A ring body feeding device

Abstract

The utility model relates to material handling technical field, concretely relates to a ring body feeding device. Ring body feeding device includes main platform, is equipped with the storage mechanism on the main platform, is movably equipped with the receiving table under the main platform, is equipped with the blanking avoidance mouth on the main platform, and the receiving table is equipped with the sheltering part to be used for sheltering blanking avoidance mouth, and the storage mechanism includes spacing core body and core body fixed structure, and spacing core body is adapted to the ring body and is set up to the ring body of stacking is positioned, and spacing core body is suspended downward to the ring body along spacing core body and falls to the receiving structure through blanking avoidance mouth, and spacing core body satisfies the clearance fit with ring body, and the maximum clearance between spacing core body and ring body is less than ring body line diameter. Limiting from ring body inside to outside with spacing core body, the ring body above does not easily squeeze into the clearance between ring body below and spacing core body, and the ring body is automatically righted on spacing core body, avoids the ring body posture improper and appears the jam situation when feeding.

Description

Technical Field

[0001] This utility model relates to the field of material handling technology, specifically to a ring-shaped feeding device. Background Technology

[0002] Chinese utility model patent CN221758842U discloses a ring feeding device for simultaneously feeding a set of inner and outer rings of a basketball hoop. The set of inner and outer rings includes an outer ring and an inner ring arranged coaxially. Both the outer ring and the inner ring are rings. The outer ring has a larger diameter, i.e., it is a large ring, and the inner ring has a smaller diameter, i.e., it is a small ring. The feeding device simultaneously places the coaxial outer ring and inner ring to the corresponding welding station for subsequent operations of welding connecting rods to the outer ring and the inner ring.

[0003] The aforementioned ring feeding device includes a frame, a storage mechanism, a receiving platform, and a transferring mechanism. The frame includes a main frame and a main platform mounted on the main frame. The storage mechanism is located on the upper side of the main platform, and the receiving platform is movably located on the lower side of the main platform. The storage mechanism has a ring limiting structure for limiting the stacked rings. The receiving platform is equipped with a receiving structure, and the main platform has a discharge port on which the rings fall from the ring limiting structure to the receiving structure when the receiving structure and the ring limiting structure are aligned vertically. The system includes a loading area where the receiving structure protrudes from the main platform. The storage mechanism has two ring-shaped limiting structures, one for the outer ring and one for the inner ring. The main platform has two corresponding drop-off clearance openings. The receiving structure has ring-shaped receiving grooves for receiving the rings; the outer and inner rings each have their own corresponding grooves, which are coaxially arranged. The receiving platform, during its travel, has picking positions that align each ring-shaped receiving groove with the drop-off clearance opening, and loading positions that align the receiving structure with the loading area. The transfer mechanism is a robotic arm, which can move a set of outer and inner rings to the corresponding welding station in one operation.

[0004] The material storage mechanism of the aforementioned ring feeding device includes three uprights set around the material discharge clearance opening. The lower ends of the uprights are fixed to the main platform. The three uprights form a ring material bin. Multiple rings can be stacked in the ring material bin in the vertical direction. The three uprights located around the ring form a ring limiting structure, and the uprights limit the outer edge of the ring.

[0005] However, problems still arose during actual production. Because the uprights needed to maintain a certain distance from the ring to ensure its smooth descent, and the lateral dimension of the area enclosed by each upright was larger than the outer diameter of the ring, the uprights did not clamp the ring but rather had a gap fit. Due to this gap, the ring would have a certain amount of offset, resulting in misalignment and non-axisymmetry between the rings. When a certain number of rings accumulated, this misalignment became more pronounced and continued to accumulate; it did not decrease as the rings descended. Furthermore, the more rings accumulated, the greater the pressure on the bottom rings. The ring itself is elastic, especially when the ring diameter is small and the outer diameter is large, it is more easily deformed by compression. It can deform into an elliptical shape through the space between the uprights, widening the gap between it and one of the uprights. This combination of factors means that in two adjacent rings that are significantly misaligned, the misaligned portion of the upper ring relative to the lower ring is easily squeezed downwards into the gap between the lower ring and the upright under the pressure from above. This causes the uprights of the two rings to be squeezed together laterally, increasing the resistance to the ring's descent and easily causing it to jam, affecting the smooth feeding of the ring. Furthermore, due to the large internal space of the hopper, the ring is prone to tilting when being placed in, requiring straightening to prevent misalignment and jamming. Utility Model Content

