CN116674820A

CN116674820A - Three-dimensional cylinder type multi-stage parcel sorting system and sorting method

Info

Publication number: CN116674820A
Application number: CN202310564104.4A
Authority: CN
Inventors: 胡良斌; 叶佳伟; 秦丽华; 郭梓廷; 李胜; 邓健
Original assignee: University of South China
Current assignee: University of South China
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-09-01

Abstract

A three-dimensional cylinder type multi-stage parcel sorting system and a sorting method relate to the technical field of express sorting. The three-dimensional cylinder type multi-stage parcel sorting system comprises a sorting unit and a guiding-out device; the sorting unit comprises a frame, a tower-type sorter and a bagging and sealing assembly; the tower sorter is provided with a plurality of circles of annular areas A with gradually decreasing sizes from bottom to top; each bagging sealing assembly occupies a parcel collecting area at the lower end of the frame, a parcel transfer area is further arranged at the lower end of the frame, the parcel transfer area and all parcel collecting areas are surrounded to form an annular area B, and the annular area B is located under all annular areas A. The express sorting method is applied to a three-dimensional cylinder type multi-stage parcel sorting system and comprises the following steps of: pre-setting and path planning; the package enters a corresponding package bag according to the sorting path; and (5) sealing and cutting the wrapping bag. The invention has the advantages that: the parcel bag can receive a plurality of parcels of sweeping the dish exhaust simultaneously when strutting, has realized that many parcels simultaneously sort at the same moment, and sorting efficiency promotes to some extent.

Description

Three-dimensional cylinder type multi-stage parcel sorting system and sorting method

Technical Field

The invention relates to the technical field of express sorting, in particular to a three-dimensional cylinder type multi-stage parcel sorting system and a sorting method.

Background

In the current internet + economy mode, logistics is a very important link. Today's consumers, especially the young generation, are more inclined to shop on the internet, so daily traffic for domestic and foreign express delivery is very huge. In the process of express delivery transportation, it is indispensable to sort the express delivery, and this process determines whether the express delivery can be transported to the correct direction. At present, the express sorting equipment is widely applied to express companies, and the workload of express sorting personnel is reduced to a certain extent.

The invention patent with the publication number of CN109926332 discloses an express sorting system capable of synchronously sorting in multiple ways, which consists of a main frame and a plurality of sorting towers, wherein the main frame comprises a spiral slide which is vertically arranged and a plurality of bearing plates which are horizontally arranged outside the spiral slide and are arranged at intervals from top to bottom, the sorting towers are uniformly distributed on each bearing plate in a ring shape around the spiral slide, and parcel bags discharged by each sorting tower are summarized into the spiral slide. Compared with the existing express sorting system, the automatic sorting system can realize multipath synchronous sorting and automatic bagging output, and sorting efficiency is greatly improved.

However, the express sorting system described above has the following disadvantages:

1. Each sorting tower needs to be provided with a conveyor belt for inputting packages, the number of the conveyor belts to be configured is very large, and the height distribution is inconsistent (for example, the number of the bearing plates is 3, and 3 sorting towers are arranged on each bearing plate, then 9 conveyor belts are required to be configured), so that high peripheral equipment construction cost is generated, and a large amount of construction space is occupied (all the sorting towers on each bearing plate are annularly and uniformly distributed around a spiral slide, so that the conveying directions of the conveyor belts communicated to each sorting tower are inconsistent, all the conveyor belts on the same height are radially distributed, and the occupied area is large).

2. Although a plurality of bagging output devices are arranged in each sorting tower, the sorting speed of the single sorting tower is still limited, and only one package can fall into one bagging output device at the same time.

3. The bagging output device arranged in the sorting tower can realize the actions of opening the bag and closing the bag, but the bag closing operation is realized by tightening the tether which is wound around the bag opening, tight sealing cannot be realized, and the possibility that the bag opening is loosened (the package falls out) exists in the subsequent bag transferring process.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a three-dimensional cylinder type multistage parcel sorting system and a sorting method, which solve the problems that the number of external conveying belts required to be matched in a multi-path synchronous sorting express sorting system is large and the occupied area is large, the simultaneous sorting of a plurality of parcels at the same time cannot be realized, and the problem that the closing-in of parcel bags is not tight and is easy to loose.

The technical scheme of the invention is as follows: the three-dimensional cylinder type multi-stage parcel sorting system comprises a sorting unit and a guiding-out device;

the plurality of sorting units are stacked and installed from the ground from bottom to top; the sorting unit comprises a frame, a tower-type sorter and a bagging and sealing assembly; the frame is directly or indirectly fixedly arranged on the ground, the tower sorter is rotatably arranged at the upper end of the frame, a plurality of circles of annular areas A with gradually decreasing sizes from bottom to top are arranged on the tower sorter, and the annular areas A are formed by encircling a plurality of sector-shaped wrapping temporary storage areas; the bagging and sealing assemblies are distributed annularly and are arranged at the lower end of the frame, each bagging and sealing assembly occupies a sector-shaped package collecting area at the lower end of the frame, a sector-shaped package transfer area which is not occupied by the bagging and sealing assembly is also arranged at the lower end of the frame, the package transfer area and all the package collecting areas are surrounded to form an annular area B, and the annular area B is positioned right below all the annular areas A; the center of each sorting unit is provided with a blanking sub-channel, the blanking sub-channels are formed by sequentially communicating the center holes of all annular areas A of the tower type sorter, the center holes of the frame and the center holes of the annular areas B of the bagging and sealing assembly, and the blanking sub-channels of all sorting units are mutually communicated to form a blanking total channel;

The guiding device comprises a spiral slideway and a guide cone disc; the spiral slideway is arranged in the blanking main channel and is directly or indirectly fixedly arranged on the ground, a plurality of annular column-shaped inlets are arranged at intervals from top to bottom, the inlets are distributed between every two adjacent sorting units, and the lowest end of the spiral slideway is provided with a lower outlet for discharging the wrapping bags; the upper end of the guide cone disc is provided with a conical surface with gradually reduced height from the radial outer side to the radial inner side, and the center of the guide cone disc is provided with a center hole for passing through the wrapping bag; the number of the guide cone discs is consistent with that of the inlets of the spiral slide ways, the guide cone discs are directly or indirectly fixedly arranged on the spiral slide ways and positioned between every two adjacent sorting units, and the guide cone discs contain the inlets of the spiral slide ways through the center holes so as to realize that the wrapping bags slide into the spiral slide ways from the guide cone discs.

