38results about How to "Improve serving efficiency" patented technology

The invention relates to a ball server, in particular to a table tennis server. Therefore, the invention aims to provide a table tennis server which can prevent arm ache and improve serving efficiency. The table tennis server comprises a support, a stand, a stopping block, a swinging seat, a first ball tube, a funnel, a first spring, a launching device, a first strut, a sliding sleeve, a rack, a clamping rod, a third spring and the like; and the stand is mounted on the left side of the top of the support, the stopping block is fixed on the upper portion of the left side surface in the stand, the swinging seat is hinged to the right side of the upper portion of the stand, and the first ball tube capable of launching table tennis balls is arranged on the bottom of the swinging seat. Througha motor, a sector gear rotates clockwise, therefore, the table tennis balls can be launched through the launching device, people do not need to throw out the table tennis balls manually, thus, the labor intensity of people can be reduced, and the training efficiency can be improved; and by regulation of the launching angle of the table tennis balls, the difficulty of training for athletes can be increased.

The invention discloses an automatic cooking machine which comprises a rack. The rack is provided with a cylindrical wok, a side dish mechanism, an ingredient mechanism, an automatic plate feeding mechanism, a PLC and a man-machine interaction panel, wherein the cylindrical wok is provided with a vegetable feeding opening, a vegetable feeding opening closing cover used for opening / closing the vegetable feeding opening, a dish discharging opening, a dish discharging opening closing cover used for opening / closing the dish discharging opening, a feeding opening and a feeding opening closing cover used for opening / closing the feeding opening, the side dish mechanism is used for weighing vegetables and feeds the vegetables to the vegetable feeding opening of the cylindrical wok, the ingredient mechanism is used for storing seasoning and feeding the seasoning to the feeding opening of the cylindrical wok, the automatic plate feeding mechanism is used for providing dinner plates and can convey the dinner plates to the dish discharging opening of the cylindrical wok, the PLC is connected with the cylindrical wok, the plate feeding mechanism, the side dish mechanism and the ingredient mechanism, and the man-machine interaction panel is connected with the PLC. Cooking efficiency is improved by reducing manual links, foodstuff feeding, seasoning, temperature controlling, plate feeding and bailing are carried out fully mechanically and automatically, and the links of manual cooking are reduced to the maximum.

The invention discloses a tennis ball serving device for sports training. The tennis ball serving device comprises a base; a handrail is arranged at one end of the top of the base; a support is arranged at the front end of the handrail; a sleeve is fixed at the top of the support; a sleeve rod is connected to the inner side of the sleeve in a sliding mode; one end of the sleeve rod extends out ofthe sleeve and is connected with a baffle; one end, extending out of the sleeve, of the sleeve rod is sleeved with a first spring; a rack is fixedly mounted at the bottom of the baffle; a protective shell is arranged at the front end of the support; a motor is arranged at the bottom of the inner side of the protective shell; a fixed shaft is arranged at the upper end of the inner side of the protective shell; an incomplete gear is connected to the fixed shaft; the incomplete gear is in meshed connection with the rack; a conical hopper supporting frame is arranged at the front end of the protective shell; a guide pipe is connected to the top of the conical hopper supporting frame; a conical hopper is connected to the top of the guide pipe; and the front end of the guide pipe is connected with a ball serving pipe. The device is simple to operate; an emission angle of a tennis ball can be adjusted, so that the ball is not stuck during ball serving; a large amount of tennis balls can be emitted at one time, so that the ball serving efficiency is improved; and the device has a positive significance for tennis training.

The invention belongs to the technical field of tennis ball sports equipment, and particularly relates to a tennis ball serving device which comprises a ball serving machine and a controller. The controller is installed on the outer side of the ball serving machine, and the controller is used for controlling the device to operate automatically; the ball serving machine comprises a shell, a ball serving launching device, a lifting unit and a ball inlet channel, the upper end of the shell is a slope, one side of the shell is provided with the ball inlet channel, and the lifting unit is located inside the shell; the ball inlet channel is arranged obliquely, and the lower end of the ball inlet channel makes contact with the end of a stretchable cylinder; the lifting unit comprises a stretchable cylinder and a weight sensor; the lifting unit is used for pushing tennis balls in the ball inlet channel out of the shell; the ball serving launching device is located at the upper end face of theshell; table tennis are launched by means of elasticity of a rubber sheet, the tennis ball serving initial speed is increased, a rubber sheet is driven through the sliding shaft to slide in an arc shape, and therefore the tennis serving angle can be regulated and the tennis serving randomness can be enhanced, and the tennis training effect is improved.

