Rubber ring forming device

Abstract

The utility model belongs to the technical field of battery forming, and particularly relates to a rubber ring forming device which comprises a punching lower die and a punching upper die, and the punching lower die is used for loading rubber sheets to be processed; the upper punching die is arranged above the lower punching die, and the moving path of the output end of the upper punching die passes through the lower punching die; wherein the punching upper die comprises an elastic limiting mechanism and a double-ring tool bit, the elastic end of the elastic limiting mechanism is used for elastically abutting against, limiting and fixing a rubber sheet located on the punching lower die, and an annular inserting groove with an opening back to the punching lower die is formed in the end, away from the elastic end of the elastic limiting mechanism, of the elastic limiting mechanism in a penetrating mode; the double-ring tool bit is detachably and concentrically inserted into the annular inserting groove, the double-ring tool bit is rapidly assembled and disassembled through the inserting groove, synchronous machining is completed through single-time clamping, and the equipment adjusting time is greatly shortened.

Description

Rubber ring forming device Technical Field

[0001] This utility model belongs to the field of battery molding technology, and in particular relates to a rubber ring molding device. Background Technology

[0002] In the traditional processing of the double-ring structure of button cell battery rubber rings, existing technologies typically employ a step-by-step punching process. Specifically, two sets of concentric annular cutters are installed on a stamping machine in two separate steps, and the outer and inner rings of the rubber ring are cut by stamping sequentially. Because the double-ring structure of the rubber ring requires ensuring concentricity and dimensional matching between the inner and outer rings, the cutter positions must be repeatedly adjusted and fixed during processing, relying on manual or semi-automated operation for mold alignment. While this process can achieve the formation of the double-ring structure, it requires two cutter assembly / disassembly and positioning operations within a single processing cycle, resulting in complex process connections and high precision requirements for equipment operation.

[0003] However, the above process has significant technical drawbacks. Since the two sets of annular cutter heads cannot complete synchronous processing in a single setup, the repeated disassembly and repositioning not only prolongs the production cycle but also easily leads to cutter head misalignment due to human error, affecting the consistency of the rubber ring molding quality. Simultaneously, frequent mold disassembly and reassembly exacerbates equipment wear, increases maintenance frequency, and further restricts production efficiency. Furthermore, the accumulated downtime for mold changes creates a bottleneck for capacity in large-scale production scenarios, necessitating process optimization to reduce unnecessary process interruptions. Summary of the Invention

[0004] The purpose of this invention is to provide a rubber ring forming device, which aims to solve the technical problem in the existing double-ring rubber ring punching equipment that the two sets of ring cutters cannot complete synchronous processing in one clamping. The repeated disassembly and positioning process not only prolongs the production cycle, but also easily causes the cutter head alignment deviation due to human operation error, affecting the consistency of rubber ring forming quality.

[0005] To achieve the above objectives, this utility model provides a rubber ring forming device, including a lower punching die and an upper punching die. The lower punching die is used to load the rubber sheet to be processed. The upper punching die is disposed above the lower punching die, and the output end of the upper punching die moves through the lower punching die. The upper punching die includes an elastic limiting mechanism and a double-ring cutter head. The elastic end of the elastic limiting mechanism is used to elastically abut against and limit the rubber sheet located on the lower punching die. The end of the elastic limiting mechanism away from its elastic end is provided with an annular insertion groove with an opening facing away from the lower punching die. The double-ring cutter head is detachably and concentrically inserted into the annular insertion groove, and the double-ring cutter head can slide relative to the elastic end of the elastic limiting mechanism. During the movement of the upper punching die towards the rubber sheet to be processed, the elastic end of the elastic limiting mechanism first contacts the double-ring cutter head and the rubber sheet to be processed.

[0006] Optionally, the elastic limiting mechanism includes a fixed base, an elastic component, and a movable base. The movable base is slidably connected to the fixed base via the elastic component. The annular insertion groove passes through the fixed base and the movable base. The elastic component always drives the movable base to move away from the fixed base. One end of the double-ring cutter head is detachably inserted into the fixed base, and the other end of the double-ring cutter head extends to the movable base. When the movable base abuts against the rubber sheet to be processed and overcomes the elastic force of the elastic component, moving towards the fixed base, the end of the double-ring cutter head extends outside the movable base.

