JPH0760619A - Work input commanding device - Google Patents

Abstract

PURPOSE:To level input works by changing and adding a searching condition to search the input works in a work input commanding device to input the optimal work in an assembling line from plural works housed in plural storages to house temporarily the works to be carried to the assembling line from a production line by a prescribed group. CONSTITUTION:A work input commanding device has a command rule storage part 9 to store plural command rules to be applied to select works to be inputted and a higher-rank rule storage part 5 to store a higher-rank rule in which a prescribed environmental state condition and the command rules are made to correspond to each other. First of all, a command rule determining part 3 determines application order of the command rules by the higher-rank rule, and reads out the command rules from the command rule storage part 9 according to the application order, and work input is commanded by a work input commanding part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work input method in a production process, and more particularly to a work input method for improving production efficiency while maintaining the leveling of the work when the work is input to a mixed flow production line.

[0002]

2. Description of the Related Art In a factory production line, for example, a vehicle production line, a plurality of types of products are often produced on the same line in each line, and in recent years, the same production line has been produced due to diversification of consumers' tastes. High-mix low-volume production, in which the types of products produced on the line have increased in particular, has become common.

Therefore, in a production line such as a vehicle painting line or an assembly line, the production progress management of the equipment or work is performed well, and in order to improve the overall work efficiency, the vehicle work is conveyed according to each line. The order must be supplied to each line as the optimal combination.

For example, in an automobile assembly plant that produces a plurality of vehicle types and models, the order of vehicles flowing on a line is a predetermined constraint condition in order to equalize the time required for assembly work and the component consumption interval in each line. Is managed according to. That is, it is necessary that the vehicles having the same conditions are leveled so that they flow at predetermined intervals. For this reason, an optimal sequence for each line is planned in advance during production planning, and assembly is started from the body welding line in that sequence.

However, in spite of such initial setting, it is generally excluded from the line by repairing a car with poor coating quality in the middle of the painting line, returning a car, or painting a two-tone car twice. Frequent re-injection into the line. Therefore, the transportation order of vehicle work at the start of production (for example, the transportation order during body welding) is disturbed, and it is not preferable in terms of production progress management to carry the same order without change to the final line. When it is re-introduced to, it becomes necessary to re-inject into a position that does not disturb the leveling.

For this reason, in an automobile assembly plant, a plurality of storages for temporarily storing the conveyed vehicle works in predetermined groups are provided between the downstream side of a predetermined production line and the upstream side of the previous process. There is. By this storage, the vehicle work is rearranged in the transportation order so as not to disturb the leveling.

When selecting a vehicle work to be put into the next process line from this storage, Japanese Patent Publication No. 3-43114
As shown in the publication, a plurality of constraint conditions based on the vehicle type, specifications, etc. are provided, the constraint conditions are searched, and a vehicle work satisfying the constraint conditions is extracted as a candidate vehicle for insertion.

When a vehicle work satisfying the constraint is not found, the constraint is sequentially released from the condition of low importance and the input work is searched. On the other hand, when there are a plurality of candidate vehicles for introduction, the target appearance ratio is calculated for each candidate vehicle for insertion, the candidate vehicle for introduction having the maximum target appearance ratio is obtained, and the candidate vehicle for introduction is set as the introduced vehicle. .

As described above, the instruction to input the work from the storage to the assembling process is performed according to a certain rule.

[0010]

However, according to the conventional method for inserting a work into a vehicle, a predetermined condition is applied according to a predetermined order to determine the work to be inserted. In, in the storage, there is a shortage of candidate work, or a certain storage is full and the vehicle work cannot be stored in the desired storage.
There was a problem that the input work could not be leveled.

Therefore, it is an object of the present invention to provide a work input instruction device capable of leveling input work by changing or adding search conditions for searching input work. .

[0012]

First, as shown in FIG. 1, the present invention provides a plurality of storages for temporarily storing works conveyed from a predetermined production line to an assembly line in predetermined groups. In a work input instruction device for inputting an optimum work from a plurality of stored works to an assembly line, an environmental condition detecting means 1 for detecting an environmental condition including types and specifications of a work in a storage and an assembly process.
And an instruction rule storage unit 9 for storing a plurality of instruction rules applied to select a work to be input, and an upper rule memory for storing an upper rule in which a predetermined environmental condition is associated with the instruction rule. Unit 5, an instruction rule determination unit 3 that determines an instruction rule to be applied based on the environmental state detected by the environmental state detection unit 1 and the upper rule stored in the upper rule storage unit, and the instruction rule determination unit 3 The instruction rule determined by the above is read from the instruction rule storage unit 9, and a work input instruction unit 7 for issuing a work input instruction according to the instruction rule is provided.

