Mechanical foot-operated pitching machine

Abstract

The utility model discloses a mechanical treading pitching machine which comprises a seat body, a pitching frame, a pedal, a delay mechanism, a limiting piece and a spring, the seat body is provided with a pitching area, and the pitching area is provided with a pitching opening; the ball-serving frame is provided with a ball-hitting plate. The pedal is rotationally arranged on the ball serving frame and provided with a linkage part, and the linkage part is located above the ball hitting plate; the limiting piece is rotatably arranged in the service area and used for being in contact with the batting plate for limiting, the time delay mechanism is used for being in contact with and locking the limiting piece and delaying unlocking of the limiting piece, and the time delay mechanism is provided with a contact part; two ends of the spring respectively act on the ball hitting plate and the ball serving frame; in this way, ball serving is achieved by making contact with the limiting piece for limiting, making contact with the delay mechanism and locking, making the delay mechanism unlocked after a certain time and making the ball hitting plate hit a ball under the reset action of the spring, and the ball serving machine adopts pure mechanical ball serving actions, does not need electric power, saves energy, is environmentally friendly, is easy to operate, convenient to use and wide in application range.

Description

Technical Field

[0001] The utility model relates to the field of ball serving machines, in particular to a mechanical foot-operated ball serving machine. Background Art

[0002] As people's living standards continue to improve, more and more people realize the importance of having good physical fitness, and gradually strengthen various sports training. Therefore, there is an increasingly broad market for various ball sports equipment. When people practice, they will use ball machines to practice to reduce the need for accompanying personnel to pick up balls. One person can practice playing ball with the training machine, effectively improving their competitive skills and achieving the purpose of exercise.

[0003] Most traditional baseball serving machines work by placing balls on the serving mechanism of the machine and using the serving mechanism to hit the balls, thereby achieving a rising serve of the balls in place, while the practitioners practice hitting the balls next to them. However, the existing baseball serving machines have poor structural design. Most of the baseball serving machines use an electric-controlled serving mechanism to serve baseballs and other balls, which makes the serving machines limited by power conditions, resulting in insufficient power and inability to operate normally. In addition, when there is no charging field, the serving machine cannot be used normally due to exhaustion of power, which is not conducive to the practice needs of practitioners, reduces the user experience, and has a small scope of application.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0005] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a mechanical foot-operated ball serving machine, which utilizes a hitting plate to contact and limit a position with a limiting member, and the limiting member to contact and lock a delay mechanism, and the delay mechanism is unlocked after a certain period of time. The hitting plate hits the ball under the resetting action of the spring to realize the serving of the ball. The ball serving machine adopts a purely mechanical serving action, does not require electricity, is energy-saving and environmentally friendly, is simple to operate, easy to use, and has a wide range of applications.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The invention relates to a mechanical foot-operated ball serving machine, comprising a base, a serving rack, a pedal, a delay mechanism, a limiter, and a spring, wherein: the base has a serving area, an upper end of the serving area is provided with a serving hole; the serving rack is provided with a hitting plate, one end of the hitting plate is rotatably provided on the serving rack, and the other end thereof extends into the serving area; one end of the pedal is rotatably provided on the serving rack, and the other end thereof is exposed outside the base; the pedal is provided with a linkage portion for contacting the hitting plate, and the linkage portion is located above the hitting plate; the limiter is rotatably provided on the serving area and located in front of the hitting plate, and the limiter is used to contact and limit the hitting plate; the delay mechanism is provided behind the limiter and located below the hitting plate, the delay mechanism is used to contact and lock the limiter and delay unlocking of the limiter, and the delay mechanism is provided with a contact portion for contacting and connecting with the limiter; and the two ends of the spring act on the hitting plate and the serving rack respectively.

[0008] As a preferred solution, the delay mechanism includes a housing, an incomplete gear and a damping gear set. The front side of the housing is provided with a movable groove extending up and down, the contact portion is provided on the front side of the incomplete gear, the incomplete gear is rotatably provided on the housing, the contact portion passes through the movable groove and is exposed outside the housing, the rear side of the incomplete gear is provided with a convex tooth for engaging with the damping gear set, and the damping gear set is provided inside the housing and located on the rear side of the incomplete gear.

