WO2018176573A1 - 发球装置 - Google Patents

发球装置 Download PDF

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Publication number
WO2018176573A1
WO2018176573A1 PCT/CN2017/083100 CN2017083100W WO2018176573A1 WO 2018176573 A1 WO2018176573 A1 WO 2018176573A1 CN 2017083100 W CN2017083100 W CN 2017083100W WO 2018176573 A1 WO2018176573 A1 WO 2018176573A1
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WO
WIPO (PCT)
Prior art keywords
ball
duct
limiting
friction
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/083100
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English (en)
French (fr)
Inventor
王振旭
陈逸奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SZ DJI Technology Co Ltd
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SZ DJI Technology Co Ltd
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Filing date
Publication date
Application filed by SZ DJI Technology Co Ltd filed Critical SZ DJI Technology Co Ltd
Priority to CN201780053461.7A priority Critical patent/CN109641147A/zh
Publication of WO2018176573A1 publication Critical patent/WO2018176573A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/40—Stationarily-arranged devices for projecting balls or other bodies

Definitions

  • the present invention relates to a sphere launching technique, and more particularly to a ball launching apparatus.
  • the radial dimension of the teeing machine's teeing pipe is generally larger than the ball.
  • the ball may enter the teeing duct from a random position in the inlet, and the ball has a random initial position, so the trajectory of the ball is also random, resulting in a ball that is not accurate.
  • Embodiments of the present invention provide a ball delivery device.
  • the tee pipe is formed with an inlet port
  • the limiting member is disposed on the inner wall of the service conduit near the inlet, the limiting member is formed with at least two limiting points, the at least two limiting points and the inner wall A circular limit inlet is formed, the diameter of the circular limit inlet matching the diameter of the ball to allow the ball to enter the inlet port from the circular limit inlet.
  • the limit member includes a contact member and an elastic member connecting the inner wall and the contact member, and the at least two limit points are formed on the contact member.
  • the teeing duct is provided with a guide hole on the inner wall.
  • the limiting member includes a contact member disposed in the guiding hole and an elastic member connecting the bottom of the guiding hole and the contact member,
  • the at least two limiting points are formed on the contact, the contact protruding out of the inner wall to expose the at least two limiting points outside the inner wall, and the contact is used in the The ball compresses the elastic member at the at least two limit points and retracts into the guide hole along the guide of the guide hole.
  • the guide holes extend in a radial direction of the tee duct.
  • the number of the limiting members is one, and the at least two limiting points are formed on the same one of the limiting members.
  • the number of the limiting members is at least two, and each of the limiting members is formed with at least one of the limiting points.
  • the teeing duct includes a friction duct that forms the inlet port
  • the ball delivery device further includes at least one friction wheel disposed on a side of the friction duct and worn A side wall of the friction duct is provided to apply a frictional force to the ball passing through the friction duct.
  • the friction tube includes a constricted section, the friction wheel being disposed on a side of the constricted section, the minimum diameter of the constricted section corresponding to a diameter of the sphere.
  • the tee duct further includes a ball duct extending from an outlet of the friction duct in an axial direction of the friction duct, the ball being ejected from the shot duct.
  • the diameter of the ball duct is greater than the diameter of the inlet port to reduce the probability of collision of the ball into the inner wall of the ball duct when the ball is ejected.
  • the central axis of the ball duct coincides with the central axis of the friction duct.
  • the ball serving device of the embodiment of the present invention limits the randomness of the initial position of the ball by setting the limiting member at the entrance, thereby reducing the randomness of the initial position of the ball, thereby facilitating accurate transmission of the trajectory of the emitted ball.
  • FIG. 1 is a perspective view of a ball delivery device according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view of a ball delivery device according to an embodiment of the present invention.
  • FIG. 3 is another schematic cross-sectional view of a ball delivery device according to an embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view of a ball delivery device according to another embodiment of the present invention.
  • FIG. 5 is a schematic cross-sectional view of a ball delivery device according to still another embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view of a ball delivery device according to still another embodiment of the present invention.
  • Serving device 10 teeing duct 12, inlet nozzle 122, inner wall 124, 1284, pilot hole 1242, friction duct 126, constricted section 1262, side wall 1266, ball duct 128, central axis 1264, 1282, circular limit inlet 129 , the limiting member 14, the limiting point 141, the contact member 142, the elastic member 144, the friction wheel 16, and the ball 20.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality” is two or more unless specifically and specifically defined otherwise.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be mechanically connected, may be electrically connected or may communicate with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship.