The invention discloses an unmanned intelligent restaurant system which comprises a separating device, a pot body assembly, an automatic cooker compounding device, a food receiving device, an empty dish placing frame and a robot. The separating device is used for separately loading food materials into food material boxes, the pot body assembly is arranged at one end of the separating device and used for cooking, the automatic cooker compounding device is arranged above the pot body assembly and used for adding the food materials in the food material boxes into a pot body of the pot body assembly, the food receiving device is arranged on one side of the pot body assembly and used for receiving foot poured out from the pot body assembly, the empty dish placing frame is used for placing emptydishes, and the robot is used for carrying the food material boxes separately loaded with the food materials to the automatic cooker compounding device, delivering the dishes with food on the food receiving device to a table and placing the empty dishes on the empty dish placing frame to the food receiving device. According to the unmanned intelligent restaurant system, automatic material separation and delivery, cooking and delivery can be achieved, unmanned and intelligent restaurants are realized, the structure is simple, the design is reasonable, the food feeding efficiency is greatly improved, and the labor cost is saved.

The invention discloses an anti-blockage tennis ball service device for modern sports. The device comprises a base plate and is characterized in that supporting columns are fixedly arranged at the twosides of the bottom of the base plate, movable wheels are fixedly arranged at the bottoms of the supporting columns, a buffer device is fixedly arranged at the lower end of the middle of the base plate, a ball service groove is fixedly formed in the upper end of the middle of the base plate, a ball service device is fixedly arranged at the upper end of the side, away from the ball service groove,of the base plate, a tennis ball putting opening is fixedly formed in the top of an outer frame, a tennis ball box is fixedly arranged at the lower end of the tennis ball putting opening, a ball shifting device is fixedly arranged in the middle inside the tennis ball box, a second sliding plate is fixedly arranged at the lower end of a first sliding plate, and a ball outlet is fixedly formed in the lower end of the second sliding plate. The invention relates to the technical field of modern sports service. According to the anti-blockage tennis ball service device for modern sports, the tennisball service device cannot generate the blockage phenomenon in the ball service process, and ball service can be continuously, efficiently and stably performed.

The invention provides a meal delivery method and a device, a storage medium and an electronic device. The method comprises the following steps: receiving an instruction for indicating the delivery ofmeals to a target position; scanning bluetooth devices at multiple positions through a Bluetooth device built in the machine device to determine a Bluetooth device at a target position; and triggering the machine device to move to the target position, and sending a prompt tone of food distribution to the Bluetooth device at the target position. According to the method, the problem of high cost caused by the need of a large number of service personnel for serving in related medium and large restaurants is solved, the labor cost is saved, and the serving efficiency is improved.

The invention discloses an intelligent meal delivery system and method. The system comprises at least one kitchen client, at least one meal delivery robot and a server connected with the kitchen client and the meal delivery robot through a network. The kitchen client receives a selection instruction of a dish scriber for prepared dishes and a to-be-delivered dish instruction for distributing the selected dishes to the meal delivery robot, generates dish delivery information according to the selection instruction and the to-be-delivered dish instruction, and uploads the dish delivery information to the server in real time; the server receives and stores the serving information and then transmits the serving information to the designated meal delivery robot; and the meal delivery robot outputs dish serving information for the dish scratching person to confirm, receives the dishes placed after the dish scratching person confirms and the meal delivery instruction, sends out and delivers the dishes to the customers in the store according to the meal delivery instruction, and returns a processing result to the server after dish serving is completed, so that the kitchen dishes are synchronized with the information of the front hall meal delivery robot in real time, the efficiency is improved, and the labor cost is saved.

The invention discloses a noodle cooking device, which relates to the technical field of catering automation and is used for improving the serving efficiency. The noodle cooking device comprises a noodle cooking table, a noodle cooking pot, a pot cover, a driving motor, a bracket, a controller and a plurality of noodle cooking baskets; wherein the noodle cooking pot is arranged on the noodle cooking table, the brackets are arranged above the noodle cooking pot, an installation hole is arranged in the middle of each bracket, the driving motor is arranged on the brackets and connected with the controller, the pot cover is arranged between the noodle cooking pot and the brackets, the rotating shaft of the driving motor is fixedly connected with the pot cover through the installation hole; a plurality of noodle boiling openings are arranged on the pot cover along the circumferential direction, and the noodle boiling baskets are movably arranged in the noodle boiling openings. The device isapplied to automatic cooking noodles.

