A method of producing a stream transfer

Abstract

The present application relates to a kind of production logistics transfer methods, which is based on a kind of production logistics transfer system implementation, containing discharge, transportation, feeding three operation processes;The production logistics transfer system contains the track type heavy child car transport device of being arranged in all production workshops (101) inside enterprise and connecting different production workshops (101), control center, distribution in each process point (102) field control console;The discharge of all production workshops (101), all production process points (102), transportation, feeding, are monitored and scheduled by control center.The present application is applicable to the transportation of heavy industry enterprise heavy material, degree of automation is high, transportation efficiency is high, occupies small, can cross workshop transportation, degree of intellectualization is high.

Description

TECHNICAL FIELD

[0001] The present application relates to a production logistics transfer method, belonging to the technical field of production material transportation. BACKGROUND

[0002] Production logistics refers to the entire process of logistics activities from the procurement of raw materials, parts and other auxiliary materials to the processing of work-in-process, semi-finished products and other production procedures, and the finished products entering the warehouse. Therefore, production logistics is synchronized with the production process. After raw materials, purchased parts and other inputs are put into production, they are transported to various processing points and storage points in the form of semi-finished products, flow from one production unit (or warehouse) to another, processed and stored according to the specified process, and transported within a certain point by means of certain transportation devices. The process of transferring from one point to another always embodies the process of transferring materials in physical form. There are many existing transportation devices and methods for production materials. Different transportation devices and methods are used according to the characteristics of the materials, such as spiral transportation, pipeline transportation, conveyor belt transportation, overhead crane transportation, and rail transportation.

[0003] Currently, some production enterprises in certain industries have applied rail-type child-mother car transportation systems to improve the efficiency of production logistics. However, the existing rail-type child-mother car transportation systems have insufficient carrying capacity and cannot transport heavy materials, so traditional overhead crane transportation systems are still used in heavy industrial enterprises that involve heavy materials. For heavy materials involved in the production of heavy industrial enterprises such as metal processing industries, such as several tons to several dozen tons of metal coils and rollers, manual control overhead crane hoisting transportation is still used due to the heavy weight of the materials. Overhead crane transportation has many problems: first, it can only be operated manually and requires synchronous cooperation between the lifting and falling material auxiliary control and the overhead crane operator, which is difficult to operate and the material falling position is not accurate, making it difficult to control the hoisting and transportation of heavy objects and unable to achieve automatic control; second, it can only be operated within the same span workshop and cannot be used for inter-span transportation; third, it cannot reach the corner positions of the workshop and has dead angles in transportation, resulting in low space utilization of the workshop and cannot be applied to irregularly laid workshops; fourth, the number of overhead cranes installed in the same span workshop is limited and cannot meet multiple material transportation requirements at the same time, such as seamless connection of front and rear material taking, multiple process points requiring material feeding or discharging, etc., resulting in low production logistics transportation efficiency; fifth, the hoisting and lowering of heavy objects requires a lot of energy consumption; sixth, it cannot adapt to the production rhythm of modern automated and intelligent production.

[0004] Chinese patent CN206956469U discloses a child-mother car rail transfer device that can cover the entire workshop production site through flat car combination and rail network. Due to the use of rail transportation, the friction is small, the manual trolley is free and convenient, the power consumption is saved, and a power mechanism can also be installed. It can also

[0005] The remote control device is configured to realize automatic transfer, and a rotating platform is arranged to link the dry tracks with each other, and the dry tracks can be transferred between each other. The technical scheme can partially solve the first, third, fourth and fifth problems in the overhead crane transportation system, but still cannot cross the bay transportation, needs manual participation, the automation degree is not high, and the technical scheme is not provided for whether the heavy material can be carried or not, so the modern intelligent logistics transfer system cannot be applied to the heavy industrial enterprises.