  • Connected, or integrally connected may be mechanically connected, may be electrically connected or may communicate with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them.
  • the first feature "above”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.
  • a ball delivery device 10 can be applied to, but not limited to, a ball 20 that emits table tennis, tennis, soccer, toy bullets, or toy shells. That is to say, the ball delivery device 10 can be applied to sports equipment, can also be applied to toy firearms, and can also be used for robot game competitions with launching devices, such as toy pistols or robotic vehicles.
  • the ball delivery device 10 includes a service conduit 12 and a limiting member 14.
  • the ball feeding pipe 12 is formed with an inlet port 122.
  • the limiting member 14 is disposed on the inner wall 124 of the service conduit 12 near the inlet port 122.
  • the limiting member 14 is formed with at least two limiting points 141, and the at least two limiting points 141 and the inner wall 124 form a circular limiting inlet 129.
  • the diameter of the circular limit inlet 129 matches the diameter of the ball 20 to allow the ball 20 to enter the inlet port 122 from the circular limit inlet 129.
  • the ball delivery device 10 of the embodiment of the present invention limits the randomness of the initial position of the ball 20 by setting the limiting member 14 at the entrance, thereby restricting the randomness of the initial position of the ball 20, so that the motion trajectory of the emitted spherical body 20 is stable.
  • the size of the inlet port 122 is greater than or slightly larger than the size of the ball 20 to allow the ball 20 to enter the tee conduit.
  • the size of the inlet port 122 is slightly larger than the size of the table tennis ball; when the ball body 20 is a tennis ball, the size of the inlet port 122 is slightly larger than the size of the tennis ball.
  • the diameter of the teeing duct 12 is larger than the diameter of the ball 20, and therefore, the ball 20 may be tangent to the teeing duct 12 at the circular limiting inlet 129, and therefore only rubs with the tangent portion of the teeing duct 12, and may be
  • the partial limiting member 14 is rubbed, but the frictional area of the spherical body 20 and the circular limiting inlet 129 is much smaller than the frictional area generated by the reduction of the diameter of the inlet nozzle 122 and the spherical body 20, so the frictional force generated is also It is much smaller, so it can improve the phenomenon that the ball 20 is decelerated at the entrance due to friction.
  • the stop member 14 includes a contact member 142 and an elastic member 144 that connects the inner wall 124 and the contact member 142, and at least two limit points 141 are formed on the contact member 142.
  • the outer surface of the ball 20 is pressed against the contact member 142, and the elastic member 144 is compressed to pass the ball 20, so that the circular limit inlet 129 formed by the limiting member 14 can be adapted to different sizes.
  • the sphere 20 may have an error in production, such that the size of the sphere 20 has a slight difference; or the same sphere 20 has a different size specification; it is also possible that the sphere 20 itself has a certain elasticity so that the size of the sphere 20 will follow Minor changes occur in usage time.
  • the arrangement of the elastic members 144 can avoid the problem that the circular limit inlets 129 and the balls 20 do not match due to the difference in size of the balls 20.
  • the resilient member 144 is a spring having one end coupled to the inner wall 124 and the other end coupled to the contact member 142.
  • the spring has a high fatigue limit and can be compressed and restored to its original shape. In this way, the service life of the limiting member 14 can be extended to enhance the user experience.
  • the tee conduit 12 is provided with a guide hole 1242 on the inner wall 124.
  • the limiting member 14 includes a contact member 142 disposed in the guiding hole 1242 and an elastic member 144 connecting the bottom of the guiding hole 1242 and the contact member 142.
  • At least two limit points 141 are formed on the contact member 142, the contact member 142 extends outside the inner wall 124 to expose at least two limit points 141 to the outside of the inner wall 124, and the contact member 142 is used to press the ball 20 against at least two When the limiting point 141 is pressed, the elastic member 144 is compressed and retracted into the guiding hole 1242 along the guiding of the guiding hole 1242.
  • the ball 20 compresses the elastic member 144 and retracts into the guide hole 1242 along the guide hole 1242, restricting the deformation of the elastic member 144 along the axial direction of the ball conduit 12, and the contact member 142 is opposed to the ball 20
  • the axial resistance is small, which is beneficial to reduce the influence of the limiting member 14 on the axial ball speed of the ball 20.