The invention discloses a badminton serving device, which comprises a substrate, a ball server and a ball guider; the ball server comprises a first driving mechanism fixed on the substrate, a serving pipe driven by the first driving mechanism and rotated at multiple angles, and a pushing mechanism installed in the serving pipe; the serving end of the serving pipe is provided with a serving slot for inserting a badminton; the slot base of the serving slot is provided with a through hole for making a ball base of the badminton cross through; the ball guider comprises a second driving mechanism fixed on the substrate and a telescopic frame driven by the second driving mechanism and arranged with a first station and a second station; when the telescopic frame is located at the first station, the telescopic frame clamps the badminton to be served; when the telescopic frame is located at the second station, the telescopic frame sends the clamped badminton to the serving slot and makes the ball base of the badminton cross through the through hole, so as to make the pushing mechanism push and serve the badminton. The invention further discloses a badminton partner training machine. The badminton serving device and the badminton partner training machine can improve the serving rate and accuracy, and promote the overall serving efficiency.

The invention relates to an efficient ball serving device, in particular to an efficient ball serving device for tennis training. The efficient ball serving device for tennis training achieves the technical purposes that the tennis serving speed is high, tennis balls cannot be clamped during ball serving, the ball serving efficiency is high, and continuous ball serving can be achieved. In order toachieve the technical purposes, the efficient ball serving device for tennis training comprises a base plate, a left supporting plate and the like; a driving device is arranged above the base plate,a transverse plate is arranged on the top of the driving device, a first push rod is arranged on the left side of the top of the transverse plate, the left supporting plate is arranged on the left side of the top of the base plate, and a first track is arranged on the top of the left supporting plate. The effects that the tennis ball serving speed is high, tennis balls cannot be clamped during ball serving, the ball serving efficiency is high, and continuous ball serving can be achieved are achieved, the driving device drives the first push rod to move leftwards, a movable device drives the first push rod to move upwards, and therefore the first push rod can push tennis balls to move forwards.

The invention discloses a ball serving machine for football training. The ball serving machine comprises a rack, a steering device arranged on the rack and used for adjusting the shooting direction of football bodies, a football shooting device arranged on the steering device and used for continuously shooting the multiple football bodies, and a football guiding device used for guiding the football bodies to be shot to the football shooting device and used for adjusting the shooting dip angles of the football bodies; the football shooting device comprises a shooting head used for making contact with the football bodies, a driving mechanism used for controlling the shooting head to do reciprocating linear motion and a shooting executing mechanism used for applying thrust to the shooting head. According to the ball serving machine for football training, the multiple football bodies can be continuously served, automatic ball serving and conveying are achieved, the ball serving efficiency is improved, the training efficiency of a user is effectively improved, the football bodies can be served to different positions according to the requirements of the user, and great convenience is provided for the user.

The invention relates to an efficient ball serving device, in particular to an efficient ball serving device for tennis training. The efficient ball serving device for tennis training achieves the technical purposes that the tennis serving speed is high, tennis balls cannot be clamped during ball serving, the ball serving efficiency is high, and continuous ball serving can be achieved. In order toachieve the technical purposes, the efficient ball serving device for tennis training comprises a base plate, a left supporting plate and the like; a driving device is arranged above the base plate,a transverse plate is arranged on the top of the driving device, a first push rod is arranged on the left side of the top of the transverse plate, the left supporting plate is arranged on the left side of the top of the base plate, and a first track is arranged on the top of the left supporting plate. The effects that the tennis ball serving speed is high, tennis balls cannot be clamped during ball serving, the ball serving efficiency is high, and continuous ball serving can be achieved are achieved, the driving device drives the first push rod to move leftwards, a movable device drives the first push rod to move upwards, and therefore the first push rod can push tennis balls to move forwards.

The invention belongs to the technical field of catering service meal transfer, and particularly relates to a manual circulating meal transfer device. A braking mechanism, a closed conveying track anda frame for supporting the conveying track are included. The conveying track is in sliding connection with a plurality of meal transfer pots distributed around the conveying track, and the adjacent meal transfer pots can be in contact. The braking mechanism is used for making the meal transfer pots stop moving. The manual circulating meal transfer device in the scheme is simple in structure, theconveying track, the frame, the meal transfer pots and the braking mechanism are arranged, installing is convenient, in addition, the integral cost is low, in the later usage process, the manual circulating meal transfer device can be constantly used as long as the meal transfer pots can normally move and the braking mechanism can normally work, the maintaining cost is low, and the manual circulating meal transfer device is suitable for being used and popularized in massive eateries.

