CN114208501B

CN114208501B - Towed straw collection device of harvester

Info

Publication number: CN114208501B
Application number: CN202111531483.4A
Authority: CN
Inventors: 张文虎
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2023-05-30
Anticipated expiration: 2041-12-14
Also published as: CN114208501A

Abstract

The invention discloses a towed straw collecting device of a harvester, which relates to the technical field of agricultural machinery and comprises a base box, wherein a first air cylinder, a second air cylinder, a driving member, a connecting column and a pressurizing structure are sequentially arranged at the top end of the inside of the base box, a collecting box is arranged at the lower side of the inside of the base box, which is close to the pressurizing structure, a second driving frame which is inclined towards the top of the collecting box, is arranged at the lower side of the inside of the base box, which is close to the driving member and the connecting column, a winding mechanism is arranged at the bottom end of the first air cylinder, and a plurality of clamping plates which are distributed with the winding mechanism in a staggered manner are arranged at the bottom end of the second air cylinder. According to the straw collecting device, the straw can be authorized to the inside of the base box from the ground through the winding mechanism, meanwhile, the straw can be moved from the winding mechanism through the clamping plates which are distributed in a staggered mode with the second barb parts in the winding mechanism, and meanwhile, the straw can be moved onto the collecting conveyor belt by being matched with the fan in the winding mechanism, so that the efficiency of entering the straw into the device can be improved.

Description

Towed straw collection device of harvester

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a towed straw collecting device of a harvester.

Background

The straw is the mature stem and leaf part of crops, has the characteristics of large total amount, high combustion heat value and the like, has higher recovery value, generally adopts special agricultural equipment for recovering the straw in modern agriculture so as to reduce the labor intensity of personnel, and has the characteristics of high efficiency, large single recovery amount and the like of agricultural machinery.

Through searching, chinese patent discloses a straw collecting device (publication No. CN 107960207B), the side wall of the patent vehicle body is connected with a first connecting rod, one end of the first connecting rod, which is far away from the vehicle body, is rotationally connected with a first sleeve, an agricultural fork body is movably inserted in the first sleeve, the side wall of the first sleeve is in threaded connection with a bolt, and one end of the bolt, which is positioned in the first sleeve, is propped against the upper end face of the agricultural fork body.

In the prior art, for example, in fig. 1, the recovery efficiency of the straw on the land is slower, and more soil is carried into the equipment during recovery, so that the capacity is reduced, and the straw is easy to stay in the equipment during conveying of the straw.

Disclosure of Invention

The invention aims to provide a towed straw collecting device of a harvester, which solves the following technical problems:

how to quickly move the straw from the ground to the equipment, thereby improving the recycling efficiency of the straw;

how to prevent the straw from being remained in the equipment during the treatment;

how to improve the treatment quality of the straw, thereby increasing the single recovery quantity.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides a harvester towed straw collection device, includes the base case, first cylinder, second cylinder, actuating member, spliced pole and pressurization structure are installed in proper order on the inside top of base case, and the base incasement portion is close to the downside of pressurization structure and installs the collecting box for hold the straw of collection, the collecting conveyor belt that inclines towards collecting box top is installed to the downside that is close to actuating member and spliced pole in the base incasement portion, winding mechanism is installed to the bottom of first cylinder for carry the straw to equipment from subaerial, the cardboard of a plurality of and winding mechanism staggered distribution is installed to the bottom of second cylinder for remove the straw to the upside of collecting the conveyer belt, and carry to the collecting box through collecting the conveyer belt in, the bottom of actuating member is installed and is set up the impression roller in collecting the conveyer belt upside, the tractor that is located impression roller and collecting conveyer belt junction one side is installed to the bottom of spliced pole for drag the straw between impression roller and the collecting conveyer belt.

As a further scheme of the invention: the inside outside fixedly connected with reinforcement frame that is close to the collecting box of base case for consolidate the inside at the base case with the collecting box, the reinforcement frame is including setting up the support body in the collecting box both sides, and the equal spiro union in both ends of support body has the horizontal pole of a plurality of parallel distribution for with the collecting box centre gripping inside.

