Modular suspended conveyor system with sorting buffer function and method of conveying

Abstract

The application provides a modular suspension conveying system with a classification cache function and a conveying method thereof. The conveying system comprises a ring track, a plurality of cache area tracks and a trolley group. The two ends of the cache area tracks are connected with the ring track, and the trolley group can slide on the ring track and the cache area tracks. The trolley group moves on the ring track to realize conveying of articles, and stops in the cache area tracks to realize caching of the articles. Articles of the same kind or the same process are cached in the same cache area track to realize classification of the articles. The application realizes classification and caching of materials, plays a caching role, makes the rhythm between different production links more coordinated, avoids stagnation of the whole production line due to temporary stop of a certain link, and improves flexibility and reliability of production.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology of suspended conveying devices, and specifically relates to a modular suspended conveying system and conveying method with classification and buffering functions. Background Technology

[0002] A circular overhead conveyor is a widely used conveying equipment in automated production and logistics. After the drive system starts, it drives a trolley to circulate on a track system via a belt or other transmission device. The suspension devices on the trolleys move along with the trolleys, thus transporting the suspended items from one location to another. During the conveying process, the control system controls the drive system, switches, etc., according to preset programs and instructions to achieve accurate conveying, diversion, and merging of items.

[0003] In modern manufacturing processes, such as the automotive industry, the conveying and assembly of automotive parts like frames, bodies, and engines requires automated material handling between different workstations to improve production efficiency and quality. This necessitates that, depending on actual needs or production processes, hangers carrying different workpieces need to stop individually or in batches at designated channels for categorized buffering and easy retrieval later. However, existing overhead conveyor lines do not possess this function; they can only transport a single item or a batch of items. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a modular suspended conveying system and conveying method with classification and buffering function, aiming to solve the above technical problems.

[0005] Technical Solution: To achieve the above objectives, this invention provides a modular suspended conveying system with classification and buffering functions, comprising: a circular track, several buffer zone tracks, and a trolley group. The two ends of the buffer zone tracks are connected to the circular track, and the trolley group can slide on the circular track and the buffer zone tracks. The trolley group moves on the circular track to transport items, and stops when the trolley group enters the buffer zone tracks to buffer the items. Items of the same type or in the same process are buffered on the same buffer zone track to achieve item classification. Multiple drive units are provided on both the circular track and the buffer zone track. Each drive unit includes a circular belt and a drive motor for driving the circular belt. After the circular belt is connected to the trolley group, it can drive the trolley group to slide. The circular track is equipped with a hoist. The left side of the circular track is connected to the buffer zone track via a pneumatic diversion switch, and the right side of the circular track is connected to the buffer zone track via a mechanical merging switch. The left side of the hoist is the channel for entering the buffer zone, and the right side is the channel for exiting the buffer zone. The trolleys carrying items can perform online or offline operations through the hoist. The pneumatic diversion turnout includes a housing, a cylinder and a turnout block respectively disposed on the upper and lower sides of the housing, and a rotating shaft rotatably disposed on the housing. One end of the rotating shaft is connected to the turnout block, and the other end is connected to the cylinder through a connecting rod. The mechanical merging turnout includes a housing two, a return spring and a turnout block two respectively disposed on the upper and lower sides of the housing two, and a rotating shaft two rotatably disposed on the housing two. One end of the rotating shaft two is connected to the turnout block two, and the other end is connected to the return spring through a connecting rod.

[0006] Furthermore, the trolley assembly includes at least one set of traveling units, a fixed crossbeam, and a hanger connected to the traveling units via the fixed crossbeam; Each group of walking units includes a set of vehicles, each set of vehicles includes a vehicle body, walking wheels on the vehicle body, guide wheels below the vehicle body, and a drive block that rubs against the annular belt; the drive block obtains power by rubbing against the annular belt, and the vehicle set can slide on the line; The vehicle body is rotatably equipped with a load-bearing axle, and the other end of the load-bearing axle is rotatably connected to a transition beam. The transition beam is rotatably connected to a fixed beam. The load-bearing axle and the transition beam, as well as the transition beam and the fixed beam, are all rotatably connected. When the trolley group passes through a curve, the load-bearing axle, the transition beam, and the fixed beam can rotate relative to each other, ensuring that even a longer trolley group can smoothly pass through curves. The rear assembly stacking needle is also located on the transition crossbeam at the rear end.