The invention further adopts the technical scheme that: it also includes a conveyor belt and a transfer channel; the conveyor belt comprises a conveyor belt A and a conveyor belt B; the number of the conveyor belts A is consistent with that of the annular areas A contained in the uppermost sorting unit, each conveyor belt A corresponds to one annular area A in the uppermost sorting unit, and the conveyor belts A are used for conveying packages into one package temporary storage area in the annular areas A; the conveyor belt B is arranged at the lower end of the outlet of the spiral slideway and the lower end of the parcel transit area of the lowest layer sorting unit and is used for outputting parcel bags filled with parcels; the transfer channel is a pipe fitting with upper and lower ends being open, is fixedly arranged between two adjacent sorting units and is positioned in a parcel transfer area, and is used for conveying the parcels discharged by one or more adjacent parcel temporary storage areas in the upper sorting unit to one or more adjacent parcel temporary storage areas in the lower sorting unit.

The invention further adopts the technical scheme that: the tower sorter comprises a plurality of scanning discs which are fixedly connected and overlapped in sequence from bottom to top and gradually decrease in size; the sweeping disc comprises a center ring and a plurality of sweeping arms which are annularly and uniformly distributed outside the center ring, a parcel temporary storage area for accommodating parcels is formed between two adjacent sweeping arms, a movable bottom plate is arranged at the lower end of each parcel temporary storage area, when the movable bottom plate rotates to be in a horizontal state, the parcels are temporarily stored in the parcel temporary storage area, and when the movable bottom plate is opened downwards, the parcels in the parcel temporary storage area are discharged downwards;

the tower sorter is driven to rotate by the first rotation driving mechanism, and the movable bottom plate is driven to rotate by the second rotation driving mechanism.

The invention further adopts the technical scheme that: the bagging and sealing assembly comprises a wrapping bag, an empty bag storage device, a wrapping bag opening and closing device and a wrapping bag hot melting and cutting device;

the wrapping bag consists of a front wall, a rear wall, a bottom wall surface connected between the front wall and the rear wall and two side walls; when the wrapping bag is not unfolded, the front wall is attached to the rear wall, the bottom wall and the two side walls are folded and compacted, when the wrapping bag is unfolded, the bottom wall and the two side walls are stretched and unfolded, the front wall is separated from the rear wall, a U-shaped notch is formed in the center of the edge of the upper end of the front wall of the wrapping bag, magnetic adsorption points A are respectively formed on two sides of the U-shaped notch on the outer surface of the front wall of the wrapping bag, two magnetic adsorption points B are formed in the lower end of the U-shaped notch on the outer surface of the front wall of the wrapping bag, and two magnetic adsorption points C are formed in the area, right against the U-shaped notch on the front wall, of the upper end of the inner surface of the rear wall of the wrapping bag; when the wrapping bag is not spread, the two magnetic adsorption points A, the two magnetic adsorption points B and the two magnetic adsorption points C are staggered; when any one of the parcel bags is opened, the upper end opening of the parcel bag is positioned right below all the annular areas A, so that the parcels in the specific parcel temporary storage area row in each annular area A are received;

The empty bag storage device is arranged on the radial outer side of the package collecting area; the empty bag storage device comprises a bag storage frame, a top plate and a spring; the upper end of the bag storage frame is fixedly connected with the frame; the bag storage frame comprises a groove-shaped side plate and a rectangular back plate; the groove-shaped side plates are fixedly connected to two sides of the rectangular backboard and are oppositely arranged, the rectangular backboard and the two groove-shaped side plates are surrounded to form an inner cavity of the bag storage frame, and an opening for tearing out the wrapping bag is arranged between the two groove-shaped side plates; the top plate is placed in the inner cavity of the bag storage frame, two sides of the top plate are respectively arranged opposite to the inner surfaces of the two groove-shaped side plates, a bag storage interval is formed between the top plate and the two groove-shaped side plates, and a spring interval is formed between the top plate and the rectangular back plate; the plurality of wrapping bags are stacked to form a stack and placed in a bag storage interval, the front wall of each wrapping bag is attached to the rear wall of the adjacent wrapping bag, and the rear wall of each wrapping bag is attached to the front wall of the adjacent wrapping bag; the spring is compressed in the spring interval, two ends of the spring are respectively propped against the rectangular back plate and the top plate, the top plate is pressed on the wad of wrapping bags through elasticity, and the wad of wrapping bags are pressed on the inner surfaces of the two groove-shaped side plates;

the opening and closing device of the bag opening comprises two groups of bag front wall pulling assemblies and two groups of bag rear wall positioning assemblies; the two groups of bag front wall traction components are distributed at the edges of two sides of the package collecting area; the front wall traction assembly comprises a screw rod A, a nut A, an electromagnet A and a motor A; the screw rod A is horizontally arranged and rotatably arranged at the lower end of the frame, and the extending direction of the screw rod A is the radial direction of the wrapping collecting area; the nut A is connected to the screw rod A in a threaded manner; the electromagnet A is fixedly connected to the nut A; the motor A is fixedly arranged at the lower end of the frame, and a shaft of the motor A is connected with the screw rod A through a coupler to drive the screw rod A to rotate, so that the electromagnet A is driven to move along the screw rod A; when the electromagnets A of the two groups of front wall traction assemblies move to one end relatively far away from the blanking sub-channel along the screw rod A, the two electromagnets A are respectively attached to two magnetic adsorption points A of the outermost wrap-bag in the bag storage frame; the two groups of back wall positioning assemblies are all arranged on the radial outer side of the parcel collecting area, the back wall positioning assemblies comprise electromagnets C, the electromagnets C are fixedly arranged at the lower end of the frame, and the electromagnets C in the two groups of back wall positioning assemblies penetrate through U-shaped gaps of the outermost parcel bags in the parcel bag frame so as to be respectively attached to two magnetic adsorption points C of the outermost parcel bags in the parcel bag frame;

The hot melting cutting device of the wrapping bag is arranged on the radial inner side of the wrapping collecting area; the hot melting cutting device of the wrapping bag comprises a substrate, an electromagnet B, a screw rod B, a nut B, a cutter, an electric heating block, a motor B and a motor C; the substrate is hinged at the lower end of the frame through a horizontally arranged hinge shaft at the upper end, one side of the substrate faces the blanking sub-channel, and the other side of the substrate faces away from the blanking sub-channel; the two electromagnets B are fixedly arranged on one side of the substrate, which is opposite to the blanking sub-channel, and when the two groups of front wall traction components adsorb two magnetic adsorption points A of the outermost wrapping bag in the bag storage frame through the electromagnets A and move to one end close to the blanking sub-channel, and the substrate is in a vertical neutral position, the two electromagnets B are respectively contacted with the two magnetic adsorption points B on the outermost wrapping bag in the bag storage frame; the screw rod B is horizontally arranged and rotatably arranged on the substrate, and the nut B is in threaded connection with the screw rod B; the cutter and the electric heating block are fixedly connected to the nut B, are arranged at intervals along the axial direction of the screw rod B, and are positioned on one side of the substrate, which is opposite to the blanking sub-channel; the motor B is fixedly arranged on the base plate, and a shaft of the motor B is connected with the screw rod B through a coupler to drive the screw rod B to rotate, so that the cutter and the electric heating block are driven to synchronously move along the axial direction of the screw rod B; the motor C is fixedly arranged on the frame, and the shaft of the motor C is connected with the hinge shaft of the base plate through a coupler so as to drive the base plate to rotate around the hinge shaft.

