Material transport device

Abstract

This utility model discloses a material handling device, relating to the technical field of material handling devices. It includes a shelf and an automatic transport trolley. The shelf includes a blocking cylinder, an empty box area, and a material area. The blocking cylinder is located in the material area and has a touch switch. The blocking cylinder is used to block or release boxes containing materials in the material area. A slide rail is formed on one side of the shelf. The automatic transport trolley has a first platform and a second platform, which are spaced apart along the trolley's direction of movement. The automatic transport trolley has a built-in preset map and can accurately move to the shelf. The automatic transport trolley is equipped with a pulley component for rolling connection with the slide rail, so that the pulley component rolls to abut against the touch switch. By accurately transporting materials to the shelf using the automatic transport trolley, operators do not need to adjust the trolley's position multiple times, thus greatly reducing the operation time of the entire material handling process.

Description

Technical Field

[0001] This utility model relates to the field of material transport device technology, and in particular to a material transport device. Background Technology

[0002] In the automobile production process, multiple parts need to be assembled. Each part needs to be transported from its respective production line or storage location to the assembly line for assembly.

[0003] In existing technology, operators transport the ventilation hood trolley to the rack and drive the vehicle using visual guidance lines to align it, ensuring the mechanical mechanisms of the trolley and rack work together. Alignment between the rack and trolley is also achieved by the operator visually observing the stop line on the ground. However, because the operators driving the trolley are not fixed, their height and visual acuity vary, resulting in significant alignment errors and a low success rate for rack-trolley docking. When the rack and trolley are not aligned, jamming often occurs during the exchange of empty and full containers due to misalignment. Therefore, operators need to adjust the trolley's position multiple times, which makes the entire material transportation operation time-consuming.

[0004] Therefore, it is necessary to provide a new material transport device to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this utility model is to propose a material transport device, which aims to improve the technical problem of excessively long material transport operation time in the prior art.

[0006] To achieve the above objectives, this utility model provides a material conveying device, comprising:

[0007] The shelf includes a blocking cylinder, an empty box area, and a material area. The blocking cylinder is located in the material area and has a touch switch. The blocking cylinder is used to block or allow the boxes containing materials in the material area to pass through. A slide rail is formed on one side of the shelf.

[0008] An automated transport trolley is provided with a first platform and a second platform, which are spaced apart along the moving direction of the trolley. The trolley has a built-in preset map and can move precisely to the shelf, thereby connecting the first platform and the second platform to the empty box area and the material area, respectively. The trolley is provided with a pulley component, which is used to roll in connection with the slide rail so that the pulley component rolls to abut against the touch switch.

[0009] In one embodiment, the pulley component includes a connecting rod and a pulley rotatably disposed on the connecting rod. The automatic transport trolley is provided with a fixed column. A through hole is formed on the connecting rod. The connecting rod is rotatably sleeved on the fixed column through the through hole. The pulley is used for rolling connection with the slide rail.

[0010] In one embodiment, there are multiple fixed columns, which are spaced apart along the moving direction of the automatic transport trolley. There are also multiple pulley components, and the number of fixed columns and pulley components are equal and correspond one-to-one.

[0011] In one embodiment, the slide has downward-facing bends at both ends.

[0012] In one embodiment, both the empty container area and the material area are inclined, with the height of the end of the empty container area near the automatic transport trolley being higher than the height of the end of the empty container area away from the automatic transport trolley, and the height of the end of the material area near the automatic transport trolley being lower than the height of the end of the material area away from the automatic transport trolley.

[0013] In one embodiment, both the first platform and the second platform are inclined, with the first platform tilted in the same direction as the empty container area and the second platform tilted in the same direction as the material area.

[0014] In one embodiment, the empty box area includes a plurality of first tracks spaced apart along the length of the shelf, and each first track is provided with a plurality of first rollers spaced apart along the width of the shelf, the first rollers being used to roll into contact with the empty boxes.