Secondly, in the first configuration, the instruction rule sets the upper limit of the ratio in the storage for each work constraint condition including the type of work and the specification defined for selecting the input work. When the threshold value is equal to or more than the threshold value and the differential value of the ratio is positive, the work satisfying the work constraint condition is preferentially put into the assembly line, and the ratio in the storage is less than or equal to the lower limit setting threshold value. And, and
When the differential value of the ratio is negative, the ratio differential rule is characterized in that the work that satisfies the work constraint condition is prioritized to suppress the input.

Thirdly, in the above-mentioned first configuration, the instruction rule is such that each work constraint condition including the type and specification of the work defined for input work selection is stored in the storage within a certain set range time. The integral value of the ratio,
If the integrated value of the ratio in the above storage exceeds the integrated value of the ratio calculated from the specified production ratio by comparing with the integrated value of the ratio calculated from the specified production ratio, the work that satisfies the work constraint condition is given priority. It is characterized in that it is a ratio integration rule that is selected as a work.

[0015]

In the work input instruction device based on the first configuration of the present invention, the environmental condition detecting section 1 detects the environmental condition including the type and specification of the work in the storage and in the assembly process. Since the upper rule storage unit 5 stores the upper rule in which a predetermined environmental condition is associated with the instruction rule, the instruction rule determination unit 3 causes the environmental condition detection unit 1 to detect the environmental condition. And the upper storage unit 5
The instruction rule to be applied is determined according to the upper-level rule stored in. Next, since the instruction rule storage unit 9 stores a plurality of instruction rules applied to select a work to be input, the work input instruction unit 7 is determined by the instruction rule determination unit 3. The instruction rule is read from the instruction rule storage unit 9, and the work input instruction is performed according to the instruction rule.

According to the work input instruction device of the present invention, a higher order rule can be provided to change the application order according to a predetermined environmental condition, and a higher order rule can be added.
You can freely change the application order of the instruction rules by changing it, and the application order of the instruction rules is not fixed, so there is a shortage of candidate works in the storage, or a certain storage is full and the desired work is desired. There is no problem such as being unable to store in the storage, and the leveling of the input work can be further realized.

Next, according to the ratio differential rule of the second structure, the differential value of the ratio in the storage and the set threshold value are taken into consideration, and the work having a high ratio and a rising tendency is preferentially input, and the reverse operation is performed. Since the work with a low ratio and a downward trend are prioritized and restrained, fluctuations in the in-storage ratio can be predicted. For example, if the current in-storage ratio is high but there is a decreasing trend, the ratio priority rule above Then, it is possible to solve the problem that the ratio will decrease by giving priority to the investment, and conversely, the problem that the ratio will increase when the ratio is low but is increasing.

Next, according to the ratio integration rule of the third configuration, control is performed by comparing the integrated value of the ratio in the storage in a certain set range time with the ratio integrated value calculated from the predetermined production ratio. Can predict fluctuations in storage,
Even if the ratio fluctuates with time, the fluctuation can be absorbed to some extent.

[0019]

Embodiments of the present invention will be described with reference to the drawings.

First, an example of a line configuration applied to the work inputting device of the present invention will be described. In the present embodiment, description will be given by taking as an example the rearrangement of the transport order between the coating line and the assembly line.

As shown in FIG. 3, the vehicle work 2 conveyed by the conveyor 20 from the coating line which is the previous process.
In order to change the transfer order of No. 2 and the transfer order of the vehicle work 22 supplied to the assembly line which is a post-process by the conveyor 24, the vehicle work is temporarily stored in groups between the conveyors 20 and 24. A plurality of storages 26 are provided. In the storage 26,
First-in first-out type three line type storage 26a,
26b and 26c are arranged in parallel. And
The vehicle work 22 conveyed by the conveyor 20 from the coating line corresponds to the corresponding storage 26a, 26b, 2
Conveyor 20 and storage 26 for storage in 6c
The sorting conveyor 28 is provided between the a, 26b, and 26c.
Are orthogonally arranged. The vehicle work 22 carried by the conveyor 20 is once transferred to the sorting conveyor 28 and carried to the corresponding entrance of the storage 26. Then, when the vehicle work 22 reaches the entrance of the corresponding storage 26, the sorting conveyor 28 is stopped, and the vehicle work 22 is stored in the storage 26. In this way, the vehicle work 22 stored in the storage 26 is moved forward and is arranged in a column in a predetermined space with respect to the vehicle work 22 already stored.

Further, in order to put the vehicle work 22 stored in the storage 26 toward the conveyor 24 of the assembly line, between the outlet side of each of the storages 26a, 26b and 26c and the conveyor 24, the supply is provided. The conveyors 30 are arranged orthogonally. The vehicle work 22 satisfying a predetermined condition among the vehicle works 22 stored in each storage 26.
Is temporarily transferred from the outlet of the storage 26 to the supply conveyor 30, and is conveyed to the front position of the conveyor 24. In this state, the conveyor 30 is temporarily stopped and the vehicle work 22 is transferred onto the conveyor 24.

