CN110127166B

CN110127166B - Logistics tray

Info

Publication number: CN110127166B
Application number: CN201910503157.9A
Authority: CN
Inventors: 瞿磊
Original assignee: Individual
Current assignee: Changzhou TIANTI logistics equipment Co.,Ltd.
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-06-23
Anticipated expiration: 2039-06-12
Also published as: CN110127166A

Abstract

The invention provides a logistics tray, and belongs to the technical field of logistics equipment. It has solved the poor problem of current commodity circulation tray rotation goods back stability. This commodity circulation tray, including last disk body and lower disk body, it is connected with lower disk body rotation to go up the disk body, and the enough oscilaltion of disk body, annular guide way has been seted up to circumference on the lower disk body apical surface, a plurality of mounting grooves have been seted up to circumference on the bottom surface of guide way, all be provided with the tray in the mounting groove, all be equipped with the ball in the mounting groove, the side of going up of tray when the tray goes up can flush with the bottom surface of guide way, a plurality of spacing grooves have been seted up to circumference on the last disk body downside, and the maximum distance that abuts on time spacing groove bottom surface to the guide way bottom surface is less than the external diameter of ball when last disk body downside laminates with lower disk body apical surface mutually, still be equipped with the operating mechanism that can drive a. This commodity circulation tray is convenient more laborsaving when the adjustment goods orientation to guarantee the stability of goods after the adjustment targets in place.

Description

Logistics tray

Technical Field

The invention belongs to the technical field of logistics equipment, and relates to a logistics tray.

Background

The logistics pallet is a medium for converting static goods into dynamic goods, a cargo platform, and is a movable platform, or is a movable ground, even if the goods which lose flexibility are placed on the ground, the goods which are loaded on the logistics pallet can immediately obtain the mobility and become flexible flowing goods, because the goods loaded on the logistics pallet are in a preparation state which can be shifted to move at any time, the goods with larger weight are usually placed on the logistics pallet and are directly transferred into a boxcar through a forklift in the transportation process, however, the boxing of the boxcar is particularly important, the reasonable and orderly boxing can improve the loading capacity of the boxcar, and the goods on the logistics pallet can have irregular shapes, so that the orientation of the goods is sometimes required to be rotated in order to fully utilize the boxcar, but the weight is larger after the logistics pallet is placed in the boxcar, the rotary pallet for logistics in the Chinese patent application (application number: 201721769417.X) comprises a base, wherein a fixing lock is arranged on the left surface of the base, a lower cover plate is arranged on the upper surface of the base, a roller is arranged on the upper surface of the lower cover plate, an upper cover plate is arranged on the upper surface of the roller, and a main rotating shaft is arranged in the middle of the upper surface of the base; the original tray is reformed into two parts of a base and a carrying plate, the base and the carrying plate are fixedly connected by a main rotating shaft, an upper cover plate and a lower cover plate are arranged outside the main rotating shaft, the upper cover plate and the lower cover plate are connected by a roller in a rolling way, the carrying plate is supported on the premise of ensuring that the rotation of the carrying plate is not hindered, a side baffle and a positive baffle are arranged around the carrying plate, the side baffle and the positive baffle are fixedly connected by a bolt, an object is enclosed in the middle, the object is prevented from falling off when moving, the carrying plate of the tray can rotate relative to the base, but in order to reduce the rotation resistance of the carrying plate, the lower side surface of the carrying plate and the upper side surface of the base always have a gap, namely the carrying plate is always supported by the roller, so that the carrying plate and the base are both stressed by the position against the roller, the lifting device has the advantages that the stress area is small, the pressure intensity is high, the carrying plate and the base are easy to damage in the long-term use process, the carrying plate and the base are locked in the circumferential direction through the fixing lock, the weight of goods on the tray is huge, the carrying plate can receive large circumferential steering force in the transportation bumping process even in the carriage inclining process, the stability is poor through the fixing lock, and the lifting device is easy to damage in the long-term use process.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a logistics tray which is more convenient and labor-saving in the process of adjusting the orientation of goods and ensures the stability of the goods after being adjusted in place.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a logistics tray, includes upper disc body and lower disc body, the upper disc body is located the top of lower disc body, and the upper disc body rotates with lower disc body to be connected, a serial communication port, the upper disc body can the oscilaltion, and can support when the upper disc body descends and lean on the lower disc body facing upward, annular guide way has been seted up to circumference on the lower disc body facing upward, a plurality of mounting grooves have been seted up to circumference on the bottom surface of guide way, and a plurality of mounting groove circumference equipartitions, it is provided with the tray all to follow vertical slip in the mounting groove, all be equipped with the ball in the mounting groove, and the ball is located the tray top, works as the side of going up of tray during the rising can flush with the bottom surface of guide way, and the ball can roll to the guide way in, circumference is seted up a plurality of spacing grooves that are used for ball upper portion to support when the tray rising on the downside of upper disc body, and the maximum distance that the side of upper disc body was laminated mutually The outer diameter of the ball, still be equipped with the operating mechanism that can drive a plurality of tray synchronous lifting on the lower plate body.

The goods are placed on the upper tray body, the lower side surface of the upper tray body is attached and pressed with the upper side surface of the lower tray body under the heavy pressure of the goods, so that the goods are kept stable, the supporting block is in a descending state, the balls are positioned in the mounting grooves and separated from the limiting grooves of the upper tray body, when the orientation of the goods needs to be adjusted, the supporting block synchronously ascends through the operating mechanism, the balls are gradually abutted against the walls of the limiting grooves and upwards lift the upper tray body until the upper side surface of the supporting block is flush with the bottom surface of the guide grooves, a gap is formed between the lower side surface of the upper tray body and the upper side surface of the lower tray body, the limiting grooves can drive the balls to roll along the guide grooves when the upper tray body is rotated until the balls roll into the corresponding mounting grooves, then the supporting block is driven by the operating mechanism to descend until the lower side surface of the upper tray body is attached and pressed with the upper side surface of the, form the clearance between last disk body and the lower disk body, the rolling friction of ball in the guide way is less for the rotation of goods is convenient laborsaving more, and goes up the disk body downside and can laminate and support and press on the lower disk body side after the adjustment finishes, makes the goods remain stable.