[0007] Furthermore, the bottom surface of the drive block is provided with a guide shaft and a release shaft. The release shaft passes through the vehicle body and has an accumulation wheel at its bottom. A spring is fitted on the release shaft to support the drive block in contact with the annular belt. The other end of the guide shaft is inserted into the vehicle body. The spring force provides an upward force to the drive block, ensuring it remains in contact with the annular belt and thus obtaining continuous power.

[0008] Furthermore, the buffer zone track is equipped with an accumulation mechanism, which includes a pressure rail with the same number of train sets. The pressure rail has upwardly inclined transition sections at both ends, and the position of the pressure rail is lower than the accumulation wheel. The accumulation wheel rolls through the transition section to the middle of the pressure rail. At this time, the accumulation wheel drives the drive block at the upper end of the disengagement shaft to move down. The drive block disengages from the annular belt and loses power from the train set, thus stopping. It also includes a stopping mechanism located at the exit end of the buffer zone track, comprising a bracket on the buffer zone track, a lateral movement cylinder mounted on the bracket, and a moving plate connected to the actuating end of the lateral movement cylinder. The bottom of the moving plate has a stop rail structure identical to the pressure rail structure. The lateral movement cylinder drives the moving plate to move laterally with the stop rail, disengaging the accumulation wheel that was previously in contact with the stop rail. Under the action of the spring, the drive block contacts the annular belt and regains power, allowing the trolley group to continue moving. The accumulation wheels of other trolley groups will also move away from the pressure rail and regain power.

[0009] Furthermore, the circular track has a 90° curved track at the corner.

[0010] Furthermore, the annular belt is wound around a pulley and a tensioning pulley located on the annular track and the buffer zone track, and the pulley is connected to the output shaft of the drive motor.

[0011] Furthermore, the annular track is provided with a movable section, and the actuator of the hoist is connected to the movable section so that it can be vertically raised and lowered and docked or separated from the annular track.

[0012] Furthermore, the hoist includes a frame, a cantilever mechanism and a counterweight assembly slidably disposed on the front and rear sides of the frame, and a belt driven by a motor on the frame. Both the cantilever mechanism and the counterweight assembly are connected to the belt, and the cantilever mechanism is connected to the movable section. When the trolley group enters the movable section for loading or unloading, the cantilever mechanism of the hoist moves the movable section up and down, allowing it to engage or disengage from the circular track, thus enabling the trolley group to load or unload.

[0013] A conveying method for a ring-shaped overhead conveyor system includes: Items are placed on the hangers according to different needs, and the movable section with the trolley group is lifted by the hoist and connected to the circular track. The trolley is driven along the circular track and its direction of travel is changed by the pneumatic diversion switch. It enters different buffer zone tracks and loses power through the cooperation of the accumulation wheel and the pressure rail, thus stopping the trolley at the designated position for buffering. When items need to be removed from the trolley group, the lateral movement cylinder drives the stop rail to disengage it from the accumulation wheel on a certain trolley group. The drive block rebounds and contacts the ring belt to obtain power, causing the trolley group to move. After moving a certain distance, the accumulation wheels on other trolley groups leave the rail and regain power. Then, they enter the other end of the ring track through the mechanical merging switch, and finally enter the moving section to be lowered by the hoist, forming a closed-loop conveying classification and buffering strategy.

[0014] As can be seen from the above technical solution, the present invention has the following beneficial effects: 1. This invention provides a modular suspended conveying system and conveying method with classification and buffering functions. The trolleys carrying materials are put on or taken off the production line by a hoist. The circular track serves as the main way for the trolleys to transport materials. Several buffer tracks connected to the circular track form multiple buffer areas. Trolleys carrying different materials enter different buffer tracks through pneumatic diversion switches, realizing classification and buffering, which plays a buffering role, making the rhythm between different production links more coordinated, avoiding the stagnation of the entire production line due to a short pause in a certain link, and improving the flexibility and reliability of production.

