Table tennis ball collecting and processing method for training
Technical Field
The invention belongs to the technical field of sports equipment, and particularly relates to a table tennis ball collecting and processing method for training.
Background
When the athletes do table tennis training, a large amount of table tennis balls are used. The table tennis is scattered on the training ground and needs to be collected for reuse. At present, the adopted method mainly comprises manual bare-handed picking or broom collection, the manual bare-handed picking needs frequent stooping and knee bending, the defects of high labor intensity and low efficiency exist, and table tennis balls collected by the broom can have a large amount of dust. Meanwhile, after the used table tennis is hit by the racket for many times, the surface of the used table tennis is likely to have sunken and deformed defective goods, so that the elasticity of the table tennis is changed, the speed and the rotation of the table tennis are greatly changed in the training, and the training result is influenced.
Although there is a table tennis ball picker without frequently bending down and bending knees, for example, the chinese utility model patent entitled "table tennis ball picker" with the publication number of CN201356411Y discloses that a spring is respectively arranged on both sides of a table tennis ball mouth at the lower part of the table tennis ball picker, when the ball picking mouth is aligned with a table tennis ball, due to the elasticity of the spring, the table tennis ball pulls the spring open towards both sides, the table tennis ball enters a ball storage cylinder, and the spring restores to the original state to block the table tennis ball, so that the table tennis ball cannot fall off. Although the ball picking device can solve the problem of frequent bending and bending knees, the ball picking device can only pick up the table tennis at the close position when picking up the table tennis, and can only pick up the table tennis by vertically aligning the table tennis, thereby causing unnecessary troubles.
In order to pick up table tennis balls in a large range, the invention discloses a Chinese invention patent with an authorized bulletin number CN102397686B, namely a table tennis ball picking and collecting vehicle, wherein a steel wire rope is pulled by one end of a handle which grips a control rod, so that a ball picking plate rotates fast in a fixed axis mode, and the table tennis balls in a ball picking area are impacted, so that the table tennis balls roll into a collecting bin to pick up the table tennis balls.
In view of the above, it is desirable to provide a method for collecting and processing table tennis balls for training, which can automatically pick up table tennis balls, effectively remove dust and impurities from the table tennis balls, and screen defective products.
Disclosure of Invention
The invention aims to provide a table tennis ball collecting and processing method for training, which can realize automatic table tennis ball picking, effectively remove dust and sundries on table tennis balls and screen defective products.
The above purpose is realized by the following technical scheme: a training table tennis ball collecting and processing method comprises the following steps:
(1) picking up: picking up scattered table tennis;
(2) collecting: collecting the table tennis balls picked up in the step (1);
(3) washing with water: putting the table tennis balls collected in the step (2) into a washing mechanism for washing and then draining for a preset time;
(4) cleaning: dedusting and dewatering the table tennis balls treated in the step (3) in a dewatering and dedusting mechanism;
(5) screening: placing the table tennis balls treated in the step (4) in a screening mechanism for screening;
wherein, the dewatering and dust removing mechanism comprises a transmission mechanism, the screening mechanism comprises a speed reducing plate, one end of the speed reducing plate is close to the transmission mechanism, the other end of the speed reducing plate is provided with a bouncing assembly, the bouncing assembly comprises a bouncing plate, the bouncing plate is arranged below the speed reducing plate, the periphery of the bouncing plate is provided with a surrounding plate, the upper end of one side of the surrounding plate far away from the transmission mechanism is provided with a preferred channel, one end of the preferred channel is fixed on the surrounding plate, the other end of the preferred channel is a free end, the speed reducing plate is provided with a blower, the air outlet end of the blower is opposite to the preferred channel, the lower end of the surrounding plate far away from the transmission mechanism is provided with a defective product channel, one end of the defective product channel is fixedly arranged on the bouncing plate, the other end of the defective product channel is a free end, and the tail end of the speed reducing plate is provided with a mixing channel, the width of the mixing channel is matched with the diameter of a table tennis ball, the tail end of the mixing channel is provided with a bounce opening, the table tennis ball falls onto the bounce board from the bounce opening, and the height difference between the bounce board and the optimal channel is a preset value; the table tennis balls subjected to dust removal and water removal in the step (4) fall onto the speed reducing plate to continue rolling, the table tennis balls roll to the tail end of the speed reducing plate and enter the mixing channel, the mixing channel can only contain one table tennis ball, the horizontal speed of the table tennis balls is close to zero when the table tennis balls roll to the bounce opening due to the friction force of the speed reducing plate, the table tennis balls fall onto the bounce plate from the bounce opening and are bounced by the bounce plate, the bounced height of the table tennis balls without deformation and damage is greater than or equal to the height difference between the bounce plate and the preferred channel, the blower is started, the intact table tennis balls bounce out from the bounce opening and are blown into the preferred channel by the blower to roll out and are collected, and the bounced height of the table tennis balls with deformation and damage is lower than the height difference between the bounce plate and the preferred channel due to the action of gravity, and finally stopping the table tennis balls subjected to deformation in the enclosing plates, rolling out from the defective product channel and collecting the table tennis balls, so that the collection and classification of the table tennis balls after training are completed.
