CN114988036B - Workshop semi-finished product transportation method based on Internet of things - Google Patents

Workshop semi-finished product transportation method based on Internet of things Download PDF

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CN114988036B
CN114988036B CN202210635799.6A CN202210635799A CN114988036B CN 114988036 B CN114988036 B CN 114988036B CN 202210635799 A CN202210635799 A CN 202210635799A CN 114988036 B CN114988036 B CN 114988036B
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time
transportation
semi
procedure
trolley
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CN114988036A (en
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孙启朋
郑宪龙
丁妞妞
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Jining Haifu Electronic Technology Co Ltd
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Jining Haifu Electronic Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G35/00—Mechanical conveyors not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G1/00—Storing articles, individually or in orderly arrangement, in warehouses or magazines
    • B65G1/02—Storage devices
    • B65G1/04—Storage devices mechanical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G1/00—Storing articles, individually or in orderly arrangement, in warehouses or magazines
    • B65G1/02—Storage devices
    • B65G1/04—Storage devices mechanical
    • B65G1/137—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed
    • B65G1/1373—Storage devices mechanical with arrangements or automatic control means for selecting which articles are to be removed for fulfilling orders in warehouses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Factory Administration (AREA)

Abstract

The application discloses a workshop semi-finished product transportation method based on the Internet of things, which relates to the technical field of semi-finished product transportation and comprises the following steps: setting a feeding point position, a discharging point position and a waiting point position of a transportation trolley at a preset position close to each processing device of a workshop; importing the position information of the feeding point position, the discharging point position and the waiting point position of the transportation trolley to a data processing center; the method comprises the steps of acquiring the running time of each processing device for a plurality of times through a data acquisition center, and generating the average running time of the corresponding processing device; and controlling a semi-finished product transportation path scheme with shortest execution time of the transportation trolley based on a plurality of task instructions sent by the data processing center at the same time. The semi-finished product transportation method can effectively reduce labor cost, reduce labor intensity, improve work efficiency and reduce loss rate caused by manual transportation by optimizing productivity and improving resource utilization rate based on big data of the Internet of things.

Description

Workshop semi-finished product transportation method based on Internet of things
Technical Field
The invention relates to the technical field of semi-finished product transfer, in particular to a workshop semi-finished product transportation method based on the Internet of things.
Background
For manufacturing enterprises, raw materials or blanks need to be processed for a long time in different steps or working procedures, and finally, high-quality products can be obtained. At present, in the aspect of production, the automation of production is basically realized, but the informatization and automation level of semi-finished product transportation in a workshop is generally not high, and a manual transportation mode is mostly adopted, so that the defects of high labor cost, high labor intensity, low working efficiency, high loss rate and the like exist, and the requirements of promoting the core competitiveness of enterprises at present are more and more difficult to meet.
Disclosure of Invention
The invention has the advantages that the semi-finished product transportation method based on the Internet of things can automatically control the semi-finished product transportation path scheme with the shortest execution time of the transportation trolley when a plurality of task instructions are provided, so that the purpose of transporting semi-finished products in the workshop is achieved in the shortest time, the automation level is high, the labor cost can be effectively reduced, the labor intensity is reduced, the working efficiency is improved, and the loss rate caused by manual transportation is reduced by optimizing the productivity and improving the resource utilization rate based on the big data of the Internet of things.
The invention has the advantages that the workshop semi-finished product transportation method based on the Internet of things is provided, wherein the standby time and the production time of each processing device are updated in real time in the production process based on the difference of semi-finished product materials and the difference of processing devices, the average running time of the processing devices can be updated on line, the semi-finished product transportation path scheme with the shortest time can be controlled to be executed all the time by a transportation trolley, and the efficient transportation efficiency is ensured.
The invention has the advantages that the workshop semi-finished product transportation method based on the Internet of things is provided, wherein the prefabricated instructions can be formed through the issuing of the auxiliary task instructions and the adjustable design of the auxiliary task instructions, so that the processing work efficiency of the data processing center and the control accuracy of the data processing center are effectively improved.