[0007] Optionally, the annular insertion groove includes a first sliding groove and a second sliding groove. The first sliding groove is formed on the fixed base and passes through the fixed base. The second sliding groove is formed through the movable base. Both the first sliding groove and the second sliding groove are arranged in a concentric annular structure with equal diameter.

[0008] Optionally, the double-ring cutter head includes a connecting seat and a punching blade ring. The punching blade ring is detachably connected to one end of the connecting seat, and the other end of the connecting seat is detachably locked to the end of the fixed seat away from the movable seat. The end of the punching blade ring away from the connecting seat passes through the fixed seat and into the movable seat in sequence through the annular insertion groove.

[0009] Optionally, the punching blade ring includes a connecting part, an inner blade ring, and an outer blade ring. The inner blade ring and the outer blade ring are arranged in a concentric sleeve structure. The ends of the inner blade ring and the outer blade ring near the moving seat are provided with blade tips. The connecting part is fixedly connected to the ends of the inner blade ring and the outer blade ring away from the blade tips. A forming groove with the same thickness as the preset rubber ring to be formed is provided between the inner blade ring and the outer blade ring. The connecting part is detachably connected to the connecting seat.

[0010] Optionally, the connecting seat includes a locking plate, an elastic pusher portion, and an extension portion. The locking plate is detachably locked onto the fixed seat. The extension portion protrudes from the locking plate and can extend into the annular insertion groove. One end of the elastic pusher portion is detachably connected to the extension portion, and the other end of the elastic pusher portion extends into the forming groove. The output end of the elastic pusher portion can extend outside the forming groove. When the upper punching die moves towards the rubber sheet, the output end of the elastic pusher portion contacts the rubber sheet before the inner and outer blade rings.

[0011] Optionally, the elastic pushing part includes a pushing slide shaft, an abutment seat, and a pushing slider. One end of the pushing slide shaft is threadedly connected to the extension, and the other end of the pushing slide shaft is fixedly connected to the abutment seat. A pushing groove is provided in the abutment seat. One end of the pushing slider is slidably connected in the pushing groove, and the other end of the pushing slider is located outside the abutment seat. Both the end of the abutment seat near the pushing slide shaft and the end of the pushing slider are provided with pushing magnetic elements. The ends of the two sets of pushing magnetic elements opposite each other have the same magnetic poles.

[0012] Optionally, the elastic component includes a first magnetic element, a second magnetic element, a limiting slide shaft, and a limiting slider. The fixed base is provided with a limiting slide groove, and the limiting slider is slidably connected in the limiting slide groove. One end of the limiting slide shaft is fixedly connected to the limiting slider, and the other end of the limiting slide shaft extends outside the limiting slide groove and is fixedly connected to the movable base. The first magnetic element is disposed in the fixed base and located on one side of the limiting slide groove, and the second magnetic element is disposed in the limiting slider. The ends of the first magnetic element and the second magnetic element that are opposite to each other have the same magnetic poles.

[0013] Optionally, the fixed seat includes a first main body and a first outer ring. The first main body is arranged in a columnar structure, and the first outer ring is concentrically arranged with the first main body. The annular insertion groove is formed between the first main body and the first outer ring. The movable seat includes a second main body and a second outer ring. The second main body is arranged in a columnar structure, and the second outer ring is concentrically arranged with the second main body. The annular insertion groove is formed between the second main body and the second outer ring. The number of elastic components is at least three sets. The first main body and the second main body are slidably connected by the elastic components, and the first outer ring and the second outer ring are slidably connected by the elastic components.

[0014] Optionally, the number of elastic components is four sets, with two sets of elastic components connected between the first body and the second body, and two sets of elastic components connected between the first outer ring and the second outer ring.

