Circular feeding device for circular materials

Abstract

The utility model provides a circular material circulation feeding device which comprises a bottom plate and a top plate, the bottom plate and the top plate are fixedly connected in parallel, an opening is formed in the top plate, and a feeding station is arranged at the opening. The conveying system is arranged on the bottom plate, a plurality of storage stations and a jacking station are arranged on the conveying system, each storage station corresponds to one tray, each jacking station corresponds to one tray, the conveying system comprises a pushing mechanism, and the pushing mechanism is used for pushing the trays on the storage stations to the jacking stations at the same time. The tray on the storage station closest to the jacking station enters the jacking station; the jacking system is arranged on the bottom plate, and the jacking system is used for jacking the tray located on the jacking station to the feeding station; and the discharging mechanism is arranged on the top plate, and the discharging mechanism is used for moving the trays on the feeding station to the recycling station. According to the utility model, continuous conveying and efficient recovery of the material trays are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of circular material feeding, and particularly relates to a circular material circulating feeding device. Background Art

[0002] In industrial production, the feeding devices for circular materials (such as dust covers, sealing rings, etc.) need to meet the requirements of high efficiency, continuity and versatility. Among them, the skeleton dust covers for air disc brake pistons are usually placed on corresponding trays, transported by the trays, and then clamped by a robotic arm. At present, tray transportation usually adopts belt or chain conveyors for transportation, and is clamped by a robotic arm after being transported to a specific station. After the materials on the tray are clamped, the tray needs to be recycled. If the above scheme is adopted, although continuous feeding can be ensured, the length of the entire feeding device is relatively long, the occupied area is large, and circular feeding cannot be achieved.

[0003] Therefore, there is an urgent need for a circular feeding device that combines high efficiency, continuity and versatility. Summary of the Utility Model

[0004] The purpose of the utility model is to aim at the defects of the prior art and provide a circular material circulating feeding device, which realizes the continuous transportation and efficient recycling of the material tray.

[0005] To solve the above technical problems, the utility model provides a circular material circulating feeding device, including:

[0006] A bottom plate and a top plate, the bottom plate and the top plate are fixedly connected in parallel, an opening is provided on the top plate, and the opening is the feeding station;

[0007] A conveying system, the conveying system is arranged on the bottom plate, multiple storage stations and one lifting station are arranged on the conveying system, each storage station corresponds to a tray, and one lifting station corresponds to a tray. The conveying system includes a pushing mechanism, and the pushing mechanism is used to simultaneously push the trays on multiple storage stations towards the lifting station, so that the tray on the storage station closest to the lifting station enters the lifting station;

[0008] A lifting system, the lifting system is arranged on the bottom plate, and the lifting system is used to lift the tray located at the lifting station to the feeding station;

[0009] A blanking mechanism, the blanking mechanism is arranged on the top plate, and the blanking mechanism is used to move the tray at the feeding station to the recycling station.

[0010] In some embodiments, the conveying system includes a conveying track disposed on a bottom plate and a plurality of pusher limiting mechanisms. The plurality of pusher limiting mechanisms are uniformly arranged along the conveying track. The pusher limiting mechanisms are located between two adjacent storage stations and between an adjacent storage station and a lifting station. The pusher mechanism is used to push the tray on the first storage station. The pusher limiting mechanism includes a pusher limiting drive mechanism and a pusher limiting plate. The pusher limiting drive mechanism is used to control the lifting of the pusher limiting plate, thereby realizing the limitation of the tray, and the pusher limiting mechanism is used to limit the pushing distance of the tray.

[0011] In some embodiments, the lifting system includes a lifting drive mechanism fixed on the bottom plate and a plurality of telescopic guide rods. The output end of the lifting drive mechanism is provided with a lifting plate. The upper ends of the telescopic guide rods are connected to the lifting plate, and a positioning member adapted to the tray is provided on the lifting plate.

[0012] In some embodiments, the lifting system includes a lifting limiting mechanism, and the lifting limiting mechanism is used to limit the lifting height of the tray.

[0013] In some embodiments, the lifting limiting mechanism includes a lifting limiting drive mechanism and a lifting limiting plate. The lifting limiting plate is slidably disposed on the top plate, and the lifting limiting drive mechanism is used to drive the lifting limiting plate to move towards the opening, thereby limiting the lifting height of the tray.

