Modularized suspension conveying system with classified caching function and conveying method

Abstract

The invention provides a modular suspension conveying system with a classified caching function and a conveying method thereof.The conveying system comprises an annular rail, a plurality of caching area rails and trolley sets, the two ends of each caching area rail are connected with the annular rail, and the trolley sets can slide on the annular rail and the caching area rails; the trolley set moves on the annular track to achieve conveying of the articles, the trolley set stops achieving temporary storage of the articles after entering the temporary storage area track, the articles of the same kind or the same working procedure are temporarily stored on the same temporary storage area track, and classification of the articles is achieved. According to the invention, classified caching of materials is realized, a caching effect is achieved, rhythms among different production links are more coordinated, stagnation of the whole production line caused by short pause of a certain link is avoided, and the flexibility and reliability of production are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical suspension conveying devices, and in particular relates to a modular suspension conveying system with a classification and caching function and a conveying method. Background Art

[0002] Circular overhead conveyors are widely used in automated production and logistics. Once the drive system is activated, a belt or other transmission device drives a trolley in a circular motion along a track system. The trolley's suspension mechanism moves with it, transporting the suspended items from one location to another. During the conveying process, a control system controls the drive system and switches according to pre-set programs and instructions, ensuring accurate conveying, diversion, and merging of items.

[0003] In modern production processes, such as the automotive manufacturing industry, for conveying and assembling auto parts like frames, bodies, and engines, automated material handling between different workstations is crucial to improving production efficiency and quality. Depending on actual needs and production processes, hangers carrying different workpieces must be stopped individually or in batches in designated lanes to achieve classified caching and facilitate later retrieval. However, existing overhead conveyor lines lack this functionality and are only capable of transporting 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 hanging conveying system and conveying method with classification caching function, aiming to solve the above technical problems.

[0005] Technical Solution: To achieve the above-mentioned objectives, the present invention provides a modular overhead conveying system with a classification and caching function, comprising: a circular track, a plurality of cache area tracks, and a trolley assembly, wherein both ends of the cache area track are connected to the circular track, and the trolley assembly can slide on the circular track and the cache area track; the trolley assembly moves on the circular track to convey items, and stops after entering the cache area track to cache items. Items of the same type or in the same process are cached on the same cache area track, thereby achieving item classification; The annular track and the buffer track are both provided with a plurality of drive units, each of the drive units comprising an annular belt and a drive motor for driving the annular belt, and the annular belt can drive the trolley group to slide after being connected to the trolley group; A hoist is provided on the circular track. The circular track on the left side of the hoist is connected to the buffer track via a pneumatic diversion switch, and the circular track on the right side is connected to the buffer track via a mechanical merging switch. The left side of the hoist is a passage for entering the buffer area, and the right side is a passage for exiting the buffer area. The trolley group carrying items is put on or off the line through the hoist. The pneumatic diverter turnout comprises a housing, a cylinder and a turnout block respectively provided on the upper and lower sides of the housing, a rotating shaft rotatably provided on the housing, one end of the rotating shaft being connected to the turnout block, and the other end being connected to the cylinder via a connecting rod; The mechanical merging turnout includes a shell body 2, a return spring and a turnout block 2 respectively arranged on the upper and lower sides of the shell body 2, a rotating shaft 2 is rotatably arranged on the shell body 2, one end of the rotating shaft 2 is connected to the turnout block 2, and the other end is connected to the return spring through a connecting rod.

[0006] Furthermore, the trolley group includes at least one set of traveling units, fixed beams, and hangers connected to the traveling units via the fixed beams; Each set of the traveling units includes a set of carriages, each of which includes a carriage body, traveling wheels provided on the carriage body, guide wheels provided below the carriage body, and a driving block in frictional contact with an endless belt; the driving block obtains power by frictional contact with the endless belt, so that the carriage set can slide on the linear body; A load-bearing shaft is rotatably provided on the vehicle body, and the other end of the load-bearing shaft is rotatably connected to the transition beam, and the transition beam is rotatably connected to the fixed beam; the load-bearing shaft and the transition beam, and the transition beam and the fixed beam are all rotatably connected, and the load-bearing shaft, the transition beam, and the fixed beam can rotate relative to each other when the trolley group passes through a bend, ensuring that a longer trolley group can also pass through the bend smoothly; There is also a rear vehicle group storage needle on the transition beam at the rear end.