[0006] The purpose of this utility model is to provide a ring feeding device to solve the problem that the current feeding device, which uses multiple uprights to form a hopper to limit the ring, is prone to jamming due to ring misalignment.

[0007] The technical solution of the ring feeding device of this utility model is as follows: A ring feeding device includes a frame, a main platform, a storage mechanism on the main platform, a receiving platform movably mounted on the lower side of the main platform, a receiving structure on the receiving platform, a drop clearance opening on the main platform, and a blocking part on the receiving platform to block the drop clearance opening when it is misaligned with the receiving structure. The storage mechanism includes a limiting core and a core fixing structure. The limiting core is adapted to fit the rings to limit the stacking of rings. The bottom of the core fixing structure is fixed to the main platform, and the top of the limiting core is fixed to the core fixing structure and extends downward so that the rings fall through the limiting core and the drop clearance opening to the receiving structure. The limiting core is clearance-fitted with the rings, and the maximum gap between the limiting core and the rings is less than the wire diameter of the rings.

[0008] Furthermore, the limiting core includes three or more limiting rods distributed circumferentially, and in use, the ring is fitted around the outer space of the area enclosed by each limiting rod.

[0009] Furthermore, the limiting core includes a lower fixing body fixed to the lower end of each limiting rod and / or an upper fixing body fixed to the lower end of each limiting rod.

[0010] Furthermore, the upper fixed body is a disc with multiple through holes around its center line, and the upper ends of each limiting rod are fixed to the outer edge of the disc; the lower fixed body is a ring with the lower ends of each limiting rod fixed to the outer edge of the ring.

[0011] Furthermore, the limiting core is a cylinder with an outer peripheral surface.

[0012] Furthermore, there are at least two types of limiting cores, namely a large-circle limiting core and a small-circle limiting core; the large-circle limiting core includes three or more limiting rods distributed circumferentially, and the ring is fitted around the outer space of the area enclosed by each limiting rod when in use; the small-circle limiting core is a column with an outer circumferential surface; the main platform is provided with a material drop clearance opening corresponding to each limiting core, and the receiving structure has ring receiving slots for each ring corresponding to each material drop clearance opening to adapt to receiving the corresponding ring, and the receiving platform has each picking position corresponding to each ring receiving slot and the material drop clearance opening during its movement stroke, as well as a loading position for the receiving structure to expose the ring from the main platform.

[0013] Furthermore, the core fixing structure includes a fixed column and a top bracket. The bottom of the fixed column is fixed to the main platform, and the top bracket is installed on the top of the fixed column. The top of the limiting core is detachably connected to the top bracket.

[0014] Furthermore, the fixed column and the top bracket can be detachably and fixedly connected; or there are two fixed columns, with one end of the top bracket hinged to the top of one of the fixed columns and the other end detachably and fixedly connected to the top of the other fixed column.

[0015] Furthermore, the lower end of the limiting core extends into the material discharge clearance opening and does not contact the receiving platform during material feeding.

[0016] Furthermore, both the upper and lower ends of the limiting core are designed to allow the supply ring to be fitted onto it from the corresponding ends.