[0006] Therefore, the current production logistics status of the overhead crane transporting heavy materials seriously hinders the development process of the heavy industrial enterprises to the automation production and intelligent production, and an automatic control, high transportation efficiency, small space occupation, cross-bay transportation and high intelligent degree modern logistics transfer system for the heavy industrial enterprises is urgently needed. SUMMARY

[0007] The purpose of the present application is to overcome the above-mentioned deficiencies, and to provide a production logistics transfer method suitable for heavy materials in heavy industrial enterprises, with high automation degree, high transportation efficiency, small space occupation, cross-bay transportation and high intelligent degree.

[0008] The purpose of the present application is achieved as follows:

[0009] A production logistics transfer method is realized based on a production logistics transfer system, the production logistics transfer system comprises a track type heavy child-mother vehicle transportation device arranged in all production bays of an enterprise and connecting different production bays, a control center and a field control console distributed at each process point; the production logistics transfer method comprises the following contents:

[0010] I, discharging: 1.1, when the material at any process point needs to be discharged, the field control console at the process point submits a discharge request to the control center; 1.2, the control center allocates the idle mother vehicle closest to the process point from the mother vehicle track of the track type heavy child-mother vehicle transportation device to the child vehicle track at the discharge port of the process point; 1.3, the child vehicle drives into the child vehicle track from the mother vehicle, and loads the material at the process point and returns to the mother vehicle;

[0011] II, transportation: 2.1, the control center informs the destination process point of the mother vehicle transportation according to the material loaded by the child vehicle, and sends the driving path to the mother vehicle; 2.2, after receiving the destination and driving path sent by the control center, the mother vehicle transports the child vehicle and the material to the destination process point according to the planned path;

[0012] III, feeding: 3.1, the mother car will carry the material to the sub-car track at the feeding port of the target process point, and send a feeding in place signal to the control center; 3.2, the control center sends the material in place notification to the on-site control console of the target process point; 3.3, the on-site control console sends the feeding permission to the control center; 3.4, the control center sends the feeding signal to the mother car; 3.5, the sub-car drives into the sub-car track at the feeding port of the target process point from the mother car, and unloads the material to the process point.

[0013] The control center monitors and dispatches the discharging, transportation and feeding of all production workshops and all production process points of the enterprise.

[0014] Further, the track type heavy sub-mother car transportation device comprises a plurality of mother car tracks arranged inside and outside each production workshop and connected with each other, and a plurality of sub-car tracks arranged between the mother car tracks and each production process point; the mother car track and the sub-car track each comprise two parallel arranged steel rails, which are fixed on the foundation through embedded bolts, nuts and rail pressing plates; a reversing mechanism for changing the mother car track of the mother car is arranged at the intersection position between different mother car tracks; a plurality of mother cars are arranged to drive on the mother car track, and a parking track for the sub-car to drive and park is arranged on the mother car, the parking track and the sub-car track are in the same horizontal plane and are aligned with each other; the sub-car moves back and forth on the parking track of the mother car and the sub-car track.

[0015] Further, the reversing mechanism comprises a rotating table rotatably arranged on the foundation, and a rotating track arranged on the rotating table and connected with the mother car track; the rotating table is rotatably arranged on the base fixed on the ground through the annular ball bearing, and an annular gear is arranged on the outer circle of the rotating table, which is meshed and driven with the reduction gear driven by the motor arranged on the base.

[0016] Further, a cable trench is arranged in the mother car track, and a slide wire is arranged in the cable trench; a slide contact part is arranged at the bottom of the mother car frame, which is in sliding contact with the slide wire to obtain power and transmit signals; a position signal sensor is arranged on the mother car to feed back real-time position information.

[0017] Further, at least four groups of left and right symmetrical wheels are arranged on the bottom of the mother car and the sub-car, which are arranged on the steel rails, wherein the first group and the last group of wheels are driving wheels connected with the motor arranged on the mother car or the sub-car, and the middle two groups of wheels are supporting wheels.

[0018] Further, a cable is connected between the mother car and the sub-car to transmit power and signals.

[0019] Furthermore, saddles for supporting materials are provided on both sides of the sub-trolley track; a transition device is also provided between the sub-trolley track and the production process point for loading or unloading materials between the sub-trolley on the sub-trolley track and the production process point.

