CN115685945A - Material scheduling system and method based on RFID - Google Patents

Abstract

The invention discloses a material scheduling system and method based on RFID, and belongs to the technical field of material scheduling. Aiming at the problem of low material scheduling efficiency, the invention provides a material scheduling system based on RFID, which comprises a plurality of feeding stations, a plurality of processing stations and a conveying device; the conveying device comprises a plurality of conveying lines, the plurality of conveying lines comprise a conveying main line, a plurality of conveying branch lines connected to the side edge of the conveying main line and a plurality of cache conveying lines connected to the side edge of the conveying branch lines, a plurality of loading stations are arranged on the side edge of the conveying main line, and a plurality of processing stations are arranged on the side edge of the cache conveying lines; the conveying device is provided with a plurality of bearing devices for bearing materials, the bearing devices are driven by the conveying device to transfer the materials of the feeding stations to the corresponding processing stations, the bearing devices are provided with electronic tags, the conveying main line and the conveying branch lines are provided with a plurality of readers, and the readers are respectively arranged on the material inlet sides of the two intersections.

Description

Material scheduling system and method based on RFID

Technical Field

The invention relates to the technical field of material scheduling, in particular to a material scheduling system and method based on RFID.

Background

When materials of food processing enterprises are operated in a workshop, the materials are generally carried to a processing station by manpower, but in the process, on one hand, the materials are transported to have unsafe factors for people, and on the other hand, the materials also have unsanitary factors.

The prior art is also correspondingly improved, for example, a chinese patent application with publication number of 2019-9-24 and publication number of CN110271855a discloses a processing system based on sensing control of radio frequency identification technology and a control method thereof, the processing system based on sensing control of radio frequency identification technology comprises a conveyor belt and a plurality of machine tools, the plurality of machine tools are arranged on one side of the conveyor belt and are sequentially arranged along the direction of conveying workpieces by the conveyor belt, the conveyor belt position corresponding to each machine tool is provided with a radio frequency identification reader-writer and a stopper, the processing system further comprises a plurality of mobile robots for clamping workpieces, and the side surfaces of the workpieces are provided with electronic tags. According to the invention, all the operation machine tools are connected in series, the working efficiency is maximized, the radio frequency identification technology is adopted, the non-contact reading and writing of the processing data are realized, the mixed operation of the operation machine tools is realized through the information torsion of the electronic tags, the whole processing process is orderly carried out, the processing and manufacturing are controllable and manageable, the data of the whole processing process can be collected, stored, traceable and analyzable, and the operation machine tools are connected through a network, so that the information sharing of the whole processing process is realized. The disadvantages of the scheme are that: the plurality of machine tools are arranged in sequence along the direction of conveying the workpieces by the conveyor belt, namely, only a single feeding port is arranged, so that the material dispatching efficiency is low.

Therefore, in view of the above problems, it is necessary to propose a further solution to solve at least one of the problems.

Disclosure of Invention

In order to solve the problem of low efficiency of related material scheduling, the invention provides a material scheduling system and method based on RFID. The technical scheme is as follows:

a material scheduling system based on RFID comprises a plurality of feeding stations, a plurality of processing stations and a conveying device;

the conveying device comprises a plurality of conveying lines, the plurality of conveying lines comprise a conveying main line, a plurality of conveying branch lines connected to the side edge of the conveying main line and a plurality of cache conveying lines connected to the side edge of the conveying branch lines, a plurality of loading stations are arranged on the side edge of the conveying main line, and a plurality of processing stations are arranged on the side edge of the cache conveying lines;

the material loading device is characterized in that a plurality of loading devices used for loading materials are arranged on the conveying device, the loading devices are driven by the conveying device to transfer the materials of the loading stations to the corresponding processing stations, electronic tags are arranged on the loading devices, a plurality of readers are arranged on the conveying main line and the conveying branch line, and the readers are arranged on the material inlet sides of the intersections respectively.