[0015] The above-mentioned technical solutions of one or more of the rubber ring forming devices provided in this utility model embodiment have at least one of the following technical effects: The synergistic effect of the integrated double-ring cutter head and the elastic limiting mechanism significantly improves processing efficiency: During the punching process, when the upper punching die moves downward, the elastic limiting mechanism first presses the rubber sheet to achieve stable positioning. Subsequently, the double-ring cutter head slides along the annular insertion groove to synchronously complete the one-time cutting of the inner and outer double rings. This timing control effectively suppresses material displacement and deformation. Compared with the traditional step-by-step processing process, this solution completely eliminates the process of repeatedly disassembling and assembling the cutter head—the double-ring cutter head achieves rapid assembly and disassembly through the insertion groove, completing synchronous processing in a single clamping, significantly shortening equipment adjustment time; the concentric fit structure of the insertion groove avoids manual alignment errors, ensuring precise matching of the inner and outer ring cutting positions; reducing the frequency of mold disassembly and assembly reduces mechanical wear on the equipment, while the elastic limiting mechanism buffers the punching impact to extend the cutter head life; the separation control of elastic clamping and cutting actions makes the cut edge smoother and significantly improves dimensional consistency. This innovative design fundamentally solves the efficiency bottleneck and maintenance burden caused by multiple disassemblies and assemblies in traditional processes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a schematic diagram of the structure of the rubber ring forming device provided in the embodiment of this utility model.

[0018] Figure 2 is a schematic diagram of the action of the double-ring cutter head of the rubber ring forming device in Figure 1 extending out of the moving seat.

[0019] Figure 3 is a cross-sectional schematic diagram of the rubber ring forming device provided in the embodiment of this utility model.

[0020] Figure 4 is an exploded view of the rubber ring forming device in Figure 3.

[0021] Figure 5 is a bottom view of the double-ring cutter head provided in the embodiment of this utility model.

[0022] The following are the labeling elements in the figure:

[0023] 100—Elastic limiting mechanism; 200—Double ring cutter head; 300—Annular insertion groove

[0024] 110—Fixed base; 120—Elastic component; 130—Moving base

[0025] 310—First slide rail; 320—Second slide rail; 210—Connecting seat

[0026] 220—Punching blade ring; 221—Connecting part; 222—Inner blade ring

[0027] 223—Outer blade ring; 211—Locking plate; 212—Elastic pusher section

[0028] 213—Extension section; 224—Forming groove; 215—Pushing slide shaft

[0029] 216—Abutment seat; 217—Pusher slider; 218—Pusher chute

[0030] 121—First magnetic component; 122—Second magnetic component; 123—Limiting slide shaft

[0031] 124—Limiting slider; 125—Limiting groove; 111—First main body

[0032] 112—First Outer Ring; 131—Second Main Body; 132—Second Outer Ring

[0033] 219—Magnetic pusher component. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to Figures 1-5 are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0038] In one embodiment of this utility model, as shown in Figures 1-5, a rubber ring forming device is provided, including a lower punching die and an upper punching die. The lower punching die is used to load the rubber sheet to be processed. The upper punching die is disposed above the lower punching die, and the output end of the upper punching die moves through the lower punching die. The upper punching die includes an elastic limiting mechanism 100 and a double-ring cutter head 200. The elastic end of the elastic limiting mechanism 100 is used to elastically abut against and limit the lower punching die. The rubber sheet has an annular insertion groove 300 with an opening facing away from the lower punching die, which is provided on the end of the elastic limiting mechanism 100 away from its elastic end. The double-ring cutter head 200 is detachably and concentrically inserted into the annular insertion groove 300. The double-ring cutter head 200 can slide relative to the elastic end of the elastic limiting mechanism 100. During the movement of the upper punching die toward the rubber sheet to be processed, the elastic end of the elastic limiting mechanism 100 first contacts the double-ring cutter head 200 and the rubber sheet to be processed.