[0020] Furthermore, the transition device includes a transition track in the same direction as the sub-vehicle track, and a transition frame arranged on the transition track through wheel sliding; the transition frame is controlled by a horizontal cylinder to move horizontally on the transition track, and a bracket for supporting materials is set inside the transition frame by a lifting cylinder.

[0021] Furthermore, the mother vehicle track is provided with a flap or an arch bridge for vehicles or pedestrians; the arch bridge comprises half bridge decks symmetrically arranged on both sides of the mother vehicle track and driven to open and close by pneumatic panels.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention adopts a rail-type heavy-duty trolley transport device, a load-bearing steel rail, and a frame-type trolley, which has a large load capacity and can transport heavy materials, and is suitable for material transportation in heavy industrial enterprises;

[0024] The mother vehicle track of the present invention is arranged inside and outside the production workshop and is interconnected, connecting the logistics channels of different production workshops, so that the production logistics transfer is no longer restricted by the plane shape of the workshop and the special layout of different workshops, takes up little space, and can be transported across workshops;

[0025] The present invention independently transfers logistics for the discharge, transportation and feeding of production logistics at each production process point through information transmission and behavior control between the control center, on-site control console and mother-and-child vehicles of the production logistics transfer system, and the control center coordinates and controls the material transfer of all process points, thereby realizing automated and intelligent material transfer and improving material transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a working principle diagram of a production logistics transfer method of the present invention.

[0027] Figure 2 This is a plan layout diagram of a rail-type heavy-duty mother-and-child vehicle transport device for a production logistics transfer method of the present invention.

[0028] Figure 3 This is a schematic diagram of the rail installation structure of a production logistics transfer method of the present invention.

[0029] Figure 4 This is a plan layout diagram of the reversing mechanism of a production logistics transfer method of the present invention.

[0030] Figure 5A lateral sectional view of a reversing mechanism for a production logistics transfer method of the present application.

[0031] Figure 6 A lateral partial enlarged view of a reversing mechanism for a production logistics transfer method of the present application.

[0032] Figure 7 A top view of a working state of a mother-daughter vehicle for a production logistics transfer method of the present application.

[0033] Figure 8 A front view of a working state of a mother-daughter vehicle for a production logistics transfer method of the present application.

[0034] Figure 9 A front view of a transition device for a production logistics transfer method of the present application.

[0035] Figure 10 A right view of a transition device for a production logistics transfer method of the present application.

[0036] Figure 11 An arch bridge structure schematic diagram for a production logistics transfer method of the present application.

[0037] Wherein:

[0038] Production workshop 101, process point 102;

[0039] Mother vehicle track 1, daughter vehicle track 2, mother vehicle 3, daughter vehicle 4, reversing mechanism 5;

[0040] Steel rail 11, embedded bolt 12, nut 13, track pressing plate 14, cable trench 15, slide wire 16, arch bridge 17, pneumatic panel 18, half bridge surface 19;

[0041] Saddle 21, transition track 22, transition vehicle frame 23, horizontal oil cylinder 24, lifting oil cylinder 25, bracket 26;

[0042] Parking track 31, cable drum 32, wire supporting roller 33;

[0043] Rotary table 51, rotary track 52, annular ball bearing 53, base 54, annular gear 55. DETAILED DESCRIPTION

[0044] Referring to Figures 1-11The application relates to a production logistics transfer method, wherein the production logistics refers to logistics activities in a production process, generally refers to raw materials, purchased parts and other inputs into production, which are transferred to various processing points and storage points in the form of work-in-process, flow into another production unit from one production unit, are processed and stored according to a specified process, and flow in and out of a certain point by means of certain transportation devices, and always embody the flow process of the material in the form of real objects.

