CN117747514A - Crown block carrying method, crown block carrying system and crown block carrying medium - Google Patents
Crown block carrying method, crown block carrying system and crown block carrying medium Download PDFInfo
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- CN117747514A CN117747514A CN202410033143.6A CN202410033143A CN117747514A CN 117747514 A CN117747514 A CN 117747514A CN 202410033143 A CN202410033143 A CN 202410033143A CN 117747514 A CN117747514 A CN 117747514A
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Abstract
The invention relates to the technical field of crown block carrying, and discloses a crown block carrying method, a crown block carrying system and a crown block carrying medium, wherein the crown block carrying method comprises the following steps: the first crane obtains a conveying instruction and executes a task of conveying the first wafer box to target equipment; judging whether a second wafer box exists on target equipment when the first wafer box reaches the target equipment in the process of carrying the first wafer box to the target equipment by the first crane, and carrying out combined carrying if the second wafer box exists on the target equipment; otherwise, the first crown block places the first wafer box on the target equipment; the combined carrying process is as follows: and carrying the first wafer box to a first temporary storage position, carrying the second wafer box from the target equipment to a second temporary storage position, carrying the first wafer box at the first temporary storage position to the target equipment, carrying the second wafer box at the second temporary storage position away, wherein the first temporary storage position and the second temporary storage position are positioned around the travelling rail of the overhead crane. According to the invention, the waiting time can be reduced, loading and unloading can be completed by only using one crown block, and the crown block carrying efficiency is improved.
Description
Technical Field
The invention relates to the technical field of crown block carrying, in particular to a crown block carrying method, a crown block carrying system and a crown block carrying medium.
Background
In the production and manufacturing process of products such as semiconductor chips, a crown block (Overhead Hoist Transport, OHT) transfer system is generally used to transfer cargoes. The overhead travelling crane in the overhead travelling crane conveying system can run on an overhead track and can directly enter a loading and unloading port of a storage device or a process device through a belt transmission lifting mechanism, can be applied to internal transportation in a process area, transportation in a process area or transportation in a factory, and is an important automatic conveying system in a semiconductor manufacturing factory.
The products are stored in standardized product transfer boxes during the production process, and the front opening wafer transfer boxes (Front Opening Unified Pod, FOUP) are common; the FOUP can be placed at the bearing position corresponding to the machine during processing, and is directly placed at the temporary storage position of the aerial track side or the bearing position of the next machine after the processing is finished, and all the carrying processes in the process are realized through the crown block. The material control system (Material Control System, MCS) is responsible for the transportation path assignment and management of storage facilities and overall management of manufacturing plant material. Because the crown block can only carry one FOUP at a time, the product replacement after the machine is finished is completed by carrying twice: when the machine is processed, the material control system firstly sends a carrying task after receiving a carrying instruction, so that a crown block is carried away from the original FOUP on the machine to realize unloading; after the carrying-out is completed, the carrying position of the machine table enters an idle state, and after the processing task is determined, the material control system sends a carrying task to carry the selected next processed product to realize loading, and the two carrying tasks realize the replacement of the product. In the task execution mode, the machine has waiting time, so that the machine is idle, the carrying time and the carrying cost are increased, the overall production cost is increased, and the efficiency is reduced.
How to reduce the waiting time of the machine caused by the secondary transportation is an important issue for improving the production efficiency of the semiconductor manufacturing factory. In order to solve this problem, in the prior art, waiting time is reduced by dispatching in advance, and a main mode is to predict the processing end time of a machine in advance, then obtain the next batch of processed products through a production scheduling system, and move a task to a position near the machine in advance. When the machine is finished, the material control system enables one crown block to take goods, and then the next carrying-in task near the machine is directly loaded, so that the carrying time is shortened, and the waiting of the machine is reduced.
However, the method of dispatching in advance in the prior art has the following two problems: on the one hand, the number of handling is not reduced or even slightly increased. Because the work is dispatched in advance, the replacement of different products on the same machine can not be completed by one trolley, and therefore, the work can be completed by at least carrying the work twice. If the predicted time is inaccurate, the FOUP is put at a temporary storage position near the machine in advance by dispatch, and then the FOUP is carried for the third time to realize the product switching processing of the machine. From the perspective of handling, the load of the logistics handling system is increased instead. On the other hand, the shortened time is limited. Because the current proposal can only reduce the waiting time in the second transportation, the picking time of the vehicle is not considered, and the time cannot be compressed from multiple aspects.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects in the prior art, and provide the crown block carrying method, the crown block carrying system and the crown block carrying medium, so that the waiting time can be reduced, the loading and unloading can be completed by only using one crown block, and the crown block carrying efficiency is improved.
