Automatic material conveying system and automatic feeding method for engine preassembling line

Abstract

The invention relates to an engine preassembling line material automatic conveying system and an automatic feeding method, the system comprises at least one integrated material vehicle and at least one line side product rack, and the integrated material vehicle comprises a material box loading layer, a material loading layer and an empty material box recovery layer which are sequentially arranged from top to bottom; the line edge product frame comprises a material box temporary storage layer and an empty material box temporary storage layer which are sequentially arranged from top to bottom, the material boxes are located on the material box loading layer, and the empty material boxes are located on the empty material box temporary storage layer. The material box loading layer, the material box temporary storage layer, the material loading layer, the empty material box temporary storage layer and the empty material box recovery layer are sequentially arranged from top to bottom. The technical problems that in the prior art, the process is single, and feeding of material boxes and recycling of empty material boxes are difficult to achieve at the same time are solved.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, specifically to an automatic material conveying system and automatic feeding method for engine pre-assembly lines. Background Technology

[0002] In the field of automotive engine pre-assembly lines, the efficient, accurate, and automated delivery of materials to various assembly stations directly determines the production line's operating cycle time, personnel allocation, and overall manufacturing costs. Achieving seamless logistics from the warehouse to the line and then to the operators at the assembly stations is a key aspect of improving the automation and intelligence level of production lines. Currently, the industry has mainly evolved several technical approaches to achieve this goal: First, there are material handling systems based on Automated Guided Vehicles (AGVs), which solve the problem of movement from point to area; second, there are loading and unloading systems combined with specialized robotic arms or gripping mechanisms, which aim to simulate and replace manual picking and placing actions; and third, there are the design of specific tracks and pushing mechanisms to transfer materials from transport vehicles to fixed assembly stations. These methods all promote automation at specific levels.

[0003] In existing technologies, most solutions typically focus only on how to deliver materials, while neglecting the equally important reverse logistics requirement of how to simultaneously recycle empty containers. This prevents the complete material cycle from being closed within a compact process, thus hindering further improvements in overall efficiency. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an automatic material conveying system and automatic feeding method for engine pre-assembly lines, which aims to solve the technical problems in the prior art, such as the single process and the difficulty in simultaneously handling the feeding of material boxes and the recycling of empty material boxes.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: An automated material conveying system for an engine pre-assembly line includes at least one integrated material cart and at least one line-side product rack. The integrated material cart includes, from top to bottom, a material box loading layer, a material loading layer, and an empty material box recycling layer. The line-side product rack includes, from top to bottom, a material box temporary storage layer and an empty material box temporary storage layer. The material box loading layer is used to load material boxes, and the empty material box temporary storage layer is used to load empty material boxes. When an integrated material cart is aligned and fitted with a line-side product rack, the material box loading layer, the material box temporary storage layer, the material loading layer, the empty material box temporary storage layer, and the empty material box temporary storage layer are... The box recycling layers are arranged sequentially from top to bottom. Several first glass bearings are arranged on the bearing surfaces of both the material box loading layer and the empty material box recycling layer. A first transverse guide rod is arranged between the empty material box temporary storage layer and the material loading layer. Several second glass bearings are arranged on the bearing surfaces of both the material box temporary storage layer and the empty material box temporary storage layer. The material box temporary storage layer is equipped with a guide rod lifting mechanism. One end of the guide rod lifting mechanism is connected to the material box temporary storage layer, and the end of the guide rod lifting mechanism away from the material box temporary storage layer is connected to a second transverse guide rod. The second transverse guide rod is located on the side of the material box loading layer opposite to the material box temporary storage layer.

[0006] Furthermore, the material loading layer is provided with several grid-type material boxes.