[0009] As a preferred solution, a slot is provided on the front side of the incomplete gear for the limiting member to match and position, and the contact portion is arranged at the upper end of the slot. Correspondingly, a locking protrusion is provided on the limiting member, and the locking protrusion extends into the slot and contacts the contact portion.

[0010] As a preferred solution, a contact slope is provided on the upper end of the clamping protrusion, and the contact slope extends obliquely downward from the front to the back, and the contact slope contacts the contact portion.

[0011] As a preferred solution, a limiting groove is provided on the limiting member, and the hitting plate is limited by the limiting groove.

[0012] As a preferred embodiment, a goal area is provided on the seat body, and the goal area is located at the upper rear side of the serving area. The hitting plate is extended obliquely upward from front to back, the rear end of the hitting plate is provided on the serving rack, and the front end of the hitting plate is provided on the serving area. The goal area has a guide slope extending obliquely toward the serving area, and a first stop part for stopping the movement of the ball is provided at the upper rear end of the hitting plate, and an opening connected to the interior of the seat body is provided on the guide slope, and the first stop part extends into the goal area through the opening. When the hitting plate rotates forward and downward in conjunction with the pedal, the first stop part rotates forward and downward together and extends into the interior of the seat body from the opening to release the stop on the ball in the goal area. The ball located in the goal area moves toward the serving area and enters the serving area under the guidance of the guide slope.

[0013] As a preferred embodiment, an external ball lane is further included, which is arranged at the upper end of the seat body and located on the upper side of the goal area, and the external ball lane is connected to the goal area through the goal opening; and the hitting board is also provided with a second stop portion for stopping the ball from being scored at the goal opening, and the second stop portion is located on the lower rear side of the first stop portion and on the lower side of the opening.

[0014] As a preferred solution, the serving rack is provided with a spring mounting seat, and the spring mounting seat is provided with a spring connecting sleeve for connecting with the spring, the spring connecting sleeve can be movably arranged on the spring mounting seat, and the front end of the spring connecting sleeve is provided with a connecting groove for spring installation and positioning, and one end of the spring is arranged on the connecting groove;

[0015] In addition, the seat body is provided with an adjustment component for adjusting the height of the serve, and the adjustment component includes a knob, a connecting rod and an adjustment piece. The connecting rod is arranged to extend laterally, and both ends of the connecting rod are rotatably connected to the seat body. The connecting rod is located on the rear side of the spring connecting sleeve, and the knob is arranged on the outside of the seat body and connected to the connecting rod. The connecting rod rotates on the seat body under the control of the knob. The adjustment piece has a center hole that passes through the left and right, and the adjustment piece is arranged on the connecting rod through the center hole. The outside of the adjustment piece is provided with a plurality of contact edges arranged in sequence around the center hole, and the distance between each contact edge and the center hole is not equal. The adjustment piece contacts with the spring connecting sleeve through the contact edge.

[0016] As a preferred solution, four contact edges are provided.

[0017] As a preferred solution, an elastic reset member for resetting the pedal is provided between the pedal and the seat body, so that after the user releases the pedal, the pedal resets upward under the elastic action of the elastic reset member.

[0018] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that it mainly realizes the following advantages: through the arrangement of various components, the pedal is used to link the hitting plate with the limit member to contact and limit the position, the limit member contacts and locks the delay mechanism, and the delay mechanism unlocks the lock of the limit member after a certain delay. The hitting plate rotates upward under the resetting action of the spring and hits the ball in the serving area to realize the serving of the ball. In particular, the serving machine adopts a purely mechanical serving action, does not require electricity, is energy-saving and environmentally friendly, is simple to operate, is easy to use, is conducive to the practice of the practitioner, improves the user experience, and has a wide range of applications;

[0019] Secondly, the arrangement of the card slot and the card protrusion is conducive to the contact and limit between the limiter and the delay mechanism, thereby improving the stability of the product. At the same time, the arrangement of the limit slot facilitates the contact and limit between the batting plate and the limiter, thereby improving the usability.

[0020] Furthermore, the arrangement of the first stopper, the second stopper, and the external ball lane allows the balls to be placed one by one on the serving area by extending and retracting the first stopper and the second stopper, which is convenient to use and highly practical. Furthermore, the arrangement of the adjustment assembly controls the adjustment of the spring connecting sleeve on the spring mounting seat according to the contact between the spring connecting sleeve and the contact edge on the corresponding side, thereby adjusting the tension of the spring and the preload force of the hitting plate, thereby enabling the balls to be served at different heights on the serving area, which is conducive to meeting the practice needs of users.