[0014] In some embodiments, the blanking mechanism includes a lifting servo mechanism and a transverse movement drive mechanism. The transverse movement drive mechanism is used to drive the lifting servo mechanism to slide on the top plate. The output end of the lifting servo mechanism is provided with a clamping jaw, and the clamping jaw is used to clamp the tray on the loading station.

[0015] In some embodiments, stacking columns are provided on the upper surface of the tray, and stacking holes are formed on the lower surface of the tray. A plurality of the trays can be stacked at the recycling station by using the stacking holes and the stacking columns.

[0016] In some embodiments, a recycling mechanism is provided on the top plate. The recycling mechanism includes a support mechanism and a sliding limiting mechanism. The sliding limiting mechanism is arranged on both sides of the support mechanism. The sliding limiting mechanism includes side limiting members and rollers mounted on the side limiting members. The side limiting members are used to limit the left and right sides of the tray. The support mechanism includes a support drive mechanism and a support plate. The support drive mechanism is used to control the lifting of the support plate, and the support plate is used to support the tray and limit the front and rear sides of the tray.

[0017] In some embodiments, a model detection unit is provided on the bottom plate. The model detection unit is disposed on one side of the conveying track, and the model detection unit is used to detect the tray model.

[0018] In some embodiments, a plurality of material transfer sensors are arranged on the bottom plate, and the plurality of material transfer sensors are respectively used to detect whether the trays at the storage station and the jacking station are in place. A feeding sensor is arranged on the top plate, and the feeding sensor is used to detect whether the tray at the feeding station is in place.

[0019] The beneficial effects of the present utility model are as follows:

[0020] 1. The pusher mechanism of the present utility model can push multiple trays simultaneously, enabling the tray at the storage station closest to the jacking station to enter the jacking station. After the tray enters the jacking station, it is jacked up to the feeding station by the jacking system. At this time, the robotic arm can grab the materials on the tray at the feeding station for feeding. After all the materials on the tray are grabbed, the blanking mechanism can move the empty tray to the recycling station, and the staff can recycle the tray at the recycling station and reload it, thus realizing cyclic feeding. Since the blanking mechanism is located on the top plate and the conveying system is located between the top plate and the bottom plate, the two do not interfere with each other. In addition, since the movement of multiple trays is achieved by pushing the first tray, the required length of the pusher drive mechanism can be reduced, which is beneficial to reducing the floor area of the entire feeding device.

[0021] 2. By arranging a plurality of pusher limiting mechanisms, the present utility model enables the trays to be precisely pushed to each storage station one by one.

[0022] 3. By arranging a jacking limiting mechanism, the present utility model ensures that the tray is precisely jacked up to the feeding station, enabling the robotic arm to precisely grab the materials on the tray.

[0023] 4. By arranging a blanking mechanism, the present utility model can recycle the empty tray from above the top plate, realizing the recycling of the tray.

[0024] 5. By arranging a recycling device, when stacking trays, the support drive mechanism jacks up the support plate so that it is higher than the rollers on the side limit member. After the blanking mechanism grabs and moves the tray above the recycling mechanism and then lowers it onto the support plate, the support plate and the side limit member can limit the tray. Multiple trays can be stacked in the height direction. When stacking is impossible or the trays need to be removed, the support drive mechanism lowers the support plate, causing the multiple trays to fall onto the rollers of the side limit member. At this time, the staff can draw out the multiple trays along the rollers to complete the recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present utility model;

[0026] Figure 2 is a schematic structural diagram of another perspective of the present utility model;

[0027] Figure 3Schematic structural diagram of the conveying system of the present utility model;

[0028] Figure 4 Schematic structural diagram of the present utility model's conveying system during material pushing;

[0029] Figure 5 is Figure 4 Enlarged view of part A in

[0030] Figure 6 is Figure 4 Enlarged view of part B in

[0031] Figure 7 Schematic structural diagram of the lifting system of the present utility model;

[0032] Figure 8 Schematic structural diagram of the recycling mechanism of the present utility model;

[0033] Figure 9 Schematic structural diagram of the blanking mechanism of the present utility model;

[0034] Figure 10 Schematic structural diagram of the tray of the present utility model;

[0035] Figure 11 Schematic structural diagram of the trays of the present utility model when stacked.