[0007] Furthermore, the guide rod lifting mechanism includes a material guide descent bearing and a drive assembly. The line-side product rack includes a fixed column. One end of the material box temporary storage layer and the empty material box temporary storage layer are both connected to the fixed column. One side of the fixed column is recessed to form a receiving groove. The two opposite ends of the drive assembly are respectively connected to the bottom of the receiving groove and the material guide descent bearing. The end of the material guide descent bearing away from the drive assembly is connected to the second transverse guide rod. The drive assembly is used to drive the material guide descent bearing to move in the vertical direction.

[0008] Furthermore, a guide rail is provided on one side of the integrated material cart, and the extension direction of the guide rail is parallel to the travel path of the integrated material cart.

[0009] Furthermore, the automatic material conveying system for the engine pre-assembly line also includes a pre-assembly line area, which has several assembly stations, and some of the assembly stations are equipped with the line-side product racks.

[0010] Furthermore, the automatic material conveying system for the engine pre-assembly line also includes a material replenishment area, a production line control area, and a queue loading area. A PLC control console is installed in the production line control area, and sensor components are installed in the material replenishment area, the production line control area, the queue loading area, the line-side product rack, and the integrated material cart.

[0011] Furthermore, the integrated material cart is equipped with an AGV drive control unit, and the PLC console is connected to the sensor assembly, the AGV drive control unit, and the guide rod lifting mechanism via a communication network.

[0012] Furthermore, the sensor assembly includes a position sensor and a weight sensor. The position sensor is used to collect position information, and the weight sensor is used to collect weight information. The PLC control console is used to determine whether the integrated material cart needs to return to the material replenishment area based on the collected position and weight information.

[0013] An automatic material feeding method for an engine pre-assembly line, used to control the aforementioned automatic material conveying system for an engine pre-assembly line, includes the following steps: S1, Align and attach the integrated material cart with the line-side product rack so that the material box loading layer, material loading layer, and empty material box recycling layer of the integrated material cart are sequentially adjacent to the material box temporary storage layer and empty material box temporary storage layer of the line-side product rack in the vertical direction. S2, control the guide rod lifting mechanism so that the second transverse guide rod is in a preset interception position; S3, control the movement of the integrated material cart, the material box on the material box loading layer is intercepted by the second transverse guide rod and rolls on the first glass bearing, so that the material box is transferred to the material box temporary storage layer. At the same time, the empty material box on the empty material box temporary storage layer is intercepted by the first transverse guide rod and rolls on the second glass bearing, so that the empty material box is transferred to the empty material box recycling layer.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: through the stacked layout of the integrated material cart and the line-side product rack, and the synergistic effect of the first and second transverse guide rods, the precise delivery of materials and the immediate recycling of empty material boxes are completed simultaneously in one movement, realizing a highly efficient closed loop of material flow and significantly improving work efficiency and automation. At the same time, this solution replaces the complex multi-step sequential control system with a simple and reliable mechanical interaction, reducing equipment costs and failure rates, and enhancing the system's adaptability to different assembly station layouts. Attached Figure Description

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a side view of the integrated material cart and the product rack at the line side in the automatic material conveying system for engine pre-assembly line according to an embodiment of the present invention. Figure 2This is a schematic diagram of the integrated material cart in the automatic material conveying system for engine pre-assembly lines according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the line-side product rack in the automatic material conveying system of the engine pre-assembly line according to an embodiment of the present invention; Figure 4 for Figure 3 Enlarged diagram of point A in the middle.

[0016] Explanation of key component symbols: 1. Integrated material cart; 10. Material box loading layer; 11. Material loading layer; 111. Grid material box; 12. Empty material box recycling layer; 13. AGV drive control unit; 14. First glass bearing; 15. First transverse guide rod; 2. Line-side product rack; 20. Material box temporary storage layer; 21. Empty material box temporary storage layer; 22. Second glass bearing; 230. Second transverse guide rod; 231. Guide rod lifting mechanism; 232. Material guide descent bearing; 233. Drive assembly; 24. Fixed column.