In a preferred embodiment of the present invention, the plurality of conveying lines further include a feeding conveying line, two ends of the feeding conveying line are respectively connected to the feeding station and the main conveying line, and a reader is disposed at one end of the feeding conveying line close to the main conveying line.

In a preferred embodiment of the invention, a reader is arranged close to the feeding station.

In a preferred embodiment of the present invention, a steering device is disposed at the intersection, and the steering device is used for adjusting the running direction of the carrying device.

In a preferred embodiment of the present invention, each of the main conveying line and the branch conveying line includes a conveying unit, the conveying unit is disposed near a material inlet side of the intersection, the conveying unit is sequentially connected with a first conveying line, a second conveying line and a third conveying line in a direction away from the intersection, a length of the first conveying line is the same as a length of the carrying device, and the reader is disposed between the first conveying line and the second conveying line.

In a preferred embodiment of the present invention, the system further comprises a control device, wherein the control device comprises an upper computer and a lower computer which are in communication connection, and the lower computer is in communication connection with the reader and the conveying device.

In a preferred embodiment of the present invention, the lower computer is configured to suspend the transmission line in which the second half of the carrying device is located when the reader identifies the electronic tag on the carrying device, and send a command request message to the upper computer;

after receiving a command operation message sent by the upper computer, controlling the operation of the transmission line and the steering device which are correspondingly suspended;

and after the bearing device leaves the steering device, sending a state information message to the upper computer.

In a preferred embodiment of the present invention, the command request message includes a request command number, an electronic tag number, and an intersection position value, the command operation message includes an electronic tag number, an operation direction, a destination, and a next intersection position value, and the status information message includes a passing intersection flag and an electronic tag number.

In a preferred embodiment of the present invention, the lower computer is configured to calculate the number of the carrying devices on the transmission line between two intersections according to the intersection position value and the next intersection position value corresponding to the same electronic tag number.

The other technical scheme is as follows:

a material scheduling method based on RFID adopts any one of the material scheduling systems, and comprises the following steps:

responding to the reader to identify the electronic tag on the bearing device, controlling the suspension of the transmission line where the rear half section of the bearing device is located by the lower computer, and sending a command request message to the upper computer;

receiving a command operation message issued by the upper computer, and controlling the operation of the correspondingly suspended conveying line and the steering device according to the command operation message;

and responding to the situation that the bearing device leaves the intersection, and sending a state information message to the upper computer by the lower computer.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the conveying device is adopted to connect the feeding station and the processing station, the carrying device is provided with the electronic tag, and the conveying device is provided with the reader, so that the automatic transfer of materials is realized, the working strength of workers is reduced, the working safety of the workers is improved, and the sanitation condition of the materials is improved; in addition, the plurality of feeding stations are arranged on the side edge of the main conveying line, so that feeding of a plurality of feeding points is realized, and the material dispatching efficiency is improved; simultaneously, this application has realized in advance before transporting the material to the processing station through set up the buffer memory transfer chain between branch of delivery line and processing station, has improved the continuity of processing, and then has improved machining efficiency.

Drawings

FIG. 1 is a schematic layout of the present invention.

Wherein, the numerical labels 1-25 are the processing station numbers, and the numerical labels 101-524 are the conveying line numbers.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.

An RFID system (radio frequency identification system) is a non-contact automatic identification system, which automatically identifies a target object by radio frequency wireless signals and acquires related data, and is composed of an electronic tag, a reader (also called an interrogator, a communicator, a scanner, a reader-writer, a programmer, a reading device, a portable reader, an AEI device, and the like), and a computer network. The radio frequency identification system uses an electronic tag to identify an object, the electronic tag exchanges data with a reader through radio waves, the reader can transmit a read-write command of a host to the electronic tag and then transmits data returned by the electronic tag to the host, and the data exchange and management system of the host is responsible for completing storage, management and control of data information of the electronic tag.