As a further scheme of the invention: the winding mechanism comprises a driving box connected with a first cylinder, a rotary drum is rotationally connected in the driving box, a plurality of second barb elements distributed at equal intervals are annularly arranged on the outer side of the rotary drum, assembly joints are formed in the second barb elements between each row, and a plurality of clamping plates are distributed among the assembly joints respectively, so that straws on the outer side of each row of rotary drum can be conveniently taken down when the rotary drum passes through.

As a further scheme of the invention: the side face of the driving box is provided with a plurality of fans, and the air outlets of the fans face towards the joint part of the clamping plate and the second barb piece, so that straws are conveniently blown to the upper side of the collecting conveyor belt.

As a further scheme of the invention: the collecting conveyor belt is connected with the extension board that can reset towards the one end rotation of collecting box, the one end that the extension board kept away from the collecting conveyor belt extends to the upside of collecting box, and the rotation orbit of extension board towards collecting box one end is located the outside of collecting box to when the extension board rotates, avoid contacting the edge of collecting box, lead to causing the hindrance to its rotation.

As a further scheme of the invention: the extension board includes the plate body of being connected with collecting the conveyer belt rotation, the plate body is offered fluted position towards one side of collecting the conveyer belt, and fluted position is used for installing the extension board to the both sides of collecting the conveyer belt, and all fixedly connected with first elastic component between the both sides of plate body lower surface and the collecting the conveyer belt.

As a further scheme of the invention: the tractor comprises a first driving frame, a rotating belt is connected to the inside of the first driving frame in a rotating mode, the output end of the first driving frame is connected with the input end of the rotating belt and used for controlling the rotating belt to rotate, and a plurality of first barb elements are fixedly connected to the outer side of the rotating belt and used for dragging straws between the collecting conveying belt and the pressing roller.

As a further scheme of the invention: the driving member comprises an assembly box connected with the base box, the two ends of the assembly box are fixedly connected with first driving motors, the two ends of the pressing roller are respectively provided with a pipe body, two groups of pipe bodies respectively extend to the inside of two sides of the assembly box, the outer sides of the two groups of pipe bodies and the output ends of the two groups of first driving motors are fixedly connected with connecting gears, and synchronous belts are respectively sleeved between the four groups of corresponding connecting gears and used for driving the pressing roller to rotate.

As a further scheme of the invention: the outer surface of the pressing roller is provided with a plurality of protruding particles which are uniformly distributed and used for improving the pressing quality of the straw.

As a further scheme of the invention: the collecting conveyor belt comprises two groups of second driving frames, a plurality of driving rollers which are equidistantly distributed are rotationally connected between the two groups of second driving frames, a plurality of conveyor belts are sleeved on the outer sides of the plurality of driving rollers, the output ends of the two groups of second driving frames are connected with the two ends of each driving roller and used for driving the driving rollers to rotate, and accordingly straw is driven to move through each driving roller.

As a further scheme of the invention: gaps with the same distance are arranged among the conveying belts, and the gaps are used for discharging soil and other impurities mixed in the straw when the straw moves.

As a further scheme of the invention: the collecting box comprises a box body, the bottom of the box body is fixedly connected with a base plate through a bolt, the box body and the base plate can be detached when the straw is taken out, and one side of the box body is hinged with a sealing door through a hinge and used for opening the box body from the side face and taking out the straw.

As a further scheme of the invention: the box inner wall has all been seted up a plurality of lines and has been accomodate the groove, and the inside of a plurality of accomodate the groove is all rotated and is connected with the limiting plate, a plurality of equal fixedly connected with second elastic component between limiting plate and the corresponding accomodate groove, through accomodating the groove, can carry out spacingly in certain limit with the straw after the compression.

As a further scheme of the invention: the pressurizing structure comprises a fixed box fixedly connected with the base box, one side of the fixed box is fixedly connected with a second driving motor, the inside of the fixed box is rotationally connected with a bidirectional screw rod, and the output end of the second driving motor is connected with one end of the bidirectional screw rod and used for controlling the bidirectional screw rod to rotate.

