An automatic gearbox main shaft assembly part picking, scheduling and logistics system and method

Abstract

The application discloses an automatic gearbox main shaft assembly part picking and scheduling logistics system and method, which is provided with a standby material area, a picking material area, a robot working area and a picking station conveying line in parallel; the picking station conveying line is sequentially provided with empty frame positions, working positions and unloading positions along a conveying direction; the working positions are sequentially provided with a code scanning position, a working position 1, a buffer position 1, a buffer position 2 and a working position 2 along the conveying direction; the standby material area and the picking material area are sequentially provided with a one-shaft gear placing area, a one-shaft speed distribution gear placing area, a two-shaft first-gear gear placing area, a two-shaft second-gear gear placing area, a two-shaft third-gear gear placing area, a two-shaft reverse-gear gear placing area and a two-shaft placing area along the conveying direction of the picking station conveying line. The application avoids repeated warehouse-out and warehouse-in operations, realizes smooth switching, greatly reduces the switching time and saves about 30% of the switching order time. The mode reduces the data transmission interface, prevents data confusion caused by network fluctuation or interface lag and makes the data more accurate.

Description

Technical Field

[0001] This invention belongs to the field of automatic scheduling methods, specifically an automatic transmission main shaft assembly parts picking and scheduling logistics system and method. Background Technology

[0002] Dual-intermediate-shaft AMT automatic transmissions offer high load-bearing capacity, smooth shifting, and suitability for high torque demands. However, their key components, such as the main shaft sub-assemblies, are numerous, complex to assemble, and require fast cycle times, placing high demands on component logistics and distribution capabilities. Achieving timely, accurate, and lean logistics requires a well-thought-out picking and distribution scheduling strategy. Currently, the industry faces the following problems in the logistics and distribution of similar sub-assemblies:

[0003] (1) A single gearbox main shaft sub-assembly contains a variety of gear shaft parts, and there are many models of gearbox assemblies on the same production line. In order to adapt to the parameter requirements of different OEMs for gearboxes, the main shaft sub-assemblies are also divided into a variety of models. At the same time, the gear shaft parts that make up them are also different. The combination of multiple part numbers makes the requirements of this workstation very complicated and the logistics distribution scheduling is a strict test.

[0004] (2) To meet the above production requirements and considering the lean manufacturing concept, the SPS logistics distribution model (precise material distribution according to the needs of a single product on the production line) is adopted. This model is suitable for flexible manufacturing with multiple varieties and small batches. However, this logistics model requires material requirements to be decomposed in the logistics picking preparation area according to the work order requirements. All parts required for a spindle assembly are identified and sorted, then placed in a container and delivered to the line side by AGV. This product has many types of parts, heavy weight, and gear parts have high similarity in appearance. Currently, the domestic industry uses manual picking. This model requires high labor costs and high labor intensity, and it is difficult to distinguish them, which can easily lead to errors in material preparation. If the errors are not detected in time when they flow into the production line, they will cause serious consequences.

[0005] (3) When picking the parts required for this sub-assembly, the industry cannot use the remaining materials from the previous work order to continue picking in the next work order. Instead, the remaining materials from the previous batch are completely cleared out first, and then the materials for the production change are redistributed. This will seriously waste production time and reduce production efficiency. Summary of the Invention

[0006] This invention provides an automatic transmission spindle assembly parts picking and scheduling logistics system and method, which solves the material picking problem required for the spindle assembly and meets the production requirements of automatic outbound, sorting, distribution and seamless work order switching of all parts.

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] An automatic transmission main shaft assembly parts picking and scheduling logistics system, configured in parallel:

[0009] Spare material area, picking area, robot work area and picking station conveyor line;

[0010] The picking station conveyor line is set up with empty frame positions, working positions and unloading positions in sequence along the conveying direction;

[0011] The robot work area is equipped with robot work tracks, including Robot No. 1 and Robot No. 2;

[0012] The workstation is set up along the conveying direction with a barcode scanning position, workstation 1, buffer position 1, buffer position 2 and workstation 2, and robot number 1; half of the picked parts are completed by robot number 1 at workstation 1, and the other half of the picked parts are completed by robot number 2 at workstation 2.

[0013] The workstations in the spare material area and the picking material area correspond to each other, and along the conveying direction of the picking workstation conveyor line, they are in sequence the first shaft gear placement area, the first shaft speed gear placement area, the second shaft first gear placement area, the second shaft second gear placement area, the second shaft third gear placement area, the second shaft reverse gear placement area, and the second shaft placement area.

[0014] Optionally, multiple one- and two-axis sorting unit loading trays are placed on the picking station conveyor line, including a rectangular tray body, on which one-axis gear placement position, one-axis speed gear placement position, two-axis first gear placement position, two-axis second gear placement position, two-axis third gear placement position, two-axis reverse gear placement position, and two-axis placement position are evenly arranged.

[0015] The structures of the first shaft gear placement position, the first shaft speed distribution gear placement position, the second shaft first gear placement position, the second shaft second gear placement position, the second shaft third gear placement position, and the second shaft reverse gear placement position are the same. They are all Y-shaped support frames. The Y-shaped end of the support frame extends upward with a limiting protrusion. A Y-shaped support block extends upward from the top center of the support frame. A fixing screw is set at the bottom center of the support frame.

[0016] The two-axis placement position is located at one corner of the pallet body, including an upper limit plate and a lower limit plate arranged in parallel. The upper limit plate and the lower limit plate are connected and penetrated by four long screws. The center of the upper limit plate and the lower limit plate are both provided with vertical mounting holes, and a cylinder is interference-fitted between the two mounting holes.

[0017] Optionally, a feeding AGV can be installed at the receiving end of the picking station conveyor line, and a discharging AGV can be installed at the unloading end.

[0018] Optionally, a return storage position is provided at the left end of the gear placement area of ​​the picking area; and a picking storage position is provided at the left end of the gear placement area of ​​the spare material area.

[0019] Optionally, an automated storage and retrieval system (AS / RS) area can be set up next to the standby material area; and an outbound RGV can be set up perpendicular to the AS / RS area, standby material area, picking area, robot work area and picking station conveyor line.

[0020] A method for picking, scheduling, and logistics of automatic transmission main shaft assembly parts, implemented using any of the automatic transmission main shaft assembly parts picking, scheduling, and logistics systems described in this invention, specifically includes:

[0021] Work order issuance process:

[0022] 1) Workshop schedulers use the MES system to schedule production, create work orders and material requisition forms, and issue production plans;

[0023] 2) The MES system sends the material requisition form to the WMS system. The WMS system compares the available inventory in the automated warehouse. If the inventory is sufficient, the material requisition form is used and a replenishment task is generated to move the material from the automated warehouse to the spare material area. At the same time, the WMS system synchronizes the work order demand information to the WCS.