[0017] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0018] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0020] In this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0021] Please see Figures 1 to 4 An automated material conveying system for an engine pre-assembly line includes at least one integrated material cart 1 and at least one line-side product rack 2. The integrated material cart 1 includes, from top to bottom, a material box loading layer 10, a material loading layer 11, and an empty material box recycling layer 12. The line-side product rack 2 includes, from top to bottom, a material box temporary storage layer 20 and an empty material box temporary storage layer 21. The material box loading layer 10 is used to load material boxes, and the empty material box temporary storage layer 21 is used to load empty material boxes. When an integrated material cart 1 and a line-side product rack 2 are aligned and fitted together, the material box loading layer 10, the material box temporary storage layer 20, the material loading layer 11, the empty material box temporary storage layer 21, and the empty material box recycling layer 12 move from top to bottom. The following configurations are arranged sequentially: several first glass bearings 14 are provided on the bearing surfaces of the material box loading layer 10 and the empty material box recycling layer 12; a first transverse guide rod 15 is provided between the empty material box temporary storage layer 21 and the material loading layer 11; several second glass bearings 22 are provided on the bearing surfaces of the material box temporary storage layer 20 and the empty material box temporary storage layer 21; a guide rod lifting mechanism 231 is provided on the material box temporary storage layer 20; one end of the guide rod lifting mechanism 231 is connected to the material box temporary storage layer 20; the end of the guide rod lifting mechanism 231 away from the material box temporary storage layer 20 is connected to a second transverse guide rod 230; and the second transverse guide rod 230 is located on the side of the material box loading layer 10 opposite to the material box temporary storage layer 20.

[0022] The material loading layer 11 is provided with a number of grid material boxes 111.

[0023] The guide rod lifting mechanism 231 includes a material guide lowering bearing 232 and a drive assembly 233. The line-side product rack 2 includes a fixed column 24. One end of the material box temporary storage layer 20 and the empty material box temporary storage layer 21 are both connected to the fixed column 24. One side of the fixed column 24 is recessed to form a receiving groove. The two opposite ends of the drive assembly 233 are respectively connected to the bottom of the receiving groove and the material guide lowering bearing 232. The end of the material guide lowering bearing 232 away from the drive assembly 233 is connected to the second transverse guide rod 230. The drive assembly 233 is used to drive the material guide lowering bearing 232 to move in the vertical direction.

[0024] The integrated material cart 1 has a guide rail on one side, and the extension direction of the guide rail is parallel to the travel path of the integrated material cart 1.

[0025] The automatic material conveying system for the engine pre-assembly line also includes a pre-assembly line area, which has several assembly stations, and some of the assembly stations are equipped with the line-side product rack 2.

[0026] The automatic material conveying system for the engine pre-assembly line also includes a material replenishment area, a production line control area, and a queue loading area. A PLC control console is installed in the production line control area. Sensor components are installed in the material replenishment area, the production line control area, the queue loading area, the line-side product rack 2, and the integrated material cart 1.

[0027] The integrated material cart 1 is equipped with an AGV drive control unit 13. The PLC console is connected to the sensor assembly, the AGV drive control unit 13 and the guide rod lifting mechanism 231 via a communication network.

[0028] The sensor assembly includes a position sensor and a weight sensor. The position sensor is used to collect position information, and the weight sensor is used to collect weight information. The PLC control console is used to determine whether the integrated material cart 1 needs to return to the material replenishment area based on the collected position and weight information.

[0029] An automatic material feeding method for an engine pre-assembly line, used to control the aforementioned automatic material conveying system for an engine pre-assembly line, includes the following steps: S1, align and attach the integrated material cart 1 with the line-side product rack 2 so that the material box loading layer 10, material loading layer 11, and empty material box recycling layer 12 of the integrated material cart 1 are sequentially adjacent to the material box temporary storage layer 20 and empty material box temporary storage layer 21 of the line-side product rack 2 in the vertical direction. S2, control the guide rod lifting mechanism 231 so that the second transverse guide rod 230 is in a preset interception position; S3, control the movement of the integrated material cart 1, the material box on the material box loading layer 10 is intercepted by the second transverse guide rod 230 and rolls on the first glass bearing 14 so that the material box is transferred to the material box temporary storage layer 20. At the same time, the empty material box on the empty material box temporary storage layer 21 is intercepted by the first transverse guide rod 15 and rolls on the second glass bearing 22 so that the empty material box is transferred to the empty material box recycling layer 12.