The invention further adopts the technical scheme that: the hot melting cutting device of the wrapping bag further comprises an infrared ranging module; the plurality of infrared ranging modules are arranged in a horizontal row and fixedly mounted on the surface of one side of the substrate, which faces away from the blanking sub-channel, and the arrangement height of the infrared ranging modules corresponds to the 60% horizontal height of the wrapping bags.

The technical scheme of the invention is as follows: the express sorting method is applied to the three-dimensional cylinder type multi-stage parcel sorting system, and before express sorting is executed, the three-dimensional cylinder type multi-stage parcel sorting system is in an initial state, and in the initial state:

the two electromagnets A adsorb two magnetic adsorption points A of the No. 1 wrapping bag by magnetic force c1, and the two electromagnets A move to one end close to the blanking sub-channel along the screw rod A so as to open the upper bag opening of the No. 1 wrapping bag;

all the movable bottom plates rotate to a horizontal state so that the packages put into the package temporary storage area can be temporarily stored in the package temporary storage area;

the method comprises the following steps:

s01, pre-setting and path planning:

the method comprises the steps that multi-gear magnetic force with gradient increase is preset for an electromagnet A, the magnetic force is C1, C2 and c3., cx is respectively from small to large, the maximum magnetic force of the electromagnet A is cmax-a, cmax is more than 1.3cx, and the maximum magnetic force of the electromagnet C is cmax-b; the number of the wad of wrap-bags in the storage bag frame from the outermost wrap-bag to the innermost wrap-bag is defined as 1, 2 and 3. When the magnetic force is c1, the magnetic force of the electromagnet A is enough to adsorb the front wall of the No. 1 wrapping bag and separate the front wall from the rear wall of the No. 1 wrapping bag, and the magnetic force of the electromagnet A is insufficient to adsorb the front wall of the No. 2 wrapping bag; when the magnetic force is c2, the magnetic force of the electromagnet A is enough to adsorb the front wall of the No. 1 wrapping bag and the front wall of the No. 2 wrapping bag at the same time, and separate the front wall from the rear wall of the No. 2 wrapping bag, and the magnetic force of the electromagnet A is insufficient to adsorb the front wall of the No. 3 wrapping bag; when the magnetic force is c3, the magnetic force of the electromagnet A is enough to adsorb the front wall of the No. 1 wrapping bag, the front wall of the No. 2 wrapping bag and the front wall of the No. 3 wrapping bag, and separate the front wall of the No. 3 wrapping bag from the rear wall, and the magnetic force of the electromagnet A is insufficient to adsorb the front wall of the No. 4 wrapping bag; similarly, when the magnetic force is cx, the magnetic force of the electromagnet A is enough to absorb the front wall of the No. 1-x wrapping bag and separate the front wall and the rear wall of the No. x wrapping bag;

B. Measuring the limit bearing of the No. 1 wrapping bag under two conditions in advance, taking the weight with relatively smaller measuring result, and marking the weight as m1, wherein the bearing capacity of the No. 1 wrapping bag for triggering the sealing operation is gamma m1; case I: the two electromagnets A adsorb the front wall of the No. 1 wrapping bag by magnetic force C1 respectively, and the two electromagnets C adsorb the rear wall of the No. 1 wrapping bag by maximum magnetic force cmax-b respectively; case II: the two electromagnets A adsorb the front wall of the No. 1 wrapping bag, the rear wall of the No. 1 wrapping bag and the front wall of the No. 2 wrapping bag at the same time by magnetic force c2 respectively; measuring the limit bearing of the No. 2 wrapping bag under two conditions in advance, taking the weight with relatively smaller measuring result, and marking the weight as m2, wherein the bearing capacity of the No. 2 wrapping bag for triggering the sealing operation is gamma m2; case I: the two electromagnets A adsorb the front wall of the No. 2 wrapping bag by magnetic force C2 respectively, and the two electromagnets C adsorb the rear wall of the No. 2 wrapping bag by maximum magnetic force cmax-b respectively; case II: the two electromagnets A adsorb the front wall of the No. 1 wrapping bag, the rear wall of the No. 1 wrapping bag, the front wall of the No. 2 wrapping bag, the rear wall of the No. 2 wrapping bag and the front wall of the No. 3 wrapping bag by magnetic force c3 respectively; by analogy, the bearing capacity of the triggering sealing operation of the x-number wrapping bag is gamma mx;

C. firstly, according to different terminal destinations to be sorted, associating each bagging sealing assembly with a specific terminal destination; the packages to be sorted are pre-weighed and placed on any conveyor belt A, and address information of the packages is scanned on the conveyor belt A; finally, the weight data of the package is associated with the address information thereof, so that a sorting path of the package is automatically planned;

In the step, gamma is a safety coefficient, and the value is 0.5-0.7;

s02, the package enters a corresponding package bag according to a sorting path:

after being discharged from the conveyor belt A, the target packages enter a package temporary storage area in the uppermost sorting unit, and then are divided into the following two cases:

if the bagging and sealing assembly corresponding to the target package is positioned in the uppermost sorting unit, the tower type sorter rotates for a certain angle to enable the target package to move to be right above the corresponding bagging and sealing assembly, and then the movable bottom plate is opened downwards to enable the target package to fall into the corresponding bagging and sealing assembly;

II, if the bagging and sealing assembly corresponding to the target package is positioned in a layer of sorting unit below, the tower type sorter rotates by a certain angle to enable the target package to move to the position right above the transfer channel, and then the movable bottom plate is opened downwards to enable the target package to fall into the transfer channel; the package enters a package temporary storage area of a next layer of sorting unit through a transfer channel; then, judging whether the bagging and sealing assembly corresponding to the target package is in the current layer of sorting unit or in a layer of sorting unit below, and then selecting and repeating the operation of the step I or the step II according to the judging result; reciprocating in this way until the target package falls into the corresponding bagging and sealing assembly;

S03, sealing and cutting the wrapping bag:

A. when the No. 1 wrapping bag in any bagging and sealing assembly meets the sealing condition, the two electromagnets A move to one end far away from the blanking sub-channel along the screw rod A on the premise of keeping the magnetic force c1, so that the upper end bag opening of the No. 1 wrapping bag is closed;

B. the magnetic force of the two electromagnets A is increased to c2, so that two magnetic force adsorption points A on the front wall of the No. 2 wrapping bag are adsorbed; then the two electromagnets C are temporarily powered off to loosen the back wall of the wrapping bag No. 1; then the electromagnet A keeps the magnetic force C2 to move towards one end close to the blanking sub-channel, and the rear wall of the wrapping bag No. 1 and the front wall of the wrapping bag No. 2 are pulled out from the lower ends of the two electromagnets C; then the two electromagnets C are electrified again so as to adsorb the back wall of the No. 2 wrapping bag; then two electromagnets A absorb the front wall of the No. 1 wrapping bag, the rear wall of the No. 1 wrapping bag and the front wall of the No. 2 wrapping bag and move along the screw rod A to one end close to the blanking sub-channel, so that the upper bag mouth of the No. 2 wrapping bag is opened; at this time, two magnetic adsorption points B on the front wall of the No. 1 wrapping bag are respectively contacted with two electromagnets B on the hot melting cutting device of the wrapping bag;

C. the two electromagnets B are electrified to adsorb the front wall of the No. 1 wrapping bag, then a motor C on the wrapping bag hot melting cutting device is started to drive the substrate to rotate towards the radial outer side of the wrapping collecting area, so that the No. 1 wrapping bag leans against the substrate, and as a plurality of wraps are contained in the No. 1 wrapping bag, the upper end of the front wall and the upper end of the rear wall of the No. 1 wrapping bag are stretched, leveled and attached under the pulling of the weight of the wraps, so that the subsequent hot melting and cutting are facilitated; at the moment, the cutter and the electric heating block are contacted with one side of the upper end of the front wall of the No. 1 wrapping bag;

D. The electric heating block is electrified and heated firstly, then the motor B is started, and the cutter and the electric heating block move towards the other side of the upper end of the front wall of the No. 1 wrapping bag together under the drive of the motor B; thus, the front wall and the rear wall of the hot-melt area of the No. 1 wrapping bag are cut together while the front wall and the rear wall of the No. 1 wrapping bag are fixed into a whole through hot-melt;

E. after cutting, the wrapping bag No. 1 is sealed and separated, then the two electromagnets B are powered off, the wrapping bag No. 1 falls on the guide cone disc immediately, then enters the inside of the spiral slide through the central hole of the guide cone disc and the inlet of the spiral slide, is discharged from the lower outlet of the spiral slide and falls on the conveying belt B, and finally is output to the outside through the conveying belt B.

The invention further adopts the technical scheme that: in step S03, one of the following two conditions is satisfied:

i, the wrapping bag is about to reach the bearing capacity for triggering the sealing operation; because each package is weighed before entering the sorting unit, each time before the package enters the package temporary storage area to be put into the package bag, the system calculates in advance whether the package bag reaches the bearing capacity for triggering the sealing operation after the package is put into the package bag; if the calculation result is reached, the package throwing is suspended and the sealing operation is immediately triggered; if the calculation result is not reached, normally putting the package into a package bag;

II, measuring the height of the package bag in real time by a distance measuring module, and when the height of the package bag in the package bag exceeds 60% of the height of the package bag, suspending the package throwing and immediately triggering the sealing operation.

The technical scheme of the invention is as follows: in step S02, the fan angle occupied by each of the expanded wrap-bag and transfer channel in annular region B is the same; correspondingly, in all annular areas A, the sector angle occupied by each wrapping temporary storage area is the same, and the angle occupied by the wrapping temporary storage area and the angle occupied by the opened wrapping bag are in an integer multiple matching relationship, so that the tower sorter can realize wrapping throwing by rotating a fixed angle each time.

Compared with the prior art, the invention has the following advantages:

the conveyor belt for inputting packages is only required to be configured at the outer side of the uppermost sorting unit, so that the quantity of the outer conveyor belt matched with the existing express sorting system is reduced, the occupied area is reduced, and the construction cost is reduced.

The parcel bags can simultaneously receive a plurality of parcels discharged by the sweeping disc when being opened, so that the simultaneous sorting of a plurality of parcels at the same time is realized, and the sorting efficiency is improved compared with the existing express sorting system.

The sealing mode of parcel bag is the hot melt, is as an organic whole with the back wall hot melt to the front wall of parcel bag, compares among the current express delivery letter sorting system and realizes parcel bag sealing's scheme more firm reliable through taut tether, and the parcel can not fall out.

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

Drawings

FIG. 1 is a schematic view of the appearance structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

fig. 3 is a schematic view of the sorting unit in a view angle;

fig. 4 is a schematic view of the sorting unit in another view;

FIG. 5 is a schematic view of the thermal fuse cut device of the wrap-bag in a first view;

FIG. 6 is a schematic view of the thermal fuse cut device of the wrap-bag in a second view;

FIG. 7 is a schematic diagram of the structure of the deriving device;

FIG. 8 is a block diagram of an empty bag storage device with a wrap-bag mounted thereto in one view;

FIG. 9 is a block diagram of the empty bag storage device with the wrap-bag mounted in another view;

FIG. 10 is a schematic view of two adjacent wrap-bags in an open and closed position, respectively;

FIG. 11 is a schematic illustration of a single wrap-bag in an open position;

fig. 12 is a schematic view of a single wrap-bag in a closed condition.

Legend description: a housing 100; a frame 1; a tower sorter 2; a sweep 21; a parcel temporary storage area 22; a movable floor 23; a wrap-bag 3; a front wall 31; a rear wall 32; a U-shaped notch 33; magnetic adsorption point a34; a magnetic adsorption point B35; a magnetic adsorption point C36; a bag frame 41; a trough-shaped side plate 411; a rectangular back plate 412; a top plate 42; a spring 43; a screw a51; a nut a52; an electromagnet a53; motor a54; an electromagnet C55; a substrate 61; an electromagnet B62; a screw B63; a cutter 64; an electric heating block 65; a motor C66; a spiral slideway 71; an inlet 711; a diversion cone 72; an outlet 721; an avoidance port 722; a conveyor belt a81; and a transfer passage 9.

Description of the embodiments

Example 1

As shown in fig. 1-12, the stereo cylinder type multi-stage parcel sorting system comprises a sorting unit, a guiding-out device, a conveyor belt and a transfer passage 9.