In order to solve the technical problems, the invention provides a crown block carrying method, which comprises the following steps:
the first crane obtains a conveying instruction and executes a task of conveying the first wafer box to target equipment;
judging whether a second wafer box exists on target equipment when the first wafer box reaches the target equipment or not in the process of carrying the first wafer box to the target equipment by the first crane, and carrying out combined carrying if the second wafer box exists on the target equipment; otherwise, the first crown block places the first wafer cassette on target equipment;
the combined carrying process comprises the following steps:
s10: carrying the first wafer cassette to a first temporary storage position;
s20: transporting a second wafer cassette from the target apparatus to a second temporary location;
s30: carrying the first wafer cassette at the first temporary location onto a target device;
s40: removing the second wafer cassette at the second temporary storage location;
the first temporary storage position and the second temporary storage position are located around the travelling rail of the crown block.
In one embodiment of the present invention, the second wafer cassette is processed during the first cart handling the first wafer cassette to the target device, and the second cart is moved to the target device to handle the second wafer cassette.
In one embodiment of the present invention, when the first wafer cassette arrives at the target device and the second wafer cassette is located on the target device, the second crown block removes the task of transporting the second wafer cassette.
In one embodiment of the present invention, when the first wafer cassette arrives at the target device, if the second wafer cassette on the target device has completed processing, the first cart executes the S10-S40; and if the second wafer box is not finished, the first crown block conveys the first wafer box to the first temporary storage position and leaves the first temporary storage position, and after the second wafer box is finished, the third crown block executes S20-S40.
In one embodiment of the present invention, the process of obtaining the handling instruction by the first cart is: obtaining the time after processing according to the residual processing time of the second wafer box in the target equipment; on the basis of the processing completion time, a conveying instruction is sent to the first crown block 120s-240s in advance, and the first crown block is conveyed to the position where the first wafer box is located.
The invention also provides a crown block carrying system, which comprises:
the overhead travelling crane comprises an overhead travelling crane running rail and a plurality of overhead travelling cranes, wherein a first temporary storage position and a second temporary storage position are arranged around the overhead travelling crane running rail;
the material control system is used for controlling the crown block to operate and commanding the first crown block to carry the first wafer box to target equipment; in the process of carrying the first wafer box to target equipment by the first crane, the material control system judges whether a second wafer box exists on the target equipment when the first wafer box reaches the target equipment, and if so, a combined carrying command is sent; otherwise, the first crown block is instructed to place the first wafer cassette on target equipment;
wherein, the process of combination transport does: carrying the first wafer cassette to the first temporary storage position; transporting a second wafer cassette from the target apparatus to the second temporary location; carrying the first wafer cassette at the first temporary location onto a target device; and removing the second wafer cassette at the second temporary storage position.
In one embodiment of the present invention, further comprising: and the production execution system is used for sending a task for carrying the first wafer box to the material carrying system according to the remaining processing time of the second wafer box in the target equipment, the material carrying system is used for sending an instruction for carrying the first wafer box to the first trolley, the first trolley is used for executing the instruction for carrying the first wafer box, and the material carrying system is used for feeding back the execution condition of the task to the production execution system.
In one embodiment of the present invention, the production execution system sends a task of moving away the second wafer to the material handling system according to the information of the processing completion of the second wafer, and the material handling system sends an instruction of moving the second wafer cassette to the second crown block.
In one embodiment of the present invention, when the first crane conveys the first wafer cassette to the target device, the material conveying system obtains that the second crane has not arrived at the second wafer, and sends an instruction that the second crane cancels conveying the second wafer cassette.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the crown block handling method.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the invention, the temporary storage position group is arranged, and the combined transportation is carried out through one crown block on the basis, so that the loading and unloading of the crown block are completed, the waiting time of the crown block is reduced, the loading and unloading of the crown block can be completed by only using one crown block, the transportation efficiency of the crown block is improved, the requirement on the number of crown blocks is reduced, the waiting time caused by production and transportation is reduced to the greatest extent, and the production efficiency is improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
fig. 1 is a flow chart of the method of the present invention.
Fig. 2 is a task scheduling execution diagram of the present invention.
