a left rotating ball, a right bouncing rod, a right rotating ball and a left bouncing rod; the upper end of a bottom plate of the demonstration instrument is fixedly connected with the lower end of a bedplate, the middle ball and the ball body are respectively provided with a middle hole, the upper end of the bedplate is fixedly connected with the lower end of a vertical rod, the upper end of the vertical rod respectively penetrates through the middle holes of the middle ball and the ball body and is fixedly connected with the middle ball and the ball body, jacks are respectively arranged in the front, the rear, the left and the right of the middle ball, the jack at the left end of the middle ball is connected with one end of a left cross rod in an inserting way, the jack at the right end of the middle ball is connected with one end of a right cross rod in an inserting way, the jack at the front end of the middle; the side face of the sphere is fixedly connected with one ends of the left arc rod and the right arc rod, the other ends of the left arc rod and the right arc rod are respectively and fixedly connected with the side faces of the two bottom supports, the lower ends of the two bottom supports are respectively and fixedly connected with the upper end of the bedplate, the upper ends of the two bottom supports are respectively and fixedly connected with the lower ends of the left spin ball and the right spin ball, a plurality of jacks are formed in the side face of the bottom support, and the right elastic rod and the left elastic rod are respectively connected with the right bottom support; the sphere, the left rotary ball and the right rotary ball are provided with rotary arrows; arrows indicating directions are arranged on the left transverse rod, the front longitudinal rod, the vertical rod, the left elastic rod and the right elastic rod; the middle part of the bedplate is provided with a small net rack and a small net.

The demonstration instrument is simple in structure and convenient to use. The front cross rod, the rear cross rod, the front longitudinal rod, the rear longitudinal rod and the vertical rod of the demonstration instrument can demonstrate coordinate axes of the table tennis flying along three directions. The vertical rod is provided with a ball body which can demonstrate the side spin of the ball body rotating along the upper and lower axes, the left arc rod and the right arc rod can respectively demonstrate the flight trajectories of the left spin ball and the right spin ball, and the left elastic rod and the right elastic rod can demonstrate the rebound trajectories of the left spin ball and the right spin ball after landing; the instrument is adopted to assist the teaching of the table tennis theory, so that the athlete can visually see different flight and rebound laws of the rotary ball on the left side and the right side. Therefore, the understanding of the player on the side spin technique is deepened, the interest of learning the table tennis technical theory is improved, and the aim of rapidly mastering the table tennis technical theory is fulfilled; the teaching method is more standard, scientific and convincing. The instrument can meet the requirements of the public and professional athletes, and has practical significance for improving the teaching effect of the table tennis technical theory by applying the demonstration instrument.

Drawings

The following describes the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of the present invention.

Detailed Description

The utility model provides a table tennis side spin trajectory demonstration instrument adopts following structure, as shown in figure 1, the upper end of the bottom plate 3 of the instrument is fixedly connected with the lower end of the table plate 4, the middle ball 7 and the ball 12 are both provided with a middle hole, the upper end of the table plate is fixedly connected with the lower end of the vertical rod 8, the upper end of the vertical rod respectively passes through the middle ball and the middle hole of the ball and is fixedly connected with the middle ball and the ball, the middle ball is provided with jacks in the front, the back, the left and the right sides, the middle ball left end jack is connected with one end of the left cross rod 5 through inserting, the middle ball right end jack is connected with one end of the right cross rod 10 through inserting, the middle ball front end jack is connected with one end of the front longitudinal rod 6 through inserting, and the; the side face of the sphere is fixedly connected with one end of a left arc rod 14 and one end of a right arc rod 15, the other ends of the left arc rod and the right arc rod are respectively fixedly connected with the side faces of two bottom supports 16, the lower ends of the two bottom supports are respectively fixedly connected with the upper ends of a left bedplate and a right bedplate, the upper ends of the two bottom supports are respectively fixedly connected with the lower ends of a left rotary ball 17 and a right rotary ball 19, a plurality of jacks are formed in the side faces of the bottom supports, and a right elastic rod 18 and a left elastic rod 20 are respectively connected with the right bottom; the sphere, the left rotary ball and the right rotary ball are respectively provided with a rotary arrow 11, and the rotary arrows are respectively connected with the sphere, the left rotary ball and the right rotary ball through adjustable bolts; the left cross rod, the front longitudinal rod, the vertical rod, the left elastic rod and the right elastic rod are all provided with arrows 13 for indicating directions.