[0024] Outbound material preparation process:

[0025] 3) The spare material area is divided into different parts storage areas according to the type of parts, with a total of 22 spare material positions. Among them, positions 1-4 are for single-axis gears, positions 5-6 are for single-axis gears, positions 7-10 are for two-axis gears, positions 11-12 are for two-axis gears, positions 13-16 are for two-axis gears, positions 17-20 are for two-axis gears, and positions 21-22 are for two-axis gears. Each type of material placement area is divided into physical placement positions and empty frame placement positions, which are arranged alternately. Each physical placement position is adjacent to an empty frame placement position for storing empty workstation tools after picking.

[0026] 4) The WMS system sets the entire spare material area as storage location 06, numbered from 0601 to 0622 from left to right, and records the accounting status of each storage location separately; at the initial start-up state, the accounting status of all storage locations is 0; when the WMS detects that the accounting status of a storage location containing a certain part is 0, it continues to check whether there is a replenishment task. If both conditions are met, a warehouse instruction is issued to the WCS system, with the starting point being the automated warehouse and the ending point being the corresponding required storage location in the spare material area;

[0027] 5) The WCS receives the outbound instruction from the WMS, dispatches the outbound RGV to transport the materials to the waiting-to-pick temporary storage location, and then calls the picking RGV to transport the materials to the corresponding required storage location in the spare material area; this cycle continues until all storage locations in the spare material area are filled; each batch of materials outbound is recorded as a separate outbound task in the WMS system. After the picking RGV completes the placement, the WCS reports the task completion to the WMS, and the WMS adjusts the accounts, recording the inventory account status of each material storage location in the spare material area;

[0028] 6) The physical placement location of each material in the picking area corresponds one-to-one with the empty frame placement location and the location category in the spare material area. Photoelectric sensors are installed at the bottom of the shelves in the picking area to detect whether the location is empty.

[0029] Warehouse transfer and replenishment process:

[0030] 7) When the photoelectric sensor detects that a certain material is not in a vacant location in the picking area, it reports to the WCS system. The WCS then requests the WMS to issue a material movement task to move the material in short supply from the spare material area to the picking area.

[0031] 8) WMS sets the picking area to location 05, and from left to right, locations numbered 0501 to 0522, with each location recording its accounting status separately; initially, all locations have an accounting status of 0; when WMS issues a move task, WCS receives the task, schedules the picking RGV to move the missing material from the spare material area to the picking area, and then reports to WMS that the task is completed. WMS adjusts the accounting, deducting from location 06 and adding it to the corresponding location in the picking area (3);

[0032] 9) After WCS completes the warehouse transfer task, it sends all the work order requirements, material types, material quantities, and workstation tool codes to the robot picking system. The picking system then compares the materials with the work order requirements to determine the next material to be picked.

[0033] Picking process:

[0034] 10) The loading pallet of the one-axis and two-axis sorting unit is delivered from the production line by the loading AGV on the left side. It travels from left to right on the conveyor line at the picking station, in the order of empty frame position, working position and unloading position. When the pallet reaches the working position, the barcode scanner scans the unique code of the loading pallet of the one-axis and two-axis sorting unit, records it in the picking system, and synchronizes it to the WCS and WMS systems to prepare for subsequent picking accounting adjustments. The picking system PLC controls the limit blocking mechanism below the conveyor line to rise and fix the position of the empty pallet in preparation for picking.

[0035] 11) Robot No. 1 and Robot No. 2 each correspond to different types of materials in the picking area, move left and right in the guide rail, and are equipped with multi-functional grippers and vision cameras to verify the orientation of parts before gripping; the picking system controls Robot No. 1 to match four types of materials: one-axis gear, one-axis speed-dividing gear, two-axis first gear, and two-axis second gear, and pick them into the loading pallet of the one- and two-axis sorting unit according to the work order requirements. After completion, the picking system PLC lowers the limit blocking mechanism below the conveyor line, releases the pallet and transfers it to the next picking station. The previous picking station continues to receive the loading pallet of the one- and two-axis sorting unit for the next picking.

[0036] 12) When the pallet of the first and second axis sorting unit picked by the first robot arrives at the picking station, the PLC of the picking system controls the limit blocking mechanism below the conveyor line of the picking station to rise and fix the pallet of the first and second axis sorting unit picked by the first robot, in preparation for picking again.

[0037] 13) The picking system controls the second robot to match the two-axis three-speed gear, the two-axis reverse gear, and three types of materials on the two axes. It picks the materials according to the work order requirements and places them into the loading pallet of the first and second axis sorting unit. After completion, the picking system PLC controls the lower limit blocking mechanism of the picking station to descend and release the pallet to the picking station. The pallet is picked and flows into the subsequent unloading area, where it is picked up by the unloading AGV and sent to the production line. When the loading pallet of the first and second axis sorting unit has finished picking all the materials, it reports to the WMS system. All the materials picked from the pallet are deducted from their respective material placement positions in the picking area, and an SPS encapsulation account is generated and bound to the unique SPS barcode previously scanned and uploaded to the WMS by the barcode scanner.

[0038] Optional, also includes:

[0039] Empty workstation equipment return process:

[0040] Each time the robot picks a layer of material, it grabs the empty workstation equipment and places it into the adjacent empty frame placement area that matches the physical placement area of ​​each physical item in the picking area for palletizing. When the picking system records that the number of palletized layers in the empty frame placement area has reached the maximum value, it requests the WCS system to move the empty frame from empty frame area 05 to empty frame placement area 06. The positions correspond one by one. The WCS system requests the WMS to issue an empty frame inbound task. After the WMS verifies that the empty frame information is accurate, it issues a transfer task. The WCS receives the task and schedules the picking RGV to transfer the empty frame to empty frame placement area 06. Then the WMS continues to issue an empty frame return to the automated warehouse task. The WCS receives the task and again schedules the picking RGV to place the palletized empty workstation equipment in empty frame placement area 06 into the return empty temporary storage position. Subsequently, the WCS continues to schedule the outbound RGV to return the empty workstation equipment to the automated warehouse.

[0041] Surplus material return process:

[0042] If the picking system detects that all materials required by the work order have been picked and there are still remaining materials at the physical placement location in the picking area, a return process is triggered: The picking system compares whether the next work order still requires the remaining materials at the current physical placement location 05 in the picking area. If so, picking continues. If the work order switches and no longer requires this type of material, the picking system sends a return request to the WCS. The WCS requests the WMS to issue a return task. After receiving the request, the WCS schedules the picking RGV to transport the remaining materials directly from location 05 to the empty temporary storage location. After the task is completed, the WMS deducts the corresponding picking area location's account balance.