[0030] Specifically, the workflow of the automatic material conveying system for this engine pre-assembly line is as follows: The system operates within a production line comprising a material replenishment area, a production line control area, a queue loading area, and a pre-assembly line area. The pre-assembly line area has multiple assembly stations arranged sequentially, some of which are adjacent to line-side product racks 2 for receiving and storing empty material boxes. The integrated material cart 1 employs a compact, one-piece design to adapt to limited space on-site.

[0031] I. Task Commencement and Loading In the material replenishment area, operators load materials according to the production plan, using a one-vehicle-to-N-engine configuration: boxes containing heavy materials are placed on the first glass bearing 14 of the box loading layer 10 of the integrated material cart 1; small and medium-sized materials are placed into their respective grid boxes 111 of the material loading layer 11 according to their assembly sequence. The glass bearings are made of wear-resistant materials to ensure smooth sliding of the boxes. After loading is complete, the PLC control console sends a delivery command to the AGV drive control unit 13 of the integrated material cart 1, the drive motor starts, and the integrated material cart 1 travels along the magnetic strip route laid on the ground to the pre-assembly line area.

[0032] 2. Proceed to the assembly station in sequence and begin work. The integrated material cart 1 enters each target assembly station sequentially according to a pre-set order. At each assembly station, the system operates according to the following steps: Vehicle arrival and assembly station identification: When the integrated material cart 1 arrives at the assembly station, the sensors installed at the assembly station, such as position sensors, are triggered and transmit signals back to the PLC control console. The PLC control console determines whether a line-side product rack 2 is installed next to this assembly station based on the pre-stored assembly station layout information.

[0033] For assembly stations where line-side product rack 2 is installed: Alignment: The PLC console controls the AGV drive control unit 13 to make fine adjustments so that the integrated material cart 1 is aligned and fits with the line-side product rack 2, ensuring that the material box loading layer 10, material box temporary storage layer 20, material loading layer 11, empty material box temporary storage layer 21, and empty material box recycling layer 12 are adjacent to each other in the vertical direction.

[0034] Lowering the second horizontal guide rod 230: The PLC console controls the guide rod lifting mechanism 231 to lower the second horizontal guide rod 230 to the preset interception height.

[0035] Material box exchange: The integrated material cart 1 moves forward at a low and constant speed of 0.03 m / s. A material box on the material box loading layer 10 rolls on the first glass bearing 14 until its front end is intercepted by the second transverse guide rod 230, and then smoothly falls onto the second glass bearing 22 of the material box storage layer 20 under the action of inertia. At the same time, an empty material box on the empty material box storage layer 21 rolls on the second glass bearing 22 until its front end is intercepted by the first transverse guide rod 15, and then transferred to the first glass bearing 14 of the empty material box recycling layer 12, thus completing one synchronous exchange of material boxes and empty material boxes.

[0036] Raise the second horizontal guide rod 230: After a material box is exchanged, the PLC console immediately controls the guide rod lifting mechanism 231 to raise the second horizontal guide rod 230, so that it is no longer in the blocking position, preventing other material boxes on the same layer from being mistakenly sent out when the integrated material cart 1 continues to move forward, and ensuring that there are still material boxes to be sent to the subsequent assembly station.

[0037] Worker Operation and Confirmation: The operator at this assembly station can find the newly delivered material box in the temporary storage layer 20 on the product rack 2 at the line edge, and take the required materials from the box. Alternatively, the operator can directly take the required materials from the grid material box 111 in the middle of the integrated material cart 1 for assembly. After the work is completed, the worker presses the confirmation button for this assembly station, and the PLC control console receives this completion signal.