The plurality of sorting units are stacked and installed from bottom to top from the ground, blanking sub-channels are arranged in the center of each sorting unit, and the blanking sub-channels of all the sorting units are mutually communicated to form a blanking total channel.

The sorting unit comprises a frame 1, a tower sorter 2 and a bagging and sealing assembly.

The frame 1 is fixedly mounted directly or indirectly on the ground.

The tower sorter 2 is rotatably mounted at the upper end of the frame 1 by a first rotary driving mechanism, and is provided with a plurality of annular areas A with gradually decreasing sizes from bottom to top, wherein the annular areas A are formed by encircling a plurality of wrapping temporary storage areas 22 in the shape of fan columns. The tower sorter 2 comprises a plurality of sweep plates 21 which are fixedly connected and overlapped in sequence from bottom to top and gradually decrease in size. The sweeping disc 21 comprises a center ring and a plurality of sweeping arms which are uniformly distributed outside the center ring, a parcel temporary storage area 22 for accommodating parcels is formed between every two adjacent sweeping arms, the lower end of each parcel temporary storage area 22 of the sweeping disc 21 is provided with a movable bottom plate 23, the movable bottom plate 23 is driven to rotate by a second rotation driving mechanism, when the movable bottom plate 23 rotates to a horizontal state, parcels are temporarily stored in the parcel temporary storage areas 22, and when the movable bottom plate 23 is opened downwards, the parcels in the parcel temporary storage areas 22 are discharged downwards.

The bagging and sealing assemblies are distributed annularly and are arranged at the lower end of the frame 1, each bagging and sealing assembly occupies a sector-shaped package collecting area at the lower end of the frame 1, a sector-shaped package transfer area which is not occupied by the bagging and sealing assembly is arranged at the lower end of the frame 1, the package transfer area and all the package collecting areas are surrounded to form an annular area B, and the annular area B is located under all the annular areas A, so that the packages discharged in the annular area A can vertically fall into the annular area B.

The bagging and sealing assembly comprises a wrapping bag 3, an empty bag storage device, a wrapping bag opening and closing device and a wrapping bag hot melting and cutting device.

The wrapping bag 3 is composed of a front wall 31, a rear wall 32, a bottom wall surface connected between the front wall 31 and the rear wall 32, and two side walls; when the wrap-bag 3 is not unfolded, the front wall 31 is attached to the rear wall 32, the bottom wall and the two side walls are folded and compacted, and when the wrap-bag 3 is unfolded, the bottom wall and the two side walls are stretched and unfolded, the front wall 31 is separated from the rear wall 32, and the wrap-bag 3 can receive all the wraps discharged from the annular area A at the same time. The wrapping bag 3 is provided with a U-shaped notch 33 at the center of the upper edge of the front wall 31, magnetic adsorption points A34 are respectively arranged on two sides of the U-shaped notch 33 on the outer surface of the front wall 31 of the wrapping bag 3, two magnetic adsorption points B35 are arranged at the lower end of the U-shaped notch 33 on the outer surface of the front wall 31 of the wrapping bag 3, and two magnetic adsorption points C36 are arranged in the area, facing the U-shaped notch 33 on the front wall 31, of the upper end of the inner surface of the rear wall 32 of the wrapping bag 3. When the wrapping bag 3 is not opened, the two magnetic force adsorption points a34, the two magnetic force adsorption points B35, and the two magnetic force adsorption points C36 are offset from each other. When any wrap-bag 3 is opened, the upper end opening of the wrap-bag 3 is positioned directly below all the annular areas a, thereby receiving the wrap in a particular wrap-holding area row in each annular area a.

The empty bag storage means is disposed radially outwardly of the parcel collection zone. The empty bag storage device includes a bag frame 41, a top plate 42, and a spring 43. The bag frame 41 is fixedly connected at an upper end to the frame 1. The bag storage frame 41 comprises a groove-shaped side plate 411 and a rectangular back plate 412, wherein the groove-shaped side plates 411 are fixedly connected to two sides of the rectangular back plate 412 and are oppositely arranged, the rectangular back plate 412 and the two groove-shaped side plates 411 are encircled to form an inner cavity of the bag storage frame 41, and an opening for pulling out the wrapping bag 3 is arranged between the two groove-shaped side plates 411. The top plate 42 is placed in the inner cavity of the pocket frame 41, and both sides thereof are respectively arranged opposite to the inner surfaces of the two groove-shaped side plates 411, a pocket section is formed between the top plate 42 and the two groove-shaped side plates 411, and a spring section is formed between the top plate and the rectangular back plate 412. The plurality of wrap-bags 3 are stacked in a stack and placed in a storage area, the front wall 31 of each wrap-bag 3 is attached to the rear wall 32 of an adjacent wrap-bag 3, and the rear wall 32 of each wrap-bag 3 is attached to the front wall 31 of an adjacent wrap-bag 3. The spring 43 is compressed in the spring section, two ends of the spring are respectively propped against the rectangular back plate 412 and the top plate 42, the top plate 42 is pressed on the wad of wrapping bags 3 by elasticity, and the wad of wrapping bags 3 are pressed on the inner surfaces of the two groove-shaped side plates 411.

The opening and closing device of the bag opening comprises two groups of bag front wall pulling assemblies and two groups of bag rear wall positioning assemblies. The two groups of bag front wall traction components are distributed at two side edges of the package collecting area. The front wall traction assembly comprises a screw rod A51, a nut A52, an electromagnet A53 and a motor A54. The screw rod A51 is horizontally arranged and rotatably installed at the lower end of the frame 1, and the extending direction of the screw rod A is the radial direction of the wrapping collecting area. The nut a52 is screwed on the screw a 51. The electromagnet A53 is fixedly connected to the nut A52. The motor A54 is fixedly arranged at the lower end of the frame 1, and a shaft of the motor A54 is connected with the screw rod A51 through a coupler to drive the screw rod A51 to rotate, so that the electromagnet A53 is driven to move along the screw rod A51. When the electromagnets a53 of the two sets of front wall pulling assemblies are moved along the screw a51 to one end relatively far away from the blanking sub-channel, the two electromagnets a53 are respectively attached to the two magnetic adsorption points a34 of the outermost wrapping bag 3 in the bag storage frame 41. Both sets of back wall locating assemblies are disposed radially outward of the parcel collection zone. The rear wall positioning components comprise electromagnets C55, the electromagnets C55 are fixedly arranged at the lower end of the frame 1, and the electromagnets C55 in the two groups of rear wall positioning components penetrate through the U-shaped notch 33 of the outermost wrapping bag 3 in the bag storage frame 41, so that the electromagnets C55 are respectively attached to the two magnetic adsorption points C36 of the outermost wrapping bag 3 in the bag storage frame 41.