In this manner, the vehicle work pieces 22 stored in the storage 26 are sequentially selected and loaded into the conveyor 24, so that the vehicle work pieces 22 are directed toward the assembly line.
Can be serially conveyed in a desired order. In addition,
In the above, the storage 26 has three storages 2.
Although the case of having 6a, 26b, and 26c has been described, the present invention is not limited to this, and may be four or more.

Which of the vehicle workpieces stored in the storage 26 is to be loaded into the assembly line is determined by the workpiece loading instruction apparatus A according to the embodiment of the present invention described below.

As shown in FIG. 2, the work input instruction device A includes an environmental condition searching unit 11 as an environmental condition searching means, a computing unit 12, an upper rule storage unit 15, and an instruction rule storage unit 1.
9 and 9. Here, the calculation unit 12 has a determination unit 13 as an instruction rule determination unit and a work input instruction unit 17.

Here, the environmental condition detecting section 11 is shown in FIG.
As shown in (1), environmental condition information such as the reserved vehicle information and the vehicle alignment information is sent to the calculation unit 12. Here, the reserved vehicle information is
It is information about the vehicle number of the holding vehicle work that should be put on hold due to lack of assembly parts, and the vehicle alignment information indicates the vehicle type and specifications of the vehicle work as shown in FIG. Information, passing limit switch (LS) indicating that certain vehicle work has been taken out of storage
It includes information about signals and information about the vehicle number of the vehicle work carried out from the storage.

Next, the instruction rule storage unit 19 stores a plurality of instruction rules applied to search for a work to be input. The upper rule storage unit 15 also stores an upper rule in which a predetermined environmental condition is associated with a plurality of instruction rules.

As shown in FIG. 2, the upper rules can be roughly classified into "input waiting upper rule" and "instruction rule application order upper rule", and as shown in FIG.
The rule is composed of a condition part and an execution part in the form of "HEN ~" arranged in numerical order, and the condition part indicates a predetermined environmental condition.

The above-mentioned "high order for waiting for loading" is a rule that defines the case of waiting for loading on the assembly line. For example, the "IF quantity (colored line) for rule No. 1 (rule name" * waiting for loading ") in FIG. )> 100 THE
The upper rule for "N wait (5 minutes)" corresponds to the "upper wait upper rule", and if the number of colored machines, that is, the number of machines up to the actual assembly process on the assembly line is 100 or more, the lifting is 5 The rule is "wait for a minute."

Also, "instruction rule application order upper order rule"
Defines the order of application of various instruction rules that are applied to detect the input work. In FIG. 4, “IF ratio (specification a)> production ratio” of rule No. 2 (rule name “* ratio over”) When the upper rule of +10 THEN rule application (constraint, hold, ratio priority, top priority) corresponds to the “instruction rule application order upper rule” and the “ratio in the storage of the specification a is larger than the predetermined production ratio + 10%” The order of application of the instruction rule is “constraint rule → holding rule → ratio priority rule → top rule”. The rule No. 3 (rule name “* ratio normal”) in FIG. "When the ratio in the storage of the specification a is less than or equal to the predetermined production ratio + 10%, the instruction rule application order is the constraint rule → holding rule → set ratio rule → first Is a rule stating that the rule ". This higher-level rule, added to any, changes are possible.

Here, as shown in FIG. 2, the plurality of instruction rules stored in the instruction rule storage unit 19 are roughly divided into "A. suppression rule group" and "B. priority rule group", and the above " The "suppression rule group" includes a restriction rule, a reserved vehicle suppression rule, and the like, and the "priority rule group" is classified into "(1) ratio control system".
Ratio priority rule, set ratio rule, ratio differentiation rule, ratio integration rule, distribution variation control rule classified into “(2) variation control system”, and top priority rule classified into “(3) other” , Long-term staying vehicle priority rule, set lane priority rule, full lane priority rule, etc. Details of the various instruction rules will be described later.

Next, when the computing unit 12 receives the environmental state information from the environmental state detecting unit 11, the determining unit 13 in the computing unit 12 stores the information in the upper rule storage unit 15 based on the environmental state information from the environmental state detecting unit 11. The stored upper-level rules are sequentially searched, and information about the execution contents of the executable upper-level rules, for example, information about waiting for input or the application order of the instruction rules is sent to the work input instruction unit 17.

Next, the work input instruction section 17 is connected to the determination section 1
3 receives the information on the execution content sent from the device 3, and gives an instruction for the execution content. In other words, when executing the input wait upper rule, the execution contents, for example, waiting for suspension for 5 minutes are instructed, and when the instruction rule application order upper rule is executed, the instruction rules are stored in order. The instruction is read out from the unit 19 and the instruction rule is applied to select and determine the input work, and the instruction to input the selected vehicle work is output.