[0045] The production logistics transfer method is realized based on a production logistics transfer system; the production logistics transfer system comprises track type heavy mother-son car transportation devices arranged in all production workshops 101 of an enterprise and connecting different production workshops 101, a control center and on-site control consoles distributed at each process point 102; the track type heavy mother-son car transportation devices comprise multiple mother car tracks 1 arranged in each production workshop 101 and connected with each other and multiple son car tracks 2 arranged between the mother car tracks 1 and each production process point 102; the mother car tracks 1 and the son car tracks 2 each comprise two parallel arranged steel rails 11, the steel rails 11 are fixed on the foundation through embedded bolts 12, nuts 13 and track pressing plates 14, specifically, the track pressing plates 14 lock and fix the steel rails 11 through the nuts 13 screwed on the embedded bolts 12, and the track design structure is one of the key conditions that the mother-son car transportation devices can bear materials with a weight of dozens of tons;

[0046] The tracks of the track type heavy mother-son car transportation devices connected with each other are not influenced by the plane layout of the workshops and the plane layout positions of the workshops in the factory building; the tracks can reach the corner positions of the workshops, the transportation has no dead angle, the space utilization rate of the workshops is improved, and the track type heavy mother-son car transportation devices can be applied to the factory buildings with irregular plane layouts, so that the factory buildings without traditional overhead crane systems can be used as normal production workshops, and the utilization rate of the factory building is improved.

[0047] The reversing mechanism 5 is arranged at the intersection between different mother vehicle tracks 1 for changing the mother vehicle track 1 of the mother vehicle 3; the reversing mechanism 5 comprises a rotating table 51 rotatably arranged on the ground, and a rotating track 52 arranged on the rotating table 51 and connected with the mother vehicle track 1; the rotating table 51 is rotatably arranged on a base 54 fixed on the ground through an annular ball bearing 53, and an annular gear 55 is arranged on the outer circle of the rotating table 51 and engaged with a speed reduction gear driven by a motor arranged on the base 54; since there is a gap between the rotating track 52 and the mother vehicle track 1, in order to ensure that the mother vehicle 3 carrying the heavy material carrying vehicle 4 can smoothly pass through the gap, at least four groups of wheels are arranged on the bottom of the frame of the mother vehicle 3 in the forward direction and symmetrically arranged on the steel rail 11, wherein the first group and the last group of wheels are connected with the motor arranged on the mother vehicle 3 as driving wheels, and the middle two groups of wheels are support wheels; the design of the four groups of wheels of the mother vehicle 3 can prevent the three groups of wheels of the mother vehicle from being always supported on the track and always having a group of driving wheels providing driving force on the track when encountering the gap of the track connection;

[0048] The mother vehicle 3 is arranged on the mother vehicle track 1, and the stopping track 31 is arranged on the mother vehicle 3 for facilitating the movement and stopping of the vehicle 4; the stopping track 31 and the vehicle track 2 are in the same horizontal plane and are aligned and connected with each other; the vehicle 4 moves back and forth on the stopping track 31 of the mother vehicle 3 and the vehicle track 2; since there is a gap between the stopping track 31 and the vehicle track 2, in order to ensure that the vehicle 4 carrying heavy materials can smoothly pass through the gap, at least four groups of wheels are arranged on the bottom of the frame of the vehicle 4 in the forward direction and symmetrically arranged on the steel rail 11, wherein the first group and the last group of wheels are connected with the motor arranged on the vehicle 4 as driving wheels, and the middle two groups of wheels are support wheels; like the mother vehicle 3, the design of the four groups of wheels of the vehicle 4 can prevent the three groups of wheels of the vehicle from being always supported on the track and always having a group of driving wheels providing driving force on the track when encountering the gap of the track connection;