In foretell commodity circulation tray, seted up a plurality of constant head tanks on the last side of lower disk body, this a plurality of constant head tanks encircle guide way circumference equipartition, have a plurality of location lugs corresponding with the constant head tank on the downside of going up the disk body, and a plurality of location lugs are pegged graft respectively in a plurality of constant head tanks when the downside of going up the disk body leans on with the side counterbalance of going up of lower disk body, work as the spacing groove of going up the disk body when the location lug is pegged graft in the constant head tank is relative with the ball in the mounting groove. The locating lug is pegged graft and is fixed a position promptly and make the upper tray body can descend the time the ball must be located the mounting groove in the constant head tank to make the upper tray body go up and down smoothly, the locating piece can fix a position the upper tray body after the upper tray body descends simultaneously, avoids the transportation jolt in-process the upper tray body appear that upwards rotation in the circumference leads to spacing groove and ball to stagger.

In foretell commodity circulation tray, vertically on the bottom surface of mounting groove link firmly a plurality of spacing posts, the up end terminal surface of these a plurality of spacing posts flushes with the bottom surface of guide way, and is a plurality of spacing post circumference equipartition, and a plurality of spacing posts encircle the spacing groove setting of top when the locating lug is pegged graft in the constant head tank, a plurality of through holes have been seted up to circumference on the tray, and is a plurality of spacing post slides respectively and pegs graft in a plurality of through holes, and the upper end of spacing post all stretches out the tray upper flank when the tray descends, and the ball is located a plurality of spacing post inboardly. Spacing post can lead the lift of tray, and a plurality of spacing posts enclose the ball when the tray descends simultaneously, can carry on spacingly to the ball, avoids the ball to roll in the mounting groove to lead to staggering with the spacing groove, and rises to the up end of leading to the side and the guide way bottom surface when the tray when level, and the side of going up of tray flushes with the up end of spacing post equally, and spacing post can not produce the rolling of ball and interfere.

In foretell commodity circulation tray, still circumference has seted up a plurality of spouts on the last side of lower disk body, and this a plurality of spouts all follow the radial setting of guide way, a plurality of spouts and a plurality of mounting groove one-to-one, and the inner and the mounting groove of spout are linked together, all slide in the spout and be provided with the ejector pad, the bottom of tray has the top and pushes away inclined plane one, and pushes away inclined plane one and upwards slope towards one side of ejector pad, the ejector pad has top and pushes away inclined plane two towards one side downward sloping of tray towards the one end of tray, works as the ejector pad pushes away inclined plane two and can act on top and push away the tray upwards in the lump when radially inwards sliding, set up a plurality of dodging grooves that are used for dodging the spacing post when the ejector pad inwards slides on the ejector pad, operating mechanism can drive the ejector pad and slide. The operating mechanism can synchronously push the push block inwards, the push block can push the first push inclined plane of the support block through the second push inclined plane, so that the support block rises, the push block can be supported below the support block when the support block rises in place, and the support block can gradually descend under the heavy pressure of goods when the push block synchronously moves outwards until the push block is pressed on the bottom surface of the mounting groove.

In the above logistics tray, the operating mechanism includes a pushing ring, an annular groove is circumferentially provided on the upper side surface of the lower tray body, the annular groove and the guide groove have the same central line, the outer ends of the plurality of sliding grooves are all communicated with the annular groove, the pushing ring is rotatably provided in the annular groove, the support block and the pushing block are both located on the inner side of the pushing ring, a plurality of pushing convex parts are circumferentially provided on the inner peripheral surface of the pushing ring, the plurality of pushing convex parts are in one-to-one correspondence with the plurality of pushing blocks, the pushing convex parts are in a strip shape and are arranged along the circumferential direction of the pushing ring, a third pushing inclined surface is provided at one end of the pushing convex part, the higher end of the third pushing inclined surface is connected with the inner side surface of the pushing convex part, the lower end of the third pushing inclined surface is connected with the inner peripheral surface of the pushing ring, when the outer end of the pushing block abuts, when the outer end of the push block abuts against the inner side surface of the pushing convex part, the support block rises, the upper side surface of the support block is flush with the bottom surface of the guide groove, and the control mechanism further comprises a control shaft which can drive the pushing ring to rotate so that the pushing inclined surface pushes the push block inwards. When the upper tray body needs to be rotated, the pushing ring is driven to rotate through the control shaft, the third pushing inclined plane on the pushing convex part can abut against the outer end of the pushing block and gradually push the pushing block inwards along the radial direction until the outer end of the pushing block abuts against the inner side surface of the pushing convex part, the upper side surface of the supporting block is flush with the bottom surface of the guide groove at the moment, the pushing ring supports the pushing block, and after the orientation of the goods is adjusted, the pushing ring is driven to reversely rotate through the control shaft, so that the pushing convex part is gradually separated from the pushing block.

In the logistics tray, the second pushing inclined plane is rotatably connected with a plurality of pushing rollers, the bottom surface of the pushing block is rotatably connected with a plurality of supporting rollers, the length directions of the plurality of pushing rollers and the plurality of supporting rollers are all arranged along the width direction of the pushing block, the supporting rollers are all abutted against the bottom surface of the sliding groove, when the pushing block slides inwards, the first pushing inclined plane can be pushed by the pushing rollers, the outer end of the pushing block is provided with a fourth pushing inclined plane which is adaptive to the three-phase pushing inclined plane, the fourth pushing inclined plane is rotatably connected with a plurality of vertical rollers which are vertically arranged, and when the pushing ring rotates, the third pushing inclined plane can push the vertical rollers. The push block abuts against the bottom surface of the sliding groove through the supporting roller, the push block can abut against the first push inclined surface of the supporting block through the first push roller when pushing the supporting block, the third push inclined surface on the same push convex part abuts against the vertical roller of the push block, and at the moment, rolling friction is formed between the push convex part and the push block, between the push block and the bottom surface of the sliding groove and between the push block and the supporting block, so that the operation is more labor-saving and smooth.

In the logistics tray, the control mechanism further comprises a worm wheel and a worm, a rectangular groove is further formed in the upper side face of the lower tray body, one side of the rectangular groove is communicated with the annular groove, the worm is connected in the rectangular groove in a rotating mode, a central hole is formed in the worm wheel, the pushing ring is fixed on the inner peripheral wall of the worm wheel, the worm wheel is meshed with the worm, two through holes are further formed in the lower tray body, the inner ends of the two through holes are respectively communicated with the two ends of the rectangular groove, the outer ends of the two through holes respectively penetrate through the two opposite side faces of the lower tray body, the two control shafts are respectively connected in an inserting mode in the two through holes in a rotating mode, the inner ends of the two control shafts are respectively fixedly connected with the two ends of the worm, and inner hexagonal holes are formed in the outer. The hexagonal socket makes things convenient for the spanner to operate, drives the worm through rotating the control shaft and rotates, and the worm drives the worm wheel and rotates, and wherein the worm wheel is more laborsaving with the worm cooperation, and can realize the auto-lock after targetting in place.