[0021] In addition, the elastic reset member allows the pedal to reset upward under the elastic action of the elastic reset member after the user releases the pedal, avoiding the contact between the hitting plate and the linkage part when hitting the ball upward, which may cause damage to the hitting plate and the linkage part, thereby ensuring the stability of the ball machine and a long service life.

[0022] In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present utility model;

[0024] Figure 2 It is a cross-sectional view of an embodiment of the present utility model;

[0025] Figure 3 It is a partial enlarged schematic diagram of the hitting plate, the limiting member and the delay mechanism of the embodiment of the utility model;

[0026] Figure 4 It is a partially enlarged schematic diagram of the spring, spring mounting seat, spring connecting sleeve and adjusting member of an embodiment of the present utility model.

[0027] Description of the accompanying drawings:

[0028] 101, first positioning groove 102, second positioning groove

[0029] 10. Seat 11. Ball rack

[0030] 111. Batting plate 112. First stopper

[0031] 113. Second stopper 114. Spring mounting seat

[0032] 115. Spring connection sleeve 116. Connection groove

[0033] 117, chute 12, pedal

[0034] 121, linkage unit 13, delay mechanism

[0035] 131. Contact portion 132. Box

[0036] 133. Incomplete gear 134. Damping gear set

[0037] 135, convex teeth 136, slot

[0038] 14. Limiting member 141, card convex

[0039] 142. Contact slope 143. Limiting groove

[0040] 15. Spring 16. Service Area

[0041] 161, service port 17, goal area

[0042] 171. Guide slope 172. Opening

[0043] 18. External fairway 181. Goal gate

[0044] 19. Adjustment component 191. Knob

[0045] 192, connecting rod 193, adjusting piece

[0046] 194. Center hole 195. Contact edge. DETAILED DESCRIPTION

[0047] Please refer to Figures 1 to 4 As shown, it shows the specific structure of an embodiment of the present utility model.

[0048] A mechanical foot-operated ball serving machine includes a base 10 and a serving rack 11, a pedal 12, a delay mechanism 13, a limiter 14, and a spring 15 disposed on the base 10, wherein:

[0049] The seat body 10 has a serving area 16, with a serving hole 161 provided at the upper end of the serving area 16; a hitting plate 111 is provided on the serving rack 11, one end of the hitting plate 111 is rotatably mounted on the serving rack 11, and the other end thereof extends into the serving area 16; one end of the pedal 12 is rotatably mounted on the serving rack 11, and the other end thereof is exposed outside the seat body 10; the pedal 12 is provided with a linkage portion 121 for contacting the hitting plate, the linkage portion 121 being a linkage rod and located above the hitting plate 111; a limiting member 14 is rotatably mounted on the serving area 16 and located in front of the hitting plate 111, and the limiting member 14 is configured to contact and limit the hitting plate 111;

[0050] The delay mechanism 13 is arranged behind the limiter 14 and below the hitting plate 111. The delay mechanism 13 is used to contact and lock the limiter and delay the unlocking of the limiter. The delay mechanism 13 is provided with a contact portion 131 for contacting and connecting with the limiter. Specifically, the delay mechanism 13 includes a box body 132, an incomplete gear 133 and a damping gear set 134. The front side of the box body 132 is provided with an active groove (not shown in the figure) extending up and down. The contact portion 131 is provided on the incomplete gear. On the front side of the gear 133, the incomplete gear 133 is rotatably mounted on the housing 132, the contact portion 131 is exposed outside the housing 132 through the movable slot, and the rear side of the incomplete gear 133 is provided with a convex tooth for engaging with a damping gear set 134. The damping gear set 134 is disposed inside the housing 132 and located on the rear side of the incomplete gear 133. The damping gear set 134 includes a plurality of damping gears that are meshed in sequence, and the damping gear located on the front side is meshed with the incomplete gear 133;

[0051] The two ends of the spring 15 act on the hitting plate 111 and the serving rack 11 respectively;