[0007] Furthermore, the bottom surface of the drive block is equipped with a guide shaft and a disengagement shaft. The disengagement shaft is installed through the vehicle body and has an accumulation wheel at its bottom. The disengagement shaft is sleeved with a spring that supports the drive block in contact with the endless belt. The other end of the guide shaft is plugged into the vehicle body. The elastic force of the spring provides an upward force for the drive block, ensuring that it always contacts the endless belt, thereby generating continuous power.

[0008] Furthermore, an accumulation mechanism is provided on the track of the buffer area, and the accumulation mechanism includes a pressure rail with the same number of vehicle groups, and an upwardly inclined transition section is provided at both ends of the pressure rail, and the position of the pressure rail is lower than the accumulation wheel; the accumulation wheel rolls to the middle of the pressure rail through the transition section, and at this time the accumulation wheel drives the driving block at the upper end of the separation shaft to move downward, and the driving block is separated from the endless belt, and the vehicle group loses power and stops; The system also includes a stop mechanism located at the exit of the buffer track, comprising a bracket mounted on the buffer track, a transverse cylinder mounted on the bracket, and an active end of the transverse crossbar connected to a movable plate. The bottom of the movable plate is provided with a stop rail having the same structure as the rail pressure. The transverse cylinder drives the movable plate to move laterally, carrying the stop rail pressure. Accumulation wheels previously in contact with the stop rail pressure disengage from it. Under the action of a spring, the drive block contacts the endless belt to regain power, allowing the trolley group to continue moving. Accumulation wheels of other trolley groups also move away from the pressure rail, regaining power.

[0009] Furthermore, a 90° curved track is provided at the corner of the circular track.

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

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

[0012] Furthermore, the elevator 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. The cantilever mechanism and the counterweight assembly are both connected to the belt, and the cantilever mechanism is connected to a movable section. When the trolley group enters the movable section when going online or offline, the elevator's cantilever mechanism moves the movable section up and down, and the movable section docks or detaches with the circular track, thereby enabling the trolley group to go online or offline.

[0013] A conveying method of an annular suspension conveying system, comprising: Place items on the hanger according to different needs, and use the hoist to lift the movable section with the trolley group to dock with the circular track; The trolley group is driven along the circular track to change its direction through the pneumatic shunting switch, and enters different buffer area tracks. The accumulating wheels cooperate with the rail pressure to make the trolley group lose power, so that the trolley group can be stopped at the designated location for buffering; When it is necessary to take out items from the trolley group, the pressure rail is stopped by driving the transverse cylinder to disengage it from the accumulation wheel on one of the trolley groups. The drive block rebounds and contacts the circular belt to obtain power to move the trolley group. After moving one end distance, the accumulation wheels on the other trolley groups drive away from the pressure rail and regain power. Then, they enter the other end of the circular track through the mechanical merging switch, and finally enter the movable section and are lowered by the elevator, forming a closed-loop conveying classification and caching strategy.

[0014] It can be seen from the above technical solution that the present invention has the following beneficial effects: 1. The present invention provides a modular suspended conveying system and conveying method with a classified caching function. A trolley group carrying materials is put on or off the line through an elevator. A circular track serves as the main path for the trolley group to convey materials. Several cache area tracks connected to the circular track form multiple cache areas. Trolley groups loaded with different materials are respectively driven into different cache area tracks through pneumatic diversion switches, realizing classified caching and playing 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 the designated position through the cooperation of the accumulation wheel and the pressure rail. The accumulation needle of the rear group set at the rear end of the trolley group cooperates with the accumulation wheel of the rear vehicle to stop the rear vehicle, thereby realizing the accumulation of a single trolley group or multiple trolley groups. At the same time, the trolley group can regain power through the stop mechanism and drive out of the buffer area track.