In the above logistics tray, the lower side surfaces of the positioning lugs are provided with avoidance concave cavities, the inner wall of the port of each avoidance concave cavity is circumferentially provided with a first abutting convex edge, the avoidance concave cavities are internally provided with strip-shaped elastic pieces and limiting blocks, the bottom surface of each avoidance concave cavity is provided with a strip-shaped groove, two ends of each elastic piece are respectively connected in the strip-shaped grooves in a sliding manner, the middle parts of the elastic pieces are arched downwards in an arc shape and abut against the upper side surface of each limiting block, the outer edges of the upper parts of the limiting blocks are circumferentially provided with second abutting convex edges, the second abutting convex edges are positioned between the bottom surface of each avoidance concave cavity and the first abutting convex edges, the corners of the lower parts of the limiting blocks are provided with arc chamfers, under the elastic action of the elastic pieces, the limiting blocks can abut against the upper side surface of the lower tray body when the upper tray body ascends and rotates, the second abutting, the lower tray body all is equipped with the locking piece that can lock the locating convex block when the locating convex block inserts the constant head tank in constant head tank department. The positioning block can be positioned in the positioning groove, the positioning block can be separated from the positioning groove when the upper tray body ascends, the lower side surface of the limiting block is still lower than the upper side surface of the upper tray body after the upper tray body ascends to the position, the limiting block can compress the elastic sheet to ascend through the action of the arc-shaped chamfer and the corner of the positioning groove when the upper tray body rotates, therefore, the lower side surface of the limiting block always supports against the upper side surface of the lower tray body and slides relatively in the rotating process of the upper tray body, the limiting block can be separated from the upper side surface of the lower tray body and falls into the positioning groove when the upper tray body rotates to the position, the supporting convex edge II on the limiting block can impact the supporting convex edge I to make a sound, thereby reminding a worker that the positioning block is aligned with the positioning groove, the ball is also positioned in the mounting groove, the descending operation of, thereby avoiding the lower tray body and the upper tray body from separating when the upper tray body is supported by the forklift.

In foretell commodity circulation tray, the locking piece includes the lockplate, one side of constant head tank all is linked together with the ring channel, the draw-in groove has been seted up on the side of location lug orientation ring channel, the both sides of lockplate are along all having the hinge post, and the hinge post articulates on the constant head tank cell wall, the lockplate has the fixture block towards the side upper end of constant head tank, the cover is equipped with the locking torsional spring on the hinge post, the fixture block can the joint in the draw-in groove under the effect of locking torsional spring, the lockplate has the bar convex part towards the side lower extreme of ring channel, circumference has a plurality of unblock convex parts on the outer peripheral face of top throw ring, the unblock convex part is rectangular form, and the one end of unblock convex part has top and pushes away five, and this top pushes away the higher one end of five inclined planes and is connected with the lateral surface of unblock convex part, lower one end is connected When the strip-shaped convex part abuts against the fifth pushing inclined surface, the outer end of the pushing block also abuts against the inner circumferential surface of the pushing ring, when the outer end of the pushing block abuts against the three phases of the pushing inclined surfaces, the strip-shaped convex part abuts against the outer side surface of the unlocking convex part, when the outer end of the pushing block abuts against the inner circumferential surface of the pushing inclined surface, the strip-shaped convex part also abuts against the outer side surface of the unlocking convex part, and the clamping block is separated from the clamping groove. When the positioning block is positioned in the positioning groove, a clamping block on the locking plate can be clamped in a clamping groove of the positioning block so as to lock the positioning block, the pushing ring is rotated when the upper tray body needs to be lifted, the unlocking convex part is gradually close to the strip-shaped convex part, the strip-shaped convex part is pushed by the pushing inclined surface until the strip-shaped convex part is abutted against the outer side surface of the unlocking convex part, at the moment, the clamping block is separated from the clamping groove so as to release the locking of the positioning block, the pushing blocks are abutted against the inner peripheral surface of the pushing ring in the process, namely, the pushing convex part is not contacted with the pushing block, the upper tray body cannot lift up before the locking plate is released, and along with the continuous rotation of the pushing ring, the outer side surface of the unlocking convex part is always abutted against the strip-shaped convex part, namely, the clamping block is always separated from, when the pushing ring rotates reversely, the upper disc body descends firstly, then the clamping block is clamped into the clamping groove, namely the unlocking of the positioning block by the locking plate and the ascending of the upper disc body are controlled by the pushing ring, so that the unlocking sequence of the locking plate and the ascending sequence of the upper disc body are ensured, and the structural damage caused by the forced ascending of the upper disc body without unlocking is avoided.

In foretell commodity circulation tray, the discoid connecting seat has on the hanging wall body downside, the lower extreme outer fringe circumference of connecting seat has spacing protruding edge, the connecting hole has been seted up on the lower disk body, the lower extreme drill way circumference of connecting hole has the concave shoulder, the connecting seat is pegged graft in the connecting hole, and spacing protruding edge is located the concave shoulder, and has the clearance between spacing protruding edge top surface and the concave shoulder bottom surface when the top wall body downside offsets with the lower disk body top surface, still linked firmly the bottom in the concave shoulder. The discoid connecting seat makes and has stable rotation connection relation between last disk body and the lower disk body, and the concave shoulder is used for the removal of the spacing protruding edge of last disk body lift in-process, and the foreign matter can be avoided in the setting of bottom to the lift production influence of last disk body.

Compared with the prior art, this commodity circulation tray has following advantage:

1. because the upper tray body supports through a plurality of balls in the rotating process, a gap is formed between the upper tray body and the lower tray body, the rolling friction of the balls in the guide groove is small, the rotation of goods is more convenient and labor-saving, and the lower side face of the upper tray body can be attached to and pressed on the upper side face of the lower tray body after the adjustment is finished, so that the goods are kept stable.