The further technical scheme is that a picking mechanism is adopted to pick scattered table tennis balls in the step (1), the picking mechanism comprises a bottom plate, push handles are symmetrically arranged at the bottom of the rear end of the bottom plate, push rods are symmetrically arranged between the top ends of the push handles, universal wheels are symmetrically arranged at the bottom of the push handles, a collecting frame is arranged at the front part of the bottom plate, an opening is arranged at the front end of the collecting frame, a box bottom is arranged at the bottom of the collecting frame, the front end of the box bottom is hinged with the collecting frame, an electric push rod A is arranged at the rear end of the box bottom, a push rod seat of the electric push rod A is fixedly connected with the bottom of the bottom plate, a piston rod of the electric push rod A is abutted against the box bottom, a connecting rod mechanism is arranged at the bottom of the bottom plate and is used for gathering the scattered table tennis balls to the collecting frame, and the collecting mechanism is arranged at the upper part of the bottom plate, the collecting mechanism collects the table tennis balls at the collecting frame into the collecting frame; the connecting rod mechanism comprises a first stirring part and a second stirring part which are symmetrically arranged, the first stirring part and the second stirring part have the same structure, the first stirring part comprises a stirring rod which is connected with the pivot of the bottom plate, an ear plate is arranged on the stirring rod, a first connecting rod is arranged on the ear plate, a Y-shaped seat is arranged on the bottom plate and comprises a vertical part and two bifurcate parts, the vertical part is connected with the pivot of the bottom plate, one end of the first connecting rod is connected with the pivot of the ear plate, the other end of the first connecting rod is connected with one of the bifurcate parts of the Y-shaped seat, the other bifurcate part of the Y-shaped seat is provided with a second connecting rod, one end of the second connecting rod is connected with the bifurcate part of the Y-shaped seat, the other end of the second connecting rod is provided with an electric push rod B, and the push rod seat of the electric push rod B is fixedly connected with the bottom plate, a piston rod of the electric push rod B is connected with the second connecting rod through a pivot, and the collecting frame is arranged between the poke rods of the first poke part and the second poke part; and (2) in the step (1), the poke rod is opened to be in an initial state, the push rod is pushed, the picking mechanism is enabled to move to the ping-pong ball scattering place until the two opened poke rods are filled with ping-pong balls, then the electric push rod B is started, the electric push rod B drives the poke rod to be closed through the connecting rod II, the Y-shaped seat and the connecting rod I, the electric push rod B is closed, and the ping-pong balls are gathered between the poke rod and the collecting frame.
The further technical scheme is that a collecting mechanism is adopted to collect the picked table tennis balls in the step (2), the collecting mechanism comprises a fixing plate, a first shaft hole is formed in the front end of the fixing plate, a blocking nail is arranged at the rear end of the fixing plate, one end of the blocking nail is fixedly connected with the fixing plate, a baffle plate is arranged at the other end of the blocking nail, a pulling part is movably arranged on the fixing plate and comprises a body, the body comprises a rear end part, a middle part and a front end part, a strip hole is formed in the rear end part of the body and is arranged on the blocking nail, a waist hole is formed in the middle part of the body, a limiting plate is arranged on one side of the body provided with the waist hole, a limiting hole is formed in the limiting plate, a cam is arranged between the body and the limiting plate, a bulge is arranged at one end of the cam, and is arranged in the limiting hole, a second shaft hole is formed in the middle of the cam, a rotating shaft is arranged in the waist hole and is tangent to the contour line of the waist hole, the rotating shaft penetrates through the waist hole, one end of the rotating shaft is arranged in the second shaft hole, the other end of the rotating shaft penetrates through the shaft hole and extends towards the outer side of the fixed plate to form a first extending part, a motor A is arranged at the first extending part, the motor A is fixedly connected with the fixed plate, a hook body is arranged at the front end part of the body, a groove is formed in the bottom plate close to the collecting frame, the fixed plate is arranged in the groove, an electric push rod C is arranged in the groove, a push rod seat of the electric push rod C is fixedly connected with the side wall of the groove, and a piston rod of the electric push rod C is fixedly connected with the fixed plate; and (3) starting the motor A in the step (2), rotating an output shaft of the motor A to drive a rotating shaft to rotate, enabling the front end part of the pulling part to generate lifting motion through the waist hole, ensuring that the pulling part does linear motion through the strip hole, collecting table tennis balls at the front end of the collecting frame into the collecting frame by the pulling part, starting the electric push rod C, pushing the collecting mechanism to do linear motion along the collecting frame by the electric push rod C until the table tennis balls between the complete poking rods are collected, and closing the electric push rod C.
A further technical scheme is that in the step (3), collected table tennis balls are conveyed to the upper side of the washing mechanism through a conveying mechanism and are thrown into the washing mechanism, the conveying mechanism comprises an input end and an output end, the input end of the conveying mechanism is provided with a collecting mechanism, the collecting frame is arranged on the upper side of the input end of the conveying mechanism, the conveying mechanism is a slope conveyor, the input end of the conveying mechanism is lower than the output end of the conveying mechanism, in the step (3), a push rod is pushed, the collecting frame of the picking mechanism is arranged on the upper portion of the input end of the conveying mechanism, an electric push rod A is started to force the box bottom to leave the collecting frame to form a gap, the table tennis balls roll down on the input end of the conveying mechanism from the gap, the electric push rod A is closed, and the box bottom is completely attached to the collecting frame; and then starting the conveying mechanism, moving the table tennis balls from the input end of the conveying mechanism to the output end of the conveying mechanism, dropping the table tennis balls into the washing mechanism, closing the conveying mechanism, and stopping the conveying mechanism.
The further technical scheme is that the conveying mechanism is a apron conveyor or a groove conveyor with flanges.
The further technical scheme is that the washing mechanism comprises a washing pool, a first telescopic piece, a cleaning brush and a draining basin arranged at the tail end of the washing pool, the relatively-arranged side wall of the washing pool is provided with a guide groove horizontally arranged, the guide groove extends to the tail end of the washing pool, the cleaning brush comprises a guide rod and bristles arranged on the guide rod, the guide rod is connected in a penetrating manner, two opposite side walls are provided with the guide groove, the fixed end of the first telescopic piece is fixed on the side wall of the washing pool, the telescopic end is connected with the guide rod, the first telescopic piece is used for driving the cleaning brush to move along the guide groove, the bottom of the draining basin is provided with a plurality of water leakage holes, the first side plate of the draining basin is provided with a second telescopic piece, the fixed end of the second telescopic piece is fixedly connected with the first side plate, the draining basin comprises a water leakage plate at the bottom and a first side plate and a second side plate which are relatively arranged, one end of the water leakage plate is hinged with a second side plate which is arranged opposite to the first side plate, the other end of the water leakage plate is connected with the movable end of a second telescopic piece, the second telescopic piece is telescopic and used for driving the water leakage plate of the draining basin to rotate along the hinged point of the water leakage plate and the second side plate so as to realize the opening and closing of the water leakage plate, the water leakage plate is provided with a guide connection plate, and the tail end of the guide connection plate is positioned above the water and dust removing mechanism; step (3) in the table tennis ball that conveying mechanism falls into in the washing pond float at the surface of water, the extension of the first extensible member of control, the drive the cleaning brush removes to the direction of driping the basin, the brush hair moves the table tennis ball and rolls until all table tennis balls fall into to the direction of driping the basin in the driping basin, start the second extensible member after the scheduled time, force the bottom plate rotation of driping the basin, the bottom plate is opened and shut, and the table tennis ball of collection changes over to after on the fishplate bar from the opening part roll over to in the dewatering dust removal mechanism.