In order to achieve at least one advantage of the invention, the invention provides a workshop semi-finished product transportation method based on the Internet of things, which comprises the following steps:
setting a feeding point position, a discharging point position and a waiting point position of a transportation trolley at a preset position close to each processing device of a workshop;
importing the position information of the feeding point position, the discharging point position and the waiting point position of the transportation trolley to a data processing center;
the method comprises the steps of acquiring the running time of each processing device for a plurality of times through a data acquisition center, and generating the average running time of the corresponding processing device;
based on a plurality of task instructions sent by the data processing center at the same time, controlling a semi-finished product transportation path scheme with shortest execution time of the transportation trolley, wherein the shortest time consumed by the semi-finished product transportation path scheme is as follows:
，
wherein x is 1m 、x 2m 、x km Respectively the time consumed by the transportation trolley to move from the current position to the mth equipment of the 1 st procedure, the mth equipment of the 2 nd procedure and the mth equipment of the k procedure;
x 1，m 、x 2，m 、x k，m the waiting time of the transport trolley at the mth equipment of the 1 st procedure, the mth equipment of the 2 nd procedure and the mth equipment of the k procedure is respectively;
x 2，n 、x 3，n 、x k+1，n waiting time of the transport trolley at the nth equipment of the 2 nd procedure, the nth equipment of the 3 rd procedure and the nth equipment of the k+1th procedure respectively;
x 1m，2n 、x 2m，3n 、x km，(k+1)n respectively the time consumed by the transport trolley from the mth equipment of the 1 st procedure to the nth equipment of the 2 nd procedure, the transport trolley from the mth equipment of the 2 nd procedure to the nth equipment of the 3 rd procedure and the transport trolley from the mth equipment of the k procedure to the (k+1) th procedure;
wherein each semi-finished product conveying path scheme corresponds to each task instruction, the running speed of the conveying trolley is the same, and the moving path of the conveying trolley between every two processing devices is preset.
According to the embodiment of the invention, the running time of each processing device is the sum of the standby time and the production time, wherein the standby time is the time from the start-up of the device to the satisfaction of the preset production condition, and the production time is the time from the start of the production operation of the device to the satisfaction of the production.
According to the embodiment of the invention, based on the difference of the semi-finished product materials and the difference of the processing equipment, the standby time and the production time of each processing equipment are updated in real time in the production process, and are transmitted to the data processing center through the data acquisition center, and the standby time and the production time are set to zero through a PLC (programmable logic controller) program built in the processing equipment after each batch of semi-finished product materials are processed.
According to an embodiment of the present invention, the data processing center further includes a sub-task instruction when each task instruction is issued, wherein the sub-task instruction is a next instruction issued based on an expected completion time corresponding to the task instruction, and the sub-task instruction is an adjustable instruction so that the sub-task instruction can be redistributed based on a shortest time consumed by the semi-finished goods transportation path scheme when a deviation occurs between the expected completion time and an actual completion time of the task instruction.
According to an embodiment of the invention, the minimum time that the semi-finished transportation path solution consumes when all transportation carts are executing the task order also comprises the estimated remaining time for each transportation cart to complete the task order.
According to the embodiment of the invention, the transportation trolley waiting point is suitable for accommodating one transportation trolley, the transportation trolley is provided with a positioning sensor, and the feeding point position, the discharging point position and the transportation trolley waiting point are respectively provided with a feeding level sensor, a discharging level sensor and a waiting level sensor which are matched with the positioning sensor.
According to an embodiment of the invention, each processing device is provided with a limiting device at the feeding point and the discharging point, and the limiting device is provided with a storage disc suitable for being transported by the transportation trolley.
According to an embodiment of the invention, the limiting device is implemented as a limiting frame or a limiting seat and comprises a base and a side wall plate, wherein a transfer groove suitable for accommodating a conveying arm of the transport trolley is formed at the top of the base near the middle part, the side wall plate integrally extends upwards from the top of the base and is matched with the base to form a storage space suitable for placing the storage disc, one end of the transfer groove is closed by the side wall plate, and the other end of the transfer groove is arranged in an open mode.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description.
Drawings
Fig. 1 shows a schematic flow chart of a workshop semi-finished product transportation method based on the internet of things.
Fig. 2 shows a schematic structural view of the limiting device in the present application.