2. Because the locating piece can fix a position the hanging wall body after last disk body descends, avoid the transportation jolt in-process the upper plate body appear the ascending rotation in circumference and lead to spacing groove and ball to stagger, and the locking piece can lock the locating piece to avoid fork truck lower disk body and hanging wall body separation when supporting the hanging wall body.

3. Because the unlocking of the locking plate on the positioning block and the rising of the upper disc body are controlled by the pushing ring, the sequence of unlocking the locking plate and the rising of the upper disc body is ensured, and the structural damage caused by the forced rising of the upper disc body without unlocking is avoided.

Drawings

Fig. 1 is a schematic perspective view of a logistics tray.

Fig. 2 is a schematic perspective view of the lower tray.

Fig. 3 is an enlarged view of the structure at a in fig. 2.

Fig. 4 is a structural plan view of the logistics tray.

Fig. 5 is a sectional view of the structure at B-B in fig. 4.

Fig. 6 is an enlarged view of the structure at C in fig. 5.

Fig. 7 is a partial sectional view of the upper plate body when it is raised.

Fig. 8 is a structural plan view of the lower tray.

Fig. 9 is an enlarged view of the structure at D in fig. 8.

Fig. 10 is a cross-sectional view of the structure at E-E in fig. 4.

Fig. 11 is an enlarged view of the structure at F in fig. 10.

Fig. 12 is an enlarged view of the structure at G in fig. 2.

Fig. 13 is an enlarged view of the structure at H in fig. 8.

Fig. 14 is a perspective view of the upper tray body.

Fig. 15 is an enlarged view of the structure at I in fig. 14.

In the figure, 1, an upper disc body; 11. a limiting groove; 12. positioning the bump; 121. avoiding the concave cavity; 122. the first convex edge is abutted; 123. a strip-shaped groove; 124. an elastic sheet; 125. a limiting block; 126. the second convex edge is abutted; 127. a card slot; 13. a connecting seat; 131. a limiting convex edge; 2. a lower tray body; 21. a guide groove; 22. mounting grooves; 221. a limiting column; 23. a chute; 24. an annular groove; 25. a rectangular groove; 26. positioning a groove; 27. connecting holes; 271. a concave shoulder; 3. a support block; 31. a through hole; 32. pushing the inclined plane I; 4. a push block; 41. pushing the inclined plane II; 42. an avoidance groove; 43. pushing the roller; 44. supporting the rollers; 45. pushing the inclined plane IV; 46. a vertical roller; 5. pushing the ring; 51. pushing the convex part; 511. pushing the inclined plane III; 52. a worm gear; 53. an unlocking protrusion; 531. pushing the inclined plane five; 6. a worm; 61. a steering shaft; 7. a locking plate; 71. a clamping block; 72. locking the torsion spring; 73. a strip-shaped convex part; 8. a ball bearing; 9. a bottom cover.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in figure 1, a logistics tray comprises an upper tray body 1 and a lower tray body 2, wherein the upper tray body 1 is positioned above the lower tray body 2, the upper tray body 1 is rotatably connected with the lower tray body 2, the upper tray body 1 can be lifted up and down and can be abutted against the upper side surface of the lower tray body 2 when the upper tray body 1 descends, as shown in figures 2 and 3, an annular guide groove 21 is circumferentially arranged on the upper side surface of the lower tray body 2, a plurality of mounting grooves 22 are circumferentially arranged on the bottom surface of the guide groove 21 and are circumferentially and uniformly distributed, supporting blocks 3 are vertically and slidably arranged in the mounting grooves 22, balls 8 are arranged in the mounting grooves 22, the balls 8 are positioned above the supporting blocks 3, when the supporting blocks 3 ascend, the upper side surface of the supporting blocks 3 can be flush with the bottom surface of the guide groove 21, the balls 8 can roll into the guide grooves 21, a plurality of limiting grooves 11 for abutting against the upper portions of the balls 8 when the supporting blocks 3 ascend are circumferentially arranged on the lower side surface of, when the lower side surface of the upper tray body 1 is attached to and abutted against the upper side surface of the lower tray body 2, the maximum distance from the bottom surface of the limiting groove 11 to the bottom surface of the guide groove 21 is smaller than the outer diameter of the ball 8, and the lower tray body 2 is further provided with an operating mechanism capable of driving the plurality of support blocks 3 to synchronously lift. Referring to fig. 4, 5, 6 and 7, goods are placed on the upper tray body 1, the lower side surface of the upper tray body 1 is attached and pressed with the upper side surface of the lower tray body 2 under the heavy pressure of the goods, so that the goods are kept stable, the supporting block 3 is in a descending state at the moment, the balls 8 are positioned in the mounting grooves 22 and separated from the limiting grooves 11 of the upper tray body 1, when the orientation of the goods needs to be adjusted, the supporting block 3 is synchronously lifted up through the operating mechanism, the balls 8 are gradually abutted against the groove walls of the limiting grooves 11 and lift the upper tray body 1 upwards until the upper side surface of the supporting block 3 is flush with the bottom surface of the guide grooves 21, a gap is formed between the lower side surface of the upper tray body 1 and the upper side surface of the lower tray body 2 at the moment, the limiting grooves 11 can drive the balls 8 to roll along the guide grooves 21 when the upper tray body 1 is rotated until the balls 8 roll into the corresponding mounting grooves, until 1 downside of last disk body support with 2 side laminating on the lower disk body again and press, thereby realize the orientation adjustment of goods, because the middle and upper disk body 1 supports through a plurality of balls 8 in the rotation process, form the clearance between the upper disk body 1 and the lower disk body 2, the rolling friction of ball 8 in guide way 21 is less, make the rotation of goods convenient more laborsaving, and after the adjustment finishes, 1 downside of last disk body can laminate and support and press on 2 sides of lower disk body, make the goods remain stable.