Example 1:

as shown in fig. 1, an RFID-based material scheduling system includes a plurality of loading stations, a plurality of processing stations, and a conveyor. The conveying device is provided with a plurality of bearing devices for bearing materials, and the bearing devices are driven by the conveying device to transfer the materials of the feeding stations to the corresponding processing stations. The conveyor comprises several conveyor lines, generally speaking, the length of which is greater than the length of a single carrier. The plurality of conveying lines comprise a conveying main line, a plurality of conveying branch lines connected to the side edge of the conveying main line and a plurality of buffer conveying lines connected to the side edge of the conveying branch lines. The plurality of feeding stations are arranged on the side edge of the conveying main line, in the embodiment, the feeding stations are arranged at the two ends of the conveying main line, and the plurality of feeding stations are arranged on the other side of the middle section of the main line. A plurality of processing stations set up in the side of buffer memory transfer chain, and generally speaking, processing station sets up in buffer memory transfer chain end, and in this embodiment, the terminal both sides of buffer memory transfer chain all are provided with processing station, and the accessible sets up at buffer memory transfer chain end and turns to turning device in order to turn to the carrier device and empty the material to corresponding processing station. Preferably, the conveying branch line and the feeding station are distributed on different sides of the conveying main line along the length direction of the conveying main line so as to reduce the running conflict of the carrying device and conveniently isolate the processing station and the feeding station so as to improve the processing sanitary condition.

The conveying lines further comprise feeding conveying lines, and two ends of each feeding conveying line are respectively connected with a feeding station and a conveying main line so as to automatically transfer the materials to the conveying main line. And a reader is arranged at one end of the feeding conveying line close to the conveying main line. Preferably, a reader is arranged close to the loading station, so that the electronic tag on the bearing device is bound with the material in the bearing device before transferring. Preferably, the feeding conveyor line is arranged opposite to the branch conveyor line, i.e. the feeding conveyor line is connected to the intersection of the main conveyor line, so that the steering device (see below) can be shared.

In order to realize accurate scheduling of different materials, the bearing device is provided with an electronic tag, the conveying main line and the conveying branch line are provided with a plurality of readers, and the plurality of readers are respectively arranged at the material inlet sides of the intersection. The intersections refer to intersections of different types of conveyor lines, such as intersections of main conveyor lines and branch conveyor lines, intersections of branch conveyor lines and buffer conveyor lines. Generally, intersections have 2-4 sides, and with reference to the direction of material entering the processing station (i.e., the direction of movement of the carrier), intersections have one material entry side, one material exit side, and at least one extraneous side.

The intersection is provided with a steering device, and the steering device is used for adjusting the running direction of the bearing device so as to transfer the bearing device from the feeding conveying line to the conveying main line, or from the conveying main line to the conveying branch line, or from the conveying branch line to the cache conveying line. Exemplarily, turn to the device and include liftable transfer chain and liftable baffle, liftable transfer chain is located the below of intersection department transfer chain, and intersection department transfer chain is one of carrying thread, transfer branch line, and liftable transfer chain is the relative intersection department transfer chain lift, and its traffic direction is the same with another traffic direction, and liftable baffle sets up in the crossing and the relative side of material entering side. In this embodiment, the steering device is disposed below the branch conveying line, the branch conveying line runs upward, and the main conveying line runs left/right, so that the steering direction of the steering device is the same as the running direction of the main conveying line. The conveying main line or the conveying branch line generally adopts a roller path conveying line, and the liftable conveying line can adopt a chain conveying line, so that the chain conveying line can be arranged to lift between roller paths. It can be understood that, in order to avoid the operation conflict of the carrying devices on the conveying main line, the conveying main line can be set to perform unidirectional operation within a specified time.

In order to realize that a plurality of bearing devices closely move around in proper order, avoid it to block up at the crossing, carry thread and branch line all to include the conveying unit, the conveying unit gets into the side setting near the material at crossing, and the conveying unit orientation has connected gradually first transfer chain, second transfer chain and third transfer chain towards the direction that deviates from the crossing, and the length of first transfer chain is the same with the length that bears the weight of the device, reads the ware and sets up between first transfer chain and second transfer chain. Meanwhile, it can be understood that the lengths of the second conveying line and the third conveying line are both longer than the length of one carrying device.