Reference numerals: 10-limiting device, 11-base, 12-side coaming, 101-transfer groove, 102-storage space.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be appreciated by those skilled in the art that in the disclosure of the present specification, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, the above terms should not be construed as limiting the present invention.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
In the process of machining or processing raw materials or blanks into finished products in workshops, manufacturing enterprises may need to perform machining in a plurality of working procedures, and a plurality of different types of machining equipment are arranged in each working procedure so as to respectively realize respective machining functions. In general, each processing equipment can realize automatic operation to realize automatic feeding and automatic discharge through taking or supplementary complex manipulator, in addition, in the transportation operation of semi-manufactured goods, because workshop operating mode or environment are complicated, adopt the mode of manual transportation to carry out under the general circumstances, make the cost of labor of enterprise high, workman intensity of labour is great, but semi-manufactured goods transport efficiency is comparatively low, and manual transportation still brings extra damage for the product relatively automatic transportation easily simultaneously, increases the loss rate. In addition, there are also some enterprises that adopt the AGV dolly to carry out the transportation of semi-manufactured goods, generally set up predetermined track under the prerequisite that has better operating mode between two processing equipment, supply the AGV dolly to walk, and the AGV dolly can only realize the directional transportation between these two equipment, outside the transportation time, perhaps need not transport when transporting, the AGV dolly keeps in standby state, and resource vacancy is great. How realize that the travelling bogie carries out effective transportation in the workshop is one of the purpose of this application, wherein effective transportation is including not only transporting between two processing equipment, can also all can transport between all processing equipment, in addition, effective transportation still includes when a plurality of equipment all have the transportation demand, and the travelling bogie can be controlled to execute the shortest semi-manufactured goods transportation route scheme of time, so, the travelling bogie is after accomplishing the task of transporting at present, can be faster input to new transportation work in, and then reaches optimizing productivity, improves the purpose of resource utilization.
Referring to fig. 1 and 2, a method for transporting a semi-finished product of a workshop based on the internet of things according to a preferred embodiment of the present invention will be described in detail below, wherein the method for transporting a semi-finished product of a workshop based on the internet of things mainly comprises the following steps:
s101, setting a feeding point position, a discharging point position and a waiting point position of a transport trolley at a preset position close to each processing device of a workshop;
s102, importing the position information of the feeding point position, the discharging point position and the waiting point position of the transportation trolley and the production process flow data to a data processing center, wherein in general, the process flow of each product from a blank to a finished product is fixed or is changed every time through updating or other forms of improvement, once the product is determined, the production process flow is determined, and the corresponding production process flow data can be imported to the data processing center based on the type of the product to be processed;
s103, collecting the running time of each processing device for a plurality of times through a data collection center to generate the average running time of the corresponding processing device, wherein the running time of each processing device is the sum of standby time and production time, the standby time is the time from when the device is started to when the preset production condition is met, the production time is the time from when the device just starts to run to when the production is met, specifically, the data processing center continuously accumulates the time according to each batch of production, then calculates the average value of the time, the calculated average value is a reference value of the next completion time, and the reference value is not greatly different from the actual value to be completed next time; i.e. device average run timeWherein i represents a batch of material;
s104, controlling a semi-finished product transportation path scheme with shortest execution time of the transportation trolley based on a plurality of task instructions sent by the data processing center at the same time, wherein the shortest time consumed by the semi-finished product transportation path scheme is as follows:
，
wherein x is 1m 、x 2m 、x km Respectively the time consumed by the transportation trolley to move from the current position to the mth equipment of the 1 st procedure, the mth equipment of the 2 nd procedure and the mth equipment of the k procedure;
x 1，m 、x 2，m 、x k，m the waiting time of the transport trolley at the mth equipment of the 1 st procedure, the mth equipment of the 2 nd procedure and the mth equipment of the k procedure is respectively;
x 2，n 、x 3，n 、x k+1，n waiting time of the transport trolley at the nth equipment of the 2 nd procedure, the nth equipment of the 3 rd procedure and the nth equipment of the k+1th procedure respectively;
x 1m，2n 、x 2m，3n 、x km，(k+1)n respectively the time consumed by the transport trolley from the mth equipment of the 1 st procedure to the nth equipment of the 2 nd procedure, the transport trolley from the mth equipment of the 2 nd procedure to the nth equipment of the 3 rd procedure and the transport trolley from the mth equipment of the k procedure to the (k+1) th procedure;
wherein each semi-finished product transportation path scheme corresponds to each task instruction, and simultaneously, the operation speed of the transportation trolley is the same, and meanwhile, the movement path of the transportation trolley between every two processing devices is preset.