The technical scheme is that the dewatering and dedusting mechanism comprises a receiving plate, the receiving plate is used for receiving table tennis balls output from the guide plate, a turnover mechanism and a lifting mechanism are arranged on one side, away from the washing mechanism, of the receiving plate, the turnover mechanism is arranged between the receiving plate and the lifting mechanism, the turnover mechanism enables the table tennis balls on the receiving plate to be turned over to the lifting mechanism, a transmission mechanism is arranged on one side of the lifting mechanism, the transmission mechanism is arranged on the upper side of the turnover mechanism, and the lifting mechanism enables the table tennis balls to be lifted to the transmission mechanism.
The technical scheme is that the screening mechanism is arranged at a position close to the water and dust removing mechanism, the screening mechanism is arranged at the upper side of the output end of the conveying mechanism, and the table tennis balls are transmitted to the screening mechanism through rotation of the transmission mechanism.
The further technical scheme is that the receiving plate comprises an upper plate and supporting legs A arranged at the bottom of the upper plate, the upper plate is provided with comb teeth A in a linear array manner, the tail ends of the comb teeth A are provided with tooth edges bent upwards, two sides of the upper plate are symmetrically provided with guard plates, the guard plates are arranged on two sides of the comb teeth A, the turnover mechanism comprises a rack arranged symmetrically, a belt vertical seat bearing A is arranged on the rack, a main shaft is arranged in the belt vertical seat bearing A, a rotating roller is arranged on the main shaft, the main shaft is arranged in the rotating roller in a penetrating manner, one end of the main shaft extends towards the outer side of the belt vertical seat bearing A to form a second extending part, a motor B is arranged at the second extending part, the rotating roller is a cylinder, the outer side of the cylinder of the rotating roller is provided with a U-shaped groove, one side of the U-shaped groove is provided with comb teeth B, a gap A is formed between the adjacent comb teeth A, the width of the comb teeth B is equal to that of the gap A, the lifting mechanism comprises a substrate, guide rods are symmetrically arranged on the substrate, a lead screw is arranged on the substrate, a motor C is arranged at the bottom of the lead screw, an output shaft of the motor C is connected with one end of the lead screw, a lifting part is arranged on the lead screw and comprises a transverse comb tooth part and a vertical comb tooth part, a through hole is formed at the joint of the transverse comb tooth part and the vertical comb tooth part, the lead screw is arranged in the through hole, internal threads corresponding to external threads of the lead screw are arranged in the through hole, guide holes are arranged on two sides of the through hole, the guide rods are arranged in the guide holes, the transmission mechanism comprises a symmetrically arranged support, a bearing B with a vertical seat is arranged on the support, and a rolling shaft is arranged in the bearing B with the vertical seat, the roller is provided with a transmission part, the transmission part comprises a hollow cylinder, comb teeth C are arranged on the circumference array of the outer side of the hollow cylinder, the comb teeth C comprise a main rod part and a hook body part, the hook body part is arranged at the tail end of the main rod part, gaps B are formed between the adjacent vertical comb tooth parts and between the adjacent horizontal comb tooth parts, the widths of the main rod part and the hook body part are equal to the width of the gap B, the roller penetrates through the hollow cylinder, one end of the roller extends to the outer side of the bearing B with the vertical seat to form a third extending part, a motor D is arranged at the third extending part, a lap plate is arranged between the turnover mechanism and the lifting mechanism, and the lap plate is arranged on the lower side of the support; in the step (4), firstly, the motor C is started, the height of the transverse comb tooth part of the lifting part is ensured to be equal to that of the lapping plate, the motor C is closed, then the motor B is started again, the motor B drives the main shaft to rotate, the main shaft rotates to drive the rotating roller to rotate, the comb teeth B are arranged in the gap A, table tennis balls on the comb teeth A are lifted by the comb teeth B along with the rotation of the rotating roller and roll down in the U-shaped groove in the lifting process, the motor B is kept to rotate continuously until all the table tennis balls in the U-shaped groove roll down on the lapping plate, the motor B is closed, the motor C is restarted after all the table tennis balls roll down on the transverse comb tooth part from the lapping plate, the table tennis balls are lifted to a proper height, the motor C is closed, the motor D is restarted, the main rod part is arranged in the gap B, the table tennis balls on the transverse comb tooth part are lifted, the table tennis balls are kept to enter the hook body part, and the motor D is kept to rotate continuously, until the table tennis ball of the hook body part rolls down to the speed reducing plate, residual water drops and other attachments on the table tennis ball are removed through multiple times of overturning.
The further technical scheme is that flexible brushes are arranged on the side portions of the comb teeth A, the comb teeth B and the comb teeth C and are located in gaps among the comb teeth. So set up, flexible brush plays the effect of cleaning and brushing in table tennis transportation process, and water, dust and impurity in the table tennis of collection are clear away totally.
The further technical scheme is that the horizontal distance from one end of the speed reducing plate close to the transmission mechanism to the hollow cylinder of the transmission part is smaller than the length of the main rod part.
The technical scheme is that comb teeth D are arranged on the speed reducing plate, a gap C is formed between every two adjacent comb teeth D, the width of the main rod portion is equal to that of the gap C, protection plates are arranged on two sides of the speed reducing plate and are arranged on two sides of the comb teeth D, the springboard is arranged in an inclined mode, the height of one side close to the speed reducing plate is larger than that of one side far away from the speed reducing plate, the height of the optimal channel relative to the ground is lower than that of the mixing channel relative to the ground, and the defective channel is arranged below the optimal channel and is parallel to the optimal channel in direction.
Compared with the prior art, the invention has the beneficial effects that:
1. conveying mechanism is the slope conveyer, and conveying mechanism's input has the effect of accepting, and conveying mechanism has the effect of transmission, promotes the eminence from ground through conveying mechanism with the table tennis, lays a good foundation for next step's dust removal, and pickup mechanism picks up the table tennis of scattering in the bottom surface, has solved the drawback of bending over and bending the knee and pick up to pickup mechanism passes through opening and shutting of electric putter B control poker rod, has solved the low technical problem of manual control pickup mechanism work efficiency. Dust removal mechanism passes through tilting mechanism and transfer mechanism's secondary upset, can clear away the dust in the table tennis of collecting, and screening mechanism is used for classifying the table tennis of excellent, prevents to use the wastrel to influence the training quality.