[0017] Beneficial Effects: This utility model modifies existing ring feeding devices by using a limiting core to restrict movement from the inside to the outside of the ring. The rings are stacked on the limiting core, with rings arranged sequentially. During feeding, the rings fall along the limiting core, pass through the discharge clearance on the main platform, and enter the corresponding receiving structure on the receiving platform. Due to the gap fit between the limiting core and the ring, the rings fall autonomously under their own weight. Simultaneously, the maximum gap between the limiting core and the ring is required to be less than the ring's wire diameter. This prevents the rings from falling due to the gap between them. When the rings are misaligned, due to the small gap and the fact that the upper ring experiences greater pressure relative to the lower ring, causing the misaligned portion to press against the gap between the lower ring and the limiting core, the misaligned portion of the lower ring experiences an outward expansion force rather than an inward contraction force. The ring has strong resistance to deformation under outward expansion force, and the limiting core can restrict the deformation of the ring. Therefore, the upper ring is not easily squeezed into the gap between the lower ring and the limiting core, thus preventing jamming due to misalignment. Moreover, when placing the rings, the rings automatically straighten themselves when placed on the limiting core, avoiding jamming during material loading due to improper ring posture. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the ring feeding device of this utility model; Figure 2 for Figure 1 A schematic diagram of the ring feeding device when the ring is loaded; Figure 3 for Figure 1 A schematic diagram of the receiving platform in the middle; Figure 4 for Figure 1 A schematic diagram of the material storage mechanism in the middle; Figure 5 for Figure 4 A schematic diagram of the storage mechanism when it is open; Figure 6 for Figure 5 A schematic diagram of the storage mechanism in the middle when it is equipped with a ring body; Figure 7 for Figure 5 A schematic diagram showing the connection between the top support and the fixed column.

[0019] In the diagram: 100, large circle; 200, small circle; 1, main platform; 11, large circle clearance hole; 12, small circle clearance hole; 13, loading clearance hole; 2, main frame; 3, material storage mechanism; 31, large circle limiting core; 311, limiting rod; 312, fixing plate; 313, fixing ring; 32, small circle limiting core; 33, fixing column; 34, top support; 4, receiving platform; 41, small circle receiving groove; 42, large circle receiving groove. Detailed Implementation

[0020] The basic concept of the ring feeding device of this utility model is to use a limiting core to limit the ring from the inside to the outside, thereby enhancing the ring's resistance to deformation when squeezed due to misalignment. The ring is automatically straightened when it is placed on the limiting core, which can prevent jamming during ring feeding.

[0021] The following is a detailed description of the embodiment of the ring feeding device of this utility model: The ring feeding device in this embodiment is used for simultaneously feeding a set of inner and outer rings of the basketball hoop. A set of inner and outer rings includes an outer ring and an inner ring arranged coaxially. Both the outer and inner rings are ring bodies. The feeding device in this embodiment simultaneously places the coaxial outer and inner rings to the corresponding welding stations for subsequent welding of the connecting rods to the outer and inner rings. In other words, the feeding device in this embodiment is used for feeding a set of inner and outer rings before the welding process. The specific structure of the basketball hoop can be found in the patent documents cited in the background section.

[0022] To facilitate understanding of the features of this utility model, the following is combined with... Figure 1 , Figure 2 , Figure 3 The main structure of the ring feeding device is described in basic terms. The device includes a frame, a storage mechanism 3, a receiving platform 4, and a transfer mechanism. The frame includes a main frame 2 and a main platform 1 mounted on the main frame 2. The storage mechanism 3 is located on the upper side of the main platform 1, and the receiving platform 4 is movably located on the lower side of the main platform 1. The storage mechanism 3 has a ring-limiting structure for limiting the stacked rings. The receiving platform 4 has a receiving structure. The main platform 1 has a discharge port on which the rings fall from the ring-limiting structure to the receiving structure when the receiving structure and the ring-limiting structure are aligned vertically. The frame has a receiving structure. From the feeding area exposed on the main platform 1, in this embodiment, it is used for feeding an outer ring and an inner ring of the basketball hoop. The outer ring is the large ring 100, and the inner ring is the small ring 200. Therefore, the storage mechanism 3 has two ring limiting structures. The main platform 1 is provided with two corresponding material dropping clearance openings. The receiving structure has ring receiving grooves for receiving the rings. The large ring 100 and the small ring 200 are respectively provided with ring receiving grooves. The two ring receiving grooves are coaxially arranged. The receiving platform 4 has, in its travel stroke, each picking position that aligns the ring receiving groove with the material dropping clearance opening, and a feeding position that aligns the receiving structure with the feeding area. The material transfer mechanism is a robotic arm, which can move a set of outer and inner rings to the corresponding welding station at one time.