It should be noted that each semi-finished product transportation path scheme corresponds to each task instruction, that is to say: in the continuous processing process of the whole workshop, the semi-finished product transferring requirements can exist for different equipment in different working procedures, when the data processing center simultaneously sends out a plurality of task instructions, the semi-finished product transferring requirements are met for at least two pieces of equipment, namely, the requirements for a transportation trolley are met, the positions of at least two pieces of equipment are different, the destination of the semi-finished product to be transferred after the processing is finished can be different, a plurality of semi-finished product transportation path schemes can be formed, the consumed time of each semi-finished product transportation path scheme can be different, the problem of high resource utilization rate can be caused, based on the technical problems, the problem of high resource utilization rate can be solved, the labor-saving manual work-saving method can be realized by setting fixed feeding points, blanking points and transportation trolley waiting points in the vicinity of each piece of equipment, introducing the position information and the production process flow data corresponding to the product to be processed into the data processing center, based on the production process flow data, the transportation trolley can be moved to the next processing equipment through a preset path, and simultaneously, based on the working time of each semi-finished product to the semi-finished product can be calculated, the labor-finished product can be saved, the labor-saving time can be greatly reduced, the labor-saving can be greatly, the labor-saving can be saved, the labor-saving can be greatly is greatly reduced, the time can be saved when the manual transfer is calculated and the working time is greatly, and the labor-saving and the finished product is required to be compared with the transportation and the task-saving and has high-saving time and time, the loss rate of the semi-finished product is reduced.
For example, when the data processing center issues two task instructions simultaneously, the first task instruction is a task instruction for CNC processing the glass cover plates of the first batch to be completed and transferring the glass cover plates to be transferred, and the second task instruction is a task instruction for the ultrasonic cleaning equipment to be cleaned and transferred to the grinding and polishing equipment;
assume that: production time t for CNC processing of first batch of glass cover plates 11 The time required for feeding or other work during processing is standby time t =30min 12 Obtain the device running time T =5 min 1 Device average run time t=35 min 1 =35 min; the predicted CNC machining time Ty=35 min of the next batch of glass cover plates;
when the data processing center monitors that CNC predicts the residual processing completion time to be 7min, a task instruction is sent to a transport trolley A in a trolley placement area, and the time required for the transport trolley A to reach the 1 st equipment in the 3 rd procedure from the trolley placement area is x 3 ＝L 1 /v＝160/40＝4min；
The waiting time of the transportation trolley A at the waiting point of the transportation trolley of the 1 st equipment in the 3 rd procedure is as follows:
x 3，1 ＝7-x 3 ＝3min；
the transportation trolley A takes x time from the 1 st equipment of the 3 rd working procedure to the 1 st equipment of the 4 th working procedure 31,41 ＝5min；
The 4 th procedure, the 1 st equipment predicts the residual processing completion time to be 5min;
the waiting time of the transportation trolley A at the waiting point of the transportation trolley of the 1 st equipment in the 4 th working procedure is as follows:
x 4，1 ＝5-x 31,41 ＝0min；
calculating the time consumption of the semi-finished product transportation path scheme aiming at the first task instruction as
X 3 ＝x 3 +x 3，1 +x 31,41 +x 4，1 ＝12min；
Similarly, when the data processing center monitors that the ultrasonic cleaning equipment predicts the remaining processing completion time of 7min, the time x required for the transport trolley A to reach the 3 rd equipment in the 3 rd working procedure is calculated 3 ’＝L 1 /v＝160/40＝4min；
The waiting time of the transportation trolley A at the waiting point of the transportation trolley of the 3 rd equipment in the 4 th working procedure is as follows:
x 3，3 ＝7-x 3 ’＝3min；
the transportation trolley A takes x time from 3 rd step 3 equipment to 2 nd step 4 equipment 33,42 ＝5min；
The 5 th procedure, 1 st equipment predicts a residual processing completion time of 6min
The waiting time of the transportation trolley A at the waiting point of the transportation trolley of the equipment 1 in the 5 th working procedure is as follows:
x 4，2 ＝6-x 33,42 ＝1min；
calculating the time consumption of the semi-finished product transportation path scheme aiming at the second task instruction as
X 3 ’＝x 3 ’+x 3，3 +x 33,42 +x 4，2 ＝13min
At this time, take X 3 ，X 3 And (3) controlling the transport trolley A to execute the semi-finished product transport path scheme corresponding to the first task instruction as the optimal transport scheme of the transport trolley A for a minimum value of 12 min.