[0016] 3. The present invention provides a modular suspended conveying system with a classified caching function. The circular track and the cache area track can be expanded and upgraded according to the development needs of production and logistics. At the same time, it 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 the components of the present invention allows users to assemble them flexibly and in a variety of ways according to their needs to meet different process requirements, and its adaptability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a modular hanging conveying system with a classification caching function according to the present invention; Figure 2 This is a schematic structural diagram of the upper side of the pneumatic diverter turnout according to the present invention; Figure 3 This is a schematic structural diagram of the lower side of the pneumatic diverter turnout according to the present invention; Figure 4 This is a schematic structural diagram of the upper side of the mechanical merging turnout according to the present invention; Figure 5 This is a schematic structural diagram of the lower side of the mechanical merging turnout according to the present invention; Figure 6 This is a schematic structural diagram of the trolley group of the present invention; Figure 7 This is a schematic structural diagram of the vehicle group according to the present invention; Figure 8 This is a perspective structural diagram of the vehicle group according to the present invention; Figure 9 This is a schematic diagram of the parking state of the trolley group according to the present invention; Figure 10 for Figure 9 A in the middle is an enlarged schematic diagram; Figure 11 for Figure 9 The enlarged schematic diagram of point B in the middle; Figure 12 for Figure 9 Enlarged schematic diagram at point C in the middle; Figure 13 It is a structural schematic diagram of the stopping mechanism of the present invention; Figure 14 It is a structural schematic diagram of the elevator described in the present invention.

[0019] In the figure: 1-circular track, 11-90° curved track, 12-movable segment; 2- cache track; 3-trolley group, 31-fixed beam, 32-hanging device, 33-carriage body, 34-travel wheel, 35-guide wheel, 36-driving block, 361-guide shaft, 362-disengagement shaft, 363-accumulation wheel, 364-spring, 37-load-bearing shaft, 38-transition beam, 39-rear car group accumulation needle; 5- drive motor; 6-hoist, 61-frame, 62-cantilever mechanism, 63-counterweight assembly, 64-belt; 7- pneumatic shunt turnout, 71- housing 1, 72- cylinder, 73- turnout block 1, 74- rotating shaft 1; 8-Mechanical merging turnout, 81-Housing 2, 82-Return spring, 83-Turnout block 2, 84-Rotating shaft 2; 91-rail pressing, 92-bracket, 93-transverse cylinder, 94-stop rail pressing. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] like Figure 1-5 The figure shows a modular overhead conveying system with a classified caching function, comprising: a circular track 1, a plurality of cache area tracks 2, and a trolley group 3. Both ends of the cache area tracks 2 are connected to the circular track 1, and the trolley group 3 can slide on the circular track 1 and the cache area tracks 2. The number and length of the cache area tracks 2 can be changed according to actual needs. The circular track 1 and the buffer track 2 are both provided with a plurality of drive units, each of which includes an endless belt and a drive motor 5 for driving the endless belt. The endless belt is connected to the trolley group 3 to drive the trolley group 3 to slide. The various drive units are tightly connected to form a complete and continuous drive structure for the trolley group 3. The circular track 1 is provided with a hoist 6. The circular track 1 on the left side of the hoist 6 is connected to the buffer track 2 via a pneumatic diversion switch 7, and the circular track 1 on the right side is connected to the buffer track 2 via a mechanical merging switch 8. The pneumatic diverter switch 7 includes a housing 71, a cylinder 72 and a switch block 73 respectively provided on the upper and lower sides of the housing 71. A rotating shaft 74 is rotatably provided 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 via a connecting rod. Before the trolley group 3 enters the buffer track 2, the cylinder 72 drives the rotating shaft 74 to connect the switch block 73 with the designated buffer track 2, and the trolley enters through the pneumatic diverter switch 7. The mechanical merging switch 8 comprises a second housing 81, a return spring 82 and a second switch block 83, respectively, located on the upper and lower sides of the second housing 81. A second shaft 84 is rotatably mounted on the second housing 81. One end of the second shaft 84 is connected to the second switch block 83, and the other end is connected to the return spring 82 via a connecting rod. Under normal operation, the second switch block 83 maintains contact with the buffer track 2, allowing the trolley set 3 to exit the buffer track 2 smoothly. When the trolley set 3 passes through the mechanical merging switch 8 on the circular track 1, the front end of the trolley set 3 strikes the second switch block 83, causing it to connect with the circular track 1, allowing the trolley set 3 to pass smoothly. After the trolley set 3 passes, the second switch block 83 returns to its original position due to the action of the return spring 82. The mechanical merging switch 8 is only suitable for lightly loaded trolley sets 3. Impacts from heavily loaded trolley sets 3 can easily cause the second switch block 83 to become stuck. Therefore, in heavy-load situations, a pneumatic merging switch can be used as an alternative.