  • the guides of the guide holes 1242 extend in the radial direction of the tee conduit 12.
  • the guide hole 1242 extending along the radial direction of the ball conduit 12 limits the axial deformation of the limiting member 14.
  • the elastic member 144 is deformed only in the radial direction, and the contact member 142 is paired.
  • the radial pressure of the ball 20 is relatively large, thereby better limiting the position of the ball 20 into the ball conduit 12, reducing the randomness of the initial position of the ball 20.
  • the number of the limiting members 14 is one, and at least two of the limiting points 141 are formed on the same limiting member 14 .
  • a limit member 14 is easy to manufacture and install.
  • the limiting member 14 includes a concave arcuate surface (as shown in FIG. 3), and a plurality of limiting points 141 are formed on the concave arcuate surface, and the radius of curvature of the circular arc surface corresponds to the spherical body 20.
  • the radius of curvature of the circular arc surface corresponds to the size specification of the table tennis.
  • the limiting member 14 is formed with two limiting points 141 (such as FIG. 5), and the limiting member 14 forms two limiting points 141 at two points closest to the center of the inlet port 122, and the limiting member 14 can be any shape. In this way, the frictional area of the ball 20 and the circular limit inlet 129 can be reduced.
  • the number of the limiting members 14 is at least two, and each of the limiting members 14 is formed with at least one limiting point 141 .
  • each of the limiting members 14 includes a convex spherical surface such that one of the limiting members 14 is formed only A limit point 141.
  • the ball 20 passes through the inlet port 122, it is tangent to each spherical surface, and the cutting point is the limiting point 141.
  • the limiting member 14 is in contact with the outer surface of the ball 20 only at two cutting points, further reducing the spherical body 20 and The frictional area of the circular limit inlet 129.
  • the tee duct 12 includes a friction duct 126 that forms an inlet port 122
  • the ball delivery device 10 further includes at least one friction wheel 16, and the friction wheel 16 is disposed in the friction tube
  • the side of the 126 is threaded through the side wall 1266 of the friction tube 126 to apply friction to the ball 20 that passes through the friction tube 126.
  • the number of the friction wheels 16 is two, and the two friction wheels 16 are respectively disposed on both sides of the friction duct 16.
  • the two friction wheels 16 rotate in opposite directions. In this way, under the action of the two friction wheels 16, a ball with a larger ball speed and a stronger rotation can be emitted. When the rotational speeds of the two friction wheels 16 are the same, a ball that does not rotate can also be emitted.
  • the friction conduit 126 includes a constricted section 1262 that is disposed on a side of the constricted section 1262, the smallest diameter of the constricted section 1262 corresponding to the diameter of the sphere 20.
  • the friction wheel 16 abuts against the outer surface of the ball 20, and when the ball 20 passes through the friction pipe 126, the friction wheel 16 applies sufficient friction to the ball 20 to improve product quality.
  • the minimum diameter of the constricted section 1262 corresponds to the diameter of the ball 20, meaning that the minimum diameter of the constricted section 1262 is equal to or slightly smaller than the largest diameter of the sphere 20.
  • the number of friction wheels 16 is two and the minimum spacing between the two friction wheels 16 is equal to or slightly less than the largest diameter of the ball 20.
  • the tee duct 12 further includes a ball duct 128 extending from the outlet of the friction duct 126 in the axial direction of the friction duct 126, the ball 20 being ejected from the ball duct 128.
  • the trajectory of the ball 20 is stabilized within the ball duct 128 and then ejected from the ball duct 128.
  • the diameter D1 of the ball duct 128 is greater than the diameter D2 of the inlet port 122 to reduce the probability of collision of the ball 20 into the inner wall 1284 of the ball duct 128 when it is ejected.
  • the probability of the ball 20 colliding with the inner wall 124 of the ball duct 128 when the ball 20 is emitted is reduced, so that the ball 20 can be ejected from the ball duct 128 according to the target trajectory, thereby improving the accuracy of the serve of the ball device 10.
  • the trajectory of the ball 20 will gradually deviate from the central axis 1264 of the friction duct 126 in an arc, thereby increasing the diameter of the ball duct 128 when the trajectory of the sphere 20 As it gradually deviates from the central axis 1264 of the friction tube 126, the probability of colliding with the inner wall 1284 of the ball duct 128 is reduced.
