CN110009180B

CN110009180B - Punctual production control method based on block chain

Info

Publication number: CN110009180B
Application number: CN201910061234.XA
Authority: CN
Inventors: 谢兆贤; 倪建成; 高仲合; 高峰; 柯志鸿; 谢和峰
Original assignee: Qufu Normal University
Current assignee: Anhui Hefeng Supply Chain Holdings Co.,Ltd.
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2020-12-22
Anticipated expiration: 2039-01-23
Also published as: CN110009180A

Abstract

The invention discloses a block chain-based punctual production control method, which comprises the following steps: 1) the method comprises the steps of establishing a block chain main chain in the production process by taking each process as a unit, setting logistics nodes with the number corresponding to the processes, establishing a production relationship among adjacent logistics nodes, judging whether the production conditions of the logistics nodes in the subsequent process are met or not at present after the logistics nodes in the prior process acquire and execute the task requests of the logistics nodes in the subsequent process, acquiring the proportion L of the output of each sub-chain of the logistics nodes in the prior process by utilizing a workload-proven consensus mechanism, feeding back the semi-finished product input proportion of each sub-chain according to the acquired proportion L, preferentially supplying the semi-finished products in sequence, referring to the block chain technology, rapidly solving the state of response on-time production by using a distributed architecture, providing suppliers, customers and production personnel with knowledge about the production state, not only keeping the safety of each sub-chain, but also facilitating real-time management (high reliability) of production, further reducing production and inventory costs.

Description

Punctual production control method based on block chain

Technical Field

The invention relates to the field of information management, in particular to a block chain-based punctual production control method.

Background

Real-time production technology (JIT), also known as Just-in-time production, is a production management methodology that improves commercial return on investment by reducing inventory and associated attendant costs during production. Briefly, the main goal of just-in-time institutional is to have the right material flow to the right place at the right time, in just-good quantities.

In order to meet the aim of punctual system, the production process relies on mark symbols, or billboard management, which is used for telling workers when to proceed with the next process. Generally, the billboard may also be a simple visual symbol instead. JIT can help enterprises to continuously improve production processes, and increase return on investment, quality, efficiency, employee participation, and product flow rate of productive enterprises. And resource waste caused by inventory is reduced. The JIT inventory system recognizes that inventory represents an implicit cost, and thus efficient enterprises do not have inventory issues. First, the just-in-time production system encourages enterprises to gradually eliminate inventory, reducing costs in the production flow. Then, the management is gradually adapted to the "zero stock" state.

Three principles of cost reduction and waste reduction are formulated by a punctual production system.

One, time cost-time wasted in the manufacturing process.

Second, inventory cost-product retained during manufacturing.

Third, idle cost — in the state where the machine cannot move during the manufacturing process, the machine is still in idle running continuously.

The conventional production method is a push-type production, such as the conventional manufacturing flow chart of fig. 1. FIG. 2 is a flow chart of the manufacture of Just In Time (JIT) during the pull-type production process, In which the input semi-finished product is obtained from the back end to the front end. This production method has two characteristics, (1) one-to-one; (2) just the demand can both be on time, reduces the stock and reaches and reduce whole manufacturing cost.

But JIT production suffers from (1) a delay in the last station that causes downtime. (2) The productivity increase of the last station causes a disadvantage of increase of WIP (semi-finished product). And the problem of delay therein cannot be dealt with.

And the improvement of JIT will cause a new problem as shown in fig. 3. For example: problem condition after JIT improvement. The groups S21 and S22 have two states, one is to produce the same product, in order to accelerate the production efficiency. Another is to produce different products in order to be assembled into a semi-finished product at the next station. And thirdly, the workstations in the same level can mutually support production. The first state is considered by this patent because it is most widely used. Here, S41, S42, and S43 are the same group. S5 will ask series S4 for the desired product and quantity; the S4 series will require the required product and quantity from S3, distributed to the workstations within the series; s3 will ask series S2 for the desired product and quantity; the S2 series will require the desired product and quantity from S1, distributed to the stations within the series. The whole production mode belongs to JIT pull type production, and a semi-finished product is input from the back end like the front end with a first-level requirement.

Continuing with the above example, the requirement of S5 is 10, and three jobs S41, S42, S43 are required to satisfy the total of 10 in total production quantity. Perhaps the average production volume is predicted to be (x ', y ', z ') = (3, 3, 4), but the actual production volume will not be readily known. The reason is that the number of semifinished products (x, y, z) respectively input is not easily measured, and we know that x + y + z should be at least 10, which would be expected to meet the requirement of S5 without any disadvantages.