As a preferred embodiment, based on the difference of the semi-finished products and the difference of the processing equipment, the standby time and the production time of each processing equipment are updated in real time in the production process and transmitted to the data processing center through the data acquisition center, and the standby time and the production time are set to zero through a built-in PLC program of the processing equipment after each batch of semi-finished products are processed, so that the validity of the semi-finished product transportation path scheme with the shortest time consumption can be maintained.
Further preferably, the data processing center issues each task instruction with a sub-task instruction, wherein the sub-task instruction is a next instruction issued based on an expected completion time corresponding to the task instruction, and the sub-task instruction is an adjustable instruction, wherein the adjustable instruction refers to: when the predicted completion time and the actual completion time of the task instruction deviate, for example, the predicted completion time is 15min, and the actual completion time may need 20min, in this case, there is a problem that the transportation trolley is empty, so that the resource utilization rate is reduced, and at this time, the sub task instruction is redistributed to other transportation trolleys based on the shortest time consumed by the semi-finished transportation path scheme, which is equivalent to the task redistribution. In this way, when the predicted completion time is the same as the actual completion time, or only a small deviation exists, such as a deviation of 10 seconds or 25 seconds, the transportation trolley directly executes the corresponding auxiliary task instruction after the task instruction is executed, so that the data processing center can form a prefabricated instruction, future work can be planned in advance, and when a problem or a fault occurs in a short time, the transportation work of the transportation trolley is not influenced, thereby effectively improving or ensuring the efficiency of the processing work of the data processing center and the control accuracy of the data processing center. In addition, when the expected completion time and the actual completion time have larger deviation, by reassigning the auxiliary task instruction, remedial measures can be formed for the prefabricated instruction, so that the maximum utilization of the transport trolley is ensured, and the efficiency of transferring the semi-finished product is ensured.
Further preferably, the minimum time that the semi-finished transportation path plan consumes when all the transportation carts are executing the task instructions further comprises the estimated remaining time for each transportation cart to complete the task instructions.
Further preferably, the trolley waiting point is adapted to accommodate a trolley. The positioning sensor is installed to the travelling bogie, simultaneously, the material loading position the unloading position with travelling bogie waiting position be provided with respectively with positioning sensor matched with material loading level sensor, unloading level sensor and waiting position sensor to ensure that the travelling bogie can be accurate start stop in place.
Further preferably, each processing device is provided with a limiting device at the feeding point position and the discharging point position, so that the accuracy of the starting and stopping positions of the transport trolley is further ensured, and meanwhile, a storage disc suitable for being transported by the transport trolley is placed on the limiting device and used for storing semi-finished products to be transported.
Further preferably, the limiting device 10 is implemented as a limiting frame or a limiting seat, and includes a base 11 and a side wall plate 12, wherein a transfer slot 101 adapted to accommodate a conveying arm of the transportation trolley is formed near the middle part of the top of the base 10, meanwhile, the side wall plate 12 integrally extends upwards from the top of the base 10 and forms a storage space 102 adapted to be placed with the storage tray in cooperation with the base 10, meanwhile, the left end of the transfer slot 101 is closed by the side wall plate 12, and the opposite right end is provided in an open type. Thus, when the semi-finished products in the storage tray of the storage space 102 are accumulated to a certain amount or volume and need to be transferred, the conveying arm of the conveying trolley extends into the transferring groove 101, and then the storage tray is lifted upwards together, so that the semi-finished products can be transferred to the next station along with the storage tray, and the storage tray is placed in the storage space 102 of the next station.
It should be noted that, as the prior art, the transport cart may be an AGV cart, and the data collection center and the data processing center are also prior art, and no improvement to the relevant computer program exists.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.