The processing operation of the arithmetic unit 12 will be described with reference to a flowchart. As shown in FIG. 5, when the input vehicle work is determined from the vehicle works in the storage, the determining unit 13 of the arithmetic unit 12 is Fetch rules, that is, sequentially fetch upper rules from the upper rule storage unit 15 and apply the upper rules to determine the execution content. In other words, the order of waiting for input or the application order of the instruction rules to be applied is determined (step 0).
01). Next, the work input instruction unit 17 sequentially applies the instruction rules according to the order of application of the instruction rules from the determination unit 13, and selects the vehicle work to be input (step 002). Then, when the vehicle work to be inserted is determined, a closing instruction is output (steps 003, 00).
4) If the number of vehicle works to be input cannot be determined to be one, the process returns to step 1 to search for another upper rule.

Here, the processing operation of the judging section 13 will be described in more detail. As shown in FIG. 6, the upper rule is fetched from the upper rule storage section 15. That is, the upper rule is taken out (step 011). Next, the matching of the upper rule, that is, the condition part of the upper rule and the current environment information are compared (step 012),
In the case of matching, the operation is performed according to the execution part of the upper rule (steps 013 and 015). That is, for example, information about the instruction rule application order is sent to the work input instruction unit 17. Further, in step 012, if the comparison is not performed, it is determined whether or not there is another upper rule (step 014). If there is, the process returns to step 011. If not, error processing is performed (step 01).
6) Finish.

Next, the processing operation of the work input instruction section 17 will be described in more detail. As shown in FIG. 7, when the instruction rules are applied according to the order of application of the instruction rules in the determination section 13, an instruction is given. Fetch rules, that is, read instruction rules from the instruction rule storage unit 19 according to the application order (step 021),
Processing is performed according to the read instruction rule (step 022). For example, in the case of rule No. 2 (rule name “* ratio over”) in FIG. 4, the instruction rule is applied in the order of constraint rule → holding rule → ratio priority rule → top priority rule. In these applications, when there are two or more vehicle works as the input work candidates, it is searched whether or not there is another instruction rule (step 024),
If there is, the process returns to step 021 to apply the next instruction rule. If there is no other instruction rule in step 024, error processing is performed (step 025) and the process ends.

In the present invention, an upper rule is provided,
The application order can be changed according to each condition such as the ratio of the specifications of the vehicle work in the storage, and the application order of the instruction rules can be freely changed by adding or changing the upper rule, and the application order of the instruction rules can be changed. Since it is not fixed, there is no shortage of candidate work in the storage, there is no problem that a certain storage is full and the vehicle work cannot be stored in the desired storage, and the input work can be leveled. it can.

Next, the instruction rule storage unit 19 in FIG.
Each instruction rule stored in will be described.

Constraint Rule First, the "constraint rule" classified into the suppression rule group includes the work conditions (conditions required for the work itself such as vehicle type, specifications (whether or not there is a sunroof, presence or absence of an air conditioner, etc.)). It is a rule that is determined by the input conditions (conditions for transporting the vehicle work with the same work conditions such as the interval specification and the number of continuous work),
For example, there are rules such as "the vehicle A must be spaced apart from each other by two units" and "up to three units of vehicle work having the specification a can be continuously introduced".

Suspended Vehicle Suppression Rule Further , the "suspended vehicle suppression rule" is a rule for removing a vehicle work to be suspended from being a candidate for an injecting vehicle work due to a situation such as lack of assembled parts. The information about the reserved vehicle is obtained from the environmental state detection unit 11 as shown in FIG.

Ratio Priority Rule Next, the "ratio priority rule" classified into the ratio control system of the priority rule group will be described. In this rule, the vehicle work stored in the storage and the vehicle work suspended on the next process line are classified into item A as shown in FIG.
Classify from D to D, and calculate the ratio of the in-storage and a predetermined number of suspended vehicle works in each item.
Here, items A to D are determined by the vehicle type, specifications such as 4WD, and the vehicle work in the storage corresponds to any of the items. Then, for each item, the priority defined by (ratio in storage)-(suspended ratio) / (suspended ratio) is calculated, and the vehicle work of the item with the highest priority among them is regarded as the input vehicle work. select. That is, in the case of FIG. 8, the item C with the highest priority is given.
The vehicle work of is selected as the input work.

Set Ratio Rule Next, the "set ratio rule" will be described. In this rule, the set ratio is determined in advance for each work constraint condition based on the vehicle type and specifications, and the input vehicle work is selected so as to be closer to this set ratio. This set ratio is set based on the production target, and is usually treated as a synonym for the production ratio described later.
Specifically, the difference between the actual result ratio and the set ratio in the case where each of the extracted input candidate vehicle works is input is obtained, and the candidate vehicle work having the smallest square of the difference is selected as the input vehicle work. That is, based on the formula of evaluation function Z (i) = Σ {(achievement ratio of vehicle or specification)-(set ratio of vehicle or specification)} ² , select the vehicle work whose evaluation value Z (i) is the smallest. To do.