[0039] The synergistic effect of the integrated double-ring cutter head 200 and the elastic limiting mechanism 100 significantly improves processing efficiency: During the punching process, when the upper die moves downward, the elastic limiting mechanism 100 first presses the rubber sheet to achieve stable positioning. Subsequently, the double-ring cutter head 200 slides along the annular insertion groove 300 to simultaneously complete the one-time cutting of the inner and outer double rings. This timing control effectively suppresses material displacement and deformation. Compared with the traditional step-by-step processing process, this solution completely eliminates the process of repeatedly disassembling and assembling the cutter head—the double-ring cutter head 200 achieves rapid assembly and disassembly through the insertion groove, and synchronous processing is completed in a single clamping, greatly shortening the equipment adjustment time; the concentric fit structure of the insertion groove avoids manual alignment errors and ensures accurate matching of the inner and outer ring cutting positions; reducing the frequency of die disassembly and assembly can reduce mechanical wear of the equipment, while the elastic limiting mechanism 100 buffers the punching impact to extend the life of the cutter head; the separation control of elastic clamping and cutting action makes the cut edge smoother and significantly improves dimensional consistency. This innovative design fundamentally solves the efficiency bottleneck and maintenance burden caused by multiple disassemblies and assemblies in traditional processes.

[0040] As shown in Figures 1-5, in another embodiment of this utility model, the elastic limiting mechanism 100 includes a fixed base 110, an elastic component 120, and a movable base 130. The movable base 130 is slidably connected to the fixed base 110 through the elastic component 120. The annular insertion groove 300 is disposed through the fixed base 110 and the movable base 130. The elastic component 120 always drives the movable base 130 to move away from the fixed base 110. One end of the double-ring cutter head 200 is detachably inserted into the fixed base 110, and the other end of the double-ring cutter head 200 extends to the movable base 130. When the movable base 130 abuts against the rubber sheet to be processed and overcomes the elastic force of the elastic component 120, moving towards the fixed base 110, the end of the double-ring cutter head 200 extends outside the movable base 130. When the upper die moves downward, the movable seat 130 first contacts the rubber sheet and retracts under pressure, compressing the elastic component 120. When the movable seat 130 retracts to the set position, the double-ring cutter head 200 extends from the movable seat 130 and cuts into the material. This sliding mechanism ensures that the cutter head only triggers cutting after the material is fully compressed, completely solving the problem of cut deformation caused by insufficient material pre-compression in traditional processes. At the same time, the automatic reset function of the elastic component 120 avoids manual intervention in the reset step, reducing equipment downtime caused by reset errors in traditional step-by-step processing.

[0041] As shown in Figures 1-5, in another embodiment of this utility model, the annular insertion groove 300 includes a first sliding groove 310 and a second sliding groove 320. The first sliding groove 310 is formed on the fixed base 110 and penetrates through the fixed base 110. The second sliding groove 320 is formed through the movable base 130. Both the first sliding groove 310 and the second sliding groove 320 are arranged in a concentric annular structure with equal diameter. After the double-ring cutter head 200 is inserted into the first sliding groove 310 of the fixed base 110, it always maintains concentric guidance within the second sliding groove 320 when sliding with the movable base 130. The split sliding groove design ensures that the cutter head always maintains axial concentricity during dynamic cutting, eliminating the cumulative error caused by repeated alignment in traditional multiple clamping, and ensuring the positional accuracy and coaxiality consistency of the double-ring cut.

[0042] As shown in Figures 1-5, in another embodiment of this utility model, the double-ring cutter head 200 includes a connecting seat 210 and a punching cutter ring 220. The punching cutter ring 220 is detachably connected to one end of the connecting seat 210, and the other end of the connecting seat 210 is detachably locked to the end of the fixed seat 110 away from the movable seat 130. The end of the punching cutter ring 220 away from the connecting seat 210 passes through the annular insertion groove 300 sequentially through the fixed seat 110 and into the movable seat 130. The connecting seat 210 is fixed to the top of the fixed seat 110, and the punching cutter ring 220 extends through the insertion groove into the interior of the movable seat 130. The cutter ring and the connecting seat 210 are disassembled and assembled via a quick interface. The modular cutter head design enables independent replacement of the cutter ring, solving the maintenance cost problem of having to scrap the entire set after the traditional integral mold is damaged. The disassembly and assembly of the cutter head only requires operating the locking mechanism of the connecting seat 210, greatly reducing the time spent disassembling multiple sets of cutter heads in the traditional process.