FIG. 3 is a schematic diagram of the combined handling process of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1 and 2, the invention discloses a crown block carrying method, which comprises the following steps:
s1: the overhead travelling crane performs preparation work before carrying, and comprises the steps of presetting temporary storage position groups around an overhead travelling crane running track and setting a combined carrying task flow. The method comprises the following steps:
the temporary storage position group is arranged around the travelling rail of the crown block and comprises a first temporary storage position and a second temporary storage position, the temporary storage position group can also comprise a plurality of other temporary storage positions, two temporary storage positions are preferably arranged in the embodiment, the two temporary storage positions can be arranged on one side or two sides of the travelling rail of the crown block and are preferably arranged on two sides, and the intersection can be avoided and the goods circulation can be guaranteed to the maximum extent. The first temporary storage position and the second temporary storage position only temporarily store the product conveying boxes in the combined conveying process, the first temporary storage position is used for placing the first wafer box, the second temporary storage position is used for placing the second wafer box, and the first wafer box and the second wafer box are front-opening type wafer conveying boxes filled with products with different material numbers. The crown block can access the first wafer box and the second wafer box from the product processing machine table, the first temporary storage position and the second temporary storage position at one position. In this embodiment, the material control system performs overall scheduling, and when the temporary storage position group is set, the first temporary storage position and the second temporary storage position are registered on the material control system.
The combined carrying task performed at the target device is set, as shown in fig. 3, and the combined carrying process is as follows:
s10: carrying the first wafer cassette to a first temporary storage position;
s20: transporting the second wafer cassette from the target apparatus to a second temporary location;
s30: carrying the first wafer cassette at the first temporary storage position to target equipment;
s40: and removing the second wafer cassette at the second temporary storage position.
S2: before the crown block carries out combined carrying, a carrying task instruction is sent in advance, and the crown block acquires the carrying instruction. The method comprises the following steps:
obtaining the processed time according to the residual processing time of a second wafer box on target equipment on a target product processing machine (target equipment for short), wherein the processed time is obtained by a scheduling system through prediction, and the scheduling system sends a conveying instruction to a first crown block 120s-240s in advance on the basis of the processed time; after receiving the transport task instruction, the first crane goes to the position where the first wafer box is located, and moves to the target equipment in advance after loading the first wafer box.
In this embodiment, the processing time is recorded by the manufacturing execution system (Manufacturing Execution System, MES) during processing and production of the target equipment. In this embodiment, it takes 180 seconds to estimate the handling time, and send a handling task instruction to the material control system 180 seconds in advance, and mark the handling task instruction as being dispatched in advance.
S3: and after the crown block acquires the carrying instruction, the crown block is scheduled to run through a scheduling system. The method comprises the following steps:
after receiving the transport task instruction, the material control system judges whether the transport task instruction can be executed, if yes, the material control system replies that the scheduling system can be executed, and the scheduling system controls the first day to go to the target equipment; otherwise, the reply scheduling system can not execute, and the transport task instruction is received again.
S4: in the process that the crown block goes to the target equipment, if the second wafer box on the target equipment finishes processing in advance, controlling other crown blocks to go to the target equipment to execute a combined carrying task; otherwise, S4 does not perform direct execution S5. The method comprises the following steps:
s4-1: and in the process of moving the first wafer box to the target equipment by the first crane, judging whether the second wafer box on the target equipment finishes processing in advance, if so, executing S4-2, otherwise, executing S4-3.
S4-2: if the second wafer box on the target equipment finishes processing, the production execution system sends a task of moving away the second wafer to the material handling system according to the information of the processing completion of the second wafer; the material control system receives the carrying task instruction and then judges whether the carrying task instruction can be executed or not, if yes, the material control system replies that the dispatching system can be executed, sends an instruction for carrying the second wafer box to the second crown block and controls the second crown block to carry the second wafer box to the target equipment; otherwise, the reply scheduling system can not execute, and the transport task instruction is received again.
S4-3: if the second pod on the target device has not finished product processing in advance, S4 does not perform direct execution S5.
S5: when the crown block reaches the target equipment, if the target equipment is provided with the second wafer box, the task of transporting the second wafer box by other crown blocks is canceled; and if the second wafer box on the target equipment is processed, the crown block executes the combined conveying task, otherwise, the crown block conveys the first wafer box to the first temporary storage position and leaves. The method comprises the following steps:
s5-1: when the first trolley conveys the first wafer box to the target equipment, judging whether a second wafer box exists on the target equipment, if the second wafer box exists and the material conveying system acquires that the second trolley does not reach the second wafer, sending an instruction of canceling the second wafer box by the second trolley, and executing S5-2; otherwise, S5-3 is performed.
The second crown block is a crown block which can be used for carrying the second wafer box on the current target equipment in a combined way, and the two crown blocks can be prevented from carrying out the same combined carrying task by increasing the judgment, so that the carrying efficiency is further improved.