2. The kinematic pairs in the link mechanism are all low pairs, and two frameworks forming the motion are in surface contact, so that the bearing pressure is small, the lubrication is convenient, the abrasion is light, and the large load can be borne. When the poke rods are opened, scattered table tennis balls can be collected, the push rods are pushed, the table tennis balls are pushed between the two poke rods and gathered at the collecting frame, and when the poke rods are closed, the table tennis balls entering between the poke rods are prevented from rolling out. The connecting rod mechanism controls the opening and closing of the connecting rod mechanism through the electric push rod B, and the working efficiency is high.
3. The collecting mechanism is controlled by a motor A, the pulling part has two working states relative to the fixed plate, one is the working state of lifting and lowering, the other is the working state of horizontally extending and shortening, and the collecting device moves in the groove, so that the collecting range is enlarged.
4. Washing mechanism is through the extension of the first extensible member of control, drive the cleaning brush removes to the direction of driping the basin, and the brush hair brush moves the table tennis and accomplishes the washing to the direction of driping the basin rolls, can effectively wash the attachment on the table tennis.
5. The receiving board is used for receiving the table tennis that conveying mechanism carried, the last tooth edge of broach A prevents with the backplate that the table tennis from rolling, tilting mechanism removes the table tennis from the receiving board to the lapping plate on, realize the first upset of table tennis, hoist mechanism is used for promoting the table tennis to suitable height, again through the second upset of transfer mechanism realization table tennis, through twice upset, water droplet, dust and impurity in the table tennis of collection are clear away totally.
6. The speed reduction plate is used for reducing the rolling speed of table tennis balls, the speed is about zero when the table tennis balls reach the tail end of the speed reduction plate as far as possible, the purpose is to keep the table tennis balls to do free-fall movement, the mixing channel is used for containing the preferred table tennis balls and the deformed table tennis balls, and the blower has the function of blowing air and is used for screening the preferred table tennis balls. The preferred channel and the defective channel are used for conveying preferred table tennis balls and deformed table tennis balls respectively.
7. The invention solves the problem that the table tennis is picked up manually and needs to be stood down and knees are bent, can efficiently collect the table tennis, can remove dust and impurities in the collected table tennis, and can sieve out the deformed table tennis, thereby improving the training quality.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural view of a table tennis ball collecting and processing device according to an embodiment of the present invention.
Fig. 2 is a schematic configuration diagram of a conveyance mechanism according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the combination of the picking mechanism, the collecting mechanism and the conveying mechanism.
Fig. 4 is a schematic view of an orientation structure in which the pick-up mechanism is integrated with the collection mechanism.
Fig. 5 is a schematic structural view of the link mechanism.
Fig. 6 is a schematic structural view of the collecting mechanism.
Fig. 7 is a schematic structural view of the fixing plate.
Fig. 8 is a schematic structural view of the pulling part.
Fig. 9 is a schematic view of another orientation of the integration of the pick-up mechanism and the collection mechanism.
Fig. 10 is a schematic structural view of water removal and dust removal according to an embodiment of the present invention.
Fig. 11 is a mechanism schematic diagram of another view angle of the water and dust removing mechanism in fig. 10.
Fig. 12 is a schematic view of the structure of the receiving plate.
Fig. 13 is a schematic view of the structure of the receiving plate cooperating with the turnover mechanism.
Fig. 14 is a schematic structural view of the roller.
Fig. 15 is a schematic view of the receiving plate, the turnover mechanism and the lifting mechanism.
Fig. 16 is a schematic structural view of the transfer mechanism in the dust removing mechanism.
Fig. 17 and 18 are schematic structural diagrams of different viewing angles of the screening mechanism respectively.
Fig. 19 is a schematic structural view of the water washing mechanism.
Fig. 20 is a schematic structural view of a draining basin.
Wherein the reference numerals are: 1. a conveying mechanism; 2. a pickup mechanism; 21. a base plate; 22. a push handle; 23. a push rod; 24. a universal wheel; 25. a collection frame; 26. the box bottom; 27. an electric push rod A; 28. a link mechanism; 281. poking one part; 2811. a poke rod; 2812. an ear plate; 282. poking the second part; 283. a first connecting rod; 284. a Y-shaped seat; 285. a second connecting rod; 286. an electric push rod B; 29. a collection mechanism; 291. a fixing plate; 2911. a first shaft hole; 2912. blocking nails; 2913. a baffle plate; 292. a pulling part; 2921. a body; 2922. a limiting plate; 29221. a limiting hole; 2923. a hook body; 293. a cam; 294. a rotating shaft; 295. a motor A; 296. an electric push rod C; 3. a water and dust removing mechanism; 31. receiving a plate; 311. an upper plate; 3111. comb teeth A; 31111. a tooth edge; 312. a support leg A; 313. a guard plate; 32. a turnover mechanism; 321. a frame; 322. a bearing A with a vertical seat; 323. a main shaft; 324. rotating the roller; 3241. a U-shaped groove; 3242. comb teeth B; 325. a motor B; 33. a lifting mechanism; 331. a substrate; 332. a guide bar; 333. a screw rod; 334. a motor C; 335. a lifting portion; 3351. a transverse comb tooth portion; 3352. a vertical comb portion; 34. a transfer mechanism; 341. a support; 342. a roller; 343. a transmission section; 3431. comb teeth C; 34311. a main rod portion; 34312. a hook part; 344. a motor D; 35. a lap plate; 4. a screening mechanism; 41. a speed reduction plate; 411. comb teeth D; 412. a protection plate; 413. a mixing channel; 42. a bounce component; 421. a springboard; 422. enclosing plates; 4221. a preferred channel; 43. a blower; 4222. a defective product channel; 5. a water washing mechanism; 51. a water washing pool; 511. a guide groove; 512 a first telescoping member; 52. draining the basin; 521. a second telescoping member; 522. a water leakage plate; 53. cleaning brushes; 531 guide bar; 532. brushing; 54 guide plate
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.