As a further scheme of the invention: the fixed box is characterized in that the pressing plate used for extrusion is arranged on the lower side of the fixed box, two groups of threads with opposite rotation directions are arranged on the two sides of the bidirectional screw, the outer sides of the two groups of threads are connected with moving sleeves in a threaded manner, the two groups of moving sleeves are connected with the pressing plate in a rotating manner, and a transmission rod is connected between the two groups of moving sleeves and the pressing plate in a rotating manner, so that the pressing plate can be driven to move in the vertical direction when the bidirectional screw rotates.

As a further scheme of the invention: the telescopic pipe is fixedly connected between the upper surface of the pressing plate and the fixed box and consists of a plurality of cylinders in sliding connection and is used for supporting the pressing plate when the pressing plate moves.

As a further scheme of the invention: after the pressing plate descends to the inside of the box body, the edge of the pressing plate is positioned between the limiting plates, so that the pressing plate is prevented from touching the limiting plates when the pressing plate is lifted.

The invention has the beneficial effects that:

according to the straw collecting device, the straw can be authorized to the inside of the base box from the ground through the winding mechanism, meanwhile, the straw can be moved from the winding mechanism through the clamping plates which are distributed in a staggered manner with the second barb elements in the winding mechanism, and meanwhile, the straw can be moved to the collecting conveyor belt by matching with the fan in the winding mechanism, so that the efficiency of entering the straw into the device can be improved;

meanwhile, the straws can be pressed and attached to the collecting conveyor belt through the pressing roller, and the pressed straws can be dragged out from between the pressing roller and the collecting conveyor belt through the dragging device, so that the straws are prevented from being detained in the structure, and a plurality of gaps are formed between the collecting conveyor belts, so that the mixed soil and impurities in the straws can be conveniently screened;

further, the collecting box can pressurize the collected straws through the pressurizing structure, and when the pressing plate in the pressurizing structure descends, the extending plate on the collecting conveyor belt rotates after touching, so that the pressing plate is prevented from being blocked, meanwhile, a plurality of rows of limiting plates are arranged in the collecting box, and after the straws are pressurized, the straws can be limited in a certain range.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic view of the structure of the extension plate of the present invention;

FIG. 4 is a side view of the retractor of the invention;

FIG. 5 is a partial cross-sectional view of the driving member and the pressing roller in the present invention;

FIG. 6 is a partial top view of the collection belt of the present invention;

FIG. 7 is a side cross-sectional view of the collection box of the present invention;

fig. 8 is a schematic structural view of the pressurizing structure in the present invention.

In the figure: 1. a base box; 2. a first cylinder; 3. a winding mechanism; 4. a second cylinder; 5. a clamping plate; 6. a driving member; 7. a pressing roller; 8. a connecting column; 9. a puller; 10. a collection box; 11. a pressurizing structure; 12. collecting a conveying belt; 13. a reinforcing frame; 14. an extension plate; 141. a plate body; 142. a groove part; 143. a first elastic member; 91. a first driving frame; 92. rotating the belt; 93. a first barb member; 61. assembling a box; 62. a first driving motor; 63. a synchronous belt; 71. protruding particles; 72. a connecting gear; 121. a second driving frame; 122. a conveyor belt; 123. a driving roller; 124. a gap; 101. a case; 102. sealing the door; 103. a storage groove; 104. a limiting plate; 105. a second elastic member; 111. a fixed box; 112. a second driving motor; 113. a bidirectional screw; 114. a transmission rod; 115. pressing the plate; 116. a telescopic tube; 31. a drive box; 32. a rotating drum; 33. a second barb member; 34. a blower.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 2, the invention discloses a towed straw collecting device of a harvester, which comprises a base box 1, wherein a first cylinder 2, a second cylinder 4, a driving member 6, a connecting column 8 and a pressing structure 11 are sequentially arranged at the top end inside the base box 1, a collecting box 10 is arranged at the bottom end inside the base box 1 and close to the pressing structure 11, the base box 1 is used for containing collected straws, the tail part of the harvester can be connected, wheels can be arranged at the outer side of the base box 1 and used for synchronously moving with the harvester, the straws are scattered on the ground after the harvester harvests the straws, so that the straw collecting device is convenient to collect the straws, a collecting conveyor belt 12 inclined towards the top of the collecting box 10 is arranged at the bottom end inside the base box 1 and close to the driving member 6, a winding mechanism 3 is arranged at the bottom end of the first cylinder 2, a plurality of clamping plates 5 which are distributed in a staggered manner with the winding mechanism 3 are used for moving the straws to the upper side of the collecting conveyor belt 12, the straws are conveyed to the collecting conveyor belt 12 through the collecting conveyor belt 12, the collecting conveyor belt 10 is arranged at the bottom end inside the base box 1, a position between the bottom end of the driving member 6, the collecting conveyor belt 7 is arranged at the bottom end of the collecting conveyor belt 12 and a pressing roller 7 is arranged at the bottom end of the collecting conveyor belt 7, and is connected with the pressing roller 7, and the collecting conveyor belt is arranged at the position between the collecting conveyor belt 7 and the bottom end is arranged at the bottom end 7, and is connected with the pressing roller conveyor belt 7, and is arranged.