  • the diameter of the ball duct 128 is related to the length of the ball duct 128, and the length of the ball duct 128 is longer. If it is long, the diameter of the ball duct 128 needs to be designed to be larger to reduce the probability of hitting the inner wall 1284 of the ball duct 128 when the ball 20 is ejected.
  • the central axis 1282 of the ball duct 128 coincides with the central axis 1264 of the friction tube 126.
  • the ball duct 128 is coaxial with the friction tube, reducing the probability of the ball 20 colliding with the inner wall 1284 of the ball duct 128 when rotated in different directions.
  • FIG. 2 is a schematic cross-sectional view of the ball-feeding device 10 substantially along the axial direction of the ball-passing pipe 12 and parallel to the axial directions of the two friction wheels 16 .
  • 3-6 are schematic cross-sectional views of the ball delivery device 10 substantially along (eg, passing) the radial face of the inlet port 122 and parallel to the axial direction of the two friction wheels 16.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may include at least one feature, either explicitly or implicitly.
  • a plurality means at least two, for example two, three, unless specifically defined otherwise.

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Abstract

一种发球装置（10），包括发球管道（12）及限位件（14），发球管道（12）形成有入管口（122），限位件（14）靠近入管口（122）并被设置在发球管道（12）的内壁（124）上，限位件（14）形成有至少两个限位点（141），至少两个限位点（141）与内壁（124）形成圆形限位入口（129），圆形限位入口（129）的直径与球体（20）的直径匹配以使球体（20）从圆形限位入口（129）进入入管口（122）。通过在入口处设置限位件（14），从而限制球体（20）进入发球管道（12）的位置，减少球体（20）初始位置的随机性，使得发射出的球体（20）的运动轨迹稳定，有助于准确地发出目标运动轨迹的球。

Description

发球装置 技术领域
本发明涉及球体发射技术，尤其是涉及一种发球装置。
背景技术
为了避免球与发球管道的内壁摩擦，导致球速衰减和影响球的运动轨迹，发球机的发球管道的径向尺寸一般比球大。然而如此，球可能从入管口内的随意位置进入发球管道，球具有随机的初始位置，因此球的运动轨迹也存在随机性，导致发出的球准确度不高。
发明内容
本发明的实施方式提供一种发球装置。
本发明实施方式的发球装置包括：
发球管道，所述发球管道形成有入管口；和
限位件，所述限位件靠近所述入管口设置在所述发球管道的内壁上，所述限位件形成有至少两个限位点，所述至少两个限位点与所述内壁形成圆形限位入口，所述圆形限位入口的直径与所述球体的直径匹配以使所述球体从所述圆形限位入口进入所述入管口。
在某些实施方式中，所述限位件包括接触件和连接所述内壁和所述接触件的弹性件，所述至少两个限位点形成于所述接触件上。