The embodiment of the invention is as follows, and as shown in fig. 1, fig. 17 and fig. 18, a table tennis ball collecting and processing method for training comprises the following steps:
(1) picking up: picking up scattered table tennis;
(2) collecting: collecting the table tennis balls picked up in the step (1);
(3) washing with water: putting the table tennis balls collected in the step (2) into a washing mechanism 5 for washing and then draining for a preset time;
(4) cleaning: dedusting and dewatering the table tennis balls treated in the step (3) in a dewatering and dedusting mechanism 3;
(5) screening: placing the table tennis balls treated in the step (4) in a screening mechanism 4 for screening;
wherein the dewatering and dust removing mechanism 3 comprises a transfer mechanism 34, the screening mechanism 4 comprises a speed reducing plate 41, one end of the speed reducing plate 41 is close to the transfer mechanism 34, the other end of the speed reducing plate 41 is provided with a bouncing assembly 42, the bouncing assembly 42 comprises a bouncing plate 421, the bouncing plate 421 is arranged below the speed reducing plate 41, a surrounding plate 422 is arranged around the bouncing plate 421, the upper end of the surrounding plate 422 at the side far from the transfer mechanism 34 is provided with a preferred passage 4221, one end of the preferred passage 4221 is fixed on the surrounding plate 422, the other end of the preferred passage 4221 is a free end, the speed reducing plate 41 is provided with a blower 43, the air outlet end of the blower 43 is opposite to the preferred passage 4221, the lower end of the surrounding plate 422 at the side far from the transfer mechanism 34 is provided with a defective passage 4222, one end of the defective passage 4222 is fixed on the bouncing plate 421, the other end of the defective product channel 4222 is a free end, the end of the speed reducing plate 41 is provided with a mixing channel 413, the width of the mixing channel 413 is matched with the diameter of a table tennis ball, the end of the mixing channel 413 is provided with a bounce port, the table tennis ball falls onto the springboard 421 from the bounce port, and the height difference between the springboard 421 and the preferred channel 4221 is a preset value; the table tennis balls subjected to dust removal and water removal in the step (4) fall onto the speed reduction plate 41 to continue rolling, the table tennis balls roll to the tail end of the speed reduction plate 41 and enter the mixing channel 413, the mixing channel 413 can only contain one table tennis ball, the horizontal speed of the table tennis balls rolling to the bounce opening is close to zero due to the friction force of the speed reduction plate 41, the table tennis balls fall onto the bounce plate 421 through the bounce opening and are bounced by the bounce plate 421, the bounced height of the table tennis balls without deformation and damage is greater than or equal to the height difference between the bounce plate 421 and the preferred channel 4221, the blower 43 is started, the intact table tennis balls bounce out of the bounce opening and are blown into the preferred channel 4221 by the blower 43 to roll out and are collected, and the bounced height of the table tennis balls subjected to deformation and damage is lower than the height difference between the bounce plate 421 and the preferred channel 4221, the deformed table tennis balls finally stop jumping in the coaming 422 due to gravity, roll out from the defective channel 4222 and are collected, and accordingly the collection and classification of the table tennis balls after training are completed.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 3 to 5, in the step (1), a picking mechanism 2 is used to pick up the scattered table tennis balls, the picking mechanism 2 includes a bottom plate 21, push handles 22 are symmetrically arranged at the bottom of the rear end of the bottom plate 21, push rods 23 are arranged between the top ends of the push handles 22 which are symmetrically arranged, universal wheels 24 are symmetrically arranged at the bottom of the push handles 22, a collecting frame 25 is arranged at the front part of the bottom plate 21, an opening is arranged at the front end of the collecting frame 25, a box bottom 26 is arranged at the bottom of the collecting frame 25, the front end of the box bottom 26 is hinged to the collecting frame 25, an electric push rod a27 is arranged at the rear end of the box bottom 26, the seat of the push rod 23 of the electric push rod a27 is fixedly connected with the bottom of the bottom plate 21, the piston rod of the electric push rod a27 abuts against the box bottom 26, a link mechanism 28 is arranged at the bottom of the bottom plate 21, the link mechanism 28 gathers scattered table tennis balls to the collecting frame 25, the collecting mechanism 29 is arranged at the upper part of the bottom plate 21, and the collecting mechanism 29 collects the table tennis balls at the collecting frame 25 into the collecting frame 25; the link mechanism 28 includes a first toggle part 281 and a second toggle part 282 which are symmetrically arranged, the first toggle part 281 and the second toggle part 282 have the same structure, the first toggle part 281 includes a first toggle rod 2811, the first toggle rod 2811 is pivotally connected to the base plate 21, the first toggle rod 2811 is provided with a lug plate 2812, the lug plate 2812 is provided with a first link 283, the base plate 21 is provided with a Y-shaped seat 284, the Y-shaped seat 284 includes a vertical part and two bifurcate parts, the vertical part is pivotally connected to the base plate 21, one end of the first link 283 is pivotally connected to the lug plate 2812, the other end of the first link 283 is pivotally connected to one of the bifurcate parts of the Y-shaped seat 284, the other bifurcate part of the Y-shaped seat 284 is provided with a second link 285, one end of the second link 285 is pivotally connected to one of the bifurcate part of the Y-shaped seat 284, and the other end of the second link 285 is provided with an electric push rod B286, the push rod 23 seat of the electric push rod B286 is fixedly connected with the bottom plate 21, the piston rod of the electric push rod B286 is pivotally connected with the second connecting rod 285, and the collecting frame 25 is arranged between the poke rod 2811 of the first poke part 281 and the second poke part 282; in the step (1), the poke rod 2811 is opened as an initial state, the push rod 23 is pushed, the picking mechanism 2 is enabled to move to a ping-pong ball scattering place until the two opened poke rods 2811 are filled with ping-pong balls, then the electric push rod B286 is started, the electric push rod B286 drives the poke rod 2811 to close through the connecting rod two 285, the Y-shaped seat 284 and the connecting rod one 283, the electric push rod B286 is closed, and the ping-pong balls are gathered between the poke rod 2811 and the collecting frame 25.