[0049] The two sides of the sub-car track 2 are provided with saddles 21 for supporting materials, for temporarily storing materials; a transition device is further provided between the sub-car track 2 and the production process point 102, for loading or unloading materials between the sub-car 4 on the sub-car track 2 and the production process point 102; the transition device comprises a transition track 22 in the same direction as the sub-car track 2, a transition carriage 23 provided on the transition track 22 through wheel sliding; the transition carriage 23 is controlled by a horizontal oil cylinder 24 to translate on the transition track 22, and a bracket 26 for supporting materials is provided inside the transition carriage 23 through a lifting oil cylinder 25; when the sub-car 4 delivers materials to the process point 102, the horizontal oil cylinder 24 of the transition device controls the transition carriage 23 to translate along the transition track 22 to the position of the saddle 21 of the sub-car track 2; the lifting oil cylinder 25 pushes the bracket 26 to rise to lift the materials on the sub-car 4; the horizontal oil cylinder 24 controls the transition carriage 23 to pull the materials into the process point 102 for production and processing; when the process point 102 needs to be accessed at the same time, or other reasons make the sub-car 4 and the transition device cannot synchronize the transfer of materials, the sub-car 4 can first place the materials on the saddle 21 beside the sub-car track 2, and then take the materials from the saddle 21 when the transition device is idle, so that the sub-car 4 does not need to stay and wait, providing transfer efficiency;

[0050] Based on the above production logistics transfer system, the production logistics transfer method comprises the following contents:

[0051] I, discharging: 1.1, when the materials of any process point 102 need to be discharged, the on-site console at the process point 102 submits a discharge request to the control center; 1.2, the control center allocates the closest idle mother car 3 from the mother car track 1 to the sub-car track at the discharge port of the process point 102; 1.3, the sub-car 4 drives into the sub-car track 2 from the mother car 3, loads the materials of the process point 102, and returns to the mother car 3; the transition device at the process point 102 transports the materials out of the process point 102, and can be placed on the saddle 21 or directly placed on the sub-car 4 according to whether the sub-car 4 is idle; the sub-car 4 drives into the sub-car track 2 from the mother car 3, and returns to the mother car 3 after taking the materials from the transition device or the saddle 21;

[0052] II、Transportation: 2.1, the control center informs the mother car 3 of the material loading of the child car 4 and sends the driving path to the mother car 3; 2.2, after receiving the destination and driving path sent by the control center, the mother car 3 transports the child car 4 and the material to the destination process point 102 through the mother car track 1 according to the planned path; during the driving process, when the mother car 3 needs to change the mother car track 1, the mother car 3 enters the rotating table 51 of the reversing mechanism 5, the motor driving ring gear 55 on the base 54 of the reversing mechanism 5 rotates, the rotating table 51 drives the mother car 3 to turn to the destination mother car track 1, and the four groups of wheels of the mother car 3 enter the mother car track 1 to continue driving after passing through the gap between the rotating track 52 and the mother car track 1;

[0053] III, feeding: 3.1, the mother car 3 sends the child car 4 carrying the material to the child car track 2 at the feeding port of the destination process point 102, and sends a feeding in-place signal to the control center; 3.2, the control center sends a material in-place notification to the on-site console of the destination process point 102; 3.3, the on-site console sends a feeding permission to the control center; 3.4, the control center sends a feeding signal to the mother car 3; 3.5, the child car 4 drives into the child car track 2 at the feeding port of the destination process point 102 from the mother car 3, and unloads the material to the process point 102.

[0054] In the past, when people studied production activities, they mainly focused on one after another production and processing processes, and often ignored the logistics activities that connected each production and processing process and appeared at the same time as each production and processing process. For example, constantly leaving the previous process and entering the next process will constantly occur logistics activities such as moving up and down, moving forward, and temporarily stopping. In fact, in a production cycle, the time used for logistics activities is much longer than the actual processing time. Therefore, the potential of enterprise production logistics research, the potential of time saving, and the potential of labor saving are very large. The present application enables each process of material in and out and transportation to be independently operated and not to affect each other, shortens the time used for overall logistics activities, and improves logistics efficiency.