[0038] For assembly stations that do not have the line-side product rack 2 installed: Vehicle Stop: Integrated material cart 1 comes to a stop at the assembly station.

[0039] Direct material retrieval: The operator at this assembly station goes directly to the machine side and retrieves the required materials from the corresponding grid material box 111 in the material loading layer 11 for assembly.

[0040] Work Confirmation: After material handling or assembly is completed, the operator presses the confirmation button for that assembly station, and the signal is transmitted to the PLC control console.

[0041] Moving to the next station: After receiving a confirmation signal from any assembly station, the PLC control console issues an instruction to the integrated material cart 1, instructing it to move to the next assembly station in the predetermined sequence.

[0042] III. Multi-condition task state judgment and intelligent decision-making Before moving to the next assembly station after completing the work at one station, the PLC control console comprehensively checks the three states of the integrated material cart 1 to determine its next action: Material box status: The weight sensor in the material box loading layer 10 determines whether there are still material boxes.

[0043] Material status: The weight sensor in the material loading layer 11 determines whether there is still usable material in the grid material box 111. Empty container recycling status: The weight sensor of the empty container recycling layer 12 determines whether the empty container is full.

[0044] The PLC control console makes a decision based on a combination of the following: Decision to continue work: If there is at least one of the two materials, either a hopper or a material, and the empty hopper recycling layer is not yet full, the integrated material cart 1 is instructed to continue to the next assembly station.

[0045] Decision to return to the material replenishment area: If any of the following conditions are met, the integrated material cart 1 is instructed to interrupt the current delivery cycle and return to the material replenishment area: Both the hopper and the material are exhausted: there are no more hoppers in the hopper loading layer 10, and the material in the material loading layer 11 is also used up.

[0046] Empty material box recycling layer is full: Empty material box recycling layer 12 has reached the preset full load state.

[0047] Received an urgent instruction: Received a system instruction that requires a change of production line or other return.

[0048] IV. Return to the loading area and hand over the task After the integrated material cart 1 returns to the material replenishment area according to the decision: Unloading and reloading: The operator empties the empty material boxes retrieved from the integrated material cart 1, and then reloads the material boxes into the material box loading layer 10 according to the new delivery task order, and replenishes various materials into the material loading layer 11.

[0049] Task handover and continuous production: The PLC control console updates the system status. If integrated material cart 1 returns because it has run out of material boxes, but there are still assembly stations on the production line that need to be supplied, the PLC control console can immediately dispatch another integrated material cart 1 that has already been loaded to start from the assembly station where the delivery was interrupted and continue to complete the subsequent delivery task. This achieves seamless handover between different integrated material carts 1, ensuring a continuous supply of production materials and preventing production interruptions.

[0050] Based on the structure of the integrated material cart 1 and the line-side product rack 2, and the coordinated action of the first transverse guide rod 15 and the second transverse guide rod 230, the delivery of fully loaded material boxes to the line-side product rack 2 and the retrieval of empty material boxes to the integrated material cart 1 are completed in one travel motion. Furthermore, the system is configurable and expandable. The number of integrated material carts 1, the layout of the line-side product rack 2, and the type and number of assembly stations can all be flexibly configured and combined according to the actual production cycle, material type, and production line topology. This design eliminates the waiting time of unloading before loading in traditional delivery modes and further reduces the material handover time at individual assembly stations, significantly improving overall operational efficiency and automation levels.