[0022] like Figure 6-8 The trolley group 3 includes at least one set of traveling units, a fixed beam 31 and a hanger 32 connected to the traveling unit through the fixed beam 31; the shape of the hanger 32 can be determined according to the shape of the article, and can be in the form of a hanging basket, a hanging rod, etc.; Each group of the traveling units includes a group of train sets, each of which includes a train body 33, running wheels 34 provided on the train body 33, guide wheels 35 provided under the train body 33, and a driving block 36 in frictional contact with the endless belt; the driving block 36 obtains power by contacting the endless belt, the running wheels 34 slide smoothly on the track, and the guide wheels 35 provide guidance for the train set to prevent derailment; in addition, the number of train sets can be increased or decreased according to the size of the load.

[0023] A load-bearing shaft 37 is rotatably provided on the vehicle body 33, and the other end of the load-bearing shaft 37 is rotatably connected to a transition beam 38, and the transition beam 38 is rotatably connected to the fixed beam 31; A rear vehicle group accumulation needle 39 is also provided on the transition beam 38 at the rear end.

[0024] The bottom surface of the drive block 36 is provided with a guide shaft 361 and a disengagement shaft 362. The disengagement shaft 362 is disposed through the vehicle body 33 and has an accumulation wheel 363 at its bottom. The disengagement shaft 362 is sleeved with a spring 364 that supports the drive block 36 in contact with the endless belt. The other end of the guide shaft 361 is plugged into the vehicle body 33. The spring 364 is in a compressed state. When the trolley group 3 is traveling, the upward force of the spring 364 pushes the drive block 36 upward, causing it to contact the endless belt.

[0025] Specifically, an accumulation mechanism is provided on the buffer area track 2, and the accumulation mechanism includes a pressure rail 91 with the same number of vehicle groups, and an upwardly inclined transition section is provided at both ends of the pressure rail 91. The position of the pressure rail 91 is lower than the accumulation wheel 363; It also includes a stopping mechanism arranged at the exit end of the cache area track 2, including a bracket 92 arranged on the cache area track 2, a transverse cylinder 93 is arranged on the bracket 92, the active end of the transverse crossbar 93 is connected to the movable plate, and the bottom of the movable plate is provided with a stopping pressure rail 94 with the same structure as the pressure rail 91.