The invention discloses an automatic dish conveying machine. The automatic dish conveying machine comprises a frame, wherein the frame comprises an X-axis optical axis, a Y-axis optical axis and a bracket; the bracket comprises a bottom plate, a top plate, an X-axis sliding sleeve and a Y-axis sliding sleeve; the X-axis optical axis is sleeved with the X-axis sliding sleeve in a sliding manner. According to the automatic dish conveying machine, the bracket and the Y-axis optical axis are driven to move through motors at left and right sides; a balancing weight and a connecting seat are connected with two ends of the Y-axis optical axis respectively; the connecting seat is connected with a dish box through a vertical guide rod; a hoisting driver is connected between the connecting seat andthe dish box. According to the automatic dish conveying machine disclosed by the invention, power in X-axis and Y-axis directions is arranged in the X-axis optical axis direction, so that the problemthat potential safety hazards are caused when the weight is too heavy in the Y-axis optical axis direction is avoided; meanwhile, dish serving is not influenced by activity conditions of people, the dish serving efficiency is improved and the time is saved.

An apparatus for launching balls for sports practice comprising a tank (2) for housing a pressurised gaseous fluid, connected by means of an exhaust duct (5) to a launch tube (3) whose section substantially corresponds to that of a ball (4) to be launched, and which has a seat (8) for positioning the ball (4). A rapid opening device (6) allows to discharge on command the fluid from the tank (2) to the launch tube (3) through the exhaust duct (5), in order to cause the launch of the ball (4). The apparatus (1) further comprises throttling means (37) mounted in the exhaust duct (5) to determine the transfer of the fluid from the tank (2) to the launch tube (3), as well as means (43) for varying the position of the seat (8) for the ball (4) to be launched, which can be operatively associated to each other to vary the position of the seat (8) according to the regulation of the transfer of the fluid from the tank (2) to the launch tube (3) and vice versa, according to a pre-determined relationship.

The invention discloses table tennis exercise equipment. First vertical rods mounted on a table tennis tabletop are arranged on the outer sides of positions, which are placed at two ends of a tennis net, on a fixing frame; the outer walls of the first vertical rods are connected with ball stop nets in a sleeving manner; the other ends of the ball stop nets are connected to the outer walls of second vertical rods in a sleeving manner; a ball stop net is arranged between every two adjacent groups of second vertical rods; an inclined ball conveying pipe covers the outer wall of the left side of the table tennis tabletop and comprises a first inclined pipe and a second inclined pipe; the outer walls of the first vertical rods and the second vertical rods are respectively connected with both ends of the first inclined pipe; the outer walls of the second vertical rods are connected with one end of the second inclined pipe, and the other end of the second inclined pipe is plugged into an inner cavity of a ball collection trough; and a lifting air pump is mounted at the bottom of the ball collection trough. The table tennis exercise equipment is easy to operate and can control the ball serving direction, so that an athlete can do exercises conveniently; and meanwhile, served balls can be recycled, and the ball serving efficiency is improved.

The invention discloses a tennis serving and picking all-in-one machine. The all-in-one machine comprises a machine box, wherein a base is arranged at the bottom of the machine box, and a tennis ball detecting assembly and a serving hole are arranged on the machine box; a walking assembly, which is rotationally connected with the base; a ball picking assembly, which is rotationally connected to the interior of the machine box, wherein one side of the ball picking assembly communicates with a ball passing plate; a ball storage assembly, which comprises a ball collecting basket, a rotating disc motor, a rotating ball disc and a ball inlet pipe, wherein the ball collecting basket is fixed in the machine box and communicates with the other end of the ball passing plate, the ball inlet pipe communicates with the bottom of the ball collecting basket, the rotating ball disc is rotationally connected to the inner wall of the bottom of the ball collecting basket, a ball leaking hole is formed in the rotating ball disc, and the rotating disc motor is in transmission connection with the rotating ball disc; a serving assembly, which is rotationally connected into the machine box, wherein one end of the serving assembly is arranged opposite to the ball inlet pipe, and the other end of the serving assembly is arranged opposite to the serving hole; and a control assembly, which is fixed to the top wall of the machine box and electrically connected with the tennis ball detecting assembly, the walking assembly, the ball picking assembly, the rotary disc motor and the serving assembly.