[0043] Optionally, in the picking process, the workstations are divided from left to right into a scanning station, workstation 1, buffer station 1, buffer station 2, and workstation 2; half of the parts to be picked are picked by robot number one at workstation 1, and the other half are picked by robot number two at workstation 2; the picking process of this scheme is as follows: after the scanning station scans the QR code of the loading pallet of the one-axis and two-axis sorting unit, the information is uploaded to the WCS and WMS systems, and the pallet number is recorded; after recording, the loading pallet of the one-axis and two-axis sorting unit flows into workstation 1, the limiting mechanism lifts and locks the pallet, and robot number one begins picking; after picking is completed, the limiting mechanism of workstation 1 is lowered, and the loading pallet of the one-axis and two-axis sorting unit moves to workstation 2;

[0044] ① At this time, as long as the photoelectric detection of buffer position 1, buffer position 2 and working position 2 is empty, the second robot will immediately execute the picking task of the pallet. The action is performed in advance on the way from the first and second axis sorting unit to the working position 2; when the first and second axis sorting unit arrives at the working position 2, the second robot has already prepared the first part to be picked and put it into place.

[0045] ② If the photoelectric detection at workstation 2 indicates that there is goods, it means that there is a pallet being picked at workstation 2. The current first and second axis sorting unit's loading pallet stops and waits after reaching buffer position 2. After the first and second axis sorting unit's loading pallet at workstation 2 completes picking, the current first and second axis sorting unit's loading pallet moves towards workstation 2. After the movement is triggered, the second robot also performs the action in advance. When the first and second axis sorting unit's loading pallet reaches workstation 2, the second robot has already prepared and placed the first part that needs to be picked.

[0046] ③ If both workstation 2 and buffer station 2 have photoelectric detection indicating that there is goods, then the loading pallets of the first and second axis sorting units will wait in line at buffer station 1.

[0047] The advantages of this invention are:

[0048] The logistics system presented in this invention avoids repetitive outbound and inbound operations when switching between multiple work orders, as several product types share parts. This results in smoother switching, significantly reducing changeover time by approximately 30%. Furthermore, this mode reduces data transmission interfaces, preventing data corruption caused by network fluctuations or interface lag, and ensuring greater data accuracy. Similarly, for each new part box being picked, the robot re-identifies the physical quantity and compares it with the recorded quantity. This picking mode maximizes the accuracy of the records, detects errors early, reduces downtime and outbound errors caused by manual data entry or mechanical failures, improves picking smoothness, reduces potential problems, and lowers downtime by 20% due to discrepancies between the physical quantity and the system record. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0050] Figure 1 The two axes are: a) a first-axis gear placement position, b) a first-axis speed-dividing gear placement position, c) a second-axis first-gear placement position, d) a second-axis second-gear placement position, e) a second-axis third-gear placement position, f) a second-axis reverse gear placement position, g) a second-axis placement position, and h) the pallet body.

[0051] Figure 2 This is a schematic diagram of the automatic transmission spindle assembly parts robot picking and scheduling logistics system of the present invention;

[0052] Figure 3 for Figure 2 Functional distribution diagram of the material preparation area and material picking area in the middle;

[0053] Figure 2 and 3 In the diagram, 1-Automatic warehouse, 2-Spare material area, 3-Picking area, 4-Outbound RGV, 5-Picking temporary storage location, 6-Picking RGV, 7-Single-axis gear placement area, 8-Single-axis speed distribution gear placement area, 9-Two-axis first-gear placement area, 10-Two-axis second-gear placement area, 11-Two-axis third-gear placement area, 12-Two-axis reverse gear placement area, 13-Two-axis placement area, 14-Empty frame location, 15-Working station, 16-Unloading location, 17-Loading AGV, 18-Unloading AGV, 19-Robot No. 1, 20-Robot No. 2, 21-Return empty temporary storage location, 22-Picking station conveyor line, 23-Bar scanner;

[0054] Figure 4 for Figure 2 The robot workstation distribution diagrams are shown in Figure A and Figure B. Figure A shows the distribution diagram of the prior art, while Figure B shows the distribution diagram of the present invention. Detailed Implementation

[0055] The technical solution of the present invention will be further described below with reference to the embodiments, but it is not limited thereto. Any modifications or equivalent substitutions to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered within the protection scope of the present invention.

[0056] If manufactured using the same methods as ordinary parts, with material distribution handled by line-side racks, the main spindle assembly requires a large number of parts. During peak work order periods, multiple parts may be issued simultaneously, impacting stacker crane efficiency and causing delays in material delivery. Furthermore, the assembly requires gear shafts with similar shapes and dimensions. Manual picking would be labor-intensive and prone to errors, leading to mismatches or omissions. Assembly line operators, frequently switching between multiple work orders, are also susceptible to picking the wrong parts, causing quality issues. All these problems result in significant risks throughout the logistics process, contradicting lean manufacturing principles.

[0057] In the production of the spindle assembly, this invention uses a dual-station seven-axis robot with vision recognition to pre-grab all the parts required for one batch of the assembly and store them on a dedicated one- or two-axis sorting unit pallet. This dedicated pallet is designed for one batch of pre-selected parts. After the seven types of parts—one-axis gear, one-axis speed-dividing gear, two-axis first-gear, two-axis second-gear, two-axis third-gear, two-axis reverse gear, and two-axis gear—are selected, the pallet is automatically delivered to the line by an AGV. The operator can then directly take the parts from the pallet. After one batch of the assembly is assembled, the material on the pallet is emptied, and the empty pallet is returned to the picking line.

[0058] Due to the variety of parts and the large buffer capacity requirement, a dual-station 7-axis robot is designed for picking, with a total of 20 picking stations. Stations 1-8 are empty frame positions for buffering empty frames after loading; station 9 is picking station 1, corresponding to robot 1; stations 10 and 11 are picking buffer positions for buffering materials between robots 1 and 2; station 12 is picking station 2, corresponding to robot 2; and stations 13-20 are unloading stations. Gear parts frames have a maximum of 6 layers, and shaft parts frames have a maximum of 4 layers. Material delivery adopts an RGV automated delivery and outbound mode, divided into a sorting area and a reserve area, each with 22 material feeding channels, all corresponding to each other. The reserve area and sorting area are divided according to material type, and each material position has a corresponding empty frame placement space reserved next to it for buffering empty frames after picking. The robot grabs parts from the sorting area and places them at the picking station to complete the picking operation.

[0059] Combination Figure 1-3The automatic transmission main shaft assembly parts picking and scheduling logistics system of the present invention is arranged in parallel as follows: a spare material area 2, a picking material area 3, a robot working area, and a picking station conveyor line 22; the picking station conveyor line 22 is arranged sequentially along the conveying direction with an empty frame position 14, a working position 15, and a unloading position 16; the robot working area is equipped with a robot working track, including a first robot 19 and a second robot 20; the working position 15 is arranged along the conveying direction with a barcode scanning position, a working position 1, a buffer position 1, a buffer position 2, and a working position. 2. Robot No. 1; half of the picked parts are completed by Robot No. 19 at workstation 1, and the other half of the picked parts are completed by Robot No. 20 at workstation 2; the workstations of the spare material area 2 and the picking material area 3 correspond to each other, and along the conveying direction of the picking workstation conveyor line, they are in sequence the first shaft gear placement area 7, the first shaft speed gear placement area 8, the second shaft first gear placement area 9, the second shaft second gear placement area 10, the second shaft third gear placement area 11, the second shaft reverse gear placement area 12, and the second shaft placement area 13.