[0036] Reference numerals: bottom plate 1; top plate 2; opening 21; conveying system 3; conveying track 31; pusher limit mechanism 32; pusher drive mechanism 33; push plate 34; baffle plate 35; lifting system 4; lifting drive mechanism 41; telescopic guide rod 42; lifting plate 43; positioning member 44; lifting limit drive mechanism 45; lifting limit plate 46; blanking mechanism 5; lifting servo mechanism 51; crosswise drive mechanism 52; clamping cylinder 53; clamping member 54; tray 6; limit groove 61; stacking column 62; stacking hole 63; model hole 64; clamping groove 65; model detection unit 71; material transfer sensor 72; loading sensor 73; recycling mechanism 8; side limit member 81; support drive mechanism 82; support plate 83; Detailed implementation manners

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] As Figure 1 、 2 shown, the present utility model provides a circular material circulating loading device, including:

[0039] A bottom plate 1 and a top plate 2, with multiple columns arranged between the bottom plate 1 and the top plate 2. The bottom plate 1 and the top plate 2 are fixedly connected in parallel through the columns. An opening 21 is provided on the top plate 2, and the opening 21 is the loading station.

[0040] A conveying system 3, which is arranged on the bottom plate 1. The conveying system 3 is located between the bottom plate 1 and the top plate 2. Multiple storage stations and one lifting station are arranged on the conveying system 3. Each storage station corresponds to a tray 6, and one lifting station corresponds to a tray 6. The conveying system 3 includes a pushing mechanism for simultaneously pushing the trays 6 on multiple storage stations towards the lifting station, so that the tray 6 on the storage station closest to the lifting station enters the lifting station. As Figure 3 shown, the pushing mechanism includes a pushing drive mechanism 33 and a push plate 34. The pushing drive mechanism 33 is used to control the push plate 34 to push one or more trays 6 towards the lifting station. The pushing drive mechanism 33 uses a cylinder.

[0041] A lifting system 4, which is arranged on the bottom plate 1. The lifting system 4 is used to lift the tray 6 located at the lifting station to the loading station.

[0042] A discharging mechanism 5, which is arranged on the top plate 2. The discharging mechanism 5 is used to move the tray 6 at the loading station to the recycling station.

[0043] It can be understood that the pushing mechanism can simultaneously push multiple trays 6, so that the tray 6 on the storage station closest to the lifting station enters the lifting station. After the tray 6 enters the lifting station, it is lifted to the loading station by the lifting system 4. At this time, the robotic arm can grasp the materials on the tray 6 at the loading station for loading. After all the materials on the tray 6 are grasped, the discharging mechanism 5 can move the empty tray 6 to the recycling station, and the staff can recycle and reload the tray 6 at the recycling station, thus realizing cyclic loading. Since the discharging mechanism 5 is located on the top plate 2 and the conveying system 3 is located between the top plate 2 and the bottom plate 1, the two do not interfere with each other. In addition, since the movement of multiple trays 6 is achieved by pushing the first tray 6, the required length of the pushing drive mechanism 33 can be reduced, which is beneficial to reducing the floor area of the entire loading device. For example Figure 4 shown, if two storage stations and one lifting station are set, and the lifting station is located at the leftmost side. At this time, there are trays 6 on both storage stations. Only need to push the tray 6 on the right storage station to the left storage station, and the tray 6 on the left storage station will be pushed to the lifting station to the left. The pushing distance of the pushing drive mechanism 33 is equal to the width of one tray 6.

[0044] As Figure 10As shown in the figure, stacking columns 62 are provided on the upper surface of the tray 6, stacking holes 63 are formed on the lower surface of the tray 6, and multiple trays 6 can be stacked at the recycling station by using the stacking holes 63 and the stacking columns 62. A limiting groove 61 and a clamping groove 65 are formed on the side surface of the tray 6, and positioning holes are formed on the lower surface of the tray 6. As Figure 5 shown, a model number hole 64 is also formed on the side surface of the tray 6.

[0045] As Figure 3 shown, the conveying system 3 includes a conveying track 31 and multiple pushing and limiting mechanisms 32 provided on the bottom plate 1. Two conveying tracks 31 are arranged in parallel, multiple rollers are provided on the conveying track 31, and multiple pushing and limiting mechanisms 32 are uniformly arranged along the conveying track 31 ( Figure 3 two are schematically shown in the figure). The pushing and limiting mechanisms 32 are located between adjacent two storage stations and between adjacent storage stations and lifting stations. The pushing mechanism is used to push the tray 6 on the first storage station. The pushing and limiting mechanism 32 includes a pushing and limiting driving mechanism and a pushing and limiting plate. The pushing and limiting plate is used to cooperate with the limiting groove 61 of the tray 6, and the pushing and limiting driving mechanism is used to control the lifting of the pushing and limiting plate, so as to realize the limiting of the tray 6. The pushing and limiting mechanism 32 is used to limit the pushing distance of the tray 6. As Figure 6 shown, a baffle 35 is provided on the side of the lifting station away from the storage station. Buffer pads can be provided on both the baffle 35 and the pushing and limiting plate.