[0055] The control center monitors and schedules the discharge, transportation and feeding of all production workshops 101 and all production process points 102 of the enterprise; the mother vehicle 3, the child vehicle 4 and the field control console are connected with the control center by electric signals; specifically, a cable trench 15 is arranged in the mother vehicle track 1, and a slide contact line 16 is arranged in the cable trench 15; the bottom of the frame of the mother vehicle 3 is provided with a slide contact part which is in sliding contact with the slide contact line 16 to obtain power and transmission signals; a position signal sensor is installed on the mother vehicle 3 to feed back real-time position information; a cable is connected between the mother vehicle 3 and the child vehicle 4 to transmit power and signals; specifically, a cable drum 32 is arranged on the mother vehicle 3, and the cable of the cable drum 32 is connected with the child vehicle 4; when the child vehicle 4 enters the child vehicle track 2 and leaves the mother vehicle 3, the cable drum 32 releases the cable, and vice versa, the cable is tightened; in order to prevent the cable from being damaged by friction on the ground, a wire supporting roller 33 is further arranged on the frame of the mother vehicle 3 to support the cable;

[0056] The basic work of production logistics is to transport and deliver the materials required for production to the site and each process work center on time, in quantity, without error according to the instructions of the material demand plan. An important feature of modern material handling is to consider and comprehensively arrange the material handling as a whole logistics system together with the related processes and sites such as processing, assembly, packaging and inspection. The entire logistics process of a heavy material enterprise such as a machinery factory or a metal processing factory contains extensive and heavy material handling operations, forming a more complex in-plant logistics system than other industry factories. It is not only an important part of production, but also an indispensable information source for enterprise management. Mastering the logistics information can help to improve enterprise management and improve economic efficiency by timely understanding the variety, quantity, quality, location, production progress, capital turnover and existing problems of raw materials, parts and products;

[0057] Therefore, the control center monitors, schedules and overall manages all logistics information in the enterprise, and if the Internet and cloud functions are used, the logistics management of the subsidiaries in different regions can be arranged together, and truly automated and integrated logistics is realized, which provides a solid foundation for the subsequent introduction of AI intelligent logistics management system to form intelligent logistics.

[0058] In addition, since a plurality of longitudinal and transverse intersecting tracks are arranged in the enterprise factory building, in order not to affect the movement of vehicles and pedestrians inside and outside the production workshop 101, a flip plate or an arch bridge 17 is arranged on the mother vehicle track 1 for vehicles or pedestrians; the flip plate is driven by an oil cylinder to cover a whole steel plate on the track for vehicle walking, the flip plate is opened for the mother vehicle to pass through, and a red and green light signal marker rod is also arranged to facilitate crossing; the arch bridge 17 includes two symmetrical half bridge surfaces 19 arranged on both sides of the mother vehicle track 1 and driven by a pneumatic panel 18 to open and close, and when the two half bridge surfaces 19 are closed and folded, a bridge surface for pedestrians to walk is formed.

[0059] In addition, it should be noted that the above detailed description is only one of the optimization schemes of the patent, and any changes or improvements made by those skilled in the art based on the above idea are within the protection scope of the patent.

Claims

1. A production logistics transfer method, characterized in that: it is implemented based on a production logistics transfer system, the production logistics transfer system comprising a rail-type heavy-duty mother-and-child vehicle transport device arranged inside all production workshops (101) of the enterprise and connecting different production workshops (101), a control center, and a field control console distributed at each process point (102); the production logistics transfer method comprises the following contents: I. Discharging: 1.

1. When materials at any process point (102) need to be discharged, the on-site control console at that process point (102) submits a discharge request to the control center; 1.

2. The control center dispatches the nearest idle mother car (3) from the mother car track (1) of the rail-type heavy-duty mother-and-child transport device to the child car track at the material outlet of the process point (102); 1.

3. The child car (4) drives from the mother car (3) onto the child car track (2), loads the material at the process point (102) and returns to the mother car (3); II. Transportation: 2.

1. The control center notifies the mother vehicle (3) of the destination process point (102) based on the material loaded on the sub-vehicle (4) and sends the mother vehicle (3) a travel route; 2.

2. After receiving the destination and travel route from the control center, the mother vehicle (3) transports the sub-vehicle and the material to the destination process point (102) via the mother vehicle track (1) according to the planned route; III. Feeding: 3.

1. The mother car (3) delivers the sub-cart (4) loaded with materials to the sub-cart track (2) at the feed port of the destination process point (102), and simultaneously sends a feed-in position signal to the control center; 3.