The inside outside fixedly connected with reinforcement frame 13 that is close to collecting box 10 of base case 1 for consolidate collecting box 10 in the inside of base case 1, reinforcement frame 13 is including setting up the support body at collecting box 10 both sides, and the equal spiro union in both ends of support body has the horizontal pole of a plurality of parallel distribution, is used for holding collecting box 10 inside.

The winding mechanism 3 comprises a driving box 31 connected with the first cylinder 2, a rotary drum 32 is rotationally connected in the driving box 31, a plurality of rows of second barb elements 33 distributed at equal intervals are annularly arranged on the outer side of the rotary drum 32, assembly joints are respectively formed in the second barb elements 33 between each row, and a plurality of clamping plates 5 are respectively distributed between the assembly joints, so that straws on the outer side of each row of rotary drum 32 can be conveniently taken down when passing through.

The side face of the driving box 31 is provided with a plurality of fans 34, and air outlets of the fans 34 face to the joint part of the clamping plate 5 and the second barb piece 33, so that straws are conveniently blown to the upper side of the collecting and conveying belt 12.

The collecting conveyor belt 12 is rotatably connected with the extension plate 14 which can reset towards one end of the collecting tank 10, one end of the extension plate 14 away from the collecting conveyor belt 12 extends to the upper side of the collecting tank 10, and the rotating track of the extension plate 14 towards one end of the collecting tank 10 is positioned on the outer side of the collecting tank 10, so that when the extension plate 14 rotates, the extension plate 14 is prevented from contacting the edge of the collecting tank 10, and the rotation of the extension plate is prevented.

Referring to fig. 3, the extension board 14 includes a board body 141 rotatably connected to the collecting conveyor belt 12, a groove portion 142 is formed on a side of the board body 141 facing the collecting conveyor belt 12, the groove portion 142 is used for mounting the extension board 14 on two sides of the collecting conveyor belt 12, and first elastic members 143 are fixedly connected between two sides of the lower surface of the board body 141 and the collecting conveyor belt 12.

Referring to fig. 4, the dragging device 9 includes a first driving frame 91, a rotating belt 92 is rotatably connected to the inside of the first driving frame 91, and an output end of the first driving frame 91 is connected to an input end of the rotating belt 92 for controlling the rotating belt 92 to rotate, and a plurality of first barbs 93 are fixedly connected to the outside of the rotating belt 92 for dragging the straw between the collecting and conveying belt 12 and the pressing roller 7.

Referring to fig. 5, the driving member 6 includes an assembling box 61 connected with the base box 1, two ends of the assembling box 61 are fixedly connected with a first driving motor 62, two ends of the pressing roller 7 are respectively provided with a tube body, two groups of tube bodies respectively extend into two sides of the assembling box 61, two groups of tube body outsides and output ends of the two groups of first driving motors 62 are respectively fixedly connected with a connecting gear 72, and synchronous belts 63 are respectively sleeved between the four groups of corresponding connecting gears 72 and used for driving the pressing roller 7 to rotate.

The outer surface of the pressing roller 7 is provided with a plurality of protruding particles 71 which are uniformly distributed for improving the pressing quality of the straw.