[0015] 2. In addition, the trolley group can stop at a designated position by cooperating with the accumulation wheel and the pressure rail. The rear trolley group accumulation needle set at the rear end of the trolley group can stop the rear trolley by cooperating with the accumulation wheel of the rear trolley. This realizes the accumulation of a single trolley group or multiple trolley groups. At the same time, the trolley group can regain power and drive out of the buffer area track through the stopping mechanism.

[0016] 3. The modular suspended conveyor system with classification and buffering function provided by the present invention can be expanded and upgraded according to the development needs of production and logistics, and can also be well compatible and connected with other production equipment and logistics systems to realize the automation and informatization of the entire production and logistics process.

[0017] 4. The modular design of each component in this invention allows users to flexibly assemble them according to their needs to adapt to different process requirements, resulting in high adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a modular suspended conveyor system with classification and buffering function according to the present invention; Figure 2 This is a schematic diagram of the upper side of the pneumatic diversion turnout described in this invention; Figure 3 This is a schematic diagram of the lower side of the pneumatic diversion turnout described in this invention; Figure 4 This is a schematic diagram of the upper side of the mechanical merging turnout described in this invention; Figure 5 This is a schematic diagram of the structure of the lower side of the mechanical merging turnout described in this invention; Figure 6 This is a schematic diagram of the structure of the trolley assembly described in this invention; Figure 7 This is a schematic diagram of the structure of the vehicle group described in this invention; Figure 8 This is a perspective structural diagram of the vehicle group described in this invention; Figure 9 This is a schematic diagram of the parking state of the vehicle group described in this invention; Figure 10 for Figure 9 Enlarged view of point A in the middle; Figure 11 for Figure 9 Enlarged view of point B in the middle; Figure 12 for Figure 9 Enlarged view of point C in the middle; Figure 13 This is a schematic diagram of the stopping mechanism described in this invention; Figure 14 This is a schematic diagram of the structure of the hoist described in this invention.

[0019] In the diagram: 1-circular track, 11-90° curved track, 12-moving section; 2-Buffer track; 3-Carriage group, 31-Fixed crossbeam, 32-Hanger, 33-Car body, 34-Traveling wheel, 35-Guide wheel, 36-Drive block, 361-Guide shaft, 362-Disengagement shaft, 363-Accumulation wheel, 364-Spring, 37-Bearing shaft, 38-Transition crossbeam, 39-Rear carriage group accumulation needle; 5-Drive motor; 6- Hoist, 61- Frame, 62- Cantilever mechanism, 63- Counterweight assembly, 64- Belt; 7-Pneumatic diversion turnout, 71-Housing 1, 72-Cylinder, 73-Turnout block 1, 74-Shaft 1; 8-Mechanical merging turnout, 81-Housing shell two, 82-Reset spring, 83-Turnout block two, 84-Shaft two; 91-Pressure rail, 92-Bracket, 93-Transverse cylinder, 94-Stop pressure rail. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] like Figure 1-5 As shown: A modular suspended conveyor system with classification and buffering function includes: a circular track 1, several buffer zone tracks 2, and a trolley group 3. The two ends of the buffer zone tracks 2 are connected to the circular track 1, and the trolley group 3 can slide on the circular track 1 and the buffer zone tracks 2. The number and length of the buffer zone tracks 2 can be changed according to actual needs. Multiple drive units are provided on both the circular track 1 and the buffer track 2. Each drive unit includes a circular belt and a drive motor 5 for driving the circular belt. After the circular belt is connected to the trolley group 3, it can drive the trolley group 3 to slide. The drive units are closely connected to form a complete and continuous drive structure for the trolley group 3. The circular track 1 is equipped with a hoist 6. The left side of the circular track 1 is connected to the buffer zone track 2 through a pneumatic diversion switch 7, and the right side of the circular track 1 is connected to the buffer zone track 2 through a mechanical merging switch 8. The pneumatic diversion switch 7 includes a housing 71, cylinders 72 and switch blocks 73 respectively disposed on the upper and lower sides of the housing 71, and a rotating shaft 74 rotatably disposed on the housing 71. One end of the rotating shaft 74 is connected to the switch block 73, and the other end is connected to the cylinder 72 through a connecting rod. Before the trolley group 3 enters the buffer zone track 2, the cylinder 72 drives the rotating shaft 74 to connect the switch block 73 with the designated buffer zone track 2, and the trolley enters through the pneumatic diversion switch 7. The mechanical merging turnout 8 includes a housing 81, a return spring 82 and a turnout block 83 respectively located on the upper and lower sides of the housing 81. A rotating shaft 84 is rotatably mounted on the housing 81. One end of the rotating shaft 84 is connected to the turnout block 83, and the other end is connected to the return spring 82 via a connecting rod. Under normal conditions, the turnout block 83 remains in a conductive state with the buffer zone track 2, allowing the trolley group 3 to smoothly exit the buffer zone track 2. When the trolley group 3 travels on the circular track 1 and passes the mechanical merging turnout 8, the front end of the trolley group 3 impacts the turnout block 83, making it conductive with the circular track 1, allowing the trolley group 3 to pass smoothly. After the trolley group 3 passes, the turnout block 83 returns to its original position under the action of the return spring 82. The mechanical merging turnout 8 is only suitable for lightly loaded trolley groups 3. The impact of a heavily loaded trolley group 3 can easily cause the turnout block 83 to jam. Therefore, under heavy load conditions, a pneumatic merging turnout can be used instead of the mechanical merging turnout.