[0023] The main platform 1 is a flat plate structure fixed to the main frame 2. The main platform 1 has a large circular clearance hole 11, a small circular clearance hole 12, and a feeding clearance hole 13 that run vertically through the platform. The large circular clearance hole 11 and the small circular clearance hole 12 respectively form a discharge clearance opening for the large circular clearance hole 100 and a discharge clearance opening for the small circular clearance hole 200. The diameter of the large circular clearance hole 11 is slightly larger than the diameter of the large circular clearance hole 100, and the diameter of the small circular clearance hole 12 is slightly larger than the diameter of the small circular clearance hole 200. The large circular clearance hole 11, the small circular clearance hole 12, and the feeding clearance hole 13 are distributed at intervals along the left-right direction, and the center lines of each clearance hole are coplanar. The small circular clearance hole 12 is located between the large circular clearance hole 11 and the feeding clearance hole 13, forming a discharge clearance opening close to the feeding area, while the large circular clearance hole 11 forms a discharge clearance opening away from the feeding area. The area where the loading clearance hole 13 is located is the loading area. The diameter of the loading clearance hole 13 is slightly larger than the diameter of the large circle 100 so that both the large circle 100 and the small circle 200 on the receiving platform 4 can be exposed through the loading clearance hole 13.

[0024] A drive mechanism located below the main platform 1 is mounted on the frame. This drive mechanism drives the receiving platform 4 to reciprocate linearly in the left-right direction. The gap between the upper side of the receiving platform 4 and the lower side of the main platform 1 is very small. The upper side of the receiving platform 4 is provided with a small ring receiving groove 41 and a large ring receiving groove 42. The small ring receiving groove 41 is an annular groove adapted to the small ring 200, and the large ring receiving groove 42 is an annular groove adapted to the large ring 100. The small ring receiving groove 41 and the large ring receiving groove 42 are arranged coaxially to position the small ring 200 and the large ring 100. When the small ring receiving groove 41 and the small ring clearance hole 12 are not vertically aligned, the receiving platform 4 can block the small ring clearance hole 12 to prevent the small ring 200 from falling out. When the large ring receiving groove 42 and the large ring clearance hole 11 are not vertically aligned, the receiving platform 4 can block the large ring clearance hole 11 to prevent the large ring 100 from falling out. The portion of the receiving platform 4 located outside the large-circle receiving groove 42 and the portion located outside the small-circle receiving groove 41 are used to form a shielding part to block the material drop clearance opening that is offset from the receiving structure when the receiving platform 4 moves to the corresponding position.

[0025] The specific structure of the receiving platform and the specific structure of the drive mechanism used to drive the reciprocating movement of the receiving platform can be found in the patent documents cited in the background section, and will not be repeated here.

[0026] The following combination Figure 4 , Figure 5 , Figure 6 , Figure 7The material storage mechanism of the ring feeding device is described below. The material storage mechanism 3 includes a limiting core and a core fixing structure. The limiting core constitutes the ring limiting structure. Since this embodiment needs to simultaneously feed both large rings 100 and small rings 200, there are two types of limiting cores: a large ring limiting core 31 and a small ring limiting core 32. The limiting core is provided for the rings to be fitted together to limit the stacked rings. The bottom of the core fixing structure is fixed to the main platform 1, and the top of the limiting core is fixed to the core fixing structure and extends downward based on the top of the core fixing structure. During feeding, the rings can fall along the limiting core through the corresponding dropping clearance opening to the receiving structure. The limiting core meets the requirement of clearance fit with the rings, and the maximum gap between the limiting core and the rings is less than the wire diameter of the rings. The maximum gap between the limiting core and the rings is also the maximum gap that can be generated by the radial offset of the rings relative to the limiting core. The wire diameter of the ring body is also the diameter of the cross-section of the ring body. In this embodiment, the ring body is formed by bending steel wire into a circle and then welding the two ends together. The wire diameter is equal to the diameter of the steel wire.