Referring to fig. 6, the collecting conveyor belt 12 includes two sets of second driving frames 121, a plurality of driving rollers 123 are rotatably connected between the two sets of second driving frames 121, a plurality of conveyor belts 122 are sleeved outside the plurality of driving rollers 123, and output ends of the two sets of second driving frames 121 are connected with two ends of each driving roller 123 and are used for driving the driving rollers 123 to rotate, so that straws are driven to move by each driving roller 123.

Gaps 124 with the same distance are arranged among the plurality of conveyor belts 122, and are used for discharging soil and other impurities mixed in the straw when the straw moves.

Referring to fig. 7, the collecting box 10 includes a box 101, a base plate is fixedly connected to the bottom of the box 101 through bolts, when straw is taken out, the box 101 and the base plate can be separated, and a sealing door 102 is hinged to one side of the box 101 through a hinge, so that the box 101 is opened from the side to take out the straw.

The inner wall of the box body 101 is provided with a plurality of rows of storage grooves 103, the inside of each storage groove 103 is rotationally connected with a limiting plate 104, a plurality of limiting plates 104 and corresponding storage grooves 103 are fixedly connected with second elastic pieces 105, and compressed straws can be limited in a certain range through the storage grooves 103.

Referring to fig. 8, the pressurizing structure 11 includes a fixed box 111 fixedly connected to the base box 1, a second driving motor 112 is fixedly connected to one side of the fixed box 111, a bi-directional screw 113 is rotatably connected to the inside of the fixed box 111, and an output end of the second driving motor 112 is connected to one end of the bi-directional screw 113 for controlling the bi-directional screw 113 to rotate.

The downside of fixed box 111 is provided with and is used for extruded pressing plate 115, and the both sides of two-way screw 113 are provided with two sets of opposite screw threads of direction of rotation, and the outside of two sets of screw threads is equal threaded connection has the removal cover, all rotates between two sets of removal covers and the pressing plate 115 and is connected with transfer line 114, and when two-way screw 113 rotated, can drive pressing plate 115 and carry out the removal of vertical direction.

A telescopic tube 116 is fixedly connected between the upper surface of the pressing plate 115 and the fixed box 111, and the telescopic tube 116 is formed by slidably connecting a plurality of columns and is used for supporting the pressing plate 115 when the pressing plate 115 moves.

After the pressing plate 115 is lowered into the case 101, the edge thereof is positioned between the respective stopper plates 104, thereby avoiding touching the stopper plates 104 when being raised.

The working principle of the invention is as follows:

starting the driving box 31 to drive the rotary drum 32 to rotate so as to drive each second barb element 33 to rotate, thereby rolling up the straws on the ground, when the corresponding second barb element 33 passes through the clamping plate 5, the clamping plate 5 and the second barb element 33 rotate in a staggered way, simultaneously taking down the straws from the second barb element 33, simultaneously starting the fan 34, and moving the straws to the upper side of the collecting conveyor belt 12 in cooperation with the clamping plate 5;

after the straw moves to the upper side of the collecting conveyor belt 12, soil or impurities fall from a gap 124 in the collecting conveyor belt 12, and when the pressing roller 7 is passed through, the pressing roller 7 is driven by the first driving motor 62 in the driving member 6 to rotate, and meanwhile, the straw is pressed by the convex particles 71 on the outer side of the pressing roller 7, and the pressed straw moves to one side of the tractor 9;

starting a first driving frame 91 in the towing device 9 to drive the rotating belt 92 to rotate, so as to drive each first barb member 93 to rotate, embedding one tilted end of the first barb member 93 into the straw when rotating, and towing the straw when moving, so that the straw overflows from between the pressing roller 7 and the collecting and conveying belt 12, and is prevented from being detained on the upper side of the collecting and conveying belt 12;

then, the collecting and conveying belt 12 conveys the straws to the top end and slides down along the extending plate 14 into the collecting box 10, after conveying the straws with the moving quantity, the second driving motor 112 in the pressurizing structure 11 is started, the second driving motor 112 drives the bidirectional screw 113 to rotate after being started, so that the two groups of transmission rods 114 are driven to move in opposite directions, the pressing plate 115 is further pressed downwards, when the pressing plate 115 moves downwards, the plate body 141 contacts with the plate body 141 in the extending plate 14, after being pressed, the plate body 141 rotates by compressing the first elastic piece 143, thereby avoiding obstruction to the pressing plate 115, the pressing plate 115 presses the straws after being lowered into the box 101 in the collecting box 10, the volume of the straws is compressed, when the straws are pressed, the straws pass through the limiting plate 104 in the box 101, the limiting plate 104 rotates into the inside of the containing groove 103 by pressing the second elastic piece 105, then the pressing plate 115 is restored, and the limiting plate 104 on the compressed straws is restored by the second elastic piece 105, so that the edges of the compressed straws are limited.