在某些实施方式中，所述发球管道在所述内壁上开设有导孔，
所述限位件包括设置在所述导孔内的接触件和连接所述导孔底部与所述接触件的弹性件，
所述至少两个限位点形成于所述接触件，所述接触件伸出所述内壁外以使所述至少两个限位点暴露在所述内壁外，所述接触件用于在所述球体抵压在所述至少两个限位点时压缩所述弹性件并沿所述导孔的导向缩入所述导孔。
在某些实施方式中，所述导孔的导向沿所述发球管道的径向延伸。
在某些实施方式中，所述限位件的数目为一个，所述至少两个限位点形成于同一个所述限位件上。
在某些实施方式中，所述限位件的数目为至少两个，每个所述限位件形成有至少一个所述限位点。
在某些实施方式中，所述发球管道包括摩擦管道，所述摩擦管道形成所述入管口，所述发球装置还包括至少一个摩擦轮，所述摩擦轮设置在所述摩擦管道的侧面并穿设所述摩擦管道的侧壁以对经过所述摩擦管道的所述球体施加摩擦力。
在某些实施方式中，所述摩擦管道包括紧缩段，所述摩擦轮设置在所述紧缩段的侧面，所述紧缩段的最小直径与所述球体的直径对应。
在某些实施方式中，所述发球管道还包括自所述摩擦管道的出口沿所述摩擦管道的轴向方向延伸的射球管道，所述球体从所述射球管道射出。
在某些实施方式中，所述射球管道的直径大于所述入管口的直径以使所述球体射出时减小碰撞到所述射球管道的内壁的几率。
在某些实施方式中，所述射球管道的中心轴线与所述摩擦管道的中心轴线重合。
本发明实施方式的发球装置，通过在入口处设置限位件，从而限制球体进入发球管道的位置，减少球体初始位置的随机性，使得发射出的球体的运动轨迹稳定，有助于准确地发出目标运动轨迹的球。
本发明的实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实施方式的实践了解到。
附图说明
本发明的实施方式的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本发明实施方式提供的发球装置的立体示意图；
图2是本发明实施方式提供的发球装置的一个剖面示意图；
图3是本发明实施方式提供的发球装置的另一个剖面示意图；
图4是本发明另一个实施方式提供的发球装置的剖面示意图；
图5是本发明又一个实施方式提供的发球装置的剖面示意图；
图6是本发明再一个实施方式提供的发球装置的剖面示意图。
主要元件符号说明：
发球装置10，发球管道12，入管口122，内壁124、1284，导孔1242，摩擦管道126，紧缩段1262，侧壁1266，射球管道128，中心轴线1264、1282，圆形限位入口129，限位件14，限位点141，接触件142，弹性件144，摩擦轮16，球体20。
具体实施方式
下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
请参阅图1，本发明实施方式的发球装置10，可应用于但不限于发射乒乓球、网球、足球、玩具子弹或玩具炮弹等球体20。也即是说，发球装置10可以应用于体育器材，也可以应用于玩具枪械，也可以用于具有发射装置的机器人游戏对抗赛，例如玩具手枪或者机器人战车等。
请一并参阅图2和图3，发球装置10包括发球管道12和限位件14。
发球管道12形成有入管口122。
限位件14靠近入管口122设置在发球管道12的内壁124上，限位件14形成有至少两个限位点141，至少两个限位点141与内壁124形成圆形限位入口129，圆形限位入口129的直径与球体20的直径匹配以使球体20从圆形限位入口129进入入管口122。
本发明实施方式的发球装置10，通过在入口处设置限位件14，从而限制球体20进入发球管道12的位置，减少球体20初始位置的随机性，使得发射出的球体20的运动轨迹稳定，有助于准确地发出目标运动轨迹的球。
具体地，入管口122的尺寸大于或略大于球体20的尺寸以使球体20进入发球管道，如此，避免球体20经过入管口122时与入管口122之间过多的摩擦影响球体20的球速。例如，当球体20为乒乓球时，入管口122的尺寸略大于乒乓球的尺寸；当球体20为网球时，入管口122的尺寸则略大于网球的尺寸。
可以理解，发球管道12的管径大于球体20的直径，因此，球体20在圆形限位入口129处可能与发球管道12相切，因此仅与发球管道12的相切部分摩擦，并可能与部分限位件14发生摩擦，但是，球体20与圆形限位入口129的摩擦面积相较于通过缩小入管口122与球体20的直径配合发生的摩擦面积要小很多，因此产生的摩擦力也要小很多，因此可以改善球体20在入口处因受摩擦而减速的现象。
在某些实施方式中，限位件14包括接触件142和连接内壁124和接触件142的弹性件144，至少两个限位点141形成于接触件142上。