More specifically, as shown in FIG. 9, the set ratios of the vehicle type A, vehicle type B, specification a, specification b, and specification c are 30%, 70%, 20%, 30 respectively.
% And 15%. This setting ratio is mainly set based on the production target. Here, FIG.
As shown in 0, it is assumed that nine vehicle works of the type shown in the drawing have been introduced from the front of the assembly line to the front. In other words, vehicle type A2, vehicle type B7, specification a2
It has a configuration of a stand, a specification b2, and a specification c2. Also,
Various vehicle works are arranged in the three line-type storages 16a, 16b, 16c, but the vehicle work extracted as the input candidate vehicle work is the exit side of each line-type storage 16a, 16b, 16c. From the first to the second unit, a total of six vehicle works of the type shown in FIG. 10 are arranged. Here, it is assumed that, out of the six vehicle works described above, for example, vehicle works satisfying i = 2, 5, and 6 are extracted as the vehicle works satisfying the constraint rule, as shown in FIG. 9. The Z (i) is calculated for the vehicle work of i = 2, 5, and 6.

Here, for example, a vehicle work of i = 5 will be described. The vehicle work of i = 5 is a vehicle work of which vehicle type is B and has a specification c, as shown in FIG. When is put into the assembly line, the vehicle type B is increased by 1 to 8 and the specification c is increased by 1 to 3. Then, the performance ratios for the vehicle type A, vehicle type B, specification a, specification b, and specification c are 20%, 80%, 20%, 20%, and 30%, respectively, as shown in FIG. The square of the difference is calculated as (20-30) ² + (80
-70) ² + (20-20) ² + (20-30) ² +
(30-15) ² = 525.

As described above, the above Z (i) is calculated for the vehicle works of i = 2, 5, and 6. In the cases shown in FIGS. 9 and 10, Z (i) for vehicle works with i = 2, 5, and 6 is 125, 525, and 25, respectively, and is smallest when i = 6. That is, i = 6
When the vehicle work of is put in, it becomes the closest to the set ratio.
Therefore, the vehicle work of i = 6 is determined as the vehicle work to be put into the assembly line. In addition, in the present embodiment, for ease of explanation, the nine vehicle works in the assembly line from the front are explained, but in actuality, 100 works.
It is of the order of a unit, and its value may be set arbitrarily.

According to this rule, the vehicle work is input so as to approach the set ratio, so that when the production target is changed, the input vehicle work can be positively approached to the production target. Further, for example, if the set ratio is set to 25% for a certain vehicle type, the vehicle type is tried to be introduced at a pace of one in four vehicles, so that it is possible to guarantee the leveling of the level of the introduced vehicle.

Ratio Differential Rule Next, the "ratio differential rule" will be described. In each of the above rules, each rule is applied according to the situation in the storage or the assembly line at a certain judgment, while in this rule, the work constraints such as the vehicle type or specifications in the storage are time-series. In order to select the input vehicle work by observing such changes, the ratio in the storage of the work constraint condition such as a certain vehicle type or specification is detected in time series, and the ratio is equal to or higher than the upper limit setting threshold, and If the differential value of the ratio at the time of judgment is positive, the priority is given, and if the ratio is less than or equal to the lower limit setting threshold and the differential value of the ratio at the time of judgment is negative. Is to give priority to restraining the input. That is, if the ratio changes as shown in FIG. 11 for a certain specification, priority input is performed in the section indicated by a and priority is suppressed in the section indicated by b.

A specific application example of this ratio differentiation rule will be described. As shown in FIG. 12, a case where one vehicle work is selected from the three vehicle works located at the head of the three storages will be described. For the specification c, the ratio changes as shown in FIG. 13, and the differential value is 5 at time t1.
This rule is not applicable because it is within the threshold range of 25% to 25%. As for the specification a, as shown in FIG. 14, at time t1, the ratio exceeds the upper limit threshold value and the differential value is positive. Therefore, this rule is applied, and the vehicle work having the specification a is applied. Prioritize throwing. In this example, for the specification c, the production ratio (the ratio of vehicle work that satisfies a certain work constraint condition in the produced vehicle work, the same applies hereinafter) is set to 15%, and the threshold value is set to an upper limit of 10%. For the specification a, the production ratio is set to 20% and the threshold value is set to the upper limit of 10%.

In this ratio differentiation rule, when the ratio in the storage of a certain vehicle type or specification is equal to or higher than the upper limit set threshold value, and the differential value of the ratio at the time of judgment is positive, the ratio becomes the threshold value. Since it is in the process of rising even though it has exceeded, it is further given priority in order to suppress the increase in the ratio, and conversely, the ratio is below the lower limit setting threshold and the ratio at the time of judgment When the differential value is negative, the ratio is smaller than the threshold position but is in the decreasing process. Therefore, in order to prevent the ratio from becoming smaller, the injection is preferentially suppressed. As a result, when the ratio in the storage is high at present but it is decreasing, the above ratio priority rule can solve the problem that the ratio is lowered by giving priority to it, and vice versa. It can also solve the problem that the ratio goes up when it is low but is on the rise.