[0052] When in use, the user steps on the pedal to control the linkage part to move downward and contact the hitting plate, and the linkage hitting plate rotates downward and contacts the limit piece for a limited position. The limit piece contacts and locks with the contact part under the control of the hitting plate, and the spring is compressed between the hitting plate and the serving rack. The delay mechanism unlocks the lock of the limit piece after a certain delay, and the hitting plate rotates upward under the elastic return action of the spring and hits the ball in the serving area, so as to realize the serving of the ball. In this way, through the arrangement of various components, the pedal is used to link the hitting plate and contact the limit piece, the limit piece contacts and locks with the delay mechanism, and the delay mechanism unlocks the lock of the limit piece after a certain delay, and the hitting plate rotates upward under the return action of the spring and hits the ball in the serving area, so as to realize the serving of the ball. In particular, the serving machine adopts a purely mechanical serving action, does not require electricity, is energy-saving and environmentally friendly, is simple to operate, is easy to use, is conducive to the practice of practitioners, improves the user experience effect, and has a wide range of applications.

[0053] The front side of the incomplete gear 133 is provided with a slot 136 for the matching positioning of the limit member, and the contact portion 131 is arranged at the upper end of the slot 136. Correspondingly, the limit member 14 is provided with a protrusion 141, which extends into the slot 136 and contacts the contact portion 131. Preferably, the upper end of the protrusion 141 is provided with a contact inclined surface 142, which extends obliquely downward from the front to the back, and contacts the contact portion 131. In addition, a limiting groove 143 is provided on the limit member 14, and the batting plate 111 is limited by the limiting groove 143. In this way, the setting of the slot and the protrusion is conducive to the contact limiting between the limit member and the delay mechanism, thereby improving the stability of the product. At the same time, the setting of the limiting groove facilitates the contact limiting between the batting plate and the limit member, and has good usability.

[0054] In addition, an elastic reset member (not shown in the figure) for resetting the pedal is provided between the pedal 12 and the base body 10. The elastic reset member is a reset spring, so that after the user releases the pedal, the pedal resets upward under the elastic action of the elastic reset member, avoiding the contact between the hitting plate and the linkage part when hitting the ball upward, thereby avoiding damage to the hitting plate and the linkage part, thereby ensuring the stability of the use of the ball machine and a long service life.

[0055] The seat 10 is provided with a goal area 17, and the goal area 17 is located at the upper rear side of the serving area 16. The hitting plate 111 is extended obliquely upward from the front to the back. The rear end of the hitting plate 111 is set on the serving rack 11, and the front end of the hitting plate 111 is set on the serving area 16. The goal area 17 has a guide slope 171 extending obliquely toward the serving area. The upper rear end of the hitting plate 111 is provided with a first stopper 112 for stopping the movement of the ball. The guide slope 171 defines an opening 172 that communicates with the interior of the seat body. The first stopper 112 extends through the opening 172 into the goal area 17. When the striking plate 111 rotates forward and downward in conjunction with the pedal 12, the first stopper 112 rotates forward and downward together and extends into the interior of the seat body 10 through the opening 172, thereby releasing the ball in the goal area 17. The ball in the goal area 17 moves toward the serving area 16 guided by the guide slope 171 and enters the serving area 16.

[0056] The ball striking plate 111 further includes an external ball lane 18, which is disposed at the upper end of the base 10 and located above the goal area 17. The external ball lane 18 is connected to the goal area 17 through a goal opening 181. Furthermore, the striking plate 111 is provided with a second stopper 113 for stopping a ball from entering the goal opening. The second stopper 113 is located behind and below the first stopper 112 and below the opening 172.

[0057] When in use, when the first stop portion extends into the interior of the seat body from the opening, the second stop portion extends from the opening to stop the ball in the external ball lane at the goal hole. When the first stop portion extends out of the seat body from the opening, the second stop portion extends into the interior of the seat body from the opening to release the ball stop at the goal hole, and the ball enters the goal area from the goal hole and stops on the first stop portion. In this way, the arrangement of the first stop portion, the second stop portion and the external ball lane utilizes the extension and extension of the first stop portion and the second stop portion to realize the serving operation of the balls entering the serving area one by one, which is easy to use and highly practical.