[0022] like Figure 6-8 The trolley assembly 3 includes at least one set of walking units, a fixed crossbeam 31, and a hanging device 32 connected to the walking units via the fixed crossbeam 31; the shape of the hanging device 32 can be determined according to the shape of the item, and can be in the form of a hanging basket, a hanging rod, etc. Each group of traveling units includes a set of vehicles. Each set of vehicles includes a vehicle body 33, traveling wheels 34 mounted on the vehicle body 33, guide wheels 35 mounted below the vehicle body 33, and a drive block 36 that frictionally contacts the annular belt. The drive block 36 obtains power by contacting the annular belt, the traveling wheels 34 slide smoothly on the track, and the guide wheels 35 provide guidance for the vehicle set to prevent derailment. In addition, the number of vehicle sets can be increased or decreased according to the size of the load.

[0023] A load-bearing shaft 37 is rotatably mounted on the vehicle body 33. The other end of the load-bearing shaft 37 is rotatably connected to a transition beam 38. The transition beam 38 is rotatably connected to a fixed beam 31. The rear assembly stacking needle 39 is also provided on the transition crossbeam 38 located at the rear end.

[0024] The drive block 36 has a guide shaft 361 and a disengagement shaft 362 on its bottom surface. The disengagement shaft 362 passes through the vehicle body 33 and has an accumulation wheel 363 at its bottom. A spring 364 is sleeved on the disengagement shaft 362 to support the drive block 36 in contact with the annular belt. The other end of the guide shaft 361 is inserted into the vehicle body 33. The spring 364 is in a compressed state. When the trolley assembly 3 moves, the upward force of the spring 364 pushes the drive block 36 upward, causing it to contact the annular belt.

[0025] Specifically, the buffer zone track 2 is equipped with an accumulation mechanism, which includes a pressure rail 91 with the same number of train sets. The two ends of the pressure rail 91 are provided with upwardly inclined transition sections, and the position of the pressure rail 91 is lower than the accumulation wheel 363. It also includes a stopping mechanism located at the exit end of the buffer zone track 2, including a bracket 92 located on the buffer zone track 2, a transverse cylinder 93 mounted on the bracket 92, the working end of the transverse cylinder 93 being connected to a moving plate, and a stopping pressure rail 94 with the same structure as the pressure rail 91 located at the bottom of the moving plate.