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 4 and fig. 6 to 9, in the step (2), a collecting mechanism 29 is adopted to collect the picked table tennis balls, the collecting mechanism 29 includes a fixing plate 291, the fixing plate 291 is provided with a first shaft hole 2911 at the front end, a blocking pin 2912 is provided at the rear end, one end of the blocking pin 2912 is fixedly connected to the fixing plate 291, a blocking plate 2913 is provided at the other end, a pulling part 292 is movably provided on the fixing plate 291, the pulling part 292 includes a body 2921, the body 2921 includes a rear end part, an intermediate part and a front end part, the rear end part of the body 2921 is provided with a strip hole, the strip hole is provided on the blocking pin 2912, the intermediate part of the body 2921 is provided with a waist hole, a limiting plate 2922 is provided on one side of the body 2921 provided with the waist hole, the limiting plate 2922 is provided with a limiting hole 29221, a cam 293 is arranged between the body 2921 and the limit plate 2922, one end of the cam 293 is provided with a protruding part which is arranged in the limit hole 29221, the middle of the cam 293 is provided with a second shaft hole, a rotating shaft 294 is arranged in the waist hole, the rotating shaft 294 is tangent to the contour line of the waist hole, the rotating shaft 294 penetrates through the waist hole, one end of the rotating shaft is arranged in the second shaft hole, the other end of the rotating shaft penetrates through the first shaft hole 2911 and extends towards the outer side of the fixed plate 291 to form a first extending part, the first extending part is provided with a motor A295, the motor A295 is fixedly connected with the fixed plate 291, the front end part of the body 2921 is provided with a hook body 2923, a groove is arranged on the bottom plate 21 close to the collecting frame 25, the fixed plate 291 is arranged in the groove, an electric push rod 296 is arranged in the groove, and a push rod 23 seat of the electric push rod C is fixedly connected with the side wall of the groove, the piston rod of the electric push rod C296 is fixedly connected with the fixed plate 291; in the step (2), the motor a295 is started, the output shaft of the motor a295 rotates to drive the rotating shaft 294 to rotate, the front end portion of the pulling portion 292 is made to generate lifting motion through the waist hole, the pulling portion 292 is guaranteed to do linear motion through the long-strip hole, the pulling portion 292 collects table tennis balls at the front end of the collecting frame 25 into the collecting frame 25, the electric push rod C296 is started, the electric push rod C296 pushes the collecting mechanism 29 to do linear motion along the collecting frame 25 until the table tennis balls among the complete poking rods 2811 are collected, and the electric push rod C296 is closed.
The hinge hinged with the collecting frame 25 at the front end of the box bottom 26 is a damping hinge, namely a hydraulic hinge. The top mounted hydraulic hinge, model ejjfj-Y4517, can be chosen here.
The operating principle of the link mechanism 28 in the present invention: the bottom plate 21 is used for installing a link mechanism 28 and installing a collecting mechanism 29, the push handle 22 is used for installing a push rod 23, the height of the push handle 22 is preferably the height of a person to be picked up, the person to be picked up is prevented from bending down and bending knees to pick up ping-pong balls, wherein the push rod 23 is used as a force application point, by pushing the push rod 23, the whole picking mechanism 2 is pushed by the push rod 23 and moves through a universal wheel 24, a collecting frame 25 is matched with a box bottom 26 for collecting ping-pong balls, the box bottom 26 is hinged at the bottom of the collecting frame 25 to facilitate the opening and closing of the collecting frame 25, under the pushing of an electric push rod A27, the collecting frame 25 is opened, the ping-pong balls in the collecting frame 25 are poured in a basket or a bag, wherein the link mechanism 28 comprises a poking one part 281 and a poking two parts 282 which are symmetrical, the working principle of the link mechanism 28 is illustrated by taking the two poking rods 2811 closed when the piston rod of the electric push rod B286 is contracted to the limit, when the piston rod of the electric putter B286 extends, the angle between the two connecting rods 285 decreases, and the Y-shaped seat 284 rotates counterclockwise, so as to drive the first connecting rod 283 to rotate toward the electric putter B286, further drive the ear plate 2812 to rotate counterclockwise, and finally drive the dial rod 2811 to rotate counterclockwise, so that the two dial rods 2811 are opened. At this point, the power pushrod B286 is closed. When the two shifting rods 2811 are opened, the push rod 23 is pushed, and the table tennis ball is gathered between the two shifting rods 2811 and gathered to the opening of the collecting frame 25 under the action of the push rod. When the ping-pong ball is fully gathered between the two tap rods 2811, the electric putter B286 is started again to shorten the electric putter B286, and at this time, the two tap rods 2811 are closed.
Fixing plate 291's effect is used for installing and takes off portion 292 and cam 293, the shaft hole of fixing plate 291 front end is used for installing pivot 294, pivot 294's effect is used for transmitting the rotary motion of motor A295 to the bulge in cam 293, the effect of keeping off nail 2912 is used for guaranteeing to take off portion 292 and is linear motion, have direction and spacing effect, baffle 2913's effect prevents to take off portion 292 and drops, the effect of rectangular hole is the assurance to take off portion 292 ability seesaw, the effect of waist hole is used for guaranteeing to take off portion 292 and raises or reduces, the bulge of cam 293 is used for guaranteeing that the outline line of waist hole is tangent with pivot 294. When the table tennis balls are fully gathered between the two shifting rods 2811, a motor A295 in the collecting device is started, an output shaft of the motor A295 rotates to drive a rotating shaft 294 to rotate, a protruding portion of a cam 293 is limited in a limiting hole 29221, the contour line of a waist hole of the pulling portion 292 is tangent to the rotating shaft 294 due to the limiting effect of the cam 293, so that the pulling portion 292 is lifted and moves to a distance from the upper end of the table tennis ball, when the lowest end of the contour line of the waist hole is tangent to the rotating shaft 294, the pulling portion 292 is lowered to hook the table tennis ball, and the pulling portion 292 moves linearly, so that the table tennis balls between the two shifting rods 2811 are collected into the collecting frame 25, and in order to expand the collecting range of the collecting mechanism 29, the whole collecting mechanism 29 is pushed through an electric push rod C296.