[0058] Furthermore, the serving rack 11 is provided with a spring mounting seat 114, and a spring connecting sleeve 115 for connecting to a spring is provided on the spring mounting seat 114. The spring connecting sleeve 115 can be movably arranged on the spring mounting seat 114 in a forward and backward manner. Specifically, the left and right sides of the spring connecting seat 114 are provided with a slide groove 116 extending forward and backward. The left and right sides of the spring connecting sleeve 115 are provided with a slider matching the slide groove (not shown in the figure). The slider is adapted to be positioned on the slide groove 117 on the corresponding side. The front end of the spring connecting sleeve 115 is provided with a connecting groove 116 for spring installation and positioning, and one end of the spring 15 is provided on the connecting groove 116.

[0059] In addition, the seat body 10 is provided with an adjustment component 19 for adjusting the height of the serve, and the adjustment component 19 includes a knob 191, a connecting rod 192 and an adjustment member 193. The connecting rod 192 is arranged to extend laterally. Both ends of the connecting rod 192 are rotatably connected to the seat body 10. The connecting rod 192 is located on the rear side of the spring connecting sleeve 115. The knob 191 is arranged on the outside of the seat body 10 and is connected to the connecting rod 192. The connecting rod 192 is controlled by the knob 191 and moves on the seat body 10. Rotation, the adjusting member 193 has a central hole 194 that passes through the left and right sides. The adjusting member 193 is set on the connecting rod 192 through the central hole 194. The outer side of the adjusting member 193 is provided with a plurality of contact edges 195 arranged in sequence around the central hole. The distance between each contact edge 195 and the central hole 194 is unequal. The adjusting member 193 contacts the spring connecting sleeve 115 through the contact edge 195. Preferably, four contact edges 195 are provided, and arc-shaped transition edges are provided between adjacent contact edges 195.

[0060] During use, the knob is used to control the rotation of the connecting rod to rotate the adjusting part, and the contact edge on the corresponding side is contacted with the spring connecting sleeve. According to the size of the distance between the contact edge and the center hole, the spring connecting sleeve is controlled to move forward or backward on the spring mounting seat to adjust the tension of the spring, thereby adjusting the pre-tightening force of the hitting plate, thereby achieving different serving heights, thereby meeting the user's hitting needs and having good usability.

[0061] Preferably, the seat body 10 is provided with a first positioning groove 101 for limiting the up and down movement range of the hitting plate and a second positioning groove 102 for limiting the up and down movement range of the pedal. The first positioning groove 101 is provided on the front side of the serving area 16, and the second positioning groove 102 is provided on the front side of the seat body 10, thereby improving the stability of the hitting plate and the pedal.

[0062] The design focus of the utility model is that it mainly utilizes the arrangement of various components, utilizes the pedal linkage to limit the contact of the hitting plate with the limiting member, the limiting member contacts and locks with the delay mechanism, and the delay mechanism unlocks the lock of the limiting member after a certain delay, and the hitting plate rotates upward under the resetting action of the spring and hits the ball in the serving area to achieve the serving of the ball. In particular, the serving machine adopts a purely mechanical serving action, does not require electricity, is energy-saving and environmentally friendly, is simple to operate, is easy to use, is conducive to the practice of the practitioner, improves the user experience effect, and has a wide range of applications.

[0063] Secondly, the arrangement of the card slot and the card protrusion is conducive to the contact and limit between the limiter and the delay mechanism, thereby improving the stability of the product. At the same time, the arrangement of the limit slot facilitates the contact and limit between the batting plate and the limiter, thereby improving the usability.

[0064] Furthermore, the arrangement of the first stopper, the second stopper, and the external ball lane allows the balls to be placed one by one on the serving area by extending and retracting the first stopper and the second stopper, which is convenient to use and highly practical. Furthermore, the arrangement of the adjustment assembly controls the adjustment of the spring connecting sleeve on the spring mounting seat according to the contact between the spring connecting sleeve and the contact edge on the corresponding side, thereby adjusting the tension of the spring and the preload force of the hitting plate, thereby enabling the balls to be served at different heights on the serving area, which is conducive to meeting the practice needs of users.

[0065] In addition, the elastic reset member allows the pedal to reset upward under the elastic action of the elastic reset member after the user releases the pedal, avoiding the contact between the hitting plate and the linkage part when hitting the ball upward, which may cause damage to the hitting plate and the linkage part, thereby ensuring the stability of the ball machine and a long service life.