如此，当球体20经过入管口122时，球体20的外表面抵压在接触件142上，弹性件144压缩使球体20通过，使得限位件14形成的圆形限位入口129可以适应尺寸不同的球体20。
具体地，球体20在生产时可能存在误差，使得球体20的尺寸有微小的差距；或者同一种球体20有不同的尺寸规格；还有可能球体20本身具有一定的弹性导致球体20的尺寸会随着使用时间发生微小的变化。弹性件144的设置可以避免因球体20的尺寸差异导致圆形限位入口129与球体20不匹配的问题。
可以理解，如此还可以减小限位件14对球体20施加的摩擦力，从而进一步改善球体20在入口处因受摩擦而减速的现象。
在一个例子中，弹性件144为弹簧，弹簧的一端连接在内壁124上，另一端连接在接触件142上。
弹簧的疲劳极限高，可多次被压缩和恢复原状。如此，可延长限位件14的使用寿命，提升用户体验。
在某些实施方式中，发球管道12在内壁124上开设有导孔1242。
限位件14包括设置在导孔1242内的接触件142和连接导孔1242底部与接触件142的弹性件144。
至少两个限位点141形成于接触件142，接触件142伸出内壁124外以使至少两个限位点141暴露在内壁124外，接触件142用于在球体20抵压在至少两个限位点141时压缩弹性件144并沿导孔1242的导向缩入导孔1242。
如此，当球体20经过入管口122时，球体20压缩弹性件144并沿导孔1242的导向缩入导孔1242，限制弹性件144的沿发球管道12轴向的形变，接触件142对球体20轴向的造成阻力较小，有利于减小限位件14对球体20轴向球速的影响。
请参阅图4，在某些实施方式中，导孔1242的导向沿发球管道12的径向延伸。
如此，沿发球管道12的径向延伸的导孔1242限制限位件14的轴向的形变，当球体20经过入管口122时，弹性件144仅在径向方向上发生形变，接触件142对球体20径向的压力较大，进而更好的限制球体20进入发球管道12的位置，减少球体20初始位置的随机性。
请参阅图3及图5，在某些实施方式中，限位件14的数目为一个，至少两个限位点141形成于同一个限位件14上。
如此，一个限位件14易于生产和安装。
在一个例子中，限位件14包括内凹的圆弧面(如图3)，多个限位点141形成于内凹圆弧面上，圆弧面的曲率半径与球体20对应。例如当发球装置10用于发射乒乓球时，圆弧面的曲率半径则与乒乓球的尺寸规格对应。
在另一个例子中，限位件14上形成有两个限位点141(如图5)，限位件14距离入管口122圆心最近的两点处形成两个限位点141，限位件14可以为任意形状。如此，可减小球体20与圆形限位入口129的摩擦面积。
请参阅图6，在某些实施方式中，限位件14的数目为至少两个，每个限位件14形成有至少一个限位点141。
如此，可减小球体20与圆形限位入口129的摩擦面积，进而减小限位件14对球体20轴向速度的影响。
在一个例子中，每个限位件14包括一个凸出的球面，如此，一个限位件14仅形成 一个限位点141。当球体20经过入管口122时，与每个球面相切，切点即为限位点141，限位件14仅在两个切点处与球体20的外表面接触，进一步减小球体20与圆形限位入口129的摩擦面积。
请再次参阅图2及图3，在某些实施方式中，发球管道12包括摩擦管道126，摩擦管道126形成入管口122，发球装置10还包括至少一个摩擦轮16，摩擦轮16设置在摩擦管道126的侧面并穿设摩擦管道126的侧壁1266以对经过摩擦管道126的球体20施加摩擦力。
如此，当摩擦轮16旋转时，在摩擦管道126内对球体20施加摩擦以改变球体20的球速或者使球体20旋转，使发球装置10发出不同球速、不同旋转的球。
具体地，摩擦轮16的数量为两个，两个摩擦轮16分别设置在摩擦管道16的两侧。两个摩擦轮16的旋转方向相反。如此，在两个摩擦轮16的作用下，可发出球速更大、旋转更强的球。当两个摩擦轮16的旋转速度一致时，也可以发出不旋转的球。
在某些实施方式中，摩擦管道126包括紧缩段1262，摩擦轮16设置在紧缩段1262的侧面，紧缩段1262的最小直径与球体20的直径对应。
如此，球体20在经过紧缩段1262时，摩擦轮16紧贴球体20的外表面，确保球体20经过摩擦管道126时，摩擦轮16对球体20施加足够的摩擦力，提升产品品质。
具体地，紧缩段1262的最小直径与球体20的直径对应是指紧缩段1262的最小直径等于或略小于球体20的最大直径。
在一个例子中，摩擦轮16的数量为两个，两个摩擦轮16之间的最小间距等于或略小于球体20最大的直径。
在某些实施方式中，发球管道12还包括自摩擦管道126的出口沿摩擦管道126的轴向方向延伸的射球管道128，球体20从射球管道128射出。