Ratio Integration Rule Next, the "ratio integration rule" will be described. This rule also considers changes in the ratio over time, similar to the ratio differentiation rule above.
In the set range time T, the ratio integral value (hereinafter referred to as the production ratio integral value) S _R obtained from the production ratio under the work constraint condition such as a certain vehicle type or specification and the integral value of the ratio in the storage in the assembly line (the ratio integral in the storage) Value) S
_{When r} is compared with _r, and if the storage ratio integral value S _r > the production ratio integral value S _R , the vehicle work satisfying the work constraint condition is preferentially input. That is, FIG.
5, for example, when the ratio of the storage of the vehicle work having a certain specification i in the storage is shown by the curve r (t), the production ratio is set by R, and the current time is t ₁ and the setting range time is T, The in-storage ratio integral value S _r is calculated by the following formula.

[0051]

[Formula 1] Further, since the production ratio integral value S _R is calculated by S _R = R · T, these calculated in-storage ratio integral values S _r are calculated.
And the production ratio integral value S _R are compared, and when S _r > S _R , the vehicle work of the specification i is preferentially introduced.

As a specific application example of this ratio integration rule, when the ratio of a specification a in the storage changes as shown in FIG. 16, the value of the set production ratio R is set to 1
0, and at the time of t = 14, the ratio integration value S _r in the storage in the set range time of T = 12 is calculated by the following formula.

[0053]

[Formula 2] Further, the production ratio integral value S _R is S _R = R · T = 10 × 1
Since 2 = 120, the ratio integration value S _{r in} storage>
When it becomes 120, the vehicle work of the specification a is preferentially input.

According to this ratio integration rule, for example, the ratio in the storage is high at present, but the ratio in the storage is small a few hours ago, and it is not applied so much in a time series. By preferentially inputting only the current ratio, it is possible to solve the problem that the work to be input does not exist by applying the set ratio and continuing to input when the ratio in the storage decreases eventually. . That is, since the integrated value of the ratio in time series is taken into consideration, the fluctuation can be absorbed to some extent even if the ratio fluctuates with time.

Distribution Variation Control Rule Next, the “distribution variation control rule” will be described. This rule
The vehicle work that is closest to the ideal number of vehicles is selected from the candidate vehicle work, and the variation for each work constraint condition such as the specification when the candidate vehicle work is input is calculated for each candidate vehicle work. After weighting each work constraint condition, the total sum is calculated, and the candidate vehicle work whose calculated total sum is the smallest is selected as the input vehicle work.

A specific application example of this distribution variation control rule will be described. As shown in FIG. 17, line type storages 26a, 26b, 26c and 26d, a supply conveyor 30 and a conveyor 24 are provided, and each of the above respective The vehicle work to be loaded into the conveyor 24 is selected from the vehicle works located at the head of the storages 26a to 26d.
As shown in FIG. 7, the storages 26a to 26d store vehicle works 31a to 31d of specification unspecified, specification b, specification a, and specification a and specification b, respectively. Also,
Vehicle work without specification, vehicle work with specification a, and vehicle work with specification b have already been loaded into the conveyor 24 of the assembly line in order from immediately before.

In the distribution variation control rule, the ideal interval number of vehicles is determined from the production ratio for each specification. here,
If the production ratio of the specification a is 33% as shown in FIG. 18, it is sufficient to produce the vehicle of the specification a at a ratio of one to three. Therefore, the number of units with the ideal interval of the specification a is two. Similarly, since the production rate of the specification b is 25%, the number of units with the ideal interval is three.

Next, the candidate vehicle works 31a, 31 to be introduced.
The variation is calculated for each specification of b, 31c, and 31d.
The variation x _ji of the distribution regarding the i-th specification of the j-th candidate vehicle work for input can be obtained by the following equation.

X _ji = {(0-b _j ) ² * c _j0 + ... +
(K−b _j ) ² * c _jk + ...} / {(c _j0 + ... +
c _jk + ...)-1} Here, k is the number of vehicles in the interval, b _j is the number of vehicles in the ideal interval, and c _jk is the number of vehicle works put in each number of intervals.

Specifically, it is calculated as follows.
FIG. 19 is a graph showing the distribution of the number of vehicle workpieces, which have already been put into the assembly line, for each specification, and in FIG. 19A, the specification a is defined as the i = 1st specification.
FIG. 19B shows the distribution regarding the specification b as the i = second specification.

Here, when a vehicle work 31a for which specifications are not specified is input with j = 1, the variation x ₁₁ in the distribution relating to the specifications a is the ideal number b ₁ = 2, so x ₁₁ = {(1- 2) ² x 2+ (2-2) ² x 8+ (3-
2) ² x 6+ (4-2) ² x 3+ (5-2) ² x 4} /
{(2 + 8 + 6 + 3 + 4) -1} = 2.55. Also, the variation x ₁₂ of the distribution regarding the specification b is
Since the ideal number b ₂ = 3, x ₁₂ = {(1-3) ² × 1 + (2-3) ² × 3 + (3-
3) ² x 4+ (4-3) 2 x 2+ (6-3) ² x 1+
(7-3) ² × 2} / {(1 + 3 + 4 + 2 + 1 + 2)-
1} = 4.17.