[0060] In this disclosure, multiple one- and two-axis sorting unit loading pallets are placed on the picking station conveyor line, including a rectangular pallet body h. On the pallet body, a one-axis gear placement position a, a one-axis speed-dividing gear placement position b, a two-axis first-gear placement position c, a two-axis second-gear placement position d, a two-axis third-gear placement position e, a two-axis reverse gear placement position f, and a two-axis placement position g are evenly arranged. The one-axis gear placement position a, the one-axis speed-dividing gear placement position b, the two-axis first-gear placement position c, the two-axis second-gear placement position d, the two-axis third-gear placement position e, and the two-axis reverse gear placement position f have the same structure, all of which are Y-shaped support frames. The Y-shaped end of the support frame extends upward with a limiting protrusion. A Y-shaped support block extends upward from the top center of the support frame. A fixing screw is provided at the bottom center of the support frame.

[0061] The two-axis placement position g is located at one corner of the pallet body h, including an upper limit plate and a lower limit plate arranged in parallel. The upper limit plate and the lower limit plate are connected and penetrated by four long screws. The center of the upper limit plate and the lower limit plate are both provided with vertical mounting holes, and a cylinder is interference-fitted between the two mounting holes.

[0062] In this disclosure, a feeding AGV (17) is installed at the receiving end of the picking station conveyor line 22, and a discharging AGV (18) is installed at the unloading end.

[0063] In this disclosure, a temporary storage position 21 for emptying is provided at the left end of the gear placement area of ​​the picking area 3; and a temporary storage position 5 for picking is provided at the left end of the gear placement area of ​​the spare material area 2.

[0064] In this disclosure, an automated storage and retrieval system (AS / RS) 1 is set up next to the spare material area 2; and an outbound RGV (4) is set up perpendicularly to the AS / RS 1, spare material area 2, picking area 3, robot work area and picking station conveyor line 22.

[0065] Logistics Information System Function Description:

[0066] 1) MES (Manufacturing Execution System): Used for production planning, issuing work orders, and generating material requirements lists.

[0067] 2) WMS (Warehouse Management System): Used to record inventory records, issue outbound, inbound, and transfer tasks, and send instructions to the WCS (Warehouse Control System).

[0068] 3) WCS Warehouse Control System: Used to receive tasks from the WMS system, interface with electrical control systems such as RGV, picking system, and photoelectric signal control, and drive scheduling equipment to complete instructions.

[0069] The specific implementation method is as follows:

[0070] Work order issuance process:

[0071] 1) Workshop schedulers use the MES system to schedule production, create work orders and material requisition forms, and issue production plans.

[0072] 2) The MES system sends the material requisition form to the WMS system. The WMS system compares the available inventory in the automated warehouse 1. If the inventory is sufficient, the material requisition form is used, and a replenishment task is generated to move the material from the automated warehouse to the spare material area 2. Simultaneously, the WMS system synchronizes the work order demand information to the WCS system.

[0073] Outbound material preparation process:

[0074] 3) Spare Material Area 2 is divided into different parts storage areas according to the type of parts, with a total of 22 spare material positions. Among them, positions 1-4 are the placement area for single-axis gears 7, positions 5-6 are the placement area for single-axis gears 8, positions 7-10 are the placement area for two-axis first-gears 9, positions 11-12 are the placement area for two-axis second-gears 10, positions 13-16 are the placement area for two-axis third-gears 11, positions 17-20 are the placement area for two-axis reverse gears 12, and positions 21-22 are the placement area for two-axis gears 13. Each type of material placement area is divided into physical placement positions and empty frame placement positions, which are arranged alternately. Each physical placement position is adjacent to an empty frame placement position for storing empty workstation tools after picking.

[0075] 4) The WMS system sets the entire spare material area 2 as location 06, numbered sequentially from left to right as locations 0601 to 0622. Each location is recorded separately, including the quantity of parts, tool number, and material number. Initially, all locations have zero entries. When the WMS detects that the entry for a specific part in a location is zero, it checks for a replenishment task. If both conditions are met, a replenishment command is issued to the WCS system, originating from the automated warehouse 1 and ending at the corresponding required location in spare material area 2.

[0076] 5) The WCS receives the outbound instruction from the WMS, dispatches the outbound RGV (4) to transport the material to the waiting-to-pick temporary storage location 5, and then dispatches the picking RGV (6) to transport the material to the corresponding required location in the spare material area 2. This process is repeated until all physical placement locations in the spare material area 2 are filled. Each batch of material outbound is recorded as a separate outbound task in the WMS system. After the picking RGV (5) is placed, the WCS reports the task completion to the WMS, and the WMS adjusts the accounts, recording the inventory status of each material physical placement location in the spare material area 2.

[0077] 6) In picking area 3, the physical storage locations for each type of material and the empty storage locations correspond one-to-one with the storage locations in spare material area 2. Photoelectric sensors are installed at the bottom of the shelves in picking area 3 to detect whether a storage location is empty.

[0078] Warehouse transfer and replenishment process:

[0079] 7) When the photoelectric sensor detects that a certain material is not in a physical location in the picking area 3, it reports to the WCS system. The WCS requests the WMS to issue a material movement task to move the material in short supply from the spare material area 2 to the picking area 3.

[0080] 8) WMS sets picking area 3 as location 05, and locations numbered 0501 to 0522 from left to right, with each location having its own accounting record. Initially, all locations have an accounting record of 0. When WMS issues a move task, WCS receives the task, schedules picking RGV (6) to move the missing material from spare material area 2 to picking area 3, and then reports to WMS that the task is complete. WMS adjusts the accounting record, deducting from location 06 and adding the deduction to the corresponding location in picking area 3.

[0081] 9) After WCS completes the warehouse transfer task, it sends all the work order requirements, material types, material quantities, and workstation tool codes to the robot picking system. The picking system then compares the materials with the work order requirements to determine which materials should be picked next.

[0082] Picking process:

[0083] 10) Empty SPS pallets are delivered from the production line via the loading AGV (17) on the left side and travel from left to right on the picking station conveyor line 22. Among them, 1-8 are empty frame positions 14, 9-12 are working positions 15, and 13-20 are unloading positions 16. When the pallet arrives at position 9, i.e., working position 1, the barcode scanner 23 in front of position 9 scans the unique code of the loading pallet of the first and second axis sorting unit, records it in the picking system, and synchronizes it to the WCS and WMS systems to prepare for subsequent picking accounting adjustments. The picking system PLC controls the limit blocking mechanism below the picking station 9 conveyor line to rise, fix the position of the empty pallet, and prepare for picking.