如此，使得球体20的运动轨迹在射球管道128内稳定了之后再从射球管道128射出。
在某些实施方式中，射球管道128的直径D1大于入管口122的直径D2以使球体20射出时减小碰撞到射球管道128的内壁1284的几率。
如此，减小球体20射出时碰撞到射球管道128的内壁124的几率，使球体20可以按照目标轨迹从射球管道128射出，提高发球装置10的发球准确度。可以理解，从摩擦管道126射出的球体20带有旋转时，球体20的轨迹将会呈弧线逐渐偏离摩擦管道126的中心轴线1264，因此增大射球管道128的直径，当球体20的轨迹逐渐偏离摩擦管道126的中心轴线1264时，减小碰撞到射球管道128内壁1284的几率。
具体地，射球管道128的直径与射球管道128的长度有关，射球管道128的长度越 长，则需将射球管道128的直径设计得越大以使球体20射出时减小碰撞到射球管道128的内壁1284的几率。
在某些实施方式中，射球管道128的中心轴线1282与摩擦管道126的中心轴线1264重合。
如此，射球管道128与摩擦管同轴，减小球体20的朝不同方向旋转时碰撞到射球管道128的内壁1284的几率。
可以理解，若球体20的旋转速度相同，当发出的球体20的轨迹为向上的弧线时，球体20在射球管道128内不会碰撞到射球管道128的内壁1284，那么当球体20的轨迹为向下的弧线时，也不会碰撞到射球管道128的内壁1284。
需进一步说明的是，图2是发球装置10基本沿(例如经过)发球管道12的轴向且平行于两个摩擦轮16的轴向的截面示意图。图3-6是发球装置10基本沿(例如经过)入管口122的径向面且平行于两个摩擦轮16的轴向的截面示意图。
在本说明书的描述中，参考术语“某些实施方式”、“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”的描述意指结合实施方式或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个，除非另有明确具体的限定。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。

Claims (11)

  1. 一种发球装置，用于发射球体，其特征在于，所述发球装置包括：
    发球管道，所述发球管道形成有入管口；和
    限位件，所述限位件靠近所述入管口设置在所述发球管道的内壁上，所述限位件形成有至少两个限位点，所述至少两个限位点与所述内壁形成圆形限位入口，所述圆形限位入口的直径与所述球体的直径匹配以使所述球体从所述圆形限位入口进入所述入管口。
  2. 根据权利要求1所述的发球装置，其特征在于，所述限位件包括接触件和连接所述内壁和所述接触件的弹性件，所述至少两个限位点形成于所述接触件上。
  3. 根据权利要求1所述的发球装置，其特征在于，所述发球管道在所述内壁上开设有导孔，
    所述限位件包括设置在所述导孔内的接触件和连接所述导孔底部与所述接触件的弹性件，
    所述至少两个限位点形成于所述接触件，所述接触件伸出所述内壁外以使所述至少两个限位点暴露在所述内壁外，所述接触件用于在所述球体抵压在所述至少两个限位点时压缩所述弹性件并沿所述导孔的导向缩入所述导孔。
  4. 根据权利要求3所述的发球装置，其特征在于，所述导孔的导向沿所述发球管道的径向延伸。
  5. 根据权利要求1所述的发球装置，其特征在于，所述限位件的数目为一个，所述至少两个限位点形成于同一个所述限位件上。
  6. 根据权利要求1所述的发球装置，其特征在于，所述限位件的数目为至少两个，每个所述限位件形成有至少一个所述限位点。
  7. 根据权利要求1所述的发球装置，其特征在于，所述发球管道包括摩擦管道，所述摩擦管道形成所述入管口，所述发球装置还包括至少一个摩擦轮，所述摩擦轮设置在所述摩擦管道的侧面并穿设所述摩擦管道的侧壁以对经过所述摩擦管道的所述球体施 加摩擦力。
  8. 根据权利要求7所述的发球装置，其特征在于，所述摩擦管道包括紧缩段，所述摩擦轮设置在所述紧缩段的侧面，所述紧缩段的最小直径与所述球体的直径对应。
  9. 根据权利要求7所述的发球装置，其特征在于，所述发球管道还包括自所述摩擦管道的出口沿所述摩擦管道的轴向方向延伸的射球管道，所述球体从所述射球管道射出。
  10. 根据权利要求9所述的发球装置，其特征在于，所述射球管道的直径大于所述入管口的直径以使所述球体射出时减小碰撞到所述射球管道的内壁的几率。
  11. 根据权利要求9所述的发球装置，其特征在于，所述射球管道的中心轴线与所述摩擦管道的中心轴线重合。
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