The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.

Claims

1. The utility model provides a harvester towed straw collection device, includes base box (1), first cylinder (2), second cylinder (4), drive member (6), spliced pole (8) and pressurization structure (11) are installed in proper order on the inside top of base box (1), and base box (1) is inside to be close to the downside of pressurization structure (11) and install collecting box (10), characterized in that, second drive frame (121) towards collecting box (10) top slope are installed to inside being close to of base box (1) drive member (6) and the downside of spliced pole (8), winding mechanism (3) are installed to the bottom of first cylinder (2), cardboard (5) of a plurality of crisscross distribution with winding mechanism (3) are installed to the bottom of second cylinder (4), pressure roller (7) of setting in collecting conveyer belt (12) upside are installed to the bottom of drive member (6), tow ware (9) that are located pressure roller (7) and collecting conveyer belt (12) junction one side are installed to the bottom of spliced pole (8);

the tractor (9) comprises a first driving frame (91), a rotating belt (92) is rotatably connected to the inside of the first driving frame (91), the output end of the first driving frame (91) is connected with the input end of the rotating belt (92), and a plurality of first barb elements (93) are fixedly connected to the outer side of the first driving frame (91).

2. The towed straw collection device of a harvester according to claim 1, characterized in that the winding mechanism (3) comprises a driving box (31) connected with a first cylinder (2), a rotating drum (32) is rotatably connected in the driving box (31), a plurality of rows of second barb elements (33) distributed at equal intervals are annularly arranged on the outer side of the rotating drum (32), and an assembly seam is formed between each row of second barb elements (33).

3. The hauling type straw collecting device of a harvester according to claim 2, wherein a plurality of fans (34) are installed on the side face of the driving box (31), and air outlets of the fans (34) face towards the joint part of the clamping plate (5) and the second barb piece (33).

4. The towed straw collection device of a harvester according to claim 1, wherein a resettable extension plate (14) is rotatably connected to one end of the collection conveyor belt (12) toward the collection tank (10), one end of the extension plate (14) away from the collection conveyor belt (12) extends to an upper side of the collection tank (10), and a rotation track of the extension plate (14) toward one end of the collection tank (10) is located outside the collection tank (10).

5. The haulage straw collecting apparatus as claimed in claim 4, wherein the extension plate (14) includes a plate body (141) rotatably connected to the collecting conveyor belt (12), a groove portion (142) is formed on one side of the plate body (141) facing the collecting conveyor belt (12), the groove portion (142) is used for mounting the extension plate (14) on two sides of the collecting conveyor belt (12), and a first elastic member (143) is fixedly connected between two sides of a lower surface of the plate body (141) and the collecting conveyor belt (12).

6. The towed straw collection device of a harvester according to claim 1, wherein the collection conveyor belt (12) comprises two groups of second driving frames (121), a plurality of driving rollers (123) which are equidistantly distributed are rotatably connected between the two groups of second driving frames (121), a plurality of conveyor belts (122) are sleeved outside the plurality of driving rollers (123), and the output ends of the two groups of second driving frames (121) are connected with the two ends of each driving roller (123).

7. The towed straw collection device of a harvester of claim 6, wherein a plurality of said conveyor belts (122) are each provided with a gap (124) of equal distance therebetween.

8. The towed straw collection device of a harvester according to claim 1, wherein the collection box (10) comprises a box body (101), a plurality of rows of storage grooves (103) are formed in the inner wall of the box body (101), limiting plates (104) are rotatably connected to the inner portions of the storage grooves (103), and second elastic pieces (105) are fixedly connected between the limiting plates (104) and the corresponding storage grooves (103).