The bottom surface of the mounting groove 22 is vertically fixedly connected with a plurality of limiting columns 221, the upper end surfaces of the limiting columns 221 are flush with the bottom surface of the guide groove 21, the limiting columns 221 are circumferentially and uniformly distributed, the limiting columns 221 are arranged around the limiting groove 11 above when the positioning lug 12 is inserted in the positioning groove 26, the supporting block 3 is circumferentially provided with a plurality of through holes 31, the limiting columns 221 are respectively inserted in the through holes 31 in a sliding manner, the upper ends of the limiting columns 221 extend out of the upper side surface of the supporting block 3 when the supporting block 3 descends, the rolling balls 8 are positioned at the inner sides of the limiting columns 221, the limiting columns 221 can guide the ascending and descending of the supporting block 3, the rolling balls 8 are surrounded by the limiting columns 221 when the supporting block 3 descends, the rolling balls 8 are prevented from rolling in the mounting groove 22 and being staggered with the limiting groove 11, and when the supporting block 3 ascends until the upper side surface is flush with the bottom surface of the guide groove 21, the upper side surface of the holding block 3 is also flush with the upper end surface of the limiting column 221, and the limiting column 221 cannot interfere with the rolling of the ball 8. The upper side surface of the lower tray body 2 is also circumferentially provided with a plurality of sliding grooves 23, the plurality of sliding grooves 23 are all arranged along the radial direction of the guide groove 21, the plurality of sliding grooves 23 correspond to the plurality of mounting grooves 22 one by one, the inner ends of the sliding grooves 23 are communicated with the mounting grooves 22, the sliding grooves 23 are internally provided with pushing blocks 4 in a sliding manner, the bottom of the supporting block 3 is provided with a pushing inclined surface I32, the pushing inclined surface I32 inclines upwards towards one side of the pushing block 4, one end of the pushing block 4 towards the supporting block 3 is provided with a pushing inclined surface II 41, the pushing inclined surface II 41 inclines downwards towards one side of the supporting block 3, when the pushing block 4 slides inwards along the radial direction, the pushing inclined surface II 41 can act on the pushing inclined surface I32 and push the supporting block 3 upwards, the pushing block 4 is provided with a plurality of avoiding grooves 42 which are used for avoiding the limiting column 221 when the pushing block 4 slides inwards, the, the pushing block 4 can push the first pushing inclined surface 32 of the supporting block 3 through the second pushing inclined surface 41, so that the supporting block 3 rises, the pushing block 4 can be supported below the supporting block 3 when the supporting block 3 rises to the right position, and the supporting block 3 can gradually descend under the heavy pressure of goods when the pushing block 4 synchronously moves outwards until the supporting block is pressed on the bottom surface of the installation groove 22.

Referring to fig. 8 and 9, the operating mechanism includes a pushing ring 5, an annular groove 24 is circumferentially formed on the upper side surface of the lower tray body 2, the annular groove 24 and the guide groove 21 have the same central line, the outer ends of the sliding grooves 23 are all communicated with the annular groove 24, the pushing ring 5 is rotatably disposed in the annular groove 24, the support block 3 and the pushing block 4 are both located on the inner side of the pushing ring 5, a plurality of pushing protrusions 51 are circumferentially disposed on the inner circumferential surface of the pushing ring 5, the plurality of pushing protrusions 51 are in one-to-one correspondence with the plurality of pushing blocks 4, the pushing protrusions 51 are strip-shaped and are disposed along the circumferential direction of the pushing ring 5, one end of each pushing protrusion 51 is provided with a third pushing inclined surface 511, the higher end of the third pushing inclined surface 511 is connected with the inner circumferential surface of the pushing protrusion 51, the lower end of the third pushing inclined surface 511 is connected with the inner circumferential surface of the pushing ring 5, when the outer end of the pushing block 4 abuts against the inner circumferential, when the outer end of the pushing block 4 abuts against the inner side surface of the pushing convex part 51, the supporting block 3 rises, the upper side surface of the supporting block 3 is flush with the bottom surface of the guide groove 21, the operating mechanism further comprises an operating shaft 61 capable of driving the pushing ring 5 to rotate so that the pushing inclined surface III 511 pushes the pushing block 4 inwards, when the upper tray body 1 needs to be rotated, the pushing ring 5 is driven to rotate through the operating shaft 61, the pushing inclined surface III 511 on the pushing convex part 51 can abut against the outer end of the pushing block 4 and gradually push the pushing block 4 inwards along the radial direction until the outer end of the pushing block 4 abuts against the inner side surface of the pushing convex part 51, at the moment, the upper side surface of the supporting block 3 is flush with the bottom surface of the guide groove 21, the pushing ring 5 supports the pushing block 4, and after the orientation adjustment of the goods is finished, the pushing ring 5 is driven to reversely rotate through the operating shaft 61, so that the. The second pushing inclined plane 41 is rotatably connected with a plurality of pushing rollers 43, the bottom surface of the pushing block 4 is rotatably connected with a plurality of supporting rollers 44, the length directions of the plurality of pushing rollers 43 and the plurality of supporting rollers 44 are all arranged along the width direction of the pushing block 4, the supporting rollers 44 are all abutted against the bottom surface of the chute 23, when the pushing block 4 slides inwards, the pushing rollers 43 can push the first pushing inclined plane 32, the outer end of the pushing block 4 is provided with a fourth pushing inclined plane 45 matched with the third pushing inclined plane 511, the fourth pushing inclined plane 45 is rotatably connected with a plurality of vertical rollers 46 arranged vertically, when the pushing ring 5 rotates, the third pushing inclined plane 511 can push the vertical rollers 46, the pushing block 4 is abutted against the bottom surface of the chute 23 through the supporting rollers 44, when the pushing block 3 is pushed, the third pushing inclined plane 511 on the pushing convex part 51 can be abutted against the vertical rollers 46 of the pushing block 4, at this time, rolling friction is generated between the pushing convex part 51 and the pushing block 4, between the pushing block 4 and the bottom surface of the chute 23, and between the pushing block 4 and the supporting block 3, so that the operation is more labor-saving and smooth due to the operation resistance. The control mechanism further comprises a worm wheel 52 and a worm 6, the upper side surface of the lower disc body 2 is further provided with a rectangular groove 25, one side of the rectangular groove 25 is communicated with the annular groove 24, the worm 6 is rotatably connected in the rectangular groove 25, the worm wheel 52 is provided with a central hole, the pushing ring 5 is fixed on the inner peripheral wall of the worm wheel 52, the worm wheel 52 is meshed with the worm 6, the lower disc body 2 is further provided with two through holes, the inner ends of the two through holes are respectively communicated with two ends of the rectangular groove 25, the outer ends of the two through holes respectively penetrate through two opposite side surfaces of the lower disc body 2, the two control shafts 61 are respectively rotatably inserted in the two through holes, the inner ends of the two control shafts 61 are respectively fixedly connected with two ends of the worm 6, the outer ends of the two control shafts 61 are both provided with inner hexagonal holes, the inner hexagonal holes are convenient for a wrench to operate, and the worm 6 is driven to rotate, the worm 6 drives the worm wheel 52 to rotate, wherein the worm wheel 52 is more labor-saving in matching with the worm 6, and self-locking can be realized after the worm wheel is in place.