The following two models can be derived from the conventional just-in-time production system.

Supplier management inventory

The principles of Vendor Managed Inventory (VMI) are similar to those of just-in-time production regimes. The person managing the inventory is the retailer and not the producer, and the ultimate management role is attributed to the retailer, whether the producer manages the inventory of the retailer or the retailer manages the inventory of the producer.

The advantage of this business model is that retailers can gain experience with the production segment, allowing them to better predict the amount of demand and the inventory they need. Inventory planning and control can use simple application software to feed the inventory data of the retailer back to the production line at any time.

(II) customer management inventory

Customer Managed Inventory (CMI) systems, unlike retailers, allow customers the right to determine inventory. This is similar to the concept of an on-time production system, where large customers can predict demand and thus keep production lines and retailers aware of at any time to manage inventory.

Both of the above methods require a centralized host to be built for service. The problem of centralized computing still exists, if in a large manufacturing environment, hundreds of workstations, thousands of component manufacturing environments, such as automobiles, are required. The problem of punctual access to the data will be excessive, and if the computing power of the host server is insufficient or the database has poor performance in processing the excessive data, the problem will be serious. In addition, each workstation will only be able to process batch-type JIT, and cannot accurately manage production quantity and set up material preparation requirements.

Disclosure of Invention

In view of the above problems, the present invention provides a block chain-based on-time production control method.

In order to achieve the above object, the present invention provides a block chain-based on-time production control method, which includes the following steps:

1) establishing a block chain main chain in the production process by taking each process as a unit, setting logistics nodes with the number corresponding to that of the processes, and establishing a production relation between each adjacent logistics node;

2) respectively establishing a plurality of sub-chains aiming at each process, wherein the sub-chains in the same process respectively correspond to the same logistics node;

3) the method comprises the following steps that a corresponding production relation exists between two adjacent logistics nodes, and after a logistics node in a prior process acquires and executes a task request of a logistics node in a subsequent process, whether the production condition of the logistics node in the subsequent process is met or not is judged;

4) if the production conditions of the subsequent logistics node are met, acquiring a semi-finished product of the prior logistics node at the subsequent logistics node, stopping production at the prior logistics node, and if the production conditions of the subsequent logistics node cannot be met, continuing production at the prior logistics node;

5) meanwhile, the prior logistics node sends the self data and the block hash information to the subsequent logistics node, and the subsequent logistics node stores the self data and the block hash information;

6) each logistics node at the main chain of the block chain is processed according to the steps 3) to 5) respectively to finish the production of the whole product,

simultaneously, the main chain and the sub chain of the block chain are both provided with intelligent contracts to provide the function of stock inquiry,

in the step 3), a recognition mechanism proved by workload is utilized to obtain a ratio L of the output of each subchain of the prior logistics node, and the semi-finished product input ratio of each subchain is formed by feedback according to the obtained ratio L and is preferentially supplied in sequence.

Each logistics node has an output interface for output of production data and an input interface for input of production data.

Each logistics node comprises a first block and a second block, wherein the first block is used for representing production information, and the second block is used for representing inventory information.

The first block acquires and executes the task request of the second block, and then judges whether the inventory requirement of the second block is met currently, if so, the second block acquires the semi-finished product of the first block, and meanwhile, the first block stops production, and if not, the first block continues production.

The first block is composed of a number of sub-chains.

The invention has the beneficial effects that: the technology of the block chain is introduced, the state of the on-time production is quickly reflected by a distributed architecture, a supplier, a customer and a production person are provided to know the production state, the safety of information is kept (the information is not easy to be independently modified), and the production can be conveniently managed in real time (the reliability is high), so that the production and inventory cost is further reduced.

Drawings

Fig. 1 is a schematic view of a conventional manufacturing process.

FIG. 2 is a schematic diagram of the Just In Time (JIT) manufacturing process.

Fig. 3 is a schematic diagram of an improved JIT manufacturing process.

Fig. 4 is a block chain logistics node relationship diagram.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a block chain-based punctual production control method, which comprises the following steps:

5) meanwhile, the prior logistics node sends the self data and the block hash information to the subsequent logistics node, and the subsequent logistics node stores the obtained self data and the block hash information;

and simultaneously, intelligent contracts are deployed on the main chain and the sub-chains of the blockchain, so that the inventory query function is provided.

In the same manufacturing system, no matter how many sub-workstations (same production mode) are under each workstation, a logistics node is built to participate in an intelligent contract. The forward request for new semifinished products is stopped when a sufficient total number can be collected immediately by the latter station, thereby achieving a time and yield optimized characteristic.