The invention discloses a multi-angle adjustable ball serving method for sports equipment. The method is by comprising the following steps: (1) S1, a propelling cylinder moves forwards to a self-spinning station of a spinning adjusting module, and when the propelling cylinder moves backwards, a ball hitting rod compresses a force storage spring to realize energy storage; (2) S2, the two ends of aball located at the spinning station are tightly pressed by a rotating pressing rod of the spinning adjusting module, then the propelling cylinder slightly moves backwards to prevent the ball from making contact with the outer wall of the ball, and the rotating pressing rod drives the ball to achieve spinning; and (3) S3, blocking of the ball hitting rod is relieved, and then the ball with spinning is rapidly impacted by the ball hitting rod. Impact ball serving is achieved through a ball serving device, and ball spinning is achieved through the spinning adjusting module before impact, so thespinning balls can be sent out, the actual training requirement is met, and players can be trained to respond to strategies and actions of the spinning balls in time.

The invention belongs to the technical field of sports equipment, and particularly relates to an automatic ball launcher. The automatic ball launcher comprises a ball box, a corner bracket, a slappingboard, a French curve, a pressure stem, an angle pole and a hydraulic cylinder. One end of the angle pole is rotatably connected with an output shaft of the hydraulic cylinder, and the other end of the angle pole is fixedly connected with the pressure stem. The corner bracket is rotatably connected with the side wall of the ball box. The corner bracket comprises a first pole and a second pole, the free end of the first pole is connected to the inertial component which can allow the corner bracket to be rotated, the body of the second pole is slidably contacted with the free end of the cornerbracket. A C-shaped inner arc surface is arranged on the French curve, the inner arc surface is slidably contacted with the free end of the second pole, and the bottom of the French curve is fixedly connected with the slapping board. A pitching mouth is arranged on the top of the ball box, and an outlet is arranged at the bottom of the French curve. The slapping board is located below the outlet and rotatably connected with the bottom of the ball box. According to the technical scheme, the automatic ball launcher can increase the bouncing strength of the table tennis ball and reduce the invalid ball.

The invention belongs to the technical field of tennis teaching, in particular to a tennis teaching training method. A tennis servicing device comprises a serving machine and a controller, the controller is installed on the outer side of the servicing machine, the controller is used for controlling the automatic operation of the device, the servicing machine comprises a housing, a servicing ejecting device, a lifting and lowering unit and a ball inlet passage, the upper end of the housing is an oblique surface, one side of the housing is provided with the ball inlet passage, and the lifting and lowering unit is located in the housing; the ball inlet passage is obliquely arranged, and the lower end of the ball inlet passage is in contact with the end of a telescopic cylinder; the lifting and lowering unit comprises the telescopic cylinder and a gravitational force sensor, the lifting and lowering unit is used for pushing a tennis ball in the ball inlet passage out of the housing, and the servicing ejecting device is located on the upper end face of the housing. By performing accurate analysis on collected information in the training process through a computer, the movement and pat holding posture of a learner is targetedly guided, and therefore tennis teaching efficiency is improved.

The invention discloses a multi-angle adjustable serving method for sports equipment, which is characterized in that it comprises the following steps: (1) Step S1, the push cylinder moves forward to the spin station of the spin adjustment module, and the push cylinder moves backward During the process, the batting rod compresses the energy storage spring to realize energy storage. (2) Step S2, the two ends of the ball located at the spin station are compressed by the rotation pressure rod of the spin adjustment module, and then the push cylinder moves backward slightly , to avoid contact with the outer wall of the ball, rotate the pressing bar to drive the ball to spin, (3) step S3, remove the blocking of the batting stick, and then the ball with spin is quickly hit by the batting stick. The invention realizes impact serving through the ball serving device, and realizes the spin of the ball through the spin adjustment module before the impact, so that the spin ball can be sent out, which meets the actual training requirements, and can train the player's timely response strategy and action to the spin ball.