The wrapping bag hot melt cutting device is arranged on the radial inner side of the wrapping collecting area. The wrapping bag hot melt cutting device comprises a base plate 61, an electromagnet B62, a screw rod B63, a nut B, a cutter 64, an electric heating block 65, a motor B and a motor C66. The base plate 61 is hinged at its upper end to the lower end of the frame 1 by means of a horizontally arranged hinge shaft, one side of which faces the blanking sub-channel and the other side of which faces away from the blanking sub-channel. Two electromagnets B62 are fixedly installed on the side of the base plate 61 facing away from the blanking sub-channel, and when the two groups of front wall pulling assemblies adsorb the two magnetic adsorption points a34 of the outermost wrapping bag 3 in the bag storage frame 41 through the electromagnets a53 and move to the end close to the blanking sub-channel, and when the base plate 61 is in the vertical neutral position, the two electromagnets B62 are respectively contacted with the two magnetic adsorption points B35 on the outermost wrapping bag 3 in the bag storage frame 41. The screw rod B63 is horizontally arranged and rotatably mounted on the base plate 61, and the nut B is screwed on the screw rod B63. The cutter 64 and the electric heating block 65 are fixedly connected to the nut B, are arranged at intervals along the axial direction of the screw rod B63, and are positioned on one side of the substrate 61, which is opposite to the blanking sub-channel. The motor B is fixedly arranged on the base plate 61, and the shaft of the motor B is connected with the screw rod B63 through a coupler to drive the screw rod B63 to rotate, so that the cutter 64 and the electric heating block 65 are driven to synchronously move along the axial direction of the screw rod B63. The motor C66 is fixedly installed on the frame 1, and its spindle is connected to the hinge shaft of the base plate 61 through a coupling to drive the base plate 61 to rotate about its hinge shaft.

The guiding means comprises a spiral slide 71 and a guiding cone 72. The spiral slideway 71 is arranged in the blanking main channel and is directly or indirectly fixedly arranged on the ground, a plurality of annular column-shaped inlets 711 are arranged at intervals from top to bottom, the inlets 73 are distributed between every two adjacent sorting units, and the lowest end of the spiral slideway is provided with a lower outlet for discharging the wrapping bags. The upper end of the cone 72 is provided with a cone surface with gradually decreasing height from the radial outer side to the radial inner side, and the center of the cone 72 is provided with a center hole 721 for passing the wrapping bag. The number of the guide cone plates 72 is consistent with that of the inlets of the spiral slide ways 71, the guide cone plates 72 are directly or indirectly fixedly arranged on the spiral slide ways 71 and are positioned between every two adjacent sorting units, and the guide cone plates 72 contain the inlets 711 of the spiral slide ways 71 in the guide cone plates 72 through the center holes 721 so as to realize that the wrapping bags slide into the spiral slide ways 71 from the guide cone plates 72. The diversion cone 72 is provided with a avoiding port 722 through which the transfer passage 9 passes.

The conveyor belts include a conveyor belt a81 and a conveyor belt B (not shown in the figure). The number of conveyor belts a81 corresponds to the number of annular areas a included in the uppermost sorting unit, each conveyor belt a81 corresponds to one of the annular areas a in the uppermost sorting unit, and the conveyor belt a81 is used for feeding packages into one of the annular areas a in the package holding area 22. The conveyor B is provided at the lower end of the outlet 721 of the spiral chute 71 and the lower end of the parcel transit area of the lowermost sorting unit, for outputting parcel bags filled with parcels.

The transfer channel 9 is a pipe with open upper and lower ends, is fixedly arranged between two adjacent sorting units and is positioned in a parcel transfer area, and is used for conveying the parcels discharged from one or more adjacent parcel temporary storage areas 22 in the upper sorting unit to one or more adjacent parcel temporary storage areas 22 in the lower sorting unit.

Preferably, the wrap-bag hot-melt cutting device further includes a ranging module 67. A plurality of distance measuring modules 67 are arranged in a horizontal row fixedly mounted on the side surface of the base plate 61 facing away from the blanking sub-channel, the arrangement height of which corresponds to the horizontal height of the wrap-bag 60%. The distance measuring module 67 is used for measuring whether the package contained in the package bag 3 exceeds a preset height (the preset height is 60% of the height of the package bag).

Preferably, it further comprises a housing 100, the housing 100 containing the sorting unit, the lead-out device and the transfer channel 9 in its inner space.

Preferably, each of the expanded wrap-bags 3 and transfer channels 9 occupy the same fan angle in the annular region B (e.g., 7 bagging closure assemblies in this embodiment, 7 for the expanded wrap-bags 3 and 1 for the transfer channels 9, then 45 ° for each of the expanded wrap-bags 3 and 45 ° for the transfer channels). Accordingly, in all annular areas a, the fan angle occupied by each wrapping register 22 is the same, and the angle occupied by the wrapping register 22 and the angle occupied by the opened wrap-bag 3 are in an integer multiple matching relationship (for example, the angle occupied by the opened wrap-bag 3 is 45, then in all annular areas a, an integer number (1-2) of the wrapping registers 22 can be accommodated in the 45 ° fan-shaped area). Based on this structure, the tower sorter rotates fixed angle at every turn and can throw in the parcel, easily operation and control.

In this embodiment, the blanking sub-channel is formed by sequentially communicating the central holes of all annular areas a of the tower sorter 2, the central holes of the frame 1, and the central holes of the annular areas B of the bagging and sealing assembly.

In this embodiment, the first rotation driving mechanism adopts a gear pair rotation structure to realize accurate transmission, and the structure is common in the prior art and will not be described again. The second rotation driving mechanism is an air cylinder or a hydraulic cylinder, and is used for realizing rotation control of the movable bottom plate 23, and the structure of the second rotation driving mechanism is common in the prior art and will not be described again.

Brief description of the working process of the invention:

the express sorting method is applied to a three-dimensional cylinder type multi-stage parcel sorting system, and before express sorting is executed, the three-dimensional cylinder type multi-stage parcel sorting system is in an initial state, and in the initial state:

the two electromagnets A53 adsorb two magnetic adsorption points A34 of the No. 1 wrapping bag by magnetic force c1, and the two electromagnets A53 move to one end close to the blanking sub-channel along the screw rod A51, so that the upper bag mouth of the No. 1 wrapping bag is opened;

II, all movable bottom plates 23 are rotated to a horizontal state, so that the package put into the package temporary storage area can be temporarily stored therein.