[0084] 11) Robot 19 and Robot 20 each correspond to three different types of materials in the picking area. They move left and right on the guide rail and are equipped with multi-functional grippers that can simultaneously pick up and place all materials required for the SPS picking spindle assembly and empty workstation fixtures. They are also equipped with vision cameras to check the orientation of parts before picking to prevent damage to the grippers caused by reverse picking, uneven placement of parts, or skewed parts frames. The picking system controls Robot 19 to pick up four types of materials—one-axis gear, one-axis speed-dividing gear, two-axis first-gear gear, and two-axis second-gear gear—from location 05 according to the work order requirements and place them on the loading pallet of the one- and two-axis sorting unit. After completion, the picking system PLC lowers the limit blocking mechanism below the conveyor line of station 9, releases the pallet, and transfers it to picking station 10. Picking station 9 continues to receive empty pallets for the next picking.

[0085] 12) When the loading pallet of the first and second axis sorting unit picked by robot 19 arrives at the picking station 12, the PLC of the picking system controls the limit blocking mechanism below the conveyor line of the picking station 12 to rise, fix the loading pallet of the first and second axis sorting unit picked by robot 19, and prepare for picking again.

[0086] 13) The picking system controls the second robot 20 to pick up the three types of materials at position 05, namely the second-axis third-speed gear, the second-axis reverse gear, and the second-axis material, according to the work order requirements, and place them into the loading pallet of the first and second axis sorting unit. After completion, the picking system PLC controls the lower limit blocking mechanism of the inner conveyor of the picking station 13 to descend and release the pallet to the picking station 13. The pallet is picked and flows into the subsequent unloading area, and is picked up by the unloading AGV (18) at station 20 and sent to the production line. When the loading pallet of the first and second axis sorting unit has finished picking all the materials by the first robot 19 and the second robot 20, it reports to the WMS system, deducts all the materials picked from the picking area 3 (position 05) from their respective material placement positions, and generates an SPS encapsulated account, which is bound to the SPS unique barcode previously scanned and uploaded to the WMS by the barcode scanner.

[0087] Empty workstation equipment return process:

[0088] Each time the robot picks a layer of material, it grabs the empty workstation equipment and places it in the adjacent empty frame placement area matched by each physical placement area of ​​the picking area 2 for stacking. When the picking system records that the number of stacked layers in the empty frame placement area reaches the maximum value, it requests the WCS system to move the empty frame from the 05 empty frame area to the 06 empty frame placement area. The positions correspond one by one. The WCS system requests the WMS to issue an empty frame warehousing task. After the WMS verifies that the empty frame information is accurate, it issues a transfer task. The WCS receives the task and schedules the picking RGV (6) to transfer the empty frame to the 06 empty frame placement area. Then the WMS continues to issue an empty frame return to the automated warehouse 1 task. The WCS receives the task and schedules the picking RGV (6) again to place the stacked empty workstation equipment in the 06 empty frame placement area into the return empty temporary storage position 21. Subsequently, the WCS continues to schedule the outbound RGV (4) to return the empty workstation equipment to the automated warehouse 1.

[0089] Surplus material return process:

[0090] Since the automated warehouse does not have a splitting mode, each outbound shipment is a whole stack of materials, which may result in the outbound materials exceeding the work order's demand. If the picking area 3 (05 physical placement location) detects that all materials required by the work order have been picked in the picking system, and there are still remaining materials, the return process is triggered: the picking system compares whether the next work order still needs the remaining materials in the current picking area 3 (05 physical placement location). If so, picking continues. If the work order switches and no longer needs this type of material, the picking system sends a return request to the WCS. The WCS requests the WMS to issue a return task. After receiving the request, the WCS schedules the picking RGV (6) to transport the remaining materials directly from the 05 physical placement location to the return temporary storage location 21. This temporary storage location is shared with the return storage location and is the same conveyor line. After the task is completed, the WMS deducts the corresponding accounting for the picking area 3 (05 physical placement location).

[0091] Problems that may occur if the above solutions are not applied:

[0092] 1. Picking: Original picking plan Figure 4 Figure A in

[0093] The picking station conveyor lines 8-12 are workstation 15. The five workstations, from left to right, are: barcode scanning station - workstation 1 - workstation 2 - workstation 3 - workstation 4. All parts to be picked are evenly distributed to the four workstations for completion. Robot 19 corresponds to workstation 1 / 2; Robot 20 corresponds to workstation 3 / 4.

[0094] The picking process is as follows: After scanning the QR code on the pallet of the first and second axis sorting unit at workstation 8, the information is uploaded to the WCS and WMS systems, and the pallet number is recorded. After recording, the pallet flows to workstation 19, where the limiting mechanism lifts and holds the pallet. Once the pallet is fixed, robot 19 reads the parts to be picked at workstation 1, moves, photographs, identifies, and picks them up. After completion, the limiting mechanism at workstation 1 lowers, and the pallet flows to workstation 210. Once in place, the limiting mechanism at workstation 2 is fixed, and robot 19 picks the parts to be picked at workstation 2. This process continues, with the pallets moving to workstations 3 and 4 respectively. After being fixed, the robot searches for the picking task and performs the picking action. After picking at workstation 4 is completed, the entire picking process is finished.

[0095] Current solution: Figure 4 Figure B in

[0096] The picking station conveyor lines 8-12 are workstations, arranged from left to right as follows: barcode scanner - workstation 1 - buffer station 1 - buffer station 2 - workstation 2. Half of the parts to be picked are picked at workstation 1 by robot 19, and the other half are picked at workstation 2 by robot 20. The picking process is as follows: After barcode scanner 8 scans the QR code on the pallet of the two-axis sorting unit, the information is uploaded to the WCS and WMS systems, and the pallet number is recorded. After recording, the pallet flows into workstation 19, where the limiting mechanism lifts and holds the pallet, and robot 19 begins picking. After picking is completed, the limiting mechanism at workstation 1 lowers, and the pallet of the two-axis sorting unit moves to workstation 2.

[0097] ① At this point, as long as the photoelectric detectors at buffer position 1, buffer position 2, and work position 2 are empty, robot 20 will immediately execute the picking task for that pallet. While the pallet is being loaded from the first- and second-axis sorting units and is en route to work position 2, the robot will perform pre-reading of the work order and picking task, completing actions such as photo recognition and part grabbing. When the pallet arrives at work position 2, robot 2 will have already prepared and placed the first part to be picked.

[0098] ② If the photoelectric sensor at workstation 2 detects an item in stock, it means a pallet is being picked at workstation 2. The current pallet will stop waiting once it reaches buffer position 2. After the pallet at workstation 2 completes its picking, it moves towards workstation 2. Upon triggering the movement, robot 20 will also read the work order and picking task in advance, performing actions such as photo recognition and part grabbing. When the pallet arrives at workstation 2, robot 20 will have already prepared and placed the first part to be picked.