2. The control center sends a material-in-position notification to the on-site control console at the destination process point (102); 3.

3. The on-site control console sends a feed permission to the control center; 3.

4. The control center sends a feed signal to the mother car (3); 3.

5. The sub-cart (4) drives from the mother car (3) to the sub-cart track (2) at the feed port of the destination process point (102), and unloads the materials to the process point (102); The discharge, transportation and feeding of all production workshops (101) and all production process points (102) of the enterprise are monitored and dispatched by the control center.

2. The production logistics transfer method according to claim 1, characterized in that: The rail-type heavy-duty mother-and-child vehicle transport device comprises a plurality of mother vehicle tracks (1) arranged inside and outside each production workshop (101) and interconnected, and a plurality of child vehicle tracks (2) arranged between the mother vehicle tracks (1) and each production process point (102); the mother vehicle tracks (1) and the child vehicle tracks (2) each comprise two parallel steel rails (11), and the steel rails (11) are fixed on the foundation by embedded bolts (12), nuts (13) and rail pressure plates (14); A reversing mechanism (5) for a mother vehicle (3) to change the mother vehicle track (1) is provided at an intersection with the mother vehicle track (1); a plurality of mother vehicles (3) are arranged on the mother vehicle track (1); the mother vehicle (3) is provided with a parking track (31) for facilitating the parking of a child vehicle (4); the parking track (31) and the child vehicle track (2) are in the same horizontal plane and are aligned and connected with each other; the child vehicle (4) moves back and forth on the parking track (31) of the mother vehicle (3) and the child vehicle track (2).

3. The production logistics transfer method according to claim 2, characterized in that: The reversing mechanism (5) comprises a rotating platform (51) rotatably arranged on a foundation, and a rotating track (52) connected to the mother vehicle track (1) is provided on the rotating platform (51); the rotating platform (51) is rotatably arranged on a base (54) fixed on the ground through an annular ball bearing (53), and a ring gear (55) is provided on the outer circle of the rotating platform (51), which is engaged with a reduction gear driven by a motor and arranged on the base (54) for transmission.

4. The production logistics transfer method according to claim 1, characterized in that: A cable trench (15) is provided in the mother vehicle track (1), and a busbar (16) is provided in the cable trench (15); a sliding contact portion is provided at the bottom of the mother vehicle (3) frame, which is in sliding contact with the busbar (16) to obtain power and transmit signals; a position signal sensor is installed on the mother vehicle (3) to feed back real-time position information.

5. The production logistics transfer method according to claim 1, characterized in that: The bottom of each of the mother vehicle (3) and the sub-vehicle (4) is provided with at least four groups of wheels symmetrically mounted on the rails (11), wherein the first and last groups of wheels are connected to the motors provided on the mother vehicle (3) or the sub-vehicle (4) and serve as driving wheels, and the middle two groups of wheels serve as supporting wheels.

6. The production logistics transfer method according to claim 1, characterized in that: A cable is connected between the mother vehicle (3) and the daughter vehicle (4) to transmit power and signals.

7. The production logistics transfer method according to claim 1, characterized in that: Saddles (21) for supporting materials are provided on both sides of the sub-trolley track (2); a transition device is also provided between the sub-trolley track (2) and the production process point (102) for loading or unloading materials between the sub-trolley (4) on the sub-trolley track (2) and the production process point (102).

8. The production logistics transfer method according to claim 7, characterized in that: The transition device comprises a transition track (22) in the same direction as the sub-trolley track (2), and a transition frame (23) arranged on the transition track (22) by wheel sliding; the transition frame (23) is controlled to move horizontally on the transition track (22) by a horizontal cylinder (24), and a bracket (26) for supporting materials is raised and lowered inside the transition frame (23) by a lifting cylinder (25).

9. The production logistics transfer method according to claim 1, characterized in that: The mother vehicle track (1) is provided with a flap or an arch bridge (17) for vehicles or pedestrians; the arch bridge (17) comprises a half bridge deck (19) symmetrically arranged on both sides of the mother vehicle track (1) and driven to open and close by a pneumatic panel (18).

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