In this embodiment, as shown in fig. 1, the conveyor lines 101 to 113 form an area a, which is an area where the feeding station and the feeding conveyor line are located; the 201-217 conveying line forms a B area, namely an area where the main conveying line is located; the 301-320 conveying lines form a C area, the 401-424 conveying lines form a D area, the 501-524 conveying lines form an E area, and the C area, the D area and the E area are the conveying branch lines, the buffer conveying lines and the areas where the processing stations are located. The feeding station can also comprise a conveying line, and the conveying line is connected with the feeding conveying line through the feeding station conveying line. It can be understood that different conveyor lines are correspondingly provided with individually controlled motors, and the conveyor lines can be raceway conveyor lines. The main conveying line can run in both left and right directions, and the branch conveying line runs in one direction. The conveying lines 202, 206, 208, 213 and 214 on the conveying main line are first conveying lines, the conveying lines 203, 205, 209, 211 and 215 are second conveying lines, and the conveying lines 204, 210 and 216 are third conveying lines. Taking the branch line in the C-zone as an example, the conveying lines 303, 307, 311, and 315 on the branch line are the first conveying lines, the conveying lines 302, 306, 310, and 314 are the second conveying lines, and the conveying lines 301, 305, 309, and 313 are the third conveying lines.

The system also comprises a control device, wherein the control device comprises an upper computer and a lower computer which are in communication connection, and the lower computer is in communication connection with the reader and the conveying device. It can be understood that the lower computer controls the start/pause, the reversing and the like of the main conveying line, the branch conveying line, the feeding conveying line, the cache conveying line, the steering device and the like through the instruction message sent by the upper computer.

The lower computer is used for pausing the transmission line in which the rear half section of the bearing device is positioned and sending a command request message to the upper computer when the reader identifies the electronic tag on the bearing device; after receiving a command operation message sent by an upper computer, controlling the operation of the corresponding suspended conveying line and the steering device; and after the bearing device leaves the steering device, sending a state information message to the upper computer.

In this embodiment, the front and back of the carrier device 1 and the carrier device 2 are tightly moved to the right on the conveying main line, the destination is the processing station 1, and the crossing where the conveying line 201 is located is moved as an example:

s1, the carrying device 1 runs right above the readers on the 203 and 202 conveying lines, at the moment, the first half section of the carrying device 1 is located on the 202 conveying line, the second half section of the carrying device 1 is located on the 203 conveying line, and the carrying device 2 is located on the 203 conveying line. The electronic tag of the bearing device 1 is identified by the reader at the corresponding position, the lower computer responds to the identification signal, controls the 203 transmission line to pause and sends a command request message to the upper computer, and at the moment, because the 203 transmission line pauses, the bearing device 1 and the bearing device 2 on the 203 transmission line cannot continue to advance. It will be appreciated that other conveyor lines operate normally. It can be understood that, the identification ranges of the reader and the electronic tag can be set according to the requirement, in this embodiment, the electronic tag is disposed in the middle of the bottom of the carrying device, and the identification ranges of the reader and the electronic tag are set to be identifiable when the electronic tag is located right above the reader.

S2, the lower computer controls 203 the transmission line to start after receiving the command operation message sent by the upper computer, and controls the steering device to operate according to the operation direction. In this embodiment, the 201 transfer chain that turns to the device sets up in the below of 301 transfer chain, and the 201 transfer chain moves to the right, for make 1 90 of load-bearing device turn to on the 301 transfer chain, the 201 transfer chain rises to 301 transfer chain top, and the liftable baffle on 201 transfer chain right side rises. When the carrier 1 advances between the 202 and 201 conveying lines, the carrier 2 advances between the 203 and 202, at this time, the reader recognizes the electronic tag of the carrier 2, so that the lower computer controls the 203 conveying line to pause, and then the carrier 2 cannot advance continuously, and at this time, after the carrier 1 (202 and 201 conveying lines still run) advances continuously until the carrier is completely located on the 201 conveying line, the 201 conveying line descends again, so that the carrier 1 is located on the 301 conveying line. It will be appreciated that when the carrier section is on one conveyor line and the other on the other conveyor line, if any one of the conveyor lines is halted, the carrier cannot advance, and the ratio division of the carrier section can be set as desired.