The method comprises the following steps:

s01, pre-setting and path planning:

A. the magnetic force of the electromagnet A53 is preset to be in gradient increasing multi-gear magnetic force, the magnetic force is respectively C1, C2 and c3., cx, the maximum magnetic force of the electromagnet A53 is cmax-a, cmax is more than 1.3cx, and the maximum magnetic force of the electromagnet C55 is cmax-b. The wad of wrap-bags in the pouch frame 41 are defined to be numbered 1, 2, 3..x, respectively, from the outermost wrap-bag to the innermost wrap-bag. When the magnetic force is c1, the magnetic force of the electromagnet a53 is sufficient to attract the front wall 31 of the No. 1 wrap-bag and separate the front wall 31 from the rear wall 32 of the No. 1 wrap-bag, and the magnetic force of the electromagnet a53 is insufficient to attract the front wall 31 of the No. 2 wrap-bag. When the magnetic force is c2, the magnetic force of the electromagnet a53 is sufficient to simultaneously adsorb the front wall 31 of the No. 1 wrap-bag and the front wall 31 of the No. 2 wrap-bag and separate the front wall from the rear wall of the No. 2 wrap-bag, and the magnetic force of the electromagnet a53 is insufficient to adsorb the front wall 31 of the No. 3 wrap-bag. When the magnetic force is c3, the magnetic force of the electromagnet a53 is sufficient to adsorb the front wall 31 of the No. 1 wrap-bag and the front wall 31 of the No. 2 wrap-bag and the front wall 31 of the No. 3 wrap-bag, and separate the front wall 31 of the No. 3 wrap-bag from the rear wall 32, and the magnetic force of the electromagnet a53 is insufficient to adsorb the front wall 31 of the No. 4 wrap-bag. Similarly, when the magnetic force is cx, the magnetic force of the electromagnet a53 is sufficient to attract the front wall of the No. 1 to x wrap-bag and separate the front wall 31 from the rear wall 32 of the No. x wrap-bag;

C. firstly, according to different terminal destinations to be sorted, associating each bagging sealing assembly with a specific terminal destination; the packages to be sorted are pre-weighed and placed on any conveyor belt A81, and address information of the packages is scanned on the conveyor belt A81. And finally, correlating the weight data of the package with the address information thereof, thereby automatically planning a sorting path of the package.

In the step, gamma is a safety coefficient and takes a value of 0.5-0.7.

after the target package is discharged from the conveyor belt A81, the target package enters a package temporary storage area in the uppermost sorting unit, and then the two cases are divided into the following two cases:

if the bagging and sealing assembly corresponding to the target package is positioned in the uppermost sorting unit, the tower sorter 2 rotates for a certain angle to enable the target package to move to be right above the corresponding bagging and sealing assembly, and then the movable bottom plate 23 is opened downwards to enable the target package to fall into the corresponding bagging and sealing assembly;

and II, if the bagging and sealing assembly corresponding to the target package is positioned in a layer of sorting unit below, the tower sorter 2 rotates by a certain angle to enable the target package to move to the position right above the transfer channel 9, and then the movable bottom plate 23 is opened downwards to enable the target package to fall into the transfer channel 9. The parcels pass through the transfer channel 9 into the parcel deposit area of the next layer of sorting units. Then, judging whether the bagging and sealing assembly corresponding to the target package is in the current layer of sorting unit or in a layer of sorting unit below, and then selecting and repeating the operation of the step I or the step II according to the judging result; and (3) reciprocating the packaging machine until the target package falls into the corresponding bagging sealing assembly.

S03, sealing and cutting the wrapping bag:

A. when the wrapping bag No. 1 in any bagging and sealing assembly meets the sealing condition, the two electromagnets A53 move to one end far away from the blanking sub-channel along the screw rod A51 on the premise of keeping the magnetic force c1, so that the upper end bag opening of the wrapping bag No. 1 is closed;

B. the magnetic force of the two electromagnets A53 is increased to c2, so that two magnetic force adsorption points A34 on the front wall 31 of the No. 2 wrapping bag are adsorbed; then the two electromagnets C55 are temporarily de-energized to loosen the back wall 32 of the No. 1 wrap-bag; then the electromagnet A53 keeps the magnetic force C2 to move towards one end close to the blanking sub-channel, and the rear wall 32 of the wrapping bag No. 1 and the front wall 31 of the wrapping bag No. 2 are pulled out from the lower ends of the two electromagnets C55; then the two electromagnets C55 are powered back to adsorb the back wall 32 of the No. 2 wrapping bag; then two electromagnets A53 adsorb the front wall 31 of the No. 1 wrapping bag, the rear wall 32 of the No. 1 wrapping bag and the front wall 31 of the No. 2 wrapping bag and move along the screw rod A51 to the end close to the blanking sub-channel, so that the upper end bag mouth of the No. 2 wrapping bag is opened; at this time, two magnetic adsorption points B35 on the front wall 31 of the wrapping bag No. 1 are respectively contacted with two electromagnets B62 on the hot-melt cutting device of the wrapping bag;

C. The two electromagnets B62 are electrified to adsorb the front wall 31 of the No. 1 wrapping bag, then a motor C66 on the wrapping bag hot melting cutting device is started to drive the substrate 61 to rotate towards the radial outer side of the wrapping collecting area, so that the No. 1 wrapping bag leans against the substrate 61, and as a plurality of wraps are contained in the No. 1 wrapping bag, the upper end of the front wall 31 and the upper end of the rear wall 32 of the No. 1 wrapping bag are stretched, leveled and attached under the pulling of the weight of the wraps, so that the subsequent hot melting and cutting are facilitated; at this time, the cutter 64 and the electric heating block 65 are both contacted with one side of the upper end of the front wall 31 of the No. 1 wrapping bag;

D. the electric heating block 65 is electrified and heated firstly, then the motor B is started, and the cutter 64 and the electric heating block 65 move towards the other side of the upper end of the front wall of the No. 1 wrapping bag together under the drive of the motor B; so that the front wall 31 and the rear wall 32 of the hot melt area of the No. 1 wrapping bag are cut together while the front wall 31 and the rear wall 32 of the No. 1 wrapping bag are fixed into a whole by hot melt;

E. after cutting, the wrapping bag No. 1 is sealed and separated, then the two electromagnets B62 are powered off, the wrapping bag No. 1 falls on the guide cone 72, then enters the spiral slide 71 through the central hole 721 of the guide cone 72 and the inlet 711 of the spiral slide 71, is discharged from the lower outlet of the spiral slide 71 and falls on the conveying belt B, and finally is output to the outside through the conveying belt B.