Referring to fig. 10 and 11, a plurality of positioning grooves 26 are formed on the upper side surface of the lower disc 2, the positioning grooves 26 are evenly distributed around the circumference of the guide groove 21, the lower side surface of the upper tray body 1 is provided with a plurality of positioning lugs 12 corresponding to the positioning grooves 26, and when the lower side surface of the upper tray body 1 is abutted against the upper side surface of the lower tray body 2, the plurality of positioning lugs 12 are respectively inserted into the plurality of positioning grooves 26, when the positioning lug 12 is inserted into the positioning slot 26, the limiting slot 11 of the upper tray body 1 is opposite to the ball 8 in the mounting slot 22, namely, when the positioning lug 12 is inserted and positioned in the positioning groove 26 so that the upper disc body 1 can descend, the ball 8 is necessarily positioned in the mounting groove 22, thereby make upper plate body 1 go up and down smoothly, the locating piece can fix a position upper plate body 1 after upper plate body 1 descends simultaneously, avoids transportation jolt in-process upper plate body 1 appear the ascending rotation in circumference and lead to spacing groove 11 and ball 8 to stagger. The lower side surfaces of the positioning convex blocks 12 are respectively provided with an avoiding concave cavity 121, the inner wall of the port of the avoiding concave cavity 121 is circumferentially provided with a first abutting convex edge 122, the avoiding concave cavity 121 is internally provided with a strip-shaped elastic sheet 124 and a limiting block 125, the bottom surface of the avoiding concave cavity 121 is provided with a strip-shaped groove 123, two ends of the elastic sheet 124 are respectively connected in the strip-shaped groove 123 in a sliding manner, the middle part of the elastic sheet 124 is arched downwards in an arc manner and abuts against the upper side surface of the limiting block 125, the outer edge of the upper part of the limiting block 125 is circumferentially provided with a second abutting convex edge 126, the second abutting convex edge 126 is positioned between the bottom surface of the avoiding concave cavity 121 and the first abutting convex edge 122, the lower corner of the limiting block 125 is provided with an arc chamfer, under the elastic action of the elastic sheet 124, the limiting block 125 can abut against the upper side surface of the lower tray body 2 when the upper tray body 1, the lower tray body 2 is provided with locking pieces which can lock the positioning lugs 12 when the positioning lugs 12 are inserted into the positioning slots 26 at the positioning slots 26, the positioning pieces can be positioned in the positioning slots 26, the positioning pieces can be separated from the positioning slots 26 when the upper tray body 1 rises to a certain position, the lower side surface of the limiting block 125 is still lower than the upper side surface of the upper tray body 1 after the upper tray body 1 rises to a certain position, the limiting block 125 can compress the elastic sheet 124 to rise through the action of an arc chamfer and the corner of the positioning slots 26 when the upper tray body 1 rotates, therefore, the lower side surface of the limiting block 125 is always pressed against the upper side surface of the lower tray body 2 and slides relatively during the rotation process of the upper tray body 1, the limiting block 125 can be separated from the upper side surface of the lower tray body 2 and fall into the positioning slots 26 when the upper tray body 1 rotates to a certain position, at the moment, the two abutting, the ball 8 is also located in the mounting groove 22, so that the descending operation of the upper tray body 1 can be performed, the misoperation is avoided, the locking piece can lock the positioning block when the upper tray body 1 is pressed on the lower tray body 2, and the lower tray body 2 is prevented from being separated from the upper tray body 1 when the upper tray body 1 is lifted by a forklift. Referring to fig. 12 to 15, the locking member includes a locking plate 7, one side of the positioning groove 26 is communicated with the annular groove 24, a side of the positioning protrusion 12 facing the annular groove 24 is provided with a locking groove 127, both edges of the locking plate 7 are provided with hinge columns hinged to the groove wall of the positioning groove 26, the upper end of the side of the locking plate 7 facing the positioning groove 26 is provided with a locking block 71, the hinge columns are sleeved with a locking torsion spring 72, the locking block 71 can be clamped in the locking groove 127 under the action of the locking torsion spring 72, the lower end of the side of the locking plate 7 facing the annular groove 24 is provided with a strip-shaped convex portion 73, the outer circumferential surface of the pushing ring 5 is provided with a plurality of unlocking convex portions 53 in circumferential direction, the unlocking convex portions 53 are in strip shape, one end of the unlocking convex portions 53 is provided with a pushing inclined surface five 531, the higher end, when the strip-shaped convex part 73 abuts against the outer peripheral surface of the pushing ring 5, the outer end of the pushing block 4 abuts against the inner peripheral surface of the pushing ring 5, when the strip-shaped convex part 73 abuts against the fifth pushing inclined surface 531, the outer end of the pushing block 4 also abuts against the inner peripheral surface of the pushing ring 5, when the outer end of the pushing block 4 abuts against the third pushing inclined surface 511, the strip-shaped convex part 73 abuts against the outer side surface of the unlocking convex part 53, when the outer end of the pushing block 4 abuts against the inner peripheral surface of the pushing convex part 51, the strip-shaped convex part 73 also abuts against the outer side surface of the unlocking convex part 53, the fixture block 71 is separated from the fixture groove 127, when the positioning block is positioned in the positioning groove 26, the fixture block 71 on the locking plate 7 can be clamped in the fixture groove 127 of the positioning block, so as to lock the positioning block, when the upper tray body 1 needs to be lifted, the pushing ring 5 is rotated, until the strip-shaped convex part 73 is abutted against the outer side surface of the unlocking convex part 53, the fixture block 71 is separated from the clamping groove 127 to unlock the positioning block, the push block 4 is abutted against the inner circumferential surface of the push ring 5 in the process, namely the push convex part 51 is not contacted with the push block 4, the upper disc body 1 cannot ascend before the locking block 7 is unlocked, along with the continuous rotation of the push ring 5, the outer side surface of the unlocking convex part 53 is always abutted against the strip-shaped convex part 73, namely the fixture block 71 is always separated from the clamping groove 127, the push convex part 51 is gradually abutted against the push block 4 and pushes the convex block, so that the upper disc body 1 ascends in the unlocking state of the locking plate 7, similarly, the upper disc body 1 descends firstly when the push ring 5 rotates reversely, then the fixture block 71 is clamped into the clamping groove 127, namely the unlocking of the positioning block by the locking plate 7 and the ascending of the upper disc body 1 are controlled by the push ring 5, so that the unlocking, the structure damage caused by forced rising of the upper tray body 1 without unlocking is avoided. Have discoid connecting seat 13 on 1 downside of upper disc body, the lower extreme outer fringe of connecting seat 13 has spacing protruding edge 131 along circumference, connecting hole 27 has been seted up on the lower disc body 2, the lower extreme drill way circumference of connecting hole 27 has concave shoulder 271, connecting seat 13 pegs graft in connecting hole 27, and spacing protruding edge 131 is located concave shoulder 271, and spacing protruding edge 131 has the clearance between the side and the concave shoulder 271 bottom surface when the downside of upper disc body 1 offsets with 2 upside of lower disc body, still linked firmly bottom 9 in the concave shoulder 271, discoid connecting seat 13 makes and has stable rotation connection relation between upper disc body 1 and the lower disc body 2, and concave shoulder 271 is used for the removal of spacing protruding edge 131 of 1 lift in-process of upper disc body, the setting of bottom 9 can avoid the foreign matter to produce the influence to the lift of upper disc body 1.