S5-2: judging whether the second wafer box on the target equipment is processed or not, and if the second wafer box on the target equipment is processed, executing S10-S40 by the first crane; if the second wafer cassette on the target equipment does not finish processing, S5-3 is executed;
s5-3: the first crown block conveys the first wafer cassette to the first temporary storage position and leaves the first temporary storage position, and S6 is executed.
S6: and waiting for the second wafer box on the target equipment to finish product processing, reestablishing a conveying task instruction and controlling other crown blocks to carry out combined conveying. The method comprises the following steps:
and after the second wafer box on the target equipment finishes the product processing, the production execution system sends a task of moving away the second wafer to the material handling system according to the information of the completion of the second wafer processing. After receiving the carrying task instruction, the material control system judges whether the carrying task instruction can be executed, if yes, the material control system replies that the dispatching system can be executed and sends an instruction for carrying the second wafer box to a third crown block, and the third crown block executes S20-S40; otherwise, the reply scheduling system can not execute, and the transport task instruction is received again.
The third crown block is a crown block which is used for carrying the first wafer box to the first temporary storage position by the first crown block and then carrying out the combined carrying task by the first crown block, and the third crown block is an empty crown block.
S6 and S4 are not concurrent at the same time. And other crown blocks are used for carrying, so that the cargo circulation can be guaranteed to the greatest extent.
S7: at this time, the first wafer cassette after the exchange on the target device returns to S2 to carry out the next round of transport. The method comprises the following steps:
and (2) returning to execute the S2 in the process of waiting for the first wafer box on the target equipment to finish product processing, wherein the first wafer box and the second wafer box are interchanged, reestablishing a conveying task instruction and controlling the fourth crown block, the fifth crown block and the sixth crown block to carry out the next round of conveying.
The fourth crown block, the fifth crown block and the sixth crown block are crown blocks for executing the combined carrying task in the next wheel, the fourth crown block is equivalent to the first crown block in S2-S6, the fifth crown block is equivalent to the second crown block in S2-S6, and the sixth crown block is equivalent to the third crown block in S2-S6.
Example two
The invention also discloses a crown block carrying system, which comprises:
the overhead travelling crane comprises an overhead travelling crane running rail and a plurality of overhead travelling cranes, wherein a first temporary storage position and a second temporary storage position are arranged around the overhead travelling crane running rail;
the material control system is used for controlling the operation of the crown block and commanding the first crown block to carry the first wafer box to target equipment; in the process of carrying the first wafer box to the target equipment by the first crane, the material control system judges whether a second wafer box exists on the target equipment when the first wafer box reaches the target equipment, and if so, a combined carrying command is sent; otherwise, the first crown block is instructed to place the first wafer box on the target equipment;
wherein, the process of combination transport does: carrying the first wafer cassette to a first temporary storage position; transporting the second wafer cassette from the target apparatus to a second temporary location; carrying the first wafer cassette at the first temporary storage position to target equipment; and removing the second wafer cassette at the second temporary storage position.
Example III
The invention also discloses a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the overhead travelling crane handling method in the first embodiment.
Example IV
The invention also discloses overhead travelling crane carrying equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the overhead travelling crane carrying method in the first embodiment is realized when the processor executes the computer program.
The prior art cannot avoid the defect of single carrying task, and can only effectively shorten the carrying time by sacrificing the carrying efficiency of the system and utilize the space to change the time. The invention starts from the actual logistics carrying of a factory, and aims at the problem of the defect of single carrying capability of automatic dispatching in the current semiconductor factory, and combines the advanced dispatching and temporary storage position group setting to carry out combined carrying, so that the method for converting the advanced dispatching task from the combination of a plurality of single carrying tasks into the combined carrying of integral multi-stage carrying scenes is provided, and the characteristic that the current single task can only carry point-to-point is avoided.
According to the invention, by utilizing the characteristics of a material conveying system, a combined conveying mode of loading and unloading of a machine platform is designed by a single crown block, the defect that one crown block can only execute a point-to-point conveying task once is overcome, multiple conveying is avoided to the maximum extent, and the single-vehicle executing efficiency of the crown block is improved. Meanwhile, waiting of equipment machine for loading and unloading is reduced to the greatest extent, logic of logistics transportation is optimized, efficiency of the overhead travelling crane transportation system is improved, and the requirement on the number of overhead travelling cranes is reduced. Thereby further reduced latency, the furthest compression machine is because the latency that production transport caused, promotes production efficiency.