[0027] Using a limiting core, the rings are limited from the inside out. The rings are stacked on top of the limiting core, one on top of the other. During loading, the rings fall along the limiting core, pass through the material discharge opening on the main platform 1, and enter the corresponding receiving structure on the receiving platform 4. Due to the clearance fit between the limiting core and the rings, the rings can fall autonomously under their own weight. Simultaneously, the maximum gap between the limiting core and the rings must be less than the ring's wire diameter. This ensures that if misalignment occurs between the rings due to the gap between them, the smaller gap, and the smaller distance between adjacent rings, will prevent misalignment. In the ring body, when the upper ring body is under greater pressure and its misaligned portion relative to the lower ring body presses against the gap between the lower ring body and the limiting core, the misaligned portion of the lower ring body is subjected to an outward expansion force rather than an inward contraction force. The ring body has strong resistance to deformation under outward expansion force, and the limiting core can restrict the deformation of the ring body. Therefore, the upper ring body is not easy to squeeze into the gap between the lower ring body and the limiting core, thus it is not easy to get stuck due to misalignment. Moreover, when placing the ring body, the ring body automatically straightens itself on the limiting core, and it is not easy to tilt. This helps to avoid jamming during material feeding due to improper ring body posture.

[0028] The large-circle limiting core 31 includes three or more limiting rods 311 distributed circumferentially. In this embodiment, there are three. When in use, the ring is fitted around the outer space of the area enclosed by each limiting rod 311. Each limiting rod 311 passes through each large ring 100 in the stack. The multiple limiting rods 311 form a frame structure, reducing weight, facilitating manufacturing, and ensuring reliable limiting. In other embodiments, the large-circle limiting core can also be a cylinder, with the large ring fitted around the cylinder.

[0029] The large-circle limiting core 31 includes a lower fixing body fixed to the lower end of each limiting rod 311 and an upper fixing body fixed to the lower end of each limiting rod 311, thus fixing and constraining each limiting rod 311, resulting in structural stability. In other embodiments, only the upper fixing body or only the lower fixing body may be provided, provided that the limiting rods have sufficient rigidity.

[0030] In this embodiment, the upper fixing body is a fixing disk 312, which is a disc, and the lower fixing body is a fixing ring 313, which is a ring. The disc has multiple through holes around its center line, and the ring has a larger central hole to reduce weight. The lower ends of each limiting rod 311 are fixed to the outer edge of the fixing ring 313, and the upper ends of each limiting rod 311 are fixed to the outer edge of the fixing disk 312. The fixing ring 313 and the fixing disk 312 are coaxial, ensuring the position of each limiting rod 311. In other embodiments, the upper and lower fixing bodies can also be solid circular plates.

[0031] The small-circle limiting core 32 is a cylinder with an outer circumferential surface. Since the inner diameter of the small-circle 200 is small, the cylinder is a solid cylinder with a diameter slightly smaller than the inner diameter of the small-circle 200 to facilitate smooth movement of the small-circle 200 relative to the cylinder. In other embodiments, the small-circle limiting core 32 can also be a cylindrical structure or a mesh cylinder, or it can be a frame structure similar to that of the large-circle limiting core.

[0032] In this embodiment, two types of limiting cores are provided: a large-circle limiting core 31 and a small-circle limiting core 32, to store two different sizes of rings, allowing the feeding device to feed two rings at a time. In other embodiments, only the large-circle limiting core or only the small-circle limiting core can be provided as needed; if there are more types of rings, additional limiting cores can be added.