In this step, one of the following two conditions is satisfied:

Claims

1. Three-dimensional cylinder multistage parcel letter sorting system, characterized by: comprises a sorting unit and a deriving device;

2. The three-dimensional cylindrical multistage parcel sorting system of claim 1, wherein: it also includes a conveyor belt and a transfer channel; the conveyor belt comprises a conveyor belt A and a conveyor belt B; the number of the conveyor belts A is consistent with that of the annular areas A contained in the uppermost sorting unit, each conveyor belt A corresponds to one annular area A in the uppermost sorting unit, and the conveyor belts A are used for conveying packages into one package temporary storage area in the annular areas A; the conveyor belt B is arranged at the lower end of the outlet of the spiral slideway and the lower end of the parcel transit area of the lowest layer sorting unit and is used for outputting parcel bags filled with parcels; the transfer channel is a pipe fitting with upper and lower ends being open, is fixedly arranged between two adjacent sorting units and is positioned in a parcel transfer area, and is used for conveying the parcels discharged by one or more adjacent parcel temporary storage areas in the upper sorting unit to one or more adjacent parcel temporary storage areas in the lower sorting unit.

3. The three-dimensional cylindrical multistage parcel sorting system of claim 2, wherein: the tower sorter comprises a plurality of scanning discs which are fixedly connected and overlapped in sequence from bottom to top and gradually decrease in size; the sweeping disc comprises a center ring and a plurality of sweeping arms which are annularly and uniformly distributed outside the center ring, a parcel temporary storage area for accommodating parcels is formed between two adjacent sweeping arms, a movable bottom plate is arranged at the lower end of each parcel temporary storage area, when the movable bottom plate rotates to be in a horizontal state, the parcels are temporarily stored in the parcel temporary storage area, and when the movable bottom plate is opened downwards, the parcels in the parcel temporary storage area are discharged downwards;

4. A three-dimensional cylindrical multistage parcel sorting system according to claim 3, characterized in that: the bagging and sealing assembly comprises a wrapping bag, an empty bag storage device, a wrapping bag opening and closing device and a wrapping bag hot melting and cutting device;

the wrapping bag consists of a front wall, a rear wall, a bottom wall surface connected between the front wall and the rear wall and two side walls; when the wrapping bag is not unfolded, the front wall is attached to the rear wall, the bottom wall and the two side walls are folded and compacted, and when the wrapping bag is unfolded, the bottom wall and the two side walls are stretched and unfolded, and the front wall is separated from the rear wall; the wrapping bag is provided with a U-shaped notch at the center of the edge of the upper end of the front wall, magnetic adsorption points A are respectively arranged on two sides of the U-shaped notch on the outer surface of the front wall, two magnetic adsorption points B are arranged at the lower end of the U-shaped notch on the outer surface of the front wall, and two magnetic adsorption points C are arranged in the area, facing the U-shaped notch on the front wall, of the upper end of the inner surface of the rear wall of the wrapping bag; when the wrapping bag is not spread, the two magnetic adsorption points A, the two magnetic adsorption points B and the two magnetic adsorption points C are staggered; when any one of the parcel bags is opened, the upper end opening of the parcel bag is positioned right below all the annular areas A, so that the parcels in the specific parcel temporary storage area row in each annular area A are received;

5. The three-dimensional cylindrical multistage parcel sorting system of claim 4, wherein: the hot melting cutting device of the wrapping bag further comprises an infrared ranging module; the plurality of infrared ranging modules are arranged in a horizontal row and fixedly mounted on the surface of one side of the substrate, which faces away from the blanking sub-channel, and the arrangement height of the infrared ranging modules corresponds to the 60% horizontal height of the wrapping bags.

6. The express sorting method is applied to the three-dimensional cylinder type multi-stage parcel sorting system according to claim 5, and is characterized in that before the express sorting is performed, the three-dimensional cylinder type multi-stage parcel sorting system is in an initial state, and in the initial state:

the two electromagnets A are respectively adsorbed on two magnetic adsorption points A of the No. 1 wrapping bag by magnetic force c1, and the two electromagnets A are respectively moved to one end close to the blanking sub-channel along the screw rod A, so that the upper end bag mouth of the No. 1 wrapping bag is opened;

II, all the movable bottom plates rotate to be in a horizontal state, so that the packages put into the package temporary storage area can be temporarily stored in the package temporary storage area;

the method comprises the following steps:

s01, pre-setting and path planning:

A. the method comprises the steps that multi-gear magnetic force with gradient increase is preset for an electromagnet A, the magnetic force is C1, C2 and c3., cx is respectively from small to large, the maximum magnetic force of the electromagnet A is cmax-a, cmax is more than 1.3cx, and the maximum magnetic force of the electromagnet C is cmax-b; the number of the wad of wrap-bags in the storage bag frame from the outermost wrap-bag to the innermost wrap-bag is defined as 1, 2 and 3. When the magnetic force is c1, the magnetic force of the electromagnet A is enough to adsorb the front wall of the No. 1 wrapping bag and separate the front wall from the rear wall of the No. 1 wrapping bag, and the magnetic force of the electromagnet A is insufficient to adsorb the front wall of the No. 2 wrapping bag; when the magnetic force is c2, the magnetic force of the electromagnet A is enough to adsorb the front wall of the No. 1 wrapping bag and the front wall of the No. 2 wrapping bag at the same time, and separate the front wall from the rear wall of the No. 2 wrapping bag, and the magnetic force of the electromagnet A is insufficient to adsorb the front wall of the No. 3 wrapping bag; when the magnetic force is c3, the magnetic force of the electromagnet A is enough to adsorb the front wall of the No. 1 wrapping bag, the front wall of the No. 2 wrapping bag and the front wall of the No. 3 wrapping bag, and separate the front wall of the No. 3 wrapping bag from the rear wall, and the magnetic force of the electromagnet A is insufficient to adsorb the front wall of the No. 4 wrapping bag; similarly, when the magnetic force is cx, the magnetic force of the electromagnet A is enough to absorb the front wall of the No. 1-x wrapping bag and separate the front wall and the rear wall of the No. x wrapping bag;

In the step, gamma is a safety coefficient, and the value is 0.5-0.7;

S03, sealing and cutting the wrapping bag:

7. The express sorting method of claim 6, wherein: in step S03, one of the following two conditions is satisfied:

8. The express sorting method of claim 7, wherein: in step S02, the fan angle occupied by each of the expanded wrap-bag and transfer channel in annular region B is the same; correspondingly, in all annular areas A, the sector angle occupied by each wrapping temporary storage area is the same, and the angle occupied by the wrapping temporary storage area and the angle occupied by the opened wrapping bag are in an integer multiple matching relationship, so that the tower sorter can realize wrapping throwing by rotating a fixed angle each time.