[0026] The accumulation principle in this embodiment is as follows: like Figure 9-13 As shown, after the trolley group 3 enters the buffer area track 2, when it reaches the predetermined stopping position, the accumulating wheels 363 on each car group of the trolley group 3 enter the pressure rail 91 and the stop pressure rail 94 respectively. Since the height of the pressure rail 91 and the stop pressure rail 94 is lower than the accumulating wheels 363, the accumulating wheels 363 will move down when they enter, thereby taking the drive block 36 off the top of the shaft 362 down with them. The drive block 362 disengages from the ring belt and loses power, thus stopping the trolley group 3. The accumulating wheels 363 of the foremost car group of the subsequent trolley group 3 enter the rear car group accumulating needle 39 on the previous trolley group 3. The accumulating wheels 363 of the remaining car groups enter the pressure rail 91 and also lose power and stop. Multiple trolley groups 3 can be accumulated in sequence. When trolley group 3 needs to leave buffer zone track 2, the lateral movement cylinder 93 on the stopping mechanism drives the moving plate to move laterally away from buffer zone track 2, carrying the stop rail 94. The accumulation wheel 363, which cooperates with the stop rail 94, disengages from it. Under the action of the spring 364, the drive block 36 reconnects with the annular belt, and the trolley group gains power to move trolley group 3. After traveling a certain distance, the accumulation wheels 363 on the remaining trolley groups all move away from the rail 91 and are released, and the entire trolley group 3 gains power. Furthermore, after trolley group 3 has moved, the rear trolley group accumulation needle 39 at its rear end disengages from the accumulation 363 at the front end of the rear trolley group 3, and the trolley group at the very front gains power. This process can be repeated to achieve the accumulation of trolley groups 3 along the entire buffer zone track 2.

[0027] Specifically, the annular track 1 is provided with a 90° curved track 11 at the corner.

[0028] Preferably, the annular belt is wound around a pulley and a tensioning pulley located on the annular track 1 and the buffer track 2, and the pulley is connected to the output shaft of the drive motor 5.

[0029] like Figure 14 As shown, the circular track 1 is provided with a movable section 12. The actuator of the hoist 6 is connected to the movable section 12, enabling it to rise and fall vertically and dock or separate from the circular track 1. The hoist 6 includes a frame 61, a cantilever mechanism 62 and a counterweight assembly 63 slidably disposed on the front and rear sides of the frame 61, respectively, and a belt 64 driven by a motor is also provided on the frame 61. The cantilever mechanism 62 and the counterweight assembly 63 are both connected to the belt 64, and the cantilever mechanism 62 is connected to the movable section 12.

[0030] A conveying method for a ring-shaped overhead conveyor system includes: According to different needs, the items are placed on the hanging fixture 32, and the movable section 12 with the trolley group 3 is lifted by the hoist 6 to connect with the circular track 1. The driving trolley group 3 changes its direction of travel along the circular track 1 through the pneumatic diversion switch 7 and enters different buffer zone tracks 2. The accumulating wheel 363 and the pressure rail 91 work together to make the trolley group 3 lose power, thereby stopping the trolley group 3 at the designated position for buffering. When it is necessary to remove items from the trolley group 3, the lateral movement cylinder 93 drives the stop rail 94 to disengage it from the accumulation wheel 363 on a certain trolley group 3. The drive block 36 rebounds and contacts the ring belt to obtain power, causing the trolley group 3 to move. After moving a certain distance, the accumulation wheels 363 on other trolley groups leave the rail 91 and regain power. Then, they enter the other end of the ring track 1 through the mechanical merging switch 8, and finally enter the moving section 12 to be lowered by the hoist 6, forming a closed-loop conveying classification and buffering strategy.