Claims

1. A logistics tray comprises an upper tray body (1) and a lower tray body (2), wherein the upper tray body (1) is positioned above the lower tray body (2), and the upper tray body (1) is rotatably connected with the lower tray body (2), and is characterized in that the upper tray body (1) can be lifted up and down and can be abutted against the upper side surface of the lower tray body (2) when the upper tray body (1) descends, an annular guide groove (21) is circumferentially arranged on the upper side surface of the lower tray body (2), a plurality of mounting grooves (22) are circumferentially arranged on the bottom surface of the guide groove (21) and are circumferentially and uniformly distributed, supporting blocks (3) are vertically and slidably arranged in the mounting grooves (22), rolling balls (8) are arranged in the mounting grooves (22), the rolling balls (8) are positioned above the supporting blocks (3), and when the supporting blocks (3) ascend, the upper side surface of the supporting blocks (3) can be flushed with the bottom surface of the guide groove (21), and ball (8) can roll to in guide way (21), circumference has seted up a plurality of spacing groove (11) that are used for ball (8) upper portion to support when tray (3) rise on the downside of going up disk body (1), and laminates mutually when going up disk body (1) downside and lower disk body (2) and support when spacing groove (11) bottom surface to guide way (21) bottom surface's the maximum distance be less than the external diameter of ball (8), still be equipped with the operating mechanism that can drive a plurality of tray (3) synchronous lifting down on lower disk body (2).

2. The logistics tray of claim 1, wherein the upper side of the lower tray body (2) is provided with a plurality of positioning grooves (26), the plurality of positioning grooves (26) are circumferentially and uniformly distributed around the guide groove (21), the lower side of the upper tray body (1) is provided with a plurality of positioning lugs (12) corresponding to the positioning grooves (26), the plurality of positioning lugs (12) are respectively inserted into the plurality of positioning grooves (26) when the lower side of the upper tray body (1) abuts against the upper side of the lower tray body (2), and the limiting grooves (11) of the upper tray body (1) are opposite to the balls (8) in the mounting grooves (22) when the positioning lugs (12) are inserted into the positioning grooves (26).

3. The logistics tray as claimed in claim 2, wherein the bottom surface of the mounting groove (22) is vertically and fixedly connected with a plurality of limiting columns (221), the upper end surfaces of the limiting columns (221) are flush with the bottom surface of the guide groove (21), the limiting columns (221) are circumferentially and uniformly distributed, the limiting columns (221) are arranged around the limiting groove (11) above when the positioning lug (12) is inserted into the positioning groove (26), the supporting block (3) is circumferentially provided with a plurality of through holes (31), the limiting columns (221) are respectively inserted into the through holes (31) in a sliding manner, when the supporting block (3) descends, the upper ends of the limiting columns (221) extend out of the upper side surface of the supporting block (3), and the rolling balls (8) are located on the inner sides of the limiting columns (221).

4. The logistics tray as claimed in claim 3, wherein the upper side surface of the lower tray body (2) is further provided with a plurality of sliding grooves (23) in a circumferential direction, the plurality of sliding grooves (23) are all arranged along the radial direction of the guide groove (21), the plurality of sliding grooves (23) correspond to the plurality of mounting grooves (22) one by one, the inner ends of the sliding grooves (23) are communicated with the mounting grooves (22), the sliding grooves (23) are internally provided with the push blocks (4) in a sliding manner, the bottom of the support block (3) is provided with the first pushing inclined surface (32), one side, facing the push block (4), of the first pushing inclined surface (32) is inclined upwards, one end, facing the support block (3), of the push block (4) is provided with the second pushing inclined surface (41), the second pushing inclined surface (41) is inclined downwards facing one side of the support block (3), when the push block (4) slides inwards in the radial direction, the second pushing inclined surface (41) can act on the first pushing inclined surface (, the pushing block (4) is provided with a plurality of avoiding grooves (42) used for avoiding the limiting columns (221) when the pushing block (4) slides inwards, and the operating mechanism can drive the pushing block (4) to slide.

5. The logistics tray of claim 4, wherein the operating mechanism comprises a pushing ring (5), an annular groove (24) is circumferentially formed on the upper side surface of the lower tray body (2), the annular groove (24) and the guide groove (21) have the same center line, the outer ends of the sliding grooves (23) are communicated with the annular groove (24), the pushing ring (5) is rotatably arranged in the annular groove (24), the supporting block (3) and the pushing block (4) are both positioned on the inner side of the pushing ring (5), a plurality of pushing convex parts (51) are circumferentially arranged on the inner circumferential surface of the pushing ring (5), the plurality of pushing convex parts (51) are in one-to-one correspondence with the plurality of pushing blocks (4), the pushing convex parts (51) are in a strip shape and are arranged along the circumferential direction of the pushing ring (5), a pushing inclined surface III (511) is arranged at one end of each pushing convex part (51), and the higher end of each pushing inclined surface III (511) is connected with the inner side surface of each pushing convex part (51), the lower end of the third pushing inclined plane (511) is connected with the inner circumferential surface of the pushing ring (5), when the outer end of the pushing block (4) abuts against the inner circumferential surface of the pushing ring (5), the supporting block (3) descends, the balls (8) are separated from the limiting groove (11) of the upper disc body (1), when the outer end of the pushing block (4) abuts against the inner side surface of the pushing convex part (51), the supporting block (3) ascends, the upper side surface of the supporting block (3) is flush with the bottom surface of the guide groove (21), and the control mechanism further comprises a control shaft (61) capable of driving the pushing ring (5) to rotate so that the third pushing inclined plane (511) pushes the pushing block (4) inwards.