[0015] In one embodiment, the material area includes a plurality of second tracks spaced apart along the length of the shelf, and each second track is provided with a plurality of second rollers spaced apart along the width of the shelf, the second rollers being used to roll into contact with the boxes containing the materials.

[0016] In one embodiment, the material area is provided with a first photoelectric switch, which is signal-connected to the automatic transport trolley. The first photoelectric switch is used to detect whether there is a box containing materials in the material area.

[0017] In one embodiment, the first platform is equipped with a second photoelectric switch, which is connected to the automatic transport trolley via a signal. The second photoelectric switch is used to detect whether there is an empty box on the first platform.

[0018] In the above scheme, the material transport device includes a shelf and an automatic transport trolley. The shelf includes a blocking cylinder, an empty box area, and a material area. The blocking cylinder is located in the material area and has a touch switch. The blocking cylinder is used to block or allow the boxes containing materials in the material area to pass. A slide rail is formed on one side of the shelf. The automatic transport trolley is equipped with a first platform and a second platform. The first platform and the second platform are spaced apart along the moving direction of the automatic transport trolley. The automatic transport trolley has a preset map built in it and can move precisely to the shelf, thereby connecting the first platform and the second platform to the empty box area and the material area, respectively. The automatic transport trolley is equipped with a pulley component, which is used to roll in connection with the slide rail so that the pulley component rolls to abut against the touch switch. Specifically, the automated guided vehicle (AGV) is equipped with a preset map. Following this map and route, the AGV moves precisely to the shelf. During alignment, the pulley system rolls along the shelf's tracks. When the pulley system contacts a touch switch, the extension shaft of the blocking cylinder retracts, preventing it from obstructing the boxes containing materials in the material area. At this point, the first platform of the AGV aligns with and connects to the empty box area on the shelf, while the second platform aligns with and connects to the material area on the shelf. The operator then pushes the boxes containing materials from the material area onto the second platform and pushes the empty boxes from the first platform onto the empty box area on the shelf, completing the empty-to-full exchange. After the exchange, the AGV leaves the shelf along the preset route. The pulley system then separates from the touch switch, and the extension shaft of the blocking cylinder extends, preventing the boxes containing materials from leaving the material area. The AGV then transports the materials to the assembly line. In this invention, by setting the manually driven trolley as an automatic transport trolley and embedding a map in the automatic transport trolley, the automatic transport trolley can accurately transport materials to the shelves according to a preset route and ensure precise alignment between the automatic transport trolley and the shelves. This prevents jamming during the exchange of empty and full boxes, eliminating the need for operators to adjust the trolley's position multiple times, thus greatly reducing the operation time of the entire material transportation process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1A schematic diagram of the structure of an embodiment of the material transport device provided by this utility model;

[0021] Figure 2 A schematic diagram of the structure of an embodiment of the material transport device provided by this utility model from another perspective;

[0022] Figure 3 A partial structural schematic diagram of an embodiment of the material transport device provided by this utility model;

[0023] Figure 4 A partial structural schematic diagram from another perspective of an embodiment of the material transport device provided by this utility model;

[0024] Figure 5 This is a schematic diagram showing the connection between the pulley component and the slide rail according to an embodiment of the present invention.

[0025] Explanation of icon numbers:

[0026] 100. Material conveying device; 1. Shelf; 11. Blocking cylinder; 111. Touch switch; 12. Empty box area; 121. First track; 121a. First roller; 13. Material area; 131. Second track; 131a. Second roller; 132. First photoelectric switch; 14. Slide rail; 141. Bending part; 2. Automatic transport trolley; 21. First platform; 22. Second platform; 23. Pulley assembly; 231. Connecting rod; 231a. Through hole; 232. Pulley; 24. Fixed column.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] To achieve the above objectives, please refer to Figures 1 to 5This utility model proposes a material transport device 100, including a shelf 1 and an automatic transport trolley 2. The shelf 1 includes a blocking cylinder 11, an empty box area 12, and a material area 13. The blocking cylinder 11 is disposed in the material area 13 and has a touch switch 111 formed on it. The blocking cylinder 11 is used to block or allow the boxes containing materials in the material area 13 to pass. A slide rail 14 is formed on one side of the shelf 1. The automatic transport trolley 2 is provided with a first platform 21 and a second platform 22. The first platform 21 and the second platform 22 are spaced apart along the moving direction of the automatic transport trolley 2. The automatic transport trolley 2 has a preset map built in it and can move precisely to the shelf 1, thereby connecting the first platform 21 and the second platform 22 to the empty box area 12 and the material area 13, respectively. The automatic transport trolley 2 is provided with a pulley component 23, which is used to roll in connection with the slide rail 14 so that the pulley component 23 rolls to abut against the touch switch 111. Specifically, the automated transport trolley 2 is equipped with a preset map. The trolley 2 operates according to the preset map and route, allowing it to move precisely to the shelf 1. During this alignment process, the pulley component 23 rolls on the slide rail 14 of the shelf 1. When the pulley component 23 abuts against the touch switch 111, the extension shaft of the blocking cylinder 11 retracts, preventing the blocking cylinder 11 from obstructing the boxes containing materials on the material area 13. At this point, the first platform 21 on the automated transport trolley 2 is aligned and connected to the empty box area 12 on the shelf 1. Platform 22 is aligned and connected to material area 13 on shelf 1. The operator then pushes the boxes containing materials from material area 13 onto platform 22 and pushes the empty boxes from platform 21 onto empty box area 12 on shelf 1, thus completing the empty-to-full box exchange. After the exchange, the automated transport trolley 2 leaves shelf 1 along its preset route. At this point, pulley component 23 separates from touch switch 111, and the extension shaft of blocking cylinder 11 extends, preventing the boxes containing materials from leaving material area 13. The automated transport trolley 2 then transports the materials to the line for assembly. In this embodiment, by setting the manually driven trolley as the automated transport trolley 2 and embedding a map within it, the automated transport trolley 2 can accurately transport materials to shelf 1 along a preset route and precisely align with shelf 1. This prevents jamming during the empty-to-full box exchange process, eliminating the need for operators to repeatedly adjust the trolley's position and significantly reducing the overall material transport time.

[0032] Please see Figures 3 to 5In one embodiment, the pulley component 23 includes a connecting rod 231 and a pulley 232 rotatably disposed on the connecting rod 231. The automatic transport trolley 2 is provided with a fixed column 24. A through hole 231a is formed on the connecting rod 231. The connecting rod 231 is rotatably sleeved on the fixed column 24 through the through hole 231a. The pulley 232 is used for rolling connection with the slide rail 14. When the pulley component 23 contacts the slide rail 14 of the shelf 1, the connecting rod 231 first contacts the slide rail 14, which will push the connecting rod 231 to rotate. The automatic transport trolley 2 continues to move until the pulley 232 rolls into contact with the slide rail 14. In this way, the pulley 232 will fit tightly with the slide rail 14, and there will be no gap between the pulley 232 and the slide rail 14. This ensures that the pulley 232 and the slide rail 14 maintain a continuous rolling connection. The pulley 232 is rotated and sleeved on the fixed column 24 of the automatic transport trolley 2 through the connecting rod 231, so that the entire pulley component 23 has a certain degree of rotational freedom. When the automatic transport trolley 2 approaches the shelf 1, the pulley 232 can be finely adjusted according to the direction of the slide rail 14, automatically adapting to the positional deviation of the slide rail 14. The pulley 232 and the slide rail 14 on the shelf 1 roll together to form a guiding mechanism.