[0033] The core fixing structure includes a fixed column 33 and a top bracket 34, arranged vertically (top-bottom direction), with the lower end corresponding to the bottom and the upper end corresponding to the top. A fixing plate 312 forms the upper end of the large-circle limiting core 31, and a fixing ring 313 forms the lower end of the large-circle limiting core 31. The bottom of the fixed column 33 is fixed to the main platform 1 and is detachably fixed with bolts. The top bracket 34 is installed on top of the fixed column 33, and the top of the limiting core is detachably connected to the top bracket 34, facilitating individual replacement of the limiting core. In other embodiments, the top of the limiting core can also be welded and fixed to the top bracket; when reloading is required, the entire core fixing structure can be removed from the main platform.

[0034] There are two fixed posts 33, which are fixed on the radial sides of the large circle clearance hole 11, respectively. One of the fixed posts 33 and the small circle clearance hole 12 are on the same side of the large circle clearance hole 11. The top bracket 34 extends laterally and is arranged perpendicular to the vertical direction. The two ends of the extension direction are respectively connected to the top of the two fixed posts 33. The top bracket 34 forms a crossbeam for suspending the limiting core. The center of the fixing plate 312 of the large circle limiting core 31 is fixedly connected to the middle of the top bracket 34 by bolts. The top of the small circle limiting core 32 has a threaded hole for fixed connection to the end of the top bracket 34 by bolts. This ensures that both the small circle limiting core 32 and the large circle limiting core 31 are suspended on the top bracket 34, without interfering with the free fall of the ring.

[0035] One end of the top bracket 34 is hinged to the top of one of the fixed columns 33, and the other end is detachably fixed to the top of the other fixed column 33. When it is necessary to reassemble the ring body, the limiting core can be first separated from the top bracket 34, and then one end of the top bracket 34 can be removed to flip it open and remove the limiting core. In other embodiments, both ends of the top bracket can be detachably fixed to both fixed columns, and the top bracket can be removed individually.

[0036] The detachable fixed connection between the top bracket 34 and the fixed column 33, and the detachable fixed connection between the limiting core and the top bracket 34, both use bolts with lifting eyelets to facilitate screwing operations from above the top bracket 34.

[0037] The large-ring limiting core 31 and the large-ring clearance hole 11 are vertically aligned, and the small-ring limiting core 32 and the small-ring clearance hole 12 are vertically aligned. The lower end of the limiting core extends into the material discharge clearance opening and does not contact the receiving platform 4 during material feeding. That is, the lower end of the cylinder of the small-ring limiting core 32 extends into the small-ring clearance hole 12, and the ring of the large-ring limiting core 31 extends into the large-ring clearance hole 11, which helps guide the ring to smoothly enter the corresponding receiving groove. In other embodiments, the lower surface of the limiting core can also be slightly higher than the upper surface of the main platform.

[0038] Both the upper and lower ends of the limiting core are designed to accommodate the ring body, allowing it to be fitted onto either the upper or lower end of the limiting core. This facilitates material loading, which can be done separately. After loading, the entire assembly is then placed onto the feeding device. The upper and lower end faces of the limiting rod 311 connect to the lower side of the disc and the upper side of the ring, respectively. The diameter of the fixing disc 312 and the outer diameter of the fixing ring 313 are both smaller than the inner diameter of the large ring 100. When installing the limiting core and the ring body onto the feeding device, a limiting pin can be installed at the bottom of the limiting core to prevent the ring body from falling off. After installation, the limiting pin can be removed.