6. The logistics tray of claim 5, wherein the second pushing inclined plane (41) is rotatably connected with a plurality of pushing rollers (43), the bottom surface of the push block (4) is rotationally connected with a plurality of supporting rollers (44), the length directions of the plurality of pushing rollers (43) and the plurality of supporting rollers (44) are all arranged along the width direction of the push block (4), the supporting rollers (44) are all propped against the bottom surface of the sliding groove (23), when the push block (4) slides inwards, the pushing roller (43) can push the first pushing inclined plane (32), the outer end of the push block (4) is provided with a pushing inclined plane four (45) which is matched with the pushing inclined plane three (511), the fourth pushing inclined plane (45) is rotationally connected with a plurality of vertical rollers (46) which are vertically arranged, when the pushing ring (5) rotates, the third pushing inclined plane (511) can push the vertical roller (46).

7. The logistics tray of claim 5 or 6, wherein the control mechanism further comprises a worm wheel (52) and a worm (6), the upper side surface of the lower tray body (2) is further provided with a rectangular groove (25), one side of the rectangular groove (25) is communicated with the annular groove (24), the worm (6) is rotatably connected in the rectangular groove (25), the worm wheel (52) is provided with a central hole, the pushing ring (5) is fixed on the inner peripheral wall of the worm wheel (52), the worm wheel (52) is meshed with the worm (6), the lower tray body (2) is further provided with two through holes, the inner ends of the two through holes are respectively communicated with two ends of the rectangular groove (25), the outer ends of the two through holes respectively penetrate through the two opposite side surfaces of the lower tray body (2), the two control shafts (61) are provided, and the two control shafts (61) are respectively rotatably inserted in the two through holes, the inner ends of the two control shafts (61) are fixedly connected with the two ends of the worm (6) respectively, and the outer ends of the two control shafts (61) are provided with inner hexagonal holes.

8. The logistics tray as claimed in claim 5 or 6, wherein the lower side surfaces of the positioning protrusions (12) are respectively provided with an avoiding concave cavity (121), the inner wall of the port of the avoiding concave cavity (121) is circumferentially provided with a first abutting flange (122), the avoiding concave cavity (121) is internally provided with a strip-shaped elastic sheet (124) and a limiting block (125), the bottom surface of the avoiding concave cavity (121) is provided with a strip-shaped groove (123), two ends of the elastic sheet (124) are respectively connected in the strip-shaped groove (123) in a sliding manner, the middle part of the elastic sheet (124) is arched downwards in an arc manner and abuts against the upper side surface of the limiting block (125), the outer edge of the upper part of the limiting block (125) is circumferentially provided with a second abutting flange (126), the second abutting flange (126) is located between the bottom surface of the avoiding concave cavity (121) and the first abutting flange (122), and the corner of the lower part of the limiting block (125) is provided, under the elastic action of flexure strip (124), when going up disk body (1) and rising and stopper (125) can support by leaning on disk body (2) lower side when rotating, when location lug (12) support by protruding edge two (126) when inserting constant head tank (26) and support by leaning on protruding edge one (122), disk body (2) all is equipped with the locking piece that can lock location lug (12) when location lug (12) inserts constant head tank (26) in constant head tank (26) department down.

9. The logistics tray of claim 8, wherein the locking member comprises a locking plate (7), one side of the positioning groove (26) is communicated with the annular groove (24), a clamping groove (127) is formed on one side of the positioning lug (12) facing the annular groove (24), two edges of the locking plate (7) are provided with hinge columns, the hinge columns are hinged on the groove wall of the positioning groove (26), a clamping block (71) is arranged at the upper end of the side of the locking plate (7) facing the positioning groove (26), a locking torsion spring (72) is sleeved on the hinge columns, the clamping block (71) can be clamped in the clamping groove (127) under the action of the locking torsion spring (72), a strip-shaped convex part (73) is arranged at the lower end of the side of the locking plate (7) facing the annular groove (24), and a plurality of unlocking convex parts (53) are circumferentially arranged on the outer circumferential surface of the pushing ring (, the unlocking convex part (53) is in a long strip shape, one end of the unlocking convex part (53) is provided with a pushing inclined plane five (531), the higher end of the pushing inclined plane five (531) is connected with the outer side surface of the unlocking convex part (53), the lower end of the pushing inclined plane five (531) is connected with the outer peripheral surface of the pushing ring (5), when the strip-shaped convex part (73) abuts against the outer peripheral surface of the pushing ring (5), the outer end of the pushing block (4) abuts against the inner peripheral surface of the pushing ring (5), when the strip-shaped convex part (73) abuts against the pushing inclined plane five (531), the outer end of the pushing block (4) also abuts against the inner peripheral surface of the pushing ring (5), when the outer end of the pushing block (4) abuts against the pushing inclined plane three (511), the strip-shaped convex part (73) abuts against the outer side surface of the unlocking convex part (53), and when the outer end of the pushing block (4) abuts against the inner peripheral surface of the pushing convex part (51), the strip-shaped convex, and the clamping block (71) is separated from the clamping groove (127).

10. The logistics tray of any one of claims 1 to 6, wherein the lower side of the upper tray body (1) is provided with a disc-shaped connecting seat (13), the outer edge of the lower end of the connecting seat (13) is circumferentially provided with a limiting convex edge (131), the lower tray body (2) is provided with a connecting hole (27), the lower end opening of the connecting hole (27) is circumferentially provided with a concave shoulder (271), the connecting seat (13) is inserted into the connecting hole (27), the limiting convex edge (131) is positioned in the concave shoulder (271), when the lower side of the upper tray body (1) abuts against the upper side of the lower tray body (2), a gap is formed between the upper side of the limiting convex edge (131) and the bottom surface of the concave shoulder (271), and the bottom cover (9) is further fixedly connected into the concave shoulder (271).