The invention is applied to a typical transportation dispatching scene of a 12-inch semiconductor manufacturing factory, and a dispatching system and a material control system are integrated, so that the advanced dispatching and combined transportation can be realized.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A crown block handling method, comprising:
the first crane obtains a conveying instruction and executes a task of conveying the first wafer box to target equipment;
judging whether a second wafer box exists on target equipment when the first wafer box reaches the target equipment or not in the process of carrying the first wafer box to the target equipment by the first crane, and carrying out combined carrying if the second wafer box exists on the target equipment; otherwise, the first crown block places the first wafer cassette on target equipment;
the combined carrying process comprises the following steps:
s10: carrying the first wafer cassette to a first temporary storage position;
s20: transporting a second wafer cassette from the target apparatus to a second temporary location;
s30: carrying the first wafer cassette at the first temporary location onto a target device;
s40: removing the second wafer cassette at the second temporary storage location;
the first temporary storage position and the second temporary storage position are located around the travelling rail of the crown block.
2. The overhead travelling crane handling method according to claim 1, wherein: and in the process of carrying the first wafer box to target equipment by the first trolley, the second wafer box is processed, and the second trolley carries the second wafer box to the target equipment.
3. The overhead travelling crane handling method according to claim 2, wherein: and when the first wafer box reaches the target equipment, the second wafer box is positioned on the target equipment, and the second crown block cancels the task of carrying the second wafer box.
4. A crown block handling method according to claim 1 or 3, characterized in that: when the first wafer box reaches the target equipment, if the second wafer box on the target equipment is processed, the first crane executes the S10-S40; and if the second wafer box is not finished, the first crown block conveys the first wafer box to the first temporary storage position and leaves the first temporary storage position, and after the second wafer box is finished, the third crown block executes S20-S40.
5. The overhead travelling crane handling method according to claim 1, wherein: the process of acquiring the carrying instruction by the first crane is as follows: obtaining the time after processing according to the residual processing time of the second wafer box in the target equipment; on the basis of the processing completion time, a conveying instruction is sent to the first crown block 120s-240s in advance, and the first crown block is conveyed to the position where the first wafer box is located.
6. The utility model provides a crown block handling system which characterized in that: comprising the following steps:
the overhead travelling crane comprises an overhead travelling crane running rail and a plurality of overhead travelling cranes, wherein a first temporary storage position and a second temporary storage position are arranged around the overhead travelling crane running rail;
the material control system is used for controlling the crown block to operate and commanding the first crown block to carry the first wafer box to target equipment; in the process of carrying the first wafer box to target equipment by the first crane, the material control system judges whether a second wafer box exists on the target equipment when the first wafer box reaches the target equipment, and if so, a combined carrying command is sent; otherwise, the first crown block is instructed to place the first wafer cassette on target equipment;
wherein, the process of combination transport does: carrying the first wafer cassette to the first temporary storage position; transporting a second wafer cassette from the target apparatus to the second temporary location; carrying the first wafer cassette at the first temporary location onto a target device; and removing the second wafer cassette at the second temporary storage position.
7. The overhead travelling crane handling system according to claim 6, further comprising: and the production execution system is used for sending a task for carrying the first wafer box to the material carrying system according to the remaining processing time of the second wafer box in the target equipment, the material carrying system is used for sending an instruction for carrying the first wafer box to the first trolley, the first trolley is used for executing the instruction for carrying the first wafer box, and the material carrying system is used for feeding back the execution condition of the task to the production execution system.
8. The overhead travelling crane handling system according to claim 7, wherein the production execution system sends a task of handling the second wafer to the material handling system based on the information of the completion of the processing of the second wafer, and the material handling system sends an instruction to handle the second wafer cassette to the second overhead travelling crane.
9. The overhead travelling crane handling system according to claim 8, wherein when the first overhead travelling crane is handling the first wafer cassette to the target apparatus, the material handling system obtains that the second overhead travelling crane has not arrived at the second wafer, and sends an instruction that the second overhead travelling crane cancel handling the second wafer cassette.
10. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program, when executed by a processor, implements the crown block handling method according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410033143.6A CN117747514A (en) | 2024-01-09 | 2024-01-09 | Crown block carrying method, crown block carrying system and crown block carrying medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410033143.6A CN117747514A (en) | 2024-01-09 | 2024-01-09 | Crown block carrying method, crown block carrying system and crown block carrying medium |
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| CN117747514A true CN117747514A (en) | 2024-03-22 |
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| CN202410033143.6A Pending CN117747514A (en) | 2024-01-09 | 2024-01-09 | Crown block carrying method, crown block carrying system and crown block carrying medium |
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