The command request message comprises a request command number, an electronic tag number and a crossing position value.

Request command number: a header of the communication message, the header being a read/write attribute. The meaning of the header may be defined as desired, e.g., 1: and requesting a dispatching command of the bearing device to the upper computer. After the upper computer receives the command, giving 0 to represent that the upper computer successfully receives the command according to algorithm judgment; the token 2 represents an upper computer to enable the bearing device to wait in place. The opportunity is mature, for example, in response to a status information message, the command request message is sent again.

And (4) numbering the electronic tag: this message has read-only properties. And binding the corresponding material in the upper computer database, enabling the material to reach a cache conveying line of the corresponding processing station, and entering a production link.

And (3) crossing positions: the serial number of the steering device or the serial number of the first transmission line, and the message has read-only property.

The command operation message comprises an electronic tag number, an operation direction, a destination and a next intersection position value. This message is read-only.

The electronic tag number is as follows: the number of the electronic tag in the command request message of the lower computer is the same as that of the electronic tag in the command request message of the lower computer, otherwise, the lower computer considers that the illegal message is received and reports an error.

The running direction is as follows: at the intersection, 3 directions of travel, 1: straight line, 2: left row, 3: and (6) the right row.

Destination: the number of the processing station which the bearing device finally arrives at is used for checking the running track of the lower computer, when the bearing device arrives at the processing station, the checking is that the number is not the processing station number sent by the upper computer, otherwise, an error is reported.

Next intersection position value: the next crossing position after the crossing is passed. And the lower computer is used for calculating the number of the bearing devices on the conveying line between the two road junctions according to the road junction position value corresponding to the same electronic tag number and the next road junction position value. That is, according to the data, the lower computer can calculate the number of the carrying devices on the conveying line from the intersection to the next intersection so as to control the operation of the section of the conveying line, and when no carrying device passes through the conveying line, the lower computer can stop the conveying line. The carrier is read by the reader each time it reaches an intersection. And according to the read electronic tag numbers, the lower computer sends communication messages to the upper computer, and the upper computer knows the position of each bearing device and calculates to obtain whether the bearing device can continuously run to the destination. It will be appreciated that the number of carriers on the conveyor line is reduced by one when the carriers reach the next intersection.

The state information message comprises crossing zone bits and electronic tag numbers.

Passing through the intersection marker position: the header is read/write attribute, 1 represents that the bearing device passes through the intersection, and the upper computer assigns 0 to the message header after successfully receiving the information.

And (4) numbering the electronic tag: read-only attribute, number by electronic label of crossing. The number of the command operation message is the same as the number of the electronic tag of the command operation message sent by the upper computer.

In this embodiment, the lower computer may be a PLC, and preferably employs siemens S7-1500 and a distributed I/O product, and controls the input/output point in an S7 communication manner. Low-voltage components such as a circuit breaker, a contactor and a relay are products of Schneider company. Meanwhile, the lower computer can be connected with sensors arranged at different positions of the conveying line.

The main conveying line is preferably a roller conveying line, and a control motor of the main conveying line can rotate positively and negatively.

Example 2:

on the basis of embodiment 1, this embodiment discloses a material scheduling method based on RFID, and the method adopts the material scheduling system of embodiment 1, and the method includes:

responding to the reader to identify the electronic tag on the bearing device, controlling the transmission line where the rear half section of the bearing device is positioned to pause by the lower computer, and sending a command request message to the upper computer;

receiving a command running message issued by an upper computer, and controlling the operation of the correspondingly suspended conveying line and the steering device according to the command running message;

and responding to the condition that the bearing device leaves the intersection, and sending a state information message to the upper computer by the lower computer.