[0099] ③ If both working station 2 and buffer station 2 have items detected by photoelectric sensors, then the tray will wait in line at buffer station 1.

[0100] This picking scheme focuses on advancing the reading, identification, grasping, and placement actions of robot 20, synchronizing them with the pallet's movement. This can greatly reduce the waiting time after the pallet arrives at workstation 2, and can even allow the robotic arm to prepare in advance before the pallet arrives, significantly improving picking efficiency by more than 70%.

[0101] 2. Picking: In the original solution, the conveyor lines of workstations 1 / 2 and 3 / 4 share a single motor, which can only rotate or stop simultaneously. Furthermore, the positioning is done using an 8mm proximity switch, which results in inaccurate positioning. If the distance between two consecutive pallets is too large or too small, it is impossible to control the two pallets to stop precisely in the picking area of ​​workstations 1 and 2. This causes robots 19 and 20 to frequently alarm due to inaccurate identification and positioning, resulting in picking line stoppages and affecting on-site production.

[0102] The current solution adds two motors, and controls workstation 1, buffer station 1, buffer station 2 and workstation 2 separately, which can precisely control the docking of the pallet with the limit mechanism of the workstation; at the same time, the 8mm proximity switch is upgraded to a through-beam photoelectric sensor, which has a faster detection speed, stronger real-time performance, and a range that is dozens of times larger than before, improving the picking robot's recognition success rate by more than 30%.

[0103] 3. Relocation and replenishment of materials:

[0104] The original plan triggered the replenishment from the spare material area (2) to the picking material area (3) by the robot taking a picture and recognizing that the picking area shelf is empty. The robot then uploads the empty signal to the robot picking system and then to the WCS and WMS systems. After receiving the shortage signal, the WMS sends a replenishment task to the WCS system and adjusts the internal records, reducing the spare material area (2) by 1 and increasing the picking material area (3) by 1. After receiving the task, the WCS schedules the RGV to pick up the specified goods from the spare material area to replenish the picking area. After the replenishment is completed, it reports to the WMS system to complete the replenishment process.

[0105] The current solution adds a proximity switch to each shelf in the picking area to monitor the empty and full status of the picking area (3) in real time. The proximity switch is directly integrated into the WCS warehouse control system and communicates directly with WCS. When the location is detected to be empty, WCS directly requests WMS to issue a replenishment task. After WMS processes and adjusts the accounts of the two areas, it issues a replenishment task to WCS and schedules RGV to pick up the goods to complete the replenishment. The current solution changes the condition for triggering replenishment from robot arm recognition to proximity switch recognition, which reduces the robot arm movement and photo taking time, shortens the robot arm travel, and improves efficiency by 50%. In the original solution, after the robot arm recognizes the empty signal, it uploads it to its own picking system. The picking system then reports it to the WCS system, and the WCS system then requests the WMS system to issue a replenishment task. After the change, the WCS system directly recognizes the empty and full location and triggers replenishment, which reduces the cyclic transmission between the picking system and the WCS system, improves the system interaction efficiency, effectively prevents picking line stoppage and material shortage caused by untimely replenishment, and improves picking efficiency by more than 50%.

[0106] 4. Returning surplus material:

[0107] The original plan has no surplus material return process. When the required quantity of the first work order is picked, the picking area (3) will be emptied. The picking system sends a return request to WCS. WCS requests WMS to issue a return task. After receiving the request, WCS schedules RGV to transport the surplus material directly from location 05 to the empty temporary storage location (21). After the task is completed, WMS deducts the corresponding inventory of location 05 in the picking area (3).

[0108] This model is not conducive to rapid production changeover and work order switching. It is inefficient for multi-variety, small-batch production models, with a lot of time wasted on material returns and outbound shipments during the changeover process.

[0109] The current solution adds a residual material verification function. When the MES issues a work order, it synchronizes the work order information to the WMS-WCS-picking system. At the same time, the accounting of the picking area (3) at location 05 is managed in detail by the WMS. The table stores information such as the material type, remaining quantity, and frame code of the picking area (3) at location 05. When the picking of the previous work order is completed, the picking system will check whether the remaining materials in the picking area (3) at location 05 can be used in the next work order. If they can, picking will continue and the WMS will continue to deduct the amount. If they cannot, the material return process will be triggered.

[0110] This mode avoids repetitive outbound and inbound operations when switching between multiple work orders, as several product types share parts, resulting in a smoother switchover and significantly reducing changeover time by approximately 30%. Furthermore, this mode reduces the number of data transmission interfaces, preventing data corruption caused by network fluctuations or interface lag, and ensuring greater data accuracy.

[0111] 5. Accounting Management

[0112] In the original plan, when replenishing from the 06 spare material area (2) to the 05 picking material area (3), the WMS system was used to manage the 05 picking material area (3) in real time. For example, when the RGV transfers a batch of parts (a total of 10) from the 06 spare material area (2) to the 05 picking material area (3), the WMS completes the material transfer task in the WCS. After the receipt is completed, the account is refreshed, deducting the parts in the 06 location to 0, and generating an account of 10 parts in the 05 location. At the same time, the information is synchronized to the WCS and the robot picking system. Subsequently, the robot reads the work order to determine the next material to be picked, moves, grabs, and places it in the SPS pallet. After one placement is completed, the robot arm PLC reports to the picking system. The picking system deducts 1 from the account of the whole batch of parts in the location and reports to the WMS system. The WMS system deducts 1 from the account of the whole batch, thereby realizing the real-time management of the account of the 05 location.

[0113] The drawback of this method is that accounting management only covers one set and does not verify the physical items. If there is an error in the data when the parts are put into storage, such as 9 parts but 10 parts are entered into the accounting records, the robotic arm will report an error and fail to identify the material when picking the last part, requiring manual intervention. If 10 parts are entered into the accounting records but 9 parts are entered into the accounting records, the remaining boxes containing the parts will be returned to the storage as empty boxes and subsequently sent to the production line as empty boxes, causing a production line alarm. Both situations will have a significant impact on production.