[0046] It can be understood that before the first tray 6 is placed in the first storage station, the pushing and limiting mechanism 32 close to the pushing plate 34 should be lifted to prevent the first tray 6 from sliding towards the second storage station, resulting in the relevant sensors being unable to detect the tray 6. After the first tray 6 is placed, when the first tray 6 is pushed to the front of the second storage station by the pushing mechanism, the pushing and limiting mechanism 32 away from the pushing plate 34 should be lifted to prevent the tray 6 from rushing towards the lifting station and causing an impact.

[0047] As Figure 6 、 7 shown, the lifting system 4 includes a lifting driving mechanism 41 fixed on the bottom plate 1 and multiple telescopic guide rods 42. The output end of the lifting driving mechanism 41 is provided with a lifting plate 43. The upper ends of the telescopic guide rods 42 are connected to the lifting plate 43. A positioning member 44 cooperating with the tray 6 is provided on the lifting plate 43. The positioning member 44 cooperates with the positioning holes on the lower surface of the tray 6 to ensure the limiting of the tray 6. The lifting driving mechanism 41 can adopt a cylinder, and the telescopic guide rod 42 can adopt a structure of a sleeve rod and a telescopic rod. The sleeve rod is fixed on the bottom plate 1, the telescopic rod is slidably arranged in the sleeve rod, and one end thereof passes through the bottom plate 1 and is fixedly connected to the lifting plate 43.

[0048] As Figure 7As shown in the figure, the jacking system 4 includes a jacking limit mechanism, which is used to limit the jacking height of the tray 6. Two jacking limit mechanisms are symmetrically arranged on both sides of the opening 21 of the top plate 2 respectively. The jacking limit mechanism includes a jacking limit driving mechanism 45 and a jacking limit plate 46. The jacking limit plate 46 is slidably arranged on the top plate 2 through a track. The jacking limit driving mechanism 45 is used to drive the jacking limit plate 46 to move towards the opening 21, so as to limit the jacking height of the tray 6, as Figure 2 shown

[0049] The blanking mechanism 5 includes a lifting servo mechanism 51 and a transverse movement driving mechanism 52, as Figure 2 shown. The lifting servo mechanism 51 is arranged on the gantry, and the gantry is slidably connected to the top plate 2 through a track, Figure 2 only part of the track is shown in the figure, as Figure 3 shown. The transverse movement driving mechanism 52 is arranged on the bottom plate 1 through a bracket. The transverse movement driving mechanism 52 is used to drive the lifting servo mechanism 51 to slide on the top plate 2, as Figure 9 shown. A clamping jaw is arranged at the output end of the lifting servo mechanism 51, and the clamping jaw is used to clamp the tray 6 at the loading station. Two clamping jaws are symmetrically arranged. The clamping jaw includes a clamping cylinder 53 and a clamping member 54, and the clamping member 54 is used to cooperate with the clamping groove 65 on the tray 6.

[0050] As Figure 8 shown, a recycling mechanism 8 is arranged on the top plate 2. The position of the recycling mechanism 8 corresponds to the recycling station. The recycling mechanism 8 is located below the lifting servo mechanism 51. The recycling mechanism 8 includes a support mechanism and a sliding limit mechanism. The sliding limit mechanism is arranged on both sides of the support mechanism. The sliding limit mechanism includes side limit members 81 and rollers installed on the side limit members 81. The side limit members 81 are used to limit the left and right sides of the tray 6. The support mechanism includes a support driving mechanism 82 and a support plate 83. The support driving mechanism 82 is used to control the lifting of the support plate 83, and the support plate 83 is used to support the tray 6 and limit the front and rear sides of the tray 6. The support driving mechanism 82 can adopt a cylinder.