Next, the sum of the distribution variations is calculated by weighting the distribution variations of the specifications with respect to how much the disturbance of the specifications is emphasized. That is, when there are M specifications to be leveled and there are N candidate vehicle works in the storage 26, the storage 2
Sum of distribution variations Ej when the j-th candidate vehicle work to be put in 6 is put into the assembly line Is evaluated by the following formula.

E _j = w ₁ x _ji + w ₂ x _j2 + ... + w _i
x _ji + ... + w _M x _jM Here, w _i is a weighting coefficient for how much the disturbance regarding the i-th specification is emphasized, and x _ji is a value representing the variation in the distribution. In this embodiment, M = 2 and N = 4.

Therefore, w ₁ = w ₂ = 1 in this embodiment.
Then, the total sum E ₁ of the variations when the vehicle work 31a is input is E ₁ = x ₁₁ + x ₁₂ = 2.55 + 4.17 = 6.72.

Next, when the vehicle work 31b of the specification b is input with j = 2nd, the distribution variation x ₂₁ related to the specification a is 2.55, which is the same as x ₁₁ . With regard to the specification b, when the vehicle work 31b is input, the vehicle work of the specification b already exists on the assembly line, and therefore the interval number is 2. Therefore, the shaded portion shown in FIG. 19B is added to obtain c ₂₂ = 4, and the distribution variation x ₂₂ related to the specification b is x ₂₂ = {(1-3) ² × 1 + (2-3) ² × 4 + (3-
3) ² x 4+ (4-3) ² x 2+ (6-3) ² x 1+
(7-3) ² × 2} / {(1 + 4 + 4 + 2 + 1 + 2)-
1} = 3.92.

Therefore, when w ₁ = w ₂ = 1 is set, the total sum E ₂ of the variations when the vehicle work 31b is input is E ₂ = x ₂₁ + x ₂₂ = 2.55 + 3.92 = 6.47.

As described above, the total sum of the variations for each candidate vehicle work is obtained, and the vehicle work having the smallest total sum of the variations is selected as the input work.

As described above, according to the distribution variation control rule, the input vehicle work can be selected so as to be closer to the ideal number of vehicles, and a specific vehicle work is not biasedly input.

Leading Priority Rule Next, the "leading priority rule" is to give priority to the leading vehicle work when a plurality of vehicle works in the leading and second columns are selected as loading vehicle works. is there. This is because when the vehicle work of the second row is put in, it is troublesome to temporarily evacuate the leading vehicle work to the evacuation lane.

Long-Term Stay Vehicle Priority Rule Next, the “long-term stay vehicle priority rule” is that, when a plurality of vehicle works with a staying time in the storage are selected as input vehicle works,
The priority is to select the vehicle work with a long residence time.

Set lane priority rule, full lane priority rule
Lumpur Then, "Setting lanes Priority Rules" is intending to be preferentially turned for a predetermined storage, also "full car lane priority rule" is in storage and classified by vehicle type or specification as possible It is to give priority to the storage that has become full, such as storing in.

The application order of each instruction rule as described above is freely determined by the upper-level rule, and an example of the upper-level rule capable of optimally leveling the work of the input vehicle is shown in FIG. .

That is, first, the rule No. In the upper rule of 1, when the number of colored vehicles is 100 or more and the number of candidate vehicle workpieces is less than 14, it is assumed to wait for lifting. This is because there is a margin in the number of assembled vehicles, so that it is possible to wait for the number of candidate vehicle workpieces to increase and to insert the optimal vehicle workpieces.

Next, the rule No. No. 2 upper rule and rule No. 2 In the upper rule of 4, specification a and specification b
If the ratio in the storage is outside the predetermined range, that is, if it exceeds the production ratio + 10% or falls below the production ratio -10%, the constraint rule → the hold vehicle restraint rule → the ratio differentiation rule → the ratio priority rule → the head priority rule → The instruction rules are applied in the order of the long-term staying vehicle priority rule, while the rule No. In the upper rule of No. 3, the ratio of the specifications a and b in the storage is within a predetermined range, that is, the production ratio ± 1.
If it is within the range of 0%, the instruction rules are applied in the order of constraint rule → holding vehicle suppression rule → ratio integration rule → set ratio rule → top priority rule → long-term stay vehicle priority rule.