[0033] Please see Figure 3 and Figure 4 In one embodiment, there are multiple fixed columns 24, which are spaced apart along the moving direction of the automated transport trolley 2. There are also multiple pulley components 23, with the number of fixed columns 24 equal to the number of pulley components 23, and they are arranged in a one-to-one correspondence. The distribution of multiple pulley components 23 along the moving direction allows multiple pulleys 232 to simultaneously or sequentially contact the slide rail 14 of the shelf 1 when the automated transport trolley 2 approaches the shelf 1. This multi-point support enhances the alignment between the automated transport trolley 2 and the shelf 1, reducing offset or jamming caused by single-point contact. Increasing the number of pulley components 23 effectively increases the contact points with the slide rail 14, improving the guiding effect.

[0034] Please see Figure 4 In one embodiment, the slide rail 14 has downward-curved portions 141 at both ends. The downward-curved structure at both ends of the slide rail 14 allows the pulleys 232 to slide into or out of the slide rail 14 more naturally when the automatic transport trolley 2 approaches or leaves the shelf 1, thus avoiding collisions or jamming between the pulleys 232 and the edge of the slide rail 14. The curved portions 141 provide a certain amount of guide space for the pulleys 232, so that even if there is a slight positional deviation of the automatic transport trolley 2, it can be automatically adjusted and aligned by the curved portions 141. The curved portions 141 also act as a buffer when the pulleys 232 enter the slide rail 14, avoiding hard impacts.

[0035] Please see Figure 1 and Figure 2In one embodiment, both the empty box area 12 and the material area 13 are inclined. The height of the end of the empty box area 12 near the automatic transport trolley 2 is higher than the height of the end of the empty box area 12 away from the automatic transport trolley 2, and the height of the end of the material area 13 near the automatic transport trolley 2 is lower than the height of the end of the material area 13 away from the automatic transport trolley 2. The automated transport trolley 2 operates according to a preset map and route, allowing it to move precisely to the shelf 1. During this alignment process, the pulley component 23 rolls along the slide rail 14 of the shelf 1. When the pulley component 23 comes into contact with the touch switch 111, the extension shaft of the blocking cylinder 11 retracts, preventing it from obstructing the boxes containing materials on the material area 13. At this point, the first platform 21 of the automated transport trolley 2 aligns and connects with the empty box area 12 on the shelf 1, and the second platform 22 of the automated transport trolley 2 aligns and connects with the material area 13 on the shelf 1. Since the material area 13 is inclined, the boxes containing materials will slide onto the second platform due to gravity. Platform 22 abuts against the edge of the second platform 22 or against the box that previously entered the second platform 22. Simultaneously, it pushes the empty box on the first platform 21 to the entrance of the empty box area 12 of the shelf 1. The empty box area 12 is also tilted, allowing the empty box to slide until it abuts against the edge of the empty box area 12 or against the box that previously entered the empty box area 12, thus completing the empty-to-full exchange. After the exchange, the automatic transport trolley 2 leaves the shelf 1 along the preset route. At this point, the pulley component 23 separates from the touch switch 111, and the extension shaft of the blocking cylinder 11 extends. The blocking cylinder 11 then prevents the box containing materials on the material area 13 from detaching from the material area 13. The automatic transport trolley 2 transports the materials to the line for assembly. By tilting both the empty box area 12 and the material area 13, the automatic movement of the boxes is achieved by the gravity of the empty or material-filled boxes, eliminating the need for manual pushing throughout the process and significantly reducing the labor intensity of the operators.