In conclusion, the conveying device is adopted to connect the feeding station and the processing station, the carrying device is provided with the electronic tag, and the conveying device is provided with the reader, so that the automatic transfer of materials is realized, the working strength of workers is reduced, the working safety of the workers is improved, and the sanitation condition of the materials is improved; in addition, the plurality of feeding stations are arranged on the side edge of the main conveying line, so that feeding of a plurality of feeding points is realized, and the material dispatching efficiency is improved; simultaneously, this application has realized in advance before transporting the material to the processing station through set up the buffer memory transfer chain between branch of delivery line and processing station, has improved the continuity of processing, and then has improved machining efficiency.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A material scheduling system based on RFID is characterized by comprising a plurality of feeding stations, a plurality of processing stations and a conveying device;

the conveying device comprises a plurality of conveying lines, the plurality of conveying lines comprise a conveying main line, a plurality of conveying branch lines connected to the side edge of the conveying main line and a plurality of cache conveying lines connected to the side edges of the conveying branch lines, the plurality of loading stations are arranged on the side edge of the conveying main line, and the plurality of processing stations are arranged on the side edge of the cache conveying lines;

the material loading device is characterized in that a plurality of loading devices used for loading materials are arranged on the conveying device, the loading devices are driven by the conveying device to transfer the materials of the loading stations to the corresponding processing stations, electronic tags are arranged on the loading devices, a plurality of readers are arranged on the conveying main line and the conveying branch line, and the readers are arranged on the material inlet sides of the intersections respectively.

2. The RFID-based material dispatching system of claim 1, wherein the plurality of conveying lines further comprise a feeding conveying line, two ends of the feeding conveying line are respectively connected with the feeding station and the conveying main line, and a reader is arranged at one end of the feeding conveying line close to the conveying main line.

3. The RFID-based material scheduling system of claim 1, wherein a reader is disposed proximate the loading station.

4. The RFID-based material scheduling system of claim 1, wherein the intersection is provided with a steering device for adjusting the running direction of the carrying device.

5. The RFID-based material dispatching system of claim 4, wherein the main conveying line and the branch conveying line each comprise a conveying unit, the conveying unit is arranged close to the material inlet side of the intersection, the conveying unit is sequentially connected with a first conveying line, a second conveying line and a third conveying line in the direction away from the intersection, the length of the first conveying line is the same as that of the carrying device, and the reader is arranged between the first conveying line and the second conveying line.

6. The RFID-based material scheduling system of claim 5, further comprising a control device, wherein the control device comprises an upper computer and a lower computer which are in communication connection, and the lower computer is in communication connection with the reader and the conveying device.

7. The RFID-based material scheduling system of claim 6, wherein the lower computer is configured to suspend the conveyor line in which the second half of the carrying device is located and send a command request message to the upper computer when the reader identifies the electronic tag on the carrying device;

after receiving a command operation message sent by the upper computer, controlling the operation of the transmission line and the steering device which are correspondingly suspended;

and after the bearing device leaves the steering device, sending a state information message to the upper computer.

8. The RFID-based material scheduling system of claim 7, wherein the command request message comprises a request command number, an electronic tag number, and an intersection position value, the command run message comprises an electronic tag number, a run direction, a destination, and a next intersection position value, and the status information message comprises a pass intersection flag and an electronic tag number.

9. The RFID-based material dispatching system of claim 8, wherein the lower computer is configured to calculate the number of the carrying devices on the conveying line between two gates according to the crossing position value and the next crossing position value corresponding to the same electronic tag number.

10. An RFID-based material scheduling method, characterized in that a material scheduling system according to any one of claims 6-8 is used, and comprises:

responding to the reader to identify the electronic tag on the bearing device, controlling the suspension of the conveying line in which the rear half section of the bearing device is located by the lower computer, and sending a command request message to the upper computer;

receiving a command operation message issued by the upper computer, and controlling the operation of the correspondingly suspended conveying line and the steering device according to the command operation message;

and responding to the situation that the bearing device leaves the intersection, and sending a state information message to the upper computer by the lower computer.

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