In another embodiment of the present invention based on the above embodiment, as shown in fig. 1 and fig. 2, in the step (3), the collected table tennis balls are conveyed by the conveying mechanism 1 to the upper side of the washing mechanism 5 and are thrown into the washing mechanism 5, the conveying mechanism 1 includes an input end and an output end, the input end of the conveying mechanism 1 is provided with the collecting mechanism 29, the collecting frame 25 is arranged on the upper side of the input end of the conveying mechanism 1, the conveying mechanism 1 is a slope conveyor, the input end of the conveying mechanism 1 is lower than the output end of the conveying mechanism 1, in the step (3), the push rod 23 is pushed, the collecting frame 25 of the picking mechanism 2 is arranged on the upper portion of the input end of the conveying mechanism 1, the electric push rod a27 is started, the electric push rod a27 forces the box bottom 26 to leave the collecting frame 25 to form a gap, and the table tennis balls roll down from the gap onto the input end of the conveying mechanism 1, closing the electric push rod A27 to make the box bottom 26 completely fit with the collecting frame 25; then the conveying mechanism 1 is started, the table tennis balls move from the input end of the conveying mechanism 1 to the output end of the conveying mechanism 1 and drop into the water washing mechanism 5, the conveying mechanism 1 is closed, and the conveying mechanism 1 stops moving.
The conveying mechanism 1 is a apron type conveyor with flanges.
The conveying mechanism 1 is a slope conveyor, the input end of the slope conveyor is in a horizontal state, the output end of the slope conveyor is also in a horizontal state, a slope portion is arranged between the input end and the output end, the input end is used for receiving the table tennis balls picked up by the picking mechanism 2, the slope portion is mainly used for conveying the table tennis balls and conveying the table tennis balls to the output end, and the table tennis balls conveyed to the output end fall into a basket or a bag in a parabolic state due to inertia.
The conveying mechanism 1 may also be a trough conveyor.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 19 and 20, the washing mechanism 5 includes a washing basin 51, a first telescopic member 512, a washing brush 53 and a draining basin 52 disposed at the tail end of the washing basin 51, the opposite side walls of the washing basin 51 are provided with horizontally disposed guide slots 511, the guide slots 511 extend to the tail end of the washing basin 51, the washing brush 53 includes a guide rod 531 and bristles 532 disposed on the guide rod 531, the guide rod 531 penetrates through the opposite side walls to be provided with the guide slots 511, the fixed end of the first telescopic member 512 is fixed on the side walls of the washing basin 51, the telescopic end is connected with the guide rod 531, the first telescopic member 512 is used for driving the washing brush 53 to move along the guide slots 511, the bottom of the draining basin 52 is provided with a plurality of water leakage holes, the first side plate of the draining basin 52 is provided with a second telescopic member 521, the fixed end of the second extensible member 521 is fixedly connected with the first side plate, the draining basin 52 comprises a water leaking plate 522 at the bottom, and a first side plate and a second side plate which are arranged oppositely, one end of the water leaking plate 522 is hinged with the second side plate which is arranged oppositely by the first side plate, the other end of the water leaking plate is connected with the movable end of the second extensible member 521, the extension and retraction of the second extensible member 521 is used for driving the water leaking plate of the draining basin 52 to rotate along the hinged point of the water leaking plate and the second side plate to realize the opening and closing of the water leaking plate 522, the water leaking plate 522 is provided with a guide plate 54, and the tail end of the guide plate 54 is positioned above the water and dust removing mechanism 3; step (3) in conveying mechanism 1 the table tennis that falls into in washing pond 51 float at the surface of water, the extension of the first extensible member 512 of control, the drive the cleaning brush 53 removes to the direction of draining basin 52, brush hair 532 brushes table tennis and rolls until all table tennis fall into to the direction of draining basin 52 in the draining basin 52, start the second extensible member 521 after the scheduled time, force the bottom plate 21 of draining basin 52 to rotate, bottom plate 21 opens and shuts, the table tennis of collection rolls over to after on the guide plate 54 from the opening part the dewatering dust removal mechanism 3 is interior.
In another embodiment of the present invention based on the above embodiment, as shown in fig. 10 to 16, the water and dust removing mechanism 3 includes a receiving plate 31, the receiving plate 31 is used for receiving the table tennis balls output from the guide plate 54, a tilting mechanism 32 and a lifting mechanism 33 are disposed on a side of the receiving plate 31 away from the washing mechanism 5, the tilting mechanism 32 is disposed between the receiving plate 31 and the lifting mechanism 33, the tilting mechanism 32 tilts the table tennis balls on the receiving plate 31 to the lifting mechanism 33, the conveying mechanism 34 is disposed on a side of the lifting mechanism 33, the conveying mechanism 34 is disposed on an upper side of the tilting mechanism 32, and the lifting mechanism 33 lifts the table tennis balls to the conveying mechanism 34.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the screening mechanism 4 is disposed near the water and dust removing mechanism 3, the screening mechanism 4 is disposed on the upper side of the output end of the conveying mechanism 1, and the delivering mechanism 34 rotates to deliver the table tennis balls to the screening mechanism 4.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 11 to 16, the receiving plate 31 includes an upper plate 311 and a support leg a312 disposed at the bottom of the upper plate 311, the upper plate 311 is provided with comb teeth a3111 in a linear array, the end of the comb teeth a3111 is provided with a tooth edge 31111 bending upward, two sides of the upper plate 311 are symmetrically provided with guard plates 313, the guard plates 313 are disposed at two sides of the comb teeth a3111, the turnover mechanism 32 includes a frame 321 symmetrically disposed, the frame 321 is provided with a vertical seat bearing a322, the vertical seat bearing a322 is provided with a main shaft 323, the main shaft 323 is provided with a rotating roller 324, the main shaft 323 is disposed in the rotating roller 324, one end of the main shaft 323 extends to the outer side of the vertical seat bearing a322 to form an extension portion two, the extension portion two is provided with a motor B325, the rotating roller 324 is a cylinder, the outer side of the cylinder of the rotating roller 324 is provided with a U-shaped groove 3241, one side of the U-shaped groove 3241 is provided with comb teeth B3242, a gap A is formed between adjacent comb teeth A3111, the width of the comb teeth B3242 is equal to the width of the gap A, the lifting mechanism 33 comprises a substrate 331, guide rods 332 are symmetrically arranged on the substrate 331, a screw rod 333 is arranged on the substrate 331, the bottom of the screw rod 333 is provided with a motor