[0043] As shown in Figures 1-5, in another embodiment of this utility model, the punching blade ring 220 includes a connecting part 221, an inner blade ring 222, and an outer blade ring 223. The inner blade ring 222 and the outer blade ring 223 are arranged in a concentric sleeve structure. Blade tips are provided at the ends of the inner blade ring 222 and the outer blade ring 223 near the moving seat 130. The connecting part 221 is fixedly connected to the ends of the inner blade ring 222 and the outer blade ring 223 away from the blade tips. A forming groove 224 with a thickness equal to the preset rubber ring to be formed is provided between the inner blade ring 222 and the outer blade ring 223. The connecting part 221 is detachably connected to the connecting seat 210. When the inner blade ring 222 and the outer blade ring 223 are pressed down synchronously, the forming groove 224 restricts the deformation space of the rubber sheet, and the blade tips simultaneously cut the inner and outer contours to form an annular rubber ring. The integrated double-ring cutter head 200 directly controls the thickness of the rubber ring through the forming groove 224, avoiding the uneven thickness problem caused by misalignment of two stamping operations in traditional step-by-step cutting. The synchronous cutting action eliminates the local elastic rebound of the material caused by single force, improving the perpendicularity of the cut.

[0044] As shown in Figures 1-5, in another embodiment of this utility model, the connecting seat 210 includes a locking plate 211, an elastic pusher part 212, and an extension part 213. The locking plate 211 is detachably locked onto the fixed seat 110. The extension part 213 protrudes from the locking plate 211 and can extend into the annular insertion groove 300. One end of the elastic pusher part 212 is detachably connected to the extension part 213, and the other end of the elastic pusher part 212 extends into the forming groove 224. The output end of the elastic pusher part 212 can extend outside the forming groove 224. When the upper punching die moves towards the rubber sheet, the output end of the elastic pusher part 212 contacts the rubber sheet before the inner blade ring 222 and the outer blade ring 223.

[0045] In the initial stage of stamping, the elastic pusher 212 first contacts the material and retracts until the blade ring cuts in; after cutting, the elastic pusher 212 automatically ejects the waste material from the rubber ring. The pusher's pre-contact with the material forms a local pre-compression zone, reducing the instantaneous impact deformation when the blade tip cuts in. The automatic ejection function avoids equipment downtime caused by traditional manual material removal, significantly improving continuous operation efficiency.

[0046] As shown in Figures 1-5, in another embodiment of this utility model, the elastic pushing part 212 includes a pushing slide shaft 215, an abutment seat 216, and a pushing slider 217. One end of the pushing slide shaft 215 is threadedly connected to the extension 213, and the other end of the pushing slide shaft 215 is fixedly connected to the abutment seat 216. A pushing groove 218 is provided in the abutment seat 216. One end of the pushing slider 217 is slidably connected in the pushing groove 218, and the other end of the pushing slider 217 is located outside the abutment seat 216. Both the end of the abutment seat 216 near the pushing slide shaft 215 and the end of the pushing slider 217 are provided with pushing magnetic elements 219. The ends of the two sets of pushing magnetic elements 219 are opposite each other and have the same magnetic poles. When the pushing slider 217 contacts the material, it is compressed and retracts, and the magnetic repulsion provides a buffer; after the pressure disappears, the magnetic repulsion pushes the slider back to its original position to push the material. Magnetic buffers replace traditional mechanical springs, preventing metal fatigue failure and solving the problem of short lifespan of the feeding mechanism under long-term high-frequency stamping. Non-contact magnetic drive reduces friction loss and extends maintenance cycles.