[0051] It can be understood that when stacking the trays 6, the support driving mechanism 82 jacks up the support plate 83 to make it higher than the rollers on the side limit members 81. The blanking mechanism 5 grabs and moves the tray 6 above the recycling mechanism 8 and then lowers it onto the support plate 83. The support plate 83 and the side limit members 81 can limit the tray 6. Multiple trays 6 can be stacked in the height direction, as Figure 11 shown. When stacking to the point where stacking is no longer possible or when it is necessary to remove the trays, the support driving mechanism 82 lowers the support plate 83, so that multiple trays 6 fall onto the rollers of the side limit members 81. At this time, the staff can draw out multiple trays 6 along the rollers to complete the recycling.

[0052] As Figure 3As shown in the figure, a model detection unit 71 is provided on the bottom plate 1. The model detection unit 71 is arranged on one side of the conveying track 31 and is used to detect the model of the tray 6 according to the model holes 64 on the tray 6. When the model of the tray 6 is incorrect, an alarm can be issued to prevent the tray 6 with an incorrect model from being pushed into the next storage station, which is inconvenient to pick up and affects work efficiency.

[0053] As Figure 3 shown in the figure, a plurality of material transfer sensors 72 are also provided on the bottom plate 1. The plurality of material transfer sensors 72 are respectively used to detect whether the trays 6 at the storage station and the lifting station are in place. As Figure 7 shown in the figure, a feeding sensor 73 is provided on the top plate 2, and the feeding sensor 73 is used to detect whether the tray 6 at the feeding station is in place.

[0054] The working process of the circular material circulating feeding device is as follows:

[0055] As Figure 3 shown in the figure, the right push limit plate is raised, and the staff places the first tray 6 loaded with circular materials on the right storage station. The right push limit plate can limit the tray 6 to prevent it from sliding forward. The model detection unit 71 is used to detect the model of the tray 6 according to the model holes 64 on the tray 6. Figure 3 After the rightmost material transfer sensor 72 in the figure detects the tray 6, the right push limit plate is lowered, the left push limit plate is raised, and the push driving mechanism 33 controls the push plate 34 to push the first tray 6 to the left storage station. At this time, the left push limit plate can limit the tray 6 to prevent it from sliding forward; the push driving mechanism 33 controls the push plate 34 to return to its original position;

[0056] Then, the second tray 6 loaded with circular materials is placed on the right storage station. After the model is detected correctly, Figure 3 the rightmost material transfer sensor 72 in the figure detects the second tray 6, the left push limit plate is lowered, and the push driving mechanism 33 controls the push plate 34 to push the second tray 6 to the left storage station. The first tray 6 is then pushed to the lifting station; the left push limit plate is raised;

[0057] After the material transfer sensor 72 at the lifting station detects the tray 6, as Figure 7 shown in the figure, the lifting driving mechanism 41 uses the lifting plate 43 to lift the tray 6, and the lifting limit driving mechanism 45 controls the lifting limit plate 46 to move towards the opening 21. The tray 6 rises above the opening 21 and is restricted in height by the two lifting limit plates 46; at this time, the robotic arm can grasp the materials on the tray 6.

[0058] After all the materials on the tray 6 are grabbed, the lateral translation drive mechanism 52 controls the lifting servo mechanism 51 to move towards the opening 21. After the lifting servo mechanism 51 moves to the preset position, it controls the gripper to descend. The gripper grabs the tray 6, the lifting servo mechanism 51 controls the gripper to rise, and the lateral translation drive mechanism 52 controls the lifting servo mechanism 51 to move towards the initial position. The lifting servo mechanism 51 controls the gripper to descend onto the support plate 83, and the gripper cancels the grasping of the tray 6. At this time, the recycling of one tray 6 is completed. The subsequent trays 6 can be stacked on the first tray 6 until they cannot be stacked or need to be removed. The support drive mechanism 82 lowers the support plate 83, causing multiple trays 6 to fall onto the rollers of the side limit member 81. At this time, the staff can pull out multiple trays 6 along the rollers to complete the recycling. The recycled empty trays 6 can be loaded with materials and placed back into the storage station, thus realizing cyclic feeding.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A circular material circulating feeding device, characterized in that, Including: A bottom plate (1) and a top plate (2), the bottom plate (1) and the top plate (2) are fixedly connected in parallel, an opening (21) is formed on the top plate (2), and the opening (21) is the loading station; A conveying system (3), the conveying system (3) includes a pusher mechanism, a conveying track (31) and a plurality of pusher limiting mechanisms (32) arranged on the bottom plate (1), a plurality of storage stations and a lifting station are arranged on the conveying system (3), each storage station corresponds to a tray (6), and one lifting station corresponds to a tray (6). The pusher mechanism is used to push the tray (6) on the first storage station and push the trays (6) on a plurality of storage stations towards the lifting station at the same time, so that the tray (6) on the storage station closest to the lifting station enters the lifting station; the pusher limiting mechanism (32) is located between two adjacent storage stations and between the adjacent storage station and the lifting station, and the pusher limiting mechanism (32) is used to limit the pushing distance of the tray (6); A lifting system (4), the lifting system (4) is arranged on the bottom plate (1), and the lifting system (4) is used to lift the tray (6) located at the lifting station to the loading station; A blanking mechanism (5), the blanking mechanism (5) is arranged on the top plate (2), and the blanking mechanism (5) is used to move the tray (6) on the loading station to the recycling station.