[0031] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A modular suspended conveyor system with classification and buffering function, characterized in that, include: A circular track (1), several buffer track (2) and a trolley group (3), wherein the two ends of the buffer track (2) are connected to the circular track (1), and the trolley group (3) can slide on the circular track (1) and the buffer track (2); Multiple drive units are provided on both the circular track (1) and the buffer track (2). Each drive unit includes a circular belt and a drive motor (5) for driving the circular belt. The circular belt can drive the trolley group (3) to slide after being connected to the trolley group (3). The circular track (1) is equipped with a hoist (6). The circular track (1) on the left side of the hoist (6) is connected to the buffer zone track (2) through a pneumatic diversion switch (7), and the circular track (1) on the right side is connected to the buffer zone track (2) through a mechanical merging switch (8). The pneumatic diversion turnout (7) includes a housing (71), a cylinder (72) and a turnout block (73) respectively located on the upper and lower sides of the housing (71). A rotating shaft (74) is rotatably mounted on the housing (71). One end of the rotating shaft (74) is connected to the turnout block (73), and the other end is connected to the cylinder (72) through a connecting rod. The mechanical merging turnout (8) includes a housing two (81), a return spring (82) and a turnout block two (83) respectively provided on the upper and lower sides of the housing two (81), and a rotating shaft two (84) rotatably provided on the housing two (81). One end of the rotating shaft two (84) is connected to the turnout block two (83), and the other end is connected to the return spring (82) through a connecting rod. The trolley assembly (3) includes at least one set of walking units, a fixed crossbeam (31), and a hanger (32) connected to the walking units via the fixed crossbeam (31). Each group of walking units includes a group of vehicles, each group of vehicles includes a vehicle body (33), a walking wheel (34) on the vehicle body (33), a guide wheel (35) below the vehicle body (33), and a drive block (36) that is in frictional contact with the annular belt. A load-bearing shaft (37) is rotatably mounted on the vehicle body (33), and the other end of the load-bearing shaft (37) is rotatably connected to a transition beam (38). The transition beam (38) is rotatably connected to a fixed beam (31). The rear train set accumulation needle (39) is also provided on the transition crossbeam (38) located at the rear end. The bottom surface of the drive block (36) is provided with a guide shaft (361) and a disengagement shaft (362). The disengagement shaft (362) passes through the vehicle body (33) and is provided with an accumulation wheel (363) at its bottom. A spring (364) is sleeved on the disengagement shaft (362) to support the drive block (36) in contact with the annular belt. The other end of the guide shaft (361) is inserted into the vehicle body (33). The buffer zone track (2) is provided with an accumulation mechanism, which includes a pressure rail (91) with the same number of train sets. The two ends of the pressure rail (91) are provided with upwardly inclined transition sections, and the position of the pressure rail (91) is lower than the accumulation wheel (363). It also includes a stop mechanism located at the exit end of the buffer zone track (2), including a bracket (92) located on the buffer zone track (2), a transverse cylinder (93) is provided on the bracket (92), the working end of the transverse cylinder (93) is connected to a moving plate, and the bottom of the moving plate is provided with a stop pressure rail (94) with the same structure as the pressure rail (91).

2. The modular suspended conveyor system with classification and buffering function according to claim 1, characterized in that, The circular track (1) is provided with a 90° curved track (11) at the corner.

3. A modular suspended conveyor system with classification and buffering function according to claim 1, characterized in that, The annular belt is wound around a pulley and a tensioning pulley located on the annular track (1) and the buffer track (2), and the pulley is connected to the output shaft of the drive motor (5).

4. A modular suspended conveyor system with classification and buffering function according to claim 1, characterized in that, The circular track (1) is provided with a movable section (12), and the execution end of the hoist (6) is connected to the movable section (12) so that it can be vertically raised and lowered and docked or separated from the circular track (1).

5. A modular suspended conveyor system with classification and buffering function according to claim 4, characterized in that, The hoist (6) includes a frame (61), a cantilever mechanism (62) and a counterweight assembly (63) slidably disposed on the front and rear sides of the frame (61), and a belt (64) driven by a motor is also provided on the frame (61). The cantilever mechanism (62) and the counterweight assembly (63) are both connected to the belt (64), and the cantilever mechanism (62) is connected to the movable section (12).

6. A conveying method for a ring-shaped overhead conveyor system, implemented based on a modular overhead conveyor system with classification and buffering function as described in any one of claims 1-5, characterized in that, include: According to different needs, the items are placed on the hanger (32), and the movable section (12) with the trolley group (3) is lifted by the hoist (6) to connect with the circular track (1); The driving trolley group (3) changes its direction of travel along the circular track (1) through the pneumatic diversion switch (7) and enters different buffer zone tracks (2). The accumulator wheel (363) and the pressure rail (91) work together to make the trolley group (3) lose power, thereby stopping the trolley group (3) at the designated position for buffering. When it is necessary to remove items from the trolley group (3), the lateral cylinder (93) drives the stop rail (94) to disengage it from the accumulation wheel (363) on a certain trolley group (3). The drive block (36) rebounds and contacts the ring belt to obtain power, causing the trolley group (3) to move. After moving a certain distance, the accumulation wheels (363) on other trolley groups leave the rail (91) and regain power. Then, they enter the other end of the ring track (1) through the mechanical merging switch (8) and finally enter the active section (12) and are lowered by the hoist (6), forming a closed-loop conveying classification and buffering strategy.

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