The middle part of the bedplate is provided with a small net rack 1 and a small net 2.

When the instrument is used, the instrument is placed on a platform or a table tennis table, and the right elastic rod and the left elastic rod are respectively inserted into the insertion holes of the two bottom supports according to the rebounding direction rule of the left and right side-spin balls.

The teacher can explain the spin ball flight law in combination with the instrument. Such as: the vertical rod of the instrument demonstrates that the vertical rod passes through an upper and lower shaft of which the center of the sphere is vertical to the table top, and the shaft of the sphere rotates to be a lateral rotation ball. When a player hits a ball, the ball is explained to rotate leftwards to be a left-handed rotating ball by combining the rotating arrow of the ball body of the instrument, and the racket rubs the ball body leftwards to enable the ball body to generate a left-handed rotating ball rotating along the upper and lower axes. Then the direction of the rotating arrow is adjusted to rotate 180 degrees, and then the explanation ball rotates rightwards to be a right rotating ball; combine the right arc pole, the right spring pole and the demonstration of left side spin ball of this instrument, explain the left side spin ball: when the ball flies in the air, the left-side rotation can lead the flying arc line of the ball to deflect rightwards, the ball slightly turns rightwards after hitting the platform, and the ball obviously rebounds leftwards when in flat gear. Combine left arc pole, left elastic rod and the demonstration of right side spin of this instrument, explain the right side spin: the right side rotation can make the ball flying arc line incline leftwards, the table is touched to turn leftwards slightly, and the ball rebounds rightwards obviously when the table is blocked.

Claims (1)

1. The utility model provides a table tennis side spin orbit demonstration appearance which characterized in that: the demonstration instrument main body structure consists of a bottom plate (3), a bedplate (4), a left cross rod (5), a front longitudinal rod (6), a middle ball (7), a vertical rod (8), a rear longitudinal rod (9), a right cross rod (10), a turning arrow head (11), a ball body (12), an arrow head (13), a left arc rod (14), a right arc rod (15), a bottom support (16), a left rotary ball (17), a right elastic rod (18), a right rotary ball (19) and a left elastic rod (20); the upper end of a bottom plate of the demonstration instrument is fixedly connected with the lower end of a bedplate, the middle ball and the ball body are respectively provided with a middle hole, the upper end of the bedplate is fixedly connected with the lower end of a vertical rod, the upper end of the vertical rod respectively penetrates through the middle holes of the middle ball and the ball body and is fixedly connected with the middle ball and the ball body, jacks are respectively arranged in the front, the rear, the left and the right of the middle ball, the jack at the left end of the middle ball is connected with one end of a left cross rod in an inserting way, the jack at the right end of the middle ball is connected with one end of a right cross rod in an inserting way, the jack at the front end of the middle; the side face of the sphere is fixedly connected with one ends of the left arc rod and the right arc rod, the other ends of the left arc rod and the right arc rod are respectively and fixedly connected with the side faces of the two bottom supports, the lower ends of the two bottom supports are respectively and fixedly connected with the upper end of the bedplate, the upper ends of the two bottom supports are respectively and fixedly connected with the lower ends of the left spin ball and the right spin ball, a plurality of jacks are formed in the side face of the bottom support, and the right elastic rod and the left elastic rod are respectively connected with the right bottom support; the sphere, the left rotary ball and the right rotary ball are provided with rotary arrows; and arrows indicating directions are arranged on the left transverse rod, the front longitudinal rod, the vertical rod, the left elastic rod and the right elastic rod.

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