2. The circular material recycling feeding device according to claim 1, wherein, A plurality of the pusher limiting mechanisms (32) are uniformly arranged along the conveying track (31), and the pusher limiting mechanism (32) includes a pusher limiting driving mechanism and a pusher limiting plate. The pusher limiting driving mechanism is used to control the lifting of the pusher limiting plate, so as to realize the limiting of the tray (6).

3. The circular material circulating feeding device according to claim 1, characterized in that The lifting system (4) includes a lifting driving mechanism (41) fixed on the bottom plate (1) and a plurality of telescopic guide rods (42). The output end of the lifting driving mechanism (41) is provided with a lifting plate (43). The upper end of the telescopic guide rod (42) is connected to the lifting plate (43), and a positioning member (44) cooperating with the tray (6) is arranged on the lifting plate (43).

4. The circular material circulating feeding device according to claim 1, characterized in that, The lifting system (4) includes a lifting limiting mechanism, and the lifting limiting mechanism is used to limit the lifting height of the tray (6).

5. The circular material recycling feeding device according to claim 4, wherein The lifting limiting mechanism includes a lifting limiting driving mechanism (45) and a lifting limiting plate (46). The lifting limiting plate (46) is slidably arranged on the top plate (2), and the lifting limiting driving mechanism (45) is used to drive the lifting limiting plate (46) to move towards the opening (21), so as to limit the lifting height of the tray (6).

6. The circular material circulating feeding device according to any one of claims 1 to 5, characterized in that, The blanking mechanism (5) includes a lifting servo mechanism (51) and a transverse movement driving mechanism (52). The transverse movement driving mechanism (52) is used to drive the lifting servo mechanism (51) to slide on the top plate (2), and a clamping jaw is arranged at the output end of the lifting servo mechanism (51), and the clamping jaw is used to clamp the tray (6) on the loading station.

7. The circular material circulating feeding device according to any one of claims 1 to 5, characterized in that, The upper surface of the tray (6) is provided with stacking columns (62), and the lower surface of the tray (6) is provided with stacking holes (63). A plurality of the trays (6) can be stacked at the recycling station by using the stacking holes (63) and the stacking columns (62).

8. The circular material circulating feeding device according to any one of claims 1 to 5, characterized in that A recycling mechanism (8) is provided on the top plate (2). The recycling mechanism (8) includes a support mechanism and a sliding limit mechanism. The sliding limit mechanism is arranged on both sides of the support mechanism. The sliding limit mechanism includes side limit members (81) and rollers mounted on the side limit members (81). The side limit members (81) are used to limit the left and right sides of the tray (6). The support mechanism includes a support driving mechanism (82) and a support plate (83). The support driving mechanism (82) is used to control the lifting of the support plate (83), and the support plate (83) is used to support the tray (6) and limit the front and rear sides of the tray (6).

9. The circular material circulating feeding device according to any one of claims 1 to 5, characterized in that A model detection unit (71) is provided on the bottom plate (1). The model detection unit (71) is arranged on one side of the conveying track (31). The model detection unit (71) is used to detect the model of the tray (6).

10. The circular material circulating feeding device according to any one of claims 1 to 5, characterized in that, A plurality of material transfer sensors (72) are provided on the bottom plate (1). The plurality of material transfer sensors (72) are respectively used to detect whether the trays (6) at the material storage station and the jacking station are in place. An upper feeding sensor (73) is provided on the top plate (2). The upper feeding sensor (73) is used to detect whether the tray (6) at the upper feeding station is in place.

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