Each block is internally provided with a block information processing unit, and an information acquisition block base station in the block information processing unit is an information aggregation device and is used for aggregating information and establishing a corresponding Hash tree (Hash) relation for the sensing record in the range. The wireless sensor network contains the recorded contents of all the sensors in the block. The block chain encrypts transactions in a transaction block through a hash algorithm, compressing the messages into a hash string of numbers and letters. Any node in the block chain can obtain a corresponding hash value through simple hash calculation. If the computed hash value does not change, it indicates that the message in the block has not been modified. Under the sequential block setting, each block is synchronously performing their own work.

The first block is composed of a plurality of sub-chains, each sub-chain can also be provided with a main chain which is used as a final process, and the main chain is sequentially subjected to the operations, so that the block chain arrangement of the process flow of the whole process is realized.

Among the block chain theories, there is an important property. The reason for this is that the security is because of the 'consensus mechanism', in a simple way, the data in the block chain is copied to all nodes, and if someone only modifies the data on one production machine and the records on other production machines are not modified, this action will fail. Unless the data on the production machine is modified by more than 50% of all machines, the data represents consensus, and the data is successful. However, in the blockchain world, it is difficult to find 50% of the correlation and modify it, so the data is highly secure.

Although common consensus mechanisms are represented by three types of Proof of workload (Proof of Work, PoW), Proof of rights and interests (Proof of stamp, PoS), and Proof of authority of shares (DPoS). PoW is a result of the number of jobs, and PoS is divided by different weights, DPoS and PoS are similar to the weighting, and the difference is a generation block with probability variation in a predetermined time period.

Continuing with the previous two problem paradigm, the requirement of S5 is 10, requiring three jobs S41, S42, S43 to meet the total of 10. During production, we may predict that the average production is (x ', y ', z ') = (3, 3, 4), but the actual production under "consensus mechanism" will not easily match the amount we predict. Intuitively, the ratio of the number of semi-finished products input individually is x: y: z =3:3: 4. To meet the requirements of the prospective S5, our consensus mechanism invokes a workload proof method to assign x, y, z in terms of production quantities.

Therefore, including the possibility of failure, the ratio of the x, y, z quantities will be fed back to the x, y, z quantity ratio in the proportion of the quantities produced per unit time of x ', y ', z '.

For example:

(x ', y', z ') = (1,1,1), and the production amount per unit time of x', y ', z' does not exceed all 51%, then the production amount of the previous S3 is sequentially (x, y, z) = (1,1,1) to perform the dispensing of the semi-finished products.

(x ', y ', z ') = (0,2,2), the production amount per unit time of y ', z ' exceeds all 51%, and the previous production amount of S3 is sequentially (x, y, z) = (0, 1,1) to distribute the semi-finished products. Since the ratio of y to z is the same, when a product is produced in S3, it becomes (x, y, z) = (0,2, 1); similarly, if S3 reproduces a product, it becomes (x, y, z) = (0,2,2), and so on.

Example 1, the number of workstation inputs corresponds to the number of outputs. Consistent quantities represent no inventory, no defective products, and no work in process. We call stock, defective products, and Work In Process (WIP) which is the same as the work In Process, and the number of products entering the workstation is the same as the number of products exiting the workstation. Possible variations in the production process at each workstation, including quality checks, are not expected to affect the total number of products completed within a unit production. In the relationship between the S4 stations (S41, S42, S43) and S5, if S5 requires 10 semi-finished products, it may be that three sub-stations S41, S42, S43 output semi-finished products, the total number of which is at least 10. According to the production record of the block chain, the sequence is S41 → S42 → S41 → S42 → S43 → S43 → S43 → S41 → S42 → S42. In other words, regardless of the input number of the sub-stations S41, S42 and S43, when the total number reaches at least 10, the requirement will be fed back and the continuous forward lowering of the semi-finished products according to the requirements of the stations will be stopped.

In the workstation of S4, if there are several stages to record the production completion number of each sub-workstation, the production number of different stages will be different due to the change of the workstation process personnel or machine, and the manufacturing will be stopped by the feedback blockchain message when the total number received in S5 reaches 10.

If the input and output of each work station meet the state, the input of the semi-finished product process, the negative sign of which represents the insufficient quantity, can be fed back to the previous work station to require the continuous production of the residual quantity until the total quantity meets the state. 0 represents that the input meets the expected demand.