[0039] To facilitate the loading of the large 100mm and small 200mm rings, the top bracket 34 suspending the two limiting cores is designed to be flip-up and detachable. During loading, first loosen the lifting eye bolts securing the two limiting cores, then remove the lifting eye bolts securing the top bracket 34. Flip the top bracket 34 open, and after loading a sufficient quantity of rings, press the top bracket 34 back on while simultaneously tightening the lifting eye bolts. Gradually tighten the bolts to lift the two limiting cores slightly off the upper surface of the receiving platform 4, ensuring they do not rub against each other. The limiting cores can be disassembled and replaced. Before use, stack the small and large rings on the limiting cores. When replacement is needed, simply unscrew the corresponding bolts on the storage mechanism, open the top bracket, and directly replace the filled limiting core.

[0040] The two limiting cores can reduce the misalignment of the large and small rings and ensure that the misalignment of the large and small rings remains unchanged during the downward movement, ensuring that the ring is accurately placed and does not jam. In practical applications, the problem of material jamming no longer occurs, and the stability of the feeding device is improved.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ring-shaped feeding device, characterized in that, The system includes a frame, a main platform, a storage mechanism, a movably mounted receiving platform on the underside of the main platform, a receiving structure on the receiving platform, a drop clearance opening on the main platform, and a shielding part on the receiving platform to shield the drop clearance opening when it is misaligned with the receiving structure. The storage mechanism includes a limiting core and a core fixing structure. The limiting core is fitted with a ring body to limit the stacked ring body. The bottom of the core fixing structure is fixed to the main platform, and the top of the limiting core is fixed to the core fixing structure and extends downward so that the ring body can fall through the limiting core and the drop clearance opening to the receiving structure. The limiting core meets the requirement of clearance fit with the ring body, and the maximum clearance between the limiting core and the ring body is less than the wire diameter of the ring body.

2. The ring feeding device according to claim 1, characterized in that, The limiting core includes three or more limiting rods distributed circumferentially. When in use, the ring is fitted around the outer space of the area enclosed by each limiting rod.

3. The ring feeding device according to claim 2, characterized in that, The limiting core includes a lower fixing body fixed to the lower end of each limiting rod and / or an upper fixing body fixed to the lower end of each limiting rod.

4. The ring feeding device according to claim 3, characterized in that, The upper fixed body is a disc with multiple through holes around its center line. The upper ends of each limiting rod are fixed to the outer edge of the disc. The lower fixed body is a ring with the lower ends of each limiting rod fixed to the outer edge of the ring.

5. The ring feeding device according to claim 1, characterized in that, The limiting core is a cylinder with an outer peripheral surface.

6. The ring feeding device according to claim 1, characterized in that, There are at least two types of limiting cores, namely a large-circle limiting core and a small-circle limiting core. The large-circle limiting core includes three or more limiting rods distributed circumferentially, and the ring is fitted around the outer space of the area enclosed by each limiting rod when in use. The small-circle limiting core is a column with an outer circumferential surface. The main platform is provided with a material drop clearance opening corresponding to each limiting core. The receiving structure has ring receiving slots that are adapted to receive the corresponding rings and correspond to each material drop clearance opening. The receiving platform has a material picking position that corresponds to each ring receiving slot and the material drop clearance opening during its movement stroke, as well as a loading position that allows the receiving structure to expose the rings from the main platform.

7. The ring feeding device according to any one of claims 1-6, characterized in that, The core fixing structure includes a fixed column and a top bracket. The bottom of the fixed column is fixed to the main platform, and the top bracket is installed on the top of the fixed column. The top of the limiting core is detachably connected to the top bracket.

8. The ring feeding device according to claim 7, characterized in that, The fixed column and the top bracket can be detachably and fixedly connected; or there are two fixed columns, one end of the top bracket is hinged to the top of one of the fixed columns, and the other end is detachably and fixedly connected to the top of the other fixed column.

9. The ring feeding device according to any one of claims 1-6, characterized in that, The lower end of the limiting core extends into the material discharge clearance opening and does not contact the receiving table during material feeding.

10. The ring feeding device according to any one of claims 1-6, characterized in that, The upper and lower ends of the limiting core are both designed to allow the supply ring to be fitted onto the corresponding end.

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