The invention discloses a rotary stove and a rotating method thereof, belonging to the technical field of stoves. Wherein, the rotary cooktop includes: a support mechanism, a cooktop main body and a driving mechanism, the support mechanism includes a support platform and a bracket, and the support platform has a plurality of supporting flame holes; the cooktop main body includes a cooktop plate, The hearth and the support ring, the cooktop plate has a plurality of cooktop flame holes corresponding to the supporting flame holes, and the cooktop plate can rotate around its own axis; the driving mechanism includes a driving motor and a transmission mechanism. The driving mechanism can drive the stove top plate to rotate. Compared with the prior art, the rotary stove proposed by the present invention can reduce the time for the chef to wash the pot, dry the pot body and warm the oil in the process of cooking dishes, improve the efficiency of the chef's cooking dishes, and further improve the serving time of restaurants. efficiency.

The invention discloses an automatic vegetable transfer system of an automatic vegetable transfer machine, comprising a control module and an automatic vegetable transfer device, the control module is connected to the automatic vegetable transfer device, the automatic vegetable transfer device includes a frame, the frame includes an X-axis optical axis, Y-axis optical axis, bracket, counterweight, connecting seat, vertical guide rod, dish box, lifting drive, left and right side motors, first belt and second belt. The vegetable delivery machine system controls the delivery of vegetables through the control module, which will not affect the serving of dishes due to people's activities, improves the efficiency of serving dishes, and saves time.

The invention discloses an automatic ball serving machine. The automatic ball serving machine comprises a ball collecting mechanism, a vibration disc, a chain conveying mechanism, a ball loosening mechanism and a ball serving mechanism which are sequentially arranged. By means of the ball collecting mechanism, the chain conveying mechanism and the ball loosening mechanism, the ball collecting function, the conveying function and the ball loosening function of the machine can be achieved, the ball serving efficiency of the automatic ball serving machine is greatly improved, the workload is reduced and the automation application range is wider.

The invention discloses an automatic dish delivering system of an automatic dish delivering machine. The automatic dish delivering system comprises a control module and an automatic dish delivering device, the control module is connected with the automatic dish delivering device, the automatic dish delivering device comprises a frame, and the frame comprises X-axis polished shafts, Y-axis polishedshafts, a support, a balancing weight, a connecting base, a vertical guide rod, a dish box, a lifting drive, left and right motors, a first belt and a second belt. According to the system, dish delivering is controlled through the control module, dish serving is not affected by the activity situation of people, the dish serving efficiency is improved, and time is saved.

The invention discloses a ball shooting device for tennis training. The ball shooting device comprises an outer shell body, universal wheels, a round groove body, a rotating plate, an end cover, a motor, a connecting hole, a clamping piece, an exhaust hole, a fixed base, a gas spraying opening, a gas conveying channel, an exhaust machine, a connecting pipe and an exhaust groove. The ball shootingdevice is reasonable and simple in structure, low in production cost, convenient to install and complete in function; the motor is a stepping motor, and therefore the precise programming control can be conveniently conducted through an existing control technology, it is ensured that the rotating plate can indirectly rotate by 90 degrees anticlockwise, it is ensured that tennis balls can be intermittently filled and shot, and the ball shooting efficiency is improved; the exhaust machine can vacuumize the exhaust groove, when the connecting hole is located on the upper side, the exhaust hole onthe side face can be communicated with the interior of the exhaust groove, and therefore the tennis balls can be sucked into a ball-shaped clamping groove, and the tennis ball filling speed and quality are greatly improved.

A table tennis cuff bag of the present invention comprises an outer shell and an inner shell with a closed upper end, a locking tooth is arranged in the inner shell, a spring three is arranged inside the locking tooth, telescopic teeth are arranged at both ends of the locking tooth, and the telescopic teeth can be Under the action of the spring three, the teeth are protruded out, and the side wall of the inner shell is evenly distributed with a number of slots. The telescopic teeth can be inserted into the slots to limit the movement of the teeth in the inner shell. There is a drive card between the top of the inner shell and the teeth. The second spring for tooth movement, the lower end of the inner shell is provided with an elastic catch for blocking the table tennis ball; a telescopic sleeve is also arranged between the outer shell and the inner shell, and the top of the telescopic sleeve is provided with a drive to drive it on the outer shell. Spring 1 slides in the center, and the inner wall of the telescopic sleeve is evenly distributed with a number of pushing teeth; the side of the telescopic teeth facing spring 1 is provided with a slope, and the lower end of the telescopic sleeve protrudes from the shell and is provided with a trigger. The invention not only solves the problem of excessive physical exertion of the human body, but also brings convenience to serving.