[0036] Please see Figure 1 and Figure 2In one embodiment, both the first platform 21 and the second platform 22 are inclined. The inclination direction of the first platform 21 is the same as that of the empty box area 12, and the inclination direction of the second platform 22 is the same as that of the material area 13. The automatic transport trolley 2 runs according to a preset map and route, so that the automatic transport trolley 2 can move precisely to the shelf 1. At the same time, during the movement of the automatic transport trolley 2 to align with the shelf 1, the pulley component 23 rolls on the slide rail 14 of the shelf 1. When the pulley component 23 abuts against the touch switch 111, the extension shaft of the blocking cylinder 11 retracts, so that the blocking cylinder 11 will not block the boxes containing materials on the material area 13. At this time, the first platform 21 on the automatic transport trolley 2 is aligned and connected with the empty box area 12 on the shelf 1, and the second platform 22 on the automatic transport trolley 2 is aligned and connected with the material area 13 on the shelf 1. Since the material area 13 is inclined, the boxes containing materials are lifted by gravity. The empty box will slide to the second platform 22, abutting against the edge of the second platform 22 or against the box that previously entered the second platform 22. Simultaneously, the empty box on the first platform 21 slides to the empty box area 12 due to gravity, abutting against the edge of the empty box area 12 or against the box that previously entered the empty box area 12. This completes the exchange of empty and full containers. After the exchange, the automatic transport trolley 2 leaves the shelf 1 along the preset route. At this time, the pulley component 23 separates from the touch switch 111, and the extension shaft of the blocking cylinder 11 extends. The blocking cylinder 11 prevents the box containing materials on the material area 13 from detaching from the material area 13. The automatic transport trolley 2 transports the materials to the line for assembly. By tilting the first platform 21, the second platform 22, the empty box area 12, and the material area 13, the automatic movement of the boxes is achieved by the gravity of the empty or material-filled boxes. Thus, the entire transport process of the material transport device 100 does not require manual operation, achieving automated material transport.

[0037] Please see Figure 1 and Figure 2In one embodiment, the empty container area 12 includes multiple first tracks 121 spaced apart along the length of the shelf 1. Each first track 121 is equipped with multiple first rollers 121a spaced apart along the width of the shelf 1. The first rollers 121a are used for rolling contact with the empty containers. Rolling contact significantly reduces friction compared to sliding contact, making the empty containers move more smoothly in the empty container area 12 and preventing them from getting stuck. The roller design allows the empty containers to move along the tracks more quickly and efficiently, especially when tilted. The gravity-assisted rolling motion is smoother than direct sliding, improving the overall material transport efficiency. The presence of multiple tracks and rollers provides more support points for empty containers or containers filled with materials, which can better distribute the load and ensure that the empty containers or containers filled with materials remain stable during movement, reducing the risk of tipping over due to imbalance. Since the tracks and rollers are arranged at certain intervals, the size and weight limits of the pallets can be adjusted according to actual needs, increasing the system's flexibility and ability to adapt to different pallet sizes.

[0038] Please see Figure 1 and Figure 2 In one embodiment, the material area 13 includes a plurality of second tracks 131 spaced apart along the length of the shelf 1. Each second track 131 is provided with a plurality of second rollers 131a spaced apart along the width of the shelf 1. The second rollers 131a are used to make rolling contact with the boxes containing materials. Rolling contact significantly reduces friction compared to sliding contact, which makes the boxes containing materials move more smoothly in the material area 13 and prevents the boxes containing materials from getting stuck in the material area 13. The roller design allows the boxes containing materials to move along the tracks more quickly and efficiently. Especially when the boxes are tilted, the gravity-assisted rolling motion is smoother than direct sliding, improving the overall material transportation efficiency. The presence of multiple tracks and rollers provides more support points for empty or filled boxes, which can better distribute the load and ensure that the empty or filled boxes remain stable during movement, reducing the risk of tipping over due to imbalance. Because the tracks and rollers are arranged at certain intervals, the size and weight limits of the pallets can be adjusted according to actual needs, increasing the system's flexibility and ability to adapt to pallets of different specifications.

[0039] Please see Figure 1 and Figure 2In one embodiment, the material area 13 is equipped with a first photoelectric switch 132, which is signal-connected to the automatic transport trolley 2. The first photoelectric switch 132 is used to detect whether there are boxes containing materials in the material area 13. The transmitter and receiver of the first photoelectric switch 132 are respectively installed on both sides of the box containing materials. When a box containing materials passes between the transmitter and the receiver, the light is blocked, and the receiver detects a decrease in light intensity, indicating that there are still boxes containing materials in the material area 13. When the receiver detects that the light intensity remains at a normal level, it indicates that there are no boxes containing materials in the material area 13. At this time, the first photoelectric switch 132 transmits a signal to the automatic transport trolley 2, and the automatic transport trolley 2 will leave the shelf 1 according to a preset route. This ensures that the automatic transport trolley 2 can transport all the boxes containing materials on the shelf 1 at once, achieving fully automated transportation without the need for operator intervention.