[0051] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An automated material conveying system for an engine pre-assembly line, characterized in that, The system includes at least one integrated material cart and at least one line-side product rack. The integrated material cart includes, from top to bottom, a box loading layer, a material loading layer, and an empty box recycling layer. The line-side product rack includes, from top to bottom, a box temporary storage layer and an empty box temporary storage layer. The box loading layer is used to load boxes, and the empty box temporary storage layer is used to load empty boxes. When an integrated material cart and a line-side product rack are aligned and fitted together, the box loading layer, the box temporary storage layer, the material loading layer, the empty box temporary storage layer, and the empty box recycling layer are arranged sequentially from top to bottom. In this configuration, several first glass bearings are provided on the bearing surfaces of both the material box loading layer and the empty material box recycling layer. A first transverse guide rod is provided between the empty material box temporary storage layer and the material loading layer. Several second glass bearings are provided on the bearing surfaces of both the material box temporary storage layer and the empty material box temporary storage layer. A guide rod lifting mechanism is provided on the material box temporary storage layer. One end of the guide rod lifting mechanism is connected to the material box temporary storage layer, and the end of the guide rod lifting mechanism away from the material box temporary storage layer is connected to the second transverse guide rod. The second transverse guide rod is located on the side of the material box loading layer opposite to the material box temporary storage layer.

2. The automatic material conveying system for engine pre-assembly line according to claim 1, characterized in that, The material loading layer is equipped with several grid-type material boxes.

3. The automatic material conveying system for the engine pre-assembly line according to claim 1, characterized in that, The guide rod lifting mechanism includes a material guide descent bearing and a drive assembly. The line-side product rack includes a fixed column. One end of the material box temporary storage layer and the empty material box temporary storage layer are both connected to the fixed column. One side of the fixed column is recessed to form a receiving groove. The two opposite ends of the drive assembly are respectively connected to the bottom of the receiving groove and the material guide descent bearing. The end of the material guide descent bearing away from the drive assembly is connected to the second transverse guide rod. The drive assembly is used to drive the material guide descent bearing to move in the vertical direction.

4. The automatic material conveying system for engine pre-assembly line according to claim 1, characterized in that, The integrated material cart is provided with a guide rail on one side, and the extension direction of the guide rail is parallel to the travel path of the integrated material cart.

5. The automatic material conveying system for engine pre-assembly line according to claim 1, characterized in that, The automatic material conveying system for the engine pre-assembly line also includes a pre-assembly line area, which has several assembly stations, and some of the assembly stations are equipped with the line-side product racks.

6. The automatic material conveying system for the engine pre-assembly line according to claim 5, characterized in that, The automatic material conveying system for the engine pre-assembly line also includes a material replenishment area, a production line control area, and a queue loading area. A PLC control console is installed in the production line control area, and sensor components are installed in the material replenishment area, the production line control area, the queue loading area, the line-side product rack, and the integrated material cart.

7. The automatic material conveying system for engine pre-assembly line according to claim 6, characterized in that, The integrated material cart is equipped with an AGV drive control unit, and the PLC console is connected to the sensor assembly, the AGV drive control unit, and the guide rod lifting mechanism via a communication network.

8. The automatic material conveying system for the engine pre-assembly line according to claim 7, characterized in that, The sensor assembly includes a position sensor and a weight sensor. The position sensor is used to collect position information, and the weight sensor is used to collect weight information. The PLC control console is used to determine whether the integrated material cart needs to return to the material replenishment area based on the collected position and weight information.

9. An automatic material feeding method for an engine pre-assembly line, used to control the automatic material conveying system for an engine pre-assembly line as described in any one of claims 1-8, characterized in that, Includes the following steps: S1, Align and attach the integrated material cart with the line-side product rack so that the material box loading layer, material loading layer, and empty material box recycling layer of the integrated material cart are sequentially adjacent to the material box temporary storage layer and empty material box temporary storage layer of the line-side product rack in the vertical direction. S2, control the guide rod lifting mechanism so that the second transverse guide rod is in a preset interception position; S3, control the movement of the integrated material cart, the material box on the material box loading layer is intercepted by the second transverse guide rod and rolls on the first glass bearing, so that the material box is transferred to the material box temporary storage layer. At the same time, the empty material box on the empty material box temporary storage layer is intercepted by the first transverse guide rod and rolls on the second glass bearing, so that the empty material box is transferred to the empty material box recycling layer.

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