C334, the output shaft of the motor C334 is connected with one end of the screw rod 333, a lifting part 335 is arranged on the screw rod 333, the lifting part 335 comprises a transverse comb tooth part 3351 and a vertical comb tooth part 3352, a through hole is arranged at the joint of the transverse comb tooth part 3351 and the vertical comb tooth part 3352, the screw rod 333 is arranged in the through hole, an internal thread corresponding to the external thread of the screw rod 333 is arranged in the through hole, guide holes are arranged at two sides, the guide hole is internally provided with the guide rod 332, the transmission mechanism 34 comprises a support 341 which is symmetrically arranged, the support 341 is provided with a vertical bearing seat B, the vertical bearing seat B is internally provided with a roller 342, the roller 342 is provided with a transmission part 343, the transmission part 343 comprises a hollow cylinder, the circumferential array at the outer side of the hollow cylinder is provided with comb teeth C3431, the comb teeth C3431 comprise a main rod part 34311 and a hook body part 34312, the hook body part 34312 is arranged at the tail end of the main rod part 34311, a gap B is formed between the adjacent vertical comb tooth parts 3352 and between the adjacent horizontal comb tooth parts 3351, the widths of the main rod part 34311 and the hook body part 34312 are both equal to the width of the gap B, the roller 342 penetrates through the hollow cylinder, one end extends to the outer side of the vertical bearing seat B to form a third extending part, and the third extending part is provided with a motor D344, a bridging plate 35 is arranged between the turnover mechanism 32 and the lifting mechanism 33, and the bridging plate 35 is arranged at the lower side of the bracket 341; in the step (4), the motor C334 is started first to ensure that the height of the transverse comb tooth part 3351 of the lifting part 335 is equal to the height of the lapping plate 35, the motor C334 is turned off, then the motor B325 is started again, the motor B325 drives the main shaft 323 to rotate, the main shaft 323 drives the rotary roller 324 to rotate, the comb teeth B3242 are arranged in the gap a, the table tennis balls on the comb teeth a3111 are lifted by the comb teeth B3242 along with the rotation of the rotary roller 324 and roll down in the U-shaped groove 3241 in the lifting process, the motor B325 is kept to rotate continuously until all the table tennis balls in the U-shaped groove 3241 roll down on the lapping plate 35, the motor B325 is turned off, the motor C334 is started again after all the table tennis balls roll down on the transverse comb tooth part 3351 from the lapping plate 35, the table tennis balls are lifted to the proper height, the motor C334 is turned off, the motor D344 is started again, the main rod part 34311 is arranged in the gap B, and the table tennis balls on the transverse comb tooth part 3351 are lifted and kept to enter the comb tooth part 34312, the rotation of the motor D344 is continuously maintained until the table tennis ball on the hook part 34312 rolls down to the speed reduction plate 41, and after a plurality of turns, the residual water drops and other attachments on the table tennis ball are removed.
The working principle of the dewatering and dust removing mechanism 3 in the invention is as follows: the motor B325 is started, the output shaft of the motor B325 rotates to drive the main shaft 323 to rotate, further drives the rotating roller 324 to rotate, the comb teeth B3242 lift the table tennis from the comb teeth A3111, and rolls down into the U-shaped groove 3241, the motor B325 continues to rotate, the table tennis ball entering the U-shaped groove 3241 rolls down onto the transverse comb tooth part 3351 on the lifting mechanism 33 through the lapping plate 35, at this time, the table tennis ball is turned over for the first time, at this time, the height of the lifting part 335 is adjusted through the motor C334, the height of the transverse comb tooth part 3351 is kept consistent with that of the lapping plate 35, the table tennis ball is convenient to move onto the transverse comb tooth part 3351, and when the lifting part 335 is lifted to the transfer mechanism 34, the motor D344 is started, the main rod part 34311 in the transmission part 343 extends into the gap B in the transverse comb teeth, the table tennis ball is moved to the hook body part 34312, stopping the motor D344 at a certain angle eventually collects the table tennis balls straight in the basket or bag, at which point the second flipping of the table tennis balls is completed.
On the basis of the above embodiment, in another embodiment of the present invention, the side portions of the comb teeth a3111, B3242 and C3431 are provided with flexible brushes, and the flexible brushes are located in the gaps between the comb teeth. So set up, flexible brush plays the effect of cleaning and brushing in table tennis transportation process, and water, dust and impurity in the table tennis of collection are clear away totally.
On the basis of the above embodiment, in another embodiment of the present invention, the horizontal distance from one end of the decelerating plate 41 close to the transmission mechanism 34 to the hollow cylinder of the transmitting part 343 is smaller than the length of the main rod part 34311.
In another embodiment of the present invention, as shown in fig. 17 and 18, the decelerating plate 41 is provided with comb teeth D411, a gap C is formed between adjacent comb teeth D411, the width of the main rod portion 34311 is equal to the width of the gap C, two sides of the decelerating plate 41 are provided with protective plates 412, the protective plates 412 are arranged on two sides of the comb teeth D411, the bounce plate 421 is obliquely arranged, the height of the side close to the decelerating plate 41 is greater than the height of the side far from the decelerating plate 41, the height of the preferred passage 4221 relative to the ground is lower than the height of the mixing passage 413 relative to the ground, and the defective passage 4222 is arranged below the preferred passage 4221 and is oriented in parallel with the preferred passage 4221.
Since the bounce board 421 is obliquely arranged, when the table tennis ball in the mixing channel 413 touches the bounce board 421, the table tennis ball without deformation bounces, and because of friction, the bounced height of the table tennis ball without deformation is lower than that of the mixing channel 413, so that the height of the preferred channel 4221 relative to the ground is lower than that of the mixing channel 413 relative to the ground, when the bounced height of the table tennis ball without deformation is greater than that of the preferred channel 4221, the table tennis ball without deformation is directly blown into the preferred channel 4221 by the blower 43, and the table tennis ball with deformation may be bounced by the bounce board 421 to a certain height or not be bounced, and the bounced height of the table tennis ball with deformation is lower than that of the preferred channel 4221, in order to prevent the table tennis ball with deformation from being accumulated in the coaming 422, the direction of the defective channel 4222 is parallel to the direction of the preferred channel 4221, thereby ensuring that the table tennis ball with deformation rolls on the obliquely arranged bounce board 421 to the defective channel 4222, collected by the reject passage 4222.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.