[0040] In one embodiment, the first platform 21 is equipped with a second photoelectric switch, which is signal-connected to the automated transport trolley 2. The second photoelectric switch is used to detect whether there are empty boxes on the first platform 21. After the second photoelectric switch detects that all empty boxes on the first platform 21 have moved to the empty box area 12, it transmits a signal to the automated transport trolley 2. The automated transport trolley 2 then leaves the shelf 1 according to a preset route. This ensures that the automated transport trolley 2 can unload all empty boxes from the first platform 21 before transporting them, ensuring that each automated transport trolley 2 can be fully loaded and unload all empty boxes, thus improving transportation efficiency.

[0041] The above are merely exemplary embodiments of this utility model and do not limit the scope of protection of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A material conveying device, characterized in that, include: The shelf includes a blocking cylinder, an empty box area, and a material area. The blocking cylinder is located in the material area and has a touch switch. The blocking cylinder is used to block or allow the boxes containing materials in the material area to pass through. A slide rail is formed on one side of the shelf. An automated transport trolley is provided with a first platform and a second platform, which are spaced apart along the moving direction of the trolley. The trolley has a built-in preset map and can move precisely to the shelf, thereby connecting the first platform and the second platform to the empty box area and the material area, respectively. The trolley is provided with a pulley component, which is used to roll in connection with the slide rail so that the pulley component rolls to abut against the touch switch.

2. The material conveying device as described in claim 1, characterized in that, The pulley component includes a connecting rod and a pulley rotatably mounted on the connecting rod. The automatic transport trolley is provided with a fixed column. A through hole is formed on the connecting rod. The connecting rod is rotatably sleeved on the fixed column through the through hole. The pulley is used for rolling connection with the slide rail.

3. The material conveying device as described in claim 2, characterized in that, The number of fixed columns is multiple, and the multiple fixed columns are spaced apart along the moving direction of the automatic transport trolley. The number of pulley components is multiple, and the number of multiple fixed columns and the number of multiple pulley components are equal and correspond one-to-one.

4. The material conveying device as described in claim 3, characterized in that, The slide has downward-facing bends at both ends.

5. The material conveying device as described in any one of claims 1 to 4, characterized in that, Both the empty container area and the material area are inclined. The height of the empty container area near the automatic transport trolley is higher than the height of the empty container area away from the automatic transport trolley, and the height of the material area near the automatic transport trolley is lower than the height of the material area away from the automatic transport trolley.

6. The material conveying device as described in claim 5, characterized in that, Both the first platform and the second platform are tilted. The tilt direction of the first platform is the same as the tilt direction of the empty box area, and the tilt direction of the second platform is the same as the tilt direction of the material area.

7. The material conveying device as described in claim 6, characterized in that, The empty box area includes a plurality of first tracks spaced apart along the length of the shelf, and each first track is provided with a plurality of first rollers spaced apart along the width of the shelf, the first rollers being used to roll in contact with the empty boxes.

8. The material conveying device as described in claim 7, characterized in that, The material area includes a plurality of second tracks spaced apart along the length of the shelf, and each second track is provided with a plurality of second rollers spaced apart along the width of the shelf. The second rollers are used to make rolling contact with the boxes containing the materials.

9. The material conveying device as described in any one of claims 1 to 4, characterized in that, The material area is equipped with a first photoelectric switch, which is connected to the automatic transport trolley via a signal. The first photoelectric switch is used to detect whether there is a box containing materials in the material area.

10. The material conveying device as described in claim 9, characterized in that, The first platform is equipped with a second photoelectric switch, which is connected to the signal of the automatic transport trolley. The second photoelectric switch is used to detect whether there is an empty box on the first platform.

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