Example 2 the number of workstation inputs does not correspond to the number of outputs. Representing the existence of inventory, defective products, or work in process, i.e., the number of entries into the workstation is not equal to the number of output workstations. Even if the input of the previous sub-workstation is far more than the output, as long as the requirement of the workstation is not met, the previous workstation continuously and repeatedly requires the previous workstation to continuously input qualified semi-finished products so as to facilitate the production of the previous workstation, and the qualified semi-finished products are output to the workstation.

And the state of the input satisfaction and the output satisfaction of each work station is input into the semi-finished product process, the negative sign represents the insufficient quantity, the quantity is fed back to the last work station, and the residual quantity is required to be continuously produced until the total quantity is satisfied. 0 represents that the input meets the expected demand for the product quantity.

This case shows that processes with defective or in-process products are classified as WIP, and so the "yield to be replenished" refers to the amount of material that needs to be replenished to the next station, regardless of whether WIP is present or not, typically after the input is satisfied.

Total number of production results per unit time for each station. This time unit QUOTE

To customize the production time of a product, for example: under a work station S4 there are three sub-work stations, S41, S42, S43 for which the time to produce a semi-finished product is QUOTE

Then, on average, 3. The following is the definition and description of the relevant parameters of the workstation of S4, and so on.

(1) The inputs to the workstations S41, S42, S43 are satisfied by the quantities x ', y ', z '. x ', y ', z ' ∈ [1, ∞).

(2) The outputs of the workstations S41, S42, S43 satisfy the number x, y, z. x, y, z ∈ [1, ∞ ].

(3) Number of work in progress for workstations S41, S42, S43x _wip ，y _wip ，z _wip∈[0，∞）。

(4) According to the above relationship, x ' is not less than 1 and not more than x, y ' is not less than 1 and not more than y, and z ' is not less than 1 and not more than z.

(5) The number of workstations, x '+ y' + z '≧ a', is entered per unit time for the child workstations S41, S42, S43. The number of the work stations input in unit time is a ' (1 ≦ a ' less than b '). Where a 'is the sub-station number within the station and b' is the total number of sub-stations. a ', b'

。

(6) The sub-stations S41, S42, S43 output the number of stations x + y + z = a per unit time. The number of the output workstations per unit time is a: (

). Where a is the sub-station number within the station and b is the total number of sub-stations.

。

The procedure of the example is as follows

Step 1, creating a block chain. Each sub-station establishes a corresponding message node for an input production and an output production in accordance with the sequence of the JIT manufacturing job.

And 2, inputting the number a', a ∈ [0, ∞ ] of the workstation.

And step 3, carrying out the number a output by the workstation, wherein a belongs to [0, ∞ ].

And 4, updating the value of a'. The expected demand ρ for each workstation is known.

Step 4-1, obtaining Σ (x '+ y' + z '), obtaining x' according to the consensus mechanism of the workload certification: y': z' the proportion L, L of the production quantity is more than 51 percent,

Step 4-2, according to x': y': z', the feedback forming the semi-finished product input ratios of the various sub-stations x, y, z, to be supplied sequentially with priority.

Step 4-3, if the sum of sigma (x ' + y ' + z ') is less than 0 (the input is not satisfied); the last workstation request is fed back to make up an amount less than 0.

Step 4-4, if the sum of sigma (x ' + y ' + z ') is more than or equal to 0 (input satisfaction is achieved); the last workstation is fed back to stop production.

4-4-1, if the number of WIPs is more than 0; the last workstation request is fed back to make up the amount of WIP. The yield to be compensated is set equal to the number of WIPs.

4-4-2, if the number of WIPs is less than or equal to 0; then no consideration is needed and no inventory issues are represented.

Step 4-5, if

The total sum of (1) is more than or equal to 0 (input is achieved to meet) and the output to be compensated is less than 0; the last workstation request is fed back to make up an amount less than 0.

Step 4-6, if

The total sum of (a) is more than or equal to 0 (input is achieved to meet) and the yield to be compensated is 0; the workstation stops production.

The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A block chain-based punctual production control method is characterized in that: which comprises the following steps:

2. The block chain-based on-time production control method according to claim 1, wherein: each logistics node has an output interface for output of production data and an input interface for input of production data.

3. The block chain-based on-time production control method according to claim 1, wherein: each logistics node comprises a first block and a second block, wherein the first block is used for representing production information, and the second block is used for representing inventory information.

4. The block chain-based on-time production control method according to claim 3, wherein: the first block acquires and executes the task request of the second block, and then judges whether the inventory requirement of the second block is met currently, if so, the second block acquires the semi-finished product of the first block, and meanwhile, the first block stops production, and if not, the first block continues production.

5. The block chain-based on-time production control method according to claim 3, wherein: the first block is composed of a number of sub-chains.