[0047] As shown in Figures 1-5, in another embodiment of this utility model, the elastic component 120 includes a first magnetic element 121, a second magnetic element 122, a limiting slide shaft 123, and a limiting slider 124. The fixed base 110 is provided with a limiting slide groove 125. The limiting slider 124 is slidably connected in the limiting slide groove 125. One end of the limiting slide shaft 123 is fixedly connected to the limiting slider 124, and the other end of the limiting slide shaft 123 extends outside the limiting slide groove 125 and is fixedly connected to the movable base 130. The first magnetic element 121 is disposed in the fixed base 110 and located on one side of the limiting slide groove 125. The second magnetic element 122 is disposed in the limiting slider 124. The ends of the first magnetic element 121 and the second magnetic element 122 that are opposite to each other have the same magnetic poles. When the movable seat 130 is pressed down, the limiting slider 124 slides along the groove. The magnetic repulsion between the first and second magnetic components 122 increases as the distance decreases, forming a non-linear buffer. The magnetic repulsion buffer replaces traditional rubber or spring components, eliminating the risk of elastic failure caused by material aging. The distance-sensitive damping characteristic effectively absorbs the peak impact force of punching and reduces equipment vibration and noise caused by traditional rigid collisions.

[0048] As shown in Figures 1-5, in another embodiment of this utility model, the fixed base 110 includes a first main body 111 and a first outer ring 112. The first main body 111 is cylindrical, and the first outer ring 112 is concentrically arranged with the first main body 111. The annular insertion groove 300 is formed between the first main body 111 and the first outer ring 112. The movable base 130 includes a second main body 131 and a second outer ring 132. The second main body 131 is cylindrical, and the second outer ring 132 is concentrically arranged with the second main body 131. The annular insertion groove 300 is formed between the second main body 131 and the second outer ring 132. The number of elastic components 120 is at least three sets. The first main body 111 and the second main body 131 are slidably connected by the elastic components 120, and the first outer ring 112 and the second outer ring 132 are slidably connected by the elastic components 120. The main body and the outer ring are independently connected by multiple sets of elastic components 120. When the movable base 130 is pressed down, the main body and the outer ring slide synchronously but are separated by force. The dual-rail sliding structure avoids the off-center loading and jamming problem of traditional single-axis guides, especially solving the concentricity misalignment caused by uneven force during large-area cutting. Multiple sets of elastic components distribute the load 120°, extending the life of individual components.

[0049] As shown in Figures 1-5, in another embodiment of this utility model, the number of elastic components 120 is four sets. Two sets of elastic components 120 are connected between the first main body 111 and the second main body 131, and two sets of elastic components 120 are connected between the first outer ring 112 and the second outer ring 132. The four sets of magnetic elastic components 120 are symmetrically arranged, with two independent buffer units allocated to each of the main body and the outer ring. Four-point support achieves statically indeterminate positioning, completely eliminating the risk of tilting of the moving seat 130. Compared with traditional single-point or two-point support, this structure maintains the vertical movement trajectory of the cutter head under high-speed continuous stamping, solving the problem of excessive ellipticity of the rubber ring caused by skewed cutting.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rubber ring forming device, characterized in that, include: A lower punching die is used to load the rubber sheet to be processed; an upper punching die is disposed above the lower punching die, and the output end of the upper punching die moves through the lower punching die; wherein, the upper punching die includes an elastic limiting mechanism and a double-ring cutter head, the elastic end of the elastic limiting mechanism is used to elastically abut against and limit the rubber sheet located on the lower punching die, and the end of the elastic limiting mechanism away from its elastic end is provided with an annular insertion groove with an opening facing away from the lower punching die, the double-ring cutter head is detachably concentrically inserted into the annular insertion groove, and the double-ring cutter head can slide relative to the elastic end of the elastic limiting mechanism; during the movement of the upper punching die toward the rubber sheet to be processed, the elastic end of the elastic limiting mechanism first contacts the double-ring cutter head and the rubber sheet to be processed.

2. The rubber ring forming device according to claim 1, characterized in that: The elastic limiting mechanism includes a fixed base, an elastic component, and a movable base. The movable base is slidably connected to the fixed base via the elastic component. The annular insertion groove is disposed through the fixed base and the movable base. The elastic component always drives the movable base to move away from the fixed base. One end of the double-ring cutter head is detachably inserted into the fixed base, and the other end of the double-ring cutter head extends to the movable base. When the movable base abuts against the rubber sheet to be processed and overcomes the elastic force of the elastic component, moving towards the fixed base, the end of the double-ring cutter head extends outside the movable base.