[0114] The current solution adds physical parts verification and refines accounting management down to each individual parts box. After the RGV transfers a stack of 10 parts from area 06 to location 05, the WMS synchronizes the number of layers in each stack, the box number on each layer, and the number of parts per layer to the WCS and the robot picking system (for simplicity, we assume two layers with 5 parts per layer). Next, the robot reads the work order to determine the type of material to be picked. Once the robot moves directly above the stack of parts, it scans the barcode and takes a picture of the top box to visually identify the number of parts inside. This is compared to the accounting information from the WMS to determine if the physical quantity matches the accounting record. If they don't match, an alarm is triggered, and the parts are removed manually to prevent erroneous accounting entries from entering the warehouse or production line, impacting production or causing inventory data chaos. If the robot correctly identifies the parts, it moves, picks, and places them, reporting to the picking system. The picking system deducts 1 from the accounting record for the scanned parts in each box (i.e., in this example, the top box has 5 parts - 1 = 4). Similarly, after the top layer of parts has been picked, the robotic arm determines that the box is empty and picks it up to the empty box storage position, preparing to pick the parts for the second layer. At this time, it takes a picture of the actual part and compares it with the quantity recorded in the picking system's WMS. This process continues, with the robot re-identifying the actual quantity and comparing it with the recorded quantity for each new part box. This picking mode maximizes the accuracy of the recorded quantity, detects errors early, reduces downtime and outbound errors caused by manual data entry or mechanical failures, improves picking smoothness, reduces potential problems, and lowers downtime caused by discrepancies between the actual quantity and the system record by 20%.

[0115] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for picking and scheduling logistics of automatic transmission main shaft assembly parts, characterized in that, The process is accomplished using an automatic transmission spindle assembly parts picking and scheduling logistics system, specifically including: Work order issuance process: 1) Workshop schedulers use the MES system to schedule production, create work orders and material requisition forms, and issue production plans; 2) The MES system sends the material requisition form to the WMS system. The WMS compares the available inventory in the automated warehouse (1). If the inventory is sufficient, the material in the material requisition form is used, and a replenishment task is generated to send the material from the automated warehouse to the spare material area (2). At the same time, the WMS system synchronizes the work order demand information to the WCS. Outbound material preparation process: 3) Spare material area (2) The storage areas for different parts are divided according to the type of parts, with a total of 22 spare material positions. Among them, positions 1-4 are the placement area for the first shaft gear (7), positions 5-6 are the placement area for the first shaft speed gear (8), positions 7-10 are the placement area for the second shaft first gear (9), positions 11-12 are the placement area for the second shaft second gear (10), positions 13-16 are the placement area for the second shaft third gear (11), positions 17-20 are the placement area for the second shaft reverse gear (12), and positions 21-22 are the placement area for the second shaft (13). Each type of material placement area is divided into physical placement positions and empty frame placement positions, which are arranged alternately. Each physical placement position is adjacent to an empty frame placement position, which is used to store empty workstation tools after picking. 4) The WMS system sets the spare material area (2) as a whole as location 06, from left to right, from location number 0601 to 0622, and records the accounting status of each location separately; at the initial stage of operation, the accounting status of all locations is 0; when the WMS detects that the accounting status of a certain part location is 0, it continues to check whether there is a replenishment task. If both conditions are met, it issues a warehouse instruction to the WCS system, with the starting point being the automated warehouse (1) and the ending point being the required location of the spare material area (2); 5) WCS receives the outbound instruction from WMS, calls outbound RGV (4) to transport the material to the waiting-to-pick temporary storage location (5), and then calls picking RGV (6) to transport the material to the corresponding required location in the spare material area (2); this cycle continues until all physical placement locations in the spare material area (2) are filled; each batch of material outbound is treated as a separate outbound task in the WMS system. After the picking RGV (6) is placed, WCS reports to WMS that the task is completed, WMS adjusts the accounts and records the inventory accounts of each physical placement location in the spare material area (2); 6) The picking area (3) has a physical storage location for each type of material and an empty storage location. The storage locations in the spare material area (2) correspond one-to-one with each other. Photoelectric sensors are installed at the bottom of the storage racks in the picking area (3) to detect whether the storage location is empty. Warehouse transfer and replenishment process: 7) When the photoelectric sensor detects that a certain material is not in the picking area (3), it reports to the WCS system. The WCS requests the WMS to issue a material movement task to move the material in short supply from the spare material area (2) to the picking area (3). 8) WMS sets the picking area (3) to location 05, and from left to right, locations numbered 0501 to 0522, and records the accounting status of each location separately; initially, the accounting status of all locations is 0; when WMS issues a move task, WCS receives the task, schedules the picking RGV (6) to move the missing materials from the spare material area (2) to the picking area (3), and then reports to WMS that the task is completed. WMS adjusts the accounting status, deducts from location 06, and records it to the corresponding location in the picking area (3); 9) After WCS completes the warehouse transfer task, it sends all the work order requirements, material types, material quantities, and workstation tool codes to the robot picking system. The picking system then compares the materials with the work order requirements to determine the next material to be picked. Picking process: 10) The loading pallet of the first and second axis sorting unit is delivered from the production line by the loading AGV (17) on the left side and moves from left to right on the picking station conveyor line (22); in sequence, it is the empty frame position (14), the working position (15) and the unloading position (16). When the pallet reaches the working position (15), the barcode scanner (23) scans the unique code of the loading pallet of the first and second axis sorting unit, records it in the picking system, and synchronizes it to the WCS and WMS systems to prepare for subsequent picking accounting adjustments and binding; the picking system PLC controls the lower limit blocking mechanism of the conveyor line to rise, fix the position of the empty pallet, and prepare for picking; 11) Robot No. 1 (19) and Robot No. 2 (20) each correspond to different materials in the picking area (3), move left and right in the guide rail, and are equipped with multi-functional grippers and vision cameras to check the direction of the parts before gripping; the picking system controls Robot No. 1 (19) to match four types of materials: one-axis gear, one-axis speed gear, two-axis first gear, and two-axis second gear, and pick them into the loading tray of the one- and two-axis sorting unit according to the work order requirements. After completion, the picking system PLC lowers the limit blocking mechanism below the conveyor line, releases the tray and transfers it to the next picking station. The previous picking station continues to receive the loading tray of the one- and two-axis sorting unit for the next picking. 12) When the first two-axis sorting unit loading pallet picked by the first robot (19) arrives at the picking station, the PLC of the picking system controls the lower limit blocking mechanism of the picking station conveyor line to rise and fix the first two-axis sorting unit loading pallet picked by the first robot (19) in preparation for picking again. 13) The picking system controls the second robot (20) to match the two-axis three-speed gear, the two-axis reverse gear and the two-axis three materials, and pick them into the loading pallet of the first and second axis sorting unit according to the work order requirements. After completion, the picking system PLC controls the picking station to lower the inner lower limit blocking mechanism to release the pallet to the picking station. The pallet is picked and flows into the subsequent unloading area, and is picked up by the unloading AGV (18) and sent to the production line. When the loading pallet of the first and second axis sorting unit has finished picking all the materials through the first robot (19) and the second robot (20), it reports to the WMS system, deducts all the materials picked from the picking area (3) from their respective material placement positions, and generates an SPS encapsulated account, which is bound to the SPS unique barcode previously scanned and uploaded to the WMS by the barcode scanner. The aforementioned automatic transmission main shaft assembly parts picking and scheduling logistics system is set up in parallel: Spare material area (2), picking area (3), robot work area and picking station conveyor line (22); The picking station conveyor line (22) is set with empty frame position (14), working position (15) and unloading position (16) in sequence along the conveying direction. The robot work area is equipped with robot work tracks, including Robot No. 1 (19) and Robot No. 2 (20). The workstation (15) is set with a barcode scanning position, workstation 1, buffer position 1, buffer position 2 and workstation 2 along the conveying direction. One robot; half of the picking parts are completed by the first robot (19) at workstation 1, and the other half of the picking parts are completed by the second robot (20) at workstation 2. The workstations of the spare material area (2) and the picking material area (3) correspond to each other, and along the conveying direction of the picking workstation conveyor line are the first shaft gear placement area (7), the first shaft speed gear placement area (8), the second shaft first gear placement area (9), the second shaft second gear placement area (10), the second shaft third gear placement area (11), the second shaft reverse gear placement area (12), and the second shaft placement area (13).