[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 travels to the predetermined stop position, the accumulation wheels 363 on each car group on the trolley group 3 respectively enter the pressure rail 91 and the stop pressure rail 94. Since the heights of the pressure rail 91 and the stop pressure rail 94 are lower than the accumulation wheels 363, the accumulation wheels 363 will move down when entering, thereby moving the driving block 36 on the top of the disengagement shaft 362 downward, and the driving block 362 is disengaged from the endless belt and loses power, thereby stopping the trolley group 3, and the accumulation wheel 363 of the frontmost car group of the subsequent trolley group 3 enters the rear car group accumulation needle 39 on the previous trolley group 3, and the accumulation wheels 363 of the remaining car groups drive into the pressure rail 91 and also lose power and stop, so that multiple trolley groups 3 can be accumulated in sequence; When the trolley group 3 needs to move out of the buffer track 2, the transverse cylinder 93 on the stop mechanism drives the moving plate with the stop pressure rail 94 to move laterally away from the buffer track 2, and the accumulation wheel 363 cooperating with the stop pressure rail 94 is disengaged from it. Under the action of the spring 364, the drive block 36 is re-engaged with the endless belt, and the group obtains power to move the trolley group 3. After traveling a certain distance, the accumulation wheels 363 on the remaining groups are all driven away from the pressure rail 91 and released, and the entire trolley group 3 obtains power. And after the trolley group 3 moves, the accumulation pin 39 of the rear group at its tail is disengaged from the accumulation pin 363 at the front end of the rear trolley group 3, and the group at the front end obtains power. By analogy, the accumulation of the trolley group 3 on the entire buffer track 2 can be achieved.

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

[0028] Preferably, the annular belt is wound around a pulley and a tensioning pulley provided on the annular track 1 and the buffer zone 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 segment 12. The actuator end of the elevator 6 is connected to the movable segment 12 so that it can be vertically raised and lowered and docked or separated from the circular track 1. The elevator 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 further provided on the frame 61. The cantilever mechanism 62 and the counterweight assembly 63 are both connected to the belt 64. The cantilever mechanism 62 is connected to the movable segment 12.

[0030] A conveying method of an annular suspension conveying system, comprising: 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 so that it docks with the circular track 1; The trolley group 3 is driven along the circular track 1 to change the direction of travel of the trolley group 3 through the pneumatic diversion switch 7, and enters a different buffer zone track 2. The accumulating wheel 363 cooperates with the pressure rail 91 to make the trolley group 3 lose power, so that the trolley group 3 is stopped at the designated location for buffering; When it is necessary to take out items on the trolley group 3, the stop pressure rail 94 is driven by the transverse cylinder 93 to disengage it from the accumulation wheel 363 on a certain car group on the trolley group 3, and the driving block 36 rebounds and contacts the circular belt to obtain power to move the trolley group 3. After moving one end distance, the accumulation wheels 363 on other car groups drive away from the pressure rail 91 and regain power, and then enter the other end of the circular track 1 through the mechanical merging switch 8, and finally enter the movable section 12 and put it down through the elevator 6, forming a closed-loop conveying classification and caching strategy.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A modular hanging conveying system with classified caching function, characterized in that: include: A circular track (1), a plurality of buffer zone tracks (2) and a trolley group (3), wherein both ends of the buffer zone track (2) are connected to the circular track (1), and the trolley group (3) can slide on the circular track (1) and the buffer zone track (2); A plurality of drive units are provided on the annular track (1) and the buffer zone track (2), each of the drive units comprising an annular belt and a drive motor (5) for driving the annular belt, wherein the annular belt is connected to the trolley group (3) to drive the trolley group (3) to slide; The circular track (1) is provided with a hoist (6), the circular track (1) on the left side of the hoist (6) is connected to the buffer track (2) via a pneumatic shunt switch (7), and the circular track (1) on the right side is connected to the buffer track (2) via a mechanical merging switch (8); The pneumatic diverter turnout (7) comprises a housing (71), a cylinder (72) and a turnout block (73) respectively arranged on the upper and lower sides of the housing (71), a rotating shaft (74) rotatably arranged 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) via a connecting rod; The mechanical merging turnout (8) includes a second housing (81), a return spring (82) and a second turnout block (83) respectively arranged on the upper and lower sides of the second housing (81), and a second rotating shaft (84) rotatably arranged on the second housing (81), one end of the second rotating shaft (84) is connected to the second turnout block (83), and the other end is connected to the return spring (82) through a connecting rod.