Claims (8)

1. The workshop semi-finished product transportation method based on the Internet of things is characterized by comprising the following steps of:
setting a feeding point position, a discharging point position and a waiting point position of a transportation trolley at a preset position close to each processing device of a workshop;
importing the position information of the feeding point position, the discharging point position and the waiting point position of the transportation trolley to a data processing center;
the method comprises the steps of acquiring the running time of each processing device for a plurality of times through a data acquisition center, and generating the average running time of the corresponding processing device;
based on a plurality of task instructions sent by the data processing center at the same time, controlling a semi-finished product transportation path scheme with shortest execution time of the transportation trolley, wherein the shortest time consumed by the semi-finished product transportation path scheme is as follows:
，
wherein x is 1m 、x 2m 、x km Respectively the time consumed by the transportation trolley to move from the current position to the mth equipment of the 1 st procedure, the mth equipment of the 2 nd procedure and the mth equipment of the k procedure;
x 1，m 、x 2，m 、x k，m the waiting time of the transport trolley at the mth equipment of the 1 st procedure, the mth equipment of the 2 nd procedure and the mth equipment of the k procedure is respectively;
x 2，n 、x 3，n 、x k+1，n waiting time of the transport trolley at the nth equipment of the 2 nd procedure, the nth equipment of the 3 rd procedure and the nth equipment of the k+1th procedure respectively;
x 1m，2n 、x 2m，3n 、x km，(k+1)n respectively the time consumed by the transport trolley from the mth equipment of the 1 st procedure to the nth equipment of the 2 nd procedure, the transport trolley from the mth equipment of the 2 nd procedure to the nth equipment of the 3 rd procedure and the transport trolley from the mth equipment of the k procedure to the (k+1) th procedure;
wherein each semi-finished product conveying path scheme corresponds to each task instruction, the running speed of the conveying trolley is the same, and the moving path of the conveying trolley between every two processing devices is preset.
2. The method for transporting semi-finished products in workshops based on the internet of things according to claim 1, wherein the running time of each processing device is the sum of standby time and production time, wherein the standby time is the time from when the device is started to when a preset production condition is met, and the production time is the time from when the device just starts to run to when the production is met.
3. The method for transporting semi-finished products in workshops based on the Internet of things according to claim 2, wherein the standby time and the production time of each processing device are updated in real time in the production process based on the differences of the semi-finished products and the differences of the processing devices, and are transmitted to the data processing center through the data acquisition center, and the standby time and the production time are set to zero through a PLC program built in the processing device after each batch of the semi-finished products are processed.
4. The method of claim 3, wherein the data processing center issues a sub-task instruction in response to each task instruction, wherein the sub-task instruction is a next instruction issued based on an estimated completion time corresponding to the task instruction, and the sub-task instruction is an adjustable instruction to redistribute the sub-task instruction based on a shortest time consumed by the semi-finished product transportation path scheme when a deviation occurs between the estimated completion time and an actual completion time of the task instruction.
5. The method of claim 4, wherein the minimum time that the semi-finished product transportation path scheme consumes when all transportation carts are executing the task order further comprises an estimated remaining time for each transportation cart to complete the task order.
6. The workshop semi-finished product transportation method based on the internet of things according to claim 1, wherein the transportation trolley waiting point is suitable for accommodating one transportation trolley, a positioning sensor is installed on the transportation trolley, and the feeding point position, the discharging point position and the transportation trolley waiting point position are respectively provided with a feeding level sensor, a discharging level sensor and a waiting level sensor which are matched with the positioning sensor.
7. The method for transporting semi-finished products in workshops based on the internet of things according to claim 6, wherein each processing device is provided with a limiting device at the feeding point and the discharging point, and the limiting device is provided with a storage tray suitable for being transported by the transport trolley.
8. The method for transporting semi-finished products in workshops based on the internet of things according to claim 7, wherein the limiting device is implemented as a limiting frame or a limiting seat and comprises a base and a side wall plate, wherein a transfer groove suitable for accommodating a conveying arm of the transport trolley is formed at the top of the base near the middle, the side wall plate integrally extends upwards from the top of the base and is matched with the base to form a storage space suitable for placing the storage disc, one end of the transfer groove is closed by the side wall plate, and the other end of the transfer groove is arranged in an open mode.
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Denomination of invention: Workshop semi-finished product transportation method based on the Internet of Things

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