[0066] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A mechanical foot-operated ball serving machine, characterized in that: The invention also provides a method for the swinging mechanism to move the swinging mechanism forward and backward, and a method for the swinging mechanism to move the swinging mechanism forward and backward, so that the swinging mechanism can be adjusted according to the swinging mechanism's movement.

2. A mechanical foot-operated ball serving machine according to claim 1, characterized in that: The delay mechanism includes a housing, an incomplete gear and a damping gear set. The front side of the housing is provided with a movable groove extending up and down. The contact portion is provided on the front side of the incomplete gear. The incomplete gear is rotatably provided on the housing. The contact portion passes through the movable groove and is exposed outside the housing. The rear side of the incomplete gear is provided with a convex tooth for engaging with the damping gear set. The damping gear set is provided inside the housing and is located on the rear side of the incomplete gear.

3. A mechanical foot-operated ball serving machine according to claim 2, characterized in that: A slot is provided on the front side of the incomplete gear for the position limiting member to match and position. The contact portion is provided at the upper end of the slot. Correspondingly, a locking protrusion is provided on the position limiting member. The locking protrusion extends into the slot and contacts the contact portion.

4. A mechanical foot-operated ball serving machine according to claim 3, characterized in that: A contact slope is provided on the upper end of the clamping protrusion. The contact slope extends obliquely downward from the front to the rear, and the contact slope contacts the contact portion.

5. The mechanical foot-operated ball serving machine according to claim 1, characterized in that: The limiting member is provided with a limiting groove, and the hitting plate is limited by the limiting groove.

6. The mechanical foot-operated ball serving machine according to claim 1, characterized in that: The seat body is provided with a goal area, and the goal area is located at the upper rear side of the serving area. The hitting plate is extended obliquely upward from the front to the back, the rear end of the hitting plate is provided on the serving rack, and the front end of the hitting plate is provided on the serving area. The goal area has a guide slope extending obliquely toward the serving area, and the upper rear end of the hitting plate is provided with a first stop portion for stopping the movement of the ball. The guide slope is provided with an opening connected to the interior of the seat body, and the first stop portion extends into the goal area through the opening. When the hitting plate rotates forward and downward in conjunction with the pedal, the first stop portion rotates forward and downward together and extends into the interior of the seat body from the opening to release the stop on the ball in the goal area. The ball located in the goal area moves toward the serving area and enters the serving area under the guidance of the guide slope.

7. The mechanical foot-operated ball serving machine according to claim 6, characterized in that: It also includes an external ball lane, which is arranged at the upper end of the seat body and located on the upper side of the goal area. The external ball lane is connected to the goal area through the goal hole. In addition, the hitting board is also provided with a second stop portion for stopping the ball from entering the goal hole. The second stop portion is located on the lower rear side of the first stop portion and on the lower side of the opening.

8. The mechanical foot-operated ball serving machine according to claim 1, characterized in that: The serving rack is provided with a spring mounting seat, and the spring mounting seat is provided with a spring connecting sleeve for connecting with the spring. The spring connecting sleeve can be movably arranged on the spring mounting seat. The front end of the spring connecting sleeve is provided with a connecting groove for spring installation and positioning, and one end of the spring is arranged on the connecting groove; In addition, the seat body is provided with an adjustment component for adjusting the height of the serve, and the adjustment component includes a knob, a connecting rod and an adjustment piece. The connecting rod is arranged to extend laterally, and both ends of the connecting rod are rotatably connected to the seat body. The connecting rod is located on the rear side of the spring connecting sleeve, and the knob is arranged on the outside of the seat body and connected to the connecting rod. The connecting rod rotates on the seat body under the control of the knob. The adjustment piece has a center hole that passes through the left and right, and the adjustment piece is arranged on the connecting rod through the center hole. The outside of the adjustment piece is provided with a plurality of contact edges arranged in sequence around the center hole, and the distance between each contact edge and the center hole is not equal. The adjustment piece contacts with the spring connecting sleeve through the contact edge.

9. The mechanical foot-operated ball serving machine according to claim 8, characterized in that: There are four contact edges.

10. The mechanical foot-operated ball serving machine according to claim 1, characterized in that: An elastic reset member for resetting the pedal is provided between the pedal and the seat body.

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