2. A modular hanging conveying system with classified caching function according to claim 1, characterized in that: The trolley group (3) includes at least one set of traveling units, a fixed crossbeam (31), and a hanger (32) connected to the traveling units via the fixed crossbeam (31); Each group of the traveling units includes a group of vehicles, each group of vehicles includes a vehicle body (33), a traveling wheel (34) provided on the vehicle body (33), a guide wheel (35) provided below the vehicle body (33), and a driving block (36) in frictional contact with the endless belt; A load-bearing shaft (37) is rotatably provided on the vehicle body (33), the other end of the load-bearing shaft (37) is rotatably connected to a transition beam (38), and the transition beam (38) is rotatably connected to the fixed beam (31); A rear vehicle group accumulation needle (39) is also provided on the transition crossbeam (38) at the end of the tail.

3. A modular hanging conveying system with classified caching function according to claim 2, characterized in that: The bottom surface of the driving block (36) is provided with a guide shaft (361) and a disengagement shaft (362). The disengagement shaft (362) is arranged through the vehicle body (33). A accumulating wheel (363) is provided at the bottom thereof. A spring (364) supporting the driving block (36) to contact the endless belt is sleeved on the disengagement shaft (362). The other end of the guide shaft (361) is plugged into the vehicle body (33).

4. A modular hanging conveying system with classified caching function according to claim 3, characterized in that: An accumulation mechanism is provided on the buffer zone track (2), the accumulation mechanism comprising pressure rails (91) having the same number of vehicle groups, with upwardly inclined transition sections provided at both ends of the pressure rails (91), and the position of the pressure rails (91) being lower than the accumulation wheel (363); The invention also includes a stopping mechanism provided at the exit end of the buffer zone track (2), including a bracket (92) provided on the buffer zone track (2), a transverse cylinder (93) provided on the bracket (92), an active end of the transverse crossbar (93) connected to a movable plate, and a stop pressure rail (94) having the same structure as the pressure rail (91) provided at the bottom of the movable plate.

5. The modular hanging conveying system with classified caching function according to claim 1 is characterized in that: A 90° curved track (11) is provided at a corner of the annular track (1).

6. The modular hanging conveying system with classified caching function according to claim 1 is characterized in that: The annular belt is wound around a pulley and a tensioning pulley provided on the annular track (1) and the buffer zone track (2), and the pulley is connected to the output shaft of the drive motor (5).

7. The modular hanging conveying system with classified caching function according to claim 1 is characterized in that: A movable section (12) is provided on the annular track (1), and the execution end of the hoist (6) is connected to the movable section (12) so that the hoist (6) can be vertically lifted and lowered and docked with or separated from the annular track (1).

8. The modular hanging conveying system with classification and caching function according to claim 7 is characterized in that: The elevator (6) includes a frame (61), a cantilever mechanism (62) and a counterweight assembly (63) slidably arranged 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).

9. A conveying method for an annular suspension conveying system, implemented based on a modular suspension conveying system with a classification and caching function as claimed in any one of claims 1 to 8, 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) so that it is docked with the circular track (1); The trolley group (3) is driven along the circular track (1) to change the direction of travel of the trolley group (3) through the pneumatic diversion switch (7) and enter the different buffer area track (2). The trolley group (3) loses power through the cooperation of the accumulation wheel (363) and the pressure rail (91), so that the trolley group (3) is stopped at the designated position for buffering; When it is necessary to take out the items on the trolley group (3), the stop pressure rail (94) is driven by the transverse cylinder (93) to disengage it from the accumulation wheel (363) on a certain car group on the trolley group (3), and the driving block (36) rebounds and contacts the circular belt to obtain power to move the trolley group (3). After moving a certain distance, the accumulation wheels (363) on the other car groups leave the pressure rail (91) and regain power. Then, they enter the other end of the circular track (1) through the mechanical merging switch (8), and finally enter the movable section (12) to be lowered by the elevator (6), forming a closed-loop conveying classification and caching strategy.

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