Here, when the ratio in the storage is out of the predetermined range, the ratio differentiation rule is applied on the assumption that the ratio differentiation rule is in the case where the ratio in the storage is out of the predetermined range as described above. In addition, the ratio priority rule is applied because the set ratio rule does not consider the situation in the storage, so if you continue to apply the set ratio rule when it is outside the predetermined range, the vehicle work that can be thrown in will be. This is because there is a problem that it will not exist. on the other hand,
The ratio integration rule and the distribution variation control rule are applied when the ratio in the storage is within a predetermined range, because the ratio integration rule and the distribution variation control rule are applied based on the production ratio as described above. Since it is possible to level the input work that is close to the production ratio, it is appropriate to apply it when it is within the predetermined range, and the set ratio rule is applied to the ratio in the storage. If is within the specified range, set ratio (production ratio)
This is because there is little risk that the input work will not exist even if control is performed to bring it closer to.

In the above embodiment, the vehicle work is described as an example of the work, but the work is not limited to this and may be any work.

[0077]

According to the work inputting device according to the present invention, a higher order rule can be provided and the application order can be changed according to a predetermined environmental condition, and a higher order rule can be added.
By changing the order, the application order of the instruction rules can be freely changed, and the application order of the instruction rules is not fixed, so that the leveling of the input work can be further realized.

When the instruction rule is the ratio differentiation rule, the work having a high ratio and a rising tendency is preferentially introduced in consideration of the set threshold value and the differential value of the ratio in the storage, and conversely the ratio is set. Since the work that is low and has a decreasing tendency is given priority to suppress the input, it is possible to predict the fluctuation of the ratio in the storage.

Further, even when the instruction rule is the ratio integration rule, the fluctuation in the storage can be predicted, and the fluctuation can be absorbed to some extent even if the ratio temporally changes.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a complaint of a work input instruction device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a work input instruction device according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a line configuration according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an example of an upper rule.

FIG. 5 is a flowchart showing a processing operation in an arithmetic unit.

FIG. 6 is a flowchart showing a processing operation in a determination unit.

FIG. 7 is a flowchart showing a processing operation in a work input instruction unit.

FIG. 8 is an explanatory diagram illustrating an application example of a ratio priority rule.

FIG. 9 is an explanatory diagram showing an example of calculating an evaluation value in a set ratio rule.

FIG. 10 is an explanatory diagram illustrating an application example of a set ratio rule.

FIG. 11 is an explanatory diagram illustrating the principle of a ratio differentiation rule.

FIG. 12 is an explanatory diagram illustrating an application example of a ratio differentiation rule.

FIG. 13 is an explanatory diagram illustrating an application example of a ratio differentiation rule.

FIG. 14 is an explanatory diagram illustrating an application example of a ratio differentiation rule.

FIG. 15 is an explanatory diagram illustrating the principle of a ratio integration rule.

FIG. 16 is an explanatory diagram illustrating an application example of a ratio integration rule.

FIG. 17 is an explanatory diagram illustrating an application example of a distribution variation control rule.

FIG. 18 is an explanatory diagram illustrating an application example of a distribution variation control rule.

FIG. 19 is an explanatory diagram illustrating an application example of a distribution variation control rule.

FIG. 20 is an explanatory diagram showing a suitable upper rule.

[Explanation of symbols]

 1 Environmental State Detection Means 3 Instruction Rule Determining Section 5 Upper Rule Storage Section 7 Work Input Instruction Section 9 Instruction Rule Storage Section

Claims (3)

[Claims] 1. A work inputting device for inputting an optimum work from a plurality of works stored in a plurality of storages for temporarily storing works conveyed from a predetermined production line to an assembly line to a assembly line. In, an environmental condition detecting means for detecting an environmental condition including types and specifications of works in a storage and an assembling process, and an instruction rule storage unit for storing a plurality of instruction rules applied to select a work to be input. A higher-level rule storage unit that stores a higher-level rule that associates a predetermined environmental condition with the instruction rule, an upper-level rule stored in the higher-level rule storage unit, and the higher-level rule storage unit that stores the higher-level rule storage unit. The instruction rule determination unit that determines the instruction rule to be applied by and the instruction rule determined by the instruction rule determination unit Read from indicates rule storage unit, the work on instruction apparatus characterized by having a workpiece on instruction unit that performs work on instruction in accordance with the instruction rule. 2. For each work constraint condition including a work type and specifications defined for input work selection, the ratio in the storage is equal to or higher than the upper limit setting threshold, and the differential value of the ratio is set. Is positive, the work satisfying the work constraint condition is preferentially put into the assembly line, the ratio in the storage is less than or equal to the lower limit setting threshold, and the differential value of the ratio is negative. In this case, the work input instruction device according to claim 1, wherein the work input instruction device is a ratio differential rule that gives priority to a work satisfying the work constraint condition and suppresses the input. 3. The instruction rule calculates, for each work constraint condition including the type of work and specification specified for selecting the input work, from the integral value of the ratio in the storage in a certain set range time and the predetermined production ratio. When the integrated value of the ratio in the storage exceeds the ratio integrated value calculated from the specified production ratio, the work that satisfies the work constraint condition is given priority and selected as the input work. The work input instruction device according to claim 1, wherein the work input instruction device is an integration rule.