3. The rubber ring forming device according to claim 2, characterized in that: The annular insertion groove includes a first sliding groove and a second sliding groove. The first sliding groove is formed on the fixed base and passes through the fixed base. The second sliding groove is formed on the movable base. Both the first sliding groove and the second sliding groove are arranged in a concentric annular structure with equal diameter.

4. The rubber ring forming device according to claim 2, characterized in that: The double-ring cutter head includes a connecting seat and a punching cutter ring. The punching cutter ring is detachably connected to one end of the connecting seat, and the other end of the connecting seat is detachably locked to the end of the fixed seat away from the movable seat. The end of the punching cutter ring away from the connecting seat passes through the fixed seat and enters the movable seat in sequence through the annular insertion groove.

5. The rubber ring forming device according to claim 4, characterized in that: The punching blade ring includes a connecting part, an inner blade ring, and an outer blade ring. The inner blade ring and the outer blade ring are arranged in a concentric sleeve structure. The ends of the inner blade ring and the outer blade ring near the moving seat are provided with blade tips. The connecting part is fixedly connected to the ends of the inner blade ring and the outer blade ring away from the blade tips. A forming groove with the same thickness as the preset rubber ring to be formed is provided between the inner blade ring and the outer blade ring. The connecting part is detachably connected to the connecting seat.

6. The rubber ring forming apparatus according to claim 5, characterized in that: The connecting seat includes a locking plate, an elastic pusher part, and an extension part. The locking plate is detachably locked onto the fixed seat. The extension part protrudes from the locking plate and can extend into the annular insertion groove. One end of the elastic pusher part is detachably connected to the extension part, and the other end of the elastic pusher part extends into the forming groove. The output end of the elastic pusher part can extend outside the forming groove. When the upper punching die moves towards the rubber sheet, the output end of the elastic pusher part contacts the rubber sheet before the inner and outer blade rings.

7. The rubber ring forming apparatus according to claim 6, characterized in that: The elastic pushing part includes a pushing slide shaft, an abutment seat, and a pushing slider. One end of the pushing slide shaft is threadedly connected to the extension, and the other end of the pushing slide shaft is fixedly connected to the abutment seat. A pushing groove is provided in the abutment seat. One end of the pushing slider is slidably connected in the pushing groove, and the other end of the pushing slider is located outside the abutment seat. Both the end of the abutment seat near the pushing slide shaft and the end of the pushing slider are provided with pushing magnetic elements. The ends of the two sets of pushing magnetic elements opposite each other have the same magnetic poles.

8. The rubber ring forming device according to claim 2, characterized in that: The elastic component includes a first magnetic element, a second magnetic element, a limiting slide shaft, and a limiting slider. The fixed base is provided with a limiting slide groove. The limiting slider is slidably connected in the limiting slide groove. One end of the limiting slide shaft is fixedly connected to the limiting slider, and the other end of the limiting slide shaft extends outside the limiting slide groove and is fixedly connected to the movable base. The first magnetic element is disposed in the fixed base and located on one side of the limiting slide groove. The second magnetic element is disposed in the limiting slider. The ends of the first magnetic element and the second magnetic element that are opposite to each other have the same magnetic poles.

9. The rubber ring forming apparatus according to claim 8, characterized in that: The fixed base includes a first main body and a first outer ring. The first main body is cylindrical, and the first outer ring is concentrically arranged with the first main body. The annular insertion groove is formed between the first main body and the first outer ring. The movable base includes a second main body and a second outer ring. The second main body is cylindrical, and the second outer ring is concentrically arranged with the second main body. The annular insertion groove is formed between the second main body and the second outer ring. The number of elastic components is at least three sets. The first main body and the second main body are slidably connected by the elastic components, and the first outer ring and the second outer ring are slidably connected by the elastic components.

10. The rubber ring forming apparatus according to claim 9, characterized in that: The number of elastic components is four sets, with two sets of elastic components connected between the first body and the second body, and two sets of elastic components connected between the first outer ring and the second outer ring.

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