2. The automatic transmission main shaft assembly parts picking and scheduling logistics method according to claim 1, characterized in that, Multiple one- and two-axis sorting unit loading trays are placed on the picking station conveyor line, including a rectangular tray body (h), and one-axis gear placement position (a), one-axis speed gear placement position (b), two-axis first gear placement position (c), two-axis second gear placement position (d), two-axis third gear placement position (e), two-axis reverse gear placement position (f) and two-axis placement position (g) are evenly arranged on the tray body. The structures of the first shaft gear placement position (a), the first shaft speed distribution gear placement position (b), the second shaft first gear placement position (c), the second shaft second gear placement position (d), the second shaft third gear placement position (e), and the second shaft reverse gear placement position (f) are the same. They are all Y-shaped support frames. The Y-shaped end of the support frame extends upward with a limiting protrusion. A Y-shaped support block extends upward from the top center of the support frame. A fixing screw is provided at the bottom center of the support frame. The dual-axis placement position (g) is located at one corner of the pallet body (h), including an upper limit plate and a lower limit plate arranged in parallel. The upper limit plate and the lower limit plate are connected and penetrated by four long screws. The center of the upper limit plate and the lower limit plate are both provided with vertical mounting holes, and a cylinder is interference-fitted between the two mounting holes.

3. The automatic transmission main shaft assembly parts picking and scheduling logistics method according to claim 1 or 2, characterized in that, A loading AGV (17) is installed at the receiving end of the picking station conveyor line (22), and a unloading AGV (18) is installed at the unloading end.

4. The automatic transmission main shaft assembly parts picking and scheduling logistics method according to claim 1 or 2, characterized in that, A temporary storage position (21) for emptying is provided at the left end of the gear placement area of ​​the picking area (3); A picking temporary storage position (5) is set at the left end of the gear placement area of ​​the spare material area (2).

5. The automatic transmission main shaft assembly parts picking and scheduling logistics method according to claim 1 or 2, characterized in that, Next to the standby position of the standby material area (2), an automated storage and retrieval system (1) is set up; and an outbound RGV (4) is set up perpendicular to the automated storage and retrieval system (1), the standby material area (2), the picking area (3), the robot work area and the picking station conveyor line (22).

6. The automatic transmission main shaft assembly parts picking and scheduling logistics method according to claim 1 or 2, characterized in that, Also includes: Empty workstation equipment return process: Each time the robot picks a layer of material, it grabs the empty workstation equipment and places it in the picking area (2). The adjacent empty frame placement area matched by each physical placement area is stacked. When the picking system records that the number of stacked layers in the empty frame placement area reaches the maximum value, it requests the WCS system to move the empty frame from the 05 empty frame area to the 06 empty frame placement area. The positions correspond one by one. The WCS system requests the WMS to issue an empty frame warehouse entry task. After the WMS verifies that the empty frame information is accurate, it issues a warehouse transfer task. The WCS receives the task and schedules the picking RGV (6) to transfer the empty frame to the 06 empty frame placement area. Then the WMS continues to issue an empty frame return to the automated warehouse (1) task. The WCS receives the task and schedules the picking RGV (6) again to place the stacked empty workstation equipment in the 06 empty frame placement area into the return empty temporary storage position (21). Subsequently, the WCS continues to schedule the outbound RGV (4) to put the empty workstation equipment back into the automated warehouse (1). Surplus material return process: If the picking system detects that all materials required by the work order have been picked in the picking area (3) 05 physical placement location, and there are still remaining materials, the return process is triggered: the picking system compares whether the next work order still needs the remaining materials in the current picking area (3) 05 physical placement location. If so, picking continues. If the work order switches and no longer needs this type of material, the picking system sends a return request to WCS. WCS requests WMS to issue a return task. After receiving the task, WCS schedules the picking RGV (6) to transport the remaining materials directly from location 05 to the empty temporary storage location (21). After the task is completed, WMS deducts the corresponding picking area (3) 05 location account.

7. The automatic transmission main shaft assembly parts picking and scheduling logistics method according to claim 1 or 2, characterized in that, In the picking process, the workstations are divided into a barcode scanning station, workstation 1, buffer station 1, buffer station 2 and workstation 2 from left to right; half of the picking parts are picked by robot 1 (19) at workstation 1, and the other half of the picking parts are picked by robot 2 (20) at workstation 2; the picking process of this scheme is as follows: after the barcode scanning station scans the QR code of the loading pallet of the one-axis and two-axis sorting unit, the information is uploaded to the WCS and WMS systems and the pallet number is recorded; after recording, the loading pallet of the one-axis and two-axis sorting unit flows into workstation 1, the limiting mechanism lifts up and jams the pallet, and robot 1 (19) starts picking; after picking is completed, the limiting mechanism of workstation 1 is lowered, and the loading pallet of the one-axis and two-axis sorting unit moves to workstation 2; ① At this time, as long as the photoelectric detection of buffer position 1, buffer position 2 and working position 2 is empty, the second robot (20) will immediately execute the picking task of the pallet. The action is performed in advance on the way from the first and second axis sorting unit to the working position 2. When the first and second axis sorting unit arrives at the working position 2, the second robot (20) has already prepared the first part to be picked and put it into place. ② If the photoelectric detection at workstation 2 indicates that there is goods, it means that there is a pallet being picked at workstation 2. Then, after the current first and second axis sorting unit's loading pallet reaches the buffer position 2, it stops and waits. After the first and second axis sorting unit's loading pallet at workstation 2 completes the picking, the current first and second axis sorting unit's loading pallet moves to workstation 2. After the movement is triggered, the second robot (20) also performs the action in advance. When the first and second axis sorting unit's loading pallet reaches workstation 2, the second robot (20) has already prepared the first part to be picked and put it into place. ③ If both workstation 2 and buffer station 2 have photoelectric detection indicating that there is goods, then the loading pallets of the first and second axis sorting units will wait in line at buffer station 1.

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